mlme.c 124.9 KB
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/*
 * BSS client mode implementation
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 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
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 * 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>
 *
 * 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.
 */

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#include <linux/delay.h>
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#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
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#include <linux/moduleparam.h>
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#include <linux/rtnetlink.h>
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#include <linux/pm_qos.h>
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#include <linux/crc32.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <net/mac80211.h>
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#include <asm/unaligned.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "rate.h"
#include "led.h"
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#define IEEE80211_AUTH_TIMEOUT		(HZ / 5)
#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_SHORT	(HZ / 10)
#define IEEE80211_ASSOC_MAX_TRIES	3
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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).");
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/*
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 * 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.
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 */
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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.");
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/*
 * Time the connection can be idle before we probe
 * it to see if we can still talk to the AP.
 */
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#define IEEE80211_CONNECTION_IDLE_TIME	(30 * HZ)
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/*
 * Time we wait for a probe response after sending
 * a probe request because of beacon loss or for
 * checking the connection still works.
 */
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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).");
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/*
 * Weight given to the latest Beacon frame when calculating average signal
 * strength for Beacon frames received in the current BSS. This must be
 * between 1 and 15.
 */
#define IEEE80211_SIGNAL_AVE_WEIGHT	3

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/*
 * 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

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/*
 * 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.
 */
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static void run_again(struct ieee80211_sub_if_data *sdata,
		      unsigned long timeout)
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{
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	sdata_assert_lock(sdata);
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	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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}

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void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
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{
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	if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
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		return;

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	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
		return;

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	mod_timer(&sdata->u.mgd.bcn_mon_timer,
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		  round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
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}

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void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
{
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	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

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	if (unlikely(!sdata->u.mgd.associated))
		return;

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	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
		return;

	mod_timer(&sdata->u.mgd.conn_mon_timer,
		  round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
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	ifmgd->probe_send_count = 0;
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}

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

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static u32 chandef_downgrade(struct cfg80211_chan_def *c)
{
	u32 ret;
	int tmp;

	switch (c->width) {
	case NL80211_CHAN_WIDTH_20:
		c->width = NL80211_CHAN_WIDTH_20_NOHT;
		ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
		break;
	case NL80211_CHAN_WIDTH_40:
		c->width = NL80211_CHAN_WIDTH_20;
		c->center_freq1 = c->chan->center_freq;
		ret = IEEE80211_STA_DISABLE_40MHZ |
		      IEEE80211_STA_DISABLE_VHT;
		break;
	case NL80211_CHAN_WIDTH_80:
		tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
		/* n_P40 */
		tmp /= 2;
		/* freq_P40 */
		c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
		c->width = NL80211_CHAN_WIDTH_40;
		ret = IEEE80211_STA_DISABLE_VHT;
		break;
	case NL80211_CHAN_WIDTH_80P80:
		c->center_freq2 = 0;
		c->width = NL80211_CHAN_WIDTH_80;
		ret = IEEE80211_STA_DISABLE_80P80MHZ |
		      IEEE80211_STA_DISABLE_160MHZ;
		break;
	case NL80211_CHAN_WIDTH_160:
		/* n_P20 */
		tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
		/* n_P80 */
		tmp /= 4;
		c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
		c->width = NL80211_CHAN_WIDTH_80;
		ret = IEEE80211_STA_DISABLE_80P80MHZ |
		      IEEE80211_STA_DISABLE_160MHZ;
		break;
	default:
	case NL80211_CHAN_WIDTH_20_NOHT:
		WARN_ON_ONCE(1);
		c->width = NL80211_CHAN_WIDTH_20_NOHT;
		ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
		break;
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	case NL80211_CHAN_WIDTH_5:
	case NL80211_CHAN_WIDTH_10:
		WARN_ON_ONCE(1);
		/* keep c->width */
		ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
		break;
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	}

	WARN_ON_ONCE(!cfg80211_chandef_valid(c));

	return ret;
}

static u32
ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
			     struct ieee80211_supported_band *sband,
			     struct ieee80211_channel *channel,
			     const struct ieee80211_ht_operation *ht_oper,
			     const struct ieee80211_vht_operation *vht_oper,
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			     struct cfg80211_chan_def *chandef, bool verbose)
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{
	struct cfg80211_chan_def vht_chandef;
	u32 ht_cfreq, ret;

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

	if (!ht_oper || !sband->ht_cap.ht_supported) {
		ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
		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 (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.
		 */
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		if (verbose)
			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);
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		ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
		goto out;
	}

	/* check 40 MHz support, if we have it */
	if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
		switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
		case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
			chandef->width = NL80211_CHAN_WIDTH_40;
			chandef->center_freq1 += 10;
			break;
		case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
			chandef->width = NL80211_CHAN_WIDTH_40;
			chandef->center_freq1 -= 10;
			break;
		}
	} else {
		/* 40 MHz (and 80 MHz) must be supported for VHT */
		ret = IEEE80211_STA_DISABLE_VHT;
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		/* also mark 40 MHz disabled */
		ret |= IEEE80211_STA_DISABLE_40MHZ;
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		goto out;
	}

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

	vht_chandef.chan = channel;
	vht_chandef.center_freq1 =
		ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
					       channel->band);
	vht_chandef.center_freq2 = 0;

	switch (vht_oper->chan_width) {
	case IEEE80211_VHT_CHANWIDTH_USE_HT:
		vht_chandef.width = chandef->width;
		break;
	case IEEE80211_VHT_CHANWIDTH_80MHZ:
		vht_chandef.width = NL80211_CHAN_WIDTH_80;
		break;
	case IEEE80211_VHT_CHANWIDTH_160MHZ:
		vht_chandef.width = NL80211_CHAN_WIDTH_160;
		break;
	case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
		vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
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		vht_chandef.center_freq2 =
			ieee80211_channel_to_frequency(
				vht_oper->center_freq_seg2_idx,
				channel->band);
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		break;
	default:
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		if (verbose)
			sdata_info(sdata,
				   "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
				   vht_oper->chan_width);
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		ret = IEEE80211_STA_DISABLE_VHT;
		goto out;
	}

	if (!cfg80211_chandef_valid(&vht_chandef)) {
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		if (verbose)
			sdata_info(sdata,
				   "AP VHT information is invalid, disable VHT\n");
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		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)) {
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		if (verbose)
			sdata_info(sdata,
				   "AP VHT information doesn't match HT, disable VHT\n");
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		ret = IEEE80211_STA_DISABLE_VHT;
		goto out;
	}

	*chandef = vht_chandef;

	ret = 0;

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

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	while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
					IEEE80211_CHAN_DISABLED)) {
		if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
			ret = IEEE80211_STA_DISABLE_HT |
			      IEEE80211_STA_DISABLE_VHT;
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			break;
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		}

		ret |= chandef_downgrade(chandef);
	}

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	if (chandef->width != vht_chandef.width && verbose)
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		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_operation *ht_oper,
			       const struct ieee80211_vht_operation *vht_oper,
			       const u8 *bssid, u32 *changed)
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{
	struct ieee80211_local *local = sdata->local;
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	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
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	struct ieee80211_supported_band *sband;
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	struct ieee80211_channel *chan;
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	struct cfg80211_chan_def chandef;
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	u16 ht_opmode;
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	u32 flags;
	enum ieee80211_sta_rx_bandwidth new_sta_bw;
	int ret;
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	/* if HT was/is disabled, don't track any bandwidth changes */
	if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
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		return 0;

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	/* 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;

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	chan = sdata->vif.bss_conf.chandef.chan;
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	sband = local->hw.wiphy->bands[chan->band];
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	/* calculate new channel (type) based on HT/VHT operation IEs */
	flags = ieee80211_determine_chantype(sdata, sband, chan, ht_oper,
					     vht_oper, &chandef, false);

	/*
	 * 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 |= chandef_downgrade(&chandef);
	if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
	    chandef.width == NL80211_CHAN_WIDTH_160)
		flags |= chandef_downgrade(&chandef);
	if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
	    chandef.width > NL80211_CHAN_WIDTH_20)
		flags |= 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;
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	case NL80211_CHAN_WIDTH_40:
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		new_sta_bw = IEEE80211_STA_RX_BW_40;
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		break;
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	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;
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		break;
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	default:
		return -EINVAL;
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	}
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	if (new_sta_bw > sta->cur_max_bandwidth)
		new_sta_bw = sta->cur_max_bandwidth;
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	if (new_sta_bw < sta->sta.bandwidth) {
		sta->sta.bandwidth = new_sta_bw;
		rate_control_rate_update(local, sband, sta,
					 IEEE80211_RC_BW_CHANGED);
	}
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	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;
	}
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	if (new_sta_bw > sta->sta.bandwidth) {
		sta->sta.bandwidth = new_sta_bw;
		rate_control_rate_update(local, sband, sta,
					 IEEE80211_RC_BW_CHANGED);
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	}
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	ht_opmode = le16_to_cpu(ht_oper->operation_mode);
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	/* if bss configuration changed store the new one */
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	if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
		*changed |= BSS_CHANGED_HT;
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		sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
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	}

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	return 0;
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}

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/* frame sending functions */

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static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
				      struct ieee80211_supported_band *sband,
				      u32 *rates)
{
	int i, j, count;
	*rates = 0;
	count = 0;
	for (i = 0; i < supp_rates_len; i++) {
		int rate = (supp_rates[i] & 0x7F) * 5;

		for (j = 0; j < sband->n_bitrates; j++)
			if (sband->bitrates[j].bitrate == rate) {
				*rates |= BIT(j);
				count++;
				break;
			}
	}

	return count;
}

static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
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				struct sk_buff *skb, u8 ap_ht_param,
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				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;

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	switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
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	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;
	}

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	/*
	 * 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;
	}

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	/* 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);
}

571 572
static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
				 struct sk_buff *skb,
573 574
				 struct ieee80211_supported_band *sband,
				 struct ieee80211_vht_cap *ap_vht_cap)
575 576 577 578 579 580 581 582
{
	u8 *pos;
	u32 cap;
	struct ieee80211_sta_vht_cap vht_cap;

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

	memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
583
	ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
584 585 586 587

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

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	if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
		cap &= ~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_160MHZ;
	}

598 599 600 601 602 603 604 605
	/*
	 * 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;

606
	/* reserve and fill IE */
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	pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
608 609 610
	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;
	u16 capab;
	struct ieee80211_supported_band *sband;
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	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
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	u32 rates = 0;

627
	sdata_assert_lock(sdata);
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	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (WARN_ON(!chanctx_conf)) {
		rcu_read_unlock();
		return;
	}
635
	chan = chanctx_conf->def.chan;
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	rcu_read_unlock();
	sband = local->hw.wiphy->bands[chan->band];
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	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_compatible_rates(assoc_data->supp_rates,
						       assoc_data->supp_rates_len,
						       sband, &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 = ~0;
		rates_len = sband->n_bitrates;
	}

	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 */
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			2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
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			assoc_data->ie_len + /* extra IEs */
			9, /* WMM */
			GFP_KERNEL);
	if (!skb)
		return;

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

	capab = WLAN_CAPABILITY_ESS;

	if (sband->band == IEEE80211_BAND_2GHZ) {
		if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
			capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
		if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
			capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
	}

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

	if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
	    (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
		capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;

	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 = sband->bitrates[i].bitrate;
			*pos++ = (u8) (rate / 5);
			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 = sband->bitrates[i].bitrate;
				*pos++ = (u8) (rate / 5);
			}
		}
	}

	if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
		/* 1. power capabilities */
		pos = skb_put(skb, 4);
		*pos++ = WLAN_EID_PWR_CAPABILITY;
		*pos++ = 2;
		*pos++ = 0; /* min tx power */
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		*pos++ = chan->max_power; /* max tx power */
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		/* 2. supported channels */
		/* 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*/
		}
	}

	/* if present, add any custom IEs that go before HT */
	if (assoc_data->ie_len && assoc_data->ie) {
		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_SUPPORTED_REGULATORY_CLASSES,
		};
		noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
					     before_ht, ARRAY_SIZE(before_ht),
					     offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
		offset = noffset;
	}

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

799
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
800
		ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
801
				    sband, chan, sdata->smps_mode);
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803
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
804 805
		ieee80211_add_vht_ie(sdata, skb, sband,
				     &assoc_data->ap_vht_cap);
806

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	/* if present, add any custom non-vendor IEs that go after HT */
	if (assoc_data->ie_len && assoc_data->ie) {
		noffset = ieee80211_ie_split_vendor(assoc_data->ie,
						    assoc_data->ie_len,
						    offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
		offset = noffset;
	}

817 818
	if (assoc_data->wmm) {
		if (assoc_data->uapsd) {
819 820
			qos_info = ifmgd->uapsd_queues;
			qos_info |= (ifmgd->uapsd_max_sp_len <<
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				     IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
		} else {
			qos_info = 0;
		}

		pos = skb_put(skb, 9);
		*pos++ = WLAN_EID_VENDOR_SPECIFIC;
		*pos++ = 7; /* len */
		*pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
		*pos++ = 0x50;
		*pos++ = 0xf2;
		*pos++ = 2; /* WME */
		*pos++ = 0; /* WME info */
		*pos++ = 1; /* WME ver */
		*pos++ = qos_info;
	}

	/* add any remaining custom (i.e. vendor specific here) IEs */
	if (assoc_data->ie_len && assoc_data->ie) {
		noffset = assoc_data->ie_len;
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
	}

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	drv_mgd_prepare_tx(local, sdata);

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	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
848 849 850
	if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
						IEEE80211_TX_INTFL_MLME_CONN_TX;
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	ieee80211_tx_skb(sdata, skb);
}

854 855 856 857 858 859
void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_pspoll *pspoll;
	struct sk_buff *skb;

860 861
	skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
	if (!skb)
862 863
		return;

864 865
	pspoll = (struct ieee80211_pspoll *) skb->data;
	pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
866

867 868
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
869 870
}

871 872 873 874 875
void ieee80211_send_nullfunc(struct ieee80211_local *local,
			     struct ieee80211_sub_if_data *sdata,
			     int powersave)
{
	struct sk_buff *skb;
876
	struct ieee80211_hdr_3addr *nullfunc;
877
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
878

879 880
	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
	if (!skb)
881 882
		return;

883
	nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
884
	if (powersave)
885
		nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
886

887 888
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
					IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
889 890 891 892

	if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;

893 894 895 896
	if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
			    IEEE80211_STA_CONNECTION_POLL))
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;

897
	ieee80211_tx_skb(sdata, skb);
898 899
}

900 901 902 903 904 905 906 907 908 909 910
static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
					  struct ieee80211_sub_if_data *sdata)
{
	struct sk_buff *skb;
	struct ieee80211_hdr *nullfunc;
	__le16 fc;

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

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
911
	if (!skb)
912
		return;
913

914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929
	skb_reserve(skb, local->hw.extra_tx_headroom);

	nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
	memset(nullfunc, 0, 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);
}

930 931 932 933 934
/* 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);
935
	struct ieee80211_local *local = sdata->local;
936 937
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

938
	if (!ieee80211_sdata_running(sdata))
939 940
		return;

941
	sdata_lock(sdata);
942 943
	if (!ifmgd->associated)
		goto out;
944

945
	local->_oper_chandef = local->csa_chandef;
946 947

	if (!local->ops->channel_switch) {
948
		/* call "hw_config" only if doing sw channel switch */
949
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
950 951
	} else {
		/* update the device channel directly */
952
		local->hw.conf.chandef = local->_oper_chandef;
953
	}
954

955
	/* XXX: shouldn't really modify cfg80211-owned data! */
956
	ifmgd->associated->channel = local->_oper_chandef.chan;
957

958
	/* XXX: wait for a beacon first? */
959
	ieee80211_wake_queues_by_reason(&local->hw,
960
					IEEE80211_MAX_QUEUE_MAP,
961
					IEEE80211_QUEUE_STOP_REASON_CSA);
962 963
 out:
	ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
964
	sdata_unlock(sdata);
965 966
}

