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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 <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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#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, ht_changed;
	enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;

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

	/* 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;
			}
		}
	}

	ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
		     channel_type != local->hw.conf.channel_type;

	local->oper_channel_type = channel_type;

	if (ht_changed) {
                /* channel_type change automatically detected */
		ieee80211_hw_config(local, 0);

		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,
						 local->oper_channel_type);
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		rcu_read_unlock();
        }

	/* disable HT */
	if (!enable_ht)
		return 0;

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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 ||
	    sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
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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 = true;
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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,
					   void *cookie)
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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;
	ieee80211_tx_skb(sdata, 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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	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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	ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
	mutex_unlock(&ifmgd->mtx);
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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,
				      struct ieee80211_bss *bss)
{
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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;

	if (sw_elem->count <= 1) {
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		ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
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	} else {
		ieee80211_stop_queues_by_reason(&sdata->local->hw,
					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_REPORTS_TX_ACK_STATUS)) {
			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;

	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)
			latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);

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

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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) ||
	    (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->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;
597 598

	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
599
		uapsd_queues = local->uapsd_queues;
600

601
	count = wmm_param[6] & 0x0f;
602
	if (count == ifmgd->wmm_last_param_set)
603
		return;
604
	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;
615
		bool uapsd = false;
616 617 618
		int queue;

		switch (aci) {
619
		case 1: /* AC_BK */
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			queue = 3;
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621
			if (acm)
622
				local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
623 624
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
				uapsd = true;
625
			break;
626
		case 2: /* AC_VI */
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			queue = 1;
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			if (acm)
629
				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;
632
			break;
633
		case 3: /* AC_VO */
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			queue = 0;
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			if (acm)
636
				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;
639
			break;
640
		case 0: /* AC_BE */
641
		default:
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642
			queue = 2;
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			if (acm)
644
				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;

656
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
657
		printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
658
		       "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
659
		       wiphy_name(local->hw.wiphy), queue, aci, acm,
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		       params.aifs, params.cw_min, params.cw_max, params.txop,
		       params.uapsd);
662
#endif
663
		if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
664
			printk(KERN_DEBUG "%s: failed to set TX queue "
665 666
			       "parameters for queue %d\n",
			       wiphy_name(local->hw.wiphy), queue);
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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)
672
{
673
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
674
	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);
688 689
	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;
694
	}
695

696 697
	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
698
		changed |= BSS_CHANGED_ERP_PREAMBLE;
699
	}
700

701 702 703
	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;
}

709
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
710
				     struct cfg80211_bss *cbss,
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711
				     u32 bss_info_changed)
712
{
713
	struct ieee80211_bss *bss = (void *)cbss->priv;
714
	struct ieee80211_local *local = sdata->local;
715

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	bss_info_changed |= BSS_CHANGED_ASSOC;
717
	/* set timing information */
718 719
	sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
	sdata->vif.bss_conf.timestamp = cbss->tsf;
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721 722
	bss_info_changed |= BSS_CHANGED_BEACON_INT;
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
723
		cbss->capability, bss->has_erp_value, bss->erp_value);
724

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	sdata->u.mgd.associated = cbss;
	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
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728 729 730 731
	/* just to be sure */
	sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
				IEEE80211_STA_BEACON_POLL);

732 733 734 735 736 737 738 739
	/*
	 * 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;

740
	ieee80211_led_assoc(local, 1);
741

742
	sdata->vif.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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748
	bss_info_changed |= BSS_CHANGED_BASIC_RATES;
749 750 751 752

	/* And the BSSID changed - we're associated now */
	bss_info_changed |= BSS_CHANGED_BSSID;

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	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
754

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755 756
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
757
	ieee80211_recalc_smps(local, sdata);
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758
	mutex_unlock(&local->iflist_mtx);
759

760
	netif_tx_start_all_queues(sdata->dev);
761
	netif_carrier_on(sdata->dev);
762 763
}

764
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
765
{
766
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
767 768
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;
769
	u32 changed = 0, config_changed = 0;
770
	u8 bssid[ETH_ALEN];
771

