tx.c 77.0 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[info->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
			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;
143 144
		case IEEE80211_BAND_60GHZ:
			/* TODO, for now fall through */
145 146 147 148
		case IEEE80211_NUM_BANDS:
			WARN_ON(1);
			break;
		}
149 150 151 152 153 154 155
	}
	if (rate == -1) {
		/* No matching basic rate found; use highest suitable mandatory
		 * PHY rate */
		rate = mrate;
	}

156 157
	/* Don't calculate ACKs for QoS Frames with NoAck Policy set */
	if (ieee80211_is_data_qos(hdr->frame_control) &&
158
	    *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
159 160 161 162 163
		dur = 0;
	else
		/* Time needed to transmit ACK
		 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
		 * to closest integer */
164
		dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
J
Johannes Berg 已提交
165
				tx->sdata->vif.bss_conf.use_short_preamble);
166 167 168 169 170 171

	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 */
172
		dur += ieee80211_frame_duration(sband->band, next_frag_len,
173
				txrate->bitrate, erp,
J
Johannes Berg 已提交
174
				tx->sdata->vif.bss_conf.use_short_preamble);
175 176
	}

J
Johannes Berg 已提交
177
	return cpu_to_le16(dur);
178 179 180
}

/* tx handlers */
181 182 183 184
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
{
	struct ieee80211_local *local = tx->local;
185
	struct ieee80211_if_managed *ifmgd;
186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209

	/* 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;

210 211 212 213 214 215 216 217 218 219 220 221 222 223 224
	/* 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.
	 *
225
	 * Note: ifmgd->uapsd_queues access is racy here. If the value is
226 227 228
	 * changed via debugfs, user needs to reassociate manually to have
	 * everything in sync.
	 */
J
Johannes Berg 已提交
229 230 231
	if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
	    (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
	    skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
232 233
		return TX_CONTINUE;

234 235 236
	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
		ieee80211_stop_queues_by_reason(&local->hw,
						IEEE80211_QUEUE_STOP_REASON_PS);
237
		ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
238 239 240 241
		ieee80211_queue_work(&local->hw,
				     &local->dynamic_ps_disable_work);
	}

242 243 244 245
	/* Don't restart the timer if we're not disassociated */
	if (!ifmgd->associated)
		return TX_CONTINUE;

246 247 248 249 250
	mod_timer(&local->dynamic_ps_timer, jiffies +
		  msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));

	return TX_CONTINUE;
}
251

252
static ieee80211_tx_result debug_noinline
253
ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
254
{
255

256 257
	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
258
	bool assoc = false;
259

260
	if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
261
		return TX_CONTINUE;
262

263 264
	if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
	    test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
265 266 267 268 269 270 271 272 273 274 275 276 277
	    !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
		 */
278
		return TX_DROP;
279

B
Bill Jordan 已提交
280 281 282
	if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
		return TX_CONTINUE;

283
	if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
284 285
		return TX_CONTINUE;

286
	if (tx->flags & IEEE80211_TX_PS_BUFFERED)
287
		return TX_CONTINUE;
288

J
Johannes Berg 已提交
289 290
	if (tx->sta)
		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
291

292
	if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
J
Johannes Berg 已提交
293
		if (unlikely(!assoc &&
294
			     ieee80211_is_data(hdr->frame_control))) {
295
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
J
Johannes Berg 已提交
296 297 298 299
			sdata_info(tx->sdata,
				   "dropped data frame to not associated station %pM\n",
				   hdr->addr1);
#endif
300
			I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
301
			return TX_DROP;
302
		}
303 304
	} else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
			    ieee80211_is_data(hdr->frame_control) &&
305
			    !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
306 307 308 309 310
		/*
		 * No associated STAs - no need to send multicast
		 * frames.
		 */
		return TX_DROP;
311 312
	}

313
	return TX_CONTINUE;
314 315 316 317 318 319 320 321 322 323 324 325 326
}

/* 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;

327
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
328
		struct ieee80211_if_ap *ap;
329
		if (sdata->vif.type != NL80211_IFTYPE_AP)
330 331 332 333 334 335 336 337 338 339
			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);
	}

340 341 342 343
	/*
	 * Drop one frame from each station from the lowest-priority
	 * AC that has frames at all.
	 */
344
	list_for_each_entry_rcu(sta, &local->sta_list, list) {
345 346 347 348 349 350 351
		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++;
352
				ieee80211_free_txskb(&local->hw, skb);
353 354
				break;
			}
355 356
		}
	}
357

358
	local->total_ps_buffered = total;
J
Johannes Berg 已提交
359
	ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
360 361
}

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

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

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

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

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

388
	info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
389 390
	if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
		info->hw_queue = tx->sdata->vif.cab_queue;
J
Johannes Berg 已提交
391

392 393
	/* device releases frame after DTIM beacon */
	if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
J
Johannes Berg 已提交
394 395
		return TX_CONTINUE;

396
	/* buffered in mac80211 */
J
Johannes Berg 已提交
397 398 399 400
	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) {
J
Johannes Berg 已提交
401 402
		ps_dbg(tx->sdata,
		       "BC TX buffer full - dropping the oldest frame\n");
J
Johannes Berg 已提交
403 404 405
		dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
	} else
		tx->local->total_ps_buffered++;
406

J
Johannes Berg 已提交
407
	skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
408

J
Johannes Berg 已提交
409
	return TX_QUEUED;
410 411
}

412 413 414 415 416 417
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
418
	if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
419 420 421 422 423 424 425 426 427
		return 0;

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

	return 1;
}

428
static ieee80211_tx_result
429
ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
430 431
{
	struct sta_info *sta = tx->sta;
432
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
433
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
434
	struct ieee80211_local *local = tx->local;
435

436
	if (unlikely(!sta))
437
		return TX_CONTINUE;
438

J
Johannes Berg 已提交
439 440
	if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
		      test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
441
		     !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
442 443
		int ac = skb_get_queue_mapping(tx->skb);

444 445 446 447 448 449 450 451 452
		/* only deauth, disassoc and action are bufferable MMPDUs */
		if (ieee80211_is_mgmt(hdr->frame_control) &&
		    !ieee80211_is_deauth(hdr->frame_control) &&
		    !ieee80211_is_disassoc(hdr->frame_control) &&
		    !ieee80211_is_action(hdr->frame_control)) {
			info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
			return TX_CONTINUE;
		}

J
Johannes Berg 已提交
453 454
		ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
		       sta->sta.addr, sta->sta.aid, ac);
455 456
		if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
			purge_old_ps_buffers(tx->local);
457 458
		if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
			struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
J
Johannes Berg 已提交
459 460 461
			ps_dbg(tx->sdata,
			       "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
			       sta->sta.addr, ac);
462
			ieee80211_free_txskb(&local->hw, old);
463 464
		} else
			tx->local->total_ps_buffered++;
465

466
		info->control.jiffies = jiffies;
467
		info->control.vif = &tx->sdata->vif;
468
		info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
469
		skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
470 471 472 473 474 475

