tx.c 68.9 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

276
	if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
277 278
		return TX_CONTINUE;

279
	if (tx->flags & IEEE80211_TX_PS_BUFFERED)
280
		return TX_CONTINUE;
281

282
	sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
283

284
	if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
285
		if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
286
			     tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
287
			     ieee80211_is_data(hdr->frame_control))) {
288 289
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
			printk(KERN_DEBUG "%s: dropped data frame to not "
290
			       "associated station %pM\n",
291
			       tx->sdata->name, hdr->addr1);
292 293
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
			I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
294
			return TX_DROP;
295 296
		}
	} else {
297
		if (unlikely(ieee80211_is_data(hdr->frame_control) &&
298
			     tx->local->num_sta == 0 &&
299
			     tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
300 301 302 303
			/*
			 * No associated STAs - no need to send multicast
			 * frames.
			 */
304
			return TX_DROP;
305
		}
306
		return TX_CONTINUE;
307 308
	}

309
	return TX_CONTINUE;
310 311 312 313 314 315 316 317 318 319 320 321 322
}

/* 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;

323 324 325 326 327 328
	/*
	 * virtual interfaces are protected by RCU
	 */
	rcu_read_lock();

	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
329
		struct ieee80211_if_ap *ap;
330
		if (sdata->vif.type != NL80211_IFTYPE_AP)
331 332 333 334 335 336 337 338 339 340
			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);
	}

341
	list_for_each_entry_rcu(sta, &local->sta_list, list) {
342 343 344 345 346 347 348
		skb = skb_dequeue(&sta->ps_tx_buf);
		if (skb) {
			purged++;
			dev_kfree_skb(skb);
		}
		total += skb_queue_len(&sta->ps_tx_buf);
	}
349 350

	rcu_read_unlock();
351 352

	local->total_ps_buffered = total;
353
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
354
	printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
355
	       wiphy_name(local->hw.wiphy), purged);
356
#endif
357 358
}

359
static ieee80211_tx_result
360
ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
361
{
362
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
363
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
364

365 366 367 368 369 370 371 372
	/*
	 * 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.
	 */

373 374 375 376 377
	/* powersaving STAs only in AP/VLAN mode */
	if (!tx->sdata->bss)
		return TX_CONTINUE;

	/* no buffering for ordered frames */
378
	if (ieee80211_has_order(hdr->frame_control))
379
		return TX_CONTINUE;
380 381 382

	/* no stations in PS mode */
	if (!atomic_read(&tx->sdata->bss->num_sta_ps))
383
		return TX_CONTINUE;
384

385
	info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
J
Johannes Berg 已提交
386

387 388
	/* device releases frame after DTIM beacon */
	if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
J
Johannes Berg 已提交
389 390
		return TX_CONTINUE;

391
	/* buffered in mac80211 */
J
Johannes Berg 已提交
392 393 394 395
	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) {
396
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
J
Johannes Berg 已提交
397 398
		if (net_ratelimit())
			printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n",
399
			       tx->sdata->name);
400
#endif
J
Johannes Berg 已提交
401 402 403
		dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
	} else
		tx->local->total_ps_buffered++;
404

J
Johannes Berg 已提交
405
	skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
406

J
Johannes Berg 已提交
407
	return TX_QUEUED;
408 409
}

410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425
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;
}

426
static ieee80211_tx_result
427
ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
428 429
{
	struct sta_info *sta = tx->sta;
430
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
431
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
432
	struct ieee80211_local *local = tx->local;
433
	u32 staflags;
434

435 436 437 438 439
	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)))
440
		return TX_CONTINUE;
441

442 443
	staflags = get_sta_flags(sta);

444
	if (unlikely((staflags & (WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) &&
445
		     !(info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE))) {
446
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
447
		printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries "
448
		       "before %d)\n",
449
		       sta->sta.addr, sta->sta.aid,
450 451 452 453 454 455
		       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);
456
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
457
			if (net_ratelimit()) {
458
				printk(KERN_DEBUG "%s: STA %pM TX "
459
				       "buffer full - dropping oldest frame\n",
460
				       tx->sdata->name, sta->sta.addr);
461
			}
462
#endif
463 464 465
			dev_kfree_skb(old);
		} else
			tx->local->total_ps_buffered++;
466

467 468 469 470 471 472 473
		/*
		 * 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))
474 475
			sta_info_set_tim_bit(sta);

476
		info->control.jiffies = jiffies;
477
		info->control.vif = &tx->sdata->vif;
478
		info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
479
		skb_queue_tail(&sta->ps_tx_buf, tx->skb);
480 481 482 483 484 485

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

486
		return TX_QUEUED;
487 488
	}
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
489
	else if (unlikely(staflags & WLAN_STA_PS_STA)) {
490
		printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll "
491
		       "set -> send frame\n", tx->sdata->name,
492
		       sta->sta.addr);
493 494 495
	}
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */

496
	return TX_CONTINUE;
497 498
}

499
static ieee80211_tx_result debug_noinline
500
ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
501
{
502
	if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
503
		return TX_CONTINUE;
504

505
	if (tx->flags & IEEE80211_TX_UNICAST)
506 507 508 509 510
		return ieee80211_tx_h_unicast_ps_buf(tx);
	else
		return ieee80211_tx_h_multicast_ps_buf(tx);
}

511
static ieee80211_tx_result debug_noinline
512
ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
513
{
514
	struct ieee80211_key *key = NULL;
515
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
516
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
517

