mlme.c 146.1 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 rate_flags, rates = 0;
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605

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;
615
	rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
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	rcu_read_unlock();
	sband = local->hw.wiphy->bands[chan->band];
618
	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)...
		 */
627 628 629 630
		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.
		 */
637 638 639 640 641 642 643 644
		rates_len = 0;
		for (i = 0; i < sband->n_bitrates; i++) {
			if ((rate_flags & sband->bitrates[i].flags)
			    != rate_flags)
				continue;
			rates |= BIT(i);
			rates_len++;
		}
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	}

	skb = alloc_skb(local->hw.extra_tx_headroom +
			sizeof(*mgmt) + /* bit too much but doesn't matter */
			2 + assoc_data->ssid_len + /* SSID */
			4 + rates_len + /* (extended) rates */
			4 + /* power capability */
			2 + 2 * sband->n_channels + /* supported channels */
			2 + sizeof(struct ieee80211_ht_cap) + /* HT */
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			2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
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			assoc_data->ie_len + /* extra IEs */
656
			(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;

666
	if (sband->band == NL80211_BAND_2GHZ) {
667 668
		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) &&
675
	    ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
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		capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;

678 679 680
	if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
		capab |= WLAN_CAPABILITY_RADIO_MEASURE;

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

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

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

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

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

	count = 0;
	for (i = 0; i < sband->n_bitrates; i++) {
		if (BIT(i) & rates) {
723 724 725
			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) {
738 739 740 741
				int rate;
				rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
						    5 * (1 << shift));
				*pos++ = (u8) rate;
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			}
		}
	}

746 747
	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 */
752 753
		 /* max tx power */
		*pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
754
	}
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756
	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 */
769
	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,
780 781
			WLAN_EID_FAST_BSS_TRANSITION,	/* reassoc only */
			WLAN_EID_RIC_DATA,		/* reassoc only */
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			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
		};
784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803
		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;

813
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
814
		ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
815
				    sband, chan, sdata->smps_mode);
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817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836
	/* 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,
		};
837 838

		/* RIC already taken above, so no need to handle here anymore */
839 840 841 842 843 844 845 846
		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;
	}

847
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
848 849
		ieee80211_add_vht_ie(sdata, skb, sband,
				     &assoc_data->ap_vht_cap);
850

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851
	/* if present, add any custom non-vendor IEs that go after HT */
852
	if (assoc_data->ie_len) {
J
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853 854 855 856 857 858 859 860
		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;
	}

861 862
	if (assoc_data->wmm) {
		if (assoc_data->uapsd) {
863 864
			qos_info = ifmgd->uapsd_queues;
			qos_info |= (ifmgd->uapsd_max_sp_len <<
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Johannes Berg 已提交
865 866 867 868 869
				     IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
		} else {
			qos_info = 0;
		}

870
		pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
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Johannes Berg 已提交
871 872 873
	}

	/* add any remaining custom (i.e. vendor specific here) IEs */
874
	if (assoc_data->ie_len) {
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875 876 877 878 879
		noffset = assoc_data->ie_len;
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
	}

880 881 882 883 884 885
	if (assoc_data->fils_kek_len &&
	    fils_encrypt_assoc_req(skb, assoc_data) < 0) {
		dev_kfree_skb(skb);
		return;
	}

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886 887
	drv_mgd_prepare_tx(local, sdata);

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888
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
889
	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
890 891
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
						IEEE80211_TX_INTFL_MLME_CONN_TX;
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892 893 894
	ieee80211_tx_skb(sdata, skb);
}

895 896 897 898 899 900
void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_pspoll *pspoll;
	struct sk_buff *skb;

901 902
	skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
	if (!skb)
903 904
		return;

905 906
	pspoll = (struct ieee80211_pspoll *) skb->data;
	pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
907

908 909
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
910 911
}

912 913
void ieee80211_send_nullfunc(struct ieee80211_local *local,
			     struct ieee80211_sub_if_data *sdata,
914
			     bool powersave)
915 916
{
	struct sk_buff *skb;
917
	struct ieee80211_hdr_3addr *nullfunc;
918
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
919

920 921
	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
	if (!skb)
922 923
		return;

924
	nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
925
	if (powersave)
926
		nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
927

928 929
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
					IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
930

931
	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
932 933
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;

934
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
935 936
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;

937
	ieee80211_tx_skb(sdata, skb);
938 939
}

940 941 942 943 944 945 946 947 948 949 950
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);
951
	if (!skb)
952
		return;
953

954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969
	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);
}

970 971 972 973 974
/* 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);
975
	struct ieee80211_local *local = sdata->local;
976
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
977
	int ret;
978

979
	if (!ieee80211_sdata_running(sdata))
980 981
		return;

982
	sdata_lock(sdata);
983 984 985
	mutex_lock(&local->mtx);
	mutex_lock(&local->chanctx_mtx);

986 987
	if (!ifmgd->associated)
		goto out;
988

989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022
	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)) {
1023
		sdata_info(sdata,
1024
			   "failed to finalize channel switch, disconnecting\n");
1025 1026 1027 1028
		ieee80211_queue_work(&sdata->local->hw,
				     &ifmgd->csa_connection_drop_work);
		goto out;
	}
1029

1030
	/* XXX: shouldn't really modify cfg80211-owned data! */
1031
	ifmgd->associated->channel = sdata->csa_chandef.chan;
1032

1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052
	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);
1053

1054 1055 1056 1057 1058
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
1059

1060 1061 1062
	sdata->vif.csa_active = false;
	ifmgd->csa_waiting_bcn = false;

1063 1064 1065 1066 1067 1068
	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);
1069
		return;
1070
	}
1071 1072

	cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1073 1074
}

1075 1076
void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
{
J
Johannes Berg 已提交
1077 1078
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1079 1080 1081

	trace_api_chswitch_done(sdata, success);
	if (!success) {
1082 1083 1084 1085 1086 1087
		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);
1088 1089 1090 1091
	}
}
EXPORT_SYMBOL(ieee80211_chswitch_done);

1092 1093 1094 1095
static void ieee80211_chswitch_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
1096

1097
	ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1098 1099
}

1100
static void
J
Johannes Berg 已提交
1101
ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1102 1103
				 u64 timestamp, u32 device_timestamp,
				 struct ieee802_11_elems *elems,
1104
				 bool beacon)
1105
{
1106
	struct ieee80211_local *local = sdata->local;
1107
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1108
	struct cfg80211_bss *cbss = ifmgd->associated;
1109
	struct ieee80211_chanctx_conf *conf;
J
Johannes Berg 已提交
1110
	struct ieee80211_chanctx *chanctx;
1111
	enum nl80211_band current_band;
1112
	struct ieee80211_csa_ie csa_ie;
1113
	struct ieee80211_channel_switch ch_switch;
1114
	int res;
1115

1116
	sdata_assert_lock(sdata);
1117

1118
	if (!cbss)
1119 1120
		return;

1121
	if (local->scanning)
1122 1123
		return;

1124
	/* disregard subsequent announcements if we are already processing */
1125
	if (sdata->vif.csa_active)
1126 1127
		return;

1128
	current_band = cbss->channel->band;
1129
	memset(&csa_ie, 0, sizeof(csa_ie));
1130
	res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1131
					   ifmgd->flags,
1132
					   ifmgd->associated->bssid, &csa_ie);
1133
	if (res	< 0)
1134
		ieee80211_queue_work(&local->hw,
1135
				     &ifmgd->csa_connection_drop_work);
1136
	if (res)
1137
		return;
1138

1139
	if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1140 1141 1142
				     IEEE80211_CHAN_DISABLED)) {
		sdata_info(sdata,
			   "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1143
			   ifmgd->associated->bssid,
1144 1145 1146
			   csa_ie.chandef.chan->center_freq,
			   csa_ie.chandef.width, csa_ie.chandef.center_freq1,
			   csa_ie.chandef.center_freq2);
1147 1148 1149 1150 1151
		ieee80211_queue_work(&local->hw,
				     &ifmgd->csa_connection_drop_work);
		return;
	}

1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162
	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;
	}

1163 1164 1165 1166 1167 1168 1169 1170
	/*
	 * 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);

1171
	mutex_lock(&local->mtx);
1172
	mutex_lock(&local->chanctx_mtx);
1173 1174 1175 1176 1177
	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");
1178
		goto drop_connection;
1179 1180 1181 1182
	}

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

1183
	if (local->use_chanctx &&
1184
	    !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1185 1186
		sdata_info(sdata,
			   "driver doesn't support chan-switch with channel contexts\n");
1187
		goto drop_connection;
J
Johannes Berg 已提交
1188 1189
	}

1190 1191 1192 1193 1194 1195 1196 1197 1198
	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");
1199
		goto drop_connection;
1200 1201
	}

1202 1203 1204
	res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
					    chanctx->mode, false);
	if (res) {
J
Johannes Berg 已提交
1205
		sdata_info(sdata,
1206 1207
			   "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
			   res);
1208
		goto drop_connection;
J
Johannes Berg 已提交
1209
	}
1210
	mutex_unlock(&local->chanctx_mtx);
J
Johannes Berg 已提交
1211

1212
	sdata->vif.csa_active = true;
1213
	sdata->csa_chandef = csa_ie.chandef;
1214
	sdata->csa_block_tx = csa_ie.mode;
1215
	ifmgd->csa_ignored_same_chan = false;
J
Johannes Berg 已提交
1216

1217
	if (sdata->csa_block_tx)
1218 1219
		ieee80211_stop_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
1220
	mutex_unlock(&local->mtx);
1221

1222 1223 1224
	cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
					  csa_ie.count);

1225
	if (local->ops->channel_switch) {
1226
		/* use driver's channel switch callback */
1227
		drv_channel_switch(local, sdata, &ch_switch);
1228 1229 1230 1231
		return;
	}

	/* channel switch handled in software */
1232
	if (csa_ie.count <= 1)
1233
		ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1234
	else
1235
		mod_timer(&ifmgd->chswitch_timer,
1236 1237
			  TU_TO_EXP_TIME((csa_ie.count - 1) *
					 cbss->beacon_interval));
1238 1239 1240 1241 1242
	return;
 drop_connection:
	ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
	mutex_unlock(&local->chanctx_mtx);
	mutex_unlock(&local->mtx);
1243 1244
}

1245 1246 1247 1248 1249 1250
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)
1251
{
1252 1253
	struct ieee80211_country_ie_triplet *triplet;
	int chan = ieee80211_frequency_to_channel(channel->center_freq);
1254
	int i, chan_increment;
1255
	bool have_chan_pwr = false;
1256

1257 1258
	/* Invalid IE */
	if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1259
		return false;
1260

1261 1262 1263 1264 1265 1266 1267
	triplet = (void *)(country_ie + 3);
	country_ie_len -= 3;

	switch (channel->band) {
	default:
		WARN_ON_ONCE(1);
		/* fall through */
1268 1269
	case NL80211_BAND_2GHZ:
	case NL80211_BAND_60GHZ:
1270 1271
		chan_increment = 1;
		break;
1272
	case NL80211_BAND_5GHZ:
1273 1274
		chan_increment = 4;
		break;
1275
	}
1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286

	/* 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;
1287
				*chan_pwr = triplet->chans.max_power;
1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298
				break;
			}
		}
		if (have_chan_pwr)
			break;

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

1299
	if (have_chan_pwr && pwr_constr_elem)
1300
		*pwr_reduction = *pwr_constr_elem;
1301 1302 1303
	else
		*pwr_reduction = 0;

1304 1305 1306
	return have_chan_pwr;
}

1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320
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];
}

1321 1322 1323 1324
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,
1325 1326
				       const u8 *pwr_constr_ie,
				       const u8 *cisco_dtpc_ie)
1327
{
1328 1329 1330
	bool has_80211h_pwr = false, has_cisco_pwr = false;
	int chan_pwr = 0, pwr_reduction_80211h = 0;
	int pwr_level_cisco, pwr_level_80211h;
1331
	int new_ap_level;
1332
	__le16 capab = mgmt->u.probe_resp.capab_info;
1333

1334 1335 1336
	if (country_ie &&
	    (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
	     capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1337 1338 1339
		has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
			sdata, channel, country_ie, country_ie_len,
			pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1340 1341 1342 1343 1344 1345 1346 1347
		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;
1348
	}
1349

1350
	if (!has_80211h_pwr && !has_cisco_pwr)
1351
		return 0;
1352

1353 1354 1355 1356 1357
	/* 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)) {
1358 1359 1360 1361 1362
		new_ap_level = pwr_level_80211h;

