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mac80211: track AP and peer STA TDLS chan-switch support
[mirror_ubuntu-bionic-kernel.git] / net / mac80211 / util.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 2007 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 * utilities for mac80211
13 */
14
15 #include <net/mac80211.h>
16 #include <linux/netdevice.h>
17 #include <linux/export.h>
18 #include <linux/types.h>
19 #include <linux/slab.h>
20 #include <linux/skbuff.h>
21 #include <linux/etherdevice.h>
22 #include <linux/if_arp.h>
23 #include <linux/bitmap.h>
24 #include <linux/crc32.h>
25 #include <net/net_namespace.h>
26 #include <net/cfg80211.h>
27 #include <net/rtnetlink.h>
28
29 #include "ieee80211_i.h"
30 #include "driver-ops.h"
31 #include "rate.h"
32 #include "mesh.h"
33 #include "wme.h"
34 #include "led.h"
35 #include "wep.h"
36
37 /* privid for wiphys to determine whether they belong to us or not */
38 const void *const mac80211_wiphy_privid = &mac80211_wiphy_privid;
39
40 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
41 {
42 struct ieee80211_local *local;
43 BUG_ON(!wiphy);
44
45 local = wiphy_priv(wiphy);
46 return &local->hw;
47 }
48 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
49
50 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
51 enum nl80211_iftype type)
52 {
53 __le16 fc = hdr->frame_control;
54
55 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
56 if (len < 16)
57 return NULL;
58
59 if (ieee80211_is_data(fc)) {
60 if (len < 24) /* drop incorrect hdr len (data) */
61 return NULL;
62
63 if (ieee80211_has_a4(fc))
64 return NULL;
65 if (ieee80211_has_tods(fc))
66 return hdr->addr1;
67 if (ieee80211_has_fromds(fc))
68 return hdr->addr2;
69
70 return hdr->addr3;
71 }
72
73 if (ieee80211_is_mgmt(fc)) {
74 if (len < 24) /* drop incorrect hdr len (mgmt) */
75 return NULL;
76 return hdr->addr3;
77 }
78
79 if (ieee80211_is_ctl(fc)) {
80 if (ieee80211_is_pspoll(fc))
81 return hdr->addr1;
82
83 if (ieee80211_is_back_req(fc)) {
84 switch (type) {
85 case NL80211_IFTYPE_STATION:
86 return hdr->addr2;
87 case NL80211_IFTYPE_AP:
88 case NL80211_IFTYPE_AP_VLAN:
89 return hdr->addr1;
90 default:
91 break; /* fall through to the return */
92 }
93 }
94 }
95
96 return NULL;
97 }
98
99 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
100 {
101 struct sk_buff *skb;
102 struct ieee80211_hdr *hdr;
103
104 skb_queue_walk(&tx->skbs, skb) {
105 hdr = (struct ieee80211_hdr *) skb->data;
106 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
107 }
108 }
109
110 int ieee80211_frame_duration(enum ieee80211_band band, size_t len,
111 int rate, int erp, int short_preamble,
112 int shift)
113 {
114 int dur;
115
116 /* calculate duration (in microseconds, rounded up to next higher
117 * integer if it includes a fractional microsecond) to send frame of
118 * len bytes (does not include FCS) at the given rate. Duration will
119 * also include SIFS.
120 *
121 * rate is in 100 kbps, so divident is multiplied by 10 in the
122 * DIV_ROUND_UP() operations.
123 *
124 * shift may be 2 for 5 MHz channels or 1 for 10 MHz channels, and
125 * is assumed to be 0 otherwise.
126 */
127
128 if (band == IEEE80211_BAND_5GHZ || erp) {
129 /*
130 * OFDM:
131 *
132 * N_DBPS = DATARATE x 4
133 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
134 * (16 = SIGNAL time, 6 = tail bits)
135 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
136 *
137 * T_SYM = 4 usec
138 * 802.11a - 18.5.2: aSIFSTime = 16 usec
139 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
140 * signal ext = 6 usec
141 */
142 dur = 16; /* SIFS + signal ext */
143 dur += 16; /* IEEE 802.11-2012 18.3.2.4: T_PREAMBLE = 16 usec */
144 dur += 4; /* IEEE 802.11-2012 18.3.2.4: T_SIGNAL = 4 usec */
145
146 /* IEEE 802.11-2012 18.3.2.4: all values above are:
147 * * times 4 for 5 MHz
148 * * times 2 for 10 MHz
149 */
150 dur *= 1 << shift;
151
152 /* rates should already consider the channel bandwidth,
153 * don't apply divisor again.
154 */
155 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
156 4 * rate); /* T_SYM x N_SYM */
157 } else {
158 /*
159 * 802.11b or 802.11g with 802.11b compatibility:
160 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
161 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
162 *
163 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
164 * aSIFSTime = 10 usec
165 * aPreambleLength = 144 usec or 72 usec with short preamble
166 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
167 */
168 dur = 10; /* aSIFSTime = 10 usec */
169 dur += short_preamble ? (72 + 24) : (144 + 48);
170
171 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
172 }
173
174 return dur;
175 }
176
177 /* Exported duration function for driver use */
178 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
179 struct ieee80211_vif *vif,
180 enum ieee80211_band band,
181 size_t frame_len,
182 struct ieee80211_rate *rate)
183 {
184 struct ieee80211_sub_if_data *sdata;
185 u16 dur;
186 int erp, shift = 0;
187 bool short_preamble = false;
188
189 erp = 0;
190 if (vif) {
191 sdata = vif_to_sdata(vif);
192 short_preamble = sdata->vif.bss_conf.use_short_preamble;
193 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
194 erp = rate->flags & IEEE80211_RATE_ERP_G;
195 shift = ieee80211_vif_get_shift(vif);
196 }
197
198 dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
199 short_preamble, shift);
200
201 return cpu_to_le16(dur);
202 }
203 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
204
205 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
206 struct ieee80211_vif *vif, size_t frame_len,
207 const struct ieee80211_tx_info *frame_txctl)
208 {
209 struct ieee80211_local *local = hw_to_local(hw);
210 struct ieee80211_rate *rate;
211 struct ieee80211_sub_if_data *sdata;
212 bool short_preamble;
213 int erp, shift = 0, bitrate;
214 u16 dur;
215 struct ieee80211_supported_band *sband;
216
217 sband = local->hw.wiphy->bands[frame_txctl->band];
218
219 short_preamble = false;
220
221 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
222
223 erp = 0;
224 if (vif) {
225 sdata = vif_to_sdata(vif);
226 short_preamble = sdata->vif.bss_conf.use_short_preamble;
227 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
228 erp = rate->flags & IEEE80211_RATE_ERP_G;
229 shift = ieee80211_vif_get_shift(vif);
230 }
231
232 bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
233
234 /* CTS duration */
235 dur = ieee80211_frame_duration(sband->band, 10, bitrate,
236 erp, short_preamble, shift);
237 /* Data frame duration */
238 dur += ieee80211_frame_duration(sband->band, frame_len, bitrate,
239 erp, short_preamble, shift);
240 /* ACK duration */
241 dur += ieee80211_frame_duration(sband->band, 10, bitrate,
242 erp, short_preamble, shift);
243
244 return cpu_to_le16(dur);
245 }
246 EXPORT_SYMBOL(ieee80211_rts_duration);
247
248 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
249 struct ieee80211_vif *vif,
250 size_t frame_len,
251 const struct ieee80211_tx_info *frame_txctl)
252 {
253 struct ieee80211_local *local = hw_to_local(hw);
254 struct ieee80211_rate *rate;
255 struct ieee80211_sub_if_data *sdata;
256 bool short_preamble;
257 int erp, shift = 0, bitrate;
258 u16 dur;
259 struct ieee80211_supported_band *sband;
260
261 sband = local->hw.wiphy->bands[frame_txctl->band];
262
263 short_preamble = false;
264
265 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
266 erp = 0;
267 if (vif) {
268 sdata = vif_to_sdata(vif);
269 short_preamble = sdata->vif.bss_conf.use_short_preamble;
270 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
271 erp = rate->flags & IEEE80211_RATE_ERP_G;
272 shift = ieee80211_vif_get_shift(vif);
273 }
274
275 bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
276
277 /* Data frame duration */
278 dur = ieee80211_frame_duration(sband->band, frame_len, bitrate,
279 erp, short_preamble, shift);
280 if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
281 /* ACK duration */
282 dur += ieee80211_frame_duration(sband->band, 10, bitrate,
283 erp, short_preamble, shift);
284 }
285
286 return cpu_to_le16(dur);
287 }
288 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
289
290 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
291 {
292 struct ieee80211_sub_if_data *sdata;
293 int n_acs = IEEE80211_NUM_ACS;
294
295 if (local->hw.queues < IEEE80211_NUM_ACS)
296 n_acs = 1;
297
298 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
299 int ac;
300
301 if (!sdata->dev)
302 continue;
303
304 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
305 local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
306 continue;
307
308 for (ac = 0; ac < n_acs; ac++) {
309 int ac_queue = sdata->vif.hw_queue[ac];
310
311 if (ac_queue == queue ||
312 (sdata->vif.cab_queue == queue &&
313 local->queue_stop_reasons[ac_queue] == 0 &&
314 skb_queue_empty(&local->pending[ac_queue])))
315 netif_wake_subqueue(sdata->dev, ac);
316 }
317 }
318 }
319
320 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
321 enum queue_stop_reason reason,
322 bool refcounted)
323 {
324 struct ieee80211_local *local = hw_to_local(hw);
325
326 trace_wake_queue(local, queue, reason);
327
328 if (WARN_ON(queue >= hw->queues))
329 return;
330
331 if (!test_bit(reason, &local->queue_stop_reasons[queue]))
332 return;
333
334 if (!refcounted)
335 local->q_stop_reasons[queue][reason] = 0;
336 else
337 local->q_stop_reasons[queue][reason]--;
338
339 if (local->q_stop_reasons[queue][reason] == 0)
340 __clear_bit(reason, &local->queue_stop_reasons[queue]);
341
342 if (local->queue_stop_reasons[queue] != 0)
343 /* someone still has this queue stopped */
344 return;
345
346 if (skb_queue_empty(&local->pending[queue])) {
347 rcu_read_lock();
348 ieee80211_propagate_queue_wake(local, queue);
349 rcu_read_unlock();
350 } else
351 tasklet_schedule(&local->tx_pending_tasklet);
352 }
353
354 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
355 enum queue_stop_reason reason,
356 bool refcounted)
357 {
358 struct ieee80211_local *local = hw_to_local(hw);
359 unsigned long flags;
360
361 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
362 __ieee80211_wake_queue(hw, queue, reason, refcounted);
363 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
364 }
365
366 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
367 {
368 ieee80211_wake_queue_by_reason(hw, queue,
369 IEEE80211_QUEUE_STOP_REASON_DRIVER,
370 false);
371 }
372 EXPORT_SYMBOL(ieee80211_wake_queue);
373
374 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
375 enum queue_stop_reason reason,
376 bool refcounted)
377 {
378 struct ieee80211_local *local = hw_to_local(hw);
379 struct ieee80211_sub_if_data *sdata;
380 int n_acs = IEEE80211_NUM_ACS;
381
382 trace_stop_queue(local, queue, reason);
383
384 if (WARN_ON(queue >= hw->queues))
385 return;
386
387 if (!refcounted)
388 local->q_stop_reasons[queue][reason] = 1;
389 else
390 local->q_stop_reasons[queue][reason]++;
391
392 if (__test_and_set_bit(reason, &local->queue_stop_reasons[queue]))
393 return;
394
395 if (local->hw.queues < IEEE80211_NUM_ACS)
396 n_acs = 1;
397
398 rcu_read_lock();
399 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
400 int ac;
401
402 if (!sdata->dev)
403 continue;
404
405 for (ac = 0; ac < n_acs; ac++) {
406 if (sdata->vif.hw_queue[ac] == queue ||
407 sdata->vif.cab_queue == queue)
408 netif_stop_subqueue(sdata->dev, ac);
409 }
410 }
411 rcu_read_unlock();
412 }
413