J
Johannes Berg 已提交
518
	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
519
		tx->key = NULL;
520 521
	else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
		tx->key = key;
522
	else if (ieee80211_is_mgmt(hdr->frame_control) &&
523 524
		 is_multicast_ether_addr(hdr->addr1) &&
		 ieee80211_is_robust_mgmt_frame(hdr) &&
525 526
		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
		tx->key = key;
527 528
	else if ((key = rcu_dereference(tx->sdata->default_key)))
		tx->key = key;
529
	else if (tx->sdata->drop_unencrypted &&
530
		 (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) &&
531 532 533 534
		 !(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)))) {
535
		I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
536
		return TX_DROP;
537
	} else
538 539 540
		tx->key = NULL;

	if (tx->key) {
541 542
		bool skip_hw = false;

543
		tx->key->tx_rx_count++;
544
		/* TODO: add threshold stuff again */
545 546 547

		switch (tx->key->conf.alg) {
		case ALG_WEP:
548
			if (ieee80211_is_auth(hdr->frame_control))
549 550
				break;
		case ALG_TKIP:
551
			if (!ieee80211_is_data_present(hdr->frame_control))
552 553
				tx->key = NULL;
			break;
554 555 556 557 558
		case ALG_CCMP:
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
559 560 561 562
			else
				skip_hw = (tx->key->conf.flags &
					   IEEE80211_KEY_FLAG_SW_MGMT) &&
					ieee80211_is_mgmt(hdr->frame_control);
563
			break;
564 565 566 567
		case ALG_AES_CMAC:
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
568
		}
569

J
Johannes Berg 已提交
570
		if (!skip_hw && tx->key &&
J
Johannes Berg 已提交
571
		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
572
			info->control.hw_key = &tx->key->conf;
573 574
	}

575
	return TX_CONTINUE;
576 577
}

578
static ieee80211_tx_result debug_noinline
579
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
580
{
581
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
582 583 584
	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *rate;
S
Shanyu Zhao 已提交
585 586
	int i;
	u32 len;
587 588
	bool inval = false, rts = false, short_preamble = false;
	struct ieee80211_tx_rate_control txrc;
589
	u32 sta_flags;
590

591
	memset(&txrc, 0, sizeof(txrc));
592

593
	sband = tx->local->hw.wiphy->bands[tx->channel->band];
594

S
Shanyu Zhao 已提交
595
	len = min_t(u32, tx->skb->len + FCS_LEN,
596
			 tx->local->hw.wiphy->frag_threshold);
597 598 599 600 601 602 603

	/* 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;
604 605 606 607 608
	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;
609
	txrc.ap = tx->sdata->vif.type == NL80211_IFTYPE_AP;
610 611

	/* set up RTS protection if desired */
612
	if (len > tx->local->hw.wiphy->rts_threshold) {
613
		txrc.rts = rts = true;
614 615
	}

616 617 618 619 620 621 622 623 624 625
	/*
	 * 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;
626

627 628 629 630 631 632
	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.
	 */
633
	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) &&
634 635 636 637 638
		 (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",
639
		 tx->sdata->name, hdr->addr1,
640 641
		 tx->channel->band ? 5 : 2))
		return TX_DROP;
642

643 644 645 646
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
647 648 649 650 651 652 653
	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];
654

655
	if (tx->sta)
656
		tx->sta->last_tx_rate = txrc.reported_rate;
657

658 659
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
660

661 662 663 664
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

665 666 667 668 669
	if (is_multicast_ether_addr(hdr->addr1)) {
		/*
		 * XXX: verify the rate is in the basic rateset
		 */
		return TX_CONTINUE;
670 671
	}

672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696
	/*
	 * 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;
697 698
	}

699 700 701 702 703 704 705 706 707 708 709 710 711 712
	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;
		}
713

714 715 716 717 718 719 720 721
		/*
		 * 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;
		}
722

723 724 725 726
		/* set up RTS protection if desired */
		if (rts)
			info->control.rates[i].flags |=
				IEEE80211_TX_RC_USE_RTS_CTS;
727

728
		/* RC is busted */
S
Sujith 已提交
729 730
		if (WARN_ON_ONCE(info->control.rates[i].idx >=
				 sband->n_bitrates)) {
731 732
			info->control.rates[i].idx = -1;
			continue;
733
		}
734

735 736 737 738 739 740 741 742 743 744 745 746 747
		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;
748 749
	}

750 751 752
	return TX_CONTINUE;
}

753 754 755 756 757 758 759 760 761
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;

762 763 764 765 766
	/*
	 * 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.
	 */
767
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
768 769
		return TX_CONTINUE;

770 771 772 773 774 775
	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
776 777 778 779 780
	/*
	 * Anything but QoS data that has a sequence number field
	 * (is long enough) gets a sequence number from the global
	 * counter.
	 */
781
	if (!ieee80211_is_data_qos(hdr->frame_control)) {
J
Johannes Berg 已提交
782
		/* driver should assign sequence number */
783
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
J
Johannes Berg 已提交
784 785 786
		/* 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;
787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811
		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
812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856
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;
}

857
static ieee80211_tx_result debug_noinline
858 859
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
J
Johannes Berg 已提交
860 861 862
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
863
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
J
Johannes Berg 已提交
864 865
	int hdrlen;
	int fragnum;
866 867 868 869

