// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
 * Copyright (C) 2024-2025 Intel Corporation
 */
#include <net/cfg80211.h>

#include "iface.h"
#include "hcmd.h"
#include "key.h"
#include "mlo.h"
#include "mac80211.h"

#include "fw/api/context.h"
#include "fw/api/mac.h"
#include "fw/api/time-event.h"
#include "fw/api/datapath.h"

/* Cleanup function for struct iwl_mld_vif, will be called in restart */
void iwl_mld_cleanup_vif(void *data, u8 *mac, struct ieee80211_vif *vif)
{
        struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(vif);
        struct iwl_mld *mld = mld_vif->mld;
        struct iwl_mld_link *link;

        mld_vif->emlsr.blocked_reasons &= ~IWL_MLD_EMLSR_BLOCKED_ROC;

        if (mld_vif->aux_sta.sta_id != IWL_INVALID_STA)
                iwl_mld_free_internal_sta(mld, &mld_vif->aux_sta);

        /* EMLSR is turned back on during recovery */
        vif->driver_flags &= ~IEEE80211_VIF_EML_ACTIVE;

        if (mld_vif->roc_activity != ROC_NUM_ACTIVITIES)
                ieee80211_remain_on_channel_expired(mld->hw);

        mld_vif->roc_activity = ROC_NUM_ACTIVITIES;

        for_each_mld_vif_valid_link(mld_vif, link) {
                iwl_mld_cleanup_link(mld_vif->mld, link);

                /* Correctly allocated primary link in non-MLO mode */
                if (!ieee80211_vif_is_mld(vif) &&
                    link_id == 0 && link == &mld_vif->deflink)
                        continue;

                if (vif->active_links & BIT(link_id))
                        continue;

                /* Should not happen as link removal should always succeed */
                WARN_ON(1);
                if (link != &mld_vif->deflink)
                        kfree_rcu(link, rcu_head);
                RCU_INIT_POINTER(mld_vif->link[link_id], NULL);
        }

        ieee80211_iter_keys(mld->hw, vif, iwl_mld_cleanup_keys_iter, NULL);

        CLEANUP_STRUCT(mld_vif);
}

static int iwl_mld_send_mac_cmd(struct iwl_mld *mld,
                                struct iwl_mac_config_cmd *cmd)
{
        int ret;

        lockdep_assert_wiphy(mld->wiphy);

        ret = iwl_mld_send_cmd_pdu(mld,
                                   WIDE_ID(MAC_CONF_GROUP, MAC_CONFIG_CMD),
                                   cmd);
        if (ret)
                IWL_ERR(mld, "Failed to send MAC_CONFIG_CMD ret = %d\n", ret);

        return ret;
}

int iwl_mld_mac80211_iftype_to_fw(const struct ieee80211_vif *vif)
{
        switch (vif->type) {
        case NL80211_IFTYPE_STATION:
                return vif->p2p ? FW_MAC_TYPE_P2P_STA : FW_MAC_TYPE_BSS_STA;
        case NL80211_IFTYPE_AP:
                return FW_MAC_TYPE_GO;
        case NL80211_IFTYPE_MONITOR:
                return FW_MAC_TYPE_LISTENER;
        case NL80211_IFTYPE_P2P_DEVICE:
                return FW_MAC_TYPE_P2P_DEVICE;
        case NL80211_IFTYPE_ADHOC:
                return FW_MAC_TYPE_IBSS;
        default:
                WARN_ON_ONCE(1);
        }
        return FW_MAC_TYPE_BSS_STA;
}

static bool iwl_mld_is_nic_ack_enabled(struct iwl_mld *mld,
                                       struct ieee80211_vif *vif)
{
        const struct ieee80211_supported_band *sband;
        const struct ieee80211_sta_he_cap *own_he_cap;

        lockdep_assert_wiphy(mld->wiphy);

