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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  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License version 2 as
 10  * published by the Free Software Foundation.
 11  *
 12  *
 13  * Transmit and frame generation functions.
 14  */
 15 
 16 #include <linux/kernel.h>
 17 #include <linux/slab.h>
 18 #include <linux/skbuff.h>
 19 #include <linux/etherdevice.h>
 20 #include <linux/bitmap.h>
 21 #include <linux/rcupdate.h>
 22 #include <linux/export.h>
 23 #include <linux/time.h>
 24 #include <net/net_namespace.h>
 25 #include <net/ieee80211_radiotap.h>
 26 #include <net/cfg80211.h>
 27 #include <net/mac80211.h>
 28 #include <asm/unaligned.h>
 29 
 30 #include "ieee80211_i.h"
 31 #include "driver-ops.h"
 32 #include "led.h"
 33 #include "mesh.h"
 34 #include "wep.h"
 35 #include "wpa.h"
 36 #include "wme.h"
 37 #include "rate.h"
 38 
 39 /* misc utils */
 40 
 41 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
 42                                  struct sk_buff *skb, int group_addr,
 43                                  int next_frag_len)
 44 {
 45         int rate, mrate, erp, dur, i, shift = 0;
 46         struct ieee80211_rate *txrate;
 47         struct ieee80211_local *local = tx->local;
 48         struct ieee80211_supported_band *sband;
 49         struct ieee80211_hdr *hdr;
 50         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 51         struct ieee80211_chanctx_conf *chanctx_conf;
 52         u32 rate_flags = 0;
 53 
 54         rcu_read_lock();
 55         chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
 56         if (chanctx_conf) {
 57                 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
 58                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 59         }
 60         rcu_read_unlock();
 61 
 62         /* assume HW handles this */
 63         if (tx->rate.flags & IEEE80211_TX_RC_MCS)
 64                 return 0;
 65 
 66         /* uh huh? */
 67         if (WARN_ON_ONCE(tx->rate.idx < 0))
 68                 return 0;
 69 
 70         sband = local->hw.wiphy->bands[info->band];
 71         txrate = &sband->bitrates[tx->rate.idx];
 72 
 73         erp = txrate->flags & IEEE80211_RATE_ERP_G;
 74 
 75         /*
 76          * data and mgmt (except PS Poll):
 77          * - during CFP: 32768
 78          * - during contention period:
 79          *   if addr1 is group address: 0
 80          *   if more fragments = 0 and addr1 is individual address: time to
 81          *      transmit one ACK plus SIFS
 82          *   if more fragments = 1 and addr1 is individual address: time to
 83          *      transmit next fragment plus 2 x ACK plus 3 x SIFS
 84          *
 85          * IEEE 802.11, 9.6:
 86          * - control response frame (CTS or ACK) shall be transmitted using the
 87          *   same rate as the immediately previous frame in the frame exchange
 88          *   sequence, if this rate belongs to the PHY mandatory rates, or else
 89          *   at the highest possible rate belonging to the PHY rates in the
 90          *   BSSBasicRateSet
 91          */
 92         hdr = (struct ieee80211_hdr *)skb->data;
 93         if (ieee80211_is_ctl(hdr->frame_control)) {
 94                 /* TODO: These control frames are not currently sent by
 95                  * mac80211, but should they be implemented, this function
 96                  * needs to be updated to support duration field calculation.
 97                  *
 98                  * RTS: time needed to transmit pending data/mgmt frame plus
 99                  *    one CTS frame plus one ACK frame plus 3 x SIFS
100                  * CTS: duration of immediately previous RTS minus time
101                  *    required to transmit CTS and its SIFS
102                  * ACK: 0 if immediately previous directed data/mgmt had
103                  *    more=0, with more=1 duration in ACK frame is duration
104                  *    from previous frame minus time needed to transmit ACK
105                  *    and its SIFS
106                  * PS Poll: BIT(15) | BIT(14) | aid
107                  */
108                 return 0;
109         }
110 
111         /* data/mgmt */
112         if (0 /* FIX: data/mgmt during CFP */)
113                 return cpu_to_le16(32768);
114 
115         if (group_addr) /* Group address as the destination - no ACK */
116                 return 0;
117 
118         /* Individual destination address:
119          * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
120          * CTS and ACK frames shall be transmitted using the highest rate in
121          * basic rate set that is less than or equal to the rate of the
122          * immediately previous frame and that is using the same modulation
123          * (CCK or OFDM). If no basic rate set matches with these requirements,
124          * the highest mandatory rate of the PHY that is less than or equal to
125          * the rate of the previous frame is used.
126          * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
127          */
128         rate = -1;
129         /* use lowest available if everything fails */
130         mrate = sband->bitrates[0].bitrate;
131         for (i = 0; i < sband->n_bitrates; i++) {
132                 struct ieee80211_rate *r = &sband->bitrates[i];
133 
134                 if (r->bitrate > txrate->bitrate)
135                         break;
136 
137                 if ((rate_flags & r->flags) != rate_flags)
138                         continue;
139 
140                 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
141                         rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
142 
143                 switch (sband->band) {
144                 case IEEE80211_BAND_2GHZ: {
145                         u32 flag;
146                         if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
147                                 flag = IEEE80211_RATE_MANDATORY_G;
148                         else
149                                 flag = IEEE80211_RATE_MANDATORY_B;
150                         if (r->flags & flag)
151                                 mrate = r->bitrate;
152                         break;
153                 }
154                 case IEEE80211_BAND_5GHZ:
155                         if (r->flags & IEEE80211_RATE_MANDATORY_A)
156                                 mrate = r->bitrate;
157                         break;
158                 case IEEE80211_BAND_60GHZ:
159                         /* TODO, for now fall through */
160                 case IEEE80211_NUM_BANDS:
161                         WARN_ON(1);
162                         break;
163                 }
164         }
165         if (rate == -1) {
166                 /* No matching basic rate found; use highest suitable mandatory
167                  * PHY rate */
168                 rate = DIV_ROUND_UP(mrate, 1 << shift);
169         }
170 
171         /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
172         if (ieee80211_is_data_qos(hdr->frame_control) &&
173             *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
174                 dur = 0;
175         else
176                 /* Time needed to transmit ACK
177                  * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
178                  * to closest integer */
179                 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
180                                 tx->sdata->vif.bss_conf.use_short_preamble,
181                                 shift);
182 
183         if (next_frag_len) {
184                 /* Frame is fragmented: duration increases with time needed to
185                  * transmit next fragment plus ACK and 2 x SIFS. */
186                 dur *= 2; /* ACK + SIFS */
187                 /* next fragment */
188                 dur += ieee80211_frame_duration(sband->band, next_frag_len,
189                                 txrate->bitrate, erp,
190                                 tx->sdata->vif.bss_conf.use_short_preamble,
191                                 shift);
192         }
193 
194         return cpu_to_le16(dur);
195 }
196 
197 /* tx handlers */
198 static ieee80211_tx_result debug_noinline
199 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
200 {
201         struct ieee80211_local *local = tx->local;
202         struct ieee80211_if_managed *ifmgd;
203 
204         /* driver doesn't support power save */
205         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
206                 return TX_CONTINUE;
207 
208         /* hardware does dynamic power save */
209         if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
210                 return TX_CONTINUE;
211 
212         /* dynamic power save disabled */
213         if (local->hw.conf.dynamic_ps_timeout <= 0)
214                 return TX_CONTINUE;
215 
216         /* we are scanning, don't enable power save */
217         if (local->scanning)
218                 return TX_CONTINUE;
219 
220         if (!local->ps_sdata)
221                 return TX_CONTINUE;
222 
223         /* No point if we're going to suspend */
224         if (local->quiescing)
225                 return TX_CONTINUE;
226 
227         /* dynamic ps is supported only in managed mode */
228         if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
229                 return TX_CONTINUE;
230 
231         ifmgd = &tx->sdata->u.mgd;
232 
233         /*
234          * Don't wakeup from power save if u-apsd is enabled, voip ac has
235          * u-apsd enabled and the frame is in voip class. This effectively
236          * means that even if all access categories have u-apsd enabled, in
237          * practise u-apsd is only used with the voip ac. This is a
238          * workaround for the case when received voip class packets do not
239          * have correct qos tag for some reason, due the network or the
240          * peer application.
241          *
242          * Note: ifmgd->uapsd_queues access is racy here. If the value is
243          * changed via debugfs, user needs to reassociate manually to have
244          * everything in sync.
245          */
246         if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
247             (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
248             skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
249                 return TX_CONTINUE;
250 
251         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
252                 ieee80211_stop_queues_by_reason(&local->hw,
253                                                 IEEE80211_MAX_QUEUE_MAP,
254                                                 IEEE80211_QUEUE_STOP_REASON_PS,
255                                                 false);
256                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
257                 ieee80211_queue_work(&local->hw,
258                                      &local->dynamic_ps_disable_work);
259         }
260 
261         /* Don't restart the timer if we're not disassociated */
262         if (!ifmgd->associated)
263                 return TX_CONTINUE;
264 
265         mod_timer(&local->dynamic_ps_timer, jiffies +
266                   msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
267 
268         return TX_CONTINUE;
269 }
270 
271 static ieee80211_tx_result debug_noinline
272 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
273 {
274 
275         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
276         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
277         bool assoc = false;
278 
279         if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
280                 return TX_CONTINUE;
281 
282         if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
283             test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
284             !ieee80211_is_probe_req(hdr->frame_control) &&
285             !ieee80211_is_nullfunc(hdr->frame_control))
286                 /*
287                  * When software scanning only nullfunc frames (to notify
288                  * the sleep state to the AP) and probe requests (for the
289                  * active scan) are allowed, all other frames should not be
290                  * sent and we should not get here, but if we do
291                  * nonetheless, drop them to avoid sending them
292                  * off-channel. See the link below and
293                  * ieee80211_start_scan() for more.
294                  *
295                  * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
296                  */
297                 return TX_DROP;
298 
299         if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
300                 return TX_CONTINUE;
301 
302         if (tx->flags & IEEE80211_TX_PS_BUFFERED)
303                 return TX_CONTINUE;
304 
305         if (tx->sta)
306                 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
307 
308         if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
309                 if (unlikely(!assoc &&
310                              ieee80211_is_data(hdr->frame_control))) {
311 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
312                         sdata_info(tx->sdata,
313                                    "dropped data frame to not associated station %pM\n",
314                                    hdr->addr1);
315 #endif
316                         I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
317                         return TX_DROP;
318                 }
319         } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
320                             ieee80211_is_data(hdr->frame_control) &&
321                             !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
322                 /*
323                  * No associated STAs - no need to send multicast
324                  * frames.
325                  */
326                 return TX_DROP;
327         }
328 
329         return TX_CONTINUE;
330 }
331 
332 /* This function is called whenever the AP is about to exceed the maximum limit
333  * of buffered frames for power saving STAs. This situation should not really
334  * happen often during normal operation, so dropping the oldest buffered packet
335  * from each queue should be OK to make some room for new frames. */
336 static void purge_old_ps_buffers(struct ieee80211_local *local)
337 {
338         int total = 0, purged = 0;
339         struct sk_buff *skb;
340         struct ieee80211_sub_if_data *sdata;
341         struct sta_info *sta;
342 
343         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
344                 struct ps_data *ps;
345 
346                 if (sdata->vif.type == NL80211_IFTYPE_AP)
347                         ps = &sdata->u.ap.ps;
348                 else if (ieee80211_vif_is_mesh(&sdata->vif))
349                         ps = &sdata->u.mesh.ps;
350                 else
351                         continue;
352 
353                 skb = skb_dequeue(&ps->bc_buf);
354                 if (skb) {
355                         purged++;
356                         ieee80211_free_txskb(&local->hw, skb);
357                 }
358                 total += skb_queue_len(&ps->bc_buf);
359         }
360 
361         /*
362          * Drop one frame from each station from the lowest-priority
363          * AC that has frames at all.
