mlme.c 122.0 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
	if (!mgd->have_beacon)
1364 1365
		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.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_BEACON_INFO;
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
	sdata->vif.bss_conf.dtim_period = 0;
1906
	ifmgd->have_beacon = false;
1907

1908 1909
	ifmgd->flags = 0;
	ieee80211_vif_release_channel(sdata);
1910
}
1911

1912 1913 1914 1915 1916 1917 1918 1919
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
1920 1921
	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
1922
	 */
J
Johannes Berg 已提交
1923 1924 1925
	if (is_multicast_ether_addr(hdr->addr1))
		return;

1926
	ieee80211_sta_reset_conn_monitor(sdata);
1927
}
1928

1929 1930 1931
static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1932
	struct ieee80211_local *local = sdata->local;
1933

1934
	mutex_lock(&local->mtx);
1935
	if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1936 1937 1938 1939
			      IEEE80211_STA_CONNECTION_POLL))) {
		mutex_unlock(&local->mtx);
		return;
	}
1940

1941
	__ieee80211_stop_poll(sdata);
1942 1943 1944 1945

	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
	mutex_unlock(&local->iflist_mtx);
1946 1947

	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1948
		goto out;
1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959

	/*
	 * 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));
1960 1961
out:
	mutex_unlock(&local->mtx);
1962 1963 1964
}

void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1965
			     struct ieee80211_hdr *hdr, bool ack)
1966
{
F
Felix Fietkau 已提交
1967
	if (!ieee80211_is_data(hdr->frame_control))
1968 1969 1970 1971
	    return;

	if (ieee80211_is_nullfunc(hdr->frame_control) &&
	    sdata->u.mgd.probe_send_count > 0) {
1972
		if (ack)
1973
			ieee80211_sta_reset_conn_monitor(sdata);
1974 1975
		else
			sdata->u.mgd.nullfunc_failed = true;
1976
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1977
		return;
1978
	}
1979 1980 1981

	if (ack)
		ieee80211_sta_reset_conn_monitor(sdata);
1982 1983
}

1984 1985 1986 1987
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ssid;
1988
	u8 *dst = ifmgd->associated->bssid;
1989
	u8 unicast_limit = max(1, max_probe_tries - 3);
1990 1991 1992 1993 1994 1995 1996 1997

	/*
	 * 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;
1998

1999 2000 2001 2002 2003 2004 2005
	/*
	 * 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.
	 */
2006 2007
	ifmgd->probe_send_count++;

2008 2009
	if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
		ifmgd->nullfunc_failed = false;
2010
		ieee80211_send_nullfunc(sdata->local, sdata, 0);
2011
	} else {
2012 2013
		int ssid_len;

2014
		rcu_read_lock();
2015
		ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2016 2017 2018 2019 2020 2021
		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,
2022
					 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
2023
					 ifmgd->associated->channel, false);
2024
		rcu_read_unlock();
2025
	}
2026

2027
	ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2028
	run_again(sdata, ifmgd->probe_timeout);
2029
	if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2030
		ieee80211_flush_queues(sdata->local, sdata);
2031 2032
}

J
Johannes Berg 已提交
2033 2034
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
				   bool beacon)
2035 2036
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
2037
	bool already = false;
2038

2039
	if (!ieee80211_sdata_running(sdata))
2040 2041
		return;

2042
	sdata_lock(sdata);
2043 2044 2045 2046

	if (!ifmgd->associated)
		goto out;

2047 2048 2049 2050 2051 2052 2053
	mutex_lock(&sdata->local->mtx);

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

2054
	if (beacon) {
J
Johannes Berg 已提交
2055
		mlme_dbg_ratelimited(sdata,
2056 2057
				     "detected beacon loss from AP (missed %d beacons) - probing\n",
				     beacon_loss_count);
J
Johannes Berg 已提交
2058

2059 2060 2061 2062
		ieee80211_cqm_rssi_notify(&sdata->vif,
					  NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
					  GFP_KERNEL);
	}
2063

J
Johannes Berg 已提交
2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083
	/*
	 * 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;

2084 2085
	mutex_unlock(&sdata->local->mtx);

J
Johannes Berg 已提交
2086 2087 2088
	if (already)
		goto out;

2089 2090 2091 2092
	mutex_lock(&sdata->local->iflist_mtx);
	ieee80211_recalc_ps(sdata->local, -1);
	mutex_unlock(&sdata->local->iflist_mtx);

2093 2094
	ifmgd->probe_send_count = 0;
	ieee80211_mgd_probe_ap_send(sdata);
2095
 out:
2096
	sdata_unlock(sdata);
2097 2098
}

2099 2100 2101 2102 2103
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;
2104
	struct cfg80211_bss *cbss;
2105 2106
	struct sk_buff *skb;
	const u8 *ssid;
2107
	int ssid_len;
2108 2109 2110 2111

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

2112
	sdata_assert_lock(sdata);
2113

2114 2115 2116 2117 2118 2119 2120
	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
2121 2122
		return NULL;

2123
	rcu_read_lock();
2124
	ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2125 2126 2127 2128 2129
	if (WARN_ON_ONCE(ssid == NULL))
		ssid_len = 0;
	else
		ssid_len = ssid[1];

2130
	skb = ieee80211_build_probe_req(sdata, cbss->bssid,
J
Johannes Berg 已提交
2131
					(u32) -1, cbss->channel,
2132
					ssid + 2, ssid_len,
2133
					NULL, 0, true);
2134
	rcu_read_unlock();
2135 2136 2137 2138 2139

	return skb;
}
EXPORT_SYMBOL(ieee80211_ap_probereq_get);

2140
static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2141 2142
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2143
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2144

2145
	sdata_lock(sdata);
2146
	if (!ifmgd->associated) {
2147
		sdata_unlock(sdata);
2148 2149 2150
		return;
	}

2151 2152
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
			       WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2153
			       true, frame_buf);
2154
	ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
2155
	ieee80211_wake_queues_by_reason(&sdata->local->hw,
2156
					IEEE80211_MAX_QUEUE_MAP,
2157
					IEEE80211_QUEUE_STOP_REASON_CSA);
2158

2159 2160
	cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
			      IEEE80211_DEAUTH_FRAME_LEN);
2161
	sdata_unlock(sdata);
2162 2163
}

2164
static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
J
Johannes Berg 已提交
2165 2166 2167
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
2168
			     u.mgd.beacon_connection_loss_work);
2169 2170 2171 2172
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct sta_info *sta;

	if (ifmgd->associated) {
2173
		rcu_read_lock();
2174 2175 2176
		sta = sta_info_get(sdata, ifmgd->bssid);
		if (sta)
			sta->beacon_loss_count++;
2177
		rcu_read_unlock();
2178
	}
J
Johannes Berg 已提交
2179

2180
	if (ifmgd->connection_loss) {
2181 2182
		sdata_info(sdata, "Connection to AP %pM lost\n",
			   ifmgd->bssid);
2183
		__ieee80211_disconnect(sdata);
2184
	} else {
2185
		ieee80211_mgd_probe_ap(sdata, true);
2186 2187 2188 2189 2190 2191 2192 2193 2194
	}
}

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);

2195
	__ieee80211_disconnect(sdata);
J
Johannes Berg 已提交
2196 2197
}

2198 2199 2200
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2201
	struct ieee80211_hw *hw = &sdata->local->hw;
2202

J
Johannes Berg 已提交
2203 2204
	trace_api_beacon_loss(sdata);

2205
	sdata->u.mgd.connection_loss = false;
2206
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2207 2208 2209
}
EXPORT_SYMBOL(ieee80211_beacon_loss);

