mlme.c 63 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>
 *
 * 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/rtnetlink.h>
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#include <linux/pm_qos_params.h>
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#include <linux/crc32.h>
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#include <linux/slab.h>
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#include <net/mac80211.h>
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#include <asm/unaligned.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "rate.h"
#include "led.h"
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#define IEEE80211_MAX_PROBE_TRIES 5
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/*
 * beacon loss detection timeout
 * XXX: should depend on beacon interval
 */
#define IEEE80211_BEACON_LOSS_TIME	(2 * HZ)
/*
 * 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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#define IEEE80211_PROBE_WAIT		(HZ / 2)
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/*
 * Weight given to the latest Beacon frame when calculating average signal
 * strength for Beacon frames received in the current BSS. This must be
 * between 1 and 15.
 */
#define IEEE80211_SIGNAL_AVE_WEIGHT	3

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#define TMR_RUNNING_TIMER	0
#define TMR_RUNNING_CHANSW	1

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/*
 * All cfg80211 functions have to be called outside a locked
 * section so that they can acquire a lock themselves... This
 * is much simpler than queuing up things in cfg80211, but we
 * do need some indirection for that here.
 */
enum rx_mgmt_action {
	/* no action required */
	RX_MGMT_NONE,

	/* caller must call cfg80211_send_rx_auth() */
	RX_MGMT_CFG80211_AUTH,

	/* caller must call cfg80211_send_rx_assoc() */
	RX_MGMT_CFG80211_ASSOC,

	/* caller must call cfg80211_send_deauth() */
	RX_MGMT_CFG80211_DEAUTH,

	/* caller must call cfg80211_send_disassoc() */
	RX_MGMT_CFG80211_DISASSOC,

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	/* caller must tell cfg80211 about internal error */
	RX_MGMT_CFG80211_ASSOC_ERROR,
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};

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/* utils */
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static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
{
	WARN_ON(!mutex_is_locked(&ifmgd->mtx));
}

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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.
 */
static void run_again(struct ieee80211_if_managed *ifmgd,
			     unsigned long timeout)
{
	ASSERT_MGD_MTX(ifmgd);

	if (!timer_pending(&ifmgd->timer) ||
	    time_before(timeout, ifmgd->timer.expires))
		mod_timer(&ifmgd->timer, timeout);
}

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static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
{
	if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
		return;

	mod_timer(&sdata->u.mgd.bcn_mon_timer,
		  round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_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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/*
 * ieee80211_enable_ht should be called only after the operating band
 * has been determined as ht configuration depends on the hw's
 * HT abilities for a specific band.
 */
static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
			       struct ieee80211_ht_info *hti,
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			       const u8 *bssid, u16 ap_ht_cap_flags)
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{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	struct sta_info *sta;
	u32 changed = 0;
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	u16 ht_opmode;
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	bool enable_ht = true;
	enum nl80211_channel_type prev_chantype;
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	enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;

	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

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	prev_chantype = sdata->vif.bss_conf.channel_type;

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	/* HT is not supported */
	if (!sband->ht_cap.ht_supported)
		enable_ht = false;

	/* check that channel matches the right operating channel */
	if (local->hw.conf.channel->center_freq !=
	    ieee80211_channel_to_frequency(hti->control_chan))
		enable_ht = false;

	if (enable_ht) {
		channel_type = NL80211_CHAN_HT20;

		if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
		    (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
		    (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
			switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
			case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
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				if (!(local->hw.conf.channel->flags &
				    IEEE80211_CHAN_NO_HT40PLUS))
					channel_type = NL80211_CHAN_HT40PLUS;
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				break;
			case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
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				if (!(local->hw.conf.channel->flags &
				    IEEE80211_CHAN_NO_HT40MINUS))
					channel_type = NL80211_CHAN_HT40MINUS;
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				break;
			}
		}
	}