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

J
Johannes Berg 已提交
476 477 478 479 480 481
		/*
		 * We queued up some frames, so the TIM bit might
		 * need to be set, recalculate it.
		 */
		sta_info_recalc_tim(sta);

482
		return TX_QUEUED;
J
Johannes Berg 已提交
483 484 485 486
	} else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
		ps_dbg(tx->sdata,
		       "STA %pM in PS mode, but polling/in SP -> send frame\n",
		       sta->sta.addr);
487 488
	}

489
	return TX_CONTINUE;
490 491
}

492
static ieee80211_tx_result debug_noinline
493
ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
494
{
495
	if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
496
		return TX_CONTINUE;
497

498
	if (tx->flags & IEEE80211_TX_UNICAST)
499 500 501 502 503
		return ieee80211_tx_h_unicast_ps_buf(tx);
	else
		return ieee80211_tx_h_multicast_ps_buf(tx);
}

504 505 506 507 508 509 510 511 512 513 514 515
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;
}

516
static ieee80211_tx_result debug_noinline
517
ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
518
{
519
	struct ieee80211_key *key;
520
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
521
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
522

J
Johannes Berg 已提交
523
	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
524
		tx->key = NULL;
525
	else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
526
		tx->key = key;
527
	else if (ieee80211_is_mgmt(hdr->frame_control) &&
528 529
		 is_multicast_ether_addr(hdr->addr1) &&
		 ieee80211_is_robust_mgmt_frame(hdr) &&
530 531
		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
		tx->key = key;
532 533 534 535 536
	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)))
537
		tx->key = key;
538 539 540 541 542 543 544 545 546 547
	else if (info->flags & IEEE80211_TX_CTL_INJECTED)
		tx->key = NULL;
	else if (!tx->sdata->drop_unencrypted)
		tx->key = NULL;
	else if (tx->skb->protocol == tx->sdata->control_port_protocol)
		tx->key = NULL;
	else if (ieee80211_is_robust_mgmt_frame(hdr) &&
		 !(ieee80211_is_action(hdr->frame_control) &&
		   tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
		tx->key = NULL;
548 549 550
	else if (ieee80211_is_mgmt(hdr->frame_control) &&
		 !ieee80211_is_robust_mgmt_frame(hdr))
		tx->key = NULL;
551
	else {
552
		I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
553
		return TX_DROP;
554
	}
555 556

	if (tx->key) {
557 558
		bool skip_hw = false;

559
		tx->key->tx_rx_count++;
560
		/* TODO: add threshold stuff again */
561

562 563 564 565
		switch (tx->key->conf.cipher) {
		case WLAN_CIPHER_SUITE_WEP40:
		case WLAN_CIPHER_SUITE_WEP104:
		case WLAN_CIPHER_SUITE_TKIP:
566
			if (!ieee80211_is_data_present(hdr->frame_control))
567 568
				tx->key = NULL;
			break;
569
		case WLAN_CIPHER_SUITE_CCMP:
570 571 572 573
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
574 575
			else
				skip_hw = (tx->key->conf.flags &
576
					   IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
577
					ieee80211_is_mgmt(hdr->frame_control);
578
			break;
579
		case WLAN_CIPHER_SUITE_AES_CMAC:
580 581 582
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
583
		}
584

585 586 587
		if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED))
			return TX_DROP;

J
Johannes Berg 已提交
588
		if (!skip_hw && tx->key &&
J
Johannes Berg 已提交
589
		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
590
			info->control.hw_key = &tx->key->conf;
591 592
	}

593
	return TX_CONTINUE;
594 595
}

596
static ieee80211_tx_result debug_noinline
597
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
598
{
599
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
600 601 602
	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *rate;
S
Shanyu Zhao 已提交
603 604
	int i;
	u32 len;
605 606
	bool inval = false, rts = false, short_preamble = false;
	struct ieee80211_tx_rate_control txrc;
J
Johannes Berg 已提交
607
	bool assoc = false;
608

609
	memset(&txrc, 0, sizeof(txrc));
610

611
	sband = tx->local->hw.wiphy->bands[info->band];
612

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

	/* set up the tx rate control struct we give the RC algo */
J
Johannes Berg 已提交
617
	txrc.hw = &tx->local->hw;
618 619 620 621
	txrc.sband = sband;
	txrc.bss_conf = &tx->sdata->vif.bss_conf;
	txrc.skb = tx->skb;
	txrc.reported_rate.idx = -1;
622
	txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
623 624 625 626
	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;
627
	memcpy(txrc.rate_idx_mcs_mask,
628
	       tx->sdata->rc_rateidx_mcs_mask[info->band],
629
	       sizeof(txrc.rate_idx_mcs_mask));
630
	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
631
		    tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
632
		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
633 634

	/* set up RTS protection if desired */
635
	if (len > tx->local->hw.wiphy->rts_threshold) {
636
		txrc.rts = rts = true;
637 638
	}

639 640 641 642 643 644 645 646
	/*
	 * 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
647
	     (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
648
		txrc.short_preamble = short_preamble = true;
649

J
Johannes Berg 已提交
650 651
	if (tx->sta)
		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
652 653 654 655 656

	/*
	 * 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
657
	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
658 659 660 661
		 !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",
662
		 tx->sdata->name, hdr->addr1,
663
		 info->band ? 5 : 2))
664
		return TX_DROP;
665

666 667 668 669
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
670 671 672 673 674
	rate_control_get_rate(tx->sdata, tx->sta, &txrc);

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

675
	if (txrc.reported_rate.idx < 0) {
676
		txrc.reported_rate = info->control.rates[0];
677 678 679
		if (tx->sta && ieee80211_is_data(hdr->frame_control))
			tx->sta->last_tx_rate = txrc.reported_rate;
	} else if (tx->sta)
680
		tx->sta->last_tx_rate = txrc.reported_rate;
681

682 683
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
684

685 686 687 688
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

689 690 691 692 693
	if (is_multicast_ether_addr(hdr->addr1)) {
		/*
		 * XXX: verify the rate is in the basic rateset
		 */
		return TX_CONTINUE;
694 695
	}

696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720
	/*
	 * 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;
721 722
	}

723 724 725 726 727 728 729 730 731 732 733 734 735 736
	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;
		}
737

738 739 740 741 742 743 744 745
		/*
		 * 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;
		}
746

747 748 749 750
		/* set up RTS protection if desired */
		if (rts)
			info->control.rates[i].flags |=
				IEEE80211_TX_RC_USE_RTS_CTS;
751

752
		/* RC is busted */
S
Sujith 已提交
753 754
		if (WARN_ON_ONCE(info->control.rates[i].idx >=
				 sband->n_bitrates)) {
755 756
			info->control.rates[i].idx = -1;
			continue;
757
		}
758

759 760 761 762 763 764 765 766 767 768 769 770 771
		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;
772 773
	}

774 775 776
	return TX_CONTINUE;
}

777 778 779 780 781 782 783 784 785
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;

786 787 788 789 790
	/*
	 * 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.
	 */
791
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
792 793
		return TX_CONTINUE;

794 795 796 797 798 799
	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
		return TX_CONTINUE;