414 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
415 enum queue_stop_reason reason,
416 bool refcounted)
417 {
418 struct ieee80211_local *local = hw_to_local(hw);
419 unsigned long flags;
420
421 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
422 __ieee80211_stop_queue(hw, queue, reason, refcounted);
423 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
424 }
425
426 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
427 {
428 ieee80211_stop_queue_by_reason(hw, queue,
429 IEEE80211_QUEUE_STOP_REASON_DRIVER,
430 false);
431 }
432 EXPORT_SYMBOL(ieee80211_stop_queue);
433
434 void ieee80211_add_pending_skb(struct ieee80211_local *local,
435 struct sk_buff *skb)
436 {
437 struct ieee80211_hw *hw = &local->hw;
438 unsigned long flags;
439 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
440 int queue = info->hw_queue;
441
442 if (WARN_ON(!info->control.vif)) {
443 ieee80211_free_txskb(&local->hw, skb);
444 return;
445 }
446
447 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
448 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
449 false);
450 __skb_queue_tail(&local->pending[queue], skb);
451 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
452 false);
453 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
454 }
455
456 void ieee80211_add_pending_skbs(struct ieee80211_local *local,
457 struct sk_buff_head *skbs)
458 {
459 struct ieee80211_hw *hw = &local->hw;
460 struct sk_buff *skb;
461 unsigned long flags;
462 int queue, i;
463
464 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
465 while ((skb = skb_dequeue(skbs))) {
466 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
467
468 if (WARN_ON(!info->control.vif)) {
469 ieee80211_free_txskb(&local->hw, skb);
470 continue;
471 }
472
473 queue = info->hw_queue;
474
475 __ieee80211_stop_queue(hw, queue,
476 IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
477 false);
478
479 __skb_queue_tail(&local->pending[queue], skb);
480 }
481
482 for (i = 0; i < hw->queues; i++)
483 __ieee80211_wake_queue(hw, i,
484 IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
485 false);
486 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
487 }
488
489 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
490 unsigned long queues,
491 enum queue_stop_reason reason,
492 bool refcounted)
493 {
494 struct ieee80211_local *local = hw_to_local(hw);
495 unsigned long flags;
496 int i;
497
498 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
499
500 for_each_set_bit(i, &queues, hw->queues)
501 __ieee80211_stop_queue(hw, i, reason, refcounted);
502
503 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
504 }
505
506 void ieee80211_stop_queues(struct ieee80211_hw *hw)
507 {
508 ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
509 IEEE80211_QUEUE_STOP_REASON_DRIVER,
510 false);
511 }
512 EXPORT_SYMBOL(ieee80211_stop_queues);
513
514 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
515 {
516 struct ieee80211_local *local = hw_to_local(hw);
517 unsigned long flags;
518 int ret;
519
520 if (WARN_ON(queue >= hw->queues))
521 return true;
522
523 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
524 ret = test_bit(IEEE80211_QUEUE_STOP_REASON_DRIVER,
525 &local->queue_stop_reasons[queue]);
526 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
527 return ret;
528 }
529 EXPORT_SYMBOL(ieee80211_queue_stopped);
530
531 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
532 unsigned long queues,
533 enum queue_stop_reason reason,
534 bool refcounted)
535 {
536 struct ieee80211_local *local = hw_to_local(hw);
537 unsigned long flags;
538 int i;
539
540 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
541
542 for_each_set_bit(i, &queues, hw->queues)
543 __ieee80211_wake_queue(hw, i, reason, refcounted);
544
545 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
546 }
547
548 void ieee80211_wake_queues(struct ieee80211_hw *hw)
549 {
550 ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
551 IEEE80211_QUEUE_STOP_REASON_DRIVER,
552 false);
553 }
554 EXPORT_SYMBOL(ieee80211_wake_queues);
555
556 static unsigned int
557 ieee80211_get_vif_queues(struct ieee80211_local *local,
558 struct ieee80211_sub_if_data *sdata)
559 {
560 unsigned int queues;
561
562 if (sdata && local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
563 int ac;
564
565 queues = 0;
566
567 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
568 queues |= BIT(sdata->vif.hw_queue[ac]);
569 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
570 queues |= BIT(sdata->vif.cab_queue);
571 } else {
572 /* all queues */
573 queues = BIT(local->hw.queues) - 1;
574 }
575
576 return queues;
577 }
578
579 void ieee80211_flush_queues(struct ieee80211_local *local,
580 struct ieee80211_sub_if_data *sdata)
581 {
582 unsigned int queues;
583
584 if (!local->ops->flush)
585 return;
586
587 queues = ieee80211_get_vif_queues(local, sdata);
588
589 ieee80211_stop_queues_by_reason(&local->hw, queues,
590 IEEE80211_QUEUE_STOP_REASON_FLUSH,
591 false);
592
593 drv_flush(local, sdata, queues, false);
594
595 ieee80211_wake_queues_by_reason(&local->hw, queues,
596 IEEE80211_QUEUE_STOP_REASON_FLUSH,
597 false);
598 }
599
600 void ieee80211_stop_vif_queues(struct ieee80211_local *local,
601 struct ieee80211_sub_if_data *sdata,
602 enum queue_stop_reason reason)
603 {
604 ieee80211_stop_queues_by_reason(&local->hw,
605 ieee80211_get_vif_queues(local, sdata),
606 reason, true);
607 }
608
609 void ieee80211_wake_vif_queues(struct ieee80211_local *local,
610 struct ieee80211_sub_if_data *sdata,
611 enum queue_stop_reason reason)
612 {
613 ieee80211_wake_queues_by_reason(&local->hw,
614 ieee80211_get_vif_queues(local, sdata),
615 reason, true);
616 }
617
618 static void __iterate_active_interfaces(struct ieee80211_local *local,
619 u32 iter_flags,
620 void (*iterator)(void *data, u8 *mac,
621 struct ieee80211_vif *vif),
622 void *data)
623 {
624 struct ieee80211_sub_if_data *sdata;
625
626 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
627 switch (sdata->vif.type) {
628 case NL80211_IFTYPE_MONITOR:
629 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
630 continue;
631 break;
632 case NL80211_IFTYPE_AP_VLAN:
633 continue;
634 default:
635 break;
636 }
637 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
638 !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
639 continue;
640 if (ieee80211_sdata_running(sdata))
641 iterator(data, sdata->vif.addr,
642 &sdata->vif);
643 }
644
645 sdata = rcu_dereference_check(local->monitor_sdata,
646 lockdep_is_held(&local->iflist_mtx) ||
647 lockdep_rtnl_is_held());
648 if (sdata &&
649 (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
650 sdata->flags & IEEE80211_SDATA_IN_DRIVER))
651 iterator(data, sdata->vif.addr, &sdata->vif);
652 }
653
654 void ieee80211_iterate_active_interfaces(
655 struct ieee80211_hw *hw, u32 iter_flags,
656 void (*iterator)(void *data, u8 *mac,
657 struct ieee80211_vif *vif),
658 void *data)
659 {
660 struct ieee80211_local *local = hw_to_local(hw);
661
662 mutex_lock(&local->iflist_mtx);
663 __iterate_active_interfaces(local, iter_flags, iterator, data);
664 mutex_unlock(&local->iflist_mtx);
665 }
666 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
667
668 void ieee80211_iterate_active_interfaces_atomic(
669 struct ieee80211_hw *hw, u32 iter_flags,
670 void (*iterator)(void *data, u8 *mac,
671 struct ieee80211_vif *vif),
672 void *data)
673 {
674 struct ieee80211_local *local = hw_to_local(hw);
675
676 rcu_read_lock();
677 __iterate_active_interfaces(local, iter_flags, iterator, data);
678 rcu_read_unlock();
679 }
680 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
681
682 void ieee80211_iterate_active_interfaces_rtnl(
683 struct ieee80211_hw *hw, u32 iter_flags,
684 void (*iterator)(void *data, u8 *mac,
685 struct ieee80211_vif *vif),
686 void *data)
687 {
688 struct ieee80211_local *local = hw_to_local(hw);
689
690 ASSERT_RTNL();
691
692 __iterate_active_interfaces(local, iter_flags, iterator, data);
693 }
694 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_rtnl);
695
696 static void __iterate_stations(struct ieee80211_local *local,
697 void (*iterator)(void *data,
698 struct ieee80211_sta *sta),
699 void *data)
700 {
701 struct sta_info *sta;
702
703 list_for_each_entry_rcu(sta, &local->sta_list, list) {
704 if (!sta->uploaded)
705 continue;
706
707 iterator(data, &sta->sta);
708 }
709 }
710
711 void ieee80211_iterate_stations_atomic(struct ieee80211_hw *hw,
712 void (*iterator)(void *data,
713 struct ieee80211_sta *sta),
714 void *data)
715 {
716 struct ieee80211_local *local = hw_to_local(hw);
717
718 rcu_read_lock();
719 __iterate_stations(local, iterator, data);
720 rcu_read_unlock();
721 }
722 EXPORT_SYMBOL_GPL(ieee80211_iterate_stations_atomic);
723
724 struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev)
725 {
726 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
727
728 if (!ieee80211_sdata_running(sdata) ||
729 !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
730 return NULL;
731 return &sdata->vif;
732 }
733 EXPORT_SYMBOL_GPL(wdev_to_ieee80211_vif);
734
735 /*
736 * Nothing should have been stuffed into the workqueue during
737 * the suspend->resume cycle. If this WARN is seen then there
738 * is a bug with either the driver suspend or something in
739 * mac80211 stuffing into the workqueue which we haven't yet
740 * cleared during mac80211's suspend cycle.
741 */
742 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
743 {
744 if (WARN(local->suspended && !local->resuming,
745 "queueing ieee80211 work while going to suspend\n"))
746 return false;
747
748 return true;
749 }
750
751 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
752 {
753 struct ieee80211_local *local = hw_to_local(hw);
754
755 if (!ieee80211_can_queue_work(local))
756 return;
757
758 queue_work(local->workqueue, work);
759 }
760 EXPORT_SYMBOL(ieee80211_queue_work);
761
762 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
763 struct delayed_work *dwork,
764 unsigned long delay)
765 {
766 struct ieee80211_local *local = hw_to_local(hw);
767
768 if (!ieee80211_can_queue_work(local))
769 return;
770
771 queue_delayed_work(local->workqueue, dwork, delay);
772 }
773 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
774
775 u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
776 struct ieee802_11_elems *elems,
777 u64 filter, u32 crc)
778 {
779 size_t left = len;
780 const u8 *pos = start;
781 bool calc_crc = filter != 0;
782 DECLARE_BITMAP(seen_elems, 256);
783 const u8 *ie;
784
785 bitmap_zero(seen_elems, 256);
786 memset(elems, 0, sizeof(*elems));
787 elems->ie_start = start;
788 elems->total_len = len;
789
790 while (left >= 2) {
791 u8 id, elen;
792 bool elem_parse_failed;
793
794 id = *pos++;
795 elen = *pos++;
796 left -= 2;
797
798 if (elen > left) {
799 elems->parse_error = true;
800 break;
801 }
802
803 switch (id) {
804 case WLAN_EID_SSID:
805 case WLAN_EID_SUPP_RATES:
806 case WLAN_EID_FH_PARAMS:
807 case WLAN_EID_DS_PARAMS:
808 case WLAN_EID_CF_PARAMS:
809 case WLAN_EID_TIM:
810 case WLAN_EID_IBSS_PARAMS:
811 case WLAN_EID_CHALLENGE:
812 case WLAN_EID_RSN:
813 case WLAN_EID_ERP_INFO:
814 case WLAN_EID_EXT_SUPP_RATES:
815 case WLAN_EID_HT_CAPABILITY:
816 case WLAN_EID_HT_OPERATION:
817 case WLAN_EID_VHT_CAPABILITY:
818 case WLAN_EID_VHT_OPERATION:
819 case WLAN_EID_MESH_ID:
820 case WLAN_EID_MESH_CONFIG:
821 case WLAN_EID_PEER_MGMT:
822 case WLAN_EID_PREQ:
823 case WLAN_EID_PREP:
824 case WLAN_EID_PERR:
825 case WLAN_EID_RANN:
826 case WLAN_EID_CHANNEL_SWITCH:
827 case WLAN_EID_EXT_CHANSWITCH_ANN:
828 case WLAN_EID_COUNTRY:
829 case WLAN_EID_PWR_CONSTRAINT:
830 case WLAN_EID_TIMEOUT_INTERVAL:
831 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
832 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
833 case WLAN_EID_CHAN_SWITCH_PARAM:
834 case WLAN_EID_EXT_CAPABILITY:
835 /*
836 * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
837 * that if the content gets bigger it might be needed more than once
838 */
839 if (test_bit(id, seen_elems)) {
840 elems->parse_error = true;
841 left -= elen;
842 pos += elen;
843 continue;
844 }
845 break;
846 }
847
848 if (calc_crc && id < 64 && (filter & (1ULL << id)))
849 crc = crc32_be(crc, pos - 2, elen + 2);
850
851 elem_parse_failed = false;
852
853 switch (id) {
854 case WLAN_EID_EXT_CAPABILITY:
855 elems->ext_capab = pos;
856 elems->ext_capab_len = elen;
857 break;
858 case WLAN_EID_SSID:
859 elems->ssid = pos;
860 elems->ssid_len = elen;
861 break;
862 case WLAN_EID_SUPP_RATES:
863 elems->supp_rates = pos;
864 elems->supp_rates_len = elen;
865 break;
866 case WLAN_EID_DS_PARAMS:
867 if (elen >= 1)
868 elems->ds_params = pos;
869 else
870 elem_parse_failed = true;
871 break;
872 case WLAN_EID_TIM:
873 if (elen >= sizeof(struct ieee80211_tim_ie)) {
874 elems->tim = (void *)pos;
875 elems->tim_len = elen;
876 } else
877 elem_parse_failed = true;
878 break;
879 case WLAN_EID_CHALLENGE:
880 elems->challenge = pos;
881 elems->challenge_len = elen;
882 break;
883 case WLAN_EID_VENDOR_SPECIFIC:
884 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
885 pos[2] == 0xf2) {
886 /* Microsoft OUI (00:50:F2) */
887
888 if (calc_crc)
889 crc = crc32_be(crc, pos - 2, elen + 2);
890
891 if (elen >= 5 && pos[3] == 2) {
892 /* OUI Type 2 - WMM IE */
893 if (pos[4] == 0) {
894 elems->wmm_info = pos;
895 elems->wmm_info_len = elen;
896 } else if (pos[4] == 1) {
897 elems->wmm_param = pos;
898 elems->wmm_param_len = elen;
899 }
900 }
901 }
902 break;
903 case WLAN_EID_RSN:
904 elems->rsn = pos;
905 elems->rsn_len = elen;
906 break;
907 case WLAN_EID_ERP_INFO:
908 if (elen >= 1)
909 elems->erp_info = pos;
910 else
911 elem_parse_failed = true;
912 break;
913 case WLAN_EID_EXT_SUPP_RATES:
914 elems->ext_supp_rates = pos;
915 elems->ext_supp_rates_len = elen;
916 break;
917 case WLAN_EID_HT_CAPABILITY:
918 if (elen >= sizeof(struct ieee80211_ht_cap))
919 elems->ht_cap_elem = (void *)pos;
920 else
921 elem_parse_failed = true;
922 break;
923 case WLAN_EID_HT_OPERATION:
924 if (elen >= sizeof(struct ieee80211_ht_operation))
925 elems->ht_operation = (void *)pos;
926 else
927 elem_parse_failed = true;
928 break;
929 case WLAN_EID_VHT_CAPABILITY:
930 if (elen >= sizeof(struct ieee80211_vht_cap))
931 elems->vht_cap_elem = (void *)pos;
932 else
933 elem_parse_failed = true;
934 break;
935 case WLAN_EID_VHT_OPERATION:
936 if (elen >= sizeof(struct ieee80211_vht_operation))
937 elems->vht_operation = (void *)pos;
938 else
939 elem_parse_failed = true;
940 break;
941 case WLAN_EID_OPMODE_NOTIF:
942 if (elen > 0)
943 elems->opmode_notif = pos;
944 else
945 elem_parse_failed = true;
946 break;
947 case WLAN_EID_MESH_ID:
948 elems->mesh_id = pos;
949 elems->mesh_id_len = elen;
950 break;
951 case WLAN_EID_MESH_CONFIG:
952 if (elen >= sizeof(struct ieee80211_meshconf_ie))
953 elems->mesh_config = (void *)pos;
954 else
955 elem_parse_failed = true;
956 break;
957 case WLAN_EID_PEER_MGMT:
958 elems->peering = pos;
959 elems->peering_len = elen;
960 break;
961 case WLAN_EID_MESH_AWAKE_WINDOW:
962 if (elen >= 2)
963 elems->awake_window = (void *)pos;
964 break;
965 case WLAN_EID_PREQ:
966 elems->preq = pos;
967 elems->preq_len = elen;
968 break;
969 case WLAN_EID_PREP:
970 elems->prep = pos;
971 elems->prep_len = elen;
972 break;
973 case WLAN_EID_PERR:
974 elems->perr = pos;
975 elems->perr_len = elen;
976 break;
977 case WLAN_EID_RANN:
978 if (elen >= sizeof(struct ieee80211_rann_ie))
979 elems->rann = (void *)pos;
980 else
981 elem_parse_failed = true;
982 break;
983 case WLAN_EID_CHANNEL_SWITCH:
984 if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
985 elem_parse_failed = true;
986 break;
987 }
988 elems->ch_switch_ie = (void *)pos;
989 break;
990 case WLAN_EID_EXT_CHANSWITCH_ANN:
991 if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
992 elem_parse_failed = true;
993 break;
994 }
995 elems->ext_chansw_ie = (void *)pos;
996 break;
997 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
998 if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
999 elem_parse_failed = true;
1000 break;
1001 }
1002 elems->sec_chan_offs = (void *)pos;
1003 break;
1004 case WLAN_EID_CHAN_SWITCH_PARAM:
1005 if (elen !=
1006 sizeof(*elems->mesh_chansw_params_ie)) {
1007 elem_parse_failed = true;
1008 break;
1009 }
1010 elems->mesh_chansw_params_ie = (void *)pos;
1011 break;
1012 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
1013 if (!action ||
1014 elen != sizeof(*elems->wide_bw_chansw_ie)) {
1015 elem_parse_failed = true;
1016 break;
1017 }
1018 elems->wide_bw_chansw_ie = (void *)pos;
1019 break;
1020 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
1021 if (action) {
1022 elem_parse_failed = true;
1023 break;
1024 }
1025 /*
1026 * This is a bit tricky, but as we only care about
1027 * the wide bandwidth channel switch element, so
1028 * just parse it out manually.
1029 */
1030 ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
1031 pos, elen);
1032 if (ie) {
1033 if (ie[1] == sizeof(*elems->wide_bw_chansw_ie))
1034 elems->wide_bw_chansw_ie =
1035 (void *)(ie + 2);
1036 else
1037 elem_parse_failed = true;
1038 }
1039 break;
1040 case WLAN_EID_COUNTRY:
1041 elems->country_elem = pos;
1042 elems->country_elem_len = elen;
1043 break;
1044 case WLAN_EID_PWR_CONSTRAINT:
1045 if (elen != 1) {
1046 elem_parse_failed = true;
1047 break;
1048 }
1049 elems->pwr_constr_elem = pos;
1050 break;
1051 case WLAN_EID_CISCO_VENDOR_SPECIFIC:
1052 /* Lots of different options exist, but we only care
1053 * about the Dynamic Transmit Power Control element.
1054 * First check for the Cisco OUI, then for the DTPC
1055 * tag (0x00).
1056 */
1057 if (elen < 4) {
1058 elem_parse_failed = true;
1059 break;
1060 }
1061
1062 if (pos[0] != 0x00 || pos[1] != 0x40 ||
1063 pos[2] != 0x96 || pos[3] != 0x00)
1064 break;
1065
1066 if (elen != 6) {
1067 elem_parse_failed = true;
1068 break;
1069 }
1070
1071 if (calc_crc)
1072 crc = crc32_be(crc, pos - 2, elen + 2);
1073
1074 elems->cisco_dtpc_elem = pos;
1075 break;
1076 case WLAN_EID_TIMEOUT_INTERVAL:
1077 if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
1078 elems->timeout_int = (void *)pos;
1079 else
1080 elem_parse_failed = true;
1081 break;
1082 default:
1083 break;
1084 }
1085
1086 if (elem_parse_failed)
1087 elems->parse_error = true;
1088 else
1089 __set_bit(id, seen_elems);
1090
1091 left -= elen;
1092 pos += elen;
1093 }
1094
1095 if (left != 0)
1096 elems->parse_error = true;
1097
1098 return crc;
1099 }
1100
1101 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
1102 bool bss_notify)
1103 {
1104 struct ieee80211_local *local = sdata->local;
1105 struct ieee80211_tx_queue_params qparam;
1106 struct ieee80211_chanctx_conf *chanctx_conf;
1107 int ac;
1108 bool use_11b, enable_qos;
1109 bool is_ocb; /* Use another EDCA parameters if dot11OCBActivated=true */
1110 int aCWmin, aCWmax;
1111
1112 if (!local->ops->conf_tx)
1113 return;
1114
1115 if (local->hw.queues < IEEE80211_NUM_ACS)
1116 return;
1117
1118 memset(&qparam, 0, sizeof(qparam));
1119
1120 rcu_read_lock();
1121 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1122 use_11b = (chanctx_conf &&
1123 chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) &&
1124 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
1125 rcu_read_unlock();
1126
1127 /*
1128 * By default disable QoS in STA mode for old access points, which do
1129 * not support 802.11e. New APs will provide proper queue parameters,
1130 * that we will configure later.
1131 */
1132 enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
1133
1134 is_ocb = (sdata->vif.type == NL80211_IFTYPE_OCB);
1135
1136 /* Set defaults according to 802.11-2007 Table 7-37 */
1137 aCWmax = 1023;
1138 if (use_11b)
1139 aCWmin = 31;
1140 else
1141 aCWmin = 15;
1142
1143 /* Confiure old 802.11b/g medium access rules. */
1144 qparam.cw_max = aCWmax;
1145 qparam.cw_min = aCWmin;
1146 qparam.txop = 0;
1147 qparam.aifs = 2;
1148
1149 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1150 /* Update if QoS is enabled. */
1151 if (enable_qos) {
1152 switch (ac) {
1153 case IEEE80211_AC_BK:
1154 qparam.cw_max = aCWmax;
1155 qparam.cw_min = aCWmin;
1156 qparam.txop = 0;
1157 if (is_ocb)
1158 qparam.aifs = 9;
1159 else
1160 qparam.aifs = 7;
1161 break;
1162 /* never happens but let's not leave undefined */
1163 default:
1164 case IEEE80211_AC_BE:
1165 qparam.cw_max = aCWmax;
1166 qparam.cw_min = aCWmin;
1167 qparam.txop = 0;
1168 if (is_ocb)
1169 qparam.aifs = 6;
1170 else
1171 qparam.aifs = 3;
1172 break;
1173 case IEEE80211_AC_VI:
1174 qparam.cw_max = aCWmin;
1175 qparam.cw_min = (aCWmin + 1) / 2 - 1;
1176 if (is_ocb)
1177 qparam.txop = 0;
1178 else if (use_11b)
1179 qparam.txop = 6016/32;
1180 else
1181 qparam.txop = 3008/32;
1182
1183 if (is_ocb)
1184 qparam.aifs = 3;
1185 else
1186 qparam.aifs = 2;
1187 break;
1188 case IEEE80211_AC_VO:
1189 qparam.cw_max = (aCWmin + 1) / 2 - 1;
1190 qparam.cw_min = (aCWmin + 1) / 4 - 1;
1191 if (is_ocb)
1192 qparam.txop = 0;
1193 else if (use_11b)
1194 qparam.txop = 3264/32;
1195 else
1196 qparam.txop = 1504/32;
1197 qparam.aifs = 2;
1198 break;
1199 }
1200 }
1201
1202 qparam.uapsd = false;
1203
1204 sdata->tx_conf[ac] = qparam;
1205 drv_conf_tx(local, sdata, ac, &qparam);
1206 }
1207
1208 if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1209 sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
1210 sdata->vif.bss_conf.qos = enable_qos;
1211 if (bss_notify)
1212 ieee80211_bss_info_change_notify(sdata,
1213 BSS_CHANGED_QOS);
1214 }
1215 }
1216
1217 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1218 u16 transaction, u16 auth_alg, u16 status,
1219 const u8 *extra, size_t extra_len, const u8 *da,
1220 const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1221 u32 tx_flags)
1222 {
1223 struct ieee80211_local *local = sdata->local;
1224 struct sk_buff *skb;
1225 struct ieee80211_mgmt *mgmt;
1226 int err;
1227
1228 /* 24 + 6 = header + auth_algo + auth_transaction + status_code */
1229 skb = dev_alloc_skb(local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN +
1230 24 + 6 + extra_len + IEEE80211_WEP_ICV_LEN);
1231 if (!skb)
1232 return;
1233
1234 skb_reserve(skb, local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN);
1235
1236 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1237 memset(mgmt, 0, 24 + 6);
1238 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1239 IEEE80211_STYPE_AUTH);
1240 memcpy(mgmt->da, da, ETH_ALEN);
1241 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1242 memcpy(mgmt->bssid, bssid, ETH_ALEN);
1243 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1244 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1245 mgmt->u.auth.status_code = cpu_to_le16(status);
1246 if (extra)
1247 memcpy(skb_put(skb, extra_len), extra, extra_len);
1248
1249 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1250 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1251 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1252 WARN_ON(err);