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	if (local->tmp_channel)
		local->tmp_channel_type = channel_type;
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	if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
		/* can only fail due to HT40+/- mismatch */
		channel_type = NL80211_CHAN_HT20;
		WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
	}
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	/* channel_type change automatically detected */
	ieee80211_hw_config(local, 0);
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	if (prev_chantype != channel_type) {
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		rcu_read_lock();
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		sta = sta_info_get(sdata, bssid);
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		if (sta)
			rate_control_rate_update(local, sband, sta,
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						 IEEE80211_RC_HT_CHANGED,
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						 channel_type);
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		rcu_read_unlock();
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	}
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	ht_opmode = le16_to_cpu(hti->operation_mode);
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	/* if bss configuration changed store the new one */
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	if (sdata->ht_opmode_valid != enable_ht ||
	    sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
	    prev_chantype != channel_type) {
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		changed |= BSS_CHANGED_HT;
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		sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
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		sdata->ht_opmode_valid = enable_ht;
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	}

	return changed;
}

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/* frame sending functions */

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static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
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					   const u8 *bssid, u16 stype, u16 reason,
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					   void *cookie, bool send_frame)
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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 sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
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	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
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	if (!skb) {
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		printk(KERN_DEBUG "%s: failed to allocate buffer for "
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		       "deauth/disassoc frame\n", sdata->name);
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		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
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	memcpy(mgmt->da, bssid, ETH_ALEN);
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	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
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	memcpy(mgmt->bssid, bssid, ETH_ALEN);
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	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
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	skb_put(skb, 2);
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	/* u.deauth.reason_code == u.disassoc.reason_code */
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	mgmt->u.deauth.reason_code = cpu_to_le16(reason);

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	if (stype == IEEE80211_STYPE_DEAUTH)
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		if (cookie)
			__cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
		else
			cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
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	else
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		if (cookie)
			__cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
		else
			cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
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	if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
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	if (send_frame)
		ieee80211_tx_skb(sdata, skb);
	else
		kfree_skb(skb);
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}

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void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_pspoll *pspoll;
	struct sk_buff *skb;

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

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	pspoll = (struct ieee80211_pspoll *) skb->data;
	pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
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	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
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}

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void ieee80211_send_nullfunc(struct ieee80211_local *local,
			     struct ieee80211_sub_if_data *sdata,
			     int powersave)
{
	struct sk_buff *skb;
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	struct ieee80211_hdr_3addr *nullfunc;
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	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
	if (!skb)
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		return;

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	nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
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	if (powersave)
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		nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
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	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
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}

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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);
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
		       "nullfunc frame\n", sdata->name);
		return;
	}
	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);
}

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/* 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);
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

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	if (!ieee80211_sdata_running(sdata))
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		return;

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	mutex_lock(&ifmgd->mtx);
	if (!ifmgd->associated)
		goto out;
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	sdata->local->oper_channel = sdata->local->csa_channel;
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	if (!sdata->local->ops->channel_switch) {
		/* call "hw_config" only if doing sw channel switch */
		ieee80211_hw_config(sdata->local,
			IEEE80211_CONF_CHANGE_CHANNEL);
	}
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	/* XXX: shouldn't really modify cfg80211-owned data! */
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	ifmgd->associated->channel = sdata->local->oper_channel;
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	ieee80211_wake_queues_by_reason(&sdata->local->hw,
					IEEE80211_QUEUE_STOP_REASON_CSA);
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 out:
	ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
	mutex_unlock(&ifmgd->mtx);
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}

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void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_managed *ifmgd;

	sdata = vif_to_sdata(vif);
	ifmgd = &sdata->u.mgd;

	trace_api_chswitch_done(sdata, success);
	if (!success) {
		/*
		 * If the channel switch was not successful, stay
		 * around on the old channel. We currently lack
		 * good handling of this situation, possibly we
		 * should just drop the association.
		 */
		sdata->local->csa_channel = sdata->local->oper_channel;
	}

	ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
}
EXPORT_SYMBOL(ieee80211_chswitch_done);

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static void ieee80211_chswitch_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

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	if (sdata->local->quiescing) {
		set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
		return;
	}

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	ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
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}

void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
				      struct ieee80211_channel_sw_ie *sw_elem,
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				      struct ieee80211_bss *bss,
				      u64 timestamp)
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{
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	struct cfg80211_bss *cbss =
		container_of((void *)bss, struct cfg80211_bss, priv);
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	struct ieee80211_channel *new_ch;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);

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	ASSERT_MGD_MTX(ifmgd);

	if (!ifmgd->associated)
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		return;

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	if (sdata->local->scanning)
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		return;

	/* Disregard subsequent beacons if we are already running a timer
	   processing a CSA */

	if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
		return;

	new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
	if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
		return;

	sdata->local->csa_channel = new_ch;

