xref: /openbmc/linux/net/mac80211/tx.c (revision 20ff1cb5)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright 2002-2005, Instant802 Networks, Inc.
4  * Copyright 2005-2006, Devicescape Software, Inc.
5  * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
6  * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
7  * Copyright 2013-2014  Intel Mobile Communications GmbH
8  * Copyright (C) 2018 Intel Corporation
9  *
10  * Transmit and frame generation functions.
11  */
12 
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/skbuff.h>
16 #include <linux/if_vlan.h>
17 #include <linux/etherdevice.h>
18 #include <linux/bitmap.h>
19 #include <linux/rcupdate.h>
20 #include <linux/export.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <net/codel.h>
26 #include <net/codel_impl.h>
27 #include <asm/unaligned.h>
28 #include <net/fq_impl.h>
29 
30 #include "ieee80211_i.h"
31 #include "driver-ops.h"
32 #include "led.h"
33 #include "mesh.h"
34 #include "wep.h"
35 #include "wpa.h"
36 #include "wme.h"
37 #include "rate.h"
38 
39 /* misc utils */
40 
41 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
42 {
43 	struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
44 
45 	u64_stats_update_begin(&tstats->syncp);
46 	tstats->tx_packets++;
47 	tstats->tx_bytes += len;
48 	u64_stats_update_end(&tstats->syncp);
49 }
50 
51 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
52 				 struct sk_buff *skb, int group_addr,
53 				 int next_frag_len)
54 {
55 	int rate, mrate, erp, dur, i, shift = 0;
56 	struct ieee80211_rate *txrate;
57 	struct ieee80211_local *local = tx->local;
58 	struct ieee80211_supported_band *sband;
59 	struct ieee80211_hdr *hdr;
60 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
61 	struct ieee80211_chanctx_conf *chanctx_conf;
62 	u32 rate_flags = 0;
63 
64 	/* assume HW handles this */
65 	if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
66 		return 0;
67 
68 	rcu_read_lock();
69 	chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
70 	if (chanctx_conf) {
71 		shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
72 		rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
73 	}
74 	rcu_read_unlock();
75 
76 	/* uh huh? */
77 	if (WARN_ON_ONCE(tx->rate.idx < 0))
78 		return 0;
79 
80 	sband = local->hw.wiphy->bands[info->band];
81 	txrate = &sband->bitrates[tx->rate.idx];
82 
83 	erp = txrate->flags & IEEE80211_RATE_ERP_G;
84 
85 	/*
86 	 * data and mgmt (except PS Poll):
87 	 * - during CFP: 32768
88 	 * - during contention period:
89 	 *   if addr1 is group address: 0
90 	 *   if more fragments = 0 and addr1 is individual address: time to
91 	 *      transmit one ACK plus SIFS
92 	 *   if more fragments = 1 and addr1 is individual address: time to
93 	 *      transmit next fragment plus 2 x ACK plus 3 x SIFS
94 	 *
95 	 * IEEE 802.11, 9.6:
96 	 * - control response frame (CTS or ACK) shall be transmitted using the
97 	 *   same rate as the immediately previous frame in the frame exchange
98 	 *   sequence, if this rate belongs to the PHY mandatory rates, or else
99 	 *   at the highest possible rate belonging to the PHY rates in the
100 	 *   BSSBasicRateSet
101 	 */
102 	hdr = (struct ieee80211_hdr *)skb->data;
103 	if (ieee80211_is_ctl(hdr->frame_control)) {
104 		/* TODO: These control frames are not currently sent by
105 		 * mac80211, but should they be implemented, this function
106 		 * needs to be updated to support duration field calculation.
107 		 *
108 		 * RTS: time needed to transmit pending data/mgmt frame plus
109 		 *    one CTS frame plus one ACK frame plus 3 x SIFS
110 		 * CTS: duration of immediately previous RTS minus time
111 		 *    required to transmit CTS and its SIFS
112 		 * ACK: 0 if immediately previous directed data/mgmt had
113 		 *    more=0, with more=1 duration in ACK frame is duration
114 		 *    from previous frame minus time needed to transmit ACK
115 		 *    and its SIFS
116 		 * PS Poll: BIT(15) | BIT(14) | aid
117 		 */
118 		return 0;
119 	}
120 
121 	/* data/mgmt */
122 	if (0 /* FIX: data/mgmt during CFP */)
123 		return cpu_to_le16(32768);
124 
125 	if (group_addr) /* Group address as the destination - no ACK */
126 		return 0;
127 
128 	/* Individual destination address:
129 	 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
130 	 * CTS and ACK frames shall be transmitted using the highest rate in
131 	 * basic rate set that is less than or equal to the rate of the
132 	 * immediately previous frame and that is using the same modulation
133 	 * (CCK or OFDM). If no basic rate set matches with these requirements,
134 	 * the highest mandatory rate of the PHY that is less than or equal to
135 	 * the rate of the previous frame is used.
136 	 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
137 	 */
138 	rate = -1;
139 	/* use lowest available if everything fails */
140 	mrate = sband->bitrates[0].bitrate;
141 	for (i = 0; i < sband->n_bitrates; i++) {
142 		struct ieee80211_rate *r = &sband->bitrates[i];
143 
144 		if (r->bitrate > txrate->bitrate)
145 			break;
146 
147 		if ((rate_flags & r->flags) != rate_flags)
148 			continue;
149 
150 		if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
151 			rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
152 
153 		switch (sband->band) {
154 		case NL80211_BAND_2GHZ: {
155 			u32 flag;
156 			if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
157 				flag = IEEE80211_RATE_MANDATORY_G;
158 			else
159 				flag = IEEE80211_RATE_MANDATORY_B;
160 			if (r->flags & flag)
161 				mrate = r->bitrate;
162 			break;
163 		}
164 		case NL80211_BAND_5GHZ:
165 		case NL80211_BAND_6GHZ:
166 			if (r->flags & IEEE80211_RATE_MANDATORY_A)
167 				mrate = r->bitrate;
168 			break;
169 		case NL80211_BAND_60GHZ:
170 			/* TODO, for now fall through */
171 		case NUM_NL80211_BANDS:
172 			WARN_ON(1);
173 			break;
174 		}
175 	}
176 	if (rate == -1) {
177 		/* No matching basic rate found; use highest suitable mandatory
178 		 * PHY rate */
179 		rate = DIV_ROUND_UP(mrate, 1 << shift);
180 	}
181 
182 	/* Don't calculate ACKs for QoS Frames with NoAck Policy set */
183 	if (ieee80211_is_data_qos(hdr->frame_control) &&
184 	    *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
185 		dur = 0;
186 	else
187 		/* Time needed to transmit ACK
188 		 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
189 		 * to closest integer */
190 		dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
191 				tx->sdata->vif.bss_conf.use_short_preamble,
192 				shift);
193 
194 	if (next_frag_len) {
195 		/* Frame is fragmented: duration increases with time needed to
196 		 * transmit next fragment plus ACK and 2 x SIFS. */
197 		dur *= 2; /* ACK + SIFS */
198 		/* next fragment */
199 		dur += ieee80211_frame_duration(sband->band, next_frag_len,
200 				txrate->bitrate, erp,
201 				tx->sdata->vif.bss_conf.use_short_preamble,
202 				shift);
203 	}
204 
205 	return cpu_to_le16(dur);
206 }
207 
208 /* tx handlers */
209 static ieee80211_tx_result debug_noinline
210 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
211 {
212 	struct ieee80211_local *local = tx->local;
213 	struct ieee80211_if_managed *ifmgd;
214 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
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 	if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK))
244 		return TX_CONTINUE;
245 
246 	ifmgd = &tx->sdata->u.mgd;
247 
248 	/*
249 	 * Don't wakeup from power save if u-apsd is enabled, voip ac has
250 	 * u-apsd enabled and the frame is in voip class. This effectively
251 	 * means that even if all access categories have u-apsd enabled, in
252 	 * practise u-apsd is only used with the voip ac. This is a
253 	 * workaround for the case when received voip class packets do not
254 	 * have correct qos tag for some reason, due the network or the
255 	 * peer application.
256 	 *
257 	 * Note: ifmgd->uapsd_queues access is racy here. If the value is
258 	 * changed via debugfs, user needs to reassociate manually to have
259 	 * everything in sync.
260 	 */
261 	if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
262 	    (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
263 	    skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
264 		return TX_CONTINUE;
265 
266 	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
267 		ieee80211_stop_queues_by_reason(&local->hw,
268 						IEEE80211_MAX_QUEUE_MAP,
269 						IEEE80211_QUEUE_STOP_REASON_PS,
270 						false);
271 		ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
272 		ieee80211_queue_work(&local->hw,
273 				     &local->dynamic_ps_disable_work);
274 	}
275 
276 	/* Don't restart the timer if we're not disassociated */
277 	if (!ifmgd->associated)
278 		return TX_CONTINUE;
279 
280 	mod_timer(&local->dynamic_ps_timer, jiffies +
281 		  msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
282 
283 	return TX_CONTINUE;
284 }
285 
286 static ieee80211_tx_result debug_noinline
287 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
288 {
289 
290 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
291 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
292 	bool assoc = false;
293 
294 	if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
295 		return TX_CONTINUE;
296 
297 	if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
298 	    test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
299 	    !ieee80211_is_probe_req(hdr->frame_control) &&
300 	    !ieee80211_is_nullfunc(hdr->frame_control))
301 		/*
302 		 * When software scanning only nullfunc frames (to notify
303 		 * the sleep state to the AP) and probe requests (for the
304 		 * active scan) are allowed, all other frames should not be
305 		 * sent and we should not get here, but if we do
306 		 * nonetheless, drop them to avoid sending them
307 		 * off-channel. See the link below and
308 		 * ieee80211_start_scan() for more.
309 		 *
310 		 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
311 		 */
312 		return TX_DROP;
313 
314 	if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
315 		return TX_CONTINUE;
316 
317 	if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
318 		return TX_CONTINUE;
319 
320 	if (tx->flags & IEEE80211_TX_PS_BUFFERED)
321 		return TX_CONTINUE;
322 
323 	if (tx->sta)
324 		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
325 
326 	if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
327 		if (unlikely(!assoc &&
328 			     ieee80211_is_data(hdr->frame_control))) {
329 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
330 			sdata_info(tx->sdata,
331 				   "dropped data frame to not associated station %pM\n",
332 				   hdr->addr1);
333 #endif
334 			I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
335 			return TX_DROP;
336 		}
337 	} else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
338 			    ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
339 		/*
340 		 * No associated STAs - no need to send multicast
341 		 * frames.
342 		 */
343 		return TX_DROP;
344 	}
345 
346 	return TX_CONTINUE;
347 }
348 
349 /* This function is called whenever the AP is about to exceed the maximum limit
350  * of buffered frames for power saving STAs. This situation should not really
351  * happen often during normal operation, so dropping the oldest buffered packet
352  * from each queue should be OK to make some room for new frames. */
353 static void purge_old_ps_buffers(struct ieee80211_local *local)
354 {
355 	int total = 0, purged = 0;
356 	struct sk_buff *skb;
357 	struct ieee80211_sub_if_data *sdata;
358 	struct sta_info *sta;
359 
360 	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
361 		struct ps_data *ps;
362 
363 		if (sdata->vif.type == NL80211_IFTYPE_AP)
364 			ps = &sdata->u.ap.ps;
365 		else if (ieee80211_vif_is_mesh(&sdata->vif))
366 			ps = &sdata->u.mesh.ps;
367 		else
368 			continue;
369 
370 		skb = skb_dequeue(&ps->bc_buf);
371 		if (skb) {
372 			purged++;
373 			ieee80211_free_txskb(&local->hw, skb);
374 		}
375 		total += skb_queue_len(&ps->bc_buf);
376 	}
377 
378 	/*
379 	 * Drop one frame from each station from the lowest-priority
380 	 * AC that has frames at all.
381 	 */
382 	list_for_each_entry_rcu(sta, &local->sta_list, list) {
383 		int ac;
384 
385 		for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
386 			skb = skb_dequeue(&sta->ps_tx_buf[ac]);
387 			total += skb_queue_len(&sta->ps_tx_buf[ac]);
388 			if (skb) {
389 				purged++;
390 				ieee80211_free_txskb(&local->hw, skb);
391 				break;
392 			}
393 		}
394 	}
395 
396 	local->total_ps_buffered = total;
397 	ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
398 }
399 
400 static ieee80211_tx_result
401 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
402 {
403 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
404 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
405 	struct ps_data *ps;
406 
407 	/*
408 	 * broadcast/multicast frame
409 	 *
410 	 * If any of the associated/peer stations is in power save mode,
411 	 * the frame is buffered to be sent after DTIM beacon frame.
412 	 * This is done either by the hardware or us.
413 	 */
414 
415 	/* powersaving STAs currently only in AP/VLAN/mesh mode */
416 	if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
417 	    tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
418 		if (!tx->sdata->bss)
419 			return TX_CONTINUE;
420 
421 		ps = &tx->sdata->bss->ps;
422 	} else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
423 		ps = &tx->sdata->u.mesh.ps;
424 	} else {
425 		return TX_CONTINUE;
426 	}
427 
428 
429 	/* no buffering for ordered frames */
430 	if (ieee80211_has_order(hdr->frame_control))
431 		return TX_CONTINUE;
432 
433 	if (ieee80211_is_probe_req(hdr->frame_control))
434 		return TX_CONTINUE;
435 
436 	if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
437 		info->hw_queue = tx->sdata->vif.cab_queue;
438 
439 	/* no stations in PS mode and no buffered packets */
440 	if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf))
441 		return TX_CONTINUE;
442 
443 	info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
444 
445 	/* device releases frame after DTIM beacon */
446 	if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
447 		return TX_CONTINUE;
448 
449 	/* buffered in mac80211 */
450 	if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
451 		purge_old_ps_buffers(tx->local);
452 
453 	if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
454 		ps_dbg(tx->sdata,
455 		       "BC TX buffer full - dropping the oldest frame\n");
456 		ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
457 	} else
458 		tx->local->total_ps_buffered++;
459 
460 	skb_queue_tail(&ps->bc_buf, tx->skb);
461 
462 	return TX_QUEUED;
463 }
464 
465 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
466 			     struct sk_buff *skb)
467 {
468 	if (!ieee80211_is_mgmt(fc))
469 		return 0;
470 
471 	if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
472 		return 0;
473 
474 	if (!ieee80211_is_robust_mgmt_frame(skb))
475 		return 0;
476 
477 	return 1;
478 }
479 
480 static ieee80211_tx_result
481 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
482 {
483 	struct sta_info *sta = tx->sta;
484 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
485 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
486 	struct ieee80211_local *local = tx->local;
487 
488 	if (unlikely(!sta))
489 		return TX_CONTINUE;
490 
491 	if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
492 		      test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
493 		      test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
494 		     !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
495 		int ac = skb_get_queue_mapping(tx->skb);
496 
497 		if (ieee80211_is_mgmt(hdr->frame_control) &&
498 		    !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
499 			info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
500 			return TX_CONTINUE;
501 		}
502 
503 		ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
504 		       sta->sta.addr, sta->sta.aid, ac);
505 		if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
506 			purge_old_ps_buffers(tx->local);
507 
508 		/* sync with ieee80211_sta_ps_deliver_wakeup */
509 		spin_lock(&sta->ps_lock);
510 		/*
511 		 * STA woke up the meantime and all the frames on ps_tx_buf have
512 		 * been queued to pending queue. No reordering can happen, go
513 		 * ahead and Tx the packet.
514 		 */
515 		if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
516 		    !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
517 		    !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
518 			spin_unlock(&sta->ps_lock);
519 			return TX_CONTINUE;
520 		}
521 
522 		if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
523 			struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
524 			ps_dbg(tx->sdata,
525 			       "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
526 			       sta->sta.addr, ac);
527 			ieee80211_free_txskb(&local->hw, old);
528 		} else
529 			tx->local->total_ps_buffered++;
530 
531 		info->control.jiffies = jiffies;
532 		info->control.vif = &tx->sdata->vif;
533 		info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
534 		info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
535 		skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
536 		spin_unlock(&sta->ps_lock);
537 
538 		if (!timer_pending(&local->sta_cleanup))
539 			mod_timer(&local->sta_cleanup,
540 				  round_jiffies(jiffies +
541 						STA_INFO_CLEANUP_INTERVAL));
542 
543 		/*
544 		 * We queued up some frames, so the TIM bit might
545 		 * need to be set, recalculate it.
546 		 */
547 		sta_info_recalc_tim(sta);
548 
549 		return TX_QUEUED;
550 	} else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
551 		ps_dbg(tx->sdata,
552 		       "STA %pM in PS mode, but polling/in SP -> send frame\n",
553 		       sta->sta.addr);
554 	}
555 
556 	return TX_CONTINUE;
557 }
558 
559 static ieee80211_tx_result debug_noinline
560 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
561 {
562 	if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
563 		return TX_CONTINUE;
564 
565 	if (tx->flags & IEEE80211_TX_UNICAST)
566 		return ieee80211_tx_h_unicast_ps_buf(tx);
567 	else
568 		return ieee80211_tx_h_multicast_ps_buf(tx);
569 }
570 
571 static ieee80211_tx_result debug_noinline
572 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
573 {
574 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
575 
576 	if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
577 		if (tx->sdata->control_port_no_encrypt)
578 			info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
579 		info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
580 		info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
581 	}
582 
583 	return TX_CONTINUE;
584 }
585 
586 static ieee80211_tx_result debug_noinline
587 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
588 {
589 	struct ieee80211_key *key;
590 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
591 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
592 
593 	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
594 		tx->key = NULL;
595 	else if (tx->sta &&
596 		 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
597 		tx->key = key;
598 	else if (ieee80211_is_group_privacy_action(tx->skb) &&
599 		(key = rcu_dereference(tx->sdata->default_multicast_key)))
600 		tx->key = key;
601 	else if (ieee80211_is_mgmt(hdr->frame_control) &&
602 		 is_multicast_ether_addr(hdr->addr1) &&
603 		 ieee80211_is_robust_mgmt_frame(tx->skb) &&
604 		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
605 		tx->key = key;
606 	else if (is_multicast_ether_addr(hdr->addr1) &&
607 		 (key = rcu_dereference(tx->sdata->default_multicast_key)))
608 		tx->key = key;
609 	else if (!is_multicast_ether_addr(hdr->addr1) &&
610 		 (key = rcu_dereference(tx->sdata->default_unicast_key)))
611 		tx->key = key;
612 	else
613 		tx->key = NULL;
614 
615 	if (tx->key) {
616 		bool skip_hw = false;
617 
618 		/* TODO: add threshold stuff again */
619 
620 		switch (tx->key->conf.cipher) {
621 		case WLAN_CIPHER_SUITE_WEP40:
622 		case WLAN_CIPHER_SUITE_WEP104:
623 		case WLAN_CIPHER_SUITE_TKIP:
624 			if (!ieee80211_is_data_present(hdr->frame_control))
625 				tx->key = NULL;
626 			break;
627 		case WLAN_CIPHER_SUITE_CCMP:
628 		case WLAN_CIPHER_SUITE_CCMP_256:
629 		case WLAN_CIPHER_SUITE_GCMP:
630 		case WLAN_CIPHER_SUITE_GCMP_256:
631 			if (!ieee80211_is_data_present(hdr->frame_control) &&
632 			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
633 					       tx->skb) &&
634 			    !ieee80211_is_group_privacy_action(tx->skb))
635 				tx->key = NULL;
636 			else
637 				skip_hw = (tx->key->conf.flags &
638 					   IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
639 					ieee80211_is_mgmt(hdr->frame_control);
640 			break;
641 		case WLAN_CIPHER_SUITE_AES_CMAC:
642 		case WLAN_CIPHER_SUITE_BIP_CMAC_256:
643 		case WLAN_CIPHER_SUITE_BIP_GMAC_128:
644 		case WLAN_CIPHER_SUITE_BIP_GMAC_256:
645 			if (!ieee80211_is_mgmt(hdr->frame_control))
646 				tx->key = NULL;
647 			break;
648 		}
649 
650 		if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
651 			     !ieee80211_is_deauth(hdr->frame_control)))
652 			return TX_DROP;
653 
654 		if (!skip_hw && tx->key &&
655 		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
656 			info->control.hw_key = &tx->key->conf;
657 	}
658 
659 	return TX_CONTINUE;
660 }
661 
662 static ieee80211_tx_result debug_noinline
663 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
664 {
665 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
666 	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
667 	struct ieee80211_supported_band *sband;
668 	u32 len;
669 	struct ieee80211_tx_rate_control txrc;
670 	struct ieee80211_sta_rates *ratetbl = NULL;
671 	bool assoc = false;
672 
673 	memset(&txrc, 0, sizeof(txrc));
674 
675 	sband = tx->local->hw.wiphy->bands[info->band];
676 
677 	len = min_t(u32, tx->skb->len + FCS_LEN,
678 			 tx->local->hw.wiphy->frag_threshold);
679 
680 	/* set up the tx rate control struct we give the RC algo */
681 	txrc.hw = &tx->local->hw;
682 	txrc.sband = sband;
683 	txrc.bss_conf = &tx->sdata->vif.bss_conf;
684 	txrc.skb = tx->skb;
685 	txrc.reported_rate.idx = -1;
686 	txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
687 
688 	if (tx->sdata->rc_has_mcs_mask[info->band])
689 		txrc.rate_idx_mcs_mask =
690 			tx->sdata->rc_rateidx_mcs_mask[info->band];
691 
692 	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
693 		    tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
694 		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
695 		    tx->sdata->vif.type == NL80211_IFTYPE_OCB);
696 
697 	/* set up RTS protection if desired */
698 	if (len > tx->local->hw.wiphy->rts_threshold) {
699 		txrc.rts = true;
700 	}
701 
702 	info->control.use_rts = txrc.rts;
703 	info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
704 
705 	/*
706 	 * Use short preamble if the BSS can handle it, but not for
707 	 * management frames unless we know the receiver can handle
708 	 * that -- the management frame might be to a station that
709 	 * just wants a probe response.
