mlme.c 144.4 KB
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/*
 * BSS client mode implementation
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 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
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 * Copyright 2004, Instant802 Networks, Inc.
 * Copyright 2005, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
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 * Copyright 2013-2014  Intel Mobile Communications GmbH
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 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

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

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

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

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

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

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	if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
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		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 (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
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		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;
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	struct ieee80211_sta_ht_cap sta_ht_cap;
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	u32 ht_cfreq, ret;

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

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	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 || !sta_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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		vht_chandef = *chandef;
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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 */
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	if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
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		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;
549
	u32 mask, ap_bf_sts, our_bf_sts;
550 551 552 553

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

	memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
554
	ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
555 556 557 558

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

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	if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
560 561 562 563 564 565
		u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;

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

	if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
		cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
570
		cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
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	}

573 574 575 576 577 578 579 580
	/*
	 * 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;

581 582 583 584 585 586 587 588 589 590
	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;
	}

591
	/* reserve and fill IE */
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	pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
593 594 595
	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;
605
	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;
610
	u32 rate_flags, rates = 0;
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612
	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;
	}
620
	chan = chanctx_conf->def.chan;
621
	rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
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	rcu_read_unlock();
	sband = local->hw.wiphy->bands[chan->band];
624
	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)...
		 */
633 634 635 636
		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.
		 */
643 644 645 646 647 648 649 650
		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) {
672 673
		capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
		capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
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	}

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

	if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
680
	    ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
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		capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;

683 684 685
	if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
		capab |= WLAN_CAPABILITY_RADIO_MEASURE;

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686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727
	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) {
728 729 730
			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) {
743 744 745 746
				int rate;
				rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
						    5 * (1 << shift));
				*pos++ = (u8) rate;
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			}
		}
	}

751 752
	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 */
757 758
		 /* max tx power */
		*pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
759
	}
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761
	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 */
774
	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,
785 786
			WLAN_EID_FAST_BSS_TRANSITION,	/* reassoc only */
			WLAN_EID_RIC_DATA,		/* reassoc only */
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			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
		};
789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808
		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;

818
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
819
		ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
820
				    sband, chan, sdata->smps_mode);
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822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841
	/* 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,
		};
842 843

		/* RIC already taken above, so no need to handle here anymore */
844 845 846 847 848 849 850 851
		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;
	}

852
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
853 854
		ieee80211_add_vht_ie(sdata, skb, sband,
				     &assoc_data->ap_vht_cap);
855

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	/* if present, add any custom non-vendor IEs that go after HT */
857
	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;
	}

866 867
	if (assoc_data->wmm) {
		if (assoc_data->uapsd) {
868 869
			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;
		}

875
		pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
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876 877 878
	}

	/* add any remaining custom (i.e. vendor specific here) IEs */
879
	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;
888
	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
889 890
		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);
}

894 895 896 897 898 899
void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_pspoll *pspoll;
	struct sk_buff *skb;

900 901
	skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
	if (!skb)
902 903
		return;

904 905
	pspoll = (struct ieee80211_pspoll *) skb->data;
	pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
906

907 908
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
909 910
}

911 912 913 914 915
void ieee80211_send_nullfunc(struct ieee80211_local *local,
			     struct ieee80211_sub_if_data *sdata,
			     int powersave)
{
	struct sk_buff *skb;
916
	struct ieee80211_hdr_3addr *nullfunc;
917
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
918

919 920
	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
	if (!skb)
921 922
		return;

923
	nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
924
	if (powersave)
925
		nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
926

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

930
	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
931 932
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;

933
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
934 935
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;

936
	ieee80211_tx_skb(sdata, skb);
937 938
}

939 940 941 942 943 944 945 946 947 948 949
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);
950
	if (!skb)
951
		return;
952

953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968
	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);
}

969 970 971 972 973
/* 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);
974
	struct ieee80211_local *local = sdata->local;
975
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
976
	int ret;
977

978
	if (!ieee80211_sdata_running(sdata))
979 980
		return;

981
	sdata_lock(sdata);
982 983 984
	mutex_lock(&local->mtx);
	mutex_lock(&local->chanctx_mtx);

985 986
	if (!ifmgd->associated)
		goto out;
987

988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021
	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)) {
1022
		sdata_info(sdata,
1023
			   "failed to finalize channel switch, disconnecting\n");
1024 1025 1026 1027
		ieee80211_queue_work(&sdata->local->hw,
				     &ifmgd->csa_connection_drop_work);
		goto out;
	}
1028

1029
	/* XXX: shouldn't really modify cfg80211-owned data! */
1030
	ifmgd->associated->channel = sdata->csa_chandef.chan;
1031

1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051
	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);
1052

1053 1054 1055 1056 1057
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
1058

1059 1060 1061
	sdata->vif.csa_active = false;
	ifmgd->csa_waiting_bcn = false;

1062 1063 1064 1065 1066 1067
	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);
1068
		return;
1069
	}
1070 1071

	cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1072 1073
}

1074 1075
void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
{
J
Johannes Berg 已提交
1076 1077
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1078 1079 1080

	trace_api_chswitch_done(sdata, success);
	if (!success) {
1081 1082 1083 1084 1085 1086
		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);
1087 1088 1089 1090
	}
}
EXPORT_SYMBOL(ieee80211_chswitch_done);

1091 1092 1093 1094
static void ieee80211_chswitch_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
1095

1096
	ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1097 1098
}

1099
static void
J
Johannes Berg 已提交
1100
ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1101 1102
				 u64 timestamp, u32 device_timestamp,
				 struct ieee802_11_elems *elems,
1103
				 bool beacon)
1104
{
1105
	struct ieee80211_local *local = sdata->local;
1106
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1107
	struct cfg80211_bss *cbss = ifmgd->associated;
1108
	struct ieee80211_chanctx_conf *conf;
J
Johannes Berg 已提交
1109
	struct ieee80211_chanctx *chanctx;
1110
	enum ieee80211_band current_band;
1111
	struct ieee80211_csa_ie csa_ie;
1112
	struct ieee80211_channel_switch ch_switch;
1113
	int res;
1114

1115
	sdata_assert_lock(sdata);
1116

1117
	if (!cbss)
1118 1119
		return;

1120
	if (local->scanning)
1121 1122
		return;

1123
	/* disregard subsequent announcements if we are already processing */
1124
	if (sdata->vif.csa_active)
1125 1126
		return;

1127
	current_band = cbss->channel->band;
1128
	memset(&csa_ie, 0, sizeof(csa_ie));
1129
	res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1130
					   ifmgd->flags,
1131
					   ifmgd->associated->bssid, &csa_ie);
1132
	if (res	< 0)
1133
		ieee80211_queue_work(&local->hw,
1134
				     &ifmgd->csa_connection_drop_work);
1135
	if (res)
1136
		return;
1137

1138
	if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1139 1140 1141
				     IEEE80211_CHAN_DISABLED)) {
		sdata_info(sdata,
			   "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1142
			   ifmgd->associated->bssid,
1143 1144 1145
			   csa_ie.chandef.chan->center_freq,
			   csa_ie.chandef.width, csa_ie.chandef.center_freq1,
			   csa_ie.chandef.center_freq2);
1146 1147 1148 1149 1150
		ieee80211_queue_work(&local->hw,
				     &ifmgd->csa_connection_drop_work);
		return;
	}

1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161
	if (cfg80211_chandef_identical(&csa_ie.chandef,
				       &sdata->vif.bss_conf.chandef)) {
		if (ifmgd->csa_ignored_same_chan)
			return;
		sdata_info(sdata,
			   "AP %pM tries to chanswitch to same channel, ignore\n",
			   ifmgd->associated->bssid);
		ifmgd->csa_ignored_same_chan = true;
		return;
	}

1162 1163 1164 1165 1166 1167 1168 1169
	/*
	 * Drop all TDLS peers - either we disconnect or move to a different
	 * channel from this point on. There's no telling what our peer will do.
	 * The TDLS WIDER_BW scenario is also problematic, as peers might now
	 * have an incompatible wider chandef.
	 */
	ieee80211_teardown_tdls_peers(sdata);

1170
	mutex_lock(&local->mtx);
1171
	mutex_lock(&local->chanctx_mtx);
1172 1173 1174 1175 1176
	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");
1177
		goto drop_connection;
1178 1179 1180 1181
	}

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

1182
	if (local->use_chanctx &&
1183
	    !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1184 1185
		sdata_info(sdata,
			   "driver doesn't support chan-switch with channel contexts\n");
1186
		goto drop_connection;
J
Johannes Berg 已提交
1187 1188
	}

1189 1190 1191 1192 1193 1194 1195 1196 1197
	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");
1198
		goto drop_connection;
1199 1200
	}

1201 1202 1203
	res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
					    chanctx->mode, false);
	if (res) {
J
Johannes Berg 已提交
1204
		sdata_info(sdata,
1205 1206
			   "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
			   res);
1207
		goto drop_connection;
J
Johannes Berg 已提交
1208
	}
1209
	mutex_unlock(&local->chanctx_mtx);
J
Johannes Berg 已提交
1210

1211
	sdata->vif.csa_active = true;
1212
	sdata->csa_chandef = csa_ie.chandef;
1213
	sdata->csa_block_tx = csa_ie.mode;
1214
	ifmgd->csa_ignored_same_chan = false;
J
Johannes Berg 已提交
1215

1216
	if (sdata->csa_block_tx)
1217 1218
		ieee80211_stop_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
1219
	mutex_unlock(&local->mtx);
1220

1221 1222 1223
	cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
					  csa_ie.count);

1224
	if (local->ops->channel_switch) {
1225
		/* use driver's channel switch callback */
1226
		drv_channel_switch(local, sdata, &ch_switch);
1227 1228 1229 1230
		return;
	}

	/* channel switch handled in software */
1231
	if (csa_ie.count <= 1)
1232
		ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1233
	else
1234
		mod_timer(&ifmgd->chswitch_timer,
1235 1236
			  TU_TO_EXP_TIME((csa_ie.count - 1) *
					 cbss->beacon_interval));
1237 1238 1239 1240 1241
	return;
 drop_connection:
	ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
	mutex_unlock(&local->chanctx_mtx);
	mutex_unlock(&local->mtx);
1242 1243
}

1244 1245 1246 1247 1248 1249
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)
1250
{
1251 1252
	struct ieee80211_country_ie_triplet *triplet;
	int chan = ieee80211_frequency_to_channel(channel->center_freq);
1253
	int i, chan_increment;
1254
	bool have_chan_pwr = false;
1255

1256 1257
	/* Invalid IE */
	if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1258
		return false;
1259

1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273
	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;
1274
	}
1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285

	/* 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;
1286
				*chan_pwr = triplet->chans.max_power;
1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297
				break;
			}
		}
		if (have_chan_pwr)
			break;

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

1298
	if (have_chan_pwr && pwr_constr_elem)
1299
		*pwr_reduction = *pwr_constr_elem;
1300 1301 1302
	else
		*pwr_reduction = 0;

1303 1304 1305
	return have_chan_pwr;
}

1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319
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];
}

1320 1321 1322 1323
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,
1324 1325
				       const u8 *pwr_constr_ie,
				       const u8 *cisco_dtpc_ie)
1326
{
1327 1328 1329
	bool has_80211h_pwr = false, has_cisco_pwr = false;
	int chan_pwr = 0, pwr_reduction_80211h = 0;
	int pwr_level_cisco, pwr_level_80211h;
1330
	int new_ap_level;
1331
	__le16 capab = mgmt->u.probe_resp.capab_info;
1332

1333 1334 1335
	if (country_ie &&
	    (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
	     capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1336 1337 1338
		has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
			sdata, channel, country_ie, country_ie_len,
			pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1339 1340 1341 1342 1343 1344 1345 1346
		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;
1347
	}
1348

1349
	if (!has_80211h_pwr && !has_cisco_pwr)
1350
		return 0;
1351

1352 1353 1354 1355 1356
	/* 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)) {
1357 1358 1359 1360
		sdata_dbg(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);
1361 1362
		new_ap_level = pwr_level_80211h;
	} else {  /* has_cisco_pwr is always true here. */
1363 1364 1365
		sdata_dbg(sdata,
			  "Limiting TX power to %d dBm as advertised by %pM\n",
			  pwr_level_cisco, sdata->u.mgd.bssid);
1366 1367
		new_ap_level = pwr_level_cisco;
	}
1368

1369 1370
	if (sdata->ap_power_level == new_ap_level)
		return 0;
1371

1372 1373 1374 1375
	sdata->ap_power_level = new_ap_level;
	if (__ieee80211_recalc_txpower(sdata))
		return BSS_CHANGED_TXPOWER;
	return 0;
1376 1377
}

