util.c 25.1 KB
Newer Older
Johannes Berg's avatar
Johannes Berg committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
/*
 * 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>
23
#include <net/net_namespace.h>
Johannes Berg's avatar
Johannes Berg committed
24
#include <net/cfg80211.h>
25
#include <net/rtnetlink.h>
Johannes Berg's avatar
Johannes Berg committed
26 27

#include "ieee80211_i.h"
Johannes Berg's avatar
Johannes Berg committed
28
#include "rate.h"
29
#include "mesh.h"
Johannes Berg's avatar
Johannes Berg committed
30 31 32 33 34 35 36
#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) */
37
const unsigned char rfc1042_header[] __aligned(2) =
Johannes Berg's avatar
Johannes Berg committed
38 39 40
	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };

/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
41
const unsigned char bridge_tunnel_header[] __aligned(2) =
Johannes Berg's avatar
Johannes Berg committed
42 43
	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };

44 45 46 47 48 49 50 51 52
struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
{
	struct ieee80211_local *local;
	BUG_ON(!wiphy);

	local = wiphy_priv(wiphy);
	return &local->hw;
}
EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
Johannes Berg's avatar
Johannes Berg committed
53

54
u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
55
			enum nl80211_iftype type)
Johannes Berg's avatar
Johannes Berg committed
56
{
57
	__le16 fc = hdr->frame_control;
Johannes Berg's avatar
Johannes Berg committed
58

59 60
	 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
	if (len < 16)
Johannes Berg's avatar
Johannes Berg committed
61 62
		return NULL;

63
	if (ieee80211_is_data(fc)) {
64 65
		if (len < 24) /* drop incorrect hdr len (data) */
			return NULL;
66 67

		if (ieee80211_has_a4(fc))
Johannes Berg's avatar
Johannes Berg committed
68
			return NULL;
69 70 71
		if (ieee80211_has_tods(fc))
			return hdr->addr1;
		if (ieee80211_has_fromds(fc))
Johannes Berg's avatar
Johannes Berg committed
72
			return hdr->addr2;
73 74 75 76 77

		return hdr->addr3;
	}

	if (ieee80211_is_mgmt(fc)) {
78 79
		if (len < 24) /* drop incorrect hdr len (mgmt) */
			return NULL;
Johannes Berg's avatar
Johannes Berg committed
80
		return hdr->addr3;
81 82 83 84
	}

	if (ieee80211_is_ctl(fc)) {
		if(ieee80211_is_pspoll(fc))
Johannes Berg's avatar
Johannes Berg committed
85
			return hdr->addr1;
86 87

		if (ieee80211_is_back_req(fc)) {
88
			switch (type) {
89
			case NL80211_IFTYPE_STATION:
90
				return hdr->addr2;
91 92
			case NL80211_IFTYPE_AP:
			case NL80211_IFTYPE_AP_VLAN:
93 94
				return hdr->addr1;
			default:
95
				break; /* fall through to the return */
96 97
			}
		}
Johannes Berg's avatar
Johannes Berg committed
98 99 100 101 102
	}

	return NULL;
}

103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134
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);

135
unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
Johannes Berg's avatar
Johannes Berg committed
136
{
137 138
	const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)skb->data;
	unsigned int hdrlen;
Johannes Berg's avatar
Johannes Berg committed
139 140 141

	if (unlikely(skb->len < 10))
		return 0;
142
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg's avatar
Johannes Berg committed
143 144 145 146 147 148
	if (unlikely(hdrlen > skb->len))
		return 0;
	return hdrlen;
}
EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);

149 150 151 152 153 154
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:
155
		return 6;
156
	case 1:
157
		return 12;
158
	case 2:
159
		return 18;
160
	case 3:
161
		return 24;
162
	default:
163
		return 6;
164 165 166
	}
}

