tx.c 70.3 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
/*
 * 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.
 *
 *
 * Transmit and frame generation functions.
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/bitmap.h>
20
#include <linux/rcupdate.h>
21
#include <net/net_namespace.h>
22 23 24 25 26 27
#include <net/ieee80211_radiotap.h>
#include <net/cfg80211.h>
#include <net/mac80211.h>
#include <asm/unaligned.h>

#include "ieee80211_i.h"
28
#include "driver-ops.h"
J
Johannes Berg 已提交
29
#include "led.h"
30
#include "mesh.h"
31 32 33
#include "wep.h"
#include "wpa.h"
#include "wme.h"
J
Johannes Berg 已提交
34
#include "rate.h"
35 36 37

#define IEEE80211_TX_OK		0
#define IEEE80211_TX_AGAIN	1
J
Johannes Berg 已提交
38
#define IEEE80211_TX_PENDING	2
39 40 41

/* misc utils */

J
Johannes Berg 已提交
42 43
static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
				 int next_frag_len)
44 45
{
	int rate, mrate, erp, dur, i;
46
	struct ieee80211_rate *txrate;
47
	struct ieee80211_local *local = tx->local;
48
	struct ieee80211_supported_band *sband;
49
	struct ieee80211_hdr *hdr;
50 51 52 53 54 55 56 57 58
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);

	/* assume HW handles this */
	if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
		return 0;

	/* uh huh? */
	if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
		return 0;
59

60
	sband = local->hw.wiphy->bands[tx->channel->band];
61
	txrate = &sband->bitrates[info->control.rates[0].idx];
62

63
	erp = txrate->flags & IEEE80211_RATE_ERP_G;
64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81

	/*
	 * data and mgmt (except PS Poll):
	 * - during CFP: 32768
	 * - during contention period:
	 *   if addr1 is group address: 0
	 *   if more fragments = 0 and addr1 is individual address: time to
	 *      transmit one ACK plus SIFS
	 *   if more fragments = 1 and addr1 is individual address: time to
	 *      transmit next fragment plus 2 x ACK plus 3 x SIFS
	 *
	 * IEEE 802.11, 9.6:
	 * - control response frame (CTS or ACK) shall be transmitted using the
	 *   same rate as the immediately previous frame in the frame exchange
	 *   sequence, if this rate belongs to the PHY mandatory rates, or else
	 *   at the highest possible rate belonging to the PHY rates in the
	 *   BSSBasicRateSet
	 */
82 83
	hdr = (struct ieee80211_hdr *)tx->skb->data;
	if (ieee80211_is_ctl(hdr->frame_control)) {
84
		/* TODO: These control frames are not currently sent by
J
Johannes Berg 已提交
85
		 * mac80211, but should they be implemented, this function
86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102
		 * needs to be updated to support duration field calculation.
		 *
		 * RTS: time needed to transmit pending data/mgmt frame plus
		 *    one CTS frame plus one ACK frame plus 3 x SIFS
		 * CTS: duration of immediately previous RTS minus time
		 *    required to transmit CTS and its SIFS
		 * ACK: 0 if immediately previous directed data/mgmt had
		 *    more=0, with more=1 duration in ACK frame is duration
		 *    from previous frame minus time needed to transmit ACK
		 *    and its SIFS
		 * PS Poll: BIT(15) | BIT(14) | aid
		 */
		return 0;
	}

	/* data/mgmt */
	if (0 /* FIX: data/mgmt during CFP */)
J
Johannes Berg 已提交
103
		return cpu_to_le16(32768);
104 105 106 107 108 109 110 111 112 113 114 115 116 117 118

	if (group_addr) /* Group address as the destination - no ACK */
		return 0;

	/* Individual destination address:
	 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
	 * CTS and ACK frames shall be transmitted using the highest rate in
	 * basic rate set that is less than or equal to the rate of the
	 * immediately previous frame and that is using the same modulation
	 * (CCK or OFDM). If no basic rate set matches with these requirements,
	 * the highest mandatory rate of the PHY that is less than or equal to
	 * the rate of the previous frame is used.
	 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
	 */
	rate = -1;
119 120 121 122
	/* use lowest available if everything fails */
	mrate = sband->bitrates[0].bitrate;
	for (i = 0; i < sband->n_bitrates; i++) {
		struct ieee80211_rate *r = &sband->bitrates[i];
123

124 125
		if (r->bitrate > txrate->bitrate)
			break;
126

J
Johannes Berg 已提交
127
		if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148
			rate = r->bitrate;

		switch (sband->band) {
		case IEEE80211_BAND_2GHZ: {
			u32 flag;
			if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
				flag = IEEE80211_RATE_MANDATORY_G;
			else
				flag = IEEE80211_RATE_MANDATORY_B;
			if (r->flags & flag)
				mrate = r->bitrate;
			break;
		}
		case IEEE80211_BAND_5GHZ:
			if (r->flags & IEEE80211_RATE_MANDATORY_A)
				mrate = r->bitrate;
			break;
		case IEEE80211_NUM_BANDS:
			WARN_ON(1);
			break;
		}
149 150 151 152 153 154 155 156 157 158 159 160
	}
	if (rate == -1) {
		/* No matching basic rate found; use highest suitable mandatory
		 * PHY rate */
		rate = mrate;
	}

	/* Time needed to transmit ACK
	 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
	 * to closest integer */

	dur = ieee80211_frame_duration(local, 10, rate, erp,
J
Johannes Berg 已提交
161
				tx->sdata->vif.bss_conf.use_short_preamble);
162 163 164 165 166 167 168

	if (next_frag_len) {
		/* Frame is fragmented: duration increases with time needed to
		 * transmit next fragment plus ACK and 2 x SIFS. */
		dur *= 2; /* ACK + SIFS */
		/* next fragment */
		dur += ieee80211_frame_duration(local, next_frag_len,
169
				txrate->bitrate, erp,
J
Johannes Berg 已提交
170
				tx->sdata->vif.bss_conf.use_short_preamble);
171 172
	}

J
Johannes Berg 已提交
173
	return cpu_to_le16(dur);
174 175
}

176 177
static int inline is_ieee80211_device(struct ieee80211_local *local,
				      struct net_device *dev)
178
{
179
	return local == wdev_priv(dev->ieee80211_ptr);
180 181 182
}

/* tx handlers */
183 184 185 186
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
{
	struct ieee80211_local *local = tx->local;
187
	struct ieee80211_if_managed *ifmgd;
188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211

	/* driver doesn't support power save */
	if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
		return TX_CONTINUE;

	/* hardware does dynamic power save */
	if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
		return TX_CONTINUE;

	/* dynamic power save disabled */
	if (local->hw.conf.dynamic_ps_timeout <= 0)
		return TX_CONTINUE;

	/* we are scanning, don't enable power save */
	if (local->scanning)
		return TX_CONTINUE;

	if (!local->ps_sdata)
		return TX_CONTINUE;

	/* No point if we're going to suspend */
	if (local->quiescing)
		return TX_CONTINUE;

212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235
	/* dynamic ps is supported only in managed mode */
	if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
		return TX_CONTINUE;

	ifmgd = &tx->sdata->u.mgd;

	/*
	 * Don't wakeup from power save if u-apsd is enabled, voip ac has
	 * u-apsd enabled and the frame is in voip class. This effectively
	 * means that even if all access categories have u-apsd enabled, in
	 * practise u-apsd is only used with the voip ac. This is a
	 * workaround for the case when received voip class packets do not
	 * have correct qos tag for some reason, due the network or the
	 * peer application.
	 *
	 * Note: local->uapsd_queues access is racy here. If the value is
	 * changed via debugfs, user needs to reassociate manually to have
	 * everything in sync.
	 */
	if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
	    && (local->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
	    && skb_get_queue_mapping(tx->skb) == 0)
		return TX_CONTINUE;

236 237 238 239 240 241 242 243 244 245 246 247
	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
		ieee80211_stop_queues_by_reason(&local->hw,
						IEEE80211_QUEUE_STOP_REASON_PS);
		ieee80211_queue_work(&local->hw,
				     &local->dynamic_ps_disable_work);
	}

	mod_timer(&local->dynamic_ps_timer, jiffies +
		  msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));

	return TX_CONTINUE;
}
248

249
static ieee80211_tx_result debug_noinline
250
ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
251
{
252

253 254
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
255 256
	u32 sta_flags;

257
	if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
258
		return TX_CONTINUE;
259

260
	if (unlikely(test_bit(SCAN_OFF_CHANNEL, &tx->local->scanning)) &&
261 262 263 264 265 266 267 268 269 270 271 272 273
	    !ieee80211_is_probe_req(hdr->frame_control) &&
	    !ieee80211_is_nullfunc(hdr->frame_control))
		/*
		 * When software scanning only nullfunc frames (to notify
		 * the sleep state to the AP) and probe requests (for the
		 * active scan) are allowed, all other frames should not be
		 * sent and we should not get here, but if we do
		 * nonetheless, drop them to avoid sending them
		 * off-channel. See the link below and
		 * ieee80211_start_scan() for more.
		 *
		 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
		 */
274
		return TX_DROP;
275

B
Bill Jordan 已提交
276 277 278
	if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
		return TX_CONTINUE;

279
	if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
280 281
		return TX_CONTINUE;

282
	if (tx->flags & IEEE80211_TX_PS_BUFFERED)
283
		return TX_CONTINUE;
284

285
	sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
286

287
	if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
288
		if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
289
			     tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
290
			     ieee80211_is_data(hdr->frame_control))) {
291 292
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
			printk(KERN_DEBUG "%s: dropped data frame to not "
293
			       "associated station %pM\n",
294
			       tx->sdata->name, hdr->addr1);
295 296
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
			I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
297
			return TX_DROP;
298 299
		}
	} else {
300
		if (unlikely(ieee80211_is_data(hdr->frame_control) &&
301
			     tx->local->num_sta == 0 &&
302
			     tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
303 304 305 306
			/*
			 * No associated STAs - no need to send multicast
			 * frames.
			 */
307
			return TX_DROP;
308
		}
309
		return TX_CONTINUE;
310 311
	}

