util.c 34.1 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
/*
 * 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/bitmap.h>
22
#include <linux/crc32.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"
28
#include "driver-ops.h"
Johannes Berg's avatar
Johannes Berg committed
29
#include "rate.h"
30
#include "mesh.h"
Johannes Berg's avatar
Johannes Berg committed
31
#include "wme.h"
32
#include "led.h"
Johannes Berg's avatar
Johannes Berg committed
33
#include "wep.h"
Johannes Berg's avatar
Johannes Berg committed
34 35 36 37

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

38 39 40 41 42 43 44 45 46
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
47

48
u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
49
			enum nl80211_iftype type)
Johannes Berg's avatar
Johannes Berg committed
50
{
51
	__le16 fc = hdr->frame_control;
Johannes Berg's avatar
Johannes Berg committed
52

53 54
	 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
	if (len < 16)
Johannes Berg's avatar
Johannes Berg committed
55 56
		return NULL;

57
	if (ieee80211_is_data(fc)) {
58 59
		if (len < 24) /* drop incorrect hdr len (data) */
			return NULL;
60 61

		if (ieee80211_has_a4(fc))
Johannes Berg's avatar
Johannes Berg committed
62
			return NULL;
63 64 65
		if (ieee80211_has_tods(fc))
			return hdr->addr1;
		if (ieee80211_has_fromds(fc))
Johannes Berg's avatar
Johannes Berg committed
66
			return hdr->addr2;
67 68 69 70 71

		return hdr->addr3;
	}

	if (ieee80211_is_mgmt(fc)) {
72 73
		if (len < 24) /* drop incorrect hdr len (mgmt) */
			return NULL;
Johannes Berg's avatar
Johannes Berg committed
74
		return hdr->addr3;
75 76 77 78
	}

	if (ieee80211_is_ctl(fc)) {
		if(ieee80211_is_pspoll(fc))
Johannes Berg's avatar
Johannes Berg committed
79
			return hdr->addr1;
80 81

		if (ieee80211_is_back_req(fc)) {
82
			switch (type) {
83
			case NL80211_IFTYPE_STATION:
84
				return hdr->addr2;
85 86
			case NL80211_IFTYPE_AP:
			case NL80211_IFTYPE_AP_VLAN:
87 88
				return hdr->addr1;
			default:
89
				break; /* fall through to the return */
90 91
			}
		}
Johannes Berg's avatar
Johannes Berg committed
92 93 94 95 96
	}

	return NULL;
}

97
void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
Johannes Berg's avatar
Johannes Berg committed
98
{
99 100 101 102 103 104 105
	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
106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121
}

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.
	 */

122
	if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
Johannes Berg's avatar
Johannes Berg committed
123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161
		/*
		 * 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 */
162 163
__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif,
164 165
					size_t frame_len,
					struct ieee80211_rate *rate)
Johannes Berg's avatar
Johannes Berg committed
166 167
{
	struct ieee80211_local *local = hw_to_local(hw);
168
	struct ieee80211_sub_if_data *sdata;
Johannes Berg's avatar
Johannes Berg committed
169 170
	u16 dur;
	int erp;
171
	bool short_preamble = false;
Johannes Berg's avatar
Johannes Berg committed
172

173
	erp = 0;
174 175
	if (vif) {
		sdata = vif_to_sdata(vif);
176
		short_preamble = sdata->vif.bss_conf.use_short_preamble;
177 178 179
		if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
			erp = rate->flags & IEEE80211_RATE_ERP_G;
	}
180 181

	dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
182
				       short_preamble);
Johannes Berg's avatar
Johannes Berg committed
183 184 185 186 187

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

188 189
__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
			      struct ieee80211_vif *vif, size_t frame_len,
190
			      const struct ieee80211_tx_info *frame_txctl)
Johannes Berg's avatar
Johannes Berg committed
191 192 193
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_rate *rate;
194
	struct ieee80211_sub_if_data *sdata;
195
	bool short_preamble;
Johannes Berg's avatar
Johannes Berg committed
196 197
	int erp;
	u16 dur;
198 199 200
	struct ieee80211_supported_band *sband;

	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
Johannes Berg's avatar
Johannes Berg committed
201

