util.c 34.5 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 <linux/crc32.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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	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();
		list_for_each_entry_rcu(sdata, &local->interfaces, list)
			netif_tx_wake_queue(netdev_get_tx_queue(sdata->dev, queue));
		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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	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)
		netif_tx_stop_queue(netdev_get_tx_queue(sdata->dev, queue));
	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);
}

int ieee80211_add_pending_skbs(struct ieee80211_local *local,
			       struct sk_buff_head *skbs)
{
	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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	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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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_AFTER_LAST:
		case NL80211_IFTYPE_UNSPECIFIED:
		case NL80211_IFTYPE_MONITOR:
		case NL80211_IFTYPE_AP_VLAN:
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			continue;
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		case NL80211_IFTYPE_AP:
		case NL80211_IFTYPE_STATION:
		case NL80211_IFTYPE_ADHOC:
		case NL80211_IFTYPE_WDS:
		case NL80211_IFTYPE_MESH_POINT:
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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_AFTER_LAST:
		case NL80211_IFTYPE_UNSPECIFIED:
		case NL80211_IFTYPE_MONITOR:
		case NL80211_IFTYPE_AP_VLAN:
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			continue;
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		case NL80211_IFTYPE_AP:
		case NL80211_IFTYPE_STATION:
		case NL80211_IFTYPE_ADHOC:
		case NL80211_IFTYPE_WDS:
		case NL80211_IFTYPE_MESH_POINT:
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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;
537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564

	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);

565 566
void ieee802_11_parse_elems(u8 *start, size_t len,
			    struct ieee802_11_elems *elems)
567 568 569 570 571 572 573
{
	ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
}

u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
			       struct ieee802_11_elems *elems,
			       u64 filter, u32 crc)
574 575 576
{
	size_t left = len;
	u8 *pos = start;
577
	bool calc_crc = filter != 0;
578 579 580 581 582 583 584 585 586 587 588 589 590

	memset(elems, 0, sizeof(*elems));
	elems->ie_start = start;
	elems->total_len = len;

	while (left >= 2) {
		u8 id, elen;

		id = *pos++;
		elen = *pos++;
		left -= 2;

		if (elen > left)
591 592
			break;

593
		if (calc_crc && id < 64 && (filter & (1ULL << id)))
594
			crc = crc32_be(crc, pos - 2, elen + 2);
595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617

		switch (id) {
		case WLAN_EID_SSID:
			elems->ssid = pos;
			elems->ssid_len = elen;
			break;
		case WLAN_EID_SUPP_RATES:
			elems->supp_rates = pos;
			elems->supp_rates_len = elen;
			break;
		case WLAN_EID_FH_PARAMS:
			elems->fh_params = pos;
			elems->fh_params_len = elen;
			break;
		case WLAN_EID_DS_PARAMS:
			elems->ds_params = pos;
			elems->ds_params_len = elen;
			break;
		case WLAN_EID_CF_PARAMS:
			elems->cf_params = pos;
			elems->cf_params_len = elen;
			break;
		case WLAN_EID_TIM:
618 619 620 621
			if (elen >= sizeof(struct ieee80211_tim_ie)) {
				elems->tim = (void *)pos;
				elems->tim_len = elen;
			}
622 623 624 625 626 627 628 629 630
			break;
		case WLAN_EID_IBSS_PARAMS:
			elems->ibss_params = pos;
			elems->ibss_params_len = elen;
			break;
		case WLAN_EID_CHALLENGE:
			elems->challenge = pos;
			elems->challenge_len = elen;
			break;
631
		case WLAN_EID_VENDOR_SPECIFIC:
632 633 634
			if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
			    pos[2] == 0xf2) {
				/* Microsoft OUI (00:50:F2) */
635 636 637 638

				if (calc_crc)
					crc = crc32_be(crc, pos - 2, elen + 2);