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

870 871
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
J
Johannes Berg 已提交
872
	 * This scenario is handled in ieee80211_tx_prepare but extra
873
	 * caution taken here as fragmented ampdu may cause Tx stop.
874
	 */
S
Sujith 已提交
875
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
876 877
		return TX_DROP;

878
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
879

J
Johannes Berg 已提交
880
	/* internal error, why is TX_FRAGMENTED set? */
881
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
J
Johannes Berg 已提交
882
		return TX_DROP;
883

J
Johannes Berg 已提交
884 885 886 887 888 889 890 891 892 893
	/*
	 * 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;
894

J
Johannes Berg 已提交
895 896 897 898 899
	/* update duration/seq/flags of fragments */
	fragnum = 0;
	do {
		int next_len;
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
900

J
Johannes Berg 已提交
901 902
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
903

J
Johannes Berg 已提交
904 905 906
		if (skb->next) {
			hdr->frame_control |= morefrags;
			next_len = skb->next->len;
907 908 909 910 911 912 913 914 915 916
			/*
			 * 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
917 918 919
		} else {
			hdr->frame_control &= ~morefrags;
			next_len = 0;
920
		}
J
Johannes Berg 已提交
921 922 923 924
		hdr->duration_id = ieee80211_duration(tx, 0, next_len);
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
	} while ((skb = skb->next));
925

926
	return TX_CONTINUE;
927 928
}

929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945
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;
}

946
static ieee80211_tx_result debug_noinline
947 948 949 950 951 952 953 954 955 956 957 958
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
	if (!tx->key)
		return TX_CONTINUE;

	switch (tx->key->conf.alg) {
	case ALG_WEP:
		return ieee80211_crypto_wep_encrypt(tx);
	case ALG_TKIP:
		return ieee80211_crypto_tkip_encrypt(tx);
	case ALG_CCMP:
		return ieee80211_crypto_ccmp_encrypt(tx);
959 960
	case ALG_AES_CMAC:
		return ieee80211_crypto_aes_cmac_encrypt(tx);
961 962 963 964 965 966 967
	}

	/* not reached */
	WARN_ON(1);
	return TX_DROP;
}

968
static ieee80211_tx_result debug_noinline
J
Johannes Berg 已提交
969 970
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
J
Johannes Berg 已提交
971 972 973 974
	struct sk_buff *skb = tx->skb;
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
J
Johannes Berg 已提交
975

J
Johannes Berg 已提交
976 977
	do {
		hdr = (void *) skb->data;
978 979
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
J
Johannes Berg 已提交
980 981
		next_len = skb->next ? skb->next->len : 0;
		group_addr = is_multicast_ether_addr(hdr->addr1);
J
Johannes Berg 已提交
982

J
Johannes Berg 已提交
983 984 985
		hdr->duration_id =
			ieee80211_duration(tx, group_addr, next_len);
	} while ((skb = skb->next));
J
Johannes Berg 已提交
986 987 988 989

	return TX_CONTINUE;
}

990 991 992 993 994 995
/* actual transmit path */

/*
 * deal with packet injection down monitor interface
 * with Radiotap Header -- only called for monitor mode interface
 */
996 997
static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
					  struct sk_buff *skb)
998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009
{
	/*
	 * 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;
1010
	struct ieee80211_supported_band *sband;
J
Johannes Berg 已提交
1011
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
1012 1013
	int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
						   NULL);
1014

1015
	sband = tx->local->hw.wiphy->bands[tx->channel->band];
1016

J
Johannes Berg 已提交
1017
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1018
	tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048

	/*
	 * 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
1049
				if (skb->len < (iterator._max_length + FCS_LEN))
1050
					return false;
1051 1052 1053

				skb_trim(skb, skb->len - FCS_LEN);
			}
1054
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
J
Johannes Berg 已提交
1055
				info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1056
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1057
				tx->flags |= IEEE80211_TX_FRAGMENTED;
1058 1059
			break;

1060 1061 1062 1063 1064 1065
		/*
		 * Please update the file
		 * Documentation/networking/mac80211-injection.txt
		 * when parsing new fields here.
		 */

1066 1067 1068 1069 1070 1071
		default:
			break;
		}
	}

	if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1072
		return false;
1073 1074 1075

	/*
	 * remove the radiotap header
J
Johannes Berg 已提交
1076
	 * iterator->_max_length was sanity-checked against
1077 1078
	 * skb->len by iterator init
	 */
J
Johannes Berg 已提交
1079
	skb_pull(skb, iterator._max_length);
1080

1081
	return true;
1082 1083
}

1084 1085 1086 1087 1088 1089 1090 1091 1092 1093
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;
1094 1095 1096 1097 1098
	} 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
		 */
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 1128 1129 1130 1131 1132 1133 1134 1135 1136
	} 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;
}

1137 1138 1139
/*
 * initialises @tx
 */
1140
static ieee80211_tx_result
J
Johannes Berg 已提交
1141 1142 1143
ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
		     struct sk_buff *skb)
1144
{
J
Johannes Berg 已提交
1145
	struct ieee80211_local *local = sdata->local;
1146
	struct ieee80211_hdr *hdr;
1147
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
S
Sujith 已提交
1148
	int hdrlen, tid;
1149
	u8 *qc;
1150 1151 1152 1153

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
J
Johannes Berg 已提交
1154
	tx->sdata = sdata;
1155
	tx->channel = local->hw.conf.channel;
1156
	/*
1157 1158
	 * Set this flag (used below to indicate "automatic fragmentation"),
	 * it will be cleared/left by radiotap as desired.
1159
	 */
1160
	tx->flags |= IEEE80211_TX_FRAGMENTED;
1161 1162

