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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
24void 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}
44EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
45
46static 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 = ieee802_1d_to_ac[tid & 7];
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
173static 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
185static 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
191 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
192 sta->status_stats.last_ack = jiffies;
193
194 if (ieee80211_is_data_qos(mgmt->frame_control)) {
195 struct ieee80211_hdr *hdr = (void *) skb->data;
196 u8 *qc = ieee80211_get_qos_ctl(hdr);
197 u16 tid = qc[0] & 0xf;
198
199 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
200 }
201
202 if (ieee80211_is_action(mgmt->frame_control) &&
203 mgmt->u.action.category == WLAN_CATEGORY_HT &&
204 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
205 ieee80211_sdata_running(sdata)) {
206 enum ieee80211_smps_mode smps_mode;
207
208 switch (mgmt->u.action.u.ht_smps.smps_control) {
209 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
210 smps_mode = IEEE80211_SMPS_DYNAMIC;
211 break;
212 case WLAN_HT_SMPS_CONTROL_STATIC:
213 smps_mode = IEEE80211_SMPS_STATIC;
214 break;
215 case WLAN_HT_SMPS_CONTROL_DISABLED:
216 default: /* shouldn't happen since we don't send that */
217 smps_mode = IEEE80211_SMPS_OFF;
218 break;
219 }
220
221 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
222 /*
223 * This update looks racy, but isn't -- if we come
224 * here we've definitely got a station that we're
225 * talking to, and on a managed interface that can
226 * only be the AP. And the only other place updating
227 * this variable in managed mode is before association.
228 */
229 sdata->smps_mode = smps_mode;
230 ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
231 } else if (sdata->vif.type == NL80211_IFTYPE_AP ||
232 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
233 sta->known_smps_mode = smps_mode;
234 }
235 }
236}
237
238static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
239{
240 struct tid_ampdu_tx *tid_tx;
241
242 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
243 if (!tid_tx)
244 return;
245
246 tid_tx->failed_bar_ssn = ssn;
247 tid_tx->bar_pending = true;
248}
249
250static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info)
251{
252 int len = sizeof(struct ieee80211_radiotap_header);
253
254 /* IEEE80211_RADIOTAP_RATE rate */
255 if (info->status.rates[0].idx >= 0 &&
256 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
257 IEEE80211_TX_RC_VHT_MCS)))
258 len += 2;
259
260 /* IEEE80211_RADIOTAP_TX_FLAGS */
261 len += 2;
262
263 /* IEEE80211_RADIOTAP_DATA_RETRIES */
264 len += 1;
265
266 /* IEEE80211_RADIOTAP_MCS
267 * IEEE80211_RADIOTAP_VHT */
268 if (info->status.rates[0].idx >= 0) {
269 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
270 len += 3;
271 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
272 len = ALIGN(len, 2) + 12;
273 }
274
275 return len;
276}
277
278static void
279ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
280 struct ieee80211_supported_band *sband,
281 struct sk_buff *skb, int retry_count,
282 int rtap_len, int shift)
283{
284 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
285 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
286 struct ieee80211_radiotap_header *rthdr;
287 unsigned char *pos;
288 u16 txflags;
289
290 rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len);
291
292 memset(rthdr, 0, rtap_len);
293 rthdr->it_len = cpu_to_le16(rtap_len);
294 rthdr->it_present =
295 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
296 (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
297 pos = (unsigned char *)(rthdr + 1);
298
299 /*
300 * XXX: Once radiotap gets the bitmap reset thing the vendor
301 * extensions proposal contains, we can actually report
302 * the whole set of tries we did.