364          */
365         list_for_each_entry_rcu(sta, &local->sta_list, list) {
366                 int ac;
367 
368                 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
369                         skb = skb_dequeue(&sta->ps_tx_buf[ac]);
370                         total += skb_queue_len(&sta->ps_tx_buf[ac]);
371                         if (skb) {
372                                 purged++;
373                                 ieee80211_free_txskb(&local->hw, skb);
374                                 break;
375                         }
376                 }
377         }
378 
379         local->total_ps_buffered = total;
380         ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
381 }
382 
383 static ieee80211_tx_result
384 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
385 {
386         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
387         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
388         struct ps_data *ps;
389 
390         /*
391          * broadcast/multicast frame
392          *
393          * If any of the associated/peer stations is in power save mode,
394          * the frame is buffered to be sent after DTIM beacon frame.
395          * This is done either by the hardware or us.
396          */
397 
398         /* powersaving STAs currently only in AP/VLAN/mesh mode */
399         if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
400             tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
401                 if (!tx->sdata->bss)
402                         return TX_CONTINUE;
403 
404                 ps = &tx->sdata->bss->ps;
405         } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
406                 ps = &tx->sdata->u.mesh.ps;
407         } else {
408                 return TX_CONTINUE;
409         }
410 
411 
412         /* no buffering for ordered frames */
413         if (ieee80211_has_order(hdr->frame_control))
414                 return TX_CONTINUE;
415 
416         if (ieee80211_is_probe_req(hdr->frame_control))
417                 return TX_CONTINUE;
418 
419         if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
420                 info->hw_queue = tx->sdata->vif.cab_queue;
421 
422         /* no stations in PS mode and no buffered packets */
423         if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf))
424                 return TX_CONTINUE;
425 
426         info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
427 
428         /* device releases frame after DTIM beacon */
429         if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
430                 return TX_CONTINUE;
431 
432         /* buffered in mac80211 */
433         if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
434                 purge_old_ps_buffers(tx->local);
435 
436         if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
437                 ps_dbg(tx->sdata,
438                        "BC TX buffer full - dropping the oldest frame\n");
439                 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
440         } else
441                 tx->local->total_ps_buffered++;
442 
443         skb_queue_tail(&ps->bc_buf, tx->skb);
444 
445         return TX_QUEUED;
446 }
447 
448 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
449                              struct sk_buff *skb)
450 {
451         if (!ieee80211_is_mgmt(fc))
452                 return 0;
453 
454         if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
455                 return 0;
456 
457         if (!ieee80211_is_robust_mgmt_frame(skb))
458                 return 0;
459 
460         return 1;
461 }
462 
463 static ieee80211_tx_result
464 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
465 {
466         struct sta_info *sta = tx->sta;
467         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
468         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
469         struct ieee80211_local *local = tx->local;
470 
471         if (unlikely(!sta))
472                 return TX_CONTINUE;
473 
474         if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
475                       test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
476                       test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
477                      !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
478                 int ac = skb_get_queue_mapping(tx->skb);
479 
480                 if (ieee80211_is_mgmt(hdr->frame_control) &&
481                     !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
482                         info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
483                         return TX_CONTINUE;
484                 }
485 
486                 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
487                        sta->sta.addr, sta->sta.aid, ac);
488                 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
489                         purge_old_ps_buffers(tx->local);
490 
491                 /* sync with ieee80211_sta_ps_deliver_wakeup */
492                 spin_lock(&sta->ps_lock);
493                 /*
494                  * STA woke up the meantime and all the frames on ps_tx_buf have
495                  * been queued to pending queue. No reordering can happen, go
496                  * ahead and Tx the packet.
497                  */
498                 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
499                     !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
500                     !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
501                         spin_unlock(&sta->ps_lock);
502                         return TX_CONTINUE;
503                 }
504 
505                 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
506                         struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
507                         ps_dbg(tx->sdata,
508                                "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
509                                sta->sta.addr, ac);
510                         ieee80211_free_txskb(&local->hw, old);
511                 } else
512                         tx->local->total_ps_buffered++;
513 
514                 info->control.jiffies = jiffies;
515                 info->control.vif = &tx->sdata->vif;
516                 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
517                 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
518                 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
519                 spin_unlock(&sta->ps_lock);
520 
521                 if (!timer_pending(&local->sta_cleanup))
522                         mod_timer(&local->sta_cleanup,
523                                   round_jiffies(jiffies +
524                                                 STA_INFO_CLEANUP_INTERVAL));
525 
526                 /*
527                  * We queued up some frames, so the TIM bit might
528                  * need to be set, recalculate it.
529                  */
530                 sta_info_recalc_tim(sta);
531 
532                 return TX_QUEUED;
533         } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
534                 ps_dbg(tx->sdata,
535                        "STA %pM in PS mode, but polling/in SP -> send frame\n",
536                        sta->sta.addr);
537         }
538 
539         return TX_CONTINUE;
540 }
541 
542 static ieee80211_tx_result debug_noinline
543 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
544 {
545         if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
546                 return TX_CONTINUE;
547 
548         if (tx->flags & IEEE80211_TX_UNICAST)
549                 return ieee80211_tx_h_unicast_ps_buf(tx);
550         else
551                 return ieee80211_tx_h_multicast_ps_buf(tx);
552 }
553 
554 static ieee80211_tx_result debug_noinline
555 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
556 {
557         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
558 
559         if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
560                 if (tx->sdata->control_port_no_encrypt)
561                         info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
562                 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
563                 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
564         }
565 
566         return TX_CONTINUE;
567 }
568 
569 static ieee80211_tx_result debug_noinline
570 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
571 {
572         struct ieee80211_key *key;
573         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
574         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
575 
576         if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
577                 tx->key = NULL;
578         else if (tx->sta &&
579                  (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
580                 tx->key = key;
581         else if (ieee80211_is_mgmt(hdr->frame_control) &&
582                  is_multicast_ether_addr(hdr->addr1) &&
583                  ieee80211_is_robust_mgmt_frame(tx->skb) &&
584                  (key = rcu_dereference(tx->sdata->default_mgmt_key)))
585                 tx->key = key;
586         else if (is_multicast_ether_addr(hdr->addr1) &&
587                  (key = rcu_dereference(tx->sdata->default_multicast_key)))
588                 tx->key = key;
589         else if (!is_multicast_ether_addr(hdr->addr1) &&
590                  (key = rcu_dereference(tx->sdata->default_unicast_key)))
591                 tx->key = key;
592         else if (info->flags & IEEE80211_TX_CTL_INJECTED)
593                 tx->key = NULL;
594         else if (!tx->sdata->drop_unencrypted)
595                 tx->key = NULL;
596         else if (tx->skb->protocol == tx->sdata->control_port_protocol)
597                 tx->key = NULL;
598         else if (ieee80211_is_robust_mgmt_frame(tx->skb) &&
599                  !(ieee80211_is_action(hdr->frame_control) &&
600                    tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
601                 tx->key = NULL;
602         else if (ieee80211_is_mgmt(hdr->frame_control) &&
603                  !ieee80211_is_robust_mgmt_frame(tx->skb))
604                 tx->key = NULL;
605         else {
606                 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
607                 return TX_DROP;
608         }
609 
610         if (tx->key) {
611                 bool skip_hw = false;
612 
613                 tx->key->tx_rx_count++;
614                 /* TODO: add threshold stuff again */
615 
616                 switch (tx->key->conf.cipher) {
617                 case WLAN_CIPHER_SUITE_WEP40:
618                 case WLAN_CIPHER_SUITE_WEP104:
619                 case WLAN_CIPHER_SUITE_TKIP:
620                         if (!ieee80211_is_data_present(hdr->frame_control))
621                                 tx->key = NULL;
622                         break;
623                 case WLAN_CIPHER_SUITE_CCMP:
624                         if (!ieee80211_is_data_present(hdr->frame_control) &&
625                             !ieee80211_use_mfp(hdr->frame_control, tx->sta,
626                                                tx->skb))
627                                 tx->key = NULL;
628                         else
629                                 skip_hw = (tx->key->conf.flags &
630                                            IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
631                                         ieee80211_is_mgmt(hdr->frame_control);
632                         break;
633                 case WLAN_CIPHER_SUITE_AES_CMAC:
634                         if (!ieee80211_is_mgmt(hdr->frame_control))
635                                 tx->key = NULL;
636                         break;
637                 }
638 
639                 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
640                              !ieee80211_is_deauth(hdr->frame_control)))
641                         return TX_DROP;
642 
643                 if (!skip_hw && tx->key &&
644                     tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
645                         info->control.hw_key = &tx->key->conf;
646         }
647 
648         return TX_CONTINUE;
649 }
650 
651 static ieee80211_tx_result debug_noinline
652 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
653 {
654         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
655         struct ieee80211_hdr *hdr = (void *)tx->skb->data;
656         struct ieee80211_supported_band *sband;
657         u32 len;
658         struct ieee80211_tx_rate_control txrc;
659         struct ieee80211_sta_rates *ratetbl = NULL;
660         bool assoc = false;
661 
662         memset(&txrc, 0, sizeof(txrc));
663 
664         sband = tx->local->hw.wiphy->bands[info->band];
665 
666         len = min_t(u32, tx->skb->len + FCS_LEN,
667                          tx->local->hw.wiphy->frag_threshold);
668 
669         /* set up the tx rate control struct we give the RC algo */
670         txrc.hw = &tx->local->hw;
671         txrc.sband = sband;
672         txrc.bss_conf = &tx->sdata->vif.bss_conf;
673         txrc.skb = tx->skb;
674         txrc.reported_rate.idx = -1;
675         txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
676         if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
677                 txrc.max_rate_idx = -1;
678         else
679                 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
680 
681         if (tx->sdata->rc_has_mcs_mask[info->band])
682                 txrc.rate_idx_mcs_mask =
683                         tx->sdata->rc_rateidx_mcs_mask[info->band];
684 
685         txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
686                     tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
687                     tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
688 
689         /* set up RTS protection if desired */
690         if (len > tx->local->hw.wiphy->rts_threshold) {
691                 txrc.rts = true;
692         }
693 
694         info->control.use_rts = txrc.rts;
695         info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
696 
697         /*
698          * Use short preamble if the BSS can handle it, but not for
699          * management frames unless we know the receiver can handle
700          * that -- the management frame might be to a station that
701          * just wants a probe response.
702          */
703         if (tx->sdata->vif.bss_conf.use_short_preamble &&
704             (ieee80211_is_data(hdr->frame_control) ||
705              (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
706                 txrc.short_preamble = true;
707 
708         info->control.short_preamble = txrc.short_preamble;
709 
710         if (tx->sta)
711                 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
712 
713         /*
714          * Lets not bother rate control if we're associated and cannot
715          * talk to the sta. This should not happen.
716          */
717         if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
718                  !rate_usable_index_exists(sband, &tx->sta->sta),
719                  "%s: Dropped data frame as no usable bitrate found while "
720                  "scanning and associated. Target station: "
721                  "%pM on %d GHz band\n",
722                  tx->sdata->name, hdr->addr1,
723                  info->band ? 5 : 2))
724                 return TX_DROP;
725 
726         /*
727          * If we're associated with the sta at this point we know we can at
728          * least send the frame at the lowest bit rate.
729          */
730         rate_control_get_rate(tx->sdata, tx->sta, &txrc);
731 
732         if (tx->sta && !info->control.skip_table)
733                 ratetbl = rcu_dereference(tx->sta->sta.rates);
734 
735         if (unlikely(info->control.rates[0].idx < 0)) {
736                 if (ratetbl) {
737                         struct ieee80211_tx_rate rate = {
738                                 .idx = ratetbl->rate[0].idx,
739                                 .flags = ratetbl->rate[0].flags,
740                                 .count = ratetbl->rate[0].count
741                         };
742 
743                         if (ratetbl->rate[0].idx < 0)
744                                 return TX_DROP;
745 
746                         tx->rate = rate;
747                 } else {
748                         return TX_DROP;
749                 }
750         } else {
751                 tx->rate = info->control.rates[0];
752         }
753 
754         if (txrc.reported_rate.idx < 0) {
755                 txrc.reported_rate = tx->rate;
756                 if (tx->sta && ieee80211_is_data(hdr->frame_control))
757                         tx->sta->last_tx_rate = txrc.reported_rate;
758         } else if (tx->sta)
759                 tx->sta->last_tx_rate = txrc.reported_rate;
760 
761         if (ratetbl)
762                 return TX_CONTINUE;
763 
764         if (unlikely(!info->control.rates[0].count))
765                 info->control.rates[0].count = 1;
766 
767         if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
768                          (info->flags & IEEE80211_TX_CTL_NO_ACK)))
769                 info->control.rates[0].count = 1;
770 
771         return TX_CONTINUE;
772 }
773 
774 static ieee80211_tx_result debug_noinline
775 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
776 {
777         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
778         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
779         u16 *seq;
780         u8 *qc;
781         int tid;
782 
783         /*
784          * Packet injection may want to control the sequence
785          * number, if we have no matching interface then we
786          * neither assign one ourselves nor ask the driver to.
