mac80211: Add HT operation modes for IBSS
[linux-2.6.git] / net / mac80211 / status.c
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
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
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
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
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
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
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
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
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         u16 frag, type;
344         __le16 fc;
345         struct ieee80211_supported_band *sband;
346         struct ieee80211_sub_if_data *sdata;
347         struct net_device *prev_dev = NULL;
348         struct sta_info *sta, *tmp;
349         int retry_count = -1, i;
350         int rates_idx = -1;
351         bool send_to_cooked;
352         bool acked;
353         struct ieee80211_bar *bar;
354         u16 tid;
355         int rtap_len;
356
357         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
358                 if (info->status.rates[i].idx < 0) {
359                         break;
360                 } else if (i >= hw->max_report_rates) {
361                         /* the HW cannot have attempted that rate */
362                         info->status.rates[i].idx = -1;
363                         info->status.rates[i].count = 0;
364                         break;
365                 }
366
367                 retry_count += info->status.rates[i].count;
368         }
369         rates_idx = i - 1;
370
371         if (retry_count < 0)
372                 retry_count = 0;
373
374         rcu_read_lock();
375
376         sband = local->hw.wiphy->bands[info->band];
377         fc = hdr->frame_control;
378
379         for_each_sta_info(local, hdr->addr1, sta, tmp) {
380                 /* skip wrong virtual interface */
381                 if (memcmp(hdr->addr2, sta->sdata->vif.addr, ETH_ALEN))
382                         continue;
383
384                 if (info->flags & IEEE80211_TX_STATUS_EOSP)
385                         clear_sta_flag(sta, WLAN_STA_SP);
386
387                 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
388                 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
389                         /*
390                          * The STA is in power save mode, so assume
391                          * that this TX packet failed because of that.
392                          */
393                         ieee80211_handle_filtered_frame(local, sta, skb);
394                         rcu_read_unlock();
395                         return;
396                 }
397
398                 if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) &&
399                     (rates_idx != -1))
400                         sta->last_tx_rate = info->status.rates[rates_idx];
401
402                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
403                     (ieee80211_is_data_qos(fc))) {
404                         u16 tid, ssn;
405                         u8 *qc;
406
407                         qc = ieee80211_get_qos_ctl(hdr);
408                         tid = qc[0] & 0xf;
409                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
410                                                 & IEEE80211_SCTL_SEQ);
411                         ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
412                                            tid, ssn);
413                 }
414
415                 if (!acked && ieee80211_is_back_req(fc)) {
416                         u16 control;
417
418                         /*
419                          * BAR failed, store the last SSN and retry sending
420                          * the BAR when the next unicast transmission on the
421                          * same TID succeeds.
422                          */
423                         bar = (struct ieee80211_bar *) skb->data;
424                         control = le16_to_cpu(bar->control);
425                         if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
426                                 u16 ssn = le16_to_cpu(bar->start_seq_num);
427
428                                 tid = (control &
429                                        IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
430                                       IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
431
432                                 ieee80211_set_bar_pending(sta, tid, ssn);
433                         }
434                 }
435
436                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
437                         ieee80211_handle_filtered_frame(local, sta, skb);
438                         rcu_read_unlock();
439                         return;
440                 } else {
441                         if (!acked)
442                                 sta->tx_retry_failed++;
443                         sta->tx_retry_count += retry_count;
444                 }
445
446                 rate_control_tx_status(local, sband, sta, skb);
447                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
448                         ieee80211s_update_metric(local, sta, skb);
449
450                 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
451                         ieee80211_frame_acked(sta, skb);
452
453                 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
454                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
455                         ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, acked);
456
457                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
458                         if (info->flags & IEEE80211_TX_STAT_ACK) {
459                                 if (sta->lost_packets)
460                                         sta->lost_packets = 0;
461                         } else if (++sta->lost_packets >= STA_LOST_PKT_THRESHOLD) {
462                                 cfg80211_cqm_pktloss_notify(sta->sdata->dev,
463                                                             sta->sta.addr,
464                                                             sta->lost_packets,
465                                                             GFP_ATOMIC);
466                                 sta->lost_packets = 0;
467                         }
468                 }
469         }
470
471         rcu_read_unlock();
472
473         ieee80211_led_tx(local, 0);
474
475         /* SNMP counters
476          * Fragments are passed to low-level drivers as separate skbs, so these
477          * are actually fragments, not frames. Update frame counters only for
478          * the first fragment of the frame. */
479
480         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
481         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
482
483         if (info->flags & IEEE80211_TX_STAT_ACK) {
484                 if (frag == 0) {
485                         local->dot11TransmittedFrameCount++;
486                         if (is_multicast_ether_addr(hdr->addr1))
487                                 local->dot11MulticastTransmittedFrameCount++;
488                         if (retry_count > 0)
489                                 local->dot11RetryCount++;
490                         if (retry_count > 1)
491                                 local->dot11MultipleRetryCount++;
492                 }
493
494                 /* This counter shall be incremented for an acknowledged MPDU
