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TOMOYO Linux Cross Reference
Linux/net/mac80211/tx.c

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  1 /*
  2  * Copyright 2002-2005, Instant802 Networks, Inc.
  3  * Copyright 2005-2006, Devicescape Software, Inc.
  4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
  5  * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
  6  * Copyright 2013-2014  Intel Mobile Communications GmbH
  7  * Copyright (C) 2018 Intel Corporation
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License version 2 as
 11  * published by the Free Software Foundation.
 12  *
 13  *
 14  * Transmit and frame generation functions.
 15  */
 16 
 17 #include <linux/kernel.h>
 18 #include <linux/slab.h>
 19 #include <linux/skbuff.h>
 20 #include <linux/if_vlan.h>
 21 #include <linux/etherdevice.h>
 22 #include <linux/bitmap.h>
 23 #include <linux/rcupdate.h>
 24 #include <linux/export.h>
 25 #include <net/net_namespace.h>
 26 #include <net/ieee80211_radiotap.h>
 27 #include <net/cfg80211.h>
 28 #include <net/mac80211.h>
 29 #include <net/codel.h>
 30 #include <net/codel_impl.h>
 31 #include <asm/unaligned.h>
 32 #include <net/fq_impl.h>
 33 
 34 #include "ieee80211_i.h"
 35 #include "driver-ops.h"
 36 #include "led.h"
 37 #include "mesh.h"
 38 #include "wep.h"
 39 #include "wpa.h"
 40 #include "wme.h"
 41 #include "rate.h"
 42 
 43 /* misc utils */
 44 
 45 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
 46 {
 47         struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
 48 
 49         u64_stats_update_begin(&tstats->syncp);
 50         tstats->tx_packets++;
 51         tstats->tx_bytes += len;
 52         u64_stats_update_end(&tstats->syncp);
 53 }
 54 
 55 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
 56                                  struct sk_buff *skb, int group_addr,
 57                                  int next_frag_len)
 58 {
 59         int rate, mrate, erp, dur, i, shift = 0;
 60         struct ieee80211_rate *txrate;
 61         struct ieee80211_local *local = tx->local;
 62         struct ieee80211_supported_band *sband;
 63         struct ieee80211_hdr *hdr;
 64         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 65         struct ieee80211_chanctx_conf *chanctx_conf;
 66         u32 rate_flags = 0;
 67 
 68         /* assume HW handles this */
 69         if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
 70                 return 0;
 71 
 72         rcu_read_lock();
 73         chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
 74         if (chanctx_conf) {
 75                 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
 76                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 77         }
 78         rcu_read_unlock();
 79 
 80         /* uh huh? */
 81         if (WARN_ON_ONCE(tx->rate.idx < 0))
 82                 return 0;
 83 
 84         sband = local->hw.wiphy->bands[info->band];
 85         txrate = &sband->bitrates[tx->rate.idx];
 86 
 87         erp = txrate->flags & IEEE80211_RATE_ERP_G;
 88 
 89         /*
 90          * data and mgmt (except PS Poll):
 91          * - during CFP: 32768
 92          * - during contention period:
 93          *   if addr1 is group address: 0
 94          *   if more fragments = 0 and addr1 is individual address: time to
 95          *      transmit one ACK plus SIFS
 96          *   if more fragments = 1 and addr1 is individual address: time to
 97          *      transmit next fragment plus 2 x ACK plus 3 x SIFS
 98          *
 99          * IEEE 802.11, 9.6:
100          * - control response frame (CTS or ACK) shall be transmitted using the
101          *   same rate as the immediately previous frame in the frame exchange
102          *   sequence, if this rate belongs to the PHY mandatory rates, or else
103          *   at the highest possible rate belonging to the PHY rates in the
104          *   BSSBasicRateSet
105          */
106         hdr = (struct ieee80211_hdr *)skb->data;
107         if (ieee80211_is_ctl(hdr->frame_control)) {
108                 /* TODO: These control frames are not currently sent by
109                  * mac80211, but should they be implemented, this function
110                  * needs to be updated to support duration field calculation.
111                  *
112                  * RTS: time needed to transmit pending data/mgmt frame plus
113                  *    one CTS frame plus one ACK frame plus 3 x SIFS
114                  * CTS: duration of immediately previous RTS minus time
115                  *    required to transmit CTS and its SIFS
116                  * ACK: 0 if immediately previous directed data/mgmt had
117                  *    more=0, with more=1 duration in ACK frame is duration
118                  *    from previous frame minus time needed to transmit ACK
119                  *    and its SIFS
120                  * PS Poll: BIT(15) | BIT(14) | aid
121                  */
122                 return 0;
123         }
124 
125         /* data/mgmt */
126         if (0 /* FIX: data/mgmt during CFP */)
127                 return cpu_to_le16(32768);
128 
129         if (group_addr) /* Group address as the destination - no ACK */
130                 return 0;
131 
132         /* Individual destination address:
133          * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
134          * CTS and ACK frames shall be transmitted using the highest rate in
135          * basic rate set that is less than or equal to the rate of the
136          * immediately previous frame and that is using the same modulation
137          * (CCK or OFDM). If no basic rate set matches with these requirements,
138          * the highest mandatory rate of the PHY that is less than or equal to
139          * the rate of the previous frame is used.
140          * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
141          */
142         rate = -1;
143         /* use lowest available if everything fails */
144         mrate = sband->bitrates[0].bitrate;
145         for (i = 0; i < sband->n_bitrates; i++) {
146                 struct ieee80211_rate *r = &sband->bitrates[i];
147 
148                 if (r->bitrate > txrate->bitrate)
149                         break;
150 
151                 if ((rate_flags & r->flags) != rate_flags)
152                         continue;
153 
154                 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
155                         rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
156 
157                 switch (sband->band) {
158                 case NL80211_BAND_2GHZ: {
159                         u32 flag;
160                         if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
161                                 flag = IEEE80211_RATE_MANDATORY_G;
162                         else
163                                 flag = IEEE80211_RATE_MANDATORY_B;
164                         if (r->flags & flag)
165                                 mrate = r->bitrate;
166                         break;
167                 }
168                 case NL80211_BAND_5GHZ:
169                         if (r->flags & IEEE80211_RATE_MANDATORY_A)
170                                 mrate = r->bitrate;
171                         break;
172                 case NL80211_BAND_60GHZ:
173                         /* TODO, for now fall through */
174                 case NUM_NL80211_BANDS:
175                         WARN_ON(1);
176                         break;
177                 }
178         }
179         if (rate == -1) {
180                 /* No matching basic rate found; use highest suitable mandatory
181                  * PHY rate */
182                 rate = DIV_ROUND_UP(mrate, 1 << shift);
183         }
184 
185         /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
186         if (ieee80211_is_data_qos(hdr->frame_control) &&
187             *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
188                 dur = 0;
189         else
190                 /* Time needed to transmit ACK
191                  * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
192                  * to closest integer */
193                 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
194                                 tx->sdata->vif.bss_conf.use_short_preamble,
195                                 shift);
196 
197         if (next_frag_len) {
198                 /* Frame is fragmented: duration increases with time needed to
199                  * transmit next fragment plus ACK and 2 x SIFS. */
200                 dur *= 2; /* ACK + SIFS */
201                 /* next fragment */
202                 dur += ieee80211_frame_duration(sband->band, next_frag_len,
203                                 txrate->bitrate, erp,
204                                 tx->sdata->vif.bss_conf.use_short_preamble,
205                                 shift);
206         }
207 
208         return cpu_to_le16(dur);
209 }
210 
211 /* tx handlers */
212 static ieee80211_tx_result debug_noinline
213 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
214 {
215         struct ieee80211_local *local = tx->local;
216         struct ieee80211_if_managed *ifmgd;
217 
218         /* driver doesn't support power save */
219         if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
220                 return TX_CONTINUE;
221 
222         /* hardware does dynamic power save */
223         if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
224                 return TX_CONTINUE;
225 
226         /* dynamic power save disabled */
227         if (local->hw.conf.dynamic_ps_timeout <= 0)
228                 return TX_CONTINUE;
229 
230         /* we are scanning, don't enable power save */
231         if (local->scanning)
232                 return TX_CONTINUE;
233 
234         if (!local->ps_sdata)
235                 return TX_CONTINUE;
236 
237         /* No point if we're going to suspend */
238         if (local->quiescing)
239                 return TX_CONTINUE;
240 
241         /* dynamic ps is supported only in managed mode */
242         if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
243                 return TX_CONTINUE;
244 
245         ifmgd = &tx->sdata->u.mgd;
246 
247         /*
248          * Don't wakeup from power save if u-apsd is enabled, voip ac has
249          * u-apsd enabled and the frame is in voip class. This effectively
250          * means that even if all access categories have u-apsd enabled, in
251          * practise u-apsd is only used with the voip ac. This is a
252          * workaround for the case when received voip class packets do not
253          * have correct qos tag for some reason, due the network or the
254          * peer application.
255          *
256          * Note: ifmgd->uapsd_queues access is racy here. If the value is
257          * changed via debugfs, user needs to reassociate manually to have
258          * everything in sync.
259          */
260         if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
261             (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
262             skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
263                 return TX_CONTINUE;
264 
265         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
266                 ieee80211_stop_queues_by_reason(&local->hw,
267                                                 IEEE80211_MAX_QUEUE_MAP,
268                                                 IEEE80211_QUEUE_STOP_REASON_PS,
269                                                 false);
270                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
271                 ieee80211_queue_work(&local->hw,
272                                      &local->dynamic_ps_disable_work);
273         }
274 
275         /* Don't restart the timer if we're not disassociated */
276         if (!ifmgd->associated)
277                 return TX_CONTINUE;
278 
279         mod_timer(&local->dynamic_ps_timer, jiffies +
280                   msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
281 
282         return TX_CONTINUE;
283 }
284 
285 static ieee80211_tx_result debug_noinline
286 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
287 {
288 
289         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
290         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
291         bool assoc = false;
292 
293         if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
294                 return TX_CONTINUE;
295 
296         if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
297             test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
298             !ieee80211_is_probe_req(hdr->frame_control) &&
299             !ieee80211_is_nullfunc(hdr->frame_control))
300                 /*
301                  * When software scanning only nullfunc frames (to notify
302                  * the sleep state to the AP) and probe requests (for the
303                  * active scan) are allowed, all other frames should not be
304                  * sent and we should not get here, but if we do
305                  * nonetheless, drop them to avoid sending them
306                  * off-channel. See the link below and
307                  * ieee80211_start_scan() for more.
308                  *
309                  * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
310                  */
311                 return TX_DROP;
312 
313         if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
314                 return TX_CONTINUE;
315 
316         if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
317                 return TX_CONTINUE;
318 
319         if (tx->flags & IEEE80211_TX_PS_BUFFERED)
320                 return TX_CONTINUE;
321 
322         if (tx->sta)
323                 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
324 
325         if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
326                 if (unlikely(!assoc &&
327                              ieee80211_is_data(hdr->frame_control))) {
328 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
329                         sdata_info(tx->sdata,
330                                    "dropped data frame to not associated station %pM\n",
331                                    hdr->addr1);
332 #endif
333                         I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
334                         return TX_DROP;
335                 }
336         } else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
337                             ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
338                 /*
339                  * No associated STAs - no need to send multicast
340                  * frames.
341                  */
342                 return TX_DROP;
343         }
344 
345         return TX_CONTINUE;
346 }
347 
348 /* This function is called whenever the AP is about to exceed the maximum limit
349  * of buffered frames for power saving STAs. This situation should not really
350  * happen often during normal operation, so dropping the oldest buffered packet
351  * from each queue should be OK to make some room for new frames. */
352 static void purge_old_ps_buffers(struct ieee80211_local *local)
353 {
354         int total = 0, purged = 0;
355         struct sk_buff *skb;
356         struct ieee80211_sub_if_data *sdata;
357         struct sta_info *sta;
358 
359         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
360                 struct ps_data *ps;
361 
362                 if (sdata->vif.type == NL80211_IFTYPE_AP)
363                         ps = &sdata->u.ap.ps;
364                 else if (ieee80211_vif_is_mesh(&sdata->vif))
365                         ps = &sdata->u.mesh.ps;
366                 else
367                         continue;
368 
369                 skb = skb_dequeue(&ps->bc_buf);
370                 if (skb) {
371                         purged++;
372                         ieee80211_free_txskb(&local->hw, skb);
373                 }
374                 total += skb_queue_len(&ps->bc_buf);
375         }
376 
377         /*
378          * Drop one frame from each station from the lowest-priority
379          * AC that has frames at all.
380          */
381         list_for_each_entry_rcu(sta, &local->sta_list, list) {
382                 int ac;
383 
384                 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
385                         skb = skb_dequeue(&sta->ps_tx_buf[ac]);
386                         total += skb_queue_len(&sta->ps_tx_buf[ac]);
387                         if (skb) {
388                                 purged++;
389                                 ieee80211_free_txskb(&local->hw, skb);
390                                 break;
391                         }
392                 }
393         }
394 
395         local->total_ps_buffered = total;
396         ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
397 }
398 
399 static ieee80211_tx_result
400 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
401 {
402         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
403         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
404         struct ps_data *ps;
405 
406         /*
407          * broadcast/multicast frame
408          *
409          * If any of the associated/peer stations is in power save mode,
410          * the frame is buffered to be sent after DTIM beacon frame.
411          * This is done either by the hardware or us.
412          */
413 
414         /* powersaving STAs currently only in AP/VLAN/mesh mode */
415         if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
416             tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
417                 if (!tx->sdata->bss)
418                         return TX_CONTINUE;
419 
420                 ps = &tx->sdata->bss->ps;
421         } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
422                 ps = &tx->sdata->u.mesh.ps;
423         } else {
424                 return TX_CONTINUE;
425         }
426 
427 
428         /* no buffering for ordered frames */
429         if (ieee80211_has_order(hdr->frame_control))
430                 return TX_CONTINUE;
431 
432         if (ieee80211_is_probe_req(hdr->frame_control))
433                 return TX_CONTINUE;
434 
435         if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
436                 info->hw_queue = tx->sdata->vif.cab_queue;
437 
438         /* no stations in PS mode */
439         if (!atomic_read(&ps->num_sta_ps))
440                 return TX_CONTINUE;
441 
442         info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
443 
444         /* device releases frame after DTIM beacon */
445         if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
446                 return TX_CONTINUE;
447 
448         /* buffered in mac80211 */
449         if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
450                 purge_old_ps_buffers(tx->local);
451 
452         if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
453                 ps_dbg(tx->sdata,
454                        "BC TX buffer full - dropping the oldest frame\n");
455                 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
456         } else
457                 tx->local->total_ps_buffered++;
458 
459         skb_queue_tail(&ps->bc_buf, tx->skb);
460 
461         return TX_QUEUED;
462 }
463 
464 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
465                              struct sk_buff *skb)
466 {
467         if (!ieee80211_is_mgmt(fc))
468                 return 0;
469 
470         if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
471                 return 0;
472 
473         if (!ieee80211_is_robust_mgmt_frame(skb))
474                 return 0;
475 
476         return 1;
477 }
478 
479 static ieee80211_tx_result
480 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
481 {
482         struct sta_info *sta = tx->sta;
483         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
484         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
485         struct ieee80211_local *local = tx->local;
486 
487         if (unlikely(!sta))
488                 return TX_CONTINUE;
489 
490         if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
491                       test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
492                       test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
493                      !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
494                 int ac = skb_get_queue_mapping(tx->skb);
495 
496                 if (ieee80211_is_mgmt(hdr->frame_control) &&
497                     !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
498                         info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
499                         return TX_CONTINUE;
500                 }
501 
502                 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
503                        sta->sta.addr, sta->sta.aid, ac);
504                 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
505                         purge_old_ps_buffers(tx->local);
506 
507                 /* sync with ieee80211_sta_ps_deliver_wakeup */
508                 spin_lock(&sta->ps_lock);
509                 /*
510                  * STA woke up the meantime and all the frames on ps_tx_buf have
511                  * been queued to pending queue. No reordering can happen, go
512                  * ahead and Tx the packet.
513                  */
514                 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
515                     !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
516                     !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
517                         spin_unlock(&sta->ps_lock);
518                         return TX_CONTINUE;
519                 }
520 
521                 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
522                         struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
523                         ps_dbg(tx->sdata,
524                                "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
525                                sta->sta.addr, ac);
526                         ieee80211_free_txskb(&local->hw, old);
527                 } else
528                         tx->local->total_ps_buffered++;
529 
530                 info->control.jiffies = jiffies;
531                 info->control.vif = &tx->sdata->vif;
532                 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
533                 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
534                 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
535                 spin_unlock(&sta->ps_lock);
536 
537                 if (!timer_pending(&local->sta_cleanup))
538                         mod_timer(&local->sta_cleanup,
539                                   round_jiffies(jiffies +
540                                                 STA_INFO_CLEANUP_INTERVAL));
541 
542                 /*
543                  * We queued up some frames, so the TIM bit might
544                  * need to be set, recalculate it.
