mlme.c 138.4 KB
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/*
 * BSS client mode implementation
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 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
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 * Copyright 2004, Instant802 Networks, Inc.
 * Copyright 2005, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
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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) {
555 556 557 558 559 560
		u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;

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

	if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
		cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
565
		cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
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	}

568 569 570 571 572 573 574 575
	/*
	 * 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;

576 577 578 579 580 581 582 583 584 585
	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;
	}

586
	/* reserve and fill IE */
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	pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
588 589 590
	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;
600
	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;
605
	u32 rate_flags, rates = 0;
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606

607
	sdata_assert_lock(sdata);
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608

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	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (WARN_ON(!chanctx_conf)) {
		rcu_read_unlock();
		return;
	}
615
	chan = chanctx_conf->def.chan;
616
	rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
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	rcu_read_unlock();
	sband = local->hw.wiphy->bands[chan->band];
619
	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)...
		 */
628 629 630 631
		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.
		 */
638 639 640 641 642 643 644 645
		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;

680 681 682
	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) {
725 726 727
			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) {
740 741 742 743
				int rate;
				rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
						    5 * (1 << shift));
				*pos++ = (u8) rate;
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			}
		}
	}

748 749
	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 */
754 755
		 /* max tx power */
		*pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
756
	}
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758
	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 */
771
	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,
782 783
			WLAN_EID_FAST_BSS_TRANSITION,	/* reassoc only */
			WLAN_EID_RIC_DATA,		/* reassoc only */
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			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
		};
786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805
		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;

815
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
816
		ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
817
				    sband, chan, sdata->smps_mode);
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819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838
	/* 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,
		};
839 840

		/* RIC already taken above, so no need to handle here anymore */
841 842 843 844 845 846 847 848
		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;
	}

849
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
850 851
		ieee80211_add_vht_ie(sdata, skb, sband,
				     &assoc_data->ap_vht_cap);
852

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	/* if present, add any custom non-vendor IEs that go after HT */
854
	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;
	}

863 864
	if (assoc_data->wmm) {
		if (assoc_data->uapsd) {
865 866
			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;
		}

872
		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 */
876
	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;
885 886 887
	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);
}

891 892 893 894 895 896
void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_pspoll *pspoll;
	struct sk_buff *skb;

897 898
	skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
	if (!skb)
899 900
		return;

901 902
	pspoll = (struct ieee80211_pspoll *) skb->data;
	pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
903

904 905
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
906 907
}

908 909 910 911 912
void ieee80211_send_nullfunc(struct ieee80211_local *local,
			     struct ieee80211_sub_if_data *sdata,
			     int powersave)
{
	struct sk_buff *skb;
913
	struct ieee80211_hdr_3addr *nullfunc;
914
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
915

916 917
	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
	if (!skb)
918 919
		return;

920
	nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
921
	if (powersave)
922
		nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
923

924 925
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
					IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
926 927 928 929

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

930
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
931 932
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;

933
	ieee80211_tx_skb(sdata, skb);
934 935
}

936 937 938 939 940 941 942 943 944 945 946
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);
947
	if (!skb)
948
		return;
949

950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965
	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);
}

966 967 968 969 970
/* 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);
971
	struct ieee80211_local *local = sdata->local;
972
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
973
	int ret;
974

975
	if (!ieee80211_sdata_running(sdata))
976 977
		return;

978
	sdata_lock(sdata);
979 980 981
	mutex_lock(&local->mtx);
	mutex_lock(&local->chanctx_mtx);

982 983
	if (!ifmgd->associated)
		goto out;
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 1015 1016 1017 1018
	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)) {
1019
		sdata_info(sdata,
1020
			   "failed to finalize channel switch, disconnecting\n");
1021 1022 1023 1024
		ieee80211_queue_work(&sdata->local->hw,
				     &ifmgd->csa_connection_drop_work);
		goto out;
	}
1025

1026
	/* XXX: shouldn't really modify cfg80211-owned data! */
1027
	ifmgd->associated->channel = sdata->csa_chandef.chan;
1028

1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
	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);
1049

1050 1051 1052 1053 1054
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
1055

1056 1057
	cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);

1058 1059 1060
	sdata->vif.csa_active = false;
	ifmgd->csa_waiting_bcn = false;

1061 1062 1063 1064 1065 1066
	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);
1067
		return;
1068
	}
1069 1070
}

1071 1072
void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
{
J
Johannes Berg 已提交
1073 1074
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1075 1076 1077

	trace_api_chswitch_done(sdata, success);
	if (!success) {
1078 1079 1080 1081 1082 1083
		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);
1084 1085 1086 1087
	}
}
EXPORT_SYMBOL(ieee80211_chswitch_done);

1088 1089 1090 1091
static void ieee80211_chswitch_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
1092

1093
	ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1094 1095
}

1096
static void
J
Johannes Berg 已提交
1097
ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1098 1099
				 u64 timestamp, u32 device_timestamp,
				 struct ieee802_11_elems *elems,
1100
				 bool beacon)
1101
{
1102
	struct ieee80211_local *local = sdata->local;
1103
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1104
	struct cfg80211_bss *cbss = ifmgd->associated;
1105
	struct ieee80211_chanctx_conf *conf;
J
Johannes Berg 已提交
1106
	struct ieee80211_chanctx *chanctx;
1107
	enum ieee80211_band current_band;
1108
	struct ieee80211_csa_ie csa_ie;
1109
	struct ieee80211_channel_switch ch_switch;
1110
	int res;
1111

1112
	sdata_assert_lock(sdata);
1113

1114
	if (!cbss)
1115 1116
		return;

1117
	if (local->scanning)
1118 1119
		return;

1120
	/* disregard subsequent announcements if we are already processing */
1121
	if (sdata->vif.csa_active)
1122 1123
		return;

1124
	current_band = cbss->channel->band;
1125
	memset(&csa_ie, 0, sizeof(csa_ie));
1126
	res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1127
					   ifmgd->flags,
1128
					   ifmgd->associated->bssid, &csa_ie);
1129
	if (res	< 0)
1130
		ieee80211_queue_work(&local->hw,
1131
				     &ifmgd->csa_connection_drop_work);
1132
	if (res)
1133
		return;
1134

1135
	if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1136 1137 1138
				     IEEE80211_CHAN_DISABLED)) {
		sdata_info(sdata,
			   "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1139
			   ifmgd->associated->bssid,
1140 1141 1142
			   csa_ie.chandef.chan->center_freq,
			   csa_ie.chandef.width, csa_ie.chandef.center_freq1,
			   csa_ie.chandef.center_freq2);
1143 1144 1145 1146 1147
		ieee80211_queue_work(&local->hw,
				     &ifmgd->csa_connection_drop_work);
		return;
	}

1148
	mutex_lock(&local->mtx);
1149
	mutex_lock(&local->chanctx_mtx);
1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163
	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);

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

1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190
	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;
	}

1191 1192 1193
	res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
					    chanctx->mode, false);
	if (res) {
J
Johannes Berg 已提交
1194
		sdata_info(sdata,
1195 1196
			   "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
			   res);
1197
		ieee80211_queue_work(&local->hw,
J
Johannes Berg 已提交
1198
				     &ifmgd->csa_connection_drop_work);
1199
		mutex_unlock(&local->chanctx_mtx);
1200
		mutex_unlock(&local->mtx);
J
Johannes Berg 已提交
1201 1202
		return;
	}
1203
	mutex_unlock(&local->chanctx_mtx);
J
Johannes Berg 已提交
1204

1205
	sdata->vif.csa_active = true;
1206
	sdata->csa_chandef = csa_ie.chandef;
1207
	sdata->csa_block_tx = csa_ie.mode;
J
Johannes Berg 已提交
1208

1209
	if (sdata->csa_block_tx)
1210 1211
		ieee80211_stop_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
1212
	mutex_unlock(&local->mtx);
1213

1214 1215 1216
	cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
					  csa_ie.count);

1217
	if (local->ops->channel_switch) {
1218
		/* use driver's channel switch callback */
1219
		drv_channel_switch(local, sdata, &ch_switch);
1220 1221 1222 1223
		return;
	}

	/* channel switch handled in software */
1224
	if (csa_ie.count <= 1)
1225
		ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1226
	else
1227
		mod_timer(&ifmgd->chswitch_timer,
1228 1229
			  TU_TO_EXP_TIME((csa_ie.count - 1) *
					 cbss->beacon_interval));
1230 1231
}

1232 1233 1234 1235 1236 1237
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)
1238
{
1239 1240
	struct ieee80211_country_ie_triplet *triplet;
	int chan = ieee80211_frequency_to_channel(channel->center_freq);
1241
	int i, chan_increment;
1242
	bool have_chan_pwr = false;
1243

1244 1245
	/* Invalid IE */
	if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1246
		return false;
1247

1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261
	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;
1262
	}
1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273

	/* 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;
1274
				*chan_pwr = triplet->chans.max_power;
1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285
				break;
			}
		}
		if (have_chan_pwr)
			break;

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

1286 1287 1288 1289 1290
	if (have_chan_pwr)
		*pwr_reduction = *pwr_constr_elem;
	return have_chan_pwr;
}

1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304
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];
}

1305 1306 1307 1308
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,
1309 1310
				       const u8 *pwr_constr_ie,
				       const u8 *cisco_dtpc_ie)
1311
{
1312 1313 1314
	bool has_80211h_pwr = false, has_cisco_pwr = false;
	int chan_pwr = 0, pwr_reduction_80211h = 0;
	int pwr_level_cisco, pwr_level_80211h;
1315
	int new_ap_level;
1316

1317 1318 1319 1320 1321 1322
	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);
1323 1324 1325 1326 1327 1328 1329 1330
		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;
1331
	}
1332

1333
	if (!has_80211h_pwr && !has_cisco_pwr)
1334
		return 0;
1335

1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351
	/* 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;
	}
1352

1353 1354
	if (sdata->ap_power_level == new_ap_level)
		return 0;
1355

1356 1357 1358 1359
	sdata->ap_power_level = new_ap_level;
	if (__ieee80211_recalc_txpower(sdata))
		return BSS_CHANGED_TXPOWER;
	return 0;
1360 1361
}

1362 1363 1364 1365 1366 1367
/* 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
1368 1369 1370 1371
	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
1372
	if (local->scanning)
J
Johannes Berg 已提交
1373 1374
		return;

1375 1376 1377 1378 1379 1380 1381
	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);
1382

1383 1384 1385 1386 1387 1388
		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);
1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405
	}
}

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);
	}
}

1406 1407 1408 1409
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
1410
	bool authorized = false;
1411 1412 1413 1414

	if (!mgd->powersave)
		return false;

1415 1416 1417
	if (mgd->broken_ap)
		return false;

1418 1419 1420
	if (!mgd->associated)
		return false;

1421
	if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1422 1423
		return false;

1424
	if (!mgd->have_beacon)
1425 1426
		return false;

1427 1428 1429
	rcu_read_lock();
	sta = sta_info_get(sdata, mgd->bssid);
	if (sta)
J
Johannes Berg 已提交
1430
		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1431 1432
	rcu_read_unlock();

J
Johannes Berg 已提交
1433
	return authorized;
1434 1435
}

1436
/* need to hold RTNL or interface lock */
1437
void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1438 1439 1440
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;
1441
	int timeout;
1442 1443 1444 1445 1446 1447 1448

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

	list_for_each_entry(sdata, &local->interfaces, list) {
1449
		if (!ieee80211_sdata_running(sdata))
1450
			continue;
1451 1452 1453 1454 1455 1456 1457 1458
		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;
		}
1459 1460 1461 1462 1463 1464
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

