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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2002-2005, Instant802 Networks, Inc.
4 * Copyright 2005-2006, Devicescape Software, Inc.
5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
6 * Copyright 2008-2010 Johannes Berg <johannes@sipsolutions.net>
7 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * Copyright 2021-2024 Intel Corporation
9 */
10
11#include <linux/export.h>
12#include <linux/etherdevice.h>
13#include <net/mac80211.h>
14#include <linux/unaligned.h>
15#include "ieee80211_i.h"
16#include "rate.h"
17#include "mesh.h"
18#include "led.h"
19#include "wme.h"
20
21
22void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
23 struct sk_buff *skb)
24{
25 struct ieee80211_local *local = hw_to_local(hw);
26 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
27 int tmp;
28
29 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
30 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
31 &local->skb_queue : &local->skb_queue_unreliable, skb);
32 tmp = skb_queue_len(&local->skb_queue) +
33 skb_queue_len(&local->skb_queue_unreliable);
34 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
35 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
36 ieee80211_free_txskb(hw, skb);
37 tmp--;
38 I802_DEBUG_INC(local->tx_status_drop);
39 }
40 tasklet_schedule(&local->tasklet);
41}
42EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
43
44static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
45 struct sta_info *sta,
46 struct sk_buff *skb)
47{
48 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
49 struct ieee80211_hdr *hdr = (void *)skb->data;
50 int ac;
51
52 if (info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER |
53 IEEE80211_TX_CTL_AMPDU |
54 IEEE80211_TX_CTL_HW_80211_ENCAP)) {
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->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
72 info->flags |= IEEE80211_TX_INTFL_RETRANSMISSION;
73 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
74
75 sta->deflink.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 = ieee80211_ac_from_tid(tid);
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
188 if (ieee80211_is_data_qos(mgmt->frame_control)) {
189 struct ieee80211_hdr *hdr = (void *) skb->data;
190 u8 *qc = ieee80211_get_qos_ctl(hdr);
191 u16 tid = qc[0] & 0xf;
192
193 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
194 }
195}
196
197static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
198{
199 struct tid_ampdu_tx *tid_tx;
200
201 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
202 if (!tid_tx)
203 return;
204
205 tid_tx->failed_bar_ssn = ssn;
206 tid_tx->bar_pending = true;
207}
208
209static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info,
210 struct ieee80211_tx_status *status)
211{
212 struct ieee80211_rate_status *status_rate = NULL;
213 int len = sizeof(struct ieee80211_radiotap_header);
214
215 if (status && status->n_rates)
216 status_rate = &status->rates[status->n_rates - 1];
217
218 /* IEEE80211_RADIOTAP_RATE rate */
219 if (status_rate && !(status_rate->rate_idx.flags &
220 (RATE_INFO_FLAGS_MCS |
221 RATE_INFO_FLAGS_DMG |
222 RATE_INFO_FLAGS_EDMG |
223 RATE_INFO_FLAGS_VHT_MCS |
224 RATE_INFO_FLAGS_HE_MCS)))
225 len += 2;
226 else if (info->status.rates[0].idx >= 0 &&
227 !(info->status.rates[0].flags &
228 (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)))
229 len += 2;
230
231 /* IEEE80211_RADIOTAP_TX_FLAGS */
232 len += 2;
233
234 /* IEEE80211_RADIOTAP_DATA_RETRIES */
235 len += 1;
236
237 /* IEEE80211_RADIOTAP_MCS
238 * IEEE80211_RADIOTAP_VHT */
239 if (status_rate) {
240 if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_MCS)
241 len += 3;
242 else if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_VHT_MCS)
243 len = ALIGN(len, 2) + 12;
244 else if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_HE_MCS)
245 len = ALIGN(len, 2) + 12;
246 } else if (info->status.rates[0].idx >= 0) {
247 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
248 len += 3;
249 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
250 len = ALIGN(len, 2) + 12;
251 }
252
253 return len;
254}
255
256static void
257ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
258 struct sk_buff *skb, int retry_count,
259 int rtap_len,
260 struct ieee80211_tx_status *status)
261{
262 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
263 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
264 struct ieee80211_radiotap_header *rthdr;
265 struct ieee80211_rate_status *status_rate = NULL;
266 unsigned char *pos;
267 u16 legacy_rate = 0;
268 u16 txflags;
269
270 if (status && status->n_rates)
271 status_rate = &status->rates[status->n_rates - 1];
272
273 rthdr = skb_push(skb, rtap_len);
274
275 memset(rthdr, 0, rtap_len);
276 rthdr->it_len = cpu_to_le16(rtap_len);
277 rthdr->it_present =
278 cpu_to_le32(BIT(IEEE80211_RADIOTAP_TX_FLAGS) |
279 BIT(IEEE80211_RADIOTAP_DATA_RETRIES));
280 pos = (unsigned char *)(rthdr + 1);
281
282 /*
283 * XXX: Once radiotap gets the bitmap reset thing the vendor
284 * extensions proposal contains, we can actually report
285 * the whole set of tries we did.
