xref: /openbmc/linux/net/mac80211/tx.c (revision ae3473231e77a3f1909d48cd144cebe5e1d049b3)
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/etherdevice.h>
20 #include <linux/bitmap.h>
21 #include <linux/rcupdate.h>
22 #include <linux/export.h>
23 #include <net/net_namespace.h>
24 #include <net/ieee80211_radiotap.h>
25 #include <net/cfg80211.h>
26 #include <net/mac80211.h>
27 #include <net/codel.h>
28 #include <net/codel_impl.h>
29 #include <asm/unaligned.h>
30 #include <net/fq_impl.h>
31 
32 #include "ieee80211_i.h"
33 #include "driver-ops.h"
34 #include "led.h"
35 #include "mesh.h"
36 #include "wep.h"
37 #include "wpa.h"
38 #include "wme.h"
39 #include "rate.h"
40 
41 /* misc utils */
42 
43 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
44 {
45 	struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
46 
47 	u64_stats_update_begin(&tstats->syncp);
48 	tstats->tx_packets++;
49 	tstats->tx_bytes += len;
50 	u64_stats_update_end(&tstats->syncp);
51 }
52 
53 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
54 				 struct sk_buff *skb, int group_addr,
55 				 int next_frag_len)
56 {
57 	int rate, mrate, erp, dur, i, shift = 0;
58 	struct ieee80211_rate *txrate;
59 	struct ieee80211_local *local = tx->local;
60 	struct ieee80211_supported_band *sband;
61 	struct ieee80211_hdr *hdr;
62 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
63 	struct ieee80211_chanctx_conf *chanctx_conf;
64 	u32 rate_flags = 0;
65 
66 	rcu_read_lock();
67 	chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
68 	if (chanctx_conf) {
69 		shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
70 		rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
71 	}
72 	rcu_read_unlock();
73 
74 	/* assume HW handles this */
75 	if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
76 		return 0;
77 
78 	/* uh huh? */
79 	if (WARN_ON_ONCE(tx->rate.idx < 0))
80 		return 0;
81 
82 	sband = local->hw.wiphy->bands[info->band];
83 	txrate = &sband->bitrates[tx->rate.idx];
84 
85 	erp = txrate->flags & IEEE80211_RATE_ERP_G;
86 
87 	/*
88 	 * data and mgmt (except PS Poll):
89 	 * - during CFP: 32768
90 	 * - during contention period:
91 	 *   if addr1 is group address: 0
92 	 *   if more fragments = 0 and addr1 is individual address: time to
93 	 *      transmit one ACK plus SIFS
94 	 *   if more fragments = 1 and addr1 is individual address: time to
95 	 *      transmit next fragment plus 2 x ACK plus 3 x SIFS
96 	 *
97 	 * IEEE 802.11, 9.6:
98 	 * - control response frame (CTS or ACK) shall be transmitted using the
99 	 *   same rate as the immediately previous frame in the frame exchange
100 	 *   sequence, if this rate belongs to the PHY mandatory rates, or else
101 	 *   at the highest possible rate belonging to the PHY rates in the
102 	 *   BSSBasicRateSet
103 	 */
104 	hdr = (struct ieee80211_hdr *)skb->data;
105 	if (ieee80211_is_ctl(hdr->frame_control)) {
106 		/* TODO: These control frames are not currently sent by
107 		 * mac80211, but should they be implemented, this function
108 		 * needs to be updated to support duration field calculation.
109 		 *
110 		 * RTS: time needed to transmit pending data/mgmt frame plus
111 		 *    one CTS frame plus one ACK frame plus 3 x SIFS
112 		 * CTS: duration of immediately previous RTS minus time
113 		 *    required to transmit CTS and its SIFS
114 		 * ACK: 0 if immediately previous directed data/mgmt had
115 		 *    more=0, with more=1 duration in ACK frame is duration
116 		 *    from previous frame minus time needed to transmit ACK
117 		 *    and its SIFS
118 		 * PS Poll: BIT(15) | BIT(14) | aid
119 		 */
120 		return 0;
121 	}
122 
123 	/* data/mgmt */
124 	if (0 /* FIX: data/mgmt during CFP */)
125 		return cpu_to_le16(32768);
126 
127 	if (group_addr) /* Group address as the destination - no ACK */
128 		return 0;
129 
130 	/* Individual destination address:
131 	 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
132 	 * CTS and ACK frames shall be transmitted using the highest rate in
133 	 * basic rate set that is less than or equal to the rate of the
134 	 * immediately previous frame and that is using the same modulation
135 	 * (CCK or OFDM). If no basic rate set matches with these requirements,
136 	 * the highest mandatory rate of the PHY that is less than or equal to
137 	 * the rate of the previous frame is used.
138 	 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
139 	 */
140 	rate = -1;
141 	/* use lowest available if everything fails */
142 	mrate = sband->bitrates[0].bitrate;
143 	for (i = 0; i < sband->n_bitrates; i++) {
144 		struct ieee80211_rate *r = &sband->bitrates[i];
145 
146 		if (r->bitrate > txrate->bitrate)
147 			break;
148 
149 		if ((rate_flags & r->flags) != rate_flags)
150 			continue;
151 
152 		if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
153 			rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
154 
155 		switch (sband->band) {
156 		case NL80211_BAND_2GHZ: {
157 			u32 flag;
158 			if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
159 				flag = IEEE80211_RATE_MANDATORY_G;
160 			else
161 				flag = IEEE80211_RATE_MANDATORY_B;
162 			if (r->flags & flag)
163 				mrate = r->bitrate;
164 			break;
165 		}
166 		case NL80211_BAND_5GHZ:
167 			if (r->flags & IEEE80211_RATE_MANDATORY_A)
168 				mrate = r->bitrate;
169 			break;
170 		case NL80211_BAND_60GHZ:
171 			/* TODO, for now fall through */
172 		case NUM_NL80211_BANDS:
173 			WARN_ON(1);
174 			break;
175 		}
176 	}
177 	if (rate == -1) {
178 		/* No matching basic rate found; use highest suitable mandatory
179 		 * PHY rate */
180 		rate = DIV_ROUND_UP(mrate, 1 << shift);
181 	}
182 
183 	/* Don't calculate ACKs for QoS Frames with NoAck Policy set */
184 	if (ieee80211_is_data_qos(hdr->frame_control) &&
185 	    *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
186 		dur = 0;
187 	else
188 		/* Time needed to transmit ACK
189 		 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
190 		 * to closest integer */
191 		dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
192 				tx->sdata->vif.bss_conf.use_short_preamble,
193 				shift);
194 
195 	if (next_frag_len) {
196 		/* Frame is fragmented: duration increases with time needed to
197 		 * transmit next fragment plus ACK and 2 x SIFS. */
198 		dur *= 2; /* ACK + SIFS */
199 		/* next fragment */
200 		dur += ieee80211_frame_duration(sband->band, next_frag_len,
201 				txrate->bitrate, erp,
202 				tx->sdata->vif.bss_conf.use_short_preamble,
203 				shift);
204 	}
205 
206 	return cpu_to_le16(dur);
207 }
208 
209 /* tx handlers */
210 static ieee80211_tx_result debug_noinline
211 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
212 {
213 	struct ieee80211_local *local = tx->local;
214 	struct ieee80211_if_managed *ifmgd;
215 
216 	/* driver doesn't support power save */
217 	if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
218 		return TX_CONTINUE;
219 
220 	/* hardware does dynamic power save */
221 	if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
222 		return TX_CONTINUE;
223 
224 	/* dynamic power save disabled */
225 	if (local->hw.conf.dynamic_ps_timeout <= 0)
226 		return TX_CONTINUE;
227 
228 	/* we are scanning, don't enable power save */
229 	if (local->scanning)
230 		return TX_CONTINUE;
231 
232 	if (!local->ps_sdata)
233 		return TX_CONTINUE;
234 
235 	/* No point if we're going to suspend */
236 	if (local->quiescing)
237 		return TX_CONTINUE;
238 
239 	/* dynamic ps is supported only in managed mode */
240 	if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
241 		return TX_CONTINUE;
242 
243 	ifmgd = &tx->sdata->u.mgd;
244 
245 	/*
246 	 * Don't wakeup from power save if u-apsd is enabled, voip ac has
247 	 * u-apsd enabled and the frame is in voip class. This effectively
248 	 * means that even if all access categories have u-apsd enabled, in
249 	 * practise u-apsd is only used with the voip ac. This is a
250 	 * workaround for the case when received voip class packets do not
251 	 * have correct qos tag for some reason, due the network or the
252 	 * peer application.
253 	 *
254 	 * Note: ifmgd->uapsd_queues access is racy here. If the value is
255 	 * changed via debugfs, user needs to reassociate manually to have
256 	 * everything in sync.
257 	 */
258 	if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
259 	    (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
260 	    skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
261 		return TX_CONTINUE;
262 
263 	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
264 		ieee80211_stop_queues_by_reason(&local->hw,
265 						IEEE80211_MAX_QUEUE_MAP,
266 						IEEE80211_QUEUE_STOP_REASON_PS,
267 						false);
268 		ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
269 		ieee80211_queue_work(&local->hw,
270 				     &local->dynamic_ps_disable_work);
271 	}
272 
273 	/* Don't restart the timer if we're not disassociated */
274 	if (!ifmgd->associated)
275 		return TX_CONTINUE;
276 
277 	mod_timer(&local->dynamic_ps_timer, jiffies +
278 		  msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
279 
280 	return TX_CONTINUE;
281 }
282 
283 static ieee80211_tx_result debug_noinline
284 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
285 {
286 
287 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
288 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
289 	bool assoc = false;
290 
291 	if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
292 		return TX_CONTINUE;
293 
294 	if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
295 	    test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
296 	    !ieee80211_is_probe_req(hdr->frame_control) &&
297 	    !ieee80211_is_nullfunc(hdr->frame_control))
298 		/*
299 		 * When software scanning only nullfunc frames (to notify
300 		 * the sleep state to the AP) and probe requests (for the
301 		 * active scan) are allowed, all other frames should not be
302 		 * sent and we should not get here, but if we do
303 		 * nonetheless, drop them to avoid sending them
304 		 * off-channel. See the link below and
305 		 * ieee80211_start_scan() for more.
306 		 *
307 		 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
308 		 */
309 		return TX_DROP;
310 
311 	if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
312 		return TX_CONTINUE;
313 
314 	if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
315 		return TX_CONTINUE;
316 
317 	if (tx->flags & IEEE80211_TX_PS_BUFFERED)
318 		return TX_CONTINUE;
319 
320 	if (tx->sta)
321 		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
322 
323 	if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
324 		if (unlikely(!assoc &&
325 			     ieee80211_is_data(hdr->frame_control))) {
326 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
327 			sdata_info(tx->sdata,
328 				   "dropped data frame to not associated station %pM\n",
329 				   hdr->addr1);
330 #endif
331 			I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
332 			return TX_DROP;
333 		}
334 	} else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
335 			    ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
336 		/*
337 		 * No associated STAs - no need to send multicast
338 		 * frames.
339 		 */
340 		return TX_DROP;
341 	}
342 
343 	return TX_CONTINUE;
344 }
345 
346 /* This function is called whenever the AP is about to exceed the maximum limit
347  * of buffered frames for power saving STAs. This situation should not really
348  * happen often during normal operation, so dropping the oldest buffered packet
349  * from each queue should be OK to make some room for new frames. */
350 static void purge_old_ps_buffers(struct ieee80211_local *local)
351 {
352 	int total = 0, purged = 0;
353 	struct sk_buff *skb;
354 	struct ieee80211_sub_if_data *sdata;
355 	struct sta_info *sta;
356 
357 	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
358 		struct ps_data *ps;
359 
360 		if (sdata->vif.type == NL80211_IFTYPE_AP)
361 			ps = &sdata->u.ap.ps;
362 		else if (ieee80211_vif_is_mesh(&sdata->vif))
363 			ps = &sdata->u.mesh.ps;
364 		else
365 			continue;
366 
367 		skb = skb_dequeue(&ps->bc_buf);
368 		if (skb) {
369 			purged++;
370 			ieee80211_free_txskb(&local->hw, skb);
371 		}
372 		total += skb_queue_len(&ps->bc_buf);
373 	}
374 
375 	/*
376 	 * Drop one frame from each station from the lowest-priority
377 	 * AC that has frames at all.
378 	 */
379 	list_for_each_entry_rcu(sta, &local->sta_list, list) {
380 		int ac;
381 
382 		for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
383 			skb = skb_dequeue(&sta->ps_tx_buf[ac]);
384 			total += skb_queue_len(&sta->ps_tx_buf[ac]);
385 			if (skb) {
386 				purged++;
387 				ieee80211_free_txskb(&local->hw, skb);
388 				break;
389 			}
390 		}
391 	}
392 
393 	local->total_ps_buffered = total;
394 	ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
395 }
396 
397 static ieee80211_tx_result
398 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
399 {
400 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
401 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
402 	struct ps_data *ps;
403 
404 	/*
405 	 * broadcast/multicast frame
406 	 *
407 	 * If any of the associated/peer stations is in power save mode,
408 	 * the frame is buffered to be sent after DTIM beacon frame.
409 	 * This is done either by the hardware or us.
410 	 */
411 
412 	/* powersaving STAs currently only in AP/VLAN/mesh mode */
413 	if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
414 	    tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
415 		if (!tx->sdata->bss)
416 			return TX_CONTINUE;
417 
418 		ps = &tx->sdata->bss->ps;
419 	} else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
420 		ps = &tx->sdata->u.mesh.ps;
421 	} else {
422 		return TX_CONTINUE;
423 	}
424 
425 
426 	/* no buffering for ordered frames */
427 	if (ieee80211_has_order(hdr->frame_control))
428 		return TX_CONTINUE;
429 
430 	if (ieee80211_is_probe_req(hdr->frame_control))
431 		return TX_CONTINUE;
432 
433 	if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
434 		info->hw_queue = tx->sdata->vif.cab_queue;
435 
436 	/* no stations in PS mode */
437 	if (!atomic_read(&ps->num_sta_ps))
438 		return TX_CONTINUE;
439 
440 	info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
441 
442 	/* device releases frame after DTIM beacon */
443 	if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
444 		return TX_CONTINUE;
445 
446 	/* buffered in mac80211 */
447 	if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
448 		purge_old_ps_buffers(tx->local);
449 
450 	if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
451 		ps_dbg(tx->sdata,
452 		       "BC TX buffer full - dropping the oldest frame\n");
453 		ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
454 	} else
455 		tx->local->total_ps_buffered++;
456 
457 	skb_queue_tail(&ps->bc_buf, tx->skb);
458 
459 	return TX_QUEUED;
460 }
461 
462 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
463 			     struct sk_buff *skb)
464 {
465 	if (!ieee80211_is_mgmt(fc))
466 		return 0;
467 
468 	if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
469 		return 0;
470 
471 	if (!ieee80211_is_robust_mgmt_frame(skb))
472 		return 0;
473 
474 	return 1;
475 }
476 
477 static ieee80211_tx_result
478 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
479 {
480 	struct sta_info *sta = tx->sta;
481 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
482 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
483 	struct ieee80211_local *local = tx->local;
484 
485 	if (unlikely(!sta))
486 		return TX_CONTINUE;
487 
488 	if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
489 		      test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
490 		      test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
491 		     !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
492 		int ac = skb_get_queue_mapping(tx->skb);
493 
494 		if (ieee80211_is_mgmt(hdr->frame_control) &&
495 		    !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
496 			info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
497 			return TX_CONTINUE;
498 		}
499 
500 		ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
501 		       sta->sta.addr, sta->sta.aid, ac);
502 		if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
503 			purge_old_ps_buffers(tx->local);
504 
505 		/* sync with ieee80211_sta_ps_deliver_wakeup */
506 		spin_lock(&sta->ps_lock);
507 		/*
508 		 * STA woke up the meantime and all the frames on ps_tx_buf have
509 		 * been queued to pending queue. No reordering can happen, go
510 		 * ahead and Tx the packet.
511 		 */
512 		if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
513 		    !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
514 		    !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
515 			spin_unlock(&sta->ps_lock);
516 			return TX_CONTINUE;
517 		}
518 
519 		if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
520 			struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
521 			ps_dbg(tx->sdata,
522 			       "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
523 			       sta->sta.addr, ac);
524 			ieee80211_free_txskb(&local->hw, old);
525 		} else
526 			tx->local->total_ps_buffered++;
527 
528 		info->control.jiffies = jiffies;
529 		info->control.vif = &tx->sdata->vif;
530 		info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
531 		info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
532 		skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
533 		spin_unlock(&sta->ps_lock);
534 
535 		if (!timer_pending(&local->sta_cleanup))
536 			mod_timer(&local->sta_cleanup,
537 				  round_jiffies(jiffies +
538 						STA_INFO_CLEANUP_INTERVAL));
539 
540 		/*
541 		 * We queued up some frames, so the TIM bit might
542 		 * need to be set, recalculate it.