167
void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
Johannes Berg's avatar
Johannes Berg committed
168
{
169 170 171 172 173 174 175
	struct sk_buff *skb = tx->skb;
	struct ieee80211_hdr *hdr;

	do {
		hdr = (struct ieee80211_hdr *) skb->data;
		hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	} while ((skb = skb->next));
Johannes Berg's avatar
Johannes Berg committed
176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191
}

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.
	 */

192
	if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
Johannes Berg's avatar
Johannes Berg committed
193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231
		/*
		 * 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 */
232 233
__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif,
234 235
					size_t frame_len,
					struct ieee80211_rate *rate)
Johannes Berg's avatar
Johannes Berg committed
236 237
{
	struct ieee80211_local *local = hw_to_local(hw);
238
	struct ieee80211_sub_if_data *sdata;
Johannes Berg's avatar
Johannes Berg committed
239 240
	u16 dur;
	int erp;
241
	bool short_preamble = false;
Johannes Berg's avatar
Johannes Berg committed
242

243
	erp = 0;
244 245
	if (vif) {
		sdata = vif_to_sdata(vif);
246
		short_preamble = sdata->vif.bss_conf.use_short_preamble;
247 248 249
		if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
			erp = rate->flags & IEEE80211_RATE_ERP_G;
	}
250 251

	dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
252
				       short_preamble);
Johannes Berg's avatar
Johannes Berg committed
253 254 255 256 257

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

258 259
__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
			      struct ieee80211_vif *vif, size_t frame_len,
260
			      const struct ieee80211_tx_info *frame_txctl)
Johannes Berg's avatar
Johannes Berg committed
261 262 263
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_rate *rate;
264
	struct ieee80211_sub_if_data *sdata;
265
	bool short_preamble;
Johannes Berg's avatar
Johannes Berg committed
266 267
	int erp;
	u16 dur;
268 269 270
	struct ieee80211_supported_band *sband;

	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
Johannes Berg's avatar
Johannes Berg committed
271

272
	short_preamble = false;
273

274
	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
275 276

	erp = 0;
277 278
	if (vif) {
		sdata = vif_to_sdata(vif);
279
		short_preamble = sdata->vif.bss_conf.use_short_preamble;
280 281 282
		if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
			erp = rate->flags & IEEE80211_RATE_ERP_G;
	}
Johannes Berg's avatar
Johannes Berg committed
283 284

	/* CTS duration */
285
	dur = ieee80211_frame_duration(local, 10, rate->bitrate,
Johannes Berg's avatar
Johannes Berg committed
286 287
				       erp, short_preamble);
	/* Data frame duration */
288
	dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
Johannes Berg's avatar
Johannes Berg committed
289 290
					erp, short_preamble);
	/* ACK duration */
291
	dur += ieee80211_frame_duration(local, 10, rate->bitrate,
Johannes Berg's avatar
Johannes Berg committed
292 293 294 295 296 297
					erp, short_preamble);

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

298 299
__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
				    struct ieee80211_vif *vif,
Johannes Berg's avatar
Johannes Berg committed
300
				    size_t frame_len,
301
				    const struct ieee80211_tx_info *frame_txctl)
Johannes Berg's avatar
Johannes Berg committed
302 303 304
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_rate *rate;
305
	struct ieee80211_sub_if_data *sdata;
306
	bool short_preamble;
Johannes Berg's avatar
Johannes Berg committed
307 308
	int erp;
	u16 dur;
309 310 311
	struct ieee80211_supported_band *sband;

	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
Johannes Berg's avatar
Johannes Berg committed
312

313
	short_preamble = false;
314

315
	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
316
	erp = 0;
317 318
	if (vif) {
		sdata = vif_to_sdata(vif);
319
		short_preamble = sdata->vif.bss_conf.use_short_preamble;
320 321 322
		if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
			erp = rate->flags & IEEE80211_RATE_ERP_G;
	}
Johannes Berg's avatar
Johannes Berg committed
323 324