545                  */
546                 sta_info_recalc_tim(sta);
547 
548                 return TX_QUEUED;
549         } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
550                 ps_dbg(tx->sdata,
551                        "STA %pM in PS mode, but polling/in SP -> send frame\n",
552                        sta->sta.addr);
553         }
554 
555         return TX_CONTINUE;
556 }
557 
558 static ieee80211_tx_result debug_noinline
559 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
560 {
561         if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
562                 return TX_CONTINUE;
563 
564         if (tx->flags & IEEE80211_TX_UNICAST)
565                 return ieee80211_tx_h_unicast_ps_buf(tx);
566         else
567                 return ieee80211_tx_h_multicast_ps_buf(tx);
568 }
569 
570 static ieee80211_tx_result debug_noinline
571 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
572 {
573         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
574 
575         if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
576                 if (tx->sdata->control_port_no_encrypt)
577                         info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
578                 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
579                 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
580         }
581 
582         return TX_CONTINUE;
583 }
584 
585 static ieee80211_tx_result debug_noinline
586 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
587 {
588         struct ieee80211_key *key;
589         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
590         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
591 
592         if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
593                 tx->key = NULL;
594         else if (tx->sta &&
595                  (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
596                 tx->key = key;
597         else if (ieee80211_is_group_privacy_action(tx->skb) &&
598                 (key = rcu_dereference(tx->sdata->default_multicast_key)))
599                 tx->key = key;
600         else if (ieee80211_is_mgmt(hdr->frame_control) &&
601                  is_multicast_ether_addr(hdr->addr1) &&
602                  ieee80211_is_robust_mgmt_frame(tx->skb) &&
603                  (key = rcu_dereference(tx->sdata->default_mgmt_key)))
604                 tx->key = key;
605         else if (is_multicast_ether_addr(hdr->addr1) &&
606                  (key = rcu_dereference(tx->sdata->default_multicast_key)))
607                 tx->key = key;
608         else if (!is_multicast_ether_addr(hdr->addr1) &&
609                  (key = rcu_dereference(tx->sdata->default_unicast_key)))
610                 tx->key = key;
611         else
612                 tx->key = NULL;
613 
614         if (tx->key) {
615                 bool skip_hw = false;
616 
617                 /* TODO: add threshold stuff again */
618 
619                 switch (tx->key->conf.cipher) {
620                 case WLAN_CIPHER_SUITE_WEP40:
621                 case WLAN_CIPHER_SUITE_WEP104:
622                 case WLAN_CIPHER_SUITE_TKIP:
623                         if (!ieee80211_is_data_present(hdr->frame_control))
624                                 tx->key = NULL;
625                         break;
626                 case WLAN_CIPHER_SUITE_CCMP:
627                 case WLAN_CIPHER_SUITE_CCMP_256:
628                 case WLAN_CIPHER_SUITE_GCMP:
629                 case WLAN_CIPHER_SUITE_GCMP_256:
630                         if (!ieee80211_is_data_present(hdr->frame_control) &&
631                             !ieee80211_use_mfp(hdr->frame_control, tx->sta,
632                                                tx->skb) &&
633                             !ieee80211_is_group_privacy_action(tx->skb))
634                                 tx->key = NULL;
635                         else
636                                 skip_hw = (tx->key->conf.flags &
637                                            IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
638                                         ieee80211_is_mgmt(hdr->frame_control);
639                         break;
640                 case WLAN_CIPHER_SUITE_AES_CMAC:
641                 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
642                 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
643                 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
644                         if (!ieee80211_is_mgmt(hdr->frame_control))
645                                 tx->key = NULL;
646                         break;
647                 }
648 
649                 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
650                              !ieee80211_is_deauth(hdr->frame_control)))
651                         return TX_DROP;
652 
653                 if (!skip_hw && tx->key &&
654                     tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
655                         info->control.hw_key = &tx->key->conf;
656         }
657 
658         return TX_CONTINUE;
659 }
660 
661 static ieee80211_tx_result debug_noinline
662 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
663 {
664         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
665         struct ieee80211_hdr *hdr = (void *)tx->skb->data;
666         struct ieee80211_supported_band *sband;
667         u32 len;
668         struct ieee80211_tx_rate_control txrc;
669         struct ieee80211_sta_rates *ratetbl = NULL;
670         bool assoc = false;
671 
672         memset(&txrc, 0, sizeof(txrc));
673 
674         sband = tx->local->hw.wiphy->bands[info->band];
675 
676         len = min_t(u32, tx->skb->len + FCS_LEN,
677                          tx->local->hw.wiphy->frag_threshold);
678 
679         /* set up the tx rate control struct we give the RC algo */
680         txrc.hw = &tx->local->hw;
681         txrc.sband = sband;
682         txrc.bss_conf = &tx->sdata->vif.bss_conf;
683         txrc.skb = tx->skb;
684         txrc.reported_rate.idx = -1;
685         txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
686 
687         if (tx->sdata->rc_has_mcs_mask[info->band])
688                 txrc.rate_idx_mcs_mask =
689                         tx->sdata->rc_rateidx_mcs_mask[info->band];
690 
691         txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
692                     tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
693                     tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
694                     tx->sdata->vif.type == NL80211_IFTYPE_OCB);
695 
696         /* set up RTS protection if desired */
697         if (len > tx->local->hw.wiphy->rts_threshold) {
698                 txrc.rts = true;
699         }
700 
701         info->control.use_rts = txrc.rts;
702         info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
703 
704         /*
705          * Use short preamble if the BSS can handle it, but not for
706          * management frames unless we know the receiver can handle
707          * that -- the management frame might be to a station that
708          * just wants a probe response.
709          */
710         if (tx->sdata->vif.bss_conf.use_short_preamble &&
711             (ieee80211_is_data(hdr->frame_control) ||
712              (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
713                 txrc.short_preamble = true;
714 
715         info->control.short_preamble = txrc.short_preamble;
716 
717         /* don't ask rate control when rate already injected via radiotap */
718         if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
719                 return TX_CONTINUE;
720 
721         if (tx->sta)
722                 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
723 
724         /*
725          * Lets not bother rate control if we're associated and cannot
726          * talk to the sta. This should not happen.
727          */
728         if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
729                  !rate_usable_index_exists(sband, &tx->sta->sta),
730                  "%s: Dropped data frame as no usable bitrate found while "
731                  "scanning and associated. Target station: "
732                  "%pM on %d GHz band\n",
733                  tx->sdata->name, hdr->addr1,
734                  info->band ? 5 : 2))
735                 return TX_DROP;
736 
737         /*
738          * If we're associated with the sta at this point we know we can at
739          * least send the frame at the lowest bit rate.
740          */
741         rate_control_get_rate(tx->sdata, tx->sta, &txrc);
742 
743         if (tx->sta && !info->control.skip_table)
744                 ratetbl = rcu_dereference(tx->sta->sta.rates);
745 
746         if (unlikely(info->control.rates[0].idx < 0)) {
747                 if (ratetbl) {
748                         struct ieee80211_tx_rate rate = {
749                                 .idx = ratetbl->rate[0].idx,
750                                 .flags = ratetbl->rate[0].flags,
751                                 .count = ratetbl->rate[0].count
752                         };
753 
754                         if (ratetbl->rate[0].idx < 0)
755                                 return TX_DROP;
756 
757                         tx->rate = rate;
758                 } else {
759                         return TX_DROP;
760                 }
761         } else {
762                 tx->rate = info->control.rates[0];
763         }
764 
765         if (txrc.reported_rate.idx < 0) {
766                 txrc.reported_rate = tx->rate;
767                 if (tx->sta && ieee80211_is_data(hdr->frame_control))
768                         tx->sta->tx_stats.last_rate = txrc.reported_rate;
769         } else if (tx->sta)
770                 tx->sta->tx_stats.last_rate = txrc.reported_rate;
771 
772         if (ratetbl)
773                 return TX_CONTINUE;
774 
775         if (unlikely(!info->control.rates[0].count))
776                 info->control.rates[0].count = 1;
777 
778         if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
779                          (info->flags & IEEE80211_TX_CTL_NO_ACK)))
780                 info->control.rates[0].count = 1;
781 
782         return TX_CONTINUE;
783 }
784 
785 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
786 {
787         u16 *seq = &sta->tid_seq[tid];
788         __le16 ret = cpu_to_le16(*seq);
789 
790         /* Increase the sequence number. */
791         *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
792 
793         return ret;
794 }
795 
796 static ieee80211_tx_result debug_noinline
797 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
798 {
799         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
800         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
801         int tid;
802 
803         /*
804          * Packet injection may want to control the sequence
805          * number, if we have no matching interface then we
806          * neither assign one ourselves nor ask the driver to.
807          */
808         if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
809                 return TX_CONTINUE;
810 
811         if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
812                 return TX_CONTINUE;
813 
814         if (ieee80211_hdrlen(hdr->frame_control) < 24)
815                 return TX_CONTINUE;
816 
817         if (ieee80211_is_qos_nullfunc(hdr->frame_control))
818                 return TX_CONTINUE;
819 
820         /*
821          * Anything but QoS data that has a sequence number field
822          * (is long enough) gets a sequence number from the global
823          * counter.  QoS data frames with a multicast destination
824          * also use the global counter (802.11-2012 9.3.2.10).
825          */
826         if (!ieee80211_is_data_qos(hdr->frame_control) ||
827             is_multicast_ether_addr(hdr->addr1)) {
828                 /* driver should assign sequence number */
829                 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
830                 /* for pure STA mode without beacons, we can do it */
831                 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
832                 tx->sdata->sequence_number += 0x10;
833                 if (tx->sta)
834                         tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
835                 return TX_CONTINUE;
836         }
837 
838         /*
839          * This should be true for injected/management frames only, for
840          * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
841          * above since they are not QoS-data frames.
842          */
843         if (!tx->sta)
844                 return TX_CONTINUE;
845 
846         /* include per-STA, per-TID sequence counter */
847         tid = ieee80211_get_tid(hdr);
848         tx->sta->tx_stats.msdu[tid]++;
849 
850         hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
851 
852         return TX_CONTINUE;
853 }
854 
855 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
856                               struct sk_buff *skb, int hdrlen,
857                               int frag_threshold)
858 {
859         struct ieee80211_local *local = tx->local;
860         struct ieee80211_tx_info *info;
861         struct sk_buff *tmp;
862         int per_fragm = frag_threshold - hdrlen - FCS_LEN;
863         int pos = hdrlen + per_fragm;
864         int rem = skb->len - hdrlen - per_fragm;
865 
866         if (WARN_ON(rem < 0))
867                 return -EINVAL;
868 
869         /* first fragment was already added to queue by caller */
870 
871         while (rem) {
872                 int fraglen = per_fragm;
873 
874                 if (fraglen > rem)
875                         fraglen = rem;
876                 rem -= fraglen;
877                 tmp = dev_alloc_skb(local->tx_headroom +
878                                     frag_threshold +
879                                     tx->sdata->encrypt_headroom +
880                                     IEEE80211_ENCRYPT_TAILROOM);
881                 if (!tmp)
882                         return -ENOMEM;
883 
884                 __skb_queue_tail(&tx->skbs, tmp);
885 
886                 skb_reserve(tmp,
887                             local->tx_headroom + tx->sdata->encrypt_headroom);
888 
889                 /* copy control information */
890                 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
891 
892                 info = IEEE80211_SKB_CB(tmp);
893                 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
894                                  IEEE80211_TX_CTL_FIRST_FRAGMENT);
895 
896                 if (rem)
897                         info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
898 
899                 skb_copy_queue_mapping(tmp, skb);
900                 tmp->priority = skb->priority;
901                 tmp->dev = skb->dev;
902 
903                 /* copy header and data */
904                 skb_put_data(tmp, skb->data, hdrlen);
905                 skb_put_data(tmp, skb->data + pos, fraglen);
906 
907                 pos += fraglen;
908         }
909 
910         /* adjust first fragment's length */
911         skb_trim(skb, hdrlen + per_fragm);
912         return 0;
913 }
914 
915 static ieee80211_tx_result debug_noinline
916 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
917 {
918         struct sk_buff *skb = tx->skb;
919         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
920         struct ieee80211_hdr *hdr = (void *)skb->data;
921         int frag_threshold = tx->local->hw.wiphy->frag_threshold;
922         int hdrlen;
923         int fragnum;
924 
925         /* no matter what happens, tx->skb moves to tx->skbs */
926         __skb_queue_tail(&tx->skbs, skb);
927         tx->skb = NULL;
928 
929         if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
930                 return TX_CONTINUE;
931 
932         if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
933                 return TX_CONTINUE;
934 
935         /*
936          * Warn when submitting a fragmented A-MPDU frame and drop it.
937          * This scenario is handled in ieee80211_tx_prepare but extra
938          * caution taken here as fragmented ampdu may cause Tx stop.
939          */
940         if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
941                 return TX_DROP;
942 
943         hdrlen = ieee80211_hdrlen(hdr->frame_control);
944 
945         /* internal error, why isn't DONTFRAG set? */
946         if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
947                 return TX_DROP;
948 
949         /*
950          * Now fragment the frame. This will allocate all the fragments and
951          * chain them (using skb as the first fragment) to skb->next.
952          * During transmission, we will remove the successfully transmitted
953          * fragments from this list. When the low-level driver rejects one
954          * of the fragments then we will simply pretend to accept the skb
955          * but store it away as pending.
956          */
957         if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
958                 return TX_DROP;
959 
960         /* update duration/seq/flags of fragments */
961         fragnum = 0;
962 
963         skb_queue_walk(&tx->skbs, skb) {
964                 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
965 
966                 hdr = (void *)skb->data;
967                 info = IEEE80211_SKB_CB(skb);
968 
969                 if (!skb_queue_is_last(&tx->skbs, skb)) {
970                         hdr->frame_control |= morefrags;
971                         /*
972                          * No multi-rate retries for fragmented frames, that
973                          * would completely throw off the NAV at other STAs.
974                          */
975                         info->control.rates[1].idx = -1;
976                         info->control.rates[2].idx = -1;
977                         info->control.rates[3].idx = -1;
978                         BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
979                         info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
980                 } else {
981                         hdr->frame_control &= ~morefrags;
982                 }
983                 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
984                 fragnum++;
985         }
986 
987         return TX_CONTINUE;
988 }
989 
990 static ieee80211_tx_result debug_noinline
991 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
992 {
993         struct sk_buff *skb;
994         int ac = -1;
995 
996         if (!tx->sta)
997                 return TX_CONTINUE;
998 
999         skb_queue_walk(&tx->skbs, skb) {
1000                 ac = skb_get_queue_mapping(skb);
1001                 tx->sta->tx_stats.bytes[ac] += skb->len;
1002         }
1003         if (ac >= 0)
1004                 tx->sta->tx_stats.packets[ac]++;
1005 
1006         return TX_CONTINUE;
1007 }
1008 
1009 static ieee80211_tx_result debug_noinline
1010 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1011 {
1012         if (!tx->key)
1013                 return TX_CONTINUE;
1014 
1015         switch (tx->key->conf.cipher) {
1016         case WLAN_CIPHER_SUITE_WEP40:
1017         case WLAN_CIPHER_SUITE_WEP104:
1018                 return ieee80211_crypto_wep_encrypt(tx);
1019         case WLAN_CIPHER_SUITE_TKIP:
1020                 return ieee80211_crypto_tkip_encrypt(tx);
1021         case WLAN_CIPHER_SUITE_CCMP:
1022                 return ieee80211_crypto_ccmp_encrypt(
1023                         tx, IEEE80211_CCMP_MIC_LEN);
1024         case WLAN_CIPHER_SUITE_CCMP_256:
1025                 return ieee80211_crypto_ccmp_encrypt(
1026                         tx, IEEE80211_CCMP_256_MIC_LEN);
1027         case WLAN_CIPHER_SUITE_AES_CMAC:
1028                 return ieee80211_crypto_aes_cmac_encrypt(tx);
1029         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1030                 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1031         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1032         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1033                 return ieee80211_crypto_aes_gmac_encrypt(tx);
1034         case WLAN_CIPHER_SUITE_GCMP:
1035         case WLAN_CIPHER_SUITE_GCMP_256:
1036                 return ieee80211_crypto_gcmp_encrypt(tx);
1037         default:
1038                 return ieee80211_crypto_hw_encrypt(tx);
1039         }
1040 
1041         return TX_DROP;
1042 }
1043 
1044 static ieee80211_tx_result debug_noinline
1045 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1046 {
1047         struct sk_buff *skb;
1048         struct ieee80211_hdr *hdr;
1049         int next_len;
1050         bool group_addr;
1051 
1052         skb_queue_walk(&tx->skbs, skb) {
1053                 hdr = (void *) skb->data;
1054                 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1055                         break; /* must not overwrite AID */
1056                 if (!skb_queue_is_last(&tx->skbs, skb)) {
1057                         struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1058                         next_len = next->len;
1059                 } else
1060                         next_len = 0;
1061                 group_addr = is_multicast_ether_addr(hdr->addr1);
1062 
1063                 hdr->duration_id =
1064                         ieee80211_duration(tx, skb, group_addr, next_len);
1065         }
1066 
1067         return TX_CONTINUE;
1068 }
1069 
1070 /* actual transmit path */
1071 
1072 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1073                                   struct sk_buff *skb,
1074                                   struct ieee80211_tx_info *info,
1075                                   struct tid_ampdu_tx *tid_tx,
1076                                   int tid)
1077 {
1078         bool queued = false;
1079         bool reset_agg_timer = false;
1080         struct sk_buff *purge_skb = NULL;
1081 
1082         if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1083                 info->flags |= IEEE80211_TX_CTL_AMPDU;
1084                 reset_agg_timer = true;
1085         } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1086                 /*
1087                  * nothing -- this aggregation session is being started
1088                  * but that might still fail with the driver
1089                  */
1090         } else if (!tx->sta->sta.txq[tid]) {
1091                 spin_lock(&tx->sta->lock);
1092                 /*
1093                  * Need to re-check now, because we may get here
1094                  *
1095                  *  1) in the window during which the setup is actually
1096                  *     already done, but not marked yet because not all
1097                  *     packets are spliced over to the driver pending
1098                  *     queue yet -- if this happened we acquire the lock
1099                  *     either before or after the splice happens, but
1100                  *     need to recheck which of these cases happened.
1101                  *
1102                  *  2) during session teardown, if the OPERATIONAL bit
1103                  *     was cleared due to the teardown but the pointer
1104                  *     hasn't been assigned NULL yet (or we loaded it
1105                  *     before it was assigned) -- in this case it may
1106                  *     now be NULL which means we should just let the
1107                  *     packet pass through because splicing the frames
1108                  *     back is already done.
1109                  */
1110                 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1111 
1112                 if (!tid_tx) {
1113                         /* do nothing, let packet pass through */
1114                 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1115                         info->flags |= IEEE80211_TX_CTL_AMPDU;
1116                         reset_agg_timer = true;
1117                 } else {
1118                         queued = true;
1119                         if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1120                                 clear_sta_flag(tx->sta, WLAN_STA_SP);
1121                                 ps_dbg(tx->sta->sdata,
1122                                        "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1123                                        tx->sta->sta.addr, tx->sta->sta.aid);
1124                         }
1125                         info->control.vif = &tx->sdata->vif;
1126                         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1127                         info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1128                         __skb_queue_tail(&tid_tx->pending, skb);
1129                         if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1130                                 purge_skb = __skb_dequeue(&tid_tx->pending);
1131                 }
1132                 spin_unlock(&tx->sta->lock);
1133 
1134                 if (purge_skb)
1135                         ieee80211_free_txskb(&tx->local->hw, purge_skb);
1136         }
1137 
1138         /* reset session timer */
1139         if (reset_agg_timer)
1140                 tid_tx->last_tx = jiffies;
1141 
1142         return queued;
1143 }
1144 
1145 /*
1146  * initialises @tx
1147  * pass %NULL for the station if unknown, a valid pointer if known
1148  * or an ERR_PTR() if the station is known not to exist
1149  */
1150 static ieee80211_tx_result
1151 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1152                      struct ieee80211_tx_data *tx,
1153                      struct sta_info *sta, struct sk_buff *skb)
1154 {
1155         struct ieee80211_local *local = sdata->local;
1156         struct ieee80211_hdr *hdr;
1157         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1158         int tid;
1159 
1160         memset(tx, 0, sizeof(*tx));
1161         tx->skb = skb;
1162         tx->local = local;
1163         tx->sdata = sdata;
1164         __skb_queue_head_init(&tx->skbs);
1165 
1166         /*
1167          * If this flag is set to true anywhere, and we get here,
1168          * we are doing the needed processing, so remove the flag
1169          * now.
