mlme.c 144.0 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 - 2016 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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#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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	}

539 540 541 542 543 544
	/*
	 * 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)))
545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562
		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) {
563
			if (other->vif.mu_mimo_owner) {
564 565 566 567 568 569 570
				disable_mu_mimo = true;
				break;
			}
		}
		if (disable_mu_mimo)
			cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
		else
571
			sdata->vif.mu_mimo_owner = true;
572
	}
573

574 575 576 577 578 579 580 581 582 583
	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;
	}

584
	/* reserve and fill IE */
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	pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
586 587 588
	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;
598
	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;
603
	u32 rate_flags, rates = 0;
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604

605
	sdata_assert_lock(sdata);
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606

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	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (WARN_ON(!chanctx_conf)) {
		rcu_read_unlock();
		return;
	}
613
	chan = chanctx_conf->def.chan;
614
	rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
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	rcu_read_unlock();
	sband = local->hw.wiphy->bands[chan->band];
617
	shift = ieee80211_vif_get_shift(&sdata->vif);
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	if (assoc_data->supp_rates_len) {
		/*
		 * Get all rates supported by the device and the AP as
		 * some APs don't like getting a superset of their rates
		 * in the association request (e.g. D-Link DAP 1353 in
		 * b-only mode)...
		 */
626 627 628 629
		rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
						     assoc_data->supp_rates,
						     assoc_data->supp_rates_len,
						     &rates);
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	} else {
		/*
		 * In case AP not provide any supported rates information
		 * before association, we send information element(s) with
		 * all rates that we support.
		 */
636 637 638 639 640 641 642 643
		rates_len = 0;
		for (i = 0; i < sband->n_bitrates; i++) {
			if ((rate_flags & sband->bitrates[i].flags)
			    != rate_flags)
				continue;
			rates |= BIT(i);
			rates_len++;
		}
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	}

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

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

	capab = WLAN_CAPABILITY_ESS;

664
	if (sband->band == NL80211_BAND_2GHZ) {
665 666
		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) &&
673
	    ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
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		capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;

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

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679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720
	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
	memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);

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

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

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

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

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

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

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

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

	/* if present, add any custom IEs that go before HT */
767
	if (assoc_data->ie_len) {
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		static const u8 before_ht[] = {
			WLAN_EID_SSID,
			WLAN_EID_SUPP_RATES,
			WLAN_EID_EXT_SUPP_RATES,
			WLAN_EID_PWR_CAPABILITY,
			WLAN_EID_SUPPORTED_CHANNELS,
			WLAN_EID_RSN,
			WLAN_EID_QOS_CAPA,
			WLAN_EID_RRM_ENABLED_CAPABILITIES,
			WLAN_EID_MOBILITY_DOMAIN,
778 779
			WLAN_EID_FAST_BSS_TRANSITION,	/* reassoc only */
			WLAN_EID_RIC_DATA,		/* reassoc only */
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			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
		};
782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801
		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;

811
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
812
		ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
813
				    sband, chan, sdata->smps_mode);
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815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834
	/* 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,
		};
835 836

		/* RIC already taken above, so no need to handle here anymore */
837 838 839 840 841 842 843 844
		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;
	}

845
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
846 847
		ieee80211_add_vht_ie(sdata, skb, sband,
				     &assoc_data->ap_vht_cap);
848

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	/* if present, add any custom non-vendor IEs that go after HT */
850
	if (assoc_data->ie_len) {
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851 852 853 854 855 856 857 858
		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;
	}

859 860
	if (assoc_data->wmm) {
		if (assoc_data->uapsd) {
861 862
			qos_info = ifmgd->uapsd_queues;
			qos_info |= (ifmgd->uapsd_max_sp_len <<
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				     IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
		} else {
			qos_info = 0;
		}

868
		pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
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869 870 871
	}

	/* add any remaining custom (i.e. vendor specific here) IEs */
872
	if (assoc_data->ie_len) {
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		noffset = assoc_data->ie_len;
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
	}

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	drv_mgd_prepare_tx(local, sdata);

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880
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
881
	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
882 883
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
						IEEE80211_TX_INTFL_MLME_CONN_TX;
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	ieee80211_tx_skb(sdata, skb);
}

887 888 889 890 891 892
void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_pspoll *pspoll;
	struct sk_buff *skb;

893 894
	skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
	if (!skb)
895 896
		return;

897 898
	pspoll = (struct ieee80211_pspoll *) skb->data;
	pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
899

900 901
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
902 903
}

904 905
void ieee80211_send_nullfunc(struct ieee80211_local *local,
			     struct ieee80211_sub_if_data *sdata,
906
			     bool powersave)
907 908
{
	struct sk_buff *skb;
909
	struct ieee80211_hdr_3addr *nullfunc;
910
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
911

912 913
	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
	if (!skb)
914 915
		return;

916
	nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
917
	if (powersave)
918
		nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
919

920 921
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
					IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
922

923
	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
924 925
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;

926
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
927 928
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;

929
	ieee80211_tx_skb(sdata, skb);
930 931
}

932 933 934 935 936 937 938 939 940 941 942
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);
943
	if (!skb)
944
		return;
945

946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961
	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);
}

962 963 964 965 966
/* 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);
967
	struct ieee80211_local *local = sdata->local;
968
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
969
	int ret;
970

971
	if (!ieee80211_sdata_running(sdata))
972 973
		return;

974
	sdata_lock(sdata);
975 976 977
	mutex_lock(&local->mtx);
	mutex_lock(&local->chanctx_mtx);

978 979
	if (!ifmgd->associated)
		goto out;
980

981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014
	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)) {
1015
		sdata_info(sdata,
1016
			   "failed to finalize channel switch, disconnecting\n");
1017 1018 1019 1020
		ieee80211_queue_work(&sdata->local->hw,
				     &ifmgd->csa_connection_drop_work);
		goto out;
	}
1021

1022
	/* XXX: shouldn't really modify cfg80211-owned data! */
1023
	ifmgd->associated->channel = sdata->csa_chandef.chan;
1024

1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044
	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);
1045

1046 1047 1048 1049 1050
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
1051

1052 1053 1054
	sdata->vif.csa_active = false;
	ifmgd->csa_waiting_bcn = false;

1055 1056 1057 1058 1059 1060
	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);
1061
		return;
1062
	}
1063 1064

	cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1065 1066
}

1067 1068
void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
{
J
Johannes Berg 已提交
1069 1070
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1071 1072 1073

	trace_api_chswitch_done(sdata, success);
	if (!success) {
1074 1075 1076 1077 1078 1079
		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);
1080 1081 1082 1083
	}
}
EXPORT_SYMBOL(ieee80211_chswitch_done);

1084 1085 1086 1087
static void ieee80211_chswitch_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
1088

1089
	ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1090 1091
}

1092
static void
J
Johannes Berg 已提交
1093
ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1094 1095
				 u64 timestamp, u32 device_timestamp,
				 struct ieee802_11_elems *elems,
1096
				 bool beacon)
1097
{
1098
	struct ieee80211_local *local = sdata->local;
1099
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1100
	struct cfg80211_bss *cbss = ifmgd->associated;
1101
	struct ieee80211_chanctx_conf *conf;
J
Johannes Berg 已提交
1102
	struct ieee80211_chanctx *chanctx;
1103
	enum nl80211_band current_band;
1104
	struct ieee80211_csa_ie csa_ie;
1105
	struct ieee80211_channel_switch ch_switch;
1106
	int res;
1107

1108
	sdata_assert_lock(sdata);
1109

1110
	if (!cbss)
1111 1112
		return;

1113
	if (local->scanning)
1114 1115
		return;

1116
	/* disregard subsequent announcements if we are already processing */
1117
	if (sdata->vif.csa_active)
1118 1119
		return;

1120
	current_band = cbss->channel->band;
1121
	memset(&csa_ie, 0, sizeof(csa_ie));
1122
	res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1123
					   ifmgd->flags,
1124
					   ifmgd->associated->bssid, &csa_ie);
1125
	if (res	< 0)
1126
		ieee80211_queue_work(&local->hw,
1127
				     &ifmgd->csa_connection_drop_work);
1128
	if (res)
1129
		return;
1130

1131
	if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1132 1133 1134
				     IEEE80211_CHAN_DISABLED)) {
		sdata_info(sdata,
			   "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1135
			   ifmgd->associated->bssid,
1136 1137 1138
			   csa_ie.chandef.chan->center_freq,
			   csa_ie.chandef.width, csa_ie.chandef.center_freq1,
			   csa_ie.chandef.center_freq2);
1139 1140 1141 1142 1143
		ieee80211_queue_work(&local->hw,
				     &ifmgd->csa_connection_drop_work);
		return;
	}

1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154
	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;
	}

1155 1156 1157 1158 1159 1160 1161 1162
	/*
	 * 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);

1163
	mutex_lock(&local->mtx);
1164
	mutex_lock(&local->chanctx_mtx);
1165 1166 1167 1168 1169
	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");
1170
		goto drop_connection;
1171 1172 1173 1174
	}

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

1175
	if (local->use_chanctx &&
1176
	    !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1177 1178
		sdata_info(sdata,
			   "driver doesn't support chan-switch with channel contexts\n");
1179
		goto drop_connection;
J
Johannes Berg 已提交
1180 1181
	}

1182 1183 1184 1185 1186 1187 1188 1189 1190
	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");
1191
		goto drop_connection;
1192 1193
	}

1194 1195 1196
	res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
					    chanctx->mode, false);
	if (res) {
J
Johannes Berg 已提交
1197
		sdata_info(sdata,
1198 1199
			   "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
			   res);
1200
		goto drop_connection;
J
Johannes Berg 已提交
1201
	}
1202
	mutex_unlock(&local->chanctx_mtx);
J
Johannes Berg 已提交
1203

1204
	sdata->vif.csa_active = true;
1205
	sdata->csa_chandef = csa_ie.chandef;
1206
	sdata->csa_block_tx = csa_ie.mode;
1207
	ifmgd->csa_ignored_same_chan = false;
J
Johannes Berg 已提交
1208

1209
	if (sdata->csa_block_tx)
1210 1211
		ieee80211_stop_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
1212
	mutex_unlock(&local->mtx);
1213

1214 1215 1216
	cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
					  csa_ie.count);

1217
	if (local->ops->channel_switch) {
1218
		/* use driver's channel switch callback */
1219
		drv_channel_switch(local, sdata, &ch_switch);
1220 1221 1222 1223
		return;
	}

	/* channel switch handled in software */
1224
	if (csa_ie.count <= 1)
1225
		ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1226
	else
1227
		mod_timer(&ifmgd->chswitch_timer,
1228 1229
			  TU_TO_EXP_TIME((csa_ie.count - 1) *
					 cbss->beacon_interval));
1230 1231 1232 1233 1234
	return;
 drop_connection:
	ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
	mutex_unlock(&local->chanctx_mtx);
	mutex_unlock(&local->mtx);
1235 1236
}

1237 1238 1239 1240 1241 1242
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)
1243
{
1244 1245
	struct ieee80211_country_ie_triplet *triplet;
	int chan = ieee80211_frequency_to_channel(channel->center_freq);
1246
	int i, chan_increment;
1247
	bool have_chan_pwr = false;
1248

1249 1250
	/* Invalid IE */
	if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1251
		return false;
1252

1253 1254 1255 1256 1257 1258 1259
	triplet = (void *)(country_ie + 3);
	country_ie_len -= 3;

	switch (channel->band) {
	default:
		WARN_ON_ONCE(1);
		/* fall through */
1260 1261
	case NL80211_BAND_2GHZ:
	case NL80211_BAND_60GHZ:
1262 1263
		chan_increment = 1;
		break;
1264
	case NL80211_BAND_5GHZ:
1265 1266
		chan_increment = 4;
		break;
1267
	}
1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278

	/* 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;
1279
				*chan_pwr = triplet->chans.max_power;
1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290
				break;
			}
		}
		if (have_chan_pwr)
			break;

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

1291
	if (have_chan_pwr && pwr_constr_elem)
1292
		*pwr_reduction = *pwr_constr_elem;
1293 1294 1295
	else
		*pwr_reduction = 0;

1296 1297 1298
	return have_chan_pwr;
}

1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312
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];
}