303 */
304
305 /* IEEE80211_RADIOTAP_RATE */
306 if (info->status.rates[0].idx >= 0 &&
307 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
308 IEEE80211_TX_RC_VHT_MCS))) {
309 u16 rate;
310
311 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
312 rate = sband->bitrates[info->status.rates[0].idx].bitrate;
313 *pos = DIV_ROUND_UP(rate, 5 * (1 << shift));
314 /* padding for tx flags */
315 pos += 2;
316 }
317
318 /* IEEE80211_RADIOTAP_TX_FLAGS */
319 txflags = 0;
320 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
321 !is_multicast_ether_addr(hdr->addr1))
322 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
323
324 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
325 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
326 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
327 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
328
329 put_unaligned_le16(txflags, pos);
330 pos += 2;
331
332 /* IEEE80211_RADIOTAP_DATA_RETRIES */
333 /* for now report the total retry_count */
334 *pos = retry_count;
335 pos++;
336
337 if (info->status.rates[0].idx < 0)
338 return;
339
340 /* IEEE80211_RADIOTAP_MCS
341 * IEEE80211_RADIOTAP_VHT */
342 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
343 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
344 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
345 IEEE80211_RADIOTAP_MCS_HAVE_GI |
346 IEEE80211_RADIOTAP_MCS_HAVE_BW;
347 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
348 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
349 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
350 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
351 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
352 pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
353 pos[2] = info->status.rates[0].idx;
354 pos += 3;
355 } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
356 u16 known = local->hw.radiotap_vht_details &
357 (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
358 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
359
360 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
361
362 /* required alignment from rthdr */
363 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
364
365 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
366 put_unaligned_le16(known, pos);
367 pos += 2;
368
369 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
370 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
371 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
372 pos++;
373
374 /* u8 bandwidth */
375 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
376 *pos = 1;
377 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
378 *pos = 4;
379 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
380 *pos = 11;
381 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
382 *pos = 0;
383 pos++;
384
385 /* u8 mcs_nss[4] */
386 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
387 ieee80211_rate_get_vht_nss(&info->status.rates[0]);
388 pos += 4;
389
390 /* u8 coding */
391 pos++;
392 /* u8 group_id */
393 pos++;
394 /* u16 partial_aid */
395 pos += 2;
396 }
397}
398
399/*
400 * Handles the tx for TDLS teardown frames.
401 * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
402 */
403static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
404 struct ieee80211_sub_if_data *sdata,
405 struct sk_buff *skb, u32 flags)
406{
407 struct sk_buff *teardown_skb;
408 struct sk_buff *orig_teardown_skb;
409 bool is_teardown = false;
410
411 /* Get the teardown data we need and free the lock */
412 spin_lock(&sdata->u.mgd.teardown_lock);
413 teardown_skb = sdata->u.mgd.teardown_skb;
414 orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
415 if ((skb == orig_teardown_skb) && teardown_skb) {
416 sdata->u.mgd.teardown_skb = NULL;
417 sdata->u.mgd.orig_teardown_skb = NULL;
418 is_teardown = true;
419 }
420 spin_unlock(&sdata->u.mgd.teardown_lock);
421
422 if (is_teardown) {
423 /* This mechanism relies on being able to get ACKs */
424 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
425
426 /* Check if peer has ACKed */
427 if (flags & IEEE80211_TX_STAT_ACK) {
428 dev_kfree_skb_any(teardown_skb);
429 } else {