772 773
	ASSERT_MGD_MTX(ifmgd);

774 775 776
	if (WARN_ON(!ifmgd->associated))
		return;

777
	memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
778

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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.
	 */
795

796
	netif_tx_stop_all_queues(sdata->dev);
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	netif_carrier_off(sdata->dev);

799
	rcu_read_lock();
800
	sta = sta_info_get(sdata, bssid);
801 802
	if (sta) {
		set_sta_flags(sta, WLAN_STA_DISASSOC);
803
		ieee80211_sta_tear_down_BA_sessions(sta);
804
	}
805
	rcu_read_unlock();
806

807 808 809
	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;
812

813 814
	ieee80211_set_wmm_default(sdata);

815
	/* channel(_type) changes are handled by ieee80211_hw_config */
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	local->oper_channel_type = NL80211_CHAN_NO_HT;
817

818 819 820
	/* on the next assoc, re-program HT parameters */
	sdata->ht_opmode_valid = false;

821 822
	local->power_constr_level = 0;

823 824 825
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

826 827 828 829
	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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830

831
	ieee80211_hw_config(local, config_changed);
832 833 834

	/* And the BSSID changed -- not very interesting here */
	changed |= BSS_CHANGED_BSSID;
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	ieee80211_bss_info_change_notify(sdata, changed);
836

837
	sta_info_destroy_addr(sdata, bssid);
838
}
839

840 841 842 843 844 845 846 847
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
848 849
	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
850
	 */
851 852 853
	if (is_multicast_ether_addr(hdr->addr1))
		return;

854 855 856
	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
		return;

857 858
	mod_timer(&sdata->u.mgd.conn_mon_timer,
		  round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
859
}
860

861 862 863 864 865
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ssid;

866 867
	ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
	ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
868 869 870 871 872 873 874
				 ssid + 2, ssid[1], NULL, 0);

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

875 876
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
				   bool beacon)
877 878
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
879
	bool already = false;
880

881
	if (!ieee80211_sdata_running(sdata))
882 883
		return;

884 885 886
	if (sdata->local->scanning)
		return;

887 888 889
	if (sdata->local->tmp_channel)
		return;

890 891 892 893 894
	mutex_lock(&ifmgd->mtx);

	if (!ifmgd->associated)
		goto out;

895
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
896 897
	if (beacon && net_ratelimit())
		printk(KERN_DEBUG "%s: detected beacon loss from AP "
898
		       "- sending probe request\n", sdata->name);
899
#endif
900

901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923
	/*
	 * 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!
	 */
	if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
			    IEEE80211_STA_CONNECTION_POLL))
		already = true;

	if (beacon)
		ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
	else
		ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;

	if (already)
		goto out;

924 925 926 927
	mutex_lock(&sdata->local->iflist_mtx);
	ieee80211_recalc_ps(sdata->local, -1);
	mutex_unlock(&sdata->local->iflist_mtx);

928 929
	ifmgd->probe_send_count = 0;
	ieee80211_mgd_probe_ap_send(sdata);
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 out:
	mutex_unlock(&ifmgd->mtx);
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}

934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963
static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_local *local = sdata->local;
	u8 bssid[ETH_ALEN];

	mutex_lock(&ifmgd->mtx);
	if (!ifmgd->associated) {
		mutex_unlock(&ifmgd->mtx);
		return;
	}

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

	printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);

	ieee80211_set_disassoc(sdata);
	ieee80211_recalc_idle(local);
	mutex_unlock(&ifmgd->mtx);
	/*
	 * must be outside lock due to cfg80211,
	 * but that's not a problem.
	 */
	ieee80211_send_deauth_disassoc(sdata, bssid,
				       IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
				       NULL);
}

void ieee80211_beacon_connection_loss_work(struct work_struct *work)
964 965 966
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
967
			     u.mgd.beacon_connection_loss_work);
968

969 970 971 972
	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
		__ieee80211_connection_loss(sdata);
	else
		ieee80211_mgd_probe_ap(sdata, true);
973 974
}

