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Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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 struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev)
697 {
698 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
699
700 if (!ieee80211_sdata_running(sdata) ||
701 !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
702 return NULL;
703 return &sdata->vif;
704 }
705 EXPORT_SYMBOL_GPL(wdev_to_ieee80211_vif);
706
707 /*
708 * Nothing should have been stuffed into the workqueue during
709 * the suspend->resume cycle. If this WARN is seen then there
710 * is a bug with either the driver suspend or something in
711 * mac80211 stuffing into the workqueue which we haven't yet
712 * cleared during mac80211's suspend cycle.
713 */
714 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
715 {
716 if (WARN(local->suspended && !local->resuming,
717 "queueing ieee80211 work while going to suspend\n"))
718 return false;
719
720 return true;
721 }
722
723 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
724 {
725 struct ieee80211_local *local = hw_to_local(hw);
726
727 if (!ieee80211_can_queue_work(local))
728 return;
729
730 queue_work(local->workqueue, work);
731 }
732 EXPORT_SYMBOL(ieee80211_queue_work);
733
734 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
735 struct delayed_work *dwork,
736 unsigned long delay)
737 {
738 struct ieee80211_local *local = hw_to_local(hw);
739
740 if (!ieee80211_can_queue_work(local))
741 return;
742
743 queue_delayed_work(local->workqueue, dwork, delay);
744 }
745 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
746
747 u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
748 struct ieee802_11_elems *elems,
749 u64 filter, u32 crc)
750 {
751 size_t left = len;
752 const u8 *pos = start;
753 bool calc_crc = filter != 0;
754 DECLARE_BITMAP(seen_elems, 256);
755 const u8 *ie;
756
757 bitmap_zero(seen_elems, 256);
758 memset(elems, 0, sizeof(*elems));
759 elems->ie_start = start;
760 elems->total_len = len;
761
762 while (left >= 2) {
763 u8 id, elen;
764 bool elem_parse_failed;
765
766 id = *pos++;
767 elen = *pos++;
768 left -= 2;
769
770 if (elen > left) {
771 elems->parse_error = true;
772 break;
773 }
774
775 switch (id) {
776 case WLAN_EID_SSID:
777 case WLAN_EID_SUPP_RATES:
778 case WLAN_EID_FH_PARAMS:
779 case WLAN_EID_DS_PARAMS:
780 case WLAN_EID_CF_PARAMS:
781 case WLAN_EID_TIM:
782 case WLAN_EID_IBSS_PARAMS:
783 case WLAN_EID_CHALLENGE:
784 case WLAN_EID_RSN:
785 case WLAN_EID_ERP_INFO:
786 case WLAN_EID_EXT_SUPP_RATES:
787 case WLAN_EID_HT_CAPABILITY:
788 case WLAN_EID_HT_OPERATION:
789 case WLAN_EID_VHT_CAPABILITY:
790 case WLAN_EID_VHT_OPERATION:
791 case WLAN_EID_MESH_ID:
792 case WLAN_EID_MESH_CONFIG:
793 case WLAN_EID_PEER_MGMT:
794 case WLAN_EID_PREQ:
795 case WLAN_EID_PREP:
796 case WLAN_EID_PERR:
797 case WLAN_EID_RANN:
798 case WLAN_EID_CHANNEL_SWITCH:
799 case WLAN_EID_EXT_CHANSWITCH_ANN:
800 case WLAN_EID_COUNTRY:
801 case WLAN_EID_PWR_CONSTRAINT:
802 case WLAN_EID_TIMEOUT_INTERVAL:
803 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
804 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
805 case WLAN_EID_CHAN_SWITCH_PARAM:
806 /*
807 * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
808 * that if the content gets bigger it might be needed more than once
809 */
810 if (test_bit(id, seen_elems)) {
811 elems->parse_error = true;
812 left -= elen;
813 pos += elen;
814 continue;
815 }
816 break;
817 }
818
819 if (calc_crc && id < 64 && (filter & (1ULL << id)))
820 crc = crc32_be(crc, pos - 2, elen + 2);
821
822 elem_parse_failed = false;
823
824 switch (id) {
825 case WLAN_EID_SSID:
826 elems->ssid = pos;
827 elems->ssid_len = elen;
828 break;
829 case WLAN_EID_SUPP_RATES:
830 elems->supp_rates = pos;
831 elems->supp_rates_len = elen;
832 break;
833 case WLAN_EID_DS_PARAMS:
834 if (elen >= 1)
835 elems->ds_params = pos;
836 else
837 elem_parse_failed = true;
838 break;
839 case WLAN_EID_TIM:
840 if (elen >= sizeof(struct ieee80211_tim_ie)) {