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	if (sdata->local->ops->channel_switch) {
		/* use driver's channel switch callback */
		struct ieee80211_channel_switch ch_switch;
		memset(&ch_switch, 0, sizeof(ch_switch));
		ch_switch.timestamp = timestamp;
		if (sw_elem->mode) {
			ch_switch.block_tx = true;
			ieee80211_stop_queues_by_reason(&sdata->local->hw,
					IEEE80211_QUEUE_STOP_REASON_CSA);
		}
		ch_switch.channel = new_ch;
		ch_switch.count = sw_elem->count;
		ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
		drv_channel_switch(sdata->local, &ch_switch);
		return;
	}

	/* channel switch handled in software */
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	if (sw_elem->count <= 1) {
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		ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
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	} else {
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		if (sw_elem->mode)
			ieee80211_stop_queues_by_reason(&sdata->local->hw,
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					IEEE80211_QUEUE_STOP_REASON_CSA);
		ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
		mod_timer(&ifmgd->chswitch_timer,
			  jiffies +
			  msecs_to_jiffies(sw_elem->count *
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					   cbss->beacon_interval));
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	}
}

static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
					u16 capab_info, u8 *pwr_constr_elem,
					u8 pwr_constr_elem_len)
{
	struct ieee80211_conf *conf = &sdata->local->hw.conf;

	if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
		return;

	/* Power constraint IE length should be 1 octet */
	if (pwr_constr_elem_len != 1)
		return;

	if ((*pwr_constr_elem <= conf->channel->max_power) &&
	    (*pwr_constr_elem != sdata->local->power_constr_level)) {
		sdata->local->power_constr_level = *pwr_constr_elem;
		ieee80211_hw_config(sdata->local, 0);
	}
}

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

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	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
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	if (local->scanning)
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		return;

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	if (conf->dynamic_ps_timeout > 0 &&
	    !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
		mod_timer(&local->dynamic_ps_timer, jiffies +
			  msecs_to_jiffies(conf->dynamic_ps_timeout));
	} else {
		if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
			ieee80211_send_nullfunc(local, sdata, 1);
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		if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
		    (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
			return;

		conf->flags |= IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
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	}
}

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);
	}
}

/* need to hold RTNL or interface lock */
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void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
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{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;
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	int timeout;
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	if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
		local->ps_sdata = NULL;
		return;
	}

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	if (!list_empty(&local->work_list)) {
		local->ps_sdata = NULL;
		goto change;
	}

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	list_for_each_entry(sdata, &local->interfaces, list) {
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		if (!ieee80211_sdata_running(sdata))
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			continue;
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

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	if (count == 1 && found->u.mgd.powersave &&
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	    found->u.mgd.associated &&
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	    found->u.mgd.associated->beacon_ies &&
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	    !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
				    IEEE80211_STA_CONNECTION_POLL))) {
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		s32 beaconint_us;

		if (latency < 0)
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			latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
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		beaconint_us = ieee80211_tu_to_usec(
					found->vif.bss_conf.beacon_int);

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		timeout = local->dynamic_ps_forced_timeout;
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		if (timeout < 0) {
			/*
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			 * Go to full PSM if the user configures a very low
			 * latency requirement.
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			 * The 2 second value is there for compatibility until
			 * the PM_QOS_NETWORK_LATENCY is configured with real
			 * values.
			 */
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			if (latency > 1900000000 && latency != 2000000000)
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				timeout = 0;
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			else
				timeout = 100;
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		}
		local->hw.conf.dynamic_ps_timeout = timeout;

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		if (beaconint_us > latency) {
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			local->ps_sdata = NULL;
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		} else {
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			struct ieee80211_bss *bss;
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			int maxslp = 1;
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			u8 dtimper;
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			bss = (void *)found->u.mgd.associated->priv;
			dtimper = bss->dtim_period;

			/* If the TIM IE is invalid, pretend the value is 1 */
			if (!dtimper)
				dtimper = 1;
			else if (dtimper > 1)
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				maxslp = min_t(int, dtimper,
						    latency / beaconint_us);

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			local->hw.conf.max_sleep_period = maxslp;
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			local->hw.conf.ps_dtim_period = dtimper;
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			local->ps_sdata = found;
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		}
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	} else {
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		local->ps_sdata = NULL;
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	}
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	ieee80211_change_ps(local);
}

