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Linux 4.14.209
[linux/fpc-iii.git] / net / mac80211 / status.c
blobfcfa6714e4924b960234d08eb537200abd2902b9
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2008-2010 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/export.h>
14 #include <linux/etherdevice.h>
15 #include <net/mac80211.h>
16 #include <asm/unaligned.h>
17 #include "ieee80211_i.h"
18 #include "rate.h"
19 #include "mesh.h"
20 #include "led.h"
21 #include "wme.h"
22
23
24 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
25 struct sk_buff *skb)
26 {
27 struct ieee80211_local *local = hw_to_local(hw);
28 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
29 int tmp;
30
31 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
32 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
33 &local->skb_queue : &local->skb_queue_unreliable, skb);
34 tmp = skb_queue_len(&local->skb_queue) +
35 skb_queue_len(&local->skb_queue_unreliable);
36 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
37 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
38 ieee80211_free_txskb(hw, skb);
39 tmp--;
40 I802_DEBUG_INC(local->tx_status_drop);
41 }
42 tasklet_schedule(&local->tasklet);
43 }
44 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
45
46 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
47 struct sta_info *sta,
48 struct sk_buff *skb)
49 {
50 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
51 struct ieee80211_hdr *hdr = (void *)skb->data;
52 int ac;
53
54 if (info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER |
55 IEEE80211_TX_CTL_AMPDU)) {
56 ieee80211_free_txskb(&local->hw, skb);
57 return;
58 }
59
60 /*
61 * This skb 'survived' a round-trip through the driver, and
62 * hopefully the driver didn't mangle it too badly. However,
63 * we can definitely not rely on the control information
64 * being correct. Clear it so we don't get junk there, and
65 * indicate that it needs new processing, but must not be
66 * modified/encrypted again.
67 */
68 memset(&info->control, 0, sizeof(info->control));
69
70 info->control.jiffies = jiffies;
71 info->control.vif = &sta->sdata->vif;
72 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
73 IEEE80211_TX_INTFL_RETRANSMISSION;
74 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
75
76 sta->status_stats.filtered++;
77
78 /*
79 * Clear more-data bit on filtered frames, it might be set
80 * but later frames might time out so it might have to be
81 * clear again ... It's all rather unlikely (this frame
82 * should time out first, right?) but let's not confuse
83 * peers unnecessarily.
84 */
85 if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
86 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
87
88 if (ieee80211_is_data_qos(hdr->frame_control)) {
89 u8 *p = ieee80211_get_qos_ctl(hdr);
90 int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
91
92 /*
93 * Clear EOSP if set, this could happen e.g.
94 * if an absence period (us being a P2P GO)
95 * shortens the SP.
96 */
97 if (*p & IEEE80211_QOS_CTL_EOSP)
98 *p &= ~IEEE80211_QOS_CTL_EOSP;
99 ac = ieee80211_ac_from_tid(tid);
100 } else {
101 ac = IEEE80211_AC_BE;
102 }
103
104 /*
105 * Clear the TX filter mask for this STA when sending the next
106 * packet. If the STA went to power save mode, this will happen
107 * when it wakes up for the next time.
108 */
109 set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
110 ieee80211_clear_fast_xmit(sta);
111
112 /*
113 * This code races in the following way:
114 *
115 * (1) STA sends frame indicating it will go to sleep and does so
116 * (2) hardware/firmware adds STA to filter list, passes frame up
117 * (3) hardware/firmware processes TX fifo and suppresses a frame
118 * (4) we get TX status before having processed the frame and
119 * knowing that the STA has gone to sleep.
120 *
121 * This is actually quite unlikely even when both those events are
122 * processed from interrupts coming in quickly after one another or
123 * even at the same time because we queue both TX status events and
124 * RX frames to be processed by a tasklet and process them in the
125 * same order that they were received or TX status last. Hence, there
126 * is no race as long as the frame RX is processed before the next TX
127 * status, which drivers can ensure, see below.
128 *
129 * Note that this can only happen if the hardware or firmware can
130 * actually add STAs to the filter list, if this is done by the
131 * driver in response to set_tim() (which will only reduce the race
132 * this whole filtering tries to solve, not completely solve it)
133 * this situation cannot happen.
134 *
135 * To completely solve this race drivers need to make sure that they
136 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
137 * functions and
138 * (b) always process RX events before TX status events if ordering
139 * can be unknown, for example with different interrupt status
140 * bits.
