// SPDX-License-Identifier: GPL-2.0-only
/*
 * BSS client mode implementation
 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
 * Copyright 2004, Instant802 Networks, Inc.
 * Copyright 2005, Devicescape Software, Inc.
 * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
 * Copyright 2013-2014  Intel Mobile Communications GmbH
 * Copyright (C) 2015 - 2017 Intel Deutschland GmbH
 * Copyright (C) 2018 - 2026 Intel Corporation
 */

#include <linux/delay.h>
#include <linux/fips.h>
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/moduleparam.h>
#include <linux/rtnetlink.h>
#include <linux/crc32.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <net/mac80211.h>
#include <linux/unaligned.h>

#include "ieee80211_i.h"
#include "driver-ops.h"
#include "rate.h"
#include "led.h"
#include "fils_aead.h"

#include <kunit/static_stub.h>

#define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
#define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
#define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
#define IEEE80211_AUTH_TIMEOUT_SAE      (HZ * 2)
#define IEEE80211_AUTH_MAX_TRIES        3
#define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
#define IEEE80211_AUTH_WAIT_SAE_RETRY   (HZ * 2)
#define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
#define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
#define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
#define IEEE80211_ASSOC_MAX_TRIES       3

#define IEEE80211_ADV_TTLM_SAFETY_BUFFER_MS (100 * USEC_PER_MSEC)
#define IEEE80211_ADV_TTLM_ST_UNDERFLOW 0xff00

#define IEEE80211_NEG_TTLM_REQ_TIMEOUT (HZ / 5)

static int max_nullfunc_tries = 2;
module_param(max_nullfunc_tries, int, 0644);
MODULE_PARM_DESC(max_nullfunc_tries,
                 "Maximum nullfunc tx tries before disconnecting (reason 4).");

static int max_probe_tries = 5;
module_param(max_probe_tries, int, 0644);
MODULE_PARM_DESC(max_probe_tries,
                 "Maximum probe tries before disconnecting (reason 4).");

/*
 * Beacon loss timeout is calculated as N frames times the
 * advertised beacon interval.  This may need to be somewhat
 * higher than what hardware might detect to account for
 * delays in the host processing frames. But since we also
 * probe on beacon miss before declaring the connection lost
 * default to what we want.
 */
static int beacon_loss_count = 7;
module_param(beacon_loss_count, int, 0644);
MODULE_PARM_DESC(beacon_loss_count,
                 "Number of beacon intervals before we decide beacon was lost.");

/*
 * Time the connection can be idle before we probe
 * it to see if we can still talk to the AP.
 */
#define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
/*
 * Time we wait for a probe response after sending
 * a probe request because of beacon loss or for
 * checking the connection still works.
 */
static int probe_wait_ms = 500;
module_param(probe_wait_ms, int, 0644);
MODULE_PARM_DESC(probe_wait_ms,
                 "Maximum time(ms) to wait for probe response"
                 " before disconnecting (reason 4).");

/*
 * How many Beacon frames need to have been used in average signal strength
 * before starting to indicate signal change events.
 */
#define IEEE80211_SIGNAL_AVE_MIN_COUNT  4

/*
 * We can have multiple work items (and connection probing)
 * scheduling this timer, but we need to take care to only
 * reschedule it when it should fire _earlier_ than it was
 * asked for before, or if it's not pending right now. This
 * function ensures that. Note that it then is required to
 * run this function for all timeouts after the first one
 * has happened -- the work that runs from this timer will
 * do that.
 */
static void run_again(struct ieee80211_sub_if_data *sdata,
                      unsigned long timeout)
{
        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        if (!timer_pending(&sdata->u.mgd.timer) ||
            time_before(timeout, sdata->u.mgd.timer.expires))
                mod_timer(&sdata->u.mgd.timer, timeout);
}

void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
{
        if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
                return;

        if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
                return;

        mod_timer(&sdata->u.mgd.bcn_mon_timer,
                  round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
}

void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

        if (unlikely(!ifmgd->associated))
                return;

        if (ifmgd->probe_send_count)
                ifmgd->probe_send_count = 0;

        if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
                return;

        mod_timer(&ifmgd->conn_mon_timer,
                  round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
}

static int ecw2cw(int ecw)
{
        return (1 << ecw) - 1;
}

static enum ieee80211_conn_mode
ieee80211_determine_ap_chan(struct ieee80211_sub_if_data *sdata,
                            struct ieee80211_channel *channel,
                            u32 vht_cap_info,
                            const struct ieee802_11_elems *elems,
                            bool ignore_ht_channel_mismatch,
                            const struct ieee80211_conn_settings *conn,
                            struct cfg80211_chan_def *chandef)
{
        const struct ieee80211_ht_operation *ht_oper = elems->ht_operation;
        const struct ieee80211_vht_operation *vht_oper = elems->vht_operation;
        const struct ieee80211_he_operation *he_oper = elems->he_operation;
        const struct ieee80211_eht_operation *eht_oper = elems->eht_operation;
        const struct ieee80211_uhr_operation *uhr_oper = elems->uhr_operation;
        struct ieee80211_supported_band *sband =
                sdata->local->hw.wiphy->bands[channel->band];
        struct cfg80211_chan_def vht_chandef;
        bool no_vht = false;
        u32 ht_cfreq;

        if (ieee80211_hw_check(&sdata->local->hw, STRICT))
                ignore_ht_channel_mismatch = false;

        *chandef = (struct cfg80211_chan_def) {
                .chan = channel,
                .width = NL80211_CHAN_WIDTH_20_NOHT,
                .center_freq1 = channel->center_freq,
                .freq1_offset = channel->freq_offset,
        };

        /* get special S1G case out of the way */
        if (sband->band == NL80211_BAND_S1GHZ) {
                if (!ieee80211_chandef_s1g_oper(sdata->local, elems->s1g_oper,
                                                chandef)) {
                        /* Fallback to default 1MHz */
                        chandef->width = NL80211_CHAN_WIDTH_1;
                        chandef->s1g_primary_2mhz = false;
                }

                return IEEE80211_CONN_MODE_S1G;
        }

        /* get special 6 GHz case out of the way */
        if (sband->band == NL80211_BAND_6GHZ) {
                enum ieee80211_conn_mode mode = IEEE80211_CONN_MODE_HIGHEST;

                /* this is an error */
                if (conn->mode < IEEE80211_CONN_MODE_HE)
                        return IEEE80211_CONN_MODE_LEGACY;

                if (!elems->he_6ghz_capa || !elems->he_cap) {
                        sdata_info(sdata,
                                   "HE 6 GHz AP is missing HE/HE 6 GHz band capability\n");
                        return IEEE80211_CONN_MODE_LEGACY;
                }

                if (!eht_oper || !elems->eht_cap) {
                        eht_oper = NULL;
                        mode = IEEE80211_CONN_MODE_HE;
                }

                if (!ieee80211_chandef_he_6ghz_oper(sdata->local, he_oper,
                                                    eht_oper, chandef)) {
                        sdata_info(sdata, "bad HE/EHT 6 GHz operation\n");
                        return IEEE80211_CONN_MODE_LEGACY;
                }

                if (mode <= IEEE80211_CONN_MODE_EHT)
                        return mode;
                goto check_uhr;
        }

        /* now we have the progression HT, VHT, ... */
        if (conn->mode < IEEE80211_CONN_MODE_HT)
                return IEEE80211_CONN_MODE_LEGACY;

        if (!ht_oper || !elems->ht_cap_elem)
                return IEEE80211_CONN_MODE_LEGACY;

        chandef->width = NL80211_CHAN_WIDTH_20;

        ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
                                                  channel->band);
        /* check that channel matches the right operating channel */
        if (!ignore_ht_channel_mismatch && channel->center_freq != ht_cfreq) {
                /*
                 * It's possible that some APs are confused here;
                 * Netgear WNDR3700 sometimes reports 4 higher than
                 * the actual channel in association responses, but
                 * since we look at probe response/beacon data here
                 * it should be OK.
                 */
                sdata_info(sdata,
                           "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
                           channel->center_freq, ht_cfreq,
                           ht_oper->primary_chan, channel->band);
                return IEEE80211_CONN_MODE_LEGACY;
        }

        ieee80211_chandef_ht_oper(ht_oper, chandef);

        if (conn->mode < IEEE80211_CONN_MODE_VHT)
                return IEEE80211_CONN_MODE_HT;

        vht_chandef = *chandef;

        /*
         * having he_cap/he_oper parsed out implies we're at
         * least operating as HE STA
         */
        if (elems->he_cap && he_oper &&
            he_oper->he_oper_params & cpu_to_le32(IEEE80211_HE_OPERATION_VHT_OPER_INFO)) {
                struct ieee80211_vht_operation he_oper_vht_cap;

                /*
                 * Set only first 3 bytes (other 2 aren't used in
                 * ieee80211_chandef_vht_oper() anyway)
                 */
                memcpy(&he_oper_vht_cap, he_oper->optional, 3);
                he_oper_vht_cap.basic_mcs_set = cpu_to_le16(0);

                if (!ieee80211_chandef_vht_oper(&sdata->local->hw, vht_cap_info,
                                                &he_oper_vht_cap, ht_oper,
                                                &vht_chandef)) {
                        sdata_info(sdata,
                                   "HE AP VHT information is invalid, disabling HE\n");
                        /* this will cause us to re-parse as VHT STA */
                        return IEEE80211_CONN_MODE_VHT;
                }
        } else if (!vht_oper || !elems->vht_cap_elem) {
                if (sband->band == NL80211_BAND_5GHZ)
                        return IEEE80211_CONN_MODE_HT;
                no_vht = true;
        } else if (sband->band == NL80211_BAND_2GHZ) {
                no_vht = true;
        } else if (!ieee80211_chandef_vht_oper(&sdata->local->hw,
                                               vht_cap_info,
                                               vht_oper, ht_oper,
                                               &vht_chandef)) {
                sdata_info(sdata,
                           "AP VHT information is invalid, disabling VHT\n");
                return IEEE80211_CONN_MODE_HT;
        }

        if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
                sdata_info(sdata,
                           "AP VHT information doesn't match HT, disabling VHT\n");
                return IEEE80211_CONN_MODE_HT;
        }

        *chandef = vht_chandef;

        /* stick to current max mode if we or the AP don't have HE */
        if (conn->mode < IEEE80211_CONN_MODE_HE ||
            !elems->he_operation || !elems->he_cap) {
                if (no_vht)
                        return IEEE80211_CONN_MODE_HT;
                return IEEE80211_CONN_MODE_VHT;
        }

        /* stick to HE if we or the AP don't have EHT */
        if (conn->mode < IEEE80211_CONN_MODE_EHT ||
            !eht_oper || !elems->eht_cap)
                return IEEE80211_CONN_MODE_HE;

        /*
         * handle the case that the EHT operation indicates that it holds EHT
         * operation information (in case that the channel width differs from
         * the channel width reported in HT/VHT/HE).
         */
        if (eht_oper->params & IEEE80211_EHT_OPER_INFO_PRESENT) {
                struct cfg80211_chan_def eht_chandef = *chandef;

                ieee80211_chandef_eht_oper((const void *)eht_oper->optional,
                                           &eht_chandef);

                eht_chandef.punctured =
                        ieee80211_eht_oper_dis_subchan_bitmap(eht_oper);

                if (!cfg80211_chandef_valid(&eht_chandef)) {
                        sdata_info(sdata,
                                   "AP EHT information is invalid, disabling EHT\n");
                        return IEEE80211_CONN_MODE_HE;
                }

                if (!cfg80211_chandef_compatible(chandef, &eht_chandef)) {
                        sdata_info(sdata,
                                   "AP EHT information doesn't match HT/VHT/HE, disabling EHT\n");
                        return IEEE80211_CONN_MODE_HE;
                }

                *chandef = eht_chandef;
        }

check_uhr:
        if (conn->mode < IEEE80211_CONN_MODE_UHR || !uhr_oper)
                return IEEE80211_CONN_MODE_EHT;

        /*
         * In beacons we don't have all the data - but we know the size was OK,
         * so if the size is valid as a non-beacon case, we have more data and
         * can validate the NPCA parameters.
         */
        if (ieee80211_uhr_oper_size_ok((const void *)uhr_oper,
                                       elems->uhr_operation_len,
                                       false)) {
                struct cfg80211_chan_def npca_chandef = *chandef;
                const struct ieee80211_uhr_npca_info *npca;
                const __le16 *dis_subch_bmap;
                u16 punct = chandef->punctured, npca_punct;

                npca = ieee80211_uhr_npca_info(uhr_oper);
                if (npca) {
                        int width = cfg80211_chandef_get_width(chandef);
                        u8 offs = le32_get_bits(npca->params,
                                                IEEE80211_UHR_NPCA_PARAMS_PRIMARY_CHAN_OFFS);
                        u32 cf1 = chandef->center_freq1;
                        bool pri_upper, npca_upper;

                        pri_upper = chandef->chan->center_freq > cf1;
                        npca_upper = 20 * offs >= width / 2;

                        if (20 * offs >= cfg80211_chandef_get_width(chandef) ||
                            pri_upper == npca_upper) {
                                sdata_info(sdata,
                                           "AP UHR NPCA primary channel invalid, disabling UHR\n");
                                return IEEE80211_CONN_MODE_EHT;
                        }
                }

                dis_subch_bmap = ieee80211_uhr_npca_dis_subch_bitmap(uhr_oper);

                if (dis_subch_bmap) {
                        npca_punct = get_unaligned_le16(dis_subch_bmap);
                        npca_chandef.punctured = npca_punct;
                }

                /*
                 * must be a valid puncturing pattern for this channel as
                 * well as puncturing all subchannels that are already in
                 * the disabled subchannel bitmap on the primary channel
                 */
                if (!cfg80211_chandef_valid(&npca_chandef) ||
                    ((punct & npca_punct) != punct)) {
                        sdata_info(sdata,
                                   "AP UHR NPCA disabled subchannel bitmap invalid, disabling UHR\n");
                        return IEEE80211_CONN_MODE_EHT;
                }
        }

        return IEEE80211_CONN_MODE_UHR;
}

static bool
ieee80211_verify_sta_ht_mcs_support(struct ieee80211_sub_if_data *sdata,
                                    struct ieee80211_supported_band *sband,
                                    const struct ieee80211_ht_operation *ht_op)
{
        struct ieee80211_sta_ht_cap sta_ht_cap;
        int i;

        if (sband->band == NL80211_BAND_6GHZ)
                return true;

        if (!ht_op)
                return false;

        memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
        ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);

        /*
         * P802.11REVme/D7.0 - 6.5.4.2.4
         * ...
         * If the MLME of an HT STA receives an MLME-JOIN.request primitive
         * with the SelectedBSS parameter containing a Basic HT-MCS Set field
         * in the HT Operation parameter that contains any unsupported MCSs,
         * the MLME response in the resulting MLME-JOIN.confirm primitive shall
         * contain a ResultCode parameter that is not set to the value SUCCESS.
         * ...
         */

        /* Simply check that all basic rates are in the STA RX mask */
        for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
                if ((ht_op->basic_set[i] & sta_ht_cap.mcs.rx_mask[i]) !=
                    ht_op->basic_set[i])
                        return false;
        }

        return true;
}

static bool
ieee80211_verify_sta_vht_mcs_support(struct ieee80211_sub_if_data *sdata,
                                     int link_id,
                                     struct ieee80211_supported_band *sband,
                                     const struct ieee80211_vht_operation *vht_op)
{
        struct ieee80211_sta_vht_cap sta_vht_cap;
        u16 ap_min_req_set, sta_rx_mcs_map, sta_tx_mcs_map;
        int nss;

        if (sband->band != NL80211_BAND_5GHZ)
                return true;

        if (!vht_op)
                return false;

        memcpy(&sta_vht_cap, &sband->vht_cap, sizeof(sta_vht_cap));
        ieee80211_apply_vhtcap_overrides(sdata, &sta_vht_cap);

        ap_min_req_set = le16_to_cpu(vht_op->basic_mcs_set);
        sta_rx_mcs_map = le16_to_cpu(sta_vht_cap.vht_mcs.rx_mcs_map);
        sta_tx_mcs_map = le16_to_cpu(sta_vht_cap.vht_mcs.tx_mcs_map);

        /*
         * Many APs are incorrectly advertising an all-zero value here,
         * which really means MCS 0-7 are required for 1-8 streams, but
         * they don't really mean it that way.
         * Some other APs are incorrectly advertising 3 spatial streams
         * with MCS 0-7 are required, but don't really mean it that way
         * and we'll connect only with HT, rather than even HE.
         * As a result, unfortunately the VHT basic MCS/NSS set cannot
         * be used at all, so check it only in strict mode.
         */
        if (!ieee80211_hw_check(&sdata->local->hw, STRICT))
                return true;

        /*
         * P802.11REVme/D7.0 - 6.5.4.2.4
         * ...
         * If the MLME of a VHT STA receives an MLME-JOIN.request primitive
         * with a SelectedBSS parameter containing a Basic VHT-MCS And NSS Set
         * field in the VHT Operation parameter that contains any unsupported
         * <VHT-MCS, NSS> tuple, the MLME response in the resulting
         * MLME-JOIN.confirm primitive shall contain a ResultCode parameter
         * that is not set to the value SUCCESS.
         * ...
         */
        for (nss = 8; nss > 0; nss--) {
                u8 ap_op_val = (ap_min_req_set >> (2 * (nss - 1))) & 3;
                u8 sta_rx_val;
                u8 sta_tx_val;

                if (ap_op_val == IEEE80211_HE_MCS_NOT_SUPPORTED)
                        continue;

                sta_rx_val = (sta_rx_mcs_map >> (2 * (nss - 1))) & 3;
                sta_tx_val = (sta_tx_mcs_map >> (2 * (nss - 1))) & 3;

                if (sta_rx_val == IEEE80211_HE_MCS_NOT_SUPPORTED ||
                    sta_tx_val == IEEE80211_HE_MCS_NOT_SUPPORTED ||
                    sta_rx_val < ap_op_val || sta_tx_val < ap_op_val) {
                        link_id_info(sdata, link_id,
                                     "Missing mandatory rates for %d Nss, rx %d, tx %d oper %d, disable VHT\n",
                                     nss, sta_rx_val, sta_tx_val, ap_op_val);
                        return false;
                }
        }

        return true;
}

static bool
ieee80211_verify_peer_he_mcs_support(struct ieee80211_sub_if_data *sdata,
                                     int link_id,
                                     const struct ieee80211_he_cap_elem *he_cap,
                                     const struct ieee80211_he_operation *he_op)
{
        struct ieee80211_he_mcs_nss_supp *he_mcs_nss_supp;
        u16 mcs_80_map_tx, mcs_80_map_rx;
        u16 ap_min_req_set;
        int nss;

        if (!he_cap)
                return false;

        /* mcs_nss is right after he_cap info */
        he_mcs_nss_supp = (void *)(he_cap + 1);

        mcs_80_map_tx = le16_to_cpu(he_mcs_nss_supp->tx_mcs_80);
        mcs_80_map_rx = le16_to_cpu(he_mcs_nss_supp->rx_mcs_80);

        /* P802.11-REVme/D0.3
         * 27.1.1 Introduction to the HE PHY
         * ...
         * An HE STA shall support the following features:
         * ...
         * Single spatial stream HE-MCSs 0 to 7 (transmit and receive) in all
         * supported channel widths for HE SU PPDUs
         */
        if ((mcs_80_map_tx & 0x3) == IEEE80211_HE_MCS_NOT_SUPPORTED ||
            (mcs_80_map_rx & 0x3) == IEEE80211_HE_MCS_NOT_SUPPORTED) {
                link_id_info(sdata, link_id,
                             "Missing mandatory rates for 1 Nss, rx 0x%x, tx 0x%x, disable HE\n",
                             mcs_80_map_tx, mcs_80_map_rx);
                return false;
        }

        if (!he_op)
                return true;

        ap_min_req_set = le16_to_cpu(he_op->he_mcs_nss_set);

        /*
         * Apparently iPhone 13 (at least iOS version 15.3.1) sets this to all
         * zeroes, which is nonsense, and completely inconsistent with itself
         * (it doesn't have 8 streams). Accept the settings in this case anyway.
         */
        if (!ieee80211_hw_check(&sdata->local->hw, STRICT) && !ap_min_req_set)
                return true;

        /* make sure the AP is consistent with itself
         *
         * P802.11-REVme/D0.3
         * 26.17.1 Basic HE BSS operation
         *
         * A STA that is operating in an HE BSS shall be able to receive and
         * transmit at each of the <HE-MCS, NSS> tuple values indicated by the
         * Basic HE-MCS And NSS Set field of the HE Operation parameter of the
         * MLME-START.request primitive and shall be able to receive at each of
         * the <HE-MCS, NSS> tuple values indicated by the Supported HE-MCS and
         * NSS Set field in the HE Capabilities parameter of the MLMESTART.request
         * primitive
         */
        for (nss = 8; nss > 0; nss--) {
                u8 ap_op_val = (ap_min_req_set >> (2 * (nss - 1))) & 3;
                u8 ap_rx_val;
                u8 ap_tx_val;

                if (ap_op_val == IEEE80211_HE_MCS_NOT_SUPPORTED)
                        continue;

                ap_rx_val = (mcs_80_map_rx >> (2 * (nss - 1))) & 3;
                ap_tx_val = (mcs_80_map_tx >> (2 * (nss - 1))) & 3;

                if (ap_rx_val == IEEE80211_HE_MCS_NOT_SUPPORTED ||
                    ap_tx_val == IEEE80211_HE_MCS_NOT_SUPPORTED ||
                    ap_rx_val < ap_op_val || ap_tx_val < ap_op_val) {
                        link_id_info(sdata, link_id,
                                     "Invalid rates for %d Nss, rx %d, tx %d oper %d, disable HE\n",
                                     nss, ap_rx_val, ap_tx_val, ap_op_val);
                        return false;
                }
        }

        return true;
}

static bool
ieee80211_verify_sta_he_mcs_support(struct ieee80211_sub_if_data *sdata,
                                    struct ieee80211_supported_band *sband,
                                    const struct ieee80211_he_operation *he_op)
{
        const struct ieee80211_sta_he_cap *sta_he_cap =
                ieee80211_get_he_iftype_cap_vif(sband, &sdata->vif);
        u16 ap_min_req_set;
        int i;

        if (!sta_he_cap || !he_op)
                return false;

        ap_min_req_set = le16_to_cpu(he_op->he_mcs_nss_set);

        /*
         * Apparently iPhone 13 (at least iOS version 15.3.1) sets this to all
         * zeroes, which is nonsense, and completely inconsistent with itself
         * (it doesn't have 8 streams). Accept the settings in this case anyway.
         */
        if (!ieee80211_hw_check(&sdata->local->hw, STRICT) && !ap_min_req_set)
                return true;

        /* Need to go over for 80MHz, 160MHz and for 80+80 */
        for (i = 0; i < 3; i++) {
                const struct ieee80211_he_mcs_nss_supp *sta_mcs_nss_supp =
                        &sta_he_cap->he_mcs_nss_supp;
                u16 sta_mcs_map_rx =
                        le16_to_cpu(((__le16 *)sta_mcs_nss_supp)[2 * i]);
                u16 sta_mcs_map_tx =
                        le16_to_cpu(((__le16 *)sta_mcs_nss_supp)[2 * i + 1]);
                u8 nss;
                bool verified = true;

                /*
                 * For each band there is a maximum of 8 spatial streams
                 * possible. Each of the sta_mcs_map_* is a 16-bit struct built
                 * of 2 bits per NSS (1-8), with the values defined in enum
                 * ieee80211_he_mcs_support. Need to make sure STA TX and RX
                 * capabilities aren't less than the AP's minimum requirements
                 * for this HE BSS per SS.
                 * It is enough to find one such band that meets the reqs.
                 */
                for (nss = 8; nss > 0; nss--) {
                        u8 sta_rx_val = (sta_mcs_map_rx >> (2 * (nss - 1))) & 3;
                        u8 sta_tx_val = (sta_mcs_map_tx >> (2 * (nss - 1))) & 3;
                        u8 ap_val = (ap_min_req_set >> (2 * (nss - 1))) & 3;

                        if (ap_val == IEEE80211_HE_MCS_NOT_SUPPORTED)
                                continue;

                        /*
                         * Make sure the HE AP doesn't require MCSs that aren't
                         * supported by the client as required by spec
                         *
                         * P802.11-REVme/D0.3
                         * 26.17.1 Basic HE BSS operation
                         *
                         * An HE STA shall not attempt to join * (MLME-JOIN.request primitive)
                         * a BSS, unless it supports (i.e., is able to both transmit and
                         * receive using) all of the <HE-MCS, NSS> tuples in the basic
                         * HE-MCS and NSS set.
                         */
                        if (sta_rx_val == IEEE80211_HE_MCS_NOT_SUPPORTED ||
                            sta_tx_val == IEEE80211_HE_MCS_NOT_SUPPORTED ||
                            (ap_val > sta_rx_val) || (ap_val > sta_tx_val)) {
                                verified = false;
                                break;
                        }
                }

                if (verified)
                        return true;
        }

        /* If here, STA doesn't meet AP's HE min requirements */
        return false;
}

static u8
ieee80211_get_eht_cap_mcs_nss(const struct ieee80211_sta_he_cap *sta_he_cap,
                              const struct ieee80211_sta_eht_cap *sta_eht_cap,
                              unsigned int idx, int bw)
{
        u8 he_phy_cap0 = sta_he_cap->he_cap_elem.phy_cap_info[0];
        u8 eht_phy_cap0 = sta_eht_cap->eht_cap_elem.phy_cap_info[0];

        /* handle us being a 20 MHz-only EHT STA - with four values
         * for MCS 0-7, 8-9, 10-11, 12-13.
         */
        if (!(he_phy_cap0 & IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_MASK_ALL))
                return sta_eht_cap->eht_mcs_nss_supp.only_20mhz.rx_tx_max_nss[idx];

        /* the others have MCS 0-9 together, rather than separately from 0-7 */
        if (idx > 0)
                idx--;

        switch (bw) {
        case 0:
                return sta_eht_cap->eht_mcs_nss_supp.bw._80.rx_tx_max_nss[idx];
        case 1:
                if (!(he_phy_cap0 &
                      (IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G |
                       IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_80PLUS80_MHZ_IN_5G)))
                        return 0xff; /* pass check */
                return sta_eht_cap->eht_mcs_nss_supp.bw._160.rx_tx_max_nss[idx];
        case 2:
                if (!(eht_phy_cap0 & IEEE80211_EHT_PHY_CAP0_320MHZ_IN_6GHZ))
                        return 0xff; /* pass check */
                return sta_eht_cap->eht_mcs_nss_supp.bw._320.rx_tx_max_nss[idx];
        }

        WARN_ON(1);
        return 0;
}

static bool
ieee80211_verify_sta_eht_mcs_support(struct ieee80211_sub_if_data *sdata,
                                     struct ieee80211_supported_band *sband,
                                     const struct ieee80211_eht_operation *eht_op)
{
        const struct ieee80211_sta_he_cap *sta_he_cap =
                ieee80211_get_he_iftype_cap_vif(sband, &sdata->vif);
        const struct ieee80211_sta_eht_cap *sta_eht_cap =
                ieee80211_get_eht_iftype_cap_vif(sband, &sdata->vif);
        const struct ieee80211_eht_mcs_nss_supp_20mhz_only *req;
        unsigned int i;

        if (!sta_he_cap || !sta_eht_cap || !eht_op)
                return false;

        req = &eht_op->basic_mcs_nss;

        for (i = 0; i < ARRAY_SIZE(req->rx_tx_max_nss); i++) {
                u8 req_rx_nss, req_tx_nss;
                unsigned int bw;

                req_rx_nss = u8_get_bits(req->rx_tx_max_nss[i],
                                         IEEE80211_EHT_MCS_NSS_RX);
                req_tx_nss = u8_get_bits(req->rx_tx_max_nss[i],
                                         IEEE80211_EHT_MCS_NSS_TX);

                for (bw = 0; bw < 3; bw++) {
                        u8 have, have_rx_nss, have_tx_nss;

                        have = ieee80211_get_eht_cap_mcs_nss(sta_he_cap,
                                                             sta_eht_cap,
                                                             i, bw);
                        have_rx_nss = u8_get_bits(have,
                                                  IEEE80211_EHT_MCS_NSS_RX);
                        have_tx_nss = u8_get_bits(have,
                                                  IEEE80211_EHT_MCS_NSS_TX);

                        if (req_rx_nss > have_rx_nss ||
                            req_tx_nss > have_tx_nss)
                                return false;
                }
        }

        return true;
}

static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
                                const u8 *supp_rates,
                                unsigned int supp_rates_len,
                                const u8 *ext_supp_rates,
                                unsigned int ext_supp_rates_len,
                                u32 *rates, u32 *basic_rates,
                                unsigned long *unknown_rates_selectors,
                                bool *have_higher_than_11mbit,
                                int *min_rate, int *min_rate_index)
{
        int i, j;

        for (i = 0; i < supp_rates_len + ext_supp_rates_len; i++) {
                u8 supp_rate = i < supp_rates_len ?
                                supp_rates[i] :
                                ext_supp_rates[i - supp_rates_len];
                int rate = supp_rate & 0x7f;
                bool is_basic = !!(supp_rate & 0x80);

                if ((rate * 5) > 110 && have_higher_than_11mbit)
                        *have_higher_than_11mbit = true;

                /*
                 * Skip membership selectors since they're not rates.
                 *
                 * Note: Even though the membership selector and the basic
                 *       rate flag share the same bit, they are not exactly
                 *       the same.
                 */
                if (is_basic && rate >= BSS_MEMBERSHIP_SELECTOR_MIN) {
                        if (unknown_rates_selectors)
                                set_bit(rate, unknown_rates_selectors);
                        continue;
                }

                for (j = 0; j < sband->n_bitrates; j++) {
                        struct ieee80211_rate *br;
                        int brate;

                        br = &sband->bitrates[j];

                        brate = DIV_ROUND_UP(br->bitrate, 5);
                        if (brate == rate) {
                                if (rates)
                                        *rates |= BIT(j);
                                if (is_basic && basic_rates)
                                        *basic_rates |= BIT(j);
                                if (min_rate && (rate * 5) < *min_rate) {
                                        *min_rate = rate * 5;
                                        if (min_rate_index)
                                                *min_rate_index = j;
                                }
                                break;
                        }
                }

                /* Handle an unknown entry as if it is an unknown selector */
                if (is_basic && unknown_rates_selectors && j == sband->n_bitrates)
                        set_bit(rate, unknown_rates_selectors);
        }
}

static bool ieee80211_chandef_usable(struct ieee80211_sub_if_data *sdata,
                                     const struct cfg80211_chan_def *chandef,
                                     u32 prohibited_flags)
{
        if (!cfg80211_chandef_usable(sdata->local->hw.wiphy,
                                     chandef, prohibited_flags))
                return false;

        if (chandef->punctured &&
            ieee80211_hw_check(&sdata->local->hw, DISALLOW_PUNCTURING))
                return false;

        return true;
}

static int ieee80211_chandef_num_subchans(const struct cfg80211_chan_def *c)
{
        if (c->width == NL80211_CHAN_WIDTH_80P80)
                return 4 + 4;

        return cfg80211_chandef_get_width(c) / 20;
}

static int ieee80211_chandef_num_widths(const struct cfg80211_chan_def *c)
{
        switch (c->width) {
        case NL80211_CHAN_WIDTH_20:
        case NL80211_CHAN_WIDTH_20_NOHT:
                return 1;
        case NL80211_CHAN_WIDTH_40:
                return 2;
        case NL80211_CHAN_WIDTH_80P80:
        case NL80211_CHAN_WIDTH_80:
                return 3;
        case NL80211_CHAN_WIDTH_160:
                return 4;
        case NL80211_CHAN_WIDTH_320:
                return 5;
        default:
                WARN_ON(1);
                return 0;
        }
}

VISIBLE_IF_MAC80211_KUNIT int
ieee80211_calc_chandef_subchan_offset(const struct cfg80211_chan_def *ap,
                                      u8 n_partial_subchans)
{
        int n = ieee80211_chandef_num_subchans(ap);
        struct cfg80211_chan_def tmp = *ap;
        int offset = 0;

        /*
         * Given a chandef (in this context, it's the AP's) and a number
         * of subchannels that we want to look at ('n_partial_subchans'),
         * calculate the offset in number of subchannels between the full
         * and the subset with the desired width.
         */

        /* same number of subchannels means no offset, obviously */
        if (n == n_partial_subchans)
                return 0;

        /* don't WARN - misconfigured APs could cause this if their N > width */
        if (n < n_partial_subchans)
                return 0;

        while (ieee80211_chandef_num_subchans(&tmp) > n_partial_subchans) {
                u32 prev = tmp.center_freq1;

                ieee80211_chandef_downgrade(&tmp, NULL);

                /*
                 * if center_freq moved up, half the original channels
                 * are gone now but were below, so increase offset
                 */
                if (prev < tmp.center_freq1)
                        offset += ieee80211_chandef_num_subchans(&tmp);
        }

        /*
         * 80+80 with secondary 80 below primary - four subchannels for it
         * (we cannot downgrade *to* 80+80, so no need to consider 'tmp')
         */
        if (ap->width == NL80211_CHAN_WIDTH_80P80 &&
            ap->center_freq2 < ap->center_freq1)
                offset += 4;

        return offset;
}
EXPORT_SYMBOL_IF_MAC80211_KUNIT(ieee80211_calc_chandef_subchan_offset);

VISIBLE_IF_MAC80211_KUNIT void
ieee80211_rearrange_tpe_psd(struct ieee80211_parsed_tpe_psd *psd,
                            const struct cfg80211_chan_def *ap,
                            const struct cfg80211_chan_def *used)
{
        u8 needed = ieee80211_chandef_num_subchans(used);
        u8 have = ieee80211_chandef_num_subchans(ap);
        u8 tmp[IEEE80211_TPE_PSD_ENTRIES_320MHZ];
        u8 offset;

        if (!psd->valid)
                return;

        /* if N is zero, all defaults were used, no point in rearranging */
        if (!psd->n)
                goto out;

        BUILD_BUG_ON(sizeof(tmp) != sizeof(psd->power));

        /*
         * This assumes that 'N' is consistent with the HE channel, as
         * it should be (otherwise the AP is broken).
         *
         * In psd->power we have values in the order 0..N, 0..K, where
         * N+K should cover the entire channel per 'ap', but even if it
         * doesn't then we've pre-filled 'unlimited' as defaults.
         *
         * But this is all the wrong order, we want to have them in the
         * order of the 'used' channel.
         *
         * So for example, we could have a 320 MHz EHT AP, which has the
         * HE channel as 80 MHz (e.g. due to puncturing, which doesn't
         * seem to be considered for the TPE), as follows:
         *
         * EHT  320:   |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
         * HE    80:                           |  |  |  |  |
         * used 160:                           |  |  |  |  |  |  |  |  |
         *
         * N entries:                          |--|--|--|--|
         * K entries:  |--|--|--|--|--|--|--|--|           |--|--|--|--|
         * power idx:   4  5  6  7  8  9  10 11 0  1  2  3  12 13 14 15
         * full chan:   0  1  2  3  4  5  6  7  8  9  10 11 12 13 14 15
         * used chan:                           0  1  2  3  4  5  6  7
         *
         * The idx in the power array ('power idx') is like this since it
         * comes directly from the element's N and K entries in their
         * element order, and those are this way for HE compatibility.
         *
         * Rearrange them as desired here, first by putting them into the
         * 'full chan' order, and then selecting the necessary subset for
         * the 'used chan'.
         */

        /* first reorder according to AP channel */
        offset = ieee80211_calc_chandef_subchan_offset(ap, psd->n);
        for (int i = 0; i < have; i++) {
                if (i < offset)
                        tmp[i] = psd->power[i + psd->n];
                else if (i < offset + psd->n)
                        tmp[i] = psd->power[i - offset];
                else
                        tmp[i] = psd->power[i];
        }

        /*
         * and then select the subset for the used channel
         * (set everything to defaults first in case a driver is confused)
         */
        memset(psd->power, IEEE80211_TPE_PSD_NO_LIMIT, sizeof(psd->power));
        offset = ieee80211_calc_chandef_subchan_offset(ap, needed);
        for (int i = 0; i < needed; i++)
                psd->power[i] = tmp[offset + i];

out:
        /* limit, but don't lie if there are defaults in the data */
        if (needed < psd->count)
                psd->count = needed;
}
EXPORT_SYMBOL_IF_MAC80211_KUNIT(ieee80211_rearrange_tpe_psd);

static void ieee80211_rearrange_tpe(struct ieee80211_parsed_tpe *tpe,
                                    const struct cfg80211_chan_def *ap,
                                    const struct cfg80211_chan_def *used)
{
        /* ignore this completely for narrow/invalid channels */
        if (!ieee80211_chandef_num_subchans(ap) ||
            !ieee80211_chandef_num_subchans(used)) {
                ieee80211_clear_tpe(tpe);
                return;
        }

        for (int i = 0; i < 2; i++) {
                int needed_pwr_count;

                ieee80211_rearrange_tpe_psd(&tpe->psd_local[i], ap, used);
                ieee80211_rearrange_tpe_psd(&tpe->psd_reg_client[i], ap, used);

                /* limit this to the widths we actually need */
                needed_pwr_count = ieee80211_chandef_num_widths(used);
                if (needed_pwr_count < tpe->max_local[i].count)
                        tpe->max_local[i].count = needed_pwr_count;
                if (needed_pwr_count < tpe->max_reg_client[i].count)
                        tpe->max_reg_client[i].count = needed_pwr_count;
        }
}

/*
 * The AP part of the channel request is used to distinguish settings
 * to the device used for wider bandwidth OFDMA. This is used in the
 * channel context code to assign two channel contexts even if they're
 * both for the same channel, if the AP bandwidths are incompatible.
 * If not EHT (or driver override) then ap.chan == NULL indicates that
 * there's no wider BW OFDMA used.
 */
static void ieee80211_set_chanreq_ap(struct ieee80211_sub_if_data *sdata,
                                     struct ieee80211_chan_req *chanreq,
                                     struct ieee80211_conn_settings *conn,
                                     struct cfg80211_chan_def *ap_chandef)
{
        chanreq->ap.chan = NULL;

        if (conn->mode < IEEE80211_CONN_MODE_EHT)
                return;
        if (sdata->vif.driver_flags & IEEE80211_VIF_IGNORE_OFDMA_WIDER_BW)
                return;

        chanreq->ap = *ap_chandef;
}

VISIBLE_IF_MAC80211_KUNIT struct ieee802_11_elems *
ieee80211_determine_chan_mode(struct ieee80211_sub_if_data *sdata,
                              struct ieee80211_conn_settings *conn,
                              struct cfg80211_bss *cbss, int link_id,
                              struct ieee80211_chan_req *chanreq,
                              struct cfg80211_chan_def *ap_chandef,
                              unsigned long *userspace_selectors)
{
        const struct cfg80211_bss_ies *ies = rcu_dereference(cbss->ies);
        struct ieee80211_bss *bss = (void *)cbss->priv;
        struct ieee80211_channel *channel = cbss->channel;
        struct ieee80211_elems_parse_params parse_params = {
                .link_id = -1,
                .from_ap = true,
                .start = ies->data,
                .len = ies->len,
                .type = ies->from_beacon ?
                        IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON :
                        IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_PROBE_RESP,
        };
        struct ieee802_11_elems *elems;
        struct ieee80211_supported_band *sband;
        enum ieee80211_conn_mode ap_mode;
        unsigned long unknown_rates_selectors[BITS_TO_LONGS(128)] = {};
        unsigned long sta_selectors[BITS_TO_LONGS(128)] = {};
        int ret;

again:
        parse_params.mode = conn->mode;
        elems = ieee802_11_parse_elems_full(&parse_params);
        if (!elems)
                return ERR_PTR(-ENOMEM);

        ap_mode = ieee80211_determine_ap_chan(sdata, channel, bss->vht_cap_info,
                                              elems, false, conn, ap_chandef);

        /* this should be impossible since parsing depends on our mode */
        if (WARN_ON(ap_mode > conn->mode)) {
                ret = -EINVAL;
                goto free;
        }

        if (conn->mode != ap_mode) {
                conn->mode = ap_mode;
                kfree(elems);
                goto again;
        }

        mlme_link_id_dbg(sdata, link_id, "determined AP %pM to be %s\n",
                         cbss->bssid, ieee80211_conn_mode_str(ap_mode));

        sband = sdata->local->hw.wiphy->bands[channel->band];

        ieee80211_get_rates(sband, elems->supp_rates, elems->supp_rates_len,
                            elems->ext_supp_rates, elems->ext_supp_rates_len,
                            NULL, NULL, unknown_rates_selectors, NULL, NULL,
                            NULL);

        switch (channel->band) {
        case NL80211_BAND_S1GHZ:
                if (WARN_ON(ap_mode != IEEE80211_CONN_MODE_S1G)) {
                        ret = -EINVAL;
                        goto free;
                }

                chanreq->oper = *ap_chandef;
                if (!cfg80211_chandef_usable(sdata->wdev.wiphy, &chanreq->oper,
                                             IEEE80211_CHAN_DISABLED)) {
                        ret = -EINVAL;
                        goto free;
                }

                return elems;
        case NL80211_BAND_6GHZ:
                if (ap_mode < IEEE80211_CONN_MODE_HE) {
                        link_id_info(sdata, link_id,
                                     "Rejecting non-HE 6/7 GHz connection");
                        ret = -EINVAL;
                        goto free;
                }
                break;
        default:
                if (WARN_ON(ap_mode == IEEE80211_CONN_MODE_S1G)) {
                        ret = -EINVAL;
                        goto free;
                }
        }

        switch (ap_mode) {
        case IEEE80211_CONN_MODE_S1G:
                WARN_ON(1);
                ret = -EINVAL;
                goto free;
        case IEEE80211_CONN_MODE_LEGACY:
                conn->bw_limit = IEEE80211_CONN_BW_LIMIT_20;
                break;
        case IEEE80211_CONN_MODE_HT:
                conn->bw_limit = min_t(enum ieee80211_conn_bw_limit,
                                       conn->bw_limit,
                                       IEEE80211_CONN_BW_LIMIT_40);
                break;
        case IEEE80211_CONN_MODE_VHT:
        case IEEE80211_CONN_MODE_HE:
                conn->bw_limit = min_t(enum ieee80211_conn_bw_limit,
                                       conn->bw_limit,
                                       IEEE80211_CONN_BW_LIMIT_160);
                break;
        case IEEE80211_CONN_MODE_EHT:
        case IEEE80211_CONN_MODE_UHR:
                conn->bw_limit = min_t(enum ieee80211_conn_bw_limit,
                                       conn->bw_limit,
                                       IEEE80211_CONN_BW_LIMIT_320);
                break;
        }

        chanreq->oper = *ap_chandef;

        bitmap_copy(sta_selectors, userspace_selectors, 128);
        if (conn->mode >= IEEE80211_CONN_MODE_HT)
                set_bit(BSS_MEMBERSHIP_SELECTOR_HT_PHY, sta_selectors);
        if (conn->mode >= IEEE80211_CONN_MODE_VHT)
                set_bit(BSS_MEMBERSHIP_SELECTOR_VHT_PHY, sta_selectors);
        if (conn->mode >= IEEE80211_CONN_MODE_HE)
                set_bit(BSS_MEMBERSHIP_SELECTOR_HE_PHY, sta_selectors);
        if (conn->mode >= IEEE80211_CONN_MODE_EHT)
                set_bit(BSS_MEMBERSHIP_SELECTOR_EHT_PHY, sta_selectors);
        if (conn->mode >= IEEE80211_CONN_MODE_UHR)
                set_bit(BSS_MEMBERSHIP_SELECTOR_UHR_PHY, sta_selectors);

        /*
         * We do not support EPD or GLK so never add them.
         * SAE_H2E is handled through userspace_selectors.
         */

        /* Check if we support all required features */
        if (!bitmap_subset(unknown_rates_selectors, sta_selectors, 128)) {
                link_id_info(sdata, link_id,
                             "required basic rate or BSS membership selectors not supported or disabled, rejecting connection\n");
                ret = -EINVAL;
                goto free;
        }

        ieee80211_set_chanreq_ap(sdata, chanreq, conn, ap_chandef);

        while (!ieee80211_chandef_usable(sdata, &chanreq->oper,
                                         IEEE80211_CHAN_DISABLED)) {
                if (chanreq->oper.width == NL80211_CHAN_WIDTH_20_NOHT) {
                        link_id_info(sdata, link_id,
                                     "unusable channel (%d MHz) for connection\n",
                                     chanreq->oper.chan->center_freq);
                        ret = -EINVAL;
                        goto free;
                }

                ieee80211_chanreq_downgrade(chanreq, conn);
        }

        if (conn->mode >= IEEE80211_CONN_MODE_HE &&
            !cfg80211_chandef_usable(sdata->wdev.wiphy, &chanreq->oper,
                                     IEEE80211_CHAN_NO_HE)) {
                conn->mode = IEEE80211_CONN_MODE_VHT;
                conn->bw_limit = min_t(enum ieee80211_conn_bw_limit,
                                       conn->bw_limit,
                                       IEEE80211_CONN_BW_LIMIT_160);
        }

        if (conn->mode >= IEEE80211_CONN_MODE_EHT &&
            !cfg80211_chandef_usable(sdata->wdev.wiphy, &chanreq->oper,
                                     IEEE80211_CHAN_NO_EHT)) {
                conn->mode = IEEE80211_CONN_MODE_HE;
                conn->bw_limit = min_t(enum ieee80211_conn_bw_limit,
                                       conn->bw_limit,
                                       IEEE80211_CONN_BW_LIMIT_160);
        }

        if (conn->mode >= IEEE80211_CONN_MODE_UHR &&
            !cfg80211_chandef_usable(sdata->wdev.wiphy, &chanreq->oper,
                                     IEEE80211_CHAN_NO_UHR))
                conn->mode = IEEE80211_CONN_MODE_EHT;

        if (chanreq->oper.width != ap_chandef->width || ap_mode != conn->mode)
                link_id_info(sdata, link_id,
                             "regulatory prevented using AP config, downgraded\n");

        if (conn->mode >= IEEE80211_CONN_MODE_HT &&
            !ieee80211_verify_sta_ht_mcs_support(sdata, sband,
                                                 elems->ht_operation)) {
                conn->mode = IEEE80211_CONN_MODE_LEGACY;
                conn->bw_limit = IEEE80211_CONN_BW_LIMIT_20;
                link_id_info(sdata, link_id,
                             "required MCSes not supported, disabling HT\n");
        }

        if (conn->mode >= IEEE80211_CONN_MODE_VHT &&
            !ieee80211_verify_sta_vht_mcs_support(sdata, link_id, sband,
                                                  elems->vht_operation)) {
                conn->mode = IEEE80211_CONN_MODE_HT;
                conn->bw_limit = min_t(enum ieee80211_conn_bw_limit,
                                       conn->bw_limit,
                                       IEEE80211_CONN_BW_LIMIT_40);
                link_id_info(sdata, link_id,
                             "required MCSes not supported, disabling VHT\n");
        }

        if (conn->mode >= IEEE80211_CONN_MODE_HE &&
            (!ieee80211_verify_peer_he_mcs_support(sdata, link_id,
                                                   (void *)elems->he_cap,
                                                   elems->he_operation) ||
             !ieee80211_verify_sta_he_mcs_support(sdata, sband,
                                                  elems->he_operation))) {
                conn->mode = IEEE80211_CONN_MODE_VHT;
                link_id_info(sdata, link_id,
                             "required MCSes not supported, disabling HE\n");
        }

        if (conn->mode >= IEEE80211_CONN_MODE_EHT &&
            !ieee80211_verify_sta_eht_mcs_support(sdata, sband,
                                                  elems->eht_operation)) {
                conn->mode = IEEE80211_CONN_MODE_HE;
                conn->bw_limit = min_t(enum ieee80211_conn_bw_limit,
                                       conn->bw_limit,
                                       IEEE80211_CONN_BW_LIMIT_160);
                link_id_info(sdata, link_id,
                             "required MCSes not supported, disabling EHT\n");
        }

        if (conn->mode >= IEEE80211_CONN_MODE_EHT &&
            channel->band != NL80211_BAND_2GHZ &&
            conn->bw_limit == IEEE80211_CONN_BW_LIMIT_40) {
                conn->mode = IEEE80211_CONN_MODE_HE;
                link_id_info(sdata, link_id,
                             "required bandwidth not supported, disabling EHT\n");
        }

