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Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-jammy-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 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * utilities for mac80211
12 */
13
14 #include <net/mac80211.h>
15 #include <linux/netdevice.h>
16 #include <linux/export.h>
17 #include <linux/types.h>
18 #include <linux/slab.h>
19 #include <linux/skbuff.h>
20 #include <linux/etherdevice.h>
21 #include <linux/if_arp.h>
22 #include <linux/bitmap.h>
23 #include <linux/crc32.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
26 #include <net/rtnetlink.h>
27
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
30 #include "rate.h"
31 #include "mesh.h"
32 #include "wme.h"
33 #include "led.h"
34 #include "wep.h"
35
36 /* privid for wiphys to determine whether they belong to us or not */
37 const void *const mac80211_wiphy_privid = &mac80211_wiphy_privid;
38
39 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
40 {
41 struct ieee80211_local *local;
42 BUG_ON(!wiphy);
43
44 local = wiphy_priv(wiphy);
45 return &local->hw;
46 }
47 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
48
49 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
50 enum nl80211_iftype type)
51 {
52 __le16 fc = hdr->frame_control;
53
54 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
55 if (len < 16)
56 return NULL;
57
58 if (ieee80211_is_data(fc)) {
59 if (len < 24) /* drop incorrect hdr len (data) */
60 return NULL;
61
62 if (ieee80211_has_a4(fc))
63 return NULL;
64 if (ieee80211_has_tods(fc))
65 return hdr->addr1;
66 if (ieee80211_has_fromds(fc))
67 return hdr->addr2;
68
69 return hdr->addr3;
70 }
71
72 if (ieee80211_is_mgmt(fc)) {
73 if (len < 24) /* drop incorrect hdr len (mgmt) */
74 return NULL;
75 return hdr->addr3;
76 }
77
78 if (ieee80211_is_ctl(fc)) {
79 if (ieee80211_is_pspoll(fc))
80 return hdr->addr1;
81
82 if (ieee80211_is_back_req(fc)) {
83 switch (type) {
84 case NL80211_IFTYPE_STATION:
85 return hdr->addr2;
86 case NL80211_IFTYPE_AP:
87 case NL80211_IFTYPE_AP_VLAN:
88 return hdr->addr1;
89 default:
90 break; /* fall through to the return */
91 }
92 }
93 }
94
95 return NULL;
96 }
97
98 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
99 {
100 struct sk_buff *skb;
101 struct ieee80211_hdr *hdr;
102
103 skb_queue_walk(&tx->skbs, skb) {
104 hdr = (struct ieee80211_hdr *) skb->data;
105 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
106 }
107 }
108
109 int ieee80211_frame_duration(enum ieee80211_band band, size_t len,
110 int rate, int erp, int short_preamble,
111 int shift)
112 {
113 int dur;
114
115 /* calculate duration (in microseconds, rounded up to next higher
116 * integer if it includes a fractional microsecond) to send frame of
117 * len bytes (does not include FCS) at the given rate. Duration will
118 * also include SIFS.
119 *
120 * rate is in 100 kbps, so divident is multiplied by 10 in the
121 * DIV_ROUND_UP() operations.
122 *
123 * shift may be 2 for 5 MHz channels or 1 for 10 MHz channels, and
124 * is assumed to be 0 otherwise.
125 */
126
127 if (band == IEEE80211_BAND_5GHZ || erp) {
128 /*
129 * OFDM:
130 *
131 * N_DBPS = DATARATE x 4
132 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
133 * (16 = SIGNAL time, 6 = tail bits)
134 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
135 *
136 * T_SYM = 4 usec
137 * 802.11a - 18.5.2: aSIFSTime = 16 usec
138 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
139 * signal ext = 6 usec
140 */
141 dur = 16; /* SIFS + signal ext */
142 dur += 16; /* IEEE 802.11-2012 18.3.2.4: T_PREAMBLE = 16 usec */
143 dur += 4; /* IEEE 802.11-2012 18.3.2.4: T_SIGNAL = 4 usec */
144
145 /* IEEE 802.11-2012 18.3.2.4: all values above are:
146 * * times 4 for 5 MHz
147 * * times 2 for 10 MHz
148 */
149 dur *= 1 << shift;
150
151 /* rates should already consider the channel bandwidth,
152 * don't apply divisor again.
153 */
154 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
155 4 * rate); /* T_SYM x N_SYM */
156 } else {
157 /*
158 * 802.11b or 802.11g with 802.11b compatibility:
159 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
160 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
161 *
162 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
163 * aSIFSTime = 10 usec
164 * aPreambleLength = 144 usec or 72 usec with short preamble
165 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
166 */
167 dur = 10; /* aSIFSTime = 10 usec */
168 dur += short_preamble ? (72 + 24) : (144 + 48);
169
170 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
171 }
172
173 return dur;
174 }
175
176 /* Exported duration function for driver use */
177 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
178 struct ieee80211_vif *vif,
179 enum ieee80211_band band,
180 size_t frame_len,
181 struct ieee80211_rate *rate)
182 {
183 struct ieee80211_sub_if_data *sdata;
184 u16 dur;
185 int erp, shift = 0;
186 bool short_preamble = false;
187
188 erp = 0;
189 if (vif) {
190 sdata = vif_to_sdata(vif);
191 short_preamble = sdata->vif.bss_conf.use_short_preamble;
192 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
193 erp = rate->flags & IEEE80211_RATE_ERP_G;
194 shift = ieee80211_vif_get_shift(vif);
195 }
196
197 dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
198 short_preamble, shift);
199
200 return cpu_to_le16(dur);
201 }
202 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
203
204 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
205 struct ieee80211_vif *vif, size_t frame_len,
206 const struct ieee80211_tx_info *frame_txctl)
207 {
208 struct ieee80211_local *local = hw_to_local(hw);
209 struct ieee80211_rate *rate;
210 struct ieee80211_sub_if_data *sdata;
211 bool short_preamble;
212 int erp, shift = 0, bitrate;
213 u16 dur;
214 struct ieee80211_supported_band *sband;
215
216 sband = local->hw.wiphy->bands[frame_txctl->band];
217
218 short_preamble = false;
219
220 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
221
222 erp = 0;
223 if (vif) {
224 sdata = vif_to_sdata(vif);
225 short_preamble = sdata->vif.bss_conf.use_short_preamble;
226 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
227 erp = rate->flags & IEEE80211_RATE_ERP_G;
228 shift = ieee80211_vif_get_shift(vif);
229 }
230
231 bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
232
233 /* CTS duration */
234 dur = ieee80211_frame_duration(sband->band, 10, bitrate,
235 erp, short_preamble, shift);
236 /* Data frame duration */
237 dur += ieee80211_frame_duration(sband->band, frame_len, bitrate,
238 erp, short_preamble, shift);
239 /* ACK duration */
240 dur += ieee80211_frame_duration(sband->band, 10, bitrate,
241 erp, short_preamble, shift);
242
243 return cpu_to_le16(dur);
244 }
245 EXPORT_SYMBOL(ieee80211_rts_duration);
246
247 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
248 struct ieee80211_vif *vif,
249 size_t frame_len,
250 const struct ieee80211_tx_info *frame_txctl)
251 {
252 struct ieee80211_local *local = hw_to_local(hw);
253 struct ieee80211_rate *rate;
254 struct ieee80211_sub_if_data *sdata;
255 bool short_preamble;
256 int erp, shift = 0, bitrate;
257 u16 dur;
258 struct ieee80211_supported_band *sband;
259
260 sband = local->hw.wiphy->bands[frame_txctl->band];
261
262 short_preamble = false;
263
264 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
265 erp = 0;
266 if (vif) {
267 sdata = vif_to_sdata(vif);
268 short_preamble = sdata->vif.bss_conf.use_short_preamble;
269 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
270 erp = rate->flags & IEEE80211_RATE_ERP_G;
271 shift = ieee80211_vif_get_shift(vif);
272 }
273
274 bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
275
276 /* Data frame duration */
277 dur = ieee80211_frame_duration(sband->band, frame_len, bitrate,
278 erp, short_preamble, shift);
279 if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
280 /* ACK duration */
281 dur += ieee80211_frame_duration(sband->band, 10, bitrate,
282 erp, short_preamble, shift);
283 }
284
285 return cpu_to_le16(dur);
286 }
287 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
288
289 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
290 {
291 struct ieee80211_sub_if_data *sdata;
292 int n_acs = IEEE80211_NUM_ACS;
293
294 if (local->hw.queues < IEEE80211_NUM_ACS)
295 n_acs = 1;
296
297 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
298 int ac;
299
300 if (!sdata->dev)
301 continue;
302
303 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
304 local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
305 continue;
306
307 for (ac = 0; ac < n_acs; ac++) {
308 int ac_queue = sdata->vif.hw_queue[ac];
309
310 if (ac_queue == queue ||
311 (sdata->vif.cab_queue == queue &&
312 local->queue_stop_reasons[ac_queue] == 0 &&
313 skb_queue_empty(&local->pending[ac_queue])))
314 netif_wake_subqueue(sdata->dev, ac);
315 }
316 }
317 }
318
319 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
320 enum queue_stop_reason reason)
321 {
322 struct ieee80211_local *local = hw_to_local(hw);
323
324 trace_wake_queue(local, queue, reason);
325
326 if (WARN_ON(queue >= hw->queues))
327 return;
328
329 if (!test_bit(reason, &local->queue_stop_reasons[queue]))
330 return;
331
332 __clear_bit(reason, &local->queue_stop_reasons[queue]);
333
334 if (local->queue_stop_reasons[queue] != 0)
335 /* someone still has this queue stopped */
336 return;
337