312
	return TX_CONTINUE;
313 314 315 316 317 318 319 320 321 322 323 324 325
}

/* This function is called whenever the AP is about to exceed the maximum limit
 * of buffered frames for power saving STAs. This situation should not really
 * happen often during normal operation, so dropping the oldest buffered packet
 * from each queue should be OK to make some room for new frames. */
static void purge_old_ps_buffers(struct ieee80211_local *local)
{
	int total = 0, purged = 0;
	struct sk_buff *skb;
	struct ieee80211_sub_if_data *sdata;
	struct sta_info *sta;

326 327 328 329 330 331
	/*
	 * virtual interfaces are protected by RCU
	 */
	rcu_read_lock();

	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
332
		struct ieee80211_if_ap *ap;
333
		if (sdata->vif.type != NL80211_IFTYPE_AP)
334 335 336 337 338 339 340 341 342 343
			continue;
		ap = &sdata->u.ap;
		skb = skb_dequeue(&ap->ps_bc_buf);
		if (skb) {
			purged++;
			dev_kfree_skb(skb);
		}
		total += skb_queue_len(&ap->ps_bc_buf);
	}

344
	list_for_each_entry_rcu(sta, &local->sta_list, list) {
345 346 347 348 349 350 351
		skb = skb_dequeue(&sta->ps_tx_buf);
		if (skb) {
			purged++;
			dev_kfree_skb(skb);
		}
		total += skb_queue_len(&sta->ps_tx_buf);
	}
352 353

	rcu_read_unlock();
354 355

	local->total_ps_buffered = total;
356
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
J
Joe Perches 已提交
357 358
	wiphy_debug(local->hw.wiphy, "PS buffers full - purged %d frames\n",
		    purged);
359
#endif
360 361
}

362
static ieee80211_tx_result
363
ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
364
{
365
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
366
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
367

368 369 370 371 372 373 374 375
	/*
	 * broadcast/multicast frame
	 *
	 * If any of the associated stations is in power save mode,
	 * the frame is buffered to be sent after DTIM beacon frame.
	 * This is done either by the hardware or us.
	 */

376 377 378 379 380
	/* powersaving STAs only in AP/VLAN mode */
	if (!tx->sdata->bss)
		return TX_CONTINUE;

	/* no buffering for ordered frames */
381
	if (ieee80211_has_order(hdr->frame_control))
382
		return TX_CONTINUE;
383 384 385

	/* no stations in PS mode */
	if (!atomic_read(&tx->sdata->bss->num_sta_ps))
386
		return TX_CONTINUE;
387

388
	info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
J
Johannes Berg 已提交
389

390 391
	/* device releases frame after DTIM beacon */
	if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
J
Johannes Berg 已提交
392 393
		return TX_CONTINUE;

394
	/* buffered in mac80211 */
J
Johannes Berg 已提交
395 396 397 398
	if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
		purge_old_ps_buffers(tx->local);

	if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) {
399
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
J
Johannes Berg 已提交
400 401
		if (net_ratelimit())
			printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n",
402
			       tx->sdata->name);
403
#endif
J
Johannes Berg 已提交
404 405 406
		dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
	} else
		tx->local->total_ps_buffered++;
407

J
Johannes Berg 已提交
408
	skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
409

J
Johannes Berg 已提交
410
	return TX_QUEUED;
411 412
}

413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428
static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
			     struct sk_buff *skb)
{
	if (!ieee80211_is_mgmt(fc))
		return 0;

	if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP))
		return 0;

	if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
					    skb->data))
		return 0;

	return 1;
}

429
static ieee80211_tx_result
430
ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
431 432
{
	struct sta_info *sta = tx->sta;
433
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
434
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
435
	struct ieee80211_local *local = tx->local;
436
	u32 staflags;
437

438 439 440 441 442
	if (unlikely(!sta ||
		     ieee80211_is_probe_resp(hdr->frame_control) ||
		     ieee80211_is_auth(hdr->frame_control) ||
		     ieee80211_is_assoc_resp(hdr->frame_control) ||
		     ieee80211_is_reassoc_resp(hdr->frame_control)))
443
		return TX_CONTINUE;
444

445 446
	staflags = get_sta_flags(sta);

447
	if (unlikely((staflags & (WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) &&
448
		     !(info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE))) {
449
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
450
		printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries "
451
		       "before %d)\n",
452
		       sta->sta.addr, sta->sta.aid,
453 454 455 456 457 458
		       skb_queue_len(&sta->ps_tx_buf));
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
		if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
			purge_old_ps_buffers(tx->local);
		if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
			struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
459
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
460
			if (net_ratelimit()) {
461
				printk(KERN_DEBUG "%s: STA %pM TX "
462
				       "buffer full - dropping oldest frame\n",
463
				       tx->sdata->name, sta->sta.addr);
464
			}
465
#endif
466 467 468
			dev_kfree_skb(old);
		} else
			tx->local->total_ps_buffered++;
469

470 471 472 473 474 475 476
		/*
		 * Queue frame to be sent after STA wakes up/polls,
		 * but don't set the TIM bit if the driver is blocking
		 * wakeup or poll response transmissions anyway.
		 */
		if (skb_queue_empty(&sta->ps_tx_buf) &&
		    !(staflags & WLAN_STA_PS_DRIVER))
477 478
			sta_info_set_tim_bit(sta);

479
		info->control.jiffies = jiffies;
480
		info->control.vif = &tx->sdata->vif;
481
		info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
482
		skb_queue_tail(&sta->ps_tx_buf, tx->skb);
483 484 485 486 487 488

		if (!timer_pending(&local->sta_cleanup))
			mod_timer(&local->sta_cleanup,
				  round_jiffies(jiffies +
						STA_INFO_CLEANUP_INTERVAL));

489
		return TX_QUEUED;
490 491
	}
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
492
	else if (unlikely(staflags & WLAN_STA_PS_STA)) {
493
		printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll "
494
		       "set -> send frame\n", tx->sdata->name,
495
		       sta->sta.addr);
496 497 498
	}
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */

499
	return TX_CONTINUE;
500 501
}

502
static ieee80211_tx_result debug_noinline
503
ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
504
{
505
	if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
506
		return TX_CONTINUE;
507

508
	if (tx->flags & IEEE80211_TX_UNICAST)
509 510 511 512 513
		return ieee80211_tx_h_unicast_ps_buf(tx);
	else
		return ieee80211_tx_h_multicast_ps_buf(tx);
}

514 515 516 517 518 519 520 521 522 523 524 525
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);

	if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
		     tx->sdata->control_port_no_encrypt))
		info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;

	return TX_CONTINUE;
}

526
static ieee80211_tx_result debug_noinline
527
ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
528
{
529
	struct ieee80211_key *key = NULL;
530
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
531
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
532

J
Johannes Berg 已提交
533
	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
534
		tx->key = NULL;
535
	else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
536
		tx->key = key;
537
	else if (ieee80211_is_mgmt(hdr->frame_control) &&
538 539
		 is_multicast_ether_addr(hdr->addr1) &&
		 ieee80211_is_robust_mgmt_frame(hdr) &&
540 541
		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
		tx->key = key;
542 543
	else if ((key = rcu_dereference(tx->sdata->default_key)))
		tx->key = key;
544
	else if (tx->sdata->drop_unencrypted &&
545
		 (tx->skb->protocol != tx->sdata->control_port_protocol) &&
546 547 548 549
		 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
		 (!ieee80211_is_robust_mgmt_frame(hdr) ||
		  (ieee80211_is_action(hdr->frame_control) &&
		   tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) {
550
		I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
551
		return TX_DROP;
552
	} else
553 554 555
		tx->key = NULL;

	if (tx->key) {
556 557
		bool skip_hw = false;

558
		tx->key->tx_rx_count++;
559
		/* TODO: add threshold stuff again */
560

561 562 563
		switch (tx->key->conf.cipher) {
		case WLAN_CIPHER_SUITE_WEP40:
		case WLAN_CIPHER_SUITE_WEP104:
564
			if (ieee80211_is_auth(hdr->frame_control))
565
				break;
566
		case WLAN_CIPHER_SUITE_TKIP:
567
			if (!ieee80211_is_data_present(hdr->frame_control))
568 569
				tx->key = NULL;
			break;
570
		case WLAN_CIPHER_SUITE_CCMP:
571 572 573 574
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
575 576 577 578
			else
				skip_hw = (tx->key->conf.flags &
					   IEEE80211_KEY_FLAG_SW_MGMT) &&
					ieee80211_is_mgmt(hdr->frame_control);
579
			break;
580
		case WLAN_CIPHER_SUITE_AES_CMAC:
581 582 583
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
584
		}
585

J
Johannes Berg 已提交
586
		if (!skip_hw && tx->key &&
J
Johannes Berg 已提交
587
		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
588
			info->control.hw_key = &tx->key->conf;
589 590
	}

591
	return TX_CONTINUE;
592 593
}

594
static ieee80211_tx_result debug_noinline
595
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
596
{
597
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
598 599 600
	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *rate;
S
Shanyu Zhao 已提交
601 602
	int i;
	u32 len;
603 604
	bool inval = false, rts = false, short_preamble = false;
	struct ieee80211_tx_rate_control txrc;
605
	u32 sta_flags;
606

607
	memset(&txrc, 0, sizeof(txrc));
608

609
	sband = tx->local->hw.wiphy->bands[tx->channel->band];
610

S
Shanyu Zhao 已提交
611
	len = min_t(u32, tx->skb->len + FCS_LEN,
612
			 tx->local->hw.wiphy->frag_threshold);
613 614 615 616 617 618 619