286 */
287
288 /* IEEE80211_RADIOTAP_RATE */
289
290 if (status_rate) {
291 if (!(status_rate->rate_idx.flags &
292 (RATE_INFO_FLAGS_MCS |
293 RATE_INFO_FLAGS_DMG |
294 RATE_INFO_FLAGS_EDMG |
295 RATE_INFO_FLAGS_VHT_MCS |
296 RATE_INFO_FLAGS_HE_MCS)))
297 legacy_rate = status_rate->rate_idx.legacy;
298 } else if (info->status.rates[0].idx >= 0 &&
299 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
300 IEEE80211_TX_RC_VHT_MCS))) {
301 struct ieee80211_supported_band *sband;
302
303 sband = local->hw.wiphy->bands[info->band];
304 legacy_rate =
305 sband->bitrates[info->status.rates[0].idx].bitrate;
306 }
307
308 if (legacy_rate) {
309 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_RATE));
310 *pos = DIV_ROUND_UP(legacy_rate, 5);
311 /* padding for tx flags */
312 pos += 2;
313 }
314
315 /* IEEE80211_RADIOTAP_TX_FLAGS */
316 txflags = 0;
317 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
318 !is_multicast_ether_addr(hdr->addr1))
319 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
320
321 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
322 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
323 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
324 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
325
326 put_unaligned_le16(txflags, pos);
327 pos += 2;
328
329 /* IEEE80211_RADIOTAP_DATA_RETRIES */
330 /* for now report the total retry_count */
331 *pos = retry_count;
332 pos++;
333
334 if (status_rate && (status_rate->rate_idx.flags & RATE_INFO_FLAGS_MCS))
335 {
336 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS));
337 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
338 IEEE80211_RADIOTAP_MCS_HAVE_GI |
339 IEEE80211_RADIOTAP_MCS_HAVE_BW;
340 if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_SHORT_GI)
341 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
342 if (status_rate->rate_idx.bw == RATE_INFO_BW_40)
343 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
344 pos[2] = status_rate->rate_idx.mcs;
345 pos += 3;
346 } else if (status_rate && (status_rate->rate_idx.flags &
347 RATE_INFO_FLAGS_VHT_MCS))
348 {
349 u16 known = local->hw.radiotap_vht_details &
350 (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
351 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
352
353 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT));
354
355 /* required alignment from rthdr */
356 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
357
358 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
359 put_unaligned_le16(known, pos);
360 pos += 2;
361
362 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
363 if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_SHORT_GI)
364 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
365 pos++;
366
367 /* u8 bandwidth */
368 switch (status_rate->rate_idx.bw) {
369 case RATE_INFO_BW_160:
370 *pos = 11;
371 break;
372 case RATE_INFO_BW_80:
373 *pos = 4;
374 break;
375 case RATE_INFO_BW_40:
376 *pos = 1;
377 break;
378 default:
379 *pos = 0;
380 break;
381 }
382 pos++;
383
384 /* u8 mcs_nss[4] */
385 *pos = (status_rate->rate_idx.mcs << 4) |
386 status_rate->rate_idx.nss;
387 pos += 4;
388
389 /* u8 coding */
390 pos++;
391 /* u8 group_id */
392 pos++;
393 /* u16 partial_aid */
394 pos += 2;
395 } else if (status_rate && (status_rate->rate_idx.flags &
396 RATE_INFO_FLAGS_HE_MCS))
397 {
398 struct ieee80211_radiotap_he *he;
399
400 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE));
401
402 /* required alignment from rthdr */
403 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
404 he = (struct ieee80211_radiotap_he *)pos;
405
406 he->data1 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA1_FORMAT_SU |
407 IEEE80211_RADIOTAP_HE_DATA1_DATA_MCS_KNOWN |
408 IEEE80211_RADIOTAP_HE_DATA1_DATA_DCM_KNOWN |
409 IEEE80211_RADIOTAP_HE_DATA1_BW_RU_ALLOC_KNOWN);
410
411 he->data2 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA2_GI_KNOWN);
412
413#define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
414
415 he->data6 |= HE_PREP(DATA6_NSTS, status_rate->rate_idx.nss);
416
417#define CHECK_GI(s) \
418 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
419 (int)NL80211_RATE_INFO_HE_GI_##s)
420
421 CHECK_GI(0_8);
