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

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  1 /*
  2  * Copyright 2002-2005, Instant802 Networks, Inc.
  3  * Copyright 2005-2006, Devicescape Software, Inc.
  4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
  5  * Copyright 2008-2010  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 #include <linux/export.h>
 14 #include <linux/etherdevice.h>
 15 #include <net/mac80211.h>
 16 #include <asm/unaligned.h>
 17 #include "ieee80211_i.h"
 18 #include "rate.h"
 19 #include "mesh.h"
 20 #include "led.h"
 21 #include "wme.h"
 22 
 23 
 24 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 25                                  struct sk_buff *skb)
 26 {
 27         struct ieee80211_local *local = hw_to_local(hw);
 28         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 29         int tmp;
 30 
 31         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 32         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 33                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 34         tmp = skb_queue_len(&local->skb_queue) +
 35                 skb_queue_len(&local->skb_queue_unreliable);
 36         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 37                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 38                 ieee80211_free_txskb(hw, skb);
 39                 tmp--;
 40                 I802_DEBUG_INC(local->tx_status_drop);
 41         }
 42         tasklet_schedule(&local->tasklet);
 43 }
 44 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 45 
 46 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 47                                             struct sta_info *sta,
 48                                             struct sk_buff *skb)
 49 {
 50         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 51         struct ieee80211_hdr *hdr = (void *)skb->data;
 52         int ac;
 53 
 54         if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
 55                 ieee80211_free_txskb(&local->hw, skb);
 56                 return;
 57         }
 58 
 59         /*
 60          * This skb 'survived' a round-trip through the driver, and
 61          * hopefully the driver didn't mangle it too badly. However,
 62          * we can definitely not rely on the control information
 63          * being correct. Clear it so we don't get junk there, and
 64          * indicate that it needs new processing, but must not be
 65          * modified/encrypted again.
 66          */
 67         memset(&info->control, 0, sizeof(info->control));
 68 
 69         info->control.jiffies = jiffies;
 70         info->control.vif = &sta->sdata->vif;
 71         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
 72                        IEEE80211_TX_INTFL_RETRANSMISSION;
 73         info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
 74 
 75         sta->status_stats.filtered++;
 76 
 77         /*
 78          * Clear more-data bit on filtered frames, it might be set
 79          * but later frames might time out so it might have to be
 80          * clear again ... It's all rather unlikely (this frame
 81          * should time out first, right?) but let's not confuse
 82          * peers unnecessarily.
 83          */
 84         if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
 85                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
 86 
 87         if (ieee80211_is_data_qos(hdr->frame_control)) {
 88                 u8 *p = ieee80211_get_qos_ctl(hdr);
 89                 int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
 90 
 91                 /*
 92                  * Clear EOSP if set, this could happen e.g.
 93                  * if an absence period (us being a P2P GO)
 94                  * shortens the SP.
 95                  */
 96                 if (*p & IEEE80211_QOS_CTL_EOSP)
 97                         *p &= ~IEEE80211_QOS_CTL_EOSP;
 98                 ac = ieee802_1d_to_ac[tid & 7];
 99         } else {
100                 ac = IEEE80211_AC_BE;
101         }
102 
103         /*
104          * Clear the TX filter mask for this STA when sending the next
105          * packet. If the STA went to power save mode, this will happen
106          * when it wakes up for the next time.
107          */
108         set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
109         ieee80211_clear_fast_xmit(sta);
110 
111         /*
112          * This code races in the following way:
113          *
114          *  (1) STA sends frame indicating it will go to sleep and does so
115          *  (2) hardware/firmware adds STA to filter list, passes frame up
116          *  (3) hardware/firmware processes TX fifo and suppresses a frame
117          *  (4) we get TX status before having processed the frame and
118          *      knowing that the STA has gone to sleep.
119          *
120          * This is actually quite unlikely even when both those events are
121          * processed from interrupts coming in quickly after one another or
122          * even at the same time because we queue both TX status events and
123          * RX frames to be processed by a tasklet and process them in the
124          * same order that they were received or TX status last. Hence, there
125          * is no race as long as the frame RX is processed before the next TX
126          * status, which drivers can ensure, see below.
127          *
128          * Note that this can only happen if the hardware or firmware can
129          * actually add STAs to the filter list, if this is done by the
130          * driver in response to set_tim() (which will only reduce the race
131          * this whole filtering tries to solve, not completely solve it)
132          * this situation cannot happen.