1465
	if (count == 1 && ieee80211_powersave_allowed(found)) {
1466 1467 1468
		s32 beaconint_us;

		if (latency < 0)
M
Mark Gross 已提交
1469
			latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1470 1471 1472 1473

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

1474
		timeout = local->dynamic_ps_forced_timeout;
1475 1476
		if (timeout < 0) {
			/*
1477 1478
			 * Go to full PSM if the user configures a very low
			 * latency requirement.
1479 1480 1481
			 * The 2000 second value is there for compatibility
			 * until the PM_QOS_NETWORK_LATENCY is configured
			 * with real values.
1482
			 */
1483 1484
			if (latency > (1900 * USEC_PER_MSEC) &&
			    latency != (2000 * USEC_PER_SEC))
1485
				timeout = 0;
1486 1487
			else
				timeout = 100;
1488
		}
1489
		local->hw.conf.dynamic_ps_timeout = timeout;
1490

1491
		if (beaconint_us > latency) {
1492
			local->ps_sdata = NULL;
1493 1494
		} else {
			int maxslp = 1;
1495
			u8 dtimper = found->u.mgd.dtim_period;
1496 1497 1498 1499 1500

			/* If the TIM IE is invalid, pretend the value is 1 */
			if (!dtimper)
				dtimper = 1;
			else if (dtimper > 1)
1501 1502 1503
				maxslp = min_t(int, dtimper,
						    latency / beaconint_us);

1504
			local->hw.conf.max_sleep_period = maxslp;
1505
			local->hw.conf.ps_dtim_period = dtimper;
1506
			local->ps_sdata = found;
1507
		}
1508
	} else {
1509
		local->ps_sdata = NULL;
1510
	}
1511 1512 1513 1514

	ieee80211_change_ps(local);
}

E
Eliad Peller 已提交
1515 1516 1517 1518 1519 1520 1521 1522 1523 1524
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);
	}
}

1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536
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,
1537
					IEEE80211_MAX_QUEUE_MAP,
1538 1539
					IEEE80211_QUEUE_STOP_REASON_PS,
					false);
1540 1541 1542 1543 1544 1545 1546 1547
}

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;
1548
	struct ieee80211_if_managed *ifmgd;
1549 1550
	unsigned long flags;
	int q;
1551 1552 1553 1554 1555

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

1556 1557
	ifmgd = &sdata->u.mgd;

1558 1559 1560
	if (local->hw.conf.flags & IEEE80211_CONF_PS)
		return;

1561
	if (local->hw.conf.dynamic_ps_timeout > 0) {
1562 1563
		/* don't enter PS if TX frames are pending */
		if (drv_tx_frames_pending(local)) {
1564 1565 1566 1567 1568
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
			return;
		}
1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586

		/*
		 * 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);
1587 1588
	}

1589
	if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1590
	    !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1591
		if (drv_tx_frames_pending(local)) {
1592 1593 1594
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
1595
		} else {
1596 1597
			ieee80211_send_nullfunc(local, sdata, 1);
			/* Flush to get the tx status of nullfunc frame */
1598
			ieee80211_flush_queues(local, sdata);
1599
		}
1600 1601
	}

1602 1603
	if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
	      (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1604 1605 1606 1607 1608
	    (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);
	}
1609 1610 1611 1612 1613 1614
}

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

1615
	if (local->quiescing || local->suspended)
1616 1617
		return;

1618
	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1619 1620
}

1621 1622 1623 1624 1625 1626 1627
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);
1628
	struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1629

1630 1631 1632 1633 1634 1635 1636 1637
	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);
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 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728
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
1729
/* MLME */
1730
static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1731
				     struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
1732
				     const u8 *wmm_param, size_t wmm_param_len)
1733 1734
{
	struct ieee80211_tx_queue_params params;
1735
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1736 1737
	size_t left;
	int count;
J
Johannes Berg 已提交
1738 1739
	const u8 *pos;
	u8 uapsd_queues = 0;
1740

1741
	if (!local->ops->conf_tx)
1742
		return false;
1743

J
Johannes Berg 已提交
1744
	if (local->hw.queues < IEEE80211_NUM_ACS)
1745
		return false;
1746 1747

	if (!wmm_param)
1748
		return false;
1749

1750
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1751
		return false;
K
Kalle Valo 已提交
1752 1753

	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1754
		uapsd_queues = ifmgd->uapsd_queues;
K
Kalle Valo 已提交
1755

1756
	count = wmm_param[6] & 0x0f;
1757
	if (count == ifmgd->wmm_last_param_set)
1758
		return false;
1759
	ifmgd->wmm_last_param_set = count;
1760 1761 1762 1763 1764 1765

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

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

Y
Yoni Divinsky 已提交
1766
	sdata->wmm_acm = 0;
1767 1768 1769
	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
1770
		bool uapsd = false;
1771 1772 1773
		int queue;

		switch (aci) {
1774
		case 1: /* AC_BK */
J
Johannes Berg 已提交
1775
			queue = 3;
J
Johannes Berg 已提交
1776
			if (acm)
Y
Yoni Divinsky 已提交
1777
				sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
K
Kalle Valo 已提交
1778 1779
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
				uapsd = true;
1780
			break;
1781
		case 2: /* AC_VI */
J
Johannes Berg 已提交
1782
			queue = 1;
J
Johannes Berg 已提交
1783
			if (acm)
Y
Yoni Divinsky 已提交
1784
				sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
K
Kalle Valo 已提交
1785 1786
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
				uapsd = true;
1787
			break;
1788
		case 3: /* AC_VO */
J
Johannes Berg 已提交
1789
			queue = 0;
J
Johannes Berg 已提交
1790
			if (acm)
Y
Yoni Divinsky 已提交
1791
				sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
K
Kalle Valo 已提交
1792 1793
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
				uapsd = true;
1794
			break;
1795
		case 0: /* AC_BE */
1796
		default:
J
Johannes Berg 已提交
1797
			queue = 2;
J
Johannes Berg 已提交
1798
			if (acm)
Y
Yoni Divinsky 已提交
1799
				sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
K
Kalle Valo 已提交
1800 1801
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
				uapsd = true;
1802 1803 1804 1805 1806 1807
			break;
		}

		params.aifs = pos[0] & 0x0f;
		params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params.cw_min = ecw2cw(pos[1] & 0x0f);
1808
		params.txop = get_unaligned_le16(pos + 2);
1809
		params.acm = acm;
K
Kalle Valo 已提交
1810 1811
		params.uapsd = uapsd;

J
Johannes Berg 已提交
1812
		mlme_dbg(sdata,
1813
			 "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
1814 1815
			 queue, aci, acm,
			 params.aifs, params.cw_min, params.cw_max,
1816 1817
			 params.txop, params.uapsd,
			 ifmgd->tx_tspec[queue].downgraded);
1818
		sdata->tx_conf[queue] = params;
1819 1820
		if (!ifmgd->tx_tspec[queue].downgraded &&
		    drv_conf_tx(local, sdata, queue, &params))
J
Johannes Berg 已提交
1821 1822 1823
			sdata_err(sdata,
				  "failed to set TX queue parameters for queue %d\n",
				  queue);
1824
	}
1825 1826

	/* enable WMM or activate new settings */
1827
	sdata->vif.bss_conf.qos = true;
1828
	return true;
1829 1830
}

1831 1832 1833 1834
static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
{
	lockdep_assert_held(&sdata->local->mtx);

1835
	sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1836 1837 1838 1839 1840 1841 1842 1843 1844 1845
	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
1846 1847
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
1848
{
J
Johannes Berg 已提交
1849
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1850
	u32 changed = 0;
J
Johannes Berg 已提交
1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863
	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
1864
	if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1865
		use_short_slot = true;
1866

1867 1868 1869
	if (use_protection != bss_conf->use_cts_prot) {
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
1870
	}
1871

1872 1873
	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
1874
		changed |= BSS_CHANGED_ERP_PREAMBLE;
1875
	}
1876

J
Johannes Berg 已提交
1877 1878 1879
	if (use_short_slot != bss_conf->use_short_slot) {
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
1880 1881 1882 1883 1884
	}

	return changed;
}

1885
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1886
				     struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
1887
				     u32 bss_info_changed)
1888
{
1889
	struct ieee80211_bss *bss = (void *)cbss->priv;
1890
	struct ieee80211_local *local = sdata->local;
1891
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1892

J
Johannes Berg 已提交
1893
	bss_info_changed |= BSS_CHANGED_ASSOC;
1894
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1895
		bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1896

1897
	sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1898
		beacon_loss_count * bss_conf->beacon_int));
1899

1900 1901
	sdata->u.mgd.associated = cbss;
	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1902

1903 1904
	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;

1905
	if (sdata->vif.p2p) {
1906
		const struct cfg80211_bss_ies *ies;
1907

1908 1909 1910 1911 1912 1913 1914 1915
		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
1916 1917
					(u8 *) &bss_conf->p2p_noa_attr,
					sizeof(bss_conf->p2p_noa_attr));
1918
			if (ret >= 2) {
J
Janusz Dziedzic 已提交
1919 1920
				sdata->u.mgd.p2p_noa_index =
					bss_conf->p2p_noa_attr.index;
1921 1922
				bss_info_changed |= BSS_CHANGED_P2P_PS;
			}
1923
		}
1924
		rcu_read_unlock();
1925 1926
	}

J
Johannes Berg 已提交
1927
	/* just to be sure */
1928
	ieee80211_stop_poll(sdata);
J
Johannes Berg 已提交
1929

1930
	ieee80211_led_assoc(local, 1);
1931

1932
	if (sdata->u.mgd.have_beacon) {
1933 1934 1935 1936 1937 1938 1939
		/*
		 * 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;
1940
		bss_conf->beacon_rate = bss->beacon_rate;
1941
		bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1942
	} else {
1943
		bss_conf->beacon_rate = NULL;
1944
		bss_conf->dtim_period = 0;
1945
	}
1946

1947
	bss_conf->assoc = 1;
1948

1949
	/* Tell the driver to monitor connection quality (if supported) */
1950
	if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1951
	    bss_conf->cqm_rssi_thold)
1952 1953
		bss_info_changed |= BSS_CHANGED_CQM;

1954
	/* Enable ARP filtering */
1955
	if (bss_conf->arp_addr_cnt)
1956 1957
		bss_info_changed |= BSS_CHANGED_ARP_FILTER;

J
Johannes Berg 已提交
1958
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1959

J
Johannes Berg 已提交
1960 1961 1962
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
	mutex_unlock(&local->iflist_mtx);
1963

1964
	ieee80211_recalc_smps(sdata);
E
Eliad Peller 已提交
1965 1966
	ieee80211_recalc_ps_vif(sdata);

1967
	netif_carrier_on(sdata->dev);
1968 1969
}

1970
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1971 1972
				   u16 stype, u16 reason, bool tx,
				   u8 *frame_buf)
1973
{
1974
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1975
	struct ieee80211_local *local = sdata->local;
1976
	u32 changed = 0;
1977

1978
	sdata_assert_lock(sdata);
1979

1980 1981 1982
	if (WARN_ON_ONCE(tx && !frame_buf))
		return;

J
Johannes Berg 已提交
1983 1984 1985
	if (WARN_ON(!ifmgd->associated))
		return;

1986 1987
	ieee80211_stop_poll(sdata);

1988
	ifmgd->associated = NULL;
1989 1990
	netif_carrier_off(sdata->dev);