	/* Data frame duration */
325
	dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
Johannes Berg's avatar
Johannes Berg committed
326
				       erp, short_preamble);
327
	if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
Johannes Berg's avatar
Johannes Berg committed
328
		/* ACK duration */
329
		dur += ieee80211_frame_duration(local, 10, rate->bitrate,
Johannes Berg's avatar
Johannes Berg committed
330 331 332 333 334 335 336
						erp, short_preamble);
	}

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

337 338
static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
				   enum queue_stop_reason reason)
Johannes Berg's avatar
Johannes Berg committed
339 340 341
{
	struct ieee80211_local *local = hw_to_local(hw);

342 343 344 345 346 347 348 349 350 351 352 353 354 355
	if (queue >= hw->queues) {
		if (local->ampdu_ac_queue[queue - hw->queues] < 0)
			return;

		/*
		 * for virtual aggregation queues, we need to refcount the
		 * internal mac80211 disable (multiple times!), keep track of
		 * driver disable _and_ make sure the regular queue is
		 * actually enabled.
		 */
		if (reason == IEEE80211_QUEUE_STOP_REASON_AGGREGATION)
			local->amdpu_ac_stop_refcnt[queue - hw->queues]--;
		else
			__clear_bit(reason, &local->queue_stop_reasons[queue]);
356

357 358
		if (local->queue_stop_reasons[queue] ||
		    local->amdpu_ac_stop_refcnt[queue - hw->queues])
359
			return;
360 361 362 363

		/* now go on to treat the corresponding regular queue */
		queue = local->ampdu_ac_queue[queue - hw->queues];
		reason = IEEE80211_QUEUE_STOP_REASON_AGGREGATION;
364 365
	}

366 367
	__clear_bit(reason, &local->queue_stop_reasons[queue]);

368 369 370 371 372
	if (!skb_queue_empty(&local->pending[queue]) &&
	    local->queue_stop_reasons[queue] ==
				BIT(IEEE80211_QUEUE_STOP_REASON_PENDING))
		tasklet_schedule(&local->tx_pending_tasklet);

373 374 375 376
	if (local->queue_stop_reasons[queue] != 0)
		/* someone still has this queue stopped */
		return;

377
	netif_wake_subqueue(local->mdev, queue);
Johannes Berg's avatar
Johannes Berg committed
378
}
379

380 381
void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
				    enum queue_stop_reason reason)
382 383 384 385 386 387 388 389 390 391 392 393 394 395
{
	struct ieee80211_local *local = hw_to_local(hw);
	unsigned long flags;

	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	__ieee80211_wake_queue(hw, queue, reason);
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
}

void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
{
	ieee80211_wake_queue_by_reason(hw, queue,
				       IEEE80211_QUEUE_STOP_REASON_DRIVER);
}
Johannes Berg's avatar
Johannes Berg committed
396 397
EXPORT_SYMBOL(ieee80211_wake_queue);

398 399
static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
				   enum queue_stop_reason reason)
Johannes Berg's avatar
Johannes Berg committed
400 401 402
{
	struct ieee80211_local *local = hw_to_local(hw);

403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422
	if (queue >= hw->queues) {
		if (local->ampdu_ac_queue[queue - hw->queues] < 0)
			return;

		/*
		 * for virtual aggregation queues, we need to refcount the
		 * internal mac80211 disable (multiple times!), keep track of
		 * driver disable _and_ make sure the regular queue is
		 * actually enabled.
		 */
		if (reason == IEEE80211_QUEUE_STOP_REASON_AGGREGATION)
			local->amdpu_ac_stop_refcnt[queue - hw->queues]++;
		else
			__set_bit(reason, &local->queue_stop_reasons[queue]);

		/* now go on to treat the corresponding regular queue */
		queue = local->ampdu_ac_queue[queue - hw->queues];
		reason = IEEE80211_QUEUE_STOP_REASON_AGGREGATION;
	}

423 424 425 426 427 428 429
	/*
	 * Only stop if it was previously running, this is necessary
	 * for correct pending packets handling because there we may
	 * start (but not wake) the queue and rely on that.
	 */
	if (!local->queue_stop_reasons[queue])
		netif_stop_subqueue(local->mdev, queue);
430