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

800 801 802
	if (ieee80211_is_qos_nullfunc(hdr->frame_control))
		return TX_CONTINUE;

J
Johannes Berg 已提交
803 804 805 806 807
	/*
	 * Anything but QoS data that has a sequence number field
	 * (is long enough) gets a sequence number from the global
	 * counter.
	 */
808
	if (!ieee80211_is_data_qos(hdr->frame_control)) {
J
Johannes Berg 已提交
809
		/* driver should assign sequence number */
810
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
J
Johannes Berg 已提交
811 812 813
		/* 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;
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
		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;
}

839
static int ieee80211_fragment(struct ieee80211_tx_data *tx,
J
Johannes Berg 已提交
840 841 842
			      struct sk_buff *skb, int hdrlen,
			      int frag_threshold)
{
843
	struct ieee80211_local *local = tx->local;
844
	struct ieee80211_tx_info *info;
845
	struct sk_buff *tmp;
J
Johannes Berg 已提交
846 847 848 849 850 851 852
	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;

853 854
	/* first fragment was already added to queue by caller */

J
Johannes Berg 已提交
855 856 857 858 859 860 861 862 863 864 865 866
	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;
867 868 869

		__skb_queue_tail(&tx->skbs, tmp);

J
Johannes Berg 已提交
870 871 872 873
		skb_reserve(tmp, local->tx_headroom +
				 IEEE80211_ENCRYPT_HEADROOM);
		/* copy control information */
		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
874 875 876 877 878 879 880 881

		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
882 883 884 885 886 887 888 889 890 891 892
		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;
	}

893
	/* adjust first fragment's length */
J
Johannes Berg 已提交
894 895 896 897
	skb->len = hdrlen + per_fragm;
	return 0;
}

898
static ieee80211_tx_result debug_noinline
899 900
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
J
Johannes Berg 已提交
901 902 903
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
904
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
J
Johannes Berg 已提交
905 906
	int hdrlen;
	int fragnum;
907

908 909 910 911
	/* no matter what happens, tx->skb moves to tx->skbs */
	__skb_queue_tail(&tx->skbs, skb);
	tx->skb = NULL;

912 913 914 915
	if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
		return TX_CONTINUE;

	if (tx->local->ops->set_frag_threshold)
916 917
		return TX_CONTINUE;

918 919
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
J
Johannes Berg 已提交
920
	 * This scenario is handled in ieee80211_tx_prepare but extra
921
	 * caution taken here as fragmented ampdu may cause Tx stop.
922
	 */
S
Sujith 已提交
923
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
924 925
		return TX_DROP;

926
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
927

928
	/* internal error, why isn't DONTFRAG set? */
929
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
J
Johannes Berg 已提交
930
		return TX_DROP;
931

J
Johannes Berg 已提交
932 933 934 935 936 937 938 939
	/*
	 * 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.
	 */
940
	if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
J
Johannes Berg 已提交
941
		return TX_DROP;
942

J
Johannes Berg 已提交
943 944
	/* update duration/seq/flags of fragments */
	fragnum = 0;
945 946

	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
947
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
948

J
Johannes Berg 已提交
949 950
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
951

952
		if (!skb_queue_is_last(&tx->skbs, skb)) {
J
Johannes Berg 已提交
953
			hdr->frame_control |= morefrags;
954 955 956 957 958 959 960
			/*
			 * 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;
961
			BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
962
			info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
J
Johannes Berg 已提交
963 964
		} else {
			hdr->frame_control &= ~morefrags;
965
		}
J
Johannes Berg 已提交
966 967
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
968
	}
969

970
	return TX_CONTINUE;
971 972
}

973 974 975
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
{
976
	struct sk_buff *skb;
977 978 979 980 981

	if (!tx->sta)
		return TX_CONTINUE;

	tx->sta->tx_packets++;
982
	skb_queue_walk(&tx->skbs, skb) {
983 984
		tx->sta->tx_fragments++;
		tx->sta->tx_bytes += skb->len;
985
	}
986 987 988 989

	return TX_CONTINUE;
}

990
static ieee80211_tx_result debug_noinline
991 992 993 994 995
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
	if (!tx->key)
		return TX_CONTINUE;

996 997 998
	switch (tx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
999
		return ieee80211_crypto_wep_encrypt(tx);
1000
	case WLAN_CIPHER_SUITE_TKIP:
1001
		return ieee80211_crypto_tkip_encrypt(tx);
1002
	case WLAN_CIPHER_SUITE_CCMP:
1003
		return ieee80211_crypto_ccmp_encrypt(tx);
1004
	case WLAN_CIPHER_SUITE_AES_CMAC:
1005
		return ieee80211_crypto_aes_cmac_encrypt(tx);
1006
	default:
1007
		return ieee80211_crypto_hw_encrypt(tx);
1008 1009 1010 1011 1012
	}

	return TX_DROP;
}

1013
static ieee80211_tx_result debug_noinline
J
Johannes Berg 已提交
1014 1015
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
1016
	struct sk_buff *skb;
J
Johannes Berg 已提交
1017 1018 1019
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
J
Johannes Berg 已提交
1020

1021
	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
1022
		hdr = (void *) skb->data;
1023 1024
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
1025 1026 1027 1028 1029
		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
1030
		group_addr = is_multicast_ether_addr(hdr->addr1);
J
Johannes Berg 已提交
1031

J
Johannes Berg 已提交
1032
		hdr->duration_id =
1033 1034
			ieee80211_duration(tx, skb, group_addr, next_len);
	}
J
Johannes Berg 已提交
1035 1036 1037 1038

	return TX_CONTINUE;
}

1039 1040
/* actual transmit path */

1041 1042 1043 1044 1045 1046 1047
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;
1048
	bool reset_agg_timer = false;
1049
	struct sk_buff *purge_skb = NULL;
1050 1051 1052

	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
		info->flags |= IEEE80211_TX_CTL_AMPDU;
1053
		reset_agg_timer = true;
1054 1055 1056 1057 1058
	} 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
		 */
1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078
	} 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
1079
		tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1080 1081 1082 1083 1084

		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;
1085
			reset_agg_timer = true;
1086 1087 1088 1089 1090
		} else {
			queued = true;
			info->control.vif = &tx->sdata->vif;
			info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
			__skb_queue_tail(&tid_tx->pending, skb);
1091 1092
			if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
				purge_skb = __skb_dequeue(&tid_tx->pending);
1093 1094
		}
		spin_unlock(&tx->sta->lock);
1095 1096

		if (purge_skb)
1097
			ieee80211_free_txskb(&tx->local->hw, purge_skb);
1098 1099
	}

1100 1101
	/* reset session timer */
	if (reset_agg_timer && tid_tx->timeout)
1102
		tid_tx->last_tx = jiffies;
1103

1104 1105 1106
	return queued;
}

1107 1108 1109
/*
 * initialises @tx
 */
1110
static ieee80211_tx_result
J
Johannes Berg 已提交
1111 1112 1113
ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
		     struct sk_buff *skb)
1114
{
J
Johannes Berg 已提交
1115
	struct ieee80211_local *local = sdata->local;
1116
	struct ieee80211_hdr *hdr;
1117
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
1118
	int tid;
1119
	u8 *qc;
1120 1121 1122 1123

