util.c 55.6 KB
Newer Older
J
Johannes Berg 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
/*
 * 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>
16
#include <linux/export.h>
J
Johannes Berg 已提交
17 18 19 20 21 22
#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>
23
#include <linux/crc32.h>
24
#include <net/net_namespace.h>
J
Johannes Berg 已提交
25
#include <net/cfg80211.h>
26
#include <net/rtnetlink.h>
J
Johannes Berg 已提交
27 28

#include "ieee80211_i.h"
29
#include "driver-ops.h"
J
Johannes Berg 已提交
30
#include "rate.h"
31
#include "mesh.h"
J
Johannes Berg 已提交
32
#include "wme.h"
33
#include "led.h"
J
Johannes Berg 已提交
34
#include "wep.h"
J
Johannes Berg 已提交
35 36 37 38

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

39 40 41 42 43 44 45 46 47
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);
J
Johannes Berg 已提交
48

49
u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
50
			enum nl80211_iftype type)
J
Johannes Berg 已提交
51
{
52
	__le16 fc = hdr->frame_control;
J
Johannes Berg 已提交
53

54 55
	 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
	if (len < 16)
J
Johannes Berg 已提交
56 57
		return NULL;

58
	if (ieee80211_is_data(fc)) {
59 60
		if (len < 24) /* drop incorrect hdr len (data) */
			return NULL;
61 62

		if (ieee80211_has_a4(fc))
J
Johannes Berg 已提交
63
			return NULL;
64 65 66
		if (ieee80211_has_tods(fc))
			return hdr->addr1;
		if (ieee80211_has_fromds(fc))
J
Johannes Berg 已提交
67
			return hdr->addr2;
68 69 70 71 72

		return hdr->addr3;
	}

	if (ieee80211_is_mgmt(fc)) {
73 74
		if (len < 24) /* drop incorrect hdr len (mgmt) */
			return NULL;
J
Johannes Berg 已提交
75
		return hdr->addr3;
76 77 78 79
	}

	if (ieee80211_is_ctl(fc)) {
		if(ieee80211_is_pspoll(fc))
J
Johannes Berg 已提交
80
			return hdr->addr1;
81 82

		if (ieee80211_is_back_req(fc)) {
83
			switch (type) {
84
			case NL80211_IFTYPE_STATION:
85
				return hdr->addr2;
86 87
			case NL80211_IFTYPE_AP:
			case NL80211_IFTYPE_AP_VLAN:
88 89
				return hdr->addr1;
			default:
90
				break; /* fall through to the return */
91 92
			}
		}
J
Johannes Berg 已提交
93 94 95 96 97
	}

	return NULL;
}

98
void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
J
Johannes Berg 已提交
99
{
100
	struct sk_buff *skb;
J
Johannes Berg 已提交
101 102
	struct ieee80211_hdr *hdr;

103
	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
104 105
		hdr = (struct ieee80211_hdr *) skb->data;
		hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
106
	}
J
Johannes Berg 已提交
107 108
}

109
int ieee80211_frame_duration(enum ieee80211_band band, size_t len,
J
Johannes Berg 已提交
110 111 112 113 114 115 116 117 118 119 120 121 122
			     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.
	 */

123
	if (band == IEEE80211_BAND_5GHZ || erp) {
J
Johannes Berg 已提交
124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162
		/*
		 * 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 */
163 164
__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif,
165
					enum ieee80211_band band,
166 167
					size_t frame_len,
					struct ieee80211_rate *rate)
J
Johannes Berg 已提交
168
{
169
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
170 171
	u16 dur;
	int erp;
172
	bool short_preamble = false;
J
Johannes Berg 已提交
173

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

182
	dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
183
				       short_preamble);
J
Johannes Berg 已提交
184 185 186 187 188

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

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

201
	sband = local->hw.wiphy->bands[frame_txctl->band];
J
Johannes Berg 已提交
202

203
	short_preamble = false;
204

205
	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
206 207

	erp = 0;
208 209
	if (vif) {
		sdata = vif_to_sdata(vif);
J
Johannes Berg 已提交
210
		short_preamble = sdata->vif.bss_conf.use_short_preamble;
211 212 213
		if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
			erp = rate->flags & IEEE80211_RATE_ERP_G;
	}
J
Johannes Berg 已提交
214 215

	/* CTS duration */
216
	dur = ieee80211_frame_duration(sband->band, 10, rate->bitrate,
J
Johannes Berg 已提交
217 218
				       erp, short_preamble);
	/* Data frame duration */
219
	dur += ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
J
Johannes Berg 已提交
220 221
					erp, short_preamble);
	/* ACK duration */
222
	dur += ieee80211_frame_duration(sband->band, 10, rate->bitrate,
J
Johannes Berg 已提交
223 224 225 226 227 228
					erp, short_preamble);

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

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

242
	sband = local->hw.wiphy->bands[frame_txctl->band];
J
Johannes Berg 已提交
243

244
	short_preamble = false;
245

246
	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
247
	erp = 0;
248 249
	if (vif) {
		sdata = vif_to_sdata(vif);
J
Johannes Berg 已提交
250
		short_preamble = sdata->vif.bss_conf.use_short_preamble;
251 252 253
		if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
			erp = rate->flags & IEEE80211_RATE_ERP_G;
	}
J
Johannes Berg 已提交
254 255

	/* Data frame duration */
256
	dur = ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
J
Johannes Berg 已提交
257
				       erp, short_preamble);
258
	if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
J
Johannes Berg 已提交
259
		/* ACK duration */
260
		dur += ieee80211_frame_duration(sband->band, 10, rate->bitrate,
J
Johannes Berg 已提交
261 262 263 264 265 266 267
						erp, short_preamble);
	}

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

268 269 270
void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
{
	struct ieee80211_sub_if_data *sdata;
271 272 273 274
	int n_acs = IEEE80211_NUM_ACS;

	if (local->hw.queues < IEEE80211_NUM_ACS)
		n_acs = 1;
275 276 277 278

	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		int ac;

279 280 281
		if (!sdata->dev)
			continue;

282 283 284 285 286 287 288
		if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
			continue;

		if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
		    local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
			continue;

289
		for (ac = 0; ac < n_acs; ac++) {
290 291 292 293 294 295 296 297 298 299 300
			int ac_queue = sdata->vif.hw_queue[ac];

			if (ac_queue == queue ||
			    (sdata->vif.cab_queue == queue &&
			     local->queue_stop_reasons[ac_queue] == 0 &&
			     skb_queue_empty(&local->pending[ac_queue])))
				netif_wake_subqueue(sdata->dev, ac);
		}
	}
}

K
Kalle Valo 已提交
301 302
static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
				   enum queue_stop_reason reason)
J
Johannes Berg 已提交
303 304 305
{
	struct ieee80211_local *local = hw_to_local(hw);

J
Johannes Berg 已提交
306 307
	trace_wake_queue(local, queue, reason);

308 309
	if (WARN_ON(queue >= hw->queues))
		return;
K
Kalle Valo 已提交
310

311 312 313
	if (!test_bit(reason, &local->queue_stop_reasons[queue]))
		return;

314 315 316 317 318 319
	__clear_bit(reason, &local->queue_stop_reasons[queue]);

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

320 321
	if (skb_queue_empty(&local->pending[queue])) {
		rcu_read_lock();
322
		ieee80211_propagate_queue_wake(local, queue);
323 324
		rcu_read_unlock();
	} else
J
Johannes Berg 已提交
325
		tasklet_schedule(&local->tx_pending_tasklet);
J
Johannes Berg 已提交
326
}
K
Kalle Valo 已提交
327

328 329
void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
				    enum queue_stop_reason reason)
K
Kalle Valo 已提交
330 331 332 333 334 335 336 337 338 339 340 341 342 343
{
	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);
}
J
Johannes Berg 已提交
344 345
EXPORT_SYMBOL(ieee80211_wake_queue);

