mlme.c 144.8 KB
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/*
 * BSS client mode implementation
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 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
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 * Copyright 2004, Instant802 Networks, Inc.
 * Copyright 2005, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
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 * Copyright 2013-2014  Intel Mobile Communications GmbH
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 * 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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#include "fils_aead.h"
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#define IEEE80211_AUTH_TIMEOUT		(HZ / 5)
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#define IEEE80211_AUTH_TIMEOUT_LONG	(HZ / 2)
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#define IEEE80211_AUTH_TIMEOUT_SHORT	(HZ / 10)
#define IEEE80211_AUTH_MAX_TRIES	3
#define IEEE80211_AUTH_WAIT_ASSOC	(HZ * 5)
#define IEEE80211_ASSOC_TIMEOUT		(HZ / 5)
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#define IEEE80211_ASSOC_TIMEOUT_LONG	(HZ / 2)
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#define IEEE80211_ASSOC_TIMEOUT_SHORT	(HZ / 10)
#define IEEE80211_ASSOC_MAX_TRIES	3
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static int max_nullfunc_tries = 2;
module_param(max_nullfunc_tries, int, 0644);
MODULE_PARM_DESC(max_nullfunc_tries,
		 "Maximum nullfunc tx tries before disconnecting (reason 4).");

static int max_probe_tries = 5;
module_param(max_probe_tries, int, 0644);
MODULE_PARM_DESC(max_probe_tries,
		 "Maximum probe tries before disconnecting (reason 4).");
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/*
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 * Beacon loss timeout is calculated as N frames times the
 * advertised beacon interval.  This may need to be somewhat
 * higher than what hardware might detect to account for
 * delays in the host processing frames. But since we also
 * probe on beacon miss before declaring the connection lost
 * default to what we want.
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 */
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static int beacon_loss_count = 7;
module_param(beacon_loss_count, int, 0644);
MODULE_PARM_DESC(beacon_loss_count,
		 "Number of beacon intervals before we decide beacon was lost.");
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/*
 * Time the connection can be idle before we probe
 * it to see if we can still talk to the AP.
 */
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#define IEEE80211_CONNECTION_IDLE_TIME	(30 * HZ)
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/*
 * Time we wait for a probe response after sending
 * a probe request because of beacon loss or for
 * checking the connection still works.
 */
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static int probe_wait_ms = 500;
module_param(probe_wait_ms, int, 0644);
MODULE_PARM_DESC(probe_wait_ms,
		 "Maximum time(ms) to wait for probe response"
		 " before disconnecting (reason 4).");
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/*
 * How many Beacon frames need to have been used in average signal strength
 * before starting to indicate signal change events.
 */
#define IEEE80211_SIGNAL_AVE_MIN_COUNT	4

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

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

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

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

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

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

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

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	mod_timer(&ifmgd->conn_mon_timer,
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		  round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
}

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

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static u32
ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
			     struct ieee80211_supported_band *sband,
			     struct ieee80211_channel *channel,
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			     const struct ieee80211_ht_cap *ht_cap,
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			     const struct ieee80211_ht_operation *ht_oper,
			     const struct ieee80211_vht_operation *vht_oper,
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			     struct cfg80211_chan_def *chandef, bool tracking)
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{
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	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
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	struct cfg80211_chan_def vht_chandef;
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	struct ieee80211_sta_ht_cap sta_ht_cap;
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	u32 ht_cfreq, ret;

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

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

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

	chandef->width = NL80211_CHAN_WIDTH_20;

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

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

	/* check 40 MHz support, if we have it */
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	if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
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		ieee80211_chandef_ht_oper(ht_oper, chandef);
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	} else {
		/* 40 MHz (and 80 MHz) must be supported for VHT */
		ret = IEEE80211_STA_DISABLE_VHT;
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		/* also mark 40 MHz disabled */
		ret |= IEEE80211_STA_DISABLE_40MHZ;
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		goto out;
	}

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

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	vht_chandef = *chandef;
	if (!ieee80211_chandef_vht_oper(vht_oper, &vht_chandef)) {
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		if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
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			sdata_info(sdata,
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				   "AP VHT information is invalid, disable VHT\n");
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		ret = IEEE80211_STA_DISABLE_VHT;
		goto out;
	}

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

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

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

	*chandef = vht_chandef;

	ret = 0;

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

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

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

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		ret |= ieee80211_chandef_downgrade(chandef);
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	}

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

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

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

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

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

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

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

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

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

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

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/* frame sending functions */

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

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

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

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

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

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

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

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

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/* This function determines vht capability flags for the association
 * and builds the IE.
 * Note - the function may set the owner of the MU-MIMO capability
 */
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static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
				 struct sk_buff *skb,
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				 struct ieee80211_supported_band *sband,
				 struct ieee80211_vht_cap *ap_vht_cap)
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{
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	struct ieee80211_local *local = sdata->local;
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	u8 *pos;
	u32 cap;
	struct ieee80211_sta_vht_cap vht_cap;
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	u32 mask, ap_bf_sts, our_bf_sts;
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	BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));

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

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	if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
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		u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;

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

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

540 541 542 543 544 545
	/*
	 * Some APs apparently get confused if our capabilities are better
	 * than theirs, so restrict what we advertise in the assoc request.
	 */
	if (!(ap_vht_cap->vht_cap_info &
			cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563
		cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
			 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
	else if (!(ap_vht_cap->vht_cap_info &
			cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
		cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;

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

		list_for_each_entry_rcu(other, &local->interfaces, list) {
564
			if (other->vif.mu_mimo_owner) {
565 566 567 568 569 570 571
				disable_mu_mimo = true;
				break;
			}
		}
		if (disable_mu_mimo)
			cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
		else
572
			sdata->vif.mu_mimo_owner = true;
573
	}
574

575 576 577 578 579 580 581 582 583 584
	mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;

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

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

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

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static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u8 *pos, qos_info;
	size_t offset = 0, noffset;
599
	int i, count, rates_len, supp_rates_len, shift;
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	u16 capab;
	struct ieee80211_supported_band *sband;
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	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
604
	u32 rate_flags, rates = 0;
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605

606
	sdata_assert_lock(sdata);
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607

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	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (WARN_ON(!chanctx_conf)) {
		rcu_read_unlock();
		return;
	}
614
	chan = chanctx_conf->def.chan;
615
	rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
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	rcu_read_unlock();
	sband = local->hw.wiphy->bands[chan->band];
618
	shift = ieee80211_vif_get_shift(&sdata->vif);
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	if (assoc_data->supp_rates_len) {
		/*
		 * Get all rates supported by the device and the AP as
		 * some APs don't like getting a superset of their rates
		 * in the association request (e.g. D-Link DAP 1353 in
		 * b-only mode)...
		 */
627 628 629 630
		rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
						     assoc_data->supp_rates,
						     assoc_data->supp_rates_len,
						     &rates);
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	} else {
		/*
		 * In case AP not provide any supported rates information
		 * before association, we send information element(s) with
		 * all rates that we support.
		 */
637 638 639 640 641 642 643 644
		rates_len = 0;
		for (i = 0; i < sband->n_bitrates; i++) {
			if ((rate_flags & sband->bitrates[i].flags)
			    != rate_flags)
				continue;
			rates |= BIT(i);
			rates_len++;
		}
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	}

	skb = alloc_skb(local->hw.extra_tx_headroom +
			sizeof(*mgmt) + /* bit too much but doesn't matter */
			2 + assoc_data->ssid_len + /* SSID */
			4 + rates_len + /* (extended) rates */
			4 + /* power capability */
			2 + 2 * sband->n_channels + /* supported channels */
			2 + sizeof(struct ieee80211_ht_cap) + /* HT */
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			2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
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			assoc_data->ie_len + /* extra IEs */
656
			(assoc_data->fils_kek_len ? 16 /* AES-SIV */ : 0) +
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			9, /* WMM */
			GFP_KERNEL);
	if (!skb)
		return;

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

	capab = WLAN_CAPABILITY_ESS;

666
	if (sband->band == NL80211_BAND_2GHZ) {
667 668
		capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
		capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
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	}

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

	if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
675
	    ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
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		capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;

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

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

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

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

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

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

	count = 0;
	for (i = 0; i < sband->n_bitrates; i++) {
		if (BIT(i) & rates) {
723 724 725
			int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
						5 * (1 << shift));
			*pos++ = (u8) rate;
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			if (++count == 8)
				break;
		}
	}

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

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

746 747
	if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
	    capab & WLAN_CAPABILITY_RADIO_MEASURE) {
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		pos = skb_put(skb, 4);
		*pos++ = WLAN_EID_PWR_CAPABILITY;
		*pos++ = 2;
		*pos++ = 0; /* min tx power */
752 753
		 /* max tx power */
		*pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
754
	}
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756
	if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
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		/* TODO: get this in reg domain format */
		pos = skb_put(skb, 2 * sband->n_channels + 2);
		*pos++ = WLAN_EID_SUPPORTED_CHANNELS;
		*pos++ = 2 * sband->n_channels;
		for (i = 0; i < sband->n_channels; i++) {
			*pos++ = ieee80211_frequency_to_channel(
					sband->channels[i].center_freq);
			*pos++ = 1; /* one channel in the subband*/
		}
	}

	/* if present, add any custom IEs that go before HT */
769
	if (assoc_data->ie_len) {
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		static const u8 before_ht[] = {
			WLAN_EID_SSID,
			WLAN_EID_SUPP_RATES,
			WLAN_EID_EXT_SUPP_RATES,
			WLAN_EID_PWR_CAPABILITY,
			WLAN_EID_SUPPORTED_CHANNELS,
			WLAN_EID_RSN,
			WLAN_EID_QOS_CAPA,
			WLAN_EID_RRM_ENABLED_CAPABILITIES,
			WLAN_EID_MOBILITY_DOMAIN,
780 781
			WLAN_EID_FAST_BSS_TRANSITION,	/* reassoc only */
			WLAN_EID_RIC_DATA,		/* reassoc only */
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			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
		};
784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803
		static const u8 after_ric[] = {
			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
			WLAN_EID_HT_CAPABILITY,
			WLAN_EID_BSS_COEX_2040,
			WLAN_EID_EXT_CAPABILITY,
			WLAN_EID_QOS_TRAFFIC_CAPA,
			WLAN_EID_TIM_BCAST_REQ,
			WLAN_EID_INTERWORKING,
			/* 60GHz doesn't happen right now */
			WLAN_EID_VHT_CAPABILITY,
			WLAN_EID_OPMODE_NOTIF,
		};

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

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

813
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
814
		ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
815
				    sband, chan, sdata->smps_mode);
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817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836
	/* if present, add any custom IEs that go before VHT */
	if (assoc_data->ie_len) {
		static const u8 before_vht[] = {
			WLAN_EID_SSID,
			WLAN_EID_SUPP_RATES,
			WLAN_EID_EXT_SUPP_RATES,
			WLAN_EID_PWR_CAPABILITY,
			WLAN_EID_SUPPORTED_CHANNELS,
			WLAN_EID_RSN,
			WLAN_EID_QOS_CAPA,
			WLAN_EID_RRM_ENABLED_CAPABILITIES,
			WLAN_EID_MOBILITY_DOMAIN,
			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
			WLAN_EID_HT_CAPABILITY,
			WLAN_EID_BSS_COEX_2040,
			WLAN_EID_EXT_CAPABILITY,
			WLAN_EID_QOS_TRAFFIC_CAPA,
			WLAN_EID_TIM_BCAST_REQ,
			WLAN_EID_INTERWORKING,
		};
837 838

		/* RIC already taken above, so no need to handle here anymore */
839 840 841 842 843 844 845 846
		noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
					     before_vht, ARRAY_SIZE(before_vht),
					     offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
		offset = noffset;
	}

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

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851
	/* if present, add any custom non-vendor IEs that go after HT */
852
	if (assoc_data->ie_len) {
J
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853 854 855 856 857 858 859 860
		noffset = ieee80211_ie_split_vendor(assoc_data->ie,
						    assoc_data->ie_len,
						    offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
		offset = noffset;
	}

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

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

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

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

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886 887
	drv_mgd_prepare_tx(local, sdata);

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

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

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

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

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

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

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

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

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

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

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

937
	ieee80211_tx_skb(sdata, skb);
938 939
}

940 941 942 943 944 945 946 947 948 949 950
static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
					  struct ieee80211_sub_if_data *sdata)
{
	struct sk_buff *skb;
	struct ieee80211_hdr *nullfunc;
	__le16 fc;

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

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
951
	if (!skb)
952
		return;
953

954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969
	skb_reserve(skb, local->hw.extra_tx_headroom);

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

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

970 971 972 973 974
/* spectrum management related things */
static void ieee80211_chswitch_work(struct work_struct *work)
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
975
	struct ieee80211_local *local = sdata->local;
976
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
977
	int ret;
978

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

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

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

989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022
	if (!sdata->vif.csa_active)
		goto out;

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

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

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

		goto out;
	}

	if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
					&sdata->csa_chandef)) {
1023
		sdata_info(sdata,
1024
			   "failed to finalize channel switch, disconnecting\n");
1025 1026 1027 1028
		ieee80211_queue_work(&sdata->local->hw,
				     &ifmgd->csa_connection_drop_work);
		goto out;
	}
1029