431
	__set_bit(reason, &local->queue_stop_reasons[queue]);
Johannes Berg's avatar
Johannes Berg committed
432
}
433

434 435
void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
				    enum queue_stop_reason reason)
436 437 438 439 440 441 442 443 444 445 446 447 448 449
{
	struct ieee80211_local *local = hw_to_local(hw);
	unsigned long flags;

	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	__ieee80211_stop_queue(hw, queue, reason);
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
}

void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
{
	ieee80211_stop_queue_by_reason(hw, queue,
				       IEEE80211_QUEUE_STOP_REASON_DRIVER);
}
Johannes Berg's avatar
Johannes Berg committed
450 451
EXPORT_SYMBOL(ieee80211_stop_queue);

452 453
void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
				    enum queue_stop_reason reason)
Johannes Berg's avatar
Johannes Berg committed
454
{
455 456
	struct ieee80211_local *local = hw_to_local(hw);
	unsigned long flags;
Johannes Berg's avatar
Johannes Berg committed
457 458
	int i;

459 460
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);

461
	for (i = 0; i < hw->queues; i++)
462 463 464 465 466 467 468 469 470
		__ieee80211_stop_queue(hw, i, reason);

	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
}

void ieee80211_stop_queues(struct ieee80211_hw *hw)
{
	ieee80211_stop_queues_by_reason(hw,
					IEEE80211_QUEUE_STOP_REASON_DRIVER);
Johannes Berg's avatar
Johannes Berg committed
471 472 473
}
EXPORT_SYMBOL(ieee80211_stop_queues);

474 475 476
int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
{
	struct ieee80211_local *local = hw_to_local(hw);
477 478 479 480 481 482 483 484 485 486
	unsigned long flags;

	if (queue >= hw->queues) {
		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		queue = local->ampdu_ac_queue[queue - hw->queues];
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
		if (queue < 0)
			return true;
	}

487 488 489 490
	return __netif_subqueue_stopped(local->mdev, queue);
}
EXPORT_SYMBOL(ieee80211_queue_stopped);

491 492
void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
				     enum queue_stop_reason reason)
Johannes Berg's avatar
Johannes Berg committed
493
{
494 495
	struct ieee80211_local *local = hw_to_local(hw);
	unsigned long flags;
Johannes Berg's avatar
Johannes Berg committed
496 497
	int i;

498 499
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);

500
	for (i = 0; i < hw->queues + hw->ampdu_queues; i++)
501 502 503 504 505 506 507 508
		__ieee80211_wake_queue(hw, i, reason);

	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
}

void ieee80211_wake_queues(struct ieee80211_hw *hw)
{
	ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
Johannes Berg's avatar
Johannes Berg committed
509 510
}
EXPORT_SYMBOL(ieee80211_wake_queues);
511

512 513 514 515 516
void ieee80211_iterate_active_interfaces(
	struct ieee80211_hw *hw,
	void (*iterator)(void *data, u8 *mac,
			 struct ieee80211_vif *vif),
	void *data)
517 518 519 520
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_sub_if_data *sdata;

521
	mutex_lock(&local->iflist_mtx);
522 523 524

	list_for_each_entry(sdata, &local->interfaces, list) {
		switch (sdata->vif.type) {
525 526 527 528
		case __NL80211_IFTYPE_AFTER_LAST:
		case NL80211_IFTYPE_UNSPECIFIED:
		case NL80211_IFTYPE_MONITOR:
		case NL80211_IFTYPE_AP_VLAN:
529
			continue;
530 531 532 533 534
		case NL80211_IFTYPE_AP:
		case NL80211_IFTYPE_STATION:
		case NL80211_IFTYPE_ADHOC:
		case NL80211_IFTYPE_WDS:
		case NL80211_IFTYPE_MESH_POINT:
535 536 537 538 539 540 541
			break;
		}
		if (netif_running(sdata->dev))
			iterator(data, sdata->dev->dev_addr,
				 &sdata->vif);
	}

