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

Version: ~ [ linux-5.4-rc3 ] ~ [ linux-5.3.6 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.79 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.149 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.196 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.196 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.75 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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 <net/net_namespace.h>
 24 #include <net/ieee80211_radiotap.h>
 25 #include <net/cfg80211.h>
 26 #include <net/mac80211.h>
 27 #include <net/codel.h>
 28 #include <net/codel_impl.h>
 29 #include <asm/unaligned.h>
 30 #include <net/fq_impl.h>
 31 
 32 #include "ieee80211_i.h"
 33 #include "driver-ops.h"
 34 #include "led.h"
 35 #include "mesh.h"
 36 #include "wep.h"
 37 #include "wpa.h"
 38 #include "wme.h"
 39 #include "rate.h"
 40 
 41 /* misc utils */
 42 
 43 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
 44 {
 45         struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
 46 
 47         u64_stats_update_begin(&tstats->syncp);
 48         tstats->tx_packets++;
 49         tstats->tx_bytes += len;
 50         u64_stats_update_end(&tstats->syncp);
 51 }
 52 
 53 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
 54                                  struct sk_buff *skb, int group_addr,
 55                                  int next_frag_len)
 56 {
 57         int rate, mrate, erp, dur, i, shift = 0;
 58         struct ieee80211_rate *txrate;
 59         struct ieee80211_local *local = tx->local;
 60         struct ieee80211_supported_band *sband;
 61         struct ieee80211_hdr *hdr;
 62         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 63         struct ieee80211_chanctx_conf *chanctx_conf;
 64         u32 rate_flags = 0;
 65 
 66         rcu_read_lock();
 67         chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
 68         if (chanctx_conf) {
 69                 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
 70                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 71         }
 72         rcu_read_unlock();
 73 
 74         /* assume HW handles this */
 75         if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
 76                 return 0;
 77 
 78         /* uh huh? */
 79         if (WARN_ON_ONCE(tx->rate.idx < 0))
 80                 return 0;
 81 
 82         sband = local->hw.wiphy->bands[info->band];
 83         txrate = &sband->bitrates[tx->rate.idx];
 84 
 85         erp = txrate->flags & IEEE80211_RATE_ERP_G;
 86 
 87         /*
 88          * data and mgmt (except PS Poll):
 89          * - during CFP: 32768
 90          * - during contention period:
 91          *   if addr1 is group address: 0
 92          *   if more fragments = 0 and addr1 is individual address: time to
 93          *      transmit one ACK plus SIFS
 94          *   if more fragments = 1 and addr1 is individual address: time to
 95          *      transmit next fragment plus 2 x ACK plus 3 x SIFS
 96          *
 97          * IEEE 802.11, 9.6:
 98          * - control response frame (CTS or ACK) shall be transmitted using the
 99          *   same rate as the immediately previous frame in the frame exchange
100          *   sequence, if this rate belongs to the PHY mandatory rates, or else
101          *   at the highest possible rate belonging to the PHY rates in the
102          *   BSSBasicRateSet
103          */
104         hdr = (struct ieee80211_hdr *)skb->data;
105         if (ieee80211_is_ctl(hdr->frame_control)) {
106                 /* TODO: These control frames are not currently sent by
107                  * mac80211, but should they be implemented, this function
108                  * needs to be updated to support duration field calculation.
109                  *
110                  * RTS: time needed to transmit pending data/mgmt frame plus
111                  *    one CTS frame plus one ACK frame plus 3 x SIFS
112                  * CTS: duration of immediately previous RTS minus time
113                  *    required to transmit CTS and its SIFS
114                  * ACK: 0 if immediately previous directed data/mgmt had
115                  *    more=0, with more=1 duration in ACK frame is duration
116                  *    from previous frame minus time needed to transmit ACK
117                  *    and its SIFS
118                  * PS Poll: BIT(15) | BIT(14) | aid
119                  */
120                 return 0;
121         }
122 
123         /* data/mgmt */
124         if (0 /* FIX: data/mgmt during CFP */)
125                 return cpu_to_le16(32768);
126 
127         if (group_addr) /* Group address as the destination - no ACK */
128                 return 0;
129 
130         /* Individual destination address:
131          * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
132          * CTS and ACK frames shall be transmitted using the highest rate in
133          * basic rate set that is less than or equal to the rate of the
134          * immediately previous frame and that is using the same modulation
135          * (CCK or OFDM). If no basic rate set matches with these requirements,
136          * the highest mandatory rate of the PHY that is less than or equal to
137          * the rate of the previous frame is used.
138          * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
139          */
140         rate = -1;
141         /* use lowest available if everything fails */
142         mrate = sband->bitrates[0].bitrate;
143         for (i = 0; i < sband->n_bitrates; i++) {
144                 struct ieee80211_rate *r = &sband->bitrates[i];
145 
146                 if (r->bitrate > txrate->bitrate)
147                         break;
148 
149                 if ((rate_flags & r->flags) != rate_flags)
150                         continue;
151 
152                 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
153                         rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
154 
155                 switch (sband->band) {
156                 case NL80211_BAND_2GHZ: {
157                         u32 flag;
158                         if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
159                                 flag = IEEE80211_RATE_MANDATORY_G;
160                         else
161                                 flag = IEEE80211_RATE_MANDATORY_B;
162                         if (r->flags & flag)
163                                 mrate = r->bitrate;
164                         break;
165                 }
166                 case NL80211_BAND_5GHZ:
167                         if (r->flags & IEEE80211_RATE_MANDATORY_A)
168                                 mrate = r->bitrate;
169                         break;
170                 case NL80211_BAND_60GHZ:
171                         /* TODO, for now fall through */
172                 case NUM_NL80211_BANDS:
173                         WARN_ON(1);
174                         break;
175                 }
176         }
177         if (rate == -1) {
178                 /* No matching basic rate found; use highest suitable mandatory
179                  * PHY rate */
180                 rate = DIV_ROUND_UP(mrate, 1 << shift);
181         }
182 
183         /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
184         if (ieee80211_is_data_qos(hdr->frame_control) &&
185             *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
186                 dur = 0;
187         else
188                 /* Time needed to transmit ACK
189                  * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
190                  * to closest integer */
191                 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
192                                 tx->sdata->vif.bss_conf.use_short_preamble,
193                                 shift);
194 
195         if (next_frag_len) {
196                 /* Frame is fragmented: duration increases with time needed to
197                  * transmit next fragment plus ACK and 2 x SIFS. */
198                 dur *= 2; /* ACK + SIFS */
199                 /* next fragment */
200                 dur += ieee80211_frame_duration(sband->band, next_frag_len,
201                                 txrate->bitrate, erp,
202                                 tx->sdata->vif.bss_conf.use_short_preamble,
203                                 shift);
204         }
205 
206         return cpu_to_le16(dur);
207 }
208 
209 /* tx handlers */
210 static ieee80211_tx_result debug_noinline
211 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
212 {
213         struct ieee80211_local *local = tx->local;
214         struct ieee80211_if_managed *ifmgd;
215 
216         /* driver doesn't support power save */
217         if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
218                 return TX_CONTINUE;
219 
220         /* hardware does dynamic power save */
221         if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
222                 return TX_CONTINUE;
223 
224         /* dynamic power save disabled */
225         if (local->hw.conf.dynamic_ps_timeout <= 0)
226                 return TX_CONTINUE;
227 
228         /* we are scanning, don't enable power save */
229         if (local->scanning)
230                 return TX_CONTINUE;
231 
232         if (!local->ps_sdata)
233                 return TX_CONTINUE;
234 
235         /* No point if we're going to suspend */
236         if (local->quiescing)
237                 return TX_CONTINUE;
238 
239         /* dynamic ps is supported only in managed mode */
240         if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
241                 return TX_CONTINUE;
242 
243         ifmgd = &tx->sdata->u.mgd;
244 
245         /*
246          * Don't wakeup from power save if u-apsd is enabled, voip ac has
247          * u-apsd enabled and the frame is in voip class. This effectively
248          * means that even if all access categories have u-apsd enabled, in
249          * practise u-apsd is only used with the voip ac. This is a
250          * workaround for the case when received voip class packets do not
251          * have correct qos tag for some reason, due the network or the
252          * peer application.
253          *
254          * Note: ifmgd->uapsd_queues access is racy here. If the value is
255          * changed via debugfs, user needs to reassociate manually to have
256          * everything in sync.
257          */
258         if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
259             (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
260             skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
261                 return TX_CONTINUE;
262 
263         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
264                 ieee80211_stop_queues_by_reason(&local->hw,
265                                                 IEEE80211_MAX_QUEUE_MAP,
266                                                 IEEE80211_QUEUE_STOP_REASON_PS,
267                                                 false);
268                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
269                 ieee80211_queue_work(&local->hw,
270                                      &local->dynamic_ps_disable_work);
271         }
272 
273         /* Don't restart the timer if we're not disassociated */
274         if (!ifmgd->associated)
275                 return TX_CONTINUE;
276 
277         mod_timer(&local->dynamic_ps_timer, jiffies +
278                   msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
279 
280         return TX_CONTINUE;
281 }
282 
283 static ieee80211_tx_result debug_noinline
284 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
285 {
286 
287         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
288         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
289         bool assoc = false;
290 
291         if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
292                 return TX_CONTINUE;
293 
294         if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
295             test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
296             !ieee80211_is_probe_req(hdr->frame_control) &&
297             !ieee80211_is_nullfunc(hdr->frame_control))
298                 /*
299                  * When software scanning only nullfunc frames (to notify
300                  * the sleep state to the AP) and probe requests (for the
301                  * active scan) are allowed, all other frames should not be
302                  * sent and we should not get here, but if we do
303                  * nonetheless, drop them to avoid sending them
304                  * off-channel. See the link below and
305                  * ieee80211_start_scan() for more.
306                  *
307                  * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
308                  */
309                 return TX_DROP;
310 
311         if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
312                 return TX_CONTINUE;
313 
314         if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
315                 return TX_CONTINUE;
316 
317         if (tx->flags & IEEE80211_TX_PS_BUFFERED)
318                 return TX_CONTINUE;
319 
320         if (tx->sta)
321                 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
322 
323         if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
324                 if (unlikely(!assoc &&
325                              ieee80211_is_data(hdr->frame_control))) {
326 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
327                         sdata_info(tx->sdata,
328                                    "dropped data frame to not associated station %pM\n",
329                                    hdr->addr1);
330 #endif
331                         I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
332                         return TX_DROP;
333                 }
334         } else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
335                             ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
336                 /*
337                  * No associated STAs - no need to send multicast
338                  * frames.
339                  */
340                 return TX_DROP;
341         }
342 
343         return TX_CONTINUE;
344 }
345 
346 /* This function is called whenever the AP is about to exceed the maximum limit
347  * of buffered frames for power saving STAs. This situation should not really
348  * happen often during normal operation, so dropping the oldest buffered packet
349  * from each queue should be OK to make some room for new frames. */
350 static void purge_old_ps_buffers(struct ieee80211_local *local)
351 {
352         int total = 0, purged = 0;
353         struct sk_buff *skb;
354         struct ieee80211_sub_if_data *sdata;
355         struct sta_info *sta;
356 
357         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
358                 struct ps_data *ps;
359 
360                 if (sdata->vif.type == NL80211_IFTYPE_AP)
361                         ps = &sdata->u.ap.ps;
362                 else if (ieee80211_vif_is_mesh(&sdata->vif))
363                         ps = &sdata->u.mesh.ps;
364                 else
365                         continue;
366 
367                 skb = skb_dequeue(&ps->bc_buf);
368                 if (skb) {
369                         purged++;
370                         ieee80211_free_txskb(&local->hw, skb);
371                 }
372                 total += skb_queue_len(&ps->bc_buf);
373         }
374 
375         /*
376          * Drop one frame from each station from the lowest-priority
377          * AC that has frames at all.
378          */
379         list_for_each_entry_rcu(sta, &local->sta_list, list) {
380                 int ac;
381 
382                 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
383                         skb = skb_dequeue(&sta->ps_tx_buf[ac]);
384                         total += skb_queue_len(&sta->ps_tx_buf[ac]);
385                         if (skb) {
386                                 purged++;
387                                 ieee80211_free_txskb(&local->hw, skb);
388                                 break;
389                         }
390                 }
391         }
392 
393         local->total_ps_buffered = total;
394         ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
395 }
396 
397 static ieee80211_tx_result
398 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
399 {
400         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
401         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
402         struct ps_data *ps;
403 
404         /*
405          * broadcast/multicast frame
406          *
407          * If any of the associated/peer stations is in power save mode,
408          * the frame is buffered to be sent after DTIM beacon frame.
409          * This is done either by the hardware or us.
410          */
411 
412         /* powersaving STAs currently only in AP/VLAN/mesh mode */
413         if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
414             tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
415                 if (!tx->sdata->bss)
416                         return TX_CONTINUE;
417 
418                 ps = &tx->sdata->bss->ps;
419         } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
420                 ps = &tx->sdata->u.mesh.ps;
421         } else {
422                 return TX_CONTINUE;
423         }
424 
425 
426         /* no buffering for ordered frames */
427         if (ieee80211_has_order(hdr->frame_control))
428                 return TX_CONTINUE;
429 
430         if (ieee80211_is_probe_req(hdr->frame_control))
431                 return TX_CONTINUE;
432 
433         if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
434                 info->hw_queue = tx->sdata->vif.cab_queue;
435 
436         /* no stations in PS mode */
437         if (!atomic_read(&ps->num_sta_ps))
438                 return TX_CONTINUE;
439 
440         info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
441 
442         /* device releases frame after DTIM beacon */
443         if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
444                 return TX_CONTINUE;
445 
446         /* buffered in mac80211 */
447         if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
448                 purge_old_ps_buffers(tx->local);
449 
450         if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
451                 ps_dbg(tx->sdata,
452                        "BC TX buffer full - dropping the oldest frame\n");
453                 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
454         } else
455                 tx->local->total_ps_buffered++;
456 
457         skb_queue_tail(&ps->bc_buf, tx->skb);
458 
459         return TX_QUEUED;
460 }
461 
462 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
463                              struct sk_buff *skb)
464 {
465         if (!ieee80211_is_mgmt(fc))
466                 return 0;
467 
468         if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
469                 return 0;
470 
471         if (!ieee80211_is_robust_mgmt_frame(skb))
472                 return 0;
473 
474         return 1;
475 }
476 
477 static ieee80211_tx_result
478 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
479 {
480         struct sta_info *sta = tx->sta;
481         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
482         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
483         struct ieee80211_local *local = tx->local;
484 
485         if (unlikely(!sta))
486                 return TX_CONTINUE;
487 
488         if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
489                       test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
490                       test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
491                      !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
492                 int ac = skb_get_queue_mapping(tx->skb);
493 
494                 if (ieee80211_is_mgmt(hdr->frame_control) &&
495                     !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
496                         info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
497                         return TX_CONTINUE;
498                 }
499 
500                 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
501                        sta->sta.addr, sta->sta.aid, ac);
502                 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
503                         purge_old_ps_buffers(tx->local);
504 
505                 /* sync with ieee80211_sta_ps_deliver_wakeup */
506                 spin_lock(&sta->ps_lock);
507                 /*
508                  * STA woke up the meantime and all the frames on ps_tx_buf have
509                  * been queued to pending queue. No reordering can happen, go
510                  * ahead and Tx the packet.
511                  */
512                 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
513                     !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
514                     !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
515                         spin_unlock(&sta->ps_lock);
516                         return TX_CONTINUE;
517                 }
518 
519                 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
520                         struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
521                         ps_dbg(tx->sdata,
522                                "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
523                                sta->sta.addr, ac);
524                         ieee80211_free_txskb(&local->hw, old);
525                 } else
526                         tx->local->total_ps_buffered++;
527 
528                 info->control.jiffies = jiffies;
529                 info->control.vif = &tx->sdata->vif;
530                 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
531                 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
532                 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
533                 spin_unlock(&sta->ps_lock);
534 
535                 if (!timer_pending(&local->sta_cleanup))
536                         mod_timer(&local->sta_cleanup,
537                                   round_jiffies(jiffies +
538                                                 STA_INFO_CLEANUP_INTERVAL));
539 
540                 /*
541                  * We queued up some frames, so the TIM bit might
542                  * need to be set, recalculate it.