202
	short_preamble = false;
203

204
	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
205 206

	erp = 0;
207 208
	if (vif) {
		sdata = vif_to_sdata(vif);
209
		short_preamble = sdata->vif.bss_conf.use_short_preamble;
210 211 212
		if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
			erp = rate->flags & IEEE80211_RATE_ERP_G;
	}
Johannes Berg's avatar
Johannes Berg committed
213 214

	/* CTS duration */
215
	dur = ieee80211_frame_duration(local, 10, rate->bitrate,
Johannes Berg's avatar
Johannes Berg committed
216 217
				       erp, short_preamble);
	/* Data frame duration */
218
	dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
Johannes Berg's avatar
Johannes Berg committed
219 220
					erp, short_preamble);
	/* ACK duration */
221
	dur += ieee80211_frame_duration(local, 10, rate->bitrate,
Johannes Berg's avatar
Johannes Berg committed
222 223 224 225 226 227
					erp, short_preamble);

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

228 229
__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
				    struct ieee80211_vif *vif,
Johannes Berg's avatar
Johannes Berg committed
230
				    size_t frame_len,
231
				    const struct ieee80211_tx_info *frame_txctl)
Johannes Berg's avatar
Johannes Berg committed
232 233 234
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_rate *rate;
235
	struct ieee80211_sub_if_data *sdata;
236
	bool short_preamble;
Johannes Berg's avatar
Johannes Berg committed
237 238
	int erp;
	u16 dur;
239 240 241
	struct ieee80211_supported_band *sband;

	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
Johannes Berg's avatar
Johannes Berg committed
242

243
	short_preamble = false;
244

245
	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
246
	erp = 0;
247 248
	if (vif) {
		sdata = vif_to_sdata(vif);
249
		short_preamble = sdata->vif.bss_conf.use_short_preamble;
250 251 252
		if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
			erp = rate->flags & IEEE80211_RATE_ERP_G;
	}
Johannes Berg's avatar
Johannes Berg committed
253 254

	/* Data frame duration */
255
	dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
Johannes Berg's avatar
Johannes Berg committed
256
				       erp, short_preamble);
257
	if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
Johannes Berg's avatar
Johannes Berg committed
258
		/* ACK duration */
259
		dur += ieee80211_frame_duration(local, 10, rate->bitrate,
Johannes Berg's avatar
Johannes Berg committed
260 261 262 263 264 265 266
						erp, short_preamble);
	}

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

267 268
static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
				   enum queue_stop_reason reason)
Johannes Berg's avatar
Johannes Berg committed
269 270 271
{
	struct ieee80211_local *local = hw_to_local(hw);

272 273
	if (WARN_ON(queue >= hw->queues))
		return;
274

275 276 277 278 279 280
	__clear_bit(reason, &local->queue_stop_reasons[queue]);

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

Johannes Berg's avatar
Johannes Berg committed
281 282
	if (!skb_queue_empty(&local->pending[queue]))
		tasklet_schedule(&local->tx_pending_tasklet);
Johannes Berg's avatar
Johannes Berg committed
283
}
284

285 286
void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
				    enum queue_stop_reason reason)
287 288 289 290 291 292 293 294 295 296 297 298 299 300
{
	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
301 302
EXPORT_SYMBOL(ieee80211_wake_queue);

303 304
static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
				   enum queue_stop_reason reason)
Johannes Berg's avatar
Johannes Berg committed
305 306 307
{
	struct ieee80211_local *local = hw_to_local(hw);

308 309
	if (WARN_ON(queue >= hw->queues))
		return;
310

311
	__set_bit(reason, &local->queue_stop_reasons[queue]);
Johannes Berg's avatar
Johannes Berg committed
312
}
313

314 315
void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
				    enum queue_stop_reason reason)
316 317 318 319 320 321 322 323 324 325 326 327 328 329
{
	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
330 331
EXPORT_SYMBOL(ieee80211_stop_queue);

332 333 334 335 336 337
void ieee80211_add_pending_skb(struct ieee80211_local *local,
			       struct sk_buff *skb)
{
	struct ieee80211_hw *hw = &local->hw;
	unsigned long flags;
	int queue = skb_get_queue_mapping(skb);
338 339 340
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

	if (WARN_ON(!info->control.vif)) {
341
		kfree_skb(skb);
342 343
		return;
	}
344 345 346

