mlme.c 122.4 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;
	}

	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;
			goto out;
		}

		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);
}

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static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
				 struct sk_buff *skb,
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				 struct ieee80211_supported_band *sband,
				 struct ieee80211_vht_cap *ap_vht_cap)
569 570 571 572 573 574 575 576
{
	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));
577
	ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
578 579 580 581

	/* 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;
	}

592 593 594 595 596 597 598 599
	/*
	 * 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;

600
	/* reserve and fill IE */
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	pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
602 603 604
	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;

621
	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;
	}
629
	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;

793
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
794
		ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
795
				    sband, chan, sdata->smps_mode);
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797
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
798 799
		ieee80211_add_vht_ie(sdata, skb, sband,
				     &assoc_data->ap_vht_cap);
800

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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;
	}

811 812
	if (assoc_data->wmm) {
		if (assoc_data->uapsd) {
813 814
			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;
842 843 844
	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);
}

848 849 850 851 852 853
void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_pspoll *pspoll;
	struct sk_buff *skb;

854 855
	skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
	if (!skb)
856 857
		return;

858 859
	pspoll = (struct ieee80211_pspoll *) skb->data;
	pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
860

861 862
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
863 864
}

865 866 867 868 869
void ieee80211_send_nullfunc(struct ieee80211_local *local,
			     struct ieee80211_sub_if_data *sdata,
			     int powersave)
{
	struct sk_buff *skb;
870
	struct ieee80211_hdr_3addr *nullfunc;
871
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
872

873 874
	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
	if (!skb)
875 876
		return;

877
	nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
878
	if (powersave)
879
		nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
880

881 882
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
					IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
883 884 885 886

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

887 888 889 890
	if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
			    IEEE80211_STA_CONNECTION_POLL))
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;

891
	ieee80211_tx_skb(sdata, skb);
892 893
}

894 895 896 897 898 899 900 901 902 903 904
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);
905
	if (!skb)
906
		return;
907

908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923
	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);
}

924 925 926 927 928
/* 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);
929
	struct ieee80211_local *local = sdata->local;
930 931
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

932
	if (!ieee80211_sdata_running(sdata))
933 934
		return;

935
	sdata_lock(sdata);
936 937
	if (!ifmgd->associated)
		goto out;
938

939
	local->_oper_chandef = local->csa_chandef;
940 941

	if (!local->ops->channel_switch) {
942
		/* call "hw_config" only if doing sw channel switch */
943
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
944 945
	} else {
		/* update the device channel directly */
946
		local->hw.conf.chandef = local->_oper_chandef;
947
	}
948

949
	/* XXX: shouldn't really modify cfg80211-owned data! */
950
	ifmgd->associated->channel = local->_oper_chandef.chan;
951

952
	/* XXX: wait for a beacon first? */
953
	ieee80211_wake_queues_by_reason(&local->hw,
954
					IEEE80211_MAX_QUEUE_MAP,
955
					IEEE80211_QUEUE_STOP_REASON_CSA);
956 957
 out:
	ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
958
	sdata_unlock(sdata);
959 960
}

961 962
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;
965 966 967

	trace_api_chswitch_done(sdata, success);
	if (!success) {
968 969 970 971 972 973
		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);
974 975 976 977
	}
}
EXPORT_SYMBOL(ieee80211_chswitch_done);

978 979 980 981
static void ieee80211_chswitch_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
982

983
	ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
984 985
}

986
static void
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ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
988 989
				 u64 timestamp, struct ieee802_11_elems *elems,
				 bool beacon)
990
{
991
	struct ieee80211_local *local = sdata->local;
992
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
993 994
	struct cfg80211_bss *cbss = ifmgd->associated;
	struct ieee80211_bss *bss;
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	struct ieee80211_chanctx *chanctx;
996 997 998 999 1000
	enum ieee80211_band new_band;
	int new_freq;
	u8 new_chan_no;
	u8 count;
	u8 mode;
1001
	struct ieee80211_channel *new_chan;
1002
	struct cfg80211_chan_def new_chandef = {};
1003 1004 1005
	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;
1006
	const struct ieee80211_ht_operation *ht_oper;
1007
	int secondary_channel_offset = -1;
1008

1009
	sdata_assert_lock(sdata);
1010

1011
	if (!cbss)
1012 1013
		return;

1014
	if (local->scanning)
1015 1016
		return;

1017
	/* disregard subsequent announcements if we are already processing */
1018 1019 1020
	if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
		return;

1021 1022
	sec_chan_offs = elems->sec_chan_offs;
	wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
1023
	ht_oper = elems->ht_operation;
1024 1025 1026 1027 1028

	if (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
			    IEEE80211_STA_DISABLE_40MHZ)) {
		sec_chan_offs = NULL;
		wide_bw_chansw_ie = NULL;
1029 1030
		/* only used for bandwidth here */
		ht_oper = NULL;
1031 1032
	}

1033 1034
	if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
		wide_bw_chansw_ie = NULL;
1035

1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055
	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 */
1056
		return;
1057
	}
1058 1059 1060

	bss = (void *)cbss->priv;

1061
	new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band);
1062 1063
	new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
	if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) {
1064 1065 1066
		sdata_info(sdata,
			   "AP %pM switches to unsupported channel (%d MHz), disconnecting\n",
			   ifmgd->associated->bssid, new_freq);
1067
		ieee80211_queue_work(&local->hw,
1068
				     &ifmgd->csa_connection_drop_work);
1069
		return;
1070
	}
1071

1072
	if (!beacon && sec_chan_offs) {
1073
		secondary_channel_offset = sec_chan_offs->sec_chan_offs;
1074 1075 1076
	} else if (beacon && ht_oper) {
		secondary_channel_offset =
			ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET;
1077
	} else if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
1078 1079 1080 1081 1082 1083 1084 1085
		/*
		 * 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).
		 */
1086 1087 1088
		secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
	}

1089 1090 1091 1092
	switch (secondary_channel_offset) {
	default:
		/* secondary_channel_offset was present but is invalid */
	case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1093
		cfg80211_chandef_create(&new_chandef, new_chan,
1094 1095 1096
					NL80211_CHAN_HT20);
		break;
	case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1097
		cfg80211_chandef_create(&new_chandef, new_chan,
1098 1099 1100
					NL80211_CHAN_HT40PLUS);
		break;
	case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1101
		cfg80211_chandef_create(&new_chandef, new_chan,
1102 1103 1104
					NL80211_CHAN_HT40MINUS);
		break;
	case -1:
1105
		cfg80211_chandef_create(&new_chandef, new_chan,
1106 1107 1108 1109
					NL80211_CHAN_NO_HT);
		break;
	}

1110 1111 1112 1113 1114 1115 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
	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;
	}

1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174
	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;
	}

1175 1176
	ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;

1177
	if (local->use_chanctx) {
J
Johannes Berg 已提交
1178 1179
		sdata_info(sdata,
			   "not handling channel switch with channel contexts\n");
1180
		ieee80211_queue_work(&local->hw,
J
Johannes Berg 已提交
1181
				     &ifmgd->csa_connection_drop_work);
1182
		return;
J
Johannes Berg 已提交
1183 1184
	}

1185
	mutex_lock(&local->chanctx_mtx);
J
Johannes Berg 已提交
1186
	if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
1187
		mutex_unlock(&local->chanctx_mtx);
J
Johannes Berg 已提交
1188 1189 1190 1191 1192 1193 1194
		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");
1195
		ieee80211_queue_work(&local->hw,
J
Johannes Berg 已提交
1196
				     &ifmgd->csa_connection_drop_work);
1197
		mutex_unlock(&local->chanctx_mtx);
J
Johannes Berg 已提交
1198 1199
		return;
	}
1200
	mutex_unlock(&local->chanctx_mtx);
J
Johannes Berg 已提交
1201

1202
	local->csa_chandef = new_chandef;
J
Johannes Berg 已提交
1203

1204 1205
	if (mode)
		ieee80211_stop_queues_by_reason(&local->hw,
1206
				IEEE80211_MAX_QUEUE_MAP,
1207 1208
				IEEE80211_QUEUE_STOP_REASON_CSA);

1209
	if (local->ops->channel_switch) {
1210
		/* use driver's channel switch callback */
1211 1212
		struct ieee80211_channel_switch ch_switch = {
			.timestamp = timestamp,
1213
			.block_tx = mode,
1214
			.chandef = new_chandef,
1215
			.count = count,
1216 1217
		};

1218
		drv_channel_switch(local, &ch_switch);
1219 1220 1221 1222
		return;
	}

	/* channel switch handled in software */
1223 1224
	if (count <= 1)
		ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1225
	else
1226
		mod_timer(&ifmgd->chswitch_timer,
1227
			  TU_TO_EXP_TIME(count * cbss->beacon_interval));
1228 1229
}

1230 1231 1232 1233
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)
1234
{
1235 1236 1237 1238
	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;
1239

1240 1241
	/* Invalid IE */
	if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1242
		return 0;
1243

1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257
	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;
1258
	}
1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282

	/* 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)
1283
		return 0;
1284 1285 1286

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

1287 1288
	if (sdata->ap_power_level == new_ap_level)
		return 0;
1289 1290 1291 1292 1293

	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);
1294 1295 1296 1297
	sdata->ap_power_level = new_ap_level;
	if (__ieee80211_recalc_txpower(sdata))
		return BSS_CHANGED_TXPOWER;
	return 0;
1298 1299
}

1300 1301 1302 1303 1304 1305
/* 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
1306 1307 1308 1309
	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
1310
	if (local->scanning)
J
Johannes Berg 已提交
1311 1312
		return;

1313 1314 1315 1316 1317 1318 1319
	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);
1320

1321 1322 1323 1324 1325 1326
		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);
1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343
	}
}

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);
	}
}

1344 1345 1346 1347
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
1348
	bool authorized = false;
1349 1350 1351 1352

	if (!mgd->powersave)
		return false;

1353 1354 1355
	if (mgd->broken_ap)
		return false;

1356 1357 1358 1359 1360 1361 1362
	if (!mgd->associated)
		return false;

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

1363 1364 1365
	if (!sdata->vif.bss_conf.dtim_period)
		return false;

1366 1367 1368
	rcu_read_lock();
	sta = sta_info_get(sdata, mgd->bssid);
	if (sta)
J
Johannes Berg 已提交
1369
		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1370 1371
	rcu_read_unlock();

J
Johannes Berg 已提交
1372
	return authorized;
1373 1374
}

1375
/* need to hold RTNL or interface lock */
1376
void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1377 1378 1379
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;
1380
	int timeout;
1381 1382 1383 1384 1385 1386 1387

