tx.c 74.4 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 <linux/export.h>
22
#include <net/net_namespace.h>
23 24 25 26 27 28
#include <net/ieee80211_radiotap.h>
#include <net/cfg80211.h>
#include <net/mac80211.h>
#include <asm/unaligned.h>

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

/* misc utils */

39 40
static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
				 struct sk_buff *skb, int group_addr,
J
Johannes Berg 已提交
41
				 int next_frag_len)
42 43
{
	int rate, mrate, erp, dur, i;
44
	struct ieee80211_rate *txrate;
45
	struct ieee80211_local *local = tx->local;
46
	struct ieee80211_supported_band *sband;
47
	struct ieee80211_hdr *hdr;
48
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
49 50 51 52 53 54 55 56

	/* 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;
57

58
	sband = local->hw.wiphy->bands[tx->channel->band];
59
	txrate = &sband->bitrates[info->control.rates[0].idx];
60

61
	erp = txrate->flags & IEEE80211_RATE_ERP_G;
62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79

	/*
	 * 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
	 */
80
	hdr = (struct ieee80211_hdr *)skb->data;
81
	if (ieee80211_is_ctl(hdr->frame_control)) {
82
		/* TODO: These control frames are not currently sent by
J
Johannes Berg 已提交
83
		 * mac80211, but should they be implemented, this function
84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
		 * 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
101
		return cpu_to_le16(32768);
102 103 104 105 106 107 108 109 110 111 112 113 114 115 116

	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;
117 118 119 120
	/* 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];
121

122 123
		if (r->bitrate > txrate->bitrate)
			break;
124

J
Johannes Berg 已提交
125
		if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146
			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;
		}
147 148 149 150 151 152 153
	}
	if (rate == -1) {
		/* No matching basic rate found; use highest suitable mandatory
		 * PHY rate */
		rate = mrate;
	}

154 155 156 157 158 159 160 161 162
	/* Don't calculate ACKs for QoS Frames with NoAck Policy set */
	if (ieee80211_is_data_qos(hdr->frame_control) &&
	    *(ieee80211_get_qos_ctl(hdr)) | IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
		dur = 0;
	else
		/* 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
163
				tx->sdata->vif.bss_conf.use_short_preamble);
164 165 166 167 168 169 170

	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,
171
				txrate->bitrate, erp,
J
Johannes Berg 已提交
172
				tx->sdata->vif.bss_conf.use_short_preamble);
173 174
	}

J
Johannes Berg 已提交
175
	return cpu_to_le16(dur);
176 177
}

178
static inline int is_ieee80211_device(struct ieee80211_local *local,
179
				      struct net_device *dev)
180
{
181
	return local == wdev_priv(dev->ieee80211_ptr);
182 183 184
}

/* tx handlers */
185 186 187 188
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
{
	struct ieee80211_local *local = tx->local;
189
	struct ieee80211_if_managed *ifmgd;
190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213

	/* 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;

214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237
	/* 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;

238 239 240
	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
		ieee80211_stop_queues_by_reason(&local->hw,
						IEEE80211_QUEUE_STOP_REASON_PS);
241
		ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
242 243 244 245
		ieee80211_queue_work(&local->hw,
				     &local->dynamic_ps_disable_work);
	}

246 247 248 249
	/* Don't restart the timer if we're not disassociated */
	if (!ifmgd->associated)
		return TX_CONTINUE;

250 251 252 253 254
	mod_timer(&local->dynamic_ps_timer, jiffies +
		  msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));

	return TX_CONTINUE;
}
255

256
static ieee80211_tx_result debug_noinline
257
ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
258
{
259

260 261
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
J
Johannes Berg 已提交
262
	bool assoc = false;
263

264
	if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
265
		return TX_CONTINUE;
266

267 268
	if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
	    test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
269 270 271 272 273 274 275 276 277 278 279 280 281
	    !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
		 */
282
		return TX_DROP;
283

B
Bill Jordan 已提交
284 285 286
	if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
		return TX_CONTINUE;

287
	if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
288 289
		return TX_CONTINUE;

290
	if (tx->flags & IEEE80211_TX_PS_BUFFERED)
291
		return TX_CONTINUE;
292

J
Johannes Berg 已提交
293 294
	if (tx->sta)
		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
295

296
	if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
J
Johannes Berg 已提交
297
		if (unlikely(!assoc &&
298
			     ieee80211_is_data(hdr->frame_control))) {
299 300
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
			printk(KERN_DEBUG "%s: dropped data frame to not "
301
			       "associated station %pM\n",
302
			       tx->sdata->name, hdr->addr1);
303 304
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
			I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
305
			return TX_DROP;
306
		}
307 308 309 310 311 312 313 314
	} else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
			    ieee80211_is_data(hdr->frame_control) &&
			    !atomic_read(&tx->sdata->u.ap.num_sta_authorized))) {
		/*
		 * No associated STAs - no need to send multicast
		 * frames.
		 */
		return TX_DROP;
315 316
	}

317
	return TX_CONTINUE;
318 319 320 321 322 323 324 325 326 327 328 329 330
}

/* 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;

331 332 333 334 335 336
	/*
	 * virtual interfaces are protected by RCU
	 */
	rcu_read_lock();

	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
337
		struct ieee80211_if_ap *ap;
338
		if (sdata->vif.type != NL80211_IFTYPE_AP)
339 340 341 342 343 344 345 346 347 348
			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);
	}

349 350 351 352
	/*
	 * Drop one frame from each station from the lowest-priority
	 * AC that has frames at all.
	 */
353
	list_for_each_entry_rcu(sta, &local->sta_list, list) {
354 355 356 357 358 359 360 361 362 363
		int ac;

		for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
			skb = skb_dequeue(&sta->ps_tx_buf[ac]);
			total += skb_queue_len(&sta->ps_tx_buf[ac]);
			if (skb) {
				purged++;
				dev_kfree_skb(skb);
				break;
			}
364 365
		}
	}
366 367

	rcu_read_unlock();
368 369

	local->total_ps_buffered = total;
370
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
J
Joe Perches 已提交
371 372
	wiphy_debug(local->hw.wiphy, "PS buffers full - purged %d frames\n",
		    purged);
373
#endif
374 375
}

376
static ieee80211_tx_result
377
ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
378
{
379
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
380
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
381

382 383 384 385 386 387 388 389
	/*
	 * 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.
	 */

390 391 392 393 394
	/* powersaving STAs only in AP/VLAN mode */
	if (!tx->sdata->bss)
		return TX_CONTINUE;

	/* no buffering for ordered frames */
395
	if (ieee80211_has_order(hdr->frame_control))
396
		return TX_CONTINUE;
397 398 399

	/* no stations in PS mode */
	if (!atomic_read(&tx->sdata->bss->num_sta_ps))
400
		return TX_CONTINUE;
401

402
	info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
J
Johannes Berg 已提交
403

404 405
	/* device releases frame after DTIM beacon */
	if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
J
Johannes Berg 已提交
406 407
		return TX_CONTINUE;

408
	/* buffered in mac80211 */
J
Johannes Berg 已提交
409 410 411 412
	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) {
413
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
J
Johannes Berg 已提交
414 415
		if (net_ratelimit())
			printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n",
416
			       tx->sdata->name);
417
#endif
J
Johannes Berg 已提交
418 419 420
		dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
	} else
		tx->local->total_ps_buffered++;
421

J
Johannes Berg 已提交
422
	skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
423

J
Johannes Berg 已提交
424
	return TX_QUEUED;
425 426
}

427 428 429 430 431 432
static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
			     struct sk_buff *skb)
{
	if (!ieee80211_is_mgmt(fc))
		return 0;

J
Johannes Berg 已提交
433
	if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
434 435 436 437 438 439 440 441 442
		return 0;