	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	__ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
Johannes Berg's avatar
Johannes Berg committed
347
	__skb_queue_tail(&local->pending[queue], skb);
348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365
	__ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
}

int ieee80211_add_pending_skbs(struct ieee80211_local *local,
			       struct sk_buff_head *skbs)
{
	struct ieee80211_hw *hw = &local->hw;
	struct sk_buff *skb;
	unsigned long flags;
	int queue, ret = 0, i;

	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	for (i = 0; i < hw->queues; i++)
		__ieee80211_stop_queue(hw, i,
			IEEE80211_QUEUE_STOP_REASON_SKB_ADD);

	while ((skb = skb_dequeue(skbs))) {
366 367 368
		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

		if (WARN_ON(!info->control.vif)) {
369
			kfree_skb(skb);
370 371 372
			continue;
		}

373 374
		ret++;
		queue = skb_get_queue_mapping(skb);
Johannes Berg's avatar
Johannes Berg committed
375
		__skb_queue_tail(&local->pending[queue], skb);
376 377
	}

Johannes Berg's avatar
Johannes Berg committed
378
	for (i = 0; i < hw->queues; i++)
379 380 381 382 383 384 385
		__ieee80211_wake_queue(hw, i,
			IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);

	return ret;
}

386 387
void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
				    enum queue_stop_reason reason)
Johannes Berg's avatar
Johannes Berg committed
388
{
389 390
	struct ieee80211_local *local = hw_to_local(hw);
	unsigned long flags;
Johannes Berg's avatar
Johannes Berg committed
391 392
	int i;

393 394
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);

395
	for (i = 0; i < hw->queues; i++)
396 397 398 399 400 401 402 403 404
		__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
405 406 407
}
EXPORT_SYMBOL(ieee80211_stop_queues);

408 409 410
int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
{
	struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg's avatar
Johannes Berg committed
411 412
	unsigned long flags;
	int ret;
413

414 415
	if (WARN_ON(queue >= hw->queues))
		return true;
416

Johannes Berg's avatar
Johannes Berg committed
417 418 419 420
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	ret = !!local->queue_stop_reasons[queue];
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
	return ret;
421 422 423
}
EXPORT_SYMBOL(ieee80211_queue_stopped);

424 425
void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
				     enum queue_stop_reason reason)
Johannes Berg's avatar
Johannes Berg committed
426
{
427 428
	struct ieee80211_local *local = hw_to_local(hw);
	unsigned long flags;
Johannes Berg's avatar
Johannes Berg committed
429 430
	int i;

431 432
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);

433
	for (i = 0; i < hw->queues; i++)
434 435 436 437 438 439 440 441
		__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
442 443
}
EXPORT_SYMBOL(ieee80211_wake_queues);
444

445 446 447 448 449
void ieee80211_iterate_active_interfaces(
	struct ieee80211_hw *hw,
	void (*iterator)(void *data, u8 *mac,
			 struct ieee80211_vif *vif),
	void *data)
450 451 452 453
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_sub_if_data *sdata;

454
	mutex_lock(&local->iflist_mtx);
455 456 457

	list_for_each_entry(sdata, &local->interfaces, list) {
		switch (sdata->vif.type) {
458 459 460 461
		case __NL80211_IFTYPE_AFTER_LAST:
		case NL80211_IFTYPE_UNSPECIFIED:
		case NL80211_IFTYPE_MONITOR:
		case NL80211_IFTYPE_AP_VLAN:
462
			continue;
463 464 465 466 467
		case NL80211_IFTYPE_AP:
		case NL80211_IFTYPE_STATION:
		case NL80211_IFTYPE_ADHOC:
		case NL80211_IFTYPE_WDS:
		case NL80211_IFTYPE_MESH_POINT:
468 469
			break;
		}
470
		if (ieee80211_sdata_running(sdata))
471
			iterator(data, sdata->vif.addr,
472 473 474
				 &sdata->vif);
	}

475
	mutex_unlock(&local->iflist_mtx);
476 477 478 479 480 481 482 483 484 485 486 487
}
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;