422 CHECK_GI(1_6);
423 CHECK_GI(3_2);
424
425 he->data3 |= HE_PREP(DATA3_DATA_MCS, status_rate->rate_idx.mcs);
426 he->data3 |= HE_PREP(DATA3_DATA_DCM, status_rate->rate_idx.he_dcm);
427
428 he->data5 |= HE_PREP(DATA5_GI, status_rate->rate_idx.he_gi);
429
430 switch (status_rate->rate_idx.bw) {
431 case RATE_INFO_BW_20:
432 he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
433 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
434 break;
435 case RATE_INFO_BW_40:
436 he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
437 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
438 break;
439 case RATE_INFO_BW_80:
440 he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
441 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
442 break;
443 case RATE_INFO_BW_160:
444 he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
445 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
446 break;
447 case RATE_INFO_BW_HE_RU:
448#define CHECK_RU_ALLOC(s) \
449 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
450 NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
451
452 CHECK_RU_ALLOC(26);
453 CHECK_RU_ALLOC(52);
454 CHECK_RU_ALLOC(106);
455 CHECK_RU_ALLOC(242);
456 CHECK_RU_ALLOC(484);
457 CHECK_RU_ALLOC(996);
458 CHECK_RU_ALLOC(2x996);
459
460 he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
461 status_rate->rate_idx.he_ru_alloc + 4);
462 break;
463 default:
464 WARN_ONCE(1, "Invalid SU BW %d\n", status_rate->rate_idx.bw);
465 }
466
467 pos += sizeof(struct ieee80211_radiotap_he);
468 }
469
470 if (status_rate || info->status.rates[0].idx < 0)
471 return;
472
473 /* IEEE80211_RADIOTAP_MCS
474 * IEEE80211_RADIOTAP_VHT */
475 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
476 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS));
477 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
478 IEEE80211_RADIOTAP_MCS_HAVE_GI |
479 IEEE80211_RADIOTAP_MCS_HAVE_BW;
480 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
481 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
482 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
483 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
484 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
485 pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
486 pos[2] = info->status.rates[0].idx;
487 pos += 3;
488 } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
489 u16 known = local->hw.radiotap_vht_details &
490 (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
491 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
492
493 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT));
494
495 /* required alignment from rthdr */
496 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
497
498 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
499 put_unaligned_le16(known, pos);
500 pos += 2;
501
502 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
503 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
504 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
505 pos++;
506
507 /* u8 bandwidth */
508 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
509 *pos = 1;
510 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
511 *pos = 4;
512 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
513 *pos = 11;
514 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
515 *pos = 0;
516 pos++;
517
518 /* u8 mcs_nss[4] */
519 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
520 ieee80211_rate_get_vht_nss(&info->status.rates[0]);
521 pos += 4;
522
523 /* u8 coding */
524 pos++;
525 /* u8 group_id */
526 pos++;
527 /* u16 partial_aid */
528 pos += 2;
529 }
530}
531
532/*
533 * Handles the tx for TDLS teardown frames.
534 * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
535 */
536static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
537 struct ieee80211_sub_if_data *sdata,
538 struct sk_buff *skb, u32 flags)
539{
540 struct sk_buff *teardown_skb;
541 struct sk_buff *orig_teardown_skb;
542 bool is_teardown = false;
543
544 /* Get the teardown data we need and free the lock */
545 spin_lock(&sdata->u.mgd.teardown_lock);
546 teardown_skb = sdata->u.mgd.teardown_skb;
547 orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