133          *
134          * To completely solve this race drivers need to make sure that they
135          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
136          *      functions and
137          *  (b) always process RX events before TX status events if ordering
138          *      can be unknown, for example with different interrupt status
139          *      bits.
140          *  (c) if PS mode transitions are manual (i.e. the flag
141          *      %IEEE80211_HW_AP_LINK_PS is set), always process PS state
142          *      changes before calling TX status events if ordering can be
143          *      unknown.
144          */
145         if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
146             skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
147                 skb_queue_tail(&sta->tx_filtered[ac], skb);
148                 sta_info_recalc_tim(sta);
149 
150                 if (!timer_pending(&local->sta_cleanup))
151                         mod_timer(&local->sta_cleanup,
152                                   round_jiffies(jiffies +
153                                                 STA_INFO_CLEANUP_INTERVAL));
154                 return;
155         }
156 
157         if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
158             !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
159                 /* Software retry the packet once */
160                 info->flags |= IEEE80211_TX_INTFL_RETRIED;
161                 ieee80211_add_pending_skb(local, skb);
162                 return;
163         }
164 
165         ps_dbg_ratelimited(sta->sdata,
166                            "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
167                            skb_queue_len(&sta->tx_filtered[ac]),
168                            !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
169         ieee80211_free_txskb(&local->hw, skb);
170 }
171 
172 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
173 {
174         struct tid_ampdu_tx *tid_tx;
175 
176         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
177         if (!tid_tx || !tid_tx->bar_pending)
178                 return;
179 
180         tid_tx->bar_pending = false;
181         ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
182 }
183 
184 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
185 {
186         struct ieee80211_mgmt *mgmt = (void *) skb->data;
187         struct ieee80211_local *local = sta->local;
188         struct ieee80211_sub_if_data *sdata = sta->sdata;
189 
190         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
191                 sta->rx_stats.last_rx = jiffies;
192 
193         if (ieee80211_is_data_qos(mgmt->frame_control)) {
194                 struct ieee80211_hdr *hdr = (void *) skb->data;
195                 u8 *qc = ieee80211_get_qos_ctl(hdr);
196                 u16 tid = qc[0] & 0xf;
197 
198                 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
199         }
200 
201         if (ieee80211_is_action(mgmt->frame_control) &&
202             mgmt->u.action.category == WLAN_CATEGORY_HT &&
203             mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
204             ieee80211_sdata_running(sdata)) {
205                 enum ieee80211_smps_mode smps_mode;
206 
207                 switch (mgmt->u.action.u.ht_smps.smps_control) {
208                 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
209                         smps_mode = IEEE80211_SMPS_DYNAMIC;
210                         break;
211                 case WLAN_HT_SMPS_CONTROL_STATIC:
212                         smps_mode = IEEE80211_SMPS_STATIC;
213                         break;
214                 case WLAN_HT_SMPS_CONTROL_DISABLED:
215                 default: /* shouldn't happen since we don't send that */
216                         smps_mode = IEEE80211_SMPS_OFF;
217                         break;
218                 }
219 
220                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
221                         /*
222                          * This update looks racy, but isn't -- if we come
223                          * here we've definitely got a station that we're
224                          * talking to, and on a managed interface that can
225                          * only be the AP. And the only other place updating
226                          * this variable in managed mode is before association.
227                          */
228                         sdata->smps_mode = smps_mode;
229                         ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
230                 } else if (sdata->vif.type == NL80211_IFTYPE_AP ||
231                            sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
232                         sta->known_smps_mode = smps_mode;
233                 }
234         }
235 }
236 
237 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
238 {
239         struct tid_ampdu_tx *tid_tx;
240 
241         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
242         if (!tid_tx)
243                 return;
244 
245         tid_tx->failed_bar_ssn = ssn;
246         tid_tx->bar_pending = true;
247 }
248 
249 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info)
250 {
251         int len = sizeof(struct ieee80211_radiotap_header);
252 
253         /* IEEE80211_RADIOTAP_RATE rate */
254         if (info->status.rates[0].idx >= 0 &&
255             !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
256                                              IEEE80211_TX_RC_VHT_MCS)))
257                 len += 2;
258 
259         /* IEEE80211_RADIOTAP_TX_FLAGS */
260         len += 2;
261 
262         /* IEEE80211_RADIOTAP_DATA_RETRIES */
263         len += 1;
264 
265         /* IEEE80211_RADIOTAP_MCS
266          * IEEE80211_RADIOTAP_VHT */
267         if (info->status.rates[0].idx >= 0) {
268                 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
269                         len += 3;
270                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
271                         len = ALIGN(len, 2) + 12;
272         }
273 
274         return len;
275 }
276 
277 static void
278 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
279                                  struct ieee80211_supported_band *sband,
280                                  struct sk_buff *skb, int retry_count,
281                                  int rtap_len, int shift)
282 {
283         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
284         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
285         struct ieee80211_radiotap_header *rthdr;
286         unsigned char *pos;
287         u16 txflags;
288 
289         rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len);
290 
291         memset(rthdr, 0, rtap_len);
292         rthdr->it_len = cpu_to_le16(rtap_len);
293         rthdr->it_present =
294                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
295                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
296         pos = (unsigned char *)(rthdr + 1);
297 
298         /*
299          * XXX: Once radiotap gets the bitmap reset thing the vendor
300          *      extensions proposal contains, we can actually report
301          *      the whole set of tries we did.
