// SPDX-License-Identifier: GPL-2.0
/*
 * cfg80211 - wext compat code
 *
 * This is temporary code until all wireless functionality is migrated
 * into cfg80211, when that happens all the exports here go away and
 * we directly assign the wireless handlers of wireless interfaces.
 *
 * Copyright 2008-2009  Johannes Berg <johannes@sipsolutions.net>
 * Copyright (C) 2019-2023 Intel Corporation
 */

#include <linux/export.h>
#include <linux/wireless.h>
#include <linux/nl80211.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/slab.h>
#include <net/iw_handler.h>
#include <net/cfg80211.h>
#include <net/cfg80211-wext.h>
#include "wext-compat.h"
#include "core.h"
#include "rdev-ops.h"

int cfg80211_wext_giwname(struct net_device *dev,
                          struct iw_request_info *info,
                          union iwreq_data *wrqu, char *extra)
{
        strcpy(wrqu->name, "IEEE 802.11");
        return 0;
}

int cfg80211_wext_siwmode(struct net_device *dev, struct iw_request_info *info,
                          union iwreq_data *wrqu, char *extra)
{
        __u32 *mode = &wrqu->mode;
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev;
        struct vif_params vifparams;
        enum nl80211_iftype type;

        rdev = wiphy_to_rdev(wdev->wiphy);

        switch (*mode) {
        case IW_MODE_INFRA:
                type = NL80211_IFTYPE_STATION;
                break;
        case IW_MODE_ADHOC:
                type = NL80211_IFTYPE_ADHOC;
                break;
        case IW_MODE_MONITOR:
                type = NL80211_IFTYPE_MONITOR;
                break;
        default:
                return -EINVAL;
        }

        if (type == wdev->iftype)
                return 0;

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

        guard(wiphy)(wdev->wiphy);

        return cfg80211_change_iface(rdev, dev, type, &vifparams);
}

int cfg80211_wext_giwmode(struct net_device *dev, struct iw_request_info *info,
                          union iwreq_data *wrqu, char *extra)
{
        __u32 *mode = &wrqu->mode;
        struct wireless_dev *wdev = dev->ieee80211_ptr;

        if (!wdev)
                return -EOPNOTSUPP;

        switch (wdev->iftype) {
        case NL80211_IFTYPE_AP:
                *mode = IW_MODE_MASTER;
                break;
        case NL80211_IFTYPE_STATION:
                *mode = IW_MODE_INFRA;
                break;
        case NL80211_IFTYPE_ADHOC:
                *mode = IW_MODE_ADHOC;
                break;
        case NL80211_IFTYPE_MONITOR:
                *mode = IW_MODE_MONITOR;
                break;
        case NL80211_IFTYPE_WDS:
                *mode = IW_MODE_REPEAT;
                break;
        case NL80211_IFTYPE_AP_VLAN:
                *mode = IW_MODE_SECOND;         /* FIXME */
                break;
        default:
                *mode = IW_MODE_AUTO;
                break;
        }
        return 0;
}


int cfg80211_wext_giwrange(struct net_device *dev,
                           struct iw_request_info *info,
                           union iwreq_data *wrqu, char *extra)
{
        struct iw_point *data = &wrqu->data;
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct iw_range *range = (struct iw_range *) extra;
        enum nl80211_band band;
        int i, c = 0;

        if (!wdev)
                return -EOPNOTSUPP;

        data->length = sizeof(struct iw_range);
        memset(range, 0, sizeof(struct iw_range));

        range->we_version_compiled = WIRELESS_EXT;
        range->we_version_source = 21;
        range->retry_capa = IW_RETRY_LIMIT;
        range->retry_flags = IW_RETRY_LIMIT;
        range->min_retry = 0;
        range->max_retry = 255;
        range->min_rts = 0;
        range->max_rts = 2347;
        range->min_frag = 256;
        range->max_frag = 2346;

        range->max_encoding_tokens = 4;

        range->max_qual.updated = IW_QUAL_NOISE_INVALID;

        switch (wdev->wiphy->signal_type) {
        case CFG80211_SIGNAL_TYPE_NONE:
                break;
        case CFG80211_SIGNAL_TYPE_MBM:
                range->max_qual.level = (u8)-110;
                range->max_qual.qual = 70;
                range->avg_qual.qual = 35;
                range->max_qual.updated |= IW_QUAL_DBM;
                range->max_qual.updated |= IW_QUAL_QUAL_UPDATED;
                range->max_qual.updated |= IW_QUAL_LEVEL_UPDATED;
                break;
        case CFG80211_SIGNAL_TYPE_UNSPEC:
                range->max_qual.level = 100;
                range->max_qual.qual = 100;
                range->avg_qual.qual = 50;
                range->max_qual.updated |= IW_QUAL_QUAL_UPDATED;
                range->max_qual.updated |= IW_QUAL_LEVEL_UPDATED;
                break;
        }

        range->avg_qual.level = range->max_qual.level / 2;
        range->avg_qual.noise = range->max_qual.noise / 2;
        range->avg_qual.updated = range->max_qual.updated;

        for (i = 0; i < wdev->wiphy->n_cipher_suites; i++) {
                switch (wdev->wiphy->cipher_suites[i]) {
                case WLAN_CIPHER_SUITE_TKIP:
                        range->enc_capa |= (IW_ENC_CAPA_CIPHER_TKIP |
                                            IW_ENC_CAPA_WPA);
                        break;

                case WLAN_CIPHER_SUITE_CCMP:
                        range->enc_capa |= (IW_ENC_CAPA_CIPHER_CCMP |
                                            IW_ENC_CAPA_WPA2);
                        break;

                case WLAN_CIPHER_SUITE_WEP40:
                        range->encoding_size[range->num_encoding_sizes++] =
                                WLAN_KEY_LEN_WEP40;
                        break;

                case WLAN_CIPHER_SUITE_WEP104:
                        range->encoding_size[range->num_encoding_sizes++] =
                                WLAN_KEY_LEN_WEP104;
                        break;
                }
        }

        for (band = 0; band < NUM_NL80211_BANDS; band ++) {
                struct ieee80211_supported_band *sband;

                sband = wdev->wiphy->bands[band];

                if (!sband)
                        continue;

                for (i = 0; i < sband->n_channels && c < IW_MAX_FREQUENCIES; i++) {
                        struct ieee80211_channel *chan = &sband->channels[i];

                        if (!(chan->flags & IEEE80211_CHAN_DISABLED)) {
                                range->freq[c].i =
                                        ieee80211_frequency_to_channel(
                                                chan->center_freq);
                                range->freq[c].m = chan->center_freq;
                                range->freq[c].e = 6;
                                c++;
                        }
                }
        }
        range->num_channels = c;
        range->num_frequency = c;

