[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)
{
	u16 fc;

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

	fc = le16_to_cpu(hdr->frame_control);

	switch (fc & IEEE80211_FCTL_FTYPE) {
	case IEEE80211_FTYPE_DATA:
		if (len < 24) /* drop incorrect hdr len (data) */
			return NULL;
		switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
		case IEEE80211_FCTL_TODS:
			return hdr->addr1;
		case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
			return NULL;
		case IEEE80211_FCTL_FROMDS:
			return hdr->addr2;
		case 0:
			return hdr->addr3;
		}
		break;
	case IEEE80211_FTYPE_MGMT:
		if (len < 24) /* drop incorrect hdr len (mgmt) */
			return NULL;
		return hdr->addr3;
	case IEEE80211_FTYPE_CTL:
		if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)
			return hdr->addr1;
		else if ((fc & IEEE80211_FCTL_STYPE) ==
						IEEE80211_STYPE_BACK_REQ) {
			switch (type) {
			case IEEE80211_IF_TYPE_STA:
				return hdr->addr2;
			case IEEE80211_IF_TYPE_AP:
			case IEEE80211_IF_TYPE_VLAN:
				return hdr->addr1;
			default:
				return NULL;
			}
		}
		else
			return NULL;
	}

	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 {
		if (ieee80211_is_multiqueue(local)) {
			netif_wake_subqueue(local->mdev, queue);
		} else {
			WARN_ON(queue != 0);
			netif_wake_queue(local->mdev);
		}
	}
}
EXPORT_SYMBOL(ieee80211_wake_queue);

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

	if (ieee80211_is_multiqueue(local)) {
		netif_stop_subqueue(local->mdev, queue);
	} else {
		WARN_ON(queue != 0);
		netif_stop_queue(local->mdev);
	}
}
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 (sdata->dev == local->mdev)
			continue;
		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 (sdata->dev == local->mdev)
			continue;
		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 JB	47	{
	48	u16 fc;
	49
98f0b0a3 RR	50	/* drop ACK/CTS frames and incorrect hdr len (ctrl) */
98f0b0a3 RR	51	if (len < 16)
c2d1560a JB	52	return NULL;
	53
	54	fc = le16_to_cpu(hdr->frame_control);
	55
	56	switch (fc & IEEE80211_FCTL_FTYPE) {
	57	case IEEE80211_FTYPE_DATA:
98f0b0a3 RR	58	if (len < 24) /* drop incorrect hdr len (data) */
98f0b0a3 RR	59	return NULL;
c2d1560a JB	60	switch (fc & (IEEE80211_FCTL_TODS \| IEEE80211_FCTL_FROMDS)) {
	61	case IEEE80211_FCTL_TODS:
	62	return hdr->addr1;
	63	case (IEEE80211_FCTL_TODS \| IEEE80211_FCTL_FROMDS):
	64	return NULL;
	65	case IEEE80211_FCTL_FROMDS:
	66	return hdr->addr2;
	67	case 0:
	68	return hdr->addr3;
	69	}
	70	break;
	71	case IEEE80211_FTYPE_MGMT:
98f0b0a3 RR	72	if (len < 24) /* drop incorrect hdr len (mgmt) */
98f0b0a3 RR	73	return NULL;
c2d1560a JB	74	return hdr->addr3;
	75	case IEEE80211_FTYPE_CTL:
	76	if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)
	77	return hdr->addr1;
71364716 RR	78	else if ((fc & IEEE80211_FCTL_STYPE) ==
	79	IEEE80211_STYPE_BACK_REQ) {
	80	switch (type) {
	81	case IEEE80211_IF_TYPE_STA:
	82	return hdr->addr2;
	83	case IEEE80211_IF_TYPE_AP:
	84	case IEEE80211_IF_TYPE_VLAN:
	85	return hdr->addr1;
	86	default:
	87	return NULL;
	88	}
	89	}
c2d1560a JB	90	else
	91	return NULL;
	92	}
	93
	94	return NULL;
	95	}
	96
	97	int ieee80211_get_hdrlen(u16 fc)
	98	{
	99	int hdrlen = 24;
	100
	101	switch (fc & IEEE80211_FCTL_FTYPE) {
	102	case IEEE80211_FTYPE_DATA:
	103	if ((fc & IEEE80211_FCTL_FROMDS) && (fc & IEEE80211_FCTL_TODS))
	104	hdrlen = 30; /* Addr4 */
	105	/*
	106	* The QoS Control field is two bytes and its presence is
	107	* indicated by the IEEE80211_STYPE_QOS_DATA bit. Add 2 to
	108	* hdrlen if that bit is set.
