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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 */
9
10#include <linux/export.h>
11#include <linux/etherdevice.h>
12#include <net/mac80211.h>
13#include <asm/unaligned.h>
14#include "ieee80211_i.h"
15#include "rate.h"
16#include "mesh.h"
17#include "led.h"
18#include "wme.h"
19
20
21void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
22 struct sk_buff *skb)
23{
24 struct ieee80211_local *local = hw_to_local(hw);
25 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
26 int tmp;
27
28 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
29 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
30 &local->skb_queue : &local->skb_queue_unreliable, skb);
31 tmp = skb_queue_len(&local->skb_queue) +
32 skb_queue_len(&local->skb_queue_unreliable);
33 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
34 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
35 ieee80211_free_txskb(hw, skb);
36 tmp--;
37 I802_DEBUG_INC(local->tx_status_drop);
38 }
39 tasklet_schedule(&local->tasklet);
40}
41EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
42
43static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
44 struct sta_info *sta,
45 struct sk_buff *skb)
46{
47 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
48 struct ieee80211_hdr *hdr = (void *)skb->data;
49 int ac;
50
51 if (info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER |
52 IEEE80211_TX_CTL_AMPDU |
53 IEEE80211_TX_CTL_HW_80211_ENCAP)) {
54 ieee80211_free_txskb(&local->hw, skb);
55 return;
56 }
57
58 /*
59 * This skb 'survived' a round-trip through the driver, and
60 * hopefully the driver didn't mangle it too badly. However,
61 * we can definitely not rely on the control information
62 * being correct. Clear it so we don't get junk there, and
63 * indicate that it needs new processing, but must not be
64 * modified/encrypted again.
65 */
66 memset(&info->control, 0, sizeof(info->control));
67
68 info->control.jiffies = jiffies;
69 info->control.vif = &sta->sdata->vif;
70 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
71 info->flags |= IEEE80211_TX_INTFL_RETRANSMISSION;
72 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
73
74 sta->status_stats.filtered++;
75
76 /*
77 * Clear more-data bit on filtered frames, it might be set
78 * but later frames might time out so it might have to be
79 * clear again ... It's all rather unlikely (this frame
80 * should time out first, right?) but let's not confuse
81 * peers unnecessarily.
82 */
83 if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
84 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
85
86 if (ieee80211_is_data_qos(hdr->frame_control)) {
87 u8 *p = ieee80211_get_qos_ctl(hdr);
88 int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
89
90 /*
91 * Clear EOSP if set, this could happen e.g.
92 * if an absence period (us being a P2P GO)
93 * shortens the SP.
94 */
95 if (*p & IEEE80211_QOS_CTL_EOSP)
96 *p &= ~IEEE80211_QOS_CTL_EOSP;
97 ac = ieee80211_ac_from_tid(tid);
98 } else {
99 ac = IEEE80211_AC_BE;
100 }
101
102 /*
103 * Clear the TX filter mask for this STA when sending the next
104 * packet. If the STA went to power save mode, this will happen
105 * when it wakes up for the next time.
106 */
107 set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
108 ieee80211_clear_fast_xmit(sta);
109
110 /*
111 * This code races in the following way:
112 *
113 * (1) STA sends frame indicating it will go to sleep and does so
114 * (2) hardware/firmware adds STA to filter list, passes frame up
115 * (3) hardware/firmware processes TX fifo and suppresses a frame
116 * (4) we get TX status before having processed the frame and
117 * knowing that the STA has gone to sleep.
118 *
119 * This is actually quite unlikely even when both those events are
120 * processed from interrupts coming in quickly after one another or
121 * even at the same time because we queue both TX status events and
122 * RX frames to be processed by a tasklet and process them in the
123 * same order that they were received or TX status last. Hence, there
124 * is no race as long as the frame RX is processed before the next TX
125 * status, which drivers can ensure, see below.
126 *
127 * Note that this can only happen if the hardware or firmware can
128 * actually add STAs to the filter list, if this is done by the
129 * driver in response to set_tim() (which will only reduce the race
130 * this whole filtering tries to solve, not completely solve it)
131 * this situation cannot happen.
132 *
133 * To completely solve this race drivers need to make sure that they
134 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
135 * functions and
136 * (b) always process RX events before TX status events if ordering
137 * can be unknown, for example with different interrupt status
138 * bits.
139 * (c) if PS mode transitions are manual (i.e. the flag
140 * %IEEE80211_HW_AP_LINK_PS is set), always process PS state
141 * changes before calling TX status events if ordering can be
142 * unknown.