841 elems->tim = (void *)pos;
842 elems->tim_len = elen;
843 } else
844 elem_parse_failed = true;
845 break;
846 case WLAN_EID_CHALLENGE:
847 elems->challenge = pos;
848 elems->challenge_len = elen;
849 break;
850 case WLAN_EID_VENDOR_SPECIFIC:
851 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
852 pos[2] == 0xf2) {
853 /* Microsoft OUI (00:50:F2) */
854
855 if (calc_crc)
856 crc = crc32_be(crc, pos - 2, elen + 2);
857
858 if (elen >= 5 && pos[3] == 2) {
859 /* OUI Type 2 - WMM IE */
860 if (pos[4] == 0) {
861 elems->wmm_info = pos;
862 elems->wmm_info_len = elen;
863 } else if (pos[4] == 1) {
864 elems->wmm_param = pos;
865 elems->wmm_param_len = elen;
866 }
867 }
868 }
869 break;
870 case WLAN_EID_RSN:
871 elems->rsn = pos;
872 elems->rsn_len = elen;
873 break;
874 case WLAN_EID_ERP_INFO:
875 if (elen >= 1)
876 elems->erp_info = pos;
877 else
878 elem_parse_failed = true;
879 break;
880 case WLAN_EID_EXT_SUPP_RATES:
881 elems->ext_supp_rates = pos;
882 elems->ext_supp_rates_len = elen;
883 break;
884 case WLAN_EID_HT_CAPABILITY:
885 if (elen >= sizeof(struct ieee80211_ht_cap))
886 elems->ht_cap_elem = (void *)pos;
887 else
888 elem_parse_failed = true;
889 break;
890 case WLAN_EID_HT_OPERATION:
891 if (elen >= sizeof(struct ieee80211_ht_operation))
892 elems->ht_operation = (void *)pos;
893 else
894 elem_parse_failed = true;
895 break;
896 case WLAN_EID_VHT_CAPABILITY:
897 if (elen >= sizeof(struct ieee80211_vht_cap))
898 elems->vht_cap_elem = (void *)pos;
899 else
900 elem_parse_failed = true;
901 break;
902 case WLAN_EID_VHT_OPERATION:
903 if (elen >= sizeof(struct ieee80211_vht_operation))
904 elems->vht_operation = (void *)pos;
905 else
906 elem_parse_failed = true;
907 break;
908 case WLAN_EID_OPMODE_NOTIF:
909 if (elen > 0)
910 elems->opmode_notif = pos;
911 else
912 elem_parse_failed = true;
913 break;
914 case WLAN_EID_MESH_ID:
915 elems->mesh_id = pos;
916 elems->mesh_id_len = elen;
917 break;
918 case WLAN_EID_MESH_CONFIG:
919 if (elen >= sizeof(struct ieee80211_meshconf_ie))
920 elems->mesh_config = (void *)pos;
921 else
922 elem_parse_failed = true;
923 break;
924 case WLAN_EID_PEER_MGMT:
925 elems->peering = pos;
926 elems->peering_len = elen;
927 break;
928 case WLAN_EID_MESH_AWAKE_WINDOW:
929 if (elen >= 2)
930 elems->awake_window = (void *)pos;
931 break;
932 case WLAN_EID_PREQ:
933 elems->preq = pos;
934 elems->preq_len = elen;
935 break;
936 case WLAN_EID_PREP:
937 elems->prep = pos;
938 elems->prep_len = elen;
939 break;
940 case WLAN_EID_PERR:
941 elems->perr = pos;
942 elems->perr_len = elen;
943 break;
944 case WLAN_EID_RANN:
945 if (elen >= sizeof(struct ieee80211_rann_ie))
946 elems->rann = (void *)pos;
947 else
948 elem_parse_failed = true;
949 break;
950 case WLAN_EID_CHANNEL_SWITCH:
951 if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
952 elem_parse_failed = true;
953 break;
954 }
955 elems->ch_switch_ie = (void *)pos;
956 break;
957 case WLAN_EID_EXT_CHANSWITCH_ANN:
958 if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
959 elem_parse_failed = true;
960 break;
961 }
962 elems->ext_chansw_ie = (void *)pos;
963 break;
964 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
965 if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
966 elem_parse_failed = true;
967 break;
968 }
969 elems->sec_chan_offs = (void *)pos;
970 break;
971 case WLAN_EID_CHAN_SWITCH_PARAM:
972 if (elen !=
973 sizeof(*elems->mesh_chansw_params_ie)) {
974 elem_parse_failed = true;
975 break;
976 }
977 elems->mesh_chansw_params_ie = (void *)pos;
978 break;
979 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
980 if (!action ||
981 elen != sizeof(*elems->wide_bw_chansw_ie)) {
982 elem_parse_failed = true;
983 break;
984 }
985 elems->wide_bw_chansw_ie = (void *)pos;
986 break;
987 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
988 if (action) {
989 elem_parse_failed = true;
990 break;
991 }
992 /*
993 * This is a bit tricky, but as we only care about
994 * the wide bandwidth channel switch element, so
995 * just parse it out manually.
