[mirror_ubuntu-zesty-kernel.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[] =
	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };

/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
const unsigned char bridge_tunnel_header[] =
	{ 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);

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

	if (unlikely(skb->len < 10))
		return 0;
	hdrlen = ieee80211_get_hdrlen(le16_to_cpu(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_control *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;

	short_preamble = sdata->bss_conf.use_short_preamble;

	rate = frame_txctl->rts_cts_rate;

	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_control *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;

	short_preamble = sdata->bss_conf.use_short_preamble;

	rate = frame_txctl->rts_cts_rate;
	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_TXCTL_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_and_clear_bit(IEEE80211_LINK_STATE_XOFF,
			       &local->state[queue])) {
		if (test_bit(IEEE80211_LINK_STATE_PENDING,
			     &local->state[queue]))
			tasklet_schedule(&local->tx_pending_tasklet);
		else
			if (!ieee80211_qdisc_installed(local->mdev)) {
				if (queue == 0)
					netif_wake_queue(local->mdev);
			} else
				__netif_schedule(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_qdisc_installed(local->mdev) && queue == 0)
		netif_stop_queue(local->mdev);
	set_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
}
EXPORT_SYMBOL(ieee80211_stop_queue);

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

	for (i = 0; i < hw->queues + hw->ampdu_queues; 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;