2210 2211 2212 2213 2214
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
2215 2216
	trace_api_connection_loss(sdata);

2217
	sdata->u.mgd.connection_loss = true;
2218 2219 2220 2221 2222
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_connection_loss);


J
Johannes Berg 已提交
2223 2224 2225 2226 2227
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;

2228
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2229 2230 2231 2232 2233 2234

	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);
2235
		sdata->u.mgd.flags = 0;
J
Johannes Berg 已提交
2236
		ieee80211_vif_release_channel(sdata);
J
Johannes Berg 已提交
2237 2238
	}

2239
	cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
J
Johannes Berg 已提交
2240 2241 2242 2243 2244 2245 2246
	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)
{
2247
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
2248 2249 2250
	struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
	u8 *pos;
	struct ieee802_11_elems elems;
2251
	u32 tx_flags = 0;
J
Johannes Berg 已提交
2252 2253

	pos = mgmt->u.auth.variable;
2254
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2255 2256 2257
	if (!elems.challenge)
		return;
	auth_data->expected_transaction = 4;
J
Johannes Berg 已提交
2258
	drv_mgd_prepare_tx(sdata->local, sdata);
2259 2260 2261
	if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
		tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
			   IEEE80211_TX_INTFL_MLME_CONN_TX;
2262
	ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
J
Johannes Berg 已提交
2263 2264 2265
			    elems.challenge - 2, elems.challenge_len + 2,
			    auth_data->bss->bssid, auth_data->bss->bssid,
			    auth_data->key, auth_data->key_len,
2266
			    auth_data->key_idx, tx_flags);
J
Johannes Berg 已提交
2267 2268
}

2269 2270
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
2271 2272 2273 2274 2275 2276
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u8 bssid[ETH_ALEN];
	u16 auth_alg, auth_transaction, status_code;
	struct sta_info *sta;

2277
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2278 2279

	if (len < 24 + 6)
2280
		return;
J
Johannes Berg 已提交
2281 2282

	if (!ifmgd->auth_data || ifmgd->auth_data->done)
2283
		return;
J
Johannes Berg 已提交
2284 2285 2286

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

2287
	if (!ether_addr_equal(bssid, mgmt->bssid))
2288
		return;
J
Johannes Berg 已提交
2289 2290 2291 2292 2293 2294

	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 ||
2295 2296 2297 2298 2299
	    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);
2300
		return;
2301
	}
J
Johannes Berg 已提交
2302 2303

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
2304 2305
		sdata_info(sdata, "%pM denied authentication (status %d)\n",
			   mgmt->sa, status_code);
2306
		ieee80211_destroy_auth_data(sdata, false);
2307
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2308
		return;
J
Johannes Berg 已提交
2309 2310 2311 2312 2313 2314
	}

	switch (ifmgd->auth_data->algorithm) {
	case WLAN_AUTH_OPEN:
	case WLAN_AUTH_LEAP:
	case WLAN_AUTH_FT:
2315
	case WLAN_AUTH_SAE:
J
Johannes Berg 已提交
2316 2317 2318 2319 2320
		break;
	case WLAN_AUTH_SHARED_KEY:
		if (ifmgd->auth_data->expected_transaction != 4) {
			ieee80211_auth_challenge(sdata, mgmt, len);
			/* need another frame */
2321
			return;
J
Johannes Berg 已提交
2322 2323 2324 2325 2326
		}
		break;
	default:
		WARN_ONCE(1, "invalid auth alg %d",
			  ifmgd->auth_data->algorithm);
2327
		return;
J
Johannes Berg 已提交
2328 2329
	}

J
Johannes Berg 已提交
2330
	sdata_info(sdata, "authenticated\n");
J
Johannes Berg 已提交
2331 2332
	ifmgd->auth_data->done = true;
	ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2333
	ifmgd->auth_data->timeout_started = true;
2334
	run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
2335

2336 2337 2338 2339 2340 2341
	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.
		 */
2342
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2343
		return;
2344 2345
	}

J
Johannes Berg 已提交
2346 2347 2348 2349 2350 2351 2352 2353
	/* 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
2354
		sdata_info(sdata, "failed moving %pM to auth\n", bssid);
J
Johannes Berg 已提交
2355 2356 2357 2358
		goto out_err;
	}
	mutex_unlock(&sdata->local->sta_mtx);

2359
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2360
	return;
J
Johannes Berg 已提交
2361 2362 2363 2364 2365 2366
 out_err:
	mutex_unlock(&sdata->local->sta_mtx);
	/* ignore frame -- wait for timeout */
}


2367 2368
static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
2369
{
2370
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2371
	const u8 *bssid = NULL;
2372 2373
	u16 reason_code;

2374
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2375

2376
	if (len < 24 + 2)
2377
		return;
2378

J
Johannes Berg 已提交
2379
	if (!ifmgd->associated ||
2380
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2381
		return;
2382

2383
	bssid = ifmgd->associated->bssid;
2384 2385 2386

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

J
Johannes Berg 已提交
2387 2388
	sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
		   bssid, reason_code);
2389

2390 2391
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2392
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2393 2394 2395
}


2396 2397
static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_mgmt *mgmt, size_t len)
2398
{
2399
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2400 2401
	u16 reason_code;

2402
	sdata_assert_lock(sdata);
2403

J
Johannes Berg 已提交
2404
	if (len < 24 + 2)
2405
		return;
2406

J
Johannes Berg 已提交
2407
	if (!ifmgd->associated ||
2408
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2409
		return;
2410 2411 2412

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

J
Johannes Berg 已提交
2413 2414
	sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
		   mgmt->sa, reason_code);
2415

2416 2417
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2418
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
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 2460 2461
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;
			}
		}
	}
}
2462

J
Johannes Berg 已提交
2463 2464 2465 2466 2467
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;

2468
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2469 2470 2471 2472 2473 2474

	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);
2475
		sdata->u.mgd.flags = 0;
J
Johannes Berg 已提交
2476
		ieee80211_vif_release_channel(sdata);
J
Johannes Berg 已提交
2477 2478 2479 2480 2481 2482 2483 2484
	}

	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
2485
				    struct ieee80211_mgmt *mgmt, size_t len)
2486
{
2487
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2488
	struct ieee80211_local *local = sdata->local;
2489
	struct ieee80211_supported_band *sband;
2490
	struct sta_info *sta;
J
Johannes Berg 已提交
2491 2492
	u8 *pos;
	u16 capab_info, aid;
2493
	struct ieee802_11_elems elems;
J
Johannes Berg 已提交
2494
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
J
Johannes Berg 已提交
2495
	u32 changed = 0;
2496
	int err;
2497

J
Johannes Berg 已提交
2498
	/* AssocResp and ReassocResp have identical structure */
2499 2500

	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
J
Johannes Berg 已提交
2501
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2502

2503
	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
J
Johannes Berg 已提交
2504 2505
		sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
			   aid);
2506 2507
	aid &= ~(BIT(15) | BIT(14));

2508 2509 2510
	ifmgd->broken_ap = false;

	if (aid == 0 || aid > IEEE80211_MAX_AID) {
J
Johannes Berg 已提交
2511 2512
		sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
			   aid);
2513 2514 2515 2516
		aid = 0;
		ifmgd->broken_ap = true;
	}

J
Johannes Berg 已提交
2517
	pos = mgmt->u.assoc_resp.variable;
2518
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2519

2520
	if (!elems.supp_rates) {
J
Johannes Berg 已提交
2521
		sdata_info(sdata, "no SuppRates element in AssocResp\n");
J
Johannes Berg 已提交
2522
		return false;
2523 2524
	}

2525
	ifmgd->aid = aid;
2526

2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544
	/*
	 * 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;
	}