        /* the mode can only decrease, so this must terminate */
        if (ap_mode != conn->mode) {
                kfree(elems);
                goto again;
        }

        mlme_link_id_dbg(sdata, link_id,
                         "connecting with %s mode, max bandwidth %d MHz\n",
                         ieee80211_conn_mode_str(conn->mode),
                         20 * (1 << conn->bw_limit));

        if (WARN_ON_ONCE(!cfg80211_chandef_valid(&chanreq->oper))) {
                ret = -EINVAL;
                goto free;
        }

        return elems;
free:
        kfree(elems);
        return ERR_PTR(ret);
}
EXPORT_SYMBOL_IF_MAC80211_KUNIT(ieee80211_determine_chan_mode);

static int ieee80211_config_bw(struct ieee80211_link_data *link,
                               struct ieee802_11_elems *elems,
                               bool update, u64 *changed, u16 stype)
{
        struct ieee80211_channel *channel = link->conf->chanreq.oper.chan;
        struct ieee80211_sub_if_data *sdata = link->sdata;
        struct ieee80211_chan_req chanreq = {};
        struct cfg80211_chan_def ap_chandef;
        enum ieee80211_conn_mode ap_mode;
        const char *frame;
        u32 vht_cap_info = 0;
        u16 ht_opmode;
        int ret;

        switch (stype) {
        case IEEE80211_STYPE_BEACON:
                frame = "beacon";
                break;
        case IEEE80211_STYPE_ASSOC_RESP:
                frame = "assoc response";
                break;
        case IEEE80211_STYPE_REASSOC_RESP:
                frame = "reassoc response";
                break;
        case IEEE80211_STYPE_ACTION:
                /* the only action frame that gets here */
                frame = "ML reconf response";
                break;
        default:
                return -EINVAL;
        }

        /* don't track any bandwidth changes in legacy/S1G modes */
        if (link->u.mgd.conn.mode == IEEE80211_CONN_MODE_LEGACY ||
            link->u.mgd.conn.mode == IEEE80211_CONN_MODE_S1G)
                return 0;

        if (elems->vht_cap_elem)
                vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info);

        ap_mode = ieee80211_determine_ap_chan(sdata, channel, vht_cap_info,
                                              elems, true, &link->u.mgd.conn,
                                              &ap_chandef);

        if (ap_mode != link->u.mgd.conn.mode) {
                link_info(link,
                          "AP %pM appears to change mode (expected %s, found %s) in %s, disconnect\n",
                          link->u.mgd.bssid,
                          ieee80211_conn_mode_str(link->u.mgd.conn.mode),
                          ieee80211_conn_mode_str(ap_mode), frame);
                return -EINVAL;
        }

        chanreq.oper = ap_chandef;
        ieee80211_set_chanreq_ap(sdata, &chanreq, &link->u.mgd.conn,
                                 &ap_chandef);

        /*
         * if HT operation mode changed store the new one -
         * this may be applicable even if channel is identical
         */
        if (elems->ht_operation) {
                ht_opmode = le16_to_cpu(elems->ht_operation->operation_mode);
                if (link->conf->ht_operation_mode != ht_opmode) {
                        *changed |= BSS_CHANGED_HT;
                        link->conf->ht_operation_mode = ht_opmode;
                }
        }

        /*
         * Downgrade the new channel if we associated with restricted
         * bandwidth capabilities. For example, if we associated as a
         * 20 MHz STA to a 40 MHz AP (due to regulatory, capabilities
         * or config reasons) then switching to a 40 MHz channel now
         * won't do us any good -- we couldn't use it with the AP.
         */
        while (link->u.mgd.conn.bw_limit <
                        ieee80211_min_bw_limit_from_chandef(&chanreq.oper))
                ieee80211_chandef_downgrade(&chanreq.oper, NULL);

        /* TPE element is not present in (re)assoc/ML reconfig response */
        if (stype == IEEE80211_STYPE_BEACON &&
            ap_chandef.chan->band == NL80211_BAND_6GHZ &&
            link->u.mgd.conn.mode >= IEEE80211_CONN_MODE_HE) {
                ieee80211_rearrange_tpe(&elems->tpe, &ap_chandef,
                                        &chanreq.oper);
                if (memcmp(&link->conf->tpe, &elems->tpe, sizeof(elems->tpe))) {
                        link->conf->tpe = elems->tpe;
                        *changed |= BSS_CHANGED_TPE;
                }
        }

        if (ieee80211_chanreq_identical(&chanreq, &link->conf->chanreq))
                return 0;

        link_info(link,
                  "AP %pM changed bandwidth in %s, new used config is %d.%03d MHz, width %d (%d.%03d/%d MHz)\n",
                  link->u.mgd.bssid, frame, chanreq.oper.chan->center_freq,
                  chanreq.oper.chan->freq_offset, chanreq.oper.width,
                  chanreq.oper.center_freq1, chanreq.oper.freq1_offset,
                  chanreq.oper.center_freq2);

        if (!cfg80211_chandef_valid(&chanreq.oper)) {
                sdata_info(sdata,
                           "AP %pM changed caps/bw in %s in a way we can't support - disconnect\n",
                           link->u.mgd.bssid, frame);
                return -EINVAL;
        }

        if (!update) {
                link->conf->chanreq = chanreq;
                return 0;
        }

        /*
         * We're tracking the current AP here, so don't do any further checks
         * here. This keeps us from playing ping-pong with regulatory, without
         * it the following can happen (for example):
         *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
         *  - AP advertises regdom US
         *  - CRDA loads regdom US with 80 MHz prohibited (old database)
         *  - we detect an unsupported channel and disconnect
         *  - disconnect causes CRDA to reload world regdomain and the game
         *    starts anew.
         * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
         *
         * It seems possible that there are still scenarios with CSA or real
         * bandwidth changes where a this could happen, but those cases are
         * less common and wouldn't completely prevent using the AP.
         */

        ret = ieee80211_link_change_chanreq(link, &chanreq, changed);
        if (ret) {
                sdata_info(sdata,
                           "AP %pM changed bandwidth in %s to incompatible one - disconnect\n",
                           link->u.mgd.bssid, frame);
                return ret;
        }

        cfg80211_schedule_channels_check(&sdata->wdev);
        return 0;
}

/* frame sending functions */

static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
                                struct sk_buff *skb, u8 ap_ht_param,
                                struct ieee80211_supported_band *sband,
                                struct ieee80211_channel *channel,
                                enum ieee80211_smps_mode smps,
                                const struct ieee80211_conn_settings *conn)
{
        u8 *pos;
        u32 flags = channel->flags;
        u16 cap;
        struct ieee80211_sta_ht_cap ht_cap;

        BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));

        memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
        ieee80211_apply_htcap_overrides(sdata, &ht_cap);

        /* determine capability flags */
        cap = ht_cap.cap;

        switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
        case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
                if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
                        cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
                        cap &= ~IEEE80211_HT_CAP_SGI_40;
                }
                break;
        case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
                if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
                        cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
                        cap &= ~IEEE80211_HT_CAP_SGI_40;
                }
                break;
        }

        /*
         * If 40 MHz was disabled associate as though we weren't
         * capable of 40 MHz -- some broken APs will never fall
         * back to trying to transmit in 20 MHz.
         */
        if (conn->bw_limit <= IEEE80211_CONN_BW_LIMIT_20) {
                cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
                cap &= ~IEEE80211_HT_CAP_SGI_40;
        }

        /* set SM PS mode properly */
        cap &= ~IEEE80211_HT_CAP_SM_PS;
        switch (smps) {
        case IEEE80211_SMPS_AUTOMATIC:
        case IEEE80211_SMPS_NUM_MODES:
                WARN_ON(1);
                fallthrough;
        case IEEE80211_SMPS_OFF:
                cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
                        IEEE80211_HT_CAP_SM_PS_SHIFT;
                break;
        case IEEE80211_SMPS_STATIC:
                cap |= WLAN_HT_CAP_SM_PS_STATIC <<
                        IEEE80211_HT_CAP_SM_PS_SHIFT;
                break;
        case IEEE80211_SMPS_DYNAMIC:
                cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
                        IEEE80211_HT_CAP_SM_PS_SHIFT;
                break;
        }

        /* reserve and fill IE */
        pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
        ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
}

/* This function determines vht capability flags for the association
 * and builds the IE.
 * Note - the function returns true to own the MU-MIMO capability
 */
static bool ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
                                 struct sk_buff *skb,
                                 struct ieee80211_supported_band *sband,
                                 struct ieee80211_vht_cap *ap_vht_cap,
                                 const struct ieee80211_conn_settings *conn)
{
        struct ieee80211_local *local = sdata->local;
        u8 *pos;
        u32 cap;
        struct ieee80211_sta_vht_cap vht_cap;
        u32 mask, ap_bf_sts, our_bf_sts;
        bool mu_mimo_owner = false;

        BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));

        memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
        ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);

        /* determine capability flags */
        cap = vht_cap.cap;

        if (conn->bw_limit <= IEEE80211_CONN_BW_LIMIT_80) {
                cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
                cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
        }

        /*
         * Some APs apparently get confused if our capabilities are better
         * than theirs, so restrict what we advertise in the assoc request.
         */
        if (!ieee80211_hw_check(&local->hw, STRICT)) {
                if (!(ap_vht_cap->vht_cap_info &
                                cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
                        cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
                                 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
                else if (!(ap_vht_cap->vht_cap_info &
                                cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
                        cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
        }

        /*
         * If some other vif is using the MU-MIMO capability we cannot associate
         * using MU-MIMO - this will lead to contradictions in the group-id
         * mechanism.
         * Ownership is defined since association request, in order to avoid
         * simultaneous associations with MU-MIMO.
         */
        if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
                bool disable_mu_mimo = false;
                struct ieee80211_sub_if_data *other;

                list_for_each_entry(other, &local->interfaces, list) {
                        if (other->vif.bss_conf.mu_mimo_owner) {
                                disable_mu_mimo = true;
                                break;
                        }
                }
                if (disable_mu_mimo)
                        cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
                else
                        mu_mimo_owner = true;
        }

        mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;

        ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
        our_bf_sts = cap & mask;

        if (ap_bf_sts < our_bf_sts) {
                cap &= ~mask;
                cap |= ap_bf_sts;
        }

        /* reserve and fill IE */
        pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
        ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);

        return mu_mimo_owner;
}

static void ieee80211_assoc_add_rates(struct ieee80211_local *local,
                                      struct sk_buff *skb,
                                      enum nl80211_chan_width width,
                                      struct ieee80211_supported_band *sband,
                                      struct ieee80211_mgd_assoc_data *assoc_data)
{
        u32 rates;

        if (assoc_data->supp_rates_len &&
            !ieee80211_hw_check(&local->hw, STRICT)) {
                /*
                 * Get all rates supported by the device and the AP as
                 * some APs don't like getting a superset of their rates
                 * in the association request (e.g. D-Link DAP 1353 in
                 * b-only mode)...
                 */
                ieee80211_parse_bitrates(sband,
                                         assoc_data->supp_rates,
                                         assoc_data->supp_rates_len,
                                         &rates);
        } else {
                /*
                 * In case AP not provide any supported rates information
                 * before association, we send information element(s) with
                 * all rates that we support.
                 */
                rates = ~0;
        }

        ieee80211_put_srates_elem(skb, sband, 0, ~rates,
                                  WLAN_EID_SUPP_RATES);
        ieee80211_put_srates_elem(skb, sband, 0, ~rates,
                                  WLAN_EID_EXT_SUPP_RATES);
}

static size_t ieee80211_add_before_ht_elems(struct sk_buff *skb,
                                            const u8 *elems,
                                            size_t elems_len,
                                            size_t offset)
{
        size_t noffset;

        static const u8 before_ht[] = {
                WLAN_EID_SSID,
                WLAN_EID_SUPP_RATES,
                WLAN_EID_EXT_SUPP_RATES,
                WLAN_EID_PWR_CAPABILITY,
                WLAN_EID_SUPPORTED_CHANNELS,
                WLAN_EID_RSN,
                WLAN_EID_QOS_CAPA,
                WLAN_EID_RRM_ENABLED_CAPABILITIES,
                WLAN_EID_MOBILITY_DOMAIN,
                WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
                WLAN_EID_RIC_DATA,              /* reassoc only */
                WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
        };
        static const u8 after_ric[] = {
                WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
                WLAN_EID_HT_CAPABILITY,
                WLAN_EID_BSS_COEX_2040,
                /* luckily this is almost always there */
                WLAN_EID_EXT_CAPABILITY,
                WLAN_EID_QOS_TRAFFIC_CAPA,
                WLAN_EID_TIM_BCAST_REQ,
                WLAN_EID_INTERWORKING,
                /* 60 GHz (Multi-band, DMG, MMS) can't happen */
                WLAN_EID_VHT_CAPABILITY,
                WLAN_EID_OPMODE_NOTIF,
        };

        if (!elems_len)
                return offset;

        noffset = ieee80211_ie_split_ric(elems, elems_len,
                                         before_ht,
                                         ARRAY_SIZE(before_ht),
                                         after_ric,
                                         ARRAY_SIZE(after_ric),
                                         offset);
        skb_put_data(skb, elems + offset, noffset - offset);

        return noffset;
}

static size_t ieee80211_add_before_vht_elems(struct sk_buff *skb,
                                             const u8 *elems,
                                             size_t elems_len,
                                             size_t offset)
{
        static const u8 before_vht[] = {
                /*
                 * no need to list the ones split off before HT
                 * or generated here
                 */
                WLAN_EID_BSS_COEX_2040,
                WLAN_EID_EXT_CAPABILITY,
                WLAN_EID_QOS_TRAFFIC_CAPA,
                WLAN_EID_TIM_BCAST_REQ,
                WLAN_EID_INTERWORKING,
                /* 60 GHz (Multi-band, DMG, MMS) can't happen */
        };
        size_t noffset;

        if (!elems_len)
                return offset;

        /* RIC already taken care of in ieee80211_add_before_ht_elems() */
        noffset = ieee80211_ie_split(elems, elems_len,
                                     before_vht, ARRAY_SIZE(before_vht),
                                     offset);
        skb_put_data(skb, elems + offset, noffset - offset);

        return noffset;
}

static size_t ieee80211_add_before_he_elems(struct sk_buff *skb,
                                            const u8 *elems,
                                            size_t elems_len,
                                            size_t offset)
{
        static const u8 before_he[] = {
                /*
                 * no need to list the ones split off before VHT
                 * or generated here
                 */
                WLAN_EID_OPMODE_NOTIF,
                WLAN_EID_EXTENSION, WLAN_EID_EXT_FUTURE_CHAN_GUIDANCE,
                /* 11ai elements */
                WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_SESSION,
                WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_PUBLIC_KEY,
                WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_KEY_CONFIRM,
                WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_HLP_CONTAINER,
                WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_IP_ADDR_ASSIGN,
                /* TODO: add 11ah/11aj/11ak elements */
        };
        size_t noffset;

        if (!elems_len)
                return offset;

        /* RIC already taken care of in ieee80211_add_before_ht_elems() */
        noffset = ieee80211_ie_split(elems, elems_len,
                                     before_he, ARRAY_SIZE(before_he),
                                     offset);
        skb_put_data(skb, elems + offset, noffset - offset);

        return noffset;
}

static size_t ieee80211_add_before_reg_conn(struct sk_buff *skb,
                                            const u8 *elems, size_t elems_len,
                                            size_t offset)
{
        static const u8 before_reg_conn[] = {
                /*
                 * no need to list the ones split off before HE
                 * or generated here
                 */
                WLAN_EID_EXTENSION, WLAN_EID_EXT_DH_PARAMETER,
                WLAN_EID_EXTENSION, WLAN_EID_EXT_KNOWN_STA_IDENTIFCATION,
        };
        size_t noffset;

        if (!elems_len)
                return offset;

        noffset = ieee80211_ie_split(elems, elems_len, before_reg_conn,
                                     ARRAY_SIZE(before_reg_conn), offset);
        skb_put_data(skb, elems + offset, noffset - offset);

        return noffset;
}

#define PRESENT_ELEMS_MAX       8
#define PRESENT_ELEM_EXT_OFFS   0x100

static void
ieee80211_assoc_add_ml_elem(struct ieee80211_sub_if_data *sdata,
                            struct sk_buff *skb, u16 capab,
                            const struct element *ext_capa,
                            const u16 *present_elems,
                            struct ieee80211_mgd_assoc_data *assoc_data);

static size_t
ieee80211_add_link_elems(struct ieee80211_sub_if_data *sdata,
                         struct sk_buff *skb, u16 *capab,
                         const struct element *ext_capa,
                         const u8 *extra_elems,
                         size_t extra_elems_len,
                         unsigned int link_id,
                         struct ieee80211_link_data *link,
                         u16 *present_elems,
                         struct ieee80211_mgd_assoc_data *assoc_data)
{
        enum nl80211_iftype iftype = ieee80211_vif_type_p2p(&sdata->vif);
        struct cfg80211_bss *cbss = assoc_data->link[link_id].bss;
        struct ieee80211_channel *chan = cbss->channel;
        const struct ieee80211_sband_iftype_data *iftd;
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_supported_band *sband;
        enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20;
        struct ieee80211_chanctx_conf *chanctx_conf;
        enum ieee80211_smps_mode smps_mode;
        u16 orig_capab = *capab;
        size_t offset = 0;
        int present_elems_len = 0;
        u8 *pos;
        int i;

#define ADD_PRESENT_ELEM(id) do {                                       \
        /* need a last for termination - we use 0 == SSID */            \
        if (!WARN_ON(present_elems_len >= PRESENT_ELEMS_MAX - 1))       \
                present_elems[present_elems_len++] = (id);              \
} while (0)
#define ADD_PRESENT_EXT_ELEM(id) ADD_PRESENT_ELEM(PRESENT_ELEM_EXT_OFFS | (id))

        if (link)
                smps_mode = link->smps_mode;
        else if (sdata->u.mgd.powersave)
                smps_mode = IEEE80211_SMPS_DYNAMIC;
        else
                smps_mode = IEEE80211_SMPS_OFF;

        if (link) {
                /*
                 * 5/10 MHz scenarios are only viable without MLO, in which
                 * case this pointer should be used ... All of this is a bit
                 * unclear though, not sure this even works at all.
                 */
                rcu_read_lock();
                chanctx_conf = rcu_dereference(link->conf->chanctx_conf);
                if (chanctx_conf)
                        width = chanctx_conf->def.width;
                rcu_read_unlock();
        }

        sband = local->hw.wiphy->bands[chan->band];
        iftd = ieee80211_get_sband_iftype_data(sband, iftype);

        if (sband->band == NL80211_BAND_2GHZ) {
                *capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
                *capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
        }

        if ((cbss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
            ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
                *capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;

        if (sband->band != NL80211_BAND_S1GHZ)
                ieee80211_assoc_add_rates(local, skb, width, sband, assoc_data);

        if (*capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
            *capab & WLAN_CAPABILITY_RADIO_MEASURE) {
                struct cfg80211_chan_def chandef = {
                        .width = width,
                        .chan = chan,
                };

                pos = skb_put(skb, 4);
                *pos++ = WLAN_EID_PWR_CAPABILITY;
                *pos++ = 2;
                *pos++ = 0; /* min tx power */
                 /* max tx power */
                *pos++ = ieee80211_chandef_max_power(&chandef);
                ADD_PRESENT_ELEM(WLAN_EID_PWR_CAPABILITY);
        }

        /*
         * Per spec, we shouldn't include the list of channels if we advertise
         * support for extended channel switching, but we've always done that;
         * (for now?) apply this restriction only on the (new) 6 GHz band.
         */
        if (*capab & WLAN_CAPABILITY_SPECTRUM_MGMT &&
            (sband->band != NL80211_BAND_6GHZ ||
             !ext_capa || ext_capa->datalen < 1 ||
             !(ext_capa->data[0] & WLAN_EXT_CAPA1_EXT_CHANNEL_SWITCHING))) {
                /* TODO: get this in reg domain format */
                pos = skb_put(skb, 2 * sband->n_channels + 2);
                *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
                *pos++ = 2 * sband->n_channels;
                for (i = 0; i < sband->n_channels; i++) {
                        int cf = sband->channels[i].center_freq;

                        *pos++ = ieee80211_frequency_to_channel(cf);
                        *pos++ = 1; /* one channel in the subband*/
                }
                ADD_PRESENT_ELEM(WLAN_EID_SUPPORTED_CHANNELS);
        }

        /* if present, add any custom IEs that go before HT */
        offset = ieee80211_add_before_ht_elems(skb, extra_elems,
                                               extra_elems_len,
                                               offset);

        if (sband->band != NL80211_BAND_6GHZ &&
            assoc_data->link[link_id].conn.mode >= IEEE80211_CONN_MODE_HT) {
                ieee80211_add_ht_ie(sdata, skb,
                                    assoc_data->link[link_id].ap_ht_param,
                                    sband, chan, smps_mode,
                                    &assoc_data->link[link_id].conn);
                ADD_PRESENT_ELEM(WLAN_EID_HT_CAPABILITY);
        }

        /* if present, add any custom IEs that go before VHT */
        offset = ieee80211_add_before_vht_elems(skb, extra_elems,
                                                extra_elems_len,
                                                offset);

        if (sband->band != NL80211_BAND_6GHZ &&
            assoc_data->link[link_id].conn.mode >= IEEE80211_CONN_MODE_VHT &&
            sband->vht_cap.vht_supported) {
                bool mu_mimo_owner =
                        ieee80211_add_vht_ie(sdata, skb, sband,
                                             &assoc_data->link[link_id].ap_vht_cap,
                                             &assoc_data->link[link_id].conn);

                if (link)
                        link->conf->mu_mimo_owner = mu_mimo_owner;
                ADD_PRESENT_ELEM(WLAN_EID_VHT_CAPABILITY);
        }

        /* if present, add any custom IEs that go before HE */
        offset = ieee80211_add_before_he_elems(skb, extra_elems,
                                               extra_elems_len,
                                               offset);

        if (assoc_data->link[link_id].conn.mode >= IEEE80211_CONN_MODE_HE) {
                ieee80211_put_he_cap(skb, sdata, sband,
                                     &assoc_data->link[link_id].conn);
                ADD_PRESENT_EXT_ELEM(WLAN_EID_EXT_HE_CAPABILITY);
                if (sband->band == NL80211_BAND_6GHZ)
                        ieee80211_put_he_6ghz_cap(skb, sdata, smps_mode);
        }

        /*
         * if present, add any custom IEs that go before regulatory
         * connectivity element
         */
        offset = ieee80211_add_before_reg_conn(skb, extra_elems,
                                               extra_elems_len, offset);

        if (sband->band == NL80211_BAND_6GHZ) {
                /*
                 * as per Section E.2.7 of IEEE 802.11 REVme D7.0, non-AP STA
                 * capable of operating on the 6 GHz band shall transmit
                 * regulatory connectivity element.
                 */
                ieee80211_put_reg_conn(skb, chan->flags);
        }

        /*
         * careful - need to know about all the present elems before
         * calling ieee80211_assoc_add_ml_elem(), so add these if
         * we're going to put them after the ML element
         */
        if (assoc_data->link[link_id].conn.mode >= IEEE80211_CONN_MODE_EHT)
                ADD_PRESENT_EXT_ELEM(WLAN_EID_EXT_EHT_CAPABILITY);
        if (assoc_data->link[link_id].conn.mode >= IEEE80211_CONN_MODE_UHR)
                ADD_PRESENT_EXT_ELEM(WLAN_EID_EXT_UHR_CAPA);

        if (link_id == assoc_data->assoc_link_id)
                ieee80211_assoc_add_ml_elem(sdata, skb, orig_capab, ext_capa,
                                            present_elems, assoc_data);

        /* crash if somebody gets it wrong */
        present_elems = NULL;

        if (assoc_data->link[link_id].conn.mode >= IEEE80211_CONN_MODE_EHT)
                ieee80211_put_eht_cap(skb, sdata, sband,
                                      &assoc_data->link[link_id].conn);

        if (assoc_data->link[link_id].conn.mode >= IEEE80211_CONN_MODE_UHR)
                ieee80211_put_uhr_cap(skb, sdata, sband);

        if (sband->band == NL80211_BAND_S1GHZ) {
                ieee80211_add_aid_request_ie(sdata, skb);
                ieee80211_add_s1g_capab_ie(sdata, &sband->s1g_cap, skb);
        }

        if (iftd && iftd->vendor_elems.data && iftd->vendor_elems.len)
                skb_put_data(skb, iftd->vendor_elems.data, iftd->vendor_elems.len);

        return offset;
}

static void ieee80211_add_non_inheritance_elem(struct sk_buff *skb,
                                               const u16 *outer,
                                               const u16 *inner)
{
        unsigned int skb_len = skb->len;
        bool at_extension = false;
        bool added = false;
        int i, j;
        u8 *len, *list_len = NULL;

        skb_put_u8(skb, WLAN_EID_EXTENSION);
        len = skb_put(skb, 1);
        skb_put_u8(skb, WLAN_EID_EXT_NON_INHERITANCE);

        for (i = 0; i < PRESENT_ELEMS_MAX && outer[i]; i++) {
                u16 elem = outer[i];
                bool have_inner = false;

                /* should at least be sorted in the sense of normal -> ext */
                WARN_ON(at_extension && elem < PRESENT_ELEM_EXT_OFFS);

                /* switch to extension list */
                if (!at_extension && elem >= PRESENT_ELEM_EXT_OFFS) {
                        at_extension = true;
                        if (!list_len)
                                skb_put_u8(skb, 0);
                        list_len = NULL;
                }

                for (j = 0; j < PRESENT_ELEMS_MAX && inner[j]; j++) {
                        if (elem == inner[j]) {
                                have_inner = true;
                                break;
                        }
                }

                if (have_inner)
                        continue;

                if (!list_len) {
                        list_len = skb_put(skb, 1);
                        *list_len = 0;
                }
                *list_len += 1;
                skb_put_u8(skb, (u8)elem);
                added = true;
        }

        /* if we added a list but no extension list, make a zero-len one */
        if (added && (!at_extension || !list_len))
                skb_put_u8(skb, 0);

        /* if nothing added remove extension element completely */
        if (!added)
                skb_trim(skb, skb_len);
        else
                *len = skb->len - skb_len - 2;
}

static void
ieee80211_assoc_add_ml_elem(struct ieee80211_sub_if_data *sdata,
                            struct sk_buff *skb, u16 capab,
                            const struct element *ext_capa,
                            const u16 *outer_present_elems,
                            struct ieee80211_mgd_assoc_data *assoc_data)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_multi_link_elem *ml_elem;
        struct ieee80211_mle_basic_common_info *common;
        const struct wiphy_iftype_ext_capab *ift_ext_capa;
        __le16 eml_capa = 0, mld_capa_ops = 0;
        unsigned int link_id;
        u8 *ml_elem_len;
        void *capab_pos;

        if (!ieee80211_vif_is_mld(&sdata->vif))
                return;

        ift_ext_capa = cfg80211_get_iftype_ext_capa(local->hw.wiphy,
                                                    ieee80211_vif_type_p2p(&sdata->vif));
        if (ift_ext_capa) {
                eml_capa = cpu_to_le16(ift_ext_capa->eml_capabilities);
                mld_capa_ops = cpu_to_le16(ift_ext_capa->mld_capa_and_ops);
        }

        skb_put_u8(skb, WLAN_EID_EXTENSION);
        ml_elem_len = skb_put(skb, 1);
        skb_put_u8(skb, WLAN_EID_EXT_EHT_MULTI_LINK);
        ml_elem = skb_put(skb, sizeof(*ml_elem));
        ml_elem->control =
                cpu_to_le16(IEEE80211_ML_CONTROL_TYPE_BASIC |
                            IEEE80211_MLC_BASIC_PRES_MLD_CAPA_OP);
        common = skb_put(skb, sizeof(*common));
        common->len = sizeof(*common) +
                      2;  /* MLD capa/ops */
        memcpy(common->mld_mac_addr, sdata->vif.addr, ETH_ALEN);

        /* add EML_CAPA only if needed, see Draft P802.11be_D2.1, 35.3.17 */
        if (eml_capa &
            cpu_to_le16((IEEE80211_EML_CAP_EMLSR_SUPP |
                         IEEE80211_EML_CAP_EMLMR_SUPPORT))) {
                common->len += 2; /* EML capabilities */
                ml_elem->control |=
                        cpu_to_le16(IEEE80211_MLC_BASIC_PRES_EML_CAPA);
                skb_put_data(skb, &eml_capa, sizeof(eml_capa));
        }
        skb_put_data(skb, &mld_capa_ops, sizeof(mld_capa_ops));

        if (assoc_data->ext_mld_capa_ops) {
                ml_elem->control |=
                        cpu_to_le16(IEEE80211_MLC_BASIC_PRES_EXT_MLD_CAPA_OP);
                common->len += 2;
                skb_put_data(skb, &assoc_data->ext_mld_capa_ops,
                             sizeof(assoc_data->ext_mld_capa_ops));
        }

        for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
                u16 link_present_elems[PRESENT_ELEMS_MAX] = {};
                const u8 *extra_elems;
                size_t extra_elems_len;
                size_t extra_used;
                u8 *subelem_len = NULL;
                __le16 ctrl;

                if (!assoc_data->link[link_id].bss ||
                    link_id == assoc_data->assoc_link_id)
                        continue;

                extra_elems = assoc_data->link[link_id].elems;
                extra_elems_len = assoc_data->link[link_id].elems_len;

                skb_put_u8(skb, IEEE80211_MLE_SUBELEM_PER_STA_PROFILE);
                subelem_len = skb_put(skb, 1);

                ctrl = cpu_to_le16(link_id |
                                   IEEE80211_MLE_STA_CONTROL_COMPLETE_PROFILE |
                                   IEEE80211_MLE_STA_CONTROL_STA_MAC_ADDR_PRESENT);
                skb_put_data(skb, &ctrl, sizeof(ctrl));
                skb_put_u8(skb, 1 + ETH_ALEN); /* STA Info Length */
                skb_put_data(skb, assoc_data->link[link_id].addr,
                             ETH_ALEN);
                /*
                 * Now add the contents of the (re)association request,
                 * but the "listen interval" and "current AP address"
                 * (if applicable) are skipped. So we only have
                 * the capability field (remember the position and fill
                 * later), followed by the elements added below by
                 * calling ieee80211_add_link_elems().
                 */
                capab_pos = skb_put(skb, 2);

                extra_used = ieee80211_add_link_elems(sdata, skb, &capab,
                                                      ext_capa,
                                                      extra_elems,
                                                      extra_elems_len,
                                                      link_id, NULL,
                                                      link_present_elems,
                                                      assoc_data);
                if (extra_elems)
                        skb_put_data(skb, extra_elems + extra_used,
                                     extra_elems_len - extra_used);

                put_unaligned_le16(capab, capab_pos);

                ieee80211_add_non_inheritance_elem(skb, outer_present_elems,
                                                   link_present_elems);

                ieee80211_fragment_element(skb, subelem_len,
                                           IEEE80211_MLE_SUBELEM_FRAGMENT);
        }

        ieee80211_fragment_element(skb, ml_elem_len, WLAN_EID_FRAGMENT);
}

static int
ieee80211_link_common_elems_size(struct ieee80211_sub_if_data *sdata,
                                 enum nl80211_iftype iftype,
                                 struct cfg80211_bss *cbss,
                                 size_t elems_len)
{
        struct ieee80211_local *local = sdata->local;
        const struct ieee80211_sband_iftype_data *iftd;
        struct ieee80211_supported_band *sband;
        size_t size = 0;

        if (!cbss)
                return size;

        sband = local->hw.wiphy->bands[cbss->channel->band];

        /* add STA profile elements length */
        size += elems_len;

        /* and supported rates length */
        size += 4 + sband->n_bitrates;

        /* supported channels */
        size += 2 + 2 * sband->n_channels;

        iftd = ieee80211_get_sband_iftype_data(sband, iftype);
        if (iftd)
                size += iftd->vendor_elems.len;

        /* power capability */
        size += 4;

        /* HT, VHT, HE, EHT */
        size += 2 + sizeof(struct ieee80211_ht_cap);
        size += 2 + sizeof(struct ieee80211_vht_cap);
        size += 2 + 1 + sizeof(struct ieee80211_he_cap_elem) +
                sizeof(struct ieee80211_he_mcs_nss_supp) +
                IEEE80211_HE_PPE_THRES_MAX_LEN;

        if (sband->band == NL80211_BAND_6GHZ) {
                size += 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa);
                /* reg connection */
                size += 4;
        }

        size += 2 + 1 + sizeof(struct ieee80211_eht_cap_elem) +
                sizeof(struct ieee80211_eht_mcs_nss_supp) +
                IEEE80211_EHT_PPE_THRES_MAX_LEN;

        size += 2 + 1 + sizeof(struct ieee80211_uhr_cap) +
                sizeof(struct ieee80211_uhr_cap_phy);

        return size;
}

static int ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
        struct ieee80211_link_data *link;
        struct sk_buff *skb;
        struct ieee80211_mgmt *mgmt;
        u8 *pos, qos_info, *ie_start;
        size_t offset, noffset;
        u16 capab = 0, link_capab;
        __le16 listen_int;
        struct element *ext_capa = NULL;
        enum nl80211_iftype iftype = ieee80211_vif_type_p2p(&sdata->vif);
        struct ieee80211_prep_tx_info info = {};
        unsigned int link_id, n_links = 0;
        u16 present_elems[PRESENT_ELEMS_MAX] = {};
        struct sta_info *sta;
        bool assoc_encrypt;
        void *capab_pos;
        size_t size;
        int ret;

        /* we know it's writable, cast away the const */
        if (assoc_data->ie_len)
                ext_capa = (void *)cfg80211_find_elem(WLAN_EID_EXT_CAPABILITY,
                                                      assoc_data->ie,
                                                      assoc_data->ie_len);

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        size = local->hw.extra_tx_headroom +
               sizeof(*mgmt) + /* bit too much but doesn't matter */
               2 + assoc_data->ssid_len + /* SSID */
               assoc_data->ie_len + /* extra IEs */
               (assoc_data->fils_kek_len ? 16 /* AES-SIV */ : 0) +
               9; /* WMM */

        for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
                struct cfg80211_bss *cbss = assoc_data->link[link_id].bss;
                size_t elems_len = assoc_data->link[link_id].elems_len;

                if (!cbss)
                        continue;

                n_links++;

                size += ieee80211_link_common_elems_size(sdata, iftype, cbss,
                                                         elems_len);

                /* non-inheritance element */
                size += 2 + 2 + PRESENT_ELEMS_MAX;

                /* should be the same across all BSSes */
                if (cbss->capability & WLAN_CAPABILITY_PRIVACY)
                        capab |= WLAN_CAPABILITY_PRIVACY;
        }

        if (ieee80211_vif_is_mld(&sdata->vif)) {
                /* consider the multi-link element with STA profile */
                size += sizeof(struct ieee80211_multi_link_elem);
                /* max common info field in basic multi-link element */
                size += sizeof(struct ieee80211_mle_basic_common_info) +
                        2 + /* capa & op */
                        2 + /* ext capa & op */
                        2; /* EML capa */

                /* The capability elements were already considered above */
                size += (n_links - 1) *
                        (1 + 1 + /* subelement ID/length */
                         2 + /* STA control */
                         1 + ETH_ALEN + 2 /* STA Info field */);
        }

        link = sdata_dereference(sdata->link[assoc_data->assoc_link_id], sdata);
        if (WARN_ON(!link))
                return -EINVAL;

        if (WARN_ON(!assoc_data->link[assoc_data->assoc_link_id].bss))
                return -EINVAL;

        skb = alloc_skb(size, GFP_KERNEL);
        if (!skb)
                return -ENOMEM;

        skb_reserve(skb, local->hw.extra_tx_headroom);

        if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
                capab |= WLAN_CAPABILITY_RADIO_MEASURE;

        /* Set MBSSID support for HE AP if needed */
        if (ieee80211_hw_check(&local->hw, SUPPORTS_ONLY_HE_MULTI_BSSID) &&
            link->u.mgd.conn.mode >= IEEE80211_CONN_MODE_HE &&
            ext_capa && ext_capa->datalen >= 3)
                ext_capa->data[2] |= WLAN_EXT_CAPA3_MULTI_BSSID_SUPPORT;

        mgmt = skb_put_zero(skb, 24);
        memcpy(mgmt->da, sdata->vif.cfg.ap_addr, ETH_ALEN);
        memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
        memcpy(mgmt->bssid, sdata->vif.cfg.ap_addr, ETH_ALEN);

        listen_int = cpu_to_le16(assoc_data->s1g ?
                        ieee80211_encode_usf(local->hw.conf.listen_interval) :
                        local->hw.conf.listen_interval);
        if (!is_zero_ether_addr(assoc_data->prev_ap_addr)) {
                skb_put(skb, 10);
                mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                                                  IEEE80211_STYPE_REASSOC_REQ);
                capab_pos = &mgmt->u.reassoc_req.capab_info;
                mgmt->u.reassoc_req.listen_interval = listen_int;
                memcpy(mgmt->u.reassoc_req.current_ap,
                       assoc_data->prev_ap_addr, ETH_ALEN);
                info.subtype = IEEE80211_STYPE_REASSOC_REQ;
        } else {
                skb_put(skb, 4);
                mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                                                  IEEE80211_STYPE_ASSOC_REQ);
                capab_pos = &mgmt->u.assoc_req.capab_info;
                mgmt->u.assoc_req.listen_interval = listen_int;
                info.subtype = IEEE80211_STYPE_ASSOC_REQ;
        }

        /* SSID */
        pos = skb_put(skb, 2 + assoc_data->ssid_len);
        ie_start = pos;
        *pos++ = WLAN_EID_SSID;
        *pos++ = assoc_data->ssid_len;
        memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);

        /*
         * This bit is technically reserved, so it shouldn't matter for either
         * the AP or us, but it also means we shouldn't set it. However, we've
         * always set it in the past, and apparently some EHT APs check that
         * we don't set it. To avoid interoperability issues with old APs that
         * for some reason check it and want it to be set, set the bit for all
         * pre-EHT connections as we used to do.
         */
        if (link->u.mgd.conn.mode < IEEE80211_CONN_MODE_EHT &&
            !ieee80211_hw_check(&local->hw, STRICT))
                capab |= WLAN_CAPABILITY_ESS;

        /* add the elements for the assoc (main) link */
        link_capab = capab;
        offset = ieee80211_add_link_elems(sdata, skb, &link_capab,
                                          ext_capa,
                                          assoc_data->ie,
                                          assoc_data->ie_len,
                                          assoc_data->assoc_link_id, link,
                                          present_elems, assoc_data);
        put_unaligned_le16(link_capab, capab_pos);

        /* if present, add any custom non-vendor IEs */
        if (assoc_data->ie_len) {
                noffset = ieee80211_ie_split_vendor(assoc_data->ie,
                                                    assoc_data->ie_len,
                                                    offset);
                skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
                offset = noffset;
        }

        if (assoc_data->wmm) {
                if (assoc_data->uapsd) {
                        qos_info = ifmgd->uapsd_queues;
                        qos_info |= (ifmgd->uapsd_max_sp_len <<
                                     IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
                } else {
                        qos_info = 0;
                }

                pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
        }

        /* add any remaining custom (i.e. vendor specific here) IEs */
        if (assoc_data->ie_len) {
                noffset = assoc_data->ie_len;
                skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
        }

        if (assoc_data->fils_kek_len) {
                ret = fils_encrypt_assoc_req(skb, assoc_data);
                if (ret < 0) {
                        dev_kfree_skb(skb);
                        return ret;
                }
        }

        pos = skb_tail_pointer(skb);
        kfree(ifmgd->assoc_req_ies);
        ifmgd->assoc_req_ies = kmemdup(ie_start, pos - ie_start, GFP_ATOMIC);
        if (!ifmgd->assoc_req_ies) {
                dev_kfree_skb(skb);
                return -ENOMEM;
        }

        ifmgd->assoc_req_ies_len = pos - ie_start;

        info.link_id = assoc_data->assoc_link_id;
        drv_mgd_prepare_tx(local, sdata, &info);

        sta = sta_info_get_bss(sdata, sdata->vif.cfg.ap_addr);

        assoc_encrypt = sta && sta->sta.epp_peer &&
                        wiphy_dereference(sdata->local->hw.wiphy,
                                          sta->ptk[sta->ptk_idx]);

        if (!assoc_encrypt)
                IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;

        if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
                IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
                                                IEEE80211_TX_INTFL_MLME_CONN_TX;
        ieee80211_tx_skb(sdata, skb);

        return 0;
}

void ieee80211_send_pspoll(struct ieee80211_local *local,
                           struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_pspoll *pspoll;
        struct sk_buff *skb;

        skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
        if (!skb)
                return;

        pspoll = (struct ieee80211_pspoll *) skb->data;
        pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);

        IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
        ieee80211_tx_skb(sdata, skb);
}

void ieee80211_send_nullfunc(struct ieee80211_local *local,
                             struct ieee80211_sub_if_data *sdata,
                             bool powersave)
{
        struct sk_buff *skb;
        struct ieee80211_hdr_3addr *nullfunc;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

        skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif, -1,
                                     !ieee80211_hw_check(&local->hw,
                                                         DOESNT_SUPPORT_QOS_NDP));
        if (!skb)
                return;

        nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
        if (powersave)
                nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);

        IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
                                        IEEE80211_TX_INTFL_OFFCHAN_TX_OK;

        if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
                IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;

        if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
                IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;

        ieee80211_tx_skb(sdata, skb);
}

void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
                                   struct ieee80211_sub_if_data *sdata)
{
        struct sk_buff *skb;
        struct ieee80211_hdr *nullfunc;
        __le16 fc;

        if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
                return;

        skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
        if (!skb)
                return;

        skb_reserve(skb, local->hw.extra_tx_headroom);

        nullfunc = skb_put_zero(skb, 30);
        fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
                         IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
        nullfunc->frame_control = fc;
        memcpy(nullfunc->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN);
        memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
        memcpy(nullfunc->addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN);
        memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);

        IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
        IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
        ieee80211_tx_skb(sdata, skb);
}

/* spectrum management related things */
static void ieee80211_csa_switch_work(struct wiphy *wiphy,
                                      struct wiphy_work *work)
{
        struct ieee80211_link_data *link =
                container_of(work, struct ieee80211_link_data,
                             u.mgd.csa.switch_work.work);
        struct ieee80211_sub_if_data *sdata = link->sdata;
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        int ret;

        if (!ieee80211_sdata_running(sdata))
                return;

        lockdep_assert_wiphy(local->hw.wiphy);

        if (!ifmgd->associated)
                return;

        if (!link->conf->csa_active)
                return;

        /*
         * If the link isn't active (now), we cannot wait for beacons, won't
         * have a reserved chanctx, etc. Just switch over the chandef and
         * update cfg80211 directly.
         */
        if (!ieee80211_vif_link_active(&sdata->vif, link->link_id)) {
                struct link_sta_info *link_sta;
                struct sta_info *ap_sta;

                link->conf->chanreq = link->csa.chanreq;
                cfg80211_ch_switch_notify(sdata->dev, &link->csa.chanreq.oper,
                                          link->link_id);
                link->conf->csa_active = false;

                ap_sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr);
                if (WARN_ON(!ap_sta))
                        return;

                link_sta = wiphy_dereference(wiphy,
                                             ap_sta->link[link->link_id]);
                if (WARN_ON(!link_sta))
                        return;

                link_sta->pub->bandwidth =
                        _ieee80211_sta_cur_vht_bw(link_sta,
                                                  &link->csa.chanreq.oper);
                return;
        }

        /*
         * using reservation isn't immediate as it may be deferred until later
         * with multi-vif. once reservation is complete it will re-schedule the
         * work with no reserved_chanctx so verify chandef to check if it
         * completed successfully
         */

        if (link->reserved_chanctx) {
                /*
                 * with multi-vif csa driver may call ieee80211_csa_finish()
                 * many times while waiting for other interfaces to use their
                 * reservations
                 */
                if (link->reserved_ready)
                        return;

                ret = ieee80211_link_use_reserved_context(link);
                if (ret) {
                        link_info(link,
                                  "failed to use reserved channel context, disconnecting (err=%d)\n",
                                  ret);
                        wiphy_work_queue(sdata->local->hw.wiphy,
                                         &ifmgd->csa_connection_drop_work);
                }
                return;
        }

        if (!ieee80211_chanreq_identical(&link->conf->chanreq,
                                         &link->csa.chanreq)) {
                link_info(link,
                          "failed to finalize channel switch, disconnecting\n");
                wiphy_work_queue(sdata->local->hw.wiphy,
                                 &ifmgd->csa_connection_drop_work);
                return;
        }

        link->u.mgd.csa.waiting_bcn = true;

        /*
         * The next beacon really should always be different, so this should
         * have no effect whatsoever. However, some APs (we observed this in
         * an Asus AXE11000), the beacon after the CSA might be identical to
         * the last beacon on the old channel - in this case we'd ignore it.
         * Resetting the CRC will lead us to handle it better (albeit with a
         * disconnect, but clearly the AP is broken.)
         */
        link->u.mgd.beacon_crc_valid = false;

        /* apply new TPE restrictions immediately on the new channel */
        if (link->u.mgd.csa.ap_chandef.chan->band == NL80211_BAND_6GHZ &&
            link->u.mgd.conn.mode >= IEEE80211_CONN_MODE_HE) {
                ieee80211_rearrange_tpe(&link->u.mgd.csa.tpe,
                                        &link->u.mgd.csa.ap_chandef,
                                        &link->conf->chanreq.oper);
                if (memcmp(&link->conf->tpe, &link->u.mgd.csa.tpe,
                           sizeof(link->u.mgd.csa.tpe))) {
                        link->conf->tpe = link->u.mgd.csa.tpe;
                        ieee80211_link_info_change_notify(sdata, link,
                                                          BSS_CHANGED_TPE);
                }
        }

        /*
         * It is not necessary to reset these timers if any link does not
         * have an active CSA and that link still receives the beacons
         * when other links have active CSA.
         */
        for_each_link_data(sdata, link) {
                if (!link->conf->csa_active)
                        return;
        }

        /*
         * Reset the beacon monitor and connection monitor timers when CSA
         * is active for all links in MLO when channel switch occurs in all
         * the links.
         */
        ieee80211_sta_reset_beacon_monitor(sdata);
        ieee80211_sta_reset_conn_monitor(sdata);
}

static void ieee80211_chswitch_post_beacon(struct ieee80211_link_data *link)
{
        struct ieee80211_sub_if_data *sdata = link->sdata;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        int ret;