787          */
788         if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
789                 return TX_CONTINUE;
790 
791         if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
792                 return TX_CONTINUE;
793 
794         if (ieee80211_hdrlen(hdr->frame_control) < 24)
795                 return TX_CONTINUE;
796 
797         if (ieee80211_is_qos_nullfunc(hdr->frame_control))
798                 return TX_CONTINUE;
799 
800         /*
801          * Anything but QoS data that has a sequence number field
802          * (is long enough) gets a sequence number from the global
803          * counter.  QoS data frames with a multicast destination
804          * also use the global counter (802.11-2012 9.3.2.10).
805          */
806         if (!ieee80211_is_data_qos(hdr->frame_control) ||
807             is_multicast_ether_addr(hdr->addr1)) {
808                 /* driver should assign sequence number */
809                 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
810                 /* for pure STA mode without beacons, we can do it */
811                 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
812                 tx->sdata->sequence_number += 0x10;
813                 return TX_CONTINUE;
814         }
815 
816         /*
817          * This should be true for injected/management frames only, for
818          * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
819          * above since they are not QoS-data frames.
820          */
821         if (!tx->sta)
822                 return TX_CONTINUE;
823 
824         /* include per-STA, per-TID sequence counter */
825 
826         qc = ieee80211_get_qos_ctl(hdr);
827         tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
828         seq = &tx->sta->tid_seq[tid];
829 
830         hdr->seq_ctrl = cpu_to_le16(*seq);
831 
832         /* Increase the sequence number. */
833         *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
834 
835         return TX_CONTINUE;
836 }
837 
838 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
839                               struct sk_buff *skb, int hdrlen,
840                               int frag_threshold)
841 {
842         struct ieee80211_local *local = tx->local;
843         struct ieee80211_tx_info *info;
844         struct sk_buff *tmp;
845         int per_fragm = frag_threshold - hdrlen - FCS_LEN;
846         int pos = hdrlen + per_fragm;
847         int rem = skb->len - hdrlen - per_fragm;
848 
849         if (WARN_ON(rem < 0))
850                 return -EINVAL;
851 
852         /* first fragment was already added to queue by caller */
853 
854         while (rem) {
855                 int fraglen = per_fragm;
856 
857                 if (fraglen > rem)
858                         fraglen = rem;
859                 rem -= fraglen;
860                 tmp = dev_alloc_skb(local->tx_headroom +
861                                     frag_threshold +
862                                     tx->sdata->encrypt_headroom +
863                                     IEEE80211_ENCRYPT_TAILROOM);
864                 if (!tmp)
865                         return -ENOMEM;
866 
867                 __skb_queue_tail(&tx->skbs, tmp);
868 
869                 skb_reserve(tmp,
870                             local->tx_headroom + tx->sdata->encrypt_headroom);
871 
872                 /* copy control information */
873                 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
874 
875                 info = IEEE80211_SKB_CB(tmp);
876                 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
877                                  IEEE80211_TX_CTL_FIRST_FRAGMENT);
878 
879                 if (rem)
880                         info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
881 
882                 skb_copy_queue_mapping(tmp, skb);
883                 tmp->priority = skb->priority;
884                 tmp->dev = skb->dev;
885 
886                 /* copy header and data */
887                 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
888                 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
889 
890                 pos += fraglen;
891         }
892 
893         /* adjust first fragment's length */
894         skb_trim(skb, hdrlen + per_fragm);
895         return 0;
896 }
897 
898 static ieee80211_tx_result debug_noinline
899 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
900 {
901         struct sk_buff *skb = tx->skb;
902         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
903         struct ieee80211_hdr *hdr = (void *)skb->data;
904         int frag_threshold = tx->local->hw.wiphy->frag_threshold;
905         int hdrlen;
906         int fragnum;
907 
908         /* no matter what happens, tx->skb moves to tx->skbs */
909         __skb_queue_tail(&tx->skbs, skb);
910         tx->skb = NULL;
911 
912         if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
913                 return TX_CONTINUE;
914 
915         if (tx->local->ops->set_frag_threshold)
916                 return TX_CONTINUE;
917 
918         /*
919          * Warn when submitting a fragmented A-MPDU frame and drop it.
920          * This scenario is handled in ieee80211_tx_prepare but extra
921          * caution taken here as fragmented ampdu may cause Tx stop.
922          */
923         if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
924                 return TX_DROP;
925 
926         hdrlen = ieee80211_hdrlen(hdr->frame_control);
927 
928         /* internal error, why isn't DONTFRAG set? */
929         if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
930                 return TX_DROP;
931 
932         /*
933          * Now fragment the frame. This will allocate all the fragments and
934          * chain them (using skb as the first fragment) to skb->next.
935          * During transmission, we will remove the successfully transmitted
936          * fragments from this list. When the low-level driver rejects one
937          * of the fragments then we will simply pretend to accept the skb
938          * but store it away as pending.
939          */
940         if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
941                 return TX_DROP;
942 
943         /* update duration/seq/flags of fragments */
944         fragnum = 0;
945 
946         skb_queue_walk(&tx->skbs, skb) {
947                 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
948 
949                 hdr = (void *)skb->data;
950                 info = IEEE80211_SKB_CB(skb);
951 
952                 if (!skb_queue_is_last(&tx->skbs, skb)) {
953                         hdr->frame_control |= morefrags;
954                         /*
955                          * No multi-rate retries for fragmented frames, that
956                          * would completely throw off the NAV at other STAs.
957                          */
958                         info->control.rates[1].idx = -1;
959                         info->control.rates[2].idx = -1;
960                         info->control.rates[3].idx = -1;
961                         BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
962                         info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
963                 } else {
964                         hdr->frame_control &= ~morefrags;
965                 }
966                 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
967                 fragnum++;
968         }
969 
970         return TX_CONTINUE;
971 }
972 
973 static ieee80211_tx_result debug_noinline
974 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
975 {
976         struct sk_buff *skb;
977         int ac = -1;
978 
979         if (!tx->sta)
980                 return TX_CONTINUE;
981 
982         skb_queue_walk(&tx->skbs, skb) {
983                 ac = skb_get_queue_mapping(skb);
984                 tx->sta->tx_fragments++;
985                 tx->sta->tx_bytes[ac] += skb->len;
986         }
987         if (ac >= 0)
988                 tx->sta->tx_packets[ac]++;
989 
990         return TX_CONTINUE;
991 }
992 
993 static ieee80211_tx_result debug_noinline
994 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
995 {
996         if (!tx->key)
997                 return TX_CONTINUE;
998 
999         switch (tx->key->conf.cipher) {
1000         case WLAN_CIPHER_SUITE_WEP40:
1001         case WLAN_CIPHER_SUITE_WEP104:
1002                 return ieee80211_crypto_wep_encrypt(tx);
1003         case WLAN_CIPHER_SUITE_TKIP:
1004                 return ieee80211_crypto_tkip_encrypt(tx);
1005         case WLAN_CIPHER_SUITE_CCMP:
1006                 return ieee80211_crypto_ccmp_encrypt(tx);
1007         case WLAN_CIPHER_SUITE_AES_CMAC:
1008                 return ieee80211_crypto_aes_cmac_encrypt(tx);
1009         default:
1010                 return ieee80211_crypto_hw_encrypt(tx);
1011         }
1012 
1013         return TX_DROP;
1014 }
1015 
1016 static ieee80211_tx_result debug_noinline
1017 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1018 {
1019         struct sk_buff *skb;
1020         struct ieee80211_hdr *hdr;
1021         int next_len;
1022         bool group_addr;
1023 
1024         skb_queue_walk(&tx->skbs, skb) {
1025                 hdr = (void *) skb->data;
1026                 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1027                         break; /* must not overwrite AID */
1028                 if (!skb_queue_is_last(&tx->skbs, skb)) {
1029                         struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1030                         next_len = next->len;
1031                 } else
1032                         next_len = 0;
1033                 group_addr = is_multicast_ether_addr(hdr->addr1);
1034 
1035                 hdr->duration_id =
1036                         ieee80211_duration(tx, skb, group_addr, next_len);
1037         }
1038 
1039         return TX_CONTINUE;
1040 }
1041 
1042 /* actual transmit path */
1043 
1044 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1045                                   struct sk_buff *skb,
1046                                   struct ieee80211_tx_info *info,
1047                                   struct tid_ampdu_tx *tid_tx,
1048                                   int tid)
1049 {
1050         bool queued = false;
1051         bool reset_agg_timer = false;
1052         struct sk_buff *purge_skb = NULL;
1053 
1054         if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1055                 info->flags |= IEEE80211_TX_CTL_AMPDU;
1056                 reset_agg_timer = true;
1057         } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1058                 /*
1059                  * nothing -- this aggregation session is being started
1060                  * but that might still fail with the driver
1061                  */
1062         } else {
1063                 spin_lock(&tx->sta->lock);
1064                 /*
1065                  * Need to re-check now, because we may get here
1066                  *
1067                  *  1) in the window during which the setup is actually
1068                  *     already done, but not marked yet because not all
1069                  *     packets are spliced over to the driver pending
1070                  *     queue yet -- if this happened we acquire the lock
1071                  *     either before or after the splice happens, but
1072                  *     need to recheck which of these cases happened.
1073                  *
1074                  *  2) during session teardown, if the OPERATIONAL bit
1075                  *     was cleared due to the teardown but the pointer
1076                  *     hasn't been assigned NULL yet (or we loaded it
1077                  *     before it was assigned) -- in this case it may
1078                  *     now be NULL which means we should just let the
1079                  *     packet pass through because splicing the frames
1080                  *     back is already done.
1081                  */
1082                 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1083 
1084                 if (!tid_tx) {
1085                         /* do nothing, let packet pass through */
1086                 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1087                         info->flags |= IEEE80211_TX_CTL_AMPDU;
1088                         reset_agg_timer = true;
1089                 } else {
1090                         queued = true;
1091                         info->control.vif = &tx->sdata->vif;
1092                         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1093                         info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1094                         __skb_queue_tail(&tid_tx->pending, skb);
1095                         if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1096                                 purge_skb = __skb_dequeue(&tid_tx->pending);
1097                 }
1098                 spin_unlock(&tx->sta->lock);
1099 
1100                 if (purge_skb)
1101                         ieee80211_free_txskb(&tx->local->hw, purge_skb);
1102         }
1103 
1104         /* reset session timer */
1105         if (reset_agg_timer && tid_tx->timeout)
1106                 tid_tx->last_tx = jiffies;
1107 
1108         return queued;
1109 }
1110 
1111 /*
1112  * initialises @tx
1113  */
1114 static ieee80211_tx_result
1115 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1116                      struct ieee80211_tx_data *tx,
1117                      struct sk_buff *skb)
1118 {
1119         struct ieee80211_local *local = sdata->local;
1120         struct ieee80211_hdr *hdr;
1121         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1122         int tid;
1123         u8 *qc;
1124 
1125         memset(tx, 0, sizeof(*tx));
1126         tx->skb = skb;
1127         tx->local = local;
1128         tx->sdata = sdata;
1129         __skb_queue_head_init(&tx->skbs);
1130 
1131         /*
1132          * If this flag is set to true anywhere, and we get here,
1133          * we are doing the needed processing, so remove the flag
1134          * now.