	/* process and remove the injection radiotap header */
1163
	if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) {
1164
		if (!__ieee80211_parse_tx_radiotap(tx, skb))
1165
			return TX_DROP;
1166

1167
		/*
1168 1169 1170
		 * __ieee80211_parse_tx_radiotap has now removed
		 * the radiotap header that was present and pre-filled
		 * 'tx' with tx control information.
1171
		 */
1172
		info->flags &= ~IEEE80211_TX_INTFL_HAS_RADIOTAP;
1173 1174
	}

1175 1176 1177 1178 1179 1180 1181
	/*
	 * 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;

1182 1183
	hdr = (struct ieee80211_hdr *) skb->data;

1184
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1185
		tx->sta = rcu_dereference(sdata->u.vlan.sta);
1186 1187
		if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
			return TX_DROP;
1188 1189
	} else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
		tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1190
	}
1191
	if (!tx->sta)
1192
		tx->sta = sta_info_get(sdata, hdr->addr1);
1193

1194 1195 1196 1197
	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
1198 1199 1200
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1201 1202 1203
		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
		if (tid_tx) {
			bool queued;
1204

1205 1206 1207 1208 1209 1210
			queued = ieee80211_tx_prep_agg(tx, skb, info,
						       tid_tx, tid);

			if (unlikely(queued))
				return TX_QUEUED;
		}
S
Sujith 已提交
1211 1212
	}

1213
	if (is_multicast_ether_addr(hdr->addr1)) {
1214
		tx->flags &= ~IEEE80211_TX_UNICAST;
1215
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1216
	} else {
1217
		tx->flags |= IEEE80211_TX_UNICAST;
1218 1219 1220 1221
		if (unlikely(local->wifi_wme_noack_test))
			info->flags |= IEEE80211_TX_CTL_NO_ACK;
		else
			info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1222
	}
1223

1224 1225
	if (tx->flags & IEEE80211_TX_FRAGMENTED) {
		if ((tx->flags & IEEE80211_TX_UNICAST) &&
1226
		    skb->len + FCS_LEN > local->hw.wiphy->frag_threshold &&
1227
		    !(info->flags & IEEE80211_TX_CTL_AMPDU))
1228
			tx->flags |= IEEE80211_TX_FRAGMENTED;
1229
		else
1230
			tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1231 1232
	}

1233
	if (!tx->sta)
1234
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1235
	else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1236
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1237

1238
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
1239 1240 1241 1242
	if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
		u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
		tx->ethertype = (pos[0] << 8) | pos[1];
	}
1243
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1244

1245
	return TX_CONTINUE;
1246 1247
}

J
Johannes Berg 已提交
1248
static int __ieee80211_tx(struct ieee80211_local *local,
1249
			  struct sk_buff **skbp,
J
Johannes Berg 已提交
1250 1251
			  struct sta_info *sta,
			  bool txpending)
1252
{
1253
	struct sk_buff *skb = *skbp, *next;
1254
	struct ieee80211_tx_info *info;
1255
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
1256
	unsigned long flags;
1257
	int ret, len;
J
Johannes Berg 已提交
1258
	bool fragm = false;
1259

J
Johannes Berg 已提交
1260
	while (skb) {
J
Johannes Berg 已提交
1261 1262 1263 1264 1265 1266 1267 1268 1269 1270
		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;
1271

1272 1273 1274
		info = IEEE80211_SKB_CB(skb);

		if (fragm)
1275
			info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1276
					 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1277

J
Johannes Berg 已提交
1278
		next = skb->next;
1279
		len = skb->len;
1280

J
Johannes Berg 已提交
1281 1282 1283
		if (next)
			info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;

1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298
		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
1299 1300 1301 1302 1303
		if (sta && sta->uploaded)
			info->control.sta = &sta->sta;
		else
			info->control.sta = NULL;

1304
		ret = drv_tx(local, skb);
1305 1306 1307 1308
		if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) {
			dev_kfree_skb(skb);
			ret = NETDEV_TX_OK;
		}
1309 1310
		if (ret != NETDEV_TX_OK) {
			info->control.vif = &sdata->vif;
J
Johannes Berg 已提交
1311
			return IEEE80211_TX_AGAIN;
1312 1313
		}

1314
		*skbp = skb = next;
J
Johannes Berg 已提交
1315 1316
		ieee80211_led_tx(local, 1);
		fragm = true;
1317
	}
J
Johannes Berg 已提交
1318

1319 1320 1321
	return IEEE80211_TX_OK;
}

1322 1323 1324 1325 1326 1327 1328
/*
 * 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;
1329
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1330 1331
	ieee80211_tx_result res = TX_DROP;

1332 1333 1334 1335 1336 1337 1338
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1339
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1340 1341 1342
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
	CALL_TXH(ieee80211_tx_h_select_key);
1343 1344
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1345 1346 1347 1348 1349

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

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1350 1351
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1352
	/* handlers after fragment must be aware of tx info fragmentation! */
1353 1354 1355
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
	CALL_TXH(ieee80211_tx_h_calculate_duration);
1356
#undef CALL_TXH
1357