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

	list_for_each_entry(sdata, &local->interfaces, list) {
1388
		if (!ieee80211_sdata_running(sdata))
1389
			continue;
1390 1391 1392 1393 1394 1395 1396 1397
		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;
		}
1398 1399 1400 1401 1402 1403
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

1404
	if (count == 1 && ieee80211_powersave_allowed(found)) {
1405 1406 1407
		s32 beaconint_us;

		if (latency < 0)
M
Mark Gross 已提交
1408
			latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1409 1410 1411 1412

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

1413
		timeout = local->dynamic_ps_forced_timeout;
1414 1415
		if (timeout < 0) {
			/*
1416 1417
			 * Go to full PSM if the user configures a very low
			 * latency requirement.
1418 1419 1420
			 * The 2000 second value is there for compatibility
			 * until the PM_QOS_NETWORK_LATENCY is configured
			 * with real values.
1421
			 */
1422 1423
			if (latency > (1900 * USEC_PER_MSEC) &&
			    latency != (2000 * USEC_PER_SEC))
1424
				timeout = 0;
1425 1426
			else
				timeout = 100;
1427
		}
1428
		local->hw.conf.dynamic_ps_timeout = timeout;
1429

1430
		if (beaconint_us > latency) {
1431
			local->ps_sdata = NULL;
1432 1433
		} else {
			int maxslp = 1;
1434
			u8 dtimper = found->u.mgd.dtim_period;
1435 1436 1437 1438 1439

			/* If the TIM IE is invalid, pretend the value is 1 */
			if (!dtimper)
				dtimper = 1;
			else if (dtimper > 1)
1440 1441 1442
				maxslp = min_t(int, dtimper,
						    latency / beaconint_us);

1443
			local->hw.conf.max_sleep_period = maxslp;
1444
			local->hw.conf.ps_dtim_period = dtimper;
1445
			local->ps_sdata = found;
1446
		}
1447
	} else {
1448
		local->ps_sdata = NULL;
1449
	}
1450 1451 1452 1453

	ieee80211_change_ps(local);
}

E
Eliad Peller 已提交
1454 1455 1456 1457 1458 1459 1460 1461 1462 1463
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);
	}
}

1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475
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,
1476
					IEEE80211_MAX_QUEUE_MAP,
1477 1478 1479 1480 1481 1482 1483 1484 1485
					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;
1486
	struct ieee80211_if_managed *ifmgd;
1487 1488
	unsigned long flags;
	int q;
1489 1490 1491 1492 1493

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

1494 1495
	ifmgd = &sdata->u.mgd;

1496 1497 1498
	if (local->hw.conf.flags & IEEE80211_CONF_PS)
		return;

1499
	if (local->hw.conf.dynamic_ps_timeout > 0) {
1500 1501
		/* don't enter PS if TX frames are pending */
		if (drv_tx_frames_pending(local)) {
1502 1503 1504 1505 1506
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
			return;
		}
1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524

		/*
		 * 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);
1525 1526
	}

1527
	if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1528
	    !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1529
		if (drv_tx_frames_pending(local)) {
1530 1531 1532
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
1533
		} else {
1534 1535
			ieee80211_send_nullfunc(local, sdata, 1);
			/* Flush to get the tx status of nullfunc frame */
1536
			ieee80211_flush_queues(local, sdata);
1537
		}
1538 1539
	}

1540 1541
	if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
	      (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1542 1543 1544 1545 1546
	    (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);
	}
1547 1548 1549 1550 1551 1552
}

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

1553
	if (local->quiescing || local->suspended)
1554 1555
		return;

1556
	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1557 1558
}

1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571
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
1572
/* MLME */
1573
static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1574
				     struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
1575
				     const u8 *wmm_param, size_t wmm_param_len)
1576 1577
{
	struct ieee80211_tx_queue_params params;
1578
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1579 1580
	size_t left;
	int count;
J
Johannes Berg 已提交
1581 1582
	const u8 *pos;
	u8 uapsd_queues = 0;
1583

1584
	if (!local->ops->conf_tx)
1585
		return false;
1586

J
Johannes Berg 已提交
1587
	if (local->hw.queues < IEEE80211_NUM_ACS)
1588
		return false;
1589 1590

	if (!wmm_param)
1591
		return false;
1592

1593
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1594
		return false;
K
Kalle Valo 已提交
1595 1596

	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1597
		uapsd_queues = ifmgd->uapsd_queues;
K
Kalle Valo 已提交
1598

1599
	count = wmm_param[6] & 0x0f;
1600
	if (count == ifmgd->wmm_last_param_set)
1601
		return false;
1602
	ifmgd->wmm_last_param_set = count;
1603 1604 1605 1606 1607 1608

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

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

Y
Yoni Divinsky 已提交
1609
	sdata->wmm_acm = 0;
1610 1611 1612
	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
1613
		bool uapsd = false;
1614 1615 1616
		int queue;

		switch (aci) {
1617
		case 1: /* AC_BK */
J
Johannes Berg 已提交
1618
			queue = 3;
J
Johannes Berg 已提交
1619
			if (acm)
Y
Yoni Divinsky 已提交
1620
				sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
K
Kalle Valo 已提交
1621 1622
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
				uapsd = true;
1623
			break;
1624
		case 2: /* AC_VI */
J
Johannes Berg 已提交
1625
			queue = 1;
J
Johannes Berg 已提交
1626
			if (acm)
Y
Yoni Divinsky 已提交
1627
				sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
K
Kalle Valo 已提交
1628 1629
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
				uapsd = true;
1630
			break;
1631
		case 3: /* AC_VO */
J
Johannes Berg 已提交
1632
			queue = 0;
J
Johannes Berg 已提交
1633
			if (acm)
Y
Yoni Divinsky 已提交
1634
				sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
K
Kalle Valo 已提交
1635 1636
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
				uapsd = true;
1637
			break;
1638
		case 0: /* AC_BE */
1639
		default:
J
Johannes Berg 已提交
1640
			queue = 2;
J
Johannes Berg 已提交
1641
			if (acm)
Y
Yoni Divinsky 已提交
1642
				sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
K
Kalle Valo 已提交
1643 1644
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
				uapsd = true;
1645 1646 1647 1648 1649 1650
			break;
		}

		params.aifs = pos[0] & 0x0f;
		params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params.cw_min = ecw2cw(pos[1] & 0x0f);
1651
		params.txop = get_unaligned_le16(pos + 2);
1652
		params.acm = acm;
K
Kalle Valo 已提交
1653 1654
		params.uapsd = uapsd;

J
Johannes Berg 已提交
1655 1656 1657 1658 1659
		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);
1660 1661
		sdata->tx_conf[queue] = params;
		if (drv_conf_tx(local, sdata, queue, &params))
J
Johannes Berg 已提交
1662 1663 1664
			sdata_err(sdata,
				  "failed to set TX queue parameters for queue %d\n",
				  queue);
1665
	}
1666 1667

	/* enable WMM or activate new settings */
1668
	sdata->vif.bss_conf.qos = true;
1669
	return true;
1670 1671
}

1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687
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
1688 1689
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
1690
{
J
Johannes Berg 已提交
1691
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1692
	u32 changed = 0;
J
Johannes Berg 已提交
1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705
	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
1706
	if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1707
		use_short_slot = true;
1708

1709 1710 1711
	if (use_protection != bss_conf->use_cts_prot) {
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
1712
	}
1713

1714 1715
	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
1716
		changed |= BSS_CHANGED_ERP_PREAMBLE;
1717
	}
1718

J
Johannes Berg 已提交
1719 1720 1721
	if (use_short_slot != bss_conf->use_short_slot) {
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
1722 1723 1724 1725 1726
	}

	return changed;
}

1727
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1728
				     struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
1729
				     u32 bss_info_changed)
1730
{
1731
	struct ieee80211_bss *bss = (void *)cbss->priv;
1732
	struct ieee80211_local *local = sdata->local;
1733
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1734

J
Johannes Berg 已提交
1735
	bss_info_changed |= BSS_CHANGED_ASSOC;
1736
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1737
		bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1738

1739
	sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1740
		beacon_loss_count * bss_conf->beacon_int));
1741

1742 1743
	sdata->u.mgd.associated = cbss;
	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1744

1745 1746
	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;

1747
	if (sdata->vif.p2p) {
1748
		const struct cfg80211_bss_ies *ies;
1749

1750 1751 1752 1753 1754 1755 1756 1757
		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
1758 1759
					(u8 *) &bss_conf->p2p_noa_attr,
					sizeof(bss_conf->p2p_noa_attr));
1760
			if (ret >= 2) {
J
Janusz Dziedzic 已提交
1761 1762
				sdata->u.mgd.p2p_noa_index =
					bss_conf->p2p_noa_attr.index;
1763 1764
				bss_info_changed |= BSS_CHANGED_P2P_PS;
			}
1765
		}
1766
		rcu_read_unlock();
1767 1768
	}

J
Johannes Berg 已提交
1769
	/* just to be sure */
1770
	ieee80211_stop_poll(sdata);
J
Johannes Berg 已提交
1771

1772
	ieee80211_led_assoc(local, 1);
1773

1774
	if (sdata->u.mgd.assoc_data->have_beacon) {
1775 1776 1777 1778 1779 1780 1781
		/*
		 * 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;
1782
		bss_info_changed |= BSS_CHANGED_DTIM_PERIOD;
1783
	} else {
1784
		bss_conf->dtim_period = 0;
1785
	}
1786

1787
	bss_conf->assoc = 1;
1788

1789
	/* Tell the driver to monitor connection quality (if supported) */
1790
	if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1791
	    bss_conf->cqm_rssi_thold)
1792 1793
		bss_info_changed |= BSS_CHANGED_CQM;

1794
	/* Enable ARP filtering */
1795
	if (bss_conf->arp_addr_cnt)
1796 1797
		bss_info_changed |= BSS_CHANGED_ARP_FILTER;

J
Johannes Berg 已提交
1798
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1799

J
Johannes Berg 已提交
1800 1801 1802
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
	mutex_unlock(&local->iflist_mtx);
1803

1804
	ieee80211_recalc_smps(sdata);
E
Eliad Peller 已提交
1805 1806
	ieee80211_recalc_ps_vif(sdata);

1807
	netif_carrier_on(sdata->dev);
1808 1809
}

1810
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1811 1812
				   u16 stype, u16 reason, bool tx,
				   u8 *frame_buf)
1813
{
1814
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1815
	struct ieee80211_local *local = sdata->local;
1816
	u32 changed = 0;
1817

1818
	sdata_assert_lock(sdata);
1819

1820 1821 1822
	if (WARN_ON_ONCE(tx && !frame_buf))
		return;

J
Johannes Berg 已提交
1823 1824 1825
	if (WARN_ON(!ifmgd->associated))
		return;

1826 1827
	ieee80211_stop_poll(sdata);

