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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         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
218 
219         /* driver doesn't support power save */
220         if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
221                 return TX_CONTINUE;
222 
223         /* hardware does dynamic power save */
224         if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
225                 return TX_CONTINUE;
226 
227         /* dynamic power save disabled */
228         if (local->hw.conf.dynamic_ps_timeout <= 0)
229                 return TX_CONTINUE;
230 
231         /* we are scanning, don't enable power save */
232         if (local->scanning)
233                 return TX_CONTINUE;
234 
235         if (!local->ps_sdata)
236                 return TX_CONTINUE;
237 
238         /* No point if we're going to suspend */
239         if (local->quiescing)
240                 return TX_CONTINUE;
241 
242         /* dynamic ps is supported only in managed mode */
243         if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
244                 return TX_CONTINUE;
245 
246         if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK))
247                 return TX_CONTINUE;
248 
249         ifmgd = &tx->sdata->u.mgd;
250 
251         /*
252          * Don't wakeup from power save if u-apsd is enabled, voip ac has
253          * u-apsd enabled and the frame is in voip class. This effectively
254          * means that even if all access categories have u-apsd enabled, in
255          * practise u-apsd is only used with the voip ac. This is a
256          * workaround for the case when received voip class packets do not
257          * have correct qos tag for some reason, due the network or the
258          * peer application.
259          *
260          * Note: ifmgd->uapsd_queues access is racy here. If the value is
261          * changed via debugfs, user needs to reassociate manually to have
262          * everything in sync.
263          */
264         if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
265             (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
266             skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
267                 return TX_CONTINUE;
268 
269         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
270                 ieee80211_stop_queues_by_reason(&local->hw,
271                                                 IEEE80211_MAX_QUEUE_MAP,
272                                                 IEEE80211_QUEUE_STOP_REASON_PS,
273                                                 false);
274                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
275                 ieee80211_queue_work(&local->hw,
276                                      &local->dynamic_ps_disable_work);
277         }
278 
279         /* Don't restart the timer if we're not disassociated */
280         if (!ifmgd->associated)
281                 return TX_CONTINUE;
282 
283         mod_timer(&local->dynamic_ps_timer, jiffies +
284                   msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
285 
286         return TX_CONTINUE;
287 }
288 
289 static ieee80211_tx_result debug_noinline
290 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
291 {
292 
293         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
294         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
295         bool assoc = false;
296 
297         if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
298                 return TX_CONTINUE;
299 
300         if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
301             test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
302             !ieee80211_is_probe_req(hdr->frame_control) &&
303             !ieee80211_is_nullfunc(hdr->frame_control))
304                 /*
305                  * When software scanning only nullfunc frames (to notify
306                  * the sleep state to the AP) and probe requests (for the
307                  * active scan) are allowed, all other frames should not be
308                  * sent and we should not get here, but if we do
309                  * nonetheless, drop them to avoid sending them
310                  * off-channel. See the link below and
311                  * ieee80211_start_scan() for more.
312                  *
313                  * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
314                  */
315                 return TX_DROP;
316 
317         if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
318                 return TX_CONTINUE;
319 
320         if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
321                 return TX_CONTINUE;
322 
323         if (tx->flags & IEEE80211_TX_PS_BUFFERED)
324                 return TX_CONTINUE;
325 
326         if (tx->sta)
327                 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
328 
329         if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
330                 if (unlikely(!assoc &&
331                              ieee80211_is_data(hdr->frame_control))) {
332 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
333                         sdata_info(tx->sdata,
334                                    "dropped data frame to not associated station %pM\n",
335                                    hdr->addr1);
336 #endif
337                         I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
338                         return TX_DROP;
339                 }
340         } else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
341                             ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
342                 /*
343                  * No associated STAs - no need to send multicast
344                  * frames.
345                  */
346                 return TX_DROP;
347         }
348 
349         return TX_CONTINUE;
350 }
351 
352 /* This function is called whenever the AP is about to exceed the maximum limit
353  * of buffered frames for power saving STAs. This situation should not really
354  * happen often during normal operation, so dropping the oldest buffered packet
355  * from each queue should be OK to make some room for new frames. */
356 static void purge_old_ps_buffers(struct ieee80211_local *local)
357 {
358         int total = 0, purged = 0;
359         struct sk_buff *skb;
360         struct ieee80211_sub_if_data *sdata;
361         struct sta_info *sta;
362 
363         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
364                 struct ps_data *ps;
365 
366                 if (sdata->vif.type == NL80211_IFTYPE_AP)
367                         ps = &sdata->u.ap.ps;
368                 else if (ieee80211_vif_is_mesh(&sdata->vif))
369                         ps = &sdata->u.mesh.ps;
370                 else
371                         continue;
372 
373                 skb = skb_dequeue(&ps->bc_buf);
374                 if (skb) {
375                         purged++;
376                         ieee80211_free_txskb(&local->hw, skb);
377                 }
378                 total += skb_queue_len(&ps->bc_buf);
379         }
380 
381         /*
382          * Drop one frame from each station from the lowest-priority
383          * AC that has frames at all.
384          */
385         list_for_each_entry_rcu(sta, &local->sta_list, list) {
386                 int ac;
387 
388                 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
389                         skb = skb_dequeue(&sta->ps_tx_buf[ac]);
390                         total += skb_queue_len(&sta->ps_tx_buf[ac]);
391                         if (skb) {
392                                 purged++;
393                                 ieee80211_free_txskb(&local->hw, skb);
394                                 break;
395                         }
396                 }
397         }
398 
399         local->total_ps_buffered = total;
400         ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
401 }
402 
403 static ieee80211_tx_result
404 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
405 {
406         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
407         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
408         struct ps_data *ps;
409 
410         /*
411          * broadcast/multicast frame
412          *
413          * If any of the associated/peer stations is in power save mode,
414          * the frame is buffered to be sent after DTIM beacon frame.
415          * This is done either by the hardware or us.
416          */
417 
418         /* powersaving STAs currently only in AP/VLAN/mesh mode */
419         if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
420             tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
421                 if (!tx->sdata->bss)
422                         return TX_CONTINUE;
423 
424                 ps = &tx->sdata->bss->ps;
425         } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
426                 ps = &tx->sdata->u.mesh.ps;
427         } else {
428                 return TX_CONTINUE;
429         }
430 
431 
432         /* no buffering for ordered frames */
433         if (ieee80211_has_order(hdr->frame_control))
434                 return TX_CONTINUE;
435 
436         if (ieee80211_is_probe_req(hdr->frame_control))
437                 return TX_CONTINUE;
438 
439         if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
440                 info->hw_queue = tx->sdata->vif.cab_queue;
441 
442         /* no stations in PS mode and no buffered packets */
443         if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf))
444                 return TX_CONTINUE;
445 
446         info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
447 
448         /* device releases frame after DTIM beacon */
449         if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
450                 return TX_CONTINUE;
451 
452         /* buffered in mac80211 */
453         if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
454                 purge_old_ps_buffers(tx->local);
455 
456         if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
457                 ps_dbg(tx->sdata,
458                        "BC TX buffer full - dropping the oldest frame\n");
459                 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
460         } else
461                 tx->local->total_ps_buffered++;
462 
463         skb_queue_tail(&ps->bc_buf, tx->skb);
464 
465         return TX_QUEUED;
466 }
467 
468 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
469                              struct sk_buff *skb)
470 {
471         if (!ieee80211_is_mgmt(fc))
472                 return 0;
473 
474         if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
475                 return 0;
476 
477         if (!ieee80211_is_robust_mgmt_frame(skb))
478                 return 0;
479 
480         return 1;
481 }
482 
483 static ieee80211_tx_result
484 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
485 {
486         struct sta_info *sta = tx->sta;
487         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
488         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
489         struct ieee80211_local *local = tx->local;
490 
491         if (unlikely(!sta))
492                 return TX_CONTINUE;
493 
494         if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
495                       test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
496                       test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
497                      !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
498                 int ac = skb_get_queue_mapping(tx->skb);
499 
500                 if (ieee80211_is_mgmt(hdr->frame_control) &&
501                     !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
502                         info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
503                         return TX_CONTINUE;
504                 }
505 
506                 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
507                        sta->sta.addr, sta->sta.aid, ac);
508                 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
509                         purge_old_ps_buffers(tx->local);
510 
511                 /* sync with ieee80211_sta_ps_deliver_wakeup */
512                 spin_lock(&sta->ps_lock);
513                 /*
514                  * STA woke up the meantime and all the frames on ps_tx_buf have
515                  * been queued to pending queue. No reordering can happen, go
516                  * ahead and Tx the packet.
517                  */
518                 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
519                     !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
520                     !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
521                         spin_unlock(&sta->ps_lock);
522                         return TX_CONTINUE;
523                 }
524 
525                 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
526                         struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
527                         ps_dbg(tx->sdata,
528                                "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
529                                sta->sta.addr, ac);
530                         ieee80211_free_txskb(&local->hw, old);
531                 } else
532                         tx->local->total_ps_buffered++;
533 
534                 info->control.jiffies = jiffies;
535                 info->control.vif = &tx->sdata->vif;
536                 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
537                 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
538                 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
539                 spin_unlock(&sta->ps_lock);
540 
541                 if (!timer_pending(&local->sta_cleanup))
542                         mod_timer(&local->sta_cleanup,
543                                   round_jiffies(jiffies +
544                                                 STA_INFO_CLEANUP_INTERVAL));
545 
546                 /*
547                  * We queued up some frames, so the TIM bit might
548                  * need to be set, recalculate it.
549                  */
550                 sta_info_recalc_tim(sta);
551 
552                 return TX_QUEUED;
553         } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
554                 ps_dbg(tx->sdata,
555                        "STA %pM in PS mode, but polling/in SP -> send frame\n",
556                        sta->sta.addr);
557         }
558 
559         return TX_CONTINUE;
560 }
561 
562 static ieee80211_tx_result debug_noinline
563 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
564 {
565         if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
566                 return TX_CONTINUE;
567 
568         if (tx->flags & IEEE80211_TX_UNICAST)
569                 return ieee80211_tx_h_unicast_ps_buf(tx);
570         else
571                 return ieee80211_tx_h_multicast_ps_buf(tx);
572 }
573 
574 static ieee80211_tx_result debug_noinline
575 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
576 {
577         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
578 
579         if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
580                 if (tx->sdata->control_port_no_encrypt)
581                         info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
582                 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
583                 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
584         }
585 
586         return TX_CONTINUE;
587 }
588 
589 static ieee80211_tx_result debug_noinline
590 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
591 {
592         struct ieee80211_key *key;
593         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
594         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
595 
596         if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
597                 tx->key = NULL;
598         else if (tx->sta &&
599                  (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
600                 tx->key = key;
601         else if (ieee80211_is_group_privacy_action(tx->skb) &&
602                 (key = rcu_dereference(tx->sdata->default_multicast_key)))
603                 tx->key = key;
604         else if (ieee80211_is_mgmt(hdr->frame_control) &&
605                  is_multicast_ether_addr(hdr->addr1) &&
606                  ieee80211_is_robust_mgmt_frame(tx->skb) &&
607                  (key = rcu_dereference(tx->sdata->default_mgmt_key)))
608                 tx->key = key;
609         else if (is_multicast_ether_addr(hdr->addr1) &&
610                  (key = rcu_dereference(tx->sdata->default_multicast_key)))
611                 tx->key = key;
612         else if (!is_multicast_ether_addr(hdr->addr1) &&
613                  (key = rcu_dereference(tx->sdata->default_unicast_key)))
614                 tx->key = key;
615         else
616                 tx->key = NULL;
617 
618         if (tx->key) {
619                 bool skip_hw = false;
620 
621                 /* TODO: add threshold stuff again */
622 
623                 switch (tx->key->conf.cipher) {
624                 case WLAN_CIPHER_SUITE_WEP40:
625                 case WLAN_CIPHER_SUITE_WEP104:
626                 case WLAN_CIPHER_SUITE_TKIP:
627                         if (!ieee80211_is_data_present(hdr->frame_control))
628                                 tx->key = NULL;
629                         break;
630                 case WLAN_CIPHER_SUITE_CCMP:
631                 case WLAN_CIPHER_SUITE_CCMP_256:
632                 case WLAN_CIPHER_SUITE_GCMP:
633                 case WLAN_CIPHER_SUITE_GCMP_256:
634                         if (!ieee80211_is_data_present(hdr->frame_control) &&
635                             !ieee80211_use_mfp(hdr->frame_control, tx->sta,
636                                                tx->skb) &&
637                             !ieee80211_is_group_privacy_action(tx->skb))
638                                 tx->key = NULL;
639                         else
640                                 skip_hw = (tx->key->conf.flags &
641                                            IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
642                                         ieee80211_is_mgmt(hdr->frame_control);
643                         break;
644                 case WLAN_CIPHER_SUITE_AES_CMAC:
645                 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
646                 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
647                 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
648                         if (!ieee80211_is_mgmt(hdr->frame_control))
649                                 tx->key = NULL;
650                         break;
651                 }
652 
653                 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
654                              !ieee80211_is_deauth(hdr->frame_control)))
655                         return TX_DROP;
656 
657                 if (!skip_hw && tx->key &&
658                     tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
659                         info->control.hw_key = &tx->key->conf;
660         }
661 
662         return TX_CONTINUE;
663 }
664 
665 static ieee80211_tx_result debug_noinline
666 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
667 {
668         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
669         struct ieee80211_hdr *hdr = (void *)tx->skb->data;
670         struct ieee80211_supported_band *sband;
671         u32 len;
672         struct ieee80211_tx_rate_control txrc;
673         struct ieee80211_sta_rates *ratetbl = NULL;
674         bool assoc = false;
675 
676         memset(&txrc, 0, sizeof(txrc));
677 
678         sband = tx->local->hw.wiphy->bands[info->band];
679 
680         len = min_t(u32, tx->skb->len + FCS_LEN,
681                          tx->local->hw.wiphy->frag_threshold);
682 
683         /* set up the tx rate control struct we give the RC algo */
684         txrc.hw = &tx->local->hw;
685         txrc.sband = sband;
686         txrc.bss_conf = &tx->sdata->vif.bss_conf;
687         txrc.skb = tx->skb;
688         txrc.reported_rate.idx = -1;
689         txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
690 
691         if (tx->sdata->rc_has_mcs_mask[info->band])
692                 txrc.rate_idx_mcs_mask =
693                         tx->sdata->rc_rateidx_mcs_mask[info->band];
694 
695         txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
696                     tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
697                     tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
698                     tx->sdata->vif.type == NL80211_IFTYPE_OCB);
699 
700         /* set up RTS protection if desired */
701         if (len > tx->local->hw.wiphy->rts_threshold) {
702                 txrc.rts = true;
703         }
704 
705         info->control.use_rts = txrc.rts;
706         info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
707 
708         /*
709          * Use short preamble if the BSS can handle it, but not for
710          * management frames unless we know the receiver can handle
711          * that -- the management frame might be to a station that
712          * just wants a probe response.
713          */
714         if (tx->sdata->vif.bss_conf.use_short_preamble &&
715             (ieee80211_is_data(hdr->frame_control) ||
716              (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
717                 txrc.short_preamble = true;
718 
719         info->control.short_preamble = txrc.short_preamble;
720 
721         /* don't ask rate control when rate already injected via radiotap */
722         if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
723                 return TX_CONTINUE;
724 
725         if (tx->sta)
726                 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
727 
728         /*
729          * Lets not bother rate control if we're associated and cannot
730          * talk to the sta. This should not happen.
731          */
732         if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
733                  !rate_usable_index_exists(sband, &tx->sta->sta),
734                  "%s: Dropped data frame as no usable bitrate found while "
735                  "scanning and associated. Target station: "
736                  "%pM on %d GHz band\n",
737                  tx->sdata->name, hdr->addr1,
738                  info->band ? 5 : 2))
739                 return TX_DROP;
740 
741         /*
742          * If we're associated with the sta at this point we know we can at
743          * least send the frame at the lowest bit rate.
744          */
745         rate_control_get_rate(tx->sdata, tx->sta, &txrc);
746 
747         if (tx->sta && !info->control.skip_table)
748                 ratetbl = rcu_dereference(tx->sta->sta.rates);
749 
750         if (unlikely(info->control.rates[0].idx < 0)) {
751                 if (ratetbl) {
752                         struct ieee80211_tx_rate rate = {
753                                 .idx = ratetbl->rate[0].idx,
754                                 .flags = ratetbl->rate[0].flags,
755                                 .count = ratetbl->rate[0].count
756                         };
757 
758                         if (ratetbl->rate[0].idx < 0)
759                                 return TX_DROP;
760 
761                         tx->rate = rate;
762                 } else {
763                         return TX_DROP;
764                 }
765         } else {
766                 tx->rate = info->control.rates[0];
767         }
768 
769         if (txrc.reported_rate.idx < 0) {
770                 txrc.reported_rate = tx->rate;
771                 if (tx->sta && ieee80211_is_data(hdr->frame_control))
772                         tx->sta->tx_stats.last_rate = txrc.reported_rate;
773         } else if (tx->sta)
774                 tx->sta->tx_stats.last_rate = txrc.reported_rate;
775 
776         if (ratetbl)
777                 return TX_CONTINUE;
778 
779         if (unlikely(!info->control.rates[0].count))
780                 info->control.rates[0].count = 1;
781 
782         if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
783                          (info->flags & IEEE80211_TX_CTL_NO_ACK)))
784                 info->control.rates[0].count = 1;
785 
786         return TX_CONTINUE;
787 }
788 
789 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
790 {
791         u16 *seq = &sta->tid_seq[tid];
792         __le16 ret = cpu_to_le16(*seq);
793 
794         /* Increase the sequence number. */
795         *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
796 
797         return ret;
798 }
799 
800 static ieee80211_tx_result debug_noinline
801 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
802 {
803         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
804         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
805         int tid;
806 
807         /*
808          * Packet injection may want to control the sequence
809          * number, if we have no matching interface then we
810          * neither assign one ourselves nor ask the driver to.
811          */
812         if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
813                 return TX_CONTINUE;
814 
815         if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
816                 return TX_CONTINUE;
817 
818         if (ieee80211_hdrlen(hdr->frame_control) < 24)
819                 return TX_CONTINUE;
820 
821         if (ieee80211_is_qos_nullfunc(hdr->frame_control))
822                 return TX_CONTINUE;
823 
824         /*
825          * Anything but QoS data that has a sequence number field
826          * (is long enough) gets a sequence number from the global
827          * counter.  QoS data frames with a multicast destination
828          * also use the global counter (802.11-2012 9.3.2.10).
