util.c 43.1 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>
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#include <linux/export.h>
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#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;
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	struct ieee80211_hdr *hdr;

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	skb_queue_walk(&tx->skbs, skb) {
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		hdr = (struct ieee80211_hdr *) skb->data;
		hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
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	}
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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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void 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;
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	int queue, i;
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	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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		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);
}

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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;
534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561

	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);

562 563 564 565 566 567 568
u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
			       struct ieee802_11_elems *elems,
			       u64 filter, u32 crc)
{
	size_t left = len;
	u8 *pos = start;
	bool calc_crc = filter != 0;
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Paul Stewart 已提交
569
	DECLARE_BITMAP(seen_elems, 256);
570

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	bitmap_zero(seen_elems, 256);
572 573 574 575 576 577
	memset(elems, 0, sizeof(*elems));
	elems->ie_start = start;
	elems->total_len = len;

	while (left >= 2) {
		u8 id, elen;
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578
		bool elem_parse_failed;
579 580 581 582 583

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

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584 585
		if (elen > left) {
			elems->parse_error = true;
586
			break;
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587 588 589 590 591 592 593 594 595 596
		}

		if (id != WLAN_EID_VENDOR_SPECIFIC &&
		    id != WLAN_EID_QUIET &&
		    test_bit(id, seen_elems)) {
			elems->parse_error = true;
			left -= elen;
			pos += elen;
			continue;
		}
597 598 599 600

		if (calc_crc && id < 64 && (filter & (1ULL << id)))
			crc = crc32_be(crc, pos - 2, elen + 2);

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		elem_parse_failed = false;

603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627
		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:
			if (elen >= sizeof(struct ieee80211_tim_ie)) {
				elems->tim = (void *)pos;
				elems->tim_len = elen;
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			} else
				elem_parse_failed = true;
630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677
			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;
		case WLAN_EID_VENDOR_SPECIFIC:
			if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
			    pos[2] == 0xf2) {
				/* Microsoft OUI (00:50:F2) */

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

				if (pos[3] == 1) {
					/* OUI Type 1 - WPA IE */
					elems->wpa = pos;
					elems->wpa_len = elen;
				} else if (elen >= 5 && pos[3] == 2) {
					/* OUI Type 2 - WMM IE */
					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:
			if (elen >= sizeof(struct ieee80211_ht_cap))
				elems->ht_cap_elem = (void *)pos;
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			else
				elem_parse_failed = true;
680
			break;
681 682 683
		case WLAN_EID_HT_OPERATION:
			if (elen >= sizeof(struct ieee80211_ht_operation))
				elems->ht_operation = (void *)pos;
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			else
				elem_parse_failed = true;
686 687 688 689 690 691 692 693
			break;
		case WLAN_EID_MESH_ID:
			elems->mesh_id = pos;
			elems->mesh_id_len = elen;
			break;
		case WLAN_EID_MESH_CONFIG:
			if (elen >= sizeof(struct ieee80211_meshconf_ie))
				elems->mesh_config = (void *)pos;
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			else
				elem_parse_failed = true;
696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715
			break;
		case WLAN_EID_PEER_MGMT:
			elems->peering = pos;
			elems->peering_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;
		case WLAN_EID_RANN:
			if (elen >= sizeof(struct ieee80211_rann_ie))
				elems->rann = (void *)pos;
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			else
				elem_parse_failed = true;
718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745
			break;
		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;
		case WLAN_EID_TIMEOUT_INTERVAL:
			elems->timeout_int = pos;
			elems->timeout_int_len = elen;
			break;
		default:
			break;
		}

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746 747 748 749 750
		if (elem_parse_failed)
			elems->parse_error = true;
		else
			set_bit(id, seen_elems);

751 752 753 754
		left -= elen;
		pos += elen;
	}

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755 756 757
	if (left != 0)
		elems->parse_error = true;

758 759 760
	return crc;
}

761 762
void ieee802_11_parse_elems(u8 *start, size_t len,
			    struct ieee802_11_elems *elems)
763 764 765 766
{
	ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
}

767 768
void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
			       bool bss_notify)
769 770 771
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_tx_queue_params qparam;
772
	int ac;
773 774
	bool use_11b;
	int aCWmin, aCWmax;
775 776 777 778