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
J
Johannes Berg 已提交
1124
	tx->sdata = sdata;
1125
	__skb_queue_head_init(&tx->skbs);
1126

1127 1128 1129 1130 1131 1132 1133
	/*
	 * 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;

1134 1135
	hdr = (struct ieee80211_hdr *) skb->data;

1136
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1137
		tx->sta = rcu_dereference(sdata->u.vlan.sta);
1138 1139
		if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
			return TX_DROP;
1140 1141
	} else if (info->flags & IEEE80211_TX_CTL_INJECTED ||
		   tx->sdata->control_port_protocol == tx->skb->protocol) {
1142
		tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1143
	}
1144
	if (!tx->sta)
1145
		tx->sta = sta_info_get(sdata, hdr->addr1);
1146

1147
	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1148
	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1149 1150
	    (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
	    !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1151 1152
		struct tid_ampdu_tx *tid_tx;

S
Sujith 已提交
1153 1154 1155
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1156 1157 1158
		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
		if (tid_tx) {
			bool queued;
1159

1160 1161 1162 1163 1164 1165
			queued = ieee80211_tx_prep_agg(tx, skb, info,
						       tid_tx, tid);

			if (unlikely(queued))
				return TX_QUEUED;
		}
S
Sujith 已提交
1166 1167
	}

1168
	if (is_multicast_ether_addr(hdr->addr1)) {
1169
		tx->flags &= ~IEEE80211_TX_UNICAST;
1170
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1171
	} else
1172
		tx->flags |= IEEE80211_TX_UNICAST;
1173

1174 1175 1176 1177 1178
	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;
1179 1180
	}

1181
	if (!tx->sta)
1182
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
J
Johannes Berg 已提交
1183
	else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1184
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1185

1186
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1187

1188
	return TX_CONTINUE;
1189 1190
}

1191 1192 1193 1194 1195
static bool ieee80211_tx_frags(struct ieee80211_local *local,
			       struct ieee80211_vif *vif,
			       struct ieee80211_sta *sta,
			       struct sk_buff_head *skbs,
			       bool txpending)
1196
{
1197
	struct ieee80211_tx_control control;
1198
	struct sk_buff *skb, *tmp;
J
Johannes Berg 已提交
1199
	unsigned long flags;
1200

1201
	skb_queue_walk_safe(skbs, skb, tmp) {
1202 1203 1204 1205 1206 1207
		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
		int q = info->hw_queue;

#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (WARN_ON_ONCE(q >= local->hw.queues)) {
			__skb_unlink(skb, skbs);
1208
			ieee80211_free_txskb(&local->hw, skb);
1209 1210 1211
			continue;
		}
#endif
J
Johannes Berg 已提交
1212 1213 1214

		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		if (local->queue_stop_reasons[q] ||
1215 1216 1217 1218 1219 1220
		    (!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.
			 */
1221
			if (txpending)
J
Johannes Berg 已提交
1222
				skb_queue_splice_init(skbs, &local->pending[q]);
1223
			else
J
Johannes Berg 已提交
1224 1225
				skb_queue_splice_tail_init(skbs,
							   &local->pending[q]);
1226 1227 1228 1229 1230

			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);
			return false;
		}
J
Johannes Berg 已提交
1231
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1232

1233
		info->control.vif = vif;
1234
		control.sta = sta;
1235

1236
		__skb_unlink(skb, skbs);
1237
		drv_tx(local, &control, skb);
1238
	}
1239

1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256
	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;
1257

1258 1259
	if (WARN_ON(skb_queue_empty(skbs)))
		return true;
J
Johannes Berg 已提交
1260

1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274
	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:
1275
		sdata = rcu_dereference(local->monitor_sdata);
1276
		if (sdata) {
1277
			vif = &sdata->vif;
1278 1279 1280 1281 1282 1283
			info->hw_queue =
				vif->hw_queue[skb_get_queue_mapping(skb)];
		} else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
			dev_kfree_skb(skb);
			return true;
		} else
1284
			vif = NULL;
1285 1286 1287 1288 1289 1290 1291 1292
		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;
1293
	}
J
Johannes Berg 已提交
1294

1295 1296
	result = ieee80211_tx_frags(local, vif, pubsta, skbs,
				    txpending);
1297

1298 1299 1300
	ieee80211_tpt_led_trig_tx(local, fc, led_len);
	ieee80211_led_tx(local, 1);

J
Johannes Berg 已提交
1301
	WARN_ON_ONCE(!skb_queue_empty(skbs));
1302

1303
	return result;
1304 1305
}

1306 1307 1308 1309 1310 1311
/*
 * 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)
{
1312
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1313 1314
	ieee80211_tx_result res = TX_DROP;

1315 1316 1317 1318 1319 1320 1321
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1322
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1323 1324
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
1325
	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1326
	CALL_TXH(ieee80211_tx_h_select_key);
1327 1328
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1329

J
Johannes Berg 已提交
1330 1331 1332
	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
		__skb_queue_tail(&tx->skbs, tx->skb);
		tx->skb = NULL;
1333
		goto txh_done;
J
Johannes Berg 已提交
1334
	}
1335 1336

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1337 1338
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1339
	/* handlers after fragment must be aware of tx info fragmentation! */
1340 1341
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
1342 1343
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_calculate_duration);
1344
#undef CALL_TXH
1345

1346
 txh_done:
1347
	if (unlikely(res == TX_DROP)) {
1348
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1349
		if (tx->skb)
1350
			ieee80211_free_txskb(&tx->local->hw, tx->skb);
1351 1352
		else
			__skb_queue_purge(&tx->skbs);
1353 1354
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1355
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1356 1357 1358 1359 1360 1361
		return -1;
	}

	return 0;
}

1362 1363 1364 1365
/*
 * 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
1366 1367
			 struct sk_buff *skb, bool txpending,
			 enum ieee80211_band band)
1368
{
J
Johannes Berg 已提交
1369
	struct ieee80211_local *local = sdata->local;
1370
	struct ieee80211_tx_data tx;
1371
	ieee80211_tx_result res_prepare;
1372
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1373
	bool result = true;
1374
	int led_len;
1375 1376 1377

	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1378
		return true;
1379 1380
	}

1381
	/* initialises tx */
1382
	led_len = skb->len;
J
Johannes Berg 已提交
1383
	res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1384

1385
	if (unlikely(res_prepare == TX_DROP)) {
1386
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1387
		return true;
1388
	} else if (unlikely(res_prepare == TX_QUEUED)) {
J
Johannes Berg 已提交
1389
		return true;
1390 1391
	}

J
Johannes Berg 已提交
1392
	info->band = band;
1393

1394 1395 1396 1397 1398 1399
	/* set up hw_queue value early */
	if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
	    !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
		info->hw_queue =
			sdata->vif.hw_queue[skb_get_queue_mapping(skb)];