141 * (c) if PS mode transitions are manual (i.e. the flag
142 * %IEEE80211_HW_AP_LINK_PS is set), always process PS state
143 * changes before calling TX status events if ordering can be
144 * unknown.
145 */
146 if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
147 skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
148 skb_queue_tail(&sta->tx_filtered[ac], skb);
149 sta_info_recalc_tim(sta);
150
151 if (!timer_pending(&local->sta_cleanup))
152 mod_timer(&local->sta_cleanup,
153 round_jiffies(jiffies +
154 STA_INFO_CLEANUP_INTERVAL));
155 return;
156 }
157
158 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
159 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
160 /* Software retry the packet once */
161 info->flags |= IEEE80211_TX_INTFL_RETRIED;
162 ieee80211_add_pending_skb(local, skb);
163 return;
164 }
165
166 ps_dbg_ratelimited(sta->sdata,
167 "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
168 skb_queue_len(&sta->tx_filtered[ac]),
169 !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
170 ieee80211_free_txskb(&local->hw, skb);
171 }
172
173 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
174 {
175 struct tid_ampdu_tx *tid_tx;
176
177 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
178 if (!tid_tx || !tid_tx->bar_pending)
179 return;
180
181 tid_tx->bar_pending = false;
182 ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
183 }
184
185 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
186 {
187 struct ieee80211_mgmt *mgmt = (void *) skb->data;
188 struct ieee80211_local *local = sta->local;
189 struct ieee80211_sub_if_data *sdata = sta->sdata;
190
191 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
192 sta->status_stats.last_ack = jiffies;
193
194 if (ieee80211_is_data_qos(mgmt->frame_control)) {
195 struct ieee80211_hdr *hdr = (void *) skb->data;
196 u8 *qc = ieee80211_get_qos_ctl(hdr);
197 u16 tid = qc[0] & 0xf;
198
199 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
200 }
201
202 if (ieee80211_is_action(mgmt->frame_control) &&
203 !ieee80211_has_protected(mgmt->frame_control) &&
204 mgmt->u.action.category == WLAN_CATEGORY_HT &&
205 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
206 ieee80211_sdata_running(sdata)) {
207 enum ieee80211_smps_mode smps_mode;
208
209 switch (mgmt->u.action.u.ht_smps.smps_control) {
210 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
211 smps_mode = IEEE80211_SMPS_DYNAMIC;
212 break;
213 case WLAN_HT_SMPS_CONTROL_STATIC:
214 smps_mode = IEEE80211_SMPS_STATIC;
215 break;
216 case WLAN_HT_SMPS_CONTROL_DISABLED:
217 default: /* shouldn't happen since we don't send that */
218 smps_mode = IEEE80211_SMPS_OFF;
219 break;
220 }
221
222 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
223 /*
224 * This update looks racy, but isn't -- if we come
225 * here we've definitely got a station that we're
226 * talking to, and on a managed interface that can
227 * only be the AP. And the only other place updating
228 * this variable in managed mode is before association.
229 */
230 sdata->smps_mode = smps_mode;
231 ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
232 } else if (sdata->vif.type == NL80211_IFTYPE_AP ||
233 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
234 sta->known_smps_mode = smps_mode;
235 }
236 }
237 }
238
239 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
240 {
241 struct tid_ampdu_tx *tid_tx;
242
243 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
244 if (!tid_tx)
245 return;
246
247 tid_tx->failed_bar_ssn = ssn;
248 tid_tx->bar_pending = true;
249 }
250
251 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info)
252 {
253 int len = sizeof(struct ieee80211_radiotap_header);
254
255 /* IEEE80211_RADIOTAP_RATE rate */
256 if (info->status.rates[0].idx >= 0 &&
257 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
258 IEEE80211_TX_RC_VHT_MCS)))
259 len += 2;
260
261 /* IEEE80211_RADIOTAP_TX_FLAGS */
262 len += 2;
263
264 /* IEEE80211_RADIOTAP_DATA_RETRIES */
265 len += 1;
266
267 /* IEEE80211_RADIOTAP_MCS
268 * IEEE80211_RADIOTAP_VHT */
269 if (info->status.rates[0].idx >= 0) {
270 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
271 len += 3;
272 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
273 len = ALIGN(len, 2) + 12;
274 }
275
276 return len;
277 }
278
279 static void
280 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
281 struct ieee80211_supported_band *sband,
282 struct sk_buff *skb, int retry_count,
283 int rtap_len, int shift)
284 {
285 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
286 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
287 struct ieee80211_radiotap_header *rthdr;
288 unsigned char *pos;
289 u16 txflags;
290
291 rthdr = skb_push(skb, rtap_len);
292
293 memset(rthdr, 0, rtap_len);
294 rthdr->it_len = cpu_to_le16(rtap_len);
295 rthdr->it_present =
296 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
297 (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
298 pos = (unsigned char *)(rthdr + 1);
299
300 /*
301 * XXX: Once radiotap gets the bitmap reset thing the vendor
302 * extensions proposal contains, we can actually report
303 * the whole set of tries we did.