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

779 780 781
	if (local->hw.queues < IEEE80211_NUM_ACS)
		return;

782 783
	memset(&qparam, 0, sizeof(qparam));

784 785
	use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
		 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
786

787
	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
788 789 790 791 792 793 794
		/* Set defaults according to 802.11-2007 Table 7-37 */
		aCWmax = 1023;
		if (use_11b)
			aCWmin = 31;
		else
			aCWmin = 15;

795
		switch (ac) {
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Johannes Berg 已提交
796
		case IEEE80211_AC_BK:
797 798
			qparam.cw_max = aCWmax;
			qparam.cw_min = aCWmin;
799 800 801 802
			qparam.txop = 0;
			qparam.aifs = 7;
			break;
		default: /* never happens but let's not leave undefined */
J
Johannes Berg 已提交
803
		case IEEE80211_AC_BE:
804 805
			qparam.cw_max = aCWmax;
			qparam.cw_min = aCWmin;
806 807 808
			qparam.txop = 0;
			qparam.aifs = 3;
			break;
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Johannes Berg 已提交
809
		case IEEE80211_AC_VI:
810 811 812 813 814 815 816 817
			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;
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Johannes Berg 已提交
818
		case IEEE80211_AC_VO:
819 820 821 822 823 824 825 826 827
			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;
		}
828

K
Kalle Valo 已提交
829 830
		qparam.uapsd = false;

831 832
		sdata->tx_conf[ac] = qparam;
		drv_conf_tx(local, sdata, ac, &qparam);
833
	}
834 835 836

	/* after reinitialize QoS TX queues setting to default,
	 * disable QoS at all */
837 838 839 840

	if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
		sdata->vif.bss_conf.qos =
			sdata->vif.type != NL80211_IFTYPE_STATION;
841 842 843
		if (bss_notify)
			ieee80211_bss_info_change_notify(sdata,
							 BSS_CHANGED_QOS);
844
	}
845
}
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Johannes Berg 已提交
846

847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864
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;

865
	ieee80211_set_wmm_default(sdata, true);
866 867
}

868
u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
869 870 871 872
			      enum ieee80211_band band)
{
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *bitrates;
873
	u32 mandatory_rates;
874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894
	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;
}
895 896 897

void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
			 u16 transaction, u16 auth_alg,
898 899
			 u8 *extra, size_t extra_len, const u8 *da,
			 const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
900 901 902 903
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
J
Johannes Berg 已提交
904
	int err;
905 906

	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
907
			    sizeof(*mgmt) + 6 + extra_len);
908
	if (!skb)
909
		return;
910

911 912 913 914 915 916
	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);
917
	memcpy(mgmt->da, da, ETH_ALEN);
918
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
919 920 921 922 923 924 925
	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);

J
Johannes Berg 已提交
926 927 928 929 930 931
	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);
	}

932 933
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
934 935
}

936
int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
937
			     const u8 *ie, size_t ie_len,
938 939
			     enum ieee80211_band band, u32 rate_mask,
			     u8 channel)
940 941
{
	struct ieee80211_supported_band *sband;
942 943 944
	u8 *pos;
	size_t offset = 0, noffset;
	int supp_rates_len, i;
945 946 947
	u8 rates[32];
	int num_rates;
	int ext_rates_len;
948

949
	sband = local->hw.wiphy->bands[band];
950 951 952

	pos = buffer;

953 954 955 956 957 958 959 960
	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);
961

962
	*pos++ = WLAN_EID_SUPP_RATES;
963
	*pos++ = supp_rates_len;
964 965
	memcpy(pos, rates, supp_rates_len);
	pos += supp_rates_len;
966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982

	/* 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;
	}

983 984
	ext_rates_len = num_rates - supp_rates_len;
	if (ext_rates_len > 0) {
985
		*pos++ = WLAN_EID_EXT_SUPP_RATES;
986 987 988
		*pos++ = ext_rates_len;
		memcpy(pos, rates + supp_rates_len, ext_rates_len);
		pos += ext_rates_len;
989 990
	}

