xref: /openbmc/linux/net/mac80211/tx.c (revision 4da722ca)
1 /*
2  * Copyright 2002-2005, Instant802 Networks, Inc.
3  * Copyright 2005-2006, Devicescape Software, Inc.
4  * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
5  * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
6  * Copyright 2013-2014  Intel Mobile Communications GmbH
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  *
12  *
13  * Transmit and frame generation functions.
14  */
15 
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/if_vlan.h>
20 #include <linux/etherdevice.h>
21 #include <linux/bitmap.h>
22 #include <linux/rcupdate.h>
23 #include <linux/export.h>
24 #include <net/net_namespace.h>
25 #include <net/ieee80211_radiotap.h>
26 #include <net/cfg80211.h>
27 #include <net/mac80211.h>
28 #include <net/codel.h>
29 #include <net/codel_impl.h>
30 #include <asm/unaligned.h>
31 #include <net/fq_impl.h>
32 
33 #include "ieee80211_i.h"
34 #include "driver-ops.h"
35 #include "led.h"
36 #include "mesh.h"
37 #include "wep.h"
38 #include "wpa.h"
39 #include "wme.h"
40 #include "rate.h"
41 
42 /* misc utils */
43 
44 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
45 {
46 	struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
47 
48 	u64_stats_update_begin(&tstats->syncp);
49 	tstats->tx_packets++;
50 	tstats->tx_bytes += len;
51 	u64_stats_update_end(&tstats->syncp);
52 }
53 
54 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
55 				 struct sk_buff *skb, int group_addr,
56 				 int next_frag_len)
57 {
58 	int rate, mrate, erp, dur, i, shift = 0;
59 	struct ieee80211_rate *txrate;
60 	struct ieee80211_local *local = tx->local;
61 	struct ieee80211_supported_band *sband;
62 	struct ieee80211_hdr *hdr;
63 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
64 	struct ieee80211_chanctx_conf *chanctx_conf;
65 	u32 rate_flags = 0;
66 
67 	/* assume HW handles this */
68 	if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
69 		return 0;
70 
71 	rcu_read_lock();
72 	chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
73 	if (chanctx_conf) {
74 		shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
75 		rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
76 	}
77 	rcu_read_unlock();
78 
79 	/* uh huh? */
80 	if (WARN_ON_ONCE(tx->rate.idx < 0))
81 		return 0;
82 
83 	sband = local->hw.wiphy->bands[info->band];
84 	txrate = &sband->bitrates[tx->rate.idx];
85 
86 	erp = txrate->flags & IEEE80211_RATE_ERP_G;
87 
88 	/*
89 	 * data and mgmt (except PS Poll):
90 	 * - during CFP: 32768
91 	 * - during contention period:
92 	 *   if addr1 is group address: 0
93 	 *   if more fragments = 0 and addr1 is individual address: time to
94 	 *      transmit one ACK plus SIFS
95 	 *   if more fragments = 1 and addr1 is individual address: time to
96 	 *      transmit next fragment plus 2 x ACK plus 3 x SIFS
97 	 *
98 	 * IEEE 802.11, 9.6:
99 	 * - control response frame (CTS or ACK) shall be transmitted using the
100 	 *   same rate as the immediately previous frame in the frame exchange
101 	 *   sequence, if this rate belongs to the PHY mandatory rates, or else
102 	 *   at the highest possible rate belonging to the PHY rates in the
103 	 *   BSSBasicRateSet
104 	 */
105 	hdr = (struct ieee80211_hdr *)skb->data;
106 	if (ieee80211_is_ctl(hdr->frame_control)) {
107 		/* TODO: These control frames are not currently sent by
108 		 * mac80211, but should they be implemented, this function
109 		 * needs to be updated to support duration field calculation.
110 		 *
111 		 * RTS: time needed to transmit pending data/mgmt frame plus
112 		 *    one CTS frame plus one ACK frame plus 3 x SIFS
113 		 * CTS: duration of immediately previous RTS minus time
114 		 *    required to transmit CTS and its SIFS
115 		 * ACK: 0 if immediately previous directed data/mgmt had
116 		 *    more=0, with more=1 duration in ACK frame is duration
117 		 *    from previous frame minus time needed to transmit ACK
118 		 *    and its SIFS
119 		 * PS Poll: BIT(15) | BIT(14) | aid
120 		 */
121 		return 0;
122 	}
123 
124 	/* data/mgmt */
125 	if (0 /* FIX: data/mgmt during CFP */)
126 		return cpu_to_le16(32768);
127 
128 	if (group_addr) /* Group address as the destination - no ACK */
129 		return 0;
130 
131 	/* Individual destination address:
132 	 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
133 	 * CTS and ACK frames shall be transmitted using the highest rate in
134 	 * basic rate set that is less than or equal to the rate of the
135 	 * immediately previous frame and that is using the same modulation
136 	 * (CCK or OFDM). If no basic rate set matches with these requirements,
137 	 * the highest mandatory rate of the PHY that is less than or equal to
138 	 * the rate of the previous frame is used.
139 	 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
140 	 */
141 	rate = -1;
142 	/* use lowest available if everything fails */
143 	mrate = sband->bitrates[0].bitrate;
144 	for (i = 0; i < sband->n_bitrates; i++) {
145 		struct ieee80211_rate *r = &sband->bitrates[i];
146 
147 		if (r->bitrate > txrate->bitrate)
148 			break;
149 
150 		if ((rate_flags & r->flags) != rate_flags)
151 			continue;
152 
153 		if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
154 			rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
155 
156 		switch (sband->band) {
157 		case NL80211_BAND_2GHZ: {
158 			u32 flag;
159 			if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
160 				flag = IEEE80211_RATE_MANDATORY_G;
161 			else
162 				flag = IEEE80211_RATE_MANDATORY_B;
163 			if (r->flags & flag)
164 				mrate = r->bitrate;
165 			break;
166 		}
167 		case NL80211_BAND_5GHZ:
168 			if (r->flags & IEEE80211_RATE_MANDATORY_A)
169 				mrate = r->bitrate;
170 			break;
171 		case NL80211_BAND_60GHZ:
172 			/* TODO, for now fall through */
173 		case NUM_NL80211_BANDS:
174 			WARN_ON(1);
175 			break;
176 		}
177 	}
178 	if (rate == -1) {
179 		/* No matching basic rate found; use highest suitable mandatory
180 		 * PHY rate */
181 		rate = DIV_ROUND_UP(mrate, 1 << shift);
182 	}
183 
184 	/* Don't calculate ACKs for QoS Frames with NoAck Policy set */
185 	if (ieee80211_is_data_qos(hdr->frame_control) &&
186 	    *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
187 		dur = 0;
188 	else
189 		/* Time needed to transmit ACK
190 		 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
191 		 * to closest integer */
192 		dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
193 				tx->sdata->vif.bss_conf.use_short_preamble,
194 				shift);
195 
196 	if (next_frag_len) {
197 		/* Frame is fragmented: duration increases with time needed to
198 		 * transmit next fragment plus ACK and 2 x SIFS. */
199 		dur *= 2; /* ACK + SIFS */
200 		/* next fragment */
201 		dur += ieee80211_frame_duration(sband->band, next_frag_len,
202 				txrate->bitrate, erp,
203 				tx->sdata->vif.bss_conf.use_short_preamble,
204 				shift);
205 	}
206 
207 	return cpu_to_le16(dur);
208 }
209 
210 /* tx handlers */
211 static ieee80211_tx_result debug_noinline
212 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
213 {
214 	struct ieee80211_local *local = tx->local;
215 	struct ieee80211_if_managed *ifmgd;
216 
217 	/* driver doesn't support power save */
218 	if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
219 		return TX_CONTINUE;
220 
221 	/* hardware does dynamic power save */
222 	if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
223 		return TX_CONTINUE;
224 
225 	/* dynamic power save disabled */
226 	if (local->hw.conf.dynamic_ps_timeout <= 0)
227 		return TX_CONTINUE;
228 
229 	/* we are scanning, don't enable power save */
230 	if (local->scanning)
231 		return TX_CONTINUE;
232 
233 	if (!local->ps_sdata)
234 		return TX_CONTINUE;
235 
236 	/* No point if we're going to suspend */
237 	if (local->quiescing)
238 		return TX_CONTINUE;
239 
240 	/* dynamic ps is supported only in managed mode */
241 	if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
242 		return TX_CONTINUE;
243 
244 	ifmgd = &tx->sdata->u.mgd;
245 
246 	/*
247 	 * Don't wakeup from power save if u-apsd is enabled, voip ac has
248 	 * u-apsd enabled and the frame is in voip class. This effectively
249 	 * means that even if all access categories have u-apsd enabled, in
250 	 * practise u-apsd is only used with the voip ac. This is a
251 	 * workaround for the case when received voip class packets do not
252 	 * have correct qos tag for some reason, due the network or the
253 	 * peer application.
254 	 *
255 	 * Note: ifmgd->uapsd_queues access is racy here. If the value is
256 	 * changed via debugfs, user needs to reassociate manually to have
257 	 * everything in sync.
258 	 */
259 	if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
260 	    (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
261 	    skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
262 		return TX_CONTINUE;
263 
264 	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
265 		ieee80211_stop_queues_by_reason(&local->hw,
266 						IEEE80211_MAX_QUEUE_MAP,
267 						IEEE80211_QUEUE_STOP_REASON_PS,
268 						false);
269 		ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
270 		ieee80211_queue_work(&local->hw,
271 				     &local->dynamic_ps_disable_work);
272 	}
273 
274 	/* Don't restart the timer if we're not disassociated */
275 	if (!ifmgd->associated)
276 		return TX_CONTINUE;
277 
278 	mod_timer(&local->dynamic_ps_timer, jiffies +
279 		  msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
280 
281 	return TX_CONTINUE;
282 }
283 
284 static ieee80211_tx_result debug_noinline
285 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
286 {
287 
288 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
289 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
290 	bool assoc = false;
291 
292 	if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
293 		return TX_CONTINUE;
294 
295 	if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
296 	    test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
297 	    !ieee80211_is_probe_req(hdr->frame_control) &&
298 	    !ieee80211_is_nullfunc(hdr->frame_control))
299 		/*
300 		 * When software scanning only nullfunc frames (to notify
301 		 * the sleep state to the AP) and probe requests (for the
302 		 * active scan) are allowed, all other frames should not be
303 		 * sent and we should not get here, but if we do
304 		 * nonetheless, drop them to avoid sending them
305 		 * off-channel. See the link below and
306 		 * ieee80211_start_scan() for more.
307 		 *
308 		 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
309 		 */
310 		return TX_DROP;
311 
312 	if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
313 		return TX_CONTINUE;
314 
315 	if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
316 		return TX_CONTINUE;
317 
318 	if (tx->flags & IEEE80211_TX_PS_BUFFERED)
319 		return TX_CONTINUE;
320 
321 	if (tx->sta)
322 		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
323 
324 	if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
325 		if (unlikely(!assoc &&
326 			     ieee80211_is_data(hdr->frame_control))) {
327 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
328 			sdata_info(tx->sdata,
329 				   "dropped data frame to not associated station %pM\n",
330 				   hdr->addr1);
331 #endif
332 			I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
333 			return TX_DROP;
334 		}
335 	} else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
336 			    ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
337 		/*
338 		 * No associated STAs - no need to send multicast
339 		 * frames.
340 		 */
341 		return TX_DROP;
342 	}
343 
344 	return TX_CONTINUE;
345 }
346 
347 /* This function is called whenever the AP is about to exceed the maximum limit
348  * of buffered frames for power saving STAs. This situation should not really
349  * happen often during normal operation, so dropping the oldest buffered packet
350  * from each queue should be OK to make some room for new frames. */
351 static void purge_old_ps_buffers(struct ieee80211_local *local)
352 {
353 	int total = 0, purged = 0;
354 	struct sk_buff *skb;
355 	struct ieee80211_sub_if_data *sdata;
356 	struct sta_info *sta;
357 
358 	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
359 		struct ps_data *ps;
360 
361 		if (sdata->vif.type == NL80211_IFTYPE_AP)
362 			ps = &sdata->u.ap.ps;
363 		else if (ieee80211_vif_is_mesh(&sdata->vif))
364 			ps = &sdata->u.mesh.ps;
365 		else
366 			continue;
367 
368 		skb = skb_dequeue(&ps->bc_buf);
369 		if (skb) {
370 			purged++;
371 			ieee80211_free_txskb(&local->hw, skb);
372 		}
373 		total += skb_queue_len(&ps->bc_buf);
374 	}
375 
376 	/*
377 	 * Drop one frame from each station from the lowest-priority
378 	 * AC that has frames at all.
379 	 */
380 	list_for_each_entry_rcu(sta, &local->sta_list, list) {
381 		int ac;
382 
383 		for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
384 			skb = skb_dequeue(&sta->ps_tx_buf[ac]);
385 			total += skb_queue_len(&sta->ps_tx_buf[ac]);
386 			if (skb) {
387 				purged++;
388 				ieee80211_free_txskb(&local->hw, skb);
389 				break;
390 			}
391 		}
392 	}
393 
394 	local->total_ps_buffered = total;
395 	ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
396 }
397 
398 static ieee80211_tx_result
399 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
400 {
401 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
402 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
403 	struct ps_data *ps;
404 
405 	/*
406 	 * broadcast/multicast frame
407 	 *
408 	 * If any of the associated/peer stations is in power save mode,
409 	 * the frame is buffered to be sent after DTIM beacon frame.
410 	 * This is done either by the hardware or us.
411 	 */
412 
413 	/* powersaving STAs currently only in AP/VLAN/mesh mode */
414 	if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
415 	    tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
416 		if (!tx->sdata->bss)
417 			return TX_CONTINUE;
418 
419 		ps = &tx->sdata->bss->ps;
420 	} else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
421 		ps = &tx->sdata->u.mesh.ps;
422 	} else {
423 		return TX_CONTINUE;
424 	}
425 
426 
427 	/* no buffering for ordered frames */
428 	if (ieee80211_has_order(hdr->frame_control))
429 		return TX_CONTINUE;
430 
431 	if (ieee80211_is_probe_req(hdr->frame_control))
432 		return TX_CONTINUE;
433 
434 	if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
435 		info->hw_queue = tx->sdata->vif.cab_queue;
436 
437 	/* no stations in PS mode */
438 	if (!atomic_read(&ps->num_sta_ps))
439 		return TX_CONTINUE;
440 
441 	info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
442 
443 	/* device releases frame after DTIM beacon */
444 	if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
445 		return TX_CONTINUE;
446 
447 	/* buffered in mac80211 */
448 	if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
449 		purge_old_ps_buffers(tx->local);
450 
451 	if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
452 		ps_dbg(tx->sdata,
453 		       "BC TX buffer full - dropping the oldest frame\n");
454 		ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
455 	} else
456 		tx->local->total_ps_buffered++;
457 
458 	skb_queue_tail(&ps->bc_buf, tx->skb);
459 
460 	return TX_QUEUED;
461 }
462 
463 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
464 			     struct sk_buff *skb)
465 {
466 	if (!ieee80211_is_mgmt(fc))
467 		return 0;
468 
469 	if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
470 		return 0;
471 
472 	if (!ieee80211_is_robust_mgmt_frame(skb))
473 		return 0;
474 
475 	return 1;
476 }
477 
478 static ieee80211_tx_result
479 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
480 {
481 	struct sta_info *sta = tx->sta;
482 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
483 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
484 	struct ieee80211_local *local = tx->local;
485 
486 	if (unlikely(!sta))
487 		return TX_CONTINUE;
488 
489 	if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
490 		      test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
491 		      test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
492 		     !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
493 		int ac = skb_get_queue_mapping(tx->skb);
494 
495 		if (ieee80211_is_mgmt(hdr->frame_control) &&
496 		    !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
497 			info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
498 			return TX_CONTINUE;
499 		}
500 
501 		ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
502 		       sta->sta.addr, sta->sta.aid, ac);
503 		if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
504 			purge_old_ps_buffers(tx->local);
505 
506 		/* sync with ieee80211_sta_ps_deliver_wakeup */
507 		spin_lock(&sta->ps_lock);
508 		/*
509 		 * STA woke up the meantime and all the frames on ps_tx_buf have
510 		 * been queued to pending queue. No reordering can happen, go
511 		 * ahead and Tx the packet.
512 		 */
513 		if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
514 		    !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
515 		    !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
516 			spin_unlock(&sta->ps_lock);
517 			return TX_CONTINUE;
518 		}
519 
520 		if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
521 			struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
522 			ps_dbg(tx->sdata,
523 			       "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
524 			       sta->sta.addr, ac);
525 			ieee80211_free_txskb(&local->hw, old);
526 		} else
527 			tx->local->total_ps_buffered++;
528 
529 		info->control.jiffies = jiffies;
530 		info->control.vif = &tx->sdata->vif;
531 		info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
532 		info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
533 		skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
534 		spin_unlock(&sta->ps_lock);
535 
536 		if (!timer_pending(&local->sta_cleanup))
537 			mod_timer(&local->sta_cleanup,
538 				  round_jiffies(jiffies +
539 						STA_INFO_CLEANUP_INTERVAL));
540 
541 		/*
542 		 * We queued up some frames, so the TIM bit might
543 		 * need to be set, recalculate it.
