mlme.c 146.3 KB
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/*
 * BSS client mode implementation
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 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
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 * Copyright 2004, Instant802 Networks, Inc.
 * Copyright 2005, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
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 * Copyright 2013-2014  Intel Mobile Communications GmbH
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 * Copyright (C) 2015 - 2017 Intel Deutschland GmbH
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 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

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#include <linux/delay.h>
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#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
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#include <linux/moduleparam.h>
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#include <linux/rtnetlink.h>
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#include <linux/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)
#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,
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			     const struct ieee80211_ht_cap *ht_cap,
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			     const struct ieee80211_ht_operation *ht_oper,
			     const struct ieee80211_vht_operation *vht_oper,
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			     struct cfg80211_chan_def *chandef, bool tracking)
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{
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	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
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	struct cfg80211_chan_def vht_chandef;
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	struct ieee80211_sta_ht_cap sta_ht_cap;
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	u32 ht_cfreq, ret;

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

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

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

	chandef->width = NL80211_CHAN_WIDTH_20;

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

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

	/* check 40 MHz support, if we have it */
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	if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
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		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;
	if (!ieee80211_chandef_vht_oper(vht_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 |
			      IEEE80211_STA_DISABLE_VHT;
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			break;
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		}

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		ret |= ieee80211_chandef_downgrade(chandef);
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	}

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

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

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

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

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

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

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

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

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

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

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/* frame sending functions */

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

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

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

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

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

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

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

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

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/* 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,
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				 struct ieee80211_supported_band *sband,
				 struct ieee80211_vht_cap *ap_vht_cap)
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{
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	struct ieee80211_local *local = sdata->local;
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	u8 *pos;
	u32 cap;
	struct ieee80211_sta_vht_cap vht_cap;
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	u32 mask, ap_bf_sts, our_bf_sts;
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	BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));

	memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
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	ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
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	/* determine capability flags */
	cap = vht_cap.cap;

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	if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
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		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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	}

540 541 542 543 544 545
	/*
	 * 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)))
546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563
		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) {
564
			if (other->vif.mu_mimo_owner) {
565 566 567 568 569 570 571
				disable_mu_mimo = true;
				break;
			}
		}
		if (disable_mu_mimo)
			cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
		else
572
			sdata->vif.mu_mimo_owner = true;
573
	}
574

575 576 577 578 579 580 581 582 583 584
	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;
	}

585
	/* reserve and fill IE */
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	pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
587 588 589
	ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
}

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static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u8 *pos, qos_info;
	size_t offset = 0, noffset;
599
	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;
604
	u32 rates = 0;
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606
	sdata_assert_lock(sdata);
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607

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	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (WARN_ON(!chanctx_conf)) {
		rcu_read_unlock();
		return;
	}
614
	chan = chanctx_conf->def.chan;
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	rcu_read_unlock();
	sband = local->hw.wiphy->bands[chan->band];
617
	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)...
		 */
626 627 628 629
		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.
		 */
636 637 638 639 640
		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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			assoc_data->ie_len + /* extra IEs */
652
			(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;

662
	if (sband->band == NL80211_BAND_2GHZ) {
663 664
		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) &&
671
	    ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
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		capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;

674 675 676
	if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
		capab |= WLAN_CAPABILITY_RADIO_MEASURE;

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677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718
	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
	memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);

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

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

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

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

	count = 0;
	for (i = 0; i < sband->n_bitrates; i++) {
		if (BIT(i) & rates) {
719 720 721
			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) {
734 735 736 737
				int rate;
				rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
						    5 * (1 << shift));
				*pos++ = (u8) rate;
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738 739 740 741
			}
		}
	}

742 743
	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 */
748 749
		 /* max tx power */
		*pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
750
	}
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751

752
	if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
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		/* TODO: get this in reg domain format */
		pos = skb_put(skb, 2 * sband->n_channels + 2);
		*pos++ = WLAN_EID_SUPPORTED_CHANNELS;
		*pos++ = 2 * sband->n_channels;
		for (i = 0; i < sband->n_channels; i++) {
			*pos++ = ieee80211_frequency_to_channel(
					sband->channels[i].center_freq);
			*pos++ = 1; /* one channel in the subband*/
		}
	}

	/* if present, add any custom IEs that go before HT */
765
	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,
776 777
			WLAN_EID_FAST_BSS_TRANSITION,	/* reassoc only */
			WLAN_EID_RIC_DATA,		/* reassoc only */
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			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
		};
780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799
		static const u8 after_ric[] = {
			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
			WLAN_EID_HT_CAPABILITY,
			WLAN_EID_BSS_COEX_2040,
			WLAN_EID_EXT_CAPABILITY,
			WLAN_EID_QOS_TRAFFIC_CAPA,
			WLAN_EID_TIM_BCAST_REQ,
			WLAN_EID_INTERWORKING,
			/* 60GHz doesn't happen right now */
			WLAN_EID_VHT_CAPABILITY,
			WLAN_EID_OPMODE_NOTIF,
		};

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

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

809
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
810
		ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
811
				    sband, chan, sdata->smps_mode);
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813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832
	/* if present, add any custom IEs that go before VHT */
	if (assoc_data->ie_len) {
		static const u8 before_vht[] = {
			WLAN_EID_SSID,
			WLAN_EID_SUPP_RATES,
			WLAN_EID_EXT_SUPP_RATES,
			WLAN_EID_PWR_CAPABILITY,
			WLAN_EID_SUPPORTED_CHANNELS,
			WLAN_EID_RSN,
			WLAN_EID_QOS_CAPA,
			WLAN_EID_RRM_ENABLED_CAPABILITIES,
			WLAN_EID_MOBILITY_DOMAIN,
			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
			WLAN_EID_HT_CAPABILITY,
			WLAN_EID_BSS_COEX_2040,
			WLAN_EID_EXT_CAPABILITY,
			WLAN_EID_QOS_TRAFFIC_CAPA,
			WLAN_EID_TIM_BCAST_REQ,
			WLAN_EID_INTERWORKING,
		};
833 834

		/* RIC already taken above, so no need to handle here anymore */
835 836 837 838 839 840 841 842
		noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
					     before_vht, ARRAY_SIZE(before_vht),
					     offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
		offset = noffset;
	}

843
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
844 845
		ieee80211_add_vht_ie(sdata, skb, sband,
				     &assoc_data->ap_vht_cap);
846

J
Johannes Berg 已提交
847
	/* if present, add any custom non-vendor IEs that go after HT */
848
	if (assoc_data->ie_len) {
J
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849 850 851 852 853 854 855 856
		noffset = ieee80211_ie_split_vendor(assoc_data->ie,
						    assoc_data->ie_len,
						    offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
		offset = noffset;
	}

857 858
	if (assoc_data->wmm) {
		if (assoc_data->uapsd) {
859 860
			qos_info = ifmgd->uapsd_queues;
			qos_info |= (ifmgd->uapsd_max_sp_len <<
J
Johannes Berg 已提交
861 862 863 864 865
				     IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
		} else {
			qos_info = 0;
		}

866
		pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
J
Johannes Berg 已提交
867 868 869
	}

	/* add any remaining custom (i.e. vendor specific here) IEs */
870
	if (assoc_data->ie_len) {
J
Johannes Berg 已提交
871 872 873 874 875
		noffset = assoc_data->ie_len;
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
	}

876 877 878 879 880 881
	if (assoc_data->fils_kek_len &&
	    fils_encrypt_assoc_req(skb, assoc_data) < 0) {
		dev_kfree_skb(skb);
		return;
	}

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Johannes Berg 已提交
882 883
	drv_mgd_prepare_tx(local, sdata);

J
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884
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
885
	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
886 887
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
						IEEE80211_TX_INTFL_MLME_CONN_TX;
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Johannes Berg 已提交
888 889 890
	ieee80211_tx_skb(sdata, skb);
}

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

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

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

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

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

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

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

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

927
	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
928 929
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;

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

933
	ieee80211_tx_skb(sdata, skb);
934 935
}

936 937 938 939 940 941 942 943 944 945 946
static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
					  struct ieee80211_sub_if_data *sdata)
{
	struct sk_buff *skb;
	struct ieee80211_hdr *nullfunc;
	__le16 fc;

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

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
947
	if (!skb)
948
		return;
949

950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965
	skb_reserve(skb, local->hw.extra_tx_headroom);

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

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

966 967 968 969 970
/* spectrum management related things */
static void ieee80211_chswitch_work(struct work_struct *work)
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
971
	struct ieee80211_local *local = sdata->local;
972
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
973
	int ret;
974

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

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

982 983
	if (!ifmgd->associated)
		goto out;
984

985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018
	if (!sdata->vif.csa_active)
		goto out;

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

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

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

		goto out;
	}

	if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
					&sdata->csa_chandef)) {
1019
		sdata_info(sdata,
1020
			   "failed to finalize channel switch, disconnecting\n");
1021 1022 1023 1024
		ieee80211_queue_work(&sdata->local->hw,
				     &ifmgd->csa_connection_drop_work);
		goto out;
	}
1025

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

1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
	ifmgd->csa_waiting_bcn = true;

	ieee80211_sta_reset_beacon_monitor(sdata);
	ieee80211_sta_reset_conn_monitor(sdata);

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

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

	sdata_assert_lock(sdata);

	WARN_ON(!sdata->vif.csa_active);
1049

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

1056 1057 1058
	sdata->vif.csa_active = false;
	ifmgd->csa_waiting_bcn = false;

1059 1060 1061 1062 1063 1064
	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);
1065
		return;
1066
	}
1067 1068

	cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1069 1070
}

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

	trace_api_chswitch_done(sdata, success);
	if (!success) {
1078 1079 1080 1081 1082 1083
		sdata_info(sdata,
			   "driver channel switch failed, disconnecting\n");
		ieee80211_queue_work(&sdata->local->hw,
				     &ifmgd->csa_connection_drop_work);
	} else {
		ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1084 1085 1086 1087
	}
}
EXPORT_SYMBOL(ieee80211_chswitch_done);

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

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

1096
static void
J
Johannes Berg 已提交
1097
ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1098 1099
				 u64 timestamp, u32 device_timestamp,
				 struct ieee802_11_elems *elems,
1100
				 bool beacon)
1101
{
1102
	struct ieee80211_local *local = sdata->local;
1103
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1104
	struct cfg80211_bss *cbss = ifmgd->associated;
1105
	struct ieee80211_chanctx_conf *conf;
J
Johannes Berg 已提交
1106
	struct ieee80211_chanctx *chanctx;
1107
	enum nl80211_band current_band;
1108
	struct ieee80211_csa_ie csa_ie;
1109
	struct ieee80211_channel_switch ch_switch;
1110
	int res;
1111

1112
	sdata_assert_lock(sdata);
1113

1114
	if (!cbss)
1115 1116
		return;

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

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

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

1134
	if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1135 1136 1137
				     IEEE80211_CHAN_DISABLED)) {
		sdata_info(sdata,
			   "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1138
			   ifmgd->associated->bssid,
1139 1140 1141
			   csa_ie.chandef.chan->center_freq,
			   csa_ie.chandef.width, csa_ie.chandef.center_freq1,
			   csa_ie.chandef.center_freq2);
1142 1143 1144 1145 1146
		ieee80211_queue_work(&local->hw,
				     &ifmgd->csa_connection_drop_work);
		return;
	}

1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157
	if (cfg80211_chandef_identical(&csa_ie.chandef,
				       &sdata->vif.bss_conf.chandef)) {
		if (ifmgd->csa_ignored_same_chan)
			return;
		sdata_info(sdata,
			   "AP %pM tries to chanswitch to same channel, ignore\n",
			   ifmgd->associated->bssid);
		ifmgd->csa_ignored_same_chan = true;
		return;
	}

1158 1159 1160 1161 1162 1163 1164 1165
	/*
	 * 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);

1166
	mutex_lock(&local->mtx);
1167
	mutex_lock(&local->chanctx_mtx);
1168 1169 1170 1171 1172
	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");
1173
		goto drop_connection;
1174 1175 1176 1177
	}

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

1178
	if (local->use_chanctx &&
1179
	    !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1180 1181
		sdata_info(sdata,
			   "driver doesn't support chan-switch with channel contexts\n");
1182
		goto drop_connection;
J
Johannes Berg 已提交
1183 1184
	}

1185 1186 1187 1188 1189 1190 1191 1192 1193
	ch_switch.timestamp = timestamp;
	ch_switch.device_timestamp = device_timestamp;
	ch_switch.block_tx = csa_ie.mode;
	ch_switch.chandef = csa_ie.chandef;
	ch_switch.count = csa_ie.count;

	if (drv_pre_channel_switch(sdata, &ch_switch)) {
		sdata_info(sdata,
			   "preparing for channel switch failed, disconnecting\n");
1194
		goto drop_connection;
1195 1196
	}

1197 1198 1199
	res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
					    chanctx->mode, false);
	if (res) {
J
Johannes Berg 已提交
1200
		sdata_info(sdata,
1201 1202
			   "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
			   res);
1203
		goto drop_connection;
J
Johannes Berg 已提交
1204
	}
1205
	mutex_unlock(&local->chanctx_mtx);
J
Johannes Berg 已提交
1206

1207
	sdata->vif.csa_active = true;
1208
	sdata->csa_chandef = csa_ie.chandef;
1209
	sdata->csa_block_tx = csa_ie.mode;
1210
	ifmgd->csa_ignored_same_chan = false;
J
Johannes Berg 已提交
1211

1212
	if (sdata->csa_block_tx)
1213 1214
		ieee80211_stop_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
1215
	mutex_unlock(&local->mtx);
1216

1217 1218 1219
	cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
					  csa_ie.count);

1220
	if (local->ops->channel_switch) {
1221
		/* use driver's channel switch callback */
1222
		drv_channel_switch(local, sdata, &ch_switch);
1223 1224 1225 1226
		return;
	}

	/* channel switch handled in software */
1227
	if (csa_ie.count <= 1)
1228
		ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1229
	else
1230
		mod_timer(&ifmgd->chswitch_timer,
1231 1232
			  TU_TO_EXP_TIME((csa_ie.count - 1) *
					 cbss->beacon_interval));
1233 1234 1235 1236 1237
	return;
 drop_connection:
	ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
	mutex_unlock(&local->chanctx_mtx);
	mutex_unlock(&local->mtx);
1238 1239
}

