mlme.c 129.8 KB
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/*
 * BSS client mode implementation
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 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
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 * Copyright 2004, Instant802 Networks, Inc.
 * Copyright 2005, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
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 * Copyright 2013-2014  Intel Mobile Communications GmbH
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 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

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

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

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

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

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

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

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

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

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

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	ifmgd->probe_send_count = 0;

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

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

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

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

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

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

	chandef->width = NL80211_CHAN_WIDTH_20;

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

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

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

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

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

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

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

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

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

	*chandef = vht_chandef;

	ret = 0;

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

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

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

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		ret |= ieee80211_chandef_downgrade(chandef);
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	}

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

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

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

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

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

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

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

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

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

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

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/* frame sending functions */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u8 *pos, qos_info;
	size_t offset = 0, noffset;
596
	int i, count, rates_len, supp_rates_len, shift;
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	u16 capab;
	struct ieee80211_supported_band *sband;
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	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
601
	u32 rate_flags, rates = 0;
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602

603
	sdata_assert_lock(sdata);
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	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (WARN_ON(!chanctx_conf)) {
		rcu_read_unlock();
		return;
	}
611
	chan = chanctx_conf->def.chan;
612
	rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
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	rcu_read_unlock();
	sband = local->hw.wiphy->bands[chan->band];
615
	shift = ieee80211_vif_get_shift(&sdata->vif);
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	if (assoc_data->supp_rates_len) {
		/*
		 * Get all rates supported by the device and the AP as
		 * some APs don't like getting a superset of their rates
		 * in the association request (e.g. D-Link DAP 1353 in
		 * b-only mode)...
		 */
624 625 626 627
		rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
						     assoc_data->supp_rates,
						     assoc_data->supp_rates_len,
						     &rates);
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	} else {
		/*
		 * In case AP not provide any supported rates information
		 * before association, we send information element(s) with
		 * all rates that we support.
		 */
634 635 636 637 638 639 640 641
		rates_len = 0;
		for (i = 0; i < sband->n_bitrates; i++) {
			if ((rate_flags & sband->bitrates[i].flags)
			    != rate_flags)
				continue;
			rates |= BIT(i);
			rates_len++;
		}
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	}

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

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

	capab = WLAN_CAPABILITY_ESS;

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

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

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

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

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

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

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

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

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

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

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

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

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

	/* if present, add any custom IEs that go before HT */
767
	if (assoc_data->ie_len) {
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		static const u8 before_ht[] = {
			WLAN_EID_SSID,
			WLAN_EID_SUPP_RATES,
			WLAN_EID_EXT_SUPP_RATES,
			WLAN_EID_PWR_CAPABILITY,
			WLAN_EID_SUPPORTED_CHANNELS,
			WLAN_EID_RSN,
			WLAN_EID_QOS_CAPA,
			WLAN_EID_RRM_ENABLED_CAPABILITIES,
			WLAN_EID_MOBILITY_DOMAIN,
			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
		};
		noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
					     before_ht, ARRAY_SIZE(before_ht),
					     offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
		offset = noffset;
	}

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

792
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
793
		ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
794
				    sband, chan, sdata->smps_mode);
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796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823
	/* 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,
		};
		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;
	}

824
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
825 826
		ieee80211_add_vht_ie(sdata, skb, sband,
				     &assoc_data->ap_vht_cap);
827

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	/* if present, add any custom non-vendor IEs that go after HT */
829
	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;
	}

838 839
	if (assoc_data->wmm) {
		if (assoc_data->uapsd) {
840 841
			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;
		}

847
		pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
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	}

	/* add any remaining custom (i.e. vendor specific here) IEs */
851
	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;
860 861 862
	if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
						IEEE80211_TX_INTFL_MLME_CONN_TX;
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	ieee80211_tx_skb(sdata, skb);
}

866 867 868 869 870 871
void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_pspoll *pspoll;
	struct sk_buff *skb;

872 873
	skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
	if (!skb)
874 875
		return;

876 877
	pspoll = (struct ieee80211_pspoll *) skb->data;
	pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
878

879 880
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
881 882
}

883 884 885 886 887
void ieee80211_send_nullfunc(struct ieee80211_local *local,
			     struct ieee80211_sub_if_data *sdata,
			     int powersave)
{
	struct sk_buff *skb;
888
	struct ieee80211_hdr_3addr *nullfunc;
889
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
890

891 892
	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
	if (!skb)
893 894
		return;

895
	nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
896
	if (powersave)
897
		nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
898

899 900
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
					IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
901 902 903 904

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

905
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
906 907
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;

908
	ieee80211_tx_skb(sdata, skb);
909 910
}

911 912 913 914 915 916 917 918 919 920 921
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);
922
	if (!skb)
923
		return;
924

925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940
	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);
}

941 942 943 944 945
/* 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);
946
	struct ieee80211_local *local = sdata->local;
947
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
948
	int ret;
949

950
	if (!ieee80211_sdata_running(sdata))
951 952
		return;

953
	sdata_lock(sdata);
954 955 956
	mutex_lock(&local->mtx);
	mutex_lock(&local->chanctx_mtx);

957 958
	if (!ifmgd->associated)
		goto out;
959

960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993
	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)) {
994
		sdata_info(sdata,
995
			   "failed to finalize channel switch, disconnecting\n");
996 997 998 999
		ieee80211_queue_work(&sdata->local->hw,
				     &ifmgd->csa_connection_drop_work);
		goto out;
	}
1000

1001
	/* XXX: shouldn't really modify cfg80211-owned data! */
1002
	ifmgd->associated->channel = sdata->csa_chandef.chan;
1003

1004
	sdata->vif.csa_active = false;
1005

1006
	/* XXX: wait for a beacon first? */
1007 1008 1009 1010 1011
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
1012

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	ieee80211_sta_reset_beacon_monitor(sdata);
	ieee80211_sta_reset_conn_monitor(sdata);

1016
out:
1017 1018
	mutex_unlock(&local->chanctx_mtx);
	mutex_unlock(&local->mtx);
1019
	sdata_unlock(sdata);
1020 1021
}

1022 1023
void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
{
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	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1026 1027 1028

	trace_api_chswitch_done(sdata, success);
	if (!success) {
1029 1030 1031 1032 1033 1034
		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);
1035 1036 1037 1038
	}
}
EXPORT_SYMBOL(ieee80211_chswitch_done);

1039 1040 1041 1042
static void ieee80211_chswitch_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
1043

1044
	ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1045 1046
}

1047
static void
J
Johannes Berg 已提交
1048
ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1049 1050
				 u64 timestamp, struct ieee802_11_elems *elems,
				 bool beacon)
1051
{
1052
	struct ieee80211_local *local = sdata->local;
1053
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1054
	struct cfg80211_bss *cbss = ifmgd->associated;
1055
	struct ieee80211_chanctx_conf *conf;
J
Johannes Berg 已提交
1056
	struct ieee80211_chanctx *chanctx;
1057
	enum ieee80211_band current_band;
1058
	struct ieee80211_csa_ie csa_ie;
1059
	int res;
1060

1061
	sdata_assert_lock(sdata);
1062

1063
	if (!cbss)
1064 1065
		return;

1066
	if (local->scanning)
1067 1068
		return;

1069
	/* disregard subsequent announcements if we are already processing */
1070
	if (sdata->vif.csa_active)
1071 1072
		return;

1073
	current_band = cbss->channel->band;
1074
	memset(&csa_ie, 0, sizeof(csa_ie));
1075 1076
	res = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, current_band,
					   ifmgd->flags,
1077
					   ifmgd->associated->bssid, &csa_ie);
1078
	if (res	< 0)
1079
		ieee80211_queue_work(&local->hw,
1080
				     &ifmgd->csa_connection_drop_work);
1081
	if (res)
1082
		return;
1083

1084
	if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1085 1086 1087
				     IEEE80211_CHAN_DISABLED)) {
		sdata_info(sdata,
			   "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1088
			   ifmgd->associated->bssid,
1089 1090 1091
			   csa_ie.chandef.chan->center_freq,
			   csa_ie.chandef.width, csa_ie.chandef.center_freq1,
			   csa_ie.chandef.center_freq2);
1092 1093 1094 1095 1096
		ieee80211_queue_work(&local->hw,
				     &ifmgd->csa_connection_drop_work);
		return;
	}

1097
	mutex_lock(&local->mtx);
1098
	mutex_lock(&local->chanctx_mtx);
1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
					 lockdep_is_held(&local->chanctx_mtx));
	if (!conf) {
		sdata_info(sdata,
			   "no channel context assigned to vif?, disconnecting\n");
		ieee80211_queue_work(&local->hw,
				     &ifmgd->csa_connection_drop_work);
		mutex_unlock(&local->chanctx_mtx);
		mutex_unlock(&local->mtx);
		return;
	}

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

1113
	if (local->use_chanctx) {
1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124
		u32 num_chanctx = 0;
		list_for_each_entry(chanctx, &local->chanctx_list, list)
		       num_chanctx++;

		if (num_chanctx > 1 ||
		    !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
			sdata_info(sdata,
				   "not handling chan-switch with channel contexts\n");
			ieee80211_queue_work(&local->hw,
					     &ifmgd->csa_connection_drop_work);
			mutex_unlock(&local->chanctx_mtx);
1125
			mutex_unlock(&local->mtx);
1126 1127
			return;
		}
J
Johannes Berg 已提交
1128 1129
	}

1130 1131 1132
	res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
					    chanctx->mode, false);
	if (res) {
J
Johannes Berg 已提交
1133
		sdata_info(sdata,
1134 1135
			   "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
			   res);
1136
		ieee80211_queue_work(&local->hw,
J
Johannes Berg 已提交
1137
				     &ifmgd->csa_connection_drop_work);
1138
		mutex_unlock(&local->chanctx_mtx);
1139
		mutex_unlock(&local->mtx);
J
Johannes Berg 已提交
1140 1141
		return;
	}
1142
	mutex_unlock(&local->chanctx_mtx);
J
Johannes Berg 已提交
1143

1144
	sdata->vif.csa_active = true;
1145
	sdata->csa_chandef = csa_ie.chandef;
1146
	sdata->csa_block_tx = csa_ie.mode;
J
Johannes Berg 已提交
1147

1148
	if (sdata->csa_block_tx)
1149 1150
		ieee80211_stop_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
1151
	mutex_unlock(&local->mtx);
1152

1153
	if (local->ops->channel_switch) {
1154
		/* use driver's channel switch callback */
1155 1156
		struct ieee80211_channel_switch ch_switch = {
			.timestamp = timestamp,
1157 1158 1159
			.block_tx = csa_ie.mode,
			.chandef = csa_ie.chandef,
			.count = csa_ie.count,
1160 1161
		};

1162
		drv_channel_switch(local, &ch_switch);
1163 1164 1165 1166
		return;
	}

	/* channel switch handled in software */
1167
	if (csa_ie.count <= 1)
1168
		ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1169
	else
1170
		mod_timer(&ifmgd->chswitch_timer,
1171
			  TU_TO_EXP_TIME(csa_ie.count * cbss->beacon_interval));
1172 1173
}

1174 1175 1176 1177
static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_channel *channel,
				       const u8 *country_ie, u8 country_ie_len,
				       const u8 *pwr_constr_elem)
1178
{
1179 1180 1181 1182
	struct ieee80211_country_ie_triplet *triplet;
	int chan = ieee80211_frequency_to_channel(channel->center_freq);
	int i, chan_pwr, chan_increment, new_ap_level;
	bool have_chan_pwr = false;
1183

1184 1185
	/* Invalid IE */
	if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1186
		return 0;
1187

1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201
	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;
1202
	}
1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226

	/* find channel */
	while (country_ie_len >= 3) {
		u8 first_channel = triplet->chans.first_channel;

		if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
			goto next;

		for (i = 0; i < triplet->chans.num_channels; i++) {
			if (first_channel + i * chan_increment == chan) {
				have_chan_pwr = true;
				chan_pwr = triplet->chans.max_power;
				break;
			}
		}
		if (have_chan_pwr)
			break;

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

	if (!have_chan_pwr)
1227
		return 0;
1228 1229 1230

	new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);