1378 1379 1380 1381 1382 1383
/* 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
1384 1385 1386 1387
	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
1388
	if (local->scanning)
J
Johannes Berg 已提交
1389 1390
		return;

1391
	if (conf->dynamic_ps_timeout > 0 &&
1392
	    !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1393 1394 1395
		mod_timer(&local->dynamic_ps_timer, jiffies +
			  msecs_to_jiffies(conf->dynamic_ps_timeout));
	} else {
1396
		if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1397
			ieee80211_send_nullfunc(local, sdata, 1);
1398

1399 1400
		if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
		    ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1401 1402 1403 1404
			return;

		conf->flags |= IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421
	}
}

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);
	}
}

1422 1423 1424 1425
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
1426
	bool authorized = false;
1427 1428 1429 1430

	if (!mgd->powersave)
		return false;

1431 1432 1433
	if (mgd->broken_ap)
		return false;

1434 1435 1436
	if (!mgd->associated)
		return false;

1437
	if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1438 1439
		return false;

1440
	if (!mgd->have_beacon)
1441 1442
		return false;

1443 1444 1445
	rcu_read_lock();
	sta = sta_info_get(sdata, mgd->bssid);
	if (sta)
J
Johannes Berg 已提交
1446
		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1447 1448
	rcu_read_unlock();

J
Johannes Berg 已提交
1449
	return authorized;
1450 1451
}

1452
/* need to hold RTNL or interface lock */
1453
void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1454 1455 1456
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;
1457
	int timeout;
1458

1459
	if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1460 1461 1462 1463 1464
		local->ps_sdata = NULL;
		return;
	}

	list_for_each_entry(sdata, &local->interfaces, list) {
1465
		if (!ieee80211_sdata_running(sdata))
1466
			continue;
1467 1468 1469 1470 1471 1472 1473 1474
		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;
		}
1475 1476 1477 1478 1479 1480
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

1481
	if (count == 1 && ieee80211_powersave_allowed(found)) {
1482 1483 1484
		s32 beaconint_us;

		if (latency < 0)
M
Mark Gross 已提交
1485
			latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1486 1487 1488 1489

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

1490
		timeout = local->dynamic_ps_forced_timeout;
1491 1492
		if (timeout < 0) {
			/*
1493 1494
			 * Go to full PSM if the user configures a very low
			 * latency requirement.
1495 1496 1497
			 * The 2000 second value is there for compatibility
			 * until the PM_QOS_NETWORK_LATENCY is configured
			 * with real values.
1498
			 */
1499 1500
			if (latency > (1900 * USEC_PER_MSEC) &&
			    latency != (2000 * USEC_PER_SEC))
1501
				timeout = 0;
1502 1503
			else
				timeout = 100;
1504
		}
1505
		local->hw.conf.dynamic_ps_timeout = timeout;
1506

1507
		if (beaconint_us > latency) {
1508
			local->ps_sdata = NULL;
1509 1510
		} else {
			int maxslp = 1;
1511
			u8 dtimper = found->u.mgd.dtim_period;
1512 1513 1514 1515 1516

			/* If the TIM IE is invalid, pretend the value is 1 */
			if (!dtimper)
				dtimper = 1;
			else if (dtimper > 1)
1517 1518 1519
				maxslp = min_t(int, dtimper,
						    latency / beaconint_us);

1520
			local->hw.conf.max_sleep_period = maxslp;
1521
			local->hw.conf.ps_dtim_period = dtimper;
1522
			local->ps_sdata = found;
1523
		}
1524
	} else {
1525
		local->ps_sdata = NULL;
1526
	}
1527 1528 1529 1530

	ieee80211_change_ps(local);
}

E
Eliad Peller 已提交
1531 1532 1533 1534 1535 1536 1537 1538 1539 1540
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);
	}
}

1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552
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,
1553
					IEEE80211_MAX_QUEUE_MAP,
1554 1555
					IEEE80211_QUEUE_STOP_REASON_PS,
					false);
1556 1557 1558 1559 1560 1561 1562 1563
}

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;
1564
	struct ieee80211_if_managed *ifmgd;
1565 1566
	unsigned long flags;
	int q;
1567 1568 1569 1570 1571

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

1572 1573
	ifmgd = &sdata->u.mgd;

1574 1575 1576
	if (local->hw.conf.flags & IEEE80211_CONF_PS)
		return;

1577
	if (local->hw.conf.dynamic_ps_timeout > 0) {
1578 1579
		/* don't enter PS if TX frames are pending */
		if (drv_tx_frames_pending(local)) {
1580 1581 1582 1583 1584
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
			return;
		}
1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602

		/*
		 * 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);
1603 1604
	}

1605
	if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1606
	    !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1607
		if (drv_tx_frames_pending(local)) {
1608 1609 1610
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
1611
		} else {
1612 1613
			ieee80211_send_nullfunc(local, sdata, 1);
			/* Flush to get the tx status of nullfunc frame */
1614
			ieee80211_flush_queues(local, sdata, false);
1615
		}
1616 1617
	}

1618 1619
	if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
	      ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1620 1621 1622 1623 1624
	    (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);
	}
1625 1626 1627 1628 1629 1630
}

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

1631
	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1632 1633
}

1634 1635 1636 1637 1638 1639 1640
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);
1641
	struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1642

1643 1644 1645 1646 1647 1648 1649 1650
	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);
1651 1652
}

1653 1654 1655 1656 1657
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;
1658
	bool ret = false;
1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741
	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
1742
/* MLME */
1743
static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1744
				     struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
1745
				     const u8 *wmm_param, size_t wmm_param_len)
1746 1747
{
	struct ieee80211_tx_queue_params params;
1748
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1749 1750
	size_t left;
	int count;
J
Johannes Berg 已提交
1751 1752
	const u8 *pos;
	u8 uapsd_queues = 0;
1753

1754
	if (!local->ops->conf_tx)
1755
		return false;
1756

J
Johannes Berg 已提交
1757
	if (local->hw.queues < IEEE80211_NUM_ACS)
1758
		return false;
1759 1760

	if (!wmm_param)
1761
		return false;
1762

1763
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1764
		return false;
K
Kalle Valo 已提交
1765 1766

	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1767
		uapsd_queues = ifmgd->uapsd_queues;
K
Kalle Valo 已提交
1768

1769
	count = wmm_param[6] & 0x0f;
1770
	if (count == ifmgd->wmm_last_param_set)
1771
		return false;
1772
	ifmgd->wmm_last_param_set = count;
1773 1774 1775 1776 1777 1778

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

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

Y
Yoni Divinsky 已提交
1779
	sdata->wmm_acm = 0;
1780 1781 1782
	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
1783
		bool uapsd = false;
1784 1785 1786
		int queue;

		switch (aci) {
1787
		case 1: /* AC_BK */
J
Johannes Berg 已提交
1788
			queue = 3;
J
Johannes Berg 已提交
1789
			if (acm)
Y
Yoni Divinsky 已提交
1790
				sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
K
Kalle Valo 已提交
1791 1792
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
				uapsd = true;
1793
			break;
1794
		case 2: /* AC_VI */
J
Johannes Berg 已提交
1795
			queue = 1;
J
Johannes Berg 已提交
1796
			if (acm)
Y
Yoni Divinsky 已提交
1797
				sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
K
Kalle Valo 已提交
1798 1799
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
				uapsd = true;
1800
			break;
1801
		case 3: /* AC_VO */
J
Johannes Berg 已提交
1802
			queue = 0;
J
Johannes Berg 已提交
1803
			if (acm)
Y
Yoni Divinsky 已提交
1804
				sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
K
Kalle Valo 已提交
1805 1806
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
				uapsd = true;
1807
			break;
1808
		case 0: /* AC_BE */
1809
		default:
J
Johannes Berg 已提交
1810
			queue = 2;
J
Johannes Berg 已提交
1811
			if (acm)
Y
Yoni Divinsky 已提交
1812
				sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
K
Kalle Valo 已提交
1813 1814
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
				uapsd = true;
1815 1816 1817 1818 1819 1820
			break;
		}

		params.aifs = pos[0] & 0x0f;
		params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params.cw_min = ecw2cw(pos[1] & 0x0f);
1821
		params.txop = get_unaligned_le16(pos + 2);
1822
		params.acm = acm;
K
Kalle Valo 已提交
1823 1824
		params.uapsd = uapsd;

J
Johannes Berg 已提交
1825
		mlme_dbg(sdata,
1826
			 "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
1827 1828
			 queue, aci, acm,
			 params.aifs, params.cw_min, params.cw_max,
1829 1830
			 params.txop, params.uapsd,
			 ifmgd->tx_tspec[queue].downgraded);
1831
		sdata->tx_conf[queue] = params;
1832 1833
		if (!ifmgd->tx_tspec[queue].downgraded &&
		    drv_conf_tx(local, sdata, queue, &params))
J
Johannes Berg 已提交
1834 1835 1836
			sdata_err(sdata,
				  "failed to set TX queue parameters for queue %d\n",
				  queue);
1837
	}
1838 1839

	/* enable WMM or activate new settings */
1840
	sdata->vif.bss_conf.qos = true;
1841
	return true;
1842 1843
}

1844 1845 1846 1847
static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
{
	lockdep_assert_held(&sdata->local->mtx);

1848
	sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1849 1850 1851 1852 1853 1854 1855 1856 1857 1858
	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
1859 1860
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
1861
{
J
Johannes Berg 已提交
1862
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1863
	u32 changed = 0;
J
Johannes Berg 已提交
1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876
	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
1877
	if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1878
		use_short_slot = true;
1879

1880 1881 1882
	if (use_protection != bss_conf->use_cts_prot) {
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
1883
	}
1884

1885 1886
	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
1887
		changed |= BSS_CHANGED_ERP_PREAMBLE;
1888
	}
1889

J
Johannes Berg 已提交
1890 1891 1892
	if (use_short_slot != bss_conf->use_short_slot) {
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
1893 1894 1895 1896 1897
	}

	return changed;
}

1898
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1899
				     struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
1900
				     u32 bss_info_changed)
1901
{
1902
	struct ieee80211_bss *bss = (void *)cbss->priv;
1903
	struct ieee80211_local *local = sdata->local;
1904
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1905

J
Johannes Berg 已提交
1906
	bss_info_changed |= BSS_CHANGED_ASSOC;
1907
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1908
		bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1909

1910
	sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1911
		beacon_loss_count * bss_conf->beacon_int));
1912

1913 1914
	sdata->u.mgd.associated = cbss;
	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1915

1916 1917
	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;

1918
	if (sdata->vif.p2p) {
1919
		const struct cfg80211_bss_ies *ies;
1920

1921 1922 1923 1924 1925 1926 1927 1928
		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
1929 1930
					(u8 *) &bss_conf->p2p_noa_attr,
					sizeof(bss_conf->p2p_noa_attr));
1931
			if (ret >= 2) {
J
Janusz Dziedzic 已提交
1932 1933
				sdata->u.mgd.p2p_noa_index =
					bss_conf->p2p_noa_attr.index;
1934 1935
				bss_info_changed |= BSS_CHANGED_P2P_PS;
			}
1936
		}
1937
		rcu_read_unlock();
1938 1939
	}

J
Johannes Berg 已提交
1940
	/* just to be sure */
1941
	ieee80211_stop_poll(sdata);
J
Johannes Berg 已提交
1942

1943
	ieee80211_led_assoc(local, 1);
1944

1945
	if (sdata->u.mgd.have_beacon) {
1946 1947 1948 1949 1950 1951 1952
		/*
		 * 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;
1953
		bss_conf->beacon_rate = bss->beacon_rate;
1954
		bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1955
	} else {
1956
		bss_conf->beacon_rate = NULL;
1957
		bss_conf->dtim_period = 0;
1958
	}
1959

1960
	bss_conf->assoc = 1;
1961

1962
	/* Tell the driver to monitor connection quality (if supported) */
1963
	if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1964
	    bss_conf->cqm_rssi_thold)
1965 1966
		bss_info_changed |= BSS_CHANGED_CQM;

1967
	/* Enable ARP filtering */
1968
	if (bss_conf->arp_addr_cnt)
1969 1970
		bss_info_changed |= BSS_CHANGED_ARP_FILTER;

J
Johannes Berg 已提交
1971
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1972

J
Johannes Berg 已提交
1973 1974 1975
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
	mutex_unlock(&local->iflist_mtx);
1976

1977
	ieee80211_recalc_smps(sdata);
E
Eliad Peller 已提交
1978 1979
	ieee80211_recalc_ps_vif(sdata);

1980
	netif_carrier_on(sdata->dev);
1981 1982
}

1983
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1984 1985
				   u16 stype, u16 reason, bool tx,
				   u8 *frame_buf)
1986
{
1987
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1988
	struct ieee80211_local *local = sdata->local;
1989
	u32 changed = 0;
1990

