[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 "ieee80211_rate.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 };


static int rate_list_match(const int *rate_list, int rate)
{
	int i;

	if (!rate_list)
		return 0;

	for (i = 0; rate_list[i] >= 0; i++)
		if (rate_list[i] == rate)
			return 1;

	return 0;
}

void ieee80211_prepare_rates(struct ieee80211_local *local,
			     struct ieee80211_hw_mode *mode)
{
	int i;

	for (i = 0; i < mode->num_rates; i++) {
		struct ieee80211_rate *rate = &mode->rates[i];

		rate->flags &= ~(IEEE80211_RATE_SUPPORTED |
				 IEEE80211_RATE_BASIC);

		if (local->supp_rates[mode->mode]) {
			if (!rate_list_match(local->supp_rates[mode->mode],
					     rate->rate))
				continue;
		}

		rate->flags |= IEEE80211_RATE_SUPPORTED;

		/* Use configured basic rate set if it is available. If not,
		 * use defaults that are sane for most cases. */
		if (local->basic_rates[mode->mode]) {
			if (rate_list_match(local->basic_rates[mode->mode],
					    rate->rate))
				rate->flags |= IEEE80211_RATE_BASIC;
		} else switch (mode->mode) {
		case MODE_IEEE80211A:
			if (rate->rate == 60 || rate->rate == 120 ||
			    rate->rate == 240)
				rate->flags |= IEEE80211_RATE_BASIC;
			break;
		case MODE_IEEE80211B:
			if (rate->rate == 10 || rate->rate == 20)
				rate->flags |= IEEE80211_RATE_BASIC;
			break;
		case MODE_IEEE80211G:
			if (rate->rate == 10 || rate->rate == 20 ||
			    rate->rate == 55 || rate->rate == 110)
				rate->flags |= IEEE80211_RATE_BASIC;
			break;
		case NUM_IEEE80211_MODES:
			/* not useful */
			break;
		}

		/* Set ERP and MANDATORY flags based on phymode */
		switch (mode->mode) {
		case MODE_IEEE80211A:
			if (rate->rate == 60 || rate->rate == 120 ||
			    rate->rate == 240)
				rate->flags |= IEEE80211_RATE_MANDATORY;
			break;
		case MODE_IEEE80211B:
			if (rate->rate == 10)
				rate->flags |= IEEE80211_RATE_MANDATORY;
			break;
		case MODE_IEEE80211G:
			if (rate->rate == 10 || rate->rate == 20 ||
			    rate->rate == 55 || rate->rate == 110 ||
			    rate->rate == 60 || rate->rate == 120 ||
			    rate->rate == 240)
				rate->flags |= IEEE80211_RATE_MANDATORY;
			break;
		case NUM_IEEE80211_MODES:
			/* not useful */
			break;
		}
		if (ieee80211_is_erp_rate(mode->mode, rate->rate))
			rate->flags |= IEEE80211_RATE_ERP;
	}
}

u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len)
{
	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
			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);

void ieee80211_tx_set_iswep(struct ieee80211_txrx_data *tx)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;

	hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	if (tx->u.tx.extra_frag) {
		struct ieee80211_hdr *fhdr;
		int i;
		for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
			fhdr = (struct ieee80211_hdr *)
				tx->u.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.phymode == MODE_IEEE80211A || 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, int if_id,
					size_t frame_len, int rate)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct net_device *bdev = dev_get_by_index(&init_net, if_id);
	struct ieee80211_sub_if_data *sdata;
	u16 dur;
	int erp;

	if (unlikely(!bdev))
		return 0;

	sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
	erp = ieee80211_is_erp_rate(hw->conf.phymode, rate);
	dur = ieee80211_frame_duration(local, frame_len, rate,
		       erp, sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE);

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

__le16 ieee80211_rts_duration(struct ieee80211_hw *hw, int if_id,
			      size_t frame_len,
			      const struct ieee80211_tx_control *frame_txctl)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_rate *rate;
	struct net_device *bdev = dev_get_by_index(&init_net, if_id);
	struct ieee80211_sub_if_data *sdata;
	int short_preamble;
	int erp;
	u16 dur;

	if (unlikely(!bdev))
		return 0;

	sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
	short_preamble = sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE;

	rate = frame_txctl->rts_rate;
	erp = !!(rate->flags & IEEE80211_RATE_ERP);