996 */
997 ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
998 pos, elen);
999 if (ie) {
1000 if (ie[1] == sizeof(*elems->wide_bw_chansw_ie))
1001 elems->wide_bw_chansw_ie =
1002 (void *)(ie + 2);
1003 else
1004 elem_parse_failed = true;
1005 }
1006 break;
1007 case WLAN_EID_COUNTRY:
1008 elems->country_elem = pos;
1009 elems->country_elem_len = elen;
1010 break;
1011 case WLAN_EID_PWR_CONSTRAINT:
1012 if (elen != 1) {
1013 elem_parse_failed = true;
1014 break;
1015 }
1016 elems->pwr_constr_elem = pos;
1017 break;
1018 case WLAN_EID_CISCO_VENDOR_SPECIFIC:
1019 /* Lots of different options exist, but we only care
1020 * about the Dynamic Transmit Power Control element.
1021 * First check for the Cisco OUI, then for the DTPC
1022 * tag (0x00).
1023 */
1024 if (elen < 4) {
1025 elem_parse_failed = true;
1026 break;
1027 }
1028
1029 if (pos[0] != 0x00 || pos[1] != 0x40 ||
1030 pos[2] != 0x96 || pos[3] != 0x00)
1031 break;
1032
1033 if (elen != 6) {
1034 elem_parse_failed = true;
1035 break;
1036 }
1037
1038 if (calc_crc)
1039 crc = crc32_be(crc, pos - 2, elen + 2);
1040
1041 elems->cisco_dtpc_elem = pos;
1042 break;
1043 case WLAN_EID_TIMEOUT_INTERVAL:
1044 if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
1045 elems->timeout_int = (void *)pos;
1046 else
1047 elem_parse_failed = true;
1048 break;
1049 default:
1050 break;
1051 }
1052
1053 if (elem_parse_failed)
1054 elems->parse_error = true;
1055 else
1056 __set_bit(id, seen_elems);
1057
1058 left -= elen;
1059 pos += elen;
1060 }
1061
1062 if (left != 0)
1063 elems->parse_error = true;
1064
1065 return crc;
1066 }
1067
1068 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
1069 bool bss_notify)
1070 {
1071 struct ieee80211_local *local = sdata->local;
1072 struct ieee80211_tx_queue_params qparam;
1073 struct ieee80211_chanctx_conf *chanctx_conf;
1074 int ac;
1075 bool use_11b, enable_qos;
1076 int aCWmin, aCWmax;
1077
1078 if (!local->ops->conf_tx)
1079 return;
1080
1081 if (local->hw.queues < IEEE80211_NUM_ACS)
1082 return;
1083
1084 memset(&qparam, 0, sizeof(qparam));
1085
1086 rcu_read_lock();
1087 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1088 use_11b = (chanctx_conf &&
1089 chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) &&
1090 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
1091 rcu_read_unlock();
1092
1093 /*
1094 * By default disable QoS in STA mode for old access points, which do
1095 * not support 802.11e. New APs will provide proper queue parameters,
1096 * that we will configure later.