544 		 */
545 		sta_info_recalc_tim(sta);
546 
547 		return TX_QUEUED;
548 	} else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
549 		ps_dbg(tx->sdata,
550 		       "STA %pM in PS mode, but polling/in SP -> send frame\n",
551 		       sta->sta.addr);
552 	}
553 
554 	return TX_CONTINUE;
555 }
556 
557 static ieee80211_tx_result debug_noinline
558 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
559 {
560 	if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
561 		return TX_CONTINUE;
562 
563 	if (tx->flags & IEEE80211_TX_UNICAST)
564 		return ieee80211_tx_h_unicast_ps_buf(tx);
565 	else
566 		return ieee80211_tx_h_multicast_ps_buf(tx);
567 }
568 
569 static ieee80211_tx_result debug_noinline
570 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
571 {
572 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
573 
574 	if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
575 		if (tx->sdata->control_port_no_encrypt)
576 			info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
577 		info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
578 		info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
579 	}
580 
581 	return TX_CONTINUE;
582 }
583 
584 static ieee80211_tx_result debug_noinline
585 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
586 {
587 	struct ieee80211_key *key;
588 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
589 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
590 
591 	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
592 		tx->key = NULL;
593 	else if (tx->sta &&
594 		 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
595 		tx->key = key;
596 	else if (ieee80211_is_group_privacy_action(tx->skb) &&
597 		(key = rcu_dereference(tx->sdata->default_multicast_key)))
598 		tx->key = key;
599 	else if (ieee80211_is_mgmt(hdr->frame_control) &&
600 		 is_multicast_ether_addr(hdr->addr1) &&
601 		 ieee80211_is_robust_mgmt_frame(tx->skb) &&
602 		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
603 		tx->key = key;
604 	else if (is_multicast_ether_addr(hdr->addr1) &&
605 		 (key = rcu_dereference(tx->sdata->default_multicast_key)))
606 		tx->key = key;
607 	else if (!is_multicast_ether_addr(hdr->addr1) &&
608 		 (key = rcu_dereference(tx->sdata->default_unicast_key)))
609 		tx->key = key;
610 	else
611 		tx->key = NULL;
612 
613 	if (tx->key) {
614 		bool skip_hw = false;
615 
616 		/* TODO: add threshold stuff again */
617 
618 		switch (tx->key->conf.cipher) {
619 		case WLAN_CIPHER_SUITE_WEP40:
620 		case WLAN_CIPHER_SUITE_WEP104:
621 		case WLAN_CIPHER_SUITE_TKIP:
622 			if (!ieee80211_is_data_present(hdr->frame_control))
623 				tx->key = NULL;
624 			break;
625 		case WLAN_CIPHER_SUITE_CCMP:
626 		case WLAN_CIPHER_SUITE_CCMP_256:
627 		case WLAN_CIPHER_SUITE_GCMP:
628 		case WLAN_CIPHER_SUITE_GCMP_256:
629 			if (!ieee80211_is_data_present(hdr->frame_control) &&
630 			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
631 					       tx->skb) &&
632 			    !ieee80211_is_group_privacy_action(tx->skb))
633 				tx->key = NULL;
634 			else
635 				skip_hw = (tx->key->conf.flags &
636 					   IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
637 					ieee80211_is_mgmt(hdr->frame_control);
638 			break;
639 		case WLAN_CIPHER_SUITE_AES_CMAC:
640 		case WLAN_CIPHER_SUITE_BIP_CMAC_256:
641 		case WLAN_CIPHER_SUITE_BIP_GMAC_128:
642 		case WLAN_CIPHER_SUITE_BIP_GMAC_256:
643 			if (!ieee80211_is_mgmt(hdr->frame_control))
644 				tx->key = NULL;
645 			break;
646 		}
647 
648 		if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
649 			     !ieee80211_is_deauth(hdr->frame_control)))
650 			return TX_DROP;
651 
652 		if (!skip_hw && tx->key &&
653 		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
654 			info->control.hw_key = &tx->key->conf;
655 	}
656 
657 	return TX_CONTINUE;
658 }
659 
660 static ieee80211_tx_result debug_noinline
661 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
662 {
663 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
664 	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
665 	struct ieee80211_supported_band *sband;
666 	u32 len;
667 	struct ieee80211_tx_rate_control txrc;
668 	struct ieee80211_sta_rates *ratetbl = NULL;
669 	bool assoc = false;
670 
671 	memset(&txrc, 0, sizeof(txrc));
672 
673 	sband = tx->local->hw.wiphy->bands[info->band];
674 
675 	len = min_t(u32, tx->skb->len + FCS_LEN,
676 			 tx->local->hw.wiphy->frag_threshold);
677 
678 	/* set up the tx rate control struct we give the RC algo */
679 	txrc.hw = &tx->local->hw;
680 	txrc.sband = sband;
681 	txrc.bss_conf = &tx->sdata->vif.bss_conf;
682 	txrc.skb = tx->skb;
683 	txrc.reported_rate.idx = -1;
684 	txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
685 
686 	if (tx->sdata->rc_has_mcs_mask[info->band])
687 		txrc.rate_idx_mcs_mask =
688 			tx->sdata->rc_rateidx_mcs_mask[info->band];
689 
690 	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
691 		    tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
692 		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
693 		    tx->sdata->vif.type == NL80211_IFTYPE_OCB);
694 
695 	/* set up RTS protection if desired */
696 	if (len > tx->local->hw.wiphy->rts_threshold) {
697 		txrc.rts = true;
698 	}
699 
700 	info->control.use_rts = txrc.rts;
701 	info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
702 
703 	/*
704 	 * Use short preamble if the BSS can handle it, but not for
705 	 * management frames unless we know the receiver can handle
706 	 * that -- the management frame might be to a station that
707 	 * just wants a probe response.
708 	 */
709 	if (tx->sdata->vif.bss_conf.use_short_preamble &&
710 	    (ieee80211_is_data(hdr->frame_control) ||
711 	     (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
712 		txrc.short_preamble = true;
713 
714 	info->control.short_preamble = txrc.short_preamble;
715 
716 	/* don't ask rate control when rate already injected via radiotap */
717 	if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
718 		return TX_CONTINUE;
719 
720 	if (tx->sta)
721 		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
722 
723 	/*
724 	 * Lets not bother rate control if we're associated and cannot
725 	 * talk to the sta. This should not happen.
726 	 */
727 	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
728 		 !rate_usable_index_exists(sband, &tx->sta->sta),
729 		 "%s: Dropped data frame as no usable bitrate found while "
730 		 "scanning and associated. Target station: "
731 		 "%pM on %d GHz band\n",
732 		 tx->sdata->name, hdr->addr1,
733 		 info->band ? 5 : 2))
734 		return TX_DROP;
735 
736 	/*
737 	 * If we're associated with the sta at this point we know we can at
738 	 * least send the frame at the lowest bit rate.
739 	 */
740 	rate_control_get_rate(tx->sdata, tx->sta, &txrc);
741 
742 	if (tx->sta && !info->control.skip_table)
743 		ratetbl = rcu_dereference(tx->sta->sta.rates);
744 
745 	if (unlikely(info->control.rates[0].idx < 0)) {
746 		if (ratetbl) {
747 			struct ieee80211_tx_rate rate = {
748 				.idx = ratetbl->rate[0].idx,
749 				.flags = ratetbl->rate[0].flags,
750 				.count = ratetbl->rate[0].count
751 			};
752 
753 			if (ratetbl->rate[0].idx < 0)
754 				return TX_DROP;
755 
756 			tx->rate = rate;
757 		} else {
758 			return TX_DROP;
759 		}
760 	} else {
761 		tx->rate = info->control.rates[0];
762 	}
763 
764 	if (txrc.reported_rate.idx < 0) {
765 		txrc.reported_rate = tx->rate;
766 		if (tx->sta && ieee80211_is_data(hdr->frame_control))
767 			tx->sta->tx_stats.last_rate = txrc.reported_rate;
768 	} else if (tx->sta)
769 		tx->sta->tx_stats.last_rate = txrc.reported_rate;
770 
771 	if (ratetbl)
772 		return TX_CONTINUE;
773 
774 	if (unlikely(!info->control.rates[0].count))
775 		info->control.rates[0].count = 1;
776 
777 	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
778 			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
779 		info->control.rates[0].count = 1;
780 
781 	return TX_CONTINUE;
782 }
783 
784 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
785 {
786 	u16 *seq = &sta->tid_seq[tid];
787 	__le16 ret = cpu_to_le16(*seq);
788 
789 	/* Increase the sequence number. */
790 	*seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
791 
792 	return ret;
793 }
794 
795 static ieee80211_tx_result debug_noinline
796 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
797 {
798 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
799 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
800 	u8 *qc;
801 	int tid;
802 
803 	/*
804 	 * Packet injection may want to control the sequence
805 	 * number, if we have no matching interface then we
806 	 * neither assign one ourselves nor ask the driver to.
807 	 */
808 	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
809 		return TX_CONTINUE;
810 
811 	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
812 		return TX_CONTINUE;
813 
814 	if (ieee80211_hdrlen(hdr->frame_control) < 24)
815 		return TX_CONTINUE;
816 
817 	if (ieee80211_is_qos_nullfunc(hdr->frame_control))
818 		return TX_CONTINUE;
819 
820 	/*
821 	 * Anything but QoS data that has a sequence number field
822 	 * (is long enough) gets a sequence number from the global
823 	 * counter.  QoS data frames with a multicast destination
824 	 * also use the global counter (802.11-2012 9.3.2.10).
825 	 */
826 	if (!ieee80211_is_data_qos(hdr->frame_control) ||
827 	    is_multicast_ether_addr(hdr->addr1)) {
828 		/* driver should assign sequence number */
829 		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
830 		/* for pure STA mode without beacons, we can do it */
831 		hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
832 		tx->sdata->sequence_number += 0x10;
833 		if (tx->sta)
834 			tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
835 		return TX_CONTINUE;
836 	}
837 
838 	/*
839 	 * This should be true for injected/management frames only, for
840 	 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
841 	 * above since they are not QoS-data frames.
842 	 */
843 	if (!tx->sta)
844 		return TX_CONTINUE;
845 
846 	/* include per-STA, per-TID sequence counter */
847 
848 	qc = ieee80211_get_qos_ctl(hdr);
849 	tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
850 	tx->sta->tx_stats.msdu[tid]++;
851 
852 	hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
853 
854 	return TX_CONTINUE;
855 }
856 
857 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
858 			      struct sk_buff *skb, int hdrlen,
859 			      int frag_threshold)
860 {
861 	struct ieee80211_local *local = tx->local;
862 	struct ieee80211_tx_info *info;
863 	struct sk_buff *tmp;
864 	int per_fragm = frag_threshold - hdrlen - FCS_LEN;
865 	int pos = hdrlen + per_fragm;
866 	int rem = skb->len - hdrlen - per_fragm;
867 
868 	if (WARN_ON(rem < 0))
869 		return -EINVAL;
870 
871 	/* first fragment was already added to queue by caller */
872 
873 	while (rem) {
874 		int fraglen = per_fragm;
875 
876 		if (fraglen > rem)
877 			fraglen = rem;
878 		rem -= fraglen;
879 		tmp = dev_alloc_skb(local->tx_headroom +
880 				    frag_threshold +
881 				    tx->sdata->encrypt_headroom +
882 				    IEEE80211_ENCRYPT_TAILROOM);
883 		if (!tmp)
884 			return -ENOMEM;
885 
886 		__skb_queue_tail(&tx->skbs, tmp);
887 
888 		skb_reserve(tmp,
889 			    local->tx_headroom + tx->sdata->encrypt_headroom);
890 
891 		/* copy control information */
892 		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
893 
894 		info = IEEE80211_SKB_CB(tmp);
895 		info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
896 				 IEEE80211_TX_CTL_FIRST_FRAGMENT);
897 
898 		if (rem)
899 			info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
900 
901 		skb_copy_queue_mapping(tmp, skb);
902 		tmp->priority = skb->priority;
903 		tmp->dev = skb->dev;
904 
905 		/* copy header and data */
906 		skb_put_data(tmp, skb->data, hdrlen);
907 		skb_put_data(tmp, skb->data + pos, fraglen);
908 
909 		pos += fraglen;
910 	}
911 
912 	/* adjust first fragment's length */
913 	skb_trim(skb, hdrlen + per_fragm);
914 	return 0;
915 }
916 
917 static ieee80211_tx_result debug_noinline
918 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
919 {
920 	struct sk_buff *skb = tx->skb;
921 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
922 	struct ieee80211_hdr *hdr = (void *)skb->data;
923 	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
924 	int hdrlen;
925 	int fragnum;
926 
927 	/* no matter what happens, tx->skb moves to tx->skbs */
928 	__skb_queue_tail(&tx->skbs, skb);
929 	tx->skb = NULL;
930 
931 	if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
932 		return TX_CONTINUE;
933 
934 	if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
935 		return TX_CONTINUE;
936 
937 	/*
938 	 * Warn when submitting a fragmented A-MPDU frame and drop it.
939 	 * This scenario is handled in ieee80211_tx_prepare but extra
940 	 * caution taken here as fragmented ampdu may cause Tx stop.
941 	 */
942 	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
943 		return TX_DROP;
944 
945 	hdrlen = ieee80211_hdrlen(hdr->frame_control);
946 
947 	/* internal error, why isn't DONTFRAG set? */
948 	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
949 		return TX_DROP;
950 
951 	/*
952 	 * Now fragment the frame. This will allocate all the fragments and
953 	 * chain them (using skb as the first fragment) to skb->next.
954 	 * During transmission, we will remove the successfully transmitted
955 	 * fragments from this list. When the low-level driver rejects one
956 	 * of the fragments then we will simply pretend to accept the skb
957 	 * but store it away as pending.
958 	 */
959 	if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
960 		return TX_DROP;
961 
962 	/* update duration/seq/flags of fragments */
963 	fragnum = 0;
964 
965 	skb_queue_walk(&tx->skbs, skb) {
966 		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
967 
968 		hdr = (void *)skb->data;
969 		info = IEEE80211_SKB_CB(skb);
970 
971 		if (!skb_queue_is_last(&tx->skbs, skb)) {
972 			hdr->frame_control |= morefrags;
973 			/*
974 			 * No multi-rate retries for fragmented frames, that
975 			 * would completely throw off the NAV at other STAs.
976 			 */
977 			info->control.rates[1].idx = -1;
978 			info->control.rates[2].idx = -1;
979 			info->control.rates[3].idx = -1;
980 			BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
981 			info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
982 		} else {
983 			hdr->frame_control &= ~morefrags;
984 		}
985 		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
986 		fragnum++;
987 	}
988 
989 	return TX_CONTINUE;
990 }
991 
992 static ieee80211_tx_result debug_noinline
993 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
994 {
995 	struct sk_buff *skb;
996 	int ac = -1;
997 
998 	if (!tx->sta)
999 		return TX_CONTINUE;
1000 
1001 	skb_queue_walk(&tx->skbs, skb) {
1002 		ac = skb_get_queue_mapping(skb);
1003 		tx->sta->tx_stats.bytes[ac] += skb->len;
1004 	}
1005 	if (ac >= 0)
1006 		tx->sta->tx_stats.packets[ac]++;
1007 
1008 	return TX_CONTINUE;
1009 }
1010 
1011 static ieee80211_tx_result debug_noinline
1012 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1013 {
1014 	if (!tx->key)
1015 		return TX_CONTINUE;
1016 
1017 	switch (tx->key->conf.cipher) {
1018 	case WLAN_CIPHER_SUITE_WEP40:
1019 	case WLAN_CIPHER_SUITE_WEP104:
1020 		return ieee80211_crypto_wep_encrypt(tx);
1021 	case WLAN_CIPHER_SUITE_TKIP:
1022 		return ieee80211_crypto_tkip_encrypt(tx);
1023 	case WLAN_CIPHER_SUITE_CCMP:
1024 		return ieee80211_crypto_ccmp_encrypt(
1025 			tx, IEEE80211_CCMP_MIC_LEN);
1026 	case WLAN_CIPHER_SUITE_CCMP_256:
1027 		return ieee80211_crypto_ccmp_encrypt(
1028 			tx, IEEE80211_CCMP_256_MIC_LEN);
1029 	case WLAN_CIPHER_SUITE_AES_CMAC:
1030 		return ieee80211_crypto_aes_cmac_encrypt(tx);
1031 	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1032 		return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1033 	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1034 	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1035 		return ieee80211_crypto_aes_gmac_encrypt(tx);
1036 	case WLAN_CIPHER_SUITE_GCMP:
1037 	case WLAN_CIPHER_SUITE_GCMP_256:
1038 		return ieee80211_crypto_gcmp_encrypt(tx);
1039 	default:
1040 		return ieee80211_crypto_hw_encrypt(tx);
1041 	}
1042 
1043 	return TX_DROP;
1044 }
1045 
1046 static ieee80211_tx_result debug_noinline
1047 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1048 {
1049 	struct sk_buff *skb;
1050 	struct ieee80211_hdr *hdr;
1051 	int next_len;
1052 	bool group_addr;
1053 
1054 	skb_queue_walk(&tx->skbs, skb) {
1055 		hdr = (void *) skb->data;
1056 		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1057 			break; /* must not overwrite AID */
1058 		if (!skb_queue_is_last(&tx->skbs, skb)) {
1059 			struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1060 			next_len = next->len;
1061 		} else
1062 			next_len = 0;
1063 		group_addr = is_multicast_ether_addr(hdr->addr1);
1064 
1065 		hdr->duration_id =
1066 			ieee80211_duration(tx, skb, group_addr, next_len);
1067 	}
1068 
1069 	return TX_CONTINUE;
1070 }
1071 
1072 /* actual transmit path */
1073 
1074 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1075 				  struct sk_buff *skb,
1076 				  struct ieee80211_tx_info *info,
1077 				  struct tid_ampdu_tx *tid_tx,
1078 				  int tid)
1079 {
1080 	bool queued = false;
1081 	bool reset_agg_timer = false;
1082 	struct sk_buff *purge_skb = NULL;
1083 
1084 	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1085 		info->flags |= IEEE80211_TX_CTL_AMPDU;
1086 		reset_agg_timer = true;
1087 	} else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1088 		/*
1089 		 * nothing -- this aggregation session is being started
1090 		 * but that might still fail with the driver
1091 		 */
1092 	} else if (!tx->sta->sta.txq[tid]) {
1093 		spin_lock(&tx->sta->lock);
1094 		/*
1095 		 * Need to re-check now, because we may get here
1096 		 *
1097 		 *  1) in the window during which the setup is actually
1098 		 *     already done, but not marked yet because not all
1099 		 *     packets are spliced over to the driver pending
1100 		 *     queue yet -- if this happened we acquire the lock
1101 		 *     either before or after the splice happens, but
1102 		 *     need to recheck which of these cases happened.
1103 		 *
1104 		 *  2) during session teardown, if the OPERATIONAL bit
1105 		 *     was cleared due to the teardown but the pointer
1106 		 *     hasn't been assigned NULL yet (or we loaded it
1107 		 *     before it was assigned) -- in this case it may
1108 		 *     now be NULL which means we should just let the
1109 		 *     packet pass through because splicing the frames
1110 		 *     back is already done.
1111 		 */
1112 		tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1113 
1114 		if (!tid_tx) {
1115 			/* do nothing, let packet pass through */
1116 		} else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1117 			info->flags |= IEEE80211_TX_CTL_AMPDU;
1118 			reset_agg_timer = true;
1119 		} else {
1120 			queued = true;
1121 			if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1122 				clear_sta_flag(tx->sta, WLAN_STA_SP);
1123 				ps_dbg(tx->sta->sdata,
1124 				       "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1125 				       tx->sta->sta.addr, tx->sta->sta.aid);
1126 			}
1127 			info->control.vif = &tx->sdata->vif;
1128 			info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1129 			info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1130 			__skb_queue_tail(&tid_tx->pending, skb);
1131 			if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1132 				purge_skb = __skb_dequeue(&tid_tx->pending);
1133 		}
1134 		spin_unlock(&tx->sta->lock);
1135 
1136 		if (purge_skb)
1137 			ieee80211_free_txskb(&tx->local->hw, purge_skb);
1138 	}
1139 
1140 	/* reset session timer */
1141 	if (reset_agg_timer && tid_tx->timeout)
1142 		tid_tx->last_tx = jiffies;
1143 
1144 	return queued;
1145 }
1146 
1147 /*
1148  * initialises @tx
1149  * pass %NULL for the station if unknown, a valid pointer if known
1150  * or an ERR_PTR() if the station is known not to exist
1151  */
1152 static ieee80211_tx_result
1153 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1154 		     struct ieee80211_tx_data *tx,
1155 		     struct sta_info *sta, struct sk_buff *skb)
1156 {
1157 	struct ieee80211_local *local = sdata->local;
1158 	struct ieee80211_hdr *hdr;
1159 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1160 	int tid;
1161 	u8 *qc;
1162 
1163 	memset(tx, 0, sizeof(*tx));
1164 	tx->skb = skb;
1165 	tx->local = local;
1166 	tx->sdata = sdata;
1167 	__skb_queue_head_init(&tx->skbs);
1168 
1169 	/*
1170 	 * If this flag is set to true anywhere, and we get here,
1171 	 * we are doing the needed processing, so remove the flag
1172 	 * now.
