mlme.c 163.9 KB
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// SPDX-License-Identifier: GPL-2.0-only
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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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 * Copyright (C) 2015 - 2017 Intel Deutschland GmbH
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 * Copyright (C) 2018 - 2019 Intel Corporation
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 */

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#include <linux/delay.h>
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#include <linux/fips.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/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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#include "fils_aead.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)
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#define IEEE80211_AUTH_TIMEOUT_SAE	(HZ * 2)
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#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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/*
 * How many Beacon frames need to have been used in average signal strength
 * before starting to indicate signal change events.
 */
#define IEEE80211_SIGNAL_AVE_MIN_COUNT	4

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

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

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	if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
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		return;

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

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

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	if (unlikely(!ifmgd->associated))
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		return;

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	if (ifmgd->probe_send_count)
		ifmgd->probe_send_count = 0;
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	if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
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		return;

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	mod_timer(&ifmgd->conn_mon_timer,
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		  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,
			     const struct ieee80211_ht_operation *ht_oper,
			     const struct ieee80211_vht_operation *vht_oper,
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			     const struct ieee80211_he_operation *he_oper,
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			     struct cfg80211_chan_def *chandef, bool tracking)
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{
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	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
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	struct cfg80211_chan_def vht_chandef;
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	struct ieee80211_sta_ht_cap sta_ht_cap;
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	u32 ht_cfreq, ret;

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

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	memset(chandef, 0, sizeof(struct cfg80211_chan_def));
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	chandef->chan = channel;
	chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
	chandef->center_freq1 = channel->center_freq;

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	if (!ht_oper || !sta_ht_cap.ht_supported) {
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		ret = IEEE80211_STA_DISABLE_HT |
		      IEEE80211_STA_DISABLE_VHT |
		      IEEE80211_STA_DISABLE_HE;
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		goto out;
	}

	chandef->width = NL80211_CHAN_WIDTH_20;

	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 |
		      IEEE80211_STA_DISABLE_HE;
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		goto out;
	}

	/* check 40 MHz support, if we have it */
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	if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
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		ieee80211_chandef_ht_oper(ht_oper, chandef);
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	} 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;
	}

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	vht_chandef = *chandef;
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	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HE) && he_oper &&
	    (le32_to_cpu(he_oper->he_oper_params) &
	     IEEE80211_HE_OPERATION_VHT_OPER_INFO)) {
		struct ieee80211_vht_operation he_oper_vht_cap;

		/*
		 * Set only first 3 bytes (other 2 aren't used in
		 * ieee80211_chandef_vht_oper() anyway)
		 */
		memcpy(&he_oper_vht_cap, he_oper->optional, 3);
		he_oper_vht_cap.basic_mcs_set = cpu_to_le16(0);

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		if (!ieee80211_chandef_vht_oper(&sdata->local->hw,
						&he_oper_vht_cap, ht_oper,
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						&vht_chandef)) {
			if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HE))
				sdata_info(sdata,
					   "HE AP VHT information is invalid, disable HE\n");
			ret = IEEE80211_STA_DISABLE_HE;
			goto out;
		}
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	} else if (!ieee80211_chandef_vht_oper(&sdata->local->hw, vht_oper,
					       ht_oper, &vht_chandef)) {
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		if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
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			sdata_info(sdata,
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				   "AP VHT information is invalid, disable VHT\n");
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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 |
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			      IEEE80211_STA_DISABLE_VHT |
			      IEEE80211_STA_DISABLE_HE;
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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,
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			       const struct ieee80211_he_operation *he_oper,
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			       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_channel *chan = sdata->vif.bss_conf.chandef.chan;
	struct ieee80211_supported_band *sband =
		local->hw.wiphy->bands[chan->band];
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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;

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	/* don't check HE if we associated as non-HE station */
	if (ifmgd->flags & IEEE80211_STA_DISABLE_HE ||
	    !ieee80211_get_he_sta_cap(sband))
		he_oper = NULL;

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	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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	/* calculate new channel (type) based on HT/VHT/HE operation IEs */
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	flags = ieee80211_determine_chantype(sdata, sband, chan,
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					     ht_oper, vht_oper, he_oper,
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					     &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 |
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				      IEEE80211_STA_DISABLE_HE |
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				      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);
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		/* fall through */
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	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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/* This function determines vht capability flags for the association
 * and builds the IE.
 * Note - the function may set the owner of the MU-MIMO capability
 */
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static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
				 struct sk_buff *skb,
535 536
				 struct ieee80211_supported_band *sband,
				 struct ieee80211_vht_cap *ap_vht_cap)
537
{
538
	struct ieee80211_local *local = sdata->local;
539 540 541
	u8 *pos;
	u32 cap;
	struct ieee80211_sta_vht_cap vht_cap;
542
	u32 mask, ap_bf_sts, our_bf_sts;
543 544 545 546

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

	memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
547
	ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
548 549 550 551

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

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	if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
553 554 555 556 557 558
		u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;

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

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

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	/*
	 * 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)))
572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589
		cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
			 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
	else if (!(ap_vht_cap->vht_cap_info &
			cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
		cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;

	/*
	 * If some other vif is using the MU-MIMO capablity we cannot associate
	 * using MU-MIMO - this will lead to contradictions in the group-id
	 * mechanism.
	 * Ownership is defined since association request, in order to avoid
	 * simultaneous associations with MU-MIMO.
	 */
	if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
		bool disable_mu_mimo = false;
		struct ieee80211_sub_if_data *other;

		list_for_each_entry_rcu(other, &local->interfaces, list) {
590
			if (other->vif.mu_mimo_owner) {
591 592 593 594 595 596 597
				disable_mu_mimo = true;
				break;
			}
		}
		if (disable_mu_mimo)
			cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
		else
598
			sdata->vif.mu_mimo_owner = true;
599
	}
600

601 602 603 604 605 606 607 608 609 610
	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;
	}

611
	/* reserve and fill IE */
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	pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
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	ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
}

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/* This function determines HE capability flags for the association
 * and builds the IE.
 */
static void ieee80211_add_he_ie(struct ieee80211_sub_if_data *sdata,
				struct sk_buff *skb,
				struct ieee80211_supported_band *sband)
{
	u8 *pos;
	const struct ieee80211_sta_he_cap *he_cap = NULL;
	u8 he_cap_size;

	he_cap = ieee80211_get_he_sta_cap(sband);
	if (!he_cap)
		return;

	/*
	 * TODO: the 1 added is because this temporarily is under the EXTENSION
	 * IE. Get rid of it when it moves.
	 */
	he_cap_size =
		2 + 1 + sizeof(he_cap->he_cap_elem) +
		ieee80211_he_mcs_nss_size(&he_cap->he_cap_elem) +
		ieee80211_he_ppe_size(he_cap->ppe_thres[0],
				      he_cap->he_cap_elem.phy_cap_info);
	pos = skb_put(skb, he_cap_size);
	ieee80211_ie_build_he_cap(pos, he_cap, pos + he_cap_size);
}

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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;
651
	u8 *pos, qos_info, *ie_start;
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	size_t offset = 0, noffset;
653
	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;
658
	u32 rates = 0;
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660
	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;
	}
668
	chan = chanctx_conf->def.chan;
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	rcu_read_unlock();
	sband = local->hw.wiphy->bands[chan->band];
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	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)...
		 */
680 681 682 683
		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.
		 */
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		rates_len = 0;
		for (i = 0; i < sband->n_bitrates; i++) {
			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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			2 + 1 + sizeof(struct ieee80211_he_cap_elem) + /* HE */
				sizeof(struct ieee80211_he_mcs_nss_supp) +
				IEEE80211_HE_PPE_THRES_MAX_LEN +
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			assoc_data->ie_len + /* extra IEs */
709
			(assoc_data->fils_kek_len ? 16 /* AES-SIV */ : 0) +
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			9, /* WMM */
			GFP_KERNEL);
	if (!skb)
		return;

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

	capab = WLAN_CAPABILITY_ESS;

719
	if (sband->band == NL80211_BAND_2GHZ) {
720 721
		capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
		capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
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	}

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

	if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
728
	    ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
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		capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;

731 732 733
	if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
		capab |= WLAN_CAPABILITY_RADIO_MEASURE;

734
	mgmt = skb_put_zero(skb, 24);
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	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);
759
	ie_start = pos;
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	*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) {
776 777 778
			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) {
791 792 793 794
				int rate;
				rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
						    5 * (1 << shift));
				*pos++ = (u8) rate;
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			}
		}
	}

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	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 */
805 806
		 /* max tx power */
		*pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
807
	}
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809
	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*/
		}
	}

821 822 823 824 825 826 827 828 829 830 831 832 833 834 835
	/* Set MBSSID support for HE AP if needed */
	if (ieee80211_hw_check(&local->hw, SUPPORTS_ONLY_HE_MULTI_BSSID) &&
	    !(ifmgd->flags & IEEE80211_STA_DISABLE_HE) && assoc_data->ie_len) {
		struct element *elem;

		/* we know it's writable, cast away the const */
		elem = (void *)cfg80211_find_elem(WLAN_EID_EXT_CAPABILITY,
						  assoc_data->ie,
						  assoc_data->ie_len);

		/* We can probably assume both always true */
		if (elem && elem->datalen >= 3)
			elem->data[2] |= WLAN_EXT_CAPA3_MULTI_BSSID_SUPPORT;
	}

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	/* if present, add any custom IEs that go before HT */
837
	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,
848 849
			WLAN_EID_FAST_BSS_TRANSITION,	/* reassoc only */
			WLAN_EID_RIC_DATA,		/* reassoc only */
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			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
		};
852 853 854 855
		static const u8 after_ric[] = {
			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
			WLAN_EID_HT_CAPABILITY,
			WLAN_EID_BSS_COEX_2040,
856
			/* luckily this is almost always there */
857 858 859 860
			WLAN_EID_EXT_CAPABILITY,
			WLAN_EID_QOS_TRAFFIC_CAPA,
			WLAN_EID_TIM_BCAST_REQ,
			WLAN_EID_INTERWORKING,
861
			/* 60 GHz (Multi-band, DMG, MMS) can't happen */
862 863 864 865 866 867 868 869 870 871 872
			WLAN_EID_VHT_CAPABILITY,
			WLAN_EID_OPMODE_NOTIF,
		};

		noffset = ieee80211_ie_split_ric(assoc_data->ie,
						 assoc_data->ie_len,
						 before_ht,
						 ARRAY_SIZE(before_ht),
						 after_ric,
						 ARRAY_SIZE(after_ric),
						 offset);
873
		skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
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		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;

881
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
882
		ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
883
				    sband, chan, sdata->smps_mode);
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885 886 887
	/* if present, add any custom IEs that go before VHT */
	if (assoc_data->ie_len) {
		static const u8 before_vht[] = {
888 889 890 891
			/*
			 * no need to list the ones split off before HT
			 * or generated here
			 */
892 893 894 895 896
			WLAN_EID_BSS_COEX_2040,
			WLAN_EID_EXT_CAPABILITY,
			WLAN_EID_QOS_TRAFFIC_CAPA,
			WLAN_EID_TIM_BCAST_REQ,
			WLAN_EID_INTERWORKING,
897
			/* 60 GHz (Multi-band, DMG, MMS) can't happen */
898
		};
899 900

		/* RIC already taken above, so no need to handle here anymore */
901 902 903
		noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
					     before_vht, ARRAY_SIZE(before_vht),
					     offset);
904
		skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
905 906 907
		offset = noffset;
	}

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	/* if present, add any custom IEs that go before HE */
	if (assoc_data->ie_len) {
		static const u8 before_he[] = {
			/*
			 * no need to list the ones split off before VHT
			 * or generated here
			 */
			WLAN_EID_OPMODE_NOTIF,
			WLAN_EID_EXTENSION, WLAN_EID_EXT_FUTURE_CHAN_GUIDANCE,
			/* 11ai elements */
			WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_SESSION,
			WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_PUBLIC_KEY,
			WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_KEY_CONFIRM,
			WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_HLP_CONTAINER,
			WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_IP_ADDR_ASSIGN,
			/* TODO: add 11ah/11aj/11ak elements */
		};

		/* RIC already taken above, so no need to handle here anymore */
		noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
					     before_he, ARRAY_SIZE(before_he),
					     offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
		offset = noffset;
	}

935
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
936 937
		ieee80211_add_vht_ie(sdata, skb, sband,
				     &assoc_data->ap_vht_cap);
938

939 940 941 942 943 944 945 946 947
	/*
	 * If AP doesn't support HT, mark HE as disabled.
	 * If on the 5GHz band, make sure it supports VHT.
	 */
	if (ifmgd->flags & IEEE80211_STA_DISABLE_HT ||
	    (sband->band == NL80211_BAND_5GHZ &&
	     ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
		ifmgd->flags |= IEEE80211_STA_DISABLE_HE;

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	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HE))
		ieee80211_add_he_ie(sdata, skb, sband);

	/* if present, add any custom non-vendor IEs that go after HE */
952
	if (assoc_data->ie_len) {
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		noffset = ieee80211_ie_split_vendor(assoc_data->ie,
						    assoc_data->ie_len,
						    offset);
956
		skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
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		offset = noffset;
	}

960 961
	if (assoc_data->wmm) {
		if (assoc_data->uapsd) {
962 963
			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;
		}

969
		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 */
973
	if (assoc_data->ie_len) {
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		noffset = assoc_data->ie_len;
975
		skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
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	}

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	if (assoc_data->fils_kek_len &&
	    fils_encrypt_assoc_req(skb, assoc_data) < 0) {
		dev_kfree_skb(skb);
		return;
	}

984 985 986 987 988
	pos = skb_tail_pointer(skb);
	kfree(ifmgd->assoc_req_ies);
	ifmgd->assoc_req_ies = kmemdup(ie_start, pos - ie_start, GFP_ATOMIC);
	ifmgd->assoc_req_ies_len = pos - ie_start;

989
	drv_mgd_prepare_tx(local, sdata, 0);
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	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
992
	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
993 994
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
						IEEE80211_TX_INTFL_MLME_CONN_TX;
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995 996 997
	ieee80211_tx_skb(sdata, skb);
}

998 999 1000 1001 1002 1003
void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_pspoll *pspoll;
	struct sk_buff *skb;

1004 1005
	skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
	if (!skb)
1006 1007
		return;

1008 1009
	pspoll = (struct ieee80211_pspoll *) skb->data;
	pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
1010

1011 1012
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
1013 1014
}

1015 1016
void ieee80211_send_nullfunc(struct ieee80211_local *local,
			     struct ieee80211_sub_if_data *sdata,
1017
			     bool powersave)
1018 1019
{
	struct sk_buff *skb;
1020
	struct ieee80211_hdr_3addr *nullfunc;
1021
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1022

L
Luca Coelho 已提交
1023 1024 1025 1026 1027
	/* Don't send NDPs when STA is connected HE */
	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
	    !(ifmgd->flags & IEEE80211_STA_DISABLE_HE))
		return;

1028 1029
	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif,
		!ieee80211_hw_check(&local->hw, DOESNT_SUPPORT_QOS_NDP));
1030
	if (!skb)
1031 1032
		return;

1033
	nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
1034
	if (powersave)
1035
		nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
1036

1037 1038
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
					IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
1039

1040
	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1041 1042
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;

1043
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
1044 1045
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;

1046
	ieee80211_tx_skb(sdata, skb);
1047 1048
}

1049 1050 1051 1052 1053 1054 1055 1056 1057 1058
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;

L
Luca Coelho 已提交
1059 1060 1061 1062
	/* Don't send NDPs when connected HE */
	if (!(sdata->u.mgd.flags & IEEE80211_STA_DISABLE_HE))
		return;

1063
	skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
1064
	if (!skb)
1065
		return;
1066

1067 1068
	skb_reserve(skb, local->hw.extra_tx_headroom);

1069
	nullfunc = skb_put_zero(skb, 30);
1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081
	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);
}

1082 1083 1084 1085 1086
/* 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);
1087
	struct ieee80211_local *local = sdata->local;
1088
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1089
	int ret;
1090

1091
	if (!ieee80211_sdata_running(sdata))
1092 1093
		return;

1094
	sdata_lock(sdata);
1095 1096 1097
	mutex_lock(&local->mtx);
	mutex_lock(&local->chanctx_mtx);

1098 1099
	if (!ifmgd->associated)
		goto out;
1100

1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111
	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) {
1112 1113 1114 1115
		struct ieee80211_supported_band *sband = NULL;
		struct sta_info *mgd_sta = NULL;
		enum ieee80211_sta_rx_bandwidth bw = IEEE80211_STA_RX_BW_20;

1116 1117 1118 1119 1120 1121 1122 1123
		/*
		 * 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;

1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165
		if (sdata->vif.bss_conf.chandef.width !=
		    sdata->csa_chandef.width) {
			/*
			 * For managed interface, we need to also update the AP
			 * station bandwidth and align the rate scale algorithm
			 * on the bandwidth change. Here we only consider the
			 * bandwidth of the new channel definition (as channel
			 * switch flow does not have the full HT/VHT/HE
			 * information), assuming that if additional changes are
			 * required they would be done as part of the processing
			 * of the next beacon from the AP.
			 */
			switch (sdata->csa_chandef.width) {
			case NL80211_CHAN_WIDTH_20_NOHT:
			case NL80211_CHAN_WIDTH_20:
			default:
				bw = IEEE80211_STA_RX_BW_20;
				break;
			case NL80211_CHAN_WIDTH_40:
				bw = IEEE80211_STA_RX_BW_40;
				break;
			case NL80211_CHAN_WIDTH_80:
				bw = IEEE80211_STA_RX_BW_80;
				break;
			case NL80211_CHAN_WIDTH_80P80:
			case NL80211_CHAN_WIDTH_160:
				bw = IEEE80211_STA_RX_BW_160;
				break;
			}

			mgd_sta = sta_info_get(sdata, ifmgd->bssid);
			sband =
				local->hw.wiphy->bands[sdata->csa_chandef.chan->band];
		}

		if (sdata->vif.bss_conf.chandef.width >
		    sdata->csa_chandef.width) {
			mgd_sta->sta.bandwidth = bw;
			rate_control_rate_update(local, sband, mgd_sta,
						 IEEE80211_RC_BW_CHANGED);
		}

1166 1167 1168 1169 1170 1171 1172 1173 1174 1175
		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;
		}

1176 1177 1178 1179 1180 1181 1182
		if (sdata->vif.bss_conf.chandef.width <
		    sdata->csa_chandef.width) {
			mgd_sta->sta.bandwidth = bw;
			rate_control_rate_update(local, sband, mgd_sta,
						 IEEE80211_RC_BW_CHANGED);
		}

1183 1184 1185 1186 1187
		goto out;
	}

	if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
					&sdata->csa_chandef)) {
1188
		sdata_info(sdata,
1189
			   "failed to finalize channel switch, disconnecting\n");
1190 1191 1192 1193
		ieee80211_queue_work(&sdata->local->hw,
				     &ifmgd->csa_connection_drop_work);
		goto out;
	}
1194

1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214
	ifmgd->csa_waiting_bcn = true;

	ieee80211_sta_reset_beacon_monitor(sdata);
	ieee80211_sta_reset_conn_monitor(sdata);

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

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

	sdata_assert_lock(sdata);

	WARN_ON(!sdata->vif.csa_active);
1215

1216 1217 1218 1219 1220
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
1221

1222 1223 1224
	sdata->vif.csa_active = false;
	ifmgd->csa_waiting_bcn = false;

1225 1226 1227 1228 1229 1230
	ret = drv_post_channel_switch(sdata);
	if (ret) {
		sdata_info(sdata,
			   "driver post channel switch failed, disconnecting\n");
		ieee80211_queue_work(&local->hw,
				     &ifmgd->csa_connection_drop_work);
1231
		return;
1232
	}
1233 1234

	cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1235 1236
}

1237 1238
void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
{
J
Johannes Berg 已提交
1239 1240
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1241 1242 1243

	trace_api_chswitch_done(sdata, success);
	if (!success) {
1244 1245 1246 1247 1248 1249
		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);
1250 1251 1252 1253
	}
}
EXPORT_SYMBOL(ieee80211_chswitch_done);