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

	return 1;
}

443
static ieee80211_tx_result
444
ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
445 446
{
	struct sta_info *sta = tx->sta;
447
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
448
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
449
	struct ieee80211_local *local = tx->local;
450

451 452 453 454 455
	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)))
456
		return TX_CONTINUE;
457

J
Johannes Berg 已提交
458 459
	if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
		      test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
J
Johannes Berg 已提交
460
		     !(info->flags & IEEE80211_TX_CTL_POLL_RESPONSE))) {
461 462
		int ac = skb_get_queue_mapping(tx->skb);

463
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
464 465
		printk(KERN_DEBUG "STA %pM aid %d: PS buffer for AC %d\n",
		       sta->sta.addr, sta->sta.aid, ac);
466 467 468
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
		if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
			purge_old_ps_buffers(tx->local);
469 470
		if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
			struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
471
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
472 473 474 475
			if (net_ratelimit())
				printk(KERN_DEBUG "%s: STA %pM TX buffer for "
				       "AC %d full - dropping oldest frame\n",
				       tx->sdata->name, sta->sta.addr, ac);
476
#endif
477 478 479
			dev_kfree_skb(old);
		} else
			tx->local->total_ps_buffered++;
480

481
		info->control.jiffies = jiffies;
482
		info->control.vif = &tx->sdata->vif;
483
		info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
484
		skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
485 486 487 488 489 490

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

J
Johannes Berg 已提交
491 492 493 494 495 496
		/*
		 * We queued up some frames, so the TIM bit might
		 * need to be set, recalculate it.
		 */
		sta_info_recalc_tim(sta);

497
		return TX_QUEUED;
498 499
	}
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
J
Johannes Berg 已提交
500
	else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
J
Johannes Berg 已提交
501 502 503
		printk(KERN_DEBUG
		       "%s: STA %pM in PS mode, but polling/in SP -> send frame\n",
		       tx->sdata->name, sta->sta.addr);
504 505 506
	}
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */

507
	return TX_CONTINUE;
508 509
}

510
static ieee80211_tx_result debug_noinline
511
ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
512
{
513
	if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
514
		return TX_CONTINUE;
515

516
	if (tx->flags & IEEE80211_TX_UNICAST)
517 518 519 520 521
		return ieee80211_tx_h_unicast_ps_buf(tx);
	else
		return ieee80211_tx_h_multicast_ps_buf(tx);
}

522 523 524 525 526 527 528 529 530 531 532 533
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;
}

534
static ieee80211_tx_result debug_noinline
535
ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
536
{
537
	struct ieee80211_key *key = NULL;
538
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
539
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
540

J
Johannes Berg 已提交
541
	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
542
		tx->key = NULL;
543
	else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
544
		tx->key = key;
545
	else if (ieee80211_is_mgmt(hdr->frame_control) &&
546 547
		 is_multicast_ether_addr(hdr->addr1) &&
		 ieee80211_is_robust_mgmt_frame(hdr) &&
548 549
		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
		tx->key = key;
550 551 552 553 554
	else if (is_multicast_ether_addr(hdr->addr1) &&
		 (key = rcu_dereference(tx->sdata->default_multicast_key)))
		tx->key = key;
	else if (!is_multicast_ether_addr(hdr->addr1) &&
		 (key = rcu_dereference(tx->sdata->default_unicast_key)))
555
		tx->key = key;
556
	else if (tx->sdata->drop_unencrypted &&
557
		 (tx->skb->protocol != tx->sdata->control_port_protocol) &&
558 559 560
		 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
		 (!ieee80211_is_robust_mgmt_frame(hdr) ||
		  (ieee80211_is_action(hdr->frame_control) &&
J
Johannes Berg 已提交
561
		   tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))) {
562
		I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
563
		return TX_DROP;
564
	} else
565 566 567
		tx->key = NULL;

	if (tx->key) {
568 569
		bool skip_hw = false;

570
		tx->key->tx_rx_count++;
571
		/* TODO: add threshold stuff again */
572

573 574 575 576
		switch (tx->key->conf.cipher) {
		case WLAN_CIPHER_SUITE_WEP40:
		case WLAN_CIPHER_SUITE_WEP104:
		case WLAN_CIPHER_SUITE_TKIP:
577
			if (!ieee80211_is_data_present(hdr->frame_control))
578 579
				tx->key = NULL;
			break;
580
		case WLAN_CIPHER_SUITE_CCMP:
581 582 583 584
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
585 586 587 588
			else
				skip_hw = (tx->key->conf.flags &
					   IEEE80211_KEY_FLAG_SW_MGMT) &&
					ieee80211_is_mgmt(hdr->frame_control);
589
			break;
590
		case WLAN_CIPHER_SUITE_AES_CMAC:
591 592 593
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
594
		}
595

596 597 598
		if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED))
			return TX_DROP;

J
Johannes Berg 已提交
599
		if (!skip_hw && tx->key &&
J
Johannes Berg 已提交
600
		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
601
			info->control.hw_key = &tx->key->conf;
602 603
	}

604
	return TX_CONTINUE;
605 606
}

607
static ieee80211_tx_result debug_noinline
608
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
609
{
610
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
611 612 613
	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *rate;
S
Shanyu Zhao 已提交
614 615
	int i;
	u32 len;
616 617
	bool inval = false, rts = false, short_preamble = false;
	struct ieee80211_tx_rate_control txrc;
J
Johannes Berg 已提交
618
	bool assoc = false;
619

620
	memset(&txrc, 0, sizeof(txrc));
621

622
	sband = tx->local->hw.wiphy->bands[tx->channel->band];
623

S
Shanyu Zhao 已提交
624
	len = min_t(u32, tx->skb->len + FCS_LEN,
625
			 tx->local->hw.wiphy->frag_threshold);
626 627 628 629 630 631 632

	/* 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;
633 634 635 636 637
	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;
638
	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
639
		    tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
640
		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
641 642

	/* set up RTS protection if desired */
643
	if (len > tx->local->hw.wiphy->rts_threshold) {
644
		txrc.rts = rts = true;
645 646
	}

647 648 649 650 651 652 653 654
	/*
	 * 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) ||
J
Johannes Berg 已提交
655
	     (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
656
		txrc.short_preamble = short_preamble = true;
657

J
Johannes Berg 已提交
658 659
	if (tx->sta)
		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
660 661 662 663 664

	/*
	 * Lets not bother rate control if we're associated and cannot
	 * talk to the sta. This should not happen.
	 */
J
Johannes Berg 已提交
665
	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
666 667 668 669
		 !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",
670
		 tx->sdata->name, hdr->addr1,
671 672
		 tx->channel->band ? 5 : 2))
		return TX_DROP;
673

674 675 676 677
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
678 679 680 681 682
	rate_control_get_rate(tx->sdata, tx->sta, &txrc);

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

683
	if (txrc.reported_rate.idx < 0) {
684
		txrc.reported_rate = info->control.rates[0];
685 686 687
		if (tx->sta && ieee80211_is_data(hdr->frame_control))
			tx->sta->last_tx_rate = txrc.reported_rate;
	} else if (tx->sta)
688
		tx->sta->last_tx_rate = txrc.reported_rate;
689

690 691
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
692

693 694 695 696
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

697 698 699 700 701
	if (is_multicast_ether_addr(hdr->addr1)) {
		/*
		 * XXX: verify the rate is in the basic rateset
		 */
		return TX_CONTINUE;
702 703
	}

704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728
	/*
	 * 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;
729 730
	}

731 732 733 734 735 736 737 738 739 740 741 742 743 744
	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;
		}
745

746 747 748 749 750 751 752 753
		/*
		 * 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;
		}
754

755 756 757 758
		/* set up RTS protection if desired */
		if (rts)
			info->control.rates[i].flags |=
				IEEE80211_TX_RC_USE_RTS_CTS;
759