K
Kalle Valo 已提交
346 347
static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
				   enum queue_stop_reason reason)
J
Johannes Berg 已提交
348 349
{
	struct ieee80211_local *local = hw_to_local(hw);
350
	struct ieee80211_sub_if_data *sdata;
351
	int n_acs = IEEE80211_NUM_ACS;
J
Johannes Berg 已提交
352

J
Johannes Berg 已提交
353 354
	trace_stop_queue(local, queue, reason);

355 356
	if (WARN_ON(queue >= hw->queues))
		return;
357

358 359 360
	if (test_bit(reason, &local->queue_stop_reasons[queue]))
		return;

361
	__set_bit(reason, &local->queue_stop_reasons[queue]);
362

363 364 365
	if (local->hw.queues < IEEE80211_NUM_ACS)
		n_acs = 1;

366
	rcu_read_lock();
367 368 369
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		int ac;

370 371 372
		if (!sdata->dev)
			continue;

373
		for (ac = 0; ac < n_acs; ac++) {
374 375 376 377 378
			if (sdata->vif.hw_queue[ac] == queue ||
			    sdata->vif.cab_queue == queue)
				netif_stop_subqueue(sdata->dev, ac);
		}
	}
379
	rcu_read_unlock();
J
Johannes Berg 已提交
380
}
K
Kalle Valo 已提交
381

382 383
void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
				    enum queue_stop_reason reason)
K
Kalle Valo 已提交
384 385 386 387 388 389 390 391 392 393 394 395 396 397
{
	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);
}
J
Johannes Berg 已提交
398 399
EXPORT_SYMBOL(ieee80211_stop_queue);

400 401 402 403 404
void ieee80211_add_pending_skb(struct ieee80211_local *local,
			       struct sk_buff *skb)
{
	struct ieee80211_hw *hw = &local->hw;
	unsigned long flags;
405
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
406
	int queue = info->hw_queue;
407 408

	if (WARN_ON(!info->control.vif)) {
409
		ieee80211_free_txskb(&local->hw, skb);
410 411
		return;
	}
412 413 414

	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	__ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
J
Johannes Berg 已提交
415
	__skb_queue_tail(&local->pending[queue], skb);
416 417 418 419
	__ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
}

420 421 422
void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
				   struct sk_buff_head *skbs,
				   void (*fn)(void *data), void *data)
423 424 425 426
{
	struct ieee80211_hw *hw = &local->hw;
	struct sk_buff *skb;
	unsigned long flags;
427
	int queue, i;
428 429 430

	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	while ((skb = skb_dequeue(skbs))) {
431 432 433
		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

		if (WARN_ON(!info->control.vif)) {
434
			ieee80211_free_txskb(&local->hw, skb);
435 436 437
			continue;
		}

438
		queue = info->hw_queue;
439 440 441 442

		__ieee80211_stop_queue(hw, queue,
				IEEE80211_QUEUE_STOP_REASON_SKB_ADD);

J
Johannes Berg 已提交
443
		__skb_queue_tail(&local->pending[queue], skb);
444 445
	}

446 447 448
	if (fn)
		fn(data);

J
Johannes Berg 已提交
449
	for (i = 0; i < hw->queues; i++)
450 451 452 453 454
		__ieee80211_wake_queue(hw, i,
			IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
}

K
Kalle Valo 已提交
455
void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
456 457
				     unsigned long queues,
				     enum queue_stop_reason reason)
J
Johannes Berg 已提交
458
{
K
Kalle Valo 已提交
459 460
	struct ieee80211_local *local = hw_to_local(hw);
	unsigned long flags;
J
Johannes Berg 已提交
461 462
	int i;

K
Kalle Valo 已提交
463 464
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);

465
	for_each_set_bit(i, &queues, hw->queues)
K
Kalle Valo 已提交
466 467 468 469 470 471 472
		__ieee80211_stop_queue(hw, i, reason);

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

void ieee80211_stop_queues(struct ieee80211_hw *hw)
{
473
	ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
K
Kalle Valo 已提交
474
					IEEE80211_QUEUE_STOP_REASON_DRIVER);
J
Johannes Berg 已提交
475 476 477
}
EXPORT_SYMBOL(ieee80211_stop_queues);

478 479 480
int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
{
	struct ieee80211_local *local = hw_to_local(hw);
J
Johannes Berg 已提交
481 482
	unsigned long flags;
	int ret;
483

484 485
	if (WARN_ON(queue >= hw->queues))
		return true;
486

J
Johannes Berg 已提交
487
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
488 489
	ret = test_bit(IEEE80211_QUEUE_STOP_REASON_DRIVER,
		       &local->queue_stop_reasons[queue]);
J
Johannes Berg 已提交
490 491
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
	return ret;
492 493 494
}
EXPORT_SYMBOL(ieee80211_queue_stopped);

K
Kalle Valo 已提交
495
void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
496
				     unsigned long queues,
K
Kalle Valo 已提交
497
				     enum queue_stop_reason reason)
J
Johannes Berg 已提交
498
{
K
Kalle Valo 已提交
499 500
	struct ieee80211_local *local = hw_to_local(hw);
	unsigned long flags;
J
Johannes Berg 已提交
501 502
	int i;

K
Kalle Valo 已提交
503 504
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);

505
	for_each_set_bit(i, &queues, hw->queues)
K
Kalle Valo 已提交
506 507 508 509 510 511 512
		__ieee80211_wake_queue(hw, i, reason);

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

void ieee80211_wake_queues(struct ieee80211_hw *hw)
{
513 514
	ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
					IEEE80211_QUEUE_STOP_REASON_DRIVER);
J
Johannes Berg 已提交
515 516
}
EXPORT_SYMBOL(ieee80211_wake_queues);
517

518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539
void ieee80211_flush_queues(struct ieee80211_local *local,
			    struct ieee80211_sub_if_data *sdata)
{
	u32 queues;

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

	if (sdata && local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
		int ac;

		queues = 0;

		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
			queues |= BIT(sdata->vif.hw_queue[ac]);
		if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
			queues |= BIT(sdata->vif.cab_queue);
	} else {
		/* all queues */
		queues = BIT(local->hw.queues) - 1;
	}

540 541 542
	ieee80211_stop_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
					IEEE80211_QUEUE_STOP_REASON_FLUSH);

543
	drv_flush(local, queues, false);
544 545 546

	ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
					IEEE80211_QUEUE_STOP_REASON_FLUSH);
547 548
}

549
void ieee80211_iterate_active_interfaces(
550
	struct ieee80211_hw *hw, u32 iter_flags,
551 552 553
	void (*iterator)(void *data, u8 *mac,
			 struct ieee80211_vif *vif),
	void *data)
554 555 556 557
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_sub_if_data *sdata;

558
	mutex_lock(&local->iflist_mtx);
559 560 561

	list_for_each_entry(sdata, &local->interfaces, list) {
		switch (sdata->vif.type) {
562 563
		case NL80211_IFTYPE_MONITOR:
		case NL80211_IFTYPE_AP_VLAN:
564
			continue;
565
		default:
566 567
			break;
		}
568 569 570
		if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
		    !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
			continue;
571
		if (ieee80211_sdata_running(sdata))
572
			iterator(data, sdata->vif.addr,
573 574 575
				 &sdata->vif);
	}

576 577
	sdata = rcu_dereference_protected(local->monitor_sdata,
					  lockdep_is_held(&local->iflist_mtx));
578 579 580
	if (sdata &&
	    (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
	     sdata->flags & IEEE80211_SDATA_IN_DRIVER))
581 582
		iterator(data, sdata->vif.addr, &sdata->vif);

583
	mutex_unlock(&local->iflist_mtx);
584 585 586 587
}
EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);

void ieee80211_iterate_active_interfaces_atomic(
588
	struct ieee80211_hw *hw, u32 iter_flags,
589 590 591 592 593 594 595
	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;

