Merge tag 'wireless-drivers-next-2020-03-24' of git://git.kernel.org/pub/scm/linux...

[linux-2.6-microblaze.git] / net / mac80211 / mlme.c

// 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 - 2020 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 <asm/unaligned.h>

#include "ieee80211_i.h"
#include "driver-ops.h"
#include "rate.h"
#include "led.h"
#include "fils_aead.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_ASSOC_TIMEOUT         (HZ / 5)
#define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
#define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
#define IEEE80211_ASSOC_MAX_TRIES       3

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)
{
        sdata_assert_lock(sdata);

        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 u32
ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
                             struct ieee80211_supported_band *sband,
                             struct ieee80211_channel *channel,
                             const struct ieee80211_ht_operation *ht_oper,
                             const struct ieee80211_vht_operation *vht_oper,
                             const struct ieee80211_he_operation *he_oper,
                             struct cfg80211_chan_def *chandef, bool tracking)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct cfg80211_chan_def vht_chandef;
        struct ieee80211_sta_ht_cap sta_ht_cap;
        u32 ht_cfreq, ret;

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

        memset(chandef, 0, sizeof(struct cfg80211_chan_def));
        chandef->chan = channel;
        chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
        chandef->center_freq1 = channel->center_freq;

        if (!ht_oper || !sta_ht_cap.ht_supported) {
                ret = IEEE80211_STA_DISABLE_HT |
                      IEEE80211_STA_DISABLE_VHT |
                      IEEE80211_STA_DISABLE_HE;
                goto out;
        }

        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 (!tracking && 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);
                ret = IEEE80211_STA_DISABLE_HT |
                      IEEE80211_STA_DISABLE_VHT |
                      IEEE80211_STA_DISABLE_HE;
                goto out;
        }

        /* check 40 MHz support, if we have it */
        if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
                ieee80211_chandef_ht_oper(ht_oper, chandef);
        } else {
                /* 40 MHz (and 80 MHz) must be supported for VHT */
                ret = IEEE80211_STA_DISABLE_VHT;
                /* also mark 40 MHz disabled */
                ret |= IEEE80211_STA_DISABLE_40MHZ;
                goto out;
        }

        if (!vht_oper || !sband->vht_cap.vht_supported) {
                ret = IEEE80211_STA_DISABLE_VHT;
                goto out;
        }

        vht_chandef = *chandef;
        if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HE) && he_oper &&
            (le32_to_cpu(he_oper->he_oper_params) &
             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,
                                                &he_oper_vht_cap, ht_oper,
                                                &vht_chandef)) {
                        if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HE))
                                sdata_info(sdata,
                                           "HE AP VHT information is invalid, disable HE\n");
                        ret = IEEE80211_STA_DISABLE_HE;
                        goto out;
                }
        } else if (!ieee80211_chandef_vht_oper(&sdata->local->hw, vht_oper,
                                               ht_oper, &vht_chandef)) {
                if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
                        sdata_info(sdata,
                                   "AP VHT information is invalid, disable VHT\n");
                ret = IEEE80211_STA_DISABLE_VHT;
                goto out;
        }

        if (!cfg80211_chandef_valid(&vht_chandef)) {
                if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
                        sdata_info(sdata,
                                   "AP VHT information is invalid, disable VHT\n");
                ret = IEEE80211_STA_DISABLE_VHT;
                goto out;
        }

        if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
                ret = 0;
                goto out;
        }

        if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
                if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
                        sdata_info(sdata,
                                   "AP VHT information doesn't match HT, disable VHT\n");
                ret = IEEE80211_STA_DISABLE_VHT;
                goto out;
        }

        *chandef = vht_chandef;

        ret = 0;

out:
        /*
         * When tracking the current AP, don't do any further checks if the
         * new chandef is identical to the one we're currently using for the
         * connection. 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)
         *  - the code below detects an unsupported channel, downgrades, and
         *    we disconnect from the AP in the caller
         *  - 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.
         */
        if (tracking &&
            cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
                return ret;

        /* don't print the message below for VHT mismatch if VHT is disabled */
        if (ret & IEEE80211_STA_DISABLE_VHT)
                vht_chandef = *chandef;

        /*
         * Ignore the DISABLED flag when we're already connected and only
         * tracking the APs beacon for bandwidth changes - otherwise we
         * might get disconnected here if we connect to an AP, update our
         * regulatory information based on the AP's country IE and the
         * information we have is wrong/outdated and disables the channel
         * that we're actually using for the connection to the AP.
         */
        while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
                                        tracking ? 0 :
                                                   IEEE80211_CHAN_DISABLED)) {
                if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
                        ret = IEEE80211_STA_DISABLE_HT |
                              IEEE80211_STA_DISABLE_VHT |
                              IEEE80211_STA_DISABLE_HE;
                        break;
                }

                ret |= ieee80211_chandef_downgrade(chandef);
        }

        if (!he_oper || !cfg80211_chandef_usable(sdata->wdev.wiphy, chandef,
                                                 IEEE80211_CHAN_NO_HE))
                ret |= IEEE80211_STA_DISABLE_HE;

        if (chandef->width != vht_chandef.width && !tracking)
                sdata_info(sdata,
                           "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");

        WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
        return ret;
}

static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
                               struct sta_info *sta,
                               const struct ieee80211_ht_cap *ht_cap,
                               const struct ieee80211_ht_operation *ht_oper,
                               const struct ieee80211_vht_operation *vht_oper,
                               const struct ieee80211_he_operation *he_oper,
                               const u8 *bssid, u32 *changed)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct ieee80211_channel *chan = sdata->vif.bss_conf.chandef.chan;
        struct ieee80211_supported_band *sband =
                local->hw.wiphy->bands[chan->band];
        struct cfg80211_chan_def chandef;
        u16 ht_opmode;
        u32 flags;
        enum ieee80211_sta_rx_bandwidth new_sta_bw;
        int ret;

        /* if HT was/is disabled, don't track any bandwidth changes */
        if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
                return 0;

        /* don't check VHT if we associated as non-VHT station */
        if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
                vht_oper = NULL;

        /* don't check HE if we associated as non-HE station */
        if (ifmgd->flags & IEEE80211_STA_DISABLE_HE ||
            !ieee80211_get_he_sta_cap(sband))
                he_oper = NULL;

        if (WARN_ON_ONCE(!sta))
                return -EINVAL;

        /*
         * if bss configuration changed store the new one -
         * this may be applicable even if channel is identical
         */
        ht_opmode = le16_to_cpu(ht_oper->operation_mode);
        if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
                *changed |= BSS_CHANGED_HT;
                sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
        }

        /* calculate new channel (type) based on HT/VHT/HE operation IEs */
        flags = ieee80211_determine_chantype(sdata, sband, chan,
                                             ht_oper, vht_oper, he_oper,
                                             &chandef, true);

        /*
         * Downgrade the new channel if we associated with restricted
         * 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.
         */
        if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
            chandef.width == NL80211_CHAN_WIDTH_80P80)
                flags |= ieee80211_chandef_downgrade(&chandef);
        if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
            chandef.width == NL80211_CHAN_WIDTH_160)
                flags |= ieee80211_chandef_downgrade(&chandef);
        if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
            chandef.width > NL80211_CHAN_WIDTH_20)
                flags |= ieee80211_chandef_downgrade(&chandef);

        if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
                return 0;

        sdata_info(sdata,
                   "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
                   ifmgd->bssid, chandef.chan->center_freq, chandef.width,
                   chandef.center_freq1, chandef.center_freq2);

        if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
                                      IEEE80211_STA_DISABLE_VHT |
                                      IEEE80211_STA_DISABLE_HE |
                                      IEEE80211_STA_DISABLE_40MHZ |
                                      IEEE80211_STA_DISABLE_80P80MHZ |
                                      IEEE80211_STA_DISABLE_160MHZ)) ||
            !cfg80211_chandef_valid(&chandef)) {
                sdata_info(sdata,
                           "AP %pM changed bandwidth in a way we can't support - disconnect\n",
                           ifmgd->bssid);
                return -EINVAL;
        }

        switch (chandef.width) {
        case NL80211_CHAN_WIDTH_20_NOHT:
        case NL80211_CHAN_WIDTH_20:
                new_sta_bw = IEEE80211_STA_RX_BW_20;
                break;
        case NL80211_CHAN_WIDTH_40:
                new_sta_bw = IEEE80211_STA_RX_BW_40;
                break;
        case NL80211_CHAN_WIDTH_80:
                new_sta_bw = IEEE80211_STA_RX_BW_80;
                break;
        case NL80211_CHAN_WIDTH_80P80:
        case NL80211_CHAN_WIDTH_160:
                new_sta_bw = IEEE80211_STA_RX_BW_160;
                break;
        default:
                return -EINVAL;
        }

        if (new_sta_bw > sta->cur_max_bandwidth)
                new_sta_bw = sta->cur_max_bandwidth;

        if (new_sta_bw < sta->sta.bandwidth) {
                sta->sta.bandwidth = new_sta_bw;
                rate_control_rate_update(local, sband, sta,
                                         IEEE80211_RC_BW_CHANGED);
        }

        ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
        if (ret) {
                sdata_info(sdata,
                           "AP %pM changed bandwidth to incompatible one - disconnect\n",
                           ifmgd->bssid);
                return ret;
        }

        if (new_sta_bw > sta->sta.bandwidth) {
                sta->sta.bandwidth = new_sta_bw;
                rate_control_rate_update(local, sband, sta,
                                         IEEE80211_RC_BW_CHANGED);
        }

        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)
{
        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 (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
                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);
                /* fall through */
        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 may set the owner of the MU-MIMO capability
 */
static void 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)
{
        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;

        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 (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
                u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;

                cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
                if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
                    bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
                        cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
        }

        if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
                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 (!(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 capablity 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_rcu(other, &local->interfaces, list) {
                        if (other->vif.mu_mimo_owner) {
                                disable_mu_mimo = true;
                                break;
                        }
                }
                if (disable_mu_mimo)
                        cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
                else
                        sdata->vif.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);
}

/* This function determines HE capability flags for the association
 * and builds the IE.
 */
static void ieee80211_add_he_ie(struct ieee80211_sub_if_data *sdata,
                                struct sk_buff *skb,
                                struct ieee80211_supported_band *sband)
{
        u8 *pos;
        const struct ieee80211_sta_he_cap *he_cap = NULL;
        struct ieee80211_chanctx_conf *chanctx_conf;
        u8 he_cap_size;
        bool reg_cap = false;

        rcu_read_lock();
        chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
        if (!WARN_ON_ONCE(!chanctx_conf))
                reg_cap = cfg80211_chandef_usable(sdata->wdev.wiphy,
                                                  &chanctx_conf->def,
                                                  IEEE80211_CHAN_NO_HE);

        rcu_read_unlock();

        he_cap = ieee80211_get_he_sta_cap(sband);
        if (!he_cap || !reg_cap)
                return;