1240 1241 1242 1243 1244 1245
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)
1246
{
1247 1248
	struct ieee80211_country_ie_triplet *triplet;
	int chan = ieee80211_frequency_to_channel(channel->center_freq);
1249
	int i, chan_increment;
1250
	bool have_chan_pwr = false;
1251

1252 1253
	/* Invalid IE */
	if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1254
		return false;
1255

1256 1257 1258 1259 1260 1261 1262
	triplet = (void *)(country_ie + 3);
	country_ie_len -= 3;

	switch (channel->band) {
	default:
		WARN_ON_ONCE(1);
		/* fall through */
1263 1264
	case NL80211_BAND_2GHZ:
	case NL80211_BAND_60GHZ:
1265 1266
		chan_increment = 1;
		break;
1267
	case NL80211_BAND_5GHZ:
1268 1269
		chan_increment = 4;
		break;
1270
	}
1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281

	/* 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;
1282
				*chan_pwr = triplet->chans.max_power;
1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293
				break;
			}
		}
		if (have_chan_pwr)
			break;

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

1294
	if (have_chan_pwr && pwr_constr_elem)
1295
		*pwr_reduction = *pwr_constr_elem;
1296 1297 1298
	else
		*pwr_reduction = 0;

1299 1300 1301
	return have_chan_pwr;
}

1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315
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];
}

1316 1317 1318 1319
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,
1320 1321
				       const u8 *pwr_constr_ie,
				       const u8 *cisco_dtpc_ie)
1322
{
1323 1324 1325
	bool has_80211h_pwr = false, has_cisco_pwr = false;
	int chan_pwr = 0, pwr_reduction_80211h = 0;
	int pwr_level_cisco, pwr_level_80211h;
1326
	int new_ap_level;
1327
	__le16 capab = mgmt->u.probe_resp.capab_info;
1328

1329 1330 1331
	if (country_ie &&
	    (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
	     capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1332 1333 1334
		has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
			sdata, channel, country_ie, country_ie_len,
			pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1335 1336 1337 1338 1339 1340 1341 1342
		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;
1343
	}
1344

1345
	if (!has_80211h_pwr && !has_cisco_pwr)
1346
		return 0;
1347

1348 1349 1350 1351 1352
	/* 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)) {
1353 1354 1355 1356 1357
		new_ap_level = pwr_level_80211h;

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

1358 1359 1360 1361
		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);
1362
	} else {  /* has_cisco_pwr is always true here. */
1363 1364 1365 1366 1367
		new_ap_level = pwr_level_cisco;

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

1368 1369 1370
		sdata_dbg(sdata,
			  "Limiting TX power to %d dBm as advertised by %pM\n",
			  pwr_level_cisco, sdata->u.mgd.bssid);
1371
	}
1372

1373 1374 1375 1376
	sdata->ap_power_level = new_ap_level;
	if (__ieee80211_recalc_txpower(sdata))
		return BSS_CHANGED_TXPOWER;
	return 0;
1377 1378
}

1379 1380 1381 1382 1383 1384
/* 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
1385 1386 1387 1388
	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
1389
	if (local->scanning)
J
Johannes Berg 已提交
1390 1391
		return;

1392
	if (conf->dynamic_ps_timeout > 0 &&
1393
	    !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1394 1395 1396
		mod_timer(&local->dynamic_ps_timer, jiffies +
			  msecs_to_jiffies(conf->dynamic_ps_timeout));
	} else {
1397
		if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1398
			ieee80211_send_nullfunc(local, sdata, true);
1399

1400 1401
		if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
		    ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1402 1403 1404 1405
			return;

		conf->flags |= IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422
	}
}

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);
	}
}

1423 1424 1425 1426
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
1427
	bool authorized = false;
1428 1429 1430 1431

	if (!mgd->powersave)
		return false;

1432 1433 1434
	if (mgd->broken_ap)
		return false;

1435 1436 1437
	if (!mgd->associated)
		return false;

1438
	if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1439 1440
		return false;

1441
	if (!mgd->have_beacon)
1442 1443
		return false;

1444 1445 1446
	rcu_read_lock();
	sta = sta_info_get(sdata, mgd->bssid);
	if (sta)
J
Johannes Berg 已提交
1447
		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1448 1449
	rcu_read_unlock();

J
Johannes Berg 已提交
1450
	return authorized;
1451 1452
}

1453
/* need to hold RTNL or interface lock */
J
Johannes Berg 已提交
1454
void ieee80211_recalc_ps(struct ieee80211_local *local)
1455 1456 1457
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;
1458
	int timeout;
1459

1460
	if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1461 1462 1463 1464 1465
		local->ps_sdata = NULL;
		return;
	}

	list_for_each_entry(sdata, &local->interfaces, list) {
1466
		if (!ieee80211_sdata_running(sdata))
1467
			continue;
1468 1469 1470 1471 1472 1473 1474 1475
		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;
		}
1476 1477 1478 1479 1480 1481
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

1482
	if (count == 1 && ieee80211_powersave_allowed(found)) {
J
Johannes Berg 已提交
1483
		u8 dtimper = found->u.mgd.dtim_period;
1484

1485
		timeout = local->dynamic_ps_forced_timeout;
J
Johannes Berg 已提交
1486 1487
		if (timeout < 0)
			timeout = 100;
1488
		local->hw.conf.dynamic_ps_timeout = timeout;
1489

J
Johannes Berg 已提交
1490 1491 1492 1493 1494 1495
		/* 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;
1496
	} else {
1497
		local->ps_sdata = NULL;
1498
	}
1499 1500 1501 1502

	ieee80211_change_ps(local);
}

E
Eliad Peller 已提交
1503 1504 1505 1506 1507 1508 1509 1510 1511 1512
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);
	}
}

1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524
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,
1525
					IEEE80211_MAX_QUEUE_MAP,
1526 1527
					IEEE80211_QUEUE_STOP_REASON_PS,
					false);
1528 1529 1530 1531 1532 1533 1534 1535
}

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;
1536
	struct ieee80211_if_managed *ifmgd;
1537 1538
	unsigned long flags;
	int q;
1539 1540 1541 1542 1543

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

1544 1545
	ifmgd = &sdata->u.mgd;

1546 1547 1548
	if (local->hw.conf.flags & IEEE80211_CONF_PS)
		return;

1549
	if (local->hw.conf.dynamic_ps_timeout > 0) {
1550 1551
		/* don't enter PS if TX frames are pending */
		if (drv_tx_frames_pending(local)) {
1552 1553 1554 1555 1556
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
			return;
		}
1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574

		/*
		 * 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);
1575 1576
	}

1577
	if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1578
	    !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1579
		if (drv_tx_frames_pending(local)) {
1580 1581 1582
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
1583
		} else {
1584
			ieee80211_send_nullfunc(local, sdata, true);
1585
			/* Flush to get the tx status of nullfunc frame */
1586
			ieee80211_flush_queues(local, sdata, false);
1587
		}
1588 1589
	}

1590 1591
	if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
	      ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1592 1593 1594 1595 1596
	    (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);
	}
1597 1598 1599 1600 1601 1602
}

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

1603
	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1604 1605
}

1606 1607
void ieee80211_dfs_cac_timer_work(struct work_struct *work)
{
1608
	struct delayed_work *delayed_work = to_delayed_work(work);
1609 1610 1611
	struct ieee80211_sub_if_data *sdata =
		container_of(delayed_work, struct ieee80211_sub_if_data,
			     dfs_cac_timer_work);
1612
	struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1613

1614 1615 1616 1617 1618 1619 1620 1621
	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);
1622 1623
}

1624 1625 1626 1627 1628
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;
1629
	bool ret = false;
1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673
	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;
1674 1675 1676 1677 1678 1679
			/* 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.
1680
			 */
1681 1682
			if (non_acm_ac >= IEEE80211_NUM_ACS)
				non_acm_ac = IEEE80211_AC_BK;
1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716
			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
1717
/* MLME */
1718
static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1719
				     struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
1720
				     const u8 *wmm_param, size_t wmm_param_len)
1721
{
1722
	struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1723
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1724
	size_t left;
1725
	int count, ac;
J
Johannes Berg 已提交
1726 1727
	const u8 *pos;
	u8 uapsd_queues = 0;
1728

1729
	if (!local->ops->conf_tx)
1730
		return false;
1731

J
Johannes Berg 已提交
1732
	if (local->hw.queues < IEEE80211_NUM_ACS)
1733
		return false;
1734 1735

	if (!wmm_param)
1736
		return false;
1737

1738
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1739
		return false;
K
Kalle Valo 已提交
1740 1741

	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1742
		uapsd_queues = ifmgd->uapsd_queues;
K
Kalle Valo 已提交
1743

1744
	count = wmm_param[6] & 0x0f;
1745
	if (count == ifmgd->wmm_last_param_set)
1746
		return false;
1747
	ifmgd->wmm_last_param_set = count;
1748 1749 1750 1751 1752 1753

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

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

Y
Yoni Divinsky 已提交
1754
	sdata->wmm_acm = 0;
1755 1756 1757
	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
1758
		bool uapsd = false;
1759 1760

		switch (aci) {
1761
		case 1: /* AC_BK */
1762
			ac = IEEE80211_AC_BK;
J
Johannes Berg 已提交
1763
			if (acm)
Y
Yoni Divinsky 已提交
1764
				sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
K
Kalle Valo 已提交
1765 1766
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
				uapsd = true;
1767
			break;
1768
		case 2: /* AC_VI */
1769
			ac = IEEE80211_AC_VI;
J
Johannes Berg 已提交
1770
			if (acm)
Y
Yoni Divinsky 已提交
1771
				sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
K
Kalle Valo 已提交
1772 1773
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
				uapsd = true;
1774
			break;
1775
		case 3: /* AC_VO */
1776
			ac = IEEE80211_AC_VO;
J
Johannes Berg 已提交
1777
			if (acm)
Y
Yoni Divinsky 已提交
1778
				sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
K
Kalle Valo 已提交
1779 1780
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
				uapsd = true;
1781
			break;
1782
		case 0: /* AC_BE */
1783
		default:
1784
			ac = IEEE80211_AC_BE;
J
Johannes Berg 已提交
1785
			if (acm)
Y
Yoni Divinsky 已提交
1786
				sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
K
Kalle Valo 已提交
1787 1788
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
				uapsd = true;
1789 1790 1791
			break;
		}

1792
		params[ac].aifs = pos[0] & 0x0f;
1793

1794
		if (params[ac].aifs < 2) {
1795 1796
			sdata_info(sdata,
				   "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1797 1798
				   params[ac].aifs, aci);
			params[ac].aifs = 2;
1799
		}
1800 1801 1802 1803 1804
		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
1805

1806 1807 1808 1809 1810 1811 1812 1813 1814
		if (params[ac].cw_min > params[ac].cw_max) {
			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;
		}
	}

	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
J
Johannes Berg 已提交
1815
		mlme_dbg(sdata,
1816 1817 1818 1819 1820 1821 1822 1823
			 "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
1824
			sdata_err(sdata,
1825 1826
				  "failed to set TX queue parameters for AC %d\n",
				  ac);
1827
	}
1828 1829

	/* enable WMM or activate new settings */
1830
	sdata->vif.bss_conf.qos = true;
1831
	return true;
1832 1833
}

1834 1835 1836 1837
static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
{
	lockdep_assert_held(&sdata->local->mtx);

1838
	sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1839 1840 1841 1842 1843 1844 1845 1846 1847 1848
	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
1849 1850
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
1851
{
J
Johannes Berg 已提交
1852
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1853
	struct ieee80211_supported_band *sband;
1854
	u32 changed = 0;
J
Johannes Berg 已提交
1855 1856 1857 1858
	bool use_protection;
	bool use_short_preamble;
	bool use_short_slot;

1859 1860 1861 1862
	sband = ieee80211_get_sband(sdata);
	if (!sband)
		return changed;

J
Johannes Berg 已提交
1863 1864 1865 1866 1867 1868 1869 1870 1871
	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);
1872
	if (sband->band == NL80211_BAND_5GHZ)
1873
		use_short_slot = true;
1874

1875 1876 1877
	if (use_protection != bss_conf->use_cts_prot) {
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
1878
	}
1879

1880 1881
	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
1882
		changed |= BSS_CHANGED_ERP_PREAMBLE;
1883
	}
1884

J
Johannes Berg 已提交
1885 1886 1887
	if (use_short_slot != bss_conf->use_short_slot) {
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
1888 1889 1890 1891 1892
	}

	return changed;
}

1893
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1894
				     struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
1895
				     u32 bss_info_changed)
1896
{
1897
	struct ieee80211_bss *bss = (void *)cbss->priv;
1898
	struct ieee80211_local *local = sdata->local;
1899
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1900

J
Johannes Berg 已提交
1901
	bss_info_changed |= BSS_CHANGED_ASSOC;
1902
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1903
		bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1904

1905
	sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1906
		beacon_loss_count * bss_conf->beacon_int));
1907

1908 1909
	sdata->u.mgd.associated = cbss;
	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1910

1911 1912
	ieee80211_check_rate_mask(sdata);

1913 1914
	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;

1915 1916
	if (sdata->vif.p2p ||
	    sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
1917
		const struct cfg80211_bss_ies *ies;
1918

1919 1920 1921 1922 1923 1924 1925 1926
		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
1927 1928
					(u8 *) &bss_conf->p2p_noa_attr,
					sizeof(bss_conf->p2p_noa_attr));
1929
			if (ret >= 2) {
J
Janusz Dziedzic 已提交
1930 1931
				sdata->u.mgd.p2p_noa_index =
					bss_conf->p2p_noa_attr.index;
1932 1933
				bss_info_changed |= BSS_CHANGED_P2P_PS;
			}
1934
		}
1935
		rcu_read_unlock();
1936 1937
	}

J
Johannes Berg 已提交
1938
	/* just to be sure */
1939
	ieee80211_stop_poll(sdata);
J
Johannes Berg 已提交
1940

