mlme.c 137.3 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>
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 * Copyright 2013-2014  Intel Mobile Communications GmbH
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 *
 * 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)
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#define IEEE80211_AUTH_TIMEOUT_LONG	(HZ / 2)
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#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)
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#define IEEE80211_ASSOC_TIMEOUT_LONG	(HZ / 2)
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#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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	ifmgd->probe_send_count = 0;

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

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

	chandef->width = NL80211_CHAN_WIDTH_20;

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

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	ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
						  channel->band);
	/* check that channel matches the right operating channel */
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	if (!tracking && channel->center_freq != ht_cfreq) {
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		/*
		 * 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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		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;
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		vht_chandef.center_freq1 = chandef->center_freq1;
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		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 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
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			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 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
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			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 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
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			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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	/*
	 * When tracking the current AP, don't do any further checks if the
	 * new chandef is identical to the one we're currently using for the
	 * connection. This keeps us from playing ping-pong with regulatory,
	 * without it the following can happen (for example):
	 *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
	 *  - AP advertises regdom US
	 *  - CRDA loads regdom US with 80 MHz prohibited (old database)
	 *  - the code below detects an unsupported channel, downgrades, and
	 *    we disconnect from the AP in the caller
	 *  - disconnect causes CRDA to reload world regdomain and the game
	 *    starts anew.
	 * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
	 *
	 * It seems possible that there are still scenarios with CSA or real
	 * bandwidth changes where a this could happen, but those cases are
	 * less common and wouldn't completely prevent using the AP.
	 */
	if (tracking &&
	    cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
		return ret;

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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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	/*
	 * Ignore the DISABLED flag when we're already connected and only
	 * tracking the APs beacon for bandwidth changes - otherwise we
	 * might get disconnected here if we connect to an AP, update our
	 * regulatory information based on the AP's country IE and the
	 * information we have is wrong/outdated and disables the channel
	 * that we're actually using for the connection to the AP.
	 */
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	while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
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					tracking ? 0 :
						   IEEE80211_CHAN_DISABLED)) {
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		if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
			ret = IEEE80211_STA_DISABLE_HT |
			      IEEE80211_STA_DISABLE_VHT;
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			break;
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		}

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		ret |= ieee80211_chandef_downgrade(chandef);
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	}

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	if (chandef->width != vht_chandef.width && !tracking)
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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,
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			       const struct ieee80211_ht_cap *ht_cap,
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			       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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	/*
	 * if bss configuration changed store the new one -
	 * this may be applicable even if channel is identical
	 */
	ht_opmode = le16_to_cpu(ht_oper->operation_mode);
	if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
		*changed |= BSS_CHANGED_HT;
		sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
	}

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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 */
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	flags = ieee80211_determine_chantype(sdata, sband, chan,
					     ht_cap, ht_oper, vht_oper,
					     &chandef, true);
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	/*
	 * 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)
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		flags |= ieee80211_chandef_downgrade(&chandef);
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	if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
	    chandef.width == NL80211_CHAN_WIDTH_160)
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		flags |= ieee80211_chandef_downgrade(&chandef);
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	if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
	    chandef.width > NL80211_CHAN_WIDTH_20)
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		flags |= ieee80211_chandef_downgrade(&chandef);
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	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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	return 0;
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}

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/* frame sending functions */

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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)
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{
	u8 *pos;
	u32 cap;
	struct ieee80211_sta_vht_cap vht_cap;
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	u32 mask, ap_bf_sts, our_bf_sts;
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	BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));

	memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
549
	ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
550 551 552 553

	/* 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;
	}

564 565 566 567 568 569 570 571
	/*
	 * 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;

572 573 574 575 576 577 578 579 580 581
	mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;

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

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

582
	/* reserve and fill IE */
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	pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
584 585 586
	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;
596
	int i, count, rates_len, supp_rates_len, shift;
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	u16 capab;
	struct ieee80211_supported_band *sband;
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	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
601
	u32 rate_flags, rates = 0;
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603
	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;
	}
611
	chan = chanctx_conf->def.chan;
612
	rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
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	rcu_read_unlock();
	sband = local->hw.wiphy->bands[chan->band];
615
	shift = ieee80211_vif_get_shift(&sdata->vif);
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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)...
		 */
624 625 626 627
		rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
						     assoc_data->supp_rates,
						     assoc_data->supp_rates_len,
						     &rates);
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	} else {
		/*
		 * In case AP not provide any supported rates information
		 * before association, we send information element(s) with
		 * all rates that we support.
		 */
634 635 636 637 638 639 640 641
		rates_len = 0;
		for (i = 0; i < sband->n_bitrates; i++) {
			if ((rate_flags & sband->bitrates[i].flags)
			    != rate_flags)
				continue;
			rates |= BIT(i);
			rates_len++;
		}
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	}

	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;

676 677 678
	if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
		capab |= WLAN_CAPABILITY_RADIO_MEASURE;

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	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) {
721 722 723
			int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
						5 * (1 << shift));
			*pos++ = (u8) rate;
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			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) {
736 737 738 739
				int rate;
				rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
						    5 * (1 << shift));
				*pos++ = (u8) rate;
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			}
		}
	}

744 745
	if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
	    capab & WLAN_CAPABILITY_RADIO_MEASURE) {
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		pos = skb_put(skb, 4);
		*pos++ = WLAN_EID_PWR_CAPABILITY;
		*pos++ = 2;
		*pos++ = 0; /* min tx power */
750 751
		 /* max tx power */
		*pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
752
	}
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754
	if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
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		/* 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 */
767
	if (assoc_data->ie_len) {
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		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,
778 779
			WLAN_EID_FAST_BSS_TRANSITION,	/* reassoc only */
			WLAN_EID_RIC_DATA,		/* reassoc only */
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			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
		};
782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801
		static const u8 after_ric[] = {
			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
			WLAN_EID_HT_CAPABILITY,
			WLAN_EID_BSS_COEX_2040,
			WLAN_EID_EXT_CAPABILITY,
			WLAN_EID_QOS_TRAFFIC_CAPA,
			WLAN_EID_TIM_BCAST_REQ,
			WLAN_EID_INTERWORKING,
			/* 60GHz doesn't happen right now */
			WLAN_EID_VHT_CAPABILITY,
			WLAN_EID_OPMODE_NOTIF,
		};

		noffset = ieee80211_ie_split_ric(assoc_data->ie,
						 assoc_data->ie_len,
						 before_ht,
						 ARRAY_SIZE(before_ht),
						 after_ric,
						 ARRAY_SIZE(after_ric),
						 offset);
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		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;

811
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
812
		ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
813
				    sband, chan, sdata->smps_mode);
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815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834
	/* if present, add any custom IEs that go before VHT */
	if (assoc_data->ie_len) {
		static const u8 before_vht[] = {
			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,
			WLAN_EID_HT_CAPABILITY,
			WLAN_EID_BSS_COEX_2040,
			WLAN_EID_EXT_CAPABILITY,
			WLAN_EID_QOS_TRAFFIC_CAPA,
			WLAN_EID_TIM_BCAST_REQ,
			WLAN_EID_INTERWORKING,
		};
835 836

		/* RIC already taken above, so no need to handle here anymore */
837 838 839 840 841 842 843 844
		noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
					     before_vht, ARRAY_SIZE(before_vht),
					     offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
		offset = noffset;
	}

845
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
846 847
		ieee80211_add_vht_ie(sdata, skb, sband,
				     &assoc_data->ap_vht_cap);
848

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	/* if present, add any custom non-vendor IEs that go after HT */
850
	if (assoc_data->ie_len) {
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		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;
	}

859 860
	if (assoc_data->wmm) {
		if (assoc_data->uapsd) {
861 862
			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;
		}

868
		pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
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	}

	/* add any remaining custom (i.e. vendor specific here) IEs */
872
	if (assoc_data->ie_len) {
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		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;
881 882 883
	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);
}

887 888 889 890 891 892
void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_pspoll *pspoll;
	struct sk_buff *skb;

893 894
	skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
	if (!skb)
895 896
		return;

897 898
	pspoll = (struct ieee80211_pspoll *) skb->data;
	pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
899

900 901
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
902 903
}

904 905 906 907 908
void ieee80211_send_nullfunc(struct ieee80211_local *local,
			     struct ieee80211_sub_if_data *sdata,
			     int powersave)
{
	struct sk_buff *skb;
909
	struct ieee80211_hdr_3addr *nullfunc;
910
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
911

912 913
	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
	if (!skb)
914 915
		return;

916
	nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
917
	if (powersave)
918
		nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
919

920 921
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
					IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
922 923 924 925

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

926
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
927 928
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;

929
	ieee80211_tx_skb(sdata, skb);
930 931
}

932 933 934 935 936 937 938 939 940 941 942
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);
943
	if (!skb)
944
		return;
945

946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961
	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);
}

962 963 964 965 966
/* 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);
967
	struct ieee80211_local *local = sdata->local;
968
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
969
	int ret;
970

971
	if (!ieee80211_sdata_running(sdata))
972 973
		return;

974
	sdata_lock(sdata);
975 976 977
	mutex_lock(&local->mtx);
	mutex_lock(&local->chanctx_mtx);

978 979
	if (!ifmgd->associated)
		goto out;
980

981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014
	if (!sdata->vif.csa_active)
		goto out;

	/*
	 * using reservation isn't immediate as it may be deferred until later
	 * with multi-vif. once reservation is complete it will re-schedule the
	 * work with no reserved_chanctx so verify chandef to check if it
	 * completed successfully
	 */

	if (sdata->reserved_chanctx) {
		/*
		 * with multi-vif csa driver may call ieee80211_csa_finish()
		 * many times while waiting for other interfaces to use their
		 * reservations
		 */
		if (sdata->reserved_ready)
			goto out;

		ret = ieee80211_vif_use_reserved_context(sdata);
		if (ret) {
			sdata_info(sdata,
				   "failed to use reserved channel context, disconnecting (err=%d)\n",
				   ret);
			ieee80211_queue_work(&sdata->local->hw,
					     &ifmgd->csa_connection_drop_work);
			goto out;
		}

		goto out;
	}

	if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
					&sdata->csa_chandef)) {
1015
		sdata_info(sdata,
1016
			   "failed to finalize channel switch, disconnecting\n");
1017 1018 1019 1020
		ieee80211_queue_work(&sdata->local->hw,
				     &ifmgd->csa_connection_drop_work);
		goto out;
	}
1021

1022
	/* XXX: shouldn't really modify cfg80211-owned data! */
1023
	ifmgd->associated->channel = sdata->csa_chandef.chan;
1024

1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044
	ifmgd->csa_waiting_bcn = true;

	ieee80211_sta_reset_beacon_monitor(sdata);
	ieee80211_sta_reset_conn_monitor(sdata);

out:
	mutex_unlock(&local->chanctx_mtx);
	mutex_unlock(&local->mtx);
	sdata_unlock(sdata);
}

static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	int ret;

	sdata_assert_lock(sdata);

	WARN_ON(!sdata->vif.csa_active);
1045

1046 1047 1048 1049 1050
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
1051

1052 1053 1054
	sdata->vif.csa_active = false;
	ifmgd->csa_waiting_bcn = false;

1055 1056 1057 1058 1059 1060
	ret = drv_post_channel_switch(sdata);
	if (ret) {
		sdata_info(sdata,
			   "driver post channel switch failed, disconnecting\n");
		ieee80211_queue_work(&local->hw,
				     &ifmgd->csa_connection_drop_work);
1061
		return;
1062
	}
1063 1064
}

1065 1066
void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
{
J
Johannes Berg 已提交
1067 1068
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1069 1070 1071

	trace_api_chswitch_done(sdata, success);
	if (!success) {
1072 1073 1074 1075 1076 1077
		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);
1078 1079 1080 1081
	}
}
EXPORT_SYMBOL(ieee80211_chswitch_done);

1082 1083 1084 1085
static void ieee80211_chswitch_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
1086

1087
	ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1088 1089
}

1090
static void
J
Johannes Berg 已提交
1091
ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1092 1093
				 u64 timestamp, u32 device_timestamp,
				 struct ieee802_11_elems *elems,
1094
				 bool beacon)
1095
{
1096
	struct ieee80211_local *local = sdata->local;
1097
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1098
	struct cfg80211_bss *cbss = ifmgd->associated;
1099
	struct ieee80211_chanctx_conf *conf;
J
Johannes Berg 已提交
1100
	struct ieee80211_chanctx *chanctx;
1101
	enum ieee80211_band current_band;
1102
	struct ieee80211_csa_ie csa_ie;
1103
	struct ieee80211_channel_switch ch_switch;
1104
	int res;
1105

1106
	sdata_assert_lock(sdata);
1107

1108
	if (!cbss)
1109 1110
		return;

1111
	if (local->scanning)
1112 1113
		return;

1114
	/* disregard subsequent announcements if we are already processing */
1115
	if (sdata->vif.csa_active)
1116 1117
		return;

1118
	current_band = cbss->channel->band;
1119
	memset(&csa_ie, 0, sizeof(csa_ie));
1120 1121
	res = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, current_band,
					   ifmgd->flags,
1122
					   ifmgd->associated->bssid, &csa_ie);
1123
	if (res	< 0)
1124
		ieee80211_queue_work(&local->hw,
1125
				     &ifmgd->csa_connection_drop_work);
1126
	if (res)
1127
		return;
1128

1129
	if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1130 1131 1132
				     IEEE80211_CHAN_DISABLED)) {
		sdata_info(sdata,
			   "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1133
			   ifmgd->associated->bssid,
1134 1135 1136
			   csa_ie.chandef.chan->center_freq,
			   csa_ie.chandef.width, csa_ie.chandef.center_freq1,
			   csa_ie.chandef.center_freq2);
1137 1138 1139 1140 1141
		ieee80211_queue_work(&local->hw,
				     &ifmgd->csa_connection_drop_work);
		return;
	}