1400
	if (!invoke_tx_handlers(&tx))
1401 1402
		result = __ieee80211_tx(local, &tx.skbs, led_len,
					tx.sta, txpending);
J
Johannes Berg 已提交
1403

1404
	return result;
1405 1406 1407 1408
}

/* device xmit handlers */

1409
static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1410 1411 1412
				struct sk_buff *skb,
				int head_need, bool may_encrypt)
{
1413
	struct ieee80211_local *local = sdata->local;
1414 1415
	int tail_need = 0;

1416
	if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1417 1418 1419 1420 1421
		tail_need = IEEE80211_ENCRYPT_TAILROOM;
		tail_need -= skb_tailroom(skb);
		tail_need = max_t(int, tail_need, 0);
	}

1422
	if (skb_cloned(skb))
1423
		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1424
	else if (head_need || tail_need)
1425
		I802_DEBUG_INC(local->tx_expand_skb_head);
1426 1427
	else
		return 0;
1428 1429

	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
J
Joe Perches 已提交
1430 1431
		wiphy_debug(local->hw.wiphy,
			    "failed to reallocate TX buffer\n");
1432 1433 1434 1435 1436 1437
		return -ENOMEM;
	}

	return 0;
}

J
Johannes Berg 已提交
1438 1439
void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
		    enum ieee80211_band band)
1440
{
J
Johannes Berg 已提交
1441
	struct ieee80211_local *local = sdata->local;
1442
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1443
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1444
	int headroom;
1445
	bool may_encrypt;
1446

J
Johannes Berg 已提交
1447
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1448

J
Johannes Berg 已提交
1449
	headroom = local->tx_headroom;
1450 1451 1452 1453 1454
	if (may_encrypt)
		headroom += IEEE80211_ENCRYPT_HEADROOM;
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

1455
	if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1456
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1457
		return;
1458 1459
	}

1460
	hdr = (struct ieee80211_hdr *) skb->data;
1461
	info->control.vif = &sdata->vif;
1462

1463 1464
	if (ieee80211_vif_is_mesh(&sdata->vif) &&
	    ieee80211_is_data(hdr->frame_control) &&
1465 1466 1467 1468 1469
	    !is_multicast_ether_addr(hdr->addr1) &&
	    mesh_nexthop_resolve(skb, sdata)) {
		/* skb queued: don't free */
		return;
	}
1470

1471
	ieee80211_set_qos_hdr(sdata, skb);
J
Johannes Berg 已提交
1472
	ieee80211_tx(sdata, skb, false, band);
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 1552 1553 1554 1555 1556 1557
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;
}

1558 1559
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1560 1561
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
J
Johannes Berg 已提交
1562 1563
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
1564 1565
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1566
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1567
	struct ieee80211_hdr *hdr;
J
Johannes Berg 已提交
1568
	struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1569
	u16 len_rthdr;
J
Johannes Berg 已提交
1570
	int hdrlen;
1571

1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585
	/* 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 */
1586 1587 1588 1589 1590 1591 1592

	/*
	 * 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
	 */
1593
	skb_set_mac_header(skb, len_rthdr);
1594
	/*
1595 1596
	 * 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
1597
	 */
1598 1599
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1600

J
Johannes Berg 已提交
1601 1602 1603 1604 1605 1606 1607 1608 1609
	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;

1610 1611 1612 1613
	/*
	 * Initialize skb->protocol if the injected frame is a data frame
	 * carrying a rfc1042 header
	 */
J
Johannes Berg 已提交
1614 1615 1616 1617
	if (ieee80211_is_data(hdr->frame_control) &&
	    skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
		u8 *payload = (u8 *)hdr + hdrlen;

1618
		if (ether_addr_equal(payload, rfc1042_header))
J
Johannes Berg 已提交
1619 1620
			skb->protocol = cpu_to_be16((payload[6] << 8) |
						    payload[7]);
1621 1622
	}

J
Johannes Berg 已提交
1623 1624
	memset(info, 0, sizeof(*info));

J
Johannes Berg 已提交
1625
	info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1626 1627 1628 1629 1630
		      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
1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650

	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;
1651
		if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
J
Johannes Berg 已提交
1652 1653 1654 1655
			sdata = tmp_sdata;
			break;
		}
	}
1656

J
Johannes Berg 已提交
1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		tmp_sdata = rcu_dereference(local->monitor_sdata);
		if (tmp_sdata)
			chanctx_conf =
				rcu_dereference(tmp_sdata->vif.chanctx_conf);
	}
	if (!chanctx_conf)
		goto fail_rcu;

	chan = chanctx_conf->channel;

	/*
	 * 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_rcu;

	ieee80211_xmit(sdata, skb, chan->band);
J
Johannes Berg 已提交
1690 1691
	rcu_read_unlock();

1692
	return NETDEV_TX_OK;
1693

J
Johannes Berg 已提交
1694 1695
fail_rcu:
	rcu_read_unlock();
1696 1697 1698
fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715
}

/**
 * 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).
 */
1716 1717
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
				    struct net_device *dev)
1718
{
1719 1720
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
1721
	struct ieee80211_tx_info *info;
1722
	int head_need;
1723 1724
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
1725
	struct ieee80211_hdr hdr;
1726
	struct ieee80211s_hdr mesh_hdr __maybe_unused;
1727
	struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1728 1729
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
1730
	int nh_pos, h_pos;
1731
	struct sta_info *sta = NULL;
J
Johannes Berg 已提交
1732
	bool wme_sta = false, authorized = false, tdls_auth = false;
1733
	bool tdls_direct = false;
J
Johannes Berg 已提交
1734 1735 1736
	bool multicast;
	u32 info_flags = 0;
	u16 info_id = 0;
J
Johannes Berg 已提交
1737 1738 1739
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_sub_if_data *ap_sdata;
	enum ieee80211_band band;
1740

1741
	if (unlikely(skb->len < ETH_HLEN))
1742 1743 1744 1745 1746
		goto fail;

	/* convert Ethernet header to proper 802.11 header (based on
	 * operation mode) */
	ethertype = (skb->data[12] << 8) | skb->data[13];
1747
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1748

J
Johannes Berg 已提交
1749 1750
	rcu_read_lock();

1751
	switch (sdata->vif.type) {
1752
	case NL80211_IFTYPE_AP_VLAN:
1753
		sta = rcu_dereference(sdata->u.vlan.sta);
1754 1755 1756 1757
		if (sta) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.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;
J
Johannes Berg 已提交
1762 1763
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
			wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1764
		}
J
Johannes Berg 已提交
1765 1766 1767 1768 1769 1770
		ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
					u.ap);
		chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
		band = chanctx_conf->channel->band;
1771 1772 1773 1774
		if (sta)
			break;
		/* fall through */
	case NL80211_IFTYPE_AP:
1775
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1776 1777
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
1778
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1779 1780
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
J
Johannes Berg 已提交
1781 1782 1783 1784 1785
		if (sdata->vif.type == NL80211_IFTYPE_AP)
			chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
		band = chanctx_conf->channel->band;
1786
		break;
1787
	case NL80211_IFTYPE_WDS:
1788
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1789 1790
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1791
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1792 1793 1794
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
J
Johannes Berg 已提交
1795 1796 1797 1798 1799
		/*
		 * This is the exception! WDS style interfaces are prohibited
		 * when channel contexts are in used so this must be valid
		 */
		band = local->hw.conf.channel->band;
1800
		break;
1801
#ifdef CONFIG_MAC80211_MESH
1802
	case NL80211_IFTYPE_MESH_POINT:
1803
		if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1804
			/* Do not send frames with mesh_ttl == 0 */
1805
			sdata->u.mesh.mshstats.dropped_frames_ttl++;
J
Johannes Berg 已提交
1806
			goto fail_rcu;
1807
		}
J
Johannes Berg 已提交
1808