1097 */
1098 enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
1099
1100 /* Set defaults according to 802.11-2007 Table 7-37 */
1101 aCWmax = 1023;
1102 if (use_11b)
1103 aCWmin = 31;
1104 else
1105 aCWmin = 15;
1106
1107 /* Confiure old 802.11b/g medium access rules. */
1108 qparam.cw_max = aCWmax;
1109 qparam.cw_min = aCWmin;
1110 qparam.txop = 0;
1111 qparam.aifs = 2;
1112
1113 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1114 /* Update if QoS is enabled. */
1115 if (enable_qos) {
1116 switch (ac) {
1117 case IEEE80211_AC_BK:
1118 qparam.cw_max = aCWmax;
1119 qparam.cw_min = aCWmin;
1120 qparam.txop = 0;
1121 qparam.aifs = 7;
1122 break;
1123 /* never happens but let's not leave undefined */
1124 default:
1125 case IEEE80211_AC_BE:
1126 qparam.cw_max = aCWmax;
1127 qparam.cw_min = aCWmin;
1128 qparam.txop = 0;
1129 qparam.aifs = 3;
1130 break;
1131 case IEEE80211_AC_VI:
1132 qparam.cw_max = aCWmin;
1133 qparam.cw_min = (aCWmin + 1) / 2 - 1;
1134 if (use_11b)
1135 qparam.txop = 6016/32;
1136 else
1137 qparam.txop = 3008/32;
1138 qparam.aifs = 2;
1139 break;
1140 case IEEE80211_AC_VO:
1141 qparam.cw_max = (aCWmin + 1) / 2 - 1;
1142 qparam.cw_min = (aCWmin + 1) / 4 - 1;
1143 if (use_11b)
1144 qparam.txop = 3264/32;
1145 else
1146 qparam.txop = 1504/32;
1147 qparam.aifs = 2;
1148 break;
1149 }
1150 }
1151
1152 qparam.uapsd = false;
1153
1154 sdata->tx_conf[ac] = qparam;
1155 drv_conf_tx(local, sdata, ac, &qparam);
1156 }
1157
1158 if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1159 sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
1160 sdata->vif.bss_conf.qos = enable_qos;
1161 if (bss_notify)
1162 ieee80211_bss_info_change_notify(sdata,
1163 BSS_CHANGED_QOS);
1164 }
1165 }
1166
1167 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1168 u16 transaction, u16 auth_alg, u16 status,
1169 const u8 *extra, size_t extra_len, const u8 *da,
1170 const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1171 u32 tx_flags)
1172 {
1173 struct ieee80211_local *local = sdata->local;
1174 struct sk_buff *skb;
1175 struct ieee80211_mgmt *mgmt;
1176 int err;
1177
1178 /* 24 + 6 = header + auth_algo + auth_transaction + status_code */
1179 skb = dev_alloc_skb(local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN +
1180 24 + 6 + extra_len + IEEE80211_WEP_ICV_LEN);
1181 if (!skb)
1182 return;
1183
1184 skb_reserve(skb, local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN);
1185
1186 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1187 memset(mgmt, 0, 24 + 6);
1188 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1189 IEEE80211_STYPE_AUTH);
1190 memcpy(mgmt->da, da, ETH_ALEN);
1191 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1192 memcpy(mgmt->bssid, bssid, ETH_ALEN);
1193 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1194 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1195 mgmt->u.auth.status_code = cpu_to_le16(status);
1196 if (extra)
1197 memcpy(skb_put(skb, extra_len), extra, extra_len);
1198
1199 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1200 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1201 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1202 WARN_ON(err);
1203 }
1204
1205 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1206 tx_flags;
1207 ieee80211_tx_skb(sdata, skb);
1208 }
1209
1210 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1211 const u8 *bssid, u16 stype, u16 reason,
1212 bool send_frame, u8 *frame_buf)
1213 {
1214 struct ieee80211_local *local = sdata->local;
1215 struct sk_buff *skb;
1216 struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1217
1218 /* build frame */
1219 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1220 mgmt->duration = 0; /* initialize only */
1221 mgmt->seq_ctrl = 0; /* initialize only */
1222 memcpy(mgmt->da, bssid, ETH_ALEN);
1223 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1224 memcpy(mgmt->bssid, bssid, ETH_ALEN);
1225 /* u.deauth.reason_code == u.disassoc.reason_code */