1231 1232
	if (sdata->ap_power_level == new_ap_level)
		return 0;
1233 1234 1235 1236 1237

	sdata_info(sdata,
		   "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
		   new_ap_level, chan_pwr, *pwr_constr_elem,
		   sdata->u.mgd.bssid);
1238 1239 1240 1241
	sdata->ap_power_level = new_ap_level;
	if (__ieee80211_recalc_txpower(sdata))
		return BSS_CHANGED_TXPOWER;
	return 0;
1242 1243
}

1244 1245 1246 1247 1248 1249
/* 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
1250 1251 1252 1253
	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
1254
	if (local->scanning)
J
Johannes Berg 已提交
1255 1256
		return;

1257 1258 1259 1260 1261 1262 1263
	if (conf->dynamic_ps_timeout > 0 &&
	    !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
		mod_timer(&local->dynamic_ps_timer, jiffies +
			  msecs_to_jiffies(conf->dynamic_ps_timeout));
	} else {
		if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
			ieee80211_send_nullfunc(local, sdata, 1);
1264

1265 1266 1267 1268 1269 1270
		if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
		    (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
			return;

		conf->flags |= IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287
	}
}

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);
	}
}

1288 1289 1290 1291
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
1292
	bool authorized = false;
1293 1294 1295 1296

	if (!mgd->powersave)
		return false;

1297 1298 1299
	if (mgd->broken_ap)
		return false;

1300 1301 1302
	if (!mgd->associated)
		return false;

1303
	if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1304 1305
		return false;

1306
	if (!mgd->have_beacon)
1307 1308
		return false;

1309 1310 1311
	rcu_read_lock();
	sta = sta_info_get(sdata, mgd->bssid);
	if (sta)
J
Johannes Berg 已提交
1312
		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1313 1314
	rcu_read_unlock();

J
Johannes Berg 已提交
1315
	return authorized;
1316 1317
}

1318
/* need to hold RTNL or interface lock */
1319
void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1320 1321 1322
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;
1323
	int timeout;
1324 1325 1326 1327 1328 1329 1330

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

	list_for_each_entry(sdata, &local->interfaces, list) {
1331
		if (!ieee80211_sdata_running(sdata))
1332
			continue;
1333 1334 1335 1336 1337 1338 1339 1340
		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;
		}
1341 1342 1343 1344 1345 1346
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

1347
	if (count == 1 && ieee80211_powersave_allowed(found)) {
1348 1349 1350
		s32 beaconint_us;

		if (latency < 0)
M
Mark Gross 已提交
1351
			latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1352 1353 1354 1355

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

1356
		timeout = local->dynamic_ps_forced_timeout;
1357 1358
		if (timeout < 0) {
			/*
1359 1360
			 * Go to full PSM if the user configures a very low
			 * latency requirement.
1361 1362 1363
			 * The 2000 second value is there for compatibility
			 * until the PM_QOS_NETWORK_LATENCY is configured
			 * with real values.
1364
			 */
1365 1366
			if (latency > (1900 * USEC_PER_MSEC) &&
			    latency != (2000 * USEC_PER_SEC))
1367
				timeout = 0;
1368 1369
			else
				timeout = 100;
1370
		}
1371
		local->hw.conf.dynamic_ps_timeout = timeout;
1372

1373
		if (beaconint_us > latency) {
1374
			local->ps_sdata = NULL;
1375 1376
		} else {
			int maxslp = 1;
1377
			u8 dtimper = found->u.mgd.dtim_period;
1378 1379 1380 1381 1382

			/* If the TIM IE is invalid, pretend the value is 1 */
			if (!dtimper)
				dtimper = 1;
			else if (dtimper > 1)
1383 1384 1385
				maxslp = min_t(int, dtimper,
						    latency / beaconint_us);

1386
			local->hw.conf.max_sleep_period = maxslp;
1387
			local->hw.conf.ps_dtim_period = dtimper;
1388
			local->ps_sdata = found;
1389
		}
1390
	} else {
1391
		local->ps_sdata = NULL;
1392
	}
1393 1394 1395 1396

	ieee80211_change_ps(local);
}

E
Eliad Peller 已提交
1397 1398 1399 1400 1401 1402 1403 1404 1405 1406
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);
	}
}

1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418
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,
1419
					IEEE80211_MAX_QUEUE_MAP,
1420 1421
					IEEE80211_QUEUE_STOP_REASON_PS,
					false);
1422 1423 1424 1425 1426 1427 1428 1429
}

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;
1430
	struct ieee80211_if_managed *ifmgd;
1431 1432
	unsigned long flags;
	int q;
1433 1434 1435 1436 1437

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

1438 1439
	ifmgd = &sdata->u.mgd;

1440 1441 1442
	if (local->hw.conf.flags & IEEE80211_CONF_PS)
		return;

1443
	if (local->hw.conf.dynamic_ps_timeout > 0) {
1444 1445
		/* don't enter PS if TX frames are pending */
		if (drv_tx_frames_pending(local)) {
1446 1447 1448 1449 1450
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
			return;
		}
1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468

		/*
		 * 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);
1469 1470
	}

1471
	if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1472
	    !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1473
		if (drv_tx_frames_pending(local)) {
1474 1475 1476
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
1477
		} else {
1478 1479
			ieee80211_send_nullfunc(local, sdata, 1);
			/* Flush to get the tx status of nullfunc frame */
1480
			ieee80211_flush_queues(local, sdata);
1481
		}
1482 1483
	}

1484 1485
	if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
	      (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1486 1487 1488 1489 1490
	    (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);
	}
1491 1492 1493 1494 1495 1496
}

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

1497
	if (local->quiescing || local->suspended)
1498 1499
		return;

1500
	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1501 1502
}

1503 1504 1505 1506 1507 1508 1509
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);
1510
	struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1511

1512 1513 1514 1515 1516 1517 1518 1519
	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);
1520 1521
}

J
Johannes Berg 已提交
1522
/* MLME */
1523
static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1524
				     struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
1525
				     const u8 *wmm_param, size_t wmm_param_len)
1526 1527
{
	struct ieee80211_tx_queue_params params;
1528
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1529 1530
	size_t left;
	int count;
J
Johannes Berg 已提交
1531 1532
	const u8 *pos;
	u8 uapsd_queues = 0;
1533

1534
	if (!local->ops->conf_tx)
1535
		return false;
1536

J
Johannes Berg 已提交
1537
	if (local->hw.queues < IEEE80211_NUM_ACS)
1538
		return false;
1539 1540

	if (!wmm_param)
1541
		return false;
1542

1543
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1544
		return false;
K
Kalle Valo 已提交
1545 1546

	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1547
		uapsd_queues = ifmgd->uapsd_queues;
K
Kalle Valo 已提交
1548

1549
	count = wmm_param[6] & 0x0f;
1550
	if (count == ifmgd->wmm_last_param_set)
1551
		return false;
1552
	ifmgd->wmm_last_param_set = count;
1553 1554 1555 1556 1557 1558

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

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

Y
Yoni Divinsky 已提交
1559
	sdata->wmm_acm = 0;
1560 1561 1562
	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
1563
		bool uapsd = false;
1564 1565 1566
		int queue;

		switch (aci) {
1567
		case 1: /* AC_BK */
J
Johannes Berg 已提交
1568
			queue = 3;
J
Johannes Berg 已提交
1569
			if (acm)
Y
Yoni Divinsky 已提交
1570
				sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
K
Kalle Valo 已提交
1571 1572
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
				uapsd = true;
1573
			break;
1574
		case 2: /* AC_VI */
J
Johannes Berg 已提交
1575
			queue = 1;
J
Johannes Berg 已提交
1576
			if (acm)
Y
Yoni Divinsky 已提交
1577
				sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
K
Kalle Valo 已提交
1578 1579
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
				uapsd = true;
1580
			break;
1581
		case 3: /* AC_VO */
J
Johannes Berg 已提交
1582
			queue = 0;
J
Johannes Berg 已提交
1583
			if (acm)
Y
Yoni Divinsky 已提交
1584
				sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
K
Kalle Valo 已提交
1585 1586
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
				uapsd = true;
1587
			break;
1588
		case 0: /* AC_BE */
1589
		default:
J
Johannes Berg 已提交
1590
			queue = 2;
J
Johannes Berg 已提交
1591
			if (acm)
Y
Yoni Divinsky 已提交
1592
				sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
K
Kalle Valo 已提交
1593 1594
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
				uapsd = true;
1595 1596 1597 1598 1599 1600
			break;
		}

		params.aifs = pos[0] & 0x0f;
		params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params.cw_min = ecw2cw(pos[1] & 0x0f);
1601
		params.txop = get_unaligned_le16(pos + 2);
1602
		params.acm = acm;
K
Kalle Valo 已提交
1603 1604
		params.uapsd = uapsd;

J
Johannes Berg 已提交
1605 1606 1607 1608 1609
		mlme_dbg(sdata,
			 "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
			 queue, aci, acm,
			 params.aifs, params.cw_min, params.cw_max,
			 params.txop, params.uapsd);
1610 1611
		sdata->tx_conf[queue] = params;
		if (drv_conf_tx(local, sdata, queue, &params))
J
Johannes Berg 已提交
1612 1613 1614
			sdata_err(sdata,
				  "failed to set TX queue parameters for queue %d\n",
				  queue);
1615
	}
1616 1617

	/* enable WMM or activate new settings */
1618
	sdata->vif.bss_conf.qos = true;
1619
	return true;
1620 1621
}

1622 1623 1624 1625
static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
{
	lockdep_assert_held(&sdata->local->mtx);

1626
	sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1627 1628 1629 1630 1631 1632 1633 1634 1635 1636
	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
1637 1638
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
1639
{
J
Johannes Berg 已提交
1640
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1641
	u32 changed = 0;
J
Johannes Berg 已提交
1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654
	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
1655
	if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1656
		use_short_slot = true;
1657

1658 1659 1660
	if (use_protection != bss_conf->use_cts_prot) {
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
1661
	}
1662

1663 1664
	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
1665
		changed |= BSS_CHANGED_ERP_PREAMBLE;
1666
	}
1667

J
Johannes Berg 已提交
1668 1669 1670
	if (use_short_slot != bss_conf->use_short_slot) {
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
1671 1672 1673 1674 1675
	}

	return changed;
}

1676
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1677
				     struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
1678
				     u32 bss_info_changed)
1679
{
1680
	struct ieee80211_bss *bss = (void *)cbss->priv;
1681
	struct ieee80211_local *local = sdata->local;
1682
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1683

J
Johannes Berg 已提交
1684
	bss_info_changed |= BSS_CHANGED_ASSOC;
1685
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1686
		bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1687

1688
	sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1689
		beacon_loss_count * bss_conf->beacon_int));
1690

1691 1692
	sdata->u.mgd.associated = cbss;
	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1693

1694 1695
	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;

1696
	if (sdata->vif.p2p) {
1697
		const struct cfg80211_bss_ies *ies;
1698

1699 1700 1701 1702 1703 1704 1705 1706
		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
1707 1708
					(u8 *) &bss_conf->p2p_noa_attr,
					sizeof(bss_conf->p2p_noa_attr));
1709
			if (ret >= 2) {
J
Janusz Dziedzic 已提交
1710 1711
				sdata->u.mgd.p2p_noa_index =
					bss_conf->p2p_noa_attr.index;
1712 1713
				bss_info_changed |= BSS_CHANGED_P2P_PS;
			}
1714
		}
1715
		rcu_read_unlock();
1716 1717
	}

J
Johannes Berg 已提交
1718
	/* just to be sure */
1719
	ieee80211_stop_poll(sdata);
J
Johannes Berg 已提交
1720

1721
	ieee80211_led_assoc(local, 1);
1722

1723
	if (sdata->u.mgd.have_beacon) {
1724 1725 1726 1727 1728 1729 1730
		/*
		 * 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;
1731
		bss_conf->beacon_rate = bss->beacon_rate;
1732
		bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1733
	} else {
1734
		bss_conf->beacon_rate = NULL;
1735
		bss_conf->dtim_period = 0;
1736
	}
1737

1738
	bss_conf->assoc = 1;
1739

1740
	/* Tell the driver to monitor connection quality (if supported) */
1741
	if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1742
	    bss_conf->cqm_rssi_thold)
1743 1744
		bss_info_changed |= BSS_CHANGED_CQM;