1313 1314 1315 1316
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,
1317 1318
				       const u8 *pwr_constr_ie,
				       const u8 *cisco_dtpc_ie)
1319
{
1320 1321 1322
	bool has_80211h_pwr = false, has_cisco_pwr = false;
	int chan_pwr = 0, pwr_reduction_80211h = 0;
	int pwr_level_cisco, pwr_level_80211h;
1323
	int new_ap_level;
1324
	__le16 capab = mgmt->u.probe_resp.capab_info;
1325

1326 1327 1328
	if (country_ie &&
	    (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
	     capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1329 1330 1331
		has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
			sdata, channel, country_ie, country_ie_len,
			pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1332 1333 1334 1335 1336 1337 1338 1339
		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;
1340
	}
1341

1342
	if (!has_80211h_pwr && !has_cisco_pwr)
1343
		return 0;
1344

1345 1346 1347 1348 1349
	/* 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)) {
1350 1351 1352 1353 1354
		new_ap_level = pwr_level_80211h;

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

1355 1356 1357 1358
		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);
1359
	} else {  /* has_cisco_pwr is always true here. */
1360 1361 1362 1363 1364
		new_ap_level = pwr_level_cisco;

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

1365 1366 1367
		sdata_dbg(sdata,
			  "Limiting TX power to %d dBm as advertised by %pM\n",
			  pwr_level_cisco, sdata->u.mgd.bssid);
1368
	}
1369

1370 1371 1372 1373
	sdata->ap_power_level = new_ap_level;
	if (__ieee80211_recalc_txpower(sdata))
		return BSS_CHANGED_TXPOWER;
	return 0;
1374 1375
}

1376 1377 1378 1379 1380 1381
/* 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
1382 1383 1384 1385
	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
1386
	if (local->scanning)
J
Johannes Berg 已提交
1387 1388
		return;

1389
	if (conf->dynamic_ps_timeout > 0 &&
1390
	    !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1391 1392 1393
		mod_timer(&local->dynamic_ps_timer, jiffies +
			  msecs_to_jiffies(conf->dynamic_ps_timeout));
	} else {
1394
		if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1395
			ieee80211_send_nullfunc(local, sdata, true);
1396

1397 1398
		if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
		    ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1399 1400 1401 1402
			return;

		conf->flags |= IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419
	}
}

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);
	}
}

1420 1421 1422 1423
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
1424
	bool authorized = false;
1425 1426 1427 1428

	if (!mgd->powersave)
		return false;

1429 1430 1431
	if (mgd->broken_ap)
		return false;

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

1435
	if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1436 1437
		return false;

1438
	if (!mgd->have_beacon)
1439 1440
		return false;

1441 1442 1443
	rcu_read_lock();
	sta = sta_info_get(sdata, mgd->bssid);
	if (sta)
J
Johannes Berg 已提交
1444
		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1445 1446
	rcu_read_unlock();

J
Johannes Berg 已提交
1447
	return authorized;
1448 1449
}

1450
/* need to hold RTNL or interface lock */
J
Johannes Berg 已提交
1451
void ieee80211_recalc_ps(struct ieee80211_local *local)
1452 1453 1454
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;
1455
	int timeout;
1456

1457
	if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1458 1459 1460 1461 1462
		local->ps_sdata = NULL;
		return;
	}

	list_for_each_entry(sdata, &local->interfaces, list) {
1463
		if (!ieee80211_sdata_running(sdata))
1464
			continue;
1465 1466 1467 1468 1469 1470 1471 1472
		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;
		}
1473 1474 1475 1476 1477 1478
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

1479
	if (count == 1 && ieee80211_powersave_allowed(found)) {
J
Johannes Berg 已提交
1480
		u8 dtimper = found->u.mgd.dtim_period;
1481 1482 1483 1484 1485
		s32 beaconint_us;

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

1486
		timeout = local->dynamic_ps_forced_timeout;
J
Johannes Berg 已提交
1487 1488
		if (timeout < 0)
			timeout = 100;
1489
		local->hw.conf.dynamic_ps_timeout = timeout;
1490

J
Johannes Berg 已提交
1491 1492 1493 1494 1495 1496
		/* 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;
1497
	} else {
1498
		local->ps_sdata = NULL;
1499
	}
1500 1501 1502 1503

	ieee80211_change_ps(local);
}

E
Eliad Peller 已提交
1504 1505 1506 1507 1508 1509 1510 1511 1512 1513
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);
	}
}

1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525
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,
1526
					IEEE80211_MAX_QUEUE_MAP,
1527 1528
					IEEE80211_QUEUE_STOP_REASON_PS,
					false);
1529 1530 1531 1532 1533 1534 1535 1536
}

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;
1537
	struct ieee80211_if_managed *ifmgd;
1538 1539
	unsigned long flags;
	int q;
1540 1541 1542 1543 1544

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

1545 1546
	ifmgd = &sdata->u.mgd;

1547 1548 1549
	if (local->hw.conf.flags & IEEE80211_CONF_PS)
		return;

1550
	if (local->hw.conf.dynamic_ps_timeout > 0) {
1551 1552
		/* don't enter PS if TX frames are pending */
		if (drv_tx_frames_pending(local)) {
1553 1554 1555 1556 1557
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
			return;
		}
1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575

		/*
		 * 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);
1576 1577
	}

1578
	if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1579
	    !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1580
		if (drv_tx_frames_pending(local)) {
1581 1582 1583
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
1584
		} else {
1585
			ieee80211_send_nullfunc(local, sdata, true);
1586
			/* Flush to get the tx status of nullfunc frame */
1587
			ieee80211_flush_queues(local, sdata, false);
1588
		}
1589 1590
	}

1591 1592
	if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
	      ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1593 1594 1595 1596 1597
	    (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);
	}
1598 1599 1600 1601 1602 1603
}

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

1604
	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1605 1606
}

1607 1608
void ieee80211_dfs_cac_timer_work(struct work_struct *work)
{
1609
	struct delayed_work *delayed_work = to_delayed_work(work);
1610 1611 1612
	struct ieee80211_sub_if_data *sdata =
		container_of(delayed_work, struct ieee80211_sub_if_data,
			     dfs_cac_timer_work);
1613
	struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1614

1615 1616 1617 1618 1619 1620 1621 1622
	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);
1623 1624
}

1625 1626 1627 1628 1629
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;
1630
	bool ret = false;
1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674
	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;
1675 1676 1677 1678 1679 1680
			/* 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.
1681
			 */
1682 1683
			if (non_acm_ac >= IEEE80211_NUM_ACS)
				non_acm_ac = IEEE80211_AC_BK;
1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717
			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
1718
/* MLME */
1719
static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1720
				     struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
1721
				     const u8 *wmm_param, size_t wmm_param_len)
1722
{
1723
	struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1724
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1725
	size_t left;
1726
	int count, ac;
J
Johannes Berg 已提交
1727 1728
	const u8 *pos;
	u8 uapsd_queues = 0;
1729

1730
	if (!local->ops->conf_tx)
1731
		return false;
1732

J
Johannes Berg 已提交
1733
	if (local->hw.queues < IEEE80211_NUM_ACS)
1734
		return false;
1735 1736

	if (!wmm_param)
1737
		return false;
1738

1739
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1740
		return false;
K
Kalle Valo 已提交
1741 1742

	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1743
		uapsd_queues = ifmgd->uapsd_queues;
K
Kalle Valo 已提交
1744

1745
	count = wmm_param[6] & 0x0f;
1746
	if (count == ifmgd->wmm_last_param_set)
1747
		return false;
1748
	ifmgd->wmm_last_param_set = count;
1749 1750 1751 1752 1753 1754

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

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

Y
Yoni Divinsky 已提交
1755
	sdata->wmm_acm = 0;
1756 1757 1758
	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
1759
		bool uapsd = false;
1760 1761

		switch (aci) {
1762
		case 1: /* AC_BK */
1763
			ac = IEEE80211_AC_BK;
J
Johannes Berg 已提交
1764
			if (acm)
Y
Yoni Divinsky 已提交
1765
				sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
K
Kalle Valo 已提交
1766 1767
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
				uapsd = true;
1768
			break;
1769
		case 2: /* AC_VI */
1770
			ac = IEEE80211_AC_VI;
J
Johannes Berg 已提交
1771
			if (acm)
Y
Yoni Divinsky 已提交
1772
				sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
K
Kalle Valo 已提交
1773 1774
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
				uapsd = true;
1775
			break;
1776
		case 3: /* AC_VO */
1777
			ac = IEEE80211_AC_VO;
J
Johannes Berg 已提交
1778
			if (acm)
Y
Yoni Divinsky 已提交
1779
				sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
K
Kalle Valo 已提交
1780 1781
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
				uapsd = true;
1782
			break;
1783
		case 0: /* AC_BE */
1784
		default:
1785
			ac = IEEE80211_AC_BE;
J
Johannes Berg 已提交
1786
			if (acm)
Y
Yoni Divinsky 已提交
1787
				sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
K
Kalle Valo 已提交
1788 1789
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
				uapsd = true;
1790 1791 1792
			break;
		}

1793
		params[ac].aifs = pos[0] & 0x0f;
1794

1795
		if (params[ac].aifs < 2) {
1796 1797
			sdata_info(sdata,
				   "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1798 1799
				   params[ac].aifs, aci);
			params[ac].aifs = 2;
1800
		}
1801 1802 1803 1804 1805
		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
1806

1807 1808 1809 1810 1811 1812 1813 1814 1815
		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
1816
		mlme_dbg(sdata,
1817 1818 1819 1820 1821 1822 1823 1824
			 "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
1825
			sdata_err(sdata,
1826 1827
				  "failed to set TX queue parameters for AC %d\n",
				  ac);
1828
	}
1829 1830

	/* enable WMM or activate new settings */
1831
	sdata->vif.bss_conf.qos = true;
1832
	return true;
1833 1834
}

1835 1836 1837 1838
static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
{
	lockdep_assert_held(&sdata->local->mtx);

1839
	sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1840 1841 1842 1843 1844 1845 1846 1847 1848 1849
	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
1850 1851
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
1852
{
J
Johannes Berg 已提交
1853
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1854
	u32 changed = 0;
J
Johannes Berg 已提交
1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867
	bool use_protection;
	bool use_short_preamble;
	bool use_short_slot;

	if (erp_valid) {
		use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
		use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
	} else {
		use_protection = false;
		use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
	}

	use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1868
	if (ieee80211_get_sdata_band(sdata) == NL80211_BAND_5GHZ)
1869
		use_short_slot = true;
1870

1871 1872 1873
	if (use_protection != bss_conf->use_cts_prot) {
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
1874
	}
1875

1876 1877
	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
1878
		changed |= BSS_CHANGED_ERP_PREAMBLE;
1879
	}
1880

J
Johannes Berg 已提交
1881 1882 1883
	if (use_short_slot != bss_conf->use_short_slot) {
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
1884 1885 1886 1887 1888
	}

	return changed;
}

1889
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1890
				     struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
1891
				     u32 bss_info_changed)
1892
{
1893
	struct ieee80211_bss *bss = (void *)cbss->priv;
1894
	struct ieee80211_local *local = sdata->local;
1895
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1896

J
Johannes Berg 已提交
1897
	bss_info_changed |= BSS_CHANGED_ASSOC;
1898
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1899
		bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1900

1901
	sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1902
		beacon_loss_count * bss_conf->beacon_int));
1903

1904 1905
	sdata->u.mgd.associated = cbss;
	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1906

1907 1908
	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;

1909 1910
	if (sdata->vif.p2p ||
	    sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
1911
		const struct cfg80211_bss_ies *ies;
1912

1913 1914 1915 1916 1917 1918 1919 1920
		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
1921 1922
					(u8 *) &bss_conf->p2p_noa_attr,
					sizeof(bss_conf->p2p_noa_attr));
1923
			if (ret >= 2) {
J
Janusz Dziedzic 已提交
1924 1925
				sdata->u.mgd.p2p_noa_index =
					bss_conf->p2p_noa_attr.index;
1926 1927
				bss_info_changed |= BSS_CHANGED_P2P_PS;
			}
1928
		}
1929
		rcu_read_unlock();
1930 1931
	}

J
Johannes Berg 已提交
1932
	/* just to be sure */
1933
	ieee80211_stop_poll(sdata);
J
Johannes Berg 已提交
1934

1935
	ieee80211_led_assoc(local, 1);
1936

1937
	if (sdata->u.mgd.have_beacon) {
1938 1939 1940 1941 1942 1943 1944
		/*
		 * 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;
1945
		bss_conf->beacon_rate = bss->beacon_rate;
1946
		bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1947
	} else {
1948
		bss_conf->beacon_rate = NULL;
1949
		bss_conf->dtim_period = 0;
1950
	}
1951