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

1363 1364 1365 1366
		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);
1367
	} else {  /* has_cisco_pwr is always true here. */
1368 1369 1370 1371 1372
		new_ap_level = pwr_level_cisco;

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

1373 1374 1375
		sdata_dbg(sdata,
			  "Limiting TX power to %d dBm as advertised by %pM\n",
			  pwr_level_cisco, sdata->u.mgd.bssid);
1376
	}
1377

1378 1379 1380 1381
	sdata->ap_power_level = new_ap_level;
	if (__ieee80211_recalc_txpower(sdata))
		return BSS_CHANGED_TXPOWER;
	return 0;
1382 1383
}

1384 1385 1386 1387 1388 1389
/* 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
1390 1391 1392 1393
	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
1394
	if (local->scanning)
J
Johannes Berg 已提交
1395 1396
		return;

1397
	if (conf->dynamic_ps_timeout > 0 &&
1398
	    !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1399 1400 1401
		mod_timer(&local->dynamic_ps_timer, jiffies +
			  msecs_to_jiffies(conf->dynamic_ps_timeout));
	} else {
1402
		if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1403
			ieee80211_send_nullfunc(local, sdata, true);
1404

1405 1406
		if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
		    ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1407 1408 1409 1410
			return;

		conf->flags |= IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427
	}
}

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);
	}
}

1428 1429 1430 1431
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
1432
	bool authorized = false;
1433 1434 1435 1436

	if (!mgd->powersave)
		return false;

1437 1438 1439
	if (mgd->broken_ap)
		return false;

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

1443
	if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1444 1445
		return false;

1446
	if (!mgd->have_beacon)
1447 1448
		return false;

1449 1450 1451
	rcu_read_lock();
	sta = sta_info_get(sdata, mgd->bssid);
	if (sta)
J
Johannes Berg 已提交
1452
		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1453 1454
	rcu_read_unlock();

J
Johannes Berg 已提交
1455
	return authorized;
1456 1457
}

1458
/* need to hold RTNL or interface lock */
J
Johannes Berg 已提交
1459
void ieee80211_recalc_ps(struct ieee80211_local *local)
1460 1461 1462
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;
1463
	int timeout;
1464

1465
	if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1466 1467 1468 1469 1470
		local->ps_sdata = NULL;
		return;
	}

	list_for_each_entry(sdata, &local->interfaces, list) {
1471
		if (!ieee80211_sdata_running(sdata))
1472
			continue;
1473 1474 1475 1476 1477 1478 1479 1480
		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;
		}
1481 1482 1483 1484 1485 1486
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

1487
	if (count == 1 && ieee80211_powersave_allowed(found)) {
J
Johannes Berg 已提交
1488
		u8 dtimper = found->u.mgd.dtim_period;
1489

1490
		timeout = local->dynamic_ps_forced_timeout;
J
Johannes Berg 已提交
1491 1492
		if (timeout < 0)
			timeout = 100;
1493
		local->hw.conf.dynamic_ps_timeout = timeout;
1494

J
Johannes Berg 已提交
1495 1496 1497 1498 1499 1500
		/* 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;
1501
	} else {
1502
		local->ps_sdata = NULL;
1503
	}
1504 1505 1506 1507

	ieee80211_change_ps(local);
}

E
Eliad Peller 已提交
1508 1509 1510 1511 1512 1513 1514 1515 1516 1517
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);
	}
}

1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529
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,
1530
					IEEE80211_MAX_QUEUE_MAP,
1531 1532
					IEEE80211_QUEUE_STOP_REASON_PS,
					false);
1533 1534 1535 1536 1537 1538 1539 1540
}

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;
1541
	struct ieee80211_if_managed *ifmgd;
1542 1543
	unsigned long flags;
	int q;
1544 1545 1546 1547 1548

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

1549 1550
	ifmgd = &sdata->u.mgd;

1551 1552 1553
	if (local->hw.conf.flags & IEEE80211_CONF_PS)
		return;

1554
	if (local->hw.conf.dynamic_ps_timeout > 0) {
1555 1556
		/* don't enter PS if TX frames are pending */
		if (drv_tx_frames_pending(local)) {
1557 1558 1559 1560 1561
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
			return;
		}
1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579

		/*
		 * 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);
1580 1581
	}

1582
	if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1583
	    !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1584
		if (drv_tx_frames_pending(local)) {
1585 1586 1587
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
1588
		} else {
1589
			ieee80211_send_nullfunc(local, sdata, true);
1590
			/* Flush to get the tx status of nullfunc frame */
1591
			ieee80211_flush_queues(local, sdata, false);
1592
		}
1593 1594
	}

1595 1596
	if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
	      ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1597 1598 1599 1600 1601
	    (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);
	}
1602 1603 1604 1605 1606 1607
}

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

1608
	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1609 1610
}

1611 1612
void ieee80211_dfs_cac_timer_work(struct work_struct *work)
{
1613
	struct delayed_work *delayed_work = to_delayed_work(work);
1614 1615 1616
	struct ieee80211_sub_if_data *sdata =
		container_of(delayed_work, struct ieee80211_sub_if_data,
			     dfs_cac_timer_work);
1617
	struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1618

1619 1620 1621 1622 1623 1624 1625 1626
	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);
1627 1628
}

1629 1630 1631 1632 1633
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;
1634
	bool ret = false;
1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678
	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;
1679 1680 1681 1682 1683 1684
			/* 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.
1685
			 */
1686 1687
			if (non_acm_ac >= IEEE80211_NUM_ACS)
				non_acm_ac = IEEE80211_AC_BK;
1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721
			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
1722
/* MLME */
1723
static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1724
				     struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
1725
				     const u8 *wmm_param, size_t wmm_param_len)
1726
{
1727
	struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1728
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1729
	size_t left;
1730
	int count, ac;
J
Johannes Berg 已提交
1731 1732
	const u8 *pos;
	u8 uapsd_queues = 0;
1733

1734
	if (!local->ops->conf_tx)
1735
		return false;
1736

J
Johannes Berg 已提交
1737
	if (local->hw.queues < IEEE80211_NUM_ACS)
1738
		return false;
1739 1740

	if (!wmm_param)
1741
		return false;
1742

1743
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1744
		return false;
K
Kalle Valo 已提交
1745 1746

	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1747
		uapsd_queues = ifmgd->uapsd_queues;
K
Kalle Valo 已提交
1748

1749
	count = wmm_param[6] & 0x0f;
1750
	if (count == ifmgd->wmm_last_param_set)
1751
		return false;
1752
	ifmgd->wmm_last_param_set = count;
1753 1754 1755 1756 1757 1758

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

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

Y
Yoni Divinsky 已提交
1759
	sdata->wmm_acm = 0;
1760 1761 1762
	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
1763
		bool uapsd = false;
1764 1765

		switch (aci) {
1766
		case 1: /* AC_BK */
1767
			ac = IEEE80211_AC_BK;
J
Johannes Berg 已提交
1768
			if (acm)
Y
Yoni Divinsky 已提交
1769
				sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
K
Kalle Valo 已提交
1770 1771
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
				uapsd = true;
1772
			break;
1773
		case 2: /* AC_VI */
1774
			ac = IEEE80211_AC_VI;
J
Johannes Berg 已提交
1775
			if (acm)
Y
Yoni Divinsky 已提交
1776
				sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
K
Kalle Valo 已提交
1777 1778
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
				uapsd = true;
1779
			break;
1780
		case 3: /* AC_VO */
1781
			ac = IEEE80211_AC_VO;
J
Johannes Berg 已提交
1782
			if (acm)
Y
Yoni Divinsky 已提交
1783
				sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
K
Kalle Valo 已提交
1784 1785
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
				uapsd = true;
1786
			break;
1787
		case 0: /* AC_BE */
1788
		default:
1789
			ac = IEEE80211_AC_BE;
J
Johannes Berg 已提交
1790
			if (acm)
Y
Yoni Divinsky 已提交
1791
				sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
K
Kalle Valo 已提交
1792 1793
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
				uapsd = true;
1794 1795 1796
			break;
		}

1797
		params[ac].aifs = pos[0] & 0x0f;
1798

1799
		if (params[ac].aifs < 2) {
1800 1801
			sdata_info(sdata,
				   "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1802 1803
				   params[ac].aifs, aci);
			params[ac].aifs = 2;
1804
		}
1805 1806 1807 1808 1809
		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
1810

1811 1812 1813 1814 1815 1816 1817 1818 1819
		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
1820
		mlme_dbg(sdata,
1821 1822 1823 1824 1825 1826 1827 1828
			 "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
1829
			sdata_err(sdata,
1830 1831
				  "failed to set TX queue parameters for AC %d\n",
				  ac);
1832
	}
1833 1834

	/* enable WMM or activate new settings */
1835
	sdata->vif.bss_conf.qos = true;
1836
	return true;
1837 1838
}

1839 1840 1841 1842
static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
{
	lockdep_assert_held(&sdata->local->mtx);

1843
	sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1844 1845 1846 1847 1848 1849 1850 1851 1852 1853
	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
1854 1855
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
1856
{
J
Johannes Berg 已提交
1857
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1858
	struct ieee80211_supported_band *sband;
1859
	u32 changed = 0;
J
Johannes Berg 已提交
1860 1861 1862 1863
	bool use_protection;
	bool use_short_preamble;
	bool use_short_slot;

1864 1865 1866 1867
	sband = ieee80211_get_sband(sdata);
	if (!sband)
		return changed;

J
Johannes Berg 已提交
1868 1869 1870 1871 1872 1873 1874 1875 1876
	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);
1877
	if (sband->band == NL80211_BAND_5GHZ)
1878
		use_short_slot = true;
1879

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

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

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

	return changed;
}

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

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

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

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

1916 1917
	ieee80211_check_rate_mask(sdata);

1918 1919
	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;

1920 1921
	if (sdata->vif.p2p ||
	    sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
1922
		const struct cfg80211_bss_ies *ies;
1923

1924 1925 1926 1927 1928 1929 1930 1931
		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
1932 1933
					(u8 *) &bss_conf->p2p_noa_attr,
					sizeof(bss_conf->p2p_noa_attr));
1934
			if (ret >= 2) {
J
Janusz Dziedzic 已提交
1935 1936
				sdata->u.mgd.p2p_noa_index =
					bss_conf->p2p_noa_attr.index;
1937 1938
				bss_info_changed |= BSS_CHANGED_P2P_PS;
			}
1939
		}
1940
		rcu_read_unlock();
1941 1942
	}

J
Johannes Berg 已提交
1943
	/* just to be sure */
1944
	ieee80211_stop_poll(sdata);
J
Johannes Berg 已提交
1945

1946
	ieee80211_led_assoc(local, 1);
1947

1948
	if (sdata->u.mgd.have_beacon) {
1949 1950 1951 1952 1953 1954 1955
		/*
		 * 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;
1956
		bss_conf->beacon_rate = bss->beacon_rate;
1957
		bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1958
	} else {
1959
		bss_conf->beacon_rate = NULL;
1960
		bss_conf->dtim_period = 0;
1961
	}
1962

1963
	bss_conf->assoc = 1;
1964

1965
	/* Tell the driver to monitor connection quality (if supported) */
1966
	if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1967
	    bss_conf->cqm_rssi_thold)
1968 1969
		bss_info_changed |= BSS_CHANGED_CQM;

1970
	/* Enable ARP filtering */
1971
	if (bss_conf->arp_addr_cnt)
1972 1973
		bss_info_changed |= BSS_CHANGED_ARP_FILTER;

J
Johannes Berg 已提交
1974
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1975

J
Johannes Berg 已提交
1976
	mutex_lock(&local->iflist_mtx);
J
Johannes Berg 已提交
1977
	ieee80211_recalc_ps(local);
J
Johannes Berg 已提交
1978
	mutex_unlock(&local->iflist_mtx);
1979

1980
	ieee80211_recalc_smps(sdata);
E
Eliad Peller 已提交
1981 1982
	ieee80211_recalc_ps_vif(sdata);

1983
	netif_carrier_on(sdata->dev);
1984 1985
}

1986
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1987 1988
				   u16 stype, u16 reason, bool tx,
				   u8 *frame_buf)
1989
{
1990
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1991
	struct ieee80211_local *local = sdata->local;
1992
	u32 changed = 0;
1993

1994
	sdata_assert_lock(sdata);
1995

1996 1997 1998
	if (WARN_ON_ONCE(tx && !frame_buf))
		return;

