// 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 - 2021 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,
                             u32 vht_cap_info,
                             const struct ieee80211_ht_operation *ht_oper,
                             const struct ieee80211_vht_operation *vht_oper,
                             const struct ieee80211_he_operation *he_oper,
                             const struct ieee80211_s1g_oper_ie *s1g_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;

        memset(chandef, 0, sizeof(struct cfg80211_chan_def));
        chandef->chan = channel;
        chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
        chandef->center_freq1 = channel->center_freq;
        chandef->freq1_offset = channel->freq_offset;

        if (channel->band == NL80211_BAND_6GHZ) {
                if (!ieee80211_chandef_he_6ghz_oper(sdata, he_oper, chandef))
                        ret = IEEE80211_STA_DISABLE_HT |
                              IEEE80211_STA_DISABLE_VHT |
                              IEEE80211_STA_DISABLE_HE;
                else
                        ret = 0;
                vht_chandef = *chandef;
                goto out;
        } else if (sband->band == NL80211_BAND_S1GHZ) {
                if (!ieee80211_chandef_s1g_oper(s1g_oper, chandef)) {
                        sdata_info(sdata,
                                   "Missing S1G Operation Element? Trying operating == primary\n");
                        chandef->width = ieee80211_s1g_channel_width(channel);
                }

                ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_40MHZ |
                      IEEE80211_STA_DISABLE_VHT |
                      IEEE80211_STA_DISABLE_80P80MHZ |
                      IEEE80211_STA_DISABLE_160MHZ;
                goto out;
        }

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

        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, vht_cap_info,
                                                &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_cap_info,
                                               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_vht_cap *vht_cap,
                               const struct ieee80211_ht_operation *ht_oper,
                               const struct ieee80211_vht_operation *vht_oper,
                               const struct ieee80211_he_operation *he_oper,
                               const struct ieee80211_s1g_oper_ie *s1g_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;
        u32 vht_cap_info = 0;
        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_iftype_cap(sband,
                                         ieee80211_vif_type_p2p(&sdata->vif)))

                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;
        }

        if (vht_cap)
                vht_cap_info = le32_to_cpu(vht_cap->vht_cap_info);

        /* calculate new channel (type) based on HT/VHT/HE operation IEs */
        flags = ieee80211_determine_chantype(sdata, sband, chan, vht_cap_info,
                                             ht_oper, vht_oper, he_oper,
                                             s1g_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.%03d MHz, "
                   "width %d (%d.%03d/%d MHz)\n",
                   ifmgd->bssid, chandef.chan->center_freq,
                   chandef.chan->freq_offset, chandef.width,
                   chandef.center_freq1, chandef.freq1_offset,
                   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 caps/bw in a way we can't support (0x%x/0x%x) - disconnect\n",
                           ifmgd->bssid, flags, ifmgd->flags);
                return -EINVAL;
        }

        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;
        }

        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);
                fallthrough;
        case IEEE80211_SMPS_OFF:
                cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
                        IEEE80211_HT_CAP_SM_PS_SHIFT;
                break;
        case IEEE80211_SMPS_STATIC:
                cap |= WLAN_HT_CAP_SM_PS_STATIC <<
                        IEEE80211_HT_CAP_SM_PS_SHIFT;
                break;
        case IEEE80211_SMPS_DYNAMIC:
                cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
                        IEEE80211_HT_CAP_SM_PS_SHIFT;
                break;
        }

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

/* This function determines vht capability flags for the association
 * and builds the IE.
 * Note - the function 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 capability we cannot associate
         * using MU-MIMO - this will lead to contradictions in the group-id
         * mechanism.
         * Ownership is defined since association request, in order to avoid
         * simultaneous associations with MU-MIMO.
         */
        if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
                bool disable_mu_mimo = false;
                struct ieee80211_sub_if_data *other;

                list_for_each_entry_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_iftype_cap(sband,
                                             ieee80211_vif_type_p2p(&sdata->vif));
        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);

        ieee80211_ie_build_he_6ghz_cap(sdata, skb);
}

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;
        __le16 listen_int;
        struct element *ext_capa = NULL;
        enum nl80211_iftype iftype = ieee80211_vif_type_p2p(&sdata->vif);
        const struct ieee80211_sband_iftype_data *iftd;
        struct ieee80211_prep_tx_info info = {};

        /* 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++;
                }
        }

        iftd = ieee80211_get_sband_iftype_data(sband, iftype);

        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 +
                        2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
                        assoc_data->ie_len + /* extra IEs */
                        (assoc_data->fils_kek_len ? 16 /* AES-SIV */ : 0) +
                        9 + /* WMM */
                        (iftd ? iftd->vendor_elems.len : 0),
                        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);

        listen_int = cpu_to_le16(sband->band == NL80211_BAND_S1GHZ ?
                        ieee80211_encode_usf(local->hw.conf.listen_interval) :
                        local->hw.conf.listen_interval);
        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 = listen_int;
                memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
                       ETH_ALEN);
                info.subtype = IEEE80211_STYPE_REASSOC_REQ;
        } else {
                skb_put(skb, 4);
                mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                                                  IEEE80211_STYPE_ASSOC_REQ);
                mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
                mgmt->u.assoc_req.listen_interval = listen_int;
                info.subtype = IEEE80211_STYPE_ASSOC_REQ;
        }