1991
	sdata_assert_lock(sdata);
1992

1993 1994 1995
	if (WARN_ON_ONCE(tx && !frame_buf))
		return;

J
Johannes Berg 已提交
1996 1997 1998
	if (WARN_ON(!ifmgd->associated))
		return;

1999 2000
	ieee80211_stop_poll(sdata);

2001
	ifmgd->associated = NULL;
2002 2003
	netif_carrier_off(sdata->dev);

2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014
	/*
	 * 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
2015 2016 2017
	/* disable per-vif ps */
	ieee80211_recalc_ps_vif(sdata);

2018 2019 2020
	/* make sure ongoing transmission finishes */
	synchronize_net();

2021 2022 2023 2024 2025 2026
	/*
	 * drop any frame before deauth/disassoc, this can be data or
	 * management frame. Since we are disconnecting, we should not
	 * insist sending these frames which can take time and delay
	 * the disconnection and possible the roaming.
	 */
2027
	if (tx)
2028
		ieee80211_flush_queues(local, sdata, true);
2029

2030 2031
	/* deauthenticate/disassociate now */
	if (tx || frame_buf)
2032 2033
		ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
					       reason, tx, frame_buf);
2034

2035
	/* flush out frame - make sure the deauth was actually sent */
2036
	if (tx)
2037
		ieee80211_flush_queues(local, sdata, false);
2038

2039
	/* clear bssid only after building the needed mgmt frames */
2040
	eth_zero_addr(ifmgd->bssid);
2041

2042
	/* remove AP and TDLS peers */
2043
	sta_info_flush(sdata);
2044 2045

	/* finally reset all BSS / config parameters */
2046 2047 2048
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
J
Johannes Berg 已提交
2049 2050
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
2051

J
Janusz Dziedzic 已提交
2052 2053 2054
	ifmgd->p2p_noa_index = -1;
	memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
	       sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2055

2056
	/* on the next assoc, re-program HT/VHT parameters */
B
Ben Greear 已提交
2057 2058
	memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
	memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2059 2060
	memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
	memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2061

2062
	sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2063

2064 2065 2066
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

2067
	/* Disable ARP filtering */
2068
	if (sdata->vif.bss_conf.arp_addr_cnt)
2069 2070
		changed |= BSS_CHANGED_ARP_FILTER;

2071 2072 2073
	sdata->vif.bss_conf.qos = false;
	changed |= BSS_CHANGED_QOS;

2074 2075
	/* The BSSID (not really interesting) and HT changed */
	changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
J
Johannes Berg 已提交
2076
	ieee80211_bss_info_change_notify(sdata, changed);
2077

2078 2079 2080
	/* disassociated - set to defaults now */
	ieee80211_set_wmm_default(sdata, false);

2081 2082 2083 2084
	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);
2085

2086
	sdata->vif.bss_conf.dtim_period = 0;
2087 2088
	sdata->vif.bss_conf.beacon_rate = NULL;

2089
	ifmgd->have_beacon = false;
2090

2091
	ifmgd->flags = 0;
2092
	mutex_lock(&local->mtx);
2093
	ieee80211_vif_release_channel(sdata);
2094 2095

	sdata->vif.csa_active = false;
2096
	ifmgd->csa_waiting_bcn = false;
2097
	ifmgd->csa_ignored_same_chan = false;
2098 2099 2100 2101 2102
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
2103
	mutex_unlock(&local->mtx);
2104

2105 2106 2107 2108
	/* existing TX TSPEC sessions no longer exist */
	memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
	cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);

2109
	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2110
}
2111

2112 2113 2114 2115 2116 2117 2118 2119
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
2120 2121
	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
2122
	 */
J
Johannes Berg 已提交
2123 2124 2125
	if (is_multicast_ether_addr(hdr->addr1))
		return;

2126
	ieee80211_sta_reset_conn_monitor(sdata);
2127
}
2128

2129 2130 2131
static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2132
	struct ieee80211_local *local = sdata->local;
2133

2134
	mutex_lock(&local->mtx);
2135 2136
	if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
		goto out;
2137

2138
	__ieee80211_stop_poll(sdata);
2139 2140 2141 2142

	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
	mutex_unlock(&local->iflist_mtx);
2143

2144
	if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2145
		goto out;
2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156

	/*
	 * 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));
2157 2158
out:
	mutex_unlock(&local->mtx);
2159 2160
}

2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195
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);
	}
}

2196
void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2197
			     struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2198
{
2199 2200
	ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);

F
Felix Fietkau 已提交
2201
	if (!ieee80211_is_data(hdr->frame_control))
2202 2203 2204 2205
	    return;

	if (ieee80211_is_nullfunc(hdr->frame_control) &&
	    sdata->u.mgd.probe_send_count > 0) {
2206
		if (ack)
2207
			ieee80211_sta_reset_conn_monitor(sdata);
2208 2209
		else
			sdata->u.mgd.nullfunc_failed = true;
2210
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2211
		return;
2212
	}
2213 2214 2215

	if (ack)
		ieee80211_sta_reset_conn_monitor(sdata);
2216 2217
}

2218 2219 2220 2221
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ssid;
2222
	u8 *dst = ifmgd->associated->bssid;
2223
	u8 unicast_limit = max(1, max_probe_tries - 3);
2224 2225 2226 2227 2228 2229 2230 2231

	/*
	 * 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;
2232

2233 2234 2235 2236 2237 2238 2239
	/*
	 * 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.
	 */
2240 2241
	ifmgd->probe_send_count++;

2242
	if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2243
		ifmgd->nullfunc_failed = false;
2244
		ieee80211_send_nullfunc(sdata->local, sdata, 0);
2245
	} else {
2246 2247
		int ssid_len;

2248
		rcu_read_lock();
2249
		ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2250 2251 2252 2253 2254
		if (WARN_ON_ONCE(ssid == NULL))
			ssid_len = 0;
		else
			ssid_len = ssid[1];

2255
		ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2256
					 ssid + 2, ssid_len, NULL,
2257
					 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
2258
					 ifmgd->associated->channel, false);
2259
		rcu_read_unlock();
2260
	}
2261

2262
	ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2263
	run_again(sdata, ifmgd->probe_timeout);
2264 2265
}

J
Johannes Berg 已提交
2266 2267
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
				   bool beacon)
2268 2269
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
2270
	bool already = false;
2271

2272
	if (!ieee80211_sdata_running(sdata))
2273 2274
		return;

2275
	sdata_lock(sdata);
2276 2277 2278 2279

	if (!ifmgd->associated)
		goto out;

2280 2281 2282 2283 2284 2285 2286
	mutex_lock(&sdata->local->mtx);

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

2287
	if (beacon) {
J
Johannes Berg 已提交
2288
		mlme_dbg_ratelimited(sdata,
2289 2290
				     "detected beacon loss from AP (missed %d beacons) - probing\n",
				     beacon_loss_count);
J
Johannes Berg 已提交
2291

2292
		ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2293
	}
2294

J
Johannes Berg 已提交
2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305
	/*
	 * 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!
	 */
2306
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
J
Johannes Berg 已提交
2307 2308
		already = true;

E
Eliad Peller 已提交
2309 2310
	ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;

2311 2312
	mutex_unlock(&sdata->local->mtx);

J
Johannes Berg 已提交
2313 2314 2315
	if (already)
		goto out;

2316 2317 2318 2319
	mutex_lock(&sdata->local->iflist_mtx);
	ieee80211_recalc_ps(sdata->local, -1);
	mutex_unlock(&sdata->local->iflist_mtx);

2320 2321
	ifmgd->probe_send_count = 0;
	ieee80211_mgd_probe_ap_send(sdata);
2322
 out:
2323
	sdata_unlock(sdata);
2324 2325
}

2326 2327 2328 2329 2330
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;
2331
	struct cfg80211_bss *cbss;
2332 2333
	struct sk_buff *skb;
	const u8 *ssid;
2334
	int ssid_len;
2335 2336 2337 2338

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

2339
	sdata_assert_lock(sdata);
2340

2341 2342 2343 2344 2345 2346 2347
	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
2348 2349
		return NULL;

2350
	rcu_read_lock();
2351
	ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2352 2353 2354 2355 2356
	if (WARN_ON_ONCE(ssid == NULL))
		ssid_len = 0;
	else
		ssid_len = ssid[1];

2357
	skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
J
Johannes Berg 已提交
2358
					(u32) -1, cbss->channel,
2359
					ssid + 2, ssid_len,
2360
					NULL, 0, true);
2361
	rcu_read_unlock();
2362 2363 2364 2365 2366

	return skb;
}
EXPORT_SYMBOL(ieee80211_ap_probereq_get);

2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384
static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
					const u8 *buf, size_t len, bool tx,
					u16 reason)
{
	struct ieee80211_event event = {
		.type = MLME_EVENT,
		.u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
		.u.mlme.reason = reason,
	};

	if (tx)
		cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
	else
		cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);

	drv_event_callback(sdata->local, sdata, &event);
}

2385
static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2386
{
2387
	struct ieee80211_local *local = sdata->local;
2388
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2389
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2390

2391
	sdata_lock(sdata);
2392
	if (!ifmgd->associated) {
2393
		sdata_unlock(sdata);
2394 2395 2396
		return;
	}

2397 2398
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
			       WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2399
			       true, frame_buf);
2400
	mutex_lock(&local->mtx);
2401
	sdata->vif.csa_active = false;
2402
	ifmgd->csa_waiting_bcn = false;
2403 2404 2405 2406 2407
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
2408
	mutex_unlock(&local->mtx);
2409

2410 2411 2412
	ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
				    WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);

2413
	sdata_unlock(sdata);
2414 2415
}

2416
static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
J
Johannes Berg 已提交
2417 2418 2419
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
2420
			     u.mgd.beacon_connection_loss_work);
2421 2422 2423 2424
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct sta_info *sta;

	if (ifmgd->associated) {
2425
		rcu_read_lock();
2426 2427 2428
		sta = sta_info_get(sdata, ifmgd->bssid);
		if (sta)
			sta->beacon_loss_count++;
2429
		rcu_read_unlock();
2430
	}
J
Johannes Berg 已提交
2431

2432
	if (ifmgd->connection_loss) {
2433 2434
		sdata_info(sdata, "Connection to AP %pM lost\n",
			   ifmgd->bssid);
2435
		__ieee80211_disconnect(sdata);
2436
	} else {
2437
		ieee80211_mgd_probe_ap(sdata, true);
2438 2439 2440 2441 2442 2443 2444 2445 2446
	}
}

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);

2447
	__ieee80211_disconnect(sdata);
J
Johannes Berg 已提交
2448 2449
}

2450 2451 2452
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2453
	struct ieee80211_hw *hw = &sdata->local->hw;
2454

J
Johannes Berg 已提交
2455 2456
	trace_api_beacon_loss(sdata);

2457
	sdata->u.mgd.connection_loss = false;
2458
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2459 2460 2461
}
EXPORT_SYMBOL(ieee80211_beacon_loss);

2462 2463 2464 2465 2466
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
2467 2468
	trace_api_connection_loss(sdata);

2469
	sdata->u.mgd.connection_loss = true;
2470 2471 2472 2473 2474
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_connection_loss);


J
Johannes Berg 已提交
2475 2476 2477 2478 2479
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;

2480
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2481 2482

	if (!assoc) {
2483 2484 2485 2486 2487 2488
		/*
		 * we are not authenticated yet, the only timer that could be
		 * running is the timeout for the authentication response which
		 * which is not relevant anymore.
		 */
		del_timer_sync(&sdata->u.mgd.timer);
J
Johannes Berg 已提交
2489 2490
		sta_info_destroy_addr(sdata, auth_data->bss->bssid);

2491
		eth_zero_addr(sdata->u.mgd.bssid);
J
Johannes Berg 已提交
2492
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2493
		sdata->u.mgd.flags = 0;
2494
		mutex_lock(&sdata->local->mtx);
J
Johannes Berg 已提交
2495
		ieee80211_vif_release_channel(sdata);
2496
		mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
2497 2498
	}

2499
	cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
J
Johannes Berg 已提交
2500 2501 2502 2503
	kfree(auth_data);
	sdata->u.mgd.auth_data = NULL;
}

