Merge tag 'trace-v4.17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
[linux-2.6-microblaze.git] / net / mac80211 / status.c
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_TX_CTL_AMPDU)) {
56                 ieee80211_free_txskb(&local->hw, skb);
57                 return;
58         }
59
60         /*
61          * This skb 'survived' a round-trip through the driver, and
62          * hopefully the driver didn't mangle it too badly. However,
63          * we can definitely not rely on the control information
64          * being correct. Clear it so we don't get junk there, and
65          * indicate that it needs new processing, but must not be
66          * modified/encrypted again.
67          */
68         memset(&info->control, 0, sizeof(info->control));
69
70         info->control.jiffies = jiffies;
71         info->control.vif = &sta->sdata->vif;
72         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
73                        IEEE80211_TX_INTFL_RETRANSMISSION;
74         info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
75
76         sta->status_stats.filtered++;
77
78         /*
79          * Clear more-data bit on filtered frames, it might be set
80          * but later frames might time out so it might have to be
81          * clear again ... It's all rather unlikely (this frame
82          * should time out first, right?) but let's not confuse
83          * peers unnecessarily.
84          */
85         if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
86                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
87
88         if (ieee80211_is_data_qos(hdr->frame_control)) {
89                 u8 *p = ieee80211_get_qos_ctl(hdr);
90                 int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
91
92                 /*
93                  * Clear EOSP if set, this could happen e.g.
94                  * if an absence period (us being a P2P GO)
95                  * shortens the SP.
96                  */
97                 if (*p & IEEE80211_QOS_CTL_EOSP)
98                         *p &= ~IEEE80211_QOS_CTL_EOSP;
99                 ac = ieee80211_ac_from_tid(tid);
100         } else {
101                 ac = IEEE80211_AC_BE;
102         }
103
104         /*
105          * Clear the TX filter mask for this STA when sending the next
106          * packet. If the STA went to power save mode, this will happen
107          * when it wakes up for the next time.
108          */
109         set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
110         ieee80211_clear_fast_xmit(sta);
111
112         /*
113          * This code races in the following way:
114          *
115          *  (1) STA sends frame indicating it will go to sleep and does so
116          *  (2) hardware/firmware adds STA to filter list, passes frame up
117          *  (3) hardware/firmware processes TX fifo and suppresses a frame
118          *  (4) we get TX status before having processed the frame and
119          *      knowing that the STA has gone to sleep.
120          *
121          * This is actually quite unlikely even when both those events are
122          * processed from interrupts coming in quickly after one another or
123          * even at the same time because we queue both TX status events and
124          * RX frames to be processed by a tasklet and process them in the
125          * same order that they were received or TX status last. Hence, there
126          * is no race as long as the frame RX is processed before the next TX
127          * status, which drivers can ensure, see below.
128          *
129          * Note that this can only happen if the hardware or firmware can
130          * actually add STAs to the filter list, if this is done by the
131          * driver in response to set_tim() (which will only reduce the race
132          * this whole filtering tries to solve, not completely solve it)
133          * this situation cannot happen.
134          *
135          * To completely solve this race drivers need to make sure that they
136          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
137          *      functions and
138          *  (b) always process RX events before TX status events if ordering
139          *      can be unknown, for example with different interrupt status
140          *      bits.
141          *  (c) if PS mode transitions are manual (i.e. the flag
142          *      %IEEE80211_HW_AP_LINK_PS is set), always process PS state
143          *      changes before calling TX status events if ordering can be
144          *      unknown.
