util.c 28.4 KB
Newer Older
Johannes Berg's avatar
Johannes Berg committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * utilities for mac80211
 */

#include <net/mac80211.h>
#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/wireless.h>
#include <linux/bitmap.h>
23
#include <linux/crc32.h>
24
#include <net/net_namespace.h>
Johannes Berg's avatar
Johannes Berg committed
25
#include <net/cfg80211.h>
26
#include <net/rtnetlink.h>
Johannes Berg's avatar
Johannes Berg committed
27 28

#include "ieee80211_i.h"
29
#include "driver-ops.h"
Johannes Berg's avatar
Johannes Berg committed
30
#include "rate.h"
31
#include "mesh.h"
Johannes Berg's avatar
Johannes Berg committed
32
#include "wme.h"
33
#include "led.h"
Johannes Berg's avatar
Johannes Berg committed
34
#include "wep.h"
Johannes Berg's avatar
Johannes Berg committed
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);
Johannes Berg's avatar
Johannes Berg committed
48

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

54 55
	 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
	if (len < 16)
Johannes Berg's avatar
Johannes Berg committed
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))
Johannes Berg's avatar
Johannes Berg committed
63
			return NULL;
64 65 66
		if (ieee80211_has_tods(fc))
			return hdr->addr1;
		if (ieee80211_has_fromds(fc))
Johannes Berg's avatar
Johannes Berg committed
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;
Johannes Berg's avatar
Johannes Berg committed
75
		return hdr->addr3;
76 77 78 79
	}

	if (ieee80211_is_ctl(fc)) {
		if(ieee80211_is_pspoll(fc))
Johannes Berg's avatar
Johannes Berg committed
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
			}
		}
Johannes Berg's avatar
Johannes Berg committed
93 94 95 96 97
	}

	return NULL;
}

98
void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
Johannes Berg's avatar
Johannes Berg committed
99
{
100 101 102 103 104 105 106
	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
107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122
}

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.
	 */

123
	if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
Johannes Berg's avatar
Johannes Berg committed
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,
165 166
					size_t frame_len,
					struct ieee80211_rate *rate)
Johannes Berg's avatar
Johannes Berg committed
167 168
{
	struct ieee80211_local *local = hw_to_local(hw);
169
	struct ieee80211_sub_if_data *sdata;
Johannes Berg's avatar
Johannes Berg committed
170 171
	u16 dur;
	int erp;
172
	bool short_preamble = false;
Johannes Berg's avatar
Johannes Berg committed
173

174
	erp = 0;
175 176
	if (vif) {
		sdata = vif_to_sdata(vif);
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(local, frame_len, rate->bitrate, erp,
183
				       short_preamble);
Johannes Berg's avatar
Johannes Berg committed
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)
Johannes Berg's avatar
Johannes Berg committed
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;
Johannes Berg's avatar
Johannes Berg committed
197 198
	int erp;
	u16 dur;
199 200 201
	struct ieee80211_supported_band *sband;

	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
Johannes Berg's avatar
Johannes Berg committed
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);
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;
	}
Johannes Berg's avatar
Johannes Berg committed
214 215

	/* CTS duration */
216
	dur = ieee80211_frame_duration(local, 10, rate->bitrate,
Johannes Berg's avatar
Johannes Berg committed
217 218
				       erp, short_preamble);
	/* Data frame duration */
219
	dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
Johannes Berg's avatar
Johannes Berg committed
220 221
					erp, short_preamble);
	/* ACK duration */
222
	dur += ieee80211_frame_duration(local, 10, rate->bitrate,
Johannes Berg's avatar
Johannes Berg committed
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,
Johannes Berg's avatar
Johannes Berg committed
231
				    size_t frame_len,
232
				    const struct ieee80211_tx_info *frame_txctl)
Johannes Berg's avatar
Johannes Berg committed
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;
Johannes Berg's avatar
Johannes Berg committed
238 239
	int erp;
	u16 dur;
240 241 242
	struct ieee80211_supported_band *sband;

	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
Johannes Berg's avatar
Johannes Berg committed
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);
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;
	}
Johannes Berg's avatar
Johannes Berg committed
254 255

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

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

268 269
static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
				   enum queue_stop_reason reason)
Johannes Berg's avatar
Johannes Berg committed
270 271 272
{
	struct ieee80211_local *local = hw_to_local(hw);