548 if ((skb == orig_teardown_skb) && teardown_skb) {
549 sdata->u.mgd.teardown_skb = NULL;
550 sdata->u.mgd.orig_teardown_skb = NULL;
551 is_teardown = true;
552 }
553 spin_unlock(&sdata->u.mgd.teardown_lock);
554
555 if (is_teardown) {
556 /* This mechanism relies on being able to get ACKs */
557 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
558
559 /* Check if peer has ACKed */
560 if (flags & IEEE80211_TX_STAT_ACK) {
561 dev_kfree_skb_any(teardown_skb);
562 } else {
563 tdls_dbg(sdata,
564 "TDLS Resending teardown through AP\n");
565
566 ieee80211_subif_start_xmit(teardown_skb, skb->dev);
567 }
568 }
569}
570
571static struct ieee80211_sub_if_data *
572ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
573{
574 struct ieee80211_sub_if_data *sdata;
575
576 if (skb->dev) {
577 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
578 if (!sdata->dev)
579 continue;
580
581 if (skb->dev == sdata->dev)
582 return sdata;
583 }
584
585 return NULL;
586 }
587
588 return rcu_dereference(local->p2p_sdata);
589}
590
591static void ieee80211_report_ack_skb(struct ieee80211_local *local,
592 struct sk_buff *orig_skb,
593 bool acked, bool dropped,
594 ktime_t ack_hwtstamp)
595{
596 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(orig_skb);
597 struct sk_buff *skb;
598 unsigned long flags;
599
600 spin_lock_irqsave(&local->ack_status_lock, flags);
601 skb = idr_remove(&local->ack_status_frames, info->status_data);
602 spin_unlock_irqrestore(&local->ack_status_lock, flags);
603
604 if (!skb)
605 return;
606
607 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
608 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
609 struct ieee80211_sub_if_data *sdata;
610 struct ieee80211_hdr *hdr = (void *)skb->data;
611 bool is_valid_ack_signal =
612 !!(info->status.flags & IEEE80211_TX_STATUS_ACK_SIGNAL_VALID);
613 struct cfg80211_tx_status status = {
614 .cookie = cookie,
615 .buf = skb->data,
616 .len = skb->len,
617 .ack = acked,
618 };
619
620 if (ieee80211_is_timing_measurement(orig_skb) ||
621 ieee80211_is_ftm(orig_skb)) {
622 status.tx_tstamp =
623 ktime_to_ns(skb_hwtstamps(orig_skb)->hwtstamp);
624 status.ack_tstamp = ktime_to_ns(ack_hwtstamp);
625 }
626
627 rcu_read_lock();
628 sdata = ieee80211_sdata_from_skb(local, skb);
629 if (sdata) {
630 if (skb->protocol == sdata->control_port_protocol ||
631 skb->protocol == cpu_to_be16(ETH_P_PREAUTH))
632 cfg80211_control_port_tx_status(&sdata->wdev,
633 cookie,
634 skb->data,
635 skb->len,
636 acked,
637 GFP_ATOMIC);
638 else if (ieee80211_is_any_nullfunc(hdr->frame_control))
639 cfg80211_probe_status(sdata->dev, hdr->addr1,
640 cookie, acked,
641 info->status.ack_signal,
642 is_valid_ack_signal,
643 GFP_ATOMIC);
644 else if (ieee80211_is_mgmt(hdr->frame_control))
645 cfg80211_mgmt_tx_status_ext(&sdata->wdev,
646 &status,
647 GFP_ATOMIC);
648 else
649 pr_warn("Unknown status report in ack skb\n");
650
651 }
652 rcu_read_unlock();
653
654 dev_kfree_skb_any(skb);
655 } else if (dropped) {
656 dev_kfree_skb_any(skb);
657 } else {
658 /* consumes skb */
659 skb_complete_wifi_ack(skb, acked);
660 }
661}
662
663static void ieee80211_handle_smps_status(struct ieee80211_sub_if_data *sdata,
664 bool acked, u16 status_data)
665{
666 u16 sub_data = u16_get_bits(status_data, IEEE80211_STATUS_SUBDATA_MASK);
667 enum ieee80211_smps_mode smps_mode = sub_data & 3;
668 int link_id = (sub_data >> 2);
669 struct ieee80211_link_data *link;
670
671 if (!sdata || !ieee80211_sdata_running(sdata))
672 return;
673
674 if (!acked)
675 return;
676
677 if (sdata->vif.type != NL80211_IFTYPE_STATION)
678 return;
679
680 if (WARN(link_id >= ARRAY_SIZE(sdata->link),
681 "bad SMPS status link: %d\n", link_id))
682 return;
683
684 link = rcu_dereference(sdata->link[link_id]);
685 if (!link)
686 return;
687
688 /*
689 * This update looks racy, but isn't, the only other place
690 * updating this variable is in managed mode before assoc,
691 * and we have to be associated to have a status from the
692 * action frame TX, since we cannot send it while we're not
693 * associated yet.
694 */
695 link->smps_mode = smps_mode;
696 wiphy_work_queue(sdata->local->hw.wiphy, &link->u.mgd.recalc_smps);
697}
698
699static void