        /* This capability is the same for all bands,
         * so take it from one of them.
         */
        sband = mld->hw->wiphy->bands[NL80211_BAND_2GHZ];
        own_he_cap = ieee80211_get_he_iftype_cap_vif(sband, vif);

        return own_he_cap && (own_he_cap->he_cap_elem.mac_cap_info[2] &
                               IEEE80211_HE_MAC_CAP2_ACK_EN);
}

struct iwl_mld_mac_wifi_gen_sta_iter_data {
        struct ieee80211_vif *vif;
        struct iwl_mac_wifi_gen_support *support;
};

static void iwl_mld_mac_wifi_gen_sta_iter(void *_data,
                                          struct ieee80211_sta *sta)
{
        struct iwl_mld_sta *mld_sta = iwl_mld_sta_from_mac80211(sta);
        struct iwl_mld_mac_wifi_gen_sta_iter_data *data = _data;
        struct ieee80211_link_sta *link_sta;
        unsigned int link_id;

        if (mld_sta->vif != data->vif)
                return;

        for_each_sta_active_link(data->vif, sta, link_sta, link_id) {
                if (link_sta->he_cap.has_he)
                        data->support->he_support = 1;
                if (link_sta->eht_cap.has_eht)
                        data->support->eht_support = 1;
        }
}

static void iwl_mld_set_wifi_gen(struct iwl_mld *mld,
                                 struct ieee80211_vif *vif,
                                 struct iwl_mac_wifi_gen_support *support)
{
        struct iwl_mld_mac_wifi_gen_sta_iter_data sta_iter_data = {
                .vif = vif,
                .support = support,
        };
        struct ieee80211_bss_conf *link_conf;
        unsigned int link_id;

        switch (vif->type) {
        case NL80211_IFTYPE_MONITOR:
                /* for sniffer, set to HW capabilities */
                support->he_support = 1;
                support->eht_support = mld->trans->cfg->eht_supported;
                break;
        case NL80211_IFTYPE_AP:
                /* for AP set according to the link configs */
                for_each_vif_active_link(vif, link_conf, link_id) {
                        support->he_ap_support |= link_conf->he_support;
                        support->eht_support |= link_conf->eht_support;
                }
                break;
        default:
                /*
                 * If we have MLO enabled, then the firmware needs to enable
                 * address translation for the station(s) we add. That depends
                 * on having EHT enabled in firmware, which in turn depends on
                 * mac80211 in the iteration below.
                 * However, mac80211 doesn't enable capabilities on the AP STA
                 * until it has parsed the association response successfully,
                 * so set EHT (and HE as a pre-requisite for EHT) when the vif
                 * is an MLD.
                 */
                if (ieee80211_vif_is_mld(vif)) {
                        support->he_support = 1;
                        support->eht_support = 1;
                }

                ieee80211_iterate_stations_mtx(mld->hw,
                                               iwl_mld_mac_wifi_gen_sta_iter,
                                               &sta_iter_data);
                break;
        }
}

/* fill the common part for all interface types */
static void iwl_mld_mac_cmd_fill_common(struct iwl_mld *mld,
                                        struct ieee80211_vif *vif,
                                        struct iwl_mac_config_cmd *cmd,
                                        u32 action)
{
        struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(vif);

        lockdep_assert_wiphy(mld->wiphy);

        cmd->id_and_color = cpu_to_le32(mld_vif->fw_id);
        cmd->action = cpu_to_le32(action);

        cmd->mac_type =
                cpu_to_le32(iwl_mld_mac80211_iftype_to_fw(vif));

        memcpy(cmd->local_mld_addr, vif->addr, ETH_ALEN);

        if (iwlwifi_mod_params.disable_11ax)
                return;

        cmd->nic_not_ack_enabled =
                cpu_to_le32(!iwl_mld_is_nic_ack_enabled(mld, vif));

        iwl_mld_set_wifi_gen(mld, vif, &cmd->wifi_gen);
}

static void iwl_mld_fill_mac_cmd_sta(struct iwl_mld *mld,
                                     struct ieee80211_vif *vif, u32 action,
                                     struct iwl_mac_config_cmd *cmd)
{
        struct ieee80211_bss_conf *link;
        u32 twt_policy = 0;
        int link_id;

        lockdep_assert_wiphy(mld->wiphy);

        WARN_ON(vif->type != NL80211_IFTYPE_STATION);