        IW_EVENT_CAPA_SET_KERNEL(range->event_capa);
        IW_EVENT_CAPA_SET(range->event_capa, SIOCGIWAP);
        IW_EVENT_CAPA_SET(range->event_capa, SIOCGIWSCAN);

        if (wdev->wiphy->max_scan_ssids > 0)
                range->scan_capa |= IW_SCAN_CAPA_ESSID;

        return 0;
}


/**
 * cfg80211_wext_freq - get wext frequency for non-"auto"
 * @freq: the wext freq encoding
 *
 * Returns: a frequency, or a negative error code, or 0 for auto.
 */
int cfg80211_wext_freq(struct iw_freq *freq)
{
        /*
         * Parse frequency - return 0 for auto and
         * -EINVAL for impossible things.
         */
        if (freq->e == 0) {
                enum nl80211_band band = NL80211_BAND_2GHZ;
                if (freq->m < 0)
                        return 0;
                if (freq->m > 14)
                        band = NL80211_BAND_5GHZ;
                return ieee80211_channel_to_frequency(freq->m, band);
        } else {
                int i, div = 1000000;
                for (i = 0; i < freq->e; i++)
                        div /= 10;
                if (div <= 0)
                        return -EINVAL;
                return freq->m / div;
        }
}

int cfg80211_wext_siwrts(struct net_device *dev,
                         struct iw_request_info *info,
                         union iwreq_data *wrqu, char *extra)
{
        struct iw_param *rts = &wrqu->rts;
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        u32 orts = wdev->wiphy->rts_threshold;
        int err;

        guard(wiphy)(&rdev->wiphy);
        if (rts->disabled || !rts->fixed)
                wdev->wiphy->rts_threshold = (u32) -1;
        else if (rts->value < 0)
                return -EINVAL;
        else
                wdev->wiphy->rts_threshold = rts->value;

        err = rdev_set_wiphy_params(rdev, -1, WIPHY_PARAM_RTS_THRESHOLD);
        if (err)
                wdev->wiphy->rts_threshold = orts;
        return err;
}

int cfg80211_wext_giwrts(struct net_device *dev,
                         struct iw_request_info *info,
                         union iwreq_data *wrqu, char *extra)
{
        struct iw_param *rts = &wrqu->rts;
        struct wireless_dev *wdev = dev->ieee80211_ptr;

        rts->value = wdev->wiphy->rts_threshold;
        rts->disabled = rts->value == (u32) -1;
        rts->fixed = 1;

        return 0;
}

int cfg80211_wext_siwfrag(struct net_device *dev,
                          struct iw_request_info *info,
                          union iwreq_data *wrqu, char *extra)
{
        struct iw_param *frag = &wrqu->frag;
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        u32 ofrag = wdev->wiphy->frag_threshold;
        int err;

        guard(wiphy)(&rdev->wiphy);

        if (frag->disabled || !frag->fixed) {
                wdev->wiphy->frag_threshold = (u32) -1;
        } else if (frag->value < 256) {
                return -EINVAL;
        } else {
                /* Fragment length must be even, so strip LSB. */
                wdev->wiphy->frag_threshold = frag->value & ~0x1;
        }

        err = rdev_set_wiphy_params(rdev, -1, WIPHY_PARAM_FRAG_THRESHOLD);
        if (err)
                wdev->wiphy->frag_threshold = ofrag;
        return err;
}

int cfg80211_wext_giwfrag(struct net_device *dev,
                          struct iw_request_info *info,
                          union iwreq_data *wrqu, char *extra)
{
        struct iw_param *frag = &wrqu->frag;
        struct wireless_dev *wdev = dev->ieee80211_ptr;

        frag->value = wdev->wiphy->frag_threshold;
        frag->disabled = frag->value == (u32) -1;
        frag->fixed = 1;

        return 0;
}

static int cfg80211_wext_siwretry(struct net_device *dev,
                                  struct iw_request_info *info,
                                  union iwreq_data *wrqu, char *extra)
{
        struct iw_param *retry = &wrqu->retry;
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        u32 changed = 0;
        u8 olong = wdev->wiphy->retry_long;
        u8 oshort = wdev->wiphy->retry_short;
        int err;

        if (retry->disabled || retry->value < 1 || retry->value > 255 ||
            (retry->flags & IW_RETRY_TYPE) != IW_RETRY_LIMIT)
                return -EINVAL;

        guard(wiphy)(&rdev->wiphy);

        if (retry->flags & IW_RETRY_LONG) {
                wdev->wiphy->retry_long = retry->value;
                changed |= WIPHY_PARAM_RETRY_LONG;
        } else if (retry->flags & IW_RETRY_SHORT) {
                wdev->wiphy->retry_short = retry->value;
                changed |= WIPHY_PARAM_RETRY_SHORT;
        } else {
                wdev->wiphy->retry_short = retry->value;
                wdev->wiphy->retry_long = retry->value;
                changed |= WIPHY_PARAM_RETRY_LONG;
                changed |= WIPHY_PARAM_RETRY_SHORT;
        }

        err = rdev_set_wiphy_params(rdev, -1, changed);
        if (err) {
                wdev->wiphy->retry_short = oshort;
                wdev->wiphy->retry_long = olong;
        }

        return err;
}

int cfg80211_wext_giwretry(struct net_device *dev,
                           struct iw_request_info *info,
                           union iwreq_data *wrqu, char *extra)
{
        struct iw_param *retry = &wrqu->retry;
        struct wireless_dev *wdev = dev->ieee80211_ptr;

        retry->disabled = 0;

        if (retry->flags == 0 || (retry->flags & IW_RETRY_SHORT)) {
                /*
                 * First return short value, iwconfig will ask long value
                 * later if needed
                 */
                retry->flags |= IW_RETRY_LIMIT | IW_RETRY_SHORT;
                retry->value = wdev->wiphy->retry_short;
                if (wdev->wiphy->retry_long == wdev->wiphy->retry_short)
                        retry->flags |= IW_RETRY_LONG;

                return 0;
        }

        if (retry->flags & IW_RETRY_LONG) {
                retry->flags = IW_RETRY_LIMIT | IW_RETRY_LONG;
                retry->value = wdev->wiphy->retry_long;
        }

        return 0;
}

static int cfg80211_set_encryption(struct cfg80211_registered_device *rdev,
                                   struct net_device *dev, bool pairwise,
                                   const u8 *addr, bool remove, bool tx_key,
                                   int idx, struct key_params *params)
{
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        int err, i;
        bool rejoin = false;

        if (wdev->valid_links)
                return -EINVAL;

        if (pairwise && !addr)
                return -EINVAL;