145          */
146         if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
147             skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
148                 skb_queue_tail(&sta->tx_filtered[ac], skb);
149                 sta_info_recalc_tim(sta);
150
151                 if (!timer_pending(&local->sta_cleanup))
152                         mod_timer(&local->sta_cleanup,
153                                   round_jiffies(jiffies +
154                                                 STA_INFO_CLEANUP_INTERVAL));
155                 return;
156         }
157
158         if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
159             !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
160                 /* Software retry the packet once */
161                 info->flags |= IEEE80211_TX_INTFL_RETRIED;
162                 ieee80211_add_pending_skb(local, skb);
163                 return;
164         }
165
166         ps_dbg_ratelimited(sta->sdata,
167                            "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
168                            skb_queue_len(&sta->tx_filtered[ac]),
169                            !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
170         ieee80211_free_txskb(&local->hw, skb);
171 }
172
173 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
174 {
175         struct tid_ampdu_tx *tid_tx;
176
177         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
178         if (!tid_tx || !tid_tx->bar_pending)
179                 return;
180
181         tid_tx->bar_pending = false;
182         ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
183 }
184
185 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
186 {
187         struct ieee80211_mgmt *mgmt = (void *) skb->data;
188         struct ieee80211_local *local = sta->local;
189         struct ieee80211_sub_if_data *sdata = sta->sdata;
190         struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
191
192         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
193                 sta->status_stats.last_ack = jiffies;
194                 if (txinfo->status.is_valid_ack_signal) {
195                         sta->status_stats.last_ack_signal =
196                                          (s8)txinfo->status.ack_signal;
197                         sta->status_stats.ack_signal_filled = true;
198                 }
199         }
200
201         if (ieee80211_is_data_qos(mgmt->frame_control)) {
202                 struct ieee80211_hdr *hdr = (void *) skb->data;
203                 u8 *qc = ieee80211_get_qos_ctl(hdr);
204                 u16 tid = qc[0] & 0xf;
205
206                 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
207         }
208
209         if (ieee80211_is_action(mgmt->frame_control) &&
210             !ieee80211_has_protected(mgmt->frame_control) &&
211             mgmt->u.action.category == WLAN_CATEGORY_HT &&
212             mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
213             ieee80211_sdata_running(sdata)) {
214                 enum ieee80211_smps_mode smps_mode;
215
216                 switch (mgmt->u.action.u.ht_smps.smps_control) {
217                 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
218                         smps_mode = IEEE80211_SMPS_DYNAMIC;
219                         break;
220                 case WLAN_HT_SMPS_CONTROL_STATIC:
221                         smps_mode = IEEE80211_SMPS_STATIC;
222                         break;
223                 case WLAN_HT_SMPS_CONTROL_DISABLED:
224                 default: /* shouldn't happen since we don't send that */
225                         smps_mode = IEEE80211_SMPS_OFF;
226                         break;
227                 }
228
229                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
230                         /*
231                          * This update looks racy, but isn't -- if we come
232                          * here we've definitely got a station that we're
233                          * talking to, and on a managed interface that can
234                          * only be the AP. And the only other place updating
235                          * this variable in managed mode is before association.
236                          */
237                         sdata->smps_mode = smps_mode;
238                         ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
239                 } else if (sdata->vif.type == NL80211_IFTYPE_AP ||
240                            sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
241                         sta->known_smps_mode = smps_mode;
242                 }
243         }
244 }
245
246 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
247 {
248         struct tid_ampdu_tx *tid_tx;
249
250         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
251         if (!tid_tx)
252                 return;
253
254         tid_tx->failed_bar_ssn = ssn;
255         tid_tx->bar_pending = true;
256 }
257
258 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info)
259 {
260         int len = sizeof(struct ieee80211_radiotap_header);
261
262         /* IEEE80211_RADIOTAP_RATE rate */
263         if (info->status.rates[0].idx >= 0 &&
264             !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
265                                              IEEE80211_TX_RC_VHT_MCS)))
266                 len += 2;
267
268         /* IEEE80211_RADIOTAP_TX_FLAGS */
269         len += 2;
270
271         /* IEEE80211_RADIOTAP_DATA_RETRIES */
272         len += 1;
273
274         /* IEEE80211_RADIOTAP_MCS
275          * IEEE80211_RADIOTAP_VHT */
276         if (info->status.rates[0].idx >= 0) {
277                 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
278                         len += 3;
279                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
280                         len = ALIGN(len, 2) + 12;
281         }
282
283         return len;
284 }
285
286 static void
287 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
288                                  struct ieee80211_supported_band *sband,
289                                  struct sk_buff *skb, int retry_count,
290                                  int rtap_len, int shift)
291 {
292         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
293         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
294         struct ieee80211_radiotap_header *rthdr;
295         unsigned char *pos;
296         u16 txflags;
297
298         rthdr = skb_push(skb, rtap_len);
299
300         memset(rthdr, 0, rtap_len);
301         rthdr->it_len = cpu_to_le16(rtap_len);
302         rthdr->it_present =
303                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
304                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
305         pos = (unsigned char *)(rthdr + 1);
306
307         /*
308          * XXX: Once radiotap gets the bitmap reset thing the vendor
309          *      extensions proposal contains, we can actually report
310          *      the whole set of tries we did.