1135          */
1136         info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1137 
1138         hdr = (struct ieee80211_hdr *) skb->data;
1139 
1140         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1141                 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1142                 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1143                         return TX_DROP;
1144         } else if (info->flags & (IEEE80211_TX_CTL_INJECTED |
1145                                   IEEE80211_TX_INTFL_NL80211_FRAME_TX) ||
1146                    tx->sdata->control_port_protocol == tx->skb->protocol) {
1147                 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1148         }
1149         if (!tx->sta)
1150                 tx->sta = sta_info_get(sdata, hdr->addr1);
1151 
1152         if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1153             !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1154             (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1155             !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1156                 struct tid_ampdu_tx *tid_tx;
1157 
1158                 qc = ieee80211_get_qos_ctl(hdr);
1159                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1160 
1161                 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1162                 if (tid_tx) {
1163                         bool queued;
1164 
1165                         queued = ieee80211_tx_prep_agg(tx, skb, info,
1166                                                        tid_tx, tid);
1167 
1168                         if (unlikely(queued))
1169                                 return TX_QUEUED;
1170                 }
1171         }
1172 
1173         if (is_multicast_ether_addr(hdr->addr1)) {
1174                 tx->flags &= ~IEEE80211_TX_UNICAST;
1175                 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1176         } else
1177                 tx->flags |= IEEE80211_TX_UNICAST;
1178 
1179         if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1180                 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1181                     skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1182                     info->flags & IEEE80211_TX_CTL_AMPDU)
1183                         info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1184         }
1185 
1186         if (!tx->sta)
1187                 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1188         else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1189                 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1190 
1191         info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1192 
1193         return TX_CONTINUE;
1194 }
1195 
1196 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1197                                struct ieee80211_vif *vif,
1198                                struct ieee80211_sta *sta,
1199                                struct sk_buff_head *skbs,
1200                                bool txpending)
1201 {
1202         struct ieee80211_tx_control control;
1203         struct sk_buff *skb, *tmp;
1204         unsigned long flags;
1205 
1206         skb_queue_walk_safe(skbs, skb, tmp) {
1207                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1208                 int q = info->hw_queue;
1209 
1210 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1211                 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1212                         __skb_unlink(skb, skbs);
1213                         ieee80211_free_txskb(&local->hw, skb);
1214                         continue;
1215                 }
1216 #endif
1217 
1218                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1219                 if (local->queue_stop_reasons[q] ||
1220                     (!txpending && !skb_queue_empty(&local->pending[q]))) {
1221                         if (unlikely(info->flags &
1222                                      IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1223                                 if (local->queue_stop_reasons[q] &
1224                                     ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1225                                         /*
1226                                          * Drop off-channel frames if queues
1227                                          * are stopped for any reason other
1228                                          * than off-channel operation. Never
1229                                          * queue them.
1230                                          */
1231                                         spin_unlock_irqrestore(
1232                                                 &local->queue_stop_reason_lock,
1233                                                 flags);
1234                                         ieee80211_purge_tx_queue(&local->hw,
1235                                                                  skbs);
1236                                         return true;
1237                                 }
1238                         } else {
1239 
1240                                 /*
1241                                  * Since queue is stopped, queue up frames for
1242                                  * later transmission from the tx-pending
1243                                  * tasklet when the queue is woken again.
1244                                  */
1245                                 if (txpending)
1246                                         skb_queue_splice_init(skbs,
1247                                                               &local->pending[q]);
1248                                 else
1249                                         skb_queue_splice_tail_init(skbs,
1250                                                                    &local->pending[q]);
1251 
1252                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1253                                                        flags);
1254                                 return false;
1255                         }
1256                 }
1257                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1258 
1259                 info->control.vif = vif;
1260                 control.sta = sta;
1261 
1262                 __skb_unlink(skb, skbs);
1263                 drv_tx(local, &control, skb);
1264         }
1265 
1266         return true;
1267 }
1268 
1269 /*
1270  * Returns false if the frame couldn't be transmitted but was queued instead.
1271  */
1272 static bool __ieee80211_tx(struct ieee80211_local *local,
1273                            struct sk_buff_head *skbs, int led_len,
1274                            struct sta_info *sta, bool txpending)
1275 {
1276         struct ieee80211_tx_info *info;
1277         struct ieee80211_sub_if_data *sdata;
1278         struct ieee80211_vif *vif;
1279         struct ieee80211_sta *pubsta;
1280         struct sk_buff *skb;
1281         bool result = true;
1282         __le16 fc;
1283 
1284         if (WARN_ON(skb_queue_empty(skbs)))
1285                 return true;
1286 
1287         skb = skb_peek(skbs);
1288         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1289         info = IEEE80211_SKB_CB(skb);
1290         sdata = vif_to_sdata(info->control.vif);
1291         if (sta && !sta->uploaded)
1292                 sta = NULL;
1293 
1294         if (sta)
1295                 pubsta = &sta->sta;
1296         else
1297                 pubsta = NULL;
1298 
1299         switch (sdata->vif.type) {
1300         case NL80211_IFTYPE_MONITOR:
1301                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
1302                         vif = &sdata->vif;
1303                         break;
1304                 }
1305                 sdata = rcu_dereference(local->monitor_sdata);
1306                 if (sdata) {
1307                         vif = &sdata->vif;
1308                         info->hw_queue =
1309                                 vif->hw_queue[skb_get_queue_mapping(skb)];
1310                 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1311                         dev_kfree_skb(skb);
1312                         return true;
1313                 } else
1314                         vif = NULL;
1315                 break;
1316         case NL80211_IFTYPE_AP_VLAN:
1317                 sdata = container_of(sdata->bss,
1318                                      struct ieee80211_sub_if_data, u.ap);
1319                 /* fall through */
1320         default:
1321                 vif = &sdata->vif;
1322                 break;
1323         }
1324 
1325         result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1326                                     txpending);
1327 
1328         ieee80211_tpt_led_trig_tx(local, fc, led_len);
1329 
1330         WARN_ON_ONCE(!skb_queue_empty(skbs));
1331 
1332         return result;
1333 }
1334 
1335 /*
1336  * Invoke TX handlers, return 0 on success and non-zero if the
1337  * frame was dropped or queued.
1338  */
1339 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1340 {
1341         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1342         ieee80211_tx_result res = TX_DROP;
1343 
1344 #define CALL_TXH(txh) \
1345         do {                            \
1346                 res = txh(tx);          \
1347                 if (res != TX_CONTINUE) \
1348                         goto txh_done;  \
1349         } while (0)
1350 
1351         CALL_TXH(ieee80211_tx_h_dynamic_ps);
1352         CALL_TXH(ieee80211_tx_h_check_assoc);
1353         CALL_TXH(ieee80211_tx_h_ps_buf);
1354         CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1355         CALL_TXH(ieee80211_tx_h_select_key);
1356         if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1357                 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1358 
1359         if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1360                 __skb_queue_tail(&tx->skbs, tx->skb);
1361                 tx->skb = NULL;
1362                 goto txh_done;
1363         }
1364 
1365         CALL_TXH(ieee80211_tx_h_michael_mic_add);
1366         CALL_TXH(ieee80211_tx_h_sequence);
1367         CALL_TXH(ieee80211_tx_h_fragment);
1368         /* handlers after fragment must be aware of tx info fragmentation! */
1369         CALL_TXH(ieee80211_tx_h_stats);
1370         CALL_TXH(ieee80211_tx_h_encrypt);
1371         if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1372                 CALL_TXH(ieee80211_tx_h_calculate_duration);
1373 #undef CALL_TXH
1374 
1375  txh_done:
1376         if (unlikely(res == TX_DROP)) {
1377                 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1378                 if (tx->skb)
1379                         ieee80211_free_txskb(&tx->local->hw, tx->skb);
1380                 else
1381                         ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1382                 return -1;
1383         } else if (unlikely(res == TX_QUEUED)) {
1384                 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1385                 return -1;
1386         }
1387 
1388         return 0;
1389 }
1390 
1391 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1392                               struct ieee80211_vif *vif, struct sk_buff *skb,
1393                               int band, struct ieee80211_sta **sta)
1394 {
1395         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1396         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1397         struct ieee80211_tx_data tx;
1398 
1399         if (ieee80211_tx_prepare(sdata, &tx, skb) == TX_DROP)
1400                 return false;
1401 
1402         info->band = band;
1403         info->control.vif = vif;
1404         info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1405 
1406         if (invoke_tx_handlers(&tx))
1407                 return false;
1408 
1409         if (sta) {
1410                 if (tx.sta)
1411                         *sta = &tx.sta->sta;
1412                 else
1413                         *sta = NULL;
1414         }
1415 
1416         return true;
1417 }
1418 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1419 
1420 /*
1421  * Returns false if the frame couldn't be transmitted but was queued instead.
1422  */
1423 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1424                          struct sk_buff *skb, bool txpending,
1425                          enum ieee80211_band band)
1426 {
1427         struct ieee80211_local *local = sdata->local;
1428         struct ieee80211_tx_data tx;
1429         ieee80211_tx_result res_prepare;
1430         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1431         bool result = true;
1432         int led_len;
1433 
1434         if (unlikely(skb->len < 10)) {
1435                 dev_kfree_skb(skb);
1436                 return true;
1437         }
1438 
1439         /* initialises tx */
1440         led_len = skb->len;
1441         res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1442 
1443         if (unlikely(res_prepare == TX_DROP)) {
1444                 ieee80211_free_txskb(&local->hw, skb);
1445                 return true;
1446         } else if (unlikely(res_prepare == TX_QUEUED)) {
1447                 return true;
1448         }
1449 
1450         info->band = band;
1451 
1452         /* set up hw_queue value early */
1453         if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1454             !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1455                 info->hw_queue =
1456                         sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1457 
1458         if (!invoke_tx_handlers(&tx))
1459                 result = __ieee80211_tx(local, &tx.skbs, led_len,
1460                                         tx.sta, txpending);
1461 
1462         return result;
1463 }
1464 
1465 /* device xmit handlers */
1466 
1467 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1468                                 struct sk_buff *skb,
1469                                 int head_need, bool may_encrypt)
1470 {
1471         struct ieee80211_local *local = sdata->local;
1472         int tail_need = 0;
1473 
1474         if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1475                 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1476                 tail_need -= skb_tailroom(skb);
1477                 tail_need = max_t(int, tail_need, 0);
1478         }
1479 
1480         if (skb_cloned(skb) &&
1481             (!(local->hw.flags & IEEE80211_HW_SUPPORTS_CLONED_SKBS) ||
1482              !skb_clone_writable(skb, ETH_HLEN) ||
1483              sdata->crypto_tx_tailroom_needed_cnt))
1484                 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1485         else if (head_need || tail_need)
1486                 I802_DEBUG_INC(local->tx_expand_skb_head);
1487         else
1488                 return 0;
1489 
1490         if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1491                 wiphy_debug(local->hw.wiphy,
1492                             "failed to reallocate TX buffer\n");
1493                 return -ENOMEM;
1494         }
1495 
1496         return 0;
1497 }
1498 
1499 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1500                     enum ieee80211_band band)
1501 {
1502         struct ieee80211_local *local = sdata->local;
1503         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1504         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1505         int headroom;
1506         bool may_encrypt;
1507 
1508         may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1509 
1510         headroom = local->tx_headroom;
1511         if (may_encrypt)
1512                 headroom += sdata->encrypt_headroom;
1513         headroom -= skb_headroom(skb);
1514         headroom = max_t(int, 0, headroom);
1515 
1516         if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1517                 ieee80211_free_txskb(&local->hw, skb);
1518                 return;
1519         }
1520 
1521         hdr = (struct ieee80211_hdr *) skb->data;
1522         info->control.vif = &sdata->vif;
1523 
1524         if (ieee80211_vif_is_mesh(&sdata->vif)) {
1525                 if (ieee80211_is_data(hdr->frame_control) &&
1526                     is_unicast_ether_addr(hdr->addr1)) {
1527                         if (mesh_nexthop_resolve(sdata, skb))
1528                                 return; /* skb queued: don't free */
1529                 } else {
1530                         ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1531                 }
1532         }
1533 
1534         ieee80211_set_qos_hdr(sdata, skb);
1535         ieee80211_tx(sdata, skb, false, band);
1536 }
1537 
1538 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1539 {
1540         struct ieee80211_radiotap_iterator iterator;
1541         struct ieee80211_radiotap_header *rthdr =
1542                 (struct ieee80211_radiotap_header *) skb->data;
1543         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1544         int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1545                                                    NULL);
1546         u16 txflags;
1547 
1548         info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1549                        IEEE80211_TX_CTL_DONTFRAG;
1550 
1551         /*
1552          * for every radiotap entry that is present
1553          * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1554          * entries present, or -EINVAL on error)
1555          */
1556 
1557         while (!ret) {
1558                 ret = ieee80211_radiotap_iterator_next(&iterator);
1559 
1560                 if (ret)
1561                         continue;
1562 
1563                 /* see if this argument is something we can use */
1564                 switch (iterator.this_arg_index) {
1565                 /*
1566                  * You must take care when dereferencing iterator.this_arg
1567                  * for multibyte types... the pointer is not aligned.  Use
1568                  * get_unaligned((type *)iterator.this_arg) to dereference
1569                  * iterator.this_arg for type "type" safely on all arches.