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

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

__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw, int if_id,
				    size_t frame_len,
				    const struct ieee80211_tx_control *frame_txctl)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_rate *rate;
	struct net_device *bdev = dev_get_by_index(&init_net, if_id);
	struct ieee80211_sub_if_data *sdata;
	int short_preamble;
	int erp;
	u16 dur;

	if (unlikely(!bdev))
		return 0;

	sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
	short_preamble = sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE;

	rate = frame_txctl->rts_rate;
	erp = !!(rate->flags & IEEE80211_RATE_ERP);

	/* Data frame duration */
	dur = ieee80211_frame_duration(local, frame_len, rate->rate,
				       erp, short_preamble);
	if (!(frame_txctl->flags & IEEE80211_TXCTL_NO_ACK)) {
		/* ACK duration */
		dur += ieee80211_frame_duration(local, 10, rate->rate,
						erp, short_preamble);
	}

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

struct ieee80211_rate *
ieee80211_get_rate(struct ieee80211_local *local, int phymode, int hw_rate)
{
	struct ieee80211_hw_mode *mode;
	int r;

	list_for_each_entry(mode, &local->modes_list, list) {
		if (mode->mode != phymode)
			continue;
		for (r = 0; r < mode->num_rates; r++) {
			struct ieee80211_rate *rate = &mode->rates[r];
			if (rate->val == hw_rate ||
			    (rate->flags & IEEE80211_RATE_PREAMBLE2 &&
			     rate->val2 == hw_rate))
				return rate;
		}
	}

	return NULL;
}

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_start_queues(struct ieee80211_hw *hw)
{
	struct ieee80211_local *local = hw_to_local(hw);
	int i;

	for (i = 0; i < local->hw.queues; i++)
		clear_bit(IEEE80211_LINK_STATE_XOFF, &local->state[i]);
	if (!ieee80211_qdisc_installed(local->mdev))
		netif_start_queue(local->mdev);
}
EXPORT_SYMBOL(ieee80211_start_queues);

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

	for (i = 0; i < hw->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; 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,
							  int if_id),
					 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->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:
			break;
		}
		if (sdata->dev == local->mdev)
			continue;
		if (netif_running(sdata->dev))
			iterator(data, sdata->dev->dev_addr,
				 sdata->dev->ifindex);
	}

