[deliverable/linux.git] / net / mac80211 / util.c

/*
 * 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/wireless.h>
#include <linux/bitmap.h>
#include <net/net_namespace.h>
#include <net/cfg80211.h>
#include <net/rtnetlink.h>

#include "ieee80211_i.h"
#include "rate.h"
#include "mesh.h"
#include "wme.h"

/* privid for wiphys to determine whether they belong to us or not */
void *mac80211_wiphy_privid = &mac80211_wiphy_privid;

/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
const unsigned char rfc1042_header[] __aligned(2) =
	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };

/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
const unsigned char bridge_tunnel_header[] __aligned(2) =
	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };


u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
			enum ieee80211_if_types type)
{
	__le16 fc = hdr->frame_control;

	 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
	if (len < 16)
		return NULL;

	if (ieee80211_is_data(fc)) {
		if (len < 24) /* drop incorrect hdr len (data) */
			return NULL;

		if (ieee80211_has_a4(fc))
			return NULL;
		if (ieee80211_has_tods(fc))
			return hdr->addr1;
		if (ieee80211_has_fromds(fc))
			return hdr->addr2;

		return hdr->addr3;
	}

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

	if (ieee80211_is_ctl(fc)) {
		if(ieee80211_is_pspoll(fc))
			return hdr->addr1;

		if (ieee80211_is_back_req(fc)) {
			switch (type) {
			case IEEE80211_IF_TYPE_STA:
				return hdr->addr2;
			case IEEE80211_IF_TYPE_AP:
			case IEEE80211_IF_TYPE_VLAN:
				return hdr->addr1;
			default:
				break; /* fall through to the return */
			}
		}
	}

	return NULL;
}

int ieee80211_get_hdrlen(u16 fc)
{
	int hdrlen = 24;

	switch (fc & IEEE80211_FCTL_FTYPE) {
	case IEEE80211_FTYPE_DATA:
		if ((fc & IEEE80211_FCTL_FROMDS) && (fc & IEEE80211_FCTL_TODS))
			hdrlen = 30; /* Addr4 */
		/*
		 * The QoS Control field is two bytes and its presence is
		 * indicated by the IEEE80211_STYPE_QOS_DATA bit. Add 2 to
		 * hdrlen if that bit is set.
		 * This works by masking out the bit and shifting it to
		 * bit position 1 so the result has the value 0 or 2.
		 */
		hdrlen += (fc & IEEE80211_STYPE_QOS_DATA)
				>> (ilog2(IEEE80211_STYPE_QOS_DATA)-1);
		break;
	case IEEE80211_FTYPE_CTL:
		/*
		 * ACK and CTS are 10 bytes, all others 16. To see how
		 * to get this condition consider
		 *   subtype mask:   0b0000000011110000 (0x00F0)
		 *   ACK subtype:    0b0000000011010000 (0x00D0)
		 *   CTS subtype:    0b0000000011000000 (0x00C0)
		 *   bits that matter:         ^^^      (0x00E0)
		 *   value of those: 0b0000000011000000 (0x00C0)
		 */
		if ((fc & 0xE0) == 0xC0)
			hdrlen = 10;
		else
			hdrlen = 16;
		break;
	}

	return hdrlen;
}
EXPORT_SYMBOL(ieee80211_get_hdrlen);

unsigned int ieee80211_hdrlen(__le16 fc)
{
	unsigned int hdrlen = 24;

	if (ieee80211_is_data(fc)) {
		if (ieee80211_has_a4(fc))
			hdrlen = 30;
		if (ieee80211_is_data_qos(fc))
			hdrlen += IEEE80211_QOS_CTL_LEN;
		goto out;
	}