	/* set up the tx rate control struct we give the RC algo */
	txrc.hw = local_to_hw(tx->local);
	txrc.sband = sband;
	txrc.bss_conf = &tx->sdata->vif.bss_conf;
	txrc.skb = tx->skb;
	txrc.reported_rate.idx = -1;
620 621 622 623 624
	txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band];
	if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
		txrc.max_rate_idx = -1;
	else
		txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
625 626
	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
627 628

	/* set up RTS protection if desired */
629
	if (len > tx->local->hw.wiphy->rts_threshold) {
630
		txrc.rts = rts = true;
631 632
	}

633 634 635 636 637 638 639 640 641 642
	/*
	 * Use short preamble if the BSS can handle it, but not for
	 * management frames unless we know the receiver can handle
	 * that -- the management frame might be to a station that
	 * just wants a probe response.
	 */
	if (tx->sdata->vif.bss_conf.use_short_preamble &&
	    (ieee80211_is_data(hdr->frame_control) ||
	     (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
		txrc.short_preamble = short_preamble = true;
643

644 645 646 647 648 649
	sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;

	/*
	 * Lets not bother rate control if we're associated and cannot
	 * talk to the sta. This should not happen.
	 */
650
	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) &&
651 652 653 654 655
		 (sta_flags & WLAN_STA_ASSOC) &&
		 !rate_usable_index_exists(sband, &tx->sta->sta),
		 "%s: Dropped data frame as no usable bitrate found while "
		 "scanning and associated. Target station: "
		 "%pM on %d GHz band\n",
656
		 tx->sdata->name, hdr->addr1,
657 658
		 tx->channel->band ? 5 : 2))
		return TX_DROP;
659

660 661 662 663
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
664 665 666 667 668 669 670
	rate_control_get_rate(tx->sdata, tx->sta, &txrc);

	if (unlikely(info->control.rates[0].idx < 0))
		return TX_DROP;

	if (txrc.reported_rate.idx < 0)
		txrc.reported_rate = info->control.rates[0];
671

672
	if (tx->sta)
673
		tx->sta->last_tx_rate = txrc.reported_rate;
674

675 676
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
677

678 679 680 681
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

682 683 684 685 686
	if (is_multicast_ether_addr(hdr->addr1)) {
		/*
		 * XXX: verify the rate is in the basic rateset
		 */
		return TX_CONTINUE;
687 688
	}

689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713
	/*
	 * set up the RTS/CTS rate as the fastest basic rate
	 * that is not faster than the data rate
	 *
	 * XXX: Should this check all retry rates?
	 */
	if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
		s8 baserate = 0;

		rate = &sband->bitrates[info->control.rates[0].idx];

		for (i = 0; i < sband->n_bitrates; i++) {
			/* must be a basic rate */
			if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
				continue;
			/* must not be faster than the data rate */
			if (sband->bitrates[i].bitrate > rate->bitrate)
				continue;
			/* maximum */
			if (sband->bitrates[baserate].bitrate <
			     sband->bitrates[i].bitrate)
				baserate = i;
		}

		info->control.rts_cts_rate_idx = baserate;
714 715
	}

716 717 718 719 720 721 722 723 724 725 726 727 728 729
	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
		/*
		 * make sure there's no valid rate following
		 * an invalid one, just in case drivers don't
		 * take the API seriously to stop at -1.
		 */
		if (inval) {
			info->control.rates[i].idx = -1;
			continue;
		}
		if (info->control.rates[i].idx < 0) {
			inval = true;
			continue;
		}
730

731 732 733 734 735 736 737 738
		/*
		 * For now assume MCS is already set up correctly, this
		 * needs to be fixed.
		 */
		if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
			WARN_ON(info->control.rates[i].idx > 76);
			continue;
		}
739

740 741 742 743
		/* set up RTS protection if desired */
		if (rts)
			info->control.rates[i].flags |=
				IEEE80211_TX_RC_USE_RTS_CTS;
744

745
		/* RC is busted */
S
Sujith 已提交
746 747
		if (WARN_ON_ONCE(info->control.rates[i].idx >=
				 sband->n_bitrates)) {
748 749
			info->control.rates[i].idx = -1;
			continue;
750
		}
751

752 753 754 755 756 757 758 759 760 761 762 763 764
		rate = &sband->bitrates[info->control.rates[i].idx];

		/* set up short preamble */
		if (short_preamble &&
		    rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
			info->control.rates[i].flags |=
				IEEE80211_TX_RC_USE_SHORT_PREAMBLE;

		/* set up G protection */
		if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
		    rate->flags & IEEE80211_RATE_ERP_G)
			info->control.rates[i].flags |=
				IEEE80211_TX_RC_USE_CTS_PROTECT;
765 766
	}

767 768 769
	return TX_CONTINUE;
}

770 771 772 773 774 775 776 777 778
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
	u16 *seq;
	u8 *qc;
	int tid;

779 780 781 782 783
	/*
	 * Packet injection may want to control the sequence
	 * number, if we have no matching interface then we
	 * neither assign one ourselves nor ask the driver to.
	 */
784
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
785 786
		return TX_CONTINUE;

787 788 789 790 791 792
	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
		return TX_CONTINUE;

	if (ieee80211_hdrlen(hdr->frame_control) < 24)
		return TX_CONTINUE;

J
Johannes Berg 已提交
793 794 795 796 797
	/*
	 * Anything but QoS data that has a sequence number field
	 * (is long enough) gets a sequence number from the global
	 * counter.
	 */
798
	if (!ieee80211_is_data_qos(hdr->frame_control)) {
J
Johannes Berg 已提交
799
		/* driver should assign sequence number */
800
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
J
Johannes Berg 已提交
801 802 803
		/* for pure STA mode without beacons, we can do it */
		hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
		tx->sdata->sequence_number += 0x10;
804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828
		return TX_CONTINUE;
	}

	/*
	 * This should be true for injected/management frames only, for
	 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
	 * above since they are not QoS-data frames.
	 */
	if (!tx->sta)
		return TX_CONTINUE;

	/* include per-STA, per-TID sequence counter */

	qc = ieee80211_get_qos_ctl(hdr);
	tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
	seq = &tx->sta->tid_seq[tid];

	hdr->seq_ctrl = cpu_to_le16(*seq);

	/* Increase the sequence number. */
	*seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;

	return TX_CONTINUE;
}

J
Johannes Berg 已提交
829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873
static int ieee80211_fragment(struct ieee80211_local *local,
			      struct sk_buff *skb, int hdrlen,
			      int frag_threshold)
{
	struct sk_buff *tail = skb, *tmp;
	int per_fragm = frag_threshold - hdrlen - FCS_LEN;
	int pos = hdrlen + per_fragm;
	int rem = skb->len - hdrlen - per_fragm;

	if (WARN_ON(rem < 0))
		return -EINVAL;

	while (rem) {
		int fraglen = per_fragm;

		if (fraglen > rem)
			fraglen = rem;
		rem -= fraglen;
		tmp = dev_alloc_skb(local->tx_headroom +
				    frag_threshold +
				    IEEE80211_ENCRYPT_HEADROOM +
				    IEEE80211_ENCRYPT_TAILROOM);
		if (!tmp)
			return -ENOMEM;
		tail->next = tmp;
		tail = tmp;
		skb_reserve(tmp, local->tx_headroom +
				 IEEE80211_ENCRYPT_HEADROOM);
		/* copy control information */
		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
		skb_copy_queue_mapping(tmp, skb);
		tmp->priority = skb->priority;
		tmp->dev = skb->dev;

		/* copy header and data */
		memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
		memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);

		pos += fraglen;
	}

	skb->len = hdrlen + per_fragm;
	return 0;
}

874
static ieee80211_tx_result debug_noinline
875 876
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
J
Johannes Berg 已提交
877 878 879
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
880
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
J
Johannes Berg 已提交
881 882
	int hdrlen;
	int fragnum;
883 884 885 886

	if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
		return TX_CONTINUE;

887 888
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
J
Johannes Berg 已提交
889
	 * This scenario is handled in ieee80211_tx_prepare but extra
890
	 * caution taken here as fragmented ampdu may cause Tx stop.
891
	 */
S
Sujith 已提交
892
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
893 894
		return TX_DROP;

895
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
896

J
Johannes Berg 已提交
897
	/* internal error, why is TX_FRAGMENTED set? */
898
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
J
Johannes Berg 已提交
899
		return TX_DROP;
900

J
Johannes Berg 已提交
901 902 903 904 905 906 907 908 909 910
	/*
	 * Now fragment the frame. This will allocate all the fragments and
	 * chain them (using skb as the first fragment) to skb->next.
	 * During transmission, we will remove the successfully transmitted
	 * fragments from this list. When the low-level driver rejects one
	 * of the fragments then we will simply pretend to accept the skb
	 * but store it away as pending.
	 */
	if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold))
		return TX_DROP;
911

J
Johannes Berg 已提交
912 913 914 915 916
	/* update duration/seq/flags of fragments */
	fragnum = 0;
	do {
		int next_len;
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
917

J
Johannes Berg 已提交
918 919
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
920

J
Johannes Berg 已提交
921 922 923
		if (skb->next) {
			hdr->frame_control |= morefrags;
			next_len = skb->next->len;
924 925 926 927 928 929 930 931 932 933
			/*
			 * No multi-rate retries for fragmented frames, that
			 * would completely throw off the NAV at other STAs.
			 */
			info->control.rates[1].idx = -1;
			info->control.rates[2].idx = -1;
			info->control.rates[3].idx = -1;
			info->control.rates[4].idx = -1;
			BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
			info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
J
Johannes Berg 已提交
934 935 936
		} else {
			hdr->frame_control &= ~morefrags;
			next_len = 0;
937
		}
J
Johannes Berg 已提交
938 939 940 941
		hdr->duration_id = ieee80211_duration(tx, 0, next_len);
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
	} while ((skb = skb->next));
942