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

        if (sband->band == NL80211_BAND_S1GHZ)
                goto skip_rates;

        /* 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;
                        }
                }
        }

skip_rates:
        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 (sband->band != NL80211_BAND_6GHZ &&
            !(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 (sband->band != NL80211_BAND_6GHZ &&
            !(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);
        }

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

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

        /* 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, &info);

        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;

        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);
}

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

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

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

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

        nullfunc = skb_put_zero(skb, 30);
        fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
                         IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
        nullfunc->frame_control = fc;
        memcpy(nullfunc->addr1, sdata->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) {
                /*
                 * 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;

                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;
                }

                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;
        /*
         * If the CSA IE is still present on the beacon after the switch,
         * we need to consider it as a new CSA (possibly to self).
         */
        ifmgd->beacon_crc_valid = 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;
        struct ieee80211_bss *bss;
        int res;

        sdata_assert_lock(sdata);

        if (!cbss)
                return;

        if (local->scanning)
                return;

        current_band = cbss->channel->band;
        bss = (void *)cbss->priv;
        res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
                                           bss->vht_cap_info,
                                           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)
                goto lock_and_drop_connection;

        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 (sdata->vif.bss_conf.chandef.chan->band !=
            csa_ie.chandef.chan->band) {
                sdata_info(sdata,
                           "AP %pM switches to different band (%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);
                goto lock_and_drop_connection;
        }

        if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
                                     IEEE80211_CHAN_DISABLED)) {
                sdata_info(sdata,
                           "AP %pM switches to unsupported channel "
                           "(%d.%03d MHz, width:%d, CF1/2: %d.%03d/%d MHz), "
                           "disconnecting\n",
                           ifmgd->associated->bssid,
                           csa_ie.chandef.chan->center_freq,
                           csa_ie.chandef.chan->freq_offset,
                           csa_ie.chandef.width, csa_ie.chandef.center_freq1,
                           csa_ie.chandef.freq1_offset,
                           csa_ie.chandef.center_freq2);
                goto lock_and_drop_connection;
        }

        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;
        ifmgd->beacon_crc_valid = 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, csa_ie.mode);

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

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

                if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
                        goto next;

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

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

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

        return have_chan_pwr;
}

static void ieee80211_find_cisco_dtpc(struct ieee80211_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 (ieee80211_is_s1g_beacon(mgmt->frame_control))
                return 0;       /* TODO */

        if (country_ie &&
            (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
             capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
                has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
                        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 ||
            sband->band == NL80211_BAND_6GHZ)
                use_short_slot = true;

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

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

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

        return changed;
}

static 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;
        struct ieee80211_prep_tx_info info = {
                .subtype = stype,
        };

        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, &info);
                }

                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);

        drv_mgd_complete_tx(sdata->local, sdata, &info);

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

        sdata->vif.bss_conf.ssid_len = 0;

        /* 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;
}

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

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

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

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

static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        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;
                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, bool reconnect)
{
        struct ieee80211_event event = {
                .type = MLME_EVENT,
                .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
                .u.mlme.reason = reason,
        };

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

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

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

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

        tx = !sdata->csa_block_tx;

        if (!ifmgd->driver_disconnect) {
                /*
                 * 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,
                               ifmgd->driver_disconnect ?
                                        WLAN_REASON_DEAUTH_LEAVING :
                                        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,
                                    ifmgd->reconnect);
        ifmgd->reconnect = false;

        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);
                ifmgd->connection_loss = false;
        } else if (ifmgd->driver_disconnect) {
                sdata_info(sdata,
                           "Driver requested disconnection from AP %pM\n",
                           ifmgd->bssid);
                __ieee80211_disconnect(sdata);
                ifmgd->driver_disconnect = false;
        } 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);

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

        trace_api_disconnect(sdata, reconnect);

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

        sdata->u.mgd.driver_disconnect = true;
        sdata->u.mgd.reconnect = reconnect;
        ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_disconnect);

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

        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;
        struct ieee80211_prep_tx_info info = {
                .subtype = IEEE80211_STYPE_AUTH,
        };

        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, &info);
        if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
                tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
                           IEEE80211_TX_INTFL_MLME_CONN_TX;
        ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
                            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,
        };
        struct ieee80211_prep_tx_info info = {
                .subtype = IEEE80211_STYPE_AUTH,
        };

        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);
                goto notify_driver;
        }

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

                if (auth_alg == WLAN_AUTH_SAE &&
                    (status_code == WLAN_STATUS_ANTI_CLOG_REQUIRED ||
                     (auth_transaction == 1 &&
                      (status_code == WLAN_STATUS_SAE_HASH_TO_ELEMENT ||
                       status_code == WLAN_STATUS_SAE_PK))))
                        goto notify_driver;

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

        switch (ifmgd->auth_data->algorithm) {
        case WLAN_AUTH_OPEN:
        case WLAN_AUTH_LEAP:
        case WLAN_AUTH_FT:
        case WLAN_AUTH_SAE:
        case WLAN_AUTH_FILS_SK:
        case WLAN_AUTH_FILS_SK_PFS:
        case WLAN_AUTH_FILS_PK:
                break;