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        WARN_ON(!link->conf->csa_active);

        ieee80211_vif_unblock_queues_csa(sdata);

        link->conf->csa_active = false;
        link->u.mgd.csa.blocked_tx = false;
        link->u.mgd.csa.waiting_bcn = false;

        ret = drv_post_channel_switch(link);
        if (ret) {
                link_info(link,
                          "driver post channel switch failed, disconnecting\n");
                wiphy_work_queue(sdata->local->hw.wiphy,
                                 &ifmgd->csa_connection_drop_work);
                return;
        }

        cfg80211_ch_switch_notify(sdata->dev, &link->conf->chanreq.oper,
                                  link->link_id);
}

void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success,
                             unsigned int link_id)
{
        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

        trace_api_chswitch_done(sdata, success, link_id);

        rcu_read_lock();

        if (!success) {
                sdata_info(sdata,
                           "driver channel switch failed (link %d), disconnecting\n",
                           link_id);
                wiphy_work_queue(sdata->local->hw.wiphy,
                                 &sdata->u.mgd.csa_connection_drop_work);
        } else {
                struct ieee80211_link_data *link =
                        rcu_dereference(sdata->link[link_id]);

                if (WARN_ON(!link)) {
                        rcu_read_unlock();
                        return;
                }

                wiphy_hrtimer_work_queue(sdata->local->hw.wiphy,
                                         &link->u.mgd.csa.switch_work, 0);
        }

        rcu_read_unlock();
}
EXPORT_SYMBOL(ieee80211_chswitch_done);

static void
ieee80211_sta_abort_chanswitch(struct ieee80211_link_data *link)
{
        struct ieee80211_sub_if_data *sdata = link->sdata;
        struct ieee80211_local *local = sdata->local;

        lockdep_assert_wiphy(local->hw.wiphy);

        if (!local->ops->abort_channel_switch)
                return;

        if (rcu_access_pointer(link->conf->chanctx_conf))
                ieee80211_link_unreserve_chanctx(link);

        ieee80211_vif_unblock_queues_csa(sdata);

        link->conf->csa_active = false;
        link->u.mgd.csa.blocked_tx = false;

        drv_abort_channel_switch(link);
}

struct sta_csa_rnr_iter_data {
        struct ieee80211_link_data *link;
        struct ieee80211_channel *chan;
        u8 mld_id;
};

static enum cfg80211_rnr_iter_ret
ieee80211_sta_csa_rnr_iter(void *_data, u8 type,
                           const struct ieee80211_neighbor_ap_info *info,
                           const u8 *tbtt_info, u8 tbtt_info_len)
{
        struct sta_csa_rnr_iter_data *data = _data;
        struct ieee80211_link_data *link = data->link;
        struct ieee80211_sub_if_data *sdata = link->sdata;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        const struct ieee80211_tbtt_info_ge_11 *ti;
        enum nl80211_band band;
        unsigned int center_freq;
        int link_id;

        if (type != IEEE80211_TBTT_INFO_TYPE_TBTT)
                return RNR_ITER_CONTINUE;

        if (tbtt_info_len < sizeof(*ti))
                return RNR_ITER_CONTINUE;

        ti = (const void *)tbtt_info;

        if (ti->mld_params.mld_id != data->mld_id)
                return RNR_ITER_CONTINUE;

        link_id = le16_get_bits(ti->mld_params.params,
                                IEEE80211_RNR_MLD_PARAMS_LINK_ID);
        if (link_id != data->link->link_id)
                return RNR_ITER_CONTINUE;

        /* we found the entry for our link! */

        /* this AP is confused, it had this right before ... just disconnect */
        if (!ieee80211_operating_class_to_band(info->op_class, &band)) {
                link_info(link,
                          "AP now has invalid operating class in RNR, disconnect\n");
                wiphy_work_queue(sdata->local->hw.wiphy,
                                 &ifmgd->csa_connection_drop_work);
                return RNR_ITER_BREAK;
        }

        center_freq = ieee80211_channel_to_frequency(info->channel, band);
        data->chan = ieee80211_get_channel(sdata->local->hw.wiphy, center_freq);

        return RNR_ITER_BREAK;
}

static void
ieee80211_sta_other_link_csa_disappeared(struct ieee80211_link_data *link,
                                         struct ieee802_11_elems *elems)
{
        struct ieee80211_sub_if_data *sdata = link->sdata;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct sta_csa_rnr_iter_data data = {
                .link = link,
        };

        /*
         * If we get here, we see a beacon from another link without
         * CSA still being reported for it, so now we have to check
         * if the CSA was aborted or completed. This may not even be
         * perfectly possible if the CSA was only done for changing
         * the puncturing, but in that case if the link in inactive
         * we don't really care, and if it's an active link (or when
         * it's activated later) we'll get a beacon and adjust.
         */

        if (WARN_ON(!elems->ml_basic))
                return;

        data.mld_id = ieee80211_mle_get_mld_id((const void *)elems->ml_basic);

        /*
         * So in order to do this, iterate the RNR element(s) and see
         * what channel is reported now.
         */
        cfg80211_iter_rnr(elems->ie_start, elems->total_len,
                          ieee80211_sta_csa_rnr_iter, &data);

        if (!data.chan) {
                link_info(link,
                          "couldn't find (valid) channel in RNR for CSA, disconnect\n");
                wiphy_work_queue(sdata->local->hw.wiphy,
                                 &ifmgd->csa_connection_drop_work);
                return;
        }

        /*
         * If it doesn't match the CSA, then assume it aborted. This
         * may erroneously detect that it was _not_ aborted when it
         * was in fact aborted, but only changed the bandwidth or the
         * puncturing configuration, but we don't have enough data to
         * detect that.
         */
        if (data.chan != link->csa.chanreq.oper.chan)
                ieee80211_sta_abort_chanswitch(link);
}

enum ieee80211_csa_source {
        IEEE80211_CSA_SOURCE_BEACON,
        IEEE80211_CSA_SOURCE_OTHER_LINK,
        IEEE80211_CSA_SOURCE_PROT_ACTION,
        IEEE80211_CSA_SOURCE_UNPROT_ACTION,
};

static void
ieee80211_sta_process_chanswitch(struct ieee80211_link_data *link,
                                 u64 timestamp, u32 device_timestamp,
                                 struct ieee802_11_elems *full_elems,
                                 struct ieee802_11_elems *csa_elems,
                                 enum ieee80211_csa_source source)
{
        struct ieee80211_sub_if_data *sdata = link->sdata;
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct ieee80211_chanctx *chanctx = NULL;
        struct ieee80211_chanctx_conf *conf;
        struct ieee80211_csa_ie csa_ie = {};
        struct ieee80211_channel_switch ch_switch = {
                .link_id = link->link_id,
                .timestamp = timestamp,
                .device_timestamp = device_timestamp,
        };
        u32 csa_time_tu;
        ktime_t now;
        int res;

        lockdep_assert_wiphy(local->hw.wiphy);

        if (csa_elems) {
                struct cfg80211_bss *cbss = link->conf->bss;
                enum nl80211_band current_band;
                struct ieee80211_bss *bss;

                if (WARN_ON(!cbss))
                        return;

                current_band = cbss->channel->band;
                bss = (void *)cbss->priv;

                res = ieee80211_parse_ch_switch_ie(sdata, csa_elems,
                                                   current_band,
                                                   bss->vht_cap_info,
                                                   &link->u.mgd.conn,
                                                   link->u.mgd.bssid,
                                                   source == IEEE80211_CSA_SOURCE_UNPROT_ACTION,
                                                   &csa_ie);
                if (res == 0) {
                        ch_switch.block_tx = csa_ie.mode;
                        ch_switch.chandef = csa_ie.chanreq.oper;
                        ch_switch.count = csa_ie.count;
                        ch_switch.delay = csa_ie.max_switch_time;
                }

                link->u.mgd.csa.tpe = csa_elems->csa_tpe;
        } else {
                /*
                 * If there was no per-STA profile for this link, we
                 * get called with csa_elems == NULL. This of course means
                 * there are no CSA elements, so set res=1 indicating
                 * no more CSA.
                 */
                res = 1;
        }

        if (res < 0) {
                /* ignore this case, not a protected frame */
                if (source == IEEE80211_CSA_SOURCE_UNPROT_ACTION)
                        return;
                goto drop_connection;
        }

        if (link->conf->csa_active) {
                switch (source) {
                case IEEE80211_CSA_SOURCE_PROT_ACTION:
                case IEEE80211_CSA_SOURCE_UNPROT_ACTION:
                        /* already processing - disregard action frames */
                        return;
                case IEEE80211_CSA_SOURCE_BEACON:
                        if (link->u.mgd.csa.waiting_bcn) {
                                ieee80211_chswitch_post_beacon(link);
                                /*
                                 * If the CSA is still present after the switch
                                 * we need to consider it as a new CSA (possibly
                                 * to self). This happens by not returning here
                                 * so we'll get to the check below.
                                 */
                        } else if (res) {
                                ieee80211_sta_abort_chanswitch(link);
                                return;
                        } else {
                                drv_channel_switch_rx_beacon(sdata, &ch_switch);
                                return;
                        }
                        break;
                case IEEE80211_CSA_SOURCE_OTHER_LINK:
                        /* active link: we want to see the beacon to continue */
                        if (ieee80211_vif_link_active(&sdata->vif,
                                                      link->link_id))
                                return;

                        /* switch work ran, so just complete the process */
                        if (link->u.mgd.csa.waiting_bcn) {
                                ieee80211_chswitch_post_beacon(link);
                                /*
                                 * If the CSA is still present after the switch
                                 * we need to consider it as a new CSA (possibly
                                 * to self). This happens by not returning here
                                 * so we'll get to the check below.
                                 */
                                break;
                        }

                        /* link still has CSA but we already know, do nothing */
                        if (!res)
                                return;

                        /* check in the RNR if the CSA aborted */
                        ieee80211_sta_other_link_csa_disappeared(link,
                                                                 full_elems);
                        return;
                }
        }

        /* no active CSA nor a new one */
        if (res) {
                /*
                 * However, we may have stopped queues when receiving a public
                 * action frame that couldn't be protected, if it had the quiet
                 * bit set. This is a trade-off, we want to be quiet as soon as
                 * possible, but also don't trust the public action frame much,
                 * as it can't be protected.
                 */
                if (unlikely(link->u.mgd.csa.blocked_tx)) {
                        link->u.mgd.csa.blocked_tx = false;
                        ieee80211_vif_unblock_queues_csa(sdata);
                }
                return;
        }

        /*
         * We don't really trust public action frames, but block queues (go to
         * quiet mode) for them anyway, we should get a beacon soon to either
         * know what the CSA really is, or figure out the public action frame
         * was actually an attack.
         */
        if (source == IEEE80211_CSA_SOURCE_UNPROT_ACTION) {
                if (csa_ie.mode) {
                        link->u.mgd.csa.blocked_tx = true;
                        ieee80211_vif_block_queues_csa(sdata);
                }
                return;
        }

        if (link->conf->chanreq.oper.chan->band !=
            csa_ie.chanreq.oper.chan->band) {
                link_info(link,
                          "AP %pM switches to different band (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
                          link->u.mgd.bssid,
                          csa_ie.chanreq.oper.chan->center_freq,
                          csa_ie.chanreq.oper.width,
                          csa_ie.chanreq.oper.center_freq1,
                          csa_ie.chanreq.oper.center_freq2);
                goto drop_connection;
        }

        if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chanreq.oper,
                                     IEEE80211_CHAN_DISABLED)) {
                link_info(link,
                          "AP %pM switches to unsupported channel (%d.%03d MHz, width:%d, CF1/2: %d.%03d/%d MHz), disconnecting\n",
                          link->u.mgd.bssid,
                          csa_ie.chanreq.oper.chan->center_freq,
                          csa_ie.chanreq.oper.chan->freq_offset,
                          csa_ie.chanreq.oper.width,
                          csa_ie.chanreq.oper.center_freq1,
                          csa_ie.chanreq.oper.freq1_offset,
                          csa_ie.chanreq.oper.center_freq2);
                goto drop_connection;
        }

        if (cfg80211_chandef_identical(&csa_ie.chanreq.oper,
                                       &link->conf->chanreq.oper) &&
            (!csa_ie.mode || source != IEEE80211_CSA_SOURCE_BEACON)) {
                if (link->u.mgd.csa.ignored_same_chan)
                        return;
                link_info(link,
                          "AP %pM tries to chanswitch to same channel, ignore\n",
                          link->u.mgd.bssid);
                link->u.mgd.csa.ignored_same_chan = true;
                return;
        }

        /*
         * Drop all TDLS peers on the affected link - either we disconnect or
         * move to a different channel from this point on. There's no telling
         * what our peer will do.
         * The TDLS WIDER_BW scenario is also problematic, as peers might now
         * have an incompatible wider chandef.
         */
        ieee80211_teardown_tdls_peers(link);

        conf = rcu_dereference_protected(link->conf->chanctx_conf,
                                         lockdep_is_held(&local->hw.wiphy->mtx));
        if (ieee80211_vif_link_active(&sdata->vif, link->link_id) && !conf) {
                link_info(link,
                          "no channel context assigned to vif?, disconnecting\n");
                goto drop_connection;
        }

        if (conf)
                chanctx = container_of(conf, struct ieee80211_chanctx, conf);

        if (!ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
                link_info(link,
                          "driver doesn't support chan-switch with channel contexts\n");
                goto drop_connection;
        }

        if (drv_pre_channel_switch(sdata, &ch_switch)) {
                link_info(link,
                          "preparing for channel switch failed, disconnecting\n");
                goto drop_connection;
        }

        link->u.mgd.csa.ap_chandef = csa_ie.chanreq.ap;

        link->csa.chanreq.oper = csa_ie.chanreq.oper;
        ieee80211_set_chanreq_ap(sdata, &link->csa.chanreq, &link->u.mgd.conn,
                                 &csa_ie.chanreq.ap);

        if (chanctx) {
                res = ieee80211_link_reserve_chanctx(link, &link->csa.chanreq,
                                                     chanctx->mode, false);
                if (res) {
                        link_info(link,
                                  "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
                                  res);
                        goto drop_connection;
                }
        }

        link->conf->csa_active = true;
        link->u.mgd.csa.ignored_same_chan = false;
        link->u.mgd.beacon_crc_valid = false;
        link->u.mgd.csa.blocked_tx = csa_ie.mode;

        if (csa_ie.mode)
                ieee80211_vif_block_queues_csa(sdata);

        cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chanreq.oper,
                                          link->link_id, csa_ie.count,
                                          csa_ie.mode);

        /* we may have to handle timeout for deactivated link in software */
        now = ktime_get_boottime();
        csa_time_tu = (max_t(int, csa_ie.count, 1) - 1) * link->conf->beacon_int;
        link->u.mgd.csa.time = now + us_to_ktime(ieee80211_tu_to_usec(csa_time_tu));

        if (ieee80211_vif_link_active(&sdata->vif, link->link_id) &&
            local->ops->channel_switch) {
                /*
                 * Use driver's channel switch callback, the driver will
                 * later call ieee80211_chswitch_done(). It may deactivate
                 * the link as well, we handle that elsewhere and queue
                 * the csa.switch_work for the calculated time then.
                 */
                drv_channel_switch(local, sdata, &ch_switch);
                return;
        }

        /* channel switch handled in software */
        wiphy_hrtimer_work_queue(local->hw.wiphy,
                                 &link->u.mgd.csa.switch_work,
                                 link->u.mgd.csa.time - now);
        return;
 drop_connection:
        /*
         * This is just so that the disconnect flow will know that
         * we were trying to switch channel and failed. In case the
         * mode is 1 (we are not allowed to Tx), we will know not to
         * send a deauthentication frame. Those two fields will be
         * reset when the disconnection worker runs.
         */
        link->conf->csa_active = true;
        link->u.mgd.csa.blocked_tx = csa_ie.mode;

        wiphy_work_queue(sdata->local->hw.wiphy,
                         &ifmgd->csa_connection_drop_work);
}

struct sta_bss_param_ch_cnt_data {
        struct ieee80211_sub_if_data *sdata;
        u8 reporting_link_id;
        u8 mld_id;
};

static enum cfg80211_rnr_iter_ret
ieee80211_sta_bss_param_ch_cnt_iter(void *_data, u8 type,
                                    const struct ieee80211_neighbor_ap_info *info,
                                    const u8 *tbtt_info, u8 tbtt_info_len)
{
        struct sta_bss_param_ch_cnt_data *data = _data;
        struct ieee80211_sub_if_data *sdata = data->sdata;
        const struct ieee80211_tbtt_info_ge_11 *ti;
        u8 bss_param_ch_cnt;
        int link_id;

        if (type != IEEE80211_TBTT_INFO_TYPE_TBTT)
                return RNR_ITER_CONTINUE;

        if (tbtt_info_len < sizeof(*ti))
                return RNR_ITER_CONTINUE;

        ti = (const void *)tbtt_info;

        if (ti->mld_params.mld_id != data->mld_id)
                return RNR_ITER_CONTINUE;

        link_id = le16_get_bits(ti->mld_params.params,
                                IEEE80211_RNR_MLD_PARAMS_LINK_ID);
        bss_param_ch_cnt =
                le16_get_bits(ti->mld_params.params,
                              IEEE80211_RNR_MLD_PARAMS_BSS_CHANGE_COUNT);

        if (bss_param_ch_cnt != 255 &&
            link_id < ARRAY_SIZE(sdata->link)) {
                struct ieee80211_link_data *link =
                        sdata_dereference(sdata->link[link_id], sdata);

                if (link && link->conf->bss_param_ch_cnt != bss_param_ch_cnt) {
                        link->conf->bss_param_ch_cnt = bss_param_ch_cnt;
                        link->conf->bss_param_ch_cnt_link_id =
                                data->reporting_link_id;
                }
        }

        return RNR_ITER_CONTINUE;
}

static void
ieee80211_mgd_update_bss_param_ch_cnt(struct ieee80211_sub_if_data *sdata,
                                      struct ieee80211_bss_conf *bss_conf,
                                      struct ieee802_11_elems *elems)
{
        struct sta_bss_param_ch_cnt_data data = {
                .reporting_link_id = bss_conf->link_id,
                .sdata = sdata,
        };
        int bss_param_ch_cnt;

        if (!elems->ml_basic)
                return;

        data.mld_id = ieee80211_mle_get_mld_id((const void *)elems->ml_basic);

        cfg80211_iter_rnr(elems->ie_start, elems->total_len,
                          ieee80211_sta_bss_param_ch_cnt_iter, &data);

        bss_param_ch_cnt =
                ieee80211_mle_get_bss_param_ch_cnt((const void *)elems->ml_basic);

        /*
         * Update bss_param_ch_cnt_link_id even if bss_param_ch_cnt
         * didn't change to indicate that we got a beacon on our own
         * link.
         */
        if (bss_param_ch_cnt >= 0 && bss_param_ch_cnt != 255) {
                bss_conf->bss_param_ch_cnt = bss_param_ch_cnt;
                bss_conf->bss_param_ch_cnt_link_id =
                        bss_conf->link_id;
        }
}

static bool
ieee80211_find_80211h_pwr_constr(struct ieee80211_channel *channel,
                                 const u8 *country_ie, u8 country_ie_len,
                                 const u8 *pwr_constr_elem,
                                 int *chan_pwr, int *pwr_reduction)
{
        struct ieee80211_country_ie_triplet *triplet;
        int chan = ieee80211_frequency_to_channel(channel->center_freq);
        int i, chan_increment;
        bool have_chan_pwr = false;

        /* Invalid IE */
        if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
                return false;

        triplet = (void *)(country_ie + 3);
        country_ie_len -= 3;

        switch (channel->band) {
        default:
                WARN_ON_ONCE(1);
                fallthrough;
        case NL80211_BAND_2GHZ:
        case NL80211_BAND_60GHZ:
        case NL80211_BAND_LC:
                chan_increment = 1;
                break;
        case NL80211_BAND_5GHZ:
                chan_increment = 4;
                break;
        case NL80211_BAND_6GHZ:
                /*
                 * In the 6 GHz band, the "maximum transmit power level"
                 * field in the triplets is reserved, and thus will be
                 * zero and we shouldn't use it to control TX power.
                 * The actual TX power will be given in the transmit
                 * power envelope element instead.
                 */
                return false;
        }

        /* find channel */
        while (country_ie_len >= 3) {
                u8 first_channel = triplet->chans.first_channel;

                if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
                        goto next;

                for (i = 0; i < triplet->chans.num_channels; i++) {
                        if (first_channel + i * chan_increment == chan) {
                                have_chan_pwr = true;
                                *chan_pwr = triplet->chans.max_power;
                                break;
                        }
                }
                if (have_chan_pwr)
                        break;

 next:
                triplet++;
                country_ie_len -= 3;
        }

        if (have_chan_pwr && pwr_constr_elem)
                *pwr_reduction = *pwr_constr_elem;
        else
                *pwr_reduction = 0;

        return have_chan_pwr;
}

static void ieee80211_find_cisco_dtpc(struct ieee80211_channel *channel,
                                      const u8 *cisco_dtpc_ie,
                                      int *pwr_level)
{
        /* From practical testing, the first data byte of the DTPC element
         * seems to contain the requested dBm level, and the CLI on Cisco
         * APs clearly state the range is -127 to 127 dBm, which indicates
         * a signed byte, although it seemingly never actually goes negative.
         * The other byte seems to always be zero.
         */
        *pwr_level = (__s8)cisco_dtpc_ie[4];
}

static u64 ieee80211_handle_pwr_constr(struct ieee80211_link_data *link,
                                       struct ieee80211_channel *channel,
                                       struct ieee80211_mgmt *mgmt,
                                       const u8 *country_ie, u8 country_ie_len,
                                       const u8 *pwr_constr_ie,
                                       const u8 *cisco_dtpc_ie)
{
        struct ieee80211_sub_if_data *sdata = link->sdata;
        bool has_80211h_pwr = false, has_cisco_pwr = false;
        int chan_pwr = 0, pwr_reduction_80211h = 0;
        int pwr_level_cisco, pwr_level_80211h;
        int new_ap_level;
        __le16 capab = mgmt->u.probe_resp.capab_info;

        if (ieee80211_is_s1g_beacon(mgmt->frame_control))
                return 0;       /* TODO */

        if (country_ie &&
            (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
             capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
                has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
                        channel, country_ie, country_ie_len,
                        pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
                pwr_level_80211h =
                        max_t(int, 0, chan_pwr - pwr_reduction_80211h);
        }

        if (cisco_dtpc_ie) {
                ieee80211_find_cisco_dtpc(
                        channel, cisco_dtpc_ie, &pwr_level_cisco);
                has_cisco_pwr = true;
        }

        if (!has_80211h_pwr && !has_cisco_pwr)
                return 0;

        /* If we have both 802.11h and Cisco DTPC, apply both limits
         * by picking the smallest of the two power levels advertised.
         */
        if (has_80211h_pwr &&
            (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
                new_ap_level = pwr_level_80211h;

                if (link->ap_power_level == new_ap_level)
                        return 0;

                sdata_dbg(sdata,
                          "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
                          pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
                          link->u.mgd.bssid);
        } else {  /* has_cisco_pwr is always true here. */
                new_ap_level = pwr_level_cisco;

                if (link->ap_power_level == new_ap_level)
                        return 0;

                sdata_dbg(sdata,
                          "Limiting TX power to %d dBm as advertised by %pM\n",
                          pwr_level_cisco, link->u.mgd.bssid);
        }

        link->ap_power_level = new_ap_level;
        if (__ieee80211_recalc_txpower(link))
                return BSS_CHANGED_TXPOWER;
        return 0;
}

/* powersave */
static void ieee80211_enable_ps(struct ieee80211_local *local,
                                struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_conf *conf = &local->hw.conf;

        /*
         * If we are scanning right now then the parameters will
         * take effect when scan finishes.
         */
        if (local->scanning)
                return;

        if (conf->dynamic_ps_timeout > 0 &&
            !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
                mod_timer(&local->dynamic_ps_timer, jiffies +
                          msecs_to_jiffies(conf->dynamic_ps_timeout));
        } else {
                if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
                        ieee80211_send_nullfunc(local, sdata, true);

                if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
                    ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
                        return;

                conf->flags |= IEEE80211_CONF_PS;
                ieee80211_hw_config(local, -1, IEEE80211_CONF_CHANGE_PS);
        }
}

static void ieee80211_change_ps(struct ieee80211_local *local)
{
        struct ieee80211_conf *conf = &local->hw.conf;

        if (local->ps_sdata) {
                ieee80211_enable_ps(local, local->ps_sdata);
        } else if (conf->flags & IEEE80211_CONF_PS) {
                conf->flags &= ~IEEE80211_CONF_PS;
                ieee80211_hw_config(local, -1, IEEE80211_CONF_CHANGE_PS);
                timer_delete_sync(&local->dynamic_ps_timer);
                wiphy_work_cancel(local->hw.wiphy,
                                  &local->dynamic_ps_enable_work);
        }
}

static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *mgd = &sdata->u.mgd;
        struct sta_info *sta = NULL;
        bool authorized = false;

        if (!mgd->powersave)
                return false;

        if (mgd->broken_ap)
                return false;

        if (!mgd->associated)
                return false;

        if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
                return false;

        if (!(local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_MLO) &&
            !sdata->deflink.u.mgd.have_beacon)
                return false;

        rcu_read_lock();
        sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr);
        if (sta)
                authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
        rcu_read_unlock();

        return authorized;
}

/* need to hold RTNL or interface lock */
void ieee80211_recalc_ps(struct ieee80211_local *local)
{
        struct ieee80211_sub_if_data *sdata, *found = NULL;
        int count = 0;
        int timeout;

        if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS) ||
            ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
                local->ps_sdata = NULL;
                return;
        }

        list_for_each_entry(sdata, &local->interfaces, list) {
                if (!ieee80211_sdata_running(sdata))
                        continue;
                if (sdata->vif.type == NL80211_IFTYPE_AP) {
                        /* If an AP vif is found, then disable PS
                         * by setting the count to zero thereby setting
                         * ps_sdata to NULL.
                         */
                        count = 0;
                        break;
                }
                if (sdata->vif.type != NL80211_IFTYPE_STATION)
                        continue;
                found = sdata;
                count++;
        }

        if (count == 1 && ieee80211_powersave_allowed(found)) {
                u8 dtimper = found->deflink.u.mgd.dtim_period;

                timeout = local->dynamic_ps_forced_timeout;
                if (timeout < 0)
                        timeout = 100;
                local->hw.conf.dynamic_ps_timeout = timeout;

                /* If the TIM IE is invalid, pretend the value is 1 */
                if (!dtimper)
                        dtimper = 1;

                local->hw.conf.ps_dtim_period = dtimper;
                local->ps_sdata = found;
        } else {
                local->ps_sdata = NULL;
        }

        ieee80211_change_ps(local);
}

void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
{
        bool ps_allowed = ieee80211_powersave_allowed(sdata);

        if (sdata->vif.cfg.ps != ps_allowed) {
                sdata->vif.cfg.ps = ps_allowed;
                ieee80211_vif_cfg_change_notify(sdata, BSS_CHANGED_PS);
        }
}

void ieee80211_dynamic_ps_disable_work(struct wiphy *wiphy,
                                       struct wiphy_work *work)
{
        struct ieee80211_local *local =
                container_of(work, struct ieee80211_local,
                             dynamic_ps_disable_work);

        if (local->hw.conf.flags & IEEE80211_CONF_PS) {
                local->hw.conf.flags &= ~IEEE80211_CONF_PS;
                ieee80211_hw_config(local, -1, IEEE80211_CONF_CHANGE_PS);
        }

        ieee80211_wake_queues_by_reason(&local->hw,
                                        IEEE80211_MAX_QUEUE_MAP,
                                        IEEE80211_QUEUE_STOP_REASON_PS,
                                        false);
}

void ieee80211_dynamic_ps_enable_work(struct wiphy *wiphy,
                                      struct wiphy_work *work)
{
        struct ieee80211_local *local =
                container_of(work, struct ieee80211_local,
                             dynamic_ps_enable_work);
        struct ieee80211_sub_if_data *sdata = local->ps_sdata;
        struct ieee80211_if_managed *ifmgd;
        unsigned long flags;
        int q;

        /* can only happen when PS was just disabled anyway */
        if (!sdata)
                return;

        ifmgd = &sdata->u.mgd;

        if (local->hw.conf.flags & IEEE80211_CONF_PS)
                return;

        if (local->hw.conf.dynamic_ps_timeout > 0) {
                /* don't enter PS if TX frames are pending */
                if (drv_tx_frames_pending(local)) {
                        mod_timer(&local->dynamic_ps_timer, jiffies +
                                  msecs_to_jiffies(
                                  local->hw.conf.dynamic_ps_timeout));
                        return;
                }

                /*
                 * transmission can be stopped by others which leads to
                 * dynamic_ps_timer expiry. Postpone the ps timer if it
                 * is not the actual idle state.
                 */
                spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
                for (q = 0; q < local->hw.queues; q++) {
                        if (local->queue_stop_reasons[q]) {
                                spin_unlock_irqrestore(&local->queue_stop_reason_lock,
                                                       flags);
                                mod_timer(&local->dynamic_ps_timer, jiffies +
                                          msecs_to_jiffies(
                                          local->hw.conf.dynamic_ps_timeout));
                                return;
                        }
                }
                spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
        }

        if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
            !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
                if (drv_tx_frames_pending(local)) {
                        mod_timer(&local->dynamic_ps_timer, jiffies +
                                  msecs_to_jiffies(
                                  local->hw.conf.dynamic_ps_timeout));
                } else {
                        ieee80211_send_nullfunc(local, sdata, true);
                        /* Flush to get the tx status of nullfunc frame */
                        ieee80211_flush_queues(local, sdata, false);
                }
        }

        if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
              ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
            (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
                ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
                local->hw.conf.flags |= IEEE80211_CONF_PS;
                ieee80211_hw_config(local, -1, IEEE80211_CONF_CHANGE_PS);
        }
}

void ieee80211_dynamic_ps_timer(struct timer_list *t)
{
        struct ieee80211_local *local = timer_container_of(local, t,
                                                           dynamic_ps_timer);

        wiphy_work_queue(local->hw.wiphy, &local->dynamic_ps_enable_work);
}

void ieee80211_dfs_cac_timer_work(struct wiphy *wiphy, struct wiphy_work *work)
{
        struct ieee80211_link_data *link =
                container_of(work, struct ieee80211_link_data,
                             dfs_cac_timer_work.work);
        struct cfg80211_chan_def chandef = link->conf->chanreq.oper;
        struct ieee80211_sub_if_data *sdata = link->sdata;

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        if (sdata->wdev.links[link->link_id].cac_started) {
                ieee80211_link_release_channel(link);
                cfg80211_cac_event(sdata->dev, &chandef,
                                   NL80211_RADAR_CAC_FINISHED,
                                   GFP_KERNEL, link->link_id);
        }
}

static bool
__ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        bool ret = false;
        int ac;

        if (local->hw.queues < IEEE80211_NUM_ACS)
                return false;

        for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
                struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
                int non_acm_ac;
                unsigned long now = jiffies;

                if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
                    tx_tspec->admitted_time &&
                    time_after(now, tx_tspec->time_slice_start + HZ)) {
                        tx_tspec->consumed_tx_time = 0;
                        tx_tspec->time_slice_start = now;

                        if (tx_tspec->downgraded)
                                tx_tspec->action =
                                        TX_TSPEC_ACTION_STOP_DOWNGRADE;
                }

                switch (tx_tspec->action) {
                case TX_TSPEC_ACTION_STOP_DOWNGRADE:
                        /* take the original parameters */
                        if (drv_conf_tx(local, &sdata->deflink, ac,
                                        &sdata->deflink.tx_conf[ac]))
                                link_err(&sdata->deflink,
                                         "failed to set TX queue parameters for queue %d\n",
                                         ac);
                        tx_tspec->action = TX_TSPEC_ACTION_NONE;
                        tx_tspec->downgraded = false;
                        ret = true;
                        break;
                case TX_TSPEC_ACTION_DOWNGRADE:
                        if (time_after(now, tx_tspec->time_slice_start + HZ)) {
                                tx_tspec->action = TX_TSPEC_ACTION_NONE;
                                ret = true;
                                break;
                        }
                        /* downgrade next lower non-ACM AC */
                        for (non_acm_ac = ac + 1;
                             non_acm_ac < IEEE80211_NUM_ACS;
                             non_acm_ac++)
                                if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
                                        break;
                        /* Usually the loop will result in using BK even if it
                         * requires admission control, but such a configuration
                         * makes no sense and we have to transmit somehow - the
                         * AC selection does the same thing.
                         * If we started out trying to downgrade from BK, then
                         * the extra condition here might be needed.
                         */
                        if (non_acm_ac >= IEEE80211_NUM_ACS)
                                non_acm_ac = IEEE80211_AC_BK;
                        if (drv_conf_tx(local, &sdata->deflink, ac,
                                        &sdata->deflink.tx_conf[non_acm_ac]))
                                link_err(&sdata->deflink,
                                         "failed to set TX queue parameters for queue %d\n",
                                         ac);
                        tx_tspec->action = TX_TSPEC_ACTION_NONE;
                        ret = true;
                        wiphy_delayed_work_queue(local->hw.wiphy,
                                                 &ifmgd->tx_tspec_wk,
                                                 tx_tspec->time_slice_start +
                                                 HZ - now + 1);
                        break;
                case TX_TSPEC_ACTION_NONE:
                        /* nothing now */
                        break;
                }
        }

        return ret;
}

void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
{
        if (__ieee80211_sta_handle_tspec_ac_params(sdata))
                ieee80211_link_info_change_notify(sdata, &sdata->deflink,
                                                  BSS_CHANGED_QOS);
}

static void ieee80211_sta_handle_tspec_ac_params_wk(struct wiphy *wiphy,
                                                    struct wiphy_work *work)
{
        struct ieee80211_sub_if_data *sdata;

        sdata = container_of(work, struct ieee80211_sub_if_data,
                             u.mgd.tx_tspec_wk.work);
        ieee80211_sta_handle_tspec_ac_params(sdata);
}

void ieee80211_mgd_set_link_qos_params(struct ieee80211_link_data *link)
{
        struct ieee80211_sub_if_data *sdata = link->sdata;
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct ieee80211_tx_queue_params *params = link->tx_conf;
        u8 ac;

        for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
                mlme_dbg(sdata,
                         "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
                         ac, params[ac].acm,
                         params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
                         params[ac].txop, params[ac].uapsd,
                         ifmgd->tx_tspec[ac].downgraded);
                if (!ifmgd->tx_tspec[ac].downgraded &&
                    drv_conf_tx(local, link, ac, &params[ac]))
                        link_err(link,
                                 "failed to set TX queue parameters for AC %d\n",
                                 ac);
        }
}

/* MLME */
static bool
_ieee80211_sta_wmm_params(struct ieee80211_local *local,
                          struct ieee80211_link_data *link,
                          const u8 *wmm_param, size_t wmm_param_len,
                          const struct ieee80211_mu_edca_param_set *mu_edca)
{
        struct ieee80211_sub_if_data *sdata = link->sdata;
        struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        size_t left;
        int count, mu_edca_count, ac;
        const u8 *pos;
        u8 uapsd_queues = 0;

        if (!local->ops->conf_tx)
                return false;

        if (local->hw.queues < IEEE80211_NUM_ACS)
                return false;

        if (!wmm_param)
                return false;

        if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
                return false;

        if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
                uapsd_queues = ifmgd->uapsd_queues;

        count = wmm_param[6] & 0x0f;
        /* -1 is the initial value of ifmgd->mu_edca_last_param_set.
         * if mu_edca was preset before and now it disappeared tell
         * the driver about it.
         */
        mu_edca_count = mu_edca ? mu_edca->mu_qos_info & 0x0f : -1;
        if (count == link->u.mgd.wmm_last_param_set &&
            mu_edca_count == link->u.mgd.mu_edca_last_param_set)
                return false;
        link->u.mgd.wmm_last_param_set = count;
        link->u.mgd.mu_edca_last_param_set = mu_edca_count;

        pos = wmm_param + 8;
        left = wmm_param_len - 8;

        memset(&params, 0, sizeof(params));

        sdata->wmm_acm = 0;
        for (; left >= 4; left -= 4, pos += 4) {
                int aci = (pos[0] >> 5) & 0x03;
                int acm = (pos[0] >> 4) & 0x01;
                bool uapsd = false;

                switch (aci) {
                case 1: /* AC_BK */
                        ac = IEEE80211_AC_BK;
                        if (acm)
                                sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
                        if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
                                uapsd = true;
                        params[ac].mu_edca = !!mu_edca;
                        if (mu_edca)
                                params[ac].mu_edca_param_rec = mu_edca->ac_bk;
                        break;
                case 2: /* AC_VI */
                        ac = IEEE80211_AC_VI;
                        if (acm)
                                sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
                        if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
                                uapsd = true;
                        params[ac].mu_edca = !!mu_edca;
                        if (mu_edca)
                                params[ac].mu_edca_param_rec = mu_edca->ac_vi;
                        break;
                case 3: /* AC_VO */
                        ac = IEEE80211_AC_VO;
                        if (acm)
                                sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
                        if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
                                uapsd = true;
                        params[ac].mu_edca = !!mu_edca;
                        if (mu_edca)
                                params[ac].mu_edca_param_rec = mu_edca->ac_vo;
                        break;
                case 0: /* AC_BE */
                default:
                        ac = IEEE80211_AC_BE;
                        if (acm)
                                sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
                        if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
                                uapsd = true;
                        params[ac].mu_edca = !!mu_edca;
                        if (mu_edca)
                                params[ac].mu_edca_param_rec = mu_edca->ac_be;
                        break;
                }

                params[ac].aifs = pos[0] & 0x0f;

                if (params[ac].aifs < 2) {
                        link_info(link,
                                  "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
                                  params[ac].aifs, aci);
                        params[ac].aifs = 2;
                }
                params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
                params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
                params[ac].txop = get_unaligned_le16(pos + 2);
                params[ac].acm = acm;
                params[ac].uapsd = uapsd;

                if (params[ac].cw_min == 0 ||
                    params[ac].cw_min > params[ac].cw_max) {
                        link_info(link,
                                  "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
                                  params[ac].cw_min, params[ac].cw_max, aci);
                        return false;
                }
                ieee80211_regulatory_limit_wmm_params(sdata, &params[ac], ac);
        }

        /* WMM specification requires all 4 ACIs. */
        for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
                if (params[ac].cw_min == 0) {
                        link_info(link,
                                  "AP has invalid WMM params (missing AC %d), using defaults\n",
                                  ac);
                        return false;
                }
        }

        for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
                link->tx_conf[ac] = params[ac];

        return true;
}

static bool
ieee80211_sta_wmm_params(struct ieee80211_local *local,
                         struct ieee80211_link_data *link,
                         const u8 *wmm_param, size_t wmm_param_len,
                         const struct ieee80211_mu_edca_param_set *mu_edca)
{
        if (!_ieee80211_sta_wmm_params(local, link, wmm_param, wmm_param_len,
                                       mu_edca))
                return false;

        ieee80211_mgd_set_link_qos_params(link);

        /* enable WMM or activate new settings */
        link->conf->qos = true;
        return true;
}

static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
{
        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
        ieee80211_run_deferred_scan(sdata->local);
}

static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
{
        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        __ieee80211_stop_poll(sdata);
}

static u64 ieee80211_handle_bss_capability(struct ieee80211_link_data *link,
                                           u16 capab, bool erp_valid, u8 erp)
{
        struct ieee80211_bss_conf *bss_conf = link->conf;
        struct ieee80211_supported_band *sband;
        u64 changed = 0;
        bool use_protection;
        bool use_short_preamble;
        bool use_short_slot;

        sband = ieee80211_get_link_sband(link);
        if (!sband)
                return changed;

        if (erp_valid) {
                use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
                use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
        } else {
                use_protection = false;
                use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
        }

        use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
        if (sband->band == NL80211_BAND_5GHZ ||
            sband->band == NL80211_BAND_6GHZ)
                use_short_slot = true;

        if (use_protection != bss_conf->use_cts_prot) {
                bss_conf->use_cts_prot = use_protection;
                changed |= BSS_CHANGED_ERP_CTS_PROT;
        }

        if (use_short_preamble != bss_conf->use_short_preamble) {
                bss_conf->use_short_preamble = use_short_preamble;
                changed |= BSS_CHANGED_ERP_PREAMBLE;
        }

        if (use_short_slot != bss_conf->use_short_slot) {
                bss_conf->use_short_slot = use_short_slot;
                changed |= BSS_CHANGED_ERP_SLOT;
        }

        return changed;
}

static u64 ieee80211_link_set_associated(struct ieee80211_link_data *link,
                                         struct cfg80211_bss *cbss)
{
        struct ieee80211_sub_if_data *sdata = link->sdata;
        struct ieee80211_bss_conf *bss_conf = link->conf;
        struct ieee80211_bss *bss = (void *)cbss->priv;
        u64 changed = BSS_CHANGED_QOS;

        /* not really used in MLO */
        sdata->u.mgd.beacon_timeout =
                usecs_to_jiffies(ieee80211_tu_to_usec(beacon_loss_count *
                                                      bss_conf->beacon_int));

        changed |= ieee80211_handle_bss_capability(link,
                                                   bss_conf->assoc_capability,
                                                   bss->has_erp_value,
                                                   bss->erp_value);

        ieee80211_check_rate_mask(link);

        link->conf->bss = cbss;
        memcpy(link->u.mgd.bssid, cbss->bssid, ETH_ALEN);

        if (sdata->vif.p2p ||
            sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
                const struct cfg80211_bss_ies *ies;

                rcu_read_lock();
                ies = rcu_dereference(cbss->ies);
                if (ies) {
                        int ret;

                        ret = cfg80211_get_p2p_attr(
                                        ies->data, ies->len,
                                        IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
                                        (u8 *) &bss_conf->p2p_noa_attr,
                                        sizeof(bss_conf->p2p_noa_attr));
                        if (ret >= 2) {
                                link->u.mgd.p2p_noa_index =
                                        bss_conf->p2p_noa_attr.index;
                                changed |= BSS_CHANGED_P2P_PS;
                        }
                }
                rcu_read_unlock();
        }

        if (link->u.mgd.have_beacon) {
                bss_conf->beacon_rate = bss->beacon_rate;
                changed |= BSS_CHANGED_BEACON_INFO;
        } else {
                bss_conf->beacon_rate = NULL;
        }

        /* Tell the driver to monitor connection quality (if supported) */
        if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
            bss_conf->cqm_rssi_thold)
                changed |= BSS_CHANGED_CQM;

        return changed;
}

static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
                                     struct ieee80211_mgd_assoc_data *assoc_data,
                                     u64 changed[IEEE80211_MLD_MAX_NUM_LINKS])
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_vif_cfg *vif_cfg = &sdata->vif.cfg;
        u64 vif_changed = BSS_CHANGED_ASSOC;
        unsigned int link_id;

        lockdep_assert_wiphy(local->hw.wiphy);

        sdata->u.mgd.associated = true;

        for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
                struct cfg80211_bss *cbss = assoc_data->link[link_id].bss;
                struct ieee80211_link_data *link;

                if (!cbss ||
                    assoc_data->link[link_id].status != WLAN_STATUS_SUCCESS)
                        continue;

                if (ieee80211_vif_is_mld(&sdata->vif) &&
                    !(ieee80211_vif_usable_links(&sdata->vif) & BIT(link_id)))
                        continue;

                link = sdata_dereference(sdata->link[link_id], sdata);
                if (WARN_ON(!link))
                        return;

                changed[link_id] |= ieee80211_link_set_associated(link, cbss);
        }

        /* just to be sure */
        ieee80211_stop_poll(sdata);

        ieee80211_led_assoc(local, 1);

        vif_cfg->assoc = 1;

        /* Enable ARP filtering */
        if (vif_cfg->arp_addr_cnt)
                vif_changed |= BSS_CHANGED_ARP_FILTER;

        if (ieee80211_vif_is_mld(&sdata->vif)) {
                for (link_id = 0;
                     link_id < IEEE80211_MLD_MAX_NUM_LINKS;
                     link_id++) {
                        struct ieee80211_link_data *link;
                        struct cfg80211_bss *cbss = assoc_data->link[link_id].bss;

                        if (!cbss ||
                            !(BIT(link_id) &
                              ieee80211_vif_usable_links(&sdata->vif)) ||
                            assoc_data->link[link_id].status != WLAN_STATUS_SUCCESS)
                                continue;

                        link = sdata_dereference(sdata->link[link_id], sdata);
                        if (WARN_ON(!link))
                                return;

                        ieee80211_link_info_change_notify(sdata, link,
                                                          changed[link_id]);

                        ieee80211_recalc_smps(sdata, link);
                }

                ieee80211_vif_cfg_change_notify(sdata, vif_changed);
        } else {
                ieee80211_bss_info_change_notify(sdata,
                                                 vif_changed | changed[0]);
        }

        ieee80211_recalc_ps(local);

        /* leave this here to not change ordering in non-MLO cases */
        if (!ieee80211_vif_is_mld(&sdata->vif))
                ieee80211_recalc_smps(sdata, &sdata->deflink);
        ieee80211_recalc_ps_vif(sdata);

        netif_carrier_on(sdata->dev);
}

static void ieee80211_ml_reconf_reset(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_mgd_assoc_data *add_links_data =
                sdata->u.mgd.reconf.add_links_data;

        if (!ieee80211_vif_is_mld(&sdata->vif) ||
            !(sdata->u.mgd.reconf.added_links |
              sdata->u.mgd.reconf.removed_links))
                return;

        wiphy_delayed_work_cancel(sdata->local->hw.wiphy,
                                  &sdata->u.mgd.reconf.wk);
        sdata->u.mgd.reconf.added_links = 0;
        sdata->u.mgd.reconf.removed_links = 0;
        sdata->u.mgd.reconf.dialog_token = 0;

        if (add_links_data) {
                struct cfg80211_mlo_reconf_done_data done_data = {};
                u8 link_id;

                for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS;
                     link_id++)
                        done_data.links[link_id].bss =
                                add_links_data->link[link_id].bss;

                cfg80211_mlo_reconf_add_done(sdata->dev, &done_data);

                kfree(sdata->u.mgd.reconf.add_links_data);
                sdata->u.mgd.reconf.add_links_data = NULL;
        }
}

static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
                                   u16 stype, u16 reason, bool tx,
                                   u8 *frame_buf)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct ieee80211_local *local = sdata->local;
        struct sta_info *ap_sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr);
        unsigned int link_id;
        u64 changed = 0;
        struct ieee80211_prep_tx_info info = {
                .subtype = stype,
                .was_assoc = true,
                .link_id = ffs(sdata->vif.active_links) - 1,
        };

        lockdep_assert_wiphy(local->hw.wiphy);

        if (frame_buf)
                memset(frame_buf, 0, IEEE80211_DEAUTH_FRAME_LEN);

        if (WARN_ON(!ap_sta))
                return;

        if (WARN_ON_ONCE(tx && !frame_buf))
                return;

        if (WARN_ON(!ifmgd->associated))
                return;

        ieee80211_stop_poll(sdata);

        ifmgd->associated = false;

        if (tx) {
                bool tx_link_found = false;

                for (link_id = 0;
                     link_id < ARRAY_SIZE(sdata->link);
                     link_id++) {
                        struct ieee80211_link_data *link;

                        if (!ieee80211_vif_link_active(&sdata->vif, link_id))
                                continue;

                        link = sdata_dereference(sdata->link[link_id], sdata);
                        if (WARN_ON_ONCE(!link))
                                continue;

                        if (link->u.mgd.csa.blocked_tx)
                                continue;

                        tx_link_found = true;
                        break;
                }

                tx = tx_link_found;
        }

        /* other links will be destroyed */
        sdata->deflink.conf->bss = NULL;
        sdata->deflink.conf->epcs_support = false;
        sdata->deflink.smps_mode = IEEE80211_SMPS_OFF;

        netif_carrier_off(sdata->dev);

        /*
         * if we want to get out of ps before disassoc (why?) we have
         * to do it before sending disassoc, as otherwise the null-packet
         * won't be valid.
         */
        if (local->hw.conf.flags & IEEE80211_CONF_PS) {
                local->hw.conf.flags &= ~IEEE80211_CONF_PS;
                ieee80211_hw_config(local, -1, IEEE80211_CONF_CHANGE_PS);
        }
        local->ps_sdata = NULL;