1142
	mutex_lock(&local->mtx);
1143
	mutex_lock(&local->chanctx_mtx);
1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157
	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
					 lockdep_is_held(&local->chanctx_mtx));
	if (!conf) {
		sdata_info(sdata,
			   "no channel context assigned to vif?, disconnecting\n");
		ieee80211_queue_work(&local->hw,
				     &ifmgd->csa_connection_drop_work);
		mutex_unlock(&local->chanctx_mtx);
		mutex_unlock(&local->mtx);
		return;
	}

	chanctx = container_of(conf, struct ieee80211_chanctx, conf);

1158 1159 1160 1161 1162 1163 1164 1165 1166
	if (local->use_chanctx &&
	    !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
		sdata_info(sdata,
			   "driver doesn't support chan-switch with channel contexts\n");
		ieee80211_queue_work(&local->hw,
				     &ifmgd->csa_connection_drop_work);
		mutex_unlock(&local->chanctx_mtx);
		mutex_unlock(&local->mtx);
		return;
J
Johannes Berg 已提交
1167 1168
	}

1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184
	ch_switch.timestamp = timestamp;
	ch_switch.device_timestamp = device_timestamp;
	ch_switch.block_tx = csa_ie.mode;
	ch_switch.chandef = csa_ie.chandef;
	ch_switch.count = csa_ie.count;

	if (drv_pre_channel_switch(sdata, &ch_switch)) {
		sdata_info(sdata,
			   "preparing for channel switch failed, disconnecting\n");
		ieee80211_queue_work(&local->hw,
				     &ifmgd->csa_connection_drop_work);
		mutex_unlock(&local->chanctx_mtx);
		mutex_unlock(&local->mtx);
		return;
	}

1185 1186 1187
	res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
					    chanctx->mode, false);
	if (res) {
J
Johannes Berg 已提交
1188
		sdata_info(sdata,
1189 1190
			   "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
			   res);
1191
		ieee80211_queue_work(&local->hw,
J
Johannes Berg 已提交
1192
				     &ifmgd->csa_connection_drop_work);
1193
		mutex_unlock(&local->chanctx_mtx);
1194
		mutex_unlock(&local->mtx);
J
Johannes Berg 已提交
1195 1196
		return;
	}
1197
	mutex_unlock(&local->chanctx_mtx);
J
Johannes Berg 已提交
1198

1199
	sdata->vif.csa_active = true;
1200
	sdata->csa_chandef = csa_ie.chandef;
1201
	sdata->csa_block_tx = csa_ie.mode;
J
Johannes Berg 已提交
1202

1203
	if (sdata->csa_block_tx)
1204 1205
		ieee80211_stop_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
1206
	mutex_unlock(&local->mtx);
1207

1208
	if (local->ops->channel_switch) {
1209
		/* use driver's channel switch callback */
1210
		drv_channel_switch(local, sdata, &ch_switch);
1211 1212 1213 1214
		return;
	}

	/* channel switch handled in software */
1215
	if (csa_ie.count <= 1)
1216
		ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1217
	else
1218
		mod_timer(&ifmgd->chswitch_timer,
1219
			  TU_TO_EXP_TIME(csa_ie.count * cbss->beacon_interval));
1220 1221
}

1222 1223 1224 1225 1226 1227
static bool
ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
				 struct ieee80211_channel *channel,
				 const u8 *country_ie, u8 country_ie_len,
				 const u8 *pwr_constr_elem,
				 int *chan_pwr, int *pwr_reduction)
1228
{
1229 1230
	struct ieee80211_country_ie_triplet *triplet;
	int chan = ieee80211_frequency_to_channel(channel->center_freq);
1231
	int i, chan_increment;
1232
	bool have_chan_pwr = false;
1233

1234 1235
	/* Invalid IE */
	if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1236
		return false;
1237

1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251
	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;
1252
	}
1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263

	/* 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;
1264
				*chan_pwr = triplet->chans.max_power;
1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275
				break;
			}
		}
		if (have_chan_pwr)
			break;

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

1276 1277 1278 1279 1280
	if (have_chan_pwr)
		*pwr_reduction = *pwr_constr_elem;
	return have_chan_pwr;
}

1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294
static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
				      struct ieee80211_channel *channel,
				      const u8 *cisco_dtpc_ie,
				      int *pwr_level)
{
	/* From practical testing, the first data byte of the DTPC element
	 * seems to contain the requested dBm level, and the CLI on Cisco
	 * APs clearly state the range is -127 to 127 dBm, which indicates
	 * a signed byte, although it seemingly never actually goes negative.
	 * The other byte seems to always be zero.
	 */
	*pwr_level = (__s8)cisco_dtpc_ie[4];
}

1295 1296 1297 1298
static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_channel *channel,
				       struct ieee80211_mgmt *mgmt,
				       const u8 *country_ie, u8 country_ie_len,
1299 1300
				       const u8 *pwr_constr_ie,
				       const u8 *cisco_dtpc_ie)
1301
{
1302 1303 1304
	bool has_80211h_pwr = false, has_cisco_pwr = false;
	int chan_pwr = 0, pwr_reduction_80211h = 0;
	int pwr_level_cisco, pwr_level_80211h;
1305
	int new_ap_level;
1306

1307 1308 1309 1310 1311 1312
	if (country_ie && pwr_constr_ie &&
	    mgmt->u.probe_resp.capab_info &
		cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT)) {
		has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
			sdata, channel, country_ie, country_ie_len,
			pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1313 1314 1315 1316 1317 1318 1319 1320
		pwr_level_80211h =
			max_t(int, 0, chan_pwr - pwr_reduction_80211h);
	}

	if (cisco_dtpc_ie) {
		ieee80211_find_cisco_dtpc(
			sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
		has_cisco_pwr = true;
1321
	}
1322

1323
	if (!has_80211h_pwr && !has_cisco_pwr)
1324
		return 0;
1325

1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341
	/* If we have both 802.11h and Cisco DTPC, apply both limits
	 * by picking the smallest of the two power levels advertised.
	 */
	if (has_80211h_pwr &&
	    (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
		sdata_info(sdata,
			   "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
			   pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
			   sdata->u.mgd.bssid);
		new_ap_level = pwr_level_80211h;
	} else {  /* has_cisco_pwr is always true here. */
		sdata_info(sdata,
			   "Limiting TX power to %d dBm as advertised by %pM\n",
			   pwr_level_cisco, sdata->u.mgd.bssid);
		new_ap_level = pwr_level_cisco;
	}
1342

1343 1344
	if (sdata->ap_power_level == new_ap_level)
		return 0;
1345

1346 1347 1348 1349
	sdata->ap_power_level = new_ap_level;
	if (__ieee80211_recalc_txpower(sdata))
		return BSS_CHANGED_TXPOWER;
	return 0;
1350 1351
}

1352 1353 1354 1355 1356 1357
/* 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
1358 1359 1360 1361
	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
1362
	if (local->scanning)
J
Johannes Berg 已提交
1363 1364
		return;

1365 1366 1367 1368 1369 1370 1371
	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);
1372

1373 1374 1375 1376 1377 1378
		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);
1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395
	}
}

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);
	}
}

1396 1397 1398 1399
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
1400
	bool authorized = false;
1401 1402 1403 1404

	if (!mgd->powersave)
		return false;

1405 1406 1407
	if (mgd->broken_ap)
		return false;

1408 1409 1410
	if (!mgd->associated)
		return false;

1411
	if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1412 1413
		return false;

1414
	if (!mgd->have_beacon)
1415 1416
		return false;

1417 1418 1419
	rcu_read_lock();
	sta = sta_info_get(sdata, mgd->bssid);
	if (sta)
J
Johannes Berg 已提交
1420
		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1421 1422
	rcu_read_unlock();

J
Johannes Berg 已提交
1423
	return authorized;
1424 1425
}

1426
/* need to hold RTNL or interface lock */
1427
void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1428 1429 1430
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;
1431
	int timeout;
1432 1433 1434 1435 1436 1437 1438

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

	list_for_each_entry(sdata, &local->interfaces, list) {
1439
		if (!ieee80211_sdata_running(sdata))
1440
			continue;
1441 1442 1443 1444 1445 1446 1447 1448
		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;
		}
1449 1450 1451 1452 1453 1454
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

1455
	if (count == 1 && ieee80211_powersave_allowed(found)) {
1456 1457 1458
		s32 beaconint_us;

		if (latency < 0)
M
Mark Gross 已提交
1459
			latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1460 1461 1462 1463

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

1464
		timeout = local->dynamic_ps_forced_timeout;
1465 1466
		if (timeout < 0) {
			/*
1467 1468
			 * Go to full PSM if the user configures a very low
			 * latency requirement.
1469 1470 1471
			 * The 2000 second value is there for compatibility
			 * until the PM_QOS_NETWORK_LATENCY is configured
			 * with real values.
1472
			 */
1473 1474
			if (latency > (1900 * USEC_PER_MSEC) &&
			    latency != (2000 * USEC_PER_SEC))
1475
				timeout = 0;
1476 1477
			else
				timeout = 100;
1478
		}
1479
		local->hw.conf.dynamic_ps_timeout = timeout;
1480

1481
		if (beaconint_us > latency) {
1482
			local->ps_sdata = NULL;
1483 1484
		} else {
			int maxslp = 1;
1485
			u8 dtimper = found->u.mgd.dtim_period;
1486 1487 1488 1489 1490

			/* If the TIM IE is invalid, pretend the value is 1 */
			if (!dtimper)
				dtimper = 1;
			else if (dtimper > 1)
1491 1492 1493
				maxslp = min_t(int, dtimper,
						    latency / beaconint_us);

1494
			local->hw.conf.max_sleep_period = maxslp;
1495
			local->hw.conf.ps_dtim_period = dtimper;
1496
			local->ps_sdata = found;
1497
		}
1498
	} else {
1499
		local->ps_sdata = NULL;
1500
	}
1501 1502 1503 1504

	ieee80211_change_ps(local);
}

E
Eliad Peller 已提交
1505 1506 1507 1508 1509 1510 1511 1512 1513 1514
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);
	}
}

1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526
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,
1527
					IEEE80211_MAX_QUEUE_MAP,
1528 1529
					IEEE80211_QUEUE_STOP_REASON_PS,
					false);
1530 1531 1532 1533 1534 1535 1536 1537
}

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;
1538
	struct ieee80211_if_managed *ifmgd;
1539 1540
	unsigned long flags;
	int q;
1541 1542 1543 1544 1545

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

1546 1547
	ifmgd = &sdata->u.mgd;

1548 1549 1550
	if (local->hw.conf.flags & IEEE80211_CONF_PS)
		return;

1551
	if (local->hw.conf.dynamic_ps_timeout > 0) {
1552 1553
		/* don't enter PS if TX frames are pending */
		if (drv_tx_frames_pending(local)) {
1554 1555 1556 1557 1558
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
			return;
		}
1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576

		/*
		 * 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);
1577 1578
	}

1579
	if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1580
	    !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1581
		if (drv_tx_frames_pending(local)) {
1582 1583 1584
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
1585
		} else {
1586 1587
			ieee80211_send_nullfunc(local, sdata, 1);
			/* Flush to get the tx status of nullfunc frame */
1588
			ieee80211_flush_queues(local, sdata);
1589
		}
1590 1591
	}

1592 1593
	if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
	      (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1594 1595 1596 1597 1598
	    (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);
	}
1599 1600 1601 1602 1603 1604
}

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

1605
	if (local->quiescing || local->suspended)
1606 1607
		return;

1608
	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1609 1610
}

1611 1612 1613 1614 1615 1616 1617
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);
1618
	struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1619

1620 1621 1622 1623 1624 1625 1626 1627
	mutex_lock(&sdata->local->mtx);
	if (sdata->wdev.cac_started) {
		ieee80211_vif_release_channel(sdata);
		cfg80211_cac_event(sdata->dev, &chandef,
				   NL80211_RADAR_CAC_FINISHED,
				   GFP_KERNEL);
	}
	mutex_unlock(&sdata->local->mtx);
1628 1629
}

1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718
static bool
__ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	bool ret;
	int ac;

	if (local->hw.queues < IEEE80211_NUM_ACS)
		return false;

	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
		struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
		int non_acm_ac;
		unsigned long now = jiffies;

		if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
		    tx_tspec->admitted_time &&
		    time_after(now, tx_tspec->time_slice_start + HZ)) {
			tx_tspec->consumed_tx_time = 0;
			tx_tspec->time_slice_start = now;

			if (tx_tspec->downgraded)
				tx_tspec->action =
					TX_TSPEC_ACTION_STOP_DOWNGRADE;
		}

		switch (tx_tspec->action) {
		case TX_TSPEC_ACTION_STOP_DOWNGRADE:
			/* take the original parameters */
			if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
				sdata_err(sdata,
					  "failed to set TX queue parameters for queue %d\n",
					  ac);
			tx_tspec->action = TX_TSPEC_ACTION_NONE;
			tx_tspec->downgraded = false;
			ret = true;
			break;
		case TX_TSPEC_ACTION_DOWNGRADE:
			if (time_after(now, tx_tspec->time_slice_start + HZ)) {
				tx_tspec->action = TX_TSPEC_ACTION_NONE;
				ret = true;
				break;
			}
			/* downgrade next lower non-ACM AC */
			for (non_acm_ac = ac + 1;
			     non_acm_ac < IEEE80211_NUM_ACS;
			     non_acm_ac++)
				if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
					break;
			/* The loop will result in using BK even if it requires
			 * admission control, such configuration makes no sense
			 * and we have to transmit somehow - the AC selection
			 * does the same thing.
			 */
			if (drv_conf_tx(local, sdata, ac,
					&sdata->tx_conf[non_acm_ac]))
				sdata_err(sdata,
					  "failed to set TX queue parameters for queue %d\n",
					  ac);
			tx_tspec->action = TX_TSPEC_ACTION_NONE;
			ret = true;
			schedule_delayed_work(&ifmgd->tx_tspec_wk,
				tx_tspec->time_slice_start + HZ - now + 1);
			break;
		case TX_TSPEC_ACTION_NONE:
			/* nothing now */
			break;
		}
	}

	return ret;
}

void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
{
	if (__ieee80211_sta_handle_tspec_ac_params(sdata))
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
}

static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
{
	struct ieee80211_sub_if_data *sdata;

	sdata = container_of(work, struct ieee80211_sub_if_data,
			     u.mgd.tx_tspec_wk.work);
	ieee80211_sta_handle_tspec_ac_params(sdata);
}