338 if (skb_queue_empty(&local->pending[queue])) {
339 rcu_read_lock();
340 ieee80211_propagate_queue_wake(local, queue);
341 rcu_read_unlock();
342 } else
343 tasklet_schedule(&local->tx_pending_tasklet);
344 }
345
346 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
347 enum queue_stop_reason reason)
348 {
349 struct ieee80211_local *local = hw_to_local(hw);
350 unsigned long flags;
351
352 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
353 __ieee80211_wake_queue(hw, queue, reason);
354 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
355 }
356
357 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
358 {
359 ieee80211_wake_queue_by_reason(hw, queue,
360 IEEE80211_QUEUE_STOP_REASON_DRIVER);
361 }
362 EXPORT_SYMBOL(ieee80211_wake_queue);
363
364 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
365 enum queue_stop_reason reason)
366 {
367 struct ieee80211_local *local = hw_to_local(hw);
368 struct ieee80211_sub_if_data *sdata;
369 int n_acs = IEEE80211_NUM_ACS;
370
371 trace_stop_queue(local, queue, reason);
372
373 if (WARN_ON(queue >= hw->queues))
374 return;
375
376 if (test_bit(reason, &local->queue_stop_reasons[queue]))
377 return;
378
379 __set_bit(reason, &local->queue_stop_reasons[queue]);
380
381 if (local->hw.queues < IEEE80211_NUM_ACS)
382 n_acs = 1;
383
384 rcu_read_lock();
385 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
386 int ac;
387
388 if (!sdata->dev)
389 continue;
390
391 for (ac = 0; ac < n_acs; ac++) {
392 if (sdata->vif.hw_queue[ac] == queue ||
393 sdata->vif.cab_queue == queue)
394 netif_stop_subqueue(sdata->dev, ac);
395 }
396 }
397 rcu_read_unlock();
398 }
399
400 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
401 enum queue_stop_reason reason)
402 {
403 struct ieee80211_local *local = hw_to_local(hw);
404 unsigned long flags;
405
406 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
407 __ieee80211_stop_queue(hw, queue, reason);
408 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
409 }
410
411 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
412 {
413 ieee80211_stop_queue_by_reason(hw, queue,
414 IEEE80211_QUEUE_STOP_REASON_DRIVER);
415 }
416 EXPORT_SYMBOL(ieee80211_stop_queue);
417
418 void ieee80211_add_pending_skb(struct ieee80211_local *local,
419 struct sk_buff *skb)
420 {
421 struct ieee80211_hw *hw = &local->hw;
422 unsigned long flags;
423 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
424 int queue = info->hw_queue;
425
426 if (WARN_ON(!info->control.vif)) {
427 ieee80211_free_txskb(&local->hw, skb);
428 return;
429 }
430
431 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
432 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
433 __skb_queue_tail(&local->pending[queue], skb);
434 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
435 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
436 }
437
438 void ieee80211_add_pending_skbs(struct ieee80211_local *local,
439 struct sk_buff_head *skbs)
440 {
441 struct ieee80211_hw *hw = &local->hw;
442 struct sk_buff *skb;
443 unsigned long flags;
444 int queue, i;
445
446 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
447 while ((skb = skb_dequeue(skbs))) {
448 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
449
450 if (WARN_ON(!info->control.vif)) {
451 ieee80211_free_txskb(&local->hw, skb);
452 continue;
453 }
454
455 queue = info->hw_queue;
456
457 __ieee80211_stop_queue(hw, queue,
458 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
459
460 __skb_queue_tail(&local->pending[queue], skb);
461 }
462
463 for (i = 0; i < hw->queues; i++)
464 __ieee80211_wake_queue(hw, i,
465 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
466 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
467 }
468
469 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
470 unsigned long queues,
471 enum queue_stop_reason reason)
472 {
473 struct ieee80211_local *local = hw_to_local(hw);
474 unsigned long flags;
475 int i;
476
477 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
478
479 for_each_set_bit(i, &queues, hw->queues)
480 __ieee80211_stop_queue(hw, i, reason);
481
482 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
483 }
484
485 void ieee80211_stop_queues(struct ieee80211_hw *hw)
486 {
487 ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
488 IEEE80211_QUEUE_STOP_REASON_DRIVER);
489 }
490 EXPORT_SYMBOL(ieee80211_stop_queues);
491
492 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
493 {
494 struct ieee80211_local *local = hw_to_local(hw);
495 unsigned long flags;
496 int ret;
497
498 if (WARN_ON(queue >= hw->queues))
499 return true;
500
501 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
502 ret = test_bit(IEEE80211_QUEUE_STOP_REASON_DRIVER,
503 &local->queue_stop_reasons[queue]);
504 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
505 return ret;
506 }
507 EXPORT_SYMBOL(ieee80211_queue_stopped);
508
509 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
510 unsigned long queues,
511 enum queue_stop_reason reason)
512 {
513 struct ieee80211_local *local = hw_to_local(hw);
514 unsigned long flags;
515 int i;
516
517 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
518
519 for_each_set_bit(i, &queues, hw->queues)
520 __ieee80211_wake_queue(hw, i, reason);
521
522 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
523 }
524
525 void ieee80211_wake_queues(struct ieee80211_hw *hw)
526 {
527 ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
528 IEEE80211_QUEUE_STOP_REASON_DRIVER);
529 }
530 EXPORT_SYMBOL(ieee80211_wake_queues);
531
532 void ieee80211_flush_queues(struct ieee80211_local *local,
533 struct ieee80211_sub_if_data *sdata)
534 {
535 u32 queues;
536
537 if (!local->ops->flush)
538 return;
539
540 if (sdata && local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
541 int ac;
542
543 queues = 0;
544
545 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
546 queues |= BIT(sdata->vif.hw_queue[ac]);
547 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
548 queues |= BIT(sdata->vif.cab_queue);
549 } else {
550 /* all queues */
551 queues = BIT(local->hw.queues) - 1;
552 }
553
554 ieee80211_stop_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
555 IEEE80211_QUEUE_STOP_REASON_FLUSH);
556
557 drv_flush(local, queues, false);
558
559 ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
560 IEEE80211_QUEUE_STOP_REASON_FLUSH);
561 }
562
563 static void __iterate_active_interfaces(struct ieee80211_local *local,
564 u32 iter_flags,
565 void (*iterator)(void *data, u8 *mac,
566 struct ieee80211_vif *vif),
567 void *data)
568 {
569 struct ieee80211_sub_if_data *sdata;
570
571 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
572 switch (sdata->vif.type) {
573 case NL80211_IFTYPE_MONITOR:
574 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
575 continue;
576 break;
577 case NL80211_IFTYPE_AP_VLAN:
578 continue;
579 default:
580 break;
581 }
582 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
583 !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
584 continue;
585 if (ieee80211_sdata_running(sdata))
586 iterator(data, sdata->vif.addr,
587 &sdata->vif);
588 }
589
590 sdata = rcu_dereference_check(local->monitor_sdata,
591 lockdep_is_held(&local->iflist_mtx) ||
592 lockdep_rtnl_is_held());
593 if (sdata &&
594 (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
595 sdata->flags & IEEE80211_SDATA_IN_DRIVER))
596 iterator(data, sdata->vif.addr, &sdata->vif);
597 }
598
599 void ieee80211_iterate_active_interfaces(
600 struct ieee80211_hw *hw, u32 iter_flags,
601 void (*iterator)(void *data, u8 *mac,
602 struct ieee80211_vif *vif),
603 void *data)
604 {
605 struct ieee80211_local *local = hw_to_local(hw);
606
607 mutex_lock(&local->iflist_mtx);
608 __iterate_active_interfaces(local, iter_flags, iterator, data);
609 mutex_unlock(&local->iflist_mtx);
610 }
611 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
612
613 void ieee80211_iterate_active_interfaces_atomic(
614 struct ieee80211_hw *hw, u32 iter_flags,
615 void (*iterator)(void *data, u8 *mac,
616 struct ieee80211_vif *vif),
617 void *data)
618 {
619 struct ieee80211_local *local = hw_to_local(hw);
620
621 rcu_read_lock();
622 __iterate_active_interfaces(local, iter_flags, iterator, data);
623 rcu_read_unlock();
624 }
625 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
626
627 void ieee80211_iterate_active_interfaces_rtnl(
628 struct ieee80211_hw *hw, u32 iter_flags,
629 void (*iterator)(void *data, u8 *mac,
630 struct ieee80211_vif *vif),
631 void *data)
632 {
633 struct ieee80211_local *local = hw_to_local(hw);
634
635 ASSERT_RTNL();
636
637 __iterate_active_interfaces(local, iter_flags, iterator, data);
638 }
639 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_rtnl);
640
641 struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev)
642 {
643 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
644
645 if (!ieee80211_sdata_running(sdata) ||
646 !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
647 return NULL;
648 return &sdata->vif;
649 }
650 EXPORT_SYMBOL_GPL(wdev_to_ieee80211_vif);
651
652 /*
653 * Nothing should have been stuffed into the workqueue during
654 * the suspend->resume cycle. If this WARN is seen then there
655 * is a bug with either the driver suspend or something in
656 * mac80211 stuffing into the workqueue which we haven't yet
657 * cleared during mac80211's suspend cycle.
