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 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12 #include <linux/export.h>
13 #include <net/mac80211.h>
14 #include "ieee80211_i.h"
15 #include "rate.h"
16 #include "mesh.h"
17 #include "led.h"
18 #include "wme.h"
19
20
ieee80211_tx_status_irqsafe(struct ieee80211_hw * hw,struct sk_buff * skb)21 void 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 dev_kfree_skb_irq(skb);
36 tmp--;
37 I802_DEBUG_INC(local->tx_status_drop);
38 }
39 tasklet_schedule(&local->tasklet);
40 }
41 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
42
ieee80211_handle_filtered_frame(struct ieee80211_local * local,struct sta_info * sta,struct sk_buff * skb)43 static 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 /*
52 * This skb 'survived' a round-trip through the driver, and
53 * hopefully the driver didn't mangle it too badly. However,
54 * we can definitely not rely on the control information
55 * being correct. Clear it so we don't get junk there, and
56 * indicate that it needs new processing, but must not be
57 * modified/encrypted again.
58 */
59 memset(&info->control, 0, sizeof(info->control));
60
61 info->control.jiffies = jiffies;
62 info->control.vif = &sta->sdata->vif;
63 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
64 IEEE80211_TX_INTFL_RETRANSMISSION;
65 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
66
67 sta->tx_filtered_count++;
68
69 /*
70 * Clear more-data bit on filtered frames, it might be set
71 * but later frames might time out so it might have to be
72 * clear again ... It's all rather unlikely (this frame
73 * should time out first, right?) but let's not confuse
74 * peers unnecessarily.
75 */
76 if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
77 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
78
79 if (ieee80211_is_data_qos(hdr->frame_control)) {
80 u8 *p = ieee80211_get_qos_ctl(hdr);
81 int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
82
83 /*
84 * Clear EOSP if set, this could happen e.g.
85 * if an absence period (us being a P2P GO)
86 * shortens the SP.
87 */
88 if (*p & IEEE80211_QOS_CTL_EOSP)
89 *p &= ~IEEE80211_QOS_CTL_EOSP;
90 ac = ieee802_1d_to_ac[tid & 7];
91 } else {
92 ac = IEEE80211_AC_BE;
93 }
94
95 /*
96 * Clear the TX filter mask for this STA when sending the next
97 * packet. If the STA went to power save mode, this will happen
98 * when it wakes up for the next time.
99 */
100 set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
101
102 /*
103 * This code races in the following way:
104 *
105 * (1) STA sends frame indicating it will go to sleep and does so
106 * (2) hardware/firmware adds STA to filter list, passes frame up
107 * (3) hardware/firmware processes TX fifo and suppresses a frame
108 * (4) we get TX status before having processed the frame and
109 * knowing that the STA has gone to sleep.
110 *
111 * This is actually quite unlikely even when both those events are
112 * processed from interrupts coming in quickly after one another or
113 * even at the same time because we queue both TX status events and
114 * RX frames to be processed by a tasklet and process them in the
115 * same order that they were received or TX status last. Hence, there
116 * is no race as long as the frame RX is processed before the next TX
117 * status, which drivers can ensure, see below.
118 *
119 * Note that this can only happen if the hardware or firmware can
120 * actually add STAs to the filter list, if this is done by the
121 * driver in response to set_tim() (which will only reduce the race
122 * this whole filtering tries to solve, not completely solve it)
123 * this situation cannot happen.
124 *
125 * To completely solve this race drivers need to make sure that they
126 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
127 * functions and
128 * (b) always process RX events before TX status events if ordering
129 * can be unknown, for example with different interrupt status
130 * bits.
131 * (c) if PS mode transitions are manual (i.e. the flag
132 * %IEEE80211_HW_AP_LINK_PS is set), always process PS state
133 * changes before calling TX status events if ordering can be
134 * unknown.