1253 }
1254
1255 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1256 tx_flags;
1257 ieee80211_tx_skb(sdata, skb);
1258 }
1259
1260 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1261 const u8 *bssid, u16 stype, u16 reason,
1262 bool send_frame, u8 *frame_buf)
1263 {
1264 struct ieee80211_local *local = sdata->local;
1265 struct sk_buff *skb;
1266 struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1267
1268 /* build frame */
1269 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1270 mgmt->duration = 0; /* initialize only */
1271 mgmt->seq_ctrl = 0; /* initialize only */
1272 memcpy(mgmt->da, bssid, ETH_ALEN);
1273 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1274 memcpy(mgmt->bssid, bssid, ETH_ALEN);
1275 /* u.deauth.reason_code == u.disassoc.reason_code */
1276 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1277
1278 if (send_frame) {
1279 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1280 IEEE80211_DEAUTH_FRAME_LEN);
1281 if (!skb)
1282 return;
1283
1284 skb_reserve(skb, local->hw.extra_tx_headroom);
1285
1286 /* copy in frame */
1287 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1288 mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1289
1290 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1291 !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1292 IEEE80211_SKB_CB(skb)->flags |=
1293 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1294
1295 ieee80211_tx_skb(sdata, skb);
1296 }
1297 }
1298
1299 static int ieee80211_build_preq_ies_band(struct ieee80211_local *local,
1300 u8 *buffer, size_t buffer_len,
1301 const u8 *ie, size_t ie_len,
1302 enum ieee80211_band band,
1303 u32 rate_mask,
1304 struct cfg80211_chan_def *chandef,
1305 size_t *offset)
1306 {
1307 struct ieee80211_supported_band *sband;
1308 u8 *pos = buffer, *end = buffer + buffer_len;
1309 size_t noffset;
1310 int supp_rates_len, i;
1311 u8 rates[32];
1312 int num_rates;
1313 int ext_rates_len;
1314 int shift;
1315 u32 rate_flags;
1316
1317 *offset = 0;
1318
1319 sband = local->hw.wiphy->bands[band];
1320 if (WARN_ON_ONCE(!sband))
1321 return 0;
1322
1323 rate_flags = ieee80211_chandef_rate_flags(chandef);
1324 shift = ieee80211_chandef_get_shift(chandef);
1325
1326 num_rates = 0;
1327 for (i = 0; i < sband->n_bitrates; i++) {
1328 if ((BIT(i) & rate_mask) == 0)
1329 continue; /* skip rate */
1330 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1331 continue;
1332
1333 rates[num_rates++] =
1334 (u8) DIV_ROUND_UP(sband->bitrates[i].bitrate,
1335 (1 << shift) * 5);
1336 }
1337
1338 supp_rates_len = min_t(int, num_rates, 8);
1339
1340 if (end - pos < 2 + supp_rates_len)
1341 goto out_err;
1342 *pos++ = WLAN_EID_SUPP_RATES;
1343 *pos++ = supp_rates_len;
1344 memcpy(pos, rates, supp_rates_len);
1345 pos += supp_rates_len;
1346
1347 /* insert "request information" if in custom IEs */
1348 if (ie && ie_len) {
1349 static const u8 before_extrates[] = {
1350 WLAN_EID_SSID,
1351 WLAN_EID_SUPP_RATES,
1352 WLAN_EID_REQUEST,
1353 };
1354 noffset = ieee80211_ie_split(ie, ie_len,
1355 before_extrates,
1356 ARRAY_SIZE(before_extrates),
1357 *offset);
1358 if (end - pos < noffset - *offset)
1359 goto out_err;
1360 memcpy(pos, ie + *offset, noffset - *offset);
1361 pos += noffset - *offset;
1362 *offset = noffset;
1363 }
1364
1365 ext_rates_len = num_rates - supp_rates_len;
1366 if (ext_rates_len > 0) {
1367 if (end - pos < 2 + ext_rates_len)
1368 goto out_err;
1369 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1370 *pos++ = ext_rates_len;
1371 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1372 pos += ext_rates_len;
1373 }
1374
1375 if (chandef->chan && sband->band == IEEE80211_BAND_2GHZ) {
1376 if (end - pos < 3)
1377 goto out_err;
1378 *pos++ = WLAN_EID_DS_PARAMS;
1379 *pos++ = 1;
1380 *pos++ = ieee80211_frequency_to_channel(
1381 chandef->chan->center_freq);
1382 }
1383
1384 /* insert custom IEs that go before HT */
1385 if (ie && ie_len) {
1386 static const u8 before_ht[] = {
1387 WLAN_EID_SSID,
1388 WLAN_EID_SUPP_RATES,
1389 WLAN_EID_REQUEST,
1390 WLAN_EID_EXT_SUPP_RATES,
1391 WLAN_EID_DS_PARAMS,
1392 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1393 };
1394 noffset = ieee80211_ie_split(ie, ie_len,
1395 before_ht, ARRAY_SIZE(before_ht),
1396 *offset);
1397 if (end - pos < noffset - *offset)
1398 goto out_err;
1399 memcpy(pos, ie + *offset, noffset - *offset);
1400 pos += noffset - *offset;
1401 *offset = noffset;
1402 }
1403
1404 if (sband->ht_cap.ht_supported) {
1405 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1406 goto out_err;
1407 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1408 sband->ht_cap.cap);
1409 }
1410
1411 /*
1412 * If adding more here, adjust code in main.c
1413 * that calculates local->scan_ies_len.
1414 */
1415
1416 /* insert custom IEs that go before VHT */
1417 if (ie && ie_len) {
1418 static const u8 before_vht[] = {
1419 WLAN_EID_SSID,
1420 WLAN_EID_SUPP_RATES,
1421 WLAN_EID_REQUEST,
1422 WLAN_EID_EXT_SUPP_RATES,
1423 WLAN_EID_DS_PARAMS,
1424 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1425 WLAN_EID_HT_CAPABILITY,
1426 WLAN_EID_BSS_COEX_2040,
1427 WLAN_EID_EXT_CAPABILITY,
1428 WLAN_EID_SSID_LIST,
1429 WLAN_EID_CHANNEL_USAGE,
1430 WLAN_EID_INTERWORKING,
1431 /* mesh ID can't happen here */
1432 /* 60 GHz can't happen here right now */
1433 };
1434 noffset = ieee80211_ie_split(ie, ie_len,
1435 before_vht, ARRAY_SIZE(before_vht),
1436 *offset);
1437 if (end - pos < noffset - *offset)
1438 goto out_err;
1439 memcpy(pos, ie + *offset, noffset - *offset);
1440 pos += noffset - *offset;
1441 *offset = noffset;
1442 }
1443
1444 if (sband->vht_cap.vht_supported) {
1445 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1446 goto out_err;
1447 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1448 sband->vht_cap.cap);
1449 }
1450
1451 return pos - buffer;
1452 out_err:
1453 WARN_ONCE(1, "not enough space for preq IEs\n");
1454 return pos - buffer;
1455 }
1456
1457 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1458 size_t buffer_len,
1459 struct ieee80211_scan_ies *ie_desc,
1460 const u8 *ie, size_t ie_len,
1461 u8 bands_used, u32 *rate_masks,
1462 struct cfg80211_chan_def *chandef)
1463 {
1464 size_t pos = 0, old_pos = 0, custom_ie_offset = 0;
1465 int i;
1466
1467 memset(ie_desc, 0, sizeof(*ie_desc));
1468
1469 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1470 if (bands_used & BIT(i)) {
1471 pos += ieee80211_build_preq_ies_band(local,
1472 buffer + pos,
1473 buffer_len - pos,
1474 ie, ie_len, i,
1475 rate_masks[i],
1476 chandef,
1477 &custom_ie_offset);
1478 ie_desc->ies[i] = buffer + old_pos;
1479 ie_desc->len[i] = pos - old_pos;
1480 old_pos = pos;
1481 }
1482 }
1483
1484 /* add any remaining custom IEs */
1485 if (ie && ie_len) {
1486 if (WARN_ONCE(buffer_len - pos < ie_len - custom_ie_offset,
1487 "not enough space for preq custom IEs\n"))
1488 return pos;
1489 memcpy(buffer + pos, ie + custom_ie_offset,
1490 ie_len - custom_ie_offset);
1491 ie_desc->common_ies = buffer + pos;
1492 ie_desc->common_ie_len = ie_len - custom_ie_offset;
1493 pos += ie_len - custom_ie_offset;
1494 }
1495
1496 return pos;
1497 };
1498
1499 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1500 u8 *dst, u32 ratemask,
1501 struct ieee80211_channel *chan,
1502 const u8 *ssid, size_t ssid_len,
1503 const u8 *ie, size_t ie_len,
1504 bool directed)
1505 {
1506 struct ieee80211_local *local = sdata->local;
1507 struct cfg80211_chan_def chandef;
1508 struct sk_buff *skb;
1509 struct ieee80211_mgmt *mgmt;
1510 int ies_len;
1511 u32 rate_masks[IEEE80211_NUM_BANDS] = {};
1512 struct ieee80211_scan_ies dummy_ie_desc;
1513
1514 /*
1515 * Do not send DS Channel parameter for directed probe requests
1516 * in order to maximize the chance that we get a response. Some
1517 * badly-behaved APs don't respond when this parameter is included.
1518 */
1519 chandef.width = sdata->vif.bss_conf.chandef.width;
1520 if (directed)
1521 chandef.chan = NULL;
1522 else
1523 chandef.chan = chan;
1524
1525 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1526 ssid, ssid_len, 100 + ie_len);
1527 if (!skb)
1528 return NULL;
1529
1530 rate_masks[chan->band] = ratemask;
1531 ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1532 skb_tailroom(skb), &dummy_ie_desc,
1533 ie, ie_len, BIT(chan->band),
1534 rate_masks, &chandef);
1535 skb_put(skb, ies_len);
1536
1537 if (dst) {
1538 mgmt = (struct ieee80211_mgmt *) skb->data;
1539 memcpy(mgmt->da, dst, ETH_ALEN);
1540 memcpy(mgmt->bssid, dst, ETH_ALEN);
1541 }
1542
1543 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1544
1545 return skb;
1546 }
1547
1548 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1549 const u8 *ssid, size_t ssid_len,
1550 const u8 *ie, size_t ie_len,
1551 u32 ratemask, bool directed, u32 tx_flags,
1552 struct ieee80211_channel *channel, bool scan)
1553 {
1554 struct sk_buff *skb;
1555
1556 skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1557 ssid, ssid_len,
1558 ie, ie_len, directed);
1559 if (skb) {
1560 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
1561 if (scan)
1562 ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1563 else
1564 ieee80211_tx_skb(sdata, skb);
1565 }
1566 }
1567
1568 u32 ieee80211_sta_get_rates(struct ieee80211_sub_if_data *sdata,
1569 struct ieee802_11_elems *elems,
1570 enum ieee80211_band band, u32 *basic_rates)
1571 {
1572 struct ieee80211_supported_band *sband;
1573 size_t num_rates;
1574 u32 supp_rates, rate_flags;
1575 int i, j, shift;
1576 sband = sdata->local->hw.wiphy->bands[band];
1577
1578 rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
1579 shift = ieee80211_vif_get_shift(&sdata->vif);
1580
1581 if (WARN_ON(!sband))
1582 return 1;
1583
1584 num_rates = sband->n_bitrates;
1585 supp_rates = 0;
1586 for (i = 0; i < elems->supp_rates_len +
1587 elems->ext_supp_rates_len; i++) {
1588 u8 rate = 0;
1589 int own_rate;
1590 bool is_basic;
1591 if (i < elems->supp_rates_len)
1592 rate = elems->supp_rates[i];
1593 else if (elems->ext_supp_rates)
1594 rate = elems->ext_supp_rates
1595 [i - elems->supp_rates_len];
1596 own_rate = 5 * (rate & 0x7f);
1597 is_basic = !!(rate & 0x80);
1598
1599 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1600 continue;
1601
1602 for (j = 0; j < num_rates; j++) {
1603 int brate;
1604 if ((rate_flags & sband->bitrates[j].flags)
1605 != rate_flags)
1606 continue;
1607
1608 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
1609 1 << shift);
1610
1611 if (brate == own_rate) {
1612 supp_rates |= BIT(j);
1613 if (basic_rates && is_basic)
1614 *basic_rates |= BIT(j);
1615 }
1616 }
1617 }
1618 return supp_rates;
1619 }
1620
1621 void ieee80211_stop_device(struct ieee80211_local *local)
1622 {
1623 ieee80211_led_radio(local, false);
1624 ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1625
1626 cancel_work_sync(&local->reconfig_filter);
1627
1628 flush_workqueue(local->workqueue);
1629 drv_stop(local);
1630 }
1631
1632 static void ieee80211_handle_reconfig_failure(struct ieee80211_local *local)
1633 {
1634 struct ieee80211_sub_if_data *sdata;
1635 struct ieee80211_chanctx *ctx;
1636
1637 /*
1638 * We get here if during resume the device can't be restarted properly.
1639 * We might also get here if this happens during HW reset, which is a
1640 * slightly different situation and we need to drop all connections in
1641 * the latter case.