760
		/* RC is busted */
S
Sujith 已提交
761 762
		if (WARN_ON_ONCE(info->control.rates[i].idx >=
				 sband->n_bitrates)) {
763 764
			info->control.rates[i].idx = -1;
			continue;
765
		}
766

767 768 769 770 771 772 773 774 775 776 777 778 779
		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;
780 781
	}

782 783 784
	return TX_CONTINUE;
}

785 786 787 788 789 790 791 792 793
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;

794 795 796 797 798
	/*
	 * 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.
	 */
799
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
800 801
		return TX_CONTINUE;

802 803 804 805 806 807
	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
		return TX_CONTINUE;

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

808 809 810
	if (ieee80211_is_qos_nullfunc(hdr->frame_control))
		return TX_CONTINUE;

J
Johannes Berg 已提交
811 812 813 814 815
	/*
	 * Anything but QoS data that has a sequence number field
	 * (is long enough) gets a sequence number from the global
	 * counter.
	 */
816
	if (!ieee80211_is_data_qos(hdr->frame_control)) {
J
Johannes Berg 已提交
817
		/* driver should assign sequence number */
818
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
J
Johannes Berg 已提交
819 820 821
		/* 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;
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
		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;
}

847
static int ieee80211_fragment(struct ieee80211_tx_data *tx,
J
Johannes Berg 已提交
848 849 850
			      struct sk_buff *skb, int hdrlen,
			      int frag_threshold)
{
851
	struct ieee80211_local *local = tx->local;
852
	struct ieee80211_tx_info *info;
853
	struct sk_buff *tmp;
J
Johannes Berg 已提交
854 855 856 857 858 859 860
	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;

861 862
	/* first fragment was already added to queue by caller */

J
Johannes Berg 已提交
863 864 865 866 867 868 869 870 871 872 873 874
	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;
875 876 877

		__skb_queue_tail(&tx->skbs, tmp);

J
Johannes Berg 已提交
878 879 880 881
		skb_reserve(tmp, local->tx_headroom +
				 IEEE80211_ENCRYPT_HEADROOM);
		/* copy control information */
		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
882 883 884 885 886 887 888 889

		info = IEEE80211_SKB_CB(tmp);
		info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
				 IEEE80211_TX_CTL_FIRST_FRAGMENT);

		if (rem)
			info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;

J
Johannes Berg 已提交
890 891 892 893 894 895 896 897 898 899 900
		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;
	}

901
	/* adjust first fragment's length */
J
Johannes Berg 已提交
902 903 904 905
	skb->len = hdrlen + per_fragm;
	return 0;
}

906
static ieee80211_tx_result debug_noinline
907 908
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
J
Johannes Berg 已提交
909 910 911
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
912
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
J
Johannes Berg 已提交
913 914
	int hdrlen;
	int fragnum;
915

916 917 918 919
	/* no matter what happens, tx->skb moves to tx->skbs */
	__skb_queue_tail(&tx->skbs, skb);
	tx->skb = NULL;

920 921 922 923
	if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
		return TX_CONTINUE;

	if (tx->local->ops->set_frag_threshold)
924 925
		return TX_CONTINUE;

926 927
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
J
Johannes Berg 已提交
928
	 * This scenario is handled in ieee80211_tx_prepare but extra
929
	 * caution taken here as fragmented ampdu may cause Tx stop.
930
	 */
S
Sujith 已提交
931
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
932 933
		return TX_DROP;

934
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
935

936
	/* internal error, why isn't DONTFRAG set? */
937
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
J
Johannes Berg 已提交
938
		return TX_DROP;
939

J
Johannes Berg 已提交
940 941 942 943 944 945 946 947
	/*
	 * 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.
	 */
948
	if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
J
Johannes Berg 已提交
949
		return TX_DROP;
950

J
Johannes Berg 已提交
951 952
	/* update duration/seq/flags of fragments */
	fragnum = 0;
953 954

	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
955 956
		int next_len;
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
957

J
Johannes Berg 已提交
958 959
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
960

961
		if (!skb_queue_is_last(&tx->skbs, skb)) {
J
Johannes Berg 已提交
962
			hdr->frame_control |= morefrags;
963 964 965 966 967 968 969 970 971 972
			/*
			 * 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
973 974 975
		} else {
			hdr->frame_control &= ~morefrags;
			next_len = 0;
976
		}
J
Johannes Berg 已提交
977 978
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
979
	}
980

981
	return TX_CONTINUE;
982 983
}

984 985 986
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
{
987
	struct sk_buff *skb;
988 989 990 991 992

	if (!tx->sta)
		return TX_CONTINUE;

	tx->sta->tx_packets++;
993
	skb_queue_walk(&tx->skbs, skb) {
994 995
		tx->sta->tx_fragments++;
		tx->sta->tx_bytes += skb->len;
996
	}
997 998 999 1000

	return TX_CONTINUE;
}

1001
static ieee80211_tx_result debug_noinline
1002 1003 1004 1005 1006
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
	if (!tx->key)
		return TX_CONTINUE;

1007 1008 1009
	switch (tx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
1010
		return ieee80211_crypto_wep_encrypt(tx);
1011
	case WLAN_CIPHER_SUITE_TKIP:
1012
		return ieee80211_crypto_tkip_encrypt(tx);
1013
	case WLAN_CIPHER_SUITE_CCMP:
1014
		return ieee80211_crypto_ccmp_encrypt(tx);
1015
	case WLAN_CIPHER_SUITE_AES_CMAC:
1016
		return ieee80211_crypto_aes_cmac_encrypt(tx);
1017
	default:
1018
		return ieee80211_crypto_hw_encrypt(tx);
1019 1020 1021 1022 1023
	}

	return TX_DROP;
}

1024
static ieee80211_tx_result debug_noinline
J
Johannes Berg 已提交
1025 1026
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
1027
	struct sk_buff *skb;
J
Johannes Berg 已提交
1028 1029 1030
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
J
Johannes Berg 已提交
1031

1032
	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
1033
		hdr = (void *) skb->data;
1034 1035
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
1036 1037 1038 1039 1040
		if (!skb_queue_is_last(&tx->skbs, skb)) {
			struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
			next_len = next->len;
		} else
			next_len = 0;
J
Johannes Berg 已提交
1041
		group_addr = is_multicast_ether_addr(hdr->addr1);
J
Johannes Berg 已提交
1042

J
Johannes Berg 已提交
1043
		hdr->duration_id =
1044 1045
			ieee80211_duration(tx, skb, group_addr, next_len);
	}
J
Johannes Berg 已提交
1046 1047 1048 1049

	return TX_CONTINUE;
}

1050 1051
/* actual transmit path */

1052 1053 1054 1055 1056 1057 1058
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;
1059
	bool reset_agg_timer = false;
1060 1061 1062

	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
		info->flags |= IEEE80211_TX_CTL_AMPDU;
1063
		reset_agg_timer = true;
1064 1065 1066 1067 1068
	} 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
		 */
1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088
	} 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.
		 */
J
Johannes Berg 已提交
1089
		tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1090 1091 1092 1093 1094

		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;
1095
			reset_agg_timer = true;
1096 1097 1098 1099 1100 1101 1102 1103 1104
		} 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);
	}

1105 1106 1107 1108 1109
	/* reset session timer */
	if (reset_agg_timer && tid_tx->timeout)
		mod_timer(&tid_tx->session_timer,
			  TU_TO_EXP_TIME(tid_tx->timeout));

1110 1111 1112
	return queued;
}

1113 1114 1115
/*
 * initialises @tx
 */
1116
static ieee80211_tx_result
J
Johannes Berg 已提交
1117 1118 1119
ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
		     struct sk_buff *skb)
1120
{
J
Johannes Berg 已提交
1121
	struct ieee80211_local *local = sdata->local;
1122
	struct ieee80211_hdr *hdr;
1123
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
1124
	int tid;
1125
	u8 *qc;
1126 1127 1128 1129