311          */
312
313         /* IEEE80211_RADIOTAP_RATE */
314         if (info->status.rates[0].idx >= 0 &&
315             !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
316                                              IEEE80211_TX_RC_VHT_MCS))) {
317                 u16 rate;
318
319                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
320                 rate = sband->bitrates[info->status.rates[0].idx].bitrate;
321                 *pos = DIV_ROUND_UP(rate, 5 * (1 << shift));
322                 /* padding for tx flags */
323                 pos += 2;
324         }
325
326         /* IEEE80211_RADIOTAP_TX_FLAGS */
327         txflags = 0;
328         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
329             !is_multicast_ether_addr(hdr->addr1))
330                 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
331
332         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
333                 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
334         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
335                 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
336
337         put_unaligned_le16(txflags, pos);
338         pos += 2;
339
340         /* IEEE80211_RADIOTAP_DATA_RETRIES */
341         /* for now report the total retry_count */
342         *pos = retry_count;
343         pos++;
344
345         if (info->status.rates[0].idx < 0)
346                 return;
347
348         /* IEEE80211_RADIOTAP_MCS
349          * IEEE80211_RADIOTAP_VHT */
350         if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
351                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
352                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
353                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
354                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
355                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
356                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
357                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
358                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
359                 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
360                         pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
361                 pos[2] = info->status.rates[0].idx;
362                 pos += 3;
363         } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
364                 u16 known = local->hw.radiotap_vht_details &
365                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
366                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
367
368                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
369
370                 /* required alignment from rthdr */
371                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
372
373                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
374                 put_unaligned_le16(known, pos);
375                 pos += 2;
376
377                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
378                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
379                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
380                 pos++;
381
382                 /* u8 bandwidth */
383                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
384                         *pos = 1;
385                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
386                         *pos = 4;
387                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
388                         *pos = 11;
389                 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
390                         *pos = 0;
391                 pos++;
392
393                 /* u8 mcs_nss[4] */
394                 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
395                         ieee80211_rate_get_vht_nss(&info->status.rates[0]);
396                 pos += 4;
397
398                 /* u8 coding */
399                 pos++;
400                 /* u8 group_id */
401                 pos++;
402                 /* u16 partial_aid */
403                 pos += 2;
404         }
405 }
406
407 /*
408  * Handles the tx for TDLS teardown frames.
409  * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
410  */
411 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
412                                         struct ieee80211_sub_if_data *sdata,
413                                         struct sk_buff *skb, u32 flags)
414 {
415         struct sk_buff *teardown_skb;
416         struct sk_buff *orig_teardown_skb;
417         bool is_teardown = false;
418
419         /* Get the teardown data we need and free the lock */
420         spin_lock(&sdata->u.mgd.teardown_lock);
421         teardown_skb = sdata->u.mgd.teardown_skb;
422         orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
423         if ((skb == orig_teardown_skb) && teardown_skb) {
424                 sdata->u.mgd.teardown_skb = NULL;
425                 sdata->u.mgd.orig_teardown_skb = NULL;
426                 is_teardown = true;
427         }
428         spin_unlock(&sdata->u.mgd.teardown_lock);
429
430         if (is_teardown) {
431                 /* This mechanism relies on being able to get ACKs */
432                 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
433
434                 /* Check if peer has ACKed */
435                 if (flags & IEEE80211_TX_STAT_ACK) {
436                         dev_kfree_skb_any(teardown_skb);
437                 } else {
438                         tdls_dbg(sdata,
439                                  "TDLS Resending teardown through AP\n");
440
441                         ieee80211_subif_start_xmit(teardown_skb, skb->dev);
442                 }
443         }
444 }
445
446 static struct ieee80211_sub_if_data *
447 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
448 {
449         struct ieee80211_sub_if_data *sdata;