488
	rcu_read_lock();
489

490
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
491
		switch (sdata->vif.type) {
492 493 494 495
		case __NL80211_IFTYPE_AFTER_LAST:
		case NL80211_IFTYPE_UNSPECIFIED:
		case NL80211_IFTYPE_MONITOR:
		case NL80211_IFTYPE_AP_VLAN:
496
			continue;
497 498 499 500 501
		case NL80211_IFTYPE_AP:
		case NL80211_IFTYPE_STATION:
		case NL80211_IFTYPE_ADHOC:
		case NL80211_IFTYPE_WDS:
		case NL80211_IFTYPE_MESH_POINT:
502 503
			break;
		}
504
		if (ieee80211_sdata_running(sdata))
505
			iterator(data, sdata->vif.addr,
506
				 &sdata->vif);
507
	}
508 509

	rcu_read_unlock();
510
}
511
EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
512

513 514 515 516 517 518 519 520 521
/*
 * Nothing should have been stuffed into the workqueue during
 * the suspend->resume cycle. If this WARN is seen then there
 * is a bug with either the driver suspend or something in
 * mac80211 stuffing into the workqueue which we haven't yet
 * cleared during mac80211's suspend cycle.
 */
static bool ieee80211_can_queue_work(struct ieee80211_local *local)
{
Johannes Berg's avatar
Johannes Berg committed
522 523 524
	if (WARN(local->suspended && !local->resuming,
		 "queueing ieee80211 work while going to suspend\n"))
		return false;
525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552

	return true;
}

void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
{
	struct ieee80211_local *local = hw_to_local(hw);

	if (!ieee80211_can_queue_work(local))
		return;

	queue_work(local->workqueue, work);
}
EXPORT_SYMBOL(ieee80211_queue_work);

void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
				  struct delayed_work *dwork,
				  unsigned long delay)
{
	struct ieee80211_local *local = hw_to_local(hw);

	if (!ieee80211_can_queue_work(local))
		return;

	queue_delayed_work(local->workqueue, dwork, delay);
}
EXPORT_SYMBOL(ieee80211_queue_delayed_work);

553 554
void ieee802_11_parse_elems(u8 *start, size_t len,
			    struct ieee802_11_elems *elems)
555 556 557 558 559 560 561
{
	ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
}

u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
			       struct ieee802_11_elems *elems,
			       u64 filter, u32 crc)
562 563 564
{
	size_t left = len;
	u8 *pos = start;
565
	bool calc_crc = filter != 0;
566 567 568 569 570 571 572 573 574 575 576 577 578

	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)
579 580
			break;

581
		if (calc_crc && id < 64 && (filter & (1ULL << id)))
582
			crc = crc32_be(crc, pos - 2, elen + 2);
583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605

		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:
606 607 608 609
			if (elen >= sizeof(struct ieee80211_tim_ie)) {
				elems->tim = (void *)pos;
				elems->tim_len = elen;
			}
610 611 612 613 614 615 616 617 618
			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;
619
		case WLAN_EID_VENDOR_SPECIFIC:
620 621 622
			if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
			    pos[2] == 0xf2) {
				/* Microsoft OUI (00:50:F2) */
623 624 625 626

				if (calc_crc)
					crc = crc32_be(crc, pos - 2, elen + 2);

627 628 629 630 631
				if (pos[3] == 1) {
					/* OUI Type 1 - WPA IE */
					elems->wpa = pos;
					elems->wpa_len = elen;
				} else if (elen >= 5 && pos[3] == 2) {
632
					/* OUI Type 2 - WMM IE */
633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655
					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:
656 657
			if (elen >= sizeof(struct ieee80211_ht_cap))
				elems->ht_cap_elem = (void *)pos;
658
			break;
659 660
		case WLAN_EID_HT_INFORMATION:
			if (elen >= sizeof(struct ieee80211_ht_info))
661
				elems->ht_info_elem = (void *)pos;
662 663 664 665 666 667
			break;
		case WLAN_EID_MESH_ID:
			elems->mesh_id = pos;
			elems->mesh_id_len = elen;
			break;
		case WLAN_EID_MESH_CONFIG:
668 669
			if (elen >= sizeof(struct ieee80211_meshconf_ie))
				elems->mesh_config = (void *)pos;
670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686
			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;
687 688 689 690
		case WLAN_EID_RANN:
			if (elen >= sizeof(struct ieee80211_rann_ie))
				elems->rann = (void *)pos;
			break;
691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709
		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;
710 711 712
		case WLAN_EID_TIMEOUT_INTERVAL:
			elems->timeout_int = pos;
			elems->timeout_int_len = elen;
713
			break;
714 715 716 717 718 719 720
		default:
			break;
		}

		left -= elen;
		pos += elen;
	}
721 722

	return crc;
723
}
724 725 726 727 728

void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_tx_queue_params qparam;
729 730 731
	int queue;
	bool use_11b;
	int aCWmin, aCWmax;
732 733 734 735 736 737