543 		 */
544 		sta_info_recalc_tim(sta);
545 
546 		return TX_QUEUED;
547 	} else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
548 		ps_dbg(tx->sdata,
549 		       "STA %pM in PS mode, but polling/in SP -> send frame\n",
550 		       sta->sta.addr);
551 	}
552 
553 	return TX_CONTINUE;
554 }
555 
556 static ieee80211_tx_result debug_noinline
557 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
558 {
559 	if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
560 		return TX_CONTINUE;
561 
562 	if (tx->flags & IEEE80211_TX_UNICAST)
563 		return ieee80211_tx_h_unicast_ps_buf(tx);
564 	else
565 		return ieee80211_tx_h_multicast_ps_buf(tx);
566 }
567 
568 static ieee80211_tx_result debug_noinline
569 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
570 {
571 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
572 
573 	if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
574 		if (tx->sdata->control_port_no_encrypt)
575 			info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
576 		info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
577 		info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
578 	}
579 
580 	return TX_CONTINUE;
581 }
582 
583 static ieee80211_tx_result debug_noinline
584 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
585 {
586 	struct ieee80211_key *key;
587 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
588 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
589 
590 	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
591 		tx->key = NULL;
592 	else if (tx->sta &&
593 		 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
594 		tx->key = key;
595 	else if (ieee80211_is_group_privacy_action(tx->skb) &&
596 		(key = rcu_dereference(tx->sdata->default_multicast_key)))
597 		tx->key = key;
598 	else if (ieee80211_is_mgmt(hdr->frame_control) &&
599 		 is_multicast_ether_addr(hdr->addr1) &&
600 		 ieee80211_is_robust_mgmt_frame(tx->skb) &&
601 		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
602 		tx->key = key;
603 	else if (is_multicast_ether_addr(hdr->addr1) &&
604 		 (key = rcu_dereference(tx->sdata->default_multicast_key)))
605 		tx->key = key;
606 	else if (!is_multicast_ether_addr(hdr->addr1) &&
607 		 (key = rcu_dereference(tx->sdata->default_unicast_key)))
608 		tx->key = key;
609 	else
610 		tx->key = NULL;
611 
612 	if (tx->key) {
613 		bool skip_hw = false;
614 
615 		/* TODO: add threshold stuff again */
616 
617 		switch (tx->key->conf.cipher) {
618 		case WLAN_CIPHER_SUITE_WEP40:
619 		case WLAN_CIPHER_SUITE_WEP104:
620 		case WLAN_CIPHER_SUITE_TKIP:
621 			if (!ieee80211_is_data_present(hdr->frame_control))
622 				tx->key = NULL;
623 			break;
624 		case WLAN_CIPHER_SUITE_CCMP:
625 		case WLAN_CIPHER_SUITE_CCMP_256:
626 		case WLAN_CIPHER_SUITE_GCMP:
627 		case WLAN_CIPHER_SUITE_GCMP_256:
628 			if (!ieee80211_is_data_present(hdr->frame_control) &&
629 			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
630 					       tx->skb) &&
631 			    !ieee80211_is_group_privacy_action(tx->skb))
632 				tx->key = NULL;
633 			else
634 				skip_hw = (tx->key->conf.flags &
635 					   IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
636 					ieee80211_is_mgmt(hdr->frame_control);
637 			break;
638 		case WLAN_CIPHER_SUITE_AES_CMAC:
639 		case WLAN_CIPHER_SUITE_BIP_CMAC_256:
640 		case WLAN_CIPHER_SUITE_BIP_GMAC_128:
641 		case WLAN_CIPHER_SUITE_BIP_GMAC_256:
642 			if (!ieee80211_is_mgmt(hdr->frame_control))
643 				tx->key = NULL;
644 			break;
645 		}
646 
647 		if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
648 			     !ieee80211_is_deauth(hdr->frame_control)))
649 			return TX_DROP;
650 
651 		if (!skip_hw && tx->key &&
652 		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
653 			info->control.hw_key = &tx->key->conf;
654 	}
655 
656 	return TX_CONTINUE;
657 }
658 
659 static ieee80211_tx_result debug_noinline
660 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
661 {
662 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
663 	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
664 	struct ieee80211_supported_band *sband;
665 	u32 len;
666 	struct ieee80211_tx_rate_control txrc;
667 	struct ieee80211_sta_rates *ratetbl = NULL;
668 	bool assoc = false;
669 
670 	memset(&txrc, 0, sizeof(txrc));
671 
672 	sband = tx->local->hw.wiphy->bands[info->band];
673 
674 	len = min_t(u32, tx->skb->len + FCS_LEN,
675 			 tx->local->hw.wiphy->frag_threshold);
676 
677 	/* set up the tx rate control struct we give the RC algo */
678 	txrc.hw = &tx->local->hw;
679 	txrc.sband = sband;
680 	txrc.bss_conf = &tx->sdata->vif.bss_conf;
681 	txrc.skb = tx->skb;
682 	txrc.reported_rate.idx = -1;
683 	txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
684 	if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
685 		txrc.max_rate_idx = -1;
686 	else
687 		txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
688 
689 	if (tx->sdata->rc_has_mcs_mask[info->band])
690 		txrc.rate_idx_mcs_mask =
691 			tx->sdata->rc_rateidx_mcs_mask[info->band];
692 
693 	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
694 		    tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
695 		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
696 		    tx->sdata->vif.type == NL80211_IFTYPE_OCB);
697 
698 	/* set up RTS protection if desired */
699 	if (len > tx->local->hw.wiphy->rts_threshold) {
700 		txrc.rts = true;
701 	}
702 
703 	info->control.use_rts = txrc.rts;
704 	info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
705 
706 	/*
707 	 * Use short preamble if the BSS can handle it, but not for
708 	 * management frames unless we know the receiver can handle
709 	 * that -- the management frame might be to a station that
710 	 * just wants a probe response.
711 	 */
712 	if (tx->sdata->vif.bss_conf.use_short_preamble &&
713 	    (ieee80211_is_data(hdr->frame_control) ||
714 	     (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
715 		txrc.short_preamble = true;
716 
717 	info->control.short_preamble = txrc.short_preamble;
718 
719 	/* don't ask rate control when rate already injected via radiotap */
720 	if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
721 		return TX_CONTINUE;
722 
723 	if (tx->sta)
724 		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
725 
726 	/*
727 	 * Lets not bother rate control if we're associated and cannot
728 	 * talk to the sta. This should not happen.
729 	 */
730 	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
731 		 !rate_usable_index_exists(sband, &tx->sta->sta),
732 		 "%s: Dropped data frame as no usable bitrate found while "
733 		 "scanning and associated. Target station: "
734 		 "%pM on %d GHz band\n",
735 		 tx->sdata->name, hdr->addr1,
736 		 info->band ? 5 : 2))
737 		return TX_DROP;
738 
739 	/*
740 	 * If we're associated with the sta at this point we know we can at
741 	 * least send the frame at the lowest bit rate.
742 	 */
743 	rate_control_get_rate(tx->sdata, tx->sta, &txrc);
744 
745 	if (tx->sta && !info->control.skip_table)
746 		ratetbl = rcu_dereference(tx->sta->sta.rates);
747 
748 	if (unlikely(info->control.rates[0].idx < 0)) {
749 		if (ratetbl) {
750 			struct ieee80211_tx_rate rate = {
751 				.idx = ratetbl->rate[0].idx,
752 				.flags = ratetbl->rate[0].flags,
753 				.count = ratetbl->rate[0].count
754 			};
755 
756 			if (ratetbl->rate[0].idx < 0)
757 				return TX_DROP;
758 
759 			tx->rate = rate;
760 		} else {
761 			return TX_DROP;
762 		}
763 	} else {
764 		tx->rate = info->control.rates[0];
765 	}
766 
767 	if (txrc.reported_rate.idx < 0) {
768 		txrc.reported_rate = tx->rate;
769 		if (tx->sta && ieee80211_is_data(hdr->frame_control))
770 			tx->sta->tx_stats.last_rate = txrc.reported_rate;
771 	} else if (tx->sta)
772 		tx->sta->tx_stats.last_rate = txrc.reported_rate;
773 
774 	if (ratetbl)
775 		return TX_CONTINUE;
776 
777 	if (unlikely(!info->control.rates[0].count))
778 		info->control.rates[0].count = 1;
779 
780 	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
781 			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
782 		info->control.rates[0].count = 1;
783 
784 	return TX_CONTINUE;
785 }
786 
787 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
788 {
789 	u16 *seq = &sta->tid_seq[tid];
790 	__le16 ret = cpu_to_le16(*seq);
791 
792 	/* Increase the sequence number. */
793 	*seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
794 
795 	return ret;
796 }
797 
798 static ieee80211_tx_result debug_noinline
799 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
800 {
801 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
802 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
803 	u8 *qc;
804 	int tid;
805 
806 	/*
807 	 * Packet injection may want to control the sequence
808 	 * number, if we have no matching interface then we
809 	 * neither assign one ourselves nor ask the driver to.
810 	 */
811 	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
812 		return TX_CONTINUE;
813 
814 	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
815 		return TX_CONTINUE;
816 
817 	if (ieee80211_hdrlen(hdr->frame_control) < 24)
818 		return TX_CONTINUE;
819 
820 	if (ieee80211_is_qos_nullfunc(hdr->frame_control))
821 		return TX_CONTINUE;
822 
823 	/*
824 	 * Anything but QoS data that has a sequence number field
825 	 * (is long enough) gets a sequence number from the global
826 	 * counter.  QoS data frames with a multicast destination
827 	 * also use the global counter (802.11-2012 9.3.2.10).
828 	 */
829 	if (!ieee80211_is_data_qos(hdr->frame_control) ||
830 	    is_multicast_ether_addr(hdr->addr1)) {
831 		/* driver should assign sequence number */
832 		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
833 		/* for pure STA mode without beacons, we can do it */
834 		hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
835 		tx->sdata->sequence_number += 0x10;
836 		if (tx->sta)
837 			tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
838 		return TX_CONTINUE;
839 	}
840 
841 	/*
842 	 * This should be true for injected/management frames only, for
843 	 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
844 	 * above since they are not QoS-data frames.
845 	 */
846 	if (!tx->sta)
847 		return TX_CONTINUE;
848 
849 	/* include per-STA, per-TID sequence counter */
850 
851 	qc = ieee80211_get_qos_ctl(hdr);
852 	tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
853 	tx->sta->tx_stats.msdu[tid]++;
854 
855 	hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
856 
857 	return TX_CONTINUE;
858 }
859 
860 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
861 			      struct sk_buff *skb, int hdrlen,
862 			      int frag_threshold)
863 {
864 	struct ieee80211_local *local = tx->local;
865 	struct ieee80211_tx_info *info;
866 	struct sk_buff *tmp;
867 	int per_fragm = frag_threshold - hdrlen - FCS_LEN;
868 	int pos = hdrlen + per_fragm;
869 	int rem = skb->len - hdrlen - per_fragm;
870 
871 	if (WARN_ON(rem < 0))
872 		return -EINVAL;
873 
874 	/* first fragment was already added to queue by caller */
875 
876 	while (rem) {
877 		int fraglen = per_fragm;
878 
879 		if (fraglen > rem)
880 			fraglen = rem;
881 		rem -= fraglen;
882 		tmp = dev_alloc_skb(local->tx_headroom +
883 				    frag_threshold +
884 				    tx->sdata->encrypt_headroom +
885 				    IEEE80211_ENCRYPT_TAILROOM);
886 		if (!tmp)
887 			return -ENOMEM;
888 
889 		__skb_queue_tail(&tx->skbs, tmp);
890 
891 		skb_reserve(tmp,
892 			    local->tx_headroom + tx->sdata->encrypt_headroom);
893 
894 		/* copy control information */
895 		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
896 
897 		info = IEEE80211_SKB_CB(tmp);
898 		info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
899 				 IEEE80211_TX_CTL_FIRST_FRAGMENT);
900 
901 		if (rem)
902 			info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
903 
904 		skb_copy_queue_mapping(tmp, skb);
905 		tmp->priority = skb->priority;
906 		tmp->dev = skb->dev;
907 
908 		/* copy header and data */
909 		memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
910 		memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
911 
912 		pos += fraglen;
913 	}
914 
915 	/* adjust first fragment's length */
916 	skb_trim(skb, hdrlen + per_fragm);
917 	return 0;
918 }
919 
920 static ieee80211_tx_result debug_noinline
921 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
922 {
923 	struct sk_buff *skb = tx->skb;
924 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
925 	struct ieee80211_hdr *hdr = (void *)skb->data;
926 	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
927 	int hdrlen;
928 	int fragnum;
929 
930 	/* no matter what happens, tx->skb moves to tx->skbs */
931 	__skb_queue_tail(&tx->skbs, skb);
932 	tx->skb = NULL;
933 
934 	if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
935 		return TX_CONTINUE;
936 
937 	if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
938 		return TX_CONTINUE;
939 
940 	/*
941 	 * Warn when submitting a fragmented A-MPDU frame and drop it.
942 	 * This scenario is handled in ieee80211_tx_prepare but extra
943 	 * caution taken here as fragmented ampdu may cause Tx stop.
944 	 */
945 	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
946 		return TX_DROP;
947 
948 	hdrlen = ieee80211_hdrlen(hdr->frame_control);
949 
950 	/* internal error, why isn't DONTFRAG set? */
951 	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
952 		return TX_DROP;
953 
954 	/*
955 	 * Now fragment the frame. This will allocate all the fragments and
956 	 * chain them (using skb as the first fragment) to skb->next.
957 	 * During transmission, we will remove the successfully transmitted
958 	 * fragments from this list. When the low-level driver rejects one
959 	 * of the fragments then we will simply pretend to accept the skb
960 	 * but store it away as pending.
961 	 */
962 	if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
963 		return TX_DROP;
964 
965 	/* update duration/seq/flags of fragments */
966 	fragnum = 0;
967 
968 	skb_queue_walk(&tx->skbs, skb) {
969 		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
970 
971 		hdr = (void *)skb->data;
972 		info = IEEE80211_SKB_CB(skb);
973 
974 		if (!skb_queue_is_last(&tx->skbs, skb)) {
975 			hdr->frame_control |= morefrags;
976 			/*
977 			 * No multi-rate retries for fragmented frames, that
978 			 * would completely throw off the NAV at other STAs.
979 			 */
980 			info->control.rates[1].idx = -1;
981 			info->control.rates[2].idx = -1;
982 			info->control.rates[3].idx = -1;
983 			BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
984 			info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
985 		} else {
986 			hdr->frame_control &= ~morefrags;
987 		}
988 		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
989 		fragnum++;
990 	}
991 
992 	return TX_CONTINUE;
993 }
994 
995 static ieee80211_tx_result debug_noinline
996 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
997 {
998 	struct sk_buff *skb;
999 	int ac = -1;
1000 
1001 	if (!tx->sta)
1002 		return TX_CONTINUE;
1003 
1004 	skb_queue_walk(&tx->skbs, skb) {
1005 		ac = skb_get_queue_mapping(skb);
1006 		tx->sta->tx_stats.bytes[ac] += skb->len;
1007 	}
1008 	if (ac >= 0)
1009 		tx->sta->tx_stats.packets[ac]++;
1010 
1011 	return TX_CONTINUE;
1012 }
1013 
1014 static ieee80211_tx_result debug_noinline
1015 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1016 {
1017 	if (!tx->key)
1018 		return TX_CONTINUE;
1019 
1020 	switch (tx->key->conf.cipher) {
1021 	case WLAN_CIPHER_SUITE_WEP40:
1022 	case WLAN_CIPHER_SUITE_WEP104:
1023 		return ieee80211_crypto_wep_encrypt(tx);
1024 	case WLAN_CIPHER_SUITE_TKIP:
1025 		return ieee80211_crypto_tkip_encrypt(tx);
1026 	case WLAN_CIPHER_SUITE_CCMP:
1027 		return ieee80211_crypto_ccmp_encrypt(
1028 			tx, IEEE80211_CCMP_MIC_LEN);
1029 	case WLAN_CIPHER_SUITE_CCMP_256:
1030 		return ieee80211_crypto_ccmp_encrypt(
1031 			tx, IEEE80211_CCMP_256_MIC_LEN);
1032 	case WLAN_CIPHER_SUITE_AES_CMAC:
1033 		return ieee80211_crypto_aes_cmac_encrypt(tx);
1034 	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1035 		return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1036 	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1037 	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1038 		return ieee80211_crypto_aes_gmac_encrypt(tx);
1039 	case WLAN_CIPHER_SUITE_GCMP:
1040 	case WLAN_CIPHER_SUITE_GCMP_256:
1041 		return ieee80211_crypto_gcmp_encrypt(tx);
1042 	default:
1043 		return ieee80211_crypto_hw_encrypt(tx);
1044 	}
1045 
1046 	return TX_DROP;
1047 }
1048 
1049 static ieee80211_tx_result debug_noinline
1050 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1051 {
1052 	struct sk_buff *skb;
1053 	struct ieee80211_hdr *hdr;
1054 	int next_len;
1055 	bool group_addr;
1056 
1057 	skb_queue_walk(&tx->skbs, skb) {
1058 		hdr = (void *) skb->data;
1059 		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1060 			break; /* must not overwrite AID */
1061 		if (!skb_queue_is_last(&tx->skbs, skb)) {
1062 			struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1063 			next_len = next->len;
1064 		} else
1065 			next_len = 0;
1066 		group_addr = is_multicast_ether_addr(hdr->addr1);
1067 
1068 		hdr->duration_id =
1069 			ieee80211_duration(tx, skb, group_addr, next_len);
1070 	}
1071 
1072 	return TX_CONTINUE;
1073 }
1074 
1075 /* actual transmit path */
1076 
1077 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1078 				  struct sk_buff *skb,
1079 				  struct ieee80211_tx_info *info,
1080 				  struct tid_ampdu_tx *tid_tx,
1081 				  int tid)
1082 {
1083 	bool queued = false;
1084 	bool reset_agg_timer = false;
1085 	struct sk_buff *purge_skb = NULL;
1086 
1087 	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1088 		info->flags |= IEEE80211_TX_CTL_AMPDU;
1089 		reset_agg_timer = true;
1090 	} else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1091 		/*
1092 		 * nothing -- this aggregation session is being started
1093 		 * but that might still fail with the driver
1094 		 */
1095 	} else if (!tx->sta->sta.txq[tid]) {
1096 		spin_lock(&tx->sta->lock);
1097 		/*
1098 		 * Need to re-check now, because we may get here
1099 		 *
1100 		 *  1) in the window during which the setup is actually
1101 		 *     already done, but not marked yet because not all
1102 		 *     packets are spliced over to the driver pending
1103 		 *     queue yet -- if this happened we acquire the lock
1104 		 *     either before or after the splice happens, but
1105 		 *     need to recheck which of these cases happened.
1106 		 *
1107 		 *  2) during session teardown, if the OPERATIONAL bit
1108 		 *     was cleared due to the teardown but the pointer
1109 		 *     hasn't been assigned NULL yet (or we loaded it
1110 		 *     before it was assigned) -- in this case it may
1111 		 *     now be NULL which means we should just let the
1112 		 *     packet pass through because splicing the frames
1113 		 *     back is already done.
