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1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2008-2010 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/export.h>
14 #include <linux/etherdevice.h>
15 #include <net/mac80211.h>
16 #include <asm/unaligned.h>
17 #include "ieee80211_i.h"
18 #include "rate.h"
19 #include "mesh.h"
20 #include "led.h"
21 #include "wme.h"
22
23
24 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
25 struct sk_buff *skb)
26 {
27 struct ieee80211_local *local = hw_to_local(hw);
28 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
29 int tmp;
30
31 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
32 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
33 &local->skb_queue : &local->skb_queue_unreliable, skb);
34 tmp = skb_queue_len(&local->skb_queue) +
35 skb_queue_len(&local->skb_queue_unreliable);
36 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
37 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
38 ieee80211_free_txskb(hw, skb);
39 tmp--;
40 I802_DEBUG_INC(local->tx_status_drop);
41 }
42 tasklet_schedule(&local->tasklet);
43 }
44 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
45
46 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
47 struct sta_info *sta,
48 struct sk_buff *skb)
49 {
50 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
51 struct ieee80211_hdr *hdr = (void *)skb->data;
52 int ac;
53
54 if (info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER |
55 IEEE80211_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
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 !ieee80211_has_protected(mgmt->frame_control) &&
204 mgmt->u.action.category == WLAN_CATEGORY_HT &&
205 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
206 ieee80211_sdata_running(sdata)) {
207 enum ieee80211_smps_mode smps_mode;
208
209 switch (mgmt->u.action.u.ht_smps.smps_control) {
210 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
211 smps_mode = IEEE80211_SMPS_DYNAMIC;
212 break;
213 case WLAN_HT_SMPS_CONTROL_STATIC:
214 smps_mode = IEEE80211_SMPS_STATIC;
215 break;
216 case WLAN_HT_SMPS_CONTROL_DISABLED:
217 default: /* shouldn't happen since we don't send that */
218 smps_mode = IEEE80211_SMPS_OFF;
219 break;
220 }
221
222 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
223 /*
224 * This update looks racy, but isn't -- if we come
225 * here we've definitely got a station that we're
226 * talking to, and on a managed interface that can
227 * only be the AP. And the only other place updating
228 * this variable in managed mode is before association.
229 */
230 sdata->smps_mode = smps_mode;
231 ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
232 } else if (sdata->vif.type == NL80211_IFTYPE_AP ||
233 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
234 sta->known_smps_mode = smps_mode;
235 }
236 }
237 }
238
239 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
240 {
241 struct tid_ampdu_tx *tid_tx;
242
243 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
244 if (!tid_tx)
245 return;
246
247 tid_tx->failed_bar_ssn = ssn;
248 tid_tx->bar_pending = true;
249 }
250
251 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info)
252 {
253 int len = sizeof(struct ieee80211_radiotap_header);
254
255 /* IEEE80211_RADIOTAP_RATE rate */
256 if (info->status.rates[0].idx >= 0 &&
257 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
258 IEEE80211_TX_RC_VHT_MCS)))
259 len += 2;
260
261 /* IEEE80211_RADIOTAP_TX_FLAGS */
262 len += 2;
263
264 /* IEEE80211_RADIOTAP_DATA_RETRIES */
265 len += 1;
266
267 /* IEEE80211_RADIOTAP_MCS
268 * IEEE80211_RADIOTAP_VHT */
269 if (info->status.rates[0].idx >= 0) {
270 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
271 len += 3;
272 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
273 len = ALIGN(len, 2) + 12;
274 }
275
276 return len;
277 }
278
279 static void
280 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
281 struct ieee80211_supported_band *sband,
282 struct sk_buff *skb, int retry_count,
283 int rtap_len, int shift)
284 {
285 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
286 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
287 struct ieee80211_radiotap_header *rthdr;
288 unsigned char *pos;
289 u16 txflags;
290
291 rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len);
292
293 memset(rthdr, 0, rtap_len);
294 rthdr->it_len = cpu_to_le16(rtap_len);
295 rthdr->it_present =
296 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
297 (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
298 pos = (unsigned char *)(rthdr + 1);
299
300 /*
301 * XXX: Once radiotap gets the bitmap reset thing the vendor
302 * extensions proposal contains, we can actually report
303 * the whole set of tries we did.