1226 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1227
1228 if (send_frame) {
1229 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1230 IEEE80211_DEAUTH_FRAME_LEN);
1231 if (!skb)
1232 return;
1233
1234 skb_reserve(skb, local->hw.extra_tx_headroom);
1235
1236 /* copy in frame */
1237 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1238 mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1239
1240 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1241 !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1242 IEEE80211_SKB_CB(skb)->flags |=
1243 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1244
1245 ieee80211_tx_skb(sdata, skb);
1246 }
1247 }
1248
1249 static int ieee80211_build_preq_ies_band(struct ieee80211_local *local,
1250 u8 *buffer, size_t buffer_len,
1251 const u8 *ie, size_t ie_len,
1252 enum ieee80211_band band,
1253 u32 rate_mask,
1254 struct cfg80211_chan_def *chandef,
1255 size_t *offset)
1256 {
1257 struct ieee80211_supported_band *sband;
1258 u8 *pos = buffer, *end = buffer + buffer_len;
1259 size_t noffset;
1260 int supp_rates_len, i;
1261 u8 rates[32];
1262 int num_rates;
1263 int ext_rates_len;
1264 int shift;
1265 u32 rate_flags;
1266
1267 *offset = 0;
1268
1269 sband = local->hw.wiphy->bands[band];
1270 if (WARN_ON_ONCE(!sband))
1271 return 0;
1272
1273 rate_flags = ieee80211_chandef_rate_flags(chandef);
1274 shift = ieee80211_chandef_get_shift(chandef);
1275
1276 num_rates = 0;
1277 for (i = 0; i < sband->n_bitrates; i++) {
1278 if ((BIT(i) & rate_mask) == 0)
1279 continue; /* skip rate */
1280 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1281 continue;
1282
1283 rates[num_rates++] =
1284 (u8) DIV_ROUND_UP(sband->bitrates[i].bitrate,
1285 (1 << shift) * 5);
1286 }
1287
1288 supp_rates_len = min_t(int, num_rates, 8);
1289
1290 if (end - pos < 2 + supp_rates_len)
1291 goto out_err;
1292 *pos++ = WLAN_EID_SUPP_RATES;
1293 *pos++ = supp_rates_len;
1294 memcpy(pos, rates, supp_rates_len);
1295 pos += supp_rates_len;
1296
1297 /* insert "request information" if in custom IEs */
1298 if (ie && ie_len) {
1299 static const u8 before_extrates[] = {
1300 WLAN_EID_SSID,
1301 WLAN_EID_SUPP_RATES,
1302 WLAN_EID_REQUEST,
1303 };
1304 noffset = ieee80211_ie_split(ie, ie_len,
1305 before_extrates,
1306 ARRAY_SIZE(before_extrates),
1307 *offset);
1308 if (end - pos < noffset - *offset)
1309 goto out_err;
1310 memcpy(pos, ie + *offset, noffset - *offset);
1311 pos += noffset - *offset;
1312 *offset = noffset;
1313 }
1314
1315 ext_rates_len = num_rates - supp_rates_len;
1316 if (ext_rates_len > 0) {
1317 if (end - pos < 2 + ext_rates_len)
1318 goto out_err;
1319 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1320 *pos++ = ext_rates_len;
1321 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1322 pos += ext_rates_len;
1323 }
1324
1325 if (chandef->chan && sband->band == IEEE80211_BAND_2GHZ) {
1326 if (end - pos < 3)
1327 goto out_err;
1328 *pos++ = WLAN_EID_DS_PARAMS;
1329 *pos++ = 1;
1330 *pos++ = ieee80211_frequency_to_channel(
1331 chandef->chan->center_freq);
1332 }
1333
1334 /* insert custom IEs that go before HT */
1335 if (ie && ie_len) {
1336 static const u8 before_ht[] = {
1337 WLAN_EID_SSID,
1338 WLAN_EID_SUPP_RATES,
1339 WLAN_EID_REQUEST,
1340 WLAN_EID_EXT_SUPP_RATES,
1341 WLAN_EID_DS_PARAMS,
1342 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1343 };
1344 noffset = ieee80211_ie_split(ie, ie_len,
1345 before_ht, ARRAY_SIZE(before_ht),
1346 *offset);
1347 if (end - pos < noffset - *offset)
1348 goto out_err;
1349 memcpy(pos, ie + *offset, noffset - *offset);
1350 pos += noffset - *offset;
1351 *offset = noffset;
1352 }
1353
1354 if (sband->ht_cap.ht_supported) {
1355 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1356 goto out_err;
1357 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1358 sband->ht_cap.cap);
1359 }
1360
1361 /*
1362 * If adding more here, adjust code in main.c
1363 * that calculates local->scan_ies_len.
