util.c 34.6 KB
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/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007	Johannes Berg <johannes@sipsolutions.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.
 *
 * utilities for mac80211
 */

#include <net/mac80211.h>
#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/bitmap.h>
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#include <net/net_namespace.h>
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#include <net/cfg80211.h>
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#include <net/rtnetlink.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "rate.h"
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#include "mesh.h"
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#include "wme.h"
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#include "led.h"
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#include "wep.h"
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/* privid for wiphys to determine whether they belong to us or not */
void *mac80211_wiphy_privid = &mac80211_wiphy_privid;

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struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
{
	struct ieee80211_local *local;
	BUG_ON(!wiphy);

	local = wiphy_priv(wiphy);
	return &local->hw;
}
EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
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u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
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			enum nl80211_iftype type)
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{
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	__le16 fc = hdr->frame_control;
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	 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
	if (len < 16)
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		return NULL;

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	if (ieee80211_is_data(fc)) {
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		if (len < 24) /* drop incorrect hdr len (data) */
			return NULL;
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		if (ieee80211_has_a4(fc))
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			return NULL;
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		if (ieee80211_has_tods(fc))
			return hdr->addr1;
		if (ieee80211_has_fromds(fc))
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			return hdr->addr2;
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		return hdr->addr3;
	}

	if (ieee80211_is_mgmt(fc)) {
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		if (len < 24) /* drop incorrect hdr len (mgmt) */
			return NULL;
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		return hdr->addr3;
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	}

	if (ieee80211_is_ctl(fc)) {
		if(ieee80211_is_pspoll(fc))
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			return hdr->addr1;
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		if (ieee80211_is_back_req(fc)) {
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			switch (type) {
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			case NL80211_IFTYPE_STATION:
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				return hdr->addr2;
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			case NL80211_IFTYPE_AP:
			case NL80211_IFTYPE_AP_VLAN:
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				return hdr->addr1;
			default:
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				break; /* fall through to the return */
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			}
		}
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	}

	return NULL;
}

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void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
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{
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	struct sk_buff *skb = tx->skb;
	struct ieee80211_hdr *hdr;

	do {
		hdr = (struct ieee80211_hdr *) skb->data;
		hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	} while ((skb = skb->next));
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}

int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
			     int rate, int erp, int short_preamble)
{
	int dur;

	/* calculate duration (in microseconds, rounded up to next higher
	 * integer if it includes a fractional microsecond) to send frame of
	 * len bytes (does not include FCS) at the given rate. Duration will
	 * also include SIFS.
	 *
	 * rate is in 100 kbps, so divident is multiplied by 10 in the
	 * DIV_ROUND_UP() operations.
	 */

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	if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
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		/*
		 * OFDM:
		 *
		 * N_DBPS = DATARATE x 4
		 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
		 *	(16 = SIGNAL time, 6 = tail bits)
		 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
		 *
		 * T_SYM = 4 usec
		 * 802.11a - 17.5.2: aSIFSTime = 16 usec
		 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
		 *	signal ext = 6 usec
		 */
		dur = 16; /* SIFS + signal ext */
		dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
		dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
		dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
					4 * rate); /* T_SYM x N_SYM */
	} else {
		/*
		 * 802.11b or 802.11g with 802.11b compatibility:
		 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
		 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
		 *
		 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
		 * aSIFSTime = 10 usec
		 * aPreambleLength = 144 usec or 72 usec with short preamble
		 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
		 */
		dur = 10; /* aSIFSTime = 10 usec */
		dur += short_preamble ? (72 + 24) : (144 + 48);

		dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
	}

	return dur;
}

/* Exported duration function for driver use */
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__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif,
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					size_t frame_len,
					struct ieee80211_rate *rate)
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{
	struct ieee80211_local *local = hw_to_local(hw);
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	struct ieee80211_sub_if_data *sdata;
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	u16 dur;
	int erp;
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	bool short_preamble = false;
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	erp = 0;
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	if (vif) {
		sdata = vif_to_sdata(vif);
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		short_preamble = sdata->vif.bss_conf.use_short_preamble;
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		if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
			erp = rate->flags & IEEE80211_RATE_ERP_G;
	}
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	dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
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				       short_preamble);
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	return cpu_to_le16(dur);
}
EXPORT_SYMBOL(ieee80211_generic_frame_duration);