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

1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052
	ifmgd->csa_waiting_bcn = true;

	ieee80211_sta_reset_beacon_monitor(sdata);
	ieee80211_sta_reset_conn_monitor(sdata);

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

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

	sdata_assert_lock(sdata);

	WARN_ON(!sdata->vif.csa_active);
1053

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

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

1063 1064 1065 1066 1067 1068
	ret = drv_post_channel_switch(sdata);
	if (ret) {
		sdata_info(sdata,
			   "driver post channel switch failed, disconnecting\n");
		ieee80211_queue_work(&local->hw,
				     &ifmgd->csa_connection_drop_work);
1069
		return;
1070
	}
1071 1072

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

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

	trace_api_chswitch_done(sdata, success);
	if (!success) {
1082 1083 1084 1085 1086 1087
		sdata_info(sdata,
			   "driver channel switch failed, disconnecting\n");
		ieee80211_queue_work(&sdata->local->hw,
				     &ifmgd->csa_connection_drop_work);
	} else {
		ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1088 1089 1090 1091
	}
}
EXPORT_SYMBOL(ieee80211_chswitch_done);

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

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

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

1116
	sdata_assert_lock(sdata);
1117

1118
	if (!cbss)
1119 1120
		return;

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

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

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

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

1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162
	if (cfg80211_chandef_identical(&csa_ie.chandef,
				       &sdata->vif.bss_conf.chandef)) {
		if (ifmgd->csa_ignored_same_chan)
			return;
		sdata_info(sdata,
			   "AP %pM tries to chanswitch to same channel, ignore\n",
			   ifmgd->associated->bssid);
		ifmgd->csa_ignored_same_chan = true;
		return;
	}

1163 1164 1165 1166 1167 1168 1169 1170
	/*
	 * Drop all TDLS peers - either we disconnect or move to a different
	 * channel from this point on. There's no telling what our peer will do.
	 * The TDLS WIDER_BW scenario is also problematic, as peers might now
	 * have an incompatible wider chandef.
	 */
	ieee80211_teardown_tdls_peers(sdata);

1171
	mutex_lock(&local->mtx);
1172
	mutex_lock(&local->chanctx_mtx);
1173 1174 1175 1176 1177
	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
					 lockdep_is_held(&local->chanctx_mtx));
	if (!conf) {
		sdata_info(sdata,
			   "no channel context assigned to vif?, disconnecting\n");
1178
		goto drop_connection;
1179 1180 1181 1182
	}

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

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

1190 1191 1192 1193 1194 1195 1196 1197 1198
	ch_switch.timestamp = timestamp;
	ch_switch.device_timestamp = device_timestamp;
	ch_switch.block_tx = csa_ie.mode;
	ch_switch.chandef = csa_ie.chandef;
	ch_switch.count = csa_ie.count;

	if (drv_pre_channel_switch(sdata, &ch_switch)) {
		sdata_info(sdata,
			   "preparing for channel switch failed, disconnecting\n");
1199
		goto drop_connection;
1200 1201
	}

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

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

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

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

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

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

1245 1246 1247 1248 1249 1250
static bool
ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
				 struct ieee80211_channel *channel,
				 const u8 *country_ie, u8 country_ie_len,
				 const u8 *pwr_constr_elem,
				 int *chan_pwr, int *pwr_reduction)
1251
{
1252 1253
	struct ieee80211_country_ie_triplet *triplet;
	int chan = ieee80211_frequency_to_channel(channel->center_freq);
1254
	int i, chan_increment;
1255
	bool have_chan_pwr = false;
1256

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

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

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

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

		if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
			goto next;

		for (i = 0; i < triplet->chans.num_channels; i++) {
			if (first_channel + i * chan_increment == chan) {
				have_chan_pwr = true;
1287
				*chan_pwr = triplet->chans.max_power;
1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298
				break;
			}
		}
		if (have_chan_pwr)
			break;

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

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

1304 1305 1306
	return have_chan_pwr;
}

1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320
static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
				      struct ieee80211_channel *channel,
				      const u8 *cisco_dtpc_ie,
				      int *pwr_level)
{
	/* From practical testing, the first data byte of the DTPC element
	 * seems to contain the requested dBm level, and the CLI on Cisco
	 * APs clearly state the range is -127 to 127 dBm, which indicates
	 * a signed byte, although it seemingly never actually goes negative.
	 * The other byte seems to always be zero.
	 */
	*pwr_level = (__s8)cisco_dtpc_ie[4];
}

1321 1322 1323 1324
static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_channel *channel,
				       struct ieee80211_mgmt *mgmt,
				       const u8 *country_ie, u8 country_ie_len,
1325 1326
				       const u8 *pwr_constr_ie,
				       const u8 *cisco_dtpc_ie)
1327
{
1328 1329 1330
	bool has_80211h_pwr = false, has_cisco_pwr = false;
	int chan_pwr = 0, pwr_reduction_80211h = 0;
	int pwr_level_cisco, pwr_level_80211h;
1331
	int new_ap_level;
1332
	__le16 capab = mgmt->u.probe_resp.capab_info;
1333

1334 1335 1336
	if (country_ie &&
	    (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
	     capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1337 1338 1339
		has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
			sdata, channel, country_ie, country_ie_len,
			pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1340 1341 1342 1343 1344 1345 1346 1347
		pwr_level_80211h =
			max_t(int, 0, chan_pwr - pwr_reduction_80211h);
	}

	if (cisco_dtpc_ie) {
		ieee80211_find_cisco_dtpc(
			sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
		has_cisco_pwr = true;
1348
	}
1349

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

1353 1354 1355 1356 1357
	/* If we have both 802.11h and Cisco DTPC, apply both limits
	 * by picking the smallest of the two power levels advertised.
	 */
	if (has_80211h_pwr &&
	    (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1358 1359 1360 1361 1362
		new_ap_level = pwr_level_80211h;

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

1363 1364 1365 1366
		sdata_dbg(sdata,
			  "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
			  pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
			  sdata->u.mgd.bssid);
1367
	} else {  /* has_cisco_pwr is always true here. */
1368 1369 1370 1371 1372
		new_ap_level = pwr_level_cisco;

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

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

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

1384 1385 1386 1387 1388 1389
/* powersave */
static void ieee80211_enable_ps(struct ieee80211_local *local,
				struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_conf *conf = &local->hw.conf;

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

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

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

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

static void ieee80211_change_ps(struct ieee80211_local *local)
{
	struct ieee80211_conf *conf = &local->hw.conf;

	if (local->ps_sdata) {
		ieee80211_enable_ps(local, local->ps_sdata);
	} else if (conf->flags & IEEE80211_CONF_PS) {
		conf->flags &= ~IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
		del_timer_sync(&local->dynamic_ps_timer);
		cancel_work_sync(&local->dynamic_ps_enable_work);
	}
}

1428 1429 1430 1431
static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *mgd = &sdata->u.mgd;
	struct sta_info *sta = NULL;
J
Johannes Berg 已提交
1432
	bool authorized = false;
1433 1434 1435 1436

	if (!mgd->powersave)
		return false;

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

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

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

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

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

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

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

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

	list_for_each_entry(sdata, &local->interfaces, list) {
1471
		if (!ieee80211_sdata_running(sdata))
1472
			continue;
1473 1474 1475 1476 1477 1478 1479 1480
		if (sdata->vif.type == NL80211_IFTYPE_AP) {
			/* If an AP vif is found, then disable PS
			 * by setting the count to zero thereby setting
			 * ps_sdata to NULL.
			 */
			count = 0;
			break;
		}
1481 1482 1483 1484 1485 1486
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

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

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

J
Johannes Berg 已提交
1495 1496 1497 1498 1499 1500
		/* If the TIM IE is invalid, pretend the value is 1 */
		if (!dtimper)
			dtimper = 1;

		local->hw.conf.ps_dtim_period = dtimper;
		local->ps_sdata = found;
1501
	} else {
1502
		local->ps_sdata = NULL;
1503
	}
1504 1505 1506 1507

	ieee80211_change_ps(local);
}

E
Eliad Peller 已提交
1508 1509 1510 1511 1512 1513 1514 1515 1516 1517
void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
{
	bool ps_allowed = ieee80211_powersave_allowed(sdata);

	if (sdata->vif.bss_conf.ps != ps_allowed) {
		sdata->vif.bss_conf.ps = ps_allowed;
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
	}
}

1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529
void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
{
	struct ieee80211_local *local =
		container_of(work, struct ieee80211_local,
			     dynamic_ps_disable_work);

	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
		local->hw.conf.flags &= ~IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
	}

	ieee80211_wake_queues_by_reason(&local->hw,
1530
					IEEE80211_MAX_QUEUE_MAP,
1531 1532
					IEEE80211_QUEUE_STOP_REASON_PS,
					false);
1533 1534 1535 1536 1537 1538 1539 1540
}

void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
{
	struct ieee80211_local *local =
		container_of(work, struct ieee80211_local,
			     dynamic_ps_enable_work);
	struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1541
	struct ieee80211_if_managed *ifmgd;
1542 1543
	unsigned long flags;
	int q;
1544 1545 1546 1547 1548

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

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

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

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

		/*
		 * transmission can be stopped by others which leads to
		 * dynamic_ps_timer expiry. Postpone the ps timer if it
		 * is not the actual idle state.
		 */
		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		for (q = 0; q < local->hw.queues; q++) {
			if (local->queue_stop_reasons[q]) {
				spin_unlock_irqrestore(&local->queue_stop_reason_lock,
						       flags);
				mod_timer(&local->dynamic_ps_timer, jiffies +
					  msecs_to_jiffies(
					  local->hw.conf.dynamic_ps_timeout));
				return;
			}
		}
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1580 1581
	}

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

1595 1596
	if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
	      ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1597 1598 1599 1600 1601
	    (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
		ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
		local->hw.conf.flags |= IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
	}
1602 1603 1604 1605 1606 1607
}

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

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

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

1619 1620 1621 1622 1623 1624 1625 1626
	mutex_lock(&sdata->local->mtx);
	if (sdata->wdev.cac_started) {
		ieee80211_vif_release_channel(sdata);
		cfg80211_cac_event(sdata->dev, &chandef,
				   NL80211_RADAR_CAC_FINISHED,
				   GFP_KERNEL);
	}
	mutex_unlock(&sdata->local->mtx);
1627 1628
}

1629 1630 1631 1632 1633
static bool
__ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1634
	bool ret = false;
1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678
	int ac;

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

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

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

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

		switch (tx_tspec->action) {
		case TX_TSPEC_ACTION_STOP_DOWNGRADE:
			/* take the original parameters */
			if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
				sdata_err(sdata,
					  "failed to set TX queue parameters for queue %d\n",
					  ac);
			tx_tspec->action = TX_TSPEC_ACTION_NONE;
			tx_tspec->downgraded = false;
			ret = true;
			break;
		case TX_TSPEC_ACTION_DOWNGRADE:
			if (time_after(now, tx_tspec->time_slice_start + HZ)) {
				tx_tspec->action = TX_TSPEC_ACTION_NONE;
				ret = true;
				break;
			}
			/* downgrade next lower non-ACM AC */
			for (non_acm_ac = ac + 1;
			     non_acm_ac < IEEE80211_NUM_ACS;
			     non_acm_ac++)
				if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
					break;
1679 1680 1681 1682 1683 1684
			/* Usually the loop will result in using BK even if it
			 * requires admission control, but such a configuration
			 * makes no sense and we have to transmit somehow - the
			 * AC selection does the same thing.
			 * If we started out trying to downgrade from BK, then
			 * the extra condition here might be needed.
1685
			 */
1686 1687
			if (non_acm_ac >= IEEE80211_NUM_ACS)
				non_acm_ac = IEEE80211_AC_BK;
1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721
			if (drv_conf_tx(local, sdata, ac,
					&sdata->tx_conf[non_acm_ac]))
				sdata_err(sdata,
					  "failed to set TX queue parameters for queue %d\n",
					  ac);
			tx_tspec->action = TX_TSPEC_ACTION_NONE;
			ret = true;
			schedule_delayed_work(&ifmgd->tx_tspec_wk,
				tx_tspec->time_slice_start + HZ - now + 1);
			break;
		case TX_TSPEC_ACTION_NONE:
			/* nothing now */
			break;
		}
	}

	return ret;
}

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

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

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

J
Johannes Berg 已提交
1722
/* MLME */
1723
static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1724
				     struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
1725
				     const u8 *wmm_param, size_t wmm_param_len)
1726
{
1727
	struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1728
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1729
	size_t left;
1730
	int count, ac;
J
Johannes Berg 已提交
1731 1732
	const u8 *pos;
	u8 uapsd_queues = 0;
1733

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

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

	if (!wmm_param)
1741
		return false;
1742

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

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

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

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

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

Y
Yoni Divinsky 已提交
1759
	sdata->wmm_acm = 0;
1760 1761 1762
	for (; left >= 4; left -= 4, pos += 4) {
		int aci = (pos[0] >> 5) & 0x03;
		int acm = (pos[0] >> 4) & 0x01;
K
Kalle Valo 已提交
1763
		bool uapsd = false;
1764 1765