        /*
         * In many cases we won't actually need this, but it's better
         * to do it first in case the allocation fails. Don't use wext.
         */
        if (!wdev->wext.keys) {
                wdev->wext.keys = kzalloc_obj(*wdev->wext.keys);
                if (!wdev->wext.keys)
                        return -ENOMEM;
                for (i = 0; i < 4; i++)
                        wdev->wext.keys->params[i].key =
                                wdev->wext.keys->data[i];
        }

        if (wdev->iftype != NL80211_IFTYPE_ADHOC &&
            wdev->iftype != NL80211_IFTYPE_STATION)
                return -EOPNOTSUPP;

        if (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC) {
                if (!wdev->connected)
                        return -ENOLINK;

                if (!rdev->ops->set_default_mgmt_key)
                        return -EOPNOTSUPP;

                if (idx < 4 || idx > 5)
                        return -EINVAL;
        } else if (idx < 0 || idx > 3)
                return -EINVAL;

        if (remove) {
                err = 0;
                if (wdev->connected ||
                    (wdev->iftype == NL80211_IFTYPE_ADHOC &&
                     wdev->u.ibss.current_bss)) {
                        /*
                         * If removing the current TX key, we will need to
                         * join a new IBSS without the privacy bit clear.
                         */
                        if (idx == wdev->wext.default_key &&
                            wdev->iftype == NL80211_IFTYPE_ADHOC) {
                                cfg80211_leave_ibss(rdev, wdev->netdev, true);
                                rejoin = true;
                        }

                        if (!pairwise && addr &&
                            !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
                                err = -ENOENT;
                        else
                                err = rdev_del_key(rdev, dev, -1, idx, pairwise,
                                                   addr);
                }
                wdev->wext.connect.privacy = false;
                /*
                 * Applications using wireless extensions expect to be
                 * able to delete keys that don't exist, so allow that.
                 */
                if (err == -ENOENT)
                        err = 0;
                if (!err) {
                        if (!addr && idx < 4) {
                                memset(wdev->wext.keys->data[idx], 0,
                                       sizeof(wdev->wext.keys->data[idx]));
                                wdev->wext.keys->params[idx].key_len = 0;
                                wdev->wext.keys->params[idx].cipher = 0;
                        }
                        if (idx == wdev->wext.default_key)
                                wdev->wext.default_key = -1;
                        else if (idx == wdev->wext.default_mgmt_key)
                                wdev->wext.default_mgmt_key = -1;
                }

                if (!err && rejoin)
                        err = cfg80211_ibss_wext_join(rdev, wdev);

                return err;
        }

        if (addr)
                tx_key = false;

        if (cfg80211_validate_key_settings(rdev, params, idx, pairwise, addr))
                return -EINVAL;

        err = 0;
        if (wdev->connected ||
            (wdev->iftype == NL80211_IFTYPE_ADHOC &&
             wdev->u.ibss.current_bss))
                err = rdev_add_key(rdev, dev, -1, idx, pairwise, addr, params);
        else if (params->cipher != WLAN_CIPHER_SUITE_WEP40 &&
                 params->cipher != WLAN_CIPHER_SUITE_WEP104)
                return -EINVAL;
        if (err)
                return err;

        /*
         * We only need to store WEP keys, since they're the only keys that
         * can be set before a connection is established and persist after
         * disconnecting.
         */
        if (!addr && (params->cipher == WLAN_CIPHER_SUITE_WEP40 ||
                      params->cipher == WLAN_CIPHER_SUITE_WEP104)) {
                wdev->wext.keys->params[idx] = *params;
                memcpy(wdev->wext.keys->data[idx],
                        params->key, params->key_len);
                wdev->wext.keys->params[idx].key =
                        wdev->wext.keys->data[idx];
        }

        if ((params->cipher == WLAN_CIPHER_SUITE_WEP40 ||
             params->cipher == WLAN_CIPHER_SUITE_WEP104) &&
            (tx_key || (!addr && wdev->wext.default_key == -1))) {
                if (wdev->connected ||
                    (wdev->iftype == NL80211_IFTYPE_ADHOC &&
                     wdev->u.ibss.current_bss)) {
                        /*
                         * If we are getting a new TX key from not having
                         * had one before we need to join a new IBSS with
                         * the privacy bit set.
                         */
                        if (wdev->iftype == NL80211_IFTYPE_ADHOC &&
                            wdev->wext.default_key == -1) {
                                cfg80211_leave_ibss(rdev, wdev->netdev, true);
                                rejoin = true;
                        }
                        err = rdev_set_default_key(rdev, dev, -1, idx, true,
                                                   true);
                }
                if (!err) {
                        wdev->wext.default_key = idx;
                        if (rejoin)
                                err = cfg80211_ibss_wext_join(rdev, wdev);
                }
                return err;
        }

        if (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC &&
            (tx_key || (!addr && wdev->wext.default_mgmt_key == -1))) {
                if (wdev->connected ||
                    (wdev->iftype == NL80211_IFTYPE_ADHOC &&
                     wdev->u.ibss.current_bss))
                        err = rdev_set_default_mgmt_key(rdev, dev, -1, idx);
                if (!err)
                        wdev->wext.default_mgmt_key = idx;
                return err;
        }

        return 0;
}

static int cfg80211_wext_siwencode(struct net_device *dev,
                                   struct iw_request_info *info,
                                   union iwreq_data *wrqu, char *keybuf)
{
        struct iw_point *erq = &wrqu->encoding;
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        struct key_params params;
        bool remove = false;
        int idx;

        if (wdev->iftype != NL80211_IFTYPE_STATION &&
            wdev->iftype != NL80211_IFTYPE_ADHOC)
                return -EOPNOTSUPP;