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__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
			      struct ieee80211_vif *vif, size_t frame_len,
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			      const struct ieee80211_tx_info *frame_txctl)
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{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_rate *rate;
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	struct ieee80211_sub_if_data *sdata;
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	bool short_preamble;
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	int erp;
	u16 dur;
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	struct ieee80211_supported_band *sband;

	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
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	short_preamble = false;
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	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
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	erp = 0;
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	if (vif) {
		sdata = vif_to_sdata(vif);
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		short_preamble = sdata->vif.bss_conf.use_short_preamble;
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		if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
			erp = rate->flags & IEEE80211_RATE_ERP_G;
	}
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	/* CTS duration */
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	dur = ieee80211_frame_duration(local, 10, rate->bitrate,
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				       erp, short_preamble);
	/* Data frame duration */
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	dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
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					erp, short_preamble);
	/* ACK duration */
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	dur += ieee80211_frame_duration(local, 10, rate->bitrate,
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					erp, short_preamble);

	return cpu_to_le16(dur);
}
EXPORT_SYMBOL(ieee80211_rts_duration);

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__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
				    struct ieee80211_vif *vif,
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				    size_t frame_len,
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				    const struct ieee80211_tx_info *frame_txctl)
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{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_rate *rate;
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	struct ieee80211_sub_if_data *sdata;
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	bool short_preamble;
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	int erp;
	u16 dur;
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	struct ieee80211_supported_band *sband;

	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
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	short_preamble = false;
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	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
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	erp = 0;
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	if (vif) {
		sdata = vif_to_sdata(vif);
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		short_preamble = sdata->vif.bss_conf.use_short_preamble;
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		if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
			erp = rate->flags & IEEE80211_RATE_ERP_G;
	}
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	/* Data frame duration */
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	dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
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				       erp, short_preamble);
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	if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
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		/* ACK duration */
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		dur += ieee80211_frame_duration(local, 10, rate->bitrate,
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						erp, short_preamble);
	}

	return cpu_to_le16(dur);
}
EXPORT_SYMBOL(ieee80211_ctstoself_duration);

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static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
				   enum queue_stop_reason reason)
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{
	struct ieee80211_local *local = hw_to_local(hw);
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	struct ieee80211_sub_if_data *sdata;
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	trace_wake_queue(local, queue, reason);

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	if (WARN_ON(queue >= hw->queues))
		return;
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	__clear_bit(reason, &local->queue_stop_reasons[queue]);

	if (local->queue_stop_reasons[queue] != 0)
		/* someone still has this queue stopped */
		return;

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	if (skb_queue_empty(&local->pending[queue])) {
		rcu_read_lock();
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		list_for_each_entry_rcu(sdata, &local->interfaces, list) {
			if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
				continue;
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			netif_wake_subqueue(sdata->dev, queue);
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		}
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		rcu_read_unlock();
	} else
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		tasklet_schedule(&local->tx_pending_tasklet);
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}
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void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
				    enum queue_stop_reason reason)
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{
	struct ieee80211_local *local = hw_to_local(hw);
	unsigned long flags;

	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	__ieee80211_wake_queue(hw, queue, reason);
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
}

void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
{
	ieee80211_wake_queue_by_reason(hw, queue,
				       IEEE80211_QUEUE_STOP_REASON_DRIVER);
}
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EXPORT_SYMBOL(ieee80211_wake_queue);

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static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
				   enum queue_stop_reason reason)
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{
	struct ieee80211_local *local = hw_to_local(hw);
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	struct ieee80211_sub_if_data *sdata;
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	trace_stop_queue(local, queue, reason);

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	if (WARN_ON(queue >= hw->queues))
		return;
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	__set_bit(reason, &local->queue_stop_reasons[queue]);
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	rcu_read_lock();
	list_for_each_entry_rcu(sdata, &local->interfaces, list)
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		netif_stop_subqueue(sdata->dev, queue);
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	rcu_read_unlock();
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}
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void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
				    enum queue_stop_reason reason)
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{
	struct ieee80211_local *local = hw_to_local(hw);
	unsigned long flags;