        /*
         * TODO: the 1 added is because this temporarily is under the EXTENSION
         * IE. Get rid of it when it moves.
         */
        he_cap_size =
                2 + 1 + sizeof(he_cap->he_cap_elem) +
                ieee80211_he_mcs_nss_size(&he_cap->he_cap_elem) +
                ieee80211_he_ppe_size(he_cap->ppe_thres[0],
                                      he_cap->he_cap_elem.phy_cap_info);
        pos = skb_put(skb, he_cap_size);
        ieee80211_ie_build_he_cap(pos, he_cap, pos + he_cap_size);
}

static void 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 sk_buff *skb;
        struct ieee80211_mgmt *mgmt;
        u8 *pos, qos_info, *ie_start;
        size_t offset = 0, noffset;
        int i, count, rates_len, supp_rates_len, shift;
        u16 capab;
        struct ieee80211_supported_band *sband;
        struct ieee80211_chanctx_conf *chanctx_conf;
        struct ieee80211_channel *chan;
        u32 rates = 0;
        struct element *ext_capa = NULL;

        /* 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);

        sdata_assert_lock(sdata);

        rcu_read_lock();
        chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
        if (WARN_ON(!chanctx_conf)) {
                rcu_read_unlock();
                return;
        }
        chan = chanctx_conf->def.chan;
        rcu_read_unlock();
        sband = local->hw.wiphy->bands[chan->band];
        shift = ieee80211_vif_get_shift(&sdata->vif);

        if (assoc_data->supp_rates_len) {
                /*
                 * 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)...
                 */
                rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, 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_len = 0;
                for (i = 0; i < sband->n_bitrates; i++) {
                        rates |= BIT(i);
                        rates_len++;
                }
        }

        skb = alloc_skb(local->hw.extra_tx_headroom +
                        sizeof(*mgmt) + /* bit too much but doesn't matter */
                        2 + assoc_data->ssid_len + /* SSID */
                        4 + rates_len + /* (extended) rates */
                        4 + /* power capability */
                        2 + 2 * sband->n_channels + /* supported channels */
                        2 + sizeof(struct ieee80211_ht_cap) + /* HT */
                        2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
                        2 + 1 + sizeof(struct ieee80211_he_cap_elem) + /* HE */
                                sizeof(struct ieee80211_he_mcs_nss_supp) +
                                IEEE80211_HE_PPE_THRES_MAX_LEN +
                        assoc_data->ie_len + /* extra IEs */
                        (assoc_data->fils_kek_len ? 16 /* AES-SIV */ : 0) +
                        9, /* WMM */
                        GFP_KERNEL);
        if (!skb)
                return;

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

        capab = WLAN_CAPABILITY_ESS;

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

        if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
                capab |= WLAN_CAPABILITY_PRIVACY;

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

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

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

        if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
                skb_put(skb, 10);
                mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                                                  IEEE80211_STYPE_REASSOC_REQ);
                mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
                mgmt->u.reassoc_req.listen_interval =
                                cpu_to_le16(local->hw.conf.listen_interval);
                memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
                       ETH_ALEN);
        } else {
                skb_put(skb, 4);
                mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                                                  IEEE80211_STYPE_ASSOC_REQ);
                mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
                mgmt->u.assoc_req.listen_interval =
                                cpu_to_le16(local->hw.conf.listen_interval);
        }

        /* 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);

        /* add all rates which were marked to be used above */
        supp_rates_len = rates_len;
        if (supp_rates_len > 8)
                supp_rates_len = 8;

        pos = skb_put(skb, supp_rates_len + 2);
        *pos++ = WLAN_EID_SUPP_RATES;
        *pos++ = supp_rates_len;

        count = 0;
        for (i = 0; i < sband->n_bitrates; i++) {
                if (BIT(i) & rates) {
                        int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
                                                5 * (1 << shift));
                        *pos++ = (u8) rate;
                        if (++count == 8)
                                break;
                }
        }

        if (rates_len > count) {
                pos = skb_put(skb, rates_len - count + 2);
                *pos++ = WLAN_EID_EXT_SUPP_RATES;
                *pos++ = rates_len - count;

                for (i++; i < sband->n_bitrates; i++) {
                        if (BIT(i) & rates) {
                                int rate;
                                rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
                                                    5 * (1 << shift));
                                *pos++ = (u8) rate;
                        }
                }
        }

        if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
            capab & WLAN_CAPABILITY_RADIO_MEASURE) {
                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(&chanctx_conf->def);
        }

        /*
         * 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++) {
                        *pos++ = ieee80211_frequency_to_channel(
                                        sband->channels[i].center_freq);
                        *pos++ = 1; /* one channel in the subband*/
                }
        }

        /* Set MBSSID support for HE AP if needed */
        if (ieee80211_hw_check(&local->hw, SUPPORTS_ONLY_HE_MULTI_BSSID) &&
            !(ifmgd->flags & IEEE80211_STA_DISABLE_HE) && assoc_data->ie_len &&
            ext_capa && ext_capa->datalen >= 3)
                ext_capa->data[2] |= WLAN_EXT_CAPA3_MULTI_BSSID_SUPPORT;

        /* if present, add any custom IEs that go before HT */
        if (assoc_data->ie_len) {
                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,
                };

                noffset = ieee80211_ie_split_ric(assoc_data->ie,
                                                 assoc_data->ie_len,
                                                 before_ht,
                                                 ARRAY_SIZE(before_ht),
                                                 after_ric,
                                                 ARRAY_SIZE(after_ric),
                                                 offset);
                skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
                offset = noffset;
        }

        if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
                         !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
                ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;

        if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
                ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
                                    sband, chan, sdata->smps_mode);

        /* if present, add any custom IEs that go before VHT */
        if (assoc_data->ie_len) {
                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 */
                };

                /* RIC already taken above, so no need to handle here anymore */
                noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
                                             before_vht, ARRAY_SIZE(before_vht),
                                             offset);
                skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
                offset = noffset;
        }

        /* if present, add any custom IEs that go before HE */
        if (assoc_data->ie_len) {
                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 */
                };

                /* RIC already taken above, so no need to handle here anymore */
                noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
                                             before_he, ARRAY_SIZE(before_he),
                                             offset);
                pos = skb_put(skb, noffset - offset);
                memcpy(pos, assoc_data->ie + offset, noffset - offset);
                offset = noffset;
        }

        if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
                ieee80211_add_vht_ie(sdata, skb, sband,
                                     &assoc_data->ap_vht_cap);

        /*
         * If AP doesn't support HT, mark HE as disabled.
         * If on the 5GHz band, make sure it supports VHT.
         */
        if (ifmgd->flags & IEEE80211_STA_DISABLE_HT ||
            (sband->band == NL80211_BAND_5GHZ &&
             ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
                ifmgd->flags |= IEEE80211_STA_DISABLE_HE;

        if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HE))
                ieee80211_add_he_ie(sdata, skb, sband);

        /* if present, add any custom non-vendor IEs that go after HE */
        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 &&
            fils_encrypt_assoc_req(skb, assoc_data) < 0) {
                dev_kfree_skb(skb);
                return;
        }

        pos = skb_tail_pointer(skb);
        kfree(ifmgd->assoc_req_ies);
        ifmgd->assoc_req_ies = kmemdup(ie_start, pos - ie_start, GFP_ATOMIC);
        ifmgd->assoc_req_ies_len = pos - ie_start;

        drv_mgd_prepare_tx(local, sdata, 0);

        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);
}

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;

        /* Don't send NDPs when STA is connected HE */
        if (sdata->vif.type == NL80211_IFTYPE_STATION &&
            !(ifmgd->flags & IEEE80211_STA_DISABLE_HE))
                return;

        skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif,
                !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);
}

static 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;

        /* Don't send NDPs when connected HE */
        if (!(sdata->u.mgd.flags & IEEE80211_STA_DISABLE_HE))
                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->u.mgd.bssid, ETH_ALEN);
        memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
        memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
        memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);

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

/* spectrum management related things */
static void ieee80211_chswitch_work(struct work_struct *work)
{
        struct ieee80211_sub_if_data *sdata =
                container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        int ret;

        if (!ieee80211_sdata_running(sdata))
                return;

        sdata_lock(sdata);
        mutex_lock(&local->mtx);
        mutex_lock(&local->chanctx_mtx);

        if (!ifmgd->associated)
                goto out;

        if (!sdata->vif.csa_active)
                goto out;

        /*
         * 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 (sdata->reserved_chanctx) {
                struct ieee80211_supported_band *sband = NULL;
                struct sta_info *mgd_sta = NULL;
                enum ieee80211_sta_rx_bandwidth bw = IEEE80211_STA_RX_BW_20;

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

                if (sdata->vif.bss_conf.chandef.width !=
                    sdata->csa_chandef.width) {
                        /*
                         * For managed interface, we need to also update the AP
                         * station bandwidth and align the rate scale algorithm
                         * on the bandwidth change. Here we only consider the
                         * bandwidth of the new channel definition (as channel
                         * switch flow does not have the full HT/VHT/HE
                         * information), assuming that if additional changes are
                         * required they would be done as part of the processing
                         * of the next beacon from the AP.
                         */
                        switch (sdata->csa_chandef.width) {
                        case NL80211_CHAN_WIDTH_20_NOHT:
                        case NL80211_CHAN_WIDTH_20:
                        default:
                                bw = IEEE80211_STA_RX_BW_20;
                                break;
                        case NL80211_CHAN_WIDTH_40:
                                bw = IEEE80211_STA_RX_BW_40;
                                break;
                        case NL80211_CHAN_WIDTH_80:
                                bw = IEEE80211_STA_RX_BW_80;
                                break;
                        case NL80211_CHAN_WIDTH_80P80:
                        case NL80211_CHAN_WIDTH_160:
                                bw = IEEE80211_STA_RX_BW_160;
                                break;
                        }

                        mgd_sta = sta_info_get(sdata, ifmgd->bssid);
                        sband =
                                local->hw.wiphy->bands[sdata->csa_chandef.chan->band];
                }

                if (sdata->vif.bss_conf.chandef.width >
                    sdata->csa_chandef.width) {
                        mgd_sta->sta.bandwidth = bw;
                        rate_control_rate_update(local, sband, mgd_sta,
                                                 IEEE80211_RC_BW_CHANGED);
                }

                ret = ieee80211_vif_use_reserved_context(sdata);
                if (ret) {
                        sdata_info(sdata,
                                   "failed to use reserved channel context, disconnecting (err=%d)\n",
                                   ret);
                        ieee80211_queue_work(&sdata->local->hw,
                                             &ifmgd->csa_connection_drop_work);
                        goto out;
                }

                if (sdata->vif.bss_conf.chandef.width <
                    sdata->csa_chandef.width) {
                        mgd_sta->sta.bandwidth = bw;
                        rate_control_rate_update(local, sband, mgd_sta,
                                                 IEEE80211_RC_BW_CHANGED);
                }

                goto out;
        }

        if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
                                        &sdata->csa_chandef)) {
                sdata_info(sdata,
                           "failed to finalize channel switch, disconnecting\n");
                ieee80211_queue_work(&sdata->local->hw,
                                     &ifmgd->csa_connection_drop_work);
                goto out;
        }

        ifmgd->csa_waiting_bcn = true;

        ieee80211_sta_reset_beacon_monitor(sdata);
        ieee80211_sta_reset_conn_monitor(sdata);

out:
        mutex_unlock(&local->chanctx_mtx);
        mutex_unlock(&local->mtx);
        sdata_unlock(sdata);
}

static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        int ret;

        sdata_assert_lock(sdata);