543                  */
544                 sta_info_recalc_tim(sta);
545 
546                 return TX_QUEUED;
547         } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
548                 ps_dbg(tx->sdata,
549                        "STA %pM in PS mode, but polling/in SP -> send frame\n",
550                        sta->sta.addr);
551         }
552 
553         return TX_CONTINUE;
554 }
555 
556 static ieee80211_tx_result debug_noinline
557 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
558 {
559         if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
560                 return TX_CONTINUE;
561 
562         if (tx->flags & IEEE80211_TX_UNICAST)
563                 return ieee80211_tx_h_unicast_ps_buf(tx);
564         else
565                 return ieee80211_tx_h_multicast_ps_buf(tx);
566 }
567 
568 static ieee80211_tx_result debug_noinline
569 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
570 {
571         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
572 
573         if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
574                 if (tx->sdata->control_port_no_encrypt)
575                         info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
576                 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
577                 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
578         }
579 
580         return TX_CONTINUE;
581 }
582 
583 static ieee80211_tx_result debug_noinline
584 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
585 {
586         struct ieee80211_key *key;
587         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
588         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
589 
590         if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
591                 tx->key = NULL;
592         else if (tx->sta &&
593                  (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
594                 tx->key = key;
595         else if (ieee80211_is_group_privacy_action(tx->skb) &&
596                 (key = rcu_dereference(tx->sdata->default_multicast_key)))
597                 tx->key = key;
598         else if (ieee80211_is_mgmt(hdr->frame_control) &&
599                  is_multicast_ether_addr(hdr->addr1) &&
600                  ieee80211_is_robust_mgmt_frame(tx->skb) &&
601                  (key = rcu_dereference(tx->sdata->default_mgmt_key)))
602                 tx->key = key;
603         else if (is_multicast_ether_addr(hdr->addr1) &&
604                  (key = rcu_dereference(tx->sdata->default_multicast_key)))
605                 tx->key = key;
606         else if (!is_multicast_ether_addr(hdr->addr1) &&
607                  (key = rcu_dereference(tx->sdata->default_unicast_key)))
608                 tx->key = key;
609         else
610                 tx->key = NULL;
611 
612         if (tx->key) {
613                 bool skip_hw = false;
614 
615                 /* TODO: add threshold stuff again */
616 
617                 switch (tx->key->conf.cipher) {
618                 case WLAN_CIPHER_SUITE_WEP40:
619                 case WLAN_CIPHER_SUITE_WEP104:
620                 case WLAN_CIPHER_SUITE_TKIP:
621                         if (!ieee80211_is_data_present(hdr->frame_control))
622                                 tx->key = NULL;
623                         break;
624                 case WLAN_CIPHER_SUITE_CCMP:
625                 case WLAN_CIPHER_SUITE_CCMP_256:
626                 case WLAN_CIPHER_SUITE_GCMP:
627                 case WLAN_CIPHER_SUITE_GCMP_256:
628                         if (!ieee80211_is_data_present(hdr->frame_control) &&
629                             !ieee80211_use_mfp(hdr->frame_control, tx->sta,
630                                                tx->skb) &&
631                             !ieee80211_is_group_privacy_action(tx->skb))
632                                 tx->key = NULL;
633                         else
634                                 skip_hw = (tx->key->conf.flags &
635                                            IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
636                                         ieee80211_is_mgmt(hdr->frame_control);
637                         break;
638                 case WLAN_CIPHER_SUITE_AES_CMAC:
639                 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
640                 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
641                 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
642                         if (!ieee80211_is_mgmt(hdr->frame_control))
643                                 tx->key = NULL;
644                         break;
645                 }
646 
647                 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
648                              !ieee80211_is_deauth(hdr->frame_control)))
649                         return TX_DROP;
650 
651                 if (!skip_hw && tx->key &&
652                     tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
653                         info->control.hw_key = &tx->key->conf;
654         }
655 
656         return TX_CONTINUE;
657 }
658 
659 static ieee80211_tx_result debug_noinline
660 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
661 {
662         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
663         struct ieee80211_hdr *hdr = (void *)tx->skb->data;
664         struct ieee80211_supported_band *sband;
665         u32 len;
666         struct ieee80211_tx_rate_control txrc;
667         struct ieee80211_sta_rates *ratetbl = NULL;
668         bool assoc = false;
669 
670         memset(&txrc, 0, sizeof(txrc));
671 
672         sband = tx->local->hw.wiphy->bands[info->band];
673 
674         len = min_t(u32, tx->skb->len + FCS_LEN,
675                          tx->local->hw.wiphy->frag_threshold);
676 
677         /* set up the tx rate control struct we give the RC algo */
678         txrc.hw = &tx->local->hw;
679         txrc.sband = sband;
680         txrc.bss_conf = &tx->sdata->vif.bss_conf;
681         txrc.skb = tx->skb;
682         txrc.reported_rate.idx = -1;
683         txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
684         if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
685                 txrc.max_rate_idx = -1;
686         else
687                 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
688 
689         if (tx->sdata->rc_has_mcs_mask[info->band])
690                 txrc.rate_idx_mcs_mask =
691                         tx->sdata->rc_rateidx_mcs_mask[info->band];
692 
693         txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
694                     tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
695                     tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
696                     tx->sdata->vif.type == NL80211_IFTYPE_OCB);
697 
698         /* set up RTS protection if desired */
699         if (len > tx->local->hw.wiphy->rts_threshold) {
700                 txrc.rts = true;
701         }
702 
703         info->control.use_rts = txrc.rts;
704         info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
705 
706         /*
707          * Use short preamble if the BSS can handle it, but not for
708          * management frames unless we know the receiver can handle
709          * that -- the management frame might be to a station that
710          * just wants a probe response.
711          */
712         if (tx->sdata->vif.bss_conf.use_short_preamble &&
713             (ieee80211_is_data(hdr->frame_control) ||
714              (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
715                 txrc.short_preamble = true;
716 
717         info->control.short_preamble = txrc.short_preamble;
718 
719         /* don't ask rate control when rate already injected via radiotap */
720         if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
721                 return TX_CONTINUE;
722 
723         if (tx->sta)
724                 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
725 
726         /*
727          * Lets not bother rate control if we're associated and cannot
728          * talk to the sta. This should not happen.
729          */
730         if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
731                  !rate_usable_index_exists(sband, &tx->sta->sta),
732                  "%s: Dropped data frame as no usable bitrate found while "
733                  "scanning and associated. Target station: "
734                  "%pM on %d GHz band\n",
735                  tx->sdata->name, hdr->addr1,
736                  info->band ? 5 : 2))
737                 return TX_DROP;
738 
739         /*
740          * If we're associated with the sta at this point we know we can at
741          * least send the frame at the lowest bit rate.
742          */
743         rate_control_get_rate(tx->sdata, tx->sta, &txrc);
744 
745         if (tx->sta && !info->control.skip_table)
746                 ratetbl = rcu_dereference(tx->sta->sta.rates);
747 
748         if (unlikely(info->control.rates[0].idx < 0)) {
749                 if (ratetbl) {
750                         struct ieee80211_tx_rate rate = {
751                                 .idx = ratetbl->rate[0].idx,
752                                 .flags = ratetbl->rate[0].flags,
753                                 .count = ratetbl->rate[0].count
754                         };
755 
756                         if (ratetbl->rate[0].idx < 0)
757                                 return TX_DROP;
758 
759                         tx->rate = rate;
760                 } else {
761                         return TX_DROP;
762                 }
763         } else {
764                 tx->rate = info->control.rates[0];
765         }
766 
767         if (txrc.reported_rate.idx < 0) {
768                 txrc.reported_rate = tx->rate;
769                 if (tx->sta && ieee80211_is_data(hdr->frame_control))
770                         tx->sta->tx_stats.last_rate = txrc.reported_rate;
771         } else if (tx->sta)
772                 tx->sta->tx_stats.last_rate = txrc.reported_rate;
773 
774         if (ratetbl)
775                 return TX_CONTINUE;
776 
777         if (unlikely(!info->control.rates[0].count))
778                 info->control.rates[0].count = 1;
779 
780         if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
781                          (info->flags & IEEE80211_TX_CTL_NO_ACK)))
782                 info->control.rates[0].count = 1;
783 
784         return TX_CONTINUE;
785 }
786 
787 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
788 {
789         u16 *seq = &sta->tid_seq[tid];
790         __le16 ret = cpu_to_le16(*seq);
791 
792         /* Increase the sequence number. */
793         *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
794 
795         return ret;
796 }
797 
798 static ieee80211_tx_result debug_noinline
799 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
800 {
801         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
802         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
803         u8 *qc;
804         int tid;
805 
806         /*
807          * Packet injection may want to control the sequence
808          * number, if we have no matching interface then we
809          * neither assign one ourselves nor ask the driver to.
810          */
811         if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
812                 return TX_CONTINUE;
813 
814         if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
815                 return TX_CONTINUE;
816 
817         if (ieee80211_hdrlen(hdr->frame_control) < 24)
818                 return TX_CONTINUE;
819 
820         if (ieee80211_is_qos_nullfunc(hdr->frame_control))
821                 return TX_CONTINUE;
822 
823         /*
824          * Anything but QoS data that has a sequence number field
825          * (is long enough) gets a sequence number from the global
826          * counter.  QoS data frames with a multicast destination
827          * also use the global counter (802.11-2012 9.3.2.10).
828          */
829         if (!ieee80211_is_data_qos(hdr->frame_control) ||
830             is_multicast_ether_addr(hdr->addr1)) {
831                 /* driver should assign sequence number */
832                 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
833                 /* for pure STA mode without beacons, we can do it */
834                 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
835                 tx->sdata->sequence_number += 0x10;
836                 if (tx->sta)
837                         tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
838                 return TX_CONTINUE;
839         }
840 
841         /*
842          * This should be true for injected/management frames only, for
843          * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
844          * above since they are not QoS-data frames.
845          */
846         if (!tx->sta)
847                 return TX_CONTINUE;
848 
849         /* include per-STA, per-TID sequence counter */
850 
851         qc = ieee80211_get_qos_ctl(hdr);
852         tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
853         tx->sta->tx_stats.msdu[tid]++;
854 
855         hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
856 
857         return TX_CONTINUE;
858 }
859 
860 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
861                               struct sk_buff *skb, int hdrlen,
862                               int frag_threshold)
863 {
864         struct ieee80211_local *local = tx->local;
865         struct ieee80211_tx_info *info;
866         struct sk_buff *tmp;
867         int per_fragm = frag_threshold - hdrlen - FCS_LEN;
868         int pos = hdrlen + per_fragm;
869         int rem = skb->len - hdrlen - per_fragm;
870 
871         if (WARN_ON(rem < 0))
872                 return -EINVAL;
873 
874         /* first fragment was already added to queue by caller */
875 
876         while (rem) {
877                 int fraglen = per_fragm;
878 
879                 if (fraglen > rem)
880                         fraglen = rem;
881                 rem -= fraglen;
882                 tmp = dev_alloc_skb(local->tx_headroom +
883                                     frag_threshold +
884                                     tx->sdata->encrypt_headroom +
885                                     IEEE80211_ENCRYPT_TAILROOM);
886                 if (!tmp)
887                         return -ENOMEM;
888 
889                 __skb_queue_tail(&tx->skbs, tmp);
890 
891                 skb_reserve(tmp,
892                             local->tx_headroom + tx->sdata->encrypt_headroom);
893 
894                 /* copy control information */
895                 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
896 
897                 info = IEEE80211_SKB_CB(tmp);
898                 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
899                                  IEEE80211_TX_CTL_FIRST_FRAGMENT);
900 
901                 if (rem)
902                         info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
903 
904                 skb_copy_queue_mapping(tmp, skb);
905                 tmp->priority = skb->priority;
906                 tmp->dev = skb->dev;
907 
908                 /* copy header and data */
909                 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
910                 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
911 
912                 pos += fraglen;
913         }
914 
915         /* adjust first fragment's length */
916         skb_trim(skb, hdrlen + per_fragm);
917         return 0;
918 }
919 
920 static ieee80211_tx_result debug_noinline
921 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
922 {
923         struct sk_buff *skb = tx->skb;
924         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
925         struct ieee80211_hdr *hdr = (void *)skb->data;
926         int frag_threshold = tx->local->hw.wiphy->frag_threshold;
927         int hdrlen;
928         int fragnum;
929 
930         /* no matter what happens, tx->skb moves to tx->skbs */
931         __skb_queue_tail(&tx->skbs, skb);
932         tx->skb = NULL;
933 
934         if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
935                 return TX_CONTINUE;
936 
937         if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
938                 return TX_CONTINUE;
939 
940         /*
941          * Warn when submitting a fragmented A-MPDU frame and drop it.
942          * This scenario is handled in ieee80211_tx_prepare but extra
943          * caution taken here as fragmented ampdu may cause Tx stop.
944          */
945         if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
946                 return TX_DROP;
947 
948         hdrlen = ieee80211_hdrlen(hdr->frame_control);
949 
950         /* internal error, why isn't DONTFRAG set? */
951         if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
952                 return TX_DROP;
953 
954         /*
955          * Now fragment the frame. This will allocate all the fragments and
956          * chain them (using skb as the first fragment) to skb->next.
957          * During transmission, we will remove the successfully transmitted
958          * fragments from this list. When the low-level driver rejects one
959          * of the fragments then we will simply pretend to accept the skb
960          * but store it away as pending.
961          */
962         if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
963                 return TX_DROP;
964 
965         /* update duration/seq/flags of fragments */
966         fragnum = 0;
967 
968         skb_queue_walk(&tx->skbs, skb) {
969                 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
970 
971                 hdr = (void *)skb->data;
972                 info = IEEE80211_SKB_CB(skb);
973 
974                 if (!skb_queue_is_last(&tx->skbs, skb)) {
975                         hdr->frame_control |= morefrags;
976                         /*
977                          * No multi-rate retries for fragmented frames, that
978                          * would completely throw off the NAV at other STAs.
979                          */
980                         info->control.rates[1].idx = -1;
981                         info->control.rates[2].idx = -1;
982                         info->control.rates[3].idx = -1;
983                         BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
984                         info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
985                 } else {
986                         hdr->frame_control &= ~morefrags;
987                 }
988                 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
989                 fragnum++;
990         }
991 
992         return TX_CONTINUE;
993 }
994 
995 static ieee80211_tx_result debug_noinline
996 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
997 {
998         struct sk_buff *skb;
999         int ac = -1;
1000 
1001         if (!tx->sta)
1002                 return TX_CONTINUE;
1003 
1004         skb_queue_walk(&tx->skbs, skb) {
1005                 ac = skb_get_queue_mapping(skb);
1006                 tx->sta->tx_stats.bytes[ac] += skb->len;
1007         }
1008         if (ac >= 0)
1009                 tx->sta->tx_stats.packets[ac]++;
1010 
1011         return TX_CONTINUE;
1012 }
1013 
1014 static ieee80211_tx_result debug_noinline
1015 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1016 {
1017         if (!tx->key)
1018                 return TX_CONTINUE;
1019 
1020         switch (tx->key->conf.cipher) {
1021         case WLAN_CIPHER_SUITE_WEP40:
1022         case WLAN_CIPHER_SUITE_WEP104:
1023                 return ieee80211_crypto_wep_encrypt(tx);
1024         case WLAN_CIPHER_SUITE_TKIP:
1025                 return ieee80211_crypto_tkip_encrypt(tx);
1026         case WLAN_CIPHER_SUITE_CCMP:
1027                 return ieee80211_crypto_ccmp_encrypt(
1028                         tx, IEEE80211_CCMP_MIC_LEN);
1029         case WLAN_CIPHER_SUITE_CCMP_256:
1030                 return ieee80211_crypto_ccmp_encrypt(
1031                         tx, IEEE80211_CCMP_256_MIC_LEN);
1032         case WLAN_CIPHER_SUITE_AES_CMAC:
1033                 return ieee80211_crypto_aes_cmac_encrypt(tx);
1034         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1035                 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1036         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1037         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1038                 return ieee80211_crypto_aes_gmac_encrypt(tx);
1039         case WLAN_CIPHER_SUITE_GCMP:
1040         case WLAN_CIPHER_SUITE_GCMP_256:
1041                 return ieee80211_crypto_gcmp_encrypt(tx);
1042         default:
1043                 return ieee80211_crypto_hw_encrypt(tx);
1044         }
1045 
1046         return TX_DROP;
1047 }
1048 
1049 static ieee80211_tx_result debug_noinline
1050 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1051 {
1052         struct sk_buff *skb;
1053         struct ieee80211_hdr *hdr;
1054         int next_len;
1055         bool group_addr;
1056 
1057         skb_queue_walk(&tx->skbs, skb) {
1058                 hdr = (void *) skb->data;
1059                 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1060                         break; /* must not overwrite AID */
1061                 if (!skb_queue_is_last(&tx->skbs, skb)) {
1062                         struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1063                         next_len = next->len;
1064                 } else
1065                         next_len = 0;
1066                 group_addr = is_multicast_ether_addr(hdr->addr1);
1067 
1068                 hdr->duration_id =
1069                         ieee80211_duration(tx, skb, group_addr, next_len);
1070         }
1071 
1072         return TX_CONTINUE;
1073 }
1074 
1075 /* actual transmit path */
1076 
1077 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1078                                   struct sk_buff *skb,
1079                                   struct ieee80211_tx_info *info,
1080                                   struct tid_ampdu_tx *tid_tx,
1081                                   int tid)
1082 {
1083         bool queued = false;
1084         bool reset_agg_timer = false;
1085         struct sk_buff *purge_skb = NULL;
1086 
1087         if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1088                 info->flags |= IEEE80211_TX_CTL_AMPDU;
1089                 reset_agg_timer = true;
1090         } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1091                 /*
1092                  * nothing -- this aggregation session is being started
1093                  * but that might still fail with the driver
1094                  */
1095         } else if (!tx->sta->sta.txq[tid]) {
1096                 spin_lock(&tx->sta->lock);
1097                 /*
1098                  * Need to re-check now, because we may get here
1099                  *
1100                  *  1) in the window during which the setup is actually
1101                  *     already done, but not marked yet because not all
1102                  *     packets are spliced over to the driver pending
1103                  *     queue yet -- if this happened we acquire the lock
1104                  *     either before or after the splice happens, but
1105                  *     need to recheck which of these cases happened.
1106                  *
1107                  *  2) during session teardown, if the OPERATIONAL bit
1108                  *     was cleared due to the teardown but the pointer
1109                  *     hasn't been assigned NULL yet (or we loaded it
1110                  *     before it was assigned) -- in this case it may
1111                  *     now be NULL which means we should just let the
1112                  *     packet pass through because splicing the frames
1113                  *     back is already done.