143 */
144 if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
145 skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
146 skb_queue_tail(&sta->tx_filtered[ac], skb);
147 sta_info_recalc_tim(sta);
148
149 if (!timer_pending(&local->sta_cleanup))
150 mod_timer(&local->sta_cleanup,
151 round_jiffies(jiffies +
152 STA_INFO_CLEANUP_INTERVAL));
153 return;
154 }
155
156 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
157 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
158 /* Software retry the packet once */
159 info->flags |= IEEE80211_TX_INTFL_RETRIED;
160 ieee80211_add_pending_skb(local, skb);
161 return;
162 }
163
164 ps_dbg_ratelimited(sta->sdata,
165 "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
166 skb_queue_len(&sta->tx_filtered[ac]),
167 !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
168 ieee80211_free_txskb(&local->hw, skb);
169}
170
171static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
172{
173 struct tid_ampdu_tx *tid_tx;
174
175 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
176 if (!tid_tx || !tid_tx->bar_pending)
177 return;
178
179 tid_tx->bar_pending = false;
180 ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
181}
182
183static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
184{
185 struct ieee80211_mgmt *mgmt = (void *) skb->data;
186 struct ieee80211_local *local = sta->local;
187 struct ieee80211_sub_if_data *sdata = sta->sdata;
188
189 if (ieee80211_is_data_qos(mgmt->frame_control)) {
190 struct ieee80211_hdr *hdr = (void *) skb->data;
191 u8 *qc = ieee80211_get_qos_ctl(hdr);
192 u16 tid = qc[0] & 0xf;
193
194 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
195 }
196
197 if (ieee80211_is_action(mgmt->frame_control) &&
198 !ieee80211_has_protected(mgmt->frame_control) &&
199 mgmt->u.action.category == WLAN_CATEGORY_HT &&
200 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
201 ieee80211_sdata_running(sdata)) {
202 enum ieee80211_smps_mode smps_mode;
203
204 switch (mgmt->u.action.u.ht_smps.smps_control) {
205 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
206 smps_mode = IEEE80211_SMPS_DYNAMIC;
207 break;
208 case WLAN_HT_SMPS_CONTROL_STATIC:
209 smps_mode = IEEE80211_SMPS_STATIC;
210 break;
211 case WLAN_HT_SMPS_CONTROL_DISABLED:
212 default: /* shouldn't happen since we don't send that */
213 smps_mode = IEEE80211_SMPS_OFF;
214 break;
215 }
216
217 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
218 /*
219 * This update looks racy, but isn't -- if we come
220 * here we've definitely got a station that we're
221 * talking to, and on a managed interface that can
222 * only be the AP. And the only other place updating
223 * this variable in managed mode is before association.
224 */
225 sdata->smps_mode = smps_mode;
226 ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
227 } else if (sdata->vif.type == NL80211_IFTYPE_AP ||
228 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
229 sta->known_smps_mode = smps_mode;
230 }
231 }
232}
233
234static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
235{
236 struct tid_ampdu_tx *tid_tx;
237
238 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
239 if (!tid_tx)
240 return;
241
242 tid_tx->failed_bar_ssn = ssn;
243 tid_tx->bar_pending = true;
244}
245
246static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info,
247 struct ieee80211_tx_status *status)
248{
249 int len = sizeof(struct ieee80211_radiotap_header);
250
251 /* IEEE80211_RADIOTAP_RATE rate */
252 if (status && status->rate && !(status->rate->flags &
253 (RATE_INFO_FLAGS_MCS |
254 RATE_INFO_FLAGS_DMG |
255 RATE_INFO_FLAGS_EDMG |
256 RATE_INFO_FLAGS_VHT_MCS |
257 RATE_INFO_FLAGS_HE_MCS)))
258 len += 2;
259 else if (info->status.rates[0].idx >= 0 &&
260 !(info->status.rates[0].flags &
261 (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)))
262 len += 2;
263
264 /* IEEE80211_RADIOTAP_TX_FLAGS */
265 len += 2;
266
267 /* IEEE80211_RADIOTAP_DATA_RETRIES */
268 len += 1;
269
270 /* IEEE80211_RADIOTAP_MCS
271 * IEEE80211_RADIOTAP_VHT */
272 if (status && status->rate) {
273 if (status->rate->flags & RATE_INFO_FLAGS_MCS)
274 len += 3;
275 else if (status->rate->flags & RATE_INFO_FLAGS_VHT_MCS)
276 len = ALIGN(len, 2) + 12;
277 else if (status->rate->flags & RATE_INFO_FLAGS_HE_MCS)
278 len = ALIGN(len, 2) + 12;
279 } else if (info->status.rates[0].idx >= 0) {
280 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
281 len += 3;
282 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
283 len = ALIGN(len, 2) + 12;
284 }
285
286 return len;
287}
288
289static void
290ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
291 struct ieee80211_supported_band *sband,
292 struct sk_buff *skb, int retry_count,
293 int rtap_len, int shift,
294 struct ieee80211_tx_status *status)
295{
296 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
297 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
298 struct ieee80211_radiotap_header *rthdr;
299 unsigned char *pos;
300 u16 legacy_rate = 0;
301 u16 txflags;
302
303 rthdr = skb_push(skb, rtap_len);
304
305 memset(rthdr, 0, rtap_len);
306 rthdr->it_len = cpu_to_le16(rtap_len);
307 rthdr->it_present =
308 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
309 (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
310 pos = (unsigned char *)(rthdr + 1);
311
312 /*
313 * XXX: Once radiotap gets the bitmap reset thing the vendor
314 * extensions proposal contains, we can actually report
315 * the whole set of tries we did.