967 968
void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
{
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	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
971 972 973

	trace_api_chswitch_done(sdata, success);
	if (!success) {
974 975 976 977 978 979
		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);
980 981 982 983
	}
}
EXPORT_SYMBOL(ieee80211_chswitch_done);

984 985 986 987
static void ieee80211_chswitch_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
988

989
	ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
990 991
}

992
static void
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ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
994 995
				 u64 timestamp, struct ieee802_11_elems *elems,
				 bool beacon)
996
{
997
	struct ieee80211_local *local = sdata->local;
998
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
999 1000
	struct cfg80211_bss *cbss = ifmgd->associated;
	struct ieee80211_bss *bss;
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1001
	struct ieee80211_chanctx *chanctx;
1002 1003 1004 1005 1006
	enum ieee80211_band new_band;
	int new_freq;
	u8 new_chan_no;
	u8 count;
	u8 mode;
1007
	struct ieee80211_channel *new_chan;
1008
	struct cfg80211_chan_def new_chandef = {};
1009 1010 1011
	struct cfg80211_chan_def new_vht_chandef = {};
	const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
	const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
1012
	const struct ieee80211_ht_operation *ht_oper;
1013
	int secondary_channel_offset = -1;
1014

1015
	sdata_assert_lock(sdata);
1016

1017
	if (!cbss)
1018 1019
		return;

1020
	if (local->scanning)
1021 1022
		return;

1023
	/* disregard subsequent announcements if we are already processing */
1024 1025 1026
	if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
		return;

1027 1028
	sec_chan_offs = elems->sec_chan_offs;
	wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
1029
	ht_oper = elems->ht_operation;
1030 1031 1032 1033 1034

	if (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
			    IEEE80211_STA_DISABLE_40MHZ)) {
		sec_chan_offs = NULL;
		wide_bw_chansw_ie = NULL;
1035 1036
		/* only used for bandwidth here */
		ht_oper = NULL;
1037 1038
	}

1039 1040
	if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
		wide_bw_chansw_ie = NULL;
1041

1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061
	if (elems->ext_chansw_ie) {
		if (!ieee80211_operating_class_to_band(
				elems->ext_chansw_ie->new_operating_class,
				&new_band)) {
			sdata_info(sdata,
				   "cannot understand ECSA IE operating class %d, disconnecting\n",
				   elems->ext_chansw_ie->new_operating_class);
			ieee80211_queue_work(&local->hw,
					     &ifmgd->csa_connection_drop_work);
		}
		new_chan_no = elems->ext_chansw_ie->new_ch_num;
		count = elems->ext_chansw_ie->count;
		mode = elems->ext_chansw_ie->mode;
	} else if (elems->ch_switch_ie) {
		new_band = cbss->channel->band;
		new_chan_no = elems->ch_switch_ie->new_ch_num;
		count = elems->ch_switch_ie->count;
		mode = elems->ch_switch_ie->mode;
	} else {
		/* nothing here we understand */
1062
		return;
1063
	}
1064 1065 1066

	bss = (void *)cbss->priv;

1067
	new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band);
1068 1069
	new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
	if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) {
1070 1071 1072
		sdata_info(sdata,
			   "AP %pM switches to unsupported channel (%d MHz), disconnecting\n",
			   ifmgd->associated->bssid, new_freq);
1073
		ieee80211_queue_work(&local->hw,
1074
				     &ifmgd->csa_connection_drop_work);
1075
		return;
1076
	}
1077

1078
	if (!beacon && sec_chan_offs) {
1079
		secondary_channel_offset = sec_chan_offs->sec_chan_offs;
1080 1081 1082
	} else if (beacon && ht_oper) {
		secondary_channel_offset =
			ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET;
1083
	} else if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
1084 1085 1086 1087 1088 1089 1090 1091
		/*
		 * If it's not a beacon, HT is enabled and the IE not present,
		 * it's 20 MHz, 802.11-2012 8.5.2.6:
		 *	This element [the Secondary Channel Offset Element] is
		 *	present when switching to a 40 MHz channel. It may be
		 *	present when switching to a 20 MHz channel (in which
		 *	case the secondary channel offset is set to SCN).
		 */
1092 1093 1094
		secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
	}

1095 1096 1097 1098
	switch (secondary_channel_offset) {
	default:
		/* secondary_channel_offset was present but is invalid */
	case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1099
		cfg80211_chandef_create(&new_chandef, new_chan,
1100 1101 1102
					NL80211_CHAN_HT20);
		break;
	case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1103
		cfg80211_chandef_create(&new_chandef, new_chan,
1104 1105 1106
					NL80211_CHAN_HT40PLUS);
		break;
	case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1107
		cfg80211_chandef_create(&new_chandef, new_chan,
1108 1109 1110
					NL80211_CHAN_HT40MINUS);
		break;
	case -1:
1111
		cfg80211_chandef_create(&new_chandef, new_chan,
1112 1113 1114 1115
					NL80211_CHAN_NO_HT);
		break;
	}

1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168
	if (wide_bw_chansw_ie) {
		new_vht_chandef.chan = new_chan;
		new_vht_chandef.center_freq1 =
			ieee80211_channel_to_frequency(
				wide_bw_chansw_ie->new_center_freq_seg0,
				new_band);

		switch (wide_bw_chansw_ie->new_channel_width) {
		default:
			/* hmmm, ignore VHT and use HT if present */
		case IEEE80211_VHT_CHANWIDTH_USE_HT:
			new_vht_chandef.chan = NULL;
			break;
		case IEEE80211_VHT_CHANWIDTH_80MHZ:
			new_vht_chandef.width = NL80211_CHAN_WIDTH_80;
			break;
		case IEEE80211_VHT_CHANWIDTH_160MHZ:
			new_vht_chandef.width = NL80211_CHAN_WIDTH_160;
			break;
		case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
			/* field is otherwise reserved */
			new_vht_chandef.center_freq2 =
				ieee80211_channel_to_frequency(
					wide_bw_chansw_ie->new_center_freq_seg1,
					new_band);
			new_vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
			break;
		}
		if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
		    new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
			chandef_downgrade(&new_vht_chandef);
		if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
		    new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
			chandef_downgrade(&new_vht_chandef);
		if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
		    new_vht_chandef.width > NL80211_CHAN_WIDTH_20)
			chandef_downgrade(&new_vht_chandef);
	}

	/* if VHT data is there validate & use it */
	if (new_vht_chandef.chan) {
		if (!cfg80211_chandef_compatible(&new_vht_chandef,
						 &new_chandef)) {
			sdata_info(sdata,
				   "AP %pM CSA has inconsistent channel data, disconnecting\n",
				   ifmgd->associated->bssid);
			ieee80211_queue_work(&local->hw,
					     &ifmgd->csa_connection_drop_work);
			return;
		}
		new_chandef = new_vht_chandef;
	}

1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180
	if (!cfg80211_chandef_usable(local->hw.wiphy, &new_chandef,
				     IEEE80211_CHAN_DISABLED)) {
		sdata_info(sdata,
			   "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
			   ifmgd->associated->bssid, new_freq,
			   new_chandef.width, new_chandef.center_freq1,
			   new_chandef.center_freq2);
		ieee80211_queue_work(&local->hw,
				     &ifmgd->csa_connection_drop_work);
		return;
	}

1181 1182
	ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;

1183
	if (local->use_chanctx) {
J
Johannes Berg 已提交
1184 1185
		sdata_info(sdata,
			   "not handling channel switch with channel contexts\n");
1186
		ieee80211_queue_work(&local->hw,
J
Johannes Berg 已提交
1187
				     &ifmgd->csa_connection_drop_work);
1188
		return;
J
Johannes Berg 已提交
1189 1190
	}

1191
	mutex_lock(&local->chanctx_mtx);
J
Johannes Berg 已提交
1192
	if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
1193
		mutex_unlock(&local->chanctx_mtx);
J
Johannes Berg 已提交
1194 1195 1196 1197 1198 1199 1200
		return;
	}
	chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
			       struct ieee80211_chanctx, conf);
	if (chanctx->refcount > 1) {
		sdata_info(sdata,
			   "channel switch with multiple interfaces on the same channel, disconnecting\n");
1201
		ieee80211_queue_work(&local->hw,
J
Johannes Berg 已提交
1202
				     &ifmgd->csa_connection_drop_work);
1203
		mutex_unlock(&local->chanctx_mtx);
J
Johannes Berg 已提交
1204 1205
		return;
	}
1206
	mutex_unlock(&local->chanctx_mtx);
J
Johannes Berg 已提交
1207

1208
	local->csa_chandef = new_chandef;
J
Johannes Berg 已提交
1209

1210 1211
	if (mode)
		ieee80211_stop_queues_by_reason(&local->hw,
1212
				IEEE80211_MAX_QUEUE_MAP,
1213 1214
				IEEE80211_QUEUE_STOP_REASON_CSA);

1215
	if (local->ops->channel_switch) {
1216
		/* use driver's channel switch callback */
1217 1218
		struct ieee80211_channel_switch ch_switch = {
			.timestamp = timestamp,
1219
			.block_tx = mode,
1220
			.chandef = new_chandef,
1221
			.count = count,
1222 1223
		};

1224
		drv_channel_switch(local, &ch_switch);
1225 1226 1227 1228
		return;
	}

	/* channel switch handled in software */
1229 1230
	if (count <= 1)
		ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1231
	else
1232
		mod_timer(&ifmgd->chswitch_timer,
1233
			  TU_TO_EXP_TIME(count * cbss->beacon_interval));
1234 1235
}

1236 1237 1238 1239
static u32 ieee80211_handle_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)
1240
{
1241 1242 1243 1244
	struct ieee80211_country_ie_triplet *triplet;
	int chan = ieee80211_frequency_to_channel(channel->center_freq);
	int i, chan_pwr, chan_increment, new_ap_level;
	bool have_chan_pwr = false;
1245

1246 1247
	/* Invalid IE */
	if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1248
		return 0;
1249

1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263
	triplet = (void *)(country_ie + 3);
	country_ie_len -= 3;

	switch (channel->band) {
	default:
		WARN_ON_ONCE(1);
		/* fall through */
	case IEEE80211_BAND_2GHZ:
	case IEEE80211_BAND_60GHZ:
		chan_increment = 1;
		break;
	case IEEE80211_BAND_5GHZ:
		chan_increment = 4;
		break;
1264
	}
1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288

	/* 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)
1289
		return 0;
1290 1291 1292

	new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);

1293 1294
	if (sdata->ap_power_level == new_ap_level)
		return 0;
1295 1296 1297 1298 1299

	sdata_info(sdata,
		   "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
		   new_ap_level, chan_pwr, *pwr_constr_elem,
		   sdata->u.mgd.bssid);
1300 1301 1302 1303
	sdata->ap_power_level = new_ap_level;
	if (__ieee80211_recalc_txpower(sdata))
		return BSS_CHANGED_TXPOWER;
	return 0;
1304 1305
}

1306 1307 1308 1309 1310 1311
/* powersave */
static void ieee80211_enable_ps(struct ieee80211_local *local,
				struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_conf *conf = &local->hw.conf;

J
Johannes Berg 已提交
1312 1313 1314 1315
	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
1316
	if (local->scanning)
J
Johannes Berg 已提交
1317 1318
		return;

1319 1320 1321 1322 1323 1324 1325
	if (conf->dynamic_ps_timeout > 0 &&
	    !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
		mod_timer(&local->dynamic_ps_timer, jiffies +
			  msecs_to_jiffies(conf->dynamic_ps_timeout));
	} else {
		if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
			ieee80211_send_nullfunc(local, sdata, 1);
1326

1327 1328 1329 1330 1331 1332
		if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
		    (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
			return;

		conf->flags |= IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349
	}
}

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);
	}
}

1350 1351 1352 1353
static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *mgd = &sdata->u.mgd;
	struct sta_info *sta = NULL;
J
Johannes Berg 已提交
1354
	bool authorized = false;
1355 1356 1357 1358

	if (!mgd->powersave)
		return false;

1359 1360 1361
	if (mgd->broken_ap)
		return false;

1362 1363 1364 1365 1366 1367 1368
	if (!mgd->associated)
		return false;

	if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
			  IEEE80211_STA_CONNECTION_POLL))
		return false;

1369
	if (!mgd->have_beacon)
1370 1371
		return false;

1372 1373 1374
	rcu_read_lock();
	sta = sta_info_get(sdata, mgd->bssid);
	if (sta)
J
Johannes Berg 已提交
1375
		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1376 1377
	rcu_read_unlock();

J
Johannes Berg 已提交
1378
	return authorized;
1379 1380
}

1381
/* need to hold RTNL or interface lock */
1382
void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1383 1384 1385
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;
1386
	int timeout;
1387 1388 1389 1390 1391 1392 1393

	if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
		local->ps_sdata = NULL;
		return;
	}

	list_for_each_entry(sdata, &local->interfaces, list) {
1394
		if (!ieee80211_sdata_running(sdata))
1395
			continue;
1396 1397 1398 1399 1400 1401 1402 1403
		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;
		}
1404 1405 1406 1407 1408 1409
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

1410
	if (count == 1 && ieee80211_powersave_allowed(found)) {
1411 1412 1413
		s32 beaconint_us;

		if (latency < 0)
M
Mark Gross 已提交
1414
			latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1415 1416 1417 1418

		beaconint_us = ieee80211_tu_to_usec(
					found->vif.bss_conf.beacon_int);

1419
		timeout = local->dynamic_ps_forced_timeout;
1420 1421
		if (timeout < 0) {
			/*
1422 1423
			 * Go to full PSM if the user configures a very low
			 * latency requirement.
1424 1425 1426
			 * The 2000 second value is there for compatibility
			 * until the PM_QOS_NETWORK_LATENCY is configured
			 * with real values.
1427
			 */
1428 1429
			if (latency > (1900 * USEC_PER_MSEC) &&
			    latency != (2000 * USEC_PER_SEC))
1430
				timeout = 0;
1431 1432
			else
				timeout = 100;
1433
		}
1434
		local->hw.conf.dynamic_ps_timeout = timeout;
1435

1436
		if (beaconint_us > latency) {
1437
			local->ps_sdata = NULL;
1438 1439
		} else {
			int maxslp = 1;
1440
			u8 dtimper = found->u.mgd.dtim_period;
1441 1442 1443 1444 1445

			/* If the TIM IE is invalid, pretend the value is 1 */
			if (!dtimper)
				dtimper = 1;
			else if (dtimper > 1)
1446 1447 1448
				maxslp = min_t(int, dtimper,
						    latency / beaconint_us);

1449
			local->hw.conf.max_sleep_period = maxslp;
1450
			local->hw.conf.ps_dtim_period = dtimper;
1451
			local->ps_sdata = found;
1452
		}
1453
	} else {
1454
		local->ps_sdata = NULL;
1455
	}
1456 1457 1458 1459

	ieee80211_change_ps(local);
}

E
Eliad Peller 已提交
1460 1461 1462 1463 1464 1465 1466 1467 1468 1469
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);
	}
}

1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481
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,
1482
					IEEE80211_MAX_QUEUE_MAP,
1483 1484 1485 1486 1487 1488 1489 1490 1491
					IEEE80211_QUEUE_STOP_REASON_PS);
}

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;
1492
	struct ieee80211_if_managed *ifmgd;
1493 1494
	unsigned long flags;
	int q;
1495 1496 1497 1498 1499

	/* can only happen when PS was just disabled anyway */
	if (!sdata)
		return;

1500 1501
	ifmgd = &sdata->u.mgd;

1502 1503 1504
	if (local->hw.conf.flags & IEEE80211_CONF_PS)
		return;