1173 	 */
1174 	info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1175 
1176 	hdr = (struct ieee80211_hdr *) skb->data;
1177 
1178 	if (likely(sta)) {
1179 		if (!IS_ERR(sta))
1180 			tx->sta = sta;
1181 	} else {
1182 		if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1183 			tx->sta = rcu_dereference(sdata->u.vlan.sta);
1184 			if (!tx->sta && sdata->wdev.use_4addr)
1185 				return TX_DROP;
1186 		} else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1187 					  IEEE80211_TX_CTL_INJECTED) ||
1188 			   tx->sdata->control_port_protocol == tx->skb->protocol) {
1189 			tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1190 		}
1191 		if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1192 			tx->sta = sta_info_get(sdata, hdr->addr1);
1193 	}
1194 
1195 	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1196 	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1197 	    ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1198 	    !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1199 		struct tid_ampdu_tx *tid_tx;
1200 
1201 		qc = ieee80211_get_qos_ctl(hdr);
1202 		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1203 
1204 		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1205 		if (tid_tx) {
1206 			bool queued;
1207 
1208 			queued = ieee80211_tx_prep_agg(tx, skb, info,
1209 						       tid_tx, tid);
1210 
1211 			if (unlikely(queued))
1212 				return TX_QUEUED;
1213 		}
1214 	}
1215 
1216 	if (is_multicast_ether_addr(hdr->addr1)) {
1217 		tx->flags &= ~IEEE80211_TX_UNICAST;
1218 		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1219 	} else
1220 		tx->flags |= IEEE80211_TX_UNICAST;
1221 
1222 	if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1223 		if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1224 		    skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1225 		    info->flags & IEEE80211_TX_CTL_AMPDU)
1226 			info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1227 	}
1228 
1229 	if (!tx->sta)
1230 		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1231 	else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1232 		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1233 		ieee80211_check_fast_xmit(tx->sta);
1234 	}
1235 
1236 	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1237 
1238 	return TX_CONTINUE;
1239 }
1240 
1241 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1242 					  struct ieee80211_vif *vif,
1243 					  struct sta_info *sta,
1244 					  struct sk_buff *skb)
1245 {
1246 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1247 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1248 	struct ieee80211_txq *txq = NULL;
1249 
1250 	if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1251 	    (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1252 		return NULL;
1253 
1254 	if (!ieee80211_is_data(hdr->frame_control))
1255 		return NULL;
1256 
1257 	if (sta) {
1258 		u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1259 
1260 		if (!sta->uploaded)
1261 			return NULL;
1262 
1263 		txq = sta->sta.txq[tid];
1264 	} else if (vif) {
1265 		txq = vif->txq;
1266 	}
1267 
1268 	if (!txq)
1269 		return NULL;
1270 
1271 	return to_txq_info(txq);
1272 }
1273 
1274 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1275 {
1276 	IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1277 }
1278 
1279 static void ieee80211_set_skb_vif(struct sk_buff *skb, struct txq_info *txqi)
1280 {
1281 	IEEE80211_SKB_CB(skb)->control.vif = txqi->txq.vif;
1282 }
1283 
1284 static u32 codel_skb_len_func(const struct sk_buff *skb)
1285 {
1286 	return skb->len;
1287 }
1288 
1289 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1290 {
1291 	const struct ieee80211_tx_info *info;
1292 
1293 	info = (const struct ieee80211_tx_info *)skb->cb;
1294 	return info->control.enqueue_time;
1295 }
1296 
1297 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1298 					  void *ctx)
1299 {
1300 	struct ieee80211_local *local;
1301 	struct txq_info *txqi;
1302 	struct fq *fq;
1303 	struct fq_flow *flow;
1304 
1305 	txqi = ctx;
1306 	local = vif_to_sdata(txqi->txq.vif)->local;
1307 	fq = &local->fq;
1308 
1309 	if (cvars == &txqi->def_cvars)
1310 		flow = &txqi->def_flow;
1311 	else
1312 		flow = &fq->flows[cvars - local->cvars];
1313 
1314 	return fq_flow_dequeue(fq, flow);
1315 }
1316 
1317 static void codel_drop_func(struct sk_buff *skb,
1318 			    void *ctx)
1319 {
1320 	struct ieee80211_local *local;
1321 	struct ieee80211_hw *hw;
1322 	struct txq_info *txqi;
1323 
1324 	txqi = ctx;
1325 	local = vif_to_sdata(txqi->txq.vif)->local;
1326 	hw = &local->hw;
1327 
1328 	ieee80211_free_txskb(hw, skb);
1329 }
1330 
1331 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1332 					   struct fq_tin *tin,
1333 					   struct fq_flow *flow)
1334 {
1335 	struct ieee80211_local *local;
1336 	struct txq_info *txqi;
1337 	struct codel_vars *cvars;
1338 	struct codel_params *cparams;
1339 	struct codel_stats *cstats;
1340 
1341 	local = container_of(fq, struct ieee80211_local, fq);
1342 	txqi = container_of(tin, struct txq_info, tin);
1343 	cstats = &txqi->cstats;
1344 
1345 	if (txqi->txq.sta) {
1346 		struct sta_info *sta = container_of(txqi->txq.sta,
1347 						    struct sta_info, sta);
1348 		cparams = &sta->cparams;
1349 	} else {
1350 		cparams = &local->cparams;
1351 	}
1352 
1353 	if (flow == &txqi->def_flow)
1354 		cvars = &txqi->def_cvars;
1355 	else
1356 		cvars = &local->cvars[flow - fq->flows];
1357 
1358 	return codel_dequeue(txqi,
1359 			     &flow->backlog,
1360 			     cparams,
1361 			     cvars,
1362 			     cstats,
1363 			     codel_skb_len_func,
1364 			     codel_skb_time_func,
1365 			     codel_drop_func,
1366 			     codel_dequeue_func);
1367 }
1368 
1369 static void fq_skb_free_func(struct fq *fq,
1370 			     struct fq_tin *tin,
1371 			     struct fq_flow *flow,
1372 			     struct sk_buff *skb)
1373 {
1374 	struct ieee80211_local *local;
1375 
1376 	local = container_of(fq, struct ieee80211_local, fq);
1377 	ieee80211_free_txskb(&local->hw, skb);
1378 }
1379 
1380 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1381 						struct fq_tin *tin,
1382 						int idx,
1383 						struct sk_buff *skb)
1384 {
1385 	struct txq_info *txqi;
1386 
1387 	txqi = container_of(tin, struct txq_info, tin);
1388 	return &txqi->def_flow;
1389 }
1390 
1391 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1392 				  struct txq_info *txqi,
1393 				  struct sk_buff *skb)
1394 {
1395 	struct fq *fq = &local->fq;
1396 	struct fq_tin *tin = &txqi->tin;
1397 
1398 	ieee80211_set_skb_enqueue_time(skb);
1399 	fq_tin_enqueue(fq, tin, skb,
1400 		       fq_skb_free_func,
1401 		       fq_flow_get_default_func);
1402 }
1403 
1404 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1405 			struct sta_info *sta,
1406 			struct txq_info *txqi, int tid)
1407 {
1408 	fq_tin_init(&txqi->tin);
1409 	fq_flow_init(&txqi->def_flow);
1410 	codel_vars_init(&txqi->def_cvars);
1411 	codel_stats_init(&txqi->cstats);
1412 	__skb_queue_head_init(&txqi->frags);
1413 
1414 	txqi->txq.vif = &sdata->vif;
1415 
1416 	if (sta) {
1417 		txqi->txq.sta = &sta->sta;
1418 		sta->sta.txq[tid] = &txqi->txq;
1419 		txqi->txq.tid = tid;
1420 		txqi->txq.ac = ieee80211_ac_from_tid(tid);
1421 	} else {
1422 		sdata->vif.txq = &txqi->txq;
1423 		txqi->txq.tid = 0;
1424 		txqi->txq.ac = IEEE80211_AC_BE;
1425 	}
1426 }
1427 
1428 void ieee80211_txq_purge(struct ieee80211_local *local,
1429 			 struct txq_info *txqi)
1430 {
1431 	struct fq *fq = &local->fq;
1432 	struct fq_tin *tin = &txqi->tin;
1433 
1434 	fq_tin_reset(fq, tin, fq_skb_free_func);
1435 	ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1436 }
1437 
1438 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1439 {
1440 	struct fq *fq = &local->fq;
1441 	int ret;
1442 	int i;
1443 	bool supp_vht = false;
1444 	enum nl80211_band band;
1445 
1446 	if (!local->ops->wake_tx_queue)
1447 		return 0;
1448 
1449 	ret = fq_init(fq, 4096);
1450 	if (ret)
1451 		return ret;
1452 
1453 	/*
1454 	 * If the hardware doesn't support VHT, it is safe to limit the maximum
1455 	 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1456 	 */
1457 	for (band = 0; band < NUM_NL80211_BANDS; band++) {
1458 		struct ieee80211_supported_band *sband;
1459 
1460 		sband = local->hw.wiphy->bands[band];
1461 		if (!sband)
1462 			continue;
1463 
1464 		supp_vht = supp_vht || sband->vht_cap.vht_supported;
1465 	}
1466 
1467 	if (!supp_vht)
1468 		fq->memory_limit = 4 << 20; /* 4 Mbytes */
1469 
1470 	codel_params_init(&local->cparams);
1471 	local->cparams.interval = MS2TIME(100);
1472 	local->cparams.target = MS2TIME(20);
1473 	local->cparams.ecn = true;
1474 
1475 	local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1476 			       GFP_KERNEL);
1477 	if (!local->cvars) {
1478 		spin_lock_bh(&fq->lock);
1479 		fq_reset(fq, fq_skb_free_func);
1480 		spin_unlock_bh(&fq->lock);
1481 		return -ENOMEM;
1482 	}
1483 
1484 	for (i = 0; i < fq->flows_cnt; i++)
1485 		codel_vars_init(&local->cvars[i]);
1486 
1487 	return 0;
1488 }
1489 
1490 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1491 {
1492 	struct fq *fq = &local->fq;
1493 
1494 	if (!local->ops->wake_tx_queue)
1495 		return;
1496 
1497 	kfree(local->cvars);
1498 	local->cvars = NULL;
1499 
1500 	spin_lock_bh(&fq->lock);
1501 	fq_reset(fq, fq_skb_free_func);
1502 	spin_unlock_bh(&fq->lock);
1503 }
1504 
1505 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1506 				struct ieee80211_sub_if_data *sdata,
1507 				struct sta_info *sta,
1508 				struct sk_buff *skb)
1509 {
1510 	struct fq *fq = &local->fq;
1511 	struct ieee80211_vif *vif;
1512 	struct txq_info *txqi;
1513 
1514 	if (!local->ops->wake_tx_queue ||
1515 	    sdata->vif.type == NL80211_IFTYPE_MONITOR)
1516 		return false;
1517 
1518 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1519 		sdata = container_of(sdata->bss,
1520 				     struct ieee80211_sub_if_data, u.ap);
1521 
1522 	vif = &sdata->vif;
1523 	txqi = ieee80211_get_txq(local, vif, sta, skb);
1524 
1525 	if (!txqi)
1526 		return false;
1527 
1528 	spin_lock_bh(&fq->lock);
1529 	ieee80211_txq_enqueue(local, txqi, skb);
1530 	spin_unlock_bh(&fq->lock);
1531 
1532 	drv_wake_tx_queue(local, txqi);
1533 
1534 	return true;
1535 }
1536 
1537 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1538 			       struct ieee80211_vif *vif,
1539 			       struct ieee80211_sta *sta,
1540 			       struct sk_buff_head *skbs,
1541 			       bool txpending)
1542 {
1543 	struct ieee80211_tx_control control = {};
1544 	struct sk_buff *skb, *tmp;
1545 	unsigned long flags;
1546 
1547 	skb_queue_walk_safe(skbs, skb, tmp) {
1548 		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1549 		int q = info->hw_queue;
1550 
1551 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1552 		if (WARN_ON_ONCE(q >= local->hw.queues)) {
1553 			__skb_unlink(skb, skbs);
1554 			ieee80211_free_txskb(&local->hw, skb);
1555 			continue;
1556 		}
1557 #endif
1558 
1559 		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1560 		if (local->queue_stop_reasons[q] ||
1561 		    (!txpending && !skb_queue_empty(&local->pending[q]))) {
1562 			if (unlikely(info->flags &
1563 				     IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1564 				if (local->queue_stop_reasons[q] &
1565 				    ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1566 					/*
1567 					 * Drop off-channel frames if queues
1568 					 * are stopped for any reason other
1569 					 * than off-channel operation. Never
1570 					 * queue them.
1571 					 */
1572 					spin_unlock_irqrestore(
1573 						&local->queue_stop_reason_lock,
1574 						flags);
1575 					ieee80211_purge_tx_queue(&local->hw,
1576 								 skbs);
1577 					return true;
1578 				}
1579 			} else {
1580 
1581 				/*
1582 				 * Since queue is stopped, queue up frames for
1583 				 * later transmission from the tx-pending
1584 				 * tasklet when the queue is woken again.
1585 				 */
1586 				if (txpending)
1587 					skb_queue_splice_init(skbs,
1588 							      &local->pending[q]);
1589 				else
1590 					skb_queue_splice_tail_init(skbs,
1591 								   &local->pending[q]);
1592 
1593 				spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1594 						       flags);
1595 				return false;
1596 			}
1597 		}
1598 		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1599 
1600 		info->control.vif = vif;
1601 		control.sta = sta;
1602 
1603 		__skb_unlink(skb, skbs);
1604 		drv_tx(local, &control, skb);
1605 	}
1606 
1607 	return true;
1608 }
1609 
1610 /*
1611  * Returns false if the frame couldn't be transmitted but was queued instead.
1612  */
1613 static bool __ieee80211_tx(struct ieee80211_local *local,
1614 			   struct sk_buff_head *skbs, int led_len,
1615 			   struct sta_info *sta, bool txpending)
1616 {
1617 	struct ieee80211_tx_info *info;
1618 	struct ieee80211_sub_if_data *sdata;
1619 	struct ieee80211_vif *vif;
1620 	struct ieee80211_sta *pubsta;
1621 	struct sk_buff *skb;
1622 	bool result = true;
1623 	__le16 fc;
1624 
1625 	if (WARN_ON(skb_queue_empty(skbs)))
1626 		return true;
1627 
1628 	skb = skb_peek(skbs);
1629 	fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1630 	info = IEEE80211_SKB_CB(skb);
1631 	sdata = vif_to_sdata(info->control.vif);
1632 	if (sta && !sta->uploaded)
1633 		sta = NULL;
1634 
1635 	if (sta)
1636 		pubsta = &sta->sta;
1637 	else
1638 		pubsta = NULL;
1639 
1640 	switch (sdata->vif.type) {
1641 	case NL80211_IFTYPE_MONITOR:
1642 		if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1643 			vif = &sdata->vif;
1644 			break;
1645 		}
1646 		sdata = rcu_dereference(local->monitor_sdata);
1647 		if (sdata) {
1648 			vif = &sdata->vif;
1649 			info->hw_queue =
1650 				vif->hw_queue[skb_get_queue_mapping(skb)];
1651 		} else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1652 			ieee80211_purge_tx_queue(&local->hw, skbs);
1653 			return true;
1654 		} else
1655 			vif = NULL;
1656 		break;
1657 	case NL80211_IFTYPE_AP_VLAN:
1658 		sdata = container_of(sdata->bss,
1659 				     struct ieee80211_sub_if_data, u.ap);
1660 		/* fall through */
1661 	default:
1662 		vif = &sdata->vif;
1663 		break;
1664 	}
1665 
1666 	result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1667 				    txpending);
1668 
1669 	ieee80211_tpt_led_trig_tx(local, fc, led_len);
1670 
1671 	WARN_ON_ONCE(!skb_queue_empty(skbs));
1672 
1673 	return result;
1674 }
1675 
1676 /*
1677  * Invoke TX handlers, return 0 on success and non-zero if the
1678  * frame was dropped or queued.
1679  *
1680  * The handlers are split into an early and late part. The latter is everything
1681  * that can be sensitive to reordering, and will be deferred to after packets
1682  * are dequeued from the intermediate queues (when they are enabled).
1683  */
1684 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1685 {
1686 	ieee80211_tx_result res = TX_DROP;
1687 
1688 #define CALL_TXH(txh) \
1689 	do {				\
1690 		res = txh(tx);		\
1691 		if (res != TX_CONTINUE)	\
1692 			goto txh_done;	\
1693 	} while (0)
1694 
1695 	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1696 	CALL_TXH(ieee80211_tx_h_check_assoc);
1697 	CALL_TXH(ieee80211_tx_h_ps_buf);
1698 	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1699 	CALL_TXH(ieee80211_tx_h_select_key);
1700 	if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1701 		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1702 
1703  txh_done:
1704 	if (unlikely(res == TX_DROP)) {
1705 		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1706 		if (tx->skb)
1707 			ieee80211_free_txskb(&tx->local->hw, tx->skb);
1708 		else
1709 			ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1710 		return -1;
1711 	} else if (unlikely(res == TX_QUEUED)) {
1712 		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1713 		return -1;
1714 	}
1715 
1716 	return 0;
1717 }
1718 
1719 /*
1720  * Late handlers can be called while the sta lock is held. Handlers that can
1721  * cause packets to be generated will cause deadlock!