        /* no use -- only MFP (set_default_mgmt_key) is optional */
        if (!rdev->ops->del_key ||
            !rdev->ops->add_key ||
            !rdev->ops->set_default_key)
                return -EOPNOTSUPP;

        guard(wiphy)(&rdev->wiphy);
        if (wdev->valid_links)
                return -EOPNOTSUPP;

        idx = erq->flags & IW_ENCODE_INDEX;
        if (idx == 0) {
                idx = wdev->wext.default_key;
                if (idx < 0)
                        idx = 0;
        } else if (idx < 1 || idx > 4) {
                return -EINVAL;
        } else {
                idx--;
        }

        if (erq->flags & IW_ENCODE_DISABLED)
                remove = true;
        else if (erq->length == 0) {
                /* No key data - just set the default TX key index */
                int err = 0;

                if (wdev->connected ||
                    (wdev->iftype == NL80211_IFTYPE_ADHOC &&
                     wdev->u.ibss.current_bss))
                        err = rdev_set_default_key(rdev, dev, -1, idx, true,
                                                   true);
                if (!err)
                        wdev->wext.default_key = idx;
                return err;
        }

        memset(&params, 0, sizeof(params));
        params.key = keybuf;
        params.key_len = erq->length;
        if (erq->length == 5)
                params.cipher = WLAN_CIPHER_SUITE_WEP40;
        else if (erq->length == 13)
                params.cipher = WLAN_CIPHER_SUITE_WEP104;
        else if (!remove)
                return -EINVAL;

        return cfg80211_set_encryption(rdev, dev, false, NULL, remove,
                                       wdev->wext.default_key == -1,
                                       idx, &params);
}

static int cfg80211_wext_siwencodeext(struct net_device *dev,
                                      struct iw_request_info *info,
                                      union iwreq_data *wrqu, char *extra)
{
        struct iw_point *erq = &wrqu->encoding;
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        struct iw_encode_ext *ext = (struct iw_encode_ext *) extra;
        const u8 *addr;
        int idx;
        bool remove = false;
        struct key_params params;
        u32 cipher;

        if (wdev->iftype != NL80211_IFTYPE_STATION &&
            wdev->iftype != NL80211_IFTYPE_ADHOC)
                return -EOPNOTSUPP;

        /* no use -- only MFP (set_default_mgmt_key) is optional */
        if (!rdev->ops->del_key ||
            !rdev->ops->add_key ||
            !rdev->ops->set_default_key)
                return -EOPNOTSUPP;

        if (wdev->valid_links)
                return -EOPNOTSUPP;

        switch (ext->alg) {
        case IW_ENCODE_ALG_NONE:
                remove = true;
                cipher = 0;
                break;
        case IW_ENCODE_ALG_WEP:
                if (ext->key_len == 5)
                        cipher = WLAN_CIPHER_SUITE_WEP40;
                else if (ext->key_len == 13)
                        cipher = WLAN_CIPHER_SUITE_WEP104;
                else
                        return -EINVAL;
                break;
        case IW_ENCODE_ALG_TKIP:
                cipher = WLAN_CIPHER_SUITE_TKIP;
                break;
        case IW_ENCODE_ALG_CCMP:
                cipher = WLAN_CIPHER_SUITE_CCMP;
                break;
        case IW_ENCODE_ALG_AES_CMAC:
                cipher = WLAN_CIPHER_SUITE_AES_CMAC;
                break;
        default:
                return -EOPNOTSUPP;
        }

        if (erq->flags & IW_ENCODE_DISABLED)
                remove = true;

        idx = erq->flags & IW_ENCODE_INDEX;
        if (cipher == WLAN_CIPHER_SUITE_AES_CMAC) {
                if (idx < 5 || idx > 6) {
                        idx = wdev->wext.default_mgmt_key;
                        if (idx < 0)
                                return -EINVAL;
                } else
                        idx--;
        } else {
                if (idx < 1 || idx > 4) {
                        idx = wdev->wext.default_key;
                        if (idx < 0)
                                return -EINVAL;
                } else
                        idx--;
        }

        addr = ext->addr.sa_data;
        if (is_broadcast_ether_addr(addr))
                addr = NULL;

        memset(&params, 0, sizeof(params));
        params.key = ext->key;
        params.key_len = ext->key_len;
        params.cipher = cipher;

        if (ext->ext_flags & IW_ENCODE_EXT_RX_SEQ_VALID) {
                params.seq = ext->rx_seq;
                params.seq_len = 6;
        }

        guard(wiphy)(wdev->wiphy);

        return cfg80211_set_encryption(rdev, dev,
                                       !(ext->ext_flags & IW_ENCODE_EXT_GROUP_KEY),
                                       addr, remove,
                                       ext->ext_flags & IW_ENCODE_EXT_SET_TX_KEY,
                                       idx, &params);
}

static int cfg80211_wext_giwencode(struct net_device *dev,
                                   struct iw_request_info *info,
                                   union iwreq_data *wrqu, char *keybuf)
{
        struct iw_point *erq = &wrqu->encoding;
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        int idx;

        if (wdev->iftype != NL80211_IFTYPE_STATION &&
            wdev->iftype != NL80211_IFTYPE_ADHOC)
                return -EOPNOTSUPP;

        idx = erq->flags & IW_ENCODE_INDEX;
        if (idx == 0) {
                idx = wdev->wext.default_key;
                if (idx < 0)
                        idx = 0;
        } else if (idx < 1 || idx > 4)
                return -EINVAL;
        else
                idx--;

        erq->flags = idx + 1;

        if (!wdev->wext.keys || !wdev->wext.keys->params[idx].cipher) {
                erq->flags |= IW_ENCODE_DISABLED;
                erq->length = 0;
                return 0;
        }

        erq->length = min_t(size_t, erq->length,
                            wdev->wext.keys->params[idx].key_len);
        memcpy(keybuf, wdev->wext.keys->params[idx].key, erq->length);
        erq->flags |= IW_ENCODE_ENABLED;

        return 0;
}

static int cfg80211_wext_siwfreq(struct net_device *dev,
                                 struct iw_request_info *info,
                                 union iwreq_data *wrqu, char *extra)
{
        struct iw_freq *wextfreq = &wrqu->freq;
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        struct cfg80211_chan_def chandef = {
                .width = NL80211_CHAN_WIDTH_20_NOHT,
        };
        int freq;

        guard(wiphy)(&rdev->wiphy);

        switch (wdev->iftype) {
        case NL80211_IFTYPE_STATION:
                return cfg80211_mgd_wext_siwfreq(dev, info, wextfreq, extra);
        case NL80211_IFTYPE_ADHOC:
                return cfg80211_ibss_wext_siwfreq(dev, info, wextfreq, extra);
        case NL80211_IFTYPE_MONITOR:
                freq = cfg80211_wext_freq(wextfreq);
                if (freq < 0)
                        return freq;
                if (freq == 0)
                        return -EINVAL;

                chandef.center_freq1 = freq;
                chandef.chan = ieee80211_get_channel(&rdev->wiphy, freq);
                if (!chandef.chan)
                        return -EINVAL;
                return cfg80211_set_monitor_channel(rdev, dev, &chandef);
        case NL80211_IFTYPE_MESH_POINT:
                freq = cfg80211_wext_freq(wextfreq);
                if (freq < 0)
                        return freq;
                if (freq == 0)
                        return -EINVAL;
                chandef.center_freq1 = freq;
                chandef.chan = ieee80211_get_channel(&rdev->wiphy, freq);
                if (!chandef.chan)
                        return -EINVAL;
                return cfg80211_set_mesh_channel(rdev, wdev, &chandef);
        default:
                return -EOPNOTSUPP;
        }
}