1505
	if (local->hw.conf.dynamic_ps_timeout > 0) {
1506 1507
		/* don't enter PS if TX frames are pending */
		if (drv_tx_frames_pending(local)) {
1508 1509 1510 1511 1512
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
			return;
		}
1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530

		/*
		 * 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);
1531 1532
	}

1533
	if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1534
	    !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1535
		if (drv_tx_frames_pending(local)) {
1536 1537 1538
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
1539
		} else {
1540 1541
			ieee80211_send_nullfunc(local, sdata, 1);
			/* Flush to get the tx status of nullfunc frame */
1542
			ieee80211_flush_queues(local, sdata);
1543
		}
1544 1545
	}

1546 1547
	if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
	      (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1548 1549 1550 1551 1552
	    (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);
	}
1553 1554 1555 1556 1557 1558
}

void ieee80211_dynamic_ps_timer(unsigned long data)
{
	struct ieee80211_local *local = (void *) data;

1559
	if (local->quiescing || local->suspended)
1560 1561
		return;

1562
	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1563 1564
}

1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577
void ieee80211_dfs_cac_timer_work(struct work_struct *work)
{
	struct delayed_work *delayed_work =
		container_of(work, struct delayed_work, work);
	struct ieee80211_sub_if_data *sdata =
		container_of(delayed_work, struct ieee80211_sub_if_data,
			     dfs_cac_timer_work);

	ieee80211_vif_release_channel(sdata);

	cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_FINISHED, GFP_KERNEL);
}

J
Johannes Berg 已提交
1578
/* MLME */
1579
static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1580
				     struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
1581
				     const u8 *wmm_param, size_t wmm_param_len)
1582 1583
{
	struct ieee80211_tx_queue_params params;
1584
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1585 1586
	size_t left;
	int count;
J
Johannes Berg 已提交
1587 1588
	const u8 *pos;
	u8 uapsd_queues = 0;
1589

1590
	if (!local->ops->conf_tx)
1591
		return false;
1592

J
Johannes Berg 已提交
1593
	if (local->hw.queues < IEEE80211_NUM_ACS)
1594
		return false;
1595 1596

	if (!wmm_param)
1597
		return false;
1598

1599
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1600
		return false;
K
Kalle Valo 已提交
1601 1602

	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1603
		uapsd_queues = ifmgd->uapsd_queues;
K
Kalle Valo 已提交
1604

1605
	count = wmm_param[6] & 0x0f;
1606
	if (count == ifmgd->wmm_last_param_set)
1607
		return false;
1608
	ifmgd->wmm_last_param_set = count;
1609 1610 1611 1612 1613 1614

	pos = wmm_param + 8;
	left = wmm_param_len - 8;

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

Y
Yoni Divinsky 已提交
1615
	sdata->wmm_acm = 0;
1616 1617 1618
	for (; left >= 4; left -= 4, pos += 4) {
		int aci = (pos[0] >> 5) & 0x03;
		int acm = (pos[0] >> 4) & 0x01;
K
Kalle Valo 已提交
1619
		bool uapsd = false;
1620 1621 1622
		int queue;

		switch (aci) {
1623
		case 1: /* AC_BK */
J
Johannes Berg 已提交
1624
			queue = 3;
J
Johannes Berg 已提交
1625
			if (acm)
Y
Yoni Divinsky 已提交
1626
				sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
K
Kalle Valo 已提交
1627 1628
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
				uapsd = true;
1629
			break;
1630
		case 2: /* AC_VI */
J
Johannes Berg 已提交
1631
			queue = 1;
J
Johannes Berg 已提交
1632
			if (acm)
Y
Yoni Divinsky 已提交
1633
				sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
K
Kalle Valo 已提交
1634 1635
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
				uapsd = true;
1636
			break;
1637
		case 3: /* AC_VO */
J
Johannes Berg 已提交
1638
			queue = 0;
J
Johannes Berg 已提交
1639
			if (acm)
Y
Yoni Divinsky 已提交
1640
				sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
K
Kalle Valo 已提交
1641 1642
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
				uapsd = true;
1643
			break;
1644
		case 0: /* AC_BE */
1645
		default:
J
Johannes Berg 已提交
1646
			queue = 2;
J
Johannes Berg 已提交
1647
			if (acm)
Y
Yoni Divinsky 已提交
1648
				sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
K
Kalle Valo 已提交
1649 1650
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
				uapsd = true;
1651 1652 1653 1654 1655 1656
			break;
		}

		params.aifs = pos[0] & 0x0f;
		params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params.cw_min = ecw2cw(pos[1] & 0x0f);
1657
		params.txop = get_unaligned_le16(pos + 2);
1658
		params.acm = acm;
K
Kalle Valo 已提交
1659 1660
		params.uapsd = uapsd;

J
Johannes Berg 已提交
1661 1662 1663 1664 1665
		mlme_dbg(sdata,
			 "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
			 queue, aci, acm,
			 params.aifs, params.cw_min, params.cw_max,
			 params.txop, params.uapsd);
1666 1667
		sdata->tx_conf[queue] = params;
		if (drv_conf_tx(local, sdata, queue, &params))
J
Johannes Berg 已提交
1668 1669 1670
			sdata_err(sdata,
				  "failed to set TX queue parameters for queue %d\n",
				  queue);
1671
	}
1672 1673

	/* enable WMM or activate new settings */
1674
	sdata->vif.bss_conf.qos = true;
1675
	return true;
1676 1677
}

1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693
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_STA_BEACON_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);
}

J
Johannes Berg 已提交
1694 1695
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
1696
{
J
Johannes Berg 已提交
1697
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1698
	u32 changed = 0;
J
Johannes Berg 已提交
1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711
	bool use_protection;
	bool use_short_preamble;
	bool use_short_slot;

	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);
J
Johannes Berg 已提交
1712
	if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1713
		use_short_slot = true;
1714

1715 1716 1717
	if (use_protection != bss_conf->use_cts_prot) {
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
1718
	}
1719

1720 1721
	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
1722
		changed |= BSS_CHANGED_ERP_PREAMBLE;
1723
	}
1724

J
Johannes Berg 已提交
1725 1726 1727
	if (use_short_slot != bss_conf->use_short_slot) {
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
1728 1729 1730 1731 1732
	}

	return changed;
}

1733
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1734
				     struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
1735
				     u32 bss_info_changed)
1736
{
1737
	struct ieee80211_bss *bss = (void *)cbss->priv;
1738
	struct ieee80211_local *local = sdata->local;
1739
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1740

J
Johannes Berg 已提交
1741
	bss_info_changed |= BSS_CHANGED_ASSOC;
1742
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1743
		bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1744

1745
	sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1746
		beacon_loss_count * bss_conf->beacon_int));
1747

1748 1749
	sdata->u.mgd.associated = cbss;
	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1750

1751 1752
	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;

1753
	if (sdata->vif.p2p) {
1754
		const struct cfg80211_bss_ies *ies;
1755

1756 1757 1758 1759 1760 1761 1762 1763
		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,
J
Janusz Dziedzic 已提交
1764 1765
					(u8 *) &bss_conf->p2p_noa_attr,
					sizeof(bss_conf->p2p_noa_attr));
1766
			if (ret >= 2) {
J
Janusz Dziedzic 已提交
1767 1768
				sdata->u.mgd.p2p_noa_index =
					bss_conf->p2p_noa_attr.index;
1769 1770
				bss_info_changed |= BSS_CHANGED_P2P_PS;
			}
1771
		}
1772
		rcu_read_unlock();
1773 1774
	}

J
Johannes Berg 已提交
1775
	/* just to be sure */
1776
	ieee80211_stop_poll(sdata);
J
Johannes Berg 已提交
1777

1778
	ieee80211_led_assoc(local, 1);
1779

1780
	if (sdata->u.mgd.have_beacon) {
1781 1782 1783 1784 1785 1786 1787
		/*
		 * 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;
1788
		bss_conf->beacon_rate = bss->beacon_rate;
1789
		bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1790
	} else {
1791
		bss_conf->beacon_rate = NULL;
1792
		bss_conf->dtim_period = 0;
1793
	}
1794

1795
	bss_conf->assoc = 1;
1796

1797
	/* Tell the driver to monitor connection quality (if supported) */
1798
	if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1799
	    bss_conf->cqm_rssi_thold)
1800 1801
		bss_info_changed |= BSS_CHANGED_CQM;

1802
	/* Enable ARP filtering */
1803
	if (bss_conf->arp_addr_cnt)
1804 1805
		bss_info_changed |= BSS_CHANGED_ARP_FILTER;

J
Johannes Berg 已提交
1806
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1807

J
Johannes Berg 已提交
1808 1809 1810
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
	mutex_unlock(&local->iflist_mtx);
1811

1812
	ieee80211_recalc_smps(sdata);
E
Eliad Peller 已提交
1813 1814
	ieee80211_recalc_ps_vif(sdata);

1815
	netif_carrier_on(sdata->dev);
1816 1817
}

1818
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1819 1820
				   u16 stype, u16 reason, bool tx,
				   u8 *frame_buf)
1821
{
1822
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1823
	struct ieee80211_local *local = sdata->local;
1824
	u32 changed = 0;
1825

1826
	sdata_assert_lock(sdata);
1827

1828 1829 1830
	if (WARN_ON_ONCE(tx && !frame_buf))
		return;

J
Johannes Berg 已提交
1831 1832 1833
	if (WARN_ON(!ifmgd->associated))
		return;

1834 1835
	ieee80211_stop_poll(sdata);

1836
	ifmgd->associated = NULL;
1837 1838
	netif_carrier_off(sdata->dev);

1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849
	/*
	 * 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;

E
Eliad Peller 已提交
1850 1851 1852
	/* disable per-vif ps */
	ieee80211_recalc_ps_vif(sdata);

1853 1854
	/* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
	if (tx)
1855
		ieee80211_flush_queues(local, sdata);
1856

1857 1858
	/* deauthenticate/disassociate now */
	if (tx || frame_buf)
1859 1860
		ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
					       reason, tx, frame_buf);
1861 1862 1863

	/* flush out frame */
	if (tx)
1864
		ieee80211_flush_queues(local, sdata);
1865

1866 1867 1868
	/* clear bssid only after building the needed mgmt frames */
	memset(ifmgd->bssid, 0, ETH_ALEN);

1869
	/* remove AP and TDLS peers */
1870
	sta_info_flush_defer(sdata);
1871 1872

	/* finally reset all BSS / config parameters */
1873 1874 1875
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
J
Johannes Berg 已提交
1876 1877
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
1878

J
Janusz Dziedzic 已提交
1879 1880 1881
	ifmgd->p2p_noa_index = -1;
	memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
	       sizeof(sdata->vif.bss_conf.p2p_noa_attr));
1882

1883
	/* on the next assoc, re-program HT/VHT parameters */
B
Ben Greear 已提交
1884 1885
	memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
	memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1886 1887
	memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
	memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
1888

1889
	sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1890

1891 1892 1893
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

1894
	/* Disable ARP filtering */
1895
	if (sdata->vif.bss_conf.arp_addr_cnt)
1896 1897
		changed |= BSS_CHANGED_ARP_FILTER;

1898 1899 1900
	sdata->vif.bss_conf.qos = false;
	changed |= BSS_CHANGED_QOS;

1901 1902
	/* The BSSID (not really interesting) and HT changed */
	changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
J
Johannes Berg 已提交
1903
	ieee80211_bss_info_change_notify(sdata, changed);
1904

1905 1906 1907
	/* disassociated - set to defaults now */
	ieee80211_set_wmm_default(sdata, false);

1908 1909 1910 1911
	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);
1912

1913
	sdata->vif.bss_conf.dtim_period = 0;
1914 1915
	sdata->vif.bss_conf.beacon_rate = NULL;

1916
	ifmgd->have_beacon = false;
1917

1918 1919
	ifmgd->flags = 0;
	ieee80211_vif_release_channel(sdata);
1920
}
1921

1922 1923 1924 1925 1926 1927 1928 1929
void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
			     struct ieee80211_hdr *hdr)
{
	/*
	 * We can postpone the mgd.timer whenever receiving unicast frames
	 * from AP because we know that the connection is working both ways
	 * at that time. But multicast frames (and hence also beacons) must
	 * be ignored here, because we need to trigger the timer during
J
Johannes Berg 已提交
1930 1931
	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
1932
	 */
J
Johannes Berg 已提交
1933 1934 1935
	if (is_multicast_ether_addr(hdr->addr1))
		return;

1936
	ieee80211_sta_reset_conn_monitor(sdata);
1937
}
1938

1939 1940 1941
static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1942
	struct ieee80211_local *local = sdata->local;
1943

1944
	mutex_lock(&local->mtx);
1945
	if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1946 1947 1948 1949
			      IEEE80211_STA_CONNECTION_POLL))) {
		mutex_unlock(&local->mtx);
		return;
	}
1950

1951
	__ieee80211_stop_poll(sdata);
1952 1953 1954 1955

	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
	mutex_unlock(&local->iflist_mtx);
1956 1957

	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1958
		goto out;
1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969

	/*
	 * 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));
1970 1971
out:
	mutex_unlock(&local->mtx);
1972 1973 1974
}

void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1975
			     struct ieee80211_hdr *hdr, bool ack)
1976
{
F
Felix Fietkau 已提交
1977
	if (!ieee80211_is_data(hdr->frame_control))
1978 1979 1980 1981
	    return;

	if (ieee80211_is_nullfunc(hdr->frame_control) &&
	    sdata->u.mgd.probe_send_count > 0) {
1982
		if (ack)
1983
			ieee80211_sta_reset_conn_monitor(sdata);
1984 1985
		else
			sdata->u.mgd.nullfunc_failed = true;
1986
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1987
		return;
1988
	}
1989 1990 1991

	if (ack)
		ieee80211_sta_reset_conn_monitor(sdata);
1992 1993
}

1994 1995 1996 1997
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ssid;
1998
	u8 *dst = ifmgd->associated->bssid;
1999
	u8 unicast_limit = max(1, max_probe_tries - 3);
2000 2001 2002 2003 2004 2005 2006 2007

	/*
	 * 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;
2008

2009 2010 2011 2012 2013 2014 2015
	/*
	 * 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.
	 */
2016 2017
	ifmgd->probe_send_count++;

2018 2019
	if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
		ifmgd->nullfunc_failed = false;
2020
		ieee80211_send_nullfunc(sdata->local, sdata, 0);
2021
	} else {
2022 2023
		int ssid_len;

2024
		rcu_read_lock();
2025
		ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2026 2027 2028 2029 2030 2031
		if (WARN_ON_ONCE(ssid == NULL))
			ssid_len = 0;
		else
			ssid_len = ssid[1];

		ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
2032
					 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
2033
					 ifmgd->associated->channel, false);
2034
		rcu_read_unlock();
2035
	}
2036

2037
	ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2038
	run_again(sdata, ifmgd->probe_timeout);
2039
	if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2040
		ieee80211_flush_queues(sdata->local, sdata);
2041 2042
}

J
Johannes Berg 已提交
2043 2044
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
				   bool beacon)
2045 2046
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
2047
	bool already = false;
2048

2049
	if (!ieee80211_sdata_running(sdata))
2050 2051
		return;

2052
	sdata_lock(sdata);
2053 2054 2055 2056

	if (!ifmgd->associated)
		goto out;

2057 2058 2059 2060 2061 2062 2063
	mutex_lock(&sdata->local->mtx);

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

2064
	if (beacon) {
J
Johannes Berg 已提交
2065
		mlme_dbg_ratelimited(sdata,
2066 2067
				     "detected beacon loss from AP (missed %d beacons) - probing\n",
				     beacon_loss_count);
J
Johannes Berg 已提交
2068

2069 2070 2071 2072
		ieee80211_cqm_rssi_notify(&sdata->vif,
					  NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
					  GFP_KERNEL);
	}
2073