	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
	27	#include "ieee80211_i.h"
	28	#include "ieee80211_rate.h"
	29	#include "wme.h"
	30
	31	/* privid for wiphys to determine whether they belong to us or not */
	32	void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
	33
	34	/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
	35	/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
	36	const unsigned char rfc1042_header[] =
	37	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
	38
	39	/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
	40	const unsigned char bridge_tunnel_header[] =
	41	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
	42
c2d1560a JB	43
	44	static int rate_list_match(const int *rate_list, int rate)
	45	{
	46	int i;
	47
	48	if (!rate_list)
	49	return 0;
	50
	51	for (i = 0; rate_list[i] >= 0; i++)
	52	if (rate_list[i] == rate)
	53	return 1;
	54
	55	return 0;
	56	}
	57
	58	void ieee80211_prepare_rates(struct ieee80211_local *local,
	59	struct ieee80211_hw_mode *mode)
	60	{
	61	int i;
	62
	63	for (i = 0; i < mode->num_rates; i++) {
	64	struct ieee80211_rate *rate = &mode->rates[i];
	65
	66	rate->flags &= ~(IEEE80211_RATE_SUPPORTED \|
	67	IEEE80211_RATE_BASIC);
	68
	69	if (local->supp_rates[mode->mode]) {
	70	if (!rate_list_match(local->supp_rates[mode->mode],
	71	rate->rate))
	72	continue;
	73	}
	74
	75	rate->flags \|= IEEE80211_RATE_SUPPORTED;
	76
	77	/* Use configured basic rate set if it is available. If not,
	78	* use defaults that are sane for most cases. */
	79	if (local->basic_rates[mode->mode]) {
	80	if (rate_list_match(local->basic_rates[mode->mode],
	81	rate->rate))
	82	rate->flags \|= IEEE80211_RATE_BASIC;
	83	} else switch (mode->mode) {
	84	case MODE_IEEE80211A:
	85	if (rate->rate == 60 \|\| rate->rate == 120 \|\|
	86	rate->rate == 240)
	87	rate->flags \|= IEEE80211_RATE_BASIC;
	88	break;
	89	case MODE_IEEE80211B:
	90	if (rate->rate == 10 \|\| rate->rate == 20)
	91	rate->flags \|= IEEE80211_RATE_BASIC;
	92	break;
c2d1560a JB	93	case MODE_IEEE80211G:
	94	if (rate->rate == 10 \|\| rate->rate == 20 \|\|
	95	rate->rate == 55 \|\| rate->rate == 110)
	96	rate->flags \|= IEEE80211_RATE_BASIC;
	97	break;
693d454d JB	98	case NUM_IEEE80211_MODES:
	99	/* not useful */
	100	break;
c2d1560a JB	101	}
	102
	103	/* Set ERP and MANDATORY flags based on phymode */
	104	switch (mode->mode) {
	105	case MODE_IEEE80211A:
	106	if (rate->rate == 60 \|\| rate->rate == 120 \|\|
	107	rate->rate == 240)
	108	rate->flags \|= IEEE80211_RATE_MANDATORY;
	109	break;
	110	case MODE_IEEE80211B:
	111	if (rate->rate == 10)
	112	rate->flags \|= IEEE80211_RATE_MANDATORY;
	113	break;
c2d1560a JB	114	case MODE_IEEE80211G:
	115	if (rate->rate == 10 \|\| rate->rate == 20 \|\|
	116	rate->rate == 55 \|\| rate->rate == 110 \|\|
	117	rate->rate == 60 \|\| rate->rate == 120 \|\|
	118	rate->rate == 240)
	119	rate->flags \|= IEEE80211_RATE_MANDATORY;
	120	break;
693d454d JB	121	case NUM_IEEE80211_MODES:
	122	/* not useful */
	123	break;
c2d1560a JB	124	}
	125	if (ieee80211_is_erp_rate(mode->mode, rate->rate))
	126	rate->flags \|= IEEE80211_RATE_ERP;
	127	}
	128	}
	129
	130	u8 ieee80211_get_bssid(struct ieee80211_hdr hdr, size_t len)
	131	{
	132	u16 fc;
	133
98f0b0a3 RR	134	/* drop ACK/CTS frames and incorrect hdr len (ctrl) */
98f0b0a3 RR	135	if (len < 16)
c2d1560a JB	136	return NULL;
	137
	138	fc = le16_to_cpu(hdr->frame_control);
	139
	140	switch (fc & IEEE80211_FCTL_FTYPE) {
	141	case IEEE80211_FTYPE_DATA:
98f0b0a3 RR	142	if (len < 24) /* drop incorrect hdr len (data) */
98f0b0a3 RR	143	return NULL;
c2d1560a JB	144	switch (fc & (IEEE80211_FCTL_TODS \| IEEE80211_FCTL_FROMDS)) {
	145	case IEEE80211_FCTL_TODS:
	146	return hdr->addr1;