1114 		 */
1115 		tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1116 
1117 		if (!tid_tx) {
1118 			/* do nothing, let packet pass through */
1119 		} else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1120 			info->flags |= IEEE80211_TX_CTL_AMPDU;
1121 			reset_agg_timer = true;
1122 		} else {
1123 			queued = true;
1124 			if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1125 				clear_sta_flag(tx->sta, WLAN_STA_SP);
1126 				ps_dbg(tx->sta->sdata,
1127 				       "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1128 				       tx->sta->sta.addr, tx->sta->sta.aid);
1129 			}
1130 			info->control.vif = &tx->sdata->vif;
1131 			info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1132 			info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1133 			__skb_queue_tail(&tid_tx->pending, skb);
1134 			if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1135 				purge_skb = __skb_dequeue(&tid_tx->pending);
1136 		}
1137 		spin_unlock(&tx->sta->lock);
1138 
1139 		if (purge_skb)
1140 			ieee80211_free_txskb(&tx->local->hw, purge_skb);
1141 	}
1142 
1143 	/* reset session timer */
1144 	if (reset_agg_timer && tid_tx->timeout)
1145 		tid_tx->last_tx = jiffies;
1146 
1147 	return queued;
1148 }
1149 
1150 /*
1151  * initialises @tx
1152  * pass %NULL for the station if unknown, a valid pointer if known
1153  * or an ERR_PTR() if the station is known not to exist
1154  */
1155 static ieee80211_tx_result
1156 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1157 		     struct ieee80211_tx_data *tx,
1158 		     struct sta_info *sta, struct sk_buff *skb)
1159 {
1160 	struct ieee80211_local *local = sdata->local;
1161 	struct ieee80211_hdr *hdr;
1162 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1163 	int tid;
1164 	u8 *qc;
1165 
1166 	memset(tx, 0, sizeof(*tx));
1167 	tx->skb = skb;
1168 	tx->local = local;
1169 	tx->sdata = sdata;
1170 	__skb_queue_head_init(&tx->skbs);
1171 
1172 	/*
1173 	 * If this flag is set to true anywhere, and we get here,
1174 	 * we are doing the needed processing, so remove the flag
1175 	 * now.
1176 	 */
1177 	info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1178 
1179 	hdr = (struct ieee80211_hdr *) skb->data;
1180 
1181 	if (likely(sta)) {
1182 		if (!IS_ERR(sta))
1183 			tx->sta = sta;
1184 	} else {
1185 		if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1186 			tx->sta = rcu_dereference(sdata->u.vlan.sta);
1187 			if (!tx->sta && sdata->wdev.use_4addr)
1188 				return TX_DROP;
1189 		} else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1190 					  IEEE80211_TX_CTL_INJECTED) ||
1191 			   tx->sdata->control_port_protocol == tx->skb->protocol) {
1192 			tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1193 		}
1194 		if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1195 			tx->sta = sta_info_get(sdata, hdr->addr1);
1196 	}
1197 
1198 	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1199 	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1200 	    ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1201 	    !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1202 		struct tid_ampdu_tx *tid_tx;
1203 
1204 		qc = ieee80211_get_qos_ctl(hdr);
1205 		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1206 
1207 		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1208 		if (tid_tx) {
1209 			bool queued;
1210 
1211 			queued = ieee80211_tx_prep_agg(tx, skb, info,
1212 						       tid_tx, tid);
1213 
1214 			if (unlikely(queued))
1215 				return TX_QUEUED;
1216 		}
1217 	}
1218 
1219 	if (is_multicast_ether_addr(hdr->addr1)) {
1220 		tx->flags &= ~IEEE80211_TX_UNICAST;
1221 		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1222 	} else
1223 		tx->flags |= IEEE80211_TX_UNICAST;
1224 
1225 	if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1226 		if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1227 		    skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1228 		    info->flags & IEEE80211_TX_CTL_AMPDU)
1229 			info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1230 	}
1231 
1232 	if (!tx->sta)
1233 		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1234 	else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1235 		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1236 		ieee80211_check_fast_xmit(tx->sta);
1237 	}
1238 
1239 	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1240 
1241 	return TX_CONTINUE;
1242 }
1243 
1244 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1245 					  struct ieee80211_vif *vif,
1246 					  struct ieee80211_sta *pubsta,
1247 					  struct sk_buff *skb)
1248 {
1249 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1250 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1251 	struct ieee80211_txq *txq = NULL;
1252 
1253 	if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1254 	    (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1255 		return NULL;
1256 
1257 	if (!ieee80211_is_data(hdr->frame_control))
1258 		return NULL;
1259 
1260 	if (pubsta) {
1261 		u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1262 
1263 		txq = pubsta->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 	cparams = &local->cparams;
1344 	cstats = &txqi->cstats;
1345 
1346 	if (flow == &txqi->def_flow)
1347 		cvars = &txqi->def_cvars;
1348 	else
1349 		cvars = &local->cvars[flow - fq->flows];
1350 
1351 	return codel_dequeue(txqi,
1352 			     &flow->backlog,
1353 			     cparams,
1354 			     cvars,
1355 			     cstats,
1356 			     codel_skb_len_func,
1357 			     codel_skb_time_func,
1358 			     codel_drop_func,
1359 			     codel_dequeue_func);
1360 }
1361 
1362 static void fq_skb_free_func(struct fq *fq,
1363 			     struct fq_tin *tin,
1364 			     struct fq_flow *flow,
1365 			     struct sk_buff *skb)
1366 {
1367 	struct ieee80211_local *local;
1368 
1369 	local = container_of(fq, struct ieee80211_local, fq);
1370 	ieee80211_free_txskb(&local->hw, skb);
1371 }
1372 
1373 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1374 						struct fq_tin *tin,
1375 						int idx,
1376 						struct sk_buff *skb)
1377 {
1378 	struct txq_info *txqi;
1379 
1380 	txqi = container_of(tin, struct txq_info, tin);
1381 	return &txqi->def_flow;
1382 }
1383 
1384 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1385 				  struct txq_info *txqi,
1386 				  struct sk_buff *skb)
1387 {
1388 	struct fq *fq = &local->fq;
1389 	struct fq_tin *tin = &txqi->tin;
1390 
1391 	ieee80211_set_skb_enqueue_time(skb);
1392 	fq_tin_enqueue(fq, tin, skb,
1393 		       fq_skb_free_func,
1394 		       fq_flow_get_default_func);
1395 }
1396 
1397 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1398 			struct sta_info *sta,
1399 			struct txq_info *txqi, int tid)
1400 {
1401 	fq_tin_init(&txqi->tin);
1402 	fq_flow_init(&txqi->def_flow);
1403 	codel_vars_init(&txqi->def_cvars);
1404 	codel_stats_init(&txqi->cstats);
1405 	__skb_queue_head_init(&txqi->frags);
1406 
1407 	txqi->txq.vif = &sdata->vif;
1408 
1409 	if (sta) {
1410 		txqi->txq.sta = &sta->sta;
1411 		sta->sta.txq[tid] = &txqi->txq;
1412 		txqi->txq.tid = tid;
1413 		txqi->txq.ac = ieee802_1d_to_ac[tid & 7];
1414 	} else {
1415 		sdata->vif.txq = &txqi->txq;
1416 		txqi->txq.tid = 0;
1417 		txqi->txq.ac = IEEE80211_AC_BE;
1418 	}
1419 }
1420 
1421 void ieee80211_txq_purge(struct ieee80211_local *local,
1422 			 struct txq_info *txqi)
1423 {
1424 	struct fq *fq = &local->fq;
1425 	struct fq_tin *tin = &txqi->tin;
1426 
1427 	fq_tin_reset(fq, tin, fq_skb_free_func);
1428 	ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1429 }
1430 
1431 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1432 {
1433 	struct fq *fq = &local->fq;
1434 	int ret;
1435 	int i;
1436 	bool supp_vht = false;
1437 	enum nl80211_band band;
1438 
1439 	if (!local->ops->wake_tx_queue)
1440 		return 0;
1441 
1442 	ret = fq_init(fq, 4096);
1443 	if (ret)
1444 		return ret;
1445 
1446 	/*
1447 	 * If the hardware doesn't support VHT, it is safe to limit the maximum
1448 	 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1449 	 */
1450 	for (band = 0; band < NUM_NL80211_BANDS; band++) {
1451 		struct ieee80211_supported_band *sband;
1452 
1453 		sband = local->hw.wiphy->bands[band];
1454 		if (!sband)
1455 			continue;
1456 
1457 		supp_vht = supp_vht || sband->vht_cap.vht_supported;
1458 	}
1459 
1460 	if (!supp_vht)
1461 		fq->memory_limit = 4 << 20; /* 4 Mbytes */
1462 
1463 	codel_params_init(&local->cparams);
1464 	local->cparams.interval = MS2TIME(100);
1465 	local->cparams.target = MS2TIME(20);
1466 	local->cparams.ecn = true;
1467 
1468 	local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1469 			       GFP_KERNEL);
1470 	if (!local->cvars) {
1471 		spin_lock_bh(&fq->lock);
1472 		fq_reset(fq, fq_skb_free_func);
1473 		spin_unlock_bh(&fq->lock);
1474 		return -ENOMEM;
1475 	}
1476 
1477 	for (i = 0; i < fq->flows_cnt; i++)
1478 		codel_vars_init(&local->cvars[i]);
1479 
1480 	return 0;
1481 }
1482 
1483 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1484 {
1485 	struct fq *fq = &local->fq;
1486 
1487 	if (!local->ops->wake_tx_queue)
1488 		return;
1489 
1490 	kfree(local->cvars);
1491 	local->cvars = NULL;
1492 
1493 	spin_lock_bh(&fq->lock);
1494 	fq_reset(fq, fq_skb_free_func);
1495 	spin_unlock_bh(&fq->lock);
1496 }
1497 
1498 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1499 				struct ieee80211_sub_if_data *sdata,
1500 				struct sta_info *sta,
1501 				struct sk_buff *skb)
1502 {
1503 	struct fq *fq = &local->fq;
1504 	struct ieee80211_vif *vif;
1505 	struct txq_info *txqi;
1506 	struct ieee80211_sta *pubsta;
1507 
1508 	if (!local->ops->wake_tx_queue ||
1509 	    sdata->vif.type == NL80211_IFTYPE_MONITOR)
1510 		return false;
1511 
1512 	if (sta && sta->uploaded)
1513 		pubsta = &sta->sta;
1514 	else
1515 		pubsta = NULL;
1516 
1517 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1518 		sdata = container_of(sdata->bss,
1519 				     struct ieee80211_sub_if_data, u.ap);
1520 
1521 	vif = &sdata->vif;
1522 	txqi = ieee80211_get_txq(local, vif, pubsta, skb);
1523 
1524 	if (!txqi)
1525 		return false;
1526 
1527 	spin_lock_bh(&fq->lock);
1528 	ieee80211_txq_enqueue(local, txqi, skb);
1529 	spin_unlock_bh(&fq->lock);
1530 
1531 	drv_wake_tx_queue(local, txqi);
1532 
1533 	return true;
1534 }
1535 
1536 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1537 			       struct ieee80211_vif *vif,
1538 			       struct ieee80211_sta *sta,
1539 			       struct sk_buff_head *skbs,
1540 			       bool txpending)
1541 {
1542 	struct ieee80211_tx_control control = {};
1543 	struct sk_buff *skb, *tmp;
1544 	unsigned long flags;
1545 
1546 	skb_queue_walk_safe(skbs, skb, tmp) {
1547 		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1548 		int q = info->hw_queue;
1549 
1550 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1551 		if (WARN_ON_ONCE(q >= local->hw.queues)) {
1552 			__skb_unlink(skb, skbs);
1553 			ieee80211_free_txskb(&local->hw, skb);
1554 			continue;
1555 		}
1556 #endif
1557 
1558 		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1559 		if (local->queue_stop_reasons[q] ||
1560 		    (!txpending && !skb_queue_empty(&local->pending[q]))) {
1561 			if (unlikely(info->flags &
1562 				     IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1563 				if (local->queue_stop_reasons[q] &
1564 				    ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1565 					/*
1566 					 * Drop off-channel frames if queues
1567 					 * are stopped for any reason other
1568 					 * than off-channel operation. Never
1569 					 * queue them.
1570 					 */
1571 					spin_unlock_irqrestore(
1572 						&local->queue_stop_reason_lock,
1573 						flags);
1574 					ieee80211_purge_tx_queue(&local->hw,
1575 								 skbs);
1576 					return true;
1577 				}
1578 			} else {
1579 
1580 				/*
1581 				 * Since queue is stopped, queue up frames for
1582 				 * later transmission from the tx-pending
1583 				 * tasklet when the queue is woken again.
1584 				 */
1585 				if (txpending)
1586 					skb_queue_splice_init(skbs,
1587 							      &local->pending[q]);
1588 				else
1589 					skb_queue_splice_tail_init(skbs,
1590 								   &local->pending[q]);
1591 
1592 				spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1593 						       flags);
1594 				return false;
1595 			}
1596 		}
1597 		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1598 
1599 		info->control.vif = vif;
1600 		control.sta = sta;
1601 
1602 		__skb_unlink(skb, skbs);
1603 		drv_tx(local, &control, skb);
1604 	}
1605 
1606 	return true;
1607 }
1608 
1609 /*
1610  * Returns false if the frame couldn't be transmitted but was queued instead.
1611  */
1612 static bool __ieee80211_tx(struct ieee80211_local *local,
1613 			   struct sk_buff_head *skbs, int led_len,
1614 			   struct sta_info *sta, bool txpending)
1615 {
1616 	struct ieee80211_tx_info *info;
1617 	struct ieee80211_sub_if_data *sdata;
1618 	struct ieee80211_vif *vif;
1619 	struct ieee80211_sta *pubsta;
1620 	struct sk_buff *skb;
1621 	bool result = true;
1622 	__le16 fc;
1623 
1624 	if (WARN_ON(skb_queue_empty(skbs)))
1625 		return true;
1626 
1627 	skb = skb_peek(skbs);
1628 	fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1629 	info = IEEE80211_SKB_CB(skb);
1630 	sdata = vif_to_sdata(info->control.vif);
1631 	if (sta && !sta->uploaded)
1632 		sta = NULL;
1633 
1634 	if (sta)
1635 		pubsta = &sta->sta;
1636 	else
1637 		pubsta = NULL;
1638 
1639 	switch (sdata->vif.type) {
1640 	case NL80211_IFTYPE_MONITOR:
1641 		if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1642 			vif = &sdata->vif;
1643 			break;
1644 		}
1645 		sdata = rcu_dereference(local->monitor_sdata);
1646 		if (sdata) {
1647 			vif = &sdata->vif;
1648 			info->hw_queue =
1649 				vif->hw_queue[skb_get_queue_mapping(skb)];
1650 		} else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1651 			ieee80211_purge_tx_queue(&local->hw, skbs);
1652 			return true;
1653 		} else
1654 			vif = NULL;
1655 		break;
1656 	case NL80211_IFTYPE_AP_VLAN:
1657 		sdata = container_of(sdata->bss,
1658 				     struct ieee80211_sub_if_data, u.ap);
1659 		/* fall through */
1660 	default:
1661 		vif = &sdata->vif;
1662 		break;
1663 	}
1664 
1665 	result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1666 				    txpending);
1667 
1668 	ieee80211_tpt_led_trig_tx(local, fc, led_len);
1669 
1670 	WARN_ON_ONCE(!skb_queue_empty(skbs));
1671 
1672 	return result;
1673 }
1674 
1675 /*
1676  * Invoke TX handlers, return 0 on success and non-zero if the
1677  * frame was dropped or queued.
1678  *
1679  * The handlers are split into an early and late part. The latter is everything
1680  * that can be sensitive to reordering, and will be deferred to after packets
1681  * are dequeued from the intermediate queues (when they are enabled).
1682  */
1683 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1684 {
1685 	ieee80211_tx_result res = TX_DROP;
1686 
1687 #define CALL_TXH(txh) \
1688 	do {				\
1689 		res = txh(tx);		\
1690 		if (res != TX_CONTINUE)	\
1691 			goto txh_done;	\
1692 	} while (0)
1693 
1694 	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1695 	CALL_TXH(ieee80211_tx_h_check_assoc);
1696 	CALL_TXH(ieee80211_tx_h_ps_buf);
1697 	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1698 	CALL_TXH(ieee80211_tx_h_select_key);
1699 	if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1700 		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1701 
1702  txh_done:
1703 	if (unlikely(res == TX_DROP)) {
1704 		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1705 		if (tx->skb)
1706 			ieee80211_free_txskb(&tx->local->hw, tx->skb);
1707 		else
1708 			ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1709 		return -1;
1710 	} else if (unlikely(res == TX_QUEUED)) {
1711 		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1712 		return -1;
1713 	}
1714 
1715 	return 0;
1716 }
1717 
1718 /*
1719  * Late handlers can be called while the sta lock is held. Handlers that can
1720  * cause packets to be generated will cause deadlock!
1721  */
1722 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1723 {
1724 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1725 	ieee80211_tx_result res = TX_CONTINUE;
1726 
1727 	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1728 		__skb_queue_tail(&tx->skbs, tx->skb);
1729 		tx->skb = NULL;
1730 		goto txh_done;
1731 	}
1732 
1733 	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1734 	CALL_TXH(ieee80211_tx_h_sequence);
1735 	CALL_TXH(ieee80211_tx_h_fragment);
1736 	/* handlers after fragment must be aware of tx info fragmentation! */
1737 	CALL_TXH(ieee80211_tx_h_stats);
1738 	CALL_TXH(ieee80211_tx_h_encrypt);
1739 	if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1740 		CALL_TXH(ieee80211_tx_h_calculate_duration);
1741 #undef CALL_TXH
1742 
1743  txh_done:
1744 	if (unlikely(res == TX_DROP)) {
1745 		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1746 		if (tx->skb)
1747 			ieee80211_free_txskb(&tx->local->hw, tx->skb);
1748 		else
1749 			ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1750 		return -1;
1751 	} else if (unlikely(res == TX_QUEUED)) {
1752 		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1753 		return -1;
1754 	}
1755 
1756 	return 0;
1757 }
1758 
1759 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1760 {
1761 	int r = invoke_tx_handlers_early(tx);
1762 
1763 	if (r)
1764 		return r;
1765 	return invoke_tx_handlers_late(tx);
1766 }
1767 
1768 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1769 			      struct ieee80211_vif *vif, struct sk_buff *skb,
1770 			      int band, struct ieee80211_sta **sta)
1771 {
1772 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1773 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1774 	struct ieee80211_tx_data tx;
1775 	struct sk_buff *skb2;
1776 
1777 	if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1778 		return false;
1779 
1780 	info->band = band;
1781 	info->control.vif = vif;
1782 	info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1783 
1784 	if (invoke_tx_handlers(&tx))
1785 		return false;
1786 
1787 	if (sta) {
1788 		if (tx.sta)
1789 			*sta = &tx.sta->sta;
1790 		else
1791 			*sta = NULL;
1792 	}
1793 
1794 	/* this function isn't suitable for fragmented data frames */
1795 	skb2 = __skb_dequeue(&tx.skbs);
1796 	if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1797 		ieee80211_free_txskb(hw, skb2);
1798 		ieee80211_purge_tx_queue(hw, &tx.skbs);
1799 		return false;
1800 	}
1801 
1802 	return true;
1803 }
1804 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1805 
1806 /*
1807  * Returns false if the frame couldn't be transmitted but was queued instead.