639 640 641 642 643
				if (pos[3] == 1) {
					/* OUI Type 1 - WPA IE */
					elems->wpa = pos;
					elems->wpa_len = elen;
				} else if (elen >= 5 && pos[3] == 2) {
644
					/* OUI Type 2 - WMM IE */
645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667
					if (pos[4] == 0) {
						elems->wmm_info = pos;
						elems->wmm_info_len = elen;
					} else if (pos[4] == 1) {
						elems->wmm_param = pos;
						elems->wmm_param_len = elen;
					}
				}
			}
			break;
		case WLAN_EID_RSN:
			elems->rsn = pos;
			elems->rsn_len = elen;
			break;
		case WLAN_EID_ERP_INFO:
			elems->erp_info = pos;
			elems->erp_info_len = elen;
			break;
		case WLAN_EID_EXT_SUPP_RATES:
			elems->ext_supp_rates = pos;
			elems->ext_supp_rates_len = elen;
			break;
		case WLAN_EID_HT_CAPABILITY:
668 669
			if (elen >= sizeof(struct ieee80211_ht_cap))
				elems->ht_cap_elem = (void *)pos;
670
			break;
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		case WLAN_EID_HT_INFORMATION:
			if (elen >= sizeof(struct ieee80211_ht_info))
673
				elems->ht_info_elem = (void *)pos;
674 675 676 677 678 679
			break;
		case WLAN_EID_MESH_ID:
			elems->mesh_id = pos;
			elems->mesh_id_len = elen;
			break;
		case WLAN_EID_MESH_CONFIG:
680 681
			if (elen >= sizeof(struct ieee80211_meshconf_ie))
				elems->mesh_config = (void *)pos;
682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698
			break;
		case WLAN_EID_PEER_LINK:
			elems->peer_link = pos;
			elems->peer_link_len = elen;
			break;
		case WLAN_EID_PREQ:
			elems->preq = pos;
			elems->preq_len = elen;
			break;
		case WLAN_EID_PREP:
			elems->prep = pos;
			elems->prep_len = elen;
			break;
		case WLAN_EID_PERR:
			elems->perr = pos;
			elems->perr_len = elen;
			break;
699 700 701 702
		case WLAN_EID_RANN:
			if (elen >= sizeof(struct ieee80211_rann_ie))
				elems->rann = (void *)pos;
			break;
703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721
		case WLAN_EID_CHANNEL_SWITCH:
			elems->ch_switch_elem = pos;
			elems->ch_switch_elem_len = elen;
			break;
		case WLAN_EID_QUIET:
			if (!elems->quiet_elem) {
				elems->quiet_elem = pos;
				elems->quiet_elem_len = elen;
			}
			elems->num_of_quiet_elem++;
			break;
		case WLAN_EID_COUNTRY:
			elems->country_elem = pos;
			elems->country_elem_len = elen;
			break;
		case WLAN_EID_PWR_CONSTRAINT:
			elems->pwr_constr_elem = pos;
			elems->pwr_constr_elem_len = elen;
			break;
722 723 724
		case WLAN_EID_TIMEOUT_INTERVAL:
			elems->timeout_int = pos;
			elems->timeout_int_len = elen;
725
			break;
726 727 728 729 730 731 732
		default:
			break;
		}

		left -= elen;
		pos += elen;
	}
733 734

	return crc;
735
}
736 737 738 739 740

void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_tx_queue_params qparam;
741 742 743
	int queue;
	bool use_11b;
	int aCWmin, aCWmax;
744 745 746 747 748 749

	if (!local->ops->conf_tx)
		return;

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

750 751
	use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
		 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
752

753 754 755 756 757 758 759 760 761 762
	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 */
763 764
			qparam.cw_max = aCWmax;
			qparam.cw_min = aCWmin;
765 766 767 768 769
			qparam.txop = 0;
			qparam.aifs = 7;
			break;
		default: /* never happens but let's not leave undefined */
		case 2: /* AC_BE */
770 771
			qparam.cw_max = aCWmax;
			qparam.cw_min = aCWmin;
772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793
			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;

797 798
		drv_conf_tx(local, queue, &qparam);
	}
799 800 801 802 803

	/* after reinitialize QoS TX queues setting to default,
	 * disable QoS at all */
	local->hw.conf.flags &=	~IEEE80211_CONF_QOS;
	drv_config(local, IEEE80211_CONF_CHANGE_QOS);
804
}
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805

806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826
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);
}