        WARN_ON(!sdata->vif.csa_active);

        if (sdata->csa_block_tx) {
                ieee80211_wake_vif_queues(local, sdata,
                                          IEEE80211_QUEUE_STOP_REASON_CSA);
                sdata->csa_block_tx = false;
        }

        sdata->vif.csa_active = false;
        ifmgd->csa_waiting_bcn = false;

        ret = drv_post_channel_switch(sdata);
        if (ret) {
                sdata_info(sdata,
                           "driver post channel switch failed, disconnecting\n");
                ieee80211_queue_work(&local->hw,
                                     &ifmgd->csa_connection_drop_work);
                return;
        }

        cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
}

void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
{
        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

        trace_api_chswitch_done(sdata, success);
        if (!success) {
                sdata_info(sdata,
                           "driver channel switch failed, disconnecting\n");
                ieee80211_queue_work(&sdata->local->hw,
                                     &ifmgd->csa_connection_drop_work);
        } else {
                ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
        }
}
EXPORT_SYMBOL(ieee80211_chswitch_done);

static void ieee80211_chswitch_timer(struct timer_list *t)
{
        struct ieee80211_sub_if_data *sdata =
                from_timer(sdata, t, u.mgd.chswitch_timer);

        ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
}

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

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

        mutex_lock(&local->mtx);

        mutex_lock(&local->chanctx_mtx);
        ieee80211_vif_unreserve_chanctx(sdata);
        mutex_unlock(&local->chanctx_mtx);

        if (sdata->csa_block_tx)
                ieee80211_wake_vif_queues(local, sdata,
                                          IEEE80211_QUEUE_STOP_REASON_CSA);

        sdata->csa_block_tx = false;
        sdata->vif.csa_active = false;

        mutex_unlock(&local->mtx);

        drv_abort_channel_switch(sdata);
}

static void
ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
                                 u64 timestamp, u32 device_timestamp,
                                 struct ieee802_11_elems *elems,
                                 bool beacon)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct cfg80211_bss *cbss = ifmgd->associated;
        struct ieee80211_chanctx_conf *conf;
        struct ieee80211_chanctx *chanctx;
        enum nl80211_band current_band;
        struct ieee80211_csa_ie csa_ie;
        struct ieee80211_channel_switch ch_switch;
        int res;

        sdata_assert_lock(sdata);

        if (!cbss)
                return;

        if (local->scanning)
                return;

        current_band = cbss->channel->band;
        res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
                                           ifmgd->flags,
                                           ifmgd->associated->bssid, &csa_ie);

        if (!res) {
                ch_switch.timestamp = timestamp;
                ch_switch.device_timestamp = device_timestamp;
                ch_switch.block_tx = csa_ie.mode;
                ch_switch.chandef = csa_ie.chandef;
                ch_switch.count = csa_ie.count;
                ch_switch.delay = csa_ie.max_switch_time;
        }

        if (res < 0) {
                ieee80211_queue_work(&local->hw,
                                     &ifmgd->csa_connection_drop_work);
                return;
        }

        if (beacon && sdata->vif.csa_active && !ifmgd->csa_waiting_bcn) {
                if (res)
                        ieee80211_sta_abort_chanswitch(sdata);
                else
                        drv_channel_switch_rx_beacon(sdata, &ch_switch);
                return;
        } else if (sdata->vif.csa_active || res) {
                /* disregard subsequent announcements if already processing */
                return;
        }

        if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
                                     IEEE80211_CHAN_DISABLED)) {
                sdata_info(sdata,
                           "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
                           ifmgd->associated->bssid,
                           csa_ie.chandef.chan->center_freq,
                           csa_ie.chandef.width, csa_ie.chandef.center_freq1,
                           csa_ie.chandef.center_freq2);
                ieee80211_queue_work(&local->hw,
                                     &ifmgd->csa_connection_drop_work);
                return;
        }

        if (cfg80211_chandef_identical(&csa_ie.chandef,
                                       &sdata->vif.bss_conf.chandef) &&
            (!csa_ie.mode || !beacon)) {
                if (ifmgd->csa_ignored_same_chan)
                        return;
                sdata_info(sdata,
                           "AP %pM tries to chanswitch to same channel, ignore\n",
                           ifmgd->associated->bssid);
                ifmgd->csa_ignored_same_chan = true;
                return;
        }

        /*
         * Drop all TDLS peers - 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(sdata);

        mutex_lock(&local->mtx);
        mutex_lock(&local->chanctx_mtx);
        conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
                                         lockdep_is_held(&local->chanctx_mtx));
        if (!conf) {
                sdata_info(sdata,
                           "no channel context assigned to vif?, disconnecting\n");
                goto drop_connection;
        }

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

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

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

        res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
                                            chanctx->mode, false);
        if (res) {
                sdata_info(sdata,
                           "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
                           res);
                goto drop_connection;
        }
        mutex_unlock(&local->chanctx_mtx);

        sdata->vif.csa_active = true;
        sdata->csa_chandef = csa_ie.chandef;
        sdata->csa_block_tx = csa_ie.mode;
        ifmgd->csa_ignored_same_chan = false;

        if (sdata->csa_block_tx)
                ieee80211_stop_vif_queues(local, sdata,
                                          IEEE80211_QUEUE_STOP_REASON_CSA);
        mutex_unlock(&local->mtx);

        cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
                                          csa_ie.count);

        if (local->ops->channel_switch) {
                /* use driver's channel switch callback */
                drv_channel_switch(local, sdata, &ch_switch);
                return;
        }

        /* channel switch handled in software */
        if (csa_ie.count <= 1)
                ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
        else
                mod_timer(&ifmgd->chswitch_timer,
                          TU_TO_EXP_TIME((csa_ie.count - 1) *
                                         cbss->beacon_interval));
        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.
         */
        sdata->vif.csa_active = true;
        sdata->csa_block_tx = csa_ie.mode;

        ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
        mutex_unlock(&local->chanctx_mtx);
        mutex_unlock(&local->mtx);
}

static bool
ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
                                 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);
                /* fall through */
        case NL80211_BAND_2GHZ:
        case NL80211_BAND_60GHZ:
                chan_increment = 1;
                break;
        case NL80211_BAND_5GHZ:
                chan_increment = 4;
                break;
        }

        /* 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_sub_if_data *sdata,
                                      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 u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
                                       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)
{
        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 (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(
                        sdata, 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(
                        sdata, 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 (sdata->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,
                          sdata->u.mgd.bssid);
        } else {  /* has_cisco_pwr is always true here. */
                new_ap_level = pwr_level_cisco;

                if (sdata->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, sdata->u.mgd.bssid);
        }

        sdata->ap_power_level = new_ap_level;
        if (__ieee80211_recalc_txpower(sdata))
                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, 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, IEEE80211_CONF_CHANGE_PS);
                del_timer_sync(&local->dynamic_ps_timer);
                cancel_work_sync(&local->dynamic_ps_enable_work);
        }
}

static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
{
        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 (!mgd->have_beacon)
                return false;

        rcu_read_lock();
        sta = sta_info_get(sdata, mgd->bssid);
        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)) {
                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->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.bss_conf.ps != ps_allowed) {
                sdata->vif.bss_conf.ps = ps_allowed;
                ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
        }
}

void ieee80211_dynamic_ps_disable_work(struct work_struct *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, 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 work_struct *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, IEEE80211_CONF_CHANGE_PS);
        }
}

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

        ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
}

void ieee80211_dfs_cac_timer_work(struct work_struct *work)
{
        struct delayed_work *delayed_work = to_delayed_work(work);
        struct ieee80211_sub_if_data *sdata =
                container_of(delayed_work, struct ieee80211_sub_if_data,
                             dfs_cac_timer_work);
        struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;

        mutex_lock(&sdata->local->mtx);
        if (sdata->wdev.cac_started) {
                ieee80211_vif_release_channel(sdata);
                cfg80211_cac_event(sdata->dev, &chandef,
                                   NL80211_RADAR_CAC_FINISHED,
                                   GFP_KERNEL);
        }
        mutex_unlock(&sdata->local->mtx);
}

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, ac, &sdata->tx_conf[ac]))
                                sdata_err(sdata,
                                          "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, ac,
                                        &sdata->tx_conf[non_acm_ac]))
                                sdata_err(sdata,
                                          "failed to set TX queue parameters for queue %d\n",
                                          ac);
                        tx_tspec->action = TX_TSPEC_ACTION_NONE;
                        ret = true;
                        schedule_delayed_work(&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_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
}

static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *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);
}

/* MLME */
static bool
ieee80211_sta_wmm_params(struct ieee80211_local *local,
                         struct ieee80211_sub_if_data *sdata,
                         const u8 *wmm_param, size_t wmm_param_len,
                         const struct ieee80211_mu_edca_param_set *mu_edca)
{
        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 == ifmgd->wmm_last_param_set &&
            mu_edca_count == ifmgd->mu_edca_last_param_set)
                return false;
        ifmgd->wmm_last_param_set = count;
        ifmgd->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) {
                        sdata_info(sdata,
                                   "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) {
                        sdata_info(sdata,
                                   "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) {
                        sdata_info(sdata,
                                   "AP has invalid WMM params (missing AC %d), using defaults\n",
                                   ac);
                        return false;
                }
        }

        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);
                sdata->tx_conf[ac] = params[ac];
                if (!ifmgd->tx_tspec[ac].downgraded &&
                    drv_conf_tx(local, sdata, ac, &params[ac]))
                        sdata_err(sdata,
                                  "failed to set TX queue parameters for AC %d\n",
                                  ac);
        }

        /* enable WMM or activate new settings */
        sdata->vif.bss_conf.qos = true;
        return true;
}

static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
{
        lockdep_assert_held(&sdata->local->mtx);

        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)
{
        mutex_lock(&sdata->local->mtx);
        __ieee80211_stop_poll(sdata);
        mutex_unlock(&sdata->local->mtx);
}

static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
                                           u16 capab, bool erp_valid, u8 erp)
{
        struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
        struct ieee80211_supported_band *sband;
        u32 changed = 0;
        bool use_protection;
        bool use_short_preamble;
        bool use_short_slot;

        sband = ieee80211_get_sband(sdata);
        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)
                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 void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
                                     struct cfg80211_bss *cbss,
                                     u32 bss_info_changed)
{
        struct ieee80211_bss *bss = (void *)cbss->priv;
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;

        bss_info_changed |= BSS_CHANGED_ASSOC;
        bss_info_changed |= ieee80211_handle_bss_capability(sdata,
                bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);

        sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
                beacon_loss_count * bss_conf->beacon_int));

        sdata->u.mgd.associated = cbss;
        memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);

        ieee80211_check_rate_mask(sdata);

        sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;

        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) {
                                sdata->u.mgd.p2p_noa_index =
                                        bss_conf->p2p_noa_attr.index;
                                bss_info_changed |= BSS_CHANGED_P2P_PS;
                        }
                }
                rcu_read_unlock();
        }

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

        ieee80211_led_assoc(local, 1);

        if (sdata->u.mgd.have_beacon) {
                /*
                 * If the AP is buggy we may get here with no DTIM period
                 * known, so assume it's 1 which is the only safe assumption
                 * in that case, although if the TIM IE is broken powersave
                 * probably just won't work at all.
                 */
                bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
                bss_conf->beacon_rate = bss->beacon_rate;
                bss_info_changed |= BSS_CHANGED_BEACON_INFO;
        } else {
                bss_conf->beacon_rate = NULL;
                bss_conf->dtim_period = 0;
        }

        bss_conf->assoc = 1;