J
Johannes Berg 已提交
1999 2000 2001
	if (WARN_ON(!ifmgd->associated))
		return;

2002 2003
	ieee80211_stop_poll(sdata);

2004
	ifmgd->associated = NULL;
2005 2006
	netif_carrier_off(sdata->dev);

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
	/*
	 * 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
2018 2019 2020
	/* disable per-vif ps */
	ieee80211_recalc_ps_vif(sdata);

2021 2022 2023
	/* make sure ongoing transmission finishes */
	synchronize_net();

2024 2025 2026 2027 2028 2029
	/*
	 * 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.
	 */
2030
	if (tx)
2031
		ieee80211_flush_queues(local, sdata, true);
2032

2033 2034
	/* deauthenticate/disassociate now */
	if (tx || frame_buf)
2035 2036
		ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
					       reason, tx, frame_buf);
2037

2038
	/* flush out frame - make sure the deauth was actually sent */
2039
	if (tx)
2040
		ieee80211_flush_queues(local, sdata, false);
2041

2042
	/* clear bssid only after building the needed mgmt frames */
2043
	eth_zero_addr(ifmgd->bssid);
2044

2045
	/* remove AP and TDLS peers */
2046
	sta_info_flush(sdata);
2047 2048

	/* finally reset all BSS / config parameters */
2049 2050 2051
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
J
Johannes Berg 已提交
2052 2053
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
2054

J
Janusz Dziedzic 已提交
2055 2056 2057
	ifmgd->p2p_noa_index = -1;
	memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
	       sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2058

2059
	/* on the next assoc, re-program HT/VHT parameters */
B
Ben Greear 已提交
2060 2061
	memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
	memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2062 2063
	memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
	memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2064 2065 2066 2067 2068 2069 2070

	/* 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;
2071
	sdata->vif.mu_mimo_owner = false;
2072

2073
	sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2074

2075 2076 2077
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

2078
	/* Disable ARP filtering */
2079
	if (sdata->vif.bss_conf.arp_addr_cnt)
2080 2081
		changed |= BSS_CHANGED_ARP_FILTER;

2082 2083 2084
	sdata->vif.bss_conf.qos = false;
	changed |= BSS_CHANGED_QOS;

2085 2086
	/* The BSSID (not really interesting) and HT changed */
	changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
J
Johannes Berg 已提交
2087
	ieee80211_bss_info_change_notify(sdata, changed);
2088

2089
	/* disassociated - set to defaults now */
2090
	ieee80211_set_wmm_default(sdata, false, false);
2091

2092 2093 2094 2095
	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);
2096

2097
	sdata->vif.bss_conf.dtim_period = 0;
2098 2099
	sdata->vif.bss_conf.beacon_rate = NULL;

2100
	ifmgd->have_beacon = false;
2101

2102
	ifmgd->flags = 0;
2103
	mutex_lock(&local->mtx);
2104
	ieee80211_vif_release_channel(sdata);
2105 2106

	sdata->vif.csa_active = false;
2107
	ifmgd->csa_waiting_bcn = false;
2108
	ifmgd->csa_ignored_same_chan = false;
2109 2110 2111 2112 2113
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
2114
	mutex_unlock(&local->mtx);
2115

2116 2117 2118 2119
	/* existing TX TSPEC sessions no longer exist */
	memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
	cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);

2120
	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2121
}
2122

2123 2124 2125 2126 2127 2128 2129 2130
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
2131 2132
	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
2133
	 */
J
Johannes Berg 已提交
2134 2135 2136
	if (is_multicast_ether_addr(hdr->addr1))
		return;

2137
	ieee80211_sta_reset_conn_monitor(sdata);
2138
}
2139

2140 2141 2142
static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2143
	struct ieee80211_local *local = sdata->local;
2144

2145
	mutex_lock(&local->mtx);
2146 2147
	if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
		goto out;
2148

2149
	__ieee80211_stop_poll(sdata);
2150 2151

	mutex_lock(&local->iflist_mtx);
J
Johannes Berg 已提交
2152
	ieee80211_recalc_ps(local);
2153
	mutex_unlock(&local->iflist_mtx);
2154

2155
	if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2156
		goto out;
2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167

	/*
	 * 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));
2168 2169
out:
	mutex_unlock(&local->mtx);
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 2202 2203 2204 2205 2206
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);
	}
}

2207
void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2208
			     struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2209
{
2210 2211
	ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);

F
Felix Fietkau 已提交
2212
	if (!ieee80211_is_data(hdr->frame_control))
2213 2214 2215 2216
	    return;

	if (ieee80211_is_nullfunc(hdr->frame_control) &&
	    sdata->u.mgd.probe_send_count > 0) {
2217
		if (ack)
2218
			ieee80211_sta_reset_conn_monitor(sdata);
2219 2220
		else
			sdata->u.mgd.nullfunc_failed = true;
2221
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2222
		return;
2223
	}
2224 2225 2226

	if (ack)
		ieee80211_sta_reset_conn_monitor(sdata);
2227 2228
}

2229 2230 2231 2232
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ssid;
2233
	u8 *dst = ifmgd->associated->bssid;
2234
	u8 unicast_limit = max(1, max_probe_tries - 3);
J
Johannes Berg 已提交
2235
	struct sta_info *sta;
2236 2237 2238 2239 2240 2241 2242 2243

	/*
	 * 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;
2244

2245 2246 2247 2248 2249 2250 2251
	/*
	 * 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.
	 */
2252 2253
	ifmgd->probe_send_count++;

J
Johannes Berg 已提交
2254 2255 2256 2257 2258 2259 2260 2261
	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);
	}

2262
	if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2263
		ifmgd->nullfunc_failed = false;
2264
		ieee80211_send_nullfunc(sdata->local, sdata, false);
2265
	} else {
2266 2267
		int ssid_len;

2268
		rcu_read_lock();
2269
		ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2270 2271 2272 2273 2274
		if (WARN_ON_ONCE(ssid == NULL))
			ssid_len = 0;
		else
			ssid_len = ssid[1];

2275
		ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2276
					 ssid + 2, ssid_len, NULL,
2277
					 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
2278
					 ifmgd->associated->channel, false);
2279
		rcu_read_unlock();
2280
	}
2281

2282
	ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2283
	run_again(sdata, ifmgd->probe_timeout);
2284 2285
}

J
Johannes Berg 已提交
2286 2287
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
				   bool beacon)
2288 2289
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
2290
	bool already = false;
2291

2292
	if (!ieee80211_sdata_running(sdata))
2293 2294
		return;

2295
	sdata_lock(sdata);
2296 2297 2298 2299

	if (!ifmgd->associated)
		goto out;

2300 2301 2302 2303 2304 2305 2306
	mutex_lock(&sdata->local->mtx);

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

2307
	if (beacon) {
J
Johannes Berg 已提交
2308
		mlme_dbg_ratelimited(sdata,
2309 2310
				     "detected beacon loss from AP (missed %d beacons) - probing\n",
				     beacon_loss_count);
J
Johannes Berg 已提交
2311

2312
		ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2313
	}
2314

J
Johannes Berg 已提交
2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325
	/*
	 * 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!
	 */
2326
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
J
Johannes Berg 已提交
2327 2328
		already = true;

E
Eliad Peller 已提交
2329 2330
	ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;

2331 2332
	mutex_unlock(&sdata->local->mtx);

J
Johannes Berg 已提交
2333 2334 2335
	if (already)
		goto out;

2336
	mutex_lock(&sdata->local->iflist_mtx);
J
Johannes Berg 已提交
2337
	ieee80211_recalc_ps(sdata->local);
2338 2339
	mutex_unlock(&sdata->local->iflist_mtx);

2340 2341
	ifmgd->probe_send_count = 0;
	ieee80211_mgd_probe_ap_send(sdata);
2342
 out:
2343
	sdata_unlock(sdata);
2344 2345
}

2346 2347 2348 2349 2350
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;
2351
	struct cfg80211_bss *cbss;
2352 2353
	struct sk_buff *skb;
	const u8 *ssid;
2354
	int ssid_len;
2355 2356 2357 2358

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

2359
	sdata_assert_lock(sdata);
2360

2361 2362 2363 2364 2365 2366 2367
	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
2368 2369
		return NULL;

2370
	rcu_read_lock();
2371
	ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2372 2373 2374 2375 2376
	if (WARN_ON_ONCE(ssid == NULL))
		ssid_len = 0;
	else
		ssid_len = ssid[1];

2377
	skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
J
Johannes Berg 已提交
2378
					(u32) -1, cbss->channel,
2379
					ssid + 2, ssid_len,
2380
					NULL, 0, true);
2381
	rcu_read_unlock();
2382 2383 2384 2385 2386

	return skb;
}
EXPORT_SYMBOL(ieee80211_ap_probereq_get);

2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404
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);
}

2405
static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2406
{
2407
	struct ieee80211_local *local = sdata->local;
2408
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2409
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2410

2411
	sdata_lock(sdata);
2412
	if (!ifmgd->associated) {
2413
		sdata_unlock(sdata);
2414 2415 2416
		return;
	}

2417 2418 2419 2420 2421
	/* 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);

2422 2423
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
			       WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2424
			       true, frame_buf);
2425
	mutex_lock(&local->mtx);
2426
	sdata->vif.csa_active = false;
2427
	ifmgd->csa_waiting_bcn = false;
2428 2429 2430 2431 2432
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
2433
	mutex_unlock(&local->mtx);
2434

2435 2436 2437
	ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
				    WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);

2438
	sdata_unlock(sdata);
2439 2440
}

2441
static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
J
Johannes Berg 已提交
2442 2443 2444
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
2445
			     u.mgd.beacon_connection_loss_work);
2446 2447
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

2448 2449
	if (ifmgd->associated)
		ifmgd->beacon_loss_count++;
J
Johannes Berg 已提交
2450

2451
	if (ifmgd->connection_loss) {
2452 2453
		sdata_info(sdata, "Connection to AP %pM lost\n",
			   ifmgd->bssid);
2454
		__ieee80211_disconnect(sdata);
2455
	} else {
2456
		ieee80211_mgd_probe_ap(sdata, true);
2457 2458 2459 2460 2461 2462 2463 2464 2465
	}
}

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);

2466
	__ieee80211_disconnect(sdata);
J
Johannes Berg 已提交
2467 2468
}

2469 2470 2471
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2472
	struct ieee80211_hw *hw = &sdata->local->hw;
2473

J
Johannes Berg 已提交
2474 2475
	trace_api_beacon_loss(sdata);

2476
	sdata->u.mgd.connection_loss = false;
2477
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2478 2479 2480
}
EXPORT_SYMBOL(ieee80211_beacon_loss);

2481 2482 2483 2484 2485
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
2486 2487
	trace_api_connection_loss(sdata);

2488
	sdata->u.mgd.connection_loss = true;
2489 2490 2491 2492 2493
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_connection_loss);


J
Johannes Berg 已提交
2494 2495 2496 2497 2498
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;

2499
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2500 2501

	if (!assoc) {
2502 2503 2504 2505 2506 2507
		/*
		 * 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
2508 2509
		sta_info_destroy_addr(sdata, auth_data->bss->bssid);

2510
		eth_zero_addr(sdata->u.mgd.bssid);
J
Johannes Berg 已提交
2511
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2512
		sdata->u.mgd.flags = 0;
2513
		mutex_lock(&sdata->local->mtx);
J
Johannes Berg 已提交
2514
		ieee80211_vif_release_channel(sdata);
2515
		mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
2516 2517
	}

2518
	cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
J
Johannes Berg 已提交
2519 2520 2521 2522
	kfree(auth_data);
	sdata->u.mgd.auth_data = NULL;
}

2523
static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2524
					 bool assoc, bool abandon)
2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541
{
	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;
2542 2543
		sdata->vif.mu_mimo_owner = false;

2544 2545 2546
		mutex_lock(&sdata->local->mtx);
		ieee80211_vif_release_channel(sdata);
		mutex_unlock(&sdata->local->mtx);
2547 2548 2549

		if (abandon)
			cfg80211_abandon_assoc(sdata->dev, assoc_data->bss);
2550 2551 2552 2553 2554 2555
	}