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
J
Johannes Berg 已提交
1130
	tx->sdata = sdata;
1131
	tx->channel = local->hw.conf.channel;
1132
	__skb_queue_head_init(&tx->skbs);
1133

1134 1135 1136 1137 1138 1139 1140
	/*
	 * 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;

1141 1142
	hdr = (struct ieee80211_hdr *) skb->data;

1143
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1144
		tx->sta = rcu_dereference(sdata->u.vlan.sta);
1145 1146
		if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
			return TX_DROP;
1147 1148
	} else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
		tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1149
	}
1150
	if (!tx->sta)
1151
		tx->sta = sta_info_get(sdata, hdr->addr1);
1152

1153
	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1154
	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1155 1156
	    (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
	    !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1157 1158
		struct tid_ampdu_tx *tid_tx;

S
Sujith 已提交
1159 1160 1161
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1162 1163 1164
		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
		if (tid_tx) {
			bool queued;
1165

1166 1167 1168 1169 1170 1171
			queued = ieee80211_tx_prep_agg(tx, skb, info,
						       tid_tx, tid);

			if (unlikely(queued))
				return TX_QUEUED;
		}
S
Sujith 已提交
1172 1173
	}

1174
	if (is_multicast_ether_addr(hdr->addr1)) {
1175
		tx->flags &= ~IEEE80211_TX_UNICAST;
1176
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1177
	} else
1178
		tx->flags |= IEEE80211_TX_UNICAST;
1179

1180 1181 1182 1183 1184
	if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
		if (!(tx->flags & IEEE80211_TX_UNICAST) ||
		    skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
		    info->flags & IEEE80211_TX_CTL_AMPDU)
			info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1185 1186
	}

1187
	if (!tx->sta)
1188
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
J
Johannes Berg 已提交
1189
	else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1190
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1191

1192
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1193

1194
	return TX_CONTINUE;
1195 1196
}

1197 1198 1199 1200 1201
static bool ieee80211_tx_frags(struct ieee80211_local *local,
			       struct ieee80211_vif *vif,
			       struct ieee80211_sta *sta,
			       struct sk_buff_head *skbs,
			       bool txpending)
1202
{
1203
	struct sk_buff *skb, *tmp;
1204
	struct ieee80211_tx_info *info;
J
Johannes Berg 已提交
1205
	unsigned long flags;
1206

1207
	skb_queue_walk_safe(skbs, skb, tmp) {
J
Johannes Berg 已提交
1208 1209 1210 1211
		int q = skb_get_queue_mapping(skb);

		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		if (local->queue_stop_reasons[q] ||
1212 1213 1214 1215 1216 1217
		    (!txpending && !skb_queue_empty(&local->pending[q]))) {
			/*
			 * Since queue is stopped, queue up frames for later
			 * transmission from the tx-pending tasklet when the
			 * queue is woken again.
			 */
1218
			if (txpending)
J
Johannes Berg 已提交
1219
				skb_queue_splice_init(skbs, &local->pending[q]);
1220
			else
J
Johannes Berg 已提交
1221 1222
				skb_queue_splice_tail_init(skbs,
							   &local->pending[q]);
1223 1224 1225 1226 1227

			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);
			return false;
		}
J
Johannes Berg 已提交
1228
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1229

1230
		info = IEEE80211_SKB_CB(skb);
1231 1232
		info->control.vif = vif;
		info->control.sta = sta;
1233

1234 1235 1236
		__skb_unlink(skb, skbs);
		drv_tx(local, skb);
	}
1237

1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254
	return true;
}

/*
 * Returns false if the frame couldn't be transmitted but was queued instead.
 */
static bool __ieee80211_tx(struct ieee80211_local *local,
			   struct sk_buff_head *skbs, int led_len,
			   struct sta_info *sta, bool txpending)
{
	struct ieee80211_tx_info *info;
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_vif *vif;
	struct ieee80211_sta *pubsta;
	struct sk_buff *skb;
	bool result = true;
	__le16 fc;
1255

1256 1257
	if (WARN_ON(skb_queue_empty(skbs)))
		return true;
J
Johannes Berg 已提交
1258

1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282
	skb = skb_peek(skbs);
	fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
	info = IEEE80211_SKB_CB(skb);
	sdata = vif_to_sdata(info->control.vif);
	if (sta && !sta->uploaded)
		sta = NULL;

	if (sta)
		pubsta = &sta->sta;
	else
		pubsta = NULL;

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_MONITOR:
		sdata = NULL;
		vif = NULL;
		break;
	case NL80211_IFTYPE_AP_VLAN:
		sdata = container_of(sdata->bss,
				     struct ieee80211_sub_if_data, u.ap);
		/* fall through */
	default:
		vif = &sdata->vif;
		break;
1283
	}
J
Johannes Berg 已提交
1284

1285 1286 1287 1288 1289 1290
	if (local->ops->tx_frags)
		drv_tx_frags(local, vif, pubsta, skbs);
	else
		result = ieee80211_tx_frags(local, vif, pubsta, skbs,
					    txpending);

1291 1292 1293
	ieee80211_tpt_led_trig_tx(local, fc, led_len);
	ieee80211_led_tx(local, 1);

J
Johannes Berg 已提交
1294
	WARN_ON_ONCE(!skb_queue_empty(skbs));
1295

1296
	return result;
1297 1298
}

1299 1300 1301 1302 1303 1304
/*
 * 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)
{
1305
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1306 1307
	ieee80211_tx_result res = TX_DROP;

1308 1309 1310 1311 1312 1313 1314
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1315
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1316 1317
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
1318
	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1319
	CALL_TXH(ieee80211_tx_h_select_key);
1320 1321
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1322

J
Johannes Berg 已提交
1323 1324 1325
	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
		__skb_queue_tail(&tx->skbs, tx->skb);
		tx->skb = NULL;
1326
		goto txh_done;
J
Johannes Berg 已提交
1327
	}
1328 1329

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1330 1331
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1332
	/* handlers after fragment must be aware of tx info fragmentation! */
1333 1334
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
1335 1336
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_calculate_duration);
1337
#undef CALL_TXH
1338

1339
 txh_done:
1340
	if (unlikely(res == TX_DROP)) {
1341
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1342 1343 1344 1345
		if (tx->skb)
			dev_kfree_skb(tx->skb);
		else
			__skb_queue_purge(&tx->skbs);
1346 1347
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1348
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1349 1350 1351 1352 1353 1354
		return -1;
	}

	return 0;
}

1355 1356 1357 1358
/*
 * Returns false if the frame couldn't be transmitted but was queued instead.
 */
static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
1359
			 struct sk_buff *skb, bool txpending)
1360
{
J
Johannes Berg 已提交
1361
	struct ieee80211_local *local = sdata->local;
1362
	struct ieee80211_tx_data tx;
1363
	ieee80211_tx_result res_prepare;
1364
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1365
	bool result = true;
1366
	int led_len;
1367 1368 1369

	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1370
		return true;
1371 1372
	}

1373 1374
	rcu_read_lock();

1375
	/* initialises tx */
1376
	led_len = skb->len;
J
Johannes Berg 已提交
1377
	res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1378

1379
	if (unlikely(res_prepare == TX_DROP)) {
1380
		dev_kfree_skb(skb);
1381
		goto out;
1382
	} else if (unlikely(res_prepare == TX_QUEUED)) {
1383
		goto out;
1384 1385
	}

1386
	tx.channel = local->hw.conf.channel;
1387
	info->band = tx.channel->band;
1388