658 */
659 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
660 {
661 if (WARN(local->suspended && !local->resuming,
662 "queueing ieee80211 work while going to suspend\n"))
663 return false;
664
665 return true;
666 }
667
668 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
669 {
670 struct ieee80211_local *local = hw_to_local(hw);
671
672 if (!ieee80211_can_queue_work(local))
673 return;
674
675 queue_work(local->workqueue, work);
676 }
677 EXPORT_SYMBOL(ieee80211_queue_work);
678
679 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
680 struct delayed_work *dwork,
681 unsigned long delay)
682 {
683 struct ieee80211_local *local = hw_to_local(hw);
684
685 if (!ieee80211_can_queue_work(local))
686 return;
687
688 queue_delayed_work(local->workqueue, dwork, delay);
689 }
690 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
691
692 u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
693 struct ieee802_11_elems *elems,
694 u64 filter, u32 crc)
695 {
696 size_t left = len;
697 const u8 *pos = start;
698 bool calc_crc = filter != 0;
699 DECLARE_BITMAP(seen_elems, 256);
700 const u8 *ie;
701
702 bitmap_zero(seen_elems, 256);
703 memset(elems, 0, sizeof(*elems));
704 elems->ie_start = start;
705 elems->total_len = len;
706
707 while (left >= 2) {
708 u8 id, elen;
709 bool elem_parse_failed;
710
711 id = *pos++;
712 elen = *pos++;
713 left -= 2;
714
715 if (elen > left) {
716 elems->parse_error = true;
717 break;
718 }
719
720 switch (id) {
721 case WLAN_EID_SSID:
722 case WLAN_EID_SUPP_RATES:
723 case WLAN_EID_FH_PARAMS:
724 case WLAN_EID_DS_PARAMS:
725 case WLAN_EID_CF_PARAMS:
726 case WLAN_EID_TIM:
727 case WLAN_EID_IBSS_PARAMS:
728 case WLAN_EID_CHALLENGE:
729 case WLAN_EID_RSN:
730 case WLAN_EID_ERP_INFO:
731 case WLAN_EID_EXT_SUPP_RATES:
732 case WLAN_EID_HT_CAPABILITY:
733 case WLAN_EID_HT_OPERATION:
734 case WLAN_EID_VHT_CAPABILITY:
735 case WLAN_EID_VHT_OPERATION:
736 case WLAN_EID_MESH_ID:
737 case WLAN_EID_MESH_CONFIG:
738 case WLAN_EID_PEER_MGMT:
739 case WLAN_EID_PREQ:
740 case WLAN_EID_PREP:
741 case WLAN_EID_PERR:
742 case WLAN_EID_RANN:
743 case WLAN_EID_CHANNEL_SWITCH:
744 case WLAN_EID_EXT_CHANSWITCH_ANN:
745 case WLAN_EID_COUNTRY:
746 case WLAN_EID_PWR_CONSTRAINT:
747 case WLAN_EID_TIMEOUT_INTERVAL:
748 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
749 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
750 case WLAN_EID_CHAN_SWITCH_PARAM:
751 /*
752 * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
753 * that if the content gets bigger it might be needed more than once
754 */
755 if (test_bit(id, seen_elems)) {
756 elems->parse_error = true;
757 left -= elen;
758 pos += elen;
759 continue;
760 }
761 break;
762 }
763
764 if (calc_crc && id < 64 && (filter & (1ULL << id)))
765 crc = crc32_be(crc, pos - 2, elen + 2);
766
767 elem_parse_failed = false;
768
769 switch (id) {
770 case WLAN_EID_SSID:
771 elems->ssid = pos;
772 elems->ssid_len = elen;
773 break;
774 case WLAN_EID_SUPP_RATES:
775 elems->supp_rates = pos;
776 elems->supp_rates_len = elen;
777 break;
778 case WLAN_EID_DS_PARAMS:
779 if (elen >= 1)
780 elems->ds_params = pos;
781 else
782 elem_parse_failed = true;
783 break;
784 case WLAN_EID_TIM:
785 if (elen >= sizeof(struct ieee80211_tim_ie)) {
786 elems->tim = (void *)pos;
787 elems->tim_len = elen;
788 } else
789 elem_parse_failed = true;
790 break;
791 case WLAN_EID_CHALLENGE:
792 elems->challenge = pos;
793 elems->challenge_len = elen;
794 break;
795 case WLAN_EID_VENDOR_SPECIFIC:
796 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
797 pos[2] == 0xf2) {
798 /* Microsoft OUI (00:50:F2) */
799
800 if (calc_crc)
801 crc = crc32_be(crc, pos - 2, elen + 2);
802
803 if (elen >= 5 && pos[3] == 2) {
804 /* OUI Type 2 - WMM IE */
805 if (pos[4] == 0) {
806 elems->wmm_info = pos;
807 elems->wmm_info_len = elen;
808 } else if (pos[4] == 1) {
809 elems->wmm_param = pos;
810 elems->wmm_param_len = elen;
811 }
812 }
813 }
814 break;
815 case WLAN_EID_RSN:
816 elems->rsn = pos;
817 elems->rsn_len = elen;
818 break;
819 case WLAN_EID_ERP_INFO:
820 if (elen >= 1)
821 elems->erp_info = pos;
822 else
823 elem_parse_failed = true;
824 break;
825 case WLAN_EID_EXT_SUPP_RATES:
826 elems->ext_supp_rates = pos;
827 elems->ext_supp_rates_len = elen;
828 break;
829 case WLAN_EID_HT_CAPABILITY:
830 if (elen >= sizeof(struct ieee80211_ht_cap))
831 elems->ht_cap_elem = (void *)pos;
832 else
833 elem_parse_failed = true;
834 break;
835 case WLAN_EID_HT_OPERATION:
836 if (elen >= sizeof(struct ieee80211_ht_operation))
837 elems->ht_operation = (void *)pos;
838 else
839 elem_parse_failed = true;
840 break;
841 case WLAN_EID_VHT_CAPABILITY:
842 if (elen >= sizeof(struct ieee80211_vht_cap))
843 elems->vht_cap_elem = (void *)pos;
844 else
845 elem_parse_failed = true;
846 break;
847 case WLAN_EID_VHT_OPERATION:
848 if (elen >= sizeof(struct ieee80211_vht_operation))
849 elems->vht_operation = (void *)pos;
850 else
851 elem_parse_failed = true;
852 break;
853 case WLAN_EID_OPMODE_NOTIF:
854 if (elen > 0)
855 elems->opmode_notif = pos;
856 else
857 elem_parse_failed = true;
858 break;
859 case WLAN_EID_MESH_ID:
860 elems->mesh_id = pos;
861 elems->mesh_id_len = elen;
862 break;
863 case WLAN_EID_MESH_CONFIG:
864 if (elen >= sizeof(struct ieee80211_meshconf_ie))
865 elems->mesh_config = (void *)pos;
866 else
867 elem_parse_failed = true;
868 break;
869 case WLAN_EID_PEER_MGMT:
870 elems->peering = pos;
871 elems->peering_len = elen;
872 break;
873 case WLAN_EID_MESH_AWAKE_WINDOW:
874 if (elen >= 2)
875 elems->awake_window = (void *)pos;
876 break;
877 case WLAN_EID_PREQ:
878 elems->preq = pos;
879 elems->preq_len = elen;
880 break;
881 case WLAN_EID_PREP:
882 elems->prep = pos;
883 elems->prep_len = elen;
884 break;
885 case WLAN_EID_PERR:
886 elems->perr = pos;
887 elems->perr_len = elen;
888 break;
889 case WLAN_EID_RANN:
890 if (elen >= sizeof(struct ieee80211_rann_ie))
891 elems->rann = (void *)pos;
892 else
893 elem_parse_failed = true;
894 break;
895 case WLAN_EID_CHANNEL_SWITCH:
896 if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
897 elem_parse_failed = true;
898 break;
899 }
900 elems->ch_switch_ie = (void *)pos;
901 break;
902 case WLAN_EID_EXT_CHANSWITCH_ANN:
903 if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
904 elem_parse_failed = true;
905 break;
906 }
907 elems->ext_chansw_ie = (void *)pos;
908 break;
909 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
910 if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
911 elem_parse_failed = true;
912 break;
913 }
914 elems->sec_chan_offs = (void *)pos;
915 break;
916 case WLAN_EID_CHAN_SWITCH_PARAM:
917 if (elen !=
918 sizeof(*elems->mesh_chansw_params_ie)) {
919 elem_parse_failed = true;
920 break;
921 }
922 elems->mesh_chansw_params_ie = (void *)pos;
923 break;
924 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
925 if (!action ||
926 elen != sizeof(*elems->wide_bw_chansw_ie)) {
927 elem_parse_failed = true;
928 break;
929 }
930 elems->wide_bw_chansw_ie = (void *)pos;
931 break;
932 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
933 if (action) {
934 elem_parse_failed = true;
935 break;
936 }
937 /*
938 * This is a bit tricky, but as we only care about
939 * the wide bandwidth channel switch element, so
940 * just parse it out manually.
941 */
942 ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
943 pos, elen);
944 if (ie) {
945 if (ie[1] == sizeof(*elems->wide_bw_chansw_ie))
946 elems->wide_bw_chansw_ie =
947 (void *)(ie + 2);
948 else
949 elem_parse_failed = true;
950 }
951 break;
952 case WLAN_EID_COUNTRY:
953 elems->country_elem = pos;
954 elems->country_elem_len = elen;
955 break;
956 case WLAN_EID_PWR_CONSTRAINT:
957 if (elen != 1) {
958 elem_parse_failed = true;
959 break;
960 }
961 elems->pwr_constr_elem = pos;
962 break;
963 case WLAN_EID_TIMEOUT_INTERVAL:
964 if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
965 elems->timeout_int = (void *)pos;
966 else
967 elem_parse_failed = true;
968 break;
969 default:
970 break;
971 }
972
973 if (elem_parse_failed)
974 elems->parse_error = true;
975 else
976 __set_bit(id, seen_elems);
977
978 left -= elen;
979 pos += elen;
980 }
981
982 if (left != 0)
983 elems->parse_error = true;
984
985 return crc;
986 }
987
988 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
989 bool bss_notify)
990 {
991 struct ieee80211_local *local = sdata->local;
992 struct ieee80211_tx_queue_params qparam;
993 struct ieee80211_chanctx_conf *chanctx_conf;
994 int ac;
995 bool use_11b, enable_qos;
996 int aCWmin, aCWmax;
997
998 if (!local->ops->conf_tx)
999 return;
1000
1001 if (local->hw.queues < IEEE80211_NUM_ACS)
1002 return;
1003
1004 memset(&qparam, 0, sizeof(qparam));
1005
1006 rcu_read_lock();
1007 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1008 use_11b = (chanctx_conf &&
1009 chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) &&
1010 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
1011 rcu_read_unlock();
1012
1013 /*
1014 * By default disable QoS in STA mode for old access points, which do
1015 * not support 802.11e. New APs will provide proper queue parameters,
1016 * that we will configure later.