304 */
305
306 /* IEEE80211_RADIOTAP_RATE */
307 if (info->status.rates[0].idx >= 0 &&
308 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
309 IEEE80211_TX_RC_VHT_MCS))) {
310 u16 rate;
311
312 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
313 rate = sband->bitrates[info->status.rates[0].idx].bitrate;
314 *pos = DIV_ROUND_UP(rate, 5 * (1 << shift));
315 /* padding for tx flags */
316 pos += 2;
317 }
318
319 /* IEEE80211_RADIOTAP_TX_FLAGS */
320 txflags = 0;
321 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
322 !is_multicast_ether_addr(hdr->addr1))
323 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
324
325 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
326 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
327 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
328 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
329
330 put_unaligned_le16(txflags, pos);
331 pos += 2;
332
333 /* IEEE80211_RADIOTAP_DATA_RETRIES */
334 /* for now report the total retry_count */
335 *pos = retry_count;
336 pos++;
337
338 if (info->status.rates[0].idx < 0)
339 return;
340
341 /* IEEE80211_RADIOTAP_MCS
342 * IEEE80211_RADIOTAP_VHT */
343 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
344 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
345 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
346 IEEE80211_RADIOTAP_MCS_HAVE_GI |
347 IEEE80211_RADIOTAP_MCS_HAVE_BW;
348 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
349 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
350 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
351 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
352 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
353 pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
354 pos[2] = info->status.rates[0].idx;
355 pos += 3;
356 } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
357 u16 known = local->hw.radiotap_vht_details &
358 (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
359 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
360
361 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
362
363 /* required alignment from rthdr */
364 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
365
366 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
367 put_unaligned_le16(known, pos);
368 pos += 2;
369
370 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
371 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
372 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
373 pos++;
374
375 /* u8 bandwidth */
376 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
377 *pos = 1;
378 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
379 *pos = 4;
380 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
381 *pos = 11;
382 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
383 *pos = 0;
384 pos++;
385
386 /* u8 mcs_nss[4] */
387 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
388 ieee80211_rate_get_vht_nss(&info->status.rates[0]);
389 pos += 4;
390
391 /* u8 coding */
392 pos++;
393 /* u8 group_id */
394 pos++;
395 /* u16 partial_aid */
396 pos += 2;
397 }
398 }
399
400 /*
401 * Handles the tx for TDLS teardown frames.
402 * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
403 */
404 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
405 struct ieee80211_sub_if_data *sdata,
406 struct sk_buff *skb, u32 flags)
407 {
408 struct sk_buff *teardown_skb;
409 struct sk_buff *orig_teardown_skb;
410 bool is_teardown = false;
411
412 /* Get the teardown data we need and free the lock */
413 spin_lock(&sdata->u.mgd.teardown_lock);
414 teardown_skb = sdata->u.mgd.teardown_skb;
415 orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
416 if ((skb == orig_teardown_skb) && teardown_skb) {
417 sdata->u.mgd.teardown_skb = NULL;
418 sdata->u.mgd.orig_teardown_skb = NULL;
419 is_teardown = true;
420 }
421 spin_unlock(&sdata->u.mgd.teardown_lock);
422
423 if (is_teardown) {
424 /* This mechanism relies on being able to get ACKs */
425 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
426
427 /* Check if peer has ACKed */
428 if (flags & IEEE80211_TX_STAT_ACK) {
429 dev_kfree_skb_any(teardown_skb);
430 } else {
431 tdls_dbg(sdata,