        /* We always want to hear MCAST frames, if we're not authorized yet,
         * we'll drop them.
         */
        cmd->filter_flags |= cpu_to_le32(MAC_CFG_FILTER_ACCEPT_GRP);

        /* Adding a MAC ctxt with is_assoc set is not allowed in fw
         * (and shouldn't happen)
         */
        if (vif->cfg.assoc && action != FW_CTXT_ACTION_ADD) {
                cmd->client.is_assoc = 1;

                if (!iwl_mld_vif_from_mac80211(vif)->authorized)
                        cmd->client.data_policy |=
                                cpu_to_le16(COEX_HIGH_PRIORITY_ENABLE);
        } else {
                /* Allow beacons to pass through as long as we are not
                 * associated
                 */
                cmd->filter_flags |= cpu_to_le32(MAC_CFG_FILTER_ACCEPT_BEACON);
        }

        cmd->client.assoc_id = cpu_to_le16(vif->cfg.aid);

        if (ieee80211_vif_is_mld(vif)) {
                u16 esr_transition_timeout =
                        u16_get_bits(vif->cfg.eml_cap,
                                     IEEE80211_EML_CAP_TRANSITION_TIMEOUT);

                cmd->client.esr_transition_timeout =
                        min_t(u16, IEEE80211_EML_CAP_TRANSITION_TIMEOUT_128TU,
                              esr_transition_timeout);
                cmd->client.medium_sync_delay =
                        cpu_to_le16(vif->cfg.eml_med_sync_delay);
        }

        for_each_vif_active_link(vif, link, link_id) {
                if (!link->he_support)
                        continue;

                if (link->twt_requester)
                        twt_policy |= TWT_SUPPORTED;
                if (link->twt_protected)
                        twt_policy |= PROTECTED_TWT_SUPPORTED;
                if (link->twt_broadcast)
                        twt_policy |= BROADCAST_TWT_SUPPORTED;
        }

        if (!iwlwifi_mod_params.disable_11ax)
                cmd->client.data_policy |= cpu_to_le16(twt_policy);

        if (vif->probe_req_reg && vif->cfg.assoc && vif->p2p)
                cmd->filter_flags |=
                        cpu_to_le32(MAC_CFG_FILTER_ACCEPT_PROBE_REQ);
}

static void iwl_mld_fill_mac_cmd_ap(struct iwl_mld *mld,
                                    struct ieee80211_vif *vif,
                                    struct iwl_mac_config_cmd *cmd)
{
        struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(vif);

        lockdep_assert_wiphy(mld->wiphy);

        WARN_ON(vif->type != NL80211_IFTYPE_AP);

        cmd->filter_flags |= cpu_to_le32(MAC_CFG_FILTER_ACCEPT_PROBE_REQ);

        /* in AP mode, pass beacons from other APs (needed for ht protection).
         * When there're no any associated station, which means that we are not
         * TXing anyway, don't ask FW to pass beacons to prevent unnecessary
         * wake-ups.
         */
        if (mld_vif->num_associated_stas)
                cmd->filter_flags |= cpu_to_le32(MAC_CFG_FILTER_ACCEPT_BEACON);
}

static void iwl_mld_go_iterator(void *_data, u8 *mac, struct ieee80211_vif *vif)
{
        bool *go_active = _data;

        if (ieee80211_vif_type_p2p(vif) == NL80211_IFTYPE_P2P_GO &&
            iwl_mld_vif_from_mac80211(vif)->ap_ibss_active)
                *go_active = true;
}

static bool iwl_mld_p2p_dev_has_extended_disc(struct iwl_mld *mld)
{
        bool go_active = false;

        /* This flag should be set to true when the P2P Device is
         * discoverable and there is at least a P2P GO. Setting
         * this flag will allow the P2P Device to be discoverable on other
         * channels in addition to its listen channel.
         * Note that this flag should not be set in other cases as it opens the
         * Rx filters on all MAC and increases the number of interrupts.
         */
        ieee80211_iterate_active_interfaces(mld->hw,
                                            IEEE80211_IFACE_ITER_RESUME_ALL,
                                            iwl_mld_go_iterator, &go_active);

        return go_active;
}

static void iwl_mld_fill_mac_cmd_p2p_dev(struct iwl_mld *mld,
                                         struct ieee80211_vif *vif,
                                         struct iwl_mac_config_cmd *cmd)
{
        bool ext_disc = iwl_mld_p2p_dev_has_extended_disc(mld);

        lockdep_assert_wiphy(mld->wiphy);