135 */
136 if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
137 skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
138 skb_queue_tail(&sta->tx_filtered[ac], skb);
139 sta_info_recalc_tim(sta);
140
141 if (!timer_pending(&local->sta_cleanup))
142 mod_timer(&local->sta_cleanup,
143 round_jiffies(jiffies +
144 STA_INFO_CLEANUP_INTERVAL));
145 return;
146 }
147
148 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
149 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
150 /* Software retry the packet once */
151 info->flags |= IEEE80211_TX_INTFL_RETRIED;
152 ieee80211_add_pending_skb(local, skb);
153 return;
154 }
155
156 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
157 if (net_ratelimit())
158 wiphy_debug(local->hw.wiphy,
159 "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
160 skb_queue_len(&sta->tx_filtered[ac]),
161 !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
162 #endif
163 dev_kfree_skb(skb);
164 }
165
ieee80211_check_pending_bar(struct sta_info * sta,u8 * addr,u8 tid)166 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
167 {
168 struct tid_ampdu_tx *tid_tx;
169
170 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
171 if (!tid_tx || !tid_tx->bar_pending)
172 return;
173
174 tid_tx->bar_pending = false;
175 ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
176 }
177
ieee80211_frame_acked(struct sta_info * sta,struct sk_buff * skb)178 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
179 {
180 struct ieee80211_mgmt *mgmt = (void *) skb->data;
181 struct ieee80211_local *local = sta->local;
182 struct ieee80211_sub_if_data *sdata = sta->sdata;
183
184 if (ieee80211_is_data_qos(mgmt->frame_control)) {
185 struct ieee80211_hdr *hdr = (void *) skb->data;
186 u8 *qc = ieee80211_get_qos_ctl(hdr);
187 u16 tid = qc[0] & 0xf;
188
189 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
190 }
191
192 if (ieee80211_is_action(mgmt->frame_control) &&
193 sdata->vif.type == NL80211_IFTYPE_STATION &&
194 mgmt->u.action.category == WLAN_CATEGORY_HT &&
195 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS) {
196 /*
197 * This update looks racy, but isn't -- if we come
198 * here we've definitely got a station that we're
199 * talking to, and on a managed interface that can
200 * only be the AP. And the only other place updating
201 * this variable is before we're associated.
202 */
203 switch (mgmt->u.action.u.ht_smps.smps_control) {
204 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
205 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_DYNAMIC;
206 break;
207 case WLAN_HT_SMPS_CONTROL_STATIC:
208 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_STATIC;
209 break;
210 case WLAN_HT_SMPS_CONTROL_DISABLED:
211 default: /* shouldn't happen since we don't send that */
212 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_OFF;
213 break;
214 }
215
216 ieee80211_queue_work(&local->hw, &local->recalc_smps);
217 }
218 }
219
ieee80211_set_bar_pending(struct sta_info * sta,u8 tid,u16 ssn)220 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
221 {
222 struct tid_ampdu_tx *tid_tx;
223
224 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
225 if (!tid_tx)
226 return;
227
228 tid_tx->failed_bar_ssn = ssn;
229 tid_tx->bar_pending = true;
230 }
231
ieee80211_tx_radiotap_len(struct ieee80211_tx_info * info)232 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info)
233 {
234 int len = sizeof(struct ieee80211_radiotap_header);
235
236 /* IEEE80211_RADIOTAP_RATE rate */
237 if (info->status.rates[0].idx >= 0 &&
238 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
239 len += 2;
240
241 /* IEEE80211_RADIOTAP_TX_FLAGS */
242 len += 2;
243
244 /* IEEE80211_RADIOTAP_DATA_RETRIES */
245 len += 1;
246
247 /* IEEE80211_TX_RC_MCS */
248 if (info->status.rates[0].idx >= 0 &&
249 info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
250 len += 3;
251
252 return len;
253 }
254
ieee80211_add_tx_radiotap_header(struct ieee80211_supported_band * sband,struct sk_buff * skb,int retry_count,int rtap_len)255 static void ieee80211_add_tx_radiotap_header(struct ieee80211_supported_band
256 *sband, struct sk_buff *skb,
257 int retry_count, int rtap_len)
258 {
259 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
260 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
261 struct ieee80211_radiotap_header *rthdr;
262 unsigned char *pos;
263 u16 txflags;
264
265 rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len);
266
267 memset(rthdr, 0, rtap_len);
268 rthdr->it_len = cpu_to_le16(rtap_len);
269 rthdr->it_present =
270 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
271 (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
272 pos = (unsigned char *)(rthdr + 1);
273
274 /*
275 * XXX: Once radiotap gets the bitmap reset thing the vendor
276 * extensions proposal contains, we can actually report
277 * the whole set of tries we did.