        /* disable per-vif ps */
        ieee80211_recalc_ps_vif(sdata);

        /* make sure ongoing transmission finishes */
        synchronize_net();

        /*
         * drop any frame before deauth/disassoc, this can be data or
         * management frame. Since we are disconnecting, we should not
         * insist sending these frames which can take time and delay
         * the disconnection and possible the roaming.
         */
        ieee80211_flush_queues(local, sdata, true);

        if (tx) {
                drv_mgd_prepare_tx(sdata->local, sdata, &info);

                ieee80211_send_deauth_disassoc(sdata, sdata->vif.cfg.ap_addr,
                                               sdata->vif.cfg.ap_addr, stype,
                                               reason, true, frame_buf);

                /* flush out frame - make sure the deauth was actually sent */
                ieee80211_flush_queues(local, sdata, false);

                drv_mgd_complete_tx(sdata->local, sdata, &info);
        } else if (frame_buf) {
                ieee80211_send_deauth_disassoc(sdata, sdata->vif.cfg.ap_addr,
                                               sdata->vif.cfg.ap_addr, stype,
                                               reason, false, frame_buf);
        }

        /* clear AP addr only after building the needed mgmt frames */
        eth_zero_addr(sdata->deflink.u.mgd.bssid);
        eth_zero_addr(sdata->vif.cfg.ap_addr);

        sdata->vif.cfg.ssid_len = 0;

        /* Remove TDLS peers */
        __sta_info_flush(sdata, false, -1, ap_sta);

        if (sdata->vif.driver_flags & IEEE80211_VIF_REMOVE_AP_AFTER_DISASSOC) {
                /* Only move the AP state */
                sta_info_move_state(ap_sta, IEEE80211_STA_NONE);
        } else {
                /* Remove AP peer */
                sta_info_flush(sdata, -1);
        }

        /* finally reset all BSS / config parameters */
        if (!ieee80211_vif_is_mld(&sdata->vif))
                changed |= ieee80211_reset_erp_info(sdata);

        ieee80211_led_assoc(local, 0);
        changed |= BSS_CHANGED_ASSOC;
        sdata->vif.cfg.assoc = false;

        sdata->deflink.u.mgd.p2p_noa_index = -1;
        memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
               sizeof(sdata->vif.bss_conf.p2p_noa_attr));

        /* on the next assoc, re-program HT/VHT parameters */
        memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
        memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
        memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
        memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));

        /*
         * reset MU-MIMO ownership and group data in default link,
         * if used, other links are destroyed
         */
        memset(sdata->vif.bss_conf.mu_group.membership, 0,
               sizeof(sdata->vif.bss_conf.mu_group.membership));
        memset(sdata->vif.bss_conf.mu_group.position, 0,
               sizeof(sdata->vif.bss_conf.mu_group.position));
        if (!ieee80211_vif_is_mld(&sdata->vif))
                changed |= BSS_CHANGED_MU_GROUPS;
        sdata->vif.bss_conf.mu_mimo_owner = false;

        sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL;

        timer_delete_sync(&local->dynamic_ps_timer);
        wiphy_work_cancel(local->hw.wiphy, &local->dynamic_ps_enable_work);

        /* Disable ARP filtering */
        if (sdata->vif.cfg.arp_addr_cnt)
                changed |= BSS_CHANGED_ARP_FILTER;

        sdata->vif.bss_conf.qos = false;
        if (!ieee80211_vif_is_mld(&sdata->vif)) {
                changed |= BSS_CHANGED_QOS;
                /* The BSSID (not really interesting) and HT changed */
                changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
                ieee80211_bss_info_change_notify(sdata, changed);
        } else {
                ieee80211_vif_cfg_change_notify(sdata, changed);
        }

        if (sdata->vif.driver_flags & IEEE80211_VIF_REMOVE_AP_AFTER_DISASSOC) {
                /*
                 * After notifying the driver about the disassoc,
                 * remove the ap sta.
                 */
                sta_info_flush(sdata, -1);
        }

        /* disassociated - set to defaults now */
        ieee80211_set_wmm_default(&sdata->deflink, false, false);

        timer_delete_sync(&sdata->u.mgd.conn_mon_timer);
        timer_delete_sync(&sdata->u.mgd.bcn_mon_timer);
        timer_delete_sync(&sdata->u.mgd.timer);

        sdata->vif.bss_conf.dtim_period = 0;
        sdata->vif.bss_conf.beacon_rate = NULL;

        sdata->deflink.u.mgd.have_beacon = false;
        sdata->deflink.u.mgd.tracking_signal_avg = false;
        sdata->deflink.u.mgd.disable_wmm_tracking = false;

        ifmgd->flags = 0;

        for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) {
                struct ieee80211_link_data *link;

                link = sdata_dereference(sdata->link[link_id], sdata);
                if (!link)
                        continue;
                ieee80211_link_release_channel(link);
        }

        sdata->vif.bss_conf.csa_active = false;
        sdata->deflink.u.mgd.csa.blocked_tx = false;
        sdata->deflink.u.mgd.csa.waiting_bcn = false;
        sdata->deflink.u.mgd.csa.ignored_same_chan = false;
        ieee80211_vif_unblock_queues_csa(sdata);

        /* existing TX TSPEC sessions no longer exist */
        memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
        wiphy_delayed_work_cancel(local->hw.wiphy, &ifmgd->tx_tspec_wk);

        sdata->vif.bss_conf.power_type = IEEE80211_REG_UNSET_AP;
        sdata->vif.bss_conf.pwr_reduction = 0;
        ieee80211_clear_tpe(&sdata->vif.bss_conf.tpe);

        sdata->vif.cfg.eml_cap = 0;
        sdata->vif.cfg.eml_med_sync_delay = 0;
        sdata->vif.cfg.mld_capa_op = 0;

        memset(&sdata->u.mgd.ttlm_info, 0,
               sizeof(sdata->u.mgd.ttlm_info));
        wiphy_hrtimer_work_cancel(sdata->local->hw.wiphy, &ifmgd->ttlm_work);

        memset(&sdata->vif.neg_ttlm, 0, sizeof(sdata->vif.neg_ttlm));
        wiphy_delayed_work_cancel(sdata->local->hw.wiphy,
                                  &ifmgd->neg_ttlm_timeout_work);

        sdata->u.mgd.removed_links = 0;
        wiphy_hrtimer_work_cancel(sdata->local->hw.wiphy,
                                  &sdata->u.mgd.ml_reconf_work);

        wiphy_work_cancel(sdata->local->hw.wiphy,
                          &ifmgd->teardown_ttlm_work);

        /* if disconnection happens in the middle of the ML reconfiguration
         * flow, cfg80211 must called to release the BSS references obtained
         * when the flow started.
         */
        ieee80211_ml_reconf_reset(sdata);

        ieee80211_vif_set_links(sdata, 0, 0);

        ifmgd->mcast_seq_last = IEEE80211_SN_MODULO;

        ifmgd->epcs.enabled = false;
        ifmgd->epcs.dialog_token = 0;

        memset(ifmgd->userspace_selectors, 0,
               sizeof(ifmgd->userspace_selectors));
}

static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct ieee80211_local *local = sdata->local;

        lockdep_assert_wiphy(local->hw.wiphy);

        if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
                return;

        __ieee80211_stop_poll(sdata);

        ieee80211_recalc_ps(local);

        if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
                return;

        /*
         * We've received a probe response, but are not sure whether
         * we have or will be receiving any beacons or data, so let's
         * schedule the timers again, just in case.
         */
        ieee80211_sta_reset_beacon_monitor(sdata);

        mod_timer(&ifmgd->conn_mon_timer,
                  round_jiffies_up(jiffies +
                                   IEEE80211_CONNECTION_IDLE_TIME));
}

static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
                                           struct ieee80211_hdr *hdr,
                                           u16 tx_time)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        u16 tid;
        int ac;
        struct ieee80211_sta_tx_tspec *tx_tspec;
        unsigned long now = jiffies;

        if (!ieee80211_is_data_qos(hdr->frame_control))
                return;

        tid = ieee80211_get_tid(hdr);
        ac = ieee80211_ac_from_tid(tid);
        tx_tspec = &ifmgd->tx_tspec[ac];

        if (likely(!tx_tspec->admitted_time))
                return;

        if (time_after(now, tx_tspec->time_slice_start + HZ)) {
                tx_tspec->consumed_tx_time = 0;
                tx_tspec->time_slice_start = now;

                if (tx_tspec->downgraded) {
                        tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
                        wiphy_delayed_work_queue(sdata->local->hw.wiphy,
                                                 &ifmgd->tx_tspec_wk, 0);
                }
        }

        if (tx_tspec->downgraded)
                return;

        tx_tspec->consumed_tx_time += tx_time;

        if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
                tx_tspec->downgraded = true;
                tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
                wiphy_delayed_work_queue(sdata->local->hw.wiphy,
                                         &ifmgd->tx_tspec_wk, 0);
        }
}

void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
                             struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
{
        ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);

        if (!ieee80211_is_any_nullfunc(hdr->frame_control) ||
            !sdata->u.mgd.probe_send_count)
                return;

        if (ack)
                sdata->u.mgd.probe_send_count = 0;
        else
                sdata->u.mgd.nullfunc_failed = true;
        wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
}

static void ieee80211_mlme_send_probe_req(struct ieee80211_sub_if_data *sdata,
                                          const u8 *src, const u8 *dst,
                                          const u8 *ssid, size_t ssid_len,
                                          struct ieee80211_channel *channel)
{
        struct sk_buff *skb;

        skb = ieee80211_build_probe_req(sdata, src, dst, (u32)-1, channel,
                                        ssid, ssid_len, NULL, 0,
                                        IEEE80211_PROBE_FLAG_DIRECTED);
        if (skb)
                ieee80211_tx_skb(sdata, skb);
}

static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        u8 *dst = sdata->vif.cfg.ap_addr;
        u8 unicast_limit = max(1, max_probe_tries - 3);
        struct sta_info *sta;

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        /*
         * Try sending broadcast probe requests for the last three
         * probe requests after the first ones failed since some
         * buggy APs only support broadcast probe requests.
         */
        if (ifmgd->probe_send_count >= unicast_limit)
                dst = NULL;

        /*
         * When the hardware reports an accurate Tx ACK status, it's
         * better to send a nullfunc frame instead of a probe request,
         * as it will kick us off the AP quickly if we aren't associated
         * anymore. The timeout will be reset if the frame is ACKed by
         * the AP.
         */
        ifmgd->probe_send_count++;

        if (dst) {
                sta = sta_info_get(sdata, dst);
                if (!WARN_ON(!sta))
                        ieee80211_check_fast_rx(sta);
        }

        if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
                ifmgd->nullfunc_failed = false;
                ieee80211_send_nullfunc(sdata->local, sdata, false);
        } else {
                ieee80211_mlme_send_probe_req(sdata, sdata->vif.addr, dst,
                                              sdata->vif.cfg.ssid,
                                              sdata->vif.cfg.ssid_len,
                                              sdata->deflink.conf->bss->channel);
        }

        ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
        run_again(sdata, ifmgd->probe_timeout);
}

static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
                                   bool beacon)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        bool already = false;

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        if (!ieee80211_sdata_running(sdata))
                return;

        if (!ifmgd->associated)
                return;

        if (sdata->local->tmp_channel || sdata->local->scanning)
                return;

        if (sdata->local->suspending) {
                /* reschedule after resume */
                ieee80211_reset_ap_probe(sdata);
                return;
        }

        if (beacon) {
                mlme_dbg_ratelimited(sdata,
                                     "detected beacon loss from AP (missed %d beacons) - probing\n",
                                     beacon_loss_count);

                ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
        }

        /*
         * The driver/our work has already reported this event or the
         * connection monitoring has kicked in and we have already sent
         * a probe request. Or maybe the AP died and the driver keeps
         * reporting until we disassociate...
         *
         * In either case we have to ignore the current call to this
         * function (except for setting the correct probe reason bit)
         * because otherwise we would reset the timer every time and
         * never check whether we received a probe response!
         */
        if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
                already = true;

        ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;

        if (already)
                return;

        ieee80211_recalc_ps(sdata->local);

        ifmgd->probe_send_count = 0;
        ieee80211_mgd_probe_ap_send(sdata);
}

struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
                                          struct ieee80211_vif *vif)
{
        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct cfg80211_bss *cbss;
        struct sk_buff *skb;
        const struct element *ssid;
        int ssid_len;

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
                    ieee80211_vif_is_mld(&sdata->vif)))
                return NULL;

        if (ifmgd->associated)
                cbss = sdata->deflink.conf->bss;
        else if (ifmgd->auth_data)
                cbss = ifmgd->auth_data->bss;
        else if (ifmgd->assoc_data && ifmgd->assoc_data->link[0].bss)
                cbss = ifmgd->assoc_data->link[0].bss;
        else
                return NULL;

        rcu_read_lock();
        ssid = ieee80211_bss_get_elem(cbss, WLAN_EID_SSID);
        if (WARN_ONCE(!ssid || ssid->datalen > IEEE80211_MAX_SSID_LEN,
                      "invalid SSID element (len=%d)",
                      ssid ? ssid->datalen : -1))
                ssid_len = 0;
        else
                ssid_len = ssid->datalen;

        skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
                                        (u32) -1, cbss->channel,
                                        ssid->data, ssid_len,
                                        NULL, 0, IEEE80211_PROBE_FLAG_DIRECTED);
        rcu_read_unlock();

        return skb;
}
EXPORT_SYMBOL(ieee80211_ap_probereq_get);

static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
                                        const u8 *buf, size_t len, bool tx,
                                        u16 reason, bool reconnect)
{
        struct ieee80211_event event = {
                .type = MLME_EVENT,
                .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
                .u.mlme.reason = reason,
        };

        if (tx)
                cfg80211_tx_mlme_mgmt(sdata->dev, buf, len, reconnect);
        else
                cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);

        drv_event_callback(sdata->local, sdata, &event);
}

static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

        lockdep_assert_wiphy(local->hw.wiphy);

        if (!ifmgd->associated)
                return;

        if (!ifmgd->driver_disconnect) {
                unsigned int link_id;

                /*
                 * AP is probably out of range (or not reachable for another
                 * reason) so remove the bss structs for that AP. In the case
                 * of multi-link, it's not clear that all of them really are
                 * out of range, but if they weren't the driver likely would
                 * have switched to just have a single link active?
                 */
                for (link_id = 0;
                     link_id < ARRAY_SIZE(sdata->link);
                     link_id++) {
                        struct ieee80211_link_data *link;

                        link = sdata_dereference(sdata->link[link_id], sdata);
                        if (!link || !link->conf->bss)
                                continue;
                        cfg80211_unlink_bss(local->hw.wiphy, link->conf->bss);
                        link->conf->bss = NULL;
                }
        }

        ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
                               ifmgd->driver_disconnect ?
                                        WLAN_REASON_DEAUTH_LEAVING :
                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
                               true, frame_buf);
        /* the other links will be destroyed */
        sdata->vif.bss_conf.csa_active = false;
        sdata->deflink.u.mgd.csa.waiting_bcn = false;
        sdata->deflink.u.mgd.csa.blocked_tx = false;
        ieee80211_vif_unblock_queues_csa(sdata);

        ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
                                    WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
                                    ifmgd->reconnect);
        ifmgd->reconnect = false;
}

static void ieee80211_beacon_connection_loss_work(struct wiphy *wiphy,
                                                  struct wiphy_work *work)
{
        struct ieee80211_sub_if_data *sdata =
                container_of(work, struct ieee80211_sub_if_data,
                             u.mgd.beacon_connection_loss_work);
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

        if (ifmgd->connection_loss) {
                sdata_info(sdata, "Connection to AP %pM lost\n",
                           sdata->vif.cfg.ap_addr);
                __ieee80211_disconnect(sdata);
                ifmgd->connection_loss = false;
        } else if (ifmgd->driver_disconnect) {
                sdata_info(sdata,
                           "Driver requested disconnection from AP %pM\n",
                           sdata->vif.cfg.ap_addr);
                __ieee80211_disconnect(sdata);
                ifmgd->driver_disconnect = false;
        } else {
                if (ifmgd->associated)
                        sdata->deflink.u.mgd.beacon_loss_count++;
                ieee80211_mgd_probe_ap(sdata, true);
        }
}

static void ieee80211_csa_connection_drop_work(struct wiphy *wiphy,
                                               struct wiphy_work *work)
{
        struct ieee80211_sub_if_data *sdata =
                container_of(work, struct ieee80211_sub_if_data,
                             u.mgd.csa_connection_drop_work);

        __ieee80211_disconnect(sdata);
}

void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
        struct ieee80211_hw *hw = &sdata->local->hw;

        trace_api_beacon_loss(sdata);

        sdata->u.mgd.connection_loss = false;
        wiphy_work_queue(hw->wiphy, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_beacon_loss);

void ieee80211_connection_loss(struct ieee80211_vif *vif)
{
        struct ieee80211_sub_if_data *sdata;
        struct ieee80211_hw *hw;

        KUNIT_STATIC_STUB_REDIRECT(ieee80211_connection_loss, vif);

        sdata = vif_to_sdata(vif);
        hw = &sdata->local->hw;

        trace_api_connection_loss(sdata);

        sdata->u.mgd.connection_loss = true;
        wiphy_work_queue(hw->wiphy, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_connection_loss);

void ieee80211_disconnect(struct ieee80211_vif *vif, bool reconnect)
{
        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
        struct ieee80211_hw *hw = &sdata->local->hw;

        trace_api_disconnect(sdata, reconnect);

        if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
                return;

        sdata->u.mgd.driver_disconnect = true;
        sdata->u.mgd.reconnect = reconnect;
        wiphy_work_queue(hw->wiphy, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_disconnect);

static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
                                        bool assoc)
{
        struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        sdata->u.mgd.auth_data = NULL;

        if (!assoc) {
                /*
                 * we are not authenticated yet, the only timer that could be
                 * running is the timeout for the authentication response which
                 * which is not relevant anymore.
                 */
                timer_delete_sync(&sdata->u.mgd.timer);
                sta_info_destroy_addr(sdata, auth_data->ap_addr);

                /* other links are destroyed */
                eth_zero_addr(sdata->deflink.u.mgd.bssid);
                ieee80211_link_info_change_notify(sdata, &sdata->deflink,
                                                  BSS_CHANGED_BSSID);
                sdata->u.mgd.flags = 0;

                ieee80211_link_release_channel(&sdata->deflink);
                ieee80211_vif_set_links(sdata, 0, 0);
        }

        cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
        kfree(auth_data);
}

enum assoc_status {
        ASSOC_SUCCESS,
        ASSOC_REJECTED,
        ASSOC_TIMEOUT,
        ASSOC_ABANDON,
};

static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
                                         enum assoc_status status)
{
        struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        sdata->u.mgd.assoc_data = NULL;

        if (status != ASSOC_SUCCESS) {
                /*
                 * we are not associated yet, the only timer that could be
                 * running is the timeout for the association response which
                 * which is not relevant anymore.
                 */
                timer_delete_sync(&sdata->u.mgd.timer);
                sta_info_destroy_addr(sdata, assoc_data->ap_addr);

                eth_zero_addr(sdata->deflink.u.mgd.bssid);
                ieee80211_link_info_change_notify(sdata, &sdata->deflink,
                                                  BSS_CHANGED_BSSID);
                sdata->u.mgd.flags = 0;
                sdata->vif.bss_conf.mu_mimo_owner = false;

                if (status != ASSOC_REJECTED) {
                        struct cfg80211_assoc_failure data = {
                                .timeout = status == ASSOC_TIMEOUT,
                        };
                        int i;

                        BUILD_BUG_ON(ARRAY_SIZE(data.bss) !=
                                     ARRAY_SIZE(assoc_data->link));

                        for (i = 0; i < ARRAY_SIZE(data.bss); i++)
                                data.bss[i] = assoc_data->link[i].bss;

                        if (ieee80211_vif_is_mld(&sdata->vif))
                                data.ap_mld_addr = assoc_data->ap_addr;

                        cfg80211_assoc_failure(sdata->dev, &data);
                }

                ieee80211_link_release_channel(&sdata->deflink);
                ieee80211_vif_set_links(sdata, 0, 0);
        }

        kfree(assoc_data);
}

static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
                                     struct ieee80211_mgmt *mgmt, size_t len)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
        const struct element *challenge;
        u8 *pos;
        u32 tx_flags = 0;
        struct ieee80211_prep_tx_info info = {
                .subtype = IEEE80211_STYPE_AUTH,
                .link_id = auth_data->link_id,
        };

        pos = mgmt->u.auth.variable;
        challenge = cfg80211_find_elem(WLAN_EID_CHALLENGE, pos,
                                       len - (pos - (u8 *)mgmt));
        if (!challenge)
                return;
        auth_data->expected_transaction = 4;
        drv_mgd_prepare_tx(sdata->local, sdata, &info);
        if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
                tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
                           IEEE80211_TX_INTFL_MLME_CONN_TX;
        ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
                            (void *)challenge,
                            challenge->datalen + sizeof(*challenge),
                            auth_data->ap_addr, auth_data->ap_addr,
                            auth_data->key, auth_data->key_len,
                            auth_data->key_idx, tx_flags);
}

static bool ieee80211_mark_sta_auth(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        const u8 *ap_addr = ifmgd->auth_data->ap_addr;
        struct sta_info *sta;

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        sdata_info(sdata, "authenticated\n");
        ifmgd->auth_data->done = true;
        ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
        ifmgd->auth_data->timeout_started = true;
        run_again(sdata, ifmgd->auth_data->timeout);

        /* move station state to auth */
        sta = sta_info_get(sdata, ap_addr);
        if (!sta) {
                WARN_ONCE(1, "%s: STA %pM not found", sdata->name, ap_addr);
                return false;
        }
        if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
                sdata_info(sdata, "failed moving %pM to auth\n", ap_addr);
                return false;
        }

        return true;
}

static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
                                   struct ieee80211_mgmt *mgmt, size_t len)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        u16 auth_alg, auth_transaction, status_code;
        struct ieee80211_event event = {
                .type = MLME_EVENT,
                .u.mlme.data = AUTH_EVENT,
        };
        struct ieee80211_prep_tx_info info = {
                .subtype = IEEE80211_STYPE_AUTH,
        };
        bool sae_need_confirm = false;

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        if (len < 24 + 6)
                return;

        if (!ifmgd->auth_data || ifmgd->auth_data->done)
                return;

        if (!ether_addr_equal(ifmgd->auth_data->ap_addr, mgmt->bssid))
                return;

        auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
        auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
        status_code = le16_to_cpu(mgmt->u.auth.status_code);

        info.link_id = ifmgd->auth_data->link_id;

        if (auth_alg != ifmgd->auth_data->algorithm ||
            (auth_alg != WLAN_AUTH_SAE &&
             auth_transaction != ifmgd->auth_data->expected_transaction) ||
            (auth_alg == WLAN_AUTH_SAE &&
             (auth_transaction < ifmgd->auth_data->expected_transaction ||
              auth_transaction > 2))) {
                sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
                           mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
                           auth_transaction,
                           ifmgd->auth_data->expected_transaction);
                goto notify_driver;
        }

        if (status_code != WLAN_STATUS_SUCCESS) {
                cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);

                if (auth_alg == WLAN_AUTH_SAE &&
                    (status_code == WLAN_STATUS_ANTI_CLOG_REQUIRED ||
                     (auth_transaction == 1 &&
                      (status_code == WLAN_STATUS_SAE_HASH_TO_ELEMENT ||
                       status_code == WLAN_STATUS_SAE_PK)))) {
                        /* waiting for userspace now */
                        ifmgd->auth_data->waiting = true;
                        ifmgd->auth_data->timeout =
                                jiffies + IEEE80211_AUTH_WAIT_SAE_RETRY;
                        ifmgd->auth_data->timeout_started = true;
                        run_again(sdata, ifmgd->auth_data->timeout);
                        if (auth_transaction == 1)
                                sae_need_confirm = true;
                        goto notify_driver;
                }

                sdata_info(sdata, "%pM denied authentication (status %d)\n",
                           mgmt->sa, status_code);
                ieee80211_destroy_auth_data(sdata, false);
                event.u.mlme.status = MLME_DENIED;
                event.u.mlme.reason = status_code;
                drv_event_callback(sdata->local, sdata, &event);
                goto notify_driver;
        }

        switch (ifmgd->auth_data->algorithm) {
        case WLAN_AUTH_OPEN:
        case WLAN_AUTH_LEAP:
        case WLAN_AUTH_FT:
        case WLAN_AUTH_SAE:
        case WLAN_AUTH_FILS_SK:
        case WLAN_AUTH_FILS_SK_PFS:
        case WLAN_AUTH_FILS_PK:
        case WLAN_AUTH_EPPKE:
                break;
        case WLAN_AUTH_SHARED_KEY:
                if (ifmgd->auth_data->expected_transaction != 4) {
                        ieee80211_auth_challenge(sdata, mgmt, len);
                        /* need another frame */
                        return;
                }
                break;
        default:
                WARN_ONCE(1, "invalid auth alg %d",
                          ifmgd->auth_data->algorithm);
                goto notify_driver;
        }

        event.u.mlme.status = MLME_SUCCESS;
        info.success = 1;
        drv_event_callback(sdata->local, sdata, &event);
        if (ifmgd->auth_data->algorithm != WLAN_AUTH_SAE ||
            (auth_transaction == 2 &&
             ifmgd->auth_data->expected_transaction == 2)) {
                if (!ieee80211_mark_sta_auth(sdata))
                        return; /* ignore frame -- wait for timeout */
        } else if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
                   auth_transaction == 1) {
                sae_need_confirm = true;
        } else if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
                   auth_transaction == 2) {
                sdata_info(sdata, "SAE peer confirmed\n");
                ifmgd->auth_data->peer_confirmed = true;
        }

        cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
notify_driver:
        if (!sae_need_confirm)
                drv_mgd_complete_tx(sdata->local, sdata, &info);
}

#define case_WLAN(type) \
        case WLAN_REASON_##type: return #type

const char *ieee80211_get_reason_code_string(u16 reason_code)
{
        switch (reason_code) {
        case_WLAN(UNSPECIFIED);
        case_WLAN(PREV_AUTH_NOT_VALID);
        case_WLAN(DEAUTH_LEAVING);
        case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
        case_WLAN(DISASSOC_AP_BUSY);
        case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
        case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
        case_WLAN(DISASSOC_STA_HAS_LEFT);
        case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
        case_WLAN(DISASSOC_BAD_POWER);
        case_WLAN(DISASSOC_BAD_SUPP_CHAN);
        case_WLAN(INVALID_IE);
        case_WLAN(MIC_FAILURE);
        case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
        case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
        case_WLAN(IE_DIFFERENT);
        case_WLAN(INVALID_GROUP_CIPHER);
        case_WLAN(INVALID_PAIRWISE_CIPHER);
        case_WLAN(INVALID_AKMP);
        case_WLAN(UNSUPP_RSN_VERSION);
        case_WLAN(INVALID_RSN_IE_CAP);
        case_WLAN(IEEE8021X_FAILED);
        case_WLAN(CIPHER_SUITE_REJECTED);
        case_WLAN(DISASSOC_UNSPECIFIED_QOS);
        case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
        case_WLAN(DISASSOC_LOW_ACK);
        case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
        case_WLAN(QSTA_LEAVE_QBSS);
        case_WLAN(QSTA_NOT_USE);
        case_WLAN(QSTA_REQUIRE_SETUP);
        case_WLAN(QSTA_TIMEOUT);
        case_WLAN(QSTA_CIPHER_NOT_SUPP);
        case_WLAN(MESH_PEER_CANCELED);
        case_WLAN(MESH_MAX_PEERS);
        case_WLAN(MESH_CONFIG);
        case_WLAN(MESH_CLOSE);
        case_WLAN(MESH_MAX_RETRIES);
        case_WLAN(MESH_CONFIRM_TIMEOUT);
        case_WLAN(MESH_INVALID_GTK);
        case_WLAN(MESH_INCONSISTENT_PARAM);
        case_WLAN(MESH_INVALID_SECURITY);
        case_WLAN(MESH_PATH_ERROR);
        case_WLAN(MESH_PATH_NOFORWARD);
        case_WLAN(MESH_PATH_DEST_UNREACHABLE);
        case_WLAN(MAC_EXISTS_IN_MBSS);
        case_WLAN(MESH_CHAN_REGULATORY);
        case_WLAN(MESH_CHAN);
        default: return "<unknown>";
        }
}

static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
                                     struct ieee80211_mgmt *mgmt, size_t len)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        if (len < 24 + 2)
                return;

        if (!ether_addr_equal(mgmt->bssid, mgmt->sa)) {
                ieee80211_tdls_handle_disconnect(sdata, mgmt->sa, reason_code);
                return;
        }

        if (ifmgd->associated &&
            ether_addr_equal(mgmt->bssid, sdata->vif.cfg.ap_addr)) {
                sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
                           sdata->vif.cfg.ap_addr, reason_code,
                           ieee80211_get_reason_code_string(reason_code));

                ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

                ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
                                            reason_code, false);
                return;
        }

        if (ifmgd->assoc_data &&
            ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->ap_addr)) {
                sdata_info(sdata,
                           "deauthenticated from %pM while associating (Reason: %u=%s)\n",
                           ifmgd->assoc_data->ap_addr, reason_code,
                           ieee80211_get_reason_code_string(reason_code));

                ieee80211_destroy_assoc_data(sdata, ASSOC_ABANDON);

                cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
                return;
        }
}


static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
                                       struct ieee80211_mgmt *mgmt, size_t len)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        u16 reason_code;

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        if (len < 24 + 2)
                return;

        if (!ifmgd->associated ||
            !ether_addr_equal(mgmt->bssid, sdata->vif.cfg.ap_addr))
                return;

        reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);

        if (!ether_addr_equal(mgmt->bssid, mgmt->sa)) {
                ieee80211_tdls_handle_disconnect(sdata, mgmt->sa, reason_code);
                return;
        }

        sdata_info(sdata, "disassociated from %pM (Reason: %u=%s)\n",
                   sdata->vif.cfg.ap_addr, reason_code,
                   ieee80211_get_reason_code_string(reason_code));

        ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

        ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code,
                                    false);
}

static bool ieee80211_twt_req_supported(struct ieee80211_sub_if_data *sdata,
                                        struct ieee80211_supported_band *sband,
                                        const struct link_sta_info *link_sta,
                                        const struct ieee802_11_elems *elems)
{
        const struct ieee80211_sta_he_cap *own_he_cap =
                ieee80211_get_he_iftype_cap_vif(sband, &sdata->vif);

        if (elems->ext_capab_len < 10)
                return false;

        if (!(elems->ext_capab[9] & WLAN_EXT_CAPA10_TWT_RESPONDER_SUPPORT))
                return false;

        return link_sta->pub->he_cap.he_cap_elem.mac_cap_info[0] &
                IEEE80211_HE_MAC_CAP0_TWT_RES &&
                own_he_cap &&
                (own_he_cap->he_cap_elem.mac_cap_info[0] &
                        IEEE80211_HE_MAC_CAP0_TWT_REQ);
}

static u64 ieee80211_recalc_twt_req(struct ieee80211_sub_if_data *sdata,
                                    struct ieee80211_supported_band *sband,
                                    struct ieee80211_link_data *link,
                                    struct link_sta_info *link_sta,
                                    struct ieee802_11_elems *elems)
{
        bool twt = ieee80211_twt_req_supported(sdata, sband, link_sta, elems);

        if (link->conf->twt_requester != twt) {
                link->conf->twt_requester = twt;
                return BSS_CHANGED_TWT;
        }
        return 0;
}

static bool ieee80211_twt_bcast_support(struct ieee80211_sub_if_data *sdata,
                                        struct ieee80211_bss_conf *bss_conf,
                                        struct ieee80211_supported_band *sband,
                                        struct link_sta_info *link_sta)
{
        const struct ieee80211_sta_he_cap *own_he_cap =
                ieee80211_get_he_iftype_cap_vif(sband, &sdata->vif);

        return bss_conf->he_support &&
                (link_sta->pub->he_cap.he_cap_elem.mac_cap_info[2] &
                        IEEE80211_HE_MAC_CAP2_BCAST_TWT) &&
                own_he_cap &&
                (own_he_cap->he_cap_elem.mac_cap_info[2] &
                        IEEE80211_HE_MAC_CAP2_BCAST_TWT);
}

static void ieee80211_epcs_changed(struct ieee80211_sub_if_data *sdata,
                                   bool enabled)
{
        /* in any case this is called, dialog token should be reset */
        sdata->u.mgd.epcs.dialog_token = 0;

        if (sdata->u.mgd.epcs.enabled == enabled)
                return;

        sdata->u.mgd.epcs.enabled = enabled;
        cfg80211_epcs_changed(sdata->dev, enabled);
}

static void ieee80211_epcs_teardown(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_local *local = sdata->local;
        u8 link_id;

        if (!sdata->u.mgd.epcs.enabled)
                return;

        lockdep_assert_wiphy(local->hw.wiphy);

        for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
                struct ieee802_11_elems *elems;
                struct ieee80211_link_data *link;
                const struct cfg80211_bss_ies *ies;
                bool ret;

                rcu_read_lock();

                link = sdata_dereference(sdata->link[link_id], sdata);
                if (!link || !link->conf || !link->conf->bss) {
                        rcu_read_unlock();
                        continue;
                }

                if (link->u.mgd.disable_wmm_tracking) {
                        rcu_read_unlock();
                        ieee80211_set_wmm_default(link, false, false);
                        continue;
                }

                ies = rcu_dereference(link->conf->bss->beacon_ies);
                if (!ies) {
                        rcu_read_unlock();
                        ieee80211_set_wmm_default(link, false, false);
                        continue;
                }

                elems = ieee802_11_parse_elems(ies->data, ies->len,
                                               IEEE80211_FTYPE_MGMT |
                                               IEEE80211_STYPE_BEACON,
                                               NULL);
                if (!elems) {
                        rcu_read_unlock();
                        ieee80211_set_wmm_default(link, false, false);
                        continue;
                }

                ret = _ieee80211_sta_wmm_params(local, link,
                                                elems->wmm_param,
                                                elems->wmm_param_len,
                                                elems->mu_edca_param_set);

                kfree(elems);
                rcu_read_unlock();

                if (!ret) {
                        ieee80211_set_wmm_default(link, false, false);
                        continue;
                }

                ieee80211_mgd_set_link_qos_params(link);
                ieee80211_link_info_change_notify(sdata, link, BSS_CHANGED_QOS);
        }
}

static bool ieee80211_assoc_config_link(struct ieee80211_link_data *link,
                                        struct link_sta_info *link_sta,
                                        struct cfg80211_bss *cbss,
                                        struct ieee80211_mgmt *mgmt,
                                        const u8 *elem_start,
                                        unsigned int elem_len,
                                        u64 *changed)
{
        struct ieee80211_sub_if_data *sdata = link->sdata;
        struct ieee80211_mgd_assoc_data *assoc_data =
                sdata->u.mgd.assoc_data ?: sdata->u.mgd.reconf.add_links_data;
        struct ieee80211_bss_conf *bss_conf = link->conf;
        struct ieee80211_local *local = sdata->local;
        unsigned int link_id = link->link_id;
        struct ieee80211_elems_parse_params parse_params = {
                .mode = link->u.mgd.conn.mode,
                .start = elem_start,
                .len = elem_len,
                .link_id = link_id == assoc_data->assoc_link_id ? -1 : link_id,
                .from_ap = true,
                .type = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_TYPE,
        };
        bool is_5ghz = cbss->channel->band == NL80211_BAND_5GHZ;
        bool is_6ghz = cbss->channel->band == NL80211_BAND_6GHZ;
        bool is_s1g = cbss->channel->band == NL80211_BAND_S1GHZ;
        const struct cfg80211_bss_ies *bss_ies = NULL;
        struct ieee80211_supported_band *sband;
        struct ieee802_11_elems *elems;
        const __le16 prof_bss_param_ch_present =
                cpu_to_le16(IEEE80211_MLE_STA_CONTROL_BSS_PARAM_CHANGE_CNT_PRESENT);
        u16 capab_info;
        bool ret;

        elems = ieee802_11_parse_elems_full(&parse_params);
        if (!elems)
                return false;

        if (link_id == assoc_data->assoc_link_id) {
                capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);

                /*
                 * we should not get to this flow unless the association was
                 * successful, so set the status directly to success
                 */
                assoc_data->link[link_id].status = WLAN_STATUS_SUCCESS;
                if (elems->ml_basic) {
                        int bss_param_ch_cnt =
                                ieee80211_mle_get_bss_param_ch_cnt((const void *)elems->ml_basic);

                        if (bss_param_ch_cnt < 0) {
                                ret = false;
                                goto out;
                        }
                        bss_conf->bss_param_ch_cnt = bss_param_ch_cnt;
                        bss_conf->bss_param_ch_cnt_link_id = link_id;
                }
        } else if (elems->parse_error & IEEE80211_PARSE_ERR_DUP_NEST_ML_BASIC ||
                   !elems->prof ||
                   !(elems->prof->control & prof_bss_param_ch_present)) {
                ret = false;
                goto out;
        } else {
                const u8 *ptr = elems->prof->variable +
                                elems->prof->sta_info_len - 1;
                int bss_param_ch_cnt;

                /*
                 * During parsing, we validated that these fields exist,
                 * otherwise elems->prof would have been set to NULL.
                 */
                capab_info = get_unaligned_le16(ptr);
                assoc_data->link[link_id].status = get_unaligned_le16(ptr + 2);
                bss_param_ch_cnt =
                        ieee80211_mle_basic_sta_prof_bss_param_ch_cnt(elems->prof);
                bss_conf->bss_param_ch_cnt = bss_param_ch_cnt;
                bss_conf->bss_param_ch_cnt_link_id = link_id;

                if (assoc_data->link[link_id].status != WLAN_STATUS_SUCCESS) {
                        link_info(link, "association response status code=%u\n",
                                  assoc_data->link[link_id].status);
                        ret = true;
                        goto out;
                }
        }

        if (!is_s1g && !elems->supp_rates) {
                sdata_info(sdata, "no SuppRates element in AssocResp\n");
                ret = false;
                goto out;
        }

        link->u.mgd.tdls_chan_switch_prohibited =
                elems->ext_capab && elems->ext_capab_len >= 5 &&
                (elems->ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);

        /*
         * Some APs are erroneously not including some information in their
         * (re)association response frames. Try to recover by using the data
         * from the beacon or probe response. This seems to afflict mobile
         * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
         * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
         */
        if (!ieee80211_hw_check(&local->hw, STRICT) && !is_6ghz &&
            ((assoc_data->wmm && !elems->wmm_param) ||
             (link->u.mgd.conn.mode >= IEEE80211_CONN_MODE_HT &&
              (!elems->ht_cap_elem || !elems->ht_operation)) ||
             (is_5ghz && link->u.mgd.conn.mode >= IEEE80211_CONN_MODE_VHT &&
              (!elems->vht_cap_elem || !elems->vht_operation)))) {
                const struct cfg80211_bss_ies *ies;
                struct ieee802_11_elems *bss_elems;

                rcu_read_lock();
                ies = rcu_dereference(cbss->ies);
                if (ies)
                        bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
                                          GFP_ATOMIC);
                rcu_read_unlock();
                if (!bss_ies) {
                        ret = false;
                        goto out;
                }

                parse_params.start = bss_ies->data;
                parse_params.len = bss_ies->len;
                parse_params.bss = cbss;
                parse_params.link_id = -1;
                bss_elems = ieee802_11_parse_elems_full(&parse_params);
                if (!bss_elems) {
                        ret = false;
                        goto out;
                }

                if (assoc_data->wmm &&
                    !elems->wmm_param && bss_elems->wmm_param) {
                        elems->wmm_param = bss_elems->wmm_param;
                        sdata_info(sdata,
                                   "AP bug: WMM param missing from AssocResp\n");
                }

                /*
                 * Also check if we requested HT/VHT, otherwise the AP doesn't
                 * have to include the IEs in the (re)association response.
                 */
                if (!elems->ht_cap_elem && bss_elems->ht_cap_elem &&
                    link->u.mgd.conn.mode >= IEEE80211_CONN_MODE_HT) {
                        elems->ht_cap_elem = bss_elems->ht_cap_elem;
                        sdata_info(sdata,
                                   "AP bug: HT capability missing from AssocResp\n");
                }
                if (!elems->ht_operation && bss_elems->ht_operation &&
                    link->u.mgd.conn.mode >= IEEE80211_CONN_MODE_HT) {
                        elems->ht_operation = bss_elems->ht_operation;
                        sdata_info(sdata,
                                   "AP bug: HT operation missing from AssocResp\n");
                }

                if (is_5ghz) {
                        if (!elems->vht_cap_elem && bss_elems->vht_cap_elem &&
                            link->u.mgd.conn.mode >= IEEE80211_CONN_MODE_VHT) {
                                elems->vht_cap_elem = bss_elems->vht_cap_elem;
                                sdata_info(sdata,
                                           "AP bug: VHT capa missing from AssocResp\n");
                        }

                        if (!elems->vht_operation && bss_elems->vht_operation &&
                            link->u.mgd.conn.mode >= IEEE80211_CONN_MODE_VHT) {
                                elems->vht_operation = bss_elems->vht_operation;
                                sdata_info(sdata,
                                           "AP bug: VHT operation missing from AssocResp\n");
                        }
                }
                kfree(bss_elems);
        }

        /*
         * We previously checked these in the beacon/probe response, so
         * they should be present here. This is just a safety net.
         * Note that the ieee80211_config_bw() below would also check
         * for this (and more), but this has better error reporting.
         */
        if (!is_6ghz && link->u.mgd.conn.mode >= IEEE80211_CONN_MODE_HT &&
            (!elems->wmm_param || !elems->ht_cap_elem || !elems->ht_operation)) {
                sdata_info(sdata,
                           "HT AP is missing WMM params or HT capability/operation\n");
                ret = false;
                goto out;
        }

        if (is_5ghz && link->u.mgd.conn.mode >= IEEE80211_CONN_MODE_VHT &&
            (!elems->vht_cap_elem || !elems->vht_operation)) {
                sdata_info(sdata,
                           "VHT AP is missing VHT capability/operation\n");
                ret = false;
                goto out;
        }

        /* check/update if AP changed anything in assoc response vs. scan */
        if (ieee80211_config_bw(link, elems,
                                link_id == assoc_data->assoc_link_id,
                                changed,
                                le16_to_cpu(mgmt->frame_control) &
                                        IEEE80211_FCTL_STYPE)) {
                ret = false;
                goto out;
        }

        if (WARN_ON(!link->conf->chanreq.oper.chan)) {
                ret = false;
                goto out;
        }
        sband = local->hw.wiphy->bands[link->conf->chanreq.oper.chan->band];

        /* Set up internal HT/VHT capabilities */
        if (elems->ht_cap_elem && link->u.mgd.conn.mode >= IEEE80211_CONN_MODE_HT)
                ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
                                                  elems->ht_cap_elem,
                                                  link_sta);

        if (elems->vht_cap_elem &&
            link->u.mgd.conn.mode >= IEEE80211_CONN_MODE_VHT) {
                const struct ieee80211_vht_cap *bss_vht_cap = NULL;
                const struct cfg80211_bss_ies *ies;

                /*
                 * Cisco AP module 9115 with FW 17.3 has a bug and sends a
                 * too large maximum MPDU length in the association response
                 * (indicating 12k) that it cannot actually process ...
                 * Work around that.
                 */
                rcu_read_lock();
                ies = rcu_dereference(cbss->ies);
                if (ies) {
                        const struct element *elem;

                        elem = cfg80211_find_elem(WLAN_EID_VHT_CAPABILITY,
                                                  ies->data, ies->len);
                        if (elem && elem->datalen >= sizeof(*bss_vht_cap))
                                bss_vht_cap = (const void *)elem->data;
                }

                if (ieee80211_hw_check(&local->hw, STRICT) &&
                    (!bss_vht_cap || memcmp(bss_vht_cap, elems->vht_cap_elem,
                                            sizeof(*bss_vht_cap)))) {
                        rcu_read_unlock();
                        ret = false;
                        link_info(link, "VHT capabilities mismatch\n");
                        goto out;
                }

                ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
                                                    elems->vht_cap_elem,
                                                    bss_vht_cap, link_sta);
                rcu_read_unlock();
        }

        if (elems->he_operation &&
            link->u.mgd.conn.mode >= IEEE80211_CONN_MODE_HE &&
            elems->he_cap) {
                ieee80211_he_cap_ie_to_sta_he_cap(sdata, sband,
                                                  elems->he_cap,
                                                  elems->he_cap_len,
                                                  elems->he_6ghz_capa,
                                                  link_sta);

                bss_conf->he_support = link_sta->pub->he_cap.has_he;
                if (elems->rsnx && elems->rsnx_len &&
                    (elems->rsnx[0] & WLAN_RSNX_CAPA_PROTECTED_TWT) &&
                    wiphy_ext_feature_isset(local->hw.wiphy,
                                            NL80211_EXT_FEATURE_PROTECTED_TWT))
                        bss_conf->twt_protected = true;
                else
                        bss_conf->twt_protected = false;

                *changed |= ieee80211_recalc_twt_req(sdata, sband, link,
                                                     link_sta, elems);

                if (elems->eht_operation && elems->eht_cap &&
                    link->u.mgd.conn.mode >= IEEE80211_CONN_MODE_EHT) {
                        ieee80211_eht_cap_ie_to_sta_eht_cap(sdata, sband,
                                                            elems->he_cap,
                                                            elems->he_cap_len,
                                                            elems->eht_cap,
                                                            elems->eht_cap_len,
                                                            link_sta);

                        bss_conf->eht_support = link_sta->pub->eht_cap.has_eht;
                        bss_conf->epcs_support = bss_conf->eht_support &&
                                !!(elems->eht_cap->fixed.mac_cap_info[0] &
                                   IEEE80211_EHT_MAC_CAP0_EPCS_PRIO_ACCESS);

                        /* EPCS might be already enabled but a new added link
                         * does not support EPCS. This should not really happen
                         * in practice.
                         */
                        if (sdata->u.mgd.epcs.enabled &&
                            !bss_conf->epcs_support)
                                ieee80211_epcs_teardown(sdata);
                } else {
                        bss_conf->eht_support = false;
                        bss_conf->epcs_support = false;
                }
        } else {
                bss_conf->he_support = false;
                bss_conf->twt_requester = false;
                bss_conf->twt_protected = false;
                bss_conf->eht_support = false;
                bss_conf->epcs_support = false;
        }

        if (elems->uhr_operation && elems->uhr_cap &&
            link->u.mgd.conn.mode >= IEEE80211_CONN_MODE_UHR) {
                ieee80211_uhr_cap_ie_to_sta_uhr_cap(sdata, sband,
                                                    elems->uhr_cap,
                                                    elems->uhr_cap_len,
                                                    link_sta);

                bss_conf->uhr_support = link_sta->pub->uhr_cap.has_uhr;
        } else {
                bss_conf->uhr_support = false;
        }

        if (elems->s1g_oper &&
            link->u.mgd.conn.mode == IEEE80211_CONN_MODE_S1G &&
            elems->s1g_capab)
                ieee80211_s1g_cap_to_sta_s1g_cap(sdata, elems->s1g_capab,
                                                 link_sta);

        bss_conf->twt_broadcast =
                ieee80211_twt_bcast_support(sdata, bss_conf, sband, link_sta);

        if (bss_conf->he_support) {
                bss_conf->he_bss_color.color =
                        le32_get_bits(elems->he_operation->he_oper_params,
                                      IEEE80211_HE_OPERATION_BSS_COLOR_MASK);
                bss_conf->he_bss_color.partial =
                        le32_get_bits(elems->he_operation->he_oper_params,
                                      IEEE80211_HE_OPERATION_PARTIAL_BSS_COLOR);
                bss_conf->he_bss_color.enabled =
                        !le32_get_bits(elems->he_operation->he_oper_params,
                                       IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED);

                if (bss_conf->he_bss_color.enabled)
                        *changed |= BSS_CHANGED_HE_BSS_COLOR;

                bss_conf->htc_trig_based_pkt_ext =
                        le32_get_bits(elems->he_operation->he_oper_params,
                                      IEEE80211_HE_OPERATION_DFLT_PE_DURATION_MASK);
                bss_conf->frame_time_rts_th =
                        le32_get_bits(elems->he_operation->he_oper_params,
                                      IEEE80211_HE_OPERATION_RTS_THRESHOLD_MASK);

                bss_conf->uora_exists = !!elems->uora_element;
                if (elems->uora_element)
                        bss_conf->uora_ocw_range = elems->uora_element[0];

                ieee80211_he_op_ie_to_bss_conf(&sdata->vif, elems->he_operation);
                ieee80211_he_spr_ie_to_bss_conf(&sdata->vif, elems->he_spr);
                /* TODO: OPEN: what happens if BSS color disable is set? */
        }

        if (cbss->transmitted_bss) {
                bss_conf->nontransmitted = true;
                ether_addr_copy(bss_conf->transmitter_bssid,
                                cbss->transmitted_bss->bssid);
                bss_conf->bssid_indicator = cbss->max_bssid_indicator;
                bss_conf->bssid_index = cbss->bssid_index;
        }