700ieee80211_handle_teardown_ttlm_status(struct ieee80211_sub_if_data *sdata,
701 bool acked)
702{
703 if (!sdata || !ieee80211_sdata_running(sdata))
704 return;
705
706 if (!acked)
707 return;
708
709 if (sdata->vif.type != NL80211_IFTYPE_STATION)
710 return;
711
712 wiphy_work_queue(sdata->local->hw.wiphy,
713 &sdata->u.mgd.teardown_ttlm_work);
714}
715
716static void ieee80211_report_used_skb(struct ieee80211_local *local,
717 struct sk_buff *skb, bool dropped,
718 ktime_t ack_hwtstamp)
719{
720 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
721 u16 tx_time_est = ieee80211_info_get_tx_time_est(info);
722 struct ieee80211_hdr *hdr = (void *)skb->data;
723 bool acked = info->flags & IEEE80211_TX_STAT_ACK;
724
725 if (dropped)
726 acked = false;
727
728 if (tx_time_est) {
729 struct sta_info *sta;
730
731 rcu_read_lock();
732
733 sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
734 ieee80211_sta_update_pending_airtime(local, sta,
735 skb_get_queue_mapping(skb),
736 tx_time_est,
737 true);
738 rcu_read_unlock();
739 }
740
741 if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
742 struct ieee80211_sub_if_data *sdata;
743
744 rcu_read_lock();
745
746 sdata = ieee80211_sdata_from_skb(local, skb);
747
748 if (!sdata) {
749 skb->dev = NULL;
750 } else if (!dropped) {
751 /* Check to see if packet is a TDLS teardown packet */
752 if (ieee80211_is_data(hdr->frame_control) &&
753 (ieee80211_get_tdls_action(skb) ==
754 WLAN_TDLS_TEARDOWN)) {
755 ieee80211_tdls_td_tx_handle(local, sdata, skb,
756 info->flags);
757 } else if (ieee80211_s1g_is_twt_setup(skb)) {
758 if (!acked) {
759 struct sk_buff *qskb;
760
761 qskb = skb_clone(skb, GFP_ATOMIC);
762 if (qskb) {
763 skb_queue_tail(&sdata->status_queue,
764 qskb);
765 wiphy_work_queue(local->hw.wiphy,
766 &sdata->work);
767 }
768 }
769 } else {
770 ieee80211_mgd_conn_tx_status(sdata,
771 hdr->frame_control,
772 acked);
773 }
774 }
775
776 rcu_read_unlock();
777 } else if (info->status_data_idr) {
778 ieee80211_report_ack_skb(local, skb, acked, dropped,
779 ack_hwtstamp);
780 } else if (info->status_data) {
781 struct ieee80211_sub_if_data *sdata;
782
783 rcu_read_lock();
784
785 sdata = ieee80211_sdata_from_skb(local, skb);
786
787 switch (u16_get_bits(info->status_data,
788 IEEE80211_STATUS_TYPE_MASK)) {
789 case IEEE80211_STATUS_TYPE_SMPS:
790 ieee80211_handle_smps_status(sdata, acked,
791 info->status_data);
792 break;
793 case IEEE80211_STATUS_TYPE_NEG_TTLM:
794 ieee80211_handle_teardown_ttlm_status(sdata, acked);
795 break;
796 }
797 rcu_read_unlock();
798 }
799
800 if (!dropped && skb->destructor) {
801 skb->wifi_acked_valid = 1;
802 skb->wifi_acked = acked;
803 }
804
805 ieee80211_led_tx(local);
806
807 if (skb_has_frag_list(skb)) {
808 kfree_skb_list(skb_shinfo(skb)->frag_list);
809 skb_shinfo(skb)->frag_list = NULL;
810 }
811}
812
813/*
814 * Use a static threshold for now, best value to be determined
815 * by testing ...
816 * Should it depend on:
817 * - on # of retransmissions
818 * - current throughput (higher value for higher tpt)?
819 */
820#define STA_LOST_PKT_THRESHOLD 50
821#define STA_LOST_PKT_TIME HZ /* 1 sec since last ACK */
822#define STA_LOST_TDLS_PKT_TIME (10*HZ) /* 10secs since last ACK */
823
824static void ieee80211_lost_packet(struct sta_info *sta,
825 struct ieee80211_tx_info *info)
826{
827 unsigned long pkt_time = STA_LOST_PKT_TIME;
828 unsigned int pkt_thr = STA_LOST_PKT_THRESHOLD;
829
830 /* If driver relies on its own algorithm for station kickout, skip
831 * mac80211 packet loss mechanism.
832 */
833 if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
834 return;
835
836 /* This packet was aggregated but doesn't carry status info */
837 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
838 !(info->flags & IEEE80211_TX_STAT_AMPDU))
839 return;
840
841 sta->deflink.status_stats.lost_packets++;
842 if (sta->sta.tdls) {
843 pkt_time = STA_LOST_TDLS_PKT_TIME;
844 pkt_thr = STA_LOST_PKT_THRESHOLD;
845 }
846
847 /*
848 * If we're in TDLS mode, make sure that all STA_LOST_PKT_THRESHOLD
849 * of the last packets were lost, and that no ACK was received in the
850 * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
851 * mechanism.