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

        /* Enable ARP filtering */
        if (bss_conf->arp_addr_cnt)
                bss_info_changed |= BSS_CHANGED_ARP_FILTER;

        ieee80211_bss_info_change_notify(sdata, bss_info_changed);

        mutex_lock(&local->iflist_mtx);
        ieee80211_recalc_ps(local);
        mutex_unlock(&local->iflist_mtx);

        ieee80211_recalc_smps(sdata);
        ieee80211_recalc_ps_vif(sdata);

        netif_carrier_on(sdata->dev);
}

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;
        u32 changed = 0;

        sdata_assert_lock(sdata);

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

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

        ieee80211_stop_poll(sdata);

        ifmgd->associated = NULL;
        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, 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.
         */
        if (tx)
                ieee80211_flush_queues(local, sdata, true);

        /* deauthenticate/disassociate now */
        if (tx || frame_buf) {
                /*
                 * In multi channel scenarios guarantee that the virtual
                 * interface is granted immediate airtime to transmit the
                 * deauthentication frame by calling mgd_prepare_tx, if the
                 * driver requested so.
                 */
                if (ieee80211_hw_check(&local->hw, DEAUTH_NEED_MGD_TX_PREP) &&
                    !ifmgd->have_beacon)
                        drv_mgd_prepare_tx(sdata->local, sdata, 0);

                ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid,
                                               ifmgd->bssid, stype, reason,
                                               tx, frame_buf);
        }

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

        /* clear bssid only after building the needed mgmt frames */
        eth_zero_addr(ifmgd->bssid);

        /* remove AP and TDLS peers */
        sta_info_flush(sdata);

        /* finally reset all BSS / config parameters */
        changed |= ieee80211_reset_erp_info(sdata);

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

        ifmgd->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 */
        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));
        changed |= BSS_CHANGED_MU_GROUPS;
        sdata->vif.mu_mimo_owner = false;

        sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;

        del_timer_sync(&local->dynamic_ps_timer);
        cancel_work_sync(&local->dynamic_ps_enable_work);

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

        sdata->vif.bss_conf.qos = false;
        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);

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

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

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

        ifmgd->have_beacon = false;

        ifmgd->flags = 0;
        mutex_lock(&local->mtx);
        ieee80211_vif_release_channel(sdata);

        sdata->vif.csa_active = false;
        ifmgd->csa_waiting_bcn = false;
        ifmgd->csa_ignored_same_chan = false;
        if (sdata->csa_block_tx) {
                ieee80211_wake_vif_queues(local, sdata,
                                          IEEE80211_QUEUE_STOP_REASON_CSA);
                sdata->csa_block_tx = false;
        }
        mutex_unlock(&local->mtx);

        /* existing TX TSPEC sessions no longer exist */
        memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
        cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);

        sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
}

void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
                             struct ieee80211_hdr *hdr)
{
        /*
         * We can postpone the mgd.timer whenever receiving unicast frames
         * from AP because we know that the connection is working both ways
         * at that time. But multicast frames (and hence also beacons) must
         * be ignored here, because we need to trigger the timer during
         * data idle periods for sending the periodic probe request to the
         * AP we're connected to.
         */
        if (is_multicast_ether_addr(hdr->addr1))
                return;

        ieee80211_sta_reset_conn_monitor(sdata);
}

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;

        mutex_lock(&local->mtx);
        if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
                goto out;

        __ieee80211_stop_poll(sdata);

        mutex_lock(&local->iflist_mtx);
        ieee80211_recalc_ps(local);
        mutex_unlock(&local->iflist_mtx);

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

        /*
         * 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));
out:
        mutex_unlock(&local->mtx);
}

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 = ieee80211_get_tid(hdr);
        int ac = ieee80211_ac_from_tid(tid);
        struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
        unsigned long now = jiffies;

        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;
                        schedule_delayed_work(&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;
                schedule_delayed_work(&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_data(hdr->frame_control))
            return;

        if (ieee80211_is_any_nullfunc(hdr->frame_control) &&
            sdata->u.mgd.probe_send_count > 0) {
                if (ack)
                        ieee80211_sta_reset_conn_monitor(sdata);
                else
                        sdata->u.mgd.nullfunc_failed = true;
                ieee80211_queue_work(&sdata->local->hw, &sdata->work);
                return;
        }

        if (ack)
                ieee80211_sta_reset_conn_monitor(sdata);
}

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;
        const u8 *ssid;
        u8 *dst = ifmgd->associated->bssid;
        u8 unicast_limit = max(1, max_probe_tries - 3);
        struct sta_info *sta;

        /*
         * 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) {
                mutex_lock(&sdata->local->sta_mtx);
                sta = sta_info_get(sdata, dst);
                if (!WARN_ON(!sta))
                        ieee80211_check_fast_rx(sta);
                mutex_unlock(&sdata->local->sta_mtx);
        }

        if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
                ifmgd->nullfunc_failed = false;
                if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HE))
                        ifmgd->probe_send_count--;
                else
                        ieee80211_send_nullfunc(sdata->local, sdata, false);
        } else {
                int ssid_len;

                rcu_read_lock();
                ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
                if (WARN_ON_ONCE(ssid == NULL))
                        ssid_len = 0;
                else
                        ssid_len = ssid[1];

                ieee80211_mlme_send_probe_req(sdata, sdata->vif.addr, dst,
                                              ssid + 2, ssid_len,
                                              ifmgd->associated->channel);
                rcu_read_unlock();
        }

        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;

        if (!ieee80211_sdata_running(sdata))
                return;

        sdata_lock(sdata);

        if (!ifmgd->associated)
                goto out;

        mutex_lock(&sdata->local->mtx);

        if (sdata->local->tmp_channel || sdata->local->scanning) {
                mutex_unlock(&sdata->local->mtx);
                goto out;
        }

        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;

        mutex_unlock(&sdata->local->mtx);

        if (already)
                goto out;

        mutex_lock(&sdata->local->iflist_mtx);
        ieee80211_recalc_ps(sdata->local);
        mutex_unlock(&sdata->local->iflist_mtx);

        ifmgd->probe_send_count = 0;
        ieee80211_mgd_probe_ap_send(sdata);
 out:
        sdata_unlock(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 u8 *ssid;
        int ssid_len;

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

        sdata_assert_lock(sdata);

        if (ifmgd->associated)
                cbss = ifmgd->associated;
        else if (ifmgd->auth_data)
                cbss = ifmgd->auth_data->bss;
        else if (ifmgd->assoc_data)
                cbss = ifmgd->assoc_data->bss;
        else
                return NULL;

        rcu_read_lock();
        ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
        if (WARN_ONCE(!ssid || ssid[1] > IEEE80211_MAX_SSID_LEN,
                      "invalid SSID element (len=%d)", ssid ? ssid[1] : -1))
                ssid_len = 0;
        else
                ssid_len = ssid[1];

        skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
                                        (u32) -1, cbss->channel,
                                        ssid + 2, 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)
{
        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);
        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];
        bool tx;

        sdata_lock(sdata);
        if (!ifmgd->associated) {
                sdata_unlock(sdata);
                return;
        }

        tx = !sdata->csa_block_tx;

        /* AP is probably out of range (or not reachable for another reason) so
         * remove the bss struct for that AP.
         */
        cfg80211_unlink_bss(local->hw.wiphy, ifmgd->associated);

        ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
                               WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
                               tx, frame_buf);
        mutex_lock(&local->mtx);
        sdata->vif.csa_active = false;
        ifmgd->csa_waiting_bcn = false;
        if (sdata->csa_block_tx) {
                ieee80211_wake_vif_queues(local, sdata,
                                          IEEE80211_QUEUE_STOP_REASON_CSA);
                sdata->csa_block_tx = false;
        }
        mutex_unlock(&local->mtx);

        ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), tx,
                                    WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);

        sdata_unlock(sdata);
}

static void ieee80211_beacon_connection_loss_work(struct work_struct *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->associated)
                ifmgd->beacon_loss_count++;

        if (ifmgd->connection_loss) {
                sdata_info(sdata, "Connection to AP %pM lost\n",
                           ifmgd->bssid);
                __ieee80211_disconnect(sdata);
        } else {
                ieee80211_mgd_probe_ap(sdata, true);
        }
}

static void ieee80211_csa_connection_drop_work(struct work_struct *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;
        ieee80211_queue_work(hw, &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 = vif_to_sdata(vif);
        struct ieee80211_hw *hw = &sdata->local->hw;

        trace_api_connection_loss(sdata);

        sdata->u.mgd.connection_loss = true;
        ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_connection_loss);


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;

        sdata_assert_lock(sdata);

        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.
                 */
                del_timer_sync(&sdata->u.mgd.timer);
                sta_info_destroy_addr(sdata, auth_data->bss->bssid);

                eth_zero_addr(sdata->u.mgd.bssid);
                ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
                sdata->u.mgd.flags = 0;
                mutex_lock(&sdata->local->mtx);
                ieee80211_vif_release_channel(sdata);
                mutex_unlock(&sdata->local->mtx);
        }

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

static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
                                         bool assoc, bool abandon)
{
        struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;

        sdata_assert_lock(sdata);

        if (!assoc) {
                /*
                 * 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.
                 */
                del_timer_sync(&sdata->u.mgd.timer);
                sta_info_destroy_addr(sdata, assoc_data->bss->bssid);

                eth_zero_addr(sdata->u.mgd.bssid);
                ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
                sdata->u.mgd.flags = 0;
                sdata->vif.mu_mimo_owner = false;

                mutex_lock(&sdata->local->mtx);
                ieee80211_vif_release_channel(sdata);
                mutex_unlock(&sdata->local->mtx);

                if (abandon)
                        cfg80211_abandon_assoc(sdata->dev, assoc_data->bss);
        }

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

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;
        u8 *pos;
        struct ieee802_11_elems elems;
        u32 tx_flags = 0;

        pos = mgmt->u.auth.variable;
        ieee802_11_parse_elems(pos, len - (pos - (u8 *)mgmt), false, &elems,
                               mgmt->bssid, auth_data->bss->bssid);
        if (!elems.challenge)
                return;
        auth_data->expected_transaction = 4;
        drv_mgd_prepare_tx(sdata->local, sdata, 0);
        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,
                            elems.challenge - 2, elems.challenge_len + 2,
                            auth_data->bss->bssid, auth_data->bss->bssid,
                            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,
                                    const u8 *bssid)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct sta_info *sta;
        bool result = true;

        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 */
        mutex_lock(&sdata->local->sta_mtx);
        sta = sta_info_get(sdata, bssid);
        if (!sta) {
                WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
                result = false;
                goto out;
        }
        if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
                sdata_info(sdata, "failed moving %pM to auth\n", bssid);
                result = false;
                goto out;
        }

out:
        mutex_unlock(&sdata->local->sta_mtx);
        return result;
}

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;
        u8 bssid[ETH_ALEN];
        u16 auth_alg, auth_transaction, status_code;
        struct ieee80211_event event = {
                .type = MLME_EVENT,
                .u.mlme.data = AUTH_EVENT,
        };

        sdata_assert_lock(sdata);

        if (len < 24 + 6)
                return;