827
u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
828 829 830 831
			      enum ieee80211_band band)
{
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *bitrates;
832
	u32 mandatory_rates;
833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853
	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;
}
854 855 856

void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
			 u16 transaction, u16 auth_alg,
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857 858
			 u8 *extra, size_t extra_len, const u8 *bssid,
			 const u8 *key, u8 key_len, u8 key_idx)
859 860 861 862
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
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863
	int err;
864 865

	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
866
			    sizeof(*mgmt) + 6 + extra_len);
867 868
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
869
		       "frame\n", sdata->name);
870 871 872 873 874 875 876 877 878
		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);
879
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
880 881 882 883 884 885 886
	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);
	}

893 894
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
895 896
}

897
int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
898 899
			     const u8 *ie, size_t ie_len,
			     enum ieee80211_band band)
900 901
{
	struct ieee80211_supported_band *sband;
902 903 904
	u8 *pos;
	size_t offset = 0, noffset;
	int supp_rates_len, i;
905

906
	sband = local->hw.wiphy->bands[band];
907 908 909

	pos = buffer;

910 911
	supp_rates_len = min_t(int, sband->n_bitrates, 8);

912
	*pos++ = WLAN_EID_SUPP_RATES;
913
	*pos++ = supp_rates_len;
914

915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961
	for (i = 0; i < supp_rates_len; i++) {
		int rate = sband->bitrates[i].bitrate;
		*pos++ = (u8) (rate / 5);
	}

	/* 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;
	}

	if (sband->n_bitrates > i) {
		*pos++ = WLAN_EID_EXT_SUPP_RATES;
		*pos++ = sband->n_bitrates - i;

		for (; i < sband->n_bitrates; i++) {
			int rate = sband->bitrates[i].bitrate;
			*pos++ = (u8) (rate / 5);
		}
	}

	/* 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;
962 963
	}

964
	if (sband->ht_cap.ht_supported) {
965 966 967 968 969 970 971 972
		u16 cap = sband->ht_cap.cap;
		__le16 tmp;

		if (ieee80211_disable_40mhz_24ghz &&
		    sband->band == IEEE80211_BAND_2GHZ) {
			cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
			cap &= ~IEEE80211_HT_CAP_SGI_40;
		}
973 974 975 976

		*pos++ = WLAN_EID_HT_CAPABILITY;
		*pos++ = sizeof(struct ieee80211_ht_cap);
		memset(pos, 0, sizeof(struct ieee80211_ht_cap));
977
		tmp = cpu_to_le16(cap);
978 979 980
		memcpy(pos, &tmp, sizeof(u16));
		pos += sizeof(u16);
		*pos++ = sband->ht_cap.ampdu_factor |
981 982
			 (sband->ht_cap.ampdu_density <<
				IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
983 984 985 986 987
		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 */
	}

988 989 990 991 992
	/*
	 * If adding more here, adjust code in main.c
	 * that calculates local->scan_ies_len.
	 */

993 994 995 996 997
	/* add any remaining custom IEs */
	if (ie && ie_len) {
		noffset = ie_len;
		memcpy(pos, ie + offset, noffset - offset);
		pos += noffset - offset;
998 999 1000 1001 1002
	}

	return pos - buffer;
}

1003
void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1004 1005
			      const u8 *ssid, size_t ssid_len,
			      const u8 *ie, size_t ie_len)
1006 1007 1008 1009
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
1010 1011 1012 1013 1014 1015 1016 1017
	size_t buf_len;
	u8 *buf;

	/* 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);
1018 1019 1020
		return;
	}

1021 1022 1023 1024 1025 1026 1027
	buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
					   local->hw.conf.channel->band);

	skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
				     ssid, ssid_len,
				     buf, buf_len);

1028
	if (dst) {
1029
		mgmt = (struct ieee80211_mgmt *) skb->data;
1030 1031 1032 1033
		memcpy(mgmt->da, dst, ETH_ALEN);
		memcpy(mgmt->bssid, dst, ETH_ALEN);
	}

1034 1035
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
1036
	kfree(buf);
1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073
}

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;
}
1074

1075 1076 1077 1078 1079 1080 1081
void ieee80211_stop_device(struct ieee80211_local *local)
{
	ieee80211_led_radio(local, false);

	cancel_work_sync(&local->reconfig_filter);

	flush_workqueue(local->workqueue);
1082
	drv_stop(local);
1083 1084
}

1085 1086 1087 1088 1089 1090
int ieee80211_reconfig(struct ieee80211_local *local)
{
	struct ieee80211_hw *hw = &local->hw;
	struct ieee80211_sub_if_data *sdata;
	struct sta_info *sta;
	int res;
1091