        /*
         * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
         * in their association response, so ignore that data for our own
         * configuration. If it changed since the last beacon, we'll get the
         * next beacon and update then.
         */

        /*
         * If an operating mode notification IE is present, override the
         * NSS calculation (that would be done in rate_control_rate_init())
         * and use the # of streams from that element.
         */
        if (elems->opmode_notif &&
            !(*elems->opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
                u8 nss;

                nss = *elems->opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
                nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
                nss += 1;
                link_sta->pub->rx_nss = nss;
        }

        /*
         * Always handle WMM once after association regardless
         * of the first value the AP uses. Setting -1 here has
         * that effect because the AP values is an unsigned
         * 4-bit value.
         */
        link->u.mgd.wmm_last_param_set = -1;
        link->u.mgd.mu_edca_last_param_set = -1;

        if (link->u.mgd.disable_wmm_tracking) {
                ieee80211_set_wmm_default(link, false, false);
        } else if (!ieee80211_sta_wmm_params(local, link, elems->wmm_param,
                                             elems->wmm_param_len,
                                             elems->mu_edca_param_set)) {
                /* still enable QoS since we might have HT/VHT */
                ieee80211_set_wmm_default(link, false, true);
                /* disable WMM tracking in this case to disable
                 * tracking WMM parameter changes in the beacon if
                 * the parameters weren't actually valid. Doing so
                 * avoids changing parameters very strangely when
                 * the AP is going back and forth between valid and
                 * invalid parameters.
                 */
                link->u.mgd.disable_wmm_tracking = true;
        }

        if (elems->max_idle_period_ie) {
                bss_conf->max_idle_period =
                        le16_to_cpu(elems->max_idle_period_ie->max_idle_period);
                bss_conf->protected_keep_alive =
                        !!(elems->max_idle_period_ie->idle_options &
                           WLAN_IDLE_OPTIONS_PROTECTED_KEEP_ALIVE);
                *changed |= BSS_CHANGED_KEEP_ALIVE;
        } else {
                bss_conf->max_idle_period = 0;
                bss_conf->protected_keep_alive = false;
        }

        /* set assoc capability (AID was already set earlier),
         * ieee80211_set_associated() will tell the driver */
        bss_conf->assoc_capability = capab_info;

        ret = true;
out:
        kfree(elems);
        kfree(bss_ies);
        return ret;
}

static int ieee80211_mgd_setup_link_sta(struct ieee80211_link_data *link,
                                        struct sta_info *sta,
                                        struct link_sta_info *link_sta,
                                        struct cfg80211_bss *cbss)
{
        struct ieee80211_sub_if_data *sdata = link->sdata;
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_bss *bss = (void *)cbss->priv;
        u32 rates = 0, basic_rates = 0;
        bool have_higher_than_11mbit = false;
        int min_rate = INT_MAX, min_rate_index = -1;
        struct ieee80211_supported_band *sband;

        memcpy(link_sta->addr, cbss->bssid, ETH_ALEN);
        memcpy(link_sta->pub->addr, cbss->bssid, ETH_ALEN);

        /* TODO: S1G Basic Rate Set is expressed elsewhere */
        if (cbss->channel->band == NL80211_BAND_S1GHZ) {
                ieee80211_s1g_sta_rate_init(sta);
                return 0;
        }

        sband = local->hw.wiphy->bands[cbss->channel->band];

        ieee80211_get_rates(sband, bss->supp_rates, bss->supp_rates_len,
                            NULL, 0,
                            &rates, &basic_rates, NULL,
                            &have_higher_than_11mbit,
                            &min_rate, &min_rate_index);

        /*
         * This used to be a workaround for basic rates missing
         * in the association response frame. Now that we no
         * longer use the basic rates from there, it probably
         * doesn't happen any more, but keep the workaround so
         * in case some *other* APs are buggy in different ways
         * we can connect -- with a warning.
         * Allow this workaround only in case the AP provided at least
         * one rate.
         */
        if (min_rate_index < 0) {
                link_info(link, "No legacy rates in association response\n");
                return -EINVAL;
        } else if (!basic_rates) {
                link_info(link, "No basic rates, using min rate instead\n");
                basic_rates = BIT(min_rate_index);
        }

        if (rates)
                link_sta->pub->supp_rates[cbss->channel->band] = rates;
        else
                link_info(link, "No rates found, keeping mandatory only\n");

        link->conf->basic_rates = basic_rates;

        /* cf. IEEE 802.11 9.2.12 */
        link->operating_11g_mode = sband->band == NL80211_BAND_2GHZ &&
                                   have_higher_than_11mbit;

        return 0;
}

static u8 ieee80211_max_rx_chains(struct ieee80211_link_data *link,
                                  struct cfg80211_bss *cbss)
{
        struct ieee80211_he_mcs_nss_supp *he_mcs_nss_supp;
        const struct element *ht_cap_elem, *vht_cap_elem;
        const struct cfg80211_bss_ies *ies;
        const struct ieee80211_ht_cap *ht_cap;
        const struct ieee80211_vht_cap *vht_cap;
        const struct ieee80211_he_cap_elem *he_cap;
        const struct element *he_cap_elem;
        u16 mcs_80_map, mcs_160_map;
        int i, mcs_nss_size;
        bool support_160;
        u8 chains = 1;

        if (link->u.mgd.conn.mode < IEEE80211_CONN_MODE_HT)
                return chains;

        ht_cap_elem = ieee80211_bss_get_elem(cbss, WLAN_EID_HT_CAPABILITY);
        if (ht_cap_elem && ht_cap_elem->datalen >= sizeof(*ht_cap)) {
                ht_cap = (void *)ht_cap_elem->data;
                chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
                /*
                 * TODO: use "Tx Maximum Number Spatial Streams Supported" and
                 *       "Tx Unequal Modulation Supported" fields.
                 */
        }

        if (link->u.mgd.conn.mode < IEEE80211_CONN_MODE_VHT)
                return chains;

        vht_cap_elem = ieee80211_bss_get_elem(cbss, WLAN_EID_VHT_CAPABILITY);
        if (vht_cap_elem && vht_cap_elem->datalen >= sizeof(*vht_cap)) {
                u8 nss;
                u16 tx_mcs_map;

                vht_cap = (void *)vht_cap_elem->data;
                tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
                for (nss = 8; nss > 0; nss--) {
                        if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
                                        IEEE80211_VHT_MCS_NOT_SUPPORTED)
                                break;
                }
                /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
                chains = max(chains, nss);
        }

        if (link->u.mgd.conn.mode < IEEE80211_CONN_MODE_HE)
                return chains;

        ies = rcu_dereference(cbss->ies);
        he_cap_elem = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_CAPABILITY,
                                             ies->data, ies->len);

        if (!he_cap_elem || he_cap_elem->datalen < sizeof(*he_cap) + 1)
                return chains;

        /* skip one byte ext_tag_id */
        he_cap = (void *)(he_cap_elem->data + 1);
        mcs_nss_size = ieee80211_he_mcs_nss_size(he_cap);

        /* invalid HE IE */
        if (he_cap_elem->datalen < 1 + mcs_nss_size + sizeof(*he_cap))
                return chains;

        /* mcs_nss is right after he_cap info */
        he_mcs_nss_supp = (void *)(he_cap + 1);

        mcs_80_map = le16_to_cpu(he_mcs_nss_supp->tx_mcs_80);

        for (i = 7; i >= 0; i--) {
                u8 mcs_80 = mcs_80_map >> (2 * i) & 3;

                if (mcs_80 != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
                        chains = max_t(u8, chains, i + 1);
                        break;
                }
        }

        support_160 = he_cap->phy_cap_info[0] &
                      IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G;

        if (!support_160)
                return chains;

        mcs_160_map = le16_to_cpu(he_mcs_nss_supp->tx_mcs_160);
        for (i = 7; i >= 0; i--) {
                u8 mcs_160 = mcs_160_map >> (2 * i) & 3;

                if (mcs_160 != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
                        chains = max_t(u8, chains, i + 1);
                        break;
                }
        }

        return chains;
}

static void
ieee80211_determine_our_sta_mode(struct ieee80211_sub_if_data *sdata,
                                 struct ieee80211_supported_band *sband,
                                 struct cfg80211_assoc_request *req,
                                 bool wmm_used, int link_id,
                                 struct ieee80211_conn_settings *conn)
{
        struct ieee80211_sta_ht_cap sta_ht_cap = sband->ht_cap;
        bool is_5ghz = sband->band == NL80211_BAND_5GHZ;
        bool is_6ghz = sband->band == NL80211_BAND_6GHZ;
        const struct ieee80211_sta_he_cap *he_cap;
        const struct ieee80211_sta_eht_cap *eht_cap;
        const struct ieee80211_sta_uhr_cap *uhr_cap;
        struct ieee80211_sta_vht_cap vht_cap;

        if (sband->band == NL80211_BAND_S1GHZ) {
                conn->mode = IEEE80211_CONN_MODE_S1G;
                conn->bw_limit = IEEE80211_CONN_BW_LIMIT_20;
                mlme_dbg(sdata, "operating as S1G STA\n");
                return;
        }

        conn->mode = IEEE80211_CONN_MODE_LEGACY;
        conn->bw_limit = IEEE80211_CONN_BW_LIMIT_20;

        ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);

        if (req && req->flags & ASSOC_REQ_DISABLE_HT) {
                mlme_link_id_dbg(sdata, link_id,
                                 "HT disabled by flag, limiting to legacy\n");
                goto out;
        }

        if (!wmm_used) {
                mlme_link_id_dbg(sdata, link_id,
                                 "WMM/QoS not supported, limiting to legacy\n");
                goto out;
        }

        if (req) {
                unsigned int i;

                for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
                        if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
                            req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
                            req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
                                netdev_info(sdata->dev,
                                            "WEP/TKIP use, limiting to legacy\n");
                                goto out;
                        }
                }
        }

        if (!sta_ht_cap.ht_supported && !is_6ghz) {
                mlme_link_id_dbg(sdata, link_id,
                                 "HT not supported (and not on 6 GHz), limiting to legacy\n");
                goto out;
        }

        /* HT is fine */
        conn->mode = IEEE80211_CONN_MODE_HT;
        conn->bw_limit = sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
                IEEE80211_CONN_BW_LIMIT_40 :
                IEEE80211_CONN_BW_LIMIT_20;

        memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
        ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);

        if (req && req->flags & ASSOC_REQ_DISABLE_VHT) {
                mlme_link_id_dbg(sdata, link_id,
                                 "VHT disabled by flag, limiting to HT\n");
                goto out;
        }

        if (vht_cap.vht_supported && is_5ghz) {
                bool have_80mhz = false;
                unsigned int i;

                if (conn->bw_limit == IEEE80211_CONN_BW_LIMIT_20) {
                        mlme_link_id_dbg(sdata, link_id,
                                         "no 40 MHz support on 5 GHz, limiting to HT\n");
                        goto out;
                }

                /* Allow VHT if at least one channel on the sband supports 80 MHz */
                for (i = 0; i < sband->n_channels; i++) {
                        if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
                                                        IEEE80211_CHAN_NO_80MHZ))
                                continue;

                        have_80mhz = true;
                        break;
                }

                if (!have_80mhz) {
                        mlme_link_id_dbg(sdata, link_id,
                                         "no 80 MHz channel support on 5 GHz, limiting to HT\n");
                        goto out;
                }
        } else if (is_5ghz) { /* !vht_supported but on 5 GHz */
                mlme_link_id_dbg(sdata, link_id,
                                 "no VHT support on 5 GHz, limiting to HT\n");
                goto out;
        }

        /* VHT - if we have - is fine, including 80 MHz, check 160 below again */
        if (sband->band != NL80211_BAND_2GHZ) {
                conn->mode = IEEE80211_CONN_MODE_VHT;
                conn->bw_limit = IEEE80211_CONN_BW_LIMIT_160;
        }

        if (is_5ghz &&
            !(vht_cap.cap & (IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ |
                             IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ))) {
                conn->bw_limit = IEEE80211_CONN_BW_LIMIT_80;
                mlme_link_id_dbg(sdata, link_id,
                                 "no VHT 160 MHz capability on 5 GHz, limiting to 80 MHz");
        }

        if (req && req->flags & ASSOC_REQ_DISABLE_HE) {
                mlme_link_id_dbg(sdata, link_id,
                                 "HE disabled by flag, limiting to HT/VHT\n");
                goto out;
        }

        he_cap = ieee80211_get_he_iftype_cap_vif(sband, &sdata->vif);
        if (!he_cap) {
                WARN_ON(is_6ghz);
                mlme_link_id_dbg(sdata, link_id,
                                 "no HE support, limiting to HT/VHT\n");
                goto out;
        }

        /* so we have HE */
        conn->mode = IEEE80211_CONN_MODE_HE;

        /* check bandwidth */
        switch (sband->band) {
        default:
        case NL80211_BAND_2GHZ:
                if (he_cap->he_cap_elem.phy_cap_info[0] &
                    IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_IN_2G)
                        break;
                conn->bw_limit = IEEE80211_CONN_BW_LIMIT_20;
                mlme_link_id_dbg(sdata, link_id,
                                 "no 40 MHz HE cap in 2.4 GHz, limiting to 20 MHz\n");
                break;
        case NL80211_BAND_5GHZ:
                if (!(he_cap->he_cap_elem.phy_cap_info[0] &
                      IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_80MHZ_IN_5G)) {
                        conn->bw_limit = IEEE80211_CONN_BW_LIMIT_20;
                        mlme_link_id_dbg(sdata, link_id,
                                         "no 40/80 MHz HE cap in 5 GHz, limiting to 20 MHz\n");
                        break;
                }
                if (!(he_cap->he_cap_elem.phy_cap_info[0] &
                      IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G)) {
                        conn->bw_limit = min_t(enum ieee80211_conn_bw_limit,
                                               conn->bw_limit,
                                               IEEE80211_CONN_BW_LIMIT_80);
                        mlme_link_id_dbg(sdata, link_id,
                                         "no 160 MHz HE cap in 5 GHz, limiting to 80 MHz\n");
                }
                break;
        case NL80211_BAND_6GHZ:
                if (he_cap->he_cap_elem.phy_cap_info[0] &
                    IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G)
                        break;
                conn->bw_limit = min_t(enum ieee80211_conn_bw_limit,
                                       conn->bw_limit,
                                       IEEE80211_CONN_BW_LIMIT_80);
                mlme_link_id_dbg(sdata, link_id,
                                 "no 160 MHz HE cap in 6 GHz, limiting to 80 MHz\n");
                break;
        }

        if (req && req->flags & ASSOC_REQ_DISABLE_EHT) {
                mlme_link_id_dbg(sdata, link_id,
                                 "EHT disabled by flag, limiting to HE\n");
                goto out;
        }

        eht_cap = ieee80211_get_eht_iftype_cap_vif(sband, &sdata->vif);
        if (!eht_cap) {
                mlme_link_id_dbg(sdata, link_id,
                                 "no EHT support, limiting to HE\n");
                goto out;
        }
        conn->mode = IEEE80211_CONN_MODE_EHT;

        /* check bandwidth */
        if (is_6ghz &&
            eht_cap->eht_cap_elem.phy_cap_info[0] & IEEE80211_EHT_PHY_CAP0_320MHZ_IN_6GHZ)
                conn->bw_limit = IEEE80211_CONN_BW_LIMIT_320;
        else if (is_6ghz)
                mlme_link_id_dbg(sdata, link_id,
                                 "no EHT 320 MHz cap in 6 GHz, limiting to 160 MHz\n");

        if (req && req->flags & ASSOC_REQ_DISABLE_UHR) {
                mlme_link_id_dbg(sdata, link_id,
                                 "UHR disabled by flag, limiting to EHT\n");
                goto out;
        }

        uhr_cap = ieee80211_get_uhr_iftype_cap_vif(sband, &sdata->vif);
        if (!uhr_cap) {
                mlme_link_id_dbg(sdata, link_id,
                                 "no UHR support, limiting to EHT\n");
                goto out;
        }
        conn->mode = IEEE80211_CONN_MODE_UHR;

out:
        mlme_link_id_dbg(sdata, link_id,
                         "determined local STA to be %s, BW limited to %d MHz\n",
                         ieee80211_conn_mode_str(conn->mode),
                         20 * (1 << conn->bw_limit));
}

static void
ieee80211_determine_our_sta_mode_auth(struct ieee80211_sub_if_data *sdata,
                                      struct ieee80211_supported_band *sband,
                                      struct cfg80211_auth_request *req,
                                      bool wmm_used,
                                      struct ieee80211_conn_settings *conn)
{
        ieee80211_determine_our_sta_mode(sdata, sband, NULL, wmm_used,
                                         req->link_id > 0 ? req->link_id : 0,
                                         conn);
}

static void
ieee80211_determine_our_sta_mode_assoc(struct ieee80211_sub_if_data *sdata,
                                       struct ieee80211_supported_band *sband,
                                       struct cfg80211_assoc_request *req,
                                       bool wmm_used, int link_id,
                                       struct ieee80211_conn_settings *conn)
{
        struct ieee80211_conn_settings tmp;

        WARN_ON(!req);

        ieee80211_determine_our_sta_mode(sdata, sband, req, wmm_used, link_id,
                                         &tmp);

        conn->mode = min_t(enum ieee80211_conn_mode,
                           conn->mode, tmp.mode);
        conn->bw_limit = min_t(enum ieee80211_conn_bw_limit,
                               conn->bw_limit, tmp.bw_limit);
}

static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
                                  struct ieee80211_link_data *link,
                                  int link_id,
                                  struct cfg80211_bss *cbss, bool mlo,
                                  struct ieee80211_conn_settings *conn,
                                  unsigned long *userspace_selectors)
{
        struct ieee80211_local *local = sdata->local;
        bool is_6ghz = cbss->channel->band == NL80211_BAND_6GHZ;
        struct ieee80211_chan_req chanreq = {};
        struct cfg80211_chan_def ap_chandef;
        struct ieee802_11_elems *elems;
        int ret;

        lockdep_assert_wiphy(local->hw.wiphy);

        rcu_read_lock();
        elems = ieee80211_determine_chan_mode(sdata, conn, cbss, link_id,
                                              &chanreq, &ap_chandef,
                                              userspace_selectors);

        if (IS_ERR(elems)) {
                rcu_read_unlock();
                return PTR_ERR(elems);
        }

        if (mlo && !elems->ml_basic) {
                sdata_info(sdata, "Rejecting MLO as it is not supported by AP\n");
                rcu_read_unlock();
                kfree(elems);
                return -EINVAL;
        }

        if (link && is_6ghz && conn->mode >= IEEE80211_CONN_MODE_HE) {
                const struct ieee80211_he_6ghz_oper *he_6ghz_oper;

                if (elems->pwr_constr_elem)
                        link->conf->pwr_reduction = *elems->pwr_constr_elem;

                he_6ghz_oper = ieee80211_he_6ghz_oper(elems->he_operation);
                if (he_6ghz_oper)
                        link->conf->power_type =
                                cfg80211_6ghz_power_type(he_6ghz_oper->control,
                                                         cbss->channel->flags);
                else
                        link_info(link,
                                  "HE 6 GHz operation missing (on %d MHz), expect issues\n",
                                  cbss->channel->center_freq);

                link->conf->tpe = elems->tpe;
                ieee80211_rearrange_tpe(&link->conf->tpe, &ap_chandef,
                                        &chanreq.oper);
        }
        rcu_read_unlock();
        /* the element data was RCU protected so no longer valid anyway */
        kfree(elems);
        elems = NULL;

        if (!link)
                return 0;

        rcu_read_lock();
        link->needed_rx_chains = min(ieee80211_max_rx_chains(link, cbss),
                                     local->rx_chains);
        rcu_read_unlock();

        /*
         * If this fails (possibly due to channel context sharing
         * on incompatible channels, e.g. 80+80 and 160 sharing the
         * same control channel) try to use a smaller bandwidth.
         */
        ret = ieee80211_link_use_channel(link, &chanreq,
                                         IEEE80211_CHANCTX_SHARED);

        /* don't downgrade for 5/10/S1G MHz channels, though. */
        if (chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
            chanreq.oper.width == NL80211_CHAN_WIDTH_10 ||
            cfg80211_chandef_is_s1g(&chanreq.oper))
                return ret;

        while (ret && chanreq.oper.width != NL80211_CHAN_WIDTH_20_NOHT) {
                ieee80211_chanreq_downgrade(&chanreq, conn);

                ret = ieee80211_link_use_channel(link, &chanreq,
                                                 IEEE80211_CHANCTX_SHARED);
        }

        return ret;
}

static bool ieee80211_get_dtim(const struct cfg80211_bss_ies *ies,
                               u8 *dtim_count, u8 *dtim_period)
{
        const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM, ies->data, ies->len);
        const u8 *idx_ie = cfg80211_find_ie(WLAN_EID_MULTI_BSSID_IDX, ies->data,
                                         ies->len);
        const struct ieee80211_tim_ie *tim = NULL;
        const struct ieee80211_bssid_index *idx;
        bool valid = tim_ie && tim_ie[1] >= 2;

        if (valid)
                tim = (void *)(tim_ie + 2);

        if (dtim_count)
                *dtim_count = valid ? tim->dtim_count : 0;

        if (dtim_period)
                *dtim_period = valid ? tim->dtim_period : 0;

        /* Check if value is overridden by non-transmitted profile */
        if (!idx_ie || idx_ie[1] < 3)
                return valid;

        idx = (void *)(idx_ie + 2);

        if (dtim_count)
                *dtim_count = idx->dtim_count;

        if (dtim_period)
                *dtim_period = idx->dtim_period;

        return true;
}

static u16 ieee80211_get_ttlm(u8 bm_size, u8 *data)
{
        if (bm_size == 1)
                return *data;

        return get_unaligned_le16(data);
}

static int
ieee80211_parse_adv_t2l(struct ieee80211_sub_if_data *sdata,
                        const struct ieee80211_ttlm_elem *ttlm,
                        struct ieee80211_adv_ttlm_info *ttlm_info)
{
        /* The element size was already validated in
         * ieee80211_tid_to_link_map_size_ok()
         */
        u8 control, link_map_presence, map_size, tid;
        u8 *pos;

        memset(ttlm_info, 0, sizeof(*ttlm_info));
        pos = (void *)ttlm->optional;
        control = ttlm->control;

        if ((control & IEEE80211_TTLM_CONTROL_DIRECTION) !=
            IEEE80211_TTLM_DIRECTION_BOTH) {
                sdata_info(sdata, "Invalid advertised T2L map direction\n");
                return -EINVAL;
        }

        if (!(control & IEEE80211_TTLM_CONTROL_DEF_LINK_MAP)) {
                link_map_presence = *pos;
                pos++;
        }

        if (control & IEEE80211_TTLM_CONTROL_SWITCH_TIME_PRESENT) {
                ttlm_info->switch_time = get_unaligned_le16(pos);

                /* Since ttlm_info->switch_time == 0 means no switch time, bump
                 * it by 1.
                 */
                if (!ttlm_info->switch_time)
                        ttlm_info->switch_time = 1;

                pos += 2;
        }

        if (control & IEEE80211_TTLM_CONTROL_EXPECTED_DUR_PRESENT) {
                ttlm_info->duration = pos[0] | pos[1] << 8 | pos[2] << 16;
                pos += 3;
        }

        if (control & IEEE80211_TTLM_CONTROL_DEF_LINK_MAP) {
                ttlm_info->map = 0xffff;
                return 0;
        }

        if (control & IEEE80211_TTLM_CONTROL_LINK_MAP_SIZE)
                map_size = 1;
        else
                map_size = 2;

        /* According to Draft P802.11be_D3.0 clause 35.3.7.1.7, an AP MLD shall
         * not advertise a TID-to-link mapping that does not map all TIDs to the
         * same link set, reject frame if not all links have mapping
         */
        if (link_map_presence != 0xff) {
                sdata_info(sdata,
                           "Invalid advertised T2L mapping presence indicator\n");
                return -EINVAL;
        }

        ttlm_info->map = ieee80211_get_ttlm(map_size, pos);
        if (!ttlm_info->map) {
                sdata_info(sdata,
                           "Invalid advertised T2L map for TID 0\n");
                return -EINVAL;
        }

        pos += map_size;

        for (tid = 1; tid < 8; tid++) {
                u16 map = ieee80211_get_ttlm(map_size, pos);

                if (map != ttlm_info->map) {
                        sdata_info(sdata, "Invalid advertised T2L map for tid %d\n",
                                   tid);
                        return -EINVAL;
                }

                pos += map_size;
        }
        return 0;
}

static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
                                    struct ieee80211_mgmt *mgmt,
                                    struct ieee802_11_elems *elems,
                                    const u8 *elem_start, unsigned int elem_len)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
        struct ieee80211_local *local = sdata->local;
        unsigned int link_id;
        struct sta_info *sta;
        u64 changed[IEEE80211_MLD_MAX_NUM_LINKS] = {};
        u16 valid_links = 0, dormant_links = 0;
        int err;

        lockdep_assert_wiphy(sdata->local->hw.wiphy);
        /*
         * station info was already allocated and inserted before
         * the association and should be available to us
         */
        sta = sta_info_get(sdata, assoc_data->ap_addr);
        if (WARN_ON(!sta))
                goto out_err;

        sta->sta.spp_amsdu = assoc_data->spp_amsdu;

        if (ieee80211_vif_is_mld(&sdata->vif)) {
                for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
                        if (!assoc_data->link[link_id].bss)
                                continue;

                        valid_links |= BIT(link_id);

                        if (link_id != assoc_data->assoc_link_id) {
                                err = ieee80211_sta_allocate_link(sta, link_id);
                                if (err)
                                        goto out_err;
                        }
                }

                /*
                 * We do not support setting a negotiated TTLM during
                 * association. As such, we can assume that if there is a TTLM,
                 * then it is the currently active advertised TTLM.
                 * In that case, there must be exactly one TTLM that does not
                 * have a switch time set. This mapping should also leave us
                 * with at least one usable link.
                 */
                if (elems->ttlm_num > 1) {
                        sdata_info(sdata,
                                   "More than one advertised TTLM in association response\n");
                        goto out_err;
                } else if (elems->ttlm_num == 1) {
                        if (ieee80211_parse_adv_t2l(sdata, elems->ttlm[0],
                                                    &sdata->u.mgd.ttlm_info) ||
                            sdata->u.mgd.ttlm_info.switch_time != 0 ||
                            !(valid_links & sdata->u.mgd.ttlm_info.map)) {
                                sdata_info(sdata,
                                           "Invalid advertised TTLM in association response\n");
                                goto out_err;
                        }

                        sdata->u.mgd.ttlm_info.active = true;
                        dormant_links =
                                valid_links & ~sdata->u.mgd.ttlm_info.map;
                }

                ieee80211_vif_set_links(sdata, valid_links, dormant_links);
        }

        for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
                struct cfg80211_bss *cbss = assoc_data->link[link_id].bss;
                struct ieee80211_link_data *link;
                struct link_sta_info *link_sta;

                if (!cbss)
                        continue;

                link = sdata_dereference(sdata->link[link_id], sdata);
                if (WARN_ON(!link))
                        goto out_err;

                if (ieee80211_vif_is_mld(&sdata->vif))
                        link_info(link,
                                  "local address %pM, AP link address %pM%s\n",
                                  link->conf->addr,
                                  assoc_data->link[link_id].bss->bssid,
                                  link_id == assoc_data->assoc_link_id ?
                                        " (assoc)" : "");

                link_sta = rcu_dereference_protected(sta->link[link_id],
                                                     lockdep_is_held(&local->hw.wiphy->mtx));
                if (WARN_ON(!link_sta))
                        goto out_err;

                if (!link->u.mgd.have_beacon) {
                        const struct cfg80211_bss_ies *ies;

                        rcu_read_lock();
                        ies = rcu_dereference(cbss->beacon_ies);
                        if (ies)
                                link->u.mgd.have_beacon = true;
                        else
                                ies = rcu_dereference(cbss->ies);
                        ieee80211_get_dtim(ies,
                                           &link->conf->sync_dtim_count,
                                           &link->u.mgd.dtim_period);
                        link->conf->beacon_int = cbss->beacon_interval;
                        rcu_read_unlock();
                }

                link->conf->dtim_period = link->u.mgd.dtim_period ?: 1;

                if (link_id != assoc_data->assoc_link_id) {
                        link->u.mgd.conn = assoc_data->link[link_id].conn;

                        err = ieee80211_prep_channel(sdata, link, link_id, cbss,
                                                     true, &link->u.mgd.conn,
                                                     sdata->u.mgd.userspace_selectors);
                        if (err) {
                                link_info(link, "prep_channel failed\n");
                                goto out_err;
                        }
                }

                err = ieee80211_mgd_setup_link_sta(link, sta, link_sta,
                                                   assoc_data->link[link_id].bss);
                if (err)
                        goto out_err;

                if (!ieee80211_assoc_config_link(link, link_sta,
                                                 assoc_data->link[link_id].bss,
                                                 mgmt, elem_start, elem_len,
                                                 &changed[link_id]))
                        goto out_err;

                if (assoc_data->link[link_id].status != WLAN_STATUS_SUCCESS) {
                        valid_links &= ~BIT(link_id);
                        ieee80211_sta_remove_link(sta, link_id);
                        continue;
                }

                if (link_id != assoc_data->assoc_link_id) {
                        err = ieee80211_sta_activate_link(sta, link_id);
                        if (err)
                                goto out_err;
                }
        }

        /* links might have changed due to rejected ones, set them again */
        ieee80211_vif_set_links(sdata, valid_links, dormant_links);

        rate_control_rate_init_all_links(sta);

        if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
                set_sta_flag(sta, WLAN_STA_MFP);
                sta->sta.mfp = true;
        } else {
                sta->sta.mfp = false;
        }

        ieee80211_sta_set_max_amsdu_subframes(sta, elems->ext_capab,
                                              elems->ext_capab_len);

        sta->sta.wme = (elems->wmm_param || elems->s1g_capab) &&
                       local->hw.queues >= IEEE80211_NUM_ACS;

        err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
        if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
                err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
        if (err) {
                sdata_info(sdata,
                           "failed to move station %pM to desired state\n",
                           sta->sta.addr);
                WARN_ON(__sta_info_destroy(sta));
                goto out_err;
        }

        if (sdata->wdev.use_4addr)
                drv_sta_set_4addr(local, sdata, &sta->sta, true);

        ieee80211_set_associated(sdata, assoc_data, changed);

        /*
         * If we're using 4-addr mode, let the AP know that we're
         * doing so, so that it can create the STA VLAN on its side
         */
        if (ifmgd->use_4addr)
                ieee80211_send_4addr_nullfunc(local, sdata);

        /*
         * Start timer to probe the connection to the AP now.
         * Also start the timer that will detect beacon loss.
         */
        ieee80211_sta_reset_beacon_monitor(sdata);
        ieee80211_sta_reset_conn_monitor(sdata);

        return true;
out_err:
        eth_zero_addr(sdata->vif.cfg.ap_addr);
        return false;
}

static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
                                         struct ieee80211_mgmt *mgmt,
                                         size_t len)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
        u16 capab_info, status_code, aid;
        struct ieee80211_elems_parse_params parse_params = {
                .bss = NULL,
                .link_id = -1,
                .from_ap = true,
                .type = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_TYPE,
        };
        struct ieee802_11_elems *elems;
        int ac;
        const u8 *elem_start;
        unsigned int elem_len;
        bool reassoc;
        struct ieee80211_event event = {
                .type = MLME_EVENT,
                .u.mlme.data = ASSOC_EVENT,
        };
        struct ieee80211_prep_tx_info info = {};
        struct cfg80211_rx_assoc_resp_data resp = {
                .uapsd_queues = -1,
        };
        u8 ap_mld_addr[ETH_ALEN] __aligned(2);
        unsigned int link_id;
        u16 max_aid = IEEE80211_MAX_AID;

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        if (!assoc_data)
                return;

        info.link_id = assoc_data->assoc_link_id;

        parse_params.mode =
                assoc_data->link[assoc_data->assoc_link_id].conn.mode;

        if (!ether_addr_equal(assoc_data->ap_addr, mgmt->bssid) ||
            !ether_addr_equal(assoc_data->ap_addr, mgmt->sa))
                return;

        /*
         * AssocResp and ReassocResp have identical structure, so process both
         * of them in this function.
         */

        if (len < 24 + 6)
                return;

        reassoc = ieee80211_is_reassoc_resp(mgmt->frame_control);
        capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
        status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
        if (assoc_data->s1g) {
                elem_start = mgmt->u.s1g_assoc_resp.variable;
                max_aid = IEEE80211_MAX_SUPPORTED_S1G_AID;
        } else {
                elem_start = mgmt->u.assoc_resp.variable;
        }

        /*
         * Note: this may not be perfect, AP might misbehave - if
         * anyone needs to rely on perfect complete notification
         * with the exact right subtype, then we need to track what
         * we actually transmitted.
         */
        info.subtype = reassoc ? IEEE80211_STYPE_REASSOC_REQ :
                                 IEEE80211_STYPE_ASSOC_REQ;

        if (assoc_data->fils_kek_len &&
            fils_decrypt_assoc_resp(sdata, (u8 *)mgmt, &len, assoc_data) < 0)
                return;

        elem_len = len - (elem_start - (u8 *)mgmt);
        parse_params.start = elem_start;
        parse_params.len = elem_len;
        elems = ieee802_11_parse_elems_full(&parse_params);
        if (!elems)
                goto notify_driver;

        if (elems->aid_resp)
                aid = le16_to_cpu(elems->aid_resp->aid);
        else
                aid = le16_to_cpu(mgmt->u.assoc_resp.aid);

        /*
         * The 5 MSB of the AID field are reserved for a non-S1G STA. For
         * an S1G STA the 3 MSBs are reserved.
         * (802.11-2016 9.4.1.8 AID field).
         */
        aid &= assoc_data->s1g ? 0x1fff : 0x7ff;

        sdata_info(sdata,
                   "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
                   reassoc ? "Rea" : "A", assoc_data->ap_addr,
                   capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));

        ifmgd->broken_ap = false;

        if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
            elems->timeout_int &&
            elems->timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
                u32 tu, ms;

                cfg80211_assoc_comeback(sdata->dev, assoc_data->ap_addr,
                                        le32_to_cpu(elems->timeout_int->value));

                tu = le32_to_cpu(elems->timeout_int->value);
                ms = tu * 1024 / 1000;
                sdata_info(sdata,
                           "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
                           assoc_data->ap_addr, tu, ms);
                assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
                assoc_data->timeout_started = true;
                assoc_data->comeback = true;
                if (ms > IEEE80211_ASSOC_TIMEOUT)
                        run_again(sdata, assoc_data->timeout);
                goto notify_driver;
        }

        if (status_code != WLAN_STATUS_SUCCESS) {
                sdata_info(sdata, "%pM denied association (code=%d)\n",
                           assoc_data->ap_addr, status_code);
                event.u.mlme.status = MLME_DENIED;
                event.u.mlme.reason = status_code;
                drv_event_callback(sdata->local, sdata, &event);
        } else {
                if (aid == 0 || aid > max_aid) {
                        sdata_info(sdata,
                                   "invalid AID value %d (out of range), turn off PS\n",
                                   aid);
                        aid = 0;
                        ifmgd->broken_ap = true;
                }

                if (ieee80211_vif_is_mld(&sdata->vif)) {
                        struct ieee80211_mle_basic_common_info *common;

                        if (!elems->ml_basic) {
                                sdata_info(sdata,
                                           "MLO association with %pM but no (basic) multi-link element in response!\n",
                                           assoc_data->ap_addr);
                                goto abandon_assoc;
                        }

                        common = (void *)elems->ml_basic->variable;

                        if (memcmp(assoc_data->ap_addr,
                                   common->mld_mac_addr, ETH_ALEN)) {
                                sdata_info(sdata,
                                           "AP MLD MAC address mismatch: got %pM expected %pM\n",
                                           common->mld_mac_addr,
                                           assoc_data->ap_addr);
                                goto abandon_assoc;
                        }

                        sdata->vif.cfg.eml_cap =
                                ieee80211_mle_get_eml_cap((const void *)elems->ml_basic);
                        sdata->vif.cfg.eml_med_sync_delay =
                                ieee80211_mle_get_eml_med_sync_delay((const void *)elems->ml_basic);
                        sdata->vif.cfg.mld_capa_op =
                                ieee80211_mle_get_mld_capa_op((const void *)elems->ml_basic);
                }

                sdata->vif.cfg.aid = aid;
                sdata->vif.cfg.s1g = assoc_data->s1g;

                if (!ieee80211_assoc_success(sdata, mgmt, elems,
                                             elem_start, elem_len)) {
                        /* oops -- internal error -- send timeout for now */
                        ieee80211_destroy_assoc_data(sdata, ASSOC_TIMEOUT);
                        goto notify_driver;
                }
                event.u.mlme.status = MLME_SUCCESS;
                drv_event_callback(sdata->local, sdata, &event);
                sdata_info(sdata, "associated\n");

                info.success = 1;
        }

        for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
                struct ieee80211_link_data *link;

                if (!assoc_data->link[link_id].bss)
                        continue;

                resp.links[link_id].bss = assoc_data->link[link_id].bss;
                ether_addr_copy(resp.links[link_id].addr,
                                assoc_data->link[link_id].addr);
                resp.links[link_id].status = assoc_data->link[link_id].status;

                link = sdata_dereference(sdata->link[link_id], sdata);
                if (!link)
                        continue;

                /* get uapsd queues configuration - same for all links */
                resp.uapsd_queues = 0;
                for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
                        if (link->tx_conf[ac].uapsd)
                                resp.uapsd_queues |= ieee80211_ac_to_qos_mask[ac];
        }

        if (ieee80211_vif_is_mld(&sdata->vif)) {
                ether_addr_copy(ap_mld_addr, sdata->vif.cfg.ap_addr);
                resp.ap_mld_addr = ap_mld_addr;
        }

        ieee80211_destroy_assoc_data(sdata,
                                     status_code == WLAN_STATUS_SUCCESS ?
                                        ASSOC_SUCCESS :
                                        ASSOC_REJECTED);

        resp.buf = (u8 *)mgmt;
        resp.len = len;
        resp.req_ies = ifmgd->assoc_req_ies;
        resp.req_ies_len = ifmgd->assoc_req_ies_len;
        cfg80211_rx_assoc_resp(sdata->dev, &resp);
notify_driver:
        drv_mgd_complete_tx(sdata->local, sdata, &info);
        kfree(elems);
        return;
abandon_assoc:
        ieee80211_destroy_assoc_data(sdata, ASSOC_ABANDON);
        goto notify_driver;
}

static void ieee80211_rx_bss_info(struct ieee80211_link_data *link,
                                  struct ieee80211_mgmt *mgmt, size_t len,
                                  struct ieee80211_rx_status *rx_status)
{
        struct ieee80211_sub_if_data *sdata = link->sdata;
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_bss *bss;
        struct ieee80211_channel *channel;

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        channel = ieee80211_get_channel_khz(local->hw.wiphy,
                                        ieee80211_rx_status_to_khz(rx_status));
        if (!channel)
                return;

        bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
        if (bss) {
                link->conf->beacon_rate = bss->beacon_rate;
                ieee80211_rx_bss_put(local, bss);
        }
}


static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_link_data *link,
                                         struct sk_buff *skb)
{
        struct ieee80211_sub_if_data *sdata = link->sdata;
        struct ieee80211_mgmt *mgmt = (void *)skb->data;
        struct ieee80211_if_managed *ifmgd;
        struct ieee80211_rx_status *rx_status = (void *) skb->cb;
        struct ieee80211_channel *channel;
        size_t baselen, len = skb->len;

        ifmgd = &sdata->u.mgd;

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        /*
         * According to Draft P802.11ax D6.0 clause 26.17.2.3.2:
         * "If a 6 GHz AP receives a Probe Request frame  and responds with
         * a Probe Response frame [..], the Address 1 field of the Probe
         * Response frame shall be set to the broadcast address [..]"
         * So, on 6GHz band we should also accept broadcast responses.
         */
        channel = ieee80211_get_channel_khz(sdata->local->hw.wiphy,
                                            ieee80211_rx_status_to_khz(rx_status));
        if (!channel)
                return;

        if (!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
            (channel->band != NL80211_BAND_6GHZ ||
             !is_broadcast_ether_addr(mgmt->da)))
                return; /* ignore ProbeResp to foreign address */

        baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
        if (baselen > len)
                return;

        ieee80211_rx_bss_info(link, mgmt, len, rx_status);

        if (ifmgd->associated &&
            ether_addr_equal(mgmt->bssid, link->u.mgd.bssid))
                ieee80211_reset_ap_probe(sdata);
}

/*
 * This is the canonical list of information elements we care about,
 * the filter code also gives us all changes to the Microsoft OUI
 * (00:50:F2) vendor IE which is used for WMM which we need to track,
 * as well as the DTPC IE (part of the Cisco OUI) used for signaling
 * changes to requested client power.
 *
 * We implement beacon filtering in software since that means we can
 * avoid processing the frame here and in cfg80211, and userspace
 * will not be able to tell whether the hardware supports it or not.
 *
 * XXX: This list needs to be dynamic -- userspace needs to be able to
 *      add items it requires. It also needs to be able to tell us to
 *      look out for other vendor IEs.
 */
static const u64 care_about_ies =
        (1ULL << WLAN_EID_COUNTRY) |
        (1ULL << WLAN_EID_ERP_INFO) |
        (1ULL << WLAN_EID_CHANNEL_SWITCH) |
        (1ULL << WLAN_EID_PWR_CONSTRAINT) |
        (1ULL << WLAN_EID_HT_CAPABILITY) |
        (1ULL << WLAN_EID_HT_OPERATION) |
        (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);

static void ieee80211_handle_beacon_sig(struct ieee80211_link_data *link,
                                        struct ieee80211_if_managed *ifmgd,
                                        struct ieee80211_bss_conf *bss_conf,
                                        struct ieee80211_local *local,
                                        struct ieee80211_rx_status *rx_status)
{
        struct ieee80211_sub_if_data *sdata = link->sdata;

        /* Track average RSSI from the Beacon frames of the current AP */

        if (!link->u.mgd.tracking_signal_avg) {
                link->u.mgd.tracking_signal_avg = true;
                ewma_beacon_signal_init(&link->u.mgd.ave_beacon_signal);
                link->u.mgd.last_cqm_event_signal = 0;
                link->u.mgd.count_beacon_signal = 1;
                link->u.mgd.last_ave_beacon_signal = 0;
        } else {
                link->u.mgd.count_beacon_signal++;
        }

        ewma_beacon_signal_add(&link->u.mgd.ave_beacon_signal,
                               -rx_status->signal);

        if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
            link->u.mgd.count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
                int sig = -ewma_beacon_signal_read(&link->u.mgd.ave_beacon_signal);
                int last_sig = link->u.mgd.last_ave_beacon_signal;
                struct ieee80211_event event = {
                        .type = RSSI_EVENT,
                };

                /*
                 * if signal crosses either of the boundaries, invoke callback
                 * with appropriate parameters
                 */
                if (sig > ifmgd->rssi_max_thold &&
                    (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
                        link->u.mgd.last_ave_beacon_signal = sig;
                        event.u.rssi.data = RSSI_EVENT_HIGH;
                        drv_event_callback(local, sdata, &event);
                } else if (sig < ifmgd->rssi_min_thold &&
                           (last_sig >= ifmgd->rssi_max_thold ||
                           last_sig == 0)) {
                        link->u.mgd.last_ave_beacon_signal = sig;
                        event.u.rssi.data = RSSI_EVENT_LOW;
                        drv_event_callback(local, sdata, &event);
                }
        }

        if (bss_conf->cqm_rssi_thold &&
            link->u.mgd.count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
            !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
                int sig = -ewma_beacon_signal_read(&link->u.mgd.ave_beacon_signal);
                int last_event = link->u.mgd.last_cqm_event_signal;
                int thold = bss_conf->cqm_rssi_thold;
                int hyst = bss_conf->cqm_rssi_hyst;

                if (sig < thold &&
                    (last_event == 0 || sig < last_event - hyst)) {
                        link->u.mgd.last_cqm_event_signal = sig;
                        ieee80211_cqm_rssi_notify(
                                &sdata->vif,
                                NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
                                sig, GFP_KERNEL);
                } else if (sig > thold &&
                           (last_event == 0 || sig > last_event + hyst)) {
                        link->u.mgd.last_cqm_event_signal = sig;
                        ieee80211_cqm_rssi_notify(
                                &sdata->vif,
                                NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
                                sig, GFP_KERNEL);
                }
        }

        if (bss_conf->cqm_rssi_low &&
            link->u.mgd.count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
                int sig = -ewma_beacon_signal_read(&link->u.mgd.ave_beacon_signal);
                int last_event = link->u.mgd.last_cqm_event_signal;
                int low = bss_conf->cqm_rssi_low;
                int high = bss_conf->cqm_rssi_high;

                if (sig < low &&
                    (last_event == 0 || last_event >= low)) {
                        link->u.mgd.last_cqm_event_signal = sig;
                        ieee80211_cqm_rssi_notify(
                                &sdata->vif,
                                NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
                                sig, GFP_KERNEL);
                } else if (sig > high &&
                           (last_event == 0 || last_event <= high)) {
                        link->u.mgd.last_cqm_event_signal = sig;
                        ieee80211_cqm_rssi_notify(
                                &sdata->vif,
                                NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
                                sig, GFP_KERNEL);
                }
        }
}

static bool ieee80211_rx_our_beacon(const u8 *tx_bssid,
                                    struct cfg80211_bss *bss)
{
        if (ether_addr_equal(tx_bssid, bss->bssid))
                return true;
        if (!bss->transmitted_bss)
                return false;
        return ether_addr_equal(tx_bssid, bss->transmitted_bss->bssid);
}

static void ieee80211_ml_reconf_work(struct wiphy *wiphy,
                                     struct wiphy_work *work)
{
        struct ieee80211_sub_if_data *sdata =
                container_of(work, struct ieee80211_sub_if_data,
                             u.mgd.ml_reconf_work.work);
        u16 new_valid_links, new_active_links, new_dormant_links;
        int ret;

        if (!sdata->u.mgd.removed_links)
                return;

        sdata_info(sdata,
                   "MLO Reconfiguration: work: valid=0x%x, removed=0x%x\n",
                   sdata->vif.valid_links, sdata->u.mgd.removed_links);

        new_valid_links = sdata->vif.valid_links & ~sdata->u.mgd.removed_links;
        if (new_valid_links == sdata->vif.valid_links)
                return;

        if (!new_valid_links ||
            !(new_valid_links & ~sdata->vif.dormant_links)) {
                sdata_info(sdata, "No valid links after reconfiguration\n");
                ret = -EINVAL;
                goto out;
        }

        new_active_links = sdata->vif.active_links & ~sdata->u.mgd.removed_links;
        if (new_active_links != sdata->vif.active_links) {
                if (!new_active_links)
                        new_active_links =
                                BIT(ffs(new_valid_links &
                                        ~sdata->vif.dormant_links) - 1);

                ret = ieee80211_set_active_links(&sdata->vif, new_active_links);
                if (ret) {
                        sdata_info(sdata,
                                   "Failed setting active links\n");
                        goto out;
                }
        }

        new_dormant_links = sdata->vif.dormant_links & ~sdata->u.mgd.removed_links;

        ret = ieee80211_vif_set_links(sdata, new_valid_links,
                                      new_dormant_links);
        if (ret)
                sdata_info(sdata, "Failed setting valid links\n");

        ieee80211_vif_cfg_change_notify(sdata, BSS_CHANGED_MLD_VALID_LINKS);

out:
        if (!ret)
                cfg80211_links_removed(sdata->dev, sdata->u.mgd.removed_links);
        else
                __ieee80211_disconnect(sdata);

        sdata->u.mgd.removed_links = 0;
}

static void ieee80211_ml_reconfiguration(struct ieee80211_sub_if_data *sdata,
                                         struct ieee802_11_elems *elems)
{
        const struct element *sub;
        unsigned long removed_links = 0;
        u16 link_removal_timeout[IEEE80211_MLD_MAX_NUM_LINKS] = {};
        u8 link_id;
        u32 delay;

        if (!ieee80211_vif_is_mld(&sdata->vif) || !elems->ml_reconf)
                return;