1254
static void ieee80211_chswitch_timer(struct timer_list *t)
1255 1256
{
	struct ieee80211_sub_if_data *sdata =
1257
		from_timer(sdata, t, u.mgd.chswitch_timer);
1258

1259
	ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1260 1261
}

1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287
static void
ieee80211_sta_abort_chanswitch(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;

	if (!local->ops->abort_channel_switch)
		return;

	mutex_lock(&local->mtx);

	mutex_lock(&local->chanctx_mtx);
	ieee80211_vif_unreserve_chanctx(sdata);
	mutex_unlock(&local->chanctx_mtx);

	if (sdata->csa_block_tx)
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);

	sdata->csa_block_tx = false;
	sdata->vif.csa_active = false;

	mutex_unlock(&local->mtx);

	drv_abort_channel_switch(sdata);
}

1288
static void
J
Johannes Berg 已提交
1289
ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1290 1291
				 u64 timestamp, u32 device_timestamp,
				 struct ieee802_11_elems *elems,
1292
				 bool beacon)
1293
{
1294
	struct ieee80211_local *local = sdata->local;
1295
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1296
	struct cfg80211_bss *cbss = ifmgd->associated;
1297
	struct ieee80211_chanctx_conf *conf;
J
Johannes Berg 已提交
1298
	struct ieee80211_chanctx *chanctx;
1299
	enum nl80211_band current_band;
1300
	struct ieee80211_csa_ie csa_ie;
1301
	struct ieee80211_channel_switch ch_switch;
1302
	int res;
1303

1304
	sdata_assert_lock(sdata);
1305

1306
	if (!cbss)
1307 1308
		return;

1309
	if (local->scanning)
1310 1311
		return;

1312
	current_band = cbss->channel->band;
1313
	res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1314
					   ifmgd->flags,
1315
					   ifmgd->associated->bssid, &csa_ie);
1316 1317 1318 1319

	if (!res) {
		ch_switch.timestamp = timestamp;
		ch_switch.device_timestamp = device_timestamp;
1320
		ch_switch.block_tx =  beacon ? csa_ie.mode : 0;
1321 1322 1323 1324 1325
		ch_switch.chandef = csa_ie.chandef;
		ch_switch.count = csa_ie.count;
		ch_switch.delay = csa_ie.max_switch_time;
	}

1326
	if (res < 0) {
1327
		ieee80211_queue_work(&local->hw,
1328
				     &ifmgd->csa_connection_drop_work);
1329
		return;
1330 1331
	}

1332 1333 1334 1335 1336
	if (beacon && sdata->vif.csa_active && !ifmgd->csa_waiting_bcn) {
		if (res)
			ieee80211_sta_abort_chanswitch(sdata);
		else
			drv_channel_switch_rx_beacon(sdata, &ch_switch);
1337 1338 1339 1340 1341
		return;
	} else if (sdata->vif.csa_active || res) {
		/* disregard subsequent announcements if already processing */
		return;
	}
1342

1343
	if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1344 1345 1346
				     IEEE80211_CHAN_DISABLED)) {
		sdata_info(sdata,
			   "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1347
			   ifmgd->associated->bssid,
1348 1349 1350
			   csa_ie.chandef.chan->center_freq,
			   csa_ie.chandef.width, csa_ie.chandef.center_freq1,
			   csa_ie.chandef.center_freq2);
1351 1352 1353 1354 1355
		ieee80211_queue_work(&local->hw,
				     &ifmgd->csa_connection_drop_work);
		return;
	}

1356
	if (cfg80211_chandef_identical(&csa_ie.chandef,
1357 1358
				       &sdata->vif.bss_conf.chandef) &&
	    (!csa_ie.mode || !beacon)) {
1359 1360 1361 1362 1363 1364 1365 1366 1367
		if (ifmgd->csa_ignored_same_chan)
			return;
		sdata_info(sdata,
			   "AP %pM tries to chanswitch to same channel, ignore\n",
			   ifmgd->associated->bssid);
		ifmgd->csa_ignored_same_chan = true;
		return;
	}

1368 1369 1370 1371 1372 1373 1374 1375
	/*
	 * Drop all TDLS peers - either we disconnect or move to a different
	 * channel from this point on. There's no telling what our peer will do.
	 * The TDLS WIDER_BW scenario is also problematic, as peers might now
	 * have an incompatible wider chandef.
	 */
	ieee80211_teardown_tdls_peers(sdata);

1376
	mutex_lock(&local->mtx);
1377
	mutex_lock(&local->chanctx_mtx);
1378 1379 1380 1381 1382
	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");
1383
		goto drop_connection;
1384 1385 1386 1387
	}

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

1388
	if (local->use_chanctx &&
1389
	    !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1390 1391
		sdata_info(sdata,
			   "driver doesn't support chan-switch with channel contexts\n");
1392
		goto drop_connection;
J
Johannes Berg 已提交
1393 1394
	}

1395 1396 1397
	if (drv_pre_channel_switch(sdata, &ch_switch)) {
		sdata_info(sdata,
			   "preparing for channel switch failed, disconnecting\n");
1398
		goto drop_connection;
1399 1400
	}

1401 1402 1403
	res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
					    chanctx->mode, false);
	if (res) {
J
Johannes Berg 已提交
1404
		sdata_info(sdata,
1405 1406
			   "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
			   res);
1407
		goto drop_connection;
J
Johannes Berg 已提交
1408
	}
1409
	mutex_unlock(&local->chanctx_mtx);
J
Johannes Berg 已提交
1410

1411
	sdata->vif.csa_active = true;
1412
	sdata->csa_chandef = csa_ie.chandef;
1413
	sdata->csa_block_tx = ch_switch.block_tx;
1414
	ifmgd->csa_ignored_same_chan = false;
J
Johannes Berg 已提交
1415

1416
	if (sdata->csa_block_tx)
1417 1418
		ieee80211_stop_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
1419
	mutex_unlock(&local->mtx);
1420

1421 1422 1423
	cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
					  csa_ie.count);

1424
	if (local->ops->channel_switch) {
1425
		/* use driver's channel switch callback */
1426
		drv_channel_switch(local, sdata, &ch_switch);
1427 1428 1429 1430
		return;
	}

	/* channel switch handled in software */
1431
	if (csa_ie.count <= 1)
1432
		ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1433
	else
1434
		mod_timer(&ifmgd->chswitch_timer,
1435 1436
			  TU_TO_EXP_TIME((csa_ie.count - 1) *
					 cbss->beacon_interval));
1437 1438
	return;
 drop_connection:
1439 1440 1441 1442 1443 1444 1445 1446
	/*
	 * This is just so that the disconnect flow will know that
	 * we were trying to switch channel and failed. In case the
	 * mode is 1 (we are not allowed to Tx), we will know not to
	 * send a deauthentication frame. Those two fields will be
	 * reset when the disconnection worker runs.
	 */
	sdata->vif.csa_active = true;
1447
	sdata->csa_block_tx = ch_switch.block_tx;
1448

1449 1450 1451
	ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
	mutex_unlock(&local->chanctx_mtx);
	mutex_unlock(&local->mtx);
1452 1453
}

1454 1455 1456 1457 1458 1459
static bool
ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
				 struct ieee80211_channel *channel,
				 const u8 *country_ie, u8 country_ie_len,
				 const u8 *pwr_constr_elem,
				 int *chan_pwr, int *pwr_reduction)
1460
{
1461 1462
	struct ieee80211_country_ie_triplet *triplet;
	int chan = ieee80211_frequency_to_channel(channel->center_freq);
1463
	int i, chan_increment;
1464
	bool have_chan_pwr = false;
1465

1466 1467
	/* Invalid IE */
	if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1468
		return false;
1469

1470 1471 1472 1473 1474 1475 1476
	triplet = (void *)(country_ie + 3);
	country_ie_len -= 3;

	switch (channel->band) {
	default:
		WARN_ON_ONCE(1);
		/* fall through */
1477 1478
	case NL80211_BAND_2GHZ:
	case NL80211_BAND_60GHZ:
1479 1480
		chan_increment = 1;
		break;
1481
	case NL80211_BAND_5GHZ:
1482 1483
		chan_increment = 4;
		break;
1484
	}
1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495

	/* 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;
1496
				*chan_pwr = triplet->chans.max_power;
1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507
				break;
			}
		}
		if (have_chan_pwr)
			break;

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

1508
	if (have_chan_pwr && pwr_constr_elem)
1509
		*pwr_reduction = *pwr_constr_elem;
1510 1511 1512
	else
		*pwr_reduction = 0;

1513 1514 1515
	return have_chan_pwr;
}

1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529
static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
				      struct ieee80211_channel *channel,
				      const u8 *cisco_dtpc_ie,
				      int *pwr_level)
{
	/* From practical testing, the first data byte of the DTPC element
	 * seems to contain the requested dBm level, and the CLI on Cisco
	 * APs clearly state the range is -127 to 127 dBm, which indicates
	 * a signed byte, although it seemingly never actually goes negative.
	 * The other byte seems to always be zero.
	 */
	*pwr_level = (__s8)cisco_dtpc_ie[4];
}

1530 1531 1532 1533
static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_channel *channel,
				       struct ieee80211_mgmt *mgmt,
				       const u8 *country_ie, u8 country_ie_len,
1534 1535
				       const u8 *pwr_constr_ie,
				       const u8 *cisco_dtpc_ie)
1536
{
1537 1538 1539
	bool has_80211h_pwr = false, has_cisco_pwr = false;
	int chan_pwr = 0, pwr_reduction_80211h = 0;
	int pwr_level_cisco, pwr_level_80211h;
1540
	int new_ap_level;
1541
	__le16 capab = mgmt->u.probe_resp.capab_info;
1542

1543 1544 1545
	if (country_ie &&
	    (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
	     capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1546 1547 1548
		has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
			sdata, channel, country_ie, country_ie_len,
			pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1549 1550 1551 1552 1553 1554 1555 1556
		pwr_level_80211h =
			max_t(int, 0, chan_pwr - pwr_reduction_80211h);
	}

	if (cisco_dtpc_ie) {
		ieee80211_find_cisco_dtpc(
			sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
		has_cisco_pwr = true;
1557
	}
1558

1559
	if (!has_80211h_pwr && !has_cisco_pwr)
1560
		return 0;
1561

1562 1563 1564 1565 1566
	/* If we have both 802.11h and Cisco DTPC, apply both limits
	 * by picking the smallest of the two power levels advertised.
	 */
	if (has_80211h_pwr &&
	    (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1567 1568 1569 1570 1571
		new_ap_level = pwr_level_80211h;

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

1572 1573 1574 1575
		sdata_dbg(sdata,
			  "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
			  pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
			  sdata->u.mgd.bssid);
1576
	} else {  /* has_cisco_pwr is always true here. */
1577 1578 1579 1580 1581
		new_ap_level = pwr_level_cisco;

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

1582 1583 1584
		sdata_dbg(sdata,
			  "Limiting TX power to %d dBm as advertised by %pM\n",
			  pwr_level_cisco, sdata->u.mgd.bssid);
1585
	}
1586

1587 1588 1589 1590
	sdata->ap_power_level = new_ap_level;
	if (__ieee80211_recalc_txpower(sdata))
		return BSS_CHANGED_TXPOWER;
	return 0;
1591 1592
}

1593 1594 1595 1596 1597 1598
/* 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
1599 1600 1601 1602
	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
1603
	if (local->scanning)
J
Johannes Berg 已提交
1604 1605
		return;

1606
	if (conf->dynamic_ps_timeout > 0 &&
1607
	    !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1608 1609 1610
		mod_timer(&local->dynamic_ps_timer, jiffies +
			  msecs_to_jiffies(conf->dynamic_ps_timeout));
	} else {
1611
		if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1612
			ieee80211_send_nullfunc(local, sdata, true);
1613

1614 1615
		if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
		    ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1616 1617 1618 1619
			return;

		conf->flags |= IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636
	}
}

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);
	}
}

1637 1638 1639 1640
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
1641
	bool authorized = false;
1642 1643 1644 1645

	if (!mgd->powersave)
		return false;

1646 1647 1648
	if (mgd->broken_ap)
		return false;

1649 1650 1651
	if (!mgd->associated)
		return false;

1652
	if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1653 1654
		return false;

1655
	if (!mgd->have_beacon)
1656 1657
		return false;

1658 1659 1660
	rcu_read_lock();
	sta = sta_info_get(sdata, mgd->bssid);
	if (sta)
J
Johannes Berg 已提交
1661
		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1662 1663
	rcu_read_unlock();

J
Johannes Berg 已提交
1664
	return authorized;
1665 1666
}

1667
/* need to hold RTNL or interface lock */
J
Johannes Berg 已提交
1668
void ieee80211_recalc_ps(struct ieee80211_local *local)
1669 1670 1671
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;
1672
	int timeout;
1673

1674
	if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1675 1676 1677 1678 1679
		local->ps_sdata = NULL;
		return;
	}

	list_for_each_entry(sdata, &local->interfaces, list) {
1680
		if (!ieee80211_sdata_running(sdata))
1681
			continue;
1682 1683 1684 1685 1686 1687 1688 1689
		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;
		}
1690 1691 1692 1693 1694 1695
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

1696
	if (count == 1 && ieee80211_powersave_allowed(found)) {
J
Johannes Berg 已提交
1697
		u8 dtimper = found->u.mgd.dtim_period;
1698

1699
		timeout = local->dynamic_ps_forced_timeout;
J
Johannes Berg 已提交
1700 1701
		if (timeout < 0)
			timeout = 100;
1702
		local->hw.conf.dynamic_ps_timeout = timeout;
1703

J
Johannes Berg 已提交
1704 1705 1706 1707 1708 1709
		/* If the TIM IE is invalid, pretend the value is 1 */
		if (!dtimper)
			dtimper = 1;

		local->hw.conf.ps_dtim_period = dtimper;
		local->ps_sdata = found;
1710
	} else {
1711
		local->ps_sdata = NULL;
1712
	}
1713 1714 1715 1716

	ieee80211_change_ps(local);
}

E
Eliad Peller 已提交
1717 1718 1719 1720 1721 1722 1723 1724 1725 1726
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);
	}
}

1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738
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,
1739
					IEEE80211_MAX_QUEUE_MAP,
1740 1741
					IEEE80211_QUEUE_STOP_REASON_PS,
					false);
1742 1743 1744 1745 1746 1747 1748 1749
}

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;
1750
	struct ieee80211_if_managed *ifmgd;
1751 1752
	unsigned long flags;
	int q;
1753 1754 1755 1756 1757

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

1758 1759
	ifmgd = &sdata->u.mgd;

1760 1761 1762
	if (local->hw.conf.flags & IEEE80211_CONF_PS)
		return;

1763
	if (local->hw.conf.dynamic_ps_timeout > 0) {
1764 1765
		/* don't enter PS if TX frames are pending */
		if (drv_tx_frames_pending(local)) {
1766 1767 1768 1769 1770
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
			return;
		}
1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788

		/*
		 * 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);
1789 1790
	}

1791
	if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1792
	    !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1793
		if (drv_tx_frames_pending(local)) {
1794 1795 1796
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
1797
		} else {
1798
			ieee80211_send_nullfunc(local, sdata, true);
1799
			/* Flush to get the tx status of nullfunc frame */
1800
			ieee80211_flush_queues(local, sdata, false);
1801
		}
1802 1803
	}

1804 1805
	if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
	      ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1806 1807 1808 1809 1810
	    (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);
	}
1811 1812
}

1813
void ieee80211_dynamic_ps_timer(struct timer_list *t)
1814
{
1815
	struct ieee80211_local *local = from_timer(local, t, dynamic_ps_timer);
1816

1817
	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1818 1819
}

1820 1821
void ieee80211_dfs_cac_timer_work(struct work_struct *work)
{
1822
	struct delayed_work *delayed_work = to_delayed_work(work);
1823 1824 1825
	struct ieee80211_sub_if_data *sdata =
		container_of(delayed_work, struct ieee80211_sub_if_data,
			     dfs_cac_timer_work);
1826
	struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1827

1828 1829 1830 1831 1832 1833 1834 1835
	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);
1836 1837
}

1838 1839 1840 1841 1842
static bool
__ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1843
	bool ret = false;
1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887
	int ac;

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

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

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

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

		switch (tx_tspec->action) {
		case TX_TSPEC_ACTION_STOP_DOWNGRADE:
			/* take the original parameters */
			if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
				sdata_err(sdata,
					  "failed to set TX queue parameters for queue %d\n",
					  ac);
			tx_tspec->action = TX_TSPEC_ACTION_NONE;
			tx_tspec->downgraded = false;
			ret = true;
			break;
		case TX_TSPEC_ACTION_DOWNGRADE:
			if (time_after(now, tx_tspec->time_slice_start + HZ)) {
				tx_tspec->action = TX_TSPEC_ACTION_NONE;
				ret = true;
				break;
			}
			/* downgrade next lower non-ACM AC */
			for (non_acm_ac = ac + 1;
			     non_acm_ac < IEEE80211_NUM_ACS;
			     non_acm_ac++)
				if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
					break;
1888 1889 1890 1891 1892 1893
			/* Usually the loop will result in using BK even if it
			 * requires admission control, but such a configuration
			 * makes no sense and we have to transmit somehow - the
			 * AC selection does the same thing.
			 * If we started out trying to downgrade from BK, then
			 * the extra condition here might be needed.
1894
			 */
1895 1896
			if (non_acm_ac >= IEEE80211_NUM_ACS)
				non_acm_ac = IEEE80211_AC_BK;
1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930
			if (drv_conf_tx(local, sdata, ac,
					&sdata->tx_conf[non_acm_ac]))
				sdata_err(sdata,
					  "failed to set TX queue parameters for queue %d\n",
					  ac);
			tx_tspec->action = TX_TSPEC_ACTION_NONE;
			ret = true;
			schedule_delayed_work(&ifmgd->tx_tspec_wk,
				tx_tspec->time_slice_start + HZ - now + 1);
			break;
		case TX_TSPEC_ACTION_NONE:
			/* nothing now */
			break;
		}
	}

	return ret;
}

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

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

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

J
Johannes Berg 已提交
1931
/* MLME */
L
Luca Coelho 已提交
1932 1933 1934 1935 1936
static bool
ieee80211_sta_wmm_params(struct ieee80211_local *local,
			 struct ieee80211_sub_if_data *sdata,
			 const u8 *wmm_param, size_t wmm_param_len,
			 const struct ieee80211_mu_edca_param_set *mu_edca)
1937
{
1938
	struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1939
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1940
	size_t left;
1941
	int count, mu_edca_count, ac;
J
Johannes Berg 已提交
1942 1943
	const u8 *pos;
	u8 uapsd_queues = 0;
1944

1945
	if (!local->ops->conf_tx)
1946
		return false;
1947

J
Johannes Berg 已提交
1948
	if (local->hw.queues < IEEE80211_NUM_ACS)
1949
		return false;
1950 1951

	if (!wmm_param)
1952
		return false;
1953

1954
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1955
		return false;
K
Kalle Valo 已提交
1956 1957

	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1958
		uapsd_queues = ifmgd->uapsd_queues;
K
Kalle Valo 已提交
1959

1960
	count = wmm_param[6] & 0x0f;
1961 1962 1963 1964 1965 1966 1967
	/* -1 is the initial value of ifmgd->mu_edca_last_param_set.
	 * if mu_edca was preset before and now it disappeared tell
	 * the driver about it.
	 */
	mu_edca_count = mu_edca ? mu_edca->mu_qos_info & 0x0f : -1;
	if (count == ifmgd->wmm_last_param_set &&
	    mu_edca_count == ifmgd->mu_edca_last_param_set)
1968
		return false;
1969
	ifmgd->wmm_last_param_set = count;
1970
	ifmgd->mu_edca_last_param_set = mu_edca_count;
1971 1972 1973 1974 1975 1976

