Release 4.11 net/mac80211/mlme.c

/*
 * 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 - 2016 Intel Deutschland GmbH
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/delay.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_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);
}

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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));
}

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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));
}

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

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static u32

ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
			     struct ieee80211_supported_band *sband,
			     struct ieee80211_channel *channel,
			     const struct ieee80211_ht_cap *ht_cap,
			     const struct ieee80211_ht_operation *ht_oper,
			     const struct ieee80211_vht_operation *vht_oper,
			     struct cfg80211_chan_def *chandef, bool tracking)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct cfg80211_chan_def vht_chandef;
	struct ieee80211_sta_ht_cap sta_ht_cap;
	u32 ht_cfreq, ret;

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

	chandef->chan = channel;
	chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
	chandef->center_freq1 = channel->center_freq;
	chandef->center_freq2 = 0;

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

	chandef->width = NL80211_CHAN_WIDTH_20;

	if (!(ht_cap->cap_info &
	      cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
		ret = IEEE80211_STA_DISABLE_40MHZ;
		vht_chandef = *chandef;
		goto out;
	}

	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;
		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 (!ieee80211_chandef_vht_oper(vht_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;
			break;
		}

		ret |= ieee80211_chandef_downgrade(chandef);
	}

	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;
}

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

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

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

	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;
	}

	chan = sdata->vif.bss_conf.chandef.chan;
	sband = local->hw.wiphy->bands[chan->band];

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

	/*
         * Downgrade the new channel if we associated with restricted
         * capabilities. For example, if we associated as a 20 MHz STA
         * to a 40 MHz AP (due to regulatory, capabilities or config
         * reasons) then switching to a 40 MHz channel now won't do us
         * any good -- we couldn't use it with the AP.
         */
	if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
	    chandef.width == NL80211_CHAN_WIDTH_80P80)
		flags |= ieee80211_chandef_downgrade(&chandef);
	if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
	    chandef.width == NL80211_CHAN_WIDTH_160)
		flags |= ieee80211_chandef_downgrade(&chandef);
	if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
	    chandef.width > NL80211_CHAN_WIDTH_20)
		flags |= ieee80211_chandef_downgrade(&chandef);

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

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

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

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

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

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

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

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

	return 0;
}

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/* 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);
	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);
}

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/* This function determines vht capability flags for the association
 * and builds the IE.
 * Note - the function may set the owner of the MU-MIMO capability
 */


static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
				 struct sk_buff *skb,
				 struct ieee80211_supported_band *sband,
				 struct ieee80211_vht_cap *ap_vht_cap)
{
	struct ieee80211_local *local = sdata->local;
	u8 *pos;
	u32 cap;
	struct ieee80211_sta_vht_cap vht_cap;
	u32 mask, ap_bf_sts, our_bf_sts;

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

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

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

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

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

	if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
		cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
		cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
	}

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

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

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

	mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;

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

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

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

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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;
	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 rate_flags, rates = 0;

	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;
	rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
	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++) {
			if ((rate_flags & sband->bitrates[i].flags)
			    != rate_flags)
				continue;
			rates |= BIT(i);
			rates_len++;
		}
	}

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

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

	capab = WLAN_CAPABILITY_ESS;

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

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

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

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

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
	memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);

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

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

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

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

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

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

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

	if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
	    capab & WLAN_CAPABILITY_RADIO_MEASURE) {
		pos = skb_put(skb, 4);
		*pos++ = WLAN_EID_PWR_CAPABILITY;
		*pos++ = 2;