710 	 */
711 	if (tx->sdata->vif.bss_conf.use_short_preamble &&
712 	    (ieee80211_is_data(hdr->frame_control) ||
713 	     (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
714 		txrc.short_preamble = true;
715 
716 	info->control.short_preamble = txrc.short_preamble;
717 
718 	/* don't ask rate control when rate already injected via radiotap */
719 	if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
720 		return TX_CONTINUE;
721 
722 	if (tx->sta)
723 		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
724 
725 	/*
726 	 * Lets not bother rate control if we're associated and cannot
727 	 * talk to the sta. This should not happen.
728 	 */
729 	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
730 		 !rate_usable_index_exists(sband, &tx->sta->sta),
731 		 "%s: Dropped data frame as no usable bitrate found while "
732 		 "scanning and associated. Target station: "
733 		 "%pM on %d GHz band\n",
734 		 tx->sdata->name, hdr->addr1,
735 		 info->band ? 5 : 2))
736 		return TX_DROP;
737 
738 	/*
739 	 * If we're associated with the sta at this point we know we can at
740 	 * least send the frame at the lowest bit rate.
741 	 */
742 	rate_control_get_rate(tx->sdata, tx->sta, &txrc);
743 
744 	if (tx->sta && !info->control.skip_table)
745 		ratetbl = rcu_dereference(tx->sta->sta.rates);
746 
747 	if (unlikely(info->control.rates[0].idx < 0)) {
748 		if (ratetbl) {
749 			struct ieee80211_tx_rate rate = {
750 				.idx = ratetbl->rate[0].idx,
751 				.flags = ratetbl->rate[0].flags,
752 				.count = ratetbl->rate[0].count
753 			};
754 
755 			if (ratetbl->rate[0].idx < 0)
756 				return TX_DROP;
757 
758 			tx->rate = rate;
759 		} else {
760 			return TX_DROP;
761 		}
762 	} else {
763 		tx->rate = info->control.rates[0];
764 	}
765 
766 	if (txrc.reported_rate.idx < 0) {
767 		txrc.reported_rate = tx->rate;
768 		if (tx->sta && ieee80211_is_data(hdr->frame_control))
769 			tx->sta->tx_stats.last_rate = txrc.reported_rate;
770 	} else if (tx->sta)
771 		tx->sta->tx_stats.last_rate = txrc.reported_rate;
772 
773 	if (ratetbl)
774 		return TX_CONTINUE;
775 
776 	if (unlikely(!info->control.rates[0].count))
777 		info->control.rates[0].count = 1;
778 
779 	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
780 			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
781 		info->control.rates[0].count = 1;
782 
783 	return TX_CONTINUE;
784 }
785 
786 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
787 {
788 	u16 *seq = &sta->tid_seq[tid];
789 	__le16 ret = cpu_to_le16(*seq);
790 
791 	/* Increase the sequence number. */
792 	*seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
793 
794 	return ret;
795 }
796 
797 static ieee80211_tx_result debug_noinline
798 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
799 {
800 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
801 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
802 	int tid;
803 
804 	/*
805 	 * Packet injection may want to control the sequence
806 	 * number, if we have no matching interface then we
807 	 * neither assign one ourselves nor ask the driver to.
808 	 */
809 	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
810 		return TX_CONTINUE;
811 
812 	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
813 		return TX_CONTINUE;
814 
815 	if (ieee80211_hdrlen(hdr->frame_control) < 24)
816 		return TX_CONTINUE;
817 
818 	if (ieee80211_is_qos_nullfunc(hdr->frame_control))
819 		return TX_CONTINUE;
820 
821 	/*
822 	 * Anything but QoS data that has a sequence number field
823 	 * (is long enough) gets a sequence number from the global
824 	 * counter.  QoS data frames with a multicast destination
825 	 * also use the global counter (802.11-2012 9.3.2.10).
826 	 */
827 	if (!ieee80211_is_data_qos(hdr->frame_control) ||
828 	    is_multicast_ether_addr(hdr->addr1)) {
829 		if (tx->flags & IEEE80211_TX_NO_SEQNO)
830 			return TX_CONTINUE;
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 	tid = ieee80211_get_tid(hdr);
851 	tx->sta->tx_stats.msdu[tid]++;
852 
853 	hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
854 
855 	return TX_CONTINUE;
856 }
857 
858 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
859 			      struct sk_buff *skb, int hdrlen,
860 			      int frag_threshold)
861 {
862 	struct ieee80211_local *local = tx->local;
863 	struct ieee80211_tx_info *info;
864 	struct sk_buff *tmp;
865 	int per_fragm = frag_threshold - hdrlen - FCS_LEN;
866 	int pos = hdrlen + per_fragm;
867 	int rem = skb->len - hdrlen - per_fragm;
868 
869 	if (WARN_ON(rem < 0))
870 		return -EINVAL;
871 
872 	/* first fragment was already added to queue by caller */
873 
874 	while (rem) {
875 		int fraglen = per_fragm;
876 
877 		if (fraglen > rem)
878 			fraglen = rem;
879 		rem -= fraglen;
880 		tmp = dev_alloc_skb(local->tx_headroom +
881 				    frag_threshold +
882 				    tx->sdata->encrypt_headroom +
883 				    IEEE80211_ENCRYPT_TAILROOM);
884 		if (!tmp)
885 			return -ENOMEM;
886 
887 		__skb_queue_tail(&tx->skbs, tmp);
888 
889 		skb_reserve(tmp,
890 			    local->tx_headroom + tx->sdata->encrypt_headroom);
891 
892 		/* copy control information */
893 		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
894 
895 		info = IEEE80211_SKB_CB(tmp);
896 		info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
897 				 IEEE80211_TX_CTL_FIRST_FRAGMENT);
898 
899 		if (rem)
900 			info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
901 
902 		skb_copy_queue_mapping(tmp, skb);
903 		tmp->priority = skb->priority;
904 		tmp->dev = skb->dev;
905 
906 		/* copy header and data */
907 		skb_put_data(tmp, skb->data, hdrlen);
908 		skb_put_data(tmp, skb->data + pos, fraglen);
909 
910 		pos += fraglen;
911 	}
912 
913 	/* adjust first fragment's length */
914 	skb_trim(skb, hdrlen + per_fragm);
915 	return 0;
916 }
917 
918 static ieee80211_tx_result debug_noinline
919 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
920 {
921 	struct sk_buff *skb = tx->skb;
922 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
923 	struct ieee80211_hdr *hdr = (void *)skb->data;
924 	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
925 	int hdrlen;
926 	int fragnum;
927 
928 	/* no matter what happens, tx->skb moves to tx->skbs */
929 	__skb_queue_tail(&tx->skbs, skb);
930 	tx->skb = NULL;
931 
932 	if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
933 		return TX_CONTINUE;
934 
935 	if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
936 		return TX_CONTINUE;
937 
938 	/*
939 	 * Warn when submitting a fragmented A-MPDU frame and drop it.
940 	 * This scenario is handled in ieee80211_tx_prepare but extra
941 	 * caution taken here as fragmented ampdu may cause Tx stop.
942 	 */
943 	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
944 		return TX_DROP;
945 
946 	hdrlen = ieee80211_hdrlen(hdr->frame_control);
947 
948 	/* internal error, why isn't DONTFRAG set? */
949 	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
950 		return TX_DROP;
951 
952 	/*
953 	 * Now fragment the frame. This will allocate all the fragments and
954 	 * chain them (using skb as the first fragment) to skb->next.
955 	 * During transmission, we will remove the successfully transmitted
956 	 * fragments from this list. When the low-level driver rejects one
957 	 * of the fragments then we will simply pretend to accept the skb
958 	 * but store it away as pending.
959 	 */
960 	if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
961 		return TX_DROP;
962 
963 	/* update duration/seq/flags of fragments */
964 	fragnum = 0;
965 
966 	skb_queue_walk(&tx->skbs, skb) {
967 		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
968 
969 		hdr = (void *)skb->data;
970 		info = IEEE80211_SKB_CB(skb);
971 
972 		if (!skb_queue_is_last(&tx->skbs, skb)) {
973 			hdr->frame_control |= morefrags;
974 			/*
975 			 * No multi-rate retries for fragmented frames, that
976 			 * would completely throw off the NAV at other STAs.
977 			 */
978 			info->control.rates[1].idx = -1;
979 			info->control.rates[2].idx = -1;
980 			info->control.rates[3].idx = -1;
981 			BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
982 			info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
983 		} else {
984 			hdr->frame_control &= ~morefrags;
985 		}
986 		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
987 		fragnum++;
988 	}
989 
990 	return TX_CONTINUE;
991 }
992 
993 static ieee80211_tx_result debug_noinline
994 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
995 {
996 	struct sk_buff *skb;
997 	int ac = -1;
998 
999 	if (!tx->sta)
1000 		return TX_CONTINUE;
1001 
1002 	skb_queue_walk(&tx->skbs, skb) {
1003 		ac = skb_get_queue_mapping(skb);
1004 		tx->sta->tx_stats.bytes[ac] += skb->len;
1005 	}
1006 	if (ac >= 0)
1007 		tx->sta->tx_stats.packets[ac]++;
1008 
1009 	return TX_CONTINUE;
1010 }
1011 
1012 static ieee80211_tx_result debug_noinline
1013 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1014 {
1015 	if (!tx->key)
1016 		return TX_CONTINUE;
1017 
1018 	switch (tx->key->conf.cipher) {
1019 	case WLAN_CIPHER_SUITE_WEP40:
1020 	case WLAN_CIPHER_SUITE_WEP104:
1021 		return ieee80211_crypto_wep_encrypt(tx);
1022 	case WLAN_CIPHER_SUITE_TKIP:
1023 		return ieee80211_crypto_tkip_encrypt(tx);
1024 	case WLAN_CIPHER_SUITE_CCMP:
1025 		return ieee80211_crypto_ccmp_encrypt(
1026 			tx, IEEE80211_CCMP_MIC_LEN);
1027 	case WLAN_CIPHER_SUITE_CCMP_256:
1028 		return ieee80211_crypto_ccmp_encrypt(
1029 			tx, IEEE80211_CCMP_256_MIC_LEN);
1030 	case WLAN_CIPHER_SUITE_AES_CMAC:
1031 		return ieee80211_crypto_aes_cmac_encrypt(tx);
1032 	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1033 		return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1034 	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1035 	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1036 		return ieee80211_crypto_aes_gmac_encrypt(tx);
1037 	case WLAN_CIPHER_SUITE_GCMP:
1038 	case WLAN_CIPHER_SUITE_GCMP_256:
1039 		return ieee80211_crypto_gcmp_encrypt(tx);
1040 	default:
1041 		return ieee80211_crypto_hw_encrypt(tx);
1042 	}
1043 
1044 	return TX_DROP;
1045 }
1046 
1047 static ieee80211_tx_result debug_noinline
1048 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1049 {
1050 	struct sk_buff *skb;
1051 	struct ieee80211_hdr *hdr;
1052 	int next_len;
1053 	bool group_addr;
1054 
1055 	skb_queue_walk(&tx->skbs, skb) {
1056 		hdr = (void *) skb->data;
1057 		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1058 			break; /* must not overwrite AID */
1059 		if (!skb_queue_is_last(&tx->skbs, skb)) {
1060 			struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1061 			next_len = next->len;
1062 		} else
1063 			next_len = 0;
1064 		group_addr = is_multicast_ether_addr(hdr->addr1);
1065 
1066 		hdr->duration_id =
1067 			ieee80211_duration(tx, skb, group_addr, next_len);
1068 	}
1069 
1070 	return TX_CONTINUE;
1071 }
1072 
1073 /* actual transmit path */
1074 
1075 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1076 				  struct sk_buff *skb,
1077 				  struct ieee80211_tx_info *info,
1078 				  struct tid_ampdu_tx *tid_tx,
1079 				  int tid)
1080 {
1081 	bool queued = false;
1082 	bool reset_agg_timer = false;
1083 	struct sk_buff *purge_skb = NULL;
1084 
1085 	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1086 		info->flags |= IEEE80211_TX_CTL_AMPDU;
1087 		reset_agg_timer = true;
1088 	} else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1089 		/*
1090 		 * nothing -- this aggregation session is being started
1091 		 * but that might still fail with the driver
1092 		 */
1093 	} else if (!tx->sta->sta.txq[tid]) {
1094 		spin_lock(&tx->sta->lock);
1095 		/*
1096 		 * Need to re-check now, because we may get here
1097 		 *
1098 		 *  1) in the window during which the setup is actually
1099 		 *     already done, but not marked yet because not all
1100 		 *     packets are spliced over to the driver pending
1101 		 *     queue yet -- if this happened we acquire the lock
1102 		 *     either before or after the splice happens, but
1103 		 *     need to recheck which of these cases happened.
1104 		 *
1105 		 *  2) during session teardown, if the OPERATIONAL bit
1106 		 *     was cleared due to the teardown but the pointer
1107 		 *     hasn't been assigned NULL yet (or we loaded it
1108 		 *     before it was assigned) -- in this case it may
1109 		 *     now be NULL which means we should just let the
1110 		 *     packet pass through because splicing the frames
1111 		 *     back is already done.
1112 		 */
1113 		tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1114 
1115 		if (!tid_tx) {
1116 			/* do nothing, let packet pass through */
1117 		} else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1118 			info->flags |= IEEE80211_TX_CTL_AMPDU;
1119 			reset_agg_timer = true;
1120 		} else {
1121 			queued = true;
1122 			if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1123 				clear_sta_flag(tx->sta, WLAN_STA_SP);
1124 				ps_dbg(tx->sta->sdata,
1125 				       "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1126 				       tx->sta->sta.addr, tx->sta->sta.aid);
1127 			}
1128 			info->control.vif = &tx->sdata->vif;
1129 			info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1130 			info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1131 			__skb_queue_tail(&tid_tx->pending, skb);
1132 			if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1133 				purge_skb = __skb_dequeue(&tid_tx->pending);
1134 		}
1135 		spin_unlock(&tx->sta->lock);
1136 
1137 		if (purge_skb)
1138 			ieee80211_free_txskb(&tx->local->hw, purge_skb);
1139 	}
1140 
1141 	/* reset session timer */
1142 	if (reset_agg_timer)
1143 		tid_tx->last_tx = jiffies;
1144 
1145 	return queued;
1146 }
1147 
1148 /*
1149  * initialises @tx
1150  * pass %NULL for the station if unknown, a valid pointer if known
1151  * or an ERR_PTR() if the station is known not to exist
1152  */
1153 static ieee80211_tx_result
1154 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1155 		     struct ieee80211_tx_data *tx,
1156 		     struct sta_info *sta, struct sk_buff *skb)
1157 {
1158 	struct ieee80211_local *local = sdata->local;
1159 	struct ieee80211_hdr *hdr;
1160 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1161 	int tid;
1162 
1163 	memset(tx, 0, sizeof(*tx));
1164 	tx->skb = skb;
1165 	tx->local = local;
1166 	tx->sdata = sdata;
1167 	__skb_queue_head_init(&tx->skbs);
1168 
1169 	/*
1170 	 * If this flag is set to true anywhere, and we get here,
1171 	 * we are doing the needed processing, so remove the flag
1172 	 * now.
1173 	 */
1174 	info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1175 
1176 	hdr = (struct ieee80211_hdr *) skb->data;
1177 
1178 	if (likely(sta)) {
1179 		if (!IS_ERR(sta))
1180 			tx->sta = sta;
1181 	} else {
1182 		if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1183 			tx->sta = rcu_dereference(sdata->u.vlan.sta);
1184 			if (!tx->sta && sdata->wdev.use_4addr)
1185 				return TX_DROP;
1186 		} else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1187 					  IEEE80211_TX_CTL_INJECTED) ||
1188 			   tx->sdata->control_port_protocol == tx->skb->protocol) {
1189 			tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1190 		}
1191 		if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1192 			tx->sta = sta_info_get(sdata, hdr->addr1);
1193 	}
1194 
1195 	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1196 	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1197 	    ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1198 	    !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1199 		struct tid_ampdu_tx *tid_tx;
1200 
1201 		tid = ieee80211_get_tid(hdr);
1202 
1203 		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1204 		if (tid_tx) {
1205 			bool queued;
1206 
1207 			queued = ieee80211_tx_prep_agg(tx, skb, info,
1208 						       tid_tx, tid);
1209 
1210 			if (unlikely(queued))
1211 				return TX_QUEUED;
1212 		}
1213 	}
1214 
1215 	if (is_multicast_ether_addr(hdr->addr1)) {
1216 		tx->flags &= ~IEEE80211_TX_UNICAST;
1217 		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1218 	} else
1219 		tx->flags |= IEEE80211_TX_UNICAST;
1220 
1221 	if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1222 		if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1223 		    skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1224 		    info->flags & IEEE80211_TX_CTL_AMPDU)
1225 			info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1226 	}
1227 
1228 	if (!tx->sta)
1229 		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1230 	else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1231 		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1232 		ieee80211_check_fast_xmit(tx->sta);
1233 	}
1234 
1235 	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1236 
1237 	return TX_CONTINUE;
1238 }
1239 
1240 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1241 					  struct ieee80211_vif *vif,
1242 					  struct sta_info *sta,
1243 					  struct sk_buff *skb)
1244 {
1245 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1246 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1247 	struct ieee80211_txq *txq = NULL;
1248 
1249 	if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1250 	    (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1251 		return NULL;
1252 
1253 	if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) {
1254 		if ((!ieee80211_is_mgmt(hdr->frame_control) ||
1255 		     ieee80211_is_bufferable_mmpdu(hdr->frame_control) ||
1256 		     vif->type == NL80211_IFTYPE_STATION) &&
1257 		    sta && sta->uploaded) {
1258 			/*
1259 			 * This will be NULL if the driver didn't set the
1260 			 * opt-in hardware flag.