        /* Override the filter flags to accept all management frames. This is
         * needed to support both P2P device discovery using probe requests and
         * P2P service discovery using action frames
         */
        cmd->filter_flags = cpu_to_le32(MAC_CFG_FILTER_ACCEPT_CONTROL_AND_MGMT);

        if (ext_disc)
                cmd->p2p_dev.is_disc_extended = cpu_to_le32(1);
}

static void iwl_mld_fill_mac_cmd_ibss(struct iwl_mld *mld,
                                      struct ieee80211_vif *vif,
                                      struct iwl_mac_config_cmd *cmd)
{
        lockdep_assert_wiphy(mld->wiphy);

        WARN_ON(vif->type != NL80211_IFTYPE_ADHOC);

        cmd->filter_flags |= cpu_to_le32(MAC_CFG_FILTER_ACCEPT_BEACON |
                                         MAC_CFG_FILTER_ACCEPT_PROBE_REQ |
                                         MAC_CFG_FILTER_ACCEPT_GRP);
}

static int
iwl_mld_rm_mac_from_fw(struct iwl_mld *mld, struct ieee80211_vif *vif)
{
        struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(vif);
        struct iwl_mac_config_cmd cmd = {
                .action = cpu_to_le32(FW_CTXT_ACTION_REMOVE),
                .id_and_color = cpu_to_le32(mld_vif->fw_id),
        };

        return iwl_mld_send_mac_cmd(mld, &cmd);
}

int iwl_mld_mac_fw_action(struct iwl_mld *mld, struct ieee80211_vif *vif,
                          u32 action)
{
        struct iwl_mac_config_cmd cmd = {};

        lockdep_assert_wiphy(mld->wiphy);

        /* NAN interface type is not known to FW */
        if (vif->type == NL80211_IFTYPE_NAN)
                return 0;

        if (action == FW_CTXT_ACTION_REMOVE)
                return iwl_mld_rm_mac_from_fw(mld, vif);

        iwl_mld_mac_cmd_fill_common(mld, vif, &cmd, action);

        switch (vif->type) {
        case NL80211_IFTYPE_STATION:
                iwl_mld_fill_mac_cmd_sta(mld, vif, action, &cmd);
                break;
        case NL80211_IFTYPE_AP:
                iwl_mld_fill_mac_cmd_ap(mld, vif, &cmd);
                break;
        case NL80211_IFTYPE_MONITOR:
                cmd.filter_flags =
                        cpu_to_le32(MAC_CFG_FILTER_PROMISC |
                                    MAC_CFG_FILTER_ACCEPT_CONTROL_AND_MGMT |
                                    MAC_CFG_FILTER_ACCEPT_BEACON |
                                    MAC_CFG_FILTER_ACCEPT_PROBE_REQ |
                                    MAC_CFG_FILTER_ACCEPT_GRP);
                break;
        case NL80211_IFTYPE_P2P_DEVICE:
                iwl_mld_fill_mac_cmd_p2p_dev(mld, vif, &cmd);
                break;
        case NL80211_IFTYPE_ADHOC:
                iwl_mld_fill_mac_cmd_ibss(mld, vif, &cmd);
                break;
        default:
                WARN(1, "not supported yet\n");
                return -EOPNOTSUPP;
        }

        return iwl_mld_send_mac_cmd(mld, &cmd);
}

static void iwl_mld_mlo_scan_start_wk(struct wiphy *wiphy,
                                      struct wiphy_work *wk)
{
        struct iwl_mld_vif *mld_vif = container_of(wk, struct iwl_mld_vif,
                                                   mlo_scan_start_wk.work);
        struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
        struct iwl_mld *mld = IWL_MAC80211_GET_MLD(hw);

        iwl_mld_int_mlo_scan(mld, iwl_mld_vif_to_mac80211(mld_vif));
}

IWL_MLD_ALLOC_FN(vif, vif)