1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001
	/*
	 * 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
2002 2003 2004
	/* disable per-vif ps */
	ieee80211_recalc_ps_vif(sdata);

2005 2006
	/* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
	if (tx)
2007
		ieee80211_flush_queues(local, sdata);
2008

2009 2010
	/* deauthenticate/disassociate now */
	if (tx || frame_buf)
2011 2012
		ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
					       reason, tx, frame_buf);
2013 2014 2015

	/* flush out frame */
	if (tx)
2016
		ieee80211_flush_queues(local, sdata);
2017

2018 2019 2020
	/* clear bssid only after building the needed mgmt frames */
	memset(ifmgd->bssid, 0, ETH_ALEN);

2021
	/* remove AP and TDLS peers */
2022
	sta_info_flush(sdata);
2023 2024

	/* finally reset all BSS / config parameters */
2025 2026 2027
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
J
Johannes Berg 已提交
2028 2029
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
2030

J
Janusz Dziedzic 已提交
2031 2032 2033
	ifmgd->p2p_noa_index = -1;
	memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
	       sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2034

2035
	/* on the next assoc, re-program HT/VHT parameters */
B
Ben Greear 已提交
2036 2037
	memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
	memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2038 2039
	memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
	memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2040

2041
	sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2042

2043 2044 2045
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

2046
	/* Disable ARP filtering */
2047
	if (sdata->vif.bss_conf.arp_addr_cnt)
2048 2049
		changed |= BSS_CHANGED_ARP_FILTER;

2050 2051 2052
	sdata->vif.bss_conf.qos = false;
	changed |= BSS_CHANGED_QOS;

2053 2054
	/* The BSSID (not really interesting) and HT changed */
	changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
J
Johannes Berg 已提交
2055
	ieee80211_bss_info_change_notify(sdata, changed);
2056

2057 2058 2059
	/* disassociated - set to defaults now */
	ieee80211_set_wmm_default(sdata, false);

2060 2061 2062 2063
	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);
2064

2065
	sdata->vif.bss_conf.dtim_period = 0;
2066 2067
	sdata->vif.bss_conf.beacon_rate = NULL;

2068
	ifmgd->have_beacon = false;
2069

2070
	ifmgd->flags = 0;
2071
	mutex_lock(&local->mtx);
2072
	ieee80211_vif_release_channel(sdata);
2073 2074

	sdata->vif.csa_active = false;
2075
	ifmgd->csa_waiting_bcn = false;
2076 2077 2078 2079 2080
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
2081
	mutex_unlock(&local->mtx);
2082

2083 2084 2085 2086
	/* existing TX TSPEC sessions no longer exist */
	memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
	cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);

2087
	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2088
}
2089

2090 2091 2092 2093 2094 2095 2096 2097
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
2098 2099
	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
2100
	 */
J
Johannes Berg 已提交
2101 2102 2103
	if (is_multicast_ether_addr(hdr->addr1))
		return;

2104
	ieee80211_sta_reset_conn_monitor(sdata);
2105
}
2106

2107 2108 2109
static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2110
	struct ieee80211_local *local = sdata->local;
2111

2112
	mutex_lock(&local->mtx);
2113 2114
	if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
		goto out;
2115

2116
	__ieee80211_stop_poll(sdata);
2117 2118 2119 2120

	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
	mutex_unlock(&local->iflist_mtx);
2121 2122

	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
2123
		goto out;
2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134

	/*
	 * 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));
2135 2136
out:
	mutex_unlock(&local->mtx);
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 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173
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);
	}
}

2174
void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2175
			     struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2176
{
2177 2178
	ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);

F
Felix Fietkau 已提交
2179
	if (!ieee80211_is_data(hdr->frame_control))
2180 2181 2182 2183
	    return;

	if (ieee80211_is_nullfunc(hdr->frame_control) &&
	    sdata->u.mgd.probe_send_count > 0) {
2184
		if (ack)
2185
			ieee80211_sta_reset_conn_monitor(sdata);
2186 2187
		else
			sdata->u.mgd.nullfunc_failed = true;
2188
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2189
		return;
2190
	}
2191 2192 2193

	if (ack)
		ieee80211_sta_reset_conn_monitor(sdata);
2194 2195
}

2196 2197 2198 2199
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ssid;
2200
	u8 *dst = ifmgd->associated->bssid;
2201
	u8 unicast_limit = max(1, max_probe_tries - 3);
2202 2203 2204 2205 2206 2207 2208 2209

	/*
	 * 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;
2210

2211 2212 2213 2214 2215 2216 2217
	/*
	 * 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.
	 */
2218 2219
	ifmgd->probe_send_count++;

2220 2221
	if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
		ifmgd->nullfunc_failed = false;
2222
		ieee80211_send_nullfunc(sdata->local, sdata, 0);
2223
	} else {
2224 2225
		int ssid_len;

2226
		rcu_read_lock();
2227
		ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2228 2229 2230 2231 2232
		if (WARN_ON_ONCE(ssid == NULL))
			ssid_len = 0;
		else
			ssid_len = ssid[1];

2233 2234
		ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL,
					 ssid + 2, ssid_len, NULL,
2235
					 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
2236
					 ifmgd->associated->channel, false);
2237
		rcu_read_unlock();
2238
	}
2239

2240
	ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2241
	run_again(sdata, ifmgd->probe_timeout);
2242 2243
}

J
Johannes Berg 已提交
2244 2245
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
				   bool beacon)
2246 2247
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
2248
	bool already = false;
2249

2250
	if (!ieee80211_sdata_running(sdata))
2251 2252
		return;

2253
	sdata_lock(sdata);
2254 2255 2256 2257

	if (!ifmgd->associated)
		goto out;

2258 2259 2260 2261 2262 2263 2264
	mutex_lock(&sdata->local->mtx);

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

2265
	if (beacon) {
J
Johannes Berg 已提交
2266
		mlme_dbg_ratelimited(sdata,
2267 2268
				     "detected beacon loss from AP (missed %d beacons) - probing\n",
				     beacon_loss_count);
J
Johannes Berg 已提交
2269

2270
		ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2271
	}
2272

J
Johannes Berg 已提交
2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283
	/*
	 * 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!
	 */
2284
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
J
Johannes Berg 已提交
2285 2286
		already = true;

E
Eliad Peller 已提交
2287 2288
	ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;

2289 2290
	mutex_unlock(&sdata->local->mtx);

J
Johannes Berg 已提交
2291 2292 2293
	if (already)
		goto out;

2294 2295 2296 2297
	mutex_lock(&sdata->local->iflist_mtx);
	ieee80211_recalc_ps(sdata->local, -1);
	mutex_unlock(&sdata->local->iflist_mtx);

2298 2299
	ifmgd->probe_send_count = 0;
	ieee80211_mgd_probe_ap_send(sdata);
2300
 out:
2301
	sdata_unlock(sdata);
2302 2303
}

2304 2305 2306 2307 2308
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;
2309
	struct cfg80211_bss *cbss;
2310 2311
	struct sk_buff *skb;
	const u8 *ssid;
2312
	int ssid_len;
2313 2314 2315 2316

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

2317
	sdata_assert_lock(sdata);
2318

2319 2320 2321 2322 2323 2324 2325
	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
2326 2327
		return NULL;

2328
	rcu_read_lock();
2329
	ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2330 2331 2332 2333 2334
	if (WARN_ON_ONCE(ssid == NULL))
		ssid_len = 0;
	else
		ssid_len = ssid[1];

2335
	skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
J
Johannes Berg 已提交
2336
					(u32) -1, cbss->channel,
2337
					ssid + 2, ssid_len,
2338
					NULL, 0, true);
2339
	rcu_read_unlock();
2340 2341 2342 2343 2344

	return skb;
}
EXPORT_SYMBOL(ieee80211_ap_probereq_get);

2345
static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2346
{
2347
	struct ieee80211_local *local = sdata->local;
2348
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2349
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2350

2351
	sdata_lock(sdata);
2352
	if (!ifmgd->associated) {
2353
		sdata_unlock(sdata);
2354 2355 2356
		return;
	}

2357 2358
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
			       WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2359
			       true, frame_buf);
2360
	mutex_lock(&local->mtx);
2361
	sdata->vif.csa_active = false;
2362
	ifmgd->csa_waiting_bcn = false;
2363 2364 2365 2366 2367
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
2368
	mutex_unlock(&local->mtx);
2369

2370 2371
	cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
			      IEEE80211_DEAUTH_FRAME_LEN);
2372
	sdata_unlock(sdata);
2373 2374
}

2375
static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
J
Johannes Berg 已提交
2376 2377 2378
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
2379
			     u.mgd.beacon_connection_loss_work);
2380 2381 2382 2383
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct sta_info *sta;

	if (ifmgd->associated) {
2384
		rcu_read_lock();
2385 2386 2387
		sta = sta_info_get(sdata, ifmgd->bssid);
		if (sta)
			sta->beacon_loss_count++;
2388
		rcu_read_unlock();
2389
	}
J
Johannes Berg 已提交
2390

2391
	if (ifmgd->connection_loss) {
2392 2393
		sdata_info(sdata, "Connection to AP %pM lost\n",
			   ifmgd->bssid);
2394
		__ieee80211_disconnect(sdata);
2395
	} else {
2396
		ieee80211_mgd_probe_ap(sdata, true);
2397 2398 2399 2400 2401 2402 2403 2404 2405
	}
}

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);

2406
	__ieee80211_disconnect(sdata);
J
Johannes Berg 已提交
2407 2408
}

2409 2410 2411
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2412
	struct ieee80211_hw *hw = &sdata->local->hw;
2413

J
Johannes Berg 已提交
2414 2415
	trace_api_beacon_loss(sdata);

2416
	sdata->u.mgd.connection_loss = false;
2417
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2418 2419 2420
}
EXPORT_SYMBOL(ieee80211_beacon_loss);

2421 2422 2423 2424 2425
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
2426 2427
	trace_api_connection_loss(sdata);

2428
	sdata->u.mgd.connection_loss = true;
2429 2430 2431 2432 2433
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_connection_loss);


J
Johannes Berg 已提交
2434 2435 2436 2437 2438
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;

2439
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2440 2441 2442 2443 2444 2445

	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);
2446
		sdata->u.mgd.flags = 0;
2447
		mutex_lock(&sdata->local->mtx);
J
Johannes Berg 已提交
2448
		ieee80211_vif_release_channel(sdata);
2449
		mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
2450 2451
	}

2452
	cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
J
Johannes Berg 已提交
2453 2454 2455 2456 2457 2458 2459
	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)
{
2460
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
2461 2462 2463
	struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
	u8 *pos;
	struct ieee802_11_elems elems;
2464
	u32 tx_flags = 0;
J
Johannes Berg 已提交
2465 2466

	pos = mgmt->u.auth.variable;
2467
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2468 2469 2470
	if (!elems.challenge)
		return;
	auth_data->expected_transaction = 4;
J
Johannes Berg 已提交
2471
	drv_mgd_prepare_tx(sdata->local, sdata);
2472 2473 2474
	if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
		tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
			   IEEE80211_TX_INTFL_MLME_CONN_TX;
2475
	ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
J
Johannes Berg 已提交
2476 2477 2478
			    elems.challenge - 2, elems.challenge_len + 2,
			    auth_data->bss->bssid, auth_data->bss->bssid,
			    auth_data->key, auth_data->key_len,
2479
			    auth_data->key_idx, tx_flags);
J
Johannes Berg 已提交
2480 2481
}

