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Linux/net/mac80211/status.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Copyright 2002-2005, Instant802 Networks, Inc.
  4  * Copyright 2005-2006, Devicescape Software, Inc.
  5  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
  6  * Copyright 2008-2010  Johannes Berg <johannes@sipsolutions.net>
  7  * Copyright 2013-2014  Intel Mobile Communications GmbH
  8  */
  9 
 10 #include <linux/export.h>
 11 #include <linux/etherdevice.h>
 12 #include <net/mac80211.h>
 13 #include <asm/unaligned.h>
 14 #include "ieee80211_i.h"
 15 #include "rate.h"
 16 #include "mesh.h"
 17 #include "led.h"
 18 #include "wme.h"
 19 
 20 
 21 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 22                                  struct sk_buff *skb)
 23 {
 24         struct ieee80211_local *local = hw_to_local(hw);
 25         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 26         int tmp;
 27 
 28         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 29         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 30                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 31         tmp = skb_queue_len(&local->skb_queue) +
 32                 skb_queue_len(&local->skb_queue_unreliable);
 33         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 34                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 35                 ieee80211_free_txskb(hw, skb);
 36                 tmp--;
 37                 I802_DEBUG_INC(local->tx_status_drop);
 38         }
 39         tasklet_schedule(&local->tasklet);
 40 }
 41 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 42 
 43 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 44                                             struct sta_info *sta,
 45                                             struct sk_buff *skb)
 46 {
 47         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 48         struct ieee80211_hdr *hdr = (void *)skb->data;
 49         int ac;
 50 
 51         if (info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER |
 52                            IEEE80211_TX_CTL_AMPDU)) {
 53                 ieee80211_free_txskb(&local->hw, skb);
 54                 return;
 55         }
 56 
 57         /*
 58          * This skb 'survived' a round-trip through the driver, and
 59          * hopefully the driver didn't mangle it too badly. However,
 60          * we can definitely not rely on the control information
 61          * being correct. Clear it so we don't get junk there, and
 62          * indicate that it needs new processing, but must not be
 63          * modified/encrypted again.
 64          */
 65         memset(&info->control, 0, sizeof(info->control));
 66 
 67         info->control.jiffies = jiffies;
 68         info->control.vif = &sta->sdata->vif;
 69         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
 70                        IEEE80211_TX_INTFL_RETRANSMISSION;
 71         info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
 72 
 73         sta->status_stats.filtered++;
 74 
 75         /*
 76          * Clear more-data bit on filtered frames, it might be set
 77          * but later frames might time out so it might have to be
 78          * clear again ... It's all rather unlikely (this frame
 79          * should time out first, right?) but let's not confuse
 80          * peers unnecessarily.
 81          */
 82         if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
 83                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
 84 
 85         if (ieee80211_is_data_qos(hdr->frame_control)) {
 86                 u8 *p = ieee80211_get_qos_ctl(hdr);
 87                 int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
 88 
 89                 /*
 90                  * Clear EOSP if set, this could happen e.g.
 91                  * if an absence period (us being a P2P GO)
 92                  * shortens the SP.
 93                  */
 94                 if (*p & IEEE80211_QOS_CTL_EOSP)
 95                         *p &= ~IEEE80211_QOS_CTL_EOSP;
 96                 ac = ieee80211_ac_from_tid(tid);
 97         } else {
 98                 ac = IEEE80211_AC_BE;
 99         }
100 
101         /*
102          * Clear the TX filter mask for this STA when sending the next
103          * packet. If the STA went to power save mode, this will happen
104          * when it wakes up for the next time.
105          */
106         set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
107         ieee80211_clear_fast_xmit(sta);
108 
109         /*
110          * This code races in the following way:
111          *
112          *  (1) STA sends frame indicating it will go to sleep and does so
113          *  (2) hardware/firmware adds STA to filter list, passes frame up
114          *  (3) hardware/firmware processes TX fifo and suppresses a frame
115          *  (4) we get TX status before having processed the frame and
116          *      knowing that the STA has gone to sleep.
117          *
118          * This is actually quite unlikely even when both those events are
119          * processed from interrupts coming in quickly after one another or
120          * even at the same time because we queue both TX status events and
121          * RX frames to be processed by a tasklet and process them in the
122          * same order that they were received or TX status last. Hence, there
123          * is no race as long as the frame RX is processed before the next TX
124          * status, which drivers can ensure, see below.
125          *
126          * Note that this can only happen if the hardware or firmware can
127          * actually add STAs to the filter list, if this is done by the
128          * driver in response to set_tim() (which will only reduce the race
129          * this whole filtering tries to solve, not completely solve it)
130          * this situation cannot happen.
131          *
132          * To completely solve this race drivers need to make sure that they
133          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
134          *      functions and
135          *  (b) always process RX events before TX status events if ordering
136          *      can be unknown, for example with different interrupt status
137          *      bits.
138          *  (c) if PS mode transitions are manual (i.e. the flag
139          *      %IEEE80211_HW_AP_LINK_PS is set), always process PS state
140          *      changes before calling TX status events if ordering can be
141          *      unknown.