	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	__ieee80211_stop_queue(hw, queue, reason);
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
}

void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
{
	ieee80211_stop_queue_by_reason(hw, queue,
				       IEEE80211_QUEUE_STOP_REASON_DRIVER);
}
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EXPORT_SYMBOL(ieee80211_stop_queue);

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void ieee80211_add_pending_skb(struct ieee80211_local *local,
			       struct sk_buff *skb)
{
	struct ieee80211_hw *hw = &local->hw;
	unsigned long flags;
	int queue = skb_get_queue_mapping(skb);
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	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

	if (WARN_ON(!info->control.vif)) {
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		kfree_skb(skb);
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		return;
	}
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	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	__ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
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	__skb_queue_tail(&local->pending[queue], skb);
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	__ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
}

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int ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
				  struct sk_buff_head *skbs,
				  void (*fn)(void *data), void *data)
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{
	struct ieee80211_hw *hw = &local->hw;
	struct sk_buff *skb;
	unsigned long flags;
	int queue, ret = 0, i;

	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	for (i = 0; i < hw->queues; i++)
		__ieee80211_stop_queue(hw, i,
			IEEE80211_QUEUE_STOP_REASON_SKB_ADD);

	while ((skb = skb_dequeue(skbs))) {
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		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

		if (WARN_ON(!info->control.vif)) {
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			kfree_skb(skb);
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			continue;
		}

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		ret++;
		queue = skb_get_queue_mapping(skb);
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		__skb_queue_tail(&local->pending[queue], skb);
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	}

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	if (fn)
		fn(data);

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	for (i = 0; i < hw->queues; i++)
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		__ieee80211_wake_queue(hw, i,
			IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);

	return ret;
}

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int ieee80211_add_pending_skbs(struct ieee80211_local *local,
			       struct sk_buff_head *skbs)
{
	return ieee80211_add_pending_skbs_fn(local, skbs, NULL, NULL);
}

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void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
				    enum queue_stop_reason reason)
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{
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	struct ieee80211_local *local = hw_to_local(hw);
	unsigned long flags;
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	int i;

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	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);

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	for (i = 0; i < hw->queues; i++)
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		__ieee80211_stop_queue(hw, i, reason);

	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
}

void ieee80211_stop_queues(struct ieee80211_hw *hw)
{
	ieee80211_stop_queues_by_reason(hw,
					IEEE80211_QUEUE_STOP_REASON_DRIVER);
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}
EXPORT_SYMBOL(ieee80211_stop_queues);

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int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
{
	struct ieee80211_local *local = hw_to_local(hw);
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	unsigned long flags;
	int ret;
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	if (WARN_ON(queue >= hw->queues))
		return true;
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	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	ret = !!local->queue_stop_reasons[queue];
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
	return ret;
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}
EXPORT_SYMBOL(ieee80211_queue_stopped);

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void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
				     enum queue_stop_reason reason)
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{
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	struct ieee80211_local *local = hw_to_local(hw);
	unsigned long flags;
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	int i;

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	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);

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	for (i = 0; i < hw->queues; i++)
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		__ieee80211_wake_queue(hw, i, reason);

	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
}

void ieee80211_wake_queues(struct ieee80211_hw *hw)
{
	ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
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}
EXPORT_SYMBOL(ieee80211_wake_queues);
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void ieee80211_iterate_active_interfaces(
	struct ieee80211_hw *hw,
	void (*iterator)(void *data, u8 *mac,
			 struct ieee80211_vif *vif),
	void *data)
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{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_sub_if_data *sdata;

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	mutex_lock(&local->iflist_mtx);
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	list_for_each_entry(sdata, &local->interfaces, list) {
		switch (sdata->vif.type) {
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		case NL80211_IFTYPE_MONITOR:
		case NL80211_IFTYPE_AP_VLAN:
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			continue;
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		default:
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			break;
		}
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		if (ieee80211_sdata_running(sdata))
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			iterator(data, sdata->vif.addr,
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				 &sdata->vif);
	}

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	mutex_unlock(&local->iflist_mtx);
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}
EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);

void ieee80211_iterate_active_interfaces_atomic(
	struct ieee80211_hw *hw,
	void (*iterator)(void *data, u8 *mac,
			 struct ieee80211_vif *vif),
	void *data)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_sub_if_data *sdata;