430 tdls_dbg(sdata,
431 "TDLS Resending teardown through AP\n");
432
433 ieee80211_subif_start_xmit(teardown_skb, skb->dev);
434 }
435 }
436}
437
438static struct ieee80211_sub_if_data *
439ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
440{
441 struct ieee80211_sub_if_data *sdata;
442
443 if (skb->dev) {
444 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
445 if (!sdata->dev)
446 continue;
447
448 if (skb->dev == sdata->dev)
449 return sdata;
450 }
451
452 return NULL;
453 }
454
455 return rcu_dereference(local->p2p_sdata);
456}
457
458static void ieee80211_report_ack_skb(struct ieee80211_local *local,
459 struct ieee80211_tx_info *info,
460 bool acked, bool dropped)
461{
462 struct sk_buff *skb;
463 unsigned long flags;
464
465 spin_lock_irqsave(&local->ack_status_lock, flags);
466 skb = idr_find(&local->ack_status_frames, info->ack_frame_id);
467 if (skb)
468 idr_remove(&local->ack_status_frames, info->ack_frame_id);
469 spin_unlock_irqrestore(&local->ack_status_lock, flags);
470
471 if (!skb)
472 return;
473
474 if (dropped) {
475 dev_kfree_skb_any(skb);
476 return;
477 }
478
479 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
480 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
481 struct ieee80211_sub_if_data *sdata;
482 struct ieee80211_hdr *hdr = (void *)skb->data;
483
484 rcu_read_lock();
485 sdata = ieee80211_sdata_from_skb(local, skb);
486 if (sdata) {
487 if (ieee80211_is_nullfunc(hdr->frame_control) ||
488 ieee80211_is_qos_nullfunc(hdr->frame_control))
489 cfg80211_probe_status(sdata->dev, hdr->addr1,
490 cookie, acked,
491 GFP_ATOMIC);
492 else
493 cfg80211_mgmt_tx_status(&sdata->wdev, cookie,
494 skb->data, skb->len,
495 acked, GFP_ATOMIC);
496 }
497 rcu_read_unlock();
498
499 dev_kfree_skb_any(skb);
500 } else {
501 /* consumes skb */
502 skb_complete_wifi_ack(skb, acked);
503 }
504}
505
506static void ieee80211_report_used_skb(struct ieee80211_local *local,
507 struct sk_buff *skb, bool dropped)
508{
509 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
510 struct ieee80211_hdr *hdr = (void *)skb->data;
511 bool acked = info->flags & IEEE80211_TX_STAT_ACK;
512
513 if (dropped)
514 acked = false;
515
516 if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
517 struct ieee80211_sub_if_data *sdata;
518
519 rcu_read_lock();
520
521 sdata = ieee80211_sdata_from_skb(local, skb);
522
523 if (!sdata) {
524 skb->dev = NULL;
525 } else {
526 unsigned int hdr_size =
527 ieee80211_hdrlen(hdr->frame_control);
528
529 /* Check to see if packet is a TDLS teardown packet */
530 if (ieee80211_is_data(hdr->frame_control) &&
531 (ieee80211_get_tdls_action(skb, hdr_size) ==
532 WLAN_TDLS_TEARDOWN))
533 ieee80211_tdls_td_tx_handle(local, sdata, skb,
534 info->flags);
535 else
536 ieee80211_mgd_conn_tx_status(sdata,
537 hdr->frame_control,
538 acked);
539 }
540
541 rcu_read_unlock();
542 } else if (info->ack_frame_id) {
543 ieee80211_report_ack_skb(local, info, acked, dropped);
544 }
545}
546
547/*
548 * Use a static threshold for now, best value to be determined
549 * by testing ...
550 * Should it depend on:
551 * - on # of retransmissions
552 * - current throughput (higher value for higher tpt)?
553 */
554#define STA_LOST_PKT_THRESHOLD 50
555#define STA_LOST_TDLS_PKT_THRESHOLD 10
556#define STA_LOST_TDLS_PKT_TIME (10*HZ) /* 10secs since last ACK */
557
558static void ieee80211_lost_packet(struct sta_info *sta,
559 struct ieee80211_tx_info *info)
560{
561 /* If driver relies on its own algorithm for station kickout, skip
562 * mac80211 packet loss mechanism.
563 */
564 if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
565 return;
566
567 /* This packet was aggregated but doesn't carry status info */
568 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
569 !(info->flags & IEEE80211_TX_STAT_AMPDU))
570 return;
571
572 sta->status_stats.lost_packets++;
573 if (!sta->sta.tdls &&
574 sta->status_stats.lost_packets < STA_LOST_PKT_THRESHOLD)
575 return;
576
577 /*
578 * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD
579 * of the last packets were lost, and that no ACK was received in the
580 * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
581 * mechanism.