1261 			 */
1262 			txq = sta->sta.txq[IEEE80211_NUM_TIDS];
1263 		}
1264 	} else if (sta) {
1265 		u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1266 
1267 		if (!sta->uploaded)
1268 			return NULL;
1269 
1270 		txq = sta->sta.txq[tid];
1271 	} else if (vif) {
1272 		txq = vif->txq;
1273 	}
1274 
1275 	if (!txq)
1276 		return NULL;
1277 
1278 	return to_txq_info(txq);
1279 }
1280 
1281 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1282 {
1283 	IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1284 }
1285 
1286 static u32 codel_skb_len_func(const struct sk_buff *skb)
1287 {
1288 	return skb->len;
1289 }
1290 
1291 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1292 {
1293 	const struct ieee80211_tx_info *info;
1294 
1295 	info = (const struct ieee80211_tx_info *)skb->cb;
1296 	return info->control.enqueue_time;
1297 }
1298 
1299 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1300 					  void *ctx)
1301 {
1302 	struct ieee80211_local *local;
1303 	struct txq_info *txqi;
1304 	struct fq *fq;
1305 	struct fq_flow *flow;
1306 
1307 	txqi = ctx;
1308 	local = vif_to_sdata(txqi->txq.vif)->local;
1309 	fq = &local->fq;
1310 
1311 	if (cvars == &txqi->def_cvars)
1312 		flow = &txqi->def_flow;
1313 	else
1314 		flow = &fq->flows[cvars - local->cvars];
1315 
1316 	return fq_flow_dequeue(fq, flow);
1317 }
1318 
1319 static void codel_drop_func(struct sk_buff *skb,
1320 			    void *ctx)
1321 {
1322 	struct ieee80211_local *local;
1323 	struct ieee80211_hw *hw;
1324 	struct txq_info *txqi;
1325 
1326 	txqi = ctx;
1327 	local = vif_to_sdata(txqi->txq.vif)->local;
1328 	hw = &local->hw;
1329 
1330 	ieee80211_free_txskb(hw, skb);
1331 }
1332 
1333 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1334 					   struct fq_tin *tin,
1335 					   struct fq_flow *flow)
1336 {
1337 	struct ieee80211_local *local;
1338 	struct txq_info *txqi;
1339 	struct codel_vars *cvars;
1340 	struct codel_params *cparams;
1341 	struct codel_stats *cstats;
1342 
1343 	local = container_of(fq, struct ieee80211_local, fq);
1344 	txqi = container_of(tin, struct txq_info, tin);
1345 	cstats = &txqi->cstats;
1346 
1347 	if (txqi->txq.sta) {
1348 		struct sta_info *sta = container_of(txqi->txq.sta,
1349 						    struct sta_info, sta);
1350 		cparams = &sta->cparams;
1351 	} else {
1352 		cparams = &local->cparams;
1353 	}
1354 
1355 	if (flow == &txqi->def_flow)
1356 		cvars = &txqi->def_cvars;
1357 	else
1358 		cvars = &local->cvars[flow - fq->flows];
1359 
1360 	return codel_dequeue(txqi,
1361 			     &flow->backlog,
1362 			     cparams,
1363 			     cvars,
1364 			     cstats,
1365 			     codel_skb_len_func,
1366 			     codel_skb_time_func,
1367 			     codel_drop_func,
1368 			     codel_dequeue_func);
1369 }
1370 
1371 static void fq_skb_free_func(struct fq *fq,
1372 			     struct fq_tin *tin,
1373 			     struct fq_flow *flow,
1374 			     struct sk_buff *skb)
1375 {
1376 	struct ieee80211_local *local;
1377 
1378 	local = container_of(fq, struct ieee80211_local, fq);
1379 	ieee80211_free_txskb(&local->hw, skb);
1380 }
1381 
1382 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1383 						struct fq_tin *tin,
1384 						int idx,
1385 						struct sk_buff *skb)
1386 {
1387 	struct txq_info *txqi;
1388 
1389 	txqi = container_of(tin, struct txq_info, tin);
1390 	return &txqi->def_flow;
1391 }
1392 
1393 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1394 				  struct txq_info *txqi,
1395 				  struct sk_buff *skb)
1396 {
1397 	struct fq *fq = &local->fq;
1398 	struct fq_tin *tin = &txqi->tin;
1399 	u32 flow_idx = fq_flow_idx(fq, skb);
1400 
1401 	ieee80211_set_skb_enqueue_time(skb);
1402 
1403 	spin_lock_bh(&fq->lock);
1404 	fq_tin_enqueue(fq, tin, flow_idx, skb,
1405 		       fq_skb_free_func,
1406 		       fq_flow_get_default_func);
1407 	spin_unlock_bh(&fq->lock);
1408 }
1409 
1410 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin,
1411 				struct fq_flow *flow, struct sk_buff *skb,
1412 				void *data)
1413 {
1414 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1415 
1416 	return info->control.vif == data;
1417 }
1418 
1419 void ieee80211_txq_remove_vlan(struct ieee80211_local *local,
1420 			       struct ieee80211_sub_if_data *sdata)
1421 {
1422 	struct fq *fq = &local->fq;
1423 	struct txq_info *txqi;
1424 	struct fq_tin *tin;
1425 	struct ieee80211_sub_if_data *ap;
1426 
1427 	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1428 		return;
1429 
1430 	ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1431 
1432 	if (!ap->vif.txq)
1433 		return;
1434 
1435 	txqi = to_txq_info(ap->vif.txq);
1436 	tin = &txqi->tin;
1437 
1438 	spin_lock_bh(&fq->lock);
1439 	fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif,
1440 		      fq_skb_free_func);
1441 	spin_unlock_bh(&fq->lock);
1442 }
1443 
1444 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1445 			struct sta_info *sta,
1446 			struct txq_info *txqi, int tid)
1447 {
1448 	fq_tin_init(&txqi->tin);
1449 	fq_flow_init(&txqi->def_flow);
1450 	codel_vars_init(&txqi->def_cvars);
1451 	codel_stats_init(&txqi->cstats);
1452 	__skb_queue_head_init(&txqi->frags);
1453 	INIT_LIST_HEAD(&txqi->schedule_order);
1454 
1455 	txqi->txq.vif = &sdata->vif;
1456 
1457 	if (!sta) {
1458 		sdata->vif.txq = &txqi->txq;
1459 		txqi->txq.tid = 0;
1460 		txqi->txq.ac = IEEE80211_AC_BE;
1461 
1462 		return;
1463 	}
1464 
1465 	if (tid == IEEE80211_NUM_TIDS) {
1466 		if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1467 			/* Drivers need to opt in to the management MPDU TXQ */
1468 			if (!ieee80211_hw_check(&sdata->local->hw,
1469 						STA_MMPDU_TXQ))
1470 				return;
1471 		} else if (!ieee80211_hw_check(&sdata->local->hw,
1472 					       BUFF_MMPDU_TXQ)) {
1473 			/* Drivers need to opt in to the bufferable MMPDU TXQ */
1474 			return;
1475 		}
1476 		txqi->txq.ac = IEEE80211_AC_VO;
1477 	} else {
1478 		txqi->txq.ac = ieee80211_ac_from_tid(tid);
1479 	}
1480 
1481 	txqi->txq.sta = &sta->sta;
1482 	txqi->txq.tid = tid;
1483 	sta->sta.txq[tid] = &txqi->txq;
1484 }
1485 
1486 void ieee80211_txq_purge(struct ieee80211_local *local,
1487 			 struct txq_info *txqi)
1488 {
1489 	struct fq *fq = &local->fq;
1490 	struct fq_tin *tin = &txqi->tin;
1491 
1492 	spin_lock_bh(&fq->lock);
1493 	fq_tin_reset(fq, tin, fq_skb_free_func);
1494 	ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1495 	spin_unlock_bh(&fq->lock);
1496 
1497 	spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]);
1498 	list_del_init(&txqi->schedule_order);
1499 	spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]);
1500 }
1501 
1502 void ieee80211_txq_set_params(struct ieee80211_local *local)
1503 {
1504 	if (local->hw.wiphy->txq_limit)
1505 		local->fq.limit = local->hw.wiphy->txq_limit;
1506 	else
1507 		local->hw.wiphy->txq_limit = local->fq.limit;
1508 
1509 	if (local->hw.wiphy->txq_memory_limit)
1510 		local->fq.memory_limit = local->hw.wiphy->txq_memory_limit;
1511 	else
1512 		local->hw.wiphy->txq_memory_limit = local->fq.memory_limit;
1513 
1514 	if (local->hw.wiphy->txq_quantum)
1515 		local->fq.quantum = local->hw.wiphy->txq_quantum;
1516 	else
1517 		local->hw.wiphy->txq_quantum = local->fq.quantum;
1518 }
1519 
1520 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1521 {
1522 	struct fq *fq = &local->fq;
1523 	int ret;
1524 	int i;
1525 	bool supp_vht = false;
1526 	enum nl80211_band band;
1527 
1528 	if (!local->ops->wake_tx_queue)
1529 		return 0;
1530 
1531 	ret = fq_init(fq, 4096);
1532 	if (ret)
1533 		return ret;
1534 
1535 	/*
1536 	 * If the hardware doesn't support VHT, it is safe to limit the maximum
1537 	 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1538 	 */
1539 	for (band = 0; band < NUM_NL80211_BANDS; band++) {
1540 		struct ieee80211_supported_band *sband;
1541 
1542 		sband = local->hw.wiphy->bands[band];
1543 		if (!sband)
1544 			continue;
1545 
1546 		supp_vht = supp_vht || sband->vht_cap.vht_supported;
1547 	}
1548 
1549 	if (!supp_vht)
1550 		fq->memory_limit = 4 << 20; /* 4 Mbytes */
1551 
1552 	codel_params_init(&local->cparams);
1553 	local->cparams.interval = MS2TIME(100);
1554 	local->cparams.target = MS2TIME(20);
1555 	local->cparams.ecn = true;
1556 
1557 	local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1558 			       GFP_KERNEL);
1559 	if (!local->cvars) {
1560 		spin_lock_bh(&fq->lock);
1561 		fq_reset(fq, fq_skb_free_func);
1562 		spin_unlock_bh(&fq->lock);
1563 		return -ENOMEM;
1564 	}
1565 
1566 	for (i = 0; i < fq->flows_cnt; i++)
1567 		codel_vars_init(&local->cvars[i]);
1568 
1569 	ieee80211_txq_set_params(local);
1570 
1571 	return 0;
1572 }
1573 
1574 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1575 {
1576 	struct fq *fq = &local->fq;
1577 
1578 	if (!local->ops->wake_tx_queue)
1579 		return;
1580 
1581 	kfree(local->cvars);
1582 	local->cvars = NULL;
1583 
1584 	spin_lock_bh(&fq->lock);
1585 	fq_reset(fq, fq_skb_free_func);
1586 	spin_unlock_bh(&fq->lock);
1587 }
1588 
1589 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1590 				struct ieee80211_sub_if_data *sdata,
1591 				struct sta_info *sta,
1592 				struct sk_buff *skb)
1593 {
1594 	struct ieee80211_vif *vif;
1595 	struct txq_info *txqi;
1596 
1597 	if (!local->ops->wake_tx_queue ||
1598 	    sdata->vif.type == NL80211_IFTYPE_MONITOR)
1599 		return false;
1600 
1601 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1602 		sdata = container_of(sdata->bss,
1603 				     struct ieee80211_sub_if_data, u.ap);
1604 
1605 	vif = &sdata->vif;
1606 	txqi = ieee80211_get_txq(local, vif, sta, skb);
1607 
1608 	if (!txqi)
1609 		return false;
1610 
1611 	ieee80211_txq_enqueue(local, txqi, skb);
1612 
1613 	schedule_and_wake_txq(local, txqi);
1614 
1615 	return true;
1616 }
1617 
1618 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1619 			       struct ieee80211_vif *vif,
1620 			       struct ieee80211_sta *sta,
1621 			       struct sk_buff_head *skbs,
1622 			       bool txpending)
1623 {
1624 	struct ieee80211_tx_control control = {};
1625 	struct sk_buff *skb, *tmp;
1626 	unsigned long flags;
1627 
1628 	skb_queue_walk_safe(skbs, skb, tmp) {
1629 		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1630 		int q = info->hw_queue;
1631 
1632 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1633 		if (WARN_ON_ONCE(q >= local->hw.queues)) {
1634 			__skb_unlink(skb, skbs);
1635 			ieee80211_free_txskb(&local->hw, skb);
1636 			continue;
1637 		}
1638 #endif
1639 
1640 		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1641 		if (local->queue_stop_reasons[q] ||
1642 		    (!txpending && !skb_queue_empty(&local->pending[q]))) {
1643 			if (unlikely(info->flags &
1644 				     IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1645 				if (local->queue_stop_reasons[q] &
1646 				    ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1647 					/*
1648 					 * Drop off-channel frames if queues
1649 					 * are stopped for any reason other
1650 					 * than off-channel operation. Never
1651 					 * queue them.
1652 					 */
1653 					spin_unlock_irqrestore(
1654 						&local->queue_stop_reason_lock,
1655 						flags);
1656 					ieee80211_purge_tx_queue(&local->hw,
1657 								 skbs);
1658 					return true;
1659 				}
1660 			} else {
1661 
1662 				/*
1663 				 * Since queue is stopped, queue up frames for
1664 				 * later transmission from the tx-pending
1665 				 * tasklet when the queue is woken again.
1666 				 */
1667 				if (txpending)
1668 					skb_queue_splice_init(skbs,
1669 							      &local->pending[q]);
1670 				else
1671 					skb_queue_splice_tail_init(skbs,
1672 								   &local->pending[q]);
1673 
1674 				spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1675 						       flags);
1676 				return false;
1677 			}
1678 		}
1679 		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1680 
1681 		info->control.vif = vif;
1682 		control.sta = sta;
1683 
1684 		__skb_unlink(skb, skbs);
1685 		drv_tx(local, &control, skb);
1686 	}
1687 
1688 	return true;
1689 }
1690 
1691 /*
1692  * Returns false if the frame couldn't be transmitted but was queued instead.
1693  */
1694 static bool __ieee80211_tx(struct ieee80211_local *local,
1695 			   struct sk_buff_head *skbs, int led_len,
1696 			   struct sta_info *sta, bool txpending)
1697 {
1698 	struct ieee80211_tx_info *info;
1699 	struct ieee80211_sub_if_data *sdata;
1700 	struct ieee80211_vif *vif;
1701 	struct ieee80211_sta *pubsta;
1702 	struct sk_buff *skb;
1703 	bool result = true;
1704 	__le16 fc;
1705 
1706 	if (WARN_ON(skb_queue_empty(skbs)))
1707 		return true;
1708 
1709 	skb = skb_peek(skbs);
1710 	fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1711 	info = IEEE80211_SKB_CB(skb);
1712 	sdata = vif_to_sdata(info->control.vif);
1713 	if (sta && !sta->uploaded)
1714 		sta = NULL;
1715 
1716 	if (sta)
1717 		pubsta = &sta->sta;
1718 	else
1719 		pubsta = NULL;
1720 
1721 	switch (sdata->vif.type) {
1722 	case NL80211_IFTYPE_MONITOR:
1723 		if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1724 			vif = &sdata->vif;
1725 			break;
1726 		}
1727 		sdata = rcu_dereference(local->monitor_sdata);
1728 		if (sdata) {
1729 			vif = &sdata->vif;
1730 			info->hw_queue =
1731 				vif->hw_queue[skb_get_queue_mapping(skb)];
1732 		} else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1733 			ieee80211_purge_tx_queue(&local->hw, skbs);
1734 			return true;
1735 		} else
1736 			vif = NULL;
1737 		break;
1738 	case NL80211_IFTYPE_AP_VLAN:
1739 		sdata = container_of(sdata->bss,
1740 				     struct ieee80211_sub_if_data, u.ap);
1741 		/* fall through */
1742 	default:
1743 		vif = &sdata->vif;
1744 		break;
1745 	}
1746 
1747 	result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1748 				    txpending);
1749 
1750 	ieee80211_tpt_led_trig_tx(local, fc, led_len);
1751 
1752 	WARN_ON_ONCE(!skb_queue_empty(skbs));
1753 
1754 	return result;
1755 }
1756 
1757 /*
1758  * Invoke TX handlers, return 0 on success and non-zero if the
1759  * frame was dropped or queued.
1760  *
1761  * The handlers are split into an early and late part. The latter is everything
1762  * that can be sensitive to reordering, and will be deferred to after packets
1763  * are dequeued from the intermediate queues (when they are enabled).
1764  */
1765 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1766 {
1767 	ieee80211_tx_result res = TX_DROP;
1768 
1769 #define CALL_TXH(txh) \
1770 	do {				\
1771 		res = txh(tx);		\
1772 		if (res != TX_CONTINUE)	\
1773 			goto txh_done;	\
1774 	} while (0)
1775 
1776 	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1777 	CALL_TXH(ieee80211_tx_h_check_assoc);
1778 	CALL_TXH(ieee80211_tx_h_ps_buf);
1779 	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1780 	CALL_TXH(ieee80211_tx_h_select_key);
1781 	if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1782 		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1783 
1784  txh_done:
1785 	if (unlikely(res == TX_DROP)) {
1786 		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1787 		if (tx->skb)
1788 			ieee80211_free_txskb(&tx->local->hw, tx->skb);
1789 		else
1790 			ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1791 		return -1;
1792 	} else if (unlikely(res == TX_QUEUED)) {
1793 		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1794 		return -1;
1795 	}
1796 
1797 	return 0;
1798 }
1799 
1800 /*
1801  * Late handlers can be called while the sta lock is held. Handlers that can
1802  * cause packets to be generated will cause deadlock!
1803  */
1804 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1805 {
1806 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1807 	ieee80211_tx_result res = TX_CONTINUE;
1808 
1809 	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1810 		__skb_queue_tail(&tx->skbs, tx->skb);
1811 		tx->skb = NULL;
1812 		goto txh_done;
1813 	}
1814 
1815 	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1816 	CALL_TXH(ieee80211_tx_h_sequence);
1817 	CALL_TXH(ieee80211_tx_h_fragment);
1818 	/* handlers after fragment must be aware of tx info fragmentation! */
1819 	CALL_TXH(ieee80211_tx_h_stats);
1820 	CALL_TXH(ieee80211_tx_h_encrypt);
1821 	if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1822 		CALL_TXH(ieee80211_tx_h_calculate_duration);
1823 #undef CALL_TXH
1824 
1825  txh_done:
1826 	if (unlikely(res == TX_DROP)) {
1827 		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1828 		if (tx->skb)
1829 			ieee80211_free_txskb(&tx->local->hw, tx->skb);
1830 		else
1831 			ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1832 		return -1;
1833 	} else if (unlikely(res == TX_QUEUED)) {
1834 		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1835 		return -1;
1836 	}
1837 
1838 	return 0;
1839 }
1840 
1841 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1842 {
1843 	int r = invoke_tx_handlers_early(tx);
1844 
1845 	if (r)
1846 		return r;
1847 	return invoke_tx_handlers_late(tx);
1848 }
1849 
1850 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1851 			      struct ieee80211_vif *vif, struct sk_buff *skb,
1852 			      int band, struct ieee80211_sta **sta)
1853 {
1854 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1855 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1856 	struct ieee80211_tx_data tx;
1857 	struct sk_buff *skb2;
1858 
1859 	if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1860 		return false;
1861 
1862 	info->band = band;
1863 	info->control.vif = vif;
1864 	info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1865 
1866 	if (invoke_tx_handlers(&tx))
1867 		return false;
1868 
1869 	if (sta) {
1870 		if (tx.sta)
1871 			*sta = &tx.sta->sta;
1872 		else
1873 			*sta = NULL;
1874 	}
1875 
1876 	/* this function isn't suitable for fragmented data frames */
1877 	skb2 = __skb_dequeue(&tx.skbs);
1878 	if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1879 		ieee80211_free_txskb(hw, skb2);
1880 		ieee80211_purge_tx_queue(hw, &tx.skbs);
1881 		return false;
1882 	}
1883 
1884 	return true;
1885 }
1886 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1887 
1888 /*
1889  * Returns false if the frame couldn't be transmitted but was queued instead.
1890  */
1891 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1892 			 struct sta_info *sta, struct sk_buff *skb,
1893 			 bool txpending, u32 txdata_flags)
1894 {
1895 	struct ieee80211_local *local = sdata->local;
1896 	struct ieee80211_tx_data tx;
1897 	ieee80211_tx_result res_prepare;
1898 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1899 	bool result = true;
1900 	int led_len;
1901 
1902 	if (unlikely(skb->len < 10)) {
1903 		dev_kfree_skb(skb);
1904 		return true;
1905 	}
1906 
1907 	/* initialises tx */
1908 	led_len = skb->len;
1909 	res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1910 
1911 	tx.flags |= txdata_flags;
1912 
1913 	if (unlikely(res_prepare == TX_DROP)) {
1914 		ieee80211_free_txskb(&local->hw, skb);
1915 		return true;
1916 	} else if (unlikely(res_prepare == TX_QUEUED)) {
1917 		return true;
1918 	}
1919 
1920 	/* set up hw_queue value early */
1921 	if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1922 	    !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1923 		info->hw_queue =
1924 			sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1925 
1926 	if (invoke_tx_handlers_early(&tx))
1927 		return true;
1928 
1929 	if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1930 		return true;
1931 
1932 	if (!invoke_tx_handlers_late(&tx))
1933 		result = __ieee80211_tx(local, &tx.skbs, led_len,
1934 					tx.sta, txpending);
1935 
1936 	return result;
1937 }
1938 
1939 /* device xmit handlers */
1940 
1941 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1942 				struct sk_buff *skb,
1943 				int head_need, bool may_encrypt)
1944 {
1945 	struct ieee80211_local *local = sdata->local;
1946 	struct ieee80211_hdr *hdr;
1947 	bool enc_tailroom;
1948 	int tail_need = 0;
1949 
1950 	hdr = (struct ieee80211_hdr *) skb->data;
1951 	enc_tailroom = may_encrypt &&
1952 		       (sdata->crypto_tx_tailroom_needed_cnt ||
1953 			ieee80211_is_mgmt(hdr->frame_control));
1954 
1955 	if (enc_tailroom) {
1956 		tail_need = IEEE80211_ENCRYPT_TAILROOM;
1957 		tail_need -= skb_tailroom(skb);
1958 		tail_need = max_t(int, tail_need, 0);
1959 	}
1960 
1961 	if (skb_cloned(skb) &&
1962 	    (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1963 	     !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom))
1964 		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1965 	else if (head_need || tail_need)
1966 		I802_DEBUG_INC(local->tx_expand_skb_head);
1967 	else
1968 		return 0;
1969 
1970 	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1971 		wiphy_debug(local->hw.wiphy,
1972 			    "failed to reallocate TX buffer\n");
1973 		return -ENOMEM;
1974 	}
1975 
1976 	return 0;
1977 }
1978 
1979 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1980 		    struct sta_info *sta, struct sk_buff *skb,
1981 		    u32 txdata_flags)
1982 {
1983 	struct ieee80211_local *local = sdata->local;
1984 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1985 	struct ieee80211_hdr *hdr;
1986 	int headroom;
1987 	bool may_encrypt;
1988 
1989 	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1990 
1991 	headroom = local->tx_headroom;
1992 	if (may_encrypt)
1993 		headroom += sdata->encrypt_headroom;
1994 	headroom -= skb_headroom(skb);
1995 	headroom = max_t(int, 0, headroom);
1996 
1997 	if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1998 		ieee80211_free_txskb(&local->hw, skb);
1999 		return;
2000 	}
2001 
2002 	hdr = (struct ieee80211_hdr *) skb->data;
2003 	info->control.vif = &sdata->vif;
2004 
2005 	if (ieee80211_vif_is_mesh(&sdata->vif)) {
2006 		if (ieee80211_is_data(hdr->frame_control) &&
2007 		    is_unicast_ether_addr(hdr->addr1)) {
2008 			if (mesh_nexthop_resolve(sdata, skb))
2009 				return; /* skb queued: don't free */
2010 		} else {
2011 			ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
2012 		}
2013 	}
2014 
2015 	ieee80211_set_qos_hdr(sdata, skb);
2016 	ieee80211_tx(sdata, sta, skb, false, txdata_flags);
2017 }
2018 
2019 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
2020 					struct sk_buff *skb)
2021 {
2022 	struct ieee80211_radiotap_iterator iterator;
2023 	struct ieee80211_radiotap_header *rthdr =
2024 		(struct ieee80211_radiotap_header *) skb->data;
2025 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2026 	struct ieee80211_supported_band *sband =
2027 		local->hw.wiphy->bands[info->band];
2028 	int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
2029 						   NULL);
2030 	u16 txflags;
2031 	u16 rate = 0;
2032 	bool rate_found = false;
2033 	u8 rate_retries = 0;
2034 	u16 rate_flags = 0;
2035 	u8 mcs_known, mcs_flags, mcs_bw;
2036 	u16 vht_known;
2037 	u8 vht_mcs = 0, vht_nss = 0;
2038 	int i;
2039 
2040 	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
2041 		       IEEE80211_TX_CTL_DONTFRAG;
2042 
2043 	/*
2044 	 * for every radiotap entry that is present
2045 	 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
2046 	 * entries present, or -EINVAL on error)
2047 	 */
2048 
2049 	while (!ret) {
2050 		ret = ieee80211_radiotap_iterator_next(&iterator);
2051 
2052 		if (ret)
2053 			continue;
2054 
2055 		/* see if this argument is something we can use */
2056 		switch (iterator.this_arg_index) {
2057 		/*
2058 		 * You must take care when dereferencing iterator.this_arg
2059 		 * for multibyte types... the pointer is not aligned.  Use
2060 		 * get_unaligned((type *)iterator.this_arg) to dereference
2061 		 * iterator.this_arg for type "type" safely on all arches.