596
	rcu_read_lock();
597

598
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
599
		switch (sdata->vif.type) {
600 601
		case NL80211_IFTYPE_MONITOR:
		case NL80211_IFTYPE_AP_VLAN:
602
			continue;
603
		default:
604 605
			break;
		}
606 607 608
		if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
		    !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
			continue;
609
		if (ieee80211_sdata_running(sdata))
610
			iterator(data, sdata->vif.addr,
611
				 &sdata->vif);
612
	}
613

614
	sdata = rcu_dereference(local->monitor_sdata);
615 616 617
	if (sdata &&
	    (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
	     sdata->flags & IEEE80211_SDATA_IN_DRIVER))
618 619
		iterator(data, sdata->vif.addr, &sdata->vif);

620
	rcu_read_unlock();
621
}
622
EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
623

624 625 626 627 628 629 630 631 632
/*
 * 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)
{
J
Johannes Berg 已提交
633 634 635
	if (WARN(local->suspended && !local->resuming,
		 "queueing ieee80211 work while going to suspend\n"))
		return false;
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

	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);

664 665 666 667 668 669 670
u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
			       struct ieee802_11_elems *elems,
			       u64 filter, u32 crc)
{
	size_t left = len;
	u8 *pos = start;
	bool calc_crc = filter != 0;
P
Paul Stewart 已提交
671
	DECLARE_BITMAP(seen_elems, 256);
672

P
Paul Stewart 已提交
673
	bitmap_zero(seen_elems, 256);
674 675 676 677 678 679
	memset(elems, 0, sizeof(*elems));
	elems->ie_start = start;
	elems->total_len = len;

	while (left >= 2) {
		u8 id, elen;
P
Paul Stewart 已提交
680
		bool elem_parse_failed;
681 682 683 684 685

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

P
Paul Stewart 已提交
686 687
		if (elen > left) {
			elems->parse_error = true;
688
			break;
P
Paul Stewart 已提交
689 690
		}

691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718
		switch (id) {
		case WLAN_EID_SSID:
		case WLAN_EID_SUPP_RATES:
		case WLAN_EID_FH_PARAMS:
		case WLAN_EID_DS_PARAMS:
		case WLAN_EID_CF_PARAMS:
		case WLAN_EID_TIM:
		case WLAN_EID_IBSS_PARAMS:
		case WLAN_EID_CHALLENGE:
		case WLAN_EID_RSN:
		case WLAN_EID_ERP_INFO:
		case WLAN_EID_EXT_SUPP_RATES:
		case WLAN_EID_HT_CAPABILITY:
		case WLAN_EID_HT_OPERATION:
		case WLAN_EID_VHT_CAPABILITY:
		case WLAN_EID_VHT_OPERATION:
		case WLAN_EID_MESH_ID:
		case WLAN_EID_MESH_CONFIG:
		case WLAN_EID_PEER_MGMT:
		case WLAN_EID_PREQ:
		case WLAN_EID_PREP:
		case WLAN_EID_PERR:
		case WLAN_EID_RANN:
		case WLAN_EID_CHANNEL_SWITCH:
		case WLAN_EID_EXT_CHANSWITCH_ANN:
		case WLAN_EID_COUNTRY:
		case WLAN_EID_PWR_CONSTRAINT:
		case WLAN_EID_TIMEOUT_INTERVAL:
719
		case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
720 721 722 723 724 725 726
			if (test_bit(id, seen_elems)) {
				elems->parse_error = true;
				left -= elen;
				pos += elen;
				continue;
			}
			break;
P
Paul Stewart 已提交
727
		}
728 729 730 731

		if (calc_crc && id < 64 && (filter & (1ULL << id)))
			crc = crc32_be(crc, pos - 2, elen + 2);

P
Paul Stewart 已提交
732 733
		elem_parse_failed = false;

734 735 736 737 738 739 740 741 742 743
		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_DS_PARAMS:
744 745 746 747
			if (elen >= 1)
				elems->ds_params = pos;
			else
				elem_parse_failed = true;
748 749 750 751 752
			break;
		case WLAN_EID_TIM:
			if (elen >= sizeof(struct ieee80211_tim_ie)) {
				elems->tim = (void *)pos;
				elems->tim_len = elen;
P
Paul Stewart 已提交
753 754
			} else
				elem_parse_failed = true;
755 756 757 758 759 760 761 762 763 764 765 766 767
			break;
		case WLAN_EID_CHALLENGE:
			elems->challenge = pos;
			elems->challenge_len = elen;
			break;
		case WLAN_EID_VENDOR_SPECIFIC:
			if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
			    pos[2] == 0xf2) {
				/* Microsoft OUI (00:50:F2) */

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

768
				if (elen >= 5 && pos[3] == 2) {
769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784
					/* OUI Type 2 - WMM IE */
					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:
785 786 787 788
			if (elen >= 1)
				elems->erp_info = pos;
			else
				elem_parse_failed = true;
789 790 791 792 793 794 795 796
			break;
		case WLAN_EID_EXT_SUPP_RATES:
			elems->ext_supp_rates = pos;
			elems->ext_supp_rates_len = elen;
			break;
		case WLAN_EID_HT_CAPABILITY:
			if (elen >= sizeof(struct ieee80211_ht_cap))
				elems->ht_cap_elem = (void *)pos;
P
Paul Stewart 已提交
797 798
			else
				elem_parse_failed = true;
799
			break;
800 801 802
		case WLAN_EID_HT_OPERATION:
			if (elen >= sizeof(struct ieee80211_ht_operation))
				elems->ht_operation = (void *)pos;
P
Paul Stewart 已提交
803 804
			else
				elem_parse_failed = true;
805
			break;
M
Mahesh Palivela 已提交
806 807 808 809 810 811 812 813 814 815 816 817
		case WLAN_EID_VHT_CAPABILITY:
			if (elen >= sizeof(struct ieee80211_vht_cap))
				elems->vht_cap_elem = (void *)pos;
			else
				elem_parse_failed = true;
			break;
		case WLAN_EID_VHT_OPERATION:
			if (elen >= sizeof(struct ieee80211_vht_operation))
				elems->vht_operation = (void *)pos;
			else
				elem_parse_failed = true;
			break;
818 819 820 821 822 823
		case WLAN_EID_OPMODE_NOTIF:
			if (elen > 0)
				elems->opmode_notif = pos;
			else
				elem_parse_failed = true;
			break;
824 825 826 827 828 829 830
		case WLAN_EID_MESH_ID:
			elems->mesh_id = pos;
			elems->mesh_id_len = elen;
			break;
		case WLAN_EID_MESH_CONFIG:
			if (elen >= sizeof(struct ieee80211_meshconf_ie))
				elems->mesh_config = (void *)pos;
P
Paul Stewart 已提交
831 832
			else
				elem_parse_failed = true;
833 834 835 836 837
			break;
		case WLAN_EID_PEER_MGMT:
			elems->peering = pos;
			elems->peering_len = elen;
			break;
M
Marco Porsch 已提交
838 839 840 841
		case WLAN_EID_MESH_AWAKE_WINDOW:
			if (elen >= 2)
				elems->awake_window = (void *)pos;
			break;
842 843 844 845 846 847 848 849 850 851 852 853 854 855 856
		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_RANN:
			if (elen >= sizeof(struct ieee80211_rann_ie))
				elems->rann = (void *)pos;
P
Paul Stewart 已提交
857 858
			else
				elem_parse_failed = true;
859 860
			break;
		case WLAN_EID_CHANNEL_SWITCH:
861 862 863 864 865
			if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
				elem_parse_failed = true;
				break;
			}
			elems->ch_switch_ie = (void *)pos;
866
			break;
867 868 869 870 871 872 873
		case WLAN_EID_EXT_CHANSWITCH_ANN:
			if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
				elem_parse_failed = true;
				break;
			}
			elems->ext_chansw_ie = (void *)pos;
			break;
874 875 876 877 878 879 880
		case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
			if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
				elem_parse_failed = true;
				break;
			}
			elems->sec_chan_offs = (void *)pos;
			break;
881 882 883 884 885
		case WLAN_EID_COUNTRY:
			elems->country_elem = pos;
			elems->country_elem_len = elen;
			break;
		case WLAN_EID_PWR_CONSTRAINT:
886 887 888 889
			if (elen != 1) {
				elem_parse_failed = true;
				break;
			}
890 891 892
			elems->pwr_constr_elem = pos;
			break;
		case WLAN_EID_TIMEOUT_INTERVAL:
893 894 895 896
			if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
				elems->timeout_int = (void *)pos;
			else
				elem_parse_failed = true;
897 898 899 900 901
			break;
		default:
			break;
		}