304 */
305
306 /* IEEE80211_RADIOTAP_RATE */
307 if (info->status.rates[0].idx >= 0 &&
308 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
309 IEEE80211_TX_RC_VHT_MCS))) {
310 u16 rate;
311
312 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
313 rate = sband->bitrates[info->status.rates[0].idx].bitrate;
314 *pos = DIV_ROUND_UP(rate, 5 * (1 << shift));
315 /* padding for tx flags */
316 pos += 2;
317 }
318
319 /* IEEE80211_RADIOTAP_TX_FLAGS */
320 txflags = 0;
321 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
322 !is_multicast_ether_addr(hdr->addr1))
323 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
324
325 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
326 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
327 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
328 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
329
330 put_unaligned_le16(txflags, pos);
331 pos += 2;
332
333 /* IEEE80211_RADIOTAP_DATA_RETRIES */
334 /* for now report the total retry_count */
335 *pos = retry_count;
336 pos++;
337
338 if (info->status.rates[0].idx < 0)
339 return;
340
341 /* IEEE80211_RADIOTAP_MCS
342 * IEEE80211_RADIOTAP_VHT */
343 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
344 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
345 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
346 IEEE80211_RADIOTAP_MCS_HAVE_GI |
347 IEEE80211_RADIOTAP_MCS_HAVE_BW;
348 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
349 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
350 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
351 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
352 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
353 pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
354 pos[2] = info->status.rates[0].idx;
355 pos += 3;
356 } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
357 u16 known = local->hw.radiotap_vht_details &
358 (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
359 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
360
361 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
362
363 /* required alignment from rthdr */
364 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
365
366 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
367 put_unaligned_le16(known, pos);
368 pos += 2;
369
370 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
371 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
372 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
373 pos++;
374
375 /* u8 bandwidth */
376 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
377 *pos = 1;
378 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
379 *pos = 4;
380 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
381 *pos = 11;
382 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
383 *pos = 0;
384 pos++;
385
386 /* u8 mcs_nss[4] */
387 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
388 ieee80211_rate_get_vht_nss(&info->status.rates[0]);
389 pos += 4;
390
391 /* u8 coding */
392 pos++;
393 /* u8 group_id */
394 pos++;
395 /* u16 partial_aid */
396 pos += 2;
397 }
398 }
399
400 /*
401 * Handles the tx for TDLS teardown frames.