943
	return TX_CONTINUE;
944 945
}

946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
{
	struct sk_buff *skb = tx->skb;

	if (!tx->sta)
		return TX_CONTINUE;

	tx->sta->tx_packets++;
	do {
		tx->sta->tx_fragments++;
		tx->sta->tx_bytes += skb->len;
	} while ((skb = skb->next));

	return TX_CONTINUE;
}

963
static ieee80211_tx_result debug_noinline
964 965
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
966 967
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);

968 969 970
	if (!tx->key)
		return TX_CONTINUE;

971 972 973
	switch (tx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
974
		return ieee80211_crypto_wep_encrypt(tx);
975
	case WLAN_CIPHER_SUITE_TKIP:
976
		return ieee80211_crypto_tkip_encrypt(tx);
977
	case WLAN_CIPHER_SUITE_CCMP:
978
		return ieee80211_crypto_ccmp_encrypt(tx);
979
	case WLAN_CIPHER_SUITE_AES_CMAC:
980
		return ieee80211_crypto_aes_cmac_encrypt(tx);
981 982 983 984 985 986 987 988
	default:
		/* handle hw-only algorithm */
		if (info->control.hw_key) {
			ieee80211_tx_set_protected(tx);
			return TX_CONTINUE;
		}
		break;

989 990 991 992 993
	}

	return TX_DROP;
}

994
static ieee80211_tx_result debug_noinline
J
Johannes Berg 已提交
995 996
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
J
Johannes Berg 已提交
997 998 999 1000
	struct sk_buff *skb = tx->skb;
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
J
Johannes Berg 已提交
1001

J
Johannes Berg 已提交
1002 1003
	do {
		hdr = (void *) skb->data;
1004 1005
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
J
Johannes Berg 已提交
1006 1007
		next_len = skb->next ? skb->next->len : 0;
		group_addr = is_multicast_ether_addr(hdr->addr1);
J
Johannes Berg 已提交
1008

J
Johannes Berg 已提交
1009 1010 1011
		hdr->duration_id =
			ieee80211_duration(tx, group_addr, next_len);
	} while ((skb = skb->next));
J
Johannes Berg 已提交
1012 1013 1014 1015

	return TX_CONTINUE;
}

1016 1017 1018 1019 1020 1021
/* actual transmit path */

/*
 * deal with packet injection down monitor interface
 * with Radiotap Header -- only called for monitor mode interface
 */
1022 1023
static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
					  struct sk_buff *skb)
1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035
{
	/*
	 * this is the moment to interpret and discard the radiotap header that
	 * must be at the start of the packet injected in Monitor mode
	 *
	 * Need to take some care with endian-ness since radiotap
	 * args are little-endian
	 */

	struct ieee80211_radiotap_iterator iterator;
	struct ieee80211_radiotap_header *rthdr =
		(struct ieee80211_radiotap_header *) skb->data;
1036
	struct ieee80211_supported_band *sband;
1037
	bool hw_frag;
J
Johannes Berg 已提交
1038
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
1039 1040
	int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
						   NULL);
1041

1042
	sband = tx->local->hw.wiphy->bands[tx->channel->band];
1043

J
Johannes Berg 已提交
1044
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1045
	tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1046

1047 1048 1049
	/* packet is fragmented in HW if we have a non-NULL driver callback */
	hw_frag = (tx->local->ops->set_frag_threshold != NULL);

1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078
	/*
	 * for every radiotap entry that is present
	 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
	 * entries present, or -EINVAL on error)
	 */

	while (!ret) {
		ret = ieee80211_radiotap_iterator_next(&iterator);

		if (ret)
			continue;

		/* see if this argument is something we can use */
		switch (iterator.this_arg_index) {
		/*
		 * You must take care when dereferencing iterator.this_arg
		 * for multibyte types... the pointer is not aligned.  Use
		 * get_unaligned((type *)iterator.this_arg) to dereference
		 * iterator.this_arg for type "type" safely on all arches.
		*/
		case IEEE80211_RADIOTAP_FLAGS:
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
				/*
				 * this indicates that the skb we have been
				 * handed has the 32-bit FCS CRC at the end...
				 * we should react to that by snipping it off
				 * because it will be recomputed and added
				 * on transmission
				 */
J
Johannes Berg 已提交
1079
				if (skb->len < (iterator._max_length + FCS_LEN))
1080
					return false;
1081 1082 1083

				skb_trim(skb, skb->len - FCS_LEN);
			}
1084
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
J
Johannes Berg 已提交
1085
				info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1086 1087
			if ((*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) &&
								!hw_frag)
1088
				tx->flags |= IEEE80211_TX_FRAGMENTED;
1089 1090
			break;

1091 1092 1093 1094 1095 1096
		/*
		 * Please update the file
		 * Documentation/networking/mac80211-injection.txt
		 * when parsing new fields here.
		 */

1097 1098 1099 1100 1101 1102
		default:
			break;
		}
	}

	if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1103
		return false;
1104 1105 1106

	/*
	 * remove the radiotap header
J
Johannes Berg 已提交
1107
	 * iterator->_max_length was sanity-checked against
1108 1109
	 * skb->len by iterator init
	 */
J
Johannes Berg 已提交
1110
	skb_pull(skb, iterator._max_length);
1111

1112
	return true;
1113 1114
}

1115 1116 1117 1118 1119 1120 1121 1122 1123 1124
static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
				  struct sk_buff *skb,
				  struct ieee80211_tx_info *info,
				  struct tid_ampdu_tx *tid_tx,
				  int tid)
{
	bool queued = false;

	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
		info->flags |= IEEE80211_TX_CTL_AMPDU;
1125 1126 1127 1128 1129
	} else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
		/*
		 * nothing -- this aggregation session is being started
		 * but that might still fail with the driver
		 */
1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167
	} else {
		spin_lock(&tx->sta->lock);
		/*
		 * Need to re-check now, because we may get here
		 *
		 *  1) in the window during which the setup is actually
		 *     already done, but not marked yet because not all
		 *     packets are spliced over to the driver pending
		 *     queue yet -- if this happened we acquire the lock
		 *     either before or after the splice happens, but
		 *     need to recheck which of these cases happened.
		 *
		 *  2) during session teardown, if the OPERATIONAL bit
		 *     was cleared due to the teardown but the pointer
		 *     hasn't been assigned NULL yet (or we loaded it
		 *     before it was assigned) -- in this case it may
		 *     now be NULL which means we should just let the
		 *     packet pass through because splicing the frames
		 *     back is already done.
		 */
		tid_tx = tx->sta->ampdu_mlme.tid_tx[tid];

		if (!tid_tx) {
			/* do nothing, let packet pass through */
		} else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
			info->flags |= IEEE80211_TX_CTL_AMPDU;
		} else {
			queued = true;
			info->control.vif = &tx->sdata->vif;
			info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
			__skb_queue_tail(&tid_tx->pending, skb);
		}
		spin_unlock(&tx->sta->lock);
	}

	return queued;
}

1168 1169 1170
/*
 * initialises @tx
 */
1171
static ieee80211_tx_result
J
Johannes Berg 已提交
1172 1173 1174
ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
		     struct sk_buff *skb)
1175
{
J
Johannes Berg 已提交
1176
	struct ieee80211_local *local = sdata->local;
1177
	struct ieee80211_hdr *hdr;
1178
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
S
Sujith 已提交
1179
	int hdrlen, tid;
1180
	u8 *qc;
1181 1182 1183 1184

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
J
Johannes Berg 已提交
1185
	tx->sdata = sdata;
1186
	tx->channel = local->hw.conf.channel;
1187
	/*
1188 1189
	 * Set this flag (used below to indicate "automatic fragmentation"),
	 * it will be cleared/left by radiotap as desired.
1190
	 * Only valid when fragmentation is done by the stack.
1191
	 */
1192 1193
	if (!local->ops->set_frag_threshold)
		tx->flags |= IEEE80211_TX_FRAGMENTED;
1194 1195

	/* process and remove the injection radiotap header */
1196
	if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) {
1197
		if (!__ieee80211_parse_tx_radiotap(tx, skb))
1198
			return TX_DROP;
1199

1200
		/*
1201 1202 1203
		 * __ieee80211_parse_tx_radiotap has now removed
		 * the radiotap header that was present and pre-filled
		 * 'tx' with tx control information.
1204
		 */
1205
		info->flags &= ~IEEE80211_TX_INTFL_HAS_RADIOTAP;
1206 1207
	}

1208 1209 1210 1211 1212 1213 1214
	/*
	 * If this flag is set to true anywhere, and we get here,
	 * we are doing the needed processing, so remove the flag
	 * now.
	 */
	info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;

1215 1216
	hdr = (struct ieee80211_hdr *) skb->data;

1217
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1218
		tx->sta = rcu_dereference(sdata->u.vlan.sta);
1219 1220
		if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
			return TX_DROP;
1221 1222
	} else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
		tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1223
	}
1224
	if (!tx->sta)
1225
		tx->sta = sta_info_get(sdata, hdr->addr1);
1226

1227 1228 1229 1230
	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
	    (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) {
		struct tid_ampdu_tx *tid_tx;

S
Sujith 已提交
1231 1232 1233
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1234 1235 1236
		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
		if (tid_tx) {
			bool queued;
1237

1238 1239 1240 1241 1242 1243
			queued = ieee80211_tx_prep_agg(tx, skb, info,
						       tid_tx, tid);

			if (unlikely(queued))
				return TX_QUEUED;
		}
S
Sujith 已提交
1244 1245
	}

1246
	if (is_multicast_ether_addr(hdr->addr1)) {
1247
		tx->flags &= ~IEEE80211_TX_UNICAST;
1248
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1249
	} else {
1250
		tx->flags |= IEEE80211_TX_UNICAST;
1251 1252 1253 1254
		if (unlikely(local->wifi_wme_noack_test))
			info->flags |= IEEE80211_TX_CTL_NO_ACK;
		else
			info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1255
	}
1256