1745
	/* Enable ARP filtering */
1746
	if (bss_conf->arp_addr_cnt)
1747 1748
		bss_info_changed |= BSS_CHANGED_ARP_FILTER;

J
Johannes Berg 已提交
1749
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1750

J
Johannes Berg 已提交
1751 1752 1753
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
	mutex_unlock(&local->iflist_mtx);
1754

1755
	ieee80211_recalc_smps(sdata);
E
Eliad Peller 已提交
1756 1757
	ieee80211_recalc_ps_vif(sdata);

1758
	netif_carrier_on(sdata->dev);
1759 1760
}

1761
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1762 1763
				   u16 stype, u16 reason, bool tx,
				   u8 *frame_buf)
1764
{
1765
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1766
	struct ieee80211_local *local = sdata->local;
1767
	u32 changed = 0;
1768

1769
	sdata_assert_lock(sdata);
1770

1771 1772 1773
	if (WARN_ON_ONCE(tx && !frame_buf))
		return;

J
Johannes Berg 已提交
1774 1775 1776
	if (WARN_ON(!ifmgd->associated))
		return;

1777 1778
	ieee80211_stop_poll(sdata);

1779
	ifmgd->associated = NULL;
1780 1781
	netif_carrier_off(sdata->dev);

1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792
	/*
	 * 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
1793 1794 1795
	/* disable per-vif ps */
	ieee80211_recalc_ps_vif(sdata);

1796 1797
	/* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
	if (tx)
1798
		ieee80211_flush_queues(local, sdata);
1799

1800 1801
	/* deauthenticate/disassociate now */
	if (tx || frame_buf)
1802 1803
		ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
					       reason, tx, frame_buf);
1804 1805 1806

	/* flush out frame */
	if (tx)
1807
		ieee80211_flush_queues(local, sdata);
1808

1809 1810 1811
	/* clear bssid only after building the needed mgmt frames */
	memset(ifmgd->bssid, 0, ETH_ALEN);

1812
	/* remove AP and TDLS peers */
1813
	sta_info_flush(sdata);
1814 1815

	/* finally reset all BSS / config parameters */
1816 1817 1818
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
J
Johannes Berg 已提交
1819 1820
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
1821

J
Janusz Dziedzic 已提交
1822 1823 1824
	ifmgd->p2p_noa_index = -1;
	memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
	       sizeof(sdata->vif.bss_conf.p2p_noa_attr));
1825

1826
	/* on the next assoc, re-program HT/VHT parameters */
B
Ben Greear 已提交
1827 1828
	memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
	memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1829 1830
	memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
	memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
1831

1832
	sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1833

1834 1835 1836
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

1837
	/* Disable ARP filtering */
1838
	if (sdata->vif.bss_conf.arp_addr_cnt)
1839 1840
		changed |= BSS_CHANGED_ARP_FILTER;

1841 1842 1843
	sdata->vif.bss_conf.qos = false;
	changed |= BSS_CHANGED_QOS;

1844 1845
	/* The BSSID (not really interesting) and HT changed */
	changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
J
Johannes Berg 已提交
1846
	ieee80211_bss_info_change_notify(sdata, changed);
1847

1848 1849 1850
	/* disassociated - set to defaults now */
	ieee80211_set_wmm_default(sdata, false);

1851 1852 1853 1854
	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);
1855

1856
	sdata->vif.bss_conf.dtim_period = 0;
1857 1858
	sdata->vif.bss_conf.beacon_rate = NULL;

1859
	ifmgd->have_beacon = false;
1860

1861
	ifmgd->flags = 0;
1862
	mutex_lock(&local->mtx);
1863
	ieee80211_vif_release_channel(sdata);
1864 1865

	sdata->vif.csa_active = false;
1866 1867 1868 1869 1870
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
1871
	mutex_unlock(&local->mtx);
1872 1873

	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1874
}
1875

1876 1877 1878 1879 1880 1881 1882 1883
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
1884 1885
	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
1886
	 */
J
Johannes Berg 已提交
1887 1888 1889
	if (is_multicast_ether_addr(hdr->addr1))
		return;

1890
	ieee80211_sta_reset_conn_monitor(sdata);
1891
}
1892

1893 1894 1895
static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1896
	struct ieee80211_local *local = sdata->local;
1897

1898
	mutex_lock(&local->mtx);
1899 1900
	if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
		goto out;
1901

1902
	__ieee80211_stop_poll(sdata);
1903 1904 1905 1906

	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
	mutex_unlock(&local->iflist_mtx);
1907 1908

	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1909
		goto out;
1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920

	/*
	 * 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));
1921 1922
out:
	mutex_unlock(&local->mtx);
1923 1924 1925
}

void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1926
			     struct ieee80211_hdr *hdr, bool ack)
1927
{
F
Felix Fietkau 已提交
1928
	if (!ieee80211_is_data(hdr->frame_control))
1929 1930 1931 1932
	    return;

	if (ieee80211_is_nullfunc(hdr->frame_control) &&
	    sdata->u.mgd.probe_send_count > 0) {
1933
		if (ack)
1934
			ieee80211_sta_reset_conn_monitor(sdata);
1935 1936
		else
			sdata->u.mgd.nullfunc_failed = true;
1937
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1938
		return;
1939
	}
1940 1941 1942

	if (ack)
		ieee80211_sta_reset_conn_monitor(sdata);
1943 1944
}

1945 1946 1947 1948
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ssid;
1949
	u8 *dst = ifmgd->associated->bssid;
1950
	u8 unicast_limit = max(1, max_probe_tries - 3);
1951 1952 1953 1954 1955 1956 1957 1958

	/*
	 * 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;
1959

1960 1961 1962 1963 1964 1965 1966
	/*
	 * 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.
	 */
1967 1968
	ifmgd->probe_send_count++;

1969 1970
	if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
		ifmgd->nullfunc_failed = false;
1971
		ieee80211_send_nullfunc(sdata->local, sdata, 0);
1972
	} else {
1973 1974
		int ssid_len;

1975
		rcu_read_lock();
1976
		ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1977 1978 1979 1980 1981 1982
		if (WARN_ON_ONCE(ssid == NULL))
			ssid_len = 0;
		else
			ssid_len = ssid[1];

		ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1983
					 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
1984
					 ifmgd->associated->channel, false);
1985
		rcu_read_unlock();
1986
	}
1987

1988
	ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1989
	run_again(sdata, ifmgd->probe_timeout);
1990
	if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1991
		ieee80211_flush_queues(sdata->local, sdata);
1992 1993
}

J
Johannes Berg 已提交
1994 1995
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
				   bool beacon)
1996 1997
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
1998
	bool already = false;
1999

2000
	if (!ieee80211_sdata_running(sdata))
2001 2002
		return;

2003
	sdata_lock(sdata);
2004 2005 2006 2007

	if (!ifmgd->associated)
		goto out;

2008 2009 2010 2011 2012 2013 2014
	mutex_lock(&sdata->local->mtx);

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

2015
	if (beacon) {
J
Johannes Berg 已提交
2016
		mlme_dbg_ratelimited(sdata,
2017 2018
				     "detected beacon loss from AP (missed %d beacons) - probing\n",
				     beacon_loss_count);
J
Johannes Berg 已提交
2019

2020 2021 2022 2023
		ieee80211_cqm_rssi_notify(&sdata->vif,
					  NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
					  GFP_KERNEL);
	}
2024

J
Johannes Berg 已提交
2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035
	/*
	 * 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!
	 */
2036
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
J
Johannes Berg 已提交
2037 2038
		already = true;

E
Eliad Peller 已提交
2039 2040
	ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;

2041 2042
	mutex_unlock(&sdata->local->mtx);

J
Johannes Berg 已提交
2043 2044 2045
	if (already)
		goto out;

2046 2047 2048 2049
	mutex_lock(&sdata->local->iflist_mtx);
	ieee80211_recalc_ps(sdata->local, -1);
	mutex_unlock(&sdata->local->iflist_mtx);

2050 2051
	ifmgd->probe_send_count = 0;
	ieee80211_mgd_probe_ap_send(sdata);
2052
 out:
2053
	sdata_unlock(sdata);
2054 2055
}

2056 2057 2058 2059 2060
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;
2061
	struct cfg80211_bss *cbss;
2062 2063
	struct sk_buff *skb;
	const u8 *ssid;
2064
	int ssid_len;
2065 2066 2067 2068

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

2069
	sdata_assert_lock(sdata);
2070

2071 2072 2073 2074 2075 2076 2077
	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
2078 2079
		return NULL;

2080
	rcu_read_lock();
2081
	ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2082 2083 2084 2085 2086
	if (WARN_ON_ONCE(ssid == NULL))
		ssid_len = 0;
	else
		ssid_len = ssid[1];

2087
	skb = ieee80211_build_probe_req(sdata, cbss->bssid,
J
Johannes Berg 已提交
2088
					(u32) -1, cbss->channel,
2089
					ssid + 2, ssid_len,
2090
					NULL, 0, true);
2091
	rcu_read_unlock();
2092 2093 2094 2095 2096

	return skb;
}
EXPORT_SYMBOL(ieee80211_ap_probereq_get);

2097
static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2098
{
2099
	struct ieee80211_local *local = sdata->local;
2100
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2101
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2102

2103
	sdata_lock(sdata);
2104
	if (!ifmgd->associated) {
2105
		sdata_unlock(sdata);
2106 2107 2108
		return;
	}

2109 2110
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
			       WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2111
			       true, frame_buf);
2112
	mutex_lock(&local->mtx);
2113
	sdata->vif.csa_active = false;
2114 2115 2116 2117 2118
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
2119
	mutex_unlock(&local->mtx);
2120

2121 2122
	cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
			      IEEE80211_DEAUTH_FRAME_LEN);
2123
	sdata_unlock(sdata);
2124 2125
}

2126
static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
J
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2127 2128 2129
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
2130
			     u.mgd.beacon_connection_loss_work);
2131 2132 2133 2134
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct sta_info *sta;

	if (ifmgd->associated) {
2135
		rcu_read_lock();
2136 2137 2138
		sta = sta_info_get(sdata, ifmgd->bssid);
		if (sta)
			sta->beacon_loss_count++;
2139
		rcu_read_unlock();
2140
	}
J
Johannes Berg 已提交
2141

2142
	if (ifmgd->connection_loss) {
2143 2144
		sdata_info(sdata, "Connection to AP %pM lost\n",
			   ifmgd->bssid);
2145
		__ieee80211_disconnect(sdata);
2146
	} else {
2147
		ieee80211_mgd_probe_ap(sdata, true);
2148 2149 2150 2151 2152 2153 2154 2155 2156
	}
}

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);

2157
	__ieee80211_disconnect(sdata);
J
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2158 2159
}

2160 2161 2162
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2163
	struct ieee80211_hw *hw = &sdata->local->hw;
2164

J
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2165 2166
	trace_api_beacon_loss(sdata);

2167
	sdata->u.mgd.connection_loss = false;
2168
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2169 2170 2171
}
EXPORT_SYMBOL(ieee80211_beacon_loss);

2172 2173 2174 2175 2176
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
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2177 2178
	trace_api_connection_loss(sdata);

2179
	sdata->u.mgd.connection_loss = true;
2180 2181 2182 2183 2184
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_connection_loss);


J
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2185 2186 2187 2188 2189
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;

2190
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2191 2192 2193 2194 2195 2196

	if (!assoc) {
		sta_info_destroy_addr(sdata, auth_data->bss->bssid);

		memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2197
		sdata->u.mgd.flags = 0;
2198
		mutex_lock(&sdata->local->mtx);
J
Johannes Berg 已提交
2199
		ieee80211_vif_release_channel(sdata);
2200
		mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
2201 2202
	}

2203
	cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
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2204 2205 2206 2207 2208 2209 2210
	kfree(auth_data);
	sdata->u.mgd.auth_data = NULL;
}

static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
{
2211
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
2212 2213 2214
	struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
	u8 *pos;
	struct ieee802_11_elems elems;
2215
	u32 tx_flags = 0;
J
Johannes Berg 已提交
2216 2217

	pos = mgmt->u.auth.variable;
2218
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2219 2220 2221
	if (!elems.challenge)
		return;
	auth_data->expected_transaction = 4;
J
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2222
	drv_mgd_prepare_tx(sdata->local, sdata);
2223 2224 2225
	if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
		tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
			   IEEE80211_TX_INTFL_MLME_CONN_TX;
2226
	ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
J
Johannes Berg 已提交
2227 2228 2229
			    elems.challenge - 2, elems.challenge_len + 2,
			    auth_data->bss->bssid, auth_data->bss->bssid,
			    auth_data->key, auth_data->key_len,
2230
			    auth_data->key_idx, tx_flags);
J
Johannes Berg 已提交
2231 2232
}