        /* Directly parse the sub elements as the common information doesn't
         * hold any useful information.
         */
        for_each_mle_subelement(sub, (const u8 *)elems->ml_reconf,
                                elems->ml_reconf_len) {
                struct ieee80211_mle_per_sta_profile *prof = (void *)sub->data;
                u8 *pos = prof->variable;
                u16 control;

                if (sub->id != IEEE80211_MLE_SUBELEM_PER_STA_PROFILE)
                        continue;

                if (!ieee80211_mle_reconf_sta_prof_size_ok(sub->data,
                                                           sub->datalen))
                        return;

                control = le16_to_cpu(prof->control);
                link_id = control & IEEE80211_MLE_STA_RECONF_CONTROL_LINK_ID;

                if (link_id >= IEEE80211_MLD_MAX_NUM_LINKS)
                        continue;

                removed_links |= BIT(link_id);

                /* the MAC address should not be included, but handle it */
                if (control &
                    IEEE80211_MLE_STA_RECONF_CONTROL_STA_MAC_ADDR_PRESENT)
                        pos += 6;

                /* According to Draft P802.11be_D3.0, the control should
                 * include the AP Removal Timer present. If the AP Removal Timer
                 * is not present assume immediate removal.
                 */
                if (control &
                    IEEE80211_MLE_STA_RECONF_CONTROL_AP_REM_TIMER_PRESENT)
                        link_removal_timeout[link_id] = get_unaligned_le16(pos);
        }

        removed_links &= sdata->vif.valid_links;
        if (!removed_links) {
                /* In case the removal was cancelled, abort it */
                if (sdata->u.mgd.removed_links) {
                        sdata->u.mgd.removed_links = 0;
                        wiphy_hrtimer_work_cancel(sdata->local->hw.wiphy,
                                                  &sdata->u.mgd.ml_reconf_work);
                }
                return;
        }

        delay = 0;
        for_each_set_bit(link_id, &removed_links, IEEE80211_MLD_MAX_NUM_LINKS) {
                struct ieee80211_bss_conf *link_conf =
                        sdata_dereference(sdata->vif.link_conf[link_id], sdata);
                u32 link_delay;

                if (!link_conf) {
                        removed_links &= ~BIT(link_id);
                        continue;
                }

                if (link_removal_timeout[link_id] < 1)
                        link_delay = 0;
                else
                        link_delay = link_conf->beacon_int *
                                (link_removal_timeout[link_id] - 1);

                if (!delay)
                        delay = link_delay;
                else
                        delay = min(delay, link_delay);
        }

        sdata->u.mgd.removed_links = removed_links;
        wiphy_hrtimer_work_queue(sdata->local->hw.wiphy,
                                 &sdata->u.mgd.ml_reconf_work,
                                 us_to_ktime(ieee80211_tu_to_usec(delay)));
}

static int ieee80211_ttlm_set_links(struct ieee80211_sub_if_data *sdata,
                                    u16 active_links, u16 dormant_links,
                                    u16 suspended_links)
{
        u64 changed = 0;
        int ret;

        if (!active_links) {
                ret = -EINVAL;
                goto out;
        }

        /* If there is an active negotiated TTLM, it should be discarded by
         * the new negotiated/advertised TTLM.
         */
        if (sdata->vif.neg_ttlm.valid) {
                memset(&sdata->vif.neg_ttlm, 0, sizeof(sdata->vif.neg_ttlm));
                sdata->vif.suspended_links = 0;
                changed = BSS_CHANGED_MLD_TTLM;
        }

        if (sdata->vif.active_links != active_links) {
                /* usable links are affected when active_links are changed,
                 * so notify the driver about the status change
                 */
                changed |= BSS_CHANGED_MLD_VALID_LINKS;
                active_links &= sdata->vif.active_links;
                if (!active_links)
                        active_links =
                                BIT(__ffs(sdata->vif.valid_links &
                                    ~dormant_links));
                ret = ieee80211_set_active_links(&sdata->vif, active_links);
                if (ret) {
                        sdata_info(sdata, "Failed to set TTLM active links\n");
                        goto out;
                }
        }

        ret = ieee80211_vif_set_links(sdata, sdata->vif.valid_links,
                                      dormant_links);
        if (ret) {
                sdata_info(sdata, "Failed to set TTLM dormant links\n");
                goto out;
        }

        sdata->vif.suspended_links = suspended_links;
        if (sdata->vif.suspended_links)
                changed |= BSS_CHANGED_MLD_TTLM;

        ieee80211_vif_cfg_change_notify(sdata, changed);

out:
        if (ret)
                ieee80211_disconnect(&sdata->vif, false);

        return ret;
}

static void ieee80211_tid_to_link_map_work(struct wiphy *wiphy,
                                           struct wiphy_work *work)
{
        u16 new_active_links, new_dormant_links;
        struct ieee80211_sub_if_data *sdata =
                container_of(work, struct ieee80211_sub_if_data,
                             u.mgd.ttlm_work.work);

        new_active_links = sdata->u.mgd.ttlm_info.map &
                           sdata->vif.valid_links;
        new_dormant_links = ~sdata->u.mgd.ttlm_info.map &
                            sdata->vif.valid_links;

        ieee80211_vif_set_links(sdata, sdata->vif.valid_links, 0);
        if (ieee80211_ttlm_set_links(sdata, new_active_links, new_dormant_links,
                                     0))
                return;

        sdata->u.mgd.ttlm_info.active = true;
        sdata->u.mgd.ttlm_info.switch_time = 0;
}

static void ieee80211_process_adv_ttlm(struct ieee80211_sub_if_data *sdata,
                                          struct ieee802_11_elems *elems,
                                          u64 beacon_ts)
{
        u8 i;
        int ret;

        if (!ieee80211_vif_is_mld(&sdata->vif))
                return;

        if (!elems->ttlm_num) {
                if (sdata->u.mgd.ttlm_info.switch_time) {
                        /* if a planned TID-to-link mapping was cancelled -
                         * abort it
                         */
                        wiphy_hrtimer_work_cancel(sdata->local->hw.wiphy,
                                                  &sdata->u.mgd.ttlm_work);
                } else if (sdata->u.mgd.ttlm_info.active) {
                        /* if no TID-to-link element, set to default mapping in
                         * which all TIDs are mapped to all setup links
                         */
                        ret = ieee80211_vif_set_links(sdata,
                                                      sdata->vif.valid_links,
                                                      0);
                        if (ret) {
                                sdata_info(sdata, "Failed setting valid/dormant links\n");
                                return;
                        }
                        ieee80211_vif_cfg_change_notify(sdata,
                                                        BSS_CHANGED_MLD_VALID_LINKS);
                }
                memset(&sdata->u.mgd.ttlm_info, 0,
                       sizeof(sdata->u.mgd.ttlm_info));
                return;
        }

        for (i = 0; i < elems->ttlm_num; i++) {
                struct ieee80211_adv_ttlm_info ttlm_info;
                u32 res;

                res = ieee80211_parse_adv_t2l(sdata, elems->ttlm[i],
                                              &ttlm_info);

                if (res) {
                        __ieee80211_disconnect(sdata);
                        return;
                }

                if (ttlm_info.switch_time) {
                        u16 beacon_ts_tu, st_tu, delay;
                        u64 delay_usec;
                        u64 mask;

                        /* The t2l map switch time is indicated with a partial
                         * TSF value (bits 10 to 25), get the partial beacon TS
                         * as well, and calc the delay to the start time.
                         */
                        mask = GENMASK_ULL(25, 10);
                        beacon_ts_tu = (beacon_ts & mask) >> 10;
                        st_tu = ttlm_info.switch_time;
                        delay = st_tu - beacon_ts_tu;

                        /*
                         * If the switch time is far in the future, then it
                         * could also be the previous switch still being
                         * announced.
                         * We can simply ignore it for now, if it is a future
                         * switch the AP will continue to announce it anyway.
                         */
                        if (delay > IEEE80211_ADV_TTLM_ST_UNDERFLOW)
                                return;

                        delay_usec = ieee80211_tu_to_usec(delay);

                        /* Link switching can take time, so schedule it
                         * 100ms before to be ready on time
                         */
                        if (delay_usec > IEEE80211_ADV_TTLM_SAFETY_BUFFER_MS)
                                delay_usec -=
                                        IEEE80211_ADV_TTLM_SAFETY_BUFFER_MS;
                        else
                                delay_usec = 0;

                        sdata->u.mgd.ttlm_info = ttlm_info;
                        wiphy_hrtimer_work_cancel(sdata->local->hw.wiphy,
                                                  &sdata->u.mgd.ttlm_work);
                        wiphy_hrtimer_work_queue(sdata->local->hw.wiphy,
                                                 &sdata->u.mgd.ttlm_work,
                                                 us_to_ktime(delay_usec));
                        return;
                }
        }
}

static void
ieee80211_mgd_check_cross_link_csa(struct ieee80211_sub_if_data *sdata,
                                   int reporting_link_id,
                                   struct ieee802_11_elems *elems)
{
        const struct element *sta_profiles[IEEE80211_MLD_MAX_NUM_LINKS] = {};
        ssize_t sta_profiles_len[IEEE80211_MLD_MAX_NUM_LINKS] = {};
        const struct element *sub;
        const u8 *subelems;
        size_t subelems_len;
        u8 common_size;
        int link_id;

        if (!ieee80211_mle_size_ok((u8 *)elems->ml_basic, elems->ml_basic_len))
                return;

        common_size = ieee80211_mle_common_size((u8 *)elems->ml_basic);
        subelems = (u8 *)elems->ml_basic + common_size;
        subelems_len = elems->ml_basic_len - common_size;

        for_each_element_id(sub, IEEE80211_MLE_SUBELEM_PER_STA_PROFILE,
                            subelems, subelems_len) {
                struct ieee80211_mle_per_sta_profile *prof = (void *)sub->data;
                struct ieee80211_link_data *link;
                ssize_t len;

                if (!ieee80211_mle_basic_sta_prof_size_ok(sub->data,
                                                          sub->datalen))
                        continue;

                link_id = le16_get_bits(prof->control,
                                        IEEE80211_MLE_STA_CONTROL_LINK_ID);
                /* need a valid link ID, but also not our own, both AP bugs */
                if (link_id == reporting_link_id ||
                    link_id >= IEEE80211_MLD_MAX_NUM_LINKS)
                        continue;

                link = sdata_dereference(sdata->link[link_id], sdata);
                if (!link)
                        continue;

                len = cfg80211_defragment_element(sub, subelems, subelems_len,
                                                  NULL, 0,
                                                  IEEE80211_MLE_SUBELEM_FRAGMENT);
                if (WARN_ON(len < 0))
                        continue;

                sta_profiles[link_id] = sub;
                sta_profiles_len[link_id] = len;
        }

        for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
                struct ieee80211_mle_per_sta_profile *prof;
                struct ieee802_11_elems *prof_elems;
                struct ieee80211_link_data *link;
                ssize_t len;

                if (link_id == reporting_link_id)
                        continue;

                link = sdata_dereference(sdata->link[link_id], sdata);
                if (!link)
                        continue;

                if (!sta_profiles[link_id]) {
                        prof_elems = NULL;
                        goto handle;
                }

                /* we can defragment in-place, won't use the buffer again */
                len = cfg80211_defragment_element(sta_profiles[link_id],
                                                  subelems, subelems_len,
                                                  (void *)sta_profiles[link_id],
                                                  sta_profiles_len[link_id],
                                                  IEEE80211_MLE_SUBELEM_FRAGMENT);
                if (WARN_ON(len != sta_profiles_len[link_id]))
                        continue;

                prof = (void *)sta_profiles[link_id];
                prof_elems = ieee802_11_parse_elems(prof->variable +
                                                    (prof->sta_info_len - 1),
                                                    len -
                                                    (prof->sta_info_len - 1),
                                                    IEEE80211_FTYPE_MGMT |
                                                    IEEE80211_STYPE_BEACON,
                                                    NULL);

                /* memory allocation failed - let's hope that's transient */
                if (!prof_elems)
                        continue;

handle:
                /*
                 * FIXME: the timings here are obviously incorrect,
                 * but only older Intel drivers seem to care, and
                 * those don't have MLO. If you really need this,
                 * the problem is having to calculate it with the
                 * TSF offset etc. The device_timestamp is still
                 * correct, of course.
                 */
                ieee80211_sta_process_chanswitch(link, 0, 0, elems, prof_elems,
                                                 IEEE80211_CSA_SOURCE_OTHER_LINK);
                kfree(prof_elems);
        }
}

static bool ieee80211_mgd_ssid_mismatch(struct ieee80211_sub_if_data *sdata,
                                        const struct ieee802_11_elems *elems)
{
        struct ieee80211_vif_cfg *cfg = &sdata->vif.cfg;
        static u8 zero_ssid[IEEE80211_MAX_SSID_LEN];

        if (!elems->ssid)
                return false;

        /* hidden SSID: zero length */
        if (elems->ssid_len == 0)
                return false;

        if (elems->ssid_len != cfg->ssid_len)
                return true;

        /* hidden SSID: zeroed out */
        if (!memcmp(elems->ssid, zero_ssid, elems->ssid_len))
                return false;

        return memcmp(elems->ssid, cfg->ssid, cfg->ssid_len);
}

static bool
ieee80211_rx_beacon_freq_valid(struct ieee80211_local *local,
                               struct ieee80211_mgmt *mgmt,
                               struct ieee80211_rx_status *rx_status,
                               struct ieee80211_chanctx_conf *chanctx)
{
        u32 pri_2mhz_khz;
        struct ieee80211_channel *s1g_sibling_1mhz;
        u32 pri_khz = ieee80211_channel_to_khz(chanctx->def.chan);
        u32 rx_khz = ieee80211_rx_status_to_khz(rx_status);

        if (rx_khz == pri_khz)
                return true;

        if (!chanctx->def.s1g_primary_2mhz)
                return false;

        /*
         * If we have an S1G interface with a 2MHz primary, beacons are
         * sent on the center frequency of the 2MHz primary. Find the sibling
         * 1MHz channel and calculate the 2MHz primary center frequency.
         */
        s1g_sibling_1mhz = cfg80211_s1g_get_primary_sibling(local->hw.wiphy,
                                                            &chanctx->def);
        if (!s1g_sibling_1mhz)
                return false;

        pri_2mhz_khz =
                (pri_khz + ieee80211_channel_to_khz(s1g_sibling_1mhz)) / 2;
        return rx_khz == pri_2mhz_khz;
}

static void ieee80211_rx_mgmt_beacon(struct ieee80211_link_data *link,
                                     struct ieee80211_hdr *hdr, size_t len,
                                     struct ieee80211_rx_status *rx_status)
{
        struct ieee80211_sub_if_data *sdata = link->sdata;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct ieee80211_bss_conf *bss_conf = link->conf;
        struct ieee80211_vif_cfg *vif_cfg = &sdata->vif.cfg;
        struct ieee80211_mgmt *mgmt = (void *) hdr;
        struct ieee80211_ext *ext = NULL;
        size_t baselen;
        struct ieee802_11_elems *elems;
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_chanctx_conf *chanctx_conf;
        struct ieee80211_supported_band *sband;
        struct ieee80211_channel *chan;
        struct link_sta_info *link_sta;
        struct sta_info *sta;
        u64 changed = 0;
        bool erp_valid;
        u8 erp_value = 0;
        u32 ncrc = 0;
        u8 *bssid, *variable = mgmt->u.beacon.variable;
        u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
        struct ieee80211_elems_parse_params parse_params = {
                .mode = link->u.mgd.conn.mode,
                .link_id = -1,
                .from_ap = true,
                .type = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_TYPE,
        };

        lockdep_assert_wiphy(local->hw.wiphy);

        /* Process beacon from the current BSS */
        bssid = ieee80211_get_bssid(hdr, len, sdata->vif.type);
        if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
                ext = (void *)mgmt;
                variable = ext->u.s1g_beacon.variable +
                           ieee80211_s1g_optional_len(ext->frame_control);
        }

        baselen = (u8 *) variable - (u8 *) mgmt;
        if (baselen > len)
                return;

        parse_params.start = variable;
        parse_params.len = len - baselen;

        rcu_read_lock();
        chanctx_conf = rcu_dereference(bss_conf->chanctx_conf);
        if (!chanctx_conf) {
                rcu_read_unlock();
                return;
        }

        if (!ieee80211_rx_beacon_freq_valid(local, mgmt, rx_status,
                                            chanctx_conf)) {
                rcu_read_unlock();
                return;
        }
        chan = chanctx_conf->def.chan;
        rcu_read_unlock();

        if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
            !WARN_ON(ieee80211_vif_is_mld(&sdata->vif)) &&
            ieee80211_rx_our_beacon(bssid, ifmgd->assoc_data->link[0].bss)) {
                parse_params.bss = ifmgd->assoc_data->link[0].bss;
                elems = ieee802_11_parse_elems_full(&parse_params);
                if (!elems)
                        return;

                ieee80211_rx_bss_info(link, mgmt, len, rx_status);

                if (elems->dtim_period)
                        link->u.mgd.dtim_period = elems->dtim_period;
                link->u.mgd.have_beacon = true;
                ifmgd->assoc_data->need_beacon = false;
                if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY) &&
                    !ieee80211_is_s1g_beacon(hdr->frame_control)) {
                        bss_conf->sync_tsf =
                                le64_to_cpu(mgmt->u.beacon.timestamp);
                        bss_conf->sync_device_ts =
                                rx_status->device_timestamp;
                        bss_conf->sync_dtim_count = elems->dtim_count;
                }

                if (elems->mbssid_config_ie)
                        bss_conf->profile_periodicity =
                                elems->mbssid_config_ie->profile_periodicity;
                else
                        bss_conf->profile_periodicity = 0;

                if (elems->ext_capab_len >= 11 &&
                    (elems->ext_capab[10] & WLAN_EXT_CAPA11_EMA_SUPPORT))
                        bss_conf->ema_ap = true;
                else
                        bss_conf->ema_ap = false;

                /* continue assoc process */
                ifmgd->assoc_data->timeout = jiffies;
                ifmgd->assoc_data->timeout_started = true;
                run_again(sdata, ifmgd->assoc_data->timeout);
                kfree(elems);
                return;
        }

        if (!ifmgd->associated ||
            !ieee80211_rx_our_beacon(bssid, bss_conf->bss))
                return;
        bssid = link->u.mgd.bssid;

        if (!(rx_status->flag & RX_FLAG_NO_SIGNAL_VAL))
                ieee80211_handle_beacon_sig(link, ifmgd, bss_conf,
                                            local, rx_status);

        if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
                mlme_dbg_ratelimited(sdata,
                                     "cancelling AP probe due to a received beacon\n");
                ieee80211_reset_ap_probe(sdata);
        }

        /*
         * Push the beacon loss detection into the future since
         * we are processing a beacon from the AP just now.
         */
        ieee80211_sta_reset_beacon_monitor(sdata);

        /* TODO: CRC urrently not calculated on S1G Beacon Compatibility
         * element (which carries the beacon interval). Don't forget to add a
         * bit to care_about_ies[] above if mac80211 is interested in a
         * changing S1G element.
         */
        if (!ieee80211_is_s1g_beacon(hdr->frame_control))
                ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
        parse_params.bss = bss_conf->bss;
        parse_params.filter = care_about_ies;
        parse_params.crc = ncrc;
        elems = ieee802_11_parse_elems_full(&parse_params);
        if (!elems)
                return;

        if (rx_status->flag & RX_FLAG_DECRYPTED &&
            ieee80211_mgd_ssid_mismatch(sdata, elems)) {
                sdata_info(sdata, "SSID mismatch for AP %pM, disconnect\n",
                           sdata->vif.cfg.ap_addr);
                __ieee80211_disconnect(sdata);
                return;
        }

        ncrc = elems->crc;

        if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
            ieee80211_check_tim(elems->tim, elems->tim_len, vif_cfg->aid,
                                vif_cfg->s1g)) {
                if (local->hw.conf.dynamic_ps_timeout > 0) {
                        if (local->hw.conf.flags & IEEE80211_CONF_PS) {
                                local->hw.conf.flags &= ~IEEE80211_CONF_PS;
                                ieee80211_hw_config(local, -1,
                                                    IEEE80211_CONF_CHANGE_PS);
                        }
                        ieee80211_send_nullfunc(local, sdata, false);
                } else if (!local->pspolling && sdata->u.mgd.powersave) {
                        local->pspolling = true;

                        /*
                         * Here is assumed that the driver will be
                         * able to send ps-poll frame and receive a
                         * response even though power save mode is
                         * enabled, but some drivers might require
                         * to disable power save here. This needs
                         * to be investigated.
                         */
                        ieee80211_send_pspoll(local, sdata);
                }
        }

        if (sdata->vif.p2p ||
            sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
                struct ieee80211_p2p_noa_attr noa = {};
                int ret;

                ret = cfg80211_get_p2p_attr(variable,
                                            len - baselen,
                                            IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
                                            (u8 *) &noa, sizeof(noa));
                if (ret >= 2) {
                        if (link->u.mgd.p2p_noa_index != noa.index) {
                                /* valid noa_attr and index changed */
                                link->u.mgd.p2p_noa_index = noa.index;
                                memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
                                changed |= BSS_CHANGED_P2P_PS;
                                /*
                                 * make sure we update all information, the CRC
                                 * mechanism doesn't look at P2P attributes.
                                 */
                                link->u.mgd.beacon_crc_valid = false;
                        }
                } else if (link->u.mgd.p2p_noa_index != -1) {
                        /* noa_attr not found and we had valid noa_attr before */
                        link->u.mgd.p2p_noa_index = -1;
                        memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
                        changed |= BSS_CHANGED_P2P_PS;
                        link->u.mgd.beacon_crc_valid = false;
                }
        }

        /*
         * Update beacon timing and dtim count on every beacon appearance. This
         * will allow the driver to use the most updated values. Do it before
         * comparing this one with last received beacon.
         * IMPORTANT: These parameters would possibly be out of sync by the time
         * the driver will use them. The synchronized view is currently
         * guaranteed only in certain callbacks.
         */
        if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY) &&
            !ieee80211_is_s1g_beacon(hdr->frame_control)) {
                bss_conf->sync_tsf =
                        le64_to_cpu(mgmt->u.beacon.timestamp);
                bss_conf->sync_device_ts =
                        rx_status->device_timestamp;
                bss_conf->sync_dtim_count = elems->dtim_count;
        }

        if ((ncrc == link->u.mgd.beacon_crc && link->u.mgd.beacon_crc_valid) ||
            (ext && ieee80211_is_s1g_short_beacon(ext->frame_control,
                                                  parse_params.start,
                                                  parse_params.len)))
                goto free;
        link->u.mgd.beacon_crc = ncrc;
        link->u.mgd.beacon_crc_valid = true;

        ieee80211_rx_bss_info(link, mgmt, len, rx_status);

        ieee80211_sta_process_chanswitch(link, rx_status->mactime,
                                         rx_status->device_timestamp,
                                         elems, elems,
                                         IEEE80211_CSA_SOURCE_BEACON);

        /* note that after this elems->ml_basic can no longer be used fully */
        ieee80211_mgd_check_cross_link_csa(sdata, rx_status->link_id, elems);

        ieee80211_mgd_update_bss_param_ch_cnt(sdata, bss_conf, elems);

        if (!sdata->u.mgd.epcs.enabled &&
            !link->u.mgd.disable_wmm_tracking &&
            ieee80211_sta_wmm_params(local, link, elems->wmm_param,
                                     elems->wmm_param_len,
                                     elems->mu_edca_param_set))
                changed |= BSS_CHANGED_QOS;

        /*
         * If we haven't had a beacon before, tell the driver about the
         * DTIM period (and beacon timing if desired) now.
         */
        if (!link->u.mgd.have_beacon) {
                /* a few bogus AP send dtim_period = 0 or no TIM IE */
                bss_conf->dtim_period = elems->dtim_period ?: 1;

                changed |= BSS_CHANGED_BEACON_INFO;
                link->u.mgd.have_beacon = true;

                ieee80211_recalc_ps(local);

                ieee80211_recalc_ps_vif(sdata);
        }

        if (elems->erp_info) {
                erp_valid = true;
                erp_value = elems->erp_info[0];
        } else {
                erp_valid = false;
        }

        if (!ieee80211_is_s1g_beacon(hdr->frame_control))
                changed |= ieee80211_handle_bss_capability(link,
                                le16_to_cpu(mgmt->u.beacon.capab_info),
                                erp_valid, erp_value);

        sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr);
        if (WARN_ON(!sta)) {
                goto free;
        }
        link_sta = rcu_dereference_protected(sta->link[link->link_id],
                                             lockdep_is_held(&local->hw.wiphy->mtx));
        if (WARN_ON(!link_sta)) {
                goto free;
        }

        if (WARN_ON(!bss_conf->chanreq.oper.chan))
                goto free;

        sband = local->hw.wiphy->bands[bss_conf->chanreq.oper.chan->band];

        changed |= ieee80211_recalc_twt_req(sdata, sband, link, link_sta, elems);

        if (ieee80211_config_bw(link, elems, true, &changed,
                                IEEE80211_STYPE_BEACON)) {
                ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
                                       WLAN_REASON_DEAUTH_LEAVING,
                                       true, deauth_buf);
                ieee80211_report_disconnect(sdata, deauth_buf,
                                            sizeof(deauth_buf), true,
                                            WLAN_REASON_DEAUTH_LEAVING,
                                            false);
                goto free;
        }

        if (elems->opmode_notif)
                ieee80211_vht_handle_opmode(sdata, link_sta,
                                            *elems->opmode_notif,
                                            rx_status->band);

        changed |= ieee80211_handle_pwr_constr(link, chan, mgmt,
                                               elems->country_elem,
                                               elems->country_elem_len,
                                               elems->pwr_constr_elem,
                                               elems->cisco_dtpc_elem);

        ieee80211_ml_reconfiguration(sdata, elems);
        ieee80211_process_adv_ttlm(sdata, elems,
                                      le64_to_cpu(mgmt->u.beacon.timestamp));

        ieee80211_link_info_change_notify(sdata, link, changed);
free:
        kfree(elems);
}

static void ieee80211_apply_neg_ttlm(struct ieee80211_sub_if_data *sdata,
                                     struct ieee80211_neg_ttlm neg_ttlm)
{
        u16 new_active_links, new_dormant_links, new_suspended_links, map = 0;
        u8 i;

        for (i = 0; i < IEEE80211_TTLM_NUM_TIDS; i++)
                map |= neg_ttlm.downlink[i] | neg_ttlm.uplink[i];

        /* If there is an active TTLM, unset previously suspended links */
        if (sdata->vif.neg_ttlm.valid)
                sdata->vif.dormant_links &= ~sdata->vif.suspended_links;

        /* exclude links that are already disabled by advertised TTLM */
        new_active_links =
                map & sdata->vif.valid_links & ~sdata->vif.dormant_links;
        new_suspended_links =
                (~map & sdata->vif.valid_links) & ~sdata->vif.dormant_links;
        new_dormant_links = sdata->vif.dormant_links | new_suspended_links;
        if (ieee80211_ttlm_set_links(sdata, new_active_links,
                                     new_dormant_links, new_suspended_links))
                return;

        sdata->vif.neg_ttlm = neg_ttlm;
        sdata->vif.neg_ttlm.valid = true;
}

static void ieee80211_neg_ttlm_timeout_work(struct wiphy *wiphy,
                                            struct wiphy_work *work)
{
        struct ieee80211_sub_if_data *sdata =
                container_of(work, struct ieee80211_sub_if_data,
                             u.mgd.neg_ttlm_timeout_work.work);

        sdata_info(sdata,
                   "No negotiated TTLM response from AP, disconnecting.\n");

        __ieee80211_disconnect(sdata);
}

static void
ieee80211_neg_ttlm_add_suggested_map(struct sk_buff *skb,
                                     struct ieee80211_neg_ttlm *neg_ttlm)
{
        u8 i, direction[IEEE80211_TTLM_MAX_CNT];

        if (memcmp(neg_ttlm->downlink, neg_ttlm->uplink,
                   sizeof(neg_ttlm->downlink))) {
                direction[0] = IEEE80211_TTLM_DIRECTION_DOWN;
                direction[1] = IEEE80211_TTLM_DIRECTION_UP;
        } else {
                direction[0] = IEEE80211_TTLM_DIRECTION_BOTH;
        }

        for (i = 0; i < ARRAY_SIZE(direction); i++) {
                u8 tid, len, map_ind = 0, *len_pos, *map_ind_pos, *pos;
                __le16 map;

                len = sizeof(struct ieee80211_ttlm_elem) + 1 + 1;

                pos = skb_put(skb, len + 2);
                *pos++ = WLAN_EID_EXTENSION;
                len_pos = pos++;
                *pos++ = WLAN_EID_EXT_TID_TO_LINK_MAPPING;
                *pos++ = direction[i];
                map_ind_pos = pos++;
                for (tid = 0; tid < IEEE80211_TTLM_NUM_TIDS; tid++) {
                        map = direction[i] == IEEE80211_TTLM_DIRECTION_UP ?
                                cpu_to_le16(neg_ttlm->uplink[tid]) :
                                cpu_to_le16(neg_ttlm->downlink[tid]);
                        if (!map)
                                continue;

                        len += 2;
                        map_ind |= BIT(tid);
                        skb_put_data(skb, &map, sizeof(map));
                }

                *map_ind_pos = map_ind;
                *len_pos = len;

                if (direction[i] == IEEE80211_TTLM_DIRECTION_BOTH)
                        break;
        }
}

static void
ieee80211_send_neg_ttlm_req(struct ieee80211_sub_if_data *sdata,
                            struct ieee80211_neg_ttlm *neg_ttlm,
                            u8 dialog_token)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_mgmt *mgmt;
        struct sk_buff *skb;
        int hdr_len = offsetofend(struct ieee80211_mgmt, u.action.u.ttlm_req);
        int ttlm_max_len = 2 + 1 + sizeof(struct ieee80211_ttlm_elem) + 1 +
                2 * 2 * IEEE80211_TTLM_NUM_TIDS;

        skb = dev_alloc_skb(local->tx_headroom + hdr_len + ttlm_max_len);
        if (!skb)
                return;

        skb_reserve(skb, local->tx_headroom);
        mgmt = skb_put_zero(skb, hdr_len);
        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                                          IEEE80211_STYPE_ACTION);
        memcpy(mgmt->da, sdata->vif.cfg.ap_addr, ETH_ALEN);
        memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
        memcpy(mgmt->bssid, sdata->vif.cfg.ap_addr, ETH_ALEN);

        mgmt->u.action.category = WLAN_CATEGORY_PROTECTED_EHT;
        mgmt->u.action.u.ttlm_req.action_code =
                WLAN_PROTECTED_EHT_ACTION_TTLM_REQ;
        mgmt->u.action.u.ttlm_req.dialog_token = dialog_token;
        ieee80211_neg_ttlm_add_suggested_map(skb, neg_ttlm);
        ieee80211_tx_skb(sdata, skb);
}

int ieee80211_req_neg_ttlm(struct ieee80211_sub_if_data *sdata,
                           struct cfg80211_ttlm_params *params)
{
        struct ieee80211_neg_ttlm neg_ttlm = {};
        u8 i;

        if (!ieee80211_vif_is_mld(&sdata->vif) ||
            !(sdata->vif.cfg.mld_capa_op &
              IEEE80211_MLD_CAP_OP_TID_TO_LINK_MAP_NEG_SUPP))
                return -EINVAL;

        for (i = 0; i < IEEE80211_TTLM_NUM_TIDS; i++) {
                if ((params->dlink[i] & ~sdata->vif.valid_links) ||
                    (params->ulink[i] & ~sdata->vif.valid_links))
                        return -EINVAL;

                neg_ttlm.downlink[i] = params->dlink[i];
                neg_ttlm.uplink[i] = params->ulink[i];
        }

        if (drv_can_neg_ttlm(sdata->local, sdata, &neg_ttlm) !=
            NEG_TTLM_RES_ACCEPT)
                return -EINVAL;

        ieee80211_apply_neg_ttlm(sdata, neg_ttlm);
        sdata->u.mgd.dialog_token_alloc++;
        ieee80211_send_neg_ttlm_req(sdata, &sdata->vif.neg_ttlm,
                                    sdata->u.mgd.dialog_token_alloc);
        wiphy_delayed_work_cancel(sdata->local->hw.wiphy,
                                  &sdata->u.mgd.neg_ttlm_timeout_work);
        wiphy_delayed_work_queue(sdata->local->hw.wiphy,
                                 &sdata->u.mgd.neg_ttlm_timeout_work,
                                 IEEE80211_NEG_TTLM_REQ_TIMEOUT);
        return 0;
}

static void
ieee80211_send_neg_ttlm_res(struct ieee80211_sub_if_data *sdata,
                            enum ieee80211_neg_ttlm_res ttlm_res,
                            u8 dialog_token,
                            struct ieee80211_neg_ttlm *neg_ttlm)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_mgmt *mgmt;
        struct sk_buff *skb;
        int hdr_len = offsetofend(struct ieee80211_mgmt, u.action.u.ttlm_res);
        int ttlm_max_len = 2 + 1 + sizeof(struct ieee80211_ttlm_elem) + 1 +
                2 * 2 * IEEE80211_TTLM_NUM_TIDS;
        u16 status_code;

        skb = dev_alloc_skb(local->tx_headroom + hdr_len + ttlm_max_len);
        if (!skb)
                return;

        skb_reserve(skb, local->tx_headroom);
        mgmt = skb_put_zero(skb, hdr_len);
        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                                          IEEE80211_STYPE_ACTION);
        memcpy(mgmt->da, sdata->vif.cfg.ap_addr, ETH_ALEN);
        memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
        memcpy(mgmt->bssid, sdata->vif.cfg.ap_addr, ETH_ALEN);

        mgmt->u.action.category = WLAN_CATEGORY_PROTECTED_EHT;
        mgmt->u.action.u.ttlm_res.action_code =
                WLAN_PROTECTED_EHT_ACTION_TTLM_RES;
        mgmt->u.action.u.ttlm_res.dialog_token = dialog_token;
        switch (ttlm_res) {
        default:
                WARN_ON(1);
                fallthrough;
        case NEG_TTLM_RES_REJECT:
                status_code = WLAN_STATUS_DENIED_TID_TO_LINK_MAPPING;
                break;
        case NEG_TTLM_RES_ACCEPT:
                status_code = WLAN_STATUS_SUCCESS;
                break;
        case NEG_TTLM_RES_SUGGEST_PREFERRED:
                status_code = WLAN_STATUS_PREF_TID_TO_LINK_MAPPING_SUGGESTED;
                ieee80211_neg_ttlm_add_suggested_map(skb, neg_ttlm);
                break;
        }

        mgmt->u.action.u.ttlm_res.status_code = cpu_to_le16(status_code);
        ieee80211_tx_skb(sdata, skb);
}

static int
ieee80211_parse_neg_ttlm(struct ieee80211_sub_if_data *sdata,
                         const struct ieee80211_ttlm_elem *ttlm,
                         struct ieee80211_neg_ttlm *neg_ttlm,
                         u8 *direction)
{
        u8 control, link_map_presence, map_size, tid;
        u8 *pos;

        /* The element size was already validated in
         * ieee80211_tid_to_link_map_size_ok()
         */
        pos = (void *)ttlm->optional;

        control = ttlm->control;

        /* mapping switch time and expected duration fields are not expected
         * in case of negotiated TTLM
         */
        if (control & (IEEE80211_TTLM_CONTROL_SWITCH_TIME_PRESENT |
                       IEEE80211_TTLM_CONTROL_EXPECTED_DUR_PRESENT)) {
                mlme_dbg(sdata,
                         "Invalid TTLM element in negotiated TTLM request\n");
                return -EINVAL;
        }

        if (control & IEEE80211_TTLM_CONTROL_DEF_LINK_MAP) {
                for (tid = 0; tid < IEEE80211_TTLM_NUM_TIDS; tid++) {
                        neg_ttlm->downlink[tid] = sdata->vif.valid_links;
                        neg_ttlm->uplink[tid] = sdata->vif.valid_links;
                }
                *direction = IEEE80211_TTLM_DIRECTION_BOTH;
                return 0;
        }

        *direction = u8_get_bits(control, IEEE80211_TTLM_CONTROL_DIRECTION);
        if (*direction != IEEE80211_TTLM_DIRECTION_DOWN &&
            *direction != IEEE80211_TTLM_DIRECTION_UP &&
            *direction != IEEE80211_TTLM_DIRECTION_BOTH)
                return -EINVAL;

        link_map_presence = *pos;
        pos++;

        if (control & IEEE80211_TTLM_CONTROL_LINK_MAP_SIZE)
                map_size = 1;
        else
                map_size = 2;

        for (tid = 0; tid < IEEE80211_TTLM_NUM_TIDS; tid++) {
                u16 map;

                if (link_map_presence & BIT(tid)) {
                        map = ieee80211_get_ttlm(map_size, pos);
                        if (!map) {
                                mlme_dbg(sdata,
                                         "No active links for TID %d", tid);
                                return -EINVAL;
                        }
                } else {
                        map = 0;
                }

                switch (*direction) {
                case IEEE80211_TTLM_DIRECTION_BOTH:
                        neg_ttlm->downlink[tid] = map;
                        neg_ttlm->uplink[tid] = map;
                        break;
                case IEEE80211_TTLM_DIRECTION_DOWN:
                        neg_ttlm->downlink[tid] = map;
                        break;
                case IEEE80211_TTLM_DIRECTION_UP:
                        neg_ttlm->uplink[tid] = map;
                        break;
                default:
                        return -EINVAL;
                }
                pos += map_size;
        }
        return 0;
}

void ieee80211_process_neg_ttlm_req(struct ieee80211_sub_if_data *sdata,
                                    struct ieee80211_mgmt *mgmt, size_t len)
{
        u8 dialog_token, direction[IEEE80211_TTLM_MAX_CNT] = {}, i;
        size_t ies_len;
        enum ieee80211_neg_ttlm_res ttlm_res = NEG_TTLM_RES_ACCEPT;
        struct ieee802_11_elems *elems = NULL;
        struct ieee80211_neg_ttlm neg_ttlm = {};

        BUILD_BUG_ON(ARRAY_SIZE(direction) != ARRAY_SIZE(elems->ttlm));

        if (!ieee80211_vif_is_mld(&sdata->vif))
                return;

        dialog_token = mgmt->u.action.u.ttlm_req.dialog_token;
        ies_len  = len - offsetof(struct ieee80211_mgmt,
                                  u.action.u.ttlm_req.variable);
        elems = ieee802_11_parse_elems(mgmt->u.action.u.ttlm_req.variable,
                                       ies_len,
                                       IEEE80211_FTYPE_MGMT |
                                       IEEE80211_STYPE_ACTION,
                                       NULL);
        if (!elems) {
                ttlm_res = NEG_TTLM_RES_REJECT;
                goto out;
        }

        for (i = 0; i < elems->ttlm_num; i++) {
                if (ieee80211_parse_neg_ttlm(sdata, elems->ttlm[i],
                                             &neg_ttlm, &direction[i]) ||
                    (direction[i] == IEEE80211_TTLM_DIRECTION_BOTH &&
                     elems->ttlm_num != 1)) {
                        ttlm_res = NEG_TTLM_RES_REJECT;
                        goto out;
                }
        }

        if (!elems->ttlm_num ||
            (elems->ttlm_num == 2 && direction[0] == direction[1])) {
                ttlm_res = NEG_TTLM_RES_REJECT;
                goto out;
        }

        for (i = 0; i < IEEE80211_TTLM_NUM_TIDS; i++) {
                if ((neg_ttlm.downlink[i] &&
                     (neg_ttlm.downlink[i] & ~sdata->vif.valid_links)) ||
                    (neg_ttlm.uplink[i] &&
                     (neg_ttlm.uplink[i] & ~sdata->vif.valid_links))) {
                        ttlm_res = NEG_TTLM_RES_REJECT;
                        goto out;
                }
        }

        ttlm_res = drv_can_neg_ttlm(sdata->local, sdata, &neg_ttlm);

        if (ttlm_res != NEG_TTLM_RES_ACCEPT)
                goto out;

        ieee80211_apply_neg_ttlm(sdata, neg_ttlm);
out:
        kfree(elems);
        ieee80211_send_neg_ttlm_res(sdata, ttlm_res, dialog_token, &neg_ttlm);
}

void ieee80211_process_neg_ttlm_res(struct ieee80211_sub_if_data *sdata,
                                    struct ieee80211_mgmt *mgmt, size_t len)
{
        if (!ieee80211_vif_is_mld(&sdata->vif) ||
            mgmt->u.action.u.ttlm_req.dialog_token !=
            sdata->u.mgd.dialog_token_alloc)
                return;

        wiphy_delayed_work_cancel(sdata->local->hw.wiphy,
                                  &sdata->u.mgd.neg_ttlm_timeout_work);

        /* MLD station sends a TID to link mapping request, mainly to handle
         * BTM (BSS transition management) request, in which case it needs to
         * restrict the active links set.
         * In this case it's not expected that the MLD AP will reject the
         * negotiated TTLM request.
         * This can be better implemented in the future, to handle request
         * rejections.
         */
        if (le16_to_cpu(mgmt->u.action.u.ttlm_res.status_code) != WLAN_STATUS_SUCCESS)
                __ieee80211_disconnect(sdata);
}

void ieee80211_process_ttlm_teardown(struct ieee80211_sub_if_data *sdata)
{
        u16 new_dormant_links;

        if (!sdata->vif.neg_ttlm.valid)
                return;

        memset(&sdata->vif.neg_ttlm, 0, sizeof(sdata->vif.neg_ttlm));
        new_dormant_links =
                sdata->vif.dormant_links & ~sdata->vif.suspended_links;
        sdata->vif.suspended_links = 0;
        ieee80211_vif_set_links(sdata, sdata->vif.valid_links,
                                new_dormant_links);
        ieee80211_vif_cfg_change_notify(sdata, BSS_CHANGED_MLD_TTLM |
                                               BSS_CHANGED_MLD_VALID_LINKS);
}

static void ieee80211_teardown_ttlm_work(struct wiphy *wiphy,
                                         struct wiphy_work *work)
{
        struct ieee80211_sub_if_data *sdata =
                container_of(work, struct ieee80211_sub_if_data,
                             u.mgd.teardown_ttlm_work);

        ieee80211_process_ttlm_teardown(sdata);
}

void ieee80211_send_teardown_neg_ttlm(struct ieee80211_vif *vif)
{
        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_mgmt *mgmt;
        struct sk_buff *skb;
        int frame_len = offsetofend(struct ieee80211_mgmt,
                                  u.action.u.ttlm_tear_down);
        struct ieee80211_tx_info *info;

        skb = dev_alloc_skb(local->hw.extra_tx_headroom + frame_len);
        if (!skb)
                return;

        skb_reserve(skb, local->hw.extra_tx_headroom);
        mgmt = skb_put_zero(skb, frame_len);
        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                                          IEEE80211_STYPE_ACTION);
        memcpy(mgmt->da, sdata->vif.cfg.ap_addr, ETH_ALEN);
        memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
        memcpy(mgmt->bssid, sdata->vif.cfg.ap_addr, ETH_ALEN);

        mgmt->u.action.category = WLAN_CATEGORY_PROTECTED_EHT;
        mgmt->u.action.u.ttlm_tear_down.action_code =
                WLAN_PROTECTED_EHT_ACTION_TTLM_TEARDOWN;

        info = IEEE80211_SKB_CB(skb);
        info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
        info->status_data = IEEE80211_STATUS_TYPE_NEG_TTLM;
        ieee80211_tx_skb(sdata, skb);
}
EXPORT_SYMBOL(ieee80211_send_teardown_neg_ttlm);

void ieee80211_sta_rx_queued_ext(struct ieee80211_sub_if_data *sdata,
                                 struct sk_buff *skb)
{
        struct ieee80211_link_data *link = &sdata->deflink;
        struct ieee80211_rx_status *rx_status;
        struct ieee80211_hdr *hdr;
        u16 fc;

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        rx_status = (struct ieee80211_rx_status *) skb->cb;
        hdr = (struct ieee80211_hdr *) skb->data;
        fc = le16_to_cpu(hdr->frame_control);

        switch (fc & IEEE80211_FCTL_STYPE) {
        case IEEE80211_STYPE_S1G_BEACON:
                ieee80211_rx_mgmt_beacon(link, hdr, skb->len, rx_status);
                break;
        }
}

void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
                                  struct sk_buff *skb)
{
        struct ieee80211_link_data *link = &sdata->deflink;
        struct ieee80211_rx_status *rx_status;
        struct ieee802_11_elems *elems;
        struct ieee80211_mgmt *mgmt;
        u16 fc;
        int ies_len;

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        rx_status = (struct ieee80211_rx_status *) skb->cb;
        mgmt = (struct ieee80211_mgmt *) skb->data;
        fc = le16_to_cpu(mgmt->frame_control);

        if (rx_status->link_valid) {
                link = sdata_dereference(sdata->link[rx_status->link_id],
                                         sdata);
                if (!link)
                        return;
        }

        switch (fc & IEEE80211_FCTL_STYPE) {
        case IEEE80211_STYPE_BEACON:
                ieee80211_rx_mgmt_beacon(link, (void *)mgmt,
                                         skb->len, rx_status);
                break;
        case IEEE80211_STYPE_PROBE_RESP:
                ieee80211_rx_mgmt_probe_resp(link, skb);
                break;
        case IEEE80211_STYPE_AUTH:
                ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
                break;
        case IEEE80211_STYPE_DEAUTH:
                ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
                break;
        case IEEE80211_STYPE_DISASSOC:
                ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
                break;
        case IEEE80211_STYPE_ASSOC_RESP:
        case IEEE80211_STYPE_REASSOC_RESP:
                ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
                break;
        case IEEE80211_STYPE_ACTION:
                if (!sdata->u.mgd.associated ||
                    !ether_addr_equal(mgmt->bssid, sdata->vif.cfg.ap_addr))
                        break;

                switch (mgmt->u.action.category) {
                case WLAN_CATEGORY_SPECTRUM_MGMT:
                        ies_len = skb->len -
                                  offsetof(struct ieee80211_mgmt,
                                           u.action.u.chan_switch.variable);