static int cfg80211_wext_giwfreq(struct net_device *dev,
                                 struct iw_request_info *info,
                                 union iwreq_data *wrqu, char *extra)
{
        struct iw_freq *freq = &wrqu->freq;
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        struct cfg80211_chan_def chandef = {};
        int ret;

        guard(wiphy)(&rdev->wiphy);

        switch (wdev->iftype) {
        case NL80211_IFTYPE_STATION:
                return cfg80211_mgd_wext_giwfreq(dev, info, freq, extra);
        case NL80211_IFTYPE_ADHOC:
                return cfg80211_ibss_wext_giwfreq(dev, info, freq, extra);
        case NL80211_IFTYPE_MONITOR:
                if (!rdev->ops->get_channel)
                        return -EINVAL;

                ret = rdev_get_channel(rdev, wdev, 0, &chandef);
                if (ret)
                        return ret;
                freq->m = chandef.chan->center_freq;
                freq->e = 6;
                return ret;
        default:
                return -EINVAL;
        }
}

static int cfg80211_wext_siwtxpower(struct net_device *dev,
                                    struct iw_request_info *info,
                                    union iwreq_data *data, char *extra)
{
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        enum nl80211_tx_power_setting type;
        int dbm = 0;

        if ((data->txpower.flags & IW_TXPOW_TYPE) != IW_TXPOW_DBM)
                return -EINVAL;
        if (data->txpower.flags & IW_TXPOW_RANGE)
                return -EINVAL;

        if (!rdev->ops->set_tx_power)
                return -EOPNOTSUPP;

        /* only change when not disabling */
        if (!data->txpower.disabled) {
                rfkill_set_sw_state(rdev->wiphy.rfkill, false);

                if (data->txpower.fixed) {
                        /*
                         * wext doesn't support negative values, see
                         * below where it's for automatic
                         */
                        if (data->txpower.value < 0)
                                return -EINVAL;
                        dbm = data->txpower.value;
                        type = NL80211_TX_POWER_FIXED;
                        /* TODO: do regulatory check! */
                } else {
                        /*
                         * Automatic power level setting, max being the value
                         * passed in from userland.
                         */
                        if (data->txpower.value < 0) {
                                type = NL80211_TX_POWER_AUTOMATIC;
                        } else {
                                dbm = data->txpower.value;
                                type = NL80211_TX_POWER_LIMITED;
                        }
                }
        } else {
                if (rfkill_set_sw_state(rdev->wiphy.rfkill, true))
                        schedule_work(&rdev->rfkill_block);
                return 0;
        }

        guard(wiphy)(&rdev->wiphy);

        return rdev_set_tx_power(rdev, wdev, -1, type, DBM_TO_MBM(dbm));
}

static int cfg80211_wext_giwtxpower(struct net_device *dev,
                                    struct iw_request_info *info,
                                    union iwreq_data *data, char *extra)
{
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        int err, val;

        if ((data->txpower.flags & IW_TXPOW_TYPE) != IW_TXPOW_DBM)
                return -EINVAL;
        if (data->txpower.flags & IW_TXPOW_RANGE)
                return -EINVAL;

        if (!rdev->ops->get_tx_power)
                return -EOPNOTSUPP;

        scoped_guard(wiphy, &rdev->wiphy) {
                err = rdev_get_tx_power(rdev, wdev, -1, 0, &val);
        }
        if (err)
                return err;

        /* well... oh well */
        data->txpower.fixed = 1;
        data->txpower.disabled = rfkill_blocked(rdev->wiphy.rfkill);
        data->txpower.value = val;
        data->txpower.flags = IW_TXPOW_DBM;

        return 0;
}

static int cfg80211_set_auth_alg(struct wireless_dev *wdev,
                                 s32 auth_alg)
{
        int nr_alg = 0;

        if (!auth_alg)
                return -EINVAL;

        if (auth_alg & ~(IW_AUTH_ALG_OPEN_SYSTEM |
                         IW_AUTH_ALG_SHARED_KEY |
                         IW_AUTH_ALG_LEAP))
                return -EINVAL;

        if (auth_alg & IW_AUTH_ALG_OPEN_SYSTEM) {
                nr_alg++;
                wdev->wext.connect.auth_type = NL80211_AUTHTYPE_OPEN_SYSTEM;
        }

        if (auth_alg & IW_AUTH_ALG_SHARED_KEY) {
                nr_alg++;
                wdev->wext.connect.auth_type = NL80211_AUTHTYPE_SHARED_KEY;
        }

        if (auth_alg & IW_AUTH_ALG_LEAP) {
                nr_alg++;
                wdev->wext.connect.auth_type = NL80211_AUTHTYPE_NETWORK_EAP;
        }

        if (nr_alg > 1)
                wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;

        return 0;
}

static int cfg80211_set_wpa_version(struct wireless_dev *wdev, u32 wpa_versions)
{
        if (wpa_versions & ~(IW_AUTH_WPA_VERSION_WPA |
                             IW_AUTH_WPA_VERSION_WPA2|
                             IW_AUTH_WPA_VERSION_DISABLED))
                return -EINVAL;

        if ((wpa_versions & IW_AUTH_WPA_VERSION_DISABLED) &&
            (wpa_versions & (IW_AUTH_WPA_VERSION_WPA|
                             IW_AUTH_WPA_VERSION_WPA2)))
                return -EINVAL;

        if (wpa_versions & IW_AUTH_WPA_VERSION_DISABLED)
                wdev->wext.connect.crypto.wpa_versions &=
                        ~(NL80211_WPA_VERSION_1|NL80211_WPA_VERSION_2);

        if (wpa_versions & IW_AUTH_WPA_VERSION_WPA)
                wdev->wext.connect.crypto.wpa_versions |=
                        NL80211_WPA_VERSION_1;

        if (wpa_versions & IW_AUTH_WPA_VERSION_WPA2)
                wdev->wext.connect.crypto.wpa_versions |=
                        NL80211_WPA_VERSION_2;