/* Constructor function for struct iwl_mld_vif */
static void
iwl_mld_init_vif(struct iwl_mld *mld, struct ieee80211_vif *vif)
{
        struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(vif);

        lockdep_assert_wiphy(mld->wiphy);

        mld_vif->mld = mld;
        mld_vif->roc_activity = ROC_NUM_ACTIVITIES;

        if (!mld->fw_status.in_hw_restart) {
                wiphy_work_init(&mld_vif->emlsr.unblock_tpt_wk,
                                iwl_mld_emlsr_unblock_tpt_wk);
                wiphy_delayed_work_init(&mld_vif->emlsr.check_tpt_wk,
                                        iwl_mld_emlsr_check_tpt);
                wiphy_delayed_work_init(&mld_vif->emlsr.prevent_done_wk,
                                        iwl_mld_emlsr_prevent_done_wk);
                wiphy_delayed_work_init(&mld_vif->emlsr.tmp_non_bss_done_wk,
                                        iwl_mld_emlsr_tmp_non_bss_done_wk);
                wiphy_delayed_work_init(&mld_vif->mlo_scan_start_wk,
                                        iwl_mld_mlo_scan_start_wk);
        }
        iwl_mld_init_internal_sta(&mld_vif->aux_sta);
}

int iwl_mld_add_vif(struct iwl_mld *mld, struct ieee80211_vif *vif)
{
        struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(vif);
        int ret;

        lockdep_assert_wiphy(mld->wiphy);

        iwl_mld_init_vif(mld, vif);

        /* NAN interface type is not known to FW */
        if (vif->type == NL80211_IFTYPE_NAN)
                return 0;

        ret = iwl_mld_allocate_vif_fw_id(mld, &mld_vif->fw_id, vif);
        if (ret)
                return ret;

        ret = iwl_mld_mac_fw_action(mld, vif, FW_CTXT_ACTION_ADD);
        if (ret)
                RCU_INIT_POINTER(mld->fw_id_to_vif[mld_vif->fw_id], NULL);

        return ret;
}

void iwl_mld_rm_vif(struct iwl_mld *mld, struct ieee80211_vif *vif)
{
        struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(vif);

        lockdep_assert_wiphy(mld->wiphy);

        iwl_mld_mac_fw_action(mld, vif, FW_CTXT_ACTION_REMOVE);

        if (WARN_ON(mld_vif->fw_id >= ARRAY_SIZE(mld->fw_id_to_vif)))
                return;

        RCU_INIT_POINTER(mld->fw_id_to_vif[mld_vif->fw_id], NULL);

        iwl_mld_cancel_notifications_of_object(mld, IWL_MLD_OBJECT_TYPE_VIF,
                                               mld_vif->fw_id);
}

void iwl_mld_set_vif_associated(struct iwl_mld *mld,
                                struct ieee80211_vif *vif)
{
        struct ieee80211_bss_conf *link;
        unsigned int link_id;

        for_each_vif_active_link(vif, link, link_id) {
                if (iwl_mld_link_set_associated(mld, vif, link))
                        IWL_ERR(mld, "failed to update link %d\n", link_id);
        }

        iwl_mld_recalc_multicast_filter(mld);
}

static void iwl_mld_get_fw_id_bss_bitmap_iter(void *_data, u8 *mac,
                                              struct ieee80211_vif *vif)
{
        u8 *fw_id_bitmap = _data;
        struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(vif);

        if (ieee80211_vif_type_p2p(vif) != NL80211_IFTYPE_STATION)
                return;