1170          */
1171         info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1172 
1173         hdr = (struct ieee80211_hdr *) skb->data;
1174 
1175         if (likely(sta)) {
1176                 if (!IS_ERR(sta))
1177                         tx->sta = sta;
1178         } else {
1179                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1180                         tx->sta = rcu_dereference(sdata->u.vlan.sta);
1181                         if (!tx->sta && sdata->wdev.use_4addr)
1182                                 return TX_DROP;
1183                 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1184                                           IEEE80211_TX_CTL_INJECTED) ||
1185                            tx->sdata->control_port_protocol == tx->skb->protocol) {
1186                         tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1187                 }
1188                 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1189                         tx->sta = sta_info_get(sdata, hdr->addr1);
1190         }
1191 
1192         if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1193             !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1194             ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1195             !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1196                 struct tid_ampdu_tx *tid_tx;
1197 
1198                 tid = ieee80211_get_tid(hdr);
1199 
1200                 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1201                 if (tid_tx) {
1202                         bool queued;
1203 
1204                         queued = ieee80211_tx_prep_agg(tx, skb, info,
1205                                                        tid_tx, tid);
1206 
1207                         if (unlikely(queued))
1208                                 return TX_QUEUED;
1209                 }
1210         }
1211 
1212         if (is_multicast_ether_addr(hdr->addr1)) {
1213                 tx->flags &= ~IEEE80211_TX_UNICAST;
1214                 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1215         } else
1216                 tx->flags |= IEEE80211_TX_UNICAST;
1217 
1218         if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1219                 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1220                     skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1221                     info->flags & IEEE80211_TX_CTL_AMPDU)
1222                         info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1223         }
1224 
1225         if (!tx->sta)
1226                 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1227         else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1228                 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1229                 ieee80211_check_fast_xmit(tx->sta);
1230         }
1231 
1232         info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1233 
1234         return TX_CONTINUE;
1235 }
1236 
1237 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1238                                           struct ieee80211_vif *vif,
1239                                           struct sta_info *sta,
1240                                           struct sk_buff *skb)
1241 {
1242         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1243         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1244         struct ieee80211_txq *txq = NULL;
1245 
1246         if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1247             (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1248                 return NULL;
1249 
1250         if (!ieee80211_is_data(hdr->frame_control))
1251                 return NULL;
1252 
1253         if (sta) {
1254                 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1255 
1256                 if (!sta->uploaded)
1257                         return NULL;
1258 
1259                 txq = sta->sta.txq[tid];
1260         } else if (vif) {
1261                 txq = vif->txq;
1262         }
1263 
1264         if (!txq)
1265                 return NULL;
1266 
1267         return to_txq_info(txq);
1268 }
1269 
1270 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1271 {
1272         IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1273 }
1274 
1275 static u32 codel_skb_len_func(const struct sk_buff *skb)
1276 {
1277         return skb->len;
1278 }
1279 
1280 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1281 {
1282         const struct ieee80211_tx_info *info;
1283 
1284         info = (const struct ieee80211_tx_info *)skb->cb;
1285         return info->control.enqueue_time;
1286 }
1287 
1288 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1289                                           void *ctx)
1290 {
1291         struct ieee80211_local *local;
1292         struct txq_info *txqi;
1293         struct fq *fq;
1294         struct fq_flow *flow;
1295 
1296         txqi = ctx;
1297         local = vif_to_sdata(txqi->txq.vif)->local;
1298         fq = &local->fq;
1299 
1300         if (cvars == &txqi->def_cvars)
1301                 flow = &txqi->def_flow;
1302         else
1303                 flow = &fq->flows[cvars - local->cvars];
1304 
1305         return fq_flow_dequeue(fq, flow);
1306 }
1307 
1308 static void codel_drop_func(struct sk_buff *skb,
1309                             void *ctx)
1310 {
1311         struct ieee80211_local *local;
1312         struct ieee80211_hw *hw;
1313         struct txq_info *txqi;
1314 
1315         txqi = ctx;
1316         local = vif_to_sdata(txqi->txq.vif)->local;
1317         hw = &local->hw;
1318 
1319         ieee80211_free_txskb(hw, skb);
1320 }
1321 
1322 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1323                                            struct fq_tin *tin,
1324                                            struct fq_flow *flow)
1325 {
1326         struct ieee80211_local *local;
1327         struct txq_info *txqi;
1328         struct codel_vars *cvars;
1329         struct codel_params *cparams;
1330         struct codel_stats *cstats;
1331 
1332         local = container_of(fq, struct ieee80211_local, fq);
1333         txqi = container_of(tin, struct txq_info, tin);
1334         cstats = &txqi->cstats;
1335 
1336         if (txqi->txq.sta) {
1337                 struct sta_info *sta = container_of(txqi->txq.sta,
1338                                                     struct sta_info, sta);
1339                 cparams = &sta->cparams;
1340         } else {
1341                 cparams = &local->cparams;
1342         }
1343 
1344         if (flow == &txqi->def_flow)
1345                 cvars = &txqi->def_cvars;
1346         else
1347                 cvars = &local->cvars[flow - fq->flows];
1348 
1349         return codel_dequeue(txqi,
1350                              &flow->backlog,
1351                              cparams,
1352                              cvars,
1353                              cstats,
1354                              codel_skb_len_func,
1355                              codel_skb_time_func,
1356                              codel_drop_func,
1357                              codel_dequeue_func);
1358 }
1359 
1360 static void fq_skb_free_func(struct fq *fq,
1361                              struct fq_tin *tin,
1362                              struct fq_flow *flow,
1363                              struct sk_buff *skb)
1364 {
1365         struct ieee80211_local *local;
1366 
1367         local = container_of(fq, struct ieee80211_local, fq);
1368         ieee80211_free_txskb(&local->hw, skb);
1369 }
1370 
1371 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1372                                                 struct fq_tin *tin,
1373                                                 int idx,
1374                                                 struct sk_buff *skb)
1375 {
1376         struct txq_info *txqi;
1377 
1378         txqi = container_of(tin, struct txq_info, tin);
1379         return &txqi->def_flow;
1380 }
1381 
1382 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1383                                   struct txq_info *txqi,
1384                                   struct sk_buff *skb)
1385 {
1386         struct fq *fq = &local->fq;
1387         struct fq_tin *tin = &txqi->tin;
1388 
1389         ieee80211_set_skb_enqueue_time(skb);
1390         fq_tin_enqueue(fq, tin, skb,
1391                        fq_skb_free_func,
1392                        fq_flow_get_default_func);
1393 }
1394 
1395 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin,
1396                                 struct fq_flow *flow, struct sk_buff *skb,
1397                                 void *data)
1398 {
1399         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1400 
1401         return info->control.vif == data;
1402 }
1403 
1404 void ieee80211_txq_remove_vlan(struct ieee80211_local *local,
1405                                struct ieee80211_sub_if_data *sdata)
1406 {
1407         struct fq *fq = &local->fq;
1408         struct txq_info *txqi;
1409         struct fq_tin *tin;
1410         struct ieee80211_sub_if_data *ap;
1411 
1412         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1413                 return;
1414 
1415         ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1416 
1417         if (!ap->vif.txq)
1418                 return;
1419 
1420         txqi = to_txq_info(ap->vif.txq);
1421         tin = &txqi->tin;
1422 
1423         spin_lock_bh(&fq->lock);
1424         fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif,
1425                       fq_skb_free_func);
1426         spin_unlock_bh(&fq->lock);
1427 }
1428 
1429 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1430                         struct sta_info *sta,
1431                         struct txq_info *txqi, int tid)
1432 {
1433         fq_tin_init(&txqi->tin);
1434         fq_flow_init(&txqi->def_flow);
1435         codel_vars_init(&txqi->def_cvars);
1436         codel_stats_init(&txqi->cstats);
1437         __skb_queue_head_init(&txqi->frags);
1438 
1439         txqi->txq.vif = &sdata->vif;
1440 
1441         if (sta) {
1442                 txqi->txq.sta = &sta->sta;
1443                 sta->sta.txq[tid] = &txqi->txq;
1444                 txqi->txq.tid = tid;
1445                 txqi->txq.ac = ieee80211_ac_from_tid(tid);
1446         } else {
1447                 sdata->vif.txq = &txqi->txq;
1448                 txqi->txq.tid = 0;
1449                 txqi->txq.ac = IEEE80211_AC_BE;
1450         }
1451 }
1452 
1453 void ieee80211_txq_purge(struct ieee80211_local *local,
1454                          struct txq_info *txqi)
1455 {
1456         struct fq *fq = &local->fq;
1457         struct fq_tin *tin = &txqi->tin;
1458 
1459         fq_tin_reset(fq, tin, fq_skb_free_func);
1460         ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1461 }
1462 
1463 void ieee80211_txq_set_params(struct ieee80211_local *local)
1464 {
1465         if (local->hw.wiphy->txq_limit)
1466                 local->fq.limit = local->hw.wiphy->txq_limit;
1467         else
1468                 local->hw.wiphy->txq_limit = local->fq.limit;
1469 
1470         if (local->hw.wiphy->txq_memory_limit)
1471                 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit;
1472         else
1473                 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit;
1474 
1475         if (local->hw.wiphy->txq_quantum)
1476                 local->fq.quantum = local->hw.wiphy->txq_quantum;
1477         else
1478                 local->hw.wiphy->txq_quantum = local->fq.quantum;
1479 }
1480 
1481 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1482 {
1483         struct fq *fq = &local->fq;
1484         int ret;
1485         int i;
1486         bool supp_vht = false;
1487         enum nl80211_band band;
1488 
1489         if (!local->ops->wake_tx_queue)
1490                 return 0;
1491 
1492         ret = fq_init(fq, 4096);
1493         if (ret)
1494                 return ret;
1495 
1496         /*
1497          * If the hardware doesn't support VHT, it is safe to limit the maximum
1498          * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1499          */
1500         for (band = 0; band < NUM_NL80211_BANDS; band++) {
1501                 struct ieee80211_supported_band *sband;
1502 
1503                 sband = local->hw.wiphy->bands[band];
1504                 if (!sband)
1505                         continue;
1506 
1507                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1508         }
1509 
1510         if (!supp_vht)
1511                 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1512 
1513         codel_params_init(&local->cparams);
1514         local->cparams.interval = MS2TIME(100);
1515         local->cparams.target = MS2TIME(20);
1516         local->cparams.ecn = true;
1517 
1518         local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1519                                GFP_KERNEL);
1520         if (!local->cvars) {
1521                 spin_lock_bh(&fq->lock);
1522                 fq_reset(fq, fq_skb_free_func);
1523                 spin_unlock_bh(&fq->lock);
1524                 return -ENOMEM;
1525         }
1526 
1527         for (i = 0; i < fq->flows_cnt; i++)
1528                 codel_vars_init(&local->cvars[i]);
1529 
1530         ieee80211_txq_set_params(local);
1531 
1532         return 0;
1533 }
1534 
1535 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1536 {
1537         struct fq *fq = &local->fq;
1538 
1539         if (!local->ops->wake_tx_queue)
1540                 return;
1541 
1542         kfree(local->cvars);
1543         local->cvars = NULL;
1544 
1545         spin_lock_bh(&fq->lock);
1546         fq_reset(fq, fq_skb_free_func);
1547         spin_unlock_bh(&fq->lock);
1548 }
1549 
1550 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1551                                 struct ieee80211_sub_if_data *sdata,
1552                                 struct sta_info *sta,
1553                                 struct sk_buff *skb)
1554 {
1555         struct fq *fq = &local->fq;
1556         struct ieee80211_vif *vif;
1557         struct txq_info *txqi;
1558 
1559         if (!local->ops->wake_tx_queue ||
1560             sdata->vif.type == NL80211_IFTYPE_MONITOR)
1561                 return false;
1562 
1563         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1564                 sdata = container_of(sdata->bss,
1565                                      struct ieee80211_sub_if_data, u.ap);
1566 
1567         vif = &sdata->vif;
1568         txqi = ieee80211_get_txq(local, vif, sta, skb);
1569 
1570         if (!txqi)
1571                 return false;
1572 
1573         spin_lock_bh(&fq->lock);
1574         ieee80211_txq_enqueue(local, txqi, skb);
1575         spin_unlock_bh(&fq->lock);
1576 
1577         drv_wake_tx_queue(local, txqi);
1578 
1579         return true;
1580 }
1581 
1582 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1583                                struct ieee80211_vif *vif,
1584                                struct ieee80211_sta *sta,
1585                                struct sk_buff_head *skbs,
1586                                bool txpending)
1587 {
1588         struct ieee80211_tx_control control = {};
1589         struct sk_buff *skb, *tmp;
1590         unsigned long flags;
1591 
1592         skb_queue_walk_safe(skbs, skb, tmp) {
1593                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1594                 int q = info->hw_queue;
1595 
1596 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1597                 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1598                         __skb_unlink(skb, skbs);
1599                         ieee80211_free_txskb(&local->hw, skb);
1600                         continue;
1601                 }
1602 #endif
1603 
1604                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1605                 if (local->queue_stop_reasons[q] ||
1606                     (!txpending && !skb_queue_empty(&local->pending[q]))) {
1607                         if (unlikely(info->flags &
1608                                      IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1609                                 if (local->queue_stop_reasons[q] &
1610                                     ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1611                                         /*
1612                                          * Drop off-channel frames if queues
1613                                          * are stopped for any reason other
1614                                          * than off-channel operation. Never
1615                                          * queue them.
1616                                          */
1617                                         spin_unlock_irqrestore(
1618                                                 &local->queue_stop_reason_lock,
1619                                                 flags);
1620                                         ieee80211_purge_tx_queue(&local->hw,
1621                                                                  skbs);
1622                                         return true;
1623                                 }
1624                         } else {
1625 
1626                                 /*
1627                                  * Since queue is stopped, queue up frames for
1628                                  * later transmission from the tx-pending
1629                                  * tasklet when the queue is woken again.
1630                                  */
1631                                 if (txpending)
1632                                         skb_queue_splice_init(skbs,
1633                                                               &local->pending[q]);
1634                                 else
1635                                         skb_queue_splice_tail_init(skbs,
1636                                                                    &local->pending[q]);
1637 
1638                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1639                                                        flags);
1640                                 return false;
1641                         }
1642                 }
1643                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1644 
1645                 info->control.vif = vif;
1646                 control.sta = sta;
1647 
1648                 __skb_unlink(skb, skbs);
1649                 drv_tx(local, &control, skb);
1650         }
1651 
1652         return true;
1653 }
1654 
1655 /*
1656  * Returns false if the frame couldn't be transmitted but was queued instead.
1657  */
1658 static bool __ieee80211_tx(struct ieee80211_local *local,
1659                            struct sk_buff_head *skbs, int led_len,
1660                            struct sta_info *sta, bool txpending)
1661 {
1662         struct ieee80211_tx_info *info;
1663         struct ieee80211_sub_if_data *sdata;
1664         struct ieee80211_vif *vif;
1665         struct ieee80211_sta *pubsta;
1666         struct sk_buff *skb;
1667         bool result = true;
1668         __le16 fc;
1669 
1670         if (WARN_ON(skb_queue_empty(skbs)))
1671                 return true;
1672 
1673         skb = skb_peek(skbs);
1674         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1675         info = IEEE80211_SKB_CB(skb);
1676         sdata = vif_to_sdata(info->control.vif);
1677         if (sta && !sta->uploaded)
1678                 sta = NULL;
1679 
1680         if (sta)
1681                 pubsta = &sta->sta;
1682         else
1683                 pubsta = NULL;
1684 
1685         switch (sdata->vif.type) {
1686         case NL80211_IFTYPE_MONITOR:
1687                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1688                         vif = &sdata->vif;
1689                         break;
1690                 }
1691                 sdata = rcu_dereference(local->monitor_sdata);
1692                 if (sdata) {
1693                         vif = &sdata->vif;
1694                         info->hw_queue =
1695                                 vif->hw_queue[skb_get_queue_mapping(skb)];
1696                 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1697                         ieee80211_purge_tx_queue(&local->hw, skbs);
1698                         return true;
1699                 } else
1700                         vif = NULL;
1701                 break;
1702         case NL80211_IFTYPE_AP_VLAN:
1703                 sdata = container_of(sdata->bss,
1704                                      struct ieee80211_sub_if_data, u.ap);
1705                 /* fall through */
1706         default:
1707                 vif = &sdata->vif;
1708                 break;
1709         }
1710 
1711         result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1712                                     txpending);
1713 
1714         ieee80211_tpt_led_trig_tx(local, fc, led_len);
1715 
1716         WARN_ON_ONCE(!skb_queue_empty(skbs));
1717 
1718         return result;
1719 }
1720 
1721 /*
1722  * Invoke TX handlers, return 0 on success and non-zero if the
1723  * frame was dropped or queued.
1724  *
1725  * The handlers are split into an early and late part. The latter is everything
1726  * that can be sensitive to reordering, and will be deferred to after packets
1727  * are dequeued from the intermediate queues (when they are enabled).
1728  */
1729 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1730 {
1731         ieee80211_tx_result res = TX_DROP;
1732 
1733 #define CALL_TXH(txh) \
1734         do {                            \
1735                 res = txh(tx);          \
1736                 if (res != TX_CONTINUE) \
1737                         goto txh_done;  \
1738         } while (0)
1739 
1740         CALL_TXH(ieee80211_tx_h_dynamic_ps);
1741         CALL_TXH(ieee80211_tx_h_check_assoc);
1742         CALL_TXH(ieee80211_tx_h_ps_buf);
1743         CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1744         CALL_TXH(ieee80211_tx_h_select_key);
1745         if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1746                 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1747 
1748  txh_done:
1749         if (unlikely(res == TX_DROP)) {
1750                 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1751                 if (tx->skb)
1752                         ieee80211_free_txskb(&tx->local->hw, tx->skb);
1753                 else
1754                         ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1755                 return -1;
1756         } else if (unlikely(res == TX_QUEUED)) {
1757                 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1758                 return -1;
1759         }
1760 
1761         return 0;
1762 }
1763 
1764 /*
1765  * Late handlers can be called while the sta lock is held. Handlers that can
1766  * cause packets to be generated will cause deadlock!
1767  */
1768 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1769 {
1770         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1771         ieee80211_tx_result res = TX_CONTINUE;
1772 
1773         if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1774                 __skb_queue_tail(&tx->skbs, tx->skb);
1775                 tx->skb = NULL;
1776                 goto txh_done;
1777         }
1778 
1779         CALL_TXH(ieee80211_tx_h_michael_mic_add);
1780         CALL_TXH(ieee80211_tx_h_sequence);
1781         CALL_TXH(ieee80211_tx_h_fragment);
1782         /* handlers after fragment must be aware of tx info fragmentation! */
1783         CALL_TXH(ieee80211_tx_h_stats);
1784         CALL_TXH(ieee80211_tx_h_encrypt);
1785         if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1786                 CALL_TXH(ieee80211_tx_h_calculate_duration);
1787 #undef CALL_TXH
1788 
1789  txh_done:
1790         if (unlikely(res == TX_DROP)) {
1791                 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1792                 if (tx->skb)
1793                         ieee80211_free_txskb(&tx->local->hw, tx->skb);
1794                 else
1795                         ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1796                 return -1;
1797         } else if (unlikely(res == TX_QUEUED)) {
1798                 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1799                 return -1;
1800         }
1801 
1802         return 0;
1803 }
1804 
1805 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1806 {
1807         int r = invoke_tx_handlers_early(tx);
1808 
1809         if (r)
1810                 return r;
1811         return invoke_tx_handlers_late(tx);
1812 }
1813 
1814 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1815                               struct ieee80211_vif *vif, struct sk_buff *skb,
1816                               int band, struct ieee80211_sta **sta)
1817 {
1818         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1819         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1820         struct ieee80211_tx_data tx;
1821         struct sk_buff *skb2;
1822 
1823         if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1824                 return false;
1825 
1826         info->band = band;
1827         info->control.vif = vif;
1828         info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1829 
1830         if (invoke_tx_handlers(&tx))
1831                 return false;
1832 
1833         if (sta) {
1834                 if (tx.sta)
1835                         *sta = &tx.sta->sta;
1836                 else
1837                         *sta = NULL;
1838         }
1839 
1840         /* this function isn't suitable for fragmented data frames */
1841         skb2 = __skb_dequeue(&tx.skbs);
1842         if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1843                 ieee80211_free_txskb(hw, skb2);
1844                 ieee80211_purge_tx_queue(hw, &tx.skbs);
1845                 return false;
1846         }
1847 
1848         return true;
1849 }
1850 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1851 
1852 /*
1853  * Returns false if the frame couldn't be transmitted but was queued instead.