278 */
279
280 /* IEEE80211_RADIOTAP_RATE */
281 if (info->status.rates[0].idx >= 0 &&
282 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) {
283 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
284 *pos = sband->bitrates[info->status.rates[0].idx].bitrate / 5;
285 /* padding for tx flags */
286 pos += 2;
287 }
288
289 /* IEEE80211_RADIOTAP_TX_FLAGS */
290 txflags = 0;
291 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
292 !is_multicast_ether_addr(hdr->addr1))
293 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
294
295 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
296 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
297 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
298 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
299 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
300
301 put_unaligned_le16(txflags, pos);
302 pos += 2;
303
304 /* IEEE80211_RADIOTAP_DATA_RETRIES */
305 /* for now report the total retry_count */
306 *pos = retry_count;
307 pos++;
308
309 /* IEEE80211_TX_RC_MCS */
310 if (info->status.rates[0].idx >= 0 &&
311 info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
312 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
313 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
314 IEEE80211_RADIOTAP_MCS_HAVE_GI |
315 IEEE80211_RADIOTAP_MCS_HAVE_BW;
316 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
317 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
318 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
319 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
320 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
321 pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
322 pos[2] = info->status.rates[0].idx;
323 pos += 3;
324 }
325
326 }
327
328 /*
329 * Use a static threshold for now, best value to be determined
330 * by testing ...
331 * Should it depend on:
332 * - on # of retransmissions
333 * - current throughput (higher value for higher tpt)?
334 */
335 #define STA_LOST_PKT_THRESHOLD 50
336
ieee80211_tx_status(struct ieee80211_hw * hw,struct sk_buff * skb)337 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
338 {
339 struct sk_buff *skb2;
340 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
341 struct ieee80211_local *local = hw_to_local(hw);
342 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
343 __le16 fc;
344 struct ieee80211_supported_band *sband;
345 struct ieee80211_sub_if_data *sdata;
346 struct net_device *prev_dev = NULL;
347 struct sta_info *sta, *tmp;
348 int retry_count = -1, i;
349 int rates_idx = -1;
350 bool send_to_cooked;
351 bool acked;
352 struct ieee80211_bar *bar;
353 u16 tid;
354 int rtap_len;
355
356 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
357 if (info->status.rates[i].idx < 0) {
358 break;
359 } else if (i >= hw->max_report_rates) {
360 /* the HW cannot have attempted that rate */
361 info->status.rates[i].idx = -1;
362 info->status.rates[i].count = 0;
363 break;
364 }
365
366 retry_count += info->status.rates[i].count;
367 }
368 rates_idx = i - 1;
369
370 if (retry_count < 0)
371 retry_count = 0;
372
373 rcu_read_lock();
374
375 sband = local->hw.wiphy->bands[info->band];
376 fc = hdr->frame_control;
377
378 for_each_sta_info(local, hdr->addr1, sta, tmp) {
379 /* skip wrong virtual interface */
380 if (memcmp(hdr->addr2, sta->sdata->vif.addr, ETH_ALEN))
381 continue;
382
383 if (info->flags & IEEE80211_TX_STATUS_EOSP)
384 clear_sta_flag(sta, WLAN_STA_SP);
385
386 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
387 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
388 /*
389 * The STA is in power save mode, so assume
390 * that this TX packet failed because of that.
391 */
392 ieee80211_handle_filtered_frame(local, sta, skb);
393 rcu_read_unlock();
394 return;
395 }
396
397 if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) &&
398 (rates_idx != -1))
399 sta->last_tx_rate = info->status.rates[rates_idx];
400
401 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
402 (ieee80211_is_data_qos(fc))) {
403 u16 tid, ssn;
404 u8 *qc;
405
406 qc = ieee80211_get_qos_ctl(hdr);
407 tid = qc[0] & 0xf;
408 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
409 & IEEE80211_SCTL_SEQ);
410 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
411 tid, ssn);
412 }
413
414 if (!acked && ieee80211_is_back_req(fc)) {
415 u16 control;
416
417 /*
418 * BAR failed, store the last SSN and retry sending
419 * the BAR when the next unicast transmission on the
420 * same TID succeeds.