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	rcu_read_lock();
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	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
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		switch (sdata->vif.type) {
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		case NL80211_IFTYPE_MONITOR:
		case NL80211_IFTYPE_AP_VLAN:
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			continue;
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		default:
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			break;
		}
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		if (ieee80211_sdata_running(sdata))
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			iterator(data, sdata->vif.addr,
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				 &sdata->vif);
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	}
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	rcu_read_unlock();
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}
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EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
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/*
 * Nothing should have been stuffed into the workqueue during
 * the suspend->resume cycle. If this WARN is seen then there
 * is a bug with either the driver suspend or something in
 * mac80211 stuffing into the workqueue which we haven't yet
 * cleared during mac80211's suspend cycle.
 */
static bool ieee80211_can_queue_work(struct ieee80211_local *local)
{
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	if (WARN(local->suspended && !local->resuming,
		 "queueing ieee80211 work while going to suspend\n"))
		return false;
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	return true;
}

void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
{
	struct ieee80211_local *local = hw_to_local(hw);

	if (!ieee80211_can_queue_work(local))
		return;

	queue_work(local->workqueue, work);
}
EXPORT_SYMBOL(ieee80211_queue_work);

void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
				  struct delayed_work *dwork,
				  unsigned long delay)
{
	struct ieee80211_local *local = hw_to_local(hw);

	if (!ieee80211_can_queue_work(local))
		return;

	queue_delayed_work(local->workqueue, dwork, delay);
}
EXPORT_SYMBOL(ieee80211_queue_delayed_work);

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void ieee802_11_parse_elems(u8 *start, size_t len,
			    struct ieee802_11_elems *elems)
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{
	ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
}

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void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_tx_queue_params qparam;
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	int queue;
	bool use_11b;
	int aCWmin, aCWmax;
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	if (!local->ops->conf_tx)
		return;

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

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	use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
		 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
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	for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
		/* Set defaults according to 802.11-2007 Table 7-37 */
		aCWmax = 1023;
		if (use_11b)
			aCWmin = 31;
		else
			aCWmin = 15;

		switch (queue) {
		case 3: /* AC_BK */
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			qparam.cw_max = aCWmax;
			qparam.cw_min = aCWmin;
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			qparam.txop = 0;
			qparam.aifs = 7;
			break;
		default: /* never happens but let's not leave undefined */
		case 2: /* AC_BE */
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			qparam.cw_max = aCWmax;
			qparam.cw_min = aCWmin;
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			qparam.txop = 0;
			qparam.aifs = 3;
			break;
		case 1: /* AC_VI */
			qparam.cw_max = aCWmin;
			qparam.cw_min = (aCWmin + 1) / 2 - 1;
			if (use_11b)
				qparam.txop = 6016/32;
			else
				qparam.txop = 3008/32;
			qparam.aifs = 2;
			break;
		case 0: /* AC_VO */
			qparam.cw_max = (aCWmin + 1) / 2 - 1;
			qparam.cw_min = (aCWmin + 1) / 4 - 1;
			if (use_11b)
				qparam.txop = 3264/32;
			else
				qparam.txop = 1504/32;
			qparam.aifs = 2;
			break;
		}
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		qparam.uapsd = false;

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		local->tx_conf[queue] = qparam;
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		drv_conf_tx(local, queue, &qparam);
	}
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	/* after reinitialize QoS TX queues setting to default,
	 * disable QoS at all */
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	if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
		sdata->vif.bss_conf.qos =
			sdata->vif.type != NL80211_IFTYPE_STATION;
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
	}
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}
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void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
				  const size_t supp_rates_len,
				  const u8 *supp_rates)
{
	struct ieee80211_local *local = sdata->local;
	int i, have_higher_than_11mbit = 0;