1114                  */
1115                 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1116 
1117                 if (!tid_tx) {
1118                         /* do nothing, let packet pass through */
1119                 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1120                         info->flags |= IEEE80211_TX_CTL_AMPDU;
1121                         reset_agg_timer = true;
1122                 } else {
1123                         queued = true;
1124                         if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1125                                 clear_sta_flag(tx->sta, WLAN_STA_SP);
1126                                 ps_dbg(tx->sta->sdata,
1127                                        "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1128                                        tx->sta->sta.addr, tx->sta->sta.aid);
1129                         }
1130                         info->control.vif = &tx->sdata->vif;
1131                         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1132                         info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1133                         __skb_queue_tail(&tid_tx->pending, skb);
1134                         if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1135                                 purge_skb = __skb_dequeue(&tid_tx->pending);
1136                 }
1137                 spin_unlock(&tx->sta->lock);
1138 
1139                 if (purge_skb)
1140                         ieee80211_free_txskb(&tx->local->hw, purge_skb);
1141         }
1142 
1143         /* reset session timer */
1144         if (reset_agg_timer && tid_tx->timeout)
1145                 tid_tx->last_tx = jiffies;
1146 
1147         return queued;
1148 }
1149 
1150 /*
1151  * initialises @tx
1152  * pass %NULL for the station if unknown, a valid pointer if known
1153  * or an ERR_PTR() if the station is known not to exist
1154  */
1155 static ieee80211_tx_result
1156 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1157                      struct ieee80211_tx_data *tx,
1158                      struct sta_info *sta, struct sk_buff *skb)
1159 {
1160         struct ieee80211_local *local = sdata->local;
1161         struct ieee80211_hdr *hdr;
1162         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1163         int tid;
1164         u8 *qc;
1165 
1166         memset(tx, 0, sizeof(*tx));
1167         tx->skb = skb;
1168         tx->local = local;
1169         tx->sdata = sdata;
1170         __skb_queue_head_init(&tx->skbs);
1171 
1172         /*
1173          * If this flag is set to true anywhere, and we get here,
1174          * we are doing the needed processing, so remove the flag
1175          * now.
1176          */
1177         info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1178 
1179         hdr = (struct ieee80211_hdr *) skb->data;
1180 
1181         if (likely(sta)) {
1182                 if (!IS_ERR(sta))
1183                         tx->sta = sta;
1184         } else {
1185                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1186                         tx->sta = rcu_dereference(sdata->u.vlan.sta);
1187                         if (!tx->sta && sdata->wdev.use_4addr)
1188                                 return TX_DROP;
1189                 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1190                                           IEEE80211_TX_CTL_INJECTED) ||
1191                            tx->sdata->control_port_protocol == tx->skb->protocol) {
1192                         tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1193                 }
1194                 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1195                         tx->sta = sta_info_get(sdata, hdr->addr1);
1196         }
1197 
1198         if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1199             !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1200             ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1201             !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1202                 struct tid_ampdu_tx *tid_tx;
1203 
1204                 qc = ieee80211_get_qos_ctl(hdr);
1205                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1206 
1207                 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1208                 if (tid_tx) {
1209                         bool queued;
1210 
1211                         queued = ieee80211_tx_prep_agg(tx, skb, info,
1212                                                        tid_tx, tid);
1213 
1214                         if (unlikely(queued))
1215                                 return TX_QUEUED;
1216                 }
1217         }
1218 
1219         if (is_multicast_ether_addr(hdr->addr1)) {
1220                 tx->flags &= ~IEEE80211_TX_UNICAST;
1221                 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1222         } else
1223                 tx->flags |= IEEE80211_TX_UNICAST;
1224 
1225         if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1226                 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1227                     skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1228                     info->flags & IEEE80211_TX_CTL_AMPDU)
1229                         info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1230         }
1231 
1232         if (!tx->sta)
1233                 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1234         else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1235                 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1236                 ieee80211_check_fast_xmit(tx->sta);
1237         }
1238 
1239         info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1240 
1241         return TX_CONTINUE;
1242 }
1243 
1244 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1245                                           struct ieee80211_vif *vif,
1246                                           struct sta_info *sta,
1247                                           struct sk_buff *skb)
1248 {
1249         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1250         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1251         struct ieee80211_txq *txq = NULL;
1252 
1253         if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1254             (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1255                 return NULL;
1256 
1257         if (!ieee80211_is_data(hdr->frame_control))
1258                 return NULL;
1259 
1260         if (sta) {
1261                 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1262 
1263                 if (!sta->uploaded)
1264                         return NULL;
1265 
1266                 txq = sta->sta.txq[tid];
1267         } else if (vif) {
1268                 txq = vif->txq;
1269         }
1270 
1271         if (!txq)
1272                 return NULL;
1273 
1274         return to_txq_info(txq);
1275 }
1276 
1277 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1278 {
1279         IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1280 }
1281 
1282 static void ieee80211_set_skb_vif(struct sk_buff *skb, struct txq_info *txqi)
1283 {
1284         IEEE80211_SKB_CB(skb)->control.vif = txqi->txq.vif;
1285 }
1286 
1287 static u32 codel_skb_len_func(const struct sk_buff *skb)
1288 {
1289         return skb->len;
1290 }
1291 
1292 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1293 {
1294         const struct ieee80211_tx_info *info;
1295 
1296         info = (const struct ieee80211_tx_info *)skb->cb;
1297         return info->control.enqueue_time;
1298 }
1299 
1300 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1301                                           void *ctx)
1302 {
1303         struct ieee80211_local *local;
1304         struct txq_info *txqi;
1305         struct fq *fq;
1306         struct fq_flow *flow;
1307 
1308         txqi = ctx;
1309         local = vif_to_sdata(txqi->txq.vif)->local;
1310         fq = &local->fq;
1311 
1312         if (cvars == &txqi->def_cvars)
1313                 flow = &txqi->def_flow;
1314         else
1315                 flow = &fq->flows[cvars - local->cvars];
1316 
1317         return fq_flow_dequeue(fq, flow);
1318 }
1319 
1320 static void codel_drop_func(struct sk_buff *skb,
1321                             void *ctx)
1322 {
1323         struct ieee80211_local *local;
1324         struct ieee80211_hw *hw;
1325         struct txq_info *txqi;
1326 
1327         txqi = ctx;
1328         local = vif_to_sdata(txqi->txq.vif)->local;
1329         hw = &local->hw;
1330 
1331         ieee80211_free_txskb(hw, skb);
1332 }
1333 
1334 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1335                                            struct fq_tin *tin,
1336                                            struct fq_flow *flow)
1337 {
1338         struct ieee80211_local *local;
1339         struct txq_info *txqi;
1340         struct codel_vars *cvars;
1341         struct codel_params *cparams;
1342         struct codel_stats *cstats;
1343 
1344         local = container_of(fq, struct ieee80211_local, fq);
1345         txqi = container_of(tin, struct txq_info, tin);
1346         cparams = &local->cparams;
1347         cstats = &txqi->cstats;
1348 
1349         if (flow == &txqi->def_flow)
1350                 cvars = &txqi->def_cvars;
1351         else
1352                 cvars = &local->cvars[flow - fq->flows];
1353 
1354         return codel_dequeue(txqi,
1355                              &flow->backlog,
1356                              cparams,
1357                              cvars,
1358                              cstats,
1359                              codel_skb_len_func,
1360                              codel_skb_time_func,
1361                              codel_drop_func,
1362                              codel_dequeue_func);
1363 }
1364 
1365 static void fq_skb_free_func(struct fq *fq,
1366                              struct fq_tin *tin,
1367                              struct fq_flow *flow,
1368                              struct sk_buff *skb)
1369 {
1370         struct ieee80211_local *local;
1371 
1372         local = container_of(fq, struct ieee80211_local, fq);
1373         ieee80211_free_txskb(&local->hw, skb);
1374 }
1375 
1376 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1377                                                 struct fq_tin *tin,
1378                                                 int idx,
1379                                                 struct sk_buff *skb)
1380 {
1381         struct txq_info *txqi;
1382 
1383         txqi = container_of(tin, struct txq_info, tin);
1384         return &txqi->def_flow;
1385 }
1386 
1387 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1388                                   struct txq_info *txqi,
1389                                   struct sk_buff *skb)
1390 {
1391         struct fq *fq = &local->fq;
1392         struct fq_tin *tin = &txqi->tin;
1393 
1394         ieee80211_set_skb_enqueue_time(skb);
1395         fq_tin_enqueue(fq, tin, skb,
1396                        fq_skb_free_func,
1397                        fq_flow_get_default_func);
1398 }
1399 
1400 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1401                         struct sta_info *sta,
1402                         struct txq_info *txqi, int tid)
1403 {
1404         fq_tin_init(&txqi->tin);
1405         fq_flow_init(&txqi->def_flow);
1406         codel_vars_init(&txqi->def_cvars);
1407         codel_stats_init(&txqi->cstats);
1408         __skb_queue_head_init(&txqi->frags);
1409 
1410         txqi->txq.vif = &sdata->vif;
1411 
1412         if (sta) {
1413                 txqi->txq.sta = &sta->sta;
1414                 sta->sta.txq[tid] = &txqi->txq;
1415                 txqi->txq.tid = tid;
1416                 txqi->txq.ac = ieee802_1d_to_ac[tid & 7];
1417         } else {
1418                 sdata->vif.txq = &txqi->txq;
1419                 txqi->txq.tid = 0;
1420                 txqi->txq.ac = IEEE80211_AC_BE;
1421         }
1422 }
1423 
1424 void ieee80211_txq_purge(struct ieee80211_local *local,
1425                          struct txq_info *txqi)
1426 {
1427         struct fq *fq = &local->fq;
1428         struct fq_tin *tin = &txqi->tin;
1429 
1430         fq_tin_reset(fq, tin, fq_skb_free_func);
1431         ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1432 }
1433 
1434 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1435 {
1436         struct fq *fq = &local->fq;
1437         int ret;
1438         int i;
1439         bool supp_vht = false;
1440         enum nl80211_band band;
1441 
1442         if (!local->ops->wake_tx_queue)
1443                 return 0;
1444 
1445         ret = fq_init(fq, 4096);
1446         if (ret)
1447                 return ret;
1448 
1449         /*
1450          * If the hardware doesn't support VHT, it is safe to limit the maximum
1451          * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1452          */
1453         for (band = 0; band < NUM_NL80211_BANDS; band++) {
1454                 struct ieee80211_supported_band *sband;
1455 
1456                 sband = local->hw.wiphy->bands[band];
1457                 if (!sband)
1458                         continue;
1459 
1460                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1461         }
1462 
1463         if (!supp_vht)
1464                 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1465 
1466         codel_params_init(&local->cparams);
1467         local->cparams.interval = MS2TIME(100);
1468         local->cparams.target = MS2TIME(20);
1469         local->cparams.ecn = true;
1470 
1471         local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1472                                GFP_KERNEL);
1473         if (!local->cvars) {
1474                 spin_lock_bh(&fq->lock);
1475                 fq_reset(fq, fq_skb_free_func);
1476                 spin_unlock_bh(&fq->lock);
1477                 return -ENOMEM;
1478         }
1479 
1480         for (i = 0; i < fq->flows_cnt; i++)
1481                 codel_vars_init(&local->cvars[i]);
1482 
1483         return 0;
1484 }
1485 
1486 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1487 {
1488         struct fq *fq = &local->fq;
1489 
1490         if (!local->ops->wake_tx_queue)
1491                 return;
1492 
1493         kfree(local->cvars);
1494         local->cvars = NULL;
1495 
1496         spin_lock_bh(&fq->lock);
1497         fq_reset(fq, fq_skb_free_func);
1498         spin_unlock_bh(&fq->lock);
1499 }
1500 
1501 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1502                                 struct ieee80211_sub_if_data *sdata,
1503                                 struct sta_info *sta,
1504                                 struct sk_buff *skb)
1505 {
1506         struct fq *fq = &local->fq;
1507         struct ieee80211_vif *vif;
1508         struct txq_info *txqi;
1509 
1510         if (!local->ops->wake_tx_queue ||
1511             sdata->vif.type == NL80211_IFTYPE_MONITOR)
1512                 return false;
1513 
1514         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1515                 sdata = container_of(sdata->bss,
1516                                      struct ieee80211_sub_if_data, u.ap);
1517 
1518         vif = &sdata->vif;
1519         txqi = ieee80211_get_txq(local, vif, sta, skb);
1520 
1521         if (!txqi)
1522                 return false;
1523 
1524         spin_lock_bh(&fq->lock);
1525         ieee80211_txq_enqueue(local, txqi, skb);
1526         spin_unlock_bh(&fq->lock);
1527 
1528         drv_wake_tx_queue(local, txqi);
1529 
1530         return true;
1531 }
1532 
1533 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1534                                struct ieee80211_vif *vif,
1535                                struct ieee80211_sta *sta,
1536                                struct sk_buff_head *skbs,
1537                                bool txpending)
1538 {
1539         struct ieee80211_tx_control control = {};
1540         struct sk_buff *skb, *tmp;
1541         unsigned long flags;
1542 
1543         skb_queue_walk_safe(skbs, skb, tmp) {
1544                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1545                 int q = info->hw_queue;
1546 
1547 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1548                 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1549                         __skb_unlink(skb, skbs);
1550                         ieee80211_free_txskb(&local->hw, skb);
1551                         continue;
1552                 }
1553 #endif
1554 
1555                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1556                 if (local->queue_stop_reasons[q] ||
1557                     (!txpending && !skb_queue_empty(&local->pending[q]))) {
1558                         if (unlikely(info->flags &
1559                                      IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1560                                 if (local->queue_stop_reasons[q] &
1561                                     ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1562                                         /*
1563                                          * Drop off-channel frames if queues
1564                                          * are stopped for any reason other
1565                                          * than off-channel operation. Never
1566                                          * queue them.
1567                                          */
1568                                         spin_unlock_irqrestore(
1569                                                 &local->queue_stop_reason_lock,
1570                                                 flags);
1571                                         ieee80211_purge_tx_queue(&local->hw,
1572                                                                  skbs);
1573                                         return true;
1574                                 }
1575                         } else {
1576 
1577                                 /*
1578                                  * Since queue is stopped, queue up frames for
1579                                  * later transmission from the tx-pending
1580                                  * tasklet when the queue is woken again.
1581                                  */
1582                                 if (txpending)
1583                                         skb_queue_splice_init(skbs,
1584                                                               &local->pending[q]);
1585                                 else
1586                                         skb_queue_splice_tail_init(skbs,
1587                                                                    &local->pending[q]);
1588 
1589                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1590                                                        flags);
1591                                 return false;
1592                         }
1593                 }
1594                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1595 
1596                 info->control.vif = vif;
1597                 control.sta = sta;
1598 
1599                 __skb_unlink(skb, skbs);
1600                 drv_tx(local, &control, skb);
1601         }
1602 
1603         return true;
1604 }
1605 
1606 /*
1607  * Returns false if the frame couldn't be transmitted but was queued instead.
1608  */
1609 static bool __ieee80211_tx(struct ieee80211_local *local,
1610                            struct sk_buff_head *skbs, int led_len,
1611                            struct sta_info *sta, bool txpending)
1612 {
1613         struct ieee80211_tx_info *info;
1614         struct ieee80211_sub_if_data *sdata;
1615         struct ieee80211_vif *vif;
1616         struct ieee80211_sta *pubsta;
1617         struct sk_buff *skb;
1618         bool result = true;
1619         __le16 fc;
1620 
1621         if (WARN_ON(skb_queue_empty(skbs)))
1622                 return true;
1623 
1624         skb = skb_peek(skbs);
1625         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1626         info = IEEE80211_SKB_CB(skb);
1627         sdata = vif_to_sdata(info->control.vif);
1628         if (sta && !sta->uploaded)
1629                 sta = NULL;
1630 
1631         if (sta)
1632                 pubsta = &sta->sta;
1633         else
1634                 pubsta = NULL;
1635 
1636         switch (sdata->vif.type) {
1637         case NL80211_IFTYPE_MONITOR:
1638                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1639                         vif = &sdata->vif;
1640                         break;
1641                 }
1642                 sdata = rcu_dereference(local->monitor_sdata);
1643                 if (sdata) {
1644                         vif = &sdata->vif;
1645                         info->hw_queue =
1646                                 vif->hw_queue[skb_get_queue_mapping(skb)];
1647                 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1648                         ieee80211_purge_tx_queue(&local->hw, skbs);
1649                         return true;
1650                 } else
1651                         vif = NULL;
1652                 break;
1653         case NL80211_IFTYPE_AP_VLAN:
1654                 sdata = container_of(sdata->bss,
1655                                      struct ieee80211_sub_if_data, u.ap);
1656                 /* fall through */
1657         default:
1658                 vif = &sdata->vif;
1659                 break;
1660         }
1661 
1662         result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1663                                     txpending);
1664 
1665         ieee80211_tpt_led_trig_tx(local, fc, led_len);
1666 
1667         WARN_ON_ONCE(!skb_queue_empty(skbs));
1668 
1669         return result;
1670 }
1671 
1672 /*
1673  * Invoke TX handlers, return 0 on success and non-zero if the
1674  * frame was dropped or queued.
1675  *
1676  * The handlers are split into an early and late part. The latter is everything
1677  * that can be sensitive to reordering, and will be deferred to after packets
1678  * are dequeued from the intermediate queues (when they are enabled).
1679  */
1680 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1681 {
1682         ieee80211_tx_result res = TX_DROP;
1683 
1684 #define CALL_TXH(txh) \
1685         do {                            \
1686                 res = txh(tx);          \
1687                 if (res != TX_CONTINUE) \
1688                         goto txh_done;  \
1689         } while (0)
1690 
1691         CALL_TXH(ieee80211_tx_h_dynamic_ps);
1692         CALL_TXH(ieee80211_tx_h_check_assoc);
1693         CALL_TXH(ieee80211_tx_h_ps_buf);
1694         CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1695         CALL_TXH(ieee80211_tx_h_select_key);
1696         if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1697                 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1698 
1699  txh_done:
1700         if (unlikely(res == TX_DROP)) {
1701                 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1702                 if (tx->skb)
1703                         ieee80211_free_txskb(&tx->local->hw, tx->skb);
1704                 else
1705                         ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1706                 return -1;
1707         } else if (unlikely(res == TX_QUEUED)) {
1708                 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1709                 return -1;
1710         }
1711 
1712         return 0;
1713 }
1714 
1715 /*
1716  * Late handlers can be called while the sta lock is held. Handlers that can
1717  * cause packets to be generated will cause deadlock!