1570                 */
1571                 case IEEE80211_RADIOTAP_FLAGS:
1572                         if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1573                                 /*
1574                                  * this indicates that the skb we have been
1575                                  * handed has the 32-bit FCS CRC at the end...
1576                                  * we should react to that by snipping it off
1577                                  * because it will be recomputed and added
1578                                  * on transmission
1579                                  */
1580                                 if (skb->len < (iterator._max_length + FCS_LEN))
1581                                         return false;
1582 
1583                                 skb_trim(skb, skb->len - FCS_LEN);
1584                         }
1585                         if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1586                                 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1587                         if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1588                                 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1589                         break;
1590 
1591                 case IEEE80211_RADIOTAP_TX_FLAGS:
1592                         txflags = get_unaligned_le16(iterator.this_arg);
1593                         if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1594                                 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1595                         break;
1596 
1597                 /*
1598                  * Please update the file
1599                  * Documentation/networking/mac80211-injection.txt
1600                  * when parsing new fields here.
1601                  */
1602 
1603                 default:
1604                         break;
1605                 }
1606         }
1607 
1608         if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1609                 return false;
1610 
1611         /*
1612          * remove the radiotap header
1613          * iterator->_max_length was sanity-checked against
1614          * skb->len by iterator init
1615          */
1616         skb_pull(skb, iterator._max_length);
1617 
1618         return true;
1619 }
1620 
1621 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1622                                          struct net_device *dev)
1623 {
1624         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1625         struct ieee80211_chanctx_conf *chanctx_conf;
1626         struct ieee80211_radiotap_header *prthdr =
1627                 (struct ieee80211_radiotap_header *)skb->data;
1628         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1629         struct ieee80211_hdr *hdr;
1630         struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1631         struct cfg80211_chan_def *chandef;
1632         u16 len_rthdr;
1633         int hdrlen;
1634 
1635         /* check for not even having the fixed radiotap header part */
1636         if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1637                 goto fail; /* too short to be possibly valid */
1638 
1639         /* is it a header version we can trust to find length from? */
1640         if (unlikely(prthdr->it_version))
1641                 goto fail; /* only version 0 is supported */
1642 
1643         /* then there must be a radiotap header with a length we can use */
1644         len_rthdr = ieee80211_get_radiotap_len(skb->data);
1645 
1646         /* does the skb contain enough to deliver on the alleged length? */
1647         if (unlikely(skb->len < len_rthdr))
1648                 goto fail; /* skb too short for claimed rt header extent */
1649 
1650         /*
1651          * fix up the pointers accounting for the radiotap
1652          * header still being in there.  We are being given
1653          * a precooked IEEE80211 header so no need for
1654          * normal processing
1655          */
1656         skb_set_mac_header(skb, len_rthdr);
1657         /*
1658          * these are just fixed to the end of the rt area since we
1659          * don't have any better information and at this point, nobody cares
1660          */
1661         skb_set_network_header(skb, len_rthdr);
1662         skb_set_transport_header(skb, len_rthdr);
1663 
1664         if (skb->len < len_rthdr + 2)
1665                 goto fail;
1666 
1667         hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1668         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1669 
1670         if (skb->len < len_rthdr + hdrlen)
1671                 goto fail;
1672 
1673         /*
1674          * Initialize skb->protocol if the injected frame is a data frame
1675          * carrying a rfc1042 header
1676          */
1677         if (ieee80211_is_data(hdr->frame_control) &&
1678             skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1679                 u8 *payload = (u8 *)hdr + hdrlen;
1680 
1681                 if (ether_addr_equal(payload, rfc1042_header))
1682                         skb->protocol = cpu_to_be16((payload[6] << 8) |
1683                                                     payload[7]);
1684         }
1685 
1686         memset(info, 0, sizeof(*info));
1687 
1688         info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1689                       IEEE80211_TX_CTL_INJECTED;
1690 
1691         /* process and remove the injection radiotap header */
1692         if (!ieee80211_parse_tx_radiotap(skb))
1693                 goto fail;
1694 
1695         rcu_read_lock();
1696 
1697         /*
1698          * We process outgoing injected frames that have a local address
1699          * we handle as though they are non-injected frames.
1700          * This code here isn't entirely correct, the local MAC address
1701          * isn't always enough to find the interface to use; for proper
1702          * VLAN/WDS support we will need a different mechanism (which
1703          * likely isn't going to be monitor interfaces).
1704          */
1705         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1706 
1707         list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1708                 if (!ieee80211_sdata_running(tmp_sdata))
1709                         continue;
1710                 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1711                     tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1712                     tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1713                         continue;
1714                 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1715                         sdata = tmp_sdata;
1716                         break;
1717                 }
1718         }
1719 
1720         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1721         if (!chanctx_conf) {
1722                 tmp_sdata = rcu_dereference(local->monitor_sdata);
1723                 if (tmp_sdata)
1724                         chanctx_conf =
1725                                 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1726         }
1727 
1728         if (chanctx_conf)
1729                 chandef = &chanctx_conf->def;
1730         else if (!local->use_chanctx)
1731                 chandef = &local->_oper_chandef;
1732         else
1733                 goto fail_rcu;
1734 
1735         /*
1736          * Frame injection is not allowed if beaconing is not allowed
1737          * or if we need radar detection. Beaconing is usually not allowed when
1738          * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1739          * Passive scan is also used in world regulatory domains where
1740          * your country is not known and as such it should be treated as
1741          * NO TX unless the channel is explicitly allowed in which case
1742          * your current regulatory domain would not have the passive scan
1743          * flag.
1744          *
1745          * Since AP mode uses monitor interfaces to inject/TX management
1746          * frames we can make AP mode the exception to this rule once it
1747          * supports radar detection as its implementation can deal with
1748          * radar detection by itself. We can do that later by adding a
1749          * monitor flag interfaces used for AP support.
1750          */
1751         if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
1752                                      sdata->vif.type))
1753                 goto fail_rcu;
1754 
1755         ieee80211_xmit(sdata, skb, chandef->chan->band);
1756         rcu_read_unlock();
1757 
1758         return NETDEV_TX_OK;
1759 
1760 fail_rcu:
1761         rcu_read_unlock();
1762 fail:
1763         dev_kfree_skb(skb);
1764         return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1765 }
1766 
1767 /*
1768  * Measure Tx frame arrival time for Tx latency statistics calculation
1769  * A single Tx frame latency should be measured from when it is entering the
1770  * Kernel until we receive Tx complete confirmation indication and the skb is
1771  * freed.
1772  */
1773 static void ieee80211_tx_latency_start_msrmnt(struct ieee80211_local *local,
1774                                               struct sk_buff *skb)
1775 {
1776         struct ieee80211_tx_latency_bin_ranges *tx_latency;
1777 
1778         tx_latency = rcu_dereference(local->tx_latency);
1779         if (!tx_latency)
1780                 return;
1781         skb->tstamp = ktime_get();
1782 }
1783 
1784 /**
1785  * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1786  * subinterfaces (wlan#, WDS, and VLAN interfaces)
1787  * @skb: packet to be sent
1788  * @dev: incoming interface
1789  *
1790  * Returns: NETDEV_TX_OK both on success and on failure. On failure skb will
1791  *      be freed.
1792  *
1793  * This function takes in an Ethernet header and encapsulates it with suitable
1794  * IEEE 802.11 header based on which interface the packet is coming in. The
1795  * encapsulated packet will then be passed to master interface, wlan#.11, for
1796  * transmission (through low-level driver).
1797  */
1798 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1799                                     struct net_device *dev)
1800 {
1801         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1802         struct ieee80211_local *local = sdata->local;
1803         struct ieee80211_tx_info *info;
1804         int head_need;
1805         u16 ethertype, hdrlen,  meshhdrlen = 0;
1806         __le16 fc;
1807         struct ieee80211_hdr hdr;
1808         struct ieee80211s_hdr mesh_hdr __maybe_unused;
1809         struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1810         const u8 *encaps_data;
1811         int encaps_len, skip_header_bytes;
1812         int nh_pos, h_pos;
1813         struct sta_info *sta = NULL;
1814         bool wme_sta = false, authorized = false, tdls_auth = false;
1815         bool tdls_peer = false, tdls_setup_frame = false;
1816         bool multicast;
1817         u32 info_flags = 0;
1818         u16 info_id = 0;
1819         struct ieee80211_chanctx_conf *chanctx_conf;
1820         struct ieee80211_sub_if_data *ap_sdata;
1821         enum ieee80211_band band;
1822 
1823         if (unlikely(skb->len < ETH_HLEN))
1824                 goto fail;
1825 
1826         /* convert Ethernet header to proper 802.11 header (based on
1827          * operation mode) */
1828         ethertype = (skb->data[12] << 8) | skb->data[13];
1829         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1830 
1831         rcu_read_lock();
1832 
1833         /* Measure frame arrival for Tx latency statistics calculation */
1834         ieee80211_tx_latency_start_msrmnt(local, skb);
1835 
1836         switch (sdata->vif.type) {
1837         case NL80211_IFTYPE_AP_VLAN:
1838                 sta = rcu_dereference(sdata->u.vlan.sta);
1839                 if (sta) {
1840                         fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1841                         /* RA TA DA SA */
1842                         memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1843                         memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1844                         memcpy(hdr.addr3, skb->data, ETH_ALEN);
1845                         memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1846                         hdrlen = 30;
1847                         authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1848                         wme_sta = sta->sta.wme;
1849                 }
1850                 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1851                                         u.ap);
1852                 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
1853                 if (!chanctx_conf)
1854                         goto fail_rcu;
1855                 band = chanctx_conf->def.chan->band;
1856                 if (sta)
1857                         break;
1858                 /* fall through */
1859         case NL80211_IFTYPE_AP:
1860                 if (sdata->vif.type == NL80211_IFTYPE_AP)
1861                         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1862                 if (!chanctx_conf)
1863                         goto fail_rcu;
1864                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1865                 /* DA BSSID SA */
1866                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1867                 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1868                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1869                 hdrlen = 24;
1870                 band = chanctx_conf->def.chan->band;
1871                 break;
1872         case NL80211_IFTYPE_WDS:
1873                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1874                 /* RA TA DA SA */
1875                 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1876                 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1877                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1878                 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1879                 hdrlen = 30;
1880                 /*
1881                  * This is the exception! WDS style interfaces are prohibited
1882                  * when channel contexts are in used so this must be valid
1883                  */
1884                 band = local->hw.conf.chandef.chan->band;
1885                 break;
1886 #ifdef CONFIG_MAC80211_MESH
1887         case NL80211_IFTYPE_MESH_POINT:
1888                 if (!is_multicast_ether_addr(skb->data)) {
1889                         struct sta_info *next_hop;
1890                         bool mpp_lookup = true;
1891 
1892                         mpath = mesh_path_lookup(sdata, skb->data);
1893                         if (mpath) {
1894                                 mpp_lookup = false;
1895                                 next_hop = rcu_dereference(mpath->next_hop);
1896                                 if (!next_hop ||
1897                                     !(mpath->flags & (MESH_PATH_ACTIVE |
1898                                                       MESH_PATH_RESOLVING)))
1899                                         mpp_lookup = true;
1900                         }
1901 
1902                         if (mpp_lookup)
1903                                 mppath = mpp_path_lookup(sdata, skb->data);
1904 
1905                         if (mppath && mpath)
1906                                 mesh_path_del(mpath->sdata, mpath->dst);
1907                 }
1908 
1909                 /*
1910                  * Use address extension if it is a packet from
1911                  * another interface or if we know the destination
1912                  * is being proxied by a portal (i.e. portal address
1913                  * differs from proxied address)
1914                  */
1915                 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1916                     !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1917                         hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1918                                         skb->data, skb->data + ETH_ALEN);
1919                         meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
1920                                                                NULL, NULL);
1921                 } else {
1922                         /* DS -> MBSS (802.11-2012 13.11.3.3).