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

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

Y
Yoni Divinsky 已提交
1977
	sdata->wmm_acm = 0;
1978 1979 1980
	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
1981
		bool uapsd = false;
1982 1983

		switch (aci) {
1984
		case 1: /* AC_BK */
1985
			ac = IEEE80211_AC_BK;
J
Johannes Berg 已提交
1986
			if (acm)
Y
Yoni Divinsky 已提交
1987
				sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
K
Kalle Valo 已提交
1988 1989
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
				uapsd = true;
L
Luca Coelho 已提交
1990 1991 1992
			params[ac].mu_edca = !!mu_edca;
			if (mu_edca)
				params[ac].mu_edca_param_rec = mu_edca->ac_bk;
1993
			break;
1994
		case 2: /* AC_VI */
1995
			ac = IEEE80211_AC_VI;
J
Johannes Berg 已提交
1996
			if (acm)
Y
Yoni Divinsky 已提交
1997
				sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
K
Kalle Valo 已提交
1998 1999
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
				uapsd = true;
L
Luca Coelho 已提交
2000 2001 2002
			params[ac].mu_edca = !!mu_edca;
			if (mu_edca)
				params[ac].mu_edca_param_rec = mu_edca->ac_vi;
2003
			break;
2004
		case 3: /* AC_VO */
2005
			ac = IEEE80211_AC_VO;
J
Johannes Berg 已提交
2006
			if (acm)
Y
Yoni Divinsky 已提交
2007
				sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
K
Kalle Valo 已提交
2008 2009
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
				uapsd = true;
L
Luca Coelho 已提交
2010 2011 2012
			params[ac].mu_edca = !!mu_edca;
			if (mu_edca)
				params[ac].mu_edca_param_rec = mu_edca->ac_vo;
2013
			break;
2014
		case 0: /* AC_BE */
2015
		default:
2016
			ac = IEEE80211_AC_BE;
J
Johannes Berg 已提交
2017
			if (acm)
Y
Yoni Divinsky 已提交
2018
				sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
K
Kalle Valo 已提交
2019 2020
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
				uapsd = true;
L
Luca Coelho 已提交
2021 2022 2023
			params[ac].mu_edca = !!mu_edca;
			if (mu_edca)
				params[ac].mu_edca_param_rec = mu_edca->ac_be;
2024 2025 2026
			break;
		}

2027
		params[ac].aifs = pos[0] & 0x0f;
2028

2029
		if (params[ac].aifs < 2) {
2030 2031
			sdata_info(sdata,
				   "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
2032 2033
				   params[ac].aifs, aci);
			params[ac].aifs = 2;
2034
		}
2035 2036 2037 2038 2039
		params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
		params[ac].txop = get_unaligned_le16(pos + 2);
		params[ac].acm = acm;
		params[ac].uapsd = uapsd;
K
Kalle Valo 已提交
2040

2041
		if (params[ac].cw_min == 0 ||
2042
		    params[ac].cw_min > params[ac].cw_max) {
2043 2044 2045 2046 2047
			sdata_info(sdata,
				   "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
				   params[ac].cw_min, params[ac].cw_max, aci);
			return false;
		}
2048
		ieee80211_regulatory_limit_wmm_params(sdata, &params[ac], ac);
2049 2050
	}

2051 2052 2053 2054 2055 2056 2057 2058 2059 2060
	/* WMM specification requires all 4 ACIs. */
	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
		if (params[ac].cw_min == 0) {
			sdata_info(sdata,
				   "AP has invalid WMM params (missing AC %d), using defaults\n",
				   ac);
			return false;
		}
	}

2061
	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
J
Johannes Berg 已提交
2062
		mlme_dbg(sdata,
2063 2064 2065 2066 2067 2068 2069 2070
			 "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
			 ac, params[ac].acm,
			 params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
			 params[ac].txop, params[ac].uapsd,
			 ifmgd->tx_tspec[ac].downgraded);
		sdata->tx_conf[ac] = params[ac];
		if (!ifmgd->tx_tspec[ac].downgraded &&
		    drv_conf_tx(local, sdata, ac, &params[ac]))
J
Johannes Berg 已提交
2071
			sdata_err(sdata,
2072 2073
				  "failed to set TX queue parameters for AC %d\n",
				  ac);
2074
	}
2075 2076

	/* enable WMM or activate new settings */
2077
	sdata->vif.bss_conf.qos = true;
2078
	return true;
2079 2080
}

2081 2082 2083 2084
static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
{
	lockdep_assert_held(&sdata->local->mtx);

2085
	sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
2086 2087 2088 2089 2090 2091 2092 2093 2094 2095
	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
2096 2097
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
2098
{
J
Johannes Berg 已提交
2099
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2100
	struct ieee80211_supported_band *sband;
2101
	u32 changed = 0;
J
Johannes Berg 已提交
2102 2103 2104 2105
	bool use_protection;
	bool use_short_preamble;
	bool use_short_slot;

2106 2107 2108 2109
	sband = ieee80211_get_sband(sdata);
	if (!sband)
		return changed;

J
Johannes Berg 已提交
2110 2111 2112 2113 2114 2115 2116 2117 2118
	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);
2119
	if (sband->band == NL80211_BAND_5GHZ)
2120
		use_short_slot = true;
2121

2122 2123 2124
	if (use_protection != bss_conf->use_cts_prot) {
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
2125
	}
2126

2127 2128
	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
2129
		changed |= BSS_CHANGED_ERP_PREAMBLE;
2130
	}
2131

J
Johannes Berg 已提交
2132 2133 2134
	if (use_short_slot != bss_conf->use_short_slot) {
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
2135 2136 2137 2138 2139
	}

	return changed;
}

2140
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
2141
				     struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
2142
				     u32 bss_info_changed)
2143
{
2144
	struct ieee80211_bss *bss = (void *)cbss->priv;
2145
	struct ieee80211_local *local = sdata->local;
2146
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2147

J
Johannes Berg 已提交
2148
	bss_info_changed |= BSS_CHANGED_ASSOC;
2149
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
2150
		bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
2151

2152
	sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
2153
		beacon_loss_count * bss_conf->beacon_int));
2154

2155 2156
	sdata->u.mgd.associated = cbss;
	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
2157

2158 2159
	ieee80211_check_rate_mask(sdata);

2160 2161
	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;

2162 2163
	if (sdata->vif.p2p ||
	    sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
2164
		const struct cfg80211_bss_ies *ies;
2165

2166 2167 2168 2169 2170 2171 2172 2173
		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
2174 2175
					(u8 *) &bss_conf->p2p_noa_attr,
					sizeof(bss_conf->p2p_noa_attr));
2176
			if (ret >= 2) {
J
Janusz Dziedzic 已提交
2177 2178
				sdata->u.mgd.p2p_noa_index =
					bss_conf->p2p_noa_attr.index;
2179 2180
				bss_info_changed |= BSS_CHANGED_P2P_PS;
			}
2181
		}
2182
		rcu_read_unlock();
2183 2184
	}

J
Johannes Berg 已提交
2185
	/* just to be sure */
2186
	ieee80211_stop_poll(sdata);
J
Johannes Berg 已提交
2187

2188
	ieee80211_led_assoc(local, 1);
2189

2190
	if (sdata->u.mgd.have_beacon) {
2191 2192 2193 2194 2195 2196 2197
		/*
		 * 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;
2198
		bss_conf->beacon_rate = bss->beacon_rate;
2199
		bss_info_changed |= BSS_CHANGED_BEACON_INFO;
2200
	} else {
2201
		bss_conf->beacon_rate = NULL;
2202
		bss_conf->dtim_period = 0;
2203
	}
2204

2205
	bss_conf->assoc = 1;
2206

2207
	/* Tell the driver to monitor connection quality (if supported) */
2208
	if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
2209
	    bss_conf->cqm_rssi_thold)
2210 2211
		bss_info_changed |= BSS_CHANGED_CQM;

2212
	/* Enable ARP filtering */
2213
	if (bss_conf->arp_addr_cnt)
2214 2215
		bss_info_changed |= BSS_CHANGED_ARP_FILTER;

J
Johannes Berg 已提交
2216
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
2217

J
Johannes Berg 已提交
2218
	mutex_lock(&local->iflist_mtx);
J
Johannes Berg 已提交
2219
	ieee80211_recalc_ps(local);
J
Johannes Berg 已提交
2220
	mutex_unlock(&local->iflist_mtx);
2221

2222
	ieee80211_recalc_smps(sdata);
E
Eliad Peller 已提交
2223 2224
	ieee80211_recalc_ps_vif(sdata);

2225
	netif_carrier_on(sdata->dev);
2226 2227
}

2228
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
2229 2230
				   u16 stype, u16 reason, bool tx,
				   u8 *frame_buf)
2231
{
2232
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2233
	struct ieee80211_local *local = sdata->local;
2234
	u32 changed = 0;
2235

2236
	sdata_assert_lock(sdata);
2237

2238 2239 2240
	if (WARN_ON_ONCE(tx && !frame_buf))
		return;

J
Johannes Berg 已提交
2241 2242 2243
	if (WARN_ON(!ifmgd->associated))
		return;

2244 2245
	ieee80211_stop_poll(sdata);

2246
	ifmgd->associated = NULL;
2247 2248
	netif_carrier_off(sdata->dev);

2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259
	/*
	 * 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
2260 2261 2262
	/* disable per-vif ps */
	ieee80211_recalc_ps_vif(sdata);

2263 2264 2265
	/* make sure ongoing transmission finishes */
	synchronize_net();

2266 2267 2268 2269 2270 2271
	/*
	 * drop any frame before deauth/disassoc, this can be data or
	 * management frame. Since we are disconnecting, we should not
	 * insist sending these frames which can take time and delay
	 * the disconnection and possible the roaming.
	 */
2272
	if (tx)
2273
		ieee80211_flush_queues(local, sdata, true);
2274

2275
	/* deauthenticate/disassociate now */
2276 2277 2278 2279 2280 2281 2282 2283 2284
	if (tx || frame_buf) {
		/*
		 * In multi channel scenarios guarantee that the virtual
		 * interface is granted immediate airtime to transmit the
		 * deauthentication frame by calling mgd_prepare_tx, if the
		 * driver requested so.
		 */
		if (ieee80211_hw_check(&local->hw, DEAUTH_NEED_MGD_TX_PREP) &&
		    !ifmgd->have_beacon)
2285
			drv_mgd_prepare_tx(sdata->local, sdata, 0);
2286

2287 2288 2289
		ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid,
					       ifmgd->bssid, stype, reason,
					       tx, frame_buf);
2290
	}
2291

2292
	/* flush out frame - make sure the deauth was actually sent */
2293
	if (tx)
2294
		ieee80211_flush_queues(local, sdata, false);
2295

2296
	/* clear bssid only after building the needed mgmt frames */
2297
	eth_zero_addr(ifmgd->bssid);
2298

2299
	/* remove AP and TDLS peers */
2300
	sta_info_flush(sdata);
2301 2302

	/* finally reset all BSS / config parameters */
2303 2304 2305
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
J
Johannes Berg 已提交
2306 2307
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
2308

J
Janusz Dziedzic 已提交
2309 2310 2311
	ifmgd->p2p_noa_index = -1;
	memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
	       sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2312

2313
	/* on the next assoc, re-program HT/VHT parameters */
B
Ben Greear 已提交
2314 2315
	memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
	memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2316 2317
	memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
	memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2318 2319 2320 2321 2322 2323 2324

	/* reset MU-MIMO ownership and group data */
	memset(sdata->vif.bss_conf.mu_group.membership, 0,
	       sizeof(sdata->vif.bss_conf.mu_group.membership));
	memset(sdata->vif.bss_conf.mu_group.position, 0,
	       sizeof(sdata->vif.bss_conf.mu_group.position));
	changed |= BSS_CHANGED_MU_GROUPS;
2325
	sdata->vif.mu_mimo_owner = false;
2326

2327
	sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2328

2329 2330 2331
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

2332
	/* Disable ARP filtering */
2333
	if (sdata->vif.bss_conf.arp_addr_cnt)
2334 2335
		changed |= BSS_CHANGED_ARP_FILTER;

2336 2337 2338
	sdata->vif.bss_conf.qos = false;
	changed |= BSS_CHANGED_QOS;

2339 2340
	/* The BSSID (not really interesting) and HT changed */
	changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
J
Johannes Berg 已提交
2341
	ieee80211_bss_info_change_notify(sdata, changed);
2342

2343
	/* disassociated - set to defaults now */
2344
	ieee80211_set_wmm_default(sdata, false, false);
2345

2346 2347 2348 2349
	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);
2350

2351
	sdata->vif.bss_conf.dtim_period = 0;
2352 2353
	sdata->vif.bss_conf.beacon_rate = NULL;

2354
	ifmgd->have_beacon = false;
2355

2356
	ifmgd->flags = 0;
2357
	mutex_lock(&local->mtx);
2358
	ieee80211_vif_release_channel(sdata);
2359 2360

	sdata->vif.csa_active = false;
2361
	ifmgd->csa_waiting_bcn = false;
2362
	ifmgd->csa_ignored_same_chan = false;
2363 2364 2365 2366 2367
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
2368
	mutex_unlock(&local->mtx);
2369

2370 2371 2372 2373
	/* existing TX TSPEC sessions no longer exist */
	memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
	cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);

2374
	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2375
}
2376

2377 2378 2379 2380 2381 2382 2383 2384
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
2385 2386
	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
2387
	 */
J
Johannes Berg 已提交
2388 2389 2390
	if (is_multicast_ether_addr(hdr->addr1))
		return;

2391
	ieee80211_sta_reset_conn_monitor(sdata);
2392
}
2393

2394 2395 2396
static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2397
	struct ieee80211_local *local = sdata->local;
2398

2399
	mutex_lock(&local->mtx);
2400 2401
	if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
		goto out;
2402

2403
	__ieee80211_stop_poll(sdata);
2404 2405

	mutex_lock(&local->iflist_mtx);
J
Johannes Berg 已提交
2406
	ieee80211_recalc_ps(local);
2407
	mutex_unlock(&local->iflist_mtx);
2408

2409
	if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2410
		goto out;
2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421

	/*
	 * 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));
2422 2423
out:
	mutex_unlock(&local->mtx);
2424 2425
}

2426 2427 2428 2429 2430
static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
					   struct ieee80211_hdr *hdr,
					   u16 tx_time)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
S
Sara Sharon 已提交
2431
	u16 tid = ieee80211_get_tid(hdr);
2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460
	int ac = ieee80211_ac_from_tid(tid);
	struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
	unsigned long now = jiffies;

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

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

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

	if (tx_tspec->downgraded)
		return;

	tx_tspec->consumed_tx_time += tx_time;

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

2461
void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2462
			     struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2463
{
2464 2465
	ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);

F
Felix Fietkau 已提交
2466
	if (!ieee80211_is_data(hdr->frame_control))
2467 2468
	    return;

2469
	if (ieee80211_is_any_nullfunc(hdr->frame_control) &&
2470
	    sdata->u.mgd.probe_send_count > 0) {
2471
		if (ack)
2472
			ieee80211_sta_reset_conn_monitor(sdata);
2473 2474
		else
			sdata->u.mgd.nullfunc_failed = true;
2475
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2476
		return;
2477
	}
2478 2479 2480

	if (ack)
		ieee80211_sta_reset_conn_monitor(sdata);
2481 2482
}

2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496
static void ieee80211_mlme_send_probe_req(struct ieee80211_sub_if_data *sdata,
					  const u8 *src, const u8 *dst,
					  const u8 *ssid, size_t ssid_len,
					  struct ieee80211_channel *channel)
{
	struct sk_buff *skb;

	skb = ieee80211_build_probe_req(sdata, src, dst, (u32)-1, channel,
					ssid, ssid_len, NULL, 0,
					IEEE80211_PROBE_FLAG_DIRECTED);
	if (skb)
		ieee80211_tx_skb(sdata, skb);
}

2497 2498 2499 2500
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ssid;
2501
	u8 *dst = ifmgd->associated->bssid;
2502
	u8 unicast_limit = max(1, max_probe_tries - 3);
J
Johannes Berg 已提交
2503
	struct sta_info *sta;
2504 2505 2506 2507 2508 2509 2510 2511

	/*
	 * 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;
2512

2513 2514 2515 2516 2517 2518 2519
	/*
	 * 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.
	 */
2520 2521
	ifmgd->probe_send_count++;

J
Johannes Berg 已提交
2522 2523 2524 2525 2526 2527 2528 2529
	if (dst) {
		mutex_lock(&sdata->local->sta_mtx);
		sta = sta_info_get(sdata, dst);
		if (!WARN_ON(!sta))
			ieee80211_check_fast_rx(sta);
		mutex_unlock(&sdata->local->sta_mtx);
	}

2530
	if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2531
		ifmgd->nullfunc_failed = false;
2532 2533 2534 2535
		if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HE))
			ifmgd->probe_send_count--;
		else
			ieee80211_send_nullfunc(sdata->local, sdata, false);
2536
	} else {
2537 2538
		int ssid_len;

2539
		rcu_read_lock();
2540
		ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2541 2542 2543 2544 2545
		if (WARN_ON_ONCE(ssid == NULL))
			ssid_len = 0;
		else
			ssid_len = ssid[1];

2546 2547 2548
		ieee80211_mlme_send_probe_req(sdata, sdata->vif.addr, dst,
					      ssid + 2, ssid_len,
					      ifmgd->associated->channel);
2549
		rcu_read_unlock();
2550
	}
2551

2552
	ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2553
	run_again(sdata, ifmgd->probe_timeout);
2554 2555
}

J
Johannes Berg 已提交
2556 2557
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
				   bool beacon)
2558 2559
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
2560
	bool already = false;
2561

2562
	if (!ieee80211_sdata_running(sdata))
2563 2564
		return;

2565
	sdata_lock(sdata);
2566 2567 2568 2569

	if (!ifmgd->associated)
		goto out;

2570 2571 2572 2573 2574 2575 2576
	mutex_lock(&sdata->local->mtx);

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

2577
	if (beacon) {
J
Johannes Berg 已提交
2578
		mlme_dbg_ratelimited(sdata,
2579 2580
				     "detected beacon loss from AP (missed %d beacons) - probing\n",
				     beacon_loss_count);
J
Johannes Berg 已提交
2581

2582
		ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2583
	}
2584

J
Johannes Berg 已提交
2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595
	/*
	 * 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!
	 */
2596
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
J
Johannes Berg 已提交
2597 2598
		already = true;

E
Eliad Peller 已提交
2599 2600
	ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;

2601 2602
	mutex_unlock(&sdata->local->mtx);

J
Johannes Berg 已提交
2603 2604 2605
	if (already)
		goto out;

2606
	mutex_lock(&sdata->local->iflist_mtx);
J
Johannes Berg 已提交
2607
	ieee80211_recalc_ps(sdata->local);
2608 2609
	mutex_unlock(&sdata->local->iflist_mtx);

2610 2611
	ifmgd->probe_send_count = 0;
	ieee80211_mgd_probe_ap_send(sdata);
2612
 out:
2613
	sdata_unlock(sdata);
2614 2615
}

2616 2617 2618 2619 2620
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;
2621
	struct cfg80211_bss *cbss;
2622 2623
	struct sk_buff *skb;
	const u8 *ssid;
2624
	int ssid_len;
2625 2626 2627 2628

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

2629
	sdata_assert_lock(sdata);
2630

2631 2632 2633 2634 2635 2636 2637
	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
2638 2639
		return NULL;