1389
	if (!invoke_tx_handlers(&tx))
1390 1391
		result = __ieee80211_tx(local, &tx.skbs, led_len,
					tx.sta, txpending);
1392
 out:
1393
	rcu_read_unlock();
1394
	return result;
1395 1396 1397 1398
}

/* device xmit handlers */

1399
static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1400 1401 1402
				struct sk_buff *skb,
				int head_need, bool may_encrypt)
{
1403
	struct ieee80211_local *local = sdata->local;
1404 1405
	int tail_need = 0;

1406
	if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1407 1408 1409 1410 1411
		tail_need = IEEE80211_ENCRYPT_TAILROOM;
		tail_need -= skb_tailroom(skb);
		tail_need = max_t(int, tail_need, 0);
	}

1412
	if (skb_cloned(skb))
1413
		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1414
	else if (head_need || tail_need)
1415
		I802_DEBUG_INC(local->tx_expand_skb_head);
1416 1417
	else
		return 0;
1418 1419

	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
J
Joe Perches 已提交
1420 1421
		wiphy_debug(local->hw.wiphy,
			    "failed to reallocate TX buffer\n");
1422 1423 1424 1425 1426 1427
		return -ENOMEM;
	}

	return 0;
}

1428
void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
1429
{
J
Johannes Berg 已提交
1430
	struct ieee80211_local *local = sdata->local;
1431
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1432
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1433
	int headroom;
1434
	bool may_encrypt;
1435

1436 1437
	rcu_read_lock();

J
Johannes Berg 已提交
1438
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1439

J
Johannes Berg 已提交
1440
	headroom = local->tx_headroom;
1441 1442 1443 1444 1445
	if (may_encrypt)
		headroom += IEEE80211_ENCRYPT_HEADROOM;
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

1446
	if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1447
		dev_kfree_skb(skb);
1448
		rcu_read_unlock();
J
Johannes Berg 已提交
1449
		return;
1450 1451
	}

1452
	hdr = (struct ieee80211_hdr *) skb->data;
1453
	info->control.vif = &sdata->vif;
1454

1455 1456 1457
	if (ieee80211_vif_is_mesh(&sdata->vif) &&
	    ieee80211_is_data(hdr->frame_control) &&
		!is_multicast_ether_addr(hdr->addr1))
1458
			if (mesh_nexthop_resolve(skb, sdata)) {
1459
				/* skb queued: don't free */
1460
				rcu_read_unlock();
1461 1462 1463
				return;
			}

1464
	ieee80211_set_qos_hdr(sdata, skb);
J
Johannes Berg 已提交
1465
	ieee80211_tx(sdata, skb, false);
1466
	rcu_read_unlock();
1467 1468
}

1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 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 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551
static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
{
	struct ieee80211_radiotap_iterator iterator;
	struct ieee80211_radiotap_header *rthdr =
		(struct ieee80211_radiotap_header *) skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
						   NULL);
	u16 txflags;

	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
		       IEEE80211_TX_CTL_DONTFRAG;

	/*
	 * 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
				 */
				if (skb->len < (iterator._max_length + FCS_LEN))
					return false;

				skb_trim(skb, skb->len - FCS_LEN);
			}
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
				info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
				info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
			break;

		case IEEE80211_RADIOTAP_TX_FLAGS:
			txflags = get_unaligned_le16(iterator.this_arg);
			if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
				info->flags |= IEEE80211_TX_CTL_NO_ACK;
			break;

		/*
		 * Please update the file
		 * Documentation/networking/mac80211-injection.txt
		 * when parsing new fields here.
		 */

		default:
			break;
		}
	}

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

	/*
	 * remove the radiotap header
	 * iterator->_max_length was sanity-checked against
	 * skb->len by iterator init
	 */
	skb_pull(skb, iterator._max_length);

	return true;
}

1552 1553
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1554 1555
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1556
	struct ieee80211_channel *chan = local->hw.conf.channel;
1557 1558
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1559
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1560
	struct ieee80211_hdr *hdr;
J
Johannes Berg 已提交
1561
	struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1562
	u16 len_rthdr;
J
Johannes Berg 已提交
1563
	int hdrlen;
1564

1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584
	/*
	 * 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;

1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598
	/* 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 */
1599 1600 1601 1602 1603 1604 1605

	/*
	 * 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
	 */
1606
	skb_set_mac_header(skb, len_rthdr);
1607
	/*
1608 1609
	 * 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
1610
	 */
1611 1612
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1613

J
Johannes Berg 已提交
1614 1615 1616 1617 1618 1619 1620 1621 1622
	if (skb->len < len_rthdr + 2)
		goto fail;

	hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
	hdrlen = ieee80211_hdrlen(hdr->frame_control);

	if (skb->len < len_rthdr + hdrlen)
		goto fail;

1623 1624 1625 1626
	/*
	 * Initialize skb->protocol if the injected frame is a data frame
	 * carrying a rfc1042 header
	 */
J
Johannes Berg 已提交
1627 1628 1629 1630 1631 1632 1633
	if (ieee80211_is_data(hdr->frame_control) &&
	    skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
		u8 *payload = (u8 *)hdr + hdrlen;

		if (compare_ether_addr(payload, rfc1042_header) == 0)
			skb->protocol = cpu_to_be16((payload[6] << 8) |
						    payload[7]);
1634 1635
	}

J
Johannes Berg 已提交
1636 1637
	memset(info, 0, sizeof(*info));

J
Johannes Berg 已提交
1638
	info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1639 1640 1641 1642 1643
		      IEEE80211_TX_CTL_INJECTED;

	/* process and remove the injection radiotap header */
	if (!ieee80211_parse_tx_radiotap(skb))
		goto fail;
J
Johannes Berg 已提交
1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668

	rcu_read_lock();

	/*
	 * We process outgoing injected frames that have a local address
	 * we handle as though they are non-injected frames.
	 * This code here isn't entirely correct, the local MAC address
	 * isn't always enough to find the interface to use; for proper
	 * VLAN/WDS support we will need a different mechanism (which
	 * likely isn't going to be monitor interfaces).
	 */
	sdata = IEEE80211_DEV_TO_SUB_IF(dev);

	list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
		if (!ieee80211_sdata_running(tmp_sdata))
			continue;
		if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
		    tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
		    tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
			continue;
		if (compare_ether_addr(tmp_sdata->vif.addr, hdr->addr2) == 0) {
			sdata = tmp_sdata;
			break;
		}
	}
1669

J
Johannes Berg 已提交
1670 1671 1672
	ieee80211_xmit(sdata, skb);
	rcu_read_unlock();

1673
	return NETDEV_TX_OK;
1674 1675 1676 1677

fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694
}

/**
 * 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).
 */
1695 1696
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
				    struct net_device *dev)
1697
{
1698 1699
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
1700
	struct ieee80211_tx_info *info;
1701
	int ret = NETDEV_TX_BUSY, head_need;
1702 1703
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
1704
	struct ieee80211_hdr hdr;
1705
	struct ieee80211s_hdr mesh_hdr __maybe_unused;
1706
	struct mesh_path __maybe_unused *mppath = NULL;
1707 1708
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
1709
	int nh_pos, h_pos;
1710
	struct sta_info *sta = NULL;
J
Johannes Berg 已提交
1711
	bool wme_sta = false, authorized = false, tdls_auth = false;
1712
	bool tdls_direct = false;
J
Johannes Berg 已提交
1713 1714 1715
	bool multicast;
	u32 info_flags = 0;
	u16 info_id = 0;
1716 1717

	if (unlikely(skb->len < ETH_HLEN)) {
1718
		ret = NETDEV_TX_OK;
1719 1720 1721 1722 1723 1724
		goto fail;
	}

	/* convert Ethernet header to proper 802.11 header (based on
	 * operation mode) */
	ethertype = (skb->data[12] << 8) | skb->data[13];
1725
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1726