142          */
143         if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
144             skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
145                 skb_queue_tail(&sta->tx_filtered[ac], skb);
146                 sta_info_recalc_tim(sta);
147 
148                 if (!timer_pending(&local->sta_cleanup))
149                         mod_timer(&local->sta_cleanup,
150                                   round_jiffies(jiffies +
151                                                 STA_INFO_CLEANUP_INTERVAL));
152                 return;
153         }
154 
155         if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
156             !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
157                 /* Software retry the packet once */
158                 info->flags |= IEEE80211_TX_INTFL_RETRIED;
159                 ieee80211_add_pending_skb(local, skb);
160                 return;
161         }
162 
163         ps_dbg_ratelimited(sta->sdata,
164                            "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
165                            skb_queue_len(&sta->tx_filtered[ac]),
166                            !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
167         ieee80211_free_txskb(&local->hw, skb);
168 }
169 
170 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
171 {
172         struct tid_ampdu_tx *tid_tx;
173 
174         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
175         if (!tid_tx || !tid_tx->bar_pending)
176                 return;
177 
178         tid_tx->bar_pending = false;
179         ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
180 }
181 
182 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
183 {
184         struct ieee80211_mgmt *mgmt = (void *) skb->data;
185         struct ieee80211_local *local = sta->local;
186         struct ieee80211_sub_if_data *sdata = sta->sdata;
187         struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
188 
189         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
190                 sta->status_stats.last_ack = jiffies;
191                 if (txinfo->status.is_valid_ack_signal) {
192                         sta->status_stats.last_ack_signal =
193                                          (s8)txinfo->status.ack_signal;
194                         sta->status_stats.ack_signal_filled = true;
195                         ewma_avg_signal_add(&sta->status_stats.avg_ack_signal,
196                                             -txinfo->status.ack_signal);
197                 }
198         }
199 
200         if (ieee80211_is_data_qos(mgmt->frame_control)) {
201                 struct ieee80211_hdr *hdr = (void *) skb->data;
202                 u8 *qc = ieee80211_get_qos_ctl(hdr);
203                 u16 tid = qc[0] & 0xf;
204 
205                 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
206         }
207 
208         if (ieee80211_is_action(mgmt->frame_control) &&
209             !ieee80211_has_protected(mgmt->frame_control) &&
210             mgmt->u.action.category == WLAN_CATEGORY_HT &&
211             mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
212             ieee80211_sdata_running(sdata)) {
213                 enum ieee80211_smps_mode smps_mode;
214 
215                 switch (mgmt->u.action.u.ht_smps.smps_control) {
216                 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
217                         smps_mode = IEEE80211_SMPS_DYNAMIC;
218                         break;
219                 case WLAN_HT_SMPS_CONTROL_STATIC:
220                         smps_mode = IEEE80211_SMPS_STATIC;
221                         break;
222                 case WLAN_HT_SMPS_CONTROL_DISABLED:
223                 default: /* shouldn't happen since we don't send that */
224                         smps_mode = IEEE80211_SMPS_OFF;
225                         break;
226                 }
227 
228                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
229                         /*
230                          * This update looks racy, but isn't -- if we come
231                          * here we've definitely got a station that we're
232                          * talking to, and on a managed interface that can
233                          * only be the AP. And the only other place updating
234                          * this variable in managed mode is before association.
235                          */
236                         sdata->smps_mode = smps_mode;
237                         ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
238                 } else if (sdata->vif.type == NL80211_IFTYPE_AP ||
239                            sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
240                         sta->known_smps_mode = smps_mode;
241                 }
242         }
243 }
244 
245 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
246 {
247         struct tid_ampdu_tx *tid_tx;
248 
249         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
250         if (!tid_tx)
251                 return;
252 
253         tid_tx->failed_bar_ssn = ssn;
254         tid_tx->bar_pending = true;
255 }
256 
257 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info,
258                                      struct ieee80211_tx_status *status)
259 {
260         int len = sizeof(struct ieee80211_radiotap_header);
261 
262         /* IEEE80211_RADIOTAP_RATE rate */
263         if (status && status->rate && !(status->rate->flags &
264                                         (RATE_INFO_FLAGS_MCS |
265                                          RATE_INFO_FLAGS_DMG |
266                                          RATE_INFO_FLAGS_EDMG |
267                                          RATE_INFO_FLAGS_VHT_MCS |
268                                          RATE_INFO_FLAGS_HE_MCS)))
269                 len += 2;
270         else if (info->status.rates[0].idx >= 0 &&
271                  !(info->status.rates[0].flags &
272                    (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)))
273                 len += 2;
274 
275         /* IEEE80211_RADIOTAP_TX_FLAGS */
276         len += 2;
277 
278         /* IEEE80211_RADIOTAP_DATA_RETRIES */
279         len += 1;
280 
281         /* IEEE80211_RADIOTAP_MCS
282          * IEEE80211_RADIOTAP_VHT */
283         if (status && status->rate) {
284                 if (status->rate->flags & RATE_INFO_FLAGS_MCS)
285                         len += 3;
286                 else if (status->rate->flags & RATE_INFO_FLAGS_VHT_MCS)
287                         len = ALIGN(len, 2) + 12;
288                 else if (status->rate->flags & RATE_INFO_FLAGS_HE_MCS)
289                         len = ALIGN(len, 2) + 12;
290         } else if (info->status.rates[0].idx >= 0) {
291                 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
292                         len += 3;
293                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
294                         len = ALIGN(len, 2) + 12;
295         }
296 
297         return len;
298 }
299 
300 static void
301 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
302                                  struct ieee80211_supported_band *sband,
303                                  struct sk_buff *skb, int retry_count,
304                                  int rtap_len, int shift,
305                                  struct ieee80211_tx_status *status)
306 {
307         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
308         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
309         struct ieee80211_radiotap_header *rthdr;
310         unsigned char *pos;
311         u16 legacy_rate = 0;
312         u16 txflags;
313 
314         rthdr = skb_push(skb, rtap_len);
315 
316         memset(rthdr, 0, rtap_len);
317         rthdr->it_len = cpu_to_le16(rtap_len);
318         rthdr->it_present =
319                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
320                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
321         pos = (unsigned char *)(rthdr + 1);
322 
323         /*
324          * XXX: Once radiotap gets the bitmap reset thing the vendor
325          *      extensions proposal contains, we can actually report
326          *      the whole set of tries we did.