1722  */
1723 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1724 {
1725 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1726 	ieee80211_tx_result res = TX_CONTINUE;
1727 
1728 	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1729 		__skb_queue_tail(&tx->skbs, tx->skb);
1730 		tx->skb = NULL;
1731 		goto txh_done;
1732 	}
1733 
1734 	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1735 	CALL_TXH(ieee80211_tx_h_sequence);
1736 	CALL_TXH(ieee80211_tx_h_fragment);
1737 	/* handlers after fragment must be aware of tx info fragmentation! */
1738 	CALL_TXH(ieee80211_tx_h_stats);
1739 	CALL_TXH(ieee80211_tx_h_encrypt);
1740 	if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1741 		CALL_TXH(ieee80211_tx_h_calculate_duration);
1742 #undef CALL_TXH
1743 
1744  txh_done:
1745 	if (unlikely(res == TX_DROP)) {
1746 		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1747 		if (tx->skb)
1748 			ieee80211_free_txskb(&tx->local->hw, tx->skb);
1749 		else
1750 			ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1751 		return -1;
1752 	} else if (unlikely(res == TX_QUEUED)) {
1753 		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1754 		return -1;
1755 	}
1756 
1757 	return 0;
1758 }
1759 
1760 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1761 {
1762 	int r = invoke_tx_handlers_early(tx);
1763 
1764 	if (r)
1765 		return r;
1766 	return invoke_tx_handlers_late(tx);
1767 }
1768 
1769 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1770 			      struct ieee80211_vif *vif, struct sk_buff *skb,
1771 			      int band, struct ieee80211_sta **sta)
1772 {
1773 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1774 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1775 	struct ieee80211_tx_data tx;
1776 	struct sk_buff *skb2;
1777 
1778 	if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1779 		return false;
1780 
1781 	info->band = band;
1782 	info->control.vif = vif;
1783 	info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1784 
1785 	if (invoke_tx_handlers(&tx))
1786 		return false;
1787 
1788 	if (sta) {
1789 		if (tx.sta)
1790 			*sta = &tx.sta->sta;
1791 		else
1792 			*sta = NULL;
1793 	}
1794 
1795 	/* this function isn't suitable for fragmented data frames */
1796 	skb2 = __skb_dequeue(&tx.skbs);
1797 	if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1798 		ieee80211_free_txskb(hw, skb2);
1799 		ieee80211_purge_tx_queue(hw, &tx.skbs);
1800 		return false;
1801 	}
1802 
1803 	return true;
1804 }
1805 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1806 
1807 /*
1808  * Returns false if the frame couldn't be transmitted but was queued instead.
1809  */
1810 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1811 			 struct sta_info *sta, struct sk_buff *skb,
1812 			 bool txpending)
1813 {
1814 	struct ieee80211_local *local = sdata->local;
1815 	struct ieee80211_tx_data tx;
1816 	ieee80211_tx_result res_prepare;
1817 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1818 	bool result = true;
1819 	int led_len;
1820 
1821 	if (unlikely(skb->len < 10)) {
1822 		dev_kfree_skb(skb);
1823 		return true;
1824 	}
1825 
1826 	/* initialises tx */
1827 	led_len = skb->len;
1828 	res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1829 
1830 	if (unlikely(res_prepare == TX_DROP)) {
1831 		ieee80211_free_txskb(&local->hw, skb);
1832 		return true;
1833 	} else if (unlikely(res_prepare == TX_QUEUED)) {
1834 		return true;
1835 	}
1836 
1837 	/* set up hw_queue value early */
1838 	if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1839 	    !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1840 		info->hw_queue =
1841 			sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1842 
1843 	if (invoke_tx_handlers_early(&tx))
1844 		return false;
1845 
1846 	if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1847 		return true;
1848 
1849 	if (!invoke_tx_handlers_late(&tx))
1850 		result = __ieee80211_tx(local, &tx.skbs, led_len,
1851 					tx.sta, txpending);
1852 
1853 	return result;
1854 }
1855 
1856 /* device xmit handlers */
1857 
1858 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1859 				struct sk_buff *skb,
1860 				int head_need, bool may_encrypt)
1861 {
1862 	struct ieee80211_local *local = sdata->local;
1863 	int tail_need = 0;
1864 
1865 	if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1866 		tail_need = IEEE80211_ENCRYPT_TAILROOM;
1867 		tail_need -= skb_tailroom(skb);
1868 		tail_need = max_t(int, tail_need, 0);
1869 	}
1870 
1871 	if (skb_cloned(skb) &&
1872 	    (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1873 	     !skb_clone_writable(skb, ETH_HLEN) ||
1874 	     (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1875 		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1876 	else if (head_need || tail_need)
1877 		I802_DEBUG_INC(local->tx_expand_skb_head);
1878 	else
1879 		return 0;
1880 
1881 	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1882 		wiphy_debug(local->hw.wiphy,
1883 			    "failed to reallocate TX buffer\n");
1884 		return -ENOMEM;
1885 	}
1886 
1887 	return 0;
1888 }
1889 
1890 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1891 		    struct sta_info *sta, struct sk_buff *skb)
1892 {
1893 	struct ieee80211_local *local = sdata->local;
1894 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1895 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1896 	int headroom;
1897 	bool may_encrypt;
1898 
1899 	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1900 
1901 	headroom = local->tx_headroom;
1902 	if (may_encrypt)
1903 		headroom += sdata->encrypt_headroom;
1904 	headroom -= skb_headroom(skb);
1905 	headroom = max_t(int, 0, headroom);
1906 
1907 	if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1908 		ieee80211_free_txskb(&local->hw, skb);
1909 		return;
1910 	}
1911 
1912 	hdr = (struct ieee80211_hdr *) skb->data;
1913 	info->control.vif = &sdata->vif;
1914 
1915 	if (ieee80211_vif_is_mesh(&sdata->vif)) {
1916 		if (ieee80211_is_data(hdr->frame_control) &&
1917 		    is_unicast_ether_addr(hdr->addr1)) {
1918 			if (mesh_nexthop_resolve(sdata, skb))
1919 				return; /* skb queued: don't free */
1920 		} else {
1921 			ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1922 		}
1923 	}
1924 
1925 	ieee80211_set_qos_hdr(sdata, skb);
1926 	ieee80211_tx(sdata, sta, skb, false);
1927 }
1928 
1929 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1930 					struct sk_buff *skb)
1931 {
1932 	struct ieee80211_radiotap_iterator iterator;
1933 	struct ieee80211_radiotap_header *rthdr =
1934 		(struct ieee80211_radiotap_header *) skb->data;
1935 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1936 	struct ieee80211_supported_band *sband =
1937 		local->hw.wiphy->bands[info->band];
1938 	int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1939 						   NULL);
1940 	u16 txflags;
1941 	u16 rate = 0;
1942 	bool rate_found = false;
1943 	u8 rate_retries = 0;
1944 	u16 rate_flags = 0;
1945 	u8 mcs_known, mcs_flags, mcs_bw;
1946 	u16 vht_known;
1947 	u8 vht_mcs = 0, vht_nss = 0;
1948 	int i;
1949 
1950 	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1951 		       IEEE80211_TX_CTL_DONTFRAG;
1952 
1953 	/*
1954 	 * for every radiotap entry that is present
1955 	 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1956 	 * entries present, or -EINVAL on error)
1957 	 */
1958 
1959 	while (!ret) {
1960 		ret = ieee80211_radiotap_iterator_next(&iterator);
1961 
1962 		if (ret)
1963 			continue;
1964 
1965 		/* see if this argument is something we can use */
1966 		switch (iterator.this_arg_index) {
1967 		/*
1968 		 * You must take care when dereferencing iterator.this_arg
1969 		 * for multibyte types... the pointer is not aligned.  Use
1970 		 * get_unaligned((type *)iterator.this_arg) to dereference
1971 		 * iterator.this_arg for type "type" safely on all arches.
1972 		*/
1973 		case IEEE80211_RADIOTAP_FLAGS:
1974 			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1975 				/*
1976 				 * this indicates that the skb we have been
1977 				 * handed has the 32-bit FCS CRC at the end...
1978 				 * we should react to that by snipping it off
1979 				 * because it will be recomputed and added
1980 				 * on transmission
1981 				 */
1982 				if (skb->len < (iterator._max_length + FCS_LEN))
1983 					return false;
1984 
1985 				skb_trim(skb, skb->len - FCS_LEN);
1986 			}
1987 			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1988 				info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1989 			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1990 				info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1991 			break;
1992 
1993 		case IEEE80211_RADIOTAP_TX_FLAGS:
1994 			txflags = get_unaligned_le16(iterator.this_arg);
1995 			if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1996 				info->flags |= IEEE80211_TX_CTL_NO_ACK;
1997 			break;
1998 
1999 		case IEEE80211_RADIOTAP_RATE:
2000 			rate = *iterator.this_arg;
2001 			rate_flags = 0;
2002 			rate_found = true;
2003 			break;
2004 
2005 		case IEEE80211_RADIOTAP_DATA_RETRIES:
2006 			rate_retries = *iterator.this_arg;
2007 			break;
2008 
2009 		case IEEE80211_RADIOTAP_MCS:
2010 			mcs_known = iterator.this_arg[0];
2011 			mcs_flags = iterator.this_arg[1];
2012 			if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2013 				break;
2014 
2015 			rate_found = true;
2016 			rate = iterator.this_arg[2];
2017 			rate_flags = IEEE80211_TX_RC_MCS;
2018 
2019 			if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2020 			    mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2021 				rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2022 
2023 			mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2024 			if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2025 			    mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2026 				rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2027 			break;
2028 
2029 		case IEEE80211_RADIOTAP_VHT:
2030 			vht_known = get_unaligned_le16(iterator.this_arg);
2031 			rate_found = true;
2032 
2033 			rate_flags = IEEE80211_TX_RC_VHT_MCS;
2034 			if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2035 			    (iterator.this_arg[2] &
2036 			     IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2037 				rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2038 			if (vht_known &
2039 			    IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2040 				if (iterator.this_arg[3] == 1)
2041 					rate_flags |=
2042 						IEEE80211_TX_RC_40_MHZ_WIDTH;
2043 				else if (iterator.this_arg[3] == 4)
2044 					rate_flags |=
2045 						IEEE80211_TX_RC_80_MHZ_WIDTH;
2046 				else if (iterator.this_arg[3] == 11)
2047 					rate_flags |=
2048 						IEEE80211_TX_RC_160_MHZ_WIDTH;
2049 			}
2050 
2051 			vht_mcs = iterator.this_arg[4] >> 4;
2052 			vht_nss = iterator.this_arg[4] & 0xF;
2053 			break;
2054 
2055 		/*
2056 		 * Please update the file
2057 		 * Documentation/networking/mac80211-injection.txt
2058 		 * when parsing new fields here.
2059 		 */
2060 
2061 		default:
2062 			break;
2063 		}
2064 	}
2065 
2066 	if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2067 		return false;
2068 
2069 	if (rate_found) {
2070 		info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2071 
2072 		for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2073 			info->control.rates[i].idx = -1;
2074 			info->control.rates[i].flags = 0;
2075 			info->control.rates[i].count = 0;
2076 		}
2077 
2078 		if (rate_flags & IEEE80211_TX_RC_MCS) {
2079 			info->control.rates[0].idx = rate;
2080 		} else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2081 			ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2082 					       vht_nss);
2083 		} else {
2084 			for (i = 0; i < sband->n_bitrates; i++) {
2085 				if (rate * 5 != sband->bitrates[i].bitrate)
2086 					continue;
2087 
2088 				info->control.rates[0].idx = i;
2089 				break;
2090 			}
2091 		}
2092 
2093 		if (info->control.rates[0].idx < 0)
2094 			info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2095 
2096 		info->control.rates[0].flags = rate_flags;
2097 		info->control.rates[0].count = min_t(u8, rate_retries + 1,
2098 						     local->hw.max_rate_tries);
2099 	}
2100 
2101 	/*
2102 	 * remove the radiotap header
2103 	 * iterator->_max_length was sanity-checked against
2104 	 * skb->len by iterator init
2105 	 */
2106 	skb_pull(skb, iterator._max_length);
2107 
2108 	return true;
2109 }
2110 
2111 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2112 					 struct net_device *dev)
2113 {
2114 	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2115 	struct ieee80211_chanctx_conf *chanctx_conf;
2116 	struct ieee80211_radiotap_header *prthdr =
2117 		(struct ieee80211_radiotap_header *)skb->data;
2118 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2119 	struct ieee80211_hdr *hdr;
2120 	struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2121 	struct cfg80211_chan_def *chandef;
2122 	u16 len_rthdr;
2123 	int hdrlen;
2124 
2125 	/* check for not even having the fixed radiotap header part */
2126 	if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2127 		goto fail; /* too short to be possibly valid */
2128 
2129 	/* is it a header version we can trust to find length from? */
2130 	if (unlikely(prthdr->it_version))
2131 		goto fail; /* only version 0 is supported */
2132 
2133 	/* then there must be a radiotap header with a length we can use */
2134 	len_rthdr = ieee80211_get_radiotap_len(skb->data);
2135 
2136 	/* does the skb contain enough to deliver on the alleged length? */
2137 	if (unlikely(skb->len < len_rthdr))
2138 		goto fail; /* skb too short for claimed rt header extent */
2139 
2140 	/*
2141 	 * fix up the pointers accounting for the radiotap
2142 	 * header still being in there.  We are being given
2143 	 * a precooked IEEE80211 header so no need for
2144 	 * normal processing
2145 	 */
2146 	skb_set_mac_header(skb, len_rthdr);
2147 	/*
2148 	 * these are just fixed to the end of the rt area since we
2149 	 * don't have any better information and at this point, nobody cares
2150 	 */
2151 	skb_set_network_header(skb, len_rthdr);
2152 	skb_set_transport_header(skb, len_rthdr);
2153 
2154 	if (skb->len < len_rthdr + 2)
2155 		goto fail;
2156 
2157 	hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2158 	hdrlen = ieee80211_hdrlen(hdr->frame_control);
2159 
2160 	if (skb->len < len_rthdr + hdrlen)
2161 		goto fail;
2162 
2163 	/*
2164 	 * Initialize skb->protocol if the injected frame is a data frame
2165 	 * carrying a rfc1042 header
2166 	 */
2167 	if (ieee80211_is_data(hdr->frame_control) &&
2168 	    skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2169 		u8 *payload = (u8 *)hdr + hdrlen;
2170 
2171 		if (ether_addr_equal(payload, rfc1042_header))
2172 			skb->protocol = cpu_to_be16((payload[6] << 8) |
2173 						    payload[7]);
2174 	}
2175 
2176 	memset(info, 0, sizeof(*info));
2177 
2178 	info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2179 		      IEEE80211_TX_CTL_INJECTED;
2180 
2181 	rcu_read_lock();
2182 
2183 	/*
2184 	 * We process outgoing injected frames that have a local address
2185 	 * we handle as though they are non-injected frames.
2186 	 * This code here isn't entirely correct, the local MAC address
2187 	 * isn't always enough to find the interface to use; for proper
2188 	 * VLAN/WDS support we will need a different mechanism (which
2189 	 * likely isn't going to be monitor interfaces).
2190 	 */
2191 	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2192 
2193 	list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2194 		if (!ieee80211_sdata_running(tmp_sdata))
2195 			continue;
2196 		if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2197 		    tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2198 		    tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2199 			continue;
2200 		if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2201 			sdata = tmp_sdata;
2202 			break;
2203 		}
2204 	}
2205 
2206 	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2207 	if (!chanctx_conf) {
2208 		tmp_sdata = rcu_dereference(local->monitor_sdata);
2209 		if (tmp_sdata)
2210 			chanctx_conf =
2211 				rcu_dereference(tmp_sdata->vif.chanctx_conf);
2212 	}
2213 
2214 	if (chanctx_conf)
2215 		chandef = &chanctx_conf->def;
2216 	else if (!local->use_chanctx)
2217 		chandef = &local->_oper_chandef;
2218 	else
2219 		goto fail_rcu;
2220 
2221 	/*
2222 	 * Frame injection is not allowed if beaconing is not allowed
2223 	 * or if we need radar detection. Beaconing is usually not allowed when
2224 	 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2225 	 * Passive scan is also used in world regulatory domains where
2226 	 * your country is not known and as such it should be treated as
2227 	 * NO TX unless the channel is explicitly allowed in which case
2228 	 * your current regulatory domain would not have the passive scan
2229 	 * flag.
2230 	 *
2231 	 * Since AP mode uses monitor interfaces to inject/TX management
2232 	 * frames we can make AP mode the exception to this rule once it
2233 	 * supports radar detection as its implementation can deal with
2234 	 * radar detection by itself. We can do that later by adding a
2235 	 * monitor flag interfaces used for AP support.
2236 	 */
2237 	if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2238 				     sdata->vif.type))
2239 		goto fail_rcu;
2240 
2241 	info->band = chandef->chan->band;
2242 
2243 	/* process and remove the injection radiotap header */
2244 	if (!ieee80211_parse_tx_radiotap(local, skb))
2245 		goto fail_rcu;
2246 
2247 	ieee80211_xmit(sdata, NULL, skb);
2248 	rcu_read_unlock();
2249 
2250 	return NETDEV_TX_OK;
2251 
2252 fail_rcu:
2253 	rcu_read_unlock();
2254 fail:
2255 	dev_kfree_skb(skb);
2256 	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2257 }
2258 
2259 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2260 {
2261 	u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2262 
2263 	return ethertype == ETH_P_TDLS &&
2264 	       skb->len > 14 &&
2265 	       skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2266 }
2267 
2268 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2269 				   struct sk_buff *skb,
2270 				   struct sta_info **sta_out)
2271 {
2272 	struct sta_info *sta;
2273 
2274 	switch (sdata->vif.type) {
2275 	case NL80211_IFTYPE_AP_VLAN:
2276 		sta = rcu_dereference(sdata->u.vlan.sta);
2277 		if (sta) {
2278 			*sta_out = sta;
2279 			return 0;
2280 		} else if (sdata->wdev.use_4addr) {
2281 			return -ENOLINK;
2282 		}
2283 		/* fall through */
2284 	case NL80211_IFTYPE_AP:
2285 	case NL80211_IFTYPE_OCB:
2286 	case NL80211_IFTYPE_ADHOC:
2287 		if (is_multicast_ether_addr(skb->data)) {
2288 			*sta_out = ERR_PTR(-ENOENT);
2289 			return 0;
2290 		}
2291 		sta = sta_info_get_bss(sdata, skb->data);
2292 		break;
2293 	case NL80211_IFTYPE_WDS:
2294 		sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2295 		break;
2296 #ifdef CONFIG_MAC80211_MESH
2297 	case NL80211_IFTYPE_MESH_POINT:
2298 		/* determined much later */
2299 		*sta_out = NULL;
2300 		return 0;
2301 #endif
2302 	case NL80211_IFTYPE_STATION:
2303 		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2304 			sta = sta_info_get(sdata, skb->data);
2305 			if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2306 				if (test_sta_flag(sta,
2307 						  WLAN_STA_TDLS_PEER_AUTH)) {
2308 					*sta_out = sta;
2309 					return 0;
2310 				}
2311 
2312 				/*
2313 				 * TDLS link during setup - throw out frames to
2314 				 * peer. Allow TDLS-setup frames to unauthorized
2315 				 * peers for the special case of a link teardown
2316 				 * after a TDLS sta is removed due to being
2317 				 * unreachable.