1257 1258
	if (tx->flags & IEEE80211_TX_FRAGMENTED) {
		if ((tx->flags & IEEE80211_TX_UNICAST) &&
1259
		    skb->len + FCS_LEN > local->hw.wiphy->frag_threshold &&
1260
		    !(info->flags & IEEE80211_TX_CTL_AMPDU))
1261
			tx->flags |= IEEE80211_TX_FRAGMENTED;
1262
		else
1263
			tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1264 1265
	}

1266
	if (!tx->sta)
1267
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1268
	else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1269
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1270

1271
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
1272 1273 1274 1275
	if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
		u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
		tx->ethertype = (pos[0] << 8) | pos[1];
	}
1276
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1277

1278
	return TX_CONTINUE;
1279 1280
}

J
Johannes Berg 已提交
1281
static int __ieee80211_tx(struct ieee80211_local *local,
1282
			  struct sk_buff **skbp,
J
Johannes Berg 已提交
1283 1284
			  struct sta_info *sta,
			  bool txpending)
1285
{
1286
	struct sk_buff *skb = *skbp, *next;
1287
	struct ieee80211_tx_info *info;
1288
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
1289
	unsigned long flags;
1290
	int ret, len;
J
Johannes Berg 已提交
1291
	bool fragm = false;
1292

J
Johannes Berg 已提交
1293
	while (skb) {
J
Johannes Berg 已提交
1294 1295 1296 1297 1298 1299 1300 1301 1302 1303
		int q = skb_get_queue_mapping(skb);

		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		ret = IEEE80211_TX_OK;
		if (local->queue_stop_reasons[q] ||
		    (!txpending && !skb_queue_empty(&local->pending[q])))
			ret = IEEE80211_TX_PENDING;
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
		if (ret != IEEE80211_TX_OK)
			return ret;
1304

1305 1306 1307
		info = IEEE80211_SKB_CB(skb);

		if (fragm)
1308
			info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1309
					 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1310

J
Johannes Berg 已提交
1311
		next = skb->next;
1312
		len = skb->len;
1313

J
Johannes Berg 已提交
1314 1315 1316
		if (next)
			info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;

1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331
		sdata = vif_to_sdata(info->control.vif);

		switch (sdata->vif.type) {
		case NL80211_IFTYPE_MONITOR:
			info->control.vif = NULL;
			break;
		case NL80211_IFTYPE_AP_VLAN:
			info->control.vif = &container_of(sdata->bss,
				struct ieee80211_sub_if_data, u.ap)->vif;
			break;
		default:
			/* keep */
			break;
		}

J
Johannes Berg 已提交
1332 1333 1334 1335 1336
		if (sta && sta->uploaded)
			info->control.sta = &sta->sta;
		else
			info->control.sta = NULL;

1337
		ret = drv_tx(local, skb);
1338 1339 1340 1341
		if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) {
			dev_kfree_skb(skb);
			ret = NETDEV_TX_OK;
		}
1342 1343
		if (ret != NETDEV_TX_OK) {
			info->control.vif = &sdata->vif;
J
Johannes Berg 已提交
1344
			return IEEE80211_TX_AGAIN;
1345 1346
		}

1347
		*skbp = skb = next;
J
Johannes Berg 已提交
1348 1349
		ieee80211_led_tx(local, 1);
		fragm = true;
1350
	}
J
Johannes Berg 已提交
1351

1352 1353 1354
	return IEEE80211_TX_OK;
}

1355 1356 1357 1358 1359 1360 1361
/*
 * Invoke TX handlers, return 0 on success and non-zero if the
 * frame was dropped or queued.
 */
static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
{
	struct sk_buff *skb = tx->skb;
1362
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1363 1364
	ieee80211_tx_result res = TX_DROP;

1365 1366 1367 1368 1369 1370 1371
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1372
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1373 1374
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
1375
	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1376
	CALL_TXH(ieee80211_tx_h_select_key);
1377 1378
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1379 1380 1381 1382 1383

	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION))
		goto txh_done;

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1384 1385
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1386
	/* handlers after fragment must be aware of tx info fragmentation! */
1387 1388 1389
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
	CALL_TXH(ieee80211_tx_h_calculate_duration);
1390
#undef CALL_TXH
1391

1392
 txh_done:
1393
	if (unlikely(res == TX_DROP)) {
1394
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
J
Johannes Berg 已提交
1395 1396 1397 1398 1399 1400 1401
		while (skb) {
			struct sk_buff *next;

			next = skb->next;
			dev_kfree_skb(skb);
			skb = next;
		}
1402 1403
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1404
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1405 1406 1407 1408 1409 1410
		return -1;
	}

	return 0;
}

J
Johannes Berg 已提交
1411 1412
static void ieee80211_tx(struct ieee80211_sub_if_data *sdata,
			 struct sk_buff *skb, bool txpending)
1413
{
J
Johannes Berg 已提交
1414
	struct ieee80211_local *local = sdata->local;
1415
	struct ieee80211_tx_data tx;
1416
	ieee80211_tx_result res_prepare;
1417
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1418 1419 1420
	struct sk_buff *next;
	unsigned long flags;
	int ret, retries;
1421
	u16 queue;
1422

1423 1424
	queue = skb_get_queue_mapping(skb);

1425 1426
	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1427
		return;
1428 1429
	}

1430 1431
	rcu_read_lock();

1432
	/* initialises tx */
J
Johannes Berg 已提交
1433
	res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1434

1435
	if (unlikely(res_prepare == TX_DROP)) {
1436
		dev_kfree_skb(skb);
1437
		rcu_read_unlock();
1438 1439 1440 1441
		return;
	} else if (unlikely(res_prepare == TX_QUEUED)) {
		rcu_read_unlock();
		return;
1442 1443
	}

1444
	tx.channel = local->hw.conf.channel;
1445
	info->band = tx.channel->band;
1446

1447 1448
	if (invoke_tx_handlers(&tx))
		goto out;
1449

1450 1451
	retries = 0;
 retry:
J
Johannes Berg 已提交
1452
	ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending);
1453 1454 1455 1456
	switch (ret) {
	case IEEE80211_TX_OK:
		break;
	case IEEE80211_TX_AGAIN:
1457 1458 1459 1460 1461
		/*
		 * Since there are no fragmented frames on A-MPDU
		 * queues, there's no reason for a driver to reject
		 * a frame there, warn and drop it.
		 */
1462 1463 1464 1465 1466
		if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
			goto drop;
		/* fall through */
	case IEEE80211_TX_PENDING:
		skb = tx.skb;
1467

1468
		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1469

J
Johannes Berg 已提交
1470 1471 1472 1473 1474 1475
		if (local->queue_stop_reasons[queue] ||
		    !skb_queue_empty(&local->pending[queue])) {
			/*
			 * if queue is stopped, queue up frames for later
			 * transmission from the tasklet
			 */
1476 1477 1478
			do {
				next = skb->next;
				skb->next = NULL;
1479
				if (unlikely(txpending))
J
Johannes Berg 已提交
1480 1481
					__skb_queue_head(&local->pending[queue],
							 skb);
1482
				else
J
Johannes Berg 已提交
1483 1484
					__skb_queue_tail(&local->pending[queue],
							 skb);
1485 1486 1487 1488 1489
			} while ((skb = next));

			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);
		} else {
J
Johannes Berg 已提交
1490 1491 1492 1493
			/*
			 * otherwise retry, but this is a race condition or
			 * a driver bug (which we warn about if it persists)
			 */
1494 1495 1496 1497
			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);

			retries++;
J
Johannes Berg 已提交
1498
			if (WARN(retries > 10, "tx refused but queue active\n"))
1499
				goto drop;
1500 1501 1502
			goto retry;
		}
	}
1503
 out:
1504
	rcu_read_unlock();
1505
	return;
1506 1507

 drop:
1508
	rcu_read_unlock();
J
Johannes Berg 已提交
1509 1510 1511 1512 1513 1514 1515

	skb = tx.skb;
	while (skb) {
		next = skb->next;
		dev_kfree_skb(skb);
		skb = next;
	}
1516 1517 1518 1519
}

/* device xmit handlers */

1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547
static int ieee80211_skb_resize(struct ieee80211_local *local,
				struct sk_buff *skb,
				int head_need, bool may_encrypt)
{
	int tail_need = 0;

	/*
	 * This could be optimised, devices that do full hardware
	 * crypto (including TKIP MMIC) need no tailroom... But we
	 * have no drivers for such devices currently.
	 */
	if (may_encrypt) {
		tail_need = IEEE80211_ENCRYPT_TAILROOM;
		tail_need -= skb_tailroom(skb);
		tail_need = max_t(int, tail_need, 0);
	}

	if (head_need || tail_need) {
		/* Sorry. Can't account for this any more */
		skb_orphan(skb);
	}

	if (skb_header_cloned(skb))
		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
	else
		I802_DEBUG_INC(local->tx_expand_skb_head);

	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
J
Joe Perches 已提交
1548 1549
		wiphy_debug(local->hw.wiphy,
			    "failed to reallocate TX buffer\n");
1550 1551 1552 1553 1554 1555 1556 1557 1558
		return -ENOMEM;
	}

	/* update truesize too */
	skb->truesize += head_need + tail_need;

	return 0;
}

J
Johannes Berg 已提交
1559 1560
static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
			   struct sk_buff *skb)
1561
{
J
Johannes Berg 已提交
1562
	struct ieee80211_local *local = sdata->local;
1563
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1564
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
J
Johannes Berg 已提交
1565
	struct ieee80211_sub_if_data *tmp_sdata;
1566
	int headroom;
1567
	bool may_encrypt;
1568

1569 1570
	rcu_read_lock();

1571
	if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1572 1573 1574
		int hdrlen;
		u16 len_rthdr;

1575 1576
		info->flags |= IEEE80211_TX_CTL_INJECTED |
			       IEEE80211_TX_INTFL_HAS_RADIOTAP;
1577 1578

		len_rthdr = ieee80211_get_radiotap_len(skb->data);
1579
		hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593
		hdrlen = ieee80211_hdrlen(hdr->frame_control);