273 274
	if (WARN_ON(queue >= hw->queues))
		return;
275

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

278 279 280 281 282
	if (!skb_queue_empty(&local->pending[queue]) &&
	    local->queue_stop_reasons[queue] ==
				BIT(IEEE80211_QUEUE_STOP_REASON_PENDING))
		tasklet_schedule(&local->tx_pending_tasklet);

283 284 285 286
	if (local->queue_stop_reasons[queue] != 0)
		/* someone still has this queue stopped */
		return;

287
	netif_wake_subqueue(local->mdev, queue);
Johannes Berg's avatar
Johannes Berg committed
288
}
289

290 291
void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
				    enum queue_stop_reason reason)
292 293 294 295 296 297 298 299 300 301 302 303 304 305
{
	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
306 307
EXPORT_SYMBOL(ieee80211_wake_queue);

308 309
static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
				   enum queue_stop_reason reason)
Johannes Berg's avatar
Johannes Berg committed
310 311 312
{
	struct ieee80211_local *local = hw_to_local(hw);

313 314
	if (WARN_ON(queue >= hw->queues))
		return;
315

316 317 318 319 320 321 322
	/*
	 * Only stop if it was previously running, this is necessary
	 * for correct pending packets handling because there we may
	 * start (but not wake) the queue and rely on that.
	 */
	if (!local->queue_stop_reasons[queue])
		netif_stop_subqueue(local->mdev, queue);
323

324
	__set_bit(reason, &local->queue_stop_reasons[queue]);
Johannes Berg's avatar
Johannes Berg committed
325
}
326

327 328
void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
				    enum queue_stop_reason reason)
329 330 331 332 333 334 335 336 337 338 339 340 341 342
{
	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
343 344
EXPORT_SYMBOL(ieee80211_stop_queue);

345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390
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);

	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	__ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
	__ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_PENDING);
	skb_queue_tail(&local->pending[queue], skb);
	__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))) {
		ret++;
		queue = skb_get_queue_mapping(skb);
		skb_queue_tail(&local->pending[queue], skb);
	}

	for (i = 0; i < hw->queues; i++) {
		if (ret)
			__ieee80211_stop_queue(hw, i,
				IEEE80211_QUEUE_STOP_REASON_PENDING);
		__ieee80211_wake_queue(hw, i,
			IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
	}
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);

	return ret;
}

391 392
void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
				    enum queue_stop_reason reason)
Johannes Berg's avatar
Johannes Berg committed
393
{
394 395
	struct ieee80211_local *local = hw_to_local(hw);
	unsigned long flags;
Johannes Berg's avatar
Johannes Berg committed
396 397
	int i;

398 399
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);

400
	for (i = 0; i < hw->queues; i++)
401 402 403 404 405 406 407 408 409
		__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
410 411 412
}
EXPORT_SYMBOL(ieee80211_stop_queues);

413 414 415
int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
{
	struct ieee80211_local *local = hw_to_local(hw);
416

417 418
	if (WARN_ON(queue >= hw->queues))
		return true;
419

420 421 422 423
	return __netif_subqueue_stopped(local->mdev, queue);
}
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:
468 469 470 471 472 473 474
			break;
		}
		if (netif_running(sdata->dev))
			iterator(data, sdata->dev->dev_addr,
				 &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:
502 503 504 505
			break;
		}
		if (netif_running(sdata->dev))
			iterator(data, sdata->dev->dev_addr,
506
				 &sdata->vif);
507
	}
508 509

	rcu_read_unlock();
510
}
511
EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
512 513 514

void ieee802_11_parse_elems(u8 *start, size_t len,
			    struct ieee802_11_elems *elems)
515 516 517 518 519 520 521
{
	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)
522 523 524
{
	size_t left = len;
	u8 *pos = start;
525
	bool calc_crc = filter != 0;
526 527 528 529 530 531 532 533 534 535 536 537 538

	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)
539 540 541 542
			break;

		if (calc_crc && id < 64 && (filter & BIT(id)))
			crc = crc32_be(crc, pos - 2, elen + 2);
543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565