1358
 txh_done:
1359
	if (unlikely(res == TX_DROP)) {
1360
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
J
Johannes Berg 已提交
1361 1362 1363 1364 1365 1366 1367
		while (skb) {
			struct sk_buff *next;

			next = skb->next;
			dev_kfree_skb(skb);
			skb = next;
		}
1368 1369
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1370
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1371 1372 1373 1374 1375 1376
		return -1;
	}

	return 0;
}

J
Johannes Berg 已提交
1377 1378
static void ieee80211_tx(struct ieee80211_sub_if_data *sdata,
			 struct sk_buff *skb, bool txpending)
1379
{
J
Johannes Berg 已提交
1380
	struct ieee80211_local *local = sdata->local;
1381
	struct ieee80211_tx_data tx;
1382
	ieee80211_tx_result res_prepare;
1383
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1384 1385 1386
	struct sk_buff *next;
	unsigned long flags;
	int ret, retries;
1387
	u16 queue;
1388

1389 1390
	queue = skb_get_queue_mapping(skb);

1391 1392
	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1393
		return;
1394 1395
	}

1396 1397
	rcu_read_lock();

1398
	/* initialises tx */
J
Johannes Berg 已提交
1399
	res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1400

1401
	if (unlikely(res_prepare == TX_DROP)) {
1402
		dev_kfree_skb(skb);
1403
		rcu_read_unlock();
1404 1405 1406 1407
		return;
	} else if (unlikely(res_prepare == TX_QUEUED)) {
		rcu_read_unlock();
		return;
1408 1409
	}

1410
	tx.channel = local->hw.conf.channel;
1411
	info->band = tx.channel->band;
1412

1413 1414
	if (invoke_tx_handlers(&tx))
		goto out;
1415

1416 1417
	retries = 0;
 retry:
J
Johannes Berg 已提交
1418
	ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending);
1419 1420 1421 1422
	switch (ret) {
	case IEEE80211_TX_OK:
		break;
	case IEEE80211_TX_AGAIN:
1423 1424 1425 1426 1427
		/*
		 * 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.
		 */
1428 1429 1430 1431 1432
		if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
			goto drop;
		/* fall through */
	case IEEE80211_TX_PENDING:
		skb = tx.skb;
1433

1434
		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1435

J
Johannes Berg 已提交
1436 1437 1438 1439 1440 1441
		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
			 */
1442 1443 1444
			do {
				next = skb->next;
				skb->next = NULL;
1445
				if (unlikely(txpending))
J
Johannes Berg 已提交
1446 1447
					__skb_queue_head(&local->pending[queue],
							 skb);
1448
				else
J
Johannes Berg 已提交
1449 1450
					__skb_queue_tail(&local->pending[queue],
							 skb);
1451 1452 1453 1454 1455
			} while ((skb = next));

			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);
		} else {
J
Johannes Berg 已提交
1456 1457 1458 1459
			/*
			 * otherwise retry, but this is a race condition or
			 * a driver bug (which we warn about if it persists)
			 */
1460 1461 1462 1463
			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);

			retries++;
J
Johannes Berg 已提交
1464
			if (WARN(retries > 10, "tx refused but queue active\n"))
1465
				goto drop;
1466 1467 1468
			goto retry;
		}
	}
1469
 out:
1470
	rcu_read_unlock();
1471
	return;
1472 1473

 drop:
1474
	rcu_read_unlock();
J
Johannes Berg 已提交
1475 1476 1477 1478 1479 1480 1481

	skb = tx.skb;
	while (skb) {
		next = skb->next;
		dev_kfree_skb(skb);
		skb = next;
	}
1482 1483 1484 1485
}

/* device xmit handlers */

1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524
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)) {
		printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n",
		       wiphy_name(local->hw.wiphy));
		return -ENOMEM;
	}

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

	return 0;
}

J
Johannes Berg 已提交
1525 1526
static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
			   struct sk_buff *skb)
1527
{
J
Johannes Berg 已提交
1528
	struct ieee80211_local *local = sdata->local;
1529
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1530
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
J
Johannes Berg 已提交
1531
	struct ieee80211_sub_if_data *tmp_sdata;
1532
	int headroom;
1533
	bool may_encrypt;
1534

1535 1536
	rcu_read_lock();

1537
	if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1538 1539 1540
		int hdrlen;
		u16 len_rthdr;

1541 1542
		info->flags |= IEEE80211_TX_CTL_INJECTED |
			       IEEE80211_TX_INTFL_HAS_RADIOTAP;
1543 1544

		len_rthdr = ieee80211_get_radiotap_len(skb->data);
1545
		hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559
		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
1560
			list_for_each_entry_rcu(tmp_sdata, &local->interfaces,
1561
						list) {
1562
				if (!ieee80211_sdata_running(tmp_sdata))
1563
					continue;
J
Johannes Berg 已提交
1564
				if (tmp_sdata->vif.type != NL80211_IFTYPE_AP)
1565
					continue;
1566
				if (compare_ether_addr(tmp_sdata->vif.addr,
1567
						       hdr->addr2) == 0) {
J
Johannes Berg 已提交
1568
					sdata = tmp_sdata;
1569 1570 1571 1572
					break;
				}
			}
		}
1573 1574
	}

J
Johannes Berg 已提交
1575
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1576

J
Johannes Berg 已提交
1577
	headroom = local->tx_headroom;
1578 1579 1580 1581 1582
	if (may_encrypt)
		headroom += IEEE80211_ENCRYPT_HEADROOM;
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

J
Johannes Berg 已提交
1583
	if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) {
1584
		dev_kfree_skb(skb);
1585
		rcu_read_unlock();
J
Johannes Berg 已提交
1586
		return;
1587 1588
	}