2062 		*/
2063 		case IEEE80211_RADIOTAP_FLAGS:
2064 			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
2065 				/*
2066 				 * this indicates that the skb we have been
2067 				 * handed has the 32-bit FCS CRC at the end...
2068 				 * we should react to that by snipping it off
2069 				 * because it will be recomputed and added
2070 				 * on transmission
2071 				 */
2072 				if (skb->len < (iterator._max_length + FCS_LEN))
2073 					return false;
2074 
2075 				skb_trim(skb, skb->len - FCS_LEN);
2076 			}
2077 			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
2078 				info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
2079 			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
2080 				info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
2081 			break;
2082 
2083 		case IEEE80211_RADIOTAP_TX_FLAGS:
2084 			txflags = get_unaligned_le16(iterator.this_arg);
2085 			if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
2086 				info->flags |= IEEE80211_TX_CTL_NO_ACK;
2087 			break;
2088 
2089 		case IEEE80211_RADIOTAP_RATE:
2090 			rate = *iterator.this_arg;
2091 			rate_flags = 0;
2092 			rate_found = true;
2093 			break;
2094 
2095 		case IEEE80211_RADIOTAP_DATA_RETRIES:
2096 			rate_retries = *iterator.this_arg;
2097 			break;
2098 
2099 		case IEEE80211_RADIOTAP_MCS:
2100 			mcs_known = iterator.this_arg[0];
2101 			mcs_flags = iterator.this_arg[1];
2102 			if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2103 				break;
2104 
2105 			rate_found = true;
2106 			rate = iterator.this_arg[2];
2107 			rate_flags = IEEE80211_TX_RC_MCS;
2108 
2109 			if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2110 			    mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2111 				rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2112 
2113 			mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2114 			if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2115 			    mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2116 				rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2117 			break;
2118 
2119 		case IEEE80211_RADIOTAP_VHT:
2120 			vht_known = get_unaligned_le16(iterator.this_arg);
2121 			rate_found = true;
2122 
2123 			rate_flags = IEEE80211_TX_RC_VHT_MCS;
2124 			if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2125 			    (iterator.this_arg[2] &
2126 			     IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2127 				rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2128 			if (vht_known &
2129 			    IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2130 				if (iterator.this_arg[3] == 1)
2131 					rate_flags |=
2132 						IEEE80211_TX_RC_40_MHZ_WIDTH;
2133 				else if (iterator.this_arg[3] == 4)
2134 					rate_flags |=
2135 						IEEE80211_TX_RC_80_MHZ_WIDTH;
2136 				else if (iterator.this_arg[3] == 11)
2137 					rate_flags |=
2138 						IEEE80211_TX_RC_160_MHZ_WIDTH;
2139 			}
2140 
2141 			vht_mcs = iterator.this_arg[4] >> 4;
2142 			vht_nss = iterator.this_arg[4] & 0xF;
2143 			break;
2144 
2145 		/*
2146 		 * Please update the file
2147 		 * Documentation/networking/mac80211-injection.txt
2148 		 * when parsing new fields here.
2149 		 */
2150 
2151 		default:
2152 			break;
2153 		}
2154 	}
2155 
2156 	if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2157 		return false;
2158 
2159 	if (rate_found) {
2160 		info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2161 
2162 		for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2163 			info->control.rates[i].idx = -1;
2164 			info->control.rates[i].flags = 0;
2165 			info->control.rates[i].count = 0;
2166 		}
2167 
2168 		if (rate_flags & IEEE80211_TX_RC_MCS) {
2169 			info->control.rates[0].idx = rate;
2170 		} else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2171 			ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2172 					       vht_nss);
2173 		} else {
2174 			for (i = 0; i < sband->n_bitrates; i++) {
2175 				if (rate * 5 != sband->bitrates[i].bitrate)
2176 					continue;
2177 
2178 				info->control.rates[0].idx = i;
2179 				break;
2180 			}
2181 		}
2182 
2183 		if (info->control.rates[0].idx < 0)
2184 			info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2185 
2186 		info->control.rates[0].flags = rate_flags;
2187 		info->control.rates[0].count = min_t(u8, rate_retries + 1,
2188 						     local->hw.max_rate_tries);
2189 	}
2190 
2191 	/*
2192 	 * remove the radiotap header
2193 	 * iterator->_max_length was sanity-checked against
2194 	 * skb->len by iterator init
2195 	 */
2196 	skb_pull(skb, iterator._max_length);
2197 
2198 	return true;
2199 }
2200 
2201 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2202 					 struct net_device *dev)
2203 {
2204 	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2205 	struct ieee80211_chanctx_conf *chanctx_conf;
2206 	struct ieee80211_radiotap_header *prthdr =
2207 		(struct ieee80211_radiotap_header *)skb->data;
2208 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2209 	struct ieee80211_hdr *hdr;
2210 	struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2211 	struct cfg80211_chan_def *chandef;
2212 	u16 len_rthdr;
2213 	int hdrlen;
2214 
2215 	/* check for not even having the fixed radiotap header part */
2216 	if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2217 		goto fail; /* too short to be possibly valid */
2218 
2219 	/* is it a header version we can trust to find length from? */
2220 	if (unlikely(prthdr->it_version))
2221 		goto fail; /* only version 0 is supported */
2222 
2223 	/* then there must be a radiotap header with a length we can use */
2224 	len_rthdr = ieee80211_get_radiotap_len(skb->data);
2225 
2226 	/* does the skb contain enough to deliver on the alleged length? */
2227 	if (unlikely(skb->len < len_rthdr))
2228 		goto fail; /* skb too short for claimed rt header extent */
2229 
2230 	/*
2231 	 * fix up the pointers accounting for the radiotap
2232 	 * header still being in there.  We are being given
2233 	 * a precooked IEEE80211 header so no need for
2234 	 * normal processing
2235 	 */
2236 	skb_set_mac_header(skb, len_rthdr);
2237 	/*
2238 	 * these are just fixed to the end of the rt area since we
2239 	 * don't have any better information and at this point, nobody cares
2240 	 */
2241 	skb_set_network_header(skb, len_rthdr);
2242 	skb_set_transport_header(skb, len_rthdr);
2243 
2244 	if (skb->len < len_rthdr + 2)
2245 		goto fail;
2246 
2247 	hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2248 	hdrlen = ieee80211_hdrlen(hdr->frame_control);
2249 
2250 	if (skb->len < len_rthdr + hdrlen)
2251 		goto fail;
2252 
2253 	/*
2254 	 * Initialize skb->protocol if the injected frame is a data frame
2255 	 * carrying a rfc1042 header
2256 	 */
2257 	if (ieee80211_is_data(hdr->frame_control) &&
2258 	    skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2259 		u8 *payload = (u8 *)hdr + hdrlen;
2260 
2261 		if (ether_addr_equal(payload, rfc1042_header))
2262 			skb->protocol = cpu_to_be16((payload[6] << 8) |
2263 						    payload[7]);
2264 	}
2265 
2266 	memset(info, 0, sizeof(*info));
2267 
2268 	info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2269 		      IEEE80211_TX_CTL_INJECTED;
2270 
2271 	rcu_read_lock();
2272 
2273 	/*
2274 	 * We process outgoing injected frames that have a local address
2275 	 * we handle as though they are non-injected frames.
2276 	 * This code here isn't entirely correct, the local MAC address
2277 	 * isn't always enough to find the interface to use; for proper
2278 	 * VLAN/WDS support we will need a different mechanism (which
2279 	 * likely isn't going to be monitor interfaces).
2280 	 */
2281 	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2282 
2283 	list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2284 		if (!ieee80211_sdata_running(tmp_sdata))
2285 			continue;
2286 		if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2287 		    tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2288 		    tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2289 			continue;
2290 		if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2291 			sdata = tmp_sdata;
2292 			break;
2293 		}
2294 	}
2295 
2296 	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2297 	if (!chanctx_conf) {
2298 		tmp_sdata = rcu_dereference(local->monitor_sdata);
2299 		if (tmp_sdata)
2300 			chanctx_conf =
2301 				rcu_dereference(tmp_sdata->vif.chanctx_conf);
2302 	}
2303 
2304 	if (chanctx_conf)
2305 		chandef = &chanctx_conf->def;
2306 	else if (!local->use_chanctx)
2307 		chandef = &local->_oper_chandef;
2308 	else
2309 		goto fail_rcu;
2310 
2311 	/*
2312 	 * Frame injection is not allowed if beaconing is not allowed
2313 	 * or if we need radar detection. Beaconing is usually not allowed when
2314 	 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2315 	 * Passive scan is also used in world regulatory domains where
2316 	 * your country is not known and as such it should be treated as
2317 	 * NO TX unless the channel is explicitly allowed in which case
2318 	 * your current regulatory domain would not have the passive scan
2319 	 * flag.
2320 	 *
2321 	 * Since AP mode uses monitor interfaces to inject/TX management
2322 	 * frames we can make AP mode the exception to this rule once it
2323 	 * supports radar detection as its implementation can deal with
2324 	 * radar detection by itself. We can do that later by adding a
2325 	 * monitor flag interfaces used for AP support.
2326 	 */
2327 	if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2328 				     sdata->vif.type))
2329 		goto fail_rcu;
2330 
2331 	info->band = chandef->chan->band;
2332 
2333 	/* process and remove the injection radiotap header */
2334 	if (!ieee80211_parse_tx_radiotap(local, skb))
2335 		goto fail_rcu;
2336 
2337 	ieee80211_xmit(sdata, NULL, skb, 0);
2338 	rcu_read_unlock();
2339 
2340 	return NETDEV_TX_OK;
2341 
2342 fail_rcu:
2343 	rcu_read_unlock();
2344 fail:
2345 	dev_kfree_skb(skb);
2346 	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2347 }
2348 
2349 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2350 {
2351 	u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2352 
2353 	return ethertype == ETH_P_TDLS &&
2354 	       skb->len > 14 &&
2355 	       skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2356 }
2357 
2358 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2359 				   struct sk_buff *skb,
2360 				   struct sta_info **sta_out)
2361 {
2362 	struct sta_info *sta;
2363 
2364 	switch (sdata->vif.type) {
2365 	case NL80211_IFTYPE_AP_VLAN:
2366 		sta = rcu_dereference(sdata->u.vlan.sta);
2367 		if (sta) {
2368 			*sta_out = sta;
2369 			return 0;
2370 		} else if (sdata->wdev.use_4addr) {
2371 			return -ENOLINK;
2372 		}
2373 		/* fall through */
2374 	case NL80211_IFTYPE_AP:
2375 	case NL80211_IFTYPE_OCB:
2376 	case NL80211_IFTYPE_ADHOC:
2377 		if (is_multicast_ether_addr(skb->data)) {
2378 			*sta_out = ERR_PTR(-ENOENT);
2379 			return 0;
2380 		}
2381 		sta = sta_info_get_bss(sdata, skb->data);
2382 		break;
2383 	case NL80211_IFTYPE_WDS:
2384 		sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2385 		break;
2386 #ifdef CONFIG_MAC80211_MESH
2387 	case NL80211_IFTYPE_MESH_POINT:
2388 		/* determined much later */
2389 		*sta_out = NULL;
2390 		return 0;
2391 #endif
2392 	case NL80211_IFTYPE_STATION:
2393 		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2394 			sta = sta_info_get(sdata, skb->data);
2395 			if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2396 				if (test_sta_flag(sta,
2397 						  WLAN_STA_TDLS_PEER_AUTH)) {
2398 					*sta_out = sta;
2399 					return 0;
2400 				}
2401 
2402 				/*
2403 				 * TDLS link during setup - throw out frames to
2404 				 * peer. Allow TDLS-setup frames to unauthorized
2405 				 * peers for the special case of a link teardown
2406 				 * after a TDLS sta is removed due to being
2407 				 * unreachable.
2408 				 */
2409 				if (!ieee80211_is_tdls_setup(skb))
2410 					return -EINVAL;
2411 			}
2412 
2413 		}
2414 
2415 		sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2416 		if (!sta)
2417 			return -ENOLINK;
2418 		break;
2419 	default:
2420 		return -EINVAL;
2421 	}
2422 
2423 	*sta_out = sta ?: ERR_PTR(-ENOENT);
2424 	return 0;
2425 }
2426 
2427 /**
2428  * ieee80211_build_hdr - build 802.11 header in the given frame
2429  * @sdata: virtual interface to build the header for
2430  * @skb: the skb to build the header in
2431  * @info_flags: skb flags to set
2432  * @ctrl_flags: info control flags to set
2433  *
2434  * This function takes the skb with 802.3 header and reformats the header to
2435  * the appropriate IEEE 802.11 header based on which interface the packet is
2436  * being transmitted on.
2437  *
2438  * Note that this function also takes care of the TX status request and
2439  * potential unsharing of the SKB - this needs to be interleaved with the
2440  * header building.
2441  *
2442  * The function requires the read-side RCU lock held
2443  *
2444  * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2445  */
2446 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2447 					   struct sk_buff *skb, u32 info_flags,
2448 					   struct sta_info *sta, u32 ctrl_flags)
2449 {
2450 	struct ieee80211_local *local = sdata->local;
2451 	struct ieee80211_tx_info *info;
2452 	int head_need;
2453 	u16 ethertype, hdrlen,  meshhdrlen = 0;
2454 	__le16 fc;
2455 	struct ieee80211_hdr hdr;
2456 	struct ieee80211s_hdr mesh_hdr __maybe_unused;
2457 	struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2458 	const u8 *encaps_data;
2459 	int encaps_len, skip_header_bytes;
2460 	bool wme_sta = false, authorized = false;
2461 	bool tdls_peer;
2462 	bool multicast;
2463 	u16 info_id = 0;
2464 	struct ieee80211_chanctx_conf *chanctx_conf;
2465 	struct ieee80211_sub_if_data *ap_sdata;
2466 	enum nl80211_band band;
2467 	int ret;
2468 
2469 	if (IS_ERR(sta))
2470 		sta = NULL;
2471 
2472 #ifdef CONFIG_MAC80211_DEBUGFS
2473 	if (local->force_tx_status)
2474 		info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2475 #endif
2476 
2477 	/* convert Ethernet header to proper 802.11 header (based on
2478 	 * operation mode) */
2479 	ethertype = (skb->data[12] << 8) | skb->data[13];
2480 	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2481 
2482 	switch (sdata->vif.type) {
2483 	case NL80211_IFTYPE_AP_VLAN:
2484 		if (sdata->wdev.use_4addr) {
2485 			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2486 			/* RA TA DA SA */
2487 			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2488 			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2489 			memcpy(hdr.addr3, skb->data, ETH_ALEN);
2490 			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2491 			hdrlen = 30;
2492 			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2493 			wme_sta = sta->sta.wme;
2494 		}
2495 		ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2496 					u.ap);
2497 		chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2498 		if (!chanctx_conf) {
2499 			ret = -ENOTCONN;
2500 			goto free;
2501 		}
2502 		band = chanctx_conf->def.chan->band;
2503 		if (sdata->wdev.use_4addr)
2504 			break;
2505 		/* fall through */
2506 	case NL80211_IFTYPE_AP:
2507 		if (sdata->vif.type == NL80211_IFTYPE_AP)
2508 			chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2509 		if (!chanctx_conf) {
2510 			ret = -ENOTCONN;
2511 			goto free;
2512 		}
2513 		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2514 		/* DA BSSID SA */
2515 		memcpy(hdr.addr1, skb->data, ETH_ALEN);
2516 		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2517 		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2518 		hdrlen = 24;
2519 		band = chanctx_conf->def.chan->band;
2520 		break;
2521 	case NL80211_IFTYPE_WDS:
2522 		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2523 		/* RA TA DA SA */
2524 		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2525 		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2526 		memcpy(hdr.addr3, skb->data, ETH_ALEN);
2527 		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2528 		hdrlen = 30;
2529 		/*
2530 		 * This is the exception! WDS style interfaces are prohibited
2531 		 * when channel contexts are in used so this must be valid
2532 		 */
2533 		band = local->hw.conf.chandef.chan->band;
2534 		break;
2535 #ifdef CONFIG_MAC80211_MESH
2536 	case NL80211_IFTYPE_MESH_POINT:
2537 		if (!is_multicast_ether_addr(skb->data)) {
2538 			struct sta_info *next_hop;
2539 			bool mpp_lookup = true;
2540 
2541 			mpath = mesh_path_lookup(sdata, skb->data);
2542 			if (mpath) {
2543 				mpp_lookup = false;
2544 				next_hop = rcu_dereference(mpath->next_hop);
2545 				if (!next_hop ||
2546 				    !(mpath->flags & (MESH_PATH_ACTIVE |
2547 						      MESH_PATH_RESOLVING)))
2548 					mpp_lookup = true;
2549 			}
2550 
2551 			if (mpp_lookup) {
2552 				mppath = mpp_path_lookup(sdata, skb->data);
2553 				if (mppath)
2554 					mppath->exp_time = jiffies;
2555 			}
2556 
2557 			if (mppath && mpath)
2558 				mesh_path_del(sdata, mpath->dst);
2559 		}
2560 
2561 		/*
2562 		 * Use address extension if it is a packet from
2563 		 * another interface or if we know the destination
2564 		 * is being proxied by a portal (i.e. portal address
2565 		 * differs from proxied address)
2566 		 */
2567 		if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2568 		    !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2569 			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2570 					skb->data, skb->data + ETH_ALEN);
2571 			meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2572 							       NULL, NULL);
2573 		} else {
2574 			/* DS -> MBSS (802.11-2012 13.11.3.3).