829          */
830         if (!ieee80211_is_data_qos(hdr->frame_control) ||
831             is_multicast_ether_addr(hdr->addr1)) {
832                 if (tx->flags & IEEE80211_TX_NO_SEQNO)
833                         return TX_CONTINUE;
834                 /* driver should assign sequence number */
835                 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
836                 /* for pure STA mode without beacons, we can do it */
837                 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
838                 tx->sdata->sequence_number += 0x10;
839                 if (tx->sta)
840                         tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
841                 return TX_CONTINUE;
842         }
843 
844         /*
845          * This should be true for injected/management frames only, for
846          * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
847          * above since they are not QoS-data frames.
848          */
849         if (!tx->sta)
850                 return TX_CONTINUE;
851 
852         /* include per-STA, per-TID sequence counter */
853         tid = ieee80211_get_tid(hdr);
854         tx->sta->tx_stats.msdu[tid]++;
855 
856         hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
857 
858         return TX_CONTINUE;
859 }
860 
861 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
862                               struct sk_buff *skb, int hdrlen,
863                               int frag_threshold)
864 {
865         struct ieee80211_local *local = tx->local;
866         struct ieee80211_tx_info *info;
867         struct sk_buff *tmp;
868         int per_fragm = frag_threshold - hdrlen - FCS_LEN;
869         int pos = hdrlen + per_fragm;
870         int rem = skb->len - hdrlen - per_fragm;
871 
872         if (WARN_ON(rem < 0))
873                 return -EINVAL;
874 
875         /* first fragment was already added to queue by caller */
876 
877         while (rem) {
878                 int fraglen = per_fragm;
879 
880                 if (fraglen > rem)
881                         fraglen = rem;
882                 rem -= fraglen;
883                 tmp = dev_alloc_skb(local->tx_headroom +
884                                     frag_threshold +
885                                     tx->sdata->encrypt_headroom +
886                                     IEEE80211_ENCRYPT_TAILROOM);
887                 if (!tmp)
888                         return -ENOMEM;
889 
890                 __skb_queue_tail(&tx->skbs, tmp);
891 
892                 skb_reserve(tmp,
893                             local->tx_headroom + tx->sdata->encrypt_headroom);
894 
895                 /* copy control information */
896                 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
897 
898                 info = IEEE80211_SKB_CB(tmp);
899                 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
900                                  IEEE80211_TX_CTL_FIRST_FRAGMENT);
901 
902                 if (rem)
903                         info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
904 
905                 skb_copy_queue_mapping(tmp, skb);
906                 tmp->priority = skb->priority;
907                 tmp->dev = skb->dev;
908 
909                 /* copy header and data */
910                 skb_put_data(tmp, skb->data, hdrlen);
911                 skb_put_data(tmp, skb->data + pos, fraglen);
912 
913                 pos += fraglen;
914         }
915 
916         /* adjust first fragment's length */
917         skb_trim(skb, hdrlen + per_fragm);
918         return 0;
919 }
920 
921 static ieee80211_tx_result debug_noinline
922 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
923 {
924         struct sk_buff *skb = tx->skb;
925         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
926         struct ieee80211_hdr *hdr = (void *)skb->data;
927         int frag_threshold = tx->local->hw.wiphy->frag_threshold;
928         int hdrlen;
929         int fragnum;
930 
931         /* no matter what happens, tx->skb moves to tx->skbs */
932         __skb_queue_tail(&tx->skbs, skb);
933         tx->skb = NULL;
934 
935         if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
936                 return TX_CONTINUE;
937 
938         if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
939                 return TX_CONTINUE;
940 
941         /*
942          * Warn when submitting a fragmented A-MPDU frame and drop it.
943          * This scenario is handled in ieee80211_tx_prepare but extra
944          * caution taken here as fragmented ampdu may cause Tx stop.
945          */
946         if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
947                 return TX_DROP;
948 
949         hdrlen = ieee80211_hdrlen(hdr->frame_control);
950 
951         /* internal error, why isn't DONTFRAG set? */
952         if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
953                 return TX_DROP;
954 
955         /*
956          * Now fragment the frame. This will allocate all the fragments and
957          * chain them (using skb as the first fragment) to skb->next.
958          * During transmission, we will remove the successfully transmitted
959          * fragments from this list. When the low-level driver rejects one
960          * of the fragments then we will simply pretend to accept the skb
961          * but store it away as pending.
962          */
963         if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
964                 return TX_DROP;
965 
966         /* update duration/seq/flags of fragments */
967         fragnum = 0;
968 
969         skb_queue_walk(&tx->skbs, skb) {
970                 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
971 
972                 hdr = (void *)skb->data;
973                 info = IEEE80211_SKB_CB(skb);
974 
975                 if (!skb_queue_is_last(&tx->skbs, skb)) {
976                         hdr->frame_control |= morefrags;
977                         /*
978                          * No multi-rate retries for fragmented frames, that
979                          * would completely throw off the NAV at other STAs.
980                          */
981                         info->control.rates[1].idx = -1;
982                         info->control.rates[2].idx = -1;
983                         info->control.rates[3].idx = -1;
984                         BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
985                         info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
986                 } else {
987                         hdr->frame_control &= ~morefrags;
988                 }
989                 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
990                 fragnum++;
991         }
992 
993         return TX_CONTINUE;
994 }
995 
996 static ieee80211_tx_result debug_noinline
997 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
998 {
999         struct sk_buff *skb;
1000         int ac = -1;
1001 
1002         if (!tx->sta)
1003                 return TX_CONTINUE;
1004 
1005         skb_queue_walk(&tx->skbs, skb) {
1006                 ac = skb_get_queue_mapping(skb);
1007                 tx->sta->tx_stats.bytes[ac] += skb->len;
1008         }
1009         if (ac >= 0)
1010                 tx->sta->tx_stats.packets[ac]++;
1011 
1012         return TX_CONTINUE;
1013 }
1014 
1015 static ieee80211_tx_result debug_noinline
1016 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1017 {
1018         if (!tx->key)
1019                 return TX_CONTINUE;
1020 
1021         switch (tx->key->conf.cipher) {
1022         case WLAN_CIPHER_SUITE_WEP40:
1023         case WLAN_CIPHER_SUITE_WEP104:
1024                 return ieee80211_crypto_wep_encrypt(tx);
1025         case WLAN_CIPHER_SUITE_TKIP:
1026                 return ieee80211_crypto_tkip_encrypt(tx);
1027         case WLAN_CIPHER_SUITE_CCMP:
1028                 return ieee80211_crypto_ccmp_encrypt(
1029                         tx, IEEE80211_CCMP_MIC_LEN);
1030         case WLAN_CIPHER_SUITE_CCMP_256:
1031                 return ieee80211_crypto_ccmp_encrypt(
1032                         tx, IEEE80211_CCMP_256_MIC_LEN);
1033         case WLAN_CIPHER_SUITE_AES_CMAC:
1034                 return ieee80211_crypto_aes_cmac_encrypt(tx);
1035         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1036                 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1037         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1038         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1039                 return ieee80211_crypto_aes_gmac_encrypt(tx);
1040         case WLAN_CIPHER_SUITE_GCMP:
1041         case WLAN_CIPHER_SUITE_GCMP_256:
1042                 return ieee80211_crypto_gcmp_encrypt(tx);
1043         default:
1044                 return ieee80211_crypto_hw_encrypt(tx);
1045         }
1046 
1047         return TX_DROP;
1048 }
1049 
1050 static ieee80211_tx_result debug_noinline
1051 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1052 {
1053         struct sk_buff *skb;
1054         struct ieee80211_hdr *hdr;
1055         int next_len;
1056         bool group_addr;
1057 
1058         skb_queue_walk(&tx->skbs, skb) {
1059                 hdr = (void *) skb->data;
1060                 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1061                         break; /* must not overwrite AID */
1062                 if (!skb_queue_is_last(&tx->skbs, skb)) {
1063                         struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1064                         next_len = next->len;
1065                 } else
1066                         next_len = 0;
1067                 group_addr = is_multicast_ether_addr(hdr->addr1);
1068 
1069                 hdr->duration_id =
1070                         ieee80211_duration(tx, skb, group_addr, next_len);
1071         }
1072 
1073         return TX_CONTINUE;
1074 }
1075 
1076 /* actual transmit path */
1077 
1078 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1079                                   struct sk_buff *skb,
1080                                   struct ieee80211_tx_info *info,
1081                                   struct tid_ampdu_tx *tid_tx,
1082                                   int tid)
1083 {
1084         bool queued = false;
1085         bool reset_agg_timer = false;
1086         struct sk_buff *purge_skb = NULL;
1087 
1088         if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1089                 info->flags |= IEEE80211_TX_CTL_AMPDU;
1090                 reset_agg_timer = true;
1091         } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1092                 /*
1093                  * nothing -- this aggregation session is being started
1094                  * but that might still fail with the driver
1095                  */
1096         } else if (!tx->sta->sta.txq[tid]) {
1097                 spin_lock(&tx->sta->lock);
1098                 /*
1099                  * Need to re-check now, because we may get here
1100                  *
1101                  *  1) in the window during which the setup is actually
1102                  *     already done, but not marked yet because not all
1103                  *     packets are spliced over to the driver pending
1104                  *     queue yet -- if this happened we acquire the lock
1105                  *     either before or after the splice happens, but
1106                  *     need to recheck which of these cases happened.
1107                  *
1108                  *  2) during session teardown, if the OPERATIONAL bit
1109                  *     was cleared due to the teardown but the pointer
1110                  *     hasn't been assigned NULL yet (or we loaded it
1111                  *     before it was assigned) -- in this case it may
1112                  *     now be NULL which means we should just let the
1113                  *     packet pass through because splicing the frames
1114                  *     back is already done.
1115                  */
1116                 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1117 
1118                 if (!tid_tx) {
1119                         /* do nothing, let packet pass through */
1120                 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1121                         info->flags |= IEEE80211_TX_CTL_AMPDU;
1122                         reset_agg_timer = true;
1123                 } else {
1124                         queued = true;
1125                         if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1126                                 clear_sta_flag(tx->sta, WLAN_STA_SP);
1127                                 ps_dbg(tx->sta->sdata,
1128                                        "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1129                                        tx->sta->sta.addr, tx->sta->sta.aid);
1130                         }
1131                         info->control.vif = &tx->sdata->vif;
1132                         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1133                         info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1134                         __skb_queue_tail(&tid_tx->pending, skb);
1135                         if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1136                                 purge_skb = __skb_dequeue(&tid_tx->pending);
1137                 }
1138                 spin_unlock(&tx->sta->lock);
1139 
1140                 if (purge_skb)
1141                         ieee80211_free_txskb(&tx->local->hw, purge_skb);
1142         }
1143 
1144         /* reset session timer */
1145         if (reset_agg_timer)
1146                 tid_tx->last_tx = jiffies;
1147 
1148         return queued;
1149 }
1150 
1151 /*
1152  * initialises @tx
1153  * pass %NULL for the station if unknown, a valid pointer if known
1154  * or an ERR_PTR() if the station is known not to exist
1155  */
1156 static ieee80211_tx_result
1157 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1158                      struct ieee80211_tx_data *tx,
1159                      struct sta_info *sta, struct sk_buff *skb)
1160 {
1161         struct ieee80211_local *local = sdata->local;
1162         struct ieee80211_hdr *hdr;
1163         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1164         int tid;
1165 
1166         memset(tx, 0, sizeof(*tx));
1167         tx->skb = skb;
1168         tx->local = local;
1169         tx->sdata = sdata;
1170         __skb_queue_head_init(&tx->skbs);
1171 
1172         /*
1173          * If this flag is set to true anywhere, and we get here,
1174          * we are doing the needed processing, so remove the flag
1175          * now.
1176          */
1177         info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1178 
1179         hdr = (struct ieee80211_hdr *) skb->data;
1180 
1181         if (likely(sta)) {
1182                 if (!IS_ERR(sta))
1183                         tx->sta = sta;
1184         } else {
1185                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1186                         tx->sta = rcu_dereference(sdata->u.vlan.sta);
1187                         if (!tx->sta && sdata->wdev.use_4addr)
1188                                 return TX_DROP;
1189                 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1190                                           IEEE80211_TX_CTL_INJECTED) ||
1191                            tx->sdata->control_port_protocol == tx->skb->protocol) {
1192                         tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1193                 }
1194                 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1195                         tx->sta = sta_info_get(sdata, hdr->addr1);
1196         }
1197 
1198         if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1199             !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1200             ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1201             !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1202                 struct tid_ampdu_tx *tid_tx;
1203 
1204                 tid = ieee80211_get_tid(hdr);
1205 
1206                 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1207                 if (tid_tx) {
1208                         bool queued;
1209 
1210                         queued = ieee80211_tx_prep_agg(tx, skb, info,
1211                                                        tid_tx, tid);
1212 
1213                         if (unlikely(queued))
1214                                 return TX_QUEUED;
1215                 }
1216         }
1217 
1218         if (is_multicast_ether_addr(hdr->addr1)) {
1219                 tx->flags &= ~IEEE80211_TX_UNICAST;
1220                 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1221         } else
1222                 tx->flags |= IEEE80211_TX_UNICAST;
1223 
1224         if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1225                 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1226                     skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1227                     info->flags & IEEE80211_TX_CTL_AMPDU)
1228                         info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1229         }
1230 
1231         if (!tx->sta)
1232                 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1233         else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1234                 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1235                 ieee80211_check_fast_xmit(tx->sta);
1236         }
1237 
1238         info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1239 
1240         return TX_CONTINUE;
1241 }
1242 
1243 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1244                                           struct ieee80211_vif *vif,
1245                                           struct sta_info *sta,
1246                                           struct sk_buff *skb)
1247 {
1248         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1249         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1250         struct ieee80211_txq *txq = NULL;
1251 
1252         if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1253             (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1254                 return NULL;
1255 
1256         if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) {
1257                 if ((!ieee80211_is_mgmt(hdr->frame_control) ||
1258                      ieee80211_is_bufferable_mmpdu(hdr->frame_control) ||
1259                      vif->type == NL80211_IFTYPE_STATION) &&
1260                     sta && sta->uploaded) {
1261                         /*
1262                          * This will be NULL if the driver didn't set the
1263                          * opt-in hardware flag.