2233 2234
static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_mgmt *mgmt, size_t len)
J
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2235 2236 2237 2238 2239 2240
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u8 bssid[ETH_ALEN];
	u16 auth_alg, auth_transaction, status_code;
	struct sta_info *sta;

2241
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2242 2243

	if (len < 24 + 6)
2244
		return;
J
Johannes Berg 已提交
2245 2246

	if (!ifmgd->auth_data || ifmgd->auth_data->done)
2247
		return;
J
Johannes Berg 已提交
2248 2249 2250

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

2251
	if (!ether_addr_equal(bssid, mgmt->bssid))
2252
		return;
J
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2253 2254 2255 2256 2257 2258

	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 ||
2259 2260 2261 2262 2263
	    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);
2264
		return;
2265
	}
J
Johannes Berg 已提交
2266 2267

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
2268 2269
		sdata_info(sdata, "%pM denied authentication (status %d)\n",
			   mgmt->sa, status_code);
2270
		ieee80211_destroy_auth_data(sdata, false);
2271
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2272
		return;
J
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2273 2274 2275 2276 2277 2278
	}

	switch (ifmgd->auth_data->algorithm) {
	case WLAN_AUTH_OPEN:
	case WLAN_AUTH_LEAP:
	case WLAN_AUTH_FT:
2279
	case WLAN_AUTH_SAE:
J
Johannes Berg 已提交
2280 2281 2282 2283 2284
		break;
	case WLAN_AUTH_SHARED_KEY:
		if (ifmgd->auth_data->expected_transaction != 4) {
			ieee80211_auth_challenge(sdata, mgmt, len);
			/* need another frame */
2285
			return;
J
Johannes Berg 已提交
2286 2287 2288 2289 2290
		}
		break;
	default:
		WARN_ONCE(1, "invalid auth alg %d",
			  ifmgd->auth_data->algorithm);
2291
		return;
J
Johannes Berg 已提交
2292 2293
	}

J
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2294
	sdata_info(sdata, "authenticated\n");
J
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2295 2296
	ifmgd->auth_data->done = true;
	ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2297
	ifmgd->auth_data->timeout_started = true;
2298
	run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
2299

2300 2301 2302 2303 2304 2305
	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.
		 */
2306
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2307
		return;
2308 2309
	}

J
Johannes Berg 已提交
2310 2311 2312 2313 2314 2315 2316 2317
	/* 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
2318
		sdata_info(sdata, "failed moving %pM to auth\n", bssid);
J
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2319 2320 2321 2322
		goto out_err;
	}
	mutex_unlock(&sdata->local->sta_mtx);

2323
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2324
	return;
J
Johannes Berg 已提交
2325 2326 2327 2328 2329
 out_err:
	mutex_unlock(&sdata->local->sta_mtx);
	/* ignore frame -- wait for timeout */
}

2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385
#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>";
	}
}
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2386

2387 2388
static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
2389
{
2390
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2391
	const u8 *bssid = NULL;
2392 2393
	u16 reason_code;

2394
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2395

2396
	if (len < 24 + 2)
2397
		return;
2398

J
Johannes Berg 已提交
2399
	if (!ifmgd->associated ||
2400
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2401
		return;
2402

2403
	bssid = ifmgd->associated->bssid;
2404 2405 2406

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

2407 2408
	sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
		   bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
2409

2410 2411
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2412
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2413 2414 2415
}


2416 2417
static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_mgmt *mgmt, size_t len)
2418
{
2419
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2420 2421
	u16 reason_code;

2422
	sdata_assert_lock(sdata);
2423

J
Johannes Berg 已提交
2424
	if (len < 24 + 2)
2425
		return;
2426

J
Johannes Berg 已提交
2427
	if (!ifmgd->associated ||
2428
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2429
		return;
2430 2431 2432

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

J
Johannes Berg 已提交
2433 2434
	sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
		   mgmt->sa, reason_code);
2435

2436 2437
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2438
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2439 2440
}

2441 2442 2443 2444
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,
2445 2446
				int *min_rate, int *min_rate_index,
				int shift, u32 rate_flags)
2447 2448 2449 2450
{
	int i, j;

	for (i = 0; i < supp_rates_len; i++) {
2451
		int rate = supp_rates[i] & 0x7f;
2452 2453
		bool is_basic = !!(supp_rates[i] & 0x80);

2454
		if ((rate * 5 * (1 << shift)) > 110)
2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469
			*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++) {
2470 2471 2472 2473 2474 2475 2476 2477 2478
			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) {
2479 2480 2481
				*rates |= BIT(j);
				if (is_basic)
					*basic_rates |= BIT(j);
2482 2483
				if ((rate * 5) < *min_rate) {
					*min_rate = rate * 5;
2484 2485 2486 2487 2488 2489 2490
					*min_rate_index = j;
				}
				break;
			}
		}
	}
}
2491

J
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2492 2493 2494 2495 2496
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;

2497
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2498 2499 2500 2501 2502 2503

	if (!assoc) {
		sta_info_destroy_addr(sdata, assoc_data->bss->bssid);

		memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2504
		sdata->u.mgd.flags = 0;
2505
		mutex_lock(&sdata->local->mtx);
J
Johannes Berg 已提交
2506
		ieee80211_vif_release_channel(sdata);
2507
		mutex_unlock(&sdata->local->mtx);
J
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2508 2509 2510 2511 2512 2513 2514 2515
	}

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

static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
				    struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
2516
				    struct ieee80211_mgmt *mgmt, size_t len)
2517
{
2518
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2519
	struct ieee80211_local *local = sdata->local;
2520
	struct ieee80211_supported_band *sband;
2521
	struct sta_info *sta;
J
Johannes Berg 已提交
2522 2523
	u8 *pos;
	u16 capab_info, aid;
2524
	struct ieee802_11_elems elems;
J
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2525
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2526 2527
	const struct cfg80211_bss_ies *bss_ies = NULL;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
J
Johannes Berg 已提交
2528
	u32 changed = 0;
2529
	int err;
2530
	bool ret;
2531

J
Johannes Berg 已提交
2532
	/* AssocResp and ReassocResp have identical structure */
2533 2534

	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
J
Johannes Berg 已提交
2535
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2536

2537
	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
J
Johannes Berg 已提交
2538 2539
		sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
			   aid);
2540 2541
	aid &= ~(BIT(15) | BIT(14));

2542 2543 2544
	ifmgd->broken_ap = false;

	if (aid == 0 || aid > IEEE80211_MAX_AID) {
J
Johannes Berg 已提交
2545 2546
		sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
			   aid);
2547 2548 2549 2550
		aid = 0;
		ifmgd->broken_ap = true;
	}

J
Johannes Berg 已提交
2551
	pos = mgmt->u.assoc_resp.variable;
2552
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2553

2554
	if (!elems.supp_rates) {
J
Johannes Berg 已提交
2555
		sdata_info(sdata, "no SuppRates element in AssocResp\n");
J
Johannes Berg 已提交
2556
		return false;
2557 2558
	}

2559
	ifmgd->aid = aid;
2560

2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623
	/*
	 * 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");
		}
	}

2624 2625 2626 2627 2628 2629 2630
	/*
	 * 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,
2631 2632 2633
			   "HT AP is missing WMM params or HT capability/operation\n");
		ret = false;
		goto out;
2634 2635 2636 2637 2638
	}

	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    (!elems.vht_cap_elem || !elems.vht_operation)) {
		sdata_info(sdata,
2639 2640 2641
			   "VHT AP is missing VHT capability/operation\n");
		ret = false;
		goto out;
2642 2643
	}

2644 2645 2646 2647 2648
	mutex_lock(&sdata->local->sta_mtx);
	/*
	 * station info was already allocated and inserted before
	 * the association and should be available to us
	 */
2649
	sta = sta_info_get(sdata, cbss->bssid);
2650 2651
	if (WARN_ON(!sta)) {
		mutex_unlock(&sdata->local->sta_mtx);
2652 2653
		ret = false;
		goto out;
2654
	}
2655

J
Johannes Berg 已提交
2656
	sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2657

2658
	/* Set up internal HT/VHT capabilities */
2659
	if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
B
Ben Greear 已提交
2660
		ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2661
						  elems.ht_cap_elem, sta);
2662

M
Mahesh Palivela 已提交
2663 2664
	if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
		ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2665
						    elems.vht_cap_elem, sta);
M
Mahesh Palivela 已提交
2666

2667 2668 2669 2670 2671 2672
	/*
	 * 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.
	 */
2673

2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688
	/*
	 * 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;
	}

2689
	rate_control_rate_init(sta);
2690

2691
	if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
J
Johannes Berg 已提交
2692
		set_sta_flag(sta, WLAN_STA_MFP);
2693

2694
	sta->sta.wme = elems.wmm_param;
2695

2696
	err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2697 2698 2699
	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
2700 2701 2702
		sdata_info(sdata,
			   "failed to move station %pM to desired state\n",
			   sta->sta.addr);
2703 2704
		WARN_ON(__sta_info_destroy(sta));
		mutex_unlock(&sdata->local->sta_mtx);
2705 2706
		ret = false;
		goto out;
2707 2708
	}

2709
	mutex_unlock(&sdata->local->sta_mtx);
2710

2711 2712 2713 2714 2715 2716 2717 2718
	/*
	 * 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;

2719
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2720
		ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
J
Johannes Berg 已提交
2721
					 elems.wmm_param_len);
2722
	else
2723 2724
		ieee80211_set_wmm_default(sdata, false);
	changed |= BSS_CHANGED_QOS;
2725

J
Johannes Berg 已提交
2726 2727 2728 2729
	/* set AID and assoc capability,
	 * ieee80211_set_associated() will tell the driver */
	bss_conf->aid = aid;
	bss_conf->assoc_capability = capab_info;
2730
	ieee80211_set_associated(sdata, cbss, changed);
2731

2732 2733 2734 2735 2736 2737 2738
	/*
	 * 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);

2739
	/*
J
Johannes Berg 已提交
2740 2741
	 * Start timer to probe the connection to the AP now.
	 * Also start the timer that will detect beacon loss.
2742
	 */
J
Johannes Berg 已提交
2743
	ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2744
	ieee80211_sta_reset_beacon_monitor(sdata);
2745

2746 2747 2748 2749
	ret = true;
 out:
	kfree(bss_ies);
	return ret;
2750 2751
}

2752 2753 2754
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
2755 2756 2757 2758 2759 2760 2761
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
	u16 capab_info, status_code, aid;
	struct ieee802_11_elems elems;
	u8 *pos;
	bool reassoc;
2762
	struct cfg80211_bss *bss;
J
Johannes Berg 已提交
2763

2764
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2765 2766

	if (!assoc_data)
2767
		return;
2768
	if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2769
		return;
J
Johannes Berg 已提交
2770 2771 2772 2773 2774 2775 2776

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

	if (len < 24 + 6)
2777
		return;
J
Johannes Berg 已提交
2778 2779 2780 2781 2782 2783

	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
2784 2785 2786 2787
	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
2788 2789

	pos = mgmt->u.assoc_resp.variable;
2790
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2791 2792

	if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2793 2794
	    elems.timeout_int &&
	    elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
J
Johannes Berg 已提交
2795
		u32 tu, ms;
2796
		tu = le32_to_cpu(elems.timeout_int->value);
J
Johannes Berg 已提交
2797
		ms = tu * 1024 / 1000;
J
Johannes Berg 已提交
2798 2799 2800
		sdata_info(sdata,
			   "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
			   mgmt->sa, tu, ms);
J
Johannes Berg 已提交
2801
		assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2802
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
2803
		if (ms > IEEE80211_ASSOC_TIMEOUT)
2804 2805
			run_again(sdata, assoc_data->timeout);
		return;
J
Johannes Berg 已提交
2806 2807
	}