		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:
566 567 568 569
			if (elen >= sizeof(struct ieee80211_tim_ie)) {
				elems->tim = (void *)pos;
				elems->tim_len = elen;
			}
570 571 572 573 574 575 576 577 578
			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;
579
		case WLAN_EID_VENDOR_SPECIFIC:
580 581 582
			if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
			    pos[2] == 0xf2) {
				/* Microsoft OUI (00:50:F2) */
583 584 585 586

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

587 588 589 590 591
				if (pos[3] == 1) {
					/* OUI Type 1 - WPA IE */
					elems->wpa = pos;
					elems->wpa_len = elen;
				} else if (elen >= 5 && pos[3] == 2) {
592
					/* OUI Type 2 - WMM IE */
593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615
					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:
616 617
			if (elen >= sizeof(struct ieee80211_ht_cap))
				elems->ht_cap_elem = (void *)pos;
618
			break;
619 620
		case WLAN_EID_HT_INFORMATION:
			if (elen >= sizeof(struct ieee80211_ht_info))
621
				elems->ht_info_elem = (void *)pos;
622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665
			break;
		case WLAN_EID_MESH_ID:
			elems->mesh_id = pos;
			elems->mesh_id_len = elen;
			break;
		case WLAN_EID_MESH_CONFIG:
			elems->mesh_config = pos;
			elems->mesh_config_len = elen;
			break;
		case WLAN_EID_PEER_LINK:
			elems->peer_link = pos;
			elems->peer_link_len = elen;
			break;
		case WLAN_EID_PREQ:
			elems->preq = pos;
			elems->preq_len = elen;
			break;
		case WLAN_EID_PREP:
			elems->prep = pos;
			elems->prep_len = elen;
			break;
		case WLAN_EID_PERR:
			elems->perr = pos;
			elems->perr_len = elen;
			break;
		case WLAN_EID_CHANNEL_SWITCH:
			elems->ch_switch_elem = pos;
			elems->ch_switch_elem_len = elen;
			break;
		case WLAN_EID_QUIET:
			if (!elems->quiet_elem) {
				elems->quiet_elem = pos;
				elems->quiet_elem_len = elen;
			}
			elems->num_of_quiet_elem++;
			break;
		case WLAN_EID_COUNTRY:
			elems->country_elem = pos;
			elems->country_elem_len = elen;
			break;
		case WLAN_EID_PWR_CONSTRAINT:
			elems->pwr_constr_elem = pos;
			elems->pwr_constr_elem_len = elen;
			break;
666 667 668
		case WLAN_EID_TIMEOUT_INTERVAL:
			elems->timeout_int = pos;
			elems->timeout_int_len = elen;
669
			break;
670 671 672 673 674 675 676
		default:
			break;
		}

		left -= elen;
		pos += elen;
	}
677 678

	return crc;
679
}
680 681 682 683 684

void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_tx_queue_params qparam;
685 686 687
	int queue;
	bool use_11b;
	int aCWmin, aCWmax;
688 689 690 691 692 693

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

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

694 695
	use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
		 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
696

697 698 699 700 701 702 703 704 705 706
	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 */
707 708
			qparam.cw_max = aCWmax;
			qparam.cw_min = aCWmin;
709 710 711 712 713
			qparam.txop = 0;
			qparam.aifs = 7;
			break;
		default: /* never happens but let's not leave undefined */
		case 2: /* AC_BE */
714 715
			qparam.cw_max = aCWmax;
			qparam.cw_min = aCWmin;
716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737
			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;
		}
738

739 740
		drv_conf_tx(local, queue, &qparam);
	}
741
}
742

743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763
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);
}

764 765 766 767 768 769 770 771 772 773 774 775 776
void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
		      int encrypt)
{
	skb->dev = sdata->local->mdev;
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

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

	dev_queue_xmit(skb);
}
777

778
u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
779 780 781 782
			      enum ieee80211_band band)
{
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *bitrates;
783
	u32 mandatory_rates;
784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804
	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;
}
805 806 807

void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
			 u16 transaction, u16 auth_alg,
Johannes Berg's avatar
Johannes Berg committed
808 809
			 u8 *extra, size_t extra_len, const u8 *bssid,
			 const u8 *key, u8 key_len, u8 key_idx)
810 811 812 813
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
Johannes Berg's avatar
Johannes Berg committed
814
	int err;
815 816