582 */
583 if (sta->sta.tdls &&
584 (sta->status_stats.lost_packets < STA_LOST_TDLS_PKT_THRESHOLD ||
585 time_before(jiffies,
586 sta->status_stats.last_tdls_pkt_time +
587 STA_LOST_TDLS_PKT_TIME)))
588 return;
589
590 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
591 sta->status_stats.lost_packets, GFP_ATOMIC);
592 sta->status_stats.lost_packets = 0;
593}
594
595static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
596 struct ieee80211_tx_info *info,
597 int *retry_count)
598{
599 int rates_idx = -1;
600 int count = -1;
601 int i;
602
603 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
604 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
605 !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
606 /* just the first aggr frame carry status info */
607 info->status.rates[i].idx = -1;
608 info->status.rates[i].count = 0;
609 break;
610 } else if (info->status.rates[i].idx < 0) {
611 break;
612 } else if (i >= hw->max_report_rates) {
613 /* the HW cannot have attempted that rate */
614 info->status.rates[i].idx = -1;
615 info->status.rates[i].count = 0;
616 break;
617 }
618
619 count += info->status.rates[i].count;
620 }
621 rates_idx = i - 1;
622
623 if (count < 0)
624 count = 0;
625
626 *retry_count = count;
627 return rates_idx;
628}
629
630void ieee80211_tx_status_noskb(struct ieee80211_hw *hw,
631 struct ieee80211_sta *pubsta,
632 struct ieee80211_tx_info *info)
633{
634 struct ieee80211_local *local = hw_to_local(hw);
635 struct ieee80211_supported_band *sband;
636 int retry_count;
637 int rates_idx;
638 bool acked, noack_success;
639
640 rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
641
642 sband = hw->wiphy->bands[info->band];
643
644 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
645 noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
646
647 if (pubsta) {
648 struct sta_info *sta;
649
650 sta = container_of(pubsta, struct sta_info, sta);
651
652 if (!acked)
653 sta->status_stats.retry_failed++;
654 sta->status_stats.retry_count += retry_count;
655
656 if (acked) {
657 sta->status_stats.last_ack = jiffies;
658
659 if (sta->status_stats.lost_packets)
660 sta->status_stats.lost_packets = 0;
661
662 /* Track when last TDLS packet was ACKed */
663 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
664 sta->status_stats.last_tdls_pkt_time = jiffies;
665 } else {
666 ieee80211_lost_packet(sta, info);
667 }
668
669 rate_control_tx_status_noskb(local, sband, sta, info);
670 }
671
672 if (acked || noack_success) {
673 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
674 if (!pubsta)
675 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
676 if (retry_count > 0)
677 I802_DEBUG_INC(local->dot11RetryCount);
678 if (retry_count > 1)
679 I802_DEBUG_INC(local->dot11MultipleRetryCount);
680 } else {
681 I802_DEBUG_INC(local->dot11FailedCount);
682 }
683}
684EXPORT_SYMBOL(ieee80211_tx_status_noskb);
685
686void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
687 struct ieee80211_supported_band *sband,
688 int retry_count, int shift, bool send_to_cooked)
689{
690 struct sk_buff *skb2;
691 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
692 struct ieee80211_sub_if_data *sdata;
693 struct net_device *prev_dev = NULL;
694 int rtap_len;
695
696 /* send frame to monitor interfaces now */
697 rtap_len = ieee80211_tx_radiotap_len(info);
698 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
699 pr_err("ieee80211_tx_status: headroom too small\n");