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

J
Johannes Berg 已提交
2556 2557 2558
static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
{
2559
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
2560 2561 2562
	struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
	u8 *pos;
	struct ieee802_11_elems elems;
2563
	u32 tx_flags = 0;
J
Johannes Berg 已提交
2564 2565

	pos = mgmt->u.auth.variable;
2566
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2567 2568 2569
	if (!elems.challenge)
		return;
	auth_data->expected_transaction = 4;
J
Johannes Berg 已提交
2570
	drv_mgd_prepare_tx(sdata->local, sdata);
2571
	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2572 2573
		tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
			   IEEE80211_TX_INTFL_MLME_CONN_TX;
2574
	ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
J
Johannes Berg 已提交
2575 2576 2577
			    elems.challenge - 2, elems.challenge_len + 2,
			    auth_data->bss->bssid, auth_data->bss->bssid,
			    auth_data->key, auth_data->key_len,
2578
			    auth_data->key_idx, tx_flags);
J
Johannes Berg 已提交
2579 2580
}

2581 2582
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
2583 2584 2585 2586 2587
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u8 bssid[ETH_ALEN];
	u16 auth_alg, auth_transaction, status_code;
	struct sta_info *sta;
2588 2589 2590 2591
	struct ieee80211_event event = {
		.type = MLME_EVENT,
		.u.mlme.data = AUTH_EVENT,
	};
J
Johannes Berg 已提交
2592

2593
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2594 2595

	if (len < 24 + 6)
2596
		return;
J
Johannes Berg 已提交
2597 2598

	if (!ifmgd->auth_data || ifmgd->auth_data->done)
2599
		return;
J
Johannes Berg 已提交
2600 2601 2602

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

2603
	if (!ether_addr_equal(bssid, mgmt->bssid))
2604
		return;
J
Johannes Berg 已提交
2605 2606 2607 2608 2609 2610

	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 ||
2611 2612 2613 2614 2615
	    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);
2616
		return;
2617
	}
J
Johannes Berg 已提交
2618 2619

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
2620 2621
		sdata_info(sdata, "%pM denied authentication (status %d)\n",
			   mgmt->sa, status_code);
2622
		ieee80211_destroy_auth_data(sdata, false);
2623
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2624 2625 2626
		event.u.mlme.status = MLME_DENIED;
		event.u.mlme.reason = status_code;
		drv_event_callback(sdata->local, sdata, &event);
2627
		return;
J
Johannes Berg 已提交
2628 2629 2630 2631 2632 2633
	}

	switch (ifmgd->auth_data->algorithm) {
	case WLAN_AUTH_OPEN:
	case WLAN_AUTH_LEAP:
	case WLAN_AUTH_FT:
2634
	case WLAN_AUTH_SAE:
2635 2636 2637
	case WLAN_AUTH_FILS_SK:
	case WLAN_AUTH_FILS_SK_PFS:
	case WLAN_AUTH_FILS_PK:
J
Johannes Berg 已提交
2638 2639 2640 2641 2642
		break;
	case WLAN_AUTH_SHARED_KEY:
		if (ifmgd->auth_data->expected_transaction != 4) {
			ieee80211_auth_challenge(sdata, mgmt, len);
			/* need another frame */
2643
			return;
J
Johannes Berg 已提交
2644 2645 2646 2647 2648
		}
		break;
	default:
		WARN_ONCE(1, "invalid auth alg %d",
			  ifmgd->auth_data->algorithm);
2649
		return;
J
Johannes Berg 已提交
2650 2651
	}

2652 2653
	event.u.mlme.status = MLME_SUCCESS;
	drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
2654
	sdata_info(sdata, "authenticated\n");
J
Johannes Berg 已提交
2655 2656
	ifmgd->auth_data->done = true;
	ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2657
	ifmgd->auth_data->timeout_started = true;
2658
	run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
2659

2660 2661 2662 2663 2664 2665
	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.
		 */
2666
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2667
		return;
2668 2669
	}

J
Johannes Berg 已提交
2670 2671 2672 2673 2674 2675 2676 2677
	/* 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
2678
		sdata_info(sdata, "failed moving %pM to auth\n", bssid);
J
Johannes Berg 已提交
2679 2680 2681 2682
		goto out_err;
	}
	mutex_unlock(&sdata->local->sta_mtx);

2683
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2684
	return;
J
Johannes Berg 已提交
2685 2686 2687 2688 2689
 out_err:
	mutex_unlock(&sdata->local->sta_mtx);
	/* ignore frame -- wait for timeout */
}

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 2741 2742 2743 2744 2745
#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
2746

2747 2748
static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
2749
{
2750
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2751
	u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2752

2753
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2754

2755
	if (len < 24 + 2)
2756
		return;
2757

2758 2759 2760
	if (ifmgd->associated &&
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
		const u8 *bssid = ifmgd->associated->bssid;
2761

2762 2763 2764
		sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
			   bssid, reason_code,
			   ieee80211_get_reason_code_string(reason_code));
2765

2766
		ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2767

2768 2769 2770 2771
		ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
					    reason_code);
		return;
	}
2772

2773 2774 2775
	if (ifmgd->assoc_data &&
	    ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
		const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2776

2777 2778 2779 2780 2781
		sdata_info(sdata,
			   "deauthenticated from %pM while associating (Reason: %u=%s)\n",
			   bssid, reason_code,
			   ieee80211_get_reason_code_string(reason_code));

2782
		ieee80211_destroy_assoc_data(sdata, false, true);
2783 2784 2785 2786

		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
		return;
	}
2787 2788 2789
}


2790 2791
static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_mgmt *mgmt, size_t len)
2792
{
2793
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2794 2795
	u16 reason_code;

2796
	sdata_assert_lock(sdata);
2797

J
Johannes Berg 已提交
2798
	if (len < 24 + 2)
2799
		return;
2800

J
Johannes Berg 已提交
2801
	if (!ifmgd->associated ||
2802
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2803
		return;
2804 2805 2806

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

2807 2808 2809
	sdata_info(sdata, "disassociated from %pM (Reason: %u=%s)\n",
		   mgmt->sa, reason_code,
		   ieee80211_get_reason_code_string(reason_code));
2810

2811 2812
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2813
	ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2814 2815
}

2816 2817 2818 2819
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,
2820 2821
				int *min_rate, int *min_rate_index,
				int shift, u32 rate_flags)
2822 2823 2824 2825
{
	int i, j;

	for (i = 0; i < supp_rates_len; i++) {
2826
		int rate = supp_rates[i] & 0x7f;
2827 2828
		bool is_basic = !!(supp_rates[i] & 0x80);

2829
		if ((rate * 5 * (1 << shift)) > 110)
2830 2831 2832
			*have_higher_than_11mbit = true;

		/*
2833 2834
		 * Skip HT and VHT BSS membership selectors since they're not
		 * rates.
2835
		 *
2836
		 * Note: Even though the membership selector and the basic
2837 2838 2839
		 *	 rate flag share the same bit, they are not exactly
		 *	 the same.
		 */
2840 2841
		if (supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_HT_PHY) ||
		    supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_VHT_PHY))
2842 2843 2844
			continue;

		for (j = 0; j < sband->n_bitrates; j++) {
2845 2846 2847 2848 2849 2850 2851 2852 2853
			struct ieee80211_rate *br;
			int brate;

			br = &sband->bitrates[j];
			if ((rate_flags & br->flags) != rate_flags)
				continue;

			brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
			if (brate == rate) {
2854 2855 2856
				*rates |= BIT(j);
				if (is_basic)
					*basic_rates |= BIT(j);
2857 2858
				if ((rate * 5) < *min_rate) {
					*min_rate = rate * 5;
2859 2860 2861 2862 2863 2864 2865
					*min_rate_index = j;
				}
				break;
			}
		}
	}
}
2866

J
Johannes Berg 已提交
2867 2868
static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
				    struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
2869
				    struct ieee80211_mgmt *mgmt, size_t len)
2870
{
2871
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2872
	struct ieee80211_local *local = sdata->local;
2873
	struct ieee80211_supported_band *sband;
2874
	struct sta_info *sta;
J
Johannes Berg 已提交
2875 2876
	u8 *pos;
	u16 capab_info, aid;
2877
	struct ieee802_11_elems elems;
J
Johannes Berg 已提交
2878
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2879 2880
	const struct cfg80211_bss_ies *bss_ies = NULL;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
J
Johannes Berg 已提交
2881
	u32 changed = 0;
2882
	int err;
2883
	bool ret;
2884

J
Johannes Berg 已提交
2885
	/* AssocResp and ReassocResp have identical structure */
2886 2887

	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
J
Johannes Berg 已提交
2888
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2889

2890
	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
J
Johannes Berg 已提交
2891 2892
		sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
			   aid);
2893 2894
	aid &= ~(BIT(15) | BIT(14));

2895 2896 2897
	ifmgd->broken_ap = false;

	if (aid == 0 || aid > IEEE80211_MAX_AID) {
J
Johannes Berg 已提交
2898 2899
		sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
			   aid);
2900 2901 2902 2903
		aid = 0;
		ifmgd->broken_ap = true;
	}

J
Johannes Berg 已提交
2904
	pos = mgmt->u.assoc_resp.variable;
2905
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2906

2907
	if (!elems.supp_rates) {
J
Johannes Berg 已提交
2908
		sdata_info(sdata, "no SuppRates element in AssocResp\n");
J
Johannes Berg 已提交
2909
		return false;
2910 2911
	}

2912
	ifmgd->aid = aid;
2913 2914 2915
	ifmgd->tdls_chan_switch_prohibited =
		elems.ext_capab && elems.ext_capab_len >= 5 &&
		(elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
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 2973 2974 2975 2976 2977 2978 2979
	/*
	 * 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");
		}
	}

2980 2981 2982 2983 2984 2985 2986
	/*
	 * 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,
2987 2988 2989
			   "HT AP is missing WMM params or HT capability/operation\n");
		ret = false;
		goto out;
2990 2991 2992 2993 2994
	}

	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    (!elems.vht_cap_elem || !elems.vht_operation)) {
		sdata_info(sdata,
2995 2996 2997
			   "VHT AP is missing VHT capability/operation\n");
		ret = false;
		goto out;
2998 2999
	}

3000 3001 3002 3003 3004
	mutex_lock(&sdata->local->sta_mtx);
	/*
	 * station info was already allocated and inserted before
	 * the association and should be available to us
	 */
3005
	sta = sta_info_get(sdata, cbss->bssid);
3006 3007
	if (WARN_ON(!sta)) {
		mutex_unlock(&sdata->local->sta_mtx);
3008 3009
		ret = false;
		goto out;
3010
	}
3011

3012 3013 3014 3015 3016 3017
	sband = ieee80211_get_sband(sdata);
	if (!sband) {
		mutex_unlock(&sdata->local->sta_mtx);
		ret = false;
		goto out;
	}
3018

3019
	/* Set up internal HT/VHT capabilities */
3020
	if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
B
Ben Greear 已提交
3021
		ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3022
						  elems.ht_cap_elem, sta);
3023

M
Mahesh Palivela 已提交
3024 3025
	if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
		ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3026
						    elems.vht_cap_elem, sta);
M
Mahesh Palivela 已提交
3027

3028 3029 3030 3031 3032 3033
	/*
	 * 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.
	 */
3034

3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049
	/*
	 * 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;
	}

3050
	rate_control_rate_init(sta);
3051

3052
	if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
J
Johannes Berg 已提交
3053
		set_sta_flag(sta, WLAN_STA_MFP);
3054 3055 3056 3057
		sta->sta.mfp = true;
	} else {
		sta->sta.mfp = false;
	}
3058

3059
	sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3060

3061
	err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3062 3063 3064
	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
3065 3066 3067
		sdata_info(sdata,
			   "failed to move station %pM to desired state\n",
			   sta->sta.addr);
3068 3069
		WARN_ON(__sta_info_destroy(sta));
		mutex_unlock(&sdata->local->sta_mtx);
3070 3071
		ret = false;
		goto out;
3072 3073
	}

3074
	mutex_unlock(&sdata->local->sta_mtx);
3075

3076 3077 3078 3079 3080 3081 3082 3083
	/*
	 * 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;

3084
	if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3085
		ieee80211_set_wmm_default(sdata, false, false);
3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098
	} 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;
	}
3099
	changed |= BSS_CHANGED_QOS;
3100

3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112
	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
3113 3114 3115 3116
	/* set AID and assoc capability,
	 * ieee80211_set_associated() will tell the driver */
	bss_conf->aid = aid;
	bss_conf->assoc_capability = capab_info;
3117
	ieee80211_set_associated(sdata, cbss, changed);
3118

3119 3120 3121 3122 3123 3124 3125
	/*
	 * 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);