	147	case (IEEE80211_FCTL_TODS \| IEEE80211_FCTL_FROMDS):
	148	return NULL;
	149	case IEEE80211_FCTL_FROMDS:
	150	return hdr->addr2;
	151	case 0:
	152	return hdr->addr3;
	153	}
	154	break;
	155	case IEEE80211_FTYPE_MGMT:
98f0b0a3 RR	156	if (len < 24) /* drop incorrect hdr len (mgmt) */
98f0b0a3 RR	157	return NULL;
c2d1560a JB	158	return hdr->addr3;
	159	case IEEE80211_FTYPE_CTL:
	160	if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)
	161	return hdr->addr1;
	162	else
	163	return NULL;
	164	}
	165
	166	return NULL;
	167	}
	168
	169	int ieee80211_get_hdrlen(u16 fc)
	170	{
	171	int hdrlen = 24;
	172
	173	switch (fc & IEEE80211_FCTL_FTYPE) {
	174	case IEEE80211_FTYPE_DATA:
	175	if ((fc & IEEE80211_FCTL_FROMDS) && (fc & IEEE80211_FCTL_TODS))
	176	hdrlen = 30; /* Addr4 */
	177	/*
	178	* The QoS Control field is two bytes and its presence is
	179	* indicated by the IEEE80211_STYPE_QOS_DATA bit. Add 2 to
	180	* hdrlen if that bit is set.
	181	* This works by masking out the bit and shifting it to
	182	* bit position 1 so the result has the value 0 or 2.
	183	*/
	184	hdrlen += (fc & IEEE80211_STYPE_QOS_DATA)
	185	>> (ilog2(IEEE80211_STYPE_QOS_DATA)-1);
	186	break;
	187	case IEEE80211_FTYPE_CTL:
	188	/*
	189	* ACK and CTS are 10 bytes, all others 16. To see how
	190	* to get this condition consider
	191	* subtype mask: 0b0000000011110000 (0x00F0)
	192	* ACK subtype: 0b0000000011010000 (0x00D0)
	193	* CTS subtype: 0b0000000011000000 (0x00C0)
	194	* bits that matter: ^^^ (0x00E0)
	195	* value of those: 0b0000000011000000 (0x00C0)
	196	*/
	197	if ((fc & 0xE0) == 0xC0)
	198	hdrlen = 10;
	199	else
	200	hdrlen = 16;
	201	break;
	202	}
	203
	204	return hdrlen;
	205	}
	206	EXPORT_SYMBOL(ieee80211_get_hdrlen);
	207
	208	int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
	209	{
	210	const struct ieee80211_hdr hdr = (const struct ieee80211_hdr ) skb->data;
	211	int hdrlen;
	212
	213	if (unlikely(skb->len < 10))
	214	return 0;
	215	hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
	216	if (unlikely(hdrlen > skb->len))
	217	return 0;
	218	return hdrlen;
	219	}
	220	EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
	221
c2d1560a JB	222	void ieee80211_tx_set_iswep(struct ieee80211_txrx_data *tx)
	223	{
	224	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) tx->skb->data;
	225
	226	hdr->frame_control \|= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	227	if (tx->u.tx.extra_frag) {
	228	struct ieee80211_hdr *fhdr;
	229	int i;
	230	for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
	231	fhdr = (struct ieee80211_hdr *)
	232	tx->u.tx.extra_frag[i]->data;
	233	fhdr->frame_control \|= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	234	}
	235	}
	236	}
	237
	238	int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
	239	int rate, int erp, int short_preamble)
	240	{
	241	int dur;
	242
	243	/* calculate duration (in microseconds, rounded up to next higher
	244	* integer if it includes a fractional microsecond) to send frame of
	245	* len bytes (does not include FCS) at the given rate. Duration will
	246	* also include SIFS.
	247	*
	248	* rate is in 100 kbps, so divident is multiplied by 10 in the
	249	* DIV_ROUND_UP() operations.
	250	*/
	251
b708e610	252	if (local->hw.conf.phymode == MODE_IEEE80211A \|\| erp) {
c2d1560a JB	253	/*
	254	* OFDM:
	255	*
	256	* N_DBPS = DATARATE x 4
	257	* N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
	258	* (16 = SIGNAL time, 6 = tail bits)
	259	* TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
	260	*
	261	* T_SYM = 4 usec
	262	* 802.11a - 17.5.2: aSIFSTime = 16 usec
	263	* 802.11g - 19.8.4: aSIFSTime = 10 usec +
	264	* signal ext = 6 usec
	265	*/
c2d1560a JB	266	dur = 16; /* SIFS + signal ext */