1828
	ifmgd->associated = NULL;
1829 1830
	netif_carrier_off(sdata->dev);

1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841
	/*
	 * 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
1842 1843 1844
	/* disable per-vif ps */
	ieee80211_recalc_ps_vif(sdata);

1845 1846
	/* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
	if (tx)
1847
		ieee80211_flush_queues(local, sdata);
1848

1849 1850
	/* deauthenticate/disassociate now */
	if (tx || frame_buf)
1851 1852
		ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
					       reason, tx, frame_buf);
1853 1854 1855

	/* flush out frame */
	if (tx)
1856
		ieee80211_flush_queues(local, sdata);
1857

1858 1859 1860
	/* clear bssid only after building the needed mgmt frames */
	memset(ifmgd->bssid, 0, ETH_ALEN);

1861
	/* remove AP and TDLS peers */
1862
	sta_info_flush_defer(sdata);
1863 1864

	/* finally reset all BSS / config parameters */
1865 1866 1867
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
J
Johannes Berg 已提交
1868 1869
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
1870

J
Janusz Dziedzic 已提交
1871 1872 1873
	ifmgd->p2p_noa_index = -1;
	memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
	       sizeof(sdata->vif.bss_conf.p2p_noa_attr));
1874

1875
	/* on the next assoc, re-program HT/VHT parameters */
B
Ben Greear 已提交
1876 1877
	memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
	memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1878 1879
	memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
	memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
1880

1881
	sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1882

1883 1884 1885
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

1886
	/* Disable ARP filtering */
1887
	if (sdata->vif.bss_conf.arp_addr_cnt)
1888 1889
		changed |= BSS_CHANGED_ARP_FILTER;

1890 1891 1892
	sdata->vif.bss_conf.qos = false;
	changed |= BSS_CHANGED_QOS;

1893 1894
	/* The BSSID (not really interesting) and HT changed */
	changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
J
Johannes Berg 已提交
1895
	ieee80211_bss_info_change_notify(sdata, changed);
1896

1897 1898 1899
	/* disassociated - set to defaults now */
	ieee80211_set_wmm_default(sdata, false);

1900 1901 1902 1903
	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);
1904

1905 1906
	sdata->vif.bss_conf.dtim_period = 0;

1907 1908
	ifmgd->flags = 0;
	ieee80211_vif_release_channel(sdata);
1909
}
1910

1911 1912 1913 1914 1915 1916 1917 1918
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
1919 1920
	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
1921
	 */
J
Johannes Berg 已提交
1922 1923 1924
	if (is_multicast_ether_addr(hdr->addr1))
		return;

1925
	ieee80211_sta_reset_conn_monitor(sdata);
1926
}
1927

1928 1929 1930
static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1931
	struct ieee80211_local *local = sdata->local;
1932

1933
	mutex_lock(&local->mtx);
1934
	if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1935 1936 1937 1938
			      IEEE80211_STA_CONNECTION_POLL))) {
		mutex_unlock(&local->mtx);
		return;
	}
1939

1940
	__ieee80211_stop_poll(sdata);
1941 1942 1943 1944

	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
	mutex_unlock(&local->iflist_mtx);
1945 1946

	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1947
		goto out;
1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958

	/*
	 * 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));
1959 1960
out:
	mutex_unlock(&local->mtx);
1961 1962 1963
}

void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1964
			     struct ieee80211_hdr *hdr, bool ack)
1965
{
F
Felix Fietkau 已提交
1966
	if (!ieee80211_is_data(hdr->frame_control))
1967 1968 1969 1970
	    return;

	if (ieee80211_is_nullfunc(hdr->frame_control) &&
	    sdata->u.mgd.probe_send_count > 0) {
1971
		if (ack)
1972
			ieee80211_sta_reset_conn_monitor(sdata);
1973 1974
		else
			sdata->u.mgd.nullfunc_failed = true;
1975
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1976
		return;
1977
	}
1978 1979 1980

	if (ack)
		ieee80211_sta_reset_conn_monitor(sdata);
1981 1982
}

1983 1984 1985 1986
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ssid;
1987
	u8 *dst = ifmgd->associated->bssid;
1988
	u8 unicast_limit = max(1, max_probe_tries - 3);
1989 1990 1991 1992 1993 1994 1995 1996

	/*
	 * 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;
1997

1998 1999 2000 2001 2002 2003 2004
	/*
	 * 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.
	 */
2005 2006
	ifmgd->probe_send_count++;

2007 2008
	if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
		ifmgd->nullfunc_failed = false;
2009
		ieee80211_send_nullfunc(sdata->local, sdata, 0);
2010
	} else {
2011 2012
		int ssid_len;

2013
		rcu_read_lock();
2014
		ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2015 2016 2017 2018 2019 2020
		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,
2021
					 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
2022
					 ifmgd->associated->channel, false);
2023
		rcu_read_unlock();
2024
	}
2025

2026
	ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2027
	run_again(sdata, ifmgd->probe_timeout);
2028
	if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2029
		ieee80211_flush_queues(sdata->local, sdata);
2030 2031
}

J
Johannes Berg 已提交
2032 2033
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
				   bool beacon)
2034 2035
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
2036
	bool already = false;
2037

2038
	if (!ieee80211_sdata_running(sdata))
2039 2040
		return;

2041
	sdata_lock(sdata);
2042 2043 2044 2045

	if (!ifmgd->associated)
		goto out;

2046 2047 2048 2049 2050 2051 2052
	mutex_lock(&sdata->local->mtx);

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

2053
	if (beacon) {
J
Johannes Berg 已提交
2054
		mlme_dbg_ratelimited(sdata,
2055 2056
				     "detected beacon loss from AP (missed %d beacons) - probing\n",
				     beacon_loss_count);
J
Johannes Berg 已提交
2057

2058 2059 2060 2061
		ieee80211_cqm_rssi_notify(&sdata->vif,
					  NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
					  GFP_KERNEL);
	}
2062

J
Johannes Berg 已提交
2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082
	/*
	 * 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;

2083 2084
	mutex_unlock(&sdata->local->mtx);

J
Johannes Berg 已提交
2085 2086 2087
	if (already)
		goto out;

2088 2089 2090 2091
	mutex_lock(&sdata->local->iflist_mtx);
	ieee80211_recalc_ps(sdata->local, -1);
	mutex_unlock(&sdata->local->iflist_mtx);

2092 2093
	ifmgd->probe_send_count = 0;
	ieee80211_mgd_probe_ap_send(sdata);
2094
 out:
2095
	sdata_unlock(sdata);
2096 2097
}

2098 2099 2100 2101 2102
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;
2103
	struct cfg80211_bss *cbss;
2104 2105
	struct sk_buff *skb;
	const u8 *ssid;
2106
	int ssid_len;
2107 2108 2109 2110

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

2111
	sdata_assert_lock(sdata);
2112

2113 2114 2115 2116 2117 2118 2119
	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
2120 2121
		return NULL;

2122
	rcu_read_lock();
2123
	ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2124 2125 2126 2127 2128
	if (WARN_ON_ONCE(ssid == NULL))
		ssid_len = 0;
	else
		ssid_len = ssid[1];

2129
	skb = ieee80211_build_probe_req(sdata, cbss->bssid,
J
Johannes Berg 已提交
2130
					(u32) -1, cbss->channel,
2131
					ssid + 2, ssid_len,
2132
					NULL, 0, true);
2133
	rcu_read_unlock();
2134 2135 2136 2137 2138

	return skb;
}
EXPORT_SYMBOL(ieee80211_ap_probereq_get);

2139
static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2140 2141
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2142
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2143

2144
	sdata_lock(sdata);
2145
	if (!ifmgd->associated) {
2146
		sdata_unlock(sdata);
2147 2148 2149
		return;
	}

2150 2151
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
			       WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2152
			       true, frame_buf);
2153
	ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
2154
	ieee80211_wake_queues_by_reason(&sdata->local->hw,
2155
					IEEE80211_MAX_QUEUE_MAP,
2156
					IEEE80211_QUEUE_STOP_REASON_CSA);
2157

2158
	cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
2159
	sdata_unlock(sdata);
2160 2161
}

2162
static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
J
Johannes Berg 已提交
2163 2164 2165
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
2166
			     u.mgd.beacon_connection_loss_work);
2167 2168 2169 2170
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct sta_info *sta;

	if (ifmgd->associated) {
2171
		rcu_read_lock();
2172 2173 2174
		sta = sta_info_get(sdata, ifmgd->bssid);
		if (sta)
			sta->beacon_loss_count++;
2175
		rcu_read_unlock();
2176
	}
J
Johannes Berg 已提交
2177

2178
	if (ifmgd->connection_loss) {
2179 2180
		sdata_info(sdata, "Connection to AP %pM lost\n",
			   ifmgd->bssid);
2181
		__ieee80211_disconnect(sdata);
2182
	} else {
2183
		ieee80211_mgd_probe_ap(sdata, true);
2184 2185 2186 2187 2188 2189 2190 2191 2192
	}
}

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);

2193
	__ieee80211_disconnect(sdata);
J
Johannes Berg 已提交
2194 2195
}

2196 2197 2198
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2199
	struct ieee80211_hw *hw = &sdata->local->hw;
2200

J
Johannes Berg 已提交
2201 2202
	trace_api_beacon_loss(sdata);

2203
	sdata->u.mgd.connection_loss = false;
2204
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2205 2206 2207
}
EXPORT_SYMBOL(ieee80211_beacon_loss);

2208 2209 2210 2211 2212
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
2213 2214
	trace_api_connection_loss(sdata);

2215
	sdata->u.mgd.connection_loss = true;
2216 2217 2218 2219 2220
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_connection_loss);


J
Johannes Berg 已提交
2221 2222 2223 2224 2225
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;

2226
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2227 2228 2229 2230 2231 2232

	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);
2233
		sdata->u.mgd.flags = 0;
J
Johannes Berg 已提交
2234
		ieee80211_vif_release_channel(sdata);
J
Johannes Berg 已提交
2235 2236
	}

2237
	cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
J
Johannes Berg 已提交
2238 2239 2240 2241 2242 2243 2244
	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)
{
2245
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
2246 2247 2248
	struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
	u8 *pos;
	struct ieee802_11_elems elems;
2249
	u32 tx_flags = 0;
J
Johannes Berg 已提交
2250 2251

	pos = mgmt->u.auth.variable;
2252
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2253 2254 2255
	if (!elems.challenge)
		return;
	auth_data->expected_transaction = 4;
J
Johannes Berg 已提交
2256
	drv_mgd_prepare_tx(sdata->local, sdata);
2257 2258 2259
	if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
		tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
			   IEEE80211_TX_INTFL_MLME_CONN_TX;
2260
	ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
J
Johannes Berg 已提交
2261 2262 2263
			    elems.challenge - 2, elems.challenge_len + 2,
			    auth_data->bss->bssid, auth_data->bss->bssid,
			    auth_data->key, auth_data->key_len,
2264
			    auth_data->key_idx, tx_flags);
J
Johannes Berg 已提交
2265 2266
}