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

        memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);

        if (!ether_addr_equal(bssid, 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);

        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);
                return;
        }

        if (status_code != WLAN_STATUS_SUCCESS) {
                sdata_info(sdata, "%pM denied authentication (status %d)\n",
                           mgmt->sa, status_code);
                ieee80211_destroy_auth_data(sdata, false);
                cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
                event.u.mlme.status = MLME_DENIED;
                event.u.mlme.reason = status_code;
                drv_event_callback(sdata->local, sdata, &event);
                return;
        }

        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:
                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);
                return;
        }

        event.u.mlme.status = MLME_SUCCESS;
        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, bssid))
                        return; /* ignore frame -- wait for timeout */
        } 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);
}

#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);

        sdata_assert_lock(sdata);

        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, ifmgd->associated->bssid)) {
                const u8 *bssid = ifmgd->associated->bssid;

                sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
                           bssid, 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);
                return;
        }

        if (ifmgd->assoc_data &&
            ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
                const u8 *bssid = ifmgd->assoc_data->bss->bssid;

                sdata_info(sdata,
                           "deauthenticated from %pM while associating (Reason: %u=%s)\n",
                           bssid, reason_code,
                           ieee80211_get_reason_code_string(reason_code));

                ieee80211_destroy_assoc_data(sdata, false, true);

                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;

        sdata_assert_lock(sdata);

        if (len < 24 + 2)
                return;

        if (!ifmgd->associated ||
            !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
                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",
                   mgmt->sa, 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);
}

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

        for (i = 0; i < supp_rates_len; i++) {
                int rate = supp_rates[i] & 0x7f;
                bool is_basic = !!(supp_rates[i] & 0x80);

                if ((rate * 5 * (1 << shift)) > 110)
                        *have_higher_than_11mbit = true;

                /*
                 * Skip HT and VHT BSS 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 (supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_HT_PHY) ||
                    supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_VHT_PHY))
                        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, (1 << shift) * 5);
                        if (brate == rate) {
                                *rates |= BIT(j);
                                if (is_basic)
                                        *basic_rates |= BIT(j);
                                if ((rate * 5) < *min_rate) {
                                        *min_rate = rate * 5;
                                        *min_rate_index = j;
                                }
                                break;
                        }
                }
        }
}

static bool ieee80211_twt_req_supported(const struct sta_info *sta,
                                        const struct ieee802_11_elems *elems)
{
        if (elems->ext_capab_len < 10)
                return false;

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

        return sta->sta.he_cap.he_cap_elem.mac_cap_info[0] &
                IEEE80211_HE_MAC_CAP0_TWT_RES;
}

static int ieee80211_recalc_twt_req(struct ieee80211_sub_if_data *sdata,
                                    struct sta_info *sta,
                                    struct ieee802_11_elems *elems)
{
        bool twt = ieee80211_twt_req_supported(sta, elems);

        if (sdata->vif.bss_conf.twt_requester != twt) {
                sdata->vif.bss_conf.twt_requester = twt;
                return BSS_CHANGED_TWT;
        }
        return 0;
}

static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
                                    struct cfg80211_bss *cbss,
                                    struct ieee80211_mgmt *mgmt, size_t len,
                                    struct ieee802_11_elems *elems)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_supported_band *sband;
        struct sta_info *sta;
        u16 capab_info, aid;
        struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
        const struct cfg80211_bss_ies *bss_ies = NULL;
        struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
        u32 changed = 0;
        int err;
        bool ret;

        /* AssocResp and ReassocResp have identical structure */

        aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
        capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);

        /*
         * The 5 MSB of the AID field are reserved
         * (802.11-2016 9.4.1.8 AID field)
         */
        aid &= 0x7ff;

        ifmgd->broken_ap = false;

        if (aid == 0 || aid > IEEE80211_MAX_AID) {
                sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
                           aid);
                aid = 0;
                ifmgd->broken_ap = true;
        }

        if (!elems->supp_rates) {
                sdata_info(sdata, "no SuppRates element in AssocResp\n");
                return false;
        }

        ifmgd->aid = aid;
        ifmgd->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 ((assoc_data->wmm && !elems->wmm_param) ||
            (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
             (!elems->ht_cap_elem || !elems->ht_operation)) ||
            (!(ifmgd->flags & IEEE80211_STA_DISABLE_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)
                        return false;

                ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
                                       false, &bss_elems,
                                       mgmt->bssid,
                                       assoc_data->bss->bssid);
                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 &&
                    !(ifmgd->flags & IEEE80211_STA_DISABLE_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 &&
                    !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
                        elems->ht_operation = bss_elems.ht_operation;
                        sdata_info(sdata,
                                   "AP bug: HT operation missing from AssocResp\n");
                }
                if (!elems->vht_cap_elem && bss_elems.vht_cap_elem &&
                    !(ifmgd->flags & IEEE80211_STA_DISABLE_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 &&
                    !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
                        elems->vht_operation = bss_elems.vht_operation;
                        sdata_info(sdata,
                                   "AP bug: VHT operation missing from AssocResp\n");
                }
        }

        /*
         * We previously checked these in the beacon/probe response, so
         * they should be present here. This is just a safety net.
         */
        if (!(ifmgd->flags & IEEE80211_STA_DISABLE_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 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
            (!elems->vht_cap_elem || !elems->vht_operation)) {
                sdata_info(sdata,
                           "VHT AP is missing VHT capability/operation\n");
                ret = false;
                goto out;
        }

        mutex_lock(&sdata->local->sta_mtx);
        /*
         * station info was already allocated and inserted before
         * the association and should be available to us
         */
        sta = sta_info_get(sdata, cbss->bssid);
        if (WARN_ON(!sta)) {
                mutex_unlock(&sdata->local->sta_mtx);
                ret = false;
                goto out;
        }

        sband = ieee80211_get_sband(sdata);
        if (!sband) {
                mutex_unlock(&sdata->local->sta_mtx);
                ret = false;
                goto out;
        }

        if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HE) &&
            (!elems->he_cap || !elems->he_operation)) {
                mutex_unlock(&sdata->local->sta_mtx);
                sdata_info(sdata,
                           "HE AP is missing HE capability/operation\n");
                ret = false;
                goto out;
        }

        /* Set up internal HT/VHT capabilities */
        if (elems->ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
                ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
                                                  elems->ht_cap_elem, sta);

        if (elems->vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
                ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
                                                    elems->vht_cap_elem, sta);

        if (elems->he_operation && !(ifmgd->flags & IEEE80211_STA_DISABLE_HE) &&
            elems->he_cap) {
                ieee80211_he_cap_ie_to_sta_he_cap(sdata, sband,
                                                  elems->he_cap,
                                                  elems->he_cap_len,
                                                  sta);

                bss_conf->he_support = sta->sta.he_cap.has_he;
                changed |= ieee80211_recalc_twt_req(sdata, sta, elems);
        } else {
                bss_conf->he_support = false;
                bss_conf->twt_requester = false;
        }

        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.disabled =
                        le32_get_bits(elems->he_operation->he_oper_params,
                                      IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED);
                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->multi_sta_back_32bit =
                        sta->sta.he_cap.he_cap_elem.mac_cap_info[2] &
                        IEEE80211_HE_MAC_CAP2_32BIT_BA_BITMAP;

                bss_conf->ack_enabled =
                        sta->sta.he_cap.he_cap_elem.mac_cap_info[2] &
                        IEEE80211_HE_MAC_CAP2_ACK_EN;

                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;
                sta->sta.rx_nss = nss;
        }

        rate_control_rate_init(sta);

        if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
                set_sta_flag(sta, WLAN_STA_MFP);
                sta->sta.mfp = true;
        } else {
                sta->sta.mfp = false;
        }

        sta->sta.wme = elems->wmm_param && 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));
                mutex_unlock(&sdata->local->sta_mtx);
                ret = false;
                goto out;
        }

        mutex_unlock(&sdata->local->sta_mtx);

        /*
         * 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.
         */
        ifmgd->wmm_last_param_set = -1;
        ifmgd->mu_edca_last_param_set = -1;

        if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
                ieee80211_set_wmm_default(sdata, false, false);
        } else if (!ieee80211_sta_wmm_params(local, sdata, 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(sdata, false, true);
                /* set the disable-WMM flag 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.
                 */
                ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
        }
        changed |= BSS_CHANGED_QOS;

        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 AID and assoc capability,
         * ieee80211_set_associated() will tell the driver */
        bss_conf->aid = aid;
        bss_conf->assoc_capability = capab_info;
        ieee80211_set_associated(sdata, cbss, 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_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
        ieee80211_sta_reset_beacon_monitor(sdata);

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

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 ieee802_11_elems elems;
        int ac, uapsd_queues = -1;
        u8 *pos;
        bool reassoc;
        struct cfg80211_bss *bss;
        struct ieee80211_event event = {
                .type = MLME_EVENT,
                .u.mlme.data = ASSOC_EVENT,
        };

        sdata_assert_lock(sdata);

        if (!assoc_data)
                return;
        if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
                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);
        aid = le16_to_cpu(mgmt->u.assoc_resp.aid);

        sdata_info(sdata,
                   "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
                   reassoc ? "Rea" : "A", mgmt->sa,
                   capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));

        if (assoc_data->fils_kek_len &&
            fils_decrypt_assoc_resp(sdata, (u8 *)mgmt, &len, assoc_data) < 0)
                return;

        pos = mgmt->u.assoc_resp.variable;
        ieee802_11_parse_elems(pos, len - (pos - (u8 *)mgmt), false, &elems,
                               mgmt->bssid, assoc_data->bss->bssid);

        if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
            elems.timeout_int &&
            elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
                u32 tu, ms;
                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",
                           mgmt->sa, tu, ms);
                assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
                assoc_data->timeout_started = true;
                if (ms > IEEE80211_ASSOC_TIMEOUT)
                        run_again(sdata, assoc_data->timeout);
                return;
        }

        bss = assoc_data->bss;

        if (status_code != WLAN_STATUS_SUCCESS) {
                sdata_info(sdata, "%pM denied association (code=%d)\n",
                           mgmt->sa, status_code);
                ieee80211_destroy_assoc_data(sdata, false, false);
                event.u.mlme.status = MLME_DENIED;
                event.u.mlme.reason = status_code;
                drv_event_callback(sdata->local, sdata, &event);
        } else {
                if (!ieee80211_assoc_success(sdata, bss, mgmt, len, &elems)) {
                        /* oops -- internal error -- send timeout for now */
                        ieee80211_destroy_assoc_data(sdata, false, false);
                        cfg80211_assoc_timeout(sdata->dev, bss);
                        return;
                }
                event.u.mlme.status = MLME_SUCCESS;
                drv_event_callback(sdata->local, sdata, &event);
                sdata_info(sdata, "associated\n");

                /*
                 * destroy assoc_data afterwards, as otherwise an idle
                 * recalc after assoc_data is NULL but before associated
                 * is set can cause the interface to go idle
                 */
                ieee80211_destroy_assoc_data(sdata, true, false);