1017 */
1018 enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
1019
1020 /* Set defaults according to 802.11-2007 Table 7-37 */
1021 aCWmax = 1023;
1022 if (use_11b)
1023 aCWmin = 31;
1024 else
1025 aCWmin = 15;
1026
1027 /* Confiure old 802.11b/g medium access rules. */
1028 qparam.cw_max = aCWmax;
1029 qparam.cw_min = aCWmin;
1030 qparam.txop = 0;
1031 qparam.aifs = 2;
1032
1033 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1034 /* Update if QoS is enabled. */
1035 if (enable_qos) {
1036 switch (ac) {
1037 case IEEE80211_AC_BK:
1038 qparam.cw_max = aCWmax;
1039 qparam.cw_min = aCWmin;
1040 qparam.txop = 0;
1041 qparam.aifs = 7;
1042 break;
1043 /* never happens but let's not leave undefined */
1044 default:
1045 case IEEE80211_AC_BE:
1046 qparam.cw_max = aCWmax;
1047 qparam.cw_min = aCWmin;
1048 qparam.txop = 0;
1049 qparam.aifs = 3;
1050 break;
1051 case IEEE80211_AC_VI:
1052 qparam.cw_max = aCWmin;
1053 qparam.cw_min = (aCWmin + 1) / 2 - 1;
1054 if (use_11b)
1055 qparam.txop = 6016/32;
1056 else
1057 qparam.txop = 3008/32;
1058 qparam.aifs = 2;
1059 break;
1060 case IEEE80211_AC_VO:
1061 qparam.cw_max = (aCWmin + 1) / 2 - 1;
1062 qparam.cw_min = (aCWmin + 1) / 4 - 1;
1063 if (use_11b)
1064 qparam.txop = 3264/32;
1065 else
1066 qparam.txop = 1504/32;
1067 qparam.aifs = 2;
1068 break;
1069 }
1070 }
1071
1072 qparam.uapsd = false;
1073
1074 sdata->tx_conf[ac] = qparam;
1075 drv_conf_tx(local, sdata, ac, &qparam);
1076 }
1077
1078 if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1079 sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
1080 sdata->vif.bss_conf.qos = enable_qos;
1081 if (bss_notify)
1082 ieee80211_bss_info_change_notify(sdata,
1083 BSS_CHANGED_QOS);
1084 }
1085 }
1086
1087 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1088 u16 transaction, u16 auth_alg, u16 status,
1089 const u8 *extra, size_t extra_len, const u8 *da,
1090 const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1091 u32 tx_flags)
1092 {
1093 struct ieee80211_local *local = sdata->local;
1094 struct sk_buff *skb;
1095 struct ieee80211_mgmt *mgmt;
1096 int err;
1097
1098 /* 24 + 6 = header + auth_algo + auth_transaction + status_code */
1099 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24 + 6 + extra_len);
1100 if (!skb)
1101 return;
1102
1103 skb_reserve(skb, local->hw.extra_tx_headroom);
1104
1105 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1106 memset(mgmt, 0, 24 + 6);
1107 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1108 IEEE80211_STYPE_AUTH);
1109 memcpy(mgmt->da, da, ETH_ALEN);
1110 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1111 memcpy(mgmt->bssid, bssid, ETH_ALEN);
1112 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1113 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1114 mgmt->u.auth.status_code = cpu_to_le16(status);
1115 if (extra)
1116 memcpy(skb_put(skb, extra_len), extra, extra_len);
1117
1118 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1119 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1120 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1121 WARN_ON(err);
1122 }
1123
1124 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1125 tx_flags;
1126 ieee80211_tx_skb(sdata, skb);
1127 }
1128
1129 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1130 const u8 *bssid, u16 stype, u16 reason,
1131 bool send_frame, u8 *frame_buf)
1132 {
1133 struct ieee80211_local *local = sdata->local;
1134 struct sk_buff *skb;
1135 struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1136
1137 /* build frame */
1138 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1139 mgmt->duration = 0; /* initialize only */
1140 mgmt->seq_ctrl = 0; /* initialize only */
1141 memcpy(mgmt->da, bssid, ETH_ALEN);
1142 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1143 memcpy(mgmt->bssid, bssid, ETH_ALEN);
1144 /* u.deauth.reason_code == u.disassoc.reason_code */
1145 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1146
1147 if (send_frame) {
1148 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1149 IEEE80211_DEAUTH_FRAME_LEN);
1150 if (!skb)
1151 return;
1152
1153 skb_reserve(skb, local->hw.extra_tx_headroom);
1154
1155 /* copy in frame */
1156 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1157 mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1158
1159 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1160 !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1161 IEEE80211_SKB_CB(skb)->flags |=
1162 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1163
1164 ieee80211_tx_skb(sdata, skb);
1165 }
1166 }
1167
1168 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1169 size_t buffer_len, const u8 *ie, size_t ie_len,
1170 enum ieee80211_band band, u32 rate_mask,
1171 struct cfg80211_chan_def *chandef)
1172 {
1173 struct ieee80211_supported_band *sband;
1174 u8 *pos = buffer, *end = buffer + buffer_len;
1175 size_t offset = 0, noffset;
1176 int supp_rates_len, i;
1177 u8 rates[32];
1178 int num_rates;
1179 int ext_rates_len;
1180 int shift;
1181 u32 rate_flags;
1182
1183 sband = local->hw.wiphy->bands[band];
1184 if (WARN_ON_ONCE(!sband))
1185 return 0;
1186
1187 rate_flags = ieee80211_chandef_rate_flags(chandef);
1188 shift = ieee80211_chandef_get_shift(chandef);
1189
1190 num_rates = 0;
1191 for (i = 0; i < sband->n_bitrates; i++) {
1192 if ((BIT(i) & rate_mask) == 0)
1193 continue; /* skip rate */
1194 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1195 continue;
1196
1197 rates[num_rates++] =
1198 (u8) DIV_ROUND_UP(sband->bitrates[i].bitrate,
1199 (1 << shift) * 5);
1200 }
1201
1202 supp_rates_len = min_t(int, num_rates, 8);
1203
1204 if (end - pos < 2 + supp_rates_len)
1205 goto out_err;
1206 *pos++ = WLAN_EID_SUPP_RATES;
1207 *pos++ = supp_rates_len;
1208 memcpy(pos, rates, supp_rates_len);
1209 pos += supp_rates_len;
1210
1211 /* insert "request information" if in custom IEs */
1212 if (ie && ie_len) {
1213 static const u8 before_extrates[] = {
1214 WLAN_EID_SSID,
1215 WLAN_EID_SUPP_RATES,
1216 WLAN_EID_REQUEST,
1217 };
1218 noffset = ieee80211_ie_split(ie, ie_len,
1219 before_extrates,
1220 ARRAY_SIZE(before_extrates),
1221 offset);
1222 if (end - pos < noffset - offset)
1223 goto out_err;
1224 memcpy(pos, ie + offset, noffset - offset);
1225 pos += noffset - offset;
1226 offset = noffset;
1227 }
1228
1229 ext_rates_len = num_rates - supp_rates_len;
1230 if (ext_rates_len > 0) {
1231 if (end - pos < 2 + ext_rates_len)
1232 goto out_err;
1233 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1234 *pos++ = ext_rates_len;
1235 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1236 pos += ext_rates_len;
1237 }
1238
1239 if (chandef->chan && sband->band == IEEE80211_BAND_2GHZ) {
1240 if (end - pos < 3)
1241 goto out_err;
1242 *pos++ = WLAN_EID_DS_PARAMS;
1243 *pos++ = 1;
1244 *pos++ = ieee80211_frequency_to_channel(
1245 chandef->chan->center_freq);
1246 }
1247
1248 /* insert custom IEs that go before HT */
1249 if (ie && ie_len) {
1250 static const u8 before_ht[] = {
1251 WLAN_EID_SSID,
1252 WLAN_EID_SUPP_RATES,
1253 WLAN_EID_REQUEST,
1254 WLAN_EID_EXT_SUPP_RATES,
1255 WLAN_EID_DS_PARAMS,
1256 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1257 };
1258 noffset = ieee80211_ie_split(ie, ie_len,
1259 before_ht, ARRAY_SIZE(before_ht),
1260 offset);
1261 if (end - pos < noffset - offset)
1262 goto out_err;
1263 memcpy(pos, ie + offset, noffset - offset);
1264 pos += noffset - offset;
1265 offset = noffset;
1266 }
1267
1268 if (sband->ht_cap.ht_supported) {
1269 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1270 goto out_err;
1271 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1272 sband->ht_cap.cap);
1273 }
1274
1275 /*
1276 * If adding more here, adjust code in main.c
1277 * that calculates local->scan_ies_len.
1278 */
1279
1280 /* insert custom IEs that go before VHT */
1281 if (ie && ie_len) {
1282 static const u8 before_vht[] = {
1283 WLAN_EID_SSID,
1284 WLAN_EID_SUPP_RATES,
1285 WLAN_EID_REQUEST,
1286 WLAN_EID_EXT_SUPP_RATES,
1287 WLAN_EID_DS_PARAMS,
1288 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1289 WLAN_EID_HT_CAPABILITY,
1290 WLAN_EID_BSS_COEX_2040,
1291 WLAN_EID_EXT_CAPABILITY,
1292 WLAN_EID_SSID_LIST,
1293 WLAN_EID_CHANNEL_USAGE,
1294 WLAN_EID_INTERWORKING,
1295 /* mesh ID can't happen here */
1296 /* 60 GHz can't happen here right now */
1297 };
1298 noffset = ieee80211_ie_split(ie, ie_len,
1299 before_vht, ARRAY_SIZE(before_vht),
1300 offset);
1301 if (end - pos < noffset - offset)
1302 goto out_err;
1303 memcpy(pos, ie + offset, noffset - offset);
1304 pos += noffset - offset;
1305 offset = noffset;
1306 }
1307
1308 if (sband->vht_cap.vht_supported) {
1309 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1310 goto out_err;
1311 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1312 sband->vht_cap.cap);
1313 }
1314
1315 /* add any remaining custom IEs */
1316 if (ie && ie_len) {
1317 noffset = ie_len;
1318 if (end - pos < noffset - offset)
1319 goto out_err;
1320 memcpy(pos, ie + offset, noffset - offset);
1321 pos += noffset - offset;
1322 }
1323
1324 return pos - buffer;
1325 out_err:
1326 WARN_ONCE(1, "not enough space for preq IEs\n");
1327 return pos - buffer;
1328 }
1329
1330 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1331 u8 *dst, u32 ratemask,
1332 struct ieee80211_channel *chan,
1333 const u8 *ssid, size_t ssid_len,
1334 const u8 *ie, size_t ie_len,
1335 bool directed)
1336 {
1337 struct ieee80211_local *local = sdata->local;
1338 struct cfg80211_chan_def chandef;
1339 struct sk_buff *skb;
1340 struct ieee80211_mgmt *mgmt;
1341 int ies_len;
1342
1343 /*
1344 * Do not send DS Channel parameter for directed probe requests
1345 * in order to maximize the chance that we get a response. Some
1346 * badly-behaved APs don't respond when this parameter is included.
1347 */
1348 chandef.width = sdata->vif.bss_conf.chandef.width;
1349 if (directed)
1350 chandef.chan = NULL;
1351 else
1352 chandef.chan = chan;
1353
1354 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1355 ssid, ssid_len, 100 + ie_len);
1356 if (!skb)
1357 return NULL;
1358
1359 ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1360 skb_tailroom(skb),
1361 ie, ie_len, chan->band,
1362 ratemask, &chandef);
1363 skb_put(skb, ies_len);
1364
1365 if (dst) {
1366 mgmt = (struct ieee80211_mgmt *) skb->data;
1367 memcpy(mgmt->da, dst, ETH_ALEN);
1368 memcpy(mgmt->bssid, dst, ETH_ALEN);
1369 }
1370
1371 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1372
1373 return skb;
1374 }
1375
1376 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1377 const u8 *ssid, size_t ssid_len,
1378 const u8 *ie, size_t ie_len,
1379 u32 ratemask, bool directed, u32 tx_flags,
1380 struct ieee80211_channel *channel, bool scan)
1381 {
1382 struct sk_buff *skb;
1383
1384 skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1385 ssid, ssid_len,
1386 ie, ie_len, directed);
1387 if (skb) {
1388 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
1389 if (scan)
1390 ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1391 else
1392 ieee80211_tx_skb(sdata, skb);
1393 }
1394 }
1395
1396 u32 ieee80211_sta_get_rates(struct ieee80211_sub_if_data *sdata,
1397 struct ieee802_11_elems *elems,
1398 enum ieee80211_band band, u32 *basic_rates)
1399 {
1400 struct ieee80211_supported_band *sband;
1401 size_t num_rates;
1402 u32 supp_rates, rate_flags;
1403 int i, j, shift;
1404 sband = sdata->local->hw.wiphy->bands[band];
1405
1406 rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
1407 shift = ieee80211_vif_get_shift(&sdata->vif);
1408
1409 if (WARN_ON(!sband))
1410 return 1;
1411
1412 num_rates = sband->n_bitrates;
1413 supp_rates = 0;
1414 for (i = 0; i < elems->supp_rates_len +
1415 elems->ext_supp_rates_len; i++) {
1416 u8 rate = 0;
1417 int own_rate;
1418 bool is_basic;
1419 if (i < elems->supp_rates_len)
1420 rate = elems->supp_rates[i];
1421 else if (elems->ext_supp_rates)
1422 rate = elems->ext_supp_rates
1423 [i - elems->supp_rates_len];
1424 own_rate = 5 * (rate & 0x7f);
1425 is_basic = !!(rate & 0x80);
1426
1427 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1428 continue;
1429
1430 for (j = 0; j < num_rates; j++) {
1431 int brate;
1432 if ((rate_flags & sband->bitrates[j].flags)
1433 != rate_flags)
1434 continue;
1435
1436 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
1437 1 << shift);
1438
1439 if (brate == own_rate) {
1440 supp_rates |= BIT(j);
1441 if (basic_rates && is_basic)
1442 *basic_rates |= BIT(j);
1443 }
1444 }
1445 }
1446 return supp_rates;
1447 }
1448
1449 void ieee80211_stop_device(struct ieee80211_local *local)
1450 {
1451 ieee80211_led_radio(local, false);
1452 ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1453
1454 cancel_work_sync(&local->reconfig_filter);
1455
1456 flush_workqueue(local->workqueue);
1457 drv_stop(local);
1458 }
1459
1460 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1461 struct ieee80211_sub_if_data *sdata)
1462 {
1463 struct ieee80211_chanctx_conf *conf;
1464 struct ieee80211_chanctx *ctx;
1465
1466 if (!local->use_chanctx)
1467 return;
1468
1469 mutex_lock(&local->chanctx_mtx);
1470 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1471 lockdep_is_held(&local->chanctx_mtx));
1472 if (conf) {
1473 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1474 drv_assign_vif_chanctx(local, sdata, ctx);
1475 }
1476 mutex_unlock(&local->chanctx_mtx);
1477 }
1478
1479 int ieee80211_reconfig(struct ieee80211_local *local)
1480 {
1481 struct ieee80211_hw *hw = &local->hw;
1482 struct ieee80211_sub_if_data *sdata;
1483 struct ieee80211_chanctx *ctx;
1484 struct sta_info *sta;
1485 int res, i;
1486 bool reconfig_due_to_wowlan = false;
1487 struct ieee80211_sub_if_data *sched_scan_sdata;
1488 bool sched_scan_stopped = false;
1489
1490 #ifdef CONFIG_PM
1491 if (local->suspended)
1492 local->resuming = true;
1493
1494 if (local->wowlan) {
1495 res = drv_resume(local);
1496 local->wowlan = false;
1497 if (res < 0) {
1498 local->resuming = false;
1499 return res;
1500 }
1501 if (res == 0)
1502 goto wake_up;
1503 WARN_ON(res > 1);
1504 /*
1505 * res is 1, which means the driver requested
1506 * to go through a regular reset on wakeup.