495                  * with an individual address in the address 1 field or an MPDU
496                  * with a multicast address in the address 1 field of type Data
497                  * or Management. */
498                 if (!is_multicast_ether_addr(hdr->addr1) ||
499                     type == IEEE80211_FTYPE_DATA ||
500                     type == IEEE80211_FTYPE_MGMT)
501                         local->dot11TransmittedFragmentCount++;
502         } else {
503                 if (frag == 0)
504                         local->dot11FailedCount++;
505         }
506
507         if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
508             (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
509             !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
510             local->ps_sdata && !(local->scanning)) {
511                 if (info->flags & IEEE80211_TX_STAT_ACK) {
512                         local->ps_sdata->u.mgd.flags |=
513                                         IEEE80211_STA_NULLFUNC_ACKED;
514                 } else
515                         mod_timer(&local->dynamic_ps_timer, jiffies +
516                                         msecs_to_jiffies(10));
517         }
518
519         if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
520                 u64 cookie = (unsigned long)skb;
521
522                 if (ieee80211_is_nullfunc(hdr->frame_control) ||
523                     ieee80211_is_qos_nullfunc(hdr->frame_control)) {
524                         bool acked = info->flags & IEEE80211_TX_STAT_ACK;
525                         cfg80211_probe_status(skb->dev, hdr->addr1,
526                                               cookie, acked, GFP_ATOMIC);
527                 } else {
528                         struct ieee80211_work *wk;
529
530                         rcu_read_lock();
531                         list_for_each_entry_rcu(wk, &local->work_list, list) {
532                                 if (wk->type != IEEE80211_WORK_OFFCHANNEL_TX)
533                                         continue;
534                                 if (wk->offchan_tx.frame != skb)
535                                         continue;
536                                 wk->offchan_tx.status = true;
537                                 break;
538                         }
539                         rcu_read_unlock();
540                         if (local->hw_roc_skb_for_status == skb) {
541                                 cookie = local->hw_roc_cookie ^ 2;
542                                 local->hw_roc_skb_for_status = NULL;
543                         }
544
545                         cfg80211_mgmt_tx_status(
546                                 skb->dev, cookie, skb->data, skb->len,
547                                 !!(info->flags & IEEE80211_TX_STAT_ACK),
548                                 GFP_ATOMIC);
549                 }
550         }
551
552         if (unlikely(info->ack_frame_id)) {
553                 struct sk_buff *ack_skb;
554                 unsigned long flags;
555
556                 spin_lock_irqsave(&local->ack_status_lock, flags);
557                 ack_skb = idr_find(&local->ack_status_frames,
558                                    info->ack_frame_id);
559                 if (ack_skb)
560                         idr_remove(&local->ack_status_frames,
561                                    info->ack_frame_id);
562                 spin_unlock_irqrestore(&local->ack_status_lock, flags);
563
564                 /* consumes ack_skb */
565                 if (ack_skb)
566                         skb_complete_wifi_ack(ack_skb,
567                                 info->flags & IEEE80211_TX_STAT_ACK);
568         }
569
570         /* this was a transmitted frame, but now we want to reuse it */
571         skb_orphan(skb);
572
573         /* Need to make a copy before skb->cb gets cleared */
574         send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
575                         (type != IEEE80211_FTYPE_DATA);
576
577         /*
578          * This is a bit racy but we can avoid a lot of work
579          * with this test...
580          */
581         if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
582                 dev_kfree_skb(skb);
583                 return;
584         }
585
586         /* send frame to monitor interfaces now */
587         rtap_len = ieee80211_tx_radiotap_len(info);
588         if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
589                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
590                 dev_kfree_skb(skb);
591                 return;
592         }
593         ieee80211_add_tx_radiotap_header(sband, skb, retry_count, rtap_len);
594
595         /* XXX: is this sufficient for BPF? */
596         skb_set_mac_header(skb, 0);
597         skb->ip_summed = CHECKSUM_UNNECESSARY;
598         skb->pkt_type = PACKET_OTHERHOST;
599         skb->protocol = htons(ETH_P_802_2);
600         memset(skb->cb, 0, sizeof(skb->cb));
601
602         rcu_read_lock();
603         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
604                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
605                         if (!ieee80211_sdata_running(sdata))
606                                 continue;
607
608                         if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
609                             !send_to_cooked)
610                                 continue;
611
612                         if (prev_dev) {
613                                 skb2 = skb_clone(skb, GFP_ATOMIC);
614                                 if (skb2) {
615                                         skb2->dev = prev_dev;
616                                         netif_rx(skb2);
617                                 }
618                         }
619
620                         prev_dev = sdata->dev;
621                 }
622         }
623         if (prev_dev) {
624                 skb->dev = prev_dev;
625                 netif_rx(skb);
626                 skb = NULL;
627         }
628         rcu_read_unlock();
629         dev_kfree_skb(skb);
630 }
631 EXPORT_SYMBOL(ieee80211_tx_status);
632
633 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
634 {
635         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
636         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
637                                     num_packets, GFP_ATOMIC);
638 }
639 EXPORT_SYMBOL(ieee80211_report_low_ack);
640
641 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
642 {
643         struct ieee80211_local *local = hw_to_local(hw);
644         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
645
646         if (unlikely(info->ack_frame_id)) {
647                 struct sk_buff *ack_skb;
648                 unsigned long flags;
649
650                 spin_lock_irqsave(&local->ack_status_lock, flags);
651                 ack_skb = idr_find(&local->ack_status_frames,
652                                    info->ack_frame_id);
653                 if (ack_skb)
654                         idr_remove(&local->ack_status_frames,
655                                    info->ack_frame_id);
656                 spin_unlock_irqrestore(&local->ack_status_lock, flags);
657
658                 /* consumes ack_skb */
659                 if (ack_skb)
660                         dev_kfree_skb_any(ack_skb);
661         }
662
663         dev_kfree_skb_any(skb);
664 }
665 EXPORT_SYMBOL(ieee80211_free_txskb);