        return 0;
}

static int cfg80211_set_cipher_group(struct wireless_dev *wdev, u32 cipher)
{
        if (cipher & IW_AUTH_CIPHER_WEP40)
                wdev->wext.connect.crypto.cipher_group =
                        WLAN_CIPHER_SUITE_WEP40;
        else if (cipher & IW_AUTH_CIPHER_WEP104)
                wdev->wext.connect.crypto.cipher_group =
                        WLAN_CIPHER_SUITE_WEP104;
        else if (cipher & IW_AUTH_CIPHER_TKIP)
                wdev->wext.connect.crypto.cipher_group =
                        WLAN_CIPHER_SUITE_TKIP;
        else if (cipher & IW_AUTH_CIPHER_CCMP)
                wdev->wext.connect.crypto.cipher_group =
                        WLAN_CIPHER_SUITE_CCMP;
        else if (cipher & IW_AUTH_CIPHER_AES_CMAC)
                wdev->wext.connect.crypto.cipher_group =
                        WLAN_CIPHER_SUITE_AES_CMAC;
        else if (cipher & IW_AUTH_CIPHER_NONE)
                wdev->wext.connect.crypto.cipher_group = 0;
        else
                return -EINVAL;

        return 0;
}

static int cfg80211_set_cipher_pairwise(struct wireless_dev *wdev, u32 cipher)
{
        int nr_ciphers = 0;
        u32 *ciphers_pairwise = wdev->wext.connect.crypto.ciphers_pairwise;

        if (cipher & IW_AUTH_CIPHER_WEP40) {
                ciphers_pairwise[nr_ciphers] = WLAN_CIPHER_SUITE_WEP40;
                nr_ciphers++;
        }

        if (cipher & IW_AUTH_CIPHER_WEP104) {
                ciphers_pairwise[nr_ciphers] = WLAN_CIPHER_SUITE_WEP104;
                nr_ciphers++;
        }

        if (cipher & IW_AUTH_CIPHER_TKIP) {
                ciphers_pairwise[nr_ciphers] = WLAN_CIPHER_SUITE_TKIP;
                nr_ciphers++;
        }

        if (cipher & IW_AUTH_CIPHER_CCMP) {
                ciphers_pairwise[nr_ciphers] = WLAN_CIPHER_SUITE_CCMP;
                nr_ciphers++;
        }

        if (cipher & IW_AUTH_CIPHER_AES_CMAC) {
                ciphers_pairwise[nr_ciphers] = WLAN_CIPHER_SUITE_AES_CMAC;
                nr_ciphers++;
        }

        BUILD_BUG_ON(NL80211_MAX_NR_CIPHER_SUITES < 5);

        wdev->wext.connect.crypto.n_ciphers_pairwise = nr_ciphers;

        return 0;
}


static int cfg80211_set_key_mgt(struct wireless_dev *wdev, u32 key_mgt)
{
        int nr_akm_suites = 0;

        if (key_mgt & ~(IW_AUTH_KEY_MGMT_802_1X |
                        IW_AUTH_KEY_MGMT_PSK))
                return -EINVAL;

        if (key_mgt & IW_AUTH_KEY_MGMT_802_1X) {
                wdev->wext.connect.crypto.akm_suites[nr_akm_suites] =
                        WLAN_AKM_SUITE_8021X;
                nr_akm_suites++;
        }

        if (key_mgt & IW_AUTH_KEY_MGMT_PSK) {
                wdev->wext.connect.crypto.akm_suites[nr_akm_suites] =
                        WLAN_AKM_SUITE_PSK;
                nr_akm_suites++;
        }

        wdev->wext.connect.crypto.n_akm_suites = nr_akm_suites;

        return 0;
}

static int cfg80211_wext_siwauth(struct net_device *dev,
                                 struct iw_request_info *info,
                                 union iwreq_data *wrqu, char *extra)
{
        struct iw_param *data = &wrqu->param;
        struct wireless_dev *wdev = dev->ieee80211_ptr;

        if (wdev->iftype != NL80211_IFTYPE_STATION)
                return -EOPNOTSUPP;

        switch (data->flags & IW_AUTH_INDEX) {
        case IW_AUTH_PRIVACY_INVOKED:
                wdev->wext.connect.privacy = data->value;
                return 0;
        case IW_AUTH_WPA_VERSION:
                return cfg80211_set_wpa_version(wdev, data->value);
        case IW_AUTH_CIPHER_GROUP:
                return cfg80211_set_cipher_group(wdev, data->value);
        case IW_AUTH_KEY_MGMT:
                return cfg80211_set_key_mgt(wdev, data->value);
        case IW_AUTH_CIPHER_PAIRWISE:
                return cfg80211_set_cipher_pairwise(wdev, data->value);
        case IW_AUTH_80211_AUTH_ALG:
                return cfg80211_set_auth_alg(wdev, data->value);
        case IW_AUTH_WPA_ENABLED:
        case IW_AUTH_RX_UNENCRYPTED_EAPOL:
        case IW_AUTH_DROP_UNENCRYPTED:
        case IW_AUTH_MFP:
                return 0;
        default:
                return -EOPNOTSUPP;
        }
}

static int cfg80211_wext_giwauth(struct net_device *dev,
                                 struct iw_request_info *info,
                                 union iwreq_data *wrqu, char *extra)
{
        /* XXX: what do we need? */

        return -EOPNOTSUPP;
}

static int cfg80211_wext_siwpower(struct net_device *dev,
                                  struct iw_request_info *info,
                                  union iwreq_data *wrqu, char *extra)
{
        struct iw_param *wrq = &wrqu->power;
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        bool ps;
        int timeout = wdev->ps_timeout;
        int err;

        if (wdev->iftype != NL80211_IFTYPE_STATION)
                return -EINVAL;

        if (!rdev->ops->set_power_mgmt)
                return -EOPNOTSUPP;

        if (wrq->disabled) {
                ps = false;
        } else {
                switch (wrq->flags & IW_POWER_MODE) {
                case IW_POWER_ON:       /* If not specified */
                case IW_POWER_MODE:     /* If set all mask */
                case IW_POWER_ALL_R:    /* If explicitly state all */
                        ps = true;
                        break;
                default:                /* Otherwise we ignore */
                        return -EINVAL;
                }

                if (wrq->flags & ~(IW_POWER_MODE | IW_POWER_TIMEOUT))
                        return -EINVAL;

                if (wrq->flags & IW_POWER_TIMEOUT)
                        timeout = wrq->value / 1000;
        }

        guard(wiphy)(&rdev->wiphy);

        err = rdev_set_power_mgmt(rdev, dev, ps, timeout);
        if (err)
                return err;

        wdev->ps = ps;
        wdev->ps_timeout = timeout;

        return 0;