316 */
317
318 /* IEEE80211_RADIOTAP_RATE */
319
320 if (status && status->rate) {
321 if (!(status->rate->flags & (RATE_INFO_FLAGS_MCS |
322 RATE_INFO_FLAGS_DMG |
323 RATE_INFO_FLAGS_EDMG |
324 RATE_INFO_FLAGS_VHT_MCS |
325 RATE_INFO_FLAGS_HE_MCS)))
326 legacy_rate = status->rate->legacy;
327 } else if (info->status.rates[0].idx >= 0 &&
328 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
329 IEEE80211_TX_RC_VHT_MCS)))
330 legacy_rate =
331 sband->bitrates[info->status.rates[0].idx].bitrate;
332
333 if (legacy_rate) {
334 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
335 *pos = DIV_ROUND_UP(legacy_rate, 5 * (1 << shift));
336 /* padding for tx flags */
337 pos += 2;
338 }
339
340 /* IEEE80211_RADIOTAP_TX_FLAGS */
341 txflags = 0;
342 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
343 !is_multicast_ether_addr(hdr->addr1))
344 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
345
346 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
347 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
348 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
349 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
350
351 put_unaligned_le16(txflags, pos);
352 pos += 2;
353
354 /* IEEE80211_RADIOTAP_DATA_RETRIES */
355 /* for now report the total retry_count */
356 *pos = retry_count;
357 pos++;
358
359 if (status && status->rate &&
360 (status->rate->flags & RATE_INFO_FLAGS_MCS)) {
361 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
362 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
363 IEEE80211_RADIOTAP_MCS_HAVE_GI |
364 IEEE80211_RADIOTAP_MCS_HAVE_BW;
365 if (status->rate->flags & RATE_INFO_FLAGS_SHORT_GI)
366 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
367 if (status->rate->bw == RATE_INFO_BW_40)
368 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
369 pos[2] = status->rate->mcs;
370 pos += 3;
371 } else if (status && status->rate &&
372 (status->rate->flags & RATE_INFO_FLAGS_VHT_MCS)) {
373 u16 known = local->hw.radiotap_vht_details &
374 (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
375 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
376
377 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
378
379 /* required alignment from rthdr */
380 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
381
382 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
383 put_unaligned_le16(known, pos);
384 pos += 2;
385
386 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
387 if (status->rate->flags & RATE_INFO_FLAGS_SHORT_GI)
388 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
389 pos++;
390
391 /* u8 bandwidth */
392 switch (status->rate->bw) {
393 case RATE_INFO_BW_160:
394 *pos = 11;
395 break;
396 case RATE_INFO_BW_80:
397 *pos = 4;
398 break;
399 case RATE_INFO_BW_40:
400 *pos = 1;
401 break;
402 default:
403 *pos = 0;
404 break;
405 }
406 pos++;
407
408 /* u8 mcs_nss[4] */
409 *pos = (status->rate->mcs << 4) | status->rate->nss;
410 pos += 4;
411
412 /* u8 coding */
413 pos++;
414 /* u8 group_id */
415 pos++;
416 /* u16 partial_aid */
417 pos += 2;
418 } else if (status && status->rate &&
419 (status->rate->flags & RATE_INFO_FLAGS_HE_MCS)) {
420 struct ieee80211_radiotap_he *he;
421
422 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
423
424 /* required alignment from rthdr */
425 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
426 he = (struct ieee80211_radiotap_he *)pos;
427
428 he->data1 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA1_FORMAT_SU |
429 IEEE80211_RADIOTAP_HE_DATA1_DATA_MCS_KNOWN |
430 IEEE80211_RADIOTAP_HE_DATA1_DATA_DCM_KNOWN |
431 IEEE80211_RADIOTAP_HE_DATA1_BW_RU_ALLOC_KNOWN);
432
433 he->data2 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA2_GI_KNOWN);
434
435#define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
436
437 he->data6 |= HE_PREP(DATA6_NSTS, status->rate->nss);
438
439#define CHECK_GI(s) \
440 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
441 (int)NL80211_RATE_INFO_HE_GI_##s)
442
443 CHECK_GI(0_8);
444 CHECK_GI(1_6);
445 CHECK_GI(3_2);
446
447 he->data3 |= HE_PREP(DATA3_DATA_MCS, status->rate->mcs);
448 he->data3 |= HE_PREP(DATA3_DATA_DCM, status->rate->he_dcm);
449
450 he->data5 |= HE_PREP(DATA5_GI, status->rate->he_gi);
451
452 switch (status->rate->bw) {
453 case RATE_INFO_BW_20:
454 he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
455 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
456 break;
457 case RATE_INFO_BW_40:
458 he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
459 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
460 break;
461 case RATE_INFO_BW_80:
462 he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
463 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
464 break;
465 case RATE_INFO_BW_160:
466 he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
467 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
468 break;
469 case RATE_INFO_BW_HE_RU:
470#define CHECK_RU_ALLOC(s) \
471 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
472 NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
473
474 CHECK_RU_ALLOC(26);
475 CHECK_RU_ALLOC(52);
476 CHECK_RU_ALLOC(106);
477 CHECK_RU_ALLOC(242);
478 CHECK_RU_ALLOC(484);
479 CHECK_RU_ALLOC(996);
480 CHECK_RU_ALLOC(2x996);
481
482 he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
483 status->rate->he_ru_alloc + 4);
484 break;
485 default:
486 WARN_ONCE(1, "Invalid SU BW %d\n", status->rate->bw);
487 }
488
489 pos += sizeof(struct ieee80211_radiotap_he);
490 }
491
492 if ((status && status->rate) || info->status.rates[0].idx < 0)
493 return;
494
495 /* IEEE80211_RADIOTAP_MCS
496 * IEEE80211_RADIOTAP_VHT */
497 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
498 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
499 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
500 IEEE80211_RADIOTAP_MCS_HAVE_GI |
501 IEEE80211_RADIOTAP_MCS_HAVE_BW;
502 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
503 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
504 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
505 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
506 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
507 pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
508 pos[2] = info->status.rates[0].idx;
509 pos += 3;
510 } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
511 u16 known = local->hw.radiotap_vht_details &
512 (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
513 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
514
515 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
516
517 /* required alignment from rthdr */
518 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
519
520 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
521 put_unaligned_le16(known, pos);
522 pos += 2;
523
524 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
525 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
526 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
527 pos++;
528
529 /* u8 bandwidth */
530 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
531 *pos = 1;
532 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
533 *pos = 4;
534 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
535 *pos = 11;
536 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
537 *pos = 0;
538 pos++;
539
540 /* u8 mcs_nss[4] */
541 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
542 ieee80211_rate_get_vht_nss(&info->status.rates[0]);
543 pos += 4;
544
545 /* u8 coding */
546 pos++;
547 /* u8 group_id */
548 pos++;
549 /* u16 partial_aid */
550 pos += 2;
551 }
552}
553
554/*
555 * Handles the tx for TDLS teardown frames.
556 * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
557 */
558static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
559 struct ieee80211_sub_if_data *sdata,
560 struct sk_buff *skb, u32 flags)
561{
562 struct sk_buff *teardown_skb;
563 struct sk_buff *orig_teardown_skb;
564 bool is_teardown = false;
565
566 /* Get the teardown data we need and free the lock */
567 spin_lock(&sdata->u.mgd.teardown_lock);
568 teardown_skb = sdata->u.mgd.teardown_skb;
569 orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
570 if ((skb == orig_teardown_skb) && teardown_skb) {
571 sdata->u.mgd.teardown_skb = NULL;
572 sdata->u.mgd.orig_teardown_skb = NULL;
573 is_teardown = true;
574 }
575 spin_unlock(&sdata->u.mgd.teardown_lock);
576
577 if (is_teardown) {
578 /* This mechanism relies on being able to get ACKs */
579 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
580
581 /* Check if peer has ACKed */
582 if (flags & IEEE80211_TX_STAT_ACK) {
583 dev_kfree_skb_any(teardown_skb);
584 } else {
585 tdls_dbg(sdata,
586 "TDLS Resending teardown through AP\n");
587
588 ieee80211_subif_start_xmit(teardown_skb, skb->dev);
589 }
590 }
591}
592
593static struct ieee80211_sub_if_data *
594ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
595{
596 struct ieee80211_sub_if_data *sdata;
597
598 if (skb->dev) {
599 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
600 if (!sdata->dev)
601 continue;
602
603 if (skb->dev == sdata->dev)
604 return sdata;
605 }
606
607 return NULL;
608 }
609
610 return rcu_dereference(local->p2p_sdata);
611}
612
613static void ieee80211_report_ack_skb(struct ieee80211_local *local,