1642 *
1643 * Ask cfg80211 to turn off all interfaces, this will result in more
1644 * warnings but at least we'll then get into a clean stopped state.
1645 */
1646
1647 local->resuming = false;
1648 local->suspended = false;
1649 local->started = false;
1650
1651 /* scheduled scan clearly can't be running any more, but tell
1652 * cfg80211 and clear local state
1653 */
1654 ieee80211_sched_scan_end(local);
1655
1656 list_for_each_entry(sdata, &local->interfaces, list)
1657 sdata->flags &= ~IEEE80211_SDATA_IN_DRIVER;
1658
1659 /* Mark channel contexts as not being in the driver any more to avoid
1660 * removing them from the driver during the shutdown process...
1661 */
1662 mutex_lock(&local->chanctx_mtx);
1663 list_for_each_entry(ctx, &local->chanctx_list, list)
1664 ctx->driver_present = false;
1665 mutex_unlock(&local->chanctx_mtx);
1666
1667 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1668 }
1669
1670 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1671 struct ieee80211_sub_if_data *sdata)
1672 {
1673 struct ieee80211_chanctx_conf *conf;
1674 struct ieee80211_chanctx *ctx;
1675
1676 if (!local->use_chanctx)
1677 return;
1678
1679 mutex_lock(&local->chanctx_mtx);
1680 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1681 lockdep_is_held(&local->chanctx_mtx));
1682 if (conf) {
1683 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1684 drv_assign_vif_chanctx(local, sdata, ctx);
1685 }
1686 mutex_unlock(&local->chanctx_mtx);
1687 }
1688
1689 int ieee80211_reconfig(struct ieee80211_local *local)
1690 {
1691 struct ieee80211_hw *hw = &local->hw;
1692 struct ieee80211_sub_if_data *sdata;
1693 struct ieee80211_chanctx *ctx;
1694 struct sta_info *sta;
1695 int res, i;
1696 bool reconfig_due_to_wowlan = false;
1697 struct ieee80211_sub_if_data *sched_scan_sdata;
1698 bool sched_scan_stopped = false;
1699
1700 #ifdef CONFIG_PM
1701 if (local->suspended)
1702 local->resuming = true;
1703
1704 if (local->wowlan) {
1705 res = drv_resume(local);
1706 local->wowlan = false;
1707 if (res < 0) {
1708 local->resuming = false;
1709 return res;
1710 }
1711 if (res == 0)
1712 goto wake_up;
1713 WARN_ON(res > 1);
1714 /*
1715 * res is 1, which means the driver requested
1716 * to go through a regular reset on wakeup.
1717 */
1718 reconfig_due_to_wowlan = true;
1719 }
1720 #endif
1721 /* everything else happens only if HW was up & running */
1722 if (!local->open_count)
1723 goto wake_up;
1724
1725 /*
1726 * Upon resume hardware can sometimes be goofy due to
1727 * various platform / driver / bus issues, so restarting
1728 * the device may at times not work immediately. Propagate
1729 * the error.
1730 */
1731 res = drv_start(local);
1732 if (res) {
1733 if (local->suspended)
1734 WARN(1, "Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue.\n");
1735 else
1736 WARN(1, "Hardware became unavailable during restart.\n");
1737 ieee80211_handle_reconfig_failure(local);
1738 return res;
1739 }
1740
1741 /* setup fragmentation threshold */
1742 drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1743
1744 /* setup RTS threshold */
1745 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1746
1747 /* reset coverage class */
1748 drv_set_coverage_class(local, hw->wiphy->coverage_class);
1749
1750 ieee80211_led_radio(local, true);
1751 ieee80211_mod_tpt_led_trig(local,
1752 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1753
1754 /* add interfaces */
1755 sdata = rtnl_dereference(local->monitor_sdata);
1756 if (sdata) {
1757 /* in HW restart it exists already */
1758 WARN_ON(local->resuming);
1759 res = drv_add_interface(local, sdata);
1760 if (WARN_ON(res)) {
1761 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1762 synchronize_net();
1763 kfree(sdata);
1764 }
1765 }
1766
1767 list_for_each_entry(sdata, &local->interfaces, list) {
1768 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1769 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1770 ieee80211_sdata_running(sdata))
1771 res = drv_add_interface(local, sdata);
1772 }
1773
1774 /* add channel contexts */
1775 if (local->use_chanctx) {
1776 mutex_lock(&local->chanctx_mtx);
1777 list_for_each_entry(ctx, &local->chanctx_list, list)
1778 if (ctx->replace_state !=
1779 IEEE80211_CHANCTX_REPLACES_OTHER)
1780 WARN_ON(drv_add_chanctx(local, ctx));
1781 mutex_unlock(&local->chanctx_mtx);
1782
1783 list_for_each_entry(sdata, &local->interfaces, list) {
1784 if (!ieee80211_sdata_running(sdata))
1785 continue;
1786 ieee80211_assign_chanctx(local, sdata);
1787 }
1788
1789 sdata = rtnl_dereference(local->monitor_sdata);
1790 if (sdata && ieee80211_sdata_running(sdata))
1791 ieee80211_assign_chanctx(local, sdata);
1792 }
1793
1794 /* add STAs back */
1795 mutex_lock(&local->sta_mtx);
1796 list_for_each_entry(sta, &local->sta_list, list) {
1797 enum ieee80211_sta_state state;
1798
1799 if (!sta->uploaded)
1800 continue;
1801
1802 /* AP-mode stations will be added later */
1803 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1804 continue;
1805
1806 for (state = IEEE80211_STA_NOTEXIST;
1807 state < sta->sta_state; state++)
1808 WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1809 state + 1));
1810 }
1811 mutex_unlock(&local->sta_mtx);
1812
1813 /* reconfigure tx conf */
1814 if (hw->queues >= IEEE80211_NUM_ACS) {
1815 list_for_each_entry(sdata, &local->interfaces, list) {
1816 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1817 sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1818 !ieee80211_sdata_running(sdata))
1819 continue;
1820
1821 for (i = 0; i < IEEE80211_NUM_ACS; i++)
1822 drv_conf_tx(local, sdata, i,
1823 &sdata->tx_conf[i]);
1824 }
1825 }
1826
1827 /* reconfigure hardware */
1828 ieee80211_hw_config(local, ~0);
1829
1830 ieee80211_configure_filter(local);
1831
1832 /* Finally also reconfigure all the BSS information */
1833 list_for_each_entry(sdata, &local->interfaces, list) {
1834 u32 changed;
1835
1836 if (!ieee80211_sdata_running(sdata))
1837 continue;
1838
1839 /* common change flags for all interface types */
1840 changed = BSS_CHANGED_ERP_CTS_PROT |
1841 BSS_CHANGED_ERP_PREAMBLE |
1842 BSS_CHANGED_ERP_SLOT |
1843 BSS_CHANGED_HT |
1844 BSS_CHANGED_BASIC_RATES |
1845 BSS_CHANGED_BEACON_INT |
1846 BSS_CHANGED_BSSID |
1847 BSS_CHANGED_CQM |
1848 BSS_CHANGED_QOS |
1849 BSS_CHANGED_IDLE |
1850 BSS_CHANGED_TXPOWER;
1851
1852 switch (sdata->vif.type) {
1853 case NL80211_IFTYPE_STATION:
1854 changed |= BSS_CHANGED_ASSOC |
1855 BSS_CHANGED_ARP_FILTER |
1856 BSS_CHANGED_PS;
1857
1858 /* Re-send beacon info report to the driver */
1859 if (sdata->u.mgd.have_beacon)
1860 changed |= BSS_CHANGED_BEACON_INFO;
1861
1862 sdata_lock(sdata);
1863 ieee80211_bss_info_change_notify(sdata, changed);
1864 sdata_unlock(sdata);
1865 break;
1866 case NL80211_IFTYPE_OCB:
1867 changed |= BSS_CHANGED_OCB;
1868 ieee80211_bss_info_change_notify(sdata, changed);
1869 break;
1870 case NL80211_IFTYPE_ADHOC:
1871 changed |= BSS_CHANGED_IBSS;
1872 /* fall through */
1873 case NL80211_IFTYPE_AP:
1874 changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1875
1876 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1877 changed |= BSS_CHANGED_AP_PROBE_RESP;
1878
1879 if (rcu_access_pointer(sdata->u.ap.beacon))
1880 drv_start_ap(local, sdata);
1881 }
1882
1883 /* fall through */
1884 case NL80211_IFTYPE_MESH_POINT:
1885 if (sdata->vif.bss_conf.enable_beacon) {
1886 changed |= BSS_CHANGED_BEACON |
1887 BSS_CHANGED_BEACON_ENABLED;
1888 ieee80211_bss_info_change_notify(sdata, changed);
1889 }
1890 break;
1891 case NL80211_IFTYPE_WDS:
1892 case NL80211_IFTYPE_AP_VLAN:
1893 case NL80211_IFTYPE_MONITOR:
1894 case NL80211_IFTYPE_P2P_DEVICE:
1895 /* nothing to do */
1896 break;
1897 case NL80211_IFTYPE_UNSPECIFIED:
1898 case NUM_NL80211_IFTYPES:
1899 case NL80211_IFTYPE_P2P_CLIENT:
1900 case NL80211_IFTYPE_P2P_GO:
1901 WARN_ON(1);
1902 break;
1903 }
1904 }
1905
1906 ieee80211_recalc_ps(local, -1);
1907
1908 /*
1909 * The sta might be in psm against the ap (e.g. because
1910 * this was the state before a hw restart), so we
1911 * explicitly send a null packet in order to make sure
1912 * it'll sync against the ap (and get out of psm).
1913 */
1914 if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1915 list_for_each_entry(sdata, &local->interfaces, list) {
1916 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1917 continue;
1918 if (!sdata->u.mgd.associated)
1919 continue;
1920
1921 ieee80211_send_nullfunc(local, sdata, 0);
1922 }
1923 }
1924
1925 /* APs are now beaconing, add back stations */
1926 mutex_lock(&local->sta_mtx);
1927 list_for_each_entry(sta, &local->sta_list, list) {
1928 enum ieee80211_sta_state state;
1929
1930 if (!sta->uploaded)
1931 continue;
1932
1933 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1934 continue;
1935
1936 for (state = IEEE80211_STA_NOTEXIST;
1937 state < sta->sta_state; state++)
1938 WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1939 state + 1));
1940 }
1941 mutex_unlock(&local->sta_mtx);
1942
1943 /* add back keys */
1944 list_for_each_entry(sdata, &local->interfaces, list)
1945 if (ieee80211_sdata_running(sdata))
1946 ieee80211_enable_keys(sdata);
1947
1948 wake_up:
1949 local->in_reconfig = false;
1950 barrier();
1951
1952 if (local->monitors == local->open_count && local->monitors > 0)
1953 ieee80211_add_virtual_monitor(local);
1954
1955 /*
1956 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1957 * sessions can be established after a resume.
1958 *
1959 * Also tear down aggregation sessions since reconfiguring
1960 * them in a hardware restart scenario is not easily done
1961 * right now, and the hardware will have lost information
1962 * about the sessions, but we and the AP still think they
1963 * are active. This is really a workaround though.
1964 */
1965 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1966 mutex_lock(&local->sta_mtx);
1967
1968 list_for_each_entry(sta, &local->sta_list, list) {
1969 ieee80211_sta_tear_down_BA_sessions(
1970 sta, AGG_STOP_LOCAL_REQUEST);
1971 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1972 }
1973
1974 mutex_unlock(&local->sta_mtx);
1975 }
1976
1977 ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
1978 IEEE80211_QUEUE_STOP_REASON_SUSPEND,
1979 false);
1980
1981 /*
1982 * Reconfigure sched scan if it was interrupted by FW restart or
1983 * suspend.
1984 */
1985 mutex_lock(&local->mtx);
1986 sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1987 lockdep_is_held(&local->mtx));
1988 if (sched_scan_sdata && local->sched_scan_req)
1989 /*
1990 * Sched scan stopped, but we don't want to report it. Instead,
1991 * we're trying to reschedule.
1992 */
1993 if (__ieee80211_request_sched_scan_start(sched_scan_sdata,
1994 local->sched_scan_req))
1995 sched_scan_stopped = true;
1996 mutex_unlock(&local->mtx);
1997
1998 if (sched_scan_stopped)
1999 cfg80211_sched_scan_stopped_rtnl(local->hw.wiphy);
2000
2001 /*
2002 * If this is for hw restart things are still running.
2003 * We may want to change that later, however.