1718  */
1719 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1720 {
1721         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1722         ieee80211_tx_result res = TX_CONTINUE;
1723 
1724         if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1725                 __skb_queue_tail(&tx->skbs, tx->skb);
1726                 tx->skb = NULL;
1727                 goto txh_done;
1728         }
1729 
1730         CALL_TXH(ieee80211_tx_h_michael_mic_add);
1731         CALL_TXH(ieee80211_tx_h_sequence);
1732         CALL_TXH(ieee80211_tx_h_fragment);
1733         /* handlers after fragment must be aware of tx info fragmentation! */
1734         CALL_TXH(ieee80211_tx_h_stats);
1735         CALL_TXH(ieee80211_tx_h_encrypt);
1736         if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1737                 CALL_TXH(ieee80211_tx_h_calculate_duration);
1738 #undef CALL_TXH
1739 
1740  txh_done:
1741         if (unlikely(res == TX_DROP)) {
1742                 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1743                 if (tx->skb)
1744                         ieee80211_free_txskb(&tx->local->hw, tx->skb);
1745                 else
1746                         ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1747                 return -1;
1748         } else if (unlikely(res == TX_QUEUED)) {
1749                 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1750                 return -1;
1751         }
1752 
1753         return 0;
1754 }
1755 
1756 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1757 {
1758         int r = invoke_tx_handlers_early(tx);
1759 
1760         if (r)
1761                 return r;
1762         return invoke_tx_handlers_late(tx);
1763 }
1764 
1765 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1766                               struct ieee80211_vif *vif, struct sk_buff *skb,
1767                               int band, struct ieee80211_sta **sta)
1768 {
1769         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1770         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1771         struct ieee80211_tx_data tx;
1772         struct sk_buff *skb2;
1773 
1774         if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1775                 return false;
1776 
1777         info->band = band;
1778         info->control.vif = vif;
1779         info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1780 
1781         if (invoke_tx_handlers(&tx))
1782                 return false;
1783 
1784         if (sta) {
1785                 if (tx.sta)
1786                         *sta = &tx.sta->sta;
1787                 else
1788                         *sta = NULL;
1789         }
1790 
1791         /* this function isn't suitable for fragmented data frames */
1792         skb2 = __skb_dequeue(&tx.skbs);
1793         if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1794                 ieee80211_free_txskb(hw, skb2);
1795                 ieee80211_purge_tx_queue(hw, &tx.skbs);
1796                 return false;
1797         }
1798 
1799         return true;
1800 }
1801 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1802 
1803 /*
1804  * Returns false if the frame couldn't be transmitted but was queued instead.
1805  */
1806 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1807                          struct sta_info *sta, struct sk_buff *skb,
1808                          bool txpending)
1809 {
1810         struct ieee80211_local *local = sdata->local;
1811         struct ieee80211_tx_data tx;
1812         ieee80211_tx_result res_prepare;
1813         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1814         bool result = true;
1815         int led_len;
1816 
1817         if (unlikely(skb->len < 10)) {
1818                 dev_kfree_skb(skb);
1819                 return true;
1820         }
1821 
1822         /* initialises tx */
1823         led_len = skb->len;
1824         res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1825 
1826         if (unlikely(res_prepare == TX_DROP)) {
1827                 ieee80211_free_txskb(&local->hw, skb);
1828                 return true;
1829         } else if (unlikely(res_prepare == TX_QUEUED)) {
1830                 return true;
1831         }
1832 
1833         /* set up hw_queue value early */
1834         if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1835             !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1836                 info->hw_queue =
1837                         sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1838 
1839         if (invoke_tx_handlers_early(&tx))
1840                 return false;
1841 
1842         if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1843                 return true;
1844 
1845         if (!invoke_tx_handlers_late(&tx))
1846                 result = __ieee80211_tx(local, &tx.skbs, led_len,
1847                                         tx.sta, txpending);
1848 
1849         return result;
1850 }
1851 
1852 /* device xmit handlers */
1853 
1854 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1855                                 struct sk_buff *skb,
1856                                 int head_need, bool may_encrypt)
1857 {
1858         struct ieee80211_local *local = sdata->local;
1859         int tail_need = 0;
1860 
1861         if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1862                 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1863                 tail_need -= skb_tailroom(skb);
1864                 tail_need = max_t(int, tail_need, 0);
1865         }
1866 
1867         if (skb_cloned(skb) &&
1868             (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1869              !skb_clone_writable(skb, ETH_HLEN) ||
1870              (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1871                 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1872         else if (head_need || tail_need)
1873                 I802_DEBUG_INC(local->tx_expand_skb_head);
1874         else
1875                 return 0;
1876 
1877         if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1878                 wiphy_debug(local->hw.wiphy,
1879                             "failed to reallocate TX buffer\n");
1880                 return -ENOMEM;
1881         }
1882 
1883         return 0;
1884 }
1885 
1886 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1887                     struct sta_info *sta, struct sk_buff *skb)
1888 {
1889         struct ieee80211_local *local = sdata->local;
1890         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1891         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1892         int headroom;
1893         bool may_encrypt;
1894 
1895         may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1896 
1897         headroom = local->tx_headroom;
1898         if (may_encrypt)
1899                 headroom += sdata->encrypt_headroom;
1900         headroom -= skb_headroom(skb);
1901         headroom = max_t(int, 0, headroom);
1902 
1903         if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1904                 ieee80211_free_txskb(&local->hw, skb);
1905                 return;
1906         }
1907 
1908         hdr = (struct ieee80211_hdr *) skb->data;
1909         info->control.vif = &sdata->vif;
1910 
1911         if (ieee80211_vif_is_mesh(&sdata->vif)) {
1912                 if (ieee80211_is_data(hdr->frame_control) &&
1913                     is_unicast_ether_addr(hdr->addr1)) {
1914                         if (mesh_nexthop_resolve(sdata, skb))
1915                                 return; /* skb queued: don't free */
1916                 } else {
1917                         ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1918                 }
1919         }
1920 
1921         ieee80211_set_qos_hdr(sdata, skb);
1922         ieee80211_tx(sdata, sta, skb, false);
1923 }
1924 
1925 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1926                                         struct sk_buff *skb)
1927 {
1928         struct ieee80211_radiotap_iterator iterator;
1929         struct ieee80211_radiotap_header *rthdr =
1930                 (struct ieee80211_radiotap_header *) skb->data;
1931         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1932         struct ieee80211_supported_band *sband =
1933                 local->hw.wiphy->bands[info->band];
1934         int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1935                                                    NULL);
1936         u16 txflags;
1937         u16 rate = 0;
1938         bool rate_found = false;
1939         u8 rate_retries = 0;
1940         u16 rate_flags = 0;
1941         u8 mcs_known, mcs_flags, mcs_bw;
1942         u16 vht_known;
1943         u8 vht_mcs = 0, vht_nss = 0;
1944         int i;
1945 
1946         info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1947                        IEEE80211_TX_CTL_DONTFRAG;
1948 
1949         /*
1950          * for every radiotap entry that is present
1951          * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1952          * entries present, or -EINVAL on error)
1953          */
1954 
1955         while (!ret) {
1956                 ret = ieee80211_radiotap_iterator_next(&iterator);
1957 
1958                 if (ret)
1959                         continue;
1960 
1961                 /* see if this argument is something we can use */
1962                 switch (iterator.this_arg_index) {
1963                 /*
1964                  * You must take care when dereferencing iterator.this_arg
1965                  * for multibyte types... the pointer is not aligned.  Use
1966                  * get_unaligned((type *)iterator.this_arg) to dereference
1967                  * iterator.this_arg for type "type" safely on all arches.
1968                 */
1969                 case IEEE80211_RADIOTAP_FLAGS:
1970                         if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1971                                 /*
1972                                  * this indicates that the skb we have been
1973                                  * handed has the 32-bit FCS CRC at the end...
1974                                  * we should react to that by snipping it off
1975                                  * because it will be recomputed and added
1976                                  * on transmission
1977                                  */
1978                                 if (skb->len < (iterator._max_length + FCS_LEN))
1979                                         return false;
1980 
1981                                 skb_trim(skb, skb->len - FCS_LEN);
1982                         }
1983                         if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1984                                 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1985                         if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1986                                 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1987                         break;
1988 
1989                 case IEEE80211_RADIOTAP_TX_FLAGS:
1990                         txflags = get_unaligned_le16(iterator.this_arg);
1991                         if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1992                                 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1993                         break;
1994 
1995                 case IEEE80211_RADIOTAP_RATE:
1996                         rate = *iterator.this_arg;
1997                         rate_flags = 0;
1998                         rate_found = true;
1999                         break;
2000 
2001                 case IEEE80211_RADIOTAP_DATA_RETRIES:
2002                         rate_retries = *iterator.this_arg;
2003                         break;
2004 
2005                 case IEEE80211_RADIOTAP_MCS:
2006                         mcs_known = iterator.this_arg[0];
2007                         mcs_flags = iterator.this_arg[1];
2008                         if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2009                                 break;
2010 
2011                         rate_found = true;
2012                         rate = iterator.this_arg[2];
2013                         rate_flags = IEEE80211_TX_RC_MCS;
2014 
2015                         if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2016                             mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2017                                 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2018 
2019                         mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2020                         if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2021                             mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2022                                 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2023                         break;
2024 
2025                 case IEEE80211_RADIOTAP_VHT:
2026                         vht_known = get_unaligned_le16(iterator.this_arg);
2027                         rate_found = true;
2028 
2029                         rate_flags = IEEE80211_TX_RC_VHT_MCS;
2030                         if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2031                             (iterator.this_arg[2] &
2032                              IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2033                                 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2034                         if (vht_known &
2035                             IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2036                                 if (iterator.this_arg[3] == 1)
2037                                         rate_flags |=
2038                                                 IEEE80211_TX_RC_40_MHZ_WIDTH;
2039                                 else if (iterator.this_arg[3] == 4)
2040                                         rate_flags |=
2041                                                 IEEE80211_TX_RC_80_MHZ_WIDTH;
2042                                 else if (iterator.this_arg[3] == 11)
2043                                         rate_flags |=
2044                                                 IEEE80211_TX_RC_160_MHZ_WIDTH;
2045                         }
2046 
2047                         vht_mcs = iterator.this_arg[4] >> 4;
2048                         vht_nss = iterator.this_arg[4] & 0xF;
2049                         break;
2050 
2051                 /*
2052                  * Please update the file
2053                  * Documentation/networking/mac80211-injection.txt
2054                  * when parsing new fields here.
2055                  */
2056 
2057                 default:
2058                         break;
2059                 }
2060         }
2061 
2062         if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2063                 return false;
2064 
2065         if (rate_found) {
2066                 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2067 
2068                 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2069                         info->control.rates[i].idx = -1;
2070                         info->control.rates[i].flags = 0;
2071                         info->control.rates[i].count = 0;
2072                 }
2073 
2074                 if (rate_flags & IEEE80211_TX_RC_MCS) {
2075                         info->control.rates[0].idx = rate;
2076                 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2077                         ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2078                                                vht_nss);
2079                 } else {
2080                         for (i = 0; i < sband->n_bitrates; i++) {
2081                                 if (rate * 5 != sband->bitrates[i].bitrate)
2082                                         continue;
2083 
2084                                 info->control.rates[0].idx = i;
2085                                 break;
2086                         }
2087                 }
2088 
2089                 if (info->control.rates[0].idx < 0)
2090                         info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2091 
2092                 info->control.rates[0].flags = rate_flags;
2093                 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2094                                                      local->hw.max_rate_tries);
2095         }
2096 
2097         /*
2098          * remove the radiotap header
2099          * iterator->_max_length was sanity-checked against
2100          * skb->len by iterator init
2101          */
2102         skb_pull(skb, iterator._max_length);
2103 
2104         return true;
2105 }
2106 
2107 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2108                                          struct net_device *dev)
2109 {
2110         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2111         struct ieee80211_chanctx_conf *chanctx_conf;
2112         struct ieee80211_radiotap_header *prthdr =
2113                 (struct ieee80211_radiotap_header *)skb->data;
2114         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2115         struct ieee80211_hdr *hdr;
2116         struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2117         struct cfg80211_chan_def *chandef;
2118         u16 len_rthdr;
2119         int hdrlen;
2120 
2121         /* check for not even having the fixed radiotap header part */
2122         if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2123                 goto fail; /* too short to be possibly valid */
2124 
2125         /* is it a header version we can trust to find length from? */
2126         if (unlikely(prthdr->it_version))
2127                 goto fail; /* only version 0 is supported */
2128 
2129         /* then there must be a radiotap header with a length we can use */
2130         len_rthdr = ieee80211_get_radiotap_len(skb->data);
2131 
2132         /* does the skb contain enough to deliver on the alleged length? */
2133         if (unlikely(skb->len < len_rthdr))
2134                 goto fail; /* skb too short for claimed rt header extent */
2135 
2136         /*
2137          * fix up the pointers accounting for the radiotap
2138          * header still being in there.  We are being given
2139          * a precooked IEEE80211 header so no need for
2140          * normal processing
2141          */
2142         skb_set_mac_header(skb, len_rthdr);
2143         /*
2144          * these are just fixed to the end of the rt area since we
2145          * don't have any better information and at this point, nobody cares
2146          */
2147         skb_set_network_header(skb, len_rthdr);
2148         skb_set_transport_header(skb, len_rthdr);
2149 
2150         if (skb->len < len_rthdr + 2)
2151                 goto fail;
2152 
2153         hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2154         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2155 
2156         if (skb->len < len_rthdr + hdrlen)
2157                 goto fail;
2158 
2159         /*
2160          * Initialize skb->protocol if the injected frame is a data frame
2161          * carrying a rfc1042 header
2162          */
2163         if (ieee80211_is_data(hdr->frame_control) &&
2164             skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2165                 u8 *payload = (u8 *)hdr + hdrlen;
2166 
2167                 if (ether_addr_equal(payload, rfc1042_header))
2168                         skb->protocol = cpu_to_be16((payload[6] << 8) |
2169                                                     payload[7]);
2170         }
2171 
2172         memset(info, 0, sizeof(*info));
2173 
2174         info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2175                       IEEE80211_TX_CTL_INJECTED;
2176 
2177         rcu_read_lock();
2178 
2179         /*
2180          * We process outgoing injected frames that have a local address
2181          * we handle as though they are non-injected frames.
2182          * This code here isn't entirely correct, the local MAC address
2183          * isn't always enough to find the interface to use; for proper
2184          * VLAN/WDS support we will need a different mechanism (which
2185          * likely isn't going to be monitor interfaces).
2186          */
2187         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2188 
2189         list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2190                 if (!ieee80211_sdata_running(tmp_sdata))
2191                         continue;
2192                 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2193                     tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2194                     tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2195                         continue;
2196                 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2197                         sdata = tmp_sdata;
2198                         break;
2199                 }
2200         }
2201 
2202         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2203         if (!chanctx_conf) {
2204                 tmp_sdata = rcu_dereference(local->monitor_sdata);
2205                 if (tmp_sdata)
2206                         chanctx_conf =
2207                                 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2208         }
2209 
2210         if (chanctx_conf)
2211                 chandef = &chanctx_conf->def;
2212         else if (!local->use_chanctx)
2213                 chandef = &local->_oper_chandef;
2214         else
2215                 goto fail_rcu;
2216 
2217         /*
2218          * Frame injection is not allowed if beaconing is not allowed
2219          * or if we need radar detection. Beaconing is usually not allowed when
2220          * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2221          * Passive scan is also used in world regulatory domains where
2222          * your country is not known and as such it should be treated as
2223          * NO TX unless the channel is explicitly allowed in which case
2224          * your current regulatory domain would not have the passive scan
2225          * flag.
2226          *
2227          * Since AP mode uses monitor interfaces to inject/TX management
2228          * frames we can make AP mode the exception to this rule once it
2229          * supports radar detection as its implementation can deal with
2230          * radar detection by itself. We can do that later by adding a
2231          * monitor flag interfaces used for AP support.
2232          */
2233         if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2234                                      sdata->vif.type))
2235                 goto fail_rcu;
2236 
2237         info->band = chandef->chan->band;
2238 
2239         /* process and remove the injection radiotap header */
2240         if (!ieee80211_parse_tx_radiotap(local, skb))
2241                 goto fail_rcu;
2242 
2243         ieee80211_xmit(sdata, NULL, skb);
2244         rcu_read_unlock();
2245 
2246         return NETDEV_TX_OK;
2247 
2248 fail_rcu:
2249         rcu_read_unlock();
2250 fail:
2251         dev_kfree_skb(skb);
2252         return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2253 }
2254 
2255 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2256 {
2257         u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2258 
2259         return ethertype == ETH_P_TDLS &&
2260                skb->len > 14 &&
2261                skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2262 }
2263 
2264 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2265                                    struct sk_buff *skb,
2266                                    struct sta_info **sta_out)
2267 {
2268         struct sta_info *sta;
2269 
2270         switch (sdata->vif.type) {
2271         case NL80211_IFTYPE_AP_VLAN:
2272                 sta = rcu_dereference(sdata->u.vlan.sta);
2273                 if (sta) {
2274                         *sta_out = sta;
2275                         return 0;
2276                 } else if (sdata->wdev.use_4addr) {
2277                         return -ENOLINK;
2278                 }
2279                 /* fall through */
2280         case NL80211_IFTYPE_AP:
2281         case NL80211_IFTYPE_OCB:
2282         case NL80211_IFTYPE_ADHOC:
2283                 if (is_multicast_ether_addr(skb->data)) {
2284                         *sta_out = ERR_PTR(-ENOENT);
2285                         return 0;
2286                 }
2287                 sta = sta_info_get_bss(sdata, skb->data);
2288                 break;
2289         case NL80211_IFTYPE_WDS:
2290                 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2291                 break;
2292 #ifdef CONFIG_MAC80211_MESH
2293         case NL80211_IFTYPE_MESH_POINT:
2294                 /* determined much later */
2295                 *sta_out = NULL;
2296                 return 0;
2297 #endif
2298         case NL80211_IFTYPE_STATION:
2299                 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2300                         sta = sta_info_get(sdata, skb->data);
2301                         if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2302                                 if (test_sta_flag(sta,
2303                                                   WLAN_STA_TDLS_PEER_AUTH)) {
2304                                         *sta_out = sta;
2305                                         return 0;
2306                                 }
2307 
2308                                 /*
2309                                  * TDLS link during setup - throw out frames to
2310                                  * peer. Allow TDLS-setup frames to unauthorized
2311                                  * peers for the special case of a link teardown
2312                                  * after a TDLS sta is removed due to being
2313                                  * unreachable.