2575 			 * For unicast with unknown forwarding information,
2576 			 * destination might be in the MBSS or if that fails
2577 			 * forwarded to another mesh gate. In either case
2578 			 * resolution will be handled in ieee80211_xmit(), so
2579 			 * leave the original DA. This also works for mcast */
2580 			const u8 *mesh_da = skb->data;
2581 
2582 			if (mppath)
2583 				mesh_da = mppath->mpp;
2584 			else if (mpath)
2585 				mesh_da = mpath->dst;
2586 
2587 			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2588 					mesh_da, sdata->vif.addr);
2589 			if (is_multicast_ether_addr(mesh_da))
2590 				/* DA TA mSA AE:SA */
2591 				meshhdrlen = ieee80211_new_mesh_header(
2592 						sdata, &mesh_hdr,
2593 						skb->data + ETH_ALEN, NULL);
2594 			else
2595 				/* RA TA mDA mSA AE:DA SA */
2596 				meshhdrlen = ieee80211_new_mesh_header(
2597 						sdata, &mesh_hdr, skb->data,
2598 						skb->data + ETH_ALEN);
2599 
2600 		}
2601 		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2602 		if (!chanctx_conf) {
2603 			ret = -ENOTCONN;
2604 			goto free;
2605 		}
2606 		band = chanctx_conf->def.chan->band;
2607 
2608 		/* For injected frames, fill RA right away as nexthop lookup
2609 		 * will be skipped.
2610 		 */
2611 		if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) &&
2612 		    is_zero_ether_addr(hdr.addr1))
2613 			memcpy(hdr.addr1, skb->data, ETH_ALEN);
2614 		break;
2615 #endif
2616 	case NL80211_IFTYPE_STATION:
2617 		/* we already did checks when looking up the RA STA */
2618 		tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2619 
2620 		if (tdls_peer) {
2621 			/* DA SA BSSID */
2622 			memcpy(hdr.addr1, skb->data, ETH_ALEN);
2623 			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2624 			memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2625 			hdrlen = 24;
2626 		}  else if (sdata->u.mgd.use_4addr &&
2627 			    cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2628 			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2629 					  IEEE80211_FCTL_TODS);
2630 			/* RA TA DA SA */
2631 			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2632 			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2633 			memcpy(hdr.addr3, skb->data, ETH_ALEN);
2634 			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2635 			hdrlen = 30;
2636 		} else {
2637 			fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2638 			/* BSSID SA DA */
2639 			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2640 			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2641 			memcpy(hdr.addr3, skb->data, ETH_ALEN);
2642 			hdrlen = 24;
2643 		}
2644 		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2645 		if (!chanctx_conf) {
2646 			ret = -ENOTCONN;
2647 			goto free;
2648 		}
2649 		band = chanctx_conf->def.chan->band;
2650 		break;
2651 	case NL80211_IFTYPE_OCB:
2652 		/* DA SA BSSID */
2653 		memcpy(hdr.addr1, skb->data, ETH_ALEN);
2654 		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2655 		eth_broadcast_addr(hdr.addr3);
2656 		hdrlen = 24;
2657 		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2658 		if (!chanctx_conf) {
2659 			ret = -ENOTCONN;
2660 			goto free;
2661 		}
2662 		band = chanctx_conf->def.chan->band;
2663 		break;
2664 	case NL80211_IFTYPE_ADHOC:
2665 		/* DA SA BSSID */
2666 		memcpy(hdr.addr1, skb->data, ETH_ALEN);
2667 		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2668 		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2669 		hdrlen = 24;
2670 		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2671 		if (!chanctx_conf) {
2672 			ret = -ENOTCONN;
2673 			goto free;
2674 		}
2675 		band = chanctx_conf->def.chan->band;
2676 		break;
2677 	default:
2678 		ret = -EINVAL;
2679 		goto free;
2680 	}
2681 
2682 	multicast = is_multicast_ether_addr(hdr.addr1);
2683 
2684 	/* sta is always NULL for mesh */
2685 	if (sta) {
2686 		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2687 		wme_sta = sta->sta.wme;
2688 	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2689 		/* For mesh, the use of the QoS header is mandatory */
2690 		wme_sta = true;
2691 	}
2692 
2693 	/* receiver does QoS (which also means we do) use it */
2694 	if (wme_sta) {
2695 		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2696 		hdrlen += 2;
2697 	}
2698 
2699 	/*
2700 	 * Drop unicast frames to unauthorised stations unless they are
2701 	 * EAPOL frames from the local station.
2702 	 */
2703 	if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2704 		     (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2705 		     !multicast && !authorized &&
2706 		     (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2707 		      !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2708 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2709 		net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2710 				    sdata->name, hdr.addr1);
2711 #endif
2712 
2713 		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2714 
2715 		ret = -EPERM;
2716 		goto free;
2717 	}
2718 
2719 	if (unlikely(!multicast && skb->sk &&
2720 		     skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2721 		struct sk_buff *ack_skb = skb_clone_sk(skb);
2722 
2723 		if (ack_skb) {
2724 			unsigned long flags;
2725 			int id;
2726 
2727 			spin_lock_irqsave(&local->ack_status_lock, flags);
2728 			id = idr_alloc(&local->ack_status_frames, ack_skb,
2729 				       1, 0x10000, GFP_ATOMIC);
2730 			spin_unlock_irqrestore(&local->ack_status_lock, flags);
2731 
2732 			if (id >= 0) {
2733 				info_id = id;
2734 				info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2735 			} else {
2736 				kfree_skb(ack_skb);
2737 			}
2738 		}
2739 	}
2740 
2741 	/*
2742 	 * If the skb is shared we need to obtain our own copy.
2743 	 */
2744 	if (skb_shared(skb)) {
2745 		struct sk_buff *tmp_skb = skb;
2746 
2747 		/* can't happen -- skb is a clone if info_id != 0 */
2748 		WARN_ON(info_id);
2749 
2750 		skb = skb_clone(skb, GFP_ATOMIC);
2751 		kfree_skb(tmp_skb);
2752 
2753 		if (!skb) {
2754 			ret = -ENOMEM;
2755 			goto free;
2756 		}
2757 	}
2758 
2759 	hdr.frame_control = fc;
2760 	hdr.duration_id = 0;
2761 	hdr.seq_ctrl = 0;
2762 
2763 	skip_header_bytes = ETH_HLEN;
2764 	if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2765 		encaps_data = bridge_tunnel_header;
2766 		encaps_len = sizeof(bridge_tunnel_header);
2767 		skip_header_bytes -= 2;
2768 	} else if (ethertype >= ETH_P_802_3_MIN) {
2769 		encaps_data = rfc1042_header;
2770 		encaps_len = sizeof(rfc1042_header);
2771 		skip_header_bytes -= 2;
2772 	} else {
2773 		encaps_data = NULL;
2774 		encaps_len = 0;
2775 	}
2776 
2777 	skb_pull(skb, skip_header_bytes);
2778 	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2779 
2780 	/*
2781 	 * So we need to modify the skb header and hence need a copy of
2782 	 * that. The head_need variable above doesn't, so far, include
2783 	 * the needed header space that we don't need right away. If we
2784 	 * can, then we don't reallocate right now but only after the
2785 	 * frame arrives at the master device (if it does...)
2786 	 *
2787 	 * If we cannot, however, then we will reallocate to include all
2788 	 * the ever needed space. Also, if we need to reallocate it anyway,
2789 	 * make it big enough for everything we may ever need.
2790 	 */
2791 
2792 	if (head_need > 0 || skb_cloned(skb)) {
2793 		head_need += sdata->encrypt_headroom;
2794 		head_need += local->tx_headroom;
2795 		head_need = max_t(int, 0, head_need);
2796 		if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2797 			ieee80211_free_txskb(&local->hw, skb);
2798 			skb = NULL;
2799 			return ERR_PTR(-ENOMEM);
2800 		}
2801 	}
2802 
2803 	if (encaps_data)
2804 		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2805 
2806 #ifdef CONFIG_MAC80211_MESH
2807 	if (meshhdrlen > 0)
2808 		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2809 #endif
2810 
2811 	if (ieee80211_is_data_qos(fc)) {
2812 		__le16 *qos_control;
2813 
2814 		qos_control = skb_push(skb, 2);
2815 		memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2816 		/*
2817 		 * Maybe we could actually set some fields here, for now just
2818 		 * initialise to zero to indicate no special operation.
2819 		 */
2820 		*qos_control = 0;
2821 	} else
2822 		memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2823 
2824 	skb_reset_mac_header(skb);
2825 
2826 	info = IEEE80211_SKB_CB(skb);
2827 	memset(info, 0, sizeof(*info));
2828 
2829 	info->flags = info_flags;
2830 	info->ack_frame_id = info_id;
2831 	info->band = band;
2832 	info->control.flags = ctrl_flags;
2833 
2834 	return skb;
2835  free:
2836 	kfree_skb(skb);
2837 	return ERR_PTR(ret);
2838 }
2839 
2840 /*
2841  * fast-xmit overview
2842  *
2843  * The core idea of this fast-xmit is to remove per-packet checks by checking
2844  * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2845  * checks that are needed to get the sta->fast_tx pointer assigned, after which
2846  * much less work can be done per packet. For example, fragmentation must be
2847  * disabled or the fast_tx pointer will not be set. All the conditions are seen
2848  * in the code here.
2849  *
2850  * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2851  * header and other data to aid packet processing in ieee80211_xmit_fast().
2852  *
2853  * The most difficult part of this is that when any of these assumptions
2854  * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2855  * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2856  * since the per-packet code no longer checks the conditions. This is reflected
2857  * by the calls to these functions throughout the rest of the code, and must be
2858  * maintained if any of the TX path checks change.
2859  */
2860 
2861 void ieee80211_check_fast_xmit(struct sta_info *sta)
2862 {
2863 	struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2864 	struct ieee80211_local *local = sta->local;
2865 	struct ieee80211_sub_if_data *sdata = sta->sdata;
2866 	struct ieee80211_hdr *hdr = (void *)build.hdr;
2867 	struct ieee80211_chanctx_conf *chanctx_conf;
2868 	__le16 fc;
2869 
2870 	if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2871 		return;
2872 
2873 	/* Locking here protects both the pointer itself, and against concurrent
2874 	 * invocations winning data access races to, e.g., the key pointer that
2875 	 * is used.
2876 	 * Without it, the invocation of this function right after the key
2877 	 * pointer changes wouldn't be sufficient, as another CPU could access
2878 	 * the pointer, then stall, and then do the cache update after the CPU
2879 	 * that invalidated the key.
2880 	 * With the locking, such scenarios cannot happen as the check for the
2881 	 * key and the fast-tx assignment are done atomically, so the CPU that
2882 	 * modifies the key will either wait or other one will see the key
2883 	 * cleared/changed already.
2884 	 */
2885 	spin_lock_bh(&sta->lock);
2886 	if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2887 	    !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2888 	    sdata->vif.type == NL80211_IFTYPE_STATION)
2889 		goto out;
2890 
2891 	if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2892 		goto out;
2893 
2894 	if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2895 	    test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2896 	    test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2897 	    test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2898 		goto out;
2899 
2900 	if (sdata->noack_map)
2901 		goto out;
2902 
2903 	/* fast-xmit doesn't handle fragmentation at all */
2904 	if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2905 	    !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
2906 		goto out;
2907 
2908 	rcu_read_lock();
2909 	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2910 	if (!chanctx_conf) {
2911 		rcu_read_unlock();
2912 		goto out;
2913 	}
2914 	build.band = chanctx_conf->def.chan->band;
2915 	rcu_read_unlock();
2916 
2917 	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2918 
2919 	switch (sdata->vif.type) {
2920 	case NL80211_IFTYPE_ADHOC:
2921 		/* DA SA BSSID */
2922 		build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2923 		build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2924 		memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2925 		build.hdr_len = 24;
2926 		break;
2927 	case NL80211_IFTYPE_STATION:
2928 		if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2929 			/* DA SA BSSID */
2930 			build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2931 			build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2932 			memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2933 			build.hdr_len = 24;
2934 			break;
2935 		}
2936 
2937 		if (sdata->u.mgd.use_4addr) {
2938 			/* non-regular ethertype cannot use the fastpath */
2939 			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2940 					  IEEE80211_FCTL_TODS);
2941 			/* RA TA DA SA */
2942 			memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2943 			memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2944 			build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2945 			build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2946 			build.hdr_len = 30;
2947 			break;
2948 		}
2949 		fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2950 		/* BSSID SA DA */
2951 		memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2952 		build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2953 		build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2954 		build.hdr_len = 24;
2955 		break;
2956 	case NL80211_IFTYPE_AP_VLAN:
2957 		if (sdata->wdev.use_4addr) {
2958 			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2959 					  IEEE80211_FCTL_TODS);
2960 			/* RA TA DA SA */
2961 			memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2962 			memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2963 			build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2964 			build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2965 			build.hdr_len = 30;
2966 			break;
2967 		}
2968 		/* fall through */
2969 	case NL80211_IFTYPE_AP:
2970 		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2971 		/* DA BSSID SA */
2972 		build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2973 		memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2974 		build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2975 		build.hdr_len = 24;
2976 		break;
2977 	default:
2978 		/* not handled on fast-xmit */
2979 		goto out;
2980 	}
2981 
2982 	if (sta->sta.wme) {
2983 		build.hdr_len += 2;
2984 		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2985 	}
2986 
2987 	/* We store the key here so there's no point in using rcu_dereference()
2988 	 * but that's fine because the code that changes the pointers will call
2989 	 * this function after doing so. For a single CPU that would be enough,
2990 	 * for multiple see the comment above.
2991 	 */
2992 	build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2993 	if (!build.key)
2994 		build.key = rcu_access_pointer(sdata->default_unicast_key);
2995 	if (build.key) {
2996 		bool gen_iv, iv_spc, mmic;
2997 
2998 		gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2999 		iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
3000 		mmic = build.key->conf.flags &
3001 			(IEEE80211_KEY_FLAG_GENERATE_MMIC |
3002 			 IEEE80211_KEY_FLAG_PUT_MIC_SPACE);
3003 
3004 		/* don't handle software crypto */
3005 		if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
3006 			goto out;
3007 
3008 		/* Key is being removed */
3009 		if (build.key->flags & KEY_FLAG_TAINTED)
3010 			goto out;
3011 
3012 		switch (build.key->conf.cipher) {
3013 		case WLAN_CIPHER_SUITE_CCMP:
3014 		case WLAN_CIPHER_SUITE_CCMP_256:
3015 			if (gen_iv)
3016 				build.pn_offs = build.hdr_len;
3017 			if (gen_iv || iv_spc)
3018 				build.hdr_len += IEEE80211_CCMP_HDR_LEN;
3019 			break;
3020 		case WLAN_CIPHER_SUITE_GCMP:
3021 		case WLAN_CIPHER_SUITE_GCMP_256:
3022 			if (gen_iv)
3023 				build.pn_offs = build.hdr_len;
3024 			if (gen_iv || iv_spc)
3025 				build.hdr_len += IEEE80211_GCMP_HDR_LEN;
3026 			break;
3027 		case WLAN_CIPHER_SUITE_TKIP:
3028 			/* cannot handle MMIC or IV generation in xmit-fast */
3029 			if (mmic || gen_iv)
3030 				goto out;
3031 			if (iv_spc)
3032 				build.hdr_len += IEEE80211_TKIP_IV_LEN;
3033 			break;
3034 		case WLAN_CIPHER_SUITE_WEP40:
3035 		case WLAN_CIPHER_SUITE_WEP104:
3036 			/* cannot handle IV generation in fast-xmit */
3037 			if (gen_iv)
3038 				goto out;
3039 			if (iv_spc)
3040 				build.hdr_len += IEEE80211_WEP_IV_LEN;
3041 			break;
3042 		case WLAN_CIPHER_SUITE_AES_CMAC:
3043 		case WLAN_CIPHER_SUITE_BIP_CMAC_256:
3044 		case WLAN_CIPHER_SUITE_BIP_GMAC_128:
3045 		case WLAN_CIPHER_SUITE_BIP_GMAC_256:
3046 			WARN(1,
3047 			     "management cipher suite 0x%x enabled for data\n",
3048 			     build.key->conf.cipher);
3049 			goto out;
3050 		default:
3051 			/* we don't know how to generate IVs for this at all */
3052 			if (WARN_ON(gen_iv))
3053 				goto out;
3054 			/* pure hardware keys are OK, of course */
3055 			if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
3056 				break;
3057 			/* cipher scheme might require space allocation */
3058 			if (iv_spc &&
3059 			    build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
3060 				goto out;
3061 			if (iv_spc)
3062 				build.hdr_len += build.key->conf.iv_len;
3063 		}
3064 
3065 		fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
3066 	}
3067 
3068 	hdr->frame_control = fc;
3069 
3070 	memcpy(build.hdr + build.hdr_len,
3071 	       rfc1042_header,  sizeof(rfc1042_header));
3072 	build.hdr_len += sizeof(rfc1042_header);
3073 
3074 	fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
3075 	/* if the kmemdup fails, continue w/o fast_tx */
3076 	if (!fast_tx)
3077 		goto out;
3078 
3079  out:
3080 	/* we might have raced against another call to this function */
3081 	old = rcu_dereference_protected(sta->fast_tx,
3082 					lockdep_is_held(&sta->lock));
3083 	rcu_assign_pointer(sta->fast_tx, fast_tx);
3084 	if (old)
3085 		kfree_rcu(old, rcu_head);
3086 	spin_unlock_bh(&sta->lock);
3087 }
3088 
3089 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
3090 {
3091 	struct sta_info *sta;
3092 
3093 	rcu_read_lock();
3094 	list_for_each_entry_rcu(sta, &local->sta_list, list)
3095 		ieee80211_check_fast_xmit(sta);
3096 	rcu_read_unlock();
3097 }
3098 
3099 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
3100 {
3101 	struct ieee80211_local *local = sdata->local;
3102 	struct sta_info *sta;
3103 
3104 	rcu_read_lock();
3105 
3106 	list_for_each_entry_rcu(sta, &local->sta_list, list) {
3107 		if (sdata != sta->sdata &&
3108 		    (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3109 			continue;
3110 		ieee80211_check_fast_xmit(sta);
3111 	}
3112 
3113 	rcu_read_unlock();
3114 }
3115 
3116 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3117 {
3118 	struct ieee80211_fast_tx *fast_tx;
3119 
3120 	spin_lock_bh(&sta->lock);
3121 	fast_tx = rcu_dereference_protected(sta->fast_tx,
3122 					    lockdep_is_held(&sta->lock));
3123 	RCU_INIT_POINTER(sta->fast_tx, NULL);
3124 	spin_unlock_bh(&sta->lock);
3125 
3126 	if (fast_tx)
3127 		kfree_rcu(fast_tx, rcu_head);
3128 }
3129 
3130 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3131 					struct sk_buff *skb, int headroom)
3132 {
3133 	if (skb_headroom(skb) < headroom) {
3134 		I802_DEBUG_INC(local->tx_expand_skb_head);
3135 
3136 		if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
3137 			wiphy_debug(local->hw.wiphy,
3138 				    "failed to reallocate TX buffer\n");
3139 			return false;
3140 		}
3141 	}
3142 
3143 	return true;
3144 }
3145 
3146 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3147 					 struct ieee80211_fast_tx *fast_tx,
3148 					 struct sk_buff *skb)
3149 {
3150 	struct ieee80211_local *local = sdata->local;
3151 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3152 	struct ieee80211_hdr *hdr;
3153 	struct ethhdr *amsdu_hdr;
3154 	int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3155 	int subframe_len = skb->len - hdr_len;
3156 	void *data;
3157 	u8 *qc, *h_80211_src, *h_80211_dst;
3158 	const u8 *bssid;
3159 
3160 	if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3161 		return false;
3162 
3163 	if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3164 		return true;
3165 
3166 	if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr)))
3167 		return false;
3168 
3169 	data = skb_push(skb, sizeof(*amsdu_hdr));
3170 	memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3171 	hdr = data;
3172 	amsdu_hdr = data + hdr_len;
3173 	/* h_80211_src/dst is addr* field within hdr */
3174 	h_80211_src = data + fast_tx->sa_offs;
3175 	h_80211_dst = data + fast_tx->da_offs;
3176 
3177 	amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3178 	ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3179 	ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3180 
3181 	/* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3182 	 * fields needs to be changed to BSSID for A-MSDU frames depending
3183 	 * on FromDS/ToDS values.