450
451         if (skb->dev) {
452                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
453                         if (!sdata->dev)
454                                 continue;
455
456                         if (skb->dev == sdata->dev)
457                                 return sdata;
458                 }
459
460                 return NULL;
461         }
462
463         return rcu_dereference(local->p2p_sdata);
464 }
465
466 static void ieee80211_report_ack_skb(struct ieee80211_local *local,
467                                      struct ieee80211_tx_info *info,
468                                      bool acked, bool dropped)
469 {
470         struct sk_buff *skb;
471         unsigned long flags;
472
473         spin_lock_irqsave(&local->ack_status_lock, flags);
474         skb = idr_remove(&local->ack_status_frames, info->ack_frame_id);
475         spin_unlock_irqrestore(&local->ack_status_lock, flags);
476
477         if (!skb)
478                 return;
479
480         if (dropped) {
481                 dev_kfree_skb_any(skb);
482                 return;
483         }
484
485         if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
486                 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
487                 struct ieee80211_sub_if_data *sdata;
488                 struct ieee80211_hdr *hdr = (void *)skb->data;
489
490                 rcu_read_lock();
491                 sdata = ieee80211_sdata_from_skb(local, skb);
492                 if (sdata) {
493                         if (ieee80211_is_nullfunc(hdr->frame_control) ||
494                             ieee80211_is_qos_nullfunc(hdr->frame_control))
495                                 cfg80211_probe_status(sdata->dev, hdr->addr1,
496                                                       cookie, acked,
497                                                       info->status.ack_signal,
498                                                       info->status.is_valid_ack_signal,
499                                                       GFP_ATOMIC);
500                         else
501                                 cfg80211_mgmt_tx_status(&sdata->wdev, cookie,
502                                                         skb->data, skb->len,
503                                                         acked, GFP_ATOMIC);
504                 }
505                 rcu_read_unlock();
506
507                 dev_kfree_skb_any(skb);
508         } else {
509                 /* consumes skb */
510                 skb_complete_wifi_ack(skb, acked);
511         }
512 }
513
514 static void ieee80211_report_used_skb(struct ieee80211_local *local,
515                                       struct sk_buff *skb, bool dropped)
516 {
517         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
518         struct ieee80211_hdr *hdr = (void *)skb->data;
519         bool acked = info->flags & IEEE80211_TX_STAT_ACK;
520
521         if (dropped)
522                 acked = false;
523
524         if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
525                 struct ieee80211_sub_if_data *sdata;
526
527                 rcu_read_lock();
528
529                 sdata = ieee80211_sdata_from_skb(local, skb);
530
531                 if (!sdata) {
532                         skb->dev = NULL;
533                 } else {
534                         unsigned int hdr_size =
535                                 ieee80211_hdrlen(hdr->frame_control);
536
537                         /* Check to see if packet is a TDLS teardown packet */
538                         if (ieee80211_is_data(hdr->frame_control) &&
539                             (ieee80211_get_tdls_action(skb, hdr_size) ==
540                              WLAN_TDLS_TEARDOWN))
541                                 ieee80211_tdls_td_tx_handle(local, sdata, skb,
542                                                             info->flags);
543                         else
544                                 ieee80211_mgd_conn_tx_status(sdata,
545                                                              hdr->frame_control,
546                                                              acked);
547                 }
548
549                 rcu_read_unlock();
550         } else if (info->ack_frame_id) {
551                 ieee80211_report_ack_skb(local, info, acked, dropped);
552         }
553
554         if (!dropped && skb->destructor) {
555                 skb->wifi_acked_valid = 1;
556                 skb->wifi_acked = acked;
557         }
558
559         ieee80211_led_tx(local);
560 }
561
562 /*
563  * Use a static threshold for now, best value to be determined
564  * by testing ...
565  * Should it depend on:
566  *  - on # of retransmissions
567  *  - current throughput (higher value for higher tpt)?
568  */
569 #define STA_LOST_PKT_THRESHOLD  50
570 #define STA_LOST_TDLS_PKT_THRESHOLD     10
571 #define STA_LOST_TDLS_PKT_TIME          (10*HZ) /* 10secs since last ACK */
572
573 static void ieee80211_lost_packet(struct sta_info *sta,
574                                   struct ieee80211_tx_info *info)
575 {
576         /* If driver relies on its own algorithm for station kickout, skip
577          * mac80211 packet loss mechanism.
578          */
579         if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
580                 return;
581
582         /* This packet was aggregated but doesn't carry status info */
583         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
584             !(info->flags & IEEE80211_TX_STAT_AMPDU))
585                 return;
586
587         sta->status_stats.lost_packets++;
588         if (!sta->sta.tdls &&
589             sta->status_stats.lost_packets < STA_LOST_PKT_THRESHOLD)
590                 return;
591
592         /*
593          * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD
594          * of the last packets were lost, and that no ACK was received in the
595          * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
596          * mechanism.