1507 */
1508 reconfig_due_to_wowlan = true;
1509 }
1510 #endif
1511 /* everything else happens only if HW was up & running */
1512 if (!local->open_count)
1513 goto wake_up;
1514
1515 /*
1516 * Upon resume hardware can sometimes be goofy due to
1517 * various platform / driver / bus issues, so restarting
1518 * the device may at times not work immediately. Propagate
1519 * the error.
1520 */
1521 res = drv_start(local);
1522 if (res) {
1523 WARN(local->suspended, "Hardware became unavailable "
1524 "upon resume. This could be a software issue "
1525 "prior to suspend or a hardware issue.\n");
1526 return res;
1527 }
1528
1529 /* setup fragmentation threshold */
1530 drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1531
1532 /* setup RTS threshold */
1533 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1534
1535 /* reset coverage class */
1536 drv_set_coverage_class(local, hw->wiphy->coverage_class);
1537
1538 ieee80211_led_radio(local, true);
1539 ieee80211_mod_tpt_led_trig(local,
1540 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1541
1542 /* add interfaces */
1543 sdata = rtnl_dereference(local->monitor_sdata);
1544 if (sdata) {
1545 /* in HW restart it exists already */
1546 WARN_ON(local->resuming);
1547 res = drv_add_interface(local, sdata);
1548 if (WARN_ON(res)) {
1549 rcu_assign_pointer(local->monitor_sdata, NULL);
1550 synchronize_net();
1551 kfree(sdata);
1552 }
1553 }
1554
1555 list_for_each_entry(sdata, &local->interfaces, list) {
1556 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1557 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1558 ieee80211_sdata_running(sdata))
1559 res = drv_add_interface(local, sdata);
1560 }
1561
1562 /* add channel contexts */
1563 if (local->use_chanctx) {
1564 mutex_lock(&local->chanctx_mtx);
1565 list_for_each_entry(ctx, &local->chanctx_list, list)
1566 WARN_ON(drv_add_chanctx(local, ctx));
1567 mutex_unlock(&local->chanctx_mtx);
1568 }
1569
1570 list_for_each_entry(sdata, &local->interfaces, list) {
1571 if (!ieee80211_sdata_running(sdata))
1572 continue;
1573 ieee80211_assign_chanctx(local, sdata);
1574 }
1575
1576 sdata = rtnl_dereference(local->monitor_sdata);
1577 if (sdata && ieee80211_sdata_running(sdata))
1578 ieee80211_assign_chanctx(local, sdata);
1579
1580 /* add STAs back */
1581 mutex_lock(&local->sta_mtx);
1582 list_for_each_entry(sta, &local->sta_list, list) {
1583 enum ieee80211_sta_state state;
1584
1585 if (!sta->uploaded)
1586 continue;
1587
1588 /* AP-mode stations will be added later */
1589 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1590 continue;
1591
1592 for (state = IEEE80211_STA_NOTEXIST;
1593 state < sta->sta_state; state++)
1594 WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1595 state + 1));
1596 }
1597 mutex_unlock(&local->sta_mtx);
1598
1599 /* reconfigure tx conf */
1600 if (hw->queues >= IEEE80211_NUM_ACS) {
1601 list_for_each_entry(sdata, &local->interfaces, list) {
1602 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1603 sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1604 !ieee80211_sdata_running(sdata))
1605 continue;
1606
1607 for (i = 0; i < IEEE80211_NUM_ACS; i++)
1608 drv_conf_tx(local, sdata, i,
1609 &sdata->tx_conf[i]);
1610 }
1611 }
1612
1613 /* reconfigure hardware */
1614 ieee80211_hw_config(local, ~0);
1615
1616 ieee80211_configure_filter(local);
1617
1618 /* Finally also reconfigure all the BSS information */
1619 list_for_each_entry(sdata, &local->interfaces, list) {
1620 u32 changed;
1621
1622 if (!ieee80211_sdata_running(sdata))
1623 continue;
1624
1625 /* common change flags for all interface types */
1626 changed = BSS_CHANGED_ERP_CTS_PROT |
1627 BSS_CHANGED_ERP_PREAMBLE |
1628 BSS_CHANGED_ERP_SLOT |
1629 BSS_CHANGED_HT |
1630 BSS_CHANGED_BASIC_RATES |
1631 BSS_CHANGED_BEACON_INT |
1632 BSS_CHANGED_BSSID |
1633 BSS_CHANGED_CQM |
1634 BSS_CHANGED_QOS |
1635 BSS_CHANGED_IDLE |
1636 BSS_CHANGED_TXPOWER;
1637
1638 switch (sdata->vif.type) {
1639 case NL80211_IFTYPE_STATION:
1640 changed |= BSS_CHANGED_ASSOC |
1641 BSS_CHANGED_ARP_FILTER |
1642 BSS_CHANGED_PS;
1643
1644 /* Re-send beacon info report to the driver */
1645 if (sdata->u.mgd.have_beacon)
1646 changed |= BSS_CHANGED_BEACON_INFO;
1647
1648 sdata_lock(sdata);
1649 ieee80211_bss_info_change_notify(sdata, changed);
1650 sdata_unlock(sdata);
1651 break;
1652 case NL80211_IFTYPE_ADHOC:
1653 changed |= BSS_CHANGED_IBSS;
1654 /* fall through */
1655 case NL80211_IFTYPE_AP:
1656 changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1657
1658 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1659 changed |= BSS_CHANGED_AP_PROBE_RESP;
1660
1661 if (rcu_access_pointer(sdata->u.ap.beacon))
1662 drv_start_ap(local, sdata);
1663 }
1664
1665 /* fall through */
1666 case NL80211_IFTYPE_MESH_POINT:
1667 if (sdata->vif.bss_conf.enable_beacon) {
1668 changed |= BSS_CHANGED_BEACON |
1669 BSS_CHANGED_BEACON_ENABLED;
1670 ieee80211_bss_info_change_notify(sdata, changed);
1671 }
1672 break;
1673 case NL80211_IFTYPE_WDS:
1674 break;
1675 case NL80211_IFTYPE_AP_VLAN:
1676 case NL80211_IFTYPE_MONITOR:
1677 /* ignore virtual */
1678 break;
1679 case NL80211_IFTYPE_P2P_DEVICE:
1680 changed = BSS_CHANGED_IDLE;
1681 break;
1682 case NL80211_IFTYPE_UNSPECIFIED:
1683 case NUM_NL80211_IFTYPES:
1684 case NL80211_IFTYPE_P2P_CLIENT:
1685 case NL80211_IFTYPE_P2P_GO:
1686 WARN_ON(1);
1687 break;
1688 }
1689 }
1690
1691 ieee80211_recalc_ps(local, -1);
1692
1693 /*
1694 * The sta might be in psm against the ap (e.g. because
1695 * this was the state before a hw restart), so we
1696 * explicitly send a null packet in order to make sure
1697 * it'll sync against the ap (and get out of psm).
1698 */
1699 if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1700 list_for_each_entry(sdata, &local->interfaces, list) {
1701 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1702 continue;
1703 if (!sdata->u.mgd.associated)
1704 continue;
1705
1706 ieee80211_send_nullfunc(local, sdata, 0);
1707 }
1708 }
1709
1710 /* APs are now beaconing, add back stations */
1711 mutex_lock(&local->sta_mtx);
1712 list_for_each_entry(sta, &local->sta_list, list) {
1713 enum ieee80211_sta_state state;
1714
1715 if (!sta->uploaded)
1716 continue;
1717
1718 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1719 continue;
1720
1721 for (state = IEEE80211_STA_NOTEXIST;
1722 state < sta->sta_state; state++)
1723 WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1724 state + 1));
1725 }
1726 mutex_unlock(&local->sta_mtx);
1727
1728 /* add back keys */
1729 list_for_each_entry(sdata, &local->interfaces, list)
1730 if (ieee80211_sdata_running(sdata))
1731 ieee80211_enable_keys(sdata);
1732
1733 wake_up:
1734 local->in_reconfig = false;
1735 barrier();
1736
1737 if (local->monitors == local->open_count && local->monitors > 0)
1738 ieee80211_add_virtual_monitor(local);
1739
1740 /*
1741 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1742 * sessions can be established after a resume.
1743 *
1744 * Also tear down aggregation sessions since reconfiguring
1745 * them in a hardware restart scenario is not easily done
1746 * right now, and the hardware will have lost information
1747 * about the sessions, but we and the AP still think they
1748 * are active. This is really a workaround though.
1749 */
1750 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1751 mutex_lock(&local->sta_mtx);
1752
1753 list_for_each_entry(sta, &local->sta_list, list) {
1754 ieee80211_sta_tear_down_BA_sessions(
1755 sta, AGG_STOP_LOCAL_REQUEST);
1756 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1757 }
1758
1759 mutex_unlock(&local->sta_mtx);
1760 }
1761
1762 ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
1763 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1764
1765 /*
1766 * Reconfigure sched scan if it was interrupted by FW restart or
1767 * suspend.
1768 */
1769 mutex_lock(&local->mtx);
1770 sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1771 lockdep_is_held(&local->mtx));
1772 if (sched_scan_sdata && local->sched_scan_req)
1773 /*
1774 * Sched scan stopped, but we don't want to report it. Instead,
1775 * we're trying to reschedule.