3126
	/*
J
Johannes Berg 已提交
3127 3128
	 * Start timer to probe the connection to the AP now.
	 * Also start the timer that will detect beacon loss.
3129
	 */
J
Johannes Berg 已提交
3130
	ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3131
	ieee80211_sta_reset_beacon_monitor(sdata);
3132

3133 3134 3135 3136
	ret = true;
 out:
	kfree(bss_ies);
	return ret;
3137 3138
}

3139 3140 3141
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
3142 3143 3144 3145 3146
{
	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;
3147
	int ac, uapsd_queues = -1;
J
Johannes Berg 已提交
3148 3149
	u8 *pos;
	bool reassoc;
3150
	struct cfg80211_bss *bss;
3151 3152 3153 3154
	struct ieee80211_event event = {
		.type = MLME_EVENT,
		.u.mlme.data = ASSOC_EVENT,
	};
J
Johannes Berg 已提交
3155

3156
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3157 3158

	if (!assoc_data)
3159
		return;
3160
	if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3161
		return;
J
Johannes Berg 已提交
3162 3163 3164 3165 3166 3167 3168

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

	if (len < 24 + 6)
3169
		return;
J
Johannes Berg 已提交
3170 3171 3172 3173 3174 3175

	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
3176 3177 3178 3179
	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
3180

3181 3182 3183 3184
	if (assoc_data->fils_kek_len &&
	    fils_decrypt_assoc_resp(sdata, (u8 *)mgmt, &len, assoc_data) < 0)
		return;

J
Johannes Berg 已提交
3185
	pos = mgmt->u.assoc_resp.variable;
3186
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
3187 3188

	if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3189 3190
	    elems.timeout_int &&
	    elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
J
Johannes Berg 已提交
3191
		u32 tu, ms;
3192
		tu = le32_to_cpu(elems.timeout_int->value);
J
Johannes Berg 已提交
3193
		ms = tu * 1024 / 1000;
J
Johannes Berg 已提交
3194 3195 3196
		sdata_info(sdata,
			   "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
			   mgmt->sa, tu, ms);
J
Johannes Berg 已提交
3197
		assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3198
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
3199
		if (ms > IEEE80211_ASSOC_TIMEOUT)
3200 3201
			run_again(sdata, assoc_data->timeout);
		return;
J
Johannes Berg 已提交
3202 3203
	}

3204
	bss = assoc_data->bss;
J
Johannes Berg 已提交
3205 3206

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
3207 3208
		sdata_info(sdata, "%pM denied association (code=%d)\n",
			   mgmt->sa, status_code);
3209
		ieee80211_destroy_assoc_data(sdata, false, false);
3210 3211 3212
		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
3213
	} else {
3214
		if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
J
Johannes Berg 已提交
3215
			/* oops -- internal error -- send timeout for now */
3216
			ieee80211_destroy_assoc_data(sdata, false, false);
3217
			cfg80211_assoc_timeout(sdata->dev, bss);
3218
			return;
J
Johannes Berg 已提交
3219
		}
3220 3221
		event.u.mlme.status = MLME_SUCCESS;
		drv_event_callback(sdata->local, sdata, &event);
3222
		sdata_info(sdata, "associated\n");
3223 3224 3225 3226 3227 3228

		/*
		 * 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
		 */
3229
		ieee80211_destroy_assoc_data(sdata, true, false);
3230 3231 3232 3233 3234

		/* get uapsd queues configuration */
		uapsd_queues = 0;
		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
			if (sdata->tx_conf[ac].uapsd)
3235
				uapsd_queues |= ieee80211_ac_to_qos_mask[ac];
J
Johannes Berg 已提交
3236 3237
	}

3238
	cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
J
Johannes Berg 已提交
3239
}
J
Johannes Berg 已提交
3240

3241
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
3242
				  struct ieee80211_mgmt *mgmt, size_t len,
3243
				  struct ieee80211_rx_status *rx_status,
3244
				  struct ieee802_11_elems *elems)
3245 3246
{
	struct ieee80211_local *local = sdata->local;
3247
	struct ieee80211_bss *bss;
3248
	struct ieee80211_channel *channel;
3249

3250
	sdata_assert_lock(sdata);
3251

3252 3253
	channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
	if (!channel)
3254 3255 3256
		return;

	bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3257
					channel);
3258 3259
	if (bss) {
		sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3260
		ieee80211_rx_bss_put(local, bss);
3261
	}
3262 3263 3264
}


3265
static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
3266
					 struct sk_buff *skb)
3267
{
J
Johannes Berg 已提交
3268
	struct ieee80211_mgmt *mgmt = (void *)skb->data;
3269
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
3270 3271
	struct ieee80211_rx_status *rx_status = (void *) skb->cb;
	size_t baselen, len = skb->len;
3272 3273
	struct ieee802_11_elems elems;

3274 3275
	ifmgd = &sdata->u.mgd;

3276
	sdata_assert_lock(sdata);
3277

3278
	if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3279 3280
		return; /* ignore ProbeResp to foreign address */

3281 3282 3283 3284 3285
	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
	if (baselen > len)
		return;

	ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3286
			       false, &elems);
3287

3288
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3289

3290
	if (ifmgd->associated &&
3291
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3292
		ieee80211_reset_ap_probe(sdata);
3293 3294
}

3295 3296 3297
/*
 * This is the canonical list of information elements we care about,
 * the filter code also gives us all changes to the Microsoft OUI
3298 3299 3300
 * (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.
3301 3302 3303 3304 3305 3306 3307 3308 3309 3310
 *
 * 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 =
3311 3312 3313 3314 3315
	(1ULL << WLAN_EID_COUNTRY) |
	(1ULL << WLAN_EID_ERP_INFO) |
	(1ULL << WLAN_EID_CHANNEL_SWITCH) |
	(1ULL << WLAN_EID_PWR_CONSTRAINT) |
	(1ULL << WLAN_EID_HT_CAPABILITY) |
3316 3317
	(1ULL << WLAN_EID_HT_OPERATION) |
	(1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3318

3319 3320 3321
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)
3322
{
3323
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3324
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3325 3326
	size_t baselen;
	struct ieee802_11_elems elems;
3327
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
3328 3329
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
3330
	struct sta_info *sta;
3331
	u32 changed = 0;
3332
	bool erp_valid;
J
Johannes Berg 已提交
3333
	u8 erp_value = 0;
3334
	u32 ncrc;
3335
	u8 *bssid;
3336
	u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3337

3338
	sdata_assert_lock(sdata);
3339

3340 3341 3342
	/* Process beacon from the current BSS */
	baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
	if (baselen > len)
3343
		return;
3344

J
Johannes Berg 已提交
3345 3346 3347 3348
	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		rcu_read_unlock();
3349
		return;
J
Johannes Berg 已提交
3350 3351
	}

3352
	if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
J
Johannes Berg 已提交
3353
		rcu_read_unlock();
3354
		return;
J
Johannes Berg 已提交
3355
	}
3356
	chan = chanctx_conf->def.chan;
J
Johannes Berg 已提交
3357
	rcu_read_unlock();
3358

3359
	if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3360
	    ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
J
Johannes Berg 已提交
3361
		ieee802_11_parse_elems(mgmt->u.beacon.variable,
3362
				       len - baselen, false, &elems);
3363

3364
		ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3365 3366 3367 3368
		if (elems.tim && !elems.parse_error) {
			const struct ieee80211_tim_ie *tim_ie = elems.tim;
			ifmgd->dtim_period = tim_ie->dtim_period;
		}
3369
		ifmgd->have_beacon = true;
3370
		ifmgd->assoc_data->need_beacon = false;
3371
		if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3372 3373 3374 3375 3376 3377 3378 3379 3380 3381
			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
3382 3383
		/* continue assoc process */
		ifmgd->assoc_data->timeout = jiffies;
3384
		ifmgd->assoc_data->timeout_started = true;
3385 3386
		run_again(sdata, ifmgd->assoc_data->timeout);
		return;
J
Johannes Berg 已提交
3387
	}
3388

J
Johannes Berg 已提交
3389
	if (!ifmgd->associated ||
3390
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3391
		return;
J
Johannes Berg 已提交
3392
	bssid = ifmgd->associated->bssid;
3393

3394 3395 3396
	/* 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;
3397
		ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3398
		ifmgd->last_cqm_event_signal = 0;
3399
		ifmgd->count_beacon_signal = 1;
3400
		ifmgd->last_ave_beacon_signal = 0;
3401
	} else {
3402
		ifmgd->count_beacon_signal++;
3403
	}
3404

3405 3406
	ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);

3407 3408
	if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3409
		int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3410
		int last_sig = ifmgd->last_ave_beacon_signal;
3411 3412 3413
		struct ieee80211_event event = {
			.type = RSSI_EVENT,
		};
3414 3415 3416 3417 3418 3419 3420 3421

		/*
		 * 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;
3422 3423
			event.u.rssi.data = RSSI_EVENT_HIGH;
			drv_event_callback(local, sdata, &event);
3424 3425 3426 3427
		} else if (sig < ifmgd->rssi_min_thold &&
			   (last_sig >= ifmgd->rssi_max_thold ||
			   last_sig == 0)) {
			ifmgd->last_ave_beacon_signal = sig;
3428 3429
			event.u.rssi.data = RSSI_EVENT_LOW;
			drv_event_callback(local, sdata, &event);
3430 3431 3432
		}
	}

3433
	if (bss_conf->cqm_rssi_thold &&
3434
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3435
	    !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3436
		int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3437 3438 3439
		int last_event = ifmgd->last_cqm_event_signal;
		int thold = bss_conf->cqm_rssi_thold;
		int hyst = bss_conf->cqm_rssi_hyst;
3440

3441 3442 3443 3444 3445 3446
		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,
3447
				sig, GFP_KERNEL);
3448 3449 3450 3451 3452 3453
		} 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,
3454
				sig, GFP_KERNEL);
3455 3456 3457
		}
	}

3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481
	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);
		}
	}

3482
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
J
Johannes Berg 已提交
3483
		mlme_dbg_ratelimited(sdata,
3484
				     "cancelling AP probe due to a received beacon\n");
3485
		ieee80211_reset_ap_probe(sdata);
3486 3487
	}

J
Johannes Berg 已提交
3488 3489 3490 3491
	/*
	 * Push the beacon loss detection into the future since
	 * we are processing a beacon from the AP just now.
	 */
3492
	ieee80211_sta_reset_beacon_monitor(sdata);
J
Johannes Berg 已提交
3493

3494 3495
	ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
	ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3496
					  len - baselen, false, &elems,
3497 3498
					  care_about_ies, ncrc);

3499 3500 3501 3502 3503 3504 3505
	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);
3506
			}
3507
			ieee80211_send_nullfunc(local, sdata, false);
3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519
		} 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);
3520 3521
		}
	}
J
Johannes Berg 已提交
3522

3523 3524
	if (sdata->vif.p2p ||
	    sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
J
Janusz Dziedzic 已提交
3525
		struct ieee80211_p2p_noa_attr noa = {};
3526 3527 3528 3529 3530
		int ret;

		ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
					    len - baselen,
					    IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3531
					    (u8 *) &noa, sizeof(noa));
J
Janusz Dziedzic 已提交
3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547
		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));
3548 3549 3550 3551 3552
			changed |= BSS_CHANGED_P2P_PS;
			ifmgd->beacon_crc_valid = false;
		}
	}

3553 3554 3555
	if (ifmgd->csa_waiting_bcn)
		ieee80211_chswitch_post_beacon(sdata);

3556 3557 3558 3559 3560 3561 3562 3563
	/*
	 * 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.
	 */
3564
	if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575
		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;
	}

3576
	if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3577
		return;
3578
	ifmgd->beacon_crc = ncrc;
3579
	ifmgd->beacon_crc_valid = true;
3580

3581
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3582

3583
	ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3584
					 rx_status->device_timestamp,
3585 3586
					 &elems, true);

3587 3588
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
	    ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3589 3590 3591
				     elems.wmm_param_len))
		changed |= BSS_CHANGED_QOS;

3592 3593
	/*
	 * If we haven't had a beacon before, tell the driver about the
3594
	 * DTIM period (and beacon timing if desired) now.
3595
	 */
3596
	if (!ifmgd->have_beacon) {
3597 3598 3599 3600 3601
		/* 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;
3602

3603 3604
		changed |= BSS_CHANGED_BEACON_INFO;
		ifmgd->have_beacon = true;
3605 3606

		mutex_lock(&local->iflist_mtx);
J
Johannes Berg 已提交
3607
		ieee80211_recalc_ps(local);
3608 3609
		mutex_unlock(&local->iflist_mtx);