302          */
303 
304         /* IEEE80211_RADIOTAP_RATE */
305         if (info->status.rates[0].idx >= 0 &&
306             !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
307                                              IEEE80211_TX_RC_VHT_MCS))) {
308                 u16 rate;
309 
310                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
311                 rate = sband->bitrates[info->status.rates[0].idx].bitrate;
312                 *pos = DIV_ROUND_UP(rate, 5 * (1 << shift));
313                 /* padding for tx flags */
314                 pos += 2;
315         }
316 
317         /* IEEE80211_RADIOTAP_TX_FLAGS */
318         txflags = 0;
319         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
320             !is_multicast_ether_addr(hdr->addr1))
321                 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
322 
323         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
324                 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
325         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
326                 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
327 
328         put_unaligned_le16(txflags, pos);
329         pos += 2;
330 
331         /* IEEE80211_RADIOTAP_DATA_RETRIES */
332         /* for now report the total retry_count */
333         *pos = retry_count;
334         pos++;
335 
336         if (info->status.rates[0].idx < 0)
337                 return;
338 
339         /* IEEE80211_RADIOTAP_MCS
340          * IEEE80211_RADIOTAP_VHT */
341         if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
342                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
343                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
344                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
345                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
346                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
347                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
348                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
349                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
350                 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
351                         pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
352                 pos[2] = info->status.rates[0].idx;
353                 pos += 3;
354         } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
355                 u16 known = local->hw.radiotap_vht_details &
356                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
357                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
358 
359                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
360 
361                 /* required alignment from rthdr */
362                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
363 
364                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
365                 put_unaligned_le16(known, pos);
366                 pos += 2;
367 
368                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
369                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
370                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
371                 pos++;
372 
373                 /* u8 bandwidth */
374                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
375                         *pos = 1;
376                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
377                         *pos = 4;
378                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
379                         *pos = 11;
380                 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
381                         *pos = 0;
382                 pos++;
383 
384                 /* u8 mcs_nss[4] */
385                 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
386                         ieee80211_rate_get_vht_nss(&info->status.rates[0]);
387                 pos += 4;
388 
389                 /* u8 coding */
390                 pos++;
391                 /* u8 group_id */
392                 pos++;
393                 /* u16 partial_aid */
394                 pos += 2;
395         }
396 }
397 
398 /*
399  * Handles the tx for TDLS teardown frames.