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

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

1799
		if (params[ac].aifs < 2) {
1800 1801
			sdata_info(sdata,
				   "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1802 1803
				   params[ac].aifs, aci);
			params[ac].aifs = 2;
1804
		}
1805 1806 1807 1808 1809
		params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
		params[ac].txop = get_unaligned_le16(pos + 2);
		params[ac].acm = acm;
		params[ac].uapsd = uapsd;
K
Kalle Valo 已提交
1810

1811 1812 1813 1814 1815 1816 1817 1818 1819
		if (params[ac].cw_min > params[ac].cw_max) {
			sdata_info(sdata,
				   "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
				   params[ac].cw_min, params[ac].cw_max, aci);
			return false;
		}
	}

	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
J
Johannes Berg 已提交
1820
		mlme_dbg(sdata,
1821 1822 1823 1824 1825 1826 1827 1828
			 "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
			 ac, params[ac].acm,
			 params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
			 params[ac].txop, params[ac].uapsd,
			 ifmgd->tx_tspec[ac].downgraded);
		sdata->tx_conf[ac] = params[ac];
		if (!ifmgd->tx_tspec[ac].downgraded &&
		    drv_conf_tx(local, sdata, ac, &params[ac]))
J
Johannes Berg 已提交
1829
			sdata_err(sdata,
1830 1831
				  "failed to set TX queue parameters for AC %d\n",
				  ac);
1832
	}
1833 1834

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

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

1843
	sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1844 1845 1846 1847 1848 1849 1850 1851 1852 1853
	ieee80211_run_deferred_scan(sdata->local);
}

static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
{
	mutex_lock(&sdata->local->mtx);
	__ieee80211_stop_poll(sdata);
	mutex_unlock(&sdata->local->mtx);
}

J
Johannes Berg 已提交
1854 1855
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
1856
{
J
Johannes Berg 已提交
1857
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1858
	u32 changed = 0;
J
Johannes Berg 已提交
1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871
	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);
1872
	if (ieee80211_get_sdata_band(sdata) == NL80211_BAND_5GHZ)
1873
		use_short_slot = true;
1874

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

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

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

	return changed;
}

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

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

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

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

1911 1912
	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;

1913 1914
	if (sdata->vif.p2p ||
	    sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
1915
		const struct cfg80211_bss_ies *ies;
1916

1917 1918 1919 1920 1921 1922 1923 1924
		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
1925 1926
					(u8 *) &bss_conf->p2p_noa_attr,
					sizeof(bss_conf->p2p_noa_attr));
1927
			if (ret >= 2) {
J
Janusz Dziedzic 已提交
1928 1929
				sdata->u.mgd.p2p_noa_index =
					bss_conf->p2p_noa_attr.index;
1930 1931
				bss_info_changed |= BSS_CHANGED_P2P_PS;
			}
1932
		}
1933
		rcu_read_unlock();
1934 1935
	}

J
Johannes Berg 已提交
1936
	/* just to be sure */
1937
	ieee80211_stop_poll(sdata);
J
Johannes Berg 已提交
1938

1939
	ieee80211_led_assoc(local, 1);
1940

1941
	if (sdata->u.mgd.have_beacon) {
1942 1943 1944 1945 1946 1947 1948
		/*
		 * 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;
1949
		bss_conf->beacon_rate = bss->beacon_rate;
1950
		bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1951
	} else {
1952
		bss_conf->beacon_rate = NULL;
1953
		bss_conf->dtim_period = 0;
1954
	}
1955

1956
	bss_conf->assoc = 1;
1957

1958
	/* Tell the driver to monitor connection quality (if supported) */
1959
	if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1960
	    bss_conf->cqm_rssi_thold)
1961 1962
		bss_info_changed |= BSS_CHANGED_CQM;

1963
	/* Enable ARP filtering */
1964
	if (bss_conf->arp_addr_cnt)
1965 1966
		bss_info_changed |= BSS_CHANGED_ARP_FILTER;

J
Johannes Berg 已提交
1967
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1968

J
Johannes Berg 已提交
1969
	mutex_lock(&local->iflist_mtx);
J
Johannes Berg 已提交
1970
	ieee80211_recalc_ps(local);
J
Johannes Berg 已提交
1971
	mutex_unlock(&local->iflist_mtx);
1972

1973
	ieee80211_recalc_smps(sdata);
E
Eliad Peller 已提交
1974 1975
	ieee80211_recalc_ps_vif(sdata);

1976
	netif_carrier_on(sdata->dev);
1977 1978
}

1979
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1980 1981
				   u16 stype, u16 reason, bool tx,
				   u8 *frame_buf)
1982
{
1983
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1984
	struct ieee80211_local *local = sdata->local;
1985
	u32 changed = 0;
1986

1987
	sdata_assert_lock(sdata);
1988

1989 1990 1991
	if (WARN_ON_ONCE(tx && !frame_buf))
		return;

J
Johannes Berg 已提交
1992 1993 1994
	if (WARN_ON(!ifmgd->associated))
		return;

1995 1996
	ieee80211_stop_poll(sdata);

1997
	ifmgd->associated = NULL;
1998 1999
	netif_carrier_off(sdata->dev);

2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
	/*
	 * 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
2011 2012 2013
	/* disable per-vif ps */
	ieee80211_recalc_ps_vif(sdata);

2014 2015 2016
	/* make sure ongoing transmission finishes */
	synchronize_net();

2017 2018 2019 2020 2021 2022
	/*
	 * 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.
	 */
2023
	if (tx)
2024
		ieee80211_flush_queues(local, sdata, true);
2025

2026 2027
	/* deauthenticate/disassociate now */
	if (tx || frame_buf)
2028 2029
		ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
					       reason, tx, frame_buf);
2030

2031
	/* flush out frame - make sure the deauth was actually sent */
2032
	if (tx)
2033
		ieee80211_flush_queues(local, sdata, false);
2034

2035
	/* clear bssid only after building the needed mgmt frames */
2036
	eth_zero_addr(ifmgd->bssid);
2037

2038
	/* remove AP and TDLS peers */
2039
	sta_info_flush(sdata);
2040 2041

	/* finally reset all BSS / config parameters */
2042 2043 2044
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
J
Johannes Berg 已提交
2045 2046
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
2047

J
Janusz Dziedzic 已提交
2048 2049 2050
	ifmgd->p2p_noa_index = -1;
	memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
	       sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2051

2052
	/* on the next assoc, re-program HT/VHT parameters */
B
Ben Greear 已提交
2053 2054
	memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
	memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2055 2056
	memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
	memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2057 2058 2059 2060 2061 2062 2063

	/* 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;
2064
	sdata->vif.mu_mimo_owner = false;
2065

2066
	sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2067

2068 2069 2070
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

2071
	/* Disable ARP filtering */
2072
	if (sdata->vif.bss_conf.arp_addr_cnt)
2073 2074
		changed |= BSS_CHANGED_ARP_FILTER;

2075 2076 2077
	sdata->vif.bss_conf.qos = false;
	changed |= BSS_CHANGED_QOS;

2078 2079
	/* The BSSID (not really interesting) and HT changed */
	changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
J
Johannes Berg 已提交
2080
	ieee80211_bss_info_change_notify(sdata, changed);
2081

2082
	/* disassociated - set to defaults now */
2083
	ieee80211_set_wmm_default(sdata, false, false);
2084

2085 2086 2087 2088
	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);
2089

2090
	sdata->vif.bss_conf.dtim_period = 0;
2091 2092
	sdata->vif.bss_conf.beacon_rate = NULL;

2093
	ifmgd->have_beacon = false;
2094

2095
	ifmgd->flags = 0;
2096
	mutex_lock(&local->mtx);
2097
	ieee80211_vif_release_channel(sdata);
2098 2099

	sdata->vif.csa_active = false;
2100
	ifmgd->csa_waiting_bcn = false;
2101
	ifmgd->csa_ignored_same_chan = false;
2102 2103 2104 2105 2106
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
2107
	mutex_unlock(&local->mtx);
2108

2109 2110 2111 2112
	/* existing TX TSPEC sessions no longer exist */
	memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
	cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);

2113
	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2114
}
2115

2116 2117 2118 2119 2120 2121 2122 2123
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
2124 2125
	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
2126
	 */
J
Johannes Berg 已提交
2127 2128 2129
	if (is_multicast_ether_addr(hdr->addr1))
		return;

2130
	ieee80211_sta_reset_conn_monitor(sdata);
2131
}
2132

2133 2134 2135
static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2136
	struct ieee80211_local *local = sdata->local;
2137

2138
	mutex_lock(&local->mtx);
2139 2140
	if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
		goto out;
2141

2142
	__ieee80211_stop_poll(sdata);
2143 2144

	mutex_lock(&local->iflist_mtx);
J
Johannes Berg 已提交
2145
	ieee80211_recalc_ps(local);
2146
	mutex_unlock(&local->iflist_mtx);
2147

2148
	if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2149
		goto out;
2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160

	/*
	 * 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));
2161 2162
out:
	mutex_unlock(&local->mtx);
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 2196 2197 2198 2199
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);
	}
}

2200
void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2201
			     struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2202
{
2203 2204
	ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);

F
Felix Fietkau 已提交
2205
	if (!ieee80211_is_data(hdr->frame_control))
2206 2207 2208 2209
	    return;

	if (ieee80211_is_nullfunc(hdr->frame_control) &&
	    sdata->u.mgd.probe_send_count > 0) {
2210
		if (ack)
2211
			ieee80211_sta_reset_conn_monitor(sdata);
2212 2213
		else
			sdata->u.mgd.nullfunc_failed = true;
2214
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2215
		return;
2216
	}
2217 2218 2219

	if (ack)
		ieee80211_sta_reset_conn_monitor(sdata);
2220 2221
}

2222 2223 2224 2225
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ssid;
2226
	u8 *dst = ifmgd->associated->bssid;
2227
	u8 unicast_limit = max(1, max_probe_tries - 3);
J
Johannes Berg 已提交
2228
	struct sta_info *sta;
2229 2230 2231 2232 2233 2234 2235 2236

	/*
	 * 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;
2237

2238 2239 2240 2241 2242 2243 2244
	/*
	 * 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.
	 */
2245 2246
	ifmgd->probe_send_count++;

J
Johannes Berg 已提交
2247 2248 2249 2250 2251 2252 2253 2254
	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);
	}

2255
	if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2256
		ifmgd->nullfunc_failed = false;
2257
		ieee80211_send_nullfunc(sdata->local, sdata, false);
2258
	} else {
2259 2260
		int ssid_len;

2261
		rcu_read_lock();
2262
		ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2263 2264 2265 2266 2267
		if (WARN_ON_ONCE(ssid == NULL))
			ssid_len = 0;
		else
			ssid_len = ssid[1];

2268
		ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2269
					 ssid + 2, ssid_len, NULL,
2270
					 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
2271
					 ifmgd->associated->channel, false);
2272
		rcu_read_unlock();
2273
	}
2274

2275
	ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2276
	run_again(sdata, ifmgd->probe_timeout);
2277 2278
}

J
Johannes Berg 已提交
2279 2280
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
				   bool beacon)
2281 2282
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
2283
	bool already = false;
2284

2285
	if (!ieee80211_sdata_running(sdata))
2286 2287
		return;

2288
	sdata_lock(sdata);
2289 2290 2291 2292

	if (!ifmgd->associated)
		goto out;

2293 2294 2295 2296 2297 2298 2299
	mutex_lock(&sdata->local->mtx);

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

2300
	if (beacon) {
J
Johannes Berg 已提交
2301
		mlme_dbg_ratelimited(sdata,
2302 2303
				     "detected beacon loss from AP (missed %d beacons) - probing\n",
				     beacon_loss_count);
J
Johannes Berg 已提交
2304

2305
		ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2306
	}
2307

J
Johannes Berg 已提交
2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318
	/*
	 * 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!
	 */
2319
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
J
Johannes Berg 已提交
2320 2321
		already = true;

E
Eliad Peller 已提交
2322 2323
	ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;

2324 2325
	mutex_unlock(&sdata->local->mtx);

J
Johannes Berg 已提交
2326 2327 2328
	if (already)
		goto out;

2329
	mutex_lock(&sdata->local->iflist_mtx);
J
Johannes Berg 已提交
2330
	ieee80211_recalc_ps(sdata->local);
2331 2332
	mutex_unlock(&sdata->local->iflist_mtx);

2333 2334
	ifmgd->probe_send_count = 0;
	ieee80211_mgd_probe_ap_send(sdata);
2335
 out:
2336
	sdata_unlock(sdata);
2337 2338
}

2339 2340 2341 2342 2343
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;
2344
	struct cfg80211_bss *cbss;
2345 2346
	struct sk_buff *skb;
	const u8 *ssid;
2347
	int ssid_len;
2348 2349 2350 2351