542
	mutex_unlock(&local->iflist_mtx);
543 544 545 546 547 548 549 550 551 552 553 554
}
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;

555
	rcu_read_lock();
556

557
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
558
		switch (sdata->vif.type) {
559 560 561 562
		case __NL80211_IFTYPE_AFTER_LAST:
		case NL80211_IFTYPE_UNSPECIFIED:
		case NL80211_IFTYPE_MONITOR:
		case NL80211_IFTYPE_AP_VLAN:
563
			continue;
564 565 566 567 568
		case NL80211_IFTYPE_AP:
		case NL80211_IFTYPE_STATION:
		case NL80211_IFTYPE_ADHOC:
		case NL80211_IFTYPE_WDS:
		case NL80211_IFTYPE_MESH_POINT:
569 570 571 572
			break;
		}
		if (netif_running(sdata->dev))
			iterator(data, sdata->dev->dev_addr,
573
				 &sdata->vif);
574
	}
575 576

	rcu_read_unlock();
577
}
578
EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664

void ieee802_11_parse_elems(u8 *start, size_t len,
			    struct ieee802_11_elems *elems)
{
	size_t left = len;
	u8 *pos = start;

	memset(elems, 0, sizeof(*elems));
	elems->ie_start = start;
	elems->total_len = len;

	while (left >= 2) {
		u8 id, elen;

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

		if (elen > left)
			return;

		switch (id) {
		case WLAN_EID_SSID:
			elems->ssid = pos;
			elems->ssid_len = elen;
			break;
		case WLAN_EID_SUPP_RATES:
			elems->supp_rates = pos;
			elems->supp_rates_len = elen;
			break;
		case WLAN_EID_FH_PARAMS:
			elems->fh_params = pos;
			elems->fh_params_len = elen;
			break;
		case WLAN_EID_DS_PARAMS:
			elems->ds_params = pos;
			elems->ds_params_len = elen;
			break;
		case WLAN_EID_CF_PARAMS:
			elems->cf_params = pos;
			elems->cf_params_len = elen;
			break;
		case WLAN_EID_TIM:
			elems->tim = pos;
			elems->tim_len = elen;
			break;
		case WLAN_EID_IBSS_PARAMS:
			elems->ibss_params = pos;
			elems->ibss_params_len = elen;
			break;
		case WLAN_EID_CHALLENGE:
			elems->challenge = pos;
			elems->challenge_len = elen;
			break;
		case WLAN_EID_WPA:
			if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
			    pos[2] == 0xf2) {
				/* Microsoft OUI (00:50:F2) */
				if (pos[3] == 1) {
					/* OUI Type 1 - WPA IE */
					elems->wpa = pos;
					elems->wpa_len = elen;
				} else if (elen >= 5 && pos[3] == 2) {
					if (pos[4] == 0) {
						elems->wmm_info = pos;
						elems->wmm_info_len = elen;
					} else if (pos[4] == 1) {
						elems->wmm_param = pos;
						elems->wmm_param_len = elen;
					}
				}
			}
			break;
		case WLAN_EID_RSN:
			elems->rsn = pos;
			elems->rsn_len = elen;
			break;
		case WLAN_EID_ERP_INFO:
			elems->erp_info = pos;
			elems->erp_info_len = elen;
			break;
		case WLAN_EID_EXT_SUPP_RATES:
			elems->ext_supp_rates = pos;
			elems->ext_supp_rates_len = elen;
			break;
		case WLAN_EID_HT_CAPABILITY:
665 666
			if (elen >= sizeof(struct ieee80211_ht_cap))
				elems->ht_cap_elem = (void *)pos;
667
			break;
668 669
		case WLAN_EID_HT_INFORMATION:
			if (elen >= sizeof(struct ieee80211_ht_info))
670
				elems->ht_info_elem = (void *)pos;
671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714
			break;
		case WLAN_EID_MESH_ID:
			elems->mesh_id = pos;
			elems->mesh_id_len = elen;
			break;
		case WLAN_EID_MESH_CONFIG:
			elems->mesh_config = pos;
			elems->mesh_config_len = elen;
			break;
		case WLAN_EID_PEER_LINK:
			elems->peer_link = pos;
			elems->peer_link_len = elen;
			break;
		case WLAN_EID_PREQ:
			elems->preq = pos;
			elems->preq_len = elen;
			break;
		case WLAN_EID_PREP:
			elems->prep = pos;
			elems->prep_len = elen;
			break;
		case WLAN_EID_PERR:
			elems->perr = pos;
			elems->perr_len = elen;
			break;
		case WLAN_EID_CHANNEL_SWITCH:
			elems->ch_switch_elem = pos;
			elems->ch_switch_elem_len = elen;
			break;
		case WLAN_EID_QUIET:
			if (!elems->quiet_elem) {
				elems->quiet_elem = pos;
				elems->quiet_elem_len = elen;
			}
			elems->num_of_quiet_elem++;
			break;
		case WLAN_EID_COUNTRY:
			elems->country_elem = pos;
			elems->country_elem_len = elen;
			break;
		case WLAN_EID_PWR_CONSTRAINT:
			elems->pwr_constr_elem = pos;
			elems->pwr_constr_elem_len = elen;
			break;
715 716 717
		case WLAN_EID_TIMEOUT_INTERVAL:
			elems->timeout_int = pos;
			elems->timeout_int_len = elen;
718
			break;
719 720 721 722 723 724 725 726
		default:
			break;
		}