1264                          */
1265                         txq = sta->sta.txq[IEEE80211_NUM_TIDS];
1266                 }
1267         } else if (sta) {
1268                 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1269 
1270                 if (!sta->uploaded)
1271                         return NULL;
1272 
1273                 txq = sta->sta.txq[tid];
1274         } else if (vif) {
1275                 txq = vif->txq;
1276         }
1277 
1278         if (!txq)
1279                 return NULL;
1280 
1281         return to_txq_info(txq);
1282 }
1283 
1284 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1285 {
1286         IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1287 }
1288 
1289 static u32 codel_skb_len_func(const struct sk_buff *skb)
1290 {
1291         return skb->len;
1292 }
1293 
1294 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1295 {
1296         const struct ieee80211_tx_info *info;
1297 
1298         info = (const struct ieee80211_tx_info *)skb->cb;
1299         return info->control.enqueue_time;
1300 }
1301 
1302 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1303                                           void *ctx)
1304 {
1305         struct ieee80211_local *local;
1306         struct txq_info *txqi;
1307         struct fq *fq;
1308         struct fq_flow *flow;
1309 
1310         txqi = ctx;
1311         local = vif_to_sdata(txqi->txq.vif)->local;
1312         fq = &local->fq;
1313 
1314         if (cvars == &txqi->def_cvars)
1315                 flow = &txqi->def_flow;
1316         else
1317                 flow = &fq->flows[cvars - local->cvars];
1318 
1319         return fq_flow_dequeue(fq, flow);
1320 }
1321 
1322 static void codel_drop_func(struct sk_buff *skb,
1323                             void *ctx)
1324 {
1325         struct ieee80211_local *local;
1326         struct ieee80211_hw *hw;
1327         struct txq_info *txqi;
1328 
1329         txqi = ctx;
1330         local = vif_to_sdata(txqi->txq.vif)->local;
1331         hw = &local->hw;
1332 
1333         ieee80211_free_txskb(hw, skb);
1334 }
1335 
1336 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1337                                            struct fq_tin *tin,
1338                                            struct fq_flow *flow)
1339 {
1340         struct ieee80211_local *local;
1341         struct txq_info *txqi;
1342         struct codel_vars *cvars;
1343         struct codel_params *cparams;
1344         struct codel_stats *cstats;
1345 
1346         local = container_of(fq, struct ieee80211_local, fq);
1347         txqi = container_of(tin, struct txq_info, tin);
1348         cstats = &txqi->cstats;
1349 
1350         if (txqi->txq.sta) {
1351                 struct sta_info *sta = container_of(txqi->txq.sta,
1352                                                     struct sta_info, sta);
1353                 cparams = &sta->cparams;
1354         } else {
1355                 cparams = &local->cparams;
1356         }
1357 
1358         if (flow == &txqi->def_flow)
1359                 cvars = &txqi->def_cvars;
1360         else
1361                 cvars = &local->cvars[flow - fq->flows];
1362 
1363         return codel_dequeue(txqi,
1364                              &flow->backlog,
1365                              cparams,
1366                              cvars,
1367                              cstats,
1368                              codel_skb_len_func,
1369                              codel_skb_time_func,
1370                              codel_drop_func,
1371                              codel_dequeue_func);
1372 }
1373 
1374 static void fq_skb_free_func(struct fq *fq,
1375                              struct fq_tin *tin,
1376                              struct fq_flow *flow,
1377                              struct sk_buff *skb)
1378 {
1379         struct ieee80211_local *local;
1380 
1381         local = container_of(fq, struct ieee80211_local, fq);
1382         ieee80211_free_txskb(&local->hw, skb);
1383 }
1384 
1385 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1386                                                 struct fq_tin *tin,
1387                                                 int idx,
1388                                                 struct sk_buff *skb)
1389 {
1390         struct txq_info *txqi;
1391 
1392         txqi = container_of(tin, struct txq_info, tin);
1393         return &txqi->def_flow;
1394 }
1395 
1396 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1397                                   struct txq_info *txqi,
1398                                   struct sk_buff *skb)
1399 {
1400         struct fq *fq = &local->fq;
1401         struct fq_tin *tin = &txqi->tin;
1402 
1403         ieee80211_set_skb_enqueue_time(skb);
1404         fq_tin_enqueue(fq, tin, skb,
1405                        fq_skb_free_func,
1406                        fq_flow_get_default_func);
1407 }
1408 
1409 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin,
1410                                 struct fq_flow *flow, struct sk_buff *skb,
1411                                 void *data)
1412 {
1413         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1414 
1415         return info->control.vif == data;
1416 }
1417 
1418 void ieee80211_txq_remove_vlan(struct ieee80211_local *local,
1419                                struct ieee80211_sub_if_data *sdata)
1420 {
1421         struct fq *fq = &local->fq;
1422         struct txq_info *txqi;
1423         struct fq_tin *tin;
1424         struct ieee80211_sub_if_data *ap;
1425 
1426         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1427                 return;
1428 
1429         ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1430 
1431         if (!ap->vif.txq)
1432                 return;
1433 
1434         txqi = to_txq_info(ap->vif.txq);
1435         tin = &txqi->tin;
1436 
1437         spin_lock_bh(&fq->lock);
1438         fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif,
1439                       fq_skb_free_func);
1440         spin_unlock_bh(&fq->lock);
1441 }
1442 
1443 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1444                         struct sta_info *sta,
1445                         struct txq_info *txqi, int tid)
1446 {
1447         fq_tin_init(&txqi->tin);
1448         fq_flow_init(&txqi->def_flow);
1449         codel_vars_init(&txqi->def_cvars);
1450         codel_stats_init(&txqi->cstats);
1451         __skb_queue_head_init(&txqi->frags);
1452 
1453         txqi->txq.vif = &sdata->vif;
1454 
1455         if (!sta) {
1456                 sdata->vif.txq = &txqi->txq;
1457                 txqi->txq.tid = 0;
1458                 txqi->txq.ac = IEEE80211_AC_BE;
1459 
1460                 return;
1461         }
1462 
1463         if (tid == IEEE80211_NUM_TIDS) {
1464                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1465                         /* Drivers need to opt in to the management MPDU TXQ */
1466                         if (!ieee80211_hw_check(&sdata->local->hw,
1467                                                 STA_MMPDU_TXQ))
1468                                 return;
1469                 } else if (!ieee80211_hw_check(&sdata->local->hw,
1470                                                BUFF_MMPDU_TXQ)) {
1471                         /* Drivers need to opt in to the bufferable MMPDU TXQ */
1472                         return;
1473                 }
1474                 txqi->txq.ac = IEEE80211_AC_VO;
1475         } else {
1476                 txqi->txq.ac = ieee80211_ac_from_tid(tid);
1477         }
1478 
1479         txqi->txq.sta = &sta->sta;
1480         txqi->txq.tid = tid;
1481         sta->sta.txq[tid] = &txqi->txq;
1482 }
1483 
1484 void ieee80211_txq_purge(struct ieee80211_local *local,
1485                          struct txq_info *txqi)
1486 {
1487         struct fq *fq = &local->fq;
1488         struct fq_tin *tin = &txqi->tin;
1489 
1490         fq_tin_reset(fq, tin, fq_skb_free_func);
1491         ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1492 }
1493 
1494 void ieee80211_txq_set_params(struct ieee80211_local *local)
1495 {
1496         if (local->hw.wiphy->txq_limit)
1497                 local->fq.limit = local->hw.wiphy->txq_limit;
1498         else
1499                 local->hw.wiphy->txq_limit = local->fq.limit;
1500 
1501         if (local->hw.wiphy->txq_memory_limit)
1502                 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit;
1503         else
1504                 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit;
1505 
1506         if (local->hw.wiphy->txq_quantum)
1507                 local->fq.quantum = local->hw.wiphy->txq_quantum;
1508         else
1509                 local->hw.wiphy->txq_quantum = local->fq.quantum;
1510 }
1511 
1512 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1513 {
1514         struct fq *fq = &local->fq;
1515         int ret;
1516         int i;
1517         bool supp_vht = false;
1518         enum nl80211_band band;
1519 
1520         if (!local->ops->wake_tx_queue)
1521                 return 0;
1522 
1523         ret = fq_init(fq, 4096);
1524         if (ret)
1525                 return ret;
1526 
1527         /*
1528          * If the hardware doesn't support VHT, it is safe to limit the maximum
1529          * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1530          */
1531         for (band = 0; band < NUM_NL80211_BANDS; band++) {
1532                 struct ieee80211_supported_band *sband;
1533 
1534                 sband = local->hw.wiphy->bands[band];
1535                 if (!sband)
1536                         continue;
1537 
1538                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1539         }
1540 
1541         if (!supp_vht)
1542                 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1543 
1544         codel_params_init(&local->cparams);
1545         local->cparams.interval = MS2TIME(100);
1546         local->cparams.target = MS2TIME(20);
1547         local->cparams.ecn = true;
1548 
1549         local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1550                                GFP_KERNEL);
1551         if (!local->cvars) {
1552                 spin_lock_bh(&fq->lock);
1553                 fq_reset(fq, fq_skb_free_func);
1554                 spin_unlock_bh(&fq->lock);
1555                 return -ENOMEM;
1556         }
1557 
1558         for (i = 0; i < fq->flows_cnt; i++)
1559                 codel_vars_init(&local->cvars[i]);
1560 
1561         ieee80211_txq_set_params(local);
1562 
1563         return 0;
1564 }
1565 
1566 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1567 {
1568         struct fq *fq = &local->fq;
1569 
1570         if (!local->ops->wake_tx_queue)
1571                 return;
1572 
1573         kfree(local->cvars);
1574         local->cvars = NULL;
1575 
1576         spin_lock_bh(&fq->lock);
1577         fq_reset(fq, fq_skb_free_func);
1578         spin_unlock_bh(&fq->lock);
1579 }
1580 
1581 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1582                                 struct ieee80211_sub_if_data *sdata,
1583                                 struct sta_info *sta,
1584                                 struct sk_buff *skb)
1585 {
1586         struct fq *fq = &local->fq;
1587         struct ieee80211_vif *vif;
1588         struct txq_info *txqi;
1589 
1590         if (!local->ops->wake_tx_queue ||
1591             sdata->vif.type == NL80211_IFTYPE_MONITOR)
1592                 return false;
1593 
1594         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1595                 sdata = container_of(sdata->bss,
1596                                      struct ieee80211_sub_if_data, u.ap);
1597 
1598         vif = &sdata->vif;
1599         txqi = ieee80211_get_txq(local, vif, sta, skb);
1600 
1601         if (!txqi)
1602                 return false;
1603 
1604         spin_lock_bh(&fq->lock);
1605         ieee80211_txq_enqueue(local, txqi, skb);
1606         spin_unlock_bh(&fq->lock);
1607 
1608         drv_wake_tx_queue(local, txqi);
1609 
1610         return true;
1611 }
1612 
1613 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1614                                struct ieee80211_vif *vif,
1615                                struct ieee80211_sta *sta,
1616                                struct sk_buff_head *skbs,
1617                                bool txpending)
1618 {
1619         struct ieee80211_tx_control control = {};
1620         struct sk_buff *skb, *tmp;
1621         unsigned long flags;
1622 
1623         skb_queue_walk_safe(skbs, skb, tmp) {
1624                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1625                 int q = info->hw_queue;
1626 
1627 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1628                 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1629                         __skb_unlink(skb, skbs);
1630                         ieee80211_free_txskb(&local->hw, skb);
1631                         continue;
1632                 }
1633 #endif
1634 
1635                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1636                 if (local->queue_stop_reasons[q] ||
1637                     (!txpending && !skb_queue_empty(&local->pending[q]))) {
1638                         if (unlikely(info->flags &
1639                                      IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1640                                 if (local->queue_stop_reasons[q] &
1641                                     ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1642                                         /*
1643                                          * Drop off-channel frames if queues
1644                                          * are stopped for any reason other
1645                                          * than off-channel operation. Never
1646                                          * queue them.
1647                                          */
1648                                         spin_unlock_irqrestore(
1649                                                 &local->queue_stop_reason_lock,
1650                                                 flags);
1651                                         ieee80211_purge_tx_queue(&local->hw,
1652                                                                  skbs);
1653                                         return true;
1654                                 }
1655                         } else {
1656 
1657                                 /*
1658                                  * Since queue is stopped, queue up frames for
1659                                  * later transmission from the tx-pending
1660                                  * tasklet when the queue is woken again.
1661                                  */
1662                                 if (txpending)
1663                                         skb_queue_splice_init(skbs,
1664                                                               &local->pending[q]);
1665                                 else
1666                                         skb_queue_splice_tail_init(skbs,
1667                                                                    &local->pending[q]);
1668 
1669                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1670                                                        flags);
1671                                 return false;
1672                         }
1673                 }
1674                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1675 
1676                 info->control.vif = vif;
1677                 control.sta = sta;
1678 
1679                 __skb_unlink(skb, skbs);
1680                 drv_tx(local, &control, skb);
1681         }
1682 
1683         return true;
1684 }
1685 
1686 /*
1687  * Returns false if the frame couldn't be transmitted but was queued instead.
1688  */
1689 static bool __ieee80211_tx(struct ieee80211_local *local,
1690                            struct sk_buff_head *skbs, int led_len,
1691                            struct sta_info *sta, bool txpending)
1692 {
1693         struct ieee80211_tx_info *info;
1694         struct ieee80211_sub_if_data *sdata;
1695         struct ieee80211_vif *vif;
1696         struct ieee80211_sta *pubsta;
1697         struct sk_buff *skb;
1698         bool result = true;
1699         __le16 fc;
1700 
1701         if (WARN_ON(skb_queue_empty(skbs)))
1702                 return true;
1703 
1704         skb = skb_peek(skbs);
1705         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1706         info = IEEE80211_SKB_CB(skb);
1707         sdata = vif_to_sdata(info->control.vif);
1708         if (sta && !sta->uploaded)
1709                 sta = NULL;
1710 
1711         if (sta)
1712                 pubsta = &sta->sta;
1713         else
1714                 pubsta = NULL;
1715 
1716         switch (sdata->vif.type) {
1717         case NL80211_IFTYPE_MONITOR:
1718                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1719                         vif = &sdata->vif;
1720                         break;
1721                 }
1722                 sdata = rcu_dereference(local->monitor_sdata);
1723                 if (sdata) {
1724                         vif = &sdata->vif;
1725                         info->hw_queue =
1726                                 vif->hw_queue[skb_get_queue_mapping(skb)];
1727                 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1728                         ieee80211_purge_tx_queue(&local->hw, skbs);
1729                         return true;
1730                 } else
1731                         vif = NULL;
1732                 break;
1733         case NL80211_IFTYPE_AP_VLAN:
1734                 sdata = container_of(sdata->bss,
1735                                      struct ieee80211_sub_if_data, u.ap);
1736                 /* fall through */
1737         default:
1738                 vif = &sdata->vif;
1739                 break;
1740         }
1741 
1742         result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1743                                     txpending);
1744 
1745         ieee80211_tpt_led_trig_tx(local, fc, led_len);
1746 
1747         WARN_ON_ONCE(!skb_queue_empty(skbs));
1748 
1749         return result;
1750 }
1751 
1752 /*
1753  * Invoke TX handlers, return 0 on success and non-zero if the
1754  * frame was dropped or queued.
1755  *
1756  * The handlers are split into an early and late part. The latter is everything
1757  * that can be sensitive to reordering, and will be deferred to after packets
1758  * are dequeued from the intermediate queues (when they are enabled).
1759  */
1760 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1761 {
1762         ieee80211_tx_result res = TX_DROP;
1763 
1764 #define CALL_TXH(txh) \
1765         do {                            \
1766                 res = txh(tx);          \
1767                 if (res != TX_CONTINUE) \
1768                         goto txh_done;  \
1769         } while (0)
1770 
1771         CALL_TXH(ieee80211_tx_h_dynamic_ps);
1772         CALL_TXH(ieee80211_tx_h_check_assoc);
1773         CALL_TXH(ieee80211_tx_h_ps_buf);
1774         CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1775         CALL_TXH(ieee80211_tx_h_select_key);
1776         if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1777                 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1778 
1779  txh_done:
1780         if (unlikely(res == TX_DROP)) {
1781                 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1782                 if (tx->skb)
1783                         ieee80211_free_txskb(&tx->local->hw, tx->skb);
1784                 else
1785                         ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1786                 return -1;
1787         } else if (unlikely(res == TX_QUEUED)) {
1788                 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1789                 return -1;
1790         }
1791 
1792         return 0;
1793 }
1794 
1795 /*
1796  * Late handlers can be called while the sta lock is held. Handlers that can
1797  * cause packets to be generated will cause deadlock!
1798  */
1799 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1800 {
1801         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1802         ieee80211_tx_result res = TX_CONTINUE;
1803 
1804         if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1805                 __skb_queue_tail(&tx->skbs, tx->skb);
1806                 tx->skb = NULL;
1807                 goto txh_done;
1808         }
1809 
1810         CALL_TXH(ieee80211_tx_h_michael_mic_add);
1811         CALL_TXH(ieee80211_tx_h_sequence);
1812         CALL_TXH(ieee80211_tx_h_fragment);
1813         /* handlers after fragment must be aware of tx info fragmentation! */
1814         CALL_TXH(ieee80211_tx_h_stats);
1815         CALL_TXH(ieee80211_tx_h_encrypt);
1816         if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1817                 CALL_TXH(ieee80211_tx_h_calculate_duration);
1818 #undef CALL_TXH
1819 
1820  txh_done:
1821         if (unlikely(res == TX_DROP)) {
1822                 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1823                 if (tx->skb)
1824                         ieee80211_free_txskb(&tx->local->hw, tx->skb);
1825                 else
1826                         ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1827                 return -1;
1828         } else if (unlikely(res == TX_QUEUED)) {
1829                 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1830                 return -1;
1831         }
1832 
1833         return 0;
1834 }
1835 
1836 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1837 {
1838         int r = invoke_tx_handlers_early(tx);
1839 
1840         if (r)
1841                 return r;
1842         return invoke_tx_handlers_late(tx);
1843 }
1844 
1845 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1846                               struct ieee80211_vif *vif, struct sk_buff *skb,
1847                               int band, struct ieee80211_sta **sta)
1848 {
1849         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1850         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1851         struct ieee80211_tx_data tx;
1852         struct sk_buff *skb2;
1853 
1854         if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1855                 return false;
1856 
1857         info->band = band;
1858         info->control.vif = vif;
1859         info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1860 
1861         if (invoke_tx_handlers(&tx))
1862                 return false;
1863 
1864         if (sta) {
1865                 if (tx.sta)
1866                         *sta = &tx.sta->sta;
1867                 else
1868                         *sta = NULL;
1869         }
1870 
1871         /* this function isn't suitable for fragmented data frames */
1872         skb2 = __skb_dequeue(&tx.skbs);
1873         if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1874                 ieee80211_free_txskb(hw, skb2);
1875                 ieee80211_purge_tx_queue(hw, &tx.skbs);
1876                 return false;
1877         }
1878 
1879         return true;
1880 }
1881 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1882 
1883 /*
1884  * Returns false if the frame couldn't be transmitted but was queued instead.
1885  */
1886 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1887                          struct sta_info *sta, struct sk_buff *skb,
1888                          bool txpending, u32 txdata_flags)
1889 {
1890         struct ieee80211_local *local = sdata->local;
1891         struct ieee80211_tx_data tx;
1892         ieee80211_tx_result res_prepare;
1893         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1894         bool result = true;
1895         int led_len;
1896 
1897         if (unlikely(skb->len < 10)) {
1898                 dev_kfree_skb(skb);
1899                 return true;
1900         }
1901 
1902         /* initialises tx */
1903         led_len = skb->len;
1904         res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1905 
1906         tx.flags |= txdata_flags;
1907 
1908         if (unlikely(res_prepare == TX_DROP)) {
1909                 ieee80211_free_txskb(&local->hw, skb);
1910                 return true;
1911         } else if (unlikely(res_prepare == TX_QUEUED)) {
1912                 return true;
1913         }
1914 
1915         /* set up hw_queue value early */
1916         if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1917             !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1918                 info->hw_queue =
1919                         sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1920 
1921         if (invoke_tx_handlers_early(&tx))
1922                 return true;
1923 
1924         if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1925                 return true;
1926 
1927         if (!invoke_tx_handlers_late(&tx))
1928                 result = __ieee80211_tx(local, &tx.skbs, led_len,
1929                                         tx.sta, txpending);
1930 
1931         return result;
1932 }
1933 
1934 /* device xmit handlers */
1935 
1936 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1937                                 struct sk_buff *skb,
1938                                 int head_need, bool may_encrypt)
1939 {
1940         struct ieee80211_local *local = sdata->local;
1941         struct ieee80211_hdr *hdr;
1942         bool enc_tailroom;
1943         int tail_need = 0;
1944 
1945         hdr = (struct ieee80211_hdr *) skb->data;
1946         enc_tailroom = may_encrypt &&
1947                        (sdata->crypto_tx_tailroom_needed_cnt ||
1948                         ieee80211_is_mgmt(hdr->frame_control));
1949 
1950         if (enc_tailroom) {
1951                 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1952                 tail_need -= skb_tailroom(skb);
1953                 tail_need = max_t(int, tail_need, 0);
1954         }
1955 
1956         if (skb_cloned(skb) &&
1957             (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1958              !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom))
1959                 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1960         else if (head_need || tail_need)
1961                 I802_DEBUG_INC(local->tx_expand_skb_head);
1962         else
1963                 return 0;
1964 
1965         if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1966                 wiphy_debug(local->hw.wiphy,
1967                             "failed to reallocate TX buffer\n");
1968                 return -ENOMEM;
1969         }
1970 
1971         return 0;
1972 }
1973 
1974 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1975                     struct sta_info *sta, struct sk_buff *skb,
1976                     u32 txdata_flags)
1977 {
1978         struct ieee80211_local *local = sdata->local;
1979         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1980         struct ieee80211_hdr *hdr;
1981         int headroom;
1982         bool may_encrypt;
1983 
1984         may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1985 
1986         headroom = local->tx_headroom;
1987         if (may_encrypt)
1988                 headroom += sdata->encrypt_headroom;
1989         headroom -= skb_headroom(skb);
1990         headroom = max_t(int, 0, headroom);
1991 
1992         if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1993                 ieee80211_free_txskb(&local->hw, skb);
1994                 return;
1995         }
1996 
1997         hdr = (struct ieee80211_hdr *) skb->data;
1998         info->control.vif = &sdata->vif;
1999 
2000         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2001                 if (ieee80211_is_data(hdr->frame_control) &&
2002                     is_unicast_ether_addr(hdr->addr1)) {
2003                         if (mesh_nexthop_resolve(sdata, skb))
2004                                 return; /* skb queued: don't free */
2005                 } else {
2006                         ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
2007                 }
2008         }
2009 
2010         ieee80211_set_qos_hdr(sdata, skb);
2011         ieee80211_tx(sdata, sta, skb, false, txdata_flags);
2012 }
2013 
2014 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
2015                                         struct sk_buff *skb)
2016 {
2017         struct ieee80211_radiotap_iterator iterator;
2018         struct ieee80211_radiotap_header *rthdr =
2019                 (struct ieee80211_radiotap_header *) skb->data;
2020         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2021         struct ieee80211_supported_band *sband =
2022                 local->hw.wiphy->bands[info->band];
2023         int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
2024                                                    NULL);
2025         u16 txflags;
2026         u16 rate = 0;
2027         bool rate_found = false;
2028         u8 rate_retries = 0;
2029         u16 rate_flags = 0;
2030         u8 mcs_known, mcs_flags, mcs_bw;
2031         u16 vht_known;
2032         u8 vht_mcs = 0, vht_nss = 0;
2033         int i;
2034 
2035         info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
2036                        IEEE80211_TX_CTL_DONTFRAG;
2037 
2038         /*
2039          * for every radiotap entry that is present
2040          * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
2041          * entries present, or -EINVAL on error)
2042          */
2043 
2044         while (!ret) {
2045                 ret = ieee80211_radiotap_iterator_next(&iterator);
2046 
2047                 if (ret)
2048                         continue;
2049 
2050                 /* see if this argument is something we can use */
2051                 switch (iterator.this_arg_index) {
2052                 /*
2053                  * You must take care when dereferencing iterator.this_arg
2054                  * for multibyte types... the pointer is not aligned.  Use
2055                  * get_unaligned((type *)iterator.this_arg) to dereference
2056                  * iterator.this_arg for type "type" safely on all arches.