        *fw_id_bitmap |= BIT(mld_vif->fw_id);
}

u8 iwl_mld_get_fw_bss_vifs_ids(struct iwl_mld *mld)
{
        u8 fw_id_bitmap = 0;

        ieee80211_iterate_active_interfaces_mtx(mld->hw,
                                                IEEE80211_IFACE_SKIP_SDATA_NOT_IN_DRIVER,
                                                iwl_mld_get_fw_id_bss_bitmap_iter,
                                                &fw_id_bitmap);

        return fw_id_bitmap;
}

void iwl_mld_handle_probe_resp_data_notif(struct iwl_mld *mld,
                                          struct iwl_rx_packet *pkt)
{
        const struct iwl_probe_resp_data_notif *notif = (void *)pkt->data;
        struct iwl_probe_resp_data *old_data, *new_data;
        struct ieee80211_vif *vif;
        struct iwl_mld_link *mld_link;

        IWL_DEBUG_INFO(mld, "Probe response data notif: noa %d, csa %d\n",
                       notif->noa_active, notif->csa_counter);

        if (IWL_FW_CHECK(mld, le32_to_cpu(notif->mac_id) >=
                         ARRAY_SIZE(mld->fw_id_to_vif),
                         "mac id is invalid: %d\n",
                         le32_to_cpu(notif->mac_id)))
                return;

        vif = wiphy_dereference(mld->wiphy,
                                mld->fw_id_to_vif[le32_to_cpu(notif->mac_id)]);

        /* the firmware gives us the mac_id (and not the link_id), mac80211
         * gets a vif and not a link, bottom line, this flow is not MLD ready
         * yet.
         */
        if (WARN_ON(!vif) || ieee80211_vif_is_mld(vif))
                return;

        if (notif->csa_counter != IWL_PROBE_RESP_DATA_NO_CSA &&
            notif->csa_counter >= 1)
                ieee80211_beacon_set_cntdwn(vif, notif->csa_counter);

        if (!vif->p2p)
                return;

        mld_link = &iwl_mld_vif_from_mac80211(vif)->deflink;

        /* len_low should be 2 + n*13 (where n is the number of descriptors.
         * 13 is the size of a NoA descriptor). We can have either one or two
         * descriptors.
         */
        if (IWL_FW_CHECK(mld, notif->noa_active &&
                         notif->noa_attr.len_low != 2 +
                         sizeof(struct ieee80211_p2p_noa_desc) &&
                         notif->noa_attr.len_low != 2 +
                         sizeof(struct ieee80211_p2p_noa_desc) * 2,
                         "Invalid noa_attr.len_low (%d)\n",
                         notif->noa_attr.len_low))
                return;

        new_data = kzalloc_obj(*new_data);
        if (!new_data)
                return;

        memcpy(&new_data->notif, notif, sizeof(new_data->notif));

        /* noa_attr contains 1 reserved byte, need to substruct it */
        new_data->noa_len = sizeof(struct ieee80211_vendor_ie) +
                            sizeof(new_data->notif.noa_attr) - 1;

        /*
         * If it's a one time NoA, only one descriptor is needed,
         * adjust the length according to len_low.
         */
        if (new_data->notif.noa_attr.len_low ==
            sizeof(struct ieee80211_p2p_noa_desc) + 2)
                new_data->noa_len -= sizeof(struct ieee80211_p2p_noa_desc);

        old_data = wiphy_dereference(mld->wiphy, mld_link->probe_resp_data);
        rcu_assign_pointer(mld_link->probe_resp_data, new_data);

        if (old_data)
                kfree_rcu(old_data, rcu_head);
}

void iwl_mld_handle_uapsd_misbehaving_ap_notif(struct iwl_mld *mld,
                                               struct iwl_rx_packet *pkt)
{
        struct iwl_uapsd_misbehaving_ap_notif *notif = (void *)pkt->data;
        struct ieee80211_vif *vif;

        if (IWL_FW_CHECK(mld, notif->mac_id >= ARRAY_SIZE(mld->fw_id_to_vif),
                         "mac id is invalid: %d\n", notif->mac_id))
                return;

        vif = wiphy_dereference(mld->wiphy, mld->fw_id_to_vif[notif->mac_id]);

        if (WARN_ON(!vif) || ieee80211_vif_is_mld(vif))
                return;