327          */
328 
329         /* IEEE80211_RADIOTAP_RATE */
330 
331         if (status && status->rate) {
332                 if (!(status->rate->flags & (RATE_INFO_FLAGS_MCS |
333                                              RATE_INFO_FLAGS_DMG |
334                                              RATE_INFO_FLAGS_EDMG |
335                                              RATE_INFO_FLAGS_VHT_MCS |
336                                              RATE_INFO_FLAGS_HE_MCS)))
337                         legacy_rate = status->rate->legacy;
338         } else if (info->status.rates[0].idx >= 0 &&
339                  !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
340                                                   IEEE80211_TX_RC_VHT_MCS)))
341                 legacy_rate =
342                         sband->bitrates[info->status.rates[0].idx].bitrate;
343 
344         if (legacy_rate) {
345                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
346                 *pos = DIV_ROUND_UP(legacy_rate, 5 * (1 << shift));
347                 /* padding for tx flags */
348                 pos += 2;
349         }
350 
351         /* IEEE80211_RADIOTAP_TX_FLAGS */
352         txflags = 0;
353         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
354             !is_multicast_ether_addr(hdr->addr1))
355                 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
356 
357         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
358                 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
359         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
360                 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
361 
362         put_unaligned_le16(txflags, pos);
363         pos += 2;
364 
365         /* IEEE80211_RADIOTAP_DATA_RETRIES */
366         /* for now report the total retry_count */
367         *pos = retry_count;
368         pos++;
369 
370         if (status && status->rate &&
371             (status->rate->flags & RATE_INFO_FLAGS_MCS)) {
372                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
373                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
374                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
375                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
376                 if (status->rate->flags & RATE_INFO_FLAGS_SHORT_GI)
377                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
378                 if (status->rate->bw == RATE_INFO_BW_40)
379                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
380                 pos[2] = status->rate->mcs;
381                 pos += 3;
382         } else if (status && status->rate &&
383                    (status->rate->flags & RATE_INFO_FLAGS_VHT_MCS)) {
384                 u16 known = local->hw.radiotap_vht_details &
385                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
386                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
387 
388                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
389 
390                 /* required alignment from rthdr */
391                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
392 
393                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
394                 put_unaligned_le16(known, pos);
395                 pos += 2;
396 
397                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
398                 if (status->rate->flags & RATE_INFO_FLAGS_SHORT_GI)
399                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
400                 pos++;
401 
402                 /* u8 bandwidth */
403                 switch (status->rate->bw) {
404                 case RATE_INFO_BW_160:
405                         *pos = 11;
406                         break;
407                 case RATE_INFO_BW_80:
408                         *pos = 4;
409                         break;
410                 case RATE_INFO_BW_40:
411                         *pos = 1;
412                         break;
413                 default:
414                         *pos = 0;
415                         break;
416                 }
417                 pos++;
418 
419                 /* u8 mcs_nss[4] */
420                 *pos = (status->rate->mcs << 4) | status->rate->nss;
421                 pos += 4;
422 
423                 /* u8 coding */
424                 pos++;
425                 /* u8 group_id */
426                 pos++;
427                 /* u16 partial_aid */
428                 pos += 2;
429         } else if (status && status->rate &&
430                    (status->rate->flags & RATE_INFO_FLAGS_HE_MCS)) {
431                 struct ieee80211_radiotap_he *he;
432 
433                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
434 
435                 /* required alignment from rthdr */
436                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
437                 he = (struct ieee80211_radiotap_he *)pos;
438 
439                 he->data1 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA1_FORMAT_SU |
440                                         IEEE80211_RADIOTAP_HE_DATA1_DATA_MCS_KNOWN |
441                                         IEEE80211_RADIOTAP_HE_DATA1_DATA_DCM_KNOWN |
442                                         IEEE80211_RADIOTAP_HE_DATA1_BW_RU_ALLOC_KNOWN);
443 
444                 he->data2 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA2_GI_KNOWN);
445 
446 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
447 
448                 he->data6 |= HE_PREP(DATA6_NSTS, status->rate->nss);
449 
450 #define CHECK_GI(s) \
451         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
452         (int)NL80211_RATE_INFO_HE_GI_##s)
453 
454                 CHECK_GI(0_8);
455                 CHECK_GI(1_6);
456                 CHECK_GI(3_2);
457 
458                 he->data3 |= HE_PREP(DATA3_DATA_MCS, status->rate->mcs);
459                 he->data3 |= HE_PREP(DATA3_DATA_DCM, status->rate->he_dcm);
460 
461                 he->data5 |= HE_PREP(DATA5_GI, status->rate->he_gi);
462 
463                 switch (status->rate->bw) {
464                 case RATE_INFO_BW_20:
465                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
466                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
467                         break;
468                 case RATE_INFO_BW_40:
469                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
470                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
471                         break;
472                 case RATE_INFO_BW_80:
473                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
474                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
475                         break;
476                 case RATE_INFO_BW_160:
477                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
478                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
479                         break;
480                 case RATE_INFO_BW_HE_RU:
481 #define CHECK_RU_ALLOC(s) \
482         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
483         NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
484 
485                         CHECK_RU_ALLOC(26);
486                         CHECK_RU_ALLOC(52);
487                         CHECK_RU_ALLOC(106);
488                         CHECK_RU_ALLOC(242);
489                         CHECK_RU_ALLOC(484);
490                         CHECK_RU_ALLOC(996);
491                         CHECK_RU_ALLOC(2x996);
492 
493                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
494                                              status->rate->he_ru_alloc + 4);
495                         break;
496                 default:
497                         WARN_ONCE(1, "Invalid SU BW %d\n", status->rate->bw);
498                 }
499 
500                 pos += sizeof(struct ieee80211_radiotap_he);
501         }
502 
503         if ((status && status->rate) || info->status.rates[0].idx < 0)
504                 return;
505 
506         /* IEEE80211_RADIOTAP_MCS
507          * IEEE80211_RADIOTAP_VHT */
508         if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
509                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
510                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
511                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
512                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
513                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
514                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
515                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
516                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
517                 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
518                         pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
519                 pos[2] = info->status.rates[0].idx;
520                 pos += 3;
521         } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
522                 u16 known = local->hw.radiotap_vht_details &
523                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
524                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
525 
526                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
527 
528                 /* required alignment from rthdr */
529                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
530 
531                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
532                 put_unaligned_le16(known, pos);
533                 pos += 2;
534 
535                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
536                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
537                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
538                 pos++;
539 
540                 /* u8 bandwidth */
541                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
542                         *pos = 1;
543                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
544                         *pos = 4;
545                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
546                         *pos = 11;
547                 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
548                         *pos = 0;
549                 pos++;
550 
551                 /* u8 mcs_nss[4] */
552                 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
553                         ieee80211_rate_get_vht_nss(&info->status.rates[0]);
554                 pos += 4;
555 
556                 /* u8 coding */
557                 pos++;
558                 /* u8 group_id */
559                 pos++;
560                 /* u16 partial_aid */
561                 pos += 2;
562         }
563 }
564 
565 /*
566  * Handles the tx for TDLS teardown frames.
567  * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
568  */
569 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
570                                         struct ieee80211_sub_if_data *sdata,
571                                         struct sk_buff *skb, u32 flags)
572 {
573         struct sk_buff *teardown_skb;
574         struct sk_buff *orig_teardown_skb;
575         bool is_teardown = false;
576 
577         /* Get the teardown data we need and free the lock */
578         spin_lock(&sdata->u.mgd.teardown_lock);
579         teardown_skb = sdata->u.mgd.teardown_skb;
580         orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
581         if ((skb == orig_teardown_skb) && teardown_skb) {
582                 sdata->u.mgd.teardown_skb = NULL;
583                 sdata->u.mgd.orig_teardown_skb = NULL;
584                 is_teardown = true;
585         }
586         spin_unlock(&sdata->u.mgd.teardown_lock);
587 
588         if (is_teardown) {
589                 /* This mechanism relies on being able to get ACKs */
590                 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
591 
592                 /* Check if peer has ACKed */
593                 if (flags & IEEE80211_TX_STAT_ACK) {
594                         dev_kfree_skb_any(teardown_skb);
595                 } else {
596                         tdls_dbg(sdata,
597                                  "TDLS Resending teardown through AP\n");
598 
599                         ieee80211_subif_start_xmit(teardown_skb, skb->dev);
600                 }
601         }
602 }
603 
604 static struct ieee80211_sub_if_data *
605 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
606 {
607         struct ieee80211_sub_if_data *sdata;
608 
609         if (skb->dev) {
610                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
611                         if (!sdata->dev)
612                                 continue;
613 
614                         if (skb->dev == sdata->dev)
615                                 return sdata;
616                 }
617 
618                 return NULL;
619         }
620 
621         return rcu_dereference(local->p2p_sdata);
622 }
623 
624 static void ieee80211_report_ack_skb(struct ieee80211_local *local,
625                                      struct ieee80211_tx_info *info,
626                                      bool acked, bool dropped)
627 {
628         struct sk_buff *skb;
629         unsigned long flags;
630 
631         spin_lock_irqsave(&local->ack_status_lock, flags);
632         skb = idr_remove(&local->ack_status_frames, info->ack_frame_id);
633         spin_unlock_irqrestore(&local->ack_status_lock, flags);
634 
635         if (!skb)
636                 return;
637 
638         if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