2057                 */
2058                 case IEEE80211_RADIOTAP_FLAGS:
2059                         if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
2060                                 /*
2061                                  * this indicates that the skb we have been
2062                                  * handed has the 32-bit FCS CRC at the end...
2063                                  * we should react to that by snipping it off
2064                                  * because it will be recomputed and added
2065                                  * on transmission
2066                                  */
2067                                 if (skb->len < (iterator._max_length + FCS_LEN))
2068                                         return false;
2069 
2070                                 skb_trim(skb, skb->len - FCS_LEN);
2071                         }
2072                         if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
2073                                 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
2074                         if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
2075                                 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
2076                         break;
2077 
2078                 case IEEE80211_RADIOTAP_TX_FLAGS:
2079                         txflags = get_unaligned_le16(iterator.this_arg);
2080                         if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
2081                                 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2082                         break;
2083 
2084                 case IEEE80211_RADIOTAP_RATE:
2085                         rate = *iterator.this_arg;
2086                         rate_flags = 0;
2087                         rate_found = true;
2088                         break;
2089 
2090                 case IEEE80211_RADIOTAP_DATA_RETRIES:
2091                         rate_retries = *iterator.this_arg;
2092                         break;
2093 
2094                 case IEEE80211_RADIOTAP_MCS:
2095                         mcs_known = iterator.this_arg[0];
2096                         mcs_flags = iterator.this_arg[1];
2097                         if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2098                                 break;
2099 
2100                         rate_found = true;
2101                         rate = iterator.this_arg[2];
2102                         rate_flags = IEEE80211_TX_RC_MCS;
2103 
2104                         if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2105                             mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2106                                 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2107 
2108                         mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2109                         if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2110                             mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2111                                 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2112                         break;
2113 
2114                 case IEEE80211_RADIOTAP_VHT:
2115                         vht_known = get_unaligned_le16(iterator.this_arg);
2116                         rate_found = true;
2117 
2118                         rate_flags = IEEE80211_TX_RC_VHT_MCS;
2119                         if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2120                             (iterator.this_arg[2] &
2121                              IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2122                                 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2123                         if (vht_known &
2124                             IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2125                                 if (iterator.this_arg[3] == 1)
2126                                         rate_flags |=
2127                                                 IEEE80211_TX_RC_40_MHZ_WIDTH;
2128                                 else if (iterator.this_arg[3] == 4)
2129                                         rate_flags |=
2130                                                 IEEE80211_TX_RC_80_MHZ_WIDTH;
2131                                 else if (iterator.this_arg[3] == 11)
2132                                         rate_flags |=
2133                                                 IEEE80211_TX_RC_160_MHZ_WIDTH;
2134                         }
2135 
2136                         vht_mcs = iterator.this_arg[4] >> 4;
2137                         vht_nss = iterator.this_arg[4] & 0xF;
2138                         break;
2139 
2140                 /*
2141                  * Please update the file
2142                  * Documentation/networking/mac80211-injection.txt
2143                  * when parsing new fields here.
2144                  */
2145 
2146                 default:
2147                         break;
2148                 }
2149         }
2150 
2151         if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2152                 return false;
2153 
2154         if (rate_found) {
2155                 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2156 
2157                 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2158                         info->control.rates[i].idx = -1;
2159                         info->control.rates[i].flags = 0;
2160                         info->control.rates[i].count = 0;
2161                 }
2162 
2163                 if (rate_flags & IEEE80211_TX_RC_MCS) {
2164                         info->control.rates[0].idx = rate;
2165                 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2166                         ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2167                                                vht_nss);
2168                 } else {
2169                         for (i = 0; i < sband->n_bitrates; i++) {
2170                                 if (rate * 5 != sband->bitrates[i].bitrate)
2171                                         continue;
2172 
2173                                 info->control.rates[0].idx = i;
2174                                 break;
2175                         }
2176                 }
2177 
2178                 if (info->control.rates[0].idx < 0)
2179                         info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2180 
2181                 info->control.rates[0].flags = rate_flags;
2182                 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2183                                                      local->hw.max_rate_tries);
2184         }
2185 
2186         /*
2187          * remove the radiotap header
2188          * iterator->_max_length was sanity-checked against
2189          * skb->len by iterator init
2190          */
2191         skb_pull(skb, iterator._max_length);
2192 
2193         return true;
2194 }
2195 
2196 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2197                                          struct net_device *dev)
2198 {
2199         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2200         struct ieee80211_chanctx_conf *chanctx_conf;
2201         struct ieee80211_radiotap_header *prthdr =
2202                 (struct ieee80211_radiotap_header *)skb->data;
2203         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2204         struct ieee80211_hdr *hdr;
2205         struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2206         struct cfg80211_chan_def *chandef;
2207         u16 len_rthdr;
2208         int hdrlen;
2209 
2210         /* check for not even having the fixed radiotap header part */
2211         if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2212                 goto fail; /* too short to be possibly valid */
2213 
2214         /* is it a header version we can trust to find length from? */
2215         if (unlikely(prthdr->it_version))
2216                 goto fail; /* only version 0 is supported */
2217 
2218         /* then there must be a radiotap header with a length we can use */
2219         len_rthdr = ieee80211_get_radiotap_len(skb->data);
2220 
2221         /* does the skb contain enough to deliver on the alleged length? */
2222         if (unlikely(skb->len < len_rthdr))
2223                 goto fail; /* skb too short for claimed rt header extent */
2224 
2225         /*
2226          * fix up the pointers accounting for the radiotap
2227          * header still being in there.  We are being given
2228          * a precooked IEEE80211 header so no need for
2229          * normal processing
2230          */
2231         skb_set_mac_header(skb, len_rthdr);
2232         /*
2233          * these are just fixed to the end of the rt area since we
2234          * don't have any better information and at this point, nobody cares
2235          */
2236         skb_set_network_header(skb, len_rthdr);
2237         skb_set_transport_header(skb, len_rthdr);
2238 
2239         if (skb->len < len_rthdr + 2)
2240                 goto fail;
2241 
2242         hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2243         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2244 
2245         if (skb->len < len_rthdr + hdrlen)
2246                 goto fail;
2247 
2248         /*
2249          * Initialize skb->protocol if the injected frame is a data frame
2250          * carrying a rfc1042 header
2251          */
2252         if (ieee80211_is_data(hdr->frame_control) &&
2253             skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2254                 u8 *payload = (u8 *)hdr + hdrlen;
2255 
2256                 if (ether_addr_equal(payload, rfc1042_header))
2257                         skb->protocol = cpu_to_be16((payload[6] << 8) |
2258                                                     payload[7]);
2259         }
2260 
2261         memset(info, 0, sizeof(*info));
2262 
2263         info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2264                       IEEE80211_TX_CTL_INJECTED;
2265 
2266         rcu_read_lock();
2267 
2268         /*
2269          * We process outgoing injected frames that have a local address
2270          * we handle as though they are non-injected frames.
2271          * This code here isn't entirely correct, the local MAC address
2272          * isn't always enough to find the interface to use; for proper
2273          * VLAN/WDS support we will need a different mechanism (which
2274          * likely isn't going to be monitor interfaces).
2275          */
2276         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2277 
2278         list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2279                 if (!ieee80211_sdata_running(tmp_sdata))
2280                         continue;
2281                 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2282                     tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2283                     tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2284                         continue;
2285                 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2286                         sdata = tmp_sdata;
2287                         break;
2288                 }
2289         }
2290 
2291         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2292         if (!chanctx_conf) {
2293                 tmp_sdata = rcu_dereference(local->monitor_sdata);
2294                 if (tmp_sdata)
2295                         chanctx_conf =
2296                                 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2297         }
2298 
2299         if (chanctx_conf)
2300                 chandef = &chanctx_conf->def;
2301         else if (!local->use_chanctx)
2302                 chandef = &local->_oper_chandef;
2303         else
2304                 goto fail_rcu;
2305 
2306         /*
2307          * Frame injection is not allowed if beaconing is not allowed
2308          * or if we need radar detection. Beaconing is usually not allowed when
2309          * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2310          * Passive scan is also used in world regulatory domains where
2311          * your country is not known and as such it should be treated as
2312          * NO TX unless the channel is explicitly allowed in which case
2313          * your current regulatory domain would not have the passive scan
2314          * flag.
2315          *
2316          * Since AP mode uses monitor interfaces to inject/TX management
2317          * frames we can make AP mode the exception to this rule once it
2318          * supports radar detection as its implementation can deal with
2319          * radar detection by itself. We can do that later by adding a
2320          * monitor flag interfaces used for AP support.
2321          */
2322         if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2323                                      sdata->vif.type))
2324                 goto fail_rcu;
2325 
2326         info->band = chandef->chan->band;
2327 
2328         /* process and remove the injection radiotap header */
2329         if (!ieee80211_parse_tx_radiotap(local, skb))
2330                 goto fail_rcu;
2331 
2332         ieee80211_xmit(sdata, NULL, skb, 0);
2333         rcu_read_unlock();
2334 
2335         return NETDEV_TX_OK;
2336 
2337 fail_rcu:
2338         rcu_read_unlock();
2339 fail:
2340         dev_kfree_skb(skb);
2341         return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2342 }
2343 
2344 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2345 {
2346         u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2347 
2348         return ethertype == ETH_P_TDLS &&
2349                skb->len > 14 &&
2350                skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2351 }
2352 
2353 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2354                                    struct sk_buff *skb,
2355                                    struct sta_info **sta_out)
2356 {
2357         struct sta_info *sta;
2358 
2359         switch (sdata->vif.type) {
2360         case NL80211_IFTYPE_AP_VLAN:
2361                 sta = rcu_dereference(sdata->u.vlan.sta);
2362                 if (sta) {
2363                         *sta_out = sta;
2364                         return 0;
2365                 } else if (sdata->wdev.use_4addr) {
2366                         return -ENOLINK;
2367                 }
2368                 /* fall through */
2369         case NL80211_IFTYPE_AP:
2370         case NL80211_IFTYPE_OCB:
2371         case NL80211_IFTYPE_ADHOC:
2372                 if (is_multicast_ether_addr(skb->data)) {
2373                         *sta_out = ERR_PTR(-ENOENT);
2374                         return 0;
2375                 }
2376                 sta = sta_info_get_bss(sdata, skb->data);
2377                 break;
2378         case NL80211_IFTYPE_WDS:
2379                 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2380                 break;
2381 #ifdef CONFIG_MAC80211_MESH
2382         case NL80211_IFTYPE_MESH_POINT:
2383                 /* determined much later */
2384                 *sta_out = NULL;
2385                 return 0;
2386 #endif
2387         case NL80211_IFTYPE_STATION:
2388                 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2389                         sta = sta_info_get(sdata, skb->data);
2390                         if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2391                                 if (test_sta_flag(sta,
2392                                                   WLAN_STA_TDLS_PEER_AUTH)) {
2393                                         *sta_out = sta;
2394                                         return 0;
2395                                 }
2396 
2397                                 /*
2398                                  * TDLS link during setup - throw out frames to
2399                                  * peer. Allow TDLS-setup frames to unauthorized
2400                                  * peers for the special case of a link teardown
2401                                  * after a TDLS sta is removed due to being
2402                                  * unreachable.
2403                                  */
2404                                 if (!ieee80211_is_tdls_setup(skb))
2405                                         return -EINVAL;
2406                         }
2407 
2408                 }
2409 
2410                 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2411                 if (!sta)
2412                         return -ENOLINK;
2413                 break;
2414         default:
2415                 return -EINVAL;
2416         }
2417 
2418         *sta_out = sta ?: ERR_PTR(-ENOENT);
2419         return 0;
2420 }
2421 
2422 /**
2423  * ieee80211_build_hdr - build 802.11 header in the given frame
2424  * @sdata: virtual interface to build the header for
2425  * @skb: the skb to build the header in
2426  * @info_flags: skb flags to set
2427  *
2428  * This function takes the skb with 802.3 header and reformats the header to
2429  * the appropriate IEEE 802.11 header based on which interface the packet is
2430  * being transmitted on.
2431  *
2432  * Note that this function also takes care of the TX status request and
2433  * potential unsharing of the SKB - this needs to be interleaved with the
2434  * header building.
2435  *
2436  * The function requires the read-side RCU lock held
2437  *
2438  * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2439  */
2440 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2441                                            struct sk_buff *skb, u32 info_flags,
2442                                            struct sta_info *sta)
2443 {
2444         struct ieee80211_local *local = sdata->local;
2445         struct ieee80211_tx_info *info;
2446         int head_need;
2447         u16 ethertype, hdrlen,  meshhdrlen = 0;
2448         __le16 fc;
2449         struct ieee80211_hdr hdr;
2450         struct ieee80211s_hdr mesh_hdr __maybe_unused;
2451         struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2452         const u8 *encaps_data;
2453         int encaps_len, skip_header_bytes;
2454         bool wme_sta = false, authorized = false;
2455         bool tdls_peer;
2456         bool multicast;
2457         u16 info_id = 0;
2458         struct ieee80211_chanctx_conf *chanctx_conf;
2459         struct ieee80211_sub_if_data *ap_sdata;
2460         enum nl80211_band band;
2461         int ret;
2462 
2463         if (IS_ERR(sta))
2464                 sta = NULL;
2465 
2466         /* convert Ethernet header to proper 802.11 header (based on
2467          * operation mode) */
2468         ethertype = (skb->data[12] << 8) | skb->data[13];
2469         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2470 
2471         switch (sdata->vif.type) {
2472         case NL80211_IFTYPE_AP_VLAN:
2473                 if (sdata->wdev.use_4addr) {
2474                         fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2475                         /* RA TA DA SA */
2476                         memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2477                         memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2478                         memcpy(hdr.addr3, skb->data, ETH_ALEN);
2479                         memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2480                         hdrlen = 30;
2481                         authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2482                         wme_sta = sta->sta.wme;
2483                 }
2484                 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2485                                         u.ap);
2486                 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2487                 if (!chanctx_conf) {
2488                         ret = -ENOTCONN;
2489                         goto free;
2490                 }
2491                 band = chanctx_conf->def.chan->band;
2492                 if (sdata->wdev.use_4addr)
2493                         break;
2494                 /* fall through */
2495         case NL80211_IFTYPE_AP:
2496                 if (sdata->vif.type == NL80211_IFTYPE_AP)
2497                         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2498                 if (!chanctx_conf) {
2499                         ret = -ENOTCONN;
2500                         goto free;
2501                 }
2502                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2503                 /* DA BSSID SA */
2504                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2505                 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2506                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2507                 hdrlen = 24;
2508                 band = chanctx_conf->def.chan->band;
2509                 break;
2510         case NL80211_IFTYPE_WDS:
2511                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2512                 /* RA TA DA SA */
2513                 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2514                 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2515                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2516                 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2517                 hdrlen = 30;
2518                 /*
2519                  * This is the exception! WDS style interfaces are prohibited
2520                  * when channel contexts are in used so this must be valid
2521                  */
2522                 band = local->hw.conf.chandef.chan->band;
2523                 break;
2524 #ifdef CONFIG_MAC80211_MESH
2525         case NL80211_IFTYPE_MESH_POINT:
2526                 if (!is_multicast_ether_addr(skb->data)) {
2527                         struct sta_info *next_hop;
2528                         bool mpp_lookup = true;
2529 
2530                         mpath = mesh_path_lookup(sdata, skb->data);
2531                         if (mpath) {
2532                                 mpp_lookup = false;
2533                                 next_hop = rcu_dereference(mpath->next_hop);
2534                                 if (!next_hop ||
2535                                     !(mpath->flags & (MESH_PATH_ACTIVE |
2536                                                       MESH_PATH_RESOLVING)))
2537                                         mpp_lookup = true;
2538                         }
2539 
2540                         if (mpp_lookup) {
2541                                 mppath = mpp_path_lookup(sdata, skb->data);
2542                                 if (mppath)
2543                                         mppath->exp_time = jiffies;
2544                         }
2545 
2546                         if (mppath && mpath)
2547                                 mesh_path_del(sdata, mpath->dst);
2548                 }
2549 
2550                 /*
2551                  * Use address extension if it is a packet from
2552                  * another interface or if we know the destination
2553                  * is being proxied by a portal (i.e. portal address
2554                  * differs from proxied address)
2555                  */
2556                 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2557                     !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2558                         hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2559                                         skb->data, skb->data + ETH_ALEN);
2560                         meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2561                                                                NULL, NULL);
2562                 } else {
2563                         /* DS -> MBSS (802.11-2012 13.11.3.3).