J
Johannes Berg 已提交
1719
/* MLME */
1720
static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1721
				     struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
1722
				     const u8 *wmm_param, size_t wmm_param_len)
1723 1724
{
	struct ieee80211_tx_queue_params params;
1725
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1726 1727
	size_t left;
	int count;
J
Johannes Berg 已提交
1728 1729
	const u8 *pos;
	u8 uapsd_queues = 0;
1730

1731
	if (!local->ops->conf_tx)
1732
		return false;
1733

J
Johannes Berg 已提交
1734
	if (local->hw.queues < IEEE80211_NUM_ACS)
1735
		return false;
1736 1737

	if (!wmm_param)
1738
		return false;
1739

1740
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1741
		return false;
K
Kalle Valo 已提交
1742 1743

	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1744
		uapsd_queues = ifmgd->uapsd_queues;
K
Kalle Valo 已提交
1745

1746
	count = wmm_param[6] & 0x0f;
1747
	if (count == ifmgd->wmm_last_param_set)
1748
		return false;
1749
	ifmgd->wmm_last_param_set = count;
1750 1751 1752 1753 1754 1755

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

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

Y
Yoni Divinsky 已提交
1756
	sdata->wmm_acm = 0;
1757 1758 1759
	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
1760
		bool uapsd = false;
1761 1762 1763
		int queue;

		switch (aci) {
1764
		case 1: /* AC_BK */
J
Johannes Berg 已提交
1765
			queue = 3;
J
Johannes Berg 已提交
1766
			if (acm)
Y
Yoni Divinsky 已提交
1767
				sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
K
Kalle Valo 已提交
1768 1769
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
				uapsd = true;
1770
			break;
1771
		case 2: /* AC_VI */
J
Johannes Berg 已提交
1772
			queue = 1;
J
Johannes Berg 已提交
1773
			if (acm)
Y
Yoni Divinsky 已提交
1774
				sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
K
Kalle Valo 已提交
1775 1776
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
				uapsd = true;
1777
			break;
1778
		case 3: /* AC_VO */
J
Johannes Berg 已提交
1779
			queue = 0;
J
Johannes Berg 已提交
1780
			if (acm)
Y
Yoni Divinsky 已提交
1781
				sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
K
Kalle Valo 已提交
1782 1783
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
				uapsd = true;
1784
			break;
1785
		case 0: /* AC_BE */
1786
		default:
J
Johannes Berg 已提交
1787
			queue = 2;
J
Johannes Berg 已提交
1788
			if (acm)
Y
Yoni Divinsky 已提交
1789
				sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
K
Kalle Valo 已提交
1790 1791
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
				uapsd = true;
1792 1793 1794 1795 1796 1797
			break;
		}

		params.aifs = pos[0] & 0x0f;
		params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params.cw_min = ecw2cw(pos[1] & 0x0f);
1798
		params.txop = get_unaligned_le16(pos + 2);
1799
		params.acm = acm;
K
Kalle Valo 已提交
1800 1801
		params.uapsd = uapsd;

J
Johannes Berg 已提交
1802
		mlme_dbg(sdata,
1803
			 "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
J
Johannes Berg 已提交
1804 1805
			 queue, aci, acm,
			 params.aifs, params.cw_min, params.cw_max,
1806 1807
			 params.txop, params.uapsd,
			 ifmgd->tx_tspec[queue].downgraded);
1808
		sdata->tx_conf[queue] = params;
1809 1810
		if (!ifmgd->tx_tspec[queue].downgraded &&
		    drv_conf_tx(local, sdata, queue, &params))
J
Johannes Berg 已提交
1811 1812 1813
			sdata_err(sdata,
				  "failed to set TX queue parameters for queue %d\n",
				  queue);
1814
	}
1815 1816

	/* enable WMM or activate new settings */
1817
	sdata->vif.bss_conf.qos = true;
1818
	return true;
1819 1820
}

1821 1822 1823 1824
static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
{
	lockdep_assert_held(&sdata->local->mtx);

1825
	sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1826 1827 1828 1829 1830 1831 1832 1833 1834 1835
	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
1836 1837
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
1838
{
J
Johannes Berg 已提交
1839
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1840
	u32 changed = 0;
J
Johannes Berg 已提交
1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853
	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
1854
	if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1855
		use_short_slot = true;
1856

1857 1858 1859
	if (use_protection != bss_conf->use_cts_prot) {
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
1860
	}
1861

1862 1863
	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
1864
		changed |= BSS_CHANGED_ERP_PREAMBLE;
1865
	}
1866

J
Johannes Berg 已提交
1867 1868 1869
	if (use_short_slot != bss_conf->use_short_slot) {
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
1870 1871 1872 1873 1874
	}

	return changed;
}

1875
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1876
				     struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
1877
				     u32 bss_info_changed)
1878
{
1879
	struct ieee80211_bss *bss = (void *)cbss->priv;
1880
	struct ieee80211_local *local = sdata->local;
1881
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1882

J
Johannes Berg 已提交
1883
	bss_info_changed |= BSS_CHANGED_ASSOC;
1884
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1885
		bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1886

1887
	sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1888
		beacon_loss_count * bss_conf->beacon_int));
1889

1890 1891
	sdata->u.mgd.associated = cbss;
	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1892

1893 1894
	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;

1895
	if (sdata->vif.p2p) {
1896
		const struct cfg80211_bss_ies *ies;
1897

1898 1899 1900 1901 1902 1903 1904 1905
		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
1906 1907
					(u8 *) &bss_conf->p2p_noa_attr,
					sizeof(bss_conf->p2p_noa_attr));
1908
			if (ret >= 2) {
J
Janusz Dziedzic 已提交
1909 1910
				sdata->u.mgd.p2p_noa_index =
					bss_conf->p2p_noa_attr.index;
1911 1912
				bss_info_changed |= BSS_CHANGED_P2P_PS;
			}
1913
		}
1914
		rcu_read_unlock();
1915 1916
	}

J
Johannes Berg 已提交
1917
	/* just to be sure */
1918
	ieee80211_stop_poll(sdata);
J
Johannes Berg 已提交
1919

1920
	ieee80211_led_assoc(local, 1);
1921

1922
	if (sdata->u.mgd.have_beacon) {
1923 1924 1925 1926 1927 1928 1929
		/*
		 * 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;
1930
		bss_conf->beacon_rate = bss->beacon_rate;
1931
		bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1932
	} else {
1933
		bss_conf->beacon_rate = NULL;
1934
		bss_conf->dtim_period = 0;
1935
	}
1936

1937
	bss_conf->assoc = 1;
1938

1939
	/* Tell the driver to monitor connection quality (if supported) */
1940
	if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1941
	    bss_conf->cqm_rssi_thold)
1942 1943
		bss_info_changed |= BSS_CHANGED_CQM;

1944
	/* Enable ARP filtering */
1945
	if (bss_conf->arp_addr_cnt)
1946 1947
		bss_info_changed |= BSS_CHANGED_ARP_FILTER;

J
Johannes Berg 已提交
1948
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1949

J
Johannes Berg 已提交
1950 1951 1952
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
	mutex_unlock(&local->iflist_mtx);
1953

1954
	ieee80211_recalc_smps(sdata);
E
Eliad Peller 已提交
1955 1956
	ieee80211_recalc_ps_vif(sdata);

1957
	netif_carrier_on(sdata->dev);
1958 1959
}

1960
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1961 1962
				   u16 stype, u16 reason, bool tx,
				   u8 *frame_buf)
1963
{
1964
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1965
	struct ieee80211_local *local = sdata->local;
1966
	u32 changed = 0;
1967

1968
	sdata_assert_lock(sdata);
1969

1970 1971 1972
	if (WARN_ON_ONCE(tx && !frame_buf))
		return;

J
Johannes Berg 已提交
1973 1974 1975
	if (WARN_ON(!ifmgd->associated))
		return;

1976 1977
	ieee80211_stop_poll(sdata);

1978
	ifmgd->associated = NULL;
1979 1980
	netif_carrier_off(sdata->dev);

1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991
	/*
	 * 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
1992 1993 1994
	/* disable per-vif ps */
	ieee80211_recalc_ps_vif(sdata);

1995 1996
	/* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
	if (tx)
1997
		ieee80211_flush_queues(local, sdata);
1998

1999 2000
	/* deauthenticate/disassociate now */
	if (tx || frame_buf)
2001 2002
		ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
					       reason, tx, frame_buf);
2003 2004 2005

	/* flush out frame */
	if (tx)
2006
		ieee80211_flush_queues(local, sdata);
2007

2008 2009 2010
	/* clear bssid only after building the needed mgmt frames */
	memset(ifmgd->bssid, 0, ETH_ALEN);

2011
	/* remove AP and TDLS peers */
2012
	sta_info_flush(sdata);
2013 2014

	/* finally reset all BSS / config parameters */
2015 2016 2017
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
J
Johannes Berg 已提交
2018 2019
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
2020

J
Janusz Dziedzic 已提交
2021 2022 2023
	ifmgd->p2p_noa_index = -1;
	memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
	       sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2024

2025
	/* on the next assoc, re-program HT/VHT parameters */
B
Ben Greear 已提交
2026 2027
	memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
	memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2028 2029
	memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
	memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2030

2031
	sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2032

2033 2034 2035
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

2036
	/* Disable ARP filtering */
2037
	if (sdata->vif.bss_conf.arp_addr_cnt)
2038 2039
		changed |= BSS_CHANGED_ARP_FILTER;

2040 2041 2042
	sdata->vif.bss_conf.qos = false;
	changed |= BSS_CHANGED_QOS;

2043 2044
	/* The BSSID (not really interesting) and HT changed */
	changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
J
Johannes Berg 已提交
2045
	ieee80211_bss_info_change_notify(sdata, changed);
2046

2047 2048 2049
	/* disassociated - set to defaults now */
	ieee80211_set_wmm_default(sdata, false);

2050 2051 2052 2053
	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);
2054

2055
	sdata->vif.bss_conf.dtim_period = 0;
2056 2057
	sdata->vif.bss_conf.beacon_rate = NULL;

2058
	ifmgd->have_beacon = false;
2059

2060
	ifmgd->flags = 0;
2061
	mutex_lock(&local->mtx);
2062
	ieee80211_vif_release_channel(sdata);
2063 2064

	sdata->vif.csa_active = false;
2065
	ifmgd->csa_waiting_bcn = false;
2066 2067 2068 2069 2070
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
2071
	mutex_unlock(&local->mtx);
2072

2073 2074 2075 2076
	/* existing TX TSPEC sessions no longer exist */
	memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
	cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);

2077
	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2078
}
2079

2080 2081 2082 2083 2084 2085 2086 2087
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
2088 2089
	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
2090
	 */
J
Johannes Berg 已提交
2091 2092 2093
	if (is_multicast_ether_addr(hdr->addr1))
		return;

2094
	ieee80211_sta_reset_conn_monitor(sdata);
2095
}
2096

2097 2098 2099
static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2100
	struct ieee80211_local *local = sdata->local;
2101

2102
	mutex_lock(&local->mtx);
2103 2104
	if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
		goto out;
2105

2106
	__ieee80211_stop_poll(sdata);
2107 2108 2109 2110

	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
	mutex_unlock(&local->iflist_mtx);
2111 2112

	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
2113
		goto out;
2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124

	/*
	 * 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));
2125 2126
out:
	mutex_unlock(&local->mtx);
2127 2128
}

2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163
static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
					   struct ieee80211_hdr *hdr,
					   u16 tx_time)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
	int ac = ieee80211_ac_from_tid(tid);
	struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
	unsigned long now = jiffies;

	if (likely(!tx_tspec->admitted_time))
		return;

	if (time_after(now, tx_tspec->time_slice_start + HZ)) {
		tx_tspec->consumed_tx_time = 0;
		tx_tspec->time_slice_start = now;

		if (tx_tspec->downgraded) {
			tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
			schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
		}
	}

	if (tx_tspec->downgraded)
		return;

	tx_tspec->consumed_tx_time += tx_time;

	if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
		tx_tspec->downgraded = true;
		tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
		schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
	}
}

2164
void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2165
			     struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2166
{
2167 2168
	ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);

F
Felix Fietkau 已提交
2169
	if (!ieee80211_is_data(hdr->frame_control))
2170 2171 2172 2173
	    return;

	if (ieee80211_is_nullfunc(hdr->frame_control) &&
	    sdata->u.mgd.probe_send_count > 0) {
2174
		if (ack)
2175
			ieee80211_sta_reset_conn_monitor(sdata);
2176 2177
		else
			sdata->u.mgd.nullfunc_failed = true;
2178
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2179
		return;
2180
	}
2181 2182 2183

	if (ack)
		ieee80211_sta_reset_conn_monitor(sdata);
2184 2185
}

2186 2187 2188 2189
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ssid;
2190
	u8 *dst = ifmgd->associated->bssid;
2191
	u8 unicast_limit = max(1, max_probe_tries - 3);
2192 2193 2194 2195 2196 2197 2198 2199

	/*
	 * 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;
2200

2201 2202 2203 2204 2205 2206 2207
	/*
	 * 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.
	 */
2208 2209
	ifmgd->probe_send_count++;