2318 				 */
2319 				if (!ieee80211_is_tdls_setup(skb))
2320 					return -EINVAL;
2321 			}
2322 
2323 		}
2324 
2325 		sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2326 		if (!sta)
2327 			return -ENOLINK;
2328 		break;
2329 	default:
2330 		return -EINVAL;
2331 	}
2332 
2333 	*sta_out = sta ?: ERR_PTR(-ENOENT);
2334 	return 0;
2335 }
2336 
2337 /**
2338  * ieee80211_build_hdr - build 802.11 header in the given frame
2339  * @sdata: virtual interface to build the header for
2340  * @skb: the skb to build the header in
2341  * @info_flags: skb flags to set
2342  *
2343  * This function takes the skb with 802.3 header and reformats the header to
2344  * the appropriate IEEE 802.11 header based on which interface the packet is
2345  * being transmitted on.
2346  *
2347  * Note that this function also takes care of the TX status request and
2348  * potential unsharing of the SKB - this needs to be interleaved with the
2349  * header building.
2350  *
2351  * The function requires the read-side RCU lock held
2352  *
2353  * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2354  */
2355 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2356 					   struct sk_buff *skb, u32 info_flags,
2357 					   struct sta_info *sta)
2358 {
2359 	struct ieee80211_local *local = sdata->local;
2360 	struct ieee80211_tx_info *info;
2361 	int head_need;
2362 	u16 ethertype, hdrlen,  meshhdrlen = 0;
2363 	__le16 fc;
2364 	struct ieee80211_hdr hdr;
2365 	struct ieee80211s_hdr mesh_hdr __maybe_unused;
2366 	struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2367 	const u8 *encaps_data;
2368 	int encaps_len, skip_header_bytes;
2369 	bool wme_sta = false, authorized = false;
2370 	bool tdls_peer;
2371 	bool multicast;
2372 	u16 info_id = 0;
2373 	struct ieee80211_chanctx_conf *chanctx_conf;
2374 	struct ieee80211_sub_if_data *ap_sdata;
2375 	enum nl80211_band band;
2376 	int ret;
2377 
2378 	if (IS_ERR(sta))
2379 		sta = NULL;
2380 
2381 	/* convert Ethernet header to proper 802.11 header (based on
2382 	 * operation mode) */
2383 	ethertype = (skb->data[12] << 8) | skb->data[13];
2384 	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2385 
2386 	switch (sdata->vif.type) {
2387 	case NL80211_IFTYPE_AP_VLAN:
2388 		if (sdata->wdev.use_4addr) {
2389 			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2390 			/* RA TA DA SA */
2391 			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2392 			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2393 			memcpy(hdr.addr3, skb->data, ETH_ALEN);
2394 			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2395 			hdrlen = 30;
2396 			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2397 			wme_sta = sta->sta.wme;
2398 		}
2399 		ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2400 					u.ap);
2401 		chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2402 		if (!chanctx_conf) {
2403 			ret = -ENOTCONN;
2404 			goto free;
2405 		}
2406 		band = chanctx_conf->def.chan->band;
2407 		if (sdata->wdev.use_4addr)
2408 			break;
2409 		/* fall through */
2410 	case NL80211_IFTYPE_AP:
2411 		if (sdata->vif.type == NL80211_IFTYPE_AP)
2412 			chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2413 		if (!chanctx_conf) {
2414 			ret = -ENOTCONN;
2415 			goto free;
2416 		}
2417 		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2418 		/* DA BSSID SA */
2419 		memcpy(hdr.addr1, skb->data, ETH_ALEN);
2420 		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2421 		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2422 		hdrlen = 24;
2423 		band = chanctx_conf->def.chan->band;
2424 		break;
2425 	case NL80211_IFTYPE_WDS:
2426 		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2427 		/* RA TA DA SA */
2428 		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2429 		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2430 		memcpy(hdr.addr3, skb->data, ETH_ALEN);
2431 		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2432 		hdrlen = 30;
2433 		/*
2434 		 * This is the exception! WDS style interfaces are prohibited
2435 		 * when channel contexts are in used so this must be valid
2436 		 */
2437 		band = local->hw.conf.chandef.chan->band;
2438 		break;
2439 #ifdef CONFIG_MAC80211_MESH
2440 	case NL80211_IFTYPE_MESH_POINT:
2441 		if (!is_multicast_ether_addr(skb->data)) {
2442 			struct sta_info *next_hop;
2443 			bool mpp_lookup = true;
2444 
2445 			mpath = mesh_path_lookup(sdata, skb->data);
2446 			if (mpath) {
2447 				mpp_lookup = false;
2448 				next_hop = rcu_dereference(mpath->next_hop);
2449 				if (!next_hop ||
2450 				    !(mpath->flags & (MESH_PATH_ACTIVE |
2451 						      MESH_PATH_RESOLVING)))
2452 					mpp_lookup = true;
2453 			}
2454 
2455 			if (mpp_lookup) {
2456 				mppath = mpp_path_lookup(sdata, skb->data);
2457 				if (mppath)
2458 					mppath->exp_time = jiffies;
2459 			}
2460 
2461 			if (mppath && mpath)
2462 				mesh_path_del(sdata, mpath->dst);
2463 		}
2464 
2465 		/*
2466 		 * Use address extension if it is a packet from
2467 		 * another interface or if we know the destination
2468 		 * is being proxied by a portal (i.e. portal address
2469 		 * differs from proxied address)
2470 		 */
2471 		if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2472 		    !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2473 			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2474 					skb->data, skb->data + ETH_ALEN);
2475 			meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2476 							       NULL, NULL);
2477 		} else {
2478 			/* DS -> MBSS (802.11-2012 13.11.3.3).
2479 			 * For unicast with unknown forwarding information,
2480 			 * destination might be in the MBSS or if that fails
2481 			 * forwarded to another mesh gate. In either case
2482 			 * resolution will be handled in ieee80211_xmit(), so
2483 			 * leave the original DA. This also works for mcast */
2484 			const u8 *mesh_da = skb->data;
2485 
2486 			if (mppath)
2487 				mesh_da = mppath->mpp;
2488 			else if (mpath)
2489 				mesh_da = mpath->dst;
2490 
2491 			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2492 					mesh_da, sdata->vif.addr);
2493 			if (is_multicast_ether_addr(mesh_da))
2494 				/* DA TA mSA AE:SA */
2495 				meshhdrlen = ieee80211_new_mesh_header(
2496 						sdata, &mesh_hdr,
2497 						skb->data + ETH_ALEN, NULL);
2498 			else
2499 				/* RA TA mDA mSA AE:DA SA */
2500 				meshhdrlen = ieee80211_new_mesh_header(
2501 						sdata, &mesh_hdr, skb->data,
2502 						skb->data + ETH_ALEN);
2503 
2504 		}
2505 		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2506 		if (!chanctx_conf) {
2507 			ret = -ENOTCONN;
2508 			goto free;
2509 		}
2510 		band = chanctx_conf->def.chan->band;
2511 		break;
2512 #endif
2513 	case NL80211_IFTYPE_STATION:
2514 		/* we already did checks when looking up the RA STA */
2515 		tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2516 
2517 		if (tdls_peer) {
2518 			/* DA SA BSSID */
2519 			memcpy(hdr.addr1, skb->data, ETH_ALEN);
2520 			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2521 			memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2522 			hdrlen = 24;
2523 		}  else if (sdata->u.mgd.use_4addr &&
2524 			    cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2525 			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2526 					  IEEE80211_FCTL_TODS);
2527 			/* RA TA DA SA */
2528 			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2529 			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2530 			memcpy(hdr.addr3, skb->data, ETH_ALEN);
2531 			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2532 			hdrlen = 30;
2533 		} else {
2534 			fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2535 			/* BSSID SA DA */
2536 			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2537 			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2538 			memcpy(hdr.addr3, skb->data, ETH_ALEN);
2539 			hdrlen = 24;
2540 		}
2541 		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2542 		if (!chanctx_conf) {
2543 			ret = -ENOTCONN;
2544 			goto free;
2545 		}
2546 		band = chanctx_conf->def.chan->band;
2547 		break;
2548 	case NL80211_IFTYPE_OCB:
2549 		/* DA SA BSSID */
2550 		memcpy(hdr.addr1, skb->data, ETH_ALEN);
2551 		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2552 		eth_broadcast_addr(hdr.addr3);
2553 		hdrlen = 24;
2554 		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2555 		if (!chanctx_conf) {
2556 			ret = -ENOTCONN;
2557 			goto free;
2558 		}
2559 		band = chanctx_conf->def.chan->band;
2560 		break;
2561 	case NL80211_IFTYPE_ADHOC:
2562 		/* DA SA BSSID */
2563 		memcpy(hdr.addr1, skb->data, ETH_ALEN);
2564 		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2565 		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2566 		hdrlen = 24;
2567 		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2568 		if (!chanctx_conf) {
2569 			ret = -ENOTCONN;
2570 			goto free;
2571 		}
2572 		band = chanctx_conf->def.chan->band;
2573 		break;
2574 	default:
2575 		ret = -EINVAL;
2576 		goto free;
2577 	}
2578 
2579 	multicast = is_multicast_ether_addr(hdr.addr1);
2580 
2581 	/* sta is always NULL for mesh */
2582 	if (sta) {
2583 		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2584 		wme_sta = sta->sta.wme;
2585 	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2586 		/* For mesh, the use of the QoS header is mandatory */
2587 		wme_sta = true;
2588 	}
2589 
2590 	/* receiver does QoS (which also means we do) use it */
2591 	if (wme_sta) {
2592 		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2593 		hdrlen += 2;
2594 	}
2595 
2596 	/*
2597 	 * Drop unicast frames to unauthorised stations unless they are
2598 	 * EAPOL frames from the local station.
2599 	 */
2600 	if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2601 		     (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2602 		     !multicast && !authorized &&
2603 		     (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2604 		      !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2605 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2606 		net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2607 				    sdata->name, hdr.addr1);
2608 #endif
2609 
2610 		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2611 
2612 		ret = -EPERM;
2613 		goto free;
2614 	}
2615 
2616 	if (unlikely(!multicast && skb->sk &&
2617 		     skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2618 		struct sk_buff *ack_skb = skb_clone_sk(skb);
2619 
2620 		if (ack_skb) {
2621 			unsigned long flags;
2622 			int id;
2623 
2624 			spin_lock_irqsave(&local->ack_status_lock, flags);
2625 			id = idr_alloc(&local->ack_status_frames, ack_skb,
2626 				       1, 0x10000, GFP_ATOMIC);
2627 			spin_unlock_irqrestore(&local->ack_status_lock, flags);
2628 
2629 			if (id >= 0) {
2630 				info_id = id;
2631 				info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2632 			} else {
2633 				kfree_skb(ack_skb);
2634 			}
2635 		}
2636 	}
2637 
2638 	/*
2639 	 * If the skb is shared we need to obtain our own copy.
2640 	 */
2641 	if (skb_shared(skb)) {
2642 		struct sk_buff *tmp_skb = skb;
2643 
2644 		/* can't happen -- skb is a clone if info_id != 0 */
2645 		WARN_ON(info_id);
2646 
2647 		skb = skb_clone(skb, GFP_ATOMIC);
2648 		kfree_skb(tmp_skb);
2649 
2650 		if (!skb) {
2651 			ret = -ENOMEM;
2652 			goto free;
2653 		}
2654 	}
2655 
2656 	hdr.frame_control = fc;
2657 	hdr.duration_id = 0;
2658 	hdr.seq_ctrl = 0;
2659 
2660 	skip_header_bytes = ETH_HLEN;
2661 	if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2662 		encaps_data = bridge_tunnel_header;
2663 		encaps_len = sizeof(bridge_tunnel_header);
2664 		skip_header_bytes -= 2;
2665 	} else if (ethertype >= ETH_P_802_3_MIN) {
2666 		encaps_data = rfc1042_header;
2667 		encaps_len = sizeof(rfc1042_header);
2668 		skip_header_bytes -= 2;
2669 	} else {
2670 		encaps_data = NULL;
2671 		encaps_len = 0;
2672 	}
2673 
2674 	skb_pull(skb, skip_header_bytes);
2675 	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2676 
2677 	/*
2678 	 * So we need to modify the skb header and hence need a copy of
2679 	 * that. The head_need variable above doesn't, so far, include
2680 	 * the needed header space that we don't need right away. If we
2681 	 * can, then we don't reallocate right now but only after the
2682 	 * frame arrives at the master device (if it does...)
2683 	 *
2684 	 * If we cannot, however, then we will reallocate to include all
2685 	 * the ever needed space. Also, if we need to reallocate it anyway,
2686 	 * make it big enough for everything we may ever need.
2687 	 */
2688 
2689 	if (head_need > 0 || skb_cloned(skb)) {
2690 		head_need += sdata->encrypt_headroom;
2691 		head_need += local->tx_headroom;
2692 		head_need = max_t(int, 0, head_need);
2693 		if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2694 			ieee80211_free_txskb(&local->hw, skb);
2695 			skb = NULL;
2696 			return ERR_PTR(-ENOMEM);
2697 		}
2698 	}
2699 
2700 	if (encaps_data)
2701 		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2702 
2703 #ifdef CONFIG_MAC80211_MESH
2704 	if (meshhdrlen > 0)
2705 		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2706 #endif
2707 
2708 	if (ieee80211_is_data_qos(fc)) {
2709 		__le16 *qos_control;
2710 
2711 		qos_control = skb_push(skb, 2);
2712 		memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2713 		/*
2714 		 * Maybe we could actually set some fields here, for now just
2715 		 * initialise to zero to indicate no special operation.
2716 		 */
2717 		*qos_control = 0;
2718 	} else
2719 		memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2720 
2721 	skb_reset_mac_header(skb);
2722 
2723 	info = IEEE80211_SKB_CB(skb);
2724 	memset(info, 0, sizeof(*info));
2725 
2726 	info->flags = info_flags;
2727 	info->ack_frame_id = info_id;
2728 	info->band = band;
2729 
2730 	return skb;
2731  free:
2732 	kfree_skb(skb);
2733 	return ERR_PTR(ret);
2734 }
2735 
2736 /*
2737  * fast-xmit overview
2738  *
2739  * The core idea of this fast-xmit is to remove per-packet checks by checking
2740  * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2741  * checks that are needed to get the sta->fast_tx pointer assigned, after which
2742  * much less work can be done per packet. For example, fragmentation must be
2743  * disabled or the fast_tx pointer will not be set. All the conditions are seen
2744  * in the code here.
2745  *
2746  * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2747  * header and other data to aid packet processing in ieee80211_xmit_fast().
2748  *
2749  * The most difficult part of this is that when any of these assumptions
2750  * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2751  * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2752  * since the per-packet code no longer checks the conditions. This is reflected
2753  * by the calls to these functions throughout the rest of the code, and must be
2754  * maintained if any of the TX path checks change.
2755  */
2756 
2757 void ieee80211_check_fast_xmit(struct sta_info *sta)
2758 {
2759 	struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2760 	struct ieee80211_local *local = sta->local;
2761 	struct ieee80211_sub_if_data *sdata = sta->sdata;
2762 	struct ieee80211_hdr *hdr = (void *)build.hdr;
2763 	struct ieee80211_chanctx_conf *chanctx_conf;
2764 	__le16 fc;
2765 
2766 	if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2767 		return;
2768 
2769 	/* Locking here protects both the pointer itself, and against concurrent
2770 	 * invocations winning data access races to, e.g., the key pointer that
2771 	 * is used.
2772 	 * Without it, the invocation of this function right after the key
2773 	 * pointer changes wouldn't be sufficient, as another CPU could access
2774 	 * the pointer, then stall, and then do the cache update after the CPU
2775 	 * that invalidated the key.
2776 	 * With the locking, such scenarios cannot happen as the check for the
2777 	 * key and the fast-tx assignment are done atomically, so the CPU that
2778 	 * modifies the key will either wait or other one will see the key
2779 	 * cleared/changed already.
2780 	 */
2781 	spin_lock_bh(&sta->lock);
2782 	if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2783 	    !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2784 	    sdata->vif.type == NL80211_IFTYPE_STATION)
2785 		goto out;
2786 
2787 	if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2788 		goto out;
2789 
2790 	if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2791 	    test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2792 	    test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2793 	    test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2794 		goto out;
2795 
2796 	if (sdata->noack_map)
2797 		goto out;
2798 
2799 	/* fast-xmit doesn't handle fragmentation at all */
2800 	if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2801 	    !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
2802 		goto out;
2803 
2804 	rcu_read_lock();
2805 	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2806 	if (!chanctx_conf) {
2807 		rcu_read_unlock();
2808 		goto out;
2809 	}
2810 	build.band = chanctx_conf->def.chan->band;
2811 	rcu_read_unlock();
2812 
2813 	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2814 
2815 	switch (sdata->vif.type) {
2816 	case NL80211_IFTYPE_ADHOC:
2817 		/* DA SA BSSID */
2818 		build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2819 		build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2820 		memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2821 		build.hdr_len = 24;
2822 		break;
2823 	case NL80211_IFTYPE_STATION:
2824 		if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2825 			/* DA SA BSSID */
2826 			build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2827 			build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2828 			memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2829 			build.hdr_len = 24;
2830 			break;
2831 		}
2832 
2833 		if (sdata->u.mgd.use_4addr) {
2834 			/* non-regular ethertype cannot use the fastpath */
2835 			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2836 					  IEEE80211_FCTL_TODS);
2837 			/* RA TA DA SA */
2838 			memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2839 			memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2840 			build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2841 			build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2842 			build.hdr_len = 30;
2843 			break;
2844 		}
2845 		fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2846 		/* BSSID SA DA */
2847 		memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2848 		build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2849 		build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2850 		build.hdr_len = 24;
2851 		break;
2852 	case NL80211_IFTYPE_AP_VLAN:
2853 		if (sdata->wdev.use_4addr) {
2854 			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2855 					  IEEE80211_FCTL_TODS);
2856 			/* RA TA DA SA */
2857 			memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2858 			memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2859 			build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2860 			build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2861 			build.hdr_len = 30;
2862 			break;
2863 		}
2864 		/* fall through */
2865 	case NL80211_IFTYPE_AP:
2866 		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2867 		/* DA BSSID SA */
2868 		build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2869 		memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2870 		build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2871 		build.hdr_len = 24;
2872 		break;
2873 	default:
2874 		/* not handled on fast-xmit */
2875 		goto out;
2876 	}
2877 
2878 	if (sta->sta.wme) {
2879 		build.hdr_len += 2;
2880 		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2881 	}
2882 
2883 	/* We store the key here so there's no point in using rcu_dereference()
2884 	 * but that's fine because the code that changes the pointers will call
2885 	 * this function after doing so. For a single CPU that would be enough,
2886 	 * for multiple see the comment above.