400  * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
401  */
402 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
403                                         struct ieee80211_sub_if_data *sdata,
404                                         struct sk_buff *skb, u32 flags)
405 {
406         struct sk_buff *teardown_skb;
407         struct sk_buff *orig_teardown_skb;
408         bool is_teardown = false;
409 
410         /* Get the teardown data we need and free the lock */
411         spin_lock(&sdata->u.mgd.teardown_lock);
412         teardown_skb = sdata->u.mgd.teardown_skb;
413         orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
414         if ((skb == orig_teardown_skb) && teardown_skb) {
415                 sdata->u.mgd.teardown_skb = NULL;
416                 sdata->u.mgd.orig_teardown_skb = NULL;
417                 is_teardown = true;
418         }
419         spin_unlock(&sdata->u.mgd.teardown_lock);
420 
421         if (is_teardown) {
422                 /* This mechanism relies on being able to get ACKs */
423                 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
424 
425                 /* Check if peer has ACKed */
426                 if (flags & IEEE80211_TX_STAT_ACK) {
427                         dev_kfree_skb_any(teardown_skb);
428                 } else {
429                         tdls_dbg(sdata,
430                                  "TDLS Resending teardown through AP\n");
431 
432                         ieee80211_subif_start_xmit(teardown_skb, skb->dev);
433                 }
434         }
435 }
436 
437 static struct ieee80211_sub_if_data *
438 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
439 {
440         struct ieee80211_sub_if_data *sdata;
441 
442         if (skb->dev) {
443                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
444                         if (!sdata->dev)
445                                 continue;
446 
447                         if (skb->dev == sdata->dev)
448                                 return sdata;
449                 }
450 
451                 return NULL;
452         }
453 
454         return rcu_dereference(local->p2p_sdata);
455 }
456 
457 static void ieee80211_report_ack_skb(struct ieee80211_local *local,
458                                      struct ieee80211_tx_info *info,
459                                      bool acked, bool dropped)
460 {
461         struct sk_buff *skb;
462         unsigned long flags;
463 
464         spin_lock_irqsave(&local->ack_status_lock, flags);
465         skb = idr_find(&local->ack_status_frames, info->ack_frame_id);
466         if (skb)
467                 idr_remove(&local->ack_status_frames, info->ack_frame_id);
468         spin_unlock_irqrestore(&local->ack_status_lock, flags);
469 
470         if (!skb)
471                 return;
472 
473         if (dropped) {
474                 dev_kfree_skb_any(skb);
475                 return;
476         }
477 
478         if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
479                 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
480                 struct ieee80211_sub_if_data *sdata;
481                 struct ieee80211_hdr *hdr = (void *)skb->data;
482 
483                 rcu_read_lock();
484                 sdata = ieee80211_sdata_from_skb(local, skb);
485                 if (sdata) {
486                         if (ieee80211_is_nullfunc(hdr->frame_control) ||
487                             ieee80211_is_qos_nullfunc(hdr->frame_control))
488                                 cfg80211_probe_status(sdata->dev, hdr->addr1,
489                                                       cookie, acked,
490                                                       GFP_ATOMIC);
491                         else
492                                 cfg80211_mgmt_tx_status(&sdata->wdev, cookie,
493                                                         skb->data, skb->len,
494                                                         acked, GFP_ATOMIC);
495                 }
496                 rcu_read_unlock();
497 
498                 dev_kfree_skb_any(skb);
499         } else {
500                 /* consumes skb */
501                 skb_complete_wifi_ack(skb, acked);
502         }
503 }
504 
505 static void ieee80211_report_used_skb(struct ieee80211_local *local,
506                                       struct sk_buff *skb, bool dropped)
507 {
508         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
509         struct ieee80211_hdr *hdr = (void *)skb->data;
510         bool acked = info->flags & IEEE80211_TX_STAT_ACK;
511 
512         if (dropped)
513                 acked = false;
514 
515         if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
516                 struct ieee80211_sub_if_data *sdata;
517 
518                 rcu_read_lock();
519 
520                 sdata = ieee80211_sdata_from_skb(local, skb);
521 
522                 if (!sdata) {
523                         skb->dev = NULL;
524                 } else {
525                         unsigned int hdr_size =
526                                 ieee80211_hdrlen(hdr->frame_control);
527 
528                         /* Check to see if packet is a TDLS teardown packet */
529                         if (ieee80211_is_data(hdr->frame_control) &&
530                             (ieee80211_get_tdls_action(skb, hdr_size) ==
531                              WLAN_TDLS_TEARDOWN))
532                                 ieee80211_tdls_td_tx_handle(local, sdata, skb,
533                                                             info->flags);
534                         else
535                                 ieee80211_mgd_conn_tx_status(sdata,
536                                                              hdr->frame_control,
537                                                              acked);
538                 }
539 
540                 rcu_read_unlock();
541         } else if (info->ack_frame_id) {
542                 ieee80211_report_ack_skb(local, info, acked, dropped);
543         }
544 }
545 
546 /*
547  * Use a static threshold for now, best value to be determined
548  * by testing ...
549  * Should it depend on:
550  *  - on # of retransmissions
551  *  - current throughput (higher value for higher tpt)?