1952
	bss_conf->assoc = 1;
1953

1954
	/* Tell the driver to monitor connection quality (if supported) */
1955
	if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1956
	    bss_conf->cqm_rssi_thold)
1957 1958
		bss_info_changed |= BSS_CHANGED_CQM;

1959
	/* Enable ARP filtering */
1960
	if (bss_conf->arp_addr_cnt)
1961 1962
		bss_info_changed |= BSS_CHANGED_ARP_FILTER;

J
Johannes Berg 已提交
1963
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1964

J
Johannes Berg 已提交
1965
	mutex_lock(&local->iflist_mtx);
J
Johannes Berg 已提交
1966
	ieee80211_recalc_ps(local);
J
Johannes Berg 已提交
1967
	mutex_unlock(&local->iflist_mtx);
1968

1969
	ieee80211_recalc_smps(sdata);
E
Eliad Peller 已提交
1970 1971
	ieee80211_recalc_ps_vif(sdata);

1972
	netif_carrier_on(sdata->dev);
1973 1974
}

1975
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1976 1977
				   u16 stype, u16 reason, bool tx,
				   u8 *frame_buf)
1978
{
1979
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1980
	struct ieee80211_local *local = sdata->local;
1981
	u32 changed = 0;
1982

1983
	sdata_assert_lock(sdata);
1984

1985 1986 1987
	if (WARN_ON_ONCE(tx && !frame_buf))
		return;

J
Johannes Berg 已提交
1988 1989 1990
	if (WARN_ON(!ifmgd->associated))
		return;

1991 1992
	ieee80211_stop_poll(sdata);

1993
	ifmgd->associated = NULL;
1994 1995
	netif_carrier_off(sdata->dev);

1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006
	/*
	 * 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
2007 2008 2009
	/* disable per-vif ps */
	ieee80211_recalc_ps_vif(sdata);

2010 2011 2012
	/* make sure ongoing transmission finishes */
	synchronize_net();

2013 2014 2015 2016 2017 2018
	/*
	 * 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.
	 */
2019
	if (tx)
2020
		ieee80211_flush_queues(local, sdata, true);
2021

2022 2023
	/* deauthenticate/disassociate now */
	if (tx || frame_buf)
2024 2025
		ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
					       reason, tx, frame_buf);
2026

2027
	/* flush out frame - make sure the deauth was actually sent */
2028
	if (tx)
2029
		ieee80211_flush_queues(local, sdata, false);
2030

2031
	/* clear bssid only after building the needed mgmt frames */
2032
	eth_zero_addr(ifmgd->bssid);
2033

2034
	/* remove AP and TDLS peers */
2035
	sta_info_flush(sdata);
2036 2037

	/* finally reset all BSS / config parameters */
2038 2039 2040
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
J
Johannes Berg 已提交
2041 2042
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
2043

J
Janusz Dziedzic 已提交
2044 2045 2046
	ifmgd->p2p_noa_index = -1;
	memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
	       sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2047

2048
	/* on the next assoc, re-program HT/VHT parameters */
B
Ben Greear 已提交
2049 2050
	memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
	memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2051 2052
	memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
	memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2053 2054 2055 2056 2057 2058 2059

	/* 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;
2060
	sdata->vif.mu_mimo_owner = false;
2061

2062
	sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2063

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

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

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

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

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

2081 2082 2083 2084
	del_timer_sync(&sdata->u.mgd.conn_mon_timer);
	del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
	del_timer_sync(&sdata->u.mgd.timer);
	del_timer_sync(&sdata->u.mgd.chswitch_timer);
2085

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

2089
	ifmgd->have_beacon = false;
2090

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

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

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

2109
	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2110
}
2111

2112 2113 2114 2115 2116 2117 2118 2119
void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
			     struct ieee80211_hdr *hdr)
{
	/*
	 * We can postpone the mgd.timer whenever receiving unicast frames
	 * from AP because we know that the connection is working both ways
	 * at that time. But multicast frames (and hence also beacons) must
	 * be ignored here, because we need to trigger the timer during
J
Johannes Berg 已提交
2120 2121
	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
2122
	 */
J
Johannes Berg 已提交
2123 2124 2125
	if (is_multicast_ether_addr(hdr->addr1))
		return;

2126
	ieee80211_sta_reset_conn_monitor(sdata);
2127
}
2128

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

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

2138
	__ieee80211_stop_poll(sdata);
2139 2140

	mutex_lock(&local->iflist_mtx);
J
Johannes Berg 已提交
2141
	ieee80211_recalc_ps(local);
2142
	mutex_unlock(&local->iflist_mtx);
2143

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

	/*
	 * We've received a probe response, but are not sure whether
	 * we have or will be receiving any beacons or data, so let's
	 * schedule the timers again, just in case.
	 */
	ieee80211_sta_reset_beacon_monitor(sdata);

	mod_timer(&ifmgd->conn_mon_timer,
		  round_jiffies_up(jiffies +
				   IEEE80211_CONNECTION_IDLE_TIME));
2157 2158
out:
	mutex_unlock(&local->mtx);
2159 2160
}

2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195
static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
					   struct ieee80211_hdr *hdr,
					   u16 tx_time)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
	int ac = ieee80211_ac_from_tid(tid);
	struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
	unsigned long now = jiffies;

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

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

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

	if (tx_tspec->downgraded)
		return;

	tx_tspec->consumed_tx_time += tx_time;

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

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

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

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

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

2218 2219 2220 2221
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ssid;
2222
	u8 *dst = ifmgd->associated->bssid;
2223
	u8 unicast_limit = max(1, max_probe_tries - 3);
J
Johannes Berg 已提交
2224
	struct sta_info *sta;
2225 2226 2227 2228 2229 2230 2231 2232

	/*
	 * 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;
2233

2234 2235 2236 2237 2238 2239 2240
	/*
	 * 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.
	 */
2241 2242
	ifmgd->probe_send_count++;

J
Johannes Berg 已提交
2243 2244 2245 2246 2247 2248 2249 2250
	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);
	}

2251
	if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2252
		ifmgd->nullfunc_failed = false;
2253
		ieee80211_send_nullfunc(sdata->local, sdata, false);
2254
	} else {
2255 2256
		int ssid_len;

2257
		rcu_read_lock();
2258
		ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2259 2260 2261 2262 2263
		if (WARN_ON_ONCE(ssid == NULL))
			ssid_len = 0;
		else
			ssid_len = ssid[1];

2264
		ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2265
					 ssid + 2, ssid_len, NULL,
2266
					 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
2267
					 ifmgd->associated->channel, false);
2268
		rcu_read_unlock();
2269
	}
2270

2271
	ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2272
	run_again(sdata, ifmgd->probe_timeout);
2273 2274
}

J
Johannes Berg 已提交
2275 2276
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
				   bool beacon)
2277 2278
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
2279
	bool already = false;
2280

2281
	if (!ieee80211_sdata_running(sdata))
2282 2283
		return;

2284
	sdata_lock(sdata);
2285 2286 2287 2288

	if (!ifmgd->associated)
		goto out;

2289 2290 2291 2292 2293 2294 2295
	mutex_lock(&sdata->local->mtx);

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

2296
	if (beacon) {
J
Johannes Berg 已提交
2297
		mlme_dbg_ratelimited(sdata,
2298 2299
				     "detected beacon loss from AP (missed %d beacons) - probing\n",
				     beacon_loss_count);
J
Johannes Berg 已提交
2300

2301
		ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2302
	}
2303

J
Johannes Berg 已提交
2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314
	/*
	 * 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!
	 */
2315
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
J
Johannes Berg 已提交
2316 2317
		already = true;

E
Eliad Peller 已提交
2318 2319
	ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;

2320 2321
	mutex_unlock(&sdata->local->mtx);

J
Johannes Berg 已提交
2322 2323 2324
	if (already)
		goto out;

2325
	mutex_lock(&sdata->local->iflist_mtx);
J
Johannes Berg 已提交
2326
	ieee80211_recalc_ps(sdata->local);
2327 2328
	mutex_unlock(&sdata->local->iflist_mtx);

2329 2330
	ifmgd->probe_send_count = 0;
	ieee80211_mgd_probe_ap_send(sdata);
2331
 out:
2332
	sdata_unlock(sdata);
2333 2334
}

2335 2336 2337 2338 2339
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;
2340
	struct cfg80211_bss *cbss;
2341 2342
	struct sk_buff *skb;
	const u8 *ssid;
2343
	int ssid_len;
2344 2345 2346 2347

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

2348
	sdata_assert_lock(sdata);
2349

2350 2351 2352 2353 2354 2355 2356
	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
2357 2358
		return NULL;

2359
	rcu_read_lock();
2360
	ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2361 2362 2363 2364 2365
	if (WARN_ON_ONCE(ssid == NULL))
		ssid_len = 0;
	else
		ssid_len = ssid[1];

2366
	skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
J
Johannes Berg 已提交
2367
					(u32) -1, cbss->channel,
2368
					ssid + 2, ssid_len,
2369
					NULL, 0, true);
2370
	rcu_read_unlock();
2371 2372 2373 2374 2375

	return skb;
}
EXPORT_SYMBOL(ieee80211_ap_probereq_get);

2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393
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);
}

2394
static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2395
{
2396
	struct ieee80211_local *local = sdata->local;
2397
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2398
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2399

2400
	sdata_lock(sdata);
2401
	if (!ifmgd->associated) {
2402
		sdata_unlock(sdata);
2403 2404 2405
		return;
	}

2406 2407 2408 2409 2410
	/* 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);

2411 2412
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
			       WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2413
			       true, frame_buf);
2414
	mutex_lock(&local->mtx);
2415
	sdata->vif.csa_active = false;
2416
	ifmgd->csa_waiting_bcn = false;
2417 2418 2419 2420 2421
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
2422
	mutex_unlock(&local->mtx);
2423

2424 2425 2426
	ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
				    WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);

2427
	sdata_unlock(sdata);
2428 2429
}

2430
static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
J
Johannes Berg 已提交
2431 2432 2433
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
2434
			     u.mgd.beacon_connection_loss_work);
2435 2436
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

2437 2438
	if (ifmgd->associated)
		ifmgd->beacon_loss_count++;
J
Johannes Berg 已提交
2439

2440
	if (ifmgd->connection_loss) {
2441 2442
		sdata_info(sdata, "Connection to AP %pM lost\n",
			   ifmgd->bssid);
2443
		__ieee80211_disconnect(sdata);
2444
	} else {
2445
		ieee80211_mgd_probe_ap(sdata, true);
2446 2447 2448 2449 2450 2451 2452 2453 2454
	}
}

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);

2455
	__ieee80211_disconnect(sdata);
J
Johannes Berg 已提交
2456 2457
}

2458 2459 2460
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2461
	struct ieee80211_hw *hw = &sdata->local->hw;
2462

J
Johannes Berg 已提交
2463 2464
	trace_api_beacon_loss(sdata);

2465
	sdata->u.mgd.connection_loss = false;
2466
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2467 2468 2469
}
EXPORT_SYMBOL(ieee80211_beacon_loss);

2470 2471 2472 2473 2474
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
2475 2476
	trace_api_connection_loss(sdata);

2477
	sdata->u.mgd.connection_loss = true;
2478 2479 2480 2481 2482
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_connection_loss);


J
Johannes Berg 已提交
2483 2484 2485 2486 2487
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;

2488
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2489 2490

	if (!assoc) {
2491 2492 2493 2494 2495 2496
		/*
		 * 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
2497 2498
		sta_info_destroy_addr(sdata, auth_data->bss->bssid);

2499
		eth_zero_addr(sdata->u.mgd.bssid);
J
Johannes Berg 已提交
2500
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2501
		sdata->u.mgd.flags = 0;
2502
		mutex_lock(&sdata->local->mtx);
J
Johannes Berg 已提交
2503
		ieee80211_vif_release_channel(sdata);
2504
		mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
2505 2506
	}

2507
	cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
J
Johannes Berg 已提交
2508 2509 2510 2511
	kfree(auth_data);
	sdata->u.mgd.auth_data = NULL;
}

2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530
static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
					 bool assoc)
{
	struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;

	sdata_assert_lock(sdata);

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

		eth_zero_addr(sdata->u.mgd.bssid);
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
		sdata->u.mgd.flags = 0;
2531 2532
		sdata->vif.mu_mimo_owner = false;