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	if (local->suspended)
		local->resuming = true;
1094 1095 1096

	/* restart hardware */
	if (local->open_count) {
1097 1098 1099 1100 1101 1102
		/*
		 * 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.
		 */
1103
		res = drv_start(local);
1104
		if (res) {
1105 1106 1107
			WARN(local->suspended, "Hardware became unavailable "
			     "upon resume. This could be a software issue "
			     "prior to suspend or a hardware issue.\n");
1108 1109
			return res;
		}
1110

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		ieee80211_led_radio(local, true);
1112 1113 1114 1115 1116 1117
	}

	/* add interfaces */
	list_for_each_entry(sdata, &local->interfaces, list) {
		if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
		    sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1118 1119
		    ieee80211_sdata_running(sdata))
			res = drv_add_interface(local, &sdata->vif);
1120 1121 1122
	}

	/* add STAs back */
1123 1124 1125
	mutex_lock(&local->sta_mtx);
	list_for_each_entry(sta, &local->sta_list, list) {
		if (sta->uploaded) {
1126
			sdata = sta->sdata;
1127 1128 1129 1130 1131
			if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
				sdata = container_of(sdata->bss,
					     struct ieee80211_sub_if_data,
					     u.ap);

1132
			WARN_ON(drv_sta_add(local, sdata, &sta->sta));
1133 1134
		}
	}
1135
	mutex_unlock(&local->sta_mtx);
1136 1137 1138 1139 1140 1141 1142

	/* Clear Suspend state so that ADDBA requests can be processed */

	rcu_read_lock();

	if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
		list_for_each_entry_rcu(sta, &local->sta_list, list) {
1143
			clear_sta_flags(sta, WLAN_STA_BLOCK_BA);
1144 1145 1146 1147 1148 1149
		}
	}

	rcu_read_unlock();

	/* setup RTS threshold */
1150
	drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1151 1152 1153 1154 1155 1156 1157 1158 1159

	/* 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) {
		u32 changed = ~0;
1160
		if (!ieee80211_sdata_running(sdata))
1161 1162 1163 1164
			continue;
		switch (sdata->vif.type) {
		case NL80211_IFTYPE_STATION:
			/* disable beacon change bits */
1165 1166
			changed &= ~(BSS_CHANGED_BEACON |
				     BSS_CHANGED_BEACON_ENABLED);
1167 1168 1169 1170
			/* fall through */
		case NL80211_IFTYPE_ADHOC:
		case NL80211_IFTYPE_AP:
		case NL80211_IFTYPE_MESH_POINT:
1171
			ieee80211_bss_info_change_notify(sdata, changed);
1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185
			break;
		case NL80211_IFTYPE_WDS:
			break;
		case NL80211_IFTYPE_AP_VLAN:
		case NL80211_IFTYPE_MONITOR:
			/* ignore virtual */
			break;
		case NL80211_IFTYPE_UNSPECIFIED:
		case __NL80211_IFTYPE_AFTER_LAST:
			WARN_ON(1);
			break;
		}
	}

1186 1187 1188 1189 1190 1191 1192 1193
	rcu_read_lock();
	if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
		list_for_each_entry_rcu(sta, &local->sta_list, list) {
			ieee80211_sta_tear_down_BA_sessions(sta);
		}
	}
	rcu_read_unlock();

1194 1195
	/* add back keys */
	list_for_each_entry(sdata, &local->interfaces, list)
1196
		if (ieee80211_sdata_running(sdata))
1197 1198 1199 1200 1201
			ieee80211_enable_keys(sdata);

	ieee80211_wake_queues_by_reason(hw,
			IEEE80211_QUEUE_STOP_REASON_SUSPEND);

1202 1203 1204 1205
	/*
	 * If this is for hw restart things are still running.
	 * We may want to change that later, however.
	 */
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	if (!local->suspended)
1207 1208 1209
		return 0;