	if (ieee80211_is_ctl(fc)) {
		/*
		 * ACK and CTS are 10 bytes, all others 16. To see how
		 * to get this condition consider
		 *   subtype mask:   0b0000000011110000 (0x00F0)
		 *   ACK subtype:    0b0000000011010000 (0x00D0)
		 *   CTS subtype:    0b0000000011000000 (0x00C0)
		 *   bits that matter:         ^^^      (0x00E0)
		 *   value of those: 0b0000000011000000 (0x00C0)
		 */
		if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
			hdrlen = 10;
		else
			hdrlen = 16;
	}
out:
	return hdrlen;
}
EXPORT_SYMBOL(ieee80211_hdrlen);

unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
{
	const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)skb->data;
	unsigned int hdrlen;

	if (unlikely(skb->len < 10))
		return 0;
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	if (unlikely(hdrlen > skb->len))
		return 0;
	return hdrlen;
}
EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);

int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
{
	int ae = meshhdr->flags & IEEE80211S_FLAGS_AE;
	/* 7.1.3.5a.2 */
	switch (ae) {
	case 0:
		return 6;
	case 1:
		return 12;
	case 2:
		return 18;
	case 3:
		return 24;
	default:
		return 6;
	}
}

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

	hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	if (tx->extra_frag) {
		struct ieee80211_hdr *fhdr;
		int i;
		for (i = 0; i < tx->num_extra_frag; i++) {
			fhdr = (struct ieee80211_hdr *)
				tx->extra_frag[i]->data;
			fhdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
		}
	}
}

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.
	 */

	if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
		/*
		 * 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 */
__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif,
					size_t frame_len,
					struct ieee80211_rate *rate)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	u16 dur;
	int erp;

	erp = 0;
	if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
		erp = rate->flags & IEEE80211_RATE_ERP_G;

	dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
				       sdata->bss_conf.use_short_preamble);

	return cpu_to_le16(dur);
}
EXPORT_SYMBOL(ieee80211_generic_frame_duration);

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

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

	short_preamble = sdata->bss_conf.use_short_preamble;

	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];

	erp = 0;
	if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
		erp = rate->flags & IEEE80211_RATE_ERP_G;

	/* CTS duration */
	dur = ieee80211_frame_duration(local, 10, rate->bitrate,
				       erp, short_preamble);
	/* Data frame duration */
	dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
					erp, short_preamble);
	/* ACK duration */
	dur += ieee80211_frame_duration(local, 10, rate->bitrate,
					erp, short_preamble);

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

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

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

	short_preamble = sdata->bss_conf.use_short_preamble;

	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
	erp = 0;
	if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
		erp = rate->flags & IEEE80211_RATE_ERP_G;

	/* Data frame duration */
	dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
				       erp, short_preamble);
	if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
		/* ACK duration */
		dur += ieee80211_frame_duration(local, 10, rate->bitrate,
						erp, short_preamble);
	}

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

void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
{
	struct ieee80211_local *local = hw_to_local(hw);

	if (test_bit(queue, local->queues_pending)) {
		tasklet_schedule(&local->tx_pending_tasklet);
	} else {
		netif_wake_subqueue(local->mdev, queue);
	}
}
EXPORT_SYMBOL(ieee80211_wake_queue);

void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
{
	struct ieee80211_local *local = hw_to_local(hw);

	netif_stop_subqueue(local->mdev, queue);
}
EXPORT_SYMBOL(ieee80211_stop_queue);

void ieee80211_stop_queues(struct ieee80211_hw *hw)
{
	int i;

	for (i = 0; i < ieee80211_num_queues(hw); i++)
		ieee80211_stop_queue(hw, i);
}
EXPORT_SYMBOL(ieee80211_stop_queues);

void ieee80211_wake_queues(struct ieee80211_hw *hw)
{
	int i;

	for (i = 0; i < hw->queues + hw->ampdu_queues; i++)
		ieee80211_wake_queue(hw, i);
}
EXPORT_SYMBOL(ieee80211_wake_queues);

void ieee80211_iterate_active_interfaces(
	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;

	rtnl_lock();

	list_for_each_entry(sdata, &local->interfaces, list) {
		switch (sdata->vif.type) {
		case IEEE80211_IF_TYPE_INVALID:
		case IEEE80211_IF_TYPE_MNTR:
		case IEEE80211_IF_TYPE_VLAN:
			continue;
		case IEEE80211_IF_TYPE_AP:
		case IEEE80211_IF_TYPE_STA:
		case IEEE80211_IF_TYPE_IBSS:
		case IEEE80211_IF_TYPE_WDS:
		case IEEE80211_IF_TYPE_MESH_POINT:
			break;
		}
		if (netif_running(sdata->dev))
			iterator(data, sdata->dev->dev_addr,
				 &sdata->vif);
	}

	rtnl_unlock();
}
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;

	rcu_read_lock();