3184 	 */
3185 	switch (sdata->vif.type) {
3186 	case NL80211_IFTYPE_STATION:
3187 		bssid = sdata->u.mgd.bssid;
3188 		break;
3189 	case NL80211_IFTYPE_AP:
3190 	case NL80211_IFTYPE_AP_VLAN:
3191 		bssid = sdata->vif.addr;
3192 		break;
3193 	default:
3194 		bssid = NULL;
3195 	}
3196 
3197 	if (bssid && ieee80211_has_fromds(hdr->frame_control))
3198 		ether_addr_copy(h_80211_src, bssid);
3199 
3200 	if (bssid && ieee80211_has_tods(hdr->frame_control))
3201 		ether_addr_copy(h_80211_dst, bssid);
3202 
3203 	qc = ieee80211_get_qos_ctl(hdr);
3204 	*qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3205 
3206 	info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3207 
3208 	return true;
3209 }
3210 
3211 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3212 				      struct sta_info *sta,
3213 				      struct ieee80211_fast_tx *fast_tx,
3214 				      struct sk_buff *skb)
3215 {
3216 	struct ieee80211_local *local = sdata->local;
3217 	struct fq *fq = &local->fq;
3218 	struct fq_tin *tin;
3219 	struct fq_flow *flow;
3220 	u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3221 	struct ieee80211_txq *txq = sta->sta.txq[tid];
3222 	struct txq_info *txqi;
3223 	struct sk_buff **frag_tail, *head;
3224 	int subframe_len = skb->len - ETH_ALEN;
3225 	u8 max_subframes = sta->sta.max_amsdu_subframes;
3226 	int max_frags = local->hw.max_tx_fragments;
3227 	int max_amsdu_len = sta->sta.max_amsdu_len;
3228 	int orig_truesize;
3229 	u32 flow_idx;
3230 	__be16 len;
3231 	void *data;
3232 	bool ret = false;
3233 	unsigned int orig_len;
3234 	int n = 2, nfrags, pad = 0;
3235 	u16 hdrlen;
3236 
3237 	if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3238 		return false;
3239 
3240 	if (skb_is_gso(skb))
3241 		return false;
3242 
3243 	if (!txq)
3244 		return false;
3245 
3246 	txqi = to_txq_info(txq);
3247 	if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3248 		return false;
3249 
3250 	if (sta->sta.max_rc_amsdu_len)
3251 		max_amsdu_len = min_t(int, max_amsdu_len,
3252 				      sta->sta.max_rc_amsdu_len);
3253 
3254 	if (sta->sta.max_tid_amsdu_len[tid])
3255 		max_amsdu_len = min_t(int, max_amsdu_len,
3256 				      sta->sta.max_tid_amsdu_len[tid]);
3257 
3258 	flow_idx = fq_flow_idx(fq, skb);
3259 
3260 	spin_lock_bh(&fq->lock);
3261 
3262 	/* TODO: Ideally aggregation should be done on dequeue to remain
3263 	 * responsive to environment changes.
3264 	 */
3265 
3266 	tin = &txqi->tin;
3267 	flow = fq_flow_classify(fq, tin, flow_idx, skb,
3268 				fq_flow_get_default_func);
3269 	head = skb_peek_tail(&flow->queue);
3270 	if (!head || skb_is_gso(head))
3271 		goto out;
3272 
3273 	orig_truesize = head->truesize;
3274 	orig_len = head->len;
3275 
3276 	if (skb->len + head->len > max_amsdu_len)
3277 		goto out;
3278 
3279 	nfrags = 1 + skb_shinfo(skb)->nr_frags;
3280 	nfrags += 1 + skb_shinfo(head)->nr_frags;
3281 	frag_tail = &skb_shinfo(head)->frag_list;
3282 	while (*frag_tail) {
3283 		nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3284 		frag_tail = &(*frag_tail)->next;
3285 		n++;
3286 	}
3287 
3288 	if (max_subframes && n > max_subframes)
3289 		goto out;
3290 
3291 	if (max_frags && nfrags > max_frags)
3292 		goto out;
3293 
3294 	if (!drv_can_aggregate_in_amsdu(local, head, skb))
3295 		goto out;
3296 
3297 	if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3298 		goto out;
3299 
3300 	/*
3301 	 * Pad out the previous subframe to a multiple of 4 by adding the
3302 	 * padding to the next one, that's being added. Note that head->len
3303 	 * is the length of the full A-MSDU, but that works since each time
3304 	 * we add a new subframe we pad out the previous one to a multiple
3305 	 * of 4 and thus it no longer matters in the next round.
3306 	 */
3307 	hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header);
3308 	if ((head->len - hdrlen) & 3)
3309 		pad = 4 - ((head->len - hdrlen) & 3);
3310 
3311 	if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) +
3312 						     2 + pad))
3313 		goto out_recalc;
3314 
3315 	ret = true;
3316 	data = skb_push(skb, ETH_ALEN + 2);
3317 	memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3318 
3319 	data += 2 * ETH_ALEN;
3320 	len = cpu_to_be16(subframe_len);
3321 	memcpy(data, &len, 2);
3322 	memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3323 
3324 	memset(skb_push(skb, pad), 0, pad);
3325 
3326 	head->len += skb->len;
3327 	head->data_len += skb->len;
3328 	*frag_tail = skb;
3329 
3330 out_recalc:
3331 	fq->memory_usage += head->truesize - orig_truesize;
3332 	if (head->len != orig_len) {
3333 		flow->backlog += head->len - orig_len;
3334 		tin->backlog_bytes += head->len - orig_len;
3335 
3336 		fq_recalc_backlog(fq, tin, flow);
3337 	}
3338 out:
3339 	spin_unlock_bh(&fq->lock);
3340 
3341 	return ret;
3342 }
3343 
3344 /*
3345  * Can be called while the sta lock is held. Anything that can cause packets to
3346  * be generated will cause deadlock!
3347  */
3348 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3349 				       struct sta_info *sta, u8 pn_offs,
3350 				       struct ieee80211_key *key,
3351 				       struct sk_buff *skb)
3352 {
3353 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3354 	struct ieee80211_hdr *hdr = (void *)skb->data;
3355 	u8 tid = IEEE80211_NUM_TIDS;
3356 
3357 	if (key)
3358 		info->control.hw_key = &key->conf;
3359 
3360 	ieee80211_tx_stats(skb->dev, skb->len);
3361 
3362 	if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3363 		tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3364 		hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3365 	} else {
3366 		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3367 		hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3368 		sdata->sequence_number += 0x10;
3369 	}
3370 
3371 	if (skb_shinfo(skb)->gso_size)
3372 		sta->tx_stats.msdu[tid] +=
3373 			DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3374 	else
3375 		sta->tx_stats.msdu[tid]++;
3376 
3377 	info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3378 
3379 	/* statistics normally done by ieee80211_tx_h_stats (but that
3380 	 * has to consider fragmentation, so is more complex)
3381 	 */
3382 	sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3383 	sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3384 
3385 	if (pn_offs) {
3386 		u64 pn;
3387 		u8 *crypto_hdr = skb->data + pn_offs;
3388 
3389 		switch (key->conf.cipher) {
3390 		case WLAN_CIPHER_SUITE_CCMP:
3391 		case WLAN_CIPHER_SUITE_CCMP_256:
3392 		case WLAN_CIPHER_SUITE_GCMP:
3393 		case WLAN_CIPHER_SUITE_GCMP_256:
3394 			pn = atomic64_inc_return(&key->conf.tx_pn);
3395 			crypto_hdr[0] = pn;
3396 			crypto_hdr[1] = pn >> 8;
3397 			crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6);
3398 			crypto_hdr[4] = pn >> 16;
3399 			crypto_hdr[5] = pn >> 24;
3400 			crypto_hdr[6] = pn >> 32;
3401 			crypto_hdr[7] = pn >> 40;
3402 			break;
3403 		}
3404 	}
3405 }
3406 
3407 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3408 				struct sta_info *sta,
3409 				struct ieee80211_fast_tx *fast_tx,
3410 				struct sk_buff *skb)
3411 {
3412 	struct ieee80211_local *local = sdata->local;
3413 	u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3414 	int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3415 	int hw_headroom = sdata->local->hw.extra_tx_headroom;
3416 	struct ethhdr eth;
3417 	struct ieee80211_tx_info *info;
3418 	struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3419 	struct ieee80211_tx_data tx;
3420 	ieee80211_tx_result r;
3421 	struct tid_ampdu_tx *tid_tx = NULL;
3422 	u8 tid = IEEE80211_NUM_TIDS;
3423 
3424 	/* control port protocol needs a lot of special handling */
3425 	if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3426 		return false;
3427 
3428 	/* only RFC 1042 SNAP */
3429 	if (ethertype < ETH_P_802_3_MIN)
3430 		return false;
3431 
3432 	/* don't handle TX status request here either */
3433 	if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3434 		return false;
3435 
3436 	if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3437 		tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3438 		tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3439 		if (tid_tx) {
3440 			if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3441 				return false;
3442 			if (tid_tx->timeout)
3443 				tid_tx->last_tx = jiffies;
3444 		}
3445 	}
3446 
3447 	/* after this point (skb is modified) we cannot return false */
3448 
3449 	if (skb_shared(skb)) {
3450 		struct sk_buff *tmp_skb = skb;
3451 
3452 		skb = skb_clone(skb, GFP_ATOMIC);
3453 		kfree_skb(tmp_skb);
3454 
3455 		if (!skb)
3456 			return true;
3457 	}
3458 
3459 	if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3460 	    ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3461 		return true;
3462 
3463 	/* will not be crypto-handled beyond what we do here, so use false
3464 	 * as the may-encrypt argument for the resize to not account for
3465 	 * more room than we already have in 'extra_head'
3466 	 */
3467 	if (unlikely(ieee80211_skb_resize(sdata, skb,
3468 					  max_t(int, extra_head + hw_headroom -
3469 						     skb_headroom(skb), 0),
3470 					  false))) {
3471 		kfree_skb(skb);
3472 		return true;
3473 	}
3474 
3475 	memcpy(&eth, skb->data, ETH_HLEN - 2);
3476 	hdr = skb_push(skb, extra_head);
3477 	memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3478 	memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3479 	memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3480 
3481 	info = IEEE80211_SKB_CB(skb);
3482 	memset(info, 0, sizeof(*info));
3483 	info->band = fast_tx->band;
3484 	info->control.vif = &sdata->vif;
3485 	info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3486 		      IEEE80211_TX_CTL_DONTFRAG |
3487 		      (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3488 	info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3489 
3490 #ifdef CONFIG_MAC80211_DEBUGFS
3491 	if (local->force_tx_status)
3492 		info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
3493 #endif
3494 
3495 	if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3496 		tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3497 		*ieee80211_get_qos_ctl(hdr) = tid;
3498 	}
3499 
3500 	__skb_queue_head_init(&tx.skbs);
3501 
3502 	tx.flags = IEEE80211_TX_UNICAST;
3503 	tx.local = local;
3504 	tx.sdata = sdata;
3505 	tx.sta = sta;
3506 	tx.key = fast_tx->key;
3507 
3508 	if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3509 		tx.skb = skb;
3510 		r = ieee80211_tx_h_rate_ctrl(&tx);
3511 		skb = tx.skb;
3512 		tx.skb = NULL;
3513 
3514 		if (r != TX_CONTINUE) {
3515 			if (r != TX_QUEUED)
3516 				kfree_skb(skb);
3517 			return true;
3518 		}
3519 	}
3520 
3521 	if (ieee80211_queue_skb(local, sdata, sta, skb))
3522 		return true;
3523 
3524 	ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3525 				   fast_tx->key, skb);
3526 
3527 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3528 		sdata = container_of(sdata->bss,
3529 				     struct ieee80211_sub_if_data, u.ap);
3530 
3531 	__skb_queue_tail(&tx.skbs, skb);
3532 	ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3533 	return true;
3534 }
3535 
3536 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3537 				     struct ieee80211_txq *txq)
3538 {
3539 	struct ieee80211_local *local = hw_to_local(hw);
3540 	struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3541 	struct ieee80211_hdr *hdr;
3542 	struct sk_buff *skb = NULL;
3543 	struct fq *fq = &local->fq;
3544 	struct fq_tin *tin = &txqi->tin;
3545 	struct ieee80211_tx_info *info;
3546 	struct ieee80211_tx_data tx;
3547 	ieee80211_tx_result r;
3548 	struct ieee80211_vif *vif = txq->vif;
3549 
3550 	WARN_ON_ONCE(softirq_count() == 0);
3551 
3552 begin:
3553 	spin_lock_bh(&fq->lock);
3554 
3555 	if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) ||
3556 	    test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags))
3557 		goto out;
3558 
3559 	if (vif->txqs_stopped[ieee80211_ac_from_tid(txq->tid)]) {
3560 		set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags);
3561 		goto out;
3562 	}
3563 
3564 	/* Make sure fragments stay together. */
3565 	skb = __skb_dequeue(&txqi->frags);
3566 	if (skb)
3567 		goto out;
3568 
3569 	skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3570 	if (!skb)
3571 		goto out;
3572 
3573 	spin_unlock_bh(&fq->lock);
3574 
3575 	hdr = (struct ieee80211_hdr *)skb->data;
3576 	info = IEEE80211_SKB_CB(skb);
3577 
3578 	memset(&tx, 0, sizeof(tx));
3579 	__skb_queue_head_init(&tx.skbs);
3580 	tx.local = local;
3581 	tx.skb = skb;
3582 	tx.sdata = vif_to_sdata(info->control.vif);
3583 
3584 	if (txq->sta)
3585 		tx.sta = container_of(txq->sta, struct sta_info, sta);
3586 
3587 	/*
3588 	 * The key can be removed while the packet was queued, so need to call
3589 	 * this here to get the current key.
3590 	 */
3591 	r = ieee80211_tx_h_select_key(&tx);
3592 	if (r != TX_CONTINUE) {
3593 		ieee80211_free_txskb(&local->hw, skb);
3594 		goto begin;
3595 	}
3596 
3597 	if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3598 		info->flags |= IEEE80211_TX_CTL_AMPDU;
3599 	else
3600 		info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3601 
3602 	if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3603 		struct sta_info *sta = container_of(txq->sta, struct sta_info,
3604 						    sta);
3605 		u8 pn_offs = 0;
3606 
3607 		if (tx.key &&
3608 		    (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3609 			pn_offs = ieee80211_hdrlen(hdr->frame_control);
3610 
3611 		ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3612 					   tx.key, skb);
3613 	} else {
3614 		if (invoke_tx_handlers_late(&tx))
3615 			goto begin;
3616 
3617 		skb = __skb_dequeue(&tx.skbs);
3618 
3619 		if (!skb_queue_empty(&tx.skbs)) {
3620 			spin_lock_bh(&fq->lock);
3621 			skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3622 			spin_unlock_bh(&fq->lock);
3623 		}
3624 	}
3625 
3626 	if (skb_has_frag_list(skb) &&
3627 	    !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3628 		if (skb_linearize(skb)) {
3629 			ieee80211_free_txskb(&local->hw, skb);
3630 			goto begin;
3631 		}
3632 	}
3633 
3634 	switch (tx.sdata->vif.type) {
3635 	case NL80211_IFTYPE_MONITOR:
3636 		if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
3637 			vif = &tx.sdata->vif;
3638 			break;
3639 		}
3640 		tx.sdata = rcu_dereference(local->monitor_sdata);
3641 		if (tx.sdata) {
3642 			vif = &tx.sdata->vif;
3643 			info->hw_queue =
3644 				vif->hw_queue[skb_get_queue_mapping(skb)];
3645 		} else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
3646 			ieee80211_free_txskb(&local->hw, skb);
3647 			goto begin;
3648 		} else {
3649 			vif = NULL;
3650 		}
3651 		break;
3652 	case NL80211_IFTYPE_AP_VLAN:
3653 		tx.sdata = container_of(tx.sdata->bss,
3654 					struct ieee80211_sub_if_data, u.ap);
3655 		/* fall through */
3656 	default:
3657 		vif = &tx.sdata->vif;
3658 		break;
3659 	}
3660 
3661 	IEEE80211_SKB_CB(skb)->control.vif = vif;
3662 	return skb;
3663 
3664 out:
3665 	spin_unlock_bh(&fq->lock);
3666 
3667 	return skb;
3668 }
3669 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3670 
3671 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac)
3672 {
3673 	struct ieee80211_local *local = hw_to_local(hw);
3674 	struct ieee80211_txq *ret = NULL;
3675 	struct txq_info *txqi = NULL;
3676 
3677 	spin_lock_bh(&local->active_txq_lock[ac]);
3678 
3679  begin:
3680 	txqi = list_first_entry_or_null(&local->active_txqs[ac],
3681 					struct txq_info,
3682 					schedule_order);
3683 	if (!txqi)
3684 		goto out;
3685 
3686 	if (txqi->txq.sta) {
3687 		struct sta_info *sta = container_of(txqi->txq.sta,
3688 						struct sta_info, sta);
3689 
3690 		if (sta->airtime[txqi->txq.ac].deficit < 0) {
3691 			sta->airtime[txqi->txq.ac].deficit +=
3692 				sta->airtime_weight;
3693 			list_move_tail(&txqi->schedule_order,
3694 				       &local->active_txqs[txqi->txq.ac]);
3695 			goto begin;
3696 		}
3697 	}
3698 
3699 
3700 	if (txqi->schedule_round == local->schedule_round[ac])
3701 		goto out;
3702 
3703 	list_del_init(&txqi->schedule_order);
3704 	txqi->schedule_round = local->schedule_round[ac];
3705 	ret = &txqi->txq;
3706 
3707 out:
3708 	spin_unlock_bh(&local->active_txq_lock[ac]);
3709 	return ret;
3710 }
3711 EXPORT_SYMBOL(ieee80211_next_txq);
3712 
3713 void __ieee80211_schedule_txq(struct ieee80211_hw *hw,
3714 			      struct ieee80211_txq *txq,
3715 			      bool force)
3716 {
3717 	struct ieee80211_local *local = hw_to_local(hw);
3718 	struct txq_info *txqi = to_txq_info(txq);
3719 
3720 	spin_lock_bh(&local->active_txq_lock[txq->ac]);
3721 
3722 	if (list_empty(&txqi->schedule_order) &&
3723 	    (force || !skb_queue_empty(&txqi->frags) ||
3724 	     txqi->tin.backlog_packets)) {
3725 		/* If airtime accounting is active, always enqueue STAs at the
3726 		 * head of the list to ensure that they only get moved to the
3727 		 * back by the airtime DRR scheduler once they have a negative
3728 		 * deficit. A station that already has a negative deficit will
3729 		 * get immediately moved to the back of the list on the next
3730 		 * call to ieee80211_next_txq().
3731 		 */
3732 		if (txqi->txq.sta &&
3733 		    wiphy_ext_feature_isset(local->hw.wiphy,
3734 					    NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
3735 			list_add(&txqi->schedule_order,
3736 				 &local->active_txqs[txq->ac]);
3737 		else
3738 			list_add_tail(&txqi->schedule_order,
3739 				      &local->active_txqs[txq->ac]);
3740 	}
3741 
3742 	spin_unlock_bh(&local->active_txq_lock[txq->ac]);
3743 }
3744 EXPORT_SYMBOL(__ieee80211_schedule_txq);
3745 
3746 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw,
3747 				struct ieee80211_txq *txq)
3748 {
3749 	struct ieee80211_local *local = hw_to_local(hw);
3750 	struct txq_info *iter, *tmp, *txqi = to_txq_info(txq);
3751 	struct sta_info *sta;
3752 	u8 ac = txq->ac;
3753 
3754 	spin_lock_bh(&local->active_txq_lock[ac]);
3755 
3756 	if (!txqi->txq.sta)
3757 		goto out;
3758 
3759 	if (list_empty(&txqi->schedule_order))
3760 		goto out;
3761 
3762 	list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac],
3763 				 schedule_order) {
3764 		if (iter == txqi)
3765 			break;
3766 
3767 		if (!iter->txq.sta) {
3768 			list_move_tail(&iter->schedule_order,
3769 				       &local->active_txqs[ac]);
3770 			continue;
3771 		}
3772 		sta = container_of(iter->txq.sta, struct sta_info, sta);
3773 		if (sta->airtime[ac].deficit < 0)
3774 			sta->airtime[ac].deficit += sta->airtime_weight;
3775 		list_move_tail(&iter->schedule_order, &local->active_txqs[ac]);
3776 	}
3777 
3778 	sta = container_of(txqi->txq.sta, struct sta_info, sta);
3779 	if (sta->airtime[ac].deficit >= 0)
3780 		goto out;
3781 
3782 	sta->airtime[ac].deficit += sta->airtime_weight;
3783 	list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]);
3784 	spin_unlock_bh(&local->active_txq_lock[ac]);
3785 
3786 	return false;
3787 out:
3788 	if (!list_empty(&txqi->schedule_order))
3789 		list_del_init(&txqi->schedule_order);
3790 	spin_unlock_bh(&local->active_txq_lock[ac]);
3791 
3792 	return true;
3793 }
3794 EXPORT_SYMBOL(ieee80211_txq_may_transmit);
3795 
3796 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac)
3797 {
3798 	struct ieee80211_local *local = hw_to_local(hw);
3799 
3800 	spin_lock_bh(&local->active_txq_lock[ac]);
3801 	local->schedule_round[ac]++;
3802 	spin_unlock_bh(&local->active_txq_lock[ac]);
3803 }
3804 EXPORT_SYMBOL(ieee80211_txq_schedule_start);
3805 
3806 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3807 				  struct net_device *dev,
3808 				  u32 info_flags,
3809 				  u32 ctrl_flags)
3810 {
3811 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3812 	struct ieee80211_local *local = sdata->local;
3813 	struct sta_info *sta;
3814 	struct sk_buff *next;
3815 
3816 	if (unlikely(skb->len < ETH_HLEN)) {
3817 		kfree_skb(skb);
3818 		return;
3819 	}
3820 
3821 	rcu_read_lock();
3822 
3823 	if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3824 		goto out_free;
3825 
3826 	if (IS_ERR(sta))
3827 		sta = NULL;
3828 
3829 	if (local->ops->wake_tx_queue) {
3830 		u16 queue = __ieee80211_select_queue(sdata, sta, skb);
3831 		skb_set_queue_mapping(skb, queue);
3832 	}
3833 
3834 	if (sta) {
3835 		struct ieee80211_fast_tx *fast_tx;
3836 
3837 		sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift);
3838 
3839 		fast_tx = rcu_dereference(sta->fast_tx);
3840 
3841 		if (fast_tx &&
3842 		    ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
3843 			goto out;
3844 	}
3845 
3846 	if (skb_is_gso(skb)) {
3847 		struct sk_buff *segs;
3848 
3849 		segs = skb_gso_segment(skb, 0);
3850 		if (IS_ERR(segs)) {
3851 			goto out_free;
3852 		} else if (segs) {
3853 			consume_skb(skb);
3854 			skb = segs;
3855 		}
3856 	} else {
3857 		/* we cannot process non-linear frames on this path */
3858 		if (skb_linearize(skb)) {
3859 			kfree_skb(skb);
3860 			goto out;
3861 		}
3862 
3863 		/* the frame could be fragmented, software-encrypted, and other
3864 		 * things so we cannot really handle checksum offload with it -
3865 		 * fix it up in software before we handle anything else.