		/* check the header is complete in the frame */
		if (likely(skb->len >= len_rthdr + hdrlen)) {
			/*
			 * We process outgoing injected frames that have a
			 * local address we handle as though they are our
			 * own frames.
			 * This code here isn't entirely correct, the local
			 * MAC address is not necessarily enough to find
			 * the interface to use; for that proper VLAN/WDS
			 * support we will need a different mechanism.
			 */

J
Johannes Berg 已提交
1594
			list_for_each_entry_rcu(tmp_sdata, &local->interfaces,
1595
						list) {
1596
				if (!ieee80211_sdata_running(tmp_sdata))
1597
					continue;
1598 1599 1600 1601 1602 1603
				if (tmp_sdata->vif.type ==
				    NL80211_IFTYPE_MONITOR ||
				    tmp_sdata->vif.type ==
				    NL80211_IFTYPE_AP_VLAN ||
					tmp_sdata->vif.type ==
				    NL80211_IFTYPE_WDS)
1604
					continue;
1605
				if (compare_ether_addr(tmp_sdata->vif.addr,
1606
						       hdr->addr2) == 0) {
J
Johannes Berg 已提交
1607
					sdata = tmp_sdata;
1608 1609 1610 1611
					break;
				}
			}
		}
1612 1613
	}

J
Johannes Berg 已提交
1614
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1615

J
Johannes Berg 已提交
1616
	headroom = local->tx_headroom;
1617 1618 1619 1620 1621
	if (may_encrypt)
		headroom += IEEE80211_ENCRYPT_HEADROOM;
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

J
Johannes Berg 已提交
1622
	if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) {
1623
		dev_kfree_skb(skb);
1624
		rcu_read_unlock();
J
Johannes Berg 已提交
1625
		return;
1626 1627
	}

1628
	hdr = (struct ieee80211_hdr *) skb->data;
1629
	info->control.vif = &sdata->vif;
1630

1631 1632 1633 1634 1635
	if (ieee80211_vif_is_mesh(&sdata->vif) &&
	    ieee80211_is_data(hdr->frame_control) &&
		!is_multicast_ether_addr(hdr->addr1))
			if (mesh_nexthop_lookup(skb, sdata)) {
				/* skb queued: don't free */
1636
				rcu_read_unlock();
1637 1638 1639
				return;
			}

1640
	ieee80211_set_qos_hdr(local, skb);
J
Johannes Berg 已提交
1641
	ieee80211_tx(sdata, skb, false);
1642
	rcu_read_unlock();
1643 1644
}

1645 1646
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1647 1648
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1649
	struct ieee80211_channel *chan = local->hw.conf.channel;
1650 1651
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1652
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1653
	u16 len_rthdr;
1654

1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674
	/*
	 * Frame injection is not allowed if beaconing is not allowed
	 * or if we need radar detection. Beaconing is usually not allowed when
	 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
	 * Passive scan is also used in world regulatory domains where
	 * your country is not known and as such it should be treated as
	 * NO TX unless the channel is explicitly allowed in which case
	 * your current regulatory domain would not have the passive scan
	 * flag.
	 *
	 * Since AP mode uses monitor interfaces to inject/TX management
	 * frames we can make AP mode the exception to this rule once it
	 * supports radar detection as its implementation can deal with
	 * radar detection by itself. We can do that later by adding a
	 * monitor flag interfaces used for AP support.
	 */
	if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
	     IEEE80211_CHAN_PASSIVE_SCAN)))
		goto fail;

1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688
	/* check for not even having the fixed radiotap header part */
	if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
		goto fail; /* too short to be possibly valid */

	/* is it a header version we can trust to find length from? */
	if (unlikely(prthdr->it_version))
		goto fail; /* only version 0 is supported */

	/* then there must be a radiotap header with a length we can use */
	len_rthdr = ieee80211_get_radiotap_len(skb->data);

	/* does the skb contain enough to deliver on the alleged length? */
	if (unlikely(skb->len < len_rthdr))
		goto fail; /* skb too short for claimed rt header extent */
1689 1690 1691 1692 1693 1694 1695

	/*
	 * fix up the pointers accounting for the radiotap
	 * header still being in there.  We are being given
	 * a precooked IEEE80211 header so no need for
	 * normal processing
	 */
1696
	skb_set_mac_header(skb, len_rthdr);
1697
	/*
1698 1699
	 * these are just fixed to the end of the rt area since we
	 * don't have any better information and at this point, nobody cares
1700
	 */
1701 1702
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1703

J
Johannes Berg 已提交
1704 1705
	memset(info, 0, sizeof(*info));

1706 1707
	info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;

J
Johannes Berg 已提交
1708 1709
	/* pass the radiotap header up to xmit */
	ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1710
	return NETDEV_TX_OK;
1711 1712 1713 1714

fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731
}

/**
 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
 * subinterfaces (wlan#, WDS, and VLAN interfaces)
 * @skb: packet to be sent
 * @dev: incoming interface
 *
 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
 * not be freed, and caller is responsible for either retrying later or freeing
 * skb).
 *
 * This function takes in an Ethernet header and encapsulates it with suitable
 * IEEE 802.11 header based on which interface the packet is coming in. The
 * encapsulated packet will then be passed to master interface, wlan#.11, for
 * transmission (through low-level driver).
 */
1732 1733
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
				    struct net_device *dev)
1734
{
1735 1736
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
1737
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1738
	int ret = NETDEV_TX_BUSY, head_need;
1739 1740
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
1741
	struct ieee80211_hdr hdr;
1742
	struct ieee80211s_hdr mesh_hdr __maybe_unused;
1743 1744
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
1745
	int nh_pos, h_pos;
1746
	struct sta_info *sta = NULL;
1747
	u32 sta_flags = 0;
1748 1749

	if (unlikely(skb->len < ETH_HLEN)) {
1750
		ret = NETDEV_TX_OK;
1751 1752 1753 1754 1755 1756 1757 1758 1759
		goto fail;
	}

	nh_pos = skb_network_header(skb) - skb->data;
	h_pos = skb_transport_header(skb) - skb->data;

	/* convert Ethernet header to proper 802.11 header (based on
	 * operation mode) */
	ethertype = (skb->data[12] << 8) | skb->data[13];
1760
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1761

1762
	switch (sdata->vif.type) {
1763
	case NL80211_IFTYPE_AP_VLAN:
1764
		rcu_read_lock();
1765
		sta = rcu_dereference(sdata->u.vlan.sta);
1766 1767 1768 1769
		if (sta) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1770
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1771 1772 1773 1774 1775 1776 1777 1778 1779 1780
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
			hdrlen = 30;
			sta_flags = get_sta_flags(sta);
		}
		rcu_read_unlock();
		if (sta)
			break;
		/* fall through */
	case NL80211_IFTYPE_AP:
1781
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1782 1783
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
1784
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1785 1786
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
1787
		break;
1788
	case NL80211_IFTYPE_WDS:
1789
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1790 1791
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1792
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1793 1794 1795
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
1796
		break;
1797
#ifdef CONFIG_MAC80211_MESH
1798
	case NL80211_IFTYPE_MESH_POINT:
1799
		if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1800
			/* Do not send frames with mesh_ttl == 0 */
1801
			sdata->u.mesh.mshstats.dropped_frames_ttl++;
1802
			ret = NETDEV_TX_OK;
1803
			goto fail;
1804
		}
1805

1806 1807
		if (compare_ether_addr(sdata->vif.addr,
				       skb->data + ETH_ALEN) == 0) {
1808 1809 1810 1811
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
			meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
					sdata, NULL, NULL, NULL);
1812 1813 1814
		} else {
			/* packet from other interface */
			struct mesh_path *mppath;
1815
			int is_mesh_mcast = 1;
1816
			const u8 *mesh_da;
1817

1818
			rcu_read_lock();
1819
			if (is_multicast_ether_addr(skb->data))
1820 1821
				/* DA TA mSA AE:SA */
				mesh_da = skb->data;
1822
			else {
1823 1824 1825
				static const u8 bcast[ETH_ALEN] =
					{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

1826
				mppath = mpp_path_lookup(skb->data, sdata);
1827 1828 1829 1830
				if (mppath) {
					/* RA TA mDA mSA AE:DA SA */
					mesh_da = mppath->mpp;
					is_mesh_mcast = 0;
1831
				} else {
1832
					/* DA TA mSA AE:SA */
1833 1834
					mesh_da = bcast;
				}
1835
			}
1836
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1837
					mesh_da, sdata->vif.addr);
1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852
			rcu_read_unlock();
			if (is_mesh_mcast)
				meshhdrlen =
					ieee80211_new_mesh_header(&mesh_hdr,
							sdata,
							skb->data + ETH_ALEN,
							NULL,
							NULL);
			else
				meshhdrlen =
					ieee80211_new_mesh_header(&mesh_hdr,
							sdata,
							NULL,
							skb->data,
							skb->data + ETH_ALEN);
1853 1854

		}
1855 1856
		break;
#endif
1857
	case NL80211_IFTYPE_STATION:
1858
		memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1859 1860
		if (sdata->u.mgd.use_4addr &&
		    cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1861 1862
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
1863
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1864 1865 1866 1867 1868 1869 1870 1871 1872 1873
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
			hdrlen = 30;
		} else {
			fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
			/* BSSID SA DA */
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			hdrlen = 24;
		}
1874
		break;
1875
	case NL80211_IFTYPE_ADHOC:
1876 1877 1878
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1879
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1880
		hdrlen = 24;
1881 1882
		break;
	default:
1883
		ret = NETDEV_TX_OK;
1884 1885 1886
		goto fail;
	}

