mlme.c 137.8 KB
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/*
 * BSS client mode implementation
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 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
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 * Copyright 2004, Instant802 Networks, Inc.
 * Copyright 2005, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
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 * Copyright 2013-2014  Intel Mobile Communications GmbH
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 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

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#include <linux/delay.h>
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#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
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#include <linux/moduleparam.h>
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#include <linux/rtnetlink.h>
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#include <linux/pm_qos.h>
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#include <linux/crc32.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <net/mac80211.h>
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#include <asm/unaligned.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "rate.h"
#include "led.h"
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#define IEEE80211_AUTH_TIMEOUT		(HZ / 5)
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#define IEEE80211_AUTH_TIMEOUT_LONG	(HZ / 2)
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#define IEEE80211_AUTH_TIMEOUT_SHORT	(HZ / 10)
#define IEEE80211_AUTH_MAX_TRIES	3
#define IEEE80211_AUTH_WAIT_ASSOC	(HZ * 5)
#define IEEE80211_ASSOC_TIMEOUT		(HZ / 5)
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#define IEEE80211_ASSOC_TIMEOUT_LONG	(HZ / 2)
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#define IEEE80211_ASSOC_TIMEOUT_SHORT	(HZ / 10)
#define IEEE80211_ASSOC_MAX_TRIES	3
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static int max_nullfunc_tries = 2;
module_param(max_nullfunc_tries, int, 0644);
MODULE_PARM_DESC(max_nullfunc_tries,
		 "Maximum nullfunc tx tries before disconnecting (reason 4).");

static int max_probe_tries = 5;
module_param(max_probe_tries, int, 0644);
MODULE_PARM_DESC(max_probe_tries,
		 "Maximum probe tries before disconnecting (reason 4).");
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/*
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 * Beacon loss timeout is calculated as N frames times the
 * advertised beacon interval.  This may need to be somewhat
 * higher than what hardware might detect to account for
 * delays in the host processing frames. But since we also
 * probe on beacon miss before declaring the connection lost
 * default to what we want.
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 */
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static int beacon_loss_count = 7;
module_param(beacon_loss_count, int, 0644);
MODULE_PARM_DESC(beacon_loss_count,
		 "Number of beacon intervals before we decide beacon was lost.");
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/*
 * Time the connection can be idle before we probe
 * it to see if we can still talk to the AP.
 */
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#define IEEE80211_CONNECTION_IDLE_TIME	(30 * HZ)
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/*
 * Time we wait for a probe response after sending
 * a probe request because of beacon loss or for
 * checking the connection still works.
 */
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static int probe_wait_ms = 500;
module_param(probe_wait_ms, int, 0644);
MODULE_PARM_DESC(probe_wait_ms,
		 "Maximum time(ms) to wait for probe response"
		 " before disconnecting (reason 4).");
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/*
 * Weight given to the latest Beacon frame when calculating average signal
 * strength for Beacon frames received in the current BSS. This must be
 * between 1 and 15.
 */
#define IEEE80211_SIGNAL_AVE_WEIGHT	3

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/*
 * How many Beacon frames need to have been used in average signal strength
 * before starting to indicate signal change events.
 */
#define IEEE80211_SIGNAL_AVE_MIN_COUNT	4

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/*
 * We can have multiple work items (and connection probing)
 * scheduling this timer, but we need to take care to only
 * reschedule it when it should fire _earlier_ than it was
 * asked for before, or if it's not pending right now. This
 * function ensures that. Note that it then is required to
 * run this function for all timeouts after the first one
 * has happened -- the work that runs from this timer will
 * do that.
 */
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static void run_again(struct ieee80211_sub_if_data *sdata,
		      unsigned long timeout)
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{
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	sdata_assert_lock(sdata);
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	if (!timer_pending(&sdata->u.mgd.timer) ||
	    time_before(timeout, sdata->u.mgd.timer.expires))
		mod_timer(&sdata->u.mgd.timer, timeout);
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}

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

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

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

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

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

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	ifmgd->probe_send_count = 0;

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

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

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

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static u32
ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
			     struct ieee80211_supported_band *sband,
			     struct ieee80211_channel *channel,
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			     const struct ieee80211_ht_cap *ht_cap,
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			     const struct ieee80211_ht_operation *ht_oper,
			     const struct ieee80211_vht_operation *vht_oper,
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			     struct cfg80211_chan_def *chandef, bool tracking)
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{
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	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
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	struct cfg80211_chan_def vht_chandef;
	u32 ht_cfreq, ret;

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

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

	chandef->width = NL80211_CHAN_WIDTH_20;

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

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	ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
						  channel->band);
	/* check that channel matches the right operating channel */
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	if (!tracking && channel->center_freq != ht_cfreq) {
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		/*
		 * It's possible that some APs are confused here;
		 * Netgear WNDR3700 sometimes reports 4 higher than
		 * the actual channel in association responses, but
		 * since we look at probe response/beacon data here
		 * it should be OK.
		 */
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		sdata_info(sdata,
			   "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
			   channel->center_freq, ht_cfreq,
			   ht_oper->primary_chan, channel->band);
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		ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
		goto out;
	}

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

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

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

	switch (vht_oper->chan_width) {
	case IEEE80211_VHT_CHANWIDTH_USE_HT:
		vht_chandef.width = chandef->width;
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		vht_chandef.center_freq1 = chandef->center_freq1;
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		break;
	case IEEE80211_VHT_CHANWIDTH_80MHZ:
		vht_chandef.width = NL80211_CHAN_WIDTH_80;
		break;
	case IEEE80211_VHT_CHANWIDTH_160MHZ:
		vht_chandef.width = NL80211_CHAN_WIDTH_160;
		break;
	case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
		vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
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		vht_chandef.center_freq2 =
			ieee80211_channel_to_frequency(
				vht_oper->center_freq_seg2_idx,
				channel->band);
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		break;
	default:
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		if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
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			sdata_info(sdata,
				   "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
				   vht_oper->chan_width);
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		ret = IEEE80211_STA_DISABLE_VHT;
		goto out;
	}

	if (!cfg80211_chandef_valid(&vht_chandef)) {
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		if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
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			sdata_info(sdata,
				   "AP VHT information is invalid, disable VHT\n");
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		ret = IEEE80211_STA_DISABLE_VHT;
		goto out;
	}

	if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
		ret = 0;
		goto out;
	}

	if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
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		if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
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			sdata_info(sdata,
				   "AP VHT information doesn't match HT, disable VHT\n");
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		ret = IEEE80211_STA_DISABLE_VHT;
		goto out;
	}

	*chandef = vht_chandef;

	ret = 0;

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

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

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

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		ret |= ieee80211_chandef_downgrade(chandef);
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	}

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	if (chandef->width != vht_chandef.width && !tracking)
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		sdata_info(sdata,
			   "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");

	WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
	return ret;
}

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static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
			       struct sta_info *sta,
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			       const struct ieee80211_ht_cap *ht_cap,
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			       const struct ieee80211_ht_operation *ht_oper,
			       const struct ieee80211_vht_operation *vht_oper,
			       const u8 *bssid, u32 *changed)
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{
	struct ieee80211_local *local = sdata->local;
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	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
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	struct ieee80211_supported_band *sband;
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	struct ieee80211_channel *chan;
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	struct cfg80211_chan_def chandef;
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	u16 ht_opmode;
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	u32 flags;
	enum ieee80211_sta_rx_bandwidth new_sta_bw;
	int ret;
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	/* if HT was/is disabled, don't track any bandwidth changes */
	if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
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		return 0;

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	/* don't check VHT if we associated as non-VHT station */
	if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
		vht_oper = NULL;

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

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	/*
	 * if bss configuration changed store the new one -
	 * this may be applicable even if channel is identical
	 */
	ht_opmode = le16_to_cpu(ht_oper->operation_mode);
	if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
		*changed |= BSS_CHANGED_HT;
		sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
	}

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	chan = sdata->vif.bss_conf.chandef.chan;
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	sband = local->hw.wiphy->bands[chan->band];
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	/* calculate new channel (type) based on HT/VHT operation IEs */
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	flags = ieee80211_determine_chantype(sdata, sband, chan,
					     ht_cap, ht_oper, vht_oper,
					     &chandef, true);
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	/*
	 * Downgrade the new channel if we associated with restricted
	 * capabilities. For example, if we associated as a 20 MHz STA
	 * to a 40 MHz AP (due to regulatory, capabilities or config
	 * reasons) then switching to a 40 MHz channel now won't do us
	 * any good -- we couldn't use it with the AP.
	 */
	if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
	    chandef.width == NL80211_CHAN_WIDTH_80P80)
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		flags |= ieee80211_chandef_downgrade(&chandef);
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	if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
	    chandef.width == NL80211_CHAN_WIDTH_160)
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		flags |= ieee80211_chandef_downgrade(&chandef);
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	if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
	    chandef.width > NL80211_CHAN_WIDTH_20)
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		flags |= ieee80211_chandef_downgrade(&chandef);
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	if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
		return 0;

	sdata_info(sdata,
		   "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
		   ifmgd->bssid, chandef.chan->center_freq, chandef.width,
		   chandef.center_freq1, chandef.center_freq2);

	if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
				      IEEE80211_STA_DISABLE_VHT |
				      IEEE80211_STA_DISABLE_40MHZ |
				      IEEE80211_STA_DISABLE_80P80MHZ |
				      IEEE80211_STA_DISABLE_160MHZ)) ||
	    !cfg80211_chandef_valid(&chandef)) {
		sdata_info(sdata,
			   "AP %pM changed bandwidth in a way we can't support - disconnect\n",
			   ifmgd->bssid);
		return -EINVAL;
	}

	switch (chandef.width) {
	case NL80211_CHAN_WIDTH_20_NOHT:
	case NL80211_CHAN_WIDTH_20:
		new_sta_bw = IEEE80211_STA_RX_BW_20;
		break;
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	case NL80211_CHAN_WIDTH_40:
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		new_sta_bw = IEEE80211_STA_RX_BW_40;
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		break;
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	case NL80211_CHAN_WIDTH_80:
		new_sta_bw = IEEE80211_STA_RX_BW_80;
		break;
	case NL80211_CHAN_WIDTH_80P80:
	case NL80211_CHAN_WIDTH_160:
		new_sta_bw = IEEE80211_STA_RX_BW_160;
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		break;
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	default:
		return -EINVAL;
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	}
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	if (new_sta_bw > sta->cur_max_bandwidth)
		new_sta_bw = sta->cur_max_bandwidth;
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	if (new_sta_bw < sta->sta.bandwidth) {
		sta->sta.bandwidth = new_sta_bw;
		rate_control_rate_update(local, sband, sta,
					 IEEE80211_RC_BW_CHANGED);
	}
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	ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
	if (ret) {
		sdata_info(sdata,
			   "AP %pM changed bandwidth to incompatible one - disconnect\n",
			   ifmgd->bssid);
		return ret;
	}
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	if (new_sta_bw > sta->sta.bandwidth) {
		sta->sta.bandwidth = new_sta_bw;
		rate_control_rate_update(local, sband, sta,
					 IEEE80211_RC_BW_CHANGED);
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	}
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	return 0;
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}

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/* frame sending functions */

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static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
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				struct sk_buff *skb, u8 ap_ht_param,
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				struct ieee80211_supported_band *sband,
				struct ieee80211_channel *channel,
				enum ieee80211_smps_mode smps)
{
	u8 *pos;
	u32 flags = channel->flags;
	u16 cap;
	struct ieee80211_sta_ht_cap ht_cap;

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

	memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
	ieee80211_apply_htcap_overrides(sdata, &ht_cap);

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

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	switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
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	case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
		if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
			cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
			cap &= ~IEEE80211_HT_CAP_SGI_40;
		}
		break;
	case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
		if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
			cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
			cap &= ~IEEE80211_HT_CAP_SGI_40;
		}
		break;
	}

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	/*
	 * If 40 MHz was disabled associate as though we weren't
	 * capable of 40 MHz -- some broken APs will never fall
	 * back to trying to transmit in 20 MHz.
	 */
	if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
		cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
		cap &= ~IEEE80211_HT_CAP_SGI_40;
	}

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	/* set SM PS mode properly */
	cap &= ~IEEE80211_HT_CAP_SM_PS;
	switch (smps) {
	case IEEE80211_SMPS_AUTOMATIC:
	case IEEE80211_SMPS_NUM_MODES:
		WARN_ON(1);
	case IEEE80211_SMPS_OFF:
		cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
			IEEE80211_HT_CAP_SM_PS_SHIFT;
		break;
	case IEEE80211_SMPS_STATIC:
		cap |= WLAN_HT_CAP_SM_PS_STATIC <<
			IEEE80211_HT_CAP_SM_PS_SHIFT;
		break;
	case IEEE80211_SMPS_DYNAMIC:
		cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
			IEEE80211_HT_CAP_SM_PS_SHIFT;
		break;
	}

	/* reserve and fill IE */
	pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
	ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
}

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static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
				 struct sk_buff *skb,
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				 struct ieee80211_supported_band *sband,
				 struct ieee80211_vht_cap *ap_vht_cap)
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{
	u8 *pos;
	u32 cap;
	struct ieee80211_sta_vht_cap vht_cap;
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	u32 mask, ap_bf_sts, our_bf_sts;
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	BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));

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

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

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	if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
		cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
		cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
	}

	if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
		cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
		cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
	}

564 565 566 567 568 569 570 571
	/*
	 * Some APs apparently get confused if our capabilities are better
	 * than theirs, so restrict what we advertise in the assoc request.
	 */
	if (!(ap_vht_cap->vht_cap_info &
			cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
		cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;