                /* get uapsd queues configuration */
                uapsd_queues = 0;
                for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
                        if (sdata->tx_conf[ac].uapsd)
                                uapsd_queues |= ieee80211_ac_to_qos_mask[ac];
        }

        cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues,
                               ifmgd->assoc_req_ies, ifmgd->assoc_req_ies_len);
}

static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
                                  struct ieee80211_mgmt *mgmt, size_t len,
                                  struct ieee80211_rx_status *rx_status)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_bss *bss;
        struct ieee80211_channel *channel;

        sdata_assert_lock(sdata);

        channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
        if (!channel)
                return;

        bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
        if (bss) {
                sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
                ieee80211_rx_bss_put(local, bss);
        }
}


static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
                                         struct sk_buff *skb)
{
        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;

        sdata_assert_lock(sdata);

        /*
         * 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(sdata->local->hw.wiphy,
                                        rx_status->freq);
        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(sdata, mgmt, len, rx_status);

        if (ifmgd->associated &&
            ether_addr_equal(mgmt->bssid, ifmgd->associated->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_sub_if_data *sdata,
                                        struct ieee80211_if_managed *ifmgd,
                                        struct ieee80211_bss_conf *bss_conf,
                                        struct ieee80211_local *local,
                                        struct ieee80211_rx_status *rx_status)
{
        /* Track average RSSI from the Beacon frames of the current AP */

        if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
                ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
                ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
                ifmgd->last_cqm_event_signal = 0;
                ifmgd->count_beacon_signal = 1;
                ifmgd->last_ave_beacon_signal = 0;
        } else {
                ifmgd->count_beacon_signal++;
        }

        ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);

        if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
            ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
                int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
                int last_sig = ifmgd->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)) {
                        ifmgd->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)) {
                        ifmgd->last_ave_beacon_signal = sig;
                        event.u.rssi.data = RSSI_EVENT_LOW;
                        drv_event_callback(local, sdata, &event);
                }
        }

        if (bss_conf->cqm_rssi_thold &&
            ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
            !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
                int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
                int last_event = ifmgd->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)) {
                        ifmgd->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)) {
                        ifmgd->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 &&
            ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
                int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
                int last_event = ifmgd->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)) {
                        ifmgd->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)) {
                        ifmgd->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_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
                                     struct ieee80211_mgmt *mgmt, size_t len,
                                     struct ieee80211_rx_status *rx_status)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
        size_t baselen;
        struct ieee802_11_elems elems;
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_chanctx_conf *chanctx_conf;
        struct ieee80211_channel *chan;
        struct sta_info *sta;
        u32 changed = 0;
        bool erp_valid;
        u8 erp_value = 0;
        u32 ncrc;
        u8 *bssid;
        u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];

        sdata_assert_lock(sdata);

        /* Process beacon from the current BSS */
        baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
        if (baselen > len)
                return;

        rcu_read_lock();
        chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
        if (!chanctx_conf) {
                rcu_read_unlock();
                return;
        }

        if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
                rcu_read_unlock();
                return;
        }
        chan = chanctx_conf->def.chan;
        rcu_read_unlock();

        if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
            ieee80211_rx_our_beacon(mgmt->bssid, ifmgd->assoc_data->bss)) {
                ieee802_11_parse_elems(mgmt->u.beacon.variable,
                                       len - baselen, false, &elems,
                                       mgmt->bssid,
                                       ifmgd->assoc_data->bss->bssid);

                ieee80211_rx_bss_info(sdata, mgmt, len, rx_status);

                if (elems.dtim_period)
                        ifmgd->dtim_period = elems.dtim_period;
                ifmgd->have_beacon = true;
                ifmgd->assoc_data->need_beacon = false;
                if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
                        sdata->vif.bss_conf.sync_tsf =
                                le64_to_cpu(mgmt->u.beacon.timestamp);
                        sdata->vif.bss_conf.sync_device_ts =
                                rx_status->device_timestamp;
                        sdata->vif.bss_conf.sync_dtim_count = elems.dtim_count;
                }

                if (elems.mbssid_config_ie)
                        bss_conf->profile_periodicity =
                                elems.mbssid_config_ie->profile_periodicity;

                if (elems.ext_capab_len >= 11 &&
                    (elems.ext_capab[10] & WLAN_EXT_CAPA11_EMA_SUPPORT))
                        bss_conf->ema_ap = true;

                /* continue assoc process */
                ifmgd->assoc_data->timeout = jiffies;
                ifmgd->assoc_data->timeout_started = true;
                run_again(sdata, ifmgd->assoc_data->timeout);
                return;
        }

        if (!ifmgd->associated ||
            !ieee80211_rx_our_beacon(mgmt->bssid,  ifmgd->associated))
                return;
        bssid = ifmgd->associated->bssid;

        if (!(rx_status->flag & RX_FLAG_NO_SIGNAL_VAL))
                ieee80211_handle_beacon_sig(sdata, 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);

        ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
        ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
                                          len - baselen, false, &elems,
                                          care_about_ies, ncrc,
                                          mgmt->bssid, bssid);

        if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
            ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
                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,
                                                    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(mgmt->u.beacon.variable,
                                            len - baselen,
                                            IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
                                            (u8 *) &noa, sizeof(noa));
                if (ret >= 2) {
                        if (sdata->u.mgd.p2p_noa_index != noa.index) {
                                /* valid noa_attr and index changed */
                                sdata->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.
                                 */
                                ifmgd->beacon_crc_valid = false;
                        }
                } else if (sdata->u.mgd.p2p_noa_index != -1) {
                        /* noa_attr not found and we had valid noa_attr before */
                        sdata->u.mgd.p2p_noa_index = -1;
                        memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
                        changed |= BSS_CHANGED_P2P_PS;
                        ifmgd->beacon_crc_valid = false;
                }
        }

        if (ifmgd->csa_waiting_bcn)
                ieee80211_chswitch_post_beacon(sdata);

        /*
         * 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)) {
                sdata->vif.bss_conf.sync_tsf =
                        le64_to_cpu(mgmt->u.beacon.timestamp);
                sdata->vif.bss_conf.sync_device_ts =
                        rx_status->device_timestamp;
                sdata->vif.bss_conf.sync_dtim_count = elems.dtim_count;
        }

        if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
                return;
        ifmgd->beacon_crc = ncrc;
        ifmgd->beacon_crc_valid = true;

        ieee80211_rx_bss_info(sdata, mgmt, len, rx_status);

        ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
                                         rx_status->device_timestamp,
                                         &elems, true);

        if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
            ieee80211_sta_wmm_params(local, sdata, 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 (!ifmgd->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;
                ifmgd->have_beacon = true;

                mutex_lock(&local->iflist_mtx);
                ieee80211_recalc_ps(local);
                mutex_unlock(&local->iflist_mtx);

                ieee80211_recalc_ps_vif(sdata);
        }

        if (elems.erp_info) {
                erp_valid = true;
                erp_value = elems.erp_info[0];
        } else {
                erp_valid = false;
        }
        changed |= ieee80211_handle_bss_capability(sdata,
                        le16_to_cpu(mgmt->u.beacon.capab_info),
                        erp_valid, erp_value);

        mutex_lock(&local->sta_mtx);
        sta = sta_info_get(sdata, bssid);

        changed |= ieee80211_recalc_twt_req(sdata, sta, &elems);

        if (ieee80211_config_bw(sdata, sta,
                                elems.ht_cap_elem, elems.ht_operation,
                                elems.vht_operation, elems.he_operation,
                                bssid, &changed)) {
                mutex_unlock(&local->sta_mtx);
                sdata_info(sdata,
                           "failed to follow AP %pM bandwidth change, disconnect\n",
                           bssid);
                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);
                return;
        }

        if (sta && elems.opmode_notif)
                ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
                                            rx_status->band);
        mutex_unlock(&local->sta_mtx);

        changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
                                               elems.country_elem,
                                               elems.country_elem_len,
                                               elems.pwr_constr_elem,
                                               elems.cisco_dtpc_elem);

        ieee80211_bss_info_change_notify(sdata, changed);
}

void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
                                  struct sk_buff *skb)
{
        struct ieee80211_rx_status *rx_status;
        struct ieee80211_mgmt *mgmt;
        u16 fc;
        struct ieee802_11_elems elems;
        int ies_len;

        rx_status = (struct ieee80211_rx_status *) skb->cb;
        mgmt = (struct ieee80211_mgmt *) skb->data;
        fc = le16_to_cpu(mgmt->frame_control);

        sdata_lock(sdata);

        switch (fc & IEEE80211_FCTL_STYPE) {
        case IEEE80211_STYPE_BEACON:
                ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
                break;
        case IEEE80211_STYPE_PROBE_RESP:
                ieee80211_rx_mgmt_probe_resp(sdata, 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 (mgmt->u.action.category == 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 */
                        ieee802_11_parse_elems(
                                mgmt->u.action.u.chan_switch.variable,
                                ies_len, true, &elems, mgmt->bssid, NULL);

                        if (elems.parse_error)
                                break;

                        ieee80211_sta_process_chanswitch(sdata,
                                                 rx_status->mactime,
                                                 rx_status->device_timestamp,
                                                 &elems, false);
                } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
                        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
                         */
                        ieee802_11_parse_elems(
                                mgmt->u.action.u.ext_chan_switch.variable,
                                ies_len, true, &elems, mgmt->bssid, NULL);

                        if (elems.parse_error)
                                break;

                        /* for the handling code pretend this was also an IE */
                        elems.ext_chansw_ie =
                                &mgmt->u.action.u.ext_chan_switch.data;

                        ieee80211_sta_process_chanswitch(sdata,
                                                 rx_status->mactime,
                                                 rx_status->device_timestamp,
                                                 &elems, false);
                }
                break;
        }
        sdata_unlock(sdata);
}

static void ieee80211_sta_timer(struct timer_list *t)
{
        struct ieee80211_sub_if_data *sdata =
                from_timer(sdata, t, u.mgd.timer);

        ieee80211_queue_work(&sdata->local->hw, &sdata->work);
}

static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
                                          u8 *bssid, 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);
}

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;
        u16 prepare_tx_duration = 0;

        sdata_assert_lock(sdata);

        if (WARN_ON_ONCE(!auth_data))
                return -EINVAL;

        auth_data->tries++;

        if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
                sdata_info(sdata, "authentication with %pM timed out\n",
                           auth_data->bss->bssid);

                /*
                 * 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)
                prepare_tx_duration =
                        jiffies_to_msecs(IEEE80211_AUTH_TIMEOUT_SAE);

        drv_mgd_prepare_tx(local, sdata, prepare_tx_duration);

        sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
                   auth_data->bss->bssid, auth_data->tries,
                   IEEE80211_AUTH_MAX_TRIES);

        auth_data->expected_transaction = 2;

        if (auth_data->algorithm == WLAN_AUTH_SAE) {
                trans = auth_data->sae_trans;
                status = auth_data->sae_status;
                auth_data->expected_transaction = trans;
        }

        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->bss->bssid,
                            auth_data->bss->bssid, 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;

        sdata_assert_lock(sdata);

        assoc_data->tries++;
        if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
                sdata_info(sdata, "association with %pM timed out\n",
                           assoc_data->bss->bssid);

                /*
                 * Most likely AP is not in the range so remove the
                 * bss struct for that AP.
                 */
                cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);

                return -ETIMEDOUT;
        }

        sdata_info(sdata, "associate with %pM (try %d/%d)\n",
                   assoc_data->bss->bssid, assoc_data->tries,
                   IEEE80211_ASSOC_MAX_TRIES);
        ieee80211_send_assoc(sdata);