1941
	ieee80211_led_assoc(local, 1);
1942

1943
	if (sdata->u.mgd.have_beacon) {
1944 1945 1946 1947 1948 1949 1950
		/*
		 * 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;
1951
		bss_conf->beacon_rate = bss->beacon_rate;
1952
		bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1953
	} else {
1954
		bss_conf->beacon_rate = NULL;
1955
		bss_conf->dtim_period = 0;
1956
	}
1957

1958
	bss_conf->assoc = 1;
1959

1960
	/* Tell the driver to monitor connection quality (if supported) */
1961
	if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1962
	    bss_conf->cqm_rssi_thold)
1963 1964
		bss_info_changed |= BSS_CHANGED_CQM;

1965
	/* Enable ARP filtering */
1966
	if (bss_conf->arp_addr_cnt)
1967 1968
		bss_info_changed |= BSS_CHANGED_ARP_FILTER;

J
Johannes Berg 已提交
1969
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1970

J
Johannes Berg 已提交
1971
	mutex_lock(&local->iflist_mtx);
J
Johannes Berg 已提交
1972
	ieee80211_recalc_ps(local);
J
Johannes Berg 已提交
1973
	mutex_unlock(&local->iflist_mtx);
1974

1975
	ieee80211_recalc_smps(sdata);
E
Eliad Peller 已提交
1976 1977
	ieee80211_recalc_ps_vif(sdata);

1978
	netif_carrier_on(sdata->dev);
1979 1980
}

1981
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1982 1983
				   u16 stype, u16 reason, bool tx,
				   u8 *frame_buf)
1984
{
1985
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1986
	struct ieee80211_local *local = sdata->local;
1987
	u32 changed = 0;
1988

1989
	sdata_assert_lock(sdata);
1990

1991 1992 1993
	if (WARN_ON_ONCE(tx && !frame_buf))
		return;

J
Johannes Berg 已提交
1994 1995 1996
	if (WARN_ON(!ifmgd->associated))
		return;

1997 1998
	ieee80211_stop_poll(sdata);

1999
	ifmgd->associated = NULL;
2000 2001
	netif_carrier_off(sdata->dev);

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
	/*
	 * 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
2013 2014 2015
	/* disable per-vif ps */
	ieee80211_recalc_ps_vif(sdata);

2016 2017 2018
	/* make sure ongoing transmission finishes */
	synchronize_net();

2019 2020 2021 2022 2023 2024
	/*
	 * 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.
	 */
2025
	if (tx)
2026
		ieee80211_flush_queues(local, sdata, true);
2027

2028 2029
	/* deauthenticate/disassociate now */
	if (tx || frame_buf)
2030 2031
		ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
					       reason, tx, frame_buf);
2032

2033
	/* flush out frame - make sure the deauth was actually sent */
2034
	if (tx)
2035
		ieee80211_flush_queues(local, sdata, false);
2036

2037
	/* clear bssid only after building the needed mgmt frames */
2038
	eth_zero_addr(ifmgd->bssid);
2039

2040
	/* remove AP and TDLS peers */
2041
	sta_info_flush(sdata);
2042 2043

	/* finally reset all BSS / config parameters */
2044 2045 2046
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
J
Johannes Berg 已提交
2047 2048
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
2049

J
Janusz Dziedzic 已提交
2050 2051 2052
	ifmgd->p2p_noa_index = -1;
	memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
	       sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2053

2054
	/* on the next assoc, re-program HT/VHT parameters */
B
Ben Greear 已提交
2055 2056
	memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
	memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2057 2058
	memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
	memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2059 2060 2061 2062 2063 2064 2065

	/* 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;
2066
	sdata->vif.mu_mimo_owner = false;
2067

2068
	sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2069

2070 2071 2072
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

2073
	/* Disable ARP filtering */
2074
	if (sdata->vif.bss_conf.arp_addr_cnt)
2075 2076
		changed |= BSS_CHANGED_ARP_FILTER;

2077 2078 2079
	sdata->vif.bss_conf.qos = false;
	changed |= BSS_CHANGED_QOS;

2080 2081
	/* The BSSID (not really interesting) and HT changed */
	changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
J
Johannes Berg 已提交
2082
	ieee80211_bss_info_change_notify(sdata, changed);
2083

2084
	/* disassociated - set to defaults now */
2085
	ieee80211_set_wmm_default(sdata, false, false);
2086

2087 2088 2089 2090
	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);
2091

2092
	sdata->vif.bss_conf.dtim_period = 0;
2093 2094
	sdata->vif.bss_conf.beacon_rate = NULL;

2095
	ifmgd->have_beacon = false;
2096

2097
	ifmgd->flags = 0;
2098
	mutex_lock(&local->mtx);
2099
	ieee80211_vif_release_channel(sdata);
2100 2101

	sdata->vif.csa_active = false;
2102
	ifmgd->csa_waiting_bcn = false;
2103
	ifmgd->csa_ignored_same_chan = false;
2104 2105 2106 2107 2108
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
2109
	mutex_unlock(&local->mtx);
2110

2111 2112 2113 2114
	/* existing TX TSPEC sessions no longer exist */
	memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
	cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);

2115
	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2116
}
2117

2118 2119 2120 2121 2122 2123 2124 2125
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
2126 2127
	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
2128
	 */
J
Johannes Berg 已提交
2129 2130 2131
	if (is_multicast_ether_addr(hdr->addr1))
		return;

2132
	ieee80211_sta_reset_conn_monitor(sdata);
2133
}
2134

2135 2136 2137
static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2138
	struct ieee80211_local *local = sdata->local;
2139

2140
	mutex_lock(&local->mtx);
2141 2142
	if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
		goto out;
2143

2144
	__ieee80211_stop_poll(sdata);
2145 2146

	mutex_lock(&local->iflist_mtx);
J
Johannes Berg 已提交
2147
	ieee80211_recalc_ps(local);
2148
	mutex_unlock(&local->iflist_mtx);
2149

2150
	if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2151
		goto out;
2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162

	/*
	 * 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));
2163 2164
out:
	mutex_unlock(&local->mtx);
2165 2166
}

2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201
static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
					   struct ieee80211_hdr *hdr,
					   u16 tx_time)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
	int ac = ieee80211_ac_from_tid(tid);
	struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
	unsigned long now = jiffies;

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

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

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

	if (tx_tspec->downgraded)
		return;

	tx_tspec->consumed_tx_time += tx_time;

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

2202
void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2203
			     struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2204
{
2205 2206
	ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);

F
Felix Fietkau 已提交
2207
	if (!ieee80211_is_data(hdr->frame_control))
2208 2209 2210 2211
	    return;

	if (ieee80211_is_nullfunc(hdr->frame_control) &&
	    sdata->u.mgd.probe_send_count > 0) {
2212
		if (ack)
2213
			ieee80211_sta_reset_conn_monitor(sdata);
2214 2215
		else
			sdata->u.mgd.nullfunc_failed = true;
2216
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2217
		return;
2218
	}
2219 2220 2221

	if (ack)
		ieee80211_sta_reset_conn_monitor(sdata);
2222 2223
}

2224 2225 2226 2227
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ssid;
2228
	u8 *dst = ifmgd->associated->bssid;
2229
	u8 unicast_limit = max(1, max_probe_tries - 3);
J
Johannes Berg 已提交
2230
	struct sta_info *sta;
2231 2232 2233 2234 2235 2236 2237 2238

	/*
	 * 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;
2239

2240 2241 2242 2243 2244 2245 2246
	/*
	 * 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.
	 */
2247 2248
	ifmgd->probe_send_count++;

J
Johannes Berg 已提交
2249 2250 2251 2252 2253 2254 2255 2256
	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);
	}

2257
	if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2258
		ifmgd->nullfunc_failed = false;
2259
		ieee80211_send_nullfunc(sdata->local, sdata, false);
2260
	} else {
2261 2262
		int ssid_len;

2263
		rcu_read_lock();
2264
		ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2265 2266 2267 2268 2269
		if (WARN_ON_ONCE(ssid == NULL))
			ssid_len = 0;
		else
			ssid_len = ssid[1];

2270
		ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2271
					 ssid + 2, ssid_len, NULL,
2272
					 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
2273
					 ifmgd->associated->channel, false);
2274
		rcu_read_unlock();
2275
	}
2276

2277
	ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2278
	run_again(sdata, ifmgd->probe_timeout);
2279 2280
}

J
Johannes Berg 已提交
2281 2282
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
				   bool beacon)
2283 2284
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
2285
	bool already = false;
2286

2287
	if (!ieee80211_sdata_running(sdata))
2288 2289
		return;

2290
	sdata_lock(sdata);
2291 2292 2293 2294

	if (!ifmgd->associated)
		goto out;

2295 2296 2297 2298 2299 2300 2301
	mutex_lock(&sdata->local->mtx);

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

2302
	if (beacon) {
J
Johannes Berg 已提交
2303
		mlme_dbg_ratelimited(sdata,
2304 2305
				     "detected beacon loss from AP (missed %d beacons) - probing\n",
				     beacon_loss_count);
J
Johannes Berg 已提交
2306

2307
		ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2308
	}
2309

J
Johannes Berg 已提交
2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320
	/*
	 * 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!
	 */
2321
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
J
Johannes Berg 已提交
2322 2323
		already = true;

E
Eliad Peller 已提交
2324 2325
	ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;

2326 2327
	mutex_unlock(&sdata->local->mtx);

J
Johannes Berg 已提交
2328 2329 2330
	if (already)
		goto out;

2331
	mutex_lock(&sdata->local->iflist_mtx);
J
Johannes Berg 已提交
2332
	ieee80211_recalc_ps(sdata->local);
2333 2334
	mutex_unlock(&sdata->local->iflist_mtx);

2335 2336
	ifmgd->probe_send_count = 0;
	ieee80211_mgd_probe_ap_send(sdata);
2337
 out:
2338
	sdata_unlock(sdata);
2339 2340
}

2341 2342 2343 2344 2345
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;
2346
	struct cfg80211_bss *cbss;
2347 2348
	struct sk_buff *skb;
	const u8 *ssid;
2349
	int ssid_len;
2350 2351 2352 2353

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

2354
	sdata_assert_lock(sdata);
2355

2356 2357 2358 2359 2360 2361 2362
	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
2363 2364
		return NULL;

2365
	rcu_read_lock();
2366
	ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2367 2368 2369 2370 2371
	if (WARN_ON_ONCE(ssid == NULL))
		ssid_len = 0;
	else
		ssid_len = ssid[1];

2372
	skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
J
Johannes Berg 已提交
2373
					(u32) -1, cbss->channel,
2374
					ssid + 2, ssid_len,
2375
					NULL, 0, true);
2376
	rcu_read_unlock();
2377 2378 2379 2380 2381

	return skb;
}
EXPORT_SYMBOL(ieee80211_ap_probereq_get);

2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399
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);
}

2400
static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2401
{
2402
	struct ieee80211_local *local = sdata->local;
2403
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2404
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2405

2406
	sdata_lock(sdata);
2407
	if (!ifmgd->associated) {
2408
		sdata_unlock(sdata);
2409 2410 2411
		return;
	}

2412 2413 2414 2415 2416
	/* 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);

2417 2418
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
			       WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2419
			       true, frame_buf);
2420
	mutex_lock(&local->mtx);
2421
	sdata->vif.csa_active = false;
2422
	ifmgd->csa_waiting_bcn = false;
2423 2424 2425 2426 2427
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
2428
	mutex_unlock(&local->mtx);
2429

2430 2431 2432
	ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
				    WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);

2433
	sdata_unlock(sdata);
2434 2435
}

2436
static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
J
Johannes Berg 已提交
2437 2438 2439
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
2440
			     u.mgd.beacon_connection_loss_work);
2441 2442
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

2443 2444
	if (ifmgd->associated)
		ifmgd->beacon_loss_count++;
J
Johannes Berg 已提交
2445

2446
	if (ifmgd->connection_loss) {
2447 2448
		sdata_info(sdata, "Connection to AP %pM lost\n",
			   ifmgd->bssid);
2449
		__ieee80211_disconnect(sdata);
2450
	} else {
2451
		ieee80211_mgd_probe_ap(sdata, true);
2452 2453 2454 2455 2456 2457 2458 2459 2460
	}
}

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);

2461
	__ieee80211_disconnect(sdata);
J
Johannes Berg 已提交
2462 2463
}

2464 2465 2466
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2467
	struct ieee80211_hw *hw = &sdata->local->hw;
2468

J
Johannes Berg 已提交
2469 2470
	trace_api_beacon_loss(sdata);

2471
	sdata->u.mgd.connection_loss = false;
2472
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2473 2474 2475
}
EXPORT_SYMBOL(ieee80211_beacon_loss);

2476 2477 2478 2479 2480
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
2481 2482
	trace_api_connection_loss(sdata);

2483
	sdata->u.mgd.connection_loss = true;
2484 2485 2486 2487 2488
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_connection_loss);


J
Johannes Berg 已提交
2489 2490 2491 2492 2493
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;

2494
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2495 2496

	if (!assoc) {
2497 2498 2499 2500 2501 2502
		/*
		 * 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
2503 2504
		sta_info_destroy_addr(sdata, auth_data->bss->bssid);

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

2513
	cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
J
Johannes Berg 已提交
2514 2515 2516 2517
	kfree(auth_data);
	sdata->u.mgd.auth_data = NULL;
}

2518
static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2519
					 bool assoc, bool abandon)
2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536
{
	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;
2537 2538
		sdata->vif.mu_mimo_owner = false;

2539 2540 2541
		mutex_lock(&sdata->local->mtx);
		ieee80211_vif_release_channel(sdata);
		mutex_unlock(&sdata->local->mtx);
2542 2543 2544

		if (abandon)
			cfg80211_abandon_assoc(sdata->dev, assoc_data->bss);
2545 2546 2547 2548 2549 2550
	}