2482 2483
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
2484 2485 2486 2487 2488 2489
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u8 bssid[ETH_ALEN];
	u16 auth_alg, auth_transaction, status_code;
	struct sta_info *sta;

2490
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2491 2492

	if (len < 24 + 6)
2493
		return;
J
Johannes Berg 已提交
2494 2495

	if (!ifmgd->auth_data || ifmgd->auth_data->done)
2496
		return;
J
Johannes Berg 已提交
2497 2498 2499

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

2500
	if (!ether_addr_equal(bssid, mgmt->bssid))
2501
		return;
J
Johannes Berg 已提交
2502 2503 2504 2505 2506 2507

	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 ||
2508 2509 2510 2511 2512
	    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);
2513
		return;
2514
	}
J
Johannes Berg 已提交
2515 2516

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
2517 2518
		sdata_info(sdata, "%pM denied authentication (status %d)\n",
			   mgmt->sa, status_code);
2519
		ieee80211_destroy_auth_data(sdata, false);
2520
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2521
		return;
J
Johannes Berg 已提交
2522 2523 2524 2525 2526 2527
	}

	switch (ifmgd->auth_data->algorithm) {
	case WLAN_AUTH_OPEN:
	case WLAN_AUTH_LEAP:
	case WLAN_AUTH_FT:
2528
	case WLAN_AUTH_SAE:
J
Johannes Berg 已提交
2529 2530 2531 2532 2533
		break;
	case WLAN_AUTH_SHARED_KEY:
		if (ifmgd->auth_data->expected_transaction != 4) {
			ieee80211_auth_challenge(sdata, mgmt, len);
			/* need another frame */
2534
			return;
J
Johannes Berg 已提交
2535 2536 2537 2538 2539
		}
		break;
	default:
		WARN_ONCE(1, "invalid auth alg %d",
			  ifmgd->auth_data->algorithm);
2540
		return;
J
Johannes Berg 已提交
2541 2542
	}

J
Johannes Berg 已提交
2543
	sdata_info(sdata, "authenticated\n");
J
Johannes Berg 已提交
2544 2545
	ifmgd->auth_data->done = true;
	ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2546
	ifmgd->auth_data->timeout_started = true;
2547
	run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
2548

2549 2550 2551 2552 2553 2554
	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.
		 */
2555
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2556
		return;
2557 2558
	}

J
Johannes Berg 已提交
2559 2560 2561 2562 2563 2564 2565 2566
	/* 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
2567
		sdata_info(sdata, "failed moving %pM to auth\n", bssid);
J
Johannes Berg 已提交
2568 2569 2570 2571
		goto out_err;
	}
	mutex_unlock(&sdata->local->sta_mtx);

2572
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2573
	return;
J
Johannes Berg 已提交
2574 2575 2576 2577 2578
 out_err:
	mutex_unlock(&sdata->local->sta_mtx);
	/* ignore frame -- wait for timeout */
}

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 2626 2627 2628 2629 2630 2631 2632 2633 2634
#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
2635

2636 2637
static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
2638
{
2639
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2640
	const u8 *bssid = NULL;
2641 2642
	u16 reason_code;

2643
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2644

2645
	if (len < 24 + 2)
2646
		return;
2647

J
Johannes Berg 已提交
2648
	if (!ifmgd->associated ||
2649
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2650
		return;
2651

2652
	bssid = ifmgd->associated->bssid;
2653 2654 2655

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

2656 2657
	sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
		   bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
2658

2659 2660
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2661
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2662 2663 2664
}


2665 2666
static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_mgmt *mgmt, size_t len)
2667
{
2668
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2669 2670
	u16 reason_code;

2671
	sdata_assert_lock(sdata);
2672

J
Johannes Berg 已提交
2673
	if (len < 24 + 2)
2674
		return;
2675

J
Johannes Berg 已提交
2676
	if (!ifmgd->associated ||
2677
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2678
		return;
2679 2680 2681

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

J
Johannes Berg 已提交
2682 2683
	sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
		   mgmt->sa, reason_code);
2684

2685 2686
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2687
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2688 2689
}

2690 2691 2692 2693
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,
2694 2695
				int *min_rate, int *min_rate_index,
				int shift, u32 rate_flags)
2696 2697 2698 2699
{
	int i, j;

	for (i = 0; i < supp_rates_len; i++) {
2700
		int rate = supp_rates[i] & 0x7f;
2701 2702
		bool is_basic = !!(supp_rates[i] & 0x80);

2703
		if ((rate * 5 * (1 << shift)) > 110)
2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718
			*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++) {
2719 2720 2721 2722 2723 2724 2725 2726 2727
			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) {
2728 2729 2730
				*rates |= BIT(j);
				if (is_basic)
					*basic_rates |= BIT(j);
2731 2732
				if ((rate * 5) < *min_rate) {
					*min_rate = rate * 5;
2733 2734 2735 2736 2737 2738 2739
					*min_rate_index = j;
				}
				break;
			}
		}
	}
}
2740

J
Johannes Berg 已提交
2741 2742 2743 2744 2745
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;

2746
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2747 2748 2749 2750 2751 2752

	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);
2753
		sdata->u.mgd.flags = 0;
2754
		mutex_lock(&sdata->local->mtx);
J
Johannes Berg 已提交
2755
		ieee80211_vif_release_channel(sdata);
2756
		mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
2757 2758 2759 2760 2761 2762 2763 2764
	}

	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
2765
				    struct ieee80211_mgmt *mgmt, size_t len)
2766
{
2767
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2768
	struct ieee80211_local *local = sdata->local;
2769
	struct ieee80211_supported_band *sband;
2770
	struct sta_info *sta;
J
Johannes Berg 已提交
2771 2772
	u8 *pos;
	u16 capab_info, aid;
2773
	struct ieee802_11_elems elems;
J
Johannes Berg 已提交
2774
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2775 2776
	const struct cfg80211_bss_ies *bss_ies = NULL;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
J
Johannes Berg 已提交
2777
	u32 changed = 0;
2778
	int err;
2779
	bool ret;
2780

J
Johannes Berg 已提交
2781
	/* AssocResp and ReassocResp have identical structure */
2782 2783

	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
J
Johannes Berg 已提交
2784
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2785

2786
	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
J
Johannes Berg 已提交
2787 2788
		sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
			   aid);
2789 2790
	aid &= ~(BIT(15) | BIT(14));

2791 2792 2793
	ifmgd->broken_ap = false;

	if (aid == 0 || aid > IEEE80211_MAX_AID) {
J
Johannes Berg 已提交
2794 2795
		sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
			   aid);
2796 2797 2798 2799
		aid = 0;
		ifmgd->broken_ap = true;
	}

J
Johannes Berg 已提交
2800
	pos = mgmt->u.assoc_resp.variable;
2801
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2802

2803
	if (!elems.supp_rates) {
J
Johannes Berg 已提交
2804
		sdata_info(sdata, "no SuppRates element in AssocResp\n");
J
Johannes Berg 已提交
2805
		return false;
2806 2807
	}

2808
	ifmgd->aid = aid;
2809 2810 2811
	ifmgd->tdls_chan_switch_prohibited =
		elems.ext_capab && elems.ext_capab_len >= 5 &&
		(elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
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 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875
	/*
	 * 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");
		}
	}

2876 2877 2878 2879 2880 2881 2882
	/*
	 * 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,
2883 2884 2885
			   "HT AP is missing WMM params or HT capability/operation\n");
		ret = false;
		goto out;
2886 2887 2888 2889 2890
	}

	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    (!elems.vht_cap_elem || !elems.vht_operation)) {
		sdata_info(sdata,
2891 2892 2893
			   "VHT AP is missing VHT capability/operation\n");
		ret = false;
		goto out;
2894 2895
	}

2896 2897 2898 2899 2900
	mutex_lock(&sdata->local->sta_mtx);
	/*
	 * station info was already allocated and inserted before
	 * the association and should be available to us
	 */
2901
	sta = sta_info_get(sdata, cbss->bssid);
2902 2903
	if (WARN_ON(!sta)) {
		mutex_unlock(&sdata->local->sta_mtx);
2904 2905
		ret = false;
		goto out;
2906
	}
2907

J
Johannes Berg 已提交
2908
	sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2909

2910
	/* Set up internal HT/VHT capabilities */
2911
	if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
B
Ben Greear 已提交
2912
		ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2913
						  elems.ht_cap_elem, sta);
2914

M
Mahesh Palivela 已提交
2915 2916
	if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
		ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2917
						    elems.vht_cap_elem, sta);
M
Mahesh Palivela 已提交
2918

2919 2920 2921 2922 2923 2924
	/*
	 * 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.
	 */
2925

2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940
	/*
	 * 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;
	}

2941
	rate_control_rate_init(sta);
2942

2943
	if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
J
Johannes Berg 已提交
2944
		set_sta_flag(sta, WLAN_STA_MFP);
2945

2946
	sta->sta.wme = elems.wmm_param;
2947

2948
	err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2949 2950 2951
	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
2952 2953 2954
		sdata_info(sdata,
			   "failed to move station %pM to desired state\n",
			   sta->sta.addr);
2955 2956
		WARN_ON(__sta_info_destroy(sta));
		mutex_unlock(&sdata->local->sta_mtx);
2957 2958
		ret = false;
		goto out;
2959 2960
	}

2961
	mutex_unlock(&sdata->local->sta_mtx);
2962

2963 2964 2965 2966 2967 2968 2969 2970
	/*
	 * 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;

2971
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2972
		ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
J
Johannes Berg 已提交
2973
					 elems.wmm_param_len);
2974
	else
2975 2976
		ieee80211_set_wmm_default(sdata, false);
	changed |= BSS_CHANGED_QOS;
2977

J
Johannes Berg 已提交
2978 2979 2980 2981
	/* set AID and assoc capability,
	 * ieee80211_set_associated() will tell the driver */
	bss_conf->aid = aid;
	bss_conf->assoc_capability = capab_info;
2982
	ieee80211_set_associated(sdata, cbss, changed);
2983

2984 2985 2986 2987 2988 2989 2990
	/*
	 * 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);

2991
	/*
J
Johannes Berg 已提交
2992 2993
	 * Start timer to probe the connection to the AP now.
	 * Also start the timer that will detect beacon loss.
2994
	 */
J
Johannes Berg 已提交
2995
	ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2996
	ieee80211_sta_reset_beacon_monitor(sdata);
2997

2998 2999 3000 3001
	ret = true;
 out:
	kfree(bss_ies);
	return ret;
3002 3003
}

3004 3005 3006
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
3007 3008 3009 3010 3011
{
	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;
3012
	int ac, uapsd_queues = -1;
J
Johannes Berg 已提交
3013 3014
	u8 *pos;
	bool reassoc;
3015
	struct cfg80211_bss *bss;
J
Johannes Berg 已提交
3016

3017
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3018 3019

	if (!assoc_data)
3020
		return;
3021
	if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3022
		return;
J
Johannes Berg 已提交
3023 3024 3025 3026 3027 3028 3029

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

	if (len < 24 + 6)
3030
		return;
J
Johannes Berg 已提交
3031 3032 3033 3034 3035 3036