1808  */
1809 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1810 			 struct sta_info *sta, struct sk_buff *skb,
1811 			 bool txpending)
1812 {
1813 	struct ieee80211_local *local = sdata->local;
1814 	struct ieee80211_tx_data tx;
1815 	ieee80211_tx_result res_prepare;
1816 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1817 	bool result = true;
1818 	int led_len;
1819 
1820 	if (unlikely(skb->len < 10)) {
1821 		dev_kfree_skb(skb);
1822 		return true;
1823 	}
1824 
1825 	/* initialises tx */
1826 	led_len = skb->len;
1827 	res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1828 
1829 	if (unlikely(res_prepare == TX_DROP)) {
1830 		ieee80211_free_txskb(&local->hw, skb);
1831 		return true;
1832 	} else if (unlikely(res_prepare == TX_QUEUED)) {
1833 		return true;
1834 	}
1835 
1836 	/* set up hw_queue value early */
1837 	if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1838 	    !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1839 		info->hw_queue =
1840 			sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1841 
1842 	if (invoke_tx_handlers_early(&tx))
1843 		return false;
1844 
1845 	if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1846 		return true;
1847 
1848 	if (!invoke_tx_handlers_late(&tx))
1849 		result = __ieee80211_tx(local, &tx.skbs, led_len,
1850 					tx.sta, txpending);
1851 
1852 	return result;
1853 }
1854 
1855 /* device xmit handlers */
1856 
1857 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1858 				struct sk_buff *skb,
1859 				int head_need, bool may_encrypt)
1860 {
1861 	struct ieee80211_local *local = sdata->local;
1862 	int tail_need = 0;
1863 
1864 	if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1865 		tail_need = IEEE80211_ENCRYPT_TAILROOM;
1866 		tail_need -= skb_tailroom(skb);
1867 		tail_need = max_t(int, tail_need, 0);
1868 	}
1869 
1870 	if (skb_cloned(skb) &&
1871 	    (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1872 	     !skb_clone_writable(skb, ETH_HLEN) ||
1873 	     (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1874 		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1875 	else if (head_need || tail_need)
1876 		I802_DEBUG_INC(local->tx_expand_skb_head);
1877 	else
1878 		return 0;
1879 
1880 	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1881 		wiphy_debug(local->hw.wiphy,
1882 			    "failed to reallocate TX buffer\n");
1883 		return -ENOMEM;
1884 	}
1885 
1886 	return 0;
1887 }
1888 
1889 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1890 		    struct sta_info *sta, struct sk_buff *skb)
1891 {
1892 	struct ieee80211_local *local = sdata->local;
1893 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1894 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1895 	int headroom;
1896 	bool may_encrypt;
1897 
1898 	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1899 
1900 	headroom = local->tx_headroom;
1901 	if (may_encrypt)
1902 		headroom += sdata->encrypt_headroom;
1903 	headroom -= skb_headroom(skb);
1904 	headroom = max_t(int, 0, headroom);
1905 
1906 	if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1907 		ieee80211_free_txskb(&local->hw, skb);
1908 		return;
1909 	}
1910 
1911 	hdr = (struct ieee80211_hdr *) skb->data;
1912 	info->control.vif = &sdata->vif;
1913 
1914 	if (ieee80211_vif_is_mesh(&sdata->vif)) {
1915 		if (ieee80211_is_data(hdr->frame_control) &&
1916 		    is_unicast_ether_addr(hdr->addr1)) {
1917 			if (mesh_nexthop_resolve(sdata, skb))
1918 				return; /* skb queued: don't free */
1919 		} else {
1920 			ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1921 		}
1922 	}
1923 
1924 	ieee80211_set_qos_hdr(sdata, skb);
1925 	ieee80211_tx(sdata, sta, skb, false);
1926 }
1927 
1928 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1929 					struct sk_buff *skb)
1930 {
1931 	struct ieee80211_radiotap_iterator iterator;
1932 	struct ieee80211_radiotap_header *rthdr =
1933 		(struct ieee80211_radiotap_header *) skb->data;
1934 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1935 	struct ieee80211_supported_band *sband =
1936 		local->hw.wiphy->bands[info->band];
1937 	int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1938 						   NULL);
1939 	u16 txflags;
1940 	u16 rate = 0;
1941 	bool rate_found = false;
1942 	u8 rate_retries = 0;
1943 	u16 rate_flags = 0;
1944 	u8 mcs_known, mcs_flags, mcs_bw;
1945 	u16 vht_known;
1946 	u8 vht_mcs = 0, vht_nss = 0;
1947 	int i;
1948 
1949 	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1950 		       IEEE80211_TX_CTL_DONTFRAG;
1951 
1952 	/*
1953 	 * for every radiotap entry that is present
1954 	 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1955 	 * entries present, or -EINVAL on error)
1956 	 */
1957 
1958 	while (!ret) {
1959 		ret = ieee80211_radiotap_iterator_next(&iterator);
1960 
1961 		if (ret)
1962 			continue;
1963 
1964 		/* see if this argument is something we can use */
1965 		switch (iterator.this_arg_index) {
1966 		/*
1967 		 * You must take care when dereferencing iterator.this_arg
1968 		 * for multibyte types... the pointer is not aligned.  Use
1969 		 * get_unaligned((type *)iterator.this_arg) to dereference
1970 		 * iterator.this_arg for type "type" safely on all arches.
1971 		*/
1972 		case IEEE80211_RADIOTAP_FLAGS:
1973 			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1974 				/*
1975 				 * this indicates that the skb we have been
1976 				 * handed has the 32-bit FCS CRC at the end...
1977 				 * we should react to that by snipping it off
1978 				 * because it will be recomputed and added
1979 				 * on transmission
1980 				 */
1981 				if (skb->len < (iterator._max_length + FCS_LEN))
1982 					return false;
1983 
1984 				skb_trim(skb, skb->len - FCS_LEN);
1985 			}
1986 			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1987 				info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1988 			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1989 				info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1990 			break;
1991 
1992 		case IEEE80211_RADIOTAP_TX_FLAGS:
1993 			txflags = get_unaligned_le16(iterator.this_arg);
1994 			if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1995 				info->flags |= IEEE80211_TX_CTL_NO_ACK;
1996 			break;
1997 
1998 		case IEEE80211_RADIOTAP_RATE:
1999 			rate = *iterator.this_arg;
2000 			rate_flags = 0;
2001 			rate_found = true;
2002 			break;
2003 
2004 		case IEEE80211_RADIOTAP_DATA_RETRIES:
2005 			rate_retries = *iterator.this_arg;
2006 			break;
2007 
2008 		case IEEE80211_RADIOTAP_MCS:
2009 			mcs_known = iterator.this_arg[0];
2010 			mcs_flags = iterator.this_arg[1];
2011 			if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2012 				break;
2013 
2014 			rate_found = true;
2015 			rate = iterator.this_arg[2];
2016 			rate_flags = IEEE80211_TX_RC_MCS;
2017 
2018 			if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2019 			    mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2020 				rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2021 
2022 			mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2023 			if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2024 			    mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2025 				rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2026 			break;
2027 
2028 		case IEEE80211_RADIOTAP_VHT:
2029 			vht_known = get_unaligned_le16(iterator.this_arg);
2030 			rate_found = true;
2031 
2032 			rate_flags = IEEE80211_TX_RC_VHT_MCS;
2033 			if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2034 			    (iterator.this_arg[2] &
2035 			     IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2036 				rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2037 			if (vht_known &
2038 			    IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2039 				if (iterator.this_arg[3] == 1)
2040 					rate_flags |=
2041 						IEEE80211_TX_RC_40_MHZ_WIDTH;
2042 				else if (iterator.this_arg[3] == 4)
2043 					rate_flags |=
2044 						IEEE80211_TX_RC_80_MHZ_WIDTH;
2045 				else if (iterator.this_arg[3] == 11)
2046 					rate_flags |=
2047 						IEEE80211_TX_RC_160_MHZ_WIDTH;
2048 			}
2049 
2050 			vht_mcs = iterator.this_arg[4] >> 4;
2051 			vht_nss = iterator.this_arg[4] & 0xF;
2052 			break;
2053 
2054 		/*
2055 		 * Please update the file
2056 		 * Documentation/networking/mac80211-injection.txt
2057 		 * when parsing new fields here.
2058 		 */
2059 
2060 		default:
2061 			break;
2062 		}
2063 	}
2064 
2065 	if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2066 		return false;
2067 
2068 	if (rate_found) {
2069 		info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2070 
2071 		for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2072 			info->control.rates[i].idx = -1;
2073 			info->control.rates[i].flags = 0;
2074 			info->control.rates[i].count = 0;
2075 		}
2076 
2077 		if (rate_flags & IEEE80211_TX_RC_MCS) {
2078 			info->control.rates[0].idx = rate;
2079 		} else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2080 			ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2081 					       vht_nss);
2082 		} else {
2083 			for (i = 0; i < sband->n_bitrates; i++) {
2084 				if (rate * 5 != sband->bitrates[i].bitrate)
2085 					continue;
2086 
2087 				info->control.rates[0].idx = i;
2088 				break;
2089 			}
2090 		}
2091 
2092 		if (info->control.rates[0].idx < 0)
2093 			info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2094 
2095 		info->control.rates[0].flags = rate_flags;
2096 		info->control.rates[0].count = min_t(u8, rate_retries + 1,
2097 						     local->hw.max_rate_tries);
2098 	}
2099 
2100 	/*
2101 	 * remove the radiotap header
2102 	 * iterator->_max_length was sanity-checked against
2103 	 * skb->len by iterator init
2104 	 */
2105 	skb_pull(skb, iterator._max_length);
2106 
2107 	return true;
2108 }
2109 
2110 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2111 					 struct net_device *dev)
2112 {
2113 	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2114 	struct ieee80211_chanctx_conf *chanctx_conf;
2115 	struct ieee80211_radiotap_header *prthdr =
2116 		(struct ieee80211_radiotap_header *)skb->data;
2117 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2118 	struct ieee80211_hdr *hdr;
2119 	struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2120 	struct cfg80211_chan_def *chandef;
2121 	u16 len_rthdr;
2122 	int hdrlen;
2123 
2124 	/* check for not even having the fixed radiotap header part */
2125 	if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2126 		goto fail; /* too short to be possibly valid */
2127 
2128 	/* is it a header version we can trust to find length from? */
2129 	if (unlikely(prthdr->it_version))
2130 		goto fail; /* only version 0 is supported */
2131 
2132 	/* then there must be a radiotap header with a length we can use */
2133 	len_rthdr = ieee80211_get_radiotap_len(skb->data);
2134 
2135 	/* does the skb contain enough to deliver on the alleged length? */
2136 	if (unlikely(skb->len < len_rthdr))
2137 		goto fail; /* skb too short for claimed rt header extent */
2138 
2139 	/*
2140 	 * fix up the pointers accounting for the radiotap
2141 	 * header still being in there.  We are being given
2142 	 * a precooked IEEE80211 header so no need for
2143 	 * normal processing
2144 	 */
2145 	skb_set_mac_header(skb, len_rthdr);
2146 	/*
2147 	 * these are just fixed to the end of the rt area since we
2148 	 * don't have any better information and at this point, nobody cares
2149 	 */
2150 	skb_set_network_header(skb, len_rthdr);
2151 	skb_set_transport_header(skb, len_rthdr);
2152 
2153 	if (skb->len < len_rthdr + 2)
2154 		goto fail;
2155 
2156 	hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2157 	hdrlen = ieee80211_hdrlen(hdr->frame_control);
2158 
2159 	if (skb->len < len_rthdr + hdrlen)
2160 		goto fail;
2161 
2162 	/*
2163 	 * Initialize skb->protocol if the injected frame is a data frame
2164 	 * carrying a rfc1042 header
2165 	 */
2166 	if (ieee80211_is_data(hdr->frame_control) &&
2167 	    skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2168 		u8 *payload = (u8 *)hdr + hdrlen;
2169 
2170 		if (ether_addr_equal(payload, rfc1042_header))
2171 			skb->protocol = cpu_to_be16((payload[6] << 8) |
2172 						    payload[7]);
2173 	}
2174 
2175 	memset(info, 0, sizeof(*info));
2176 
2177 	info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2178 		      IEEE80211_TX_CTL_INJECTED;
2179 
2180 	rcu_read_lock();
2181 
2182 	/*
2183 	 * We process outgoing injected frames that have a local address
2184 	 * we handle as though they are non-injected frames.
2185 	 * This code here isn't entirely correct, the local MAC address
2186 	 * isn't always enough to find the interface to use; for proper
2187 	 * VLAN/WDS support we will need a different mechanism (which
2188 	 * likely isn't going to be monitor interfaces).
2189 	 */
2190 	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2191 
2192 	list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2193 		if (!ieee80211_sdata_running(tmp_sdata))
2194 			continue;
2195 		if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2196 		    tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2197 		    tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2198 			continue;
2199 		if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2200 			sdata = tmp_sdata;
2201 			break;
2202 		}
2203 	}
2204 
2205 	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2206 	if (!chanctx_conf) {
2207 		tmp_sdata = rcu_dereference(local->monitor_sdata);
2208 		if (tmp_sdata)
2209 			chanctx_conf =
2210 				rcu_dereference(tmp_sdata->vif.chanctx_conf);
2211 	}
2212 
2213 	if (chanctx_conf)
2214 		chandef = &chanctx_conf->def;
2215 	else if (!local->use_chanctx)
2216 		chandef = &local->_oper_chandef;
2217 	else
2218 		goto fail_rcu;
2219 
2220 	/*
2221 	 * Frame injection is not allowed if beaconing is not allowed
2222 	 * or if we need radar detection. Beaconing is usually not allowed when
2223 	 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2224 	 * Passive scan is also used in world regulatory domains where
2225 	 * your country is not known and as such it should be treated as
2226 	 * NO TX unless the channel is explicitly allowed in which case
2227 	 * your current regulatory domain would not have the passive scan
2228 	 * flag.
2229 	 *
2230 	 * Since AP mode uses monitor interfaces to inject/TX management
2231 	 * frames we can make AP mode the exception to this rule once it
2232 	 * supports radar detection as its implementation can deal with
2233 	 * radar detection by itself. We can do that later by adding a
2234 	 * monitor flag interfaces used for AP support.
2235 	 */
2236 	if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2237 				     sdata->vif.type))
2238 		goto fail_rcu;
2239 
2240 	info->band = chandef->chan->band;
2241 
2242 	/* process and remove the injection radiotap header */
2243 	if (!ieee80211_parse_tx_radiotap(local, skb))
2244 		goto fail_rcu;
2245 
2246 	ieee80211_xmit(sdata, NULL, skb);
2247 	rcu_read_unlock();
2248 
2249 	return NETDEV_TX_OK;
2250 
2251 fail_rcu:
2252 	rcu_read_unlock();
2253 fail:
2254 	dev_kfree_skb(skb);
2255 	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2256 }
2257 
2258 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2259 {
2260 	u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2261 
2262 	return ethertype == ETH_P_TDLS &&
2263 	       skb->len > 14 &&
2264 	       skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2265 }
2266 
2267 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2268 				   struct sk_buff *skb,
2269 				   struct sta_info **sta_out)
2270 {
2271 	struct sta_info *sta;
2272 
2273 	switch (sdata->vif.type) {
2274 	case NL80211_IFTYPE_AP_VLAN:
2275 		sta = rcu_dereference(sdata->u.vlan.sta);
2276 		if (sta) {
2277 			*sta_out = sta;
2278 			return 0;
2279 		} else if (sdata->wdev.use_4addr) {
2280 			return -ENOLINK;
2281 		}
2282 		/* fall through */
2283 	case NL80211_IFTYPE_AP:
2284 	case NL80211_IFTYPE_OCB:
2285 	case NL80211_IFTYPE_ADHOC:
2286 		if (is_multicast_ether_addr(skb->data)) {
2287 			*sta_out = ERR_PTR(-ENOENT);
2288 			return 0;
2289 		}
2290 		sta = sta_info_get_bss(sdata, skb->data);
2291 		break;
2292 	case NL80211_IFTYPE_WDS:
2293 		sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2294 		break;
2295 #ifdef CONFIG_MAC80211_MESH
2296 	case NL80211_IFTYPE_MESH_POINT:
2297 		/* determined much later */
2298 		*sta_out = NULL;
2299 		return 0;
2300 #endif
2301 	case NL80211_IFTYPE_STATION:
2302 		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2303 			sta = sta_info_get(sdata, skb->data);
2304 			if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2305 				if (test_sta_flag(sta,
2306 						  WLAN_STA_TDLS_PEER_AUTH)) {
2307 					*sta_out = sta;
2308 					return 0;
2309 				}
2310 
2311 				/*
2312 				 * TDLS link during setup - throw out frames to
2313 				 * peer. Allow TDLS-setup frames to unauthorized
2314 				 * peers for the special case of a link teardown
2315 				 * after a TDLS sta is removed due to being
2316 				 * unreachable.