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

J
Johannes Berg 已提交
2551 2552 2553
static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
{
2554
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
2555 2556 2557
	struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
	u8 *pos;
	struct ieee802_11_elems elems;
2558
	u32 tx_flags = 0;
J
Johannes Berg 已提交
2559 2560

	pos = mgmt->u.auth.variable;
2561
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2562 2563 2564
	if (!elems.challenge)
		return;
	auth_data->expected_transaction = 4;
J
Johannes Berg 已提交
2565
	drv_mgd_prepare_tx(sdata->local, sdata);
2566
	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2567 2568
		tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
			   IEEE80211_TX_INTFL_MLME_CONN_TX;
2569
	ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
J
Johannes Berg 已提交
2570 2571 2572
			    elems.challenge - 2, elems.challenge_len + 2,
			    auth_data->bss->bssid, auth_data->bss->bssid,
			    auth_data->key, auth_data->key_len,
2573
			    auth_data->key_idx, tx_flags);
J
Johannes Berg 已提交
2574 2575
}

2576 2577
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
2578 2579 2580 2581 2582
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u8 bssid[ETH_ALEN];
	u16 auth_alg, auth_transaction, status_code;
	struct sta_info *sta;
2583 2584 2585 2586
	struct ieee80211_event event = {
		.type = MLME_EVENT,
		.u.mlme.data = AUTH_EVENT,
	};
J
Johannes Berg 已提交
2587

2588
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2589 2590

	if (len < 24 + 6)
2591
		return;
J
Johannes Berg 已提交
2592 2593

	if (!ifmgd->auth_data || ifmgd->auth_data->done)
2594
		return;
J
Johannes Berg 已提交
2595 2596 2597

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

2598
	if (!ether_addr_equal(bssid, mgmt->bssid))
2599
		return;
J
Johannes Berg 已提交
2600 2601 2602 2603 2604 2605

	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 ||
2606 2607 2608 2609 2610
	    auth_transaction != ifmgd->auth_data->expected_transaction) {
		sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
			   mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
			   auth_transaction,
			   ifmgd->auth_data->expected_transaction);
2611
		return;
2612
	}
J
Johannes Berg 已提交
2613 2614

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
2615 2616
		sdata_info(sdata, "%pM denied authentication (status %d)\n",
			   mgmt->sa, status_code);
2617
		ieee80211_destroy_auth_data(sdata, false);
2618
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2619 2620 2621
		event.u.mlme.status = MLME_DENIED;
		event.u.mlme.reason = status_code;
		drv_event_callback(sdata->local, sdata, &event);
2622
		return;
J
Johannes Berg 已提交
2623 2624 2625 2626 2627 2628
	}

	switch (ifmgd->auth_data->algorithm) {
	case WLAN_AUTH_OPEN:
	case WLAN_AUTH_LEAP:
	case WLAN_AUTH_FT:
2629
	case WLAN_AUTH_SAE:
2630 2631 2632
	case WLAN_AUTH_FILS_SK:
	case WLAN_AUTH_FILS_SK_PFS:
	case WLAN_AUTH_FILS_PK:
J
Johannes Berg 已提交
2633 2634 2635 2636 2637
		break;
	case WLAN_AUTH_SHARED_KEY:
		if (ifmgd->auth_data->expected_transaction != 4) {
			ieee80211_auth_challenge(sdata, mgmt, len);
			/* need another frame */
2638
			return;
J
Johannes Berg 已提交
2639 2640 2641 2642 2643
		}
		break;
	default:
		WARN_ONCE(1, "invalid auth alg %d",
			  ifmgd->auth_data->algorithm);
2644
		return;
J
Johannes Berg 已提交
2645 2646
	}

2647 2648
	event.u.mlme.status = MLME_SUCCESS;
	drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
2649
	sdata_info(sdata, "authenticated\n");
J
Johannes Berg 已提交
2650 2651
	ifmgd->auth_data->done = true;
	ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2652
	ifmgd->auth_data->timeout_started = true;
2653
	run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
2654

2655 2656 2657 2658 2659 2660
	if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
	    ifmgd->auth_data->expected_transaction != 2) {
		/*
		 * Report auth frame to user space for processing since another
		 * round of Authentication frames is still needed.
		 */
2661
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2662
		return;
2663 2664
	}

J
Johannes Berg 已提交
2665 2666 2667 2668 2669 2670 2671 2672
	/* move station state to auth */
	mutex_lock(&sdata->local->sta_mtx);
	sta = sta_info_get(sdata, bssid);
	if (!sta) {
		WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
		goto out_err;
	}
	if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
J
Johannes Berg 已提交
2673
		sdata_info(sdata, "failed moving %pM to auth\n", bssid);
J
Johannes Berg 已提交
2674 2675 2676 2677
		goto out_err;
	}
	mutex_unlock(&sdata->local->sta_mtx);

2678
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2679
	return;
J
Johannes Berg 已提交
2680 2681 2682 2683 2684
 out_err:
	mutex_unlock(&sdata->local->sta_mtx);
	/* ignore frame -- wait for timeout */
}

2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740
#define case_WLAN(type) \
	case WLAN_REASON_##type: return #type

static const char *ieee80211_get_reason_code_string(u16 reason_code)
{
	switch (reason_code) {
	case_WLAN(UNSPECIFIED);
	case_WLAN(PREV_AUTH_NOT_VALID);
	case_WLAN(DEAUTH_LEAVING);
	case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
	case_WLAN(DISASSOC_AP_BUSY);
	case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
	case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
	case_WLAN(DISASSOC_STA_HAS_LEFT);
	case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
	case_WLAN(DISASSOC_BAD_POWER);
	case_WLAN(DISASSOC_BAD_SUPP_CHAN);
	case_WLAN(INVALID_IE);
	case_WLAN(MIC_FAILURE);
	case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
	case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
	case_WLAN(IE_DIFFERENT);
	case_WLAN(INVALID_GROUP_CIPHER);
	case_WLAN(INVALID_PAIRWISE_CIPHER);
	case_WLAN(INVALID_AKMP);
	case_WLAN(UNSUPP_RSN_VERSION);
	case_WLAN(INVALID_RSN_IE_CAP);
	case_WLAN(IEEE8021X_FAILED);
	case_WLAN(CIPHER_SUITE_REJECTED);
	case_WLAN(DISASSOC_UNSPECIFIED_QOS);
	case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
	case_WLAN(DISASSOC_LOW_ACK);
	case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
	case_WLAN(QSTA_LEAVE_QBSS);
	case_WLAN(QSTA_NOT_USE);
	case_WLAN(QSTA_REQUIRE_SETUP);
	case_WLAN(QSTA_TIMEOUT);
	case_WLAN(QSTA_CIPHER_NOT_SUPP);
	case_WLAN(MESH_PEER_CANCELED);
	case_WLAN(MESH_MAX_PEERS);
	case_WLAN(MESH_CONFIG);
	case_WLAN(MESH_CLOSE);
	case_WLAN(MESH_MAX_RETRIES);
	case_WLAN(MESH_CONFIRM_TIMEOUT);
	case_WLAN(MESH_INVALID_GTK);
	case_WLAN(MESH_INCONSISTENT_PARAM);
	case_WLAN(MESH_INVALID_SECURITY);
	case_WLAN(MESH_PATH_ERROR);
	case_WLAN(MESH_PATH_NOFORWARD);
	case_WLAN(MESH_PATH_DEST_UNREACHABLE);
	case_WLAN(MAC_EXISTS_IN_MBSS);
	case_WLAN(MESH_CHAN_REGULATORY);
	case_WLAN(MESH_CHAN);
	default: return "<unknown>";
	}
}
J
Johannes Berg 已提交
2741

2742 2743
static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
2744
{
2745
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2746
	u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2747

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

2750
	if (len < 24 + 2)
2751
		return;
2752

2753 2754 2755
	if (ifmgd->associated &&
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
		const u8 *bssid = ifmgd->associated->bssid;
2756

2757 2758 2759
		sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
			   bssid, reason_code,
			   ieee80211_get_reason_code_string(reason_code));
2760

2761
		ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2762

2763 2764 2765 2766
		ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
					    reason_code);
		return;
	}
2767

2768 2769 2770
	if (ifmgd->assoc_data &&
	    ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
		const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2771

2772 2773 2774 2775 2776
		sdata_info(sdata,
			   "deauthenticated from %pM while associating (Reason: %u=%s)\n",
			   bssid, reason_code,
			   ieee80211_get_reason_code_string(reason_code));

2777
		ieee80211_destroy_assoc_data(sdata, false, true);
2778 2779 2780 2781

		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
		return;
	}
2782 2783 2784
}


2785 2786
static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_mgmt *mgmt, size_t len)
2787
{
2788
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2789 2790
	u16 reason_code;

2791
	sdata_assert_lock(sdata);
2792

J
Johannes Berg 已提交
2793
	if (len < 24 + 2)
2794
		return;
2795

J
Johannes Berg 已提交
2796
	if (!ifmgd->associated ||
2797
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2798
		return;
2799 2800 2801

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

2802 2803 2804
	sdata_info(sdata, "disassociated from %pM (Reason: %u=%s)\n",
		   mgmt->sa, reason_code,
		   ieee80211_get_reason_code_string(reason_code));
2805

2806 2807
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2808
	ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2809 2810
}

2811 2812 2813 2814
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,
2815
				int *min_rate, int *min_rate_index,
2816
				int shift)
2817 2818 2819 2820
{
	int i, j;

	for (i = 0; i < supp_rates_len; i++) {
2821
		int rate = supp_rates[i] & 0x7f;
2822 2823
		bool is_basic = !!(supp_rates[i] & 0x80);

2824
		if ((rate * 5 * (1 << shift)) > 110)
2825 2826 2827
			*have_higher_than_11mbit = true;

		/*
2828 2829
		 * Skip HT and VHT BSS membership selectors since they're not
		 * rates.
2830
		 *
2831
		 * Note: Even though the membership selector and the basic
2832 2833 2834
		 *	 rate flag share the same bit, they are not exactly
		 *	 the same.
		 */
2835 2836
		if (supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_HT_PHY) ||
		    supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_VHT_PHY))
2837 2838 2839
			continue;

		for (j = 0; j < sband->n_bitrates; j++) {
2840 2841 2842 2843 2844 2845 2846
			struct ieee80211_rate *br;
			int brate;

			br = &sband->bitrates[j];

			brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
			if (brate == rate) {
2847 2848 2849
				*rates |= BIT(j);
				if (is_basic)
					*basic_rates |= BIT(j);
2850 2851
				if ((rate * 5) < *min_rate) {
					*min_rate = rate * 5;
2852 2853 2854 2855 2856 2857 2858
					*min_rate_index = j;
				}
				break;
			}
		}
	}
}
2859

J
Johannes Berg 已提交
2860 2861
static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
				    struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
2862
				    struct ieee80211_mgmt *mgmt, size_t len)
2863
{
2864
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2865
	struct ieee80211_local *local = sdata->local;
2866
	struct ieee80211_supported_band *sband;
2867
	struct sta_info *sta;
J
Johannes Berg 已提交
2868 2869
	u8 *pos;
	u16 capab_info, aid;
2870
	struct ieee802_11_elems elems;
J
Johannes Berg 已提交
2871
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2872 2873
	const struct cfg80211_bss_ies *bss_ies = NULL;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
J
Johannes Berg 已提交
2874
	u32 changed = 0;
2875
	int err;
2876
	bool ret;
2877

J
Johannes Berg 已提交
2878
	/* AssocResp and ReassocResp have identical structure */
2879 2880

	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
J
Johannes Berg 已提交
2881
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2882

2883
	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
J
Johannes Berg 已提交
2884 2885
		sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
			   aid);
2886 2887
	aid &= ~(BIT(15) | BIT(14));

2888 2889 2890
	ifmgd->broken_ap = false;

	if (aid == 0 || aid > IEEE80211_MAX_AID) {
J
Johannes Berg 已提交
2891 2892
		sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
			   aid);
2893 2894 2895 2896
		aid = 0;
		ifmgd->broken_ap = true;
	}

J
Johannes Berg 已提交
2897
	pos = mgmt->u.assoc_resp.variable;
2898
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2899

2900
	if (!elems.supp_rates) {
J
Johannes Berg 已提交
2901
		sdata_info(sdata, "no SuppRates element in AssocResp\n");
J
Johannes Berg 已提交
2902
		return false;
2903 2904
	}

2905
	ifmgd->aid = aid;
2906 2907 2908
	ifmgd->tdls_chan_switch_prohibited =
		elems.ext_capab && elems.ext_capab_len >= 5 &&
		(elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2909

2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972
	/*
	 * Some APs are erroneously not including some information in their
	 * (re)association response frames. Try to recover by using the data
	 * from the beacon or probe response. This seems to afflict mobile
	 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
	 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
	 */
	if ((assoc_data->wmm && !elems.wmm_param) ||
	    (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	     (!elems.ht_cap_elem || !elems.ht_operation)) ||
	    (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	     (!elems.vht_cap_elem || !elems.vht_operation))) {
		const struct cfg80211_bss_ies *ies;
		struct ieee802_11_elems bss_elems;

		rcu_read_lock();
		ies = rcu_dereference(cbss->ies);
		if (ies)
			bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
					  GFP_ATOMIC);
		rcu_read_unlock();
		if (!bss_ies)
			return false;

		ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
				       false, &bss_elems);
		if (assoc_data->wmm &&
		    !elems.wmm_param && bss_elems.wmm_param) {
			elems.wmm_param = bss_elems.wmm_param;
			sdata_info(sdata,
				   "AP bug: WMM param missing from AssocResp\n");
		}

		/*
		 * Also check if we requested HT/VHT, otherwise the AP doesn't
		 * have to include the IEs in the (re)association response.
		 */
		if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
			elems.ht_cap_elem = bss_elems.ht_cap_elem;
			sdata_info(sdata,
				   "AP bug: HT capability missing from AssocResp\n");
		}
		if (!elems.ht_operation && bss_elems.ht_operation &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
			elems.ht_operation = bss_elems.ht_operation;
			sdata_info(sdata,
				   "AP bug: HT operation missing from AssocResp\n");
		}
		if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
			elems.vht_cap_elem = bss_elems.vht_cap_elem;
			sdata_info(sdata,
				   "AP bug: VHT capa missing from AssocResp\n");
		}
		if (!elems.vht_operation && bss_elems.vht_operation &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
			elems.vht_operation = bss_elems.vht_operation;
			sdata_info(sdata,
				   "AP bug: VHT operation missing from AssocResp\n");
		}
	}