2564                          * For unicast with unknown forwarding information,
2565                          * destination might be in the MBSS or if that fails
2566                          * forwarded to another mesh gate. In either case
2567                          * resolution will be handled in ieee80211_xmit(), so
2568                          * leave the original DA. This also works for mcast */
2569                         const u8 *mesh_da = skb->data;
2570 
2571                         if (mppath)
2572                                 mesh_da = mppath->mpp;
2573                         else if (mpath)
2574                                 mesh_da = mpath->dst;
2575 
2576                         hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2577                                         mesh_da, sdata->vif.addr);
2578                         if (is_multicast_ether_addr(mesh_da))
2579                                 /* DA TA mSA AE:SA */
2580                                 meshhdrlen = ieee80211_new_mesh_header(
2581                                                 sdata, &mesh_hdr,
2582                                                 skb->data + ETH_ALEN, NULL);
2583                         else
2584                                 /* RA TA mDA mSA AE:DA SA */
2585                                 meshhdrlen = ieee80211_new_mesh_header(
2586                                                 sdata, &mesh_hdr, skb->data,
2587                                                 skb->data + ETH_ALEN);
2588 
2589                 }
2590                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2591                 if (!chanctx_conf) {
2592                         ret = -ENOTCONN;
2593                         goto free;
2594                 }
2595                 band = chanctx_conf->def.chan->band;
2596                 break;
2597 #endif
2598         case NL80211_IFTYPE_STATION:
2599                 /* we already did checks when looking up the RA STA */
2600                 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2601 
2602                 if (tdls_peer) {
2603                         /* DA SA BSSID */
2604                         memcpy(hdr.addr1, skb->data, ETH_ALEN);
2605                         memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2606                         memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2607                         hdrlen = 24;
2608                 }  else if (sdata->u.mgd.use_4addr &&
2609                             cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2610                         fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2611                                           IEEE80211_FCTL_TODS);
2612                         /* RA TA DA SA */
2613                         memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2614                         memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2615                         memcpy(hdr.addr3, skb->data, ETH_ALEN);
2616                         memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2617                         hdrlen = 30;
2618                 } else {
2619                         fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2620                         /* BSSID SA DA */
2621                         memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2622                         memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2623                         memcpy(hdr.addr3, skb->data, ETH_ALEN);
2624                         hdrlen = 24;
2625                 }
2626                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2627                 if (!chanctx_conf) {
2628                         ret = -ENOTCONN;
2629                         goto free;
2630                 }
2631                 band = chanctx_conf->def.chan->band;
2632                 break;
2633         case NL80211_IFTYPE_OCB:
2634                 /* DA SA BSSID */
2635                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2636                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2637                 eth_broadcast_addr(hdr.addr3);
2638                 hdrlen = 24;
2639                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2640                 if (!chanctx_conf) {
2641                         ret = -ENOTCONN;
2642                         goto free;
2643                 }
2644                 band = chanctx_conf->def.chan->band;
2645                 break;
2646         case NL80211_IFTYPE_ADHOC:
2647                 /* DA SA BSSID */
2648                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2649                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2650                 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2651                 hdrlen = 24;
2652                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2653                 if (!chanctx_conf) {
2654                         ret = -ENOTCONN;
2655                         goto free;
2656                 }
2657                 band = chanctx_conf->def.chan->band;
2658                 break;
2659         default:
2660                 ret = -EINVAL;
2661                 goto free;
2662         }
2663 
2664         multicast = is_multicast_ether_addr(hdr.addr1);
2665 
2666         /* sta is always NULL for mesh */
2667         if (sta) {
2668                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2669                 wme_sta = sta->sta.wme;
2670         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2671                 /* For mesh, the use of the QoS header is mandatory */
2672                 wme_sta = true;
2673         }
2674 
2675         /* receiver does QoS (which also means we do) use it */
2676         if (wme_sta) {
2677                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2678                 hdrlen += 2;
2679         }
2680 
2681         /*
2682          * Drop unicast frames to unauthorised stations unless they are
2683          * EAPOL frames from the local station.
2684          */
2685         if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2686                      (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2687                      !multicast && !authorized &&
2688                      (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2689                       !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2690 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2691                 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2692                                     sdata->name, hdr.addr1);
2693 #endif
2694 
2695                 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2696 
2697                 ret = -EPERM;
2698                 goto free;
2699         }
2700 
2701         if (unlikely(!multicast && skb->sk &&
2702                      skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2703                 struct sk_buff *ack_skb = skb_clone_sk(skb);
2704 
2705                 if (ack_skb) {
2706                         unsigned long flags;
2707                         int id;
2708 
2709                         spin_lock_irqsave(&local->ack_status_lock, flags);
2710                         id = idr_alloc(&local->ack_status_frames, ack_skb,
2711                                        1, 0x10000, GFP_ATOMIC);
2712                         spin_unlock_irqrestore(&local->ack_status_lock, flags);
2713 
2714                         if (id >= 0) {
2715                                 info_id = id;
2716                                 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2717                         } else {
2718                                 kfree_skb(ack_skb);
2719                         }
2720                 }
2721         }
2722 
2723         /*
2724          * If the skb is shared we need to obtain our own copy.
2725          */
2726         if (skb_shared(skb)) {
2727                 struct sk_buff *tmp_skb = skb;
2728 
2729                 /* can't happen -- skb is a clone if info_id != 0 */
2730                 WARN_ON(info_id);
2731 
2732                 skb = skb_clone(skb, GFP_ATOMIC);
2733                 kfree_skb(tmp_skb);
2734 
2735                 if (!skb) {
2736                         ret = -ENOMEM;
2737                         goto free;
2738                 }
2739         }
2740 
2741         hdr.frame_control = fc;
2742         hdr.duration_id = 0;
2743         hdr.seq_ctrl = 0;
2744 
2745         skip_header_bytes = ETH_HLEN;
2746         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2747                 encaps_data = bridge_tunnel_header;
2748                 encaps_len = sizeof(bridge_tunnel_header);
2749                 skip_header_bytes -= 2;
2750         } else if (ethertype >= ETH_P_802_3_MIN) {
2751                 encaps_data = rfc1042_header;
2752                 encaps_len = sizeof(rfc1042_header);
2753                 skip_header_bytes -= 2;
2754         } else {
2755                 encaps_data = NULL;
2756                 encaps_len = 0;
2757         }
2758 
2759         skb_pull(skb, skip_header_bytes);
2760         head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2761 
2762         /*
2763          * So we need to modify the skb header and hence need a copy of
2764          * that. The head_need variable above doesn't, so far, include
2765          * the needed header space that we don't need right away. If we
2766          * can, then we don't reallocate right now but only after the
2767          * frame arrives at the master device (if it does...)
2768          *
2769          * If we cannot, however, then we will reallocate to include all
2770          * the ever needed space. Also, if we need to reallocate it anyway,
2771          * make it big enough for everything we may ever need.
2772          */
2773 
2774         if (head_need > 0 || skb_cloned(skb)) {
2775                 head_need += sdata->encrypt_headroom;
2776                 head_need += local->tx_headroom;
2777                 head_need = max_t(int, 0, head_need);
2778                 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2779                         ieee80211_free_txskb(&local->hw, skb);
2780                         skb = NULL;
2781                         return ERR_PTR(-ENOMEM);
2782                 }
2783         }
2784 
2785         if (encaps_data)
2786                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2787 
2788 #ifdef CONFIG_MAC80211_MESH
2789         if (meshhdrlen > 0)
2790                 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2791 #endif
2792 
2793         if (ieee80211_is_data_qos(fc)) {
2794                 __le16 *qos_control;
2795 
2796                 qos_control = skb_push(skb, 2);
2797                 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2798                 /*
2799                  * Maybe we could actually set some fields here, for now just
2800                  * initialise to zero to indicate no special operation.
2801                  */
2802                 *qos_control = 0;
2803         } else
2804                 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2805 
2806         skb_reset_mac_header(skb);
2807 
2808         info = IEEE80211_SKB_CB(skb);
2809         memset(info, 0, sizeof(*info));
2810 
2811         info->flags = info_flags;
2812         info->ack_frame_id = info_id;
2813         info->band = band;
2814 
2815         return skb;
2816  free:
2817         kfree_skb(skb);
2818         return ERR_PTR(ret);
2819 }
2820 
2821 /*
2822  * fast-xmit overview
2823  *
2824  * The core idea of this fast-xmit is to remove per-packet checks by checking
2825  * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2826  * checks that are needed to get the sta->fast_tx pointer assigned, after which
2827  * much less work can be done per packet. For example, fragmentation must be
2828  * disabled or the fast_tx pointer will not be set. All the conditions are seen
2829  * in the code here.
2830  *
2831  * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2832  * header and other data to aid packet processing in ieee80211_xmit_fast().
2833  *
2834  * The most difficult part of this is that when any of these assumptions
2835  * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2836  * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2837  * since the per-packet code no longer checks the conditions. This is reflected
2838  * by the calls to these functions throughout the rest of the code, and must be
2839  * maintained if any of the TX path checks change.
2840  */
2841 
2842 void ieee80211_check_fast_xmit(struct sta_info *sta)
2843 {
2844         struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2845         struct ieee80211_local *local = sta->local;
2846         struct ieee80211_sub_if_data *sdata = sta->sdata;
2847         struct ieee80211_hdr *hdr = (void *)build.hdr;
2848         struct ieee80211_chanctx_conf *chanctx_conf;
2849         __le16 fc;
2850 
2851         if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2852                 return;
2853 
2854         /* Locking here protects both the pointer itself, and against concurrent
2855          * invocations winning data access races to, e.g., the key pointer that
2856          * is used.
2857          * Without it, the invocation of this function right after the key
2858          * pointer changes wouldn't be sufficient, as another CPU could access
2859          * the pointer, then stall, and then do the cache update after the CPU
2860          * that invalidated the key.
2861          * With the locking, such scenarios cannot happen as the check for the
2862          * key and the fast-tx assignment are done atomically, so the CPU that
2863          * modifies the key will either wait or other one will see the key
2864          * cleared/changed already.
2865          */
2866         spin_lock_bh(&sta->lock);
2867         if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2868             !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2869             sdata->vif.type == NL80211_IFTYPE_STATION)
2870                 goto out;
2871 
2872         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2873                 goto out;
2874 
2875         if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2876             test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2877             test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2878             test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2879                 goto out;
2880 
2881         if (sdata->noack_map)
2882                 goto out;
2883 
2884         /* fast-xmit doesn't handle fragmentation at all */
2885         if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2886             !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
2887                 goto out;
2888 
2889         rcu_read_lock();
2890         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2891         if (!chanctx_conf) {
2892                 rcu_read_unlock();
2893                 goto out;
2894         }
2895         build.band = chanctx_conf->def.chan->band;
2896         rcu_read_unlock();
2897 
2898         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2899 
2900         switch (sdata->vif.type) {
2901         case NL80211_IFTYPE_ADHOC:
2902                 /* DA SA BSSID */
2903                 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2904                 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2905                 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2906                 build.hdr_len = 24;
2907                 break;
2908         case NL80211_IFTYPE_STATION:
2909                 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2910                         /* DA SA BSSID */
2911                         build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2912                         build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2913                         memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2914                         build.hdr_len = 24;
2915                         break;
2916                 }
2917 
2918                 if (sdata->u.mgd.use_4addr) {
2919                         /* non-regular ethertype cannot use the fastpath */
2920                         fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2921                                           IEEE80211_FCTL_TODS);
2922                         /* RA TA DA SA */
2923                         memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2924                         memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2925                         build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2926                         build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2927                         build.hdr_len = 30;
2928                         break;
2929                 }
2930                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2931                 /* BSSID SA DA */
2932                 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2933                 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2934                 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2935                 build.hdr_len = 24;
2936                 break;
2937         case NL80211_IFTYPE_AP_VLAN:
2938                 if (sdata->wdev.use_4addr) {
2939                         fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2940                                           IEEE80211_FCTL_TODS);
2941                         /* RA TA DA SA */
2942                         memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2943                         memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2944                         build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2945                         build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2946                         build.hdr_len = 30;
2947                         break;
2948                 }
2949                 /* fall through */
2950         case NL80211_IFTYPE_AP:
2951                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2952                 /* DA BSSID SA */
2953                 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2954                 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2955                 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2956                 build.hdr_len = 24;
2957                 break;
2958         default:
2959                 /* not handled on fast-xmit */
2960                 goto out;
2961         }
2962 
2963         if (sta->sta.wme) {
2964                 build.hdr_len += 2;
2965                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2966         }
2967 
2968         /* We store the key here so there's no point in using rcu_dereference()
2969          * but that's fine because the code that changes the pointers will call
2970          * this function after doing so. For a single CPU that would be enough,
2971          * for multiple see the comment above.
2972          */
2973         build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2974         if (!build.key)
2975                 build.key = rcu_access_pointer(sdata->default_unicast_key);
2976         if (build.key) {
2977                 bool gen_iv, iv_spc, mmic;
2978 
2979                 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2980                 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2981                 mmic = build.key->conf.flags &
2982                         (IEEE80211_KEY_FLAG_GENERATE_MMIC |
2983                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE);
2984 
2985                 /* don't handle software crypto */
2986                 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2987                         goto out;
2988 
2989                 /* Key is being removed */
2990                 if (build.key->flags & KEY_FLAG_TAINTED)
2991                         goto out;
2992 
2993                 switch (build.key->conf.cipher) {
2994                 case WLAN_CIPHER_SUITE_CCMP:
2995                 case WLAN_CIPHER_SUITE_CCMP_256:
2996                         /* add fixed key ID */
2997                         if (gen_iv) {
2998                                 (build.hdr + build.hdr_len)[3] =
2999                                         0x20 | (build.key->conf.keyidx << 6);
3000                                 build.pn_offs = build.hdr_len;
3001                         }
3002                         if (gen_iv || iv_spc)
3003                                 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
3004                         break;
3005                 case WLAN_CIPHER_SUITE_GCMP:
3006                 case WLAN_CIPHER_SUITE_GCMP_256:
3007                         /* add fixed key ID */
3008                         if (gen_iv) {
3009                                 (build.hdr + build.hdr_len)[3] =
3010                                         0x20 | (build.key->conf.keyidx << 6);
3011                                 build.pn_offs = build.hdr_len;
3012                         }
3013                         if (gen_iv || iv_spc)
3014                                 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
3015                         break;
3016                 case WLAN_CIPHER_SUITE_TKIP:
3017                         /* cannot handle MMIC or IV generation in xmit-fast */
3018                         if (mmic || gen_iv)
3019                                 goto out;
3020                         if (iv_spc)
3021                                 build.hdr_len += IEEE80211_TKIP_IV_LEN;
3022                         break;
3023                 case WLAN_CIPHER_SUITE_WEP40:
3024                 case WLAN_CIPHER_SUITE_WEP104:
3025                         /* cannot handle IV generation in fast-xmit */
3026                         if (gen_iv)
3027                                 goto out;
3028                         if (iv_spc)
3029                                 build.hdr_len += IEEE80211_WEP_IV_LEN;
3030                         break;
3031                 case WLAN_CIPHER_SUITE_AES_CMAC:
3032                 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
3033                 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
3034                 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
3035                         WARN(1,
3036                              "management cipher suite 0x%x enabled for data\n",
3037                              build.key->conf.cipher);
3038                         goto out;
3039                 default:
3040                         /* we don't know how to generate IVs for this at all */
3041                         if (WARN_ON(gen_iv))
3042                                 goto out;
3043                         /* pure hardware keys are OK, of course */
3044                         if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
3045                                 break;
3046                         /* cipher scheme might require space allocation */
3047                         if (iv_spc &&
3048                             build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
3049                                 goto out;
3050                         if (iv_spc)
3051                                 build.hdr_len += build.key->conf.iv_len;
3052                 }
3053 
3054                 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
3055         }
3056 
3057         hdr->frame_control = fc;
3058 
3059         memcpy(build.hdr + build.hdr_len,
3060                rfc1042_header,  sizeof(rfc1042_header));
3061         build.hdr_len += sizeof(rfc1042_header);
3062 
3063         fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
3064         /* if the kmemdup fails, continue w/o fast_tx */
3065         if (!fast_tx)
3066                 goto out;
3067 
3068  out:
3069         /* we might have raced against another call to this function */
3070         old = rcu_dereference_protected(sta->fast_tx,
3071                                         lockdep_is_held(&sta->lock));
3072         rcu_assign_pointer(sta->fast_tx, fast_tx);
3073         if (old)
3074                 kfree_rcu(old, rcu_head);
3075         spin_unlock_bh(&sta->lock);
3076 }
3077 
3078 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
3079 {
3080         struct sta_info *sta;
3081 
3082         rcu_read_lock();
3083         list_for_each_entry_rcu(sta, &local->sta_list, list)
3084                 ieee80211_check_fast_xmit(sta);
3085         rcu_read_unlock();
3086 }
3087 
3088 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
3089 {
3090         struct ieee80211_local *local = sdata->local;
3091         struct sta_info *sta;
3092 
3093         rcu_read_lock();
3094 
3095         list_for_each_entry_rcu(sta, &local->sta_list, list) {
3096                 if (sdata != sta->sdata &&
3097                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3098                         continue;
3099                 ieee80211_check_fast_xmit(sta);
3100         }
3101 
3102         rcu_read_unlock();
3103 }
3104 
3105 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3106 {
3107         struct ieee80211_fast_tx *fast_tx;
3108 
3109         spin_lock_bh(&sta->lock);
3110         fast_tx = rcu_dereference_protected(sta->fast_tx,
3111                                             lockdep_is_held(&sta->lock));
3112         RCU_INIT_POINTER(sta->fast_tx, NULL);
3113         spin_unlock_bh(&sta->lock);
3114 
3115         if (fast_tx)
3116                 kfree_rcu(fast_tx, rcu_head);
3117 }
3118 
3119 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3120                                         struct sk_buff *skb, int headroom)
3121 {
3122         if (skb_headroom(skb) < headroom) {
3123                 I802_DEBUG_INC(local->tx_expand_skb_head);
3124 
3125                 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
3126                         wiphy_debug(local->hw.wiphy,
3127                                     "failed to reallocate TX buffer\n");
3128                         return false;
3129                 }
3130         }
3131 
3132         return true;
3133 }
3134 
3135 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3136                                          struct ieee80211_fast_tx *fast_tx,
3137                                          struct sk_buff *skb)
3138 {
3139         struct ieee80211_local *local = sdata->local;
3140         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3141         struct ieee80211_hdr *hdr;
3142         struct ethhdr *amsdu_hdr;
3143         int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3144         int subframe_len = skb->len - hdr_len;
3145         void *data;
3146         u8 *qc, *h_80211_src, *h_80211_dst;
3147         const u8 *bssid;
3148 
3149         if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3150                 return false;
3151 
3152         if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3153                 return true;
3154 
3155         if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr)))
3156                 return false;
3157 
3158         data = skb_push(skb, sizeof(*amsdu_hdr));
3159         memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3160         hdr = data;
3161         amsdu_hdr = data + hdr_len;
3162         /* h_80211_src/dst is addr* field within hdr */
3163         h_80211_src = data + fast_tx->sa_offs;
3164         h_80211_dst = data + fast_tx->da_offs;
3165 
3166         amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3167         ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3168         ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3169 
3170         /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3171          * fields needs to be changed to BSSID for A-MSDU frames depending
3172          * on FromDS/ToDS values.