421 */
422 bar = (struct ieee80211_bar *) skb->data;
423 control = le16_to_cpu(bar->control);
424 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
425 u16 ssn = le16_to_cpu(bar->start_seq_num);
426
427 tid = (control &
428 IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
429 IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
430
431 ieee80211_set_bar_pending(sta, tid, ssn);
432 }
433 }
434
435 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
436 ieee80211_handle_filtered_frame(local, sta, skb);
437 rcu_read_unlock();
438 return;
439 } else {
440 if (!acked)
441 sta->tx_retry_failed++;
442 sta->tx_retry_count += retry_count;
443 }
444
445 rate_control_tx_status(local, sband, sta, skb);
446 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
447 ieee80211s_update_metric(local, sta, skb);
448
449 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
450 ieee80211_frame_acked(sta, skb);
451
452 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
453 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
454 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, acked);
455
456 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
457 if (info->flags & IEEE80211_TX_STAT_ACK) {
458 if (sta->lost_packets)
459 sta->lost_packets = 0;
460 } else if (++sta->lost_packets >= STA_LOST_PKT_THRESHOLD) {
461 cfg80211_cqm_pktloss_notify(sta->sdata->dev,
462 sta->sta.addr,
463 sta->lost_packets,
464 GFP_ATOMIC);
465 sta->lost_packets = 0;
466 }
467 }
468 }
469
470 rcu_read_unlock();
471
472 ieee80211_led_tx(local, 0);
473
474 /* SNMP counters
475 * Fragments are passed to low-level drivers as separate skbs, so these
476 * are actually fragments, not frames. Update frame counters only for
477 * the first fragment of the frame. */
478 if (info->flags & IEEE80211_TX_STAT_ACK) {
479 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
480 local->dot11TransmittedFrameCount++;
481 if (is_multicast_ether_addr(hdr->addr1))
482 local->dot11MulticastTransmittedFrameCount++;
483 if (retry_count > 0)
484 local->dot11RetryCount++;
485 if (retry_count > 1)
486 local->dot11MultipleRetryCount++;
487 }
488
489 /* This counter shall be incremented for an acknowledged MPDU
490 * with an individual address in the address 1 field or an MPDU
491 * with a multicast address in the address 1 field of type Data
492 * or Management. */
493 if (!is_multicast_ether_addr(hdr->addr1) ||
494 ieee80211_is_data(fc) ||
495 ieee80211_is_mgmt(fc))
496 local->dot11TransmittedFragmentCount++;
497 } else {
498 if (ieee80211_is_first_frag(hdr->seq_ctrl))
499 local->dot11FailedCount++;
500 }
501
502 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
503 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
504 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
505 local->ps_sdata && !(local->scanning)) {
506 if (info->flags & IEEE80211_TX_STAT_ACK) {
507 local->ps_sdata->u.mgd.flags |=
508 IEEE80211_STA_NULLFUNC_ACKED;
509 } else
510 mod_timer(&local->dynamic_ps_timer, jiffies +
511 msecs_to_jiffies(10));
512 }
513
514 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
515 u64 cookie = (unsigned long)skb;
516
517 if (ieee80211_is_nullfunc(hdr->frame_control) ||
518 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
519 bool acked = info->flags & IEEE80211_TX_STAT_ACK;
520 cfg80211_probe_status(skb->dev, hdr->addr1,
521 cookie, acked, GFP_ATOMIC);
522 } else {
523 struct ieee80211_work *wk;
524
525 rcu_read_lock();
526 list_for_each_entry_rcu(wk, &local->work_list, list) {
527 if (wk->type != IEEE80211_WORK_OFFCHANNEL_TX)
528 continue;
529 if (wk->offchan_tx.frame != skb)
530 continue;