614 struct ieee80211_tx_info *info,
615 bool acked, bool dropped)
616{
617 struct sk_buff *skb;
618 unsigned long flags;
619
620 spin_lock_irqsave(&local->ack_status_lock, flags);
621 skb = idr_remove(&local->ack_status_frames, info->ack_frame_id);
622 spin_unlock_irqrestore(&local->ack_status_lock, flags);
623
624 if (!skb)
625 return;
626
627 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
628 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
629 struct ieee80211_sub_if_data *sdata;
630 struct ieee80211_hdr *hdr = (void *)skb->data;
631
632 rcu_read_lock();
633 sdata = ieee80211_sdata_from_skb(local, skb);
634 if (sdata) {
635 if (skb->protocol == sdata->control_port_protocol ||
636 skb->protocol == cpu_to_be16(ETH_P_PREAUTH))
637 cfg80211_control_port_tx_status(&sdata->wdev,
638 cookie,
639 skb->data,
640 skb->len,
641 acked,
642 GFP_ATOMIC);
643 else if (ieee80211_is_any_nullfunc(hdr->frame_control))
644 cfg80211_probe_status(sdata->dev, hdr->addr1,
645 cookie, acked,
646 info->status.ack_signal,
647 info->status.is_valid_ack_signal,
648 GFP_ATOMIC);
649 else if (ieee80211_is_mgmt(hdr->frame_control))
650 cfg80211_mgmt_tx_status(&sdata->wdev, cookie,
651 skb->data, skb->len,
652 acked, GFP_ATOMIC);
653 else
654 pr_warn("Unknown status report in ack skb\n");
655
656 }
657 rcu_read_unlock();
658
659 dev_kfree_skb_any(skb);
660 } else if (dropped) {
661 dev_kfree_skb_any(skb);
662 } else {
663 /* consumes skb */
664 skb_complete_wifi_ack(skb, acked);
665 }
666}
667
668static void ieee80211_report_used_skb(struct ieee80211_local *local,
669 struct sk_buff *skb, bool dropped)
670{
671 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
672 u16 tx_time_est = ieee80211_info_get_tx_time_est(info);
673 struct ieee80211_hdr *hdr = (void *)skb->data;
674 bool acked = info->flags & IEEE80211_TX_STAT_ACK;
675
676 if (dropped)
677 acked = false;
678
679 if (tx_time_est) {
680 struct sta_info *sta;
681
682 rcu_read_lock();
683
684 sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
685 ieee80211_sta_update_pending_airtime(local, sta,
686 skb_get_queue_mapping(skb),
687 tx_time_est,
688 true);
689 rcu_read_unlock();
690 }
691
692 if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
693 struct ieee80211_sub_if_data *sdata;
694
695 rcu_read_lock();
696
697 sdata = ieee80211_sdata_from_skb(local, skb);
698
699 if (!sdata) {
700 skb->dev = NULL;
701 } else {
702 unsigned int hdr_size =
703 ieee80211_hdrlen(hdr->frame_control);
704
705 /* Check to see if packet is a TDLS teardown packet */
706 if (ieee80211_is_data(hdr->frame_control) &&
707 (ieee80211_get_tdls_action(skb, hdr_size) ==
708 WLAN_TDLS_TEARDOWN))
709 ieee80211_tdls_td_tx_handle(local, sdata, skb,
710 info->flags);
711 else
712 ieee80211_mgd_conn_tx_status(sdata,
713 hdr->frame_control,
714 acked);
715 }
716
717 rcu_read_unlock();
718 } else if (info->ack_frame_id) {
719 ieee80211_report_ack_skb(local, info, acked, dropped);
720 }
721
722 if (!dropped && skb->destructor) {
723 skb->wifi_acked_valid = 1;
724 skb->wifi_acked = acked;
725 }
726
727 ieee80211_led_tx(local);
728
729 if (skb_has_frag_list(skb)) {
730 kfree_skb_list(skb_shinfo(skb)->frag_list);
731 skb_shinfo(skb)->frag_list = NULL;
732 }
733}
734
735/*
736 * Use a static threshold for now, best value to be determined
737 * by testing ...
738 * Should it depend on:
739 * - on # of retransmissions
740 * - current throughput (higher value for higher tpt)?
741 */
742#define STA_LOST_PKT_THRESHOLD 50
743#define STA_LOST_PKT_TIME HZ /* 1 sec since last ACK */
744#define STA_LOST_TDLS_PKT_THRESHOLD 10
745#define STA_LOST_TDLS_PKT_TIME (10*HZ) /* 10secs since last ACK */
746
747static void ieee80211_lost_packet(struct sta_info *sta,
748 struct ieee80211_tx_info *info)
749{
750 unsigned long pkt_time = STA_LOST_PKT_TIME;
751 unsigned int pkt_thr = STA_LOST_PKT_THRESHOLD;
752
753 /* If driver relies on its own algorithm for station kickout, skip
754 * mac80211 packet loss mechanism.
755 */
756 if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
757 return;
758
759 /* This packet was aggregated but doesn't carry status info */
760 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
761 !(info->flags & IEEE80211_TX_STAT_AMPDU))
762 return;
763
764 sta->status_stats.lost_packets++;
765 if (sta->sta.tdls) {
766 pkt_time = STA_LOST_TDLS_PKT_TIME;
767 pkt_thr = STA_LOST_PKT_THRESHOLD;
768 }
769
770 /*
771 * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD
772 * of the last packets were lost, and that no ACK was received in the
773 * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
774 * mechanism.