1364 */
1365
1366 /* insert custom IEs that go before VHT */
1367 if (ie && ie_len) {
1368 static const u8 before_vht[] = {
1369 WLAN_EID_SSID,
1370 WLAN_EID_SUPP_RATES,
1371 WLAN_EID_REQUEST,
1372 WLAN_EID_EXT_SUPP_RATES,
1373 WLAN_EID_DS_PARAMS,
1374 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1375 WLAN_EID_HT_CAPABILITY,
1376 WLAN_EID_BSS_COEX_2040,
1377 WLAN_EID_EXT_CAPABILITY,
1378 WLAN_EID_SSID_LIST,
1379 WLAN_EID_CHANNEL_USAGE,
1380 WLAN_EID_INTERWORKING,
1381 /* mesh ID can't happen here */
1382 /* 60 GHz can't happen here right now */
1383 };
1384 noffset = ieee80211_ie_split(ie, ie_len,
1385 before_vht, ARRAY_SIZE(before_vht),
1386 *offset);
1387 if (end - pos < noffset - *offset)
1388 goto out_err;
1389 memcpy(pos, ie + *offset, noffset - *offset);
1390 pos += noffset - *offset;
1391 *offset = noffset;
1392 }
1393
1394 if (sband->vht_cap.vht_supported) {
1395 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1396 goto out_err;
1397 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1398 sband->vht_cap.cap);
1399 }
1400
1401 return pos - buffer;
1402 out_err:
1403 WARN_ONCE(1, "not enough space for preq IEs\n");
1404 return pos - buffer;
1405 }
1406
1407 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1408 size_t buffer_len,
1409 struct ieee80211_scan_ies *ie_desc,
1410 const u8 *ie, size_t ie_len,
1411 u8 bands_used, u32 *rate_masks,
1412 struct cfg80211_chan_def *chandef)
1413 {
1414 size_t pos = 0, old_pos = 0, custom_ie_offset = 0;
1415 int i;
1416
1417 memset(ie_desc, 0, sizeof(*ie_desc));
1418
1419 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1420 if (bands_used & BIT(i)) {
1421 pos += ieee80211_build_preq_ies_band(local,
1422 buffer + pos,
1423 buffer_len - pos,
1424 ie, ie_len, i,
1425 rate_masks[i],
1426 chandef,
1427 &custom_ie_offset);
1428 ie_desc->ies[i] = buffer + old_pos;
1429 ie_desc->len[i] = pos - old_pos;
1430 old_pos = pos;
1431 }
1432 }
1433
1434 /* add any remaining custom IEs */
1435 if (ie && ie_len) {
1436 if (WARN_ONCE(buffer_len - pos < ie_len - custom_ie_offset,
1437 "not enough space for preq custom IEs\n"))
1438 return pos;
1439 memcpy(buffer + pos, ie + custom_ie_offset,
1440 ie_len - custom_ie_offset);
1441 ie_desc->common_ies = buffer + pos;
1442 ie_desc->common_ie_len = ie_len - custom_ie_offset;
1443 pos += ie_len - custom_ie_offset;
1444 }
1445
1446 return pos;
1447 };
1448
1449 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1450 u8 *dst, u32 ratemask,
1451 struct ieee80211_channel *chan,
1452 const u8 *ssid, size_t ssid_len,
1453 const u8 *ie, size_t ie_len,
1454 bool directed)
1455 {
1456 struct ieee80211_local *local = sdata->local;
1457 struct cfg80211_chan_def chandef;
1458 struct sk_buff *skb;
1459 struct ieee80211_mgmt *mgmt;
1460 int ies_len;
1461 u32 rate_masks[IEEE80211_NUM_BANDS] = {};
1462 struct ieee80211_scan_ies dummy_ie_desc;
1463
1464 /*
1465 * Do not send DS Channel parameter for directed probe requests
1466 * in order to maximize the chance that we get a response. Some
1467 * badly-behaved APs don't respond when this parameter is included.