2210 2211
	if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
		ifmgd->nullfunc_failed = false;
2212
		ieee80211_send_nullfunc(sdata->local, sdata, 0);
2213
	} else {
2214 2215
		int ssid_len;

2216
		rcu_read_lock();
2217
		ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2218 2219 2220 2221 2222 2223
		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,
2224
					 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
2225
					 ifmgd->associated->channel, false);
2226
		rcu_read_unlock();
2227
	}
2228

2229
	ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2230
	run_again(sdata, ifmgd->probe_timeout);
2231 2232
}

J
Johannes Berg 已提交
2233 2234
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
				   bool beacon)
2235 2236
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
2237
	bool already = false;
2238

2239
	if (!ieee80211_sdata_running(sdata))
2240 2241
		return;

2242
	sdata_lock(sdata);
2243 2244 2245 2246

	if (!ifmgd->associated)
		goto out;

2247 2248 2249 2250 2251 2252 2253
	mutex_lock(&sdata->local->mtx);

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

2254
	if (beacon) {
J
Johannes Berg 已提交
2255
		mlme_dbg_ratelimited(sdata,
2256 2257
				     "detected beacon loss from AP (missed %d beacons) - probing\n",
				     beacon_loss_count);
J
Johannes Berg 已提交
2258

2259 2260 2261 2262
		ieee80211_cqm_rssi_notify(&sdata->vif,
					  NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
					  GFP_KERNEL);
	}
2263

J
Johannes Berg 已提交
2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274
	/*
	 * 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!
	 */
2275
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
J
Johannes Berg 已提交
2276 2277
		already = true;

E
Eliad Peller 已提交
2278 2279
	ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;

2280 2281
	mutex_unlock(&sdata->local->mtx);

J
Johannes Berg 已提交
2282 2283 2284
	if (already)
		goto out;

2285 2286 2287 2288
	mutex_lock(&sdata->local->iflist_mtx);
	ieee80211_recalc_ps(sdata->local, -1);
	mutex_unlock(&sdata->local->iflist_mtx);

2289 2290
	ifmgd->probe_send_count = 0;
	ieee80211_mgd_probe_ap_send(sdata);
2291
 out:
2292
	sdata_unlock(sdata);
2293 2294
}

2295 2296 2297 2298 2299
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;
2300
	struct cfg80211_bss *cbss;
2301 2302
	struct sk_buff *skb;
	const u8 *ssid;
2303
	int ssid_len;
2304 2305 2306 2307

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

2308
	sdata_assert_lock(sdata);
2309

2310 2311 2312 2313 2314 2315 2316
	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
2317 2318
		return NULL;

2319
	rcu_read_lock();
2320
	ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2321 2322 2323 2324 2325
	if (WARN_ON_ONCE(ssid == NULL))
		ssid_len = 0;
	else
		ssid_len = ssid[1];

2326
	skb = ieee80211_build_probe_req(sdata, cbss->bssid,
J
Johannes Berg 已提交
2327
					(u32) -1, cbss->channel,
2328
					ssid + 2, ssid_len,
2329
					NULL, 0, true);
2330
	rcu_read_unlock();
2331 2332 2333 2334 2335

	return skb;
}
EXPORT_SYMBOL(ieee80211_ap_probereq_get);

2336
static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2337
{
2338
	struct ieee80211_local *local = sdata->local;
2339
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2340
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2341

2342
	sdata_lock(sdata);
2343
	if (!ifmgd->associated) {
2344
		sdata_unlock(sdata);
2345 2346 2347
		return;
	}

2348 2349
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
			       WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2350
			       true, frame_buf);
2351
	mutex_lock(&local->mtx);
2352
	sdata->vif.csa_active = false;
2353
	ifmgd->csa_waiting_bcn = false;
2354 2355 2356 2357 2358
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
2359
	mutex_unlock(&local->mtx);
2360

2361 2362
	cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
			      IEEE80211_DEAUTH_FRAME_LEN);
2363
	sdata_unlock(sdata);
2364 2365
}

2366
static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
J
Johannes Berg 已提交
2367 2368 2369
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
2370
			     u.mgd.beacon_connection_loss_work);
2371 2372 2373 2374
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct sta_info *sta;

	if (ifmgd->associated) {
2375
		rcu_read_lock();
2376 2377 2378
		sta = sta_info_get(sdata, ifmgd->bssid);
		if (sta)
			sta->beacon_loss_count++;
2379
		rcu_read_unlock();
2380
	}
J
Johannes Berg 已提交
2381

2382
	if (ifmgd->connection_loss) {
2383 2384
		sdata_info(sdata, "Connection to AP %pM lost\n",
			   ifmgd->bssid);
2385
		__ieee80211_disconnect(sdata);
2386
	} else {
2387
		ieee80211_mgd_probe_ap(sdata, true);
2388 2389 2390 2391 2392 2393 2394 2395 2396
	}
}

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);

2397
	__ieee80211_disconnect(sdata);
J
Johannes Berg 已提交
2398 2399
}

2400 2401 2402
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2403
	struct ieee80211_hw *hw = &sdata->local->hw;
2404

J
Johannes Berg 已提交
2405 2406
	trace_api_beacon_loss(sdata);

2407
	sdata->u.mgd.connection_loss = false;
2408
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2409 2410 2411
}
EXPORT_SYMBOL(ieee80211_beacon_loss);

2412 2413 2414 2415 2416
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
2417 2418
	trace_api_connection_loss(sdata);

2419
	sdata->u.mgd.connection_loss = true;
2420 2421 2422 2423 2424
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_connection_loss);


J
Johannes Berg 已提交
2425 2426 2427 2428 2429
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;

2430
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2431 2432 2433 2434 2435 2436

	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);
2437
		sdata->u.mgd.flags = 0;
2438
		mutex_lock(&sdata->local->mtx);
J
Johannes Berg 已提交
2439
		ieee80211_vif_release_channel(sdata);
2440
		mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
2441 2442
	}

2443
	cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
J
Johannes Berg 已提交
2444 2445 2446 2447 2448 2449 2450
	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)
{
2451
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
2452 2453 2454
	struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
	u8 *pos;
	struct ieee802_11_elems elems;
2455
	u32 tx_flags = 0;
J
Johannes Berg 已提交
2456 2457

	pos = mgmt->u.auth.variable;
2458
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2459 2460 2461
	if (!elems.challenge)
		return;
	auth_data->expected_transaction = 4;
J
Johannes Berg 已提交
2462
	drv_mgd_prepare_tx(sdata->local, sdata);
2463 2464 2465
	if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
		tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
			   IEEE80211_TX_INTFL_MLME_CONN_TX;
2466
	ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
J
Johannes Berg 已提交
2467 2468 2469
			    elems.challenge - 2, elems.challenge_len + 2,
			    auth_data->bss->bssid, auth_data->bss->bssid,
			    auth_data->key, auth_data->key_len,
2470
			    auth_data->key_idx, tx_flags);
J
Johannes Berg 已提交
2471 2472
}

2473 2474
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
2475 2476 2477 2478 2479 2480
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u8 bssid[ETH_ALEN];
	u16 auth_alg, auth_transaction, status_code;
	struct sta_info *sta;

2481
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2482 2483

	if (len < 24 + 6)
2484
		return;
J
Johannes Berg 已提交
2485 2486

	if (!ifmgd->auth_data || ifmgd->auth_data->done)
2487
		return;
J
Johannes Berg 已提交
2488 2489 2490

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

2491
	if (!ether_addr_equal(bssid, mgmt->bssid))
2492
		return;
J
Johannes Berg 已提交
2493 2494 2495 2496 2497 2498

	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 ||
2499 2500 2501 2502 2503
	    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);
2504
		return;
2505
	}
J
Johannes Berg 已提交
2506 2507

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
2508 2509
		sdata_info(sdata, "%pM denied authentication (status %d)\n",
			   mgmt->sa, status_code);
2510
		ieee80211_destroy_auth_data(sdata, false);
2511
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2512
		return;
J
Johannes Berg 已提交
2513 2514 2515 2516 2517 2518
	}

	switch (ifmgd->auth_data->algorithm) {
	case WLAN_AUTH_OPEN:
	case WLAN_AUTH_LEAP:
	case WLAN_AUTH_FT:
2519
	case WLAN_AUTH_SAE:
J
Johannes Berg 已提交
2520 2521 2522 2523 2524
		break;
	case WLAN_AUTH_SHARED_KEY:
		if (ifmgd->auth_data->expected_transaction != 4) {
			ieee80211_auth_challenge(sdata, mgmt, len);
			/* need another frame */
2525
			return;
J
Johannes Berg 已提交
2526 2527 2528 2529 2530
		}
		break;
	default:
		WARN_ONCE(1, "invalid auth alg %d",
			  ifmgd->auth_data->algorithm);
2531
		return;
J
Johannes Berg 已提交
2532 2533
	}

J
Johannes Berg 已提交
2534
	sdata_info(sdata, "authenticated\n");
J
Johannes Berg 已提交
2535 2536
	ifmgd->auth_data->done = true;
	ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2537
	ifmgd->auth_data->timeout_started = true;
2538
	run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
2539

2540 2541 2542 2543 2544 2545
	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.
		 */
2546
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2547
		return;
2548 2549
	}

J
Johannes Berg 已提交
2550 2551 2552 2553 2554 2555 2556 2557
	/* 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
2558
		sdata_info(sdata, "failed moving %pM to auth\n", bssid);
J
Johannes Berg 已提交
2559 2560 2561 2562
		goto out_err;
	}
	mutex_unlock(&sdata->local->sta_mtx);

2563
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2564
	return;
J
Johannes Berg 已提交
2565 2566 2567 2568 2569
 out_err:
	mutex_unlock(&sdata->local->sta_mtx);
	/* ignore frame -- wait for timeout */
}

2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625
#define case_WLAN(type) \
	case WLAN_REASON_##type: return #type

static const char *ieee80211_get_reason_code_string(u16 reason_code)
{
	switch (reason_code) {
	case_WLAN(UNSPECIFIED);
	case_WLAN(PREV_AUTH_NOT_VALID);
	case_WLAN(DEAUTH_LEAVING);
	case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
	case_WLAN(DISASSOC_AP_BUSY);
	case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
	case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
	case_WLAN(DISASSOC_STA_HAS_LEFT);
	case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
	case_WLAN(DISASSOC_BAD_POWER);
	case_WLAN(DISASSOC_BAD_SUPP_CHAN);
	case_WLAN(INVALID_IE);
	case_WLAN(MIC_FAILURE);
	case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
	case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
	case_WLAN(IE_DIFFERENT);
	case_WLAN(INVALID_GROUP_CIPHER);
	case_WLAN(INVALID_PAIRWISE_CIPHER);
	case_WLAN(INVALID_AKMP);
	case_WLAN(UNSUPP_RSN_VERSION);
	case_WLAN(INVALID_RSN_IE_CAP);
	case_WLAN(IEEE8021X_FAILED);
	case_WLAN(CIPHER_SUITE_REJECTED);
	case_WLAN(DISASSOC_UNSPECIFIED_QOS);
	case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
	case_WLAN(DISASSOC_LOW_ACK);
	case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
	case_WLAN(QSTA_LEAVE_QBSS);
	case_WLAN(QSTA_NOT_USE);
	case_WLAN(QSTA_REQUIRE_SETUP);
	case_WLAN(QSTA_TIMEOUT);
	case_WLAN(QSTA_CIPHER_NOT_SUPP);
	case_WLAN(MESH_PEER_CANCELED);
	case_WLAN(MESH_MAX_PEERS);
	case_WLAN(MESH_CONFIG);
	case_WLAN(MESH_CLOSE);
	case_WLAN(MESH_MAX_RETRIES);
	case_WLAN(MESH_CONFIRM_TIMEOUT);
	case_WLAN(MESH_INVALID_GTK);
	case_WLAN(MESH_INCONSISTENT_PARAM);
	case_WLAN(MESH_INVALID_SECURITY);
	case_WLAN(MESH_PATH_ERROR);
	case_WLAN(MESH_PATH_NOFORWARD);
	case_WLAN(MESH_PATH_DEST_UNREACHABLE);
	case_WLAN(MAC_EXISTS_IN_MBSS);
	case_WLAN(MESH_CHAN_REGULATORY);
	case_WLAN(MESH_CHAN);
	default: return "<unknown>";
	}
}
J
Johannes Berg 已提交
2626

2627 2628
static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
2629
{
2630
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2631
	const u8 *bssid = NULL;
2632 2633
	u16 reason_code;

2634
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2635

2636
	if (len < 24 + 2)
2637
		return;
2638

J
Johannes Berg 已提交
2639
	if (!ifmgd->associated ||
2640
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2641
		return;
2642

2643
	bssid = ifmgd->associated->bssid;
2644 2645 2646

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

2647 2648
	sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
		   bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
2649

2650 2651
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2652
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2653 2654 2655
}


2656 2657
static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_mgmt *mgmt, size_t len)
2658
{
2659
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2660 2661
	u16 reason_code;

2662
	sdata_assert_lock(sdata);
2663

J
Johannes Berg 已提交
2664
	if (len < 24 + 2)
2665
		return;
2666

J
Johannes Berg 已提交
2667
	if (!ifmgd->associated ||
2668
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2669
		return;
2670 2671 2672

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

J
Johannes Berg 已提交
2673 2674
	sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
		   mgmt->sa, reason_code);
2675

2676 2677
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2678
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2679 2680
}

2681 2682 2683 2684
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,
2685 2686
				int *min_rate, int *min_rate_index,
				int shift, u32 rate_flags)
2687 2688 2689 2690
{
	int i, j;

	for (i = 0; i < supp_rates_len; i++) {
2691
		int rate = supp_rates[i] & 0x7f;
2692 2693
		bool is_basic = !!(supp_rates[i] & 0x80);