2640
	rcu_read_lock();
2641
	ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2642 2643
	if (WARN_ONCE(!ssid || ssid[1] > IEEE80211_MAX_SSID_LEN,
		      "invalid SSID element (len=%d)", ssid ? ssid[1] : -1))
2644 2645 2646 2647
		ssid_len = 0;
	else
		ssid_len = ssid[1];

2648
	skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
J
Johannes Berg 已提交
2649
					(u32) -1, cbss->channel,
2650
					ssid + 2, ssid_len,
2651
					NULL, 0, IEEE80211_PROBE_FLAG_DIRECTED);
2652
	rcu_read_unlock();
2653 2654 2655 2656 2657

	return skb;
}
EXPORT_SYMBOL(ieee80211_ap_probereq_get);

2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675
static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
					const u8 *buf, size_t len, bool tx,
					u16 reason)
{
	struct ieee80211_event event = {
		.type = MLME_EVENT,
		.u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
		.u.mlme.reason = reason,
	};

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

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

2676
static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2677
{
2678
	struct ieee80211_local *local = sdata->local;
2679
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2680
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2681
	bool tx;
2682

2683
	sdata_lock(sdata);
2684
	if (!ifmgd->associated) {
2685
		sdata_unlock(sdata);
2686 2687 2688
		return;
	}

2689 2690
	tx = !sdata->csa_block_tx;

2691 2692 2693 2694 2695
	/* AP is probably out of range (or not reachable for another reason) so
	 * remove the bss struct for that AP.
	 */
	cfg80211_unlink_bss(local->hw.wiphy, ifmgd->associated);

2696 2697
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
			       WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2698
			       tx, frame_buf);
2699
	mutex_lock(&local->mtx);
2700
	sdata->vif.csa_active = false;
2701
	ifmgd->csa_waiting_bcn = false;
2702 2703 2704 2705 2706
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
2707
	mutex_unlock(&local->mtx);
2708

2709
	ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), tx,
2710 2711
				    WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);

2712
	sdata_unlock(sdata);
2713 2714
}

2715
static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
J
Johannes Berg 已提交
2716 2717 2718
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
2719
			     u.mgd.beacon_connection_loss_work);
2720 2721
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

2722 2723
	if (ifmgd->associated)
		ifmgd->beacon_loss_count++;
J
Johannes Berg 已提交
2724

2725
	if (ifmgd->connection_loss) {
2726 2727
		sdata_info(sdata, "Connection to AP %pM lost\n",
			   ifmgd->bssid);
2728
		__ieee80211_disconnect(sdata);
2729
	} else {
2730
		ieee80211_mgd_probe_ap(sdata, true);
2731 2732 2733 2734 2735 2736 2737 2738 2739
	}
}

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);

2740
	__ieee80211_disconnect(sdata);
J
Johannes Berg 已提交
2741 2742
}

2743 2744 2745
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2746
	struct ieee80211_hw *hw = &sdata->local->hw;
2747

J
Johannes Berg 已提交
2748 2749
	trace_api_beacon_loss(sdata);

2750
	sdata->u.mgd.connection_loss = false;
2751
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2752 2753 2754
}
EXPORT_SYMBOL(ieee80211_beacon_loss);

2755 2756 2757 2758 2759
void ieee80211_connection_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_hw *hw = &sdata->local->hw;

J
Johannes Berg 已提交
2760 2761
	trace_api_connection_loss(sdata);

2762
	sdata->u.mgd.connection_loss = true;
2763 2764 2765 2766 2767
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_connection_loss);


J
Johannes Berg 已提交
2768 2769 2770 2771 2772
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;

2773
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2774 2775

	if (!assoc) {
2776 2777 2778 2779 2780 2781
		/*
		 * we are not authenticated yet, the only timer that could be
		 * running is the timeout for the authentication response which
		 * which is not relevant anymore.
		 */
		del_timer_sync(&sdata->u.mgd.timer);
J
Johannes Berg 已提交
2782 2783
		sta_info_destroy_addr(sdata, auth_data->bss->bssid);

2784
		eth_zero_addr(sdata->u.mgd.bssid);
J
Johannes Berg 已提交
2785
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2786
		sdata->u.mgd.flags = 0;
2787
		mutex_lock(&sdata->local->mtx);
J
Johannes Berg 已提交
2788
		ieee80211_vif_release_channel(sdata);
2789
		mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
2790 2791
	}

2792
	cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
J
Johannes Berg 已提交
2793 2794 2795 2796
	kfree(auth_data);
	sdata->u.mgd.auth_data = NULL;
}

2797
static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2798
					 bool assoc, bool abandon)
2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815
{
	struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;

	sdata_assert_lock(sdata);

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

		eth_zero_addr(sdata->u.mgd.bssid);
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
		sdata->u.mgd.flags = 0;
2816 2817
		sdata->vif.mu_mimo_owner = false;

2818 2819 2820
		mutex_lock(&sdata->local->mtx);
		ieee80211_vif_release_channel(sdata);
		mutex_unlock(&sdata->local->mtx);
2821 2822 2823

		if (abandon)
			cfg80211_abandon_assoc(sdata->dev, assoc_data->bss);
2824 2825 2826 2827 2828 2829
	}

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

J
Johannes Berg 已提交
2830 2831 2832
static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
{
2833
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
2834 2835 2836
	struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
	u8 *pos;
	struct ieee802_11_elems elems;
2837
	u32 tx_flags = 0;
J
Johannes Berg 已提交
2838 2839

	pos = mgmt->u.auth.variable;
2840 2841
	ieee802_11_parse_elems(pos, len - (pos - (u8 *)mgmt), false, &elems,
			       mgmt->bssid, auth_data->bss->bssid);
J
Johannes Berg 已提交
2842 2843 2844
	if (!elems.challenge)
		return;
	auth_data->expected_transaction = 4;
2845
	drv_mgd_prepare_tx(sdata->local, sdata, 0);
2846
	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2847 2848
		tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
			   IEEE80211_TX_INTFL_MLME_CONN_TX;
2849
	ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
J
Johannes Berg 已提交
2850 2851 2852
			    elems.challenge - 2, elems.challenge_len + 2,
			    auth_data->bss->bssid, auth_data->bss->bssid,
			    auth_data->key, auth_data->key_len,
2853
			    auth_data->key_idx, tx_flags);
J
Johannes Berg 已提交
2854 2855
}

2856 2857 2858
static bool ieee80211_mark_sta_auth(struct ieee80211_sub_if_data *sdata,
				    const u8 *bssid)
{
2859
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2860
	struct sta_info *sta;
2861
	bool result = true;
2862

2863 2864 2865 2866 2867 2868
	sdata_info(sdata, "authenticated\n");
	ifmgd->auth_data->done = true;
	ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
	ifmgd->auth_data->timeout_started = true;
	run_again(sdata, ifmgd->auth_data->timeout);

2869 2870 2871 2872 2873
	/* 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);
2874 2875
		result = false;
		goto out;
2876 2877 2878
	}
	if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
		sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2879 2880
		result = false;
		goto out;
2881 2882
	}

2883 2884 2885
out:
	mutex_unlock(&sdata->local->sta_mtx);
	return result;
2886 2887
}

2888 2889
static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_mgmt *mgmt, size_t len)
J
Johannes Berg 已提交
2890 2891 2892 2893
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u8 bssid[ETH_ALEN];
	u16 auth_alg, auth_transaction, status_code;
2894 2895 2896 2897
	struct ieee80211_event event = {
		.type = MLME_EVENT,
		.u.mlme.data = AUTH_EVENT,
	};
J
Johannes Berg 已提交
2898

2899
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2900 2901

	if (len < 24 + 6)
2902
		return;
J
Johannes Berg 已提交
2903 2904

	if (!ifmgd->auth_data || ifmgd->auth_data->done)
2905
		return;
J
Johannes Berg 已提交
2906 2907 2908

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

2909
	if (!ether_addr_equal(bssid, mgmt->bssid))
2910
		return;
J
Johannes Berg 已提交
2911 2912 2913 2914 2915 2916

	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 ||
2917 2918 2919 2920 2921
	    (auth_alg != WLAN_AUTH_SAE &&
	     auth_transaction != ifmgd->auth_data->expected_transaction) ||
	    (auth_alg == WLAN_AUTH_SAE &&
	     (auth_transaction < ifmgd->auth_data->expected_transaction ||
	      auth_transaction > 2))) {
2922 2923 2924 2925
		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);
2926
		return;
2927
	}
J
Johannes Berg 已提交
2928 2929

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
2930 2931
		sdata_info(sdata, "%pM denied authentication (status %d)\n",
			   mgmt->sa, status_code);
2932
		ieee80211_destroy_auth_data(sdata, false);
2933
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2934 2935 2936
		event.u.mlme.status = MLME_DENIED;
		event.u.mlme.reason = status_code;
		drv_event_callback(sdata->local, sdata, &event);
2937
		return;
J
Johannes Berg 已提交
2938 2939 2940 2941 2942 2943
	}

	switch (ifmgd->auth_data->algorithm) {
	case WLAN_AUTH_OPEN:
	case WLAN_AUTH_LEAP:
	case WLAN_AUTH_FT:
2944
	case WLAN_AUTH_SAE:
2945 2946 2947
	case WLAN_AUTH_FILS_SK:
	case WLAN_AUTH_FILS_SK_PFS:
	case WLAN_AUTH_FILS_PK:
J
Johannes Berg 已提交
2948 2949 2950 2951 2952
		break;
	case WLAN_AUTH_SHARED_KEY:
		if (ifmgd->auth_data->expected_transaction != 4) {
			ieee80211_auth_challenge(sdata, mgmt, len);
			/* need another frame */
2953
			return;
J
Johannes Berg 已提交
2954 2955 2956 2957 2958
		}
		break;
	default:
		WARN_ONCE(1, "invalid auth alg %d",
			  ifmgd->auth_data->algorithm);
2959
		return;
J
Johannes Berg 已提交
2960 2961
	}

2962 2963
	event.u.mlme.status = MLME_SUCCESS;
	drv_event_callback(sdata->local, sdata, &event);
2964 2965 2966 2967 2968 2969 2970 2971 2972
	if (ifmgd->auth_data->algorithm != WLAN_AUTH_SAE ||
	    (auth_transaction == 2 &&
	     ifmgd->auth_data->expected_transaction == 2)) {
		if (!ieee80211_mark_sta_auth(sdata, bssid))
			goto out_err;
	} else if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
		   auth_transaction == 2) {
		sdata_info(sdata, "SAE peer confirmed\n");
		ifmgd->auth_data->peer_confirmed = true;
2973 2974
	}

2975
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2976
	return;
J
Johannes Berg 已提交
2977 2978 2979 2980 2981
 out_err:
	mutex_unlock(&sdata->local->sta_mtx);
	/* ignore frame -- wait for timeout */
}

2982 2983 2984
#define case_WLAN(type) \
	case WLAN_REASON_##type: return #type

2985
const char *ieee80211_get_reason_code_string(u16 reason_code)
2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037
{
	switch (reason_code) {
	case_WLAN(UNSPECIFIED);
	case_WLAN(PREV_AUTH_NOT_VALID);
	case_WLAN(DEAUTH_LEAVING);
	case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
	case_WLAN(DISASSOC_AP_BUSY);
	case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
	case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
	case_WLAN(DISASSOC_STA_HAS_LEFT);
	case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
	case_WLAN(DISASSOC_BAD_POWER);
	case_WLAN(DISASSOC_BAD_SUPP_CHAN);
	case_WLAN(INVALID_IE);
	case_WLAN(MIC_FAILURE);
	case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
	case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
	case_WLAN(IE_DIFFERENT);
	case_WLAN(INVALID_GROUP_CIPHER);
	case_WLAN(INVALID_PAIRWISE_CIPHER);
	case_WLAN(INVALID_AKMP);
	case_WLAN(UNSUPP_RSN_VERSION);
	case_WLAN(INVALID_RSN_IE_CAP);
	case_WLAN(IEEE8021X_FAILED);
	case_WLAN(CIPHER_SUITE_REJECTED);
	case_WLAN(DISASSOC_UNSPECIFIED_QOS);
	case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
	case_WLAN(DISASSOC_LOW_ACK);
	case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
	case_WLAN(QSTA_LEAVE_QBSS);
	case_WLAN(QSTA_NOT_USE);
	case_WLAN(QSTA_REQUIRE_SETUP);
	case_WLAN(QSTA_TIMEOUT);
	case_WLAN(QSTA_CIPHER_NOT_SUPP);
	case_WLAN(MESH_PEER_CANCELED);
	case_WLAN(MESH_MAX_PEERS);
	case_WLAN(MESH_CONFIG);
	case_WLAN(MESH_CLOSE);
	case_WLAN(MESH_MAX_RETRIES);
	case_WLAN(MESH_CONFIRM_TIMEOUT);
	case_WLAN(MESH_INVALID_GTK);
	case_WLAN(MESH_INCONSISTENT_PARAM);
	case_WLAN(MESH_INVALID_SECURITY);
	case_WLAN(MESH_PATH_ERROR);
	case_WLAN(MESH_PATH_NOFORWARD);
	case_WLAN(MESH_PATH_DEST_UNREACHABLE);
	case_WLAN(MAC_EXISTS_IN_MBSS);
	case_WLAN(MESH_CHAN_REGULATORY);
	case_WLAN(MESH_CHAN);
	default: return "<unknown>";
	}
}
J
Johannes Berg 已提交
3038

3039 3040
static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
3041
{
3042
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3043
	u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
3044

3045
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3046

3047
	if (len < 24 + 2)
3048
		return;
3049

3050 3051 3052 3053 3054
	if (!ether_addr_equal(mgmt->bssid, mgmt->sa)) {
		ieee80211_tdls_handle_disconnect(sdata, mgmt->sa, reason_code);
		return;
	}

3055 3056 3057
	if (ifmgd->associated &&
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
		const u8 *bssid = ifmgd->associated->bssid;
3058

3059 3060 3061
		sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
			   bssid, reason_code,
			   ieee80211_get_reason_code_string(reason_code));
3062

3063
		ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3064

3065 3066 3067 3068
		ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
					    reason_code);
		return;
	}
3069

3070 3071 3072
	if (ifmgd->assoc_data &&
	    ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
		const u8 *bssid = ifmgd->assoc_data->bss->bssid;
3073

3074 3075 3076 3077 3078
		sdata_info(sdata,
			   "deauthenticated from %pM while associating (Reason: %u=%s)\n",
			   bssid, reason_code,
			   ieee80211_get_reason_code_string(reason_code));

3079
		ieee80211_destroy_assoc_data(sdata, false, true);
3080 3081 3082 3083

		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
		return;
	}
3084 3085 3086
}


3087 3088
static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_mgmt *mgmt, size_t len)
3089
{
3090
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3091 3092
	u16 reason_code;

3093
	sdata_assert_lock(sdata);
3094

J
Johannes Berg 已提交
3095
	if (len < 24 + 2)
3096
		return;
3097

J
Johannes Berg 已提交
3098
	if (!ifmgd->associated ||
3099
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3100
		return;
3101 3102 3103

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

3104 3105 3106 3107 3108
	if (!ether_addr_equal(mgmt->bssid, mgmt->sa)) {
		ieee80211_tdls_handle_disconnect(sdata, mgmt->sa, reason_code);
		return;
	}

3109 3110 3111
	sdata_info(sdata, "disassociated from %pM (Reason: %u=%s)\n",
		   mgmt->sa, reason_code,
		   ieee80211_get_reason_code_string(reason_code));
3112

3113 3114
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

3115
	ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
3116 3117
}

3118 3119 3120 3121
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,
3122
				int *min_rate, int *min_rate_index,
3123
				int shift)
3124 3125 3126 3127
{
	int i, j;

	for (i = 0; i < supp_rates_len; i++) {
3128
		int rate = supp_rates[i] & 0x7f;
3129 3130
		bool is_basic = !!(supp_rates[i] & 0x80);

3131
		if ((rate * 5 * (1 << shift)) > 110)
3132 3133 3134
			*have_higher_than_11mbit = true;

		/*
3135 3136
		 * Skip HT and VHT BSS membership selectors since they're not
		 * rates.
3137
		 *
3138
		 * Note: Even though the membership selector and the basic
3139 3140 3141
		 *	 rate flag share the same bit, they are not exactly
		 *	 the same.
		 */
3142 3143
		if (supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_HT_PHY) ||
		    supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_VHT_PHY))
3144 3145 3146
			continue;

		for (j = 0; j < sband->n_bitrates; j++) {
3147 3148 3149 3150 3151 3152 3153
			struct ieee80211_rate *br;
			int brate;

			br = &sband->bitrates[j];

			brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
			if (brate == rate) {
3154 3155 3156
				*rates |= BIT(j);
				if (is_basic)
					*basic_rates |= BIT(j);
3157 3158
				if ((rate * 5) < *min_rate) {
					*min_rate = rate * 5;
3159 3160 3161 3162 3163 3164 3165
					*min_rate_index = j;
				}
				break;
			}
		}
	}
}
3166

3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179
static bool ieee80211_twt_req_supported(const struct sta_info *sta,
					const struct ieee802_11_elems *elems)
{
	if (elems->ext_capab_len < 10)
		return false;

	if (!(elems->ext_capab[9] & WLAN_EXT_CAPA10_TWT_RESPONDER_SUPPORT))
		return false;

	return sta->sta.he_cap.he_cap_elem.mac_cap_info[0] &
		IEEE80211_HE_MAC_CAP0_TWT_RES;
}

3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192
static int ieee80211_recalc_twt_req(struct ieee80211_sub_if_data *sdata,
				    struct sta_info *sta,
				    struct ieee802_11_elems *elems)
{
	bool twt = ieee80211_twt_req_supported(sta, elems);

	if (sdata->vif.bss_conf.twt_requester != twt) {
		sdata->vif.bss_conf.twt_requester = twt;
		return BSS_CHANGED_TWT;
	}
	return 0;
}

J
Johannes Berg 已提交
3193 3194
static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
				    struct cfg80211_bss *cbss,
3195 3196
				    struct ieee80211_mgmt *mgmt, size_t len,
				    struct ieee802_11_elems *elems)
3197
{
3198
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3199
	struct ieee80211_local *local = sdata->local;
3200
	struct ieee80211_supported_band *sband;
3201
	struct sta_info *sta;
J
Johannes Berg 已提交
3202
	u16 capab_info, aid;
J
Johannes Berg 已提交
3203
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3204 3205
	const struct cfg80211_bss_ies *bss_ies = NULL;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
J
Johannes Berg 已提交
3206
	u32 changed = 0;
3207
	int err;
3208
	bool ret;
3209

J
Johannes Berg 已提交
3210
	/* AssocResp and ReassocResp have identical structure */
3211 3212

	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
J
Johannes Berg 已提交
3213
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3214

3215 3216 3217 3218 3219
	/*
	 * The 5 MSB of the AID field are reserved
	 * (802.11-2016 9.4.1.8 AID field)
	 */
	aid &= 0x7ff;
3220

3221 3222 3223
	ifmgd->broken_ap = false;

	if (aid == 0 || aid > IEEE80211_MAX_AID) {
J
Johannes Berg 已提交
3224 3225
		sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
			   aid);
3226 3227 3228 3229
		aid = 0;
		ifmgd->broken_ap = true;
	}

3230
	if (!elems->supp_rates) {
J
Johannes Berg 已提交
3231
		sdata_info(sdata, "no SuppRates element in AssocResp\n");
J
Johannes Berg 已提交
3232
		return false;
3233 3234
	}

3235
	ifmgd->aid = aid;
3236
	ifmgd->tdls_chan_switch_prohibited =
3237 3238
		elems->ext_capab && elems->ext_capab_len >= 5 &&
		(elems->ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
3239