2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531
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;

	sdata_assert_lock(sdata);

	if (!assoc) {
		/*
		 * we are not associated yet, the only timer that could be
		 * running is the timeout for the association response which
		 * which is not relevant anymore.
		 */
		del_timer_sync(&sdata->u.mgd.timer);
		sta_info_destroy_addr(sdata, assoc_data->bss->bssid);

		eth_zero_addr(sdata->u.mgd.bssid);
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
		sdata->u.mgd.flags = 0;
		mutex_lock(&sdata->local->mtx);
		ieee80211_vif_release_channel(sdata);
		mutex_unlock(&sdata->local->mtx);
	}

	kfree(assoc_data);
	sdata->u.mgd.assoc_data = NULL;
}

J
Johannes Berg 已提交
2532 2533 2534
static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
{
2535
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
2536 2537 2538
	struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
	u8 *pos;
	struct ieee802_11_elems elems;
2539
	u32 tx_flags = 0;
J
Johannes Berg 已提交
2540 2541

	pos = mgmt->u.auth.variable;
2542
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2543 2544 2545
	if (!elems.challenge)
		return;
	auth_data->expected_transaction = 4;
J
Johannes Berg 已提交
2546
	drv_mgd_prepare_tx(sdata->local, sdata);
2547
	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2548 2549
		tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
			   IEEE80211_TX_INTFL_MLME_CONN_TX;
2550
	ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
J
Johannes Berg 已提交
2551 2552 2553
			    elems.challenge - 2, elems.challenge_len + 2,
			    auth_data->bss->bssid, auth_data->bss->bssid,
			    auth_data->key, auth_data->key_len,
2554
			    auth_data->key_idx, tx_flags);
J
Johannes Berg 已提交
2555 2556
}

2557 2558
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
2559 2560 2561 2562 2563
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u8 bssid[ETH_ALEN];
	u16 auth_alg, auth_transaction, status_code;
	struct sta_info *sta;
2564 2565 2566 2567
	struct ieee80211_event event = {
		.type = MLME_EVENT,
		.u.mlme.data = AUTH_EVENT,
	};
J
Johannes Berg 已提交
2568

2569
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2570 2571

	if (len < 24 + 6)
2572
		return;
J
Johannes Berg 已提交
2573 2574

	if (!ifmgd->auth_data || ifmgd->auth_data->done)
2575
		return;
J
Johannes Berg 已提交
2576 2577 2578

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

2579
	if (!ether_addr_equal(bssid, mgmt->bssid))
2580
		return;
J
Johannes Berg 已提交
2581 2582 2583 2584 2585 2586

	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 ||
2587 2588 2589 2590 2591
	    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);
2592
		return;
2593
	}
J
Johannes Berg 已提交
2594 2595

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
2596 2597
		sdata_info(sdata, "%pM denied authentication (status %d)\n",
			   mgmt->sa, status_code);
2598
		ieee80211_destroy_auth_data(sdata, false);
2599
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2600 2601 2602
		event.u.mlme.status = MLME_DENIED;
		event.u.mlme.reason = status_code;
		drv_event_callback(sdata->local, sdata, &event);
2603
		return;
J
Johannes Berg 已提交
2604 2605 2606 2607 2608 2609
	}

	switch (ifmgd->auth_data->algorithm) {
	case WLAN_AUTH_OPEN:
	case WLAN_AUTH_LEAP:
	case WLAN_AUTH_FT:
2610
	case WLAN_AUTH_SAE:
J
Johannes Berg 已提交
2611 2612 2613 2614 2615
		break;
	case WLAN_AUTH_SHARED_KEY:
		if (ifmgd->auth_data->expected_transaction != 4) {
			ieee80211_auth_challenge(sdata, mgmt, len);
			/* need another frame */
2616
			return;
J
Johannes Berg 已提交
2617 2618 2619 2620 2621
		}
		break;
	default:
		WARN_ONCE(1, "invalid auth alg %d",
			  ifmgd->auth_data->algorithm);
2622
		return;
J
Johannes Berg 已提交
2623 2624
	}

2625 2626
	event.u.mlme.status = MLME_SUCCESS;
	drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
2627
	sdata_info(sdata, "authenticated\n");
J
Johannes Berg 已提交
2628 2629
	ifmgd->auth_data->done = true;
	ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2630
	ifmgd->auth_data->timeout_started = true;
2631
	run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
2632

2633 2634 2635 2636 2637 2638
	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.
		 */
2639
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2640
		return;
2641 2642
	}

J
Johannes Berg 已提交
2643 2644 2645 2646 2647 2648 2649 2650
	/* 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
2651
		sdata_info(sdata, "failed moving %pM to auth\n", bssid);
J
Johannes Berg 已提交
2652 2653 2654 2655
		goto out_err;
	}
	mutex_unlock(&sdata->local->sta_mtx);

2656
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2657
	return;
J
Johannes Berg 已提交
2658 2659 2660 2661 2662
 out_err:
	mutex_unlock(&sdata->local->sta_mtx);
	/* ignore frame -- wait for timeout */
}

2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718
#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
2719

2720 2721
static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
2722
{
2723
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2724
	u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2725

2726
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2727

2728
	if (len < 24 + 2)
2729
		return;
2730

2731 2732 2733
	if (ifmgd->associated &&
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
		const u8 *bssid = ifmgd->associated->bssid;
2734

2735 2736 2737
		sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
			   bssid, reason_code,
			   ieee80211_get_reason_code_string(reason_code));
2738

2739
		ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2740

2741 2742 2743 2744
		ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
					    reason_code);
		return;
	}
2745

2746 2747 2748
	if (ifmgd->assoc_data &&
	    ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
		const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2749

2750 2751 2752 2753 2754 2755 2756 2757 2758 2759
		sdata_info(sdata,
			   "deauthenticated from %pM while associating (Reason: %u=%s)\n",
			   bssid, reason_code,
			   ieee80211_get_reason_code_string(reason_code));

		ieee80211_destroy_assoc_data(sdata, false);

		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
		return;
	}
2760 2761 2762
}


2763 2764
static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_mgmt *mgmt, size_t len)
2765
{
2766
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2767 2768
	u16 reason_code;

2769
	sdata_assert_lock(sdata);
2770

J
Johannes Berg 已提交
2771
	if (len < 24 + 2)
2772
		return;
2773

J
Johannes Berg 已提交
2774
	if (!ifmgd->associated ||
2775
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2776
		return;
2777 2778 2779

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

J
Johannes Berg 已提交
2780 2781
	sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
		   mgmt->sa, reason_code);
2782

2783 2784
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2785
	ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2786 2787
}

2788 2789 2790 2791
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,
2792 2793
				int *min_rate, int *min_rate_index,
				int shift, u32 rate_flags)
2794 2795 2796 2797
{
	int i, j;

	for (i = 0; i < supp_rates_len; i++) {
2798
		int rate = supp_rates[i] & 0x7f;
2799 2800
		bool is_basic = !!(supp_rates[i] & 0x80);

2801
		if ((rate * 5 * (1 << shift)) > 110)
2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816
			*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++) {
2817 2818 2819 2820 2821 2822 2823 2824 2825
			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) {
2826 2827 2828
				*rates |= BIT(j);
				if (is_basic)
					*basic_rates |= BIT(j);
2829 2830
				if ((rate * 5) < *min_rate) {
					*min_rate = rate * 5;
2831 2832 2833 2834 2835 2836 2837
					*min_rate_index = j;
				}
				break;
			}
		}
	}
}
2838

J
Johannes Berg 已提交
2839 2840
static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
				    struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
2841
				    struct ieee80211_mgmt *mgmt, size_t len)
2842
{
2843
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2844
	struct ieee80211_local *local = sdata->local;
2845
	struct ieee80211_supported_band *sband;
2846
	struct sta_info *sta;
J
Johannes Berg 已提交
2847 2848
	u8 *pos;
	u16 capab_info, aid;
2849
	struct ieee802_11_elems elems;
J
Johannes Berg 已提交
2850
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2851 2852
	const struct cfg80211_bss_ies *bss_ies = NULL;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
J
Johannes Berg 已提交
2853
	u32 changed = 0;
2854
	int err;
2855
	bool ret;
2856

J
Johannes Berg 已提交
2857
	/* AssocResp and ReassocResp have identical structure */
2858 2859

	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
J
Johannes Berg 已提交
2860
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2861

2862
	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
J
Johannes Berg 已提交
2863 2864
		sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
			   aid);
2865 2866
	aid &= ~(BIT(15) | BIT(14));

2867 2868 2869
	ifmgd->broken_ap = false;

	if (aid == 0 || aid > IEEE80211_MAX_AID) {
J
Johannes Berg 已提交
2870 2871
		sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
			   aid);
2872 2873 2874 2875
		aid = 0;
		ifmgd->broken_ap = true;
	}

J
Johannes Berg 已提交
2876
	pos = mgmt->u.assoc_resp.variable;
2877
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2878

2879
	if (!elems.supp_rates) {
J
Johannes Berg 已提交
2880
		sdata_info(sdata, "no SuppRates element in AssocResp\n");
J
Johannes Berg 已提交
2881
		return false;
2882 2883
	}

2884
	ifmgd->aid = aid;
2885 2886 2887
	ifmgd->tdls_chan_switch_prohibited =
		elems.ext_capab && elems.ext_capab_len >= 5 &&
		(elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2888

2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951
	/*
	 * 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");
		}
	}

2952 2953 2954 2955 2956 2957 2958
	/*
	 * 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,
2959 2960 2961
			   "HT AP is missing WMM params or HT capability/operation\n");
		ret = false;
		goto out;
2962 2963 2964 2965 2966
	}

	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    (!elems.vht_cap_elem || !elems.vht_operation)) {
		sdata_info(sdata,
2967 2968 2969
			   "VHT AP is missing VHT capability/operation\n");
		ret = false;
		goto out;
2970 2971
	}

2972 2973 2974 2975 2976
	mutex_lock(&sdata->local->sta_mtx);
	/*
	 * station info was already allocated and inserted before
	 * the association and should be available to us
	 */
2977
	sta = sta_info_get(sdata, cbss->bssid);
2978 2979
	if (WARN_ON(!sta)) {
		mutex_unlock(&sdata->local->sta_mtx);
2980 2981
		ret = false;
		goto out;
2982
	}
2983

J
Johannes Berg 已提交
2984
	sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2985

2986
	/* Set up internal HT/VHT capabilities */
2987
	if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
B
Ben Greear 已提交
2988
		ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2989
						  elems.ht_cap_elem, sta);
2990

M
Mahesh Palivela 已提交
2991 2992
	if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
		ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2993
						    elems.vht_cap_elem, sta);
M
Mahesh Palivela 已提交
2994

2995 2996 2997 2998 2999 3000
	/*
	 * 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.
	 */
3001

3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016
	/*
	 * 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;
	}

3017
	rate_control_rate_init(sta);
3018

3019
	if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
J
Johannes Berg 已提交
3020
		set_sta_flag(sta, WLAN_STA_MFP);
3021

3022
	sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3023

3024
	err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3025 3026 3027
	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
3028 3029 3030
		sdata_info(sdata,
			   "failed to move station %pM to desired state\n",
			   sta->sta.addr);
3031 3032
		WARN_ON(__sta_info_destroy(sta));
		mutex_unlock(&sdata->local->sta_mtx);
3033 3034
		ret = false;
		goto out;
3035 3036
	}

3037
	mutex_unlock(&sdata->local->sta_mtx);
3038

3039 3040 3041 3042 3043 3044 3045 3046
	/*
	 * 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;

3047
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
3048
		ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
J
Johannes Berg 已提交
3049
					 elems.wmm_param_len);
3050
	else
3051 3052
		ieee80211_set_wmm_default(sdata, false);
	changed |= BSS_CHANGED_QOS;
3053

J
Johannes Berg 已提交
3054 3055 3056 3057
	/* set AID and assoc capability,
	 * ieee80211_set_associated() will tell the driver */
	bss_conf->aid = aid;
	bss_conf->assoc_capability = capab_info;
3058
	ieee80211_set_associated(sdata, cbss, changed);
3059

3060 3061 3062 3063 3064 3065 3066
	/*
	 * 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);

3067
	/*
J
Johannes Berg 已提交
3068 3069
	 * Start timer to probe the connection to the AP now.
	 * Also start the timer that will detect beacon loss.
3070
	 */
J
Johannes Berg 已提交
3071
	ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3072
	ieee80211_sta_reset_beacon_monitor(sdata);
3073

3074 3075 3076 3077
	ret = true;
 out:
	kfree(bss_ies);
	return ret;
3078 3079
}

3080 3081 3082
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
3083 3084 3085 3086 3087
{
	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;
3088
	int ac, uapsd_queues = -1;
J
Johannes Berg 已提交
3089 3090
	u8 *pos;
	bool reassoc;
3091
	struct cfg80211_bss *bss;
3092 3093 3094 3095
	struct ieee80211_event event = {
		.type = MLME_EVENT,
		.u.mlme.data = ASSOC_EVENT,
	};
J
Johannes Berg 已提交
3096