2533 2534 2535 2536 2537 2538 2539 2540 2541
		mutex_lock(&sdata->local->mtx);
		ieee80211_vif_release_channel(sdata);
		mutex_unlock(&sdata->local->mtx);
	}

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

J
Johannes Berg 已提交
2542 2543 2544
static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
{
2545
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
2546 2547 2548
	struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
	u8 *pos;
	struct ieee802_11_elems elems;
2549
	u32 tx_flags = 0;
J
Johannes Berg 已提交
2550 2551

	pos = mgmt->u.auth.variable;
2552
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2553 2554 2555
	if (!elems.challenge)
		return;
	auth_data->expected_transaction = 4;
J
Johannes Berg 已提交
2556
	drv_mgd_prepare_tx(sdata->local, sdata);
2557
	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2558 2559
		tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
			   IEEE80211_TX_INTFL_MLME_CONN_TX;
2560
	ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
J
Johannes Berg 已提交
2561 2562 2563
			    elems.challenge - 2, elems.challenge_len + 2,
			    auth_data->bss->bssid, auth_data->bss->bssid,
			    auth_data->key, auth_data->key_len,
2564
			    auth_data->key_idx, tx_flags);
J
Johannes Berg 已提交
2565 2566
}

2567 2568
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
2569 2570 2571 2572 2573
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u8 bssid[ETH_ALEN];
	u16 auth_alg, auth_transaction, status_code;
	struct sta_info *sta;
2574 2575 2576 2577
	struct ieee80211_event event = {
		.type = MLME_EVENT,
		.u.mlme.data = AUTH_EVENT,
	};
J
Johannes Berg 已提交
2578

2579
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2580 2581

	if (len < 24 + 6)
2582
		return;
J
Johannes Berg 已提交
2583 2584

	if (!ifmgd->auth_data || ifmgd->auth_data->done)
2585
		return;
J
Johannes Berg 已提交
2586 2587 2588

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

2589
	if (!ether_addr_equal(bssid, mgmt->bssid))
2590
		return;
J
Johannes Berg 已提交
2591 2592 2593 2594 2595 2596

	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 ||
2597 2598 2599 2600 2601
	    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);
2602
		return;
2603
	}
J
Johannes Berg 已提交
2604 2605

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
2606 2607
		sdata_info(sdata, "%pM denied authentication (status %d)\n",
			   mgmt->sa, status_code);
2608
		ieee80211_destroy_auth_data(sdata, false);
2609
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2610 2611 2612
		event.u.mlme.status = MLME_DENIED;
		event.u.mlme.reason = status_code;
		drv_event_callback(sdata->local, sdata, &event);
2613
		return;
J
Johannes Berg 已提交
2614 2615 2616 2617 2618 2619
	}

	switch (ifmgd->auth_data->algorithm) {
	case WLAN_AUTH_OPEN:
	case WLAN_AUTH_LEAP:
	case WLAN_AUTH_FT:
2620
	case WLAN_AUTH_SAE:
2621 2622 2623
	case WLAN_AUTH_FILS_SK:
	case WLAN_AUTH_FILS_SK_PFS:
	case WLAN_AUTH_FILS_PK:
J
Johannes Berg 已提交
2624 2625 2626 2627 2628
		break;
	case WLAN_AUTH_SHARED_KEY:
		if (ifmgd->auth_data->expected_transaction != 4) {
			ieee80211_auth_challenge(sdata, mgmt, len);
			/* need another frame */
2629
			return;
J
Johannes Berg 已提交
2630 2631 2632 2633 2634
		}
		break;
	default:
		WARN_ONCE(1, "invalid auth alg %d",
			  ifmgd->auth_data->algorithm);
2635
		return;
J
Johannes Berg 已提交
2636 2637
	}

2638 2639
	event.u.mlme.status = MLME_SUCCESS;
	drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
2640
	sdata_info(sdata, "authenticated\n");
J
Johannes Berg 已提交
2641 2642
	ifmgd->auth_data->done = true;
	ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2643
	ifmgd->auth_data->timeout_started = true;
2644
	run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
2645

2646 2647 2648 2649 2650 2651
	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.
		 */
2652
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2653
		return;
2654 2655
	}

J
Johannes Berg 已提交
2656 2657 2658 2659 2660 2661 2662 2663
	/* 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
2664
		sdata_info(sdata, "failed moving %pM to auth\n", bssid);
J
Johannes Berg 已提交
2665 2666 2667 2668
		goto out_err;
	}
	mutex_unlock(&sdata->local->sta_mtx);

2669
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2670
	return;
J
Johannes Berg 已提交
2671 2672 2673 2674 2675
 out_err:
	mutex_unlock(&sdata->local->sta_mtx);
	/* ignore frame -- wait for timeout */
}

2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731
#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
2732

2733 2734
static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
2735
{
2736
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2737
	u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2738

2739
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2740

2741
	if (len < 24 + 2)
2742
		return;
2743

2744 2745 2746
	if (ifmgd->associated &&
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
		const u8 *bssid = ifmgd->associated->bssid;
2747

2748 2749 2750
		sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
			   bssid, reason_code,
			   ieee80211_get_reason_code_string(reason_code));
2751

2752
		ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2753

2754 2755 2756 2757
		ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
					    reason_code);
		return;
	}
2758

2759 2760 2761
	if (ifmgd->assoc_data &&
	    ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
		const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2762

2763 2764 2765 2766 2767 2768 2769 2770 2771 2772
		sdata_info(sdata,
			   "deauthenticated from %pM while associating (Reason: %u=%s)\n",
			   bssid, reason_code,
			   ieee80211_get_reason_code_string(reason_code));

		ieee80211_destroy_assoc_data(sdata, false);

		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
		return;
	}
2773 2774 2775
}


2776 2777
static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_mgmt *mgmt, size_t len)
2778
{
2779
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2780 2781
	u16 reason_code;

2782
	sdata_assert_lock(sdata);
2783

J
Johannes Berg 已提交
2784
	if (len < 24 + 2)
2785
		return;
2786

J
Johannes Berg 已提交
2787
	if (!ifmgd->associated ||
2788
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2789
		return;
2790 2791 2792

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

J
Johannes Berg 已提交
2793 2794
	sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
		   mgmt->sa, reason_code);
2795

2796 2797
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2798
	ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2799 2800
}

2801 2802 2803 2804
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,
2805 2806
				int *min_rate, int *min_rate_index,
				int shift, u32 rate_flags)
2807 2808 2809 2810
{
	int i, j;

	for (i = 0; i < supp_rates_len; i++) {
2811
		int rate = supp_rates[i] & 0x7f;
2812 2813
		bool is_basic = !!(supp_rates[i] & 0x80);

2814
		if ((rate * 5 * (1 << shift)) > 110)
2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829
			*have_higher_than_11mbit = true;

		/*
		 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
		 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
		 *
		 * Note: Even through the membership selector and the basic
		 *	 rate flag share the same bit, they are not exactly
		 *	 the same.
		 */
		if (!!(supp_rates[i] & 0x80) &&
		    (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
			continue;

		for (j = 0; j < sband->n_bitrates; j++) {
2830 2831 2832 2833 2834 2835 2836 2837 2838
			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) {
2839 2840 2841
				*rates |= BIT(j);
				if (is_basic)
					*basic_rates |= BIT(j);
2842 2843
				if ((rate * 5) < *min_rate) {
					*min_rate = rate * 5;
2844 2845 2846 2847 2848 2849 2850
					*min_rate_index = j;
				}
				break;
			}
		}
	}
}
2851

J
Johannes Berg 已提交
2852 2853
static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
				    struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
2854
				    struct ieee80211_mgmt *mgmt, size_t len)
2855
{
2856
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2857
	struct ieee80211_local *local = sdata->local;
2858
	struct ieee80211_supported_band *sband;
2859
	struct sta_info *sta;
J
Johannes Berg 已提交
2860 2861
	u8 *pos;
	u16 capab_info, aid;
2862
	struct ieee802_11_elems elems;
J
Johannes Berg 已提交
2863
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2864 2865
	const struct cfg80211_bss_ies *bss_ies = NULL;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
J
Johannes Berg 已提交
2866
	u32 changed = 0;
2867
	int err;
2868
	bool ret;
2869

J
Johannes Berg 已提交
2870
	/* AssocResp and ReassocResp have identical structure */
2871 2872

	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
J
Johannes Berg 已提交
2873
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2874

2875
	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
J
Johannes Berg 已提交
2876 2877
		sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
			   aid);
2878 2879
	aid &= ~(BIT(15) | BIT(14));

2880 2881 2882
	ifmgd->broken_ap = false;

	if (aid == 0 || aid > IEEE80211_MAX_AID) {
J
Johannes Berg 已提交
2883 2884
		sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
			   aid);
2885 2886 2887 2888
		aid = 0;
		ifmgd->broken_ap = true;
	}

J
Johannes Berg 已提交
2889
	pos = mgmt->u.assoc_resp.variable;
2890
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2891

2892
	if (!elems.supp_rates) {
J
Johannes Berg 已提交
2893
		sdata_info(sdata, "no SuppRates element in AssocResp\n");
J
Johannes Berg 已提交
2894
		return false;
2895 2896
	}

2897
	ifmgd->aid = aid;
2898 2899 2900
	ifmgd->tdls_chan_switch_prohibited =
		elems.ext_capab && elems.ext_capab_len >= 5 &&
		(elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2901

2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964
	/*
	 * 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");
		}
	}

2965 2966 2967 2968 2969 2970 2971
	/*
	 * 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,
2972 2973 2974
			   "HT AP is missing WMM params or HT capability/operation\n");
		ret = false;
		goto out;
2975 2976 2977 2978 2979
	}

	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    (!elems.vht_cap_elem || !elems.vht_operation)) {
		sdata_info(sdata,
2980 2981 2982
			   "VHT AP is missing VHT capability/operation\n");
		ret = false;
		goto out;
2983 2984
	}

2985 2986 2987 2988 2989
	mutex_lock(&sdata->local->sta_mtx);
	/*
	 * station info was already allocated and inserted before
	 * the association and should be available to us
	 */
2990
	sta = sta_info_get(sdata, cbss->bssid);
2991 2992
	if (WARN_ON(!sta)) {
		mutex_unlock(&sdata->local->sta_mtx);
2993 2994
		ret = false;
		goto out;
2995
	}
2996

J
Johannes Berg 已提交
2997
	sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2998

2999
	/* Set up internal HT/VHT capabilities */
3000
	if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
B
Ben Greear 已提交
3001
		ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3002
						  elems.ht_cap_elem, sta);
3003

M
Mahesh Palivela 已提交
3004 3005
	if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
		ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3006
						    elems.vht_cap_elem, sta);
M
Mahesh Palivela 已提交
3007

3008 3009 3010 3011 3012 3013
	/*
	 * 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.
	 */
3014

3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029
	/*
	 * 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;
	}

3030
	rate_control_rate_init(sta);
3031

3032
	if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
J
Johannes Berg 已提交
3033
		set_sta_flag(sta, WLAN_STA_MFP);
3034 3035 3036 3037
		sta->sta.mfp = true;
	} else {
		sta->sta.mfp = false;
	}
3038

3039
	sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3040

3041
	err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3042 3043 3044
	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
3045 3046 3047
		sdata_info(sdata,
			   "failed to move station %pM to desired state\n",
			   sta->sta.addr);
3048 3049
		WARN_ON(__sta_info_destroy(sta));
		mutex_unlock(&sdata->local->sta_mtx);
3050 3051
		ret = false;
		goto out;
3052 3053
	}

3054
	mutex_unlock(&sdata->local->sta_mtx);
3055

3056 3057 3058 3059 3060 3061 3062 3063
	/*
	 * 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;

3064
	if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3065
		ieee80211_set_wmm_default(sdata, false, false);
3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078
	} 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;
	}
3079
	changed |= BSS_CHANGED_QOS;
3080

J
Johannes Berg 已提交
3081 3082 3083 3084
	/* set AID and assoc capability,
	 * ieee80211_set_associated() will tell the driver */
	bss_conf->aid = aid;
	bss_conf->assoc_capability = capab_info;
3085
	ieee80211_set_associated(sdata, cbss, changed);
3086

3087 3088 3089 3090 3091 3092 3093
	/*
	 * 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);