639                 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
640                 struct ieee80211_sub_if_data *sdata;
641                 struct ieee80211_hdr *hdr = (void *)skb->data;
642                 __be16 ethertype = 0;
643 
644                 if (skb->len >= ETH_HLEN && skb->protocol == cpu_to_be16(ETH_P_802_3))
645                         skb_copy_bits(skb, 2 * ETH_ALEN, &ethertype, ETH_TLEN);
646 
647                 rcu_read_lock();
648                 sdata = ieee80211_sdata_from_skb(local, skb);
649                 if (sdata) {
650                         if (ethertype == sdata->control_port_protocol ||
651                             ethertype == cpu_to_be16(ETH_P_PREAUTH))
652                                 cfg80211_control_port_tx_status(&sdata->wdev,
653                                                                 cookie,
654                                                                 skb->data,
655                                                                 skb->len,
656                                                                 acked,
657                                                                 GFP_ATOMIC);
658                         else if (ieee80211_is_any_nullfunc(hdr->frame_control))
659                                 cfg80211_probe_status(sdata->dev, hdr->addr1,
660                                                       cookie, acked,
661                                                       info->status.ack_signal,
662                                                       info->status.is_valid_ack_signal,
663                                                       GFP_ATOMIC);
664                         else if (ieee80211_is_mgmt(hdr->frame_control))
665                                 cfg80211_mgmt_tx_status(&sdata->wdev, cookie,
666                                                         skb->data, skb->len,
667                                                         acked, GFP_ATOMIC);
668                         else
669                                 pr_warn("Unknown status report in ack skb\n");
670 
671                 }
672                 rcu_read_unlock();
673 
674                 dev_kfree_skb_any(skb);
675         } else if (dropped) {
676                 dev_kfree_skb_any(skb);
677         } else {
678                 /* consumes skb */
679                 skb_complete_wifi_ack(skb, acked);
680         }
681 }
682 
683 static void ieee80211_report_used_skb(struct ieee80211_local *local,
684                                       struct sk_buff *skb, bool dropped)
685 {
686         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
687         u16 tx_time_est = ieee80211_info_get_tx_time_est(info);
688         struct ieee80211_hdr *hdr = (void *)skb->data;
689         bool acked = info->flags & IEEE80211_TX_STAT_ACK;
690 
691         if (dropped)
692                 acked = false;
693 
694         if (tx_time_est) {
695                 struct sta_info *sta;
696 
697                 rcu_read_lock();
698 
699                 sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
700                 ieee80211_sta_update_pending_airtime(local, sta,
701                                                      skb_get_queue_mapping(skb),
702                                                      tx_time_est,
703                                                      true);
704                 rcu_read_unlock();
705         }
706 
707         if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
708                 struct ieee80211_sub_if_data *sdata;
709 
710                 rcu_read_lock();
711 
712                 sdata = ieee80211_sdata_from_skb(local, skb);
713 
714                 if (!sdata) {
715                         skb->dev = NULL;
716                 } else {
717                         unsigned int hdr_size =
718                                 ieee80211_hdrlen(hdr->frame_control);
719 
720                         /* Check to see if packet is a TDLS teardown packet */
721                         if (ieee80211_is_data(hdr->frame_control) &&
722                             (ieee80211_get_tdls_action(skb, hdr_size) ==
723                              WLAN_TDLS_TEARDOWN))
724                                 ieee80211_tdls_td_tx_handle(local, sdata, skb,
725                                                             info->flags);
726                         else
727                                 ieee80211_mgd_conn_tx_status(sdata,
728                                                              hdr->frame_control,
729                                                              acked);
730                 }
731 
732                 rcu_read_unlock();
733         } else if (info->ack_frame_id) {
734                 ieee80211_report_ack_skb(local, info, acked, dropped);
735         }
736 
737         if (!dropped && skb->destructor) {
738                 skb->wifi_acked_valid = 1;
739                 skb->wifi_acked = acked;
740         }
741 
742         ieee80211_led_tx(local);
743 
744         if (skb_has_frag_list(skb)) {
745                 kfree_skb_list(skb_shinfo(skb)->frag_list);
746                 skb_shinfo(skb)->frag_list = NULL;
747         }
748 }
749 
750 /*
751  * Use a static threshold for now, best value to be determined
752  * by testing ...
753  * Should it depend on:
754  *  - on # of retransmissions
755  *  - current throughput (higher value for higher tpt)?
756  */
757 #define STA_LOST_PKT_THRESHOLD  50
758 #define STA_LOST_PKT_TIME       HZ              /* 1 sec since last ACK */
759 #define STA_LOST_TDLS_PKT_THRESHOLD     10
760 #define STA_LOST_TDLS_PKT_TIME          (10*HZ) /* 10secs since last ACK */
761 
762 static void ieee80211_lost_packet(struct sta_info *sta,
763                                   struct ieee80211_tx_info *info)
764 {
765         unsigned long pkt_time = STA_LOST_PKT_TIME;
766         unsigned int pkt_thr = STA_LOST_PKT_THRESHOLD;
767 
768         /* If driver relies on its own algorithm for station kickout, skip
769          * mac80211 packet loss mechanism.
770          */
771         if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
772                 return;
773 
774         /* This packet was aggregated but doesn't carry status info */
775         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
776             !(info->flags & IEEE80211_TX_STAT_AMPDU))
777                 return;
778 
779         sta->status_stats.lost_packets++;
780         if (sta->sta.tdls) {
781                 pkt_time = STA_LOST_TDLS_PKT_TIME;
782                 pkt_thr = STA_LOST_PKT_THRESHOLD;
783         }
784 
785         /*
786          * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD
787          * of the last packets were lost, and that no ACK was received in the
788          * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
789          * mechanism.