775 * For non-TDLS, use STA_LOST_PKT_THRESHOLD and STA_LOST_PKT_TIME
776 */
777 if (sta->status_stats.lost_packets < pkt_thr ||
778 !time_after(jiffies, sta->status_stats.last_pkt_time + pkt_time))
779 return;
780
781 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
782 sta->status_stats.lost_packets, GFP_ATOMIC);
783 sta->status_stats.lost_packets = 0;
784}
785
786static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
787 struct ieee80211_tx_info *info,
788 int *retry_count)
789{
790 int count = -1;
791 int i;
792
793 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
794 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
795 !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
796 /* just the first aggr frame carry status info */
797 info->status.rates[i].idx = -1;
798 info->status.rates[i].count = 0;
799 break;
800 } else if (info->status.rates[i].idx < 0) {
801 break;
802 } else if (i >= hw->max_report_rates) {
803 /* the HW cannot have attempted that rate */
804 info->status.rates[i].idx = -1;
805 info->status.rates[i].count = 0;
806 break;
807 }
808
809 count += info->status.rates[i].count;
810 }
811
812 if (count < 0)
813 count = 0;
814
815 *retry_count = count;
816 return i - 1;
817}
818
819void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
820 struct ieee80211_supported_band *sband,
821 int retry_count, int shift, bool send_to_cooked,
822 struct ieee80211_tx_status *status)
823{
824 struct sk_buff *skb2;
825 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
826 struct ieee80211_sub_if_data *sdata;
827 struct net_device *prev_dev = NULL;
828 int rtap_len;
829
830 /* send frame to monitor interfaces now */
831 rtap_len = ieee80211_tx_radiotap_len(info, status);
832 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
833 pr_err("ieee80211_tx_status: headroom too small\n");
834 dev_kfree_skb(skb);
835 return;
836 }
837 ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
838 rtap_len, shift, status);
839
840 /* XXX: is this sufficient for BPF? */
841 skb_reset_mac_header(skb);
842 skb->ip_summed = CHECKSUM_UNNECESSARY;
843 skb->pkt_type = PACKET_OTHERHOST;
844 skb->protocol = htons(ETH_P_802_2);
845 memset(skb->cb, 0, sizeof(skb->cb));
846
847 rcu_read_lock();
848 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
849 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
850 if (!ieee80211_sdata_running(sdata))
851 continue;
852
853 if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
854 !send_to_cooked)
855 continue;
856
857 if (prev_dev) {
858 skb2 = skb_clone(skb, GFP_ATOMIC);
859 if (skb2) {
860 skb2->dev = prev_dev;
861 netif_rx(skb2);
862 }
863 }
864
865 prev_dev = sdata->dev;
866 }
867 }
868 if (prev_dev) {
869 skb->dev = prev_dev;
870 netif_rx(skb);
871 skb = NULL;
872 }
873 rcu_read_unlock();
874 dev_kfree_skb(skb);
875}
876
877static void __ieee80211_tx_status(struct ieee80211_hw *hw,
878 struct ieee80211_tx_status *status,
879 int rates_idx, int retry_count)
880{
881 struct sk_buff *skb = status->skb;
882 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
883 struct ieee80211_local *local = hw_to_local(hw);
884 struct ieee80211_tx_info *info = status->info;
885 struct sta_info *sta;
886 __le16 fc;
887 struct ieee80211_supported_band *sband;
888 bool send_to_cooked;
889 bool acked;
890 bool noack_success;
891 struct ieee80211_bar *bar;
892 int shift = 0;
893 int tid = IEEE80211_NUM_TIDS;
894
895 sband = local->hw.wiphy->bands[info->band];
896 fc = hdr->frame_control;
897
898 if (status->sta) {
899 sta = container_of(status->sta, struct sta_info, sta);
900 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
901
902 if (info->flags & IEEE80211_TX_STATUS_EOSP)
903 clear_sta_flag(sta, WLAN_STA_SP);
904
905 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
906 noack_success = !!(info->flags &
907 IEEE80211_TX_STAT_NOACK_TRANSMITTED);
908
909 /* mesh Peer Service Period support */
910 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
911 ieee80211_is_data_qos(fc))
912 ieee80211_mpsp_trigger_process(
913 ieee80211_get_qos_ctl(hdr), sta, true, acked);
914
915 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
916 (ieee80211_is_data(hdr->frame_control)) &&
917 (rates_idx != -1))
918 sta->tx_stats.last_rate =
919 info->status.rates[rates_idx];
920
921 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
922 (ieee80211_is_data_qos(fc))) {
923 u16 ssn;
924 u8 *qc;
925
926 qc = ieee80211_get_qos_ctl(hdr);
927 tid = qc[0] & 0xf;
928 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
929 & IEEE80211_SCTL_SEQ);
930 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
931 tid, ssn);
932 } else if (ieee80211_is_data_qos(fc)) {
933 u8 *qc = ieee80211_get_qos_ctl(hdr);
934
935 tid = qc[0] & 0xf;
936 }
937
938 if (!acked && ieee80211_is_back_req(fc)) {
939 u16 control;
940
941 /*
942 * BAR failed, store the last SSN and retry sending
943 * the BAR when the next unicast transmission on the
944 * same TID succeeds.