P
Paul Stewart 已提交
902 903 904
		if (elem_parse_failed)
			elems->parse_error = true;
		else
905
			__set_bit(id, seen_elems);
P
Paul Stewart 已提交
906

907 908 909 910
		left -= elen;
		pos += elen;
	}

P
Paul Stewart 已提交
911 912 913
	if (left != 0)
		elems->parse_error = true;

914 915 916
	return crc;
}

917 918
void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
			       bool bss_notify)
919 920 921
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_tx_queue_params qparam;
J
Johannes Berg 已提交
922
	struct ieee80211_chanctx_conf *chanctx_conf;
923
	int ac;
924
	bool use_11b, enable_qos;
925
	int aCWmin, aCWmax;
926 927 928 929

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

930 931 932
	if (local->hw.queues < IEEE80211_NUM_ACS)
		return;

933 934
	memset(&qparam, 0, sizeof(qparam));

J
Johannes Berg 已提交
935 936 937
	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	use_11b = (chanctx_conf &&
938
		   chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) &&
939
		 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
J
Johannes Berg 已提交
940
	rcu_read_unlock();
941

942 943 944 945 946 947 948
	/*
	 * By default disable QoS in STA mode for old access points, which do
	 * not support 802.11e. New APs will provide proper queue parameters,
	 * that we will configure later.
	 */
	enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);

949
	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
950 951 952 953 954 955 956
		/* Set defaults according to 802.11-2007 Table 7-37 */
		aCWmax = 1023;
		if (use_11b)
			aCWmin = 31;
		else
			aCWmin = 15;

957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993
		if (enable_qos) {
			switch (ac) {
			case IEEE80211_AC_BK:
				qparam.cw_max = aCWmax;
				qparam.cw_min = aCWmin;
				qparam.txop = 0;
				qparam.aifs = 7;
				break;
			/* never happens but let's not leave undefined */
			default:
			case IEEE80211_AC_BE:
				qparam.cw_max = aCWmax;
				qparam.cw_min = aCWmin;
				qparam.txop = 0;
				qparam.aifs = 3;
				break;
			case IEEE80211_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 IEEE80211_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;
			}
		} else {
			/* Confiure old 802.11b/g medium access rules. */
994 995
			qparam.cw_max = aCWmax;
			qparam.cw_min = aCWmin;
996 997 998
			qparam.txop = 0;
			qparam.aifs = 2;
		}
999

K
Kalle Valo 已提交
1000 1001
		qparam.uapsd = false;

1002 1003
		sdata->tx_conf[ac] = qparam;
		drv_conf_tx(local, sdata, ac, &qparam);
1004
	}
1005

1006 1007
	if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
	    sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
1008
		sdata->vif.bss_conf.qos = enable_qos;
1009 1010 1011
		if (bss_notify)
			ieee80211_bss_info_change_notify(sdata,
							 BSS_CHANGED_QOS);
1012
	}
1013
}
J
Johannes Berg 已提交
1014

1015 1016 1017 1018
void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
				  const size_t supp_rates_len,
				  const u8 *supp_rates)
{
J
Johannes Berg 已提交
1019
	struct ieee80211_chanctx_conf *chanctx_conf;
1020 1021 1022 1023 1024 1025 1026
	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;

J
Johannes Berg 已提交
1027 1028 1029 1030
	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);

	if (chanctx_conf &&
1031
	    chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ &&
1032 1033 1034 1035
	    have_higher_than_11mbit)
		sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
	else
		sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
J
Johannes Berg 已提交
1036
	rcu_read_unlock();
1037

1038
	ieee80211_set_wmm_default(sdata, true);
1039 1040
}

1041
u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
1042 1043 1044 1045
			      enum ieee80211_band band)
{
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *bitrates;
1046
	u32 mandatory_rates;
1047 1048 1049 1050
	enum ieee80211_rate_flags mandatory_flag;
	int i;

	sband = local->hw.wiphy->bands[band];
1051 1052
	if (WARN_ON(!sband))
		return 1;
1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065

	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;
}
1066 1067

void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1068
			 u16 transaction, u16 auth_alg, u16 status,
J
Johannes Berg 已提交
1069
			 const u8 *extra, size_t extra_len, const u8 *da,
1070 1071
			 const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
			 u32 tx_flags)
1072 1073 1074 1075
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
J
Johannes Berg 已提交
1076
	int err;
1077 1078

	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1079
			    sizeof(*mgmt) + 6 + extra_len);
1080
	if (!skb)
1081
		return;
1082

1083 1084 1085 1086 1087 1088
	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);
1089
	memcpy(mgmt->da, da, ETH_ALEN);
1090
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1091 1092 1093
	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);
1094
	mgmt->u.auth.status_code = cpu_to_le16(status);
1095 1096 1097
	if (extra)
		memcpy(skb_put(skb, extra_len), extra, extra_len);

J
Johannes Berg 已提交
1098 1099 1100 1101 1102 1103
	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);
	}

1104 1105
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
					tx_flags;
1106
	ieee80211_tx_skb(sdata, skb);
1107 1108
}

1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147
void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
				    const u8 *bssid, u16 stype, u16 reason,
				    bool send_frame, u8 *frame_buf)
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt = (void *)frame_buf;

	/* build frame */
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
	mgmt->duration = 0; /* initialize only */
	mgmt->seq_ctrl = 0; /* initialize only */
	memcpy(mgmt->da, bssid, ETH_ALEN);
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
	memcpy(mgmt->bssid, bssid, ETH_ALEN);
	/* u.deauth.reason_code == u.disassoc.reason_code */
	mgmt->u.deauth.reason_code = cpu_to_le16(reason);

	if (send_frame) {
		skb = dev_alloc_skb(local->hw.extra_tx_headroom +
				    IEEE80211_DEAUTH_FRAME_LEN);
		if (!skb)
			return;

		skb_reserve(skb, local->hw.extra_tx_headroom);

		/* copy in frame */
		memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
		       mgmt, IEEE80211_DEAUTH_FRAME_LEN);

		if (sdata->vif.type != NL80211_IFTYPE_STATION ||
		    !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
			IEEE80211_SKB_CB(skb)->flags |=
				IEEE80211_TX_INTFL_DONT_ENCRYPT;

		ieee80211_tx_skb(sdata, skb);
	}
}

1148
int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1149
			     size_t buffer_len, const u8 *ie, size_t ie_len,
1150 1151
			     enum ieee80211_band band, u32 rate_mask,
			     u8 channel)
1152 1153
{
	struct ieee80211_supported_band *sband;
1154
	u8 *pos = buffer, *end = buffer + buffer_len;
1155 1156
	size_t offset = 0, noffset;
	int supp_rates_len, i;
1157 1158 1159
	u8 rates[32];
	int num_rates;
	int ext_rates_len;
1160

1161
	sband = local->hw.wiphy->bands[band];
1162 1163
	if (WARN_ON_ONCE(!sband))
		return 0;
1164