	267	dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
	268	dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
	269	dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
	270	4 * rate); /* T_SYM x N_SYM */
	271	} else {
	272	/*
	273	* 802.11b or 802.11g with 802.11b compatibility:
	274	* 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
	275	* Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
	276	*
	277	* 802.11 (DS): 15.3.3, 802.11b: 18.3.4
	278	* aSIFSTime = 10 usec
	279	* aPreambleLength = 144 usec or 72 usec with short preamble
	280	* aPLCPHeaderLength = 48 usec or 24 usec with short preamble
	281	*/
	282	dur = 10; /* aSIFSTime = 10 usec */
	283	dur += short_preamble ? (72 + 24) : (144 + 48);
	284
	285	dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
	286	}
	287
	288	return dur;
	289	}
	290
	291	/* Exported duration function for driver use */
7e9ed188	292	__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw, int if_id,
c2d1560a JB	293	size_t frame_len, int rate)
	294	{
	295	struct ieee80211_local *local = hw_to_local(hw);
881d966b	296	struct net_device *bdev = dev_get_by_index(&init_net, if_id);
7e9ed188	297	struct ieee80211_sub_if_data *sdata;
c2d1560a JB	298	u16 dur;
	299	int erp;
	300
7e9ed188 DD	301	if (unlikely(!bdev))
	302	return 0;
	303
	304	sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
c2d1560a JB	305	erp = ieee80211_is_erp_rate(hw->conf.phymode, rate);
c2d1560a JB	306	dur = ieee80211_frame_duration(local, frame_len, rate,
13262ffd	307	erp, sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE);
c2d1560a	308
7e9ed188	309	dev_put(bdev);
c2d1560a JB	310	return cpu_to_le16(dur);
	311	}
	312	EXPORT_SYMBOL(ieee80211_generic_frame_duration);
	313
7e9ed188	314	__le16 ieee80211_rts_duration(struct ieee80211_hw *hw, int if_id,
c2d1560a JB	315	size_t frame_len,
	316	const struct ieee80211_tx_control *frame_txctl)
	317	{
	318	struct ieee80211_local *local = hw_to_local(hw);
	319	struct ieee80211_rate *rate;
881d966b	320	struct net_device *bdev = dev_get_by_index(&init_net, if_id);
7e9ed188 DD	321	struct ieee80211_sub_if_data *sdata;
7e9ed188 DD	322	int short_preamble;
c2d1560a JB	323	int erp;
	324	u16 dur;
	325
7e9ed188 DD	326	if (unlikely(!bdev))
	327	return 0;
	328
	329	sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
13262ffd	330	short_preamble = sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE;
7e9ed188	331
c2d1560a JB	332	rate = frame_txctl->rts_rate;
	333	erp = !!(rate->flags & IEEE80211_RATE_ERP);
	334
	335	/* CTS duration */
	336	dur = ieee80211_frame_duration(local, 10, rate->rate,
	337	erp, short_preamble);
	338	/* Data frame duration */
	339	dur += ieee80211_frame_duration(local, frame_len, rate->rate,
	340	erp, short_preamble);
	341	/* ACK duration */
	342	dur += ieee80211_frame_duration(local, 10, rate->rate,
	343	erp, short_preamble);
	344
7e9ed188	345	dev_put(bdev);
c2d1560a JB	346	return cpu_to_le16(dur);
	347	}
	348	EXPORT_SYMBOL(ieee80211_rts_duration);
	349
7e9ed188	350	__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw, int if_id,
c2d1560a JB	351	size_t frame_len,
	352	const struct ieee80211_tx_control *frame_txctl)
	353	{
	354	struct ieee80211_local *local = hw_to_local(hw);
	355	struct ieee80211_rate *rate;
881d966b	356	struct net_device *bdev = dev_get_by_index(&init_net, if_id);
7e9ed188 DD	357	struct ieee80211_sub_if_data *sdata;
7e9ed188 DD	358	int short_preamble;
c2d1560a JB	359	int erp;
	360	u16 dur;
	361
7e9ed188 DD	362	if (unlikely(!bdev))
	363	return 0;
	364
	365	sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
13262ffd	366	short_preamble = sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE;
7e9ed188	367
c2d1560a JB	368	rate = frame_txctl->rts_rate;