945 */
946 bar = (struct ieee80211_bar *) skb->data;
947 control = le16_to_cpu(bar->control);
948 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
949 u16 ssn = le16_to_cpu(bar->start_seq_num);
950
951 tid = (control &
952 IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
953 IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
954
955 ieee80211_set_bar_pending(sta, tid, ssn);
956 }
957 }
958
959 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
960 ieee80211_handle_filtered_frame(local, sta, skb);
961 return;
962 } else if (ieee80211_is_data_present(fc)) {
963 if (!acked && !noack_success)
964 sta->status_stats.msdu_failed[tid]++;
965
966 sta->status_stats.msdu_retries[tid] +=
967 retry_count;
968 }
969
970 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
971 ieee80211_frame_acked(sta, skb);
972
973 } else if (wiphy_ext_feature_isset(local->hw.wiphy,
974 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) {
975 struct ieee80211_sub_if_data *sdata;
976 struct ieee80211_txq *txq;
977 u32 airtime;
978
979 /* Account airtime to multicast queue */
980 sdata = ieee80211_sdata_from_skb(local, skb);
981
982 if (sdata && (txq = sdata->vif.txq)) {
983 airtime = info->status.tx_time ?:
984 ieee80211_calc_expected_tx_airtime(hw,
985 &sdata->vif,
986 NULL,
987 skb->len,
988 false);
989
990 ieee80211_register_airtime(txq, airtime, 0);
991 }
992 }
993
994 /* SNMP counters
995 * Fragments are passed to low-level drivers as separate skbs, so these
996 * are actually fragments, not frames. Update frame counters only for
997 * the first fragment of the frame. */
998 if ((info->flags & IEEE80211_TX_STAT_ACK) ||
999 (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
1000 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
1001 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1002 if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
1003 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1004 if (retry_count > 0)
1005 I802_DEBUG_INC(local->dot11RetryCount);
1006 if (retry_count > 1)
1007 I802_DEBUG_INC(local->dot11MultipleRetryCount);
1008 }
1009
1010 /* This counter shall be incremented for an acknowledged MPDU
1011 * with an individual address in the address 1 field or an MPDU
1012 * with a multicast address in the address 1 field of type Data
1013 * or Management. */
1014 if (!is_multicast_ether_addr(hdr->addr1) ||
1015 ieee80211_is_data(fc) ||
1016 ieee80211_is_mgmt(fc))
1017 I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
1018 } else {
1019 if (ieee80211_is_first_frag(hdr->seq_ctrl))
1020 I802_DEBUG_INC(local->dot11FailedCount);
1021 }
1022
1023 if (ieee80211_is_any_nullfunc(fc) &&
1024 ieee80211_has_pm(fc) &&
1025 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1026 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
1027 local->ps_sdata && !(local->scanning)) {
1028 if (info->flags & IEEE80211_TX_STAT_ACK)
1029 local->ps_sdata->u.mgd.flags |=
1030 IEEE80211_STA_NULLFUNC_ACKED;
1031 mod_timer(&local->dynamic_ps_timer,
1032 jiffies + msecs_to_jiffies(10));
1033 }
1034
1035 ieee80211_report_used_skb(local, skb, false);
1036
1037 /* this was a transmitted frame, but now we want to reuse it */
1038 skb_orphan(skb);
1039
1040 /* Need to make a copy before skb->cb gets cleared */
1041 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
1042 !(ieee80211_is_data(fc));
1043
1044 /*
1045 * This is a bit racy but we can avoid a lot of work
1046 * with this test...
1047 */
1048 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
1049 if (status->free_list)
1050 list_add_tail(&skb->list, status->free_list);
1051 else
1052 dev_kfree_skb(skb);
1053 return;
1054 }
1055
1056 /* send to monitor interfaces */
1057 ieee80211_tx_monitor(local, skb, sband, retry_count, shift,
1058 send_to_cooked, status);
1059}
1060
1061void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1062{
1063 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1064 struct ieee80211_local *local = hw_to_local(hw);
1065 struct ieee80211_tx_status status = {
1066 .skb = skb,
1067 .info = IEEE80211_SKB_CB(skb),
1068 };
1069 struct sta_info *sta;
1070
1071 rcu_read_lock();
1072
1073 sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
1074 if (sta)
1075 status.sta = &sta->sta;
1076
1077 ieee80211_tx_status_ext(hw, &status);
1078 rcu_read_unlock();
1079}
1080EXPORT_SYMBOL(ieee80211_tx_status);
1081
1082void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
1083 struct ieee80211_tx_status *status)
1084{
1085 struct ieee80211_local *local = hw_to_local(hw);
1086 struct ieee80211_tx_info *info = status->info;
1087 struct ieee80211_sta *pubsta = status->sta;
1088 struct sk_buff *skb = status->skb;
1089 struct ieee80211_supported_band *sband;
1090 struct sta_info *sta = NULL;
1091 int rates_idx, retry_count;
1092 bool acked, noack_success;
1093 u16 tx_time_est;
1094
1095 if (pubsta) {
1096 sta = container_of(pubsta, struct sta_info, sta);
1097
1098 if (status->rate)
1099 sta->tx_stats.last_rate_info = *status->rate;
1100 }
1101
1102 if (skb && (tx_time_est =
1103 ieee80211_info_get_tx_time_est(IEEE80211_SKB_CB(skb))) > 0) {
1104 /* Do this here to avoid the expensive lookup of the sta
1105 * in ieee80211_report_used_skb().