2808
	bss = assoc_data->bss;
J
Johannes Berg 已提交
2809 2810

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
2811 2812
		sdata_info(sdata, "%pM denied association (code=%d)\n",
			   mgmt->sa, status_code);
J
Johannes Berg 已提交
2813 2814
		ieee80211_destroy_assoc_data(sdata, false);
	} else {
2815
		if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
J
Johannes Berg 已提交
2816
			/* oops -- internal error -- send timeout for now */
2817
			ieee80211_destroy_assoc_data(sdata, false);
2818
			cfg80211_assoc_timeout(sdata->dev, bss);
2819
			return;
J
Johannes Berg 已提交
2820
		}
2821
		sdata_info(sdata, "associated\n");
2822 2823 2824 2825 2826 2827 2828

		/*
		 * destroy assoc_data afterwards, as otherwise an idle
		 * recalc after assoc_data is NULL but before associated
		 * is set can cause the interface to go idle
		 */
		ieee80211_destroy_assoc_data(sdata, true);
J
Johannes Berg 已提交
2829 2830
	}

2831
	cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len);
J
Johannes Berg 已提交
2832
}
J
Johannes Berg 已提交
2833

2834
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
2835
				  struct ieee80211_mgmt *mgmt, size_t len,
2836
				  struct ieee80211_rx_status *rx_status,
2837
				  struct ieee802_11_elems *elems)
2838 2839
{
	struct ieee80211_local *local = sdata->local;
2840
	struct ieee80211_bss *bss;
2841
	struct ieee80211_channel *channel;
2842

2843
	sdata_assert_lock(sdata);
2844

2845 2846
	channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
	if (!channel)
2847 2848 2849
		return;

	bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2850
					channel);
2851 2852
	if (bss) {
		sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
2853
		ieee80211_rx_bss_put(local, bss);
2854
	}
2855 2856 2857
}


2858
static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
2859
					 struct sk_buff *skb)
2860
{
J
Johannes Berg 已提交
2861
	struct ieee80211_mgmt *mgmt = (void *)skb->data;
2862
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
2863 2864
	struct ieee80211_rx_status *rx_status = (void *) skb->cb;
	size_t baselen, len = skb->len;
2865 2866
	struct ieee802_11_elems elems;

2867 2868
	ifmgd = &sdata->u.mgd;

2869
	sdata_assert_lock(sdata);
2870

2871
	if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2872 2873
		return; /* ignore ProbeResp to foreign address */

2874 2875 2876 2877 2878
	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
	if (baselen > len)
		return;

	ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2879
			       false, &elems);
2880

2881
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2882

2883
	if (ifmgd->associated &&
2884
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2885
		ieee80211_reset_ap_probe(sdata);
J
Johannes Berg 已提交
2886 2887

	if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2888
	    ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
J
Johannes Berg 已提交
2889
		/* got probe response, continue with auth */
J
Johannes Berg 已提交
2890
		sdata_info(sdata, "direct probe responded\n");
J
Johannes Berg 已提交
2891 2892
		ifmgd->auth_data->tries = 0;
		ifmgd->auth_data->timeout = jiffies;
2893
		ifmgd->auth_data->timeout_started = true;
2894
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
2895
	}
2896 2897
}

2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911
/*
 * This is the canonical list of information elements we care about,
 * the filter code also gives us all changes to the Microsoft OUI
 * (00:50:F2) vendor IE which is used for WMM which we need to track.
 *
 * We implement beacon filtering in software since that means we can
 * avoid processing the frame here and in cfg80211, and userspace
 * will not be able to tell whether the hardware supports it or not.
 *
 * XXX: This list needs to be dynamic -- userspace needs to be able to
 *	add items it requires. It also needs to be able to tell us to
 *	look out for other vendor IEs.
 */
static const u64 care_about_ies =
2912 2913 2914 2915 2916
	(1ULL << WLAN_EID_COUNTRY) |
	(1ULL << WLAN_EID_ERP_INFO) |
	(1ULL << WLAN_EID_CHANNEL_SWITCH) |
	(1ULL << WLAN_EID_PWR_CONSTRAINT) |
	(1ULL << WLAN_EID_HT_CAPABILITY) |
2917
	(1ULL << WLAN_EID_HT_OPERATION);
2918

2919 2920 2921
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)
2922
{
2923
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2924
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2925 2926
	size_t baselen;
	struct ieee802_11_elems elems;
2927
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
2928 2929
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
2930
	struct sta_info *sta;
2931
	u32 changed = 0;
2932
	bool erp_valid;
J
Johannes Berg 已提交
2933
	u8 erp_value = 0;
2934
	u32 ncrc;
2935
	u8 *bssid;
2936
	u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
2937

2938
	sdata_assert_lock(sdata);
2939

2940 2941 2942
	/* Process beacon from the current BSS */
	baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
	if (baselen > len)
2943
		return;
2944

J
Johannes Berg 已提交
2945 2946 2947 2948
	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		rcu_read_unlock();
2949
		return;
J
Johannes Berg 已提交
2950 2951
	}

2952
	if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
J
Johannes Berg 已提交
2953
		rcu_read_unlock();
2954
		return;
J
Johannes Berg 已提交
2955
	}
2956
	chan = chanctx_conf->def.chan;
J
Johannes Berg 已提交
2957
	rcu_read_unlock();
2958

2959
	if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2960
	    ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
J
Johannes Berg 已提交
2961
		ieee802_11_parse_elems(mgmt->u.beacon.variable,
2962
				       len - baselen, false, &elems);
2963

2964
		ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2965 2966 2967 2968
		if (elems.tim && !elems.parse_error) {
			const struct ieee80211_tim_ie *tim_ie = elems.tim;
			ifmgd->dtim_period = tim_ie->dtim_period;
		}
2969
		ifmgd->have_beacon = true;
2970
		ifmgd->assoc_data->need_beacon = false;
2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981
		if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
			sdata->vif.bss_conf.sync_tsf =
				le64_to_cpu(mgmt->u.beacon.timestamp);
			sdata->vif.bss_conf.sync_device_ts =
				rx_status->device_timestamp;
			if (elems.tim)
				sdata->vif.bss_conf.sync_dtim_count =
					elems.tim->dtim_count;
			else
				sdata->vif.bss_conf.sync_dtim_count = 0;
		}
J
Johannes Berg 已提交
2982 2983
		/* continue assoc process */
		ifmgd->assoc_data->timeout = jiffies;
2984
		ifmgd->assoc_data->timeout_started = true;
2985 2986
		run_again(sdata, ifmgd->assoc_data->timeout);
		return;
J
Johannes Berg 已提交
2987
	}
2988

J
Johannes Berg 已提交
2989
	if (!ifmgd->associated ||
2990
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2991
		return;
J
Johannes Berg 已提交
2992
	bssid = ifmgd->associated->bssid;
2993

2994 2995 2996 2997
	/* 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;
2998
		ifmgd->ave_beacon_signal = rx_status->signal * 16;
2999
		ifmgd->last_cqm_event_signal = 0;
3000
		ifmgd->count_beacon_signal = 1;
3001
		ifmgd->last_ave_beacon_signal = 0;
3002 3003 3004 3005 3006
	} else {
		ifmgd->ave_beacon_signal =
			(IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
			 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
			 ifmgd->ave_beacon_signal) / 16;
3007
		ifmgd->count_beacon_signal++;
3008
	}
3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021

	if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
		int sig = ifmgd->ave_beacon_signal;
		int last_sig = ifmgd->last_ave_beacon_signal;

		/*
		 * if signal crosses either of the boundaries, invoke callback
		 * with appropriate parameters
		 */
		if (sig > ifmgd->rssi_max_thold &&
		    (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
			ifmgd->last_ave_beacon_signal = sig;
3022
			drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
3023 3024 3025 3026
		} else if (sig < ifmgd->rssi_min_thold &&
			   (last_sig >= ifmgd->rssi_max_thold ||
			   last_sig == 0)) {
			ifmgd->last_ave_beacon_signal = sig;
3027
			drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
3028 3029 3030
		}
	}

3031
	if (bss_conf->cqm_rssi_thold &&
3032
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3033
	    !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054
		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);
		}
	}

3055
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
J
Johannes Berg 已提交
3056
		mlme_dbg_ratelimited(sdata,
3057
				     "cancelling AP probe due to a received beacon\n");
3058
		ieee80211_reset_ap_probe(sdata);
3059 3060
	}

J
Johannes Berg 已提交
3061 3062 3063 3064
	/*
	 * Push the beacon loss detection into the future since
	 * we are processing a beacon from the AP just now.
	 */
3065
	ieee80211_sta_reset_beacon_monitor(sdata);
J
Johannes Berg 已提交
3066

3067 3068
	ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
	ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3069
					  len - baselen, false, &elems,
3070 3071
					  care_about_ies, ncrc);

3072
	if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3073 3074 3075
		bool directed_tim = ieee80211_check_tim(elems.tim,
							elems.tim_len,
							ifmgd->aid);
3076
		if (directed_tim) {
3077
			if (local->hw.conf.dynamic_ps_timeout > 0) {
3078 3079 3080 3081 3082
				if (local->hw.conf.flags & IEEE80211_CONF_PS) {
					local->hw.conf.flags &= ~IEEE80211_CONF_PS;
					ieee80211_hw_config(local,
							    IEEE80211_CONF_CHANGE_PS);
				}
3083
				ieee80211_send_nullfunc(local, sdata, 0);
3084
			} else if (!local->pspolling && sdata->u.mgd.powersave) {
3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096
				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);
			}
3097 3098
		}
	}
J
Johannes Berg 已提交
3099

3100
	if (sdata->vif.p2p) {
J
Janusz Dziedzic 已提交
3101
		struct ieee80211_p2p_noa_attr noa = {};
3102 3103 3104 3105 3106
		int ret;

		ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
					    len - baselen,
					    IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3107
					    (u8 *) &noa, sizeof(noa));
J
Janusz Dziedzic 已提交
3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123
		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));
3124 3125 3126 3127 3128
			changed |= BSS_CHANGED_P2P_PS;
			ifmgd->beacon_crc_valid = false;
		}
	}

3129
	if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3130
		return;
3131
	ifmgd->beacon_crc = ncrc;
3132
	ifmgd->beacon_crc_valid = true;
3133

3134
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3135

3136 3137 3138
	ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
					 &elems, true);

3139 3140
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
	    ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3141 3142 3143
				     elems.wmm_param_len))
		changed |= BSS_CHANGED_QOS;

3144 3145
	/*
	 * If we haven't had a beacon before, tell the driver about the
3146
	 * DTIM period (and beacon timing if desired) now.
3147
	 */
3148
	if (!ifmgd->have_beacon) {
3149 3150 3151 3152 3153
		/* 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;
3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166

		if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
			sdata->vif.bss_conf.sync_tsf =
				le64_to_cpu(mgmt->u.beacon.timestamp);
			sdata->vif.bss_conf.sync_device_ts =
				rx_status->device_timestamp;
			if (elems.tim)
				sdata->vif.bss_conf.sync_dtim_count =
					elems.tim->dtim_count;
			else
				sdata->vif.bss_conf.sync_dtim_count = 0;
		}

3167 3168
		changed |= BSS_CHANGED_BEACON_INFO;
		ifmgd->have_beacon = true;
3169 3170 3171 3172 3173

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

3174
		ieee80211_recalc_ps_vif(sdata);
3175 3176
	}

3177
	if (elems.erp_info) {
J
Johannes Berg 已提交
3178 3179 3180 3181
		erp_valid = true;
		erp_value = elems.erp_info[0];
	} else {
		erp_valid = false;
3182
	}
J
Johannes Berg 已提交
3183 3184 3185
	changed |= ieee80211_handle_bss_capability(sdata,
			le16_to_cpu(mgmt->u.beacon.capab_info),
			erp_valid, erp_value);
3186

3187
	mutex_lock(&local->sta_mtx);
3188 3189
	sta = sta_info_get(sdata, bssid);

3190 3191
	if (ieee80211_config_bw(sdata, sta,
				elems.ht_cap_elem, elems.ht_operation,
3192 3193 3194 3195 3196
				elems.vht_operation, bssid, &changed)) {
		mutex_unlock(&local->sta_mtx);
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_DEAUTH_LEAVING,
				       true, deauth_buf);
3197 3198
		cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
				      sizeof(deauth_buf));
3199
		return;
3200
	}
3201 3202 3203 3204

	if (sta && elems.opmode_notif)
		ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
					    rx_status->band, true);
3205
	mutex_unlock(&local->sta_mtx);
3206