432 "TDLS Resending teardown through AP\n");
433
434 ieee80211_subif_start_xmit(teardown_skb, skb->dev);
435 }
436 }
437 }
438
439 static struct ieee80211_sub_if_data *
440 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
441 {
442 struct ieee80211_sub_if_data *sdata;
443
444 if (skb->dev) {
445 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
446 if (!sdata->dev)
447 continue;
448
449 if (skb->dev == sdata->dev)
450 return sdata;
451 }
452
453 return NULL;
454 }
455
456 return rcu_dereference(local->p2p_sdata);
457 }
458
459 static void ieee80211_report_ack_skb(struct ieee80211_local *local,
460 struct ieee80211_tx_info *info,
461 bool acked, bool dropped)
462 {
463 struct sk_buff *skb;
464 unsigned long flags;
465
466 spin_lock_irqsave(&local->ack_status_lock, flags);
467 skb = idr_remove(&local->ack_status_frames, info->ack_frame_id);
468 spin_unlock_irqrestore(&local->ack_status_lock, flags);
469
470 if (!skb)
471 return;
472
473 if (dropped) {
474 dev_kfree_skb_any(skb);
475 return;
476 }
477
478 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
479 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
480 struct ieee80211_sub_if_data *sdata;
481 struct ieee80211_hdr *hdr = (void *)skb->data;
482
483 rcu_read_lock();
484 sdata = ieee80211_sdata_from_skb(local, skb);
485 if (sdata) {
486 if (ieee80211_is_nullfunc(hdr->frame_control) ||
487 ieee80211_is_qos_nullfunc(hdr->frame_control))
488 cfg80211_probe_status(sdata->dev, hdr->addr1,
489 cookie, acked,
490 GFP_ATOMIC);
491 else
492 cfg80211_mgmt_tx_status(&sdata->wdev, cookie,
493 skb->data, skb->len,
494 acked, GFP_ATOMIC);
495 }
496 rcu_read_unlock();
497
498 dev_kfree_skb_any(skb);
499 } else {
500 /* consumes skb */
501 skb_complete_wifi_ack(skb, acked);
502 }
503 }
504
505 static void ieee80211_report_used_skb(struct ieee80211_local *local,
506 struct sk_buff *skb, bool dropped)
507 {
508 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
509 struct ieee80211_hdr *hdr = (void *)skb->data;
510 bool acked = info->flags & IEEE80211_TX_STAT_ACK;
511
512 if (dropped)
513 acked = false;
514
515 if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
516 struct ieee80211_sub_if_data *sdata;
517
518 rcu_read_lock();
519
520 sdata = ieee80211_sdata_from_skb(local, skb);
521
522 if (!sdata) {
523 skb->dev = NULL;
524 } else {
525 unsigned int hdr_size =
526 ieee80211_hdrlen(hdr->frame_control);
527
528 /* Check to see if packet is a TDLS teardown packet */
529 if (ieee80211_is_data(hdr->frame_control) &&
530 (ieee80211_get_tdls_action(skb, hdr_size) ==
531 WLAN_TDLS_TEARDOWN))
532 ieee80211_tdls_td_tx_handle(local, sdata, skb,
533 info->flags);
534 else
535 ieee80211_mgd_conn_tx_status(sdata,
536 hdr->frame_control,
537 acked);
538 }
539
540 rcu_read_unlock();
541 } else if (info->ack_frame_id) {
542 ieee80211_report_ack_skb(local, info, acked, dropped);
543 }
544
545 if (!dropped && skb->destructor) {
546 skb->wifi_acked_valid = 1;
547 skb->wifi_acked = acked;
548 }
549 }
550
551 /*
552 * Use a static threshold for now, best value to be determined
553 * by testing ...
554 * Should it depend on:
555 * - on # of retransmissions
556 * - current throughput (higher value for higher tpt)?
557 */
558 #define STA_LOST_PKT_THRESHOLD 50
559 #define STA_LOST_TDLS_PKT_THRESHOLD 10
560 #define STA_LOST_TDLS_PKT_TIME (10*HZ) /* 10secs since last ACK */
561
562 static void ieee80211_lost_packet(struct sta_info *sta,
563 struct ieee80211_tx_info *info)
564 {
565 /* If driver relies on its own algorithm for station kickout, skip
566 * mac80211 packet loss mechanism.
567 */
568 if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
569 return;
570
571 /* This packet was aggregated but doesn't carry status info */
572 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
573 !(info->flags & IEEE80211_TX_STAT_AMPDU))
574 return;
575
576 sta->status_stats.lost_packets++;
577 if (!sta->sta.tdls &&
578 sta->status_stats.lost_packets < STA_LOST_PKT_THRESHOLD)
579 return;
580
581 /*
582 * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD
583 * of the last packets were lost, and that no ACK was received in the
584 * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
585 * mechanism.