2004 */
2005 if (!local->suspended || reconfig_due_to_wowlan)
2006 drv_reconfig_complete(local, IEEE80211_RECONFIG_TYPE_RESTART);
2007
2008 if (!local->suspended)
2009 return 0;
2010
2011 #ifdef CONFIG_PM
2012 /* first set suspended false, then resuming */
2013 local->suspended = false;
2014 mb();
2015 local->resuming = false;
2016
2017 if (!reconfig_due_to_wowlan)
2018 drv_reconfig_complete(local, IEEE80211_RECONFIG_TYPE_SUSPEND);
2019
2020 list_for_each_entry(sdata, &local->interfaces, list) {
2021 if (!ieee80211_sdata_running(sdata))
2022 continue;
2023 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2024 ieee80211_sta_restart(sdata);
2025 }
2026
2027 mod_timer(&local->sta_cleanup, jiffies + 1);
2028 #else
2029 WARN_ON(1);
2030 #endif
2031
2032 return 0;
2033 }
2034
2035 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
2036 {
2037 struct ieee80211_sub_if_data *sdata;
2038 struct ieee80211_local *local;
2039 struct ieee80211_key *key;
2040
2041 if (WARN_ON(!vif))
2042 return;
2043
2044 sdata = vif_to_sdata(vif);
2045 local = sdata->local;
2046
2047 if (WARN_ON(!local->resuming))
2048 return;
2049
2050 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2051 return;
2052
2053 sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
2054
2055 mutex_lock(&local->key_mtx);
2056 list_for_each_entry(key, &sdata->key_list, list)
2057 key->flags |= KEY_FLAG_TAINTED;
2058 mutex_unlock(&local->key_mtx);
2059 }
2060 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
2061
2062 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
2063 {
2064 struct ieee80211_local *local = sdata->local;
2065 struct ieee80211_chanctx_conf *chanctx_conf;
2066 struct ieee80211_chanctx *chanctx;
2067
2068 mutex_lock(&local->chanctx_mtx);
2069
2070 chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2071 lockdep_is_held(&local->chanctx_mtx));
2072
2073 if (WARN_ON_ONCE(!chanctx_conf))
2074 goto unlock;
2075
2076 chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2077 ieee80211_recalc_smps_chanctx(local, chanctx);
2078 unlock:
2079 mutex_unlock(&local->chanctx_mtx);
2080 }
2081
2082 void ieee80211_recalc_min_chandef(struct ieee80211_sub_if_data *sdata)
2083 {
2084 struct ieee80211_local *local = sdata->local;
2085 struct ieee80211_chanctx_conf *chanctx_conf;
2086 struct ieee80211_chanctx *chanctx;
2087
2088 mutex_lock(&local->chanctx_mtx);
2089
2090 chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2091 lockdep_is_held(&local->chanctx_mtx));
2092
2093 if (WARN_ON_ONCE(!chanctx_conf))
2094 goto unlock;
2095
2096 chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2097 ieee80211_recalc_chanctx_min_def(local, chanctx);
2098 unlock:
2099 mutex_unlock(&local->chanctx_mtx);
2100 }
2101
2102 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
2103 {
2104 int i;
2105
2106 for (i = 0; i < n_ids; i++)
2107 if (ids[i] == id)
2108 return true;
2109 return false;
2110 }
2111
2112 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
2113 const u8 *ids, int n_ids,
2114 const u8 *after_ric, int n_after_ric,
2115 size_t offset)
2116 {
2117 size_t pos = offset;
2118
2119 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos])) {
2120 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
2121 pos += 2 + ies[pos + 1];
2122
2123 while (pos < ielen &&
2124 !ieee80211_id_in_list(after_ric, n_after_ric,
2125 ies[pos]))
2126 pos += 2 + ies[pos + 1];
2127 } else {
2128 pos += 2 + ies[pos + 1];
2129 }
2130 }
2131
2132 return pos;
2133 }
2134
2135 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
2136 const u8 *ids, int n_ids, size_t offset)
2137 {
2138 return ieee80211_ie_split_ric(ies, ielen, ids, n_ids, NULL, 0, offset);
2139 }
2140 EXPORT_SYMBOL(ieee80211_ie_split);
2141
2142 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
2143 {
2144 size_t pos = offset;
2145
2146 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
2147 pos += 2 + ies[pos + 1];
2148
2149 return pos;
2150 }
2151
2152 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
2153 int rssi_min_thold,
2154 int rssi_max_thold)
2155 {
2156 trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
2157
2158 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2159 return;
2160
2161 /*
2162 * Scale up threshold values before storing it, as the RSSI averaging
2163 * algorithm uses a scaled up value as well. Change this scaling
2164 * factor if the RSSI averaging algorithm changes.
2165 */
2166 sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
2167 sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
2168 }
2169
2170 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
2171 int rssi_min_thold,
2172 int rssi_max_thold)
2173 {
2174 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2175
2176 WARN_ON(rssi_min_thold == rssi_max_thold ||
2177 rssi_min_thold > rssi_max_thold);
2178
2179 _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
2180 rssi_max_thold);
2181 }
2182 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
2183
2184 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
2185 {
2186 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2187
2188 _ieee80211_enable_rssi_reports(sdata, 0, 0);
2189 }
2190 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
2191
2192 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2193 u16 cap)
2194 {
2195 __le16 tmp;
2196
2197 *pos++ = WLAN_EID_HT_CAPABILITY;
2198 *pos++ = sizeof(struct ieee80211_ht_cap);
2199 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
2200
2201 /* capability flags */
2202 tmp = cpu_to_le16(cap);
2203 memcpy(pos, &tmp, sizeof(u16));
2204 pos += sizeof(u16);
2205
2206 /* AMPDU parameters */
2207 *pos++ = ht_cap->ampdu_factor |
2208 (ht_cap->ampdu_density <<
2209 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
2210
2211 /* MCS set */
2212 memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
2213 pos += sizeof(ht_cap->mcs);
2214
2215 /* extended capabilities */
2216 pos += sizeof(__le16);
2217
2218 /* BF capabilities */
2219 pos += sizeof(__le32);
2220
2221 /* antenna selection */
2222 pos += sizeof(u8);
2223
2224 return pos;
2225 }
2226
2227 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2228 u32 cap)
2229 {
2230 __le32 tmp;
2231
2232 *pos++ = WLAN_EID_VHT_CAPABILITY;
2233 *pos++ = sizeof(struct ieee80211_vht_cap);
2234 memset(pos, 0, sizeof(struct ieee80211_vht_cap));
2235
2236 /* capability flags */
2237 tmp = cpu_to_le32(cap);
2238 memcpy(pos, &tmp, sizeof(u32));
2239 pos += sizeof(u32);
2240
2241 /* VHT MCS set */
2242 memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
2243 pos += sizeof(vht_cap->vht_mcs);
2244
2245 return pos;
2246 }
2247
2248 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2249 const struct cfg80211_chan_def *chandef,
2250 u16 prot_mode)
2251 {
2252 struct ieee80211_ht_operation *ht_oper;
2253 /* Build HT Information */
2254 *pos++ = WLAN_EID_HT_OPERATION;
2255 *pos++ = sizeof(struct ieee80211_ht_operation);
2256 ht_oper = (struct ieee80211_ht_operation *)pos;
2257 ht_oper->primary_chan = ieee80211_frequency_to_channel(
2258 chandef->chan->center_freq);
2259 switch (chandef->width) {
2260 case NL80211_CHAN_WIDTH_160:
2261 case NL80211_CHAN_WIDTH_80P80:
2262 case NL80211_CHAN_WIDTH_80:
2263 case NL80211_CHAN_WIDTH_40:
2264 if (chandef->center_freq1 > chandef->chan->center_freq)
2265 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2266 else
2267 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2268 break;
2269 default:
2270 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
2271 break;
2272 }
2273 if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
2274 chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
2275 chandef->width != NL80211_CHAN_WIDTH_20)
2276 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
2277
2278 ht_oper->operation_mode = cpu_to_le16(prot_mode);
2279 ht_oper->stbc_param = 0x0000;
2280
2281 /* It seems that Basic MCS set and Supported MCS set
2282 are identical for the first 10 bytes */
2283 memset(&ht_oper->basic_set, 0, 16);
2284 memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
2285
2286 return pos + sizeof(struct ieee80211_ht_operation);
2287 }
2288
2289 void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan,
2290 const struct ieee80211_ht_operation *ht_oper,
2291 struct cfg80211_chan_def *chandef)
2292 {
2293 enum nl80211_channel_type channel_type;
2294
2295 if (!ht_oper) {
2296 cfg80211_chandef_create(chandef, control_chan,
2297 NL80211_CHAN_NO_HT);
2298 return;
2299 }
2300
2301 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
2302 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
2303 channel_type = NL80211_CHAN_HT20;
2304 break;
2305 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
2306 channel_type = NL80211_CHAN_HT40PLUS;
2307 break;
2308 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
2309 channel_type = NL80211_CHAN_HT40MINUS;
2310 break;
2311 default:
2312 channel_type = NL80211_CHAN_NO_HT;
2313 }
2314
2315 cfg80211_chandef_create(chandef, control_chan, channel_type);
2316 }
2317
2318 int ieee80211_parse_bitrates(struct cfg80211_chan_def *chandef,
2319 const struct ieee80211_supported_band *sband,
2320 const u8 *srates, int srates_len, u32 *rates)
2321 {
2322 u32 rate_flags = ieee80211_chandef_rate_flags(chandef);
2323 int shift = ieee80211_chandef_get_shift(chandef);
2324 struct ieee80211_rate *br;
2325 int brate, rate, i, j, count = 0;
2326
2327 *rates = 0;
2328
2329 for (i = 0; i < srates_len; i++) {
2330 rate = srates[i] & 0x7f;
2331
2332 for (j = 0; j < sband->n_bitrates; j++) {
2333 br = &sband->bitrates[j];
2334 if ((rate_flags & br->flags) != rate_flags)
2335 continue;
2336
2337 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2338 if (brate == rate) {
2339 *rates |= BIT(j);
2340 count++;
2341 break;
2342 }
2343 }
2344 }
2345 return count;
2346 }
2347
2348 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
2349 struct sk_buff *skb, bool need_basic,
2350 enum ieee80211_band band)
2351 {
2352 struct ieee80211_local *local = sdata->local;
2353 struct ieee80211_supported_band *sband;
2354 int rate, shift;
2355 u8 i, rates, *pos;
2356 u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2357 u32 rate_flags;
2358
2359 shift = ieee80211_vif_get_shift(&sdata->vif);
2360 rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2361 sband = local->hw.wiphy->bands[band];
2362 rates = 0;
2363 for (i = 0; i < sband->n_bitrates; i++) {
2364 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2365 continue;
2366 rates++;
2367 }
2368 if (rates > 8)
2369 rates = 8;
2370
2371 if (skb_tailroom(skb) < rates + 2)
2372 return -ENOMEM;
2373
2374 pos = skb_put(skb, rates + 2);
2375 *pos++ = WLAN_EID_SUPP_RATES;
2376 *pos++ = rates;
2377 for (i = 0; i < rates; i++) {
2378 u8 basic = 0;
2379 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2380 continue;
2381
2382 if (need_basic && basic_rates & BIT(i))
2383 basic = 0x80;
2384 rate = sband->bitrates[i].bitrate;
2385 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2386 5 * (1 << shift));
2387 *pos++ = basic | (u8) rate;
2388 }
2389
2390 return 0;
2391 }
2392
2393 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2394 struct sk_buff *skb, bool need_basic,
2395 enum ieee80211_band band)
2396 {
2397 struct ieee80211_local *local = sdata->local;
2398 struct ieee80211_supported_band *sband;
2399 int rate, shift;
2400 u8 i, exrates, *pos;
2401 u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2402 u32 rate_flags;
2403
2404 rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2405 shift = ieee80211_vif_get_shift(&sdata->vif);
2406
2407 sband = local->hw.wiphy->bands[band];
2408 exrates = 0;
2409 for (i = 0; i < sband->n_bitrates; i++) {
2410 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2411 continue;
2412 exrates++;
2413 }
2414
2415 if (exrates > 8)
2416 exrates -= 8;
2417 else
2418 exrates = 0;
2419
2420 if (skb_tailroom(skb) < exrates + 2)
2421 return -ENOMEM;
2422
2423 if (exrates) {
2424 pos = skb_put(skb, exrates + 2);
2425 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2426 *pos++ = exrates;
2427 for (i = 8; i < sband->n_bitrates; i++) {
2428 u8 basic = 0;
2429 if ((rate_flags & sband->bitrates[i].flags)
2430 != rate_flags)
2431 continue;
2432 if (need_basic && basic_rates & BIT(i))
2433 basic = 0x80;
2434 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2435 5 * (1 << shift));
2436 *pos++ = basic | (u8) rate;
2437 }
2438 }
2439 return 0;
2440 }
2441
2442 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2443 {
2444 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2445 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2446
2447 if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2448 /* non-managed type inferfaces */
2449 return 0;
2450 }
2451 return ifmgd->ave_beacon_signal / 16;
2452 }
2453 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2454
2455 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2456 {
2457 if (!mcs)
2458 return 1;
2459
2460 /* TODO: consider rx_highest */
2461
2462 if (mcs->rx_mask[3])
2463 return 4;
2464 if (mcs->rx_mask[2])
2465 return 3;
2466 if (mcs->rx_mask[1])
2467 return 2;
2468 return 1;
2469 }
2470
2471 /**
2472 * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2473 * @local: mac80211 hw info struct
2474 * @status: RX status
2475 * @mpdu_len: total MPDU length (including FCS)
2476 * @mpdu_offset: offset into MPDU to calculate timestamp at
2477 *
2478 * This function calculates the RX timestamp at the given MPDU offset, taking
2479 * into account what the RX timestamp was. An offset of 0 will just normalize
2480 * the timestamp to TSF at beginning of MPDU reception.