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

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

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

582
	/* reserve and fill IE */
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	pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
584 585 586
	ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
}

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static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u8 *pos, qos_info;
	size_t offset = 0, noffset;
596
	int i, count, rates_len, supp_rates_len, shift;
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	u16 capab;
	struct ieee80211_supported_band *sband;
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	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
601
	u32 rate_flags, rates = 0;
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603
	sdata_assert_lock(sdata);
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	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (WARN_ON(!chanctx_conf)) {
		rcu_read_unlock();
		return;
	}
611
	chan = chanctx_conf->def.chan;
612
	rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
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	rcu_read_unlock();
	sband = local->hw.wiphy->bands[chan->band];
615
	shift = ieee80211_vif_get_shift(&sdata->vif);
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	if (assoc_data->supp_rates_len) {
		/*
		 * Get all rates supported by the device and the AP as
		 * some APs don't like getting a superset of their rates
		 * in the association request (e.g. D-Link DAP 1353 in
		 * b-only mode)...
		 */
624 625 626 627
		rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
						     assoc_data->supp_rates,
						     assoc_data->supp_rates_len,
						     &rates);
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	} else {
		/*
		 * In case AP not provide any supported rates information
		 * before association, we send information element(s) with
		 * all rates that we support.
		 */
634 635 636 637 638 639 640 641
		rates_len = 0;
		for (i = 0; i < sband->n_bitrates; i++) {
			if ((rate_flags & sband->bitrates[i].flags)
			    != rate_flags)
				continue;
			rates |= BIT(i);
			rates_len++;
		}
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	}

	skb = alloc_skb(local->hw.extra_tx_headroom +
			sizeof(*mgmt) + /* bit too much but doesn't matter */
			2 + assoc_data->ssid_len + /* SSID */
			4 + rates_len + /* (extended) rates */
			4 + /* power capability */
			2 + 2 * sband->n_channels + /* supported channels */
			2 + sizeof(struct ieee80211_ht_cap) + /* HT */
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			2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
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			assoc_data->ie_len + /* extra IEs */
			9, /* WMM */
			GFP_KERNEL);
	if (!skb)
		return;

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

	capab = WLAN_CAPABILITY_ESS;

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

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

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

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

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	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
	memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);

	if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
		skb_put(skb, 10);
		mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						  IEEE80211_STYPE_REASSOC_REQ);
		mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
		mgmt->u.reassoc_req.listen_interval =
				cpu_to_le16(local->hw.conf.listen_interval);
		memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
		       ETH_ALEN);
	} else {
		skb_put(skb, 4);
		mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						  IEEE80211_STYPE_ASSOC_REQ);
		mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
		mgmt->u.assoc_req.listen_interval =
				cpu_to_le16(local->hw.conf.listen_interval);
	}

	/* SSID */
	pos = skb_put(skb, 2 + assoc_data->ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = assoc_data->ssid_len;
	memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);

	/* add all rates which were marked to be used above */
	supp_rates_len = rates_len;
	if (supp_rates_len > 8)
		supp_rates_len = 8;

	pos = skb_put(skb, supp_rates_len + 2);
	*pos++ = WLAN_EID_SUPP_RATES;
	*pos++ = supp_rates_len;

	count = 0;
	for (i = 0; i < sband->n_bitrates; i++) {
		if (BIT(i) & rates) {
721 722 723
			int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
						5 * (1 << shift));
			*pos++ = (u8) rate;
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			if (++count == 8)
				break;
		}
	}

	if (rates_len > count) {
		pos = skb_put(skb, rates_len - count + 2);
		*pos++ = WLAN_EID_EXT_SUPP_RATES;
		*pos++ = rates_len - count;

		for (i++; i < sband->n_bitrates; i++) {
			if (BIT(i) & rates) {
736 737 738 739
				int rate;
				rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
						    5 * (1 << shift));
				*pos++ = (u8) rate;
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			}
		}
	}

744 745
	if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
	    capab & WLAN_CAPABILITY_RADIO_MEASURE) {
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		pos = skb_put(skb, 4);
		*pos++ = WLAN_EID_PWR_CAPABILITY;
		*pos++ = 2;
		*pos++ = 0; /* min tx power */
750 751
		 /* max tx power */
		*pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
752
	}
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754
	if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
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		/* TODO: get this in reg domain format */
		pos = skb_put(skb, 2 * sband->n_channels + 2);
		*pos++ = WLAN_EID_SUPPORTED_CHANNELS;
		*pos++ = 2 * sband->n_channels;
		for (i = 0; i < sband->n_channels; i++) {
			*pos++ = ieee80211_frequency_to_channel(
					sband->channels[i].center_freq);
			*pos++ = 1; /* one channel in the subband*/
		}
	}

	/* if present, add any custom IEs that go before HT */
767
	if (assoc_data->ie_len) {
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		static const u8 before_ht[] = {
			WLAN_EID_SSID,
			WLAN_EID_SUPP_RATES,
			WLAN_EID_EXT_SUPP_RATES,
			WLAN_EID_PWR_CAPABILITY,
			WLAN_EID_SUPPORTED_CHANNELS,
			WLAN_EID_RSN,
			WLAN_EID_QOS_CAPA,
			WLAN_EID_RRM_ENABLED_CAPABILITIES,
			WLAN_EID_MOBILITY_DOMAIN,
778 779
			WLAN_EID_FAST_BSS_TRANSITION,	/* reassoc only */
			WLAN_EID_RIC_DATA,		/* reassoc only */
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			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
		};
782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801
		static const u8 after_ric[] = {
			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
			WLAN_EID_HT_CAPABILITY,
			WLAN_EID_BSS_COEX_2040,
			WLAN_EID_EXT_CAPABILITY,
			WLAN_EID_QOS_TRAFFIC_CAPA,
			WLAN_EID_TIM_BCAST_REQ,
			WLAN_EID_INTERWORKING,
			/* 60GHz doesn't happen right now */
			WLAN_EID_VHT_CAPABILITY,
			WLAN_EID_OPMODE_NOTIF,
		};

		noffset = ieee80211_ie_split_ric(assoc_data->ie,
						 assoc_data->ie_len,
						 before_ht,
						 ARRAY_SIZE(before_ht),
						 after_ric,
						 ARRAY_SIZE(after_ric),
						 offset);
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		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
		offset = noffset;
	}

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

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

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

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

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	/* if present, add any custom non-vendor IEs that go after HT */
850
	if (assoc_data->ie_len) {
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		noffset = ieee80211_ie_split_vendor(assoc_data->ie,
						    assoc_data->ie_len,
						    offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
		offset = noffset;
	}

859 860
	if (assoc_data->wmm) {
		if (assoc_data->uapsd) {
861 862
			qos_info = ifmgd->uapsd_queues;
			qos_info |= (ifmgd->uapsd_max_sp_len <<
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				     IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
		} else {
			qos_info = 0;
		}

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

	/* add any remaining custom (i.e. vendor specific here) IEs */
872
	if (assoc_data->ie_len) {
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		noffset = assoc_data->ie_len;
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
	}

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	drv_mgd_prepare_tx(local, sdata);

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	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
881 882 883
	if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
						IEEE80211_TX_INTFL_MLME_CONN_TX;
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	ieee80211_tx_skb(sdata, skb);
}

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

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

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

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

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

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

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

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

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

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

929
	ieee80211_tx_skb(sdata, skb);
930 931
}

932 933 934 935 936 937 938 939 940 941 942
static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
					  struct ieee80211_sub_if_data *sdata)
{
	struct sk_buff *skb;
	struct ieee80211_hdr *nullfunc;
	__le16 fc;

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

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
943
	if (!skb)
944
		return;
945

946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961
	skb_reserve(skb, local->hw.extra_tx_headroom);

	nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
	memset(nullfunc, 0, 30);
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
			 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
	nullfunc->frame_control = fc;
	memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
	memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
	memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
	memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);

	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
}

962 963 964 965 966
/* spectrum management related things */
static void ieee80211_chswitch_work(struct work_struct *work)
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
967
	struct ieee80211_local *local = sdata->local;
968
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
969
	int ret;
970

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

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

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

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

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

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

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

		goto out;
	}

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

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

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

	ieee80211_sta_reset_beacon_monitor(sdata);
	ieee80211_sta_reset_conn_monitor(sdata);

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

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

	sdata_assert_lock(sdata);

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

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

1052 1053
	cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);

1054 1055 1056
	sdata->vif.csa_active = false;
	ifmgd->csa_waiting_bcn = false;

1057 1058 1059 1060 1061 1062
	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);
1063
		return;
1064
	}
1065 1066
}

1067 1068
void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
{
J
Johannes Berg 已提交
1069 1070
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1071 1072 1073

	trace_api_chswitch_done(sdata, success);
	if (!success) {
1074 1075 1076 1077 1078 1079
		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);
1080 1081 1082 1083
	}
}
EXPORT_SYMBOL(ieee80211_chswitch_done);

1084 1085 1086 1087
static void ieee80211_chswitch_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
1088

1089
	ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1090 1091
}

1092
static void
J
Johannes Berg 已提交
1093
ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1094 1095
				 u64 timestamp, u32 device_timestamp,
				 struct ieee802_11_elems *elems,
1096
				 bool beacon)
1097
{
1098
	struct ieee80211_local *local = sdata->local;
1099
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1100
	struct cfg80211_bss *cbss = ifmgd->associated;
1101
	struct ieee80211_chanctx_conf *conf;
J
Johannes Berg 已提交
1102
	struct ieee80211_chanctx *chanctx;
1103
	enum ieee80211_band current_band;
1104
	struct ieee80211_csa_ie csa_ie;
1105
	struct ieee80211_channel_switch ch_switch;
1106
	int res;
1107

1108
	sdata_assert_lock(sdata);
1109

1110
	if (!cbss)
1111 1112
		return;

1113
	if (local->scanning)
1114 1115
		return;

1116
	/* disregard subsequent announcements if we are already processing */
1117
	if (sdata->vif.csa_active)
1118 1119
		return;

1120
	current_band = cbss->channel->band;
1121
	memset(&csa_ie, 0, sizeof(csa_ie));
1122 1123
	res = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, current_band,
					   ifmgd->flags,
1124
					   ifmgd->associated->bssid, &csa_ie);
1125
	if (res	< 0)
1126
		ieee80211_queue_work(&local->hw,
1127
				     &ifmgd->csa_connection_drop_work);
1128
	if (res)
1129
		return;
1130

1131
	if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1132 1133 1134
				     IEEE80211_CHAN_DISABLED)) {
		sdata_info(sdata,
			   "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1135
			   ifmgd->associated->bssid,
1136 1137 1138
			   csa_ie.chandef.chan->center_freq,
			   csa_ie.chandef.width, csa_ie.chandef.center_freq1,
			   csa_ie.chandef.center_freq2);
1139 1140 1141 1142 1143
		ieee80211_queue_work(&local->hw,
				     &ifmgd->csa_connection_drop_work);
		return;
	}

1144
	mutex_lock(&local->mtx);
1145
	mutex_lock(&local->chanctx_mtx);
1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159
	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);

1160 1161 1162 1163 1164 1165 1166 1167 1168
	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
1169 1170
	}

1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186
	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;
	}

1187 1188 1189
	res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
					    chanctx->mode, false);
	if (res) {
J
Johannes Berg 已提交
1190
		sdata_info(sdata,
1191 1192
			   "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
			   res);
1193
		ieee80211_queue_work(&local->hw,
J
Johannes Berg 已提交
1194
				     &ifmgd->csa_connection_drop_work);
1195
		mutex_unlock(&local->chanctx_mtx);
1196
		mutex_unlock(&local->mtx);
J
Johannes Berg 已提交
1197 1198
		return;
	}
1199
	mutex_unlock(&local->chanctx_mtx);
J
Johannes Berg 已提交
1200

1201
	sdata->vif.csa_active = true;
1202
	sdata->csa_chandef = csa_ie.chandef;
1203
	sdata->csa_block_tx = csa_ie.mode;
J
Johannes Berg 已提交
1204

1205
	if (sdata->csa_block_tx)
1206 1207
		ieee80211_stop_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
1208
	mutex_unlock(&local->mtx);
1209

1210 1211 1212
	cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
					  csa_ie.count);

1213
	if (local->ops->channel_switch) {
1214
		/* use driver's channel switch callback */
1215
		drv_channel_switch(local, sdata, &ch_switch);
1216 1217 1218 1219
		return;
	}

	/* channel switch handled in software */
1220
	if (csa_ie.count <= 1)
1221
		ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1222
	else
1223
		mod_timer(&ifmgd->chswitch_timer,
1224
			  TU_TO_EXP_TIME(csa_ie.count * cbss->beacon_interval));
1225 1226
}

1227 1228 1229 1230 1231 1232
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)
1233
{
1234 1235
	struct ieee80211_country_ie_triplet *triplet;
	int chan = ieee80211_frequency_to_channel(channel->center_freq);
1236
	int i, chan_increment;
1237
	bool have_chan_pwr = false;
1238

1239 1240
	/* Invalid IE */
	if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1241
		return false;
1242

1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256
	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;
1257
	}
1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268

	/* 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;
1269
				*chan_pwr = triplet->chans.max_power;
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280
				break;
			}
		}
		if (have_chan_pwr)
			break;

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

1281 1282 1283 1284 1285
	if (have_chan_pwr)
		*pwr_reduction = *pwr_constr_elem;
	return have_chan_pwr;
}

1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299
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];
}