2267 2268
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
2269 2270 2271 2272 2273 2274
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u8 bssid[ETH_ALEN];
	u16 auth_alg, auth_transaction, status_code;
	struct sta_info *sta;

2275
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2276 2277

	if (len < 24 + 6)
2278
		return;
J
Johannes Berg 已提交
2279 2280

	if (!ifmgd->auth_data || ifmgd->auth_data->done)
2281
		return;
J
Johannes Berg 已提交
2282 2283 2284

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

2285
	if (!ether_addr_equal(bssid, mgmt->bssid))
2286
		return;
J
Johannes Berg 已提交
2287 2288 2289 2290 2291 2292

	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 ||
2293 2294 2295 2296 2297
	    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);
2298
		return;
2299
	}
J
Johannes Berg 已提交
2300 2301

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
2302 2303
		sdata_info(sdata, "%pM denied authentication (status %d)\n",
			   mgmt->sa, status_code);
2304
		ieee80211_destroy_auth_data(sdata, false);
2305 2306
		cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, len);
		return;
J
Johannes Berg 已提交
2307 2308 2309 2310 2311 2312
	}

	switch (ifmgd->auth_data->algorithm) {
	case WLAN_AUTH_OPEN:
	case WLAN_AUTH_LEAP:
	case WLAN_AUTH_FT:
2313
	case WLAN_AUTH_SAE:
J
Johannes Berg 已提交
2314 2315 2316 2317 2318
		break;
	case WLAN_AUTH_SHARED_KEY:
		if (ifmgd->auth_data->expected_transaction != 4) {
			ieee80211_auth_challenge(sdata, mgmt, len);
			/* need another frame */
2319
			return;
J
Johannes Berg 已提交
2320 2321 2322 2323 2324
		}
		break;
	default:
		WARN_ONCE(1, "invalid auth alg %d",
			  ifmgd->auth_data->algorithm);
2325
		return;
J
Johannes Berg 已提交
2326 2327
	}

J
Johannes Berg 已提交
2328
	sdata_info(sdata, "authenticated\n");
J
Johannes Berg 已提交
2329 2330
	ifmgd->auth_data->done = true;
	ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2331
	ifmgd->auth_data->timeout_started = true;
2332
	run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
2333

2334 2335 2336 2337 2338 2339
	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.
		 */
2340 2341
		cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, len);
		return;
2342 2343
	}

J
Johannes Berg 已提交
2344 2345 2346 2347 2348 2349 2350 2351
	/* 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
2352
		sdata_info(sdata, "failed moving %pM to auth\n", bssid);
J
Johannes Berg 已提交
2353 2354 2355 2356
		goto out_err;
	}
	mutex_unlock(&sdata->local->sta_mtx);

2357 2358
	cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, len);
	return;
J
Johannes Berg 已提交
2359 2360 2361 2362 2363 2364
 out_err:
	mutex_unlock(&sdata->local->sta_mtx);
	/* ignore frame -- wait for timeout */
}


2365 2366
static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
2367
{
2368
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2369
	const u8 *bssid = NULL;
2370 2371
	u16 reason_code;

2372
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2373

2374
	if (len < 24 + 2)
2375
		return;
2376

J
Johannes Berg 已提交
2377
	if (!ifmgd->associated ||
2378
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2379
		return;
2380

2381
	bssid = ifmgd->associated->bssid;
2382 2383 2384

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

J
Johannes Berg 已提交
2385 2386
	sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
		   bssid, reason_code);
2387

2388 2389
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2390
	cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, len);
2391 2392 2393
}


2394 2395
static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_mgmt *mgmt, size_t len)
2396
{
2397
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2398 2399
	u16 reason_code;

2400
	sdata_assert_lock(sdata);
2401

J
Johannes Berg 已提交
2402
	if (len < 24 + 2)
2403
		return;
2404

J
Johannes Berg 已提交
2405
	if (!ifmgd->associated ||
2406
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2407
		return;
2408 2409 2410

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

J
Johannes Berg 已提交
2411 2412
	sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
		   mgmt->sa, reason_code);
2413

2414 2415
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2416
	cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, len);
2417 2418
}

2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 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
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;
			}
		}
	}
}
2460

J
Johannes Berg 已提交
2461 2462 2463 2464 2465
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;

2466
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2467 2468 2469 2470 2471 2472

	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);
2473
		sdata->u.mgd.flags = 0;
J
Johannes Berg 已提交
2474
		ieee80211_vif_release_channel(sdata);
J
Johannes Berg 已提交
2475 2476 2477 2478 2479 2480 2481 2482
	}

	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
2483
				    struct ieee80211_mgmt *mgmt, size_t len)
2484
{
2485
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2486
	struct ieee80211_local *local = sdata->local;
2487
	struct ieee80211_supported_band *sband;
2488
	struct sta_info *sta;
J
Johannes Berg 已提交
2489 2490
	u8 *pos;
	u16 capab_info, aid;
2491
	struct ieee802_11_elems elems;
J
Johannes Berg 已提交
2492
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
J
Johannes Berg 已提交
2493
	u32 changed = 0;
2494
	int err;
2495

J
Johannes Berg 已提交
2496
	/* AssocResp and ReassocResp have identical structure */
2497 2498

	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
J
Johannes Berg 已提交
2499
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2500

2501
	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
J
Johannes Berg 已提交
2502 2503
		sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
			   aid);
2504 2505
	aid &= ~(BIT(15) | BIT(14));

2506 2507 2508
	ifmgd->broken_ap = false;

	if (aid == 0 || aid > IEEE80211_MAX_AID) {
J
Johannes Berg 已提交
2509 2510
		sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
			   aid);
2511 2512 2513 2514
		aid = 0;
		ifmgd->broken_ap = true;
	}

J
Johannes Berg 已提交
2515
	pos = mgmt->u.assoc_resp.variable;
2516
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2517

2518
	if (!elems.supp_rates) {
J
Johannes Berg 已提交
2519
		sdata_info(sdata, "no SuppRates element in AssocResp\n");
J
Johannes Berg 已提交
2520
		return false;
2521 2522
	}

2523
	ifmgd->aid = aid;
2524

2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542
	/*
	 * We previously checked these in the beacon/probe response, so
	 * they should be present here. This is just a safety net.
	 */
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	    (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
		sdata_info(sdata,
			   "HT AP is missing WMM params or HT capability/operation in AssocResp\n");
		return false;
	}

	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    (!elems.vht_cap_elem || !elems.vht_operation)) {
		sdata_info(sdata,
			   "VHT AP is missing VHT capability/operation in AssocResp\n");
		return false;
	}

2543 2544 2545 2546 2547
	mutex_lock(&sdata->local->sta_mtx);
	/*
	 * station info was already allocated and inserted before
	 * the association and should be available to us
	 */
2548
	sta = sta_info_get(sdata, cbss->bssid);
2549 2550
	if (WARN_ON(!sta)) {
		mutex_unlock(&sdata->local->sta_mtx);
J
Johannes Berg 已提交
2551
		return false;
2552
	}
2553

J
Johannes Berg 已提交
2554
	sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2555

2556
	/* Set up internal HT/VHT capabilities */
2557
	if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
B
Ben Greear 已提交
2558
		ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2559
						  elems.ht_cap_elem, sta);
2560

M
Mahesh Palivela 已提交
2561 2562
	if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
		ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2563
						    elems.vht_cap_elem, sta);
M
Mahesh Palivela 已提交
2564

2565 2566 2567 2568 2569 2570
	/*
	 * 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.
	 */
2571

2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586
	/*
	 * 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;
	}

2587
	rate_control_rate_init(sta);
2588

2589
	if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
J
Johannes Berg 已提交
2590
		set_sta_flag(sta, WLAN_STA_MFP);
2591

2592
	if (elems.wmm_param)
J
Johannes Berg 已提交
2593
		set_sta_flag(sta, WLAN_STA_WME);
2594

2595
	err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2596 2597 2598
	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
2599 2600 2601
		sdata_info(sdata,
			   "failed to move station %pM to desired state\n",
			   sta->sta.addr);
2602 2603 2604 2605 2606
		WARN_ON(__sta_info_destroy(sta));
		mutex_unlock(&sdata->local->sta_mtx);
		return false;
	}

2607
	mutex_unlock(&sdata->local->sta_mtx);
2608

2609 2610 2611 2612 2613 2614 2615 2616
	/*
	 * 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;

2617
	if (elems.wmm_param)
2618
		ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
J
Johannes Berg 已提交
2619
					 elems.wmm_param_len);
2620
	else
2621 2622
		ieee80211_set_wmm_default(sdata, false);
	changed |= BSS_CHANGED_QOS;
2623

J
Johannes Berg 已提交
2624 2625 2626 2627
	/* set AID and assoc capability,
	 * ieee80211_set_associated() will tell the driver */
	bss_conf->aid = aid;
	bss_conf->assoc_capability = capab_info;
2628
	ieee80211_set_associated(sdata, cbss, changed);
2629

2630 2631 2632 2633 2634 2635 2636
	/*
	 * 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);

2637
	/*
J
Johannes Berg 已提交
2638 2639
	 * Start timer to probe the connection to the AP now.
	 * Also start the timer that will detect beacon loss.
2640
	 */
J
Johannes Berg 已提交
2641
	ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2642
	ieee80211_sta_reset_beacon_monitor(sdata);
2643

J
Johannes Berg 已提交
2644
	return true;
2645 2646
}

2647 2648 2649
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
2650 2651 2652 2653 2654 2655 2656
{
	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;
2657
	struct cfg80211_bss *bss;
J
Johannes Berg 已提交
2658

2659
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2660 2661

	if (!assoc_data)
2662
		return;
2663
	if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2664
		return;
J
Johannes Berg 已提交
2665 2666 2667 2668 2669 2670 2671

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

	if (len < 24 + 6)
2672
		return;
J
Johannes Berg 已提交
2673 2674 2675 2676 2677 2678

	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
2679 2680 2681 2682
	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
2683 2684

	pos = mgmt->u.assoc_resp.variable;
2685
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2686 2687

	if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2688 2689
	    elems.timeout_int &&
	    elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
J
Johannes Berg 已提交
2690
		u32 tu, ms;
2691
		tu = le32_to_cpu(elems.timeout_int->value);
J
Johannes Berg 已提交
2692
		ms = tu * 1024 / 1000;
J
Johannes Berg 已提交
2693 2694 2695
		sdata_info(sdata,
			   "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
			   mgmt->sa, tu, ms);
J
Johannes Berg 已提交
2696
		assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2697
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
2698
		if (ms > IEEE80211_ASSOC_TIMEOUT)
2699 2700
			run_again(sdata, assoc_data->timeout);
		return;
J
Johannes Berg 已提交
2701 2702
	}