	109	* This works by masking out the bit and shifting it to
	110	* bit position 1 so the result has the value 0 or 2.
	111	*/
	112	hdrlen += (fc & IEEE80211_STYPE_QOS_DATA)
	113	>> (ilog2(IEEE80211_STYPE_QOS_DATA)-1);
	114	break;
	115	case IEEE80211_FTYPE_CTL:
	116	/*
	117	* ACK and CTS are 10 bytes, all others 16. To see how
	118	* to get this condition consider
	119	* subtype mask: 0b0000000011110000 (0x00F0)
	120	* ACK subtype: 0b0000000011010000 (0x00D0)
	121	* CTS subtype: 0b0000000011000000 (0x00C0)
	122	* bits that matter: ^^^ (0x00E0)
	123	* value of those: 0b0000000011000000 (0x00C0)
	124	*/
	125	if ((fc & 0xE0) == 0xC0)
	126	hdrlen = 10;
	127	else
	128	hdrlen = 16;
	129	break;
	130	}
	131
	132	return hdrlen;
	133	}
	134	EXPORT_SYMBOL(ieee80211_get_hdrlen);
	135
6693be71 HH	136	unsigned int ieee80211_hdrlen(__le16 fc)
	137	{
	138	unsigned int hdrlen = 24;
	139
	140	if (ieee80211_is_data(fc)) {
	141	if (ieee80211_has_a4(fc))
	142	hdrlen = 30;
	143	if (ieee80211_is_data_qos(fc))
	144	hdrlen += IEEE80211_QOS_CTL_LEN;
	145	goto out;
	146	}
	147
	148	if (ieee80211_is_ctl(fc)) {
	149	/*
	150	* ACK and CTS are 10 bytes, all others 16. To see how
	151	* to get this condition consider
	152	* subtype mask: 0b0000000011110000 (0x00F0)
	153	* ACK subtype: 0b0000000011010000 (0x00D0)
	154	* CTS subtype: 0b0000000011000000 (0x00C0)
	155	* bits that matter: ^^^ (0x00E0)
	156	* value of those: 0b0000000011000000 (0x00C0)
	157	*/
	158	if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
	159	hdrlen = 10;
	160	else
	161	hdrlen = 16;
	162	}
	163	out:
	164	return hdrlen;
	165	}
	166	EXPORT_SYMBOL(ieee80211_hdrlen);
	167
c9c6950c	168	unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
c2d1560a	169	{
c9c6950c HH	170	const struct ieee80211_hdr hdr = (const struct ieee80211_hdr )skb->data;
c9c6950c HH	171	unsigned int hdrlen;
c2d1560a JB	172
	173	if (unlikely(skb->len < 10))
	174	return 0;
c9c6950c	175	hdrlen = ieee80211_hdrlen(hdr->frame_control);
c2d1560a JB	176	if (unlikely(hdrlen > skb->len))
	177	return 0;
	178	return hdrlen;
	179	}
	180	EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
	181
ee385855 LCC	182	int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
	183	{
	184	int ae = meshhdr->flags & IEEE80211S_FLAGS_AE;
	185	/* 7.1.3.5a.2 */
	186	switch (ae) {
	187	case 0:
ef269254	188	return 6;
ee385855	189	case 1:
ef269254	190	return 12;
ee385855	191	case 2:
ef269254	192	return 18;
ee385855	193	case 3:
ef269254	194	return 24;
ee385855	195	default:
ef269254	196	return 6;
ee385855 LCC	197	}
ee385855 LCC	198	}
ee385855	199
5cf121c3	200	void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
c2d1560a JB	201	{
	202	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) tx->skb->data;
	203
	204	hdr->frame_control \|= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
5cf121c3	205	if (tx->extra_frag) {
c2d1560a JB	206	struct ieee80211_hdr *fhdr;
c2d1560a JB	207	int i;
5cf121c3	208	for (i = 0; i < tx->num_extra_frag; i++) {
c2d1560a	209	fhdr = (struct ieee80211_hdr *)