		left -= elen;
		pos += elen;
	}
}
727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752

void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_tx_queue_params qparam;
	int i;

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

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

	qparam.aifs = 2;

	if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
	    !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
		qparam.cw_min = 31;
	else
		qparam.cw_min = 15;

	qparam.cw_max = 1023;
	qparam.txop = 0;

	for (i = 0; i < local_to_hw(local)->queues; i++)
		local->ops->conf_tx(local_to_hw(local), i, &qparam);
}
753

754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774
void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
				  const size_t supp_rates_len,
				  const u8 *supp_rates)
{
	struct ieee80211_local *local = sdata->local;
	int i, have_higher_than_11mbit = 0;

	/* cf. IEEE 802.11 9.2.12 */
	for (i = 0; i < supp_rates_len; i++)
		if ((supp_rates[i] & 0x7f) * 5 > 110)
			have_higher_than_11mbit = 1;

	if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
	    have_higher_than_11mbit)
		sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
	else
		sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

	ieee80211_set_wmm_default(sdata);
}

775 776 777 778 779 780 781 782 783 784 785 786 787
void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
		      int encrypt)
{
	skb->dev = sdata->local->mdev;
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

	skb->iif = sdata->dev->ifindex;
	skb->do_not_encrypt = !encrypt;

	dev_queue_xmit(skb);
}
788 789 790 791 792 793 794 795 796 797

int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
{
	int ret = -EINVAL;
	struct ieee80211_channel *chan;
	struct ieee80211_local *local = sdata->local;

	chan = ieee80211_get_channel(local->hw.wiphy, freqMHz);

	if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
798
		if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
799
		    chan->flags & IEEE80211_CHAN_NO_IBSS)
800 801
			return ret;
		local->oper_channel = chan;
Sujith's avatar
Sujith committed
802
		local->oper_channel_type = NL80211_CHAN_NO_HT;
803

804
		if (local->sw_scanning || local->hw_scanning)
805 806
			ret = 0;
		else
807 808
			ret = ieee80211_hw_config(
				local, IEEE80211_CONF_CHANGE_CHANNEL);
809 810 811 812
	}

	return ret;
}
813

814
u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
815 816 817 818
			      enum ieee80211_band band)
{
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *bitrates;
819
	u32 mandatory_rates;
820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840
	enum ieee80211_rate_flags mandatory_flag;
	int i;

	sband = local->hw.wiphy->bands[band];
	if (!sband) {
		WARN_ON(1);
		sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
	}