1727
	switch (sdata->vif.type) {
1728
	case NL80211_IFTYPE_AP_VLAN:
1729
		rcu_read_lock();
1730
		sta = rcu_dereference(sdata->u.vlan.sta);
1731 1732 1733 1734
		if (sta) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1735
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1736 1737 1738
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
			hdrlen = 30;
J
Johannes Berg 已提交
1739 1740
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
			wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1741 1742 1743 1744 1745 1746
		}
		rcu_read_unlock();
		if (sta)
			break;
		/* fall through */
	case NL80211_IFTYPE_AP:
1747
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1748 1749
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
1750
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1751 1752
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
1753
		break;
1754
	case NL80211_IFTYPE_WDS:
1755
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1756 1757
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1758
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1759 1760 1761
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
1762
		break;
1763
#ifdef CONFIG_MAC80211_MESH
1764
	case NL80211_IFTYPE_MESH_POINT:
1765
		if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1766
			/* Do not send frames with mesh_ttl == 0 */
1767
			sdata->u.mesh.mshstats.dropped_frames_ttl++;
1768
			ret = NETDEV_TX_OK;
1769
			goto fail;
1770
		}
1771
		rcu_read_lock();
1772 1773
		if (!is_multicast_ether_addr(skb->data))
			mppath = mpp_path_lookup(skb->data, sdata);
1774

1775
		/*
1776 1777 1778 1779
		 * Use address extension if it is a packet from
		 * another interface or if we know the destination
		 * is being proxied by a portal (i.e. portal address
		 * differs from proxied address)
1780
		 */
1781
		if (compare_ether_addr(sdata->vif.addr,
1782
				       skb->data + ETH_ALEN) == 0 &&
1783
		    !(mppath && compare_ether_addr(mppath->mpp, skb->data))) {
1784 1785
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
1786
			rcu_read_unlock();
1787
			meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1788
					sdata, NULL, NULL);
1789
		} else {
1790
			int is_mesh_mcast = 1;
1791
			const u8 *mesh_da;
1792 1793

			if (is_multicast_ether_addr(skb->data))
1794 1795
				/* DA TA mSA AE:SA */
				mesh_da = skb->data;
1796
			else {
1797 1798
				static const u8 bcast[ETH_ALEN] =
					{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1799 1800 1801 1802
				if (mppath) {
					/* RA TA mDA mSA AE:DA SA */
					mesh_da = mppath->mpp;
					is_mesh_mcast = 0;
1803
				} else {
1804
					/* DA TA mSA AE:SA */
1805 1806
					mesh_da = bcast;
				}
1807
			}
1808
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1809
					mesh_da, sdata->vif.addr);
1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822
			rcu_read_unlock();
			if (is_mesh_mcast)
				meshhdrlen =
					ieee80211_new_mesh_header(&mesh_hdr,
							sdata,
							skb->data + ETH_ALEN,
							NULL);
			else
				meshhdrlen =
					ieee80211_new_mesh_header(&mesh_hdr,
							sdata,
							skb->data,
							skb->data + ETH_ALEN);
1823 1824

		}
1825 1826
		break;
#endif
1827
	case NL80211_IFTYPE_STATION:
1828
		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
J
Johannes Berg 已提交
1829 1830
			bool tdls_peer = false;

1831 1832
			rcu_read_lock();
			sta = sta_info_get(sdata, skb->data);
J
Johannes Berg 已提交
1833 1834 1835 1836 1837 1838 1839 1840 1841
			if (sta) {
				authorized = test_sta_flag(sta,
							WLAN_STA_AUTHORIZED);
				wme_sta = test_sta_flag(sta, WLAN_STA_WME);
				tdls_peer = test_sta_flag(sta,
							 WLAN_STA_TDLS_PEER);
				tdls_auth = test_sta_flag(sta,
						WLAN_STA_TDLS_PEER_AUTH);
			}
1842 1843 1844 1845 1846 1847 1848
			rcu_read_unlock();

			/*
			 * If the TDLS link is enabled, send everything
			 * directly. Otherwise, allow TDLS setup frames
			 * to be transmitted indirectly.
			 */
J
Johannes Berg 已提交
1849
			tdls_direct = tdls_peer && (tdls_auth ||
1850 1851 1852 1853 1854 1855
				 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
				   skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
		}

		if (tdls_direct) {
			/* link during setup - throw out frames to peer */
J
Johannes Berg 已提交
1856
			if (!tdls_auth) {
1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869
				ret = NETDEV_TX_OK;
				goto fail;
			}

			/* DA SA BSSID */
			memcpy(hdr.addr1, skb->data, ETH_ALEN);
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
			hdrlen = 24;
		}  else if (sdata->u.mgd.use_4addr &&
			    cpu_to_be16(ethertype) != sdata->control_port_protocol) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
					  IEEE80211_FCTL_TODS);
1870
			/* RA TA DA SA */
1871
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1872
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1873 1874 1875 1876 1877 1878
			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 */
1879
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1880 1881 1882 1883
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			hdrlen = 24;
		}
1884
		break;
1885
	case NL80211_IFTYPE_ADHOC:
1886 1887 1888
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1889
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1890
		hdrlen = 24;
1891 1892
		break;
	default:
1893
		ret = NETDEV_TX_OK;
1894 1895 1896
		goto fail;
	}

1897 1898 1899 1900 1901
	/*
	 * There's no need to try to look up the destination
	 * if it is a multicast address (which can only happen
	 * in AP mode)
	 */
J
Johannes Berg 已提交
1902 1903
	multicast = is_multicast_ether_addr(hdr.addr1);
	if (!multicast) {
1904
		rcu_read_lock();
1905
		sta = sta_info_get(sdata, hdr.addr1);
J
Johannes Berg 已提交
1906 1907 1908 1909
		if (sta) {
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
			wme_sta = test_sta_flag(sta, WLAN_STA_WME);
		}
1910
		rcu_read_unlock();
1911 1912
	}

1913 1914
	/* For mesh, the use of the QoS header is mandatory */
	if (ieee80211_vif_is_mesh(&sdata->vif))
J
Johannes Berg 已提交
1915
		wme_sta = true;
1916

1917
	/* receiver and we are QoS enabled, use a QoS type frame */
J
Johannes Berg 已提交
1918
	if (wme_sta && local->hw.queues >= 4) {
1919
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1920 1921 1922 1923
		hdrlen += 2;
	}

	/*
1924 1925
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
1926
	 */
1927 1928 1929 1930
	if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
		     !is_multicast_ether_addr(hdr.addr1) && !authorized &&
		     (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
		      compare_ether_addr(sdata->vif.addr, skb->data + ETH_ALEN)))) {
1931 1932
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (net_ratelimit())
1933
			printk(KERN_DEBUG "%s: dropped frame to %pM"
1934
			       " (unauthorized port)\n", dev->name,
1935
			       hdr.addr1);
1936 1937 1938 1939
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

1940
		ret = NETDEV_TX_OK;
1941 1942 1943
		goto fail;
	}

J
Johannes Berg 已提交
1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982
	if (unlikely(!multicast && skb->sk &&
		     skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
		struct sk_buff *orig_skb = skb;

		skb = skb_clone(skb, GFP_ATOMIC);
		if (skb) {
			unsigned long flags;
			int id, r;

			spin_lock_irqsave(&local->ack_status_lock, flags);
			r = idr_get_new_above(&local->ack_status_frames,
					      orig_skb, 1, &id);
			if (r == -EAGAIN) {
				idr_pre_get(&local->ack_status_frames,
					    GFP_ATOMIC);
				r = idr_get_new_above(&local->ack_status_frames,
						      orig_skb, 1, &id);
			}
			if (WARN_ON(!id) || id > 0xffff) {
				idr_remove(&local->ack_status_frames, id);
				r = -ERANGE;
			}
			spin_unlock_irqrestore(&local->ack_status_lock, flags);

			if (!r) {
				info_id = id;
				info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
			} else if (skb_shared(skb)) {
				kfree_skb(orig_skb);
			} else {
				kfree_skb(skb);
				skb = orig_skb;
			}
		} else {
			/* couldn't clone -- lose tx status ... */
			skb = orig_skb;
		}
	}