2887 	 */
2888 	build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2889 	if (!build.key)
2890 		build.key = rcu_access_pointer(sdata->default_unicast_key);
2891 	if (build.key) {
2892 		bool gen_iv, iv_spc, mmic;
2893 
2894 		gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2895 		iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2896 		mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
2897 
2898 		/* don't handle software crypto */
2899 		if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2900 			goto out;
2901 
2902 		switch (build.key->conf.cipher) {
2903 		case WLAN_CIPHER_SUITE_CCMP:
2904 		case WLAN_CIPHER_SUITE_CCMP_256:
2905 			/* add fixed key ID */
2906 			if (gen_iv) {
2907 				(build.hdr + build.hdr_len)[3] =
2908 					0x20 | (build.key->conf.keyidx << 6);
2909 				build.pn_offs = build.hdr_len;
2910 			}
2911 			if (gen_iv || iv_spc)
2912 				build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2913 			break;
2914 		case WLAN_CIPHER_SUITE_GCMP:
2915 		case WLAN_CIPHER_SUITE_GCMP_256:
2916 			/* add fixed key ID */
2917 			if (gen_iv) {
2918 				(build.hdr + build.hdr_len)[3] =
2919 					0x20 | (build.key->conf.keyidx << 6);
2920 				build.pn_offs = build.hdr_len;
2921 			}
2922 			if (gen_iv || iv_spc)
2923 				build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2924 			break;
2925 		case WLAN_CIPHER_SUITE_TKIP:
2926 			/* cannot handle MMIC or IV generation in xmit-fast */
2927 			if (mmic || gen_iv)
2928 				goto out;
2929 			if (iv_spc)
2930 				build.hdr_len += IEEE80211_TKIP_IV_LEN;
2931 			break;
2932 		case WLAN_CIPHER_SUITE_WEP40:
2933 		case WLAN_CIPHER_SUITE_WEP104:
2934 			/* cannot handle IV generation in fast-xmit */
2935 			if (gen_iv)
2936 				goto out;
2937 			if (iv_spc)
2938 				build.hdr_len += IEEE80211_WEP_IV_LEN;
2939 			break;
2940 		case WLAN_CIPHER_SUITE_AES_CMAC:
2941 		case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2942 		case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2943 		case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2944 			WARN(1,
2945 			     "management cipher suite 0x%x enabled for data\n",
2946 			     build.key->conf.cipher);
2947 			goto out;
2948 		default:
2949 			/* we don't know how to generate IVs for this at all */
2950 			if (WARN_ON(gen_iv))
2951 				goto out;
2952 			/* pure hardware keys are OK, of course */
2953 			if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2954 				break;
2955 			/* cipher scheme might require space allocation */
2956 			if (iv_spc &&
2957 			    build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2958 				goto out;
2959 			if (iv_spc)
2960 				build.hdr_len += build.key->conf.iv_len;
2961 		}
2962 
2963 		fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2964 	}
2965 
2966 	hdr->frame_control = fc;
2967 
2968 	memcpy(build.hdr + build.hdr_len,
2969 	       rfc1042_header,  sizeof(rfc1042_header));
2970 	build.hdr_len += sizeof(rfc1042_header);
2971 
2972 	fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2973 	/* if the kmemdup fails, continue w/o fast_tx */
2974 	if (!fast_tx)
2975 		goto out;
2976 
2977  out:
2978 	/* we might have raced against another call to this function */
2979 	old = rcu_dereference_protected(sta->fast_tx,
2980 					lockdep_is_held(&sta->lock));
2981 	rcu_assign_pointer(sta->fast_tx, fast_tx);
2982 	if (old)
2983 		kfree_rcu(old, rcu_head);
2984 	spin_unlock_bh(&sta->lock);
2985 }
2986 
2987 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2988 {
2989 	struct sta_info *sta;
2990 
2991 	rcu_read_lock();
2992 	list_for_each_entry_rcu(sta, &local->sta_list, list)
2993 		ieee80211_check_fast_xmit(sta);
2994 	rcu_read_unlock();
2995 }
2996 
2997 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
2998 {
2999 	struct ieee80211_local *local = sdata->local;
3000 	struct sta_info *sta;
3001 
3002 	rcu_read_lock();
3003 
3004 	list_for_each_entry_rcu(sta, &local->sta_list, list) {
3005 		if (sdata != sta->sdata &&
3006 		    (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3007 			continue;
3008 		ieee80211_check_fast_xmit(sta);
3009 	}
3010 
3011 	rcu_read_unlock();
3012 }
3013 
3014 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3015 {
3016 	struct ieee80211_fast_tx *fast_tx;
3017 
3018 	spin_lock_bh(&sta->lock);
3019 	fast_tx = rcu_dereference_protected(sta->fast_tx,
3020 					    lockdep_is_held(&sta->lock));
3021 	RCU_INIT_POINTER(sta->fast_tx, NULL);
3022 	spin_unlock_bh(&sta->lock);
3023 
3024 	if (fast_tx)
3025 		kfree_rcu(fast_tx, rcu_head);
3026 }
3027 
3028 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3029 					struct sk_buff *skb, int headroom,
3030 					int *subframe_len)
3031 {
3032 	int amsdu_len = *subframe_len + sizeof(struct ethhdr);
3033 	int padding = (4 - amsdu_len) & 3;
3034 
3035 	if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) {
3036 		I802_DEBUG_INC(local->tx_expand_skb_head);
3037 
3038 		if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) {
3039 			wiphy_debug(local->hw.wiphy,
3040 				    "failed to reallocate TX buffer\n");
3041 			return false;
3042 		}
3043 	}
3044 
3045 	if (padding) {
3046 		*subframe_len += padding;
3047 		skb_put_zero(skb, padding);
3048 	}
3049 
3050 	return true;
3051 }
3052 
3053 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3054 					 struct ieee80211_fast_tx *fast_tx,
3055 					 struct sk_buff *skb)
3056 {
3057 	struct ieee80211_local *local = sdata->local;
3058 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3059 	struct ieee80211_hdr *hdr;
3060 	struct ethhdr *amsdu_hdr;
3061 	int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3062 	int subframe_len = skb->len - hdr_len;
3063 	void *data;
3064 	u8 *qc, *h_80211_src, *h_80211_dst;
3065 	const u8 *bssid;
3066 
3067 	if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3068 		return false;
3069 
3070 	if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3071 		return true;
3072 
3073 	if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr),
3074 					 &subframe_len))
3075 		return false;
3076 
3077 	data = skb_push(skb, sizeof(*amsdu_hdr));
3078 	memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3079 	hdr = data;
3080 	amsdu_hdr = data + hdr_len;
3081 	/* h_80211_src/dst is addr* field within hdr */
3082 	h_80211_src = data + fast_tx->sa_offs;
3083 	h_80211_dst = data + fast_tx->da_offs;
3084 
3085 	amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3086 	ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3087 	ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3088 
3089 	/* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3090 	 * fields needs to be changed to BSSID for A-MSDU frames depending
3091 	 * on FromDS/ToDS values.
3092 	 */
3093 	switch (sdata->vif.type) {
3094 	case NL80211_IFTYPE_STATION:
3095 		bssid = sdata->u.mgd.bssid;
3096 		break;
3097 	case NL80211_IFTYPE_AP:
3098 	case NL80211_IFTYPE_AP_VLAN:
3099 		bssid = sdata->vif.addr;
3100 		break;
3101 	default:
3102 		bssid = NULL;
3103 	}
3104 
3105 	if (bssid && ieee80211_has_fromds(hdr->frame_control))
3106 		ether_addr_copy(h_80211_src, bssid);
3107 
3108 	if (bssid && ieee80211_has_tods(hdr->frame_control))
3109 		ether_addr_copy(h_80211_dst, bssid);
3110 
3111 	qc = ieee80211_get_qos_ctl(hdr);
3112 	*qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3113 
3114 	info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3115 
3116 	return true;
3117 }
3118 
3119 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3120 				      struct sta_info *sta,
3121 				      struct ieee80211_fast_tx *fast_tx,
3122 				      struct sk_buff *skb)
3123 {
3124 	struct ieee80211_local *local = sdata->local;
3125 	struct fq *fq = &local->fq;
3126 	struct fq_tin *tin;
3127 	struct fq_flow *flow;
3128 	u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3129 	struct ieee80211_txq *txq = sta->sta.txq[tid];
3130 	struct txq_info *txqi;
3131 	struct sk_buff **frag_tail, *head;
3132 	int subframe_len = skb->len - ETH_ALEN;
3133 	u8 max_subframes = sta->sta.max_amsdu_subframes;
3134 	int max_frags = local->hw.max_tx_fragments;
3135 	int max_amsdu_len = sta->sta.max_amsdu_len;
3136 	__be16 len;
3137 	void *data;
3138 	bool ret = false;
3139 	unsigned int orig_len;
3140 	int n = 1, nfrags;
3141 
3142 	if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3143 		return false;
3144 
3145 	if (!txq)
3146 		return false;
3147 
3148 	txqi = to_txq_info(txq);
3149 	if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3150 		return false;
3151 
3152 	if (sta->sta.max_rc_amsdu_len)
3153 		max_amsdu_len = min_t(int, max_amsdu_len,
3154 				      sta->sta.max_rc_amsdu_len);
3155 
3156 	spin_lock_bh(&fq->lock);
3157 
3158 	/* TODO: Ideally aggregation should be done on dequeue to remain
3159 	 * responsive to environment changes.
3160 	 */
3161 
3162 	tin = &txqi->tin;
3163 	flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3164 	head = skb_peek_tail(&flow->queue);
3165 	if (!head)
3166 		goto out;
3167 
3168 	orig_len = head->len;
3169 
3170 	if (skb->len + head->len > max_amsdu_len)
3171 		goto out;
3172 
3173 	if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3174 		goto out;
3175 
3176 	nfrags = 1 + skb_shinfo(skb)->nr_frags;
3177 	nfrags += 1 + skb_shinfo(head)->nr_frags;
3178 	frag_tail = &skb_shinfo(head)->frag_list;
3179 	while (*frag_tail) {
3180 		nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3181 		frag_tail = &(*frag_tail)->next;
3182 		n++;
3183 	}
3184 
3185 	if (max_subframes && n > max_subframes)
3186 		goto out;
3187 
3188 	if (max_frags && nfrags > max_frags)
3189 		goto out;
3190 
3191 	if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2,
3192 					 &subframe_len))
3193 		goto out;
3194 
3195 	ret = true;
3196 	data = skb_push(skb, ETH_ALEN + 2);
3197 	memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3198 
3199 	data += 2 * ETH_ALEN;
3200 	len = cpu_to_be16(subframe_len);
3201 	memcpy(data, &len, 2);
3202 	memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3203 
3204 	head->len += skb->len;
3205 	head->data_len += skb->len;
3206 	*frag_tail = skb;
3207 
3208 	flow->backlog += head->len - orig_len;
3209 	tin->backlog_bytes += head->len - orig_len;
3210 
3211 	fq_recalc_backlog(fq, tin, flow);
3212 
3213 out:
3214 	spin_unlock_bh(&fq->lock);
3215 
3216 	return ret;
3217 }
3218 
3219 /*
3220  * Can be called while the sta lock is held. Anything that can cause packets to
3221  * be generated will cause deadlock!
3222  */
3223 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3224 				       struct sta_info *sta, u8 pn_offs,
3225 				       struct ieee80211_key *key,
3226 				       struct sk_buff *skb)
3227 {
3228 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3229 	struct ieee80211_hdr *hdr = (void *)skb->data;
3230 	u8 tid = IEEE80211_NUM_TIDS;
3231 
3232 	if (key)
3233 		info->control.hw_key = &key->conf;
3234 
3235 	ieee80211_tx_stats(skb->dev, skb->len);
3236 
3237 	if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3238 		tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3239 		hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3240 	} else {
3241 		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3242 		hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3243 		sdata->sequence_number += 0x10;
3244 	}
3245 
3246 	if (skb_shinfo(skb)->gso_size)
3247 		sta->tx_stats.msdu[tid] +=
3248 			DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3249 	else
3250 		sta->tx_stats.msdu[tid]++;
3251 
3252 	info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3253 
3254 	/* statistics normally done by ieee80211_tx_h_stats (but that
3255 	 * has to consider fragmentation, so is more complex)
3256 	 */
3257 	sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3258 	sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3259 
3260 	if (pn_offs) {
3261 		u64 pn;
3262 		u8 *crypto_hdr = skb->data + pn_offs;
3263 
3264 		switch (key->conf.cipher) {
3265 		case WLAN_CIPHER_SUITE_CCMP:
3266 		case WLAN_CIPHER_SUITE_CCMP_256:
3267 		case WLAN_CIPHER_SUITE_GCMP:
3268 		case WLAN_CIPHER_SUITE_GCMP_256:
3269 			pn = atomic64_inc_return(&key->conf.tx_pn);
3270 			crypto_hdr[0] = pn;
3271 			crypto_hdr[1] = pn >> 8;
3272 			crypto_hdr[4] = pn >> 16;
3273 			crypto_hdr[5] = pn >> 24;
3274 			crypto_hdr[6] = pn >> 32;
3275 			crypto_hdr[7] = pn >> 40;
3276 			break;
3277 		}
3278 	}
3279 }
3280 
3281 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3282 				struct sta_info *sta,
3283 				struct ieee80211_fast_tx *fast_tx,
3284 				struct sk_buff *skb)
3285 {
3286 	struct ieee80211_local *local = sdata->local;
3287 	u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3288 	int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3289 	int hw_headroom = sdata->local->hw.extra_tx_headroom;
3290 	struct ethhdr eth;
3291 	struct ieee80211_tx_info *info;
3292 	struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3293 	struct ieee80211_tx_data tx;
3294 	ieee80211_tx_result r;
3295 	struct tid_ampdu_tx *tid_tx = NULL;
3296 	u8 tid = IEEE80211_NUM_TIDS;
3297 
3298 	/* control port protocol needs a lot of special handling */
3299 	if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3300 		return false;
3301 
3302 	/* only RFC 1042 SNAP */
3303 	if (ethertype < ETH_P_802_3_MIN)
3304 		return false;
3305 
3306 	/* don't handle TX status request here either */
3307 	if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3308 		return false;
3309 
3310 	if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3311 		tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3312 		tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3313 		if (tid_tx) {
3314 			if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3315 				return false;
3316 			if (tid_tx->timeout)
3317 				tid_tx->last_tx = jiffies;
3318 		}
3319 	}
3320 
3321 	/* after this point (skb is modified) we cannot return false */
3322 
3323 	if (skb_shared(skb)) {
3324 		struct sk_buff *tmp_skb = skb;
3325 
3326 		skb = skb_clone(skb, GFP_ATOMIC);
3327 		kfree_skb(tmp_skb);
3328 
3329 		if (!skb)
3330 			return true;
3331 	}
3332 
3333 	if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3334 	    ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3335 		return true;
3336 
3337 	/* will not be crypto-handled beyond what we do here, so use false
3338 	 * as the may-encrypt argument for the resize to not account for
3339 	 * more room than we already have in 'extra_head'
3340 	 */
3341 	if (unlikely(ieee80211_skb_resize(sdata, skb,
3342 					  max_t(int, extra_head + hw_headroom -
3343 						     skb_headroom(skb), 0),
3344 					  false))) {
3345 		kfree_skb(skb);
3346 		return true;
3347 	}
3348 
3349 	memcpy(&eth, skb->data, ETH_HLEN - 2);
3350 	hdr = skb_push(skb, extra_head);
3351 	memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3352 	memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3353 	memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3354 
3355 	info = IEEE80211_SKB_CB(skb);
3356 	memset(info, 0, sizeof(*info));
3357 	info->band = fast_tx->band;
3358 	info->control.vif = &sdata->vif;
3359 	info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3360 		      IEEE80211_TX_CTL_DONTFRAG |
3361 		      (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3362 	info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3363 
3364 	if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3365 		tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3366 		*ieee80211_get_qos_ctl(hdr) = tid;
3367 	}
3368 
3369 	__skb_queue_head_init(&tx.skbs);
3370 
3371 	tx.flags = IEEE80211_TX_UNICAST;
3372 	tx.local = local;
3373 	tx.sdata = sdata;
3374 	tx.sta = sta;
3375 	tx.key = fast_tx->key;
3376 
3377 	if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3378 		tx.skb = skb;
3379 		r = ieee80211_tx_h_rate_ctrl(&tx);
3380 		skb = tx.skb;
3381 		tx.skb = NULL;
3382 
3383 		if (r != TX_CONTINUE) {
3384 			if (r != TX_QUEUED)
3385 				kfree_skb(skb);
3386 			return true;
3387 		}
3388 	}
3389 
3390 	if (ieee80211_queue_skb(local, sdata, sta, skb))
3391 		return true;
3392 
3393 	ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3394 				   fast_tx->key, skb);
3395 
3396 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3397 		sdata = container_of(sdata->bss,
3398 				     struct ieee80211_sub_if_data, u.ap);
3399 
3400 	__skb_queue_tail(&tx.skbs, skb);
3401 	ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3402 	return true;
3403 }
3404 
3405 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3406 				     struct ieee80211_txq *txq)
3407 {
3408 	struct ieee80211_local *local = hw_to_local(hw);
3409 	struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3410 	struct ieee80211_hdr *hdr;
3411 	struct sk_buff *skb = NULL;
3412 	struct fq *fq = &local->fq;
3413 	struct fq_tin *tin = &txqi->tin;
3414 	struct ieee80211_tx_info *info;
3415 	struct ieee80211_tx_data tx;
3416 	ieee80211_tx_result r;
3417 
3418 	spin_lock_bh(&fq->lock);
3419 
3420 	if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
3421 		goto out;
3422 
3423 	/* Make sure fragments stay together. */
3424 	skb = __skb_dequeue(&txqi->frags);
3425 	if (skb)
3426 		goto out;
3427 
3428 begin:
3429 	skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3430 	if (!skb)
3431 		goto out;
3432 
3433 	ieee80211_set_skb_vif(skb, txqi);
3434 
3435 	hdr = (struct ieee80211_hdr *)skb->data;
3436 	info = IEEE80211_SKB_CB(skb);
3437 
3438 	memset(&tx, 0, sizeof(tx));
3439 	__skb_queue_head_init(&tx.skbs);
3440 	tx.local = local;
3441 	tx.skb = skb;
3442 	tx.sdata = vif_to_sdata(info->control.vif);
3443 
3444 	if (txq->sta)
3445 		tx.sta = container_of(txq->sta, struct sta_info, sta);
3446 
3447 	/*
3448 	 * The key can be removed while the packet was queued, so need to call
3449 	 * this here to get the current key.