	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
3037 3038 3039 3040
	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
3041 3042

	pos = mgmt->u.assoc_resp.variable;
3043
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
3044 3045

	if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3046 3047
	    elems.timeout_int &&
	    elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
J
Johannes Berg 已提交
3048
		u32 tu, ms;
3049
		tu = le32_to_cpu(elems.timeout_int->value);
J
Johannes Berg 已提交
3050
		ms = tu * 1024 / 1000;
J
Johannes Berg 已提交
3051 3052 3053
		sdata_info(sdata,
			   "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
			   mgmt->sa, tu, ms);
J
Johannes Berg 已提交
3054
		assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3055
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
3056
		if (ms > IEEE80211_ASSOC_TIMEOUT)
3057 3058
			run_again(sdata, assoc_data->timeout);
		return;
J
Johannes Berg 已提交
3059 3060
	}

3061
	bss = assoc_data->bss;
J
Johannes Berg 已提交
3062 3063

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
3064 3065
		sdata_info(sdata, "%pM denied association (code=%d)\n",
			   mgmt->sa, status_code);
J
Johannes Berg 已提交
3066 3067
		ieee80211_destroy_assoc_data(sdata, false);
	} else {
3068
		if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
J
Johannes Berg 已提交
3069
			/* oops -- internal error -- send timeout for now */
3070
			ieee80211_destroy_assoc_data(sdata, false);
3071
			cfg80211_assoc_timeout(sdata->dev, bss);
3072
			return;
J
Johannes Berg 已提交
3073
		}
3074
		sdata_info(sdata, "associated\n");
3075 3076 3077 3078 3079 3080 3081

		/*
		 * 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);
3082 3083 3084 3085 3086 3087

		/* 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
3088 3089
	}

3090
	cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
J
Johannes Berg 已提交
3091
}
J
Johannes Berg 已提交
3092

3093
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
3094
				  struct ieee80211_mgmt *mgmt, size_t len,
3095
				  struct ieee80211_rx_status *rx_status,
3096
				  struct ieee802_11_elems *elems)
3097 3098
{
	struct ieee80211_local *local = sdata->local;
3099
	struct ieee80211_bss *bss;
3100
	struct ieee80211_channel *channel;
3101

3102
	sdata_assert_lock(sdata);
3103

3104 3105
	channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
	if (!channel)
3106 3107 3108
		return;

	bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3109
					channel);
3110 3111
	if (bss) {
		sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3112
		ieee80211_rx_bss_put(local, bss);
3113
	}
3114 3115 3116
}


3117
static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
3118
					 struct sk_buff *skb)
3119
{
J
Johannes Berg 已提交
3120
	struct ieee80211_mgmt *mgmt = (void *)skb->data;
3121
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
3122 3123
	struct ieee80211_rx_status *rx_status = (void *) skb->cb;
	size_t baselen, len = skb->len;
3124 3125
	struct ieee802_11_elems elems;

3126 3127
	ifmgd = &sdata->u.mgd;

3128
	sdata_assert_lock(sdata);
3129

3130
	if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3131 3132
		return; /* ignore ProbeResp to foreign address */

3133 3134 3135 3136 3137
	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
	if (baselen > len)
		return;

	ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3138
			       false, &elems);
3139

3140
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3141

3142
	if (ifmgd->associated &&
3143
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3144
		ieee80211_reset_ap_probe(sdata);
J
Johannes Berg 已提交
3145 3146

	if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
3147
	    ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
J
Johannes Berg 已提交
3148
		/* got probe response, continue with auth */
J
Johannes Berg 已提交
3149
		sdata_info(sdata, "direct probe responded\n");
J
Johannes Berg 已提交
3150 3151
		ifmgd->auth_data->tries = 0;
		ifmgd->auth_data->timeout = jiffies;
3152
		ifmgd->auth_data->timeout_started = true;
3153
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
3154
	}
3155 3156
}

3157 3158 3159
/*
 * This is the canonical list of information elements we care about,
 * the filter code also gives us all changes to the Microsoft OUI
3160 3161 3162
 * (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.
3163 3164 3165 3166 3167 3168 3169 3170 3171 3172
 *
 * 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 =
3173 3174 3175 3176 3177
	(1ULL << WLAN_EID_COUNTRY) |
	(1ULL << WLAN_EID_ERP_INFO) |
	(1ULL << WLAN_EID_CHANNEL_SWITCH) |
	(1ULL << WLAN_EID_PWR_CONSTRAINT) |
	(1ULL << WLAN_EID_HT_CAPABILITY) |
3178
	(1ULL << WLAN_EID_HT_OPERATION);
3179

3180 3181 3182
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)
3183
{
3184
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3185
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3186 3187
	size_t baselen;
	struct ieee802_11_elems elems;
3188
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
3189 3190
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
3191
	struct sta_info *sta;
3192
	u32 changed = 0;
3193
	bool erp_valid;
J
Johannes Berg 已提交
3194
	u8 erp_value = 0;
3195
	u32 ncrc;
3196
	u8 *bssid;
3197
	u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3198

3199
	sdata_assert_lock(sdata);
3200

3201 3202 3203
	/* Process beacon from the current BSS */
	baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
	if (baselen > len)
3204
		return;
3205

J
Johannes Berg 已提交
3206 3207 3208 3209
	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		rcu_read_unlock();
3210
		return;
J
Johannes Berg 已提交
3211 3212
	}

3213
	if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
J
Johannes Berg 已提交
3214
		rcu_read_unlock();
3215
		return;
J
Johannes Berg 已提交
3216
	}
3217
	chan = chanctx_conf->def.chan;
J
Johannes Berg 已提交
3218
	rcu_read_unlock();
3219

3220
	if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3221
	    ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
J
Johannes Berg 已提交
3222
		ieee802_11_parse_elems(mgmt->u.beacon.variable,
3223
				       len - baselen, false, &elems);
3224

3225
		ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3226 3227 3228 3229
		if (elems.tim && !elems.parse_error) {
			const struct ieee80211_tim_ie *tim_ie = elems.tim;
			ifmgd->dtim_period = tim_ie->dtim_period;
		}
3230
		ifmgd->have_beacon = true;
3231
		ifmgd->assoc_data->need_beacon = false;
3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242
		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
3243 3244
		/* continue assoc process */
		ifmgd->assoc_data->timeout = jiffies;
3245
		ifmgd->assoc_data->timeout_started = true;
3246 3247
		run_again(sdata, ifmgd->assoc_data->timeout);
		return;
J
Johannes Berg 已提交
3248
	}
3249

J
Johannes Berg 已提交
3250
	if (!ifmgd->associated ||
3251
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3252
		return;
J
Johannes Berg 已提交
3253
	bssid = ifmgd->associated->bssid;
3254

3255 3256 3257 3258
	/* 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;
3259
		ifmgd->ave_beacon_signal = rx_status->signal * 16;
3260
		ifmgd->last_cqm_event_signal = 0;
3261
		ifmgd->count_beacon_signal = 1;
3262
		ifmgd->last_ave_beacon_signal = 0;
3263 3264 3265 3266 3267
	} else {
		ifmgd->ave_beacon_signal =
			(IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
			 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
			 ifmgd->ave_beacon_signal) / 16;
3268
		ifmgd->count_beacon_signal++;
3269
	}
3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282

	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;
3283
			drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
3284 3285 3286 3287
		} else if (sig < ifmgd->rssi_min_thold &&
			   (last_sig >= ifmgd->rssi_max_thold ||
			   last_sig == 0)) {
			ifmgd->last_ave_beacon_signal = sig;
3288
			drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
3289 3290 3291
		}
	}

3292
	if (bss_conf->cqm_rssi_thold &&
3293
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3294
	    !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315
		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);
		}
	}

3316
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
J
Johannes Berg 已提交
3317
		mlme_dbg_ratelimited(sdata,
3318
				     "cancelling AP probe due to a received beacon\n");
3319
		ieee80211_reset_ap_probe(sdata);
3320 3321
	}

J
Johannes Berg 已提交
3322 3323 3324 3325
	/*
	 * Push the beacon loss detection into the future since
	 * we are processing a beacon from the AP just now.
	 */
3326
	ieee80211_sta_reset_beacon_monitor(sdata);
J
Johannes Berg 已提交
3327

3328 3329
	ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
	ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3330
					  len - baselen, false, &elems,
3331 3332
					  care_about_ies, ncrc);

3333
	if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3334 3335 3336
		bool directed_tim = ieee80211_check_tim(elems.tim,
							elems.tim_len,
							ifmgd->aid);
3337
		if (directed_tim) {
3338
			if (local->hw.conf.dynamic_ps_timeout > 0) {
3339 3340 3341 3342 3343
				if (local->hw.conf.flags & IEEE80211_CONF_PS) {
					local->hw.conf.flags &= ~IEEE80211_CONF_PS;
					ieee80211_hw_config(local,
							    IEEE80211_CONF_CHANGE_PS);
				}
3344
				ieee80211_send_nullfunc(local, sdata, 0);
3345
			} else if (!local->pspolling && sdata->u.mgd.powersave) {
3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357
				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);
			}
3358 3359
		}
	}
J
Johannes Berg 已提交
3360

3361
	if (sdata->vif.p2p) {
J
Janusz Dziedzic 已提交
3362
		struct ieee80211_p2p_noa_attr noa = {};
3363 3364 3365 3366 3367
		int ret;

		ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
					    len - baselen,
					    IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3368
					    (u8 *) &noa, sizeof(noa));
J
Janusz Dziedzic 已提交
3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384
		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));
3385 3386 3387 3388 3389
			changed |= BSS_CHANGED_P2P_PS;
			ifmgd->beacon_crc_valid = false;
		}
	}

3390 3391 3392
	if (ifmgd->csa_waiting_bcn)
		ieee80211_chswitch_post_beacon(sdata);

3393
	if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3394
		return;
3395
	ifmgd->beacon_crc = ncrc;
3396
	ifmgd->beacon_crc_valid = true;
3397

3398
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3399

3400
	ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3401
					 rx_status->device_timestamp,
3402 3403
					 &elems, true);

3404 3405
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
	    ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3406 3407 3408
				     elems.wmm_param_len))
		changed |= BSS_CHANGED_QOS;

3409 3410
	/*
	 * If we haven't had a beacon before, tell the driver about the
3411
	 * DTIM period (and beacon timing if desired) now.
3412
	 */
3413
	if (!ifmgd->have_beacon) {
3414 3415 3416 3417 3418
		/* 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;
3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431

		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;
		}

3432 3433
		changed |= BSS_CHANGED_BEACON_INFO;
		ifmgd->have_beacon = true;
3434 3435 3436 3437 3438

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

3439
		ieee80211_recalc_ps_vif(sdata);
3440 3441
	}

3442
	if (elems.erp_info) {
J
Johannes Berg 已提交
3443 3444 3445 3446
		erp_valid = true;
		erp_value = elems.erp_info[0];
	} else {
		erp_valid = false;
3447
	}
J
Johannes Berg 已提交
3448 3449 3450
	changed |= ieee80211_handle_bss_capability(sdata,
			le16_to_cpu(mgmt->u.beacon.capab_info),
			erp_valid, erp_value);
3451

3452
	mutex_lock(&local->sta_mtx);
3453 3454
	sta = sta_info_get(sdata, bssid);

3455 3456
	if (ieee80211_config_bw(sdata, sta,
				elems.ht_cap_elem, elems.ht_operation,
3457 3458 3459 3460 3461
				elems.vht_operation, bssid, &changed)) {
		mutex_unlock(&local->sta_mtx);
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_DEAUTH_LEAVING,
				       true, deauth_buf);
3462 3463
		cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
				      sizeof(deauth_buf));
3464
		return;
3465
	}
3466 3467 3468 3469

	if (sta && elems.opmode_notif)
		ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
					    rx_status->band, true);
3470
	mutex_unlock(&local->sta_mtx);
3471