1300 1301 1302 1303
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,
1304 1305
				       const u8 *pwr_constr_ie,
				       const u8 *cisco_dtpc_ie)
1306
{
1307 1308 1309
	bool has_80211h_pwr = false, has_cisco_pwr = false;
	int chan_pwr = 0, pwr_reduction_80211h = 0;
	int pwr_level_cisco, pwr_level_80211h;
1310
	int new_ap_level;
1311

1312 1313 1314 1315 1316 1317
	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);
1318 1319 1320 1321 1322 1323 1324 1325
		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;
1326
	}
1327

1328
	if (!has_80211h_pwr && !has_cisco_pwr)
1329
		return 0;
1330

1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346
	/* 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;
	}
1347

1348 1349
	if (sdata->ap_power_level == new_ap_level)
		return 0;
1350

1351 1352 1353 1354
	sdata->ap_power_level = new_ap_level;
	if (__ieee80211_recalc_txpower(sdata))
		return BSS_CHANGED_TXPOWER;
	return 0;
1355 1356
}

1357 1358 1359 1360 1361 1362
/* 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
1363 1364 1365 1366
	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
1367
	if (local->scanning)
J
Johannes Berg 已提交
1368 1369
		return;

1370 1371 1372 1373 1374 1375 1376
	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);
1377

1378 1379 1380 1381 1382 1383
		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);
1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400
	}
}

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);
	}
}

1401 1402 1403 1404
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
1405
	bool authorized = false;
1406 1407 1408 1409

	if (!mgd->powersave)
		return false;

1410 1411 1412
	if (mgd->broken_ap)
		return false;

1413 1414 1415
	if (!mgd->associated)
		return false;

1416
	if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1417 1418
		return false;

1419
	if (!mgd->have_beacon)
1420 1421
		return false;

1422 1423 1424
	rcu_read_lock();
	sta = sta_info_get(sdata, mgd->bssid);
	if (sta)
J
Johannes Berg 已提交
1425
		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1426 1427
	rcu_read_unlock();

J
Johannes Berg 已提交
1428
	return authorized;
1429 1430
}

1431
/* need to hold RTNL or interface lock */
1432
void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1433 1434 1435
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;
1436
	int timeout;
1437 1438 1439 1440 1441 1442 1443

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

	list_for_each_entry(sdata, &local->interfaces, list) {
1444
		if (!ieee80211_sdata_running(sdata))
1445
			continue;
1446 1447 1448 1449 1450 1451 1452 1453
		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;
		}
1454 1455 1456 1457 1458 1459
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

1460
	if (count == 1 && ieee80211_powersave_allowed(found)) {
1461 1462 1463
		s32 beaconint_us;

		if (latency < 0)
M
Mark Gross 已提交
1464
			latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1465 1466 1467 1468

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

1469
		timeout = local->dynamic_ps_forced_timeout;
1470 1471
		if (timeout < 0) {
			/*
1472 1473
			 * Go to full PSM if the user configures a very low
			 * latency requirement.
1474 1475 1476
			 * The 2000 second value is there for compatibility
			 * until the PM_QOS_NETWORK_LATENCY is configured
			 * with real values.
1477
			 */
1478 1479
			if (latency > (1900 * USEC_PER_MSEC) &&
			    latency != (2000 * USEC_PER_SEC))
1480
				timeout = 0;
1481 1482
			else
				timeout = 100;
1483
		}
1484
		local->hw.conf.dynamic_ps_timeout = timeout;
1485

1486
		if (beaconint_us > latency) {
1487
			local->ps_sdata = NULL;
1488 1489
		} else {
			int maxslp = 1;
1490
			u8 dtimper = found->u.mgd.dtim_period;
1491 1492 1493 1494 1495

			/* If the TIM IE is invalid, pretend the value is 1 */
			if (!dtimper)
				dtimper = 1;
			else if (dtimper > 1)
1496 1497 1498
				maxslp = min_t(int, dtimper,
						    latency / beaconint_us);

1499
			local->hw.conf.max_sleep_period = maxslp;
1500
			local->hw.conf.ps_dtim_period = dtimper;
1501
			local->ps_sdata = found;
1502
		}
1503
	} else {
1504
		local->ps_sdata = NULL;
1505
	}
1506 1507 1508 1509

	ieee80211_change_ps(local);
}

E
Eliad Peller 已提交
1510 1511 1512 1513 1514 1515 1516 1517 1518 1519
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);
	}
}

1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531
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,
1532
					IEEE80211_MAX_QUEUE_MAP,
1533 1534
					IEEE80211_QUEUE_STOP_REASON_PS,
					false);
1535 1536 1537 1538 1539 1540 1541 1542
}

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;
1543
	struct ieee80211_if_managed *ifmgd;
1544 1545
	unsigned long flags;
	int q;
1546 1547 1548 1549 1550

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

1551 1552
	ifmgd = &sdata->u.mgd;

1553 1554 1555
	if (local->hw.conf.flags & IEEE80211_CONF_PS)
		return;

1556
	if (local->hw.conf.dynamic_ps_timeout > 0) {
1557 1558
		/* don't enter PS if TX frames are pending */
		if (drv_tx_frames_pending(local)) {
1559 1560 1561 1562 1563
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
			return;
		}
1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581

		/*
		 * 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);
1582 1583
	}

1584
	if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1585
	    !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1586
		if (drv_tx_frames_pending(local)) {
1587 1588 1589
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
1590
		} else {
1591 1592
			ieee80211_send_nullfunc(local, sdata, 1);
			/* Flush to get the tx status of nullfunc frame */
1593
			ieee80211_flush_queues(local, sdata);
1594
		}
1595 1596
	}

1597 1598
	if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
	      (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1599 1600 1601 1602 1603
	    (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);
	}
1604 1605 1606 1607 1608 1609
}

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

1610
	if (local->quiescing || local->suspended)
1611 1612
		return;

1613
	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1614 1615
}

1616 1617 1618 1619 1620 1621 1622
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);
1623
	struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1624

1625 1626 1627 1628 1629 1630 1631 1632
	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);
1633 1634
}

1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723
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
1724
/* MLME */
1725
static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1726
				     struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
1727
				     const u8 *wmm_param, size_t wmm_param_len)
1728 1729
{
	struct ieee80211_tx_queue_params params;
1730
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1731 1732
	size_t left;
	int count;
J
Johannes Berg 已提交
1733 1734
	const u8 *pos;
	u8 uapsd_queues = 0;
1735

1736
	if (!local->ops->conf_tx)
1737
		return false;
1738

J
Johannes Berg 已提交
1739
	if (local->hw.queues < IEEE80211_NUM_ACS)
1740
		return false;
1741 1742

	if (!wmm_param)
1743
		return false;
1744

1745
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1746
		return false;
K
Kalle Valo 已提交
1747 1748

	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1749
		uapsd_queues = ifmgd->uapsd_queues;
K
Kalle Valo 已提交
1750

1751
	count = wmm_param[6] & 0x0f;
1752
	if (count == ifmgd->wmm_last_param_set)
1753
		return false;
1754
	ifmgd->wmm_last_param_set = count;
1755 1756 1757 1758 1759 1760

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

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

Y
Yoni Divinsky 已提交
1761
	sdata->wmm_acm = 0;
1762 1763 1764
	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
1765
		bool uapsd = false;
1766 1767 1768
		int queue;

		switch (aci) {
1769
		case 1: /* AC_BK */
J
Johannes Berg 已提交
1770
			queue = 3;
J
Johannes Berg 已提交
1771
			if (acm)
Y
Yoni Divinsky 已提交
1772
				sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
K
Kalle Valo 已提交
1773 1774
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
				uapsd = true;
1775
			break;
1776
		case 2: /* AC_VI */
J
Johannes Berg 已提交
1777
			queue = 1;
J
Johannes Berg 已提交
1778
			if (acm)
Y
Yoni Divinsky 已提交
1779
				sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
K
Kalle Valo 已提交
1780 1781
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
				uapsd = true;
1782
			break;
1783
		case 3: /* AC_VO */
J
Johannes Berg 已提交
1784
			queue = 0;
J
Johannes Berg 已提交
1785
			if (acm)
Y
Yoni Divinsky 已提交
1786
				sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
K
Kalle Valo 已提交
1787 1788
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
				uapsd = true;
1789
			break;
1790
		case 0: /* AC_BE */
1791
		default:
J
Johannes Berg 已提交
1792
			queue = 2;
J
Johannes Berg 已提交
1793
			if (acm)
Y
Yoni Divinsky 已提交
1794
				sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
K
Kalle Valo 已提交
1795 1796
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
				uapsd = true;
1797 1798 1799 1800 1801 1802
			break;
		}

		params.aifs = pos[0] & 0x0f;
		params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params.cw_min = ecw2cw(pos[1] & 0x0f);
1803
		params.txop = get_unaligned_le16(pos + 2);
1804
		params.acm = acm;
K
Kalle Valo 已提交
1805 1806
		params.uapsd = uapsd;

J
Johannes Berg 已提交
1807
		mlme_dbg(sdata,
1808
			 "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
1809 1810
			 queue, aci, acm,
			 params.aifs, params.cw_min, params.cw_max,
1811 1812
			 params.txop, params.uapsd,
			 ifmgd->tx_tspec[queue].downgraded);
1813
		sdata->tx_conf[queue] = params;
1814 1815
		if (!ifmgd->tx_tspec[queue].downgraded &&
		    drv_conf_tx(local, sdata, queue, &params))
J
Johannes Berg 已提交
1816 1817 1818
			sdata_err(sdata,
				  "failed to set TX queue parameters for queue %d\n",
				  queue);
1819
	}
1820 1821

	/* enable WMM or activate new settings */
1822
	sdata->vif.bss_conf.qos = true;
1823
	return true;
1824 1825
}

1826 1827 1828 1829
static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
{
	lockdep_assert_held(&sdata->local->mtx);

1830
	sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1831 1832 1833 1834 1835 1836 1837 1838 1839 1840
	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
1841 1842
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
1843
{
J
Johannes Berg 已提交
1844
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1845
	u32 changed = 0;
J
Johannes Berg 已提交
1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858
	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
1859
	if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1860
		use_short_slot = true;
1861

1862 1863 1864
	if (use_protection != bss_conf->use_cts_prot) {
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
1865
	}
1866

1867 1868
	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
1869
		changed |= BSS_CHANGED_ERP_PREAMBLE;
1870
	}
1871

J
Johannes Berg 已提交
1872 1873 1874
	if (use_short_slot != bss_conf->use_short_slot) {
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
1875 1876 1877 1878 1879
	}

	return changed;
}

1880
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1881
				     struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
1882
				     u32 bss_info_changed)
1883
{
1884
	struct ieee80211_bss *bss = (void *)cbss->priv;
1885
	struct ieee80211_local *local = sdata->local;
1886
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1887

J
Johannes Berg 已提交
1888
	bss_info_changed |= BSS_CHANGED_ASSOC;
1889
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1890
		bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1891

1892
	sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1893
		beacon_loss_count * bss_conf->beacon_int));
1894

1895 1896
	sdata->u.mgd.associated = cbss;
	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1897

1898 1899
	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;

1900
	if (sdata->vif.p2p) {
1901
		const struct cfg80211_bss_ies *ies;
1902

1903 1904 1905 1906 1907 1908 1909 1910
		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
1911 1912
					(u8 *) &bss_conf->p2p_noa_attr,
					sizeof(bss_conf->p2p_noa_attr));
1913
			if (ret >= 2) {
J
Janusz Dziedzic 已提交
1914 1915
				sdata->u.mgd.p2p_noa_index =
					bss_conf->p2p_noa_attr.index;
1916 1917
				bss_info_changed |= BSS_CHANGED_P2P_PS;
			}
1918
		}
1919
		rcu_read_unlock();
1920 1921
	}

J
Johannes Berg 已提交
1922
	/* just to be sure */
1923
	ieee80211_stop_poll(sdata);
J
Johannes Berg 已提交
1924

1925
	ieee80211_led_assoc(local, 1);
1926

1927
	if (sdata->u.mgd.have_beacon) {
1928 1929 1930 1931 1932 1933 1934
		/*
		 * 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;
1935
		bss_conf->beacon_rate = bss->beacon_rate;
1936
		bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1937
	} else {
1938
		bss_conf->beacon_rate = NULL;
1939
		bss_conf->dtim_period = 0;
1940
	}
1941

1942
	bss_conf->assoc = 1;
1943

1944
	/* Tell the driver to monitor connection quality (if supported) */
1945
	if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1946
	    bss_conf->cqm_rssi_thold)
1947 1948
		bss_info_changed |= BSS_CHANGED_CQM;

1949
	/* Enable ARP filtering */
1950
	if (bss_conf->arp_addr_cnt)
1951 1952
		bss_info_changed |= BSS_CHANGED_ARP_FILTER;

J
Johannes Berg 已提交
1953
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1954

J
Johannes Berg 已提交
1955 1956 1957
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
	mutex_unlock(&local->iflist_mtx);
1958

1959
	ieee80211_recalc_smps(sdata);
E
Eliad Peller 已提交
1960 1961
	ieee80211_recalc_ps_vif(sdata);

1962
	netif_carrier_on(sdata->dev);
1963 1964
}

1965
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1966 1967
				   u16 stype, u16 reason, bool tx,
				   u8 *frame_buf)
1968
{
1969
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1970
	struct ieee80211_local *local = sdata->local;
1971
	u32 changed = 0;
1972

1973
	sdata_assert_lock(sdata);
1974

1975 1976 1977
	if (WARN_ON_ONCE(tx && !frame_buf))
		return;

J
Johannes Berg 已提交
1978 1979 1980
	if (WARN_ON(!ifmgd->associated))
		return;

1981 1982
	ieee80211_stop_poll(sdata);