402 * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
403 */
404 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
405 struct ieee80211_sub_if_data *sdata,
406 struct sk_buff *skb, u32 flags)
407 {
408 struct sk_buff *teardown_skb;
409 struct sk_buff *orig_teardown_skb;
410 bool is_teardown = false;
411
412 /* Get the teardown data we need and free the lock */
413 spin_lock(&sdata->u.mgd.teardown_lock);
414 teardown_skb = sdata->u.mgd.teardown_skb;
415 orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
416 if ((skb == orig_teardown_skb) && teardown_skb) {
417 sdata->u.mgd.teardown_skb = NULL;
418 sdata->u.mgd.orig_teardown_skb = NULL;
419 is_teardown = true;
420 }
421 spin_unlock(&sdata->u.mgd.teardown_lock);
422
423 if (is_teardown) {
424 /* This mechanism relies on being able to get ACKs */
425 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
426
427 /* Check if peer has ACKed */
428 if (flags & IEEE80211_TX_STAT_ACK) {
429 dev_kfree_skb_any(teardown_skb);
430 } else {
431 tdls_dbg(sdata,
432 "TDLS Resending teardown through AP\n");
433
434 ieee80211_subif_start_xmit(teardown_skb, skb->dev);
435 }
436 }
437 }
438
439 static struct ieee80211_sub_if_data *
440 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
441 {
442 struct ieee80211_sub_if_data *sdata;
443
444 if (skb->dev) {
445 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
446 if (!sdata->dev)
447 continue;
448
449 if (skb->dev == sdata->dev)
450 return sdata;
451 }
452
453 return NULL;
454 }
455
456 return rcu_dereference(local->p2p_sdata);
457 }
458
459 static void ieee80211_report_ack_skb(struct ieee80211_local *local,
460 struct ieee80211_tx_info *info,
461 bool acked, bool dropped)
462 {
463 struct sk_buff *skb;
464 unsigned long flags;
465
466 spin_lock_irqsave(&local->ack_status_lock, flags);
467 skb = idr_remove(&local->ack_status_frames, info->ack_frame_id);
468 spin_unlock_irqrestore(&local->ack_status_lock, flags);
469
470 if (!skb)
471 return;
472
473 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
474 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
475 struct ieee80211_sub_if_data *sdata;
476 struct ieee80211_hdr *hdr = (void *)skb->data;
477
478 rcu_read_lock();
479 sdata = ieee80211_sdata_from_skb(local, skb);
480 if (sdata) {
481 if (ieee80211_is_any_nullfunc(hdr->frame_control))
482 cfg80211_probe_status(sdata->dev, hdr->addr1,
483 cookie, acked,
484 GFP_ATOMIC);
485 else
486 cfg80211_mgmt_tx_status(&sdata->wdev, cookie,
487 skb->data, skb->len,
488 acked, GFP_ATOMIC);
489 }
490 rcu_read_unlock();
491
492 dev_kfree_skb_any(skb);
493 } else if (dropped) {
494 dev_kfree_skb_any(skb);
495 } else {
496 /* consumes skb */
497 skb_complete_wifi_ack(skb, acked);
498 }
499 }
500
501 static void ieee80211_report_used_skb(struct ieee80211_local *local,
502 struct sk_buff *skb, bool dropped)
503 {
504 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
505 struct ieee80211_hdr *hdr = (void *)skb->data;
506 bool acked = info->flags & IEEE80211_TX_STAT_ACK;
507
508 if (dropped)
509 acked = false;
510
511 if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
512 struct ieee80211_sub_if_data *sdata;
513
514 rcu_read_lock();
515
516 sdata = ieee80211_sdata_from_skb(local, skb);
517
518 if (!sdata) {
519 skb->dev = NULL;
520 } else {
521 unsigned int hdr_size =
522 ieee80211_hdrlen(hdr->frame_control);
523
524 /* Check to see if packet is a TDLS teardown packet */
525 if (ieee80211_is_data(hdr->frame_control) &&
526 (ieee80211_get_tdls_action(skb, hdr_size) ==
527 WLAN_TDLS_TEARDOWN))
528 ieee80211_tdls_td_tx_handle(local, sdata, skb,
529 info->flags);
530 else
531 ieee80211_mgd_conn_tx_status(sdata,
532 hdr->frame_control,
533 acked);
534 }
535
536 rcu_read_unlock();
537 } else if (info->ack_frame_id) {
538 ieee80211_report_ack_skb(local, info, acked, dropped);
539 }
540
541 if (!dropped && skb->destructor) {
542 skb->wifi_acked_valid = 1;
543 skb->wifi_acked = acked;
544 }
545
546 ieee80211_led_tx(local);
547
548 if (skb_has_frag_list(skb)) {
549 kfree_skb_list(skb_shinfo(skb)->frag_list);
550 skb_shinfo(skb)->frag_list = NULL;
551 }
552 }
553
554 /*
555 * Use a static threshold for now, best value to be determined
556 * by testing ...
557 * Should it depend on:
558 * - on # of retransmissions
559 * - current throughput (higher value for higher tpt)?
560 */
561 #define STA_LOST_PKT_THRESHOLD 50
562 #define STA_LOST_TDLS_PKT_THRESHOLD 10
563 #define STA_LOST_TDLS_PKT_TIME (10*HZ) /* 10secs since last ACK */
564
565 static void ieee80211_lost_packet(struct sta_info *sta,
566 struct ieee80211_tx_info *info)
567 {
568 /* If driver relies on its own algorithm for station kickout, skip
569 * mac80211 packet loss mechanism.