852 * For non-TDLS, use STA_LOST_PKT_THRESHOLD and STA_LOST_PKT_TIME
853 */
854 if (sta->deflink.status_stats.lost_packets < pkt_thr ||
855 !time_after(jiffies, sta->deflink.status_stats.last_pkt_time + pkt_time))
856 return;
857
858 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
859 sta->deflink.status_stats.lost_packets,
860 GFP_ATOMIC);
861 sta->deflink.status_stats.lost_packets = 0;
862}
863
864static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
865 struct ieee80211_tx_info *info,
866 int *retry_count)
867{
868 int count = -1;
869 int i;
870
871 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
872 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
873 !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
874 /* just the first aggr frame carry status info */
875 info->status.rates[i].idx = -1;
876 info->status.rates[i].count = 0;
877 break;
878 } else if (info->status.rates[i].idx < 0) {
879 break;
880 } else if (i >= hw->max_report_rates) {
881 /* the HW cannot have attempted that rate */
882 info->status.rates[i].idx = -1;
883 info->status.rates[i].count = 0;
884 break;
885 }
886
887 count += info->status.rates[i].count;
888 }
889
890 if (count < 0)
891 count = 0;
892
893 *retry_count = count;
894 return i - 1;
895}
896
897void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
898 int retry_count, bool send_to_cooked,
899 struct ieee80211_tx_status *status)
900{
901 struct sk_buff *skb2;
902 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
903 struct ieee80211_sub_if_data *sdata;
904 struct net_device *prev_dev = NULL;
905 int rtap_len;
906
907 /* send frame to monitor interfaces now */
908 rtap_len = ieee80211_tx_radiotap_len(info, status);
909 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
910 pr_err("ieee80211_tx_status: headroom too small\n");
911 dev_kfree_skb(skb);
912 return;
913 }
914 ieee80211_add_tx_radiotap_header(local, skb, retry_count,
915 rtap_len, status);
916
917 /* XXX: is this sufficient for BPF? */
918 skb_reset_mac_header(skb);
919 skb->ip_summed = CHECKSUM_UNNECESSARY;
920 skb->pkt_type = PACKET_OTHERHOST;
921 skb->protocol = htons(ETH_P_802_2);
922 memset(skb->cb, 0, sizeof(skb->cb));
923
924 rcu_read_lock();
925 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
926 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
927 if (!ieee80211_sdata_running(sdata))
928 continue;
929
930 if (sdata->u.mntr.flags & MONITOR_FLAG_SKIP_TX)
931 continue;
932
933 if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
934 !send_to_cooked)
935 continue;
936
937 if (prev_dev) {
938 skb2 = skb_clone(skb, GFP_ATOMIC);
939 if (skb2) {
940 skb2->dev = prev_dev;
941 netif_rx(skb2);
942 }
943 }
944
945 prev_dev = sdata->dev;
946 }
947 }
948 if (prev_dev) {
949 skb->dev = prev_dev;
950 netif_rx(skb);
951 skb = NULL;
952 }
953 rcu_read_unlock();
954 dev_kfree_skb(skb);
955}
956
957static void __ieee80211_tx_status(struct ieee80211_hw *hw,
958 struct ieee80211_tx_status *status,
959 int rates_idx, int retry_count)
960{
961 struct sk_buff *skb = status->skb;
962 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
963 struct ieee80211_local *local = hw_to_local(hw);
964 struct ieee80211_tx_info *info = status->info;
965 struct sta_info *sta;
966 __le16 fc;
967 bool send_to_cooked;
968 bool acked;
969 bool noack_success;
970 struct ieee80211_bar *bar;
971 int tid = IEEE80211_NUM_TIDS;
972
973 fc = hdr->frame_control;
974
975 if (status->sta) {
976 sta = container_of(status->sta, struct sta_info, sta);
977
978 if (info->flags & IEEE80211_TX_STATUS_EOSP)
979 clear_sta_flag(sta, WLAN_STA_SP);
980
981 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
982 noack_success = !!(info->flags &
983 IEEE80211_TX_STAT_NOACK_TRANSMITTED);
984
985 /* mesh Peer Service Period support */
986 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
987 ieee80211_is_data_qos(fc))
988 ieee80211_mpsp_trigger_process(
989 ieee80211_get_qos_ctl(hdr), sta, true, acked);
990
991 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
992 (ieee80211_is_data(hdr->frame_control)) &&
993 (rates_idx != -1))
994 sta->deflink.tx_stats.last_rate =
995 info->status.rates[rates_idx];
996
997 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
998 (ieee80211_is_data_qos(fc))) {
999 u16 ssn;
1000 u8 *qc;
1001
1002 qc = ieee80211_get_qos_ctl(hdr);
1003 tid = qc[0] & 0xf;
1004 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
1005 & IEEE80211_SCTL_SEQ);
1006 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
1007 tid, ssn);
1008 } else if (ieee80211_is_data_qos(fc)) {
1009 u8 *qc = ieee80211_get_qos_ctl(hdr);
1010
1011 tid = qc[0] & 0xf;
1012 }
1013
1014 if (!acked && ieee80211_is_back_req(fc)) {
1015 u16 control;
1016
1017 /*
1018 * BAR failed, store the last SSN and retry sending
1019 * the BAR when the next unicast transmission on the
1020 * same TID succeeds.