1923                          * For unicast with unknown forwarding information,
1924                          * destination might be in the MBSS or if that fails
1925                          * forwarded to another mesh gate. In either case
1926                          * resolution will be handled in ieee80211_xmit(), so
1927                          * leave the original DA. This also works for mcast */
1928                         const u8 *mesh_da = skb->data;
1929 
1930                         if (mppath)
1931                                 mesh_da = mppath->mpp;
1932                         else if (mpath)
1933                                 mesh_da = mpath->dst;
1934 
1935                         hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1936                                         mesh_da, sdata->vif.addr);
1937                         if (is_multicast_ether_addr(mesh_da))
1938                                 /* DA TA mSA AE:SA */
1939                                 meshhdrlen = ieee80211_new_mesh_header(
1940                                                 sdata, &mesh_hdr,
1941                                                 skb->data + ETH_ALEN, NULL);
1942                         else
1943                                 /* RA TA mDA mSA AE:DA SA */
1944                                 meshhdrlen = ieee80211_new_mesh_header(
1945                                                 sdata, &mesh_hdr, skb->data,
1946                                                 skb->data + ETH_ALEN);
1947 
1948                 }
1949                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1950                 if (!chanctx_conf)
1951                         goto fail_rcu;
1952                 band = chanctx_conf->def.chan->band;
1953                 break;
1954 #endif
1955         case NL80211_IFTYPE_STATION:
1956                 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1957                         sta = sta_info_get(sdata, skb->data);
1958                         if (sta) {
1959                                 authorized = test_sta_flag(sta,
1960                                                         WLAN_STA_AUTHORIZED);
1961                                 wme_sta = sta->sta.wme;
1962                                 tdls_peer = test_sta_flag(sta,
1963                                                           WLAN_STA_TDLS_PEER);
1964                                 tdls_auth = test_sta_flag(sta,
1965                                                 WLAN_STA_TDLS_PEER_AUTH);
1966                         }
1967 
1968                         if (tdls_peer)
1969                                 tdls_setup_frame =
1970                                         ethertype == ETH_P_TDLS &&
1971                                         skb->len > 14 &&
1972                                         skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
1973                 }
1974 
1975                 /*
1976                  * TDLS link during setup - throw out frames to peer. We allow
1977                  * TDLS-setup frames to unauthorized peers for the special case
1978                  * of a link teardown after a TDLS sta is removed due to being
1979                  * unreachable.
1980                  */
1981                 if (tdls_peer && !tdls_auth && !tdls_setup_frame)
1982                         goto fail_rcu;
1983 
1984                 /* send direct packets to authorized TDLS peers */
1985                 if (tdls_peer && tdls_auth) {
1986                         /* DA SA BSSID */
1987                         memcpy(hdr.addr1, skb->data, ETH_ALEN);
1988                         memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1989                         memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1990                         hdrlen = 24;
1991                 }  else if (sdata->u.mgd.use_4addr &&
1992                             cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1993                         fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1994                                           IEEE80211_FCTL_TODS);
1995                         /* RA TA DA SA */
1996                         memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1997                         memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1998                         memcpy(hdr.addr3, skb->data, ETH_ALEN);
1999                         memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2000                         hdrlen = 30;
2001                 } else {
2002                         fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2003                         /* BSSID SA DA */
2004                         memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2005                         memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2006                         memcpy(hdr.addr3, skb->data, ETH_ALEN);
2007                         hdrlen = 24;
2008                 }
2009                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2010                 if (!chanctx_conf)
2011                         goto fail_rcu;
2012                 band = chanctx_conf->def.chan->band;
2013                 break;
2014         case NL80211_IFTYPE_ADHOC:
2015                 /* DA SA BSSID */
2016                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2017                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2018                 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2019                 hdrlen = 24;
2020                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2021                 if (!chanctx_conf)
2022                         goto fail_rcu;
2023                 band = chanctx_conf->def.chan->band;
2024                 break;
2025         default:
2026                 goto fail_rcu;
2027         }
2028 
2029         /*
2030          * There's no need to try to look up the destination
2031          * if it is a multicast address (which can only happen
2032          * in AP mode)
2033          */
2034         multicast = is_multicast_ether_addr(hdr.addr1);
2035         if (!multicast) {
2036                 sta = sta_info_get(sdata, hdr.addr1);
2037                 if (sta) {
2038                         authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2039                         wme_sta = sta->sta.wme;
2040                 }
2041         }
2042 
2043         /* For mesh, the use of the QoS header is mandatory */
2044         if (ieee80211_vif_is_mesh(&sdata->vif))
2045                 wme_sta = true;
2046 
2047         /* receiver and we are QoS enabled, use a QoS type frame */
2048         if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
2049                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2050                 hdrlen += 2;
2051         }
2052 
2053         /*
2054          * Drop unicast frames to unauthorised stations unless they are
2055          * EAPOL frames from the local station.
2056          */
2057         if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2058                      !multicast && !authorized &&
2059                      (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2060                       !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2061 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2062                 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2063                                     dev->name, hdr.addr1);
2064 #endif
2065 
2066                 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2067 
2068                 goto fail_rcu;
2069         }
2070 
2071         if (unlikely(!multicast && skb->sk &&
2072                      skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2073                 struct sk_buff *ack_skb = skb_clone_sk(skb);
2074 
2075                 if (ack_skb) {
2076                         unsigned long flags;
2077                         int id;
2078 
2079                         spin_lock_irqsave(&local->ack_status_lock, flags);
2080                         id = idr_alloc(&local->ack_status_frames, ack_skb,
2081                                        1, 0x10000, GFP_ATOMIC);
2082                         spin_unlock_irqrestore(&local->ack_status_lock, flags);
2083 
2084                         if (id >= 0) {
2085                                 info_id = id;
2086                                 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2087                         } else {
2088                                 kfree_skb(ack_skb);
2089                         }
2090                 }
2091         }
2092 
2093         /*
2094          * If the skb is shared we need to obtain our own copy.
2095          */
2096         if (skb_shared(skb)) {
2097                 struct sk_buff *tmp_skb = skb;
2098 
2099                 /* can't happen -- skb is a clone if info_id != 0 */
2100                 WARN_ON(info_id);
2101 
2102                 skb = skb_clone(skb, GFP_ATOMIC);
2103                 kfree_skb(tmp_skb);
2104 
2105                 if (!skb)
2106                         goto fail_rcu;
2107         }
2108 
2109         hdr.frame_control = fc;
2110         hdr.duration_id = 0;
2111         hdr.seq_ctrl = 0;
2112 
2113         skip_header_bytes = ETH_HLEN;
2114         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2115                 encaps_data = bridge_tunnel_header;
2116                 encaps_len = sizeof(bridge_tunnel_header);
2117                 skip_header_bytes -= 2;
2118         } else if (ethertype >= ETH_P_802_3_MIN) {
2119                 encaps_data = rfc1042_header;
2120                 encaps_len = sizeof(rfc1042_header);
2121                 skip_header_bytes -= 2;
2122         } else {
2123                 encaps_data = NULL;
2124                 encaps_len = 0;
2125         }
2126 
2127         nh_pos = skb_network_header(skb) - skb->data;
2128         h_pos = skb_transport_header(skb) - skb->data;
2129 
2130         skb_pull(skb, skip_header_bytes);
2131         nh_pos -= skip_header_bytes;
2132         h_pos -= skip_header_bytes;
2133 
2134         head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2135 
2136         /*
2137          * So we need to modify the skb header and hence need a copy of
2138          * that. The head_need variable above doesn't, so far, include
2139          * the needed header space that we don't need right away. If we
2140          * can, then we don't reallocate right now but only after the
2141          * frame arrives at the master device (if it does...)
2142          *
2143          * If we cannot, however, then we will reallocate to include all
2144          * the ever needed space. Also, if we need to reallocate it anyway,
2145          * make it big enough for everything we may ever need.
2146          */
2147 
2148         if (head_need > 0 || skb_cloned(skb)) {
2149                 head_need += sdata->encrypt_headroom;
2150                 head_need += local->tx_headroom;
2151                 head_need = max_t(int, 0, head_need);
2152                 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2153                         ieee80211_free_txskb(&local->hw, skb);
2154                         skb = NULL;
2155                         goto fail_rcu;
2156                 }
2157         }
2158 
2159         if (encaps_data) {
2160                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2161                 nh_pos += encaps_len;
2162                 h_pos += encaps_len;
2163         }
2164 
2165 #ifdef CONFIG_MAC80211_MESH
2166         if (meshhdrlen > 0) {
2167                 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2168                 nh_pos += meshhdrlen;
2169                 h_pos += meshhdrlen;
2170         }
2171 #endif
2172 
2173         if (ieee80211_is_data_qos(fc)) {
2174                 __le16 *qos_control;
2175 
2176                 qos_control = (__le16 *) skb_push(skb, 2);
2177                 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2178                 /*
2179                  * Maybe we could actually set some fields here, for now just
2180                  * initialise to zero to indicate no special operation.
2181                  */
2182                 *qos_control = 0;
2183         } else
2184                 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2185 
2186         nh_pos += hdrlen;
2187         h_pos += hdrlen;
2188 
2189         dev->stats.tx_packets++;
2190         dev->stats.tx_bytes += skb->len;
2191 
2192         /* Update skb pointers to various headers since this modified frame
2193          * is going to go through Linux networking code that may potentially
2194          * need things like pointer to IP header. */
2195         skb_set_mac_header(skb, 0);
2196         skb_set_network_header(skb, nh_pos);
2197         skb_set_transport_header(skb, h_pos);
2198 
2199         info = IEEE80211_SKB_CB(skb);
2200         memset(info, 0, sizeof(*info));
2201 
2202         dev->trans_start = jiffies;
2203 
2204         info->flags = info_flags;
2205         info->ack_frame_id = info_id;
2206 
2207         ieee80211_xmit(sdata, skb, band);
2208         rcu_read_unlock();
2209 
2210         return NETDEV_TX_OK;
2211 
2212  fail_rcu:
2213         rcu_read_unlock();
2214  fail:
2215         dev_kfree_skb(skb);
2216         return NETDEV_TX_OK;
2217 }
2218 
2219 
2220 /*
2221  * ieee80211_clear_tx_pending may not be called in a context where
2222  * it is possible that it packets could come in again.
2223  */
2224 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2225 {
2226         struct sk_buff *skb;
2227         int i;
2228 
2229         for (i = 0; i < local->hw.queues; i++) {
2230                 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2231                         ieee80211_free_txskb(&local->hw, skb);
2232         }
2233 }
2234 
2235 /*
2236  * Returns false if the frame couldn't be transmitted but was queued instead,
2237  * which in this case means re-queued -- take as an indication to stop sending
2238  * more pending frames.
2239  */
2240 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2241                                      struct sk_buff *skb)
2242 {
2243         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2244         struct ieee80211_sub_if_data *sdata;
2245         struct sta_info *sta;
2246         struct ieee80211_hdr *hdr;
2247         bool result;
2248         struct ieee80211_chanctx_conf *chanctx_conf;
2249 
2250         sdata = vif_to_sdata(info->control.vif);
2251 
2252         if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2253                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2254                 if (unlikely(!chanctx_conf)) {
2255                         dev_kfree_skb(skb);
2256                         return true;
2257                 }
2258                 result = ieee80211_tx(sdata, skb, true,
2259                                       chanctx_conf->def.chan->band);
2260         } else {
2261                 struct sk_buff_head skbs;
2262 
2263                 __skb_queue_head_init(&skbs);
2264                 __skb_queue_tail(&skbs, skb);
2265 
2266                 hdr = (struct ieee80211_hdr *)skb->data;
2267                 sta = sta_info_get(sdata, hdr->addr1);
2268 
2269                 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2270         }
2271 
2272         return result;
2273 }
2274 
2275 /*
2276  * Transmit all pending packets. Called from tasklet.