3866 		 */
3867 		if (skb->ip_summed == CHECKSUM_PARTIAL) {
3868 			skb_set_transport_header(skb,
3869 						 skb_checksum_start_offset(skb));
3870 			if (skb_checksum_help(skb))
3871 				goto out_free;
3872 		}
3873 	}
3874 
3875 	next = skb;
3876 	while (next) {
3877 		skb = next;
3878 		next = skb->next;
3879 
3880 		skb->prev = NULL;
3881 		skb->next = NULL;
3882 
3883 		skb = ieee80211_build_hdr(sdata, skb, info_flags,
3884 					  sta, ctrl_flags);
3885 		if (IS_ERR(skb))
3886 			goto out;
3887 
3888 		ieee80211_tx_stats(dev, skb->len);
3889 
3890 		ieee80211_xmit(sdata, sta, skb, 0);
3891 	}
3892 	goto out;
3893  out_free:
3894 	kfree_skb(skb);
3895  out:
3896 	rcu_read_unlock();
3897 }
3898 
3899 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
3900 {
3901 	struct ethhdr *eth;
3902 	int err;
3903 
3904 	err = skb_ensure_writable(skb, ETH_HLEN);
3905 	if (unlikely(err))
3906 		return err;
3907 
3908 	eth = (void *)skb->data;
3909 	ether_addr_copy(eth->h_dest, sta->sta.addr);
3910 
3911 	return 0;
3912 }
3913 
3914 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
3915 					   struct net_device *dev)
3916 {
3917 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3918 	const struct ethhdr *eth = (void *)skb->data;
3919 	const struct vlan_ethhdr *ethvlan = (void *)skb->data;
3920 	__be16 ethertype;
3921 
3922 	if (likely(!is_multicast_ether_addr(eth->h_dest)))
3923 		return false;
3924 
3925 	switch (sdata->vif.type) {
3926 	case NL80211_IFTYPE_AP_VLAN:
3927 		if (sdata->u.vlan.sta)
3928 			return false;
3929 		if (sdata->wdev.use_4addr)
3930 			return false;
3931 		/* fall through */
3932 	case NL80211_IFTYPE_AP:
3933 		/* check runtime toggle for this bss */
3934 		if (!sdata->bss->multicast_to_unicast)
3935 			return false;
3936 		break;
3937 	default:
3938 		return false;
3939 	}
3940 
3941 	/* multicast to unicast conversion only for some payload */
3942 	ethertype = eth->h_proto;
3943 	if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
3944 		ethertype = ethvlan->h_vlan_encapsulated_proto;
3945 	switch (ethertype) {
3946 	case htons(ETH_P_ARP):
3947 	case htons(ETH_P_IP):
3948 	case htons(ETH_P_IPV6):
3949 		break;
3950 	default:
3951 		return false;
3952 	}
3953 
3954 	return true;
3955 }
3956 
3957 static void
3958 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
3959 			     struct sk_buff_head *queue)
3960 {
3961 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3962 	struct ieee80211_local *local = sdata->local;
3963 	const struct ethhdr *eth = (struct ethhdr *)skb->data;
3964 	struct sta_info *sta, *first = NULL;
3965 	struct sk_buff *cloned_skb;
3966 
3967 	rcu_read_lock();
3968 
3969 	list_for_each_entry_rcu(sta, &local->sta_list, list) {
3970 		if (sdata != sta->sdata)
3971 			/* AP-VLAN mismatch */
3972 			continue;
3973 		if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
3974 			/* do not send back to source */
3975 			continue;
3976 		if (!first) {
3977 			first = sta;
3978 			continue;
3979 		}
3980 		cloned_skb = skb_clone(skb, GFP_ATOMIC);
3981 		if (!cloned_skb)
3982 			goto multicast;
3983 		if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
3984 			dev_kfree_skb(cloned_skb);
3985 			goto multicast;
3986 		}
3987 		__skb_queue_tail(queue, cloned_skb);
3988 	}
3989 
3990 	if (likely(first)) {
3991 		if (unlikely(ieee80211_change_da(skb, first)))
3992 			goto multicast;
3993 		__skb_queue_tail(queue, skb);
3994 	} else {
3995 		/* no STA connected, drop */
3996 		kfree_skb(skb);
3997 		skb = NULL;
3998 	}
3999 
4000 	goto out;
4001 multicast:
4002 	__skb_queue_purge(queue);
4003 	__skb_queue_tail(queue, skb);
4004 out:
4005 	rcu_read_unlock();
4006 }
4007 
4008 /**
4009  * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
4010  * @skb: packet to be sent
4011  * @dev: incoming interface
4012  *
4013  * On failure skb will be freed.
4014  */
4015 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
4016 				       struct net_device *dev)
4017 {
4018 	if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
4019 		struct sk_buff_head queue;
4020 
4021 		__skb_queue_head_init(&queue);
4022 		ieee80211_convert_to_unicast(skb, dev, &queue);
4023 		while ((skb = __skb_dequeue(&queue)))
4024 			__ieee80211_subif_start_xmit(skb, dev, 0, 0);
4025 	} else {
4026 		__ieee80211_subif_start_xmit(skb, dev, 0, 0);
4027 	}
4028 
4029 	return NETDEV_TX_OK;
4030 }
4031 
4032 struct sk_buff *
4033 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
4034 			      struct sk_buff *skb, u32 info_flags)
4035 {
4036 	struct ieee80211_hdr *hdr;
4037 	struct ieee80211_tx_data tx = {
4038 		.local = sdata->local,
4039 		.sdata = sdata,
4040 	};
4041 	struct sta_info *sta;
4042 
4043 	rcu_read_lock();
4044 
4045 	if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
4046 		kfree_skb(skb);
4047 		skb = ERR_PTR(-EINVAL);
4048 		goto out;
4049 	}
4050 
4051 	skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0);
4052 	if (IS_ERR(skb))
4053 		goto out;
4054 
4055 	hdr = (void *)skb->data;
4056 	tx.sta = sta_info_get(sdata, hdr->addr1);
4057 	tx.skb = skb;
4058 
4059 	if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
4060 		rcu_read_unlock();
4061 		kfree_skb(skb);
4062 		return ERR_PTR(-EINVAL);
4063 	}
4064 
4065 out:
4066 	rcu_read_unlock();
4067 	return skb;
4068 }
4069 
4070 /*
4071  * ieee80211_clear_tx_pending may not be called in a context where
4072  * it is possible that it packets could come in again.
4073  */
4074 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
4075 {
4076 	struct sk_buff *skb;
4077 	int i;
4078 
4079 	for (i = 0; i < local->hw.queues; i++) {
4080 		while ((skb = skb_dequeue(&local->pending[i])) != NULL)
4081 			ieee80211_free_txskb(&local->hw, skb);
4082 	}
4083 }
4084 
4085 /*
4086  * Returns false if the frame couldn't be transmitted but was queued instead,
4087  * which in this case means re-queued -- take as an indication to stop sending
4088  * more pending frames.
4089  */
4090 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
4091 				     struct sk_buff *skb)
4092 {
4093 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4094 	struct ieee80211_sub_if_data *sdata;
4095 	struct sta_info *sta;
4096 	struct ieee80211_hdr *hdr;
4097 	bool result;
4098 	struct ieee80211_chanctx_conf *chanctx_conf;
4099 
4100 	sdata = vif_to_sdata(info->control.vif);
4101 
4102 	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
4103 		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4104 		if (unlikely(!chanctx_conf)) {
4105 			dev_kfree_skb(skb);
4106 			return true;
4107 		}
4108 		info->band = chanctx_conf->def.chan->band;
4109 		result = ieee80211_tx(sdata, NULL, skb, true, 0);
4110 	} else {
4111 		struct sk_buff_head skbs;
4112 
4113 		__skb_queue_head_init(&skbs);
4114 		__skb_queue_tail(&skbs, skb);
4115 
4116 		hdr = (struct ieee80211_hdr *)skb->data;
4117 		sta = sta_info_get(sdata, hdr->addr1);
4118 
4119 		result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
4120 	}
4121 
4122 	return result;
4123 }
4124 
4125 /*
4126  * Transmit all pending packets. Called from tasklet.
4127  */
4128 void ieee80211_tx_pending(unsigned long data)
4129 {
4130 	struct ieee80211_local *local = (struct ieee80211_local *)data;
4131 	unsigned long flags;
4132 	int i;
4133 	bool txok;
4134 
4135 	rcu_read_lock();
4136 
4137 	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
4138 	for (i = 0; i < local->hw.queues; i++) {
4139 		/*
4140 		 * If queue is stopped by something other than due to pending
4141 		 * frames, or we have no pending frames, proceed to next queue.
4142 		 */
4143 		if (local->queue_stop_reasons[i] ||
4144 		    skb_queue_empty(&local->pending[i]))
4145 			continue;
4146 
4147 		while (!skb_queue_empty(&local->pending[i])) {
4148 			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
4149 			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4150 
4151 			if (WARN_ON(!info->control.vif)) {
4152 				ieee80211_free_txskb(&local->hw, skb);
4153 				continue;
4154 			}
4155 
4156 			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
4157 						flags);
4158 
4159 			txok = ieee80211_tx_pending_skb(local, skb);
4160 			spin_lock_irqsave(&local->queue_stop_reason_lock,
4161 					  flags);
4162 			if (!txok)
4163 				break;
4164 		}
4165 
4166 		if (skb_queue_empty(&local->pending[i]))
4167 			ieee80211_propagate_queue_wake(local, i);
4168 	}
4169 	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
4170 
4171 	rcu_read_unlock();
4172 }
4173 
4174 /* functions for drivers to get certain frames */
4175 
4176 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4177 				       struct ps_data *ps, struct sk_buff *skb,
4178 				       bool is_template)
4179 {
4180 	u8 *pos, *tim;
4181 	int aid0 = 0;
4182 	int i, have_bits = 0, n1, n2;
4183 
4184 	/* Generate bitmap for TIM only if there are any STAs in power save
4185 	 * mode. */
4186 	if (atomic_read(&ps->num_sta_ps) > 0)
4187 		/* in the hope that this is faster than
4188 		 * checking byte-for-byte */
4189 		have_bits = !bitmap_empty((unsigned long *)ps->tim,
4190 					  IEEE80211_MAX_AID+1);
4191 	if (!is_template) {
4192 		if (ps->dtim_count == 0)
4193 			ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
4194 		else
4195 			ps->dtim_count--;
4196 	}
4197 
4198 	tim = pos = skb_put(skb, 6);
4199 	*pos++ = WLAN_EID_TIM;
4200 	*pos++ = 4;
4201 	*pos++ = ps->dtim_count;
4202 	*pos++ = sdata->vif.bss_conf.dtim_period;
4203 
4204 	if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
4205 		aid0 = 1;
4206 
4207 	ps->dtim_bc_mc = aid0 == 1;
4208 
4209 	if (have_bits) {
4210 		/* Find largest even number N1 so that bits numbered 1 through
4211 		 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
4212 		 * (N2 + 1) x 8 through 2007 are 0. */
4213 		n1 = 0;
4214 		for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
4215 			if (ps->tim[i]) {
4216 				n1 = i & 0xfe;
4217 				break;
4218 			}
4219 		}
4220 		n2 = n1;
4221 		for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
4222 			if (ps->tim[i]) {
4223 				n2 = i;
4224 				break;
4225 			}
4226 		}
4227 
4228 		/* Bitmap control */
4229 		*pos++ = n1 | aid0;
4230 		/* Part Virt Bitmap */
4231 		skb_put(skb, n2 - n1);
4232 		memcpy(pos, ps->tim + n1, n2 - n1 + 1);
4233 
4234 		tim[1] = n2 - n1 + 4;
4235 	} else {
4236 		*pos++ = aid0; /* Bitmap control */
4237 		*pos++ = 0; /* Part Virt Bitmap */
4238 	}
4239 }
4240 
4241 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4242 				    struct ps_data *ps, struct sk_buff *skb,
4243 				    bool is_template)
4244 {
4245 	struct ieee80211_local *local = sdata->local;
4246 
4247 	/*
4248 	 * Not very nice, but we want to allow the driver to call
4249 	 * ieee80211_beacon_get() as a response to the set_tim()
4250 	 * callback. That, however, is already invoked under the
4251 	 * sta_lock to guarantee consistent and race-free update
4252 	 * of the tim bitmap in mac80211 and the driver.
4253 	 */
4254 	if (local->tim_in_locked_section) {
4255 		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4256 	} else {
4257 		spin_lock_bh(&local->tim_lock);
4258 		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4259 		spin_unlock_bh(&local->tim_lock);
4260 	}
4261 
4262 	return 0;
4263 }
4264 
4265 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
4266 			      struct beacon_data *beacon)
4267 {
4268 	struct probe_resp *resp;
4269 	u8 *beacon_data;
4270 	size_t beacon_data_len;
4271 	int i;
4272 	u8 count = beacon->csa_current_counter;
4273 
4274 	switch (sdata->vif.type) {
4275 	case NL80211_IFTYPE_AP:
4276 		beacon_data = beacon->tail;
4277 		beacon_data_len = beacon->tail_len;
4278 		break;
4279 	case NL80211_IFTYPE_ADHOC:
4280 		beacon_data = beacon->head;
4281 		beacon_data_len = beacon->head_len;
4282 		break;
4283 	case NL80211_IFTYPE_MESH_POINT:
4284 		beacon_data = beacon->head;
4285 		beacon_data_len = beacon->head_len;
4286 		break;
4287 	default:
4288 		return;
4289 	}
4290 
4291 	rcu_read_lock();
4292 	for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
4293 		resp = rcu_dereference(sdata->u.ap.probe_resp);
4294 
4295 		if (beacon->csa_counter_offsets[i]) {
4296 			if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
4297 					 beacon_data_len)) {
4298 				rcu_read_unlock();
4299 				return;
4300 			}
4301 
4302 			beacon_data[beacon->csa_counter_offsets[i]] = count;
4303 		}
4304 
4305 		if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
4306 			resp->data[resp->csa_counter_offsets[i]] = count;
4307 	}
4308 	rcu_read_unlock();
4309 }
4310 
4311 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
4312 {
4313 	beacon->csa_current_counter--;
4314 
4315 	/* the counter should never reach 0 */
4316 	WARN_ON_ONCE(!beacon->csa_current_counter);
4317 
4318 	return beacon->csa_current_counter;
4319 }
4320 
4321 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
4322 {
4323 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4324 	struct beacon_data *beacon = NULL;
4325 	u8 count = 0;
4326 
4327 	rcu_read_lock();
4328 
4329 	if (sdata->vif.type == NL80211_IFTYPE_AP)
4330 		beacon = rcu_dereference(sdata->u.ap.beacon);
4331 	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4332 		beacon = rcu_dereference(sdata->u.ibss.presp);
4333 	else if (ieee80211_vif_is_mesh(&sdata->vif))
4334 		beacon = rcu_dereference(sdata->u.mesh.beacon);
4335 
4336 	if (!beacon)
4337 		goto unlock;
4338 
4339 	count = __ieee80211_csa_update_counter(beacon);
4340 
4341 unlock:
4342 	rcu_read_unlock();
4343 	return count;
4344 }
4345 EXPORT_SYMBOL(ieee80211_csa_update_counter);
4346 
4347 void ieee80211_csa_set_counter(struct ieee80211_vif *vif, u8 counter)
4348 {
4349 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4350 	struct beacon_data *beacon = NULL;
4351 
4352 	rcu_read_lock();
4353 
4354 	if (sdata->vif.type == NL80211_IFTYPE_AP)
4355 		beacon = rcu_dereference(sdata->u.ap.beacon);
4356 	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4357 		beacon = rcu_dereference(sdata->u.ibss.presp);
4358 	else if (ieee80211_vif_is_mesh(&sdata->vif))
4359 		beacon = rcu_dereference(sdata->u.mesh.beacon);
4360 
4361 	if (!beacon)
4362 		goto unlock;
4363 
4364 	if (counter < beacon->csa_current_counter)
4365 		beacon->csa_current_counter = counter;
4366 
4367 unlock:
4368 	rcu_read_unlock();
4369 }
4370 EXPORT_SYMBOL(ieee80211_csa_set_counter);
4371 
4372 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
4373 {
4374 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4375 	struct beacon_data *beacon = NULL;
4376 	u8 *beacon_data;
4377 	size_t beacon_data_len;
4378 	int ret = false;
4379 
4380 	if (!ieee80211_sdata_running(sdata))
4381 		return false;
4382 
4383 	rcu_read_lock();
4384 	if (vif->type == NL80211_IFTYPE_AP) {
4385 		struct ieee80211_if_ap *ap = &sdata->u.ap;
4386 
4387 		beacon = rcu_dereference(ap->beacon);
4388 		if (WARN_ON(!beacon || !beacon->tail))
4389 			goto out;
4390 		beacon_data = beacon->tail;
4391 		beacon_data_len = beacon->tail_len;
4392 	} else if (vif->type == NL80211_IFTYPE_ADHOC) {
4393 		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4394 
4395 		beacon = rcu_dereference(ifibss->presp);
4396 		if (!beacon)
4397 			goto out;
4398 
4399 		beacon_data = beacon->head;
4400 		beacon_data_len = beacon->head_len;
4401 	} else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
4402 		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4403 
4404 		beacon = rcu_dereference(ifmsh->beacon);
4405 		if (!beacon)
4406 			goto out;
4407 
4408 		beacon_data = beacon->head;
4409 		beacon_data_len = beacon->head_len;
4410 	} else {
4411 		WARN_ON(1);
4412 		goto out;
4413 	}
4414 
4415 	if (!beacon->csa_counter_offsets[0])
4416 		goto out;
4417 
4418 	if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
4419 		goto out;
4420 
4421 	if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
4422 		ret = true;
4423  out:
4424 	rcu_read_unlock();
4425 
4426 	return ret;
4427 }
4428 EXPORT_SYMBOL(ieee80211_csa_is_complete);
4429 
4430 static struct sk_buff *
4431 __ieee80211_beacon_get(struct ieee80211_hw *hw,
4432 		       struct ieee80211_vif *vif,
4433 		       struct ieee80211_mutable_offsets *offs,
4434 		       bool is_template)
4435 {
4436 	struct ieee80211_local *local = hw_to_local(hw);
4437 	struct beacon_data *beacon = NULL;
4438 	struct sk_buff *skb = NULL;
4439 	struct ieee80211_tx_info *info;
4440 	struct ieee80211_sub_if_data *sdata = NULL;
4441 	enum nl80211_band band;
4442 	struct ieee80211_tx_rate_control txrc;
4443 	struct ieee80211_chanctx_conf *chanctx_conf;
4444 	int csa_off_base = 0;
4445 
4446 	rcu_read_lock();
4447 
4448 	sdata = vif_to_sdata(vif);
4449 	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4450 
4451 	if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
4452 		goto out;
4453 
4454 	if (offs)
4455 		memset(offs, 0, sizeof(*offs));
4456 
4457 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
4458 		struct ieee80211_if_ap *ap = &sdata->u.ap;
4459 
4460 		beacon = rcu_dereference(ap->beacon);
4461 		if (beacon) {
4462 			if (beacon->csa_counter_offsets[0]) {
4463 				if (!is_template)
4464 					__ieee80211_csa_update_counter(beacon);
4465 
4466 				ieee80211_set_csa(sdata, beacon);
4467 			}
4468 
4469 			/*
4470 			 * headroom, head length,
4471 			 * tail length and maximum TIM length
4472 			 */
4473 			skb = dev_alloc_skb(local->tx_headroom +
4474 					    beacon->head_len +
4475 					    beacon->tail_len + 256 +
4476 					    local->hw.extra_beacon_tailroom);
4477 			if (!skb)
4478 				goto out;
4479 
4480 			skb_reserve(skb, local->tx_headroom);
4481 			skb_put_data(skb, beacon->head, beacon->head_len);
4482 
4483 			ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4484 						 is_template);
4485 
4486 			if (offs) {
4487 				offs->tim_offset = beacon->head_len;
4488 				offs->tim_length = skb->len - beacon->head_len;
4489 
4490 				/* for AP the csa offsets are from tail */
4491 				csa_off_base = skb->len;
4492 			}
4493 
4494 			if (beacon->tail)
4495 				skb_put_data(skb, beacon->tail,
4496 					     beacon->tail_len);
4497 		} else
4498 			goto out;
4499 	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
4500 		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4501 		struct ieee80211_hdr *hdr;
4502 
4503 		beacon = rcu_dereference(ifibss->presp);
4504 		if (!beacon)
4505 			goto out;
4506 
4507 		if (beacon->csa_counter_offsets[0]) {
4508 			if (!is_template)
4509 				__ieee80211_csa_update_counter(beacon);
4510 
4511 			ieee80211_set_csa(sdata, beacon);
4512 		}
4513 
4514 		skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
4515 				    local->hw.extra_beacon_tailroom);
4516 		if (!skb)
4517 			goto out;
4518 		skb_reserve(skb, local->tx_headroom);
4519 		skb_put_data(skb, beacon->head, beacon->head_len);
4520 
4521 		hdr = (struct ieee80211_hdr *) skb->data;
4522 		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4523 						 IEEE80211_STYPE_BEACON);
4524 	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4525 		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4526 
4527 		beacon = rcu_dereference(ifmsh->beacon);
4528 		if (!beacon)
4529 			goto out;
4530 
4531 		if (beacon->csa_counter_offsets[0]) {
4532 			if (!is_template)
4533 				/* TODO: For mesh csa_counter is in TU, so
4534 				 * decrementing it by one isn't correct, but
4535 				 * for now we leave it consistent with overall
4536 				 * mac80211's behavior.