1854  */
1855 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1856                          struct sta_info *sta, struct sk_buff *skb,
1857                          bool txpending)
1858 {
1859         struct ieee80211_local *local = sdata->local;
1860         struct ieee80211_tx_data tx;
1861         ieee80211_tx_result res_prepare;
1862         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1863         bool result = true;
1864         int led_len;
1865 
1866         if (unlikely(skb->len < 10)) {
1867                 dev_kfree_skb(skb);
1868                 return true;
1869         }
1870 
1871         /* initialises tx */
1872         led_len = skb->len;
1873         res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1874 
1875         if (unlikely(res_prepare == TX_DROP)) {
1876                 ieee80211_free_txskb(&local->hw, skb);
1877                 return true;
1878         } else if (unlikely(res_prepare == TX_QUEUED)) {
1879                 return true;
1880         }
1881 
1882         /* set up hw_queue value early */
1883         if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1884             !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1885                 info->hw_queue =
1886                         sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1887 
1888         if (invoke_tx_handlers_early(&tx))
1889                 return true;
1890 
1891         if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1892                 return true;
1893 
1894         if (!invoke_tx_handlers_late(&tx))
1895                 result = __ieee80211_tx(local, &tx.skbs, led_len,
1896                                         tx.sta, txpending);
1897 
1898         return result;
1899 }
1900 
1901 /* device xmit handlers */
1902 
1903 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1904                                 struct sk_buff *skb,
1905                                 int head_need, bool may_encrypt)
1906 {
1907         struct ieee80211_local *local = sdata->local;
1908         int tail_need = 0;
1909 
1910         if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1911                 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1912                 tail_need -= skb_tailroom(skb);
1913                 tail_need = max_t(int, tail_need, 0);
1914         }
1915 
1916         if (skb_cloned(skb) &&
1917             (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1918              !skb_clone_writable(skb, ETH_HLEN) ||
1919              (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1920                 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1921         else if (head_need || tail_need)
1922                 I802_DEBUG_INC(local->tx_expand_skb_head);
1923         else
1924                 return 0;
1925 
1926         if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1927                 wiphy_debug(local->hw.wiphy,
1928                             "failed to reallocate TX buffer\n");
1929                 return -ENOMEM;
1930         }
1931 
1932         return 0;
1933 }
1934 
1935 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1936                     struct sta_info *sta, struct sk_buff *skb)
1937 {
1938         struct ieee80211_local *local = sdata->local;
1939         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1940         struct ieee80211_hdr *hdr;
1941         int headroom;
1942         bool may_encrypt;
1943 
1944         may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1945 
1946         headroom = local->tx_headroom;
1947         if (may_encrypt)
1948                 headroom += sdata->encrypt_headroom;
1949         headroom -= skb_headroom(skb);
1950         headroom = max_t(int, 0, headroom);
1951 
1952         if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1953                 ieee80211_free_txskb(&local->hw, skb);
1954                 return;
1955         }
1956 
1957         hdr = (struct ieee80211_hdr *) skb->data;
1958         info->control.vif = &sdata->vif;
1959 
1960         if (ieee80211_vif_is_mesh(&sdata->vif)) {
1961                 if (ieee80211_is_data(hdr->frame_control) &&
1962                     is_unicast_ether_addr(hdr->addr1)) {
1963                         if (mesh_nexthop_resolve(sdata, skb))
1964                                 return; /* skb queued: don't free */
1965                 } else {
1966                         ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1967                 }
1968         }
1969 
1970         ieee80211_set_qos_hdr(sdata, skb);
1971         ieee80211_tx(sdata, sta, skb, false);
1972 }
1973 
1974 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1975                                         struct sk_buff *skb)
1976 {
1977         struct ieee80211_radiotap_iterator iterator;
1978         struct ieee80211_radiotap_header *rthdr =
1979                 (struct ieee80211_radiotap_header *) skb->data;
1980         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1981         struct ieee80211_supported_band *sband =
1982                 local->hw.wiphy->bands[info->band];
1983         int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1984                                                    NULL);
1985         u16 txflags;
1986         u16 rate = 0;
1987         bool rate_found = false;
1988         u8 rate_retries = 0;
1989         u16 rate_flags = 0;
1990         u8 mcs_known, mcs_flags, mcs_bw;
1991         u16 vht_known;
1992         u8 vht_mcs = 0, vht_nss = 0;
1993         int i;
1994 
1995         info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1996                        IEEE80211_TX_CTL_DONTFRAG;
1997 
1998         /*
1999          * for every radiotap entry that is present
2000          * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
2001          * entries present, or -EINVAL on error)
2002          */
2003 
2004         while (!ret) {
2005                 ret = ieee80211_radiotap_iterator_next(&iterator);
2006 
2007                 if (ret)
2008                         continue;
2009 
2010                 /* see if this argument is something we can use */
2011                 switch (iterator.this_arg_index) {
2012                 /*
2013                  * You must take care when dereferencing iterator.this_arg
2014                  * for multibyte types... the pointer is not aligned.  Use
2015                  * get_unaligned((type *)iterator.this_arg) to dereference
2016                  * iterator.this_arg for type "type" safely on all arches.
2017                 */
2018                 case IEEE80211_RADIOTAP_FLAGS:
2019                         if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
2020                                 /*
2021                                  * this indicates that the skb we have been
2022                                  * handed has the 32-bit FCS CRC at the end...
2023                                  * we should react to that by snipping it off
2024                                  * because it will be recomputed and added
2025                                  * on transmission
2026                                  */
2027                                 if (skb->len < (iterator._max_length + FCS_LEN))
2028                                         return false;
2029 
2030                                 skb_trim(skb, skb->len - FCS_LEN);
2031                         }
2032                         if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
2033                                 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
2034                         if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
2035                                 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
2036                         break;
2037 
2038                 case IEEE80211_RADIOTAP_TX_FLAGS:
2039                         txflags = get_unaligned_le16(iterator.this_arg);
2040                         if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
2041                                 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2042                         break;
2043 
2044                 case IEEE80211_RADIOTAP_RATE:
2045                         rate = *iterator.this_arg;
2046                         rate_flags = 0;
2047                         rate_found = true;
2048                         break;
2049 
2050                 case IEEE80211_RADIOTAP_DATA_RETRIES:
2051                         rate_retries = *iterator.this_arg;
2052                         break;
2053 
2054                 case IEEE80211_RADIOTAP_MCS:
2055                         mcs_known = iterator.this_arg[0];
2056                         mcs_flags = iterator.this_arg[1];
2057                         if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2058                                 break;
2059 
2060                         rate_found = true;
2061                         rate = iterator.this_arg[2];
2062                         rate_flags = IEEE80211_TX_RC_MCS;
2063 
2064                         if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2065                             mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2066                                 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2067 
2068                         mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2069                         if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2070                             mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2071                                 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2072                         break;
2073 
2074                 case IEEE80211_RADIOTAP_VHT:
2075                         vht_known = get_unaligned_le16(iterator.this_arg);
2076                         rate_found = true;
2077 
2078                         rate_flags = IEEE80211_TX_RC_VHT_MCS;
2079                         if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2080                             (iterator.this_arg[2] &
2081                              IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2082                                 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2083                         if (vht_known &
2084                             IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2085                                 if (iterator.this_arg[3] == 1)
2086                                         rate_flags |=
2087                                                 IEEE80211_TX_RC_40_MHZ_WIDTH;
2088                                 else if (iterator.this_arg[3] == 4)
2089                                         rate_flags |=
2090                                                 IEEE80211_TX_RC_80_MHZ_WIDTH;
2091                                 else if (iterator.this_arg[3] == 11)
2092                                         rate_flags |=
2093                                                 IEEE80211_TX_RC_160_MHZ_WIDTH;
2094                         }
2095 
2096                         vht_mcs = iterator.this_arg[4] >> 4;
2097                         vht_nss = iterator.this_arg[4] & 0xF;
2098                         break;
2099 
2100                 /*
2101                  * Please update the file
2102                  * Documentation/networking/mac80211-injection.txt
2103                  * when parsing new fields here.
2104                  */
2105 
2106                 default:
2107                         break;
2108                 }
2109         }
2110 
2111         if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2112                 return false;
2113 
2114         if (rate_found) {
2115                 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2116 
2117                 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2118                         info->control.rates[i].idx = -1;
2119                         info->control.rates[i].flags = 0;
2120                         info->control.rates[i].count = 0;
2121                 }
2122 
2123                 if (rate_flags & IEEE80211_TX_RC_MCS) {
2124                         info->control.rates[0].idx = rate;
2125                 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2126                         ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2127                                                vht_nss);
2128                 } else {
2129                         for (i = 0; i < sband->n_bitrates; i++) {
2130                                 if (rate * 5 != sband->bitrates[i].bitrate)
2131                                         continue;
2132 
2133                                 info->control.rates[0].idx = i;
2134                                 break;
2135                         }
2136                 }
2137 
2138                 if (info->control.rates[0].idx < 0)
2139                         info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2140 
2141                 info->control.rates[0].flags = rate_flags;
2142                 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2143                                                      local->hw.max_rate_tries);
2144         }
2145 
2146         /*
2147          * remove the radiotap header
2148          * iterator->_max_length was sanity-checked against
2149          * skb->len by iterator init
2150          */
2151         skb_pull(skb, iterator._max_length);
2152 
2153         return true;
2154 }
2155 
2156 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2157                                          struct net_device *dev)
2158 {
2159         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2160         struct ieee80211_chanctx_conf *chanctx_conf;
2161         struct ieee80211_radiotap_header *prthdr =
2162                 (struct ieee80211_radiotap_header *)skb->data;
2163         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2164         struct ieee80211_hdr *hdr;
2165         struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2166         struct cfg80211_chan_def *chandef;
2167         u16 len_rthdr;
2168         int hdrlen;
2169 
2170         /* check for not even having the fixed radiotap header part */
2171         if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2172                 goto fail; /* too short to be possibly valid */
2173 
2174         /* is it a header version we can trust to find length from? */
2175         if (unlikely(prthdr->it_version))
2176                 goto fail; /* only version 0 is supported */
2177 
2178         /* then there must be a radiotap header with a length we can use */
2179         len_rthdr = ieee80211_get_radiotap_len(skb->data);
2180 
2181         /* does the skb contain enough to deliver on the alleged length? */
2182         if (unlikely(skb->len < len_rthdr))
2183                 goto fail; /* skb too short for claimed rt header extent */
2184 
2185         /*
2186          * fix up the pointers accounting for the radiotap
2187          * header still being in there.  We are being given
2188          * a precooked IEEE80211 header so no need for
2189          * normal processing
2190          */
2191         skb_set_mac_header(skb, len_rthdr);
2192         /*
2193          * these are just fixed to the end of the rt area since we
2194          * don't have any better information and at this point, nobody cares
2195          */
2196         skb_set_network_header(skb, len_rthdr);
2197         skb_set_transport_header(skb, len_rthdr);
2198 
2199         if (skb->len < len_rthdr + 2)
2200                 goto fail;
2201 
2202         hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2203         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2204 
2205         if (skb->len < len_rthdr + hdrlen)
2206                 goto fail;
2207 
2208         /*
2209          * Initialize skb->protocol if the injected frame is a data frame
2210          * carrying a rfc1042 header
2211          */
2212         if (ieee80211_is_data(hdr->frame_control) &&
2213             skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2214                 u8 *payload = (u8 *)hdr + hdrlen;
2215 
2216                 if (ether_addr_equal(payload, rfc1042_header))
2217                         skb->protocol = cpu_to_be16((payload[6] << 8) |
2218                                                     payload[7]);
2219         }
2220 
2221         memset(info, 0, sizeof(*info));
2222 
2223         info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2224                       IEEE80211_TX_CTL_INJECTED;
2225 
2226         rcu_read_lock();
2227 
2228         /*
2229          * We process outgoing injected frames that have a local address
2230          * we handle as though they are non-injected frames.
2231          * This code here isn't entirely correct, the local MAC address
2232          * isn't always enough to find the interface to use; for proper
2233          * VLAN/WDS support we will need a different mechanism (which
2234          * likely isn't going to be monitor interfaces).
2235          */
2236         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2237 
2238         list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2239                 if (!ieee80211_sdata_running(tmp_sdata))
2240                         continue;
2241                 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2242                     tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2243                     tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2244                         continue;
2245                 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2246                         sdata = tmp_sdata;
2247                         break;
2248                 }
2249         }
2250 
2251         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2252         if (!chanctx_conf) {
2253                 tmp_sdata = rcu_dereference(local->monitor_sdata);
2254                 if (tmp_sdata)
2255                         chanctx_conf =
2256                                 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2257         }
2258 
2259         if (chanctx_conf)
2260                 chandef = &chanctx_conf->def;
2261         else if (!local->use_chanctx)
2262                 chandef = &local->_oper_chandef;
2263         else
2264                 goto fail_rcu;
2265 
2266         /*
2267          * Frame injection is not allowed if beaconing is not allowed
2268          * or if we need radar detection. Beaconing is usually not allowed when
2269          * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2270          * Passive scan is also used in world regulatory domains where
2271          * your country is not known and as such it should be treated as
2272          * NO TX unless the channel is explicitly allowed in which case
2273          * your current regulatory domain would not have the passive scan
2274          * flag.
2275          *
2276          * Since AP mode uses monitor interfaces to inject/TX management
2277          * frames we can make AP mode the exception to this rule once it
2278          * supports radar detection as its implementation can deal with
2279          * radar detection by itself. We can do that later by adding a
2280          * monitor flag interfaces used for AP support.
2281          */
2282         if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2283                                      sdata->vif.type))
2284                 goto fail_rcu;
2285 
2286         info->band = chandef->chan->band;
2287 
2288         /* process and remove the injection radiotap header */
2289         if (!ieee80211_parse_tx_radiotap(local, skb))
2290                 goto fail_rcu;
2291 
2292         ieee80211_xmit(sdata, NULL, skb);
2293         rcu_read_unlock();
2294 
2295         return NETDEV_TX_OK;
2296 
2297 fail_rcu:
2298         rcu_read_unlock();
2299 fail:
2300         dev_kfree_skb(skb);
2301         return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2302 }
2303 
2304 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2305 {
2306         u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2307 
2308         return ethertype == ETH_P_TDLS &&
2309                skb->len > 14 &&
2310                skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2311 }
2312 
2313 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2314                                    struct sk_buff *skb,
2315                                    struct sta_info **sta_out)
2316 {
2317         struct sta_info *sta;
2318 
2319         switch (sdata->vif.type) {
2320         case NL80211_IFTYPE_AP_VLAN:
2321                 sta = rcu_dereference(sdata->u.vlan.sta);
2322                 if (sta) {
2323                         *sta_out = sta;
2324                         return 0;
2325                 } else if (sdata->wdev.use_4addr) {
2326                         return -ENOLINK;
2327                 }
2328                 /* fall through */
2329         case NL80211_IFTYPE_AP:
2330         case NL80211_IFTYPE_OCB:
2331         case NL80211_IFTYPE_ADHOC:
2332                 if (is_multicast_ether_addr(skb->data)) {
2333                         *sta_out = ERR_PTR(-ENOENT);
2334                         return 0;
2335                 }
2336                 sta = sta_info_get_bss(sdata, skb->data);
2337                 break;
2338         case NL80211_IFTYPE_WDS:
2339                 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2340                 break;
2341 #ifdef CONFIG_MAC80211_MESH
2342         case NL80211_IFTYPE_MESH_POINT:
2343                 /* determined much later */
2344                 *sta_out = NULL;
2345                 return 0;
2346 #endif
2347         case NL80211_IFTYPE_STATION:
2348                 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2349                         sta = sta_info_get(sdata, skb->data);
2350                         if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2351                                 if (test_sta_flag(sta,
2352                                                   WLAN_STA_TDLS_PEER_AUTH)) {
2353                                         *sta_out = sta;
2354                                         return 0;
2355                                 }
2356 
2357                                 /*
2358                                  * TDLS link during setup - throw out frames to
2359                                  * peer. Allow TDLS-setup frames to unauthorized
2360                                  * peers for the special case of a link teardown
2361                                  * after a TDLS sta is removed due to being
2362                                  * unreachable.
2363                                  */
2364                                 if (!ieee80211_is_tdls_setup(skb))
2365                                         return -EINVAL;
2366                         }
2367 
2368                 }
2369 
2370                 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2371                 if (!sta)
2372                         return -ENOLINK;
2373                 break;
2374         default:
2375                 return -EINVAL;
2376         }
2377 
2378         *sta_out = sta ?: ERR_PTR(-ENOENT);
2379         return 0;
2380 }
2381 
2382 /**
2383  * ieee80211_build_hdr - build 802.11 header in the given frame
2384  * @sdata: virtual interface to build the header for
2385  * @skb: the skb to build the header in
2386  * @info_flags: skb flags to set
2387  *
2388  * This function takes the skb with 802.3 header and reformats the header to
2389  * the appropriate IEEE 802.11 header based on which interface the packet is
2390  * being transmitted on.
2391  *
2392  * Note that this function also takes care of the TX status request and
2393  * potential unsharing of the SKB - this needs to be interleaved with the
2394  * header building.