1589
	info->control.vif = &sdata->vif;
1590

1591 1592 1593 1594 1595
	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 */
1596
				rcu_read_unlock();
1597 1598 1599
				return;
			}

1600
	ieee80211_set_qos_hdr(local, skb);
J
Johannes Berg 已提交
1601
	ieee80211_tx(sdata, skb, false);
1602
	rcu_read_unlock();
1603 1604
}

1605 1606
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1607 1608
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1609
	struct ieee80211_channel *chan = local->hw.conf.channel;
1610 1611
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1612
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1613
	u16 len_rthdr;
1614

1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634
	/*
	 * 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;

1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648
	/* 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 */
1649 1650 1651 1652 1653 1654 1655

	/*
	 * 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
	 */
1656
	skb_set_mac_header(skb, len_rthdr);
1657
	/*
1658 1659
	 * 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
1660
	 */
1661 1662
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1663

J
Johannes Berg 已提交
1664 1665
	memset(info, 0, sizeof(*info));

1666 1667
	info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;

J
Johannes Berg 已提交
1668 1669
	/* pass the radiotap header up to xmit */
	ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1670
	return NETDEV_TX_OK;
1671 1672 1673 1674

fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691
}

/**
 * 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).
 */
1692 1693
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
				    struct net_device *dev)
1694
{
1695 1696
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
1697
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1698
	int ret = NETDEV_TX_BUSY, head_need;
1699 1700
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
1701
	struct ieee80211_hdr hdr;
1702
	struct ieee80211s_hdr mesh_hdr;
1703 1704
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
1705
	int nh_pos, h_pos;
1706
	struct sta_info *sta = NULL;
1707
	u32 sta_flags = 0;
1708 1709

	if (unlikely(skb->len < ETH_HLEN)) {
1710
		ret = NETDEV_TX_OK;
1711 1712 1713 1714 1715 1716 1717 1718 1719
		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];
1720
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1721

1722
	switch (sdata->vif.type) {
1723
	case NL80211_IFTYPE_AP_VLAN:
1724
		rcu_read_lock();
1725
		sta = rcu_dereference(sdata->u.vlan.sta);
1726 1727 1728 1729
		if (sta) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1730
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1731 1732 1733 1734 1735 1736 1737 1738 1739 1740
			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:
1741
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1742 1743
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
1744
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1745 1746
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
1747
		break;
1748
	case NL80211_IFTYPE_WDS:
1749
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1750 1751
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1752
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1753 1754 1755
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
1756
		break;
1757
#ifdef CONFIG_MAC80211_MESH
1758
	case NL80211_IFTYPE_MESH_POINT:
1759
		if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1760
			/* Do not send frames with mesh_ttl == 0 */
1761
			sdata->u.mesh.mshstats.dropped_frames_ttl++;
1762
			ret = NETDEV_TX_OK;
1763
			goto fail;
1764
		}
1765

1766 1767
		if (compare_ether_addr(sdata->vif.addr,
				       skb->data + ETH_ALEN) == 0) {
1768 1769 1770 1771
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
			meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
					sdata, NULL, NULL, NULL);
1772 1773 1774
		} else {
			/* packet from other interface */
			struct mesh_path *mppath;
1775
			int is_mesh_mcast = 1;
1776
			const u8 *mesh_da;
1777

1778
			rcu_read_lock();
1779
			if (is_multicast_ether_addr(skb->data))
1780 1781
				/* DA TA mSA AE:SA */
				mesh_da = skb->data;
1782
			else {
1783 1784 1785
				static const u8 bcast[ETH_ALEN] =
					{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

1786
				mppath = mpp_path_lookup(skb->data, sdata);
1787 1788 1789 1790
				if (mppath) {
					/* RA TA mDA mSA AE:DA SA */
					mesh_da = mppath->mpp;
					is_mesh_mcast = 0;
1791
				} else {
1792
					/* DA TA mSA AE:SA */
1793 1794
					mesh_da = bcast;
				}
1795
			}
1796
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1797
					mesh_da, sdata->vif.addr);
1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812
			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);
1813 1814

		}
1815 1816
		break;
#endif
1817
	case NL80211_IFTYPE_STATION:
1818
		memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1819
		if (sdata->u.mgd.use_4addr && ethertype != ETH_P_PAE) {
1820 1821
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
1822
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1823 1824 1825 1826 1827 1828 1829 1830 1831 1832
			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;
		}
1833
		break;
1834
	case NL80211_IFTYPE_ADHOC:
1835 1836 1837
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1838
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1839
		hdrlen = 24;
1840 1841
		break;
	default:
1842
		ret = NETDEV_TX_OK;
1843 1844 1845
		goto fail;
	}

1846 1847 1848 1849 1850 1851
	/*
	 * 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)) {
1852
		rcu_read_lock();
1853 1854
		sta = sta_info_get(sdata, hdr.addr1);
		if (sta)
1855
			sta_flags = get_sta_flags(sta);
1856
		rcu_read_unlock();
1857 1858
	}

1859
	/* receiver and we are QoS enabled, use a QoS type frame */
1860
	if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) {
1861
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1862 1863 1864 1865
		hdrlen += 2;
	}