        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;

        ieee80211_queue_work(&local->hw, &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;

        sdata_lock(sdata);

        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 &&
                           (ieee80211_is_assoc_req(fc) ||
                            ieee80211_is_reassoc_req(fc))) {
                        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) {
                        /*
                         * ok ... we waited for assoc but userspace didn't,
                         * so let's just kill the auth data
                         */
                        ieee80211_destroy_auth_data(sdata, false);
                } else if (ieee80211_auth(sdata)) {
                        u8 bssid[ETH_ALEN];
                        struct ieee80211_event event = {
                                .type = MLME_EVENT,
                                .u.mlme.data = AUTH_EVENT,
                                .u.mlme.status = MLME_TIMEOUT,
                        };

                        memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);

                        ieee80211_destroy_auth_data(sdata, false);

                        cfg80211_auth_timeout(sdata->dev, bssid);
                        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 && !ifmgd->have_beacon) ||
                    ieee80211_do_assoc(sdata)) {
                        struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
                        struct ieee80211_event event = {
                                .type = MLME_EVENT,
                                .u.mlme.data = ASSOC_EVENT,
                                .u.mlme.status = MLME_TIMEOUT,
                        };

                        ieee80211_destroy_assoc_data(sdata, false, false);
                        cfg80211_assoc_timeout(sdata->dev, bss);
                        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[ETH_ALEN];
                int max_tries;

                memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);

                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, bssid,
                                        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, bssid,
                                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, bssid,
                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
                }
        }

        sdata_unlock(sdata);
}

static void ieee80211_sta_bcn_mon_timer(struct timer_list *t)
{
        struct ieee80211_sub_if_data *sdata =
                from_timer(sdata, t, u.mgd.bcn_mon_timer);
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

        if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
                return;

        sdata->u.mgd.connection_loss = false;
        ieee80211_queue_work(&sdata->local->hw,
                             &sdata->u.mgd.beacon_connection_loss_work);
}

static void ieee80211_sta_conn_mon_timer(struct timer_list *t)
{
        struct ieee80211_sub_if_data *sdata =
                from_timer(sdata, t, u.mgd.conn_mon_timer);
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct ieee80211_local *local = sdata->local;

        if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
                return;

        ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
}

static void ieee80211_sta_monitor_work(struct work_struct *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))
                        ieee80211_queue_work(&sdata->local->hw,
                                             &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];

        sdata_lock(sdata);

        if (ifmgd->auth_data || ifmgd->assoc_data) {
                const u8 *bssid = ifmgd->auth_data ?
                                ifmgd->auth_data->bss->bssid :
                                ifmgd->assoc_data->bss->bssid;

                /*
                 * 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, bssid, bssid,
                                               IEEE80211_STYPE_DEAUTH,
                                               WLAN_REASON_DEAUTH_LEAVING,
                                               false, frame_buf);
                if (ifmgd->assoc_data)
                        ieee80211_destroy_assoc_data(sdata, false, true);
                if (ifmgd->auth_data)
                        ieee80211_destroy_auth_data(sdata, false);
                cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
                                      IEEE80211_DEAUTH_FRAME_LEN);
        }

        /* 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, ifmgd->associated->bssid, ETH_ALEN);
                ieee80211_mgd_deauth(sdata, &req);
        }

        sdata_unlock(sdata);
}

void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

        sdata_lock(sdata);
        if (!ifmgd->associated) {
                sdata_unlock(sdata);
                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,
                                              ifmgd->associated->bssid,
                                              WLAN_REASON_UNSPECIFIED,
                                              true);
                sdata_unlock(sdata);
                return;
        }
        sdata_unlock(sdata);
}
#endif

/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_if_managed *ifmgd;

        ifmgd = &sdata->u.mgd;
        INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
        INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
        INIT_WORK(&ifmgd->beacon_connection_loss_work,
                  ieee80211_beacon_connection_loss_work);
        INIT_WORK(&ifmgd->csa_connection_drop_work,
                  ieee80211_csa_connection_drop_work);
        INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
        INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
                          ieee80211_tdls_peer_del_work);
        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);
        timer_setup(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 0);
        INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
                          ieee80211_sta_handle_tspec_ac_params_wk);

        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;
        ifmgd->p2p_noa_index = -1;

        if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
                ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
        else
                ifmgd->req_smps = IEEE80211_SMPS_OFF;

        /* Setup TDLS data */
        spin_lock_init(&ifmgd->teardown_lock);
        ifmgd->teardown_skb = NULL;
        ifmgd->orig_teardown_skb = NULL;
}

/* 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 u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
                                     struct cfg80211_bss *cbss)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        const u8 *ht_cap_ie, *vht_cap_ie;
        const struct ieee80211_ht_cap *ht_cap;
        const struct ieee80211_vht_cap *vht_cap;
        u8 chains = 1;

        if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
                return chains;

        ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
        if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
                ht_cap = (void *)(ht_cap_ie + 2);
                chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
                /*
                 * TODO: use "Tx Maximum Number Spatial Streams Supported" and
                 *       "Tx Unequal Modulation Supported" fields.
                 */
        }

        if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
                return chains;

        vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
        if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
                u8 nss;
                u16 tx_mcs_map;

                vht_cap = (void *)(vht_cap_ie + 2);
                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);
        }

        return chains;
}

static bool
ieee80211_verify_sta_he_mcs_support(struct ieee80211_supported_band *sband,
                                    const struct ieee80211_he_operation *he_op)
{
        const struct ieee80211_sta_he_cap *sta_he_cap =
                ieee80211_get_he_sta_cap(sband);
        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);

        /* 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
                         */
                        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 int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
                                  struct cfg80211_bss *cbss)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        const struct ieee80211_ht_cap *ht_cap = NULL;
        const struct ieee80211_ht_operation *ht_oper = NULL;
        const struct ieee80211_vht_operation *vht_oper = NULL;
        const struct ieee80211_he_operation *he_oper = NULL;
        struct ieee80211_supported_band *sband;
        struct cfg80211_chan_def chandef;
        int ret;
        u32 i;
        bool have_80mhz;

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

        ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
                          IEEE80211_STA_DISABLE_80P80MHZ |
                          IEEE80211_STA_DISABLE_160MHZ);

        /* disable HT/VHT/HE if we don't support them */
        if (!sband->ht_cap.ht_supported) {
                ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
                ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
                ifmgd->flags |= IEEE80211_STA_DISABLE_HE;
        }

        if (!sband->vht_cap.vht_supported)
                ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;

        if (!ieee80211_get_he_sta_cap(sband))
                ifmgd->flags |= IEEE80211_STA_DISABLE_HE;

        rcu_read_lock();

        if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
                const u8 *ht_oper_ie, *ht_cap_ie;

                ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
                if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
                        ht_oper = (void *)(ht_oper_ie + 2);

                ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
                if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
                        ht_cap = (void *)(ht_cap_ie + 2);

                if (!ht_cap) {
                        ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
                        ht_oper = NULL;
                }
        }

        if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
                const u8 *vht_oper_ie, *vht_cap;

                vht_oper_ie = ieee80211_bss_get_ie(cbss,
                                                   WLAN_EID_VHT_OPERATION);
                if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
                        vht_oper = (void *)(vht_oper_ie + 2);
                if (vht_oper && !ht_oper) {
                        vht_oper = NULL;
                        sdata_info(sdata,
                                   "AP advertised VHT without HT, disabling HT/VHT/HE\n");
                        ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
                        ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
                        ifmgd->flags |= IEEE80211_STA_DISABLE_HE;
                }

                vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
                if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
                        ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
                        vht_oper = NULL;
                }
        }

        if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HE)) {
                const struct cfg80211_bss_ies *ies;
                const u8 *he_oper_ie;

                ies = rcu_dereference(cbss->ies);
                he_oper_ie = cfg80211_find_ext_ie(WLAN_EID_EXT_HE_OPERATION,
                                                  ies->data, ies->len);
                if (he_oper_ie &&
                    he_oper_ie[1] == ieee80211_he_oper_size(&he_oper_ie[3]))
                        he_oper = (void *)(he_oper_ie + 3);
                else
                        he_oper = NULL;

                if (!ieee80211_verify_sta_he_mcs_support(sband, he_oper))
                        ifmgd->flags |= IEEE80211_STA_DISABLE_HE;
        }

        /* Allow VHT if at least one channel on the sband supports 80 MHz */
        have_80mhz = false;
        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)
                ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;

        ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
                                                     cbss->channel,
                                                     ht_oper, vht_oper, he_oper,
                                                     &chandef, false);

        sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
                                      local->rx_chains);

        rcu_read_unlock();

        /* will change later if needed */
        sdata->smps_mode = IEEE80211_SMPS_OFF;

        mutex_lock(&local->mtx);
        /*
         * 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_vif_use_channel(sdata, &chandef,
                                        IEEE80211_CHANCTX_SHARED);

        /* don't downgrade for 5 and 10 MHz channels, though. */
        if (chandef.width == NL80211_CHAN_WIDTH_5 ||
            chandef.width == NL80211_CHAN_WIDTH_10)
                goto out;

        while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
                ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
                ret = ieee80211_vif_use_channel(sdata, &chandef,
                                                IEEE80211_CHANCTX_SHARED);
        }
 out:
        mutex_unlock(&local->mtx);
        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 int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
                                     struct cfg80211_bss *cbss, bool assoc,
                                     bool override)
{
        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_supported_band *sband;
        bool have_sta = false;
        int err;

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

        if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
                return -EINVAL;

        /* If a reconfig is happening, bail out */
        if (local->in_reconfig)
                return -EBUSY;

        if (assoc) {
                rcu_read_lock();
                have_sta = sta_info_get(sdata, cbss->bssid);
                rcu_read_unlock();
        }

        if (!have_sta) {
                new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
                if (!new_sta)
                        return -ENOMEM;
        }

        /*
         * 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) {
                u32 rates = 0, basic_rates = 0;
                bool have_higher_than_11mbit;
                int min_rate = INT_MAX, min_rate_index = -1;
                const struct cfg80211_bss_ies *ies;
                int shift = ieee80211_vif_get_shift(&sdata->vif);

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

                /*
                 * 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.
                 */
                if (!basic_rates && min_rate_index >= 0) {
                        sdata_info(sdata,
                                   "No basic rates, using min rate instead\n");
                        basic_rates = BIT(min_rate_index);
                }

                if (rates)
                        new_sta->sta.supp_rates[cbss->channel->band] = rates;
                else
                        sdata_info(sdata,
                                   "No rates found, keeping mandatory only\n");

                sdata->vif.bss_conf.basic_rates = basic_rates;

                /* cf. IEEE 802.11 9.2.12 */
                if (cbss->channel->band == NL80211_BAND_2GHZ &&
                    have_higher_than_11mbit)
                        sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
                else
                        sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

                memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);

                /* set timing information */
                sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
                rcu_read_lock();
                ies = rcu_dereference(cbss->beacon_ies);
                if (ies) {
                        sdata->vif.bss_conf.sync_tsf = ies->tsf;
                        sdata->vif.bss_conf.sync_device_ts =
                                bss->device_ts_beacon;