2317 				 */
2318 				if (!ieee80211_is_tdls_setup(skb))
2319 					return -EINVAL;
2320 			}
2321 
2322 		}
2323 
2324 		sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2325 		if (!sta)
2326 			return -ENOLINK;
2327 		break;
2328 	default:
2329 		return -EINVAL;
2330 	}
2331 
2332 	*sta_out = sta ?: ERR_PTR(-ENOENT);
2333 	return 0;
2334 }
2335 
2336 /**
2337  * ieee80211_build_hdr - build 802.11 header in the given frame
2338  * @sdata: virtual interface to build the header for
2339  * @skb: the skb to build the header in
2340  * @info_flags: skb flags to set
2341  *
2342  * This function takes the skb with 802.3 header and reformats the header to
2343  * the appropriate IEEE 802.11 header based on which interface the packet is
2344  * being transmitted on.
2345  *
2346  * Note that this function also takes care of the TX status request and
2347  * potential unsharing of the SKB - this needs to be interleaved with the
2348  * header building.
2349  *
2350  * The function requires the read-side RCU lock held
2351  *
2352  * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2353  */
2354 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2355 					   struct sk_buff *skb, u32 info_flags,
2356 					   struct sta_info *sta)
2357 {
2358 	struct ieee80211_local *local = sdata->local;
2359 	struct ieee80211_tx_info *info;
2360 	int head_need;
2361 	u16 ethertype, hdrlen,  meshhdrlen = 0;
2362 	__le16 fc;
2363 	struct ieee80211_hdr hdr;
2364 	struct ieee80211s_hdr mesh_hdr __maybe_unused;
2365 	struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2366 	const u8 *encaps_data;
2367 	int encaps_len, skip_header_bytes;
2368 	bool wme_sta = false, authorized = false;
2369 	bool tdls_peer;
2370 	bool multicast;
2371 	u16 info_id = 0;
2372 	struct ieee80211_chanctx_conf *chanctx_conf;
2373 	struct ieee80211_sub_if_data *ap_sdata;
2374 	enum nl80211_band band;
2375 	int ret;
2376 
2377 	if (IS_ERR(sta))
2378 		sta = NULL;
2379 
2380 	/* convert Ethernet header to proper 802.11 header (based on
2381 	 * operation mode) */
2382 	ethertype = (skb->data[12] << 8) | skb->data[13];
2383 	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2384 
2385 	switch (sdata->vif.type) {
2386 	case NL80211_IFTYPE_AP_VLAN:
2387 		if (sdata->wdev.use_4addr) {
2388 			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2389 			/* RA TA DA SA */
2390 			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2391 			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2392 			memcpy(hdr.addr3, skb->data, ETH_ALEN);
2393 			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2394 			hdrlen = 30;
2395 			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2396 			wme_sta = sta->sta.wme;
2397 		}
2398 		ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2399 					u.ap);
2400 		chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2401 		if (!chanctx_conf) {
2402 			ret = -ENOTCONN;
2403 			goto free;
2404 		}
2405 		band = chanctx_conf->def.chan->band;
2406 		if (sdata->wdev.use_4addr)
2407 			break;
2408 		/* fall through */
2409 	case NL80211_IFTYPE_AP:
2410 		if (sdata->vif.type == NL80211_IFTYPE_AP)
2411 			chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2412 		if (!chanctx_conf) {
2413 			ret = -ENOTCONN;
2414 			goto free;
2415 		}
2416 		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2417 		/* DA BSSID SA */
2418 		memcpy(hdr.addr1, skb->data, ETH_ALEN);
2419 		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2420 		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2421 		hdrlen = 24;
2422 		band = chanctx_conf->def.chan->band;
2423 		break;
2424 	case NL80211_IFTYPE_WDS:
2425 		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2426 		/* RA TA DA SA */
2427 		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2428 		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2429 		memcpy(hdr.addr3, skb->data, ETH_ALEN);
2430 		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2431 		hdrlen = 30;
2432 		/*
2433 		 * This is the exception! WDS style interfaces are prohibited
2434 		 * when channel contexts are in used so this must be valid
2435 		 */
2436 		band = local->hw.conf.chandef.chan->band;
2437 		break;
2438 #ifdef CONFIG_MAC80211_MESH
2439 	case NL80211_IFTYPE_MESH_POINT:
2440 		if (!is_multicast_ether_addr(skb->data)) {
2441 			struct sta_info *next_hop;
2442 			bool mpp_lookup = true;
2443 
2444 			mpath = mesh_path_lookup(sdata, skb->data);
2445 			if (mpath) {
2446 				mpp_lookup = false;
2447 				next_hop = rcu_dereference(mpath->next_hop);
2448 				if (!next_hop ||
2449 				    !(mpath->flags & (MESH_PATH_ACTIVE |
2450 						      MESH_PATH_RESOLVING)))
2451 					mpp_lookup = true;
2452 			}
2453 
2454 			if (mpp_lookup) {
2455 				mppath = mpp_path_lookup(sdata, skb->data);
2456 				if (mppath)
2457 					mppath->exp_time = jiffies;
2458 			}
2459 
2460 			if (mppath && mpath)
2461 				mesh_path_del(sdata, mpath->dst);
2462 		}
2463 
2464 		/*
2465 		 * Use address extension if it is a packet from
2466 		 * another interface or if we know the destination
2467 		 * is being proxied by a portal (i.e. portal address
2468 		 * differs from proxied address)
2469 		 */
2470 		if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2471 		    !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2472 			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2473 					skb->data, skb->data + ETH_ALEN);
2474 			meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2475 							       NULL, NULL);
2476 		} else {
2477 			/* DS -> MBSS (802.11-2012 13.11.3.3).
2478 			 * For unicast with unknown forwarding information,
2479 			 * destination might be in the MBSS or if that fails
2480 			 * forwarded to another mesh gate. In either case
2481 			 * resolution will be handled in ieee80211_xmit(), so
2482 			 * leave the original DA. This also works for mcast */
2483 			const u8 *mesh_da = skb->data;
2484 
2485 			if (mppath)
2486 				mesh_da = mppath->mpp;
2487 			else if (mpath)
2488 				mesh_da = mpath->dst;
2489 
2490 			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2491 					mesh_da, sdata->vif.addr);
2492 			if (is_multicast_ether_addr(mesh_da))
2493 				/* DA TA mSA AE:SA */
2494 				meshhdrlen = ieee80211_new_mesh_header(
2495 						sdata, &mesh_hdr,
2496 						skb->data + ETH_ALEN, NULL);
2497 			else
2498 				/* RA TA mDA mSA AE:DA SA */
2499 				meshhdrlen = ieee80211_new_mesh_header(
2500 						sdata, &mesh_hdr, skb->data,
2501 						skb->data + ETH_ALEN);
2502 
2503 		}
2504 		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2505 		if (!chanctx_conf) {
2506 			ret = -ENOTCONN;
2507 			goto free;
2508 		}
2509 		band = chanctx_conf->def.chan->band;
2510 		break;
2511 #endif
2512 	case NL80211_IFTYPE_STATION:
2513 		/* we already did checks when looking up the RA STA */
2514 		tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2515 
2516 		if (tdls_peer) {
2517 			/* DA SA BSSID */
2518 			memcpy(hdr.addr1, skb->data, ETH_ALEN);
2519 			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2520 			memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2521 			hdrlen = 24;
2522 		}  else if (sdata->u.mgd.use_4addr &&
2523 			    cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2524 			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2525 					  IEEE80211_FCTL_TODS);
2526 			/* RA TA DA SA */
2527 			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2528 			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2529 			memcpy(hdr.addr3, skb->data, ETH_ALEN);
2530 			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2531 			hdrlen = 30;
2532 		} else {
2533 			fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2534 			/* BSSID SA DA */
2535 			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2536 			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2537 			memcpy(hdr.addr3, skb->data, ETH_ALEN);
2538 			hdrlen = 24;
2539 		}
2540 		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2541 		if (!chanctx_conf) {
2542 			ret = -ENOTCONN;
2543 			goto free;
2544 		}
2545 		band = chanctx_conf->def.chan->band;
2546 		break;
2547 	case NL80211_IFTYPE_OCB:
2548 		/* DA SA BSSID */
2549 		memcpy(hdr.addr1, skb->data, ETH_ALEN);
2550 		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2551 		eth_broadcast_addr(hdr.addr3);
2552 		hdrlen = 24;
2553 		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2554 		if (!chanctx_conf) {
2555 			ret = -ENOTCONN;
2556 			goto free;
2557 		}
2558 		band = chanctx_conf->def.chan->band;
2559 		break;
2560 	case NL80211_IFTYPE_ADHOC:
2561 		/* DA SA BSSID */
2562 		memcpy(hdr.addr1, skb->data, ETH_ALEN);
2563 		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2564 		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2565 		hdrlen = 24;
2566 		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2567 		if (!chanctx_conf) {
2568 			ret = -ENOTCONN;
2569 			goto free;
2570 		}
2571 		band = chanctx_conf->def.chan->band;
2572 		break;
2573 	default:
2574 		ret = -EINVAL;
2575 		goto free;
2576 	}
2577 
2578 	multicast = is_multicast_ether_addr(hdr.addr1);
2579 
2580 	/* sta is always NULL for mesh */
2581 	if (sta) {
2582 		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2583 		wme_sta = sta->sta.wme;
2584 	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2585 		/* For mesh, the use of the QoS header is mandatory */
2586 		wme_sta = true;
2587 	}
2588 
2589 	/* receiver does QoS (which also means we do) use it */
2590 	if (wme_sta) {
2591 		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2592 		hdrlen += 2;
2593 	}
2594 
2595 	/*
2596 	 * Drop unicast frames to unauthorised stations unless they are
2597 	 * EAPOL frames from the local station.
2598 	 */
2599 	if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2600 		     (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2601 		     !multicast && !authorized &&
2602 		     (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2603 		      !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2604 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2605 		net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2606 				    sdata->name, hdr.addr1);
2607 #endif
2608 
2609 		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2610 
2611 		ret = -EPERM;
2612 		goto free;
2613 	}
2614 
2615 	if (unlikely(!multicast && skb->sk &&
2616 		     skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2617 		struct sk_buff *ack_skb = skb_clone_sk(skb);
2618 
2619 		if (ack_skb) {
2620 			unsigned long flags;
2621 			int id;
2622 
2623 			spin_lock_irqsave(&local->ack_status_lock, flags);
2624 			id = idr_alloc(&local->ack_status_frames, ack_skb,
2625 				       1, 0x10000, GFP_ATOMIC);
2626 			spin_unlock_irqrestore(&local->ack_status_lock, flags);
2627 
2628 			if (id >= 0) {
2629 				info_id = id;
2630 				info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2631 			} else {
2632 				kfree_skb(ack_skb);
2633 			}
2634 		}
2635 	}
2636 
2637 	/*
2638 	 * If the skb is shared we need to obtain our own copy.
2639 	 */
2640 	if (skb_shared(skb)) {
2641 		struct sk_buff *tmp_skb = skb;
2642 
2643 		/* can't happen -- skb is a clone if info_id != 0 */
2644 		WARN_ON(info_id);
2645 
2646 		skb = skb_clone(skb, GFP_ATOMIC);
2647 		kfree_skb(tmp_skb);
2648 
2649 		if (!skb) {
2650 			ret = -ENOMEM;
2651 			goto free;
2652 		}
2653 	}
2654 
2655 	hdr.frame_control = fc;
2656 	hdr.duration_id = 0;
2657 	hdr.seq_ctrl = 0;
2658 
2659 	skip_header_bytes = ETH_HLEN;
2660 	if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2661 		encaps_data = bridge_tunnel_header;
2662 		encaps_len = sizeof(bridge_tunnel_header);
2663 		skip_header_bytes -= 2;
2664 	} else if (ethertype >= ETH_P_802_3_MIN) {
2665 		encaps_data = rfc1042_header;
2666 		encaps_len = sizeof(rfc1042_header);
2667 		skip_header_bytes -= 2;
2668 	} else {
2669 		encaps_data = NULL;
2670 		encaps_len = 0;
2671 	}
2672 
2673 	skb_pull(skb, skip_header_bytes);
2674 	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2675 
2676 	/*
2677 	 * So we need to modify the skb header and hence need a copy of
2678 	 * that. The head_need variable above doesn't, so far, include
2679 	 * the needed header space that we don't need right away. If we
2680 	 * can, then we don't reallocate right now but only after the
2681 	 * frame arrives at the master device (if it does...)
2682 	 *
2683 	 * If we cannot, however, then we will reallocate to include all
2684 	 * the ever needed space. Also, if we need to reallocate it anyway,
2685 	 * make it big enough for everything we may ever need.
2686 	 */
2687 
2688 	if (head_need > 0 || skb_cloned(skb)) {
2689 		head_need += sdata->encrypt_headroom;
2690 		head_need += local->tx_headroom;
2691 		head_need = max_t(int, 0, head_need);
2692 		if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2693 			ieee80211_free_txskb(&local->hw, skb);
2694 			skb = NULL;
2695 			return ERR_PTR(-ENOMEM);
2696 		}
2697 	}
2698 
2699 	if (encaps_data)
2700 		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2701 
2702 #ifdef CONFIG_MAC80211_MESH
2703 	if (meshhdrlen > 0)
2704 		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2705 #endif
2706 
2707 	if (ieee80211_is_data_qos(fc)) {
2708 		__le16 *qos_control;
2709 
2710 		qos_control = (__le16 *) skb_push(skb, 2);
2711 		memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2712 		/*
2713 		 * Maybe we could actually set some fields here, for now just
2714 		 * initialise to zero to indicate no special operation.
2715 		 */
2716 		*qos_control = 0;
2717 	} else
2718 		memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2719 
2720 	skb_reset_mac_header(skb);
2721 
2722 	info = IEEE80211_SKB_CB(skb);
2723 	memset(info, 0, sizeof(*info));
2724 
2725 	info->flags = info_flags;
2726 	info->ack_frame_id = info_id;
2727 	info->band = band;
2728 
2729 	return skb;
2730  free:
2731 	kfree_skb(skb);
2732 	return ERR_PTR(ret);
2733 }
2734 
2735 /*
2736  * fast-xmit overview
2737  *
2738  * The core idea of this fast-xmit is to remove per-packet checks by checking
2739  * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2740  * checks that are needed to get the sta->fast_tx pointer assigned, after which
2741  * much less work can be done per packet. For example, fragmentation must be
2742  * disabled or the fast_tx pointer will not be set. All the conditions are seen
2743  * in the code here.
2744  *
2745  * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2746  * header and other data to aid packet processing in ieee80211_xmit_fast().
2747  *
2748  * The most difficult part of this is that when any of these assumptions
2749  * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2750  * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2751  * since the per-packet code no longer checks the conditions. This is reflected
2752  * by the calls to these functions throughout the rest of the code, and must be
2753  * maintained if any of the TX path checks change.
2754  */
2755 
2756 void ieee80211_check_fast_xmit(struct sta_info *sta)
2757 {
2758 	struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2759 	struct ieee80211_local *local = sta->local;
2760 	struct ieee80211_sub_if_data *sdata = sta->sdata;
2761 	struct ieee80211_hdr *hdr = (void *)build.hdr;
2762 	struct ieee80211_chanctx_conf *chanctx_conf;
2763 	__le16 fc;
2764 
2765 	if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2766 		return;
2767 
2768 	/* Locking here protects both the pointer itself, and against concurrent
2769 	 * invocations winning data access races to, e.g., the key pointer that
2770 	 * is used.
2771 	 * Without it, the invocation of this function right after the key
2772 	 * pointer changes wouldn't be sufficient, as another CPU could access
2773 	 * the pointer, then stall, and then do the cache update after the CPU
2774 	 * that invalidated the key.
2775 	 * With the locking, such scenarios cannot happen as the check for the
2776 	 * key and the fast-tx assignment are done atomically, so the CPU that
2777 	 * modifies the key will either wait or other one will see the key
2778 	 * cleared/changed already.
2779 	 */
2780 	spin_lock_bh(&sta->lock);
2781 	if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2782 	    !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2783 	    sdata->vif.type == NL80211_IFTYPE_STATION)
2784 		goto out;
2785 
2786 	if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2787 		goto out;
2788 
2789 	if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2790 	    test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2791 	    test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2792 	    test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2793 		goto out;
2794 
2795 	if (sdata->noack_map)
2796 		goto out;
2797 
2798 	/* fast-xmit doesn't handle fragmentation at all */
2799 	if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2800 	    !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
2801 		goto out;
2802 
2803 	rcu_read_lock();
2804 	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2805 	if (!chanctx_conf) {
2806 		rcu_read_unlock();
2807 		goto out;
2808 	}
2809 	build.band = chanctx_conf->def.chan->band;
2810 	rcu_read_unlock();
2811 
2812 	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2813 
2814 	switch (sdata->vif.type) {
2815 	case NL80211_IFTYPE_ADHOC:
2816 		/* DA SA BSSID */
2817 		build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2818 		build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2819 		memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2820 		build.hdr_len = 24;
2821 		break;
2822 	case NL80211_IFTYPE_STATION:
2823 		if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2824 			/* DA SA BSSID */
2825 			build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2826 			build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2827 			memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2828 			build.hdr_len = 24;
2829 			break;
2830 		}
2831 
2832 		if (sdata->u.mgd.use_4addr) {
2833 			/* non-regular ethertype cannot use the fastpath */
2834 			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2835 					  IEEE80211_FCTL_TODS);
2836 			/* RA TA DA SA */
2837 			memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2838 			memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2839 			build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2840 			build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2841 			build.hdr_len = 30;
2842 			break;
2843 		}
2844 		fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2845 		/* BSSID SA DA */
2846 		memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2847 		build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2848 		build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2849 		build.hdr_len = 24;
2850 		break;
2851 	case NL80211_IFTYPE_AP_VLAN:
2852 		if (sdata->wdev.use_4addr) {
2853 			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2854 					  IEEE80211_FCTL_TODS);
2855 			/* RA TA DA SA */
2856 			memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2857 			memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2858 			build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2859 			build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2860 			build.hdr_len = 30;
2861 			break;
2862 		}
2863 		/* fall through */
2864 	case NL80211_IFTYPE_AP:
2865 		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2866 		/* DA BSSID SA */
2867 		build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2868 		memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2869 		build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2870 		build.hdr_len = 24;
2871 		break;
2872 	default:
2873 		/* not handled on fast-xmit */
2874 		goto out;
2875 	}
2876 
2877 	if (sta->sta.wme) {
2878 		build.hdr_len += 2;
2879 		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2880 	}
2881 
2882 	/* We store the key here so there's no point in using rcu_dereference()
2883 	 * but that's fine because the code that changes the pointers will call
2884 	 * this function after doing so. For a single CPU that would be enough,
2885 	 * for multiple see the comment above.