3173          */
3174         switch (sdata->vif.type) {
3175         case NL80211_IFTYPE_STATION:
3176                 bssid = sdata->u.mgd.bssid;
3177                 break;
3178         case NL80211_IFTYPE_AP:
3179         case NL80211_IFTYPE_AP_VLAN:
3180                 bssid = sdata->vif.addr;
3181                 break;
3182         default:
3183                 bssid = NULL;
3184         }
3185 
3186         if (bssid && ieee80211_has_fromds(hdr->frame_control))
3187                 ether_addr_copy(h_80211_src, bssid);
3188 
3189         if (bssid && ieee80211_has_tods(hdr->frame_control))
3190                 ether_addr_copy(h_80211_dst, bssid);
3191 
3192         qc = ieee80211_get_qos_ctl(hdr);
3193         *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3194 
3195         info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3196 
3197         return true;
3198 }
3199 
3200 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3201                                       struct sta_info *sta,
3202                                       struct ieee80211_fast_tx *fast_tx,
3203                                       struct sk_buff *skb)
3204 {
3205         struct ieee80211_local *local = sdata->local;
3206         struct fq *fq = &local->fq;
3207         struct fq_tin *tin;
3208         struct fq_flow *flow;
3209         u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3210         struct ieee80211_txq *txq = sta->sta.txq[tid];
3211         struct txq_info *txqi;
3212         struct sk_buff **frag_tail, *head;
3213         int subframe_len = skb->len - ETH_ALEN;
3214         u8 max_subframes = sta->sta.max_amsdu_subframes;
3215         int max_frags = local->hw.max_tx_fragments;
3216         int max_amsdu_len = sta->sta.max_amsdu_len;
3217         int orig_truesize;
3218         __be16 len;
3219         void *data;
3220         bool ret = false;
3221         unsigned int orig_len;
3222         int n = 2, nfrags, pad = 0;
3223         u16 hdrlen;
3224 
3225         if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3226                 return false;
3227 
3228         if (skb_is_gso(skb))
3229                 return false;
3230 
3231         if (!txq)
3232                 return false;
3233 
3234         txqi = to_txq_info(txq);
3235         if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3236                 return false;
3237 
3238         if (sta->sta.max_rc_amsdu_len)
3239                 max_amsdu_len = min_t(int, max_amsdu_len,
3240                                       sta->sta.max_rc_amsdu_len);
3241 
3242         if (sta->sta.max_tid_amsdu_len[tid])
3243                 max_amsdu_len = min_t(int, max_amsdu_len,
3244                                       sta->sta.max_tid_amsdu_len[tid]);
3245 
3246         spin_lock_bh(&fq->lock);
3247 
3248         /* TODO: Ideally aggregation should be done on dequeue to remain
3249          * responsive to environment changes.
3250          */
3251 
3252         tin = &txqi->tin;
3253         flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3254         head = skb_peek_tail(&flow->queue);
3255         if (!head || skb_is_gso(head))
3256                 goto out;
3257 
3258         orig_truesize = head->truesize;
3259         orig_len = head->len;
3260 
3261         if (skb->len + head->len > max_amsdu_len)
3262                 goto out;
3263 
3264         nfrags = 1 + skb_shinfo(skb)->nr_frags;
3265         nfrags += 1 + skb_shinfo(head)->nr_frags;
3266         frag_tail = &skb_shinfo(head)->frag_list;
3267         while (*frag_tail) {
3268                 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3269                 frag_tail = &(*frag_tail)->next;
3270                 n++;
3271         }
3272 
3273         if (max_subframes && n > max_subframes)
3274                 goto out;
3275 
3276         if (max_frags && nfrags > max_frags)
3277                 goto out;
3278 
3279         if (!drv_can_aggregate_in_amsdu(local, head, skb))
3280                 goto out;
3281 
3282         if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3283                 goto out;
3284 
3285         /*
3286          * Pad out the previous subframe to a multiple of 4 by adding the
3287          * padding to the next one, that's being added. Note that head->len
3288          * is the length of the full A-MSDU, but that works since each time
3289          * we add a new subframe we pad out the previous one to a multiple
3290          * of 4 and thus it no longer matters in the next round.
3291          */
3292         hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header);
3293         if ((head->len - hdrlen) & 3)
3294                 pad = 4 - ((head->len - hdrlen) & 3);
3295 
3296         if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) +
3297                                                      2 + pad))
3298                 goto out_recalc;
3299 
3300         ret = true;
3301         data = skb_push(skb, ETH_ALEN + 2);
3302         memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3303 
3304         data += 2 * ETH_ALEN;
3305         len = cpu_to_be16(subframe_len);
3306         memcpy(data, &len, 2);
3307         memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3308 
3309         memset(skb_push(skb, pad), 0, pad);
3310 
3311         head->len += skb->len;
3312         head->data_len += skb->len;
3313         *frag_tail = skb;
3314 
3315 out_recalc:
3316         fq->memory_usage += head->truesize - orig_truesize;
3317         if (head->len != orig_len) {
3318                 flow->backlog += head->len - orig_len;
3319                 tin->backlog_bytes += head->len - orig_len;
3320 
3321                 fq_recalc_backlog(fq, tin, flow);
3322         }
3323 out:
3324         spin_unlock_bh(&fq->lock);
3325 
3326         return ret;
3327 }
3328 
3329 /*
3330  * Can be called while the sta lock is held. Anything that can cause packets to
3331  * be generated will cause deadlock!
3332  */
3333 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3334                                        struct sta_info *sta, u8 pn_offs,
3335                                        struct ieee80211_key *key,
3336                                        struct sk_buff *skb)
3337 {
3338         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3339         struct ieee80211_hdr *hdr = (void *)skb->data;
3340         u8 tid = IEEE80211_NUM_TIDS;
3341 
3342         if (key)
3343                 info->control.hw_key = &key->conf;
3344 
3345         ieee80211_tx_stats(skb->dev, skb->len);
3346 
3347         if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3348                 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3349                 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3350         } else {
3351                 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3352                 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3353                 sdata->sequence_number += 0x10;
3354         }
3355 
3356         if (skb_shinfo(skb)->gso_size)
3357                 sta->tx_stats.msdu[tid] +=
3358                         DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3359         else
3360                 sta->tx_stats.msdu[tid]++;
3361 
3362         info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3363 
3364         /* statistics normally done by ieee80211_tx_h_stats (but that
3365          * has to consider fragmentation, so is more complex)
3366          */
3367         sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3368         sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3369 
3370         if (pn_offs) {
3371                 u64 pn;
3372                 u8 *crypto_hdr = skb->data + pn_offs;
3373 
3374                 switch (key->conf.cipher) {
3375                 case WLAN_CIPHER_SUITE_CCMP:
3376                 case WLAN_CIPHER_SUITE_CCMP_256:
3377                 case WLAN_CIPHER_SUITE_GCMP:
3378                 case WLAN_CIPHER_SUITE_GCMP_256:
3379                         pn = atomic64_inc_return(&key->conf.tx_pn);
3380                         crypto_hdr[0] = pn;
3381                         crypto_hdr[1] = pn >> 8;
3382                         crypto_hdr[4] = pn >> 16;
3383                         crypto_hdr[5] = pn >> 24;
3384                         crypto_hdr[6] = pn >> 32;
3385                         crypto_hdr[7] = pn >> 40;
3386                         break;
3387                 }
3388         }
3389 }
3390 
3391 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3392                                 struct sta_info *sta,
3393                                 struct ieee80211_fast_tx *fast_tx,
3394                                 struct sk_buff *skb)
3395 {
3396         struct ieee80211_local *local = sdata->local;
3397         u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3398         int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3399         int hw_headroom = sdata->local->hw.extra_tx_headroom;
3400         struct ethhdr eth;
3401         struct ieee80211_tx_info *info;
3402         struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3403         struct ieee80211_tx_data tx;
3404         ieee80211_tx_result r;
3405         struct tid_ampdu_tx *tid_tx = NULL;
3406         u8 tid = IEEE80211_NUM_TIDS;
3407 
3408         /* control port protocol needs a lot of special handling */
3409         if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3410                 return false;
3411 
3412         /* only RFC 1042 SNAP */
3413         if (ethertype < ETH_P_802_3_MIN)
3414                 return false;
3415 
3416         /* don't handle TX status request here either */
3417         if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3418                 return false;
3419 
3420         if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3421                 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3422                 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3423                 if (tid_tx) {
3424                         if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3425                                 return false;
3426                         if (tid_tx->timeout)
3427                                 tid_tx->last_tx = jiffies;
3428                 }
3429         }
3430 
3431         /* after this point (skb is modified) we cannot return false */
3432 
3433         if (skb_shared(skb)) {
3434                 struct sk_buff *tmp_skb = skb;
3435 
3436                 skb = skb_clone(skb, GFP_ATOMIC);
3437                 kfree_skb(tmp_skb);
3438 
3439                 if (!skb)
3440                         return true;
3441         }
3442 
3443         if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3444             ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3445                 return true;
3446 
3447         /* will not be crypto-handled beyond what we do here, so use false
3448          * as the may-encrypt argument for the resize to not account for
3449          * more room than we already have in 'extra_head'
3450          */
3451         if (unlikely(ieee80211_skb_resize(sdata, skb,
3452                                           max_t(int, extra_head + hw_headroom -
3453                                                      skb_headroom(skb), 0),
3454                                           false))) {
3455                 kfree_skb(skb);
3456                 return true;
3457         }
3458 
3459         memcpy(&eth, skb->data, ETH_HLEN - 2);
3460         hdr = skb_push(skb, extra_head);
3461         memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3462         memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3463         memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3464 
3465         info = IEEE80211_SKB_CB(skb);
3466         memset(info, 0, sizeof(*info));
3467         info->band = fast_tx->band;
3468         info->control.vif = &sdata->vif;
3469         info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3470                       IEEE80211_TX_CTL_DONTFRAG |
3471                       (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3472         info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3473 
3474         if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3475                 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3476                 *ieee80211_get_qos_ctl(hdr) = tid;
3477         }
3478 
3479         __skb_queue_head_init(&tx.skbs);
3480 
3481         tx.flags = IEEE80211_TX_UNICAST;
3482         tx.local = local;
3483         tx.sdata = sdata;
3484         tx.sta = sta;
3485         tx.key = fast_tx->key;
3486 
3487         if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3488                 tx.skb = skb;
3489                 r = ieee80211_tx_h_rate_ctrl(&tx);
3490                 skb = tx.skb;
3491                 tx.skb = NULL;
3492 
3493                 if (r != TX_CONTINUE) {
3494                         if (r != TX_QUEUED)
3495                                 kfree_skb(skb);
3496                         return true;
3497                 }
3498         }
3499 
3500         if (ieee80211_queue_skb(local, sdata, sta, skb))
3501                 return true;
3502 
3503         ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3504                                    fast_tx->key, skb);
3505 
3506         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3507                 sdata = container_of(sdata->bss,
3508                                      struct ieee80211_sub_if_data, u.ap);
3509 
3510         __skb_queue_tail(&tx.skbs, skb);
3511         ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3512         return true;
3513 }
3514 
3515 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3516                                      struct ieee80211_txq *txq)
3517 {
3518         struct ieee80211_local *local = hw_to_local(hw);
3519         struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3520         struct ieee80211_hdr *hdr;
3521         struct sk_buff *skb = NULL;
3522         struct fq *fq = &local->fq;
3523         struct fq_tin *tin = &txqi->tin;
3524         struct ieee80211_tx_info *info;
3525         struct ieee80211_tx_data tx;
3526         ieee80211_tx_result r;
3527         struct ieee80211_vif *vif = txq->vif;
3528 
3529         spin_lock_bh(&fq->lock);
3530 
3531         if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) ||
3532             test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags))
3533                 goto out;
3534 
3535         if (vif->txqs_stopped[ieee80211_ac_from_tid(txq->tid)]) {
3536                 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags);
3537                 goto out;
3538         }
3539 
3540         /* Make sure fragments stay together. */
3541         skb = __skb_dequeue(&txqi->frags);
3542         if (skb)
3543                 goto out;
3544 
3545 begin:
3546         skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3547         if (!skb)
3548                 goto out;
3549 
3550         hdr = (struct ieee80211_hdr *)skb->data;
3551         info = IEEE80211_SKB_CB(skb);
3552 
3553         memset(&tx, 0, sizeof(tx));
3554         __skb_queue_head_init(&tx.skbs);
3555         tx.local = local;
3556         tx.skb = skb;
3557         tx.sdata = vif_to_sdata(info->control.vif);
3558 
3559         if (txq->sta)
3560                 tx.sta = container_of(txq->sta, struct sta_info, sta);
3561 
3562         /*
3563          * The key can be removed while the packet was queued, so need to call
3564          * this here to get the current key.
3565          */
3566         r = ieee80211_tx_h_select_key(&tx);
3567         if (r != TX_CONTINUE) {
3568                 ieee80211_free_txskb(&local->hw, skb);
3569                 goto begin;
3570         }
3571 
3572         if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3573                 info->flags |= IEEE80211_TX_CTL_AMPDU;
3574         else
3575                 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3576 
3577         if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3578                 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3579                                                     sta);
3580                 u8 pn_offs = 0;
3581 
3582                 if (tx.key &&
3583                     (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3584                         pn_offs = ieee80211_hdrlen(hdr->frame_control);
3585 
3586                 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3587                                            tx.key, skb);
3588         } else {
3589                 if (invoke_tx_handlers_late(&tx))
3590                         goto begin;
3591 
3592                 skb = __skb_dequeue(&tx.skbs);
3593 
3594                 if (!skb_queue_empty(&tx.skbs))
3595                         skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3596         }
3597 
3598         if (skb_has_frag_list(skb) &&
3599             !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3600                 if (skb_linearize(skb)) {
3601                         ieee80211_free_txskb(&local->hw, skb);
3602                         goto begin;
3603                 }
3604         }
3605 
3606         switch (tx.sdata->vif.type) {
3607         case NL80211_IFTYPE_MONITOR:
3608                 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
3609                         vif = &tx.sdata->vif;
3610                         break;
3611                 }
3612                 tx.sdata = rcu_dereference(local->monitor_sdata);
3613                 if (tx.sdata) {
3614                         vif = &tx.sdata->vif;
3615                         info->hw_queue =
3616                                 vif->hw_queue[skb_get_queue_mapping(skb)];
3617                 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
3618                         ieee80211_free_txskb(&local->hw, skb);
3619                         goto begin;
3620                 } else {
3621                         vif = NULL;
3622                 }
3623                 break;
3624         case NL80211_IFTYPE_AP_VLAN:
3625                 tx.sdata = container_of(tx.sdata->bss,
3626                                         struct ieee80211_sub_if_data, u.ap);
3627                 /* fall through */
3628         default:
3629                 vif = &tx.sdata->vif;
3630                 break;
3631         }
3632 
3633         IEEE80211_SKB_CB(skb)->control.vif = vif;
3634 
3635 out:
3636         spin_unlock_bh(&fq->lock);
3637 
3638         return skb;
3639 }
3640 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3641 
3642 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3643                                   struct net_device *dev,
3644                                   u32 info_flags)
3645 {
3646         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3647         struct sta_info *sta;
3648         struct sk_buff *next;
3649 
3650         if (unlikely(skb->len < ETH_HLEN)) {
3651                 kfree_skb(skb);
3652                 return;
3653         }
3654 
3655         rcu_read_lock();
3656 
3657         if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3658                 goto out_free;
3659 
3660         if (!IS_ERR_OR_NULL(sta)) {
3661                 struct ieee80211_fast_tx *fast_tx;
3662 
3663                 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift);
3664 
3665                 fast_tx = rcu_dereference(sta->fast_tx);
3666 
3667                 if (fast_tx &&
3668                     ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
3669                         goto out;
3670         }
3671 
3672         if (skb_is_gso(skb)) {
3673                 struct sk_buff *segs;
3674 
3675                 segs = skb_gso_segment(skb, 0);
3676                 if (IS_ERR(segs)) {
3677                         goto out_free;
3678                 } else if (segs) {
3679                         consume_skb(skb);
3680                         skb = segs;
3681                 }
3682         } else {
3683                 /* we cannot process non-linear frames on this path */
3684                 if (skb_linearize(skb)) {
3685                         kfree_skb(skb);
3686                         goto out;
3687                 }
3688 
3689                 /* the frame could be fragmented, software-encrypted, and other
3690                  * things so we cannot really handle checksum offload with it -
3691                  * fix it up in software before we handle anything else.