3610
		ieee80211_recalc_ps_vif(sdata);
3611 3612
	}

3613
	if (elems.erp_info) {
J
Johannes Berg 已提交
3614 3615 3616 3617
		erp_valid = true;
		erp_value = elems.erp_info[0];
	} else {
		erp_valid = false;
3618
	}
J
Johannes Berg 已提交
3619 3620 3621
	changed |= ieee80211_handle_bss_capability(sdata,
			le16_to_cpu(mgmt->u.beacon.capab_info),
			erp_valid, erp_value);
3622

3623
	mutex_lock(&local->sta_mtx);
3624 3625
	sta = sta_info_get(sdata, bssid);

3626 3627
	if (ieee80211_config_bw(sdata, sta,
				elems.ht_cap_elem, elems.ht_operation,
3628 3629
				elems.vht_operation, bssid, &changed)) {
		mutex_unlock(&local->sta_mtx);
3630 3631 3632
		sdata_info(sdata,
			   "failed to follow AP %pM bandwidth change, disconnect\n",
			   bssid);
3633 3634 3635
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_DEAUTH_LEAVING,
				       true, deauth_buf);
3636 3637 3638
		ieee80211_report_disconnect(sdata, deauth_buf,
					    sizeof(deauth_buf), true,
					    WLAN_REASON_DEAUTH_LEAVING);
3639
		return;
3640
	}
3641 3642 3643

	if (sta && elems.opmode_notif)
		ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3644
					    rx_status->band);
3645
	mutex_unlock(&local->sta_mtx);
3646

3647 3648 3649
	changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
					       elems.country_elem,
					       elems.country_elem_len,
3650 3651
					       elems.pwr_constr_elem,
					       elems.cisco_dtpc_elem);
3652

3653
	ieee80211_bss_info_change_notify(sdata, changed);
3654 3655
}

3656 3657
void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
				  struct sk_buff *skb)
3658 3659 3660 3661
{
	struct ieee80211_rx_status *rx_status;
	struct ieee80211_mgmt *mgmt;
	u16 fc;
3662 3663
	struct ieee802_11_elems elems;
	int ies_len;
3664 3665 3666 3667 3668

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

3669
	sdata_lock(sdata);
3670

J
Johannes Berg 已提交
3671 3672
	switch (fc & IEEE80211_FCTL_STYPE) {
	case IEEE80211_STYPE_BEACON:
3673
		ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
J
Johannes Berg 已提交
3674 3675 3676 3677 3678
		break;
	case IEEE80211_STYPE_PROBE_RESP:
		ieee80211_rx_mgmt_probe_resp(sdata, skb);
		break;
	case IEEE80211_STYPE_AUTH:
3679
		ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3680 3681
		break;
	case IEEE80211_STYPE_DEAUTH:
3682
		ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3683 3684
		break;
	case IEEE80211_STYPE_DISASSOC:
3685
		ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3686 3687 3688
		break;
	case IEEE80211_STYPE_ASSOC_RESP:
	case IEEE80211_STYPE_REASSOC_RESP:
3689
		ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3690 3691
		break;
	case IEEE80211_STYPE_ACTION:
3692
		if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3693 3694 3695
			ies_len = skb->len -
				  offsetof(struct ieee80211_mgmt,
					   u.action.u.chan_switch.variable);
3696 3697 3698 3699 3700 3701

			if (ies_len < 0)
				break;

			ieee802_11_parse_elems(
				mgmt->u.action.u.chan_switch.variable,
3702
				ies_len, true, &elems);
3703 3704 3705 3706

			if (elems.parse_error)
				break;

3707
			ieee80211_sta_process_chanswitch(sdata,
3708 3709 3710
						 rx_status->mactime,
						 rx_status->device_timestamp,
						 &elems, false);
3711 3712 3713 3714 3715 3716 3717 3718 3719 3720
		} 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,
3721
				ies_len, true, &elems);
3722 3723 3724 3725 3726 3727 3728 3729

			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
3730
			ieee80211_sta_process_chanswitch(sdata,
3731 3732 3733
						 rx_status->mactime,
						 rx_status->device_timestamp,
						 &elems, false);
3734
		}
3735
		break;
3736
	}
3737
	sdata_unlock(sdata);
3738 3739
}

J
Johannes Berg 已提交
3740
static void ieee80211_sta_timer(unsigned long data)
3741
{
J
Johannes Berg 已提交
3742 3743
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
3744

3745
	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3746 3747
}

3748
static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3749
					  u8 *bssid, u8 reason, bool tx)
3750
{
3751
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3752

3753
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3754
			       tx, frame_buf);
3755

3756 3757
	ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
				    reason);
3758 3759
}

3760
static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
3761 3762 3763 3764
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3765
	u32 tx_flags = 0;
3766 3767
	u16 trans = 1;
	u16 status = 0;
J
Johannes Berg 已提交
3768

3769
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3770 3771 3772 3773 3774 3775 3776

	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
3777 3778
		sdata_info(sdata, "authentication with %pM timed out\n",
			   auth_data->bss->bssid);
J
Johannes Berg 已提交
3779 3780 3781 3782 3783 3784 3785 3786 3787 3788

		/*
		 * 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
3789 3790
	drv_mgd_prepare_tx(local, sdata);

3791 3792 3793
	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
3794

3795
	auth_data->expected_transaction = 2;
3796

3797 3798 3799 3800 3801
	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
3802

3803 3804 3805
	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
3806

3807 3808 3809 3810 3811
	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
3812

3813
	if (tx_flags == 0) {
3814
		auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3815
		auth_data->timeout_started = true;
3816
		run_again(sdata, auth_data->timeout);
3817
	} else {
3818 3819 3820 3821
		auth_data->timeout =
			round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
		auth_data->timeout_started = true;
		run_again(sdata, auth_data->timeout);
3822
	}
J
Johannes Berg 已提交
3823 3824 3825 3826 3827 3828 3829 3830 3831

	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;

3832
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3833 3834 3835

	assoc_data->tries++;
	if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
J
Johannes Berg 已提交
3836 3837
		sdata_info(sdata, "association with %pM timed out\n",
			   assoc_data->bss->bssid);
J
Johannes Berg 已提交
3838 3839 3840 3841 3842 3843 3844 3845 3846 3847

		/*
		 * 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
3848 3849 3850
	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
3851 3852
	ieee80211_send_assoc(sdata);

3853
	if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3854
		assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3855
		assoc_data->timeout_started = true;
3856
		run_again(sdata, assoc_data->timeout);
3857
	} else {
3858 3859 3860 3861 3862
		assoc_data->timeout =
			round_jiffies_up(jiffies +
					 IEEE80211_ASSOC_TIMEOUT_LONG);
		assoc_data->timeout_started = true;
		run_again(sdata, assoc_data->timeout);
3863
	}
J
Johannes Berg 已提交
3864 3865 3866 3867

	return 0;
}

3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879
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);
}

3880
void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
3881 3882
{
	struct ieee80211_local *local = sdata->local;
3883
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3884

3885
	sdata_lock(sdata);
3886

3887 3888 3889 3890 3891
	if (ifmgd->status_received) {
		__le16 fc = ifmgd->status_fc;
		bool status_acked = ifmgd->status_acked;

		ifmgd->status_received = false;
3892
		if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3893 3894 3895
			if (status_acked) {
				ifmgd->auth_data->timeout =
					jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3896
				run_again(sdata, ifmgd->auth_data->timeout);
3897 3898 3899
			} else {
				ifmgd->auth_data->timeout = jiffies - 1;
			}
3900
			ifmgd->auth_data->timeout_started = true;
3901 3902 3903 3904 3905 3906
		} 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;
3907
				run_again(sdata, ifmgd->assoc_data->timeout);
3908 3909 3910
			} else {
				ifmgd->assoc_data->timeout = jiffies - 1;
			}
3911
			ifmgd->assoc_data->timeout_started = true;
3912 3913 3914
		}
	}

3915
	if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
J
Johannes Berg 已提交
3916 3917 3918 3919 3920 3921 3922
	    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);
3923
		} else if (ieee80211_auth(sdata)) {
J
Johannes Berg 已提交
3924
			u8 bssid[ETH_ALEN];
3925 3926 3927 3928 3929
			struct ieee80211_event event = {
				.type = MLME_EVENT,
				.u.mlme.data = AUTH_EVENT,
				.u.mlme.status = MLME_TIMEOUT,
			};
J
Johannes Berg 已提交
3930 3931 3932 3933 3934

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

			ieee80211_destroy_auth_data(sdata, false);

3935
			cfg80211_auth_timeout(sdata->dev, bssid);
3936
			drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
3937
		}
3938
	} else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3939
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
3940

3941
	if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
J
Johannes Berg 已提交
3942
	    time_after(jiffies, ifmgd->assoc_data->timeout)) {
3943
		if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
J
Johannes Berg 已提交
3944
		    ieee80211_do_assoc(sdata)) {
3945
			struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3946 3947 3948 3949 3950
			struct ieee80211_event event = {
				.type = MLME_EVENT,
				.u.mlme.data = ASSOC_EVENT,
				.u.mlme.status = MLME_TIMEOUT,
			};
J
Johannes Berg 已提交
3951

3952
			ieee80211_destroy_assoc_data(sdata, false, false);
3953
			cfg80211_assoc_timeout(sdata->dev, bss);
3954
			drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
3955
		}
3956
	} else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3957
		run_again(sdata, ifmgd->assoc_data->timeout);
J
Johannes Berg 已提交
3958

3959
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
J
Johannes Berg 已提交
3960
	    ifmgd->associated) {
3961
		u8 bssid[ETH_ALEN];
3962
		int max_tries;
3963

3964
		memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3965

3966
		if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3967
			max_tries = max_nullfunc_tries;
3968
		else
3969
			max_tries = max_probe_tries;
3970

3971 3972 3973
		/* ACK received for nullfunc probing frame */
		if (!ifmgd->probe_send_count)
			ieee80211_reset_ap_probe(sdata);
3974 3975
		else if (ifmgd->nullfunc_failed) {
			if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3976 3977 3978 3979
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
					 bssid, ifmgd->probe_send_count,
					 max_tries);
3980 3981
				ieee80211_mgd_probe_ap_send(sdata);
			} else {
J
Johannes Berg 已提交
3982 3983 3984
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
					 bssid);
3985
				ieee80211_sta_connection_lost(sdata, bssid,
3986 3987
					WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
					false);
3988 3989
			}
		} else if (time_is_after_jiffies(ifmgd->probe_timeout))
3990
			run_again(sdata, ifmgd->probe_timeout);
3991
		else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
J
Johannes Berg 已提交
3992 3993 3994
			mlme_dbg(sdata,
				 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
				 bssid, probe_wait_ms);
3995
			ieee80211_sta_connection_lost(sdata, bssid,
3996
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3997
		} else if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3998 3999 4000 4001
			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);
4002 4003
			ieee80211_mgd_probe_ap_send(sdata);
		} else {
J
Johannes Berg 已提交
4004 4005 4006 4007
			/*
			 * We actually lost the connection ... or did we?
			 * Let's make sure!
			 */
4008 4009 4010
			mlme_dbg(sdata,
				 "No probe response from AP %pM after %dms, disconnecting.\n",
				 bssid, probe_wait_ms);
4011

4012
			ieee80211_sta_connection_lost(sdata, bssid,
4013
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
J
Johannes Berg 已提交
4014 4015 4016
		}
	}

4017
	sdata_unlock(sdata);
4018 4019
}

J
Johannes Berg 已提交
4020 4021 4022 4023
static void ieee80211_sta_bcn_mon_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
4024
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
4025

4026
	if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
M
Michal Kazior 已提交
4027 4028
		return;

4029
	sdata->u.mgd.connection_loss = false;
4030 4031
	ieee80211_queue_work(&sdata->local->hw,
			     &sdata->u.mgd.beacon_connection_loss_work);
J
Johannes Berg 已提交
4032 4033 4034 4035 4036 4037 4038 4039 4040
}

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;

4041
	if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
M
Michal Kazior 已提交
4042 4043
		return;

4044
	ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
J
Johannes Berg 已提交
4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055
}

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
4056 4057
static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
4058
	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4059
		__ieee80211_stop_poll(sdata);
4060

J
Johannes Berg 已提交
4061
		/* let's probe the connection once */
4062
		if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4063 4064
			ieee80211_queue_work(&sdata->local->hw,
					     &sdata->u.mgd.monitor_work);
4065
	}
J
Johannes Berg 已提交
4066
}
4067