3472 3473 3474
	changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
					       elems.country_elem,
					       elems.country_elem_len,
3475 3476
					       elems.pwr_constr_elem,
					       elems.cisco_dtpc_elem);
3477

3478
	ieee80211_bss_info_change_notify(sdata, changed);
3479 3480
}

3481 3482
void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
				  struct sk_buff *skb)
3483 3484 3485 3486
{
	struct ieee80211_rx_status *rx_status;
	struct ieee80211_mgmt *mgmt;
	u16 fc;
3487 3488
	struct ieee802_11_elems elems;
	int ies_len;
3489 3490 3491 3492 3493

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

3494
	sdata_lock(sdata);
3495

J
Johannes Berg 已提交
3496 3497
	switch (fc & IEEE80211_FCTL_STYPE) {
	case IEEE80211_STYPE_BEACON:
3498
		ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
J
Johannes Berg 已提交
3499 3500 3501 3502 3503
		break;
	case IEEE80211_STYPE_PROBE_RESP:
		ieee80211_rx_mgmt_probe_resp(sdata, skb);
		break;
	case IEEE80211_STYPE_AUTH:
3504
		ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3505 3506
		break;
	case IEEE80211_STYPE_DEAUTH:
3507
		ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3508 3509
		break;
	case IEEE80211_STYPE_DISASSOC:
3510
		ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3511 3512 3513
		break;
	case IEEE80211_STYPE_ASSOC_RESP:
	case IEEE80211_STYPE_REASSOC_RESP:
3514
		ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3515 3516
		break;
	case IEEE80211_STYPE_ACTION:
3517
		if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3518 3519 3520
			ies_len = skb->len -
				  offsetof(struct ieee80211_mgmt,
					   u.action.u.chan_switch.variable);
3521 3522 3523 3524 3525 3526

			if (ies_len < 0)
				break;

			ieee802_11_parse_elems(
				mgmt->u.action.u.chan_switch.variable,
3527
				ies_len, true, &elems);
3528 3529 3530 3531

			if (elems.parse_error)
				break;

3532
			ieee80211_sta_process_chanswitch(sdata,
3533 3534 3535
						 rx_status->mactime,
						 rx_status->device_timestamp,
						 &elems, false);
3536 3537 3538 3539 3540 3541 3542 3543 3544 3545
		} 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,
3546
				ies_len, true, &elems);
3547 3548 3549 3550 3551 3552 3553 3554

			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
3555
			ieee80211_sta_process_chanswitch(sdata,
3556 3557 3558
						 rx_status->mactime,
						 rx_status->device_timestamp,
						 &elems, false);
3559
		}
3560
		break;
3561
	}
3562
	sdata_unlock(sdata);
3563 3564
}

J
Johannes Berg 已提交
3565
static void ieee80211_sta_timer(unsigned long data)
3566
{
J
Johannes Berg 已提交
3567 3568
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
3569

3570
	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3571 3572
}

3573
static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3574
					  u8 *bssid, u8 reason, bool tx)
3575
{
3576
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3577

3578
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3579
			       tx, frame_buf);
3580

3581 3582
	cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
			      IEEE80211_DEAUTH_FRAME_LEN);
3583 3584
}

J
Johannes Berg 已提交
3585 3586 3587 3588 3589
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;
3590
	u32 tx_flags = 0;
J
Johannes Berg 已提交
3591

3592
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3593 3594 3595 3596 3597 3598 3599

	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
3600 3601
		sdata_info(sdata, "authentication with %pM timed out\n",
			   auth_data->bss->bssid);
J
Johannes Berg 已提交
3602 3603 3604 3605 3606 3607 3608 3609 3610 3611

		/*
		 * 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
3612 3613
	drv_mgd_prepare_tx(local, sdata);

J
Johannes Berg 已提交
3614
	if (auth_data->bss->proberesp_ies) {
3615 3616 3617
		u16 trans = 1;
		u16 status = 0;

J
Johannes Berg 已提交
3618 3619 3620
		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
3621 3622

		auth_data->expected_transaction = 2;
3623 3624 3625 3626 3627 3628 3629

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

3630 3631 3632 3633
		if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
			tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
				   IEEE80211_TX_INTFL_MLME_CONN_TX;

3634 3635
		ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
				    auth_data->data, auth_data->data_len,
J
Johannes Berg 已提交
3636
				    auth_data->bss->bssid,
3637 3638
				    auth_data->bss->bssid, NULL, 0, 0,
				    tx_flags);
J
Johannes Berg 已提交
3639 3640 3641
	} else {
		const u8 *ssidie;

J
Johannes Berg 已提交
3642 3643 3644
		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
3645

3646
		rcu_read_lock();
J
Johannes Berg 已提交
3647
		ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3648 3649
		if (!ssidie) {
			rcu_read_unlock();
J
Johannes Berg 已提交
3650
			return -EINVAL;
3651
		}
J
Johannes Berg 已提交
3652 3653 3654 3655
		/*
		 * Direct probe is sent to broadcast address as some APs
		 * will not answer to direct packet in unassociated state.
		 */
3656 3657
		ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL,
					 ssidie + 2, ssidie[1],
3658
					 NULL, 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
3659
					 auth_data->bss->channel, false);
3660
		rcu_read_unlock();
J
Johannes Berg 已提交
3661 3662
	}

3663
	if (tx_flags == 0) {
3664
		auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3665
		auth_data->timeout_started = true;
3666
		run_again(sdata, auth_data->timeout);
3667
	} else {
3668 3669 3670 3671
		auth_data->timeout =
			round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
		auth_data->timeout_started = true;
		run_again(sdata, auth_data->timeout);
3672
	}
J
Johannes Berg 已提交
3673 3674 3675 3676 3677 3678 3679 3680 3681

	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;

3682
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3683 3684 3685

	assoc_data->tries++;
	if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
J
Johannes Berg 已提交
3686 3687
		sdata_info(sdata, "association with %pM timed out\n",
			   assoc_data->bss->bssid);
J
Johannes Berg 已提交
3688 3689 3690 3691 3692 3693 3694 3695 3696 3697

		/*
		 * 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
3698 3699 3700
	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
3701 3702
	ieee80211_send_assoc(sdata);

3703 3704
	if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
		assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3705
		assoc_data->timeout_started = true;
3706
		run_again(sdata, assoc_data->timeout);
3707
	} else {
3708 3709 3710 3711 3712
		assoc_data->timeout =
			round_jiffies_up(jiffies +
					 IEEE80211_ASSOC_TIMEOUT_LONG);
		assoc_data->timeout_started = true;
		run_again(sdata, assoc_data->timeout);
3713
	}
J
Johannes Berg 已提交
3714 3715 3716 3717

	return 0;
}

3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729
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);
}

3730
void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
3731 3732
{
	struct ieee80211_local *local = sdata->local;
3733
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3734

3735
	sdata_lock(sdata);
3736

3737 3738 3739 3740 3741 3742 3743 3744 3745 3746
	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;
3747
				run_again(sdata, ifmgd->auth_data->timeout);
3748 3749 3750
			} else {
				ifmgd->auth_data->timeout = jiffies - 1;
			}
3751
			ifmgd->auth_data->timeout_started = true;
3752 3753 3754 3755 3756 3757
		} 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;
3758
				run_again(sdata, ifmgd->assoc_data->timeout);
3759 3760 3761
			} else {
				ifmgd->assoc_data->timeout = jiffies - 1;
			}
3762
			ifmgd->assoc_data->timeout_started = true;
3763 3764 3765
		}
	}

3766
	if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
J
Johannes Berg 已提交
3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780
	    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);

3781
			cfg80211_auth_timeout(sdata->dev, bssid);
J
Johannes Berg 已提交
3782
		}
3783
	} else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3784
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
3785

3786
	if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
J
Johannes Berg 已提交
3787
	    time_after(jiffies, ifmgd->assoc_data->timeout)) {
3788
		if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
J
Johannes Berg 已提交
3789
		    ieee80211_do_assoc(sdata)) {
3790
			struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
J
Johannes Berg 已提交
3791 3792

			ieee80211_destroy_assoc_data(sdata, false);
3793
			cfg80211_assoc_timeout(sdata->dev, bss);
J
Johannes Berg 已提交
3794
		}
3795
	} else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3796
		run_again(sdata, ifmgd->assoc_data->timeout);
J
Johannes Berg 已提交
3797

3798
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
J
Johannes Berg 已提交
3799
	    ifmgd->associated) {
3800
		u8 bssid[ETH_ALEN];
3801
		int max_tries;
3802

3803
		memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3804

3805
		if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3806
			max_tries = max_nullfunc_tries;
3807
		else
3808
			max_tries = max_probe_tries;
3809

3810 3811 3812
		/* ACK received for nullfunc probing frame */
		if (!ifmgd->probe_send_count)
			ieee80211_reset_ap_probe(sdata);
3813 3814
		else if (ifmgd->nullfunc_failed) {
			if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3815 3816 3817 3818
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
					 bssid, ifmgd->probe_send_count,
					 max_tries);
3819 3820
				ieee80211_mgd_probe_ap_send(sdata);
			} else {
J
Johannes Berg 已提交
3821 3822 3823
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
					 bssid);
3824
				ieee80211_sta_connection_lost(sdata, bssid,
3825 3826
					WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
					false);
3827 3828
			}
		} else if (time_is_after_jiffies(ifmgd->probe_timeout))
3829
			run_again(sdata, ifmgd->probe_timeout);
3830
		else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
J
Johannes Berg 已提交
3831 3832 3833
			mlme_dbg(sdata,
				 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
				 bssid, probe_wait_ms);
3834
			ieee80211_sta_connection_lost(sdata, bssid,
3835
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3836
		} else if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3837 3838 3839 3840
			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);
3841 3842
			ieee80211_mgd_probe_ap_send(sdata);
		} else {
J
Johannes Berg 已提交
3843 3844 3845 3846
			/*
			 * We actually lost the connection ... or did we?
			 * Let's make sure!
			 */
3847 3848 3849 3850
			wiphy_debug(local->hw.wiphy,
				    "%s: No probe response from AP %pM"
				    " after %dms, disconnecting.\n",
				    sdata->name,
3851
				    bssid, probe_wait_ms);
3852

3853
			ieee80211_sta_connection_lost(sdata, bssid,
3854
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
J
Johannes Berg 已提交
3855 3856 3857
		}
	}

3858
	sdata_unlock(sdata);
3859 3860
}

J
Johannes Berg 已提交
3861 3862 3863 3864 3865
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;
3866
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3867 3868 3869 3870

	if (local->quiescing)
		return;

3871
	if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
M
Michal Kazior 已提交
3872 3873
		return;

3874
	sdata->u.mgd.connection_loss = false;
3875 3876
	ieee80211_queue_work(&sdata->local->hw,
			     &sdata->u.mgd.beacon_connection_loss_work);
J
Johannes Berg 已提交
3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888
}

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;

3889
	if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
M
Michal Kazior 已提交
3890 3891
		return;

3892
	ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
J
Johannes Berg 已提交
3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903
}

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
3904 3905
static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
3906 3907
	u32 flags;

3908
	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3909
		__ieee80211_stop_poll(sdata);
3910

J
Johannes Berg 已提交
3911
		/* let's probe the connection once */
3912 3913 3914 3915
		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
3916
		/* and do all the other regular work too */
J
Johannes Berg 已提交
3917
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3918
	}
J
Johannes Berg 已提交
3919
}
3920