2395  *
2396  * The function requires the read-side RCU lock held
2397  *
2398  * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2399  */
2400 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2401                                            struct sk_buff *skb, u32 info_flags,
2402                                            struct sta_info *sta)
2403 {
2404         struct ieee80211_local *local = sdata->local;
2405         struct ieee80211_tx_info *info;
2406         int head_need;
2407         u16 ethertype, hdrlen,  meshhdrlen = 0;
2408         __le16 fc;
2409         struct ieee80211_hdr hdr;
2410         struct ieee80211s_hdr mesh_hdr __maybe_unused;
2411         struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2412         const u8 *encaps_data;
2413         int encaps_len, skip_header_bytes;
2414         bool wme_sta = false, authorized = false;
2415         bool tdls_peer;
2416         bool multicast;
2417         u16 info_id = 0;
2418         struct ieee80211_chanctx_conf *chanctx_conf;
2419         struct ieee80211_sub_if_data *ap_sdata;
2420         enum nl80211_band band;
2421         int ret;
2422 
2423         if (IS_ERR(sta))
2424                 sta = NULL;
2425 
2426         /* convert Ethernet header to proper 802.11 header (based on
2427          * operation mode) */
2428         ethertype = (skb->data[12] << 8) | skb->data[13];
2429         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2430 
2431         switch (sdata->vif.type) {
2432         case NL80211_IFTYPE_AP_VLAN:
2433                 if (sdata->wdev.use_4addr) {
2434                         fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2435                         /* RA TA DA SA */
2436                         memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2437                         memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2438                         memcpy(hdr.addr3, skb->data, ETH_ALEN);
2439                         memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2440                         hdrlen = 30;
2441                         authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2442                         wme_sta = sta->sta.wme;
2443                 }
2444                 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2445                                         u.ap);
2446                 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2447                 if (!chanctx_conf) {
2448                         ret = -ENOTCONN;
2449                         goto free;
2450                 }
2451                 band = chanctx_conf->def.chan->band;
2452                 if (sdata->wdev.use_4addr)
2453                         break;
2454                 /* fall through */
2455         case NL80211_IFTYPE_AP:
2456                 if (sdata->vif.type == NL80211_IFTYPE_AP)
2457                         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2458                 if (!chanctx_conf) {
2459                         ret = -ENOTCONN;
2460                         goto free;
2461                 }
2462                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2463                 /* DA BSSID SA */
2464                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2465                 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2466                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2467                 hdrlen = 24;
2468                 band = chanctx_conf->def.chan->band;
2469                 break;
2470         case NL80211_IFTYPE_WDS:
2471                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2472                 /* RA TA DA SA */
2473                 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2474                 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2475                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2476                 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2477                 hdrlen = 30;
2478                 /*
2479                  * This is the exception! WDS style interfaces are prohibited
2480                  * when channel contexts are in used so this must be valid
2481                  */
2482                 band = local->hw.conf.chandef.chan->band;
2483                 break;
2484 #ifdef CONFIG_MAC80211_MESH
2485         case NL80211_IFTYPE_MESH_POINT:
2486                 if (!is_multicast_ether_addr(skb->data)) {
2487                         struct sta_info *next_hop;
2488                         bool mpp_lookup = true;
2489 
2490                         mpath = mesh_path_lookup(sdata, skb->data);
2491                         if (mpath) {
2492                                 mpp_lookup = false;
2493                                 next_hop = rcu_dereference(mpath->next_hop);
2494                                 if (!next_hop ||
2495                                     !(mpath->flags & (MESH_PATH_ACTIVE |
2496                                                       MESH_PATH_RESOLVING)))
2497                                         mpp_lookup = true;
2498                         }
2499 
2500                         if (mpp_lookup) {
2501                                 mppath = mpp_path_lookup(sdata, skb->data);
2502                                 if (mppath)
2503                                         mppath->exp_time = jiffies;
2504                         }
2505 
2506                         if (mppath && mpath)
2507                                 mesh_path_del(sdata, mpath->dst);
2508                 }
2509 
2510                 /*
2511                  * Use address extension if it is a packet from
2512                  * another interface or if we know the destination
2513                  * is being proxied by a portal (i.e. portal address
2514                  * differs from proxied address)
2515                  */
2516                 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2517                     !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2518                         hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2519                                         skb->data, skb->data + ETH_ALEN);
2520                         meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2521                                                                NULL, NULL);
2522                 } else {
2523                         /* DS -> MBSS (802.11-2012 13.11.3.3).
2524                          * For unicast with unknown forwarding information,
2525                          * destination might be in the MBSS or if that fails
2526                          * forwarded to another mesh gate. In either case
2527                          * resolution will be handled in ieee80211_xmit(), so
2528                          * leave the original DA. This also works for mcast */
2529                         const u8 *mesh_da = skb->data;
2530 
2531                         if (mppath)
2532                                 mesh_da = mppath->mpp;
2533                         else if (mpath)
2534                                 mesh_da = mpath->dst;
2535 
2536                         hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2537                                         mesh_da, sdata->vif.addr);
2538                         if (is_multicast_ether_addr(mesh_da))
2539                                 /* DA TA mSA AE:SA */
2540                                 meshhdrlen = ieee80211_new_mesh_header(
2541                                                 sdata, &mesh_hdr,
2542                                                 skb->data + ETH_ALEN, NULL);
2543                         else
2544                                 /* RA TA mDA mSA AE:DA SA */
2545                                 meshhdrlen = ieee80211_new_mesh_header(
2546                                                 sdata, &mesh_hdr, skb->data,
2547                                                 skb->data + ETH_ALEN);
2548 
2549                 }
2550                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2551                 if (!chanctx_conf) {
2552                         ret = -ENOTCONN;
2553                         goto free;
2554                 }
2555                 band = chanctx_conf->def.chan->band;
2556                 break;
2557 #endif
2558         case NL80211_IFTYPE_STATION:
2559                 /* we already did checks when looking up the RA STA */
2560                 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2561 
2562                 if (tdls_peer) {
2563                         /* DA SA BSSID */
2564                         memcpy(hdr.addr1, skb->data, ETH_ALEN);
2565                         memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2566                         memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2567                         hdrlen = 24;
2568                 }  else if (sdata->u.mgd.use_4addr &&
2569                             cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2570                         fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2571                                           IEEE80211_FCTL_TODS);
2572                         /* RA TA DA SA */
2573                         memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2574                         memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2575                         memcpy(hdr.addr3, skb->data, ETH_ALEN);
2576                         memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2577                         hdrlen = 30;
2578                 } else {
2579                         fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2580                         /* BSSID SA DA */
2581                         memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2582                         memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2583                         memcpy(hdr.addr3, skb->data, ETH_ALEN);
2584                         hdrlen = 24;
2585                 }
2586                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2587                 if (!chanctx_conf) {
2588                         ret = -ENOTCONN;
2589                         goto free;
2590                 }
2591                 band = chanctx_conf->def.chan->band;
2592                 break;
2593         case NL80211_IFTYPE_OCB:
2594                 /* DA SA BSSID */
2595                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2596                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2597                 eth_broadcast_addr(hdr.addr3);
2598                 hdrlen = 24;
2599                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2600                 if (!chanctx_conf) {
2601                         ret = -ENOTCONN;
2602                         goto free;
2603                 }
2604                 band = chanctx_conf->def.chan->band;
2605                 break;
2606         case NL80211_IFTYPE_ADHOC:
2607                 /* DA SA BSSID */
2608                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2609                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2610                 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2611                 hdrlen = 24;
2612                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2613                 if (!chanctx_conf) {
2614                         ret = -ENOTCONN;
2615                         goto free;
2616                 }
2617                 band = chanctx_conf->def.chan->band;
2618                 break;
2619         default:
2620                 ret = -EINVAL;
2621                 goto free;
2622         }
2623 
2624         multicast = is_multicast_ether_addr(hdr.addr1);
2625 
2626         /* sta is always NULL for mesh */
2627         if (sta) {
2628                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2629                 wme_sta = sta->sta.wme;
2630         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2631                 /* For mesh, the use of the QoS header is mandatory */
2632                 wme_sta = true;
2633         }
2634 
2635         /* receiver does QoS (which also means we do) use it */
2636         if (wme_sta) {
2637                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2638                 hdrlen += 2;
2639         }
2640 
2641         /*
2642          * Drop unicast frames to unauthorised stations unless they are
2643          * EAPOL frames from the local station.
2644          */
2645         if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2646                      (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2647                      !multicast && !authorized &&
2648                      (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2649                       !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2650 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2651                 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2652                                     sdata->name, hdr.addr1);
2653 #endif
2654 
2655                 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2656 
2657                 ret = -EPERM;
2658                 goto free;
2659         }
2660 
2661         if (unlikely(!multicast && skb->sk &&
2662                      skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2663                 struct sk_buff *ack_skb = skb_clone_sk(skb);
2664 
2665                 if (ack_skb) {
2666                         unsigned long flags;
2667                         int id;
2668 
2669                         spin_lock_irqsave(&local->ack_status_lock, flags);
2670                         id = idr_alloc(&local->ack_status_frames, ack_skb,
2671                                        1, 0x10000, GFP_ATOMIC);
2672                         spin_unlock_irqrestore(&local->ack_status_lock, flags);
2673 
2674                         if (id >= 0) {
2675                                 info_id = id;
2676                                 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2677                         } else {
2678                                 kfree_skb(ack_skb);
2679                         }
2680                 }
2681         }
2682 
2683         /*
2684          * If the skb is shared we need to obtain our own copy.
2685          */
2686         if (skb_shared(skb)) {
2687                 struct sk_buff *tmp_skb = skb;
2688 
2689                 /* can't happen -- skb is a clone if info_id != 0 */
2690                 WARN_ON(info_id);
2691 
2692                 skb = skb_clone(skb, GFP_ATOMIC);
2693                 kfree_skb(tmp_skb);
2694 
2695                 if (!skb) {
2696                         ret = -ENOMEM;
2697                         goto free;
2698                 }
2699         }
2700 
2701         hdr.frame_control = fc;
2702         hdr.duration_id = 0;
2703         hdr.seq_ctrl = 0;
2704 
2705         skip_header_bytes = ETH_HLEN;
2706         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2707                 encaps_data = bridge_tunnel_header;
2708                 encaps_len = sizeof(bridge_tunnel_header);
2709                 skip_header_bytes -= 2;
2710         } else if (ethertype >= ETH_P_802_3_MIN) {
2711                 encaps_data = rfc1042_header;
2712                 encaps_len = sizeof(rfc1042_header);
2713                 skip_header_bytes -= 2;
2714         } else {
2715                 encaps_data = NULL;
2716                 encaps_len = 0;
2717         }
2718 
2719         skb_pull(skb, skip_header_bytes);
2720         head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2721 
2722         /*
2723          * So we need to modify the skb header and hence need a copy of
2724          * that. The head_need variable above doesn't, so far, include
2725          * the needed header space that we don't need right away. If we
2726          * can, then we don't reallocate right now but only after the
2727          * frame arrives at the master device (if it does...)
2728          *
2729          * If we cannot, however, then we will reallocate to include all
2730          * the ever needed space. Also, if we need to reallocate it anyway,
2731          * make it big enough for everything we may ever need.
2732          */
2733 
2734         if (head_need > 0 || skb_cloned(skb)) {
2735                 head_need += sdata->encrypt_headroom;
2736                 head_need += local->tx_headroom;
2737                 head_need = max_t(int, 0, head_need);
2738                 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2739                         ieee80211_free_txskb(&local->hw, skb);
2740                         skb = NULL;
2741                         return ERR_PTR(-ENOMEM);
2742                 }
2743         }
2744 
2745         if (encaps_data)
2746                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2747 
2748 #ifdef CONFIG_MAC80211_MESH
2749         if (meshhdrlen > 0)
2750                 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2751 #endif
2752 
2753         if (ieee80211_is_data_qos(fc)) {
2754                 __le16 *qos_control;
2755 
2756                 qos_control = skb_push(skb, 2);
2757                 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2758                 /*
2759                  * Maybe we could actually set some fields here, for now just
2760                  * initialise to zero to indicate no special operation.
2761                  */
2762                 *qos_control = 0;
2763         } else
2764                 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2765 
2766         skb_reset_mac_header(skb);
2767 
2768         info = IEEE80211_SKB_CB(skb);
2769         memset(info, 0, sizeof(*info));
2770 
2771         info->flags = info_flags;
2772         info->ack_frame_id = info_id;
2773         info->band = band;
2774 
2775         return skb;
2776  free:
2777         kfree_skb(skb);
2778         return ERR_PTR(ret);
2779 }
2780 
2781 /*
2782  * fast-xmit overview
2783  *
2784  * The core idea of this fast-xmit is to remove per-packet checks by checking
2785  * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2786  * checks that are needed to get the sta->fast_tx pointer assigned, after which
2787  * much less work can be done per packet. For example, fragmentation must be
2788  * disabled or the fast_tx pointer will not be set. All the conditions are seen
2789  * in the code here.
2790  *
2791  * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2792  * header and other data to aid packet processing in ieee80211_xmit_fast().
2793  *
2794  * The most difficult part of this is that when any of these assumptions
2795  * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2796  * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2797  * since the per-packet code no longer checks the conditions. This is reflected
2798  * by the calls to these functions throughout the rest of the code, and must be
2799  * maintained if any of the TX path checks change.
2800  */
2801 
2802 void ieee80211_check_fast_xmit(struct sta_info *sta)
2803 {
2804         struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2805         struct ieee80211_local *local = sta->local;
2806         struct ieee80211_sub_if_data *sdata = sta->sdata;
2807         struct ieee80211_hdr *hdr = (void *)build.hdr;
2808         struct ieee80211_chanctx_conf *chanctx_conf;
2809         __le16 fc;
2810 
2811         if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2812                 return;
2813 
2814         /* Locking here protects both the pointer itself, and against concurrent
2815          * invocations winning data access races to, e.g., the key pointer that
2816          * is used.
2817          * Without it, the invocation of this function right after the key
2818          * pointer changes wouldn't be sufficient, as another CPU could access
2819          * the pointer, then stall, and then do the cache update after the CPU
2820          * that invalidated the key.
2821          * With the locking, such scenarios cannot happen as the check for the
2822          * key and the fast-tx assignment are done atomically, so the CPU that
2823          * modifies the key will either wait or other one will see the key
2824          * cleared/changed already.
2825          */
2826         spin_lock_bh(&sta->lock);
2827         if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2828             !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2829             sdata->vif.type == NL80211_IFTYPE_STATION)
2830                 goto out;
2831 
2832         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2833                 goto out;
2834 
2835         if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2836             test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2837             test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2838             test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2839                 goto out;
2840 
2841         if (sdata->noack_map)
2842                 goto out;
2843 
2844         /* fast-xmit doesn't handle fragmentation at all */
2845         if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2846             !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
2847                 goto out;
2848 
2849         rcu_read_lock();
2850         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2851         if (!chanctx_conf) {
2852                 rcu_read_unlock();
2853                 goto out;
2854         }
2855         build.band = chanctx_conf->def.chan->band;
2856         rcu_read_unlock();
2857 
2858         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2859 
2860         switch (sdata->vif.type) {
2861         case NL80211_IFTYPE_ADHOC:
2862                 /* DA SA BSSID */
2863                 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2864                 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2865                 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2866                 build.hdr_len = 24;
2867                 break;
2868         case NL80211_IFTYPE_STATION:
2869                 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2870                         /* DA SA BSSID */
2871                         build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2872                         build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2873                         memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2874                         build.hdr_len = 24;
2875                         break;
2876                 }
2877 
2878                 if (sdata->u.mgd.use_4addr) {
2879                         /* non-regular ethertype cannot use the fastpath */
2880                         fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2881                                           IEEE80211_FCTL_TODS);
2882                         /* RA TA DA SA */
2883                         memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2884                         memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2885                         build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2886                         build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2887                         build.hdr_len = 30;
2888                         break;
2889                 }
2890                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2891                 /* BSSID SA DA */
2892                 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2893                 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2894                 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2895                 build.hdr_len = 24;
2896                 break;
2897         case NL80211_IFTYPE_AP_VLAN:
2898                 if (sdata->wdev.use_4addr) {
2899                         fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2900                                           IEEE80211_FCTL_TODS);
2901                         /* RA TA DA SA */
2902                         memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2903                         memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2904                         build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2905                         build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2906                         build.hdr_len = 30;
2907                         break;
2908                 }
2909                 /* fall through */
2910         case NL80211_IFTYPE_AP:
2911                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2912                 /* DA BSSID SA */
2913                 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2914                 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2915                 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2916                 build.hdr_len = 24;
2917                 break;
2918         default:
2919                 /* not handled on fast-xmit */
2920                 goto out;
2921         }
2922 
2923         if (sta->sta.wme) {
2924                 build.hdr_len += 2;
2925                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2926         }
2927 
2928         /* We store the key here so there's no point in using rcu_dereference()
2929          * but that's fine because the code that changes the pointers will call
2930          * this function after doing so. For a single CPU that would be enough,
2931          * for multiple see the comment above.
2932          */
2933         build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2934         if (!build.key)
2935                 build.key = rcu_access_pointer(sdata->default_unicast_key);
2936         if (build.key) {
2937                 bool gen_iv, iv_spc, mmic;
2938 
2939                 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2940                 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2941                 mmic = build.key->conf.flags &
2942                         (IEEE80211_KEY_FLAG_GENERATE_MMIC |
2943                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE);
2944 
2945                 /* don't handle software crypto */
2946                 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2947                         goto out;
2948 
2949                 switch (build.key->conf.cipher) {
2950                 case WLAN_CIPHER_SUITE_CCMP:
2951                 case WLAN_CIPHER_SUITE_CCMP_256:
2952                         /* add fixed key ID */
2953                         if (gen_iv) {
2954                                 (build.hdr + build.hdr_len)[3] =
2955                                         0x20 | (build.key->conf.keyidx << 6);
2956                                 build.pn_offs = build.hdr_len;
2957                         }
2958                         if (gen_iv || iv_spc)
2959                                 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2960                         break;
2961                 case WLAN_CIPHER_SUITE_GCMP:
2962                 case WLAN_CIPHER_SUITE_GCMP_256:
2963                         /* add fixed key ID */
2964                         if (gen_iv) {
2965                                 (build.hdr + build.hdr_len)[3] =
2966                                         0x20 | (build.key->conf.keyidx << 6);
2967                                 build.pn_offs = build.hdr_len;
2968                         }
2969                         if (gen_iv || iv_spc)
2970                                 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2971                         break;
2972                 case WLAN_CIPHER_SUITE_TKIP:
2973                         /* cannot handle MMIC or IV generation in xmit-fast */
2974                         if (mmic || gen_iv)
2975                                 goto out;
2976                         if (iv_spc)
2977                                 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2978                         break;
2979                 case WLAN_CIPHER_SUITE_WEP40:
2980                 case WLAN_CIPHER_SUITE_WEP104:
2981                         /* cannot handle IV generation in fast-xmit */
2982                         if (gen_iv)
2983                                 goto out;
2984                         if (iv_spc)
2985                                 build.hdr_len += IEEE80211_WEP_IV_LEN;
2986                         break;
2987                 case WLAN_CIPHER_SUITE_AES_CMAC:
2988                 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2989                 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2990                 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2991                         WARN(1,
2992                              "management cipher suite 0x%x enabled for data\n",
2993                              build.key->conf.cipher);
2994                         goto out;
2995                 default:
2996                         /* we don't know how to generate IVs for this at all */
2997                         if (WARN_ON(gen_iv))
2998                                 goto out;
2999                         /* pure hardware keys are OK, of course */
3000                         if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
3001                                 break;
3002                         /* cipher scheme might require space allocation */
3003                         if (iv_spc &&
3004                             build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
3005                                 goto out;
3006                         if (iv_spc)
3007                                 build.hdr_len += build.key->conf.iv_len;
3008                 }
3009 
3010                 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
3011         }
3012 
3013         hdr->frame_control = fc;
3014 
3015         memcpy(build.hdr + build.hdr_len,
3016                rfc1042_header,  sizeof(rfc1042_header));
3017         build.hdr_len += sizeof(rfc1042_header);
3018 
3019         fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
3020         /* if the kmemdup fails, continue w/o fast_tx */
3021         if (!fast_tx)
3022                 goto out;
3023 
3024  out:
3025         /* we might have raced against another call to this function */
3026         old = rcu_dereference_protected(sta->fast_tx,
3027                                         lockdep_is_held(&sta->lock));
3028         rcu_assign_pointer(sta->fast_tx, fast_tx);
3029         if (old)
3030                 kfree_rcu(old, rcu_head);
3031         spin_unlock_bh(&sta->lock);
3032 }
3033 
3034 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
3035 {
3036         struct sta_info *sta;
3037 
3038         rcu_read_lock();
3039         list_for_each_entry_rcu(sta, &local->sta_list, list)
3040                 ieee80211_check_fast_xmit(sta);
3041         rcu_read_unlock();
3042 }
3043 
3044 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
3045 {
3046         struct ieee80211_local *local = sdata->local;
3047         struct sta_info *sta;
3048 
3049         rcu_read_lock();
3050 
3051         list_for_each_entry_rcu(sta, &local->sta_list, list) {
3052                 if (sdata != sta->sdata &&
3053                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3054                         continue;
3055                 ieee80211_check_fast_xmit(sta);
3056         }
3057 
3058         rcu_read_unlock();
3059 }
3060 
3061 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3062 {
3063         struct ieee80211_fast_tx *fast_tx;
3064 
3065         spin_lock_bh(&sta->lock);
3066         fast_tx = rcu_dereference_protected(sta->fast_tx,
3067                                             lockdep_is_held(&sta->lock));
3068         RCU_INIT_POINTER(sta->fast_tx, NULL);
3069         spin_unlock_bh(&sta->lock);
3070 
3071         if (fast_tx)
3072                 kfree_rcu(fast_tx, rcu_head);
3073 }
3074 
3075 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3076                                         struct sk_buff *skb, int headroom)
3077 {
3078         if (skb_headroom(skb) < headroom) {
3079                 I802_DEBUG_INC(local->tx_expand_skb_head);
3080 
3081                 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
3082                         wiphy_debug(local->hw.wiphy,
3083                                     "failed to reallocate TX buffer\n");
3084                         return false;
3085                 }
3086         }
3087 
3088         return true;
3089 }
3090 
3091 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3092                                          struct ieee80211_fast_tx *fast_tx,
3093                                          struct sk_buff *skb)
3094 {
3095         struct ieee80211_local *local = sdata->local;
3096         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3097         struct ieee80211_hdr *hdr;
3098         struct ethhdr *amsdu_hdr;
3099         int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3100         int subframe_len = skb->len - hdr_len;
3101         void *data;
3102         u8 *qc, *h_80211_src, *h_80211_dst;
3103         const u8 *bssid;
3104 
3105         if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3106                 return false;
3107 
3108         if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3109                 return true;
3110 
3111         if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr)))
3112                 return false;
3113 
3114         data = skb_push(skb, sizeof(*amsdu_hdr));
3115         memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3116         hdr = data;
3117         amsdu_hdr = data + hdr_len;
3118         /* h_80211_src/dst is addr* field within hdr */
3119         h_80211_src = data + fast_tx->sa_offs;
3120         h_80211_dst = data + fast_tx->da_offs;
3121 
3122         amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3123         ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3124         ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3125 
3126         /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3127          * fields needs to be changed to BSSID for A-MSDU frames depending
3128          * on FromDS/ToDS values.