2545 2546 2547 2548 2549
	mutex_lock(&sdata->local->sta_mtx);
	/*
	 * station info was already allocated and inserted before
	 * the association and should be available to us
	 */
2550
	sta = sta_info_get(sdata, cbss->bssid);
2551 2552
	if (WARN_ON(!sta)) {
		mutex_unlock(&sdata->local->sta_mtx);
J
Johannes Berg 已提交
2553
		return false;
2554
	}
2555

J
Johannes Berg 已提交
2556
	sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2557

2558
	/* Set up internal HT/VHT capabilities */
2559
	if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
B
Ben Greear 已提交
2560
		ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2561
						  elems.ht_cap_elem, sta);
2562

M
Mahesh Palivela 已提交
2563 2564
	if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
		ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2565
						    elems.vht_cap_elem, sta);
M
Mahesh Palivela 已提交
2566

2567 2568 2569 2570 2571 2572
	/*
	 * 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.
	 */
2573

2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588
	/*
	 * 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;
	}

2589
	rate_control_rate_init(sta);
2590

2591
	if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
J
Johannes Berg 已提交
2592
		set_sta_flag(sta, WLAN_STA_MFP);
2593

2594
	if (elems.wmm_param)
J
Johannes Berg 已提交
2595
		set_sta_flag(sta, WLAN_STA_WME);
2596

2597
	err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2598 2599 2600
	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
2601 2602 2603
		sdata_info(sdata,
			   "failed to move station %pM to desired state\n",
			   sta->sta.addr);
2604 2605 2606 2607 2608
		WARN_ON(__sta_info_destroy(sta));
		mutex_unlock(&sdata->local->sta_mtx);
		return false;
	}

2609
	mutex_unlock(&sdata->local->sta_mtx);
2610

2611 2612 2613 2614 2615 2616 2617 2618
	/*
	 * 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;

2619
	if (elems.wmm_param)
2620
		ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
J
Johannes Berg 已提交
2621
					 elems.wmm_param_len);
2622
	else
2623 2624
		ieee80211_set_wmm_default(sdata, false);
	changed |= BSS_CHANGED_QOS;
2625

J
Johannes Berg 已提交
2626 2627 2628 2629
	/* set AID and assoc capability,
	 * ieee80211_set_associated() will tell the driver */
	bss_conf->aid = aid;
	bss_conf->assoc_capability = capab_info;
2630
	ieee80211_set_associated(sdata, cbss, changed);
2631

2632 2633 2634 2635 2636 2637 2638
	/*
	 * 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);

2639
	/*
J
Johannes Berg 已提交
2640 2641
	 * Start timer to probe the connection to the AP now.
	 * Also start the timer that will detect beacon loss.
2642
	 */
J
Johannes Berg 已提交
2643
	ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2644
	ieee80211_sta_reset_beacon_monitor(sdata);
2645

J
Johannes Berg 已提交
2646
	return true;
2647 2648
}

2649 2650 2651
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
2652 2653 2654 2655 2656 2657 2658
{
	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;
2659
	struct cfg80211_bss *bss;
J
Johannes Berg 已提交
2660

2661
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2662 2663

	if (!assoc_data)
2664
		return;
2665
	if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2666
		return;
J
Johannes Berg 已提交
2667 2668 2669 2670 2671 2672 2673

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

	if (len < 24 + 6)
2674
		return;
J
Johannes Berg 已提交
2675 2676 2677 2678 2679 2680

	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
2681 2682 2683 2684
	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
2685 2686

	pos = mgmt->u.assoc_resp.variable;
2687
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2688 2689

	if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2690 2691
	    elems.timeout_int &&
	    elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
J
Johannes Berg 已提交
2692
		u32 tu, ms;
2693
		tu = le32_to_cpu(elems.timeout_int->value);
J
Johannes Berg 已提交
2694
		ms = tu * 1024 / 1000;
J
Johannes Berg 已提交
2695 2696 2697
		sdata_info(sdata,
			   "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
			   mgmt->sa, tu, ms);
J
Johannes Berg 已提交
2698
		assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2699
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
2700
		if (ms > IEEE80211_ASSOC_TIMEOUT)
2701 2702
			run_again(sdata, assoc_data->timeout);
		return;
J
Johannes Berg 已提交
2703 2704
	}

2705
	bss = assoc_data->bss;
J
Johannes Berg 已提交
2706 2707

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
2708 2709
		sdata_info(sdata, "%pM denied association (code=%d)\n",
			   mgmt->sa, status_code);
J
Johannes Berg 已提交
2710 2711
		ieee80211_destroy_assoc_data(sdata, false);
	} else {
2712
		if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
J
Johannes Berg 已提交
2713
			/* oops -- internal error -- send timeout for now */
2714
			ieee80211_destroy_assoc_data(sdata, false);
2715
			cfg80211_put_bss(sdata->local->hw.wiphy, bss);
2716
			cfg80211_assoc_timeout(sdata->dev, mgmt->bssid);
2717
			return;
J
Johannes Berg 已提交
2718
		}
2719
		sdata_info(sdata, "associated\n");
2720 2721 2722 2723 2724 2725 2726

		/*
		 * 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
2727 2728
	}

2729
	cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len);
J
Johannes Berg 已提交
2730
}
J
Johannes Berg 已提交
2731

2732
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
2733
				  struct ieee80211_mgmt *mgmt, size_t len,
2734
				  struct ieee80211_rx_status *rx_status,
2735
				  struct ieee802_11_elems *elems)
2736 2737 2738
{
	struct ieee80211_local *local = sdata->local;
	int freq;
2739
	struct ieee80211_bss *bss;
2740
	struct ieee80211_channel *channel;
2741

2742
	sdata_assert_lock(sdata);
2743

2744
	if (elems->ds_params)
2745 2746
		freq = ieee80211_channel_to_frequency(elems->ds_params[0],
						      rx_status->band);
2747 2748 2749 2750 2751 2752 2753 2754 2755
	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,
2756
					channel);
2757 2758 2759
	if (bss)
		ieee80211_rx_bss_put(local, bss);

2760 2761
	if (!sdata->u.mgd.associated ||
	    !ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid))
2762 2763
		return;

2764 2765
	ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
					 elems, true);
2766

2767 2768 2769
}


2770
static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
2771
					 struct sk_buff *skb)
2772
{
J
Johannes Berg 已提交
2773
	struct ieee80211_mgmt *mgmt = (void *)skb->data;
2774
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
2775 2776
	struct ieee80211_rx_status *rx_status = (void *) skb->cb;
	size_t baselen, len = skb->len;
2777 2778
	struct ieee802_11_elems elems;

2779 2780
	ifmgd = &sdata->u.mgd;

2781
	sdata_assert_lock(sdata);
2782

2783
	if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2784 2785
		return; /* ignore ProbeResp to foreign address */

2786 2787 2788 2789 2790
	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
	if (baselen > len)
		return;

	ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2791
			       false, &elems);
2792

2793
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2794

2795
	if (ifmgd->associated &&
2796
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2797
		ieee80211_reset_ap_probe(sdata);
J
Johannes Berg 已提交
2798 2799

	if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2800
	    ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
J
Johannes Berg 已提交
2801
		/* got probe response, continue with auth */
J
Johannes Berg 已提交
2802
		sdata_info(sdata, "direct probe responded\n");
J
Johannes Berg 已提交
2803 2804
		ifmgd->auth_data->tries = 0;
		ifmgd->auth_data->timeout = jiffies;
2805
		ifmgd->auth_data->timeout_started = true;
2806
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
2807
	}
2808 2809
}