3921
#ifdef CONFIG_PM
3922 3923 3924 3925 3926 3927 3928
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);

3929 3930 3931 3932 3933
	if (ifmgd->auth_data || ifmgd->assoc_data) {
		const u8 *bssid = ifmgd->auth_data ?
				ifmgd->auth_data->bss->bssid :
				ifmgd->assoc_data->bss->bssid;

3934
		/*
3935 3936 3937
		 * 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.
3938
		 */
3939
		ieee80211_send_deauth_disassoc(sdata, bssid,
3940 3941 3942
					       IEEE80211_STYPE_DEAUTH,
					       WLAN_REASON_DEAUTH_LEAVING,
					       false, frame_buf);
3943 3944 3945 3946
		if (ifmgd->assoc_data)
			ieee80211_destroy_assoc_data(sdata, false);
		if (ifmgd->auth_data)
			ieee80211_destroy_auth_data(sdata, false);
3947 3948 3949 3950 3951 3952 3953
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
	}

	sdata_unlock(sdata);
}

3954 3955 3956 3957
void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

3958
	sdata_lock(sdata);
3959
	if (!ifmgd->associated) {
3960
		sdata_unlock(sdata);
3961 3962 3963 3964 3965 3966 3967 3968 3969 3970
		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);
3971
		sdata_unlock(sdata);
3972 3973
		return;
	}
3974
	sdata_unlock(sdata);
3975 3976 3977
}
#endif

J
Johannes Berg 已提交
3978 3979
/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3980
{
3981
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
3982

3983
	ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3984
	INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3985
	INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3986 3987
	INIT_WORK(&ifmgd->beacon_connection_loss_work,
		  ieee80211_beacon_connection_loss_work);
3988 3989
	INIT_WORK(&ifmgd->csa_connection_drop_work,
		  ieee80211_csa_connection_drop_work);
3990
	INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
3991 3992
	INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
			  ieee80211_tdls_peer_del_work);
3993
	setup_timer(&ifmgd->timer, ieee80211_sta_timer,
S
Sujith 已提交
3994
		    (unsigned long) sdata);
J
Johannes Berg 已提交
3995 3996 3997 3998
	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);
3999
	setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
J
Johannes Berg 已提交
4000
		    (unsigned long) sdata);
4001 4002
	INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
			  ieee80211_sta_handle_tspec_ac_params_wk);
J
Johannes Berg 已提交
4003

4004
	ifmgd->flags = 0;
4005
	ifmgd->powersave = sdata->wdev.ps;
4006 4007
	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
4008
	ifmgd->p2p_noa_index = -1;
J
Johannes Berg 已提交
4009

4010
	if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4011 4012 4013
		ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
	else
		ifmgd->req_smps = IEEE80211_SMPS_OFF;
4014 4015 4016 4017 4018

	/* Setup TDLS data */
	spin_lock_init(&ifmgd->teardown_lock);
	ifmgd->teardown_skb = NULL;
	ifmgd->orig_teardown_skb = NULL;
4019 4020
}

4021 4022
/* scan finished notification */
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
J
Johannes Berg 已提交
4023
{
4024
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
4025

4026 4027
	/* Restart STA timers */
	rcu_read_lock();
4028 4029 4030 4031
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (ieee80211_sdata_running(sdata))
			ieee80211_restart_sta_timer(sdata);
	}
4032 4033
	rcu_read_unlock();
}
J
Johannes Berg 已提交
4034

4035 4036 4037 4038 4039 4040 4041
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);
4042

4043 4044 4045
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, latency_usec);
	mutex_unlock(&local->iflist_mtx);
4046

4047
	return NOTIFY_OK;
J
Johannes Berg 已提交
4048 4049
}

J
Johannes Berg 已提交
4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061
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;

4062
	ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
J
Johannes Berg 已提交
4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074
	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;

4075
	vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
J
Johannes Berg 已提交
4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093
	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;
}

4094 4095
static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
				  struct cfg80211_bss *cbss)
4096 4097 4098
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4099
	const struct ieee80211_ht_cap *ht_cap = NULL;
4100
	const struct ieee80211_ht_operation *ht_oper = NULL;
J
Johannes Berg 已提交
4101
	const struct ieee80211_vht_operation *vht_oper = NULL;
4102
	struct ieee80211_supported_band *sband;
4103
	struct cfg80211_chan_def chandef;
J
Johannes Berg 已提交
4104
	int ret;
4105

4106 4107
	sband = local->hw.wiphy->bands[cbss->channel->band];

J
Johannes Berg 已提交
4108 4109 4110 4111
	ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
			  IEEE80211_STA_DISABLE_80P80MHZ |
			  IEEE80211_STA_DISABLE_160MHZ);

4112 4113
	rcu_read_lock();

J
Johannes Berg 已提交
4114 4115
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	    sband->ht_cap.ht_supported) {
4116
		const u8 *ht_oper_ie, *ht_cap_ie;
4117

4118
		ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4119 4120
		if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
			ht_oper = (void *)(ht_oper_ie + 2);
4121

4122 4123 4124 4125 4126
		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) {
4127 4128 4129
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ht_oper = NULL;
		}
4130 4131
	}

J
Johannes Berg 已提交
4132 4133
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    sband->vht_cap.vht_supported) {
4134
		const u8 *vht_oper_ie, *vht_cap;
J
Johannes Berg 已提交
4135

4136 4137
		vht_oper_ie = ieee80211_bss_get_ie(cbss,
						   WLAN_EID_VHT_OPERATION);
J
Johannes Berg 已提交
4138 4139 4140 4141
		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
4142
			sdata_info(sdata,
J
Johannes Berg 已提交
4143
				   "AP advertised VHT without HT, disabling both\n");
4144 4145
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4146
		}
4147 4148 4149 4150 4151 4152

		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;
		}
4153 4154
	}

J
Johannes Berg 已提交
4155 4156
	ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
						     cbss->channel,
4157
						     ht_cap, ht_oper, vht_oper,
4158
						     &chandef, false);
4159

J
Johannes Berg 已提交
4160 4161
	sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
				      local->rx_chains);
4162

4163 4164
	rcu_read_unlock();

4165 4166 4167
	/* will change later if needed */
	sdata->smps_mode = IEEE80211_SMPS_OFF;

4168
	mutex_lock(&local->mtx);
J
Johannes Berg 已提交
4169 4170 4171 4172 4173 4174 4175
	/*
	 * 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);
4176 4177 4178 4179

	/* don't downgrade for 5 and 10 MHz channels, though. */
	if (chandef.width == NL80211_CHAN_WIDTH_5 ||
	    chandef.width == NL80211_CHAN_WIDTH_10)
4180
		goto out;
4181

4182
	while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4183
		ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4184 4185 4186
		ret = ieee80211_vif_use_channel(sdata, &chandef,
						IEEE80211_CHANCTX_SHARED);
	}
4187 4188
 out:
	mutex_unlock(&local->mtx);
J
Johannes Berg 已提交
4189
	return ret;
4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215
}

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
4216
	if (new_sta) {
4217 4218 4219
		u32 rates = 0, basic_rates = 0;
		bool have_higher_than_11mbit;
		int min_rate = INT_MAX, min_rate_index = -1;
4220
		struct ieee80211_chanctx_conf *chanctx_conf;
4221
		struct ieee80211_supported_band *sband;
J
Johannes Berg 已提交
4222
		const struct cfg80211_bss_ies *ies;
4223 4224
		int shift;
		u32 rate_flags;
4225 4226 4227 4228 4229 4230

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

		err = ieee80211_prep_channel(sdata, cbss);
		if (err) {
			sta_info_free(local, new_sta);
4231
			return -EINVAL;
4232
		}
4233 4234 4235 4236 4237 4238
		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
4239
			sta_info_free(local, new_sta);
4240 4241 4242 4243
			return -EINVAL;
		}
		rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
		rcu_read_unlock();
4244 4245 4246 4247 4248

		ieee80211_get_rates(sband, bss->supp_rates,
				    bss->supp_rates_len,
				    &rates, &basic_rates,
				    &have_higher_than_11mbit,
4249 4250
				    &min_rate, &min_rate_index,
				    shift, rate_flags);
4251 4252 4253 4254 4255 4256 4257 4258 4259 4260

		/*
		 * 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
4261 4262
			sdata_info(sdata,
				   "No basic rates, using min rate instead\n");
4263 4264 4265
			basic_rates = BIT(min_rate_index);
		}

J
Johannes Berg 已提交
4266
		new_sta->sta.supp_rates[cbss->channel->band] = rates;
4267 4268 4269
		sdata->vif.bss_conf.basic_rates = basic_rates;

		/* cf. IEEE 802.11 9.2.12 */
J
Johannes Berg 已提交
4270
		if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4271 4272 4273 4274 4275 4276 4277
		    have_higher_than_11mbit)
			sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
		else
			sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

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

4278 4279
		/* set timing information */
		sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
J
Johannes Berg 已提交
4280
		rcu_read_lock();
4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306
		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
4307
		rcu_read_unlock();
4308 4309

		/* tell driver about BSSID, basic rates and timing */
4310
		ieee80211_bss_info_change_notify(sdata,
4311 4312
			BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
			BSS_CHANGED_BEACON_INT);
4313 4314

		if (assoc)
J
Johannes Berg 已提交
4315
			sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4316

J
Johannes Berg 已提交
4317 4318
		err = sta_info_insert(new_sta);
		new_sta = NULL;
4319
		if (err) {
J
Johannes Berg 已提交
4320 4321 4322
			sdata_info(sdata,
				   "failed to insert STA entry for the AP (error %d)\n",
				   err);
4323 4324 4325
			return err;
		}
	} else
4326
		WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4327 4328 4329 4330

	return 0;
}

4331 4332 4333
/* config hooks */
int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
		       struct cfg80211_auth_request *req)
J
Johannes Berg 已提交
4334
{
J
Johannes Berg 已提交
4335 4336 4337
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data;
4338
	u16 auth_alg;
J
Johannes Berg 已提交
4339 4340 4341
	int err;

	/* prepare auth data structure */
J
Johannes Berg 已提交
4342

4343 4344 4345 4346 4347
	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
4348
		if (IS_ERR(local->wep_tx_tfm))
4349
			return -EOPNOTSUPP;
4350 4351 4352 4353 4354 4355 4356 4357
		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;
4358 4359 4360
	case NL80211_AUTHTYPE_SAE:
		auth_alg = WLAN_AUTH_SAE;
		break;
4361 4362
	default:
		return -EOPNOTSUPP;
J
Johannes Berg 已提交
4363
	}
4364

4365 4366
	auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
			    req->ie_len, GFP_KERNEL);
J
Johannes Berg 已提交
4367
	if (!auth_data)
J
Johannes Berg 已提交
4368
		return -ENOMEM;
4369

J
Johannes Berg 已提交
4370
	auth_data->bss = req->bss;
4371

4372 4373 4374 4375 4376 4377 4378 4379 4380
	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;
	}

4381
	if (req->ie && req->ie_len) {
4382 4383 4384
		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
4385
	}
4386

J
Johannes Berg 已提交
4387
	if (req->key && req->key_len) {
J
Johannes Berg 已提交
4388 4389 4390
		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
4391 4392
	}

J
Johannes Berg 已提交
4393
	auth_data->algorithm = auth_alg;
J
Johannes Berg 已提交
4394

J
Johannes Berg 已提交
4395
	/* try to authenticate/probe */
4396

J
Johannes Berg 已提交
4397 4398 4399 4400
	if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
	    ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
4401 4402
	}