3692                  */
3693                 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3694                         skb_set_transport_header(skb,
3695                                                  skb_checksum_start_offset(skb));
3696                         if (skb_checksum_help(skb))
3697                                 goto out_free;
3698                 }
3699         }
3700 
3701         next = skb;
3702         while (next) {
3703                 skb = next;
3704                 next = skb->next;
3705 
3706                 skb->prev = NULL;
3707                 skb->next = NULL;
3708 
3709                 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3710                 if (IS_ERR(skb))
3711                         goto out;
3712 
3713                 ieee80211_tx_stats(dev, skb->len);
3714 
3715                 ieee80211_xmit(sdata, sta, skb, 0);
3716         }
3717         goto out;
3718  out_free:
3719         kfree_skb(skb);
3720  out:
3721         rcu_read_unlock();
3722 }
3723 
3724 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
3725 {
3726         struct ethhdr *eth;
3727         int err;
3728 
3729         err = skb_ensure_writable(skb, ETH_HLEN);
3730         if (unlikely(err))
3731                 return err;
3732 
3733         eth = (void *)skb->data;
3734         ether_addr_copy(eth->h_dest, sta->sta.addr);
3735 
3736         return 0;
3737 }
3738 
3739 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
3740                                            struct net_device *dev)
3741 {
3742         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3743         const struct ethhdr *eth = (void *)skb->data;
3744         const struct vlan_ethhdr *ethvlan = (void *)skb->data;
3745         __be16 ethertype;
3746 
3747         if (likely(!is_multicast_ether_addr(eth->h_dest)))
3748                 return false;
3749 
3750         switch (sdata->vif.type) {
3751         case NL80211_IFTYPE_AP_VLAN:
3752                 if (sdata->u.vlan.sta)
3753                         return false;
3754                 if (sdata->wdev.use_4addr)
3755                         return false;
3756                 /* fall through */
3757         case NL80211_IFTYPE_AP:
3758                 /* check runtime toggle for this bss */
3759                 if (!sdata->bss->multicast_to_unicast)
3760                         return false;
3761                 break;
3762         default:
3763                 return false;
3764         }
3765 
3766         /* multicast to unicast conversion only for some payload */
3767         ethertype = eth->h_proto;
3768         if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
3769                 ethertype = ethvlan->h_vlan_encapsulated_proto;
3770         switch (ethertype) {
3771         case htons(ETH_P_ARP):
3772         case htons(ETH_P_IP):
3773         case htons(ETH_P_IPV6):
3774                 break;
3775         default:
3776                 return false;
3777         }
3778 
3779         return true;
3780 }
3781 
3782 static void
3783 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
3784                              struct sk_buff_head *queue)
3785 {
3786         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3787         struct ieee80211_local *local = sdata->local;
3788         const struct ethhdr *eth = (struct ethhdr *)skb->data;
3789         struct sta_info *sta, *first = NULL;
3790         struct sk_buff *cloned_skb;
3791 
3792         rcu_read_lock();
3793 
3794         list_for_each_entry_rcu(sta, &local->sta_list, list) {
3795                 if (sdata != sta->sdata)
3796                         /* AP-VLAN mismatch */
3797                         continue;
3798                 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
3799                         /* do not send back to source */
3800                         continue;
3801                 if (!first) {
3802                         first = sta;
3803                         continue;
3804                 }
3805                 cloned_skb = skb_clone(skb, GFP_ATOMIC);
3806                 if (!cloned_skb)
3807                         goto multicast;
3808                 if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
3809                         dev_kfree_skb(cloned_skb);
3810                         goto multicast;
3811                 }
3812                 __skb_queue_tail(queue, cloned_skb);
3813         }
3814 
3815         if (likely(first)) {
3816                 if (unlikely(ieee80211_change_da(skb, first)))
3817                         goto multicast;
3818                 __skb_queue_tail(queue, skb);
3819         } else {
3820                 /* no STA connected, drop */
3821                 kfree_skb(skb);
3822                 skb = NULL;
3823         }
3824 
3825         goto out;
3826 multicast:
3827         __skb_queue_purge(queue);
3828         __skb_queue_tail(queue, skb);
3829 out:
3830         rcu_read_unlock();
3831 }
3832 
3833 /**
3834  * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3835  * @skb: packet to be sent
3836  * @dev: incoming interface
3837  *
3838  * On failure skb will be freed.
3839  */
3840 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3841                                        struct net_device *dev)
3842 {
3843         if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
3844                 struct sk_buff_head queue;
3845 
3846                 __skb_queue_head_init(&queue);
3847                 ieee80211_convert_to_unicast(skb, dev, &queue);
3848                 while ((skb = __skb_dequeue(&queue)))
3849                         __ieee80211_subif_start_xmit(skb, dev, 0);
3850         } else {
3851                 __ieee80211_subif_start_xmit(skb, dev, 0);
3852         }
3853 
3854         return NETDEV_TX_OK;
3855 }
3856 
3857 struct sk_buff *
3858 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3859                               struct sk_buff *skb, u32 info_flags)
3860 {
3861         struct ieee80211_hdr *hdr;
3862         struct ieee80211_tx_data tx = {
3863                 .local = sdata->local,
3864                 .sdata = sdata,
3865         };
3866         struct sta_info *sta;
3867 
3868         rcu_read_lock();
3869 
3870         if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3871                 kfree_skb(skb);
3872                 skb = ERR_PTR(-EINVAL);
3873                 goto out;
3874         }
3875 
3876         skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3877         if (IS_ERR(skb))
3878                 goto out;
3879 
3880         hdr = (void *)skb->data;
3881         tx.sta = sta_info_get(sdata, hdr->addr1);
3882         tx.skb = skb;
3883 
3884         if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3885                 rcu_read_unlock();
3886                 kfree_skb(skb);
3887                 return ERR_PTR(-EINVAL);
3888         }
3889 
3890 out:
3891         rcu_read_unlock();
3892         return skb;
3893 }
3894 
3895 /*
3896  * ieee80211_clear_tx_pending may not be called in a context where
3897  * it is possible that it packets could come in again.
3898  */
3899 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3900 {
3901         struct sk_buff *skb;
3902         int i;
3903 
3904         for (i = 0; i < local->hw.queues; i++) {
3905                 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3906                         ieee80211_free_txskb(&local->hw, skb);
3907         }
3908 }
3909 
3910 /*
3911  * Returns false if the frame couldn't be transmitted but was queued instead,
3912  * which in this case means re-queued -- take as an indication to stop sending
3913  * more pending frames.
3914  */
3915 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3916                                      struct sk_buff *skb)
3917 {
3918         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3919         struct ieee80211_sub_if_data *sdata;
3920         struct sta_info *sta;
3921         struct ieee80211_hdr *hdr;
3922         bool result;
3923         struct ieee80211_chanctx_conf *chanctx_conf;
3924 
3925         sdata = vif_to_sdata(info->control.vif);
3926 
3927         if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3928                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3929                 if (unlikely(!chanctx_conf)) {
3930                         dev_kfree_skb(skb);
3931                         return true;
3932                 }
3933                 info->band = chanctx_conf->def.chan->band;
3934                 result = ieee80211_tx(sdata, NULL, skb, true, 0);
3935         } else {
3936                 struct sk_buff_head skbs;
3937 
3938                 __skb_queue_head_init(&skbs);
3939                 __skb_queue_tail(&skbs, skb);
3940 
3941                 hdr = (struct ieee80211_hdr *)skb->data;
3942                 sta = sta_info_get(sdata, hdr->addr1);
3943 
3944                 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3945         }
3946 
3947         return result;
3948 }
3949 
3950 /*
3951  * Transmit all pending packets. Called from tasklet.
3952  */
3953 void ieee80211_tx_pending(unsigned long data)
3954 {
3955         struct ieee80211_local *local = (struct ieee80211_local *)data;
3956         unsigned long flags;
3957         int i;
3958         bool txok;
3959 
3960         rcu_read_lock();
3961 
3962         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3963         for (i = 0; i < local->hw.queues; i++) {
3964                 /*
3965                  * If queue is stopped by something other than due to pending
3966                  * frames, or we have no pending frames, proceed to next queue.
3967                  */
3968                 if (local->queue_stop_reasons[i] ||
3969                     skb_queue_empty(&local->pending[i]))
3970                         continue;
3971 
3972                 while (!skb_queue_empty(&local->pending[i])) {
3973                         struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3974                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3975 
3976                         if (WARN_ON(!info->control.vif)) {
3977                                 ieee80211_free_txskb(&local->hw, skb);
3978                                 continue;
3979                         }
3980 
3981                         spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3982                                                 flags);
3983 
3984                         txok = ieee80211_tx_pending_skb(local, skb);
3985                         spin_lock_irqsave(&local->queue_stop_reason_lock,
3986                                           flags);
3987                         if (!txok)
3988                                 break;
3989                 }
3990 
3991                 if (skb_queue_empty(&local->pending[i]))
3992                         ieee80211_propagate_queue_wake(local, i);
3993         }
3994         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3995 
3996         rcu_read_unlock();
3997 }
3998 
3999 /* functions for drivers to get certain frames */
4000 
4001 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4002                                        struct ps_data *ps, struct sk_buff *skb,
4003                                        bool is_template)
4004 {
4005         u8 *pos, *tim;
4006         int aid0 = 0;
4007         int i, have_bits = 0, n1, n2;
4008 
4009         /* Generate bitmap for TIM only if there are any STAs in power save
4010          * mode. */
4011         if (atomic_read(&ps->num_sta_ps) > 0)
4012                 /* in the hope that this is faster than
4013                  * checking byte-for-byte */
4014                 have_bits = !bitmap_empty((unsigned long *)ps->tim,
4015                                           IEEE80211_MAX_AID+1);
4016         if (!is_template) {
4017                 if (ps->dtim_count == 0)
4018                         ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
4019                 else
4020                         ps->dtim_count--;
4021         }
4022 
4023         tim = pos = skb_put(skb, 6);
4024         *pos++ = WLAN_EID_TIM;
4025         *pos++ = 4;
4026         *pos++ = ps->dtim_count;
4027         *pos++ = sdata->vif.bss_conf.dtim_period;
4028 
4029         if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
4030                 aid0 = 1;
4031 
4032         ps->dtim_bc_mc = aid0 == 1;
4033 
4034         if (have_bits) {
4035                 /* Find largest even number N1 so that bits numbered 1 through
4036                  * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
4037                  * (N2 + 1) x 8 through 2007 are 0. */
4038                 n1 = 0;
4039                 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
4040                         if (ps->tim[i]) {
4041                                 n1 = i & 0xfe;
4042                                 break;
4043                         }
4044                 }
4045                 n2 = n1;
4046                 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
4047                         if (ps->tim[i]) {
4048                                 n2 = i;
4049                                 break;
4050                         }
4051                 }
4052 
4053                 /* Bitmap control */
4054                 *pos++ = n1 | aid0;
4055                 /* Part Virt Bitmap */
4056                 skb_put(skb, n2 - n1);
4057                 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
4058 
4059                 tim[1] = n2 - n1 + 4;
4060         } else {
4061                 *pos++ = aid0; /* Bitmap control */
4062                 *pos++ = 0; /* Part Virt Bitmap */
4063         }
4064 }
4065 
4066 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4067                                     struct ps_data *ps, struct sk_buff *skb,
4068                                     bool is_template)
4069 {
4070         struct ieee80211_local *local = sdata->local;
4071 
4072         /*
4073          * Not very nice, but we want to allow the driver to call
4074          * ieee80211_beacon_get() as a response to the set_tim()
4075          * callback. That, however, is already invoked under the
4076          * sta_lock to guarantee consistent and race-free update
4077          * of the tim bitmap in mac80211 and the driver.
4078          */
4079         if (local->tim_in_locked_section) {
4080                 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4081         } else {
4082                 spin_lock_bh(&local->tim_lock);
4083                 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4084                 spin_unlock_bh(&local->tim_lock);
4085         }
4086 
4087         return 0;
4088 }
4089 
4090 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
4091                               struct beacon_data *beacon)
4092 {
4093         struct probe_resp *resp;
4094         u8 *beacon_data;
4095         size_t beacon_data_len;
4096         int i;
4097         u8 count = beacon->csa_current_counter;
4098 
4099         switch (sdata->vif.type) {
4100         case NL80211_IFTYPE_AP:
4101                 beacon_data = beacon->tail;
4102                 beacon_data_len = beacon->tail_len;
4103                 break;
4104         case NL80211_IFTYPE_ADHOC:
4105                 beacon_data = beacon->head;
4106                 beacon_data_len = beacon->head_len;
4107                 break;
4108         case NL80211_IFTYPE_MESH_POINT:
4109                 beacon_data = beacon->head;
4110                 beacon_data_len = beacon->head_len;
4111                 break;
4112         default:
4113                 return;
4114         }
4115 
4116         rcu_read_lock();
4117         for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
4118                 resp = rcu_dereference(sdata->u.ap.probe_resp);
4119 
4120                 if (beacon->csa_counter_offsets[i]) {
4121                         if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
4122                                          beacon_data_len)) {
4123                                 rcu_read_unlock();
4124                                 return;
4125                         }
4126 
4127                         beacon_data[beacon->csa_counter_offsets[i]] = count;
4128                 }
4129 
4130                 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
4131                         resp->data[resp->csa_counter_offsets[i]] = count;
4132         }
4133         rcu_read_unlock();
4134 }
4135 
4136 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
4137 {
4138         beacon->csa_current_counter--;
4139 
4140         /* the counter should never reach 0 */
4141         WARN_ON_ONCE(!beacon->csa_current_counter);
4142 
4143         return beacon->csa_current_counter;
4144 }
4145 
4146 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
4147 {
4148         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4149         struct beacon_data *beacon = NULL;
4150         u8 count = 0;
4151 
4152         rcu_read_lock();
4153 
4154         if (sdata->vif.type == NL80211_IFTYPE_AP)
4155                 beacon = rcu_dereference(sdata->u.ap.beacon);
4156         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4157                 beacon = rcu_dereference(sdata->u.ibss.presp);
4158         else if (ieee80211_vif_is_mesh(&sdata->vif))
4159                 beacon = rcu_dereference(sdata->u.mesh.beacon);
4160 
4161         if (!beacon)
4162                 goto unlock;
4163 
4164         count = __ieee80211_csa_update_counter(beacon);
4165 
4166 unlock:
4167         rcu_read_unlock();
4168         return count;
4169 }
4170 EXPORT_SYMBOL(ieee80211_csa_update_counter);
4171 
4172 void ieee80211_csa_set_counter(struct ieee80211_vif *vif, u8 counter)
4173 {
4174         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4175         struct beacon_data *beacon = NULL;
4176 
4177         rcu_read_lock();
4178 
4179         if (sdata->vif.type == NL80211_IFTYPE_AP)
4180                 beacon = rcu_dereference(sdata->u.ap.beacon);
4181         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4182                 beacon = rcu_dereference(sdata->u.ibss.presp);
4183         else if (ieee80211_vif_is_mesh(&sdata->vif))
4184                 beacon = rcu_dereference(sdata->u.mesh.beacon);
4185 
4186         if (!beacon)
4187                 goto unlock;
4188 
4189         if (counter < beacon->csa_current_counter)
4190                 beacon->csa_current_counter = counter;
4191 
4192 unlock:
4193         rcu_read_unlock();
4194 }
4195 EXPORT_SYMBOL(ieee80211_csa_set_counter);
4196 
4197 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
4198 {
4199         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4200         struct beacon_data *beacon = NULL;
4201         u8 *beacon_data;
4202         size_t beacon_data_len;
4203         int ret = false;
4204 
4205         if (!ieee80211_sdata_running(sdata))
4206                 return false;
4207 
4208         rcu_read_lock();
4209         if (vif->type == NL80211_IFTYPE_AP) {
4210                 struct ieee80211_if_ap *ap = &sdata->u.ap;
4211 
4212                 beacon = rcu_dereference(ap->beacon);
4213                 if (WARN_ON(!beacon || !beacon->tail))
4214                         goto out;
4215                 beacon_data = beacon->tail;
4216                 beacon_data_len = beacon->tail_len;
4217         } else if (vif->type == NL80211_IFTYPE_ADHOC) {
4218                 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4219 
4220                 beacon = rcu_dereference(ifibss->presp);
4221                 if (!beacon)
4222                         goto out;
4223 
4224                 beacon_data = beacon->head;
4225                 beacon_data_len = beacon->head_len;
4226         } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
4227                 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4228 
4229                 beacon = rcu_dereference(ifmsh->beacon);
4230                 if (!beacon)
4231                         goto out;
4232 
4233                 beacon_data = beacon->head;
4234                 beacon_data_len = beacon->head_len;
4235         } else {
4236                 WARN_ON(1);
4237                 goto out;
4238         }
4239 
4240         if (!beacon->csa_counter_offsets[0])
4241                 goto out;
4242 
4243         if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
4244                 goto out;
4245 
4246         if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
4247                 ret = true;
4248  out:
4249         rcu_read_unlock();
4250 
4251         return ret;
4252 }
4253 EXPORT_SYMBOL(ieee80211_csa_is_complete);
4254 
4255 static struct sk_buff *
4256 __ieee80211_beacon_get(struct ieee80211_hw *hw,
4257                        struct ieee80211_vif *vif,
4258                        struct ieee80211_mutable_offsets *offs,
4259                        bool is_template)
4260 {
4261         struct ieee80211_local *local = hw_to_local(hw);
4262         struct beacon_data *beacon = NULL;
4263         struct sk_buff *skb = NULL;
4264         struct ieee80211_tx_info *info;
4265         struct ieee80211_sub_if_data *sdata = NULL;
4266         enum nl80211_band band;
4267         struct ieee80211_tx_rate_control txrc;
4268         struct ieee80211_chanctx_conf *chanctx_conf;
4269         int csa_off_base = 0;
4270 
4271         rcu_read_lock();
4272 
4273         sdata = vif_to_sdata(vif);
4274         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4275 
4276         if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
4277                 goto out;
4278 
4279         if (offs)
4280                 memset(offs, 0, sizeof(*offs));
4281 
4282         if (sdata->vif.type == NL80211_IFTYPE_AP) {
4283                 struct ieee80211_if_ap *ap = &sdata->u.ap;
4284 
4285                 beacon = rcu_dereference(ap->beacon);
4286                 if (beacon) {
4287                         if (beacon->csa_counter_offsets[0]) {
4288                                 if (!is_template)
4289                                         __ieee80211_csa_update_counter(beacon);
4290 
4291                                 ieee80211_set_csa(sdata, beacon);
4292                         }
4293 
4294                         /*
4295                          * headroom, head length,
4296                          * tail length and maximum TIM length
4297                          */
4298                         skb = dev_alloc_skb(local->tx_headroom +
4299                                             beacon->head_len +
4300                                             beacon->tail_len + 256 +
4301                                             local->hw.extra_beacon_tailroom);
4302                         if (!skb)
4303                                 goto out;
4304 
4305                         skb_reserve(skb, local->tx_headroom);
4306                         skb_put_data(skb, beacon->head, beacon->head_len);
4307 
4308                         ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4309                                                  is_template);
4310 
4311                         if (offs) {
4312                                 offs->tim_offset = beacon->head_len;
4313                                 offs->tim_length = skb->len - beacon->head_len;
4314 
4315                                 /* for AP the csa offsets are from tail */
4316                                 csa_off_base = skb->len;
4317                         }
4318 
4319                         if (beacon->tail)
4320                                 skb_put_data(skb, beacon->tail,
4321                                              beacon->tail_len);
4322                 } else
4323                         goto out;
4324         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
4325                 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4326                 struct ieee80211_hdr *hdr;
4327 
4328                 beacon = rcu_dereference(ifibss->presp);
4329                 if (!beacon)
4330                         goto out;
4331 
4332                 if (beacon->csa_counter_offsets[0]) {
4333                         if (!is_template)
4334                                 __ieee80211_csa_update_counter(beacon);
4335 
4336                         ieee80211_set_csa(sdata, beacon);
4337                 }
4338 
4339                 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
4340                                     local->hw.extra_beacon_tailroom);
4341                 if (!skb)
4342                         goto out;
4343                 skb_reserve(skb, local->tx_headroom);
4344                 skb_put_data(skb, beacon->head, beacon->head_len);
4345 
4346                 hdr = (struct ieee80211_hdr *) skb->data;
4347                 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4348                                                  IEEE80211_STYPE_BEACON);
4349         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4350                 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4351 
4352                 beacon = rcu_dereference(ifmsh->beacon);
4353                 if (!beacon)
4354                         goto out;
4355 
4356                 if (beacon->csa_counter_offsets[0]) {
4357                         if (!is_template)
4358                                 /* TODO: For mesh csa_counter is in TU, so
4359                                  * decrementing it by one isn't correct, but
4360                                  * for now we leave it consistent with overall
4361                                  * mac80211's behavior.