}

static int cfg80211_wext_giwpower(struct net_device *dev,
                                  struct iw_request_info *info,
                                  union iwreq_data *wrqu, char *extra)
{
        struct iw_param *wrq = &wrqu->power;
        struct wireless_dev *wdev = dev->ieee80211_ptr;

        wrq->disabled = !wdev->ps;

        return 0;
}

static int cfg80211_wext_siwrate(struct net_device *dev,
                                 struct iw_request_info *info,
                                 union iwreq_data *wrqu, char *extra)
{
        struct iw_param *rate = &wrqu->bitrate;
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        struct cfg80211_bitrate_mask mask;
        u32 fixed, maxrate;
        struct ieee80211_supported_band *sband;
        bool match = false;
        int band, ridx;

        if (!rdev->ops->set_bitrate_mask)
                return -EOPNOTSUPP;

        memset(&mask, 0, sizeof(mask));
        fixed = 0;
        maxrate = (u32)-1;

        if (rate->value < 0) {
                /* nothing */
        } else if (rate->fixed) {
                fixed = rate->value / 100000;
        } else {
                maxrate = rate->value / 100000;
        }

        for (band = 0; band < NUM_NL80211_BANDS; band++) {
                sband = wdev->wiphy->bands[band];
                if (sband == NULL)
                        continue;
                for (ridx = 0; ridx < sband->n_bitrates; ridx++) {
                        struct ieee80211_rate *srate = &sband->bitrates[ridx];
                        if (fixed == srate->bitrate) {
                                mask.control[band].legacy = 1 << ridx;
                                match = true;
                                break;
                        }
                        if (srate->bitrate <= maxrate) {
                                mask.control[band].legacy |= 1 << ridx;
                                match = true;
                        }
                }
        }

        if (!match)
                return -EINVAL;

        guard(wiphy)(&rdev->wiphy);

        if (dev->ieee80211_ptr->valid_links)
                return -EOPNOTSUPP;
        
        return rdev_set_bitrate_mask(rdev, dev, 0, NULL, &mask);
}

static int cfg80211_wext_giwrate(struct net_device *dev,
                                 struct iw_request_info *info,
                                 union iwreq_data *wrqu, char *extra)
{
        struct iw_param *rate = &wrqu->bitrate;
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        struct station_info sinfo = {};
        u8 addr[ETH_ALEN];
        int err;

        if (wdev->iftype != NL80211_IFTYPE_STATION)
                return -EOPNOTSUPP;

        if (!rdev->ops->get_station)
                return -EOPNOTSUPP;

        err = 0;
        if (!wdev->valid_links && wdev->links[0].client.current_bss)
                memcpy(addr, wdev->links[0].client.current_bss->pub.bssid,
                       ETH_ALEN);
        else
                err = -EOPNOTSUPP;
        if (err)
                return err;

        scoped_guard(wiphy, &rdev->wiphy) {
                err = rdev_get_station(rdev, dev, addr, &sinfo);
        }
        if (err)
                return err;

        if (!(sinfo.filled & BIT_ULL(NL80211_STA_INFO_TX_BITRATE))) {
                err = -EOPNOTSUPP;
                goto free;
        }

        rate->value = 100000 * cfg80211_calculate_bitrate(&sinfo.txrate);

free:
        cfg80211_sinfo_release_content(&sinfo);
        return err;
}

/* Get wireless statistics.  Called by /proc/net/wireless and by SIOCGIWSTATS */
static struct iw_statistics *cfg80211_wireless_stats(struct net_device *dev)
{
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        /* we are under RTNL - globally locked - so can use static structs */
        static struct iw_statistics wstats;
        static struct station_info sinfo = {};
        u8 bssid[ETH_ALEN];
        int ret;

        if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_STATION)
                return NULL;

        if (!rdev->ops->get_station)
                return NULL;

        /* Grab BSSID of current BSS, if any */
        wiphy_lock(&rdev->wiphy);
        if (wdev->valid_links || !wdev->links[0].client.current_bss) {
                wiphy_unlock(&rdev->wiphy);
                return NULL;
        }
        memcpy(bssid, wdev->links[0].client.current_bss->pub.bssid, ETH_ALEN);

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

        ret = rdev_get_station(rdev, dev, bssid, &sinfo);
        wiphy_unlock(&rdev->wiphy);

        if (ret)
                return NULL;

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

        switch (rdev->wiphy.signal_type) {
        case CFG80211_SIGNAL_TYPE_MBM:
                if (sinfo.filled & BIT_ULL(NL80211_STA_INFO_SIGNAL)) {
                        int sig = sinfo.signal;
                        wstats.qual.updated |= IW_QUAL_LEVEL_UPDATED;
                        wstats.qual.updated |= IW_QUAL_QUAL_UPDATED;
                        wstats.qual.updated |= IW_QUAL_DBM;
                        wstats.qual.level = sig;
                        if (sig < -110)
                                sig = -110;
                        else if (sig > -40)
                                sig = -40;
                        wstats.qual.qual = sig + 110;
                        break;
                }
                fallthrough;
        case CFG80211_SIGNAL_TYPE_UNSPEC:
                if (sinfo.filled & BIT_ULL(NL80211_STA_INFO_SIGNAL)) {
                        wstats.qual.updated |= IW_QUAL_LEVEL_UPDATED;
                        wstats.qual.updated |= IW_QUAL_QUAL_UPDATED;
                        wstats.qual.level = sinfo.signal;
                        wstats.qual.qual = sinfo.signal;
                        break;
                }
                fallthrough;
        default:
                wstats.qual.updated |= IW_QUAL_LEVEL_INVALID;
                wstats.qual.updated |= IW_QUAL_QUAL_INVALID;
        }

        wstats.qual.updated |= IW_QUAL_NOISE_INVALID;
        if (sinfo.filled & BIT_ULL(NL80211_STA_INFO_RX_DROP_MISC))
                wstats.discard.misc = sinfo.rx_dropped_misc;
        if (sinfo.filled & BIT_ULL(NL80211_STA_INFO_TX_FAILED))
                wstats.discard.retries = sinfo.tx_failed;

        cfg80211_sinfo_release_content(&sinfo);

        return &wstats;
}

static int cfg80211_wext_siwap(struct net_device *dev,
                               struct iw_request_info *info,
                               union iwreq_data *wrqu, char *extra)
{
        struct sockaddr *ap_addr = &wrqu->ap_addr;
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);

        guard(wiphy)(&rdev->wiphy);

        switch (wdev->iftype) {
        case NL80211_IFTYPE_ADHOC:
                return cfg80211_ibss_wext_siwap(dev, info, ap_addr, extra);
        case NL80211_IFTYPE_STATION:
                return cfg80211_mgd_wext_siwap(dev, info, ap_addr, extra);
        default:
                return -EOPNOTSUPP;
        }
}