2703
	bss = assoc_data->bss;
J
Johannes Berg 已提交
2704 2705

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
2706 2707
		sdata_info(sdata, "%pM denied association (code=%d)\n",
			   mgmt->sa, status_code);
J
Johannes Berg 已提交
2708 2709
		ieee80211_destroy_assoc_data(sdata, false);
	} else {
2710
		if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
J
Johannes Berg 已提交
2711
			/* oops -- internal error -- send timeout for now */
2712
			ieee80211_destroy_assoc_data(sdata, false);
2713 2714 2715
			cfg80211_put_bss(sdata->local->hw.wiphy, bss);
			cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
			return;
J
Johannes Berg 已提交
2716
		}
2717
		sdata_info(sdata, "associated\n");
2718 2719 2720 2721 2722 2723 2724

		/*
		 * 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
2725 2726
	}

2727
	cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, len);
J
Johannes Berg 已提交
2728
}
J
Johannes Berg 已提交
2729

2730
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
2731
				  struct ieee80211_mgmt *mgmt, size_t len,
2732
				  struct ieee80211_rx_status *rx_status,
2733
				  struct ieee802_11_elems *elems)
2734 2735 2736
{
	struct ieee80211_local *local = sdata->local;
	int freq;
2737
	struct ieee80211_bss *bss;
2738
	struct ieee80211_channel *channel;
2739 2740
	bool need_ps = false;

2741
	sdata_assert_lock(sdata);
2742

2743 2744 2745 2746 2747
	if ((sdata->u.mgd.associated &&
	     ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) ||
	    (sdata->u.mgd.assoc_data &&
	     ether_addr_equal(mgmt->bssid,
			      sdata->u.mgd.assoc_data->bss->bssid))) {
2748
		/* not previously set so we may need to recalc */
2749 2750 2751
		need_ps = sdata->u.mgd.associated && !sdata->u.mgd.dtim_period;

		if (elems->tim && !elems->parse_error) {
J
Johannes Berg 已提交
2752
			const struct ieee80211_tim_ie *tim_ie = elems->tim;
2753 2754
			sdata->u.mgd.dtim_period = tim_ie->dtim_period;
		}
2755
	}
2756

2757
	if (elems->ds_params)
2758 2759
		freq = ieee80211_channel_to_frequency(elems->ds_params[0],
						      rx_status->band);
2760 2761 2762 2763 2764 2765 2766 2767 2768
	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,
2769
					channel);
2770 2771 2772
	if (bss)
		ieee80211_rx_bss_put(local, bss);

2773 2774
	if (!sdata->u.mgd.associated ||
	    !ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid))
2775 2776
		return;

2777 2778 2779 2780 2781 2782
	if (need_ps) {
		mutex_lock(&local->iflist_mtx);
		ieee80211_recalc_ps(local, -1);
		mutex_unlock(&local->iflist_mtx);
	}

2783 2784
	ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
					 elems, true);
2785

2786 2787 2788
}


2789
static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
2790
					 struct sk_buff *skb)
2791
{
J
Johannes Berg 已提交
2792
	struct ieee80211_mgmt *mgmt = (void *)skb->data;
2793
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
2794 2795
	struct ieee80211_rx_status *rx_status = (void *) skb->cb;
	size_t baselen, len = skb->len;
2796 2797
	struct ieee802_11_elems elems;

2798 2799
	ifmgd = &sdata->u.mgd;

2800
	sdata_assert_lock(sdata);
2801

2802
	if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2803 2804
		return; /* ignore ProbeResp to foreign address */

2805 2806 2807 2808 2809
	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
	if (baselen > len)
		return;

	ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2810
			       false, &elems);
2811

2812
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2813

2814
	if (ifmgd->associated &&
2815
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2816
		ieee80211_reset_ap_probe(sdata);
J
Johannes Berg 已提交
2817 2818

	if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2819
	    ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
J
Johannes Berg 已提交
2820
		/* got probe response, continue with auth */
J
Johannes Berg 已提交
2821
		sdata_info(sdata, "direct probe responded\n");
J
Johannes Berg 已提交
2822 2823
		ifmgd->auth_data->tries = 0;
		ifmgd->auth_data->timeout = jiffies;
2824
		ifmgd->auth_data->timeout_started = true;
2825
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
2826
	}
2827 2828
}

2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842
/*
 * 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 =
2843 2844 2845 2846 2847
	(1ULL << WLAN_EID_COUNTRY) |
	(1ULL << WLAN_EID_ERP_INFO) |
	(1ULL << WLAN_EID_CHANNEL_SWITCH) |
	(1ULL << WLAN_EID_PWR_CONSTRAINT) |
	(1ULL << WLAN_EID_HT_CAPABILITY) |
2848
	(1ULL << WLAN_EID_HT_OPERATION);
2849

2850 2851 2852
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)
2853
{
2854
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2855
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2856 2857
	size_t baselen;
	struct ieee802_11_elems elems;
2858
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
2859 2860
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
2861
	struct sta_info *sta;
2862
	u32 changed = 0;
2863
	bool erp_valid;
J
Johannes Berg 已提交
2864
	u8 erp_value = 0;
2865
	u32 ncrc;
2866
	u8 *bssid;
2867
	u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
2868

2869
	sdata_assert_lock(sdata);
2870

2871 2872 2873
	/* Process beacon from the current BSS */
	baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
	if (baselen > len)
2874
		return;
2875

J
Johannes Berg 已提交
2876 2877 2878 2879
	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		rcu_read_unlock();
2880
		return;
J
Johannes Berg 已提交
2881 2882
	}

2883
	if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
J
Johannes Berg 已提交
2884
		rcu_read_unlock();
2885
		return;
J
Johannes Berg 已提交
2886
	}
2887
	chan = chanctx_conf->def.chan;
J
Johannes Berg 已提交
2888
	rcu_read_unlock();
2889

2890
	if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2891
	    ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
J
Johannes Berg 已提交
2892
		ieee802_11_parse_elems(mgmt->u.beacon.variable,
2893
				       len - baselen, false, &elems);
2894

2895
		ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
J
Johannes Berg 已提交
2896
		ifmgd->assoc_data->have_beacon = true;
2897
		ifmgd->assoc_data->need_beacon = false;
2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908
		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
2909 2910
		/* continue assoc process */
		ifmgd->assoc_data->timeout = jiffies;
2911
		ifmgd->assoc_data->timeout_started = true;
2912 2913
		run_again(sdata, ifmgd->assoc_data->timeout);
		return;
J
Johannes Berg 已提交
2914
	}
2915

J
Johannes Berg 已提交
2916
	if (!ifmgd->associated ||
2917
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2918
		return;
J
Johannes Berg 已提交
2919
	bssid = ifmgd->associated->bssid;
2920

2921 2922 2923 2924
	/* 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;
2925
		ifmgd->ave_beacon_signal = rx_status->signal * 16;
2926
		ifmgd->last_cqm_event_signal = 0;
2927
		ifmgd->count_beacon_signal = 1;
2928
		ifmgd->last_ave_beacon_signal = 0;
2929 2930 2931 2932 2933
	} else {
		ifmgd->ave_beacon_signal =
			(IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
			 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
			 ifmgd->ave_beacon_signal) / 16;
2934
		ifmgd->count_beacon_signal++;
2935
	}
2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948

	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;
2949
			drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
2950 2951 2952 2953
		} else if (sig < ifmgd->rssi_min_thold &&
			   (last_sig >= ifmgd->rssi_max_thold ||
			   last_sig == 0)) {
			ifmgd->last_ave_beacon_signal = sig;
2954
			drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
2955 2956 2957
		}
	}

2958
	if (bss_conf->cqm_rssi_thold &&
2959
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2960
	    !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981
		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
2982
	if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
J
Johannes Berg 已提交
2983
		mlme_dbg_ratelimited(sdata,
2984
				     "cancelling AP probe due to a received beacon\n");
2985
		mutex_lock(&local->mtx);
J
Johannes Berg 已提交
2986
		ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2987 2988 2989
		ieee80211_run_deferred_scan(local);
		mutex_unlock(&local->mtx);

2990 2991 2992
		mutex_lock(&local->iflist_mtx);
		ieee80211_recalc_ps(local, -1);
		mutex_unlock(&local->iflist_mtx);
2993 2994
	}

J
Johannes Berg 已提交
2995 2996 2997 2998
	/*
	 * Push the beacon loss detection into the future since
	 * we are processing a beacon from the AP just now.
	 */
2999
	ieee80211_sta_reset_beacon_monitor(sdata);
J
Johannes Berg 已提交
3000

3001 3002
	ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
	ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3003
					  len - baselen, false, &elems,
3004 3005
					  care_about_ies, ncrc);

3006
	if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3007 3008 3009
		bool directed_tim = ieee80211_check_tim(elems.tim,
							elems.tim_len,
							ifmgd->aid);
3010
		if (directed_tim) {
3011
			if (local->hw.conf.dynamic_ps_timeout > 0) {
3012 3013 3014 3015 3016
				if (local->hw.conf.flags & IEEE80211_CONF_PS) {
					local->hw.conf.flags &= ~IEEE80211_CONF_PS;
					ieee80211_hw_config(local,
							    IEEE80211_CONF_CHANGE_PS);
				}
3017
				ieee80211_send_nullfunc(local, sdata, 0);
3018
			} else if (!local->pspolling && sdata->u.mgd.powersave) {
3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030
				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);
			}
3031 3032
		}
	}
J
Johannes Berg 已提交
3033

3034
	if (sdata->vif.p2p) {
J
Janusz Dziedzic 已提交
3035
		struct ieee80211_p2p_noa_attr noa = {};
3036 3037 3038 3039 3040
		int ret;

		ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
					    len - baselen,
					    IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3041
					    (u8 *) &noa, sizeof(noa));
J
Janusz Dziedzic 已提交
3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057
		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));
3058 3059 3060 3061 3062
			changed |= BSS_CHANGED_P2P_PS;
			ifmgd->beacon_crc_valid = false;
		}
	}

3063
	if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3064
		return;
3065
	ifmgd->beacon_crc = ncrc;
3066
	ifmgd->beacon_crc_valid = true;
3067

3068
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3069 3070 3071 3072 3073

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

3074 3075
	/*
	 * If we haven't had a beacon before, tell the driver about the
3076
	 * DTIM period (and beacon timing if desired) now.
3077 3078 3079 3080 3081 3082 3083
	 */
	if (!bss_conf->dtim_period) {
		/* 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;
3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096