3240 3241 3242 3243 3244 3245 3246
	/*
	 * 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.
	 */
3247
	if ((assoc_data->wmm && !elems->wmm_param) ||
3248
	    (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3249
	     (!elems->ht_cap_elem || !elems->ht_operation)) ||
3250
	    (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3251
	     (!elems->vht_cap_elem || !elems->vht_operation))) {
3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264
		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,
3265 3266 3267
				       false, &bss_elems,
				       mgmt->bssid,
				       assoc_data->bss->bssid);
3268
		if (assoc_data->wmm &&
3269 3270
		    !elems->wmm_param && bss_elems.wmm_param) {
			elems->wmm_param = bss_elems.wmm_param;
3271 3272 3273 3274 3275 3276 3277 3278
			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.
		 */
3279
		if (!elems->ht_cap_elem && bss_elems.ht_cap_elem &&
3280
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
3281
			elems->ht_cap_elem = bss_elems.ht_cap_elem;
3282 3283 3284
			sdata_info(sdata,
				   "AP bug: HT capability missing from AssocResp\n");
		}
3285
		if (!elems->ht_operation && bss_elems.ht_operation &&
3286
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
3287
			elems->ht_operation = bss_elems.ht_operation;
3288 3289 3290
			sdata_info(sdata,
				   "AP bug: HT operation missing from AssocResp\n");
		}
3291
		if (!elems->vht_cap_elem && bss_elems.vht_cap_elem &&
3292
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
3293
			elems->vht_cap_elem = bss_elems.vht_cap_elem;
3294 3295 3296
			sdata_info(sdata,
				   "AP bug: VHT capa missing from AssocResp\n");
		}
3297
		if (!elems->vht_operation && bss_elems.vht_operation &&
3298
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
3299
			elems->vht_operation = bss_elems.vht_operation;
3300 3301 3302 3303 3304
			sdata_info(sdata,
				   "AP bug: VHT operation missing from AssocResp\n");
		}
	}

3305 3306 3307 3308 3309
	/*
	 * 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) &&
3310
	    (!elems->wmm_param || !elems->ht_cap_elem || !elems->ht_operation)) {
3311
		sdata_info(sdata,
3312 3313 3314
			   "HT AP is missing WMM params or HT capability/operation\n");
		ret = false;
		goto out;
3315 3316 3317
	}

	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3318
	    (!elems->vht_cap_elem || !elems->vht_operation)) {
3319
		sdata_info(sdata,
3320 3321 3322
			   "VHT AP is missing VHT capability/operation\n");
		ret = false;
		goto out;
3323 3324
	}

3325 3326 3327 3328 3329
	mutex_lock(&sdata->local->sta_mtx);
	/*
	 * station info was already allocated and inserted before
	 * the association and should be available to us
	 */
3330
	sta = sta_info_get(sdata, cbss->bssid);
3331 3332
	if (WARN_ON(!sta)) {
		mutex_unlock(&sdata->local->sta_mtx);
3333 3334
		ret = false;
		goto out;
3335
	}
3336

3337 3338 3339 3340 3341 3342
	sband = ieee80211_get_sband(sdata);
	if (!sband) {
		mutex_unlock(&sdata->local->sta_mtx);
		ret = false;
		goto out;
	}
3343

L
Luca Coelho 已提交
3344
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HE) &&
3345
	    (!elems->he_cap || !elems->he_operation)) {
L
Luca Coelho 已提交
3346 3347 3348 3349 3350 3351 3352
		mutex_unlock(&sdata->local->sta_mtx);
		sdata_info(sdata,
			   "HE AP is missing HE capability/operation\n");
		ret = false;
		goto out;
	}

3353
	/* Set up internal HT/VHT capabilities */
3354
	if (elems->ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
B
Ben Greear 已提交
3355
		ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3356
						  elems->ht_cap_elem, sta);
3357

3358
	if (elems->vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
M
Mahesh Palivela 已提交
3359
		ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3360
						    elems->vht_cap_elem, sta);
M
Mahesh Palivela 已提交
3361

3362 3363
	if (elems->he_operation && !(ifmgd->flags & IEEE80211_STA_DISABLE_HE) &&
	    elems->he_cap) {
L
Luca Coelho 已提交
3364
		ieee80211_he_cap_ie_to_sta_he_cap(sdata, sband,
3365 3366
						  elems->he_cap,
						  elems->he_cap_len,
L
Luca Coelho 已提交
3367 3368 3369
						  sta);

		bss_conf->he_support = sta->sta.he_cap.has_he;
3370
		changed |= ieee80211_recalc_twt_req(sdata, sta, elems);
L
Luca Coelho 已提交
3371 3372
	} else {
		bss_conf->he_support = false;
3373
		bss_conf->twt_requester = false;
L
Luca Coelho 已提交
3374 3375 3376
	}

	if (bss_conf->he_support) {
3377
		bss_conf->he_bss_color.color =
3378
			le32_get_bits(elems->he_operation->he_oper_params,
3379
				      IEEE80211_HE_OPERATION_BSS_COLOR_MASK);
3380 3381 3382 3383 3384 3385 3386
		bss_conf->he_bss_color.partial =
			le32_get_bits(elems->he_operation->he_oper_params,
				      IEEE80211_HE_OPERATION_PARTIAL_BSS_COLOR);
		bss_conf->he_bss_color.disabled =
			le32_get_bits(elems->he_operation->he_oper_params,
				      IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED);
		changed |= BSS_CHANGED_HE_BSS_COLOR;
L
Luca Coelho 已提交
3387 3388

		bss_conf->htc_trig_based_pkt_ext =
3389
			le32_get_bits(elems->he_operation->he_oper_params,
3390
			      IEEE80211_HE_OPERATION_DFLT_PE_DURATION_MASK);
L
Luca Coelho 已提交
3391
		bss_conf->frame_time_rts_th =
3392
			le32_get_bits(elems->he_operation->he_oper_params,
3393
			      IEEE80211_HE_OPERATION_RTS_THRESHOLD_MASK);
L
Luca Coelho 已提交
3394 3395 3396 3397 3398 3399 3400 3401 3402

		bss_conf->multi_sta_back_32bit =
			sta->sta.he_cap.he_cap_elem.mac_cap_info[2] &
			IEEE80211_HE_MAC_CAP2_32BIT_BA_BITMAP;

		bss_conf->ack_enabled =
			sta->sta.he_cap.he_cap_elem.mac_cap_info[2] &
			IEEE80211_HE_MAC_CAP2_ACK_EN;

3403 3404 3405
		bss_conf->uora_exists = !!elems->uora_element;
		if (elems->uora_element)
			bss_conf->uora_ocw_range = elems->uora_element[0];
L
Luca Coelho 已提交
3406

3407 3408
		ieee80211_he_op_ie_to_bss_conf(&sdata->vif, elems->he_operation);
		ieee80211_he_spr_ie_to_bss_conf(&sdata->vif, elems->he_spr);
L
Luca Coelho 已提交
3409 3410 3411
		/* TODO: OPEN: what happens if BSS color disable is set? */
	}

S
Sara Sharon 已提交
3412 3413 3414 3415 3416 3417 3418 3419
	if (cbss->transmitted_bss) {
		bss_conf->nontransmitted = true;
		ether_addr_copy(bss_conf->transmitter_bssid,
				cbss->transmitted_bss->bssid);
		bss_conf->bssid_indicator = cbss->max_bssid_indicator;
		bss_conf->bssid_index = cbss->bssid_index;
	}

3420 3421 3422 3423 3424 3425
	/*
	 * 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.
	 */
3426

3427 3428 3429 3430 3431
	/*
	 * 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.
	 */
3432 3433
	if (elems->opmode_notif &&
	    !(*elems->opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3434 3435
		u8 nss;

3436
		nss = *elems->opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3437 3438 3439 3440 3441
		nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
		nss += 1;
		sta->sta.rx_nss = nss;
	}

3442
	rate_control_rate_init(sta);
3443

3444
	if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
J
Johannes Berg 已提交
3445
		set_sta_flag(sta, WLAN_STA_MFP);
3446 3447 3448 3449
		sta->sta.mfp = true;
	} else {
		sta->sta.mfp = false;
	}
3450

3451
	sta->sta.wme = elems->wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3452

3453
	err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3454 3455 3456
	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
3457 3458 3459
		sdata_info(sdata,
			   "failed to move station %pM to desired state\n",
			   sta->sta.addr);
3460 3461
		WARN_ON(__sta_info_destroy(sta));
		mutex_unlock(&sdata->local->sta_mtx);
3462 3463
		ret = false;
		goto out;
3464 3465
	}

3466
	mutex_unlock(&sdata->local->sta_mtx);
3467

3468 3469 3470 3471 3472 3473 3474
	/*
	 * 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;
3475
	ifmgd->mu_edca_last_param_set = -1;
3476

3477
	if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3478
		ieee80211_set_wmm_default(sdata, false, false);
3479 3480 3481
	} else if (!ieee80211_sta_wmm_params(local, sdata, elems->wmm_param,
					     elems->wmm_param_len,
					     elems->mu_edca_param_set)) {
3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492
		/* still enable QoS since we might have HT/VHT */
		ieee80211_set_wmm_default(sdata, false, true);
		/* set the disable-WMM flag in this case to disable
		 * tracking WMM parameter changes in the beacon if
		 * the parameters weren't actually valid. Doing so
		 * avoids changing parameters very strangely when
		 * the AP is going back and forth between valid and
		 * invalid parameters.
		 */
		ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
	}
3493
	changed |= BSS_CHANGED_QOS;
3494

3495
	if (elems->max_idle_period_ie) {
3496
		bss_conf->max_idle_period =
3497
			le16_to_cpu(elems->max_idle_period_ie->max_idle_period);
3498
		bss_conf->protected_keep_alive =
3499
			!!(elems->max_idle_period_ie->idle_options &
3500 3501 3502 3503 3504 3505 3506
			   WLAN_IDLE_OPTIONS_PROTECTED_KEEP_ALIVE);
		changed |= BSS_CHANGED_KEEP_ALIVE;
	} else {
		bss_conf->max_idle_period = 0;
		bss_conf->protected_keep_alive = false;
	}

J
Johannes Berg 已提交
3507 3508 3509 3510
	/* set AID and assoc capability,
	 * ieee80211_set_associated() will tell the driver */
	bss_conf->aid = aid;
	bss_conf->assoc_capability = capab_info;
3511
	ieee80211_set_associated(sdata, cbss, changed);
3512

3513 3514 3515 3516 3517 3518 3519
	/*
	 * 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);

3520
	/*
J
Johannes Berg 已提交
3521 3522
	 * Start timer to probe the connection to the AP now.
	 * Also start the timer that will detect beacon loss.
3523
	 */
J
Johannes Berg 已提交
3524
	ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3525
	ieee80211_sta_reset_beacon_monitor(sdata);
3526

3527 3528 3529 3530
	ret = true;
 out:
	kfree(bss_ies);
	return ret;
3531 3532
}

3533 3534 3535
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
3536 3537 3538 3539 3540
{
	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;
3541
	int ac, uapsd_queues = -1;
J
Johannes Berg 已提交
3542 3543
	u8 *pos;
	bool reassoc;
3544
	struct cfg80211_bss *bss;
3545 3546 3547 3548
	struct ieee80211_event event = {
		.type = MLME_EVENT,
		.u.mlme.data = ASSOC_EVENT,
	};
J
Johannes Berg 已提交
3549

3550
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3551 3552

	if (!assoc_data)
3553
		return;
3554
	if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3555
		return;
J
Johannes Berg 已提交
3556 3557 3558 3559 3560 3561 3562

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

	if (len < 24 + 6)
3563
		return;
J
Johannes Berg 已提交
3564

3565
	reassoc = ieee80211_is_reassoc_resp(mgmt->frame_control);
J
Johannes Berg 已提交
3566 3567 3568 3569
	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
3570 3571 3572 3573
	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
3574

3575 3576 3577 3578
	if (assoc_data->fils_kek_len &&
	    fils_decrypt_assoc_resp(sdata, (u8 *)mgmt, &len, assoc_data) < 0)
		return;

J
Johannes Berg 已提交
3579
	pos = mgmt->u.assoc_resp.variable;
3580 3581
	ieee802_11_parse_elems(pos, len - (pos - (u8 *)mgmt), false, &elems,
			       mgmt->bssid, assoc_data->bss->bssid);
J
Johannes Berg 已提交
3582 3583

	if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3584 3585
	    elems.timeout_int &&
	    elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
J
Johannes Berg 已提交
3586
		u32 tu, ms;
3587
		tu = le32_to_cpu(elems.timeout_int->value);
J
Johannes Berg 已提交
3588
		ms = tu * 1024 / 1000;
J
Johannes Berg 已提交
3589 3590 3591
		sdata_info(sdata,
			   "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
			   mgmt->sa, tu, ms);
J
Johannes Berg 已提交
3592
		assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3593
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
3594
		if (ms > IEEE80211_ASSOC_TIMEOUT)
3595 3596
			run_again(sdata, assoc_data->timeout);
		return;
J
Johannes Berg 已提交
3597 3598
	}

3599
	bss = assoc_data->bss;
J
Johannes Berg 已提交
3600 3601

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
3602 3603
		sdata_info(sdata, "%pM denied association (code=%d)\n",
			   mgmt->sa, status_code);
3604
		ieee80211_destroy_assoc_data(sdata, false, false);
3605 3606 3607
		event.u.mlme.status = MLME_DENIED;
		event.u.mlme.reason = status_code;
		drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
3608
	} else {
3609
		if (!ieee80211_assoc_success(sdata, bss, mgmt, len, &elems)) {
J
Johannes Berg 已提交
3610
			/* oops -- internal error -- send timeout for now */
3611
			ieee80211_destroy_assoc_data(sdata, false, false);
3612
			cfg80211_assoc_timeout(sdata->dev, bss);
3613
			return;
J
Johannes Berg 已提交
3614
		}
3615 3616
		event.u.mlme.status = MLME_SUCCESS;
		drv_event_callback(sdata->local, sdata, &event);
3617
		sdata_info(sdata, "associated\n");
3618 3619 3620 3621 3622 3623

		/*
		 * 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
		 */
3624
		ieee80211_destroy_assoc_data(sdata, true, false);
3625 3626 3627 3628 3629

		/* get uapsd queues configuration */
		uapsd_queues = 0;
		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
			if (sdata->tx_conf[ac].uapsd)
3630
				uapsd_queues |= ieee80211_ac_to_qos_mask[ac];
J
Johannes Berg 已提交
3631 3632
	}

3633 3634
	cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues,
			       ifmgd->assoc_req_ies, ifmgd->assoc_req_ies_len);
J
Johannes Berg 已提交
3635
}
J
Johannes Berg 已提交
3636

3637
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
3638
				  struct ieee80211_mgmt *mgmt, size_t len,
3639
				  struct ieee80211_rx_status *rx_status)
3640 3641
{
	struct ieee80211_local *local = sdata->local;
3642
	struct ieee80211_bss *bss;
3643
	struct ieee80211_channel *channel;
3644

3645
	sdata_assert_lock(sdata);
3646

3647 3648
	channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
	if (!channel)
3649 3650
		return;

3651
	bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
3652 3653
	if (bss) {
		sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3654
		ieee80211_rx_bss_put(local, bss);
3655
	}
3656 3657 3658
}


3659
static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
3660
					 struct sk_buff *skb)
3661
{
J
Johannes Berg 已提交
3662
	struct ieee80211_mgmt *mgmt = (void *)skb->data;
3663
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
3664 3665
	struct ieee80211_rx_status *rx_status = (void *) skb->cb;
	size_t baselen, len = skb->len;
3666

3667 3668
	ifmgd = &sdata->u.mgd;

3669
	sdata_assert_lock(sdata);
3670

3671
	if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3672 3673
		return; /* ignore ProbeResp to foreign address */

3674 3675 3676 3677
	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
	if (baselen > len)
		return;

3678
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status);
3679

3680
	if (ifmgd->associated &&
3681
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3682
		ieee80211_reset_ap_probe(sdata);
3683 3684
}

3685 3686 3687
/*
 * This is the canonical list of information elements we care about,
 * the filter code also gives us all changes to the Microsoft OUI
3688 3689 3690
 * (00:50:F2) vendor IE which is used for WMM which we need to track,
 * as well as the DTPC IE (part of the Cisco OUI) used for signaling
 * changes to requested client power.
3691 3692 3693 3694 3695 3696 3697 3698 3699 3700
 *
 * 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 =
3701 3702 3703 3704 3705
	(1ULL << WLAN_EID_COUNTRY) |
	(1ULL << WLAN_EID_ERP_INFO) |
	(1ULL << WLAN_EID_CHANNEL_SWITCH) |
	(1ULL << WLAN_EID_PWR_CONSTRAINT) |
	(1ULL << WLAN_EID_HT_CAPABILITY) |
3706 3707
	(1ULL << WLAN_EID_HT_OPERATION) |
	(1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3708

3709 3710 3711 3712 3713
static void ieee80211_handle_beacon_sig(struct ieee80211_sub_if_data *sdata,
					struct ieee80211_if_managed *ifmgd,
					struct ieee80211_bss_conf *bss_conf,
					struct ieee80211_local *local,
					struct ieee80211_rx_status *rx_status)
3714
{
3715
	/* Track average RSSI from the Beacon frames of the current AP */
3716

3717 3718
	if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
		ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3719
		ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3720
		ifmgd->last_cqm_event_signal = 0;
3721
		ifmgd->count_beacon_signal = 1;
3722
		ifmgd->last_ave_beacon_signal = 0;
3723
	} else {
3724
		ifmgd->count_beacon_signal++;
3725
	}
3726

3727 3728
	ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);

3729 3730
	if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3731
		int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3732
		int last_sig = ifmgd->last_ave_beacon_signal;
3733 3734 3735
		struct ieee80211_event event = {
			.type = RSSI_EVENT,
		};
3736 3737 3738 3739 3740 3741 3742 3743

		/*
		 * 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;
3744 3745
			event.u.rssi.data = RSSI_EVENT_HIGH;
			drv_event_callback(local, sdata, &event);
3746 3747 3748 3749
		} else if (sig < ifmgd->rssi_min_thold &&
			   (last_sig >= ifmgd->rssi_max_thold ||
			   last_sig == 0)) {
			ifmgd->last_ave_beacon_signal = sig;
3750 3751
			event.u.rssi.data = RSSI_EVENT_LOW;
			drv_event_callback(local, sdata, &event);
3752 3753 3754
		}
	}

3755
	if (bss_conf->cqm_rssi_thold &&
3756
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3757
	    !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3758
		int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3759 3760 3761
		int last_event = ifmgd->last_cqm_event_signal;
		int thold = bss_conf->cqm_rssi_thold;
		int hyst = bss_conf->cqm_rssi_hyst;
3762

3763 3764 3765 3766 3767 3768
		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,
3769
				sig, GFP_KERNEL);
3770 3771 3772 3773 3774 3775
		} 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,
3776
				sig, GFP_KERNEL);
3777 3778 3779
		}
	}

3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802
	if (bss_conf->cqm_rssi_low &&
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
		int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
		int last_event = ifmgd->last_cqm_event_signal;
		int low = bss_conf->cqm_rssi_low;
		int high = bss_conf->cqm_rssi_high;

		if (sig < low &&
		    (last_event == 0 || last_event >= low)) {
			ifmgd->last_cqm_event_signal = sig;
			ieee80211_cqm_rssi_notify(
				&sdata->vif,
				NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
				sig, GFP_KERNEL);
		} else if (sig > high &&
			   (last_event == 0 || last_event <= high)) {
			ifmgd->last_cqm_event_signal = sig;
			ieee80211_cqm_rssi_notify(
				&sdata->vif,
				NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
				sig, GFP_KERNEL);
		}
	}
3803 3804
}