3097
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3098 3099

	if (!assoc_data)
3100
		return;
3101
	if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3102
		return;
J
Johannes Berg 已提交
3103 3104 3105 3106 3107 3108 3109

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

	if (len < 24 + 6)
3110
		return;
J
Johannes Berg 已提交
3111 3112 3113 3114 3115 3116

	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
3117 3118 3119 3120
	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
3121 3122

	pos = mgmt->u.assoc_resp.variable;
3123
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
3124 3125

	if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3126 3127
	    elems.timeout_int &&
	    elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
J
Johannes Berg 已提交
3128
		u32 tu, ms;
3129
		tu = le32_to_cpu(elems.timeout_int->value);
J
Johannes Berg 已提交
3130
		ms = tu * 1024 / 1000;
J
Johannes Berg 已提交
3131 3132 3133
		sdata_info(sdata,
			   "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
			   mgmt->sa, tu, ms);
J
Johannes Berg 已提交
3134
		assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3135
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
3136
		if (ms > IEEE80211_ASSOC_TIMEOUT)
3137 3138
			run_again(sdata, assoc_data->timeout);
		return;
J
Johannes Berg 已提交
3139 3140
	}

3141
	bss = assoc_data->bss;
J
Johannes Berg 已提交
3142 3143

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
3144 3145
		sdata_info(sdata, "%pM denied association (code=%d)\n",
			   mgmt->sa, status_code);
J
Johannes Berg 已提交
3146
		ieee80211_destroy_assoc_data(sdata, false);
3147 3148 3149
		event.u.mlme.status = MLME_DENIED;
		event.u.mlme.reason = status_code;
		drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
3150
	} else {
3151
		if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
J
Johannes Berg 已提交
3152
			/* oops -- internal error -- send timeout for now */
3153
			ieee80211_destroy_assoc_data(sdata, false);
3154
			cfg80211_assoc_timeout(sdata->dev, bss);
3155
			return;
J
Johannes Berg 已提交
3156
		}
3157 3158
		event.u.mlme.status = MLME_SUCCESS;
		drv_event_callback(sdata->local, sdata, &event);
3159
		sdata_info(sdata, "associated\n");
3160 3161 3162 3163 3164 3165 3166

		/*
		 * 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);
3167 3168 3169 3170 3171 3172

		/* 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
3173 3174
	}

3175
	cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
J
Johannes Berg 已提交
3176
}
J
Johannes Berg 已提交
3177

3178
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
3179
				  struct ieee80211_mgmt *mgmt, size_t len,
3180
				  struct ieee80211_rx_status *rx_status,
3181
				  struct ieee802_11_elems *elems)
3182 3183
{
	struct ieee80211_local *local = sdata->local;
3184
	struct ieee80211_bss *bss;
3185
	struct ieee80211_channel *channel;
3186

3187
	sdata_assert_lock(sdata);
3188

3189 3190
	channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
	if (!channel)
3191 3192 3193
		return;

	bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3194
					channel);
3195 3196
	if (bss) {
		sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3197
		ieee80211_rx_bss_put(local, bss);
3198
	}
3199 3200 3201
}


3202
static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
3203
					 struct sk_buff *skb)
3204
{
J
Johannes Berg 已提交
3205
	struct ieee80211_mgmt *mgmt = (void *)skb->data;
3206
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
3207 3208
	struct ieee80211_rx_status *rx_status = (void *) skb->cb;
	size_t baselen, len = skb->len;
3209 3210
	struct ieee802_11_elems elems;

3211 3212
	ifmgd = &sdata->u.mgd;

3213
	sdata_assert_lock(sdata);
3214

3215
	if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3216 3217
		return; /* ignore ProbeResp to foreign address */

3218 3219 3220 3221 3222
	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
	if (baselen > len)
		return;

	ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3223
			       false, &elems);
3224

3225
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3226

3227
	if (ifmgd->associated &&
3228
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3229
		ieee80211_reset_ap_probe(sdata);
J
Johannes Berg 已提交
3230 3231

	if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
3232
	    ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
J
Johannes Berg 已提交
3233
		/* got probe response, continue with auth */
J
Johannes Berg 已提交
3234
		sdata_info(sdata, "direct probe responded\n");
J
Johannes Berg 已提交
3235 3236
		ifmgd->auth_data->tries = 0;
		ifmgd->auth_data->timeout = jiffies;
3237
		ifmgd->auth_data->timeout_started = true;
3238
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
3239
	}
3240 3241
}

3242 3243 3244
/*
 * This is the canonical list of information elements we care about,
 * the filter code also gives us all changes to the Microsoft OUI
3245 3246 3247
 * (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.
3248 3249 3250 3251 3252 3253 3254 3255 3256 3257
 *
 * 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 =
3258 3259 3260 3261 3262
	(1ULL << WLAN_EID_COUNTRY) |
	(1ULL << WLAN_EID_ERP_INFO) |
	(1ULL << WLAN_EID_CHANNEL_SWITCH) |
	(1ULL << WLAN_EID_PWR_CONSTRAINT) |
	(1ULL << WLAN_EID_HT_CAPABILITY) |
3263 3264
	(1ULL << WLAN_EID_HT_OPERATION) |
	(1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3265

3266 3267 3268
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)
3269
{
3270
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3271
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3272 3273
	size_t baselen;
	struct ieee802_11_elems elems;
3274
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
3275 3276
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
3277
	struct sta_info *sta;
3278
	u32 changed = 0;
3279
	bool erp_valid;
J
Johannes Berg 已提交
3280
	u8 erp_value = 0;
3281
	u32 ncrc;
3282
	u8 *bssid;
3283
	u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3284

3285
	sdata_assert_lock(sdata);
3286

3287 3288 3289
	/* Process beacon from the current BSS */
	baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
	if (baselen > len)
3290
		return;
3291

J
Johannes Berg 已提交
3292 3293 3294 3295
	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		rcu_read_unlock();
3296
		return;
J
Johannes Berg 已提交
3297 3298
	}

3299
	if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
J
Johannes Berg 已提交
3300
		rcu_read_unlock();
3301
		return;
J
Johannes Berg 已提交
3302
	}
3303
	chan = chanctx_conf->def.chan;
J
Johannes Berg 已提交
3304
	rcu_read_unlock();
3305

3306
	if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3307
	    ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
J
Johannes Berg 已提交
3308
		ieee802_11_parse_elems(mgmt->u.beacon.variable,
3309
				       len - baselen, false, &elems);
3310

3311
		ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3312 3313 3314 3315
		if (elems.tim && !elems.parse_error) {
			const struct ieee80211_tim_ie *tim_ie = elems.tim;
			ifmgd->dtim_period = tim_ie->dtim_period;
		}
3316
		ifmgd->have_beacon = true;
3317
		ifmgd->assoc_data->need_beacon = false;
3318
		if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3319 3320 3321 3322 3323 3324 3325 3326 3327 3328
			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
3329 3330
		/* continue assoc process */
		ifmgd->assoc_data->timeout = jiffies;
3331
		ifmgd->assoc_data->timeout_started = true;
3332 3333
		run_again(sdata, ifmgd->assoc_data->timeout);
		return;
J
Johannes Berg 已提交
3334
	}
3335

J
Johannes Berg 已提交
3336
	if (!ifmgd->associated ||
3337
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3338
		return;
J
Johannes Berg 已提交
3339
	bssid = ifmgd->associated->bssid;
3340

3341 3342 3343 3344
	/* 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;
3345
		ifmgd->ave_beacon_signal = rx_status->signal * 16;
3346
		ifmgd->last_cqm_event_signal = 0;
3347
		ifmgd->count_beacon_signal = 1;
3348
		ifmgd->last_ave_beacon_signal = 0;
3349 3350 3351 3352 3353
	} else {
		ifmgd->ave_beacon_signal =
			(IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
			 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
			 ifmgd->ave_beacon_signal) / 16;
3354
		ifmgd->count_beacon_signal++;
3355
	}
3356 3357 3358 3359 3360

	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;
3361 3362 3363
		struct ieee80211_event event = {
			.type = RSSI_EVENT,
		};
3364 3365 3366 3367 3368 3369 3370 3371

		/*
		 * 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;
3372 3373
			event.u.rssi.data = RSSI_EVENT_HIGH;
			drv_event_callback(local, sdata, &event);
3374 3375 3376 3377
		} else if (sig < ifmgd->rssi_min_thold &&
			   (last_sig >= ifmgd->rssi_max_thold ||
			   last_sig == 0)) {
			ifmgd->last_ave_beacon_signal = sig;
3378 3379
			event.u.rssi.data = RSSI_EVENT_LOW;
			drv_event_callback(local, sdata, &event);
3380 3381 3382
		}
	}

3383
	if (bss_conf->cqm_rssi_thold &&
3384
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3385
	    !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406
		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);
		}
	}

3407
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
J
Johannes Berg 已提交
3408
		mlme_dbg_ratelimited(sdata,
3409
				     "cancelling AP probe due to a received beacon\n");
3410
		ieee80211_reset_ap_probe(sdata);
3411 3412
	}

J
Johannes Berg 已提交
3413 3414 3415 3416
	/*
	 * Push the beacon loss detection into the future since
	 * we are processing a beacon from the AP just now.
	 */
3417
	ieee80211_sta_reset_beacon_monitor(sdata);
J
Johannes Berg 已提交
3418

3419 3420
	ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
	ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3421
					  len - baselen, false, &elems,
3422 3423
					  care_about_ies, ncrc);

3424
	if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) {
3425 3426 3427
		bool directed_tim = ieee80211_check_tim(elems.tim,
							elems.tim_len,
							ifmgd->aid);
3428
		if (directed_tim) {
3429
			if (local->hw.conf.dynamic_ps_timeout > 0) {
3430 3431 3432 3433 3434
				if (local->hw.conf.flags & IEEE80211_CONF_PS) {
					local->hw.conf.flags &= ~IEEE80211_CONF_PS;
					ieee80211_hw_config(local,
							    IEEE80211_CONF_CHANGE_PS);
				}
3435
				ieee80211_send_nullfunc(local, sdata, 0);
3436
			} else if (!local->pspolling && sdata->u.mgd.powersave) {
3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448
				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);
			}
3449 3450
		}
	}
J
Johannes Berg 已提交
3451

3452
	if (sdata->vif.p2p) {
J
Janusz Dziedzic 已提交
3453
		struct ieee80211_p2p_noa_attr noa = {};
3454 3455 3456 3457 3458
		int ret;

		ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
					    len - baselen,
					    IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3459
					    (u8 *) &noa, sizeof(noa));
J
Janusz Dziedzic 已提交
3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475
		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));
3476 3477 3478 3479 3480
			changed |= BSS_CHANGED_P2P_PS;
			ifmgd->beacon_crc_valid = false;
		}
	}

3481 3482 3483
	if (ifmgd->csa_waiting_bcn)
		ieee80211_chswitch_post_beacon(sdata);

3484 3485 3486 3487 3488 3489 3490 3491
	/*
	 * Update beacon timing and dtim count on every beacon appearance. This
	 * will allow the driver to use the most updated values. Do it before
	 * comparing this one with last received beacon.
	 * IMPORTANT: These parameters would possibly be out of sync by the time
	 * the driver will use them. The synchronized view is currently
	 * guaranteed only in certain callbacks.
	 */
3492
	if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503
		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;
	}

3504
	if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3505
		return;
3506
	ifmgd->beacon_crc = ncrc;
3507
	ifmgd->beacon_crc_valid = true;
3508

3509
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3510

3511
	ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3512
					 rx_status->device_timestamp,
3513 3514
					 &elems, true);

3515 3516
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
	    ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3517 3518 3519
				     elems.wmm_param_len))
		changed |= BSS_CHANGED_QOS;

3520 3521
	/*
	 * If we haven't had a beacon before, tell the driver about the
3522
	 * DTIM period (and beacon timing if desired) now.
3523
	 */
3524
	if (!ifmgd->have_beacon) {
3525 3526 3527 3528 3529
		/* 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;
3530

3531 3532
		changed |= BSS_CHANGED_BEACON_INFO;
		ifmgd->have_beacon = true;
3533 3534 3535 3536 3537

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

3538
		ieee80211_recalc_ps_vif(sdata);
3539 3540
	}

3541
	if (elems.erp_info) {
J
Johannes Berg 已提交
3542 3543 3544 3545
		erp_valid = true;
		erp_value = elems.erp_info[0];
	} else {
		erp_valid = false;
3546
	}
J
Johannes Berg 已提交
3547 3548 3549
	changed |= ieee80211_handle_bss_capability(sdata,
			le16_to_cpu(mgmt->u.beacon.capab_info),
			erp_valid, erp_value);
3550