570 */
571 if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
572 return;
573
574 /* This packet was aggregated but doesn't carry status info */
575 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
576 !(info->flags & IEEE80211_TX_STAT_AMPDU))
577 return;
578
579 sta->status_stats.lost_packets++;
580 if (!sta->sta.tdls &&
581 sta->status_stats.lost_packets < STA_LOST_PKT_THRESHOLD)
582 return;
583
584 /*
585 * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD
586 * of the last packets were lost, and that no ACK was received in the
587 * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
588 * mechanism.
589 */
590 if (sta->sta.tdls &&
591 (sta->status_stats.lost_packets < STA_LOST_TDLS_PKT_THRESHOLD ||
592 time_before(jiffies,
593 sta->status_stats.last_tdls_pkt_time +
594 STA_LOST_TDLS_PKT_TIME)))
595 return;
596
597 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
598 sta->status_stats.lost_packets, GFP_ATOMIC);
599 sta->status_stats.lost_packets = 0;
600 }
601
602 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
603 struct ieee80211_tx_info *info,
604 int *retry_count)
605 {
606 int rates_idx = -1;
607 int count = -1;
608 int i;
609
610 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
611 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
612 !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
613 /* just the first aggr frame carry status info */
614 info->status.rates[i].idx = -1;
615 info->status.rates[i].count = 0;
616 break;
617 } else if (info->status.rates[i].idx < 0) {
618 break;
619 } else if (i >= hw->max_report_rates) {
620 /* the HW cannot have attempted that rate */
621 info->status.rates[i].idx = -1;
622 info->status.rates[i].count = 0;
623 break;
624 }
625
626 count += info->status.rates[i].count;
627 }
628 rates_idx = i - 1;
629
630 if (count < 0)
631 count = 0;
632
633 *retry_count = count;
634 return rates_idx;
635 }
636
637 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
638 struct ieee80211_supported_band *sband,
639 int retry_count, int shift, bool send_to_cooked)
640 {
641 struct sk_buff *skb2;
642 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
643 struct ieee80211_sub_if_data *sdata;
644 struct net_device *prev_dev = NULL;
645 int rtap_len;
646
647 /* send frame to monitor interfaces now */
648 rtap_len = ieee80211_tx_radiotap_len(info);
649 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
650 pr_err("ieee80211_tx_status: headroom too small\n");
651 dev_kfree_skb(skb);
652 return;
653 }
654 ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
655 rtap_len, shift);
656
657 /* XXX: is this sufficient for BPF? */
658 skb_reset_mac_header(skb);
659 skb->ip_summed = CHECKSUM_UNNECESSARY;
660 skb->pkt_type = PACKET_OTHERHOST;
661 skb->protocol = htons(ETH_P_802_2);
662 memset(skb->cb, 0, sizeof(skb->cb));
663
664 rcu_read_lock();
665 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
666 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
667 if (!ieee80211_sdata_running(sdata))
668 continue;
669
670 if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
671 !send_to_cooked)
672 continue;
673
674 if (prev_dev) {
675 skb2 = skb_clone(skb, GFP_ATOMIC);
676 if (skb2) {
677 skb2->dev = prev_dev;
678 netif_rx(skb2);
679 }
680 }
681
682 prev_dev = sdata->dev;
683 }
684 }
685 if (prev_dev) {
686 skb->dev = prev_dev;
687 netif_rx(skb);
688 skb = NULL;
689 }
690 rcu_read_unlock();
691 dev_kfree_skb(skb);
692 }
693
694 static void __ieee80211_tx_status(struct ieee80211_hw *hw,
695 struct ieee80211_tx_status *status)
696 {
697 struct sk_buff *skb = status->skb;
698 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
699 struct ieee80211_local *local = hw_to_local(hw);
700 struct ieee80211_tx_info *info = status->info;
701 struct sta_info *sta;
702 __le16 fc;
703 struct ieee80211_supported_band *sband;
704 int retry_count;
705 int rates_idx;
706 bool send_to_cooked;
707 bool acked;
708 struct ieee80211_bar *bar;
709 int shift = 0;
710 int tid = IEEE80211_NUM_TIDS;
711
712 rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
713
714 sband = local->hw.wiphy->bands[info->band];
715 fc = hdr->frame_control;
716
717 if (status->sta) {
718 sta = container_of(status->sta, struct sta_info, sta);
719 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
720
721 if (info->flags & IEEE80211_TX_STATUS_EOSP)
722 clear_sta_flag(sta, WLAN_STA_SP);
723
724 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
725
726 /* mesh Peer Service Period support */
727 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
728 ieee80211_is_data_qos(fc))
729 ieee80211_mpsp_trigger_process(
730 ieee80211_get_qos_ctl(hdr), sta, true, acked);
731
732 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
733 /*
734 * The STA is in power save mode, so assume
735 * that this TX packet failed because of that.