1776 */
1777 if (__ieee80211_request_sched_scan_start(sched_scan_sdata,
1778 local->sched_scan_req))
1779 sched_scan_stopped = true;
1780 mutex_unlock(&local->mtx);
1781
1782 if (sched_scan_stopped)
1783 cfg80211_sched_scan_stopped_rtnl(local->hw.wiphy);
1784
1785 /*
1786 * If this is for hw restart things are still running.
1787 * We may want to change that later, however.
1788 */
1789 if (!local->suspended || reconfig_due_to_wowlan)
1790 drv_restart_complete(local);
1791
1792 if (!local->suspended)
1793 return 0;
1794
1795 #ifdef CONFIG_PM
1796 /* first set suspended false, then resuming */
1797 local->suspended = false;
1798 mb();
1799 local->resuming = false;
1800
1801 list_for_each_entry(sdata, &local->interfaces, list) {
1802 if (!ieee80211_sdata_running(sdata))
1803 continue;
1804 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1805 ieee80211_sta_restart(sdata);
1806 }
1807
1808 mod_timer(&local->sta_cleanup, jiffies + 1);
1809 #else
1810 WARN_ON(1);
1811 #endif
1812
1813 return 0;
1814 }
1815
1816 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1817 {
1818 struct ieee80211_sub_if_data *sdata;
1819 struct ieee80211_local *local;
1820 struct ieee80211_key *key;
1821
1822 if (WARN_ON(!vif))
1823 return;
1824
1825 sdata = vif_to_sdata(vif);
1826 local = sdata->local;
1827
1828 if (WARN_ON(!local->resuming))
1829 return;
1830
1831 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1832 return;
1833
1834 sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1835
1836 mutex_lock(&local->key_mtx);
1837 list_for_each_entry(key, &sdata->key_list, list)
1838 key->flags |= KEY_FLAG_TAINTED;
1839 mutex_unlock(&local->key_mtx);
1840 }
1841 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1842
1843 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
1844 {
1845 struct ieee80211_local *local = sdata->local;
1846 struct ieee80211_chanctx_conf *chanctx_conf;
1847 struct ieee80211_chanctx *chanctx;
1848
1849 mutex_lock(&local->chanctx_mtx);
1850
1851 chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1852 lockdep_is_held(&local->chanctx_mtx));
1853
1854 if (WARN_ON_ONCE(!chanctx_conf))
1855 goto unlock;
1856
1857 chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
1858 ieee80211_recalc_smps_chanctx(local, chanctx);
1859 unlock:
1860 mutex_unlock(&local->chanctx_mtx);
1861 }
1862
1863 void ieee80211_recalc_min_chandef(struct ieee80211_sub_if_data *sdata)
1864 {
1865 struct ieee80211_local *local = sdata->local;
1866 struct ieee80211_chanctx_conf *chanctx_conf;
1867 struct ieee80211_chanctx *chanctx;
1868
1869 mutex_lock(&local->chanctx_mtx);
1870
1871 chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1872 lockdep_is_held(&local->chanctx_mtx));
1873
1874 if (WARN_ON_ONCE(!chanctx_conf))
1875 goto unlock;
1876
1877 chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
1878 ieee80211_recalc_chanctx_min_def(local, chanctx);
1879 unlock:
1880 mutex_unlock(&local->chanctx_mtx);
1881 }
1882
1883 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1884 {
1885 int i;
1886
1887 for (i = 0; i < n_ids; i++)
1888 if (ids[i] == id)
1889 return true;
1890 return false;
1891 }
1892
1893 /**
1894 * ieee80211_ie_split - split an IE buffer according to ordering
1895 *
1896 * @ies: the IE buffer
1897 * @ielen: the length of the IE buffer
1898 * @ids: an array with element IDs that are allowed before
1899 * the split
1900 * @n_ids: the size of the element ID array
1901 * @offset: offset where to start splitting in the buffer
1902 *
1903 * This function splits an IE buffer by updating the @offset
1904 * variable to point to the location where the buffer should be
1905 * split.
1906 *
1907 * It assumes that the given IE buffer is well-formed, this
1908 * has to be guaranteed by the caller!
1909 *
1910 * It also assumes that the IEs in the buffer are ordered
1911 * correctly, if not the result of using this function will not
1912 * be ordered correctly either, i.e. it does no reordering.
1913 *
1914 * The function returns the offset where the next part of the
1915 * buffer starts, which may be @ielen if the entire (remainder)
1916 * of the buffer should be used.
1917 */
1918 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1919 const u8 *ids, int n_ids, size_t offset)
1920 {
1921 size_t pos = offset;
1922
1923 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1924 pos += 2 + ies[pos + 1];
1925
1926 return pos;
1927 }
1928
1929 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1930 {
1931 size_t pos = offset;
1932
1933 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1934 pos += 2 + ies[pos + 1];
1935
1936 return pos;
1937 }
1938
1939 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1940 int rssi_min_thold,
1941 int rssi_max_thold)
1942 {
1943 trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1944
1945 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1946 return;
1947
1948 /*
1949 * Scale up threshold values before storing it, as the RSSI averaging
1950 * algorithm uses a scaled up value as well. Change this scaling
1951 * factor if the RSSI averaging algorithm changes.
1952 */
1953 sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1954 sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1955 }
1956
1957 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1958 int rssi_min_thold,
1959 int rssi_max_thold)
1960 {
1961 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1962
1963 WARN_ON(rssi_min_thold == rssi_max_thold ||
1964 rssi_min_thold > rssi_max_thold);
1965
1966 _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1967 rssi_max_thold);
1968 }
1969 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1970
1971 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1972 {
1973 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1974
1975 _ieee80211_enable_rssi_reports(sdata, 0, 0);
1976 }
1977 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1978
1979 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1980 u16 cap)
1981 {
1982 __le16 tmp;
1983
1984 *pos++ = WLAN_EID_HT_CAPABILITY;
1985 *pos++ = sizeof(struct ieee80211_ht_cap);
1986 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1987
1988 /* capability flags */
1989 tmp = cpu_to_le16(cap);
1990 memcpy(pos, &tmp, sizeof(u16));
1991 pos += sizeof(u16);
1992
1993 /* AMPDU parameters */
1994 *pos++ = ht_cap->ampdu_factor |
1995 (ht_cap->ampdu_density <<
1996 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1997
1998 /* MCS set */
1999 memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
2000 pos += sizeof(ht_cap->mcs);
2001
2002 /* extended capabilities */
2003 pos += sizeof(__le16);
2004
2005 /* BF capabilities */
2006 pos += sizeof(__le32);
2007
2008 /* antenna selection */
2009 pos += sizeof(u8);
2010
2011 return pos;
2012 }
2013
2014 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2015 u32 cap)
2016 {
2017 __le32 tmp;
2018
2019 *pos++ = WLAN_EID_VHT_CAPABILITY;
2020 *pos++ = sizeof(struct ieee80211_vht_cap);
2021 memset(pos, 0, sizeof(struct ieee80211_vht_cap));
2022
2023 /* capability flags */
2024 tmp = cpu_to_le32(cap);
2025 memcpy(pos, &tmp, sizeof(u32));
2026 pos += sizeof(u32);
2027
2028 /* VHT MCS set */
2029 memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
2030 pos += sizeof(vht_cap->vht_mcs);
2031
2032 return pos;
2033 }
2034
2035 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2036 const struct cfg80211_chan_def *chandef,
2037 u16 prot_mode)
2038 {
2039 struct ieee80211_ht_operation *ht_oper;
2040 /* Build HT Information */
2041 *pos++ = WLAN_EID_HT_OPERATION;
2042 *pos++ = sizeof(struct ieee80211_ht_operation);
2043 ht_oper = (struct ieee80211_ht_operation *)pos;
2044 ht_oper->primary_chan = ieee80211_frequency_to_channel(
2045 chandef->chan->center_freq);
2046 switch (chandef->width) {
2047 case NL80211_CHAN_WIDTH_160:
2048 case NL80211_CHAN_WIDTH_80P80:
2049 case NL80211_CHAN_WIDTH_80:
2050 case NL80211_CHAN_WIDTH_40:
2051 if (chandef->center_freq1 > chandef->chan->center_freq)
2052 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2053 else
2054 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2055 break;
2056 default:
2057 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
2058 break;
2059 }
2060 if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
2061 chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
2062 chandef->width != NL80211_CHAN_WIDTH_20)
2063 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
2064
2065 ht_oper->operation_mode = cpu_to_le16(prot_mode);
2066 ht_oper->stbc_param = 0x0000;
2067
2068 /* It seems that Basic MCS set and Supported MCS set
2069 are identical for the first 10 bytes */
2070 memset(&ht_oper->basic_set, 0, 16);
2071 memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
2072
2073 return pos + sizeof(struct ieee80211_ht_operation);
2074 }
2075
2076 void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan,
2077 const struct ieee80211_ht_operation *ht_oper,
2078 struct cfg80211_chan_def *chandef)
2079 {
2080 enum nl80211_channel_type channel_type;
2081
2082 if (!ht_oper) {
2083 cfg80211_chandef_create(chandef, control_chan,
2084 NL80211_CHAN_NO_HT);
2085 return;
2086 }
2087
2088 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
2089 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
2090 channel_type = NL80211_CHAN_HT20;
2091 break;
2092 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
2093 channel_type = NL80211_CHAN_HT40PLUS;
2094 break;
2095 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
2096 channel_type = NL80211_CHAN_HT40MINUS;
2097 break;
2098 default:
2099 channel_type = NL80211_CHAN_NO_HT;
2100 }
2101
2102 cfg80211_chandef_create(chandef, control_chan, channel_type);
2103 }
2104
2105 int ieee80211_parse_bitrates(struct cfg80211_chan_def *chandef,
2106 const struct ieee80211_supported_band *sband,
2107 const u8 *srates, int srates_len, u32 *rates)
2108 {
2109 u32 rate_flags = ieee80211_chandef_rate_flags(chandef);
2110 int shift = ieee80211_chandef_get_shift(chandef);