700 dev_kfree_skb(skb);
701 return;
702 }
703 ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
704 rtap_len, shift);
705
706 /* XXX: is this sufficient for BPF? */
707 skb_reset_mac_header(skb);
708 skb->ip_summed = CHECKSUM_UNNECESSARY;
709 skb->pkt_type = PACKET_OTHERHOST;
710 skb->protocol = htons(ETH_P_802_2);
711 memset(skb->cb, 0, sizeof(skb->cb));
712
713 rcu_read_lock();
714 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
715 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
716 if (!ieee80211_sdata_running(sdata))
717 continue;
718
719 if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
720 !send_to_cooked)
721 continue;
722
723 if (prev_dev) {
724 skb2 = skb_clone(skb, GFP_ATOMIC);
725 if (skb2) {
726 skb2->dev = prev_dev;
727 netif_rx(skb2);
728 }
729 }
730
731 prev_dev = sdata->dev;
732 }
733 }
734 if (prev_dev) {
735 skb->dev = prev_dev;
736 netif_rx(skb);
737 skb = NULL;
738 }
739 rcu_read_unlock();
740 dev_kfree_skb(skb);
741}
742
743void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
744{
745 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
746 struct ieee80211_local *local = hw_to_local(hw);
747 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
748 __le16 fc;
749 struct ieee80211_supported_band *sband;
750 struct rhlist_head *tmp;
751 struct sta_info *sta;
752 int retry_count;
753 int rates_idx;
754 bool send_to_cooked;
755 bool acked;
756 struct ieee80211_bar *bar;
757 int shift = 0;
758 int tid = IEEE80211_NUM_TIDS;
759
760 rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
761
762 rcu_read_lock();
763
764 sband = local->hw.wiphy->bands[info->band];
765 fc = hdr->frame_control;
766
767 for_each_sta_info(local, hdr->addr1, sta, tmp) {
768 /* skip wrong virtual interface */
769 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr))
770 continue;
771
772 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
773
774 if (info->flags & IEEE80211_TX_STATUS_EOSP)
775 clear_sta_flag(sta, WLAN_STA_SP);
776
777 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
778
779 /* mesh Peer Service Period support */
780 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
781 ieee80211_is_data_qos(fc))
782 ieee80211_mpsp_trigger_process(
783 ieee80211_get_qos_ctl(hdr), sta, true, acked);
784
785 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
786 /*
787 * The STA is in power save mode, so assume
788 * that this TX packet failed because of that.
789 */
790 ieee80211_handle_filtered_frame(local, sta, skb);
791 rcu_read_unlock();
792 return;
793 }
794
795 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
796 (ieee80211_is_data(hdr->frame_control)) &&
797 (rates_idx != -1))
798 sta->tx_stats.last_rate =
799 info->status.rates[rates_idx];
800
801 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
802 (ieee80211_is_data_qos(fc))) {
803 u16 ssn;
804 u8 *qc;
805
806 qc = ieee80211_get_qos_ctl(hdr);
807 tid = qc[0] & 0xf;
808 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
809 & IEEE80211_SCTL_SEQ);
810 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
811 tid, ssn);
812 } else if (ieee80211_is_data_qos(fc)) {
813 u8 *qc = ieee80211_get_qos_ctl(hdr);
814
815 tid = qc[0] & 0xf;
816 }
817
818 if (!acked && ieee80211_is_back_req(fc)) {
819 u16 control;
820
821 /*
822 * BAR failed, store the last SSN and retry sending
823 * the BAR when the next unicast transmission on the
824 * same TID succeeds.