597          */
598         if (sta->sta.tdls &&
599             (sta->status_stats.lost_packets < STA_LOST_TDLS_PKT_THRESHOLD ||
600              time_before(jiffies,
601                          sta->status_stats.last_tdls_pkt_time +
602                          STA_LOST_TDLS_PKT_TIME)))
603                 return;
604
605         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
606                                     sta->status_stats.lost_packets, GFP_ATOMIC);
607         sta->status_stats.lost_packets = 0;
608 }
609
610 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
611                                   struct ieee80211_tx_info *info,
612                                   int *retry_count)
613 {
614         int rates_idx = -1;
615         int count = -1;
616         int i;
617
618         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
619                 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
620                     !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
621                         /* just the first aggr frame carry status info */
622                         info->status.rates[i].idx = -1;
623                         info->status.rates[i].count = 0;
624                         break;
625                 } else if (info->status.rates[i].idx < 0) {
626                         break;
627                 } else if (i >= hw->max_report_rates) {
628                         /* the HW cannot have attempted that rate */
629                         info->status.rates[i].idx = -1;
630                         info->status.rates[i].count = 0;
631                         break;
632                 }
633
634                 count += info->status.rates[i].count;
635         }
636         rates_idx = i - 1;
637
638         if (count < 0)
639                 count = 0;
640
641         *retry_count = count;
642         return rates_idx;
643 }
644
645 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
646                           struct ieee80211_supported_band *sband,
647                           int retry_count, int shift, bool send_to_cooked)
648 {
649         struct sk_buff *skb2;
650         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
651         struct ieee80211_sub_if_data *sdata;
652         struct net_device *prev_dev = NULL;
653         int rtap_len;
654
655         /* send frame to monitor interfaces now */
656         rtap_len = ieee80211_tx_radiotap_len(info);
657         if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
658                 pr_err("ieee80211_tx_status: headroom too small\n");
659                 dev_kfree_skb(skb);
660                 return;
661         }
662         ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
663                                          rtap_len, shift);
664
665         /* XXX: is this sufficient for BPF? */
666         skb_reset_mac_header(skb);
667         skb->ip_summed = CHECKSUM_UNNECESSARY;
668         skb->pkt_type = PACKET_OTHERHOST;
669         skb->protocol = htons(ETH_P_802_2);
670         memset(skb->cb, 0, sizeof(skb->cb));
671
672         rcu_read_lock();
673         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
674                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
675                         if (!ieee80211_sdata_running(sdata))
676                                 continue;
677
678                         if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
679                             !send_to_cooked)
680                                 continue;
681
682                         if (prev_dev) {
683                                 skb2 = skb_clone(skb, GFP_ATOMIC);
684                                 if (skb2) {
685                                         skb2->dev = prev_dev;
686                                         netif_rx(skb2);
687                                 }
688                         }
689
690                         prev_dev = sdata->dev;
691                 }
692         }
693         if (prev_dev) {
694                 skb->dev = prev_dev;
695                 netif_rx(skb);
696                 skb = NULL;
697         }
698         rcu_read_unlock();
699         dev_kfree_skb(skb);
700 }
701
702 static void __ieee80211_tx_status(struct ieee80211_hw *hw,
703                                   struct ieee80211_tx_status *status)
704 {
705         struct sk_buff *skb = status->skb;
706         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
707         struct ieee80211_local *local = hw_to_local(hw);
708         struct ieee80211_tx_info *info = status->info;
709         struct sta_info *sta;
710         __le16 fc;
711         struct ieee80211_supported_band *sband;
712         int retry_count;
713         int rates_idx;
714         bool send_to_cooked;
715         bool acked;
716         struct ieee80211_bar *bar;
717         int shift = 0;
718         int tid = IEEE80211_NUM_TIDS;
719
720         rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
721
722         sband = local->hw.wiphy->bands[info->band];
723         fc = hdr->frame_control;
724
725         if (status->sta) {
726                 sta = container_of(status->sta, struct sta_info, sta);
727                 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
728
729                 if (info->flags & IEEE80211_TX_STATUS_EOSP)
730                         clear_sta_flag(sta, WLAN_STA_SP);
731
732                 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
733
734                 /* mesh Peer Service Period support */
735                 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
736                     ieee80211_is_data_qos(fc))
737                         ieee80211_mpsp_trigger_process(
738                                 ieee80211_get_qos_ctl(hdr), sta, true, acked);
739
740                 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
741                         /*
742                          * The STA is in power save mode, so assume
743                          * that this TX packet failed because of that.