1165 1166 1167 1168 1169 1170 1171 1172
	num_rates = 0;
	for (i = 0; i < sband->n_bitrates; i++) {
		if ((BIT(i) & rate_mask) == 0)
			continue; /* skip rate */
		rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
	}

	supp_rates_len = min_t(int, num_rates, 8);
1173

1174 1175
	if (end - pos < 2 + supp_rates_len)
		goto out_err;
1176
	*pos++ = WLAN_EID_SUPP_RATES;
1177
	*pos++ = supp_rates_len;
1178 1179
	memcpy(pos, rates, supp_rates_len);
	pos += supp_rates_len;
1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191

	/* 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);
1192 1193
		if (end - pos < noffset - offset)
			goto out_err;
1194 1195 1196 1197 1198
		memcpy(pos, ie + offset, noffset - offset);
		pos += noffset - offset;
		offset = noffset;
	}

1199 1200
	ext_rates_len = num_rates - supp_rates_len;
	if (ext_rates_len > 0) {
1201 1202
		if (end - pos < 2 + ext_rates_len)
			goto out_err;
1203
		*pos++ = WLAN_EID_EXT_SUPP_RATES;
1204 1205 1206
		*pos++ = ext_rates_len;
		memcpy(pos, rates + supp_rates_len, ext_rates_len);
		pos += ext_rates_len;
1207 1208
	}

1209
	if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1210 1211
		if (end - pos < 3)
			goto out_err;
1212 1213 1214 1215 1216
		*pos++ = WLAN_EID_DS_PARAMS;
		*pos++ = 1;
		*pos++ = channel;
	}

1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229
	/* 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);
1230 1231
		if (end - pos < noffset - offset)
			goto out_err;
1232 1233 1234
		memcpy(pos, ie + offset, noffset - offset);
		pos += noffset - offset;
		offset = noffset;
1235 1236
	}

1237 1238 1239
	if (sband->ht_cap.ht_supported) {
		if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
			goto out_err;
B
Ben Greear 已提交
1240 1241
		pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
						sband->ht_cap.cap);
1242
	}
1243

1244 1245 1246 1247 1248
	/*
	 * If adding more here, adjust code in main.c
	 * that calculates local->scan_ies_len.
	 */

1249 1250 1251
	/* add any remaining custom IEs */
	if (ie && ie_len) {
		noffset = ie_len;
1252 1253
		if (end - pos < noffset - offset)
			goto out_err;
1254 1255
		memcpy(pos, ie + offset, noffset - offset);
		pos += noffset - offset;
1256 1257
	}

1258 1259 1260
	if (sband->vht_cap.vht_supported) {
		if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
			goto out_err;
1261 1262
		pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
						 sband->vht_cap.cap);
1263
	}
1264

1265 1266 1267
	return pos - buffer;
 out_err:
	WARN_ONCE(1, "not enough space for preq IEs\n");
1268 1269 1270
	return pos - buffer;
}

1271
struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1272
					  u8 *dst, u32 ratemask,
1273
					  struct ieee80211_channel *chan,
1274
					  const u8 *ssid, size_t ssid_len,
1275 1276
					  const u8 *ie, size_t ie_len,
					  bool directed)
1277 1278 1279 1280
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
1281
	u8 chan_no;
1282
	int ies_len;
1283

1284 1285 1286 1287 1288 1289
	/*
	 * Do not send DS Channel parameter for directed probe requests
	 * in order to maximize the chance that we get a response.  Some
	 * badly-behaved APs don't respond when this parameter is included.
	 */
	if (directed)
1290
		chan_no = 0;
1291
	else
1292
		chan_no = ieee80211_frequency_to_channel(chan->center_freq);
1293

1294
	skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1295
				     ssid, ssid_len, 100 + ie_len);
1296
	if (!skb)
1297 1298 1299 1300 1301 1302 1303
		return NULL;

	ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
					   skb_tailroom(skb),
					   ie, ie_len, chan->band,
					   ratemask, chan_no);
	skb_put(skb, ies_len);
1304

1305
	if (dst) {
1306
		mgmt = (struct ieee80211_mgmt *) skb->data;
1307 1308 1309 1310
		memcpy(mgmt->da, dst, ETH_ALEN);
		memcpy(mgmt->bssid, dst, ETH_ALEN);
	}

1311
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1312

1313 1314 1315 1316 1317
	return skb;
}

void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
			      const u8 *ssid, size_t ssid_len,
1318
			      const u8 *ie, size_t ie_len,
1319
			      u32 ratemask, bool directed, u32 tx_flags,
J
Johannes Berg 已提交
1320
			      struct ieee80211_channel *channel, bool scan)
1321 1322 1323
{
	struct sk_buff *skb;

1324
	skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1325
					ssid, ssid_len,
1326
					ie, ie_len, directed);
1327
	if (skb) {
1328
		IEEE80211_SKB_CB(skb)->flags |= tx_flags;
J
Johannes Berg 已提交
1329 1330 1331 1332
		if (scan)
			ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
		else
			ieee80211_tx_skb(sdata, skb);
1333
	}
1334 1335 1336 1337
}

u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
			    struct ieee802_11_elems *elems,
1338
			    enum ieee80211_band band, u32 *basic_rates)
1339 1340 1341 1342 1343 1344 1345 1346
{
	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];

1347 1348
	if (WARN_ON(!sband))
		return 1;
1349 1350 1351 1352 1353 1354 1355 1356

	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;
1357
		bool is_basic;
1358 1359 1360 1361 1362 1363
		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);
1364 1365 1366 1367 1368 1369 1370
		is_basic = !!(rate & 0x80);

		if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
			continue;

		for (j = 0; j < num_rates; j++) {
			if (bitrates[j].bitrate == own_rate) {
1371
				supp_rates |= BIT(j);
1372 1373 1374 1375
				if (basic_rates && is_basic)
					*basic_rates |= BIT(j);
			}
		}
1376 1377 1378
	}
	return supp_rates;
}
1379

1380 1381 1382
void ieee80211_stop_device(struct ieee80211_local *local)
{
	ieee80211_led_radio(local, false);
1383
	ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1384 1385 1386 1387

	cancel_work_sync(&local->reconfig_filter);

	flush_workqueue(local->workqueue);
1388
	drv_stop(local);
1389 1390
}

1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409
static void ieee80211_assign_chanctx(struct ieee80211_local *local,
				     struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_chanctx_conf *conf;
	struct ieee80211_chanctx *ctx;

	if (!local->use_chanctx)
		return;

	mutex_lock(&local->chanctx_mtx);
	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
					 lockdep_is_held(&local->chanctx_mtx));
	if (conf) {
		ctx = container_of(conf, struct ieee80211_chanctx, conf);
		drv_assign_vif_chanctx(local, sdata, ctx);
	}
	mutex_unlock(&local->chanctx_mtx);
}

1410 1411 1412 1413
int ieee80211_reconfig(struct ieee80211_local *local)
{
	struct ieee80211_hw *hw = &local->hw;
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
1414
	struct ieee80211_chanctx *ctx;
1415
	struct sta_info *sta;
1416
	int res, i;
J
Johannes Berg 已提交
1417 1418
	bool reconfig_due_to_wowlan = false;

1419
#ifdef CONFIG_PM
J
Johannes Berg 已提交
1420 1421
	if (local->suspended)
		local->resuming = true;
1422

1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436
	if (local->wowlan) {
		local->wowlan = false;
		res = drv_resume(local);
		if (res < 0) {
			local->resuming = false;
			return res;
		}
		if (res == 0)
			goto wake_up;
		WARN_ON(res > 1);
		/*
		 * res is 1, which means the driver requested
		 * to go through a regular reset on wakeup.
		 */
J
Johannes Berg 已提交
1437
		reconfig_due_to_wowlan = true;
1438 1439
	}
#endif
1440 1441 1442
	/* everything else happens only if HW was up & running */
	if (!local->open_count)
		goto wake_up;
1443