3551
	mutex_lock(&local->sta_mtx);
3552 3553
	sta = sta_info_get(sdata, bssid);

3554 3555
	if (ieee80211_config_bw(sdata, sta,
				elems.ht_cap_elem, elems.ht_operation,
3556 3557 3558 3559 3560
				elems.vht_operation, bssid, &changed)) {
		mutex_unlock(&local->sta_mtx);
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_DEAUTH_LEAVING,
				       true, deauth_buf);
3561 3562 3563
		ieee80211_report_disconnect(sdata, deauth_buf,
					    sizeof(deauth_buf), true,
					    WLAN_REASON_DEAUTH_LEAVING);
3564
		return;
3565
	}
3566 3567 3568 3569

	if (sta && elems.opmode_notif)
		ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
					    rx_status->band, true);
3570
	mutex_unlock(&local->sta_mtx);
3571

3572 3573 3574
	changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
					       elems.country_elem,
					       elems.country_elem_len,
3575 3576
					       elems.pwr_constr_elem,
					       elems.cisco_dtpc_elem);
3577

3578
	ieee80211_bss_info_change_notify(sdata, changed);
3579 3580
}

3581 3582
void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
				  struct sk_buff *skb)
3583 3584 3585 3586
{
	struct ieee80211_rx_status *rx_status;
	struct ieee80211_mgmt *mgmt;
	u16 fc;
3587 3588
	struct ieee802_11_elems elems;
	int ies_len;
3589 3590 3591 3592 3593

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

3594
	sdata_lock(sdata);
3595

J
Johannes Berg 已提交
3596 3597
	switch (fc & IEEE80211_FCTL_STYPE) {
	case IEEE80211_STYPE_BEACON:
3598
		ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
J
Johannes Berg 已提交
3599 3600 3601 3602 3603
		break;
	case IEEE80211_STYPE_PROBE_RESP:
		ieee80211_rx_mgmt_probe_resp(sdata, skb);
		break;
	case IEEE80211_STYPE_AUTH:
3604
		ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3605 3606
		break;
	case IEEE80211_STYPE_DEAUTH:
3607
		ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3608 3609
		break;
	case IEEE80211_STYPE_DISASSOC:
3610
		ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3611 3612 3613
		break;
	case IEEE80211_STYPE_ASSOC_RESP:
	case IEEE80211_STYPE_REASSOC_RESP:
3614
		ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3615 3616
		break;
	case IEEE80211_STYPE_ACTION:
3617
		if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3618 3619 3620
			ies_len = skb->len -
				  offsetof(struct ieee80211_mgmt,
					   u.action.u.chan_switch.variable);
3621 3622 3623 3624 3625 3626

			if (ies_len < 0)
				break;

			ieee802_11_parse_elems(
				mgmt->u.action.u.chan_switch.variable,
3627
				ies_len, true, &elems);
3628 3629 3630 3631

			if (elems.parse_error)
				break;

3632
			ieee80211_sta_process_chanswitch(sdata,
3633 3634 3635
						 rx_status->mactime,
						 rx_status->device_timestamp,
						 &elems, false);
3636 3637 3638 3639 3640 3641 3642 3643 3644 3645
		} 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,
3646
				ies_len, true, &elems);
3647 3648 3649 3650 3651 3652 3653 3654

			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
3655
			ieee80211_sta_process_chanswitch(sdata,
3656 3657 3658
						 rx_status->mactime,
						 rx_status->device_timestamp,
						 &elems, false);
3659
		}
3660
		break;
3661
	}
3662
	sdata_unlock(sdata);
3663 3664
}

J
Johannes Berg 已提交
3665
static void ieee80211_sta_timer(unsigned long data)
3666
{
J
Johannes Berg 已提交
3667 3668
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
3669

3670
	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3671 3672
}

3673
static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3674
					  u8 *bssid, u8 reason, bool tx)
3675
{
3676
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3677

3678
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3679
			       tx, frame_buf);
3680

3681 3682
	ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
				    reason);
3683 3684
}

J
Johannes Berg 已提交
3685 3686 3687 3688 3689
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;
3690
	u32 tx_flags = 0;
J
Johannes Berg 已提交
3691

3692
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3693 3694 3695 3696 3697 3698 3699

	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
3700 3701
		sdata_info(sdata, "authentication with %pM timed out\n",
			   auth_data->bss->bssid);
J
Johannes Berg 已提交
3702 3703 3704 3705 3706 3707 3708 3709 3710 3711

		/*
		 * 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
3712 3713
	drv_mgd_prepare_tx(local, sdata);

J
Johannes Berg 已提交
3714
	if (auth_data->bss->proberesp_ies) {
3715 3716 3717
		u16 trans = 1;
		u16 status = 0;

J
Johannes Berg 已提交
3718 3719 3720
		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
3721 3722

		auth_data->expected_transaction = 2;
3723 3724 3725 3726 3727 3728 3729

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

3730
		if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3731 3732 3733
			tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
				   IEEE80211_TX_INTFL_MLME_CONN_TX;

3734 3735
		ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
				    auth_data->data, auth_data->data_len,
J
Johannes Berg 已提交
3736
				    auth_data->bss->bssid,
3737 3738
				    auth_data->bss->bssid, NULL, 0, 0,
				    tx_flags);
J
Johannes Berg 已提交
3739 3740 3741
	} else {
		const u8 *ssidie;

J
Johannes Berg 已提交
3742 3743 3744
		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
3745

3746
		rcu_read_lock();
J
Johannes Berg 已提交
3747
		ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3748 3749
		if (!ssidie) {
			rcu_read_unlock();
J
Johannes Berg 已提交
3750
			return -EINVAL;
3751
		}
J
Johannes Berg 已提交
3752 3753 3754 3755
		/*
		 * Direct probe is sent to broadcast address as some APs
		 * will not answer to direct packet in unassociated state.
		 */
3756 3757
		ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL,
					 ssidie + 2, ssidie[1],
3758
					 NULL, 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
3759
					 auth_data->bss->channel, false);
3760
		rcu_read_unlock();
J
Johannes Berg 已提交
3761 3762
	}

3763
	if (tx_flags == 0) {
3764
		auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3765
		auth_data->timeout_started = true;
3766
		run_again(sdata, auth_data->timeout);
3767
	} else {
3768 3769 3770 3771
		auth_data->timeout =
			round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
		auth_data->timeout_started = true;
		run_again(sdata, auth_data->timeout);
3772
	}
J
Johannes Berg 已提交
3773 3774 3775 3776 3777 3778 3779 3780 3781

	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;

3782
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3783 3784 3785

	assoc_data->tries++;
	if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
J
Johannes Berg 已提交
3786 3787
		sdata_info(sdata, "association with %pM timed out\n",
			   assoc_data->bss->bssid);
J
Johannes Berg 已提交
3788 3789 3790 3791 3792 3793 3794 3795 3796 3797

		/*
		 * 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
3798 3799 3800
	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
3801 3802
	ieee80211_send_assoc(sdata);

3803
	if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3804
		assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3805
		assoc_data->timeout_started = true;
3806
		run_again(sdata, assoc_data->timeout);
3807
	} else {
3808 3809 3810 3811 3812
		assoc_data->timeout =
			round_jiffies_up(jiffies +
					 IEEE80211_ASSOC_TIMEOUT_LONG);
		assoc_data->timeout_started = true;
		run_again(sdata, assoc_data->timeout);
3813
	}
J
Johannes Berg 已提交
3814 3815 3816 3817

	return 0;
}

3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829
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);
}

3830
void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
3831 3832
{
	struct ieee80211_local *local = sdata->local;
3833
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3834

3835
	sdata_lock(sdata);
3836

3837 3838 3839 3840 3841 3842 3843 3844 3845 3846
	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;
3847
				run_again(sdata, ifmgd->auth_data->timeout);
3848 3849 3850
			} else {
				ifmgd->auth_data->timeout = jiffies - 1;
			}
3851
			ifmgd->auth_data->timeout_started = true;
3852 3853 3854 3855 3856 3857
		} 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;
3858
				run_again(sdata, ifmgd->assoc_data->timeout);
3859 3860 3861
			} else {
				ifmgd->assoc_data->timeout = jiffies - 1;
			}
3862
			ifmgd->assoc_data->timeout_started = true;
3863 3864 3865
		}
	}

3866
	if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
J
Johannes Berg 已提交
3867 3868 3869 3870 3871 3872 3873 3874 3875
	    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];
3876 3877 3878 3879 3880
			struct ieee80211_event event = {
				.type = MLME_EVENT,
				.u.mlme.data = AUTH_EVENT,
				.u.mlme.status = MLME_TIMEOUT,
			};
J
Johannes Berg 已提交
3881 3882 3883 3884 3885

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

			ieee80211_destroy_auth_data(sdata, false);

3886
			cfg80211_auth_timeout(sdata->dev, bssid);
3887
			drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
3888
		}
3889
	} else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3890
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
3891

3892
	if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
J
Johannes Berg 已提交
3893
	    time_after(jiffies, ifmgd->assoc_data->timeout)) {
3894
		if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
J
Johannes Berg 已提交
3895
		    ieee80211_do_assoc(sdata)) {
3896
			struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3897 3898 3899 3900 3901
			struct ieee80211_event event = {
				.type = MLME_EVENT,
				.u.mlme.data = ASSOC_EVENT,
				.u.mlme.status = MLME_TIMEOUT,
			};
J
Johannes Berg 已提交
3902 3903

			ieee80211_destroy_assoc_data(sdata, false);
3904
			cfg80211_assoc_timeout(sdata->dev, bss);
3905
			drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
3906
		}
3907
	} else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3908
		run_again(sdata, ifmgd->assoc_data->timeout);
J
Johannes Berg 已提交
3909

3910
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
J
Johannes Berg 已提交
3911
	    ifmgd->associated) {
3912
		u8 bssid[ETH_ALEN];
3913
		int max_tries;
3914

3915
		memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3916

3917
		if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3918
			max_tries = max_nullfunc_tries;
3919
		else
3920
			max_tries = max_probe_tries;
3921

3922 3923 3924
		/* ACK received for nullfunc probing frame */
		if (!ifmgd->probe_send_count)
			ieee80211_reset_ap_probe(sdata);
3925 3926
		else if (ifmgd->nullfunc_failed) {
			if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3927 3928 3929 3930
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
					 bssid, ifmgd->probe_send_count,
					 max_tries);
3931 3932
				ieee80211_mgd_probe_ap_send(sdata);
			} else {
J
Johannes Berg 已提交
3933 3934 3935
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
					 bssid);
3936
				ieee80211_sta_connection_lost(sdata, bssid,
3937 3938
					WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
					false);
3939 3940
			}
		} else if (time_is_after_jiffies(ifmgd->probe_timeout))
3941
			run_again(sdata, ifmgd->probe_timeout);
3942
		else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
J
Johannes Berg 已提交
3943 3944 3945
			mlme_dbg(sdata,
				 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
				 bssid, probe_wait_ms);
3946
			ieee80211_sta_connection_lost(sdata, bssid,
3947
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3948
		} else if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3949 3950 3951 3952
			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);
3953 3954
			ieee80211_mgd_probe_ap_send(sdata);
		} else {
J
Johannes Berg 已提交
3955 3956 3957 3958
			/*
			 * We actually lost the connection ... or did we?
			 * Let's make sure!
			 */
3959 3960 3961 3962
			wiphy_debug(local->hw.wiphy,
				    "%s: No probe response from AP %pM"
				    " after %dms, disconnecting.\n",
				    sdata->name,
3963
				    bssid, probe_wait_ms);
3964

3965
			ieee80211_sta_connection_lost(sdata, bssid,
3966
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
J
Johannes Berg 已提交
3967 3968 3969
		}
	}

3970
	sdata_unlock(sdata);
3971 3972
}

J
Johannes Berg 已提交
3973 3974 3975 3976
static void ieee80211_sta_bcn_mon_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
3977
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3978

3979
	if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
M
Michal Kazior 已提交
3980 3981
		return;

3982
	sdata->u.mgd.connection_loss = false;
3983 3984
	ieee80211_queue_work(&sdata->local->hw,
			     &sdata->u.mgd.beacon_connection_loss_work);
J
Johannes Berg 已提交
3985 3986 3987 3988 3989 3990 3991 3992 3993
}

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;

3994
	if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
M
Michal Kazior 已提交
3995 3996
		return;

3997
	ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
J
Johannes Berg 已提交
3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008
}

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
4009 4010
static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
4011
	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4012
		__ieee80211_stop_poll(sdata);
4013