5cf121c3	210	tx->extra_frag[i]->data;
c2d1560a JB	211	fhdr->frame_control \|= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	212	}
	213	}
	214	}
	215
	216	int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
	217	int rate, int erp, int short_preamble)
	218	{
	219	int dur;
	220
	221	/* calculate duration (in microseconds, rounded up to next higher
	222	* integer if it includes a fractional microsecond) to send frame of
	223	* len bytes (does not include FCS) at the given rate. Duration will
	224	* also include SIFS.
	225	*
	226	* rate is in 100 kbps, so divident is multiplied by 10 in the
	227	* DIV_ROUND_UP() operations.
	228	*/
	229
8318d78a	230	if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ \|\| erp) {
c2d1560a JB	231	/*
	232	* OFDM:
	233	*
	234	* N_DBPS = DATARATE x 4
	235	* N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
	236	* (16 = SIGNAL time, 6 = tail bits)
	237	* TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
	238	*
	239	* T_SYM = 4 usec
	240	* 802.11a - 17.5.2: aSIFSTime = 16 usec
	241	* 802.11g - 19.8.4: aSIFSTime = 10 usec +
	242	* signal ext = 6 usec
	243	*/
c2d1560a JB	244	dur = 16; /* SIFS + signal ext */
	245	dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
	246	dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
	247	dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
	248	4 * rate); /* T_SYM x N_SYM */
	249	} else {
	250	/*
	251	* 802.11b or 802.11g with 802.11b compatibility:
	252	* 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
	253	* Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
	254	*
	255	* 802.11 (DS): 15.3.3, 802.11b: 18.3.4
	256	* aSIFSTime = 10 usec
	257	* aPreambleLength = 144 usec or 72 usec with short preamble
	258	* aPLCPHeaderLength = 48 usec or 24 usec with short preamble
	259	*/
	260	dur = 10; /* aSIFSTime = 10 usec */
	261	dur += short_preamble ? (72 + 24) : (144 + 48);
	262
	263	dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
	264	}
	265
	266	return dur;
	267	}
	268
	269	/* Exported duration function for driver use */
32bfd35d JB	270	__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
32bfd35d JB	271	struct ieee80211_vif *vif,
8318d78a JB	272	size_t frame_len,
8318d78a JB	273	struct ieee80211_rate *rate)
c2d1560a JB	274	{
c2d1560a JB	275	struct ieee80211_local *local = hw_to_local(hw);
32bfd35d	276	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
c2d1560a JB	277	u16 dur;
	278	int erp;
	279
8318d78a JB	280	erp = 0;
	281	if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
	282	erp = rate->flags & IEEE80211_RATE_ERP_G;
	283
	284	dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
471b3efd	285	sdata->bss_conf.use_short_preamble);
c2d1560a JB	286
	287	return cpu_to_le16(dur);
	288	}
	289	EXPORT_SYMBOL(ieee80211_generic_frame_duration);
	290
32bfd35d JB	291	__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
32bfd35d JB	292	struct ieee80211_vif *vif, size_t frame_len,
e039fa4a	293	const struct ieee80211_tx_info *frame_txctl)
c2d1560a JB	294	{