991 992 993 994 995 996
	if (channel && sband->band == IEEE80211_BAND_2GHZ) {
		*pos++ = WLAN_EID_DS_PARAMS;
		*pos++ = 1;
		*pos++ = channel;
	}

997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012
	/* 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;
1013 1014
	}

1015
	if (sband->ht_cap.ht_supported)
B
Ben Greear 已提交
1016 1017
		pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
						sband->ht_cap.cap);
1018

1019 1020 1021 1022 1023
	/*
	 * If adding more here, adjust code in main.c
	 * that calculates local->scan_ies_len.
	 */

1024 1025 1026 1027 1028
	/* add any remaining custom IEs */
	if (ie && ie_len) {
		noffset = ie_len;
		memcpy(pos, ie + offset, noffset - offset);
		pos += noffset - offset;
1029 1030 1031 1032 1033
	}

	return pos - buffer;
}

1034
struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1035
					  u8 *dst, u32 ratemask,
1036
					  const u8 *ssid, size_t ssid_len,
1037 1038
					  const u8 *ie, size_t ie_len,
					  bool directed)
1039 1040 1041 1042
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
1043 1044
	size_t buf_len;
	u8 *buf;
1045
	u8 chan;
1046 1047 1048

	/* FIXME: come up with a proper value */
	buf = kmalloc(200 + ie_len, GFP_KERNEL);
1049
	if (!buf)
1050
		return NULL;
1051

1052 1053 1054 1055 1056 1057 1058 1059 1060 1061
	/*
	 * 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);
1062

1063
	buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1064
					   local->hw.conf.channel->band,
1065
					   ratemask, chan);
1066 1067 1068 1069

	skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
				     ssid, ssid_len,
				     buf, buf_len);
1070 1071
	if (!skb)
		goto out;
1072

1073
	if (dst) {
1074
		mgmt = (struct ieee80211_mgmt *) skb->data;
1075 1076 1077 1078
		memcpy(mgmt->da, dst, ETH_ALEN);
		memcpy(mgmt->bssid, dst, ETH_ALEN);
	}

1079
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1080 1081

 out:
1082
	kfree(buf);
1083 1084 1085 1086 1087 1088

	return skb;
}

void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
			      const u8 *ssid, size_t ssid_len,
1089
			      const u8 *ie, size_t ie_len,
1090
			      u32 ratemask, bool directed, bool no_cck)
1091 1092 1093
{
	struct sk_buff *skb;

1094 1095
	skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
					ie, ie_len, directed);
1096 1097 1098 1099
	if (skb) {
		if (no_cck)
			IEEE80211_SKB_CB(skb)->flags |=
				IEEE80211_TX_CTL_NO_CCK_RATE;
1100
		ieee80211_tx_skb(sdata, skb);
1101
	}
1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138
}

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;
}
1139

1140 1141 1142
void ieee80211_stop_device(struct ieee80211_local *local)
{
	ieee80211_led_radio(local, false);
1143
	ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1144 1145 1146 1147

	cancel_work_sync(&local->reconfig_filter);

	flush_workqueue(local->workqueue);
1148
	drv_stop(local);
1149 1150
}

1151 1152 1153 1154 1155
int ieee80211_reconfig(struct ieee80211_local *local)
{
	struct ieee80211_hw *hw = &local->hw;
	struct ieee80211_sub_if_data *sdata;
	struct sta_info *sta;
1156
	int res, i;
1157

1158
#ifdef CONFIG_PM
J
Johannes Berg 已提交
1159 1160
	if (local->suspended)
		local->resuming = true;
1161

1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177
	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
1178 1179 1180
	/* everything else happens only if HW was up & running */
	if (!local->open_count)
		goto wake_up;
1181

1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193
	/*
	 * 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;
1194 1195
	}

1196 1197 1198 1199 1200 1201 1202 1203 1204
	/* 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);

1205 1206 1207 1208
	ieee80211_led_radio(local, true);
	ieee80211_mod_tpt_led_trig(local,
				   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);

1209 1210 1211 1212
	/* add interfaces */
	list_for_each_entry(sdata, &local->interfaces, list) {
		if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
		    sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1213
		    ieee80211_sdata_running(sdata))
1214
			res = drv_add_interface(local, sdata);
1215 1216 1217
	}