586 */
587 if (sta->sta.tdls &&
588 (sta->status_stats.lost_packets < STA_LOST_TDLS_PKT_THRESHOLD ||
589 time_before(jiffies,
590 sta->status_stats.last_tdls_pkt_time +
591 STA_LOST_TDLS_PKT_TIME)))
592 return;
593
594 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
595 sta->status_stats.lost_packets, GFP_ATOMIC);
596 sta->status_stats.lost_packets = 0;
597 }
598
599 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
600 struct ieee80211_tx_info *info,
601 int *retry_count)
602 {
603 int rates_idx = -1;
604 int count = -1;
605 int i;
606
607 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
608 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
609 !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
610 /* just the first aggr frame carry status info */
611 info->status.rates[i].idx = -1;
612 info->status.rates[i].count = 0;
613 break;
614 } else if (info->status.rates[i].idx < 0) {
615 break;
616 } else if (i >= hw->max_report_rates) {
617 /* the HW cannot have attempted that rate */
618 info->status.rates[i].idx = -1;
619 info->status.rates[i].count = 0;
620 break;
621 }
622
623 count += info->status.rates[i].count;
624 }
625 rates_idx = i - 1;
626
627 if (count < 0)
628 count = 0;
629
630 *retry_count = count;
631 return rates_idx;
632 }
633
634 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
635 struct ieee80211_supported_band *sband,
636 int retry_count, int shift, bool send_to_cooked)
637 {
638 struct sk_buff *skb2;
639 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
640 struct ieee80211_sub_if_data *sdata;
641 struct net_device *prev_dev = NULL;
642 int rtap_len;
643
644 /* send frame to monitor interfaces now */
645 rtap_len = ieee80211_tx_radiotap_len(info);
646 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
647 pr_err("ieee80211_tx_status: headroom too small\n");
648 dev_kfree_skb(skb);
649 return;
650 }
651 ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
652 rtap_len, shift);
653
654 /* XXX: is this sufficient for BPF? */
655 skb_reset_mac_header(skb);
656 skb->ip_summed = CHECKSUM_UNNECESSARY;
657 skb->pkt_type = PACKET_OTHERHOST;
658 skb->protocol = htons(ETH_P_802_2);
659 memset(skb->cb, 0, sizeof(skb->cb));
660
661 rcu_read_lock();
662 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
663 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
664 if (!ieee80211_sdata_running(sdata))
665 continue;
666
667 if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
668 !send_to_cooked)
669 continue;
670
671 if (prev_dev) {
672 skb2 = skb_clone(skb, GFP_ATOMIC);
673 if (skb2) {
674 skb2->dev = prev_dev;
675 netif_rx(skb2);
676 }
677 }
678
679 prev_dev = sdata->dev;
680 }
681 }
682 if (prev_dev) {
683 skb->dev = prev_dev;
684 netif_rx(skb);
685 skb = NULL;
686 }
687 rcu_read_unlock();
688 dev_kfree_skb(skb);
689 }
690
691 static void __ieee80211_tx_status(struct ieee80211_hw *hw,
692 struct ieee80211_tx_status *status)
693 {
694 struct sk_buff *skb = status->skb;
695 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
696 struct ieee80211_local *local = hw_to_local(hw);
697 struct ieee80211_tx_info *info = status->info;
698 struct sta_info *sta;
699 __le16 fc;
700 struct ieee80211_supported_band *sband;
701 int retry_count;
702 int rates_idx;
703 bool send_to_cooked;
704 bool acked;
705 struct ieee80211_bar *bar;
706 int shift = 0;
707 int tid = IEEE80211_NUM_TIDS;
708
709 rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
710
711 sband = local->hw.wiphy->bands[info->band];
712 fc = hdr->frame_control;
713
714 if (status->sta) {
715 sta = container_of(status->sta, struct sta_info, sta);
716 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
717
718 if (info->flags & IEEE80211_TX_STATUS_EOSP)
719 clear_sta_flag(sta, WLAN_STA_SP);
720
721 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
722
723 /* mesh Peer Service Period support */
724 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
725 ieee80211_is_data_qos(fc))
726 ieee80211_mpsp_trigger_process(
727 ieee80211_get_qos_ctl(hdr), sta, true, acked);
728
729 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
730 /*
731 * The STA is in power save mode, so assume
732 * that this TX packet failed because of that.