J
Johannes Berg 已提交
2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093
	/*
	 * 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_BEACON_POLL |
			    IEEE80211_STA_CONNECTION_POLL))
		already = true;

	if (beacon)
		ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
	else
		ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;

2094 2095
	mutex_unlock(&sdata->local->mtx);

J
Johannes Berg 已提交
2096 2097 2098
	if (already)
		goto out;

2099 2100 2101 2102
	mutex_lock(&sdata->local->iflist_mtx);
	ieee80211_recalc_ps(sdata->local, -1);
	mutex_unlock(&sdata->local->iflist_mtx);

2103 2104
	ifmgd->probe_send_count = 0;
	ieee80211_mgd_probe_ap_send(sdata);
2105
 out:
2106
	sdata_unlock(sdata);
2107 2108
}

2109 2110 2111 2112 2113
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;
2114
	struct cfg80211_bss *cbss;
2115 2116
	struct sk_buff *skb;
	const u8 *ssid;
2117
	int ssid_len;
2118 2119 2120 2121

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

2122
	sdata_assert_lock(sdata);
2123

2124 2125 2126 2127 2128 2129 2130
	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
2131 2132
		return NULL;

2133
	rcu_read_lock();
2134
	ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2135 2136 2137 2138 2139
	if (WARN_ON_ONCE(ssid == NULL))
		ssid_len = 0;
	else
		ssid_len = ssid[1];

2140
	skb = ieee80211_build_probe_req(sdata, cbss->bssid,
J
Johannes Berg 已提交
2141
					(u32) -1, cbss->channel,
2142
					ssid + 2, ssid_len,
2143
					NULL, 0, true);
2144
	rcu_read_unlock();
2145 2146 2147 2148 2149

	return skb;
}
EXPORT_SYMBOL(ieee80211_ap_probereq_get);

2150
static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2151 2152
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2153
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2154

2155
	sdata_lock(sdata);
2156
	if (!ifmgd->associated) {
2157
		sdata_unlock(sdata);
2158 2159 2160
		return;
	}

2161 2162
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
			       WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2163
			       true, frame_buf);
2164
	ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
2165
	ieee80211_wake_queues_by_reason(&sdata->local->hw,
2166
					IEEE80211_MAX_QUEUE_MAP,
2167
					IEEE80211_QUEUE_STOP_REASON_CSA);
2168

2169 2170
	cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
			      IEEE80211_DEAUTH_FRAME_LEN);
2171
	sdata_unlock(sdata);
2172 2173
}

2174
static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
J
Johannes Berg 已提交
2175 2176 2177
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
2178
			     u.mgd.beacon_connection_loss_work);
2179 2180 2181 2182
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct sta_info *sta;

	if (ifmgd->associated) {
2183
		rcu_read_lock();
2184 2185 2186
		sta = sta_info_get(sdata, ifmgd->bssid);
		if (sta)
			sta->beacon_loss_count++;
2187
		rcu_read_unlock();
2188
	}
J
Johannes Berg 已提交
2189

2190
	if (ifmgd->connection_loss) {
2191 2192
		sdata_info(sdata, "Connection to AP %pM lost\n",
			   ifmgd->bssid);
2193
		__ieee80211_disconnect(sdata);
2194
	} else {
2195
		ieee80211_mgd_probe_ap(sdata, true);
2196 2197 2198 2199 2200 2201 2202 2203 2204
	}
}

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);

2205
	__ieee80211_disconnect(sdata);
J
Johannes Berg 已提交
2206 2207
}

2208 2209 2210
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2211
	struct ieee80211_hw *hw = &sdata->local->hw;
2212

J
Johannes Berg 已提交
2213 2214
	trace_api_beacon_loss(sdata);

2215
	sdata->u.mgd.connection_loss = false;
2216
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2217 2218 2219
}
EXPORT_SYMBOL(ieee80211_beacon_loss);

2220 2221 2222 2223 2224
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;

J
Johannes Berg 已提交
2225 2226
	trace_api_connection_loss(sdata);

2227
	sdata->u.mgd.connection_loss = true;
2228 2229 2230 2231 2232
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_connection_loss);


J
Johannes Berg 已提交
2233 2234 2235 2236 2237
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;

2238
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2239 2240 2241 2242 2243 2244

	if (!assoc) {
		sta_info_destroy_addr(sdata, auth_data->bss->bssid);

		memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2245
		sdata->u.mgd.flags = 0;
J
Johannes Berg 已提交
2246
		ieee80211_vif_release_channel(sdata);
J
Johannes Berg 已提交
2247 2248
	}

2249
	cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
J
Johannes Berg 已提交
2250 2251 2252 2253 2254 2255 2256
	kfree(auth_data);
	sdata->u.mgd.auth_data = NULL;
}

static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
{
2257
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
2258 2259 2260
	struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
	u8 *pos;
	struct ieee802_11_elems elems;
2261
	u32 tx_flags = 0;
J
Johannes Berg 已提交
2262 2263

	pos = mgmt->u.auth.variable;
2264
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2265 2266 2267
	if (!elems.challenge)
		return;
	auth_data->expected_transaction = 4;
J
Johannes Berg 已提交
2268
	drv_mgd_prepare_tx(sdata->local, sdata);
2269 2270 2271
	if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
		tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
			   IEEE80211_TX_INTFL_MLME_CONN_TX;
2272
	ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
J
Johannes Berg 已提交
2273 2274 2275
			    elems.challenge - 2, elems.challenge_len + 2,
			    auth_data->bss->bssid, auth_data->bss->bssid,
			    auth_data->key, auth_data->key_len,
2276
			    auth_data->key_idx, tx_flags);
J
Johannes Berg 已提交
2277 2278
}

2279 2280
static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_mgmt *mgmt, size_t len)
J
Johannes Berg 已提交
2281 2282 2283 2284 2285 2286
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u8 bssid[ETH_ALEN];
	u16 auth_alg, auth_transaction, status_code;
	struct sta_info *sta;

2287
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2288 2289

	if (len < 24 + 6)
2290
		return;
J
Johannes Berg 已提交
2291 2292

	if (!ifmgd->auth_data || ifmgd->auth_data->done)
2293
		return;
J
Johannes Berg 已提交
2294 2295 2296

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

2297
	if (!ether_addr_equal(bssid, mgmt->bssid))
2298
		return;
J
Johannes Berg 已提交
2299 2300 2301 2302 2303 2304

	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 ||
2305 2306 2307 2308 2309
	    auth_transaction != ifmgd->auth_data->expected_transaction) {
		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);
2310
		return;
2311
	}
J
Johannes Berg 已提交
2312 2313

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
2314 2315
		sdata_info(sdata, "%pM denied authentication (status %d)\n",
			   mgmt->sa, status_code);
2316
		ieee80211_destroy_auth_data(sdata, false);
2317
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2318
		return;
J
Johannes Berg 已提交
2319 2320 2321 2322 2323 2324
	}

	switch (ifmgd->auth_data->algorithm) {
	case WLAN_AUTH_OPEN:
	case WLAN_AUTH_LEAP:
	case WLAN_AUTH_FT:
2325
	case WLAN_AUTH_SAE:
J
Johannes Berg 已提交
2326 2327 2328 2329 2330
		break;
	case WLAN_AUTH_SHARED_KEY:
		if (ifmgd->auth_data->expected_transaction != 4) {
			ieee80211_auth_challenge(sdata, mgmt, len);
			/* need another frame */
2331
			return;
J
Johannes Berg 已提交
2332 2333 2334 2335 2336
		}
		break;
	default:
		WARN_ONCE(1, "invalid auth alg %d",
			  ifmgd->auth_data->algorithm);
2337
		return;
J
Johannes Berg 已提交
2338 2339
	}

J
Johannes Berg 已提交
2340
	sdata_info(sdata, "authenticated\n");
J
Johannes Berg 已提交
2341 2342
	ifmgd->auth_data->done = true;
	ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2343
	ifmgd->auth_data->timeout_started = true;
2344
	run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
2345

2346 2347 2348 2349 2350 2351
	if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
	    ifmgd->auth_data->expected_transaction != 2) {
		/*
		 * Report auth frame to user space for processing since another
		 * round of Authentication frames is still needed.
		 */
2352
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2353
		return;
2354 2355
	}

J
Johannes Berg 已提交
2356 2357 2358 2359 2360 2361 2362 2363
	/* 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);
		goto out_err;
	}
	if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
J
Johannes Berg 已提交
2364
		sdata_info(sdata, "failed moving %pM to auth\n", bssid);
J
Johannes Berg 已提交
2365 2366 2367 2368
		goto out_err;
	}
	mutex_unlock(&sdata->local->sta_mtx);

2369
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2370
	return;
J
Johannes Berg 已提交
2371 2372 2373 2374 2375 2376
 out_err:
	mutex_unlock(&sdata->local->sta_mtx);
	/* ignore frame -- wait for timeout */
}


2377 2378
static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
2379
{
2380
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2381
	const u8 *bssid = NULL;
2382 2383
	u16 reason_code;

2384
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2385

2386
	if (len < 24 + 2)
2387
		return;
2388

J
Johannes Berg 已提交
2389
	if (!ifmgd->associated ||
2390
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2391
		return;
2392

2393
	bssid = ifmgd->associated->bssid;
2394 2395 2396

	reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);

J
Johannes Berg 已提交
2397 2398
	sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
		   bssid, reason_code);
2399

2400 2401
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2402
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2403 2404 2405
}


2406 2407
static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_mgmt *mgmt, size_t len)
2408
{
2409
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2410 2411
	u16 reason_code;

2412
	sdata_assert_lock(sdata);
2413

J
Johannes Berg 已提交
2414
	if (len < 24 + 2)
2415
		return;
2416

J
Johannes Berg 已提交
2417
	if (!ifmgd->associated ||
2418
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2419
		return;
2420 2421 2422

	reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);

J
Johannes Berg 已提交
2423 2424
	sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
		   mgmt->sa, reason_code);
2425

2426 2427
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2428
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2429 2430
}

2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471
static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
				u8 *supp_rates, unsigned int supp_rates_len,
				u32 *rates, u32 *basic_rates,
				bool *have_higher_than_11mbit,
				int *min_rate, int *min_rate_index)
{
	int i, j;

	for (i = 0; i < supp_rates_len; i++) {
		int rate = (supp_rates[i] & 0x7f) * 5;
		bool is_basic = !!(supp_rates[i] & 0x80);

		if (rate > 110)
			*have_higher_than_11mbit = true;

		/*
		 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
		 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
		 *
		 * Note: Even through the membership selector and the basic
		 *	 rate flag share the same bit, they are not exactly
		 *	 the same.
		 */
		if (!!(supp_rates[i] & 0x80) &&
		    (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
			continue;

		for (j = 0; j < sband->n_bitrates; j++) {
			if (sband->bitrates[j].bitrate == rate) {
				*rates |= BIT(j);
				if (is_basic)
					*basic_rates |= BIT(j);
				if (rate < *min_rate) {
					*min_rate = rate;
					*min_rate_index = j;
				}
				break;
			}
		}
	}
}
2472

J
Johannes Berg 已提交
2473 2474 2475 2476 2477
static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
					 bool assoc)
{
	struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;

2478
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2479 2480 2481 2482 2483 2484

	if (!assoc) {
		sta_info_destroy_addr(sdata, assoc_data->bss->bssid);

		memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2485
		sdata->u.mgd.flags = 0;
J
Johannes Berg 已提交
2486
		ieee80211_vif_release_channel(sdata);
J
Johannes Berg 已提交
2487 2488 2489 2490 2491 2492 2493 2494
	}

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

static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
				    struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
2495
				    struct ieee80211_mgmt *mgmt, size_t len)
2496
{
2497
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2498
	struct ieee80211_local *local = sdata->local;
2499
	struct ieee80211_supported_band *sband;
2500
	struct sta_info *sta;
J
Johannes Berg 已提交
2501 2502
	u8 *pos;
	u16 capab_info, aid;
2503
	struct ieee802_11_elems elems;
J
Johannes Berg 已提交
2504
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2505 2506
	const struct cfg80211_bss_ies *bss_ies = NULL;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
J
Johannes Berg 已提交
2507
	u32 changed = 0;
2508
	int err;
2509
	bool ret;
2510

J
Johannes Berg 已提交
2511
	/* AssocResp and ReassocResp have identical structure */
2512 2513

	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
J
Johannes Berg 已提交
2514
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2515

2516
	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
J
Johannes Berg 已提交
2517 2518
		sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
			   aid);
2519 2520
	aid &= ~(BIT(15) | BIT(14));

2521 2522 2523
	ifmgd->broken_ap = false;

	if (aid == 0 || aid > IEEE80211_MAX_AID) {
J
Johannes Berg 已提交
2524 2525
		sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
			   aid);
2526 2527 2528 2529
		aid = 0;
		ifmgd->broken_ap = true;
	}

J
Johannes Berg 已提交
2530
	pos = mgmt->u.assoc_resp.variable;
2531
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2532

2533
	if (!elems.supp_rates) {
J
Johannes Berg 已提交
2534
		sdata_info(sdata, "no SuppRates element in AssocResp\n");
J
Johannes Berg 已提交
2535
		return false;
2536 2537
	}

2538
	ifmgd->aid = aid;
2539

2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602
	/*
	 * Some APs are erroneously not including some information in their
	 * (re)association response frames. Try to recover by using the data
	 * from the beacon or probe response. This seems to afflict mobile
	 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
	 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
	 */
	if ((assoc_data->wmm && !elems.wmm_param) ||
	    (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	     (!elems.ht_cap_elem || !elems.ht_operation)) ||
	    (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	     (!elems.vht_cap_elem || !elems.vht_operation))) {
		const struct cfg80211_bss_ies *ies;
		struct ieee802_11_elems bss_elems;

		rcu_read_lock();
		ies = rcu_dereference(cbss->ies);
		if (ies)
			bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
					  GFP_ATOMIC);
		rcu_read_unlock();
		if (!bss_ies)
			return false;

		ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
				       false, &bss_elems);
		if (assoc_data->wmm &&
		    !elems.wmm_param && bss_elems.wmm_param) {
			elems.wmm_param = bss_elems.wmm_param;
			sdata_info(sdata,
				   "AP bug: WMM param missing from AssocResp\n");
		}

		/*
		 * Also check if we requested HT/VHT, otherwise the AP doesn't
		 * have to include the IEs in the (re)association response.
		 */
		if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
			elems.ht_cap_elem = bss_elems.ht_cap_elem;
			sdata_info(sdata,
				   "AP bug: HT capability missing from AssocResp\n");
		}
		if (!elems.ht_operation && bss_elems.ht_operation &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
			elems.ht_operation = bss_elems.ht_operation;
			sdata_info(sdata,
				   "AP bug: HT operation missing from AssocResp\n");
		}
		if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
			elems.vht_cap_elem = bss_elems.vht_cap_elem;
			sdata_info(sdata,
				   "AP bug: VHT capa missing from AssocResp\n");
		}
		if (!elems.vht_operation && bss_elems.vht_operation &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
			elems.vht_operation = bss_elems.vht_operation;
			sdata_info(sdata,
				   "AP bug: VHT operation missing from AssocResp\n");
		}
	}

2603 2604 2605 2606 2607 2608 2609
	/*
	 * We previously checked these in the beacon/probe response, so
	 * they should be present here. This is just a safety net.
	 */
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	    (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
		sdata_info(sdata,
2610 2611 2612
			   "HT AP is missing WMM params or HT capability/operation\n");
		ret = false;
		goto out;
2613 2614 2615 2616 2617
	}

	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    (!elems.vht_cap_elem || !elems.vht_operation)) {
		sdata_info(sdata,
2618 2619 2620
			   "VHT AP is missing VHT capability/operation\n");
		ret = false;
		goto out;
2621 2622
	}