S
Sara Sharon 已提交
3805 3806 3807 3808 3809 3810 3811 3812 3813 3814
static bool ieee80211_rx_our_beacon(const u8 *tx_bssid,
				    struct cfg80211_bss *bss)
{
	if (ether_addr_equal(tx_bssid, bss->bssid))
		return true;
	if (!bss->transmitted_bss)
		return false;
	return ether_addr_equal(tx_bssid, bss->transmitted_bss->bssid);
}

3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855
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)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
	size_t baselen;
	struct ieee802_11_elems elems;
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
	struct sta_info *sta;
	u32 changed = 0;
	bool erp_valid;
	u8 erp_value = 0;
	u32 ncrc;
	u8 *bssid;
	u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];

	sdata_assert_lock(sdata);

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

	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		rcu_read_unlock();
		return;
	}

	if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
		rcu_read_unlock();
		return;
	}
	chan = chanctx_conf->def.chan;
	rcu_read_unlock();

	if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
S
Sara Sharon 已提交
3856
	    ieee80211_rx_our_beacon(mgmt->bssid, ifmgd->assoc_data->bss)) {
3857
		ieee802_11_parse_elems(mgmt->u.beacon.variable,
3858 3859 3860
				       len - baselen, false, &elems,
				       mgmt->bssid,
				       ifmgd->assoc_data->bss->bssid);
3861

3862
		ieee80211_rx_bss_info(sdata, mgmt, len, rx_status);
S
Sara Sharon 已提交
3863 3864 3865

		if (elems.dtim_period)
			ifmgd->dtim_period = elems.dtim_period;
3866 3867 3868 3869 3870 3871 3872
		ifmgd->have_beacon = true;
		ifmgd->assoc_data->need_beacon = false;
		if (ieee80211_hw_check(&local->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;
S
Sara Sharon 已提交
3873
			sdata->vif.bss_conf.sync_dtim_count = elems.dtim_count;
3874
		}
S
Sara Sharon 已提交
3875 3876 3877 3878 3879 3880 3881 3882 3883

		if (elems.mbssid_config_ie)
			bss_conf->profile_periodicity =
				elems.mbssid_config_ie->profile_periodicity;

		if (elems.ext_capab_len >= 11 &&
		    (elems.ext_capab[10] & WLAN_EXT_CAPA11_EMA_SUPPORT))
			bss_conf->ema_ap = true;

3884 3885 3886 3887 3888 3889 3890 3891
		/* continue assoc process */
		ifmgd->assoc_data->timeout = jiffies;
		ifmgd->assoc_data->timeout_started = true;
		run_again(sdata, ifmgd->assoc_data->timeout);
		return;
	}

	if (!ifmgd->associated ||
S
Sara Sharon 已提交
3892
	    !ieee80211_rx_our_beacon(mgmt->bssid,  ifmgd->associated))
3893 3894 3895 3896 3897 3898
		return;
	bssid = ifmgd->associated->bssid;

	if (!(rx_status->flag & RX_FLAG_NO_SIGNAL_VAL))
		ieee80211_handle_beacon_sig(sdata, ifmgd, bss_conf,
					    local, rx_status);
3899

3900
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
J
Johannes Berg 已提交
3901
		mlme_dbg_ratelimited(sdata,
3902
				     "cancelling AP probe due to a received beacon\n");
3903
		ieee80211_reset_ap_probe(sdata);
3904 3905
	}

J
Johannes Berg 已提交
3906 3907 3908 3909
	/*
	 * Push the beacon loss detection into the future since
	 * we are processing a beacon from the AP just now.
	 */
3910
	ieee80211_sta_reset_beacon_monitor(sdata);
J
Johannes Berg 已提交
3911

3912 3913
	ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
	ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3914
					  len - baselen, false, &elems,
3915 3916
					  care_about_ies, ncrc,
					  mgmt->bssid, bssid);
3917

3918 3919 3920 3921 3922 3923 3924
	if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
	    ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
		if (local->hw.conf.dynamic_ps_timeout > 0) {
			if (local->hw.conf.flags & IEEE80211_CONF_PS) {
				local->hw.conf.flags &= ~IEEE80211_CONF_PS;
				ieee80211_hw_config(local,
						    IEEE80211_CONF_CHANGE_PS);
3925
			}
3926
			ieee80211_send_nullfunc(local, sdata, false);
3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938
		} else if (!local->pspolling && sdata->u.mgd.powersave) {
			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);
3939 3940
		}
	}
J
Johannes Berg 已提交
3941

3942 3943
	if (sdata->vif.p2p ||
	    sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
J
Janusz Dziedzic 已提交
3944
		struct ieee80211_p2p_noa_attr noa = {};
3945 3946 3947 3948 3949
		int ret;

		ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
					    len - baselen,
					    IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3950
					    (u8 *) &noa, sizeof(noa));
J
Janusz Dziedzic 已提交
3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966
		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));
3967 3968 3969 3970 3971
			changed |= BSS_CHANGED_P2P_PS;
			ifmgd->beacon_crc_valid = false;
		}
	}

3972 3973 3974
	if (ifmgd->csa_waiting_bcn)
		ieee80211_chswitch_post_beacon(sdata);

3975 3976 3977 3978 3979 3980 3981 3982
	/*
	 * Update beacon timing and dtim count on every beacon appearance. This
	 * will allow the driver to use the most updated values. Do it before
	 * comparing this one with last received beacon.
	 * IMPORTANT: These parameters would possibly be out of sync by the time
	 * the driver will use them. The synchronized view is currently
	 * guaranteed only in certain callbacks.
	 */
3983
	if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3984 3985 3986 3987
		sdata->vif.bss_conf.sync_tsf =
			le64_to_cpu(mgmt->u.beacon.timestamp);
		sdata->vif.bss_conf.sync_device_ts =
			rx_status->device_timestamp;
S
Sara Sharon 已提交
3988
		sdata->vif.bss_conf.sync_dtim_count = elems.dtim_count;
3989 3990
	}

3991
	if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3992
		return;
3993
	ifmgd->beacon_crc = ncrc;
3994
	ifmgd->beacon_crc_valid = true;
3995

3996
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status);
3997

3998
	ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3999
					 rx_status->device_timestamp,
4000 4001
					 &elems, true);

4002 4003
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
	    ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
L
Luca Coelho 已提交
4004 4005
				     elems.wmm_param_len,
				     elems.mu_edca_param_set))
4006 4007
		changed |= BSS_CHANGED_QOS;

4008 4009
	/*
	 * If we haven't had a beacon before, tell the driver about the
4010
	 * DTIM period (and beacon timing if desired) now.
4011
	 */
4012
	if (!ifmgd->have_beacon) {
4013
		/* a few bogus AP send dtim_period = 0 or no TIM IE */
S
Sara Sharon 已提交
4014
		bss_conf->dtim_period = elems.dtim_period ?: 1;
4015

4016 4017
		changed |= BSS_CHANGED_BEACON_INFO;
		ifmgd->have_beacon = true;
4018 4019

		mutex_lock(&local->iflist_mtx);
J
Johannes Berg 已提交
4020
		ieee80211_recalc_ps(local);
4021 4022
		mutex_unlock(&local->iflist_mtx);

4023
		ieee80211_recalc_ps_vif(sdata);
4024 4025
	}

4026
	if (elems.erp_info) {
J
Johannes Berg 已提交
4027 4028 4029 4030
		erp_valid = true;
		erp_value = elems.erp_info[0];
	} else {
		erp_valid = false;
4031
	}
J
Johannes Berg 已提交
4032 4033 4034
	changed |= ieee80211_handle_bss_capability(sdata,
			le16_to_cpu(mgmt->u.beacon.capab_info),
			erp_valid, erp_value);
4035

4036
	mutex_lock(&local->sta_mtx);
4037 4038
	sta = sta_info_get(sdata, bssid);

4039 4040
	changed |= ieee80211_recalc_twt_req(sdata, sta, &elems);

4041 4042
	if (ieee80211_config_bw(sdata, sta,
				elems.ht_cap_elem, elems.ht_operation,
L
Luca Coelho 已提交
4043 4044
				elems.vht_operation, elems.he_operation,
				bssid, &changed)) {
4045
		mutex_unlock(&local->sta_mtx);
4046 4047 4048
		sdata_info(sdata,
			   "failed to follow AP %pM bandwidth change, disconnect\n",
			   bssid);
4049 4050 4051
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_DEAUTH_LEAVING,
				       true, deauth_buf);
4052 4053 4054
		ieee80211_report_disconnect(sdata, deauth_buf,
					    sizeof(deauth_buf), true,
					    WLAN_REASON_DEAUTH_LEAVING);
4055
		return;
4056
	}
4057 4058 4059

	if (sta && elems.opmode_notif)
		ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
4060
					    rx_status->band);
4061
	mutex_unlock(&local->sta_mtx);
4062

4063 4064 4065
	changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
					       elems.country_elem,
					       elems.country_elem_len,
4066 4067
					       elems.pwr_constr_elem,
					       elems.cisco_dtpc_elem);
4068

4069
	ieee80211_bss_info_change_notify(sdata, changed);
4070 4071
}

4072 4073
void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
				  struct sk_buff *skb)
4074 4075 4076 4077
{
	struct ieee80211_rx_status *rx_status;
	struct ieee80211_mgmt *mgmt;
	u16 fc;
4078 4079
	struct ieee802_11_elems elems;
	int ies_len;
4080 4081 4082 4083 4084

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

4085
	sdata_lock(sdata);
4086

J
Johannes Berg 已提交
4087 4088
	switch (fc & IEEE80211_FCTL_STYPE) {
	case IEEE80211_STYPE_BEACON:
4089
		ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
J
Johannes Berg 已提交
4090 4091 4092 4093 4094
		break;
	case IEEE80211_STYPE_PROBE_RESP:
		ieee80211_rx_mgmt_probe_resp(sdata, skb);
		break;
	case IEEE80211_STYPE_AUTH:
4095
		ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
4096 4097
		break;
	case IEEE80211_STYPE_DEAUTH:
4098
		ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
4099 4100
		break;
	case IEEE80211_STYPE_DISASSOC:
4101
		ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
4102 4103 4104
		break;
	case IEEE80211_STYPE_ASSOC_RESP:
	case IEEE80211_STYPE_REASSOC_RESP:
4105
		ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
4106 4107
		break;
	case IEEE80211_STYPE_ACTION:
4108
		if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
4109 4110 4111
			ies_len = skb->len -
				  offsetof(struct ieee80211_mgmt,
					   u.action.u.chan_switch.variable);
4112 4113 4114 4115

			if (ies_len < 0)
				break;

4116
			/* CSA IE cannot be overridden, no need for BSSID */
4117 4118
			ieee802_11_parse_elems(
				mgmt->u.action.u.chan_switch.variable,
4119
				ies_len, true, &elems, mgmt->bssid, NULL);
4120 4121 4122 4123

			if (elems.parse_error)
				break;

4124
			ieee80211_sta_process_chanswitch(sdata,
4125 4126 4127
						 rx_status->mactime,
						 rx_status->device_timestamp,
						 &elems, false);
4128 4129 4130 4131 4132 4133 4134 4135
		} 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;

4136 4137 4138 4139
			/*
			 * extended CSA IE can't be overridden, no need for
			 * BSSID
			 */
4140 4141
			ieee802_11_parse_elems(
				mgmt->u.action.u.ext_chan_switch.variable,
4142
				ies_len, true, &elems, mgmt->bssid, NULL);
4143 4144 4145 4146 4147 4148 4149 4150

			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
4151
			ieee80211_sta_process_chanswitch(sdata,
4152 4153 4154
						 rx_status->mactime,
						 rx_status->device_timestamp,
						 &elems, false);
4155
		}
4156
		break;
4157
	}
4158
	sdata_unlock(sdata);
4159 4160
}

4161
static void ieee80211_sta_timer(struct timer_list *t)
4162
{
J
Johannes Berg 已提交
4163
	struct ieee80211_sub_if_data *sdata =
4164
		from_timer(sdata, t, u.mgd.timer);
4165

4166
	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
4167 4168
}

4169
static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
4170
					  u8 *bssid, u8 reason, bool tx)
4171
{
4172
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4173

4174
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
4175
			       tx, frame_buf);
4176

4177 4178
	ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
				    reason);
4179 4180
}

4181
static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
4182 4183 4184 4185
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
4186
	u32 tx_flags = 0;
4187 4188
	u16 trans = 1;
	u16 status = 0;
4189
	u16 prepare_tx_duration = 0;
J
Johannes Berg 已提交
4190

4191
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
4192 4193 4194 4195 4196 4197 4198

	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
4199 4200
		sdata_info(sdata, "authentication with %pM timed out\n",
			   auth_data->bss->bssid);
J
Johannes Berg 已提交
4201 4202 4203 4204 4205 4206 4207 4208 4209 4210

		/*
		 * 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;
	}

4211 4212 4213 4214 4215
	if (auth_data->algorithm == WLAN_AUTH_SAE)
		prepare_tx_duration =
			jiffies_to_msecs(IEEE80211_AUTH_TIMEOUT_SAE);

	drv_mgd_prepare_tx(local, sdata, prepare_tx_duration);
J
Johannes Berg 已提交
4216

4217 4218 4219
	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
4220

4221
	auth_data->expected_transaction = 2;
4222

4223 4224 4225 4226 4227
	if (auth_data->algorithm == WLAN_AUTH_SAE) {
		trans = auth_data->sae_trans;
		status = auth_data->sae_status;
		auth_data->expected_transaction = trans;
	}
J
Johannes Berg 已提交
4228

4229 4230 4231
	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
		tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
			   IEEE80211_TX_INTFL_MLME_CONN_TX;
J
Johannes Berg 已提交
4232

4233 4234 4235 4236 4237
	ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
			    auth_data->data, auth_data->data_len,
			    auth_data->bss->bssid,
			    auth_data->bss->bssid, NULL, 0, 0,
			    tx_flags);
J
Johannes Berg 已提交
4238

4239
	if (tx_flags == 0) {
4240 4241 4242 4243 4244
		if (auth_data->algorithm == WLAN_AUTH_SAE)
			auth_data->timeout = jiffies +
				IEEE80211_AUTH_TIMEOUT_SAE;
		else
			auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
4245
	} else {
4246 4247
		auth_data->timeout =
			round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
4248
	}
J
Johannes Berg 已提交
4249

4250 4251 4252
	auth_data->timeout_started = true;
	run_again(sdata, auth_data->timeout);

J
Johannes Berg 已提交
4253 4254 4255 4256 4257 4258 4259 4260
	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;

4261
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
4262 4263 4264

	assoc_data->tries++;
	if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
J
Johannes Berg 已提交
4265 4266
		sdata_info(sdata, "association with %pM timed out\n",
			   assoc_data->bss->bssid);
J
Johannes Berg 已提交
4267 4268 4269 4270 4271 4272 4273 4274 4275 4276

		/*
		 * 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
4277 4278 4279
	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
4280 4281
	ieee80211_send_assoc(sdata);

4282
	if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
4283
		assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
4284
		assoc_data->timeout_started = true;
4285
		run_again(sdata, assoc_data->timeout);
4286
	} else {
4287 4288 4289 4290 4291
		assoc_data->timeout =
			round_jiffies_up(jiffies +
					 IEEE80211_ASSOC_TIMEOUT_LONG);
		assoc_data->timeout_started = true;
		run_again(sdata, assoc_data->timeout);
4292
	}
J
Johannes Berg 已提交
4293 4294 4295 4296

	return 0;
}

4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308
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);
}

4309
void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
4310 4311
{
	struct ieee80211_local *local = sdata->local;
4312
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
4313

4314
	sdata_lock(sdata);
4315

4316 4317 4318 4319 4320
	if (ifmgd->status_received) {
		__le16 fc = ifmgd->status_fc;
		bool status_acked = ifmgd->status_acked;

		ifmgd->status_received = false;
4321
		if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
4322
			if (status_acked) {
4323 4324 4325 4326 4327 4328 4329 4330 4331
				if (ifmgd->auth_data->algorithm ==
				    WLAN_AUTH_SAE)
					ifmgd->auth_data->timeout =
						jiffies +
						IEEE80211_AUTH_TIMEOUT_SAE;
				else
					ifmgd->auth_data->timeout =
						jiffies +
						IEEE80211_AUTH_TIMEOUT_SHORT;
4332
				run_again(sdata, ifmgd->auth_data->timeout);
4333 4334 4335
			} else {
				ifmgd->auth_data->timeout = jiffies - 1;
			}
4336
			ifmgd->auth_data->timeout_started = true;
4337 4338 4339 4340 4341 4342
		} 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;
4343
				run_again(sdata, ifmgd->assoc_data->timeout);
4344 4345 4346
			} else {
				ifmgd->assoc_data->timeout = jiffies - 1;
			}
4347
			ifmgd->assoc_data->timeout_started = true;
4348 4349 4350
		}
	}

4351
	if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
J
Johannes Berg 已提交
4352 4353 4354 4355 4356 4357 4358
	    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);
4359
		} else if (ieee80211_auth(sdata)) {
J
Johannes Berg 已提交
4360
			u8 bssid[ETH_ALEN];
4361 4362 4363 4364 4365
			struct ieee80211_event event = {
				.type = MLME_EVENT,
				.u.mlme.data = AUTH_EVENT,
				.u.mlme.status = MLME_TIMEOUT,
			};
J
Johannes Berg 已提交
4366 4367 4368 4369 4370

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

			ieee80211_destroy_auth_data(sdata, false);

4371
			cfg80211_auth_timeout(sdata->dev, bssid);
4372
			drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
4373
		}
4374
	} else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
4375
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
4376

4377
	if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
J
Johannes Berg 已提交
4378
	    time_after(jiffies, ifmgd->assoc_data->timeout)) {
4379
		if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
J
Johannes Berg 已提交
4380
		    ieee80211_do_assoc(sdata)) {
4381
			struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4382 4383 4384 4385 4386
			struct ieee80211_event event = {
				.type = MLME_EVENT,
				.u.mlme.data = ASSOC_EVENT,
				.u.mlme.status = MLME_TIMEOUT,
			};
J
Johannes Berg 已提交
4387

4388
			ieee80211_destroy_assoc_data(sdata, false, false);
4389
			cfg80211_assoc_timeout(sdata->dev, bss);
4390
			drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
4391
		}
4392
	} else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
4393
		run_again(sdata, ifmgd->assoc_data->timeout);
J
Johannes Berg 已提交
4394

4395
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
J
Johannes Berg 已提交
4396
	    ifmgd->associated) {
4397
		u8 bssid[ETH_ALEN];
4398
		int max_tries;
4399

4400
		memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4401

4402
		if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
4403
			max_tries = max_nullfunc_tries;
4404
		else
4405
			max_tries = max_probe_tries;
4406

4407 4408 4409
		/* ACK received for nullfunc probing frame */
		if (!ifmgd->probe_send_count)
			ieee80211_reset_ap_probe(sdata);
4410 4411
		else if (ifmgd->nullfunc_failed) {
			if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
4412 4413 4414 4415
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
					 bssid, ifmgd->probe_send_count,
					 max_tries);
4416 4417
				ieee80211_mgd_probe_ap_send(sdata);
			} else {
J
Johannes Berg 已提交
4418 4419 4420
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
					 bssid);
4421
				ieee80211_sta_connection_lost(sdata, bssid,
4422 4423
					WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
					false);
4424 4425
			}
		} else if (time_is_after_jiffies(ifmgd->probe_timeout))
4426
			run_again(sdata, ifmgd->probe_timeout);
4427
		else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
J
Johannes Berg 已提交
4428 4429 4430
			mlme_dbg(sdata,
				 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
				 bssid, probe_wait_ms);
4431
			ieee80211_sta_connection_lost(sdata, bssid,
4432
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
4433
		} else if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
4434 4435 4436 4437
			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);
4438 4439
			ieee80211_mgd_probe_ap_send(sdata);
		} else {
J
Johannes Berg 已提交
4440 4441 4442 4443
			/*
			 * We actually lost the connection ... or did we?
			 * Let's make sure!
			 */
4444 4445 4446
			mlme_dbg(sdata,
				 "No probe response from AP %pM after %dms, disconnecting.\n",
				 bssid, probe_wait_ms);
4447