2277  */
2278 void ieee80211_tx_pending(unsigned long data)
2279 {
2280         struct ieee80211_local *local = (struct ieee80211_local *)data;
2281         unsigned long flags;
2282         int i;
2283         bool txok;
2284 
2285         rcu_read_lock();
2286 
2287         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2288         for (i = 0; i < local->hw.queues; i++) {
2289                 /*
2290                  * If queue is stopped by something other than due to pending
2291                  * frames, or we have no pending frames, proceed to next queue.
2292                  */
2293                 if (local->queue_stop_reasons[i] ||
2294                     skb_queue_empty(&local->pending[i]))
2295                         continue;
2296 
2297                 while (!skb_queue_empty(&local->pending[i])) {
2298                         struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2299                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2300 
2301                         if (WARN_ON(!info->control.vif)) {
2302                                 ieee80211_free_txskb(&local->hw, skb);
2303                                 continue;
2304                         }
2305 
2306                         spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2307                                                 flags);
2308 
2309                         txok = ieee80211_tx_pending_skb(local, skb);
2310                         spin_lock_irqsave(&local->queue_stop_reason_lock,
2311                                           flags);
2312                         if (!txok)
2313                                 break;
2314                 }
2315 
2316                 if (skb_queue_empty(&local->pending[i]))
2317                         ieee80211_propagate_queue_wake(local, i);
2318         }
2319         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2320 
2321         rcu_read_unlock();
2322 }
2323 
2324 /* functions for drivers to get certain frames */
2325 
2326 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2327                                        struct ps_data *ps, struct sk_buff *skb,
2328                                        bool is_template)
2329 {
2330         u8 *pos, *tim;
2331         int aid0 = 0;
2332         int i, have_bits = 0, n1, n2;
2333 
2334         /* Generate bitmap for TIM only if there are any STAs in power save
2335          * mode. */
2336         if (atomic_read(&ps->num_sta_ps) > 0)
2337                 /* in the hope that this is faster than
2338                  * checking byte-for-byte */
2339                 have_bits = !bitmap_empty((unsigned long *)ps->tim,
2340                                           IEEE80211_MAX_AID+1);
2341         if (!is_template) {
2342                 if (ps->dtim_count == 0)
2343                         ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2344                 else
2345                         ps->dtim_count--;
2346         }
2347 
2348         tim = pos = (u8 *) skb_put(skb, 6);
2349         *pos++ = WLAN_EID_TIM;
2350         *pos++ = 4;
2351         *pos++ = ps->dtim_count;
2352         *pos++ = sdata->vif.bss_conf.dtim_period;
2353 
2354         if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2355                 aid0 = 1;
2356 
2357         ps->dtim_bc_mc = aid0 == 1;
2358 
2359         if (have_bits) {
2360                 /* Find largest even number N1 so that bits numbered 1 through
2361                  * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2362                  * (N2 + 1) x 8 through 2007 are 0. */
2363                 n1 = 0;
2364                 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2365                         if (ps->tim[i]) {
2366                                 n1 = i & 0xfe;
2367                                 break;
2368                         }
2369                 }
2370                 n2 = n1;
2371                 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2372                         if (ps->tim[i]) {
2373                                 n2 = i;
2374                                 break;
2375                         }
2376                 }
2377 
2378                 /* Bitmap control */
2379                 *pos++ = n1 | aid0;
2380                 /* Part Virt Bitmap */
2381                 skb_put(skb, n2 - n1);
2382                 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2383 
2384                 tim[1] = n2 - n1 + 4;
2385         } else {
2386                 *pos++ = aid0; /* Bitmap control */
2387                 *pos++ = 0; /* Part Virt Bitmap */
2388         }
2389 }
2390 
2391 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2392                                     struct ps_data *ps, struct sk_buff *skb,
2393                                     bool is_template)
2394 {
2395         struct ieee80211_local *local = sdata->local;
2396 
2397         /*
2398          * Not very nice, but we want to allow the driver to call
2399          * ieee80211_beacon_get() as a response to the set_tim()
2400          * callback. That, however, is already invoked under the
2401          * sta_lock to guarantee consistent and race-free update
2402          * of the tim bitmap in mac80211 and the driver.
2403          */
2404         if (local->tim_in_locked_section) {
2405                 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
2406         } else {
2407                 spin_lock_bh(&local->tim_lock);
2408                 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
2409                 spin_unlock_bh(&local->tim_lock);
2410         }
2411 
2412         return 0;
2413 }
2414 
2415 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
2416                               struct beacon_data *beacon)
2417 {
2418         struct probe_resp *resp;
2419         u8 *beacon_data;
2420         size_t beacon_data_len;
2421         int i;
2422         u8 count = beacon->csa_current_counter;
2423 
2424         switch (sdata->vif.type) {
2425         case NL80211_IFTYPE_AP:
2426                 beacon_data = beacon->tail;
2427                 beacon_data_len = beacon->tail_len;
2428                 break;
2429         case NL80211_IFTYPE_ADHOC:
2430                 beacon_data = beacon->head;
2431                 beacon_data_len = beacon->head_len;
2432                 break;
2433         case NL80211_IFTYPE_MESH_POINT:
2434                 beacon_data = beacon->head;
2435                 beacon_data_len = beacon->head_len;
2436                 break;
2437         default:
2438                 return;
2439         }
2440 
2441         rcu_read_lock();
2442         for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
2443                 resp = rcu_dereference(sdata->u.ap.probe_resp);
2444 
2445                 if (beacon->csa_counter_offsets[i]) {
2446                         if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
2447                                          beacon_data_len)) {
2448                                 rcu_read_unlock();
2449                                 return;
2450                         }
2451 
2452                         beacon_data[beacon->csa_counter_offsets[i]] = count;
2453                 }
2454 
2455                 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
2456                         resp->data[resp->csa_counter_offsets[i]] = count;
2457         }
2458         rcu_read_unlock();
2459 }
2460 
2461 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
2462 {
2463         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2464         struct beacon_data *beacon = NULL;
2465         u8 count = 0;
2466 
2467         rcu_read_lock();
2468 
2469         if (sdata->vif.type == NL80211_IFTYPE_AP)
2470                 beacon = rcu_dereference(sdata->u.ap.beacon);
2471         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2472                 beacon = rcu_dereference(sdata->u.ibss.presp);
2473         else if (ieee80211_vif_is_mesh(&sdata->vif))
2474                 beacon = rcu_dereference(sdata->u.mesh.beacon);
2475 
2476         if (!beacon)
2477                 goto unlock;
2478 
2479         beacon->csa_current_counter--;
2480 
2481         /* the counter should never reach 0 */
2482         WARN_ON_ONCE(!beacon->csa_current_counter);
2483         count = beacon->csa_current_counter;
2484 
2485 unlock:
2486         rcu_read_unlock();
2487         return count;
2488 }
2489 EXPORT_SYMBOL(ieee80211_csa_update_counter);
2490 
2491 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
2492 {
2493         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2494         struct beacon_data *beacon = NULL;
2495         u8 *beacon_data;
2496         size_t beacon_data_len;
2497         int ret = false;
2498 
2499         if (!ieee80211_sdata_running(sdata))
2500                 return false;
2501 
2502         rcu_read_lock();
2503         if (vif->type == NL80211_IFTYPE_AP) {
2504                 struct ieee80211_if_ap *ap = &sdata->u.ap;
2505 
2506                 beacon = rcu_dereference(ap->beacon);
2507                 if (WARN_ON(!beacon || !beacon->tail))
2508                         goto out;
2509                 beacon_data = beacon->tail;
2510                 beacon_data_len = beacon->tail_len;
2511         } else if (vif->type == NL80211_IFTYPE_ADHOC) {
2512                 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2513 
2514                 beacon = rcu_dereference(ifibss->presp);
2515                 if (!beacon)
2516                         goto out;
2517 
2518                 beacon_data = beacon->head;
2519                 beacon_data_len = beacon->head_len;
2520         } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
2521                 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2522 
2523                 beacon = rcu_dereference(ifmsh->beacon);
2524                 if (!beacon)
2525                         goto out;
2526 
2527                 beacon_data = beacon->head;
2528                 beacon_data_len = beacon->head_len;
2529         } else {
2530                 WARN_ON(1);
2531                 goto out;
2532         }
2533 
2534         if (!beacon->csa_counter_offsets[0])
2535                 goto out;
2536 
2537         if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
2538                 goto out;
2539 
2540         if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
2541                 ret = true;
2542  out:
2543         rcu_read_unlock();
2544 
2545         return ret;
2546 }
2547 EXPORT_SYMBOL(ieee80211_csa_is_complete);
2548 
2549 static struct sk_buff *
2550 __ieee80211_beacon_get(struct ieee80211_hw *hw,
2551                        struct ieee80211_vif *vif,
2552                        struct ieee80211_mutable_offsets *offs,
2553                        bool is_template)
2554 {
2555         struct ieee80211_local *local = hw_to_local(hw);
2556         struct beacon_data *beacon = NULL;
2557         struct sk_buff *skb = NULL;
2558         struct ieee80211_tx_info *info;
2559         struct ieee80211_sub_if_data *sdata = NULL;
2560         enum ieee80211_band band;
2561         struct ieee80211_tx_rate_control txrc;
2562         struct ieee80211_chanctx_conf *chanctx_conf;
2563         int csa_off_base = 0;
2564 
2565         rcu_read_lock();
2566 
2567         sdata = vif_to_sdata(vif);
2568         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2569 
2570         if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2571                 goto out;
2572 
2573         if (offs)
2574                 memset(offs, 0, sizeof(*offs));
2575 
2576         if (sdata->vif.type == NL80211_IFTYPE_AP) {
2577                 struct ieee80211_if_ap *ap = &sdata->u.ap;
2578 
2579                 beacon = rcu_dereference(ap->beacon);
2580                 if (beacon) {
2581                         if (beacon->csa_counter_offsets[0]) {
2582                                 if (!is_template)
2583                                         ieee80211_csa_update_counter(vif);
2584 
2585                                 ieee80211_set_csa(sdata, beacon);
2586                         }
2587 
2588                         /*
2589                          * headroom, head length,
2590                          * tail length and maximum TIM length
2591                          */
2592                         skb = dev_alloc_skb(local->tx_headroom +
2593                                             beacon->head_len +
2594                                             beacon->tail_len + 256 +
2595                                             local->hw.extra_beacon_tailroom);
2596                         if (!skb)
2597                                 goto out;
2598 
2599                         skb_reserve(skb, local->tx_headroom);
2600                         memcpy(skb_put(skb, beacon->head_len), beacon->head,
2601                                beacon->head_len);
2602 
2603                         ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
2604                                                  is_template);
2605 
2606                         if (offs) {
2607                                 offs->tim_offset = beacon->head_len;
2608                                 offs->tim_length = skb->len - beacon->head_len;
2609 
2610                                 /* for AP the csa offsets are from tail */
2611                                 csa_off_base = skb->len;
2612                         }
2613 
2614                         if (beacon->tail)
2615                                 memcpy(skb_put(skb, beacon->tail_len),
2616                                        beacon->tail, beacon->tail_len);
2617                 } else
2618                         goto out;
2619         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2620                 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2621                 struct ieee80211_hdr *hdr;
2622 
2623                 beacon = rcu_dereference(ifibss->presp);
2624                 if (!beacon)
2625                         goto out;
2626 
2627                 if (beacon->csa_counter_offsets[0]) {
2628                         if (!is_template)
2629                                 ieee80211_csa_update_counter(vif);
2630 
2631                         ieee80211_set_csa(sdata, beacon);
2632                 }
2633 
2634                 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
2635                                     local->hw.extra_beacon_tailroom);
2636                 if (!skb)
2637                         goto out;
2638                 skb_reserve(skb, local->tx_headroom);
2639                 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2640                        beacon->head_len);
2641 
2642                 hdr = (struct ieee80211_hdr *) skb->data;
2643                 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2644                                                  IEEE80211_STYPE_BEACON);
2645         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2646                 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2647 
2648                 beacon = rcu_dereference(ifmsh->beacon);
2649                 if (!beacon)
2650                         goto out;
2651 
2652                 if (beacon->csa_counter_offsets[0]) {
2653                         if (!is_template)
2654                                 /* TODO: For mesh csa_counter is in TU, so
2655                                  * decrementing it by one isn't correct, but
2656                                  * for now we leave it consistent with overall
2657                                  * mac80211's behavior.