3129          */
3130         switch (sdata->vif.type) {
3131         case NL80211_IFTYPE_STATION:
3132                 bssid = sdata->u.mgd.bssid;
3133                 break;
3134         case NL80211_IFTYPE_AP:
3135         case NL80211_IFTYPE_AP_VLAN:
3136                 bssid = sdata->vif.addr;
3137                 break;
3138         default:
3139                 bssid = NULL;
3140         }
3141 
3142         if (bssid && ieee80211_has_fromds(hdr->frame_control))
3143                 ether_addr_copy(h_80211_src, bssid);
3144 
3145         if (bssid && ieee80211_has_tods(hdr->frame_control))
3146                 ether_addr_copy(h_80211_dst, bssid);
3147 
3148         qc = ieee80211_get_qos_ctl(hdr);
3149         *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3150 
3151         info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3152 
3153         return true;
3154 }
3155 
3156 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3157                                       struct sta_info *sta,
3158                                       struct ieee80211_fast_tx *fast_tx,
3159                                       struct sk_buff *skb)
3160 {
3161         struct ieee80211_local *local = sdata->local;
3162         struct fq *fq = &local->fq;
3163         struct fq_tin *tin;
3164         struct fq_flow *flow;
3165         u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3166         struct ieee80211_txq *txq = sta->sta.txq[tid];
3167         struct txq_info *txqi;
3168         struct sk_buff **frag_tail, *head;
3169         int subframe_len = skb->len - ETH_ALEN;
3170         u8 max_subframes = sta->sta.max_amsdu_subframes;
3171         int max_frags = local->hw.max_tx_fragments;
3172         int max_amsdu_len = sta->sta.max_amsdu_len;
3173         __be16 len;
3174         void *data;
3175         bool ret = false;
3176         unsigned int orig_len;
3177         int n = 2, nfrags, pad = 0;
3178         u16 hdrlen;
3179 
3180         if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3181                 return false;
3182 
3183         if (!txq)
3184                 return false;
3185 
3186         txqi = to_txq_info(txq);
3187         if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3188                 return false;
3189 
3190         if (sta->sta.max_rc_amsdu_len)
3191                 max_amsdu_len = min_t(int, max_amsdu_len,
3192                                       sta->sta.max_rc_amsdu_len);
3193 
3194         spin_lock_bh(&fq->lock);
3195 
3196         /* TODO: Ideally aggregation should be done on dequeue to remain
3197          * responsive to environment changes.
3198          */
3199 
3200         tin = &txqi->tin;
3201         flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3202         head = skb_peek_tail(&flow->queue);
3203         if (!head)
3204                 goto out;
3205 
3206         orig_len = head->len;
3207 
3208         if (skb->len + head->len > max_amsdu_len)
3209                 goto out;
3210 
3211         nfrags = 1 + skb_shinfo(skb)->nr_frags;
3212         nfrags += 1 + skb_shinfo(head)->nr_frags;
3213         frag_tail = &skb_shinfo(head)->frag_list;
3214         while (*frag_tail) {
3215                 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3216                 frag_tail = &(*frag_tail)->next;
3217                 n++;
3218         }
3219 
3220         if (max_subframes && n > max_subframes)
3221                 goto out;
3222 
3223         if (max_frags && nfrags > max_frags)
3224                 goto out;
3225 
3226         if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3227                 goto out;
3228 
3229         /*
3230          * Pad out the previous subframe to a multiple of 4 by adding the
3231          * padding to the next one, that's being added. Note that head->len
3232          * is the length of the full A-MSDU, but that works since each time
3233          * we add a new subframe we pad out the previous one to a multiple
3234          * of 4 and thus it no longer matters in the next round.
3235          */
3236         hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header);
3237         if ((head->len - hdrlen) & 3)
3238                 pad = 4 - ((head->len - hdrlen) & 3);
3239 
3240         if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) +
3241                                                      2 + pad))
3242                 goto out_recalc;
3243 
3244         ret = true;
3245         data = skb_push(skb, ETH_ALEN + 2);
3246         memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3247 
3248         data += 2 * ETH_ALEN;
3249         len = cpu_to_be16(subframe_len);
3250         memcpy(data, &len, 2);
3251         memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3252 
3253         memset(skb_push(skb, pad), 0, pad);
3254 
3255         head->len += skb->len;
3256         head->data_len += skb->len;
3257         *frag_tail = skb;
3258 
3259 out_recalc:
3260         if (head->len != orig_len) {
3261                 flow->backlog += head->len - orig_len;
3262                 tin->backlog_bytes += head->len - orig_len;
3263 
3264                 fq_recalc_backlog(fq, tin, flow);
3265         }
3266 out:
3267         spin_unlock_bh(&fq->lock);
3268 
3269         return ret;
3270 }
3271 
3272 /*
3273  * Can be called while the sta lock is held. Anything that can cause packets to
3274  * be generated will cause deadlock!
3275  */
3276 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3277                                        struct sta_info *sta, u8 pn_offs,
3278                                        struct ieee80211_key *key,
3279                                        struct sk_buff *skb)
3280 {
3281         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3282         struct ieee80211_hdr *hdr = (void *)skb->data;
3283         u8 tid = IEEE80211_NUM_TIDS;
3284 
3285         if (key)
3286                 info->control.hw_key = &key->conf;
3287 
3288         ieee80211_tx_stats(skb->dev, skb->len);
3289 
3290         if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3291                 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3292                 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3293         } else {
3294                 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3295                 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3296                 sdata->sequence_number += 0x10;
3297         }
3298 
3299         if (skb_shinfo(skb)->gso_size)
3300                 sta->tx_stats.msdu[tid] +=
3301                         DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3302         else
3303                 sta->tx_stats.msdu[tid]++;
3304 
3305         info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3306 
3307         /* statistics normally done by ieee80211_tx_h_stats (but that
3308          * has to consider fragmentation, so is more complex)
3309          */
3310         sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3311         sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3312 
3313         if (pn_offs) {
3314                 u64 pn;
3315                 u8 *crypto_hdr = skb->data + pn_offs;
3316 
3317                 switch (key->conf.cipher) {
3318                 case WLAN_CIPHER_SUITE_CCMP:
3319                 case WLAN_CIPHER_SUITE_CCMP_256:
3320                 case WLAN_CIPHER_SUITE_GCMP:
3321                 case WLAN_CIPHER_SUITE_GCMP_256:
3322                         pn = atomic64_inc_return(&key->conf.tx_pn);
3323                         crypto_hdr[0] = pn;
3324                         crypto_hdr[1] = pn >> 8;
3325                         crypto_hdr[4] = pn >> 16;
3326                         crypto_hdr[5] = pn >> 24;
3327                         crypto_hdr[6] = pn >> 32;
3328                         crypto_hdr[7] = pn >> 40;
3329                         break;
3330                 }
3331         }
3332 }
3333 
3334 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3335                                 struct sta_info *sta,
3336                                 struct ieee80211_fast_tx *fast_tx,
3337                                 struct sk_buff *skb)
3338 {
3339         struct ieee80211_local *local = sdata->local;
3340         u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3341         int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3342         int hw_headroom = sdata->local->hw.extra_tx_headroom;
3343         struct ethhdr eth;
3344         struct ieee80211_tx_info *info;
3345         struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3346         struct ieee80211_tx_data tx;
3347         ieee80211_tx_result r;
3348         struct tid_ampdu_tx *tid_tx = NULL;
3349         u8 tid = IEEE80211_NUM_TIDS;
3350 
3351         /* control port protocol needs a lot of special handling */
3352         if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3353                 return false;
3354 
3355         /* only RFC 1042 SNAP */
3356         if (ethertype < ETH_P_802_3_MIN)
3357                 return false;
3358 
3359         /* don't handle TX status request here either */
3360         if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3361                 return false;
3362 
3363         if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3364                 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3365                 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3366                 if (tid_tx) {
3367                         if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3368                                 return false;
3369                         if (tid_tx->timeout)
3370                                 tid_tx->last_tx = jiffies;
3371                 }
3372         }
3373 
3374         /* after this point (skb is modified) we cannot return false */
3375 
3376         if (skb_shared(skb)) {
3377                 struct sk_buff *tmp_skb = skb;
3378 
3379                 skb = skb_clone(skb, GFP_ATOMIC);
3380                 kfree_skb(tmp_skb);
3381 
3382                 if (!skb)
3383                         return true;
3384         }
3385 
3386         if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3387             ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3388                 return true;
3389 
3390         /* will not be crypto-handled beyond what we do here, so use false
3391          * as the may-encrypt argument for the resize to not account for
3392          * more room than we already have in 'extra_head'
3393          */
3394         if (unlikely(ieee80211_skb_resize(sdata, skb,
3395                                           max_t(int, extra_head + hw_headroom -
3396                                                      skb_headroom(skb), 0),
3397                                           false))) {
3398                 kfree_skb(skb);
3399                 return true;
3400         }
3401 
3402         memcpy(&eth, skb->data, ETH_HLEN - 2);
3403         hdr = skb_push(skb, extra_head);
3404         memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3405         memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3406         memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3407 
3408         info = IEEE80211_SKB_CB(skb);
3409         memset(info, 0, sizeof(*info));
3410         info->band = fast_tx->band;
3411         info->control.vif = &sdata->vif;
3412         info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3413                       IEEE80211_TX_CTL_DONTFRAG |
3414                       (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3415         info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3416 
3417         if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3418                 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3419                 *ieee80211_get_qos_ctl(hdr) = tid;
3420         }
3421 
3422         __skb_queue_head_init(&tx.skbs);
3423 
3424         tx.flags = IEEE80211_TX_UNICAST;
3425         tx.local = local;
3426         tx.sdata = sdata;
3427         tx.sta = sta;
3428         tx.key = fast_tx->key;
3429 
3430         if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3431                 tx.skb = skb;
3432                 r = ieee80211_tx_h_rate_ctrl(&tx);
3433                 skb = tx.skb;
3434                 tx.skb = NULL;
3435 
3436                 if (r != TX_CONTINUE) {
3437                         if (r != TX_QUEUED)
3438                                 kfree_skb(skb);
3439                         return true;
3440                 }
3441         }
3442 
3443         if (ieee80211_queue_skb(local, sdata, sta, skb))
3444                 return true;
3445 
3446         ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3447                                    fast_tx->key, skb);
3448 
3449         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3450                 sdata = container_of(sdata->bss,
3451                                      struct ieee80211_sub_if_data, u.ap);
3452 
3453         __skb_queue_tail(&tx.skbs, skb);
3454         ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3455         return true;
3456 }
3457 
3458 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3459                                      struct ieee80211_txq *txq)
3460 {
3461         struct ieee80211_local *local = hw_to_local(hw);
3462         struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3463         struct ieee80211_hdr *hdr;
3464         struct sk_buff *skb = NULL;
3465         struct fq *fq = &local->fq;
3466         struct fq_tin *tin = &txqi->tin;
3467         struct ieee80211_tx_info *info;
3468         struct ieee80211_tx_data tx;
3469         ieee80211_tx_result r;
3470         struct ieee80211_vif *vif;
3471 
3472         spin_lock_bh(&fq->lock);
3473 
3474         if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
3475                 goto out;
3476 
3477         /* Make sure fragments stay together. */
3478         skb = __skb_dequeue(&txqi->frags);
3479         if (skb)
3480                 goto out;
3481 
3482 begin:
3483         skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3484         if (!skb)
3485                 goto out;
3486 
3487         hdr = (struct ieee80211_hdr *)skb->data;
3488         info = IEEE80211_SKB_CB(skb);
3489 
3490         memset(&tx, 0, sizeof(tx));
3491         __skb_queue_head_init(&tx.skbs);
3492         tx.local = local;
3493         tx.skb = skb;
3494         tx.sdata = vif_to_sdata(info->control.vif);
3495 
3496         if (txq->sta)
3497                 tx.sta = container_of(txq->sta, struct sta_info, sta);
3498 
3499         /*
3500          * The key can be removed while the packet was queued, so need to call
3501          * this here to get the current key.
3502          */
3503         r = ieee80211_tx_h_select_key(&tx);
3504         if (r != TX_CONTINUE) {
3505                 ieee80211_free_txskb(&local->hw, skb);
3506                 goto begin;
3507         }
3508 
3509         if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3510                 info->flags |= IEEE80211_TX_CTL_AMPDU;
3511         else
3512                 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3513 
3514         if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3515                 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3516                                                     sta);
3517                 u8 pn_offs = 0;
3518 
3519                 if (tx.key &&
3520                     (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3521                         pn_offs = ieee80211_hdrlen(hdr->frame_control);
3522 
3523                 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3524                                            tx.key, skb);
3525         } else {
3526                 if (invoke_tx_handlers_late(&tx))
3527                         goto begin;
3528 
3529                 skb = __skb_dequeue(&tx.skbs);
3530 
3531                 if (!skb_queue_empty(&tx.skbs))
3532                         skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3533         }
3534 
3535         if (skb && skb_has_frag_list(skb) &&
3536             !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3537                 if (skb_linearize(skb)) {
3538                         ieee80211_free_txskb(&local->hw, skb);
3539                         goto begin;
3540                 }
3541         }
3542 
3543         switch (tx.sdata->vif.type) {
3544         case NL80211_IFTYPE_MONITOR:
3545                 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
3546                         vif = &tx.sdata->vif;
3547                         break;
3548                 }
3549                 tx.sdata = rcu_dereference(local->monitor_sdata);
3550                 if (tx.sdata) {
3551                         vif = &tx.sdata->vif;
3552                         info->hw_queue =
3553                                 vif->hw_queue[skb_get_queue_mapping(skb)];
3554                 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
3555                         ieee80211_free_txskb(&local->hw, skb);
3556                         goto begin;
3557                 } else {
3558                         vif = NULL;
3559                 }
3560                 break;
3561         case NL80211_IFTYPE_AP_VLAN:
3562                 tx.sdata = container_of(tx.sdata->bss,
3563                                         struct ieee80211_sub_if_data, u.ap);
3564                 /* fall through */
3565         default:
3566                 vif = &tx.sdata->vif;
3567                 break;
3568         }
3569 
3570         IEEE80211_SKB_CB(skb)->control.vif = vif;
3571 out:
3572         spin_unlock_bh(&fq->lock);
3573 
3574         return skb;
3575 }
3576 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3577 
3578 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3579                                   struct net_device *dev,
3580                                   u32 info_flags)
3581 {
3582         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3583         struct sta_info *sta;
3584         struct sk_buff *next;
3585 
3586         if (unlikely(skb->len < ETH_HLEN)) {
3587                 kfree_skb(skb);
3588                 return;
3589         }
3590 
3591         rcu_read_lock();
3592 
3593         if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3594                 goto out_free;
3595 
3596         if (!IS_ERR_OR_NULL(sta)) {
3597                 struct ieee80211_fast_tx *fast_tx;
3598 
3599                 /* We need a bit of data queued to build aggregates properly, so
3600                  * instruct the TCP stack to allow more than a single ms of data
3601                  * to be queued in the stack. The value is a bit-shift of 1
3602                  * second, so 8 is ~4ms of queued data. Only affects local TCP
3603                  * sockets.
3604                  */
3605                 sk_pacing_shift_update(skb->sk, 8);
3606 
3607                 fast_tx = rcu_dereference(sta->fast_tx);
3608 
3609                 if (fast_tx &&
3610                     ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
3611                         goto out;
3612         }
3613 
3614         if (skb_is_gso(skb)) {
3615                 struct sk_buff *segs;
3616 
3617                 segs = skb_gso_segment(skb, 0);
3618                 if (IS_ERR(segs)) {
3619                         goto out_free;
3620                 } else if (segs) {
3621                         consume_skb(skb);
3622                         skb = segs;
3623                 }
3624         } else {
3625                 /* we cannot process non-linear frames on this path */
3626                 if (skb_linearize(skb)) {
3627                         kfree_skb(skb);
3628                         goto out;
3629                 }
3630 
3631                 /* the frame could be fragmented, software-encrypted, and other
3632                  * things so we cannot really handle checksum offload with it -
3633                  * fix it up in software before we handle anything else.