1809 1810 1811 1812 1813
		if (!is_multicast_ether_addr(skb->data)) {
			mpath = mesh_path_lookup(skb->data, sdata);
			if (!mpath)
				mppath = mpp_path_lookup(skb->data, sdata);
		}
1814

1815
		/*
1816 1817 1818 1819
		 * 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)
1820
		 */
1821 1822
		if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
		    !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1823 1824 1825
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
			meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1826
					sdata, NULL, NULL);
1827
		} else {
1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839
			/* DS -> MBSS (802.11-2012 13.11.3.3).
			 * For unicast with unknown forwarding information,
			 * destination might be in the MBSS or if that fails
			 * forwarded to another mesh gate. In either case
			 * resolution will be handled in ieee80211_xmit(), so
			 * leave the original DA. This also works for mcast */
			const u8 *mesh_da = skb->data;

			if (mppath)
				mesh_da = mppath->mpp;
			else if (mpath)
				mesh_da = mpath->dst;
1840

1841
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1842
					mesh_da, sdata->vif.addr);
1843 1844
			if (is_multicast_ether_addr(mesh_da))
				/* DA TA mSA AE:SA */
1845 1846 1847 1848 1849 1850
				meshhdrlen =
					ieee80211_new_mesh_header(&mesh_hdr,
							sdata,
							skb->data + ETH_ALEN,
							NULL);
			else
1851
				/* RA TA mDA mSA AE:DA SA */
1852 1853 1854 1855 1856
				meshhdrlen =
					ieee80211_new_mesh_header(&mesh_hdr,
							sdata,
							skb->data,
							skb->data + ETH_ALEN);
1857 1858

		}
J
Johannes Berg 已提交
1859 1860 1861 1862
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
		band = chanctx_conf->channel->band;
1863 1864
		break;
#endif
1865
	case NL80211_IFTYPE_STATION:
1866
		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
J
Johannes Berg 已提交
1867 1868
			bool tdls_peer = false;

1869
			sta = sta_info_get(sdata, skb->data);
J
Johannes Berg 已提交
1870 1871 1872 1873 1874 1875 1876 1877 1878
			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);
			}
1879 1880 1881 1882 1883 1884

			/*
			 * If the TDLS link is enabled, send everything
			 * directly. Otherwise, allow TDLS setup frames
			 * to be transmitted indirectly.
			 */
J
Johannes Berg 已提交
1885
			tdls_direct = tdls_peer && (tdls_auth ||
1886 1887 1888 1889 1890 1891
				 !(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 */
1892
			if (!tdls_auth)
J
Johannes Berg 已提交
1893
				goto fail_rcu;
1894 1895 1896 1897 1898 1899 1900 1901 1902 1903

			/* 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);
1904
			/* RA TA DA SA */
1905
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1906
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1907 1908 1909 1910 1911 1912
			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 */
1913
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1914 1915 1916 1917
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			hdrlen = 24;
		}
J
Johannes Berg 已提交
1918 1919 1920 1921
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
		band = chanctx_conf->channel->band;
1922
		break;
1923
	case NL80211_IFTYPE_ADHOC:
1924 1925 1926
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1927
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1928
		hdrlen = 24;
J
Johannes Berg 已提交
1929 1930 1931 1932
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
		band = chanctx_conf->channel->band;
1933 1934
		break;
	default:
J
Johannes Berg 已提交
1935
		goto fail_rcu;
1936 1937
	}

1938 1939 1940 1941 1942
	/*
	 * 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
1943 1944
	multicast = is_multicast_ether_addr(hdr.addr1);
	if (!multicast) {
1945
		sta = sta_info_get(sdata, hdr.addr1);
J
Johannes Berg 已提交
1946 1947 1948 1949
		if (sta) {
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
			wme_sta = test_sta_flag(sta, WLAN_STA_WME);
		}
1950 1951
	}

1952 1953
	/* For mesh, the use of the QoS header is mandatory */
	if (ieee80211_vif_is_mesh(&sdata->vif))
J
Johannes Berg 已提交
1954
		wme_sta = true;
1955

1956
	/* receiver and we are QoS enabled, use a QoS type frame */
J
Johannes Berg 已提交
1957
	if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
1958
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1959 1960 1961 1962
		hdrlen += 2;
	}

	/*
1963 1964
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
1965
	 */
1966 1967 1968
	if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
		     !is_multicast_ether_addr(hdr.addr1) && !authorized &&
		     (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
1969
		      !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
1970
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
J
Johannes Berg 已提交
1971
		net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
1972
				    dev->name, hdr.addr1);
1973 1974 1975 1976
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

J
Johannes Berg 已提交
1977
		goto fail_rcu;
1978 1979
	}

J
Johannes Berg 已提交
1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018
	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;
		}
	}

2019 2020 2021 2022
	/*
	 * If the skb is shared we need to obtain our own copy.
	 */
	if (skb_shared(skb)) {
J
Johannes Berg 已提交
2023 2024 2025 2026 2027
		struct sk_buff *tmp_skb = skb;

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

2028
		skb = skb_clone(skb, GFP_ATOMIC);
2029 2030
		kfree_skb(tmp_skb);

2031
		if (!skb)
J
Johannes Berg 已提交
2032
			goto fail_rcu;
2033 2034
	}

2035
	hdr.frame_control = fc;
2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052
	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;
	}

2053 2054 2055
	nh_pos = skb_network_header(skb) - skb->data;
	h_pos = skb_transport_header(skb) - skb->data;

2056 2057 2058 2059
	skb_pull(skb, skip_header_bytes);
	nh_pos -= skip_header_bytes;
	h_pos -= skip_header_bytes;

2060
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2061

2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072
	/*
	 * 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.
	 */
2073

2074
	if (head_need > 0 || skb_cloned(skb)) {
2075 2076 2077
		head_need += IEEE80211_ENCRYPT_HEADROOM;
		head_need += local->tx_headroom;
		head_need = max_t(int, 0, head_need);
2078 2079
		if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
			ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
2080
			goto fail_rcu;
2081
		}
2082 2083 2084 2085 2086 2087 2088
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
2089

2090
#ifdef CONFIG_MAC80211_MESH
2091 2092 2093 2094 2095
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}
2096
#endif
2097

2098
	if (ieee80211_is_data_qos(fc)) {
2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110
		__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);

2111 2112 2113
	nh_pos += hdrlen;
	h_pos += hdrlen;