3094
	/*
J
Johannes Berg 已提交
3095 3096
	 * Start timer to probe the connection to the AP now.
	 * Also start the timer that will detect beacon loss.
3097
	 */
J
Johannes Berg 已提交
3098
	ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3099
	ieee80211_sta_reset_beacon_monitor(sdata);
3100

3101 3102 3103 3104
	ret = true;
 out:
	kfree(bss_ies);
	return ret;
3105 3106
}

3107 3108 3109
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
3110 3111 3112 3113 3114
{
	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;
3115
	int ac, uapsd_queues = -1;
J
Johannes Berg 已提交
3116 3117
	u8 *pos;
	bool reassoc;
3118
	struct cfg80211_bss *bss;
3119 3120 3121 3122
	struct ieee80211_event event = {
		.type = MLME_EVENT,
		.u.mlme.data = ASSOC_EVENT,
	};
J
Johannes Berg 已提交
3123

3124
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3125 3126

	if (!assoc_data)
3127
		return;
3128
	if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3129
		return;
J
Johannes Berg 已提交
3130 3131 3132 3133 3134 3135 3136

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

	if (len < 24 + 6)
3137
		return;
J
Johannes Berg 已提交
3138 3139 3140 3141 3142 3143

	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
3144 3145 3146 3147
	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
3148 3149

	pos = mgmt->u.assoc_resp.variable;
3150
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
3151 3152

	if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3153 3154
	    elems.timeout_int &&
	    elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
J
Johannes Berg 已提交
3155
		u32 tu, ms;
3156
		tu = le32_to_cpu(elems.timeout_int->value);
J
Johannes Berg 已提交
3157
		ms = tu * 1024 / 1000;
J
Johannes Berg 已提交
3158 3159 3160
		sdata_info(sdata,
			   "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
			   mgmt->sa, tu, ms);
J
Johannes Berg 已提交
3161
		assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3162
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
3163
		if (ms > IEEE80211_ASSOC_TIMEOUT)
3164 3165
			run_again(sdata, assoc_data->timeout);
		return;
J
Johannes Berg 已提交
3166 3167
	}

3168
	bss = assoc_data->bss;
J
Johannes Berg 已提交
3169 3170

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
3171 3172
		sdata_info(sdata, "%pM denied association (code=%d)\n",
			   mgmt->sa, status_code);
J
Johannes Berg 已提交
3173
		ieee80211_destroy_assoc_data(sdata, false);
3174 3175 3176
		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
3177
	} else {
3178
		if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
J
Johannes Berg 已提交
3179
			/* oops -- internal error -- send timeout for now */
3180
			ieee80211_destroy_assoc_data(sdata, false);
3181
			cfg80211_assoc_timeout(sdata->dev, bss);
3182
			return;
J
Johannes Berg 已提交
3183
		}
3184 3185
		event.u.mlme.status = MLME_SUCCESS;
		drv_event_callback(sdata->local, sdata, &event);
3186
		sdata_info(sdata, "associated\n");
3187 3188 3189 3190 3191 3192 3193

		/*
		 * destroy assoc_data afterwards, as otherwise an idle
		 * recalc after assoc_data is NULL but before associated
		 * is set can cause the interface to go idle
		 */
		ieee80211_destroy_assoc_data(sdata, true);
3194 3195 3196 3197 3198

		/* get uapsd queues configuration */
		uapsd_queues = 0;
		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
			if (sdata->tx_conf[ac].uapsd)
3199
				uapsd_queues |= ieee80211_ac_to_qos_mask[ac];
J
Johannes Berg 已提交
3200 3201
	}

3202
	cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
J
Johannes Berg 已提交
3203
}
J
Johannes Berg 已提交
3204

3205
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
3206
				  struct ieee80211_mgmt *mgmt, size_t len,
3207
				  struct ieee80211_rx_status *rx_status,
3208
				  struct ieee802_11_elems *elems)
3209 3210
{
	struct ieee80211_local *local = sdata->local;
3211
	struct ieee80211_bss *bss;
3212
	struct ieee80211_channel *channel;
3213

3214
	sdata_assert_lock(sdata);
3215

3216 3217
	channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
	if (!channel)
3218 3219 3220
		return;

	bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3221
					channel);
3222 3223
	if (bss) {
		sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3224
		ieee80211_rx_bss_put(local, bss);
3225
	}
3226 3227 3228
}


3229
static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
3230
					 struct sk_buff *skb)
3231
{
J
Johannes Berg 已提交
3232
	struct ieee80211_mgmt *mgmt = (void *)skb->data;
3233
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
3234 3235
	struct ieee80211_rx_status *rx_status = (void *) skb->cb;
	size_t baselen, len = skb->len;
3236 3237
	struct ieee802_11_elems elems;

3238 3239
	ifmgd = &sdata->u.mgd;

3240
	sdata_assert_lock(sdata);
3241

3242
	if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3243 3244
		return; /* ignore ProbeResp to foreign address */

3245 3246 3247 3248 3249
	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
	if (baselen > len)
		return;

	ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3250
			       false, &elems);
3251

3252
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3253

3254
	if (ifmgd->associated &&
3255
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3256
		ieee80211_reset_ap_probe(sdata);
3257 3258
}

3259 3260 3261
/*
 * This is the canonical list of information elements we care about,
 * the filter code also gives us all changes to the Microsoft OUI
3262 3263 3264
 * (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.
3265 3266 3267 3268 3269 3270 3271 3272 3273 3274
 *
 * 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 =
3275 3276 3277 3278 3279
	(1ULL << WLAN_EID_COUNTRY) |
	(1ULL << WLAN_EID_ERP_INFO) |
	(1ULL << WLAN_EID_CHANNEL_SWITCH) |
	(1ULL << WLAN_EID_PWR_CONSTRAINT) |
	(1ULL << WLAN_EID_HT_CAPABILITY) |
3280 3281
	(1ULL << WLAN_EID_HT_OPERATION) |
	(1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3282

3283 3284 3285
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)
3286
{
3287
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3288
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3289 3290
	size_t baselen;
	struct ieee802_11_elems elems;
3291
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
3292 3293
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
3294
	struct sta_info *sta;
3295
	u32 changed = 0;
3296
	bool erp_valid;
J
Johannes Berg 已提交
3297
	u8 erp_value = 0;
3298
	u32 ncrc;
3299
	u8 *bssid;
3300
	u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3301

3302
	sdata_assert_lock(sdata);
3303

3304 3305 3306
	/* Process beacon from the current BSS */
	baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
	if (baselen > len)
3307
		return;
3308

J
Johannes Berg 已提交
3309 3310 3311 3312
	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		rcu_read_unlock();
3313
		return;
J
Johannes Berg 已提交
3314 3315
	}

3316
	if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
J
Johannes Berg 已提交
3317
		rcu_read_unlock();
3318
		return;
J
Johannes Berg 已提交
3319
	}
3320
	chan = chanctx_conf->def.chan;
J
Johannes Berg 已提交
3321
	rcu_read_unlock();
3322

3323
	if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3324
	    ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
J
Johannes Berg 已提交
3325
		ieee802_11_parse_elems(mgmt->u.beacon.variable,
3326
				       len - baselen, false, &elems);
3327

3328
		ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3329 3330 3331 3332
		if (elems.tim && !elems.parse_error) {
			const struct ieee80211_tim_ie *tim_ie = elems.tim;
			ifmgd->dtim_period = tim_ie->dtim_period;
		}
3333
		ifmgd->have_beacon = true;
3334
		ifmgd->assoc_data->need_beacon = false;
3335
		if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3336 3337 3338 3339 3340 3341 3342 3343 3344 3345
			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
3346 3347
		/* continue assoc process */
		ifmgd->assoc_data->timeout = jiffies;
3348
		ifmgd->assoc_data->timeout_started = true;
3349 3350
		run_again(sdata, ifmgd->assoc_data->timeout);
		return;
J
Johannes Berg 已提交
3351
	}
3352

J
Johannes Berg 已提交
3353
	if (!ifmgd->associated ||
3354
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3355
		return;
J
Johannes Berg 已提交
3356
	bssid = ifmgd->associated->bssid;
3357

3358 3359 3360
	/* 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;
3361
		ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3362
		ifmgd->last_cqm_event_signal = 0;
3363
		ifmgd->count_beacon_signal = 1;
3364
		ifmgd->last_ave_beacon_signal = 0;
3365
	} else {
3366
		ifmgd->count_beacon_signal++;
3367
	}
3368

3369 3370
	ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);

3371 3372
	if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3373
		int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3374
		int last_sig = ifmgd->last_ave_beacon_signal;
3375 3376 3377
		struct ieee80211_event event = {
			.type = RSSI_EVENT,
		};
3378 3379 3380 3381 3382 3383 3384 3385

		/*
		 * 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;
3386 3387
			event.u.rssi.data = RSSI_EVENT_HIGH;
			drv_event_callback(local, sdata, &event);
3388 3389 3390 3391
		} else if (sig < ifmgd->rssi_min_thold &&
			   (last_sig >= ifmgd->rssi_max_thold ||
			   last_sig == 0)) {
			ifmgd->last_ave_beacon_signal = sig;
3392 3393
			event.u.rssi.data = RSSI_EVENT_LOW;
			drv_event_callback(local, sdata, &event);
3394 3395 3396
		}
	}

3397
	if (bss_conf->cqm_rssi_thold &&
3398
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3399
	    !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3400
		int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3401 3402 3403
		int last_event = ifmgd->last_cqm_event_signal;
		int thold = bss_conf->cqm_rssi_thold;
		int hyst = bss_conf->cqm_rssi_hyst;
3404

3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421
		if (sig < thold &&
		    (last_event == 0 || sig < last_event - hyst)) {
			ifmgd->last_cqm_event_signal = sig;
			ieee80211_cqm_rssi_notify(
				&sdata->vif,
				NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
				GFP_KERNEL);
		} else if (sig > thold &&
			   (last_event == 0 || sig > last_event + hyst)) {
			ifmgd->last_cqm_event_signal = sig;
			ieee80211_cqm_rssi_notify(
				&sdata->vif,
				NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
				GFP_KERNEL);
		}
	}

3422
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
J
Johannes Berg 已提交
3423
		mlme_dbg_ratelimited(sdata,
3424
				     "cancelling AP probe due to a received beacon\n");
3425
		ieee80211_reset_ap_probe(sdata);
3426 3427
	}

J
Johannes Berg 已提交
3428 3429 3430 3431
	/*
	 * Push the beacon loss detection into the future since
	 * we are processing a beacon from the AP just now.
	 */
3432
	ieee80211_sta_reset_beacon_monitor(sdata);
J
Johannes Berg 已提交
3433

3434 3435
	ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
	ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3436
					  len - baselen, false, &elems,
3437 3438
					  care_about_ies, ncrc);

3439 3440 3441 3442 3443 3444 3445
	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);
3446
			}
3447
			ieee80211_send_nullfunc(local, sdata, false);
3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459
		} 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);
3460 3461
		}
	}
J
Johannes Berg 已提交
3462

3463 3464
	if (sdata->vif.p2p ||
	    sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
J
Janusz Dziedzic 已提交
3465
		struct ieee80211_p2p_noa_attr noa = {};
3466 3467 3468 3469 3470
		int ret;

		ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
					    len - baselen,
					    IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3471
					    (u8 *) &noa, sizeof(noa));
J
Janusz Dziedzic 已提交
3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487
		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));
3488 3489 3490 3491 3492
			changed |= BSS_CHANGED_P2P_PS;
			ifmgd->beacon_crc_valid = false;
		}
	}

3493 3494 3495
	if (ifmgd->csa_waiting_bcn)
		ieee80211_chswitch_post_beacon(sdata);

3496 3497 3498 3499 3500 3501 3502 3503
	/*
	 * 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.
	 */
3504
	if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515
		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;
	}

3516
	if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3517
		return;
3518
	ifmgd->beacon_crc = ncrc;
3519
	ifmgd->beacon_crc_valid = true;
3520

3521
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3522

3523
	ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3524
					 rx_status->device_timestamp,
3525 3526
					 &elems, true);

3527 3528
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
	    ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3529 3530 3531
				     elems.wmm_param_len))
		changed |= BSS_CHANGED_QOS;

3532 3533
	/*
	 * If we haven't had a beacon before, tell the driver about the
3534
	 * DTIM period (and beacon timing if desired) now.
3535
	 */
3536
	if (!ifmgd->have_beacon) {
3537 3538 3539 3540 3541
		/* 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;
3542