2886 	 */
2887 	build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2888 	if (!build.key)
2889 		build.key = rcu_access_pointer(sdata->default_unicast_key);
2890 	if (build.key) {
2891 		bool gen_iv, iv_spc, mmic;
2892 
2893 		gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2894 		iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2895 		mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
2896 
2897 		/* don't handle software crypto */
2898 		if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2899 			goto out;
2900 
2901 		switch (build.key->conf.cipher) {
2902 		case WLAN_CIPHER_SUITE_CCMP:
2903 		case WLAN_CIPHER_SUITE_CCMP_256:
2904 			/* add fixed key ID */
2905 			if (gen_iv) {
2906 				(build.hdr + build.hdr_len)[3] =
2907 					0x20 | (build.key->conf.keyidx << 6);
2908 				build.pn_offs = build.hdr_len;
2909 			}
2910 			if (gen_iv || iv_spc)
2911 				build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2912 			break;
2913 		case WLAN_CIPHER_SUITE_GCMP:
2914 		case WLAN_CIPHER_SUITE_GCMP_256:
2915 			/* add fixed key ID */
2916 			if (gen_iv) {
2917 				(build.hdr + build.hdr_len)[3] =
2918 					0x20 | (build.key->conf.keyidx << 6);
2919 				build.pn_offs = build.hdr_len;
2920 			}
2921 			if (gen_iv || iv_spc)
2922 				build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2923 			break;
2924 		case WLAN_CIPHER_SUITE_TKIP:
2925 			/* cannot handle MMIC or IV generation in xmit-fast */
2926 			if (mmic || gen_iv)
2927 				goto out;
2928 			if (iv_spc)
2929 				build.hdr_len += IEEE80211_TKIP_IV_LEN;
2930 			break;
2931 		case WLAN_CIPHER_SUITE_WEP40:
2932 		case WLAN_CIPHER_SUITE_WEP104:
2933 			/* cannot handle IV generation in fast-xmit */
2934 			if (gen_iv)
2935 				goto out;
2936 			if (iv_spc)
2937 				build.hdr_len += IEEE80211_WEP_IV_LEN;
2938 			break;
2939 		case WLAN_CIPHER_SUITE_AES_CMAC:
2940 		case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2941 		case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2942 		case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2943 			WARN(1,
2944 			     "management cipher suite 0x%x enabled for data\n",
2945 			     build.key->conf.cipher);
2946 			goto out;
2947 		default:
2948 			/* we don't know how to generate IVs for this at all */
2949 			if (WARN_ON(gen_iv))
2950 				goto out;
2951 			/* pure hardware keys are OK, of course */
2952 			if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2953 				break;
2954 			/* cipher scheme might require space allocation */
2955 			if (iv_spc &&
2956 			    build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2957 				goto out;
2958 			if (iv_spc)
2959 				build.hdr_len += build.key->conf.iv_len;
2960 		}
2961 
2962 		fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2963 	}
2964 
2965 	hdr->frame_control = fc;
2966 
2967 	memcpy(build.hdr + build.hdr_len,
2968 	       rfc1042_header,  sizeof(rfc1042_header));
2969 	build.hdr_len += sizeof(rfc1042_header);
2970 
2971 	fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2972 	/* if the kmemdup fails, continue w/o fast_tx */
2973 	if (!fast_tx)
2974 		goto out;
2975 
2976  out:
2977 	/* we might have raced against another call to this function */
2978 	old = rcu_dereference_protected(sta->fast_tx,
2979 					lockdep_is_held(&sta->lock));
2980 	rcu_assign_pointer(sta->fast_tx, fast_tx);
2981 	if (old)
2982 		kfree_rcu(old, rcu_head);
2983 	spin_unlock_bh(&sta->lock);
2984 }
2985 
2986 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2987 {
2988 	struct sta_info *sta;
2989 
2990 	rcu_read_lock();
2991 	list_for_each_entry_rcu(sta, &local->sta_list, list)
2992 		ieee80211_check_fast_xmit(sta);
2993 	rcu_read_unlock();
2994 }
2995 
2996 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
2997 {
2998 	struct ieee80211_local *local = sdata->local;
2999 	struct sta_info *sta;
3000 
3001 	rcu_read_lock();
3002 
3003 	list_for_each_entry_rcu(sta, &local->sta_list, list) {
3004 		if (sdata != sta->sdata &&
3005 		    (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3006 			continue;
3007 		ieee80211_check_fast_xmit(sta);
3008 	}
3009 
3010 	rcu_read_unlock();
3011 }
3012 
3013 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3014 {
3015 	struct ieee80211_fast_tx *fast_tx;
3016 
3017 	spin_lock_bh(&sta->lock);
3018 	fast_tx = rcu_dereference_protected(sta->fast_tx,
3019 					    lockdep_is_held(&sta->lock));
3020 	RCU_INIT_POINTER(sta->fast_tx, NULL);
3021 	spin_unlock_bh(&sta->lock);
3022 
3023 	if (fast_tx)
3024 		kfree_rcu(fast_tx, rcu_head);
3025 }
3026 
3027 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3028 					struct sk_buff *skb, int headroom,
3029 					int *subframe_len)
3030 {
3031 	int amsdu_len = *subframe_len + sizeof(struct ethhdr);
3032 	int padding = (4 - amsdu_len) & 3;
3033 
3034 	if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) {
3035 		I802_DEBUG_INC(local->tx_expand_skb_head);
3036 
3037 		if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) {
3038 			wiphy_debug(local->hw.wiphy,
3039 				    "failed to reallocate TX buffer\n");
3040 			return false;
3041 		}
3042 	}
3043 
3044 	if (padding) {
3045 		*subframe_len += padding;
3046 		memset(skb_put(skb, padding), 0, padding);
3047 	}
3048 
3049 	return true;
3050 }
3051 
3052 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3053 					 struct ieee80211_fast_tx *fast_tx,
3054 					 struct sk_buff *skb)
3055 {
3056 	struct ieee80211_local *local = sdata->local;
3057 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3058 	struct ieee80211_hdr *hdr;
3059 	struct ethhdr *amsdu_hdr;
3060 	int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3061 	int subframe_len = skb->len - hdr_len;
3062 	void *data;
3063 	u8 *qc, *h_80211_src, *h_80211_dst;
3064 	const u8 *bssid;
3065 
3066 	if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3067 		return false;
3068 
3069 	if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3070 		return true;
3071 
3072 	if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr),
3073 					 &subframe_len))
3074 		return false;
3075 
3076 	data = skb_push(skb, sizeof(*amsdu_hdr));
3077 	memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3078 	hdr = data;
3079 	amsdu_hdr = data + hdr_len;
3080 	/* h_80211_src/dst is addr* field within hdr */
3081 	h_80211_src = data + fast_tx->sa_offs;
3082 	h_80211_dst = data + fast_tx->da_offs;
3083 
3084 	amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3085 	ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3086 	ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3087 
3088 	/* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3089 	 * fields needs to be changed to BSSID for A-MSDU frames depending
3090 	 * on FromDS/ToDS values.
3091 	 */
3092 	switch (sdata->vif.type) {
3093 	case NL80211_IFTYPE_STATION:
3094 		bssid = sdata->u.mgd.bssid;
3095 		break;
3096 	case NL80211_IFTYPE_AP:
3097 	case NL80211_IFTYPE_AP_VLAN:
3098 		bssid = sdata->vif.addr;
3099 		break;
3100 	default:
3101 		bssid = NULL;
3102 	}
3103 
3104 	if (bssid && ieee80211_has_fromds(hdr->frame_control))
3105 		ether_addr_copy(h_80211_src, bssid);
3106 
3107 	if (bssid && ieee80211_has_tods(hdr->frame_control))
3108 		ether_addr_copy(h_80211_dst, bssid);
3109 
3110 	qc = ieee80211_get_qos_ctl(hdr);
3111 	*qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3112 
3113 	info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3114 
3115 	return true;
3116 }
3117 
3118 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3119 				      struct sta_info *sta,
3120 				      struct ieee80211_fast_tx *fast_tx,
3121 				      struct sk_buff *skb)
3122 {
3123 	struct ieee80211_local *local = sdata->local;
3124 	struct fq *fq = &local->fq;
3125 	struct fq_tin *tin;
3126 	struct fq_flow *flow;
3127 	u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3128 	struct ieee80211_txq *txq = sta->sta.txq[tid];
3129 	struct txq_info *txqi;
3130 	struct sk_buff **frag_tail, *head;
3131 	int subframe_len = skb->len - ETH_ALEN;
3132 	u8 max_subframes = sta->sta.max_amsdu_subframes;
3133 	int max_frags = local->hw.max_tx_fragments;
3134 	int max_amsdu_len = sta->sta.max_amsdu_len;
3135 	__be16 len;
3136 	void *data;
3137 	bool ret = false;
3138 	unsigned int orig_len;
3139 	int n = 1, nfrags;
3140 
3141 	if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3142 		return false;
3143 
3144 	if (!txq)
3145 		return false;
3146 
3147 	txqi = to_txq_info(txq);
3148 	if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3149 		return false;
3150 
3151 	if (sta->sta.max_rc_amsdu_len)
3152 		max_amsdu_len = min_t(int, max_amsdu_len,
3153 				      sta->sta.max_rc_amsdu_len);
3154 
3155 	spin_lock_bh(&fq->lock);
3156 
3157 	/* TODO: Ideally aggregation should be done on dequeue to remain
3158 	 * responsive to environment changes.
3159 	 */
3160 
3161 	tin = &txqi->tin;
3162 	flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3163 	head = skb_peek_tail(&flow->queue);
3164 	if (!head)
3165 		goto out;
3166 
3167 	orig_len = head->len;
3168 
3169 	if (skb->len + head->len > max_amsdu_len)
3170 		goto out;
3171 
3172 	if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3173 		goto out;
3174 
3175 	nfrags = 1 + skb_shinfo(skb)->nr_frags;
3176 	nfrags += 1 + skb_shinfo(head)->nr_frags;
3177 	frag_tail = &skb_shinfo(head)->frag_list;
3178 	while (*frag_tail) {
3179 		nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3180 		frag_tail = &(*frag_tail)->next;
3181 		n++;
3182 	}
3183 
3184 	if (max_subframes && n > max_subframes)
3185 		goto out;
3186 
3187 	if (max_frags && nfrags > max_frags)
3188 		goto out;
3189 
3190 	if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2,
3191 					 &subframe_len))
3192 		goto out;
3193 
3194 	ret = true;
3195 	data = skb_push(skb, ETH_ALEN + 2);
3196 	memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3197 
3198 	data += 2 * ETH_ALEN;
3199 	len = cpu_to_be16(subframe_len);
3200 	memcpy(data, &len, 2);
3201 	memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3202 
3203 	head->len += skb->len;
3204 	head->data_len += skb->len;
3205 	*frag_tail = skb;
3206 
3207 	flow->backlog += head->len - orig_len;
3208 	tin->backlog_bytes += head->len - orig_len;
3209 
3210 	fq_recalc_backlog(fq, tin, flow);
3211 
3212 out:
3213 	spin_unlock_bh(&fq->lock);
3214 
3215 	return ret;
3216 }
3217 
3218 /*
3219  * Can be called while the sta lock is held. Anything that can cause packets to
3220  * be generated will cause deadlock!
3221  */
3222 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3223 				       struct sta_info *sta, u8 pn_offs,
3224 				       struct ieee80211_key *key,
3225 				       struct sk_buff *skb)
3226 {
3227 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3228 	struct ieee80211_hdr *hdr = (void *)skb->data;
3229 	u8 tid = IEEE80211_NUM_TIDS;
3230 
3231 	if (key)
3232 		info->control.hw_key = &key->conf;
3233 
3234 	ieee80211_tx_stats(skb->dev, skb->len);
3235 
3236 	if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3237 		tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3238 		hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3239 	} else {
3240 		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3241 		hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3242 		sdata->sequence_number += 0x10;
3243 	}
3244 
3245 	if (skb_shinfo(skb)->gso_size)
3246 		sta->tx_stats.msdu[tid] +=
3247 			DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3248 	else
3249 		sta->tx_stats.msdu[tid]++;
3250 
3251 	info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3252 
3253 	/* statistics normally done by ieee80211_tx_h_stats (but that
3254 	 * has to consider fragmentation, so is more complex)
3255 	 */
3256 	sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3257 	sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3258 
3259 	if (pn_offs) {
3260 		u64 pn;
3261 		u8 *crypto_hdr = skb->data + pn_offs;
3262 
3263 		switch (key->conf.cipher) {
3264 		case WLAN_CIPHER_SUITE_CCMP:
3265 		case WLAN_CIPHER_SUITE_CCMP_256:
3266 		case WLAN_CIPHER_SUITE_GCMP:
3267 		case WLAN_CIPHER_SUITE_GCMP_256:
3268 			pn = atomic64_inc_return(&key->conf.tx_pn);
3269 			crypto_hdr[0] = pn;
3270 			crypto_hdr[1] = pn >> 8;
3271 			crypto_hdr[4] = pn >> 16;
3272 			crypto_hdr[5] = pn >> 24;
3273 			crypto_hdr[6] = pn >> 32;
3274 			crypto_hdr[7] = pn >> 40;
3275 			break;
3276 		}
3277 	}
3278 }
3279 
3280 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3281 				struct sta_info *sta,
3282 				struct ieee80211_fast_tx *fast_tx,
3283 				struct sk_buff *skb)
3284 {
3285 	struct ieee80211_local *local = sdata->local;
3286 	u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3287 	int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3288 	int hw_headroom = sdata->local->hw.extra_tx_headroom;
3289 	struct ethhdr eth;
3290 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3291 	struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3292 	struct ieee80211_tx_data tx;
3293 	ieee80211_tx_result r;
3294 	struct tid_ampdu_tx *tid_tx = NULL;
3295 	u8 tid = IEEE80211_NUM_TIDS;
3296 
3297 	/* control port protocol needs a lot of special handling */
3298 	if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3299 		return false;
3300 
3301 	/* only RFC 1042 SNAP */
3302 	if (ethertype < ETH_P_802_3_MIN)
3303 		return false;
3304 
3305 	/* don't handle TX status request here either */
3306 	if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3307 		return false;
3308 
3309 	if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3310 		tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3311 		tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3312 		if (tid_tx) {
3313 			if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3314 				return false;
3315 			if (tid_tx->timeout)
3316 				tid_tx->last_tx = jiffies;
3317 		}
3318 	}
3319 
3320 	/* after this point (skb is modified) we cannot return false */
3321 
3322 	if (skb_shared(skb)) {
3323 		struct sk_buff *tmp_skb = skb;
3324 
3325 		skb = skb_clone(skb, GFP_ATOMIC);
3326 		kfree_skb(tmp_skb);
3327 
3328 		if (!skb)
3329 			return true;
3330 	}
3331 
3332 	if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3333 	    ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3334 		return true;
3335 
3336 	/* will not be crypto-handled beyond what we do here, so use false
3337 	 * as the may-encrypt argument for the resize to not account for
3338 	 * more room than we already have in 'extra_head'
3339 	 */
3340 	if (unlikely(ieee80211_skb_resize(sdata, skb,
3341 					  max_t(int, extra_head + hw_headroom -
3342 						     skb_headroom(skb), 0),
3343 					  false))) {
3344 		kfree_skb(skb);
3345 		return true;
3346 	}
3347 
3348 	memcpy(&eth, skb->data, ETH_HLEN - 2);
3349 	hdr = (void *)skb_push(skb, extra_head);
3350 	memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3351 	memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3352 	memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3353 
3354 	memset(info, 0, sizeof(*info));
3355 	info->band = fast_tx->band;
3356 	info->control.vif = &sdata->vif;
3357 	info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3358 		      IEEE80211_TX_CTL_DONTFRAG |
3359 		      (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3360 	info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3361 
3362 	if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3363 		tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3364 		*ieee80211_get_qos_ctl(hdr) = tid;
3365 	}
3366 
3367 	__skb_queue_head_init(&tx.skbs);
3368 
3369 	tx.flags = IEEE80211_TX_UNICAST;
3370 	tx.local = local;
3371 	tx.sdata = sdata;
3372 	tx.sta = sta;
3373 	tx.key = fast_tx->key;
3374 
3375 	if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3376 		tx.skb = skb;
3377 		r = ieee80211_tx_h_rate_ctrl(&tx);
3378 		skb = tx.skb;
3379 		tx.skb = NULL;
3380 
3381 		if (r != TX_CONTINUE) {
3382 			if (r != TX_QUEUED)
3383 				kfree_skb(skb);
3384 			return true;
3385 		}
3386 	}
3387 
3388 	if (ieee80211_queue_skb(local, sdata, sta, skb))
3389 		return true;
3390 
3391 	ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3392 				   fast_tx->key, skb);
3393 
3394 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3395 		sdata = container_of(sdata->bss,
3396 				     struct ieee80211_sub_if_data, u.ap);
3397 
3398 	__skb_queue_tail(&tx.skbs, skb);
3399 	ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3400 	return true;
3401 }
3402 
3403 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3404 				     struct ieee80211_txq *txq)
3405 {
3406 	struct ieee80211_local *local = hw_to_local(hw);
3407 	struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3408 	struct ieee80211_hdr *hdr;
3409 	struct sk_buff *skb = NULL;
3410 	struct fq *fq = &local->fq;
3411 	struct fq_tin *tin = &txqi->tin;
3412 	struct ieee80211_tx_info *info;
3413 	struct ieee80211_tx_data tx;
3414 	ieee80211_tx_result r;
3415 
3416 	spin_lock_bh(&fq->lock);
3417 
3418 	if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
3419 		goto out;
3420 
3421 	/* Make sure fragments stay together. */
3422 	skb = __skb_dequeue(&txqi->frags);
3423 	if (skb)
3424 		goto out;
3425 
3426 begin:
3427 	skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3428 	if (!skb)
3429 		goto out;
3430 
3431 	ieee80211_set_skb_vif(skb, txqi);
3432 
3433 	hdr = (struct ieee80211_hdr *)skb->data;
3434 	info = IEEE80211_SKB_CB(skb);
3435 
3436 	memset(&tx, 0, sizeof(tx));
3437 	__skb_queue_head_init(&tx.skbs);
3438 	tx.local = local;
3439 	tx.skb = skb;
3440 	tx.sdata = vif_to_sdata(info->control.vif);
3441 
3442 	if (txq->sta)
3443 		tx.sta = container_of(txq->sta, struct sta_info, sta);
3444 
3445 	/*
3446 	 * The key can be removed while the packet was queued, so need to call
3447 	 * this here to get the current key.