4448
			ieee80211_sta_connection_lost(sdata, bssid,
4449
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
J
Johannes Berg 已提交
4450 4451 4452
		}
	}

4453
	sdata_unlock(sdata);
4454 4455
}

4456
static void ieee80211_sta_bcn_mon_timer(struct timer_list *t)
J
Johannes Berg 已提交
4457 4458
{
	struct ieee80211_sub_if_data *sdata =
4459
		from_timer(sdata, t, u.mgd.bcn_mon_timer);
4460
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
4461

4462
	if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
M
Michal Kazior 已提交
4463 4464
		return;

4465
	sdata->u.mgd.connection_loss = false;
4466 4467
	ieee80211_queue_work(&sdata->local->hw,
			     &sdata->u.mgd.beacon_connection_loss_work);
J
Johannes Berg 已提交
4468 4469
}

4470
static void ieee80211_sta_conn_mon_timer(struct timer_list *t)
J
Johannes Berg 已提交
4471 4472
{
	struct ieee80211_sub_if_data *sdata =
4473
		from_timer(sdata, t, u.mgd.conn_mon_timer);
J
Johannes Berg 已提交
4474 4475 4476
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_local *local = sdata->local;

4477
	if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
M
Michal Kazior 已提交
4478 4479
		return;

4480
	ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
J
Johannes Berg 已提交
4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491
}

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
4492 4493
static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
4494
	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4495
		__ieee80211_stop_poll(sdata);
4496

J
Johannes Berg 已提交
4497
		/* let's probe the connection once */
4498
		if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4499 4500
			ieee80211_queue_work(&sdata->local->hw,
					     &sdata->u.mgd.monitor_work);
4501
	}
J
Johannes Berg 已提交
4502
}
4503

4504
#ifdef CONFIG_PM
4505 4506 4507 4508 4509 4510 4511
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);

4512 4513 4514 4515 4516
	if (ifmgd->auth_data || ifmgd->assoc_data) {
		const u8 *bssid = ifmgd->auth_data ?
				ifmgd->auth_data->bss->bssid :
				ifmgd->assoc_data->bss->bssid;

4517
		/*
4518 4519 4520
		 * 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.
4521
		 */
4522
		ieee80211_send_deauth_disassoc(sdata, bssid, bssid,
4523 4524 4525
					       IEEE80211_STYPE_DEAUTH,
					       WLAN_REASON_DEAUTH_LEAVING,
					       false, frame_buf);
4526
		if (ifmgd->assoc_data)
4527
			ieee80211_destroy_assoc_data(sdata, false, true);
4528 4529
		if (ifmgd->auth_data)
			ieee80211_destroy_auth_data(sdata, false);
4530 4531 4532 4533
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
	}

4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561
	/* This is a bit of a hack - we should find a better and more generic
	 * solution to this. Normally when suspending, cfg80211 will in fact
	 * deauthenticate. However, it doesn't (and cannot) stop an ongoing
	 * auth (not so important) or assoc (this is the problem) process.
	 *
	 * As a consequence, it can happen that we are in the process of both
	 * associating and suspending, and receive an association response
	 * after cfg80211 has checked if it needs to disconnect, but before
	 * we actually set the flag to drop incoming frames. This will then
	 * cause the workqueue flush to process the association response in
	 * the suspend, resulting in a successful association just before it
	 * tries to remove the interface from the driver, which now though
	 * has a channel context assigned ... this results in issues.
	 *
	 * To work around this (for now) simply deauth here again if we're
	 * now connected.
	 */
	if (ifmgd->associated && !sdata->local->wowlan) {
		u8 bssid[ETH_ALEN];
		struct cfg80211_deauth_request req = {
			.reason_code = WLAN_REASON_DEAUTH_LEAVING,
			.bssid = bssid,
		};

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

4562 4563 4564
	sdata_unlock(sdata);
}

4565 4566 4567 4568
void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

4569
	sdata_lock(sdata);
4570
	if (!ifmgd->associated) {
4571
		sdata_unlock(sdata);
4572 4573 4574 4575 4576 4577 4578 4579 4580 4581
		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);
4582
		sdata_unlock(sdata);
4583 4584
		return;
	}
4585
	sdata_unlock(sdata);
4586 4587 4588
}
#endif

J
Johannes Berg 已提交
4589 4590
/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4591
{
4592
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
4593

4594
	ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
4595
	INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4596
	INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4597 4598
	INIT_WORK(&ifmgd->beacon_connection_loss_work,
		  ieee80211_beacon_connection_loss_work);
4599 4600
	INIT_WORK(&ifmgd->csa_connection_drop_work,
		  ieee80211_csa_connection_drop_work);
4601
	INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4602 4603
	INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
			  ieee80211_tdls_peer_del_work);
4604 4605 4606 4607
	timer_setup(&ifmgd->timer, ieee80211_sta_timer, 0);
	timer_setup(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 0);
	timer_setup(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 0);
	timer_setup(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 0);
4608 4609
	INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
			  ieee80211_sta_handle_tspec_ac_params_wk);
J
Johannes Berg 已提交
4610

4611
	ifmgd->flags = 0;
4612
	ifmgd->powersave = sdata->wdev.ps;
4613 4614
	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
4615
	ifmgd->p2p_noa_index = -1;
J
Johannes Berg 已提交
4616

4617
	if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4618 4619 4620
		ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
	else
		ifmgd->req_smps = IEEE80211_SMPS_OFF;
4621 4622 4623 4624 4625

	/* Setup TDLS data */
	spin_lock_init(&ifmgd->teardown_lock);
	ifmgd->teardown_skb = NULL;
	ifmgd->orig_teardown_skb = NULL;
4626 4627
}

4628 4629
/* scan finished notification */
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
J
Johannes Berg 已提交
4630
{
4631
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
4632

4633 4634
	/* Restart STA timers */
	rcu_read_lock();
4635 4636 4637 4638
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (ieee80211_sdata_running(sdata))
			ieee80211_restart_sta_timer(sdata);
	}
4639 4640
	rcu_read_unlock();
}
J
Johannes Berg 已提交
4641

J
Johannes Berg 已提交
4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653
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;

4654
	ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
J
Johannes Berg 已提交
4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666
	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;

4667
	vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
J
Johannes Berg 已提交
4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685
	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;
}

L
Luca Coelho 已提交
4686 4687 4688 4689 4690 4691
static bool
ieee80211_verify_sta_he_mcs_support(struct ieee80211_supported_band *sband,
				    const struct ieee80211_he_operation *he_op)
{
	const struct ieee80211_sta_he_cap *sta_he_cap =
		ieee80211_get_he_sta_cap(sband);
4692
	u16 ap_min_req_set;
L
Luca Coelho 已提交
4693 4694 4695 4696 4697
	int i;

	if (!sta_he_cap || !he_op)
		return false;

4698 4699
	ap_min_req_set = le16_to_cpu(he_op->he_mcs_nss_set);

L
Luca Coelho 已提交
4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747
	/* Need to go over for 80MHz, 160MHz and for 80+80 */
	for (i = 0; i < 3; i++) {
		const struct ieee80211_he_mcs_nss_supp *sta_mcs_nss_supp =
			&sta_he_cap->he_mcs_nss_supp;
		u16 sta_mcs_map_rx =
			le16_to_cpu(((__le16 *)sta_mcs_nss_supp)[2 * i]);
		u16 sta_mcs_map_tx =
			le16_to_cpu(((__le16 *)sta_mcs_nss_supp)[2 * i + 1]);
		u8 nss;
		bool verified = true;

		/*
		 * For each band there is a maximum of 8 spatial streams
		 * possible. Each of the sta_mcs_map_* is a 16-bit struct built
		 * of 2 bits per NSS (1-8), with the values defined in enum
		 * ieee80211_he_mcs_support. Need to make sure STA TX and RX
		 * capabilities aren't less than the AP's minimum requirements
		 * for this HE BSS per SS.
		 * It is enough to find one such band that meets the reqs.
		 */
		for (nss = 8; nss > 0; nss--) {
			u8 sta_rx_val = (sta_mcs_map_rx >> (2 * (nss - 1))) & 3;
			u8 sta_tx_val = (sta_mcs_map_tx >> (2 * (nss - 1))) & 3;
			u8 ap_val = (ap_min_req_set >> (2 * (nss - 1))) & 3;

			if (ap_val == IEEE80211_HE_MCS_NOT_SUPPORTED)
				continue;

			/*
			 * Make sure the HE AP doesn't require MCSs that aren't
			 * supported by the client
			 */
			if (sta_rx_val == IEEE80211_HE_MCS_NOT_SUPPORTED ||
			    sta_tx_val == IEEE80211_HE_MCS_NOT_SUPPORTED ||
			    (ap_val > sta_rx_val) || (ap_val > sta_tx_val)) {
				verified = false;
				break;
			}
		}

		if (verified)
			return true;
	}

	/* If here, STA doesn't meet AP's HE min requirements */
	return false;
}

4748 4749
static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
				  struct cfg80211_bss *cbss)
4750 4751 4752
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4753
	const struct ieee80211_ht_cap *ht_cap = NULL;
4754
	const struct ieee80211_ht_operation *ht_oper = NULL;
J
Johannes Berg 已提交
4755
	const struct ieee80211_vht_operation *vht_oper = NULL;
L
Luca Coelho 已提交
4756
	const struct ieee80211_he_operation *he_oper = NULL;
4757
	struct ieee80211_supported_band *sband;
4758
	struct cfg80211_chan_def chandef;
J
Johannes Berg 已提交
4759
	int ret;
4760 4761
	u32 i;
	bool have_80mhz;
4762

4763 4764
	sband = local->hw.wiphy->bands[cbss->channel->band];

J
Johannes Berg 已提交
4765 4766 4767 4768
	ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
			  IEEE80211_STA_DISABLE_80P80MHZ |
			  IEEE80211_STA_DISABLE_160MHZ);

4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781
	/* disable HT/VHT/HE if we don't support them */
	if (!sband->ht_cap.ht_supported) {
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
		ifmgd->flags |= IEEE80211_STA_DISABLE_HE;
	}

	if (!sband->vht_cap.vht_supported)
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;

	if (!ieee80211_get_he_sta_cap(sband))
		ifmgd->flags |= IEEE80211_STA_DISABLE_HE;

4782 4783
	rcu_read_lock();

4784
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4785
		const u8 *ht_oper_ie, *ht_cap_ie;
4786

4787
		ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4788 4789
		if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
			ht_oper = (void *)(ht_oper_ie + 2);
4790

4791 4792 4793 4794 4795
		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) {
4796 4797 4798
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ht_oper = NULL;
		}
4799 4800
	}

4801
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
4802
		const u8 *vht_oper_ie, *vht_cap;
J
Johannes Berg 已提交
4803

4804 4805
		vht_oper_ie = ieee80211_bss_get_ie(cbss,
						   WLAN_EID_VHT_OPERATION);
J
Johannes Berg 已提交
4806 4807 4808 4809
		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
4810
			sdata_info(sdata,
4811
				   "AP advertised VHT without HT, disabling HT/VHT/HE\n");
4812 4813
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4814
			ifmgd->flags |= IEEE80211_STA_DISABLE_HE;
4815
		}
4816 4817 4818 4819 4820 4821

		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;
		}
4822 4823
	}

4824
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HE)) {
L
Luca Coelho 已提交
4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836
		const struct cfg80211_bss_ies *ies;
		const u8 *he_oper_ie;

		ies = rcu_dereference(cbss->ies);
		he_oper_ie = cfg80211_find_ext_ie(WLAN_EID_EXT_HE_OPERATION,
						  ies->data, ies->len);
		if (he_oper_ie &&
		    he_oper_ie[1] == ieee80211_he_oper_size(&he_oper_ie[3]))
			he_oper = (void *)(he_oper_ie + 3);
		else
			he_oper = NULL;

4837
		if (!ieee80211_verify_sta_he_mcs_support(sband, he_oper))
L
Luca Coelho 已提交
4838 4839 4840
			ifmgd->flags |= IEEE80211_STA_DISABLE_HE;
	}

4841 4842 4843 4844 4845 4846 4847 4848 4849 4850 4851 4852 4853 4854
	/* Allow VHT if at least one channel on the sband supports 80 MHz */
	have_80mhz = false;
	for (i = 0; i < sband->n_channels; i++) {
		if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
						IEEE80211_CHAN_NO_80MHZ))
			continue;

		have_80mhz = true;
		break;
	}

	if (!have_80mhz)
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;

J
Johannes Berg 已提交
4855 4856
	ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
						     cbss->channel,
L
Luca Coelho 已提交
4857
						     ht_oper, vht_oper, he_oper,
4858
						     &chandef, false);
4859

J
Johannes Berg 已提交
4860 4861
	sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
				      local->rx_chains);
4862

4863 4864
	rcu_read_unlock();

4865 4866 4867
	/* will change later if needed */
	sdata->smps_mode = IEEE80211_SMPS_OFF;

4868
	mutex_lock(&local->mtx);
J
Johannes Berg 已提交
4869 4870 4871 4872 4873 4874 4875
	/*
	 * 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);
4876 4877 4878 4879

	/* don't downgrade for 5 and 10 MHz channels, though. */
	if (chandef.width == NL80211_CHAN_WIDTH_5 ||
	    chandef.width == NL80211_CHAN_WIDTH_10)
4880
		goto out;
4881

4882
	while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4883
		ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4884 4885 4886
		ret = ieee80211_vif_use_channel(sdata, &chandef,
						IEEE80211_CHANCTX_SHARED);
	}
4887 4888
 out:
	mutex_unlock(&local->mtx);
J
Johannes Berg 已提交
4889
	return ret;
4890 4891
}

S
Sara Sharon 已提交
4892 4893 4894 4895 4896 4897 4898 4899 4900 4901 4902 4903 4904 4905 4906 4907 4908 4909 4910 4911 4912 4913 4914 4915 4916 4917 4918 4919 4920 4921 4922 4923 4924 4925
static bool ieee80211_get_dtim(const struct cfg80211_bss_ies *ies,
			       u8 *dtim_count, u8 *dtim_period)
{
	const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM, ies->data, ies->len);
	const u8 *idx_ie = cfg80211_find_ie(WLAN_EID_MULTI_BSSID_IDX, ies->data,
					 ies->len);
	const struct ieee80211_tim_ie *tim = NULL;
	const struct ieee80211_bssid_index *idx;
	bool valid = tim_ie && tim_ie[1] >= 2;

	if (valid)
		tim = (void *)(tim_ie + 2);

	if (dtim_count)
		*dtim_count = valid ? tim->dtim_count : 0;

	if (dtim_period)
		*dtim_period = valid ? tim->dtim_period : 0;

	/* Check if value is overridden by non-transmitted profile */
	if (!idx_ie || idx_ie[1] < 3)
		return valid;

	idx = (void *)(idx_ie + 2);

	if (dtim_count)
		*dtim_count = idx->dtim_count;

	if (dtim_period)
		*dtim_period = idx->dtim_period;

	return true;
}

4926
static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4927 4928
				     struct cfg80211_bss *cbss, bool assoc,
				     bool override)
4929 4930 4931 4932 4933
{
	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;
4934
	struct ieee80211_supported_band *sband;
4935
	bool have_sta = false;
4936 4937
	int err;

4938 4939
	sband = local->hw.wiphy->bands[cbss->channel->band];

4940 4941 4942
	if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
		return -EINVAL;

4943 4944 4945 4946
	/* If a reconfig is happening, bail out */
	if (local->in_reconfig)
		return -EBUSY;

4947 4948 4949 4950 4951 4952 4953 4954 4955 4956 4957
	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;
	}
4958

4959 4960 4961 4962 4963 4964 4965 4966 4967 4968 4969 4970 4971
	/*
	 * Set up the information for the new channel before setting the
	 * new channel. We can't - completely race-free - change the basic
	 * rates bitmap and the channel (sband) that it refers to, but if
	 * we set it up before we at least avoid calling into the driver's
	 * bss_info_changed() method with invalid information (since we do
	 * call that from changing the channel - only for IDLE and perhaps
	 * some others, but ...).
	 *
	 * So to avoid that, just set up all the new information before the
	 * channel, but tell the driver to apply it only afterwards, since
	 * it might need the new channel for that.
	 */
J
Johannes Berg 已提交
4972
	if (new_sta) {
4973 4974 4975
		u32 rates = 0, basic_rates = 0;
		bool have_higher_than_11mbit;
		int min_rate = INT_MAX, min_rate_index = -1;
J
Johannes Berg 已提交
4976
		const struct cfg80211_bss_ies *ies;
4977
		int shift = ieee80211_vif_get_shift(&sdata->vif);
4978 4979 4980 4981 4982

		ieee80211_get_rates(sband, bss->supp_rates,
				    bss->supp_rates_len,
				    &rates, &basic_rates,
				    &have_higher_than_11mbit,
4983
				    &min_rate, &min_rate_index,
4984
				    shift);
4985 4986 4987 4988 4989 4990 4991 4992 4993 4994

		/*
		 * 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
4995 4996
			sdata_info(sdata,
				   "No basic rates, using min rate instead\n");
4997 4998 4999
			basic_rates = BIT(min_rate_index);
		}

5000 5001 5002 5003 5004 5005
		if (rates)
			new_sta->sta.supp_rates[cbss->channel->band] = rates;
		else
			sdata_info(sdata,
				   "No rates found, keeping mandatory only\n");

5006 5007 5008
		sdata->vif.bss_conf.basic_rates = basic_rates;

		/* cf. IEEE 802.11 9.2.12 */
5009
		if (cbss->channel->band == NL80211_BAND_2GHZ &&
5010 5011 5012 5013 5014 5015 5016
		    have_higher_than_11mbit)
			sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
		else
			sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

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

5017 5018
		/* set timing information */
		sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
J
Johannes Berg 已提交
5019
		rcu_read_lock();
5020 5021 5022 5023 5024
		ies = rcu_dereference(cbss->beacon_ies);
		if (ies) {
			sdata->vif.bss_conf.sync_tsf = ies->tsf;
			sdata->vif.bss_conf.sync_device_ts =
				bss->device_ts_beacon;
S
Sara Sharon 已提交
5025 5026 5027 5028

			ieee80211_get_dtim(ies,
					   &sdata->vif.bss_conf.sync_dtim_count,
					   NULL);
5029 5030
		} else if (!ieee80211_hw_check(&sdata->local->hw,
					       TIMING_BEACON_ONLY)) {
5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041
			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
5042
		rcu_read_unlock();
5043
	}
5044

5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055 5056 5057 5058
	if (new_sta || override) {
		err = ieee80211_prep_channel(sdata, cbss);
		if (err) {
			if (new_sta)
				sta_info_free(local, new_sta);
			return -EINVAL;
		}
	}

	if (new_sta) {
		/*
		 * tell driver about BSSID, basic rates and timing
		 * this was set up above, before setting the channel
		 */
5059
		ieee80211_bss_info_change_notify(sdata,
5060 5061
			BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
			BSS_CHANGED_BEACON_INT);
5062 5063

		if (assoc)
J
Johannes Berg 已提交
5064
			sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
5065

J
Johannes Berg 已提交
5066 5067
		err = sta_info_insert(new_sta);
		new_sta = NULL;
5068
		if (err) {
J
Johannes Berg 已提交
5069 5070 5071
			sdata_info(sdata,
				   "failed to insert STA entry for the AP (error %d)\n",
				   err);
5072 5073 5074
			return err;
		}
	} else
5075
		WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
5076

5077 5078 5079 5080
	/* Cancel scan to ensure that nothing interferes with connection */
	if (local->scanning)
		ieee80211_scan_cancel(local);