552  */
553 #define STA_LOST_PKT_THRESHOLD  50
554 #define STA_LOST_TDLS_PKT_THRESHOLD     10
555 #define STA_LOST_TDLS_PKT_TIME          (10*HZ) /* 10secs since last ACK */
556 
557 static void ieee80211_lost_packet(struct sta_info *sta,
558                                   struct ieee80211_tx_info *info)
559 {
560         /* This packet was aggregated but doesn't carry status info */
561         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
562             !(info->flags & IEEE80211_TX_STAT_AMPDU))
563                 return;
564 
565         sta->status_stats.lost_packets++;
566         if (!sta->sta.tdls &&
567             sta->status_stats.lost_packets < STA_LOST_PKT_THRESHOLD)
568                 return;
569 
570         /*
571          * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD
572          * of the last packets were lost, and that no ACK was received in the
573          * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
574          * mechanism.
575          */
576         if (sta->sta.tdls &&
577             (sta->status_stats.lost_packets < STA_LOST_TDLS_PKT_THRESHOLD ||
578              time_before(jiffies,
579                          sta->status_stats.last_tdls_pkt_time +
580                          STA_LOST_TDLS_PKT_TIME)))
581                 return;
582 
583         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
584                                     sta->status_stats.lost_packets, GFP_ATOMIC);
585         sta->status_stats.lost_packets = 0;
586 }
587 
588 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
589                                   struct ieee80211_tx_info *info,
590                                   int *retry_count)
591 {
592         int rates_idx = -1;
593         int count = -1;
594         int i;
595 
596         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
597                 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
598                     !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
599                         /* just the first aggr frame carry status info */
600                         info->status.rates[i].idx = -1;
601                         info->status.rates[i].count = 0;
602                         break;
603                 } else if (info->status.rates[i].idx < 0) {
604                         break;
605                 } else if (i >= hw->max_report_rates) {
606                         /* the HW cannot have attempted that rate */
607                         info->status.rates[i].idx = -1;
608                         info->status.rates[i].count = 0;
609                         break;
610                 }
611 
612                 count += info->status.rates[i].count;
613         }
614         rates_idx = i - 1;
615 
616         if (count < 0)
617                 count = 0;
618 
619         *retry_count = count;
620         return rates_idx;
621 }
622 
623 void ieee80211_tx_status_noskb(struct ieee80211_hw *hw,
624                                struct ieee80211_sta *pubsta,
625                                struct ieee80211_tx_info *info)
626 {
627         struct ieee80211_local *local = hw_to_local(hw);
628         struct ieee80211_supported_band *sband;
629         int retry_count;
630         int rates_idx;
631         bool acked, noack_success;
632 
633         rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
634 
635         sband = hw->wiphy->bands[info->band];
636 
637         acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
638         noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
639 
640         if (pubsta) {
641                 struct sta_info *sta;
642 
643                 sta = container_of(pubsta, struct sta_info, sta);
644 
645                 if (!acked)
646                         sta->status_stats.retry_failed++;
647                 sta->status_stats.retry_count += retry_count;
648 
649                 if (acked) {
650                         sta->rx_stats.last_rx = jiffies;
651 
652                         if (sta->status_stats.lost_packets)
653                                 sta->status_stats.lost_packets = 0;
654 
655                         /* Track when last TDLS packet was ACKed */
656                         if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
657                                 sta->status_stats.last_tdls_pkt_time = jiffies;
658                 } else {
659                         ieee80211_lost_packet(sta, info);
660                 }
661 
662                 rate_control_tx_status_noskb(local, sband, sta, info);
663         }
664 
665         if (acked || noack_success) {
666                 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
667                 if (!pubsta)
668                         I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
669                 if (retry_count > 0)
670                         I802_DEBUG_INC(local->dot11RetryCount);
671                 if (retry_count > 1)
672                         I802_DEBUG_INC(local->dot11MultipleRetryCount);
673         } else {
674                 I802_DEBUG_INC(local->dot11FailedCount);
675         }
676 }
677 EXPORT_SYMBOL(ieee80211_tx_status_noskb);
678 
679 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
680                           struct ieee80211_supported_band *sband,
681                           int retry_count, int shift, bool send_to_cooked)
682 {
683         struct sk_buff *skb2;
684         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
685         struct ieee80211_sub_if_data *sdata;
686         struct net_device *prev_dev = NULL;
687         int rtap_len;
688 