3207 3208 3209
	if (elems.country_elem && elems.pwr_constr_elem &&
	    mgmt->u.probe_resp.capab_info &
				cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
3210 3211 3212 3213
		changed |= ieee80211_handle_pwr_constr(sdata, chan,
						       elems.country_elem,
						       elems.country_elem_len,
						       elems.pwr_constr_elem);
3214

3215
	ieee80211_bss_info_change_notify(sdata, changed);
3216 3217
}

3218 3219
void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
				  struct sk_buff *skb)
3220 3221 3222 3223
{
	struct ieee80211_rx_status *rx_status;
	struct ieee80211_mgmt *mgmt;
	u16 fc;
3224 3225
	struct ieee802_11_elems elems;
	int ies_len;
3226 3227 3228 3229 3230

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

3231
	sdata_lock(sdata);
3232

J
Johannes Berg 已提交
3233 3234
	switch (fc & IEEE80211_FCTL_STYPE) {
	case IEEE80211_STYPE_BEACON:
3235
		ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
J
Johannes Berg 已提交
3236 3237 3238 3239 3240
		break;
	case IEEE80211_STYPE_PROBE_RESP:
		ieee80211_rx_mgmt_probe_resp(sdata, skb);
		break;
	case IEEE80211_STYPE_AUTH:
3241
		ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3242 3243
		break;
	case IEEE80211_STYPE_DEAUTH:
3244
		ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3245 3246
		break;
	case IEEE80211_STYPE_DISASSOC:
3247
		ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3248 3249 3250
		break;
	case IEEE80211_STYPE_ASSOC_RESP:
	case IEEE80211_STYPE_REASSOC_RESP:
3251
		ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3252 3253
		break;
	case IEEE80211_STYPE_ACTION:
3254
		if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3255 3256 3257
			ies_len = skb->len -
				  offsetof(struct ieee80211_mgmt,
					   u.action.u.chan_switch.variable);
3258 3259 3260 3261 3262 3263

			if (ies_len < 0)
				break;

			ieee802_11_parse_elems(
				mgmt->u.action.u.chan_switch.variable,
3264
				ies_len, true, &elems);
3265 3266 3267 3268

			if (elems.parse_error)
				break;

3269 3270
			ieee80211_sta_process_chanswitch(sdata,
							 rx_status->mactime,
3271
							 &elems, false);
3272 3273 3274 3275 3276 3277 3278 3279 3280 3281
		} 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,
3282
				ies_len, true, &elems);
3283 3284 3285 3286 3287 3288 3289 3290

			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
3291
			ieee80211_sta_process_chanswitch(sdata,
3292
							 rx_status->mactime,
3293
							 &elems, false);
3294
		}
3295
		break;
3296
	}
3297
	sdata_unlock(sdata);
3298 3299
}

J
Johannes Berg 已提交
3300
static void ieee80211_sta_timer(unsigned long data)
3301
{
J
Johannes Berg 已提交
3302 3303
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
3304

3305
	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3306 3307
}

3308
static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3309
					  u8 *bssid, u8 reason, bool tx)
3310
{
3311
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3312

3313
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3314
			       tx, frame_buf);
3315

3316 3317
	cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
			      IEEE80211_DEAUTH_FRAME_LEN);
3318 3319
}

J
Johannes Berg 已提交
3320 3321 3322 3323 3324
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;
3325
	u32 tx_flags = 0;
J
Johannes Berg 已提交
3326

3327
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3328 3329 3330 3331 3332 3333 3334

	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
3335 3336
		sdata_info(sdata, "authentication with %pM timed out\n",
			   auth_data->bss->bssid);
J
Johannes Berg 已提交
3337 3338 3339 3340 3341 3342 3343 3344 3345 3346

		/*
		 * 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
3347 3348
	drv_mgd_prepare_tx(local, sdata);

J
Johannes Berg 已提交
3349
	if (auth_data->bss->proberesp_ies) {
3350 3351 3352
		u16 trans = 1;
		u16 status = 0;

J
Johannes Berg 已提交
3353 3354 3355
		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
3356 3357

		auth_data->expected_transaction = 2;
3358 3359 3360 3361 3362 3363 3364

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

3365 3366 3367 3368
		if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
			tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
				   IEEE80211_TX_INTFL_MLME_CONN_TX;

3369 3370
		ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
				    auth_data->data, auth_data->data_len,
J
Johannes Berg 已提交
3371
				    auth_data->bss->bssid,
3372 3373
				    auth_data->bss->bssid, NULL, 0, 0,
				    tx_flags);
J
Johannes Berg 已提交
3374 3375 3376
	} else {
		const u8 *ssidie;

J
Johannes Berg 已提交
3377 3378 3379
		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
3380

3381
		rcu_read_lock();
J
Johannes Berg 已提交
3382
		ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3383 3384
		if (!ssidie) {
			rcu_read_unlock();
J
Johannes Berg 已提交
3385
			return -EINVAL;
3386
		}
J
Johannes Berg 已提交
3387 3388 3389 3390 3391
		/*
		 * Direct probe is sent to broadcast address as some APs
		 * will not answer to direct packet in unassociated state.
		 */
		ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3392
					 NULL, 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
3393
					 auth_data->bss->channel, false);
3394
		rcu_read_unlock();
J
Johannes Berg 已提交
3395 3396
	}

3397
	if (tx_flags == 0) {
3398
		auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3399
		auth_data->timeout_started = true;
3400
		run_again(sdata, auth_data->timeout);
3401
	} else {
3402 3403 3404 3405
		auth_data->timeout =
			round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
		auth_data->timeout_started = true;
		run_again(sdata, auth_data->timeout);
3406
	}
J
Johannes Berg 已提交
3407 3408 3409 3410 3411 3412 3413 3414 3415

	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;

3416
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3417 3418 3419

	assoc_data->tries++;
	if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
J
Johannes Berg 已提交
3420 3421
		sdata_info(sdata, "association with %pM timed out\n",
			   assoc_data->bss->bssid);
J
Johannes Berg 已提交
3422 3423 3424 3425 3426 3427 3428 3429 3430 3431

		/*
		 * 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
3432 3433 3434
	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
3435 3436
	ieee80211_send_assoc(sdata);

3437 3438
	if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
		assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3439
		assoc_data->timeout_started = true;
3440
		run_again(sdata, assoc_data->timeout);
3441
	} else {
3442 3443 3444 3445 3446
		assoc_data->timeout =
			round_jiffies_up(jiffies +
					 IEEE80211_ASSOC_TIMEOUT_LONG);
		assoc_data->timeout_started = true;
		run_again(sdata, assoc_data->timeout);
3447
	}
J
Johannes Berg 已提交
3448 3449 3450 3451

	return 0;
}

3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463
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);
}

3464
void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
3465 3466
{
	struct ieee80211_local *local = sdata->local;
3467
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3468

3469
	sdata_lock(sdata);
3470

3471 3472 3473 3474 3475 3476 3477 3478 3479 3480
	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;
3481
				run_again(sdata, ifmgd->auth_data->timeout);
3482 3483 3484
			} else {
				ifmgd->auth_data->timeout = jiffies - 1;
			}
3485
			ifmgd->auth_data->timeout_started = true;
3486 3487 3488 3489 3490 3491
		} 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;
3492
				run_again(sdata, ifmgd->assoc_data->timeout);
3493 3494 3495
			} else {
				ifmgd->assoc_data->timeout = jiffies - 1;
			}
3496
			ifmgd->assoc_data->timeout_started = true;
3497 3498 3499
		}
	}

3500
	if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
J
Johannes Berg 已提交
3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514
	    time_after(jiffies, ifmgd->auth_data->timeout)) {
		if (ifmgd->auth_data->done) {
			/*
			 * ok ... we waited for assoc but userspace didn't,
			 * so let's just kill the auth data
			 */
			ieee80211_destroy_auth_data(sdata, false);
		} else if (ieee80211_probe_auth(sdata)) {
			u8 bssid[ETH_ALEN];

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

			ieee80211_destroy_auth_data(sdata, false);

3515
			cfg80211_auth_timeout(sdata->dev, bssid);
J
Johannes Berg 已提交
3516
		}
3517
	} else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3518
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
3519

3520
	if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
J
Johannes Berg 已提交
3521
	    time_after(jiffies, ifmgd->assoc_data->timeout)) {
3522
		if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
J
Johannes Berg 已提交
3523
		    ieee80211_do_assoc(sdata)) {
3524
			struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
J
Johannes Berg 已提交
3525 3526

			ieee80211_destroy_assoc_data(sdata, false);
3527
			cfg80211_assoc_timeout(sdata->dev, bss);
J
Johannes Berg 已提交
3528
		}
3529
	} else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3530
		run_again(sdata, ifmgd->assoc_data->timeout);
J
Johannes Berg 已提交
3531

3532
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
J
Johannes Berg 已提交
3533
	    ifmgd->associated) {
3534
		u8 bssid[ETH_ALEN];
3535
		int max_tries;
3536

3537
		memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3538

3539
		if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3540
			max_tries = max_nullfunc_tries;
3541
		else
3542
			max_tries = max_probe_tries;
3543

3544 3545 3546
		/* ACK received for nullfunc probing frame */
		if (!ifmgd->probe_send_count)
			ieee80211_reset_ap_probe(sdata);
3547 3548
		else if (ifmgd->nullfunc_failed) {
			if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3549 3550 3551 3552
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
					 bssid, ifmgd->probe_send_count,
					 max_tries);
3553 3554
				ieee80211_mgd_probe_ap_send(sdata);
			} else {
J
Johannes Berg 已提交
3555 3556 3557
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
					 bssid);
3558
				ieee80211_sta_connection_lost(sdata, bssid,
3559 3560
					WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
					false);
3561 3562
			}
		} else if (time_is_after_jiffies(ifmgd->probe_timeout))
3563
			run_again(sdata, ifmgd->probe_timeout);
3564
		else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
J
Johannes Berg 已提交
3565 3566 3567
			mlme_dbg(sdata,
				 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
				 bssid, probe_wait_ms);
3568
			ieee80211_sta_connection_lost(sdata, bssid,
3569
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3570
		} else if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3571 3572 3573 3574
			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);
3575 3576
			ieee80211_mgd_probe_ap_send(sdata);
		} else {
J
Johannes Berg 已提交
3577 3578 3579 3580
			/*
			 * We actually lost the connection ... or did we?
			 * Let's make sure!
			 */
3581 3582 3583 3584
			wiphy_debug(local->hw.wiphy,
				    "%s: No probe response from AP %pM"
				    " after %dms, disconnecting.\n",
				    sdata->name,
3585
				    bssid, probe_wait_ms);
3586

3587
			ieee80211_sta_connection_lost(sdata, bssid,
3588
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
J
Johannes Berg 已提交
3589 3590 3591
		}
	}

3592
	sdata_unlock(sdata);
3593 3594
}

J
Johannes Berg 已提交
3595 3596 3597 3598 3599 3600 3601 3602 3603
static void ieee80211_sta_bcn_mon_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
	struct ieee80211_local *local = sdata->local;

	if (local->quiescing)
		return;

M
Michal Kazior 已提交
3604 3605 3606
	if (sdata->vif.csa_active)
		return;

3607
	sdata->u.mgd.connection_loss = false;
3608 3609
	ieee80211_queue_work(&sdata->local->hw,
			     &sdata->u.mgd.beacon_connection_loss_work);
J
Johannes Berg 已提交
3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621
}

static void ieee80211_sta_conn_mon_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_local *local = sdata->local;

	if (local->quiescing)
		return;

M
Michal Kazior 已提交
3622 3623 3624
	if (sdata->vif.csa_active)
		return;

3625
	ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
J
Johannes Berg 已提交
3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636
}

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
3637 3638
static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
3639 3640
	u32 flags;

3641
	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3642
		__ieee80211_stop_poll(sdata);
3643

J
Johannes Berg 已提交
3644
		/* let's probe the connection once */
3645 3646 3647 3648
		flags = sdata->local->hw.flags;
		if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
			ieee80211_queue_work(&sdata->local->hw,
					     &sdata->u.mgd.monitor_work);
J
Johannes Berg 已提交
3649
		/* and do all the other regular work too */
J
Johannes Berg 已提交
3650
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3651
	}
J
Johannes Berg 已提交
3652
}
3653