2481 */
2482 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2483 struct ieee80211_rx_status *status,
2484 unsigned int mpdu_len,
2485 unsigned int mpdu_offset)
2486 {
2487 u64 ts = status->mactime;
2488 struct rate_info ri;
2489 u16 rate;
2490
2491 if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2492 return 0;
2493
2494 memset(&ri, 0, sizeof(ri));
2495
2496 /* Fill cfg80211 rate info */
2497 if (status->flag & RX_FLAG_HT) {
2498 ri.mcs = status->rate_idx;
2499 ri.flags |= RATE_INFO_FLAGS_MCS;
2500 if (status->flag & RX_FLAG_40MHZ)
2501 ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2502 if (status->flag & RX_FLAG_SHORT_GI)
2503 ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2504 } else if (status->flag & RX_FLAG_VHT) {
2505 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2506 ri.mcs = status->rate_idx;
2507 ri.nss = status->vht_nss;
2508 if (status->flag & RX_FLAG_40MHZ)
2509 ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2510 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
2511 ri.flags |= RATE_INFO_FLAGS_80_MHZ_WIDTH;
2512 if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
2513 ri.flags |= RATE_INFO_FLAGS_80P80_MHZ_WIDTH;
2514 if (status->vht_flag & RX_VHT_FLAG_160MHZ)
2515 ri.flags |= RATE_INFO_FLAGS_160_MHZ_WIDTH;
2516 if (status->flag & RX_FLAG_SHORT_GI)
2517 ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2518 } else {
2519 struct ieee80211_supported_band *sband;
2520 int shift = 0;
2521 int bitrate;
2522
2523 if (status->flag & RX_FLAG_10MHZ)
2524 shift = 1;
2525 if (status->flag & RX_FLAG_5MHZ)
2526 shift = 2;
2527
2528 sband = local->hw.wiphy->bands[status->band];
2529 bitrate = sband->bitrates[status->rate_idx].bitrate;
2530 ri.legacy = DIV_ROUND_UP(bitrate, (1 << shift));
2531 }
2532
2533 rate = cfg80211_calculate_bitrate(&ri);
2534 if (WARN_ONCE(!rate,
2535 "Invalid bitrate: flags=0x%x, idx=%d, vht_nss=%d\n",
2536 status->flag, status->rate_idx, status->vht_nss))
2537 return 0;
2538
2539 /* rewind from end of MPDU */
2540 if (status->flag & RX_FLAG_MACTIME_END)
2541 ts -= mpdu_len * 8 * 10 / rate;
2542
2543 ts += mpdu_offset * 8 * 10 / rate;
2544
2545 return ts;
2546 }
2547
2548 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2549 {
2550 struct ieee80211_sub_if_data *sdata;
2551 struct cfg80211_chan_def chandef;
2552
2553 mutex_lock(&local->mtx);
2554 mutex_lock(&local->iflist_mtx);
2555 list_for_each_entry(sdata, &local->interfaces, list) {
2556 /* it might be waiting for the local->mtx, but then
2557 * by the time it gets it, sdata->wdev.cac_started
2558 * will no longer be true
2559 */
2560 cancel_delayed_work(&sdata->dfs_cac_timer_work);
2561
2562 if (sdata->wdev.cac_started) {
2563 chandef = sdata->vif.bss_conf.chandef;
2564 ieee80211_vif_release_channel(sdata);
2565 cfg80211_cac_event(sdata->dev,
2566 &chandef,
2567 NL80211_RADAR_CAC_ABORTED,
2568 GFP_KERNEL);
2569 }
2570 }
2571 mutex_unlock(&local->iflist_mtx);
2572 mutex_unlock(&local->mtx);
2573 }
2574
2575 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2576 {
2577 struct ieee80211_local *local =
2578 container_of(work, struct ieee80211_local, radar_detected_work);
2579 struct cfg80211_chan_def chandef = local->hw.conf.chandef;
2580 struct ieee80211_chanctx *ctx;
2581 int num_chanctx = 0;
2582
2583 mutex_lock(&local->chanctx_mtx);
2584 list_for_each_entry(ctx, &local->chanctx_list, list) {
2585 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER)
2586 continue;
2587
2588 num_chanctx++;
2589 chandef = ctx->conf.def;
2590 }
2591 mutex_unlock(&local->chanctx_mtx);
2592
2593 ieee80211_dfs_cac_cancel(local);
2594
2595 if (num_chanctx > 1)
2596 /* XXX: multi-channel is not supported yet */
2597 WARN_ON(1);
2598 else
2599 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
2600 }
2601
2602 void ieee80211_radar_detected(struct ieee80211_hw *hw)
2603 {
2604 struct ieee80211_local *local = hw_to_local(hw);
2605
2606 trace_api_radar_detected(local);
2607
2608 ieee80211_queue_work(hw, &local->radar_detected_work);
2609 }
2610 EXPORT_SYMBOL(ieee80211_radar_detected);
2611
2612 u32 ieee80211_chandef_downgrade(struct cfg80211_chan_def *c)
2613 {
2614 u32 ret;
2615 int tmp;
2616
2617 switch (c->width) {
2618 case NL80211_CHAN_WIDTH_20:
2619 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2620 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2621 break;
2622 case NL80211_CHAN_WIDTH_40:
2623 c->width = NL80211_CHAN_WIDTH_20;
2624 c->center_freq1 = c->chan->center_freq;
2625 ret = IEEE80211_STA_DISABLE_40MHZ |
2626 IEEE80211_STA_DISABLE_VHT;
2627 break;
2628 case NL80211_CHAN_WIDTH_80:
2629 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
2630 /* n_P40 */
2631 tmp /= 2;
2632 /* freq_P40 */
2633 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
2634 c->width = NL80211_CHAN_WIDTH_40;
2635 ret = IEEE80211_STA_DISABLE_VHT;
2636 break;
2637 case NL80211_CHAN_WIDTH_80P80:
2638 c->center_freq2 = 0;
2639 c->width = NL80211_CHAN_WIDTH_80;
2640 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2641 IEEE80211_STA_DISABLE_160MHZ;
2642 break;
2643 case NL80211_CHAN_WIDTH_160:
2644 /* n_P20 */
2645 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
2646 /* n_P80 */
2647 tmp /= 4;
2648 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
2649 c->width = NL80211_CHAN_WIDTH_80;
2650 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2651 IEEE80211_STA_DISABLE_160MHZ;
2652 break;
2653 default:
2654 case NL80211_CHAN_WIDTH_20_NOHT:
2655 WARN_ON_ONCE(1);
2656 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2657 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2658 break;
2659 case NL80211_CHAN_WIDTH_5:
2660 case NL80211_CHAN_WIDTH_10:
2661 WARN_ON_ONCE(1);
2662 /* keep c->width */
2663 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2664 break;
2665 }
2666
2667 WARN_ON_ONCE(!cfg80211_chandef_valid(c));
2668
2669 return ret;
2670 }
2671
2672 /*
2673 * Returns true if smps_mode_new is strictly more restrictive than
2674 * smps_mode_old.
2675 */
2676 bool ieee80211_smps_is_restrictive(enum ieee80211_smps_mode smps_mode_old,
2677 enum ieee80211_smps_mode smps_mode_new)
2678 {
2679 if (WARN_ON_ONCE(smps_mode_old == IEEE80211_SMPS_AUTOMATIC ||
2680 smps_mode_new == IEEE80211_SMPS_AUTOMATIC))
2681 return false;
2682
2683 switch (smps_mode_old) {
2684 case IEEE80211_SMPS_STATIC:
2685 return false;
2686 case IEEE80211_SMPS_DYNAMIC:
2687 return smps_mode_new == IEEE80211_SMPS_STATIC;
2688 case IEEE80211_SMPS_OFF:
2689 return smps_mode_new != IEEE80211_SMPS_OFF;
2690 default:
2691 WARN_ON(1);
2692 }
2693
2694 return false;
2695 }
2696
2697 int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
2698 struct cfg80211_csa_settings *csa_settings)
2699 {
2700 struct sk_buff *skb;
2701 struct ieee80211_mgmt *mgmt;
2702 struct ieee80211_local *local = sdata->local;
2703 int freq;
2704 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.chan_switch) +
2705 sizeof(mgmt->u.action.u.chan_switch);
2706 u8 *pos;
2707
2708 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2709 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2710 return -EOPNOTSUPP;
2711
2712 skb = dev_alloc_skb(local->tx_headroom + hdr_len +
2713 5 + /* channel switch announcement element */
2714 3 + /* secondary channel offset element */
2715 8); /* mesh channel switch parameters element */
2716 if (!skb)
2717 return -ENOMEM;
2718
2719 skb_reserve(skb, local->tx_headroom);
2720 mgmt = (struct ieee80211_mgmt *)skb_put(skb, hdr_len);
2721 memset(mgmt, 0, hdr_len);
2722 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2723 IEEE80211_STYPE_ACTION);
2724
2725 eth_broadcast_addr(mgmt->da);
2726 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2727 if (ieee80211_vif_is_mesh(&sdata->vif)) {
2728 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2729 } else {
2730 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2731 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
2732 }
2733 mgmt->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
2734 mgmt->u.action.u.chan_switch.action_code = WLAN_ACTION_SPCT_CHL_SWITCH;
2735 pos = skb_put(skb, 5);
2736 *pos++ = WLAN_EID_CHANNEL_SWITCH; /* EID */
2737 *pos++ = 3; /* IE length */
2738 *pos++ = csa_settings->block_tx ? 1 : 0; /* CSA mode */
2739 freq = csa_settings->chandef.chan->center_freq;
2740 *pos++ = ieee80211_frequency_to_channel(freq); /* channel */
2741 *pos++ = csa_settings->count; /* count */
2742
2743 if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_40) {
2744 enum nl80211_channel_type ch_type;
2745
2746 skb_put(skb, 3);
2747 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
2748 *pos++ = 1; /* IE length */
2749 ch_type = cfg80211_get_chandef_type(&csa_settings->chandef);
2750 if (ch_type == NL80211_CHAN_HT40PLUS)
2751 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2752 else
2753 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2754 }
2755
2756 if (ieee80211_vif_is_mesh(&sdata->vif)) {
2757 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2758
2759 skb_put(skb, 8);
2760 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM; /* EID */
2761 *pos++ = 6; /* IE length */
2762 *pos++ = sdata->u.mesh.mshcfg.dot11MeshTTL; /* Mesh TTL */
2763 *pos = 0x00; /* Mesh Flag: Tx Restrict, Initiator, Reason */
2764 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
2765 *pos++ |= csa_settings->block_tx ?