static int cfg80211_wext_giwap(struct net_device *dev,
                               struct iw_request_info *info,
                               union iwreq_data *wrqu, char *extra)
{
        struct sockaddr *ap_addr = &wrqu->ap_addr;
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);

        guard(wiphy)(&rdev->wiphy);

        switch (wdev->iftype) {
        case NL80211_IFTYPE_ADHOC:
                return cfg80211_ibss_wext_giwap(dev, info, ap_addr, extra);
        case NL80211_IFTYPE_STATION:
                return cfg80211_mgd_wext_giwap(dev, info, ap_addr, extra);
        default:
                return -EOPNOTSUPP;
        }
}

static int cfg80211_wext_siwessid(struct net_device *dev,
                                  struct iw_request_info *info,
                                  union iwreq_data *wrqu, char *ssid)
{
        struct iw_point *data = &wrqu->data;
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);

        guard(wiphy)(&rdev->wiphy);

        switch (wdev->iftype) {
        case NL80211_IFTYPE_ADHOC:
                return cfg80211_ibss_wext_siwessid(dev, info, data, ssid);
        case NL80211_IFTYPE_STATION:
                return cfg80211_mgd_wext_siwessid(dev, info, data, ssid);
        default:
                return -EOPNOTSUPP;
        }
}

static int cfg80211_wext_giwessid(struct net_device *dev,
                                  struct iw_request_info *info,
                                  union iwreq_data *wrqu, char *ssid)
{
        struct iw_point *data = &wrqu->data;
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);

        data->flags = 0;
        data->length = 0;

        guard(wiphy)(&rdev->wiphy);

        switch (wdev->iftype) {
        case NL80211_IFTYPE_ADHOC:
                return cfg80211_ibss_wext_giwessid(dev, info, data, ssid);
        case NL80211_IFTYPE_STATION:
                return cfg80211_mgd_wext_giwessid(dev, info, data, ssid);
        default:
                return -EOPNOTSUPP;
        }
}

static int cfg80211_wext_siwpmksa(struct net_device *dev,
                                  struct iw_request_info *info,
                                  union iwreq_data *wrqu, char *extra)
{
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        struct cfg80211_pmksa cfg_pmksa;
        struct iw_pmksa *pmksa = (struct iw_pmksa *)extra;

        memset(&cfg_pmksa, 0, sizeof(struct cfg80211_pmksa));

        if (wdev->iftype != NL80211_IFTYPE_STATION)
                return -EINVAL;

        cfg_pmksa.bssid = pmksa->bssid.sa_data;
        cfg_pmksa.pmkid = pmksa->pmkid;

        guard(wiphy)(&rdev->wiphy);

        switch (pmksa->cmd) {
        case IW_PMKSA_ADD:
                if (!rdev->ops->set_pmksa)
                        return -EOPNOTSUPP;

                return rdev_set_pmksa(rdev, dev, &cfg_pmksa);
        case IW_PMKSA_REMOVE:
                if (!rdev->ops->del_pmksa)
                        return -EOPNOTSUPP;

                return rdev_del_pmksa(rdev, dev, &cfg_pmksa);
        case IW_PMKSA_FLUSH:
                if (!rdev->ops->flush_pmksa)
                        return -EOPNOTSUPP;

                return rdev_flush_pmksa(rdev, dev);
        default:
                return -EOPNOTSUPP;
        }
}

static const iw_handler cfg80211_handlers[] = {
        IW_HANDLER(SIOCGIWNAME,         cfg80211_wext_giwname),
        IW_HANDLER(SIOCSIWFREQ,         cfg80211_wext_siwfreq),
        IW_HANDLER(SIOCGIWFREQ,         cfg80211_wext_giwfreq),
        IW_HANDLER(SIOCSIWMODE,         cfg80211_wext_siwmode),
        IW_HANDLER(SIOCGIWMODE,         cfg80211_wext_giwmode),
        IW_HANDLER(SIOCGIWRANGE,        cfg80211_wext_giwrange),
        IW_HANDLER(SIOCSIWAP,           cfg80211_wext_siwap),
        IW_HANDLER(SIOCGIWAP,           cfg80211_wext_giwap),
        IW_HANDLER(SIOCSIWMLME,         cfg80211_wext_siwmlme),
        IW_HANDLER(SIOCSIWSCAN,         cfg80211_wext_siwscan),
        IW_HANDLER(SIOCGIWSCAN,         cfg80211_wext_giwscan),
        IW_HANDLER(SIOCSIWESSID,        cfg80211_wext_siwessid),
        IW_HANDLER(SIOCGIWESSID,        cfg80211_wext_giwessid),
        IW_HANDLER(SIOCSIWRATE,         cfg80211_wext_siwrate),
        IW_HANDLER(SIOCGIWRATE,         cfg80211_wext_giwrate),
        IW_HANDLER(SIOCSIWRTS,          cfg80211_wext_siwrts),
        IW_HANDLER(SIOCGIWRTS,          cfg80211_wext_giwrts),
        IW_HANDLER(SIOCSIWFRAG,         cfg80211_wext_siwfrag),
        IW_HANDLER(SIOCGIWFRAG,         cfg80211_wext_giwfrag),
        IW_HANDLER(SIOCSIWTXPOW,        cfg80211_wext_siwtxpower),
        IW_HANDLER(SIOCGIWTXPOW,        cfg80211_wext_giwtxpower),
        IW_HANDLER(SIOCSIWRETRY,        cfg80211_wext_siwretry),
        IW_HANDLER(SIOCGIWRETRY,        cfg80211_wext_giwretry),
        IW_HANDLER(SIOCSIWENCODE,       cfg80211_wext_siwencode),
        IW_HANDLER(SIOCGIWENCODE,       cfg80211_wext_giwencode),
        IW_HANDLER(SIOCSIWPOWER,        cfg80211_wext_siwpower),
        IW_HANDLER(SIOCGIWPOWER,        cfg80211_wext_giwpower),
        IW_HANDLER(SIOCSIWGENIE,        cfg80211_wext_siwgenie),
        IW_HANDLER(SIOCSIWAUTH,         cfg80211_wext_siwauth),
        IW_HANDLER(SIOCGIWAUTH,         cfg80211_wext_giwauth),
        IW_HANDLER(SIOCSIWENCODEEXT,    cfg80211_wext_siwencodeext),
        IW_HANDLER(SIOCSIWPMKSA,        cfg80211_wext_siwpmksa),
};

const struct iw_handler_def cfg80211_wext_handler = {
        .num_standard           = ARRAY_SIZE(cfg80211_handlers),
        .standard               = cfg80211_handlers,
        .get_wireless_stats = cfg80211_wireless_stats,
};