	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		switch (sdata->vif.type) {
		case IEEE80211_IF_TYPE_INVALID:
		case IEEE80211_IF_TYPE_MNTR:
		case IEEE80211_IF_TYPE_VLAN:
			continue;
		case IEEE80211_IF_TYPE_AP:
		case IEEE80211_IF_TYPE_STA:
		case IEEE80211_IF_TYPE_IBSS:
		case IEEE80211_IF_TYPE_WDS:
		case IEEE80211_IF_TYPE_MESH_POINT:
			break;
		}
		if (netif_running(sdata->dev))
			iterator(data, sdata->dev->dev_addr,
				 &sdata->vif);
	}

	rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
Commit	Line	Data
c2d1560a JB	1	/*
	2	* Copyright 2002-2005, Instant802 Networks, Inc.
	3	* Copyright 2005-2006, Devicescape Software, Inc.
	4	* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
	5	* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* utilities for mac80211
	12	*/
	13
	14	#include <net/mac80211.h>
	15	#include <linux/netdevice.h>
	16	#include <linux/types.h>
	17	#include <linux/slab.h>
	18	#include <linux/skbuff.h>
	19	#include <linux/etherdevice.h>
	20	#include <linux/if_arp.h>
	21	#include <linux/wireless.h>
	22	#include <linux/bitmap.h>
881d966b	23	#include <net/net_namespace.h>
c2d1560a	24	#include <net/cfg80211.h>
dabeb344	25	#include <net/rtnetlink.h>
c2d1560a JB	26
c2d1560a JB	27	#include "ieee80211_i.h"
2c8dccc7	28	#include "rate.h"
ee385855	29	#include "mesh.h"
c2d1560a JB	30	#include "wme.h"
	31
	32	/* privid for wiphys to determine whether they belong to us or not */
	33	void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
	34
	35	/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
	36	/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
c97c23e3	37	const unsigned char rfc1042_header[] __aligned(2) =
c2d1560a JB	38	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
	39
	40	/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
c97c23e3	41	const unsigned char bridge_tunnel_header[] __aligned(2) =
c2d1560a JB	42	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
c2d1560a JB	43
c2d1560a	44
71364716 RR	45	u8 ieee80211_get_bssid(struct ieee80211_hdr hdr, size_t len,
71364716 RR	46	enum ieee80211_if_types type)
c2d1560a	47	{
a494bb1c	48	__le16 fc = hdr->frame_control;
c2d1560a	49
98f0b0a3 RR	50	/* drop ACK/CTS frames and incorrect hdr len (ctrl) */
98f0b0a3 RR	51	if (len < 16)
c2d1560a JB	52	return NULL;
c2d1560a JB	53
a494bb1c	54	if (ieee80211_is_data(fc)) {
98f0b0a3 RR	55	if (len < 24) /* drop incorrect hdr len (data) */
98f0b0a3 RR	56	return NULL;
a494bb1c HH	57
a494bb1c HH	58	if (ieee80211_has_a4(fc))
c2d1560a	59	return NULL;
a494bb1c HH	60	if (ieee80211_has_tods(fc))
	61	return hdr->addr1;
	62	if (ieee80211_has_fromds(fc))
c2d1560a	63	return hdr->addr2;
a494bb1c HH	64
	65	return hdr->addr3;
	66	}
	67
	68	if (ieee80211_is_mgmt(fc)) {
98f0b0a3 RR	69	if (len < 24) /* drop incorrect hdr len (mgmt) */
98f0b0a3 RR	70	return NULL;
c2d1560a	71	return hdr->addr3;
a494bb1c HH	72	}
	73
	74	if (ieee80211_is_ctl(fc)) {
	75	if(ieee80211_is_pspoll(fc))
c2d1560a	76	return hdr->addr1;
a494bb1c HH	77
a494bb1c HH	78	if (ieee80211_is_back_req(fc)) {
71364716 RR	79	switch (type) {
	80	case IEEE80211_IF_TYPE_STA:
	81	return hdr->addr2;
	82	case IEEE80211_IF_TYPE_AP:
	83	case IEEE80211_IF_TYPE_VLAN:
	84	return hdr->addr1;
	85	default:
a494bb1c	86	break; /* fall through to the return */
71364716 RR	87	}
71364716 RR	88	}
c2d1560a JB	89	}
	90
	91	return NULL;
	92	}
	93
	94	int ieee80211_get_hdrlen(u16 fc)
	95	{
	96	int hdrlen = 24;
	97
	98	switch (fc & IEEE80211_FCTL_FTYPE) {
	99	case IEEE80211_FTYPE_DATA:
	100	if ((fc & IEEE80211_FCTL_FROMDS) && (fc & IEEE80211_FCTL_TODS))
	101	hdrlen = 30; /* Addr4 */
	102	/*
	103	* The QoS Control field is two bytes and its presence is
	104	* indicated by the IEEE80211_STYPE_QOS_DATA bit. Add 2 to
	105	* hdrlen if that bit is set.
	106	* This works by masking out the bit and shifting it to
	107	* bit position 1 so the result has the value 0 or 2.
	108	*/
	109	hdrlen += (fc & IEEE80211_STYPE_QOS_DATA)
	110	>> (ilog2(IEEE80211_STYPE_QOS_DATA)-1);
	111	break;
	112	case IEEE80211_FTYPE_CTL:
	113	/*
	114	* ACK and CTS are 10 bytes, all others 16. To see how
	115	* to get this condition consider
	116	* subtype mask: 0b0000000011110000 (0x00F0)
	117	* ACK subtype: 0b0000000011010000 (0x00D0)
	118	* CTS subtype: 0b0000000011000000 (0x00C0)
	119	* bits that matter: ^^^ (0x00E0)
	120	* value of those: 0b0000000011000000 (0x00C0)
	121	*/
	122	if ((fc & 0xE0) == 0xC0)
	123	hdrlen = 10;
	124	else
	125	hdrlen = 16;
	126	break;
	127	}
	128
	129	return hdrlen;
	130	}
	131	EXPORT_SYMBOL(ieee80211_get_hdrlen);
	132
6693be71 HH	133	unsigned int ieee80211_hdrlen(__le16 fc)
	134	{
	135	unsigned int hdrlen = 24;
	136
	137	if (ieee80211_is_data(fc)) {
	138	if (ieee80211_has_a4(fc))
	139	hdrlen = 30;
	140	if (ieee80211_is_data_qos(fc))
	141	hdrlen += IEEE80211_QOS_CTL_LEN;
	142	goto out;
	143	}
	144
	145	if (ieee80211_is_ctl(fc)) {
	146	/*
	147	* ACK and CTS are 10 bytes, all others 16. To see how
	148	* to get this condition consider
	149	* subtype mask: 0b0000000011110000 (0x00F0)
	150	* ACK subtype: 0b0000000011010000 (0x00D0)
	151	* CTS subtype: 0b0000000011000000 (0x00C0)
	152	* bits that matter: ^^^ (0x00E0)
	153	* value of those: 0b0000000011000000 (0x00C0)
	154	*/
	155	if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
	156	hdrlen = 10;
	157	else
	158	hdrlen = 16;
	159	}
	160	out:
	161	return hdrlen;
	162	}
	163	EXPORT_SYMBOL(ieee80211_hdrlen);
	164
c9c6950c	165	unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
c2d1560a	166	{
c9c6950c HH	167	const struct ieee80211_hdr hdr = (const struct ieee80211_hdr )skb->data;
c9c6950c HH	168	unsigned int hdrlen;
c2d1560a JB	169
	170	if (unlikely(skb->len < 10))
	171	return 0;
c9c6950c	172	hdrlen = ieee80211_hdrlen(hdr->frame_control);
c2d1560a JB	173	if (unlikely(hdrlen > skb->len))
	174	return 0;
	175	return hdrlen;
	176	}
	177	EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
	178
ee385855 LCC	179	int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
	180	{
	181	int ae = meshhdr->flags & IEEE80211S_FLAGS_AE;
	182	/* 7.1.3.5a.2 */
	183	switch (ae) {
	184	case 0:
ef269254	185	return 6;
ee385855	186	case 1:
ef269254	187	return 12;
ee385855	188	case 2:
ef269254	189	return 18;