                        ieee80211_get_dtim(ies,
                                           &sdata->vif.bss_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 */
                        sdata->vif.bss_conf.sync_tsf = ies->tsf;
                        sdata->vif.bss_conf.sync_device_ts =
                                bss->device_ts_presp;
                        sdata->vif.bss_conf.sync_dtim_count = 0;
                } else {
                        sdata->vif.bss_conf.sync_tsf = 0;
                        sdata->vif.bss_conf.sync_device_ts = 0;
                        sdata->vif.bss_conf.sync_dtim_count = 0;
                }
                rcu_read_unlock();
        }

        if (new_sta || override) {
                err = ieee80211_prep_channel(sdata, cbss);
                if (err) {
                        if (new_sta)
                                sta_info_free(local, new_sta);
                        return -EINVAL;
                }
        }

        if (new_sta) {
                /*
                 * tell driver about BSSID, basic rates and timing
                 * this was set up above, before setting the channel
                 */
                ieee80211_bss_info_change_notify(sdata,
                        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);
                        return err;
                }
        } else
                WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));

        /* Cancel scan to ensure that nothing interferes with connection */
        if (local->scanning)
                ieee80211_scan_cancel(local);

        return 0;
}

/* 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;
        u16 auth_alg;
        int err;
        bool cont_auth;

        /* 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;
        default:
                return -EOPNOTSUPP;
        }

        if (ifmgd->assoc_data)
                return -EBUSY;

        auth_data = kzalloc(sizeof(*auth_data) + req->auth_data_len +
                            req->ie_len, GFP_KERNEL);
        if (!auth_data)
                return -ENOMEM;

        auth_data->bss = req->bss;

        if (req->auth_data_len >= 4) {
                if (req->auth_type == NL80211_AUTHTYPE_SAE) {
                        __le16 *pos = (__le16 *) req->auth_data;

                        auth_data->sae_trans = le16_to_cpu(pos[0]);
                        auth_data->sae_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;

        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);
        }

        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->sae_trans == 2)
                ieee80211_mark_sta_auth(sdata, req->bss->bssid);

        if (ifmgd->associated) {
                u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

                sdata_info(sdata,
                           "disconnect from AP %pM for new auth to %pM\n",
                           ifmgd->associated->bssid, req->bss->bssid);
                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);
        }

        sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);

        err = ieee80211_prep_connection(sdata, req->bss, cont_auth, false);
        if (err)
                goto err_clear;

        err = ieee80211_auth(sdata);
        if (err) {
                sta_info_destroy_addr(sdata, req->bss->bssid);
                goto err_clear;
        }

        /* hold our own reference */
        cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
        return 0;

 err_clear:
        eth_zero_addr(ifmgd->bssid);
        ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
        ifmgd->auth_data = NULL;
        mutex_lock(&sdata->local->mtx);
        ieee80211_vif_release_channel(sdata);
        mutex_unlock(&sdata->local->mtx);
        kfree(auth_data);
        return err;
}

int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
                        struct cfg80211_assoc_request *req)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct ieee80211_bss *bss = (void *)req->bss->priv;
        struct ieee80211_mgd_assoc_data *assoc_data;
        const struct cfg80211_bss_ies *beacon_ies;
        struct ieee80211_supported_band *sband;
        const u8 *ssidie, *ht_ie, *vht_ie;
        int i, err;
        bool override = false;

        assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
        if (!assoc_data)
                return -ENOMEM;

        rcu_read_lock();
        ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
        if (!ssidie || ssidie[1] > sizeof(assoc_data->ssid)) {
                rcu_read_unlock();
                kfree(assoc_data);
                return -EINVAL;
        }
        memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
        assoc_data->ssid_len = ssidie[1];
        rcu_read_unlock();

        if (ifmgd->associated) {
                u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

                sdata_info(sdata,
                           "disconnect from AP %pM for new assoc to %pM\n",
                           ifmgd->associated->bssid, req->bss->bssid);
                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);
        }

        if (ifmgd->auth_data && !ifmgd->auth_data->done) {
                err = -EBUSY;
                goto err_free;
        }

        if (ifmgd->assoc_data) {
                err = -EBUSY;
                goto err_free;
        }

        if (ifmgd->auth_data) {
                bool match;

                /* keep sta info, bssid if matching */
                match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
                ieee80211_destroy_auth_data(sdata, match);
        }

        /* prepare assoc data */

        ifmgd->beacon_crc_valid = false;

        assoc_data->wmm = bss->wmm_used &&
                          (local->hw.queues >= IEEE80211_NUM_ACS);

        /*
         * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
         * We still associate in non-HT mode (11a/b/g) if any one of these
         * ciphers is configured as pairwise.
         * We can set this to true for non-11n hardware, that'll be checked
         * separately along with the peer capabilities.
         */
        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) {
                        ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
                        ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
                        ifmgd->flags |= IEEE80211_STA_DISABLE_HE;
                        netdev_info(sdata->dev,
                                    "disabling HT/VHT/HE due to WEP/TKIP use\n");
                }
        }

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

        /* also disable HT/VHT/HE if the AP doesn't use WMM */
        if (!bss->wmm_used) {
                ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
                ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
                ifmgd->flags |= IEEE80211_STA_DISABLE_HE;
                netdev_info(sdata->dev,
                            "disabling HT/VHT/HE as WMM/QoS is not supported by the AP\n");
        }

        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));

        if (req->ie && req->ie_len) {
                memcpy(assoc_data->ie, req->ie, req->ie_len);
                assoc_data->ie_len = req->ie_len;
        }

        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);

        assoc_data->bss = req->bss;

        if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
                if (ifmgd->powersave)
                        sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
                else
                        sdata->smps_mode = IEEE80211_SMPS_OFF;
        } else
                sdata->smps_mode = ifmgd->req_smps;

        assoc_data->capability = req->bss->capability;
        assoc_data->supp_rates = bss->supp_rates;
        assoc_data->supp_rates_len = bss->supp_rates_len;

        rcu_read_lock();
        ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
        if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
                assoc_data->ap_ht_param =
                        ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
        else
                ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
        vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
        if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
                memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
                       sizeof(struct ieee80211_vht_cap));
        else
                ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
        rcu_read_unlock();

        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 (bss->wmm_used && bss->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_bssid, 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;
        sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
                                                        sdata->vif.type);

        /* kick off associate process */

        ifmgd->assoc_data = assoc_data;
        ifmgd->dtim_period = 0;
        ifmgd->have_beacon = false;

        /* override HT/VHT configuration only if the AP and we support it */
        if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
                struct ieee80211_sta_ht_cap sta_ht_cap;

                if (req->flags & ASSOC_REQ_DISABLE_HT)
                        override = true;

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

                /* check for 40 MHz disable override */
                if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
                    sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
                    !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
                        override = true;

                if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
                    req->flags & ASSOC_REQ_DISABLE_VHT)
                        override = true;
        }

        if (req->flags & ASSOC_REQ_DISABLE_HT) {
                ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
                ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
                ifmgd->flags |= IEEE80211_STA_DISABLE_HE;
        }

        if (req->flags & ASSOC_REQ_DISABLE_VHT)
                ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;

        err = ieee80211_prep_connection(sdata, req->bss, true, override);
        if (err)
                goto err_clear;

        rcu_read_lock();
        beacon_ies = rcu_dereference(req->bss->beacon_ies);

        if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
            !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",
                           ifmgd->bssid);
                assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
                assoc_data->timeout_started = true;
                assoc_data->need_beacon = true;
        } else if (beacon_ies) {
                const u8 *ie;
                u8 dtim_count = 0;

                ieee80211_get_dtim(beacon_ies, &dtim_count,
                                   &ifmgd->dtim_period);

                ifmgd->have_beacon = true;
                assoc_data->timeout = jiffies;
                assoc_data->timeout_started = true;

                if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
                        sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
                        sdata->vif.bss_conf.sync_device_ts =
                                bss->device_ts_beacon;
                        sdata->vif.bss_conf.sync_dtim_count = dtim_count;
                }

                ie = cfg80211_find_ext_ie(WLAN_EID_EXT_MULTIPLE_BSSID_CONFIGURATION,
                                          beacon_ies->data, beacon_ies->len);
                if (ie && ie[1] >= 3)
                        sdata->vif.bss_conf.profile_periodicity = ie[4];

                ie = cfg80211_find_ie(WLAN_EID_EXT_CAPABILITY,
                                      beacon_ies->data, beacon_ies->len);
                if (ie && ie[1] >= 11 &&
                    (ie[10] & WLAN_EXT_CAPA11_EMA_SUPPORT))
                        sdata->vif.bss_conf.ema_ap = true;
        } else {
                assoc_data->timeout = jiffies;
                assoc_data->timeout_started = true;
        }
        rcu_read_unlock();

        run_again(sdata, assoc_data->timeout);

        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 with AP with corrupt %s\n",
                           corrupt_type);
        }

        return 0;
 err_clear:
        eth_zero_addr(ifmgd->bssid);
        ieee80211_bss_info_change_notify(sdata, 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;

        if (ifmgd->auth_data &&
            ether_addr_equal(ifmgd->auth_data->bss->bssid, 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));

                drv_mgd_prepare_tx(sdata->local, sdata, 0);
                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);

                return 0;
        }

        if (ifmgd->assoc_data &&
            ether_addr_equal(ifmgd->assoc_data->bss->bssid, 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));

                drv_mgd_prepare_tx(sdata->local, sdata, 0);
                ieee80211_send_deauth_disassoc(sdata, req->bssid, req->bssid,
                                               IEEE80211_STYPE_DEAUTH,
                                               req->reason_code, tx,
                                               frame_buf);
                ieee80211_destroy_assoc_data(sdata, false, true);
                ieee80211_report_disconnect(sdata, frame_buf,
                                            sizeof(frame_buf), true,
                                            req->reason_code);
                return 0;
        }

        if (ifmgd->associated &&
            ether_addr_equal(ifmgd->associated->bssid, 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);
                return 0;
        }

        return -ENOTCONN;
}

int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
                           struct cfg80211_disassoc_request *req)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        u8 bssid[ETH_ALEN];
        u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

        /*
         * cfg80211 should catch this ... but it's racy since
         * we can receive a disassoc frame, process it, hand it
         * to cfg80211 while that's in a locked section already
         * trying to tell us that the user wants to disconnect.
         */
        if (ifmgd->associated != req->bss)
                return -ENOLINK;

        sdata_info(sdata,
                   "disassociating from %pM by local choice (Reason: %u=%s)\n",
                   req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));

        memcpy(bssid, req->bss->bssid, ETH_ALEN);
        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);

        return 0;
}

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.
         */
        cancel_work_sync(&ifmgd->monitor_work);
        cancel_work_sync(&ifmgd->beacon_connection_loss_work);
        cancel_work_sync(&ifmgd->request_smps_work);
        cancel_work_sync(&ifmgd->csa_connection_drop_work);
        cancel_work_sync(&ifmgd->chswitch_work);
        cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);

        sdata_lock(sdata);
        if (ifmgd->assoc_data) {
                struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
                ieee80211_destroy_assoc_data(sdata, false, false);
                cfg80211_assoc_timeout(sdata->dev, bss);
        }
        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);
        del_timer_sync(&ifmgd->timer);
        sdata_unlock(sdata);
}

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);