2973 2974 2975 2976 2977 2978 2979
	/*
	 * We previously checked these in the beacon/probe response, so
	 * they should be present here. This is just a safety net.
	 */
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	    (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
		sdata_info(sdata,
2980 2981 2982
			   "HT AP is missing WMM params or HT capability/operation\n");
		ret = false;
		goto out;
2983 2984 2985 2986 2987
	}

	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    (!elems.vht_cap_elem || !elems.vht_operation)) {
		sdata_info(sdata,
2988 2989 2990
			   "VHT AP is missing VHT capability/operation\n");
		ret = false;
		goto out;
2991 2992
	}

2993 2994 2995 2996 2997
	mutex_lock(&sdata->local->sta_mtx);
	/*
	 * station info was already allocated and inserted before
	 * the association and should be available to us
	 */
2998
	sta = sta_info_get(sdata, cbss->bssid);
2999 3000
	if (WARN_ON(!sta)) {
		mutex_unlock(&sdata->local->sta_mtx);
3001 3002
		ret = false;
		goto out;
3003
	}
3004

3005 3006 3007 3008 3009 3010
	sband = ieee80211_get_sband(sdata);
	if (!sband) {
		mutex_unlock(&sdata->local->sta_mtx);
		ret = false;
		goto out;
	}
3011

3012
	/* Set up internal HT/VHT capabilities */
3013
	if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
B
Ben Greear 已提交
3014
		ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3015
						  elems.ht_cap_elem, sta);
3016

M
Mahesh Palivela 已提交
3017 3018
	if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
		ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3019
						    elems.vht_cap_elem, sta);
M
Mahesh Palivela 已提交
3020

3021 3022 3023 3024 3025 3026
	/*
	 * 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.
	 */
3027

3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042
	/*
	 * If an operating mode notification IE is present, override the
	 * NSS calculation (that would be done in rate_control_rate_init())
	 * and use the # of streams from that element.
	 */
	if (elems.opmode_notif &&
	    !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
		u8 nss;

		nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
		nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
		nss += 1;
		sta->sta.rx_nss = nss;
	}

3043
	rate_control_rate_init(sta);
3044

3045
	if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
J
Johannes Berg 已提交
3046
		set_sta_flag(sta, WLAN_STA_MFP);
3047 3048 3049 3050
		sta->sta.mfp = true;
	} else {
		sta->sta.mfp = false;
	}
3051

3052
	sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3053

3054
	err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3055 3056 3057
	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
3058 3059 3060
		sdata_info(sdata,
			   "failed to move station %pM to desired state\n",
			   sta->sta.addr);
3061 3062
		WARN_ON(__sta_info_destroy(sta));
		mutex_unlock(&sdata->local->sta_mtx);
3063 3064
		ret = false;
		goto out;
3065 3066
	}

3067
	mutex_unlock(&sdata->local->sta_mtx);
3068

3069 3070 3071 3072 3073 3074 3075 3076
	/*
	 * 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;

3077
	if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3078
		ieee80211_set_wmm_default(sdata, false, false);
3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091
	} else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
					     elems.wmm_param_len)) {
		/* 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;
	}
3092
	changed |= BSS_CHANGED_QOS;
3093

3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105
	if (elems.max_idle_period_ie) {
		bss_conf->max_idle_period =
			le16_to_cpu(elems.max_idle_period_ie->max_idle_period);
		bss_conf->protected_keep_alive =
			!!(elems.max_idle_period_ie->idle_options &
			   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
3106 3107 3108 3109
	/* set AID and assoc capability,
	 * ieee80211_set_associated() will tell the driver */
	bss_conf->aid = aid;
	bss_conf->assoc_capability = capab_info;
3110
	ieee80211_set_associated(sdata, cbss, changed);
3111

3112 3113 3114 3115 3116 3117 3118
	/*
	 * 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);

3119
	/*
J
Johannes Berg 已提交
3120 3121
	 * Start timer to probe the connection to the AP now.
	 * Also start the timer that will detect beacon loss.
3122
	 */
J
Johannes Berg 已提交
3123
	ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3124
	ieee80211_sta_reset_beacon_monitor(sdata);
3125

3126 3127 3128 3129
	ret = true;
 out:
	kfree(bss_ies);
	return ret;
3130 3131
}

3132 3133 3134
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
3135 3136 3137 3138 3139
{
	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;
3140
	int ac, uapsd_queues = -1;
J
Johannes Berg 已提交
3141 3142
	u8 *pos;
	bool reassoc;
3143
	struct cfg80211_bss *bss;
3144 3145 3146 3147
	struct ieee80211_event event = {
		.type = MLME_EVENT,
		.u.mlme.data = ASSOC_EVENT,
	};
J
Johannes Berg 已提交
3148

3149
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3150 3151

	if (!assoc_data)
3152
		return;
3153
	if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3154
		return;
J
Johannes Berg 已提交
3155 3156 3157 3158 3159 3160 3161

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

	if (len < 24 + 6)
3162
		return;
J
Johannes Berg 已提交
3163 3164 3165 3166 3167 3168

	reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
	status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);

J
Johannes Berg 已提交
3169 3170 3171 3172
	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
3173

3174 3175 3176 3177
	if (assoc_data->fils_kek_len &&
	    fils_decrypt_assoc_resp(sdata, (u8 *)mgmt, &len, assoc_data) < 0)
		return;

J
Johannes Berg 已提交
3178
	pos = mgmt->u.assoc_resp.variable;
3179
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
3180 3181

	if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3182 3183
	    elems.timeout_int &&
	    elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
J
Johannes Berg 已提交
3184
		u32 tu, ms;
3185
		tu = le32_to_cpu(elems.timeout_int->value);
J
Johannes Berg 已提交
3186
		ms = tu * 1024 / 1000;
J
Johannes Berg 已提交
3187 3188 3189
		sdata_info(sdata,
			   "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
			   mgmt->sa, tu, ms);
J
Johannes Berg 已提交
3190
		assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3191
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
3192
		if (ms > IEEE80211_ASSOC_TIMEOUT)
3193 3194
			run_again(sdata, assoc_data->timeout);
		return;
J
Johannes Berg 已提交
3195 3196
	}

3197
	bss = assoc_data->bss;
J
Johannes Berg 已提交
3198 3199

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
3200 3201
		sdata_info(sdata, "%pM denied association (code=%d)\n",
			   mgmt->sa, status_code);
3202
		ieee80211_destroy_assoc_data(sdata, false, false);
3203 3204 3205
		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
3206
	} else {
3207
		if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
J
Johannes Berg 已提交
3208
			/* oops -- internal error -- send timeout for now */
3209
			ieee80211_destroy_assoc_data(sdata, false, false);
3210
			cfg80211_assoc_timeout(sdata->dev, bss);
3211
			return;
J
Johannes Berg 已提交
3212
		}
3213 3214
		event.u.mlme.status = MLME_SUCCESS;
		drv_event_callback(sdata->local, sdata, &event);
3215
		sdata_info(sdata, "associated\n");
3216 3217 3218 3219 3220 3221

		/*
		 * 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
		 */
3222
		ieee80211_destroy_assoc_data(sdata, true, false);
3223 3224 3225 3226 3227

		/* get uapsd queues configuration */
		uapsd_queues = 0;
		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
			if (sdata->tx_conf[ac].uapsd)
3228
				uapsd_queues |= ieee80211_ac_to_qos_mask[ac];
J
Johannes Berg 已提交
3229 3230
	}

3231
	cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
J
Johannes Berg 已提交
3232
}
J
Johannes Berg 已提交
3233

3234
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
3235
				  struct ieee80211_mgmt *mgmt, size_t len,
3236
				  struct ieee80211_rx_status *rx_status,
3237
				  struct ieee802_11_elems *elems)
3238 3239
{
	struct ieee80211_local *local = sdata->local;
3240
	struct ieee80211_bss *bss;
3241
	struct ieee80211_channel *channel;
3242

3243
	sdata_assert_lock(sdata);
3244

3245 3246
	channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
	if (!channel)
3247 3248 3249
		return;

	bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3250
					channel);
3251 3252
	if (bss) {
		sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3253
		ieee80211_rx_bss_put(local, bss);
3254
	}
3255 3256 3257
}


3258
static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
3259
					 struct sk_buff *skb)
3260
{
J
Johannes Berg 已提交
3261
	struct ieee80211_mgmt *mgmt = (void *)skb->data;
3262
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
3263 3264
	struct ieee80211_rx_status *rx_status = (void *) skb->cb;
	size_t baselen, len = skb->len;
3265 3266
	struct ieee802_11_elems elems;

3267 3268
	ifmgd = &sdata->u.mgd;

3269
	sdata_assert_lock(sdata);
3270

3271
	if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3272 3273
		return; /* ignore ProbeResp to foreign address */

3274 3275 3276 3277 3278
	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
	if (baselen > len)
		return;

	ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3279
			       false, &elems);
3280

3281
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3282

3283
	if (ifmgd->associated &&
3284
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3285
		ieee80211_reset_ap_probe(sdata);
3286 3287
}

3288 3289 3290
/*
 * This is the canonical list of information elements we care about,
 * the filter code also gives us all changes to the Microsoft OUI
3291 3292 3293
 * (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.
3294 3295 3296 3297 3298 3299 3300 3301 3302 3303
 *
 * 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 =
3304 3305 3306 3307 3308
	(1ULL << WLAN_EID_COUNTRY) |
	(1ULL << WLAN_EID_ERP_INFO) |
	(1ULL << WLAN_EID_CHANNEL_SWITCH) |
	(1ULL << WLAN_EID_PWR_CONSTRAINT) |
	(1ULL << WLAN_EID_HT_CAPABILITY) |
3309 3310
	(1ULL << WLAN_EID_HT_OPERATION) |
	(1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3311

3312 3313 3314
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)
3315
{
3316
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3317
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3318 3319
	size_t baselen;
	struct ieee802_11_elems elems;
3320
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
3321 3322
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
3323
	struct sta_info *sta;
3324
	u32 changed = 0;
3325
	bool erp_valid;
J
Johannes Berg 已提交
3326
	u8 erp_value = 0;
3327
	u32 ncrc;
3328
	u8 *bssid;
3329
	u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3330

3331
	sdata_assert_lock(sdata);
3332

3333 3334 3335
	/* Process beacon from the current BSS */
	baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
	if (baselen > len)
3336
		return;
3337

J
Johannes Berg 已提交
3338 3339 3340 3341
	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		rcu_read_unlock();
3342
		return;
J
Johannes Berg 已提交
3343 3344
	}

3345
	if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
J
Johannes Berg 已提交
3346
		rcu_read_unlock();
3347
		return;
J
Johannes Berg 已提交
3348
	}
3349
	chan = chanctx_conf->def.chan;
J
Johannes Berg 已提交
3350
	rcu_read_unlock();
3351

3352
	if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3353
	    ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
J
Johannes Berg 已提交
3354
		ieee802_11_parse_elems(mgmt->u.beacon.variable,
3355
				       len - baselen, false, &elems);
3356

3357
		ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3358 3359 3360 3361
		if (elems.tim && !elems.parse_error) {
			const struct ieee80211_tim_ie *tim_ie = elems.tim;
			ifmgd->dtim_period = tim_ie->dtim_period;
		}
3362
		ifmgd->have_beacon = true;
3363
		ifmgd->assoc_data->need_beacon = false;
3364
		if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3365 3366 3367 3368 3369 3370 3371 3372 3373 3374
			sdata->vif.bss_conf.sync_tsf =
				le64_to_cpu(mgmt->u.beacon.timestamp);
			sdata->vif.bss_conf.sync_device_ts =
				rx_status->device_timestamp;
			if (elems.tim)
				sdata->vif.bss_conf.sync_dtim_count =
					elems.tim->dtim_count;
			else
				sdata->vif.bss_conf.sync_dtim_count = 0;
		}
J
Johannes Berg 已提交
3375 3376
		/* continue assoc process */
		ifmgd->assoc_data->timeout = jiffies;
3377
		ifmgd->assoc_data->timeout_started = true;
3378 3379
		run_again(sdata, ifmgd->assoc_data->timeout);
		return;
J
Johannes Berg 已提交
3380
	}
3381

J
Johannes Berg 已提交
3382
	if (!ifmgd->associated ||
3383
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3384
		return;
J
Johannes Berg 已提交
3385
	bssid = ifmgd->associated->bssid;
3386

3387 3388 3389
	/* Track average RSSI from the Beacon frames of the current AP */
	if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
		ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3390
		ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3391
		ifmgd->last_cqm_event_signal = 0;
3392
		ifmgd->count_beacon_signal = 1;
3393
		ifmgd->last_ave_beacon_signal = 0;
3394
	} else {
3395
		ifmgd->count_beacon_signal++;
3396
	}
3397

3398 3399
	ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);

3400 3401
	if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3402
		int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3403
		int last_sig = ifmgd->last_ave_beacon_signal;
3404 3405 3406
		struct ieee80211_event event = {
			.type = RSSI_EVENT,
		};
3407 3408 3409 3410 3411 3412 3413 3414

		/*
		 * 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;
3415 3416
			event.u.rssi.data = RSSI_EVENT_HIGH;
			drv_event_callback(local, sdata, &event);
3417 3418 3419 3420
		} else if (sig < ifmgd->rssi_min_thold &&
			   (last_sig >= ifmgd->rssi_max_thold ||
			   last_sig == 0)) {
			ifmgd->last_ave_beacon_signal = sig;
3421 3422
			event.u.rssi.data = RSSI_EVENT_LOW;
			drv_event_callback(local, sdata, &event);
3423 3424 3425
		}
	}

3426
	if (bss_conf->cqm_rssi_thold &&
3427
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3428
	    !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3429
		int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3430 3431 3432
		int last_event = ifmgd->last_cqm_event_signal;
		int thold = bss_conf->cqm_rssi_thold;
		int hyst = bss_conf->cqm_rssi_hyst;
3433

3434 3435 3436 3437 3438 3439
		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,
3440
				sig, GFP_KERNEL);
3441 3442 3443 3444 3445 3446
		} 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,
3447
				sig, GFP_KERNEL);
3448 3449 3450
		}
	}