	369	erp = !!(rate->flags & IEEE80211_RATE_ERP);
	370
	371	/* Data frame duration */
	372	dur = ieee80211_frame_duration(local, frame_len, rate->rate,
	373	erp, short_preamble);
	374	if (!(frame_txctl->flags & IEEE80211_TXCTL_NO_ACK)) {
	375	/* ACK duration */
	376	dur += ieee80211_frame_duration(local, 10, rate->rate,
	377	erp, short_preamble);
	378	}
	379
7e9ed188	380	dev_put(bdev);
c2d1560a JB	381	return cpu_to_le16(dur);
	382	}
	383	EXPORT_SYMBOL(ieee80211_ctstoself_duration);
	384
	385	struct ieee80211_rate *
	386	ieee80211_get_rate(struct ieee80211_local *local, int phymode, int hw_rate)
	387	{
	388	struct ieee80211_hw_mode *mode;
	389	int r;
	390
	391	list_for_each_entry(mode, &local->modes_list, list) {
	392	if (mode->mode != phymode)
	393	continue;
	394	for (r = 0; r < mode->num_rates; r++) {
	395	struct ieee80211_rate *rate = &mode->rates[r];
	396	if (rate->val == hw_rate \|\|
	397	(rate->flags & IEEE80211_RATE_PREAMBLE2 &&
	398	rate->val2 == hw_rate))
	399	return rate;
	400	}
	401	}
	402
	403	return NULL;
	404	}
	405
	406	void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
	407	{
	408	struct ieee80211_local *local = hw_to_local(hw);
	409
	410	if (test_and_clear_bit(IEEE80211_LINK_STATE_XOFF,
	411	&local->state[queue])) {
	412	if (test_bit(IEEE80211_LINK_STATE_PENDING,
	413	&local->state[queue]))
	414	tasklet_schedule(&local->tx_pending_tasklet);
	415	else
	416	if (!ieee80211_qdisc_installed(local->mdev)) {
	417	if (queue == 0)
	418	netif_wake_queue(local->mdev);
	419	} else
	420	__netif_schedule(local->mdev);
	421	}
	422	}
	423	EXPORT_SYMBOL(ieee80211_wake_queue);
	424
	425	void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
	426	{
	427	struct ieee80211_local *local = hw_to_local(hw);
	428
	429	if (!ieee80211_qdisc_installed(local->mdev) && queue == 0)
	430	netif_stop_queue(local->mdev);
	431	set_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
	432	}
	433	EXPORT_SYMBOL(ieee80211_stop_queue);
	434
	435	void ieee80211_start_queues(struct ieee80211_hw *hw)
	436	{
	437	struct ieee80211_local *local = hw_to_local(hw);
	438	int i;
	439
	440	for (i = 0; i < local->hw.queues; i++)
	441	clear_bit(IEEE80211_LINK_STATE_XOFF, &local->state[i]);
	442	if (!ieee80211_qdisc_installed(local->mdev))
	443	netif_start_queue(local->mdev);
	444	}
445	EXPORT_SYMBOL(ieee80211_start_queues);
446
447	void ieee80211_stop_queues(struct ieee80211_hw *hw)
448	{
449	int i;
450
451	for (i = 0; i < hw->queues; i++)
452	ieee80211_stop_queue(hw, i);
453	}
454	EXPORT_SYMBOL(ieee80211_stop_queues);
455
456	void ieee80211_wake_queues(struct ieee80211_hw *hw)
457	{
458	int i;
459
460	for (i = 0; i < hw->queues; i++)
461	ieee80211_wake_queue(hw, i);
462	}
463	EXPORT_SYMBOL(ieee80211_wake_queues);
dabeb344 JB	464
	465	void ieee80211_iterate_active_interfaces(struct ieee80211_hw *hw,
	466	void (iterator)(void data, u8 *mac,
	467	int if_id),
	468	void *data)
	469	{
	470	struct ieee80211_local *local = hw_to_local(hw);
	471	struct ieee80211_sub_if_data *sdata;
	472
e38bad47	473	rcu_read_lock();
dabeb344	474
e38bad47	475	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
dabeb344 JB	476	switch (sdata->type) {
	477	case IEEE80211_IF_TYPE_INVALID:
	478	case IEEE80211_IF_TYPE_MNTR:
	479	case IEEE80211_IF_TYPE_VLAN:
	480	continue;
	481	case IEEE80211_IF_TYPE_AP:
	482	case IEEE80211_IF_TYPE_STA:
	483	case IEEE80211_IF_TYPE_IBSS:
	484	case IEEE80211_IF_TYPE_WDS:
	485	break;
	486	}
	487	if (sdata->dev == local->mdev)
	488	continue;
	489	if (netif_running(sdata->dev))
	490	iterator(data, sdata->dev->dev_addr,
	491	sdata->dev->ifindex);
	492	}
e38bad47 JB	493
e38bad47 JB	494	rcu_read_unlock();
dabeb344 JB	495	}
dabeb344 JB	496	EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);