733 */
734 ieee80211_handle_filtered_frame(local, sta, skb);
735 return;
736 }
737
738 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
739 (ieee80211_is_data(hdr->frame_control)) &&
740 (rates_idx != -1))
741 sta->tx_stats.last_rate =
742 info->status.rates[rates_idx];
743
744 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
745 (ieee80211_is_data_qos(fc))) {
746 u16 ssn;
747 u8 *qc;
748
749 qc = ieee80211_get_qos_ctl(hdr);
750 tid = qc[0] & 0xf;
751 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
752 & IEEE80211_SCTL_SEQ);
753 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
754 tid, ssn);
755 } else if (ieee80211_is_data_qos(fc)) {
756 u8 *qc = ieee80211_get_qos_ctl(hdr);
757
758 tid = qc[0] & 0xf;
759 }
760
761 if (!acked && ieee80211_is_back_req(fc)) {
762 u16 control;
763
764 /*
765 * BAR failed, store the last SSN and retry sending
766 * the BAR when the next unicast transmission on the
767 * same TID succeeds.
768 */
769 bar = (struct ieee80211_bar *) skb->data;
770 control = le16_to_cpu(bar->control);
771 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
772 u16 ssn = le16_to_cpu(bar->start_seq_num);
773
774 tid = (control &
775 IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
776 IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
777
778 ieee80211_set_bar_pending(sta, tid, ssn);
779 }
780 }
781
782 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
783 ieee80211_handle_filtered_frame(local, sta, skb);
784 return;
785 } else {
786 if (!acked)
787 sta->status_stats.retry_failed++;
788 sta->status_stats.retry_count += retry_count;
789
790 if (ieee80211_is_data_present(fc)) {
791 if (!acked)
792 sta->status_stats.msdu_failed[tid]++;
793
794 sta->status_stats.msdu_retries[tid] +=
795 retry_count;
796 }
797 }
798
799 rate_control_tx_status(local, sband, status);
800 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
801 ieee80211s_update_metric(local, sta, skb);
802
803 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
804 ieee80211_frame_acked(sta, skb);
805
806 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
807 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
808 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data,
809 acked, info->status.tx_time);
810
811 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
812 if (info->flags & IEEE80211_TX_STAT_ACK) {
813 if (sta->status_stats.lost_packets)
814 sta->status_stats.lost_packets = 0;
815
816 /* Track when last TDLS packet was ACKed */
817 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
818 sta->status_stats.last_tdls_pkt_time =
819 jiffies;
820 } else {
821 ieee80211_lost_packet(sta, info);
822 }
823 }
824 }
825
826 ieee80211_led_tx(local);
827
828 /* SNMP counters
829 * Fragments are passed to low-level drivers as separate skbs, so these
830 * are actually fragments, not frames. Update frame counters only for
831 * the first fragment of the frame. */
832 if ((info->flags & IEEE80211_TX_STAT_ACK) ||
833 (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
834 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
835 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
836 if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
837 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
838 if (retry_count > 0)
839 I802_DEBUG_INC(local->dot11RetryCount);
840 if (retry_count > 1)
841 I802_DEBUG_INC(local->dot11MultipleRetryCount);
842 }
843
844 /* This counter shall be incremented for an acknowledged MPDU
845 * with an individual address in the address 1 field or an MPDU
846 * with a multicast address in the address 1 field of type Data
847 * or Management. */
848 if (!is_multicast_ether_addr(hdr->addr1) ||
849 ieee80211_is_data(fc) ||
850 ieee80211_is_mgmt(fc))
851 I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
852 } else {
853 if (ieee80211_is_first_frag(hdr->seq_ctrl))
854 I802_DEBUG_INC(local->dot11FailedCount);
855 }
856
857 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
858 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
859 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
860 local->ps_sdata && !(local->scanning)) {
861 if (info->flags & IEEE80211_TX_STAT_ACK) {
862 local->ps_sdata->u.mgd.flags |=
863 IEEE80211_STA_NULLFUNC_ACKED;
864 } else
865 mod_timer(&local->dynamic_ps_timer, jiffies +
866 msecs_to_jiffies(10));
867 }
868
869 ieee80211_report_used_skb(local, skb, false);
870
871 /* this was a transmitted frame, but now we want to reuse it */
872 skb_orphan(skb);
873
874 /* Need to make a copy before skb->cb gets cleared */
875 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
876 !(ieee80211_is_data(fc));
877
878 /*
879 * This is a bit racy but we can avoid a lot of work
880 * with this test...