	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
817
			    sizeof(*mgmt) + 6 + extra_len);
818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
		       "frame\n", sdata->dev->name);
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

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

Johannes Berg's avatar
Johannes Berg committed
838 839 840 841 842 843 844
	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);
	}

	ieee80211_tx_skb(sdata, skb, 0);
845 846
}

847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876
int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
			     const u8 *ie, size_t ie_len)
{
	struct ieee80211_supported_band *sband;
	u8 *pos, *supp_rates_len, *esupp_rates_len = NULL;
	int i;

	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

	pos = buffer;

	*pos++ = WLAN_EID_SUPP_RATES;
	supp_rates_len = pos;
	*pos++ = 0;

	for (i = 0; i < sband->n_bitrates; i++) {
		struct ieee80211_rate *rate = &sband->bitrates[i];

		if (esupp_rates_len) {
			*esupp_rates_len += 1;
		} else if (*supp_rates_len == 8) {
			*pos++ = WLAN_EID_EXT_SUPP_RATES;
			esupp_rates_len = pos;
			*pos++ = 1;
		} else
			*supp_rates_len += 1;

		*pos++ = rate->bitrate / 5;
	}

877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892
	if (sband->ht_cap.ht_supported) {
		__le16 tmp = cpu_to_le16(sband->ht_cap.cap);

		*pos++ = WLAN_EID_HT_CAPABILITY;
		*pos++ = sizeof(struct ieee80211_ht_cap);
		memset(pos, 0, sizeof(struct ieee80211_ht_cap));
		memcpy(pos, &tmp, sizeof(u16));
		pos += sizeof(u16);
		/* TODO: needs a define here for << 2 */
		*pos++ = sband->ht_cap.ampdu_factor |
			 (sband->ht_cap.ampdu_density << 2);
		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 */
	}

893 894 895 896 897 898 899 900 901 902 903 904 905
	/*
	 * If adding more here, adjust code in main.c
	 * that calculates local->scan_ies_len.
	 */

	if (ie) {
		memcpy(pos, ie, ie_len);
		pos += ie_len;
	}

	return pos - buffer;
}

906
void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
907 908
			      const u8 *ssid, size_t ssid_len,
			      const u8 *ie, size_t ie_len)
909 910 911 912
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
913
	u8 *pos;
914 915

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
916
			    ie_len);
917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
		       "request\n", sdata->dev->name);
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_PROBE_REQ);
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
	if (dst) {
		memcpy(mgmt->da, dst, ETH_ALEN);
		memcpy(mgmt->bssid, dst, ETH_ALEN);
	} else {
		memset(mgmt->da, 0xff, ETH_ALEN);
		memset(mgmt->bssid, 0xff, ETH_ALEN);
	}
	pos = skb_put(skb, 2 + ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = ssid_len;
	memcpy(pos, ssid, ssid_len);
940
	pos += ssid_len;
941

942
	skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len));
943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981

	ieee80211_tx_skb(sdata, skb, 0);
}

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

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

	bitrates = sband->bitrates;
	num_rates = sband->n_bitrates;
	supp_rates = 0;
	for (i = 0; i < elems->supp_rates_len +
		     elems->ext_supp_rates_len; i++) {
		u8 rate = 0;
		int own_rate;
		if (i < elems->supp_rates_len)
			rate = elems->supp_rates[i];
		else if (elems->ext_supp_rates)
			rate = elems->ext_supp_rates
				[i - elems->supp_rates_len];
		own_rate = 5 * (rate & 0x7f);
		for (j = 0; j < num_rates; j++)
			if (bitrates[j].bitrate == own_rate)
				supp_rates |= BIT(j);
	}
	return supp_rates;
}
982 983 984 985 986 987 988 989 990

int ieee80211_reconfig(struct ieee80211_local *local)
{
	struct ieee80211_hw *hw = &local->hw;
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_init_conf conf;
	struct sta_info *sta;
	unsigned long flags;
	int res;
991 992 993 994 995 996 997
	bool from_suspend = local->suspended;

	/*
	 * We're going to start the hardware, at that point
	 * we are no longer suspended and can RX frames.
	 */
	local->suspended = false;
998 999 1000

	/* restart hardware */
	if (local->open_count) {
1001
		res = drv_start(local);
1002