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

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

738 739
	use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
		 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
740

741 742 743 744 745 746 747 748 749 750
	for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
		/* Set defaults according to 802.11-2007 Table 7-37 */
		aCWmax = 1023;
		if (use_11b)
			aCWmin = 31;
		else
			aCWmin = 15;

		switch (queue) {
		case 3: /* AC_BK */
751 752
			qparam.cw_max = aCWmax;
			qparam.cw_min = aCWmin;
753 754 755 756 757
			qparam.txop = 0;
			qparam.aifs = 7;
			break;
		default: /* never happens but let's not leave undefined */
		case 2: /* AC_BE */
758 759
			qparam.cw_max = aCWmax;
			qparam.cw_min = aCWmin;
760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781
			qparam.txop = 0;
			qparam.aifs = 3;
			break;
		case 1: /* AC_VI */
			qparam.cw_max = aCWmin;
			qparam.cw_min = (aCWmin + 1) / 2 - 1;
			if (use_11b)
				qparam.txop = 6016/32;
			else
				qparam.txop = 3008/32;
			qparam.aifs = 2;
			break;
		case 0: /* AC_VO */
			qparam.cw_max = (aCWmin + 1) / 2 - 1;
			qparam.cw_min = (aCWmin + 1) / 4 - 1;
			if (use_11b)
				qparam.txop = 3264/32;
			else
				qparam.txop = 1504/32;
			qparam.aifs = 2;
			break;
		}
782

783 784
		drv_conf_tx(local, queue, &qparam);
	}
785
}
786

787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807
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);
}

808
u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
809 810 811 812
			      enum ieee80211_band band)
{
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *bitrates;
813
	u32 mandatory_rates;
814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834
	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;
}
835 836 837

void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
			 u16 transaction, u16 auth_alg,
Johannes Berg's avatar
Johannes Berg committed
838 839
			 u8 *extra, size_t extra_len, const u8 *bssid,
			 const u8 *key, u8 key_len, u8 key_idx)
840 841 842 843
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
Johannes Berg's avatar
Johannes Berg committed
844
	int err;
845 846

	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
847
			    sizeof(*mgmt) + 6 + extra_len);
848 849
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
850
		       "frame\n", sdata->name);
851 852 853 854 855 856 857 858 859
		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);
	memcpy(mgmt->da, bssid, ETH_ALEN);
860
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
861 862 863 864 865 866 867
	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);

Johannes Berg's avatar
Johannes Berg committed
868 869 870 871 872 873
	if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
		mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
		err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
		WARN_ON(err);
	}

874 875
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
876 877
}

878
int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
879 880
			     const u8 *ie, size_t ie_len,
			     enum ieee80211_band band)
881 882
{
	struct ieee80211_supported_band *sband;
883 884 885
	u8 *pos;
	size_t offset = 0, noffset;
	int supp_rates_len, i;
886

887
	sband = local->hw.wiphy->bands[band];
888 889 890

	pos = buffer;

891 892
	supp_rates_len = min_t(int, sband->n_bitrates, 8);

893
	*pos++ = WLAN_EID_SUPP_RATES;
894
	*pos++ = supp_rates_len;
895

896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942
	for (i = 0; i < supp_rates_len; i++) {
		int rate = sband->bitrates[i].bitrate;
		*pos++ = (u8) (rate / 5);
	}

	/* insert "request information" if in custom IEs */
	if (ie && ie_len) {
		static const u8 before_extrates[] = {
			WLAN_EID_SSID,
			WLAN_EID_SUPP_RATES,
			WLAN_EID_REQUEST,
		};
		noffset = ieee80211_ie_split(ie, ie_len,
					     before_extrates,
					     ARRAY_SIZE(before_extrates),
					     offset);
		memcpy(pos, ie + offset, noffset - offset);
		pos += noffset - offset;
		offset = noffset;
	}

	if (sband->n_bitrates > i) {
		*pos++ = WLAN_EID_EXT_SUPP_RATES;
		*pos++ = sband->n_bitrates - i;

		for (; i < sband->n_bitrates; i++) {
			int rate = sband->bitrates[i].bitrate;
			*pos++ = (u8) (rate / 5);
		}
	}