790          * For non-TDLS, use STA_LOST_PKT_THRESHOLD and STA_LOST_PKT_TIME
791          */
792         if (sta->status_stats.lost_packets < pkt_thr ||
793             !time_after(jiffies, sta->status_stats.last_pkt_time + pkt_time))
794                 return;
795 
796         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
797                                     sta->status_stats.lost_packets, GFP_ATOMIC);
798         sta->status_stats.lost_packets = 0;
799 }
800 
801 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
802                                   struct ieee80211_tx_info *info,
803                                   int *retry_count)
804 {
805         int count = -1;
806         int i;
807 
808         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
809                 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
810                     !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
811                         /* just the first aggr frame carry status info */
812                         info->status.rates[i].idx = -1;
813                         info->status.rates[i].count = 0;
814                         break;
815                 } else if (info->status.rates[i].idx < 0) {
816                         break;
817                 } else if (i >= hw->max_report_rates) {
818                         /* the HW cannot have attempted that rate */
819                         info->status.rates[i].idx = -1;
820                         info->status.rates[i].count = 0;
821                         break;
822                 }
823 
824                 count += info->status.rates[i].count;
825         }
826 
827         if (count < 0)
828                 count = 0;
829 
830         *retry_count = count;
831         return i - 1;
832 }
833 
834 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
835                           struct ieee80211_supported_band *sband,
836                           int retry_count, int shift, bool send_to_cooked,
837                           struct ieee80211_tx_status *status)
838 {
839         struct sk_buff *skb2;
840         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
841         struct ieee80211_sub_if_data *sdata;
842         struct net_device *prev_dev = NULL;
843         int rtap_len;
844 
845         /* send frame to monitor interfaces now */
846         rtap_len = ieee80211_tx_radiotap_len(info, status);
847         if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
848                 pr_err("ieee80211_tx_status: headroom too small\n");
849                 dev_kfree_skb(skb);
850                 return;
851         }
852         ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
853                                          rtap_len, shift, status);
854 
855         /* XXX: is this sufficient for BPF? */
856         skb_reset_mac_header(skb);
857         skb->ip_summed = CHECKSUM_UNNECESSARY;
858         skb->pkt_type = PACKET_OTHERHOST;
859         skb->protocol = htons(ETH_P_802_2);
860         memset(skb->cb, 0, sizeof(skb->cb));
861 
862         rcu_read_lock();
863         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
864                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
865                         if (!ieee80211_sdata_running(sdata))
866                                 continue;
867 
868                         if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
869                             !send_to_cooked)
870                                 continue;
871 
872                         if (prev_dev) {
873                                 skb2 = skb_clone(skb, GFP_ATOMIC);
874                                 if (skb2) {
875                                         skb2->dev = prev_dev;
876                                         netif_rx(skb2);
877                                 }
878                         }
879 
880                         prev_dev = sdata->dev;
881                 }
882         }
883         if (prev_dev) {
884                 skb->dev = prev_dev;
885                 netif_rx(skb);
886                 skb = NULL;
887         }
888         rcu_read_unlock();
889         dev_kfree_skb(skb);
890 }
891 
892 static void __ieee80211_tx_status(struct ieee80211_hw *hw,
893                                   struct ieee80211_tx_status *status)
894 {
895         struct sk_buff *skb = status->skb;
896         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
897         struct ieee80211_local *local = hw_to_local(hw);
898         struct ieee80211_tx_info *info = status->info;
899         struct sta_info *sta;
900         __le16 fc;
901         struct ieee80211_supported_band *sband;
902         int retry_count;
903         int rates_idx;
904         bool send_to_cooked;
905         bool acked;
906         bool noack_success;
907         struct ieee80211_bar *bar;
908         int shift = 0;
909         int tid = IEEE80211_NUM_TIDS;
910         u16 tx_time_est;
911 
912         rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
913 
914         sband = local->hw.wiphy->bands[info->band];
915         fc = hdr->frame_control;
916 
917         if (status->sta) {
918                 sta = container_of(status->sta, struct sta_info, sta);
919                 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
920 
921                 if (info->flags & IEEE80211_TX_STATUS_EOSP)
922                         clear_sta_flag(sta, WLAN_STA_SP);
923 
924                 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
925                 noack_success = !!(info->flags &
926                                    IEEE80211_TX_STAT_NOACK_TRANSMITTED);
927 
928                 /* mesh Peer Service Period support */
929                 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
930                     ieee80211_is_data_qos(fc))
931                         ieee80211_mpsp_trigger_process(
932                                 ieee80211_get_qos_ctl(hdr), sta, true, acked);
933 
934                 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
935                         /*
936                          * The STA is in power save mode, so assume
937                          * that this TX packet failed because of that.
938                          */
939                         ieee80211_handle_filtered_frame(local, sta, skb);
940                         return;
941                 }
942 
943                 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
944                     (ieee80211_is_data(hdr->frame_control)) &&
945                     (rates_idx != -1))
946                         sta->tx_stats.last_rate =
947                                 info->status.rates[rates_idx];
948 
949                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
950                     (ieee80211_is_data_qos(fc))) {
951                         u16 ssn;
952                         u8 *qc;
953 
954                         qc = ieee80211_get_qos_ctl(hdr);
955                         tid = qc[0] & 0xf;
956                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
957                                                 & IEEE80211_SCTL_SEQ);
958                         ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
959                                            tid, ssn);
960                 } else if (ieee80211_is_data_qos(fc)) {
961                         u8 *qc = ieee80211_get_qos_ctl(hdr);
962 
963                         tid = qc[0] & 0xf;
964                 }
965 
966                 if (!acked && ieee80211_is_back_req(fc)) {
967                         u16 control;
968 
969                         /*
970                          * BAR failed, store the last SSN and retry sending
971                          * the BAR when the next unicast transmission on the
972                          * same TID succeeds.
973                          */
974                         bar = (struct ieee80211_bar *) skb->data;
975                         control = le16_to_cpu(bar->control);
976                         if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
977                                 u16 ssn = le16_to_cpu(bar->start_seq_num);
978 
979                                 tid = (control &
980                                        IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
981                                       IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
982 
983                                 ieee80211_set_bar_pending(sta, tid, ssn);
984                         }
985                 }
986 
987                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
988                         ieee80211_handle_filtered_frame(local, sta, skb);
989                         return;
990                 } else {
991                         if (!acked && !noack_success)
992                                 sta->status_stats.retry_failed++;
993                         sta->status_stats.retry_count += retry_count;
994 
995                         if (ieee80211_is_data_present(fc)) {
996                                 if (!acked && !noack_success)
997                                         sta->status_stats.msdu_failed[tid]++;
998 
999                                 sta->status_stats.msdu_retries[tid] +=
1000                                         retry_count;
1001                         }
1002                 }
1003 
1004                 rate_control_tx_status(local, sband, status);
1005                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
1006                         ieee80211s_update_metric(local, sta, status);
1007 
1008                 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
1009                         ieee80211_frame_acked(sta, skb);
1010 
1011                 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
1012                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1013                         ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data,
1014                                                 acked, info->status.tx_time);
1015 
1016                 if (info->status.tx_time &&
1017                     wiphy_ext_feature_isset(local->hw.wiphy,
1018                                             NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
1019                         ieee80211_sta_register_airtime(&sta->sta, tid,
1020                                                        info->status.tx_time, 0);
1021 
1022                 if ((tx_time_est = ieee80211_info_get_tx_time_est(info)) > 0) {
1023                         /* Do this here to avoid the expensive lookup of the sta
1024                          * in ieee80211_report_used_skb().