ee385855	190	case 3:
ef269254	191	return 24;
ee385855	192	default:
ef269254	193	return 6;
ee385855 LCC	194	}
ee385855 LCC	195	}
ee385855	196
5cf121c3	197	void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
c2d1560a JB	198	{
	199	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) tx->skb->data;
	200
	201	hdr->frame_control \|= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
5cf121c3	202	if (tx->extra_frag) {
c2d1560a JB	203	struct ieee80211_hdr *fhdr;
c2d1560a JB	204	int i;
5cf121c3	205	for (i = 0; i < tx->num_extra_frag; i++) {
c2d1560a	206	fhdr = (struct ieee80211_hdr *)
5cf121c3	207	tx->extra_frag[i]->data;
c2d1560a JB	208	fhdr->frame_control \|= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	209	}
	210	}
	211	}
	212
	213	int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
	214	int rate, int erp, int short_preamble)
	215	{
	216	int dur;
	217
	218	/* calculate duration (in microseconds, rounded up to next higher
	219	* integer if it includes a fractional microsecond) to send frame of
	220	* len bytes (does not include FCS) at the given rate. Duration will
	221	* also include SIFS.
	222	*
	223	* rate is in 100 kbps, so divident is multiplied by 10 in the
	224	* DIV_ROUND_UP() operations.
	225	*/
	226
8318d78a	227	if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ \|\| erp) {
c2d1560a JB	228	/*
	229	* OFDM:
	230	*
	231	* N_DBPS = DATARATE x 4
	232	* N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
	233	* (16 = SIGNAL time, 6 = tail bits)
	234	* TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
	235	*
	236	* T_SYM = 4 usec
	237	* 802.11a - 17.5.2: aSIFSTime = 16 usec
	238	* 802.11g - 19.8.4: aSIFSTime = 10 usec +
	239	* signal ext = 6 usec
	240	*/
c2d1560a JB	241	dur = 16; /* SIFS + signal ext */
	242	dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
	243	dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
	244	dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
	245	4 * rate); /* T_SYM x N_SYM */
	246	} else {
	247	/*
	248	* 802.11b or 802.11g with 802.11b compatibility:
	249	* 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
	250	* Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
	251	*
	252	* 802.11 (DS): 15.3.3, 802.11b: 18.3.4
	253	* aSIFSTime = 10 usec
	254	* aPreambleLength = 144 usec or 72 usec with short preamble
	255	* aPLCPHeaderLength = 48 usec or 24 usec with short preamble
	256	*/
	257	dur = 10; /* aSIFSTime = 10 usec */
	258	dur += short_preamble ? (72 + 24) : (144 + 48);
	259
	260	dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
	261	}
	262
	263	return dur;
	264	}
	265
	266	/* Exported duration function for driver use */
32bfd35d JB	267	__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
32bfd35d JB	268	struct ieee80211_vif *vif,
8318d78a JB	269	size_t frame_len,
8318d78a JB	270	struct ieee80211_rate *rate)
c2d1560a JB	271	{
c2d1560a JB	272	struct ieee80211_local *local = hw_to_local(hw);
32bfd35d	273	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
c2d1560a JB	274	u16 dur;
	275	int erp;
	276
8318d78a JB	277	erp = 0;
	278	if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