	/* cf. IEEE 802.11 9.2.12 */
	for (i = 0; i < supp_rates_len; i++)
		if ((supp_rates[i] & 0x7f) * 5 > 110)
			have_higher_than_11mbit = 1;

	if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
	    have_higher_than_11mbit)
		sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
	else
		sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

	ieee80211_set_wmm_default(sdata);
}

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u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
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			      enum ieee80211_band band)
{
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *bitrates;
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	u32 mandatory_rates;
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	enum ieee80211_rate_flags mandatory_flag;
	int i;

	sband = local->hw.wiphy->bands[band];
	if (!sband) {
		WARN_ON(1);
		sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
	}

	if (band == IEEE80211_BAND_2GHZ)
		mandatory_flag = IEEE80211_RATE_MANDATORY_B;
	else
		mandatory_flag = IEEE80211_RATE_MANDATORY_A;

	bitrates = sband->bitrates;
	mandatory_rates = 0;
	for (i = 0; i < sband->n_bitrates; i++)
		if (bitrates[i].flags & mandatory_flag)
			mandatory_rates |= BIT(i);
	return mandatory_rates;
}
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void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
			 u16 transaction, u16 auth_alg,
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			 u8 *extra, size_t extra_len, const u8 *bssid,
			 const u8 *key, u8 key_len, u8 key_idx)
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{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
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	int err;
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	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
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			    sizeof(*mgmt) + 6 + extra_len);
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	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
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		       "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 + 6);
	memset(mgmt, 0, 24 + 6);
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_AUTH);
	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);
	mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
	mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
	mgmt->u.auth.status_code = cpu_to_le16(0);
	if (extra)
		memcpy(skb_put(skb, extra_len), extra, extra_len);

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	if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
		mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
		err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
		WARN_ON(err);
	}

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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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int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
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			     const u8 *ie, size_t ie_len,
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			     enum ieee80211_band band, u32 rate_mask,
			     u8 channel)
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{
	struct ieee80211_supported_band *sband;
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	u8 *pos;
	size_t offset = 0, noffset;
	int supp_rates_len, i;
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	u8 rates[32];
	int num_rates;
	int ext_rates_len;
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	sband = local->hw.wiphy->bands[band];
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	pos = buffer;

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	num_rates = 0;
	for (i = 0; i < sband->n_bitrates; i++) {
		if ((BIT(i) & rate_mask) == 0)
			continue; /* skip rate */
		rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
	}

	supp_rates_len = min_t(int, num_rates, 8);
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	*pos++ = WLAN_EID_SUPP_RATES;
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	*pos++ = supp_rates_len;
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	memcpy(pos, rates, supp_rates_len);
	pos += supp_rates_len;
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	/* insert "request information" if in custom IEs */
	if (ie && ie_len) {
		static const u8 before_extrates[] = {
			WLAN_EID_SSID,
			WLAN_EID_SUPP_RATES,
			WLAN_EID_REQUEST,
		};
		noffset = ieee80211_ie_split(ie, ie_len,
					     before_extrates,
					     ARRAY_SIZE(before_extrates),
					     offset);
		memcpy(pos, ie + offset, noffset - offset);
		pos += noffset - offset;
		offset = noffset;
	}

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	ext_rates_len = num_rates - supp_rates_len;
	if (ext_rates_len > 0) {
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		*pos++ = WLAN_EID_EXT_SUPP_RATES;
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		*pos++ = ext_rates_len;
		memcpy(pos, rates + supp_rates_len, ext_rates_len);
		pos += ext_rates_len;
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	}

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	if (channel && sband->band == IEEE80211_BAND_2GHZ) {
		*pos++ = WLAN_EID_DS_PARAMS;
		*pos++ = 1;
		*pos++ = channel;
	}

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	/* insert custom IEs that go before HT */
	if (ie && ie_len) {
		static const u8 before_ht[] = {
			WLAN_EID_SSID,
			WLAN_EID_SUPP_RATES,
			WLAN_EID_REQUEST,
			WLAN_EID_EXT_SUPP_RATES,
			WLAN_EID_DS_PARAMS,
			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
		};
		noffset = ieee80211_ie_split(ie, ie_len,
					     before_ht, ARRAY_SIZE(before_ht),
					     offset);
		memcpy(pos, ie + offset, noffset - offset);
		pos += noffset - offset;
		offset = noffset;
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	}

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	if (sband->ht_cap.ht_supported) {
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		u16 cap = sband->ht_cap.cap;
		__le16 tmp;