3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474
	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);
		}
	}

3475
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
J
Johannes Berg 已提交
3476
		mlme_dbg_ratelimited(sdata,
3477
				     "cancelling AP probe due to a received beacon\n");
3478
		ieee80211_reset_ap_probe(sdata);
3479 3480
	}

J
Johannes Berg 已提交
3481 3482 3483 3484
	/*
	 * Push the beacon loss detection into the future since
	 * we are processing a beacon from the AP just now.
	 */
3485
	ieee80211_sta_reset_beacon_monitor(sdata);
J
Johannes Berg 已提交
3486

3487 3488
	ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
	ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3489
					  len - baselen, false, &elems,
3490 3491
					  care_about_ies, ncrc);

3492 3493 3494 3495 3496 3497 3498
	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);
3499
			}
3500
			ieee80211_send_nullfunc(local, sdata, false);
3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512
		} 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);
3513 3514
		}
	}
J
Johannes Berg 已提交
3515

3516 3517
	if (sdata->vif.p2p ||
	    sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
J
Janusz Dziedzic 已提交
3518
		struct ieee80211_p2p_noa_attr noa = {};
3519 3520 3521 3522 3523
		int ret;

		ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
					    len - baselen,
					    IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3524
					    (u8 *) &noa, sizeof(noa));
J
Janusz Dziedzic 已提交
3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540
		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));
3541 3542 3543 3544 3545
			changed |= BSS_CHANGED_P2P_PS;
			ifmgd->beacon_crc_valid = false;
		}
	}

3546 3547 3548
	if (ifmgd->csa_waiting_bcn)
		ieee80211_chswitch_post_beacon(sdata);

3549 3550 3551 3552 3553 3554 3555 3556
	/*
	 * 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.
	 */
3557
	if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568
		sdata->vif.bss_conf.sync_tsf =
			le64_to_cpu(mgmt->u.beacon.timestamp);
		sdata->vif.bss_conf.sync_device_ts =
			rx_status->device_timestamp;
		if (elems.tim)
			sdata->vif.bss_conf.sync_dtim_count =
				elems.tim->dtim_count;
		else
			sdata->vif.bss_conf.sync_dtim_count = 0;
	}

3569
	if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3570
		return;
3571
	ifmgd->beacon_crc = ncrc;
3572
	ifmgd->beacon_crc_valid = true;
3573

3574
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3575

3576
	ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3577
					 rx_status->device_timestamp,
3578 3579
					 &elems, true);

3580 3581
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
	    ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3582 3583 3584
				     elems.wmm_param_len))
		changed |= BSS_CHANGED_QOS;

3585 3586
	/*
	 * If we haven't had a beacon before, tell the driver about the
3587
	 * DTIM period (and beacon timing if desired) now.
3588
	 */
3589
	if (!ifmgd->have_beacon) {
3590 3591 3592 3593 3594
		/* a few bogus AP send dtim_period = 0 or no TIM IE */
		if (elems.tim)
			bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
		else
			bss_conf->dtim_period = 1;
3595

3596 3597
		changed |= BSS_CHANGED_BEACON_INFO;
		ifmgd->have_beacon = true;
3598 3599

		mutex_lock(&local->iflist_mtx);
J
Johannes Berg 已提交
3600
		ieee80211_recalc_ps(local);
3601 3602
		mutex_unlock(&local->iflist_mtx);

3603
		ieee80211_recalc_ps_vif(sdata);
3604 3605
	}

3606
	if (elems.erp_info) {
J
Johannes Berg 已提交
3607 3608 3609 3610
		erp_valid = true;
		erp_value = elems.erp_info[0];
	} else {
		erp_valid = false;
3611
	}
J
Johannes Berg 已提交
3612 3613 3614
	changed |= ieee80211_handle_bss_capability(sdata,
			le16_to_cpu(mgmt->u.beacon.capab_info),
			erp_valid, erp_value);
3615

3616
	mutex_lock(&local->sta_mtx);
3617 3618
	sta = sta_info_get(sdata, bssid);

3619 3620
	if (ieee80211_config_bw(sdata, sta,
				elems.ht_cap_elem, elems.ht_operation,
3621 3622
				elems.vht_operation, bssid, &changed)) {
		mutex_unlock(&local->sta_mtx);
3623 3624 3625
		sdata_info(sdata,
			   "failed to follow AP %pM bandwidth change, disconnect\n",
			   bssid);
3626 3627 3628
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_DEAUTH_LEAVING,
				       true, deauth_buf);
3629 3630 3631
		ieee80211_report_disconnect(sdata, deauth_buf,
					    sizeof(deauth_buf), true,
					    WLAN_REASON_DEAUTH_LEAVING);
3632
		return;
3633
	}
3634 3635 3636

	if (sta && elems.opmode_notif)
		ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3637
					    rx_status->band);
3638
	mutex_unlock(&local->sta_mtx);
3639

3640 3641 3642
	changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
					       elems.country_elem,
					       elems.country_elem_len,
3643 3644
					       elems.pwr_constr_elem,
					       elems.cisco_dtpc_elem);
3645

3646
	ieee80211_bss_info_change_notify(sdata, changed);
3647 3648
}

3649 3650
void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
				  struct sk_buff *skb)
3651 3652 3653 3654
{
	struct ieee80211_rx_status *rx_status;
	struct ieee80211_mgmt *mgmt;
	u16 fc;
3655 3656
	struct ieee802_11_elems elems;
	int ies_len;
3657 3658 3659 3660 3661

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

3662
	sdata_lock(sdata);
3663

J
Johannes Berg 已提交
3664 3665
	switch (fc & IEEE80211_FCTL_STYPE) {
	case IEEE80211_STYPE_BEACON:
3666
		ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
J
Johannes Berg 已提交
3667 3668 3669 3670 3671
		break;
	case IEEE80211_STYPE_PROBE_RESP:
		ieee80211_rx_mgmt_probe_resp(sdata, skb);
		break;
	case IEEE80211_STYPE_AUTH:
3672
		ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3673 3674
		break;
	case IEEE80211_STYPE_DEAUTH:
3675
		ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3676 3677
		break;
	case IEEE80211_STYPE_DISASSOC:
3678
		ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3679 3680 3681
		break;
	case IEEE80211_STYPE_ASSOC_RESP:
	case IEEE80211_STYPE_REASSOC_RESP:
3682
		ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3683 3684
		break;
	case IEEE80211_STYPE_ACTION:
3685
		if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3686 3687 3688
			ies_len = skb->len -
				  offsetof(struct ieee80211_mgmt,
					   u.action.u.chan_switch.variable);
3689 3690 3691 3692 3693 3694

			if (ies_len < 0)
				break;

			ieee802_11_parse_elems(
				mgmt->u.action.u.chan_switch.variable,
3695
				ies_len, true, &elems);
3696 3697 3698 3699

			if (elems.parse_error)
				break;

3700
			ieee80211_sta_process_chanswitch(sdata,
3701 3702 3703
						 rx_status->mactime,
						 rx_status->device_timestamp,
						 &elems, false);
3704 3705 3706 3707 3708 3709 3710 3711 3712 3713
		} else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
			ies_len = skb->len -
				  offsetof(struct ieee80211_mgmt,
					   u.action.u.ext_chan_switch.variable);

			if (ies_len < 0)
				break;

			ieee802_11_parse_elems(
				mgmt->u.action.u.ext_chan_switch.variable,
3714
				ies_len, true, &elems);
3715 3716 3717 3718 3719 3720 3721 3722

			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
3723
			ieee80211_sta_process_chanswitch(sdata,
3724 3725 3726
						 rx_status->mactime,
						 rx_status->device_timestamp,
						 &elems, false);
3727
		}
3728
		break;
3729
	}
3730
	sdata_unlock(sdata);
3731 3732
}

J
Johannes Berg 已提交
3733
static void ieee80211_sta_timer(unsigned long data)
3734
{
J
Johannes Berg 已提交
3735 3736
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
3737

3738
	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3739 3740
}

3741
static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3742
					  u8 *bssid, u8 reason, bool tx)
3743
{
3744
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3745

3746
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3747
			       tx, frame_buf);
3748

3749 3750
	ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
				    reason);
3751 3752
}

3753
static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
3754 3755 3756 3757
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3758
	u32 tx_flags = 0;
3759 3760
	u16 trans = 1;
	u16 status = 0;
J
Johannes Berg 已提交
3761

3762
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3763 3764 3765 3766 3767 3768 3769

	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
3770 3771
		sdata_info(sdata, "authentication with %pM timed out\n",
			   auth_data->bss->bssid);
J
Johannes Berg 已提交
3772 3773 3774 3775 3776 3777 3778 3779 3780 3781

		/*
		 * Most likely AP is not in the range so remove the
		 * bss struct for that AP.
		 */
		cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);

		return -ETIMEDOUT;
	}

J
Johannes Berg 已提交
3782 3783
	drv_mgd_prepare_tx(local, sdata);

3784 3785 3786
	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
3787

3788
	auth_data->expected_transaction = 2;
3789

3790 3791 3792 3793 3794
	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
3795

3796 3797 3798
	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
3799

3800 3801 3802 3803 3804
	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
3805

3806
	if (tx_flags == 0) {
3807
		auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3808
		auth_data->timeout_started = true;
3809
		run_again(sdata, auth_data->timeout);
3810
	} else {
3811 3812 3813 3814
		auth_data->timeout =
			round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
		auth_data->timeout_started = true;
		run_again(sdata, auth_data->timeout);
3815
	}
J
Johannes Berg 已提交
3816 3817 3818 3819 3820 3821 3822 3823 3824

	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;

3825
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3826 3827 3828

	assoc_data->tries++;
	if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
J
Johannes Berg 已提交
3829 3830
		sdata_info(sdata, "association with %pM timed out\n",
			   assoc_data->bss->bssid);
J
Johannes Berg 已提交
3831 3832 3833 3834 3835 3836 3837 3838 3839 3840

		/*
		 * 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
3841 3842 3843
	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
3844 3845
	ieee80211_send_assoc(sdata);

3846
	if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3847
		assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3848
		assoc_data->timeout_started = true;
3849
		run_again(sdata, assoc_data->timeout);
3850
	} else {
3851 3852 3853 3854 3855
		assoc_data->timeout =
			round_jiffies_up(jiffies +
					 IEEE80211_ASSOC_TIMEOUT_LONG);
		assoc_data->timeout_started = true;
		run_again(sdata, assoc_data->timeout);
3856
	}
J
Johannes Berg 已提交
3857 3858 3859 3860

	return 0;
}

3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872
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);
}

3873
void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
3874 3875
{
	struct ieee80211_local *local = sdata->local;
3876
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3877

3878
	sdata_lock(sdata);
3879

3880 3881 3882 3883 3884
	if (ifmgd->status_received) {
		__le16 fc = ifmgd->status_fc;
		bool status_acked = ifmgd->status_acked;

		ifmgd->status_received = false;
3885
		if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3886 3887 3888
			if (status_acked) {
				ifmgd->auth_data->timeout =
					jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3889
				run_again(sdata, ifmgd->auth_data->timeout);
3890 3891 3892
			} else {
				ifmgd->auth_data->timeout = jiffies - 1;
			}
3893
			ifmgd->auth_data->timeout_started = true;
3894 3895 3896 3897 3898 3899
		} 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;
3900
				run_again(sdata, ifmgd->assoc_data->timeout);
3901 3902 3903
			} else {
				ifmgd->assoc_data->timeout = jiffies - 1;
			}
3904
			ifmgd->assoc_data->timeout_started = true;
3905 3906 3907
		}
	}

3908
	if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
J
Johannes Berg 已提交
3909 3910 3911 3912 3913 3914 3915
	    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);
3916
		} else if (ieee80211_auth(sdata)) {
J
Johannes Berg 已提交
3917
			u8 bssid[ETH_ALEN];
3918 3919 3920 3921 3922
			struct ieee80211_event event = {
				.type = MLME_EVENT,
				.u.mlme.data = AUTH_EVENT,
				.u.mlme.status = MLME_TIMEOUT,
			};
J
Johannes Berg 已提交
3923 3924 3925 3926 3927

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

			ieee80211_destroy_auth_data(sdata, false);

3928
			cfg80211_auth_timeout(sdata->dev, bssid);
3929
			drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
3930
		}
3931
	} else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3932
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
3933

3934
	if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
J
Johannes Berg 已提交
3935
	    time_after(jiffies, ifmgd->assoc_data->timeout)) {
3936
		if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
J
Johannes Berg 已提交
3937
		    ieee80211_do_assoc(sdata)) {
3938
			struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3939 3940 3941 3942 3943
			struct ieee80211_event event = {
				.type = MLME_EVENT,
				.u.mlme.data = ASSOC_EVENT,
				.u.mlme.status = MLME_TIMEOUT,
			};
J
Johannes Berg 已提交
3944

3945
			ieee80211_destroy_assoc_data(sdata, false, false);
3946
			cfg80211_assoc_timeout(sdata->dev, bss);
3947
			drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
3948
		}
3949
	} else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3950
		run_again(sdata, ifmgd->assoc_data->timeout);
J
Johannes Berg 已提交
3951

3952
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
J
Johannes Berg 已提交
3953
	    ifmgd->associated) {
3954
		u8 bssid[ETH_ALEN];
3955
		int max_tries;
3956

3957
		memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3958

3959
		if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3960
			max_tries = max_nullfunc_tries;
3961
		else
3962
			max_tries = max_probe_tries;
3963