	/*
1866 1867
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
1868
	 */
1869 1870
	if (!ieee80211_vif_is_mesh(&sdata->vif) &&
		unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1871 1872
		      !(sta_flags & WLAN_STA_AUTHORIZED) &&
		      !(ethertype == ETH_P_PAE &&
1873
		       compare_ether_addr(sdata->vif.addr,
1874 1875 1876
					  skb->data + ETH_ALEN) == 0))) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (net_ratelimit())
1877
			printk(KERN_DEBUG "%s: dropped frame to %pM"
1878
			       " (unauthorized port)\n", dev->name,
1879
			       hdr.addr1);
1880 1881 1882 1883
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

1884
		ret = NETDEV_TX_OK;
1885 1886 1887
		goto fail;
	}

1888
	hdr.frame_control = fc;
1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909
	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;

1910
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1911

1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922
	/*
	 * 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.
	 */
1923

1924
	if (head_need > 0 || skb_cloned(skb)) {
1925 1926 1927 1928
		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))
1929 1930 1931 1932 1933 1934 1935 1936
			goto fail;
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
1937

1938
#ifdef CONFIG_MAC80211_MESH
1939 1940 1941 1942 1943
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}
1944
#endif
1945

1946
	if (ieee80211_is_data_qos(fc)) {
1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958
		__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);

1959 1960 1961
	nh_pos += hdrlen;
	h_pos += hdrlen;

1962 1963
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
1964 1965 1966 1967 1968 1969 1970 1971

	/* 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
1972 1973
	memset(info, 0, sizeof(*info));

1974
	dev->trans_start = jiffies;
J
Johannes Berg 已提交
1975
	ieee80211_xmit(sdata, skb);
1976

1977
	return NETDEV_TX_OK;
1978 1979

 fail:
1980
	if (ret == NETDEV_TX_OK)
1981 1982 1983 1984 1985 1986
		dev_kfree_skb(skb);

	return ret;
}


1987 1988 1989 1990
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
1991 1992
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
J
Johannes Berg 已提交
1993
	int i;
1994

1995 1996
	for (i = 0; i < local->hw.queues; i++)
		skb_queue_purge(&local->pending[i]);
1997 1998
}

1999 2000 2001 2002 2003 2004 2005 2006 2007 2008
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;

2009
	sdata = vif_to_sdata(info->control.vif);
2010 2011

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2012
		ieee80211_tx(sdata, skb, true);
2013 2014
	} else {
		hdr = (struct ieee80211_hdr *)skb->data;
2015
		sta = sta_info_get(sdata, hdr->addr1);
2016

J
Johannes Berg 已提交
2017
		ret = __ieee80211_tx(local, &skb, sta, true);
2018 2019 2020 2021 2022 2023 2024
		if (ret != IEEE80211_TX_OK)
			result = false;
	}

	return result;
}

2025
/*
J
Johannes Berg 已提交
2026
 * Transmit all pending packets. Called from tasklet.
2027
 */
2028 2029 2030
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
2031
	struct ieee80211_sub_if_data *sdata;
2032
	unsigned long flags;
2033
	int i;
J
Johannes Berg 已提交
2034
	bool txok;
2035

2036
	rcu_read_lock();
2037

J
Johannes Berg 已提交
2038
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2039 2040 2041 2042 2043
	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
2044
		if (local->queue_stop_reasons[i] ||
2045
		    skb_queue_empty(&local->pending[i]))
2046
			continue;
2047

2048
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
2049
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2050 2051
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

2052 2053 2054 2055 2056
			if (WARN_ON(!info->control.vif)) {
				kfree_skb(skb);
				continue;
			}

J
Johannes Berg 已提交
2057 2058 2059 2060 2061 2062 2063 2064 2065
			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)
2066
				break;
2067
		}
2068 2069 2070 2071 2072

		if (skb_queue_empty(&local->pending[i]))
			list_for_each_entry_rcu(sdata, &local->interfaces, list)
				netif_tx_wake_queue(
					netdev_get_tx_queue(sdata->dev, i));
2073
	}
J
Johannes Berg 已提交
2074
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2075

2076
	rcu_read_unlock();
2077 2078 2079 2080
}

/* functions for drivers to get certain frames */

R
Rami Rosen 已提交
2081
static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
2082 2083
				     struct sk_buff *skb,
				     struct beacon_data *beacon)
2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097
{
	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)
2098
		bss->dtim_count = beacon->dtim_period - 1;
2099 2100 2101 2102 2103 2104 2105
	else
		bss->dtim_count--;

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
	*pos++ = bss->dtim_count;
2106
	*pos++ = beacon->dtim_period;
2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142

	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 */
	}
}

2143 2144 2145
struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
					 struct ieee80211_vif *vif,
					 u16 *tim_offset, u16 *tim_length)
2146 2147
{
	struct ieee80211_local *local = hw_to_local(hw);
2148
	struct sk_buff *skb = NULL;
2149
	struct ieee80211_tx_info *info;
2150 2151
	struct ieee80211_sub_if_data *sdata = NULL;
	struct ieee80211_if_ap *ap = NULL;
2152
	struct beacon_data *beacon;
2153
	struct ieee80211_supported_band *sband;
2154
	enum ieee80211_band band = local->hw.conf.channel->band;
2155
	struct ieee80211_tx_rate_control txrc;
2156

2157
	sband = local->hw.wiphy->bands[band];
2158 2159

	rcu_read_lock();
2160

2161
	sdata = vif_to_sdata(vif);
2162

2163 2164 2165 2166 2167
	if (tim_offset)
		*tim_offset = 0;
	if (tim_length)
		*tim_length = 0;