3543 3544
		changed |= BSS_CHANGED_BEACON_INFO;
		ifmgd->have_beacon = true;
3545 3546

		mutex_lock(&local->iflist_mtx);
J
Johannes Berg 已提交
3547
		ieee80211_recalc_ps(local);
3548 3549
		mutex_unlock(&local->iflist_mtx);

3550
		ieee80211_recalc_ps_vif(sdata);
3551 3552
	}

3553
	if (elems.erp_info) {
J
Johannes Berg 已提交
3554 3555 3556 3557
		erp_valid = true;
		erp_value = elems.erp_info[0];
	} else {
		erp_valid = false;
3558
	}
J
Johannes Berg 已提交
3559 3560 3561
	changed |= ieee80211_handle_bss_capability(sdata,
			le16_to_cpu(mgmt->u.beacon.capab_info),
			erp_valid, erp_value);
3562

3563
	mutex_lock(&local->sta_mtx);
3564 3565
	sta = sta_info_get(sdata, bssid);

3566 3567
	if (ieee80211_config_bw(sdata, sta,
				elems.ht_cap_elem, elems.ht_operation,
3568 3569
				elems.vht_operation, bssid, &changed)) {
		mutex_unlock(&local->sta_mtx);
3570 3571 3572
		sdata_info(sdata,
			   "failed to follow AP %pM bandwidth change, disconnect\n",
			   bssid);
3573 3574 3575
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_DEAUTH_LEAVING,
				       true, deauth_buf);
3576 3577 3578
		ieee80211_report_disconnect(sdata, deauth_buf,
					    sizeof(deauth_buf), true,
					    WLAN_REASON_DEAUTH_LEAVING);
3579
		return;
3580
	}
3581 3582 3583

	if (sta && elems.opmode_notif)
		ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3584
					    rx_status->band);
3585
	mutex_unlock(&local->sta_mtx);
3586

3587 3588 3589
	changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
					       elems.country_elem,
					       elems.country_elem_len,
3590 3591
					       elems.pwr_constr_elem,
					       elems.cisco_dtpc_elem);
3592

3593
	ieee80211_bss_info_change_notify(sdata, changed);
3594 3595
}

3596 3597
void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
				  struct sk_buff *skb)
3598 3599 3600 3601
{
	struct ieee80211_rx_status *rx_status;
	struct ieee80211_mgmt *mgmt;
	u16 fc;
3602 3603
	struct ieee802_11_elems elems;
	int ies_len;
3604 3605 3606 3607 3608

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

3609
	sdata_lock(sdata);
3610

J
Johannes Berg 已提交
3611 3612
	switch (fc & IEEE80211_FCTL_STYPE) {
	case IEEE80211_STYPE_BEACON:
3613
		ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
J
Johannes Berg 已提交
3614 3615 3616 3617 3618
		break;
	case IEEE80211_STYPE_PROBE_RESP:
		ieee80211_rx_mgmt_probe_resp(sdata, skb);
		break;
	case IEEE80211_STYPE_AUTH:
3619
		ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3620 3621
		break;
	case IEEE80211_STYPE_DEAUTH:
3622
		ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3623 3624
		break;
	case IEEE80211_STYPE_DISASSOC:
3625
		ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3626 3627 3628
		break;
	case IEEE80211_STYPE_ASSOC_RESP:
	case IEEE80211_STYPE_REASSOC_RESP:
3629
		ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3630 3631
		break;
	case IEEE80211_STYPE_ACTION:
3632
		if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3633 3634 3635
			ies_len = skb->len -
				  offsetof(struct ieee80211_mgmt,
					   u.action.u.chan_switch.variable);
3636 3637 3638 3639 3640 3641

			if (ies_len < 0)
				break;

			ieee802_11_parse_elems(
				mgmt->u.action.u.chan_switch.variable,
3642
				ies_len, true, &elems);
3643 3644 3645 3646

			if (elems.parse_error)
				break;

3647
			ieee80211_sta_process_chanswitch(sdata,
3648 3649 3650
						 rx_status->mactime,
						 rx_status->device_timestamp,
						 &elems, false);
3651 3652 3653 3654 3655 3656 3657 3658 3659 3660
		} 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,
3661
				ies_len, true, &elems);
3662 3663 3664 3665 3666 3667 3668 3669

			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
3670
			ieee80211_sta_process_chanswitch(sdata,
3671 3672 3673
						 rx_status->mactime,
						 rx_status->device_timestamp,
						 &elems, false);
3674
		}
3675
		break;
3676
	}
3677
	sdata_unlock(sdata);
3678 3679
}

J
Johannes Berg 已提交
3680
static void ieee80211_sta_timer(unsigned long data)
3681
{
J
Johannes Berg 已提交
3682 3683
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
3684

3685
	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3686 3687
}

3688
static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3689
					  u8 *bssid, u8 reason, bool tx)
3690
{
3691
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3692

3693
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3694
			       tx, frame_buf);
3695

3696 3697
	ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
				    reason);
3698 3699
}

3700
static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
3701 3702 3703 3704
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3705
	u32 tx_flags = 0;
3706 3707
	u16 trans = 1;
	u16 status = 0;
J
Johannes Berg 已提交
3708

3709
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3710 3711 3712 3713 3714 3715 3716

	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
3717 3718
		sdata_info(sdata, "authentication with %pM timed out\n",
			   auth_data->bss->bssid);
J
Johannes Berg 已提交
3719 3720 3721 3722 3723 3724 3725 3726 3727 3728

		/*
		 * 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
3729 3730
	drv_mgd_prepare_tx(local, sdata);

3731 3732 3733
	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
3734

3735
	auth_data->expected_transaction = 2;
3736

3737 3738 3739 3740 3741
	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
3742

3743 3744 3745
	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
3746

3747 3748 3749 3750 3751
	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
3752

3753
	if (tx_flags == 0) {
3754
		auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3755
		auth_data->timeout_started = true;
3756
		run_again(sdata, auth_data->timeout);
3757
	} else {
3758 3759 3760 3761
		auth_data->timeout =
			round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
		auth_data->timeout_started = true;
		run_again(sdata, auth_data->timeout);
3762
	}
J
Johannes Berg 已提交
3763 3764 3765 3766 3767 3768 3769 3770 3771

	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;

3772
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3773 3774 3775

	assoc_data->tries++;
	if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
J
Johannes Berg 已提交
3776 3777
		sdata_info(sdata, "association with %pM timed out\n",
			   assoc_data->bss->bssid);
J
Johannes Berg 已提交
3778 3779 3780 3781 3782 3783 3784 3785 3786 3787

		/*
		 * 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
3788 3789 3790
	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
3791 3792
	ieee80211_send_assoc(sdata);

3793
	if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3794
		assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3795
		assoc_data->timeout_started = true;
3796
		run_again(sdata, assoc_data->timeout);
3797
	} else {
3798 3799 3800 3801 3802
		assoc_data->timeout =
			round_jiffies_up(jiffies +
					 IEEE80211_ASSOC_TIMEOUT_LONG);
		assoc_data->timeout_started = true;
		run_again(sdata, assoc_data->timeout);
3803
	}
J
Johannes Berg 已提交
3804 3805 3806 3807

	return 0;
}

3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819
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);
}

3820
void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
3821 3822
{
	struct ieee80211_local *local = sdata->local;
3823
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3824

3825
	sdata_lock(sdata);
3826

3827 3828 3829 3830 3831
	if (ifmgd->status_received) {
		__le16 fc = ifmgd->status_fc;
		bool status_acked = ifmgd->status_acked;

		ifmgd->status_received = false;
3832
		if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3833 3834 3835
			if (status_acked) {
				ifmgd->auth_data->timeout =
					jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3836
				run_again(sdata, ifmgd->auth_data->timeout);
3837 3838 3839
			} else {
				ifmgd->auth_data->timeout = jiffies - 1;
			}
3840
			ifmgd->auth_data->timeout_started = true;
3841 3842 3843 3844 3845 3846
		} 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;
3847
				run_again(sdata, ifmgd->assoc_data->timeout);
3848 3849 3850
			} else {
				ifmgd->assoc_data->timeout = jiffies - 1;
			}
3851
			ifmgd->assoc_data->timeout_started = true;
3852 3853 3854
		}
	}

3855
	if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
J
Johannes Berg 已提交
3856 3857 3858 3859 3860 3861 3862
	    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);
3863
		} else if (ieee80211_auth(sdata)) {
J
Johannes Berg 已提交
3864
			u8 bssid[ETH_ALEN];
3865 3866 3867 3868 3869
			struct ieee80211_event event = {
				.type = MLME_EVENT,
				.u.mlme.data = AUTH_EVENT,
				.u.mlme.status = MLME_TIMEOUT,
			};
J
Johannes Berg 已提交
3870 3871 3872 3873 3874

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

			ieee80211_destroy_auth_data(sdata, false);

3875
			cfg80211_auth_timeout(sdata->dev, bssid);
3876
			drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
3877
		}
3878
	} else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3879
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
3880

3881
	if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
J
Johannes Berg 已提交
3882
	    time_after(jiffies, ifmgd->assoc_data->timeout)) {
3883
		if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
J
Johannes Berg 已提交
3884
		    ieee80211_do_assoc(sdata)) {
3885
			struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3886 3887 3888 3889 3890
			struct ieee80211_event event = {
				.type = MLME_EVENT,
				.u.mlme.data = ASSOC_EVENT,
				.u.mlme.status = MLME_TIMEOUT,
			};
J
Johannes Berg 已提交
3891 3892

			ieee80211_destroy_assoc_data(sdata, false);
3893
			cfg80211_assoc_timeout(sdata->dev, bss);
3894
			drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
3895
		}
3896
	} else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3897
		run_again(sdata, ifmgd->assoc_data->timeout);
J
Johannes Berg 已提交
3898

3899
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
J
Johannes Berg 已提交
3900
	    ifmgd->associated) {
3901
		u8 bssid[ETH_ALEN];
3902
		int max_tries;
3903

3904
		memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3905

3906
		if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3907
			max_tries = max_nullfunc_tries;
3908
		else
3909
			max_tries = max_probe_tries;
3910

3911 3912 3913
		/* ACK received for nullfunc probing frame */
		if (!ifmgd->probe_send_count)
			ieee80211_reset_ap_probe(sdata);
3914 3915
		else if (ifmgd->nullfunc_failed) {
			if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3916 3917 3918 3919
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
					 bssid, ifmgd->probe_send_count,
					 max_tries);
3920 3921
				ieee80211_mgd_probe_ap_send(sdata);
			} else {
J
Johannes Berg 已提交
3922 3923 3924
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
					 bssid);
3925
				ieee80211_sta_connection_lost(sdata, bssid,
3926 3927
					WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
					false);
3928 3929
			}
		} else if (time_is_after_jiffies(ifmgd->probe_timeout))
3930
			run_again(sdata, ifmgd->probe_timeout);
3931
		else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
J
Johannes Berg 已提交
3932 3933 3934
			mlme_dbg(sdata,
				 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
				 bssid, probe_wait_ms);
3935
			ieee80211_sta_connection_lost(sdata, bssid,
3936
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3937
		} else if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3938 3939 3940 3941
			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);
3942 3943
			ieee80211_mgd_probe_ap_send(sdata);
		} else {
J
Johannes Berg 已提交
3944 3945 3946 3947
			/*
			 * We actually lost the connection ... or did we?
			 * Let's make sure!
			 */
3948 3949 3950
			mlme_dbg(sdata,
				 "No probe response from AP %pM after %dms, disconnecting.\n",
				 bssid, probe_wait_ms);
3951

3952
			ieee80211_sta_connection_lost(sdata, bssid,
3953
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
J
Johannes Berg 已提交
3954 3955 3956
		}
	}

3957
	sdata_unlock(sdata);
3958 3959
}

J
Johannes Berg 已提交
3960 3961 3962 3963
static void ieee80211_sta_bcn_mon_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
3964
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3965

3966
	if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
M
Michal Kazior 已提交
3967 3968
		return;

3969
	sdata->u.mgd.connection_loss = false;
3970 3971
	ieee80211_queue_work(&sdata->local->hw,
			     &sdata->u.mgd.beacon_connection_loss_work);
J
Johannes Berg 已提交
3972 3973 3974 3975 3976 3977 3978 3979 3980
}

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;

3981
	if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
M
Michal Kazior 已提交
3982 3983
		return;

3984
	ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
J
Johannes Berg 已提交
3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995
}