736 */
737 ieee80211_handle_filtered_frame(local, sta, skb);
738 return;
739 }
740
741 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
742 (ieee80211_is_data(hdr->frame_control)) &&
743 (rates_idx != -1))
744 sta->tx_stats.last_rate =
745 info->status.rates[rates_idx];
746
747 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
748 (ieee80211_is_data_qos(fc))) {
749 u16 ssn;
750 u8 *qc;
751
752 qc = ieee80211_get_qos_ctl(hdr);
753 tid = qc[0] & 0xf;
754 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
755 & IEEE80211_SCTL_SEQ);
756 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
757 tid, ssn);
758 } else if (ieee80211_is_data_qos(fc)) {
759 u8 *qc = ieee80211_get_qos_ctl(hdr);
760
761 tid = qc[0] & 0xf;
762 }
763
764 if (!acked && ieee80211_is_back_req(fc)) {
765 u16 control;
766
767 /*
768 * BAR failed, store the last SSN and retry sending
769 * the BAR when the next unicast transmission on the
770 * same TID succeeds.
771 */
772 bar = (struct ieee80211_bar *) skb->data;
773 control = le16_to_cpu(bar->control);
774 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
775 u16 ssn = le16_to_cpu(bar->start_seq_num);
776
777 tid = (control &
778 IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
779 IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
780
781 ieee80211_set_bar_pending(sta, tid, ssn);
782 }
783 }
784
785 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
786 ieee80211_handle_filtered_frame(local, sta, skb);
787 return;
788 } else {
789 if (!acked)
790 sta->status_stats.retry_failed++;
791 sta->status_stats.retry_count += retry_count;
792
793 if (ieee80211_is_data_present(fc)) {
794 if (!acked)
795 sta->status_stats.msdu_failed[tid]++;
796
797 sta->status_stats.msdu_retries[tid] +=
798 retry_count;
799 }
800 }
801
802 rate_control_tx_status(local, sband, status);
803 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
804 ieee80211s_update_metric(local, sta, status);
805
806 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
807 ieee80211_frame_acked(sta, skb);
808
809 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
810 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
811 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data,
812 acked, info->status.tx_time);
813
814 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
815 if (info->flags & IEEE80211_TX_STAT_ACK) {
816 if (sta->status_stats.lost_packets)
817 sta->status_stats.lost_packets = 0;
818
819 /* Track when last TDLS packet was ACKed */
820 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
821 sta->status_stats.last_tdls_pkt_time =
822 jiffies;
823 } else {
824 ieee80211_lost_packet(sta, info);
825 }
826 }
827 }
828
829 /* SNMP counters
830 * Fragments are passed to low-level drivers as separate skbs, so these
831 * are actually fragments, not frames. Update frame counters only for
832 * the first fragment of the frame. */
833 if ((info->flags & IEEE80211_TX_STAT_ACK) ||
834 (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
835 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
836 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
837 if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
838 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
839 if (retry_count > 0)
840 I802_DEBUG_INC(local->dot11RetryCount);
841 if (retry_count > 1)
842 I802_DEBUG_INC(local->dot11MultipleRetryCount);
843 }
844
845 /* This counter shall be incremented for an acknowledged MPDU
846 * with an individual address in the address 1 field or an MPDU
847 * with a multicast address in the address 1 field of type Data
848 * or Management. */
849 if (!is_multicast_ether_addr(hdr->addr1) ||
850 ieee80211_is_data(fc) ||
851 ieee80211_is_mgmt(fc))
852 I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
853 } else {
854 if (ieee80211_is_first_frag(hdr->seq_ctrl))
855 I802_DEBUG_INC(local->dot11FailedCount);
856 }
857
858 if (ieee80211_is_any_nullfunc(fc) &&
859 ieee80211_has_pm(fc) &&
860 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
861 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
862 local->ps_sdata && !(local->scanning)) {
863 if (info->flags & IEEE80211_TX_STAT_ACK) {
864 local->ps_sdata->u.mgd.flags |=
865 IEEE80211_STA_NULLFUNC_ACKED;
866 } else
867 mod_timer(&local->dynamic_ps_timer, jiffies +
868 msecs_to_jiffies(10));
869 }
870
871 ieee80211_report_used_skb(local, skb, false);
872
873 /* this was a transmitted frame, but now we want to reuse it */
874 skb_orphan(skb);
875
876 /* Need to make a copy before skb->cb gets cleared */
877 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
878 !(ieee80211_is_data(fc));
879
880 /*
881 * This is a bit racy but we can avoid a lot of work
882 * with this test...