5081 5082 5083
	return 0;
}

5084 5085 5086
/* config hooks */
int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
		       struct cfg80211_auth_request *req)
J
Johannes Berg 已提交
5087
{
J
Johannes Berg 已提交
5088 5089 5090
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data;
5091
	u16 auth_alg;
J
Johannes Berg 已提交
5092
	int err;
5093
	bool cont_auth;
J
Johannes Berg 已提交
5094 5095

	/* prepare auth data structure */
J
Johannes Berg 已提交
5096

5097 5098 5099 5100 5101
	switch (req->auth_type) {
	case NL80211_AUTHTYPE_OPEN_SYSTEM:
		auth_alg = WLAN_AUTH_OPEN;
		break;
	case NL80211_AUTHTYPE_SHARED_KEY:
5102
		if (fips_enabled)
5103
			return -EOPNOTSUPP;
5104 5105 5106 5107 5108 5109 5110 5111
		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;
5112 5113 5114
	case NL80211_AUTHTYPE_SAE:
		auth_alg = WLAN_AUTH_SAE;
		break;
5115 5116 5117 5118 5119 5120 5121 5122 5123
	case NL80211_AUTHTYPE_FILS_SK:
		auth_alg = WLAN_AUTH_FILS_SK;
		break;
	case NL80211_AUTHTYPE_FILS_SK_PFS:
		auth_alg = WLAN_AUTH_FILS_SK_PFS;
		break;
	case NL80211_AUTHTYPE_FILS_PK:
		auth_alg = WLAN_AUTH_FILS_PK;
		break;
5124 5125
	default:
		return -EOPNOTSUPP;
J
Johannes Berg 已提交
5126
	}
5127

5128
	if (ifmgd->assoc_data)
5129 5130
		return -EBUSY;

5131
	auth_data = kzalloc(sizeof(*auth_data) + req->auth_data_len +
5132
			    req->ie_len, GFP_KERNEL);
J
Johannes Berg 已提交
5133
	if (!auth_data)
J
Johannes Berg 已提交
5134
		return -ENOMEM;
5135

J
Johannes Berg 已提交
5136
	auth_data->bss = req->bss;
5137

5138
	if (req->auth_data_len >= 4) {
5139 5140 5141 5142 5143 5144
		if (req->auth_type == NL80211_AUTHTYPE_SAE) {
			__le16 *pos = (__le16 *) req->auth_data;

			auth_data->sae_trans = le16_to_cpu(pos[0]);
			auth_data->sae_status = le16_to_cpu(pos[1]);
		}
5145 5146 5147
		memcpy(auth_data->data, req->auth_data + 4,
		       req->auth_data_len - 4);
		auth_data->data_len += req->auth_data_len - 4;
5148 5149
	}

5150 5151 5152 5153 5154 5155 5156
	/* Check if continuing authentication or trying to authenticate with the
	 * same BSS that we were in the process of authenticating with and avoid
	 * removal and re-addition of the STA entry in
	 * ieee80211_prep_connection().
	 */
	cont_auth = ifmgd->auth_data && req->bss == ifmgd->auth_data->bss;

5157
	if (req->ie && req->ie_len) {
5158 5159 5160
		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
5161
	}
5162

J
Johannes Berg 已提交
5163
	if (req->key && req->key_len) {
J
Johannes Berg 已提交
5164 5165 5166
		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
5167 5168
	}

J
Johannes Berg 已提交
5169
	auth_data->algorithm = auth_alg;
J
Johannes Berg 已提交
5170

J
Johannes Berg 已提交
5171
	/* try to authenticate/probe */
5172

5173 5174 5175 5176 5177 5178 5179
	if (ifmgd->auth_data) {
		if (cont_auth && req->auth_type == NL80211_AUTHTYPE_SAE) {
			auth_data->peer_confirmed =
				ifmgd->auth_data->peer_confirmed;
		}
		ieee80211_destroy_auth_data(sdata, cont_auth);
	}
5180

J
Johannes Berg 已提交
5181 5182
	/* prep auth_data so we don't go into idle on disassoc */
	ifmgd->auth_data = auth_data;
J
Johannes Berg 已提交
5183

5184 5185 5186 5187 5188 5189 5190 5191 5192
	/* If this is continuation of an ongoing SAE authentication exchange
	 * (i.e., request to send SAE Confirm) and the peer has already
	 * confirmed, mark authentication completed since we are about to send
	 * out SAE Confirm.
	 */
	if (cont_auth && req->auth_type == NL80211_AUTHTYPE_SAE &&
	    auth_data->peer_confirmed && auth_data->sae_trans == 2)
		ieee80211_mark_sta_auth(sdata, req->bss->bssid);

5193 5194 5195
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

5196 5197 5198
		sdata_info(sdata,
			   "disconnect from AP %pM for new auth to %pM\n",
			   ifmgd->associated->bssid, req->bss->bssid);
5199 5200 5201 5202
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_UNSPECIFIED,
				       false, frame_buf);

5203 5204 5205
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    WLAN_REASON_UNSPECIFIED);
5206
	}
J
Johannes Berg 已提交
5207

J
Johannes Berg 已提交
5208
	sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
5209

5210
	err = ieee80211_prep_connection(sdata, req->bss, cont_auth, false);
5211
	if (err)
J
Johannes Berg 已提交
5212
		goto err_clear;
J
Johannes Berg 已提交
5213

5214
	err = ieee80211_auth(sdata);
J
Johannes Berg 已提交
5215 5216 5217 5218 5219 5220
	if (err) {
		sta_info_destroy_addr(sdata, req->bss->bssid);
		goto err_clear;
	}

	/* hold our own reference */
5221
	cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
5222
	return 0;
J
Johannes Berg 已提交
5223 5224

 err_clear:
5225
	eth_zero_addr(ifmgd->bssid);
5226
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
5227
	ifmgd->auth_data = NULL;
5228 5229 5230
	mutex_lock(&sdata->local->mtx);
	ieee80211_vif_release_channel(sdata);
	mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
5231 5232
	kfree(auth_data);
	return err;
J
Johannes Berg 已提交
5233 5234
}

5235 5236
int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
			struct cfg80211_assoc_request *req)
5237
{
J
Johannes Berg 已提交
5238
	struct ieee80211_local *local = sdata->local;
5239
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5240
	struct ieee80211_bss *bss = (void *)req->bss->priv;
J
Johannes Berg 已提交
5241
	struct ieee80211_mgd_assoc_data *assoc_data;
5242
	const struct cfg80211_bss_ies *beacon_ies;
J
Johannes Berg 已提交
5243
	struct ieee80211_supported_band *sband;
5244
	const u8 *ssidie, *ht_ie, *vht_ie;
5245
	int i, err;
5246
	bool override = false;
5247

J
Johannes Berg 已提交
5248 5249 5250 5251
	assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
	if (!assoc_data)
		return -ENOMEM;

5252 5253
	rcu_read_lock();
	ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
5254
	if (!ssidie || ssidie[1] > sizeof(assoc_data->ssid)) {
5255 5256 5257 5258 5259 5260 5261 5262
		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();

5263 5264 5265
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

5266 5267 5268
		sdata_info(sdata,
			   "disconnect from AP %pM for new assoc to %pM\n",
			   ifmgd->associated->bssid, req->bss->bssid);
5269 5270 5271 5272
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_UNSPECIFIED,
				       false, frame_buf);

5273 5274 5275
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    WLAN_REASON_UNSPECIFIED);
5276
	}
J
Johannes Berg 已提交
5277 5278 5279 5280

	if (ifmgd->auth_data && !ifmgd->auth_data->done) {
		err = -EBUSY;
		goto err_free;
J
Johannes Berg 已提交
5281
	}
5282

J
Johannes Berg 已提交
5283 5284 5285 5286
	if (ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
	}
5287

J
Johannes Berg 已提交
5288 5289 5290 5291
	if (ifmgd->auth_data) {
		bool match;

		/* keep sta info, bssid if matching */
5292
		match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
J
Johannes Berg 已提交
5293
		ieee80211_destroy_auth_data(sdata, match);
5294 5295
	}

J
Johannes Berg 已提交
5296
	/* prepare assoc data */
5297

5298 5299
	ifmgd->beacon_crc_valid = false;

5300 5301 5302
	assoc_data->wmm = bss->wmm_used &&
			  (local->hw.queues >= IEEE80211_NUM_ACS);

J
Johannes Berg 已提交
5303 5304 5305 5306 5307 5308 5309
	/*
	 * 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.
	 */
5310
	for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
5311 5312
		if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
5313
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
5314
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
5315
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
L
Luca Coelho 已提交
5316
			ifmgd->flags |= IEEE80211_STA_DISABLE_HE;
5317
			netdev_info(sdata->dev,
5318
				    "disabling HT/VHT/HE due to WEP/TKIP use\n");
5319 5320
		}
	}
5321

J
Johannes Berg 已提交
5322 5323
	sband = local->hw.wiphy->bands[req->bss->channel->band];

5324 5325 5326
	/* also disable HT/VHT/HE if the AP doesn't use WMM */
	if (!bss->wmm_used) {
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
5327
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
5328 5329 5330
		ifmgd->flags |= IEEE80211_STA_DISABLE_HE;
		netdev_info(sdata->dev,
			    "disabling HT/VHT/HE as WMM/QoS is not supported by the AP\n");
5331 5332
	}

B
Ben Greear 已提交
5333 5334 5335 5336
	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));

5337 5338 5339 5340
	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));

5341
	if (req->ie && req->ie_len) {
J
Johannes Berg 已提交
5342 5343 5344
		memcpy(assoc_data->ie, req->ie, req->ie_len);
		assoc_data->ie_len = req->ie_len;
	}
5345

5346 5347 5348 5349 5350 5351 5352 5353 5354 5355 5356 5357 5358 5359 5360
	if (req->fils_kek) {
		/* should already be checked in cfg80211 - so warn */
		if (WARN_ON(req->fils_kek_len > FILS_MAX_KEK_LEN)) {
			err = -EINVAL;
			goto err_free;
		}
		memcpy(assoc_data->fils_kek, req->fils_kek,
		       req->fils_kek_len);
		assoc_data->fils_kek_len = req->fils_kek_len;
	}

	if (req->fils_nonces)
		memcpy(assoc_data->fils_nonces, req->fils_nonces,
		       2 * FILS_NONCE_LEN);

J
Johannes Berg 已提交
5361
	assoc_data->bss = req->bss;
5362

J
Johannes Berg 已提交
5363 5364
	if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
		if (ifmgd->powersave)
5365
			sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
J
Johannes Berg 已提交
5366
		else
5367
			sdata->smps_mode = IEEE80211_SMPS_OFF;
J
Johannes Berg 已提交
5368
	} else
5369
		sdata->smps_mode = ifmgd->req_smps;
J
Johannes Berg 已提交
5370

J
Johannes Berg 已提交
5371 5372 5373
	assoc_data->capability = req->bss->capability;
	assoc_data->supp_rates = bss->supp_rates;
	assoc_data->supp_rates_len = bss->supp_rates_len;
5374

5375
	rcu_read_lock();
5376 5377 5378 5379 5380
	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
5381
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
5382 5383 5384 5385 5386 5387
	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;
5388
	rcu_read_unlock();
5389

5390
	if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
5391
		 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
5392 5393 5394
	     "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
		sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;

K
Kalle Valo 已提交
5395
	if (bss->wmm_used && bss->uapsd_supported &&
5396
	    (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
5397
		assoc_data->uapsd = true;
K
Kalle Valo 已提交
5398 5399
		ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
	} else {
5400
		assoc_data->uapsd = false;
K
Kalle Valo 已提交
5401 5402 5403
		ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
	}

5404
	if (req->prev_bssid)
J
Johannes Berg 已提交
5405
		memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
5406 5407 5408 5409 5410 5411 5412 5413 5414

	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;
	}

5415 5416 5417 5418 5419
	if (req->flags & ASSOC_REQ_USE_RRM)
		ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
	else
		ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;

5420 5421 5422 5423 5424
	if (req->crypto.control_port)
		ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
	else
		ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;

5425 5426
	sdata->control_port_protocol = req->crypto.control_port_ethertype;
	sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
5427 5428
	sdata->control_port_over_nl80211 =
					req->crypto.control_port_over_nl80211;
5429 5430
	sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
							sdata->vif.type);
5431

J
Johannes Berg 已提交
5432 5433 5434
	/* kick off associate process */

	ifmgd->assoc_data = assoc_data;
5435
	ifmgd->dtim_period = 0;
5436
	ifmgd->have_beacon = false;
J
Johannes Berg 已提交
5437

5438 5439 5440 5441 5442 5443 5444 5445 5446 5447 5448 5449 5450 5451 5452 5453 5454 5455 5456 5457 5458 5459 5460 5461
	/* override HT/VHT configuration only if the AP and we support it */
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
		struct ieee80211_sta_ht_cap sta_ht_cap;

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

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

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

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

	if (req->flags & ASSOC_REQ_DISABLE_HT) {
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
5462
		ifmgd->flags |= IEEE80211_STA_DISABLE_HE;
5463 5464 5465 5466 5467 5468
	}

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

	err = ieee80211_prep_connection(sdata, req->bss, true, override);
5469 5470
	if (err)
		goto err_clear;
J
Johannes Berg 已提交
5471

5472 5473
	rcu_read_lock();
	beacon_ies = rcu_dereference(req->bss->beacon_ies);
5474

5475
	if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
5476 5477 5478 5479 5480 5481 5482 5483
	    !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);
5484
		assoc_data->timeout_started = true;
5485 5486
		assoc_data->need_beacon = true;
	} else if (beacon_ies) {
S
Sara Sharon 已提交
5487
		const u8 *ie;
5488 5489
		u8 dtim_count = 0;

S
Sara Sharon 已提交
5490 5491 5492
		ieee80211_get_dtim(beacon_ies, &dtim_count,
				   &ifmgd->dtim_period);

5493
		ifmgd->have_beacon = true;
J
Johannes Berg 已提交
5494
		assoc_data->timeout = jiffies;
5495
		assoc_data->timeout_started = true;
5496

5497
		if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
5498 5499 5500 5501 5502
			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;
		}
S
Sara Sharon 已提交
5503 5504 5505 5506 5507 5508 5509 5510 5511 5512 5513

		ie = cfg80211_find_ext_ie(WLAN_EID_EXT_MULTIPLE_BSSID_CONFIGURATION,
					  beacon_ies->data, beacon_ies->len);
		if (ie && ie[1] >= 3)
			sdata->vif.bss_conf.profile_periodicity = ie[4];

		ie = cfg80211_find_ie(WLAN_EID_EXT_CAPABILITY,
				      beacon_ies->data, beacon_ies->len);
		if (ie && ie[1] >= 11 &&
		    (ie[10] & WLAN_EXT_CAPA11_EMA_SUPPORT))
			sdata->vif.bss_conf.ema_ap = true;
5514 5515
	} else {
		assoc_data->timeout = jiffies;
5516
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
5517
	}
5518 5519
	rcu_read_unlock();

5520
	run_again(sdata, assoc_data->timeout);
J
Johannes Berg 已提交
5521

P
Paul Stewart 已提交
5522 5523 5524 5525 5526 5527 5528 5529 5530 5531
	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
5532 5533
		sdata_info(sdata, "associating with AP with corrupt %s\n",
			   corrupt_type);
P
Paul Stewart 已提交
5534 5535
	}

5536
	return 0;
J
Johannes Berg 已提交
5537
 err_clear:
5538
	eth_zero_addr(ifmgd->bssid);
5539
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
5540 5541 5542 5543
	ifmgd->assoc_data = NULL;
 err_free:
	kfree(assoc_data);
	return err;
5544 5545
}

5546
int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
5547
			 struct cfg80211_deauth_request *req)
5548
{
5549
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5550
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
5551
	bool tx = !req->local_state_change;
5552

5553 5554 5555 5556 5557 5558
	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));
5559

5560
		drv_mgd_prepare_tx(sdata->local, sdata, 0);
5561
		ieee80211_send_deauth_disassoc(sdata, req->bssid, req->bssid,
5562
					       IEEE80211_STYPE_DEAUTH,
5563
					       req->reason_code, tx,
5564
					       frame_buf);
5565
		ieee80211_destroy_auth_data(sdata, false);
5566 5567 5568
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    req->reason_code);
5569

5570
		return 0;
5571 5572
	}

5573 5574 5575 5576 5577 5578 5579
	if (ifmgd->assoc_data &&
	    ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
		sdata_info(sdata,
			   "aborting association with %pM by local choice (Reason: %u=%s)\n",
			   req->bssid, req->reason_code,
			   ieee80211_get_reason_code_string(req->reason_code));

5580
		drv_mgd_prepare_tx(sdata->local, sdata, 0);
5581
		ieee80211_send_deauth_disassoc(sdata, req->bssid, req->bssid,
5582 5583 5584
					       IEEE80211_STYPE_DEAUTH,
					       req->reason_code, tx,
					       frame_buf);
5585
		ieee80211_destroy_assoc_data(sdata, false, true);
5586 5587 5588 5589 5590 5591
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    req->reason_code);
		return 0;
	}

5592 5593
	if (ifmgd->associated &&
	    ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
5594 5595 5596 5597 5598
		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));

5599 5600
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       req->reason_code, tx, frame_buf);
5601 5602 5603
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    req->reason_code);
5604 5605
		return 0;
	}
5606

5607
	return -ENOTCONN;
5608
}
5609

5610
int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
5611
			   struct cfg80211_disassoc_request *req)
J
Johannes Berg 已提交
5612
{
5613
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5614
	u8 bssid[ETH_ALEN];
5615
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
J
Johannes Berg 已提交
5616

J
Johannes Berg 已提交
5617 5618 5619 5620 5621 5622
	/*
	 * 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.
	 */
5623
	if (ifmgd->associated != req->bss)
5624 5625
		return -ENOLINK;

J
Johannes Berg 已提交
5626
	sdata_info(sdata,
5627 5628
		   "disassociating from %pM by local choice (Reason: %u=%s)\n",
		   req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
5629

5630
	memcpy(bssid, req->bss->bssid, ETH_ALEN);
5631 5632 5633
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
			       req->reason_code, !req->local_state_change,
			       frame_buf);
5634

5635 5636
	ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
				    req->reason_code);
5637

5638 5639
	return 0;
}
5640

5641
void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5642 5643 5644
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

5645 5646 5647 5648 5649 5650 5651 5652 5653 5654
	/*
	 * 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);
5655
	cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5656

5657
	sdata_lock(sdata);
5658 5659
	if (ifmgd->assoc_data) {
		struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5660
		ieee80211_destroy_assoc_data(sdata, false, false);
5661 5662
		cfg80211_assoc_timeout(sdata->dev, bss);
	}
5663 5664
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
5665 5666 5667 5668 5669 5670
	spin_lock_bh(&ifmgd->teardown_lock);
	if (ifmgd->teardown_skb) {
		kfree_skb(ifmgd->teardown_skb);
		ifmgd->teardown_skb = NULL;
		ifmgd->orig_teardown_skb = NULL;
	}
5671 5672 5673
	kfree(ifmgd->assoc_req_ies);
	ifmgd->assoc_req_ies = NULL;
	ifmgd->assoc_req_ies_len = 0;
5674
	spin_unlock_bh(&ifmgd->teardown_lock);
5675
	del_timer_sync(&ifmgd->timer);
5676
	sdata_unlock(sdata);
5677 5678
}

5679 5680
void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
			       enum nl80211_cqm_rssi_threshold_event rssi_event,
5681
			       s32 rssi_level,
5682 5683 5684 5685
			       gfp_t gfp)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

5686
	trace_api_cqm_rssi_notify(sdata, rssi_event, rssi_level);
J
Johannes Berg 已提交
5687

5688
	cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, rssi_level, gfp);
5689 5690
}
EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5691 5692 5693 5694 5695 5696 5697 5698 5699 5700

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

	trace_api_cqm_beacon_loss_notify(sdata->local, sdata);

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