3634                  */
3635                 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3636                         skb_set_transport_header(skb,
3637                                                  skb_checksum_start_offset(skb));
3638                         if (skb_checksum_help(skb))
3639                                 goto out_free;
3640                 }
3641         }
3642 
3643         next = skb;
3644         while (next) {
3645                 skb = next;
3646                 next = skb->next;
3647 
3648                 skb->prev = NULL;
3649                 skb->next = NULL;
3650 
3651                 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3652                 if (IS_ERR(skb))
3653                         goto out;
3654 
3655                 ieee80211_tx_stats(dev, skb->len);
3656 
3657                 ieee80211_xmit(sdata, sta, skb);
3658         }
3659         goto out;
3660  out_free:
3661         kfree_skb(skb);
3662  out:
3663         rcu_read_unlock();
3664 }
3665 
3666 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
3667 {
3668         struct ethhdr *eth;
3669         int err;
3670 
3671         err = skb_ensure_writable(skb, ETH_HLEN);
3672         if (unlikely(err))
3673                 return err;
3674 
3675         eth = (void *)skb->data;
3676         ether_addr_copy(eth->h_dest, sta->sta.addr);
3677 
3678         return 0;
3679 }
3680 
3681 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
3682                                            struct net_device *dev)
3683 {
3684         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3685         const struct ethhdr *eth = (void *)skb->data;
3686         const struct vlan_ethhdr *ethvlan = (void *)skb->data;
3687         __be16 ethertype;
3688 
3689         if (likely(!is_multicast_ether_addr(eth->h_dest)))
3690                 return false;
3691 
3692         switch (sdata->vif.type) {
3693         case NL80211_IFTYPE_AP_VLAN:
3694                 if (sdata->u.vlan.sta)
3695                         return false;
3696                 if (sdata->wdev.use_4addr)
3697                         return false;
3698                 /* fall through */
3699         case NL80211_IFTYPE_AP:
3700                 /* check runtime toggle for this bss */
3701                 if (!sdata->bss->multicast_to_unicast)
3702                         return false;
3703                 break;
3704         default:
3705                 return false;
3706         }
3707 
3708         /* multicast to unicast conversion only for some payload */
3709         ethertype = eth->h_proto;
3710         if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
3711                 ethertype = ethvlan->h_vlan_encapsulated_proto;
3712         switch (ethertype) {
3713         case htons(ETH_P_ARP):
3714         case htons(ETH_P_IP):
3715         case htons(ETH_P_IPV6):
3716                 break;
3717         default:
3718                 return false;
3719         }
3720 
3721         return true;
3722 }
3723 
3724 static void
3725 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
3726                              struct sk_buff_head *queue)
3727 {
3728         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3729         struct ieee80211_local *local = sdata->local;
3730         const struct ethhdr *eth = (struct ethhdr *)skb->data;
3731         struct sta_info *sta, *first = NULL;
3732         struct sk_buff *cloned_skb;
3733 
3734         rcu_read_lock();
3735 
3736         list_for_each_entry_rcu(sta, &local->sta_list, list) {
3737                 if (sdata != sta->sdata)
3738                         /* AP-VLAN mismatch */
3739                         continue;
3740                 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
3741                         /* do not send back to source */
3742                         continue;
3743                 if (!first) {
3744                         first = sta;
3745                         continue;
3746                 }
3747                 cloned_skb = skb_clone(skb, GFP_ATOMIC);
3748                 if (!cloned_skb)
3749                         goto multicast;
3750                 if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
3751                         dev_kfree_skb(cloned_skb);
3752                         goto multicast;
3753                 }
3754                 __skb_queue_tail(queue, cloned_skb);
3755         }
3756 
3757         if (likely(first)) {
3758                 if (unlikely(ieee80211_change_da(skb, first)))
3759                         goto multicast;
3760                 __skb_queue_tail(queue, skb);
3761         } else {
3762                 /* no STA connected, drop */
3763                 kfree_skb(skb);
3764                 skb = NULL;
3765         }
3766 
3767         goto out;
3768 multicast:
3769         __skb_queue_purge(queue);
3770         __skb_queue_tail(queue, skb);
3771 out:
3772         rcu_read_unlock();
3773 }
3774 
3775 /**
3776  * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3777  * @skb: packet to be sent
3778  * @dev: incoming interface
3779  *
3780  * On failure skb will be freed.
3781  */
3782 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3783                                        struct net_device *dev)
3784 {
3785         if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
3786                 struct sk_buff_head queue;
3787 
3788                 __skb_queue_head_init(&queue);
3789                 ieee80211_convert_to_unicast(skb, dev, &queue);
3790                 while ((skb = __skb_dequeue(&queue)))
3791                         __ieee80211_subif_start_xmit(skb, dev, 0);
3792         } else {
3793                 __ieee80211_subif_start_xmit(skb, dev, 0);
3794         }
3795 
3796         return NETDEV_TX_OK;
3797 }
3798 
3799 struct sk_buff *
3800 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3801                               struct sk_buff *skb, u32 info_flags)
3802 {
3803         struct ieee80211_hdr *hdr;
3804         struct ieee80211_tx_data tx = {
3805                 .local = sdata->local,
3806                 .sdata = sdata,
3807         };
3808         struct sta_info *sta;
3809 
3810         rcu_read_lock();
3811 
3812         if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3813                 kfree_skb(skb);
3814                 skb = ERR_PTR(-EINVAL);
3815                 goto out;
3816         }
3817 
3818         skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3819         if (IS_ERR(skb))
3820                 goto out;
3821 
3822         hdr = (void *)skb->data;
3823         tx.sta = sta_info_get(sdata, hdr->addr1);
3824         tx.skb = skb;
3825 
3826         if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3827                 rcu_read_unlock();
3828                 kfree_skb(skb);
3829                 return ERR_PTR(-EINVAL);
3830         }
3831 
3832 out:
3833         rcu_read_unlock();
3834         return skb;
3835 }
3836 
3837 /*
3838  * ieee80211_clear_tx_pending may not be called in a context where
3839  * it is possible that it packets could come in again.
3840  */
3841 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3842 {
3843         struct sk_buff *skb;
3844         int i;
3845 
3846         for (i = 0; i < local->hw.queues; i++) {
3847                 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3848                         ieee80211_free_txskb(&local->hw, skb);
3849         }
3850 }
3851 
3852 /*
3853  * Returns false if the frame couldn't be transmitted but was queued instead,
3854  * which in this case means re-queued -- take as an indication to stop sending
3855  * more pending frames.
3856  */
3857 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3858                                      struct sk_buff *skb)
3859 {
3860         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3861         struct ieee80211_sub_if_data *sdata;
3862         struct sta_info *sta;
3863         struct ieee80211_hdr *hdr;
3864         bool result;
3865         struct ieee80211_chanctx_conf *chanctx_conf;
3866 
3867         sdata = vif_to_sdata(info->control.vif);
3868 
3869         if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3870                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3871                 if (unlikely(!chanctx_conf)) {
3872                         dev_kfree_skb(skb);
3873                         return true;
3874                 }
3875                 info->band = chanctx_conf->def.chan->band;
3876                 result = ieee80211_tx(sdata, NULL, skb, true);
3877         } else {
3878                 struct sk_buff_head skbs;
3879 
3880                 __skb_queue_head_init(&skbs);
3881                 __skb_queue_tail(&skbs, skb);
3882 
3883                 hdr = (struct ieee80211_hdr *)skb->data;
3884                 sta = sta_info_get(sdata, hdr->addr1);
3885 
3886                 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3887         }
3888 
3889         return result;
3890 }
3891 
3892 /*
3893  * Transmit all pending packets. Called from tasklet.
3894  */
3895 void ieee80211_tx_pending(unsigned long data)
3896 {
3897         struct ieee80211_local *local = (struct ieee80211_local *)data;
3898         unsigned long flags;
3899         int i;
3900         bool txok;
3901 
3902         rcu_read_lock();
3903 
3904         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3905         for (i = 0; i < local->hw.queues; i++) {
3906                 /*
3907                  * If queue is stopped by something other than due to pending
3908                  * frames, or we have no pending frames, proceed to next queue.
3909                  */
3910                 if (local->queue_stop_reasons[i] ||
3911                     skb_queue_empty(&local->pending[i]))
3912                         continue;
3913 
3914                 while (!skb_queue_empty(&local->pending[i])) {
3915                         struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3916                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3917 
3918                         if (WARN_ON(!info->control.vif)) {
3919                                 ieee80211_free_txskb(&local->hw, skb);
3920                                 continue;
3921                         }
3922 
3923                         spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3924                                                 flags);
3925 
3926                         txok = ieee80211_tx_pending_skb(local, skb);
3927                         spin_lock_irqsave(&local->queue_stop_reason_lock,
3928                                           flags);
3929                         if (!txok)
3930                                 break;
3931                 }
3932 
3933                 if (skb_queue_empty(&local->pending[i]))
3934                         ieee80211_propagate_queue_wake(local, i);
3935         }
3936         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3937 
3938         rcu_read_unlock();
3939 }
3940 
3941 /* functions for drivers to get certain frames */
3942 
3943 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3944                                        struct ps_data *ps, struct sk_buff *skb,
3945                                        bool is_template)
3946 {
3947         u8 *pos, *tim;
3948         int aid0 = 0;
3949         int i, have_bits = 0, n1, n2;
3950 
3951         /* Generate bitmap for TIM only if there are any STAs in power save
3952          * mode. */
3953         if (atomic_read(&ps->num_sta_ps) > 0)
3954                 /* in the hope that this is faster than
3955                  * checking byte-for-byte */
3956                 have_bits = !bitmap_empty((unsigned long *)ps->tim,
3957                                           IEEE80211_MAX_AID+1);
3958         if (!is_template) {
3959                 if (ps->dtim_count == 0)
3960                         ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3961                 else
3962                         ps->dtim_count--;
3963         }
3964 
3965         tim = pos = skb_put(skb, 6);
3966         *pos++ = WLAN_EID_TIM;
3967         *pos++ = 4;
3968         *pos++ = ps->dtim_count;
3969         *pos++ = sdata->vif.bss_conf.dtim_period;
3970 
3971         if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3972                 aid0 = 1;
3973 
3974         ps->dtim_bc_mc = aid0 == 1;
3975 
3976         if (have_bits) {
3977                 /* Find largest even number N1 so that bits numbered 1 through
3978                  * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3979                  * (N2 + 1) x 8 through 2007 are 0. */
3980                 n1 = 0;
3981                 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
3982                         if (ps->tim[i]) {
3983                                 n1 = i & 0xfe;
3984                                 break;
3985                         }
3986                 }
3987                 n2 = n1;
3988                 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3989                         if (ps->tim[i]) {
3990                                 n2 = i;
3991                                 break;
3992                         }
3993                 }
3994 
3995                 /* Bitmap control */
3996                 *pos++ = n1 | aid0;
3997                 /* Part Virt Bitmap */
3998                 skb_put(skb, n2 - n1);
3999                 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
4000 
4001                 tim[1] = n2 - n1 + 4;
4002         } else {
4003                 *pos++ = aid0; /* Bitmap control */
4004                 *pos++ = 0; /* Part Virt Bitmap */
4005         }
4006 }
4007 
4008 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4009                                     struct ps_data *ps, struct sk_buff *skb,
4010                                     bool is_template)
4011 {
4012         struct ieee80211_local *local = sdata->local;
4013 
4014         /*
4015          * Not very nice, but we want to allow the driver to call
4016          * ieee80211_beacon_get() as a response to the set_tim()
4017          * callback. That, however, is already invoked under the
4018          * sta_lock to guarantee consistent and race-free update
4019          * of the tim bitmap in mac80211 and the driver.
4020          */
4021         if (local->tim_in_locked_section) {
4022                 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4023         } else {
4024                 spin_lock_bh(&local->tim_lock);
4025                 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4026                 spin_unlock_bh(&local->tim_lock);
4027         }
4028 
4029         return 0;
4030 }
4031 
4032 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
4033                               struct beacon_data *beacon)
4034 {
4035         struct probe_resp *resp;
4036         u8 *beacon_data;
4037         size_t beacon_data_len;
4038         int i;
4039         u8 count = beacon->csa_current_counter;
4040 
4041         switch (sdata->vif.type) {
4042         case NL80211_IFTYPE_AP:
4043                 beacon_data = beacon->tail;
4044                 beacon_data_len = beacon->tail_len;
4045                 break;
4046         case NL80211_IFTYPE_ADHOC:
4047                 beacon_data = beacon->head;
4048                 beacon_data_len = beacon->head_len;
4049                 break;
4050         case NL80211_IFTYPE_MESH_POINT:
4051                 beacon_data = beacon->head;
4052                 beacon_data_len = beacon->head_len;
4053                 break;
4054         default:
4055                 return;
4056         }
4057 
4058         rcu_read_lock();
4059         for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
4060                 resp = rcu_dereference(sdata->u.ap.probe_resp);
4061 
4062                 if (beacon->csa_counter_offsets[i]) {
4063                         if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
4064                                          beacon_data_len)) {
4065                                 rcu_read_unlock();
4066                                 return;
4067                         }
4068 
4069                         beacon_data[beacon->csa_counter_offsets[i]] = count;
4070                 }
4071 
4072                 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
4073                         resp->data[resp->csa_counter_offsets[i]] = count;
4074         }
4075         rcu_read_unlock();
4076 }
4077 
4078 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
4079 {
4080         beacon->csa_current_counter--;
4081 
4082         /* the counter should never reach 0 */
4083         WARN_ON_ONCE(!beacon->csa_current_counter);
4084 
4085         return beacon->csa_current_counter;
4086 }
4087 
4088 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
4089 {
4090         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4091         struct beacon_data *beacon = NULL;
4092         u8 count = 0;
4093 
4094         rcu_read_lock();
4095 
4096         if (sdata->vif.type == NL80211_IFTYPE_AP)
4097                 beacon = rcu_dereference(sdata->u.ap.beacon);
4098         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4099                 beacon = rcu_dereference(sdata->u.ibss.presp);
4100         else if (ieee80211_vif_is_mesh(&sdata->vif))
4101                 beacon = rcu_dereference(sdata->u.mesh.beacon);
4102 
4103         if (!beacon)
4104                 goto unlock;
4105 
4106         count = __ieee80211_csa_update_counter(beacon);
4107 
4108 unlock:
4109         rcu_read_unlock();
4110         return count;
4111 }
4112 EXPORT_SYMBOL(ieee80211_csa_update_counter);
4113 
4114 void ieee80211_csa_set_counter(struct ieee80211_vif *vif, u8 counter)
4115 {
4116         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4117         struct beacon_data *beacon = NULL;
4118 
4119         rcu_read_lock();
4120 
4121         if (sdata->vif.type == NL80211_IFTYPE_AP)
4122                 beacon = rcu_dereference(sdata->u.ap.beacon);
4123         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4124                 beacon = rcu_dereference(sdata->u.ibss.presp);
4125         else if (ieee80211_vif_is_mesh(&sdata->vif))
4126                 beacon = rcu_dereference(sdata->u.mesh.beacon);
4127 
4128         if (!beacon)
4129                 goto unlock;
4130 
4131         if (counter < beacon->csa_current_counter)
4132                 beacon->csa_current_counter = counter;
4133 
4134 unlock:
4135         rcu_read_unlock();
4136 }
4137 EXPORT_SYMBOL(ieee80211_csa_set_counter);
4138 
4139 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
4140 {
4141         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4142         struct beacon_data *beacon = NULL;
4143         u8 *beacon_data;
4144         size_t beacon_data_len;
4145         int ret = false;
4146 
4147         if (!ieee80211_sdata_running(sdata))
4148                 return false;
4149 
4150         rcu_read_lock();
4151         if (vif->type == NL80211_IFTYPE_AP) {
4152                 struct ieee80211_if_ap *ap = &sdata->u.ap;
4153 
4154                 beacon = rcu_dereference(ap->beacon);
4155                 if (WARN_ON(!beacon || !beacon->tail))
4156                         goto out;
4157                 beacon_data = beacon->tail;
4158                 beacon_data_len = beacon->tail_len;
4159         } else if (vif->type == NL80211_IFTYPE_ADHOC) {
4160                 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4161 
4162                 beacon = rcu_dereference(ifibss->presp);
4163                 if (!beacon)
4164                         goto out;
4165 
4166                 beacon_data = beacon->head;
4167                 beacon_data_len = beacon->head_len;
4168         } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
4169                 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4170 
4171                 beacon = rcu_dereference(ifmsh->beacon);
4172                 if (!beacon)
4173                         goto out;
4174 
4175                 beacon_data = beacon->head;
4176                 beacon_data_len = beacon->head_len;
4177         } else {
4178                 WARN_ON(1);
4179                 goto out;
4180         }
4181 
4182         if (!beacon->csa_counter_offsets[0])
4183                 goto out;
4184 
4185         if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
4186                 goto out;
4187 
4188         if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
4189                 ret = true;
4190  out:
4191         rcu_read_unlock();
4192 
4193         return ret;
4194 }
4195 EXPORT_SYMBOL(ieee80211_csa_is_complete);
4196 
4197 static struct sk_buff *
4198 __ieee80211_beacon_get(struct ieee80211_hw *hw,
4199                        struct ieee80211_vif *vif,
4200                        struct ieee80211_mutable_offsets *offs,
4201                        bool is_template)
4202 {
4203         struct ieee80211_local *local = hw_to_local(hw);
4204         struct beacon_data *beacon = NULL;
4205         struct sk_buff *skb = NULL;
4206         struct ieee80211_tx_info *info;
4207         struct ieee80211_sub_if_data *sdata = NULL;
4208         enum nl80211_band band;
4209         struct ieee80211_tx_rate_control txrc;
4210         struct ieee80211_chanctx_conf *chanctx_conf;
4211         int csa_off_base = 0;
4212 
4213         rcu_read_lock();
4214 
4215         sdata = vif_to_sdata(vif);
4216         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4217 
4218         if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
4219                 goto out;
4220 
4221         if (offs)
4222                 memset(offs, 0, sizeof(*offs));
4223 
4224         if (sdata->vif.type == NL80211_IFTYPE_AP) {
4225                 struct ieee80211_if_ap *ap = &sdata->u.ap;
4226 
4227                 beacon = rcu_dereference(ap->beacon);
4228                 if (beacon) {
4229                         if (beacon->csa_counter_offsets[0]) {
4230                                 if (!is_template)
4231                                         __ieee80211_csa_update_counter(beacon);
4232 
4233                                 ieee80211_set_csa(sdata, beacon);
4234                         }
4235 
4236                         /*
4237                          * headroom, head length,
4238                          * tail length and maximum TIM length
4239                          */
4240                         skb = dev_alloc_skb(local->tx_headroom +
4241                                             beacon->head_len +
4242                                             beacon->tail_len + 256 +
4243                                             local->hw.extra_beacon_tailroom);
4244                         if (!skb)
4245                                 goto out;
4246 
4247                         skb_reserve(skb, local->tx_headroom);
4248                         skb_put_data(skb, beacon->head, beacon->head_len);
4249 
4250                         ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4251                                                  is_template);
4252 
4253                         if (offs) {
4254                                 offs->tim_offset = beacon->head_len;
4255                                 offs->tim_length = skb->len - beacon->head_len;
4256 
4257                                 /* for AP the csa offsets are from tail */
4258                                 csa_off_base = skb->len;
4259                         }
4260 
4261                         if (beacon->tail)
4262                                 skb_put_data(skb, beacon->tail,
4263                                              beacon->tail_len);
4264                 } else
4265                         goto out;
4266         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
4267                 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4268                 struct ieee80211_hdr *hdr;
4269 
4270                 beacon = rcu_dereference(ifibss->presp);
4271                 if (!beacon)
4272                         goto out;
4273 
4274                 if (beacon->csa_counter_offsets[0]) {
4275                         if (!is_template)
4276                                 __ieee80211_csa_update_counter(beacon);
4277 
4278                         ieee80211_set_csa(sdata, beacon);
4279                 }
4280 
4281                 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
4282                                     local->hw.extra_beacon_tailroom);
4283                 if (!skb)
4284                         goto out;
4285                 skb_reserve(skb, local->tx_headroom);
4286                 skb_put_data(skb, beacon->head, beacon->head_len);
4287 
4288                 hdr = (struct ieee80211_hdr *) skb->data;
4289                 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4290                                                  IEEE80211_STYPE_BEACON);
4291         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4292                 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4293 
4294                 beacon = rcu_dereference(ifmsh->beacon);
4295                 if (!beacon)
4296                         goto out;
4297 
4298                 if (beacon->csa_counter_offsets[0]) {
4299                         if (!is_template)
4300                                 /* TODO: For mesh csa_counter is in TU, so
4301                                  * decrementing it by one isn't correct, but
4302                                  * for now we leave it consistent with overall
4303                                  * mac80211's behavior.