2694
		if ((rate * 5 * (1 << shift)) > 110)
2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709
			*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++) {
2710 2711 2712 2713 2714 2715 2716 2717 2718
			struct ieee80211_rate *br;
			int brate;

			br = &sband->bitrates[j];
			if ((rate_flags & br->flags) != rate_flags)
				continue;

			brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
			if (brate == rate) {
2719 2720 2721
				*rates |= BIT(j);
				if (is_basic)
					*basic_rates |= BIT(j);
2722 2723
				if ((rate * 5) < *min_rate) {
					*min_rate = rate * 5;
2724 2725 2726 2727 2728 2729 2730
					*min_rate_index = j;
				}
				break;
			}
		}
	}
}
2731

J
Johannes Berg 已提交
2732 2733 2734 2735 2736
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;

2737
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2738 2739 2740 2741 2742 2743

	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);
2744
		sdata->u.mgd.flags = 0;
2745
		mutex_lock(&sdata->local->mtx);
J
Johannes Berg 已提交
2746
		ieee80211_vif_release_channel(sdata);
2747
		mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
2748 2749 2750 2751 2752 2753 2754 2755
	}

	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
2756
				    struct ieee80211_mgmt *mgmt, size_t len)
2757
{
2758
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2759
	struct ieee80211_local *local = sdata->local;
2760
	struct ieee80211_supported_band *sband;
2761
	struct sta_info *sta;
J
Johannes Berg 已提交
2762 2763
	u8 *pos;
	u16 capab_info, aid;
2764
	struct ieee802_11_elems elems;
J
Johannes Berg 已提交
2765
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2766 2767
	const struct cfg80211_bss_ies *bss_ies = NULL;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
J
Johannes Berg 已提交
2768
	u32 changed = 0;
2769
	int err;
2770
	bool ret;
2771

J
Johannes Berg 已提交
2772
	/* AssocResp and ReassocResp have identical structure */
2773 2774

	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
J
Johannes Berg 已提交
2775
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2776

2777
	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
J
Johannes Berg 已提交
2778 2779
		sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
			   aid);
2780 2781
	aid &= ~(BIT(15) | BIT(14));

2782 2783 2784
	ifmgd->broken_ap = false;

	if (aid == 0 || aid > IEEE80211_MAX_AID) {
J
Johannes Berg 已提交
2785 2786
		sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
			   aid);
2787 2788 2789 2790
		aid = 0;
		ifmgd->broken_ap = true;
	}

J
Johannes Berg 已提交
2791
	pos = mgmt->u.assoc_resp.variable;
2792
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2793

2794
	if (!elems.supp_rates) {
J
Johannes Berg 已提交
2795
		sdata_info(sdata, "no SuppRates element in AssocResp\n");
J
Johannes Berg 已提交
2796
		return false;
2797 2798
	}

2799
	ifmgd->aid = aid;
2800

2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863
	/*
	 * Some APs are erroneously not including some information in their
	 * (re)association response frames. Try to recover by using the data
	 * from the beacon or probe response. This seems to afflict mobile
	 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
	 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
	 */
	if ((assoc_data->wmm && !elems.wmm_param) ||
	    (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	     (!elems.ht_cap_elem || !elems.ht_operation)) ||
	    (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	     (!elems.vht_cap_elem || !elems.vht_operation))) {
		const struct cfg80211_bss_ies *ies;
		struct ieee802_11_elems bss_elems;

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

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

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

2864 2865 2866 2867 2868 2869 2870
	/*
	 * 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,
2871 2872 2873
			   "HT AP is missing WMM params or HT capability/operation\n");
		ret = false;
		goto out;
2874 2875 2876 2877 2878
	}

	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    (!elems.vht_cap_elem || !elems.vht_operation)) {
		sdata_info(sdata,
2879 2880 2881
			   "VHT AP is missing VHT capability/operation\n");
		ret = false;
		goto out;
2882 2883
	}

2884 2885 2886 2887 2888
	mutex_lock(&sdata->local->sta_mtx);
	/*
	 * station info was already allocated and inserted before
	 * the association and should be available to us
	 */
2889
	sta = sta_info_get(sdata, cbss->bssid);
2890 2891
	if (WARN_ON(!sta)) {
		mutex_unlock(&sdata->local->sta_mtx);
2892 2893
		ret = false;
		goto out;
2894
	}
2895

J
Johannes Berg 已提交
2896
	sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2897

2898
	/* Set up internal HT/VHT capabilities */
2899
	if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
B
Ben Greear 已提交
2900
		ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2901
						  elems.ht_cap_elem, sta);
2902

M
Mahesh Palivela 已提交
2903 2904
	if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
		ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2905
						    elems.vht_cap_elem, sta);
M
Mahesh Palivela 已提交
2906

2907 2908 2909 2910 2911 2912
	/*
	 * 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.
	 */
2913

2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928
	/*
	 * 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;
	}

2929
	rate_control_rate_init(sta);
2930

2931
	if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
J
Johannes Berg 已提交
2932
		set_sta_flag(sta, WLAN_STA_MFP);
2933

2934
	sta->sta.wme = elems.wmm_param;
2935

2936
	err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2937 2938 2939
	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
2940 2941 2942
		sdata_info(sdata,
			   "failed to move station %pM to desired state\n",
			   sta->sta.addr);
2943 2944
		WARN_ON(__sta_info_destroy(sta));
		mutex_unlock(&sdata->local->sta_mtx);
2945 2946
		ret = false;
		goto out;
2947 2948
	}

2949
	mutex_unlock(&sdata->local->sta_mtx);
2950

2951 2952 2953 2954 2955 2956 2957 2958
	/*
	 * 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;

2959
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2960
		ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
J
Johannes Berg 已提交
2961
					 elems.wmm_param_len);
2962
	else
2963 2964
		ieee80211_set_wmm_default(sdata, false);
	changed |= BSS_CHANGED_QOS;
2965

J
Johannes Berg 已提交
2966 2967 2968 2969
	/* set AID and assoc capability,
	 * ieee80211_set_associated() will tell the driver */
	bss_conf->aid = aid;
	bss_conf->assoc_capability = capab_info;
2970
	ieee80211_set_associated(sdata, cbss, changed);
2971

2972 2973 2974 2975 2976 2977 2978
	/*
	 * 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);

2979
	/*
J
Johannes Berg 已提交
2980 2981
	 * Start timer to probe the connection to the AP now.
	 * Also start the timer that will detect beacon loss.
2982
	 */
J
Johannes Berg 已提交
2983
	ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2984
	ieee80211_sta_reset_beacon_monitor(sdata);
2985

2986 2987 2988 2989
	ret = true;
 out:
	kfree(bss_ies);
	return ret;
2990 2991
}

2992 2993 2994
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
2995 2996 2997 2998 2999
{
	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;
3000
	int ac, uapsd_queues = -1;
J
Johannes Berg 已提交
3001 3002
	u8 *pos;
	bool reassoc;
3003
	struct cfg80211_bss *bss;
J
Johannes Berg 已提交
3004

3005
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3006 3007

	if (!assoc_data)
3008
		return;
3009
	if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3010
		return;
J
Johannes Berg 已提交
3011 3012 3013 3014 3015 3016 3017

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

	if (len < 24 + 6)
3018
		return;
J
Johannes Berg 已提交
3019 3020 3021 3022 3023 3024

	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
3025 3026 3027 3028
	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
3029 3030

	pos = mgmt->u.assoc_resp.variable;
3031
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
3032 3033

	if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3034 3035
	    elems.timeout_int &&
	    elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
J
Johannes Berg 已提交
3036
		u32 tu, ms;
3037
		tu = le32_to_cpu(elems.timeout_int->value);
J
Johannes Berg 已提交
3038
		ms = tu * 1024 / 1000;
J
Johannes Berg 已提交
3039 3040 3041
		sdata_info(sdata,
			   "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
			   mgmt->sa, tu, ms);
J
Johannes Berg 已提交
3042
		assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3043
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
3044
		if (ms > IEEE80211_ASSOC_TIMEOUT)
3045 3046
			run_again(sdata, assoc_data->timeout);
		return;
J
Johannes Berg 已提交
3047 3048
	}

3049
	bss = assoc_data->bss;
J
Johannes Berg 已提交
3050 3051

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
3052 3053
		sdata_info(sdata, "%pM denied association (code=%d)\n",
			   mgmt->sa, status_code);
J
Johannes Berg 已提交
3054 3055
		ieee80211_destroy_assoc_data(sdata, false);
	} else {
3056
		if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
J
Johannes Berg 已提交
3057
			/* oops -- internal error -- send timeout for now */
3058
			ieee80211_destroy_assoc_data(sdata, false);
3059
			cfg80211_assoc_timeout(sdata->dev, bss);
3060
			return;
J
Johannes Berg 已提交
3061
		}
3062
		sdata_info(sdata, "associated\n");
3063 3064 3065 3066 3067 3068 3069

		/*
		 * 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);
3070 3071 3072 3073 3074 3075

		/* get uapsd queues configuration */
		uapsd_queues = 0;
		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
			if (sdata->tx_conf[ac].uapsd)
				uapsd_queues |= BIT(ac);
J
Johannes Berg 已提交
3076 3077
	}

3078
	cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
J
Johannes Berg 已提交
3079
}
J
Johannes Berg 已提交
3080

3081
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
3082
				  struct ieee80211_mgmt *mgmt, size_t len,
3083
				  struct ieee80211_rx_status *rx_status,
3084
				  struct ieee802_11_elems *elems)
3085 3086
{
	struct ieee80211_local *local = sdata->local;
3087
	struct ieee80211_bss *bss;
3088
	struct ieee80211_channel *channel;
3089

3090
	sdata_assert_lock(sdata);
3091

3092 3093
	channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
	if (!channel)
3094 3095 3096
		return;

	bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3097
					channel);
3098 3099
	if (bss) {
		sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3100
		ieee80211_rx_bss_put(local, bss);
3101
	}
3102 3103 3104
}


3105
static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
3106
					 struct sk_buff *skb)
3107
{
J
Johannes Berg 已提交
3108
	struct ieee80211_mgmt *mgmt = (void *)skb->data;
3109
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
3110 3111
	struct ieee80211_rx_status *rx_status = (void *) skb->cb;
	size_t baselen, len = skb->len;
3112 3113
	struct ieee802_11_elems elems;

3114 3115
	ifmgd = &sdata->u.mgd;

3116
	sdata_assert_lock(sdata);
3117

3118
	if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3119 3120
		return; /* ignore ProbeResp to foreign address */

3121 3122 3123 3124 3125
	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
	if (baselen > len)
		return;

	ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3126
			       false, &elems);
3127

3128
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3129

3130
	if (ifmgd->associated &&
3131
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3132
		ieee80211_reset_ap_probe(sdata);
J
Johannes Berg 已提交
3133 3134

	if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
3135
	    ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
J
Johannes Berg 已提交
3136
		/* got probe response, continue with auth */
J
Johannes Berg 已提交
3137
		sdata_info(sdata, "direct probe responded\n");
J
Johannes Berg 已提交
3138 3139
		ifmgd->auth_data->tries = 0;
		ifmgd->auth_data->timeout = jiffies;
3140
		ifmgd->auth_data->timeout_started = true;
3141
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
3142
	}
3143 3144
}

3145 3146 3147
/*
 * This is the canonical list of information elements we care about,
 * the filter code also gives us all changes to the Microsoft OUI
3148 3149 3150
 * (00:50:F2) vendor IE which is used for WMM which we need to track,
 * as well as the DTPC IE (part of the Cisco OUI) used for signaling
 * changes to requested client power.
3151 3152 3153 3154 3155 3156 3157 3158 3159 3160
 *
 * 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 =
3161 3162 3163 3164 3165
	(1ULL << WLAN_EID_COUNTRY) |
	(1ULL << WLAN_EID_ERP_INFO) |
	(1ULL << WLAN_EID_CHANNEL_SWITCH) |
	(1ULL << WLAN_EID_PWR_CONSTRAINT) |
	(1ULL << WLAN_EID_HT_CAPABILITY) |
3166
	(1ULL << WLAN_EID_HT_OPERATION);
3167

3168 3169 3170
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)
3171
{
3172
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3173
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3174 3175
	size_t baselen;
	struct ieee802_11_elems elems;
3176
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
3177 3178
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
3179
	struct sta_info *sta;
3180
	u32 changed = 0;
3181
	bool erp_valid;
J
Johannes Berg 已提交
3182
	u8 erp_value = 0;
3183
	u32 ncrc;
3184
	u8 *bssid;
3185
	u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3186

3187
	sdata_assert_lock(sdata);
3188

3189 3190 3191
	/* Process beacon from the current BSS */
	baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
	if (baselen > len)
3192
		return;
3193

J
Johannes Berg 已提交
3194 3195 3196 3197
	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		rcu_read_unlock();
3198
		return;
J
Johannes Berg 已提交
3199 3200
	}

3201
	if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
J
Johannes Berg 已提交
3202
		rcu_read_unlock();
3203
		return;
J
Johannes Berg 已提交
3204
	}
3205
	chan = chanctx_conf->def.chan;
J
Johannes Berg 已提交
3206
	rcu_read_unlock();
3207

3208
	if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3209
	    ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
J
Johannes Berg 已提交
3210
		ieee802_11_parse_elems(mgmt->u.beacon.variable,
3211
				       len - baselen, false, &elems);
3212

3213
		ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3214 3215 3216 3217
		if (elems.tim && !elems.parse_error) {
			const struct ieee80211_tim_ie *tim_ie = elems.tim;
			ifmgd->dtim_period = tim_ie->dtim_period;
		}
3218
		ifmgd->have_beacon = true;
3219
		ifmgd->assoc_data->need_beacon = false;
3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230
		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
3231 3232
		/* continue assoc process */
		ifmgd->assoc_data->timeout = jiffies;
3233
		ifmgd->assoc_data->timeout_started = true;
3234 3235
		run_again(sdata, ifmgd->assoc_data->timeout);
		return;
J
Johannes Berg 已提交
3236
	}
3237