2168
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
2169 2170
		ap = &sdata->u.ap;
		beacon = rcu_dereference(ap->beacon);
J
Johannes Berg 已提交
2171 2172 2173 2174 2175 2176 2177 2178 2179 2180
		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;
2181

J
Johannes Berg 已提交
2182 2183 2184
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
2185

2186 2187 2188 2189 2190 2191 2192 2193
			/*
			 * 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
2194
				ieee80211_beacon_add_tim(ap, skb, beacon);
2195 2196 2197 2198
			} else {
				unsigned long flags;

				spin_lock_irqsave(&local->sta_lock, flags);
R
Rami Rosen 已提交
2199
				ieee80211_beacon_add_tim(ap, skb, beacon);
2200 2201
				spin_unlock_irqrestore(&local->sta_lock, flags);
			}
2202

2203 2204 2205 2206 2207
			if (tim_offset)
				*tim_offset = beacon->head_len;
			if (tim_length)
				*tim_length = skb->len - beacon->head_len;

J
Johannes Berg 已提交
2208 2209 2210
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
2211 2212
		} else
			goto out;
2213
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2214
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2215
		struct ieee80211_hdr *hdr;
2216
		struct sk_buff *presp = rcu_dereference(ifibss->presp);
2217

2218
		if (!presp)
2219 2220
			goto out;

2221
		skb = skb_copy(presp, GFP_ATOMIC);
2222 2223 2224 2225
		if (!skb)
			goto out;

		hdr = (struct ieee80211_hdr *) skb->data;
2226 2227
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2228
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2229 2230 2231
		struct ieee80211_mgmt *mgmt;
		u8 *pos;

J
Johannes Berg 已提交
2232 2233 2234 2235 2236 2237 2238 2239 2240
		/* 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));
2241 2242
		mgmt->frame_control =
		    cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2243
		memset(mgmt->da, 0xff, ETH_ALEN);
2244 2245
		memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
		memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
J
Johannes Berg 已提交
2246
		mgmt->u.beacon.beacon_int =
2247
			cpu_to_le16(sdata->vif.bss_conf.beacon_int);
J
Johannes Berg 已提交
2248 2249 2250 2251 2252 2253
		mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */

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

2254
		mesh_mgmt_ies_add(skb, sdata);
2255 2256
	} else {
		WARN_ON(1);
2257
		goto out;
2258 2259
	}

2260 2261
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
2262
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2263
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
2264
	info->band = band;
2265 2266 2267 2268 2269 2270 2271

	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;
2272 2273 2274 2275 2276
	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;
2277 2278
	txrc.ap = true;
	rate_control_get_rate(sdata, NULL, &txrc);
2279 2280

	info->control.vif = vif;
2281

2282 2283 2284
	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
			IEEE80211_TX_CTL_ASSIGN_SEQ |
			IEEE80211_TX_CTL_FIRST_FRAGMENT;
2285
 out:
2286
	rcu_read_unlock();
2287 2288
	return skb;
}
2289
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2290

2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 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
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);

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 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418
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);

2419
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2420
		       const void *frame, size_t frame_len,
2421
		       const struct ieee80211_tx_info *frame_txctl,
2422 2423 2424 2425
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

2426 2427
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2428 2429
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
2430 2431 2432 2433 2434
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

2435
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2436
			     const void *frame, size_t frame_len,
2437
			     const struct ieee80211_tx_info *frame_txctl,
2438 2439 2440 2441
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

2442 2443
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2444 2445
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
2446 2447 2448 2449 2450
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
2451
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2452
			  struct ieee80211_vif *vif)
2453 2454
{
	struct ieee80211_local *local = hw_to_local(hw);
2455
	struct sk_buff *skb = NULL;
2456
	struct sta_info *sta;
2457
	struct ieee80211_tx_data tx;
2458 2459
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_ap *bss = NULL;
2460
	struct beacon_data *beacon;
2461
	struct ieee80211_tx_info *info;
2462

2463
	sdata = vif_to_sdata(vif);
2464
	bss = &sdata->u.ap;
2465 2466 2467 2468

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

2469
	if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2470
		goto out;
2471

2472
	if (bss->dtim_count != 0)
2473
		goto out; /* send buffered bc/mc only after DTIM beacon */
2474

2475 2476 2477
	while (1) {
		skb = skb_dequeue(&bss->ps_bc_buf);
		if (!skb)
2478
			goto out;
2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490
		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
2491
		if (!ieee80211_tx_prepare(sdata, &tx, skb))
2492 2493 2494
			break;
		dev_kfree_skb_any(skb);
	}
2495 2496 2497

	info = IEEE80211_SKB_CB(skb);

2498
	sta = tx.sta;
2499 2500
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
	tx.channel = local->hw.conf.channel;
2501
	info->band = tx.channel->band;
2502

2503
	if (invoke_tx_handlers(&tx))
2504
		skb = NULL;
2505
 out:
2506
	rcu_read_unlock();
2507 2508 2509 2510

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
2511

2512
void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
J
Johannes Berg 已提交
2513 2514 2515 2516 2517
{
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

2518 2519 2520
	/* send all internal mgmt frames on VO */
	skb_set_queue_mapping(skb, 0);

2521 2522 2523 2524 2525 2526
	/*
	 * 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
2527
	ieee80211_xmit(sdata, skb);
2528
	local_bh_enable();
J
Johannes Berg 已提交
2529
}