	295	struct ieee80211_local *local = hw_to_local(hw);
	296	struct ieee80211_rate *rate;
32bfd35d	297	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
471b3efd	298	bool short_preamble;
c2d1560a JB	299	int erp;
c2d1560a JB	300	u16 dur;
2e92e6f2 JB	301	struct ieee80211_supported_band *sband;
	302
	303	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
c2d1560a	304
471b3efd	305	short_preamble = sdata->bss_conf.use_short_preamble;
7e9ed188	306
e039fa4a	307	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
8318d78a JB	308
	309	erp = 0;
	310	if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
	311	erp = rate->flags & IEEE80211_RATE_ERP_G;
c2d1560a JB	312
c2d1560a JB	313	/* CTS duration */
8318d78a	314	dur = ieee80211_frame_duration(local, 10, rate->bitrate,
c2d1560a JB	315	erp, short_preamble);
c2d1560a JB	316	/* Data frame duration */
8318d78a	317	dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
c2d1560a JB	318	erp, short_preamble);
c2d1560a JB	319	/* ACK duration */
8318d78a	320	dur += ieee80211_frame_duration(local, 10, rate->bitrate,
c2d1560a JB	321	erp, short_preamble);
	322
	323	return cpu_to_le16(dur);
	324	}
	325	EXPORT_SYMBOL(ieee80211_rts_duration);
	326
32bfd35d JB	327	__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
32bfd35d JB	328	struct ieee80211_vif *vif,
c2d1560a	329	size_t frame_len,
e039fa4a	330	const struct ieee80211_tx_info *frame_txctl)
c2d1560a JB	331	{
	332	struct ieee80211_local *local = hw_to_local(hw);
	333	struct ieee80211_rate *rate;
32bfd35d	334	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
471b3efd	335	bool short_preamble;
c2d1560a JB	336	int erp;
c2d1560a JB	337	u16 dur;
2e92e6f2 JB	338	struct ieee80211_supported_band *sband;
	339
	340	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
c2d1560a	341
471b3efd	342	short_preamble = sdata->bss_conf.use_short_preamble;
7e9ed188	343
e039fa4a	344	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
8318d78a JB	345	erp = 0;
	346	if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
	347	erp = rate->flags & IEEE80211_RATE_ERP_G;
c2d1560a JB	348
c2d1560a JB	349	/* Data frame duration */
8318d78a	350	dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
c2d1560a	351	erp, short_preamble);
e039fa4a	352	if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
c2d1560a	353	/* ACK duration */
8318d78a	354	dur += ieee80211_frame_duration(local, 10, rate->bitrate,
c2d1560a JB	355	erp, short_preamble);
	356	}
	357
	358	return cpu_to_le16(dur);
	359	}
	360	EXPORT_SYMBOL(ieee80211_ctstoself_duration);
	361
c2d1560a JB	362	void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
	363	{
	364	struct ieee80211_local *local = hw_to_local(hw);
	365
e2530083 JB	366	if (test_bit(queue, local->queues_pending)) {
	367	tasklet_schedule(&local->tx_pending_tasklet);
	368	} else {
	369	if (ieee80211_is_multiqueue(local)) {
	370	netif_wake_subqueue(local->mdev, queue);
	371	} else {
	372	WARN_ON(queue != 0);
	373	netif_wake_queue(local->mdev);
	374	}
c2d1560a JB	375	}
	376	}