2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823
/*
 * 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 =
2824 2825 2826 2827 2828
	(1ULL << WLAN_EID_COUNTRY) |
	(1ULL << WLAN_EID_ERP_INFO) |
	(1ULL << WLAN_EID_CHANNEL_SWITCH) |
	(1ULL << WLAN_EID_PWR_CONSTRAINT) |
	(1ULL << WLAN_EID_HT_CAPABILITY) |
2829
	(1ULL << WLAN_EID_HT_OPERATION);
2830

2831 2832 2833
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)
2834
{
2835
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2836
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2837 2838
	size_t baselen;
	struct ieee802_11_elems elems;
2839
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
2840 2841
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
2842
	struct sta_info *sta;
2843
	u32 changed = 0;
2844
	bool erp_valid;
J
Johannes Berg 已提交
2845
	u8 erp_value = 0;
2846
	u32 ncrc;
2847
	u8 *bssid;
2848
	u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
2849

2850
	sdata_assert_lock(sdata);
2851

2852 2853 2854
	/* Process beacon from the current BSS */
	baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
	if (baselen > len)
2855
		return;
2856

J
Johannes Berg 已提交
2857 2858 2859 2860
	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		rcu_read_unlock();
2861
		return;
J
Johannes Berg 已提交
2862 2863
	}

2864
	if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
J
Johannes Berg 已提交
2865
		rcu_read_unlock();
2866
		return;
J
Johannes Berg 已提交
2867
	}
2868
	chan = chanctx_conf->def.chan;
J
Johannes Berg 已提交
2869
	rcu_read_unlock();
2870

2871
	if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2872
	    ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
J
Johannes Berg 已提交
2873
		ieee802_11_parse_elems(mgmt->u.beacon.variable,
2874
				       len - baselen, false, &elems);
2875

2876
		ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2877 2878 2879 2880
		if (elems.tim && !elems.parse_error) {
			const struct ieee80211_tim_ie *tim_ie = elems.tim;
			ifmgd->dtim_period = tim_ie->dtim_period;
		}
2881
		ifmgd->have_beacon = true;
2882
		ifmgd->assoc_data->need_beacon = false;
2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893
		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
2894 2895
		/* continue assoc process */
		ifmgd->assoc_data->timeout = jiffies;
2896
		ifmgd->assoc_data->timeout_started = true;
2897 2898
		run_again(sdata, ifmgd->assoc_data->timeout);
		return;
J
Johannes Berg 已提交
2899
	}
2900

J
Johannes Berg 已提交
2901
	if (!ifmgd->associated ||
2902
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2903
		return;
J
Johannes Berg 已提交
2904
	bssid = ifmgd->associated->bssid;
2905

2906 2907 2908 2909
	/* 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;
2910
		ifmgd->ave_beacon_signal = rx_status->signal * 16;
2911
		ifmgd->last_cqm_event_signal = 0;
2912
		ifmgd->count_beacon_signal = 1;
2913
		ifmgd->last_ave_beacon_signal = 0;
2914 2915 2916 2917 2918
	} else {
		ifmgd->ave_beacon_signal =
			(IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
			 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
			 ifmgd->ave_beacon_signal) / 16;
2919
		ifmgd->count_beacon_signal++;
2920
	}
2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933

	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;
2934
			drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
2935 2936 2937 2938
		} else if (sig < ifmgd->rssi_min_thold &&
			   (last_sig >= ifmgd->rssi_max_thold ||
			   last_sig == 0)) {
			ifmgd->last_ave_beacon_signal = sig;
2939
			drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
2940 2941 2942
		}
	}

2943
	if (bss_conf->cqm_rssi_thold &&
2944
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2945
	    !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966
		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
2967
	if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
J
Johannes Berg 已提交
2968
		mlme_dbg_ratelimited(sdata,
2969
				     "cancelling AP probe due to a received beacon\n");
2970
		mutex_lock(&local->mtx);
J
Johannes Berg 已提交
2971
		ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2972 2973 2974
		ieee80211_run_deferred_scan(local);
		mutex_unlock(&local->mtx);

2975 2976 2977
		mutex_lock(&local->iflist_mtx);
		ieee80211_recalc_ps(local, -1);
		mutex_unlock(&local->iflist_mtx);
2978 2979
	}

J
Johannes Berg 已提交
2980 2981 2982 2983
	/*
	 * Push the beacon loss detection into the future since
	 * we are processing a beacon from the AP just now.
	 */
2984
	ieee80211_sta_reset_beacon_monitor(sdata);
J
Johannes Berg 已提交
2985

2986 2987
	ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
	ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2988
					  len - baselen, false, &elems,
2989 2990
					  care_about_ies, ncrc);

2991
	if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2992 2993 2994
		bool directed_tim = ieee80211_check_tim(elems.tim,
							elems.tim_len,
							ifmgd->aid);
2995
		if (directed_tim) {
2996
			if (local->hw.conf.dynamic_ps_timeout > 0) {
2997 2998 2999 3000 3001
				if (local->hw.conf.flags & IEEE80211_CONF_PS) {
					local->hw.conf.flags &= ~IEEE80211_CONF_PS;
					ieee80211_hw_config(local,
							    IEEE80211_CONF_CHANGE_PS);
				}
3002
				ieee80211_send_nullfunc(local, sdata, 0);
3003
			} else if (!local->pspolling && sdata->u.mgd.powersave) {
3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015
				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);
			}
3016 3017
		}
	}
J
Johannes Berg 已提交
3018

3019
	if (sdata->vif.p2p) {
J
Janusz Dziedzic 已提交
3020
		struct ieee80211_p2p_noa_attr noa = {};
3021 3022 3023 3024 3025
		int ret;

		ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
					    len - baselen,
					    IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3026
					    (u8 *) &noa, sizeof(noa));
J
Janusz Dziedzic 已提交
3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042
		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));
3043 3044 3045 3046 3047
			changed |= BSS_CHANGED_P2P_PS;
			ifmgd->beacon_crc_valid = false;
		}
	}

3048
	if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3049
		return;
3050
	ifmgd->beacon_crc = ncrc;
3051
	ifmgd->beacon_crc_valid = true;
3052

3053
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3054 3055 3056 3057 3058

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

3059 3060
	/*
	 * If we haven't had a beacon before, tell the driver about the
3061
	 * DTIM period (and beacon timing if desired) now.
3062
	 */
3063
	if (!ifmgd->have_beacon) {
3064 3065 3066 3067 3068
		/* 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;
3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081

		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;
		}

3082 3083
		changed |= BSS_CHANGED_BEACON_INFO;
		ifmgd->have_beacon = true;
3084 3085 3086 3087 3088

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

3089
		ieee80211_recalc_ps_vif(sdata);
3090 3091
	}

3092
	if (elems.erp_info) {
J
Johannes Berg 已提交
3093 3094 3095 3096
		erp_valid = true;
		erp_value = elems.erp_info[0];
	} else {
		erp_valid = false;
3097
	}
J
Johannes Berg 已提交
3098 3099 3100
	changed |= ieee80211_handle_bss_capability(sdata,
			le16_to_cpu(mgmt->u.beacon.capab_info),
			erp_valid, erp_value);
3101

3102
	mutex_lock(&local->sta_mtx);
3103 3104
	sta = sta_info_get(sdata, bssid);

3105 3106 3107 3108 3109 3110
	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);
3111 3112
		cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
				      sizeof(deauth_buf));
3113
		return;
3114
	}
3115 3116 3117 3118

	if (sta && elems.opmode_notif)
		ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
					    rx_status->band, true);
3119
	mutex_unlock(&local->sta_mtx);
3120