2114 2115
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
2116 2117 2118 2119 2120 2121 2122 2123

	/* 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);

2124
	info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
2125 2126
	memset(info, 0, sizeof(*info));

2127
	dev->trans_start = jiffies;
J
Johannes Berg 已提交
2128 2129 2130 2131

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

J
Johannes Berg 已提交
2132 2133
	ieee80211_xmit(sdata, skb, band);
	rcu_read_unlock();
2134

2135
	return NETDEV_TX_OK;
2136

J
Johannes Berg 已提交
2137 2138
 fail_rcu:
	rcu_read_unlock();
2139
 fail:
2140 2141
	dev_kfree_skb(skb);
	return NETDEV_TX_OK;
2142 2143 2144
}


2145 2146 2147 2148
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
2149 2150
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
J
Johannes Berg 已提交
2151
	int i;
2152

2153 2154
	for (i = 0; i < local->hw.queues; i++)
		skb_queue_purge(&local->pending[i]);
2155 2156
}

2157 2158 2159 2160 2161
/*
 * 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.
 */
2162 2163 2164 2165 2166 2167 2168
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;
2169
	bool result;
J
Johannes Berg 已提交
2170
	struct ieee80211_chanctx_conf *chanctx_conf;
2171

2172
	sdata = vif_to_sdata(info->control.vif);
2173 2174

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
J
Johannes Berg 已提交
2175 2176 2177 2178 2179 2180 2181
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (unlikely(!chanctx_conf)) {
			dev_kfree_skb(skb);
			return true;
		}
		result = ieee80211_tx(sdata, skb, true,
				      chanctx_conf->channel->band);
2182
	} else {
2183 2184 2185 2186 2187
		struct sk_buff_head skbs;

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

2188
		hdr = (struct ieee80211_hdr *)skb->data;
2189
		sta = sta_info_get(sdata, hdr->addr1);
2190

2191
		result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2192 2193 2194 2195 2196
	}

	return result;
}

2197
/*
J
Johannes Berg 已提交
2198
 * Transmit all pending packets. Called from tasklet.
2199
 */
2200 2201 2202
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
2203
	unsigned long flags;
2204
	int i;
J
Johannes Berg 已提交
2205
	bool txok;
2206

2207
	rcu_read_lock();
2208

J
Johannes Berg 已提交
2209
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2210 2211 2212 2213 2214
	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
2215
		if (local->queue_stop_reasons[i] ||
2216
		    skb_queue_empty(&local->pending[i]))
2217
			continue;
2218

2219
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
2220
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2221 2222
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

2223
			if (WARN_ON(!info->control.vif)) {
2224
				ieee80211_free_txskb(&local->hw, skb);
2225 2226 2227
				continue;
			}

J
Johannes Berg 已提交
2228 2229 2230 2231 2232 2233 2234
			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)
2235
				break;
2236
		}
2237 2238

		if (skb_queue_empty(&local->pending[i]))
2239
			ieee80211_propagate_queue_wake(local, i);
2240
	}
J
Johannes Berg 已提交
2241
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2242

2243
	rcu_read_unlock();
2244 2245 2246 2247
}

/* functions for drivers to get certain frames */

2248 2249
static void ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_if_ap *bss,
2250 2251
				     struct sk_buff *skb,
				     struct beacon_data *beacon)
2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265
{
	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)
2266
		bss->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2267 2268 2269 2270 2271 2272 2273
	else
		bss->dtim_count--;

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
	*pos++ = bss->dtim_count;
2274
	*pos++ = sdata->vif.bss_conf.dtim_period;
2275 2276 2277 2278

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

2279 2280
	bss->dtim_bc_mc = aid0 == 1;

2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302
	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 */
2303
		skb_put(skb, n2 - n1);
2304 2305 2306 2307 2308 2309 2310 2311 2312
		memcpy(pos, bss->tim + n1, n2 - n1 + 1);

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

2313 2314 2315
struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
					 struct ieee80211_vif *vif,
					 u16 *tim_offset, u16 *tim_length)
2316 2317
{
	struct ieee80211_local *local = hw_to_local(hw);
2318
	struct sk_buff *skb = NULL;
2319
	struct ieee80211_tx_info *info;
2320 2321
	struct ieee80211_sub_if_data *sdata = NULL;
	struct ieee80211_if_ap *ap = NULL;
2322
	struct beacon_data *beacon;
J
Johannes Berg 已提交
2323
	enum ieee80211_band band;
2324
	struct ieee80211_tx_rate_control txrc;
J
Johannes Berg 已提交
2325
	struct ieee80211_chanctx_conf *chanctx_conf;
2326

2327
	rcu_read_lock();
2328

2329
	sdata = vif_to_sdata(vif);
J
Johannes Berg 已提交
2330
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2331

J
Johannes Berg 已提交
2332
	if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2333 2334
		goto out;

2335 2336 2337 2338 2339
	if (tim_offset)
		*tim_offset = 0;
	if (tim_length)
		*tim_length = 0;

2340
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
2341 2342
		ap = &sdata->u.ap;
		beacon = rcu_dereference(ap->beacon);
D
Dan Carpenter 已提交
2343
		if (beacon) {
J
Johannes Berg 已提交
2344 2345 2346 2347 2348 2349 2350 2351 2352
			/*
			 * 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;
2353

J
Johannes Berg 已提交
2354 2355 2356
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
2357

2358 2359 2360 2361 2362 2363 2364 2365
			/*
			 * 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) {
2366 2367
				ieee80211_beacon_add_tim(sdata, ap, skb,
							 beacon);
2368 2369 2370
			} else {
				unsigned long flags;

2371
				spin_lock_irqsave(&local->tim_lock, flags);
2372 2373
				ieee80211_beacon_add_tim(sdata, ap, skb,
							 beacon);
2374
				spin_unlock_irqrestore(&local->tim_lock, flags);
2375
			}
2376

2377 2378 2379 2380 2381
			if (tim_offset)
				*tim_offset = beacon->head_len;
			if (tim_length)
				*tim_length = skb->len - beacon->head_len;

J
Johannes Berg 已提交
2382 2383 2384
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
2385 2386
		} else
			goto out;
2387
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2388
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2389
		struct ieee80211_hdr *hdr;
2390
		struct sk_buff *presp = rcu_dereference(ifibss->presp);
2391

2392
		if (!presp)
2393 2394
			goto out;

2395
		skb = skb_copy(presp, GFP_ATOMIC);
2396 2397 2398 2399
		if (!skb)
			goto out;

		hdr = (struct ieee80211_hdr *) skb->data;
2400 2401
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2402
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2403
		struct ieee80211_mgmt *mgmt;
2404
		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2405
		u8 *pos;
2406 2407
		int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
			      sizeof(mgmt->u.beacon);
2408

2409 2410 2411 2412 2413
#ifdef CONFIG_MAC80211_MESH
		if (!sdata->u.mesh.mesh_id_len)
			goto out;
#endif

2414 2415 2416 2417
		if (ifmsh->sync_ops)
			ifmsh->sync_ops->adjust_tbtt(
						sdata);