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,
					IEEE80211_QUEUE_STOP_REASON_PS);
}

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;
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	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
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	/* can only happen when PS was just disabled anyway */
	if (!sdata)
		return;

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

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	if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
	    (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
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		ieee80211_send_nullfunc(local, sdata, 1);

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	if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
	      (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
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	    (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);
	}
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}

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

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	if (local->quiescing || local->suspended)
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		return;

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

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/* MLME */
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static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
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				     struct ieee80211_if_managed *ifmgd,
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				     u8 *wmm_param, size_t wmm_param_len)
{
	struct ieee80211_tx_queue_params params;
	size_t left;
	int count;
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	u8 *pos, uapsd_queues = 0;
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	if (!local->ops->conf_tx)
		return;

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	if (local->hw.queues < 4)
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		return;

	if (!wmm_param)
		return;

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	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
		return;
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	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
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		uapsd_queues = local->uapsd_queues;
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	count = wmm_param[6] & 0x0f;
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	if (count == ifmgd->wmm_last_param_set)
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		return;
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	ifmgd->wmm_last_param_set = count;
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	pos = wmm_param + 8;
	left = wmm_param_len - 8;

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

	local->wmm_acm = 0;
	for (; left >= 4; left -= 4, pos += 4) {
		int aci = (pos[0] >> 5) & 0x03;
		int acm = (pos[0] >> 4) & 0x01;
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		bool uapsd = false;
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		int queue;

		switch (aci) {
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		case 1: /* AC_BK */
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			queue = 3;
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			if (acm)
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				local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
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			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
				uapsd = true;
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			break;
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		case 2: /* AC_VI */
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			queue = 1;
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			if (acm)
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				local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
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			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
				uapsd = true;
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			break;
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		case 3: /* AC_VO */
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			queue = 0;
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			if (acm)
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				local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
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			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
				uapsd = true;
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			break;
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		case 0: /* AC_BE */
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		default:
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			queue = 2;
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			if (acm)
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				local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
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			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
				uapsd = true;
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			break;
		}

		params.aifs = pos[0] & 0x0f;
		params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params.cw_min = ecw2cw(pos[1] & 0x0f);
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		params.txop = get_unaligned_le16(pos + 2);
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		params.uapsd = uapsd;

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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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		printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
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		       "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
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		       wiphy_name(local->hw.wiphy), queue, aci, acm,
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		       params.aifs, params.cw_min, params.cw_max, params.txop,
		       params.uapsd);
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#endif
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		if (drv_conf_tx(local, queue, &params))
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			printk(KERN_DEBUG "%s: failed to set TX queue "
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			       "parameters for queue %d\n",
			       wiphy_name(local->hw.wiphy), queue);
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	}
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	/* enable WMM or activate new settings */
	local->hw.conf.flags |=	IEEE80211_CONF_QOS;
	drv_config(local, IEEE80211_CONF_CHANGE_QOS);
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}

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static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
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{
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	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
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	u32 changed = 0;
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	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);
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	if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
		use_short_slot = true;
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	if (use_protection != bss_conf->use_cts_prot) {
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
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	}
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	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
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		changed |= BSS_CHANGED_ERP_PREAMBLE;
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	}
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	if (use_short_slot != bss_conf->use_short_slot) {
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
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	}

	return changed;
}

799
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
800
				     struct cfg80211_bss *cbss,
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				     u32 bss_info_changed)
802
{
803
	struct ieee80211_bss *bss = (void *)cbss->priv;
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	struct ieee80211_local *local = sdata->local;
805
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
806

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	bss_info_changed |= BSS_CHANGED_ASSOC;
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	/* set timing information */
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	bss_conf->beacon_int = cbss->beacon_interval;
	bss_conf->timestamp = cbss->tsf;
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	bss_info_changed |= BSS_CHANGED_BEACON_INT;
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
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		cbss->capability, bss->has_erp_value, bss->erp_value);
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	sdata->u.mgd.associated = cbss;
	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
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	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;

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	/* just to be sure */
	sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
				IEEE80211_STA_BEACON_POLL);

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	/*
	 * 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.
	 */
	sdata->u.mgd.wmm_last_param_set = -1;