	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);
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) */
	37	const unsigned char rfc1042_header[] =
	38	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
	39
	40	/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
	41	const unsigned char bridge_tunnel_header[] =
	42	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
	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
	136	int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
	137	{
	138	const struct ieee80211_hdr hdr = (const struct ieee80211_hdr ) skb->data;
	139	int hdrlen;
	140
	141	if (unlikely(skb->len < 10))
	142	return 0;
	143	hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
	144	if (unlikely(hdrlen > skb->len))
	145	return 0;
	146	return hdrlen;
	147	}
	148	EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
	149
ee385855 LCC	150	int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
	151	{
	152	int ae = meshhdr->flags & IEEE80211S_FLAGS_AE;
	153	/* 7.1.3.5a.2 */
	154	switch (ae) {
	155	case 0:
ef269254	156	return 6;
ee385855	157	case 1:
ef269254	158	return 12;
ee385855	159	case 2:
ef269254	160	return 18;
ee385855	161	case 3:
ef269254	162	return 24;
ee385855	163	default:
ef269254	164	return 6;
ee385855 LCC	165	}
ee385855 LCC	166	}
ee385855	167
5cf121c3	168	void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
c2d1560a JB	169	{
	170	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) tx->skb->data;
	171
	172	hdr->frame_control \|= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
5cf121c3	173	if (tx->extra_frag) {
c2d1560a JB	174	struct ieee80211_hdr *fhdr;
c2d1560a JB	175	int i;
5cf121c3	176	for (i = 0; i < tx->num_extra_frag; i++) {
c2d1560a	177	fhdr = (struct ieee80211_hdr *)
5cf121c3	178	tx->extra_frag[i]->data;
c2d1560a JB	179	fhdr->frame_control \|= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	180	}
	181	}
	182	}
	183
	184	int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
	185	int rate, int erp, int short_preamble)
	186	{
	187	int dur;
	188
	189	/* calculate duration (in microseconds, rounded up to next higher
	190	* integer if it includes a fractional microsecond) to send frame of
	191	* len bytes (does not include FCS) at the given rate. Duration will
	192	* also include SIFS.
	193	*
	194	* rate is in 100 kbps, so divident is multiplied by 10 in the
	195	* DIV_ROUND_UP() operations.
	196	*/
	197
8318d78a	198	if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ \|\| erp) {
c2d1560a JB	199	/*
	200	* OFDM:
	201	*
	202	* N_DBPS = DATARATE x 4
	203	* N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
	204	* (16 = SIGNAL time, 6 = tail bits)
	205	* TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
	206	*
	207	* T_SYM = 4 usec
	208	* 802.11a - 17.5.2: aSIFSTime = 16 usec
	209	* 802.11g - 19.8.4: aSIFSTime = 10 usec +
	210	* signal ext = 6 usec
	211	*/
c2d1560a JB	212	dur = 16; /* SIFS + signal ext */
	213	dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
	214	dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
	215	dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
	216	4 * rate); /* T_SYM x N_SYM */
	217	} else {
	218	/*
	219	* 802.11b or 802.11g with 802.11b compatibility:
	220	* 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
	221	* Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
	222	*
	223	* 802.11 (DS): 15.3.3, 802.11b: 18.3.4
	224	* aSIFSTime = 10 usec
	225	* aPreambleLength = 144 usec or 72 usec with short preamble
	226	* aPLCPHeaderLength = 48 usec or 24 usec with short preamble
	227	*/
	228	dur = 10; /* aSIFSTime = 10 usec */
	229	dur += short_preamble ? (72 + 24) : (144 + 48);
	230
	231	dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
	232	}
	233
	234	return dur;
	235	}
	236
	237	/* Exported duration function for driver use */
32bfd35d JB	238	__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
32bfd35d JB	239	struct ieee80211_vif *vif,
8318d78a JB	240	size_t frame_len,
8318d78a JB	241	struct ieee80211_rate *rate)
c2d1560a JB	242	{
c2d1560a JB	243	struct ieee80211_local *local = hw_to_local(hw);
32bfd35d	244	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
c2d1560a JB	245	u16 dur;
	246	int erp;
	247
8318d78a JB	248	erp = 0;
	249	if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
	250	erp = rate->flags & IEEE80211_RATE_ERP_G;
	251
	252	dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
471b3efd	253	sdata->bss_conf.use_short_preamble);
c2d1560a JB	254
	255	return cpu_to_le16(dur);
	256	}
	257	EXPORT_SYMBOL(ieee80211_generic_frame_duration);
	258
32bfd35d JB	259	__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
32bfd35d JB	260	struct ieee80211_vif *vif, size_t frame_len,
c2d1560a JB	261	const struct ieee80211_tx_control *frame_txctl)