J
Johannes Berg 已提交
3238
	if (!ifmgd->associated ||
3239
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3240
		return;
J
Johannes Berg 已提交
3241
	bssid = ifmgd->associated->bssid;
3242

3243 3244 3245 3246
	/* 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;
3247
		ifmgd->ave_beacon_signal = rx_status->signal * 16;
3248
		ifmgd->last_cqm_event_signal = 0;
3249
		ifmgd->count_beacon_signal = 1;
3250
		ifmgd->last_ave_beacon_signal = 0;
3251 3252 3253 3254 3255
	} else {
		ifmgd->ave_beacon_signal =
			(IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
			 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
			 ifmgd->ave_beacon_signal) / 16;
3256
		ifmgd->count_beacon_signal++;
3257
	}
3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270

	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;
3271
			drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
3272 3273 3274 3275
		} else if (sig < ifmgd->rssi_min_thold &&
			   (last_sig >= ifmgd->rssi_max_thold ||
			   last_sig == 0)) {
			ifmgd->last_ave_beacon_signal = sig;
3276
			drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
3277 3278 3279
		}
	}

3280
	if (bss_conf->cqm_rssi_thold &&
3281
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3282
	    !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303
		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);
		}
	}

3304
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
J
Johannes Berg 已提交
3305
		mlme_dbg_ratelimited(sdata,
3306
				     "cancelling AP probe due to a received beacon\n");
3307
		ieee80211_reset_ap_probe(sdata);
3308 3309
	}

J
Johannes Berg 已提交
3310 3311 3312 3313
	/*
	 * Push the beacon loss detection into the future since
	 * we are processing a beacon from the AP just now.
	 */
3314
	ieee80211_sta_reset_beacon_monitor(sdata);
J
Johannes Berg 已提交
3315

3316 3317
	ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
	ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3318
					  len - baselen, false, &elems,
3319 3320
					  care_about_ies, ncrc);

3321
	if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3322 3323 3324
		bool directed_tim = ieee80211_check_tim(elems.tim,
							elems.tim_len,
							ifmgd->aid);
3325
		if (directed_tim) {
3326
			if (local->hw.conf.dynamic_ps_timeout > 0) {
3327 3328 3329 3330 3331
				if (local->hw.conf.flags & IEEE80211_CONF_PS) {
					local->hw.conf.flags &= ~IEEE80211_CONF_PS;
					ieee80211_hw_config(local,
							    IEEE80211_CONF_CHANGE_PS);
				}
3332
				ieee80211_send_nullfunc(local, sdata, 0);
3333
			} else if (!local->pspolling && sdata->u.mgd.powersave) {
3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345
				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);
			}
3346 3347
		}
	}
J
Johannes Berg 已提交
3348

3349
	if (sdata->vif.p2p) {
J
Janusz Dziedzic 已提交
3350
		struct ieee80211_p2p_noa_attr noa = {};
3351 3352 3353 3354 3355
		int ret;

		ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
					    len - baselen,
					    IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3356
					    (u8 *) &noa, sizeof(noa));
J
Janusz Dziedzic 已提交
3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372
		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));
3373 3374 3375 3376 3377
			changed |= BSS_CHANGED_P2P_PS;
			ifmgd->beacon_crc_valid = false;
		}
	}

3378 3379 3380
	if (ifmgd->csa_waiting_bcn)
		ieee80211_chswitch_post_beacon(sdata);

3381
	if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3382
		return;
3383
	ifmgd->beacon_crc = ncrc;
3384
	ifmgd->beacon_crc_valid = true;
3385

3386
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3387

3388
	ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3389
					 rx_status->device_timestamp,
3390 3391
					 &elems, true);

3392 3393
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
	    ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3394 3395 3396
				     elems.wmm_param_len))
		changed |= BSS_CHANGED_QOS;

3397 3398
	/*
	 * If we haven't had a beacon before, tell the driver about the
3399
	 * DTIM period (and beacon timing if desired) now.
3400
	 */
3401
	if (!ifmgd->have_beacon) {
3402 3403 3404 3405 3406
		/* 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;
3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419

		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;
		}

3420 3421
		changed |= BSS_CHANGED_BEACON_INFO;
		ifmgd->have_beacon = true;
3422 3423 3424 3425 3426

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

3427
		ieee80211_recalc_ps_vif(sdata);
3428 3429
	}

3430
	if (elems.erp_info) {
J
Johannes Berg 已提交
3431 3432 3433 3434
		erp_valid = true;
		erp_value = elems.erp_info[0];
	} else {
		erp_valid = false;
3435
	}
J
Johannes Berg 已提交
3436 3437 3438
	changed |= ieee80211_handle_bss_capability(sdata,
			le16_to_cpu(mgmt->u.beacon.capab_info),
			erp_valid, erp_value);
3439

3440
	mutex_lock(&local->sta_mtx);
3441 3442
	sta = sta_info_get(sdata, bssid);

3443 3444
	if (ieee80211_config_bw(sdata, sta,
				elems.ht_cap_elem, elems.ht_operation,
3445 3446 3447 3448 3449
				elems.vht_operation, bssid, &changed)) {
		mutex_unlock(&local->sta_mtx);
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_DEAUTH_LEAVING,
				       true, deauth_buf);
3450 3451
		cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
				      sizeof(deauth_buf));
3452
		return;
3453
	}
3454 3455 3456 3457

	if (sta && elems.opmode_notif)
		ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
					    rx_status->band, true);
3458
	mutex_unlock(&local->sta_mtx);
3459

3460 3461 3462
	changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
					       elems.country_elem,
					       elems.country_elem_len,
3463 3464
					       elems.pwr_constr_elem,
					       elems.cisco_dtpc_elem);
3465

3466
	ieee80211_bss_info_change_notify(sdata, changed);
3467 3468
}

3469 3470
void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
				  struct sk_buff *skb)
3471 3472 3473 3474
{
	struct ieee80211_rx_status *rx_status;
	struct ieee80211_mgmt *mgmt;
	u16 fc;
3475 3476
	struct ieee802_11_elems elems;
	int ies_len;
3477 3478 3479 3480 3481

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

3482
	sdata_lock(sdata);
3483

J
Johannes Berg 已提交
3484 3485
	switch (fc & IEEE80211_FCTL_STYPE) {
	case IEEE80211_STYPE_BEACON:
3486
		ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
J
Johannes Berg 已提交
3487 3488 3489 3490 3491
		break;
	case IEEE80211_STYPE_PROBE_RESP:
		ieee80211_rx_mgmt_probe_resp(sdata, skb);
		break;
	case IEEE80211_STYPE_AUTH:
3492
		ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3493 3494
		break;
	case IEEE80211_STYPE_DEAUTH:
3495
		ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3496 3497
		break;
	case IEEE80211_STYPE_DISASSOC:
3498
		ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3499 3500 3501
		break;
	case IEEE80211_STYPE_ASSOC_RESP:
	case IEEE80211_STYPE_REASSOC_RESP:
3502
		ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3503 3504
		break;
	case IEEE80211_STYPE_ACTION:
3505
		if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3506 3507 3508
			ies_len = skb->len -
				  offsetof(struct ieee80211_mgmt,
					   u.action.u.chan_switch.variable);
3509 3510 3511 3512 3513 3514

			if (ies_len < 0)
				break;

			ieee802_11_parse_elems(
				mgmt->u.action.u.chan_switch.variable,
3515
				ies_len, true, &elems);
3516 3517 3518 3519

			if (elems.parse_error)
				break;

3520
			ieee80211_sta_process_chanswitch(sdata,
3521 3522 3523
						 rx_status->mactime,
						 rx_status->device_timestamp,
						 &elems, false);
3524 3525 3526 3527 3528 3529 3530 3531 3532 3533
		} 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,
3534
				ies_len, true, &elems);
3535 3536 3537 3538 3539 3540 3541 3542

			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
3543
			ieee80211_sta_process_chanswitch(sdata,
3544 3545 3546
						 rx_status->mactime,
						 rx_status->device_timestamp,
						 &elems, false);
3547
		}
3548
		break;
3549
	}
3550
	sdata_unlock(sdata);
3551 3552
}

J
Johannes Berg 已提交
3553
static void ieee80211_sta_timer(unsigned long data)
3554
{
J
Johannes Berg 已提交
3555 3556
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
3557

3558
	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3559 3560
}

3561
static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3562
					  u8 *bssid, u8 reason, bool tx)
3563
{
3564
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3565

3566
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3567
			       tx, frame_buf);
3568

3569 3570
	cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
			      IEEE80211_DEAUTH_FRAME_LEN);
3571 3572
}

J
Johannes Berg 已提交
3573 3574 3575 3576 3577
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;
3578
	u32 tx_flags = 0;
J
Johannes Berg 已提交
3579

3580
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3581 3582 3583 3584 3585 3586 3587

	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
3588 3589
		sdata_info(sdata, "authentication with %pM timed out\n",
			   auth_data->bss->bssid);
J
Johannes Berg 已提交
3590 3591 3592 3593 3594 3595 3596 3597 3598 3599

		/*
		 * 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
3600 3601
	drv_mgd_prepare_tx(local, sdata);

J
Johannes Berg 已提交
3602
	if (auth_data->bss->proberesp_ies) {
3603 3604 3605
		u16 trans = 1;
		u16 status = 0;

J
Johannes Berg 已提交
3606 3607 3608
		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
3609 3610

		auth_data->expected_transaction = 2;
3611 3612 3613 3614 3615 3616 3617

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

3618 3619 3620 3621
		if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
			tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
				   IEEE80211_TX_INTFL_MLME_CONN_TX;

3622 3623
		ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
				    auth_data->data, auth_data->data_len,
J
Johannes Berg 已提交
3624
				    auth_data->bss->bssid,
3625 3626
				    auth_data->bss->bssid, NULL, 0, 0,
				    tx_flags);
J
Johannes Berg 已提交
3627 3628 3629
	} else {
		const u8 *ssidie;

J
Johannes Berg 已提交
3630 3631 3632
		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
3633

3634
		rcu_read_lock();
J
Johannes Berg 已提交
3635
		ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3636 3637
		if (!ssidie) {
			rcu_read_unlock();
J
Johannes Berg 已提交
3638
			return -EINVAL;
3639
		}
J
Johannes Berg 已提交
3640 3641 3642 3643 3644
		/*
		 * 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],
3645
					 NULL, 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
3646
					 auth_data->bss->channel, false);
3647
		rcu_read_unlock();
J
Johannes Berg 已提交
3648 3649
	}

3650
	if (tx_flags == 0) {
3651
		auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3652
		auth_data->timeout_started = true;
3653
		run_again(sdata, auth_data->timeout);
3654
	} else {
3655 3656 3657 3658
		auth_data->timeout =
			round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
		auth_data->timeout_started = true;
		run_again(sdata, auth_data->timeout);
3659
	}
J
Johannes Berg 已提交
3660 3661 3662 3663 3664 3665 3666 3667 3668

	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;

3669
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3670 3671 3672

	assoc_data->tries++;
	if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
J
Johannes Berg 已提交
3673 3674
		sdata_info(sdata, "association with %pM timed out\n",
			   assoc_data->bss->bssid);
J
Johannes Berg 已提交
3675 3676 3677 3678 3679 3680 3681 3682 3683 3684

		/*
		 * 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
3685 3686 3687
	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
3688 3689
	ieee80211_send_assoc(sdata);

3690 3691
	if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
		assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3692
		assoc_data->timeout_started = true;
3693
		run_again(sdata, assoc_data->timeout);
3694
	} else {
3695 3696 3697 3698 3699
		assoc_data->timeout =
			round_jiffies_up(jiffies +
					 IEEE80211_ASSOC_TIMEOUT_LONG);
		assoc_data->timeout_started = true;
		run_again(sdata, assoc_data->timeout);
3700
	}
J
Johannes Berg 已提交
3701 3702 3703 3704

	return 0;
}

3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716
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);
}

3717
void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
3718 3719
{
	struct ieee80211_local *local = sdata->local;
3720
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3721

3722
	sdata_lock(sdata);
3723

3724 3725 3726 3727 3728 3729 3730 3731 3732 3733
	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;
3734
				run_again(sdata, ifmgd->auth_data->timeout);
3735 3736 3737
			} else {
				ifmgd->auth_data->timeout = jiffies - 1;
			}
3738
			ifmgd->auth_data->timeout_started = true;
3739 3740 3741 3742 3743 3744
		} 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;
3745
				run_again(sdata, ifmgd->assoc_data->timeout);
3746 3747 3748
			} else {
				ifmgd->assoc_data->timeout = jiffies - 1;
			}
3749
			ifmgd->assoc_data->timeout_started = true;
3750 3751 3752
		}
	}

3753
	if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
J
Johannes Berg 已提交
3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767
	    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);

3768
			cfg80211_auth_timeout(sdata->dev, bssid);
J
Johannes Berg 已提交
3769
		}
3770
	} else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3771
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
3772

3773
	if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
J
Johannes Berg 已提交
3774
	    time_after(jiffies, ifmgd->assoc_data->timeout)) {
3775
		if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
J
Johannes Berg 已提交
3776
		    ieee80211_do_assoc(sdata)) {
3777
			struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
J
Johannes Berg 已提交
3778 3779

			ieee80211_destroy_assoc_data(sdata, false);
3780
			cfg80211_assoc_timeout(sdata->dev, bss);
J
Johannes Berg 已提交
3781
		}
3782
	} else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3783
		run_again(sdata, ifmgd->assoc_data->timeout);
J
Johannes Berg 已提交
3784

3785
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
J
Johannes Berg 已提交
3786
	    ifmgd->associated) {
3787
		u8 bssid[ETH_ALEN];
3788
		int max_tries;
3789