		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;
		}

3097
		changed |= BSS_CHANGED_DTIM_PERIOD;
3098
		ieee80211_recalc_ps_vif(sdata);
3099 3100
	}

3101
	if (elems.erp_info) {
J
Johannes Berg 已提交
3102 3103 3104 3105
		erp_valid = true;
		erp_value = elems.erp_info[0];
	} else {
		erp_valid = false;
3106
	}
J
Johannes Berg 已提交
3107 3108 3109
	changed |= ieee80211_handle_bss_capability(sdata,
			le16_to_cpu(mgmt->u.beacon.capab_info),
			erp_valid, erp_value);
3110

3111
	mutex_lock(&local->sta_mtx);
3112 3113
	sta = sta_info_get(sdata, bssid);

3114 3115 3116 3117 3118 3119
	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);
3120 3121 3122
		cfg80211_send_deauth(sdata->dev, deauth_buf,
				     sizeof(deauth_buf));
		return;
3123
	}
3124 3125 3126 3127

	if (sta && elems.opmode_notif)
		ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
					    rx_status->band, true);
3128
	mutex_unlock(&local->sta_mtx);
3129

3130 3131 3132
	if (elems.country_elem && elems.pwr_constr_elem &&
	    mgmt->u.probe_resp.capab_info &
				cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
3133 3134 3135 3136
		changed |= ieee80211_handle_pwr_constr(sdata, chan,
						       elems.country_elem,
						       elems.country_elem_len,
						       elems.pwr_constr_elem);
3137

3138
	ieee80211_bss_info_change_notify(sdata, changed);
3139 3140
}

3141 3142
void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
				  struct sk_buff *skb)
3143 3144 3145 3146
{
	struct ieee80211_rx_status *rx_status;
	struct ieee80211_mgmt *mgmt;
	u16 fc;
3147 3148
	struct ieee802_11_elems elems;
	int ies_len;
3149 3150 3151 3152 3153

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

3154
	sdata_lock(sdata);
3155

J
Johannes Berg 已提交
3156 3157
	switch (fc & IEEE80211_FCTL_STYPE) {
	case IEEE80211_STYPE_BEACON:
3158
		ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
J
Johannes Berg 已提交
3159 3160 3161 3162 3163
		break;
	case IEEE80211_STYPE_PROBE_RESP:
		ieee80211_rx_mgmt_probe_resp(sdata, skb);
		break;
	case IEEE80211_STYPE_AUTH:
3164
		ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3165 3166
		break;
	case IEEE80211_STYPE_DEAUTH:
3167
		ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3168 3169
		break;
	case IEEE80211_STYPE_DISASSOC:
3170
		ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3171 3172 3173
		break;
	case IEEE80211_STYPE_ASSOC_RESP:
	case IEEE80211_STYPE_REASSOC_RESP:
3174
		ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3175 3176
		break;
	case IEEE80211_STYPE_ACTION:
3177
		if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3178 3179 3180
			ies_len = skb->len -
				  offsetof(struct ieee80211_mgmt,
					   u.action.u.chan_switch.variable);
3181 3182 3183 3184 3185 3186

			if (ies_len < 0)
				break;

			ieee802_11_parse_elems(
				mgmt->u.action.u.chan_switch.variable,
3187
				ies_len, true, &elems);
3188 3189 3190 3191

			if (elems.parse_error)
				break;

3192 3193
			ieee80211_sta_process_chanswitch(sdata,
							 rx_status->mactime,
3194
							 &elems, false);
3195 3196 3197 3198 3199 3200 3201 3202 3203 3204
		} 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,
3205
				ies_len, true, &elems);
3206 3207 3208 3209 3210 3211 3212 3213

			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
3214
			ieee80211_sta_process_chanswitch(sdata,
3215
							 rx_status->mactime,
3216
							 &elems, false);
3217
		}
3218
		break;
3219
	}
3220
	sdata_unlock(sdata);
3221 3222
}

J
Johannes Berg 已提交
3223
static void ieee80211_sta_timer(unsigned long data)
3224
{
J
Johannes Berg 已提交
3225 3226
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
3227

3228
	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3229 3230
}

3231
static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3232
					  u8 *bssid, u8 reason, bool tx)
3233
{
3234
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3235

3236
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3237
			       tx, frame_buf);
3238

3239
	cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
3240 3241
}

J
Johannes Berg 已提交
3242 3243 3244 3245 3246
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;
3247
	u32 tx_flags = 0;
J
Johannes Berg 已提交
3248

3249
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3250 3251 3252 3253 3254 3255 3256

	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
3257 3258
		sdata_info(sdata, "authentication with %pM timed out\n",
			   auth_data->bss->bssid);
J
Johannes Berg 已提交
3259 3260 3261 3262 3263 3264 3265 3266 3267 3268

		/*
		 * 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
3269 3270
	drv_mgd_prepare_tx(local, sdata);

J
Johannes Berg 已提交
3271
	if (auth_data->bss->proberesp_ies) {
3272 3273 3274
		u16 trans = 1;
		u16 status = 0;

J
Johannes Berg 已提交
3275 3276 3277
		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
3278 3279

		auth_data->expected_transaction = 2;
3280 3281 3282 3283 3284 3285 3286

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

3287 3288 3289 3290
		if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
			tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
				   IEEE80211_TX_INTFL_MLME_CONN_TX;

3291 3292
		ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
				    auth_data->data, auth_data->data_len,
J
Johannes Berg 已提交
3293
				    auth_data->bss->bssid,
3294 3295
				    auth_data->bss->bssid, NULL, 0, 0,
				    tx_flags);
J
Johannes Berg 已提交
3296 3297 3298
	} else {
		const u8 *ssidie;

J
Johannes Berg 已提交
3299 3300 3301
		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
3302

3303
		rcu_read_lock();
J
Johannes Berg 已提交
3304
		ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3305 3306
		if (!ssidie) {
			rcu_read_unlock();
J
Johannes Berg 已提交
3307
			return -EINVAL;
3308
		}
J
Johannes Berg 已提交
3309 3310 3311 3312 3313
		/*
		 * 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],
3314
					 NULL, 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
3315
					 auth_data->bss->channel, false);
3316
		rcu_read_unlock();
J
Johannes Berg 已提交
3317 3318
	}

3319
	if (tx_flags == 0) {
3320
		auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3321
		ifmgd->auth_data->timeout_started = true;
3322
		run_again(sdata, auth_data->timeout);
3323 3324
	} else {
		auth_data->timeout_started = false;
3325
	}
J
Johannes Berg 已提交
3326 3327 3328 3329 3330 3331 3332 3333 3334

	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;

3335
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3336 3337 3338

	assoc_data->tries++;
	if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
J
Johannes Berg 已提交
3339 3340
		sdata_info(sdata, "association with %pM timed out\n",
			   assoc_data->bss->bssid);
J
Johannes Berg 已提交
3341 3342 3343 3344 3345 3346 3347 3348 3349 3350

		/*
		 * 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
3351 3352 3353
	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
3354 3355
	ieee80211_send_assoc(sdata);

3356 3357
	if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
		assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3358
		assoc_data->timeout_started = true;
3359
		run_again(sdata, assoc_data->timeout);
3360 3361
	} else {
		assoc_data->timeout_started = false;
3362
	}
J
Johannes Berg 已提交
3363 3364 3365 3366

	return 0;
}

3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378
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);
}

3379
void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
3380 3381
{
	struct ieee80211_local *local = sdata->local;
3382
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3383

3384
	sdata_lock(sdata);
3385

3386 3387 3388 3389 3390 3391 3392 3393 3394 3395
	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;
3396
				run_again(sdata, ifmgd->auth_data->timeout);
3397 3398 3399
			} else {
				ifmgd->auth_data->timeout = jiffies - 1;
			}
3400
			ifmgd->auth_data->timeout_started = true;
3401 3402 3403 3404 3405 3406
		} 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;
3407
				run_again(sdata, ifmgd->assoc_data->timeout);
3408 3409 3410
			} else {
				ifmgd->assoc_data->timeout = jiffies - 1;
			}
3411
			ifmgd->assoc_data->timeout_started = true;
3412 3413 3414
		}
	}

3415
	if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
J
Johannes Berg 已提交
3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431
	    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);

			cfg80211_send_auth_timeout(sdata->dev, bssid);
		}
3432
	} else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3433
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
3434

3435
	if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
J
Johannes Berg 已提交
3436
	    time_after(jiffies, ifmgd->assoc_data->timeout)) {
3437 3438
		if ((ifmgd->assoc_data->need_beacon &&
		     !ifmgd->assoc_data->have_beacon) ||
J
Johannes Berg 已提交
3439 3440 3441 3442 3443 3444 3445 3446 3447
		    ieee80211_do_assoc(sdata)) {
			u8 bssid[ETH_ALEN];

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

			ieee80211_destroy_assoc_data(sdata, false);

			cfg80211_send_assoc_timeout(sdata->dev, bssid);
		}
3448
	} else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3449
		run_again(sdata, ifmgd->assoc_data->timeout);
J
Johannes Berg 已提交
3450

J
Johannes Berg 已提交
3451 3452 3453
	if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
			    IEEE80211_STA_CONNECTION_POLL) &&
	    ifmgd->associated) {
3454
		u8 bssid[ETH_ALEN];
3455
		int max_tries;
3456

3457
		memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3458

3459
		if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3460
			max_tries = max_nullfunc_tries;
3461
		else
3462
			max_tries = max_probe_tries;
3463

3464 3465 3466
		/* ACK received for nullfunc probing frame */
		if (!ifmgd->probe_send_count)
			ieee80211_reset_ap_probe(sdata);
3467 3468
		else if (ifmgd->nullfunc_failed) {
			if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3469 3470 3471 3472
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
					 bssid, ifmgd->probe_send_count,
					 max_tries);
3473 3474
				ieee80211_mgd_probe_ap_send(sdata);
			} else {
J
Johannes Berg 已提交
3475 3476 3477
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
					 bssid);
3478
				ieee80211_sta_connection_lost(sdata, bssid,
3479 3480
					WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
					false);
3481 3482
			}
		} else if (time_is_after_jiffies(ifmgd->probe_timeout))
3483
			run_again(sdata, ifmgd->probe_timeout);
3484
		else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
J
Johannes Berg 已提交
3485 3486 3487
			mlme_dbg(sdata,
				 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
				 bssid, probe_wait_ms);
3488
			ieee80211_sta_connection_lost(sdata, bssid,
3489
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3490
		} else if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3491 3492 3493 3494
			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);
3495 3496
			ieee80211_mgd_probe_ap_send(sdata);
		} else {
J
Johannes Berg 已提交
3497 3498 3499 3500
			/*
			 * We actually lost the connection ... or did we?
			 * Let's make sure!
			 */
3501 3502 3503 3504
			wiphy_debug(local->hw.wiphy,
				    "%s: No probe response from AP %pM"
				    " after %dms, disconnecting.\n",
				    sdata->name,
3505
				    bssid, probe_wait_ms);
3506