3450 	 */
3451 	r = ieee80211_tx_h_select_key(&tx);
3452 	if (r != TX_CONTINUE) {
3453 		ieee80211_free_txskb(&local->hw, skb);
3454 		goto begin;
3455 	}
3456 
3457 	if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3458 		info->flags |= IEEE80211_TX_CTL_AMPDU;
3459 	else
3460 		info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3461 
3462 	if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3463 		struct sta_info *sta = container_of(txq->sta, struct sta_info,
3464 						    sta);
3465 		u8 pn_offs = 0;
3466 
3467 		if (tx.key &&
3468 		    (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3469 			pn_offs = ieee80211_hdrlen(hdr->frame_control);
3470 
3471 		ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3472 					   tx.key, skb);
3473 	} else {
3474 		if (invoke_tx_handlers_late(&tx))
3475 			goto begin;
3476 
3477 		skb = __skb_dequeue(&tx.skbs);
3478 
3479 		if (!skb_queue_empty(&tx.skbs))
3480 			skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3481 	}
3482 
3483 	if (skb && skb_has_frag_list(skb) &&
3484 	    !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3485 		if (skb_linearize(skb)) {
3486 			ieee80211_free_txskb(&local->hw, skb);
3487 			goto begin;
3488 		}
3489 	}
3490 
3491 out:
3492 	spin_unlock_bh(&fq->lock);
3493 
3494 	return skb;
3495 }
3496 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3497 
3498 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3499 				  struct net_device *dev,
3500 				  u32 info_flags)
3501 {
3502 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3503 	struct sta_info *sta;
3504 	struct sk_buff *next;
3505 
3506 	if (unlikely(skb->len < ETH_HLEN)) {
3507 		kfree_skb(skb);
3508 		return;
3509 	}
3510 
3511 	rcu_read_lock();
3512 
3513 	if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3514 		goto out_free;
3515 
3516 	if (!IS_ERR_OR_NULL(sta)) {
3517 		struct ieee80211_fast_tx *fast_tx;
3518 
3519 		fast_tx = rcu_dereference(sta->fast_tx);
3520 
3521 		if (fast_tx &&
3522 		    ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
3523 			goto out;
3524 	}
3525 
3526 	if (skb_is_gso(skb)) {
3527 		struct sk_buff *segs;
3528 
3529 		segs = skb_gso_segment(skb, 0);
3530 		if (IS_ERR(segs)) {
3531 			goto out_free;
3532 		} else if (segs) {
3533 			consume_skb(skb);
3534 			skb = segs;
3535 		}
3536 	} else {
3537 		/* we cannot process non-linear frames on this path */
3538 		if (skb_linearize(skb)) {
3539 			kfree_skb(skb);
3540 			goto out;
3541 		}
3542 
3543 		/* the frame could be fragmented, software-encrypted, and other
3544 		 * things so we cannot really handle checksum offload with it -
3545 		 * fix it up in software before we handle anything else.
3546 		 */
3547 		if (skb->ip_summed == CHECKSUM_PARTIAL) {
3548 			skb_set_transport_header(skb,
3549 						 skb_checksum_start_offset(skb));
3550 			if (skb_checksum_help(skb))
3551 				goto out_free;
3552 		}
3553 	}
3554 
3555 	next = skb;
3556 	while (next) {
3557 		skb = next;
3558 		next = skb->next;
3559 
3560 		skb->prev = NULL;
3561 		skb->next = NULL;
3562 
3563 		skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3564 		if (IS_ERR(skb))
3565 			goto out;
3566 
3567 		ieee80211_tx_stats(dev, skb->len);
3568 
3569 		ieee80211_xmit(sdata, sta, skb);
3570 	}
3571 	goto out;
3572  out_free:
3573 	kfree_skb(skb);
3574  out:
3575 	rcu_read_unlock();
3576 }
3577 
3578 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
3579 {
3580 	struct ethhdr *eth;
3581 	int err;
3582 
3583 	err = skb_ensure_writable(skb, ETH_HLEN);
3584 	if (unlikely(err))
3585 		return err;
3586 
3587 	eth = (void *)skb->data;
3588 	ether_addr_copy(eth->h_dest, sta->sta.addr);
3589 
3590 	return 0;
3591 }
3592 
3593 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
3594 					   struct net_device *dev)
3595 {
3596 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3597 	const struct ethhdr *eth = (void *)skb->data;
3598 	const struct vlan_ethhdr *ethvlan = (void *)skb->data;
3599 	__be16 ethertype;
3600 
3601 	if (likely(!is_multicast_ether_addr(eth->h_dest)))
3602 		return false;
3603 
3604 	switch (sdata->vif.type) {
3605 	case NL80211_IFTYPE_AP_VLAN:
3606 		if (sdata->u.vlan.sta)
3607 			return false;
3608 		if (sdata->wdev.use_4addr)
3609 			return false;
3610 		/* fall through */
3611 	case NL80211_IFTYPE_AP:
3612 		/* check runtime toggle for this bss */
3613 		if (!sdata->bss->multicast_to_unicast)
3614 			return false;
3615 		break;
3616 	default:
3617 		return false;
3618 	}
3619 
3620 	/* multicast to unicast conversion only for some payload */
3621 	ethertype = eth->h_proto;
3622 	if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
3623 		ethertype = ethvlan->h_vlan_encapsulated_proto;
3624 	switch (ethertype) {
3625 	case htons(ETH_P_ARP):
3626 	case htons(ETH_P_IP):
3627 	case htons(ETH_P_IPV6):
3628 		break;
3629 	default:
3630 		return false;
3631 	}
3632 
3633 	return true;
3634 }
3635 
3636 static void
3637 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
3638 			     struct sk_buff_head *queue)
3639 {
3640 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3641 	struct ieee80211_local *local = sdata->local;
3642 	const struct ethhdr *eth = (struct ethhdr *)skb->data;
3643 	struct sta_info *sta, *first = NULL;
3644 	struct sk_buff *cloned_skb;
3645 
3646 	rcu_read_lock();
3647 
3648 	list_for_each_entry_rcu(sta, &local->sta_list, list) {
3649 		if (sdata != sta->sdata)
3650 			/* AP-VLAN mismatch */
3651 			continue;
3652 		if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
3653 			/* do not send back to source */
3654 			continue;
3655 		if (!first) {
3656 			first = sta;
3657 			continue;
3658 		}
3659 		cloned_skb = skb_clone(skb, GFP_ATOMIC);
3660 		if (!cloned_skb)
3661 			goto multicast;
3662 		if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
3663 			dev_kfree_skb(cloned_skb);
3664 			goto multicast;
3665 		}
3666 		__skb_queue_tail(queue, cloned_skb);
3667 	}
3668 
3669 	if (likely(first)) {
3670 		if (unlikely(ieee80211_change_da(skb, first)))
3671 			goto multicast;
3672 		__skb_queue_tail(queue, skb);
3673 	} else {
3674 		/* no STA connected, drop */
3675 		kfree_skb(skb);
3676 		skb = NULL;
3677 	}
3678 
3679 	goto out;
3680 multicast:
3681 	__skb_queue_purge(queue);
3682 	__skb_queue_tail(queue, skb);
3683 out:
3684 	rcu_read_unlock();
3685 }
3686 
3687 /**
3688  * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3689  * @skb: packet to be sent
3690  * @dev: incoming interface
3691  *
3692  * On failure skb will be freed.
3693  */
3694 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3695 				       struct net_device *dev)
3696 {
3697 	if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
3698 		struct sk_buff_head queue;
3699 
3700 		__skb_queue_head_init(&queue);
3701 		ieee80211_convert_to_unicast(skb, dev, &queue);
3702 		while ((skb = __skb_dequeue(&queue)))
3703 			__ieee80211_subif_start_xmit(skb, dev, 0);
3704 	} else {
3705 		__ieee80211_subif_start_xmit(skb, dev, 0);
3706 	}
3707 
3708 	return NETDEV_TX_OK;
3709 }
3710 
3711 struct sk_buff *
3712 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3713 			      struct sk_buff *skb, u32 info_flags)
3714 {
3715 	struct ieee80211_hdr *hdr;
3716 	struct ieee80211_tx_data tx = {
3717 		.local = sdata->local,
3718 		.sdata = sdata,
3719 	};
3720 	struct sta_info *sta;
3721 
3722 	rcu_read_lock();
3723 
3724 	if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3725 		kfree_skb(skb);
3726 		skb = ERR_PTR(-EINVAL);
3727 		goto out;
3728 	}
3729 
3730 	skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3731 	if (IS_ERR(skb))
3732 		goto out;
3733 
3734 	hdr = (void *)skb->data;
3735 	tx.sta = sta_info_get(sdata, hdr->addr1);
3736 	tx.skb = skb;
3737 
3738 	if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3739 		rcu_read_unlock();
3740 		kfree_skb(skb);
3741 		return ERR_PTR(-EINVAL);
3742 	}
3743 
3744 out:
3745 	rcu_read_unlock();
3746 	return skb;
3747 }
3748 
3749 /*
3750  * ieee80211_clear_tx_pending may not be called in a context where
3751  * it is possible that it packets could come in again.
3752  */
3753 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3754 {
3755 	struct sk_buff *skb;
3756 	int i;
3757 
3758 	for (i = 0; i < local->hw.queues; i++) {
3759 		while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3760 			ieee80211_free_txskb(&local->hw, skb);
3761 	}
3762 }
3763 
3764 /*
3765  * Returns false if the frame couldn't be transmitted but was queued instead,
3766  * which in this case means re-queued -- take as an indication to stop sending
3767  * more pending frames.
3768  */
3769 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3770 				     struct sk_buff *skb)
3771 {
3772 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3773 	struct ieee80211_sub_if_data *sdata;
3774 	struct sta_info *sta;
3775 	struct ieee80211_hdr *hdr;
3776 	bool result;
3777 	struct ieee80211_chanctx_conf *chanctx_conf;
3778 
3779 	sdata = vif_to_sdata(info->control.vif);
3780 
3781 	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3782 		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3783 		if (unlikely(!chanctx_conf)) {
3784 			dev_kfree_skb(skb);
3785 			return true;
3786 		}
3787 		info->band = chanctx_conf->def.chan->band;
3788 		result = ieee80211_tx(sdata, NULL, skb, true);
3789 	} else {
3790 		struct sk_buff_head skbs;
3791 
3792 		__skb_queue_head_init(&skbs);
3793 		__skb_queue_tail(&skbs, skb);
3794 
3795 		hdr = (struct ieee80211_hdr *)skb->data;
3796 		sta = sta_info_get(sdata, hdr->addr1);
3797 
3798 		result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3799 	}
3800 
3801 	return result;
3802 }
3803 
3804 /*
3805  * Transmit all pending packets. Called from tasklet.
3806  */
3807 void ieee80211_tx_pending(unsigned long data)
3808 {
3809 	struct ieee80211_local *local = (struct ieee80211_local *)data;
3810 	unsigned long flags;
3811 	int i;
3812 	bool txok;
3813 
3814 	rcu_read_lock();
3815 
3816 	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3817 	for (i = 0; i < local->hw.queues; i++) {
3818 		/*
3819 		 * If queue is stopped by something other than due to pending
3820 		 * frames, or we have no pending frames, proceed to next queue.
3821 		 */
3822 		if (local->queue_stop_reasons[i] ||
3823 		    skb_queue_empty(&local->pending[i]))
3824 			continue;
3825 
3826 		while (!skb_queue_empty(&local->pending[i])) {
3827 			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3828 			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3829 
3830 			if (WARN_ON(!info->control.vif)) {
3831 				ieee80211_free_txskb(&local->hw, skb);
3832 				continue;
3833 			}
3834 
3835 			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3836 						flags);
3837 
3838 			txok = ieee80211_tx_pending_skb(local, skb);
3839 			spin_lock_irqsave(&local->queue_stop_reason_lock,
3840 					  flags);
3841 			if (!txok)
3842 				break;
3843 		}
3844 
3845 		if (skb_queue_empty(&local->pending[i]))
3846 			ieee80211_propagate_queue_wake(local, i);
3847 	}
3848 	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3849 
3850 	rcu_read_unlock();
3851 }
3852 
3853 /* functions for drivers to get certain frames */
3854 
3855 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3856 				       struct ps_data *ps, struct sk_buff *skb,
3857 				       bool is_template)
3858 {
3859 	u8 *pos, *tim;
3860 	int aid0 = 0;
3861 	int i, have_bits = 0, n1, n2;
3862 
3863 	/* Generate bitmap for TIM only if there are any STAs in power save
3864 	 * mode. */
3865 	if (atomic_read(&ps->num_sta_ps) > 0)
3866 		/* in the hope that this is faster than
3867 		 * checking byte-for-byte */
3868 		have_bits = !bitmap_empty((unsigned long *)ps->tim,
3869 					  IEEE80211_MAX_AID+1);
3870 	if (!is_template) {
3871 		if (ps->dtim_count == 0)
3872 			ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3873 		else
3874 			ps->dtim_count--;
3875 	}
3876 
3877 	tim = pos = skb_put(skb, 6);
3878 	*pos++ = WLAN_EID_TIM;
3879 	*pos++ = 4;
3880 	*pos++ = ps->dtim_count;
3881 	*pos++ = sdata->vif.bss_conf.dtim_period;
3882 
3883 	if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3884 		aid0 = 1;
3885 
3886 	ps->dtim_bc_mc = aid0 == 1;
3887 
3888 	if (have_bits) {
3889 		/* Find largest even number N1 so that bits numbered 1 through
3890 		 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3891 		 * (N2 + 1) x 8 through 2007 are 0. */
3892 		n1 = 0;
3893 		for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
3894 			if (ps->tim[i]) {
3895 				n1 = i & 0xfe;
3896 				break;
3897 			}
3898 		}
3899 		n2 = n1;
3900 		for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3901 			if (ps->tim[i]) {
3902 				n2 = i;
3903 				break;
3904 			}
3905 		}
3906 
3907 		/* Bitmap control */
3908 		*pos++ = n1 | aid0;
3909 		/* Part Virt Bitmap */
3910 		skb_put(skb, n2 - n1);
3911 		memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3912 
3913 		tim[1] = n2 - n1 + 4;
3914 	} else {
3915 		*pos++ = aid0; /* Bitmap control */
3916 		*pos++ = 0; /* Part Virt Bitmap */
3917 	}
3918 }
3919 
3920 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3921 				    struct ps_data *ps, struct sk_buff *skb,
3922 				    bool is_template)
3923 {
3924 	struct ieee80211_local *local = sdata->local;
3925 
3926 	/*
3927 	 * Not very nice, but we want to allow the driver to call
3928 	 * ieee80211_beacon_get() as a response to the set_tim()
3929 	 * callback. That, however, is already invoked under the
3930 	 * sta_lock to guarantee consistent and race-free update
3931 	 * of the tim bitmap in mac80211 and the driver.
3932 	 */
3933 	if (local->tim_in_locked_section) {
3934 		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3935 	} else {
3936 		spin_lock_bh(&local->tim_lock);
3937 		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3938 		spin_unlock_bh(&local->tim_lock);
3939 	}
3940 
3941 	return 0;
3942 }
3943 
3944 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3945 			      struct beacon_data *beacon)
3946 {
3947 	struct probe_resp *resp;
3948 	u8 *beacon_data;
3949 	size_t beacon_data_len;
3950 	int i;
3951 	u8 count = beacon->csa_current_counter;
3952 
3953 	switch (sdata->vif.type) {
3954 	case NL80211_IFTYPE_AP:
3955 		beacon_data = beacon->tail;
3956 		beacon_data_len = beacon->tail_len;
3957 		break;
3958 	case NL80211_IFTYPE_ADHOC:
3959 		beacon_data = beacon->head;
3960 		beacon_data_len = beacon->head_len;
3961 		break;
3962 	case NL80211_IFTYPE_MESH_POINT:
3963 		beacon_data = beacon->head;
3964 		beacon_data_len = beacon->head_len;
3965 		break;
3966 	default:
3967 		return;
3968 	}
3969 
3970 	rcu_read_lock();
3971 	for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
3972 		resp = rcu_dereference(sdata->u.ap.probe_resp);
3973 
3974 		if (beacon->csa_counter_offsets[i]) {
3975 			if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3976 					 beacon_data_len)) {
3977 				rcu_read_unlock();
3978 				return;
3979 			}
3980 
3981 			beacon_data[beacon->csa_counter_offsets[i]] = count;
3982 		}
3983 
3984 		if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3985 			resp->data[resp->csa_counter_offsets[i]] = count;
3986 	}
3987 	rcu_read_unlock();
3988 }
3989 
3990 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3991 {
3992 	beacon->csa_current_counter--;
3993 
3994 	/* the counter should never reach 0 */
3995 	WARN_ON_ONCE(!beacon->csa_current_counter);
3996 
3997 	return beacon->csa_current_counter;
3998 }
3999 
4000 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
4001 {
4002 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4003 	struct beacon_data *beacon = NULL;
4004 	u8 count = 0;
4005 
4006 	rcu_read_lock();
4007 
4008 	if (sdata->vif.type == NL80211_IFTYPE_AP)
4009 		beacon = rcu_dereference(sdata->u.ap.beacon);
4010 	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4011 		beacon = rcu_dereference(sdata->u.ibss.presp);
4012 	else if (ieee80211_vif_is_mesh(&sdata->vif))
4013 		beacon = rcu_dereference(sdata->u.mesh.beacon);
4014 
4015 	if (!beacon)
4016 		goto unlock;
4017 
4018 	count = __ieee80211_csa_update_counter(beacon);
4019 
4020 unlock:
4021 	rcu_read_unlock();
4022 	return count;
4023 }
4024 EXPORT_SYMBOL(ieee80211_csa_update_counter);
4025 
4026 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
4027 {
4028 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4029 	struct beacon_data *beacon = NULL;
4030 	u8 *beacon_data;
4031 	size_t beacon_data_len;
4032 	int ret = false;
4033 
4034 	if (!ieee80211_sdata_running(sdata))
4035 		return false;
4036 
4037 	rcu_read_lock();
4038 	if (vif->type == NL80211_IFTYPE_AP) {
4039 		struct ieee80211_if_ap *ap = &sdata->u.ap;
4040 
4041 		beacon = rcu_dereference(ap->beacon);
4042 		if (WARN_ON(!beacon || !beacon->tail))
4043 			goto out;
4044 		beacon_data = beacon->tail;
4045 		beacon_data_len = beacon->tail_len;
4046 	} else if (vif->type == NL80211_IFTYPE_ADHOC) {
4047 		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4048 
4049 		beacon = rcu_dereference(ifibss->presp);
4050 		if (!beacon)
4051 			goto out;
4052 
4053 		beacon_data = beacon->head;
4054 		beacon_data_len = beacon->head_len;
4055 	} else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
4056 		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4057 
4058 		beacon = rcu_dereference(ifmsh->beacon);
4059 		if (!beacon)
4060 			goto out;
4061 
4062 		beacon_data = beacon->head;
4063 		beacon_data_len = beacon->head_len;
4064 	} else {
4065 		WARN_ON(1);
4066 		goto out;
4067 	}
4068 
4069 	if (!beacon->csa_counter_offsets[0])
4070 		goto out;
4071 
4072 	if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
4073 		goto out;
4074 
4075 	if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
4076 		ret = true;
4077  out:
4078 	rcu_read_unlock();
4079 
4080 	return ret;
4081 }
4082 EXPORT_SYMBOL(ieee80211_csa_is_complete);
4083 
4084 static struct sk_buff *
4085 __ieee80211_beacon_get(struct ieee80211_hw *hw,
4086 		       struct ieee80211_vif *vif,
4087 		       struct ieee80211_mutable_offsets *offs,
4088 		       bool is_template)
4089 {
4090 	struct ieee80211_local *local = hw_to_local(hw);
4091 	struct beacon_data *beacon = NULL;
4092 	struct sk_buff *skb = NULL;
4093 	struct ieee80211_tx_info *info;
4094 	struct ieee80211_sub_if_data *sdata = NULL;
4095 	enum nl80211_band band;
4096 	struct ieee80211_tx_rate_control txrc;
4097 	struct ieee80211_chanctx_conf *chanctx_conf;
4098 	int csa_off_base = 0;
4099 
4100 	rcu_read_lock();
4101 
4102 	sdata = vif_to_sdata(vif);
4103 	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4104 
4105 	if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
4106 		goto out;
4107 
4108 	if (offs)
4109 		memset(offs, 0, sizeof(*offs));
4110 
4111 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
4112 		struct ieee80211_if_ap *ap = &sdata->u.ap;
4113 
4114 		beacon = rcu_dereference(ap->beacon);
4115 		if (beacon) {
4116 			if (beacon->csa_counter_offsets[0]) {
4117 				if (!is_template)
4118 					__ieee80211_csa_update_counter(beacon);
4119 
4120 				ieee80211_set_csa(sdata, beacon);
4121 			}
4122 
4123 			/*
4124 			 * headroom, head length,
4125 			 * tail length and maximum TIM length
4126 			 */
4127 			skb = dev_alloc_skb(local->tx_headroom +
4128 					    beacon->head_len +
4129 					    beacon->tail_len + 256 +
4130 					    local->hw.extra_beacon_tailroom);
4131 			if (!skb)
4132 				goto out;
4133 
4134 			skb_reserve(skb, local->tx_headroom);
4135 			skb_put_data(skb, beacon->head, beacon->head_len);
4136 
4137 			ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4138 						 is_template);
4139 
4140 			if (offs) {
4141 				offs->tim_offset = beacon->head_len;
4142 				offs->tim_length = skb->len - beacon->head_len;
4143 
4144 				/* for AP the csa offsets are from tail */
4145 				csa_off_base = skb->len;
4146 			}
4147 
4148 			if (beacon->tail)
4149 				skb_put_data(skb, beacon->tail,
4150 					     beacon->tail_len);
4151 		} else
4152 			goto out;
4153 	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
4154 		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4155 		struct ieee80211_hdr *hdr;
4156 
4157 		beacon = rcu_dereference(ifibss->presp);
4158 		if (!beacon)
4159 			goto out;
4160 
4161 		if (beacon->csa_counter_offsets[0]) {
4162 			if (!is_template)
4163 				__ieee80211_csa_update_counter(beacon);
4164 
4165 			ieee80211_set_csa(sdata, beacon);
4166 		}
4167 
4168 		skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
4169 				    local->hw.extra_beacon_tailroom);
4170 		if (!skb)
4171 			goto out;
4172 		skb_reserve(skb, local->tx_headroom);
4173 		skb_put_data(skb, beacon->head, beacon->head_len);
4174 
4175 		hdr = (struct ieee80211_hdr *) skb->data;
4176 		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4177 						 IEEE80211_STYPE_BEACON);
4178 	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4179 		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4180 
4181 		beacon = rcu_dereference(ifmsh->beacon);
4182 		if (!beacon)
4183 			goto out;
4184 
4185 		if (beacon->csa_counter_offsets[0]) {
4186 			if (!is_template)
4187 				/* TODO: For mesh csa_counter is in TU, so
4188 				 * decrementing it by one isn't correct, but
4189 				 * for now we leave it consistent with overall
4190 				 * mac80211's behavior.