3654
#ifdef CONFIG_PM
3655 3656 3657 3658 3659 3660 3661
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);

3662 3663 3664 3665 3666
	if (ifmgd->auth_data || ifmgd->assoc_data) {
		const u8 *bssid = ifmgd->auth_data ?
				ifmgd->auth_data->bss->bssid :
				ifmgd->assoc_data->bss->bssid;

3667
		/*
3668 3669 3670
		 * 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.
3671
		 */
3672
		ieee80211_send_deauth_disassoc(sdata, bssid,
3673 3674 3675
					       IEEE80211_STYPE_DEAUTH,
					       WLAN_REASON_DEAUTH_LEAVING,
					       false, frame_buf);
3676 3677 3678 3679
		if (ifmgd->assoc_data)
			ieee80211_destroy_assoc_data(sdata, false);
		if (ifmgd->auth_data)
			ieee80211_destroy_auth_data(sdata, false);
3680 3681 3682 3683 3684 3685 3686
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
	}

	sdata_unlock(sdata);
}

3687 3688 3689 3690
void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

3691
	sdata_lock(sdata);
3692
	if (!ifmgd->associated) {
3693
		sdata_unlock(sdata);
3694 3695 3696 3697 3698 3699 3700 3701 3702 3703
		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);
3704
		sdata_unlock(sdata);
3705 3706
		return;
	}
3707
	sdata_unlock(sdata);
3708 3709 3710
}
#endif

J
Johannes Berg 已提交
3711 3712
/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3713
{
3714
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
3715

3716
	ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3717
	INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3718
	INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3719 3720
	INIT_WORK(&ifmgd->beacon_connection_loss_work,
		  ieee80211_beacon_connection_loss_work);
3721 3722
	INIT_WORK(&ifmgd->csa_connection_drop_work,
		  ieee80211_csa_connection_drop_work);
3723
	INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
3724 3725
	INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
			  ieee80211_tdls_peer_del_work);
3726
	setup_timer(&ifmgd->timer, ieee80211_sta_timer,
S
Sujith 已提交
3727
		    (unsigned long) sdata);
J
Johannes Berg 已提交
3728 3729 3730 3731
	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);
3732
	setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
J
Johannes Berg 已提交
3733 3734
		    (unsigned long) sdata);

3735
	ifmgd->flags = 0;
3736
	ifmgd->powersave = sdata->wdev.ps;
3737 3738
	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
3739
	ifmgd->p2p_noa_index = -1;
J
Johannes Berg 已提交
3740

3741 3742 3743 3744
	if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
		ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
	else
		ifmgd->req_smps = IEEE80211_SMPS_OFF;
3745 3746
}

3747 3748
/* scan finished notification */
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
J
Johannes Berg 已提交
3749
{
3750
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
3751

3752 3753
	/* Restart STA timers */
	rcu_read_lock();
3754 3755 3756 3757
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (ieee80211_sdata_running(sdata))
			ieee80211_restart_sta_timer(sdata);
	}
3758 3759
	rcu_read_unlock();
}
J
Johannes Berg 已提交
3760

3761 3762 3763 3764 3765 3766 3767
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);
3768

3769 3770 3771
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, latency_usec);
	mutex_unlock(&local->iflist_mtx);
3772

3773
	return NOTIFY_OK;
J
Johannes Berg 已提交
3774 3775
}

J
Johannes Berg 已提交
3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787
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;

3788
	ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
J
Johannes Berg 已提交
3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800
	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;

3801
	vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
J
Johannes Berg 已提交
3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819
	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;
}

3820 3821
static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
				  struct cfg80211_bss *cbss)
3822 3823 3824
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3825
	const struct ieee80211_ht_cap *ht_cap = NULL;
3826
	const struct ieee80211_ht_operation *ht_oper = NULL;
J
Johannes Berg 已提交
3827
	const struct ieee80211_vht_operation *vht_oper = NULL;
3828
	struct ieee80211_supported_band *sband;
3829
	struct cfg80211_chan_def chandef;
J
Johannes Berg 已提交
3830
	int ret;
3831

3832 3833
	sband = local->hw.wiphy->bands[cbss->channel->band];

J
Johannes Berg 已提交
3834 3835 3836 3837
	ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
			  IEEE80211_STA_DISABLE_80P80MHZ |
			  IEEE80211_STA_DISABLE_160MHZ);

3838 3839
	rcu_read_lock();

J
Johannes Berg 已提交
3840 3841
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	    sband->ht_cap.ht_supported) {
3842
		const u8 *ht_oper_ie, *ht_cap_ie;
3843

3844
		ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3845 3846
		if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
			ht_oper = (void *)(ht_oper_ie + 2);
3847

3848 3849 3850 3851 3852
		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) {
3853 3854 3855
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ht_oper = NULL;
		}
3856 3857
	}

J
Johannes Berg 已提交
3858 3859
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    sband->vht_cap.vht_supported) {
3860
		const u8 *vht_oper_ie, *vht_cap;
J
Johannes Berg 已提交
3861

3862 3863
		vht_oper_ie = ieee80211_bss_get_ie(cbss,
						   WLAN_EID_VHT_OPERATION);
J
Johannes Berg 已提交
3864 3865 3866 3867
		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
3868
			sdata_info(sdata,
J
Johannes Berg 已提交
3869
				   "AP advertised VHT without HT, disabling both\n");
3870 3871
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3872
		}
3873 3874 3875 3876 3877 3878

		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;
		}
3879 3880
	}

J
Johannes Berg 已提交
3881 3882
	ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
						     cbss->channel,
3883
						     ht_cap, ht_oper, vht_oper,
3884
						     &chandef, false);
3885

J
Johannes Berg 已提交
3886 3887
	sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
				      local->rx_chains);
3888

3889 3890
	rcu_read_unlock();

3891 3892 3893
	/* will change later if needed */
	sdata->smps_mode = IEEE80211_SMPS_OFF;

3894
	mutex_lock(&local->mtx);
J
Johannes Berg 已提交
3895 3896 3897 3898 3899 3900 3901
	/*
	 * 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);
3902 3903 3904 3905

	/* don't downgrade for 5 and 10 MHz channels, though. */
	if (chandef.width == NL80211_CHAN_WIDTH_5 ||
	    chandef.width == NL80211_CHAN_WIDTH_10)
3906
		goto out;
3907

3908
	while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3909
		ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
3910 3911 3912
		ret = ieee80211_vif_use_channel(sdata, &chandef,
						IEEE80211_CHANCTX_SHARED);
	}
3913 3914
 out:
	mutex_unlock(&local->mtx);
J
Johannes Berg 已提交
3915
	return ret;
3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941
}

static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
				     struct cfg80211_bss *cbss, bool assoc)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_bss *bss = (void *)cbss->priv;
	struct sta_info *new_sta = NULL;
	bool have_sta = false;
	int err;

	if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
		return -EINVAL;

	if (assoc) {
		rcu_read_lock();
		have_sta = sta_info_get(sdata, cbss->bssid);
		rcu_read_unlock();
	}

	if (!have_sta) {
		new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
		if (!new_sta)
			return -ENOMEM;
	}
J
Johannes Berg 已提交
3942
	if (new_sta) {
3943 3944 3945
		u32 rates = 0, basic_rates = 0;
		bool have_higher_than_11mbit;
		int min_rate = INT_MAX, min_rate_index = -1;
3946
		struct ieee80211_chanctx_conf *chanctx_conf;
3947
		struct ieee80211_supported_band *sband;
J
Johannes Berg 已提交
3948
		const struct cfg80211_bss_ies *ies;
3949 3950
		int shift;
		u32 rate_flags;
3951 3952 3953 3954 3955 3956

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

		err = ieee80211_prep_channel(sdata, cbss);
		if (err) {
			sta_info_free(local, new_sta);
3957
			return -EINVAL;
3958
		}
3959 3960 3961 3962 3963 3964
		shift = ieee80211_vif_get_shift(&sdata->vif);

		rcu_read_lock();
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (WARN_ON(!chanctx_conf)) {
			rcu_read_unlock();
E
Eytan Lifshitz 已提交
3965
			sta_info_free(local, new_sta);
3966 3967 3968 3969
			return -EINVAL;
		}
		rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
		rcu_read_unlock();
3970 3971 3972 3973 3974

		ieee80211_get_rates(sband, bss->supp_rates,
				    bss->supp_rates_len,
				    &rates, &basic_rates,
				    &have_higher_than_11mbit,
3975 3976
				    &min_rate, &min_rate_index,
				    shift, rate_flags);
3977 3978 3979 3980 3981 3982 3983 3984 3985 3986

		/*
		 * 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
3987 3988
			sdata_info(sdata,
				   "No basic rates, using min rate instead\n");
3989 3990 3991
			basic_rates = BIT(min_rate_index);
		}

J
Johannes Berg 已提交
3992
		new_sta->sta.supp_rates[cbss->channel->band] = rates;
3993 3994 3995
		sdata->vif.bss_conf.basic_rates = basic_rates;

		/* cf. IEEE 802.11 9.2.12 */
J
Johannes Berg 已提交
3996
		if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3997 3998 3999 4000 4001 4002 4003
		    have_higher_than_11mbit)
			sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
		else
			sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

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

4004 4005
		/* set timing information */
		sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
J
Johannes Berg 已提交
4006
		rcu_read_lock();
4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032
		ies = rcu_dereference(cbss->beacon_ies);
		if (ies) {
			const u8 *tim_ie;

			sdata->vif.bss_conf.sync_tsf = ies->tsf;
			sdata->vif.bss_conf.sync_device_ts =
				bss->device_ts_beacon;
			tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
						  ies->data, ies->len);
			if (tim_ie && tim_ie[1] >= 2)
				sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
			else
				sdata->vif.bss_conf.sync_dtim_count = 0;
		} else if (!(local->hw.flags &
					IEEE80211_HW_TIMING_BEACON_ONLY)) {
			ies = rcu_dereference(cbss->proberesp_ies);
			/* must be non-NULL since beacon IEs were NULL */
			sdata->vif.bss_conf.sync_tsf = ies->tsf;
			sdata->vif.bss_conf.sync_device_ts =
				bss->device_ts_presp;
			sdata->vif.bss_conf.sync_dtim_count = 0;
		} else {
			sdata->vif.bss_conf.sync_tsf = 0;
			sdata->vif.bss_conf.sync_device_ts = 0;
			sdata->vif.bss_conf.sync_dtim_count = 0;
		}
J
Johannes Berg 已提交
4033
		rcu_read_unlock();
4034 4035

		/* tell driver about BSSID, basic rates and timing */
4036
		ieee80211_bss_info_change_notify(sdata,
4037 4038
			BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
			BSS_CHANGED_BEACON_INT);
4039 4040

		if (assoc)
J
Johannes Berg 已提交
4041
			sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4042

J
Johannes Berg 已提交
4043 4044
		err = sta_info_insert(new_sta);
		new_sta = NULL;
4045
		if (err) {
J
Johannes Berg 已提交
4046 4047 4048
			sdata_info(sdata,
				   "failed to insert STA entry for the AP (error %d)\n",
				   err);
4049 4050 4051
			return err;
		}
	} else
4052
		WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4053 4054 4055 4056

	return 0;
}

4057 4058 4059
/* config hooks */
int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
		       struct cfg80211_auth_request *req)
J
Johannes Berg 已提交
4060
{
J
Johannes Berg 已提交
4061 4062 4063
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data;
4064
	u16 auth_alg;
J
Johannes Berg 已提交
4065 4066 4067
	int err;

	/* prepare auth data structure */
J
Johannes Berg 已提交
4068

4069 4070 4071 4072 4073
	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
4074
		if (IS_ERR(local->wep_tx_tfm))
4075
			return -EOPNOTSUPP;
4076 4077 4078 4079 4080 4081 4082 4083
		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;
4084 4085 4086
	case NL80211_AUTHTYPE_SAE:
		auth_alg = WLAN_AUTH_SAE;
		break;
4087 4088
	default:
		return -EOPNOTSUPP;
J
Johannes Berg 已提交
4089
	}
4090