2418 2419 2420 2421 2422 2423
		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) +
2424
				    2 + sizeof(struct ieee80211_ht_cap) +
2425
				    2 + sizeof(struct ieee80211_ht_operation) +
2426 2427 2428
				    2 + sdata->u.mesh.mesh_id_len +
				    2 + sizeof(struct ieee80211_meshconf_ie) +
				    sdata->u.mesh.ie_len);
J
Johannes Berg 已提交
2429 2430 2431 2432
		if (!skb)
			goto out;

		skb_reserve(skb, local->hw.extra_tx_headroom);
2433 2434
		mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
		memset(mgmt, 0, hdr_len);
2435 2436
		mgmt->frame_control =
		    cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2437
		eth_broadcast_addr(mgmt->da);
2438 2439
		memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
		memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
J
Johannes Berg 已提交
2440
		mgmt->u.beacon.beacon_int =
2441
			cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2442 2443
		mgmt->u.beacon.capab_info |= cpu_to_le16(
			sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
J
Johannes Berg 已提交
2444 2445 2446 2447 2448

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

J
Johannes Berg 已提交
2449 2450
		band = chanctx_conf->channel->band;

2451
		if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
2452
		    mesh_add_ds_params_ie(skb, sdata) ||
2453
		    ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
2454
		    mesh_add_rsn_ie(skb, sdata) ||
2455
		    mesh_add_ht_cap_ie(skb, sdata) ||
2456
		    mesh_add_ht_oper_ie(skb, sdata) ||
2457 2458 2459 2460 2461 2462
		    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;
		}
2463 2464
	} else {
		WARN_ON(1);
2465
		goto out;
2466 2467
	}

J
Johannes Berg 已提交
2468 2469
	band = chanctx_conf->channel->band;

2470 2471
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
2472
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2473
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
2474
	info->band = band;
2475 2476 2477

	memset(&txrc, 0, sizeof(txrc));
	txrc.hw = hw;
2478
	txrc.sband = local->hw.wiphy->bands[band];
2479 2480 2481
	txrc.bss_conf = &sdata->vif.bss_conf;
	txrc.skb = skb;
	txrc.reported_rate.idx = -1;
2482
	txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2483
	if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2484 2485 2486
		txrc.max_rate_idx = -1;
	else
		txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2487 2488
	memcpy(txrc.rate_idx_mcs_mask, sdata->rc_rateidx_mcs_mask[band],
	       sizeof(txrc.rate_idx_mcs_mask));
2489
	txrc.bss = true;
2490
	rate_control_get_rate(sdata, NULL, &txrc);
2491 2492

	info->control.vif = vif;
2493

2494 2495 2496
	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
			IEEE80211_TX_CTL_ASSIGN_SEQ |
			IEEE80211_TX_CTL_FIRST_FRAGMENT;
2497
 out:
2498
	rcu_read_unlock();
2499 2500
	return skb;
}
2501
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2502

2503 2504 2505 2506
struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif)
{
	struct ieee80211_if_ap *ap = NULL;
2507 2508
	struct sk_buff *skb = NULL;
	struct probe_resp *presp = NULL;
2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521
	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;

2522
	skb = dev_alloc_skb(presp->len);
2523 2524 2525
	if (!skb)
		goto out;

2526 2527
	memcpy(skb_put(skb, presp->len), presp->data, presp->len);

2528 2529 2530 2531 2532 2533 2534 2535 2536
	hdr = (struct ieee80211_hdr *) skb->data;
	memset(hdr->addr1, 0, sizeof(hdr->addr1));

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

2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553
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));
2554
	if (!skb)
2555
		return NULL;
2556

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

2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610
	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);

2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628
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);
2629
	if (!skb)
2630 2631 2632 2633 2634 2635 2636 2637
		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);
J
Johannes Berg 已提交
2638
	eth_broadcast_addr(hdr->addr1);
2639
	memcpy(hdr->addr2, vif->addr, ETH_ALEN);
J
Johannes Berg 已提交
2640
	eth_broadcast_addr(hdr->addr3);
2641 2642 2643 2644

	pos = skb_put(skb, ie_ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = ssid_len;
2645
	if (ssid_len)
2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657
		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);

2658
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2659
		       const void *frame, size_t frame_len,
2660
		       const struct ieee80211_tx_info *frame_txctl,
2661 2662 2663 2664
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

2665 2666
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2667 2668
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
2669 2670 2671 2672 2673
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

2674
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2675
			     const void *frame, size_t frame_len,
2676
			     const struct ieee80211_tx_info *frame_txctl,
2677 2678 2679 2680
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

2681 2682
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2683 2684
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
2685 2686 2687 2688 2689
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
2690
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2691
			  struct ieee80211_vif *vif)
2692 2693
{
	struct ieee80211_local *local = hw_to_local(hw);
2694
	struct sk_buff *skb = NULL;
2695
	struct ieee80211_tx_data tx;
2696 2697
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_ap *bss = NULL;
2698
	struct beacon_data *beacon;
2699
	struct ieee80211_tx_info *info;
J
Johannes Berg 已提交
2700
	struct ieee80211_chanctx_conf *chanctx_conf;
2701

2702
	sdata = vif_to_sdata(vif);
2703
	bss = &sdata->u.ap;
2704 2705 2706

	rcu_read_lock();
	beacon = rcu_dereference(bss->beacon);
J
Johannes Berg 已提交
2707
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2708

J
Johannes Berg 已提交
2709 2710
	if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head ||
	    !chanctx_conf)
2711
		goto out;
2712

2713
	if (bss->dtim_count != 0 || !bss->dtim_bc_mc)
2714
		goto out; /* send buffered bc/mc only after DTIM beacon */
2715

2716 2717 2718
	while (1) {
		skb = skb_dequeue(&bss->ps_bc_buf);
		if (!skb)
2719
			goto out;
2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731
		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
2732
		if (!ieee80211_tx_prepare(sdata, &tx, skb))
2733 2734 2735
			break;
		dev_kfree_skb_any(skb);
	}
2736 2737 2738

	info = IEEE80211_SKB_CB(skb);

2739
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
J
Johannes Berg 已提交
2740
	info->band = chanctx_conf->channel->band;
2741

2742
	if (invoke_tx_handlers(&tx))
2743
		skb = NULL;
2744
 out:
2745
	rcu_read_unlock();
2746 2747 2748 2749

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
2750

J
Johannes Berg 已提交
2751 2752 2753
void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
				 struct sk_buff *skb, int tid,
				 enum ieee80211_band band)
J
Johannes Berg 已提交
2754
{
2755
	int ac = ieee802_1d_to_ac[tid & 7];
2756

J
Johannes Berg 已提交
2757 2758 2759 2760
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

2761
	skb_set_queue_mapping(skb, ac);
2762
	skb->priority = tid;
2763

2764 2765 2766 2767 2768 2769
	/*
	 * 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
2770
	ieee80211_xmit(sdata, skb, band);
2771
	local_bh_enable();
J
Johannes Berg 已提交
2772
}