4537 				 */
4538 				__ieee80211_csa_update_counter(beacon);
4539 
4540 			ieee80211_set_csa(sdata, beacon);
4541 		}
4542 
4543 		if (ifmsh->sync_ops)
4544 			ifmsh->sync_ops->adjust_tsf(sdata, beacon);
4545 
4546 		skb = dev_alloc_skb(local->tx_headroom +
4547 				    beacon->head_len +
4548 				    256 + /* TIM IE */
4549 				    beacon->tail_len +
4550 				    local->hw.extra_beacon_tailroom);
4551 		if (!skb)
4552 			goto out;
4553 		skb_reserve(skb, local->tx_headroom);
4554 		skb_put_data(skb, beacon->head, beacon->head_len);
4555 		ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4556 
4557 		if (offs) {
4558 			offs->tim_offset = beacon->head_len;
4559 			offs->tim_length = skb->len - beacon->head_len;
4560 		}
4561 
4562 		skb_put_data(skb, beacon->tail, beacon->tail_len);
4563 	} else {
4564 		WARN_ON(1);
4565 		goto out;
4566 	}
4567 
4568 	/* CSA offsets */
4569 	if (offs && beacon) {
4570 		int i;
4571 
4572 		for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
4573 			u16 csa_off = beacon->csa_counter_offsets[i];
4574 
4575 			if (!csa_off)
4576 				continue;
4577 
4578 			offs->csa_counter_offs[i] = csa_off_base + csa_off;
4579 		}
4580 	}
4581 
4582 	band = chanctx_conf->def.chan->band;
4583 
4584 	info = IEEE80211_SKB_CB(skb);
4585 
4586 	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4587 	info->flags |= IEEE80211_TX_CTL_NO_ACK;
4588 	info->band = band;
4589 
4590 	memset(&txrc, 0, sizeof(txrc));
4591 	txrc.hw = hw;
4592 	txrc.sband = local->hw.wiphy->bands[band];
4593 	txrc.bss_conf = &sdata->vif.bss_conf;
4594 	txrc.skb = skb;
4595 	txrc.reported_rate.idx = -1;
4596 	txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
4597 	txrc.bss = true;
4598 	rate_control_get_rate(sdata, NULL, &txrc);
4599 
4600 	info->control.vif = vif;
4601 
4602 	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4603 			IEEE80211_TX_CTL_ASSIGN_SEQ |
4604 			IEEE80211_TX_CTL_FIRST_FRAGMENT;
4605  out:
4606 	rcu_read_unlock();
4607 	return skb;
4608 
4609 }
4610 
4611 struct sk_buff *
4612 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4613 			      struct ieee80211_vif *vif,
4614 			      struct ieee80211_mutable_offsets *offs)
4615 {
4616 	return __ieee80211_beacon_get(hw, vif, offs, true);
4617 }
4618 EXPORT_SYMBOL(ieee80211_beacon_get_template);
4619 
4620 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4621 					 struct ieee80211_vif *vif,
4622 					 u16 *tim_offset, u16 *tim_length)
4623 {
4624 	struct ieee80211_mutable_offsets offs = {};
4625 	struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
4626 	struct sk_buff *copy;
4627 	struct ieee80211_supported_band *sband;
4628 	int shift;
4629 
4630 	if (!bcn)
4631 		return bcn;
4632 
4633 	if (tim_offset)
4634 		*tim_offset = offs.tim_offset;
4635 
4636 	if (tim_length)
4637 		*tim_length = offs.tim_length;
4638 
4639 	if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4640 	    !hw_to_local(hw)->monitors)
4641 		return bcn;
4642 
4643 	/* send a copy to monitor interfaces */
4644 	copy = skb_copy(bcn, GFP_ATOMIC);
4645 	if (!copy)
4646 		return bcn;
4647 
4648 	shift = ieee80211_vif_get_shift(vif);
4649 	sband = ieee80211_get_sband(vif_to_sdata(vif));
4650 	if (!sband)
4651 		return bcn;
4652 
4653 	ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false,
4654 			     NULL);
4655 
4656 	return bcn;
4657 }
4658 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4659 
4660 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4661 					struct ieee80211_vif *vif)
4662 {
4663 	struct ieee80211_if_ap *ap = NULL;
4664 	struct sk_buff *skb = NULL;
4665 	struct probe_resp *presp = NULL;
4666 	struct ieee80211_hdr *hdr;
4667 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4668 
4669 	if (sdata->vif.type != NL80211_IFTYPE_AP)
4670 		return NULL;
4671 
4672 	rcu_read_lock();
4673 
4674 	ap = &sdata->u.ap;
4675 	presp = rcu_dereference(ap->probe_resp);
4676 	if (!presp)
4677 		goto out;
4678 
4679 	skb = dev_alloc_skb(presp->len);
4680 	if (!skb)
4681 		goto out;
4682 
4683 	skb_put_data(skb, presp->data, presp->len);
4684 
4685 	hdr = (struct ieee80211_hdr *) skb->data;
4686 	memset(hdr->addr1, 0, sizeof(hdr->addr1));
4687 
4688 out:
4689 	rcu_read_unlock();
4690 	return skb;
4691 }
4692 EXPORT_SYMBOL(ieee80211_proberesp_get);
4693 
4694 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4695 				     struct ieee80211_vif *vif)
4696 {
4697 	struct ieee80211_sub_if_data *sdata;
4698 	struct ieee80211_if_managed *ifmgd;
4699 	struct ieee80211_pspoll *pspoll;
4700 	struct ieee80211_local *local;
4701 	struct sk_buff *skb;
4702 
4703 	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4704 		return NULL;
4705 
4706 	sdata = vif_to_sdata(vif);
4707 	ifmgd = &sdata->u.mgd;
4708 	local = sdata->local;
4709 
4710 	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4711 	if (!skb)
4712 		return NULL;
4713 
4714 	skb_reserve(skb, local->hw.extra_tx_headroom);
4715 
4716 	pspoll = skb_put_zero(skb, sizeof(*pspoll));
4717 	pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4718 					    IEEE80211_STYPE_PSPOLL);
4719 	pspoll->aid = cpu_to_le16(ifmgd->aid);
4720 
4721 	/* aid in PS-Poll has its two MSBs each set to 1 */
4722 	pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4723 
4724 	memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4725 	memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4726 
4727 	return skb;
4728 }
4729 EXPORT_SYMBOL(ieee80211_pspoll_get);
4730 
4731 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4732 				       struct ieee80211_vif *vif,
4733 				       bool qos_ok)
4734 {
4735 	struct ieee80211_hdr_3addr *nullfunc;
4736 	struct ieee80211_sub_if_data *sdata;
4737 	struct ieee80211_if_managed *ifmgd;
4738 	struct ieee80211_local *local;
4739 	struct sk_buff *skb;
4740 	bool qos = false;
4741 
4742 	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4743 		return NULL;
4744 
4745 	sdata = vif_to_sdata(vif);
4746 	ifmgd = &sdata->u.mgd;
4747 	local = sdata->local;
4748 
4749 	if (qos_ok) {
4750 		struct sta_info *sta;
4751 
4752 		rcu_read_lock();
4753 		sta = sta_info_get(sdata, ifmgd->bssid);
4754 		qos = sta && sta->sta.wme;
4755 		rcu_read_unlock();
4756 	}
4757 
4758 	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
4759 			    sizeof(*nullfunc) + 2);
4760 	if (!skb)
4761 		return NULL;
4762 
4763 	skb_reserve(skb, local->hw.extra_tx_headroom);
4764 
4765 	nullfunc = skb_put_zero(skb, sizeof(*nullfunc));
4766 	nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4767 					      IEEE80211_STYPE_NULLFUNC |
4768 					      IEEE80211_FCTL_TODS);
4769 	if (qos) {
4770 		__le16 qoshdr = cpu_to_le16(7);
4771 
4772 		BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC |
4773 			      IEEE80211_STYPE_NULLFUNC) !=
4774 			     IEEE80211_STYPE_QOS_NULLFUNC);
4775 		nullfunc->frame_control |=
4776 			cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC);
4777 		skb->priority = 7;
4778 		skb_set_queue_mapping(skb, IEEE80211_AC_VO);
4779 		skb_put_data(skb, &qoshdr, sizeof(qoshdr));
4780 	}
4781 
4782 	memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4783 	memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4784 	memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4785 
4786 	return skb;
4787 }
4788 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4789 
4790 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4791 				       const u8 *src_addr,
4792 				       const u8 *ssid, size_t ssid_len,
4793 				       size_t tailroom)
4794 {
4795 	struct ieee80211_local *local = hw_to_local(hw);
4796 	struct ieee80211_hdr_3addr *hdr;
4797 	struct sk_buff *skb;
4798 	size_t ie_ssid_len;
4799 	u8 *pos;
4800 
4801 	ie_ssid_len = 2 + ssid_len;
4802 
4803 	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4804 			    ie_ssid_len + tailroom);
4805 	if (!skb)
4806 		return NULL;
4807 
4808 	skb_reserve(skb, local->hw.extra_tx_headroom);
4809 
4810 	hdr = skb_put_zero(skb, sizeof(*hdr));
4811 	hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4812 					 IEEE80211_STYPE_PROBE_REQ);
4813 	eth_broadcast_addr(hdr->addr1);
4814 	memcpy(hdr->addr2, src_addr, ETH_ALEN);
4815 	eth_broadcast_addr(hdr->addr3);
4816 
4817 	pos = skb_put(skb, ie_ssid_len);
4818 	*pos++ = WLAN_EID_SSID;
4819 	*pos++ = ssid_len;
4820 	if (ssid_len)
4821 		memcpy(pos, ssid, ssid_len);
4822 	pos += ssid_len;
4823 
4824 	return skb;
4825 }
4826 EXPORT_SYMBOL(ieee80211_probereq_get);
4827 
4828 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4829 		       const void *frame, size_t frame_len,
4830 		       const struct ieee80211_tx_info *frame_txctl,
4831 		       struct ieee80211_rts *rts)
4832 {
4833 	const struct ieee80211_hdr *hdr = frame;
4834 
4835 	rts->frame_control =
4836 	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4837 	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4838 					       frame_txctl);
4839 	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4840 	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4841 }
4842 EXPORT_SYMBOL(ieee80211_rts_get);
4843 
4844 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4845 			     const void *frame, size_t frame_len,
4846 			     const struct ieee80211_tx_info *frame_txctl,
4847 			     struct ieee80211_cts *cts)
4848 {
4849 	const struct ieee80211_hdr *hdr = frame;
4850 
4851 	cts->frame_control =
4852 	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4853 	cts->duration = ieee80211_ctstoself_duration(hw, vif,
4854 						     frame_len, frame_txctl);
4855 	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4856 }
4857 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4858 
4859 struct sk_buff *
4860 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4861 			  struct ieee80211_vif *vif)
4862 {
4863 	struct ieee80211_local *local = hw_to_local(hw);
4864 	struct sk_buff *skb = NULL;
4865 	struct ieee80211_tx_data tx;
4866 	struct ieee80211_sub_if_data *sdata;
4867 	struct ps_data *ps;
4868 	struct ieee80211_tx_info *info;
4869 	struct ieee80211_chanctx_conf *chanctx_conf;
4870 
4871 	sdata = vif_to_sdata(vif);
4872 
4873 	rcu_read_lock();
4874 	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4875 
4876 	if (!chanctx_conf)
4877 		goto out;
4878 
4879 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
4880 		struct beacon_data *beacon =
4881 				rcu_dereference(sdata->u.ap.beacon);
4882 
4883 		if (!beacon || !beacon->head)
4884 			goto out;
4885 
4886 		ps = &sdata->u.ap.ps;
4887 	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4888 		ps = &sdata->u.mesh.ps;
4889 	} else {
4890 		goto out;
4891 	}
4892 
4893 	if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4894 		goto out; /* send buffered bc/mc only after DTIM beacon */
4895 
4896 	while (1) {
4897 		skb = skb_dequeue(&ps->bc_buf);
4898 		if (!skb)
4899 			goto out;
4900 		local->total_ps_buffered--;
4901 
4902 		if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4903 			struct ieee80211_hdr *hdr =
4904 				(struct ieee80211_hdr *) skb->data;
4905 			/* more buffered multicast/broadcast frames ==> set
4906 			 * MoreData flag in IEEE 802.11 header to inform PS
4907 			 * STAs */
4908 			hdr->frame_control |=
4909 				cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4910 		}
4911 
4912 		if (sdata->vif.type == NL80211_IFTYPE_AP)
4913 			sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4914 		if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4915 			break;
4916 		ieee80211_free_txskb(hw, skb);
4917 	}
4918 
4919 	info = IEEE80211_SKB_CB(skb);
4920 
4921 	tx.flags |= IEEE80211_TX_PS_BUFFERED;
4922 	info->band = chanctx_conf->def.chan->band;
4923 
4924 	if (invoke_tx_handlers(&tx))
4925 		skb = NULL;
4926  out:
4927 	rcu_read_unlock();
4928 
4929 	return skb;
4930 }
4931 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4932 
4933 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4934 {
4935 	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4936 	struct ieee80211_sub_if_data *sdata = sta->sdata;
4937 	struct ieee80211_local *local = sdata->local;
4938 	int ret;
4939 	u32 queues;
4940 
4941 	lockdep_assert_held(&local->sta_mtx);
4942 
4943 	/* only some cases are supported right now */
4944 	switch (sdata->vif.type) {
4945 	case NL80211_IFTYPE_STATION:
4946 	case NL80211_IFTYPE_AP:
4947 	case NL80211_IFTYPE_AP_VLAN:
4948 		break;
4949 	default:
4950 		WARN_ON(1);
4951 		return -EINVAL;
4952 	}
4953 
4954 	if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4955 		return -EINVAL;
4956 
4957 	if (sta->reserved_tid == tid) {
4958 		ret = 0;
4959 		goto out;
4960 	}
4961 
4962 	if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4963 		sdata_err(sdata, "TID reservation already active\n");
4964 		ret = -EALREADY;
4965 		goto out;
4966 	}
4967 
4968 	ieee80211_stop_vif_queues(sdata->local, sdata,
4969 				  IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4970 
4971 	synchronize_net();
4972 
4973 	/* Tear down BA sessions so we stop aggregating on this TID */
4974 	if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4975 		set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4976 		__ieee80211_stop_tx_ba_session(sta, tid,
4977 					       AGG_STOP_LOCAL_REQUEST);
4978 	}
4979 
4980 	queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4981 	__ieee80211_flush_queues(local, sdata, queues, false);
4982 
4983 	sta->reserved_tid = tid;
4984 
4985 	ieee80211_wake_vif_queues(local, sdata,
4986 				  IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4987 
4988 	if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4989 		clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4990 
4991 	ret = 0;
4992  out:
4993 	return ret;
4994 }
4995 EXPORT_SYMBOL(ieee80211_reserve_tid);
4996 
4997 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4998 {
4999 	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
5000 	struct ieee80211_sub_if_data *sdata = sta->sdata;
5001 
5002 	lockdep_assert_held(&sdata->local->sta_mtx);
5003 
5004 	/* only some cases are supported right now */
5005 	switch (sdata->vif.type) {
5006 	case NL80211_IFTYPE_STATION:
5007 	case NL80211_IFTYPE_AP:
5008 	case NL80211_IFTYPE_AP_VLAN:
5009 		break;
5010 	default:
5011 		WARN_ON(1);
5012 		return;
5013 	}
5014 
5015 	if (tid != sta->reserved_tid) {
5016 		sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
5017 		return;
5018 	}
5019 
5020 	sta->reserved_tid = IEEE80211_TID_UNRESERVED;
5021 }
5022 EXPORT_SYMBOL(ieee80211_unreserve_tid);
5023 
5024 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
5025 				 struct sk_buff *skb, int tid,
5026 				 enum nl80211_band band, u32 txdata_flags)
5027 {
5028 	int ac = ieee80211_ac_from_tid(tid);
5029 
5030 	skb_reset_mac_header(skb);
5031 	skb_set_queue_mapping(skb, ac);
5032 	skb->priority = tid;
5033 
5034 	skb->dev = sdata->dev;
5035 
5036 	/*
5037 	 * The other path calling ieee80211_xmit is from the tasklet,
5038 	 * and while we can handle concurrent transmissions locking
5039 	 * requirements are that we do not come into tx with bhs on.
5040 	 */
5041 	local_bh_disable();
5042 	IEEE80211_SKB_CB(skb)->band = band;
5043 	ieee80211_xmit(sdata, NULL, skb, txdata_flags);
5044 	local_bh_enable();
5045 }
5046 
5047 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
5048 			      const u8 *buf, size_t len,
5049 			      const u8 *dest, __be16 proto, bool unencrypted)
5050 {
5051 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
5052 	struct ieee80211_local *local = sdata->local;
5053 	struct sk_buff *skb;
5054 	struct ethhdr *ehdr;
5055 	u32 flags;
5056 
5057 	/* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE
5058 	 * or Pre-Authentication
5059 	 */
5060 	if (proto != sdata->control_port_protocol &&
5061 	    proto != cpu_to_be16(ETH_P_PREAUTH))
5062 		return -EINVAL;
5063 
5064 	if (unencrypted)
5065 		flags = IEEE80211_TX_INTFL_DONT_ENCRYPT;
5066 	else
5067 		flags = 0;
5068 
5069 	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
5070 			    sizeof(struct ethhdr) + len);
5071 	if (!skb)
5072 		return -ENOMEM;
5073 
5074 	skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr));
5075 
5076 	skb_put_data(skb, buf, len);
5077 
5078 	ehdr = skb_push(skb, sizeof(struct ethhdr));
5079 	memcpy(ehdr->h_dest, dest, ETH_ALEN);
5080 	memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
5081 	ehdr->h_proto = proto;
5082 
5083 	skb->dev = dev;
5084 	skb->protocol = htons(ETH_P_802_3);
5085 	skb_reset_network_header(skb);
5086 	skb_reset_mac_header(skb);
5087 
5088 	local_bh_disable();
5089 	__ieee80211_subif_start_xmit(skb, skb->dev, flags, 0);
5090 	local_bh_enable();
5091 
5092 	return 0;
5093 }
5094 
5095 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev,
5096 			      const u8 *buf, size_t len)
5097 {
5098 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
5099 	struct ieee80211_local *local = sdata->local;
5100 	struct sk_buff *skb;
5101 
5102 	skb = dev_alloc_skb(local->hw.extra_tx_headroom + len +
5103 			    30 + /* header size */
5104 			    18); /* 11s header size */
5105 	if (!skb)
5106 		return -ENOMEM;
5107 
5108 	skb_reserve(skb, local->hw.extra_tx_headroom);
5109 	skb_put_data(skb, buf, len);
5110 
5111 	skb->dev = dev;
5112 	skb->protocol = htons(ETH_P_802_3);
5113 	skb_reset_network_header(skb);
5114 	skb_reset_mac_header(skb);
5115 
5116 	local_bh_disable();
5117 	__ieee80211_subif_start_xmit(skb, skb->dev, 0,
5118 				     IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP);
5119 	local_bh_enable();
5120 
5121 	return 0;
5122 }
5123