1983 1984 1985 1986
	/*
	 * If the skb is shared we need to obtain our own copy.
	 */
	if (skb_shared(skb)) {
J
Johannes Berg 已提交
1987 1988 1989 1990 1991
		struct sk_buff *tmp_skb = skb;

		/* can't happen -- skb is a clone if info_id != 0 */
		WARN_ON(info_id);

1992
		skb = skb_clone(skb, GFP_ATOMIC);
1993 1994 1995 1996 1997 1998 1999 2000
		kfree_skb(tmp_skb);

		if (!skb) {
			ret = NETDEV_TX_OK;
			goto fail;
		}
	}

2001
	hdr.frame_control = fc;
2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018
	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;
	}

2019 2020 2021
	nh_pos = skb_network_header(skb) - skb->data;
	h_pos = skb_transport_header(skb) - skb->data;

2022 2023 2024 2025
	skb_pull(skb, skip_header_bytes);
	nh_pos -= skip_header_bytes;
	h_pos -= skip_header_bytes;

2026
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2027

2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038
	/*
	 * 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.
	 */
2039

2040
	if (head_need > 0 || skb_cloned(skb)) {
2041 2042 2043
		head_need += IEEE80211_ENCRYPT_HEADROOM;
		head_need += local->tx_headroom;
		head_need = max_t(int, 0, head_need);
2044
		if (ieee80211_skb_resize(sdata, skb, head_need, true))
2045 2046 2047 2048 2049 2050 2051 2052
			goto fail;
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
2053

2054
#ifdef CONFIG_MAC80211_MESH
2055 2056 2057 2058 2059
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}
2060
#endif
2061

2062
	if (ieee80211_is_data_qos(fc)) {
2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074
		__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);

2075 2076 2077
	nh_pos += hdrlen;
	h_pos += hdrlen;

2078 2079
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
2080 2081 2082 2083 2084 2085 2086 2087

	/* 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);

2088
	info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
2089 2090
	memset(info, 0, sizeof(*info));

2091
	dev->trans_start = jiffies;
J
Johannes Berg 已提交
2092 2093 2094 2095

	info->flags = info_flags;
	info->ack_frame_id = info_id;

J
Johannes Berg 已提交
2096
	ieee80211_xmit(sdata, skb);
2097

2098
	return NETDEV_TX_OK;
2099 2100

 fail:
2101
	if (ret == NETDEV_TX_OK)
2102 2103 2104 2105 2106 2107
		dev_kfree_skb(skb);

	return ret;
}


2108 2109 2110 2111
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
2112 2113
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
J
Johannes Berg 已提交
2114
	int i;
2115

2116 2117
	for (i = 0; i < local->hw.queues; i++)
		skb_queue_purge(&local->pending[i]);
2118 2119
}

2120 2121 2122 2123 2124
/*
 * Returns false if the frame couldn't be transmitted but was queued instead,
 * which in this case means re-queued -- take as an indication to stop sending
 * more pending frames.
 */
2125 2126 2127 2128 2129 2130 2131
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;
2132
	bool result;
2133

2134
	sdata = vif_to_sdata(info->control.vif);
2135 2136

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2137
		result = ieee80211_tx(sdata, skb, true);
2138
	} else {
2139 2140 2141 2142 2143
		struct sk_buff_head skbs;

		__skb_queue_head_init(&skbs);
		__skb_queue_tail(&skbs, skb);

2144
		hdr = (struct ieee80211_hdr *)skb->data;
2145
		sta = sta_info_get(sdata, hdr->addr1);
2146

2147
		result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2148 2149 2150 2151 2152
	}

	return result;
}

2153
/*
J
Johannes Berg 已提交
2154
 * Transmit all pending packets. Called from tasklet.
2155
 */
2156 2157 2158
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
2159
	struct ieee80211_sub_if_data *sdata;
2160
	unsigned long flags;
2161
	int i;
J
Johannes Berg 已提交
2162
	bool txok;
2163

2164
	rcu_read_lock();
2165

J
Johannes Berg 已提交
2166
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2167 2168 2169 2170 2171
	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
2172
		if (local->queue_stop_reasons[i] ||
2173
		    skb_queue_empty(&local->pending[i]))
2174
			continue;
2175

2176
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
2177
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2178 2179
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

2180 2181 2182 2183 2184
			if (WARN_ON(!info->control.vif)) {
				kfree_skb(skb);
				continue;
			}

J
Johannes Berg 已提交
2185 2186 2187 2188 2189 2190 2191
			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
						flags);

			txok = ieee80211_tx_pending_skb(local, skb);
			spin_lock_irqsave(&local->queue_stop_reason_lock,
					  flags);
			if (!txok)
2192
				break;
2193
		}
2194 2195 2196

		if (skb_queue_empty(&local->pending[i]))
			list_for_each_entry_rcu(sdata, &local->interfaces, list)
J
Johannes Berg 已提交
2197
				netif_wake_subqueue(sdata->dev, i);
2198
	}
J
Johannes Berg 已提交
2199
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2200

2201
	rcu_read_unlock();
2202 2203 2204 2205
}

/* functions for drivers to get certain frames */

R
Rami Rosen 已提交
2206
static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
2207 2208
				     struct sk_buff *skb,
				     struct beacon_data *beacon)
2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222
{
	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)
2223
		bss->dtim_count = beacon->dtim_period - 1;
2224 2225 2226 2227 2228 2229 2230
	else
		bss->dtim_count--;

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
	*pos++ = bss->dtim_count;
2231
	*pos++ = beacon->dtim_period;
2232 2233 2234 2235

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

2236 2237
	bss->dtim_bc_mc = aid0 == 1;

2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259
	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 */
2260
		skb_put(skb, n2 - n1);
2261 2262 2263 2264 2265 2266 2267 2268 2269
		memcpy(pos, bss->tim + n1, n2 - n1 + 1);

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

2270 2271 2272
struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
					 struct ieee80211_vif *vif,
					 u16 *tim_offset, u16 *tim_length)
2273 2274
{
	struct ieee80211_local *local = hw_to_local(hw);
2275
	struct sk_buff *skb = NULL;
2276
	struct ieee80211_tx_info *info;
2277 2278
	struct ieee80211_sub_if_data *sdata = NULL;
	struct ieee80211_if_ap *ap = NULL;
2279
	struct beacon_data *beacon;
2280
	struct ieee80211_supported_band *sband;
2281
	enum ieee80211_band band = local->hw.conf.channel->band;
2282
	struct ieee80211_tx_rate_control txrc;
2283

2284
	sband = local->hw.wiphy->bands[band];
2285 2286

	rcu_read_lock();
2287

2288
	sdata = vif_to_sdata(vif);
2289

2290 2291 2292
	if (!ieee80211_sdata_running(sdata))
		goto out;

2293 2294 2295 2296 2297
	if (tim_offset)
		*tim_offset = 0;
	if (tim_length)
		*tim_length = 0;

2298
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
2299 2300
		ap = &sdata->u.ap;
		beacon = rcu_dereference(ap->beacon);
D
Dan Carpenter 已提交
2301
		if (beacon) {
J
Johannes Berg 已提交
2302 2303 2304 2305 2306 2307 2308 2309 2310
			/*
			 * 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;
2311

J
Johannes Berg 已提交
2312 2313 2314
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
2315