1983
	ifmgd->associated = NULL;
1984 1985
	netif_carrier_off(sdata->dev);

1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996
	/*
	 * 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
1997 1998 1999
	/* disable per-vif ps */
	ieee80211_recalc_ps_vif(sdata);

2000 2001
	/* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
	if (tx)
2002
		ieee80211_flush_queues(local, sdata);
2003

2004 2005
	/* deauthenticate/disassociate now */
	if (tx || frame_buf)
2006 2007
		ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
					       reason, tx, frame_buf);
2008 2009 2010

	/* flush out frame */
	if (tx)
2011
		ieee80211_flush_queues(local, sdata);
2012

2013 2014 2015
	/* clear bssid only after building the needed mgmt frames */
	memset(ifmgd->bssid, 0, ETH_ALEN);

2016
	/* remove AP and TDLS peers */
2017
	sta_info_flush(sdata);
2018 2019

	/* finally reset all BSS / config parameters */
2020 2021 2022
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
J
Johannes Berg 已提交
2023 2024
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
2025

J
Janusz Dziedzic 已提交
2026 2027 2028
	ifmgd->p2p_noa_index = -1;
	memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
	       sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2029

2030
	/* on the next assoc, re-program HT/VHT parameters */
B
Ben Greear 已提交
2031 2032
	memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
	memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2033 2034
	memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
	memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2035

2036
	sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2037

2038 2039 2040
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

2041
	/* Disable ARP filtering */
2042
	if (sdata->vif.bss_conf.arp_addr_cnt)
2043 2044
		changed |= BSS_CHANGED_ARP_FILTER;

2045 2046 2047
	sdata->vif.bss_conf.qos = false;
	changed |= BSS_CHANGED_QOS;

2048 2049
	/* The BSSID (not really interesting) and HT changed */
	changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
J
Johannes Berg 已提交
2050
	ieee80211_bss_info_change_notify(sdata, changed);
2051

2052 2053 2054
	/* disassociated - set to defaults now */
	ieee80211_set_wmm_default(sdata, false);

2055 2056 2057 2058
	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);
2059

2060
	sdata->vif.bss_conf.dtim_period = 0;
2061 2062
	sdata->vif.bss_conf.beacon_rate = NULL;

2063
	ifmgd->have_beacon = false;
2064

2065
	ifmgd->flags = 0;
2066
	mutex_lock(&local->mtx);
2067
	ieee80211_vif_release_channel(sdata);
2068 2069

	sdata->vif.csa_active = false;
2070
	ifmgd->csa_waiting_bcn = false;
2071 2072 2073 2074 2075
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
2076
	mutex_unlock(&local->mtx);
2077

2078 2079 2080 2081
	/* existing TX TSPEC sessions no longer exist */
	memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
	cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);

2082
	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2083
}
2084

2085 2086 2087 2088 2089 2090 2091 2092
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
2093 2094
	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
2095
	 */
J
Johannes Berg 已提交
2096 2097 2098
	if (is_multicast_ether_addr(hdr->addr1))
		return;

2099
	ieee80211_sta_reset_conn_monitor(sdata);
2100
}
2101

2102 2103 2104
static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2105
	struct ieee80211_local *local = sdata->local;
2106

2107
	mutex_lock(&local->mtx);
2108 2109
	if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
		goto out;
2110

2111
	__ieee80211_stop_poll(sdata);
2112 2113 2114 2115

	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
	mutex_unlock(&local->iflist_mtx);
2116 2117

	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
2118
		goto out;
2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129

	/*
	 * 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));
2130 2131
out:
	mutex_unlock(&local->mtx);
2132 2133
}

2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168
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);
	}
}

2169
void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2170
			     struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2171
{
2172 2173
	ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);

F
Felix Fietkau 已提交
2174
	if (!ieee80211_is_data(hdr->frame_control))
2175 2176 2177 2178
	    return;

	if (ieee80211_is_nullfunc(hdr->frame_control) &&
	    sdata->u.mgd.probe_send_count > 0) {
2179
		if (ack)
2180
			ieee80211_sta_reset_conn_monitor(sdata);
2181 2182
		else
			sdata->u.mgd.nullfunc_failed = true;
2183
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2184
		return;
2185
	}
2186 2187 2188

	if (ack)
		ieee80211_sta_reset_conn_monitor(sdata);
2189 2190
}

2191 2192 2193 2194
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ssid;
2195
	u8 *dst = ifmgd->associated->bssid;
2196
	u8 unicast_limit = max(1, max_probe_tries - 3);
2197 2198 2199 2200 2201 2202 2203 2204

	/*
	 * 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;
2205

2206 2207 2208 2209 2210 2211 2212
	/*
	 * 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.
	 */
2213 2214
	ifmgd->probe_send_count++;

2215 2216
	if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
		ifmgd->nullfunc_failed = false;
2217
		ieee80211_send_nullfunc(sdata->local, sdata, 0);
2218
	} else {
2219 2220
		int ssid_len;

2221
		rcu_read_lock();
2222
		ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2223 2224 2225 2226 2227 2228
		if (WARN_ON_ONCE(ssid == NULL))
			ssid_len = 0;
		else
			ssid_len = ssid[1];

		ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
2229
					 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
2230
					 ifmgd->associated->channel, false);
2231
		rcu_read_unlock();
2232
	}
2233

2234
	ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2235
	run_again(sdata, ifmgd->probe_timeout);
2236 2237
}

J
Johannes Berg 已提交
2238 2239
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
				   bool beacon)
2240 2241
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
2242
	bool already = false;
2243

2244
	if (!ieee80211_sdata_running(sdata))
2245 2246
		return;

2247
	sdata_lock(sdata);
2248 2249 2250 2251

	if (!ifmgd->associated)
		goto out;

2252 2253 2254 2255 2256 2257 2258
	mutex_lock(&sdata->local->mtx);

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

2259
	if (beacon) {
J
Johannes Berg 已提交
2260
		mlme_dbg_ratelimited(sdata,
2261 2262
				     "detected beacon loss from AP (missed %d beacons) - probing\n",
				     beacon_loss_count);
J
Johannes Berg 已提交
2263

2264 2265 2266 2267
		ieee80211_cqm_rssi_notify(&sdata->vif,
					  NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
					  GFP_KERNEL);
	}
2268

J
Johannes Berg 已提交
2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279
	/*
	 * 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!
	 */
2280
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
J
Johannes Berg 已提交
2281 2282
		already = true;

E
Eliad Peller 已提交
2283 2284
	ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;

2285 2286
	mutex_unlock(&sdata->local->mtx);

J
Johannes Berg 已提交
2287 2288 2289
	if (already)
		goto out;

2290 2291 2292 2293
	mutex_lock(&sdata->local->iflist_mtx);
	ieee80211_recalc_ps(sdata->local, -1);
	mutex_unlock(&sdata->local->iflist_mtx);

2294 2295
	ifmgd->probe_send_count = 0;
	ieee80211_mgd_probe_ap_send(sdata);
2296
 out:
2297
	sdata_unlock(sdata);
2298 2299
}

2300 2301 2302 2303 2304
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;
2305
	struct cfg80211_bss *cbss;
2306 2307
	struct sk_buff *skb;
	const u8 *ssid;
2308
	int ssid_len;
2309 2310 2311 2312

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

2313
	sdata_assert_lock(sdata);
2314

2315 2316 2317 2318 2319 2320 2321
	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
2322 2323
		return NULL;

2324
	rcu_read_lock();
2325
	ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2326 2327 2328 2329 2330
	if (WARN_ON_ONCE(ssid == NULL))
		ssid_len = 0;
	else
		ssid_len = ssid[1];

2331
	skb = ieee80211_build_probe_req(sdata, cbss->bssid,
J
Johannes Berg 已提交
2332
					(u32) -1, cbss->channel,
2333
					ssid + 2, ssid_len,
2334
					NULL, 0, true);
2335
	rcu_read_unlock();
2336 2337 2338 2339 2340

	return skb;
}
EXPORT_SYMBOL(ieee80211_ap_probereq_get);

2341
static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2342
{
2343
	struct ieee80211_local *local = sdata->local;
2344
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2345
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2346

2347
	sdata_lock(sdata);
2348
	if (!ifmgd->associated) {
2349
		sdata_unlock(sdata);
2350 2351 2352
		return;
	}

2353 2354
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
			       WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2355
			       true, frame_buf);
2356
	mutex_lock(&local->mtx);
2357
	sdata->vif.csa_active = false;
2358
	ifmgd->csa_waiting_bcn = false;
2359 2360 2361 2362 2363
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
2364
	mutex_unlock(&local->mtx);
2365

2366 2367
	cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
			      IEEE80211_DEAUTH_FRAME_LEN);
2368
	sdata_unlock(sdata);
2369 2370
}

2371
static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
J
Johannes Berg 已提交
2372 2373 2374
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
2375
			     u.mgd.beacon_connection_loss_work);
2376 2377 2378 2379
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct sta_info *sta;

	if (ifmgd->associated) {
2380
		rcu_read_lock();
2381 2382 2383
		sta = sta_info_get(sdata, ifmgd->bssid);
		if (sta)
			sta->beacon_loss_count++;
2384
		rcu_read_unlock();
2385
	}
J
Johannes Berg 已提交
2386

2387
	if (ifmgd->connection_loss) {
2388 2389
		sdata_info(sdata, "Connection to AP %pM lost\n",
			   ifmgd->bssid);
2390
		__ieee80211_disconnect(sdata);
2391
	} else {
2392
		ieee80211_mgd_probe_ap(sdata, true);
2393 2394 2395 2396 2397 2398 2399 2400 2401
	}
}

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);

2402
	__ieee80211_disconnect(sdata);
J
Johannes Berg 已提交
2403 2404
}

2405 2406 2407
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2408
	struct ieee80211_hw *hw = &sdata->local->hw;
2409

J
Johannes Berg 已提交
2410 2411
	trace_api_beacon_loss(sdata);

2412
	sdata->u.mgd.connection_loss = false;
2413
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2414 2415 2416
}
EXPORT_SYMBOL(ieee80211_beacon_loss);

2417 2418 2419 2420 2421
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
2422 2423
	trace_api_connection_loss(sdata);

2424
	sdata->u.mgd.connection_loss = true;
2425 2426 2427 2428 2429
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_connection_loss);


J
Johannes Berg 已提交
2430 2431 2432 2433 2434
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;

2435
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2436 2437 2438 2439 2440 2441

	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);
2442
		sdata->u.mgd.flags = 0;
2443
		mutex_lock(&sdata->local->mtx);
J
Johannes Berg 已提交
2444
		ieee80211_vif_release_channel(sdata);
2445
		mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
2446 2447
	}

2448
	cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
J
Johannes Berg 已提交
2449 2450 2451 2452 2453 2454 2455
	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)
{
2456
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
2457 2458 2459
	struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
	u8 *pos;
	struct ieee802_11_elems elems;
2460
	u32 tx_flags = 0;
J
Johannes Berg 已提交
2461 2462

	pos = mgmt->u.auth.variable;
2463
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2464 2465 2466
	if (!elems.challenge)
		return;
	auth_data->expected_transaction = 4;
J
Johannes Berg 已提交
2467
	drv_mgd_prepare_tx(sdata->local, sdata);
2468 2469 2470
	if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
		tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
			   IEEE80211_TX_INTFL_MLME_CONN_TX;
2471
	ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
J
Johannes Berg 已提交
2472 2473 2474
			    elems.challenge - 2, elems.challenge_len + 2,
			    auth_data->bss->bssid, auth_data->bss->bssid,
			    auth_data->key, auth_data->key_len,
2475
			    auth_data->key_idx, tx_flags);
J
Johannes Berg 已提交
2476 2477
}

2478 2479
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
2480 2481 2482 2483 2484 2485
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u8 bssid[ETH_ALEN];
	u16 auth_alg, auth_transaction, status_code;
	struct sta_info *sta;

2486
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2487 2488

	if (len < 24 + 6)
2489
		return;
J
Johannes Berg 已提交
2490 2491

	if (!ifmgd->auth_data || ifmgd->auth_data->done)
2492
		return;
J
Johannes Berg 已提交
2493 2494 2495

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

2496
	if (!ether_addr_equal(bssid, mgmt->bssid))
2497
		return;
J
Johannes Berg 已提交
2498 2499 2500 2501 2502 2503

	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 ||
2504 2505 2506 2507 2508
	    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);
2509
		return;
2510
	}
J
Johannes Berg 已提交
2511 2512

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
2513 2514
		sdata_info(sdata, "%pM denied authentication (status %d)\n",
			   mgmt->sa, status_code);
2515
		ieee80211_destroy_auth_data(sdata, false);
2516
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2517
		return;
J
Johannes Berg 已提交
2518 2519 2520 2521 2522 2523
	}

	switch (ifmgd->auth_data->algorithm) {
	case WLAN_AUTH_OPEN:
	case WLAN_AUTH_LEAP:
	case WLAN_AUTH_FT:
2524
	case WLAN_AUTH_SAE:
J
Johannes Berg 已提交
2525 2526 2527 2528 2529
		break;
	case WLAN_AUTH_SHARED_KEY:
		if (ifmgd->auth_data->expected_transaction != 4) {
			ieee80211_auth_challenge(sdata, mgmt, len);
			/* need another frame */
2530
			return;
J
Johannes Berg 已提交
2531 2532 2533 2534 2535
		}
		break;
	default:
		WARN_ONCE(1, "invalid auth alg %d",
			  ifmgd->auth_data->algorithm);
2536
		return;
J
Johannes Berg 已提交
2537 2538
	}