2658                                  */
2659                                 ieee80211_csa_update_counter(vif);
2660 
2661                         ieee80211_set_csa(sdata, beacon);
2662                 }
2663 
2664                 if (ifmsh->sync_ops)
2665                         ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
2666 
2667                 skb = dev_alloc_skb(local->tx_headroom +
2668                                     beacon->head_len +
2669                                     256 + /* TIM IE */
2670                                     beacon->tail_len +
2671                                     local->hw.extra_beacon_tailroom);
2672                 if (!skb)
2673                         goto out;
2674                 skb_reserve(skb, local->tx_headroom);
2675                 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2676                        beacon->head_len);
2677                 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
2678 
2679                 if (offs) {
2680                         offs->tim_offset = beacon->head_len;
2681                         offs->tim_length = skb->len - beacon->head_len;
2682                 }
2683 
2684                 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
2685                        beacon->tail_len);
2686         } else {
2687                 WARN_ON(1);
2688                 goto out;
2689         }
2690 
2691         /* CSA offsets */
2692         if (offs && beacon) {
2693                 int i;
2694 
2695                 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
2696                         u16 csa_off = beacon->csa_counter_offsets[i];
2697 
2698                         if (!csa_off)
2699                                 continue;
2700 
2701                         offs->csa_counter_offs[i] = csa_off_base + csa_off;
2702                 }
2703         }
2704 
2705         band = chanctx_conf->def.chan->band;
2706 
2707         info = IEEE80211_SKB_CB(skb);
2708 
2709         info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2710         info->flags |= IEEE80211_TX_CTL_NO_ACK;
2711         info->band = band;
2712 
2713         memset(&txrc, 0, sizeof(txrc));
2714         txrc.hw = hw;
2715         txrc.sband = local->hw.wiphy->bands[band];
2716         txrc.bss_conf = &sdata->vif.bss_conf;
2717         txrc.skb = skb;
2718         txrc.reported_rate.idx = -1;
2719         txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2720         if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2721                 txrc.max_rate_idx = -1;
2722         else
2723                 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2724         txrc.bss = true;
2725         rate_control_get_rate(sdata, NULL, &txrc);
2726 
2727         info->control.vif = vif;
2728 
2729         info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2730                         IEEE80211_TX_CTL_ASSIGN_SEQ |
2731                         IEEE80211_TX_CTL_FIRST_FRAGMENT;
2732  out:
2733         rcu_read_unlock();
2734         return skb;
2735 
2736 }
2737 
2738 struct sk_buff *
2739 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
2740                               struct ieee80211_vif *vif,
2741                               struct ieee80211_mutable_offsets *offs)
2742 {
2743         return __ieee80211_beacon_get(hw, vif, offs, true);
2744 }
2745 EXPORT_SYMBOL(ieee80211_beacon_get_template);
2746 
2747 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2748                                          struct ieee80211_vif *vif,
2749                                          u16 *tim_offset, u16 *tim_length)
2750 {
2751         struct ieee80211_mutable_offsets offs = {};
2752         struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
2753 
2754         if (tim_offset)
2755                 *tim_offset = offs.tim_offset;
2756 
2757         if (tim_length)
2758                 *tim_length = offs.tim_length;
2759 
2760         return bcn;
2761 }
2762 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2763 
2764 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2765                                         struct ieee80211_vif *vif)
2766 {
2767         struct ieee80211_if_ap *ap = NULL;
2768         struct sk_buff *skb = NULL;
2769         struct probe_resp *presp = NULL;
2770         struct ieee80211_hdr *hdr;
2771         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2772 
2773         if (sdata->vif.type != NL80211_IFTYPE_AP)
2774                 return NULL;
2775 
2776         rcu_read_lock();
2777 
2778         ap = &sdata->u.ap;
2779         presp = rcu_dereference(ap->probe_resp);
2780         if (!presp)
2781                 goto out;
2782 
2783         skb = dev_alloc_skb(presp->len);
2784         if (!skb)
2785                 goto out;
2786 
2787         memcpy(skb_put(skb, presp->len), presp->data, presp->len);
2788 
2789         hdr = (struct ieee80211_hdr *) skb->data;
2790         memset(hdr->addr1, 0, sizeof(hdr->addr1));
2791 
2792 out:
2793         rcu_read_unlock();
2794         return skb;
2795 }
2796 EXPORT_SYMBOL(ieee80211_proberesp_get);
2797 
2798 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2799                                      struct ieee80211_vif *vif)
2800 {
2801         struct ieee80211_sub_if_data *sdata;
2802         struct ieee80211_if_managed *ifmgd;
2803         struct ieee80211_pspoll *pspoll;
2804         struct ieee80211_local *local;
2805         struct sk_buff *skb;
2806 
2807         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2808                 return NULL;
2809 
2810         sdata = vif_to_sdata(vif);
2811         ifmgd = &sdata->u.mgd;
2812         local = sdata->local;
2813 
2814         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2815         if (!skb)
2816                 return NULL;
2817 
2818         skb_reserve(skb, local->hw.extra_tx_headroom);
2819 
2820         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2821         memset(pspoll, 0, sizeof(*pspoll));
2822         pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2823                                             IEEE80211_STYPE_PSPOLL);
2824         pspoll->aid = cpu_to_le16(ifmgd->aid);
2825 
2826         /* aid in PS-Poll has its two MSBs each set to 1 */
2827         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2828 
2829         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2830         memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2831 
2832         return skb;
2833 }
2834 EXPORT_SYMBOL(ieee80211_pspoll_get);
2835 
2836 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2837                                        struct ieee80211_vif *vif)
2838 {
2839         struct ieee80211_hdr_3addr *nullfunc;
2840         struct ieee80211_sub_if_data *sdata;
2841         struct ieee80211_if_managed *ifmgd;
2842         struct ieee80211_local *local;
2843         struct sk_buff *skb;
2844 
2845         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2846                 return NULL;
2847 
2848         sdata = vif_to_sdata(vif);
2849         ifmgd = &sdata->u.mgd;
2850         local = sdata->local;
2851 
2852         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2853         if (!skb)
2854                 return NULL;
2855 
2856         skb_reserve(skb, local->hw.extra_tx_headroom);
2857 
2858         nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2859                                                           sizeof(*nullfunc));
2860         memset(nullfunc, 0, sizeof(*nullfunc));
2861         nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2862                                               IEEE80211_STYPE_NULLFUNC |
2863                                               IEEE80211_FCTL_TODS);
2864         memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2865         memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2866         memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2867 
2868         return skb;
2869 }
2870 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2871 
2872 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2873                                        struct ieee80211_vif *vif,
2874                                        const u8 *ssid, size_t ssid_len,
2875                                        size_t tailroom)
2876 {
2877         struct ieee80211_sub_if_data *sdata;
2878         struct ieee80211_local *local;
2879         struct ieee80211_hdr_3addr *hdr;
2880         struct sk_buff *skb;
2881         size_t ie_ssid_len;
2882         u8 *pos;
2883 
2884         sdata = vif_to_sdata(vif);
2885         local = sdata->local;
2886         ie_ssid_len = 2 + ssid_len;
2887 
2888         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2889                             ie_ssid_len + tailroom);
2890         if (!skb)
2891                 return NULL;
2892 
2893         skb_reserve(skb, local->hw.extra_tx_headroom);
2894 
2895         hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2896         memset(hdr, 0, sizeof(*hdr));
2897         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2898                                          IEEE80211_STYPE_PROBE_REQ);
2899         eth_broadcast_addr(hdr->addr1);
2900         memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2901         eth_broadcast_addr(hdr->addr3);
2902 
2903         pos = skb_put(skb, ie_ssid_len);
2904         *pos++ = WLAN_EID_SSID;
2905         *pos++ = ssid_len;
2906         if (ssid_len)
2907                 memcpy(pos, ssid, ssid_len);
2908         pos += ssid_len;
2909 
2910         return skb;
2911 }
2912 EXPORT_SYMBOL(ieee80211_probereq_get);
2913 
2914 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2915                        const void *frame, size_t frame_len,
2916                        const struct ieee80211_tx_info *frame_txctl,
2917                        struct ieee80211_rts *rts)
2918 {
2919         const struct ieee80211_hdr *hdr = frame;
2920 
2921         rts->frame_control =
2922             cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2923         rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2924                                                frame_txctl);
2925         memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2926         memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2927 }
2928 EXPORT_SYMBOL(ieee80211_rts_get);
2929 
2930 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2931                              const void *frame, size_t frame_len,
2932                              const struct ieee80211_tx_info *frame_txctl,
2933                              struct ieee80211_cts *cts)
2934 {
2935         const struct ieee80211_hdr *hdr = frame;
2936 
2937         cts->frame_control =
2938             cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2939         cts->duration = ieee80211_ctstoself_duration(hw, vif,
2940                                                      frame_len, frame_txctl);
2941         memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2942 }
2943 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2944 
2945 struct sk_buff *
2946 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2947                           struct ieee80211_vif *vif)
2948 {
2949         struct ieee80211_local *local = hw_to_local(hw);
2950         struct sk_buff *skb = NULL;
2951         struct ieee80211_tx_data tx;
2952         struct ieee80211_sub_if_data *sdata;
2953         struct ps_data *ps;
2954         struct ieee80211_tx_info *info;
2955         struct ieee80211_chanctx_conf *chanctx_conf;
2956 
2957         sdata = vif_to_sdata(vif);
2958 
2959         rcu_read_lock();
2960         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2961 
2962         if (!chanctx_conf)
2963                 goto out;
2964 
2965         if (sdata->vif.type == NL80211_IFTYPE_AP) {
2966                 struct beacon_data *beacon =
2967                                 rcu_dereference(sdata->u.ap.beacon);
2968 
2969                 if (!beacon || !beacon->head)
2970                         goto out;
2971 
2972                 ps = &sdata->u.ap.ps;
2973         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2974                 ps = &sdata->u.mesh.ps;
2975         } else {
2976                 goto out;
2977         }
2978 
2979         if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
2980                 goto out; /* send buffered bc/mc only after DTIM beacon */
2981 
2982         while (1) {
2983                 skb = skb_dequeue(&ps->bc_buf);
2984                 if (!skb)
2985                         goto out;
2986                 local->total_ps_buffered--;
2987 
2988                 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
2989                         struct ieee80211_hdr *hdr =
2990                                 (struct ieee80211_hdr *) skb->data;
2991                         /* more buffered multicast/broadcast frames ==> set
2992                          * MoreData flag in IEEE 802.11 header to inform PS
2993                          * STAs */
2994                         hdr->frame_control |=
2995                                 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2996                 }
2997 
2998                 if (sdata->vif.type == NL80211_IFTYPE_AP)
2999                         sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
3000                 if (!ieee80211_tx_prepare(sdata, &tx, skb))
3001                         break;
3002                 ieee80211_free_txskb(hw, skb);
3003         }
3004 
3005         info = IEEE80211_SKB_CB(skb);
3006 
3007         tx.flags |= IEEE80211_TX_PS_BUFFERED;
3008         info->band = chanctx_conf->def.chan->band;
3009 
3010         if (invoke_tx_handlers(&tx))
3011                 skb = NULL;
3012  out:
3013         rcu_read_unlock();
3014 
3015         return skb;
3016 }
3017 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3018 
3019 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
3020                                  struct sk_buff *skb, int tid,
3021                                  enum ieee80211_band band)
3022 {
3023         int ac = ieee802_1d_to_ac[tid & 7];
3024 
3025         skb_set_mac_header(skb, 0);
3026         skb_set_network_header(skb, 0);
3027         skb_set_transport_header(skb, 0);
3028 
3029         skb_set_queue_mapping(skb, ac);
3030         skb->priority = tid;
3031 
3032         skb->dev = sdata->dev;
3033 
3034         /*
3035          * The other path calling ieee80211_xmit is from the tasklet,
3036          * and while we can handle concurrent transmissions locking
3037          * requirements are that we do not come into tx with bhs on.
3038          */
3039         local_bh_disable();
3040         ieee80211_xmit(sdata, skb, band);
3041         local_bh_enable();
3042 }
3043 

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