2111 struct ieee80211_rate *br;
2112 int brate, rate, i, j, count = 0;
2113
2114 *rates = 0;
2115
2116 for (i = 0; i < srates_len; i++) {
2117 rate = srates[i] & 0x7f;
2118
2119 for (j = 0; j < sband->n_bitrates; j++) {
2120 br = &sband->bitrates[j];
2121 if ((rate_flags & br->flags) != rate_flags)
2122 continue;
2123
2124 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2125 if (brate == rate) {
2126 *rates |= BIT(j);
2127 count++;
2128 break;
2129 }
2130 }
2131 }
2132 return count;
2133 }
2134
2135 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
2136 struct sk_buff *skb, bool need_basic,
2137 enum ieee80211_band band)
2138 {
2139 struct ieee80211_local *local = sdata->local;
2140 struct ieee80211_supported_band *sband;
2141 int rate, shift;
2142 u8 i, rates, *pos;
2143 u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2144 u32 rate_flags;
2145
2146 shift = ieee80211_vif_get_shift(&sdata->vif);
2147 rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2148 sband = local->hw.wiphy->bands[band];
2149 rates = 0;
2150 for (i = 0; i < sband->n_bitrates; i++) {
2151 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2152 continue;
2153 rates++;
2154 }
2155 if (rates > 8)
2156 rates = 8;
2157
2158 if (skb_tailroom(skb) < rates + 2)
2159 return -ENOMEM;
2160
2161 pos = skb_put(skb, rates + 2);
2162 *pos++ = WLAN_EID_SUPP_RATES;
2163 *pos++ = rates;
2164 for (i = 0; i < rates; i++) {
2165 u8 basic = 0;
2166 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2167 continue;
2168
2169 if (need_basic && basic_rates & BIT(i))
2170 basic = 0x80;
2171 rate = sband->bitrates[i].bitrate;
2172 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2173 5 * (1 << shift));
2174 *pos++ = basic | (u8) rate;
2175 }
2176
2177 return 0;
2178 }
2179
2180 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2181 struct sk_buff *skb, bool need_basic,
2182 enum ieee80211_band band)
2183 {
2184 struct ieee80211_local *local = sdata->local;
2185 struct ieee80211_supported_band *sband;
2186 int rate, shift;
2187 u8 i, exrates, *pos;
2188 u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2189 u32 rate_flags;
2190
2191 rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2192 shift = ieee80211_vif_get_shift(&sdata->vif);
2193
2194 sband = local->hw.wiphy->bands[band];
2195 exrates = 0;
2196 for (i = 0; i < sband->n_bitrates; i++) {
2197 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2198 continue;
2199 exrates++;
2200 }
2201
2202 if (exrates > 8)
2203 exrates -= 8;
2204 else
2205 exrates = 0;
2206
2207 if (skb_tailroom(skb) < exrates + 2)
2208 return -ENOMEM;
2209
2210 if (exrates) {
2211 pos = skb_put(skb, exrates + 2);
2212 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2213 *pos++ = exrates;
2214 for (i = 8; i < sband->n_bitrates; i++) {
2215 u8 basic = 0;
2216 if ((rate_flags & sband->bitrates[i].flags)
2217 != rate_flags)
2218 continue;
2219 if (need_basic && basic_rates & BIT(i))
2220 basic = 0x80;
2221 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2222 5 * (1 << shift));
2223 *pos++ = basic | (u8) rate;
2224 }
2225 }
2226 return 0;
2227 }
2228
2229 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2230 {
2231 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2232 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2233
2234 if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2235 /* non-managed type inferfaces */
2236 return 0;
2237 }
2238 return ifmgd->ave_beacon_signal / 16;
2239 }
2240 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2241
2242 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2243 {
2244 if (!mcs)
2245 return 1;
2246
2247 /* TODO: consider rx_highest */
2248
2249 if (mcs->rx_mask[3])
2250 return 4;
2251 if (mcs->rx_mask[2])
2252 return 3;
2253 if (mcs->rx_mask[1])
2254 return 2;
2255 return 1;
2256 }
2257
2258 /**
2259 * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2260 * @local: mac80211 hw info struct
2261 * @status: RX status
2262 * @mpdu_len: total MPDU length (including FCS)
2263 * @mpdu_offset: offset into MPDU to calculate timestamp at
2264 *
2265 * This function calculates the RX timestamp at the given MPDU offset, taking
2266 * into account what the RX timestamp was. An offset of 0 will just normalize
2267 * the timestamp to TSF at beginning of MPDU reception.
2268 */
2269 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2270 struct ieee80211_rx_status *status,
2271 unsigned int mpdu_len,
2272 unsigned int mpdu_offset)
2273 {
2274 u64 ts = status->mactime;
2275 struct rate_info ri;
2276 u16 rate;
2277
2278 if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2279 return 0;
2280
2281 memset(&ri, 0, sizeof(ri));
2282
2283 /* Fill cfg80211 rate info */
2284 if (status->flag & RX_FLAG_HT) {
2285 ri.mcs = status->rate_idx;
2286 ri.flags |= RATE_INFO_FLAGS_MCS;
2287 if (status->flag & RX_FLAG_40MHZ)
2288 ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2289 if (status->flag & RX_FLAG_SHORT_GI)
2290 ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2291 } else if (status->flag & RX_FLAG_VHT) {
2292 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2293 ri.mcs = status->rate_idx;
2294 ri.nss = status->vht_nss;
2295 if (status->flag & RX_FLAG_40MHZ)
2296 ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2297 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
2298 ri.flags |= RATE_INFO_FLAGS_80_MHZ_WIDTH;
2299 if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
2300 ri.flags |= RATE_INFO_FLAGS_80P80_MHZ_WIDTH;
2301 if (status->vht_flag & RX_VHT_FLAG_160MHZ)
2302 ri.flags |= RATE_INFO_FLAGS_160_MHZ_WIDTH;
2303 if (status->flag & RX_FLAG_SHORT_GI)
2304 ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2305 } else {
2306 struct ieee80211_supported_band *sband;
2307 int shift = 0;
2308 int bitrate;
2309
2310 if (status->flag & RX_FLAG_10MHZ)
2311 shift = 1;
2312 if (status->flag & RX_FLAG_5MHZ)
2313 shift = 2;
2314
2315 sband = local->hw.wiphy->bands[status->band];
2316 bitrate = sband->bitrates[status->rate_idx].bitrate;
2317 ri.legacy = DIV_ROUND_UP(bitrate, (1 << shift));
2318 }
2319
2320 rate = cfg80211_calculate_bitrate(&ri);
2321 if (WARN_ONCE(!rate,
2322 "Invalid bitrate: flags=0x%x, idx=%d, vht_nss=%d\n",
2323 status->flag, status->rate_idx, status->vht_nss))
2324 return 0;
2325
2326 /* rewind from end of MPDU */
2327 if (status->flag & RX_FLAG_MACTIME_END)
2328 ts -= mpdu_len * 8 * 10 / rate;
2329
2330 ts += mpdu_offset * 8 * 10 / rate;
2331
2332 return ts;
2333 }
2334
2335 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2336 {
2337 struct ieee80211_sub_if_data *sdata;
2338 struct cfg80211_chan_def chandef;
2339
2340 mutex_lock(&local->mtx);
2341 mutex_lock(&local->iflist_mtx);
2342 list_for_each_entry(sdata, &local->interfaces, list) {
2343 /* it might be waiting for the local->mtx, but then
2344 * by the time it gets it, sdata->wdev.cac_started
2345 * will no longer be true
2346 */
2347 cancel_delayed_work(&sdata->dfs_cac_timer_work);
2348
2349 if (sdata->wdev.cac_started) {
2350 chandef = sdata->vif.bss_conf.chandef;
2351 ieee80211_vif_release_channel(sdata);
2352 cfg80211_cac_event(sdata->dev,
2353 &chandef,
2354 NL80211_RADAR_CAC_ABORTED,
2355 GFP_KERNEL);
2356 }
2357 }
2358 mutex_unlock(&local->iflist_mtx);
2359 mutex_unlock(&local->mtx);
2360 }
2361
2362 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2363 {
2364 struct ieee80211_local *local =
2365 container_of(work, struct ieee80211_local, radar_detected_work);
2366 struct cfg80211_chan_def chandef = local->hw.conf.chandef;
2367
2368 ieee80211_dfs_cac_cancel(local);
2369
2370 if (local->use_chanctx)
2371 /* currently not handled */
2372 WARN_ON(1);
2373 else
2374 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
2375 }
2376
2377 void ieee80211_radar_detected(struct ieee80211_hw *hw)
2378 {
2379 struct ieee80211_local *local = hw_to_local(hw);
2380
2381 trace_api_radar_detected(local);
2382
2383 ieee80211_queue_work(hw, &local->radar_detected_work);
2384 }
2385 EXPORT_SYMBOL(ieee80211_radar_detected);
2386
2387 u32 ieee80211_chandef_downgrade(struct cfg80211_chan_def *c)
2388 {
2389 u32 ret;
2390 int tmp;
2391
2392 switch (c->width) {
2393 case NL80211_CHAN_WIDTH_20:
2394 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2395 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2396 break;
2397 case NL80211_CHAN_WIDTH_40:
2398 c->width = NL80211_CHAN_WIDTH_20;
2399 c->center_freq1 = c->chan->center_freq;
2400 ret = IEEE80211_STA_DISABLE_40MHZ |
2401 IEEE80211_STA_DISABLE_VHT;
2402 break;
2403 case NL80211_CHAN_WIDTH_80:
2404 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
2405 /* n_P40 */
2406 tmp /= 2;
2407 /* freq_P40 */
2408 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
2409 c->width = NL80211_CHAN_WIDTH_40;
2410 ret = IEEE80211_STA_DISABLE_VHT;
2411 break;
2412 case NL80211_CHAN_WIDTH_80P80:
2413 c->center_freq2 = 0;
2414 c->width = NL80211_CHAN_WIDTH_80;
2415 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2416 IEEE80211_STA_DISABLE_160MHZ;
2417 break;
2418 case NL80211_CHAN_WIDTH_160:
2419 /* n_P20 */
2420 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
2421 /* n_P80 */
2422 tmp /= 4;
2423 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
2424 c->width = NL80211_CHAN_WIDTH_80;
2425 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2426 IEEE80211_STA_DISABLE_160MHZ;
2427 break;
2428 default:
2429 case NL80211_CHAN_WIDTH_20_NOHT:
2430 WARN_ON_ONCE(1);
2431 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2432 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2433 break;
2434 case NL80211_CHAN_WIDTH_5:
2435 case NL80211_CHAN_WIDTH_10:
2436 WARN_ON_ONCE(1);
2437 /* keep c->width */
2438 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2439 break;
2440 }
2441
2442 WARN_ON_ONCE(!cfg80211_chandef_valid(c));
2443
2444 return ret;
2445 }
2446
2447 /*
2448 * Returns true if smps_mode_new is strictly more restrictive than
2449 * smps_mode_old.