	279	erp = rate->flags & IEEE80211_RATE_ERP_G;
	280
	281	dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
471b3efd	282	sdata->bss_conf.use_short_preamble);
c2d1560a JB	283
	284	return cpu_to_le16(dur);
	285	}
	286	EXPORT_SYMBOL(ieee80211_generic_frame_duration);
	287
32bfd35d JB	288	__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
32bfd35d JB	289	struct ieee80211_vif *vif, size_t frame_len,
e039fa4a	290	const struct ieee80211_tx_info *frame_txctl)
c2d1560a JB	291	{
	292	struct ieee80211_local *local = hw_to_local(hw);
	293	struct ieee80211_rate *rate;
32bfd35d	294	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
471b3efd	295	bool short_preamble;
c2d1560a JB	296	int erp;
c2d1560a JB	297	u16 dur;
2e92e6f2 JB	298	struct ieee80211_supported_band *sband;
	299
	300	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
c2d1560a	301
471b3efd	302	short_preamble = sdata->bss_conf.use_short_preamble;
7e9ed188	303
e039fa4a	304	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
8318d78a JB	305
	306	erp = 0;
	307	if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
	308	erp = rate->flags & IEEE80211_RATE_ERP_G;
c2d1560a JB	309
c2d1560a JB	310	/* CTS duration */
8318d78a	311	dur = ieee80211_frame_duration(local, 10, rate->bitrate,
c2d1560a JB	312	erp, short_preamble);
c2d1560a JB	313	/* Data frame duration */
8318d78a	314	dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
c2d1560a JB	315	erp, short_preamble);
c2d1560a JB	316	/* ACK duration */
8318d78a	317	dur += ieee80211_frame_duration(local, 10, rate->bitrate,
c2d1560a JB	318	erp, short_preamble);
	319
	320	return cpu_to_le16(dur);
	321	}
	322	EXPORT_SYMBOL(ieee80211_rts_duration);
	323
32bfd35d JB	324	__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
32bfd35d JB	325	struct ieee80211_vif *vif,
c2d1560a	326	size_t frame_len,
e039fa4a	327	const struct ieee80211_tx_info *frame_txctl)
c2d1560a JB	328	{
	329	struct ieee80211_local *local = hw_to_local(hw);
	330	struct ieee80211_rate *rate;
32bfd35d	331	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
471b3efd	332	bool short_preamble;
c2d1560a JB	333	int erp;
c2d1560a JB	334	u16 dur;
2e92e6f2 JB	335	struct ieee80211_supported_band *sband;
	336
	337	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
c2d1560a	338
471b3efd	339	short_preamble = sdata->bss_conf.use_short_preamble;
7e9ed188	340
e039fa4a	341	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
8318d78a JB	342	erp = 0;
	343	if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
	344	erp = rate->flags & IEEE80211_RATE_ERP_G;
c2d1560a JB	345
c2d1560a JB	346	/* Data frame duration */
8318d78a	347	dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
c2d1560a	348	erp, short_preamble);
e039fa4a	349	if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
c2d1560a	350	/* ACK duration */
8318d78a	351	dur += ieee80211_frame_duration(local, 10, rate->bitrate,
c2d1560a JB	352	erp, short_preamble);
	353	}
	354
	355	return cpu_to_le16(dur);
	356	}
	357	EXPORT_SYMBOL(ieee80211_ctstoself_duration);
	358
c2d1560a JB	359	void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