1021 */
1022 bar = (struct ieee80211_bar *) skb->data;
1023 control = le16_to_cpu(bar->control);
1024 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
1025 u16 ssn = le16_to_cpu(bar->start_seq_num);
1026
1027 tid = (control &
1028 IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
1029 IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
1030
1031 ieee80211_set_bar_pending(sta, tid, ssn);
1032 }
1033 }
1034
1035 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1036 ieee80211_handle_filtered_frame(local, sta, skb);
1037 return;
1038 } else if (ieee80211_is_data_present(fc)) {
1039 if (!acked && !noack_success)
1040 sta->deflink.status_stats.msdu_failed[tid]++;
1041
1042 sta->deflink.status_stats.msdu_retries[tid] +=
1043 retry_count;
1044 }
1045
1046 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
1047 ieee80211_frame_acked(sta, skb);
1048
1049 }
1050
1051 /* SNMP counters
1052 * Fragments are passed to low-level drivers as separate skbs, so these
1053 * are actually fragments, not frames. Update frame counters only for
1054 * the first fragment of the frame. */
1055 if ((info->flags & IEEE80211_TX_STAT_ACK) ||
1056 (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
1057 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
1058 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1059 if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
1060 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1061 if (retry_count > 0)
1062 I802_DEBUG_INC(local->dot11RetryCount);
1063 if (retry_count > 1)
1064 I802_DEBUG_INC(local->dot11MultipleRetryCount);
1065 }
1066
1067 /* This counter shall be incremented for an acknowledged MPDU
1068 * with an individual address in the address 1 field or an MPDU
1069 * with a multicast address in the address 1 field of type Data
1070 * or Management. */
1071 if (!is_multicast_ether_addr(hdr->addr1) ||
1072 ieee80211_is_data(fc) ||
1073 ieee80211_is_mgmt(fc))
1074 I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
1075 } else {
1076 if (ieee80211_is_first_frag(hdr->seq_ctrl))
1077 I802_DEBUG_INC(local->dot11FailedCount);
1078 }
1079
1080 if (ieee80211_is_any_nullfunc(fc) &&
1081 ieee80211_has_pm(fc) &&
1082 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1083 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
1084 local->ps_sdata && !(local->scanning)) {
1085 if (info->flags & IEEE80211_TX_STAT_ACK)
1086 local->ps_sdata->u.mgd.flags |=
1087 IEEE80211_STA_NULLFUNC_ACKED;
1088 mod_timer(&local->dynamic_ps_timer,
1089 jiffies + msecs_to_jiffies(10));
1090 }
1091
1092 ieee80211_report_used_skb(local, skb, false, status->ack_hwtstamp);
1093
1094 /* this was a transmitted frame, but now we want to reuse it */
1095 skb_orphan(skb);
1096
1097 /* Need to make a copy before skb->cb gets cleared */
1098 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
1099 !(ieee80211_is_data(fc));
1100
1101 /*
1102 * This is a bit racy but we can avoid a lot of work
1103 * with this test...
1104 */
1105 if (!local->tx_mntrs && (!send_to_cooked || !local->cooked_mntrs)) {
1106 if (status->free_list)
1107 list_add_tail(&skb->list, status->free_list);
1108 else
1109 dev_kfree_skb(skb);
1110 return;
1111 }
1112
1113 /* send to monitor interfaces */
1114 ieee80211_tx_monitor(local, skb, retry_count,
1115 send_to_cooked, status);
1116}
1117
1118void ieee80211_tx_status_skb(struct ieee80211_hw *hw, struct sk_buff *skb)
1119{
1120 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1121 struct ieee80211_local *local = hw_to_local(hw);
1122 struct ieee80211_tx_status status = {
1123 .skb = skb,
1124 .info = IEEE80211_SKB_CB(skb),
1125 };
1126 struct sta_info *sta;
1127
1128 rcu_read_lock();
1129
1130 sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
1131 if (sta)
1132 status.sta = &sta->sta;
1133
1134 ieee80211_tx_status_ext(hw, &status);
1135 rcu_read_unlock();
1136}
1137EXPORT_SYMBOL(ieee80211_tx_status_skb);
1138
1139void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
1140 struct ieee80211_tx_status *status)
1141{
1142 struct ieee80211_local *local = hw_to_local(hw);
1143 struct ieee80211_tx_info *info = status->info;
1144 struct ieee80211_sta *pubsta = status->sta;
1145 struct sk_buff *skb = status->skb;
1146 struct sta_info *sta = NULL;
1147 int rates_idx, retry_count;
1148 bool acked, noack_success, ack_signal_valid;
1149 u16 tx_time_est;
1150
1151 if (pubsta) {
1152 sta = container_of(pubsta, struct sta_info, sta);
1153
1154 if (status->n_rates)
1155 sta->deflink.tx_stats.last_rate_info =
1156 status->rates[status->n_rates - 1].rate_idx;
1157 }
1158
1159 if (skb && (tx_time_est =
1160 ieee80211_info_get_tx_time_est(IEEE80211_SKB_CB(skb))) > 0) {
1161 /* Do this here to avoid the expensive lookup of the sta
1162 * in ieee80211_report_used_skb().