744                          */
745                         ieee80211_handle_filtered_frame(local, sta, skb);
746                         return;
747                 }
748
749                 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
750                     (ieee80211_is_data(hdr->frame_control)) &&
751                     (rates_idx != -1))
752                         sta->tx_stats.last_rate =
753                                 info->status.rates[rates_idx];
754
755                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
756                     (ieee80211_is_data_qos(fc))) {
757                         u16 ssn;
758                         u8 *qc;
759
760                         qc = ieee80211_get_qos_ctl(hdr);
761                         tid = qc[0] & 0xf;
762                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
763                                                 & IEEE80211_SCTL_SEQ);
764                         ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
765                                            tid, ssn);
766                 } else if (ieee80211_is_data_qos(fc)) {
767                         u8 *qc = ieee80211_get_qos_ctl(hdr);
768
769                         tid = qc[0] & 0xf;
770                 }
771
772                 if (!acked && ieee80211_is_back_req(fc)) {
773                         u16 control;
774
775                         /*
776                          * BAR failed, store the last SSN and retry sending
777                          * the BAR when the next unicast transmission on the
778                          * same TID succeeds.
779                          */
780                         bar = (struct ieee80211_bar *) skb->data;
781                         control = le16_to_cpu(bar->control);
782                         if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
783                                 u16 ssn = le16_to_cpu(bar->start_seq_num);
784
785                                 tid = (control &
786                                        IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
787                                       IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
788
789                                 ieee80211_set_bar_pending(sta, tid, ssn);
790                         }
791                 }
792
793                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
794                         ieee80211_handle_filtered_frame(local, sta, skb);
795                         return;
796                 } else {
797                         if (!acked)
798                                 sta->status_stats.retry_failed++;
799                         sta->status_stats.retry_count += retry_count;
800
801                         if (ieee80211_is_data_present(fc)) {
802                                 if (!acked)
803                                         sta->status_stats.msdu_failed[tid]++;
804
805                                 sta->status_stats.msdu_retries[tid] +=
806                                         retry_count;
807                         }
808                 }
809
810                 rate_control_tx_status(local, sband, status);
811                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
812                         ieee80211s_update_metric(local, sta, skb);
813
814                 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
815                         ieee80211_frame_acked(sta, skb);
816
817                 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
818                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
819                         ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data,
820                                                 acked, info->status.tx_time);
821
822                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
823                         if (info->flags & IEEE80211_TX_STAT_ACK) {
824                                 if (sta->status_stats.lost_packets)
825                                         sta->status_stats.lost_packets = 0;
826
827                                 /* Track when last TDLS packet was ACKed */
828                                 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
829                                         sta->status_stats.last_tdls_pkt_time =
830                                                 jiffies;
831                         } else {
832                                 ieee80211_lost_packet(sta, info);
833                         }
834                 }
835         }
836
837         /* SNMP counters
838          * Fragments are passed to low-level drivers as separate skbs, so these
839          * are actually fragments, not frames. Update frame counters only for
840          * the first fragment of the frame. */
841         if ((info->flags & IEEE80211_TX_STAT_ACK) ||
842             (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
843                 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
844                         I802_DEBUG_INC(local->dot11TransmittedFrameCount);
845                         if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
846                                 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
847                         if (retry_count > 0)
848                                 I802_DEBUG_INC(local->dot11RetryCount);
849                         if (retry_count > 1)
850                                 I802_DEBUG_INC(local->dot11MultipleRetryCount);
851                 }
852
853                 /* This counter shall be incremented for an acknowledged MPDU
854                  * with an individual address in the address 1 field or an MPDU
855                  * with a multicast address in the address 1 field of type Data
856                  * or Management. */
857                 if (!is_multicast_ether_addr(hdr->addr1) ||
858                     ieee80211_is_data(fc) ||
859                     ieee80211_is_mgmt(fc))
860                         I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
861         } else {
862                 if (ieee80211_is_first_frag(hdr->seq_ctrl))
863                         I802_DEBUG_INC(local->dot11FailedCount);
864         }
865
866         if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
867             ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
868             !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
869             local->ps_sdata && !(local->scanning)) {
870                 if (info->flags & IEEE80211_TX_STAT_ACK) {
871                         local->ps_sdata->u.mgd.flags |=
872                                         IEEE80211_STA_NULLFUNC_ACKED;
873                 } else
874                         mod_timer(&local->dynamic_ps_timer, jiffies +
875                                         msecs_to_jiffies(10));
876         }
877
878         ieee80211_report_used_skb(local, skb, false);
879
880         /* this was a transmitted frame, but now we want to reuse it */
881         skb_orphan(skb);
882
883         /* Need to make a copy before skb->cb gets cleared */
884         send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
885                          !(ieee80211_is_data(fc));
886
887         /*
888          * This is a bit racy but we can avoid a lot of work
889          * with this test...