1025                          */
1026                         ieee80211_sta_update_pending_airtime(local, sta,
1027                                                              skb_get_queue_mapping(skb),
1028                                                              tx_time_est,
1029                                                              true);
1030                         ieee80211_info_set_tx_time_est(info, 0);
1031                 }
1032 
1033                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
1034                         if (acked) {
1035                                 if (sta->status_stats.lost_packets)
1036                                         sta->status_stats.lost_packets = 0;
1037 
1038                                 /* Track when last TDLS packet was ACKed */
1039                                 sta->status_stats.last_pkt_time = jiffies;
1040                         } else if (noack_success) {
1041                                 /* nothing to do here, do not account as lost */
1042                         } else {
1043                                 ieee80211_lost_packet(sta, info);
1044                         }
1045                 }
1046         }
1047 
1048         /* SNMP counters
1049          * Fragments are passed to low-level drivers as separate skbs, so these
1050          * are actually fragments, not frames. Update frame counters only for
1051          * the first fragment of the frame. */
1052         if ((info->flags & IEEE80211_TX_STAT_ACK) ||
1053             (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
1054                 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
1055                         I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1056                         if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
1057                                 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1058                         if (retry_count > 0)
1059                                 I802_DEBUG_INC(local->dot11RetryCount);
1060                         if (retry_count > 1)
1061                                 I802_DEBUG_INC(local->dot11MultipleRetryCount);
1062                 }
1063 
1064                 /* This counter shall be incremented for an acknowledged MPDU
1065                  * with an individual address in the address 1 field or an MPDU
1066                  * with a multicast address in the address 1 field of type Data
1067                  * or Management. */
1068                 if (!is_multicast_ether_addr(hdr->addr1) ||
1069                     ieee80211_is_data(fc) ||
1070                     ieee80211_is_mgmt(fc))
1071                         I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
1072         } else {
1073                 if (ieee80211_is_first_frag(hdr->seq_ctrl))
1074                         I802_DEBUG_INC(local->dot11FailedCount);
1075         }
1076 
1077         if (ieee80211_is_any_nullfunc(fc) &&
1078             ieee80211_has_pm(fc) &&
1079             ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1080             !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
1081             local->ps_sdata && !(local->scanning)) {
1082                 if (info->flags & IEEE80211_TX_STAT_ACK) {
1083                         local->ps_sdata->u.mgd.flags |=
1084                                         IEEE80211_STA_NULLFUNC_ACKED;
1085                 } else
1086                         mod_timer(&local->dynamic_ps_timer, jiffies +
1087                                         msecs_to_jiffies(10));
1088         }
1089 
1090         ieee80211_report_used_skb(local, skb, false);
1091 
1092         /* this was a transmitted frame, but now we want to reuse it */
1093         skb_orphan(skb);
1094 
1095         /* Need to make a copy before skb->cb gets cleared */
1096         send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
1097                          !(ieee80211_is_data(fc));
1098 
1099         /*
1100          * This is a bit racy but we can avoid a lot of work
1101          * with this test...
1102          */
1103         if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
1104                 dev_kfree_skb(skb);
1105                 return;
1106         }
1107 
1108         /* send to monitor interfaces */
1109         ieee80211_tx_monitor(local, skb, sband, retry_count, shift,
1110                              send_to_cooked, status);
1111 }
1112 
1113 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1114 {
1115         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1116         struct ieee80211_local *local = hw_to_local(hw);
1117         struct ieee80211_tx_status status = {
1118                 .skb = skb,
1119                 .info = IEEE80211_SKB_CB(skb),
1120         };
1121         struct sta_info *sta;
1122 
1123         rcu_read_lock();
1124 
1125         sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
1126         if (sta)
1127                 status.sta = &sta->sta;
1128 
1129         __ieee80211_tx_status(hw, &status);
1130         rcu_read_unlock();
1131 }
1132 EXPORT_SYMBOL(ieee80211_tx_status);
1133 
1134 void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
1135                              struct ieee80211_tx_status *status)
1136 {
1137         struct ieee80211_local *local = hw_to_local(hw);
1138         struct ieee80211_tx_info *info = status->info;
1139         struct ieee80211_sta *pubsta = status->sta;
1140         struct ieee80211_supported_band *sband;
1141         struct sta_info *sta;
1142         int retry_count;
1143         bool acked, noack_success;
1144 
1145         if (pubsta) {
1146                 sta = container_of(pubsta, struct sta_info, sta);
1147 
1148                 if (status->rate)
1149                         sta->tx_stats.last_rate_info = *status->rate;
1150         }
1151 
1152         if (status->skb)
1153                 return __ieee80211_tx_status(hw, status);
1154 
1155         if (!status->sta)
1156                 return;
1157 
1158         ieee80211_tx_get_rates(hw, info, &retry_count);
1159 
1160         sband = hw->wiphy->bands[info->band];
1161 
1162         acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
1163         noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