3790
		memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3791

3792
		if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3793
			max_tries = max_nullfunc_tries;
3794
		else
3795
			max_tries = max_probe_tries;
3796

3797 3798 3799
		/* ACK received for nullfunc probing frame */
		if (!ifmgd->probe_send_count)
			ieee80211_reset_ap_probe(sdata);
3800 3801
		else if (ifmgd->nullfunc_failed) {
			if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3802 3803 3804 3805
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
					 bssid, ifmgd->probe_send_count,
					 max_tries);
3806 3807
				ieee80211_mgd_probe_ap_send(sdata);
			} else {
J
Johannes Berg 已提交
3808 3809 3810
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
					 bssid);
3811
				ieee80211_sta_connection_lost(sdata, bssid,
3812 3813
					WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
					false);
3814 3815
			}
		} else if (time_is_after_jiffies(ifmgd->probe_timeout))
3816
			run_again(sdata, ifmgd->probe_timeout);
3817
		else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
J
Johannes Berg 已提交
3818 3819 3820
			mlme_dbg(sdata,
				 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
				 bssid, probe_wait_ms);
3821
			ieee80211_sta_connection_lost(sdata, bssid,
3822
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3823
		} else if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3824 3825 3826 3827
			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);
3828 3829
			ieee80211_mgd_probe_ap_send(sdata);
		} else {
J
Johannes Berg 已提交
3830 3831 3832 3833
			/*
			 * We actually lost the connection ... or did we?
			 * Let's make sure!
			 */
3834 3835 3836 3837
			wiphy_debug(local->hw.wiphy,
				    "%s: No probe response from AP %pM"
				    " after %dms, disconnecting.\n",
				    sdata->name,
3838
				    bssid, probe_wait_ms);
3839

3840
			ieee80211_sta_connection_lost(sdata, bssid,
3841
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
J
Johannes Berg 已提交
3842 3843 3844
		}
	}

3845
	sdata_unlock(sdata);
3846 3847
}

J
Johannes Berg 已提交
3848 3849 3850 3851 3852
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;
3853
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3854 3855 3856 3857

	if (local->quiescing)
		return;

3858
	if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
M
Michal Kazior 已提交
3859 3860
		return;

3861
	sdata->u.mgd.connection_loss = false;
3862 3863
	ieee80211_queue_work(&sdata->local->hw,
			     &sdata->u.mgd.beacon_connection_loss_work);
J
Johannes Berg 已提交
3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875
}

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;

3876
	if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
M
Michal Kazior 已提交
3877 3878
		return;

3879
	ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
J
Johannes Berg 已提交
3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890
}

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
3891 3892
static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
3893 3894
	u32 flags;

3895
	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3896
		__ieee80211_stop_poll(sdata);
3897

J
Johannes Berg 已提交
3898
		/* let's probe the connection once */
3899 3900 3901 3902
		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
3903
		/* and do all the other regular work too */
J
Johannes Berg 已提交
3904
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3905
	}
J
Johannes Berg 已提交
3906
}
3907

3908
#ifdef CONFIG_PM
3909 3910 3911 3912 3913 3914 3915
void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

	sdata_lock(sdata);

3916 3917 3918 3919 3920
	if (ifmgd->auth_data || ifmgd->assoc_data) {
		const u8 *bssid = ifmgd->auth_data ?
				ifmgd->auth_data->bss->bssid :
				ifmgd->assoc_data->bss->bssid;

3921
		/*
3922 3923 3924
		 * If we are trying to authenticate / associate while suspending,
		 * cfg80211 won't know and won't actually abort those attempts,
		 * thus we need to do that ourselves.
3925
		 */
3926
		ieee80211_send_deauth_disassoc(sdata, bssid,
3927 3928 3929
					       IEEE80211_STYPE_DEAUTH,
					       WLAN_REASON_DEAUTH_LEAVING,
					       false, frame_buf);
3930 3931 3932 3933
		if (ifmgd->assoc_data)
			ieee80211_destroy_assoc_data(sdata, false);
		if (ifmgd->auth_data)
			ieee80211_destroy_auth_data(sdata, false);
3934 3935 3936 3937 3938 3939 3940
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
	}

	sdata_unlock(sdata);
}

3941 3942 3943 3944
void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

3945
	sdata_lock(sdata);
3946
	if (!ifmgd->associated) {
3947
		sdata_unlock(sdata);
3948 3949 3950 3951 3952 3953 3954 3955 3956 3957
		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);
3958
		sdata_unlock(sdata);
3959 3960
		return;
	}
3961
	sdata_unlock(sdata);
3962 3963 3964
}
#endif

J
Johannes Berg 已提交
3965 3966
/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3967
{
3968
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
3969

3970
	ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3971
	INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3972
	INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3973 3974
	INIT_WORK(&ifmgd->beacon_connection_loss_work,
		  ieee80211_beacon_connection_loss_work);
3975 3976
	INIT_WORK(&ifmgd->csa_connection_drop_work,
		  ieee80211_csa_connection_drop_work);
3977
	INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
3978 3979
	INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
			  ieee80211_tdls_peer_del_work);
3980
	setup_timer(&ifmgd->timer, ieee80211_sta_timer,
S
Sujith 已提交
3981
		    (unsigned long) sdata);
J
Johannes Berg 已提交
3982 3983 3984 3985
	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);
3986
	setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
J
Johannes Berg 已提交
3987
		    (unsigned long) sdata);
3988 3989
	INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
			  ieee80211_sta_handle_tspec_ac_params_wk);
J
Johannes Berg 已提交
3990

3991
	ifmgd->flags = 0;
3992
	ifmgd->powersave = sdata->wdev.ps;
3993 3994
	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
3995
	ifmgd->p2p_noa_index = -1;
J
Johannes Berg 已提交
3996

3997
	if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
3998 3999 4000
		ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
	else
		ifmgd->req_smps = IEEE80211_SMPS_OFF;
4001 4002
}

4003 4004
/* scan finished notification */
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
J
Johannes Berg 已提交
4005
{
4006
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
4007

4008 4009
	/* Restart STA timers */
	rcu_read_lock();
4010 4011 4012 4013
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (ieee80211_sdata_running(sdata))
			ieee80211_restart_sta_timer(sdata);
	}
4014 4015
	rcu_read_unlock();
}
J
Johannes Berg 已提交
4016

4017 4018 4019 4020 4021 4022 4023
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);
4024

4025 4026 4027
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, latency_usec);
	mutex_unlock(&local->iflist_mtx);
4028

4029
	return NOTIFY_OK;
J
Johannes Berg 已提交
4030 4031
}

J
Johannes Berg 已提交
4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043
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;

4044
	ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
J
Johannes Berg 已提交
4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056
	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;

4057
	vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
J
Johannes Berg 已提交
4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075
	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;
}

4076 4077
static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
				  struct cfg80211_bss *cbss)
4078 4079 4080
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4081
	const struct ieee80211_ht_cap *ht_cap = NULL;
4082
	const struct ieee80211_ht_operation *ht_oper = NULL;
J
Johannes Berg 已提交
4083
	const struct ieee80211_vht_operation *vht_oper = NULL;
4084
	struct ieee80211_supported_band *sband;
4085
	struct cfg80211_chan_def chandef;
J
Johannes Berg 已提交
4086
	int ret;
4087

4088 4089
	sband = local->hw.wiphy->bands[cbss->channel->band];

J
Johannes Berg 已提交
4090 4091 4092 4093
	ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
			  IEEE80211_STA_DISABLE_80P80MHZ |
			  IEEE80211_STA_DISABLE_160MHZ);

4094 4095
	rcu_read_lock();

J
Johannes Berg 已提交
4096 4097
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	    sband->ht_cap.ht_supported) {
4098
		const u8 *ht_oper_ie, *ht_cap_ie;
4099

4100
		ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4101 4102
		if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
			ht_oper = (void *)(ht_oper_ie + 2);
4103

4104 4105 4106 4107 4108
		ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
		if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
			ht_cap = (void *)(ht_cap_ie + 2);

		if (!ht_cap) {
4109 4110 4111
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ht_oper = NULL;
		}
4112 4113
	}

J
Johannes Berg 已提交
4114 4115
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    sband->vht_cap.vht_supported) {
4116
		const u8 *vht_oper_ie, *vht_cap;
J
Johannes Berg 已提交
4117

4118 4119
		vht_oper_ie = ieee80211_bss_get_ie(cbss,
						   WLAN_EID_VHT_OPERATION);
J
Johannes Berg 已提交
4120 4121 4122 4123
		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
4124
			sdata_info(sdata,
J
Johannes Berg 已提交
4125
				   "AP advertised VHT without HT, disabling both\n");
4126 4127
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4128
		}
4129 4130 4131 4132 4133 4134

		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;
		}
4135 4136
	}

J
Johannes Berg 已提交
4137 4138
	ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
						     cbss->channel,
4139
						     ht_cap, ht_oper, vht_oper,
4140
						     &chandef, false);
4141

J
Johannes Berg 已提交
4142 4143
	sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
				      local->rx_chains);
4144

4145 4146
	rcu_read_unlock();

4147 4148 4149
	/* will change later if needed */
	sdata->smps_mode = IEEE80211_SMPS_OFF;

4150
	mutex_lock(&local->mtx);
J
Johannes Berg 已提交
4151 4152 4153 4154 4155 4156 4157
	/*
	 * 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);
4158 4159 4160 4161

	/* don't downgrade for 5 and 10 MHz channels, though. */
	if (chandef.width == NL80211_CHAN_WIDTH_5 ||
	    chandef.width == NL80211_CHAN_WIDTH_10)
4162
		goto out;
4163

4164
	while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4165
		ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4166 4167 4168
		ret = ieee80211_vif_use_channel(sdata, &chandef,
						IEEE80211_CHANCTX_SHARED);
	}
4169 4170
 out:
	mutex_unlock(&local->mtx);
J
Johannes Berg 已提交
4171
	return ret;
4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197
}

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
4198
	if (new_sta) {
4199 4200 4201
		u32 rates = 0, basic_rates = 0;
		bool have_higher_than_11mbit;
		int min_rate = INT_MAX, min_rate_index = -1;
4202
		struct ieee80211_chanctx_conf *chanctx_conf;
4203
		struct ieee80211_supported_band *sband;
J
Johannes Berg 已提交
4204
		const struct cfg80211_bss_ies *ies;
4205 4206
		int shift;
		u32 rate_flags;
4207 4208 4209 4210 4211 4212

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

		err = ieee80211_prep_channel(sdata, cbss);
		if (err) {
			sta_info_free(local, new_sta);
4213
			return -EINVAL;
4214
		}
4215 4216 4217 4218 4219 4220
		shift = ieee80211_vif_get_shift(&sdata->vif);

		rcu_read_lock();
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (WARN_ON(!chanctx_conf)) {
			rcu_read_unlock();
E
Eytan Lifshitz 已提交
4221
			sta_info_free(local, new_sta);
4222 4223 4224 4225
			return -EINVAL;
		}
		rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
		rcu_read_unlock();
4226 4227 4228 4229 4230

		ieee80211_get_rates(sband, bss->supp_rates,
				    bss->supp_rates_len,
				    &rates, &basic_rates,
				    &have_higher_than_11mbit,
4231 4232
				    &min_rate, &min_rate_index,
				    shift, rate_flags);
4233 4234 4235 4236 4237 4238 4239 4240 4241 4242

		/*
		 * 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
4243 4244
			sdata_info(sdata,
				   "No basic rates, using min rate instead\n");
4245 4246 4247
			basic_rates = BIT(min_rate_index);
		}

J
Johannes Berg 已提交
4248
		new_sta->sta.supp_rates[cbss->channel->band] = rates;
4249 4250 4251
		sdata->vif.bss_conf.basic_rates = basic_rates;

		/* cf. IEEE 802.11 9.2.12 */
J
Johannes Berg 已提交
4252
		if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4253 4254 4255 4256 4257 4258 4259
		    have_higher_than_11mbit)
			sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
		else
			sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

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

4260 4261
		/* set timing information */
		sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
J
Johannes Berg 已提交
4262
		rcu_read_lock();
4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288
		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
4289
		rcu_read_unlock();
4290 4291

		/* tell driver about BSSID, basic rates and timing */
4292
		ieee80211_bss_info_change_notify(sdata,
4293 4294
			BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
			BSS_CHANGED_BEACON_INT);
4295 4296

		if (assoc)
J
Johannes Berg 已提交
4297
			sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4298

J
Johannes Berg 已提交
4299 4300
		err = sta_info_insert(new_sta);
		new_sta = NULL;
4301
		if (err) {
J
Johannes Berg 已提交
4302 4303 4304
			sdata_info(sdata,
				   "failed to insert STA entry for the AP (error %d)\n",
				   err);
4305 4306 4307
			return err;
		}
	} else
4308
		WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4309 4310 4311 4312

	return 0;
}

4313 4314 4315
/* config hooks */
int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
		       struct cfg80211_auth_request *req)
J
Johannes Berg 已提交
4316
{
J
Johannes Berg 已提交
4317 4318 4319
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data;
4320
	u16 auth_alg;
J
Johannes Berg 已提交
4321 4322 4323
	int err;

	/* prepare auth data structure */
J
Johannes Berg 已提交
4324

4325 4326 4327 4328 4329
	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
4330
		if (IS_ERR(local->wep_tx_tfm))
4331
			return -EOPNOTSUPP;
4332 4333 4334 4335 4336 4337 4338 4339
		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;
4340 4341 4342
	case NL80211_AUTHTYPE_SAE:
		auth_alg = WLAN_AUTH_SAE;
		break;
4343 4344
	default:
		return -EOPNOTSUPP;
J
Johannes Berg 已提交
4345
	}
4346

4347 4348
	auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
			    req->ie_len, GFP_KERNEL);
J
Johannes Berg 已提交
4349
	if (!auth_data)
J
Johannes Berg 已提交
4350
		return -ENOMEM;
4351