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		*pos++ = WLAN_EID_HT_CAPABILITY;
		*pos++ = sizeof(struct ieee80211_ht_cap);
		memset(pos, 0, sizeof(struct ieee80211_ht_cap));
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		tmp = cpu_to_le16(cap);
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		memcpy(pos, &tmp, sizeof(u16));
		pos += sizeof(u16);
		*pos++ = sband->ht_cap.ampdu_factor |
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			 (sband->ht_cap.ampdu_density <<
				IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
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		memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
		pos += sizeof(sband->ht_cap.mcs);
		pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
	}

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	/*
	 * If adding more here, adjust code in main.c
	 * that calculates local->scan_ies_len.
	 */

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	/* add any remaining custom IEs */
	if (ie && ie_len) {
		noffset = ie_len;
		memcpy(pos, ie + offset, noffset - offset);
		pos += noffset - offset;
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	}

	return pos - buffer;
}

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struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
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					  u8 *dst, u32 ratemask,
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					  const u8 *ssid, size_t ssid_len,
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					  const u8 *ie, size_t ie_len,
					  bool directed)
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{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
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	size_t buf_len;
	u8 *buf;
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	u8 chan;
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	/* FIXME: come up with a proper value */
	buf = kmalloc(200 + ie_len, GFP_KERNEL);
	if (!buf) {
		printk(KERN_DEBUG "%s: failed to allocate temporary IE "
		       "buffer\n", sdata->name);
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		return NULL;
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	}

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	/*
	 * Do not send DS Channel parameter for directed probe requests
	 * in order to maximize the chance that we get a response.  Some
	 * badly-behaved APs don't respond when this parameter is included.
	 */
	if (directed)
		chan = 0;
	else
		chan = ieee80211_frequency_to_channel(
			local->hw.conf.channel->center_freq);
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	buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
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					   local->hw.conf.channel->band,
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					   ratemask, chan);
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	skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
				     ssid, ssid_len,
				     buf, buf_len);

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	if (dst) {
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		mgmt = (struct ieee80211_mgmt *) skb->data;
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		memcpy(mgmt->da, dst, ETH_ALEN);
		memcpy(mgmt->bssid, dst, ETH_ALEN);
	}

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	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
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	kfree(buf);
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	return skb;
}

void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
			      const u8 *ssid, size_t ssid_len,
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			      const u8 *ie, size_t ie_len,
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			      u32 ratemask, bool directed)
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{
	struct sk_buff *skb;

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	skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
					ie, ie_len, directed);
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	if (skb)
		ieee80211_tx_skb(sdata, skb);
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}

u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
			    struct ieee802_11_elems *elems,
			    enum ieee80211_band band)
{
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *bitrates;
	size_t num_rates;
	u32 supp_rates;
	int i, j;
	sband = local->hw.wiphy->bands[band];

	if (!sband) {
		WARN_ON(1);
		sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
	}

	bitrates = sband->bitrates;
	num_rates = sband->n_bitrates;
	supp_rates = 0;
	for (i = 0; i < elems->supp_rates_len +
		     elems->ext_supp_rates_len; i++) {
		u8 rate = 0;
		int own_rate;
		if (i < elems->supp_rates_len)
			rate = elems->supp_rates[i];
		else if (elems->ext_supp_rates)
			rate = elems->ext_supp_rates
				[i - elems->supp_rates_len];
		own_rate = 5 * (rate & 0x7f);
		for (j = 0; j < num_rates; j++)
			if (bitrates[j].bitrate == own_rate)
				supp_rates |= BIT(j);
	}
	return supp_rates;
}
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void ieee80211_stop_device(struct ieee80211_local *local)
{
	ieee80211_led_radio(local, false);
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	ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
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	cancel_work_sync(&local->reconfig_filter);

	flush_workqueue(local->workqueue);
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	drv_stop(local);
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}

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int ieee80211_reconfig(struct ieee80211_local *local)
{
	struct ieee80211_hw *hw = &local->hw;
	struct ieee80211_sub_if_data *sdata;
	struct sta_info *sta;
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	int res, i;
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#ifdef CONFIG_PM
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	if (local->suspended)
		local->resuming = true;
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	if (local->wowlan) {
		local->wowlan = false;
		res = drv_resume(local);
		if (res < 0) {
			local->resuming = false;
			return res;
		}
		if (res == 0)
			goto wake_up;
		WARN_ON(res > 1);
		/*
		 * res is 1, which means the driver requested
		 * to go through a regular reset on wakeup.
		 */
	}
#endif