        IWL_WARN(mld, "uapsd misbehaving AP: %pM\n", vif->bss_conf.bssid);
}

void iwl_mld_handle_datapath_monitor_notif(struct iwl_mld *mld,
                                           struct iwl_rx_packet *pkt)
{
        struct iwl_datapath_monitor_notif *notif = (void *)pkt->data;
        struct ieee80211_bss_conf *link;
        struct ieee80211_supported_band *sband;
        const struct ieee80211_sta_he_cap *he_cap;
        struct ieee80211_vif *vif;
        struct iwl_mld_vif *mld_vif;

        if (notif->type != cpu_to_le32(IWL_DP_MON_NOTIF_TYPE_EXT_CCA))
                return;

        link = iwl_mld_fw_id_to_link_conf(mld, notif->link_id);
        if (WARN_ON(!link))
                return;

        vif = link->vif;
        if (WARN_ON(!vif) || vif->type != NL80211_IFTYPE_STATION ||
            !vif->cfg.assoc)
                return;

        if (!link->chanreq.oper.chan ||
            link->chanreq.oper.chan->band != NL80211_BAND_2GHZ ||
            link->chanreq.oper.width < NL80211_CHAN_WIDTH_40)
                return;

        mld_vif = iwl_mld_vif_from_mac80211(vif);

        /* this shouldn't happen *again*, ignore it */
        if (mld_vif->cca_40mhz_workaround != CCA_40_MHZ_WA_NONE)
                return;

        mld_vif->cca_40mhz_workaround = CCA_40_MHZ_WA_RECONNECT;

        /*
         * This capability manipulation isn't really ideal, but it's the
         * easiest choice - otherwise we'd have to do some major changes
         * in mac80211 to support this, which isn't worth it. This does
         * mean that userspace may have outdated information, but that's
         * actually not an issue at all.
         */
        sband = mld->wiphy->bands[NL80211_BAND_2GHZ];

        WARN_ON(!sband->ht_cap.ht_supported);
        WARN_ON(!(sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40));
        sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;

        he_cap = ieee80211_get_he_iftype_cap_vif(sband, vif);

        if (he_cap) {
                /* we know that ours is writable */
                struct ieee80211_sta_he_cap *he = (void *)(uintptr_t)he_cap;

                WARN_ON(!he->has_he);
                WARN_ON(!(he->he_cap_elem.phy_cap_info[0] &
                          IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_IN_2G));
                he->he_cap_elem.phy_cap_info[0] &=
                        ~IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_IN_2G;
        }

        ieee80211_disconnect(vif, true);
}

void iwl_mld_reset_cca_40mhz_workaround(struct iwl_mld *mld,
                                        struct ieee80211_vif *vif)
{
        struct ieee80211_supported_band *sband;
        const struct ieee80211_sta_he_cap *he_cap;
        struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(vif);

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

        if (mld_vif->cca_40mhz_workaround == CCA_40_MHZ_WA_NONE)
                return;

        /* Now we are just reconnecting with the new capabilities,
         * but remember to reset the capabilities when we disconnect for real
         */
        if (mld_vif->cca_40mhz_workaround == CCA_40_MHZ_WA_RECONNECT) {
                mld_vif->cca_40mhz_workaround = CCA_40_MHZ_WA_RESET;
                return;
        }

        /* Now cca_40mhz_workaround == CCA_40_MHZ_WA_RESET */

        sband = mld->wiphy->bands[NL80211_BAND_2GHZ];

        sband->ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;

        he_cap = ieee80211_get_he_iftype_cap_vif(sband, vif);

        if (he_cap) {
                /* we know that ours is writable */
                struct ieee80211_sta_he_cap *he = (void *)(uintptr_t)he_cap;

                he->he_cap_elem.phy_cap_info[0] |=
                        IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_IN_2G;
        }

        mld_vif->cca_40mhz_workaround = CCA_40_MHZ_WA_NONE;
}

struct ieee80211_vif *iwl_mld_get_bss_vif(struct iwl_mld *mld)
{
        unsigned long fw_id_bitmap = iwl_mld_get_fw_bss_vifs_ids(mld);
        int fw_id;

        if (hweight8(fw_id_bitmap) != 1)
                return NULL;

        fw_id = __ffs(fw_id_bitmap);

        return wiphy_dereference(mld->wiphy,
                                 mld->fw_id_to_vif[fw_id]);
}