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
3996 3997
static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
3998
	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3999
		__ieee80211_stop_poll(sdata);
4000

J
Johannes Berg 已提交
4001
		/* let's probe the connection once */
4002
		if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4003 4004
			ieee80211_queue_work(&sdata->local->hw,
					     &sdata->u.mgd.monitor_work);
4005
	}
J
Johannes Berg 已提交
4006
}
4007

4008
#ifdef CONFIG_PM
4009 4010 4011 4012 4013 4014 4015
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);

4016 4017 4018 4019 4020
	if (ifmgd->auth_data || ifmgd->assoc_data) {
		const u8 *bssid = ifmgd->auth_data ?
				ifmgd->auth_data->bss->bssid :
				ifmgd->assoc_data->bss->bssid;

4021
		/*
4022 4023 4024
		 * 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.
4025
		 */
4026
		ieee80211_send_deauth_disassoc(sdata, bssid,
4027 4028 4029
					       IEEE80211_STYPE_DEAUTH,
					       WLAN_REASON_DEAUTH_LEAVING,
					       false, frame_buf);
4030 4031 4032 4033
		if (ifmgd->assoc_data)
			ieee80211_destroy_assoc_data(sdata, false);
		if (ifmgd->auth_data)
			ieee80211_destroy_auth_data(sdata, false);
4034 4035 4036 4037
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
	}

4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065
	/* 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);
	}

4066 4067 4068
	sdata_unlock(sdata);
}

4069 4070 4071 4072
void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

4073
	sdata_lock(sdata);
4074
	if (!ifmgd->associated) {
4075
		sdata_unlock(sdata);
4076 4077 4078 4079 4080 4081 4082 4083 4084 4085
		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);
4086
		sdata_unlock(sdata);
4087 4088
		return;
	}
4089
	sdata_unlock(sdata);
4090 4091 4092
}
#endif

J
Johannes Berg 已提交
4093 4094
/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4095
{
4096
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
4097

4098
	ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
4099
	INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4100
	INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4101 4102
	INIT_WORK(&ifmgd->beacon_connection_loss_work,
		  ieee80211_beacon_connection_loss_work);
4103 4104
	INIT_WORK(&ifmgd->csa_connection_drop_work,
		  ieee80211_csa_connection_drop_work);
4105
	INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4106 4107
	INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
			  ieee80211_tdls_peer_del_work);
4108
	setup_timer(&ifmgd->timer, ieee80211_sta_timer,
S
Sujith 已提交
4109
		    (unsigned long) sdata);
J
Johannes Berg 已提交
4110 4111 4112 4113
	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);
4114
	setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
J
Johannes Berg 已提交
4115
		    (unsigned long) sdata);
4116 4117
	INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
			  ieee80211_sta_handle_tspec_ac_params_wk);
J
Johannes Berg 已提交
4118

4119
	ifmgd->flags = 0;
4120
	ifmgd->powersave = sdata->wdev.ps;
4121 4122
	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
4123
	ifmgd->p2p_noa_index = -1;
J
Johannes Berg 已提交
4124

4125
	if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4126 4127 4128
		ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
	else
		ifmgd->req_smps = IEEE80211_SMPS_OFF;
4129 4130 4131 4132 4133

	/* Setup TDLS data */
	spin_lock_init(&ifmgd->teardown_lock);
	ifmgd->teardown_skb = NULL;
	ifmgd->orig_teardown_skb = NULL;
4134 4135
}

4136 4137
/* scan finished notification */
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
J
Johannes Berg 已提交
4138
{
4139
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
4140

4141 4142
	/* Restart STA timers */
	rcu_read_lock();
4143 4144 4145 4146
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (ieee80211_sdata_running(sdata))
			ieee80211_restart_sta_timer(sdata);
	}
4147 4148
	rcu_read_unlock();
}
J
Johannes Berg 已提交
4149

J
Johannes Berg 已提交
4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160 4161
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;

4162
	ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
J
Johannes Berg 已提交
4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174
	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;

4175
	vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
J
Johannes Berg 已提交
4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193
	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;
}

4194 4195
static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
				  struct cfg80211_bss *cbss)
4196 4197 4198
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4199
	const struct ieee80211_ht_cap *ht_cap = NULL;
4200
	const struct ieee80211_ht_operation *ht_oper = NULL;
J
Johannes Berg 已提交
4201
	const struct ieee80211_vht_operation *vht_oper = NULL;
4202
	struct ieee80211_supported_band *sband;
4203
	struct cfg80211_chan_def chandef;
J
Johannes Berg 已提交
4204
	int ret;
4205 4206
	u32 i;
	bool have_80mhz;
4207

4208 4209
	sband = local->hw.wiphy->bands[cbss->channel->band];

J
Johannes Berg 已提交
4210 4211 4212 4213
	ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
			  IEEE80211_STA_DISABLE_80P80MHZ |
			  IEEE80211_STA_DISABLE_160MHZ);

4214 4215
	rcu_read_lock();

J
Johannes Berg 已提交
4216 4217
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	    sband->ht_cap.ht_supported) {
4218
		const u8 *ht_oper_ie, *ht_cap_ie;
4219

4220
		ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4221 4222
		if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
			ht_oper = (void *)(ht_oper_ie + 2);
4223

4224 4225 4226 4227 4228
		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) {
4229 4230 4231
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ht_oper = NULL;
		}
4232 4233
	}

J
Johannes Berg 已提交
4234 4235
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    sband->vht_cap.vht_supported) {
4236
		const u8 *vht_oper_ie, *vht_cap;
J
Johannes Berg 已提交
4237

4238 4239
		vht_oper_ie = ieee80211_bss_get_ie(cbss,
						   WLAN_EID_VHT_OPERATION);
J
Johannes Berg 已提交
4240 4241 4242 4243
		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
4244
			sdata_info(sdata,
J
Johannes Berg 已提交
4245
				   "AP advertised VHT without HT, disabling both\n");
4246 4247
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4248
		}
4249 4250 4251 4252 4253 4254

		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;
		}
4255 4256
	}

4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268 4269 4270
	/* 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
4271 4272
	ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
						     cbss->channel,
4273
						     ht_cap, ht_oper, vht_oper,
4274
						     &chandef, false);
4275

J
Johannes Berg 已提交
4276 4277
	sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
				      local->rx_chains);
4278

4279 4280
	rcu_read_unlock();

4281 4282 4283
	/* will change later if needed */
	sdata->smps_mode = IEEE80211_SMPS_OFF;

4284
	mutex_lock(&local->mtx);
J
Johannes Berg 已提交
4285 4286 4287 4288 4289 4290 4291
	/*
	 * 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);
4292 4293 4294 4295

	/* don't downgrade for 5 and 10 MHz channels, though. */
	if (chandef.width == NL80211_CHAN_WIDTH_5 ||
	    chandef.width == NL80211_CHAN_WIDTH_10)
4296
		goto out;
4297

4298
	while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4299
		ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4300 4301 4302
		ret = ieee80211_vif_use_channel(sdata, &chandef,
						IEEE80211_CHANCTX_SHARED);
	}
4303 4304
 out:
	mutex_unlock(&local->mtx);
J
Johannes Berg 已提交
4305
	return ret;
4306 4307 4308
}

static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4309 4310
				     struct cfg80211_bss *cbss, bool assoc,
				     bool override)
4311 4312 4313 4314 4315
{
	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;
4316
	struct ieee80211_supported_band *sband;
4317
	bool have_sta = false;
4318 4319
	int err;

4320 4321
	sband = local->hw.wiphy->bands[cbss->channel->band];

4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335
	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;
	}
4336

4337
	if (new_sta || override) {
4338 4339 4340 4341 4342 4343 4344 4345
		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
4346
	if (new_sta) {
4347 4348 4349
		u32 rates = 0, basic_rates = 0;
		bool have_higher_than_11mbit;
		int min_rate = INT_MAX, min_rate_index = -1;
4350
		struct ieee80211_chanctx_conf *chanctx_conf;
J
Johannes Berg 已提交
4351
		const struct cfg80211_bss_ies *ies;
4352
		int shift = ieee80211_vif_get_shift(&sdata->vif);
4353
		u32 rate_flags;
4354

4355 4356 4357 4358
		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
4359
			sta_info_free(local, new_sta);
4360 4361 4362 4363
			return -EINVAL;
		}
		rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
		rcu_read_unlock();
4364 4365 4366 4367 4368

		ieee80211_get_rates(sband, bss->supp_rates,
				    bss->supp_rates_len,
				    &rates, &basic_rates,
				    &have_higher_than_11mbit,
4369 4370
				    &min_rate, &min_rate_index,
				    shift, rate_flags);
4371 4372 4373 4374 4375 4376 4377 4378 4379 4380

		/*
		 * 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
4381 4382
			sdata_info(sdata,
				   "No basic rates, using min rate instead\n");
4383 4384 4385
			basic_rates = BIT(min_rate_index);
		}

J
Johannes Berg 已提交
4386
		new_sta->sta.supp_rates[cbss->channel->band] = rates;
4387 4388 4389
		sdata->vif.bss_conf.basic_rates = basic_rates;

		/* cf. IEEE 802.11 9.2.12 */
4390
		if (cbss->channel->band == NL80211_BAND_2GHZ &&
4391 4392 4393 4394 4395 4396 4397
		    have_higher_than_11mbit)
			sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
		else
			sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

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

4398 4399
		/* set timing information */
		sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
J
Johannes Berg 已提交
4400
		rcu_read_lock();
4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413
		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;
4414 4415
		} else if (!ieee80211_hw_check(&sdata->local->hw,
					       TIMING_BEACON_ONLY)) {
4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426
			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
4427
		rcu_read_unlock();
4428 4429

		/* tell driver about BSSID, basic rates and timing */
4430
		ieee80211_bss_info_change_notify(sdata,
4431 4432
			BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
			BSS_CHANGED_BEACON_INT);
4433 4434

		if (assoc)
J
Johannes Berg 已提交
4435
			sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4436

J
Johannes Berg 已提交
4437 4438
		err = sta_info_insert(new_sta);
		new_sta = NULL;
4439
		if (err) {
J
Johannes Berg 已提交
4440 4441 4442
			sdata_info(sdata,
				   "failed to insert STA entry for the AP (error %d)\n",
				   err);
4443 4444 4445
			return err;
		}
	} else
4446
		WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4447

4448 4449 4450 4451
	/* Cancel scan to ensure that nothing interferes with connection */
	if (local->scanning)
		ieee80211_scan_cancel(local);

4452 4453 4454
	return 0;
}

4455 4456 4457
/* config hooks */
int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
		       struct cfg80211_auth_request *req)
J
Johannes Berg 已提交
4458
{
J
Johannes Berg 已提交
4459 4460 4461
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data;
4462
	u16 auth_alg;
J
Johannes Berg 已提交
4463 4464 4465
	int err;

	/* prepare auth data structure */
J
Johannes Berg 已提交
4466

4467 4468 4469 4470 4471
	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
4472
		if (IS_ERR(local->wep_tx_tfm))
4473
			return -EOPNOTSUPP;
4474 4475 4476 4477 4478 4479 4480 4481
		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;
4482 4483 4484
	case NL80211_AUTHTYPE_SAE:
		auth_alg = WLAN_AUTH_SAE;
		break;
4485 4486 4487 4488 4489 4490 4491 4492 4493
	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;
4494 4495
	default:
		return -EOPNOTSUPP;
J
Johannes Berg 已提交
4496
	}
4497

4498
	auth_data = kzalloc(sizeof(*auth_data) + req->auth_data_len +
4499
			    req->ie_len, GFP_KERNEL);
J
Johannes Berg 已提交
4500
	if (!auth_data)
J
Johannes Berg 已提交
4501
		return -ENOMEM;
4502

J
Johannes Berg 已提交
4503
	auth_data->bss = req->bss;
4504

4505
	if (req->auth_data_len >= 4) {
4506 4507 4508 4509 4510 4511
		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]);
		}
4512 4513 4514
		memcpy(auth_data->data, req->auth_data + 4,
		       req->auth_data_len - 4);
		auth_data->data_len += req->auth_data_len - 4;
4515 4516
	}

4517
	if (req->ie && req->ie_len) {
4518 4519 4520
		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
4521
	}
4522

J
Johannes Berg 已提交
4523
	if (req->key && req->key_len) {
J
Johannes Berg 已提交
4524 4525 4526
		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
4527 4528
	}