	/* add STAs back */
1218 1219
	mutex_lock(&local->sta_mtx);
	list_for_each_entry(sta, &local->sta_list, list) {
J
Johannes Berg 已提交
1220 1221 1222 1223 1224 1225 1226 1227
		if (sta->uploaded) {
			enum ieee80211_sta_state state;

			for (state = IEEE80211_STA_NOTEXIST;
			     state < sta->sta_state - 1; state++)
				WARN_ON(drv_sta_state(local, sta->sdata, sta,
						      state, state + 1));
		}
1228
	}
1229
	mutex_unlock(&local->sta_mtx);
1230

1231
	/* reconfigure tx conf */
1232 1233 1234 1235 1236 1237
	if (hw->queues >= IEEE80211_NUM_ACS) {
		list_for_each_entry(sdata, &local->interfaces, list) {
			if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
			    sdata->vif.type == NL80211_IFTYPE_MONITOR ||
			    !ieee80211_sdata_running(sdata))
				continue;
1238

1239 1240 1241 1242
			for (i = 0; i < IEEE80211_NUM_ACS; i++)
				drv_conf_tx(local, sdata, i,
					    &sdata->tx_conf[i]);
		}
1243
	}
1244

1245 1246 1247 1248 1249 1250 1251
	/* 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) {
1252 1253
		u32 changed;

1254
		if (!ieee80211_sdata_running(sdata))
1255
			continue;
1256 1257 1258 1259 1260 1261 1262 1263 1264

		/* 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 |
1265
			  BSS_CHANGED_CQM |
1266 1267
			  BSS_CHANGED_QOS |
			  BSS_CHANGED_IDLE;
1268

1269 1270
		switch (sdata->vif.type) {
		case NL80211_IFTYPE_STATION:
1271 1272
			changed |= BSS_CHANGED_ASSOC |
				   BSS_CHANGED_ARP_FILTER;
1273
			mutex_lock(&sdata->u.mgd.mtx);
1274
			ieee80211_bss_info_change_notify(sdata, changed);
1275
			mutex_unlock(&sdata->u.mgd.mtx);
1276
			break;
1277
		case NL80211_IFTYPE_ADHOC:
1278 1279
			changed |= BSS_CHANGED_IBSS;
			/* fall through */
1280
		case NL80211_IFTYPE_AP:
1281 1282 1283 1284 1285
			changed |= BSS_CHANGED_SSID;

			if (sdata->vif.type == NL80211_IFTYPE_AP)
				changed |= BSS_CHANGED_AP_PROBE_RESP;

1286
			/* fall through */
1287
		case NL80211_IFTYPE_MESH_POINT:
1288 1289
			changed |= BSS_CHANGED_BEACON |
				   BSS_CHANGED_BEACON_ENABLED;
1290
			ieee80211_bss_info_change_notify(sdata, changed);
1291 1292 1293 1294 1295 1296 1297 1298
			break;
		case NL80211_IFTYPE_WDS:
			break;
		case NL80211_IFTYPE_AP_VLAN:
		case NL80211_IFTYPE_MONITOR:
			/* ignore virtual */
			break;
		case NL80211_IFTYPE_UNSPECIFIED:
1299
		case NUM_NL80211_IFTYPES:
1300 1301
		case NL80211_IFTYPE_P2P_CLIENT:
		case NL80211_IFTYPE_P2P_GO:
1302 1303 1304 1305 1306
			WARN_ON(1);
			break;
		}
	}

1307 1308
	ieee80211_recalc_ps(local, -1);