J
Johannes Berg 已提交
2539
	sdata_info(sdata, "authenticated\n");
J
Johannes Berg 已提交
2540 2541
	ifmgd->auth_data->done = true;
	ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2542
	ifmgd->auth_data->timeout_started = true;
2543
	run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
2544

2545 2546 2547 2548 2549 2550
	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.
		 */
2551
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2552
		return;
2553 2554
	}

J
Johannes Berg 已提交
2555 2556 2557 2558 2559 2560 2561 2562
	/* 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
2563
		sdata_info(sdata, "failed moving %pM to auth\n", bssid);
J
Johannes Berg 已提交
2564 2565 2566 2567
		goto out_err;
	}
	mutex_unlock(&sdata->local->sta_mtx);

2568
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2569
	return;
J
Johannes Berg 已提交
2570 2571 2572 2573 2574
 out_err:
	mutex_unlock(&sdata->local->sta_mtx);
	/* ignore frame -- wait for timeout */
}

2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630
#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
2631

2632 2633
static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
2634
{
2635
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2636
	const u8 *bssid = NULL;
2637 2638
	u16 reason_code;

2639
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2640

2641
	if (len < 24 + 2)
2642
		return;
2643

J
Johannes Berg 已提交
2644
	if (!ifmgd->associated ||
2645
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2646
		return;
2647

2648
	bssid = ifmgd->associated->bssid;
2649 2650 2651

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

2652 2653
	sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
		   bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
2654

2655 2656
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2657
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2658 2659 2660
}


2661 2662
static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_mgmt *mgmt, size_t len)
2663
{
2664
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2665 2666
	u16 reason_code;

2667
	sdata_assert_lock(sdata);
2668

J
Johannes Berg 已提交
2669
	if (len < 24 + 2)
2670
		return;
2671

J
Johannes Berg 已提交
2672
	if (!ifmgd->associated ||
2673
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2674
		return;
2675 2676 2677

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

J
Johannes Berg 已提交
2678 2679
	sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
		   mgmt->sa, reason_code);
2680

2681 2682
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2683
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2684 2685
}

2686 2687 2688 2689
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,
2690 2691
				int *min_rate, int *min_rate_index,
				int shift, u32 rate_flags)
2692 2693 2694 2695
{
	int i, j;

	for (i = 0; i < supp_rates_len; i++) {
2696
		int rate = supp_rates[i] & 0x7f;
2697 2698
		bool is_basic = !!(supp_rates[i] & 0x80);

2699
		if ((rate * 5 * (1 << shift)) > 110)
2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714
			*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++) {
2715 2716 2717 2718 2719 2720 2721 2722 2723
			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) {
2724 2725 2726
				*rates |= BIT(j);
				if (is_basic)
					*basic_rates |= BIT(j);
2727 2728
				if ((rate * 5) < *min_rate) {
					*min_rate = rate * 5;
2729 2730 2731 2732 2733 2734 2735
					*min_rate_index = j;
				}
				break;
			}
		}
	}
}
2736

J
Johannes Berg 已提交
2737 2738 2739 2740 2741
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;

2742
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2743 2744 2745 2746 2747 2748

	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);
2749
		sdata->u.mgd.flags = 0;
2750
		mutex_lock(&sdata->local->mtx);
J
Johannes Berg 已提交
2751
		ieee80211_vif_release_channel(sdata);
2752
		mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
2753 2754 2755 2756 2757 2758 2759 2760
	}

	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
2761
				    struct ieee80211_mgmt *mgmt, size_t len)
2762
{
2763
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2764
	struct ieee80211_local *local = sdata->local;
2765
	struct ieee80211_supported_band *sband;
2766
	struct sta_info *sta;
J
Johannes Berg 已提交
2767 2768
	u8 *pos;
	u16 capab_info, aid;
2769
	struct ieee802_11_elems elems;
J
Johannes Berg 已提交
2770
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2771 2772
	const struct cfg80211_bss_ies *bss_ies = NULL;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
J
Johannes Berg 已提交
2773
	u32 changed = 0;
2774
	int err;
2775
	bool ret;
2776

J
Johannes Berg 已提交
2777
	/* AssocResp and ReassocResp have identical structure */
2778 2779

	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
J
Johannes Berg 已提交
2780
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2781

2782
	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
J
Johannes Berg 已提交
2783 2784
		sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
			   aid);
2785 2786
	aid &= ~(BIT(15) | BIT(14));

2787 2788 2789
	ifmgd->broken_ap = false;

	if (aid == 0 || aid > IEEE80211_MAX_AID) {
J
Johannes Berg 已提交
2790 2791
		sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
			   aid);
2792 2793 2794 2795
		aid = 0;
		ifmgd->broken_ap = true;
	}

J
Johannes Berg 已提交
2796
	pos = mgmt->u.assoc_resp.variable;
2797
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2798

2799
	if (!elems.supp_rates) {
J
Johannes Berg 已提交
2800
		sdata_info(sdata, "no SuppRates element in AssocResp\n");
J
Johannes Berg 已提交
2801
		return false;
2802 2803
	}

2804
	ifmgd->aid = aid;
2805

2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868
	/*
	 * 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");
		}
	}

2869 2870 2871 2872 2873 2874 2875
	/*
	 * 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,
2876 2877 2878
			   "HT AP is missing WMM params or HT capability/operation\n");
		ret = false;
		goto out;
2879 2880 2881 2882 2883
	}

	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    (!elems.vht_cap_elem || !elems.vht_operation)) {
		sdata_info(sdata,
2884 2885 2886
			   "VHT AP is missing VHT capability/operation\n");
		ret = false;
		goto out;
2887 2888
	}

2889 2890 2891 2892 2893
	mutex_lock(&sdata->local->sta_mtx);
	/*
	 * station info was already allocated and inserted before
	 * the association and should be available to us
	 */
2894
	sta = sta_info_get(sdata, cbss->bssid);
2895 2896
	if (WARN_ON(!sta)) {
		mutex_unlock(&sdata->local->sta_mtx);
2897 2898
		ret = false;
		goto out;
2899
	}
2900

J
Johannes Berg 已提交
2901
	sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2902

2903
	/* Set up internal HT/VHT capabilities */
2904
	if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
B
Ben Greear 已提交
2905
		ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2906
						  elems.ht_cap_elem, sta);
2907

M
Mahesh Palivela 已提交
2908 2909
	if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
		ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2910
						    elems.vht_cap_elem, sta);
M
Mahesh Palivela 已提交
2911

2912 2913 2914 2915 2916 2917
	/*
	 * 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.
	 */
2918

2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933
	/*
	 * 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;
	}

2934
	rate_control_rate_init(sta);
2935

2936
	if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
J
Johannes Berg 已提交
2937
		set_sta_flag(sta, WLAN_STA_MFP);
2938

2939
	sta->sta.wme = elems.wmm_param;
2940

2941
	err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2942 2943 2944
	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
2945 2946 2947
		sdata_info(sdata,
			   "failed to move station %pM to desired state\n",
			   sta->sta.addr);
2948 2949
		WARN_ON(__sta_info_destroy(sta));
		mutex_unlock(&sdata->local->sta_mtx);
2950 2951
		ret = false;
		goto out;
2952 2953
	}

2954
	mutex_unlock(&sdata->local->sta_mtx);
2955

2956 2957 2958 2959 2960 2961 2962 2963
	/*
	 * 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;

2964
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2965
		ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
J
Johannes Berg 已提交
2966
					 elems.wmm_param_len);
2967
	else
2968 2969
		ieee80211_set_wmm_default(sdata, false);
	changed |= BSS_CHANGED_QOS;
2970

J
Johannes Berg 已提交
2971 2972 2973 2974
	/* set AID and assoc capability,
	 * ieee80211_set_associated() will tell the driver */
	bss_conf->aid = aid;
	bss_conf->assoc_capability = capab_info;
2975
	ieee80211_set_associated(sdata, cbss, changed);
2976

2977 2978 2979 2980 2981 2982 2983
	/*
	 * 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);

2984
	/*
J
Johannes Berg 已提交
2985 2986
	 * Start timer to probe the connection to the AP now.
	 * Also start the timer that will detect beacon loss.
2987
	 */
J
Johannes Berg 已提交
2988
	ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2989
	ieee80211_sta_reset_beacon_monitor(sdata);
2990

2991 2992 2993 2994
	ret = true;
 out:
	kfree(bss_ies);
	return ret;
2995 2996
}

2997 2998 2999
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
3000 3001 3002 3003 3004
{
	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;
3005
	int ac, uapsd_queues = -1;
J
Johannes Berg 已提交
3006 3007
	u8 *pos;
	bool reassoc;
3008
	struct cfg80211_bss *bss;
J
Johannes Berg 已提交
3009

3010
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3011 3012

	if (!assoc_data)
3013
		return;
3014
	if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3015
		return;
J
Johannes Berg 已提交
3016 3017 3018 3019 3020 3021 3022

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

	if (len < 24 + 6)
3023
		return;
J
Johannes Berg 已提交
3024 3025 3026 3027 3028 3029

	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
3030 3031 3032 3033
	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
3034 3035

	pos = mgmt->u.assoc_resp.variable;
3036
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
3037 3038

	if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3039 3040
	    elems.timeout_int &&
	    elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
J
Johannes Berg 已提交
3041
		u32 tu, ms;
3042
		tu = le32_to_cpu(elems.timeout_int->value);
J
Johannes Berg 已提交
3043
		ms = tu * 1024 / 1000;
J
Johannes Berg 已提交
3044 3045 3046
		sdata_info(sdata,
			   "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
			   mgmt->sa, tu, ms);
J
Johannes Berg 已提交
3047
		assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3048
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
3049
		if (ms > IEEE80211_ASSOC_TIMEOUT)
3050 3051
			run_again(sdata, assoc_data->timeout);
		return;
J
Johannes Berg 已提交
3052 3053
	}

3054
	bss = assoc_data->bss;
J
Johannes Berg 已提交
3055 3056

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
3057 3058
		sdata_info(sdata, "%pM denied association (code=%d)\n",
			   mgmt->sa, status_code);
J
Johannes Berg 已提交
3059 3060
		ieee80211_destroy_assoc_data(sdata, false);
	} else {
3061
		if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
J
Johannes Berg 已提交
3062
			/* oops -- internal error -- send timeout for now */
3063
			ieee80211_destroy_assoc_data(sdata, false);
3064
			cfg80211_assoc_timeout(sdata->dev, bss);
3065
			return;
J
Johannes Berg 已提交
3066
		}
3067
		sdata_info(sdata, "associated\n");
3068 3069 3070 3071 3072 3073 3074

		/*
		 * 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);
3075 3076 3077 3078 3079 3080

		/* 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
3081 3082
	}

3083
	cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
J
Johannes Berg 已提交
3084
}
J
Johannes Berg 已提交
3085

3086
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
3087
				  struct ieee80211_mgmt *mgmt, size_t len,
3088
				  struct ieee80211_rx_status *rx_status,
3089
				  struct ieee802_11_elems *elems)
3090 3091
{
	struct ieee80211_local *local = sdata->local;
3092
	struct ieee80211_bss *bss;
3093
	struct ieee80211_channel *channel;
3094

3095
	sdata_assert_lock(sdata);
3096

3097 3098
	channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
	if (!channel)
3099 3100 3101
		return;

	bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3102
					channel);
3103 3104
	if (bss) {
		sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3105
		ieee80211_rx_bss_put(local, bss);
3106
	}
3107 3108 3109
}


3110
static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
3111
					 struct sk_buff *skb)
3112
{
J
Johannes Berg 已提交
3113
	struct ieee80211_mgmt *mgmt = (void *)skb->data;
3114
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
3115 3116
	struct ieee80211_rx_status *rx_status = (void *) skb->cb;
	size_t baselen, len = skb->len;
3117 3118
	struct ieee802_11_elems elems;

3119 3120
	ifmgd = &sdata->u.mgd;

3121
	sdata_assert_lock(sdata);
3122

3123
	if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3124 3125
		return; /* ignore ProbeResp to foreign address */

3126 3127 3128 3129 3130
	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
	if (baselen > len)
		return;

	ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3131
			       false, &elems);
3132

3133
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3134

3135
	if (ifmgd->associated &&
3136
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3137
		ieee80211_reset_ap_probe(sdata);
J
Johannes Berg 已提交
3138 3139

	if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
3140
	    ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
J
Johannes Berg 已提交
3141
		/* got probe response, continue with auth */
J
Johannes Berg 已提交
3142
		sdata_info(sdata, "direct probe responded\n");
J
Johannes Berg 已提交
3143 3144
		ifmgd->auth_data->tries = 0;
		ifmgd->auth_data->timeout = jiffies;
3145
		ifmgd->auth_data->timeout_started = true;
3146
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
3147
	}
3148 3149
}

3150 3151 3152
/*
 * This is the canonical list of information elements we care about,
 * the filter code also gives us all changes to the Microsoft OUI
3153 3154 3155
 * (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.
3156 3157 3158 3159 3160 3161 3162 3163 3164 3165
 *
 * 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 =
3166 3167 3168 3169 3170
	(1ULL << WLAN_EID_COUNTRY) |
	(1ULL << WLAN_EID_ERP_INFO) |
	(1ULL << WLAN_EID_CHANNEL_SWITCH) |
	(1ULL << WLAN_EID_PWR_CONSTRAINT) |
	(1ULL << WLAN_EID_HT_CAPABILITY) |
3171
	(1ULL << WLAN_EID_HT_OPERATION);
3172