	360	{
	361	struct ieee80211_local *local = hw_to_local(hw);
	362
e2530083 JB	363	if (test_bit(queue, local->queues_pending)) {
	364	tasklet_schedule(&local->tx_pending_tasklet);
	365	} else {
51cb6db0	366	netif_wake_subqueue(local->mdev, queue);
c2d1560a JB	367	}
	368	}
	369	EXPORT_SYMBOL(ieee80211_wake_queue);
	370
	371	void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
	372	{
	373	struct ieee80211_local *local = hw_to_local(hw);
	374
51cb6db0	375	netif_stop_subqueue(local->mdev, queue);
c2d1560a JB	376	}
	377	EXPORT_SYMBOL(ieee80211_stop_queue);
	378
c2d1560a JB	379	void ieee80211_stop_queues(struct ieee80211_hw *hw)
	380	{
	381	int i;
	382
e2530083	383	for (i = 0; i < ieee80211_num_queues(hw); i++)
c2d1560a JB	384	ieee80211_stop_queue(hw, i);
	385	}
	386	EXPORT_SYMBOL(ieee80211_stop_queues);
	387
	388	void ieee80211_wake_queues(struct ieee80211_hw *hw)
	389	{
	390	int i;
	391
c4680470	392	for (i = 0; i < hw->queues + hw->ampdu_queues; i++)
c2d1560a JB	393	ieee80211_wake_queue(hw, i);
	394	}
	395	EXPORT_SYMBOL(ieee80211_wake_queues);
dabeb344	396
32bfd35d JB	397	void ieee80211_iterate_active_interfaces(
	398	struct ieee80211_hw *hw,
	399	void (iterator)(void data, u8 *mac,
	400	struct ieee80211_vif *vif),
	401	void *data)
dabeb344 JB	402	{
	403	struct ieee80211_local *local = hw_to_local(hw);
	404	struct ieee80211_sub_if_data *sdata;
	405
2f561feb ID	406	rtnl_lock();
	407
	408	list_for_each_entry(sdata, &local->interfaces, list) {
	409	switch (sdata->vif.type) {
	410	case IEEE80211_IF_TYPE_INVALID:
	411	case IEEE80211_IF_TYPE_MNTR:
	412	case IEEE80211_IF_TYPE_VLAN:
	413	continue;
	414	case IEEE80211_IF_TYPE_AP:
	415	case IEEE80211_IF_TYPE_STA:
	416	case IEEE80211_IF_TYPE_IBSS:
	417	case IEEE80211_IF_TYPE_WDS:
	418	case IEEE80211_IF_TYPE_MESH_POINT:
	419	break;
	420	}
2f561feb ID	421	if (netif_running(sdata->dev))
	422	iterator(data, sdata->dev->dev_addr,
	423	&sdata->vif);
	424	}
	425
	426	rtnl_unlock();
	427	}
	428	EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
	429
	430	void ieee80211_iterate_active_interfaces_atomic(
	431	struct ieee80211_hw *hw,
	432	void (iterator)(void data, u8 *mac,
	433	struct ieee80211_vif *vif),
	434	void *data)
	435	{
	436	struct ieee80211_local *local = hw_to_local(hw);
	437	struct ieee80211_sub_if_data *sdata;
	438
e38bad47	439	rcu_read_lock();
dabeb344	440
e38bad47	441	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
51fb61e7	442	switch (sdata->vif.type) {
dabeb344 JB	443	case IEEE80211_IF_TYPE_INVALID:
	444	case IEEE80211_IF_TYPE_MNTR:
	445	case IEEE80211_IF_TYPE_VLAN:
	446	continue;
	447	case IEEE80211_IF_TYPE_AP:
	448	case IEEE80211_IF_TYPE_STA:
	449	case IEEE80211_IF_TYPE_IBSS:
	450	case IEEE80211_IF_TYPE_WDS:
6032f934	451	case IEEE80211_IF_TYPE_MESH_POINT:
dabeb344 JB	452	break;
dabeb344 JB	453	}
dabeb344 JB	454	if (netif_running(sdata->dev))
dabeb344 JB	455	iterator(data, sdata->dev->dev_addr,
32bfd35d	456	&sdata->vif);
dabeb344	457	}
e38bad47 JB	458
e38bad47 JB	459	rcu_read_unlock();
dabeb344	460	}
2f561feb	461	EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);