1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323
	/*
	 * The sta might be in psm against the ap (e.g. because
	 * this was the state before a hw restart), so we
	 * explicitly send a null packet in order to make sure
	 * it'll sync against the ap (and get out of psm).
	 */
	if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
		list_for_each_entry(sdata, &local->interfaces, list) {
			if (sdata->vif.type != NL80211_IFTYPE_STATION)
				continue;

			ieee80211_send_nullfunc(local, sdata, 0);
		}
	}

1324 1325 1326 1327 1328 1329 1330 1331 1332 1333
	/*
	 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
	 * sessions can be established after a resume.
	 *
	 * Also tear down aggregation sessions since reconfiguring
	 * them in a hardware restart scenario is not easily done
	 * right now, and the hardware will have lost information
	 * about the sessions, but we and the AP still think they
	 * are active. This is really a workaround though.
	 */
1334
	if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1335 1336 1337
		mutex_lock(&local->sta_mtx);

		list_for_each_entry(sta, &local->sta_list, list) {
1338
			ieee80211_sta_tear_down_BA_sessions(sta, true);
J
Johannes Berg 已提交
1339
			clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1340
		}
1341 1342

		mutex_unlock(&local->sta_mtx);
1343 1344
	}

1345 1346
	/* add back keys */
	list_for_each_entry(sdata, &local->interfaces, list)
1347
		if (ieee80211_sdata_running(sdata))
1348 1349
			ieee80211_enable_keys(sdata);

1350
 wake_up:
1351 1352 1353
	ieee80211_wake_queues_by_reason(hw,
			IEEE80211_QUEUE_STOP_REASON_SUSPEND);

1354 1355 1356 1357
	/*
	 * If this is for hw restart things are still running.
	 * We may want to change that later, however.
	 */
J
Johannes Berg 已提交
1358
	if (!local->suspended)
1359 1360 1361
		return 0;

#ifdef CONFIG_PM
J
Johannes Berg 已提交
1362
	/* first set suspended false, then resuming */
1363
	local->suspended = false;
J
Johannes Berg 已提交
1364 1365
	mb();
	local->resuming = false;
1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382

	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;
		}
	}

1383
	mod_timer(&local->sta_cleanup, jiffies + 1);
1384

1385
	mutex_lock(&local->sta_mtx);
1386 1387
	list_for_each_entry(sta, &local->sta_list, list)
		mesh_plink_restart(sta);
1388
	mutex_unlock(&local->sta_mtx);
1389 1390 1391
#else
	WARN_ON(1);
#endif
1392 1393
	return 0;
}
1394

1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421
void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_local *local;
	struct ieee80211_key *key;

	if (WARN_ON(!vif))
		return;

	sdata = vif_to_sdata(vif);
	local = sdata->local;

	if (WARN_ON(!local->resuming))
		return;

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

	sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;

	mutex_lock(&local->key_mtx);
	list_for_each_entry(key, &sdata->key_list, list)
		key->flags |= KEY_FLAG_TAINTED;
	mutex_unlock(&local->key_mtx);
}
EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);

1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441
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 */
1442
void ieee80211_recalc_smps(struct ieee80211_local *local)
1443 1444 1445 1446 1447
{
	struct ieee80211_sub_if_data *sdata;
	enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
	int count = 0;

1448
	lockdep_assert_held(&local->iflist_mtx);
1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460

	/*
	 * 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) {
1461
		if (!ieee80211_sdata_running(sdata))
1462 1463 1464
			continue;
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			goto set;
1465 1466

		count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481

		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);
}
1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537

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;
}
1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577

static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
					    int rssi_min_thold,
					    int rssi_max_thold)
{
	trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);

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

	/*
	 * Scale up threshold values before storing it, as the RSSI averaging
	 * algorithm uses a scaled up value as well. Change this scaling
	 * factor if the RSSI averaging algorithm changes.
	 */
	sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
	sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
}

void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
				    int rssi_min_thold,
				    int rssi_max_thold)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

	WARN_ON(rssi_min_thold == rssi_max_thold ||
		rssi_min_thold > rssi_max_thold);

	_ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
				       rssi_max_thold);
}
EXPORT_SYMBOL(ieee80211_enable_rssi_reports);

void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

	_ieee80211_enable_rssi_reports(sdata, 0, 0);
}
EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1578

B
Ben Greear 已提交
1579
u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593
			      u16 cap)
{
	__le16 tmp;

	*pos++ = WLAN_EID_HT_CAPABILITY;
	*pos++ = sizeof(struct ieee80211_ht_cap);
	memset(pos, 0, sizeof(struct ieee80211_ht_cap));