3507
			ieee80211_sta_connection_lost(sdata, bssid,
3508
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
J
Johannes Berg 已提交
3509 3510 3511
		}
	}

3512
	sdata_unlock(sdata);
3513 3514
}

J
Johannes Berg 已提交
3515 3516 3517 3518 3519 3520 3521 3522 3523
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;

3524
	sdata->u.mgd.connection_loss = false;
3525 3526
	ieee80211_queue_work(&sdata->local->hw,
			     &sdata->u.mgd.beacon_connection_loss_work);
J
Johannes Berg 已提交
3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538
}

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;

3539
	ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
J
Johannes Berg 已提交
3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550
}

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
3551 3552
static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
3553 3554
	u32 flags;

3555
	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3556
		__ieee80211_stop_poll(sdata);
3557

J
Johannes Berg 已提交
3558
		/* let's probe the connection once */
3559 3560 3561 3562
		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
3563
		/* and do all the other regular work too */
J
Johannes Berg 已提交
3564
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3565
	}
J
Johannes Berg 已提交
3566
}
3567

3568 3569 3570 3571 3572
#ifdef CONFIG_PM
void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

3573
	sdata_lock(sdata);
3574
	if (!ifmgd->associated) {
3575
		sdata_unlock(sdata);
3576 3577 3578 3579 3580 3581 3582 3583 3584 3585
		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);
3586
		sdata_unlock(sdata);
3587 3588
		return;
	}
3589
	sdata_unlock(sdata);
3590 3591 3592
}
#endif

J
Johannes Berg 已提交
3593 3594
/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3595
{
3596
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
3597

3598
	ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3599
	INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3600
	INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3601 3602
	INIT_WORK(&ifmgd->beacon_connection_loss_work,
		  ieee80211_beacon_connection_loss_work);
3603 3604
	INIT_WORK(&ifmgd->csa_connection_drop_work,
		  ieee80211_csa_connection_drop_work);
3605
	INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3606
	setup_timer(&ifmgd->timer, ieee80211_sta_timer,
S
Sujith 已提交
3607
		    (unsigned long) sdata);
J
Johannes Berg 已提交
3608 3609 3610 3611
	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);
3612
	setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
J
Johannes Berg 已提交
3613 3614
		    (unsigned long) sdata);

3615
	ifmgd->flags = 0;
3616
	ifmgd->powersave = sdata->wdev.ps;
3617 3618
	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
3619
	ifmgd->p2p_noa_index = -1;
J
Johannes Berg 已提交
3620

3621 3622 3623 3624
	if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
		ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
	else
		ifmgd->req_smps = IEEE80211_SMPS_OFF;
3625 3626
}

3627 3628
/* scan finished notification */
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
J
Johannes Berg 已提交
3629
{
3630
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
3631

3632 3633
	/* Restart STA timers */
	rcu_read_lock();
3634 3635 3636 3637
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (ieee80211_sdata_running(sdata))
			ieee80211_restart_sta_timer(sdata);
	}
3638 3639
	rcu_read_unlock();
}
J
Johannes Berg 已提交
3640

3641 3642 3643 3644 3645 3646 3647
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);
3648

3649 3650 3651
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, latency_usec);
	mutex_unlock(&local->iflist_mtx);
3652

3653
	return 0;
J
Johannes Berg 已提交
3654 3655
}

J
Johannes Berg 已提交
3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667
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;

3668
	ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
J
Johannes Berg 已提交
3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680
	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;

3681
	vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
J
Johannes Berg 已提交
3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699
	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;
}

3700 3701
static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
				  struct cfg80211_bss *cbss)
3702 3703 3704
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3705
	const struct ieee80211_ht_operation *ht_oper = NULL;
J
Johannes Berg 已提交
3706
	const struct ieee80211_vht_operation *vht_oper = NULL;
3707
	struct ieee80211_supported_band *sband;
3708
	struct cfg80211_chan_def chandef;
J
Johannes Berg 已提交
3709
	int ret;
3710

3711 3712
	sband = local->hw.wiphy->bands[cbss->channel->band];

J
Johannes Berg 已提交
3713 3714 3715 3716
	ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
			  IEEE80211_STA_DISABLE_80P80MHZ |
			  IEEE80211_STA_DISABLE_160MHZ);

3717 3718
	rcu_read_lock();

J
Johannes Berg 已提交
3719 3720
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	    sband->ht_cap.ht_supported) {
3721
		const u8 *ht_oper_ie, *ht_cap;
3722

3723
		ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3724 3725
		if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
			ht_oper = (void *)(ht_oper_ie + 2);
3726 3727 3728 3729 3730 3731

		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;
		}
3732 3733
	}

J
Johannes Berg 已提交
3734 3735
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    sband->vht_cap.vht_supported) {
3736
		const u8 *vht_oper_ie, *vht_cap;
J
Johannes Berg 已提交
3737

3738 3739
		vht_oper_ie = ieee80211_bss_get_ie(cbss,
						   WLAN_EID_VHT_OPERATION);
J
Johannes Berg 已提交
3740 3741 3742 3743
		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
3744
			sdata_info(sdata,
J
Johannes Berg 已提交
3745
				   "AP advertised VHT without HT, disabling both\n");
3746 3747
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3748
		}
3749 3750 3751 3752 3753 3754

		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;
		}
3755 3756
	}

J
Johannes Berg 已提交
3757 3758 3759
	ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
						     cbss->channel,
						     ht_oper, vht_oper,
3760
						     &chandef, true);
3761

J
Johannes Berg 已提交
3762 3763
	sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
				      local->rx_chains);
3764

3765 3766
	rcu_read_unlock();

3767 3768 3769
	/* will change later if needed */
	sdata->smps_mode = IEEE80211_SMPS_OFF;

J
Johannes Berg 已提交
3770 3771 3772 3773 3774 3775 3776
	/*
	 * 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);
3777
	while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
J
Johannes Berg 已提交
3778
		ifmgd->flags |= chandef_downgrade(&chandef);
3779 3780 3781
		ret = ieee80211_vif_use_channel(sdata, &chandef,
						IEEE80211_CHANCTX_SHARED);
	}
J
Johannes Berg 已提交
3782
	return ret;
3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809
}

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
3810
	if (new_sta) {
3811 3812 3813
		u32 rates = 0, basic_rates = 0;
		bool have_higher_than_11mbit;
		int min_rate = INT_MAX, min_rate_index = -1;
3814
		struct ieee80211_supported_band *sband;
J
Johannes Berg 已提交
3815
		const struct cfg80211_bss_ies *ies;
3816 3817 3818 3819 3820 3821 3822 3823

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

		err = ieee80211_prep_channel(sdata, cbss);
		if (err) {
			sta_info_free(local, new_sta);
			return err;
		}
3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839

		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
3840 3841
			sdata_info(sdata,
				   "No basic rates, using min rate instead\n");
3842 3843 3844
			basic_rates = BIT(min_rate_index);
		}

J
Johannes Berg 已提交
3845
		new_sta->sta.supp_rates[cbss->channel->band] = rates;
3846 3847 3848
		sdata->vif.bss_conf.basic_rates = basic_rates;

		/* cf. IEEE 802.11 9.2.12 */
J
Johannes Berg 已提交
3849
		if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3850 3851 3852 3853 3854 3855 3856
		    have_higher_than_11mbit)
			sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
		else
			sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

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

3857 3858
		/* set timing information */
		sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
J
Johannes Berg 已提交
3859
		rcu_read_lock();
3860 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
		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
3886
		rcu_read_unlock();
3887 3888

		/* tell driver about BSSID, basic rates and timing */
3889
		ieee80211_bss_info_change_notify(sdata,
3890 3891
			BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
			BSS_CHANGED_BEACON_INT);
3892 3893

		if (assoc)
J
Johannes Berg 已提交
3894
			sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3895

J
Johannes Berg 已提交
3896 3897
		err = sta_info_insert(new_sta);
		new_sta = NULL;
3898
		if (err) {
J
Johannes Berg 已提交
3899 3900 3901
			sdata_info(sdata,
				   "failed to insert STA entry for the AP (error %d)\n",
				   err);
3902 3903 3904
			return err;
		}
	} else
3905
		WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3906 3907 3908 3909

	return 0;
}

3910 3911 3912
/* config hooks */
int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
		       struct cfg80211_auth_request *req)
J
Johannes Berg 已提交
3913
{
J
Johannes Berg 已提交
3914 3915 3916
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data;
3917
	u16 auth_alg;
J
Johannes Berg 已提交
3918 3919 3920
	int err;

	/* prepare auth data structure */
J
Johannes Berg 已提交
3921

3922 3923 3924 3925 3926
	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
3927
		if (IS_ERR(local->wep_tx_tfm))
3928
			return -EOPNOTSUPP;
3929 3930 3931 3932 3933 3934 3935 3936
		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;
3937 3938 3939
	case NL80211_AUTHTYPE_SAE:
		auth_alg = WLAN_AUTH_SAE;
		break;
3940 3941
	default:
		return -EOPNOTSUPP;
J
Johannes Berg 已提交
3942
	}
3943

3944 3945
	auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
			    req->ie_len, GFP_KERNEL);
J
Johannes Berg 已提交
3946
	if (!auth_data)
J
Johannes Berg 已提交
3947
		return -ENOMEM;
3948

J
Johannes Berg 已提交
3949
	auth_data->bss = req->bss;
3950

3951 3952 3953 3954 3955 3956 3957 3958 3959
	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;
	}

3960
	if (req->ie && req->ie_len) {
3961 3962 3963
		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
3964
	}
3965

J
Johannes Berg 已提交
3966
	if (req->key && req->key_len) {
J
Johannes Berg 已提交
3967 3968 3969
		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
3970 3971
	}

J
Johannes Berg 已提交
3972
	auth_data->algorithm = auth_alg;
J
Johannes Berg 已提交
3973

J
Johannes Berg 已提交
3974
	/* try to authenticate/probe */
3975

J
Johannes Berg 已提交
3976 3977 3978 3979
	if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
	    ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
3980 3981
	}

J
Johannes Berg 已提交
3982 3983
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
3984

J
Johannes Berg 已提交
3985 3986
	/* prep auth_data so we don't go into idle on disassoc */
	ifmgd->auth_data = auth_data;
J
Johannes Berg 已提交
3987

3988 3989 3990 3991 3992 3993 3994
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