1163 */
1164 ieee80211_sta_update_pending_airtime(local, sta,
1165 skb_get_queue_mapping(skb),
1166 tx_time_est,
1167 true);
1168 ieee80211_info_set_tx_time_est(IEEE80211_SKB_CB(skb), 0);
1169 }
1170
1171 if (!status->info)
1172 goto free;
1173
1174 rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
1175
1176 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
1177 noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
1178 ack_signal_valid =
1179 !!(info->status.flags & IEEE80211_TX_STATUS_ACK_SIGNAL_VALID);
1180
1181 if (pubsta) {
1182 struct ieee80211_sub_if_data *sdata = sta->sdata;
1183
1184 if (!acked && !noack_success)
1185 sta->deflink.status_stats.retry_failed++;
1186 sta->deflink.status_stats.retry_count += retry_count;
1187
1188 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
1189 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1190 skb && !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP))
1191 ieee80211_sta_tx_notify(sdata, (void *) skb->data,
1192 acked, info->status.tx_time);
1193
1194 if (acked) {
1195 sta->deflink.status_stats.last_ack = jiffies;
1196
1197 if (sta->deflink.status_stats.lost_packets)
1198 sta->deflink.status_stats.lost_packets = 0;
1199
1200 /* Track when last packet was ACKed */
1201 sta->deflink.status_stats.last_pkt_time = jiffies;
1202
1203 /* Reset connection monitor */
1204 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1205 unlikely(sdata->u.mgd.probe_send_count > 0))
1206 sdata->u.mgd.probe_send_count = 0;
1207
1208 if (ack_signal_valid) {
1209 sta->deflink.status_stats.last_ack_signal =
1210 (s8)info->status.ack_signal;
1211 sta->deflink.status_stats.ack_signal_filled = true;
1212 ewma_avg_signal_add(&sta->deflink.status_stats.avg_ack_signal,
1213 -info->status.ack_signal);
1214 }
1215 } else if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1216 /*
1217 * The STA is in power save mode, so assume
1218 * that this TX packet failed because of that.
1219 */
1220 if (skb)
1221 ieee80211_handle_filtered_frame(local, sta, skb);
1222 return;
1223 } else if (noack_success) {
1224 /* nothing to do here, do not account as lost */
1225 } else {
1226 ieee80211_lost_packet(sta, info);
1227 }
1228 }
1229
1230 rate_control_tx_status(local, status);
1231 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
1232 ieee80211s_update_metric(local, sta, status);
1233 }
1234
1235 if (skb && !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP))
1236 return __ieee80211_tx_status(hw, status, rates_idx,
1237 retry_count);
1238
1239 if (acked || noack_success) {
1240 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1241 if (!pubsta)
1242 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1243 if (retry_count > 0)
1244 I802_DEBUG_INC(local->dot11RetryCount);
1245 if (retry_count > 1)
1246 I802_DEBUG_INC(local->dot11MultipleRetryCount);
1247 } else {
1248 I802_DEBUG_INC(local->dot11FailedCount);
1249 }
1250
1251free:
1252 if (!skb)
1253 return;
1254
1255 ieee80211_report_used_skb(local, skb, false, status->ack_hwtstamp);
1256 if (status->free_list)
1257 list_add_tail(&skb->list, status->free_list);
1258 else
1259 dev_kfree_skb(skb);
1260}
1261EXPORT_SYMBOL(ieee80211_tx_status_ext);
1262
1263void ieee80211_tx_rate_update(struct ieee80211_hw *hw,
1264 struct ieee80211_sta *pubsta,
1265 struct ieee80211_tx_info *info)
1266{
1267 struct ieee80211_local *local = hw_to_local(hw);
1268 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1269 struct ieee80211_tx_status status = {
1270 .info = info,
1271 .sta = pubsta,
1272 };
1273
1274 rate_control_tx_status(local, &status);
1275
1276 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
1277 sta->deflink.tx_stats.last_rate = info->status.rates[0];
1278}
1279EXPORT_SYMBOL(ieee80211_tx_rate_update);
1280
1281void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
1282{
1283 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1284 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
1285 num_packets, GFP_ATOMIC);
1286}
1287EXPORT_SYMBOL(ieee80211_report_low_ack);
1288
1289void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
1290{
1291 struct ieee80211_local *local = hw_to_local(hw);
1292 ktime_t kt = ktime_set(0, 0);
1293
1294 ieee80211_report_used_skb(local, skb, true, kt);
1295 dev_kfree_skb_any(skb);
1296}
1297EXPORT_SYMBOL(ieee80211_free_txskb);
1298
1299void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
1300 struct sk_buff_head *skbs)
1301{
1302 struct sk_buff *skb;
1303
1304 while ((skb = __skb_dequeue(skbs)))
1305 ieee80211_free_txskb(hw, skb);
1306}
1307EXPORT_SYMBOL(ieee80211_purge_tx_queue);
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}