883 */
884 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
885 dev_kfree_skb(skb);
886 return;
887 }
888
889 /* send to monitor interfaces */
890 ieee80211_tx_monitor(local, skb, sband, retry_count, shift, send_to_cooked);
891 }
892
893 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
894 {
895 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
896 struct ieee80211_local *local = hw_to_local(hw);
897 struct ieee80211_tx_status status = {
898 .skb = skb,
899 .info = IEEE80211_SKB_CB(skb),
900 };
901 struct rhlist_head *tmp;
902 struct sta_info *sta;
903
904 rcu_read_lock();
905
906 for_each_sta_info(local, hdr->addr1, sta, tmp) {
907 /* skip wrong virtual interface */
908 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr))
909 continue;
910
911 status.sta = &sta->sta;
912 break;
913 }
914
915 __ieee80211_tx_status(hw, &status);
916 rcu_read_unlock();
917 }
918 EXPORT_SYMBOL(ieee80211_tx_status);
919
920 void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
921 struct ieee80211_tx_status *status)
922 {
923 struct ieee80211_local *local = hw_to_local(hw);
924 struct ieee80211_tx_info *info = status->info;
925 struct ieee80211_sta *pubsta = status->sta;
926 struct ieee80211_supported_band *sband;
927 int retry_count;
928 bool acked, noack_success;
929
930 if (status->skb)
931 return __ieee80211_tx_status(hw, status);
932
933 if (!status->sta)
934 return;
935
936 ieee80211_tx_get_rates(hw, info, &retry_count);
937
938 sband = hw->wiphy->bands[info->band];
939
940 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
941 noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
942
943 if (pubsta) {
944 struct sta_info *sta;
945
946 sta = container_of(pubsta, struct sta_info, sta);
947
948 if (!acked)
949 sta->status_stats.retry_failed++;
950 sta->status_stats.retry_count += retry_count;
951
952 if (acked) {
953 sta->status_stats.last_ack = jiffies;
954
955 if (sta->status_stats.lost_packets)
956 sta->status_stats.lost_packets = 0;
957
958 /* Track when last TDLS packet was ACKed */
959 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
960 sta->status_stats.last_tdls_pkt_time = jiffies;
961 } else if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
962 return;
963 } else {
964 ieee80211_lost_packet(sta, info);
965 }
966
967 rate_control_tx_status(local, sband, status);
968 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
969 ieee80211s_update_metric(local, sta, status);
970 }
971
972 if (acked || noack_success) {
973 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
974 if (!pubsta)
975 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
976 if (retry_count > 0)
977 I802_DEBUG_INC(local->dot11RetryCount);
978 if (retry_count > 1)
979 I802_DEBUG_INC(local->dot11MultipleRetryCount);
980 } else {
981 I802_DEBUG_INC(local->dot11FailedCount);
982 }
983 }
984 EXPORT_SYMBOL(ieee80211_tx_status_ext);
985
986 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
987 {
988 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
989 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
990 num_packets, GFP_ATOMIC);
991 }
992 EXPORT_SYMBOL(ieee80211_report_low_ack);
993
994 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
995 {
996 struct ieee80211_local *local = hw_to_local(hw);
997
998 ieee80211_report_used_skb(local, skb, true);
999 dev_kfree_skb_any(skb);
1000 }
1001 EXPORT_SYMBOL(ieee80211_free_txskb);
1002
1003 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
1004 struct sk_buff_head *skbs)
1005 {
1006 struct sk_buff *skb;
1007
1008 while ((skb = __skb_dequeue(skbs)))
1009 ieee80211_free_txskb(hw, skb);
1010 }
Linux with added FPC-III support