1106 */
1107 ieee80211_sta_update_pending_airtime(local, sta,
1108 skb_get_queue_mapping(skb),
1109 tx_time_est,
1110 true);
1111 ieee80211_info_set_tx_time_est(IEEE80211_SKB_CB(skb), 0);
1112 }
1113
1114 if (!status->info)
1115 goto free;
1116
1117 rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
1118
1119 sband = hw->wiphy->bands[info->band];
1120
1121 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
1122 noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
1123
1124 if (pubsta) {
1125 struct ieee80211_sub_if_data *sdata = sta->sdata;
1126
1127 if (!acked && !noack_success)
1128 sta->status_stats.retry_failed++;
1129 sta->status_stats.retry_count += retry_count;
1130
1131 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
1132 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1133 skb && !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP))
1134 ieee80211_sta_tx_notify(sdata, (void *) skb->data,
1135 acked, info->status.tx_time);
1136
1137 if (acked) {
1138 sta->status_stats.last_ack = jiffies;
1139
1140 if (sta->status_stats.lost_packets)
1141 sta->status_stats.lost_packets = 0;
1142
1143 /* Track when last packet was ACKed */
1144 sta->status_stats.last_pkt_time = jiffies;
1145
1146 /* Reset connection monitor */
1147 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1148 unlikely(sdata->u.mgd.probe_send_count > 0))
1149 sdata->u.mgd.probe_send_count = 0;
1150
1151 if (info->status.is_valid_ack_signal) {
1152 sta->status_stats.last_ack_signal =
1153 (s8)info->status.ack_signal;
1154 sta->status_stats.ack_signal_filled = true;
1155 ewma_avg_signal_add(&sta->status_stats.avg_ack_signal,
1156 -info->status.ack_signal);
1157 }
1158 } else if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1159 /*
1160 * The STA is in power save mode, so assume
1161 * that this TX packet failed because of that.
1162 */
1163 if (skb)
1164 ieee80211_handle_filtered_frame(local, sta, skb);
1165 return;
1166 } else if (noack_success) {
1167 /* nothing to do here, do not account as lost */
1168 } else {
1169 ieee80211_lost_packet(sta, info);
1170 }
1171 }
1172
1173 rate_control_tx_status(local, sband, status);
1174 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
1175 ieee80211s_update_metric(local, sta, status);
1176 }
1177
1178 if (skb && !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP))
1179 return __ieee80211_tx_status(hw, status, rates_idx,
1180 retry_count);
1181
1182 if (acked || noack_success) {
1183 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1184 if (!pubsta)
1185 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1186 if (retry_count > 0)
1187 I802_DEBUG_INC(local->dot11RetryCount);
1188 if (retry_count > 1)
1189 I802_DEBUG_INC(local->dot11MultipleRetryCount);
1190 } else {
1191 I802_DEBUG_INC(local->dot11FailedCount);
1192 }
1193
1194free:
1195 if (!skb)
1196 return;
1197
1198 ieee80211_report_used_skb(local, skb, false);
1199 if (status->free_list)
1200 list_add_tail(&skb->list, status->free_list);
1201 else
1202 dev_kfree_skb(skb);
1203}
1204EXPORT_SYMBOL(ieee80211_tx_status_ext);
1205
1206void ieee80211_tx_rate_update(struct ieee80211_hw *hw,
1207 struct ieee80211_sta *pubsta,
1208 struct ieee80211_tx_info *info)
1209{
1210 struct ieee80211_local *local = hw_to_local(hw);
1211 struct ieee80211_supported_band *sband = hw->wiphy->bands[info->band];
1212 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1213 struct ieee80211_tx_status status = {
1214 .info = info,
1215 .sta = pubsta,
1216 };
1217
1218 rate_control_tx_status(local, sband, &status);
1219
1220 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
1221 sta->tx_stats.last_rate = info->status.rates[0];
1222}
1223EXPORT_SYMBOL(ieee80211_tx_rate_update);
1224
1225void ieee80211_tx_status_8023(struct ieee80211_hw *hw,
1226 struct ieee80211_vif *vif,
1227 struct sk_buff *skb)
1228{
1229 struct ieee80211_sub_if_data *sdata;
1230 struct ieee80211_tx_status status = {
1231 .skb = skb,
1232 .info = IEEE80211_SKB_CB(skb),
1233 };
1234 struct sta_info *sta;
1235
1236 sdata = vif_to_sdata(vif);
1237
1238 rcu_read_lock();
1239
1240 if (!ieee80211_lookup_ra_sta(sdata, skb, &sta) && !IS_ERR(sta))
1241 status.sta = &sta->sta;
1242
1243 ieee80211_tx_status_ext(hw, &status);
1244
1245 rcu_read_unlock();
1246}
1247EXPORT_SYMBOL(ieee80211_tx_status_8023);
1248
1249void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
1250{
1251 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1252 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
1253 num_packets, GFP_ATOMIC);
1254}
1255EXPORT_SYMBOL(ieee80211_report_low_ack);
1256
1257void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
1258{
1259 struct ieee80211_local *local = hw_to_local(hw);
1260
1261 ieee80211_report_used_skb(local, skb, true);
1262 dev_kfree_skb_any(skb);
1263}
1264EXPORT_SYMBOL(ieee80211_free_txskb);
1265
1266void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
1267 struct sk_buff_head *skbs)
1268{
1269 struct sk_buff *skb;
1270
1271 while ((skb = __skb_dequeue(skbs)))
1272 ieee80211_free_txskb(hw, skb);
1273}
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}