2766 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
2767 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); /* Reason Cd */
2768 pos += 2;
2769 put_unaligned_le16(ifmsh->pre_value, pos);/* Precedence Value */
2770 pos += 2;
2771 }
2772
2773 ieee80211_tx_skb(sdata, skb);
2774 return 0;
2775 }
2776
2777 bool ieee80211_cs_valid(const struct ieee80211_cipher_scheme *cs)
2778 {
2779 return !(cs == NULL || cs->cipher == 0 ||
2780 cs->hdr_len < cs->pn_len + cs->pn_off ||
2781 cs->hdr_len <= cs->key_idx_off ||
2782 cs->key_idx_shift > 7 ||
2783 cs->key_idx_mask == 0);
2784 }
2785
2786 bool ieee80211_cs_list_valid(const struct ieee80211_cipher_scheme *cs, int n)
2787 {
2788 int i;
2789
2790 /* Ensure we have enough iftype bitmap space for all iftype values */
2791 WARN_ON((NUM_NL80211_IFTYPES / 8 + 1) > sizeof(cs[0].iftype));
2792
2793 for (i = 0; i < n; i++)
2794 if (!ieee80211_cs_valid(&cs[i]))
2795 return false;
2796
2797 return true;
2798 }
2799
2800 const struct ieee80211_cipher_scheme *
2801 ieee80211_cs_get(struct ieee80211_local *local, u32 cipher,
2802 enum nl80211_iftype iftype)
2803 {
2804 const struct ieee80211_cipher_scheme *l = local->hw.cipher_schemes;
2805 int n = local->hw.n_cipher_schemes;
2806 int i;
2807 const struct ieee80211_cipher_scheme *cs = NULL;
2808
2809 for (i = 0; i < n; i++) {
2810 if (l[i].cipher == cipher) {
2811 cs = &l[i];
2812 break;
2813 }
2814 }
2815
2816 if (!cs || !(cs->iftype & BIT(iftype)))
2817 return NULL;
2818
2819 return cs;
2820 }
2821
2822 int ieee80211_cs_headroom(struct ieee80211_local *local,
2823 struct cfg80211_crypto_settings *crypto,
2824 enum nl80211_iftype iftype)
2825 {
2826 const struct ieee80211_cipher_scheme *cs;
2827 int headroom = IEEE80211_ENCRYPT_HEADROOM;
2828 int i;
2829
2830 for (i = 0; i < crypto->n_ciphers_pairwise; i++) {
2831 cs = ieee80211_cs_get(local, crypto->ciphers_pairwise[i],
2832 iftype);
2833
2834 if (cs && headroom < cs->hdr_len)
2835 headroom = cs->hdr_len;
2836 }
2837
2838 cs = ieee80211_cs_get(local, crypto->cipher_group, iftype);
2839 if (cs && headroom < cs->hdr_len)
2840 headroom = cs->hdr_len;
2841
2842 return headroom;
2843 }
2844
2845 static bool
2846 ieee80211_extend_noa_desc(struct ieee80211_noa_data *data, u32 tsf, int i)
2847 {
2848 s32 end = data->desc[i].start + data->desc[i].duration - (tsf + 1);
2849 int skip;
2850
2851 if (end > 0)
2852 return false;
2853
2854 /* End time is in the past, check for repetitions */
2855 skip = DIV_ROUND_UP(-end, data->desc[i].interval);
2856 if (data->count[i] < 255) {
2857 if (data->count[i] <= skip) {
2858 data->count[i] = 0;
2859 return false;
2860 }
2861
2862 data->count[i] -= skip;
2863 }
2864
2865 data->desc[i].start += skip * data->desc[i].interval;
2866
2867 return true;
2868 }
2869
2870 static bool
2871 ieee80211_extend_absent_time(struct ieee80211_noa_data *data, u32 tsf,
2872 s32 *offset)
2873 {
2874 bool ret = false;
2875 int i;
2876
2877 for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2878 s32 cur;
2879
2880 if (!data->count[i])
2881 continue;
2882
2883 if (ieee80211_extend_noa_desc(data, tsf + *offset, i))
2884 ret = true;
2885
2886 cur = data->desc[i].start - tsf;
2887 if (cur > *offset)
2888 continue;
2889
2890 cur = data->desc[i].start + data->desc[i].duration - tsf;
2891 if (cur > *offset)
2892 *offset = cur;
2893 }
2894
2895 return ret;
2896 }
2897
2898 static u32
2899 ieee80211_get_noa_absent_time(struct ieee80211_noa_data *data, u32 tsf)
2900 {
2901 s32 offset = 0;
2902 int tries = 0;
2903 /*
2904 * arbitrary limit, used to avoid infinite loops when combined NoA
2905 * descriptors cover the full time period.
2906 */
2907 int max_tries = 5;
2908
2909 ieee80211_extend_absent_time(data, tsf, &offset);
2910 do {
2911 if (!ieee80211_extend_absent_time(data, tsf, &offset))
2912 break;
2913
2914 tries++;
2915 } while (tries < max_tries);
2916
2917 return offset;
2918 }
2919
2920 void ieee80211_update_p2p_noa(struct ieee80211_noa_data *data, u32 tsf)
2921 {
2922 u32 next_offset = BIT(31) - 1;
2923 int i;
2924
2925 data->absent = 0;
2926 data->has_next_tsf = false;
2927 for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2928 s32 start;
2929
2930 if (!data->count[i])
2931 continue;
2932
2933 ieee80211_extend_noa_desc(data, tsf, i);
2934 start = data->desc[i].start - tsf;
2935 if (start <= 0)
2936 data->absent |= BIT(i);
2937
2938 if (next_offset > start)
2939 next_offset = start;
2940
2941 data->has_next_tsf = true;
2942 }
2943
2944 if (data->absent)
2945 next_offset = ieee80211_get_noa_absent_time(data, tsf);
2946
2947 data->next_tsf = tsf + next_offset;
2948 }
2949 EXPORT_SYMBOL(ieee80211_update_p2p_noa);
2950
2951 int ieee80211_parse_p2p_noa(const struct ieee80211_p2p_noa_attr *attr,
2952 struct ieee80211_noa_data *data, u32 tsf)
2953 {
2954 int ret = 0;
2955 int i;
2956
2957 memset(data, 0, sizeof(*data));
2958
2959 for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2960 const struct ieee80211_p2p_noa_desc *desc = &attr->desc[i];
2961
2962 if (!desc->count || !desc->duration)
2963 continue;
2964
2965 data->count[i] = desc->count;
2966 data->desc[i].start = le32_to_cpu(desc->start_time);
2967 data->desc[i].duration = le32_to_cpu(desc->duration);
2968 data->desc[i].interval = le32_to_cpu(desc->interval);
2969
2970 if (data->count[i] > 1 &&
2971 data->desc[i].interval < data->desc[i].duration)
2972 continue;
2973
2974 ieee80211_extend_noa_desc(data, tsf, i);
2975 ret++;
2976 }
2977
2978 if (ret)
2979 ieee80211_update_p2p_noa(data, tsf);
2980
2981 return ret;
2982 }
2983 EXPORT_SYMBOL(ieee80211_parse_p2p_noa);
2984
2985 void ieee80211_recalc_dtim(struct ieee80211_local *local,
2986 struct ieee80211_sub_if_data *sdata)
2987 {
2988 u64 tsf = drv_get_tsf(local, sdata);
2989 u64 dtim_count = 0;
2990 u16 beacon_int = sdata->vif.bss_conf.beacon_int * 1024;
2991 u8 dtim_period = sdata->vif.bss_conf.dtim_period;
2992 struct ps_data *ps;
2993 u8 bcns_from_dtim;
2994
2995 if (tsf == -1ULL || !beacon_int || !dtim_period)
2996 return;
2997
2998 if (sdata->vif.type == NL80211_IFTYPE_AP ||
2999 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
3000 if (!sdata->bss)
3001 return;
3002
3003 ps = &sdata->bss->ps;
3004 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3005 ps = &sdata->u.mesh.ps;
3006 } else {
3007 return;
3008 }
3009
3010 /*
3011 * actually finds last dtim_count, mac80211 will update in
3012 * __beacon_add_tim().
3013 * dtim_count = dtim_period - (tsf / bcn_int) % dtim_period
3014 */
3015 do_div(tsf, beacon_int);
3016 bcns_from_dtim = do_div(tsf, dtim_period);
3017 /* just had a DTIM */
3018 if (!bcns_from_dtim)
3019 dtim_count = 0;
3020 else
3021 dtim_count = dtim_period - bcns_from_dtim;
3022
3023 ps->dtim_count = dtim_count;
3024 }
3025
3026 static u8 ieee80211_chanctx_radar_detect(struct ieee80211_local *local,
3027 struct ieee80211_chanctx *ctx)
3028 {
3029 struct ieee80211_sub_if_data *sdata;
3030 u8 radar_detect = 0;
3031
3032 lockdep_assert_held(&local->chanctx_mtx);
3033
3034 if (WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED))
3035 return 0;
3036
3037 list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
3038 if (sdata->reserved_radar_required)
3039 radar_detect |= BIT(sdata->reserved_chandef.width);
3040
3041 /*
3042 * An in-place reservation context should not have any assigned vifs
3043 * until it replaces the other context.
3044 */
3045 WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER &&
3046 !list_empty(&ctx->assigned_vifs));
3047
3048 list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
3049 if (sdata->radar_required)
3050 radar_detect |= BIT(sdata->vif.bss_conf.chandef.width);
3051
3052 return radar_detect;
3053 }
3054
3055 int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
3056 const struct cfg80211_chan_def *chandef,
3057 enum ieee80211_chanctx_mode chanmode,
3058 u8 radar_detect)
3059 {
3060 struct ieee80211_local *local = sdata->local;
3061 struct ieee80211_sub_if_data *sdata_iter;
3062 enum nl80211_iftype iftype = sdata->wdev.iftype;
3063 int num[NUM_NL80211_IFTYPES];
3064 struct ieee80211_chanctx *ctx;
3065 int num_different_channels = 0;
3066 int total = 1;
3067
3068 lockdep_assert_held(&local->chanctx_mtx);
3069
3070 if (WARN_ON(hweight32(radar_detect) > 1))
3071 return -EINVAL;
3072
3073 if (WARN_ON(chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3074 !chandef->chan))
3075 return -EINVAL;
3076
3077 if (chandef)
3078 num_different_channels = 1;
3079
3080 if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
3081 return -EINVAL;
3082
3083 /* Always allow software iftypes */
3084 if (local->hw.wiphy->software_iftypes & BIT(iftype)) {
3085 if (radar_detect)
3086 return -EINVAL;
3087 return 0;
3088 }
3089
3090 memset(num, 0, sizeof(num));
3091
3092 if (iftype != NL80211_IFTYPE_UNSPECIFIED)
3093 num[iftype] = 1;
3094
3095 list_for_each_entry(ctx, &local->chanctx_list, list) {
3096 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3097 continue;
3098 radar_detect |= ieee80211_chanctx_radar_detect(local, ctx);
3099 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) {
3100 num_different_channels++;
3101 continue;
3102 }
3103 if (chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3104 cfg80211_chandef_compatible(chandef,
3105 &ctx->conf.def))
3106 continue;
3107 num_different_channels++;
3108 }
3109
3110 list_for_each_entry_rcu(sdata_iter, &local->interfaces, list) {
3111 struct wireless_dev *wdev_iter;
3112
3113 wdev_iter = &sdata_iter->wdev;
3114
3115 if (sdata_iter == sdata ||
3116 rcu_access_pointer(sdata_iter->vif.chanctx_conf) == NULL ||
3117 local->hw.wiphy->software_iftypes & BIT(wdev_iter->iftype))
3118 continue;
3119
3120 num[wdev_iter->iftype]++;
3121 total++;
3122 }
3123
3124 if (total == 1 && !radar_detect)
3125 return 0;
3126
3127 return cfg80211_check_combinations(local->hw.wiphy,
3128 num_different_channels,
3129 radar_detect, num);
3130 }
3131
3132 static void
3133 ieee80211_iter_max_chans(const struct ieee80211_iface_combination *c,
3134 void *data)
3135 {
3136 u32 *max_num_different_channels = data;
3137
3138 *max_num_different_channels = max(*max_num_different_channels,
3139 c->num_different_channels);
3140 }
3141
3142 int ieee80211_max_num_channels(struct ieee80211_local *local)
3143 {
3144 struct ieee80211_sub_if_data *sdata;
3145 int num[NUM_NL80211_IFTYPES] = {};
3146 struct ieee80211_chanctx *ctx;
3147 int num_different_channels = 0;
3148 u8 radar_detect = 0;
3149 u32 max_num_different_channels = 1;
3150 int err;
3151
3152 lockdep_assert_held(&local->chanctx_mtx);
3153
3154 list_for_each_entry(ctx, &local->chanctx_list, list) {
3155 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3156 continue;
3157
3158 num_different_channels++;
3159
3160 radar_detect |= ieee80211_chanctx_radar_detect(local, ctx);
3161 }
3162
3163 list_for_each_entry_rcu(sdata, &local->interfaces, list)
3164 num[sdata->wdev.iftype]++;
3165
3166 err = cfg80211_iter_combinations(local->hw.wiphy,
3167 num_different_channels, radar_detect,
3168 num, ieee80211_iter_max_chans,
3169 &max_num_different_channels);
3170 if (err < 0)
3171 return err;
3172
3173 return max_num_different_channels;
3174 }
3175
3176 u8 *ieee80211_add_wmm_info_ie(u8 *buf, u8 qosinfo)
3177 {
3178 *buf++ = WLAN_EID_VENDOR_SPECIFIC;
3179 *buf++ = 7; /* len */
3180 *buf++ = 0x00; /* Microsoft OUI 00:50:F2 */
3181 *buf++ = 0x50;
3182 *buf++ = 0xf2;
3183 *buf++ = 2; /* WME */
3184 *buf++ = 0; /* WME info */
3185 *buf++ = 1; /* WME ver */
3186 *buf++ = qosinfo; /* U-APSD no in use */
3187
3188 return buf;
3189 }
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