881 */
882 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
883 dev_kfree_skb(skb);
884 return;
885 }
886
887 /* send to monitor interfaces */
888 ieee80211_tx_monitor(local, skb, sband, retry_count, shift, send_to_cooked);
889 }
890
891 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
892 {
893 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
894 struct ieee80211_local *local = hw_to_local(hw);
895 struct ieee80211_tx_status status = {
896 .skb = skb,
897 .info = IEEE80211_SKB_CB(skb),
898 };
899 struct rhlist_head *tmp;
900 struct sta_info *sta;
901
902 rcu_read_lock();
903
904 for_each_sta_info(local, hdr->addr1, sta, tmp) {
905 /* skip wrong virtual interface */
906 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr))
907 continue;
908
909 status.sta = &sta->sta;
910 break;
911 }
912
913 __ieee80211_tx_status(hw, &status);
914 rcu_read_unlock();
915 }
916 EXPORT_SYMBOL(ieee80211_tx_status);
917
918 void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
919 struct ieee80211_tx_status *status)
920 {
921 struct ieee80211_local *local = hw_to_local(hw);
922 struct ieee80211_tx_info *info = status->info;
923 struct ieee80211_sta *pubsta = status->sta;
924 struct ieee80211_supported_band *sband;
925 int retry_count;
926 bool acked, noack_success;
927
928 if (status->skb)
929 return __ieee80211_tx_status(hw, status);
930
931 if (!status->sta)
932 return;
933
934 ieee80211_tx_get_rates(hw, info, &retry_count);
935
936 sband = hw->wiphy->bands[info->band];
937
938 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
939 noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
940
941 if (pubsta) {
942 struct sta_info *sta;
943
944 sta = container_of(pubsta, struct sta_info, sta);
945
946 if (!acked)
947 sta->status_stats.retry_failed++;
948 sta->status_stats.retry_count += retry_count;
949
950 if (acked) {
951 sta->status_stats.last_ack = jiffies;
952
953 if (sta->status_stats.lost_packets)
954 sta->status_stats.lost_packets = 0;
955
956 /* Track when last TDLS packet was ACKed */
957 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
958 sta->status_stats.last_tdls_pkt_time = jiffies;
959 } else {
960 ieee80211_lost_packet(sta, info);
961 }
962
963 rate_control_tx_status(local, sband, status);
964 }
965
966 if (acked || noack_success) {
967 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
968 if (!pubsta)
969 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
970 if (retry_count > 0)
971 I802_DEBUG_INC(local->dot11RetryCount);
972 if (retry_count > 1)
973 I802_DEBUG_INC(local->dot11MultipleRetryCount);
974 } else {
975 I802_DEBUG_INC(local->dot11FailedCount);
976 }
977 }
978 EXPORT_SYMBOL(ieee80211_tx_status_ext);
979
980 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
981 {
982 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
983 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
984 num_packets, GFP_ATOMIC);
985 }
986 EXPORT_SYMBOL(ieee80211_report_low_ack);
987
988 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
989 {
990 struct ieee80211_local *local = hw_to_local(hw);
991
992 ieee80211_report_used_skb(local, skb, true);
993 dev_kfree_skb_any(skb);
994 }
995 EXPORT_SYMBOL(ieee80211_free_txskb);
996
997 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
998 struct sk_buff_head *skbs)
999 {
1000 struct sk_buff *skb;
1001
1002 while ((skb = __skb_dequeue(skbs)))
1003 ieee80211_free_txskb(hw, skb);
1004 }