3173 3174 3175
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)
3176
{
3177
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3178
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3179 3180
	size_t baselen;
	struct ieee802_11_elems elems;
3181
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
3182 3183
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
3184
	struct sta_info *sta;
3185
	u32 changed = 0;
3186
	bool erp_valid;
J
Johannes Berg 已提交
3187
	u8 erp_value = 0;
3188
	u32 ncrc;
3189
	u8 *bssid;
3190
	u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3191

3192
	sdata_assert_lock(sdata);
3193

3194 3195 3196
	/* Process beacon from the current BSS */
	baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
	if (baselen > len)
3197
		return;
3198

J
Johannes Berg 已提交
3199 3200 3201 3202
	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		rcu_read_unlock();
3203
		return;
J
Johannes Berg 已提交
3204 3205
	}

3206
	if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
J
Johannes Berg 已提交
3207
		rcu_read_unlock();
3208
		return;
J
Johannes Berg 已提交
3209
	}
3210
	chan = chanctx_conf->def.chan;
J
Johannes Berg 已提交
3211
	rcu_read_unlock();
3212

3213
	if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3214
	    ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
J
Johannes Berg 已提交
3215
		ieee802_11_parse_elems(mgmt->u.beacon.variable,
3216
				       len - baselen, false, &elems);
3217

3218
		ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3219 3220 3221 3222
		if (elems.tim && !elems.parse_error) {
			const struct ieee80211_tim_ie *tim_ie = elems.tim;
			ifmgd->dtim_period = tim_ie->dtim_period;
		}
3223
		ifmgd->have_beacon = true;
3224
		ifmgd->assoc_data->need_beacon = false;
3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235
		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
3236 3237
		/* continue assoc process */
		ifmgd->assoc_data->timeout = jiffies;
3238
		ifmgd->assoc_data->timeout_started = true;
3239 3240
		run_again(sdata, ifmgd->assoc_data->timeout);
		return;
J
Johannes Berg 已提交
3241
	}
3242

J
Johannes Berg 已提交
3243
	if (!ifmgd->associated ||
3244
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3245
		return;
J
Johannes Berg 已提交
3246
	bssid = ifmgd->associated->bssid;
3247

3248 3249 3250 3251
	/* 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;
3252
		ifmgd->ave_beacon_signal = rx_status->signal * 16;
3253
		ifmgd->last_cqm_event_signal = 0;
3254
		ifmgd->count_beacon_signal = 1;
3255
		ifmgd->last_ave_beacon_signal = 0;
3256 3257 3258 3259 3260
	} else {
		ifmgd->ave_beacon_signal =
			(IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
			 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
			 ifmgd->ave_beacon_signal) / 16;
3261
		ifmgd->count_beacon_signal++;
3262
	}
3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275

	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;
3276
			drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
3277 3278 3279 3280
		} else if (sig < ifmgd->rssi_min_thold &&
			   (last_sig >= ifmgd->rssi_max_thold ||
			   last_sig == 0)) {
			ifmgd->last_ave_beacon_signal = sig;
3281
			drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
3282 3283 3284
		}
	}

3285
	if (bss_conf->cqm_rssi_thold &&
3286
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3287
	    !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308
		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);
		}
	}

3309
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
J
Johannes Berg 已提交
3310
		mlme_dbg_ratelimited(sdata,
3311
				     "cancelling AP probe due to a received beacon\n");
3312
		ieee80211_reset_ap_probe(sdata);
3313 3314
	}

J
Johannes Berg 已提交
3315 3316 3317 3318
	/*
	 * Push the beacon loss detection into the future since
	 * we are processing a beacon from the AP just now.
	 */
3319
	ieee80211_sta_reset_beacon_monitor(sdata);
J
Johannes Berg 已提交
3320

3321 3322
	ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
	ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3323
					  len - baselen, false, &elems,
3324 3325
					  care_about_ies, ncrc);

3326
	if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3327 3328 3329
		bool directed_tim = ieee80211_check_tim(elems.tim,
							elems.tim_len,
							ifmgd->aid);
3330
		if (directed_tim) {
3331
			if (local->hw.conf.dynamic_ps_timeout > 0) {
3332 3333 3334 3335 3336
				if (local->hw.conf.flags & IEEE80211_CONF_PS) {
					local->hw.conf.flags &= ~IEEE80211_CONF_PS;
					ieee80211_hw_config(local,
							    IEEE80211_CONF_CHANGE_PS);
				}
3337
				ieee80211_send_nullfunc(local, sdata, 0);
3338
			} else if (!local->pspolling && sdata->u.mgd.powersave) {
3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350
				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);
			}
3351 3352
		}
	}
J
Johannes Berg 已提交
3353

3354
	if (sdata->vif.p2p) {
J
Janusz Dziedzic 已提交
3355
		struct ieee80211_p2p_noa_attr noa = {};
3356 3357 3358 3359 3360
		int ret;

		ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
					    len - baselen,
					    IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3361
					    (u8 *) &noa, sizeof(noa));
J
Janusz Dziedzic 已提交
3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377
		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));
3378 3379 3380 3381 3382
			changed |= BSS_CHANGED_P2P_PS;
			ifmgd->beacon_crc_valid = false;
		}
	}

3383 3384 3385
	if (ifmgd->csa_waiting_bcn)
		ieee80211_chswitch_post_beacon(sdata);

3386
	if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3387
		return;
3388
	ifmgd->beacon_crc = ncrc;
3389
	ifmgd->beacon_crc_valid = true;
3390

3391
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3392

3393
	ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3394
					 rx_status->device_timestamp,
3395 3396
					 &elems, true);

3397 3398
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
	    ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3399 3400 3401
				     elems.wmm_param_len))
		changed |= BSS_CHANGED_QOS;

3402 3403
	/*
	 * If we haven't had a beacon before, tell the driver about the
3404
	 * DTIM period (and beacon timing if desired) now.
3405
	 */
3406
	if (!ifmgd->have_beacon) {
3407 3408 3409 3410 3411
		/* 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;
3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424

		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;
		}

3425 3426
		changed |= BSS_CHANGED_BEACON_INFO;
		ifmgd->have_beacon = true;
3427 3428 3429 3430 3431

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

3432
		ieee80211_recalc_ps_vif(sdata);
3433 3434
	}

3435
	if (elems.erp_info) {
J
Johannes Berg 已提交
3436 3437 3438 3439
		erp_valid = true;
		erp_value = elems.erp_info[0];
	} else {
		erp_valid = false;
3440
	}
J
Johannes Berg 已提交
3441 3442 3443
	changed |= ieee80211_handle_bss_capability(sdata,
			le16_to_cpu(mgmt->u.beacon.capab_info),
			erp_valid, erp_value);
3444

3445
	mutex_lock(&local->sta_mtx);
3446 3447
	sta = sta_info_get(sdata, bssid);

3448 3449
	if (ieee80211_config_bw(sdata, sta,
				elems.ht_cap_elem, elems.ht_operation,
3450 3451 3452 3453 3454
				elems.vht_operation, bssid, &changed)) {
		mutex_unlock(&local->sta_mtx);
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_DEAUTH_LEAVING,
				       true, deauth_buf);
3455 3456
		cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
				      sizeof(deauth_buf));
3457
		return;
3458
	}
3459 3460 3461 3462

	if (sta && elems.opmode_notif)
		ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
					    rx_status->band, true);
3463
	mutex_unlock(&local->sta_mtx);
3464

3465 3466 3467
	changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
					       elems.country_elem,
					       elems.country_elem_len,
3468 3469
					       elems.pwr_constr_elem,
					       elems.cisco_dtpc_elem);
3470

3471
	ieee80211_bss_info_change_notify(sdata, changed);
3472 3473
}

3474 3475
void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
				  struct sk_buff *skb)
3476 3477 3478 3479
{
	struct ieee80211_rx_status *rx_status;
	struct ieee80211_mgmt *mgmt;
	u16 fc;
3480 3481
	struct ieee802_11_elems elems;
	int ies_len;
3482 3483 3484 3485 3486

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

3487
	sdata_lock(sdata);
3488

J
Johannes Berg 已提交
3489 3490
	switch (fc & IEEE80211_FCTL_STYPE) {
	case IEEE80211_STYPE_BEACON:
3491
		ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
J
Johannes Berg 已提交
3492 3493 3494 3495 3496
		break;
	case IEEE80211_STYPE_PROBE_RESP:
		ieee80211_rx_mgmt_probe_resp(sdata, skb);
		break;
	case IEEE80211_STYPE_AUTH:
3497
		ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3498 3499
		break;
	case IEEE80211_STYPE_DEAUTH:
3500
		ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3501 3502
		break;
	case IEEE80211_STYPE_DISASSOC:
3503
		ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3504 3505 3506
		break;
	case IEEE80211_STYPE_ASSOC_RESP:
	case IEEE80211_STYPE_REASSOC_RESP:
3507
		ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3508 3509
		break;
	case IEEE80211_STYPE_ACTION:
3510
		if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3511 3512 3513
			ies_len = skb->len -
				  offsetof(struct ieee80211_mgmt,
					   u.action.u.chan_switch.variable);
3514 3515 3516 3517 3518 3519

			if (ies_len < 0)
				break;

			ieee802_11_parse_elems(
				mgmt->u.action.u.chan_switch.variable,
3520
				ies_len, true, &elems);
3521 3522 3523 3524

			if (elems.parse_error)
				break;

3525
			ieee80211_sta_process_chanswitch(sdata,
3526 3527 3528
						 rx_status->mactime,
						 rx_status->device_timestamp,
						 &elems, false);
3529 3530 3531 3532 3533 3534 3535 3536 3537 3538
		} 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,
3539
				ies_len, true, &elems);
3540 3541 3542 3543 3544 3545 3546 3547

			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
3548
			ieee80211_sta_process_chanswitch(sdata,
3549 3550 3551
						 rx_status->mactime,
						 rx_status->device_timestamp,
						 &elems, false);
3552
		}
3553
		break;
3554
	}
3555
	sdata_unlock(sdata);
3556 3557
}

J
Johannes Berg 已提交
3558
static void ieee80211_sta_timer(unsigned long data)
3559
{
J
Johannes Berg 已提交
3560 3561
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
3562

3563
	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3564 3565
}

3566
static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3567
					  u8 *bssid, u8 reason, bool tx)
3568
{
3569
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3570

3571
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3572
			       tx, frame_buf);
3573

3574 3575
	cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
			      IEEE80211_DEAUTH_FRAME_LEN);
3576 3577
}

J
Johannes Berg 已提交
3578 3579 3580 3581 3582
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;
3583
	u32 tx_flags = 0;
J
Johannes Berg 已提交
3584

3585
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3586 3587 3588 3589 3590 3591 3592

	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
3593 3594
		sdata_info(sdata, "authentication with %pM timed out\n",
			   auth_data->bss->bssid);
J
Johannes Berg 已提交
3595 3596 3597 3598 3599 3600 3601 3602 3603 3604

		/*
		 * 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
3605 3606
	drv_mgd_prepare_tx(local, sdata);

J
Johannes Berg 已提交
3607
	if (auth_data->bss->proberesp_ies) {
3608 3609 3610
		u16 trans = 1;
		u16 status = 0;

J
Johannes Berg 已提交
3611 3612 3613
		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
3614 3615

		auth_data->expected_transaction = 2;
3616 3617 3618 3619 3620 3621 3622

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

3623 3624 3625 3626
		if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
			tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
				   IEEE80211_TX_INTFL_MLME_CONN_TX;

3627 3628
		ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
				    auth_data->data, auth_data->data_len,
J
Johannes Berg 已提交
3629
				    auth_data->bss->bssid,
3630 3631
				    auth_data->bss->bssid, NULL, 0, 0,
				    tx_flags);
J
Johannes Berg 已提交
3632 3633 3634
	} else {
		const u8 *ssidie;

J
Johannes Berg 已提交
3635 3636 3637
		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
3638

3639
		rcu_read_lock();
J
Johannes Berg 已提交
3640
		ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3641 3642
		if (!ssidie) {
			rcu_read_unlock();
J
Johannes Berg 已提交
3643
			return -EINVAL;
3644
		}
J
Johannes Berg 已提交
3645 3646 3647 3648 3649
		/*
		 * Direct probe is sent to broadcast address as some APs
		 * will not answer to direct packet in unassociated state.
		 */
		ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3650
					 NULL, 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
3651
					 auth_data->bss->channel, false);
3652
		rcu_read_unlock();
J
Johannes Berg 已提交
3653 3654
	}

3655
	if (tx_flags == 0) {
3656
		auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3657
		auth_data->timeout_started = true;
3658
		run_again(sdata, auth_data->timeout);
3659
	} else {
3660 3661 3662 3663
		auth_data->timeout =
			round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
		auth_data->timeout_started = true;
		run_again(sdata, auth_data->timeout);
3664
	}
J
Johannes Berg 已提交
3665 3666 3667 3668 3669 3670 3671 3672 3673

	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;

3674
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3675 3676 3677

	assoc_data->tries++;
	if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
J
Johannes Berg 已提交
3678 3679
		sdata_info(sdata, "association with %pM timed out\n",
			   assoc_data->bss->bssid);
J
Johannes Berg 已提交
3680 3681 3682 3683 3684 3685 3686 3687 3688 3689

		/*
		 * 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
3690 3691 3692
	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
3693 3694
	ieee80211_send_assoc(sdata);

3695 3696
	if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
		assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3697
		assoc_data->timeout_started = true;
3698
		run_again(sdata, assoc_data->timeout);
3699
	} else {
3700 3701 3702 3703 3704
		assoc_data->timeout =
			round_jiffies_up(jiffies +
					 IEEE80211_ASSOC_TIMEOUT_LONG);
		assoc_data->timeout_started = true;
		run_again(sdata, assoc_data->timeout);
3705
	}
J
Johannes Berg 已提交
3706 3707 3708 3709

	return 0;
}

3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721
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);
}