2450 */
2451 bool ieee80211_smps_is_restrictive(enum ieee80211_smps_mode smps_mode_old,
2452 enum ieee80211_smps_mode smps_mode_new)
2453 {
2454 if (WARN_ON_ONCE(smps_mode_old == IEEE80211_SMPS_AUTOMATIC ||
2455 smps_mode_new == IEEE80211_SMPS_AUTOMATIC))
2456 return false;
2457
2458 switch (smps_mode_old) {
2459 case IEEE80211_SMPS_STATIC:
2460 return false;
2461 case IEEE80211_SMPS_DYNAMIC:
2462 return smps_mode_new == IEEE80211_SMPS_STATIC;
2463 case IEEE80211_SMPS_OFF:
2464 return smps_mode_new != IEEE80211_SMPS_OFF;
2465 default:
2466 WARN_ON(1);
2467 }
2468
2469 return false;
2470 }
2471
2472 int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
2473 struct cfg80211_csa_settings *csa_settings)
2474 {
2475 struct sk_buff *skb;
2476 struct ieee80211_mgmt *mgmt;
2477 struct ieee80211_local *local = sdata->local;
2478 int freq;
2479 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.chan_switch) +
2480 sizeof(mgmt->u.action.u.chan_switch);
2481 u8 *pos;
2482
2483 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2484 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2485 return -EOPNOTSUPP;
2486
2487 skb = dev_alloc_skb(local->tx_headroom + hdr_len +
2488 5 + /* channel switch announcement element */
2489 3 + /* secondary channel offset element */
2490 8); /* mesh channel switch parameters element */
2491 if (!skb)
2492 return -ENOMEM;
2493
2494 skb_reserve(skb, local->tx_headroom);
2495 mgmt = (struct ieee80211_mgmt *)skb_put(skb, hdr_len);
2496 memset(mgmt, 0, hdr_len);
2497 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2498 IEEE80211_STYPE_ACTION);
2499
2500 eth_broadcast_addr(mgmt->da);
2501 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2502 if (ieee80211_vif_is_mesh(&sdata->vif)) {
2503 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2504 } else {
2505 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2506 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
2507 }
2508 mgmt->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
2509 mgmt->u.action.u.chan_switch.action_code = WLAN_ACTION_SPCT_CHL_SWITCH;
2510 pos = skb_put(skb, 5);
2511 *pos++ = WLAN_EID_CHANNEL_SWITCH; /* EID */
2512 *pos++ = 3; /* IE length */
2513 *pos++ = csa_settings->block_tx ? 1 : 0; /* CSA mode */
2514 freq = csa_settings->chandef.chan->center_freq;
2515 *pos++ = ieee80211_frequency_to_channel(freq); /* channel */
2516 *pos++ = csa_settings->count; /* count */
2517
2518 if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_40) {
2519 enum nl80211_channel_type ch_type;
2520
2521 skb_put(skb, 3);
2522 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
2523 *pos++ = 1; /* IE length */
2524 ch_type = cfg80211_get_chandef_type(&csa_settings->chandef);
2525 if (ch_type == NL80211_CHAN_HT40PLUS)
2526 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2527 else
2528 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2529 }
2530
2531 if (ieee80211_vif_is_mesh(&sdata->vif)) {
2532 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2533
2534 skb_put(skb, 8);
2535 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM; /* EID */
2536 *pos++ = 6; /* IE length */
2537 *pos++ = sdata->u.mesh.mshcfg.dot11MeshTTL; /* Mesh TTL */
2538 *pos = 0x00; /* Mesh Flag: Tx Restrict, Initiator, Reason */
2539 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
2540 *pos++ |= csa_settings->block_tx ?
2541 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
2542 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); /* Reason Cd */
2543 pos += 2;
2544 put_unaligned_le16(ifmsh->pre_value, pos);/* Precedence Value */
2545 pos += 2;
2546 }
2547
2548 ieee80211_tx_skb(sdata, skb);
2549 return 0;
2550 }
2551
2552 bool ieee80211_cs_valid(const struct ieee80211_cipher_scheme *cs)
2553 {
2554 return !(cs == NULL || cs->cipher == 0 ||
2555 cs->hdr_len < cs->pn_len + cs->pn_off ||
2556 cs->hdr_len <= cs->key_idx_off ||
2557 cs->key_idx_shift > 7 ||
2558 cs->key_idx_mask == 0);
2559 }
2560
2561 bool ieee80211_cs_list_valid(const struct ieee80211_cipher_scheme *cs, int n)
2562 {
2563 int i;
2564
2565 /* Ensure we have enough iftype bitmap space for all iftype values */
2566 WARN_ON((NUM_NL80211_IFTYPES / 8 + 1) > sizeof(cs[0].iftype));
2567
2568 for (i = 0; i < n; i++)
2569 if (!ieee80211_cs_valid(&cs[i]))
2570 return false;
2571
2572 return true;
2573 }
2574
2575 const struct ieee80211_cipher_scheme *
2576 ieee80211_cs_get(struct ieee80211_local *local, u32 cipher,
2577 enum nl80211_iftype iftype)
2578 {
2579 const struct ieee80211_cipher_scheme *l = local->hw.cipher_schemes;
2580 int n = local->hw.n_cipher_schemes;
2581 int i;
2582 const struct ieee80211_cipher_scheme *cs = NULL;
2583
2584 for (i = 0; i < n; i++) {
2585 if (l[i].cipher == cipher) {
2586 cs = &l[i];
2587 break;
2588 }
2589 }
2590
2591 if (!cs || !(cs->iftype & BIT(iftype)))
2592 return NULL;
2593
2594 return cs;
2595 }
2596
2597 int ieee80211_cs_headroom(struct ieee80211_local *local,
2598 struct cfg80211_crypto_settings *crypto,
2599 enum nl80211_iftype iftype)
2600 {
2601 const struct ieee80211_cipher_scheme *cs;
2602 int headroom = IEEE80211_ENCRYPT_HEADROOM;
2603 int i;
2604
2605 for (i = 0; i < crypto->n_ciphers_pairwise; i++) {
2606 cs = ieee80211_cs_get(local, crypto->ciphers_pairwise[i],
2607 iftype);
2608
2609 if (cs && headroom < cs->hdr_len)
2610 headroom = cs->hdr_len;
2611 }
2612
2613 cs = ieee80211_cs_get(local, crypto->cipher_group, iftype);
2614 if (cs && headroom < cs->hdr_len)
2615 headroom = cs->hdr_len;
2616
2617 return headroom;
2618 }
2619
2620 static bool
2621 ieee80211_extend_noa_desc(struct ieee80211_noa_data *data, u32 tsf, int i)
2622 {
2623 s32 end = data->desc[i].start + data->desc[i].duration - (tsf + 1);
2624 int skip;
2625
2626 if (end > 0)
2627 return false;
2628
2629 /* End time is in the past, check for repetitions */
2630 skip = DIV_ROUND_UP(-end, data->desc[i].interval);
2631 if (data->count[i] < 255) {
2632 if (data->count[i] <= skip) {
2633 data->count[i] = 0;
2634 return false;
2635 }
2636
2637 data->count[i] -= skip;
2638 }
2639
2640 data->desc[i].start += skip * data->desc[i].interval;
2641
2642 return true;
2643 }
2644
2645 static bool
2646 ieee80211_extend_absent_time(struct ieee80211_noa_data *data, u32 tsf,
2647 s32 *offset)
2648 {
2649 bool ret = false;
2650 int i;
2651
2652 for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2653 s32 cur;
2654
2655 if (!data->count[i])
2656 continue;
2657
2658 if (ieee80211_extend_noa_desc(data, tsf + *offset, i))
2659 ret = true;
2660
2661 cur = data->desc[i].start - tsf;
2662 if (cur > *offset)
2663 continue;
2664
2665 cur = data->desc[i].start + data->desc[i].duration - tsf;
2666 if (cur > *offset)
2667 *offset = cur;
2668 }
2669
2670 return ret;
2671 }
2672
2673 static u32
2674 ieee80211_get_noa_absent_time(struct ieee80211_noa_data *data, u32 tsf)
2675 {
2676 s32 offset = 0;
2677 int tries = 0;
2678 /*
2679 * arbitrary limit, used to avoid infinite loops when combined NoA
2680 * descriptors cover the full time period.
2681 */
2682 int max_tries = 5;
2683
2684 ieee80211_extend_absent_time(data, tsf, &offset);
2685 do {
2686 if (!ieee80211_extend_absent_time(data, tsf, &offset))
2687 break;
2688
2689 tries++;
2690 } while (tries < max_tries);
2691
2692 return offset;
2693 }
2694
2695 void ieee80211_update_p2p_noa(struct ieee80211_noa_data *data, u32 tsf)
2696 {
2697 u32 next_offset = BIT(31) - 1;
2698 int i;
2699
2700 data->absent = 0;
2701 data->has_next_tsf = false;
2702 for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2703 s32 start;
2704
2705 if (!data->count[i])
2706 continue;
2707
2708 ieee80211_extend_noa_desc(data, tsf, i);
2709 start = data->desc[i].start - tsf;
2710 if (start <= 0)
2711 data->absent |= BIT(i);
2712
2713 if (next_offset > start)
2714 next_offset = start;
2715
2716 data->has_next_tsf = true;
2717 }
2718
2719 if (data->absent)
2720 next_offset = ieee80211_get_noa_absent_time(data, tsf);
2721
2722 data->next_tsf = tsf + next_offset;
2723 }
2724 EXPORT_SYMBOL(ieee80211_update_p2p_noa);
2725
2726 int ieee80211_parse_p2p_noa(const struct ieee80211_p2p_noa_attr *attr,
2727 struct ieee80211_noa_data *data, u32 tsf)
2728 {
2729 int ret = 0;
2730 int i;
2731
2732 memset(data, 0, sizeof(*data));
2733
2734 for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2735 const struct ieee80211_p2p_noa_desc *desc = &attr->desc[i];
2736
2737 if (!desc->count || !desc->duration)
2738 continue;
2739
2740 data->count[i] = desc->count;
2741 data->desc[i].start = le32_to_cpu(desc->start_time);
2742 data->desc[i].duration = le32_to_cpu(desc->duration);
2743 data->desc[i].interval = le32_to_cpu(desc->interval);
2744
2745 if (data->count[i] > 1 &&
2746 data->desc[i].interval < data->desc[i].duration)
2747 continue;
2748
2749 ieee80211_extend_noa_desc(data, tsf, i);
2750 ret++;
2751 }
2752
2753 if (ret)
2754 ieee80211_update_p2p_noa(data, tsf);
2755
2756 return ret;
2757 }
2758 EXPORT_SYMBOL(ieee80211_parse_p2p_noa);
2759
2760 void ieee80211_recalc_dtim(struct ieee80211_local *local,
2761 struct ieee80211_sub_if_data *sdata)
2762 {
2763 u64 tsf = drv_get_tsf(local, sdata);
2764 u64 dtim_count = 0;
2765 u16 beacon_int = sdata->vif.bss_conf.beacon_int * 1024;
2766 u8 dtim_period = sdata->vif.bss_conf.dtim_period;
2767 struct ps_data *ps;
2768 u8 bcns_from_dtim;
2769
2770 if (tsf == -1ULL || !beacon_int || !dtim_period)
2771 return;
2772
2773 if (sdata->vif.type == NL80211_IFTYPE_AP ||
2774 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
2775 if (!sdata->bss)
2776 return;
2777
2778 ps = &sdata->bss->ps;
2779 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2780 ps = &sdata->u.mesh.ps;
2781 } else {
2782 return;
2783 }
2784
2785 /*
2786 * actually finds last dtim_count, mac80211 will update in
2787 * __beacon_add_tim().
2788 * dtim_count = dtim_period - (tsf / bcn_int) % dtim_period
2789 */
2790 do_div(tsf, beacon_int);
2791 bcns_from_dtim = do_div(tsf, dtim_period);
2792 /* just had a DTIM */
2793 if (!bcns_from_dtim)
2794 dtim_count = 0;
2795 else
2796 dtim_count = dtim_period - bcns_from_dtim;
2797
2798 ps->dtim_count = dtim_count;
2799 }
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