J
Johannes Berg 已提交
4014
		/* let's probe the connection once */
4015
		if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4016 4017
			ieee80211_queue_work(&sdata->local->hw,
					     &sdata->u.mgd.monitor_work);
J
Johannes Berg 已提交
4018
		/* and do all the other regular work too */
J
Johannes Berg 已提交
4019
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
4020
	}
J
Johannes Berg 已提交
4021
}
4022

4023
#ifdef CONFIG_PM
4024 4025 4026 4027 4028 4029 4030
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);

4031 4032 4033 4034 4035
	if (ifmgd->auth_data || ifmgd->assoc_data) {
		const u8 *bssid = ifmgd->auth_data ?
				ifmgd->auth_data->bss->bssid :
				ifmgd->assoc_data->bss->bssid;

4036
		/*
4037 4038 4039
		 * 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.
4040
		 */
4041
		ieee80211_send_deauth_disassoc(sdata, bssid,
4042 4043 4044
					       IEEE80211_STYPE_DEAUTH,
					       WLAN_REASON_DEAUTH_LEAVING,
					       false, frame_buf);
4045 4046 4047 4048
		if (ifmgd->assoc_data)
			ieee80211_destroy_assoc_data(sdata, false);
		if (ifmgd->auth_data)
			ieee80211_destroy_auth_data(sdata, false);
4049 4050 4051 4052
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
	}

4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080
	/* This is a bit of a hack - we should find a better and more generic
	 * solution to this. Normally when suspending, cfg80211 will in fact
	 * deauthenticate. However, it doesn't (and cannot) stop an ongoing
	 * auth (not so important) or assoc (this is the problem) process.
	 *
	 * As a consequence, it can happen that we are in the process of both
	 * associating and suspending, and receive an association response
	 * after cfg80211 has checked if it needs to disconnect, but before
	 * we actually set the flag to drop incoming frames. This will then
	 * cause the workqueue flush to process the association response in
	 * the suspend, resulting in a successful association just before it
	 * tries to remove the interface from the driver, which now though
	 * has a channel context assigned ... this results in issues.
	 *
	 * To work around this (for now) simply deauth here again if we're
	 * now connected.
	 */
	if (ifmgd->associated && !sdata->local->wowlan) {
		u8 bssid[ETH_ALEN];
		struct cfg80211_deauth_request req = {
			.reason_code = WLAN_REASON_DEAUTH_LEAVING,
			.bssid = bssid,
		};

		memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
		ieee80211_mgd_deauth(sdata, &req);
	}

4081 4082 4083
	sdata_unlock(sdata);
}

4084 4085 4086 4087
void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

4088
	sdata_lock(sdata);
4089
	if (!ifmgd->associated) {
4090
		sdata_unlock(sdata);
4091 4092 4093 4094 4095 4096 4097 4098 4099 4100
		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);
4101
		sdata_unlock(sdata);
4102 4103
		return;
	}
4104
	sdata_unlock(sdata);
4105 4106 4107
}
#endif

J
Johannes Berg 已提交
4108 4109
/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4110
{
4111
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
4112

4113
	ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
4114
	INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4115
	INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4116 4117
	INIT_WORK(&ifmgd->beacon_connection_loss_work,
		  ieee80211_beacon_connection_loss_work);
4118 4119
	INIT_WORK(&ifmgd->csa_connection_drop_work,
		  ieee80211_csa_connection_drop_work);
4120
	INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4121 4122
	INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
			  ieee80211_tdls_peer_del_work);
4123
	setup_timer(&ifmgd->timer, ieee80211_sta_timer,
S
Sujith 已提交
4124
		    (unsigned long) sdata);
J
Johannes Berg 已提交
4125 4126 4127 4128
	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);
4129
	setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
J
Johannes Berg 已提交
4130
		    (unsigned long) sdata);
4131 4132
	INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
			  ieee80211_sta_handle_tspec_ac_params_wk);
J
Johannes Berg 已提交
4133

4134
	ifmgd->flags = 0;
4135
	ifmgd->powersave = sdata->wdev.ps;
4136 4137
	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
4138
	ifmgd->p2p_noa_index = -1;
J
Johannes Berg 已提交
4139

4140
	if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4141 4142 4143
		ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
	else
		ifmgd->req_smps = IEEE80211_SMPS_OFF;
4144 4145 4146 4147 4148

	/* Setup TDLS data */
	spin_lock_init(&ifmgd->teardown_lock);
	ifmgd->teardown_skb = NULL;
	ifmgd->orig_teardown_skb = NULL;
4149 4150
}

4151 4152
/* scan finished notification */
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
J
Johannes Berg 已提交
4153
{
4154
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
4155

4156 4157
	/* Restart STA timers */
	rcu_read_lock();
4158 4159 4160 4161
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (ieee80211_sdata_running(sdata))
			ieee80211_restart_sta_timer(sdata);
	}
4162 4163
	rcu_read_unlock();
}
J
Johannes Berg 已提交
4164

4165 4166 4167 4168 4169 4170 4171
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);
4172

4173 4174 4175
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, latency_usec);
	mutex_unlock(&local->iflist_mtx);
4176

4177
	return NOTIFY_OK;
J
Johannes Berg 已提交
4178 4179
}

J
Johannes Berg 已提交
4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191
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;

4192
	ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
J
Johannes Berg 已提交
4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204
	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;

4205
	vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
J
Johannes Berg 已提交
4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223
	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;
}

4224 4225
static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
				  struct cfg80211_bss *cbss)
4226 4227 4228
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4229
	const struct ieee80211_ht_cap *ht_cap = NULL;
4230
	const struct ieee80211_ht_operation *ht_oper = NULL;
J
Johannes Berg 已提交
4231
	const struct ieee80211_vht_operation *vht_oper = NULL;
4232
	struct ieee80211_supported_band *sband;
4233
	struct cfg80211_chan_def chandef;
J
Johannes Berg 已提交
4234
	int ret;
4235

4236 4237
	sband = local->hw.wiphy->bands[cbss->channel->band];

J
Johannes Berg 已提交
4238 4239 4240 4241
	ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
			  IEEE80211_STA_DISABLE_80P80MHZ |
			  IEEE80211_STA_DISABLE_160MHZ);

4242 4243
	rcu_read_lock();

J
Johannes Berg 已提交
4244 4245
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	    sband->ht_cap.ht_supported) {
4246
		const u8 *ht_oper_ie, *ht_cap_ie;
4247

4248
		ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4249 4250
		if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
			ht_oper = (void *)(ht_oper_ie + 2);
4251

4252 4253 4254 4255 4256
		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) {
4257 4258 4259
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ht_oper = NULL;
		}
4260 4261
	}

J
Johannes Berg 已提交
4262 4263
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    sband->vht_cap.vht_supported) {
4264
		const u8 *vht_oper_ie, *vht_cap;
J
Johannes Berg 已提交
4265

4266 4267
		vht_oper_ie = ieee80211_bss_get_ie(cbss,
						   WLAN_EID_VHT_OPERATION);
J
Johannes Berg 已提交
4268 4269 4270 4271
		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
4272
			sdata_info(sdata,
J
Johannes Berg 已提交
4273
				   "AP advertised VHT without HT, disabling both\n");
4274 4275
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4276
		}
4277 4278 4279 4280 4281 4282

		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;
		}
4283 4284
	}

J
Johannes Berg 已提交
4285 4286
	ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
						     cbss->channel,
4287
						     ht_cap, ht_oper, vht_oper,
4288
						     &chandef, false);
4289

J
Johannes Berg 已提交
4290 4291
	sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
				      local->rx_chains);
4292

4293 4294
	rcu_read_unlock();

4295 4296 4297
	/* will change later if needed */
	sdata->smps_mode = IEEE80211_SMPS_OFF;

4298
	mutex_lock(&local->mtx);
J
Johannes Berg 已提交
4299 4300 4301 4302 4303 4304 4305
	/*
	 * 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);
4306 4307 4308 4309

	/* don't downgrade for 5 and 10 MHz channels, though. */
	if (chandef.width == NL80211_CHAN_WIDTH_5 ||
	    chandef.width == NL80211_CHAN_WIDTH_10)
4310
		goto out;
4311

4312
	while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4313
		ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4314 4315 4316
		ret = ieee80211_vif_use_channel(sdata, &chandef,
						IEEE80211_CHANCTX_SHARED);
	}
4317 4318
 out:
	mutex_unlock(&local->mtx);
J
Johannes Berg 已提交
4319
	return ret;
4320 4321 4322
}

static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4323 4324
				     struct cfg80211_bss *cbss, bool assoc,
				     bool override)
4325 4326 4327 4328 4329
{
	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;
4330
	struct ieee80211_supported_band *sband;
4331
	bool have_sta = false;
4332 4333
	int err;

4334 4335
	sband = local->hw.wiphy->bands[cbss->channel->band];

4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349
	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;
	}
4350

4351
	if (new_sta || override) {
4352 4353 4354 4355 4356 4357 4358 4359
		err = ieee80211_prep_channel(sdata, cbss);
		if (err) {
			if (new_sta)
				sta_info_free(local, new_sta);
			return -EINVAL;
		}
	}

J
Johannes Berg 已提交
4360
	if (new_sta) {
4361 4362 4363
		u32 rates = 0, basic_rates = 0;
		bool have_higher_than_11mbit;
		int min_rate = INT_MAX, min_rate_index = -1;
4364
		struct ieee80211_chanctx_conf *chanctx_conf;
J
Johannes Berg 已提交
4365
		const struct cfg80211_bss_ies *ies;
4366
		int shift = ieee80211_vif_get_shift(&sdata->vif);
4367
		u32 rate_flags;
4368

4369 4370 4371 4372
		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
4373
			sta_info_free(local, new_sta);
4374 4375 4376 4377
			return -EINVAL;
		}
		rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
		rcu_read_unlock();
4378 4379 4380 4381 4382

		ieee80211_get_rates(sband, bss->supp_rates,
				    bss->supp_rates_len,
				    &rates, &basic_rates,
				    &have_higher_than_11mbit,
4383 4384
				    &min_rate, &min_rate_index,
				    shift, rate_flags);
4385 4386 4387 4388 4389 4390 4391 4392 4393 4394

		/*
		 * 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
4395 4396
			sdata_info(sdata,
				   "No basic rates, using min rate instead\n");
4397 4398 4399
			basic_rates = BIT(min_rate_index);
		}

J
Johannes Berg 已提交
4400
		new_sta->sta.supp_rates[cbss->channel->band] = rates;
4401 4402 4403
		sdata->vif.bss_conf.basic_rates = basic_rates;

		/* cf. IEEE 802.11 9.2.12 */
J
Johannes Berg 已提交
4404
		if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4405 4406 4407 4408 4409 4410 4411
		    have_higher_than_11mbit)
			sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
		else
			sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

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

4412 4413
		/* set timing information */
		sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
J
Johannes Berg 已提交
4414
		rcu_read_lock();
4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427
		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;
4428 4429
		} else if (!ieee80211_hw_check(&sdata->local->hw,
					       TIMING_BEACON_ONLY)) {
4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440
			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
4441
		rcu_read_unlock();
4442 4443

		/* tell driver about BSSID, basic rates and timing */
4444
		ieee80211_bss_info_change_notify(sdata,
4445 4446
			BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
			BSS_CHANGED_BEACON_INT);
4447 4448

		if (assoc)
J
Johannes Berg 已提交
4449
			sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4450

J
Johannes Berg 已提交
4451 4452
		err = sta_info_insert(new_sta);
		new_sta = NULL;
4453
		if (err) {
J
Johannes Berg 已提交
4454 4455 4456
			sdata_info(sdata,
				   "failed to insert STA entry for the AP (error %d)\n",
				   err);
4457 4458 4459
			return err;
		}
	} else
4460
		WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4461

4462 4463 4464 4465
	/* Cancel scan to ensure that nothing interferes with connection */
	if (local->scanning)
		ieee80211_scan_cancel(local);

4466 4467 4468
	return 0;
}

4469 4470 4471
/* config hooks */
int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
		       struct cfg80211_auth_request *req)
J
Johannes Berg 已提交
4472
{
J
Johannes Berg 已提交
4473 4474 4475
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data;
4476
	u16 auth_alg;
J
Johannes Berg 已提交
4477 4478 4479
	int err;

	/* prepare auth data structure */
J
Johannes Berg 已提交
4480

4481 4482 4483 4484 4485
	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
4486
		if (IS_ERR(local->wep_tx_tfm))
4487
			return -EOPNOTSUPP;
4488 4489 4490 4491 4492 4493 4494 4495
		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;
4496 4497 4498
	case NL80211_AUTHTYPE_SAE:
		auth_alg = WLAN_AUTH_SAE;
		break;
4499 4500
	default:
		return -EOPNOTSUPP;
J
Johannes Berg 已提交
4501
	}
4502