2623 2624 2625 2626 2627
	mutex_lock(&sdata->local->sta_mtx);
	/*
	 * station info was already allocated and inserted before
	 * the association and should be available to us
	 */
2628
	sta = sta_info_get(sdata, cbss->bssid);
2629 2630
	if (WARN_ON(!sta)) {
		mutex_unlock(&sdata->local->sta_mtx);
2631 2632
		ret = false;
		goto out;
2633
	}
2634

J
Johannes Berg 已提交
2635
	sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2636

2637
	/* Set up internal HT/VHT capabilities */
2638
	if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
B
Ben Greear 已提交
2639
		ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2640
						  elems.ht_cap_elem, sta);
2641

M
Mahesh Palivela 已提交
2642 2643
	if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
		ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2644
						    elems.vht_cap_elem, sta);
M
Mahesh Palivela 已提交
2645

2646 2647 2648 2649 2650 2651
	/*
	 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
	 * in their association response, so ignore that data for our own
	 * configuration. If it changed since the last beacon, we'll get the
	 * next beacon and update then.
	 */
2652

2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667
	/*
	 * If an operating mode notification IE is present, override the
	 * NSS calculation (that would be done in rate_control_rate_init())
	 * and use the # of streams from that element.
	 */
	if (elems.opmode_notif &&
	    !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
		u8 nss;

		nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
		nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
		nss += 1;
		sta->sta.rx_nss = nss;
	}

2668
	rate_control_rate_init(sta);
2669

2670
	if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
J
Johannes Berg 已提交
2671
		set_sta_flag(sta, WLAN_STA_MFP);
2672

2673
	if (elems.wmm_param)
J
Johannes Berg 已提交
2674
		set_sta_flag(sta, WLAN_STA_WME);
2675

2676
	err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2677 2678 2679
	if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
		err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
	if (err) {
J
Johannes Berg 已提交
2680 2681 2682
		sdata_info(sdata,
			   "failed to move station %pM to desired state\n",
			   sta->sta.addr);
2683 2684
		WARN_ON(__sta_info_destroy(sta));
		mutex_unlock(&sdata->local->sta_mtx);
2685 2686
		ret = false;
		goto out;
2687 2688
	}

2689
	mutex_unlock(&sdata->local->sta_mtx);
2690

2691 2692 2693 2694 2695 2696 2697 2698
	/*
	 * Always handle WMM once after association regardless
	 * of the first value the AP uses. Setting -1 here has
	 * that effect because the AP values is an unsigned
	 * 4-bit value.
	 */
	ifmgd->wmm_last_param_set = -1;

2699
	if (elems.wmm_param)
2700
		ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
J
Johannes Berg 已提交
2701
					 elems.wmm_param_len);
2702
	else
2703 2704
		ieee80211_set_wmm_default(sdata, false);
	changed |= BSS_CHANGED_QOS;
2705

J
Johannes Berg 已提交
2706 2707 2708 2709
	/* set AID and assoc capability,
	 * ieee80211_set_associated() will tell the driver */
	bss_conf->aid = aid;
	bss_conf->assoc_capability = capab_info;
2710
	ieee80211_set_associated(sdata, cbss, changed);
2711

2712 2713 2714 2715 2716 2717 2718
	/*
	 * If we're using 4-addr mode, let the AP know that we're
	 * doing so, so that it can create the STA VLAN on its side
	 */
	if (ifmgd->use_4addr)
		ieee80211_send_4addr_nullfunc(local, sdata);

2719
	/*
J
Johannes Berg 已提交
2720 2721
	 * Start timer to probe the connection to the AP now.
	 * Also start the timer that will detect beacon loss.
2722
	 */
J
Johannes Berg 已提交
2723
	ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2724
	ieee80211_sta_reset_beacon_monitor(sdata);
2725

2726 2727 2728 2729
	ret = true;
 out:
	kfree(bss_ies);
	return ret;
2730 2731
}

2732 2733 2734
static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
					 struct ieee80211_mgmt *mgmt,
					 size_t len)
J
Johannes Berg 已提交
2735 2736 2737 2738 2739 2740 2741
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
	u16 capab_info, status_code, aid;
	struct ieee802_11_elems elems;
	u8 *pos;
	bool reassoc;
2742
	struct cfg80211_bss *bss;
J
Johannes Berg 已提交
2743

2744
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2745 2746

	if (!assoc_data)
2747
		return;
2748
	if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2749
		return;
J
Johannes Berg 已提交
2750 2751 2752 2753 2754 2755 2756

	/*
	 * AssocResp and ReassocResp have identical structure, so process both
	 * of them in this function.
	 */

	if (len < 24 + 6)
2757
		return;
J
Johannes Berg 已提交
2758 2759 2760 2761 2762 2763

	reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
	status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);

J
Johannes Berg 已提交
2764 2765 2766 2767
	sdata_info(sdata,
		   "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
		   reassoc ? "Rea" : "A", mgmt->sa,
		   capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
J
Johannes Berg 已提交
2768 2769

	pos = mgmt->u.assoc_resp.variable;
2770
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2771 2772

	if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2773 2774
	    elems.timeout_int &&
	    elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
J
Johannes Berg 已提交
2775
		u32 tu, ms;
2776
		tu = le32_to_cpu(elems.timeout_int->value);
J
Johannes Berg 已提交
2777
		ms = tu * 1024 / 1000;
J
Johannes Berg 已提交
2778 2779 2780
		sdata_info(sdata,
			   "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
			   mgmt->sa, tu, ms);
J
Johannes Berg 已提交
2781
		assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2782
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
2783
		if (ms > IEEE80211_ASSOC_TIMEOUT)
2784 2785
			run_again(sdata, assoc_data->timeout);
		return;
J
Johannes Berg 已提交
2786 2787
	}

2788
	bss = assoc_data->bss;
J
Johannes Berg 已提交
2789 2790

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
2791 2792
		sdata_info(sdata, "%pM denied association (code=%d)\n",
			   mgmt->sa, status_code);
J
Johannes Berg 已提交
2793 2794
		ieee80211_destroy_assoc_data(sdata, false);
	} else {
2795
		if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
J
Johannes Berg 已提交
2796
			/* oops -- internal error -- send timeout for now */
2797
			ieee80211_destroy_assoc_data(sdata, false);
2798
			cfg80211_assoc_timeout(sdata->dev, bss);
2799
			return;
J
Johannes Berg 已提交
2800
		}
2801
		sdata_info(sdata, "associated\n");
2802 2803 2804 2805 2806 2807 2808

		/*
		 * destroy assoc_data afterwards, as otherwise an idle
		 * recalc after assoc_data is NULL but before associated
		 * is set can cause the interface to go idle
		 */
		ieee80211_destroy_assoc_data(sdata, true);
J
Johannes Berg 已提交
2809 2810
	}

2811
	cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len);
J
Johannes Berg 已提交
2812
}
J
Johannes Berg 已提交
2813

2814
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
2815
				  struct ieee80211_mgmt *mgmt, size_t len,
2816
				  struct ieee80211_rx_status *rx_status,
2817
				  struct ieee802_11_elems *elems)
2818 2819 2820
{
	struct ieee80211_local *local = sdata->local;
	int freq;
2821
	struct ieee80211_bss *bss;
2822
	struct ieee80211_channel *channel;
2823

2824
	sdata_assert_lock(sdata);
2825

2826
	if (elems->ds_params)
2827 2828
		freq = ieee80211_channel_to_frequency(elems->ds_params[0],
						      rx_status->band);
2829 2830 2831 2832 2833 2834 2835 2836 2837
	else
		freq = rx_status->freq;

	channel = ieee80211_get_channel(local->hw.wiphy, freq);

	if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
		return;

	bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2838
					channel);
2839
	if (bss) {
2840
		ieee80211_rx_bss_put(local, bss);
2841 2842
		sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
	}
2843

2844 2845
	if (!sdata->u.mgd.associated ||
	    !ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid))
2846 2847
		return;

2848 2849
	ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
					 elems, true);
2850

2851 2852 2853
}


2854
static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
2855
					 struct sk_buff *skb)
2856
{
J
Johannes Berg 已提交
2857
	struct ieee80211_mgmt *mgmt = (void *)skb->data;
2858
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
2859 2860
	struct ieee80211_rx_status *rx_status = (void *) skb->cb;
	size_t baselen, len = skb->len;
2861 2862
	struct ieee802_11_elems elems;

2863 2864
	ifmgd = &sdata->u.mgd;

2865
	sdata_assert_lock(sdata);
2866

2867
	if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2868 2869
		return; /* ignore ProbeResp to foreign address */

2870 2871 2872 2873 2874
	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
	if (baselen > len)
		return;

	ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2875
			       false, &elems);
2876

2877
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2878

2879
	if (ifmgd->associated &&
2880
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2881
		ieee80211_reset_ap_probe(sdata);
J
Johannes Berg 已提交
2882 2883

	if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2884
	    ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
J
Johannes Berg 已提交
2885
		/* got probe response, continue with auth */
J
Johannes Berg 已提交
2886
		sdata_info(sdata, "direct probe responded\n");
J
Johannes Berg 已提交
2887 2888
		ifmgd->auth_data->tries = 0;
		ifmgd->auth_data->timeout = jiffies;
2889
		ifmgd->auth_data->timeout_started = true;
2890
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
2891
	}
2892 2893
}

2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907
/*
 * This is the canonical list of information elements we care about,
 * the filter code also gives us all changes to the Microsoft OUI
 * (00:50:F2) vendor IE which is used for WMM which we need to track.
 *
 * We implement beacon filtering in software since that means we can
 * avoid processing the frame here and in cfg80211, and userspace
 * will not be able to tell whether the hardware supports it or not.
 *
 * XXX: This list needs to be dynamic -- userspace needs to be able to
 *	add items it requires. It also needs to be able to tell us to
 *	look out for other vendor IEs.
 */
static const u64 care_about_ies =
2908 2909 2910 2911 2912
	(1ULL << WLAN_EID_COUNTRY) |
	(1ULL << WLAN_EID_ERP_INFO) |
	(1ULL << WLAN_EID_CHANNEL_SWITCH) |
	(1ULL << WLAN_EID_PWR_CONSTRAINT) |
	(1ULL << WLAN_EID_HT_CAPABILITY) |
2913
	(1ULL << WLAN_EID_HT_OPERATION);
2914

2915 2916 2917
static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len,
				     struct ieee80211_rx_status *rx_status)
2918
{
2919
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2920
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2921 2922
	size_t baselen;
	struct ieee802_11_elems elems;
2923
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
2924 2925
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
2926
	struct sta_info *sta;
2927
	u32 changed = 0;
2928
	bool erp_valid;
J
Johannes Berg 已提交
2929
	u8 erp_value = 0;
2930
	u32 ncrc;
2931
	u8 *bssid;
2932
	u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
2933

2934
	sdata_assert_lock(sdata);
2935

2936 2937 2938
	/* Process beacon from the current BSS */
	baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
	if (baselen > len)
2939
		return;
2940

J
Johannes Berg 已提交
2941 2942 2943 2944
	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		rcu_read_unlock();
2945
		return;
J
Johannes Berg 已提交
2946 2947
	}

2948
	if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
J
Johannes Berg 已提交
2949
		rcu_read_unlock();
2950
		return;
J
Johannes Berg 已提交
2951
	}
2952
	chan = chanctx_conf->def.chan;
J
Johannes Berg 已提交
2953
	rcu_read_unlock();
2954

2955
	if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2956
	    ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
J
Johannes Berg 已提交
2957
		ieee802_11_parse_elems(mgmt->u.beacon.variable,
2958
				       len - baselen, false, &elems);
2959

2960
		ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2961 2962 2963 2964
		if (elems.tim && !elems.parse_error) {
			const struct ieee80211_tim_ie *tim_ie = elems.tim;
			ifmgd->dtim_period = tim_ie->dtim_period;
		}
2965
		ifmgd->have_beacon = true;
2966
		ifmgd->assoc_data->need_beacon = false;
2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977
		if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
			sdata->vif.bss_conf.sync_tsf =
				le64_to_cpu(mgmt->u.beacon.timestamp);
			sdata->vif.bss_conf.sync_device_ts =
				rx_status->device_timestamp;
			if (elems.tim)
				sdata->vif.bss_conf.sync_dtim_count =
					elems.tim->dtim_count;
			else
				sdata->vif.bss_conf.sync_dtim_count = 0;
		}
J
Johannes Berg 已提交
2978 2979
		/* continue assoc process */
		ifmgd->assoc_data->timeout = jiffies;
2980
		ifmgd->assoc_data->timeout_started = true;
2981 2982
		run_again(sdata, ifmgd->assoc_data->timeout);
		return;
J
Johannes Berg 已提交
2983
	}
2984

J
Johannes Berg 已提交
2985
	if (!ifmgd->associated ||
2986
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2987
		return;
J
Johannes Berg 已提交
2988
	bssid = ifmgd->associated->bssid;
2989

2990 2991 2992 2993
	/* Track average RSSI from the Beacon frames of the current AP */
	ifmgd->last_beacon_signal = rx_status->signal;
	if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
		ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2994
		ifmgd->ave_beacon_signal = rx_status->signal * 16;
2995
		ifmgd->last_cqm_event_signal = 0;
2996
		ifmgd->count_beacon_signal = 1;
2997
		ifmgd->last_ave_beacon_signal = 0;
2998 2999 3000 3001 3002
	} else {
		ifmgd->ave_beacon_signal =
			(IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
			 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
			 ifmgd->ave_beacon_signal) / 16;
3003
		ifmgd->count_beacon_signal++;
3004
	}
3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017

	if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
		int sig = ifmgd->ave_beacon_signal;
		int last_sig = ifmgd->last_ave_beacon_signal;

		/*
		 * if signal crosses either of the boundaries, invoke callback
		 * with appropriate parameters
		 */
		if (sig > ifmgd->rssi_max_thold &&
		    (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
			ifmgd->last_ave_beacon_signal = sig;
3018
			drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
3019 3020 3021 3022
		} else if (sig < ifmgd->rssi_min_thold &&
			   (last_sig >= ifmgd->rssi_max_thold ||
			   last_sig == 0)) {
			ifmgd->last_ave_beacon_signal = sig;
3023
			drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
3024 3025 3026
		}
	}

3027
	if (bss_conf->cqm_rssi_thold &&
3028
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3029
	    !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050
		int sig = ifmgd->ave_beacon_signal / 16;
		int last_event = ifmgd->last_cqm_event_signal;
		int thold = bss_conf->cqm_rssi_thold;
		int hyst = bss_conf->cqm_rssi_hyst;
		if (sig < thold &&
		    (last_event == 0 || sig < last_event - hyst)) {
			ifmgd->last_cqm_event_signal = sig;
			ieee80211_cqm_rssi_notify(
				&sdata->vif,
				NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
				GFP_KERNEL);
		} else if (sig > thold &&
			   (last_event == 0 || sig > last_event + hyst)) {
			ifmgd->last_cqm_event_signal = sig;
			ieee80211_cqm_rssi_notify(
				&sdata->vif,
				NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
				GFP_KERNEL);
		}
	}

J
Johannes Berg 已提交
3051
	if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
J
Johannes Berg 已提交
3052
		mlme_dbg_ratelimited(sdata,
3053
				     "cancelling AP probe due to a received beacon\n");
3054
		mutex_lock(&local->mtx);
J
Johannes Berg 已提交
3055
		ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
3056 3057 3058
		ieee80211_run_deferred_scan(local);
		mutex_unlock(&local->mtx);

3059 3060 3061
		mutex_lock(&local->iflist_mtx);
		ieee80211_recalc_ps(local, -1);
		mutex_unlock(&local->iflist_mtx);
3062 3063
	}