3121 3122 3123
	if (elems.country_elem && elems.pwr_constr_elem &&
	    mgmt->u.probe_resp.capab_info &
				cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
3124 3125 3126 3127
		changed |= ieee80211_handle_pwr_constr(sdata, chan,
						       elems.country_elem,
						       elems.country_elem_len,
						       elems.pwr_constr_elem);
3128

3129
	ieee80211_bss_info_change_notify(sdata, changed);
3130 3131
}

3132 3133
void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
				  struct sk_buff *skb)
3134 3135 3136 3137
{
	struct ieee80211_rx_status *rx_status;
	struct ieee80211_mgmt *mgmt;
	u16 fc;
3138 3139
	struct ieee802_11_elems elems;
	int ies_len;
3140 3141 3142 3143 3144

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

3145
	sdata_lock(sdata);
3146

J
Johannes Berg 已提交
3147 3148
	switch (fc & IEEE80211_FCTL_STYPE) {
	case IEEE80211_STYPE_BEACON:
3149
		ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
J
Johannes Berg 已提交
3150 3151 3152 3153 3154
		break;
	case IEEE80211_STYPE_PROBE_RESP:
		ieee80211_rx_mgmt_probe_resp(sdata, skb);
		break;
	case IEEE80211_STYPE_AUTH:
3155
		ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3156 3157
		break;
	case IEEE80211_STYPE_DEAUTH:
3158
		ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3159 3160
		break;
	case IEEE80211_STYPE_DISASSOC:
3161
		ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3162 3163 3164
		break;
	case IEEE80211_STYPE_ASSOC_RESP:
	case IEEE80211_STYPE_REASSOC_RESP:
3165
		ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3166 3167
		break;
	case IEEE80211_STYPE_ACTION:
3168
		if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3169 3170 3171
			ies_len = skb->len -
				  offsetof(struct ieee80211_mgmt,
					   u.action.u.chan_switch.variable);
3172 3173 3174 3175 3176 3177

			if (ies_len < 0)
				break;

			ieee802_11_parse_elems(
				mgmt->u.action.u.chan_switch.variable,
3178
				ies_len, true, &elems);
3179 3180 3181 3182

			if (elems.parse_error)
				break;

3183 3184
			ieee80211_sta_process_chanswitch(sdata,
							 rx_status->mactime,
3185
							 &elems, false);
3186 3187 3188 3189 3190 3191 3192 3193 3194 3195
		} 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,
3196
				ies_len, true, &elems);
3197 3198 3199 3200 3201 3202 3203 3204

			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
3205
			ieee80211_sta_process_chanswitch(sdata,
3206
							 rx_status->mactime,
3207
							 &elems, false);
3208
		}
3209
		break;
3210
	}
3211
	sdata_unlock(sdata);
3212 3213
}

J
Johannes Berg 已提交
3214
static void ieee80211_sta_timer(unsigned long data)
3215
{
J
Johannes Berg 已提交
3216 3217
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
3218

3219
	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3220 3221
}

3222
static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3223
					  u8 *bssid, u8 reason, bool tx)
3224
{
3225
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3226

3227
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3228
			       tx, frame_buf);
3229

3230 3231
	cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
			      IEEE80211_DEAUTH_FRAME_LEN);
3232 3233
}

J
Johannes Berg 已提交
3234 3235 3236 3237 3238
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;
3239
	u32 tx_flags = 0;
J
Johannes Berg 已提交
3240

3241
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3242 3243 3244 3245 3246 3247 3248

	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
3249 3250
		sdata_info(sdata, "authentication with %pM timed out\n",
			   auth_data->bss->bssid);
J
Johannes Berg 已提交
3251 3252 3253 3254 3255 3256 3257 3258 3259 3260

		/*
		 * 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
3261 3262
	drv_mgd_prepare_tx(local, sdata);

J
Johannes Berg 已提交
3263
	if (auth_data->bss->proberesp_ies) {
3264 3265 3266
		u16 trans = 1;
		u16 status = 0;

J
Johannes Berg 已提交
3267 3268 3269
		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
3270 3271

		auth_data->expected_transaction = 2;
3272 3273 3274 3275 3276 3277 3278

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

3279 3280 3281 3282
		if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
			tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
				   IEEE80211_TX_INTFL_MLME_CONN_TX;

3283 3284
		ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
				    auth_data->data, auth_data->data_len,
J
Johannes Berg 已提交
3285
				    auth_data->bss->bssid,
3286 3287
				    auth_data->bss->bssid, NULL, 0, 0,
				    tx_flags);
J
Johannes Berg 已提交
3288 3289 3290
	} else {
		const u8 *ssidie;

J
Johannes Berg 已提交
3291 3292 3293
		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
3294

3295
		rcu_read_lock();
J
Johannes Berg 已提交
3296
		ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3297 3298
		if (!ssidie) {
			rcu_read_unlock();
J
Johannes Berg 已提交
3299
			return -EINVAL;
3300
		}
J
Johannes Berg 已提交
3301 3302 3303 3304 3305
		/*
		 * 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],
3306
					 NULL, 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
3307
					 auth_data->bss->channel, false);
3308
		rcu_read_unlock();
J
Johannes Berg 已提交
3309 3310
	}

3311
	if (tx_flags == 0) {
3312
		auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3313
		ifmgd->auth_data->timeout_started = true;
3314
		run_again(sdata, auth_data->timeout);
3315 3316
	} else {
		auth_data->timeout_started = false;
3317
	}
J
Johannes Berg 已提交
3318 3319 3320 3321 3322 3323 3324 3325 3326

	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;

3327
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3328 3329 3330

	assoc_data->tries++;
	if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
J
Johannes Berg 已提交
3331 3332
		sdata_info(sdata, "association with %pM timed out\n",
			   assoc_data->bss->bssid);
J
Johannes Berg 已提交
3333 3334 3335 3336 3337 3338 3339 3340 3341 3342

		/*
		 * 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
3343 3344 3345
	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
3346 3347
	ieee80211_send_assoc(sdata);

3348 3349
	if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
		assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3350
		assoc_data->timeout_started = true;
3351
		run_again(sdata, assoc_data->timeout);
3352 3353
	} else {
		assoc_data->timeout_started = false;
3354
	}
J
Johannes Berg 已提交
3355 3356 3357 3358

	return 0;
}

3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370
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);
}

3371
void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
3372 3373
{
	struct ieee80211_local *local = sdata->local;
3374
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3375

3376
	sdata_lock(sdata);
3377

3378 3379 3380 3381 3382 3383 3384 3385 3386 3387
	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;
3388
				run_again(sdata, ifmgd->auth_data->timeout);
3389 3390 3391
			} else {
				ifmgd->auth_data->timeout = jiffies - 1;
			}
3392
			ifmgd->auth_data->timeout_started = true;
3393 3394 3395 3396 3397 3398
		} 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;
3399
				run_again(sdata, ifmgd->assoc_data->timeout);
3400 3401 3402
			} else {
				ifmgd->assoc_data->timeout = jiffies - 1;
			}
3403
			ifmgd->assoc_data->timeout_started = true;
3404 3405 3406
		}
	}

3407
	if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
J
Johannes Berg 已提交
3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421
	    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);

3422
			cfg80211_auth_timeout(sdata->dev, bssid);
J
Johannes Berg 已提交
3423
		}
3424
	} else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3425
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
3426

3427
	if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
J
Johannes Berg 已提交
3428
	    time_after(jiffies, ifmgd->assoc_data->timeout)) {
3429
		if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
J
Johannes Berg 已提交
3430 3431 3432 3433 3434 3435 3436
		    ieee80211_do_assoc(sdata)) {
			u8 bssid[ETH_ALEN];