4503 4504
	auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
			    req->ie_len, GFP_KERNEL);
J
Johannes Berg 已提交
4505
	if (!auth_data)
J
Johannes Berg 已提交
4506
		return -ENOMEM;
4507

J
Johannes Berg 已提交
4508
	auth_data->bss = req->bss;
4509

4510 4511 4512 4513 4514 4515 4516 4517 4518
	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;
	}

4519
	if (req->ie && req->ie_len) {
4520 4521 4522
		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
4523
	}
4524

J
Johannes Berg 已提交
4525
	if (req->key && req->key_len) {
J
Johannes Berg 已提交
4526 4527 4528
		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
4529 4530
	}

J
Johannes Berg 已提交
4531
	auth_data->algorithm = auth_alg;
J
Johannes Berg 已提交
4532

J
Johannes Berg 已提交
4533
	/* try to authenticate/probe */
4534

J
Johannes Berg 已提交
4535 4536 4537 4538
	if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
	    ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
4539 4540
	}

J
Johannes Berg 已提交
4541 4542
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
4543

J
Johannes Berg 已提交
4544 4545
	/* prep auth_data so we don't go into idle on disassoc */
	ifmgd->auth_data = auth_data;
J
Johannes Berg 已提交
4546

4547 4548 4549 4550 4551 4552 4553
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

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

4554 4555 4556
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    WLAN_REASON_UNSPECIFIED);
4557
	}
J
Johannes Berg 已提交
4558

J
Johannes Berg 已提交
4559
	sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4560

4561
	err = ieee80211_prep_connection(sdata, req->bss, false, false);
4562
	if (err)
J
Johannes Berg 已提交
4563
		goto err_clear;
J
Johannes Berg 已提交
4564

J
Johannes Berg 已提交
4565 4566 4567 4568 4569 4570 4571
	err = ieee80211_probe_auth(sdata);
	if (err) {
		sta_info_destroy_addr(sdata, req->bss->bssid);
		goto err_clear;
	}

	/* hold our own reference */
4572
	cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4573
	return 0;
J
Johannes Berg 已提交
4574 4575

 err_clear:
4576
	eth_zero_addr(ifmgd->bssid);
4577
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4578
	ifmgd->auth_data = NULL;
4579 4580 4581
	mutex_lock(&sdata->local->mtx);
	ieee80211_vif_release_channel(sdata);
	mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
4582 4583 4584
 err_free:
	kfree(auth_data);
	return err;
J
Johannes Berg 已提交
4585 4586
}

4587 4588 4589 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624
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;
}

4625 4626
int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
			struct cfg80211_assoc_request *req)
4627
{
J
Johannes Berg 已提交
4628
	struct ieee80211_local *local = sdata->local;
4629
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4630
	struct ieee80211_bss *bss = (void *)req->bss->priv;
J
Johannes Berg 已提交
4631
	struct ieee80211_mgd_assoc_data *assoc_data;
4632
	const struct cfg80211_bss_ies *beacon_ies;
J
Johannes Berg 已提交
4633
	struct ieee80211_supported_band *sband;
4634
	const u8 *ssidie, *ht_ie, *vht_ie;
4635
	int i, err;
4636
	bool override = false;
4637

J
Johannes Berg 已提交
4638 4639 4640 4641
	assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
	if (!assoc_data)
		return -ENOMEM;

4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652
	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();

4653 4654 4655 4656 4657 4658 4659
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

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

4660 4661 4662
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    WLAN_REASON_UNSPECIFIED);
4663
	}
J
Johannes Berg 已提交
4664 4665 4666 4667

	if (ifmgd->auth_data && !ifmgd->auth_data->done) {
		err = -EBUSY;
		goto err_free;
J
Johannes Berg 已提交
4668
	}
4669

J
Johannes Berg 已提交
4670 4671 4672 4673
	if (ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
	}
4674

J
Johannes Berg 已提交
4675 4676 4677 4678
	if (ifmgd->auth_data) {
		bool match;

		/* keep sta info, bssid if matching */
4679
		match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
J
Johannes Berg 已提交
4680
		ieee80211_destroy_auth_data(sdata, match);
4681 4682
	}

J
Johannes Berg 已提交
4683
	/* prepare assoc data */
4684

4685 4686
	ifmgd->beacon_crc_valid = false;

4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722
	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
4723 4724 4725 4726 4727 4728 4729
	/*
	 * 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.
	 */
4730
	for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4731 4732
		if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4733
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4734
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4735
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4736
			netdev_info(sdata->dev,
4737
				    "disabling HT/VHT due to WEP/TKIP use\n");
4738 4739
		}
	}
4740

J
Johannes Berg 已提交
4741 4742 4743
	/* 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 ||
4744 4745
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4746
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4747 4748
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4749 4750
			netdev_info(sdata->dev,
				    "disabling HT as WMM/QoS is not supported by the AP\n");
4751
	}
J
Johannes Berg 已提交
4752

4753 4754
	/* disable VHT if we don't support it or the AP doesn't use WMM */
	if (!sband->vht_cap.vht_supported ||
4755 4756
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4757
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4758 4759
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4760 4761
			netdev_info(sdata->dev,
				    "disabling VHT as WMM/QoS is not supported by the AP\n");
4762 4763
	}

B
Ben Greear 已提交
4764 4765 4766 4767
	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));

4768 4769 4770 4771
	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));

4772
	if (req->ie && req->ie_len) {
J
Johannes Berg 已提交
4773 4774 4775
		memcpy(assoc_data->ie, req->ie, req->ie_len);
		assoc_data->ie_len = req->ie_len;
	}
4776

J
Johannes Berg 已提交
4777
	assoc_data->bss = req->bss;
4778

J
Johannes Berg 已提交
4779 4780
	if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
		if (ifmgd->powersave)
4781
			sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
J
Johannes Berg 已提交
4782
		else
4783
			sdata->smps_mode = IEEE80211_SMPS_OFF;
J
Johannes Berg 已提交
4784
	} else
4785
		sdata->smps_mode = ifmgd->req_smps;
J
Johannes Berg 已提交
4786

J
Johannes Berg 已提交
4787 4788 4789
	assoc_data->capability = req->bss->capability;
	assoc_data->supp_rates = bss->supp_rates;
	assoc_data->supp_rates_len = bss->supp_rates_len;
4790

4791
	rcu_read_lock();
4792 4793 4794 4795 4796
	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
4797
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4798 4799 4800 4801 4802 4803
	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;
4804
	rcu_read_unlock();
4805

4806
	if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4807
		 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4808 4809 4810
	     "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
		sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;

K
Kalle Valo 已提交
4811
	if (bss->wmm_used && bss->uapsd_supported &&
4812
	    (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4813
		assoc_data->uapsd = true;
K
Kalle Valo 已提交
4814 4815
		ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
	} else {
4816
		assoc_data->uapsd = false;
K
Kalle Valo 已提交
4817 4818 4819
		ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
	}

4820
	if (req->prev_bssid)
J
Johannes Berg 已提交
4821
		memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4822 4823 4824 4825 4826 4827 4828 4829 4830

	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;
	}

4831 4832 4833 4834 4835
	if (req->flags & ASSOC_REQ_USE_RRM)
		ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
	else
		ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;

4836 4837 4838 4839 4840
	if (req->crypto.control_port)
		ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
	else
		ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;

4841 4842
	sdata->control_port_protocol = req->crypto.control_port_ethertype;
	sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4843 4844
	sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
							sdata->vif.type);
4845

J
Johannes Berg 已提交
4846 4847 4848
	/* kick off associate process */

	ifmgd->assoc_data = assoc_data;
4849
	ifmgd->dtim_period = 0;
4850
	ifmgd->have_beacon = false;
J
Johannes Berg 已提交
4851

4852 4853 4854 4855 4856 4857 4858 4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881
	/* override HT/VHT configuration only if the AP and we support it */
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
		struct ieee80211_sta_ht_cap sta_ht_cap;

		if (req->flags & ASSOC_REQ_DISABLE_HT)
			override = true;

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

		/* check for 40 MHz disable override */
		if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
		    sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
		    !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
			override = true;

		if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
		    req->flags & ASSOC_REQ_DISABLE_VHT)
			override = true;
	}

	if (req->flags & ASSOC_REQ_DISABLE_HT) {
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
	}

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

	err = ieee80211_prep_connection(sdata, req->bss, true, override);
4882 4883
	if (err)
		goto err_clear;
J
Johannes Berg 已提交
4884

4885 4886
	rcu_read_lock();
	beacon_ies = rcu_dereference(req->bss->beacon_ies);
4887

4888
	if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4889 4890 4891 4892 4893 4894 4895 4896
	    !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);
4897
		assoc_data->timeout_started = true;
4898 4899 4900 4901 4902
		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);
4903 4904
		u8 dtim_count = 0;

4905 4906 4907 4908
		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;
4909
			dtim_count = tim->dtim_count;
4910
		}
4911
		ifmgd->have_beacon = true;
J
Johannes Berg 已提交
4912
		assoc_data->timeout = jiffies;
4913
		assoc_data->timeout_started = true;
4914

4915
		if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4916 4917 4918 4919 4920
			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;
		}
4921 4922
	} else {
		assoc_data->timeout = jiffies;
4923
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
4924
	}
4925 4926
	rcu_read_unlock();

4927
	run_again(sdata, assoc_data->timeout);
J
Johannes Berg 已提交
4928

P
Paul Stewart 已提交
4929 4930 4931 4932 4933 4934 4935 4936 4937 4938
	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
4939 4940
		sdata_info(sdata, "associating with AP with corrupt %s\n",
			   corrupt_type);
P
Paul Stewart 已提交
4941 4942
	}

4943
	return 0;
J
Johannes Berg 已提交
4944
 err_clear:
4945
	eth_zero_addr(ifmgd->bssid);
4946
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4947 4948 4949 4950
	ifmgd->assoc_data = NULL;
 err_free:
	kfree(assoc_data);
	return err;
4951 4952
}

4953
int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4954
			 struct cfg80211_deauth_request *req)
4955
{
4956
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4957
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4958
	bool tx = !req->local_state_change;
4959

4960 4961 4962 4963 4964 4965
	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));
4966

4967
		drv_mgd_prepare_tx(sdata->local, sdata);
4968 4969
		ieee80211_send_deauth_disassoc(sdata, req->bssid,
					       IEEE80211_STYPE_DEAUTH,
4970
					       req->reason_code, tx,
4971
					       frame_buf);
4972
		ieee80211_destroy_auth_data(sdata, false);
4973 4974 4975
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    req->reason_code);
4976

4977
		return 0;
4978 4979
	}

4980 4981
	if (ifmgd->associated &&
	    ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4982 4983 4984 4985 4986
		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));

4987 4988
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       req->reason_code, tx, frame_buf);
4989 4990 4991
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    req->reason_code);
4992 4993
		return 0;
	}
4994

4995
	return -ENOTCONN;
4996
}
4997

4998
int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4999
			   struct cfg80211_disassoc_request *req)
J
Johannes Berg 已提交
5000
{
5001
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5002
	u8 bssid[ETH_ALEN];
5003
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
J
Johannes Berg 已提交
5004

J
Johannes Berg 已提交
5005 5006 5007 5008 5009 5010
	/*
	 * 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.
	 */
5011
	if (ifmgd->associated != req->bss)
5012 5013
		return -ENOLINK;

J
Johannes Berg 已提交
5014
	sdata_info(sdata,
5015 5016
		   "disassociating from %pM by local choice (Reason: %u=%s)\n",
		   req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
5017

5018
	memcpy(bssid, req->bss->bssid, ETH_ALEN);
5019 5020 5021
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
			       req->reason_code, !req->local_state_change,
			       frame_buf);
5022

5023 5024
	ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
				    req->reason_code);
5025

5026 5027
	return 0;
}
5028

5029
void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5030 5031 5032
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

5033 5034 5035 5036 5037 5038 5039 5040 5041 5042
	/*
	 * 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);
5043
	cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5044

5045
	sdata_lock(sdata);
5046 5047
	if (ifmgd->assoc_data) {
		struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5048
		ieee80211_destroy_assoc_data(sdata, false);
5049 5050
		cfg80211_assoc_timeout(sdata->dev, bss);
	}
5051 5052
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
5053 5054 5055 5056 5057 5058 5059
	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);
5060
	del_timer_sync(&ifmgd->timer);
5061
	sdata_unlock(sdata);
5062 5063
}

5064 5065 5066 5067 5068 5069
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
5070 5071
	trace_api_cqm_rssi_notify(sdata, rssi_event);

5072 5073 5074
	cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
}
EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5075 5076 5077 5078 5079 5080 5081 5082 5083 5084

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

	trace_api_cqm_beacon_loss_notify(sdata->local, sdata);

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