2316 2317 2318 2319 2320 2321 2322 2323
			/*
			 * 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
2324
				ieee80211_beacon_add_tim(ap, skb, beacon);
2325 2326 2327
			} else {
				unsigned long flags;

2328
				spin_lock_irqsave(&local->tim_lock, flags);
R
Rami Rosen 已提交
2329
				ieee80211_beacon_add_tim(ap, skb, beacon);
2330
				spin_unlock_irqrestore(&local->tim_lock, flags);
2331
			}
2332

2333 2334 2335 2336 2337
			if (tim_offset)
				*tim_offset = beacon->head_len;
			if (tim_length)
				*tim_length = skb->len - beacon->head_len;

J
Johannes Berg 已提交
2338 2339 2340
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
2341 2342
		} else
			goto out;
2343
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2344
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2345
		struct ieee80211_hdr *hdr;
2346
		struct sk_buff *presp = rcu_dereference(ifibss->presp);
2347

2348
		if (!presp)
2349 2350
			goto out;

2351
		skb = skb_copy(presp, GFP_ATOMIC);
2352 2353 2354 2355
		if (!skb)
			goto out;

		hdr = (struct ieee80211_hdr *) skb->data;
2356 2357
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2358
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2359 2360
		struct ieee80211_mgmt *mgmt;
		u8 *pos;
2361 2362
		int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
			      sizeof(mgmt->u.beacon);
2363

2364 2365 2366 2367 2368
#ifdef CONFIG_MAC80211_MESH
		if (!sdata->u.mesh.mesh_id_len)
			goto out;
#endif

2369 2370 2371 2372 2373 2374
		skb = dev_alloc_skb(local->tx_headroom +
				    hdr_len +
				    2 + /* NULL SSID */
				    2 + 8 + /* supported rates */
				    2 + 3 + /* DS params */
				    2 + (IEEE80211_MAX_SUPP_RATES - 8) +
2375 2376
				    2 + sizeof(struct ieee80211_ht_cap) +
				    2 + sizeof(struct ieee80211_ht_info) +
2377 2378 2379
				    2 + sdata->u.mesh.mesh_id_len +
				    2 + sizeof(struct ieee80211_meshconf_ie) +
				    sdata->u.mesh.ie_len);
J
Johannes Berg 已提交
2380 2381 2382 2383
		if (!skb)
			goto out;

		skb_reserve(skb, local->hw.extra_tx_headroom);
2384 2385
		mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
		memset(mgmt, 0, hdr_len);
2386 2387
		mgmt->frame_control =
		    cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2388
		memset(mgmt->da, 0xff, ETH_ALEN);
2389 2390
		memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
		memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
J
Johannes Berg 已提交
2391
		mgmt->u.beacon.beacon_int =
2392
			cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2393 2394
		mgmt->u.beacon.capab_info |= cpu_to_le16(
			sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
J
Johannes Berg 已提交
2395 2396 2397 2398 2399

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

2400
		if (ieee80211_add_srates_ie(&sdata->vif, skb) ||
2401
		    mesh_add_ds_params_ie(skb, sdata) ||
2402
		    ieee80211_add_ext_srates_ie(&sdata->vif, skb) ||
2403
		    mesh_add_rsn_ie(skb, sdata) ||
2404 2405
		    mesh_add_ht_cap_ie(skb, sdata) ||
		    mesh_add_ht_info_ie(skb, sdata) ||
2406 2407 2408 2409 2410 2411
		    mesh_add_meshid_ie(skb, sdata) ||
		    mesh_add_meshconf_ie(skb, sdata) ||
		    mesh_add_vendor_ies(skb, sdata)) {
			pr_err("o11s: couldn't add ies!\n");
			goto out;
		}
2412 2413
	} else {
		WARN_ON(1);
2414
		goto out;
2415 2416
	}

2417 2418
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
2419
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2420
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
2421
	info->band = band;
2422 2423 2424 2425 2426 2427 2428

	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;
2429 2430 2431 2432 2433
	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;
2434
	txrc.bss = true;
2435
	rate_control_get_rate(sdata, NULL, &txrc);
2436 2437

	info->control.vif = vif;
2438

2439 2440 2441
	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
			IEEE80211_TX_CTL_ASSIGN_SEQ |
			IEEE80211_TX_CTL_FIRST_FRAGMENT;
2442
 out:
2443
	rcu_read_unlock();
2444 2445
	return skb;
}
2446
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2447

2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478
struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif)
{
	struct ieee80211_if_ap *ap = NULL;
	struct sk_buff *presp = NULL, *skb = NULL;
	struct ieee80211_hdr *hdr;
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

	if (sdata->vif.type != NL80211_IFTYPE_AP)
		return NULL;

	rcu_read_lock();

	ap = &sdata->u.ap;
	presp = rcu_dereference(ap->probe_resp);
	if (!presp)
		goto out;

	skb = skb_copy(presp, GFP_ATOMIC);
	if (!skb)
		goto out;

	hdr = (struct ieee80211_hdr *) skb->data;
	memset(hdr->addr1, 0, sizeof(hdr->addr1));

out:
	rcu_read_unlock();
	return skb;
}
EXPORT_SYMBOL(ieee80211_proberesp_get);

2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495
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));
2496
	if (!skb)
2497
		return NULL;
2498

2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533
	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));
2534
	if (!skb)
2535
		return NULL;
2536

2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552
	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);

2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570
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);
2571
	if (!skb)
2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599
		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);

2600
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2601
		       const void *frame, size_t frame_len,
2602
		       const struct ieee80211_tx_info *frame_txctl,
2603 2604 2605 2606
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

2607 2608
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2609 2610
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
2611 2612 2613 2614 2615
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

2616
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2617
			     const void *frame, size_t frame_len,
2618
			     const struct ieee80211_tx_info *frame_txctl,
2619 2620 2621 2622
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

2623 2624
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2625 2626
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
2627 2628 2629 2630 2631
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
2632
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2633
			  struct ieee80211_vif *vif)
2634 2635
{
	struct ieee80211_local *local = hw_to_local(hw);
2636
	struct sk_buff *skb = NULL;
2637
	struct ieee80211_tx_data tx;
2638 2639
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_ap *bss = NULL;
2640
	struct beacon_data *beacon;
2641
	struct ieee80211_tx_info *info;
2642

2643
	sdata = vif_to_sdata(vif);
2644
	bss = &sdata->u.ap;
2645 2646 2647 2648

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

2649
	if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2650
		goto out;
2651

2652
	if (bss->dtim_count != 0 || !bss->dtim_bc_mc)
2653
		goto out; /* send buffered bc/mc only after DTIM beacon */
2654

2655 2656 2657
	while (1) {
		skb = skb_dequeue(&bss->ps_bc_buf);
		if (!skb)
2658
			goto out;
2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670
		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
2671
		if (!ieee80211_tx_prepare(sdata, &tx, skb))
2672 2673 2674
			break;
		dev_kfree_skb_any(skb);
	}
2675 2676 2677

	info = IEEE80211_SKB_CB(skb);

2678 2679
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
	tx.channel = local->hw.conf.channel;
2680
	info->band = tx.channel->band;
2681

2682
	if (invoke_tx_handlers(&tx))
2683
		skb = NULL;
2684
 out:
2685
	rcu_read_unlock();
2686 2687 2688 2689

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
2690

2691 2692
void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata,
			  struct sk_buff *skb, int tid)
J
Johannes Berg 已提交
2693 2694 2695 2696 2697
{
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

2698 2699
	skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
	skb->priority = tid;
2700

2701 2702 2703 2704 2705 2706
	/*
	 * 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
2707
	ieee80211_xmit(sdata, skb);
2708
	local_bh_enable();
J
Johannes Berg 已提交
2709
}