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

2352
	sdata_assert_lock(sdata);
2353

2354 2355 2356 2357 2358 2359 2360
	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
2361 2362
		return NULL;

2363
	rcu_read_lock();
2364
	ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2365 2366 2367 2368 2369
	if (WARN_ON_ONCE(ssid == NULL))
		ssid_len = 0;
	else
		ssid_len = ssid[1];

2370
	skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
J
Johannes Berg 已提交
2371
					(u32) -1, cbss->channel,
2372
					ssid + 2, ssid_len,
2373
					NULL, 0, true);
2374
	rcu_read_unlock();
2375 2376 2377 2378 2379

	return skb;
}
EXPORT_SYMBOL(ieee80211_ap_probereq_get);

2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397
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);
}

2398
static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2399
{
2400
	struct ieee80211_local *local = sdata->local;
2401
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2402
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2403

2404
	sdata_lock(sdata);
2405
	if (!ifmgd->associated) {
2406
		sdata_unlock(sdata);
2407 2408 2409
		return;
	}

2410 2411 2412 2413 2414
	/* 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);

2415 2416
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
			       WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2417
			       true, frame_buf);
2418
	mutex_lock(&local->mtx);
2419
	sdata->vif.csa_active = false;
2420
	ifmgd->csa_waiting_bcn = false;
2421 2422 2423 2424 2425
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
2426
	mutex_unlock(&local->mtx);
2427

2428 2429 2430
	ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
				    WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);

2431
	sdata_unlock(sdata);
2432 2433
}

2434
static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
J
Johannes Berg 已提交
2435 2436 2437
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
2438
			     u.mgd.beacon_connection_loss_work);
2439 2440
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

2441 2442
	if (ifmgd->associated)
		ifmgd->beacon_loss_count++;
J
Johannes Berg 已提交
2443

2444
	if (ifmgd->connection_loss) {
2445 2446
		sdata_info(sdata, "Connection to AP %pM lost\n",
			   ifmgd->bssid);
2447
		__ieee80211_disconnect(sdata);
2448
	} else {
2449
		ieee80211_mgd_probe_ap(sdata, true);
2450 2451 2452 2453 2454 2455 2456 2457 2458
	}
}

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);

2459
	__ieee80211_disconnect(sdata);
J
Johannes Berg 已提交
2460 2461
}

2462 2463 2464
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2465
	struct ieee80211_hw *hw = &sdata->local->hw;
2466

J
Johannes Berg 已提交
2467 2468
	trace_api_beacon_loss(sdata);

2469
	sdata->u.mgd.connection_loss = false;
2470
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2471 2472 2473
}
EXPORT_SYMBOL(ieee80211_beacon_loss);

2474 2475 2476 2477 2478
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
2479 2480
	trace_api_connection_loss(sdata);

2481
	sdata->u.mgd.connection_loss = true;
2482 2483 2484 2485 2486
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_connection_loss);


J
Johannes Berg 已提交
2487 2488 2489 2490 2491
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;

2492
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2493 2494

	if (!assoc) {
2495 2496 2497 2498 2499 2500
		/*
		 * 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
2501 2502
		sta_info_destroy_addr(sdata, auth_data->bss->bssid);

2503
		eth_zero_addr(sdata->u.mgd.bssid);
J
Johannes Berg 已提交
2504
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2505
		sdata->u.mgd.flags = 0;
2506
		mutex_lock(&sdata->local->mtx);
J
Johannes Berg 已提交
2507
		ieee80211_vif_release_channel(sdata);
2508
		mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
2509 2510
	}

2511
	cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
J
Johannes Berg 已提交
2512 2513 2514 2515
	kfree(auth_data);
	sdata->u.mgd.auth_data = NULL;
}

2516
static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2517
					 bool assoc, bool abandon)
2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534
{
	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;
2535 2536
		sdata->vif.mu_mimo_owner = false;

2537 2538 2539
		mutex_lock(&sdata->local->mtx);
		ieee80211_vif_release_channel(sdata);
		mutex_unlock(&sdata->local->mtx);
2540 2541 2542

		if (abandon)
			cfg80211_abandon_assoc(sdata->dev, assoc_data->bss);
2543 2544 2545 2546 2547 2548
	}

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

J
Johannes Berg 已提交
2549 2550 2551
static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
{
2552
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
2553 2554 2555
	struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
	u8 *pos;
	struct ieee802_11_elems elems;
2556
	u32 tx_flags = 0;
J
Johannes Berg 已提交
2557 2558

	pos = mgmt->u.auth.variable;
2559
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2560 2561 2562
	if (!elems.challenge)
		return;
	auth_data->expected_transaction = 4;
J
Johannes Berg 已提交
2563
	drv_mgd_prepare_tx(sdata->local, sdata);
2564
	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2565 2566
		tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
			   IEEE80211_TX_INTFL_MLME_CONN_TX;
2567
	ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
J
Johannes Berg 已提交
2568 2569 2570
			    elems.challenge - 2, elems.challenge_len + 2,
			    auth_data->bss->bssid, auth_data->bss->bssid,
			    auth_data->key, auth_data->key_len,
2571
			    auth_data->key_idx, tx_flags);
J
Johannes Berg 已提交
2572 2573
}

2574 2575
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
2576 2577 2578 2579 2580
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u8 bssid[ETH_ALEN];
	u16 auth_alg, auth_transaction, status_code;
	struct sta_info *sta;
2581 2582 2583 2584
	struct ieee80211_event event = {
		.type = MLME_EVENT,
		.u.mlme.data = AUTH_EVENT,
	};
J
Johannes Berg 已提交
2585

2586
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2587 2588

	if (len < 24 + 6)
2589
		return;
J
Johannes Berg 已提交
2590 2591

	if (!ifmgd->auth_data || ifmgd->auth_data->done)
2592
		return;
J
Johannes Berg 已提交
2593 2594 2595

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

2596
	if (!ether_addr_equal(bssid, mgmt->bssid))
2597
		return;
J
Johannes Berg 已提交
2598 2599 2600 2601 2602 2603

	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 ||
2604 2605 2606 2607 2608
	    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);
2609
		return;
2610
	}
J
Johannes Berg 已提交
2611 2612

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
2613 2614
		sdata_info(sdata, "%pM denied authentication (status %d)\n",
			   mgmt->sa, status_code);
2615
		ieee80211_destroy_auth_data(sdata, false);
2616
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2617 2618 2619
		event.u.mlme.status = MLME_DENIED;
		event.u.mlme.reason = status_code;
		drv_event_callback(sdata->local, sdata, &event);
2620
		return;
J
Johannes Berg 已提交
2621 2622 2623 2624 2625 2626
	}

	switch (ifmgd->auth_data->algorithm) {
	case WLAN_AUTH_OPEN:
	case WLAN_AUTH_LEAP:
	case WLAN_AUTH_FT:
2627
	case WLAN_AUTH_SAE:
2628 2629 2630
	case WLAN_AUTH_FILS_SK:
	case WLAN_AUTH_FILS_SK_PFS:
	case WLAN_AUTH_FILS_PK:
J
Johannes Berg 已提交
2631 2632 2633 2634 2635
		break;
	case WLAN_AUTH_SHARED_KEY:
		if (ifmgd->auth_data->expected_transaction != 4) {
			ieee80211_auth_challenge(sdata, mgmt, len);
			/* need another frame */
2636
			return;
J
Johannes Berg 已提交
2637 2638 2639 2640 2641
		}
		break;
	default:
		WARN_ONCE(1, "invalid auth alg %d",
			  ifmgd->auth_data->algorithm);
2642
		return;
J
Johannes Berg 已提交
2643 2644
	}

2645 2646
	event.u.mlme.status = MLME_SUCCESS;
	drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
2647
	sdata_info(sdata, "authenticated\n");
J
Johannes Berg 已提交
2648 2649
	ifmgd->auth_data->done = true;
	ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2650
	ifmgd->auth_data->timeout_started = true;
2651
	run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
2652

2653 2654 2655 2656 2657 2658
	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.
		 */
2659
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2660
		return;
2661 2662
	}

J
Johannes Berg 已提交
2663 2664 2665 2666 2667 2668 2669 2670
	/* 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
2671
		sdata_info(sdata, "failed moving %pM to auth\n", bssid);
J
Johannes Berg 已提交
2672 2673 2674 2675
		goto out_err;
	}
	mutex_unlock(&sdata->local->sta_mtx);

2676
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2677
	return;
J
Johannes Berg 已提交
2678 2679 2680 2681 2682
 out_err:
	mutex_unlock(&sdata->local->sta_mtx);
	/* ignore frame -- wait for timeout */
}

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 2732 2733 2734 2735 2736 2737 2738
#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
2739

2740 2741
static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
2742
{
2743
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2744
	u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2745

2746
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2747

2748
	if (len < 24 + 2)
2749
		return;
2750

2751 2752 2753
	if (ifmgd->associated &&
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
		const u8 *bssid = ifmgd->associated->bssid;
2754

2755 2756 2757
		sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
			   bssid, reason_code,
			   ieee80211_get_reason_code_string(reason_code));
2758

2759
		ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2760

2761 2762 2763 2764
		ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
					    reason_code);
		return;
	}
2765

2766 2767 2768
	if (ifmgd->assoc_data &&
	    ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
		const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2769

2770 2771 2772 2773 2774
		sdata_info(sdata,
			   "deauthenticated from %pM while associating (Reason: %u=%s)\n",
			   bssid, reason_code,
			   ieee80211_get_reason_code_string(reason_code));

2775
		ieee80211_destroy_assoc_data(sdata, false, true);
2776 2777 2778 2779

		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
		return;
	}
2780 2781 2782
}


2783 2784
static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_mgmt *mgmt, size_t len)
2785
{
2786
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2787 2788
	u16 reason_code;

2789
	sdata_assert_lock(sdata);
2790

J
Johannes Berg 已提交
2791
	if (len < 24 + 2)
2792
		return;
2793

J
Johannes Berg 已提交
2794
	if (!ifmgd->associated ||
2795
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2796
		return;
2797 2798 2799

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

J
Johannes Berg 已提交
2800 2801
	sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
		   mgmt->sa, reason_code);
2802

2803 2804
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2805
	ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2806 2807
}

2808 2809 2810 2811
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,
2812 2813
				int *min_rate, int *min_rate_index,
				int shift, u32 rate_flags)
2814 2815 2816 2817
{
	int i, j;

	for (i = 0; i < supp_rates_len; i++) {
2818
		int rate = supp_rates[i] & 0x7f;
2819 2820
		bool is_basic = !!(supp_rates[i] & 0x80);

2821
		if ((rate * 5 * (1 << shift)) > 110)
2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836
			*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++) {
2837 2838 2839 2840 2841 2842 2843 2844 2845
			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) {
2846 2847 2848
				*rates |= BIT(j);
				if (is_basic)
					*basic_rates |= BIT(j);
2849 2850
				if ((rate * 5) < *min_rate) {
					*min_rate = rate * 5;
2851 2852 2853 2854 2855 2856 2857
					*min_rate_index = j;
				}
				break;
			}
		}
	}
}
2858

J
Johannes Berg 已提交
2859 2860
static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
				    struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
2861
				    struct ieee80211_mgmt *mgmt, size_t len)
2862
{
2863
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2864
	struct ieee80211_local *local = sdata->local;
2865
	struct ieee80211_supported_band *sband;
2866
	struct sta_info *sta;
J
Johannes Berg 已提交
2867 2868
	u8 *pos;
	u16 capab_info, aid;
2869
	struct ieee802_11_elems elems;
J
Johannes Berg 已提交
2870
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2871 2872
	const struct cfg80211_bss_ies *bss_ies = NULL;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
J
Johannes Berg 已提交
2873
	u32 changed = 0;
2874
	int err;
2875
	bool ret;
2876

J
Johannes Berg 已提交
2877
	/* AssocResp and ReassocResp have identical structure */
2878 2879

	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
J
Johannes Berg 已提交
2880
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2881

2882
	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
J
Johannes Berg 已提交
2883 2884
		sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
			   aid);
2885 2886
	aid &= ~(BIT(15) | BIT(14));

2887 2888 2889
	ifmgd->broken_ap = false;

	if (aid == 0 || aid > IEEE80211_MAX_AID) {
J
Johannes Berg 已提交
2890 2891
		sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
			   aid);
2892 2893 2894 2895
		aid = 0;
		ifmgd->broken_ap = true;
	}

J
Johannes Berg 已提交
2896
	pos = mgmt->u.assoc_resp.variable;
2897
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2898

2899
	if (!elems.supp_rates) {
J
Johannes Berg 已提交
2900
		sdata_info(sdata, "no SuppRates element in AssocResp\n");
J
Johannes Berg 已提交
2901
		return false;
2902 2903
	}

2904
	ifmgd->aid = aid;
2905 2906 2907
	ifmgd->tdls_chan_switch_prohibited =
		elems.ext_capab && elems.ext_capab_len >= 5 &&
		(elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
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 2965 2966 2967 2968 2969 2970 2971
	/*
	 * 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");
		}
	}

2972 2973 2974 2975 2976 2977 2978
	/*
	 * 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,
2979 2980 2981
			   "HT AP is missing WMM params or HT capability/operation\n");
		ret = false;
		goto out;
2982 2983 2984 2985 2986
	}