1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455
	/*
	 * 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.
	 */
	res = drv_start(local);
	if (res) {
		WARN(local->suspended, "Hardware became unavailable "
		     "upon resume. This could be a software issue "
		     "prior to suspend or a hardware issue.\n");
		return res;
1456 1457
	}

1458 1459 1460 1461 1462 1463 1464 1465 1466
	/* setup fragmentation threshold */
	drv_set_frag_threshold(local, hw->wiphy->frag_threshold);

	/* setup RTS threshold */
	drv_set_rts_threshold(local, hw->wiphy->rts_threshold);

	/* reset coverage class */
	drv_set_coverage_class(local, hw->wiphy->coverage_class);

1467 1468 1469 1470
	ieee80211_led_radio(local, true);
	ieee80211_mod_tpt_led_trig(local,
				   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);

1471
	/* add interfaces */
1472 1473
	sdata = rtnl_dereference(local->monitor_sdata);
	if (sdata) {
1474 1475
		/* in HW restart it exists already */
		WARN_ON(local->resuming);
1476 1477 1478 1479 1480 1481 1482 1483
		res = drv_add_interface(local, sdata);
		if (WARN_ON(res)) {
			rcu_assign_pointer(local->monitor_sdata, NULL);
			synchronize_net();
			kfree(sdata);
		}
	}

1484 1485 1486
	list_for_each_entry(sdata, &local->interfaces, list) {
		if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
		    sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1487
		    ieee80211_sdata_running(sdata))
1488
			res = drv_add_interface(local, sdata);
1489 1490
	}

J
Johannes Berg 已提交
1491
	/* add channel contexts */
1492 1493 1494 1495 1496 1497
	if (local->use_chanctx) {
		mutex_lock(&local->chanctx_mtx);
		list_for_each_entry(ctx, &local->chanctx_list, list)
			WARN_ON(drv_add_chanctx(local, ctx));
		mutex_unlock(&local->chanctx_mtx);
	}
J
Johannes Berg 已提交
1498

1499 1500 1501
	list_for_each_entry(sdata, &local->interfaces, list) {
		if (!ieee80211_sdata_running(sdata))
			continue;
1502
		ieee80211_assign_chanctx(local, sdata);
1503 1504
	}

1505
	sdata = rtnl_dereference(local->monitor_sdata);
1506 1507
	if (sdata && ieee80211_sdata_running(sdata))
		ieee80211_assign_chanctx(local, sdata);
1508

1509
	/* add STAs back */
1510 1511
	mutex_lock(&local->sta_mtx);
	list_for_each_entry(sta, &local->sta_list, list) {
1512
		enum ieee80211_sta_state state;
J
Johannes Berg 已提交
1513

1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524
		if (!sta->uploaded)
			continue;

		/* AP-mode stations will be added later */
		if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
			continue;

		for (state = IEEE80211_STA_NOTEXIST;
		     state < sta->sta_state; state++)
			WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
					      state + 1));
1525
	}
1526
	mutex_unlock(&local->sta_mtx);
1527

1528
	/* reconfigure tx conf */
1529 1530 1531 1532 1533 1534
	if (hw->queues >= IEEE80211_NUM_ACS) {
		list_for_each_entry(sdata, &local->interfaces, list) {
			if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
			    sdata->vif.type == NL80211_IFTYPE_MONITOR ||
			    !ieee80211_sdata_running(sdata))
				continue;
1535

1536 1537 1538 1539
			for (i = 0; i < IEEE80211_NUM_ACS; i++)
				drv_conf_tx(local, sdata, i,
					    &sdata->tx_conf[i]);
		}
1540
	}
1541

1542 1543 1544 1545 1546 1547 1548
	/* reconfigure hardware */
	ieee80211_hw_config(local, ~0);

	ieee80211_configure_filter(local);

	/* Finally also reconfigure all the BSS information */
	list_for_each_entry(sdata, &local->interfaces, list) {
1549 1550
		u32 changed;

1551
		if (!ieee80211_sdata_running(sdata))
1552
			continue;
1553 1554 1555 1556 1557 1558 1559 1560 1561

		/* common change flags for all interface types */
		changed = BSS_CHANGED_ERP_CTS_PROT |
			  BSS_CHANGED_ERP_PREAMBLE |
			  BSS_CHANGED_ERP_SLOT |
			  BSS_CHANGED_HT |
			  BSS_CHANGED_BASIC_RATES |
			  BSS_CHANGED_BEACON_INT |
			  BSS_CHANGED_BSSID |
1562
			  BSS_CHANGED_CQM |
1563
			  BSS_CHANGED_QOS |
1564 1565
			  BSS_CHANGED_IDLE |
			  BSS_CHANGED_TXPOWER;
1566

1567 1568
		switch (sdata->vif.type) {
		case NL80211_IFTYPE_STATION:
1569
			changed |= BSS_CHANGED_ASSOC |
E
Eliad Peller 已提交
1570 1571
				   BSS_CHANGED_ARP_FILTER |
				   BSS_CHANGED_PS;
1572 1573 1574 1575

			if (sdata->u.mgd.dtim_period)
				changed |= BSS_CHANGED_DTIM_PERIOD;

1576
			mutex_lock(&sdata->u.mgd.mtx);
1577
			ieee80211_bss_info_change_notify(sdata, changed);
1578
			mutex_unlock(&sdata->u.mgd.mtx);
1579
			break;
1580
		case NL80211_IFTYPE_ADHOC:
1581 1582
			changed |= BSS_CHANGED_IBSS;
			/* fall through */
1583
		case NL80211_IFTYPE_AP:
1584
			changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1585

1586
			if (sdata->vif.type == NL80211_IFTYPE_AP) {
1587 1588
				changed |= BSS_CHANGED_AP_PROBE_RESP;

1589 1590 1591 1592
				if (rcu_access_pointer(sdata->u.ap.beacon))
					drv_start_ap(local, sdata);
			}

1593
			/* fall through */
1594
		case NL80211_IFTYPE_MESH_POINT:
1595 1596 1597 1598 1599
			if (sdata->vif.bss_conf.enable_beacon) {
				changed |= BSS_CHANGED_BEACON |
					   BSS_CHANGED_BEACON_ENABLED;
				ieee80211_bss_info_change_notify(sdata, changed);
			}
1600 1601 1602 1603 1604 1605 1606
			break;
		case NL80211_IFTYPE_WDS:
			break;
		case NL80211_IFTYPE_AP_VLAN:
		case NL80211_IFTYPE_MONITOR:
			/* ignore virtual */
			break;
1607
		case NL80211_IFTYPE_P2P_DEVICE:
1608 1609
			changed = BSS_CHANGED_IDLE;
			break;
1610
		case NL80211_IFTYPE_UNSPECIFIED:
1611
		case NUM_NL80211_IFTYPES:
1612 1613
		case NL80211_IFTYPE_P2P_CLIENT:
		case NL80211_IFTYPE_P2P_GO:
1614 1615 1616 1617 1618
			WARN_ON(1);
			break;
		}
	}

1619 1620
	ieee80211_recalc_ps(local, -1);

1621 1622 1623 1624 1625 1626 1627 1628 1629 1630
	/*
	 * The sta might be in psm against the ap (e.g. because
	 * this was the state before a hw restart), so we
	 * explicitly send a null packet in order to make sure
	 * it'll sync against the ap (and get out of psm).
	 */
	if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
		list_for_each_entry(sdata, &local->interfaces, list) {
			if (sdata->vif.type != NL80211_IFTYPE_STATION)
				continue;
1631 1632
			if (!sdata->u.mgd.associated)
				continue;
1633 1634 1635 1636 1637

			ieee80211_send_nullfunc(local, sdata, 0);
		}
	}

1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655
	/* APs are now beaconing, add back stations */
	mutex_lock(&local->sta_mtx);
	list_for_each_entry(sta, &local->sta_list, list) {
		enum ieee80211_sta_state state;

		if (!sta->uploaded)
			continue;

		if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
			continue;

		for (state = IEEE80211_STA_NOTEXIST;
		     state < sta->sta_state; state++)
			WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
					      state + 1));
	}
	mutex_unlock(&local->sta_mtx);