J
Johannes Berg 已提交
4403 4404
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
4405

J
Johannes Berg 已提交
4406 4407
	/* prep auth_data so we don't go into idle on disassoc */
	ifmgd->auth_data = auth_data;
J
Johannes Berg 已提交
4408

4409 4410 4411 4412 4413 4414 4415
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

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

4416 4417
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      sizeof(frame_buf));
4418
	}
J
Johannes Berg 已提交
4419

J
Johannes Berg 已提交
4420
	sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4421

4422 4423
	err = ieee80211_prep_connection(sdata, req->bss, false);
	if (err)
J
Johannes Berg 已提交
4424
		goto err_clear;
J
Johannes Berg 已提交
4425

J
Johannes Berg 已提交
4426 4427 4428 4429 4430 4431 4432
	err = ieee80211_probe_auth(sdata);
	if (err) {
		sta_info_destroy_addr(sdata, req->bss->bssid);
		goto err_clear;
	}

	/* hold our own reference */
4433
	cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4434
	return 0;
J
Johannes Berg 已提交
4435 4436

 err_clear:
4437 4438
	memset(ifmgd->bssid, 0, ETH_ALEN);
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4439 4440 4441 4442
	ifmgd->auth_data = NULL;
 err_free:
	kfree(auth_data);
	return err;
J
Johannes Berg 已提交
4443 4444
}

4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482
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;
}

4483 4484
int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
			struct cfg80211_assoc_request *req)
4485
{
J
Johannes Berg 已提交
4486
	struct ieee80211_local *local = sdata->local;
4487
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4488
	struct ieee80211_bss *bss = (void *)req->bss->priv;
J
Johannes Berg 已提交
4489
	struct ieee80211_mgd_assoc_data *assoc_data;
4490
	const struct cfg80211_bss_ies *beacon_ies;
J
Johannes Berg 已提交
4491
	struct ieee80211_supported_band *sband;
4492
	const u8 *ssidie, *ht_ie, *vht_ie;
4493
	int i, err;
4494

J
Johannes Berg 已提交
4495 4496 4497 4498
	assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
	if (!assoc_data)
		return -ENOMEM;

4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509
	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();

4510 4511 4512 4513 4514 4515 4516
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

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

4517 4518
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      sizeof(frame_buf));
4519
	}
J
Johannes Berg 已提交
4520 4521 4522 4523

	if (ifmgd->auth_data && !ifmgd->auth_data->done) {
		err = -EBUSY;
		goto err_free;
J
Johannes Berg 已提交
4524
	}
4525

J
Johannes Berg 已提交
4526 4527 4528 4529
	if (ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
	}
4530

J
Johannes Berg 已提交
4531 4532 4533 4534
	if (ifmgd->auth_data) {
		bool match;

		/* keep sta info, bssid if matching */
4535
		match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
J
Johannes Berg 已提交
4536
		ieee80211_destroy_auth_data(sdata, match);
4537 4538
	}

J
Johannes Berg 已提交
4539
	/* prepare assoc data */
4540

4541 4542
	ifmgd->beacon_crc_valid = false;

4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578
	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
4579 4580 4581 4582 4583 4584 4585
	/*
	 * 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.
	 */
4586
	for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4587 4588
		if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4589
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4590
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4591
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4592
			netdev_info(sdata->dev,
4593
				    "disabling HT/VHT due to WEP/TKIP use\n");
4594 4595
		}
	}
4596

4597
	if (req->flags & ASSOC_REQ_DISABLE_HT) {
4598
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4599 4600
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
	}
B
Ben Greear 已提交
4601

4602 4603 4604
	if (req->flags & ASSOC_REQ_DISABLE_VHT)
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;

J
Johannes Berg 已提交
4605 4606 4607
	/* 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 ||
4608 4609
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4610
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4611 4612
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4613 4614
			netdev_info(sdata->dev,
				    "disabling HT as WMM/QoS is not supported by the AP\n");
4615
	}
J
Johannes Berg 已提交
4616

4617 4618
	/* disable VHT if we don't support it or the AP doesn't use WMM */
	if (!sband->vht_cap.vht_supported ||
4619 4620
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4621
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4622 4623
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4624 4625
			netdev_info(sdata->dev,
				    "disabling VHT as WMM/QoS is not supported by the AP\n");
4626 4627
	}

B
Ben Greear 已提交
4628 4629 4630 4631
	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));

4632 4633 4634 4635
	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));

4636
	if (req->ie && req->ie_len) {
J
Johannes Berg 已提交
4637 4638 4639
		memcpy(assoc_data->ie, req->ie, req->ie_len);
		assoc_data->ie_len = req->ie_len;
	}
4640

J
Johannes Berg 已提交
4641
	assoc_data->bss = req->bss;
4642

J
Johannes Berg 已提交
4643 4644
	if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
		if (ifmgd->powersave)
4645
			sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
J
Johannes Berg 已提交
4646
		else
4647
			sdata->smps_mode = IEEE80211_SMPS_OFF;
J
Johannes Berg 已提交
4648
	} else
4649
		sdata->smps_mode = ifmgd->req_smps;
J
Johannes Berg 已提交
4650

J
Johannes Berg 已提交
4651 4652 4653
	assoc_data->capability = req->bss->capability;
	assoc_data->supp_rates = bss->supp_rates;
	assoc_data->supp_rates_len = bss->supp_rates_len;
4654

4655
	rcu_read_lock();
4656 4657 4658 4659 4660
	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
4661
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4662 4663 4664 4665 4666 4667
	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;
4668
	rcu_read_unlock();
4669

K
Kalle Valo 已提交
4670
	if (bss->wmm_used && bss->uapsd_supported &&
4671
	    (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
4672
		assoc_data->uapsd = true;
K
Kalle Valo 已提交
4673 4674
		ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
	} else {
4675
		assoc_data->uapsd = false;
K
Kalle Valo 已提交
4676 4677 4678
		ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
	}

4679
	if (req->prev_bssid)
J
Johannes Berg 已提交
4680
		memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4681 4682 4683 4684 4685 4686 4687 4688 4689

	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;
	}

4690 4691 4692 4693 4694
	if (req->flags & ASSOC_REQ_USE_RRM)
		ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
	else
		ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;

4695 4696 4697 4698 4699
	if (req->crypto.control_port)
		ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
	else
		ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;

4700 4701
	sdata->control_port_protocol = req->crypto.control_port_ethertype;
	sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4702 4703
	sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
							sdata->vif.type);
4704

J
Johannes Berg 已提交
4705 4706 4707
	/* kick off associate process */

	ifmgd->assoc_data = assoc_data;
4708
	ifmgd->dtim_period = 0;
4709
	ifmgd->have_beacon = false;
J
Johannes Berg 已提交
4710

4711 4712 4713
	err = ieee80211_prep_connection(sdata, req->bss, true);
	if (err)
		goto err_clear;
J
Johannes Berg 已提交
4714

4715 4716
	rcu_read_lock();
	beacon_ies = rcu_dereference(req->bss->beacon_ies);
4717

4718 4719 4720 4721 4722 4723 4724 4725 4726
	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);
4727
		assoc_data->timeout_started = true;
4728 4729 4730 4731 4732
		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);
4733 4734
		u8 dtim_count = 0;

4735 4736 4737 4738
		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;
4739
			dtim_count = tim->dtim_count;
4740
		}
4741
		ifmgd->have_beacon = true;
J
Johannes Berg 已提交
4742
		assoc_data->timeout = jiffies;
4743
		assoc_data->timeout_started = true;
4744 4745 4746 4747 4748 4749 4750

		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;
		}
4751 4752
	} else {
		assoc_data->timeout = jiffies;
4753
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
4754
	}
4755 4756
	rcu_read_unlock();

4757
	run_again(sdata, assoc_data->timeout);
J
Johannes Berg 已提交
4758

P
Paul Stewart 已提交
4759 4760 4761 4762 4763 4764 4765 4766 4767 4768
	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
4769 4770
		sdata_info(sdata, "associating with AP with corrupt %s\n",
			   corrupt_type);
P
Paul Stewart 已提交
4771 4772
	}

4773
	return 0;
J
Johannes Berg 已提交
4774
 err_clear:
4775 4776
	memset(ifmgd->bssid, 0, ETH_ALEN);
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4777 4778 4779 4780
	ifmgd->assoc_data = NULL;
 err_free:
	kfree(assoc_data);
	return err;
4781 4782
}

4783
int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4784
			 struct cfg80211_deauth_request *req)
4785
{
4786
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4787
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4788
	bool tx = !req->local_state_change;
4789

4790 4791 4792 4793 4794 4795
	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));
4796

4797
		drv_mgd_prepare_tx(sdata->local, sdata);
4798 4799
		ieee80211_send_deauth_disassoc(sdata, req->bssid,
					       IEEE80211_STYPE_DEAUTH,
4800
					       req->reason_code, tx,
4801
					       frame_buf);
4802
		ieee80211_destroy_auth_data(sdata, false);
4803 4804
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
4805

4806
		return 0;
4807 4808
	}

4809 4810
	if (ifmgd->associated &&
	    ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4811 4812 4813 4814 4815
		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));

4816 4817
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       req->reason_code, tx, frame_buf);
4818 4819
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
4820 4821
		return 0;
	}
4822

4823
	return -ENOTCONN;
4824
}
4825

4826
int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4827
			   struct cfg80211_disassoc_request *req)
J
Johannes Berg 已提交
4828
{
4829
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4830
	u8 bssid[ETH_ALEN];
4831
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
J
Johannes Berg 已提交
4832

J
Johannes Berg 已提交
4833 4834 4835 4836 4837 4838
	/*
	 * 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.
	 */
4839
	if (ifmgd->associated != req->bss)
4840 4841
		return -ENOLINK;

J
Johannes Berg 已提交
4842
	sdata_info(sdata,
4843 4844
		   "disassociating from %pM by local choice (Reason: %u=%s)\n",
		   req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4845

4846
	memcpy(bssid, req->bss->bssid, ETH_ALEN);
4847 4848 4849
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
			       req->reason_code, !req->local_state_change,
			       frame_buf);
4850

4851 4852
	cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
			      IEEE80211_DEAUTH_FRAME_LEN);
4853

4854 4855
	return 0;
}
4856

4857
void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4858 4859 4860
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

4861 4862 4863 4864 4865 4866 4867 4868 4869 4870
	/*
	 * 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);
4871
	cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4872

4873
	sdata_lock(sdata);
4874 4875
	if (ifmgd->assoc_data) {
		struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4876
		ieee80211_destroy_assoc_data(sdata, false);
4877 4878
		cfg80211_assoc_timeout(sdata->dev, bss);
	}
4879 4880
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
4881 4882 4883 4884 4885 4886 4887
	spin_lock_bh(&ifmgd->teardown_lock);
	if (ifmgd->teardown_skb) {
		kfree_skb(ifmgd->teardown_skb);
		ifmgd->teardown_skb = NULL;
		ifmgd->orig_teardown_skb = NULL;
	}
	spin_unlock_bh(&ifmgd->teardown_lock);
4888
	del_timer_sync(&ifmgd->timer);
4889
	sdata_unlock(sdata);
4890 4891
}

4892 4893 4894 4895 4896 4897
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
4898 4899
	trace_api_cqm_rssi_notify(sdata, rssi_event);

4900 4901 4902
	cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
}
EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
4903 4904 4905 4906 4907 4908 4909 4910 4911 4912

void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

	trace_api_cqm_beacon_loss_notify(sdata->local, sdata);

	cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
}
EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);