2314                                  */
2315                                 if (!ieee80211_is_tdls_setup(skb))
2316                                         return -EINVAL;
2317                         }
2318 
2319                 }
2320 
2321                 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2322                 if (!sta)
2323                         return -ENOLINK;
2324                 break;
2325         default:
2326                 return -EINVAL;
2327         }
2328 
2329         *sta_out = sta ?: ERR_PTR(-ENOENT);
2330         return 0;
2331 }
2332 
2333 /**
2334  * ieee80211_build_hdr - build 802.11 header in the given frame
2335  * @sdata: virtual interface to build the header for
2336  * @skb: the skb to build the header in
2337  * @info_flags: skb flags to set
2338  *
2339  * This function takes the skb with 802.3 header and reformats the header to
2340  * the appropriate IEEE 802.11 header based on which interface the packet is
2341  * being transmitted on.
2342  *
2343  * Note that this function also takes care of the TX status request and
2344  * potential unsharing of the SKB - this needs to be interleaved with the
2345  * header building.
2346  *
2347  * The function requires the read-side RCU lock held
2348  *
2349  * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2350  */
2351 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2352                                            struct sk_buff *skb, u32 info_flags,
2353                                            struct sta_info *sta)
2354 {
2355         struct ieee80211_local *local = sdata->local;
2356         struct ieee80211_tx_info *info;
2357         int head_need;
2358         u16 ethertype, hdrlen,  meshhdrlen = 0;
2359         __le16 fc;
2360         struct ieee80211_hdr hdr;
2361         struct ieee80211s_hdr mesh_hdr __maybe_unused;
2362         struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2363         const u8 *encaps_data;
2364         int encaps_len, skip_header_bytes;
2365         bool wme_sta = false, authorized = false;
2366         bool tdls_peer;
2367         bool multicast;
2368         u16 info_id = 0;
2369         struct ieee80211_chanctx_conf *chanctx_conf;
2370         struct ieee80211_sub_if_data *ap_sdata;
2371         enum nl80211_band band;
2372         int ret;
2373 
2374         if (IS_ERR(sta))
2375                 sta = NULL;
2376 
2377         /* convert Ethernet header to proper 802.11 header (based on
2378          * operation mode) */
2379         ethertype = (skb->data[12] << 8) | skb->data[13];
2380         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2381 
2382         switch (sdata->vif.type) {
2383         case NL80211_IFTYPE_AP_VLAN:
2384                 if (sdata->wdev.use_4addr) {
2385                         fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2386                         /* RA TA DA SA */
2387                         memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2388                         memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2389                         memcpy(hdr.addr3, skb->data, ETH_ALEN);
2390                         memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2391                         hdrlen = 30;
2392                         authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2393                         wme_sta = sta->sta.wme;
2394                 }
2395                 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2396                                         u.ap);
2397                 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2398                 if (!chanctx_conf) {
2399                         ret = -ENOTCONN;
2400                         goto free;
2401                 }
2402                 band = chanctx_conf->def.chan->band;
2403                 if (sdata->wdev.use_4addr)
2404                         break;
2405                 /* fall through */
2406         case NL80211_IFTYPE_AP:
2407                 if (sdata->vif.type == NL80211_IFTYPE_AP)
2408                         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2409                 if (!chanctx_conf) {
2410                         ret = -ENOTCONN;
2411                         goto free;
2412                 }
2413                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2414                 /* DA BSSID SA */
2415                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2416                 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2417                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2418                 hdrlen = 24;
2419                 band = chanctx_conf->def.chan->band;
2420                 break;
2421         case NL80211_IFTYPE_WDS:
2422                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2423                 /* RA TA DA SA */
2424                 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2425                 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2426                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2427                 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2428                 hdrlen = 30;
2429                 /*
2430                  * This is the exception! WDS style interfaces are prohibited
2431                  * when channel contexts are in used so this must be valid
2432                  */
2433                 band = local->hw.conf.chandef.chan->band;
2434                 break;
2435 #ifdef CONFIG_MAC80211_MESH
2436         case NL80211_IFTYPE_MESH_POINT:
2437                 if (!is_multicast_ether_addr(skb->data)) {
2438                         struct sta_info *next_hop;
2439                         bool mpp_lookup = true;
2440 
2441                         mpath = mesh_path_lookup(sdata, skb->data);
2442                         if (mpath) {
2443                                 mpp_lookup = false;
2444                                 next_hop = rcu_dereference(mpath->next_hop);
2445                                 if (!next_hop ||
2446                                     !(mpath->flags & (MESH_PATH_ACTIVE |
2447                                                       MESH_PATH_RESOLVING)))
2448                                         mpp_lookup = true;
2449                         }
2450 
2451                         if (mpp_lookup) {
2452                                 mppath = mpp_path_lookup(sdata, skb->data);
2453                                 if (mppath)
2454                                         mppath->exp_time = jiffies;
2455                         }
2456 
2457                         if (mppath && mpath)
2458                                 mesh_path_del(sdata, mpath->dst);
2459                 }
2460 
2461                 /*
2462                  * Use address extension if it is a packet from
2463                  * another interface or if we know the destination
2464                  * is being proxied by a portal (i.e. portal address
2465                  * differs from proxied address)
2466                  */
2467                 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2468                     !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2469                         hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2470                                         skb->data, skb->data + ETH_ALEN);
2471                         meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2472                                                                NULL, NULL);
2473                 } else {
2474                         /* DS -> MBSS (802.11-2012 13.11.3.3).
2475                          * For unicast with unknown forwarding information,
2476                          * destination might be in the MBSS or if that fails
2477                          * forwarded to another mesh gate. In either case
2478                          * resolution will be handled in ieee80211_xmit(), so
2479                          * leave the original DA. This also works for mcast */
2480                         const u8 *mesh_da = skb->data;
2481 
2482                         if (mppath)
2483                                 mesh_da = mppath->mpp;
2484                         else if (mpath)
2485                                 mesh_da = mpath->dst;
2486 
2487                         hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2488                                         mesh_da, sdata->vif.addr);
2489                         if (is_multicast_ether_addr(mesh_da))
2490                                 /* DA TA mSA AE:SA */
2491                                 meshhdrlen = ieee80211_new_mesh_header(
2492                                                 sdata, &mesh_hdr,
2493                                                 skb->data + ETH_ALEN, NULL);
2494                         else
2495                                 /* RA TA mDA mSA AE:DA SA */
2496                                 meshhdrlen = ieee80211_new_mesh_header(
2497                                                 sdata, &mesh_hdr, skb->data,
2498                                                 skb->data + ETH_ALEN);
2499 
2500                 }
2501                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2502                 if (!chanctx_conf) {
2503                         ret = -ENOTCONN;
2504                         goto free;
2505                 }
2506                 band = chanctx_conf->def.chan->band;
2507                 break;
2508 #endif
2509         case NL80211_IFTYPE_STATION:
2510                 /* we already did checks when looking up the RA STA */
2511                 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2512 
2513                 if (tdls_peer) {
2514                         /* DA SA BSSID */
2515                         memcpy(hdr.addr1, skb->data, ETH_ALEN);
2516                         memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2517                         memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2518                         hdrlen = 24;
2519                 }  else if (sdata->u.mgd.use_4addr &&
2520                             cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2521                         fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2522                                           IEEE80211_FCTL_TODS);
2523                         /* RA TA DA SA */
2524                         memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2525                         memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2526                         memcpy(hdr.addr3, skb->data, ETH_ALEN);
2527                         memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2528                         hdrlen = 30;
2529                 } else {
2530                         fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2531                         /* BSSID SA DA */
2532                         memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2533                         memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2534                         memcpy(hdr.addr3, skb->data, ETH_ALEN);
2535                         hdrlen = 24;
2536                 }
2537                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2538                 if (!chanctx_conf) {
2539                         ret = -ENOTCONN;
2540                         goto free;
2541                 }
2542                 band = chanctx_conf->def.chan->band;
2543                 break;
2544         case NL80211_IFTYPE_OCB:
2545                 /* DA SA BSSID */
2546                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2547                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2548                 eth_broadcast_addr(hdr.addr3);
2549                 hdrlen = 24;
2550                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2551                 if (!chanctx_conf) {
2552                         ret = -ENOTCONN;
2553                         goto free;
2554                 }
2555                 band = chanctx_conf->def.chan->band;
2556                 break;
2557         case NL80211_IFTYPE_ADHOC:
2558                 /* DA SA BSSID */
2559                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2560                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2561                 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2562                 hdrlen = 24;
2563                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2564                 if (!chanctx_conf) {
2565                         ret = -ENOTCONN;
2566                         goto free;
2567                 }
2568                 band = chanctx_conf->def.chan->band;
2569                 break;
2570         default:
2571                 ret = -EINVAL;
2572                 goto free;
2573         }
2574 
2575         multicast = is_multicast_ether_addr(hdr.addr1);
2576 
2577         /* sta is always NULL for mesh */
2578         if (sta) {
2579                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2580                 wme_sta = sta->sta.wme;
2581         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2582                 /* For mesh, the use of the QoS header is mandatory */
2583                 wme_sta = true;
2584         }
2585 
2586         /* receiver does QoS (which also means we do) use it */
2587         if (wme_sta) {
2588                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2589                 hdrlen += 2;
2590         }
2591 
2592         /*
2593          * Drop unicast frames to unauthorised stations unless they are
2594          * EAPOL frames from the local station.
2595          */
2596         if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2597                      (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2598                      !multicast && !authorized &&
2599                      (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2600                       !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2601 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2602                 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2603                                     sdata->name, hdr.addr1);
2604 #endif
2605 
2606                 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2607 
2608                 ret = -EPERM;
2609                 goto free;
2610         }
2611 
2612         if (unlikely(!multicast && skb->sk &&
2613                      skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2614                 struct sk_buff *ack_skb = skb_clone_sk(skb);
2615 
2616                 if (ack_skb) {
2617                         unsigned long flags;
2618                         int id;
2619 
2620                         spin_lock_irqsave(&local->ack_status_lock, flags);
2621                         id = idr_alloc(&local->ack_status_frames, ack_skb,
2622                                        1, 0x10000, GFP_ATOMIC);
2623                         spin_unlock_irqrestore(&local->ack_status_lock, flags);
2624 
2625                         if (id >= 0) {
2626                                 info_id = id;
2627                                 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2628                         } else {
2629                                 kfree_skb(ack_skb);
2630                         }
2631                 }
2632         }
2633 
2634         /*
2635          * If the skb is shared we need to obtain our own copy.
2636          */
2637         if (skb_shared(skb)) {
2638                 struct sk_buff *tmp_skb = skb;
2639 
2640                 /* can't happen -- skb is a clone if info_id != 0 */
2641                 WARN_ON(info_id);
2642 
2643                 skb = skb_clone(skb, GFP_ATOMIC);
2644                 kfree_skb(tmp_skb);
2645 
2646                 if (!skb) {
2647                         ret = -ENOMEM;
2648                         goto free;
2649                 }
2650         }
2651 
2652         hdr.frame_control = fc;
2653         hdr.duration_id = 0;
2654         hdr.seq_ctrl = 0;
2655 
2656         skip_header_bytes = ETH_HLEN;
2657         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2658                 encaps_data = bridge_tunnel_header;
2659                 encaps_len = sizeof(bridge_tunnel_header);
2660                 skip_header_bytes -= 2;
2661         } else if (ethertype >= ETH_P_802_3_MIN) {
2662                 encaps_data = rfc1042_header;
2663                 encaps_len = sizeof(rfc1042_header);
2664                 skip_header_bytes -= 2;
2665         } else {
2666                 encaps_data = NULL;
2667                 encaps_len = 0;
2668         }
2669 
2670         skb_pull(skb, skip_header_bytes);
2671         head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2672 
2673         /*
2674          * So we need to modify the skb header and hence need a copy of
2675          * that. The head_need variable above doesn't, so far, include
2676          * the needed header space that we don't need right away. If we
2677          * can, then we don't reallocate right now but only after the
2678          * frame arrives at the master device (if it does...)
2679          *
2680          * If we cannot, however, then we will reallocate to include all
2681          * the ever needed space. Also, if we need to reallocate it anyway,
2682          * make it big enough for everything we may ever need.
2683          */
2684 
2685         if (head_need > 0 || skb_cloned(skb)) {
2686                 head_need += sdata->encrypt_headroom;
2687                 head_need += local->tx_headroom;
2688                 head_need = max_t(int, 0, head_need);
2689                 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2690                         ieee80211_free_txskb(&local->hw, skb);
2691                         skb = NULL;
2692                         return ERR_PTR(-ENOMEM);
2693                 }
2694         }
2695 
2696         if (encaps_data)
2697                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2698 
2699 #ifdef CONFIG_MAC80211_MESH
2700         if (meshhdrlen > 0)
2701                 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2702 #endif
2703 
2704         if (ieee80211_is_data_qos(fc)) {
2705                 __le16 *qos_control;
2706 
2707                 qos_control = (__le16 *) skb_push(skb, 2);
2708                 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2709                 /*
2710                  * Maybe we could actually set some fields here, for now just
2711                  * initialise to zero to indicate no special operation.
2712                  */
2713                 *qos_control = 0;
2714         } else
2715                 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2716 
2717         skb_reset_mac_header(skb);
2718 
2719         info = IEEE80211_SKB_CB(skb);
2720         memset(info, 0, sizeof(*info));
2721 
2722         info->flags = info_flags;
2723         info->ack_frame_id = info_id;
2724         info->band = band;
2725 
2726         return skb;
2727  free:
2728         kfree_skb(skb);
2729         return ERR_PTR(ret);
2730 }
2731 
2732 /*
2733  * fast-xmit overview
2734  *
2735  * The core idea of this fast-xmit is to remove per-packet checks by checking
2736  * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2737  * checks that are needed to get the sta->fast_tx pointer assigned, after which
2738  * much less work can be done per packet. For example, fragmentation must be
2739  * disabled or the fast_tx pointer will not be set. All the conditions are seen
2740  * in the code here.
2741  *
2742  * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2743  * header and other data to aid packet processing in ieee80211_xmit_fast().
2744  *
2745  * The most difficult part of this is that when any of these assumptions
2746  * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2747  * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2748  * since the per-packet code no longer checks the conditions. This is reflected
2749  * by the calls to these functions throughout the rest of the code, and must be
2750  * maintained if any of the TX path checks change.
2751  */
2752 
2753 void ieee80211_check_fast_xmit(struct sta_info *sta)
2754 {
2755         struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2756         struct ieee80211_local *local = sta->local;
2757         struct ieee80211_sub_if_data *sdata = sta->sdata;
2758         struct ieee80211_hdr *hdr = (void *)build.hdr;
2759         struct ieee80211_chanctx_conf *chanctx_conf;
2760         __le16 fc;
2761 
2762         if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2763                 return;
2764 
2765         /* Locking here protects both the pointer itself, and against concurrent
2766          * invocations winning data access races to, e.g., the key pointer that
2767          * is used.
2768          * Without it, the invocation of this function right after the key
2769          * pointer changes wouldn't be sufficient, as another CPU could access
2770          * the pointer, then stall, and then do the cache update after the CPU
2771          * that invalidated the key.
2772          * With the locking, such scenarios cannot happen as the check for the
2773          * key and the fast-tx assignment are done atomically, so the CPU that
2774          * modifies the key will either wait or other one will see the key
2775          * cleared/changed already.
2776          */
2777         spin_lock_bh(&sta->lock);
2778         if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2779             !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2780             sdata->vif.type == NL80211_IFTYPE_STATION)
2781                 goto out;
2782 
2783         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2784                 goto out;
2785 
2786         if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2787             test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2788             test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2789             test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2790                 goto out;
2791 
2792         if (sdata->noack_map)
2793                 goto out;
2794 
2795         /* fast-xmit doesn't handle fragmentation at all */
2796         if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2797             !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
2798                 goto out;
2799 
2800         rcu_read_lock();
2801         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2802         if (!chanctx_conf) {
2803                 rcu_read_unlock();
2804                 goto out;
2805         }
2806         build.band = chanctx_conf->def.chan->band;
2807         rcu_read_unlock();
2808 
2809         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2810 
2811         switch (sdata->vif.type) {
2812         case NL80211_IFTYPE_ADHOC:
2813                 /* DA SA BSSID */
2814                 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2815                 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2816                 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2817                 build.hdr_len = 24;
2818                 break;
2819         case NL80211_IFTYPE_STATION:
2820                 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2821                         /* DA SA BSSID */
2822                         build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2823                         build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2824                         memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2825                         build.hdr_len = 24;
2826                         break;
2827                 }
2828 
2829                 if (sdata->u.mgd.use_4addr) {
2830                         /* non-regular ethertype cannot use the fastpath */
2831                         fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2832                                           IEEE80211_FCTL_TODS);
2833                         /* RA TA DA SA */
2834                         memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2835                         memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2836                         build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2837                         build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2838                         build.hdr_len = 30;
2839                         break;
2840                 }
2841                 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2842                 /* BSSID SA DA */
2843                 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2844                 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2845                 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2846                 build.hdr_len = 24;
2847                 break;
2848         case NL80211_IFTYPE_AP_VLAN:
2849                 if (sdata->wdev.use_4addr) {
2850                         fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2851                                           IEEE80211_FCTL_TODS);
2852                         /* RA TA DA SA */
2853                         memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2854                         memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2855                         build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2856                         build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2857                         build.hdr_len = 30;
2858                         break;
2859                 }
2860                 /* fall through */
2861         case NL80211_IFTYPE_AP:
2862                 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2863                 /* DA BSSID SA */
2864                 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2865                 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2866                 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2867                 build.hdr_len = 24;
2868                 break;
2869         default:
2870                 /* not handled on fast-xmit */
2871                 goto out;
2872         }
2873 
2874         if (sta->sta.wme) {
2875                 build.hdr_len += 2;
2876                 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2877         }
2878 
2879         /* We store the key here so there's no point in using rcu_dereference()
2880          * but that's fine because the code that changes the pointers will call
2881          * this function after doing so. For a single CPU that would be enough,
2882          * for multiple see the comment above.