975 976 977
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
978
	struct ieee80211_hw *hw = &sdata->local->hw;
979

980 981
	WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
982 983 984
}
EXPORT_SYMBOL(ieee80211_beacon_loss);

985 986 987 988 989 990 991 992 993 994 995
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;

	WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_connection_loss);


996 997 998
static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
			 struct ieee80211_mgmt *mgmt, size_t len)
999
{
1000
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1001
	const u8 *bssid = NULL;
1002 1003
	u16 reason_code;

1004
	if (len < 24 + 2)
1005
		return RX_MGMT_NONE;
1006

1007 1008
	ASSERT_MGD_MTX(ifmgd);

1009
	bssid = ifmgd->associated->bssid;
1010 1011 1012

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

1013
	printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1014
			sdata->name, bssid, reason_code);
1015

1016 1017
	ieee80211_set_disassoc(sdata);
	ieee80211_recalc_idle(sdata->local);
1018

1019
	return RX_MGMT_CFG80211_DEAUTH;
1020 1021 1022
}


1023 1024 1025
static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
			   struct ieee80211_mgmt *mgmt, size_t len)
1026
{
1027
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1028 1029
	u16 reason_code;

1030
	if (len < 24 + 2)
1031
		return RX_MGMT_NONE;
1032

1033 1034 1035 1036 1037
	ASSERT_MGD_MTX(ifmgd);

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

1038
	if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1039
		return RX_MGMT_NONE;
1040 1041 1042

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

1043
	printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1044
			sdata->name, mgmt->sa, reason_code);
1045

1046
	ieee80211_set_disassoc(sdata);
1047
	ieee80211_recalc_idle(sdata->local);
1048
	return RX_MGMT_CFG80211_DISASSOC;
1049 1050 1051
}


1052 1053
static bool ieee80211_assoc_success(struct ieee80211_work *wk,
				    struct ieee80211_mgmt *mgmt, size_t len)
1054
{
1055
	struct ieee80211_sub_if_data *sdata = wk->sdata;
1056
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1057
	struct ieee80211_local *local = sdata->local;
1058
	struct ieee80211_supported_band *sband;
1059
	struct sta_info *sta;
1060
	struct cfg80211_bss *cbss = wk->assoc.bss;
1061
	u8 *pos;
1062
	u32 rates, basic_rates;
1063
	u16 capab_info, aid;
1064
	struct ieee802_11_elems elems;
1065
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
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	u32 changed = 0;
1067 1068
	int i, j, err;
	bool have_higher_than_11mbit = false;
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	u16 ap_ht_cap_flags;
1070

1071
	/* AssocResp and ReassocResp have identical structure */
1072 1073

	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1074
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1075

1076 1077
	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
		printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1078
		       "set\n", sdata->name, aid);
1079 1080
	aid &= ~(BIT(15) | BIT(14));

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	pos = mgmt->u.assoc_resp.variable;
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);

1084 1085
	if (!elems.supp_rates) {
		printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1086
		       sdata->name);
1087
		return false;
1088 1089
	}

1090
	ifmgd->aid = aid;
1091

1092
	sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1093
	if (!sta) {
1094 1095
		printk(KERN_DEBUG "%s: failed to alloc STA entry for"
		       " the AP\n", sdata->name);
1096
		return false;
1097
	}
1098

1099 1100 1101 1102 1103
	set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
			   WLAN_STA_ASSOC_AP);
	if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
		set_sta_flags(sta, WLAN_STA_AUTHORIZED);

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	rates = 0;
	basic_rates = 0;
	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1107

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	for (i = 0; i < elems.supp_rates_len; i++) {
		int rate = (elems.supp_rates[i] & 0x7f) * 5;
1110
		bool is_basic = !!(elems.supp_rates[i] & 0x80);
1111

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		if (rate > 110)
			have_higher_than_11mbit = true;

		for (j = 0; j < sband->n_bitrates; j++) {
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			if (sband->bitrates[j].bitrate == rate) {
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				rates |= BIT(j);
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				if (is_basic)
					basic_rates |= BIT(j);
				break;
			}
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		}
	}