	262	{
	263	struct ieee80211_local *local = hw_to_local(hw);
	264	struct ieee80211_rate *rate;
32bfd35d	265	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
471b3efd	266	bool short_preamble;
c2d1560a JB	267	int erp;
	268	u16 dur;
	269
471b3efd	270	short_preamble = sdata->bss_conf.use_short_preamble;
7e9ed188	271
8318d78a JB	272	rate = frame_txctl->rts_cts_rate;
	273
	274	erp = 0;
	275	if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
	276	erp = rate->flags & IEEE80211_RATE_ERP_G;
c2d1560a JB	277
c2d1560a JB	278	/* CTS duration */
8318d78a	279	dur = ieee80211_frame_duration(local, 10, rate->bitrate,
c2d1560a JB	280	erp, short_preamble);
c2d1560a JB	281	/* Data frame duration */
8318d78a	282	dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
c2d1560a JB	283	erp, short_preamble);
c2d1560a JB	284	/* ACK duration */
8318d78a	285	dur += ieee80211_frame_duration(local, 10, rate->bitrate,
c2d1560a JB	286	erp, short_preamble);
	287
	288	return cpu_to_le16(dur);
	289	}
	290	EXPORT_SYMBOL(ieee80211_rts_duration);
	291
32bfd35d JB	292	__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
32bfd35d JB	293	struct ieee80211_vif *vif,
c2d1560a JB	294	size_t frame_len,
	295	const struct ieee80211_tx_control *frame_txctl)
	296	{
	297	struct ieee80211_local *local = hw_to_local(hw);
	298	struct ieee80211_rate *rate;
32bfd35d	299	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
471b3efd	300	bool short_preamble;
c2d1560a JB	301	int erp;
	302	u16 dur;
	303
471b3efd	304	short_preamble = sdata->bss_conf.use_short_preamble;
7e9ed188	305
8318d78a JB	306	rate = frame_txctl->rts_cts_rate;
	307	erp = 0;
	308	if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
	309	erp = rate->flags & IEEE80211_RATE_ERP_G;
c2d1560a JB	310
c2d1560a JB	311	/* Data frame duration */
8318d78a	312	dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
c2d1560a JB	313	erp, short_preamble);
	314	if (!(frame_txctl->flags & IEEE80211_TXCTL_NO_ACK)) {
	315	/* ACK duration */
8318d78a	316	dur += ieee80211_frame_duration(local, 10, rate->bitrate,
c2d1560a JB	317	erp, short_preamble);
	318	}
	319
	320	return cpu_to_le16(dur);
	321	}
	322	EXPORT_SYMBOL(ieee80211_ctstoself_duration);
	323
c2d1560a JB	324	void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
	325	{
	326	struct ieee80211_local *local = hw_to_local(hw);
	327
	328	if (test_and_clear_bit(IEEE80211_LINK_STATE_XOFF,
	329	&local->state[queue])) {
	330	if (test_bit(IEEE80211_LINK_STATE_PENDING,
	331	&local->state[queue]))
	332	tasklet_schedule(&local->tx_pending_tasklet);
	333	else
	334	if (!ieee80211_qdisc_installed(local->mdev)) {
	335	if (queue == 0)
	336	netif_wake_queue(local->mdev);
	337	} else
	338	__netif_schedule(local->mdev);
	339	}
	340	}
	341	EXPORT_SYMBOL(ieee80211_wake_queue);
	342
	343	void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
	344	{
	345	struct ieee80211_local *local = hw_to_local(hw);
	346
	347	if (!ieee80211_qdisc_installed(local->mdev) && queue == 0)
	348	netif_stop_queue(local->mdev);
	349	set_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
	350	}
	351	EXPORT_SYMBOL(ieee80211_stop_queue);
	352
c2d1560a JB	353	void ieee80211_stop_queues(struct ieee80211_hw *hw)
	354	{
	355	int i;
	356
c4680470	357	for (i = 0; i < hw->queues + hw->ampdu_queues; i++)
c2d1560a JB	358	ieee80211_stop_queue(hw, i);
	359	}
	360	EXPORT_SYMBOL(ieee80211_stop_queues);
	361
	362	void ieee80211_wake_queues(struct ieee80211_hw *hw)
	363	{
	364	int i;
	365
c4680470	366	for (i = 0; i < hw->queues + hw->ampdu_queues; i++)
c2d1560a JB	367	ieee80211_wake_queue(hw, i);
	368	}
	369	EXPORT_SYMBOL(ieee80211_wake_queues);
dabeb344	370
32bfd35d JB	371	void ieee80211_iterate_active_interfaces(
	372	struct ieee80211_hw *hw,
	373	void (iterator)(void data, u8 *mac,
	374	struct ieee80211_vif *vif),
	375	void *data)
dabeb344 JB	376	{
	377	struct ieee80211_local *local = hw_to_local(hw);
	378	struct ieee80211_sub_if_data *sdata;
	379
e38bad47	380	rcu_read_lock();
dabeb344	381
e38bad47	382	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
51fb61e7	383	switch (sdata->vif.type) {
dabeb344 JB	384	case IEEE80211_IF_TYPE_INVALID:
	385	case IEEE80211_IF_TYPE_MNTR:
	386	case IEEE80211_IF_TYPE_VLAN:
	387	continue;
	388	case IEEE80211_IF_TYPE_AP:
	389	case IEEE80211_IF_TYPE_STA:
	390	case IEEE80211_IF_TYPE_IBSS:
	391	case IEEE80211_IF_TYPE_WDS:
6032f934	392	case IEEE80211_IF_TYPE_MESH_POINT:
dabeb344 JB	393	break;
	394	}
	395	if (sdata->dev == local->mdev)
	396	continue;
	397	if (netif_running(sdata->dev))
	398	iterator(data, sdata->dev->dev_addr,
32bfd35d	399	&sdata->vif);
dabeb344	400	}
e38bad47 JB	401
e38bad47 JB	402	rcu_read_unlock();
dabeb344 JB	403	}
dabeb344 JB	404	EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);