3722
void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
3723 3724
{
	struct ieee80211_local *local = sdata->local;
3725
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3726

3727
	sdata_lock(sdata);
3728

3729 3730 3731 3732 3733 3734 3735 3736 3737 3738
	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;
3739
				run_again(sdata, ifmgd->auth_data->timeout);
3740 3741 3742
			} else {
				ifmgd->auth_data->timeout = jiffies - 1;
			}
3743
			ifmgd->auth_data->timeout_started = true;
3744 3745 3746 3747 3748 3749
		} 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;
3750
				run_again(sdata, ifmgd->assoc_data->timeout);
3751 3752 3753
			} else {
				ifmgd->assoc_data->timeout = jiffies - 1;
			}
3754
			ifmgd->assoc_data->timeout_started = true;
3755 3756 3757
		}
	}

3758
	if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
J
Johannes Berg 已提交
3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772
	    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);

3773
			cfg80211_auth_timeout(sdata->dev, bssid);
J
Johannes Berg 已提交
3774
		}
3775
	} else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3776
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
3777

3778
	if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
J
Johannes Berg 已提交
3779
	    time_after(jiffies, ifmgd->assoc_data->timeout)) {
3780
		if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
J
Johannes Berg 已提交
3781
		    ieee80211_do_assoc(sdata)) {
3782
			struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
J
Johannes Berg 已提交
3783 3784

			ieee80211_destroy_assoc_data(sdata, false);
3785
			cfg80211_assoc_timeout(sdata->dev, bss);
J
Johannes Berg 已提交
3786
		}
3787
	} else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3788
		run_again(sdata, ifmgd->assoc_data->timeout);
J
Johannes Berg 已提交
3789

3790
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
J
Johannes Berg 已提交
3791
	    ifmgd->associated) {
3792
		u8 bssid[ETH_ALEN];
3793
		int max_tries;
3794

3795
		memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3796

3797
		if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3798
			max_tries = max_nullfunc_tries;
3799
		else
3800
			max_tries = max_probe_tries;
3801

3802 3803 3804
		/* ACK received for nullfunc probing frame */
		if (!ifmgd->probe_send_count)
			ieee80211_reset_ap_probe(sdata);
3805 3806
		else if (ifmgd->nullfunc_failed) {
			if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3807 3808 3809 3810
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
					 bssid, ifmgd->probe_send_count,
					 max_tries);
3811 3812
				ieee80211_mgd_probe_ap_send(sdata);
			} else {
J
Johannes Berg 已提交
3813 3814 3815
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
					 bssid);
3816
				ieee80211_sta_connection_lost(sdata, bssid,
3817 3818
					WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
					false);
3819 3820
			}
		} else if (time_is_after_jiffies(ifmgd->probe_timeout))
3821
			run_again(sdata, ifmgd->probe_timeout);
3822
		else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
J
Johannes Berg 已提交
3823 3824 3825
			mlme_dbg(sdata,
				 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
				 bssid, probe_wait_ms);
3826
			ieee80211_sta_connection_lost(sdata, bssid,
3827
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3828
		} else if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3829 3830 3831 3832
			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);
3833 3834
			ieee80211_mgd_probe_ap_send(sdata);
		} else {
J
Johannes Berg 已提交
3835 3836 3837 3838
			/*
			 * We actually lost the connection ... or did we?
			 * Let's make sure!
			 */
3839 3840 3841 3842
			wiphy_debug(local->hw.wiphy,
				    "%s: No probe response from AP %pM"
				    " after %dms, disconnecting.\n",
				    sdata->name,
3843
				    bssid, probe_wait_ms);
3844

3845
			ieee80211_sta_connection_lost(sdata, bssid,
3846
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
J
Johannes Berg 已提交
3847 3848 3849
		}
	}

3850
	sdata_unlock(sdata);
3851 3852
}

J
Johannes Berg 已提交
3853 3854 3855 3856 3857
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;
3858
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3859 3860 3861 3862

	if (local->quiescing)
		return;

3863
	if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
M
Michal Kazior 已提交
3864 3865
		return;

3866
	sdata->u.mgd.connection_loss = false;
3867 3868
	ieee80211_queue_work(&sdata->local->hw,
			     &sdata->u.mgd.beacon_connection_loss_work);
J
Johannes Berg 已提交
3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880
}

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;

3881
	if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
M
Michal Kazior 已提交
3882 3883
		return;

3884
	ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
J
Johannes Berg 已提交
3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895
}

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
3896 3897
static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
3898 3899
	u32 flags;

3900
	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3901
		__ieee80211_stop_poll(sdata);
3902

J
Johannes Berg 已提交
3903
		/* let's probe the connection once */
3904 3905 3906 3907
		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
3908
		/* and do all the other regular work too */
J
Johannes Berg 已提交
3909
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3910
	}
J
Johannes Berg 已提交
3911
}
3912

3913
#ifdef CONFIG_PM
3914 3915 3916 3917 3918 3919 3920
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);

3921 3922 3923 3924 3925
	if (ifmgd->auth_data || ifmgd->assoc_data) {
		const u8 *bssid = ifmgd->auth_data ?
				ifmgd->auth_data->bss->bssid :
				ifmgd->assoc_data->bss->bssid;

3926
		/*
3927 3928 3929
		 * 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.
3930
		 */
3931
		ieee80211_send_deauth_disassoc(sdata, bssid,
3932 3933 3934
					       IEEE80211_STYPE_DEAUTH,
					       WLAN_REASON_DEAUTH_LEAVING,
					       false, frame_buf);
3935 3936 3937 3938
		if (ifmgd->assoc_data)
			ieee80211_destroy_assoc_data(sdata, false);
		if (ifmgd->auth_data)
			ieee80211_destroy_auth_data(sdata, false);
3939 3940 3941 3942 3943 3944 3945
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
	}

	sdata_unlock(sdata);
}

3946 3947 3948 3949
void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

3950
	sdata_lock(sdata);
3951
	if (!ifmgd->associated) {
3952
		sdata_unlock(sdata);
3953 3954 3955 3956 3957 3958 3959 3960 3961 3962
		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);
3963
		sdata_unlock(sdata);
3964 3965
		return;
	}
3966
	sdata_unlock(sdata);
3967 3968 3969
}
#endif

J
Johannes Berg 已提交
3970 3971
/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3972
{
3973
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
3974

3975
	ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3976
	INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3977
	INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3978 3979
	INIT_WORK(&ifmgd->beacon_connection_loss_work,
		  ieee80211_beacon_connection_loss_work);
3980 3981
	INIT_WORK(&ifmgd->csa_connection_drop_work,
		  ieee80211_csa_connection_drop_work);
3982
	INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
3983 3984
	INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
			  ieee80211_tdls_peer_del_work);
3985
	setup_timer(&ifmgd->timer, ieee80211_sta_timer,
S
Sujith 已提交
3986
		    (unsigned long) sdata);
J
Johannes Berg 已提交
3987 3988 3989 3990
	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);
3991
	setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
J
Johannes Berg 已提交
3992
		    (unsigned long) sdata);
3993 3994
	INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
			  ieee80211_sta_handle_tspec_ac_params_wk);
J
Johannes Berg 已提交
3995

3996
	ifmgd->flags = 0;
3997
	ifmgd->powersave = sdata->wdev.ps;
3998 3999
	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
4000
	ifmgd->p2p_noa_index = -1;
J
Johannes Berg 已提交
4001

4002
	if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4003 4004 4005
		ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
	else
		ifmgd->req_smps = IEEE80211_SMPS_OFF;
4006 4007 4008 4009 4010

	/* Setup TDLS data */
	spin_lock_init(&ifmgd->teardown_lock);
	ifmgd->teardown_skb = NULL;
	ifmgd->orig_teardown_skb = NULL;
4011 4012
}

4013 4014
/* scan finished notification */
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
J
Johannes Berg 已提交
4015
{
4016
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
4017

4018 4019
	/* Restart STA timers */
	rcu_read_lock();
4020 4021 4022 4023
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (ieee80211_sdata_running(sdata))
			ieee80211_restart_sta_timer(sdata);
	}
4024 4025
	rcu_read_unlock();
}
J
Johannes Berg 已提交
4026

4027 4028 4029 4030 4031 4032 4033
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);
4034

4035 4036 4037
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, latency_usec);
	mutex_unlock(&local->iflist_mtx);
4038

4039
	return NOTIFY_OK;
J
Johannes Berg 已提交
4040 4041
}

J
Johannes Berg 已提交
4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053
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;

4054
	ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
J
Johannes Berg 已提交
4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066
	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;

4067
	vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
J
Johannes Berg 已提交
4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085
	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;
}

4086 4087
static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
				  struct cfg80211_bss *cbss)
4088 4089 4090
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4091
	const struct ieee80211_ht_cap *ht_cap = NULL;
4092
	const struct ieee80211_ht_operation *ht_oper = NULL;
J
Johannes Berg 已提交
4093
	const struct ieee80211_vht_operation *vht_oper = NULL;
4094
	struct ieee80211_supported_band *sband;
4095
	struct cfg80211_chan_def chandef;
J
Johannes Berg 已提交
4096
	int ret;
4097

4098 4099
	sband = local->hw.wiphy->bands[cbss->channel->band];

J
Johannes Berg 已提交
4100 4101 4102 4103
	ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
			  IEEE80211_STA_DISABLE_80P80MHZ |
			  IEEE80211_STA_DISABLE_160MHZ);

4104 4105
	rcu_read_lock();

J
Johannes Berg 已提交
4106 4107
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	    sband->ht_cap.ht_supported) {
4108
		const u8 *ht_oper_ie, *ht_cap_ie;
4109

4110
		ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4111 4112
		if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
			ht_oper = (void *)(ht_oper_ie + 2);
4113

4114 4115 4116 4117 4118
		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) {
4119 4120 4121
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ht_oper = NULL;
		}
4122 4123
	}

J
Johannes Berg 已提交
4124 4125
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    sband->vht_cap.vht_supported) {
4126
		const u8 *vht_oper_ie, *vht_cap;
J
Johannes Berg 已提交
4127

4128 4129
		vht_oper_ie = ieee80211_bss_get_ie(cbss,
						   WLAN_EID_VHT_OPERATION);
J
Johannes Berg 已提交
4130 4131 4132 4133
		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
4134
			sdata_info(sdata,
J
Johannes Berg 已提交
4135
				   "AP advertised VHT without HT, disabling both\n");
4136 4137
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4138
		}
4139 4140 4141 4142 4143 4144

		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;
		}
4145 4146
	}

J
Johannes Berg 已提交
4147 4148
	ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
						     cbss->channel,
4149
						     ht_cap, ht_oper, vht_oper,
4150
						     &chandef, false);
4151

J
Johannes Berg 已提交
4152 4153
	sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
				      local->rx_chains);
4154

4155 4156
	rcu_read_unlock();

4157 4158 4159
	/* will change later if needed */
	sdata->smps_mode = IEEE80211_SMPS_OFF;

4160
	mutex_lock(&local->mtx);
J
Johannes Berg 已提交
4161 4162 4163 4164 4165 4166 4167
	/*
	 * 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);
4168 4169 4170 4171

	/* don't downgrade for 5 and 10 MHz channels, though. */
	if (chandef.width == NL80211_CHAN_WIDTH_5 ||
	    chandef.width == NL80211_CHAN_WIDTH_10)
4172
		goto out;
4173

4174
	while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4175
		ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4176 4177 4178
		ret = ieee80211_vif_use_channel(sdata, &chandef,
						IEEE80211_CHANCTX_SHARED);
	}
4179 4180
 out:
	mutex_unlock(&local->mtx);
J
Johannes Berg 已提交
4181
	return ret;
4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207
}

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
4208
	if (new_sta) {
4209 4210 4211
		u32 rates = 0, basic_rates = 0;
		bool have_higher_than_11mbit;
		int min_rate = INT_MAX, min_rate_index = -1;
4212
		struct ieee80211_chanctx_conf *chanctx_conf;
4213
		struct ieee80211_supported_band *sband;
J
Johannes Berg 已提交
4214
		const struct cfg80211_bss_ies *ies;
4215 4216
		int shift;
		u32 rate_flags;
4217 4218 4219 4220 4221 4222

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

		err = ieee80211_prep_channel(sdata, cbss);
		if (err) {
			sta_info_free(local, new_sta);
4223
			return -EINVAL;
4224
		}
4225 4226 4227 4228 4229 4230
		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
4231
			sta_info_free(local, new_sta);
4232 4233 4234 4235
			return -EINVAL;
		}
		rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
		rcu_read_unlock();
4236 4237 4238 4239 4240

		ieee80211_get_rates(sband, bss->supp_rates,
				    bss->supp_rates_len,
				    &rates, &basic_rates,
				    &have_higher_than_11mbit,
4241 4242
				    &min_rate, &min_rate_index,
				    shift, rate_flags);
4243 4244 4245 4246 4247 4248 4249 4250 4251 4252

		/*
		 * 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
4253 4254
			sdata_info(sdata,
				   "No basic rates, using min rate instead\n");
4255 4256 4257
			basic_rates = BIT(min_rate_index);
		}

J
Johannes Berg 已提交
4258
		new_sta->sta.supp_rates[cbss->channel->band] = rates;
4259 4260 4261
		sdata->vif.bss_conf.basic_rates = basic_rates;

		/* cf. IEEE 802.11 9.2.12 */
J
Johannes Berg 已提交
4262
		if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4263 4264 4265 4266 4267 4268 4269
		    have_higher_than_11mbit)
			sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
		else
			sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