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

3995 3996
		cfg80211_send_deauth(sdata->dev, frame_buf,
				     sizeof(frame_buf));
3997
	}
J
Johannes Berg 已提交
3998

J
Johannes Berg 已提交
3999
	sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4000

4001 4002
	err = ieee80211_prep_connection(sdata, req->bss, false);
	if (err)
J
Johannes Berg 已提交
4003
		goto err_clear;
J
Johannes Berg 已提交
4004

J
Johannes Berg 已提交
4005 4006 4007 4008 4009 4010 4011
	err = ieee80211_probe_auth(sdata);
	if (err) {
		sta_info_destroy_addr(sdata, req->bss->bssid);
		goto err_clear;
	}

	/* hold our own reference */
4012
	cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4013
	return 0;
J
Johannes Berg 已提交
4014 4015

 err_clear:
4016 4017
	memset(ifmgd->bssid, 0, ETH_ALEN);
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4018 4019 4020 4021
	ifmgd->auth_data = NULL;
 err_free:
	kfree(auth_data);
	return err;
J
Johannes Berg 已提交
4022 4023
}

4024 4025
int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
			struct cfg80211_assoc_request *req)
4026
{
J
Johannes Berg 已提交
4027
	struct ieee80211_local *local = sdata->local;
4028
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4029
	struct ieee80211_bss *bss = (void *)req->bss->priv;
J
Johannes Berg 已提交
4030
	struct ieee80211_mgd_assoc_data *assoc_data;
4031
	const struct cfg80211_bss_ies *beacon_ies;
J
Johannes Berg 已提交
4032
	struct ieee80211_supported_band *sband;
4033
	const u8 *ssidie, *ht_ie, *vht_ie;
4034
	int i, err;
4035

J
Johannes Berg 已提交
4036 4037 4038 4039
	assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
	if (!assoc_data)
		return -ENOMEM;

4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050
	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();

4051 4052 4053 4054 4055 4056 4057
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

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

4058 4059
		cfg80211_send_deauth(sdata->dev, frame_buf,
				     sizeof(frame_buf));
4060
	}
J
Johannes Berg 已提交
4061 4062 4063 4064

	if (ifmgd->auth_data && !ifmgd->auth_data->done) {
		err = -EBUSY;
		goto err_free;
J
Johannes Berg 已提交
4065
	}
4066

J
Johannes Berg 已提交
4067 4068 4069 4070
	if (ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
	}
4071

J
Johannes Berg 已提交
4072 4073 4074 4075
	if (ifmgd->auth_data) {
		bool match;

		/* keep sta info, bssid if matching */
4076
		match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
J
Johannes Berg 已提交
4077
		ieee80211_destroy_auth_data(sdata, match);
4078 4079
	}

J
Johannes Berg 已提交
4080
	/* prepare assoc data */
4081
	
4082 4083
	ifmgd->beacon_crc_valid = false;

J
Johannes Berg 已提交
4084 4085 4086 4087 4088 4089 4090
	/*
	 * 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.
	 */
4091
	for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4092 4093
		if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4094
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4095
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4096
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4097
			netdev_info(sdata->dev,
4098
				    "disabling HT/VHT due to WEP/TKIP use\n");
4099 4100
		}
	}
4101

4102
	if (req->flags & ASSOC_REQ_DISABLE_HT) {
4103
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4104 4105
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
	}
B
Ben Greear 已提交
4106

4107 4108 4109
	if (req->flags & ASSOC_REQ_DISABLE_VHT)
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;

J
Johannes Berg 已提交
4110 4111 4112
	/* 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 ||
4113
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
4114
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4115 4116 4117
		if (!bss->wmm_used)
			netdev_info(sdata->dev,
				    "disabling HT as WMM/QoS is not supported by the AP\n");
4118
	}
J
Johannes Berg 已提交
4119

4120 4121 4122 4123
	/* 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;
4124 4125 4126
		if (!bss->wmm_used)
			netdev_info(sdata->dev,
				    "disabling VHT as WMM/QoS is not supported by the AP\n");
4127 4128
	}

B
Ben Greear 已提交
4129 4130 4131 4132
	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));

4133 4134 4135 4136
	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));

4137
	if (req->ie && req->ie_len) {
J
Johannes Berg 已提交
4138 4139 4140
		memcpy(assoc_data->ie, req->ie, req->ie_len);
		assoc_data->ie_len = req->ie_len;
	}
4141

J
Johannes Berg 已提交
4142
	assoc_data->bss = req->bss;
4143

J
Johannes Berg 已提交
4144 4145
	if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
		if (ifmgd->powersave)
4146
			sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
J
Johannes Berg 已提交
4147
		else
4148
			sdata->smps_mode = IEEE80211_SMPS_OFF;
J
Johannes Berg 已提交
4149
	} else
4150
		sdata->smps_mode = ifmgd->req_smps;
J
Johannes Berg 已提交
4151

J
Johannes Berg 已提交
4152
	assoc_data->capability = req->bss->capability;
J
Johannes Berg 已提交
4153 4154
	assoc_data->wmm = bss->wmm_used &&
			  (local->hw.queues >= IEEE80211_NUM_ACS);
J
Johannes Berg 已提交
4155 4156
	assoc_data->supp_rates = bss->supp_rates;
	assoc_data->supp_rates_len = bss->supp_rates_len;
4157

4158
	rcu_read_lock();
4159 4160 4161 4162 4163
	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
4164
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4165 4166 4167 4168 4169 4170
	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;
4171
	rcu_read_unlock();
4172

K
Kalle Valo 已提交
4173
	if (bss->wmm_used && bss->uapsd_supported &&
4174 4175
	    (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) &&
	    sdata->wmm_acm != 0xff) {
4176
		assoc_data->uapsd = true;
K
Kalle Valo 已提交
4177 4178
		ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
	} else {
4179
		assoc_data->uapsd = false;
K
Kalle Valo 已提交
4180 4181 4182
		ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
	}

4183
	if (req->prev_bssid)
J
Johannes Berg 已提交
4184
		memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198

	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;

4199 4200 4201
	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
4202 4203 4204
	/* kick off associate process */

	ifmgd->assoc_data = assoc_data;
4205
	ifmgd->dtim_period = 0;
J
Johannes Berg 已提交
4206

4207 4208 4209
	err = ieee80211_prep_connection(sdata, req->bss, true);
	if (err)
		goto err_clear;
J
Johannes Berg 已提交
4210

4211 4212
	rcu_read_lock();
	beacon_ies = rcu_dereference(req->bss->beacon_ies);
4213

4214 4215 4216 4217 4218 4219 4220 4221 4222
	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);
4223
		assoc_data->timeout_started = true;
4224 4225 4226 4227 4228
		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);
4229 4230
		u8 dtim_count = 0;

4231 4232 4233 4234
		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;
4235
			dtim_count = tim->dtim_count;
4236
		}
J
Johannes Berg 已提交
4237 4238
		assoc_data->have_beacon = true;
		assoc_data->timeout = jiffies;
4239
		assoc_data->timeout_started = true;
4240 4241 4242 4243 4244 4245 4246

		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;
		}
4247 4248
	} else {
		assoc_data->timeout = jiffies;
4249
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
4250
	}
4251 4252
	rcu_read_unlock();

4253
	run_again(sdata, assoc_data->timeout);
J
Johannes Berg 已提交
4254

P
Paul Stewart 已提交
4255 4256 4257 4258 4259 4260 4261 4262 4263 4264
	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
4265 4266
		sdata_info(sdata, "associating with AP with corrupt %s\n",
			   corrupt_type);
P
Paul Stewart 已提交
4267 4268
	}

4269
	return 0;
J
Johannes Berg 已提交
4270
 err_clear:
4271 4272
	memset(ifmgd->bssid, 0, ETH_ALEN);
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4273 4274 4275 4276
	ifmgd->assoc_data = NULL;
 err_free:
	kfree(assoc_data);
	return err;
4277 4278
}

4279
int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4280
			 struct cfg80211_deauth_request *req)
4281
{
4282
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4283
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4284
	bool tx = !req->local_state_change;
4285
	bool report_frame = false;
4286

J
Johannes Berg 已提交
4287 4288 4289
	sdata_info(sdata,
		   "deauthenticating from %pM by local choice (reason=%d)\n",
		   req->bssid, req->reason_code);
4290

4291
	if (ifmgd->auth_data) {
4292
		drv_mgd_prepare_tx(sdata->local, sdata);
4293 4294
		ieee80211_send_deauth_disassoc(sdata, req->bssid,
					       IEEE80211_STYPE_DEAUTH,
4295
					       req->reason_code, tx,
4296
					       frame_buf);
4297 4298
		ieee80211_destroy_auth_data(sdata, false);

4299
		report_frame = true;
4300
		goto out;
4301 4302
	}

4303 4304 4305 4306
	if (ifmgd->associated &&
	    ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       req->reason_code, tx, frame_buf);
4307
		report_frame = true;
4308
	}
4309

4310
 out:
4311
	if (report_frame)
4312 4313
		cfg80211_send_deauth(sdata->dev, frame_buf,
				     IEEE80211_DEAUTH_FRAME_LEN);
4314

4315 4316
	return 0;
}
4317

4318
int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4319
			   struct cfg80211_disassoc_request *req)
J
Johannes Berg 已提交
4320
{
4321
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4322
	u8 bssid[ETH_ALEN];
4323
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
J
Johannes Berg 已提交
4324

J
Johannes Berg 已提交
4325 4326 4327 4328 4329 4330
	/*
	 * 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.
	 */
4331
	if (ifmgd->associated != req->bss)
4332 4333
		return -ENOLINK;

J
Johannes Berg 已提交
4334 4335 4336
	sdata_info(sdata,
		   "disassociating from %pM by local choice (reason=%d)\n",
		   req->bss->bssid, req->reason_code);
4337

4338
	memcpy(bssid, req->bss->bssid, ETH_ALEN);
4339 4340 4341
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
			       req->reason_code, !req->local_state_change,
			       frame_buf);
4342

4343 4344
	cfg80211_send_disassoc(sdata->dev, frame_buf,
			       IEEE80211_DEAUTH_FRAME_LEN);
4345

4346 4347
	return 0;
}
4348

4349
void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4350 4351 4352
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363
	/*
	 * 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);

4364
	sdata_lock(sdata);
4365 4366 4367 4368 4369
	if (ifmgd->assoc_data)
		ieee80211_destroy_assoc_data(sdata, false);
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
	del_timer_sync(&ifmgd->timer);
4370
	sdata_unlock(sdata);
4371 4372
}

4373 4374 4375 4376 4377 4378
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);

J
Johannes Berg 已提交
4379 4380
	trace_api_cqm_rssi_notify(sdata, rssi_event);

4381 4382 4383
	cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
}
EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);