1887 1888 1889 1890 1891 1892
	/*
	 * There's no need to try to look up the destination
	 * if it is a multicast address (which can only happen
	 * in AP mode)
	 */
	if (!is_multicast_ether_addr(hdr.addr1)) {
1893
		rcu_read_lock();
1894 1895
		sta = sta_info_get(sdata, hdr.addr1);
		if (sta)
1896
			sta_flags = get_sta_flags(sta);
1897
		rcu_read_unlock();
1898 1899
	}

1900
	/* receiver and we are QoS enabled, use a QoS type frame */
1901
	if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) {
1902
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1903 1904 1905 1906
		hdrlen += 2;
	}

	/*
1907 1908
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
1909
	 */
1910 1911
	if (!ieee80211_vif_is_mesh(&sdata->vif) &&
		unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1912
		      !(sta_flags & WLAN_STA_AUTHORIZED) &&
1913
		      !(cpu_to_be16(ethertype) == sdata->control_port_protocol &&
1914
		       compare_ether_addr(sdata->vif.addr,
1915 1916 1917
					  skb->data + ETH_ALEN) == 0))) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (net_ratelimit())
1918
			printk(KERN_DEBUG "%s: dropped frame to %pM"
1919
			       " (unauthorized port)\n", dev->name,
1920
			       hdr.addr1);
1921 1922 1923 1924
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

1925
		ret = NETDEV_TX_OK;
1926 1927 1928
		goto fail;
	}

1929
	hdr.frame_control = fc;
1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950
	hdr.duration_id = 0;
	hdr.seq_ctrl = 0;

	skip_header_bytes = ETH_HLEN;
	if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
		encaps_data = bridge_tunnel_header;
		encaps_len = sizeof(bridge_tunnel_header);
		skip_header_bytes -= 2;
	} else if (ethertype >= 0x600) {
		encaps_data = rfc1042_header;
		encaps_len = sizeof(rfc1042_header);
		skip_header_bytes -= 2;
	} else {
		encaps_data = NULL;
		encaps_len = 0;
	}

	skb_pull(skb, skip_header_bytes);
	nh_pos -= skip_header_bytes;
	h_pos -= skip_header_bytes;

1951
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1952

1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963
	/*
	 * So we need to modify the skb header and hence need a copy of
	 * that. The head_need variable above doesn't, so far, include
	 * the needed header space that we don't need right away. If we
	 * can, then we don't reallocate right now but only after the
	 * frame arrives at the master device (if it does...)
	 *
	 * If we cannot, however, then we will reallocate to include all
	 * the ever needed space. Also, if we need to reallocate it anyway,
	 * make it big enough for everything we may ever need.
	 */
1964

1965
	if (head_need > 0 || skb_cloned(skb)) {
1966 1967 1968 1969
		head_need += IEEE80211_ENCRYPT_HEADROOM;
		head_need += local->tx_headroom;
		head_need = max_t(int, 0, head_need);
		if (ieee80211_skb_resize(local, skb, head_need, true))
1970 1971 1972 1973 1974 1975 1976 1977
			goto fail;
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
1978

1979
#ifdef CONFIG_MAC80211_MESH
1980 1981 1982 1983 1984
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}
1985
#endif
1986

1987
	if (ieee80211_is_data_qos(fc)) {
1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999
		__le16 *qos_control;

		qos_control = (__le16*) skb_push(skb, 2);
		memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
		/*
		 * Maybe we could actually set some fields here, for now just
		 * initialise to zero to indicate no special operation.
		 */
		*qos_control = 0;
	} else
		memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);

2000 2001 2002
	nh_pos += hdrlen;
	h_pos += hdrlen;

2003 2004
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
2005 2006 2007 2008 2009 2010 2011 2012

	/* Update skb pointers to various headers since this modified frame
	 * is going to go through Linux networking code that may potentially
	 * need things like pointer to IP header. */
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, nh_pos);
	skb_set_transport_header(skb, h_pos);

J
Johannes Berg 已提交
2013 2014
	memset(info, 0, sizeof(*info));

2015
	dev->trans_start = jiffies;
J
Johannes Berg 已提交
2016
	ieee80211_xmit(sdata, skb);
2017

2018
	return NETDEV_TX_OK;
2019 2020

 fail:
2021
	if (ret == NETDEV_TX_OK)
2022 2023 2024 2025 2026 2027
		dev_kfree_skb(skb);

	return ret;
}


2028 2029 2030 2031
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
2032 2033
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
J
Johannes Berg 已提交
2034
	int i;
2035

2036 2037
	for (i = 0; i < local->hw.queues; i++)
		skb_queue_purge(&local->pending[i]);
2038 2039
}

2040 2041 2042 2043 2044 2045 2046 2047 2048 2049
static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
				     struct sk_buff *skb)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_sub_if_data *sdata;
	struct sta_info *sta;
	struct ieee80211_hdr *hdr;
	int ret;
	bool result = true;

2050
	sdata = vif_to_sdata(info->control.vif);
2051 2052

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2053
		ieee80211_tx(sdata, skb, true);
2054 2055
	} else {
		hdr = (struct ieee80211_hdr *)skb->data;
2056
		sta = sta_info_get(sdata, hdr->addr1);
2057

J
Johannes Berg 已提交
2058
		ret = __ieee80211_tx(local, &skb, sta, true);
2059 2060 2061 2062 2063 2064 2065
		if (ret != IEEE80211_TX_OK)
			result = false;
	}

	return result;
}

2066
/*
J
Johannes Berg 已提交
2067
 * Transmit all pending packets. Called from tasklet.
2068
 */
2069 2070 2071
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
2072
	struct ieee80211_sub_if_data *sdata;
2073
	unsigned long flags;
2074
	int i;
J
Johannes Berg 已提交
2075
	bool txok;
2076

2077
	rcu_read_lock();
2078

J
Johannes Berg 已提交
2079
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2080 2081 2082 2083 2084
	for (i = 0; i < local->hw.queues; i++) {
		/*
		 * If queue is stopped by something other than due to pending
		 * frames, or we have no pending frames, proceed to next queue.
		 */
J
Johannes Berg 已提交
2085
		if (local->queue_stop_reasons[i] ||
2086
		    skb_queue_empty(&local->pending[i]))
2087
			continue;
2088

2089
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
2090
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2091 2092
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

2093 2094 2095 2096 2097
			if (WARN_ON(!info->control.vif)) {
				kfree_skb(skb);
				continue;
			}

J
Johannes Berg 已提交
2098 2099 2100 2101 2102 2103 2104 2105 2106
			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
						flags);

			txok = ieee80211_tx_pending_skb(local, skb);
			if (!txok)
				__skb_queue_head(&local->pending[i], skb);
			spin_lock_irqsave(&local->queue_stop_reason_lock,
					  flags);
			if (!txok)
2107
				break;
2108
		}
2109 2110 2111

		if (skb_queue_empty(&local->pending[i]))
			list_for_each_entry_rcu(sdata, &local->interfaces, list)
J
Johannes Berg 已提交
2112
				netif_wake_subqueue(sdata->dev, i);
2113
	}
J
Johannes Berg 已提交
2114
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2115

2116
	rcu_read_unlock();
2117 2118 2119 2120
}

/* functions for drivers to get certain frames */

R
Rami Rosen 已提交
2121
static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
2122 2123
				     struct sk_buff *skb,
				     struct beacon_data *beacon)
2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137
{
	u8 *pos, *tim;
	int aid0 = 0;
	int i, have_bits = 0, n1, n2;

	/* Generate bitmap for TIM only if there are any STAs in power save
	 * mode. */
	if (atomic_read(&bss->num_sta_ps) > 0)
		/* in the hope that this is faster than
		 * checking byte-for-byte */
		have_bits = !bitmap_empty((unsigned long*)bss->tim,
					  IEEE80211_MAX_AID+1);

	if (bss->dtim_count == 0)
2138
		bss->dtim_count = beacon->dtim_period - 1;
2139 2140 2141 2142 2143 2144 2145
	else
		bss->dtim_count--;

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
	*pos++ = bss->dtim_count;
2146
	*pos++ = beacon->dtim_period;
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 2176 2177 2178 2179 2180 2181 2182

	if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
		aid0 = 1;

	if (have_bits) {
		/* Find largest even number N1 so that bits numbered 1 through
		 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
		 * (N2 + 1) x 8 through 2007 are 0. */
		n1 = 0;
		for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
			if (bss->tim[i]) {
				n1 = i & 0xfe;
				break;
			}
		}
		n2 = n1;
		for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
			if (bss->tim[i]) {
				n2 = i;
				break;
			}
		}

		/* Bitmap control */
		*pos++ = n1 | aid0;
		/* Part Virt Bitmap */
		memcpy(pos, bss->tim + n1, n2 - n1 + 1);

		tim[1] = n2 - n1 + 4;
		skb_put(skb, n2 - n1);
	} else {
		*pos++ = aid0; /* Bitmap control */
		*pos++ = 0; /* Part Virt Bitmap */
	}
}

2183 2184 2185
struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
					 struct ieee80211_vif *vif,
					 u16 *tim_offset, u16 *tim_length)
2186 2187
{
	struct ieee80211_local *local = hw_to_local(hw);
2188
	struct sk_buff *skb = NULL;
2189
	struct ieee80211_tx_info *info;
2190 2191
	struct ieee80211_sub_if_data *sdata = NULL;
	struct ieee80211_if_ap *ap = NULL;
2192
	struct beacon_data *beacon;
2193
	struct ieee80211_supported_band *sband;
2194
	enum ieee80211_band band = local->hw.conf.channel->band;
2195
	struct ieee80211_tx_rate_control txrc;
2196

2197
	sband = local->hw.wiphy->bands[band];
2198 2199

	rcu_read_lock();
2200

2201
	sdata = vif_to_sdata(vif);
2202

2203 2204 2205 2206 2207
	if (tim_offset)
		*tim_offset = 0;
	if (tim_length)
		*tim_length = 0;