531 wk->offchan_tx.status = true;
532 break;
533 }
534 rcu_read_unlock();
535 if (local->hw_roc_skb_for_status == skb) {
536 cookie = local->hw_roc_cookie ^ 2;
537 local->hw_roc_skb_for_status = NULL;
538 }
539
540 cfg80211_mgmt_tx_status(
541 skb->dev, cookie, skb->data, skb->len,
542 !!(info->flags & IEEE80211_TX_STAT_ACK),
543 GFP_ATOMIC);
544 }
545 }
546
547 if (unlikely(info->ack_frame_id)) {
548 struct sk_buff *ack_skb;
549 unsigned long flags;
550
551 spin_lock_irqsave(&local->ack_status_lock, flags);
552 ack_skb = idr_find(&local->ack_status_frames,
553 info->ack_frame_id);
554 if (ack_skb)
555 idr_remove(&local->ack_status_frames,
556 info->ack_frame_id);
557 spin_unlock_irqrestore(&local->ack_status_lock, flags);
558
559 /* consumes ack_skb */
560 if (ack_skb)
561 skb_complete_wifi_ack(ack_skb,
562 info->flags & IEEE80211_TX_STAT_ACK);
563 }
564
565 /* this was a transmitted frame, but now we want to reuse it */
566 skb_orphan(skb);
567
568 /* Need to make a copy before skb->cb gets cleared */
569 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
570 !(ieee80211_is_data(fc));
571
572 /*
573 * This is a bit racy but we can avoid a lot of work
574 * with this test...
575 */
576 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
577 dev_kfree_skb(skb);
578 return;
579 }
580
581 /* send frame to monitor interfaces now */
582 rtap_len = ieee80211_tx_radiotap_len(info);
583 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
584 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
585 dev_kfree_skb(skb);
586 return;
587 }
588 ieee80211_add_tx_radiotap_header(sband, skb, retry_count, rtap_len);
589
590 /* XXX: is this sufficient for BPF? */
591 skb_set_mac_header(skb, 0);
592 skb->ip_summed = CHECKSUM_UNNECESSARY;
593 skb->pkt_type = PACKET_OTHERHOST;
594 skb->protocol = htons(ETH_P_802_2);
595 memset(skb->cb, 0, sizeof(skb->cb));
596
597 rcu_read_lock();
598 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
599 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
600 if (!ieee80211_sdata_running(sdata))
601 continue;
602
603 if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
604 !send_to_cooked)
605 continue;
606
607 if (prev_dev) {
608 skb2 = skb_clone(skb, GFP_ATOMIC);
609 if (skb2) {
610 skb2->dev = prev_dev;
611 netif_rx(skb2);
612 }
613 }
614
615 prev_dev = sdata->dev;
616 }
617 }
618 if (prev_dev) {
619 skb->dev = prev_dev;
620 netif_rx(skb);
621 skb = NULL;
622 }
623 rcu_read_unlock();
624 dev_kfree_skb(skb);
625 }
626 EXPORT_SYMBOL(ieee80211_tx_status);
627
ieee80211_report_low_ack(struct ieee80211_sta * pubsta,u32 num_packets)628 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
629 {
630 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
631 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
632 num_packets, GFP_ATOMIC);
633 }
634 EXPORT_SYMBOL(ieee80211_report_low_ack);
635
ieee80211_free_txskb(struct ieee80211_hw * hw,struct sk_buff * skb)636 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
637 {
638 struct ieee80211_local *local = hw_to_local(hw);
639 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
640
641 if (unlikely(info->ack_frame_id)) {
642 struct sk_buff *ack_skb;
643 unsigned long flags;
644
645 spin_lock_irqsave(&local->ack_status_lock, flags);
646 ack_skb = idr_find(&local->ack_status_frames,
647 info->ack_frame_id);
648 if (ack_skb)
649 idr_remove(&local->ack_status_frames,
650 info->ack_frame_id);
651 spin_unlock_irqrestore(&local->ack_status_lock, flags);
652
653 /* consumes ack_skb */
654 if (ack_skb)
655 dev_kfree_skb_any(ack_skb);
656 }
657
658 dev_kfree_skb_any(skb);
659 }
660 EXPORT_SYMBOL(ieee80211_free_txskb);
661