4068
#ifdef CONFIG_PM
4069 4070 4071 4072 4073 4074 4075
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);

4076 4077 4078 4079 4080
	if (ifmgd->auth_data || ifmgd->assoc_data) {
		const u8 *bssid = ifmgd->auth_data ?
				ifmgd->auth_data->bss->bssid :
				ifmgd->assoc_data->bss->bssid;

4081
		/*
4082 4083 4084
		 * 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.
4085
		 */
4086
		ieee80211_send_deauth_disassoc(sdata, bssid,
4087 4088 4089
					       IEEE80211_STYPE_DEAUTH,
					       WLAN_REASON_DEAUTH_LEAVING,
					       false, frame_buf);
4090
		if (ifmgd->assoc_data)
4091
			ieee80211_destroy_assoc_data(sdata, false, true);
4092 4093
		if (ifmgd->auth_data)
			ieee80211_destroy_auth_data(sdata, false);
4094 4095 4096 4097
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
	}

4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125
	/* 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);
	}

4126 4127 4128
	sdata_unlock(sdata);
}

4129 4130 4131 4132
void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

4133
	sdata_lock(sdata);
4134
	if (!ifmgd->associated) {
4135
		sdata_unlock(sdata);
4136 4137 4138 4139 4140 4141 4142 4143 4144 4145
		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);
4146
		sdata_unlock(sdata);
4147 4148
		return;
	}
4149
	sdata_unlock(sdata);
4150 4151 4152
}
#endif

J
Johannes Berg 已提交
4153 4154
/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4155
{
4156
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
4157

4158
	ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
4159
	INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4160
	INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4161 4162
	INIT_WORK(&ifmgd->beacon_connection_loss_work,
		  ieee80211_beacon_connection_loss_work);
4163 4164
	INIT_WORK(&ifmgd->csa_connection_drop_work,
		  ieee80211_csa_connection_drop_work);
4165
	INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4166 4167
	INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
			  ieee80211_tdls_peer_del_work);
4168
	setup_timer(&ifmgd->timer, ieee80211_sta_timer,
S
Sujith 已提交
4169
		    (unsigned long) sdata);
J
Johannes Berg 已提交
4170 4171 4172 4173
	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);
4174
	setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
J
Johannes Berg 已提交
4175
		    (unsigned long) sdata);
4176 4177
	INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
			  ieee80211_sta_handle_tspec_ac_params_wk);
J
Johannes Berg 已提交
4178

4179
	ifmgd->flags = 0;
4180
	ifmgd->powersave = sdata->wdev.ps;
4181 4182
	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
4183
	ifmgd->p2p_noa_index = -1;
J
Johannes Berg 已提交
4184

4185
	if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4186 4187 4188
		ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
	else
		ifmgd->req_smps = IEEE80211_SMPS_OFF;
4189 4190 4191 4192 4193

	/* Setup TDLS data */
	spin_lock_init(&ifmgd->teardown_lock);
	ifmgd->teardown_skb = NULL;
	ifmgd->orig_teardown_skb = NULL;
4194 4195
}

4196 4197
/* scan finished notification */
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
J
Johannes Berg 已提交
4198
{
4199
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
4200

4201 4202
	/* Restart STA timers */
	rcu_read_lock();
4203 4204 4205 4206
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (ieee80211_sdata_running(sdata))
			ieee80211_restart_sta_timer(sdata);
	}
4207 4208
	rcu_read_unlock();
}
J
Johannes Berg 已提交
4209

J
Johannes Berg 已提交
4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221
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;

4222
	ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
J
Johannes Berg 已提交
4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234
	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;

4235
	vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
J
Johannes Berg 已提交
4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253
	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;
}

4254 4255
static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
				  struct cfg80211_bss *cbss)
4256 4257 4258
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4259
	const struct ieee80211_ht_cap *ht_cap = NULL;
4260
	const struct ieee80211_ht_operation *ht_oper = NULL;
J
Johannes Berg 已提交
4261
	const struct ieee80211_vht_operation *vht_oper = NULL;
4262
	struct ieee80211_supported_band *sband;
4263
	struct cfg80211_chan_def chandef;
J
Johannes Berg 已提交
4264
	int ret;
4265 4266
	u32 i;
	bool have_80mhz;
4267

4268 4269
	sband = local->hw.wiphy->bands[cbss->channel->band];

J
Johannes Berg 已提交
4270 4271 4272 4273
	ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
			  IEEE80211_STA_DISABLE_80P80MHZ |
			  IEEE80211_STA_DISABLE_160MHZ);

4274 4275
	rcu_read_lock();

J
Johannes Berg 已提交
4276 4277
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	    sband->ht_cap.ht_supported) {
4278
		const u8 *ht_oper_ie, *ht_cap_ie;
4279

4280
		ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4281 4282
		if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
			ht_oper = (void *)(ht_oper_ie + 2);
4283

4284 4285 4286 4287 4288
		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) {
4289 4290 4291
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ht_oper = NULL;
		}
4292 4293
	}

J
Johannes Berg 已提交
4294 4295
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    sband->vht_cap.vht_supported) {
4296
		const u8 *vht_oper_ie, *vht_cap;
J
Johannes Berg 已提交
4297

4298 4299
		vht_oper_ie = ieee80211_bss_get_ie(cbss,
						   WLAN_EID_VHT_OPERATION);
J
Johannes Berg 已提交
4300 4301 4302 4303
		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
4304
			sdata_info(sdata,
J
Johannes Berg 已提交
4305
				   "AP advertised VHT without HT, disabling both\n");
4306 4307
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4308
		}
4309 4310 4311 4312 4313 4314

		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;
		}
4315 4316
	}

4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330
	/* 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
4331 4332
	ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
						     cbss->channel,
4333
						     ht_cap, ht_oper, vht_oper,
4334
						     &chandef, false);
4335

J
Johannes Berg 已提交
4336 4337
	sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
				      local->rx_chains);
4338

4339 4340
	rcu_read_unlock();

4341 4342 4343
	/* will change later if needed */
	sdata->smps_mode = IEEE80211_SMPS_OFF;

4344
	mutex_lock(&local->mtx);
J
Johannes Berg 已提交
4345 4346 4347 4348 4349 4350 4351
	/*
	 * 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);
4352 4353 4354 4355

	/* don't downgrade for 5 and 10 MHz channels, though. */
	if (chandef.width == NL80211_CHAN_WIDTH_5 ||
	    chandef.width == NL80211_CHAN_WIDTH_10)
4356
		goto out;
4357

4358
	while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4359
		ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4360 4361 4362
		ret = ieee80211_vif_use_channel(sdata, &chandef,
						IEEE80211_CHANCTX_SHARED);
	}
4363 4364
 out:
	mutex_unlock(&local->mtx);
J
Johannes Berg 已提交
4365
	return ret;
4366 4367 4368
}

static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4369 4370
				     struct cfg80211_bss *cbss, bool assoc,
				     bool override)
4371 4372 4373 4374 4375
{
	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;
4376
	struct ieee80211_supported_band *sband;
4377
	bool have_sta = false;
4378 4379
	int err;

4380 4381
	sband = local->hw.wiphy->bands[cbss->channel->band];

4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395
	if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
		return -EINVAL;

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

	if (!have_sta) {
		new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
		if (!new_sta)
			return -ENOMEM;
	}
4396

4397
	if (new_sta || override) {
4398 4399 4400 4401 4402 4403 4404 4405
		err = ieee80211_prep_channel(sdata, cbss);
		if (err) {
			if (new_sta)
				sta_info_free(local, new_sta);
			return -EINVAL;
		}
	}

J
Johannes Berg 已提交
4406
	if (new_sta) {
4407 4408 4409
		u32 rates = 0, basic_rates = 0;
		bool have_higher_than_11mbit;
		int min_rate = INT_MAX, min_rate_index = -1;
4410
		struct ieee80211_chanctx_conf *chanctx_conf;
J
Johannes Berg 已提交
4411
		const struct cfg80211_bss_ies *ies;
4412
		int shift = ieee80211_vif_get_shift(&sdata->vif);
4413
		u32 rate_flags;
4414

4415 4416 4417 4418
		rcu_read_lock();
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (WARN_ON(!chanctx_conf)) {
			rcu_read_unlock();
E
Eytan Lifshitz 已提交
4419
			sta_info_free(local, new_sta);
4420 4421 4422 4423
			return -EINVAL;
		}
		rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
		rcu_read_unlock();
4424 4425 4426 4427 4428

		ieee80211_get_rates(sband, bss->supp_rates,
				    bss->supp_rates_len,
				    &rates, &basic_rates,
				    &have_higher_than_11mbit,
4429 4430
				    &min_rate, &min_rate_index,
				    shift, rate_flags);
4431 4432 4433 4434 4435 4436 4437 4438 4439 4440

		/*
		 * 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
4441 4442
			sdata_info(sdata,
				   "No basic rates, using min rate instead\n");
4443 4444 4445
			basic_rates = BIT(min_rate_index);
		}

J
Johannes Berg 已提交
4446
		new_sta->sta.supp_rates[cbss->channel->band] = rates;
4447 4448 4449
		sdata->vif.bss_conf.basic_rates = basic_rates;

		/* cf. IEEE 802.11 9.2.12 */
4450
		if (cbss->channel->band == NL80211_BAND_2GHZ &&
4451 4452 4453 4454 4455 4456 4457
		    have_higher_than_11mbit)
			sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
		else
			sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

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

4458 4459
		/* set timing information */
		sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
J
Johannes Berg 已提交
4460
		rcu_read_lock();
4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473
		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;
4474 4475
		} else if (!ieee80211_hw_check(&sdata->local->hw,
					       TIMING_BEACON_ONLY)) {
4476 4477 4478 4479 4480 4481 4482 4483 4484 4485 4486
			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
4487
		rcu_read_unlock();
4488 4489

		/* tell driver about BSSID, basic rates and timing */
4490
		ieee80211_bss_info_change_notify(sdata,
4491 4492
			BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
			BSS_CHANGED_BEACON_INT);
4493 4494

		if (assoc)
J
Johannes Berg 已提交
4495
			sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4496

J
Johannes Berg 已提交
4497 4498
		err = sta_info_insert(new_sta);
		new_sta = NULL;
4499
		if (err) {
J
Johannes Berg 已提交
4500 4501 4502
			sdata_info(sdata,
				   "failed to insert STA entry for the AP (error %d)\n",
				   err);
4503 4504 4505
			return err;
		}
	} else
4506
		WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4507

4508 4509 4510 4511
	/* Cancel scan to ensure that nothing interferes with connection */
	if (local->scanning)
		ieee80211_scan_cancel(local);

4512 4513 4514
	return 0;
}

4515 4516 4517
/* config hooks */
int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
		       struct cfg80211_auth_request *req)
J
Johannes Berg 已提交
4518
{
J
Johannes Berg 已提交
4519 4520 4521
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data;
4522
	u16 auth_alg;
J
Johannes Berg 已提交
4523 4524 4525
	int err;

	/* prepare auth data structure */
J
Johannes Berg 已提交
4526

4527 4528 4529 4530 4531
	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
4532
		if (IS_ERR(local->wep_tx_tfm))
4533
			return -EOPNOTSUPP;
4534 4535 4536 4537 4538 4539 4540 4541
		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;
4542 4543 4544
	case NL80211_AUTHTYPE_SAE:
		auth_alg = WLAN_AUTH_SAE;
		break;
4545 4546 4547 4548 4549 4550 4551 4552 4553
	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;
4554 4555
	default:
		return -EOPNOTSUPP;
J
Johannes Berg 已提交
4556
	}
4557

4558
	auth_data = kzalloc(sizeof(*auth_data) + req->auth_data_len +
4559
			    req->ie_len, GFP_KERNEL);
J
Johannes Berg 已提交
4560
	if (!auth_data)
J
Johannes Berg 已提交
4561
		return -ENOMEM;
4562

J
Johannes Berg 已提交
4563
	auth_data->bss = req->bss;
4564

4565
	if (req->auth_data_len >= 4) {
4566 4567 4568 4569 4570 4571
		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]);
		}
4572 4573 4574
		memcpy(auth_data->data, req->auth_data + 4,
		       req->auth_data_len - 4);
		auth_data->data_len += req->auth_data_len - 4;
4575 4576
	}

4577
	if (req->ie && req->ie_len) {
4578 4579 4580
		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
4581
	}
4582

J
Johannes Berg 已提交
4583
	if (req->key && req->key_len) {
J
Johannes Berg 已提交
4584 4585 4586
		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
4587 4588
	}