3964 3965 3966
		/* ACK received for nullfunc probing frame */
		if (!ifmgd->probe_send_count)
			ieee80211_reset_ap_probe(sdata);
3967 3968
		else if (ifmgd->nullfunc_failed) {
			if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3969 3970 3971 3972
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
					 bssid, ifmgd->probe_send_count,
					 max_tries);
3973 3974
				ieee80211_mgd_probe_ap_send(sdata);
			} else {
J
Johannes Berg 已提交
3975 3976 3977
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
					 bssid);
3978
				ieee80211_sta_connection_lost(sdata, bssid,
3979 3980
					WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
					false);
3981 3982
			}
		} else if (time_is_after_jiffies(ifmgd->probe_timeout))
3983
			run_again(sdata, ifmgd->probe_timeout);
3984
		else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
J
Johannes Berg 已提交
3985 3986 3987
			mlme_dbg(sdata,
				 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
				 bssid, probe_wait_ms);
3988
			ieee80211_sta_connection_lost(sdata, bssid,
3989
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3990
		} else if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3991 3992 3993 3994
			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);
3995 3996
			ieee80211_mgd_probe_ap_send(sdata);
		} else {
J
Johannes Berg 已提交
3997 3998 3999 4000
			/*
			 * We actually lost the connection ... or did we?
			 * Let's make sure!
			 */
4001 4002 4003
			mlme_dbg(sdata,
				 "No probe response from AP %pM after %dms, disconnecting.\n",
				 bssid, probe_wait_ms);
4004

4005
			ieee80211_sta_connection_lost(sdata, bssid,
4006
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
J
Johannes Berg 已提交
4007 4008 4009
		}
	}

4010
	sdata_unlock(sdata);
4011 4012
}

J
Johannes Berg 已提交
4013 4014 4015 4016
static void ieee80211_sta_bcn_mon_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
4017
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
4018

4019
	if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
M
Michal Kazior 已提交
4020 4021
		return;

4022
	sdata->u.mgd.connection_loss = false;
4023 4024
	ieee80211_queue_work(&sdata->local->hw,
			     &sdata->u.mgd.beacon_connection_loss_work);
J
Johannes Berg 已提交
4025 4026 4027 4028 4029 4030 4031 4032 4033
}

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

4034
	if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
M
Michal Kazior 已提交
4035 4036
		return;

4037
	ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
J
Johannes Berg 已提交
4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048
}

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
4049 4050
static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
4051
	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4052
		__ieee80211_stop_poll(sdata);
4053

J
Johannes Berg 已提交
4054
		/* let's probe the connection once */
4055
		if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4056 4057
			ieee80211_queue_work(&sdata->local->hw,
					     &sdata->u.mgd.monitor_work);
4058
	}
J
Johannes Berg 已提交
4059
}
4060

4061
#ifdef CONFIG_PM
4062 4063 4064 4065 4066 4067 4068
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);

4069 4070 4071 4072 4073
	if (ifmgd->auth_data || ifmgd->assoc_data) {
		const u8 *bssid = ifmgd->auth_data ?
				ifmgd->auth_data->bss->bssid :
				ifmgd->assoc_data->bss->bssid;

4074
		/*
4075 4076 4077
		 * 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.
4078
		 */
4079
		ieee80211_send_deauth_disassoc(sdata, bssid,
4080 4081 4082
					       IEEE80211_STYPE_DEAUTH,
					       WLAN_REASON_DEAUTH_LEAVING,
					       false, frame_buf);
4083
		if (ifmgd->assoc_data)
4084
			ieee80211_destroy_assoc_data(sdata, false, true);
4085 4086
		if (ifmgd->auth_data)
			ieee80211_destroy_auth_data(sdata, false);
4087 4088 4089 4090
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
	}

4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118
	/* 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);
	}

4119 4120 4121
	sdata_unlock(sdata);
}

4122 4123 4124 4125
void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

4126
	sdata_lock(sdata);
4127
	if (!ifmgd->associated) {
4128
		sdata_unlock(sdata);
4129 4130 4131 4132 4133 4134 4135 4136 4137 4138
		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);
4139
		sdata_unlock(sdata);
4140 4141
		return;
	}
4142
	sdata_unlock(sdata);
4143 4144 4145
}
#endif

J
Johannes Berg 已提交
4146 4147
/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4148
{
4149
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
4150

4151
	ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
4152
	INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4153
	INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4154 4155
	INIT_WORK(&ifmgd->beacon_connection_loss_work,
		  ieee80211_beacon_connection_loss_work);
4156 4157
	INIT_WORK(&ifmgd->csa_connection_drop_work,
		  ieee80211_csa_connection_drop_work);
4158
	INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4159 4160
	INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
			  ieee80211_tdls_peer_del_work);
4161
	setup_timer(&ifmgd->timer, ieee80211_sta_timer,
S
Sujith 已提交
4162
		    (unsigned long) sdata);
J
Johannes Berg 已提交
4163 4164 4165 4166
	setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
		    (unsigned long) sdata);
	setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
		    (unsigned long) sdata);
4167
	setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
J
Johannes Berg 已提交
4168
		    (unsigned long) sdata);
4169 4170
	INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
			  ieee80211_sta_handle_tspec_ac_params_wk);
J
Johannes Berg 已提交
4171

4172
	ifmgd->flags = 0;
4173
	ifmgd->powersave = sdata->wdev.ps;
4174 4175
	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
4176
	ifmgd->p2p_noa_index = -1;
J
Johannes Berg 已提交
4177

4178
	if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4179 4180 4181
		ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
	else
		ifmgd->req_smps = IEEE80211_SMPS_OFF;
4182 4183 4184 4185 4186

	/* Setup TDLS data */
	spin_lock_init(&ifmgd->teardown_lock);
	ifmgd->teardown_skb = NULL;
	ifmgd->orig_teardown_skb = NULL;
4187 4188
}

4189 4190
/* scan finished notification */
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
J
Johannes Berg 已提交
4191
{
4192
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
4193

4194 4195
	/* Restart STA timers */
	rcu_read_lock();
4196 4197 4198 4199
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (ieee80211_sdata_running(sdata))
			ieee80211_restart_sta_timer(sdata);
	}
4200 4201
	rcu_read_unlock();
}
J
Johannes Berg 已提交
4202

J
Johannes Berg 已提交
4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214
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;

4215
	ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
J
Johannes Berg 已提交
4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227
	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;

4228
	vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
J
Johannes Berg 已提交
4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246
	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;
}

4247 4248
static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
				  struct cfg80211_bss *cbss)
4249 4250 4251
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4252
	const struct ieee80211_ht_cap *ht_cap = NULL;
4253
	const struct ieee80211_ht_operation *ht_oper = NULL;
J
Johannes Berg 已提交
4254
	const struct ieee80211_vht_operation *vht_oper = NULL;
4255
	struct ieee80211_supported_band *sband;
4256
	struct cfg80211_chan_def chandef;
J
Johannes Berg 已提交
4257
	int ret;
4258 4259
	u32 i;
	bool have_80mhz;
4260

4261 4262
	sband = local->hw.wiphy->bands[cbss->channel->band];

J
Johannes Berg 已提交
4263 4264 4265 4266
	ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
			  IEEE80211_STA_DISABLE_80P80MHZ |
			  IEEE80211_STA_DISABLE_160MHZ);

4267 4268
	rcu_read_lock();

J
Johannes Berg 已提交
4269 4270
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	    sband->ht_cap.ht_supported) {
4271
		const u8 *ht_oper_ie, *ht_cap_ie;
4272

4273
		ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4274 4275
		if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
			ht_oper = (void *)(ht_oper_ie + 2);
4276

4277 4278 4279 4280 4281
		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) {
4282 4283 4284
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ht_oper = NULL;
		}
4285 4286
	}

J
Johannes Berg 已提交
4287 4288
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    sband->vht_cap.vht_supported) {
4289
		const u8 *vht_oper_ie, *vht_cap;
J
Johannes Berg 已提交
4290

4291 4292
		vht_oper_ie = ieee80211_bss_get_ie(cbss,
						   WLAN_EID_VHT_OPERATION);
J
Johannes Berg 已提交
4293 4294 4295 4296
		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
4297
			sdata_info(sdata,
J
Johannes Berg 已提交
4298
				   "AP advertised VHT without HT, disabling both\n");
4299 4300
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4301
		}
4302 4303 4304 4305 4306 4307

		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;
		}
4308 4309
	}

4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323
	/* 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
4324 4325
	ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
						     cbss->channel,
4326
						     ht_cap, ht_oper, vht_oper,
4327
						     &chandef, false);
4328

J
Johannes Berg 已提交
4329 4330
	sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
				      local->rx_chains);
4331

4332 4333
	rcu_read_unlock();

4334 4335 4336
	/* will change later if needed */
	sdata->smps_mode = IEEE80211_SMPS_OFF;

4337
	mutex_lock(&local->mtx);
J
Johannes Berg 已提交
4338 4339 4340 4341 4342 4343 4344
	/*
	 * 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);
4345 4346 4347 4348

	/* don't downgrade for 5 and 10 MHz channels, though. */
	if (chandef.width == NL80211_CHAN_WIDTH_5 ||
	    chandef.width == NL80211_CHAN_WIDTH_10)
4349
		goto out;
4350

4351
	while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4352
		ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4353 4354 4355
		ret = ieee80211_vif_use_channel(sdata, &chandef,
						IEEE80211_CHANCTX_SHARED);
	}
4356 4357
 out:
	mutex_unlock(&local->mtx);
J
Johannes Berg 已提交
4358
	return ret;
4359 4360 4361
}

static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4362 4363
				     struct cfg80211_bss *cbss, bool assoc,
				     bool override)
4364 4365 4366 4367 4368
{
	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;
4369
	struct ieee80211_supported_band *sband;
4370
	bool have_sta = false;
4371 4372
	int err;

4373 4374
	sband = local->hw.wiphy->bands[cbss->channel->band];

4375 4376 4377
	if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
		return -EINVAL;

4378 4379 4380 4381
	/* If a reconfig is happening, bail out */
	if (local->in_reconfig)
		return -EBUSY;

4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392
	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;
	}
4393

4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406
	/*
	 * 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
4407
	if (new_sta) {
4408 4409 4410
		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
4411
		const struct cfg80211_bss_ies *ies;
4412
		int shift = ieee80211_vif_get_shift(&sdata->vif);
4413 4414 4415 4416 4417

		ieee80211_get_rates(sband, bss->supp_rates,
				    bss->supp_rates_len,
				    &rates, &basic_rates,
				    &have_higher_than_11mbit,
4418
				    &min_rate, &min_rate_index,
4419
				    shift);
4420 4421 4422 4423 4424 4425 4426 4427 4428 4429

		/*
		 * 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
4430 4431
			sdata_info(sdata,
				   "No basic rates, using min rate instead\n");
4432 4433 4434
			basic_rates = BIT(min_rate_index);
		}

J
Johannes Berg 已提交
4435
		new_sta->sta.supp_rates[cbss->channel->band] = rates;
4436 4437 4438
		sdata->vif.bss_conf.basic_rates = basic_rates;

		/* cf. IEEE 802.11 9.2.12 */
4439
		if (cbss->channel->band == NL80211_BAND_2GHZ &&
4440 4441 4442 4443 4444 4445 4446
		    have_higher_than_11mbit)
			sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
		else
			sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

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

4447 4448
		/* set timing information */
		sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
J
Johannes Berg 已提交
4449
		rcu_read_lock();
4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462
		ies = rcu_dereference(cbss->beacon_ies);
		if (ies) {
			const u8 *tim_ie;

			sdata->vif.bss_conf.sync_tsf = ies->tsf;
			sdata->vif.bss_conf.sync_device_ts =
				bss->device_ts_beacon;
			tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
						  ies->data, ies->len);
			if (tim_ie && tim_ie[1] >= 2)
				sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
			else
				sdata->vif.bss_conf.sync_dtim_count = 0;
4463 4464
		} else if (!ieee80211_hw_check(&sdata->local->hw,
					       TIMING_BEACON_ONLY)) {
4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475
			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
4476
		rcu_read_unlock();
4477
	}
4478

4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492
	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
		 */
4493
		ieee80211_bss_info_change_notify(sdata,
4494 4495
			BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
			BSS_CHANGED_BEACON_INT);
4496 4497

		if (assoc)
J
Johannes Berg 已提交
4498
			sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4499

J
Johannes Berg 已提交
4500 4501
		err = sta_info_insert(new_sta);
		new_sta = NULL;
4502
		if (err) {
J
Johannes Berg 已提交
4503 4504 4505
			sdata_info(sdata,
				   "failed to insert STA entry for the AP (error %d)\n",
				   err);
4506 4507 4508
			return err;
		}
	} else
4509
		WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4510

4511 4512 4513 4514
	/* Cancel scan to ensure that nothing interferes with connection */
	if (local->scanning)
		ieee80211_scan_cancel(local);

4515 4516 4517
	return 0;
}

4518 4519 4520
/* config hooks */
int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
		       struct cfg80211_auth_request *req)
J
Johannes Berg 已提交
4521
{
J
Johannes Berg 已提交
4522 4523 4524
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data;
4525
	u16 auth_alg;
J
Johannes Berg 已提交
4526 4527 4528
	int err;

	/* prepare auth data structure */
J
Johannes Berg 已提交
4529

4530 4531 4532 4533 4534
	switch (req->auth_type) {
	case NL80211_AUTHTYPE_OPEN_SYSTEM:
		auth_alg = WLAN_AUTH_OPEN;
		break;
	case NL80211_AUTHTYPE_SHARED_KEY:
J
Johannes Berg 已提交
4535
		if (IS_ERR(local->wep_tx_tfm))
4536
			return -EOPNOTSUPP;
4537 4538 4539 4540 4541 4542 4543 4544
		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;
4545 4546 4547
	case NL80211_AUTHTYPE_SAE:
		auth_alg = WLAN_AUTH_SAE;
		break;
4548 4549 4550 4551 4552 4553 4554 4555 4556
	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;
4557 4558
	default:
		return -EOPNOTSUPP;
J
Johannes Berg 已提交
4559
	}
4560

4561
	auth_data = kzalloc(sizeof(*auth_data) + req->auth_data_len +
4562
			    req->ie_len, GFP_KERNEL);
J
Johannes Berg 已提交
4563
	if (!auth_data)
J
Johannes Berg 已提交
4564
		return -ENOMEM;
4565

J
Johannes Berg 已提交
4566
	auth_data->bss = req->bss;
4567

4568
	if (req->auth_data_len >= 4) {
4569 4570 4571 4572 4573 4574
		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]);
		}
4575 4576 4577
		memcpy(auth_data->data, req->auth_data + 4,
		       req->auth_data_len - 4);
		auth_data->data_len += req->auth_data_len - 4;
4578 4579
	}