1656 1657 1658 1659 1660
	/* add back keys */
	list_for_each_entry(sdata, &local->interfaces, list)
		if (ieee80211_sdata_running(sdata))
			ieee80211_enable_keys(sdata);

1661
 wake_up:
1662 1663 1664
	local->in_reconfig = false;
	barrier();

1665 1666 1667
	if (local->monitors == local->open_count && local->monitors > 0)
		ieee80211_add_virtual_monitor(local);

1668 1669 1670 1671 1672 1673 1674 1675 1676 1677
	/*
	 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
	 * sessions can be established after a resume.
	 *
	 * Also tear down aggregation sessions since reconfiguring
	 * them in a hardware restart scenario is not easily done
	 * right now, and the hardware will have lost information
	 * about the sessions, but we and the AP still think they
	 * are active. This is really a workaround though.
	 */
1678
	if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1679 1680 1681
		mutex_lock(&local->sta_mtx);

		list_for_each_entry(sta, &local->sta_list, list) {
1682 1683
			ieee80211_sta_tear_down_BA_sessions(
					sta, AGG_STOP_LOCAL_REQUEST);
J
Johannes Berg 已提交
1684
			clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1685
		}
1686 1687

		mutex_unlock(&local->sta_mtx);
1688 1689
	}

1690 1691
	ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
					IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1692

1693 1694 1695 1696
	/*
	 * If this is for hw restart things are still running.
	 * We may want to change that later, however.
	 */
1697
	if (!local->suspended || reconfig_due_to_wowlan)
1698
		drv_restart_complete(local);
1699 1700

	if (!local->suspended)
1701 1702 1703
		return 0;

#ifdef CONFIG_PM
J
Johannes Berg 已提交
1704
	/* first set suspended false, then resuming */
1705
	local->suspended = false;
J
Johannes Berg 已提交
1706 1707
	mb();
	local->resuming = false;
1708

1709
	mod_timer(&local->sta_cleanup, jiffies + 1);
1710 1711 1712
#else
	WARN_ON(1);
#endif
1713 1714
	return 0;
}
1715

1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742
void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_local *local;
	struct ieee80211_key *key;

	if (WARN_ON(!vif))
		return;

	sdata = vif_to_sdata(vif);
	local = sdata->local;

	if (WARN_ON(!local->resuming))
		return;

	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
		return;

	sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;

	mutex_lock(&local->key_mtx);
	list_for_each_entry(key, &sdata->key_list, list)
		key->flags |= KEY_FLAG_TAINTED;
	mutex_unlock(&local->key_mtx);
}
EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);

1743
void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
1744
{
1745 1746 1747
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_chanctx *chanctx;
1748

1749
	mutex_lock(&local->chanctx_mtx);
1750

1751 1752
	chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
					lockdep_is_held(&local->chanctx_mtx));
1753

1754
	if (WARN_ON_ONCE(!chanctx_conf))
1755
		goto unlock;
1756

1757 1758
	chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
	ieee80211_recalc_smps_chanctx(local, chanctx);
1759
 unlock:
1760
	mutex_unlock(&local->chanctx_mtx);
1761
}
1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817

static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
{
	int i;

	for (i = 0; i < n_ids; i++)
		if (ids[i] == id)
			return true;
	return false;
}

/**
 * ieee80211_ie_split - split an IE buffer according to ordering
 *
 * @ies: the IE buffer
 * @ielen: the length of the IE buffer
 * @ids: an array with element IDs that are allowed before
 *	the split
 * @n_ids: the size of the element ID array
 * @offset: offset where to start splitting in the buffer
 *
 * This function splits an IE buffer by updating the @offset
 * variable to point to the location where the buffer should be
 * split.
 *
 * It assumes that the given IE buffer is well-formed, this
 * has to be guaranteed by the caller!
 *
 * It also assumes that the IEs in the buffer are ordered
 * correctly, if not the result of using this function will not
 * be ordered correctly either, i.e. it does no reordering.
 *
 * The function returns the offset where the next part of the
 * buffer starts, which may be @ielen if the entire (remainder)
 * of the buffer should be used.
 */
size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
			  const u8 *ids, int n_ids, size_t offset)
{
	size_t pos = offset;

	while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
		pos += 2 + ies[pos + 1];

	return pos;
}

size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
{
	size_t pos = offset;

	while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
		pos += 2 + ies[pos + 1];

	return pos;
}
1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857

static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
					    int rssi_min_thold,
					    int rssi_max_thold)
{
	trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);

	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
		return;

	/*
	 * Scale up threshold values before storing it, as the RSSI averaging
	 * algorithm uses a scaled up value as well. Change this scaling
	 * factor if the RSSI averaging algorithm changes.
	 */
	sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
	sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
}

void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
				    int rssi_min_thold,
				    int rssi_max_thold)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

	WARN_ON(rssi_min_thold == rssi_max_thold ||
		rssi_min_thold > rssi_max_thold);

	_ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
				       rssi_max_thold);
}
EXPORT_SYMBOL(ieee80211_enable_rssi_reports);

void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

	_ieee80211_enable_rssi_reports(sdata, 0, 0);
}
EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1858

B
Ben Greear 已提交
1859
u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873
			      u16 cap)
{
	__le16 tmp;

	*pos++ = WLAN_EID_HT_CAPABILITY;
	*pos++ = sizeof(struct ieee80211_ht_cap);
	memset(pos, 0, sizeof(struct ieee80211_ht_cap));

	/* capability flags */
	tmp = cpu_to_le16(cap);
	memcpy(pos, &tmp, sizeof(u16));
	pos += sizeof(u16);

	/* AMPDU parameters */
B
Ben Greear 已提交
1874 1875
	*pos++ = ht_cap->ampdu_factor |
		 (ht_cap->ampdu_density <<
1876 1877 1878
			IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);

	/* MCS set */
B
Ben Greear 已提交
1879 1880
	memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
	pos += sizeof(ht_cap->mcs);
1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893

	/* extended capabilities */
	pos += sizeof(__le16);

	/* BF capabilities */
	pos += sizeof(__le32);

	/* antenna selection */
	pos += sizeof(u8);

	return pos;
}

1894
u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1895
			       u32 cap)
1896 1897 1898 1899
{
	__le32 tmp;

	*pos++ = WLAN_EID_VHT_CAPABILITY;
M
Mahesh Palivela 已提交
1900 1901
	*pos++ = sizeof(struct ieee80211_vht_cap);
	memset(pos, 0, sizeof(struct ieee80211_vht_cap));
1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914

	/* capability flags */
	tmp = cpu_to_le32(cap);
	memcpy(pos, &tmp, sizeof(u32));
	pos += sizeof(u32);

	/* VHT MCS set */
	memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
	pos += sizeof(vht_cap->vht_mcs);

	return pos;
}

1915
u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1916
			       const struct cfg80211_chan_def *chandef,
1917
			       u16 prot_mode)
1918
{
1919
	struct ieee80211_ht_operation *ht_oper;
1920
	/* Build HT Information */
1921 1922 1923
	*pos++ = WLAN_EID_HT_OPERATION;
	*pos++ = sizeof(struct ieee80211_ht_operation);
	ht_oper = (struct ieee80211_ht_operation *)pos;
1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934
	ht_oper->primary_chan = ieee80211_frequency_to_channel(
					chandef->chan->center_freq);
	switch (chandef->width) {
	case NL80211_CHAN_WIDTH_160:
	case NL80211_CHAN_WIDTH_80P80:
	case NL80211_CHAN_WIDTH_80:
	case NL80211_CHAN_WIDTH_40:
		if (chandef->center_freq1 > chandef->chan->center_freq)
			ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
		else
			ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1935 1936
		break;
	default:
1937
		ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1938 1939
		break;
	}
1940
	if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1941 1942
	    chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
	    chandef->width != NL80211_CHAN_WIDTH_20)
1943
		ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1944