                        if (ies_len < 0)
                                break;

                        /* CSA IE cannot be overridden, no need for BSSID */
                        elems = ieee802_11_parse_elems(mgmt->u.action.u.chan_switch.variable,
                                                       ies_len,
                                                       IEEE80211_FTYPE_MGMT |
                                                       IEEE80211_STYPE_ACTION,
                                                       NULL);

                        if (elems && !elems->parse_error) {
                                enum ieee80211_csa_source src =
                                        IEEE80211_CSA_SOURCE_PROT_ACTION;

                                ieee80211_sta_process_chanswitch(link,
                                                                 rx_status->mactime,
                                                                 rx_status->device_timestamp,
                                                                 elems, elems,
                                                                 src);
                        }
                        kfree(elems);
                        break;
                case WLAN_CATEGORY_PUBLIC:
                case WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION:
                        ies_len = skb->len -
                                  offsetof(struct ieee80211_mgmt,
                                           u.action.u.ext_chan_switch.variable);

                        if (ies_len < 0)
                                break;

                        /*
                         * extended CSA IE can't be overridden, no need for
                         * BSSID
                         */
                        elems = ieee802_11_parse_elems(mgmt->u.action.u.ext_chan_switch.variable,
                                                       ies_len,
                                                       IEEE80211_FTYPE_MGMT |
                                                       IEEE80211_STYPE_ACTION,
                                                       NULL);

                        if (elems && !elems->parse_error) {
                                enum ieee80211_csa_source src;

                                if (mgmt->u.action.category ==
                                                WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION)
                                        src = IEEE80211_CSA_SOURCE_PROT_ACTION;
                                else
                                        src = IEEE80211_CSA_SOURCE_UNPROT_ACTION;

                                /* for the handling code pretend it was an IE */
                                elems->ext_chansw_ie =
                                        &mgmt->u.action.u.ext_chan_switch.data;

                                ieee80211_sta_process_chanswitch(link,
                                                                 rx_status->mactime,
                                                                 rx_status->device_timestamp,
                                                                 elems, elems,
                                                                 src);
                        }

                        kfree(elems);
                        break;
                }
                break;
        }
}

static void ieee80211_sta_timer(struct timer_list *t)
{
        struct ieee80211_sub_if_data *sdata =
                timer_container_of(sdata, t, u.mgd.timer);

        wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
}

void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
                                   u8 reason, bool tx)
{
        u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

        ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
                               tx, frame_buf);

        ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
                                    reason, false);
}

static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
        u32 tx_flags = 0;
        u16 trans = 1;
        u16 status = 0;
        struct ieee80211_prep_tx_info info = {
                .subtype = IEEE80211_STYPE_AUTH,
        };

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        if (WARN_ON_ONCE(!auth_data))
                return -EINVAL;

        if (auth_data->algorithm == WLAN_AUTH_EPPKE &&
            ieee80211_vif_is_mld(&sdata->vif) &&
            !cfg80211_find_ext_elem(WLAN_EID_EXT_EHT_MULTI_LINK,
                                    auth_data->data, auth_data->data_len))
                return -EINVAL;

        auth_data->tries++;

        if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
                sdata_info(sdata, "authentication with %pM timed out\n",
                           auth_data->ap_addr);

                /*
                 * Most likely AP is not in the range so remove the
                 * bss struct for that AP.
                 */
                cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);

                return -ETIMEDOUT;
        }

        if (auth_data->algorithm == WLAN_AUTH_SAE)
                info.duration = jiffies_to_msecs(IEEE80211_AUTH_TIMEOUT_SAE);

        info.link_id = auth_data->link_id;
        drv_mgd_prepare_tx(local, sdata, &info);

        sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
                   auth_data->ap_addr, auth_data->tries,
                   IEEE80211_AUTH_MAX_TRIES);

        auth_data->expected_transaction = 2;

        if (auth_data->algorithm == WLAN_AUTH_SAE) {
                trans = auth_data->trans;
                status = auth_data->status;
                auth_data->expected_transaction = trans;
        } else if (auth_data->algorithm == WLAN_AUTH_EPPKE) {
                trans = auth_data->trans;
                status = auth_data->status;
        }

        if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
                tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
                           IEEE80211_TX_INTFL_MLME_CONN_TX;

        ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
                            auth_data->data, auth_data->data_len,
                            auth_data->ap_addr, auth_data->ap_addr,
                            NULL, 0, 0, tx_flags);

        if (tx_flags == 0) {
                if (auth_data->algorithm == WLAN_AUTH_SAE)
                        auth_data->timeout = jiffies +
                                IEEE80211_AUTH_TIMEOUT_SAE;
                else
                        auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
        } else {
                auth_data->timeout =
                        round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
        }

        auth_data->timeout_started = true;
        run_again(sdata, auth_data->timeout);

        return 0;
}

static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
        struct ieee80211_local *local = sdata->local;
        int ret;

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        assoc_data->tries++;
        assoc_data->comeback = false;
        if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
                sdata_info(sdata, "association with %pM timed out\n",
                           assoc_data->ap_addr);

                /*
                 * Most likely AP is not in the range so remove the
                 * bss struct for that AP.
                 */
                cfg80211_unlink_bss(local->hw.wiphy,
                                    assoc_data->link[assoc_data->assoc_link_id].bss);

                return -ETIMEDOUT;
        }

        sdata_info(sdata, "associate with %pM (try %d/%d)\n",
                   assoc_data->ap_addr, assoc_data->tries,
                   IEEE80211_ASSOC_MAX_TRIES);
        ret = ieee80211_send_assoc(sdata);
        if (ret)
                return ret;

        if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
                assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
                assoc_data->timeout_started = true;
                run_again(sdata, assoc_data->timeout);
        } else {
                assoc_data->timeout =
                        round_jiffies_up(jiffies +
                                         IEEE80211_ASSOC_TIMEOUT_LONG);
                assoc_data->timeout_started = true;
                run_again(sdata, assoc_data->timeout);
        }

        return 0;
}

void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
                                  __le16 fc, bool acked)
{
        struct ieee80211_local *local = sdata->local;

        sdata->u.mgd.status_fc = fc;
        sdata->u.mgd.status_acked = acked;
        sdata->u.mgd.status_received = true;

        wiphy_work_queue(local->hw.wiphy, &sdata->work);
}

void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        if (ifmgd->status_received) {
                __le16 fc = ifmgd->status_fc;
                bool status_acked = ifmgd->status_acked;

                ifmgd->status_received = false;
                if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
                        if (status_acked) {
                                if (ifmgd->auth_data->algorithm ==
                                    WLAN_AUTH_SAE)
                                        ifmgd->auth_data->timeout =
                                                jiffies +
                                                IEEE80211_AUTH_TIMEOUT_SAE;
                                else
                                        ifmgd->auth_data->timeout =
                                                jiffies +
                                                IEEE80211_AUTH_TIMEOUT_SHORT;
                                run_again(sdata, ifmgd->auth_data->timeout);
                        } else {
                                ifmgd->auth_data->timeout = jiffies - 1;
                        }
                        ifmgd->auth_data->timeout_started = true;
                } else if (ifmgd->assoc_data &&
                           !ifmgd->assoc_data->comeback &&
                           (ieee80211_is_assoc_req(fc) ||
                            ieee80211_is_reassoc_req(fc))) {
                        /*
                         * Update association timeout based on the TX status
                         * for the (Re)Association Request frame. Skip this if
                         * we have already processed a (Re)Association Response
                         * frame that indicated need for association comeback
                         * at a specific time in the future. This could happen
                         * if the TX status information is delayed enough for
                         * the response to be received and processed first.
                         */
                        if (status_acked) {
                                ifmgd->assoc_data->timeout =
                                        jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
                                run_again(sdata, ifmgd->assoc_data->timeout);
                        } else {
                                ifmgd->assoc_data->timeout = jiffies - 1;
                        }
                        ifmgd->assoc_data->timeout_started = true;
                }
        }

        if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
            time_after(jiffies, ifmgd->auth_data->timeout)) {
                if (ifmgd->auth_data->done || ifmgd->auth_data->waiting) {
                        /*
                         * ok ... we waited for assoc or continuation but
                         * userspace didn't do it, so kill the auth data
                         */
                        ieee80211_destroy_auth_data(sdata, false);
                } else if (ieee80211_auth(sdata)) {
                        u8 ap_addr[ETH_ALEN];
                        struct ieee80211_event event = {
                                .type = MLME_EVENT,
                                .u.mlme.data = AUTH_EVENT,
                                .u.mlme.status = MLME_TIMEOUT,
                        };

                        memcpy(ap_addr, ifmgd->auth_data->ap_addr, ETH_ALEN);

                        ieee80211_destroy_auth_data(sdata, false);

                        cfg80211_auth_timeout(sdata->dev, ap_addr);
                        drv_event_callback(sdata->local, sdata, &event);
                }
        } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
                run_again(sdata, ifmgd->auth_data->timeout);

        if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
            time_after(jiffies, ifmgd->assoc_data->timeout)) {
                if ((ifmgd->assoc_data->need_beacon &&
                     !sdata->deflink.u.mgd.have_beacon) ||
                    ieee80211_do_assoc(sdata)) {
                        struct ieee80211_event event = {
                                .type = MLME_EVENT,
                                .u.mlme.data = ASSOC_EVENT,
                                .u.mlme.status = MLME_TIMEOUT,
                        };

                        ieee80211_destroy_assoc_data(sdata, ASSOC_TIMEOUT);
                        drv_event_callback(sdata->local, sdata, &event);
                }
        } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
                run_again(sdata, ifmgd->assoc_data->timeout);

        if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
            ifmgd->associated) {
                u8 *bssid = sdata->deflink.u.mgd.bssid;
                int max_tries;

                if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
                        max_tries = max_nullfunc_tries;
                else
                        max_tries = max_probe_tries;

                /* ACK received for nullfunc probing frame */
                if (!ifmgd->probe_send_count)
                        ieee80211_reset_ap_probe(sdata);
                else if (ifmgd->nullfunc_failed) {
                        if (ifmgd->probe_send_count < max_tries) {
                                mlme_dbg(sdata,
                                         "No ack for nullfunc frame to AP %pM, try %d/%i\n",
                                         bssid, ifmgd->probe_send_count,
                                         max_tries);
                                ieee80211_mgd_probe_ap_send(sdata);
                        } else {
                                mlme_dbg(sdata,
                                         "No ack for nullfunc frame to AP %pM, disconnecting.\n",
                                         bssid);
                                ieee80211_sta_connection_lost(sdata,
                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
                                        false);
                        }
                } else if (time_is_after_jiffies(ifmgd->probe_timeout))
                        run_again(sdata, ifmgd->probe_timeout);
                else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
                        mlme_dbg(sdata,
                                 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
                                 bssid, probe_wait_ms);
                        ieee80211_sta_connection_lost(sdata,
                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
                } else if (ifmgd->probe_send_count < max_tries) {
                        mlme_dbg(sdata,
                                 "No probe response from AP %pM after %dms, try %d/%i\n",
                                 bssid, probe_wait_ms,
                                 ifmgd->probe_send_count, max_tries);
                        ieee80211_mgd_probe_ap_send(sdata);
                } else {
                        /*
                         * We actually lost the connection ... or did we?
                         * Let's make sure!
                         */
                        mlme_dbg(sdata,
                                 "No probe response from AP %pM after %dms, disconnecting.\n",
                                 bssid, probe_wait_ms);

                        ieee80211_sta_connection_lost(sdata,
                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
                }
        }
}

static bool
ieee80211_is_csa_in_progress(struct ieee80211_sub_if_data *sdata)
{
        /*
         * In MLO, check the CSA flags 'active' and 'waiting_bcn' for all
         * the links.
         */
        struct ieee80211_link_data *link;

        guard(rcu)();

        for_each_link_data_rcu(sdata, link) {
                if (!(link->conf->csa_active &&
                      !link->u.mgd.csa.waiting_bcn))
                        return false;
        }

        return true;
}

static void ieee80211_sta_bcn_mon_timer(struct timer_list *t)
{
        struct ieee80211_sub_if_data *sdata =
                timer_container_of(sdata, t, u.mgd.bcn_mon_timer);

        if (ieee80211_is_csa_in_progress(sdata))
                return;

        if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
                return;

        sdata->u.mgd.connection_loss = false;
        wiphy_work_queue(sdata->local->hw.wiphy,
                         &sdata->u.mgd.beacon_connection_loss_work);
}

static unsigned long
ieee80211_latest_active_link_conn_timeout(struct ieee80211_sub_if_data *sdata)
{
        unsigned long latest_timeout = jiffies;
        unsigned int link_id;
        struct sta_info *sta;

        guard(rcu)();

        sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr);
        if (!sta)
                return 0;

        for (link_id = 0; link_id < ARRAY_SIZE(sta->link);
             link_id++) {
                struct link_sta_info *link_sta;
                unsigned long timeout;

                link_sta = rcu_dereference(sta->link[link_id]);
                if (!link_sta)
                        continue;

                timeout = link_sta->status_stats.last_ack;
                if (time_before(timeout, link_sta->rx_stats.last_rx))
                        timeout = link_sta->rx_stats.last_rx;

                timeout += IEEE80211_CONNECTION_IDLE_TIME;

                /*
                 * latest_timeout holds the timeout of the link
                 * that will expire last among all links in an
                 * non-AP MLD STA. This ensures that the connection
                 * monitor timer is only reset if at least one link
                 * is still active, and it is scheduled to fire at
                 * the latest possible timeout.
                 */
                if (time_after(timeout, latest_timeout))
                        latest_timeout = timeout;
        }

        return latest_timeout;
}

static void ieee80211_sta_conn_mon_timer(struct timer_list *t)
{
        struct ieee80211_sub_if_data *sdata =
                timer_container_of(sdata, t, u.mgd.conn_mon_timer);
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct ieee80211_local *local = sdata->local;
        unsigned long latest_timeout;

        if (ieee80211_is_csa_in_progress(sdata))
                return;

        latest_timeout = ieee80211_latest_active_link_conn_timeout(sdata);

        /*
         * If latest timeout is after now, then update timer to fire at
         * the later date, but do not actually probe at this time.
         */
        if (time_is_after_jiffies(latest_timeout)) {
                mod_timer(&ifmgd->conn_mon_timer,
                          round_jiffies_up(latest_timeout));
                return;
        }

        wiphy_work_queue(local->hw.wiphy, &sdata->u.mgd.monitor_work);
}

static void ieee80211_sta_monitor_work(struct wiphy *wiphy,
                                       struct wiphy_work *work)
{
        struct ieee80211_sub_if_data *sdata =
                container_of(work, struct ieee80211_sub_if_data,
                             u.mgd.monitor_work);

        ieee80211_mgd_probe_ap(sdata, false);
}

static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
        if (sdata->vif.type == NL80211_IFTYPE_STATION) {
                __ieee80211_stop_poll(sdata);

                /* let's probe the connection once */
                if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
                        wiphy_work_queue(sdata->local->hw.wiphy,
                                         &sdata->u.mgd.monitor_work);
        }
}

#ifdef CONFIG_PM
void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        if (ifmgd->auth_data || ifmgd->assoc_data) {
                const u8 *ap_addr = ifmgd->auth_data ?
                                ifmgd->auth_data->ap_addr :
                                ifmgd->assoc_data->ap_addr;

                /*
                 * If we are trying to authenticate / associate while suspending,
                 * cfg80211 won't know and won't actually abort those attempts,
                 * thus we need to do that ourselves.
                 */
                ieee80211_send_deauth_disassoc(sdata, ap_addr, ap_addr,
                                               IEEE80211_STYPE_DEAUTH,
                                               WLAN_REASON_DEAUTH_LEAVING,
                                               false, frame_buf);
                if (ifmgd->assoc_data)
                        ieee80211_destroy_assoc_data(sdata, ASSOC_ABANDON);
                if (ifmgd->auth_data)
                        ieee80211_destroy_auth_data(sdata, false);
                cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
                                      IEEE80211_DEAUTH_FRAME_LEN,
                                      false);
        }

        /* This is a bit of a hack - we should find a better and more generic
         * solution to this. Normally when suspending, cfg80211 will in fact
         * deauthenticate. However, it doesn't (and cannot) stop an ongoing
         * auth (not so important) or assoc (this is the problem) process.
         *
         * As a consequence, it can happen that we are in the process of both
         * associating and suspending, and receive an association response
         * after cfg80211 has checked if it needs to disconnect, but before
         * we actually set the flag to drop incoming frames. This will then
         * cause the workqueue flush to process the association response in
         * the suspend, resulting in a successful association just before it
         * tries to remove the interface from the driver, which now though
         * has a channel context assigned ... this results in issues.
         *
         * To work around this (for now) simply deauth here again if we're
         * now connected.
         */
        if (ifmgd->associated && !sdata->local->wowlan) {
                u8 bssid[ETH_ALEN];
                struct cfg80211_deauth_request req = {
                        .reason_code = WLAN_REASON_DEAUTH_LEAVING,
                        .bssid = bssid,
                };

                memcpy(bssid, sdata->vif.cfg.ap_addr, ETH_ALEN);
                ieee80211_mgd_deauth(sdata, &req);
        }
}
#endif

void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        if (!ifmgd->associated)
                return;

        if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
                sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
                mlme_dbg(sdata, "driver requested disconnect after resume\n");
                ieee80211_sta_connection_lost(sdata,
                                              WLAN_REASON_UNSPECIFIED,
                                              true);
                return;
        }

        if (sdata->flags & IEEE80211_SDATA_DISCONNECT_HW_RESTART) {
                sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_HW_RESTART;
                mlme_dbg(sdata, "driver requested disconnect after hardware restart\n");
                ieee80211_sta_connection_lost(sdata,
                                              WLAN_REASON_UNSPECIFIED,
                                              true);
                return;
        }
}

static void ieee80211_request_smps_mgd_work(struct wiphy *wiphy,
                                            struct wiphy_work *work)
{
        struct ieee80211_link_data *link =
                container_of(work, struct ieee80211_link_data,
                             u.mgd.request_smps_work);

        __ieee80211_request_smps_mgd(link->sdata, link,
                                     link->u.mgd.driver_smps_mode);
}

static void ieee80211_ml_sta_reconf_timeout(struct wiphy *wiphy,
                                            struct wiphy_work *work)
{
        struct ieee80211_sub_if_data *sdata =
                container_of(work, struct ieee80211_sub_if_data,
                             u.mgd.reconf.wk.work);

        if (!sdata->u.mgd.reconf.added_links &&
            !sdata->u.mgd.reconf.removed_links)
                return;

        sdata_info(sdata,
                   "mlo: reconf: timeout: added=0x%x, removed=0x%x\n",
                   sdata->u.mgd.reconf.added_links,
                   sdata->u.mgd.reconf.removed_links);

        __ieee80211_disconnect(sdata);
}

/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

        wiphy_work_init(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
        wiphy_work_init(&ifmgd->beacon_connection_loss_work,
                        ieee80211_beacon_connection_loss_work);
        wiphy_work_init(&ifmgd->csa_connection_drop_work,
                        ieee80211_csa_connection_drop_work);
        wiphy_delayed_work_init(&ifmgd->tdls_peer_del_work,
                                ieee80211_tdls_peer_del_work);
        wiphy_hrtimer_work_init(&ifmgd->ml_reconf_work,
                                ieee80211_ml_reconf_work);
        wiphy_delayed_work_init(&ifmgd->reconf.wk,
                                ieee80211_ml_sta_reconf_timeout);
        timer_setup(&ifmgd->timer, ieee80211_sta_timer, 0);
        timer_setup(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 0);
        timer_setup(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 0);
        wiphy_delayed_work_init(&ifmgd->tx_tspec_wk,
                                ieee80211_sta_handle_tspec_ac_params_wk);
        wiphy_hrtimer_work_init(&ifmgd->ttlm_work,
                                ieee80211_tid_to_link_map_work);
        wiphy_delayed_work_init(&ifmgd->neg_ttlm_timeout_work,
                                ieee80211_neg_ttlm_timeout_work);
        wiphy_work_init(&ifmgd->teardown_ttlm_work,
                        ieee80211_teardown_ttlm_work);

        ifmgd->flags = 0;
        ifmgd->powersave = sdata->wdev.ps;
        ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
        ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
        /* Setup TDLS data */
        spin_lock_init(&ifmgd->teardown_lock);
        ifmgd->teardown_skb = NULL;
        ifmgd->orig_teardown_skb = NULL;
        ifmgd->mcast_seq_last = IEEE80211_SN_MODULO;
}

static void ieee80211_recalc_smps_work(struct wiphy *wiphy,
                                       struct wiphy_work *work)
{
        struct ieee80211_link_data *link =
                container_of(work, struct ieee80211_link_data,
                             u.mgd.recalc_smps);

        ieee80211_recalc_smps(link->sdata, link);
}

void ieee80211_mgd_setup_link(struct ieee80211_link_data *link)
{
        struct ieee80211_sub_if_data *sdata = link->sdata;
        struct ieee80211_local *local = sdata->local;
        unsigned int link_id = link->link_id;

        link->u.mgd.p2p_noa_index = -1;
        link->conf->bssid = link->u.mgd.bssid;
        link->smps_mode = IEEE80211_SMPS_OFF;

        wiphy_work_init(&link->u.mgd.request_smps_work,
                        ieee80211_request_smps_mgd_work);
        wiphy_work_init(&link->u.mgd.recalc_smps,
                        ieee80211_recalc_smps_work);
        if (local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
                link->u.mgd.req_smps = IEEE80211_SMPS_AUTOMATIC;
        else
                link->u.mgd.req_smps = IEEE80211_SMPS_OFF;

        wiphy_hrtimer_work_init(&link->u.mgd.csa.switch_work,
                                ieee80211_csa_switch_work);

        ieee80211_clear_tpe(&link->conf->tpe);

        if (sdata->u.mgd.assoc_data)
                ether_addr_copy(link->conf->addr,
                                sdata->u.mgd.assoc_data->link[link_id].addr);
        else if (sdata->u.mgd.reconf.add_links_data)
                ether_addr_copy(link->conf->addr,
                                sdata->u.mgd.reconf.add_links_data->link[link_id].addr);
        else if (!is_valid_ether_addr(link->conf->addr))
                eth_random_addr(link->conf->addr);
}

/* scan finished notification */
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
{
        struct ieee80211_sub_if_data *sdata;

        /* Restart STA timers */
        rcu_read_lock();
        list_for_each_entry_rcu(sdata, &local->interfaces, list) {
                if (ieee80211_sdata_running(sdata))
                        ieee80211_restart_sta_timer(sdata);
        }
        rcu_read_unlock();
}

static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
                                     struct cfg80211_bss *cbss, s8 link_id,
                                     const u8 *ap_mld_addr, bool assoc,
                                     struct ieee80211_conn_settings *conn,
                                     bool override,
                                     unsigned long *userspace_selectors)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct ieee80211_bss *bss = (void *)cbss->priv;
        struct sta_info *new_sta = NULL;
        struct ieee80211_link_data *link;
        bool have_sta = false;
        bool mlo;
        int err;
        u16 new_links;

        if (link_id >= 0) {
                mlo = true;
                if (WARN_ON(!ap_mld_addr))
                        return -EINVAL;
                new_links = BIT(link_id);
        } else {
                if (WARN_ON(ap_mld_addr))
                        return -EINVAL;
                ap_mld_addr = cbss->bssid;
                new_links = 0;
                link_id = 0;
                mlo = false;
        }

        if (assoc) {
                rcu_read_lock();
                have_sta = sta_info_get(sdata, ap_mld_addr);
                rcu_read_unlock();
        }

        if (mlo && !have_sta &&
            WARN_ON(sdata->vif.valid_links || sdata->vif.active_links))
                return -EINVAL;

        err = ieee80211_vif_set_links(sdata, new_links, 0);
        if (err)
                return err;

        link = sdata_dereference(sdata->link[link_id], sdata);
        if (WARN_ON(!link)) {
                err = -ENOLINK;
                goto out_err;
        }

        if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data)) {
                err = -EINVAL;
                goto out_err;
        }

        /* If a reconfig is happening, bail out */
        if (local->in_reconfig) {
                err = -EBUSY;
                goto out_err;
        }

        if (!have_sta) {
                if (mlo)
                        new_sta = sta_info_alloc_with_link(sdata, ap_mld_addr,
                                                           link_id, cbss->bssid,
                                                           GFP_KERNEL);
                else
                        new_sta = sta_info_alloc(sdata, ap_mld_addr, GFP_KERNEL);

                if (!new_sta) {
                        err = -ENOMEM;
                        goto out_err;
                }

                if (ifmgd->auth_data &&
                    ifmgd->auth_data->algorithm == WLAN_AUTH_EPPKE)
                        new_sta->sta.epp_peer = true;

                new_sta->sta.mlo = mlo;
        }

        /*
         * Set up the information for the new channel before setting the
         * new channel. We can't - completely race-free - change the basic
         * rates bitmap and the channel (sband) that it refers to, but if
         * we set it up before we at least avoid calling into the driver's
         * bss_info_changed() method with invalid information (since we do
         * call that from changing the channel - only for IDLE and perhaps
         * some others, but ...).
         *
         * So to avoid that, just set up all the new information before the
         * channel, but tell the driver to apply it only afterwards, since
         * it might need the new channel for that.
         */
        if (new_sta) {
                const struct cfg80211_bss_ies *ies;
                struct link_sta_info *link_sta;

                rcu_read_lock();
                link_sta = rcu_dereference(new_sta->link[link_id]);
                if (WARN_ON(!link_sta)) {
                        rcu_read_unlock();
                        sta_info_free(local, new_sta);
                        err = -EINVAL;
                        goto out_err;
                }

                err = ieee80211_mgd_setup_link_sta(link, new_sta,
                                                   link_sta, cbss);
                if (err) {
                        rcu_read_unlock();
                        sta_info_free(local, new_sta);
                        goto out_err;
                }

                memcpy(link->u.mgd.bssid, cbss->bssid, ETH_ALEN);

                /* set timing information */
                link->conf->beacon_int = cbss->beacon_interval;
                ies = rcu_dereference(cbss->beacon_ies);
                if (ies) {
                        link->conf->sync_tsf = ies->tsf;
                        link->conf->sync_device_ts =
                                bss->device_ts_beacon;

                        ieee80211_get_dtim(ies,
                                           &link->conf->sync_dtim_count,
                                           NULL);
                } else if (!ieee80211_hw_check(&sdata->local->hw,
                                               TIMING_BEACON_ONLY)) {
                        ies = rcu_dereference(cbss->proberesp_ies);
                        /* must be non-NULL since beacon IEs were NULL */
                        link->conf->sync_tsf = ies->tsf;
                        link->conf->sync_device_ts =
                                bss->device_ts_presp;
                        link->conf->sync_dtim_count = 0;
                } else {
                        link->conf->sync_tsf = 0;
                        link->conf->sync_device_ts = 0;
                        link->conf->sync_dtim_count = 0;
                }
                rcu_read_unlock();
        }

        if (new_sta || override) {
                /*
                 * Only set this if we're also going to calculate the AP
                 * settings etc., otherwise this was set before in a
                 * previous call. Note override is set to %true in assoc
                 * if the settings were changed.
                 */
                link->u.mgd.conn = *conn;
                err = ieee80211_prep_channel(sdata, link, link->link_id, cbss,
                                             mlo, &link->u.mgd.conn,
                                             userspace_selectors);
                if (err) {
                        if (new_sta)
                                sta_info_free(local, new_sta);
                        goto out_err;
                }
                /* pass out for use in assoc */
                *conn = link->u.mgd.conn;
        }

        if (new_sta) {
                /*
                 * tell driver about BSSID, basic rates and timing
                 * this was set up above, before setting the channel
                 */
                ieee80211_link_info_change_notify(sdata, link,
                                                  BSS_CHANGED_BSSID |
                                                  BSS_CHANGED_BASIC_RATES |
                                                  BSS_CHANGED_BEACON_INT);

                if (assoc)
                        sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);

                err = sta_info_insert(new_sta);
                new_sta = NULL;
                if (err) {
                        sdata_info(sdata,
                                   "failed to insert STA entry for the AP (error %d)\n",
                                   err);
                        goto out_release_chan;
                }
        } else
                WARN_ON_ONCE(!ether_addr_equal(link->u.mgd.bssid, cbss->bssid));

        /* Cancel scan to ensure that nothing interferes with connection */
        if (local->scanning)
                ieee80211_scan_cancel(local);

        return 0;

out_release_chan:
        ieee80211_link_release_channel(link);
out_err:
        ieee80211_vif_set_links(sdata, 0, 0);
        return err;
}

static bool ieee80211_mgd_csa_present(struct ieee80211_sub_if_data *sdata,
                                      const struct cfg80211_bss_ies *ies,
                                      u8 cur_channel, bool ignore_ecsa)
{
        const struct element *csa_elem, *ecsa_elem;
        struct ieee80211_channel_sw_ie *csa = NULL;
        struct ieee80211_ext_chansw_ie *ecsa = NULL;

        if (!ies)
                return false;

        csa_elem = cfg80211_find_elem(WLAN_EID_CHANNEL_SWITCH,
                                      ies->data, ies->len);
        if (csa_elem && csa_elem->datalen == sizeof(*csa))
                csa = (void *)csa_elem->data;

        ecsa_elem = cfg80211_find_elem(WLAN_EID_EXT_CHANSWITCH_ANN,
                                       ies->data, ies->len);
        if (ecsa_elem && ecsa_elem->datalen == sizeof(*ecsa))
                ecsa = (void *)ecsa_elem->data;

        if (csa && csa->count == 0)
                csa = NULL;
        if (csa && !csa->mode && csa->new_ch_num == cur_channel)
                csa = NULL;

        if (ecsa && ecsa->count == 0)
                ecsa = NULL;
        if (ecsa && !ecsa->mode && ecsa->new_ch_num == cur_channel)
                ecsa = NULL;

        if (ignore_ecsa && ecsa) {
                sdata_info(sdata,
                           "Ignoring ECSA in probe response - was considered stuck!\n");
                return csa;
        }

        return csa || ecsa;
}

static bool ieee80211_mgd_csa_in_process(struct ieee80211_sub_if_data *sdata,
                                         struct cfg80211_bss *bss)
{
        u8 cur_channel;
        bool ret;

        cur_channel = ieee80211_frequency_to_channel(bss->channel->center_freq);

        rcu_read_lock();
        if (ieee80211_mgd_csa_present(sdata,
                                      rcu_dereference(bss->beacon_ies),
                                      cur_channel, false)) {
                ret = true;
                goto out;
        }

        if (ieee80211_mgd_csa_present(sdata,
                                      rcu_dereference(bss->proberesp_ies),
                                      cur_channel, bss->proberesp_ecsa_stuck)) {
                ret = true;
                goto out;
        }

        ret = false;
out:
        rcu_read_unlock();
        return ret;
}

static void ieee80211_parse_cfg_selectors(unsigned long *userspace_selectors,
                                          const u8 *supported_selectors,
                                          u8 supported_selectors_len)
{
        if (supported_selectors) {
                for (int i = 0; i < supported_selectors_len; i++) {
                        set_bit(supported_selectors[i],
                                userspace_selectors);
                }
        } else {
                /* Assume SAE_H2E support for backward compatibility. */
                set_bit(BSS_MEMBERSHIP_SELECTOR_SAE_H2E,
                        userspace_selectors);
        }
}

/* config hooks */
int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
                       struct cfg80211_auth_request *req)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct ieee80211_mgd_auth_data *auth_data;
        struct ieee80211_conn_settings conn;
        struct ieee80211_link_data *link;
        struct ieee80211_supported_band *sband;
        struct ieee80211_bss *bss;
        u16 auth_alg;
        int err;
        bool cont_auth, wmm_used;

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        /* prepare auth data structure */

        switch (req->auth_type) {
        case NL80211_AUTHTYPE_OPEN_SYSTEM:
                auth_alg = WLAN_AUTH_OPEN;
                break;
        case NL80211_AUTHTYPE_SHARED_KEY:
                if (fips_enabled)
                        return -EOPNOTSUPP;
                auth_alg = WLAN_AUTH_SHARED_KEY;
                break;
        case NL80211_AUTHTYPE_FT:
                auth_alg = WLAN_AUTH_FT;
                break;
        case NL80211_AUTHTYPE_NETWORK_EAP:
                auth_alg = WLAN_AUTH_LEAP;
                break;
        case NL80211_AUTHTYPE_SAE:
                auth_alg = WLAN_AUTH_SAE;
                break;
        case NL80211_AUTHTYPE_FILS_SK:
                auth_alg = WLAN_AUTH_FILS_SK;
                break;
        case NL80211_AUTHTYPE_FILS_SK_PFS:
                auth_alg = WLAN_AUTH_FILS_SK_PFS;
                break;
        case NL80211_AUTHTYPE_FILS_PK:
                auth_alg = WLAN_AUTH_FILS_PK;
                break;
        case NL80211_AUTHTYPE_EPPKE:
                auth_alg = WLAN_AUTH_EPPKE;
                break;
        default:
                return -EOPNOTSUPP;
        }

        if (ifmgd->assoc_data)
                return -EBUSY;

        if (ieee80211_mgd_csa_in_process(sdata, req->bss)) {
                sdata_info(sdata, "AP is in CSA process, reject auth\n");
                return -EINVAL;
        }

        auth_data = kzalloc(sizeof(*auth_data) + req->auth_data_len +
                            req->ie_len, GFP_KERNEL);
        if (!auth_data)
                return -ENOMEM;

        memcpy(auth_data->ap_addr,
               req->ap_mld_addr ?: req->bss->bssid,
               ETH_ALEN);
        auth_data->bss = req->bss;
        auth_data->link_id = req->link_id;

        if (req->auth_data_len >= 4) {
                if (req->auth_type == NL80211_AUTHTYPE_SAE ||
                    req->auth_type == NL80211_AUTHTYPE_EPPKE) {
                        __le16 *pos = (__le16 *) req->auth_data;

                        auth_data->trans = le16_to_cpu(pos[0]);
                        auth_data->status = le16_to_cpu(pos[1]);
                }

                memcpy(auth_data->data, req->auth_data + 4,
                       req->auth_data_len - 4);
                auth_data->data_len += req->auth_data_len - 4;
        }

        /* Check if continuing authentication or trying to authenticate with the
         * same BSS that we were in the process of authenticating with and avoid
         * removal and re-addition of the STA entry in
         * ieee80211_prep_connection().
         */
        cont_auth = ifmgd->auth_data && req->bss == ifmgd->auth_data->bss &&
                    ifmgd->auth_data->link_id == req->link_id;

        if (req->ie && req->ie_len) {
                memcpy(&auth_data->data[auth_data->data_len],
                       req->ie, req->ie_len);
                auth_data->data_len += req->ie_len;
        }

        if (req->key && req->key_len) {
                auth_data->key_len = req->key_len;
                auth_data->key_idx = req->key_idx;
                memcpy(auth_data->key, req->key, req->key_len);
        }

        ieee80211_parse_cfg_selectors(auth_data->userspace_selectors,
                                      req->supported_selectors,
                                      req->supported_selectors_len);

        auth_data->algorithm = auth_alg;

        /* try to authenticate/probe */

        if (ifmgd->auth_data) {
                if (cont_auth && req->auth_type == NL80211_AUTHTYPE_SAE) {
                        auth_data->peer_confirmed =
                                ifmgd->auth_data->peer_confirmed;
                }
                ieee80211_destroy_auth_data(sdata, cont_auth);
        }

        /* prep auth_data so we don't go into idle on disassoc */
        ifmgd->auth_data = auth_data;

        /* If this is continuation of an ongoing SAE authentication exchange
         * (i.e., request to send SAE Confirm) and the peer has already
         * confirmed, mark authentication completed since we are about to send
         * out SAE Confirm.
         */
        if (cont_auth && req->auth_type == NL80211_AUTHTYPE_SAE &&
            auth_data->peer_confirmed && auth_data->trans == 2)
                ieee80211_mark_sta_auth(sdata);

        if (cont_auth && req->auth_type == NL80211_AUTHTYPE_EPPKE &&
            auth_data->trans == 3)
                ieee80211_mark_sta_auth(sdata);

        if (ifmgd->associated) {
                u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

                sdata_info(sdata,
                           "disconnect from AP %pM for new auth to %pM\n",
                           sdata->vif.cfg.ap_addr, auth_data->ap_addr);
                ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
                                       WLAN_REASON_UNSPECIFIED,
                                       false, frame_buf);

                ieee80211_report_disconnect(sdata, frame_buf,
                                            sizeof(frame_buf), true,
                                            WLAN_REASON_UNSPECIFIED,
                                            false);
        }

        /* needed for transmitting the auth frame(s) properly */
        memcpy(sdata->vif.cfg.ap_addr, auth_data->ap_addr, ETH_ALEN);

        bss = (void *)req->bss->priv;
        wmm_used = bss->wmm_used && (local->hw.queues >= IEEE80211_NUM_ACS);

        sband = local->hw.wiphy->bands[req->bss->channel->band];

        ieee80211_determine_our_sta_mode_auth(sdata, sband, req, wmm_used,
                                              &conn);

        err = ieee80211_prep_connection(sdata, req->bss, req->link_id,
                                        req->ap_mld_addr, cont_auth,
                                        &conn, false,
                                        auth_data->userspace_selectors);
        if (err)
                goto err_clear;

        if (req->link_id >= 0)
                link = sdata_dereference(sdata->link[req->link_id], sdata);
        else
                link = &sdata->deflink;

        if (WARN_ON(!link)) {
                err = -ENOLINK;
                goto err_clear;
        }

        sdata_info(sdata, "authenticate with %pM (local address=%pM)\n",
                   auth_data->ap_addr, link->conf->addr);

        err = ieee80211_auth(sdata);
        if (err) {
                sta_info_destroy_addr(sdata, auth_data->ap_addr);
                goto err_clear;
        }

        /* hold our own reference */
        cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
        return 0;

 err_clear:
        if (!ieee80211_vif_is_mld(&sdata->vif)) {
                eth_zero_addr(sdata->deflink.u.mgd.bssid);
                ieee80211_link_info_change_notify(sdata, &sdata->deflink,
                                                  BSS_CHANGED_BSSID);
                ieee80211_link_release_channel(&sdata->deflink);
        }
        ifmgd->auth_data = NULL;
        kfree(auth_data);
        return err;
}

static void
ieee80211_setup_assoc_link(struct ieee80211_sub_if_data *sdata,
                           struct ieee80211_mgd_assoc_data *assoc_data,
                           struct cfg80211_assoc_request *req,
                           struct ieee80211_conn_settings *conn,
                           unsigned int link_id)
{
        struct ieee80211_local *local = sdata->local;
        const struct cfg80211_bss_ies *bss_ies;
        struct ieee80211_supported_band *sband;
        struct ieee80211_link_data *link;
        struct cfg80211_bss *cbss;
        struct ieee80211_bss *bss;

        cbss = assoc_data->link[link_id].bss;
        if (WARN_ON(!cbss))
                return;

        bss = (void *)cbss->priv;

        sband = local->hw.wiphy->bands[cbss->channel->band];
        if (WARN_ON(!sband))
                return;

        link = sdata_dereference(sdata->link[link_id], sdata);
        if (WARN_ON(!link))
                return;

        /* for MLO connections assume advertising all rates is OK */
        if (!req->ap_mld_addr) {
                assoc_data->supp_rates = bss->supp_rates;
                assoc_data->supp_rates_len = bss->supp_rates_len;
        }

        /* copy and link elems for the STA profile */
        if (req->links[link_id].elems_len) {
                memcpy(assoc_data->ie_pos, req->links[link_id].elems,
                       req->links[link_id].elems_len);
                assoc_data->link[link_id].elems = assoc_data->ie_pos;
                assoc_data->link[link_id].elems_len = req->links[link_id].elems_len;
                assoc_data->ie_pos += req->links[link_id].elems_len;
        }

        link->u.mgd.beacon_crc_valid = false;
        link->u.mgd.dtim_period = 0;
        link->u.mgd.have_beacon = false;

        /* override HT configuration only if the AP and we support it */
        if (conn->mode >= IEEE80211_CONN_MODE_HT) {
                struct ieee80211_sta_ht_cap sta_ht_cap;

                memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
                ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
        }

        rcu_read_lock();
        bss_ies = rcu_dereference(cbss->beacon_ies);
        if (bss_ies) {
                u8 dtim_count = 0;

                ieee80211_get_dtim(bss_ies, &dtim_count,
                                   &link->u.mgd.dtim_period);

                sdata->deflink.u.mgd.have_beacon = true;

                if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
                        link->conf->sync_tsf = bss_ies->tsf;
                        link->conf->sync_device_ts = bss->device_ts_beacon;
                        link->conf->sync_dtim_count = dtim_count;
                }
        } else {
                bss_ies = rcu_dereference(cbss->ies);
        }

        if (bss_ies) {
                const struct element *elem;

                elem = cfg80211_find_ext_elem(WLAN_EID_EXT_MULTIPLE_BSSID_CONFIGURATION,
                                              bss_ies->data, bss_ies->len);
                if (elem && elem->datalen >= 3)
                        link->conf->profile_periodicity = elem->data[2];
                else
                        link->conf->profile_periodicity = 0;

                elem = cfg80211_find_elem(WLAN_EID_EXT_CAPABILITY,
                                          bss_ies->data, bss_ies->len);
                if (elem && elem->datalen >= 11 &&
                    (elem->data[10] & WLAN_EXT_CAPA11_EMA_SUPPORT))
                        link->conf->ema_ap = true;
                else
                        link->conf->ema_ap = false;
        }
        rcu_read_unlock();

        if (bss->corrupt_data) {
                char *corrupt_type = "data";

                if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
                        if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
                                corrupt_type = "beacon and probe response";
                        else
                                corrupt_type = "beacon";
                } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP) {
                        corrupt_type = "probe response";
                }
                sdata_info(sdata, "associating to AP %pM with corrupt %s\n",
                           cbss->bssid, corrupt_type);
        }

        if (link->u.mgd.req_smps == IEEE80211_SMPS_AUTOMATIC) {
                if (sdata->u.mgd.powersave)
                        link->smps_mode = IEEE80211_SMPS_DYNAMIC;
                else
                        link->smps_mode = IEEE80211_SMPS_OFF;
        } else {
                link->smps_mode = link->u.mgd.req_smps;
        }
}

static int
ieee80211_mgd_get_ap_ht_vht_capa(struct ieee80211_sub_if_data *sdata,
                                 struct ieee80211_mgd_assoc_data *assoc_data,
                                 int link_id)
{
        struct cfg80211_bss *cbss = assoc_data->link[link_id].bss;
        enum nl80211_band band = cbss->channel->band;
        struct ieee80211_supported_band *sband;
        const struct element *elem;
        int err;

        /* neither HT nor VHT elements used on 6 GHz */
        if (band == NL80211_BAND_6GHZ)
                return 0;

        if (assoc_data->link[link_id].conn.mode < IEEE80211_CONN_MODE_HT)
                return 0;

        rcu_read_lock();
        elem = ieee80211_bss_get_elem(cbss, WLAN_EID_HT_OPERATION);
        if (!elem || elem->datalen < sizeof(struct ieee80211_ht_operation)) {
                mlme_link_id_dbg(sdata, link_id, "no HT operation on BSS %pM\n",
                                 cbss->bssid);
                err = -EINVAL;
                goto out_rcu;
        }
        assoc_data->link[link_id].ap_ht_param =
                ((struct ieee80211_ht_operation *)(elem->data))->ht_param;
        rcu_read_unlock();

        if (assoc_data->link[link_id].conn.mode < IEEE80211_CONN_MODE_VHT)
                return 0;

        /* some drivers want to support VHT on 2.4 GHz even */
        sband = sdata->local->hw.wiphy->bands[band];
        if (!sband->vht_cap.vht_supported)
                return 0;

        rcu_read_lock();
        elem = ieee80211_bss_get_elem(cbss, WLAN_EID_VHT_CAPABILITY);
        /* but even then accept it not being present on the AP */
        if (!elem && band == NL80211_BAND_2GHZ) {
                err = 0;
                goto out_rcu;
        }
        if (!elem || elem->datalen < sizeof(struct ieee80211_vht_cap)) {
                mlme_link_id_dbg(sdata, link_id, "no VHT capa on BSS %pM\n",
                                 cbss->bssid);
                err = -EINVAL;
                goto out_rcu;
        }
        memcpy(&assoc_data->link[link_id].ap_vht_cap, elem->data,
               sizeof(struct ieee80211_vht_cap));
        rcu_read_unlock();

        return 0;
out_rcu:
        rcu_read_unlock();
        return err;
}

static bool
ieee80211_mgd_assoc_bss_has_mld_ext_capa_ops(struct cfg80211_assoc_request *req)
{
        const struct cfg80211_bss_ies *ies;
        struct cfg80211_bss *bss;
        const struct element *ml;

        /* not an MLO connection if link_id < 0, so irrelevant */
        if (req->link_id < 0)
                return false;

        bss = req->links[req->link_id].bss;

        guard(rcu)();
        ies = rcu_dereference(bss->ies);
        for_each_element_extid(ml, WLAN_EID_EXT_EHT_MULTI_LINK,
                               ies->data, ies->len) {
                const struct ieee80211_multi_link_elem *mle;

                if (!ieee80211_mle_type_ok(ml->data + 1,
                                           IEEE80211_ML_CONTROL_TYPE_BASIC,
                                           ml->datalen - 1))
                        continue;

                mle = (void *)(ml->data + 1);
                if (mle->control & cpu_to_le16(IEEE80211_MLC_BASIC_PRES_EXT_MLD_CAPA_OP))
                        return true;
        }

        return false;

}

int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
                        struct cfg80211_assoc_request *req)
{
        unsigned int assoc_link_id = req->link_id < 0 ? 0 : req->link_id;
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct ieee80211_mgd_assoc_data *assoc_data;
        const struct element *ssid_elem;
        struct ieee80211_vif_cfg *vif_cfg = &sdata->vif.cfg;
        struct ieee80211_link_data *link;
        struct cfg80211_bss *cbss;
        bool override, uapsd_supported;
        bool match_auth;
        int i, err;
        size_t size = sizeof(*assoc_data) + req->ie_len;

        for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++)
                size += req->links[i].elems_len;

        /* FIXME: no support for 4-addr MLO yet */
        if (sdata->u.mgd.use_4addr && req->link_id >= 0)
                return -EOPNOTSUPP;

        assoc_data = kzalloc(size, GFP_KERNEL);
        if (!assoc_data)
                return -ENOMEM;

        cbss = req->link_id < 0 ? req->bss : req->links[req->link_id].bss;

        if (ieee80211_mgd_csa_in_process(sdata, cbss)) {
                sdata_info(sdata, "AP is in CSA process, reject assoc\n");
                err = -EINVAL;
                goto err_free;
        }

        rcu_read_lock();
        ssid_elem = ieee80211_bss_get_elem(cbss, WLAN_EID_SSID);
        if (!ssid_elem || ssid_elem->datalen > sizeof(assoc_data->ssid)) {
                rcu_read_unlock();
                err = -EINVAL;
                goto err_free;
        }

        memcpy(assoc_data->ssid, ssid_elem->data, ssid_elem->datalen);
        assoc_data->ssid_len = ssid_elem->datalen;
        rcu_read_unlock();

        if (req->ap_mld_addr)
                memcpy(assoc_data->ap_addr, req->ap_mld_addr, ETH_ALEN);
        else
                memcpy(assoc_data->ap_addr, cbss->bssid, ETH_ALEN);