2883          */
2884         build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2885         if (!build.key)
2886                 build.key = rcu_access_pointer(sdata->default_unicast_key);
2887         if (build.key) {
2888                 bool gen_iv, iv_spc, mmic;
2889 
2890                 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2891                 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2892                 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
2893 
2894                 /* don't handle software crypto */
2895                 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2896                         goto out;
2897 
2898                 switch (build.key->conf.cipher) {
2899                 case WLAN_CIPHER_SUITE_CCMP:
2900                 case WLAN_CIPHER_SUITE_CCMP_256:
2901                         /* add fixed key ID */
2902                         if (gen_iv) {
2903                                 (build.hdr + build.hdr_len)[3] =
2904                                         0x20 | (build.key->conf.keyidx << 6);
2905                                 build.pn_offs = build.hdr_len;
2906                         }
2907                         if (gen_iv || iv_spc)
2908                                 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2909                         break;
2910                 case WLAN_CIPHER_SUITE_GCMP:
2911                 case WLAN_CIPHER_SUITE_GCMP_256:
2912                         /* add fixed key ID */
2913                         if (gen_iv) {
2914                                 (build.hdr + build.hdr_len)[3] =
2915                                         0x20 | (build.key->conf.keyidx << 6);
2916                                 build.pn_offs = build.hdr_len;
2917                         }
2918                         if (gen_iv || iv_spc)
2919                                 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2920                         break;
2921                 case WLAN_CIPHER_SUITE_TKIP:
2922                         /* cannot handle MMIC or IV generation in xmit-fast */
2923                         if (mmic || gen_iv)
2924                                 goto out;
2925                         if (iv_spc)
2926                                 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2927                         break;
2928                 case WLAN_CIPHER_SUITE_WEP40:
2929                 case WLAN_CIPHER_SUITE_WEP104:
2930                         /* cannot handle IV generation in fast-xmit */
2931                         if (gen_iv)
2932                                 goto out;
2933                         if (iv_spc)
2934                                 build.hdr_len += IEEE80211_WEP_IV_LEN;
2935                         break;
2936                 case WLAN_CIPHER_SUITE_AES_CMAC:
2937                 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2938                 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2939                 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2940                         WARN(1,
2941                              "management cipher suite 0x%x enabled for data\n",
2942                              build.key->conf.cipher);
2943                         goto out;
2944                 default:
2945                         /* we don't know how to generate IVs for this at all */
2946                         if (WARN_ON(gen_iv))
2947                                 goto out;
2948                         /* pure hardware keys are OK, of course */
2949                         if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2950                                 break;
2951                         /* cipher scheme might require space allocation */
2952                         if (iv_spc &&
2953                             build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2954                                 goto out;
2955                         if (iv_spc)
2956                                 build.hdr_len += build.key->conf.iv_len;
2957                 }
2958 
2959                 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2960         }
2961 
2962         hdr->frame_control = fc;
2963 
2964         memcpy(build.hdr + build.hdr_len,
2965                rfc1042_header,  sizeof(rfc1042_header));
2966         build.hdr_len += sizeof(rfc1042_header);
2967 
2968         fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2969         /* if the kmemdup fails, continue w/o fast_tx */
2970         if (!fast_tx)
2971                 goto out;
2972 
2973  out:
2974         /* we might have raced against another call to this function */
2975         old = rcu_dereference_protected(sta->fast_tx,
2976                                         lockdep_is_held(&sta->lock));
2977         rcu_assign_pointer(sta->fast_tx, fast_tx);
2978         if (old)
2979                 kfree_rcu(old, rcu_head);
2980         spin_unlock_bh(&sta->lock);
2981 }
2982 
2983 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2984 {
2985         struct sta_info *sta;
2986 
2987         rcu_read_lock();
2988         list_for_each_entry_rcu(sta, &local->sta_list, list)
2989                 ieee80211_check_fast_xmit(sta);
2990         rcu_read_unlock();
2991 }
2992 
2993 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
2994 {
2995         struct ieee80211_local *local = sdata->local;
2996         struct sta_info *sta;
2997 
2998         rcu_read_lock();
2999 
3000         list_for_each_entry_rcu(sta, &local->sta_list, list) {
3001                 if (sdata != sta->sdata &&
3002                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3003                         continue;
3004                 ieee80211_check_fast_xmit(sta);
3005         }
3006 
3007         rcu_read_unlock();
3008 }
3009 
3010 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3011 {
3012         struct ieee80211_fast_tx *fast_tx;
3013 
3014         spin_lock_bh(&sta->lock);
3015         fast_tx = rcu_dereference_protected(sta->fast_tx,
3016                                             lockdep_is_held(&sta->lock));
3017         RCU_INIT_POINTER(sta->fast_tx, NULL);
3018         spin_unlock_bh(&sta->lock);
3019 
3020         if (fast_tx)
3021                 kfree_rcu(fast_tx, rcu_head);
3022 }
3023 
3024 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3025                                         struct sk_buff *skb, int headroom,
3026                                         int *subframe_len)
3027 {
3028         int amsdu_len = *subframe_len + sizeof(struct ethhdr);
3029         int padding = (4 - amsdu_len) & 3;
3030 
3031         if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) {
3032                 I802_DEBUG_INC(local->tx_expand_skb_head);
3033 
3034                 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) {
3035                         wiphy_debug(local->hw.wiphy,
3036                                     "failed to reallocate TX buffer\n");
3037                         return false;
3038                 }
3039         }
3040 
3041         if (padding) {
3042                 *subframe_len += padding;
3043                 memset(skb_put(skb, padding), 0, padding);
3044         }
3045 
3046         return true;
3047 }
3048 
3049 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3050                                          struct ieee80211_fast_tx *fast_tx,
3051                                          struct sk_buff *skb)
3052 {
3053         struct ieee80211_local *local = sdata->local;
3054         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3055         struct ieee80211_hdr *hdr;
3056         struct ethhdr *amsdu_hdr;
3057         int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3058         int subframe_len = skb->len - hdr_len;
3059         void *data;
3060         u8 *qc, *h_80211_src, *h_80211_dst;
3061         const u8 *bssid;
3062 
3063         if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3064                 return false;
3065 
3066         if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3067                 return true;
3068 
3069         if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr),
3070                                          &subframe_len))
3071                 return false;
3072 
3073         data = skb_push(skb, sizeof(*amsdu_hdr));
3074         memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3075         hdr = data;
3076         amsdu_hdr = data + hdr_len;
3077         /* h_80211_src/dst is addr* field within hdr */
3078         h_80211_src = data + fast_tx->sa_offs;
3079         h_80211_dst = data + fast_tx->da_offs;
3080 
3081         amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3082         ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3083         ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3084 
3085         /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3086          * fields needs to be changed to BSSID for A-MSDU frames depending
3087          * on FromDS/ToDS values.
3088          */
3089         switch (sdata->vif.type) {
3090         case NL80211_IFTYPE_STATION:
3091                 bssid = sdata->u.mgd.bssid;
3092                 break;
3093         case NL80211_IFTYPE_AP:
3094         case NL80211_IFTYPE_AP_VLAN:
3095                 bssid = sdata->vif.addr;
3096                 break;
3097         default:
3098                 bssid = NULL;
3099         }
3100 
3101         if (bssid && ieee80211_has_fromds(hdr->frame_control))
3102                 ether_addr_copy(h_80211_src, bssid);
3103 
3104         if (bssid && ieee80211_has_tods(hdr->frame_control))
3105                 ether_addr_copy(h_80211_dst, bssid);
3106 
3107         qc = ieee80211_get_qos_ctl(hdr);
3108         *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3109 
3110         info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3111 
3112         return true;
3113 }
3114 
3115 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3116                                       struct sta_info *sta,
3117                                       struct ieee80211_fast_tx *fast_tx,
3118                                       struct sk_buff *skb)
3119 {
3120         struct ieee80211_local *local = sdata->local;
3121         struct fq *fq = &local->fq;
3122         struct fq_tin *tin;
3123         struct fq_flow *flow;
3124         u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3125         struct ieee80211_txq *txq = sta->sta.txq[tid];
3126         struct txq_info *txqi;
3127         struct sk_buff **frag_tail, *head;
3128         int subframe_len = skb->len - ETH_ALEN;
3129         u8 max_subframes = sta->sta.max_amsdu_subframes;
3130         int max_frags = local->hw.max_tx_fragments;
3131         int max_amsdu_len = sta->sta.max_amsdu_len;
3132         __be16 len;
3133         void *data;
3134         bool ret = false;
3135         unsigned int orig_len;
3136         int n = 1, nfrags;
3137 
3138         if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3139                 return false;
3140 
3141         if (!txq)
3142                 return false;
3143 
3144         txqi = to_txq_info(txq);
3145         if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3146                 return false;
3147 
3148         if (sta->sta.max_rc_amsdu_len)
3149                 max_amsdu_len = min_t(int, max_amsdu_len,
3150                                       sta->sta.max_rc_amsdu_len);
3151 
3152         spin_lock_bh(&fq->lock);
3153 
3154         /* TODO: Ideally aggregation should be done on dequeue to remain
3155          * responsive to environment changes.
3156          */
3157 
3158         tin = &txqi->tin;
3159         flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3160         head = skb_peek_tail(&flow->queue);
3161         if (!head)
3162                 goto out;
3163 
3164         orig_len = head->len;
3165 
3166         if (skb->len + head->len > max_amsdu_len)
3167                 goto out;
3168 
3169         if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3170                 goto out;
3171 
3172         nfrags = 1 + skb_shinfo(skb)->nr_frags;
3173         nfrags += 1 + skb_shinfo(head)->nr_frags;
3174         frag_tail = &skb_shinfo(head)->frag_list;
3175         while (*frag_tail) {
3176                 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3177                 frag_tail = &(*frag_tail)->next;
3178                 n++;
3179         }
3180 
3181         if (max_subframes && n > max_subframes)
3182                 goto out;
3183 
3184         if (max_frags && nfrags > max_frags)
3185                 goto out;
3186 
3187         if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2,
3188                                          &subframe_len))
3189                 goto out;
3190 
3191         ret = true;
3192         data = skb_push(skb, ETH_ALEN + 2);
3193         memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3194 
3195         data += 2 * ETH_ALEN;
3196         len = cpu_to_be16(subframe_len);
3197         memcpy(data, &len, 2);
3198         memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3199 
3200         head->len += skb->len;
3201         head->data_len += skb->len;
3202         *frag_tail = skb;
3203 
3204         flow->backlog += head->len - orig_len;
3205         tin->backlog_bytes += head->len - orig_len;
3206 
3207         fq_recalc_backlog(fq, tin, flow);
3208 
3209 out:
3210         spin_unlock_bh(&fq->lock);
3211 
3212         return ret;
3213 }
3214 
3215 /*
3216  * Can be called while the sta lock is held. Anything that can cause packets to
3217  * be generated will cause deadlock!
3218  */
3219 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3220                                        struct sta_info *sta, u8 pn_offs,
3221                                        struct ieee80211_key *key,
3222                                        struct sk_buff *skb)
3223 {
3224         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3225         struct ieee80211_hdr *hdr = (void *)skb->data;
3226         u8 tid = IEEE80211_NUM_TIDS;
3227 
3228         if (key)
3229                 info->control.hw_key = &key->conf;
3230 
3231         ieee80211_tx_stats(skb->dev, skb->len);
3232 
3233         if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3234                 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3235                 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3236         } else {
3237                 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3238                 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3239                 sdata->sequence_number += 0x10;
3240         }
3241 
3242         if (skb_shinfo(skb)->gso_size)
3243                 sta->tx_stats.msdu[tid] +=
3244                         DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3245         else
3246                 sta->tx_stats.msdu[tid]++;
3247 
3248         info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3249 
3250         /* statistics normally done by ieee80211_tx_h_stats (but that
3251          * has to consider fragmentation, so is more complex)
3252          */
3253         sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3254         sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3255 
3256         if (pn_offs) {
3257                 u64 pn;
3258                 u8 *crypto_hdr = skb->data + pn_offs;
3259 
3260                 switch (key->conf.cipher) {
3261                 case WLAN_CIPHER_SUITE_CCMP:
3262                 case WLAN_CIPHER_SUITE_CCMP_256:
3263                 case WLAN_CIPHER_SUITE_GCMP:
3264                 case WLAN_CIPHER_SUITE_GCMP_256:
3265                         pn = atomic64_inc_return(&key->conf.tx_pn);
3266                         crypto_hdr[0] = pn;
3267                         crypto_hdr[1] = pn >> 8;
3268                         crypto_hdr[4] = pn >> 16;
3269                         crypto_hdr[5] = pn >> 24;
3270                         crypto_hdr[6] = pn >> 32;
3271                         crypto_hdr[7] = pn >> 40;
3272                         break;
3273                 }
3274         }
3275 }
3276 
3277 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3278                                 struct sta_info *sta,
3279                                 struct ieee80211_fast_tx *fast_tx,
3280                                 struct sk_buff *skb)
3281 {
3282         struct ieee80211_local *local = sdata->local;
3283         u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3284         int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3285         int hw_headroom = sdata->local->hw.extra_tx_headroom;
3286         struct ethhdr eth;
3287         struct ieee80211_tx_info *info;
3288         struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3289         struct ieee80211_tx_data tx;
3290         ieee80211_tx_result r;
3291         struct tid_ampdu_tx *tid_tx = NULL;
3292         u8 tid = IEEE80211_NUM_TIDS;
3293 
3294         /* control port protocol needs a lot of special handling */
3295         if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3296                 return false;
3297 
3298         /* only RFC 1042 SNAP */
3299         if (ethertype < ETH_P_802_3_MIN)
3300                 return false;
3301 
3302         /* don't handle TX status request here either */
3303         if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3304                 return false;
3305 
3306         if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3307                 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3308                 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3309                 if (tid_tx) {
3310                         if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3311                                 return false;
3312                         if (tid_tx->timeout)
3313                                 tid_tx->last_tx = jiffies;
3314                 }
3315         }
3316 
3317         /* after this point (skb is modified) we cannot return false */
3318 
3319         if (skb_shared(skb)) {
3320                 struct sk_buff *tmp_skb = skb;
3321 
3322                 skb = skb_clone(skb, GFP_ATOMIC);
3323                 kfree_skb(tmp_skb);
3324 
3325                 if (!skb)
3326                         return true;
3327         }
3328 
3329         if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3330             ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3331                 return true;
3332 
3333         /* will not be crypto-handled beyond what we do here, so use false
3334          * as the may-encrypt argument for the resize to not account for
3335          * more room than we already have in 'extra_head'
3336          */
3337         if (unlikely(ieee80211_skb_resize(sdata, skb,
3338                                           max_t(int, extra_head + hw_headroom -
3339                                                      skb_headroom(skb), 0),
3340                                           false))) {
3341                 kfree_skb(skb);
3342                 return true;
3343         }
3344 
3345         memcpy(&eth, skb->data, ETH_HLEN - 2);
3346         hdr = (void *)skb_push(skb, extra_head);
3347         memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3348         memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3349         memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3350 
3351         info = IEEE80211_SKB_CB(skb);
3352         memset(info, 0, sizeof(*info));
3353         info->band = fast_tx->band;
3354         info->control.vif = &sdata->vif;
3355         info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3356                       IEEE80211_TX_CTL_DONTFRAG |
3357                       (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3358         info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3359 
3360         if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3361                 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3362                 *ieee80211_get_qos_ctl(hdr) = tid;
3363         }
3364 
3365         __skb_queue_head_init(&tx.skbs);
3366 
3367         tx.flags = IEEE80211_TX_UNICAST;
3368         tx.local = local;
3369         tx.sdata = sdata;
3370         tx.sta = sta;
3371         tx.key = fast_tx->key;
3372 
3373         if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3374                 tx.skb = skb;
3375                 r = ieee80211_tx_h_rate_ctrl(&tx);
3376                 skb = tx.skb;
3377                 tx.skb = NULL;
3378 
3379                 if (r != TX_CONTINUE) {
3380                         if (r != TX_QUEUED)
3381                                 kfree_skb(skb);
3382                         return true;
3383                 }
3384         }
3385 
3386         if (ieee80211_queue_skb(local, sdata, sta, skb))
3387                 return true;
3388 
3389         ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3390                                    fast_tx->key, skb);
3391 
3392         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3393                 sdata = container_of(sdata->bss,
3394                                      struct ieee80211_sub_if_data, u.ap);
3395 
3396         __skb_queue_tail(&tx.skbs, skb);
3397         ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3398         return true;
3399 }
3400 
3401 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3402                                      struct ieee80211_txq *txq)
3403 {
3404         struct ieee80211_local *local = hw_to_local(hw);
3405         struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3406         struct ieee80211_hdr *hdr;
3407         struct sk_buff *skb = NULL;
3408         struct fq *fq = &local->fq;
3409         struct fq_tin *tin = &txqi->tin;
3410         struct ieee80211_tx_info *info;
3411         struct ieee80211_tx_data tx;
3412         ieee80211_tx_result r;
3413 
3414         spin_lock_bh(&fq->lock);
3415 
3416         if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
3417                 goto out;
3418 
3419         /* Make sure fragments stay together. */
3420         skb = __skb_dequeue(&txqi->frags);
3421         if (skb)
3422                 goto out;
3423 
3424 begin:
3425         skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3426         if (!skb)
3427                 goto out;
3428 
3429         ieee80211_set_skb_vif(skb, txqi);
3430 
3431         hdr = (struct ieee80211_hdr *)skb->data;
3432         info = IEEE80211_SKB_CB(skb);
3433 
3434         memset(&tx, 0, sizeof(tx));
3435         __skb_queue_head_init(&tx.skbs);
3436         tx.local = local;
3437         tx.skb = skb;
3438         tx.sdata = vif_to_sdata(info->control.vif);
3439 
3440         if (txq->sta)
3441                 tx.sta = container_of(txq->sta, struct sta_info, sta);
3442 
3443         /*
3444          * The key can be removed while the packet was queued, so need to call
3445          * this here to get the current key.