2208
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
2209 2210
		ap = &sdata->u.ap;
		beacon = rcu_dereference(ap->beacon);
J
Johannes Berg 已提交
2211 2212 2213 2214 2215 2216 2217 2218 2219 2220
		if (ap && beacon) {
			/*
			 * headroom, head length,
			 * tail length and maximum TIM length
			 */
			skb = dev_alloc_skb(local->tx_headroom +
					    beacon->head_len +
					    beacon->tail_len + 256);
			if (!skb)
				goto out;
2221

J
Johannes Berg 已提交
2222 2223 2224
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
2225

2226 2227 2228 2229 2230 2231 2232 2233
			/*
			 * Not very nice, but we want to allow the driver to call
			 * ieee80211_beacon_get() as a response to the set_tim()
			 * callback. That, however, is already invoked under the
			 * sta_lock to guarantee consistent and race-free update
			 * of the tim bitmap in mac80211 and the driver.
			 */
			if (local->tim_in_locked_section) {
R
Rami Rosen 已提交
2234
				ieee80211_beacon_add_tim(ap, skb, beacon);
2235 2236 2237 2238
			} else {
				unsigned long flags;

				spin_lock_irqsave(&local->sta_lock, flags);
R
Rami Rosen 已提交
2239
				ieee80211_beacon_add_tim(ap, skb, beacon);
2240 2241
				spin_unlock_irqrestore(&local->sta_lock, flags);
			}
2242

2243 2244 2245 2246 2247
			if (tim_offset)
				*tim_offset = beacon->head_len;
			if (tim_length)
				*tim_length = skb->len - beacon->head_len;

J
Johannes Berg 已提交
2248 2249 2250
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
2251 2252
		} else
			goto out;
2253
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2254
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2255
		struct ieee80211_hdr *hdr;
2256
		struct sk_buff *presp = rcu_dereference(ifibss->presp);
2257

2258
		if (!presp)
2259 2260
			goto out;

2261
		skb = skb_copy(presp, GFP_ATOMIC);
2262 2263 2264 2265
		if (!skb)
			goto out;

		hdr = (struct ieee80211_hdr *) skb->data;
2266 2267
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2268
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2269 2270 2271
		struct ieee80211_mgmt *mgmt;
		u8 *pos;

J
Johannes Berg 已提交
2272 2273 2274 2275 2276 2277 2278 2279 2280
		/* headroom, head length, tail length and maximum TIM length */
		skb = dev_alloc_skb(local->tx_headroom + 400);
		if (!skb)
			goto out;

		skb_reserve(skb, local->hw.extra_tx_headroom);
		mgmt = (struct ieee80211_mgmt *)
			skb_put(skb, 24 + sizeof(mgmt->u.beacon));
		memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2281 2282
		mgmt->frame_control =
		    cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2283
		memset(mgmt->da, 0xff, ETH_ALEN);
2284 2285
		memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
		memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
J
Johannes Berg 已提交
2286
		mgmt->u.beacon.beacon_int =
2287
			cpu_to_le16(sdata->vif.bss_conf.beacon_int);
J
Johannes Berg 已提交
2288 2289 2290 2291 2292 2293
		mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */

		pos = skb_put(skb, 2);
		*pos++ = WLAN_EID_SSID;
		*pos++ = 0x0;

2294
		mesh_mgmt_ies_add(skb, sdata);
2295 2296
	} else {
		WARN_ON(1);
2297
		goto out;
2298 2299
	}

2300 2301
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
2302
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2303
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
2304
	info->band = band;
2305 2306 2307 2308 2309 2310 2311

	memset(&txrc, 0, sizeof(txrc));
	txrc.hw = hw;
	txrc.sband = sband;
	txrc.bss_conf = &sdata->vif.bss_conf;
	txrc.skb = skb;
	txrc.reported_rate.idx = -1;
2312 2313 2314 2315 2316
	txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
	if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
		txrc.max_rate_idx = -1;
	else
		txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2317
	txrc.bss = true;
2318
	rate_control_get_rate(sdata, NULL, &txrc);
2319 2320

	info->control.vif = vif;
2321

2322 2323 2324
	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
			IEEE80211_TX_CTL_ASSIGN_SEQ |
			IEEE80211_TX_CTL_FIRST_FRAGMENT;
2325
 out:
2326
	rcu_read_unlock();
2327 2328
	return skb;
}
2329
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2330

2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408
struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
				     struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_managed *ifmgd;
	struct ieee80211_pspoll *pspoll;
	struct ieee80211_local *local;
	struct sk_buff *skb;

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

	sdata = vif_to_sdata(vif);
	ifmgd = &sdata->u.mgd;
	local = sdata->local;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for "
		       "pspoll template\n", sdata->name);
		return NULL;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
	memset(pspoll, 0, sizeof(*pspoll));
	pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
					    IEEE80211_STYPE_PSPOLL);
	pspoll->aid = cpu_to_le16(ifmgd->aid);

	/* aid in PS-Poll has its two MSBs each set to 1 */
	pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);

	memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
	memcpy(pspoll->ta, vif->addr, ETH_ALEN);

	return skb;
}
EXPORT_SYMBOL(ieee80211_pspoll_get);

struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
				       struct ieee80211_vif *vif)
{
	struct ieee80211_hdr_3addr *nullfunc;
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_managed *ifmgd;
	struct ieee80211_local *local;
	struct sk_buff *skb;

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

	sdata = vif_to_sdata(vif);
	ifmgd = &sdata->u.mgd;
	local = sdata->local;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
		       "template\n", sdata->name);
		return NULL;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
							  sizeof(*nullfunc));
	memset(nullfunc, 0, sizeof(*nullfunc));
	nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
					      IEEE80211_STYPE_NULLFUNC |
					      IEEE80211_FCTL_TODS);
	memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
	memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
	memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);

	return skb;
}
EXPORT_SYMBOL(ieee80211_nullfunc_get);

2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458
struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
				       struct ieee80211_vif *vif,
				       const u8 *ssid, size_t ssid_len,
				       const u8 *ie, size_t ie_len)
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_local *local;
	struct ieee80211_hdr_3addr *hdr;
	struct sk_buff *skb;
	size_t ie_ssid_len;
	u8 *pos;

	sdata = vif_to_sdata(vif);
	local = sdata->local;
	ie_ssid_len = 2 + ssid_len;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
			    ie_ssid_len + ie_len);
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
		       "request template\n", sdata->name);
		return NULL;
	}

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

	hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
	memset(hdr, 0, sizeof(*hdr));
	hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					 IEEE80211_STYPE_PROBE_REQ);
	memset(hdr->addr1, 0xff, ETH_ALEN);
	memcpy(hdr->addr2, vif->addr, ETH_ALEN);
	memset(hdr->addr3, 0xff, ETH_ALEN);

	pos = skb_put(skb, ie_ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = ssid_len;
	if (ssid)
		memcpy(pos, ssid, ssid_len);
	pos += ssid_len;

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

	return skb;
}
EXPORT_SYMBOL(ieee80211_probereq_get);

2459
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2460
		       const void *frame, size_t frame_len,
2461
		       const struct ieee80211_tx_info *frame_txctl,
2462 2463 2464 2465
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

2466 2467
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2468 2469
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
2470 2471 2472 2473 2474
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

2475
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2476
			     const void *frame, size_t frame_len,
2477
			     const struct ieee80211_tx_info *frame_txctl,
2478 2479 2480 2481
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

2482 2483
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2484 2485
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
2486 2487 2488 2489 2490
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
2491
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2492
			  struct ieee80211_vif *vif)
2493 2494
{
	struct ieee80211_local *local = hw_to_local(hw);
2495
	struct sk_buff *skb = NULL;
2496
	struct sta_info *sta;
2497
	struct ieee80211_tx_data tx;
2498 2499
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_ap *bss = NULL;
2500
	struct beacon_data *beacon;
2501
	struct ieee80211_tx_info *info;
2502

2503
	sdata = vif_to_sdata(vif);
2504
	bss = &sdata->u.ap;
2505 2506 2507 2508

	rcu_read_lock();
	beacon = rcu_dereference(bss->beacon);

2509
	if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2510
		goto out;
2511

2512
	if (bss->dtim_count != 0)
2513
		goto out; /* send buffered bc/mc only after DTIM beacon */
2514

2515 2516 2517
	while (1) {
		skb = skb_dequeue(&bss->ps_bc_buf);
		if (!skb)
2518
			goto out;
2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530
		local->total_ps_buffered--;

		if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
			struct ieee80211_hdr *hdr =
				(struct ieee80211_hdr *) skb->data;
			/* more buffered multicast/broadcast frames ==> set
			 * MoreData flag in IEEE 802.11 header to inform PS
			 * STAs */
			hdr->frame_control |=
				cpu_to_le16(IEEE80211_FCTL_MOREDATA);
		}

J
Johannes Berg 已提交
2531
		if (!ieee80211_tx_prepare(sdata, &tx, skb))
2532 2533 2534
			break;
		dev_kfree_skb_any(skb);
	}
2535 2536 2537

	info = IEEE80211_SKB_CB(skb);

2538
	sta = tx.sta;
2539 2540
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
	tx.channel = local->hw.conf.channel;
2541
	info->band = tx.channel->band;
2542

2543
	if (invoke_tx_handlers(&tx))
2544
		skb = NULL;
2545
 out:
2546
	rcu_read_unlock();
2547 2548 2549 2550

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
2551

2552
void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
J
Johannes Berg 已提交
2553 2554 2555 2556 2557
{
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

2558 2559 2560
	/* send all internal mgmt frames on VO */
	skb_set_queue_mapping(skb, 0);

2561 2562 2563 2564 2565 2566
	/*
	 * The other path calling ieee80211_xmit is from the tasklet,
	 * and while we can handle concurrent transmissions locking
	 * requirements are that we do not come into tx with bhs on.
	 */
	local_bh_disable();
J
Johannes Berg 已提交
2567
	ieee80211_xmit(sdata, skb);
2568
	local_bh_enable();
J
Johannes Berg 已提交
2569
}