J
Johannes Berg 已提交
3064 3065 3066 3067
	/*
	 * Push the beacon loss detection into the future since
	 * we are processing a beacon from the AP just now.
	 */
3068
	ieee80211_sta_reset_beacon_monitor(sdata);
J
Johannes Berg 已提交
3069

3070 3071
	ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
	ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3072
					  len - baselen, false, &elems,
3073 3074
					  care_about_ies, ncrc);

3075
	if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3076 3077 3078
		bool directed_tim = ieee80211_check_tim(elems.tim,
							elems.tim_len,
							ifmgd->aid);
3079
		if (directed_tim) {
3080
			if (local->hw.conf.dynamic_ps_timeout > 0) {
3081 3082 3083 3084 3085
				if (local->hw.conf.flags & IEEE80211_CONF_PS) {
					local->hw.conf.flags &= ~IEEE80211_CONF_PS;
					ieee80211_hw_config(local,
							    IEEE80211_CONF_CHANGE_PS);
				}
3086
				ieee80211_send_nullfunc(local, sdata, 0);
3087
			} else if (!local->pspolling && sdata->u.mgd.powersave) {
3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099
				local->pspolling = true;

				/*
				 * Here is assumed that the driver will be
				 * able to send ps-poll frame and receive a
				 * response even though power save mode is
				 * enabled, but some drivers might require
				 * to disable power save here. This needs
				 * to be investigated.
				 */
				ieee80211_send_pspoll(local, sdata);
			}
3100 3101
		}
	}
J
Johannes Berg 已提交
3102

3103
	if (sdata->vif.p2p) {
J
Janusz Dziedzic 已提交
3104
		struct ieee80211_p2p_noa_attr noa = {};
3105 3106 3107 3108 3109
		int ret;

		ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
					    len - baselen,
					    IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3110
					    (u8 *) &noa, sizeof(noa));
J
Janusz Dziedzic 已提交
3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126
		if (ret >= 2) {
			if (sdata->u.mgd.p2p_noa_index != noa.index) {
				/* valid noa_attr and index changed */
				sdata->u.mgd.p2p_noa_index = noa.index;
				memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
				changed |= BSS_CHANGED_P2P_PS;
				/*
				 * make sure we update all information, the CRC
				 * mechanism doesn't look at P2P attributes.
				 */
				ifmgd->beacon_crc_valid = false;
			}
		} else if (sdata->u.mgd.p2p_noa_index != -1) {
			/* noa_attr not found and we had valid noa_attr before */
			sdata->u.mgd.p2p_noa_index = -1;
			memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3127 3128 3129 3130 3131
			changed |= BSS_CHANGED_P2P_PS;
			ifmgd->beacon_crc_valid = false;
		}
	}

3132
	if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3133
		return;
3134
	ifmgd->beacon_crc = ncrc;
3135
	ifmgd->beacon_crc_valid = true;
3136

3137
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3138 3139 3140 3141 3142

	if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
				     elems.wmm_param_len))
		changed |= BSS_CHANGED_QOS;

3143 3144
	/*
	 * If we haven't had a beacon before, tell the driver about the
3145
	 * DTIM period (and beacon timing if desired) now.
3146
	 */
3147
	if (!ifmgd->have_beacon) {
3148 3149 3150 3151 3152
		/* a few bogus AP send dtim_period = 0 or no TIM IE */
		if (elems.tim)
			bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
		else
			bss_conf->dtim_period = 1;
3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165

		if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
			sdata->vif.bss_conf.sync_tsf =
				le64_to_cpu(mgmt->u.beacon.timestamp);
			sdata->vif.bss_conf.sync_device_ts =
				rx_status->device_timestamp;
			if (elems.tim)
				sdata->vif.bss_conf.sync_dtim_count =
					elems.tim->dtim_count;
			else
				sdata->vif.bss_conf.sync_dtim_count = 0;
		}

3166 3167
		changed |= BSS_CHANGED_BEACON_INFO;
		ifmgd->have_beacon = true;
3168 3169 3170 3171 3172

		mutex_lock(&local->iflist_mtx);
		ieee80211_recalc_ps(local, -1);
		mutex_unlock(&local->iflist_mtx);

3173
		ieee80211_recalc_ps_vif(sdata);
3174 3175
	}

3176
	if (elems.erp_info) {
J
Johannes Berg 已提交
3177 3178 3179 3180
		erp_valid = true;
		erp_value = elems.erp_info[0];
	} else {
		erp_valid = false;
3181
	}
J
Johannes Berg 已提交
3182 3183 3184
	changed |= ieee80211_handle_bss_capability(sdata,
			le16_to_cpu(mgmt->u.beacon.capab_info),
			erp_valid, erp_value);
3185

3186
	mutex_lock(&local->sta_mtx);
3187 3188
	sta = sta_info_get(sdata, bssid);

3189 3190 3191 3192 3193 3194
	if (ieee80211_config_bw(sdata, sta, elems.ht_operation,
				elems.vht_operation, bssid, &changed)) {
		mutex_unlock(&local->sta_mtx);
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_DEAUTH_LEAVING,
				       true, deauth_buf);
3195 3196
		cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
				      sizeof(deauth_buf));
3197
		return;
3198
	}
3199 3200 3201 3202

	if (sta && elems.opmode_notif)
		ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
					    rx_status->band, true);
3203
	mutex_unlock(&local->sta_mtx);
3204

3205 3206 3207
	if (elems.country_elem && elems.pwr_constr_elem &&
	    mgmt->u.probe_resp.capab_info &
				cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
3208 3209 3210 3211
		changed |= ieee80211_handle_pwr_constr(sdata, chan,
						       elems.country_elem,
						       elems.country_elem_len,
						       elems.pwr_constr_elem);
3212

3213
	ieee80211_bss_info_change_notify(sdata, changed);
3214 3215
}

3216 3217
void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
				  struct sk_buff *skb)
3218 3219 3220 3221
{
	struct ieee80211_rx_status *rx_status;
	struct ieee80211_mgmt *mgmt;
	u16 fc;
3222 3223
	struct ieee802_11_elems elems;
	int ies_len;
3224 3225 3226 3227 3228

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

3229
	sdata_lock(sdata);
3230

J
Johannes Berg 已提交
3231 3232
	switch (fc & IEEE80211_FCTL_STYPE) {
	case IEEE80211_STYPE_BEACON:
3233
		ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
J
Johannes Berg 已提交
3234 3235 3236 3237 3238
		break;
	case IEEE80211_STYPE_PROBE_RESP:
		ieee80211_rx_mgmt_probe_resp(sdata, skb);
		break;
	case IEEE80211_STYPE_AUTH:
3239
		ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3240 3241
		break;
	case IEEE80211_STYPE_DEAUTH:
3242
		ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3243 3244
		break;
	case IEEE80211_STYPE_DISASSOC:
3245
		ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3246 3247 3248
		break;
	case IEEE80211_STYPE_ASSOC_RESP:
	case IEEE80211_STYPE_REASSOC_RESP:
3249
		ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3250 3251
		break;
	case IEEE80211_STYPE_ACTION:
3252
		if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3253 3254 3255
			ies_len = skb->len -
				  offsetof(struct ieee80211_mgmt,
					   u.action.u.chan_switch.variable);
3256 3257 3258 3259 3260 3261

			if (ies_len < 0)
				break;

			ieee802_11_parse_elems(
				mgmt->u.action.u.chan_switch.variable,
3262
				ies_len, true, &elems);
3263 3264 3265 3266

			if (elems.parse_error)
				break;

3267 3268
			ieee80211_sta_process_chanswitch(sdata,
							 rx_status->mactime,
3269
							 &elems, false);
3270 3271 3272 3273 3274 3275 3276 3277 3278 3279
		} else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
			ies_len = skb->len -
				  offsetof(struct ieee80211_mgmt,
					   u.action.u.ext_chan_switch.variable);

			if (ies_len < 0)
				break;

			ieee802_11_parse_elems(
				mgmt->u.action.u.ext_chan_switch.variable,
3280
				ies_len, true, &elems);
3281 3282 3283 3284 3285 3286 3287 3288

			if (elems.parse_error)
				break;

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

J
Johannes Berg 已提交
3289
			ieee80211_sta_process_chanswitch(sdata,
3290
							 rx_status->mactime,
3291
							 &elems, false);
3292
		}
3293
		break;
3294
	}
3295
	sdata_unlock(sdata);
3296 3297
}

J
Johannes Berg 已提交
3298
static void ieee80211_sta_timer(unsigned long data)
3299
{
J
Johannes Berg 已提交
3300 3301
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
3302

3303
	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3304 3305
}

3306
static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3307
					  u8 *bssid, u8 reason, bool tx)
3308
{
3309
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3310

3311
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3312
			       tx, frame_buf);
3313

3314 3315
	cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
			      IEEE80211_DEAUTH_FRAME_LEN);
3316 3317
}

J
Johannes Berg 已提交
3318 3319 3320 3321 3322
static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3323
	u32 tx_flags = 0;
J
Johannes Berg 已提交
3324

3325
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3326 3327 3328 3329 3330 3331 3332

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

	auth_data->tries++;

	if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
J
Johannes Berg 已提交
3333 3334
		sdata_info(sdata, "authentication with %pM timed out\n",
			   auth_data->bss->bssid);
J
Johannes Berg 已提交
3335 3336 3337 3338 3339 3340 3341 3342 3343 3344

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

		return -ETIMEDOUT;
	}

J
Johannes Berg 已提交
3345 3346
	drv_mgd_prepare_tx(local, sdata);

J
Johannes Berg 已提交
3347
	if (auth_data->bss->proberesp_ies) {
3348 3349 3350
		u16 trans = 1;
		u16 status = 0;

J
Johannes Berg 已提交
3351 3352 3353
		sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
			   auth_data->bss->bssid, auth_data->tries,
			   IEEE80211_AUTH_MAX_TRIES);
J
Johannes Berg 已提交
3354 3355

		auth_data->expected_transaction = 2;
3356 3357 3358 3359 3360 3361 3362

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

3363 3364 3365 3366
		if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
			tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
				   IEEE80211_TX_INTFL_MLME_CONN_TX;

3367 3368
		ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
				    auth_data->data, auth_data->data_len,
J
Johannes Berg 已提交
3369
				    auth_data->bss->bssid,
3370 3371
				    auth_data->bss->bssid, NULL, 0, 0,
				    tx_flags);
J
Johannes Berg 已提交
3372 3373 3374
	} else {
		const u8 *ssidie;

J
Johannes Berg 已提交
3375 3376 3377
		sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
			   auth_data->bss->bssid, auth_data->tries,
			   IEEE80211_AUTH_MAX_TRIES);
J
Johannes Berg 已提交
3378

3379
		rcu_read_lock();
J
Johannes Berg 已提交
3380
		ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3381 3382
		if (!ssidie) {
			rcu_read_unlock();
J
Johannes Berg 已提交
3383
			return -EINVAL;
3384
		}
J
Johannes Berg 已提交
3385 3386 3387 3388 3389
		/*
		 * Direct probe is sent to broadcast address as some APs
		 * will not answer to direct packet in unassociated state.
		 */
		ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3390
					 NULL, 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
3391
					 auth_data->bss->channel, false);
3392
		rcu_read_unlock();
J
Johannes Berg 已提交
3393 3394
	}

3395
	if (tx_flags == 0) {
3396
		auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3397
		ifmgd->auth_data->timeout_started = true;
3398
		run_again(sdata, auth_data->timeout);
3399 3400
	} else {
		auth_data->timeout_started = false;
3401
	}
J
Johannes Berg 已提交
3402 3403 3404 3405 3406 3407 3408 3409 3410

	return 0;
}

static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
	struct ieee80211_local *local = sdata->local;

3411
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3412 3413 3414

	assoc_data->tries++;
	if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
J
Johannes Berg 已提交
3415 3416
		sdata_info(sdata, "association with %pM timed out\n",
			   assoc_data->bss->bssid);
J
Johannes Berg 已提交
3417 3418 3419 3420 3421 3422 3423 3424 3425 3426

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

		return -ETIMEDOUT;
	}

J
Johannes Berg 已提交
3427 3428 3429
	sdata_info(sdata, "associate with %pM (try %d/%d)\n",
		   assoc_data->bss->bssid, assoc_data->tries,
		   IEEE80211_ASSOC_MAX_TRIES);
J
Johannes Berg 已提交
3430 3431
	ieee80211_send_assoc(sdata);

3432 3433
	if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
		assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3434
		assoc_data->timeout_started = true;
3435
		run_again(sdata, assoc_data->timeout);
3436 3437
	} else {
		assoc_data->timeout_started = false;
3438
	}
J
Johannes Berg 已提交
3439 3440 3441 3442

	return 0;
}

3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454
void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
				  __le16 fc, bool acked)
{
	struct ieee80211_local *local = sdata->local;

	sdata->u.mgd.status_fc = fc;
	sdata->u.mgd.status_acked = acked;
	sdata->u.mgd.status_received = true;

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

3455
void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
3456 3457
{
	struct ieee80211_local *local = sdata->local;
3458
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3459

3460
	sdata_lock(sdata);
3461

3462 3463 3464 3465 3466 3467 3468 3469 3470 3471
	if (ifmgd->status_received) {
		__le16 fc = ifmgd->status_fc;
		bool status_acked = ifmgd->status_acked;

		ifmgd->status_received = false;
		if (ifmgd->auth_data &&
		    (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
			if (status_acked) {
				ifmgd->auth_data->timeout =
					jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3472
				run_again(sdata, ifmgd->auth_data->timeout);
3473 3474 3475
			} else {
				ifmgd->auth_data->timeout = jiffies - 1;
			}
3476
			ifmgd->auth_data->timeout_started = true;
3477 3478 3479 3480 3481 3482
		} else if (ifmgd->assoc_data &&
			   (ieee80211_is_assoc_req(fc) ||
			    ieee80211_is_reassoc_req(fc))) {
			if (status_acked) {
				ifmgd->assoc_data->timeout =
					jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3483
				run_again(sdata, ifmgd->assoc_data->timeout);
3484 3485 3486
			} else {
				ifmgd->assoc_data->timeout = jiffies - 1;
			}
3487
			ifmgd->assoc_data->timeout_started = true;
3488 3489 3490
		}
	}

3491
	if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
J
Johannes Berg 已提交
3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505
	    time_after(jiffies, ifmgd->auth_data->timeout)) {
		if (ifmgd->auth_data->done) {
			/*
			 * ok ... we waited for assoc but userspace didn't,
			 * so let's just kill the auth data
			 */
			ieee80211_destroy_auth_data(sdata, false);
		} else if (ieee80211_probe_auth(sdata)) {
			u8 bssid[ETH_ALEN];

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

			ieee80211_destroy_auth_data(sdata, false);

3506
			cfg80211_auth_timeout(sdata->dev, bssid);
J
Johannes Berg 已提交
3507
		}
3508
	} else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3509
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
3510

3511
	if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
J
Johannes Berg 已提交
3512
	    time_after(jiffies, ifmgd->assoc_data->timeout)) {
3513
		if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
J
Johannes Berg 已提交
3514
		    ieee80211_do_assoc(sdata)) {
3515
			struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
J
Johannes Berg 已提交
3516 3517

			ieee80211_destroy_assoc_data(sdata, false);
3518
			cfg80211_assoc_timeout(sdata->dev, bss);
J
Johannes Berg 已提交
3519
		}
3520
	} else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3521
		run_again(sdata, ifmgd->assoc_data->timeout);
J
Johannes Berg 已提交
3522

J
Johannes Berg 已提交
3523 3524 3525
	if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
			    IEEE80211_STA_CONNECTION_POLL) &&
	    ifmgd->associated) {
3526
		u8 bssid[ETH_ALEN];
3527
		int max_tries;
3528

3529
		memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3530

3531
		if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3532
			max_tries = max_nullfunc_tries;
3533
		else
3534
			max_tries = max_probe_tries;
3535