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	ieee80211_led_assoc(local, 1);
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	bss_conf->assoc = 1;
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	/*
	 * For now just always ask the driver to update the basic rateset
	 * when we have associated, we aren't checking whether it actually
	 * changed or not.
	 */
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	bss_info_changed |= BSS_CHANGED_BASIC_RATES;
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	/* And the BSSID changed - we're associated now */
	bss_info_changed |= BSS_CHANGED_BSSID;

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	/* Tell the driver to monitor connection quality (if supported) */
	if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
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	    bss_conf->cqm_rssi_thold)
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		bss_info_changed |= BSS_CHANGED_CQM;

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	/* Enable ARP filtering */
	if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
		bss_conf->arp_filter_enabled = sdata->arp_filter_state;
		bss_info_changed |= BSS_CHANGED_ARP_FILTER;
	}

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	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
858

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	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
861
	ieee80211_recalc_smps(local, sdata);
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	mutex_unlock(&local->iflist_mtx);
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864
	netif_tx_start_all_queues(sdata->dev);
865
	netif_carrier_on(sdata->dev);
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}

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static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
				   bool remove_sta)
870
{
871
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
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	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;
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	u32 changed = 0, config_changed = 0;
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	u8 bssid[ETH_ALEN];
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	ASSERT_MGD_MTX(ifmgd);

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

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	memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
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	ifmgd->associated = NULL;
	memset(ifmgd->bssid, 0, ETH_ALEN);

	/*
	 * we need to commit the associated = NULL change because the
	 * scan code uses that to determine whether this iface should
	 * go to/wake up from powersave or not -- and could otherwise
	 * wake the queues erroneously.
	 */
	smp_mb();

	/*
	 * Thus, we can only afterwards stop the queues -- to account
	 * for the case where another CPU is finishing a scan at this
	 * time -- we don't want the scan code to enable queues.
	 */
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901
	netif_tx_stop_all_queues(sdata->dev);
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	netif_carrier_off(sdata->dev);

904
	mutex_lock(&local->sta_mtx);
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	sta = sta_info_get(sdata, bssid);
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	if (sta) {
907
		set_sta_flags(sta, WLAN_STA_BLOCK_BA);
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		ieee80211_sta_tear_down_BA_sessions(sta);
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	}
910
	mutex_unlock(&local->sta_mtx);
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	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
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	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
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	ieee80211_set_wmm_default(sdata);

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	/* channel(_type) changes are handled by ieee80211_hw_config */
921
	WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
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	/* on the next assoc, re-program HT parameters */
	sdata->ht_opmode_valid = false;

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	local->power_constr_level = 0;

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	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

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	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
		local->hw.conf.flags &= ~IEEE80211_CONF_PS;
		config_changed |= IEEE80211_CONF_CHANGE_PS;
	}
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936
	ieee80211_hw_config(local, config_changed);
937

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	/* Disable ARP filtering */
	if (sdata->vif.bss_conf.arp_filter_enabled) {
		sdata->vif.bss_conf.arp_filter_enabled = false;
		changed |= BSS_CHANGED_ARP_FILTER;
	}

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	/* The BSSID (not really interesting) and HT changed */
	changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
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	ieee80211_bss_info_change_notify(sdata, changed);
947

948 949
	if (remove_sta)
		sta_info_destroy_addr(sdata, bssid);
950
}
951

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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
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	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
962
	 */
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	if (is_multicast_ether_addr(hdr->addr1))
		return;

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	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
		return;

969 970
	mod_timer(&sdata->u.mgd.conn_mon_timer,
		  round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
971
}
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static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ssid;

978 979
	ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
	ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
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				 ssid + 2, ssid[1], NULL, 0);

	ifmgd->probe_send_count++;
	ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
	run_again(ifmgd, ifmgd->probe_timeout);
}

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static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
				   bool beacon)
989 990
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
991
	bool already = false;
992

993
	if (!ieee80211_sdata_running(sdata))
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		return;

996 997 998
	if (sdata->local->scanning)
		return;

999 1000 1001
	if (sdata->local->tmp_channel)
		return;

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	mutex_lock(&ifmgd->mtx);

	if (!ifmgd->associated)
		goto out;

1007
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1008 1009
	if (beacon && net_ratelimit())
		printk(KERN_DEBUG "%s: detected beacon loss from AP "
1010
		       "- sending probe request\n", sdata->name);