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

4270 4271
		/* set timing information */
		sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
J
Johannes Berg 已提交
4272
		rcu_read_lock();
4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298
		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
4299
		rcu_read_unlock();
4300 4301

		/* tell driver about BSSID, basic rates and timing */
4302
		ieee80211_bss_info_change_notify(sdata,
4303 4304
			BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
			BSS_CHANGED_BEACON_INT);
4305 4306

		if (assoc)
J
Johannes Berg 已提交
4307
			sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4308

J
Johannes Berg 已提交
4309 4310
		err = sta_info_insert(new_sta);
		new_sta = NULL;
4311
		if (err) {
J
Johannes Berg 已提交
4312 4313 4314
			sdata_info(sdata,
				   "failed to insert STA entry for the AP (error %d)\n",
				   err);
4315 4316 4317
			return err;
		}
	} else
4318
		WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4319 4320 4321 4322

	return 0;
}

4323 4324 4325
/* config hooks */
int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
		       struct cfg80211_auth_request *req)
J
Johannes Berg 已提交
4326
{
J
Johannes Berg 已提交
4327 4328 4329
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data;
4330
	u16 auth_alg;
J
Johannes Berg 已提交
4331 4332 4333
	int err;

	/* prepare auth data structure */
J
Johannes Berg 已提交
4334

4335 4336 4337 4338 4339
	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
4340
		if (IS_ERR(local->wep_tx_tfm))
4341
			return -EOPNOTSUPP;
4342 4343 4344 4345 4346 4347 4348 4349
		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;
4350 4351 4352
	case NL80211_AUTHTYPE_SAE:
		auth_alg = WLAN_AUTH_SAE;
		break;
4353 4354
	default:
		return -EOPNOTSUPP;
J
Johannes Berg 已提交
4355
	}
4356

4357 4358
	auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
			    req->ie_len, GFP_KERNEL);
J
Johannes Berg 已提交
4359
	if (!auth_data)
J
Johannes Berg 已提交
4360
		return -ENOMEM;
4361

J
Johannes Berg 已提交
4362
	auth_data->bss = req->bss;
4363

4364 4365 4366 4367 4368 4369 4370 4371 4372
	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;
	}

4373
	if (req->ie && req->ie_len) {
4374 4375 4376
		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
4377
	}
4378

J
Johannes Berg 已提交
4379
	if (req->key && req->key_len) {
J
Johannes Berg 已提交
4380 4381 4382
		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
4383 4384
	}

J
Johannes Berg 已提交
4385
	auth_data->algorithm = auth_alg;
J
Johannes Berg 已提交
4386

J
Johannes Berg 已提交
4387
	/* try to authenticate/probe */
4388

J
Johannes Berg 已提交
4389 4390 4391 4392
	if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
	    ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
4393 4394
	}

J
Johannes Berg 已提交
4395 4396
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
4397

J
Johannes Berg 已提交
4398 4399
	/* prep auth_data so we don't go into idle on disassoc */
	ifmgd->auth_data = auth_data;
J
Johannes Berg 已提交
4400

4401 4402 4403 4404 4405 4406 4407
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

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

4408 4409
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      sizeof(frame_buf));
4410
	}
J
Johannes Berg 已提交
4411

J
Johannes Berg 已提交
4412
	sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4413

4414 4415
	err = ieee80211_prep_connection(sdata, req->bss, false);
	if (err)
J
Johannes Berg 已提交
4416
		goto err_clear;
J
Johannes Berg 已提交
4417

J
Johannes Berg 已提交
4418 4419 4420 4421 4422 4423 4424
	err = ieee80211_probe_auth(sdata);
	if (err) {
		sta_info_destroy_addr(sdata, req->bss->bssid);
		goto err_clear;
	}

	/* hold our own reference */
4425
	cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4426
	return 0;
J
Johannes Berg 已提交
4427 4428

 err_clear:
4429 4430
	memset(ifmgd->bssid, 0, ETH_ALEN);
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4431 4432 4433 4434
	ifmgd->auth_data = NULL;
 err_free:
	kfree(auth_data);
	return err;
J
Johannes Berg 已提交
4435 4436
}

4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474
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;
}

4475 4476
int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
			struct cfg80211_assoc_request *req)
4477
{
J
Johannes Berg 已提交
4478
	struct ieee80211_local *local = sdata->local;
4479
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4480
	struct ieee80211_bss *bss = (void *)req->bss->priv;
J
Johannes Berg 已提交
4481
	struct ieee80211_mgd_assoc_data *assoc_data;
4482
	const struct cfg80211_bss_ies *beacon_ies;
J
Johannes Berg 已提交
4483
	struct ieee80211_supported_band *sband;
4484
	const u8 *ssidie, *ht_ie, *vht_ie;
4485
	int i, err;
4486

J
Johannes Berg 已提交
4487 4488 4489 4490
	assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
	if (!assoc_data)
		return -ENOMEM;

4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501
	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();

4502 4503 4504 4505 4506 4507 4508
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

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

4509 4510
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      sizeof(frame_buf));
4511
	}
J
Johannes Berg 已提交
4512 4513 4514 4515

	if (ifmgd->auth_data && !ifmgd->auth_data->done) {
		err = -EBUSY;
		goto err_free;
J
Johannes Berg 已提交
4516
	}
4517

J
Johannes Berg 已提交
4518 4519 4520 4521
	if (ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
	}
4522

J
Johannes Berg 已提交
4523 4524 4525 4526
	if (ifmgd->auth_data) {
		bool match;

		/* keep sta info, bssid if matching */
4527
		match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
J
Johannes Berg 已提交
4528
		ieee80211_destroy_auth_data(sdata, match);
4529 4530
	}

J
Johannes Berg 已提交
4531
	/* prepare assoc data */
4532

4533 4534
	ifmgd->beacon_crc_valid = false;

4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569 4570
	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
4571 4572 4573 4574 4575 4576 4577
	/*
	 * 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.
	 */
4578
	for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4579 4580
		if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4581
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4582
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4583
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4584
			netdev_info(sdata->dev,
4585
				    "disabling HT/VHT due to WEP/TKIP use\n");
4586 4587
		}
	}
4588

4589
	if (req->flags & ASSOC_REQ_DISABLE_HT) {
4590
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4591 4592
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
	}
B
Ben Greear 已提交
4593

4594 4595 4596
	if (req->flags & ASSOC_REQ_DISABLE_VHT)
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;

J
Johannes Berg 已提交
4597 4598 4599
	/* 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 ||
4600 4601
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4602
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4603 4604
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4605 4606
			netdev_info(sdata->dev,
				    "disabling HT as WMM/QoS is not supported by the AP\n");
4607
	}
J
Johannes Berg 已提交
4608

4609 4610
	/* disable VHT if we don't support it or the AP doesn't use WMM */
	if (!sband->vht_cap.vht_supported ||
4611 4612
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4613
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4614 4615
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4616 4617
			netdev_info(sdata->dev,
				    "disabling VHT as WMM/QoS is not supported by the AP\n");
4618 4619
	}

B
Ben Greear 已提交
4620 4621 4622 4623
	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));

4624 4625 4626 4627
	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));

4628
	if (req->ie && req->ie_len) {
J
Johannes Berg 已提交
4629 4630 4631
		memcpy(assoc_data->ie, req->ie, req->ie_len);
		assoc_data->ie_len = req->ie_len;
	}
4632

J
Johannes Berg 已提交
4633
	assoc_data->bss = req->bss;
4634

J
Johannes Berg 已提交
4635 4636
	if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
		if (ifmgd->powersave)
4637
			sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
J
Johannes Berg 已提交
4638
		else
4639
			sdata->smps_mode = IEEE80211_SMPS_OFF;
J
Johannes Berg 已提交
4640
	} else
4641
		sdata->smps_mode = ifmgd->req_smps;
J
Johannes Berg 已提交
4642

J
Johannes Berg 已提交
4643 4644 4645
	assoc_data->capability = req->bss->capability;
	assoc_data->supp_rates = bss->supp_rates;
	assoc_data->supp_rates_len = bss->supp_rates_len;
4646

4647
	rcu_read_lock();
4648 4649 4650 4651 4652
	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
4653
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4654 4655 4656 4657 4658 4659
	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;
4660
	rcu_read_unlock();
4661

K
Kalle Valo 已提交
4662
	if (bss->wmm_used && bss->uapsd_supported &&
4663
	    (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
4664
		assoc_data->uapsd = true;
K
Kalle Valo 已提交
4665 4666
		ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
	} else {
4667
		assoc_data->uapsd = false;
K
Kalle Valo 已提交
4668 4669 4670
		ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
	}

4671
	if (req->prev_bssid)
J
Johannes Berg 已提交
4672
		memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4673 4674 4675 4676 4677 4678 4679 4680 4681

	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;
	}

4682 4683 4684 4685 4686
	if (req->flags & ASSOC_REQ_USE_RRM)
		ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
	else
		ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;

4687 4688 4689 4690 4691
	if (req->crypto.control_port)
		ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
	else
		ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;

4692 4693
	sdata->control_port_protocol = req->crypto.control_port_ethertype;
	sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4694 4695
	sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
							sdata->vif.type);
4696

J
Johannes Berg 已提交
4697 4698 4699
	/* kick off associate process */

	ifmgd->assoc_data = assoc_data;
4700
	ifmgd->dtim_period = 0;
4701
	ifmgd->have_beacon = false;
J
Johannes Berg 已提交
4702

4703 4704 4705
	err = ieee80211_prep_connection(sdata, req->bss, true);
	if (err)
		goto err_clear;
J
Johannes Berg 已提交
4706

4707 4708
	rcu_read_lock();
	beacon_ies = rcu_dereference(req->bss->beacon_ies);
4709

4710 4711 4712 4713 4714 4715 4716 4717 4718
	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);
4719
		assoc_data->timeout_started = true;
4720 4721 4722 4723 4724
		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);
4725 4726
		u8 dtim_count = 0;

4727 4728 4729 4730
		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;
4731
			dtim_count = tim->dtim_count;
4732
		}
4733
		ifmgd->have_beacon = true;
J
Johannes Berg 已提交
4734
		assoc_data->timeout = jiffies;
4735
		assoc_data->timeout_started = true;
4736 4737 4738 4739 4740 4741 4742

		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;
		}
4743 4744
	} else {
		assoc_data->timeout = jiffies;
4745
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
4746
	}
4747 4748
	rcu_read_unlock();

4749
	run_again(sdata, assoc_data->timeout);
J
Johannes Berg 已提交
4750

P
Paul Stewart 已提交
4751 4752 4753 4754 4755 4756 4757 4758 4759 4760
	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
4761 4762
		sdata_info(sdata, "associating with AP with corrupt %s\n",
			   corrupt_type);
P
Paul Stewart 已提交
4763 4764
	}

4765
	return 0;
J
Johannes Berg 已提交
4766
 err_clear:
4767 4768
	memset(ifmgd->bssid, 0, ETH_ALEN);
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4769 4770 4771 4772
	ifmgd->assoc_data = NULL;
 err_free:
	kfree(assoc_data);
	return err;
4773 4774
}

4775
int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4776
			 struct cfg80211_deauth_request *req)
4777
{
4778
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4779
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4780
	bool tx = !req->local_state_change;
4781

4782 4783 4784 4785 4786 4787
	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));
4788

4789
		drv_mgd_prepare_tx(sdata->local, sdata);
4790 4791
		ieee80211_send_deauth_disassoc(sdata, req->bssid,
					       IEEE80211_STYPE_DEAUTH,
4792
					       req->reason_code, tx,
4793
					       frame_buf);
4794
		ieee80211_destroy_auth_data(sdata, false);
4795 4796
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
4797

4798
		return 0;
4799 4800
	}

4801 4802
	if (ifmgd->associated &&
	    ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4803 4804 4805 4806 4807
		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));

4808 4809
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       req->reason_code, tx, frame_buf);
4810 4811
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
4812 4813
		return 0;
	}
4814

4815
	return -ENOTCONN;
4816
}
4817

4818
int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4819
			   struct cfg80211_disassoc_request *req)
J
Johannes Berg 已提交
4820
{
4821
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4822
	u8 bssid[ETH_ALEN];
4823
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
J
Johannes Berg 已提交
4824

J
Johannes Berg 已提交
4825 4826 4827 4828 4829 4830
	/*
	 * 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.
	 */
4831
	if (ifmgd->associated != req->bss)
4832 4833
		return -ENOLINK;

J
Johannes Berg 已提交
4834
	sdata_info(sdata,
4835 4836
		   "disassociating from %pM by local choice (Reason: %u=%s)\n",
		   req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4837

4838
	memcpy(bssid, req->bss->bssid, ETH_ALEN);
4839 4840 4841
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
			       req->reason_code, !req->local_state_change,
			       frame_buf);
4842

4843 4844
	cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
			      IEEE80211_DEAUTH_FRAME_LEN);
4845

4846 4847
	return 0;
}
4848

4849
void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4850 4851 4852
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

4853 4854 4855 4856 4857 4858 4859 4860 4861 4862
	/*
	 * 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);
4863
	cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4864

4865
	sdata_lock(sdata);
4866 4867
	if (ifmgd->assoc_data) {
		struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4868
		ieee80211_destroy_assoc_data(sdata, false);
4869 4870
		cfg80211_assoc_timeout(sdata->dev, bss);
	}
4871 4872
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
4873 4874 4875 4876 4877 4878 4879
	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);
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	del_timer_sync(&ifmgd->timer);
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	sdata_unlock(sdata);
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}

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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
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	trace_api_cqm_rssi_notify(sdata, rssi_event);

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