4091 4092
	auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
			    req->ie_len, GFP_KERNEL);
J
Johannes Berg 已提交
4093
	if (!auth_data)
J
Johannes Berg 已提交
4094
		return -ENOMEM;
4095

J
Johannes Berg 已提交
4096
	auth_data->bss = req->bss;
4097

4098 4099 4100 4101 4102 4103 4104 4105 4106
	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;
	}

4107
	if (req->ie && req->ie_len) {
4108 4109 4110
		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
4111
	}
4112

J
Johannes Berg 已提交
4113
	if (req->key && req->key_len) {
J
Johannes Berg 已提交
4114 4115 4116
		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
4117 4118
	}

J
Johannes Berg 已提交
4119
	auth_data->algorithm = auth_alg;
J
Johannes Berg 已提交
4120

J
Johannes Berg 已提交
4121
	/* try to authenticate/probe */
4122

J
Johannes Berg 已提交
4123 4124 4125 4126
	if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
	    ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
4127 4128
	}

J
Johannes Berg 已提交
4129 4130
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
4131

J
Johannes Berg 已提交
4132 4133
	/* prep auth_data so we don't go into idle on disassoc */
	ifmgd->auth_data = auth_data;
J
Johannes Berg 已提交
4134

4135 4136 4137 4138 4139 4140 4141
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

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

4142 4143
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      sizeof(frame_buf));
4144
	}
J
Johannes Berg 已提交
4145

J
Johannes Berg 已提交
4146
	sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4147

4148 4149
	err = ieee80211_prep_connection(sdata, req->bss, false);
	if (err)
J
Johannes Berg 已提交
4150
		goto err_clear;
J
Johannes Berg 已提交
4151

J
Johannes Berg 已提交
4152 4153 4154 4155 4156 4157 4158
	err = ieee80211_probe_auth(sdata);
	if (err) {
		sta_info_destroy_addr(sdata, req->bss->bssid);
		goto err_clear;
	}

	/* hold our own reference */
4159
	cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4160
	return 0;
J
Johannes Berg 已提交
4161 4162

 err_clear:
4163 4164
	memset(ifmgd->bssid, 0, ETH_ALEN);
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4165 4166 4167 4168
	ifmgd->auth_data = NULL;
 err_free:
	kfree(auth_data);
	return err;
J
Johannes Berg 已提交
4169 4170
}

4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208
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;
}

4209 4210
int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
			struct cfg80211_assoc_request *req)
4211
{
J
Johannes Berg 已提交
4212
	struct ieee80211_local *local = sdata->local;
4213
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4214
	struct ieee80211_bss *bss = (void *)req->bss->priv;
J
Johannes Berg 已提交
4215
	struct ieee80211_mgd_assoc_data *assoc_data;
4216
	const struct cfg80211_bss_ies *beacon_ies;
J
Johannes Berg 已提交
4217
	struct ieee80211_supported_band *sband;
4218
	const u8 *ssidie, *ht_ie, *vht_ie;
4219
	int i, err;
4220

J
Johannes Berg 已提交
4221 4222 4223 4224
	assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
	if (!assoc_data)
		return -ENOMEM;

4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235
	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();

4236 4237 4238 4239 4240 4241 4242
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

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

4243 4244
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      sizeof(frame_buf));
4245
	}
J
Johannes Berg 已提交
4246 4247 4248 4249

	if (ifmgd->auth_data && !ifmgd->auth_data->done) {
		err = -EBUSY;
		goto err_free;
J
Johannes Berg 已提交
4250
	}
4251

J
Johannes Berg 已提交
4252 4253 4254 4255
	if (ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
	}
4256

J
Johannes Berg 已提交
4257 4258 4259 4260
	if (ifmgd->auth_data) {
		bool match;

		/* keep sta info, bssid if matching */
4261
		match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
J
Johannes Berg 已提交
4262
		ieee80211_destroy_auth_data(sdata, match);
4263 4264
	}

J
Johannes Berg 已提交
4265
	/* prepare assoc data */
4266

4267 4268
	ifmgd->beacon_crc_valid = false;

4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304
	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
4305 4306 4307 4308 4309 4310 4311
	/*
	 * 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.
	 */
4312
	for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4313 4314
		if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4315
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4316
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4317
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4318
			netdev_info(sdata->dev,
4319
				    "disabling HT/VHT due to WEP/TKIP use\n");
4320 4321
		}
	}
4322

4323
	if (req->flags & ASSOC_REQ_DISABLE_HT) {
4324
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4325 4326
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
	}
B
Ben Greear 已提交
4327

4328 4329 4330
	if (req->flags & ASSOC_REQ_DISABLE_VHT)
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;

J
Johannes Berg 已提交
4331 4332 4333
	/* 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 ||
4334 4335
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4336
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4337 4338
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4339 4340
			netdev_info(sdata->dev,
				    "disabling HT as WMM/QoS is not supported by the AP\n");
4341
	}
J
Johannes Berg 已提交
4342

4343 4344
	/* disable VHT if we don't support it or the AP doesn't use WMM */
	if (!sband->vht_cap.vht_supported ||
4345 4346
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4347
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4348 4349
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4350 4351
			netdev_info(sdata->dev,
				    "disabling VHT as WMM/QoS is not supported by the AP\n");
4352 4353
	}

B
Ben Greear 已提交
4354 4355 4356 4357
	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));

4358 4359 4360 4361
	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));

4362
	if (req->ie && req->ie_len) {
J
Johannes Berg 已提交
4363 4364 4365
		memcpy(assoc_data->ie, req->ie, req->ie_len);
		assoc_data->ie_len = req->ie_len;
	}
4366

J
Johannes Berg 已提交
4367
	assoc_data->bss = req->bss;
4368

J
Johannes Berg 已提交
4369 4370
	if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
		if (ifmgd->powersave)
4371
			sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
J
Johannes Berg 已提交
4372
		else
4373
			sdata->smps_mode = IEEE80211_SMPS_OFF;
J
Johannes Berg 已提交
4374
	} else
4375
		sdata->smps_mode = ifmgd->req_smps;
J
Johannes Berg 已提交
4376

J
Johannes Berg 已提交
4377 4378 4379
	assoc_data->capability = req->bss->capability;
	assoc_data->supp_rates = bss->supp_rates;
	assoc_data->supp_rates_len = bss->supp_rates_len;
4380

4381
	rcu_read_lock();
4382 4383 4384 4385 4386
	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
4387
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4388 4389 4390 4391 4392 4393
	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;
4394
	rcu_read_unlock();
4395

K
Kalle Valo 已提交
4396
	if (bss->wmm_used && bss->uapsd_supported &&
4397 4398
	    (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) &&
	    sdata->wmm_acm != 0xff) {
4399
		assoc_data->uapsd = true;
K
Kalle Valo 已提交
4400 4401
		ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
	} else {
4402
		assoc_data->uapsd = false;
K
Kalle Valo 已提交
4403 4404 4405
		ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
	}

4406
	if (req->prev_bssid)
J
Johannes Berg 已提交
4407
		memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4408 4409 4410 4411 4412 4413 4414 4415 4416

	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;
	}

4417 4418 4419 4420 4421
	if (req->flags & ASSOC_REQ_USE_RRM)
		ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
	else
		ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;

4422 4423 4424 4425 4426
	if (req->crypto.control_port)
		ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
	else
		ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;

4427 4428
	sdata->control_port_protocol = req->crypto.control_port_ethertype;
	sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4429 4430
	sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
							sdata->vif.type);
4431

J
Johannes Berg 已提交
4432 4433 4434
	/* kick off associate process */

	ifmgd->assoc_data = assoc_data;
4435
	ifmgd->dtim_period = 0;
4436
	ifmgd->have_beacon = false;
J
Johannes Berg 已提交
4437

4438 4439 4440
	err = ieee80211_prep_connection(sdata, req->bss, true);
	if (err)
		goto err_clear;
J
Johannes Berg 已提交
4441

4442 4443
	rcu_read_lock();
	beacon_ies = rcu_dereference(req->bss->beacon_ies);
4444

4445 4446 4447 4448 4449 4450 4451 4452 4453
	if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
	    !beacon_ies) {
		/*
		 * Wait up to one beacon interval ...
		 * should this be more if we miss one?
		 */
		sdata_info(sdata, "waiting for beacon from %pM\n",
			   ifmgd->bssid);
		assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4454
		assoc_data->timeout_started = true;
4455 4456 4457 4458 4459
		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);
4460 4461
		u8 dtim_count = 0;

4462 4463 4464 4465
		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;
4466
			dtim_count = tim->dtim_count;
4467
		}
4468
		ifmgd->have_beacon = true;
J
Johannes Berg 已提交
4469
		assoc_data->timeout = jiffies;
4470
		assoc_data->timeout_started = true;
4471 4472 4473 4474 4475 4476 4477

		if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
			sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
			sdata->vif.bss_conf.sync_device_ts =
				bss->device_ts_beacon;
			sdata->vif.bss_conf.sync_dtim_count = dtim_count;
		}
4478 4479
	} else {
		assoc_data->timeout = jiffies;
4480
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
4481
	}
4482 4483
	rcu_read_unlock();

4484
	run_again(sdata, assoc_data->timeout);
J
Johannes Berg 已提交
4485

P
Paul Stewart 已提交
4486 4487 4488 4489 4490 4491 4492 4493 4494 4495
	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
4496 4497
		sdata_info(sdata, "associating with AP with corrupt %s\n",
			   corrupt_type);
P
Paul Stewart 已提交
4498 4499
	}

4500
	return 0;
J
Johannes Berg 已提交
4501
 err_clear:
4502 4503
	memset(ifmgd->bssid, 0, ETH_ALEN);
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4504 4505 4506 4507
	ifmgd->assoc_data = NULL;
 err_free:
	kfree(assoc_data);
	return err;
4508 4509
}

4510
int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4511
			 struct cfg80211_deauth_request *req)
4512
{
4513
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4514
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4515
	bool tx = !req->local_state_change;
4516

4517 4518 4519 4520 4521 4522
	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));
4523

4524
		drv_mgd_prepare_tx(sdata->local, sdata);
4525 4526
		ieee80211_send_deauth_disassoc(sdata, req->bssid,
					       IEEE80211_STYPE_DEAUTH,
4527
					       req->reason_code, tx,
4528
					       frame_buf);
4529
		ieee80211_destroy_auth_data(sdata, false);
4530 4531
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
4532

4533
		return 0;
4534 4535
	}

4536 4537
	if (ifmgd->associated &&
	    ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4538 4539 4540 4541 4542
		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));

4543 4544
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       req->reason_code, tx, frame_buf);
4545 4546
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
4547 4548
		return 0;
	}
4549

4550
	return -ENOTCONN;
4551
}
4552

4553
int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4554
			   struct cfg80211_disassoc_request *req)
J
Johannes Berg 已提交
4555
{
4556
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4557
	u8 bssid[ETH_ALEN];
4558
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
J
Johannes Berg 已提交
4559

J
Johannes Berg 已提交
4560 4561 4562 4563 4564 4565
	/*
	 * 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.
	 */
4566
	if (ifmgd->associated != req->bss)
4567 4568
		return -ENOLINK;

J
Johannes Berg 已提交
4569
	sdata_info(sdata,
4570 4571
		   "disassociating from %pM by local choice (Reason: %u=%s)\n",
		   req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4572

4573
	memcpy(bssid, req->bss->bssid, ETH_ALEN);
4574 4575 4576
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
			       req->reason_code, !req->local_state_change,
			       frame_buf);
4577

4578 4579
	cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
			      IEEE80211_DEAUTH_FRAME_LEN);
4580

4581 4582
	return 0;
}
4583

4584
void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4585 4586 4587
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

4588 4589 4590 4591 4592 4593 4594 4595 4596 4597
	/*
	 * 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);
4598
	cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4599

4600
	sdata_lock(sdata);
4601 4602
	if (ifmgd->assoc_data) {
		struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4603
		ieee80211_destroy_assoc_data(sdata, false);
4604 4605
		cfg80211_assoc_timeout(sdata->dev, bss);
	}
4606 4607 4608
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
	del_timer_sync(&ifmgd->timer);
4609
	sdata_unlock(sdata);
4610 4611
}

4612 4613 4614 4615 4616 4617
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
4618 4619
	trace_api_cqm_rssi_notify(sdata, rssi_event);

4620 4621 4622
	cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
}
EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);