	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    (!elems.vht_cap_elem || !elems.vht_operation)) {
		sdata_info(sdata,
2987 2988 2989
			   "VHT AP is missing VHT capability/operation\n");
		ret = false;
		goto out;
2990 2991
	}

2992 2993 2994 2995 2996
	mutex_lock(&sdata->local->sta_mtx);
	/*
	 * station info was already allocated and inserted before
	 * the association and should be available to us
	 */
2997
	sta = sta_info_get(sdata, cbss->bssid);
2998 2999
	if (WARN_ON(!sta)) {
		mutex_unlock(&sdata->local->sta_mtx);
3000 3001
		ret = false;
		goto out;
3002
	}
3003

J
Johannes Berg 已提交
3004
	sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
3005

3006
	/* Set up internal HT/VHT capabilities */
3007
	if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
B
Ben Greear 已提交
3008
		ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3009
						  elems.ht_cap_elem, sta);
3010

M
Mahesh Palivela 已提交
3011 3012
	if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
		ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3013
						    elems.vht_cap_elem, sta);
M
Mahesh Palivela 已提交
3014

3015 3016 3017 3018 3019 3020
	/*
	 * 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.
	 */
3021

3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036
	/*
	 * 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;
	}

3037
	rate_control_rate_init(sta);
3038

3039
	if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
J
Johannes Berg 已提交
3040
		set_sta_flag(sta, WLAN_STA_MFP);
3041 3042 3043 3044
		sta->sta.mfp = true;
	} else {
		sta->sta.mfp = false;
	}
3045

3046
	sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3047

3048
	err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3049 3050 3051
	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
3052 3053 3054
		sdata_info(sdata,
			   "failed to move station %pM to desired state\n",
			   sta->sta.addr);
3055 3056
		WARN_ON(__sta_info_destroy(sta));
		mutex_unlock(&sdata->local->sta_mtx);
3057 3058
		ret = false;
		goto out;
3059 3060
	}

3061
	mutex_unlock(&sdata->local->sta_mtx);
3062

3063 3064 3065 3066 3067 3068 3069 3070
	/*
	 * 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;

3071
	if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3072
		ieee80211_set_wmm_default(sdata, false, false);
3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085
	} 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;
	}
3086
	changed |= BSS_CHANGED_QOS;
3087

J
Johannes Berg 已提交
3088 3089 3090 3091
	/* set AID and assoc capability,
	 * ieee80211_set_associated() will tell the driver */
	bss_conf->aid = aid;
	bss_conf->assoc_capability = capab_info;
3092
	ieee80211_set_associated(sdata, cbss, changed);
3093

3094 3095 3096 3097 3098 3099 3100
	/*
	 * 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);

3101
	/*
J
Johannes Berg 已提交
3102 3103
	 * Start timer to probe the connection to the AP now.
	 * Also start the timer that will detect beacon loss.
3104
	 */
J
Johannes Berg 已提交
3105
	ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3106
	ieee80211_sta_reset_beacon_monitor(sdata);
3107

3108 3109 3110 3111
	ret = true;
 out:
	kfree(bss_ies);
	return ret;
3112 3113
}

3114 3115 3116
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
3117 3118 3119 3120 3121
{
	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;
3122
	int ac, uapsd_queues = -1;
J
Johannes Berg 已提交
3123 3124
	u8 *pos;
	bool reassoc;
3125
	struct cfg80211_bss *bss;
3126 3127 3128 3129
	struct ieee80211_event event = {
		.type = MLME_EVENT,
		.u.mlme.data = ASSOC_EVENT,
	};
J
Johannes Berg 已提交
3130

3131
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3132 3133

	if (!assoc_data)
3134
		return;
3135
	if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3136
		return;
J
Johannes Berg 已提交
3137 3138 3139 3140 3141 3142 3143

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

	if (len < 24 + 6)
3144
		return;
J
Johannes Berg 已提交
3145 3146 3147 3148 3149 3150

	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
3151 3152 3153 3154
	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
3155

3156 3157 3158 3159
	if (assoc_data->fils_kek_len &&
	    fils_decrypt_assoc_resp(sdata, (u8 *)mgmt, &len, assoc_data) < 0)
		return;

J
Johannes Berg 已提交
3160
	pos = mgmt->u.assoc_resp.variable;
3161
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
3162 3163

	if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3164 3165
	    elems.timeout_int &&
	    elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
J
Johannes Berg 已提交
3166
		u32 tu, ms;
3167
		tu = le32_to_cpu(elems.timeout_int->value);
J
Johannes Berg 已提交
3168
		ms = tu * 1024 / 1000;
J
Johannes Berg 已提交
3169 3170 3171
		sdata_info(sdata,
			   "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
			   mgmt->sa, tu, ms);
J
Johannes Berg 已提交
3172
		assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3173
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
3174
		if (ms > IEEE80211_ASSOC_TIMEOUT)
3175 3176
			run_again(sdata, assoc_data->timeout);
		return;
J
Johannes Berg 已提交
3177 3178
	}

3179
	bss = assoc_data->bss;
J
Johannes Berg 已提交
3180 3181

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
3182 3183
		sdata_info(sdata, "%pM denied association (code=%d)\n",
			   mgmt->sa, status_code);
3184
		ieee80211_destroy_assoc_data(sdata, false, false);
3185 3186 3187
		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
3188
	} else {
3189
		if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
J
Johannes Berg 已提交
3190
			/* oops -- internal error -- send timeout for now */
3191
			ieee80211_destroy_assoc_data(sdata, false, false);
3192
			cfg80211_assoc_timeout(sdata->dev, bss);
3193
			return;
J
Johannes Berg 已提交
3194
		}
3195 3196
		event.u.mlme.status = MLME_SUCCESS;
		drv_event_callback(sdata->local, sdata, &event);
3197
		sdata_info(sdata, "associated\n");
3198 3199 3200 3201 3202 3203

		/*
		 * 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
		 */
3204
		ieee80211_destroy_assoc_data(sdata, true, false);
3205 3206 3207 3208 3209

		/* get uapsd queues configuration */
		uapsd_queues = 0;
		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
			if (sdata->tx_conf[ac].uapsd)
3210
				uapsd_queues |= ieee80211_ac_to_qos_mask[ac];
J
Johannes Berg 已提交
3211 3212
	}

3213
	cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
J
Johannes Berg 已提交
3214
}
J
Johannes Berg 已提交
3215

3216
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
3217
				  struct ieee80211_mgmt *mgmt, size_t len,
3218
				  struct ieee80211_rx_status *rx_status,
3219
				  struct ieee802_11_elems *elems)
3220 3221
{
	struct ieee80211_local *local = sdata->local;
3222
	struct ieee80211_bss *bss;
3223
	struct ieee80211_channel *channel;
3224

3225
	sdata_assert_lock(sdata);
3226

3227 3228
	channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
	if (!channel)
3229 3230 3231
		return;

	bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3232
					channel);
3233 3234
	if (bss) {
		sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3235
		ieee80211_rx_bss_put(local, bss);
3236
	}
3237 3238 3239
}


3240
static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
3241
					 struct sk_buff *skb)
3242
{
J
Johannes Berg 已提交
3243
	struct ieee80211_mgmt *mgmt = (void *)skb->data;
3244
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
3245 3246
	struct ieee80211_rx_status *rx_status = (void *) skb->cb;
	size_t baselen, len = skb->len;
3247 3248
	struct ieee802_11_elems elems;

3249 3250
	ifmgd = &sdata->u.mgd;

3251
	sdata_assert_lock(sdata);
3252

3253
	if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3254 3255
		return; /* ignore ProbeResp to foreign address */

3256 3257 3258 3259 3260
	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
	if (baselen > len)
		return;

	ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3261
			       false, &elems);
3262

3263
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3264

3265
	if (ifmgd->associated &&
3266
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3267
		ieee80211_reset_ap_probe(sdata);
3268 3269
}

3270 3271 3272
/*
 * This is the canonical list of information elements we care about,
 * the filter code also gives us all changes to the Microsoft OUI
3273 3274 3275
 * (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.
3276 3277 3278 3279 3280 3281 3282 3283 3284 3285
 *
 * 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 =
3286 3287 3288 3289 3290
	(1ULL << WLAN_EID_COUNTRY) |
	(1ULL << WLAN_EID_ERP_INFO) |
	(1ULL << WLAN_EID_CHANNEL_SWITCH) |
	(1ULL << WLAN_EID_PWR_CONSTRAINT) |
	(1ULL << WLAN_EID_HT_CAPABILITY) |
3291 3292
	(1ULL << WLAN_EID_HT_OPERATION) |
	(1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3293

3294 3295 3296
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)
3297
{
3298
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3299
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3300 3301
	size_t baselen;
	struct ieee802_11_elems elems;
3302
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
3303 3304
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
3305
	struct sta_info *sta;
3306
	u32 changed = 0;
3307
	bool erp_valid;
J
Johannes Berg 已提交
3308
	u8 erp_value = 0;
3309
	u32 ncrc;
3310
	u8 *bssid;
3311
	u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3312

3313
	sdata_assert_lock(sdata);
3314

3315 3316 3317
	/* Process beacon from the current BSS */
	baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
	if (baselen > len)
3318
		return;
3319

J
Johannes Berg 已提交
3320 3321 3322 3323
	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		rcu_read_unlock();
3324
		return;
J
Johannes Berg 已提交
3325 3326
	}

3327
	if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
J
Johannes Berg 已提交
3328
		rcu_read_unlock();
3329
		return;
J
Johannes Berg 已提交
3330
	}
3331
	chan = chanctx_conf->def.chan;
J
Johannes Berg 已提交
3332
	rcu_read_unlock();
3333

3334
	if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3335
	    ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
J
Johannes Berg 已提交
3336
		ieee802_11_parse_elems(mgmt->u.beacon.variable,
3337
				       len - baselen, false, &elems);
3338

3339
		ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3340 3341 3342 3343
		if (elems.tim && !elems.parse_error) {
			const struct ieee80211_tim_ie *tim_ie = elems.tim;
			ifmgd->dtim_period = tim_ie->dtim_period;
		}
3344
		ifmgd->have_beacon = true;
3345
		ifmgd->assoc_data->need_beacon = false;
3346
		if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3347 3348 3349 3350 3351 3352 3353 3354 3355 3356
			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
3357 3358
		/* continue assoc process */
		ifmgd->assoc_data->timeout = jiffies;
3359
		ifmgd->assoc_data->timeout_started = true;
3360 3361
		run_again(sdata, ifmgd->assoc_data->timeout);
		return;
J
Johannes Berg 已提交
3362
	}
3363

J
Johannes Berg 已提交
3364
	if (!ifmgd->associated ||
3365
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3366
		return;
J
Johannes Berg 已提交
3367
	bssid = ifmgd->associated->bssid;
3368

3369 3370 3371
	/* 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;
3372
		ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3373
		ifmgd->last_cqm_event_signal = 0;
3374
		ifmgd->count_beacon_signal = 1;
3375
		ifmgd->last_ave_beacon_signal = 0;
3376
	} else {
3377
		ifmgd->count_beacon_signal++;
3378
	}
3379

3380 3381
	ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);

3382 3383
	if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3384
		int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3385
		int last_sig = ifmgd->last_ave_beacon_signal;
3386 3387 3388
		struct ieee80211_event event = {
			.type = RSSI_EVENT,
		};
3389 3390 3391 3392 3393 3394 3395 3396

		/*
		 * 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;
3397 3398
			event.u.rssi.data = RSSI_EVENT_HIGH;
			drv_event_callback(local, sdata, &event);
3399 3400 3401 3402
		} else if (sig < ifmgd->rssi_min_thold &&
			   (last_sig >= ifmgd->rssi_max_thold ||
			   last_sig == 0)) {
			ifmgd->last_ave_beacon_signal = sig;
3403 3404
			event.u.rssi.data = RSSI_EVENT_LOW;
			drv_event_callback(local, sdata, &event);
3405 3406 3407
		}
	}

3408
	if (bss_conf->cqm_rssi_thold &&
3409
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3410
	    !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3411
		int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3412 3413 3414
		int last_event = ifmgd->last_cqm_event_signal;
		int thold = bss_conf->cqm_rssi_thold;
		int hyst = bss_conf->cqm_rssi_hyst;
3415

3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432
		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);
		}
	}

3433
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
J
Johannes Berg 已提交
3434
		mlme_dbg_ratelimited(sdata,
3435
				     "cancelling AP probe due to a received beacon\n");
3436
		ieee80211_reset_ap_probe(sdata);
3437 3438
	}

J
Johannes Berg 已提交
3439 3440 3441 3442
	/*
	 * Push the beacon loss detection into the future since
	 * we are processing a beacon from the AP just now.
	 */
3443
	ieee80211_sta_reset_beacon_monitor(sdata);
J
Johannes Berg 已提交
3444

3445 3446
	ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
	ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3447
					  len - baselen, false, &elems,
3448 3449
					  care_about_ies, ncrc);