689         /* send frame to monitor interfaces now */
690         rtap_len = ieee80211_tx_radiotap_len(info);
691         if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
692                 pr_err("ieee80211_tx_status: headroom too small\n");
693                 dev_kfree_skb(skb);
694                 return;
695         }
696         ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
697                                          rtap_len, shift);
698 
699         /* XXX: is this sufficient for BPF? */
700         skb_reset_mac_header(skb);
701         skb->ip_summed = CHECKSUM_UNNECESSARY;
702         skb->pkt_type = PACKET_OTHERHOST;
703         skb->protocol = htons(ETH_P_802_2);
704         memset(skb->cb, 0, sizeof(skb->cb));
705 
706         rcu_read_lock();
707         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
708                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
709                         if (!ieee80211_sdata_running(sdata))
710                                 continue;
711 
712                         if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
713                             !send_to_cooked)
714                                 continue;
715 
716                         if (prev_dev) {
717                                 skb2 = skb_clone(skb, GFP_ATOMIC);
718                                 if (skb2) {
719                                         skb2->dev = prev_dev;
720                                         netif_rx(skb2);
721                                 }
722                         }
723 
724                         prev_dev = sdata->dev;
725                 }
726         }
727         if (prev_dev) {
728                 skb->dev = prev_dev;
729                 netif_rx(skb);
730                 skb = NULL;
731         }
732         rcu_read_unlock();
733         dev_kfree_skb(skb);
734 }
735 
736 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
737 {
738         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
739         struct ieee80211_local *local = hw_to_local(hw);
740         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
741         __le16 fc;
742         struct ieee80211_supported_band *sband;
743         struct sta_info *sta;
744         struct rhash_head *tmp;
745         int retry_count;
746         int rates_idx;
747         bool send_to_cooked;
748         bool acked;
749         struct ieee80211_bar *bar;
750         int shift = 0;
751         int tid = IEEE80211_NUM_TIDS;
752         const struct bucket_table *tbl;
753 
754         rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
755 
756         rcu_read_lock();
757 
758         sband = local->hw.wiphy->bands[info->band];
759         fc = hdr->frame_control;
760 
761         tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
762 
763         for_each_sta_info(local, tbl, hdr->addr1, sta, tmp) {
764                 /* skip wrong virtual interface */
765                 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr))
766                         continue;
767 
768                 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
769 
770                 if (info->flags & IEEE80211_TX_STATUS_EOSP)
771                         clear_sta_flag(sta, WLAN_STA_SP);
772 
773                 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
774                 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
775                         /*
776                          * The STA is in power save mode, so assume
777                          * that this TX packet failed because of that.
778                          */
779                         ieee80211_handle_filtered_frame(local, sta, skb);
780                         rcu_read_unlock();
781                         return;
782                 }
783 
784                 /* mesh Peer Service Period support */
785                 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
786                     ieee80211_is_data_qos(fc))
787                         ieee80211_mpsp_trigger_process(
788                                         ieee80211_get_qos_ctl(hdr),
789                                         sta, true, acked);
790 
791                 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
792                     (ieee80211_is_data(hdr->frame_control)) &&
793                     (rates_idx != -1))
794                         sta->tx_stats.last_rate =
795                                 info->status.rates[rates_idx];
796 
797                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
798                     (ieee80211_is_data_qos(fc))) {
799                         u16 ssn;
800                         u8 *qc;
801 
802                         qc = ieee80211_get_qos_ctl(hdr);
803                         tid = qc[0] & 0xf;
804                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
805                                                 & IEEE80211_SCTL_SEQ);
806                         ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
807                                            tid, ssn);
808                 } else if (ieee80211_is_data_qos(fc)) {
809                         u8 *qc = ieee80211_get_qos_ctl(hdr);
810 
811                         tid = qc[0] & 0xf;
812                 }
813 
814                 if (!acked && ieee80211_is_back_req(fc)) {
815                         u16 control;
816 
817                         /*
818                          * BAR failed, store the last SSN and retry sending
819                          * the BAR when the next unicast transmission on the
820                          * same TID succeeds.