890          */
891         if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
892                 dev_kfree_skb(skb);
893                 return;
894         }
895
896         /* send to monitor interfaces */
897         ieee80211_tx_monitor(local, skb, sband, retry_count, shift, send_to_cooked);
898 }
899
900 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
901 {
902         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
903         struct ieee80211_local *local = hw_to_local(hw);
904         struct ieee80211_tx_status status = {
905                 .skb = skb,
906                 .info = IEEE80211_SKB_CB(skb),
907         };
908         struct rhlist_head *tmp;
909         struct sta_info *sta;
910
911         rcu_read_lock();
912
913         for_each_sta_info(local, hdr->addr1, sta, tmp) {
914                 /* skip wrong virtual interface */
915                 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr))
916                         continue;
917
918                 status.sta = &sta->sta;
919                 break;
920         }
921
922         __ieee80211_tx_status(hw, &status);
923         rcu_read_unlock();
924 }
925 EXPORT_SYMBOL(ieee80211_tx_status);
926
927 void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
928                              struct ieee80211_tx_status *status)
929 {
930         struct ieee80211_local *local = hw_to_local(hw);
931         struct ieee80211_tx_info *info = status->info;
932         struct ieee80211_sta *pubsta = status->sta;
933         struct ieee80211_supported_band *sband;
934         int retry_count;
935         bool acked, noack_success;
936
937         if (status->skb)
938                 return __ieee80211_tx_status(hw, status);
939
940         if (!status->sta)
941                 return;
942
943         ieee80211_tx_get_rates(hw, info, &retry_count);
944
945         sband = hw->wiphy->bands[info->band];
946
947         acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
948         noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
949
950         if (pubsta) {
951                 struct sta_info *sta;
952
953                 sta = container_of(pubsta, struct sta_info, sta);
954
955                 if (!acked)
956                         sta->status_stats.retry_failed++;
957                 sta->status_stats.retry_count += retry_count;
958
959                 if (acked) {
960                         sta->status_stats.last_ack = jiffies;
961
962                         if (sta->status_stats.lost_packets)
963                                 sta->status_stats.lost_packets = 0;
964
965                         /* Track when last TDLS packet was ACKed */
966                         if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
967                                 sta->status_stats.last_tdls_pkt_time = jiffies;
968                 } else {
969                         ieee80211_lost_packet(sta, info);
970                 }
971
972                 rate_control_tx_status(local, sband, status);
973         }
974
975         if (acked || noack_success) {
976                 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
977                 if (!pubsta)
978                         I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
979                 if (retry_count > 0)
980                         I802_DEBUG_INC(local->dot11RetryCount);
981                 if (retry_count > 1)
982                         I802_DEBUG_INC(local->dot11MultipleRetryCount);
983         } else {
984                 I802_DEBUG_INC(local->dot11FailedCount);
985         }
986 }
987 EXPORT_SYMBOL(ieee80211_tx_status_ext);
988
989 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
990 {
991         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
992         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
993                                     num_packets, GFP_ATOMIC);
994 }
995 EXPORT_SYMBOL(ieee80211_report_low_ack);
996
997 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
998 {
999         struct ieee80211_local *local = hw_to_local(hw);
1000
1001         ieee80211_report_used_skb(local, skb, true);
1002         dev_kfree_skb_any(skb);
1003 }
1004 EXPORT_SYMBOL(ieee80211_free_txskb);
1005
1006 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
1007                               struct sk_buff_head *skbs)
1008 {
1009         struct sk_buff *skb;
1010
1011         while ((skb = __skb_dequeue(skbs)))
1012                 ieee80211_free_txskb(hw, skb);
1013 }