3448 	 */
3449 	r = ieee80211_tx_h_select_key(&tx);
3450 	if (r != TX_CONTINUE) {
3451 		ieee80211_free_txskb(&local->hw, skb);
3452 		goto begin;
3453 	}
3454 
3455 	if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3456 		info->flags |= IEEE80211_TX_CTL_AMPDU;
3457 	else
3458 		info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3459 
3460 	if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3461 		struct sta_info *sta = container_of(txq->sta, struct sta_info,
3462 						    sta);
3463 		u8 pn_offs = 0;
3464 
3465 		if (tx.key &&
3466 		    (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3467 			pn_offs = ieee80211_hdrlen(hdr->frame_control);
3468 
3469 		ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3470 					   tx.key, skb);
3471 	} else {
3472 		if (invoke_tx_handlers_late(&tx))
3473 			goto begin;
3474 
3475 		skb = __skb_dequeue(&tx.skbs);
3476 
3477 		if (!skb_queue_empty(&tx.skbs))
3478 			skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3479 	}
3480 
3481 	if (skb && skb_has_frag_list(skb) &&
3482 	    !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3483 		if (skb_linearize(skb)) {
3484 			ieee80211_free_txskb(&local->hw, skb);
3485 			goto begin;
3486 		}
3487 	}
3488 
3489 out:
3490 	spin_unlock_bh(&fq->lock);
3491 
3492 	return skb;
3493 }
3494 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3495 
3496 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3497 				  struct net_device *dev,
3498 				  u32 info_flags)
3499 {
3500 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3501 	struct sta_info *sta;
3502 	struct sk_buff *next;
3503 
3504 	if (unlikely(skb->len < ETH_HLEN)) {
3505 		kfree_skb(skb);
3506 		return;
3507 	}
3508 
3509 	rcu_read_lock();
3510 
3511 	if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3512 		goto out_free;
3513 
3514 	if (!IS_ERR_OR_NULL(sta)) {
3515 		struct ieee80211_fast_tx *fast_tx;
3516 
3517 		fast_tx = rcu_dereference(sta->fast_tx);
3518 
3519 		if (fast_tx &&
3520 		    ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
3521 			goto out;
3522 	}
3523 
3524 	if (skb_is_gso(skb)) {
3525 		struct sk_buff *segs;
3526 
3527 		segs = skb_gso_segment(skb, 0);
3528 		if (IS_ERR(segs)) {
3529 			goto out_free;
3530 		} else if (segs) {
3531 			consume_skb(skb);
3532 			skb = segs;
3533 		}
3534 	} else {
3535 		/* we cannot process non-linear frames on this path */
3536 		if (skb_linearize(skb)) {
3537 			kfree_skb(skb);
3538 			goto out;
3539 		}
3540 
3541 		/* the frame could be fragmented, software-encrypted, and other
3542 		 * things so we cannot really handle checksum offload with it -
3543 		 * fix it up in software before we handle anything else.
3544 		 */
3545 		if (skb->ip_summed == CHECKSUM_PARTIAL) {
3546 			skb_set_transport_header(skb,
3547 						 skb_checksum_start_offset(skb));
3548 			if (skb_checksum_help(skb))
3549 				goto out_free;
3550 		}
3551 	}
3552 
3553 	next = skb;
3554 	while (next) {
3555 		skb = next;
3556 		next = skb->next;
3557 
3558 		skb->prev = NULL;
3559 		skb->next = NULL;
3560 
3561 		skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3562 		if (IS_ERR(skb))
3563 			goto out;
3564 
3565 		ieee80211_tx_stats(dev, skb->len);
3566 
3567 		ieee80211_xmit(sdata, sta, skb);
3568 	}
3569 	goto out;
3570  out_free:
3571 	kfree_skb(skb);
3572  out:
3573 	rcu_read_unlock();
3574 }
3575 
3576 /**
3577  * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3578  * @skb: packet to be sent
3579  * @dev: incoming interface
3580  *
3581  * On failure skb will be freed.
3582  */
3583 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3584 				       struct net_device *dev)
3585 {
3586 	__ieee80211_subif_start_xmit(skb, dev, 0);
3587 	return NETDEV_TX_OK;
3588 }
3589 
3590 struct sk_buff *
3591 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3592 			      struct sk_buff *skb, u32 info_flags)
3593 {
3594 	struct ieee80211_hdr *hdr;
3595 	struct ieee80211_tx_data tx = {
3596 		.local = sdata->local,
3597 		.sdata = sdata,
3598 	};
3599 	struct sta_info *sta;
3600 
3601 	rcu_read_lock();
3602 
3603 	if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3604 		kfree_skb(skb);
3605 		skb = ERR_PTR(-EINVAL);
3606 		goto out;
3607 	}
3608 
3609 	skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3610 	if (IS_ERR(skb))
3611 		goto out;
3612 
3613 	hdr = (void *)skb->data;
3614 	tx.sta = sta_info_get(sdata, hdr->addr1);
3615 	tx.skb = skb;
3616 
3617 	if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3618 		rcu_read_unlock();
3619 		kfree_skb(skb);
3620 		return ERR_PTR(-EINVAL);
3621 	}
3622 
3623 out:
3624 	rcu_read_unlock();
3625 	return skb;
3626 }
3627 
3628 /*
3629  * ieee80211_clear_tx_pending may not be called in a context where
3630  * it is possible that it packets could come in again.
3631  */
3632 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3633 {
3634 	struct sk_buff *skb;
3635 	int i;
3636 
3637 	for (i = 0; i < local->hw.queues; i++) {
3638 		while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3639 			ieee80211_free_txskb(&local->hw, skb);
3640 	}
3641 }
3642 
3643 /*
3644  * Returns false if the frame couldn't be transmitted but was queued instead,
3645  * which in this case means re-queued -- take as an indication to stop sending
3646  * more pending frames.
3647  */
3648 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3649 				     struct sk_buff *skb)
3650 {
3651 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3652 	struct ieee80211_sub_if_data *sdata;
3653 	struct sta_info *sta;
3654 	struct ieee80211_hdr *hdr;
3655 	bool result;
3656 	struct ieee80211_chanctx_conf *chanctx_conf;
3657 
3658 	sdata = vif_to_sdata(info->control.vif);
3659 
3660 	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3661 		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3662 		if (unlikely(!chanctx_conf)) {
3663 			dev_kfree_skb(skb);
3664 			return true;
3665 		}
3666 		info->band = chanctx_conf->def.chan->band;
3667 		result = ieee80211_tx(sdata, NULL, skb, true);
3668 	} else {
3669 		struct sk_buff_head skbs;
3670 
3671 		__skb_queue_head_init(&skbs);
3672 		__skb_queue_tail(&skbs, skb);
3673 
3674 		hdr = (struct ieee80211_hdr *)skb->data;
3675 		sta = sta_info_get(sdata, hdr->addr1);
3676 
3677 		result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3678 	}
3679 
3680 	return result;
3681 }
3682 
3683 /*
3684  * Transmit all pending packets. Called from tasklet.
3685  */
3686 void ieee80211_tx_pending(unsigned long data)
3687 {
3688 	struct ieee80211_local *local = (struct ieee80211_local *)data;
3689 	unsigned long flags;
3690 	int i;
3691 	bool txok;
3692 
3693 	rcu_read_lock();
3694 
3695 	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3696 	for (i = 0; i < local->hw.queues; i++) {
3697 		/*
3698 		 * If queue is stopped by something other than due to pending
3699 		 * frames, or we have no pending frames, proceed to next queue.
3700 		 */
3701 		if (local->queue_stop_reasons[i] ||
3702 		    skb_queue_empty(&local->pending[i]))
3703 			continue;
3704 
3705 		while (!skb_queue_empty(&local->pending[i])) {
3706 			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3707 			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3708 
3709 			if (WARN_ON(!info->control.vif)) {
3710 				ieee80211_free_txskb(&local->hw, skb);
3711 				continue;
3712 			}
3713 
3714 			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3715 						flags);
3716 
3717 			txok = ieee80211_tx_pending_skb(local, skb);
3718 			spin_lock_irqsave(&local->queue_stop_reason_lock,
3719 					  flags);
3720 			if (!txok)
3721 				break;
3722 		}
3723 
3724 		if (skb_queue_empty(&local->pending[i]))
3725 			ieee80211_propagate_queue_wake(local, i);
3726 	}
3727 	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3728 
3729 	rcu_read_unlock();
3730 }
3731 
3732 /* functions for drivers to get certain frames */
3733 
3734 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3735 				       struct ps_data *ps, struct sk_buff *skb,
3736 				       bool is_template)
3737 {
3738 	u8 *pos, *tim;
3739 	int aid0 = 0;
3740 	int i, have_bits = 0, n1, n2;
3741 
3742 	/* Generate bitmap for TIM only if there are any STAs in power save
3743 	 * mode. */
3744 	if (atomic_read(&ps->num_sta_ps) > 0)
3745 		/* in the hope that this is faster than
3746 		 * checking byte-for-byte */
3747 		have_bits = !bitmap_empty((unsigned long *)ps->tim,
3748 					  IEEE80211_MAX_AID+1);
3749 	if (!is_template) {
3750 		if (ps->dtim_count == 0)
3751 			ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3752 		else
3753 			ps->dtim_count--;
3754 	}
3755 
3756 	tim = pos = (u8 *) skb_put(skb, 6);
3757 	*pos++ = WLAN_EID_TIM;
3758 	*pos++ = 4;
3759 	*pos++ = ps->dtim_count;
3760 	*pos++ = sdata->vif.bss_conf.dtim_period;
3761 
3762 	if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3763 		aid0 = 1;
3764 
3765 	ps->dtim_bc_mc = aid0 == 1;
3766 
3767 	if (have_bits) {
3768 		/* Find largest even number N1 so that bits numbered 1 through
3769 		 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3770 		 * (N2 + 1) x 8 through 2007 are 0. */
3771 		n1 = 0;
3772 		for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
3773 			if (ps->tim[i]) {
3774 				n1 = i & 0xfe;
3775 				break;
3776 			}
3777 		}
3778 		n2 = n1;
3779 		for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3780 			if (ps->tim[i]) {
3781 				n2 = i;
3782 				break;
3783 			}
3784 		}
3785 
3786 		/* Bitmap control */
3787 		*pos++ = n1 | aid0;
3788 		/* Part Virt Bitmap */
3789 		skb_put(skb, n2 - n1);
3790 		memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3791 
3792 		tim[1] = n2 - n1 + 4;
3793 	} else {
3794 		*pos++ = aid0; /* Bitmap control */
3795 		*pos++ = 0; /* Part Virt Bitmap */
3796 	}
3797 }
3798 
3799 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3800 				    struct ps_data *ps, struct sk_buff *skb,
3801 				    bool is_template)
3802 {
3803 	struct ieee80211_local *local = sdata->local;
3804 
3805 	/*
3806 	 * Not very nice, but we want to allow the driver to call
3807 	 * ieee80211_beacon_get() as a response to the set_tim()
3808 	 * callback. That, however, is already invoked under the
3809 	 * sta_lock to guarantee consistent and race-free update
3810 	 * of the tim bitmap in mac80211 and the driver.
3811 	 */
3812 	if (local->tim_in_locked_section) {
3813 		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3814 	} else {
3815 		spin_lock_bh(&local->tim_lock);
3816 		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3817 		spin_unlock_bh(&local->tim_lock);
3818 	}
3819 
3820 	return 0;
3821 }
3822 
3823 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3824 			      struct beacon_data *beacon)
3825 {
3826 	struct probe_resp *resp;
3827 	u8 *beacon_data;
3828 	size_t beacon_data_len;
3829 	int i;
3830 	u8 count = beacon->csa_current_counter;
3831 
3832 	switch (sdata->vif.type) {
3833 	case NL80211_IFTYPE_AP:
3834 		beacon_data = beacon->tail;
3835 		beacon_data_len = beacon->tail_len;
3836 		break;
3837 	case NL80211_IFTYPE_ADHOC:
3838 		beacon_data = beacon->head;
3839 		beacon_data_len = beacon->head_len;
3840 		break;
3841 	case NL80211_IFTYPE_MESH_POINT:
3842 		beacon_data = beacon->head;
3843 		beacon_data_len = beacon->head_len;
3844 		break;
3845 	default:
3846 		return;
3847 	}
3848 
3849 	rcu_read_lock();
3850 	for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
3851 		resp = rcu_dereference(sdata->u.ap.probe_resp);
3852 
3853 		if (beacon->csa_counter_offsets[i]) {
3854 			if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3855 					 beacon_data_len)) {
3856 				rcu_read_unlock();
3857 				return;
3858 			}
3859 
3860 			beacon_data[beacon->csa_counter_offsets[i]] = count;
3861 		}
3862 
3863 		if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3864 			resp->data[resp->csa_counter_offsets[i]] = count;
3865 	}
3866 	rcu_read_unlock();
3867 }
3868 
3869 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3870 {
3871 	beacon->csa_current_counter--;
3872 
3873 	/* the counter should never reach 0 */
3874 	WARN_ON_ONCE(!beacon->csa_current_counter);
3875 
3876 	return beacon->csa_current_counter;
3877 }
3878 
3879 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
3880 {
3881 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3882 	struct beacon_data *beacon = NULL;
3883 	u8 count = 0;
3884 
3885 	rcu_read_lock();
3886 
3887 	if (sdata->vif.type == NL80211_IFTYPE_AP)
3888 		beacon = rcu_dereference(sdata->u.ap.beacon);
3889 	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3890 		beacon = rcu_dereference(sdata->u.ibss.presp);
3891 	else if (ieee80211_vif_is_mesh(&sdata->vif))
3892 		beacon = rcu_dereference(sdata->u.mesh.beacon);
3893 
3894 	if (!beacon)
3895 		goto unlock;
3896 
3897 	count = __ieee80211_csa_update_counter(beacon);
3898 
3899 unlock:
3900 	rcu_read_unlock();
3901 	return count;
3902 }
3903 EXPORT_SYMBOL(ieee80211_csa_update_counter);
3904 
3905 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
3906 {
3907 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3908 	struct beacon_data *beacon = NULL;
3909 	u8 *beacon_data;
3910 	size_t beacon_data_len;
3911 	int ret = false;
3912 
3913 	if (!ieee80211_sdata_running(sdata))
3914 		return false;
3915 
3916 	rcu_read_lock();
3917 	if (vif->type == NL80211_IFTYPE_AP) {
3918 		struct ieee80211_if_ap *ap = &sdata->u.ap;
3919 
3920 		beacon = rcu_dereference(ap->beacon);
3921 		if (WARN_ON(!beacon || !beacon->tail))
3922 			goto out;
3923 		beacon_data = beacon->tail;
3924 		beacon_data_len = beacon->tail_len;
3925 	} else if (vif->type == NL80211_IFTYPE_ADHOC) {
3926 		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3927 
3928 		beacon = rcu_dereference(ifibss->presp);
3929 		if (!beacon)
3930 			goto out;
3931 
3932 		beacon_data = beacon->head;
3933 		beacon_data_len = beacon->head_len;
3934 	} else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
3935 		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3936 
3937 		beacon = rcu_dereference(ifmsh->beacon);
3938 		if (!beacon)
3939 			goto out;
3940 
3941 		beacon_data = beacon->head;
3942 		beacon_data_len = beacon->head_len;
3943 	} else {
3944 		WARN_ON(1);
3945 		goto out;
3946 	}
3947 
3948 	if (!beacon->csa_counter_offsets[0])
3949 		goto out;
3950 
3951 	if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
3952 		goto out;
3953 
3954 	if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
3955 		ret = true;
3956  out:
3957 	rcu_read_unlock();
3958 
3959 	return ret;
3960 }
3961 EXPORT_SYMBOL(ieee80211_csa_is_complete);
3962 
3963 static struct sk_buff *
3964 __ieee80211_beacon_get(struct ieee80211_hw *hw,
3965 		       struct ieee80211_vif *vif,
3966 		       struct ieee80211_mutable_offsets *offs,
3967 		       bool is_template)
3968 {
3969 	struct ieee80211_local *local = hw_to_local(hw);
3970 	struct beacon_data *beacon = NULL;
3971 	struct sk_buff *skb = NULL;
3972 	struct ieee80211_tx_info *info;
3973 	struct ieee80211_sub_if_data *sdata = NULL;
3974 	enum nl80211_band band;
3975 	struct ieee80211_tx_rate_control txrc;
3976 	struct ieee80211_chanctx_conf *chanctx_conf;
3977 	int csa_off_base = 0;
3978 
3979 	rcu_read_lock();
3980 
3981 	sdata = vif_to_sdata(vif);
3982 	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3983 
3984 	if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
3985 		goto out;
3986 
3987 	if (offs)
3988 		memset(offs, 0, sizeof(*offs));
3989 
3990 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
3991 		struct ieee80211_if_ap *ap = &sdata->u.ap;
3992 
3993 		beacon = rcu_dereference(ap->beacon);
3994 		if (beacon) {
3995 			if (beacon->csa_counter_offsets[0]) {
3996 				if (!is_template)
3997 					__ieee80211_csa_update_counter(beacon);
3998 
3999 				ieee80211_set_csa(sdata, beacon);
4000 			}
4001 
4002 			/*
4003 			 * headroom, head length,
4004 			 * tail length and maximum TIM length
4005 			 */
4006 			skb = dev_alloc_skb(local->tx_headroom +
4007 					    beacon->head_len +
4008 					    beacon->tail_len + 256 +
4009 					    local->hw.extra_beacon_tailroom);
4010 			if (!skb)
4011 				goto out;
4012 
4013 			skb_reserve(skb, local->tx_headroom);
4014 			memcpy(skb_put(skb, beacon->head_len), beacon->head,
4015 			       beacon->head_len);
4016 
4017 			ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4018 						 is_template);
4019 
4020 			if (offs) {
4021 				offs->tim_offset = beacon->head_len;
4022 				offs->tim_length = skb->len - beacon->head_len;
4023 
4024 				/* for AP the csa offsets are from tail */
4025 				csa_off_base = skb->len;
4026 			}
4027 
4028 			if (beacon->tail)
4029 				memcpy(skb_put(skb, beacon->tail_len),
4030 				       beacon->tail, beacon->tail_len);
4031 		} else
4032 			goto out;
4033 	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
4034 		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4035 		struct ieee80211_hdr *hdr;
4036 
4037 		beacon = rcu_dereference(ifibss->presp);
4038 		if (!beacon)
4039 			goto out;
4040 
4041 		if (beacon->csa_counter_offsets[0]) {
4042 			if (!is_template)
4043 				__ieee80211_csa_update_counter(beacon);
4044 
4045 			ieee80211_set_csa(sdata, beacon);
4046 		}
4047 
4048 		skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
4049 				    local->hw.extra_beacon_tailroom);
4050 		if (!skb)
4051 			goto out;
4052 		skb_reserve(skb, local->tx_headroom);
4053 		memcpy(skb_put(skb, beacon->head_len), beacon->head,
4054 		       beacon->head_len);
4055 
4056 		hdr = (struct ieee80211_hdr *) skb->data;
4057 		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4058 						 IEEE80211_STYPE_BEACON);
4059 	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4060 		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4061 
4062 		beacon = rcu_dereference(ifmsh->beacon);
4063 		if (!beacon)
4064 			goto out;
4065 
4066 		if (beacon->csa_counter_offsets[0]) {
4067 			if (!is_template)
4068 				/* TODO: For mesh csa_counter is in TU, so
4069 				 * decrementing it by one isn't correct, but
4070 				 * for now we leave it consistent with overall
4071 				 * mac80211's behavior.