825 */
826 bar = (struct ieee80211_bar *) skb->data;
827 control = le16_to_cpu(bar->control);
828 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
829 u16 ssn = le16_to_cpu(bar->start_seq_num);
830
831 tid = (control &
832 IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
833 IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
834
835 ieee80211_set_bar_pending(sta, tid, ssn);
836 }
837 }
838
839 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
840 ieee80211_handle_filtered_frame(local, sta, skb);
841 rcu_read_unlock();
842 return;
843 } else {
844 if (!acked)
845 sta->status_stats.retry_failed++;
846 sta->status_stats.retry_count += retry_count;
847
848 if (ieee80211_is_data_present(fc)) {
849 if (!acked)
850 sta->status_stats.msdu_failed[tid]++;
851
852 sta->status_stats.msdu_retries[tid] +=
853 retry_count;
854 }
855 }
856
857 rate_control_tx_status(local, sband, sta, skb);
858 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
859 ieee80211s_update_metric(local, sta, skb);
860
861 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
862 ieee80211_frame_acked(sta, skb);
863
864 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
865 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
866 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data,
867 acked, info->status.tx_time);
868
869 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
870 if (info->flags & IEEE80211_TX_STAT_ACK) {
871 if (sta->status_stats.lost_packets)
872 sta->status_stats.lost_packets = 0;
873
874 /* Track when last TDLS packet was ACKed */
875 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
876 sta->status_stats.last_tdls_pkt_time =
877 jiffies;
878 } else {
879 ieee80211_lost_packet(sta, info);
880 }
881 }
882 }
883
884 rcu_read_unlock();
885
886 ieee80211_led_tx(local);
887
888 /* SNMP counters
889 * Fragments are passed to low-level drivers as separate skbs, so these
890 * are actually fragments, not frames. Update frame counters only for
891 * the first fragment of the frame. */
892 if ((info->flags & IEEE80211_TX_STAT_ACK) ||
893 (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
894 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
895 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
896 if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
897 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
898 if (retry_count > 0)
899 I802_DEBUG_INC(local->dot11RetryCount);
900 if (retry_count > 1)
901 I802_DEBUG_INC(local->dot11MultipleRetryCount);
902 }
903
904 /* This counter shall be incremented for an acknowledged MPDU
905 * with an individual address in the address 1 field or an MPDU
906 * with a multicast address in the address 1 field of type Data
907 * or Management. */
908 if (!is_multicast_ether_addr(hdr->addr1) ||
909 ieee80211_is_data(fc) ||
910 ieee80211_is_mgmt(fc))
911 I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
912 } else {
913 if (ieee80211_is_first_frag(hdr->seq_ctrl))
914 I802_DEBUG_INC(local->dot11FailedCount);
915 }
916
917 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
918 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
919 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
920 local->ps_sdata && !(local->scanning)) {
921 if (info->flags & IEEE80211_TX_STAT_ACK) {
922 local->ps_sdata->u.mgd.flags |=
923 IEEE80211_STA_NULLFUNC_ACKED;
924 } else
925 mod_timer(&local->dynamic_ps_timer, jiffies +
926 msecs_to_jiffies(10));
927 }
928
929 ieee80211_report_used_skb(local, skb, false);
930
931 /* this was a transmitted frame, but now we want to reuse it */
932 skb_orphan(skb);
933
934 /* Need to make a copy before skb->cb gets cleared */
935 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
936 !(ieee80211_is_data(fc));
937
938 /*
939 * This is a bit racy but we can avoid a lot of work
940 * with this test...
941 */
942 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
943 dev_kfree_skb(skb);
944 return;
945 }
946
947 /* send to monitor interfaces */
948 ieee80211_tx_monitor(local, skb, sband, retry_count, shift, send_to_cooked);
949}
950EXPORT_SYMBOL(ieee80211_tx_status);
951
952void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
953{
954 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
955 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
956 num_packets, GFP_ATOMIC);
957}
958EXPORT_SYMBOL(ieee80211_report_low_ack);
959
960void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
961{
962 struct ieee80211_local *local = hw_to_local(hw);
963
964 ieee80211_report_used_skb(local, skb, true);
965 dev_kfree_skb_any(skb);
966}
967EXPORT_SYMBOL(ieee80211_free_txskb);
968
969void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
970 struct sk_buff_head *skbs)
971{
972 struct sk_buff *skb;
973
974 while ((skb = __skb_dequeue(skbs)))
975 ieee80211_free_txskb(hw, skb);
976}
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
24void 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}
44EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
45
46static 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
172static 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
184static 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
237static 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
249static 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
277static void
278ieee80211_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 */
402static 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
437static struct ieee80211_sub_if_data *
438ieee80211_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
457static 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
505static 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
557static 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
588static 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
623void 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}
677EXPORT_SYMBOL(ieee80211_tx_status_noskb);
678
679void 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
736void 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}
946EXPORT_SYMBOL(ieee80211_tx_status);
947
948void 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}
954EXPORT_SYMBOL(ieee80211_report_low_ack);
955
956void 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}
963EXPORT_SYMBOL(ieee80211_free_txskb);
964
965void 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}