4580
	if (req->ie && req->ie_len) {
4581 4582 4583
		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
4584
	}
4585

J
Johannes Berg 已提交
4586
	if (req->key && req->key_len) {
J
Johannes Berg 已提交
4587 4588 4589
		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
4590 4591
	}

J
Johannes Berg 已提交
4592
	auth_data->algorithm = auth_alg;
J
Johannes Berg 已提交
4593

J
Johannes Berg 已提交
4594
	/* try to authenticate/probe */
4595

J
Johannes Berg 已提交
4596 4597 4598 4599
	if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
	    ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
4600 4601
	}

J
Johannes Berg 已提交
4602 4603
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
4604

J
Johannes Berg 已提交
4605 4606
	/* prep auth_data so we don't go into idle on disassoc */
	ifmgd->auth_data = auth_data;
J
Johannes Berg 已提交
4607

4608 4609 4610
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

4611 4612 4613
		sdata_info(sdata,
			   "disconnect from AP %pM for new auth to %pM\n",
			   ifmgd->associated->bssid, req->bss->bssid);
4614 4615 4616 4617
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_UNSPECIFIED,
				       false, frame_buf);

4618 4619 4620
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    WLAN_REASON_UNSPECIFIED);
4621
	}
J
Johannes Berg 已提交
4622

J
Johannes Berg 已提交
4623
	sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4624

4625
	err = ieee80211_prep_connection(sdata, req->bss, false, false);
4626
	if (err)
J
Johannes Berg 已提交
4627
		goto err_clear;
J
Johannes Berg 已提交
4628

4629
	err = ieee80211_auth(sdata);
J
Johannes Berg 已提交
4630 4631 4632 4633 4634 4635
	if (err) {
		sta_info_destroy_addr(sdata, req->bss->bssid);
		goto err_clear;
	}

	/* hold our own reference */
4636
	cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4637
	return 0;
J
Johannes Berg 已提交
4638 4639

 err_clear:
4640
	eth_zero_addr(ifmgd->bssid);
4641
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4642
	ifmgd->auth_data = NULL;
4643 4644 4645
	mutex_lock(&sdata->local->mtx);
	ieee80211_vif_release_channel(sdata);
	mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
4646 4647 4648
 err_free:
	kfree(auth_data);
	return err;
J
Johannes Berg 已提交
4649 4650
}

4651 4652
int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
			struct cfg80211_assoc_request *req)
4653
{
J
Johannes Berg 已提交
4654
	struct ieee80211_local *local = sdata->local;
4655
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4656
	struct ieee80211_bss *bss = (void *)req->bss->priv;
J
Johannes Berg 已提交
4657
	struct ieee80211_mgd_assoc_data *assoc_data;
4658
	const struct cfg80211_bss_ies *beacon_ies;
J
Johannes Berg 已提交
4659
	struct ieee80211_supported_band *sband;
4660
	const u8 *ssidie, *ht_ie, *vht_ie;
4661
	int i, err;
4662
	bool override = false;
4663

J
Johannes Berg 已提交
4664 4665 4666 4667
	assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
	if (!assoc_data)
		return -ENOMEM;

4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678
	rcu_read_lock();
	ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
	if (!ssidie) {
		rcu_read_unlock();
		kfree(assoc_data);
		return -EINVAL;
	}
	memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
	assoc_data->ssid_len = ssidie[1];
	rcu_read_unlock();

4679 4680 4681
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

4682 4683 4684
		sdata_info(sdata,
			   "disconnect from AP %pM for new assoc to %pM\n",
			   ifmgd->associated->bssid, req->bss->bssid);
4685 4686 4687 4688
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_UNSPECIFIED,
				       false, frame_buf);

4689 4690 4691
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    WLAN_REASON_UNSPECIFIED);
4692
	}
J
Johannes Berg 已提交
4693 4694 4695 4696

	if (ifmgd->auth_data && !ifmgd->auth_data->done) {
		err = -EBUSY;
		goto err_free;
J
Johannes Berg 已提交
4697
	}
4698

J
Johannes Berg 已提交
4699 4700 4701 4702
	if (ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
	}
4703

J
Johannes Berg 已提交
4704 4705 4706 4707
	if (ifmgd->auth_data) {
		bool match;

		/* keep sta info, bssid if matching */
4708
		match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
J
Johannes Berg 已提交
4709
		ieee80211_destroy_auth_data(sdata, match);
4710 4711
	}

J
Johannes Berg 已提交
4712
	/* prepare assoc data */
4713

4714 4715
	ifmgd->beacon_crc_valid = false;

4716 4717 4718
	assoc_data->wmm = bss->wmm_used &&
			  (local->hw.queues >= IEEE80211_NUM_ACS);

J
Johannes Berg 已提交
4719 4720 4721 4722 4723 4724 4725
	/*
	 * 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.
	 */
4726
	for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4727 4728
		if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4729
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4730
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4731
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4732
			netdev_info(sdata->dev,
4733
				    "disabling HT/VHT due to WEP/TKIP use\n");
4734 4735
		}
	}
4736

J
Johannes Berg 已提交
4737 4738 4739
	/* Also disable HT if we don't support it or the AP doesn't use WMM */
	sband = local->hw.wiphy->bands[req->bss->channel->band];
	if (!sband->ht_cap.ht_supported ||
4740 4741
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4742
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4743 4744
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4745 4746
			netdev_info(sdata->dev,
				    "disabling HT as WMM/QoS is not supported by the AP\n");
4747
	}
J
Johannes Berg 已提交
4748

4749 4750
	/* disable VHT if we don't support it or the AP doesn't use WMM */
	if (!sband->vht_cap.vht_supported ||
4751 4752
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4753
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4754 4755
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4756 4757
			netdev_info(sdata->dev,
				    "disabling VHT as WMM/QoS is not supported by the AP\n");
4758 4759
	}

B
Ben Greear 已提交
4760 4761 4762 4763
	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));

4764 4765 4766 4767
	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));

4768
	if (req->ie && req->ie_len) {
J
Johannes Berg 已提交
4769 4770 4771
		memcpy(assoc_data->ie, req->ie, req->ie_len);
		assoc_data->ie_len = req->ie_len;
	}
4772

4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787
	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
4788
	assoc_data->bss = req->bss;
4789

J
Johannes Berg 已提交
4790 4791
	if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
		if (ifmgd->powersave)
4792
			sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
J
Johannes Berg 已提交
4793
		else
4794
			sdata->smps_mode = IEEE80211_SMPS_OFF;
J
Johannes Berg 已提交
4795
	} else
4796
		sdata->smps_mode = ifmgd->req_smps;
J
Johannes Berg 已提交
4797

J
Johannes Berg 已提交
4798 4799 4800
	assoc_data->capability = req->bss->capability;
	assoc_data->supp_rates = bss->supp_rates;
	assoc_data->supp_rates_len = bss->supp_rates_len;
4801

4802
	rcu_read_lock();
4803 4804 4805 4806 4807
	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
4808
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4809 4810 4811 4812 4813 4814
	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;
4815
	rcu_read_unlock();
4816

4817
	if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4818
		 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4819 4820 4821
	     "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
		sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;

K
Kalle Valo 已提交
4822
	if (bss->wmm_used && bss->uapsd_supported &&
4823
	    (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4824
		assoc_data->uapsd = true;
K
Kalle Valo 已提交
4825 4826
		ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
	} else {
4827
		assoc_data->uapsd = false;
K
Kalle Valo 已提交
4828 4829 4830
		ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
	}

4831
	if (req->prev_bssid)
J
Johannes Berg 已提交
4832
		memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4833 4834 4835 4836 4837 4838 4839 4840 4841

	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;
	}

4842 4843 4844 4845 4846
	if (req->flags & ASSOC_REQ_USE_RRM)
		ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
	else
		ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;

4847 4848 4849 4850 4851
	if (req->crypto.control_port)
		ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
	else
		ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;

4852 4853
	sdata->control_port_protocol = req->crypto.control_port_ethertype;
	sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4854 4855
	sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
							sdata->vif.type);
4856

J
Johannes Berg 已提交
4857 4858 4859
	/* kick off associate process */

	ifmgd->assoc_data = assoc_data;
4860
	ifmgd->dtim_period = 0;
4861
	ifmgd->have_beacon = false;
J
Johannes Berg 已提交
4862

4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884 4885 4886 4887 4888 4889 4890 4891 4892
	/* override HT/VHT configuration only if the AP and we support it */
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
		struct ieee80211_sta_ht_cap sta_ht_cap;

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

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

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

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

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

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

	err = ieee80211_prep_connection(sdata, req->bss, true, override);
4893 4894
	if (err)
		goto err_clear;
J
Johannes Berg 已提交
4895

4896 4897
	rcu_read_lock();
	beacon_ies = rcu_dereference(req->bss->beacon_ies);
4898

4899
	if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4900 4901 4902 4903 4904 4905 4906 4907
	    !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);
4908
		assoc_data->timeout_started = true;
4909 4910 4911 4912 4913
		assoc_data->need_beacon = true;
	} else if (beacon_ies) {
		const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
						    beacon_ies->data,
						    beacon_ies->len);
4914 4915
		u8 dtim_count = 0;

4916 4917 4918 4919
		if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
			const struct ieee80211_tim_ie *tim;
			tim = (void *)(tim_ie + 2);
			ifmgd->dtim_period = tim->dtim_period;
4920
			dtim_count = tim->dtim_count;
4921
		}
4922
		ifmgd->have_beacon = true;
J
Johannes Berg 已提交
4923
		assoc_data->timeout = jiffies;
4924
		assoc_data->timeout_started = true;
4925

4926
		if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4927 4928 4929 4930 4931
			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;
		}
4932 4933
	} else {
		assoc_data->timeout = jiffies;
4934
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
4935
	}
4936 4937
	rcu_read_unlock();

4938
	run_again(sdata, assoc_data->timeout);
J
Johannes Berg 已提交
4939

P
Paul Stewart 已提交
4940 4941 4942 4943 4944 4945 4946 4947 4948 4949
	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
4950 4951
		sdata_info(sdata, "associating with AP with corrupt %s\n",
			   corrupt_type);
P
Paul Stewart 已提交
4952 4953
	}

4954
	return 0;
J
Johannes Berg 已提交
4955
 err_clear:
4956
	eth_zero_addr(ifmgd->bssid);
4957
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4958 4959 4960 4961
	ifmgd->assoc_data = NULL;
 err_free:
	kfree(assoc_data);
	return err;
4962 4963
}

4964
int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4965
			 struct cfg80211_deauth_request *req)
4966
{
4967
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4968
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4969
	bool tx = !req->local_state_change;
4970

4971 4972 4973 4974 4975 4976
	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));
4977

4978
		drv_mgd_prepare_tx(sdata->local, sdata);
4979 4980
		ieee80211_send_deauth_disassoc(sdata, req->bssid,
					       IEEE80211_STYPE_DEAUTH,
4981
					       req->reason_code, tx,
4982
					       frame_buf);
4983
		ieee80211_destroy_auth_data(sdata, false);
4984 4985 4986
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    req->reason_code);
4987

4988
		return 0;
4989 4990
	}

4991 4992 4993 4994 4995 4996 4997 4998 4999 5000 5001 5002
	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));

		drv_mgd_prepare_tx(sdata->local, sdata);
		ieee80211_send_deauth_disassoc(sdata, req->bssid,
					       IEEE80211_STYPE_DEAUTH,
					       req->reason_code, tx,
					       frame_buf);
5003
		ieee80211_destroy_assoc_data(sdata, false, true);
5004 5005 5006 5007 5008 5009
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    req->reason_code);
		return 0;
	}

5010 5011
	if (ifmgd->associated &&
	    ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
5012 5013 5014 5015 5016
		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));

5017 5018
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       req->reason_code, tx, frame_buf);
5019 5020 5021
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    req->reason_code);
5022 5023
		return 0;
	}
5024

5025
	return -ENOTCONN;
5026
}
5027

5028
int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
5029
			   struct cfg80211_disassoc_request *req)
J
Johannes Berg 已提交
5030
{
5031
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5032
	u8 bssid[ETH_ALEN];
5033
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
J
Johannes Berg 已提交
5034

J
Johannes Berg 已提交
5035 5036 5037 5038 5039 5040
	/*
	 * 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.
	 */
5041
	if (ifmgd->associated != req->bss)
5042 5043
		return -ENOLINK;

J
Johannes Berg 已提交
5044
	sdata_info(sdata,
5045 5046
		   "disassociating from %pM by local choice (Reason: %u=%s)\n",
		   req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
5047

5048
	memcpy(bssid, req->bss->bssid, ETH_ALEN);
5049 5050 5051
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
			       req->reason_code, !req->local_state_change,
			       frame_buf);
5052

5053 5054
	ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
				    req->reason_code);
5055

5056 5057
	return 0;
}
5058

5059
void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5060 5061 5062
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

5063 5064 5065 5066 5067 5068 5069 5070 5071 5072
	/*
	 * 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);
5073
	cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5074

5075
	sdata_lock(sdata);
5076 5077
	if (ifmgd->assoc_data) {
		struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5078
		ieee80211_destroy_assoc_data(sdata, false, false);
5079 5080
		cfg80211_assoc_timeout(sdata->dev, bss);
	}
5081 5082
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
5083 5084 5085 5086 5087 5088 5089
	spin_lock_bh(&ifmgd->teardown_lock);
	if (ifmgd->teardown_skb) {
		kfree_skb(ifmgd->teardown_skb);
		ifmgd->teardown_skb = NULL;
		ifmgd->orig_teardown_skb = NULL;
	}
	spin_unlock_bh(&ifmgd->teardown_lock);
5090
	del_timer_sync(&ifmgd->timer);
5091
	sdata_unlock(sdata);
5092 5093
}

5094 5095
void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
			       enum nl80211_cqm_rssi_threshold_event rssi_event,
5096
			       s32 rssi_level,
5097 5098 5099 5100
			       gfp_t gfp)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

5101
	trace_api_cqm_rssi_notify(sdata, rssi_event, rssi_level);
J
Johannes Berg 已提交
5102

5103
	cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, rssi_level, gfp);
5104 5105
}
EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5106 5107 5108 5109 5110 5111 5112 5113 5114 5115

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);