3450 3451 3452 3453 3454 3455 3456
	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);
3457
			}
3458
			ieee80211_send_nullfunc(local, sdata, false);
3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470
		} 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);
3471 3472
		}
	}
J
Johannes Berg 已提交
3473

3474 3475
	if (sdata->vif.p2p ||
	    sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
J
Janusz Dziedzic 已提交
3476
		struct ieee80211_p2p_noa_attr noa = {};
3477 3478 3479 3480 3481
		int ret;

		ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
					    len - baselen,
					    IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3482
					    (u8 *) &noa, sizeof(noa));
J
Janusz Dziedzic 已提交
3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498
		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));
3499 3500 3501 3502 3503
			changed |= BSS_CHANGED_P2P_PS;
			ifmgd->beacon_crc_valid = false;
		}
	}

3504 3505 3506
	if (ifmgd->csa_waiting_bcn)
		ieee80211_chswitch_post_beacon(sdata);

3507 3508 3509 3510 3511 3512 3513 3514
	/*
	 * 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.
	 */
3515
	if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526
		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;
	}

3527
	if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3528
		return;
3529
	ifmgd->beacon_crc = ncrc;
3530
	ifmgd->beacon_crc_valid = true;
3531

3532
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3533

3534
	ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3535
					 rx_status->device_timestamp,
3536 3537
					 &elems, true);

3538 3539
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
	    ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3540 3541 3542
				     elems.wmm_param_len))
		changed |= BSS_CHANGED_QOS;

3543 3544
	/*
	 * If we haven't had a beacon before, tell the driver about the
3545
	 * DTIM period (and beacon timing if desired) now.
3546
	 */
3547
	if (!ifmgd->have_beacon) {
3548 3549 3550 3551 3552
		/* 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;
3553

3554 3555
		changed |= BSS_CHANGED_BEACON_INFO;
		ifmgd->have_beacon = true;
3556 3557

		mutex_lock(&local->iflist_mtx);
J
Johannes Berg 已提交
3558
		ieee80211_recalc_ps(local);
3559 3560
		mutex_unlock(&local->iflist_mtx);

3561
		ieee80211_recalc_ps_vif(sdata);
3562 3563
	}

3564
	if (elems.erp_info) {
J
Johannes Berg 已提交
3565 3566 3567 3568
		erp_valid = true;
		erp_value = elems.erp_info[0];
	} else {
		erp_valid = false;
3569
	}
J
Johannes Berg 已提交
3570 3571 3572
	changed |= ieee80211_handle_bss_capability(sdata,
			le16_to_cpu(mgmt->u.beacon.capab_info),
			erp_valid, erp_value);
3573

3574
	mutex_lock(&local->sta_mtx);
3575 3576
	sta = sta_info_get(sdata, bssid);

3577 3578
	if (ieee80211_config_bw(sdata, sta,
				elems.ht_cap_elem, elems.ht_operation,
3579 3580
				elems.vht_operation, bssid, &changed)) {
		mutex_unlock(&local->sta_mtx);
3581 3582 3583
		sdata_info(sdata,
			   "failed to follow AP %pM bandwidth change, disconnect\n",
			   bssid);
3584 3585 3586
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_DEAUTH_LEAVING,
				       true, deauth_buf);
3587 3588 3589
		ieee80211_report_disconnect(sdata, deauth_buf,
					    sizeof(deauth_buf), true,
					    WLAN_REASON_DEAUTH_LEAVING);
3590
		return;
3591
	}
3592 3593 3594

	if (sta && elems.opmode_notif)
		ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3595
					    rx_status->band);
3596
	mutex_unlock(&local->sta_mtx);
3597

3598 3599 3600
	changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
					       elems.country_elem,
					       elems.country_elem_len,
3601 3602
					       elems.pwr_constr_elem,
					       elems.cisco_dtpc_elem);
3603

3604
	ieee80211_bss_info_change_notify(sdata, changed);
3605 3606
}

3607 3608
void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
				  struct sk_buff *skb)
3609 3610 3611 3612
{
	struct ieee80211_rx_status *rx_status;
	struct ieee80211_mgmt *mgmt;
	u16 fc;
3613 3614
	struct ieee802_11_elems elems;
	int ies_len;
3615 3616 3617 3618 3619

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

3620
	sdata_lock(sdata);
3621

J
Johannes Berg 已提交
3622 3623
	switch (fc & IEEE80211_FCTL_STYPE) {
	case IEEE80211_STYPE_BEACON:
3624
		ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
J
Johannes Berg 已提交
3625 3626 3627 3628 3629
		break;
	case IEEE80211_STYPE_PROBE_RESP:
		ieee80211_rx_mgmt_probe_resp(sdata, skb);
		break;
	case IEEE80211_STYPE_AUTH:
3630
		ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3631 3632
		break;
	case IEEE80211_STYPE_DEAUTH:
3633
		ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3634 3635
		break;
	case IEEE80211_STYPE_DISASSOC:
3636
		ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3637 3638 3639
		break;
	case IEEE80211_STYPE_ASSOC_RESP:
	case IEEE80211_STYPE_REASSOC_RESP:
3640
		ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3641 3642
		break;
	case IEEE80211_STYPE_ACTION:
3643
		if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3644 3645 3646
			ies_len = skb->len -
				  offsetof(struct ieee80211_mgmt,
					   u.action.u.chan_switch.variable);
3647 3648 3649 3650 3651 3652

			if (ies_len < 0)
				break;

			ieee802_11_parse_elems(
				mgmt->u.action.u.chan_switch.variable,
3653
				ies_len, true, &elems);
3654 3655 3656 3657

			if (elems.parse_error)
				break;

3658
			ieee80211_sta_process_chanswitch(sdata,
3659 3660 3661
						 rx_status->mactime,
						 rx_status->device_timestamp,
						 &elems, false);
3662 3663 3664 3665 3666 3667 3668 3669 3670 3671
		} 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,
3672
				ies_len, true, &elems);
3673 3674 3675 3676 3677 3678 3679 3680

			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
3681
			ieee80211_sta_process_chanswitch(sdata,
3682 3683 3684
						 rx_status->mactime,
						 rx_status->device_timestamp,
						 &elems, false);
3685
		}
3686
		break;
3687
	}
3688
	sdata_unlock(sdata);
3689 3690
}

J
Johannes Berg 已提交
3691
static void ieee80211_sta_timer(unsigned long data)
3692
{
J
Johannes Berg 已提交
3693 3694
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
3695

3696
	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3697 3698
}

3699
static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3700
					  u8 *bssid, u8 reason, bool tx)
3701
{
3702
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3703

3704
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3705
			       tx, frame_buf);
3706

3707 3708
	ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
				    reason);
3709 3710
}

3711
static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
3712 3713 3714 3715
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3716
	u32 tx_flags = 0;
3717 3718
	u16 trans = 1;
	u16 status = 0;
J
Johannes Berg 已提交
3719

3720
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3721 3722 3723 3724 3725 3726 3727

	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
3728 3729
		sdata_info(sdata, "authentication with %pM timed out\n",
			   auth_data->bss->bssid);
J
Johannes Berg 已提交
3730 3731 3732 3733 3734 3735 3736 3737 3738 3739

		/*
		 * 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
3740 3741
	drv_mgd_prepare_tx(local, sdata);

3742 3743 3744
	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
3745

3746
	auth_data->expected_transaction = 2;
3747

3748 3749 3750 3751 3752
	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
3753

3754 3755 3756
	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
3757

3758 3759 3760 3761 3762
	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
3763

3764
	if (tx_flags == 0) {
3765
		auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3766
		auth_data->timeout_started = true;
3767
		run_again(sdata, auth_data->timeout);
3768
	} else {
3769 3770 3771 3772
		auth_data->timeout =
			round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
		auth_data->timeout_started = true;
		run_again(sdata, auth_data->timeout);
3773
	}
J
Johannes Berg 已提交
3774 3775 3776 3777 3778 3779 3780 3781 3782

	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;

3783
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3784 3785 3786

	assoc_data->tries++;
	if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
J
Johannes Berg 已提交
3787 3788
		sdata_info(sdata, "association with %pM timed out\n",
			   assoc_data->bss->bssid);
J
Johannes Berg 已提交
3789 3790 3791 3792 3793 3794 3795 3796 3797 3798

		/*
		 * 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
3799 3800 3801
	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
3802 3803
	ieee80211_send_assoc(sdata);

3804
	if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3805
		assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3806
		assoc_data->timeout_started = true;
3807
		run_again(sdata, assoc_data->timeout);
3808
	} else {
3809 3810 3811 3812 3813
		assoc_data->timeout =
			round_jiffies_up(jiffies +
					 IEEE80211_ASSOC_TIMEOUT_LONG);
		assoc_data->timeout_started = true;
		run_again(sdata, assoc_data->timeout);
3814
	}
J
Johannes Berg 已提交
3815 3816 3817 3818

	return 0;
}

3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830
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);
}

3831
void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
3832 3833
{
	struct ieee80211_local *local = sdata->local;
3834
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3835

3836
	sdata_lock(sdata);
3837

3838 3839 3840 3841 3842
	if (ifmgd->status_received) {
		__le16 fc = ifmgd->status_fc;
		bool status_acked = ifmgd->status_acked;

		ifmgd->status_received = false;
3843
		if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3844 3845 3846
			if (status_acked) {
				ifmgd->auth_data->timeout =
					jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3847
				run_again(sdata, ifmgd->auth_data->timeout);
3848 3849 3850
			} else {
				ifmgd->auth_data->timeout = jiffies - 1;
			}
3851
			ifmgd->auth_data->timeout_started = true;
3852 3853 3854 3855 3856 3857
		} 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;
3858
				run_again(sdata, ifmgd->assoc_data->timeout);
3859 3860 3861
			} else {
				ifmgd->assoc_data->timeout = jiffies - 1;
			}
3862
			ifmgd->assoc_data->timeout_started = true;
3863 3864 3865
		}
	}

3866
	if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
J
Johannes Berg 已提交
3867 3868 3869 3870 3871 3872 3873
	    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);
3874
		} else if (ieee80211_auth(sdata)) {
J
Johannes Berg 已提交
3875
			u8 bssid[ETH_ALEN];
3876 3877 3878 3879 3880
			struct ieee80211_event event = {
				.type = MLME_EVENT,
				.u.mlme.data = AUTH_EVENT,
				.u.mlme.status = MLME_TIMEOUT,
			};
J
Johannes Berg 已提交
3881 3882 3883 3884 3885

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

			ieee80211_destroy_auth_data(sdata, false);

3886
			cfg80211_auth_timeout(sdata->dev, bssid);
3887
			drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
3888
		}
3889
	} else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3890
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
3891

3892
	if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
J
Johannes Berg 已提交
3893
	    time_after(jiffies, ifmgd->assoc_data->timeout)) {
3894
		if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
J
Johannes Berg 已提交
3895
		    ieee80211_do_assoc(sdata)) {
3896
			struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3897 3898 3899 3900 3901
			struct ieee80211_event event = {
				.type = MLME_EVENT,
				.u.mlme.data = ASSOC_EVENT,
				.u.mlme.status = MLME_TIMEOUT,
			};
J
Johannes Berg 已提交
3902

3903
			ieee80211_destroy_assoc_data(sdata, false, false);
3904
			cfg80211_assoc_timeout(sdata->dev, bss);
3905
			drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
3906
		}
3907
	} else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3908
		run_again(sdata, ifmgd->assoc_data->timeout);
J
Johannes Berg 已提交
3909

3910
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
J
Johannes Berg 已提交
3911
	    ifmgd->associated) {
3912
		u8 bssid[ETH_ALEN];
3913
		int max_tries;
3914

3915
		memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3916

3917
		if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3918
			max_tries = max_nullfunc_tries;
3919
		else
3920
			max_tries = max_probe_tries;
3921

3922 3923 3924
		/* ACK received for nullfunc probing frame */
		if (!ifmgd->probe_send_count)
			ieee80211_reset_ap_probe(sdata);
3925 3926
		else if (ifmgd->nullfunc_failed) {
			if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3927 3928 3929 3930
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
					 bssid, ifmgd->probe_send_count,
					 max_tries);
3931 3932
				ieee80211_mgd_probe_ap_send(sdata);
			} else {
J
Johannes Berg 已提交
3933 3934 3935
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
					 bssid);
3936
				ieee80211_sta_connection_lost(sdata, bssid,
3937 3938
					WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
					false);
3939 3940
			}
		} else if (time_is_after_jiffies(ifmgd->probe_timeout))
3941
			run_again(sdata, ifmgd->probe_timeout);
3942
		else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
J
Johannes Berg 已提交
3943 3944 3945
			mlme_dbg(sdata,
				 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
				 bssid, probe_wait_ms);
3946
			ieee80211_sta_connection_lost(sdata, bssid,
3947
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3948
		} else if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3949 3950 3951 3952
			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);
3953 3954
			ieee80211_mgd_probe_ap_send(sdata);
		} else {
J
Johannes Berg 已提交
3955 3956 3957 3958
			/*
			 * We actually lost the connection ... or did we?
			 * Let's make sure!
			 */
3959 3960 3961
			mlme_dbg(sdata,
				 "No probe response from AP %pM after %dms, disconnecting.\n",
				 bssid, probe_wait_ms);
3962