1945
	ht_oper->operation_mode = cpu_to_le16(prot_mode);
1946
	ht_oper->stbc_param = 0x0000;
1947 1948 1949

	/* It seems that Basic MCS set and Supported MCS set
	   are identical for the first 10 bytes */
1950 1951
	memset(&ht_oper->basic_set, 0, 16);
	memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1952

1953
	return pos + sizeof(struct ieee80211_ht_operation);
1954 1955
}

1956
void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan,
J
Johannes Berg 已提交
1957
				  const struct ieee80211_ht_operation *ht_oper,
1958
				  struct cfg80211_chan_def *chandef)
1959 1960 1961
{
	enum nl80211_channel_type channel_type;

1962 1963 1964 1965 1966
	if (!ht_oper) {
		cfg80211_chandef_create(chandef, control_chan,
					NL80211_CHAN_NO_HT);
		return;
	}
1967

1968
	switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981
	case IEEE80211_HT_PARAM_CHA_SEC_NONE:
		channel_type = NL80211_CHAN_HT20;
		break;
	case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
		channel_type = NL80211_CHAN_HT40PLUS;
		break;
	case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
		channel_type = NL80211_CHAN_HT40MINUS;
		break;
	default:
		channel_type = NL80211_CHAN_NO_HT;
	}

1982
	cfg80211_chandef_create(chandef, control_chan, channel_type);
1983 1984
}

1985
int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1986 1987
			    struct sk_buff *skb, bool need_basic,
			    enum ieee80211_band band)
1988 1989 1990 1991 1992
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	int rate;
	u8 i, rates, *pos;
1993
	u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1994

1995
	sband = local->hw.wiphy->bands[band];
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006
	rates = sband->n_bitrates;
	if (rates > 8)
		rates = 8;

	if (skb_tailroom(skb) < rates + 2)
		return -ENOMEM;

	pos = skb_put(skb, rates + 2);
	*pos++ = WLAN_EID_SUPP_RATES;
	*pos++ = rates;
	for (i = 0; i < rates; i++) {
2007 2008 2009
		u8 basic = 0;
		if (need_basic && basic_rates & BIT(i))
			basic = 0x80;
2010
		rate = sband->bitrates[i].bitrate;
2011
		*pos++ = basic | (u8) (rate / 5);
2012 2013 2014 2015 2016
	}

	return 0;
}

2017
int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2018 2019
				struct sk_buff *skb, bool need_basic,
				enum ieee80211_band band)
2020 2021 2022 2023 2024
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	int rate;
	u8 i, exrates, *pos;
2025
	u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2026

2027
	sband = local->hw.wiphy->bands[band];
2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041
	exrates = sband->n_bitrates;
	if (exrates > 8)
		exrates -= 8;
	else
		exrates = 0;

	if (skb_tailroom(skb) < exrates + 2)
		return -ENOMEM;

	if (exrates) {
		pos = skb_put(skb, exrates + 2);
		*pos++ = WLAN_EID_EXT_SUPP_RATES;
		*pos++ = exrates;
		for (i = 8; i < sband->n_bitrates; i++) {
2042 2043 2044
			u8 basic = 0;
			if (need_basic && basic_rates & BIT(i))
				basic = 0x80;
2045
			rate = sband->bitrates[i].bitrate;
2046
			*pos++ = basic | (u8) (rate / 5);
2047 2048 2049 2050
		}
	}
	return 0;
}
2051 2052 2053 2054 2055 2056

int ieee80211_ave_rssi(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

2057 2058 2059 2060
	if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
		/* non-managed type inferfaces */
		return 0;
	}
2061
	return ifmgd->ave_beacon_signal / 16;
2062
}
2063
EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079

u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
{
	if (!mcs)
		return 1;

	/* TODO: consider rx_highest */

	if (mcs->rx_mask[3])
		return 4;
	if (mcs->rx_mask[2])
		return 3;
	if (mcs->rx_mask[1])
		return 2;
	return 1;
}
2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113

/**
 * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
 * @local: mac80211 hw info struct
 * @status: RX status
 * @mpdu_len: total MPDU length (including FCS)
 * @mpdu_offset: offset into MPDU to calculate timestamp at
 *
 * This function calculates the RX timestamp at the given MPDU offset, taking
 * into account what the RX timestamp was. An offset of 0 will just normalize
 * the timestamp to TSF at beginning of MPDU reception.
 */
u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
				     struct ieee80211_rx_status *status,
				     unsigned int mpdu_len,
				     unsigned int mpdu_offset)
{
	u64 ts = status->mactime;
	struct rate_info ri;
	u16 rate;

	if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
		return 0;

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

	/* Fill cfg80211 rate info */
	if (status->flag & RX_FLAG_HT) {
		ri.mcs = status->rate_idx;
		ri.flags |= RATE_INFO_FLAGS_MCS;
		if (status->flag & RX_FLAG_40MHZ)
			ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
		if (status->flag & RX_FLAG_SHORT_GI)
			ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127
	} else if (status->flag & RX_FLAG_VHT) {
		ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
		ri.mcs = status->rate_idx;
		ri.nss = status->vht_nss;
		if (status->flag & RX_FLAG_40MHZ)
			ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
		if (status->flag & RX_FLAG_80MHZ)
			ri.flags |= RATE_INFO_FLAGS_80_MHZ_WIDTH;
		if (status->flag & RX_FLAG_80P80MHZ)
			ri.flags |= RATE_INFO_FLAGS_80P80_MHZ_WIDTH;
		if (status->flag & RX_FLAG_160MHZ)
			ri.flags |= RATE_INFO_FLAGS_160_MHZ_WIDTH;
		if (status->flag & RX_FLAG_SHORT_GI)
			ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144
	} else {
		struct ieee80211_supported_band *sband;

		sband = local->hw.wiphy->bands[status->band];
		ri.legacy = sband->bitrates[status->rate_idx].bitrate;
	}

	rate = cfg80211_calculate_bitrate(&ri);

	/* rewind from end of MPDU */
	if (status->flag & RX_FLAG_MACTIME_END)
		ts -= mpdu_len * 8 * 10 / rate;

	ts += mpdu_offset * 8 * 10 / rate;

	return ts;
}
2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175

void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
{
	struct ieee80211_sub_if_data *sdata;

	mutex_lock(&local->iflist_mtx);
	list_for_each_entry(sdata, &local->interfaces, list) {
		cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);

		if (sdata->wdev.cac_started) {
			ieee80211_vif_release_channel(sdata);
			cfg80211_cac_event(sdata->dev,
					   NL80211_RADAR_CAC_ABORTED,
					   GFP_KERNEL);
		}
	}
	mutex_unlock(&local->iflist_mtx);
}

void ieee80211_dfs_radar_detected_work(struct work_struct *work)
{
	struct ieee80211_local *local =
		container_of(work, struct ieee80211_local, radar_detected_work);
	struct cfg80211_chan_def chandef;

	ieee80211_dfs_cac_cancel(local);

	if (local->use_chanctx)
		/* currently not handled */
		WARN_ON(1);
	else {
2176
		chandef = local->hw.conf.chandef;
2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189
		cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
	}
}

void ieee80211_radar_detected(struct ieee80211_hw *hw)
{
	struct ieee80211_local *local = hw_to_local(hw);

	trace_api_radar_detected(local);

	ieee80211_queue_work(hw, &local->radar_detected_work);
}
EXPORT_SYMBOL(ieee80211_radar_detected);