3446          */
3447         r = ieee80211_tx_h_select_key(&tx);
3448         if (r != TX_CONTINUE) {
3449                 ieee80211_free_txskb(&local->hw, skb);
3450                 goto begin;
3451         }
3452 
3453         if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3454                 info->flags |= IEEE80211_TX_CTL_AMPDU;
3455         else
3456                 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3457 
3458         if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3459                 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3460                                                     sta);
3461                 u8 pn_offs = 0;
3462 
3463                 if (tx.key &&
3464                     (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3465                         pn_offs = ieee80211_hdrlen(hdr->frame_control);
3466 
3467                 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3468                                            tx.key, skb);
3469         } else {
3470                 if (invoke_tx_handlers_late(&tx))
3471                         goto begin;
3472 
3473                 skb = __skb_dequeue(&tx.skbs);
3474 
3475                 if (!skb_queue_empty(&tx.skbs))
3476                         skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3477         }
3478 
3479         if (skb && skb_has_frag_list(skb) &&
3480             !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3481                 if (skb_linearize(skb)) {
3482                         ieee80211_free_txskb(&local->hw, skb);
3483                         goto begin;
3484                 }
3485         }
3486 
3487 out:
3488         spin_unlock_bh(&fq->lock);
3489 
3490         return skb;
3491 }
3492 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3493 
3494 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3495                                   struct net_device *dev,
3496                                   u32 info_flags)
3497 {
3498         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3499         struct sta_info *sta;
3500         struct sk_buff *next;
3501 
3502         if (unlikely(skb->len < ETH_HLEN)) {
3503                 kfree_skb(skb);
3504                 return;
3505         }
3506 
3507         rcu_read_lock();
3508 
3509         if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3510                 goto out_free;
3511 
3512         if (!IS_ERR_OR_NULL(sta)) {
3513                 struct ieee80211_fast_tx *fast_tx;
3514 
3515                 fast_tx = rcu_dereference(sta->fast_tx);
3516 
3517                 if (fast_tx &&
3518                     ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
3519                         goto out;
3520         }
3521 
3522         if (skb_is_gso(skb)) {
3523                 struct sk_buff *segs;
3524 
3525                 segs = skb_gso_segment(skb, 0);
3526                 if (IS_ERR(segs)) {
3527                         goto out_free;
3528                 } else if (segs) {
3529                         consume_skb(skb);
3530                         skb = segs;
3531                 }
3532         } else {
3533                 /* we cannot process non-linear frames on this path */
3534                 if (skb_linearize(skb)) {
3535                         kfree_skb(skb);
3536                         goto out;
3537                 }
3538 
3539                 /* the frame could be fragmented, software-encrypted, and other
3540                  * things so we cannot really handle checksum offload with it -
3541                  * fix it up in software before we handle anything else.
3542                  */
3543                 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3544                         skb_set_transport_header(skb,
3545                                                  skb_checksum_start_offset(skb));
3546                         if (skb_checksum_help(skb))
3547                                 goto out_free;
3548                 }
3549         }
3550 
3551         next = skb;
3552         while (next) {
3553                 skb = next;
3554                 next = skb->next;
3555 
3556                 skb->prev = NULL;
3557                 skb->next = NULL;
3558 
3559                 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3560                 if (IS_ERR(skb))
3561                         goto out;
3562 
3563                 ieee80211_tx_stats(dev, skb->len);
3564 
3565                 ieee80211_xmit(sdata, sta, skb);
3566         }
3567         goto out;
3568  out_free:
3569         kfree_skb(skb);
3570  out:
3571         rcu_read_unlock();
3572 }
3573 
3574 /**
3575  * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3576  * @skb: packet to be sent
3577  * @dev: incoming interface
3578  *
3579  * On failure skb will be freed.
3580  */
3581 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3582                                        struct net_device *dev)
3583 {
3584         __ieee80211_subif_start_xmit(skb, dev, 0);
3585         return NETDEV_TX_OK;
3586 }
3587 
3588 struct sk_buff *
3589 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3590                               struct sk_buff *skb, u32 info_flags)
3591 {
3592         struct ieee80211_hdr *hdr;
3593         struct ieee80211_tx_data tx = {
3594                 .local = sdata->local,
3595                 .sdata = sdata,
3596         };
3597         struct sta_info *sta;
3598 
3599         rcu_read_lock();
3600 
3601         if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3602                 kfree_skb(skb);
3603                 skb = ERR_PTR(-EINVAL);
3604                 goto out;
3605         }
3606 
3607         skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3608         if (IS_ERR(skb))
3609                 goto out;
3610 
3611         hdr = (void *)skb->data;
3612         tx.sta = sta_info_get(sdata, hdr->addr1);
3613         tx.skb = skb;
3614 
3615         if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3616                 rcu_read_unlock();
3617                 kfree_skb(skb);
3618                 return ERR_PTR(-EINVAL);
3619         }
3620 
3621 out:
3622         rcu_read_unlock();
3623         return skb;
3624 }
3625 
3626 /*
3627  * ieee80211_clear_tx_pending may not be called in a context where
3628  * it is possible that it packets could come in again.
3629  */
3630 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3631 {
3632         struct sk_buff *skb;
3633         int i;
3634 
3635         for (i = 0; i < local->hw.queues; i++) {
3636                 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3637                         ieee80211_free_txskb(&local->hw, skb);
3638         }
3639 }
3640 
3641 /*
3642  * Returns false if the frame couldn't be transmitted but was queued instead,
3643  * which in this case means re-queued -- take as an indication to stop sending
3644  * more pending frames.
3645  */
3646 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3647                                      struct sk_buff *skb)
3648 {
3649         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3650         struct ieee80211_sub_if_data *sdata;
3651         struct sta_info *sta;
3652         struct ieee80211_hdr *hdr;
3653         bool result;
3654         struct ieee80211_chanctx_conf *chanctx_conf;
3655 
3656         sdata = vif_to_sdata(info->control.vif);
3657 
3658         if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3659                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3660                 if (unlikely(!chanctx_conf)) {
3661                         dev_kfree_skb(skb);
3662                         return true;
3663                 }
3664                 info->band = chanctx_conf->def.chan->band;
3665                 result = ieee80211_tx(sdata, NULL, skb, true);
3666         } else {
3667                 struct sk_buff_head skbs;
3668 
3669                 __skb_queue_head_init(&skbs);
3670                 __skb_queue_tail(&skbs, skb);
3671 
3672                 hdr = (struct ieee80211_hdr *)skb->data;
3673                 sta = sta_info_get(sdata, hdr->addr1);
3674 
3675                 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3676         }
3677 
3678         return result;
3679 }
3680 
3681 /*
3682  * Transmit all pending packets. Called from tasklet.
3683  */
3684 void ieee80211_tx_pending(unsigned long data)
3685 {
3686         struct ieee80211_local *local = (struct ieee80211_local *)data;
3687         unsigned long flags;
3688         int i;
3689         bool txok;
3690 
3691         rcu_read_lock();
3692 
3693         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3694         for (i = 0; i < local->hw.queues; i++) {
3695                 /*
3696                  * If queue is stopped by something other than due to pending
3697                  * frames, or we have no pending frames, proceed to next queue.
3698                  */
3699                 if (local->queue_stop_reasons[i] ||
3700                     skb_queue_empty(&local->pending[i]))
3701                         continue;
3702 
3703                 while (!skb_queue_empty(&local->pending[i])) {
3704                         struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3705                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3706 
3707                         if (WARN_ON(!info->control.vif)) {
3708                                 ieee80211_free_txskb(&local->hw, skb);
3709                                 continue;
3710                         }
3711 
3712                         spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3713                                                 flags);
3714 
3715                         txok = ieee80211_tx_pending_skb(local, skb);
3716                         spin_lock_irqsave(&local->queue_stop_reason_lock,
3717                                           flags);
3718                         if (!txok)
3719                                 break;
3720                 }
3721 
3722                 if (skb_queue_empty(&local->pending[i]))
3723                         ieee80211_propagate_queue_wake(local, i);
3724         }
3725         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3726 
3727         rcu_read_unlock();
3728 }
3729 
3730 /* functions for drivers to get certain frames */
3731 
3732 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3733                                        struct ps_data *ps, struct sk_buff *skb,
3734                                        bool is_template)
3735 {
3736         u8 *pos, *tim;
3737         int aid0 = 0;
3738         int i, have_bits = 0, n1, n2;
3739 
3740         /* Generate bitmap for TIM only if there are any STAs in power save
3741          * mode. */
3742         if (atomic_read(&ps->num_sta_ps) > 0)
3743                 /* in the hope that this is faster than
3744                  * checking byte-for-byte */
3745                 have_bits = !bitmap_empty((unsigned long *)ps->tim,
3746                                           IEEE80211_MAX_AID+1);
3747         if (!is_template) {
3748                 if (ps->dtim_count == 0)
3749                         ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3750                 else
3751                         ps->dtim_count--;
3752         }
3753 
3754         tim = pos = (u8 *) skb_put(skb, 6);
3755         *pos++ = WLAN_EID_TIM;
3756         *pos++ = 4;
3757         *pos++ = ps->dtim_count;
3758         *pos++ = sdata->vif.bss_conf.dtim_period;
3759 
3760         if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3761                 aid0 = 1;
3762 
3763         ps->dtim_bc_mc = aid0 == 1;
3764 
3765         if (have_bits) {
3766                 /* Find largest even number N1 so that bits numbered 1 through
3767                  * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3768                  * (N2 + 1) x 8 through 2007 are 0. */
3769                 n1 = 0;
3770                 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
3771                         if (ps->tim[i]) {
3772                                 n1 = i & 0xfe;
3773                                 break;
3774                         }
3775                 }
3776                 n2 = n1;
3777                 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3778                         if (ps->tim[i]) {
3779                                 n2 = i;
3780                                 break;
3781                         }
3782                 }
3783 
3784                 /* Bitmap control */
3785                 *pos++ = n1 | aid0;
3786                 /* Part Virt Bitmap */
3787                 skb_put(skb, n2 - n1);
3788                 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3789 
3790                 tim[1] = n2 - n1 + 4;
3791         } else {
3792                 *pos++ = aid0; /* Bitmap control */
3793                 *pos++ = 0; /* Part Virt Bitmap */
3794         }
3795 }
3796 
3797 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3798                                     struct ps_data *ps, struct sk_buff *skb,
3799                                     bool is_template)
3800 {
3801         struct ieee80211_local *local = sdata->local;
3802 
3803         /*
3804          * Not very nice, but we want to allow the driver to call
3805          * ieee80211_beacon_get() as a response to the set_tim()
3806          * callback. That, however, is already invoked under the
3807          * sta_lock to guarantee consistent and race-free update
3808          * of the tim bitmap in mac80211 and the driver.
3809          */
3810         if (local->tim_in_locked_section) {
3811                 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3812         } else {
3813                 spin_lock_bh(&local->tim_lock);
3814                 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3815                 spin_unlock_bh(&local->tim_lock);
3816         }
3817 
3818         return 0;
3819 }
3820 
3821 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3822                               struct beacon_data *beacon)
3823 {
3824         struct probe_resp *resp;
3825         u8 *beacon_data;
3826         size_t beacon_data_len;
3827         int i;
3828         u8 count = beacon->csa_current_counter;
3829 
3830         switch (sdata->vif.type) {
3831         case NL80211_IFTYPE_AP:
3832                 beacon_data = beacon->tail;
3833                 beacon_data_len = beacon->tail_len;
3834                 break;
3835         case NL80211_IFTYPE_ADHOC:
3836                 beacon_data = beacon->head;
3837                 beacon_data_len = beacon->head_len;
3838                 break;
3839         case NL80211_IFTYPE_MESH_POINT:
3840                 beacon_data = beacon->head;
3841                 beacon_data_len = beacon->head_len;
3842                 break;
3843         default:
3844                 return;
3845         }
3846 
3847         rcu_read_lock();
3848         for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
3849                 resp = rcu_dereference(sdata->u.ap.probe_resp);
3850 
3851                 if (beacon->csa_counter_offsets[i]) {
3852                         if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3853                                          beacon_data_len)) {
3854                                 rcu_read_unlock();
3855                                 return;
3856                         }
3857 
3858                         beacon_data[beacon->csa_counter_offsets[i]] = count;
3859                 }
3860 
3861                 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3862                         resp->data[resp->csa_counter_offsets[i]] = count;
3863         }
3864         rcu_read_unlock();
3865 }
3866 
3867 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3868 {
3869         beacon->csa_current_counter--;
3870 
3871         /* the counter should never reach 0 */
3872         WARN_ON_ONCE(!beacon->csa_current_counter);
3873 
3874         return beacon->csa_current_counter;
3875 }
3876 
3877 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
3878 {
3879         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3880         struct beacon_data *beacon = NULL;
3881         u8 count = 0;
3882 
3883         rcu_read_lock();
3884 
3885         if (sdata->vif.type == NL80211_IFTYPE_AP)
3886                 beacon = rcu_dereference(sdata->u.ap.beacon);
3887         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3888                 beacon = rcu_dereference(sdata->u.ibss.presp);
3889         else if (ieee80211_vif_is_mesh(&sdata->vif))
3890                 beacon = rcu_dereference(sdata->u.mesh.beacon);
3891 
3892         if (!beacon)
3893                 goto unlock;
3894 
3895         count = __ieee80211_csa_update_counter(beacon);
3896 
3897 unlock:
3898         rcu_read_unlock();
3899         return count;
3900 }
3901 EXPORT_SYMBOL(ieee80211_csa_update_counter);
3902 
3903 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
3904 {
3905         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3906         struct beacon_data *beacon = NULL;
3907         u8 *beacon_data;
3908         size_t beacon_data_len;
3909         int ret = false;
3910 
3911         if (!ieee80211_sdata_running(sdata))
3912                 return false;
3913 
3914         rcu_read_lock();
3915         if (vif->type == NL80211_IFTYPE_AP) {
3916                 struct ieee80211_if_ap *ap = &sdata->u.ap;
3917 
3918                 beacon = rcu_dereference(ap->beacon);
3919                 if (WARN_ON(!beacon || !beacon->tail))
3920                         goto out;
3921                 beacon_data = beacon->tail;
3922                 beacon_data_len = beacon->tail_len;
3923         } else if (vif->type == NL80211_IFTYPE_ADHOC) {
3924                 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3925 
3926                 beacon = rcu_dereference(ifibss->presp);
3927                 if (!beacon)
3928                         goto out;
3929 
3930                 beacon_data = beacon->head;
3931                 beacon_data_len = beacon->head_len;
3932         } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
3933                 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3934 
3935                 beacon = rcu_dereference(ifmsh->beacon);
3936                 if (!beacon)
3937                         goto out;
3938 
3939                 beacon_data = beacon->head;
3940                 beacon_data_len = beacon->head_len;
3941         } else {
3942                 WARN_ON(1);
3943                 goto out;
3944         }
3945 
3946         if (!beacon->csa_counter_offsets[0])
3947                 goto out;
3948 
3949         if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
3950                 goto out;
3951 
3952         if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
3953                 ret = true;
3954  out:
3955         rcu_read_unlock();
3956 
3957         return ret;
3958 }
3959 EXPORT_SYMBOL(ieee80211_csa_is_complete);
3960 
3961 static struct sk_buff *
3962 __ieee80211_beacon_get(struct ieee80211_hw *hw,
3963                        struct ieee80211_vif *vif,
3964                        struct ieee80211_mutable_offsets *offs,
3965                        bool is_template)
3966 {
3967         struct ieee80211_local *local = hw_to_local(hw);
3968         struct beacon_data *beacon = NULL;
3969         struct sk_buff *skb = NULL;
3970         struct ieee80211_tx_info *info;
3971         struct ieee80211_sub_if_data *sdata = NULL;
3972         enum nl80211_band band;
3973         struct ieee80211_tx_rate_control txrc;
3974         struct ieee80211_chanctx_conf *chanctx_conf;
3975         int csa_off_base = 0;
3976 
3977         rcu_read_lock();
3978 
3979         sdata = vif_to_sdata(vif);
3980         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3981 
3982         if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
3983                 goto out;
3984 
3985         if (offs)
3986                 memset(offs, 0, sizeof(*offs));
3987 
3988         if (sdata->vif.type == NL80211_IFTYPE_AP) {
3989                 struct ieee80211_if_ap *ap = &sdata->u.ap;
3990 
3991                 beacon = rcu_dereference(ap->beacon);
3992                 if (beacon) {
3993                         if (beacon->csa_counter_offsets[0]) {
3994                                 if (!is_template)
3995                                         __ieee80211_csa_update_counter(beacon);
3996 
3997                                 ieee80211_set_csa(sdata, beacon);
3998                         }
3999 
4000                         /*
4001                          * headroom, head length,
4002                          * tail length and maximum TIM length
4003                          */
4004                         skb = dev_alloc_skb(local->tx_headroom +
4005                                             beacon->head_len +
4006                                             beacon->tail_len + 256 +
4007                                             local->hw.extra_beacon_tailroom);
4008                         if (!skb)
4009                                 goto out;
4010 
4011                         skb_reserve(skb, local->tx_headroom);
4012                         memcpy(skb_put(skb, beacon->head_len), beacon->head,
4013                                beacon->head_len);
4014 
4015                         ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4016                                                  is_template);
4017 
4018                         if (offs) {
4019                                 offs->tim_offset = beacon->head_len;
4020                                 offs->tim_length = skb->len - beacon->head_len;
4021 
4022                                 /* for AP the csa offsets are from tail */
4023                                 csa_off_base = skb->len;
4024                         }
4025 
4026                         if (beacon->tail)
4027                                 memcpy(skb_put(skb, beacon->tail_len),
4028                                        beacon->tail, beacon->tail_len);
4029                 } else
4030                         goto out;
4031         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
4032                 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4033                 struct ieee80211_hdr *hdr;
4034 
4035                 beacon = rcu_dereference(ifibss->presp);
4036                 if (!beacon)
4037                         goto out;
4038 
4039                 if (beacon->csa_counter_offsets[0]) {
4040                         if (!is_template)
4041                                 __ieee80211_csa_update_counter(beacon);
4042 
4043                         ieee80211_set_csa(sdata, beacon);
4044                 }
4045 
4046                 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
4047                                     local->hw.extra_beacon_tailroom);
4048                 if (!skb)
4049                         goto out;
4050                 skb_reserve(skb, local->tx_headroom);
4051                 memcpy(skb_put(skb, beacon->head_len), beacon->head,
4052                        beacon->head_len);
4053 
4054                 hdr = (struct ieee80211_hdr *) skb->data;
4055                 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4056                                                  IEEE80211_STYPE_BEACON);
4057         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4058                 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4059 
4060                 beacon = rcu_dereference(ifmsh->beacon);
4061                 if (!beacon)
4062                         goto out;
4063 
4064                 if (beacon->csa_counter_offsets[0]) {
4065                         if (!is_template)
4066                                 /* TODO: For mesh csa_counter is in TU, so
4067                                  * decrementing it by one isn't correct, but
4068                                  * for now we leave it consistent with overall
4069                                  * mac80211's behavior.