	377	EXPORT_SYMBOL(ieee80211_wake_queue);
	378
	379	void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
	380	{
	381	struct ieee80211_local *local = hw_to_local(hw);
	382
e2530083 JB	383	if (ieee80211_is_multiqueue(local)) {
	384	netif_stop_subqueue(local->mdev, queue);
	385	} else {
	386	WARN_ON(queue != 0);
c2d1560a	387	netif_stop_queue(local->mdev);
e2530083	388	}
c2d1560a JB	389	}
	390	EXPORT_SYMBOL(ieee80211_stop_queue);
	391
c2d1560a JB	392	void ieee80211_stop_queues(struct ieee80211_hw *hw)
	393	{
	394	int i;
	395
e2530083	396	for (i = 0; i < ieee80211_num_queues(hw); i++)
c2d1560a JB	397	ieee80211_stop_queue(hw, i);
	398	}
	399	EXPORT_SYMBOL(ieee80211_stop_queues);
	400
	401	void ieee80211_wake_queues(struct ieee80211_hw *hw)
	402	{
	403	int i;
	404
c4680470	405	for (i = 0; i < hw->queues + hw->ampdu_queues; i++)
c2d1560a JB	406	ieee80211_wake_queue(hw, i);
	407	}
	408	EXPORT_SYMBOL(ieee80211_wake_queues);
dabeb344	409
32bfd35d JB	410	void ieee80211_iterate_active_interfaces(
	411	struct ieee80211_hw *hw,
	412	void (iterator)(void data, u8 *mac,
	413	struct ieee80211_vif *vif),
	414	void *data)
dabeb344 JB	415	{
	416	struct ieee80211_local *local = hw_to_local(hw);
	417	struct ieee80211_sub_if_data *sdata;
	418
2f561feb ID	419	rtnl_lock();
	420
	421	list_for_each_entry(sdata, &local->interfaces, list) {
	422	switch (sdata->vif.type) {
	423	case IEEE80211_IF_TYPE_INVALID:
	424	case IEEE80211_IF_TYPE_MNTR:
	425	case IEEE80211_IF_TYPE_VLAN:
	426	continue;
	427	case IEEE80211_IF_TYPE_AP:
	428	case IEEE80211_IF_TYPE_STA:
	429	case IEEE80211_IF_TYPE_IBSS:
	430	case IEEE80211_IF_TYPE_WDS:
	431	case IEEE80211_IF_TYPE_MESH_POINT:
	432	break;
	433	}
	434	if (sdata->dev == local->mdev)
	435	continue;
	436	if (netif_running(sdata->dev))
	437	iterator(data, sdata->dev->dev_addr,
	438	&sdata->vif);
	439	}
	440
	441	rtnl_unlock();
	442	}
	443	EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
	444
	445	void ieee80211_iterate_active_interfaces_atomic(
	446	struct ieee80211_hw *hw,
	447	void (iterator)(void data, u8 *mac,
	448	struct ieee80211_vif *vif),
	449	void *data)
	450	{
	451	struct ieee80211_local *local = hw_to_local(hw);
	452	struct ieee80211_sub_if_data *sdata;
	453
e38bad47	454	rcu_read_lock();
dabeb344	455
e38bad47	456	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
51fb61e7	457	switch (sdata->vif.type) {
dabeb344 JB	458	case IEEE80211_IF_TYPE_INVALID:
	459	case IEEE80211_IF_TYPE_MNTR:
	460	case IEEE80211_IF_TYPE_VLAN:
	461	continue;
	462	case IEEE80211_IF_TYPE_AP:
	463	case IEEE80211_IF_TYPE_STA:
	464	case IEEE80211_IF_TYPE_IBSS:
	465	case IEEE80211_IF_TYPE_WDS:
6032f934	466	case IEEE80211_IF_TYPE_MESH_POINT:
dabeb344 JB	467	break;
	468	}
	469	if (sdata->dev == local->mdev)
	470	continue;
	471	if (netif_running(sdata->dev))
	472	iterator(data, sdata->dev->dev_addr,
32bfd35d	473	&sdata->vif);
dabeb344	474	}
e38bad47 JB	475
e38bad47 JB	476	rcu_read_unlock();
dabeb344	477	}
2f561feb	478	EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);