3536 3537 3538
		/* ACK received for nullfunc probing frame */
		if (!ifmgd->probe_send_count)
			ieee80211_reset_ap_probe(sdata);
3539 3540
		else if (ifmgd->nullfunc_failed) {
			if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3541 3542 3543 3544
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
					 bssid, ifmgd->probe_send_count,
					 max_tries);
3545 3546
				ieee80211_mgd_probe_ap_send(sdata);
			} else {
J
Johannes Berg 已提交
3547 3548 3549
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
					 bssid);
3550
				ieee80211_sta_connection_lost(sdata, bssid,
3551 3552
					WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
					false);
3553 3554
			}
		} else if (time_is_after_jiffies(ifmgd->probe_timeout))
3555
			run_again(sdata, ifmgd->probe_timeout);
3556
		else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
J
Johannes Berg 已提交
3557 3558 3559
			mlme_dbg(sdata,
				 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
				 bssid, probe_wait_ms);
3560
			ieee80211_sta_connection_lost(sdata, bssid,
3561
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3562
		} else if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3563 3564 3565 3566
			mlme_dbg(sdata,
				 "No probe response from AP %pM after %dms, try %d/%i\n",
				 bssid, probe_wait_ms,
				 ifmgd->probe_send_count, max_tries);
3567 3568
			ieee80211_mgd_probe_ap_send(sdata);
		} else {
J
Johannes Berg 已提交
3569 3570 3571 3572
			/*
			 * We actually lost the connection ... or did we?
			 * Let's make sure!
			 */
3573 3574 3575 3576
			wiphy_debug(local->hw.wiphy,
				    "%s: No probe response from AP %pM"
				    " after %dms, disconnecting.\n",
				    sdata->name,
3577
				    bssid, probe_wait_ms);
3578

3579
			ieee80211_sta_connection_lost(sdata, bssid,
3580
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
J
Johannes Berg 已提交
3581 3582 3583
		}
	}

3584
	sdata_unlock(sdata);
3585 3586
}

J
Johannes Berg 已提交
3587 3588 3589 3590 3591 3592 3593 3594 3595
static void ieee80211_sta_bcn_mon_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
	struct ieee80211_local *local = sdata->local;

	if (local->quiescing)
		return;

3596
	sdata->u.mgd.connection_loss = false;
3597 3598
	ieee80211_queue_work(&sdata->local->hw,
			     &sdata->u.mgd.beacon_connection_loss_work);
J
Johannes Berg 已提交
3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610
}

static void ieee80211_sta_conn_mon_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_local *local = sdata->local;

	if (local->quiescing)
		return;

3611
	ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
J
Johannes Berg 已提交
3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622
}

static void ieee80211_sta_monitor_work(struct work_struct *work)
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
			     u.mgd.monitor_work);

	ieee80211_mgd_probe_ap(sdata, false);
}

J
Johannes Berg 已提交
3623 3624
static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
3625 3626
	u32 flags;

3627
	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3628
		__ieee80211_stop_poll(sdata);
3629

J
Johannes Berg 已提交
3630
		/* let's probe the connection once */
3631 3632 3633 3634
		flags = sdata->local->hw.flags;
		if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
			ieee80211_queue_work(&sdata->local->hw,
					     &sdata->u.mgd.monitor_work);
J
Johannes Berg 已提交
3635
		/* and do all the other regular work too */
J
Johannes Berg 已提交
3636
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3637
	}
J
Johannes Berg 已提交
3638
}
3639

3640 3641 3642 3643 3644
#ifdef CONFIG_PM
void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

3645
	sdata_lock(sdata);
3646
	if (!ifmgd->associated) {
3647
		sdata_unlock(sdata);
3648 3649 3650 3651 3652 3653 3654 3655 3656 3657
		return;
	}

	if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
		sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
		mlme_dbg(sdata, "driver requested disconnect after resume\n");
		ieee80211_sta_connection_lost(sdata,
					      ifmgd->associated->bssid,
					      WLAN_REASON_UNSPECIFIED,
					      true);
3658
		sdata_unlock(sdata);
3659 3660
		return;
	}
3661
	sdata_unlock(sdata);
3662 3663 3664
}
#endif

J
Johannes Berg 已提交
3665 3666
/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3667
{
3668
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
3669

3670
	ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3671
	INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3672
	INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3673 3674
	INIT_WORK(&ifmgd->beacon_connection_loss_work,
		  ieee80211_beacon_connection_loss_work);
3675 3676
	INIT_WORK(&ifmgd->csa_connection_drop_work,
		  ieee80211_csa_connection_drop_work);
3677
	INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3678
	setup_timer(&ifmgd->timer, ieee80211_sta_timer,
S
Sujith 已提交
3679
		    (unsigned long) sdata);
J
Johannes Berg 已提交
3680 3681 3682 3683
	setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
		    (unsigned long) sdata);
	setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
		    (unsigned long) sdata);
3684
	setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
J
Johannes Berg 已提交
3685 3686
		    (unsigned long) sdata);

3687
	ifmgd->flags = 0;
3688
	ifmgd->powersave = sdata->wdev.ps;
3689 3690
	ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
	ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
J
Janusz Dziedzic 已提交
3691
	ifmgd->p2p_noa_index = -1;
J
Johannes Berg 已提交
3692

3693 3694 3695 3696
	if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
		ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
	else
		ifmgd->req_smps = IEEE80211_SMPS_OFF;
3697 3698
}

3699 3700
/* scan finished notification */
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
J
Johannes Berg 已提交
3701
{
3702
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
3703

3704 3705
	/* Restart STA timers */
	rcu_read_lock();
3706 3707 3708 3709
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (ieee80211_sdata_running(sdata))
			ieee80211_restart_sta_timer(sdata);
	}
3710 3711
	rcu_read_unlock();
}
J
Johannes Berg 已提交
3712

3713 3714 3715 3716 3717 3718 3719
int ieee80211_max_network_latency(struct notifier_block *nb,
				  unsigned long data, void *dummy)
{
	s32 latency_usec = (s32) data;
	struct ieee80211_local *local =
		container_of(nb, struct ieee80211_local,
			     network_latency_notifier);
3720

3721 3722 3723
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, latency_usec);
	mutex_unlock(&local->iflist_mtx);
3724

3725
	return 0;
J
Johannes Berg 已提交
3726 3727
}

J
Johannes Berg 已提交
3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739
static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
				     struct cfg80211_bss *cbss)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ht_cap_ie, *vht_cap_ie;
	const struct ieee80211_ht_cap *ht_cap;
	const struct ieee80211_vht_cap *vht_cap;
	u8 chains = 1;

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

3740
	ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
J
Johannes Berg 已提交
3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752
	if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
		ht_cap = (void *)(ht_cap_ie + 2);
		chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
		/*
		 * TODO: use "Tx Maximum Number Spatial Streams Supported" and
		 *	 "Tx Unequal Modulation Supported" fields.
		 */
	}

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

3753
	vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
J
Johannes Berg 已提交
3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771
	if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
		u8 nss;
		u16 tx_mcs_map;

		vht_cap = (void *)(vht_cap_ie + 2);
		tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
		for (nss = 8; nss > 0; nss--) {
			if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
					IEEE80211_VHT_MCS_NOT_SUPPORTED)
				break;
		}
		/* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
		chains = max(chains, nss);
	}

	return chains;
}

3772 3773
static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
				  struct cfg80211_bss *cbss)
3774 3775 3776
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3777
	const struct ieee80211_ht_operation *ht_oper = NULL;
J
Johannes Berg 已提交
3778
	const struct ieee80211_vht_operation *vht_oper = NULL;
3779
	struct ieee80211_supported_band *sband;
3780
	struct cfg80211_chan_def chandef;
J
Johannes Berg 已提交
3781
	int ret;
3782

3783 3784
	sband = local->hw.wiphy->bands[cbss->channel->band];

J
Johannes Berg 已提交
3785 3786 3787 3788
	ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
			  IEEE80211_STA_DISABLE_80P80MHZ |
			  IEEE80211_STA_DISABLE_160MHZ);

3789 3790
	rcu_read_lock();

J
Johannes Berg 已提交
3791 3792
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	    sband->ht_cap.ht_supported) {
3793
		const u8 *ht_oper_ie, *ht_cap;
3794

3795
		ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3796 3797
		if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
			ht_oper = (void *)(ht_oper_ie + 2);
3798 3799 3800 3801 3802 3803

		ht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
		if (!ht_cap || ht_cap[1] < sizeof(struct ieee80211_ht_cap)) {
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ht_oper = NULL;
		}
3804 3805
	}

J
Johannes Berg 已提交
3806 3807
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    sband->vht_cap.vht_supported) {
3808
		const u8 *vht_oper_ie, *vht_cap;
J
Johannes Berg 已提交
3809

3810 3811
		vht_oper_ie = ieee80211_bss_get_ie(cbss,
						   WLAN_EID_VHT_OPERATION);
J
Johannes Berg 已提交
3812 3813 3814 3815
		if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
			vht_oper = (void *)(vht_oper_ie + 2);
		if (vht_oper && !ht_oper) {
			vht_oper = NULL;
J
Johannes Berg 已提交
3816
			sdata_info(sdata,
J
Johannes Berg 已提交
3817
				   "AP advertised VHT without HT, disabling both\n");
3818 3819
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3820
		}
3821 3822 3823 3824 3825 3826

		vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
		if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
			vht_oper = NULL;
		}
3827 3828
	}

J
Johannes Berg 已提交
3829 3830 3831
	ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
						     cbss->channel,
						     ht_oper, vht_oper,
3832
						     &chandef, true);
3833

J
Johannes Berg 已提交
3834 3835
	sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
				      local->rx_chains);
3836

3837 3838
	rcu_read_unlock();

3839 3840 3841
	/* will change later if needed */
	sdata->smps_mode = IEEE80211_SMPS_OFF;

J
Johannes Berg 已提交
3842 3843 3844 3845 3846 3847 3848
	/*
	 * If this fails (possibly due to channel context sharing
	 * on incompatible channels, e.g. 80+80 and 160 sharing the
	 * same control channel) try to use a smaller bandwidth.
	 */
	ret = ieee80211_vif_use_channel(sdata, &chandef,
					IEEE80211_CHANCTX_SHARED);
3849 3850 3851 3852 3853 3854

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

3855
	while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
J
Johannes Berg 已提交
3856
		ifmgd->flags |= chandef_downgrade(&chandef);
3857 3858 3859
		ret = ieee80211_vif_use_channel(sdata, &chandef,
						IEEE80211_CHANCTX_SHARED);
	}
J
Johannes Berg 已提交
3860
	return ret;
3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887
}

static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
				     struct cfg80211_bss *cbss, bool assoc)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_bss *bss = (void *)cbss->priv;
	struct sta_info *new_sta = NULL;
	bool have_sta = false;
	int err;

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

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

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

J
Johannes Berg 已提交
3888
	if (new_sta) {
3889 3890 3891
		u32 rates = 0, basic_rates = 0;
		bool have_higher_than_11mbit;
		int min_rate = INT_MAX, min_rate_index = -1;
3892
		struct ieee80211_supported_band *sband;
J
Johannes Berg 已提交
3893
		const struct cfg80211_bss_ies *ies;
3894 3895 3896 3897 3898 3899 3900 3901

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

		err = ieee80211_prep_channel(sdata, cbss);
		if (err) {
			sta_info_free(local, new_sta);
			return err;
		}
3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917

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

		/*
		 * This used to be a workaround for basic rates missing
		 * in the association response frame. Now that we no
		 * longer use the basic rates from there, it probably
		 * doesn't happen any more, but keep the workaround so
		 * in case some *other* APs are buggy in different ways
		 * we can connect -- with a warning.
		 */
		if (!basic_rates && min_rate_index >= 0) {
J
Johannes Berg 已提交
3918 3919
			sdata_info(sdata,
				   "No basic rates, using min rate instead\n");
3920 3921 3922
			basic_rates = BIT(min_rate_index);
		}

J
Johannes Berg 已提交
3923
		new_sta->sta.supp_rates[cbss->channel->band] = rates;
3924 3925 3926
		sdata->vif.bss_conf.basic_rates = basic_rates;

		/* cf. IEEE 802.11 9.2.12 */
J
Johannes Berg 已提交
3927
		if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3928 3929 3930 3931 3932 3933 3934
		    have_higher_than_11mbit)
			sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
		else
			sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

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

3935 3936
		/* set timing information */
		sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
J
Johannes Berg 已提交
3937
		rcu_read_lock();
3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963
		ies = rcu_dereference(cbss->beacon_ies);
		if (ies) {
			const u8 *tim_ie;

			sdata->vif.bss_conf.sync_tsf = ies->tsf;
			sdata->vif.bss_conf.sync_device_ts =
				bss->device_ts_beacon;
			tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
						  ies->data, ies->len);
			if (tim_ie && tim_ie[1] >= 2)
				sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
			else
				sdata->vif.bss_conf.sync_dtim_count = 0;
		} else if (!(local->hw.flags &
					IEEE80211_HW_TIMING_BEACON_ONLY)) {
			ies = rcu_dereference(cbss->proberesp_ies);
			/* must be non-NULL since beacon IEs were NULL */
			sdata->vif.bss_conf.sync_tsf = ies->tsf;
			sdata->vif.bss_conf.sync_device_ts =
				bss->device_ts_presp;
			sdata->vif.bss_conf.sync_dtim_count = 0;
		} else {
			sdata->vif.bss_conf.sync_tsf = 0;
			sdata->vif.bss_conf.sync_device_ts = 0;
			sdata->vif.bss_conf.sync_dtim_count = 0;
		}
J
Johannes Berg 已提交
3964
		rcu_read_unlock();
3965 3966

		/* tell driver about BSSID, basic rates and timing */
3967
		ieee80211_bss_info_change_notify(sdata,
3968 3969
			BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
			BSS_CHANGED_BEACON_INT);
3970 3971

		if (assoc)
J
Johannes Berg 已提交
3972
			sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3973

J
Johannes Berg 已提交
3974 3975
		err = sta_info_insert(new_sta);
		new_sta = NULL;
3976
		if (err) {
J
Johannes Berg 已提交
3977 3978 3979
			sdata_info(sdata,
				   "failed to insert STA entry for the AP (error %d)\n",
				   err);
3980 3981 3982
			return err;
		}
	} else
3983
		WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3984 3985 3986 3987

	return 0;
}

3988 3989 3990
/* config hooks */
int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
		       struct cfg80211_auth_request *req)
J
Johannes Berg 已提交
3991
{
J
Johannes Berg 已提交
3992 3993 3994
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data;
3995
	u16 auth_alg;
J
Johannes Berg 已提交
3996 3997 3998
	int err;

	/* prepare auth data structure */
J
Johannes Berg 已提交
3999

4000 4001 4002 4003 4004
	switch (req->auth_type) {
	case NL80211_AUTHTYPE_OPEN_SYSTEM:
		auth_alg = WLAN_AUTH_OPEN;
		break;
	case NL80211_AUTHTYPE_SHARED_KEY:
J
Johannes Berg 已提交
4005
		if (IS_ERR(local->wep_tx_tfm))
4006
			return -EOPNOTSUPP;
4007 4008 4009 4010 4011 4012 4013 4014
		auth_alg = WLAN_AUTH_SHARED_KEY;
		break;
	case NL80211_AUTHTYPE_FT:
		auth_alg = WLAN_AUTH_FT;
		break;
	case NL80211_AUTHTYPE_NETWORK_EAP:
		auth_alg = WLAN_AUTH_LEAP;
		break;
4015 4016 4017
	case NL80211_AUTHTYPE_SAE:
		auth_alg = WLAN_AUTH_SAE;
		break;
4018 4019
	default:
		return -EOPNOTSUPP;
J
Johannes Berg 已提交
4020
	}
4021