4191 				 */
4192 				__ieee80211_csa_update_counter(beacon);
4193 
4194 			ieee80211_set_csa(sdata, beacon);
4195 		}
4196 
4197 		if (ifmsh->sync_ops)
4198 			ifmsh->sync_ops->adjust_tsf(sdata, beacon);
4199 
4200 		skb = dev_alloc_skb(local->tx_headroom +
4201 				    beacon->head_len +
4202 				    256 + /* TIM IE */
4203 				    beacon->tail_len +
4204 				    local->hw.extra_beacon_tailroom);
4205 		if (!skb)
4206 			goto out;
4207 		skb_reserve(skb, local->tx_headroom);
4208 		skb_put_data(skb, beacon->head, beacon->head_len);
4209 		ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4210 
4211 		if (offs) {
4212 			offs->tim_offset = beacon->head_len;
4213 			offs->tim_length = skb->len - beacon->head_len;
4214 		}
4215 
4216 		skb_put_data(skb, beacon->tail, beacon->tail_len);
4217 	} else {
4218 		WARN_ON(1);
4219 		goto out;
4220 	}
4221 
4222 	/* CSA offsets */
4223 	if (offs && beacon) {
4224 		int i;
4225 
4226 		for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
4227 			u16 csa_off = beacon->csa_counter_offsets[i];
4228 
4229 			if (!csa_off)
4230 				continue;
4231 
4232 			offs->csa_counter_offs[i] = csa_off_base + csa_off;
4233 		}
4234 	}
4235 
4236 	band = chanctx_conf->def.chan->band;
4237 
4238 	info = IEEE80211_SKB_CB(skb);
4239 
4240 	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4241 	info->flags |= IEEE80211_TX_CTL_NO_ACK;
4242 	info->band = band;
4243 
4244 	memset(&txrc, 0, sizeof(txrc));
4245 	txrc.hw = hw;
4246 	txrc.sband = local->hw.wiphy->bands[band];
4247 	txrc.bss_conf = &sdata->vif.bss_conf;
4248 	txrc.skb = skb;
4249 	txrc.reported_rate.idx = -1;
4250 	txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
4251 	txrc.bss = true;
4252 	rate_control_get_rate(sdata, NULL, &txrc);
4253 
4254 	info->control.vif = vif;
4255 
4256 	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4257 			IEEE80211_TX_CTL_ASSIGN_SEQ |
4258 			IEEE80211_TX_CTL_FIRST_FRAGMENT;
4259  out:
4260 	rcu_read_unlock();
4261 	return skb;
4262 
4263 }
4264 
4265 struct sk_buff *
4266 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4267 			      struct ieee80211_vif *vif,
4268 			      struct ieee80211_mutable_offsets *offs)
4269 {
4270 	return __ieee80211_beacon_get(hw, vif, offs, true);
4271 }
4272 EXPORT_SYMBOL(ieee80211_beacon_get_template);
4273 
4274 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4275 					 struct ieee80211_vif *vif,
4276 					 u16 *tim_offset, u16 *tim_length)
4277 {
4278 	struct ieee80211_mutable_offsets offs = {};
4279 	struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
4280 	struct sk_buff *copy;
4281 	struct ieee80211_supported_band *sband;
4282 	int shift;
4283 
4284 	if (!bcn)
4285 		return bcn;
4286 
4287 	if (tim_offset)
4288 		*tim_offset = offs.tim_offset;
4289 
4290 	if (tim_length)
4291 		*tim_length = offs.tim_length;
4292 
4293 	if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4294 	    !hw_to_local(hw)->monitors)
4295 		return bcn;
4296 
4297 	/* send a copy to monitor interfaces */
4298 	copy = skb_copy(bcn, GFP_ATOMIC);
4299 	if (!copy)
4300 		return bcn;
4301 
4302 	shift = ieee80211_vif_get_shift(vif);
4303 	sband = ieee80211_get_sband(vif_to_sdata(vif));
4304 	if (!sband)
4305 		return bcn;
4306 
4307 	ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4308 
4309 	return bcn;
4310 }
4311 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4312 
4313 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4314 					struct ieee80211_vif *vif)
4315 {
4316 	struct ieee80211_if_ap *ap = NULL;
4317 	struct sk_buff *skb = NULL;
4318 	struct probe_resp *presp = NULL;
4319 	struct ieee80211_hdr *hdr;
4320 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4321 
4322 	if (sdata->vif.type != NL80211_IFTYPE_AP)
4323 		return NULL;
4324 
4325 	rcu_read_lock();
4326 
4327 	ap = &sdata->u.ap;
4328 	presp = rcu_dereference(ap->probe_resp);
4329 	if (!presp)
4330 		goto out;
4331 
4332 	skb = dev_alloc_skb(presp->len);
4333 	if (!skb)
4334 		goto out;
4335 
4336 	skb_put_data(skb, presp->data, presp->len);
4337 
4338 	hdr = (struct ieee80211_hdr *) skb->data;
4339 	memset(hdr->addr1, 0, sizeof(hdr->addr1));
4340 
4341 out:
4342 	rcu_read_unlock();
4343 	return skb;
4344 }
4345 EXPORT_SYMBOL(ieee80211_proberesp_get);
4346 
4347 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4348 				     struct ieee80211_vif *vif)
4349 {
4350 	struct ieee80211_sub_if_data *sdata;
4351 	struct ieee80211_if_managed *ifmgd;
4352 	struct ieee80211_pspoll *pspoll;
4353 	struct ieee80211_local *local;
4354 	struct sk_buff *skb;
4355 
4356 	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4357 		return NULL;
4358 
4359 	sdata = vif_to_sdata(vif);
4360 	ifmgd = &sdata->u.mgd;
4361 	local = sdata->local;
4362 
4363 	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4364 	if (!skb)
4365 		return NULL;
4366 
4367 	skb_reserve(skb, local->hw.extra_tx_headroom);
4368 
4369 	pspoll = skb_put_zero(skb, sizeof(*pspoll));
4370 	pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4371 					    IEEE80211_STYPE_PSPOLL);
4372 	pspoll->aid = cpu_to_le16(ifmgd->aid);
4373 
4374 	/* aid in PS-Poll has its two MSBs each set to 1 */
4375 	pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4376 
4377 	memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4378 	memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4379 
4380 	return skb;
4381 }
4382 EXPORT_SYMBOL(ieee80211_pspoll_get);
4383 
4384 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4385 				       struct ieee80211_vif *vif)
4386 {
4387 	struct ieee80211_hdr_3addr *nullfunc;
4388 	struct ieee80211_sub_if_data *sdata;
4389 	struct ieee80211_if_managed *ifmgd;
4390 	struct ieee80211_local *local;
4391 	struct sk_buff *skb;
4392 
4393 	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4394 		return NULL;
4395 
4396 	sdata = vif_to_sdata(vif);
4397 	ifmgd = &sdata->u.mgd;
4398 	local = sdata->local;
4399 
4400 	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
4401 	if (!skb)
4402 		return NULL;
4403 
4404 	skb_reserve(skb, local->hw.extra_tx_headroom);
4405 
4406 	nullfunc = skb_put_zero(skb, sizeof(*nullfunc));
4407 	nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4408 					      IEEE80211_STYPE_NULLFUNC |
4409 					      IEEE80211_FCTL_TODS);
4410 	memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4411 	memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4412 	memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4413 
4414 	return skb;
4415 }
4416 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4417 
4418 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4419 				       const u8 *src_addr,
4420 				       const u8 *ssid, size_t ssid_len,
4421 				       size_t tailroom)
4422 {
4423 	struct ieee80211_local *local = hw_to_local(hw);
4424 	struct ieee80211_hdr_3addr *hdr;
4425 	struct sk_buff *skb;
4426 	size_t ie_ssid_len;
4427 	u8 *pos;
4428 
4429 	ie_ssid_len = 2 + ssid_len;
4430 
4431 	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4432 			    ie_ssid_len + tailroom);
4433 	if (!skb)
4434 		return NULL;
4435 
4436 	skb_reserve(skb, local->hw.extra_tx_headroom);
4437 
4438 	hdr = skb_put_zero(skb, sizeof(*hdr));
4439 	hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4440 					 IEEE80211_STYPE_PROBE_REQ);
4441 	eth_broadcast_addr(hdr->addr1);
4442 	memcpy(hdr->addr2, src_addr, ETH_ALEN);
4443 	eth_broadcast_addr(hdr->addr3);
4444 
4445 	pos = skb_put(skb, ie_ssid_len);
4446 	*pos++ = WLAN_EID_SSID;
4447 	*pos++ = ssid_len;
4448 	if (ssid_len)
4449 		memcpy(pos, ssid, ssid_len);
4450 	pos += ssid_len;
4451 
4452 	return skb;
4453 }
4454 EXPORT_SYMBOL(ieee80211_probereq_get);
4455 
4456 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4457 		       const void *frame, size_t frame_len,
4458 		       const struct ieee80211_tx_info *frame_txctl,
4459 		       struct ieee80211_rts *rts)
4460 {
4461 	const struct ieee80211_hdr *hdr = frame;
4462 
4463 	rts->frame_control =
4464 	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4465 	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4466 					       frame_txctl);
4467 	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4468 	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4469 }
4470 EXPORT_SYMBOL(ieee80211_rts_get);
4471 
4472 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4473 			     const void *frame, size_t frame_len,
4474 			     const struct ieee80211_tx_info *frame_txctl,
4475 			     struct ieee80211_cts *cts)
4476 {
4477 	const struct ieee80211_hdr *hdr = frame;
4478 
4479 	cts->frame_control =
4480 	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4481 	cts->duration = ieee80211_ctstoself_duration(hw, vif,
4482 						     frame_len, frame_txctl);
4483 	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4484 }
4485 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4486 
4487 struct sk_buff *
4488 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4489 			  struct ieee80211_vif *vif)
4490 {
4491 	struct ieee80211_local *local = hw_to_local(hw);
4492 	struct sk_buff *skb = NULL;
4493 	struct ieee80211_tx_data tx;
4494 	struct ieee80211_sub_if_data *sdata;
4495 	struct ps_data *ps;
4496 	struct ieee80211_tx_info *info;
4497 	struct ieee80211_chanctx_conf *chanctx_conf;
4498 
4499 	sdata = vif_to_sdata(vif);
4500 
4501 	rcu_read_lock();
4502 	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4503 
4504 	if (!chanctx_conf)
4505 		goto out;
4506 
4507 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
4508 		struct beacon_data *beacon =
4509 				rcu_dereference(sdata->u.ap.beacon);
4510 
4511 		if (!beacon || !beacon->head)
4512 			goto out;
4513 
4514 		ps = &sdata->u.ap.ps;
4515 	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4516 		ps = &sdata->u.mesh.ps;
4517 	} else {
4518 		goto out;
4519 	}
4520 
4521 	if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4522 		goto out; /* send buffered bc/mc only after DTIM beacon */
4523 
4524 	while (1) {
4525 		skb = skb_dequeue(&ps->bc_buf);
4526 		if (!skb)
4527 			goto out;
4528 		local->total_ps_buffered--;
4529 
4530 		if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4531 			struct ieee80211_hdr *hdr =
4532 				(struct ieee80211_hdr *) skb->data;
4533 			/* more buffered multicast/broadcast frames ==> set
4534 			 * MoreData flag in IEEE 802.11 header to inform PS
4535 			 * STAs */
4536 			hdr->frame_control |=
4537 				cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4538 		}
4539 
4540 		if (sdata->vif.type == NL80211_IFTYPE_AP)
4541 			sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4542 		if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4543 			break;
4544 		ieee80211_free_txskb(hw, skb);
4545 	}
4546 
4547 	info = IEEE80211_SKB_CB(skb);
4548 
4549 	tx.flags |= IEEE80211_TX_PS_BUFFERED;
4550 	info->band = chanctx_conf->def.chan->band;
4551 
4552 	if (invoke_tx_handlers(&tx))
4553 		skb = NULL;
4554  out:
4555 	rcu_read_unlock();
4556 
4557 	return skb;
4558 }
4559 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4560 
4561 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4562 {
4563 	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4564 	struct ieee80211_sub_if_data *sdata = sta->sdata;
4565 	struct ieee80211_local *local = sdata->local;
4566 	int ret;
4567 	u32 queues;
4568 
4569 	lockdep_assert_held(&local->sta_mtx);
4570 
4571 	/* only some cases are supported right now */
4572 	switch (sdata->vif.type) {
4573 	case NL80211_IFTYPE_STATION:
4574 	case NL80211_IFTYPE_AP:
4575 	case NL80211_IFTYPE_AP_VLAN:
4576 		break;
4577 	default:
4578 		WARN_ON(1);
4579 		return -EINVAL;
4580 	}
4581 
4582 	if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4583 		return -EINVAL;
4584 
4585 	if (sta->reserved_tid == tid) {
4586 		ret = 0;
4587 		goto out;
4588 	}
4589 
4590 	if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4591 		sdata_err(sdata, "TID reservation already active\n");
4592 		ret = -EALREADY;
4593 		goto out;
4594 	}
4595 
4596 	ieee80211_stop_vif_queues(sdata->local, sdata,
4597 				  IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4598 
4599 	synchronize_net();
4600 
4601 	/* Tear down BA sessions so we stop aggregating on this TID */
4602 	if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4603 		set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4604 		__ieee80211_stop_tx_ba_session(sta, tid,
4605 					       AGG_STOP_LOCAL_REQUEST);
4606 	}
4607 
4608 	queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4609 	__ieee80211_flush_queues(local, sdata, queues, false);
4610 
4611 	sta->reserved_tid = tid;
4612 
4613 	ieee80211_wake_vif_queues(local, sdata,
4614 				  IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4615 
4616 	if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4617 		clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4618 
4619 	ret = 0;
4620  out:
4621 	return ret;
4622 }
4623 EXPORT_SYMBOL(ieee80211_reserve_tid);
4624 
4625 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4626 {
4627 	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4628 	struct ieee80211_sub_if_data *sdata = sta->sdata;
4629 
4630 	lockdep_assert_held(&sdata->local->sta_mtx);
4631 
4632 	/* only some cases are supported right now */
4633 	switch (sdata->vif.type) {
4634 	case NL80211_IFTYPE_STATION:
4635 	case NL80211_IFTYPE_AP:
4636 	case NL80211_IFTYPE_AP_VLAN:
4637 		break;
4638 	default:
4639 		WARN_ON(1);
4640 		return;
4641 	}
4642 
4643 	if (tid != sta->reserved_tid) {
4644 		sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4645 		return;
4646 	}
4647 
4648 	sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4649 }
4650 EXPORT_SYMBOL(ieee80211_unreserve_tid);
4651 
4652 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4653 				 struct sk_buff *skb, int tid,
4654 				 enum nl80211_band band)
4655 {
4656 	int ac = ieee80211_ac_from_tid(tid);
4657 
4658 	skb_reset_mac_header(skb);
4659 	skb_set_queue_mapping(skb, ac);
4660 	skb->priority = tid;
4661 
4662 	skb->dev = sdata->dev;
4663 
4664 	/*
4665 	 * The other path calling ieee80211_xmit is from the tasklet,
4666 	 * and while we can handle concurrent transmissions locking
4667 	 * requirements are that we do not come into tx with bhs on.
4668 	 */
4669 	local_bh_disable();
4670 	IEEE80211_SKB_CB(skb)->band = band;
4671 	ieee80211_xmit(sdata, NULL, skb);
4672 	local_bh_enable();
4673 }
4674