3963
			ieee80211_sta_connection_lost(sdata, bssid,
3964
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
J
Johannes Berg 已提交
3965 3966 3967
		}
	}

3968
	sdata_unlock(sdata);
3969 3970
}

J
Johannes Berg 已提交
3971 3972 3973 3974
static void ieee80211_sta_bcn_mon_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
3975
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3976

3977
	if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
M
Michal Kazior 已提交
3978 3979
		return;

3980
	sdata->u.mgd.connection_loss = false;
3981 3982
	ieee80211_queue_work(&sdata->local->hw,
			     &sdata->u.mgd.beacon_connection_loss_work);
J
Johannes Berg 已提交
3983 3984 3985 3986 3987 3988 3989 3990 3991
}

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;

3992
	if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
M
Michal Kazior 已提交
3993 3994
		return;

3995
	ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
J
Johannes Berg 已提交
3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006
}

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
4007 4008
static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
4009
	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4010
		__ieee80211_stop_poll(sdata);
4011

J
Johannes Berg 已提交
4012
		/* let's probe the connection once */
4013
		if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4014 4015
			ieee80211_queue_work(&sdata->local->hw,
					     &sdata->u.mgd.monitor_work);
4016
	}
J
Johannes Berg 已提交
4017
}
4018

4019
#ifdef CONFIG_PM
4020 4021 4022 4023 4024 4025 4026
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);

4027 4028 4029 4030 4031
	if (ifmgd->auth_data || ifmgd->assoc_data) {
		const u8 *bssid = ifmgd->auth_data ?
				ifmgd->auth_data->bss->bssid :
				ifmgd->assoc_data->bss->bssid;

4032
		/*
4033 4034 4035
		 * 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.
4036
		 */
4037
		ieee80211_send_deauth_disassoc(sdata, bssid,
4038 4039 4040
					       IEEE80211_STYPE_DEAUTH,
					       WLAN_REASON_DEAUTH_LEAVING,
					       false, frame_buf);
4041
		if (ifmgd->assoc_data)
4042
			ieee80211_destroy_assoc_data(sdata, false, true);
4043 4044
		if (ifmgd->auth_data)
			ieee80211_destroy_auth_data(sdata, false);
4045 4046 4047 4048
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
	}

4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076
	/* 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);
	}

4077 4078 4079
	sdata_unlock(sdata);
}

4080 4081 4082 4083
void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

4084
	sdata_lock(sdata);
4085
	if (!ifmgd->associated) {
4086
		sdata_unlock(sdata);
4087 4088 4089 4090 4091 4092 4093 4094 4095 4096
		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);
4097
		sdata_unlock(sdata);
4098 4099
		return;
	}
4100
	sdata_unlock(sdata);
4101 4102 4103
}
#endif

J
Johannes Berg 已提交
4104 4105
/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4106
{
4107
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
4108

4109
	ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
4110
	INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4111
	INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4112 4113
	INIT_WORK(&ifmgd->beacon_connection_loss_work,
		  ieee80211_beacon_connection_loss_work);
4114 4115
	INIT_WORK(&ifmgd->csa_connection_drop_work,
		  ieee80211_csa_connection_drop_work);
4116
	INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4117 4118
	INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
			  ieee80211_tdls_peer_del_work);
4119
	setup_timer(&ifmgd->timer, ieee80211_sta_timer,
S
Sujith 已提交
4120
		    (unsigned long) sdata);
J
Johannes Berg 已提交
4121 4122 4123 4124
	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);
4125
	setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
J
Johannes Berg 已提交
4126
		    (unsigned long) sdata);
4127 4128
	INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
			  ieee80211_sta_handle_tspec_ac_params_wk);
J
Johannes Berg 已提交
4129

4130
	ifmgd->flags = 0;
4131
	ifmgd->powersave = sdata->wdev.ps;
4132 4133
	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
4134
	ifmgd->p2p_noa_index = -1;
J
Johannes Berg 已提交
4135

4136
	if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4137 4138 4139
		ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
	else
		ifmgd->req_smps = IEEE80211_SMPS_OFF;
4140 4141 4142 4143 4144

	/* Setup TDLS data */
	spin_lock_init(&ifmgd->teardown_lock);
	ifmgd->teardown_skb = NULL;
	ifmgd->orig_teardown_skb = NULL;
4145 4146
}

4147 4148
/* scan finished notification */
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
J
Johannes Berg 已提交
4149
{
4150
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
4151

4152 4153
	/* Restart STA timers */
	rcu_read_lock();
4154 4155 4156 4157
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (ieee80211_sdata_running(sdata))
			ieee80211_restart_sta_timer(sdata);
	}
4158 4159
	rcu_read_unlock();
}
J
Johannes Berg 已提交
4160

J
Johannes Berg 已提交
4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172
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;

4173
	ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
J
Johannes Berg 已提交
4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185
	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;

4186
	vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
J
Johannes Berg 已提交
4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204
	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;
}

4205 4206
static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
				  struct cfg80211_bss *cbss)
4207 4208 4209
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4210
	const struct ieee80211_ht_cap *ht_cap = NULL;
4211
	const struct ieee80211_ht_operation *ht_oper = NULL;
J
Johannes Berg 已提交
4212
	const struct ieee80211_vht_operation *vht_oper = NULL;
4213
	struct ieee80211_supported_band *sband;
4214
	struct cfg80211_chan_def chandef;
J
Johannes Berg 已提交
4215
	int ret;
4216 4217
	u32 i;
	bool have_80mhz;
4218

4219 4220
	sband = local->hw.wiphy->bands[cbss->channel->band];

J
Johannes Berg 已提交
4221 4222 4223 4224
	ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
			  IEEE80211_STA_DISABLE_80P80MHZ |
			  IEEE80211_STA_DISABLE_160MHZ);

4225 4226
	rcu_read_lock();

J
Johannes Berg 已提交
4227 4228
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	    sband->ht_cap.ht_supported) {
4229
		const u8 *ht_oper_ie, *ht_cap_ie;
4230

4231
		ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4232 4233
		if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
			ht_oper = (void *)(ht_oper_ie + 2);
4234

4235 4236 4237 4238 4239
		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) {
4240 4241 4242
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ht_oper = NULL;
		}
4243 4244
	}

J
Johannes Berg 已提交
4245 4246
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    sband->vht_cap.vht_supported) {
4247
		const u8 *vht_oper_ie, *vht_cap;
J
Johannes Berg 已提交
4248

4249 4250
		vht_oper_ie = ieee80211_bss_get_ie(cbss,
						   WLAN_EID_VHT_OPERATION);
J
Johannes Berg 已提交
4251 4252 4253 4254
		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
4255
			sdata_info(sdata,
J
Johannes Berg 已提交
4256
				   "AP advertised VHT without HT, disabling both\n");
4257 4258
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4259
		}
4260 4261 4262 4263 4264 4265

		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;
		}
4266 4267
	}

4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281
	/* 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
4282 4283
	ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
						     cbss->channel,
4284
						     ht_cap, ht_oper, vht_oper,
4285
						     &chandef, false);
4286

J
Johannes Berg 已提交
4287 4288
	sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
				      local->rx_chains);
4289

4290 4291
	rcu_read_unlock();

4292 4293 4294
	/* will change later if needed */
	sdata->smps_mode = IEEE80211_SMPS_OFF;

4295
	mutex_lock(&local->mtx);
J
Johannes Berg 已提交
4296 4297 4298 4299 4300 4301 4302
	/*
	 * 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);
4303 4304 4305 4306

	/* don't downgrade for 5 and 10 MHz channels, though. */
	if (chandef.width == NL80211_CHAN_WIDTH_5 ||
	    chandef.width == NL80211_CHAN_WIDTH_10)
4307
		goto out;
4308

4309
	while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4310
		ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4311 4312 4313
		ret = ieee80211_vif_use_channel(sdata, &chandef,
						IEEE80211_CHANCTX_SHARED);
	}
4314 4315
 out:
	mutex_unlock(&local->mtx);
J
Johannes Berg 已提交
4316
	return ret;
4317 4318 4319
}

static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4320 4321
				     struct cfg80211_bss *cbss, bool assoc,
				     bool override)
4322 4323 4324 4325 4326
{
	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;
4327
	struct ieee80211_supported_band *sband;
4328
	bool have_sta = false;
4329 4330
	int err;

4331 4332
	sband = local->hw.wiphy->bands[cbss->channel->band];

4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346
	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;
	}
4347

4348
	if (new_sta || override) {
4349 4350 4351 4352 4353 4354 4355 4356
		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
4357
	if (new_sta) {
4358 4359 4360
		u32 rates = 0, basic_rates = 0;
		bool have_higher_than_11mbit;
		int min_rate = INT_MAX, min_rate_index = -1;
4361
		struct ieee80211_chanctx_conf *chanctx_conf;
J
Johannes Berg 已提交
4362
		const struct cfg80211_bss_ies *ies;
4363
		int shift = ieee80211_vif_get_shift(&sdata->vif);
4364
		u32 rate_flags;
4365

4366 4367 4368 4369
		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
4370
			sta_info_free(local, new_sta);
4371 4372 4373 4374
			return -EINVAL;
		}
		rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
		rcu_read_unlock();
4375 4376 4377 4378 4379

		ieee80211_get_rates(sband, bss->supp_rates,
				    bss->supp_rates_len,
				    &rates, &basic_rates,
				    &have_higher_than_11mbit,
4380 4381
				    &min_rate, &min_rate_index,
				    shift, rate_flags);
4382 4383 4384 4385 4386 4387 4388 4389 4390 4391

		/*
		 * 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
4392 4393
			sdata_info(sdata,
				   "No basic rates, using min rate instead\n");
4394 4395 4396
			basic_rates = BIT(min_rate_index);
		}

J
Johannes Berg 已提交
4397
		new_sta->sta.supp_rates[cbss->channel->band] = rates;
4398 4399 4400
		sdata->vif.bss_conf.basic_rates = basic_rates;

		/* cf. IEEE 802.11 9.2.12 */
4401
		if (cbss->channel->band == NL80211_BAND_2GHZ &&
4402 4403 4404 4405 4406 4407 4408
		    have_higher_than_11mbit)
			sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
		else
			sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

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

4409 4410
		/* set timing information */
		sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
J
Johannes Berg 已提交
4411
		rcu_read_lock();
4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424
		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;
4425 4426
		} else if (!ieee80211_hw_check(&sdata->local->hw,
					       TIMING_BEACON_ONLY)) {
4427 4428 4429 4430 4431 4432 4433 4434 4435 4436 4437
			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
4438
		rcu_read_unlock();
4439 4440

		/* tell driver about BSSID, basic rates and timing */
4441
		ieee80211_bss_info_change_notify(sdata,
4442 4443
			BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
			BSS_CHANGED_BEACON_INT);
4444 4445

		if (assoc)
J
Johannes Berg 已提交
4446
			sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4447

J
Johannes Berg 已提交
4448 4449
		err = sta_info_insert(new_sta);
		new_sta = NULL;
4450
		if (err) {
J
Johannes Berg 已提交
4451 4452 4453
			sdata_info(sdata,
				   "failed to insert STA entry for the AP (error %d)\n",
				   err);
4454 4455 4456
			return err;
		}
	} else
4457
		WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4458

4459 4460 4461 4462
	/* Cancel scan to ensure that nothing interferes with connection */
	if (local->scanning)
		ieee80211_scan_cancel(local);

4463 4464 4465
	return 0;
}

4466 4467 4468
/* config hooks */
int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
		       struct cfg80211_auth_request *req)
J
Johannes Berg 已提交
4469
{
J
Johannes Berg 已提交
4470 4471 4472
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data;
4473
	u16 auth_alg;
J
Johannes Berg 已提交
4474 4475 4476
	int err;

	/* prepare auth data structure */
J
Johannes Berg 已提交
4477

4478 4479 4480 4481 4482
	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
4483
		if (IS_ERR(local->wep_tx_tfm))
4484
			return -EOPNOTSUPP;
4485 4486 4487 4488 4489 4490 4491 4492
		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;
4493 4494 4495
	case NL80211_AUTHTYPE_SAE:
		auth_alg = WLAN_AUTH_SAE;
		break;
4496 4497 4498 4499 4500 4501 4502 4503 4504
	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;
4505 4506
	default:
		return -EOPNOTSUPP;
J
Johannes Berg 已提交
4507
	}
4508

4509
	auth_data = kzalloc(sizeof(*auth_data) + req->auth_data_len +
4510
			    req->ie_len, GFP_KERNEL);
J
Johannes Berg 已提交
4511
	if (!auth_data)
J
Johannes Berg 已提交
4512
		return -ENOMEM;
4513

J
Johannes Berg 已提交
4514
	auth_data->bss = req->bss;
4515

4516
	if (req->auth_data_len >= 4) {
4517 4518 4519 4520 4521 4522
		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]);
		}
4523 4524 4525
		memcpy(auth_data->data, req->auth_data + 4,
		       req->auth_data_len - 4);
		auth_data->data_len += req->auth_data_len - 4;
4526 4527
	}