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

			ieee80211_destroy_assoc_data(sdata, false);

3437
			cfg80211_assoc_timeout(sdata->dev, bssid);
J
Johannes Berg 已提交
3438
		}
3439
	} else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3440
		run_again(sdata, ifmgd->assoc_data->timeout);
J
Johannes Berg 已提交
3441

J
Johannes Berg 已提交
3442 3443 3444
	if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
			    IEEE80211_STA_CONNECTION_POLL) &&
	    ifmgd->associated) {
3445
		u8 bssid[ETH_ALEN];
3446
		int max_tries;
3447

3448
		memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3449

3450
		if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3451
			max_tries = max_nullfunc_tries;
3452
		else
3453
			max_tries = max_probe_tries;
3454

3455 3456 3457
		/* ACK received for nullfunc probing frame */
		if (!ifmgd->probe_send_count)
			ieee80211_reset_ap_probe(sdata);
3458 3459
		else if (ifmgd->nullfunc_failed) {
			if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3460 3461 3462 3463
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
					 bssid, ifmgd->probe_send_count,
					 max_tries);
3464 3465
				ieee80211_mgd_probe_ap_send(sdata);
			} else {
J
Johannes Berg 已提交
3466 3467 3468
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
					 bssid);
3469
				ieee80211_sta_connection_lost(sdata, bssid,
3470 3471
					WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
					false);
3472 3473
			}
		} else if (time_is_after_jiffies(ifmgd->probe_timeout))
3474
			run_again(sdata, ifmgd->probe_timeout);
3475
		else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
J
Johannes Berg 已提交
3476 3477 3478
			mlme_dbg(sdata,
				 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
				 bssid, probe_wait_ms);
3479
			ieee80211_sta_connection_lost(sdata, bssid,
3480
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3481
		} else if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3482 3483 3484 3485
			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);
3486 3487
			ieee80211_mgd_probe_ap_send(sdata);
		} else {
J
Johannes Berg 已提交
3488 3489 3490 3491
			/*
			 * We actually lost the connection ... or did we?
			 * Let's make sure!
			 */
3492 3493 3494 3495
			wiphy_debug(local->hw.wiphy,
				    "%s: No probe response from AP %pM"
				    " after %dms, disconnecting.\n",
				    sdata->name,
3496
				    bssid, probe_wait_ms);
3497

3498
			ieee80211_sta_connection_lost(sdata, bssid,
3499
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
J
Johannes Berg 已提交
3500 3501 3502
		}
	}

3503
	sdata_unlock(sdata);
3504 3505
}

J
Johannes Berg 已提交
3506 3507 3508 3509 3510 3511 3512 3513 3514
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;

3515
	sdata->u.mgd.connection_loss = false;
3516 3517
	ieee80211_queue_work(&sdata->local->hw,
			     &sdata->u.mgd.beacon_connection_loss_work);
J
Johannes Berg 已提交
3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529
}

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;

3530
	ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
J
Johannes Berg 已提交
3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541
}

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
3542 3543
static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
3544 3545
	u32 flags;

3546
	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3547
		__ieee80211_stop_poll(sdata);
3548

J
Johannes Berg 已提交
3549
		/* let's probe the connection once */
3550 3551 3552 3553
		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
3554
		/* and do all the other regular work too */
J
Johannes Berg 已提交
3555
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3556
	}
J
Johannes Berg 已提交
3557
}
3558

3559 3560 3561 3562 3563
#ifdef CONFIG_PM
void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

3564
	sdata_lock(sdata);
3565
	if (!ifmgd->associated) {
3566
		sdata_unlock(sdata);
3567 3568 3569 3570 3571 3572 3573 3574 3575 3576
		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);
3577
		sdata_unlock(sdata);
3578 3579
		return;
	}
3580
	sdata_unlock(sdata);
3581 3582 3583
}
#endif

J
Johannes Berg 已提交
3584 3585
/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3586
{
3587
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
3588

3589
	ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3590
	INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3591
	INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3592 3593
	INIT_WORK(&ifmgd->beacon_connection_loss_work,
		  ieee80211_beacon_connection_loss_work);
3594 3595
	INIT_WORK(&ifmgd->csa_connection_drop_work,
		  ieee80211_csa_connection_drop_work);
3596
	INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3597
	setup_timer(&ifmgd->timer, ieee80211_sta_timer,
S
Sujith 已提交
3598
		    (unsigned long) sdata);
J
Johannes Berg 已提交
3599 3600 3601 3602
	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);
3603
	setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
J
Johannes Berg 已提交
3604 3605
		    (unsigned long) sdata);

3606
	ifmgd->flags = 0;
3607
	ifmgd->powersave = sdata->wdev.ps;
3608 3609
	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
3610
	ifmgd->p2p_noa_index = -1;
J
Johannes Berg 已提交
3611

3612 3613 3614 3615
	if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
		ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
	else
		ifmgd->req_smps = IEEE80211_SMPS_OFF;
3616 3617
}

3618 3619
/* scan finished notification */
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
J
Johannes Berg 已提交
3620
{
3621
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
3622

3623 3624
	/* Restart STA timers */
	rcu_read_lock();
3625 3626 3627 3628
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (ieee80211_sdata_running(sdata))
			ieee80211_restart_sta_timer(sdata);
	}
3629 3630
	rcu_read_unlock();
}
J
Johannes Berg 已提交
3631

3632 3633 3634 3635 3636 3637 3638
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);
3639

3640 3641 3642
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, latency_usec);
	mutex_unlock(&local->iflist_mtx);
3643

3644
	return 0;
J
Johannes Berg 已提交
3645 3646
}

J
Johannes Berg 已提交
3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658
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;

3659
	ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
J
Johannes Berg 已提交
3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671
	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;

3672
	vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
J
Johannes Berg 已提交
3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690
	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;
}

3691 3692
static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
				  struct cfg80211_bss *cbss)
3693 3694 3695
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3696
	const struct ieee80211_ht_operation *ht_oper = NULL;
J
Johannes Berg 已提交
3697
	const struct ieee80211_vht_operation *vht_oper = NULL;
3698
	struct ieee80211_supported_band *sband;
3699
	struct cfg80211_chan_def chandef;
J
Johannes Berg 已提交
3700
	int ret;
3701

3702 3703
	sband = local->hw.wiphy->bands[cbss->channel->band];

J
Johannes Berg 已提交
3704 3705 3706 3707
	ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
			  IEEE80211_STA_DISABLE_80P80MHZ |
			  IEEE80211_STA_DISABLE_160MHZ);

3708 3709
	rcu_read_lock();

J
Johannes Berg 已提交
3710 3711
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	    sband->ht_cap.ht_supported) {
3712
		const u8 *ht_oper_ie, *ht_cap;
3713

3714
		ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3715 3716
		if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
			ht_oper = (void *)(ht_oper_ie + 2);
3717 3718 3719 3720 3721 3722

		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;
		}
3723 3724
	}

J
Johannes Berg 已提交
3725 3726
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    sband->vht_cap.vht_supported) {
3727
		const u8 *vht_oper_ie, *vht_cap;
J
Johannes Berg 已提交
3728

3729 3730
		vht_oper_ie = ieee80211_bss_get_ie(cbss,
						   WLAN_EID_VHT_OPERATION);
J
Johannes Berg 已提交
3731 3732 3733 3734
		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
3735
			sdata_info(sdata,
J
Johannes Berg 已提交
3736
				   "AP advertised VHT without HT, disabling both\n");
3737 3738
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3739
		}
3740 3741 3742 3743 3744 3745

		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;
		}
3746 3747
	}

J
Johannes Berg 已提交
3748 3749 3750
	ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
						     cbss->channel,
						     ht_oper, vht_oper,
3751
						     &chandef, true);
3752