J
Johannes Berg 已提交
4529
	auth_data->algorithm = auth_alg;
J
Johannes Berg 已提交
4530

J
Johannes Berg 已提交
4531
	/* try to authenticate/probe */
4532

J
Johannes Berg 已提交
4533 4534 4535 4536
	if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
	    ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
4537 4538
	}

J
Johannes Berg 已提交
4539 4540
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
4541

J
Johannes Berg 已提交
4542 4543
	/* prep auth_data so we don't go into idle on disassoc */
	ifmgd->auth_data = auth_data;
J
Johannes Berg 已提交
4544

4545 4546 4547
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

4548 4549 4550
		sdata_info(sdata,
			   "disconnect from AP %pM for new auth to %pM\n",
			   ifmgd->associated->bssid, req->bss->bssid);
4551 4552 4553 4554
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_UNSPECIFIED,
				       false, frame_buf);

4555 4556 4557
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    WLAN_REASON_UNSPECIFIED);
4558
	}
J
Johannes Berg 已提交
4559

J
Johannes Berg 已提交
4560
	sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4561

4562
	err = ieee80211_prep_connection(sdata, req->bss, false, false);
4563
	if (err)
J
Johannes Berg 已提交
4564
		goto err_clear;
J
Johannes Berg 已提交
4565

4566
	err = ieee80211_auth(sdata);
J
Johannes Berg 已提交
4567 4568 4569 4570 4571 4572
	if (err) {
		sta_info_destroy_addr(sdata, req->bss->bssid);
		goto err_clear;
	}

	/* hold our own reference */
4573
	cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4574
	return 0;
J
Johannes Berg 已提交
4575 4576

 err_clear:
4577
	eth_zero_addr(ifmgd->bssid);
4578
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4579
	ifmgd->auth_data = NULL;
4580 4581 4582
	mutex_lock(&sdata->local->mtx);
	ieee80211_vif_release_channel(sdata);
	mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
4583 4584 4585
 err_free:
	kfree(auth_data);
	return err;
J
Johannes Berg 已提交
4586 4587
}

4588 4589
int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
			struct cfg80211_assoc_request *req)
4590
{
J
Johannes Berg 已提交
4591
	struct ieee80211_local *local = sdata->local;
4592
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4593
	struct ieee80211_bss *bss = (void *)req->bss->priv;
J
Johannes Berg 已提交
4594
	struct ieee80211_mgd_assoc_data *assoc_data;
4595
	const struct cfg80211_bss_ies *beacon_ies;
J
Johannes Berg 已提交
4596
	struct ieee80211_supported_band *sband;
4597
	const u8 *ssidie, *ht_ie, *vht_ie;
4598
	int i, err;
4599
	bool override = false;
4600

J
Johannes Berg 已提交
4601 4602 4603 4604
	assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
	if (!assoc_data)
		return -ENOMEM;

4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615
	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();

4616 4617 4618
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

4619 4620 4621
		sdata_info(sdata,
			   "disconnect from AP %pM for new assoc to %pM\n",
			   ifmgd->associated->bssid, req->bss->bssid);
4622 4623 4624 4625
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_UNSPECIFIED,
				       false, frame_buf);

4626 4627 4628
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    WLAN_REASON_UNSPECIFIED);
4629
	}
J
Johannes Berg 已提交
4630 4631 4632 4633

	if (ifmgd->auth_data && !ifmgd->auth_data->done) {
		err = -EBUSY;
		goto err_free;
J
Johannes Berg 已提交
4634
	}
4635

J
Johannes Berg 已提交
4636 4637 4638 4639
	if (ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
	}
4640

J
Johannes Berg 已提交
4641 4642 4643 4644
	if (ifmgd->auth_data) {
		bool match;

		/* keep sta info, bssid if matching */
4645
		match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
J
Johannes Berg 已提交
4646
		ieee80211_destroy_auth_data(sdata, match);
4647 4648
	}

J
Johannes Berg 已提交
4649
	/* prepare assoc data */
4650

4651 4652
	ifmgd->beacon_crc_valid = false;

4653 4654 4655
	assoc_data->wmm = bss->wmm_used &&
			  (local->hw.queues >= IEEE80211_NUM_ACS);

J
Johannes Berg 已提交
4656 4657 4658 4659 4660 4661 4662
	/*
	 * 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.
	 */
4663
	for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4664 4665
		if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4666
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4667
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4668
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4669
			netdev_info(sdata->dev,
4670
				    "disabling HT/VHT due to WEP/TKIP use\n");
4671 4672
		}
	}
4673

J
Johannes Berg 已提交
4674 4675 4676
	/* 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 ||
4677 4678
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4679
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4680 4681
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4682 4683
			netdev_info(sdata->dev,
				    "disabling HT as WMM/QoS is not supported by the AP\n");
4684
	}
J
Johannes Berg 已提交
4685

4686 4687
	/* disable VHT if we don't support it or the AP doesn't use WMM */
	if (!sband->vht_cap.vht_supported ||
4688 4689
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4690
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4691 4692
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4693 4694
			netdev_info(sdata->dev,
				    "disabling VHT as WMM/QoS is not supported by the AP\n");
4695 4696
	}

B
Ben Greear 已提交
4697 4698 4699 4700
	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));

4701 4702 4703 4704
	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));

4705
	if (req->ie && req->ie_len) {
J
Johannes Berg 已提交
4706 4707 4708
		memcpy(assoc_data->ie, req->ie, req->ie_len);
		assoc_data->ie_len = req->ie_len;
	}
4709

J
Johannes Berg 已提交
4710
	assoc_data->bss = req->bss;
4711

J
Johannes Berg 已提交
4712 4713
	if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
		if (ifmgd->powersave)
4714
			sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
J
Johannes Berg 已提交
4715
		else
4716
			sdata->smps_mode = IEEE80211_SMPS_OFF;
J
Johannes Berg 已提交
4717
	} else
4718
		sdata->smps_mode = ifmgd->req_smps;
J
Johannes Berg 已提交
4719

J
Johannes Berg 已提交
4720 4721 4722
	assoc_data->capability = req->bss->capability;
	assoc_data->supp_rates = bss->supp_rates;
	assoc_data->supp_rates_len = bss->supp_rates_len;
4723

4724
	rcu_read_lock();
4725 4726 4727 4728 4729
	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
4730
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4731 4732 4733 4734 4735 4736
	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;
4737
	rcu_read_unlock();
4738

4739
	if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4740
		 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4741 4742 4743
	     "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
		sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;

K
Kalle Valo 已提交
4744
	if (bss->wmm_used && bss->uapsd_supported &&
4745
	    (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4746
		assoc_data->uapsd = true;
K
Kalle Valo 已提交
4747 4748
		ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
	} else {
4749
		assoc_data->uapsd = false;
K
Kalle Valo 已提交
4750 4751 4752
		ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
	}

4753
	if (req->prev_bssid)
J
Johannes Berg 已提交
4754
		memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4755 4756 4757 4758 4759 4760 4761 4762 4763

	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;
	}

4764 4765 4766 4767 4768
	if (req->flags & ASSOC_REQ_USE_RRM)
		ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
	else
		ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;

4769 4770 4771 4772 4773
	if (req->crypto.control_port)
		ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
	else
		ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;

4774 4775
	sdata->control_port_protocol = req->crypto.control_port_ethertype;
	sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4776 4777
	sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
							sdata->vif.type);
4778

J
Johannes Berg 已提交
4779 4780 4781
	/* kick off associate process */

	ifmgd->assoc_data = assoc_data;
4782
	ifmgd->dtim_period = 0;
4783
	ifmgd->have_beacon = false;
J
Johannes Berg 已提交
4784

4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799 4800 4801 4802 4803 4804 4805 4806 4807 4808 4809 4810 4811 4812 4813 4814
	/* 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);
4815 4816
	if (err)
		goto err_clear;
J
Johannes Berg 已提交
4817

4818 4819
	rcu_read_lock();
	beacon_ies = rcu_dereference(req->bss->beacon_ies);
4820

4821
	if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4822 4823 4824 4825 4826 4827 4828 4829
	    !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);
4830
		assoc_data->timeout_started = true;
4831 4832 4833 4834 4835
		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);
4836 4837
		u8 dtim_count = 0;

4838 4839 4840 4841
		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;
4842
			dtim_count = tim->dtim_count;
4843
		}
4844
		ifmgd->have_beacon = true;
J
Johannes Berg 已提交
4845
		assoc_data->timeout = jiffies;
4846
		assoc_data->timeout_started = true;
4847

4848
		if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4849 4850 4851 4852 4853
			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;
		}
4854 4855
	} else {
		assoc_data->timeout = jiffies;
4856
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
4857
	}
4858 4859
	rcu_read_unlock();

4860
	run_again(sdata, assoc_data->timeout);
J
Johannes Berg 已提交
4861

P
Paul Stewart 已提交
4862 4863 4864 4865 4866 4867 4868 4869 4870 4871
	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
4872 4873
		sdata_info(sdata, "associating with AP with corrupt %s\n",
			   corrupt_type);
P
Paul Stewart 已提交
4874 4875
	}

4876
	return 0;
J
Johannes Berg 已提交
4877
 err_clear:
4878
	eth_zero_addr(ifmgd->bssid);
4879
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4880 4881 4882 4883
	ifmgd->assoc_data = NULL;
 err_free:
	kfree(assoc_data);
	return err;
4884 4885
}

4886
int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4887
			 struct cfg80211_deauth_request *req)
4888
{
4889
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4890
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4891
	bool tx = !req->local_state_change;
4892

4893 4894 4895 4896 4897 4898
	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));
4899

4900
		drv_mgd_prepare_tx(sdata->local, sdata);
4901 4902
		ieee80211_send_deauth_disassoc(sdata, req->bssid,
					       IEEE80211_STYPE_DEAUTH,
4903
					       req->reason_code, tx,
4904
					       frame_buf);
4905
		ieee80211_destroy_auth_data(sdata, false);
4906 4907 4908
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    req->reason_code);
4909

4910
		return 0;
4911 4912
	}

4913 4914 4915 4916 4917 4918 4919 4920 4921 4922 4923 4924 4925 4926 4927 4928 4929 4930 4931
	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);
		ieee80211_destroy_assoc_data(sdata, false);
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    req->reason_code);
		return 0;
	}

4932 4933
	if (ifmgd->associated &&
	    ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4934 4935 4936 4937 4938
		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));

4939 4940
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       req->reason_code, tx, frame_buf);
4941 4942 4943
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    req->reason_code);
4944 4945
		return 0;
	}
4946

4947
	return -ENOTCONN;
4948
}
4949

4950
int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4951
			   struct cfg80211_disassoc_request *req)
J
Johannes Berg 已提交
4952
{
4953
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4954
	u8 bssid[ETH_ALEN];
4955
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
J
Johannes Berg 已提交
4956

J
Johannes Berg 已提交
4957 4958 4959 4960 4961 4962
	/*
	 * 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.
	 */
4963
	if (ifmgd->associated != req->bss)
4964 4965
		return -ENOLINK;

J
Johannes Berg 已提交
4966
	sdata_info(sdata,
4967 4968
		   "disassociating from %pM by local choice (Reason: %u=%s)\n",
		   req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4969

4970
	memcpy(bssid, req->bss->bssid, ETH_ALEN);
4971 4972 4973
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
			       req->reason_code, !req->local_state_change,
			       frame_buf);
4974

4975 4976
	ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
				    req->reason_code);
4977

4978 4979
	return 0;
}
4980

4981
void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4982 4983 4984
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

4985 4986 4987 4988 4989 4990 4991 4992 4993 4994
	/*
	 * 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);
4995
	cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4996

4997
	sdata_lock(sdata);
4998 4999
	if (ifmgd->assoc_data) {
		struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5000
		ieee80211_destroy_assoc_data(sdata, false);
5001 5002
		cfg80211_assoc_timeout(sdata->dev, bss);
	}
5003 5004
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
5005 5006 5007 5008 5009 5010 5011
	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);
5012
	del_timer_sync(&ifmgd->timer);
5013
	sdata_unlock(sdata);
5014 5015
}

5016 5017 5018 5019 5020 5021
void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
			       enum nl80211_cqm_rssi_threshold_event rssi_event,
			       gfp_t gfp)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

J
Johannes Berg 已提交
5022 5023
	trace_api_cqm_rssi_notify(sdata, rssi_event);

5024 5025 5026
	cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
}
EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5027 5028 5029 5030 5031 5032 5033 5034 5035 5036

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);