        /*
         * Many APs have broken parsing of the extended MLD capa/ops field,
         * dropping (re-)association request frames or replying with association
         * response with a failure status if it's present.
         * Set our value from the userspace request only in strict mode or if
         * the AP also had that field present.
         */
        if (ieee80211_hw_check(&local->hw, STRICT) ||
            ieee80211_mgd_assoc_bss_has_mld_ext_capa_ops(req))
                assoc_data->ext_mld_capa_ops =
                        cpu_to_le16(req->ext_mld_capa_ops);

        if (ifmgd->associated) {
                u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

                sdata_info(sdata,
                           "disconnect from AP %pM for new assoc to %pM\n",
                           sdata->vif.cfg.ap_addr, assoc_data->ap_addr);
                ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
                                       WLAN_REASON_UNSPECIFIED,
                                       false, frame_buf);

                ieee80211_report_disconnect(sdata, frame_buf,
                                            sizeof(frame_buf), true,
                                            WLAN_REASON_UNSPECIFIED,
                                            false);
        }

        memset(sdata->u.mgd.userspace_selectors, 0,
               sizeof(sdata->u.mgd.userspace_selectors));
        ieee80211_parse_cfg_selectors(sdata->u.mgd.userspace_selectors,
                                      req->supported_selectors,
                                      req->supported_selectors_len);

        memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
        memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
               sizeof(ifmgd->ht_capa_mask));

        memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
        memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
               sizeof(ifmgd->vht_capa_mask));

        memcpy(&ifmgd->s1g_capa, &req->s1g_capa, sizeof(ifmgd->s1g_capa));
        memcpy(&ifmgd->s1g_capa_mask, &req->s1g_capa_mask,
               sizeof(ifmgd->s1g_capa_mask));

        /* keep some setup (AP STA, channel, ...) if matching */
        match_auth = ifmgd->auth_data &&
                     ether_addr_equal(ifmgd->auth_data->ap_addr,
                                      assoc_data->ap_addr) &&
                     ifmgd->auth_data->link_id == req->link_id;

        if (req->ap_mld_addr) {
                uapsd_supported = true;

                if (req->flags & (ASSOC_REQ_DISABLE_HT |
                                  ASSOC_REQ_DISABLE_VHT |
                                  ASSOC_REQ_DISABLE_HE |
                                  ASSOC_REQ_DISABLE_EHT)) {
                        err = -EINVAL;
                        goto err_free;
                }

                for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++) {
                        struct ieee80211_supported_band *sband;
                        struct cfg80211_bss *link_cbss = req->links[i].bss;
                        struct ieee80211_bss *bss;

                        if (!link_cbss)
                                continue;

                        bss = (void *)link_cbss->priv;

                        if (!bss->wmm_used) {
                                err = -EINVAL;
                                req->links[i].error = err;
                                goto err_free;
                        }

                        if (link_cbss->channel->band == NL80211_BAND_S1GHZ) {
                                err = -EINVAL;
                                req->links[i].error = err;
                                goto err_free;
                        }

                        link = sdata_dereference(sdata->link[i], sdata);
                        if (link)
                                ether_addr_copy(assoc_data->link[i].addr,
                                                link->conf->addr);
                        else
                                eth_random_addr(assoc_data->link[i].addr);
                        sband = local->hw.wiphy->bands[link_cbss->channel->band];

                        if (match_auth && i == assoc_link_id && link)
                                assoc_data->link[i].conn = link->u.mgd.conn;
                        else
                                assoc_data->link[i].conn =
                                        ieee80211_conn_settings_unlimited;
                        ieee80211_determine_our_sta_mode_assoc(sdata, sband,
                                                               req, true, i,
                                                               &assoc_data->link[i].conn);
                        assoc_data->link[i].bss = link_cbss;

                        if (!bss->uapsd_supported)
                                uapsd_supported = false;

                        if (assoc_data->link[i].conn.mode < IEEE80211_CONN_MODE_EHT) {
                                err = -EINVAL;
                                req->links[i].error = err;
                                goto err_free;
                        }

                        err = ieee80211_mgd_get_ap_ht_vht_capa(sdata,
                                                               assoc_data, i);
                        if (err) {
                                err = -EINVAL;
                                req->links[i].error = err;
                                goto err_free;
                        }
                }

                assoc_data->wmm = true;
        } else {
                struct ieee80211_supported_band *sband;
                struct ieee80211_bss *bss = (void *)cbss->priv;

                memcpy(assoc_data->link[0].addr, sdata->vif.addr, ETH_ALEN);
                assoc_data->s1g = cbss->channel->band == NL80211_BAND_S1GHZ;

                assoc_data->wmm = bss->wmm_used &&
                                  (local->hw.queues >= IEEE80211_NUM_ACS);

                if (cbss->channel->band == NL80211_BAND_6GHZ &&
                    req->flags & (ASSOC_REQ_DISABLE_HT |
                                  ASSOC_REQ_DISABLE_VHT |
                                  ASSOC_REQ_DISABLE_HE)) {
                        err = -EINVAL;
                        goto err_free;
                }

                sband = local->hw.wiphy->bands[cbss->channel->band];

                assoc_data->link[0].bss = cbss;

                if (match_auth)
                        assoc_data->link[0].conn = sdata->deflink.u.mgd.conn;
                else
                        assoc_data->link[0].conn =
                                ieee80211_conn_settings_unlimited;
                ieee80211_determine_our_sta_mode_assoc(sdata, sband, req,
                                                       assoc_data->wmm, 0,
                                                       &assoc_data->link[0].conn);

                uapsd_supported = bss->uapsd_supported;

                err = ieee80211_mgd_get_ap_ht_vht_capa(sdata, assoc_data, 0);
                if (err)
                        goto err_free;
        }

        assoc_data->spp_amsdu = req->flags & ASSOC_REQ_SPP_AMSDU;

        if (ifmgd->auth_data && !ifmgd->auth_data->done) {
                err = -EBUSY;
                goto err_free;
        }

        if (ifmgd->assoc_data) {
                err = -EBUSY;
                goto err_free;
        }

        /* Cleanup is delayed if auth_data matches */
        if (ifmgd->auth_data && !match_auth)
                ieee80211_destroy_auth_data(sdata, false);

        if (req->ie && req->ie_len) {
                memcpy(assoc_data->ie, req->ie, req->ie_len);
                assoc_data->ie_len = req->ie_len;
                assoc_data->ie_pos = assoc_data->ie + assoc_data->ie_len;
        } else {
                assoc_data->ie_pos = assoc_data->ie;
        }

        if (req->fils_kek) {
                /* should already be checked in cfg80211 - so warn */
                if (WARN_ON(req->fils_kek_len > FILS_MAX_KEK_LEN)) {
                        err = -EINVAL;
                        goto err_free;
                }
                memcpy(assoc_data->fils_kek, req->fils_kek,
                       req->fils_kek_len);
                assoc_data->fils_kek_len = req->fils_kek_len;
        }

        if (req->fils_nonces)
                memcpy(assoc_data->fils_nonces, req->fils_nonces,
                       2 * FILS_NONCE_LEN);

        /* default timeout */
        assoc_data->timeout = jiffies;
        assoc_data->timeout_started = true;

        assoc_data->assoc_link_id = assoc_link_id;

        if (req->ap_mld_addr) {
                /* if there was no authentication, set up the link */
                err = ieee80211_vif_set_links(sdata, BIT(assoc_link_id), 0);
                if (err)
                        goto err_clear;
        }

        link = sdata_dereference(sdata->link[assoc_link_id], sdata);
        if (WARN_ON(!link)) {
                err = -EINVAL;
                goto err_clear;
        }

        override = link->u.mgd.conn.mode !=
                        assoc_data->link[assoc_link_id].conn.mode ||
                   link->u.mgd.conn.bw_limit !=
                        assoc_data->link[assoc_link_id].conn.bw_limit;
        link->u.mgd.conn = assoc_data->link[assoc_link_id].conn;

        ieee80211_setup_assoc_link(sdata, assoc_data, req, &link->u.mgd.conn,
                                   assoc_link_id);

        if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
                 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
             "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
                sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;

        if (assoc_data->wmm && uapsd_supported &&
            (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
                assoc_data->uapsd = true;
                ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
        } else {
                assoc_data->uapsd = false;
                ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
        }

        if (req->prev_bssid)
                memcpy(assoc_data->prev_ap_addr, req->prev_bssid, ETH_ALEN);

        if (req->use_mfp) {
                ifmgd->mfp = IEEE80211_MFP_REQUIRED;
                ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
        } else {
                ifmgd->mfp = IEEE80211_MFP_DISABLED;
                ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
        }

        if (req->flags & ASSOC_REQ_USE_RRM)
                ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
        else
                ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;

        if (req->crypto.control_port)
                ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
        else
                ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;

        sdata->control_port_protocol = req->crypto.control_port_ethertype;
        sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
        sdata->control_port_over_nl80211 =
                                        req->crypto.control_port_over_nl80211;
        sdata->control_port_no_preauth = req->crypto.control_port_no_preauth;

        /* kick off associate process */
        ifmgd->assoc_data = assoc_data;

        for (i = 0; i < ARRAY_SIZE(assoc_data->link); i++) {
                if (!assoc_data->link[i].bss)
                        continue;
                if (i == assoc_data->assoc_link_id)
                        continue;
                /* only calculate the mode, hence link == NULL */
                err = ieee80211_prep_channel(sdata, NULL, i,
                                             assoc_data->link[i].bss, true,
                                             &assoc_data->link[i].conn,
                                             sdata->u.mgd.userspace_selectors);
                if (err) {
                        req->links[i].error = err;
                        goto err_clear;
                }
        }

        memcpy(vif_cfg->ssid, assoc_data->ssid, assoc_data->ssid_len);
        vif_cfg->ssid_len = assoc_data->ssid_len;

        /* needed for transmitting the assoc frames properly */
        memcpy(sdata->vif.cfg.ap_addr, assoc_data->ap_addr, ETH_ALEN);

        err = ieee80211_prep_connection(sdata, cbss, req->link_id,
                                        req->ap_mld_addr, true,
                                        &assoc_data->link[assoc_link_id].conn,
                                        override,
                                        sdata->u.mgd.userspace_selectors);
        if (err)
                goto err_clear;

        if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC)) {
                const struct cfg80211_bss_ies *beacon_ies;

                rcu_read_lock();
                beacon_ies = rcu_dereference(req->bss->beacon_ies);
                if (!beacon_ies) {
                        /*
                         * Wait up to one beacon interval ...
                         * should this be more if we miss one?
                         */
                        sdata_info(sdata, "waiting for beacon from %pM\n",
                                   link->u.mgd.bssid);
                        assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
                        assoc_data->timeout_started = true;
                        assoc_data->need_beacon = true;
                }
                rcu_read_unlock();
        }

        run_again(sdata, assoc_data->timeout);

        /* We are associating, clean up auth_data */
        if (ifmgd->auth_data)
                ieee80211_destroy_auth_data(sdata, true);

        return 0;
 err_clear:
        if (!ifmgd->auth_data) {
                eth_zero_addr(sdata->deflink.u.mgd.bssid);
                ieee80211_link_info_change_notify(sdata, &sdata->deflink,
                                                  BSS_CHANGED_BSSID);
        }
        ifmgd->assoc_data = NULL;
 err_free:
        kfree(assoc_data);
        return err;
}

int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
                         struct cfg80211_deauth_request *req)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
        bool tx = !req->local_state_change;
        struct ieee80211_prep_tx_info info = {
                .subtype = IEEE80211_STYPE_DEAUTH,
        };

        if (ifmgd->auth_data &&
            ether_addr_equal(ifmgd->auth_data->ap_addr, req->bssid)) {
                sdata_info(sdata,
                           "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
                           req->bssid, req->reason_code,
                           ieee80211_get_reason_code_string(req->reason_code));

                info.link_id = ifmgd->auth_data->link_id;
                drv_mgd_prepare_tx(sdata->local, sdata, &info);
                ieee80211_send_deauth_disassoc(sdata, req->bssid, req->bssid,
                                               IEEE80211_STYPE_DEAUTH,
                                               req->reason_code, tx,
                                               frame_buf);
                ieee80211_destroy_auth_data(sdata, false);
                ieee80211_report_disconnect(sdata, frame_buf,
                                            sizeof(frame_buf), true,
                                            req->reason_code, false);
                drv_mgd_complete_tx(sdata->local, sdata, &info);
                return 0;
        }

        if (ifmgd->assoc_data &&
            ether_addr_equal(ifmgd->assoc_data->ap_addr, req->bssid)) {
                sdata_info(sdata,
                           "aborting association with %pM by local choice (Reason: %u=%s)\n",
                           req->bssid, req->reason_code,
                           ieee80211_get_reason_code_string(req->reason_code));

                info.link_id = ifmgd->assoc_data->assoc_link_id;
                drv_mgd_prepare_tx(sdata->local, sdata, &info);
                ieee80211_send_deauth_disassoc(sdata, req->bssid, req->bssid,
                                               IEEE80211_STYPE_DEAUTH,
                                               req->reason_code, tx,
                                               frame_buf);
                ieee80211_destroy_assoc_data(sdata, ASSOC_ABANDON);
                ieee80211_report_disconnect(sdata, frame_buf,
                                            sizeof(frame_buf), true,
                                            req->reason_code, false);
                drv_mgd_complete_tx(sdata->local, sdata, &info);
                return 0;
        }

        if (ifmgd->associated &&
            ether_addr_equal(sdata->vif.cfg.ap_addr, req->bssid)) {
                sdata_info(sdata,
                           "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
                           req->bssid, req->reason_code,
                           ieee80211_get_reason_code_string(req->reason_code));

                ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
                                       req->reason_code, tx, frame_buf);
                ieee80211_report_disconnect(sdata, frame_buf,
                                            sizeof(frame_buf), true,
                                            req->reason_code, false);
                return 0;
        }

        return -ENOTCONN;
}

int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
                           struct cfg80211_disassoc_request *req)
{
        u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

        if (!sdata->u.mgd.associated ||
            memcmp(sdata->vif.cfg.ap_addr, req->ap_addr, ETH_ALEN))
                return -ENOTCONN;

        sdata_info(sdata,
                   "disassociating from %pM by local choice (Reason: %u=%s)\n",
                   req->ap_addr, req->reason_code,
                   ieee80211_get_reason_code_string(req->reason_code));

        ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
                               req->reason_code, !req->local_state_change,
                               frame_buf);

        ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
                                    req->reason_code, false);

        return 0;
}

void ieee80211_mgd_stop_link(struct ieee80211_link_data *link)
{
        wiphy_work_cancel(link->sdata->local->hw.wiphy,
                          &link->u.mgd.request_smps_work);
        wiphy_work_cancel(link->sdata->local->hw.wiphy,
                          &link->u.mgd.recalc_smps);
        wiphy_hrtimer_work_cancel(link->sdata->local->hw.wiphy,
                                  &link->u.mgd.csa.switch_work);
}

void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

        /*
         * Make sure some work items will not run after this,
         * they will not do anything but might not have been
         * cancelled when disconnecting.
         */
        wiphy_work_cancel(sdata->local->hw.wiphy,
                          &ifmgd->monitor_work);
        wiphy_work_cancel(sdata->local->hw.wiphy,
                          &ifmgd->beacon_connection_loss_work);
        wiphy_work_cancel(sdata->local->hw.wiphy,
                          &ifmgd->csa_connection_drop_work);
        wiphy_delayed_work_cancel(sdata->local->hw.wiphy,
                                  &ifmgd->tdls_peer_del_work);

        if (ifmgd->assoc_data)
                ieee80211_destroy_assoc_data(sdata, ASSOC_TIMEOUT);
        if (ifmgd->auth_data)
                ieee80211_destroy_auth_data(sdata, false);
        spin_lock_bh(&ifmgd->teardown_lock);
        if (ifmgd->teardown_skb) {
                kfree_skb(ifmgd->teardown_skb);
                ifmgd->teardown_skb = NULL;
                ifmgd->orig_teardown_skb = NULL;
        }
        kfree(ifmgd->assoc_req_ies);
        ifmgd->assoc_req_ies = NULL;
        ifmgd->assoc_req_ies_len = 0;
        spin_unlock_bh(&ifmgd->teardown_lock);
        timer_delete_sync(&ifmgd->timer);
}

void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
                               enum nl80211_cqm_rssi_threshold_event rssi_event,
                               s32 rssi_level,
                               gfp_t gfp)
{
        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

        trace_api_cqm_rssi_notify(sdata, rssi_event, rssi_level);

        cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, rssi_level, gfp);
}
EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);

void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
{
        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

        trace_api_cqm_beacon_loss_notify(sdata->local, sdata);

        cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
}
EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);

static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
                                            int rssi_min_thold,
                                            int rssi_max_thold)
{
        trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);

        if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
                return;

        /*
         * Scale up threshold values before storing it, as the RSSI averaging
         * algorithm uses a scaled up value as well. Change this scaling
         * factor if the RSSI averaging algorithm changes.
         */
        sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
        sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
}

void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
                                    int rssi_min_thold,
                                    int rssi_max_thold)
{
        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

        WARN_ON(rssi_min_thold == rssi_max_thold ||
                rssi_min_thold > rssi_max_thold);

        _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
                                       rssi_max_thold);
}
EXPORT_SYMBOL(ieee80211_enable_rssi_reports);

void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
{
        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

        _ieee80211_enable_rssi_reports(sdata, 0, 0);
}
EXPORT_SYMBOL(ieee80211_disable_rssi_reports);

void ieee80211_process_ml_reconf_resp(struct ieee80211_sub_if_data *sdata,
                                      struct ieee80211_mgmt *mgmt, size_t len)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct ieee80211_mgd_assoc_data *add_links_data =
                ifmgd->reconf.add_links_data;
        struct sta_info *sta;
        struct cfg80211_mlo_reconf_done_data done_data = {};
        u16 sta_changed_links = sdata->u.mgd.reconf.added_links |
                                sdata->u.mgd.reconf.removed_links;
        u16 link_mask, valid_links;
        unsigned int link_id;
        size_t orig_len = len;
        u8 i, group_key_data_len;
        u8 *pos;

        if (!ieee80211_vif_is_mld(&sdata->vif) ||
            len < offsetofend(typeof(*mgmt), u.action.u.ml_reconf_resp) ||
            mgmt->u.action.u.ml_reconf_resp.dialog_token !=
            sdata->u.mgd.reconf.dialog_token ||
            !sta_changed_links)
                return;

        pos = mgmt->u.action.u.ml_reconf_resp.variable;
        len -= offsetofend(typeof(*mgmt), u.action.u.ml_reconf_resp);

        /* each status duple is 3 octets */
        if (len < mgmt->u.action.u.ml_reconf_resp.count * 3) {
                sdata_info(sdata,
                           "mlo: reconf: unexpected len=%zu, count=%u\n",
                           len, mgmt->u.action.u.ml_reconf_resp.count);
                goto disconnect;
        }

        link_mask = sta_changed_links;
        for (i = 0; i < mgmt->u.action.u.ml_reconf_resp.count; i++) {
                u16 status = get_unaligned_le16(pos + 1);

                link_id = *pos;

                if (!(link_mask & BIT(link_id))) {
                        sdata_info(sdata,
                                   "mlo: reconf: unexpected link: %u, changed=0x%x\n",
                                   link_id, sta_changed_links);
                        goto disconnect;
                }

                /* clear the corresponding link, to detect the case that
                 * the same link was included more than one time
                 */
                link_mask &= ~BIT(link_id);

                /* Handle failure to remove links here. Failure to remove added
                 * links will be done later in the flow.
                 */
                if (status != WLAN_STATUS_SUCCESS) {
                        sdata_info(sdata,
                                   "mlo: reconf: failed on link=%u, status=%u\n",
                                   link_id, status);

                        /* The AP MLD failed to remove a link that was already
                         * removed locally. As this is not expected behavior,
                         * disconnect
                         */
                        if (sdata->u.mgd.reconf.removed_links & BIT(link_id))
                                goto disconnect;

                        /* The AP MLD failed to add a link. Remove it from the
                         * added links.
                         */
                        sdata->u.mgd.reconf.added_links &= ~BIT(link_id);
                }

                pos += 3;
                len -= 3;
        }

        if (link_mask) {
                sdata_info(sdata,
                           "mlo: reconf: no response for links=0x%x\n",
                           link_mask);
                goto disconnect;
        }

        if (!sdata->u.mgd.reconf.added_links)
                goto out;

        if (len < 1 || len < 1 + *pos) {
                sdata_info(sdata,
                           "mlo: reconf: invalid group key data length");
                goto disconnect;
        }

        /* The Group Key Data field must be present when links are added. This
         * field should be processed by userland.
         */
        group_key_data_len = *pos++;

        pos += group_key_data_len;
        len -= group_key_data_len + 1;

        /* Process the information for the added links */
        sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr);
        if (WARN_ON(!sta))
                goto disconnect;

        valid_links = sdata->vif.valid_links;
        for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
                if (!add_links_data->link[link_id].bss ||
                    !(sdata->u.mgd.reconf.added_links & BIT(link_id)))
                        continue;

                valid_links |= BIT(link_id);
                if (ieee80211_sta_allocate_link(sta, link_id))
                        goto disconnect;
        }

        ieee80211_vif_set_links(sdata, valid_links, sdata->vif.dormant_links);
        link_mask = 0;
        for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
                struct cfg80211_bss *cbss = add_links_data->link[link_id].bss;
                struct ieee80211_link_data *link;
                struct link_sta_info *link_sta;
                u64 changed = 0;

                if (!cbss)
                        continue;

                link = sdata_dereference(sdata->link[link_id], sdata);
                if (WARN_ON(!link))
                        goto disconnect;

                link_info(link,
                          "mlo: reconf: local address %pM, AP link address %pM\n",
                          add_links_data->link[link_id].addr,
                          add_links_data->link[link_id].bss->bssid);

                link_sta = rcu_dereference_protected(sta->link[link_id],
                                                     lockdep_is_held(&local->hw.wiphy->mtx));
                if (WARN_ON(!link_sta))
                        goto disconnect;

                if (!link->u.mgd.have_beacon) {
                        const struct cfg80211_bss_ies *ies;

                        rcu_read_lock();
                        ies = rcu_dereference(cbss->beacon_ies);
                        if (ies)
                                link->u.mgd.have_beacon = true;
                        else
                                ies = rcu_dereference(cbss->ies);
                        ieee80211_get_dtim(ies,
                                           &link->conf->sync_dtim_count,
                                           &link->u.mgd.dtim_period);
                        link->conf->beacon_int = cbss->beacon_interval;
                        rcu_read_unlock();
                }

                link->conf->dtim_period = link->u.mgd.dtim_period ?: 1;

                link->u.mgd.conn = add_links_data->link[link_id].conn;
                if (ieee80211_prep_channel(sdata, link, link_id, cbss,
                                           true, &link->u.mgd.conn,
                                           sdata->u.mgd.userspace_selectors)) {
                        link_info(link, "mlo: reconf: prep_channel failed\n");
                        goto disconnect;
                }

                if (ieee80211_mgd_setup_link_sta(link, sta, link_sta,
                                                 add_links_data->link[link_id].bss))
                        goto disconnect;

                if (!ieee80211_assoc_config_link(link, link_sta,
                                                 add_links_data->link[link_id].bss,
                                                 mgmt, pos, len,
                                                 &changed))
                        goto disconnect;

                /* The AP MLD indicated success for this link, but the station
                 * profile status indicated otherwise. Since there is an
                 * inconsistency in the ML reconfiguration response, disconnect
                 */
                if (add_links_data->link[link_id].status != WLAN_STATUS_SUCCESS)
                        goto disconnect;

                ieee80211_sta_init_nss(link_sta);
                if (ieee80211_sta_activate_link(sta, link_id))
                        goto disconnect;

                changed |= ieee80211_link_set_associated(link, cbss);
                ieee80211_link_info_change_notify(sdata, link, changed);

                ieee80211_recalc_smps(sdata, link);
                link_mask |= BIT(link_id);
        }

        sdata_info(sdata,
                   "mlo: reconf: current valid_links=0x%x, added=0x%x\n",
                   valid_links, link_mask);

        /* links might have changed due to rejected ones, set them again */
        ieee80211_vif_set_links(sdata, valid_links, sdata->vif.dormant_links);
        ieee80211_vif_cfg_change_notify(sdata, BSS_CHANGED_MLD_VALID_LINKS);

        ieee80211_recalc_ps(local);
        ieee80211_recalc_ps_vif(sdata);

        done_data.buf = (const u8 *)mgmt;
        done_data.len = orig_len;
        done_data.added_links = link_mask;

        for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
                done_data.links[link_id].bss = add_links_data->link[link_id].bss;
                done_data.links[link_id].addr =
                        add_links_data->link[link_id].addr;
        }

        cfg80211_mlo_reconf_add_done(sdata->dev, &done_data);
        kfree(sdata->u.mgd.reconf.add_links_data);
        sdata->u.mgd.reconf.add_links_data = NULL;
out:
        ieee80211_ml_reconf_reset(sdata);
        return;

disconnect:
        __ieee80211_disconnect(sdata);
}

static struct sk_buff *
ieee80211_build_ml_reconf_req(struct ieee80211_sub_if_data *sdata,
                              struct ieee80211_mgd_assoc_data *add_links_data,
                              u16 removed_links, __le16 ext_mld_capa_ops)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_mgmt *mgmt;
        struct ieee80211_multi_link_elem *ml_elem;
        struct ieee80211_mle_basic_common_info *common;
        enum nl80211_iftype iftype = ieee80211_vif_type_p2p(&sdata->vif);
        struct sk_buff *skb;
        size_t size;
        unsigned int link_id;
        __le16 eml_capa = 0, mld_capa_ops = 0;
        struct ieee80211_tx_info *info;
        u8 common_size, var_common_size;
        u8 *ml_elem_len;
        u16 capab = 0;

        size = local->hw.extra_tx_headroom + sizeof(*mgmt);

        /* Consider the maximal length of the reconfiguration ML element */
        size += sizeof(struct ieee80211_multi_link_elem);

        /* The Basic ML element and the Reconfiguration ML element have the same
         * fixed common information fields in the context of ML reconfiguration
         * action frame. The AP MLD MAC address must always be present
         */
        common_size = sizeof(*common);

        /* when adding links, the MLD capabilities must be present */
        var_common_size = 0;
        if (add_links_data) {
                const struct wiphy_iftype_ext_capab *ift_ext_capa =
                        cfg80211_get_iftype_ext_capa(local->hw.wiphy,
                                                     ieee80211_vif_type_p2p(&sdata->vif));

                if (ift_ext_capa) {
                        eml_capa = cpu_to_le16(ift_ext_capa->eml_capabilities);
                        mld_capa_ops =
                                cpu_to_le16(ift_ext_capa->mld_capa_and_ops);
                }

                /* MLD capabilities and operation */
                var_common_size += 2;

                /* EML capabilities */
                if (eml_capa & cpu_to_le16((IEEE80211_EML_CAP_EMLSR_SUPP |
                                            IEEE80211_EML_CAP_EMLMR_SUPPORT)))
                        var_common_size += 2;
        }

        if (ext_mld_capa_ops)
                var_common_size += 2;

        /* Add the common information length */
        size += common_size + var_common_size;

        for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
                struct cfg80211_bss *cbss;
                size_t elems_len;

                if (removed_links & BIT(link_id)) {
                        size += sizeof(struct ieee80211_mle_per_sta_profile) +
                                ETH_ALEN;
                        continue;
                }

                if (!add_links_data || !add_links_data->link[link_id].bss)
                        continue;

                elems_len = add_links_data->link[link_id].elems_len;
                cbss = add_links_data->link[link_id].bss;

                /* should be the same across all BSSes */
                if (cbss->capability & WLAN_CAPABILITY_PRIVACY)
                        capab |= WLAN_CAPABILITY_PRIVACY;

                size += 2 + sizeof(struct ieee80211_mle_per_sta_profile) +
                        ETH_ALEN;

                /* WMM */
                size += 9;
                size += ieee80211_link_common_elems_size(sdata, iftype, cbss,
                                                         elems_len);
        }

        skb = alloc_skb(size, GFP_KERNEL);
        if (!skb)
                return NULL;

        skb_reserve(skb, local->hw.extra_tx_headroom);
        mgmt = skb_put_zero(skb, offsetofend(struct ieee80211_mgmt,
                                             u.action.u.ml_reconf_req));

        /* Add the MAC header */
        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                                          IEEE80211_STYPE_ACTION);
        memcpy(mgmt->da, sdata->vif.cfg.ap_addr, ETH_ALEN);
        memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
        memcpy(mgmt->bssid, sdata->vif.cfg.ap_addr, ETH_ALEN);

        /* Add the action frame fixed fields */
        mgmt->u.action.category = WLAN_CATEGORY_PROTECTED_EHT;
        mgmt->u.action.u.ml_reconf_req.action_code =
                WLAN_PROTECTED_EHT_ACTION_LINK_RECONFIG_REQ;

        /* allocate a dialog token and store it */
        sdata->u.mgd.reconf.dialog_token = ++sdata->u.mgd.dialog_token_alloc;
        mgmt->u.action.u.ml_reconf_req.dialog_token =
                sdata->u.mgd.reconf.dialog_token;

        /* Add the ML reconfiguration element and the common information  */
        skb_put_u8(skb, WLAN_EID_EXTENSION);
        ml_elem_len = skb_put(skb, 1);
        skb_put_u8(skb, WLAN_EID_EXT_EHT_MULTI_LINK);
        ml_elem = skb_put(skb, sizeof(*ml_elem));
        ml_elem->control =
                cpu_to_le16(IEEE80211_ML_CONTROL_TYPE_RECONF |
                            IEEE80211_MLC_RECONF_PRES_MLD_MAC_ADDR);
        common = skb_put(skb, common_size);
        common->len = common_size + var_common_size;
        memcpy(common->mld_mac_addr, sdata->vif.addr, ETH_ALEN);

        if (add_links_data) {
                if (eml_capa &
                    cpu_to_le16((IEEE80211_EML_CAP_EMLSR_SUPP |
                                 IEEE80211_EML_CAP_EMLMR_SUPPORT))) {
                        ml_elem->control |=
                                cpu_to_le16(IEEE80211_MLC_RECONF_PRES_EML_CAPA);
                        skb_put_data(skb, &eml_capa, sizeof(eml_capa));
                }

                ml_elem->control |=
                        cpu_to_le16(IEEE80211_MLC_RECONF_PRES_MLD_CAPA_OP);

                skb_put_data(skb, &mld_capa_ops, sizeof(mld_capa_ops));
        }

        if (ext_mld_capa_ops) {
                ml_elem->control |=
                        cpu_to_le16(IEEE80211_MLC_RECONF_PRES_EXT_MLD_CAPA_OP);
                skb_put_data(skb, &ext_mld_capa_ops, sizeof(ext_mld_capa_ops));
        }

        if (sdata->u.mgd.flags & IEEE80211_STA_ENABLE_RRM)
                capab |= WLAN_CAPABILITY_RADIO_MEASURE;

        /* Add the per station profile */
        for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
                u8 *subelem_len = NULL;
                u16 ctrl;
                const u8 *addr;

                /* Skip links that are not changing */
                if (!(removed_links & BIT(link_id)) &&
                    (!add_links_data || !add_links_data->link[link_id].bss))
                        continue;

                ctrl = link_id |
                       IEEE80211_MLE_STA_RECONF_CONTROL_STA_MAC_ADDR_PRESENT;

                if (removed_links & BIT(link_id)) {
                        struct ieee80211_bss_conf *conf =
                                sdata_dereference(sdata->vif.link_conf[link_id],
                                                  sdata);
                        if (!conf)
                                continue;

                        addr = conf->addr;
                        ctrl |= u16_encode_bits(IEEE80211_MLE_STA_RECONF_CONTROL_OPERATION_TYPE_DEL_LINK,
                                                IEEE80211_MLE_STA_RECONF_CONTROL_OPERATION_TYPE);
                } else {
                        addr = add_links_data->link[link_id].addr;
                        ctrl |= IEEE80211_MLE_STA_RECONF_CONTROL_COMPLETE_PROFILE |
                                u16_encode_bits(IEEE80211_MLE_STA_RECONF_CONTROL_OPERATION_TYPE_ADD_LINK,
                                                IEEE80211_MLE_STA_RECONF_CONTROL_OPERATION_TYPE);
                }

                skb_put_u8(skb, IEEE80211_MLE_SUBELEM_PER_STA_PROFILE);
                subelem_len = skb_put(skb, 1);

                put_unaligned_le16(ctrl, skb_put(skb, sizeof(ctrl)));
                skb_put_u8(skb, 1 + ETH_ALEN);
                skb_put_data(skb, addr, ETH_ALEN);

                if (!(removed_links & BIT(link_id))) {
                        u16 link_present_elems[PRESENT_ELEMS_MAX] = {};
                        size_t extra_used;
                        void *capab_pos;
                        u8 qos_info;

                        capab_pos = skb_put(skb, 2);

                        extra_used =
                                ieee80211_add_link_elems(sdata, skb, &capab, NULL,
                                                         add_links_data->link[link_id].elems,
                                                         add_links_data->link[link_id].elems_len,
                                                         link_id, NULL,
                                                         link_present_elems,
                                                         add_links_data);

                        if (add_links_data->link[link_id].elems)
                                skb_put_data(skb,
                                             add_links_data->link[link_id].elems +
                                             extra_used,
                                             add_links_data->link[link_id].elems_len -
                                             extra_used);
                        if (sdata->u.mgd.flags & IEEE80211_STA_UAPSD_ENABLED) {
                                qos_info = sdata->u.mgd.uapsd_queues;
                                qos_info |= (sdata->u.mgd.uapsd_max_sp_len <<
                                             IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
                        } else {
                                qos_info = 0;
                        }

                        ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
                        put_unaligned_le16(capab, capab_pos);
                }

                ieee80211_fragment_element(skb, subelem_len,
                                           IEEE80211_MLE_SUBELEM_FRAGMENT);
        }

        ieee80211_fragment_element(skb, ml_elem_len, WLAN_EID_FRAGMENT);

        info = IEEE80211_SKB_CB(skb);
        info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;

        return skb;
}

int ieee80211_mgd_assoc_ml_reconf(struct ieee80211_sub_if_data *sdata,
                                  struct cfg80211_ml_reconf_req *req)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_mgd_assoc_data *data = NULL;
        struct sta_info *sta;
        struct sk_buff *skb;
        u16 added_links, new_valid_links;
        int link_id, err;

        if (!ieee80211_vif_is_mld(&sdata->vif) ||
            !(sdata->vif.cfg.mld_capa_op &
              IEEE80211_MLD_CAP_OP_LINK_RECONF_SUPPORT))
                return -EINVAL;

        /* No support for concurrent ML reconfiguration operation */
        if (sdata->u.mgd.reconf.added_links ||
            sdata->u.mgd.reconf.removed_links)
                return -EBUSY;

        added_links = 0;
        for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
                if (!req->add_links[link_id].bss)
                        continue;

                added_links |= BIT(link_id);
        }

        sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr);
        if (WARN_ON(!sta))
                return -ENOLINK;

        /* Adding links to the set of valid link is done only after a successful
         * ML reconfiguration frame exchange. Here prepare the data for the ML
         * reconfiguration frame construction and allocate the required
         * resources
         */
        if (added_links) {
                bool uapsd_supported;

                data = kzalloc_obj(*data);
                if (!data)
                        return -ENOMEM;

                data->assoc_link_id = -1;
                data->wmm = true;

                uapsd_supported = true;
                for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS;
                     link_id++) {
                        struct ieee80211_supported_band *sband;
                        struct cfg80211_bss *link_cbss =
                                req->add_links[link_id].bss;
                        struct ieee80211_bss *bss;

                        if (!link_cbss)
                                continue;

                        bss = (void *)link_cbss->priv;

                        if (!bss->wmm_used) {
                                err = -EINVAL;
                                goto err_free;
                        }

                        if (link_cbss->channel->band == NL80211_BAND_S1GHZ) {
                                err = -EINVAL;
                                goto err_free;
                        }

                        eth_random_addr(data->link[link_id].addr);
                        data->link[link_id].conn =
                                ieee80211_conn_settings_unlimited;
                        sband =
                                local->hw.wiphy->bands[link_cbss->channel->band];

                        ieee80211_determine_our_sta_mode(sdata, sband,
                                                         NULL, true, link_id,
                                                         &data->link[link_id].conn);

                        data->link[link_id].bss = link_cbss;
                        data->link[link_id].elems =
                                (u8 *)req->add_links[link_id].elems;
                        data->link[link_id].elems_len =
                                req->add_links[link_id].elems_len;

                        if (!bss->uapsd_supported)
                                uapsd_supported = false;

                        if (data->link[link_id].conn.mode <
                            IEEE80211_CONN_MODE_EHT) {
                                err = -EINVAL;
                                goto err_free;
                        }

                        err = ieee80211_mgd_get_ap_ht_vht_capa(sdata, data,
                                                               link_id);
                        if (err) {
                                err = -EINVAL;
                                goto err_free;
                        }
                }

                /* Require U-APSD support if we enabled it */
                if (sdata->u.mgd.flags & IEEE80211_STA_UAPSD_ENABLED &&
                    !uapsd_supported) {
                        err = -EINVAL;
                        sdata_info(sdata, "U-APSD on but not available on (all) new links\n");
                        goto err_free;
                }

                for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS;
                     link_id++) {
                        if (!data->link[link_id].bss)
                                continue;

                        /* only used to verify the mode, nothing is allocated */
                        err = ieee80211_prep_channel(sdata, NULL, link_id,
                                                     data->link[link_id].bss,
                                                     true,
                                                     &data->link[link_id].conn,
                                                     sdata->u.mgd.userspace_selectors);
                        if (err)
                                goto err_free;
                }
        }

        /* link removal is done before the ML reconfiguration frame exchange so
         * that these links will not be used between their removal by the AP MLD
         * and before the station got the ML reconfiguration response. Based on
         * Section 35.3.6.4 in Draft P802.11be_D7.0 the AP MLD should accept the
         * link removal request.
         */
        if (req->rem_links) {
                u16 new_active_links =
                        sdata->vif.active_links & ~req->rem_links;

                new_valid_links = sdata->vif.valid_links & ~req->rem_links;

                /* Should not be left with no valid links to perform the
                 * ML reconfiguration
                 */
                if (!new_valid_links ||
                    !(new_valid_links & ~sdata->vif.dormant_links)) {
                        sdata_info(sdata, "mlo: reconf: no valid links\n");
                        err = -EINVAL;
                        goto err_free;
                }

                if (new_active_links != sdata->vif.active_links) {
                        if (!new_active_links)
                                new_active_links =
                                        BIT(__ffs(new_valid_links &
                                                  ~sdata->vif.dormant_links));

                        err = ieee80211_set_active_links(&sdata->vif,
                                                         new_active_links);
                        if (err) {
                                sdata_info(sdata,
                                           "mlo: reconf: failed set active links\n");
                                goto err_free;
                        }
                }
        }

        /* Build the SKB before the link removal as the construction of the
         * station info for removed links requires the local address.
         * Invalidate the removed links, so that the transmission of the ML
         * reconfiguration request frame would not be done using them, as the AP
         * is expected to send the ML reconfiguration response frame on the link
         * on which the request was received.
         */
        skb = ieee80211_build_ml_reconf_req(sdata, data, req->rem_links,
                                            cpu_to_le16(req->ext_mld_capa_ops));
        if (!skb) {
                err = -ENOMEM;
                goto err_free;
        }

        if (req->rem_links) {
                u16 new_dormant_links =
                        sdata->vif.dormant_links & ~req->rem_links;

                err = ieee80211_vif_set_links(sdata, new_valid_links,
                                              new_dormant_links);
                if (err) {
                        sdata_info(sdata,
                                   "mlo: reconf: failed set valid links\n");
                        kfree_skb(skb);
                        goto err_free;
                }

                for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS;
                     link_id++) {
                        if (!(req->rem_links & BIT(link_id)))
                                continue;

                        ieee80211_sta_remove_link(sta, link_id);
                }

                /* notify the driver and upper layers */
                ieee80211_vif_cfg_change_notify(sdata,
                                                BSS_CHANGED_MLD_VALID_LINKS);
                cfg80211_links_removed(sdata->dev, req->rem_links);
        }

        sdata_info(sdata, "mlo: reconf: adding=0x%x, removed=0x%x\n",
                   added_links, req->rem_links);

        ieee80211_tx_skb(sdata, skb);

        sdata->u.mgd.reconf.added_links = added_links;
        sdata->u.mgd.reconf.add_links_data = data;
        sdata->u.mgd.reconf.removed_links = req->rem_links;
        wiphy_delayed_work_queue(sdata->local->hw.wiphy,
                                 &sdata->u.mgd.reconf.wk,
                                 IEEE80211_ASSOC_TIMEOUT_SHORT);
        return 0;

 err_free:
        kfree(data);
        return err;
}

static bool ieee80211_mgd_epcs_supp(struct ieee80211_sub_if_data *sdata)
{
        unsigned long valid_links = sdata->vif.valid_links;
        u8 link_id;

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        if (!ieee80211_vif_is_mld(&sdata->vif))
                return false;

        for_each_set_bit(link_id, &valid_links, IEEE80211_MLD_MAX_NUM_LINKS) {
                struct ieee80211_bss_conf *bss_conf =
                        sdata_dereference(sdata->vif.link_conf[link_id], sdata);

                if (WARN_ON(!bss_conf) || !bss_conf->epcs_support)
                        return false;
        }

        return true;
}

int ieee80211_mgd_set_epcs(struct ieee80211_sub_if_data *sdata, bool enable)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_mgmt *mgmt;
        struct sk_buff *skb;
        int frame_len = offsetofend(struct ieee80211_mgmt,
                                    u.action.u.epcs) + (enable ? 1 : 0);

        if (!ieee80211_mgd_epcs_supp(sdata))
                return -EINVAL;

        if (sdata->u.mgd.epcs.enabled == enable &&
            !sdata->u.mgd.epcs.dialog_token)
                return 0;

        /* Do not allow enabling EPCS if the AP didn't respond yet.
         * However, allow disabling EPCS in such a case.
         */
        if (sdata->u.mgd.epcs.dialog_token && enable)
                return -EALREADY;

        skb = dev_alloc_skb(local->hw.extra_tx_headroom + frame_len);
        if (!skb)
                return -ENOBUFS;

        skb_reserve(skb, local->hw.extra_tx_headroom);
        mgmt = skb_put_zero(skb, frame_len);
        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                                          IEEE80211_STYPE_ACTION);
        memcpy(mgmt->da, sdata->vif.cfg.ap_addr, ETH_ALEN);
        memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
        memcpy(mgmt->bssid, sdata->vif.cfg.ap_addr, ETH_ALEN);

        mgmt->u.action.category = WLAN_CATEGORY_PROTECTED_EHT;
        if (enable) {
                u8 *pos = mgmt->u.action.u.epcs.variable;

                mgmt->u.action.u.epcs.action_code =
                        WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_REQ;

                *pos = ++sdata->u.mgd.dialog_token_alloc;
                sdata->u.mgd.epcs.dialog_token = *pos;
        } else {
                mgmt->u.action.u.epcs.action_code =
                        WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_TEARDOWN;

                ieee80211_epcs_teardown(sdata);
                ieee80211_epcs_changed(sdata, false);
        }

        ieee80211_tx_skb(sdata, skb);
        return 0;
}

static void ieee80211_ml_epcs(struct ieee80211_sub_if_data *sdata,
                              struct ieee802_11_elems *elems)
{
        const struct element *sub;
        size_t scratch_len = elems->ml_epcs_len;
        u8 *scratch __free(kfree) = kzalloc(scratch_len, GFP_KERNEL);

        lockdep_assert_wiphy(sdata->local->hw.wiphy);

        if (!ieee80211_vif_is_mld(&sdata->vif) || !elems->ml_epcs)
                return;

        if (WARN_ON(!scratch))
                return;

        /* Directly parse the sub elements as the common information doesn't
         * hold any useful information.
         */
        for_each_mle_subelement(sub, (const u8 *)elems->ml_epcs,
                                elems->ml_epcs_len) {
                struct ieee802_11_elems *link_elems __free(kfree) = NULL;
                struct ieee80211_link_data *link;
                u8 *pos = (void *)sub->data;
                u16 control;
                ssize_t len;
                u8 link_id;

                if (sub->id != IEEE80211_MLE_SUBELEM_PER_STA_PROFILE)
                        continue;

                if (sub->datalen < sizeof(control))
                        break;

                control = get_unaligned_le16(pos);
                link_id = control & IEEE80211_MLE_STA_EPCS_CONTROL_LINK_ID;

                link = sdata_dereference(sdata->link[link_id], sdata);
                if (!link)
                        continue;

                len = cfg80211_defragment_element(sub, (u8 *)elems->ml_epcs,
                                                  elems->ml_epcs_len,
                                                  scratch, scratch_len,
                                                  IEEE80211_MLE_SUBELEM_FRAGMENT);
                if (len < (ssize_t)sizeof(control))
                        continue;

                pos = scratch + sizeof(control);
                len -= sizeof(control);

                link_elems = ieee802_11_parse_elems(pos, len,
                                                    IEEE80211_FTYPE_MGMT |
                                                    IEEE80211_STYPE_ACTION,
                                                    NULL);
                if (!link_elems)
                        continue;

                if (ieee80211_sta_wmm_params(sdata->local, link,
                                             link_elems->wmm_param,
                                             link_elems->wmm_param_len,
                                             link_elems->mu_edca_param_set))
                        ieee80211_link_info_change_notify(sdata, link,
                                                          BSS_CHANGED_QOS);
        }
}

void ieee80211_process_epcs_ena_resp(struct ieee80211_sub_if_data *sdata,
                                     struct ieee80211_mgmt *mgmt, size_t len)
{
        struct ieee802_11_elems *elems __free(kfree) = NULL;
        size_t ies_len;
        u16 status_code;
        u8 *pos, dialog_token;

        if (!ieee80211_mgd_epcs_supp(sdata))
                return;

        /* Handle dialog token and status code */
        pos = mgmt->u.action.u.epcs.variable;
        dialog_token = *pos;
        status_code = get_unaligned_le16(pos + 1);

        /* An EPCS enable response with dialog token == 0 is an unsolicited
         * notification from the AP MLD. In such a case, EPCS should already be
         * enabled and status must be success
         */
        if (!dialog_token &&
            (!sdata->u.mgd.epcs.enabled ||
             status_code != WLAN_STATUS_SUCCESS))
                return;

        if (sdata->u.mgd.epcs.dialog_token != dialog_token)
                return;

        sdata->u.mgd.epcs.dialog_token = 0;

        if (status_code != WLAN_STATUS_SUCCESS)
                return;

        pos += IEEE80211_EPCS_ENA_RESP_BODY_LEN;
        ies_len = len - offsetof(struct ieee80211_mgmt,
                                 u.action.u.epcs.variable) -
                IEEE80211_EPCS_ENA_RESP_BODY_LEN;

        elems = ieee802_11_parse_elems(pos, ies_len,
                                       IEEE80211_FTYPE_MGMT |
                                       IEEE80211_STYPE_ACTION,
                                       NULL);
        if (!elems)
                return;

        ieee80211_ml_epcs(sdata, elems);
        ieee80211_epcs_changed(sdata, true);
}

void ieee80211_process_epcs_teardown(struct ieee80211_sub_if_data *sdata,
                                     struct ieee80211_mgmt *mgmt, size_t len)
{
        if (!ieee80211_vif_is_mld(&sdata->vif) ||
            !sdata->u.mgd.epcs.enabled)
                return;

        ieee80211_epcs_teardown(sdata);
        ieee80211_epcs_changed(sdata, false);
}