Johannes Berg's avatar
Johannes Berg committed
1003
		ieee80211_led_radio(local, true);
1004 1005 1006 1007 1008 1009 1010 1011 1012 1013
	}

	/* add interfaces */
	list_for_each_entry(sdata, &local->interfaces, list) {
		if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
		    sdata->vif.type != NL80211_IFTYPE_MONITOR &&
		    netif_running(sdata->dev)) {
			conf.vif = &sdata->vif;
			conf.type = sdata->vif.type;
			conf.mac_addr = sdata->dev->dev_addr;
1014
			res = drv_add_interface(local, &conf);
1015 1016 1017 1018 1019 1020 1021
		}
	}

	/* add STAs back */
	if (local->ops->sta_notify) {
		spin_lock_irqsave(&local->sta_lock, flags);
		list_for_each_entry(sta, &local->sta_list, list) {
1022
			sdata = sta->sdata;
1023 1024 1025 1026 1027
			if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
				sdata = container_of(sdata->bss,
					     struct ieee80211_sub_if_data,
					     u.ap);

1028 1029
			drv_sta_notify(local, &sdata->vif, STA_NOTIFY_ADD,
				       &sta->sta);
1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046
		}
		spin_unlock_irqrestore(&local->sta_lock, flags);
	}

	/* Clear Suspend state so that ADDBA requests can be processed */

	rcu_read_lock();

	if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
		list_for_each_entry_rcu(sta, &local->sta_list, list) {
			clear_sta_flags(sta, WLAN_STA_SUSPEND);
		}
	}

	rcu_read_unlock();

	/* setup RTS threshold */
1047
	drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063

	/* reconfigure hardware */
	ieee80211_hw_config(local, ~0);

	netif_addr_lock_bh(local->mdev);
	ieee80211_configure_filter(local);
	netif_addr_unlock_bh(local->mdev);

	/* Finally also reconfigure all the BSS information */
	list_for_each_entry(sdata, &local->interfaces, list) {
		u32 changed = ~0;
		if (!netif_running(sdata->dev))
			continue;
		switch (sdata->vif.type) {
		case NL80211_IFTYPE_STATION:
			/* disable beacon change bits */
1064 1065
			changed &= ~(BSS_CHANGED_BEACON |
				     BSS_CHANGED_BEACON_ENABLED);
1066 1067 1068 1069
			/* fall through */
		case NL80211_IFTYPE_ADHOC:
		case NL80211_IFTYPE_AP:
		case NL80211_IFTYPE_MESH_POINT:
1070
			ieee80211_bss_info_change_notify(sdata, changed);
1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092
			break;
		case NL80211_IFTYPE_WDS:
			break;
		case NL80211_IFTYPE_AP_VLAN:
		case NL80211_IFTYPE_MONITOR:
			/* ignore virtual */
			break;
		case NL80211_IFTYPE_UNSPECIFIED:
		case __NL80211_IFTYPE_AFTER_LAST:
			WARN_ON(1);
			break;
		}
	}

	/* add back keys */
	list_for_each_entry(sdata, &local->interfaces, list)
		if (netif_running(sdata->dev))
			ieee80211_enable_keys(sdata);

	ieee80211_wake_queues_by_reason(hw,
			IEEE80211_QUEUE_STOP_REASON_SUSPEND);

1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127
	/*
	 * If this is for hw restart things are still running.
	 * We may want to change that later, however.
	 */
	if (!from_suspend)
		return 0;

#ifdef CONFIG_PM
	local->suspended = false;

	list_for_each_entry(sdata, &local->interfaces, list) {
		switch(sdata->vif.type) {
		case NL80211_IFTYPE_STATION:
			ieee80211_sta_restart(sdata);
			break;
		case NL80211_IFTYPE_ADHOC:
			ieee80211_ibss_restart(sdata);
			break;
		case NL80211_IFTYPE_MESH_POINT:
			ieee80211_mesh_restart(sdata);
			break;
		default:
			break;
		}
	}

	add_timer(&local->sta_cleanup);

	spin_lock_irqsave(&local->sta_lock, flags);
	list_for_each_entry(sta, &local->sta_list, list)
		mesh_plink_restart(sta);
	spin_unlock_irqrestore(&local->sta_lock, flags);
#else
	WARN_ON(1);
#endif
1128 1129
	return 0;
}