	if (band == IEEE80211_BAND_2GHZ)
		mandatory_flag = IEEE80211_RATE_MANDATORY_B;
	else
		mandatory_flag = IEEE80211_RATE_MANDATORY_A;

	bitrates = sband->bitrates;
	mandatory_rates = 0;
	for (i = 0; i < sband->n_bitrates; i++)
		if (bitrates[i].flags & mandatory_flag)
			mandatory_rates |= BIT(i);
	return mandatory_rates;
}
841 842 843 844 845 846 847 848 849 850 851

void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
			 u16 transaction, u16 auth_alg,
			 u8 *extra, size_t extra_len,
			 const u8 *bssid, int encrypt)
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
852
			    sizeof(*mgmt) + 6 + extra_len);
853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
		       "frame\n", sdata->dev->name);
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
	memset(mgmt, 0, 24 + 6);
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_AUTH);
	if (encrypt)
		mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	memcpy(mgmt->da, bssid, ETH_ALEN);
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
	memcpy(mgmt->bssid, bssid, ETH_ALEN);
	mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
	mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
	mgmt->u.auth.status_code = cpu_to_le16(0);
	if (extra)
		memcpy(skb_put(skb, extra_len), extra, extra_len);

	ieee80211_tx_skb(sdata, skb, encrypt);
}

void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
879 880
			      u8 *ssid, size_t ssid_len,
			      u8 *ie, size_t ie_len)
881 882 883 884 885
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
886 887
	u8 *pos, *supp_rates, *esupp_rates = NULL;
	int i;
888 889

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
890
			    ie_len);
891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
		       "request\n", sdata->dev->name);
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_PROBE_REQ);
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
	if (dst) {
		memcpy(mgmt->da, dst, ETH_ALEN);
		memcpy(mgmt->bssid, dst, ETH_ALEN);
	} else {
		memset(mgmt->da, 0xff, ETH_ALEN);
		memset(mgmt->bssid, 0xff, ETH_ALEN);
	}
	pos = skb_put(skb, 2 + ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = ssid_len;
	memcpy(pos, ssid, ssid_len);

	supp_rates = skb_put(skb, 2);
	supp_rates[0] = WLAN_EID_SUPP_RATES;
	supp_rates[1] = 0;
	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

	for (i = 0; i < sband->n_bitrates; i++) {
		struct ieee80211_rate *rate = &sband->bitrates[i];
		if (esupp_rates) {
			pos = skb_put(skb, 1);
			esupp_rates[1]++;
		} else if (supp_rates[1] == 8) {
			esupp_rates = skb_put(skb, 3);
			esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
			esupp_rates[1] = 1;
			pos = &esupp_rates[2];
		} else {
			pos = skb_put(skb, 1);
			supp_rates[1]++;
		}
		*pos = rate->bitrate / 5;
	}

937 938
	if (ie)
		memcpy(skb_put(skb, ie_len), ie, ie_len);
939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977

	ieee80211_tx_skb(sdata, skb, 0);
}

u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
			    struct ieee802_11_elems *elems,
			    enum ieee80211_band band)
{
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *bitrates;
	size_t num_rates;
	u32 supp_rates;
	int i, j;
	sband = local->hw.wiphy->bands[band];

	if (!sband) {
		WARN_ON(1);
		sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
	}

	bitrates = sband->bitrates;
	num_rates = sband->n_bitrates;
	supp_rates = 0;
	for (i = 0; i < elems->supp_rates_len +
		     elems->ext_supp_rates_len; i++) {
		u8 rate = 0;
		int own_rate;
		if (i < elems->supp_rates_len)
			rate = elems->supp_rates[i];
		else if (elems->ext_supp_rates)
			rate = elems->ext_supp_rates
				[i - elems->supp_rates_len];
		own_rate = 5 * (rate & 0x7f);
		for (j = 0; j < num_rates; j++)
			if (bitrates[j].bitrate == own_rate)
				supp_rates |= BIT(j);
	}
	return supp_rates;
}