	/* insert custom IEs that go before HT */
	if (ie && ie_len) {
		static const u8 before_ht[] = {
			WLAN_EID_SSID,
			WLAN_EID_SUPP_RATES,
			WLAN_EID_REQUEST,
			WLAN_EID_EXT_SUPP_RATES,
			WLAN_EID_DS_PARAMS,
			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
		};
		noffset = ieee80211_ie_split(ie, ie_len,
					     before_ht, ARRAY_SIZE(before_ht),
					     offset);
		memcpy(pos, ie + offset, noffset - offset);
		pos += noffset - offset;
		offset = noffset;
943 944
	}

945
	if (sband->ht_cap.ht_supported) {
946 947 948 949 950 951 952 953
		u16 cap = sband->ht_cap.cap;
		__le16 tmp;

		if (ieee80211_disable_40mhz_24ghz &&
		    sband->band == IEEE80211_BAND_2GHZ) {
			cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
			cap &= ~IEEE80211_HT_CAP_SGI_40;
		}
954 955 956 957

		*pos++ = WLAN_EID_HT_CAPABILITY;
		*pos++ = sizeof(struct ieee80211_ht_cap);
		memset(pos, 0, sizeof(struct ieee80211_ht_cap));
958
		tmp = cpu_to_le16(cap);
959 960 961
		memcpy(pos, &tmp, sizeof(u16));
		pos += sizeof(u16);
		*pos++ = sband->ht_cap.ampdu_factor |
962 963
			 (sband->ht_cap.ampdu_density <<
				IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
964 965 966 967 968
		memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
		pos += sizeof(sband->ht_cap.mcs);
		pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
	}

969 970 971 972 973
	/*
	 * If adding more here, adjust code in main.c
	 * that calculates local->scan_ies_len.
	 */

974 975 976 977 978
	/* add any remaining custom IEs */
	if (ie && ie_len) {
		noffset = ie_len;
		memcpy(pos, ie + offset, noffset - offset);
		pos += noffset - offset;
979 980 981 982 983
	}

	return pos - buffer;
}

984
void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
985 986
			      const u8 *ssid, size_t ssid_len,
			      const u8 *ie, size_t ie_len)
987 988 989 990
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
991
	u8 *pos;
992 993

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
994
			    ie_len);
995 996
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
997
		       "request\n", sdata->name);
998 999 1000 1001 1002 1003 1004 1005
		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);
1006
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017
	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);
1018
	pos += ssid_len;
1019

1020 1021
	skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len,
					      local->hw.conf.channel->band));
1022

1023 1024
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061
}

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;
}
1062

1063 1064 1065 1066 1067 1068 1069 1070 1071 1072
void ieee80211_stop_device(struct ieee80211_local *local)
{
	ieee80211_led_radio(local, false);

	cancel_work_sync(&local->reconfig_filter);
	drv_stop(local);

	flush_workqueue(local->workqueue);
}

1073 1074 1075 1076 1077 1078 1079
int ieee80211_reconfig(struct ieee80211_local *local)
{
	struct ieee80211_hw *hw = &local->hw;
	struct ieee80211_sub_if_data *sdata;
	struct sta_info *sta;
	unsigned long flags;
	int res;
1080

Johannes Berg's avatar
Johannes Berg committed
1081 1082
	if (local->suspended)
		local->resuming = true;
1083 1084 1085

	/* restart hardware */
	if (local->open_count) {
1086 1087 1088 1089 1090 1091
		/*
		 * Upon resume hardware can sometimes be goofy due to
		 * various platform / driver / bus issues, so restarting
		 * the device may at times not work immediately. Propagate
		 * the error.
		 */
1092
		res = drv_start(local);
1093 1094 1095
		if (res) {
			WARN(local->suspended, "Harware became unavailable "
			     "upon resume. This is could be a software issue"
1096
			     "prior to suspend or a hardware issue\n");