4022 4023
	auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
			    req->ie_len, GFP_KERNEL);
J
Johannes Berg 已提交
4024
	if (!auth_data)
J
Johannes Berg 已提交
4025
		return -ENOMEM;
4026

J
Johannes Berg 已提交
4027
	auth_data->bss = req->bss;
4028

4029 4030 4031 4032 4033 4034 4035 4036 4037
	if (req->sae_data_len >= 4) {
		__le16 *pos = (__le16 *) req->sae_data;
		auth_data->sae_trans = le16_to_cpu(pos[0]);
		auth_data->sae_status = le16_to_cpu(pos[1]);
		memcpy(auth_data->data, req->sae_data + 4,
		       req->sae_data_len - 4);
		auth_data->data_len += req->sae_data_len - 4;
	}

4038
	if (req->ie && req->ie_len) {
4039 4040 4041
		memcpy(&auth_data->data[auth_data->data_len],
		       req->ie, req->ie_len);
		auth_data->data_len += req->ie_len;
J
Johannes Berg 已提交
4042
	}
4043

J
Johannes Berg 已提交
4044
	if (req->key && req->key_len) {
J
Johannes Berg 已提交
4045 4046 4047
		auth_data->key_len = req->key_len;
		auth_data->key_idx = req->key_idx;
		memcpy(auth_data->key, req->key, req->key_len);
J
Johannes Berg 已提交
4048 4049
	}

J
Johannes Berg 已提交
4050
	auth_data->algorithm = auth_alg;
J
Johannes Berg 已提交
4051

J
Johannes Berg 已提交
4052
	/* try to authenticate/probe */
4053

J
Johannes Berg 已提交
4054 4055 4056 4057
	if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
	    ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
4058 4059
	}

J
Johannes Berg 已提交
4060 4061
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
4062

J
Johannes Berg 已提交
4063 4064
	/* prep auth_data so we don't go into idle on disassoc */
	ifmgd->auth_data = auth_data;
J
Johannes Berg 已提交
4065

4066 4067 4068 4069 4070 4071 4072
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_UNSPECIFIED,
				       false, frame_buf);

4073 4074
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      sizeof(frame_buf));
4075
	}
J
Johannes Berg 已提交
4076

J
Johannes Berg 已提交
4077
	sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4078

4079 4080
	err = ieee80211_prep_connection(sdata, req->bss, false);
	if (err)
J
Johannes Berg 已提交
4081
		goto err_clear;
J
Johannes Berg 已提交
4082

J
Johannes Berg 已提交
4083 4084 4085 4086 4087 4088 4089
	err = ieee80211_probe_auth(sdata);
	if (err) {
		sta_info_destroy_addr(sdata, req->bss->bssid);
		goto err_clear;
	}

	/* hold our own reference */
4090
	cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4091
	return 0;
J
Johannes Berg 已提交
4092 4093

 err_clear:
4094 4095
	memset(ifmgd->bssid, 0, ETH_ALEN);
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4096 4097 4098 4099
	ifmgd->auth_data = NULL;
 err_free:
	kfree(auth_data);
	return err;
J
Johannes Berg 已提交
4100 4101
}

4102 4103
int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
			struct cfg80211_assoc_request *req)
4104
{
J
Johannes Berg 已提交
4105
	struct ieee80211_local *local = sdata->local;
4106
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4107
	struct ieee80211_bss *bss = (void *)req->bss->priv;
J
Johannes Berg 已提交
4108
	struct ieee80211_mgd_assoc_data *assoc_data;
4109
	const struct cfg80211_bss_ies *beacon_ies;
J
Johannes Berg 已提交
4110
	struct ieee80211_supported_band *sband;
4111
	const u8 *ssidie, *ht_ie, *vht_ie;
4112
	int i, err;
4113

J
Johannes Berg 已提交
4114 4115 4116 4117
	assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
	if (!assoc_data)
		return -ENOMEM;

4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128
	rcu_read_lock();
	ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
	if (!ssidie) {
		rcu_read_unlock();
		kfree(assoc_data);
		return -EINVAL;
	}
	memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
	assoc_data->ssid_len = ssidie[1];
	rcu_read_unlock();

4129 4130 4131 4132 4133 4134 4135
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_UNSPECIFIED,
				       false, frame_buf);

4136 4137
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      sizeof(frame_buf));
4138
	}
J
Johannes Berg 已提交
4139 4140 4141 4142

	if (ifmgd->auth_data && !ifmgd->auth_data->done) {
		err = -EBUSY;
		goto err_free;
J
Johannes Berg 已提交
4143
	}
4144

J
Johannes Berg 已提交
4145 4146 4147 4148
	if (ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
	}
4149

J
Johannes Berg 已提交
4150 4151 4152 4153
	if (ifmgd->auth_data) {
		bool match;

		/* keep sta info, bssid if matching */
4154
		match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
J
Johannes Berg 已提交
4155
		ieee80211_destroy_auth_data(sdata, match);
4156 4157
	}

J
Johannes Berg 已提交
4158
	/* prepare assoc data */
4159
	
4160 4161
	ifmgd->beacon_crc_valid = false;

J
Johannes Berg 已提交
4162 4163 4164 4165 4166 4167 4168
	/*
	 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
	 * We still associate in non-HT mode (11a/b/g) if any one of these
	 * ciphers is configured as pairwise.
	 * We can set this to true for non-11n hardware, that'll be checked
	 * separately along with the peer capabilities.
	 */
4169
	for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4170 4171
		if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4172
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4173
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4174
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4175
			netdev_info(sdata->dev,
4176
				    "disabling HT/VHT due to WEP/TKIP use\n");
4177 4178
		}
	}
4179

4180
	if (req->flags & ASSOC_REQ_DISABLE_HT) {
4181
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4182 4183
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
	}
B
Ben Greear 已提交
4184

4185 4186 4187
	if (req->flags & ASSOC_REQ_DISABLE_VHT)
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;

J
Johannes Berg 已提交
4188 4189 4190
	/* Also disable HT if we don't support it or the AP doesn't use WMM */
	sband = local->hw.wiphy->bands[req->bss->channel->band];
	if (!sband->ht_cap.ht_supported ||
4191
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
4192
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4193 4194 4195
		if (!bss->wmm_used)
			netdev_info(sdata->dev,
				    "disabling HT as WMM/QoS is not supported by the AP\n");
4196
	}
J
Johannes Berg 已提交
4197

4198 4199 4200 4201
	/* disable VHT if we don't support it or the AP doesn't use WMM */
	if (!sband->vht_cap.vht_supported ||
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4202 4203 4204
		if (!bss->wmm_used)
			netdev_info(sdata->dev,
				    "disabling VHT as WMM/QoS is not supported by the AP\n");
4205 4206
	}

B
Ben Greear 已提交
4207 4208 4209 4210
	memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
	memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
	       sizeof(ifmgd->ht_capa_mask));

4211 4212 4213 4214
	memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
	memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
	       sizeof(ifmgd->vht_capa_mask));

4215
	if (req->ie && req->ie_len) {
J
Johannes Berg 已提交
4216 4217 4218
		memcpy(assoc_data->ie, req->ie, req->ie_len);
		assoc_data->ie_len = req->ie_len;
	}
4219

J
Johannes Berg 已提交
4220
	assoc_data->bss = req->bss;
4221

J
Johannes Berg 已提交
4222 4223
	if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
		if (ifmgd->powersave)
4224
			sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
J
Johannes Berg 已提交
4225
		else
4226
			sdata->smps_mode = IEEE80211_SMPS_OFF;
J
Johannes Berg 已提交
4227
	} else
4228
		sdata->smps_mode = ifmgd->req_smps;
J
Johannes Berg 已提交
4229

J
Johannes Berg 已提交
4230
	assoc_data->capability = req->bss->capability;
J
Johannes Berg 已提交
4231 4232
	assoc_data->wmm = bss->wmm_used &&
			  (local->hw.queues >= IEEE80211_NUM_ACS);
J
Johannes Berg 已提交
4233 4234
	assoc_data->supp_rates = bss->supp_rates;
	assoc_data->supp_rates_len = bss->supp_rates_len;
4235

4236
	rcu_read_lock();
4237 4238 4239 4240 4241
	ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
	if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
		assoc_data->ap_ht_param =
			((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
	else
4242
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4243 4244 4245 4246 4247 4248
	vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
	if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
		memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
		       sizeof(struct ieee80211_vht_cap));
	else
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4249
	rcu_read_unlock();
4250

K
Kalle Valo 已提交
4251
	if (bss->wmm_used && bss->uapsd_supported &&
4252 4253
	    (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) &&
	    sdata->wmm_acm != 0xff) {
4254
		assoc_data->uapsd = true;
K
Kalle Valo 已提交
4255 4256
		ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
	} else {
4257
		assoc_data->uapsd = false;
K
Kalle Valo 已提交
4258 4259 4260
		ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
	}

4261
	if (req->prev_bssid)
J
Johannes Berg 已提交
4262
		memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276

	if (req->use_mfp) {
		ifmgd->mfp = IEEE80211_MFP_REQUIRED;
		ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
	} else {
		ifmgd->mfp = IEEE80211_MFP_DISABLED;
		ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
	}

	if (req->crypto.control_port)
		ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
	else
		ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;

4277 4278 4279
	sdata->control_port_protocol = req->crypto.control_port_ethertype;
	sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;

J
Johannes Berg 已提交
4280 4281 4282
	/* kick off associate process */

	ifmgd->assoc_data = assoc_data;
4283
	ifmgd->dtim_period = 0;
4284
	ifmgd->have_beacon = false;
J
Johannes Berg 已提交
4285

4286 4287 4288
	err = ieee80211_prep_connection(sdata, req->bss, true);
	if (err)
		goto err_clear;
J
Johannes Berg 已提交
4289

4290 4291
	rcu_read_lock();
	beacon_ies = rcu_dereference(req->bss->beacon_ies);
4292

4293 4294 4295 4296 4297 4298 4299 4300 4301
	if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
	    !beacon_ies) {
		/*
		 * Wait up to one beacon interval ...
		 * should this be more if we miss one?
		 */
		sdata_info(sdata, "waiting for beacon from %pM\n",
			   ifmgd->bssid);
		assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4302
		assoc_data->timeout_started = true;
4303 4304 4305 4306 4307
		assoc_data->need_beacon = true;
	} else if (beacon_ies) {
		const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
						    beacon_ies->data,
						    beacon_ies->len);
4308 4309
		u8 dtim_count = 0;

4310 4311 4312 4313
		if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
			const struct ieee80211_tim_ie *tim;
			tim = (void *)(tim_ie + 2);
			ifmgd->dtim_period = tim->dtim_period;
4314
			dtim_count = tim->dtim_count;
4315
		}
4316
		ifmgd->have_beacon = true;
J
Johannes Berg 已提交
4317
		assoc_data->timeout = jiffies;
4318
		assoc_data->timeout_started = true;
4319 4320 4321 4322 4323 4324 4325

		if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
			sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
			sdata->vif.bss_conf.sync_device_ts =
				bss->device_ts_beacon;
			sdata->vif.bss_conf.sync_dtim_count = dtim_count;
		}
4326 4327
	} else {
		assoc_data->timeout = jiffies;
4328
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
4329
	}
4330 4331
	rcu_read_unlock();

4332
	run_again(sdata, assoc_data->timeout);
J
Johannes Berg 已提交
4333

P
Paul Stewart 已提交
4334 4335 4336 4337 4338 4339 4340 4341 4342 4343
	if (bss->corrupt_data) {
		char *corrupt_type = "data";
		if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
			if (bss->corrupt_data &
					IEEE80211_BSS_CORRUPT_PROBE_RESP)
				corrupt_type = "beacon and probe response";
			else
				corrupt_type = "beacon";
		} else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
			corrupt_type = "probe response";
J
Johannes Berg 已提交
4344 4345
		sdata_info(sdata, "associating with AP with corrupt %s\n",
			   corrupt_type);
P
Paul Stewart 已提交
4346 4347
	}

4348
	return 0;
J
Johannes Berg 已提交
4349
 err_clear:
4350 4351
	memset(ifmgd->bssid, 0, ETH_ALEN);
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4352 4353 4354 4355
	ifmgd->assoc_data = NULL;
 err_free:
	kfree(assoc_data);
	return err;
4356 4357
}

4358
int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4359
			 struct cfg80211_deauth_request *req)
4360
{
4361
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4362
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4363
	bool tx = !req->local_state_change;
4364
	bool report_frame = false;
4365

J
Johannes Berg 已提交
4366 4367 4368
	sdata_info(sdata,
		   "deauthenticating from %pM by local choice (reason=%d)\n",
		   req->bssid, req->reason_code);
4369

4370
	if (ifmgd->auth_data) {
4371
		drv_mgd_prepare_tx(sdata->local, sdata);
4372 4373
		ieee80211_send_deauth_disassoc(sdata, req->bssid,
					       IEEE80211_STYPE_DEAUTH,
4374
					       req->reason_code, tx,
4375
					       frame_buf);
4376 4377
		ieee80211_destroy_auth_data(sdata, false);

4378
		report_frame = true;
4379
		goto out;
4380 4381
	}

4382 4383 4384 4385
	if (ifmgd->associated &&
	    ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       req->reason_code, tx, frame_buf);
4386
		report_frame = true;
4387
	}
4388

4389
 out:
4390
	if (report_frame)
4391 4392
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
4393

4394 4395
	return 0;
}
4396

4397
int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4398
			   struct cfg80211_disassoc_request *req)
J
Johannes Berg 已提交
4399
{
4400
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4401
	u8 bssid[ETH_ALEN];
4402
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
J
Johannes Berg 已提交
4403

J
Johannes Berg 已提交
4404 4405 4406 4407 4408 4409
	/*
	 * cfg80211 should catch this ... but it's racy since
	 * we can receive a disassoc frame, process it, hand it
	 * to cfg80211 while that's in a locked section already
	 * trying to tell us that the user wants to disconnect.
	 */
4410
	if (ifmgd->associated != req->bss)
4411 4412
		return -ENOLINK;

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Johannes Berg 已提交
4413 4414 4415
	sdata_info(sdata,
		   "disassociating from %pM by local choice (reason=%d)\n",
		   req->bss->bssid, req->reason_code);
4416

4417
	memcpy(bssid, req->bss->bssid, ETH_ALEN);
4418 4419 4420
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
			       req->reason_code, !req->local_state_change,
			       frame_buf);
4421

4422 4423
	cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
			      IEEE80211_DEAUTH_FRAME_LEN);
4424

4425 4426
	return 0;
}
4427

4428
void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4429 4430 4431
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

4432 4433 4434 4435 4436 4437 4438 4439 4440 4441 4442
	/*
	 * Make sure some work items will not run after this,
	 * they will not do anything but might not have been
	 * cancelled when disconnecting.
	 */
	cancel_work_sync(&ifmgd->monitor_work);
	cancel_work_sync(&ifmgd->beacon_connection_loss_work);
	cancel_work_sync(&ifmgd->request_smps_work);
	cancel_work_sync(&ifmgd->csa_connection_drop_work);
	cancel_work_sync(&ifmgd->chswitch_work);

4443
	sdata_lock(sdata);
4444 4445
	if (ifmgd->assoc_data) {
		struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4446
		ieee80211_destroy_assoc_data(sdata, false);
4447 4448
		cfg80211_assoc_timeout(sdata->dev, bss);
	}
4449 4450 4451
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
	del_timer_sync(&ifmgd->timer);
4452
	sdata_unlock(sdata);
4453 4454
}

4455 4456 4457 4458 4459 4460
void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
			       enum nl80211_cqm_rssi_threshold_event rssi_event,
			       gfp_t gfp)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

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4461 4462
	trace_api_cqm_rssi_notify(sdata, rssi_event);

4463 4464 4465
	cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
}
EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);