#ifdef CONFIG_PM
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	/* first set suspended false, then resuming */
1211
	local->suspended = false;
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1212 1213
	mb();
	local->resuming = false;
1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232

	list_for_each_entry(sdata, &local->interfaces, list) {
		switch(sdata->vif.type) {
		case NL80211_IFTYPE_STATION:
			ieee80211_sta_restart(sdata);
			break;
		case NL80211_IFTYPE_ADHOC:
			ieee80211_ibss_restart(sdata);
			break;
		case NL80211_IFTYPE_MESH_POINT:
			ieee80211_mesh_restart(sdata);
			break;
		default:
			break;
		}
	}

	add_timer(&local->sta_cleanup);

1233
	mutex_lock(&local->sta_mtx);
1234 1235
	list_for_each_entry(sta, &local->sta_list, list)
		mesh_plink_restart(sta);
1236
	mutex_unlock(&local->sta_mtx);
1237 1238 1239
#else
	WARN_ON(1);
#endif
1240 1241
	return 0;
}
1242

1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316
static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
			  enum ieee80211_smps_mode *smps_mode)
{
	if (ifmgd->associated) {
		*smps_mode = ifmgd->ap_smps;

		if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
			if (ifmgd->powersave)
				*smps_mode = IEEE80211_SMPS_DYNAMIC;
			else
				*smps_mode = IEEE80211_SMPS_OFF;
		}

		return 1;
	}

	return 0;
}

/* must hold iflist_mtx */
void ieee80211_recalc_smps(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *forsdata)
{
	struct ieee80211_sub_if_data *sdata;
	enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
	int count = 0;

	if (forsdata)
		WARN_ON(!mutex_is_locked(&forsdata->u.mgd.mtx));

	WARN_ON(!mutex_is_locked(&local->iflist_mtx));

	/*
	 * This function could be improved to handle multiple
	 * interfaces better, but right now it makes any
	 * non-station interfaces force SM PS to be turned
	 * off. If there are multiple station interfaces it
	 * could also use the best possible mode, e.g. if
	 * one is in static and the other in dynamic then
	 * dynamic is ok.
	 */

	list_for_each_entry(sdata, &local->interfaces, list) {
		if (!netif_running(sdata->dev))
			continue;
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			goto set;
		if (sdata != forsdata) {
			/*
			 * This nested is ok -- we are holding the iflist_mtx
			 * so can't get here twice or so. But it's required
			 * since normally we acquire it first and then the
			 * iflist_mtx.
			 */
			mutex_lock_nested(&sdata->u.mgd.mtx, SINGLE_DEPTH_NESTING);
			count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
			mutex_unlock(&sdata->u.mgd.mtx);
		} else
			count += check_mgd_smps(&sdata->u.mgd, &smps_mode);

		if (count > 1) {
			smps_mode = IEEE80211_SMPS_OFF;
			break;
		}
	}

	if (smps_mode == local->smps_mode)
		return;

 set:
	local->smps_mode = smps_mode;
	/* changed flag is auto-detected for this */
	ieee80211_hw_config(local, 0);
}
1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372

static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
{
	int i;

	for (i = 0; i < n_ids; i++)
		if (ids[i] == id)
			return true;
	return false;
}

/**
 * ieee80211_ie_split - split an IE buffer according to ordering
 *
 * @ies: the IE buffer
 * @ielen: the length of the IE buffer
 * @ids: an array with element IDs that are allowed before
 *	the split
 * @n_ids: the size of the element ID array
 * @offset: offset where to start splitting in the buffer
 *
 * This function splits an IE buffer by updating the @offset
 * variable to point to the location where the buffer should be
 * split.
 *
 * It assumes that the given IE buffer is well-formed, this
 * has to be guaranteed by the caller!
 *
 * It also assumes that the IEs in the buffer are ordered
 * correctly, if not the result of using this function will not
 * be ordered correctly either, i.e. it does no reordering.
 *
 * The function returns the offset where the next part of the
 * buffer starts, which may be @ielen if the entire (remainder)
 * of the buffer should be used.
 */
size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
			  const u8 *ids, int n_ids, size_t offset)
{
	size_t pos = offset;

	while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
		pos += 2 + ies[pos + 1];

	return pos;
}

size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
{
	size_t pos = offset;

	while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
		pos += 2 + ies[pos + 1];

	return pos;
}