1164 
1165         if (pubsta) {
1166                 if (!acked && !noack_success)
1167                         sta->status_stats.retry_failed++;
1168                 sta->status_stats.retry_count += retry_count;
1169 
1170                 if (acked) {
1171                         sta->status_stats.last_ack = jiffies;
1172 
1173                         if (sta->status_stats.lost_packets)
1174                                 sta->status_stats.lost_packets = 0;
1175 
1176                         /* Track when last packet was ACKed */
1177                         sta->status_stats.last_pkt_time = jiffies;
1178                 } else if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1179                         return;
1180                 } else if (noack_success) {
1181                         /* nothing to do here, do not account as lost */
1182                 } else {
1183                         ieee80211_lost_packet(sta, info);
1184                 }
1185 
1186                 rate_control_tx_status(local, sband, status);
1187                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
1188                         ieee80211s_update_metric(local, sta, status);
1189         }
1190 
1191         if (acked || noack_success) {
1192                 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1193                 if (!pubsta)
1194                         I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1195                 if (retry_count > 0)
1196                         I802_DEBUG_INC(local->dot11RetryCount);
1197                 if (retry_count > 1)
1198                         I802_DEBUG_INC(local->dot11MultipleRetryCount);
1199         } else {
1200                 I802_DEBUG_INC(local->dot11FailedCount);
1201         }
1202 }
1203 EXPORT_SYMBOL(ieee80211_tx_status_ext);
1204 
1205 void ieee80211_tx_rate_update(struct ieee80211_hw *hw,
1206                               struct ieee80211_sta *pubsta,
1207                               struct ieee80211_tx_info *info)
1208 {
1209         struct ieee80211_local *local = hw_to_local(hw);
1210         struct ieee80211_supported_band *sband = hw->wiphy->bands[info->band];
1211         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1212         struct ieee80211_tx_status status = {
1213                 .info = info,
1214                 .sta = pubsta,
1215         };
1216 
1217         rate_control_tx_status(local, sband, &status);
1218 
1219         if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
1220                 sta->tx_stats.last_rate = info->status.rates[0];
1221 }
1222 EXPORT_SYMBOL(ieee80211_tx_rate_update);
1223 
1224 void ieee80211_tx_status_8023(struct ieee80211_hw *hw,
1225                               struct ieee80211_vif *vif,
1226                               struct sk_buff *skb)
1227 {
1228         struct ieee80211_local *local = hw_to_local(hw);
1229         struct ieee80211_sub_if_data *sdata;
1230         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1231         struct sta_info *sta;
1232         int retry_count;
1233         int rates_idx;
1234         bool acked;
1235 
1236         sdata = vif_to_sdata(vif);
1237 
1238         acked = info->flags & IEEE80211_TX_STAT_ACK;
1239         rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
1240 
1241         rcu_read_lock();
1242 
1243         if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
1244                 goto counters_update;
1245 
1246         if (IS_ERR(sta))
1247                 goto counters_update;
1248 
1249         if (!acked)
1250                 sta->status_stats.retry_failed++;
1251 
1252         if (rates_idx != -1)
1253                 sta->tx_stats.last_rate = info->status.rates[rates_idx];
1254 
1255         sta->status_stats.retry_count += retry_count;
1256 
1257         if (ieee80211_hw_check(hw, REPORTS_TX_ACK_STATUS)) {
1258                 if (acked && vif->type == NL80211_IFTYPE_STATION)
1259                         ieee80211_sta_reset_conn_monitor(sdata);
1260 
1261                 sta->status_stats.last_ack = jiffies;
1262                 if (info->flags & IEEE80211_TX_STAT_ACK) {
1263                         if (sta->status_stats.lost_packets)
1264                                 sta->status_stats.lost_packets = 0;
1265 
1266                         sta->status_stats.last_pkt_time = jiffies;
1267                 } else {
1268                         ieee80211_lost_packet(sta, info);
1269                 }
1270         }
1271 
1272 counters_update:
1273         rcu_read_unlock();
1274         ieee80211_led_tx(local);
1275 
1276         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
1277             !(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED))
1278                 goto skip_stats_update;
1279 
1280         I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1281         if (is_multicast_ether_addr(skb->data))
1282                 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1283         if (retry_count > 0)
1284                 I802_DEBUG_INC(local->dot11RetryCount);
1285         if (retry_count > 1)
1286                 I802_DEBUG_INC(local->dot11MultipleRetryCount);
1287 
1288 skip_stats_update:
1289         ieee80211_report_used_skb(local, skb, false);
1290         dev_kfree_skb(skb);
1291 }
1292 EXPORT_SYMBOL(ieee80211_tx_status_8023);
1293 
1294 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
1295 {
1296         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1297         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
1298                                     num_packets, GFP_ATOMIC);
1299 }
1300 EXPORT_SYMBOL(ieee80211_report_low_ack);
1301 
1302 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
1303 {
1304         struct ieee80211_local *local = hw_to_local(hw);
1305 
1306         ieee80211_report_used_skb(local, skb, true);
1307         dev_kfree_skb_any(skb);
1308 }
1309 EXPORT_SYMBOL(ieee80211_free_txskb);
1310 
1311 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
1312                               struct sk_buff_head *skbs)
1313 {
1314         struct sk_buff *skb;
1315 
1316         while ((skb = __skb_dequeue(skbs)))
1317                 ieee80211_free_txskb(hw, skb);
1318 }
1319 

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