4528
	if (req->ie && req->ie_len) {
4529 4530 4531
		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
4532
	}
4533

J
Johannes Berg 已提交
4534
	if (req->key && req->key_len) {
J
Johannes Berg 已提交
4535 4536 4537
		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
4538 4539
	}

J
Johannes Berg 已提交
4540
	auth_data->algorithm = auth_alg;
J
Johannes Berg 已提交
4541

J
Johannes Berg 已提交
4542
	/* try to authenticate/probe */
4543

J
Johannes Berg 已提交
4544 4545 4546 4547
	if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
	    ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
4548 4549
	}

J
Johannes Berg 已提交
4550 4551
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
4552

J
Johannes Berg 已提交
4553 4554
	/* prep auth_data so we don't go into idle on disassoc */
	ifmgd->auth_data = auth_data;
J
Johannes Berg 已提交
4555

4556 4557 4558
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

4559 4560 4561
		sdata_info(sdata,
			   "disconnect from AP %pM for new auth to %pM\n",
			   ifmgd->associated->bssid, req->bss->bssid);
4562 4563 4564 4565
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_UNSPECIFIED,
				       false, frame_buf);

4566 4567 4568
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    WLAN_REASON_UNSPECIFIED);
4569
	}
J
Johannes Berg 已提交
4570

J
Johannes Berg 已提交
4571
	sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4572

4573
	err = ieee80211_prep_connection(sdata, req->bss, false, false);
4574
	if (err)
J
Johannes Berg 已提交
4575
		goto err_clear;
J
Johannes Berg 已提交
4576

4577
	err = ieee80211_auth(sdata);
J
Johannes Berg 已提交
4578 4579 4580 4581 4582 4583
	if (err) {
		sta_info_destroy_addr(sdata, req->bss->bssid);
		goto err_clear;
	}

	/* hold our own reference */
4584
	cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4585
	return 0;
J
Johannes Berg 已提交
4586 4587

 err_clear:
4588
	eth_zero_addr(ifmgd->bssid);
4589
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4590
	ifmgd->auth_data = NULL;
4591 4592 4593
	mutex_lock(&sdata->local->mtx);
	ieee80211_vif_release_channel(sdata);
	mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
4594 4595 4596
 err_free:
	kfree(auth_data);
	return err;
J
Johannes Berg 已提交
4597 4598
}

4599 4600
int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
			struct cfg80211_assoc_request *req)
4601
{
J
Johannes Berg 已提交
4602
	struct ieee80211_local *local = sdata->local;
4603
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4604
	struct ieee80211_bss *bss = (void *)req->bss->priv;
J
Johannes Berg 已提交
4605
	struct ieee80211_mgd_assoc_data *assoc_data;
4606
	const struct cfg80211_bss_ies *beacon_ies;
J
Johannes Berg 已提交
4607
	struct ieee80211_supported_band *sband;
4608
	const u8 *ssidie, *ht_ie, *vht_ie;
4609
	int i, err;
4610
	bool override = false;
4611

J
Johannes Berg 已提交
4612 4613 4614 4615
	assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
	if (!assoc_data)
		return -ENOMEM;

4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626
	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();

4627 4628 4629
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

4630 4631 4632
		sdata_info(sdata,
			   "disconnect from AP %pM for new assoc to %pM\n",
			   ifmgd->associated->bssid, req->bss->bssid);
4633 4634 4635 4636
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_UNSPECIFIED,
				       false, frame_buf);

4637 4638 4639
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    WLAN_REASON_UNSPECIFIED);
4640
	}
J
Johannes Berg 已提交
4641 4642 4643 4644

	if (ifmgd->auth_data && !ifmgd->auth_data->done) {
		err = -EBUSY;
		goto err_free;
J
Johannes Berg 已提交
4645
	}
4646

J
Johannes Berg 已提交
4647 4648 4649 4650
	if (ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
	}
4651

J
Johannes Berg 已提交
4652 4653 4654 4655
	if (ifmgd->auth_data) {
		bool match;

		/* keep sta info, bssid if matching */
4656
		match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
J
Johannes Berg 已提交
4657
		ieee80211_destroy_auth_data(sdata, match);
4658 4659
	}

J
Johannes Berg 已提交
4660
	/* prepare assoc data */
4661

4662 4663
	ifmgd->beacon_crc_valid = false;

4664 4665 4666
	assoc_data->wmm = bss->wmm_used &&
			  (local->hw.queues >= IEEE80211_NUM_ACS);

J
Johannes Berg 已提交
4667 4668 4669 4670 4671 4672 4673
	/*
	 * 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.
	 */
4674
	for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4675 4676
		if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4677
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4678
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4679
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4680
			netdev_info(sdata->dev,
4681
				    "disabling HT/VHT due to WEP/TKIP use\n");
4682 4683
		}
	}
4684

J
Johannes Berg 已提交
4685 4686 4687
	/* 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 ||
4688 4689
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4690
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4691 4692
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4693 4694
			netdev_info(sdata->dev,
				    "disabling HT as WMM/QoS is not supported by the AP\n");
4695
	}
J
Johannes Berg 已提交
4696

4697 4698
	/* disable VHT if we don't support it or the AP doesn't use WMM */
	if (!sband->vht_cap.vht_supported ||
4699 4700
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4701
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4702 4703
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4704 4705
			netdev_info(sdata->dev,
				    "disabling VHT as WMM/QoS is not supported by the AP\n");
4706 4707
	}

B
Ben Greear 已提交
4708 4709 4710 4711
	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));

4712 4713 4714 4715
	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));

4716
	if (req->ie && req->ie_len) {
J
Johannes Berg 已提交
4717 4718 4719
		memcpy(assoc_data->ie, req->ie, req->ie_len);
		assoc_data->ie_len = req->ie_len;
	}
4720

4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735
	if (req->fils_kek) {
		/* should already be checked in cfg80211 - so warn */
		if (WARN_ON(req->fils_kek_len > FILS_MAX_KEK_LEN)) {
			err = -EINVAL;
			goto err_free;
		}
		memcpy(assoc_data->fils_kek, req->fils_kek,
		       req->fils_kek_len);
		assoc_data->fils_kek_len = req->fils_kek_len;
	}

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

J
Johannes Berg 已提交
4736
	assoc_data->bss = req->bss;
4737

J
Johannes Berg 已提交
4738 4739
	if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
		if (ifmgd->powersave)
4740
			sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
J
Johannes Berg 已提交
4741
		else
4742
			sdata->smps_mode = IEEE80211_SMPS_OFF;
J
Johannes Berg 已提交
4743
	} else
4744
		sdata->smps_mode = ifmgd->req_smps;
J
Johannes Berg 已提交
4745

J
Johannes Berg 已提交
4746 4747 4748
	assoc_data->capability = req->bss->capability;
	assoc_data->supp_rates = bss->supp_rates;
	assoc_data->supp_rates_len = bss->supp_rates_len;
4749

4750
	rcu_read_lock();
4751 4752 4753 4754 4755
	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
4756
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4757 4758 4759 4760 4761 4762
	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;
4763
	rcu_read_unlock();
4764

4765
	if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4766
		 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4767 4768 4769
	     "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
		sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;

K
Kalle Valo 已提交
4770
	if (bss->wmm_used && bss->uapsd_supported &&
4771
	    (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4772
		assoc_data->uapsd = true;
K
Kalle Valo 已提交
4773 4774
		ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
	} else {
4775
		assoc_data->uapsd = false;
K
Kalle Valo 已提交
4776 4777 4778
		ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
	}

4779
	if (req->prev_bssid)
J
Johannes Berg 已提交
4780
		memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4781 4782 4783 4784 4785 4786 4787 4788 4789

	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;
	}

4790 4791 4792 4793 4794
	if (req->flags & ASSOC_REQ_USE_RRM)
		ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
	else
		ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;

4795 4796 4797 4798 4799
	if (req->crypto.control_port)
		ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
	else
		ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;

4800 4801
	sdata->control_port_protocol = req->crypto.control_port_ethertype;
	sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4802 4803
	sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
							sdata->vif.type);
4804

J
Johannes Berg 已提交
4805 4806 4807
	/* kick off associate process */

	ifmgd->assoc_data = assoc_data;
4808
	ifmgd->dtim_period = 0;
4809
	ifmgd->have_beacon = false;
J
Johannes Berg 已提交
4810

4811 4812 4813 4814 4815 4816 4817 4818 4819 4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840
	/* 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);
4841 4842
	if (err)
		goto err_clear;
J
Johannes Berg 已提交
4843

4844 4845
	rcu_read_lock();
	beacon_ies = rcu_dereference(req->bss->beacon_ies);
4846

4847
	if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4848 4849 4850 4851 4852 4853 4854 4855
	    !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);
4856
		assoc_data->timeout_started = true;
4857 4858 4859 4860 4861
		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);
4862 4863
		u8 dtim_count = 0;

4864 4865 4866 4867
		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;
4868
			dtim_count = tim->dtim_count;
4869
		}
4870
		ifmgd->have_beacon = true;
J
Johannes Berg 已提交
4871
		assoc_data->timeout = jiffies;
4872
		assoc_data->timeout_started = true;
4873

4874
		if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4875 4876 4877 4878 4879
			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;
		}
4880 4881
	} else {
		assoc_data->timeout = jiffies;
4882
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
4883
	}
4884 4885
	rcu_read_unlock();

4886
	run_again(sdata, assoc_data->timeout);
J
Johannes Berg 已提交
4887

P
Paul Stewart 已提交
4888 4889 4890 4891 4892 4893 4894 4895 4896 4897
	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
4898 4899
		sdata_info(sdata, "associating with AP with corrupt %s\n",
			   corrupt_type);
P
Paul Stewart 已提交
4900 4901
	}

4902
	return 0;
J
Johannes Berg 已提交
4903
 err_clear:
4904
	eth_zero_addr(ifmgd->bssid);
4905
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4906 4907 4908 4909
	ifmgd->assoc_data = NULL;
 err_free:
	kfree(assoc_data);
	return err;
4910 4911
}

4912
int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4913
			 struct cfg80211_deauth_request *req)
4914
{
4915
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4916
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4917
	bool tx = !req->local_state_change;
4918

4919 4920 4921 4922 4923 4924
	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));
4925

4926
		drv_mgd_prepare_tx(sdata->local, sdata);
4927 4928
		ieee80211_send_deauth_disassoc(sdata, req->bssid,
					       IEEE80211_STYPE_DEAUTH,
4929
					       req->reason_code, tx,
4930
					       frame_buf);
4931
		ieee80211_destroy_auth_data(sdata, false);
4932 4933 4934
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    req->reason_code);
4935

4936
		return 0;
4937 4938
	}

4939 4940 4941 4942 4943 4944 4945 4946 4947 4948 4949 4950
	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);
4951
		ieee80211_destroy_assoc_data(sdata, false, true);
4952 4953 4954 4955 4956 4957
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    req->reason_code);
		return 0;
	}

4958 4959
	if (ifmgd->associated &&
	    ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4960 4961 4962 4963 4964
		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));

4965 4966
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       req->reason_code, tx, frame_buf);
4967 4968 4969
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    req->reason_code);
4970 4971
		return 0;
	}
4972

4973
	return -ENOTCONN;
4974
}
4975

4976
int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4977
			   struct cfg80211_disassoc_request *req)
J
Johannes Berg 已提交
4978
{
4979
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4980
	u8 bssid[ETH_ALEN];
4981
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
J
Johannes Berg 已提交
4982

J
Johannes Berg 已提交
4983 4984 4985 4986 4987 4988
	/*
	 * 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.
	 */
4989
	if (ifmgd->associated != req->bss)
4990 4991
		return -ENOLINK;

J
Johannes Berg 已提交
4992
	sdata_info(sdata,
4993 4994
		   "disassociating from %pM by local choice (Reason: %u=%s)\n",
		   req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4995

4996
	memcpy(bssid, req->bss->bssid, ETH_ALEN);
4997 4998 4999
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
			       req->reason_code, !req->local_state_change,
			       frame_buf);
5000

5001 5002
	ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
				    req->reason_code);
5003

5004 5005
	return 0;
}
5006

5007
void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5008 5009 5010
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

5011 5012 5013 5014 5015 5016 5017 5018 5019 5020
	/*
	 * 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);
5021
	cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5022

5023
	sdata_lock(sdata);
5024 5025
	if (ifmgd->assoc_data) {
		struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5026
		ieee80211_destroy_assoc_data(sdata, false, false);
5027 5028
		cfg80211_assoc_timeout(sdata->dev, bss);
	}
5029 5030
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
5031 5032 5033 5034 5035 5036 5037
	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);
5038
	del_timer_sync(&ifmgd->timer);
5039
	sdata_unlock(sdata);
5040 5041
}

5042 5043 5044 5045 5046 5047
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
5048 5049
	trace_api_cqm_rssi_notify(sdata, rssi_event);

5050 5051 5052
	cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
}
EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5053 5054 5055 5056 5057 5058 5059 5060 5061 5062

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);