4304                                  */
4305                                 __ieee80211_csa_update_counter(beacon);
4306 
4307                         ieee80211_set_csa(sdata, beacon);
4308                 }
4309 
4310                 if (ifmsh->sync_ops)
4311                         ifmsh->sync_ops->adjust_tsf(sdata, beacon);
4312 
4313                 skb = dev_alloc_skb(local->tx_headroom +
4314                                     beacon->head_len +
4315                                     256 + /* TIM IE */
4316                                     beacon->tail_len +
4317                                     local->hw.extra_beacon_tailroom);
4318                 if (!skb)
4319                         goto out;
4320                 skb_reserve(skb, local->tx_headroom);
4321                 skb_put_data(skb, beacon->head, beacon->head_len);
4322                 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4323 
4324                 if (offs) {
4325                         offs->tim_offset = beacon->head_len;
4326                         offs->tim_length = skb->len - beacon->head_len;
4327                 }
4328 
4329                 skb_put_data(skb, beacon->tail, beacon->tail_len);
4330         } else {
4331                 WARN_ON(1);
4332                 goto out;
4333         }
4334 
4335         /* CSA offsets */
4336         if (offs && beacon) {
4337                 int i;
4338 
4339                 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
4340                         u16 csa_off = beacon->csa_counter_offsets[i];
4341 
4342                         if (!csa_off)
4343                                 continue;
4344 
4345                         offs->csa_counter_offs[i] = csa_off_base + csa_off;
4346                 }
4347         }
4348 
4349         band = chanctx_conf->def.chan->band;
4350 
4351         info = IEEE80211_SKB_CB(skb);
4352 
4353         info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4354         info->flags |= IEEE80211_TX_CTL_NO_ACK;
4355         info->band = band;
4356 
4357         memset(&txrc, 0, sizeof(txrc));
4358         txrc.hw = hw;
4359         txrc.sband = local->hw.wiphy->bands[band];
4360         txrc.bss_conf = &sdata->vif.bss_conf;
4361         txrc.skb = skb;
4362         txrc.reported_rate.idx = -1;
4363         txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
4364         txrc.bss = true;
4365         rate_control_get_rate(sdata, NULL, &txrc);
4366 
4367         info->control.vif = vif;
4368 
4369         info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4370                         IEEE80211_TX_CTL_ASSIGN_SEQ |
4371                         IEEE80211_TX_CTL_FIRST_FRAGMENT;
4372  out:
4373         rcu_read_unlock();
4374         return skb;
4375 
4376 }
4377 
4378 struct sk_buff *
4379 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4380                               struct ieee80211_vif *vif,
4381                               struct ieee80211_mutable_offsets *offs)
4382 {
4383         return __ieee80211_beacon_get(hw, vif, offs, true);
4384 }
4385 EXPORT_SYMBOL(ieee80211_beacon_get_template);
4386 
4387 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4388                                          struct ieee80211_vif *vif,
4389                                          u16 *tim_offset, u16 *tim_length)
4390 {
4391         struct ieee80211_mutable_offsets offs = {};
4392         struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
4393         struct sk_buff *copy;
4394         struct ieee80211_supported_band *sband;
4395         int shift;
4396 
4397         if (!bcn)
4398                 return bcn;
4399 
4400         if (tim_offset)
4401                 *tim_offset = offs.tim_offset;
4402 
4403         if (tim_length)
4404                 *tim_length = offs.tim_length;
4405 
4406         if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4407             !hw_to_local(hw)->monitors)
4408                 return bcn;
4409 
4410         /* send a copy to monitor interfaces */
4411         copy = skb_copy(bcn, GFP_ATOMIC);
4412         if (!copy)
4413                 return bcn;
4414 
4415         shift = ieee80211_vif_get_shift(vif);
4416         sband = ieee80211_get_sband(vif_to_sdata(vif));
4417         if (!sband)
4418                 return bcn;
4419 
4420         ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4421 
4422         return bcn;
4423 }
4424 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4425 
4426 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4427                                         struct ieee80211_vif *vif)
4428 {
4429         struct ieee80211_if_ap *ap = NULL;
4430         struct sk_buff *skb = NULL;
4431         struct probe_resp *presp = NULL;
4432         struct ieee80211_hdr *hdr;
4433         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4434 
4435         if (sdata->vif.type != NL80211_IFTYPE_AP)
4436                 return NULL;
4437 
4438         rcu_read_lock();
4439 
4440         ap = &sdata->u.ap;
4441         presp = rcu_dereference(ap->probe_resp);
4442         if (!presp)
4443                 goto out;
4444 
4445         skb = dev_alloc_skb(presp->len);
4446         if (!skb)
4447                 goto out;
4448 
4449         skb_put_data(skb, presp->data, presp->len);
4450 
4451         hdr = (struct ieee80211_hdr *) skb->data;
4452         memset(hdr->addr1, 0, sizeof(hdr->addr1));
4453 
4454 out:
4455         rcu_read_unlock();
4456         return skb;
4457 }
4458 EXPORT_SYMBOL(ieee80211_proberesp_get);
4459 
4460 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4461                                      struct ieee80211_vif *vif)
4462 {
4463         struct ieee80211_sub_if_data *sdata;
4464         struct ieee80211_if_managed *ifmgd;
4465         struct ieee80211_pspoll *pspoll;
4466         struct ieee80211_local *local;
4467         struct sk_buff *skb;
4468 
4469         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4470                 return NULL;
4471 
4472         sdata = vif_to_sdata(vif);
4473         ifmgd = &sdata->u.mgd;
4474         local = sdata->local;
4475 
4476         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4477         if (!skb)
4478                 return NULL;
4479 
4480         skb_reserve(skb, local->hw.extra_tx_headroom);
4481 
4482         pspoll = skb_put_zero(skb, sizeof(*pspoll));
4483         pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4484                                             IEEE80211_STYPE_PSPOLL);
4485         pspoll->aid = cpu_to_le16(ifmgd->aid);
4486 
4487         /* aid in PS-Poll has its two MSBs each set to 1 */
4488         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4489 
4490         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4491         memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4492 
4493         return skb;
4494 }
4495 EXPORT_SYMBOL(ieee80211_pspoll_get);
4496 
4497 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4498                                        struct ieee80211_vif *vif,
4499                                        bool qos_ok)
4500 {
4501         struct ieee80211_hdr_3addr *nullfunc;
4502         struct ieee80211_sub_if_data *sdata;
4503         struct ieee80211_if_managed *ifmgd;
4504         struct ieee80211_local *local;
4505         struct sk_buff *skb;
4506         bool qos = false;
4507 
4508         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4509                 return NULL;
4510 
4511         sdata = vif_to_sdata(vif);
4512         ifmgd = &sdata->u.mgd;
4513         local = sdata->local;
4514 
4515         if (qos_ok) {
4516                 struct sta_info *sta;
4517 
4518                 rcu_read_lock();
4519                 sta = sta_info_get(sdata, ifmgd->bssid);
4520                 qos = sta && sta->sta.wme;
4521                 rcu_read_unlock();
4522         }
4523 
4524         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
4525                             sizeof(*nullfunc) + 2);
4526         if (!skb)
4527                 return NULL;
4528 
4529         skb_reserve(skb, local->hw.extra_tx_headroom);
4530 
4531         nullfunc = skb_put_zero(skb, sizeof(*nullfunc));
4532         nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4533                                               IEEE80211_STYPE_NULLFUNC |
4534                                               IEEE80211_FCTL_TODS);
4535         if (qos) {
4536                 __le16 qos = cpu_to_le16(7);
4537 
4538                 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC |
4539                               IEEE80211_STYPE_NULLFUNC) !=
4540                              IEEE80211_STYPE_QOS_NULLFUNC);
4541                 nullfunc->frame_control |=
4542                         cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC);
4543                 skb->priority = 7;
4544                 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
4545                 skb_put_data(skb, &qos, sizeof(qos));
4546         }
4547 
4548         memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4549         memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4550         memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4551 
4552         return skb;
4553 }
4554 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4555 
4556 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4557                                        const u8 *src_addr,
4558                                        const u8 *ssid, size_t ssid_len,
4559                                        size_t tailroom)
4560 {
4561         struct ieee80211_local *local = hw_to_local(hw);
4562         struct ieee80211_hdr_3addr *hdr;
4563         struct sk_buff *skb;
4564         size_t ie_ssid_len;
4565         u8 *pos;
4566 
4567         ie_ssid_len = 2 + ssid_len;
4568 
4569         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4570                             ie_ssid_len + tailroom);
4571         if (!skb)
4572                 return NULL;
4573 
4574         skb_reserve(skb, local->hw.extra_tx_headroom);
4575 
4576         hdr = skb_put_zero(skb, sizeof(*hdr));
4577         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4578                                          IEEE80211_STYPE_PROBE_REQ);
4579         eth_broadcast_addr(hdr->addr1);
4580         memcpy(hdr->addr2, src_addr, ETH_ALEN);
4581         eth_broadcast_addr(hdr->addr3);
4582 
4583         pos = skb_put(skb, ie_ssid_len);
4584         *pos++ = WLAN_EID_SSID;
4585         *pos++ = ssid_len;
4586         if (ssid_len)
4587                 memcpy(pos, ssid, ssid_len);
4588         pos += ssid_len;
4589 
4590         return skb;
4591 }
4592 EXPORT_SYMBOL(ieee80211_probereq_get);
4593 
4594 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4595                        const void *frame, size_t frame_len,
4596                        const struct ieee80211_tx_info *frame_txctl,
4597                        struct ieee80211_rts *rts)
4598 {
4599         const struct ieee80211_hdr *hdr = frame;
4600 
4601         rts->frame_control =
4602             cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4603         rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4604                                                frame_txctl);
4605         memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4606         memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4607 }
4608 EXPORT_SYMBOL(ieee80211_rts_get);
4609 
4610 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4611                              const void *frame, size_t frame_len,
4612                              const struct ieee80211_tx_info *frame_txctl,
4613                              struct ieee80211_cts *cts)
4614 {
4615         const struct ieee80211_hdr *hdr = frame;
4616 
4617         cts->frame_control =
4618             cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4619         cts->duration = ieee80211_ctstoself_duration(hw, vif,
4620                                                      frame_len, frame_txctl);
4621         memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4622 }
4623 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4624 
4625 struct sk_buff *
4626 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4627                           struct ieee80211_vif *vif)
4628 {
4629         struct ieee80211_local *local = hw_to_local(hw);
4630         struct sk_buff *skb = NULL;
4631         struct ieee80211_tx_data tx;
4632         struct ieee80211_sub_if_data *sdata;
4633         struct ps_data *ps;
4634         struct ieee80211_tx_info *info;
4635         struct ieee80211_chanctx_conf *chanctx_conf;
4636 
4637         sdata = vif_to_sdata(vif);
4638 
4639         rcu_read_lock();
4640         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4641 
4642         if (!chanctx_conf)
4643                 goto out;
4644 
4645         if (sdata->vif.type == NL80211_IFTYPE_AP) {
4646                 struct beacon_data *beacon =
4647                                 rcu_dereference(sdata->u.ap.beacon);
4648 
4649                 if (!beacon || !beacon->head)
4650                         goto out;
4651 
4652                 ps = &sdata->u.ap.ps;
4653         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4654                 ps = &sdata->u.mesh.ps;
4655         } else {
4656                 goto out;
4657         }
4658 
4659         if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4660                 goto out; /* send buffered bc/mc only after DTIM beacon */
4661 
4662         while (1) {
4663                 skb = skb_dequeue(&ps->bc_buf);
4664                 if (!skb)
4665                         goto out;
4666                 local->total_ps_buffered--;
4667 
4668                 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4669                         struct ieee80211_hdr *hdr =
4670                                 (struct ieee80211_hdr *) skb->data;
4671                         /* more buffered multicast/broadcast frames ==> set
4672                          * MoreData flag in IEEE 802.11 header to inform PS
4673                          * STAs */
4674                         hdr->frame_control |=
4675                                 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4676                 }
4677 
4678                 if (sdata->vif.type == NL80211_IFTYPE_AP)
4679                         sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4680                 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4681                         break;
4682                 ieee80211_free_txskb(hw, skb);
4683         }
4684 
4685         info = IEEE80211_SKB_CB(skb);
4686 
4687         tx.flags |= IEEE80211_TX_PS_BUFFERED;
4688         info->band = chanctx_conf->def.chan->band;
4689 
4690         if (invoke_tx_handlers(&tx))
4691                 skb = NULL;
4692  out:
4693         rcu_read_unlock();
4694 
4695         return skb;
4696 }
4697 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4698 
4699 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4700 {
4701         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4702         struct ieee80211_sub_if_data *sdata = sta->sdata;
4703         struct ieee80211_local *local = sdata->local;
4704         int ret;
4705         u32 queues;
4706 
4707         lockdep_assert_held(&local->sta_mtx);
4708 
4709         /* only some cases are supported right now */
4710         switch (sdata->vif.type) {
4711         case NL80211_IFTYPE_STATION:
4712         case NL80211_IFTYPE_AP:
4713         case NL80211_IFTYPE_AP_VLAN:
4714                 break;
4715         default:
4716                 WARN_ON(1);
4717                 return -EINVAL;
4718         }
4719 
4720         if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4721                 return -EINVAL;
4722 
4723         if (sta->reserved_tid == tid) {
4724                 ret = 0;
4725                 goto out;
4726         }
4727 
4728         if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4729                 sdata_err(sdata, "TID reservation already active\n");
4730                 ret = -EALREADY;
4731                 goto out;
4732         }
4733 
4734         ieee80211_stop_vif_queues(sdata->local, sdata,
4735                                   IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4736 
4737         synchronize_net();
4738 
4739         /* Tear down BA sessions so we stop aggregating on this TID */
4740         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4741                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4742                 __ieee80211_stop_tx_ba_session(sta, tid,
4743                                                AGG_STOP_LOCAL_REQUEST);
4744         }
4745 
4746         queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4747         __ieee80211_flush_queues(local, sdata, queues, false);
4748 
4749         sta->reserved_tid = tid;
4750 
4751         ieee80211_wake_vif_queues(local, sdata,
4752                                   IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4753 
4754         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4755                 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4756 
4757         ret = 0;
4758  out:
4759         return ret;
4760 }
4761 EXPORT_SYMBOL(ieee80211_reserve_tid);
4762 
4763 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4764 {
4765         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4766         struct ieee80211_sub_if_data *sdata = sta->sdata;
4767 
4768         lockdep_assert_held(&sdata->local->sta_mtx);
4769 
4770         /* only some cases are supported right now */
4771         switch (sdata->vif.type) {
4772         case NL80211_IFTYPE_STATION:
4773         case NL80211_IFTYPE_AP:
4774         case NL80211_IFTYPE_AP_VLAN:
4775                 break;
4776         default:
4777                 WARN_ON(1);
4778                 return;
4779         }
4780 
4781         if (tid != sta->reserved_tid) {
4782                 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4783                 return;
4784         }
4785 
4786         sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4787 }
4788 EXPORT_SYMBOL(ieee80211_unreserve_tid);
4789 
4790 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4791                                  struct sk_buff *skb, int tid,
4792                                  enum nl80211_band band)
4793 {
4794         int ac = ieee80211_ac_from_tid(tid);
4795 
4796         skb_reset_mac_header(skb);
4797         skb_set_queue_mapping(skb, ac);
4798         skb->priority = tid;
4799 
4800         skb->dev = sdata->dev;
4801 
4802         /*
4803          * The other path calling ieee80211_xmit is from the tasklet,
4804          * and while we can handle concurrent transmissions locking
4805          * requirements are that we do not come into tx with bhs on.
4806          */
4807         local_bh_disable();
4808         IEEE80211_SKB_CB(skb)->band = band;
4809         ieee80211_xmit(sdata, NULL, skb);
4810         local_bh_enable();
4811 }
4812 
4813 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
4814                               const u8 *buf, size_t len,
4815                               const u8 *dest, __be16 proto, bool unencrypted)
4816 {
4817         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4818         struct ieee80211_local *local = sdata->local;
4819         struct sk_buff *skb;
4820         struct ethhdr *ehdr;
4821         u32 flags;
4822 
4823         /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE
4824          * or Pre-Authentication
4825          */
4826         if (proto != sdata->control_port_protocol &&
4827             proto != cpu_to_be16(ETH_P_PREAUTH))
4828                 return -EINVAL;
4829 
4830         if (unencrypted)
4831                 flags = IEEE80211_TX_INTFL_DONT_ENCRYPT;
4832         else
4833                 flags = 0;
4834 
4835         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
4836                             sizeof(struct ethhdr) + len);
4837         if (!skb)
4838                 return -ENOMEM;
4839 
4840         skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr));
4841 
4842         skb_put_data(skb, buf, len);
4843 
4844         ehdr = skb_push(skb, sizeof(struct ethhdr));
4845         memcpy(ehdr->h_dest, dest, ETH_ALEN);
4846         memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
4847         ehdr->h_proto = proto;
4848 
4849         skb->dev = dev;
4850         skb->protocol = htons(ETH_P_802_3);
4851         skb_reset_network_header(skb);
4852         skb_reset_mac_header(skb);
4853 
4854         local_bh_disable();
4855         __ieee80211_subif_start_xmit(skb, skb->dev, flags);
4856         local_bh_enable();
4857 
4858         return 0;
4859 }
4860 

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