J
Johannes Berg 已提交
3753 3754
	sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
				      local->rx_chains);
3755

3756 3757
	rcu_read_unlock();

3758 3759 3760
	/* will change later if needed */
	sdata->smps_mode = IEEE80211_SMPS_OFF;

J
Johannes Berg 已提交
3761 3762 3763 3764 3765 3766 3767
	/*
	 * 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);
3768
	while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
J
Johannes Berg 已提交
3769
		ifmgd->flags |= chandef_downgrade(&chandef);
3770 3771 3772
		ret = ieee80211_vif_use_channel(sdata, &chandef,
						IEEE80211_CHANCTX_SHARED);
	}
J
Johannes Berg 已提交
3773
	return ret;
3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800
}

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
3801
	if (new_sta) {
3802 3803 3804
		u32 rates = 0, basic_rates = 0;
		bool have_higher_than_11mbit;
		int min_rate = INT_MAX, min_rate_index = -1;
3805
		struct ieee80211_supported_band *sband;
J
Johannes Berg 已提交
3806
		const struct cfg80211_bss_ies *ies;
3807 3808 3809 3810 3811 3812 3813 3814

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

		err = ieee80211_prep_channel(sdata, cbss);
		if (err) {
			sta_info_free(local, new_sta);
			return err;
		}
3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830

		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
3831 3832
			sdata_info(sdata,
				   "No basic rates, using min rate instead\n");
3833 3834 3835
			basic_rates = BIT(min_rate_index);
		}

J
Johannes Berg 已提交
3836
		new_sta->sta.supp_rates[cbss->channel->band] = rates;
3837 3838 3839
		sdata->vif.bss_conf.basic_rates = basic_rates;

		/* cf. IEEE 802.11 9.2.12 */
J
Johannes Berg 已提交
3840
		if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3841 3842 3843 3844 3845 3846 3847
		    have_higher_than_11mbit)
			sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
		else
			sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

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

3848 3849
		/* set timing information */
		sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
J
Johannes Berg 已提交
3850
		rcu_read_lock();
3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876
		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
3877
		rcu_read_unlock();
3878 3879

		/* tell driver about BSSID, basic rates and timing */
3880
		ieee80211_bss_info_change_notify(sdata,
3881 3882
			BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
			BSS_CHANGED_BEACON_INT);
3883 3884

		if (assoc)
J
Johannes Berg 已提交
3885
			sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3886

J
Johannes Berg 已提交
3887 3888
		err = sta_info_insert(new_sta);
		new_sta = NULL;
3889
		if (err) {
J
Johannes Berg 已提交
3890 3891 3892
			sdata_info(sdata,
				   "failed to insert STA entry for the AP (error %d)\n",
				   err);
3893 3894 3895
			return err;
		}
	} else
3896
		WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3897 3898 3899 3900

	return 0;
}

3901 3902 3903
/* config hooks */
int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
		       struct cfg80211_auth_request *req)
J
Johannes Berg 已提交
3904
{
J
Johannes Berg 已提交
3905 3906 3907
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data;
3908
	u16 auth_alg;
J
Johannes Berg 已提交
3909 3910 3911
	int err;

	/* prepare auth data structure */
J
Johannes Berg 已提交
3912

3913 3914 3915 3916 3917
	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
3918
		if (IS_ERR(local->wep_tx_tfm))
3919
			return -EOPNOTSUPP;
3920 3921 3922 3923 3924 3925 3926 3927
		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;
3928 3929 3930
	case NL80211_AUTHTYPE_SAE:
		auth_alg = WLAN_AUTH_SAE;
		break;
3931 3932
	default:
		return -EOPNOTSUPP;
J
Johannes Berg 已提交
3933
	}
3934

3935 3936
	auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
			    req->ie_len, GFP_KERNEL);
J
Johannes Berg 已提交
3937
	if (!auth_data)
J
Johannes Berg 已提交
3938
		return -ENOMEM;
3939

J
Johannes Berg 已提交
3940
	auth_data->bss = req->bss;
3941

3942 3943 3944 3945 3946 3947 3948 3949 3950
	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;
	}

3951
	if (req->ie && req->ie_len) {
3952 3953 3954
		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
3955
	}
3956

J
Johannes Berg 已提交
3957
	if (req->key && req->key_len) {
J
Johannes Berg 已提交
3958 3959 3960
		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
3961 3962
	}

J
Johannes Berg 已提交
3963
	auth_data->algorithm = auth_alg;
J
Johannes Berg 已提交
3964

J
Johannes Berg 已提交
3965
	/* try to authenticate/probe */
3966

J
Johannes Berg 已提交
3967 3968 3969 3970
	if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
	    ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
3971 3972
	}

J
Johannes Berg 已提交
3973 3974
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
3975

J
Johannes Berg 已提交
3976 3977
	/* prep auth_data so we don't go into idle on disassoc */
	ifmgd->auth_data = auth_data;
J
Johannes Berg 已提交
3978

3979 3980 3981 3982 3983 3984 3985
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

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

3986 3987
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      sizeof(frame_buf));
3988
	}
J
Johannes Berg 已提交
3989

J
Johannes Berg 已提交
3990
	sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3991

3992 3993
	err = ieee80211_prep_connection(sdata, req->bss, false);
	if (err)
J
Johannes Berg 已提交
3994
		goto err_clear;
J
Johannes Berg 已提交
3995

J
Johannes Berg 已提交
3996 3997 3998 3999 4000 4001 4002
	err = ieee80211_probe_auth(sdata);
	if (err) {
		sta_info_destroy_addr(sdata, req->bss->bssid);
		goto err_clear;
	}

	/* hold our own reference */
4003
	cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4004
	return 0;
J
Johannes Berg 已提交
4005 4006

 err_clear:
4007 4008
	memset(ifmgd->bssid, 0, ETH_ALEN);
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4009 4010 4011 4012
	ifmgd->auth_data = NULL;
 err_free:
	kfree(auth_data);
	return err;
J
Johannes Berg 已提交
4013 4014
}

4015 4016
int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
			struct cfg80211_assoc_request *req)
4017
{
J
Johannes Berg 已提交
4018
	struct ieee80211_local *local = sdata->local;
4019
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4020
	struct ieee80211_bss *bss = (void *)req->bss->priv;
J
Johannes Berg 已提交
4021
	struct ieee80211_mgd_assoc_data *assoc_data;
4022
	const struct cfg80211_bss_ies *beacon_ies;
J
Johannes Berg 已提交
4023
	struct ieee80211_supported_band *sband;
4024
	const u8 *ssidie, *ht_ie, *vht_ie;
4025
	int i, err;
4026

J
Johannes Berg 已提交
4027 4028 4029 4030
	assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
	if (!assoc_data)
		return -ENOMEM;

4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041
	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();

4042 4043 4044 4045 4046 4047 4048
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

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

4049 4050
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      sizeof(frame_buf));
4051
	}
J
Johannes Berg 已提交
4052 4053 4054 4055

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

J
Johannes Berg 已提交
4058 4059 4060 4061
	if (ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
	}
4062

J
Johannes Berg 已提交
4063 4064 4065 4066
	if (ifmgd->auth_data) {
		bool match;

		/* keep sta info, bssid if matching */
4067
		match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
J
Johannes Berg 已提交
4068
		ieee80211_destroy_auth_data(sdata, match);
4069 4070
	}

J
Johannes Berg 已提交
4071
	/* prepare assoc data */
4072
	
4073 4074
	ifmgd->beacon_crc_valid = false;