4362                                  */
4363                                 __ieee80211_csa_update_counter(beacon);
4364 
4365                         ieee80211_set_csa(sdata, beacon);
4366                 }
4367 
4368                 if (ifmsh->sync_ops)
4369                         ifmsh->sync_ops->adjust_tsf(sdata, beacon);
4370 
4371                 skb = dev_alloc_skb(local->tx_headroom +
4372                                     beacon->head_len +
4373                                     256 + /* TIM IE */
4374                                     beacon->tail_len +
4375                                     local->hw.extra_beacon_tailroom);
4376                 if (!skb)
4377                         goto out;
4378                 skb_reserve(skb, local->tx_headroom);
4379                 skb_put_data(skb, beacon->head, beacon->head_len);
4380                 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4381 
4382                 if (offs) {
4383                         offs->tim_offset = beacon->head_len;
4384                         offs->tim_length = skb->len - beacon->head_len;
4385                 }
4386 
4387                 skb_put_data(skb, beacon->tail, beacon->tail_len);
4388         } else {
4389                 WARN_ON(1);
4390                 goto out;
4391         }
4392 
4393         /* CSA offsets */
4394         if (offs && beacon) {
4395                 int i;
4396 
4397                 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
4398                         u16 csa_off = beacon->csa_counter_offsets[i];
4399 
4400                         if (!csa_off)
4401                                 continue;
4402 
4403                         offs->csa_counter_offs[i] = csa_off_base + csa_off;
4404                 }
4405         }
4406 
4407         band = chanctx_conf->def.chan->band;
4408 
4409         info = IEEE80211_SKB_CB(skb);
4410 
4411         info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4412         info->flags |= IEEE80211_TX_CTL_NO_ACK;
4413         info->band = band;
4414 
4415         memset(&txrc, 0, sizeof(txrc));
4416         txrc.hw = hw;
4417         txrc.sband = local->hw.wiphy->bands[band];
4418         txrc.bss_conf = &sdata->vif.bss_conf;
4419         txrc.skb = skb;
4420         txrc.reported_rate.idx = -1;
4421         txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
4422         txrc.bss = true;
4423         rate_control_get_rate(sdata, NULL, &txrc);
4424 
4425         info->control.vif = vif;
4426 
4427         info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4428                         IEEE80211_TX_CTL_ASSIGN_SEQ |
4429                         IEEE80211_TX_CTL_FIRST_FRAGMENT;
4430  out:
4431         rcu_read_unlock();
4432         return skb;
4433 
4434 }
4435 
4436 struct sk_buff *
4437 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4438                               struct ieee80211_vif *vif,
4439                               struct ieee80211_mutable_offsets *offs)
4440 {
4441         return __ieee80211_beacon_get(hw, vif, offs, true);
4442 }
4443 EXPORT_SYMBOL(ieee80211_beacon_get_template);
4444 
4445 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4446                                          struct ieee80211_vif *vif,
4447                                          u16 *tim_offset, u16 *tim_length)
4448 {
4449         struct ieee80211_mutable_offsets offs = {};
4450         struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
4451         struct sk_buff *copy;
4452         struct ieee80211_supported_band *sband;
4453         int shift;
4454 
4455         if (!bcn)
4456                 return bcn;
4457 
4458         if (tim_offset)
4459                 *tim_offset = offs.tim_offset;
4460 
4461         if (tim_length)
4462                 *tim_length = offs.tim_length;
4463 
4464         if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4465             !hw_to_local(hw)->monitors)
4466                 return bcn;
4467 
4468         /* send a copy to monitor interfaces */
4469         copy = skb_copy(bcn, GFP_ATOMIC);
4470         if (!copy)
4471                 return bcn;
4472 
4473         shift = ieee80211_vif_get_shift(vif);
4474         sband = ieee80211_get_sband(vif_to_sdata(vif));
4475         if (!sband)
4476                 return bcn;
4477 
4478         ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4479 
4480         return bcn;
4481 }
4482 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4483 
4484 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4485                                         struct ieee80211_vif *vif)
4486 {
4487         struct ieee80211_if_ap *ap = NULL;
4488         struct sk_buff *skb = NULL;
4489         struct probe_resp *presp = NULL;
4490         struct ieee80211_hdr *hdr;
4491         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4492 
4493         if (sdata->vif.type != NL80211_IFTYPE_AP)
4494                 return NULL;
4495 
4496         rcu_read_lock();
4497 
4498         ap = &sdata->u.ap;
4499         presp = rcu_dereference(ap->probe_resp);
4500         if (!presp)
4501                 goto out;
4502 
4503         skb = dev_alloc_skb(presp->len);
4504         if (!skb)
4505                 goto out;
4506 
4507         skb_put_data(skb, presp->data, presp->len);
4508 
4509         hdr = (struct ieee80211_hdr *) skb->data;
4510         memset(hdr->addr1, 0, sizeof(hdr->addr1));
4511 
4512 out:
4513         rcu_read_unlock();
4514         return skb;
4515 }
4516 EXPORT_SYMBOL(ieee80211_proberesp_get);
4517 
4518 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4519                                      struct ieee80211_vif *vif)
4520 {
4521         struct ieee80211_sub_if_data *sdata;
4522         struct ieee80211_if_managed *ifmgd;
4523         struct ieee80211_pspoll *pspoll;
4524         struct ieee80211_local *local;
4525         struct sk_buff *skb;
4526 
4527         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4528                 return NULL;
4529 
4530         sdata = vif_to_sdata(vif);
4531         ifmgd = &sdata->u.mgd;
4532         local = sdata->local;
4533 
4534         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4535         if (!skb)
4536                 return NULL;
4537 
4538         skb_reserve(skb, local->hw.extra_tx_headroom);
4539 
4540         pspoll = skb_put_zero(skb, sizeof(*pspoll));
4541         pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4542                                             IEEE80211_STYPE_PSPOLL);
4543         pspoll->aid = cpu_to_le16(ifmgd->aid);
4544 
4545         /* aid in PS-Poll has its two MSBs each set to 1 */
4546         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4547 
4548         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4549         memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4550 
4551         return skb;
4552 }
4553 EXPORT_SYMBOL(ieee80211_pspoll_get);
4554 
4555 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4556                                        struct ieee80211_vif *vif,
4557                                        bool qos_ok)
4558 {
4559         struct ieee80211_hdr_3addr *nullfunc;
4560         struct ieee80211_sub_if_data *sdata;
4561         struct ieee80211_if_managed *ifmgd;
4562         struct ieee80211_local *local;
4563         struct sk_buff *skb;
4564         bool qos = false;
4565 
4566         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4567                 return NULL;
4568 
4569         sdata = vif_to_sdata(vif);
4570         ifmgd = &sdata->u.mgd;
4571         local = sdata->local;
4572 
4573         if (qos_ok) {
4574                 struct sta_info *sta;
4575 
4576                 rcu_read_lock();
4577                 sta = sta_info_get(sdata, ifmgd->bssid);
4578                 qos = sta && sta->sta.wme;
4579                 rcu_read_unlock();
4580         }
4581 
4582         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
4583                             sizeof(*nullfunc) + 2);
4584         if (!skb)
4585                 return NULL;
4586 
4587         skb_reserve(skb, local->hw.extra_tx_headroom);
4588 
4589         nullfunc = skb_put_zero(skb, sizeof(*nullfunc));
4590         nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4591                                               IEEE80211_STYPE_NULLFUNC |
4592                                               IEEE80211_FCTL_TODS);
4593         if (qos) {
4594                 __le16 qoshdr = cpu_to_le16(7);
4595 
4596                 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC |
4597                               IEEE80211_STYPE_NULLFUNC) !=
4598                              IEEE80211_STYPE_QOS_NULLFUNC);
4599                 nullfunc->frame_control |=
4600                         cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC);
4601                 skb->priority = 7;
4602                 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
4603                 skb_put_data(skb, &qoshdr, sizeof(qoshdr));
4604         }
4605 
4606         memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4607         memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4608         memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4609 
4610         return skb;
4611 }
4612 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4613 
4614 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4615                                        const u8 *src_addr,
4616                                        const u8 *ssid, size_t ssid_len,
4617                                        size_t tailroom)
4618 {
4619         struct ieee80211_local *local = hw_to_local(hw);
4620         struct ieee80211_hdr_3addr *hdr;
4621         struct sk_buff *skb;
4622         size_t ie_ssid_len;
4623         u8 *pos;
4624 
4625         ie_ssid_len = 2 + ssid_len;
4626 
4627         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4628                             ie_ssid_len + tailroom);
4629         if (!skb)
4630                 return NULL;
4631 
4632         skb_reserve(skb, local->hw.extra_tx_headroom);
4633 
4634         hdr = skb_put_zero(skb, sizeof(*hdr));
4635         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4636                                          IEEE80211_STYPE_PROBE_REQ);
4637         eth_broadcast_addr(hdr->addr1);
4638         memcpy(hdr->addr2, src_addr, ETH_ALEN);
4639         eth_broadcast_addr(hdr->addr3);
4640 
4641         pos = skb_put(skb, ie_ssid_len);
4642         *pos++ = WLAN_EID_SSID;
4643         *pos++ = ssid_len;
4644         if (ssid_len)
4645                 memcpy(pos, ssid, ssid_len);
4646         pos += ssid_len;
4647 
4648         return skb;
4649 }
4650 EXPORT_SYMBOL(ieee80211_probereq_get);
4651 
4652 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4653                        const void *frame, size_t frame_len,
4654                        const struct ieee80211_tx_info *frame_txctl,
4655                        struct ieee80211_rts *rts)
4656 {
4657         const struct ieee80211_hdr *hdr = frame;
4658 
4659         rts->frame_control =
4660             cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4661         rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4662                                                frame_txctl);
4663         memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4664         memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4665 }
4666 EXPORT_SYMBOL(ieee80211_rts_get);
4667 
4668 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4669                              const void *frame, size_t frame_len,
4670                              const struct ieee80211_tx_info *frame_txctl,
4671                              struct ieee80211_cts *cts)
4672 {
4673         const struct ieee80211_hdr *hdr = frame;
4674 
4675         cts->frame_control =
4676             cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4677         cts->duration = ieee80211_ctstoself_duration(hw, vif,
4678                                                      frame_len, frame_txctl);
4679         memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4680 }
4681 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4682 
4683 struct sk_buff *
4684 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4685                           struct ieee80211_vif *vif)
4686 {
4687         struct ieee80211_local *local = hw_to_local(hw);
4688         struct sk_buff *skb = NULL;
4689         struct ieee80211_tx_data tx;
4690         struct ieee80211_sub_if_data *sdata;
4691         struct ps_data *ps;
4692         struct ieee80211_tx_info *info;
4693         struct ieee80211_chanctx_conf *chanctx_conf;
4694 
4695         sdata = vif_to_sdata(vif);
4696 
4697         rcu_read_lock();
4698         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4699 
4700         if (!chanctx_conf)
4701                 goto out;
4702 
4703         if (sdata->vif.type == NL80211_IFTYPE_AP) {
4704                 struct beacon_data *beacon =
4705                                 rcu_dereference(sdata->u.ap.beacon);
4706 
4707                 if (!beacon || !beacon->head)
4708                         goto out;
4709 
4710                 ps = &sdata->u.ap.ps;
4711         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4712                 ps = &sdata->u.mesh.ps;
4713         } else {
4714                 goto out;
4715         }
4716 
4717         if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4718                 goto out; /* send buffered bc/mc only after DTIM beacon */
4719 
4720         while (1) {
4721                 skb = skb_dequeue(&ps->bc_buf);
4722                 if (!skb)
4723                         goto out;
4724                 local->total_ps_buffered--;
4725 
4726                 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4727                         struct ieee80211_hdr *hdr =
4728                                 (struct ieee80211_hdr *) skb->data;
4729                         /* more buffered multicast/broadcast frames ==> set
4730                          * MoreData flag in IEEE 802.11 header to inform PS
4731                          * STAs */
4732                         hdr->frame_control |=
4733                                 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4734                 }
4735 
4736                 if (sdata->vif.type == NL80211_IFTYPE_AP)
4737                         sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4738                 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4739                         break;
4740                 ieee80211_free_txskb(hw, skb);
4741         }
4742 
4743         info = IEEE80211_SKB_CB(skb);
4744 
4745         tx.flags |= IEEE80211_TX_PS_BUFFERED;
4746         info->band = chanctx_conf->def.chan->band;
4747 
4748         if (invoke_tx_handlers(&tx))
4749                 skb = NULL;
4750  out:
4751         rcu_read_unlock();
4752 
4753         return skb;
4754 }
4755 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4756 
4757 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4758 {
4759         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4760         struct ieee80211_sub_if_data *sdata = sta->sdata;
4761         struct ieee80211_local *local = sdata->local;
4762         int ret;
4763         u32 queues;
4764 
4765         lockdep_assert_held(&local->sta_mtx);
4766 
4767         /* only some cases are supported right now */
4768         switch (sdata->vif.type) {
4769         case NL80211_IFTYPE_STATION:
4770         case NL80211_IFTYPE_AP:
4771         case NL80211_IFTYPE_AP_VLAN:
4772                 break;
4773         default:
4774                 WARN_ON(1);
4775                 return -EINVAL;
4776         }
4777 
4778         if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4779                 return -EINVAL;
4780 
4781         if (sta->reserved_tid == tid) {
4782                 ret = 0;
4783                 goto out;
4784         }
4785 
4786         if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4787                 sdata_err(sdata, "TID reservation already active\n");
4788                 ret = -EALREADY;
4789                 goto out;
4790         }
4791 
4792         ieee80211_stop_vif_queues(sdata->local, sdata,
4793                                   IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4794 
4795         synchronize_net();
4796 
4797         /* Tear down BA sessions so we stop aggregating on this TID */
4798         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4799                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4800                 __ieee80211_stop_tx_ba_session(sta, tid,
4801                                                AGG_STOP_LOCAL_REQUEST);
4802         }
4803 
4804         queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4805         __ieee80211_flush_queues(local, sdata, queues, false);
4806 
4807         sta->reserved_tid = tid;
4808 
4809         ieee80211_wake_vif_queues(local, sdata,
4810                                   IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4811 
4812         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4813                 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4814 
4815         ret = 0;
4816  out:
4817         return ret;
4818 }
4819 EXPORT_SYMBOL(ieee80211_reserve_tid);
4820 
4821 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4822 {
4823         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4824         struct ieee80211_sub_if_data *sdata = sta->sdata;
4825 
4826         lockdep_assert_held(&sdata->local->sta_mtx);
4827 
4828         /* only some cases are supported right now */
4829         switch (sdata->vif.type) {
4830         case NL80211_IFTYPE_STATION:
4831         case NL80211_IFTYPE_AP:
4832         case NL80211_IFTYPE_AP_VLAN:
4833                 break;
4834         default:
4835                 WARN_ON(1);
4836                 return;
4837         }
4838 
4839         if (tid != sta->reserved_tid) {
4840                 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4841                 return;
4842         }
4843 
4844         sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4845 }
4846 EXPORT_SYMBOL(ieee80211_unreserve_tid);
4847 
4848 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4849                                  struct sk_buff *skb, int tid,
4850                                  enum nl80211_band band, u32 txdata_flags)
4851 {
4852         int ac = ieee80211_ac_from_tid(tid);
4853 
4854         skb_reset_mac_header(skb);
4855         skb_set_queue_mapping(skb, ac);
4856         skb->priority = tid;
4857 
4858         skb->dev = sdata->dev;
4859 
4860         /*
4861          * The other path calling ieee80211_xmit is from the tasklet,
4862          * and while we can handle concurrent transmissions locking
4863          * requirements are that we do not come into tx with bhs on.
4864          */
4865         local_bh_disable();
4866         IEEE80211_SKB_CB(skb)->band = band;
4867         ieee80211_xmit(sdata, NULL, skb, txdata_flags);
4868         local_bh_enable();
4869 }
4870 
4871 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
4872                               const u8 *buf, size_t len,
4873                               const u8 *dest, __be16 proto, bool unencrypted)
4874 {
4875         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4876         struct ieee80211_local *local = sdata->local;
4877         struct sk_buff *skb;
4878         struct ethhdr *ehdr;
4879         u32 flags;
4880 
4881         /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE
4882          * or Pre-Authentication
4883          */
4884         if (proto != sdata->control_port_protocol &&
4885             proto != cpu_to_be16(ETH_P_PREAUTH))
4886                 return -EINVAL;
4887 
4888         if (unencrypted)
4889                 flags = IEEE80211_TX_INTFL_DONT_ENCRYPT;
4890         else
4891                 flags = 0;
4892 
4893         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
4894                             sizeof(struct ethhdr) + len);
4895         if (!skb)
4896                 return -ENOMEM;
4897 
4898         skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr));
4899 
4900         skb_put_data(skb, buf, len);
4901 
4902         ehdr = skb_push(skb, sizeof(struct ethhdr));
4903         memcpy(ehdr->h_dest, dest, ETH_ALEN);
4904         memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
4905         ehdr->h_proto = proto;
4906 
4907         skb->dev = dev;
4908         skb->protocol = htons(ETH_P_802_3);
4909         skb_reset_network_header(skb);
4910         skb_reset_mac_header(skb);
4911 
4912         local_bh_disable();
4913         __ieee80211_subif_start_xmit(skb, skb->dev, flags);
4914         local_bh_enable();
4915 
4916         return 0;
4917 }
4918 

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