4072 				 */
4073 				__ieee80211_csa_update_counter(beacon);
4074 
4075 			ieee80211_set_csa(sdata, beacon);
4076 		}
4077 
4078 		if (ifmsh->sync_ops)
4079 			ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
4080 
4081 		skb = dev_alloc_skb(local->tx_headroom +
4082 				    beacon->head_len +
4083 				    256 + /* TIM IE */
4084 				    beacon->tail_len +
4085 				    local->hw.extra_beacon_tailroom);
4086 		if (!skb)
4087 			goto out;
4088 		skb_reserve(skb, local->tx_headroom);
4089 		memcpy(skb_put(skb, beacon->head_len), beacon->head,
4090 		       beacon->head_len);
4091 		ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4092 
4093 		if (offs) {
4094 			offs->tim_offset = beacon->head_len;
4095 			offs->tim_length = skb->len - beacon->head_len;
4096 		}
4097 
4098 		memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
4099 		       beacon->tail_len);
4100 	} else {
4101 		WARN_ON(1);
4102 		goto out;
4103 	}
4104 
4105 	/* CSA offsets */
4106 	if (offs && beacon) {
4107 		int i;
4108 
4109 		for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
4110 			u16 csa_off = beacon->csa_counter_offsets[i];
4111 
4112 			if (!csa_off)
4113 				continue;
4114 
4115 			offs->csa_counter_offs[i] = csa_off_base + csa_off;
4116 		}
4117 	}
4118 
4119 	band = chanctx_conf->def.chan->band;
4120 
4121 	info = IEEE80211_SKB_CB(skb);
4122 
4123 	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4124 	info->flags |= IEEE80211_TX_CTL_NO_ACK;
4125 	info->band = band;
4126 
4127 	memset(&txrc, 0, sizeof(txrc));
4128 	txrc.hw = hw;
4129 	txrc.sband = local->hw.wiphy->bands[band];
4130 	txrc.bss_conf = &sdata->vif.bss_conf;
4131 	txrc.skb = skb;
4132 	txrc.reported_rate.idx = -1;
4133 	txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
4134 	if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
4135 		txrc.max_rate_idx = -1;
4136 	else
4137 		txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
4138 	txrc.bss = true;
4139 	rate_control_get_rate(sdata, NULL, &txrc);
4140 
4141 	info->control.vif = vif;
4142 
4143 	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4144 			IEEE80211_TX_CTL_ASSIGN_SEQ |
4145 			IEEE80211_TX_CTL_FIRST_FRAGMENT;
4146  out:
4147 	rcu_read_unlock();
4148 	return skb;
4149 
4150 }
4151 
4152 struct sk_buff *
4153 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4154 			      struct ieee80211_vif *vif,
4155 			      struct ieee80211_mutable_offsets *offs)
4156 {
4157 	return __ieee80211_beacon_get(hw, vif, offs, true);
4158 }
4159 EXPORT_SYMBOL(ieee80211_beacon_get_template);
4160 
4161 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4162 					 struct ieee80211_vif *vif,
4163 					 u16 *tim_offset, u16 *tim_length)
4164 {
4165 	struct ieee80211_mutable_offsets offs = {};
4166 	struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
4167 	struct sk_buff *copy;
4168 	struct ieee80211_supported_band *sband;
4169 	int shift;
4170 
4171 	if (!bcn)
4172 		return bcn;
4173 
4174 	if (tim_offset)
4175 		*tim_offset = offs.tim_offset;
4176 
4177 	if (tim_length)
4178 		*tim_length = offs.tim_length;
4179 
4180 	if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4181 	    !hw_to_local(hw)->monitors)
4182 		return bcn;
4183 
4184 	/* send a copy to monitor interfaces */
4185 	copy = skb_copy(bcn, GFP_ATOMIC);
4186 	if (!copy)
4187 		return bcn;
4188 
4189 	shift = ieee80211_vif_get_shift(vif);
4190 	sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))];
4191 	ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4192 
4193 	return bcn;
4194 }
4195 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4196 
4197 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4198 					struct ieee80211_vif *vif)
4199 {
4200 	struct ieee80211_if_ap *ap = NULL;
4201 	struct sk_buff *skb = NULL;
4202 	struct probe_resp *presp = NULL;
4203 	struct ieee80211_hdr *hdr;
4204 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4205 
4206 	if (sdata->vif.type != NL80211_IFTYPE_AP)
4207 		return NULL;
4208 
4209 	rcu_read_lock();
4210 
4211 	ap = &sdata->u.ap;
4212 	presp = rcu_dereference(ap->probe_resp);
4213 	if (!presp)
4214 		goto out;
4215 
4216 	skb = dev_alloc_skb(presp->len);
4217 	if (!skb)
4218 		goto out;
4219 
4220 	memcpy(skb_put(skb, presp->len), presp->data, presp->len);
4221 
4222 	hdr = (struct ieee80211_hdr *) skb->data;
4223 	memset(hdr->addr1, 0, sizeof(hdr->addr1));
4224 
4225 out:
4226 	rcu_read_unlock();
4227 	return skb;
4228 }
4229 EXPORT_SYMBOL(ieee80211_proberesp_get);
4230 
4231 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4232 				     struct ieee80211_vif *vif)
4233 {
4234 	struct ieee80211_sub_if_data *sdata;
4235 	struct ieee80211_if_managed *ifmgd;
4236 	struct ieee80211_pspoll *pspoll;
4237 	struct ieee80211_local *local;
4238 	struct sk_buff *skb;
4239 
4240 	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4241 		return NULL;
4242 
4243 	sdata = vif_to_sdata(vif);
4244 	ifmgd = &sdata->u.mgd;
4245 	local = sdata->local;
4246 
4247 	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4248 	if (!skb)
4249 		return NULL;
4250 
4251 	skb_reserve(skb, local->hw.extra_tx_headroom);
4252 
4253 	pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
4254 	memset(pspoll, 0, sizeof(*pspoll));
4255 	pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4256 					    IEEE80211_STYPE_PSPOLL);
4257 	pspoll->aid = cpu_to_le16(ifmgd->aid);
4258 
4259 	/* aid in PS-Poll has its two MSBs each set to 1 */
4260 	pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4261 
4262 	memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4263 	memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4264 
4265 	return skb;
4266 }
4267 EXPORT_SYMBOL(ieee80211_pspoll_get);
4268 
4269 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4270 				       struct ieee80211_vif *vif)
4271 {
4272 	struct ieee80211_hdr_3addr *nullfunc;
4273 	struct ieee80211_sub_if_data *sdata;
4274 	struct ieee80211_if_managed *ifmgd;
4275 	struct ieee80211_local *local;
4276 	struct sk_buff *skb;
4277 
4278 	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4279 		return NULL;
4280 
4281 	sdata = vif_to_sdata(vif);
4282 	ifmgd = &sdata->u.mgd;
4283 	local = sdata->local;
4284 
4285 	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
4286 	if (!skb)
4287 		return NULL;
4288 
4289 	skb_reserve(skb, local->hw.extra_tx_headroom);
4290 
4291 	nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
4292 							  sizeof(*nullfunc));
4293 	memset(nullfunc, 0, sizeof(*nullfunc));
4294 	nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4295 					      IEEE80211_STYPE_NULLFUNC |
4296 					      IEEE80211_FCTL_TODS);
4297 	memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4298 	memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4299 	memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4300 
4301 	return skb;
4302 }
4303 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4304 
4305 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4306 				       const u8 *src_addr,
4307 				       const u8 *ssid, size_t ssid_len,
4308 				       size_t tailroom)
4309 {
4310 	struct ieee80211_local *local = hw_to_local(hw);
4311 	struct ieee80211_hdr_3addr *hdr;
4312 	struct sk_buff *skb;
4313 	size_t ie_ssid_len;
4314 	u8 *pos;
4315 
4316 	ie_ssid_len = 2 + ssid_len;
4317 
4318 	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4319 			    ie_ssid_len + tailroom);
4320 	if (!skb)
4321 		return NULL;
4322 
4323 	skb_reserve(skb, local->hw.extra_tx_headroom);
4324 
4325 	hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
4326 	memset(hdr, 0, sizeof(*hdr));
4327 	hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4328 					 IEEE80211_STYPE_PROBE_REQ);
4329 	eth_broadcast_addr(hdr->addr1);
4330 	memcpy(hdr->addr2, src_addr, ETH_ALEN);
4331 	eth_broadcast_addr(hdr->addr3);
4332 
4333 	pos = skb_put(skb, ie_ssid_len);
4334 	*pos++ = WLAN_EID_SSID;
4335 	*pos++ = ssid_len;
4336 	if (ssid_len)
4337 		memcpy(pos, ssid, ssid_len);
4338 	pos += ssid_len;
4339 
4340 	return skb;
4341 }
4342 EXPORT_SYMBOL(ieee80211_probereq_get);
4343 
4344 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4345 		       const void *frame, size_t frame_len,
4346 		       const struct ieee80211_tx_info *frame_txctl,
4347 		       struct ieee80211_rts *rts)
4348 {
4349 	const struct ieee80211_hdr *hdr = frame;
4350 
4351 	rts->frame_control =
4352 	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4353 	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4354 					       frame_txctl);
4355 	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4356 	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4357 }
4358 EXPORT_SYMBOL(ieee80211_rts_get);
4359 
4360 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4361 			     const void *frame, size_t frame_len,
4362 			     const struct ieee80211_tx_info *frame_txctl,
4363 			     struct ieee80211_cts *cts)
4364 {
4365 	const struct ieee80211_hdr *hdr = frame;
4366 
4367 	cts->frame_control =
4368 	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4369 	cts->duration = ieee80211_ctstoself_duration(hw, vif,
4370 						     frame_len, frame_txctl);
4371 	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4372 }
4373 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4374 
4375 struct sk_buff *
4376 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4377 			  struct ieee80211_vif *vif)
4378 {
4379 	struct ieee80211_local *local = hw_to_local(hw);
4380 	struct sk_buff *skb = NULL;
4381 	struct ieee80211_tx_data tx;
4382 	struct ieee80211_sub_if_data *sdata;
4383 	struct ps_data *ps;
4384 	struct ieee80211_tx_info *info;
4385 	struct ieee80211_chanctx_conf *chanctx_conf;
4386 
4387 	sdata = vif_to_sdata(vif);
4388 
4389 	rcu_read_lock();
4390 	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4391 
4392 	if (!chanctx_conf)
4393 		goto out;
4394 
4395 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
4396 		struct beacon_data *beacon =
4397 				rcu_dereference(sdata->u.ap.beacon);
4398 
4399 		if (!beacon || !beacon->head)
4400 			goto out;
4401 
4402 		ps = &sdata->u.ap.ps;
4403 	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4404 		ps = &sdata->u.mesh.ps;
4405 	} else {
4406 		goto out;
4407 	}
4408 
4409 	if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4410 		goto out; /* send buffered bc/mc only after DTIM beacon */
4411 
4412 	while (1) {
4413 		skb = skb_dequeue(&ps->bc_buf);
4414 		if (!skb)
4415 			goto out;
4416 		local->total_ps_buffered--;
4417 
4418 		if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4419 			struct ieee80211_hdr *hdr =
4420 				(struct ieee80211_hdr *) skb->data;
4421 			/* more buffered multicast/broadcast frames ==> set
4422 			 * MoreData flag in IEEE 802.11 header to inform PS
4423 			 * STAs */
4424 			hdr->frame_control |=
4425 				cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4426 		}
4427 
4428 		if (sdata->vif.type == NL80211_IFTYPE_AP)
4429 			sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4430 		if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4431 			break;
4432 		ieee80211_free_txskb(hw, skb);
4433 	}
4434 
4435 	info = IEEE80211_SKB_CB(skb);
4436 
4437 	tx.flags |= IEEE80211_TX_PS_BUFFERED;
4438 	info->band = chanctx_conf->def.chan->band;
4439 
4440 	if (invoke_tx_handlers(&tx))
4441 		skb = NULL;
4442  out:
4443 	rcu_read_unlock();
4444 
4445 	return skb;
4446 }
4447 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4448 
4449 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4450 {
4451 	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4452 	struct ieee80211_sub_if_data *sdata = sta->sdata;
4453 	struct ieee80211_local *local = sdata->local;
4454 	int ret;
4455 	u32 queues;
4456 
4457 	lockdep_assert_held(&local->sta_mtx);
4458 
4459 	/* only some cases are supported right now */
4460 	switch (sdata->vif.type) {
4461 	case NL80211_IFTYPE_STATION:
4462 	case NL80211_IFTYPE_AP:
4463 	case NL80211_IFTYPE_AP_VLAN:
4464 		break;
4465 	default:
4466 		WARN_ON(1);
4467 		return -EINVAL;
4468 	}
4469 
4470 	if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4471 		return -EINVAL;
4472 
4473 	if (sta->reserved_tid == tid) {
4474 		ret = 0;
4475 		goto out;
4476 	}
4477 
4478 	if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4479 		sdata_err(sdata, "TID reservation already active\n");
4480 		ret = -EALREADY;
4481 		goto out;
4482 	}
4483 
4484 	ieee80211_stop_vif_queues(sdata->local, sdata,
4485 				  IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4486 
4487 	synchronize_net();
4488 
4489 	/* Tear down BA sessions so we stop aggregating on this TID */
4490 	if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4491 		set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4492 		__ieee80211_stop_tx_ba_session(sta, tid,
4493 					       AGG_STOP_LOCAL_REQUEST);
4494 	}
4495 
4496 	queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4497 	__ieee80211_flush_queues(local, sdata, queues, false);
4498 
4499 	sta->reserved_tid = tid;
4500 
4501 	ieee80211_wake_vif_queues(local, sdata,
4502 				  IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4503 
4504 	if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4505 		clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4506 
4507 	ret = 0;
4508  out:
4509 	return ret;
4510 }
4511 EXPORT_SYMBOL(ieee80211_reserve_tid);
4512 
4513 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4514 {
4515 	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4516 	struct ieee80211_sub_if_data *sdata = sta->sdata;
4517 
4518 	lockdep_assert_held(&sdata->local->sta_mtx);
4519 
4520 	/* only some cases are supported right now */
4521 	switch (sdata->vif.type) {
4522 	case NL80211_IFTYPE_STATION:
4523 	case NL80211_IFTYPE_AP:
4524 	case NL80211_IFTYPE_AP_VLAN:
4525 		break;
4526 	default:
4527 		WARN_ON(1);
4528 		return;
4529 	}
4530 
4531 	if (tid != sta->reserved_tid) {
4532 		sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4533 		return;
4534 	}
4535 
4536 	sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4537 }
4538 EXPORT_SYMBOL(ieee80211_unreserve_tid);
4539 
4540 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4541 				 struct sk_buff *skb, int tid,
4542 				 enum nl80211_band band)
4543 {
4544 	int ac = ieee802_1d_to_ac[tid & 7];
4545 
4546 	skb_reset_mac_header(skb);
4547 	skb_set_queue_mapping(skb, ac);
4548 	skb->priority = tid;
4549 
4550 	skb->dev = sdata->dev;
4551 
4552 	/*
4553 	 * The other path calling ieee80211_xmit is from the tasklet,
4554 	 * and while we can handle concurrent transmissions locking
4555 	 * requirements are that we do not come into tx with bhs on.
4556 	 */
4557 	local_bh_disable();
4558 	IEEE80211_SKB_CB(skb)->band = band;
4559 	ieee80211_xmit(sdata, NULL, skb);
4560 	local_bh_enable();
4561 }
4562