	/* capability flags */
	tmp = cpu_to_le16(cap);
	memcpy(pos, &tmp, sizeof(u16));
	pos += sizeof(u16);

	/* AMPDU parameters */
B
Ben Greear 已提交
1594 1595
	*pos++ = ht_cap->ampdu_factor |
		 (ht_cap->ampdu_density <<
1596 1597 1598
			IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);

	/* MCS set */
B
Ben Greear 已提交
1599 1600
	memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
	pos += sizeof(ht_cap->mcs);
1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613

	/* extended capabilities */
	pos += sizeof(__le16);

	/* BF capabilities */
	pos += sizeof(__le32);

	/* antenna selection */
	pos += sizeof(u8);

	return pos;
}

1614
u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1615 1616 1617
			       struct ieee80211_channel *channel,
			       enum nl80211_channel_type channel_type)
{
1618
	struct ieee80211_ht_operation *ht_oper;
1619
	/* Build HT Information */
1620 1621 1622 1623
	*pos++ = WLAN_EID_HT_OPERATION;
	*pos++ = sizeof(struct ieee80211_ht_operation);
	ht_oper = (struct ieee80211_ht_operation *)pos;
	ht_oper->primary_chan =
1624 1625 1626
			ieee80211_frequency_to_channel(channel->center_freq);
	switch (channel_type) {
	case NL80211_CHAN_HT40MINUS:
1627
		ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1628 1629
		break;
	case NL80211_CHAN_HT40PLUS:
1630
		ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1631 1632 1633
		break;
	case NL80211_CHAN_HT20:
	default:
1634
		ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1635 1636 1637
		break;
	}
	if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)
1638
		ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1639 1640 1641 1642 1643

	/*
	 * Note: According to 802.11n-2009 9.13.3.1, HT Protection field and
	 * RIFS Mode are reserved in IBSS mode, therefore keep them at 0
	 */
1644 1645
	ht_oper->operation_mode = 0x0000;
	ht_oper->stbc_param = 0x0000;
1646 1647 1648

	/* It seems that Basic MCS set and Supported MCS set
	   are identical for the first 10 bytes */
1649 1650
	memset(&ht_oper->basic_set, 0, 16);
	memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1651

1652
	return pos + sizeof(struct ieee80211_ht_operation);
1653 1654 1655
}

enum nl80211_channel_type
1656
ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1657 1658 1659
{
	enum nl80211_channel_type channel_type;

1660
	if (!ht_oper)
1661 1662
		return NL80211_CHAN_NO_HT;

1663
	switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679
	case IEEE80211_HT_PARAM_CHA_SEC_NONE:
		channel_type = NL80211_CHAN_HT20;
		break;
	case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
		channel_type = NL80211_CHAN_HT40PLUS;
		break;
	case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
		channel_type = NL80211_CHAN_HT40MINUS;
		break;
	default:
		channel_type = NL80211_CHAN_NO_HT;
	}

	return channel_type;
}

1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735
int ieee80211_add_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	int rate;
	u8 i, rates, *pos;

	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
	rates = sband->n_bitrates;
	if (rates > 8)
		rates = 8;

	if (skb_tailroom(skb) < rates + 2)
		return -ENOMEM;

	pos = skb_put(skb, rates + 2);
	*pos++ = WLAN_EID_SUPP_RATES;
	*pos++ = rates;
	for (i = 0; i < rates; i++) {
		rate = sband->bitrates[i].bitrate;
		*pos++ = (u8) (rate / 5);
	}

	return 0;
}

int ieee80211_add_ext_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	int rate;
	u8 i, exrates, *pos;

	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
	exrates = sband->n_bitrates;
	if (exrates > 8)
		exrates -= 8;
	else
		exrates = 0;

	if (skb_tailroom(skb) < exrates + 2)
		return -ENOMEM;

	if (exrates) {
		pos = skb_put(skb, exrates + 2);
		*pos++ = WLAN_EID_EXT_SUPP_RATES;
		*pos++ = exrates;
		for (i = 8; i < sband->n_bitrates; i++) {
			rate = sband->bitrates[i].bitrate;
			*pos++ = (u8) (rate / 5);
		}
	}
	return 0;
}