J
Johannes Berg 已提交
4589
	auth_data->algorithm = auth_alg;
J
Johannes Berg 已提交
4590

J
Johannes Berg 已提交
4591
	/* try to authenticate/probe */
4592

J
Johannes Berg 已提交
4593 4594 4595 4596
	if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
	    ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
4597 4598
	}

J
Johannes Berg 已提交
4599 4600
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
4601

J
Johannes Berg 已提交
4602 4603
	/* prep auth_data so we don't go into idle on disassoc */
	ifmgd->auth_data = auth_data;
J
Johannes Berg 已提交
4604

4605 4606 4607
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

4608 4609 4610
		sdata_info(sdata,
			   "disconnect from AP %pM for new auth to %pM\n",
			   ifmgd->associated->bssid, req->bss->bssid);
4611 4612 4613 4614
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_UNSPECIFIED,
				       false, frame_buf);

4615 4616 4617
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    WLAN_REASON_UNSPECIFIED);
4618
	}
J
Johannes Berg 已提交
4619

J
Johannes Berg 已提交
4620
	sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4621

4622
	err = ieee80211_prep_connection(sdata, req->bss, false, false);
4623
	if (err)
J
Johannes Berg 已提交
4624
		goto err_clear;
J
Johannes Berg 已提交
4625

4626
	err = ieee80211_auth(sdata);
J
Johannes Berg 已提交
4627 4628 4629 4630 4631 4632
	if (err) {
		sta_info_destroy_addr(sdata, req->bss->bssid);
		goto err_clear;
	}

	/* hold our own reference */
4633
	cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4634
	return 0;
J
Johannes Berg 已提交
4635 4636

 err_clear:
4637
	eth_zero_addr(ifmgd->bssid);
4638
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4639
	ifmgd->auth_data = NULL;
4640 4641 4642
	mutex_lock(&sdata->local->mtx);
	ieee80211_vif_release_channel(sdata);
	mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
4643 4644 4645
 err_free:
	kfree(auth_data);
	return err;
J
Johannes Berg 已提交
4646 4647
}

4648 4649
int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
			struct cfg80211_assoc_request *req)
4650
{
J
Johannes Berg 已提交
4651
	struct ieee80211_local *local = sdata->local;
4652
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4653
	struct ieee80211_bss *bss = (void *)req->bss->priv;
J
Johannes Berg 已提交
4654
	struct ieee80211_mgd_assoc_data *assoc_data;
4655
	const struct cfg80211_bss_ies *beacon_ies;
J
Johannes Berg 已提交
4656
	struct ieee80211_supported_band *sband;
4657
	const u8 *ssidie, *ht_ie, *vht_ie;
4658
	int i, err;
4659
	bool override = false;
4660

J
Johannes Berg 已提交
4661 4662 4663 4664
	assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
	if (!assoc_data)
		return -ENOMEM;

4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675
	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();

4676 4677 4678
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

4679 4680 4681
		sdata_info(sdata,
			   "disconnect from AP %pM for new assoc to %pM\n",
			   ifmgd->associated->bssid, req->bss->bssid);
4682 4683 4684 4685
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_UNSPECIFIED,
				       false, frame_buf);

4686 4687 4688
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    WLAN_REASON_UNSPECIFIED);
4689
	}
J
Johannes Berg 已提交
4690 4691 4692 4693

	if (ifmgd->auth_data && !ifmgd->auth_data->done) {
		err = -EBUSY;
		goto err_free;
J
Johannes Berg 已提交
4694
	}
4695

J
Johannes Berg 已提交
4696 4697 4698 4699
	if (ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
	}
4700

J
Johannes Berg 已提交
4701 4702 4703 4704
	if (ifmgd->auth_data) {
		bool match;

		/* keep sta info, bssid if matching */
4705
		match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
J
Johannes Berg 已提交
4706
		ieee80211_destroy_auth_data(sdata, match);
4707 4708
	}

J
Johannes Berg 已提交
4709
	/* prepare assoc data */
4710

4711 4712
	ifmgd->beacon_crc_valid = false;

4713 4714 4715
	assoc_data->wmm = bss->wmm_used &&
			  (local->hw.queues >= IEEE80211_NUM_ACS);

J
Johannes Berg 已提交
4716 4717 4718 4719 4720 4721 4722
	/*
	 * 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.
	 */
4723
	for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4724 4725
		if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4726
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4727
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4728
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4729
			netdev_info(sdata->dev,
4730
				    "disabling HT/VHT due to WEP/TKIP use\n");
4731 4732
		}
	}
4733

J
Johannes Berg 已提交
4734 4735 4736
	/* 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 ||
4737 4738
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4739
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4740 4741
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4742 4743
			netdev_info(sdata->dev,
				    "disabling HT as WMM/QoS is not supported by the AP\n");
4744
	}
J
Johannes Berg 已提交
4745

4746 4747
	/* disable VHT if we don't support it or the AP doesn't use WMM */
	if (!sband->vht_cap.vht_supported ||
4748 4749
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4750
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4751 4752
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4753 4754
			netdev_info(sdata->dev,
				    "disabling VHT as WMM/QoS is not supported by the AP\n");
4755 4756
	}

B
Ben Greear 已提交
4757 4758 4759 4760
	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));

4761 4762 4763 4764
	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));

4765
	if (req->ie && req->ie_len) {
J
Johannes Berg 已提交
4766 4767 4768
		memcpy(assoc_data->ie, req->ie, req->ie_len);
		assoc_data->ie_len = req->ie_len;
	}
4769

4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784
	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
4785
	assoc_data->bss = req->bss;
4786

J
Johannes Berg 已提交
4787 4788
	if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
		if (ifmgd->powersave)
4789
			sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
J
Johannes Berg 已提交
4790
		else
4791
			sdata->smps_mode = IEEE80211_SMPS_OFF;
J
Johannes Berg 已提交
4792
	} else
4793
		sdata->smps_mode = ifmgd->req_smps;
J
Johannes Berg 已提交
4794

J
Johannes Berg 已提交
4795 4796 4797
	assoc_data->capability = req->bss->capability;
	assoc_data->supp_rates = bss->supp_rates;
	assoc_data->supp_rates_len = bss->supp_rates_len;
4798

4799
	rcu_read_lock();
4800 4801 4802 4803 4804
	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
4805
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4806 4807 4808 4809 4810 4811
	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;
4812
	rcu_read_unlock();
4813

4814
	if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4815
		 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4816 4817 4818
	     "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
		sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;

K
Kalle Valo 已提交
4819
	if (bss->wmm_used && bss->uapsd_supported &&
4820
	    (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4821
		assoc_data->uapsd = true;
K
Kalle Valo 已提交
4822 4823
		ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
	} else {
4824
		assoc_data->uapsd = false;
K
Kalle Valo 已提交
4825 4826 4827
		ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
	}

4828
	if (req->prev_bssid)
J
Johannes Berg 已提交
4829
		memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4830 4831 4832 4833 4834 4835 4836 4837 4838

	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;
	}

4839 4840 4841 4842 4843
	if (req->flags & ASSOC_REQ_USE_RRM)
		ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
	else
		ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;

4844 4845 4846 4847 4848
	if (req->crypto.control_port)
		ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
	else
		ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;

4849 4850
	sdata->control_port_protocol = req->crypto.control_port_ethertype;
	sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4851 4852
	sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
							sdata->vif.type);
4853

J
Johannes Berg 已提交
4854 4855 4856
	/* kick off associate process */

	ifmgd->assoc_data = assoc_data;
4857
	ifmgd->dtim_period = 0;
4858
	ifmgd->have_beacon = false;
J
Johannes Berg 已提交
4859

4860 4861 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
	/* 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);
4890 4891
	if (err)
		goto err_clear;
J
Johannes Berg 已提交
4892

4893 4894
	rcu_read_lock();
	beacon_ies = rcu_dereference(req->bss->beacon_ies);
4895

4896
	if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4897 4898 4899 4900 4901 4902 4903 4904
	    !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);
4905
		assoc_data->timeout_started = true;
4906 4907 4908 4909 4910
		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);
4911 4912
		u8 dtim_count = 0;

4913 4914 4915 4916
		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;
4917
			dtim_count = tim->dtim_count;
4918
		}
4919
		ifmgd->have_beacon = true;
J
Johannes Berg 已提交
4920
		assoc_data->timeout = jiffies;
4921
		assoc_data->timeout_started = true;
4922

4923
		if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4924 4925 4926 4927 4928
			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;
		}
4929 4930
	} else {
		assoc_data->timeout = jiffies;
4931
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
4932
	}
4933 4934
	rcu_read_unlock();

4935
	run_again(sdata, assoc_data->timeout);
J
Johannes Berg 已提交
4936

P
Paul Stewart 已提交
4937 4938 4939 4940 4941 4942 4943 4944 4945 4946
	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
4947 4948
		sdata_info(sdata, "associating with AP with corrupt %s\n",
			   corrupt_type);
P
Paul Stewart 已提交
4949 4950
	}

4951
	return 0;
J
Johannes Berg 已提交
4952
 err_clear:
4953
	eth_zero_addr(ifmgd->bssid);
4954
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4955 4956 4957 4958
	ifmgd->assoc_data = NULL;
 err_free:
	kfree(assoc_data);
	return err;
4959 4960
}

4961
int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4962
			 struct cfg80211_deauth_request *req)
4963
{
4964
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4965
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4966
	bool tx = !req->local_state_change;
4967

4968 4969 4970 4971 4972 4973
	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));
4974

4975
		drv_mgd_prepare_tx(sdata->local, sdata);
4976 4977
		ieee80211_send_deauth_disassoc(sdata, req->bssid,
					       IEEE80211_STYPE_DEAUTH,
4978
					       req->reason_code, tx,
4979
					       frame_buf);
4980
		ieee80211_destroy_auth_data(sdata, false);
4981 4982 4983
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    req->reason_code);
4984

4985
		return 0;
4986 4987
	}

4988 4989 4990 4991 4992 4993 4994 4995 4996 4997 4998 4999
	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);
5000
		ieee80211_destroy_assoc_data(sdata, false, true);
5001 5002 5003 5004 5005 5006
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    req->reason_code);
		return 0;
	}

5007 5008
	if (ifmgd->associated &&
	    ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
5009 5010 5011 5012 5013
		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));

5014 5015
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       req->reason_code, tx, frame_buf);
5016 5017 5018
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    req->reason_code);
5019 5020
		return 0;
	}
5021

5022
	return -ENOTCONN;
5023
}
5024

5025
int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
5026
			   struct cfg80211_disassoc_request *req)
J
Johannes Berg 已提交
5027
{
5028
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5029
	u8 bssid[ETH_ALEN];
5030
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
J
Johannes Berg 已提交
5031

J
Johannes Berg 已提交
5032 5033 5034 5035 5036 5037
	/*
	 * 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.
	 */
5038
	if (ifmgd->associated != req->bss)
5039 5040
		return -ENOLINK;

J
Johannes Berg 已提交
5041
	sdata_info(sdata,
5042 5043
		   "disassociating from %pM by local choice (Reason: %u=%s)\n",
		   req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
5044

5045
	memcpy(bssid, req->bss->bssid, ETH_ALEN);
5046 5047 5048
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
			       req->reason_code, !req->local_state_change,
			       frame_buf);
5049

5050 5051
	ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
				    req->reason_code);
5052

5053 5054
	return 0;
}
5055

5056
void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5057 5058 5059
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

5060 5061 5062 5063 5064 5065 5066 5067 5068 5069
	/*
	 * 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);
5070
	cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5071

5072
	sdata_lock(sdata);
5073 5074
	if (ifmgd->assoc_data) {
		struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5075
		ieee80211_destroy_assoc_data(sdata, false, false);
5076 5077
		cfg80211_assoc_timeout(sdata->dev, bss);
	}
5078 5079
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
5080 5081 5082 5083 5084 5085 5086
	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);
5087
	del_timer_sync(&ifmgd->timer);
5088
	sdata_unlock(sdata);
5089 5090
}

5091 5092
void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
			       enum nl80211_cqm_rssi_threshold_event rssi_event,
5093
			       s32 rssi_level,
5094 5095 5096 5097
			       gfp_t gfp)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

5098
	trace_api_cqm_rssi_notify(sdata, rssi_event, rssi_level);
J
Johannes Berg 已提交
5099

5100
	cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, rssi_level, gfp);
5101 5102
}
EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5103 5104 5105 5106 5107 5108 5109 5110 5111 5112

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);