J
Johannes Berg 已提交
4352
	auth_data->bss = req->bss;
4353

4354 4355 4356 4357 4358 4359 4360 4361 4362
	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;
	}

4363
	if (req->ie && req->ie_len) {
4364 4365 4366
		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
4367
	}
4368

J
Johannes Berg 已提交
4369
	if (req->key && req->key_len) {
J
Johannes Berg 已提交
4370 4371 4372
		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
4373 4374
	}

J
Johannes Berg 已提交
4375
	auth_data->algorithm = auth_alg;
J
Johannes Berg 已提交
4376

J
Johannes Berg 已提交
4377
	/* try to authenticate/probe */
4378

J
Johannes Berg 已提交
4379 4380 4381 4382
	if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
	    ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
4383 4384
	}

J
Johannes Berg 已提交
4385 4386
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
4387

J
Johannes Berg 已提交
4388 4389
	/* prep auth_data so we don't go into idle on disassoc */
	ifmgd->auth_data = auth_data;
J
Johannes Berg 已提交
4390

4391 4392 4393 4394 4395 4396 4397
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

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

4398 4399
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      sizeof(frame_buf));
4400
	}
J
Johannes Berg 已提交
4401

J
Johannes Berg 已提交
4402
	sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4403

4404 4405
	err = ieee80211_prep_connection(sdata, req->bss, false);
	if (err)
J
Johannes Berg 已提交
4406
		goto err_clear;
J
Johannes Berg 已提交
4407

J
Johannes Berg 已提交
4408 4409 4410 4411 4412 4413 4414
	err = ieee80211_probe_auth(sdata);
	if (err) {
		sta_info_destroy_addr(sdata, req->bss->bssid);
		goto err_clear;
	}

	/* hold our own reference */
4415
	cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4416
	return 0;
J
Johannes Berg 已提交
4417 4418

 err_clear:
4419 4420
	memset(ifmgd->bssid, 0, ETH_ALEN);
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4421 4422 4423 4424
	ifmgd->auth_data = NULL;
 err_free:
	kfree(auth_data);
	return err;
J
Johannes Berg 已提交
4425 4426
}

4427 4428 4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464
static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
					const u8 *wmm_param, int len)
{
	const u8 *pos;
	size_t left;

	if (len < 8)
		return false;

	if (wmm_param[5] != 1 /* version */)
		return false;

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

	for (; left >= 4; left -= 4, pos += 4) {
		u8 aifsn = pos[0] & 0x0f;
		u8 ecwmin = pos[1] & 0x0f;
		u8 ecwmax = (pos[1] & 0xf0) >> 4;
		int aci = (pos[0] >> 5) & 0x03;

		if (aifsn < 2) {
			sdata_info(sdata,
				   "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
				   aifsn, aci);
			return false;
		}
		if (ecwmin > ecwmax) {
			sdata_info(sdata,
				   "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
				   ecwmin, ecwmax, aci);
			return false;
		}
	}

	return true;
}

4465 4466
int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
			struct cfg80211_assoc_request *req)
4467
{
J
Johannes Berg 已提交
4468
	struct ieee80211_local *local = sdata->local;
4469
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4470
	struct ieee80211_bss *bss = (void *)req->bss->priv;
J
Johannes Berg 已提交
4471
	struct ieee80211_mgd_assoc_data *assoc_data;
4472
	const struct cfg80211_bss_ies *beacon_ies;
J
Johannes Berg 已提交
4473
	struct ieee80211_supported_band *sband;
4474
	const u8 *ssidie, *ht_ie, *vht_ie;
4475
	int i, err;
4476

J
Johannes Berg 已提交
4477 4478 4479 4480
	assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
	if (!assoc_data)
		return -ENOMEM;

4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491
	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();

4492 4493 4494 4495 4496 4497 4498
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

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

4499 4500
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      sizeof(frame_buf));
4501
	}
J
Johannes Berg 已提交
4502 4503 4504 4505

	if (ifmgd->auth_data && !ifmgd->auth_data->done) {
		err = -EBUSY;
		goto err_free;
J
Johannes Berg 已提交
4506
	}
4507

J
Johannes Berg 已提交
4508 4509 4510 4511
	if (ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
	}
4512

J
Johannes Berg 已提交
4513 4514 4515 4516
	if (ifmgd->auth_data) {
		bool match;

		/* keep sta info, bssid if matching */
4517
		match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
J
Johannes Berg 已提交
4518
		ieee80211_destroy_auth_data(sdata, match);
4519 4520
	}

J
Johannes Berg 已提交
4521
	/* prepare assoc data */
4522

4523 4524
	ifmgd->beacon_crc_valid = false;

4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560
	assoc_data->wmm = bss->wmm_used &&
			  (local->hw.queues >= IEEE80211_NUM_ACS);
	if (assoc_data->wmm) {
		/* try to check validity of WMM params IE */
		const struct cfg80211_bss_ies *ies;
		const u8 *wp, *start, *end;

		rcu_read_lock();
		ies = rcu_dereference(req->bss->ies);
		start = ies->data;
		end = start + ies->len;

		while (true) {
			wp = cfg80211_find_vendor_ie(
				WLAN_OUI_MICROSOFT,
				WLAN_OUI_TYPE_MICROSOFT_WMM,
				start, end - start);
			if (!wp)
				break;
			start = wp + wp[1] + 2;
			/* if this IE is too short, try the next */
			if (wp[1] <= 4)
				continue;
			/* if this IE is WMM params, we found what we wanted */
			if (wp[6] == 1)
				break;
		}

		if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
							wp[1] - 2)) {
			assoc_data->wmm = false;
			ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
		}
		rcu_read_unlock();
	}

J
Johannes Berg 已提交
4561 4562 4563 4564 4565 4566 4567
	/*
	 * 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.
	 */
4568
	for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4569 4570
		if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4571
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4572
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4573
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4574
			netdev_info(sdata->dev,
4575
				    "disabling HT/VHT due to WEP/TKIP use\n");
4576 4577
		}
	}
4578

4579
	if (req->flags & ASSOC_REQ_DISABLE_HT) {
4580
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4581 4582
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
	}
B
Ben Greear 已提交
4583

4584 4585 4586
	if (req->flags & ASSOC_REQ_DISABLE_VHT)
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;

J
Johannes Berg 已提交
4587 4588 4589
	/* 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 ||
4590 4591
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4592
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4593 4594
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4595 4596
			netdev_info(sdata->dev,
				    "disabling HT as WMM/QoS is not supported by the AP\n");
4597
	}
J
Johannes Berg 已提交
4598

4599 4600
	/* disable VHT if we don't support it or the AP doesn't use WMM */
	if (!sband->vht_cap.vht_supported ||
4601 4602
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4603
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4604 4605
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4606 4607
			netdev_info(sdata->dev,
				    "disabling VHT as WMM/QoS is not supported by the AP\n");
4608 4609
	}

B
Ben Greear 已提交
4610 4611 4612 4613
	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));

4614 4615 4616 4617
	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));

4618
	if (req->ie && req->ie_len) {
J
Johannes Berg 已提交
4619 4620 4621
		memcpy(assoc_data->ie, req->ie, req->ie_len);
		assoc_data->ie_len = req->ie_len;
	}
4622

J
Johannes Berg 已提交
4623
	assoc_data->bss = req->bss;
4624

J
Johannes Berg 已提交
4625 4626
	if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
		if (ifmgd->powersave)
4627
			sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
J
Johannes Berg 已提交
4628
		else
4629
			sdata->smps_mode = IEEE80211_SMPS_OFF;
J
Johannes Berg 已提交
4630
	} else
4631
		sdata->smps_mode = ifmgd->req_smps;
J
Johannes Berg 已提交
4632

J
Johannes Berg 已提交
4633 4634 4635
	assoc_data->capability = req->bss->capability;
	assoc_data->supp_rates = bss->supp_rates;
	assoc_data->supp_rates_len = bss->supp_rates_len;
4636

4637
	rcu_read_lock();
4638 4639 4640 4641 4642
	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
4643
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4644 4645 4646 4647 4648 4649
	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;
4650
	rcu_read_unlock();
4651

K
Kalle Valo 已提交
4652
	if (bss->wmm_used && bss->uapsd_supported &&
4653
	    (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
4654
		assoc_data->uapsd = true;
K
Kalle Valo 已提交
4655 4656
		ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
	} else {
4657
		assoc_data->uapsd = false;
K
Kalle Valo 已提交
4658 4659 4660
		ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
	}

4661
	if (req->prev_bssid)
J
Johannes Berg 已提交
4662
		memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4663 4664 4665 4666 4667 4668 4669 4670 4671

	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;
	}

4672 4673 4674 4675 4676
	if (req->flags & ASSOC_REQ_USE_RRM)
		ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
	else
		ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;

4677 4678 4679 4680 4681
	if (req->crypto.control_port)
		ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
	else
		ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;

4682 4683
	sdata->control_port_protocol = req->crypto.control_port_ethertype;
	sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4684 4685
	sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
							sdata->vif.type);
4686

J
Johannes Berg 已提交
4687 4688 4689
	/* kick off associate process */

	ifmgd->assoc_data = assoc_data;
4690
	ifmgd->dtim_period = 0;
4691
	ifmgd->have_beacon = false;
J
Johannes Berg 已提交
4692

4693 4694 4695
	err = ieee80211_prep_connection(sdata, req->bss, true);
	if (err)
		goto err_clear;
J
Johannes Berg 已提交
4696

4697 4698
	rcu_read_lock();
	beacon_ies = rcu_dereference(req->bss->beacon_ies);
4699

4700 4701 4702 4703 4704 4705 4706 4707 4708
	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);
4709
		assoc_data->timeout_started = true;
4710 4711 4712 4713 4714
		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);
4715 4716
		u8 dtim_count = 0;

4717 4718 4719 4720
		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;
4721
			dtim_count = tim->dtim_count;
4722
		}
4723
		ifmgd->have_beacon = true;
J
Johannes Berg 已提交
4724
		assoc_data->timeout = jiffies;
4725
		assoc_data->timeout_started = true;
4726 4727 4728 4729 4730 4731 4732

		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;
		}
4733 4734
	} else {
		assoc_data->timeout = jiffies;
4735
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
4736
	}
4737 4738
	rcu_read_unlock();

4739
	run_again(sdata, assoc_data->timeout);
J
Johannes Berg 已提交
4740

P
Paul Stewart 已提交
4741 4742 4743 4744 4745 4746 4747 4748 4749 4750
	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
4751 4752
		sdata_info(sdata, "associating with AP with corrupt %s\n",
			   corrupt_type);
P
Paul Stewart 已提交
4753 4754
	}

4755
	return 0;
J
Johannes Berg 已提交
4756
 err_clear:
4757 4758
	memset(ifmgd->bssid, 0, ETH_ALEN);
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4759 4760 4761 4762
	ifmgd->assoc_data = NULL;
 err_free:
	kfree(assoc_data);
	return err;
4763 4764
}

4765
int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4766
			 struct cfg80211_deauth_request *req)
4767
{
4768
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4769
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4770
	bool tx = !req->local_state_change;
4771

4772 4773 4774 4775 4776 4777
	if (ifmgd->auth_data &&
	    ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
		sdata_info(sdata,
			   "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
			   req->bssid, req->reason_code,
			   ieee80211_get_reason_code_string(req->reason_code));
4778

4779
		drv_mgd_prepare_tx(sdata->local, sdata);
4780 4781
		ieee80211_send_deauth_disassoc(sdata, req->bssid,
					       IEEE80211_STYPE_DEAUTH,
4782
					       req->reason_code, tx,
4783
					       frame_buf);
4784
		ieee80211_destroy_auth_data(sdata, false);
4785 4786
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
4787

4788
		return 0;
4789 4790
	}

4791 4792
	if (ifmgd->associated &&
	    ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4793 4794 4795 4796 4797
		sdata_info(sdata,
			   "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
			   req->bssid, req->reason_code,
			   ieee80211_get_reason_code_string(req->reason_code));

4798 4799
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       req->reason_code, tx, frame_buf);
4800 4801
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
4802 4803
		return 0;
	}
4804

4805
	return -ENOTCONN;
4806
}
4807

4808
int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4809
			   struct cfg80211_disassoc_request *req)
J
Johannes Berg 已提交
4810
{
4811
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4812
	u8 bssid[ETH_ALEN];
4813
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
J
Johannes Berg 已提交
4814

J
Johannes Berg 已提交
4815 4816 4817 4818 4819 4820
	/*
	 * 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.
	 */
4821
	if (ifmgd->associated != req->bss)
4822 4823
		return -ENOLINK;

J
Johannes Berg 已提交
4824
	sdata_info(sdata,
4825 4826
		   "disassociating from %pM by local choice (Reason: %u=%s)\n",
		   req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4827

4828
	memcpy(bssid, req->bss->bssid, ETH_ALEN);
4829 4830 4831
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
			       req->reason_code, !req->local_state_change,
			       frame_buf);
4832

4833 4834
	cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
			      IEEE80211_DEAUTH_FRAME_LEN);
4835

4836 4837
	return 0;
}
4838

4839
void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4840 4841 4842
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

4843 4844 4845 4846 4847 4848 4849 4850 4851 4852
	/*
	 * 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);
4853
	cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4854

4855
	sdata_lock(sdata);
4856 4857
	if (ifmgd->assoc_data) {
		struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4858
		ieee80211_destroy_assoc_data(sdata, false);
4859 4860
		cfg80211_assoc_timeout(sdata->dev, bss);
	}
4861 4862 4863
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
	del_timer_sync(&ifmgd->timer);
4864
	sdata_unlock(sdata);
4865 4866
}

4867 4868 4869 4870 4871 4872
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
4873 4874
	trace_api_cqm_rssi_notify(sdata, rssi_event);

4875 4876 4877
	cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
}
EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);