4070                                  */
4071                                 __ieee80211_csa_update_counter(beacon);
4072 
4073                         ieee80211_set_csa(sdata, beacon);
4074                 }
4075 
4076                 if (ifmsh->sync_ops)
4077                         ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
4078 
4079                 skb = dev_alloc_skb(local->tx_headroom +
4080                                     beacon->head_len +
4081                                     256 + /* TIM IE */
4082                                     beacon->tail_len +
4083                                     local->hw.extra_beacon_tailroom);
4084                 if (!skb)
4085                         goto out;
4086                 skb_reserve(skb, local->tx_headroom);
4087                 memcpy(skb_put(skb, beacon->head_len), beacon->head,
4088                        beacon->head_len);
4089                 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4090 
4091                 if (offs) {
4092                         offs->tim_offset = beacon->head_len;
4093                         offs->tim_length = skb->len - beacon->head_len;
4094                 }
4095 
4096                 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
4097                        beacon->tail_len);
4098         } else {
4099                 WARN_ON(1);
4100                 goto out;
4101         }
4102 
4103         /* CSA offsets */
4104         if (offs && beacon) {
4105                 int i;
4106 
4107                 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
4108                         u16 csa_off = beacon->csa_counter_offsets[i];
4109 
4110                         if (!csa_off)
4111                                 continue;
4112 
4113                         offs->csa_counter_offs[i] = csa_off_base + csa_off;
4114                 }
4115         }
4116 
4117         band = chanctx_conf->def.chan->band;
4118 
4119         info = IEEE80211_SKB_CB(skb);
4120 
4121         info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4122         info->flags |= IEEE80211_TX_CTL_NO_ACK;
4123         info->band = band;
4124 
4125         memset(&txrc, 0, sizeof(txrc));
4126         txrc.hw = hw;
4127         txrc.sband = local->hw.wiphy->bands[band];
4128         txrc.bss_conf = &sdata->vif.bss_conf;
4129         txrc.skb = skb;
4130         txrc.reported_rate.idx = -1;
4131         txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
4132         if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
4133                 txrc.max_rate_idx = -1;
4134         else
4135                 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
4136         txrc.bss = true;
4137         rate_control_get_rate(sdata, NULL, &txrc);
4138 
4139         info->control.vif = vif;
4140 
4141         info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4142                         IEEE80211_TX_CTL_ASSIGN_SEQ |
4143                         IEEE80211_TX_CTL_FIRST_FRAGMENT;
4144  out:
4145         rcu_read_unlock();
4146         return skb;
4147 
4148 }
4149 
4150 struct sk_buff *
4151 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4152                               struct ieee80211_vif *vif,
4153                               struct ieee80211_mutable_offsets *offs)
4154 {
4155         return __ieee80211_beacon_get(hw, vif, offs, true);
4156 }
4157 EXPORT_SYMBOL(ieee80211_beacon_get_template);
4158 
4159 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4160                                          struct ieee80211_vif *vif,
4161                                          u16 *tim_offset, u16 *tim_length)
4162 {
4163         struct ieee80211_mutable_offsets offs = {};
4164         struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
4165         struct sk_buff *copy;
4166         struct ieee80211_supported_band *sband;
4167         int shift;
4168 
4169         if (!bcn)
4170                 return bcn;
4171 
4172         if (tim_offset)
4173                 *tim_offset = offs.tim_offset;
4174 
4175         if (tim_length)
4176                 *tim_length = offs.tim_length;
4177 
4178         if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4179             !hw_to_local(hw)->monitors)
4180                 return bcn;
4181 
4182         /* send a copy to monitor interfaces */
4183         copy = skb_copy(bcn, GFP_ATOMIC);
4184         if (!copy)
4185                 return bcn;
4186 
4187         shift = ieee80211_vif_get_shift(vif);
4188         sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))];
4189         ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4190 
4191         return bcn;
4192 }
4193 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4194 
4195 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4196                                         struct ieee80211_vif *vif)
4197 {
4198         struct ieee80211_if_ap *ap = NULL;
4199         struct sk_buff *skb = NULL;
4200         struct probe_resp *presp = NULL;
4201         struct ieee80211_hdr *hdr;
4202         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4203 
4204         if (sdata->vif.type != NL80211_IFTYPE_AP)
4205                 return NULL;
4206 
4207         rcu_read_lock();
4208 
4209         ap = &sdata->u.ap;
4210         presp = rcu_dereference(ap->probe_resp);
4211         if (!presp)
4212                 goto out;
4213 
4214         skb = dev_alloc_skb(presp->len);
4215         if (!skb)
4216                 goto out;
4217 
4218         memcpy(skb_put(skb, presp->len), presp->data, presp->len);
4219 
4220         hdr = (struct ieee80211_hdr *) skb->data;
4221         memset(hdr->addr1, 0, sizeof(hdr->addr1));
4222 
4223 out:
4224         rcu_read_unlock();
4225         return skb;
4226 }
4227 EXPORT_SYMBOL(ieee80211_proberesp_get);
4228 
4229 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4230                                      struct ieee80211_vif *vif)
4231 {
4232         struct ieee80211_sub_if_data *sdata;
4233         struct ieee80211_if_managed *ifmgd;
4234         struct ieee80211_pspoll *pspoll;
4235         struct ieee80211_local *local;
4236         struct sk_buff *skb;
4237 
4238         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4239                 return NULL;
4240 
4241         sdata = vif_to_sdata(vif);
4242         ifmgd = &sdata->u.mgd;
4243         local = sdata->local;
4244 
4245         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4246         if (!skb)
4247                 return NULL;
4248 
4249         skb_reserve(skb, local->hw.extra_tx_headroom);
4250 
4251         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
4252         memset(pspoll, 0, sizeof(*pspoll));
4253         pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4254                                             IEEE80211_STYPE_PSPOLL);
4255         pspoll->aid = cpu_to_le16(ifmgd->aid);
4256 
4257         /* aid in PS-Poll has its two MSBs each set to 1 */
4258         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4259 
4260         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4261         memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4262 
4263         return skb;
4264 }
4265 EXPORT_SYMBOL(ieee80211_pspoll_get);
4266 
4267 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4268                                        struct ieee80211_vif *vif)
4269 {
4270         struct ieee80211_hdr_3addr *nullfunc;
4271         struct ieee80211_sub_if_data *sdata;
4272         struct ieee80211_if_managed *ifmgd;
4273         struct ieee80211_local *local;
4274         struct sk_buff *skb;
4275 
4276         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4277                 return NULL;
4278 
4279         sdata = vif_to_sdata(vif);
4280         ifmgd = &sdata->u.mgd;
4281         local = sdata->local;
4282 
4283         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
4284         if (!skb)
4285                 return NULL;
4286 
4287         skb_reserve(skb, local->hw.extra_tx_headroom);
4288 
4289         nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
4290                                                           sizeof(*nullfunc));
4291         memset(nullfunc, 0, sizeof(*nullfunc));
4292         nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4293                                               IEEE80211_STYPE_NULLFUNC |
4294                                               IEEE80211_FCTL_TODS);
4295         memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4296         memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4297         memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4298 
4299         return skb;
4300 }
4301 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4302 
4303 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4304                                        const u8 *src_addr,
4305                                        const u8 *ssid, size_t ssid_len,
4306                                        size_t tailroom)
4307 {
4308         struct ieee80211_local *local = hw_to_local(hw);
4309         struct ieee80211_hdr_3addr *hdr;
4310         struct sk_buff *skb;
4311         size_t ie_ssid_len;
4312         u8 *pos;
4313 
4314         ie_ssid_len = 2 + ssid_len;
4315 
4316         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4317                             ie_ssid_len + tailroom);
4318         if (!skb)
4319                 return NULL;
4320 
4321         skb_reserve(skb, local->hw.extra_tx_headroom);
4322 
4323         hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
4324         memset(hdr, 0, sizeof(*hdr));
4325         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4326                                          IEEE80211_STYPE_PROBE_REQ);
4327         eth_broadcast_addr(hdr->addr1);
4328         memcpy(hdr->addr2, src_addr, ETH_ALEN);
4329         eth_broadcast_addr(hdr->addr3);
4330 
4331         pos = skb_put(skb, ie_ssid_len);
4332         *pos++ = WLAN_EID_SSID;
4333         *pos++ = ssid_len;
4334         if (ssid_len)
4335                 memcpy(pos, ssid, ssid_len);
4336         pos += ssid_len;
4337 
4338         return skb;
4339 }
4340 EXPORT_SYMBOL(ieee80211_probereq_get);
4341 
4342 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4343                        const void *frame, size_t frame_len,
4344                        const struct ieee80211_tx_info *frame_txctl,
4345                        struct ieee80211_rts *rts)
4346 {
4347         const struct ieee80211_hdr *hdr = frame;
4348 
4349         rts->frame_control =
4350             cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4351         rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4352                                                frame_txctl);
4353         memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4354         memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4355 }
4356 EXPORT_SYMBOL(ieee80211_rts_get);
4357 
4358 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4359                              const void *frame, size_t frame_len,
4360                              const struct ieee80211_tx_info *frame_txctl,
4361                              struct ieee80211_cts *cts)
4362 {
4363         const struct ieee80211_hdr *hdr = frame;
4364 
4365         cts->frame_control =
4366             cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4367         cts->duration = ieee80211_ctstoself_duration(hw, vif,
4368                                                      frame_len, frame_txctl);
4369         memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4370 }
4371 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4372 
4373 struct sk_buff *
4374 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4375                           struct ieee80211_vif *vif)
4376 {
4377         struct ieee80211_local *local = hw_to_local(hw);
4378         struct sk_buff *skb = NULL;
4379         struct ieee80211_tx_data tx;
4380         struct ieee80211_sub_if_data *sdata;
4381         struct ps_data *ps;
4382         struct ieee80211_tx_info *info;
4383         struct ieee80211_chanctx_conf *chanctx_conf;
4384 
4385         sdata = vif_to_sdata(vif);
4386 
4387         rcu_read_lock();
4388         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4389 
4390         if (!chanctx_conf)
4391                 goto out;
4392 
4393         if (sdata->vif.type == NL80211_IFTYPE_AP) {
4394                 struct beacon_data *beacon =
4395                                 rcu_dereference(sdata->u.ap.beacon);
4396 
4397                 if (!beacon || !beacon->head)
4398                         goto out;
4399 
4400                 ps = &sdata->u.ap.ps;
4401         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4402                 ps = &sdata->u.mesh.ps;
4403         } else {
4404                 goto out;
4405         }
4406 
4407         if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4408                 goto out; /* send buffered bc/mc only after DTIM beacon */
4409 
4410         while (1) {
4411                 skb = skb_dequeue(&ps->bc_buf);
4412                 if (!skb)
4413                         goto out;
4414                 local->total_ps_buffered--;
4415 
4416                 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4417                         struct ieee80211_hdr *hdr =
4418                                 (struct ieee80211_hdr *) skb->data;
4419                         /* more buffered multicast/broadcast frames ==> set
4420                          * MoreData flag in IEEE 802.11 header to inform PS
4421                          * STAs */
4422                         hdr->frame_control |=
4423                                 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4424                 }
4425 
4426                 if (sdata->vif.type == NL80211_IFTYPE_AP)
4427                         sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4428                 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4429                         break;
4430                 ieee80211_free_txskb(hw, skb);
4431         }
4432 
4433         info = IEEE80211_SKB_CB(skb);
4434 
4435         tx.flags |= IEEE80211_TX_PS_BUFFERED;
4436         info->band = chanctx_conf->def.chan->band;
4437 
4438         if (invoke_tx_handlers(&tx))
4439                 skb = NULL;
4440  out:
4441         rcu_read_unlock();
4442 
4443         return skb;
4444 }
4445 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4446 
4447 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4448 {
4449         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4450         struct ieee80211_sub_if_data *sdata = sta->sdata;
4451         struct ieee80211_local *local = sdata->local;
4452         int ret;
4453         u32 queues;
4454 
4455         lockdep_assert_held(&local->sta_mtx);
4456 
4457         /* only some cases are supported right now */
4458         switch (sdata->vif.type) {
4459         case NL80211_IFTYPE_STATION:
4460         case NL80211_IFTYPE_AP:
4461         case NL80211_IFTYPE_AP_VLAN:
4462                 break;
4463         default:
4464                 WARN_ON(1);
4465                 return -EINVAL;
4466         }
4467 
4468         if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4469                 return -EINVAL;
4470 
4471         if (sta->reserved_tid == tid) {
4472                 ret = 0;
4473                 goto out;
4474         }
4475 
4476         if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4477                 sdata_err(sdata, "TID reservation already active\n");
4478                 ret = -EALREADY;
4479                 goto out;
4480         }
4481 
4482         ieee80211_stop_vif_queues(sdata->local, sdata,
4483                                   IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4484 
4485         synchronize_net();
4486 
4487         /* Tear down BA sessions so we stop aggregating on this TID */
4488         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4489                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4490                 __ieee80211_stop_tx_ba_session(sta, tid,
4491                                                AGG_STOP_LOCAL_REQUEST);
4492         }
4493 
4494         queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4495         __ieee80211_flush_queues(local, sdata, queues, false);
4496 
4497         sta->reserved_tid = tid;
4498 
4499         ieee80211_wake_vif_queues(local, sdata,
4500                                   IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4501 
4502         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4503                 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4504 
4505         ret = 0;
4506  out:
4507         return ret;
4508 }
4509 EXPORT_SYMBOL(ieee80211_reserve_tid);
4510 
4511 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4512 {
4513         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4514         struct ieee80211_sub_if_data *sdata = sta->sdata;
4515 
4516         lockdep_assert_held(&sdata->local->sta_mtx);
4517 
4518         /* only some cases are supported right now */
4519         switch (sdata->vif.type) {
4520         case NL80211_IFTYPE_STATION:
4521         case NL80211_IFTYPE_AP:
4522         case NL80211_IFTYPE_AP_VLAN:
4523                 break;
4524         default:
4525                 WARN_ON(1);
4526                 return;
4527         }
4528 
4529         if (tid != sta->reserved_tid) {
4530                 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4531                 return;
4532         }
4533 
4534         sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4535 }
4536 EXPORT_SYMBOL(ieee80211_unreserve_tid);
4537 
4538 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4539                                  struct sk_buff *skb, int tid,
4540                                  enum nl80211_band band)
4541 {
4542         int ac = ieee802_1d_to_ac[tid & 7];
4543 
4544         skb_reset_mac_header(skb);
4545         skb_set_queue_mapping(skb, ac);
4546         skb->priority = tid;
4547 
4548         skb->dev = sdata->dev;
4549 
4550         /*
4551          * The other path calling ieee80211_xmit is from the tasklet,
4552          * and while we can handle concurrent transmissions locking
4553          * requirements are that we do not come into tx with bhs on.
4554          */
4555         local_bh_disable();
4556         IEEE80211_SKB_CB(skb)->band = band;
4557         ieee80211_xmit(sdata, NULL, skb);
4558         local_bh_enable();
4559 }
4560 

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