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	/* setup fragmentation threshold */
	drv_set_frag_threshold(local, hw->wiphy->frag_threshold);

	/* setup RTS threshold */
	drv_set_rts_threshold(local, hw->wiphy->rts_threshold);

	/* reset coverage class */
	drv_set_coverage_class(local, hw->wiphy->coverage_class);

	/* everything else happens only if HW was up & running */
	if (!local->open_count)
		goto wake_up;
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	/*
	 * Upon resume hardware can sometimes be goofy due to
	 * various platform / driver / bus issues, so restarting
	 * the device may at times not work immediately. Propagate
	 * the error.
	 */
	res = drv_start(local);
	if (res) {
		WARN(local->suspended, "Hardware became unavailable "
		     "upon resume. This could be a software issue "
		     "prior to suspend or a hardware issue.\n");
		return res;
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	}

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	ieee80211_led_radio(local, true);
	ieee80211_mod_tpt_led_trig(local,
				   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);

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	/* add interfaces */
	list_for_each_entry(sdata, &local->interfaces, list) {
		if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
		    sdata->vif.type != NL80211_IFTYPE_MONITOR &&
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		    ieee80211_sdata_running(sdata))
			res = drv_add_interface(local, &sdata->vif);
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	}

	/* add STAs back */
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	mutex_lock(&local->sta_mtx);
	list_for_each_entry(sta, &local->sta_list, list) {
		if (sta->uploaded) {
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			sdata = sta->sdata;
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			if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
				sdata = container_of(sdata->bss,
					     struct ieee80211_sub_if_data,
					     u.ap);

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			memset(&sta->sta.drv_priv, 0, hw->sta_data_size);
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			WARN_ON(drv_sta_add(local, sdata, &sta->sta));
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		}
	}
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	mutex_unlock(&local->sta_mtx);
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	/* reconfigure tx conf */
	for (i = 0; i < hw->queues; i++)
		drv_conf_tx(local, i, &local->tx_conf[i]);

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	/* reconfigure hardware */
	ieee80211_hw_config(local, ~0);

	ieee80211_configure_filter(local);

	/* Finally also reconfigure all the BSS information */
	list_for_each_entry(sdata, &local->interfaces, list) {
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		u32 changed;

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		if (!ieee80211_sdata_running(sdata))
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			continue;
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		/* common change flags for all interface types */
		changed = BSS_CHANGED_ERP_CTS_PROT |
			  BSS_CHANGED_ERP_PREAMBLE |
			  BSS_CHANGED_ERP_SLOT |
			  BSS_CHANGED_HT |
			  BSS_CHANGED_BASIC_RATES |
			  BSS_CHANGED_BEACON_INT |
			  BSS_CHANGED_BSSID |
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			  BSS_CHANGED_CQM |
			  BSS_CHANGED_QOS;
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		switch (sdata->vif.type) {
		case NL80211_IFTYPE_STATION:
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			changed |= BSS_CHANGED_ASSOC;
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			mutex_lock(&sdata->u.mgd.mtx);
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			ieee80211_bss_info_change_notify(sdata, changed);
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			mutex_unlock(&sdata->u.mgd.mtx);
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			break;
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		case NL80211_IFTYPE_ADHOC:
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			changed |= BSS_CHANGED_IBSS;
			/* fall through */
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		case NL80211_IFTYPE_AP:
		case NL80211_IFTYPE_MESH_POINT:
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			changed |= BSS_CHANGED_BEACON |
				   BSS_CHANGED_BEACON_ENABLED;
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			ieee80211_bss_info_change_notify(sdata, changed);
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			break;
		case NL80211_IFTYPE_WDS:
			break;
		case NL80211_IFTYPE_AP_VLAN:
		case NL80211_IFTYPE_MONITOR:
			/* ignore virtual */
			break;
		case NL80211_IFTYPE_UNSPECIFIED:
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		case NUM_NL80211_IFTYPES:
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		case NL80211_IFTYPE_P2P_CLIENT:
		case NL80211_IFTYPE_P2P_GO:
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