J
Johannes Berg 已提交
4075 4076 4077 4078 4079 4080 4081
	/*
	 * 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.
	 */
4082
	for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4083 4084
		if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4085
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4086
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4087
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4088
			netdev_info(sdata->dev,
4089
				    "disabling HT/VHT due to WEP/TKIP use\n");
4090 4091
		}
	}
4092

4093
	if (req->flags & ASSOC_REQ_DISABLE_HT) {
4094
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4095 4096
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
	}
B
Ben Greear 已提交
4097

4098 4099 4100
	if (req->flags & ASSOC_REQ_DISABLE_VHT)
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;

J
Johannes Berg 已提交
4101 4102 4103
	/* 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 ||
4104
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
4105
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4106 4107 4108
		if (!bss->wmm_used)
			netdev_info(sdata->dev,
				    "disabling HT as WMM/QoS is not supported by the AP\n");
4109
	}
J
Johannes Berg 已提交
4110

4111 4112 4113 4114
	/* 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;
4115 4116 4117
		if (!bss->wmm_used)
			netdev_info(sdata->dev,
				    "disabling VHT as WMM/QoS is not supported by the AP\n");
4118 4119
	}

B
Ben Greear 已提交
4120 4121 4122 4123
	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));

4124 4125 4126 4127
	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));

4128
	if (req->ie && req->ie_len) {
J
Johannes Berg 已提交
4129 4130 4131
		memcpy(assoc_data->ie, req->ie, req->ie_len);
		assoc_data->ie_len = req->ie_len;
	}
4132

J
Johannes Berg 已提交
4133
	assoc_data->bss = req->bss;
4134

J
Johannes Berg 已提交
4135 4136
	if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
		if (ifmgd->powersave)
4137
			sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
J
Johannes Berg 已提交
4138
		else
4139
			sdata->smps_mode = IEEE80211_SMPS_OFF;
J
Johannes Berg 已提交
4140
	} else
4141
		sdata->smps_mode = ifmgd->req_smps;
J
Johannes Berg 已提交
4142

J
Johannes Berg 已提交
4143
	assoc_data->capability = req->bss->capability;
J
Johannes Berg 已提交
4144 4145
	assoc_data->wmm = bss->wmm_used &&
			  (local->hw.queues >= IEEE80211_NUM_ACS);
J
Johannes Berg 已提交
4146 4147
	assoc_data->supp_rates = bss->supp_rates;
	assoc_data->supp_rates_len = bss->supp_rates_len;
4148

4149
	rcu_read_lock();
4150 4151 4152 4153 4154
	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
4155
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4156 4157 4158 4159 4160 4161
	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;
4162
	rcu_read_unlock();
4163

K
Kalle Valo 已提交
4164
	if (bss->wmm_used && bss->uapsd_supported &&
4165 4166
	    (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) &&
	    sdata->wmm_acm != 0xff) {
4167
		assoc_data->uapsd = true;
K
Kalle Valo 已提交
4168 4169
		ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
	} else {
4170
		assoc_data->uapsd = false;
K
Kalle Valo 已提交
4171 4172 4173
		ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
	}

4174
	if (req->prev_bssid)
J
Johannes Berg 已提交
4175
		memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189

	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;

4190 4191 4192
	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
4193 4194 4195
	/* kick off associate process */

	ifmgd->assoc_data = assoc_data;
4196
	ifmgd->dtim_period = 0;
4197
	ifmgd->have_beacon = false;
J
Johannes Berg 已提交
4198

4199 4200 4201
	err = ieee80211_prep_connection(sdata, req->bss, true);
	if (err)
		goto err_clear;
J
Johannes Berg 已提交
4202

4203 4204
	rcu_read_lock();
	beacon_ies = rcu_dereference(req->bss->beacon_ies);
4205

4206 4207 4208 4209 4210 4211 4212 4213 4214
	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);
4215
		assoc_data->timeout_started = true;
4216 4217 4218 4219 4220
		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);
4221 4222
		u8 dtim_count = 0;

4223 4224 4225 4226
		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;
4227
			dtim_count = tim->dtim_count;
4228
		}
4229
		ifmgd->have_beacon = true;
J
Johannes Berg 已提交
4230
		assoc_data->timeout = jiffies;
4231
		assoc_data->timeout_started = true;
4232 4233 4234 4235 4236 4237 4238

		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;
		}
4239 4240
	} else {
		assoc_data->timeout = jiffies;
4241
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
4242
	}
4243 4244
	rcu_read_unlock();

4245
	run_again(sdata, assoc_data->timeout);
J
Johannes Berg 已提交
4246

P
Paul Stewart 已提交
4247 4248 4249 4250 4251 4252 4253 4254 4255 4256
	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
4257 4258
		sdata_info(sdata, "associating with AP with corrupt %s\n",
			   corrupt_type);
P
Paul Stewart 已提交
4259 4260
	}

4261
	return 0;
J
Johannes Berg 已提交
4262
 err_clear:
4263 4264
	memset(ifmgd->bssid, 0, ETH_ALEN);
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4265 4266 4267 4268
	ifmgd->assoc_data = NULL;
 err_free:
	kfree(assoc_data);
	return err;
4269 4270
}

4271
int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4272
			 struct cfg80211_deauth_request *req)
4273
{
4274
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4275
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4276
	bool tx = !req->local_state_change;
4277
	bool report_frame = false;
4278

J
Johannes Berg 已提交
4279 4280 4281
	sdata_info(sdata,
		   "deauthenticating from %pM by local choice (reason=%d)\n",
		   req->bssid, req->reason_code);
4282

4283
	if (ifmgd->auth_data) {
4284
		drv_mgd_prepare_tx(sdata->local, sdata);
4285 4286
		ieee80211_send_deauth_disassoc(sdata, req->bssid,
					       IEEE80211_STYPE_DEAUTH,
4287
					       req->reason_code, tx,
4288
					       frame_buf);
4289 4290
		ieee80211_destroy_auth_data(sdata, false);

4291
		report_frame = true;
4292
		goto out;
4293 4294
	}

4295 4296 4297 4298
	if (ifmgd->associated &&
	    ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       req->reason_code, tx, frame_buf);
4299
		report_frame = true;
4300
	}
4301

4302
 out:
4303
	if (report_frame)
4304 4305
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
4306

4307 4308
	return 0;
}
4309

4310
int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4311
			   struct cfg80211_disassoc_request *req)
J
Johannes Berg 已提交
4312
{
4313
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4314
	u8 bssid[ETH_ALEN];
4315
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
J
Johannes Berg 已提交
4316

J
Johannes Berg 已提交
4317 4318 4319 4320 4321 4322
	/*
	 * 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.
	 */
4323
	if (ifmgd->associated != req->bss)
4324 4325
		return -ENOLINK;

J
Johannes Berg 已提交
4326 4327 4328
	sdata_info(sdata,
		   "disassociating from %pM by local choice (reason=%d)\n",
		   req->bss->bssid, req->reason_code);
4329

4330
	memcpy(bssid, req->bss->bssid, ETH_ALEN);
4331 4332 4333
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
			       req->reason_code, !req->local_state_change,
			       frame_buf);
4334

4335 4336
	cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
			      IEEE80211_DEAUTH_FRAME_LEN);
4337

4338 4339
	return 0;
}
4340

4341
void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4342 4343 4344
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355
	/*
	 * 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);

4356
	sdata_lock(sdata);
4357 4358 4359 4360 4361
	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);
4362
	sdata_unlock(sdata);
4363 4364
}

4365 4366 4367 4368 4369 4370
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
4371 4372
	trace_api_cqm_rssi_notify(sdata, rssi_event);

4373 4374 4375
	cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
}
EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);