821                          */
822                         bar = (struct ieee80211_bar *) skb->data;
823                         control = le16_to_cpu(bar->control);
824                         if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
825                                 u16 ssn = le16_to_cpu(bar->start_seq_num);
826 
827                                 tid = (control &
828                                        IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
829                                       IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
830 
831                                 ieee80211_set_bar_pending(sta, tid, ssn);
832                         }
833                 }
834 
835                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
836                         ieee80211_handle_filtered_frame(local, sta, skb);
837                         rcu_read_unlock();
838                         return;
839                 } else {
840                         if (!acked)
841                                 sta->status_stats.retry_failed++;
842                         sta->status_stats.retry_count += retry_count;
843 
844                         if (ieee80211_is_data_present(fc)) {
845                                 if (!acked)
846                                         sta->status_stats.msdu_failed[tid]++;
847 
848                                 sta->status_stats.msdu_retries[tid] +=
849                                         retry_count;
850                         }
851                 }
852 
853                 rate_control_tx_status(local, sband, sta, skb);
854                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
855                         ieee80211s_update_metric(local, sta, skb);
856 
857                 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
858                         ieee80211_frame_acked(sta, skb);
859 
860                 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
861                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
862                         ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data,
863                                                 acked, info->status.tx_time);
864 
865                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
866                         if (info->flags & IEEE80211_TX_STAT_ACK) {
867                                 if (sta->status_stats.lost_packets)
868                                         sta->status_stats.lost_packets = 0;
869 
870                                 /* Track when last TDLS packet was ACKed */
871                                 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
872                                         sta->status_stats.last_tdls_pkt_time =
873                                                 jiffies;
874                         } else {
875                                 ieee80211_lost_packet(sta, info);
876                         }
877                 }
878         }
879 
880         rcu_read_unlock();
881 
882         ieee80211_led_tx(local);
883 
884         /* SNMP counters
885          * Fragments are passed to low-level drivers as separate skbs, so these
886          * are actually fragments, not frames. Update frame counters only for
887          * the first fragment of the frame. */
888         if ((info->flags & IEEE80211_TX_STAT_ACK) ||
889             (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
890                 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
891                         I802_DEBUG_INC(local->dot11TransmittedFrameCount);
892                         if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
893                                 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
894                         if (retry_count > 0)
895                                 I802_DEBUG_INC(local->dot11RetryCount);
896                         if (retry_count > 1)
897                                 I802_DEBUG_INC(local->dot11MultipleRetryCount);
898                 }
899 
900                 /* This counter shall be incremented for an acknowledged MPDU
901                  * with an individual address in the address 1 field or an MPDU
902                  * with a multicast address in the address 1 field of type Data
903                  * or Management. */
904                 if (!is_multicast_ether_addr(hdr->addr1) ||
905                     ieee80211_is_data(fc) ||
906                     ieee80211_is_mgmt(fc))
907                         I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
908         } else {
909                 if (ieee80211_is_first_frag(hdr->seq_ctrl))
910                         I802_DEBUG_INC(local->dot11FailedCount);
911         }
912 
913         if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
914             ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
915             !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
916             local->ps_sdata && !(local->scanning)) {
917                 if (info->flags & IEEE80211_TX_STAT_ACK) {
918                         local->ps_sdata->u.mgd.flags |=
919                                         IEEE80211_STA_NULLFUNC_ACKED;
920                 } else
921                         mod_timer(&local->dynamic_ps_timer, jiffies +
922                                         msecs_to_jiffies(10));
923         }
924 
925         ieee80211_report_used_skb(local, skb, false);
926 
927         /* this was a transmitted frame, but now we want to reuse it */
928         skb_orphan(skb);
929 
930         /* Need to make a copy before skb->cb gets cleared */
931         send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
932                          !(ieee80211_is_data(fc));
933 
934         /*
935          * This is a bit racy but we can avoid a lot of work
936          * with this test...
937          */
938         if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
939                 dev_kfree_skb(skb);
940                 return;
941         }
942 
943         /* send to monitor interfaces */
944         ieee80211_tx_monitor(local, skb, sband, retry_count, shift, send_to_cooked);
945 }
946 EXPORT_SYMBOL(ieee80211_tx_status);
947 
948 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
949 {
950         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
951         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
952                                     num_packets, GFP_ATOMIC);
953 }
954 EXPORT_SYMBOL(ieee80211_report_low_ack);
955 
956 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
957 {
958         struct ieee80211_local *local = hw_to_local(hw);
959 
960         ieee80211_report_used_skb(local, skb, true);
961         dev_kfree_skb_any(skb);
962 }
963 EXPORT_SYMBOL(ieee80211_free_txskb);
964 
965 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
966                               struct sk_buff_head *skbs)
967 {
968         struct sk_buff *skb;
969 
970         while ((skb = __skb_dequeue(skbs)))
971                 ieee80211_free_txskb(hw, skb);
972 }
973 

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