1468 */
1469 chandef.width = sdata->vif.bss_conf.chandef.width;
1470 if (directed)
1471 chandef.chan = NULL;
1472 else
1473 chandef.chan = chan;
1474
1475 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1476 ssid, ssid_len, 100 + ie_len);
1477 if (!skb)
1478 return NULL;
1479
1480 rate_masks[chan->band] = ratemask;
1481 ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1482 skb_tailroom(skb), &dummy_ie_desc,
1483 ie, ie_len, BIT(chan->band),
1484 rate_masks, &chandef);
1485 skb_put(skb, ies_len);
1486
1487 if (dst) {
1488 mgmt = (struct ieee80211_mgmt *) skb->data;
1489 memcpy(mgmt->da, dst, ETH_ALEN);
1490 memcpy(mgmt->bssid, dst, ETH_ALEN);
1491 }
1492
1493 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1494
1495 return skb;
1496 }
1497
1498 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1499 const u8 *ssid, size_t ssid_len,
1500 const u8 *ie, size_t ie_len,
1501 u32 ratemask, bool directed, u32 tx_flags,
1502 struct ieee80211_channel *channel, bool scan)
1503 {
1504 struct sk_buff *skb;
1505
1506 skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1507 ssid, ssid_len,
1508 ie, ie_len, directed);
1509 if (skb) {
1510 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
1511 if (scan)
1512 ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1513 else
1514 ieee80211_tx_skb(sdata, skb);
1515 }
1516 }
1517
1518 u32 ieee80211_sta_get_rates(struct ieee80211_sub_if_data *sdata,
1519 struct ieee802_11_elems *elems,
1520 enum ieee80211_band band, u32 *basic_rates)
1521 {
1522 struct ieee80211_supported_band *sband;
1523 size_t num_rates;
1524 u32 supp_rates, rate_flags;
1525 int i, j, shift;
1526 sband = sdata->local->hw.wiphy->bands[band];
1527
1528 rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
1529 shift = ieee80211_vif_get_shift(&sdata->vif);
1530
1531 if (WARN_ON(!sband))
1532 return 1;
1533
1534 num_rates = sband->n_bitrates;
1535 supp_rates = 0;
1536 for (i = 0; i < elems->supp_rates_len +
1537 elems->ext_supp_rates_len; i++) {
1538 u8 rate = 0;
1539 int own_rate;
1540 bool is_basic;
1541 if (i < elems->supp_rates_len)
1542 rate = elems->supp_rates[i];
1543 else if (elems->ext_supp_rates)
1544 rate = elems->ext_supp_rates
1545 [i - elems->supp_rates_len];
1546 own_rate = 5 * (rate & 0x7f);
1547 is_basic = !!(rate & 0x80);
1548
1549 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1550 continue;
1551
1552 for (j = 0; j < num_rates; j++) {
1553 int brate;
1554 if ((rate_flags & sband->bitrates[j].flags)
1555 != rate_flags)
1556 continue;
1557
1558 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
1559 1 << shift);
1560
1561 if (brate == own_rate) {
1562 supp_rates |= BIT(j);
1563 if (basic_rates && is_basic)
1564 *basic_rates |= BIT(j);
1565 }
1566 }
1567 }
1568 return supp_rates;
1569 }
1570
1571 void ieee80211_stop_device(struct ieee80211_local *local)
1572 {
1573 ieee80211_led_radio(local, false);
1574 ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1575
1576 cancel_work_sync(&local->reconfig_filter);
1577
1578 flush_workqueue(local->workqueue);
1579 drv_stop(local);
1580 }
1581
1582 static void ieee80211_handle_reconfig_failure(struct ieee80211_local *local)
1583 {
1584 struct ieee80211_sub_if_data *sdata;
1585 struct ieee80211_chanctx *ctx;
1586
1587 /*
1588 * We get here if during resume the device can't be restarted properly.
1589 * We might also get here if this happens during HW reset, which is a
1590 * slightly different situation and we need to drop all connections in
1591 * the latter case.
1592 *
1593 * Ask cfg80211 to turn off all interfaces, this will result in more
1594 * warnings but at least we'll then get into a clean stopped state.
1595 */
1596
1597 local->resuming = false;
1598 local->suspended = false;
1599 local->started = false;
1600
1601 /* scheduled scan clearly can't be running any more, but tell
1602 * cfg80211 and clear local state
1603 */
1604 ieee80211_sched_scan_end(local);
1605
1606 list_for_each_entry(sdata, &local->interfaces, list)
1607 sdata->flags &= ~IEEE80211_SDATA_IN_DRIVER;
1608
1609 /* Mark channel contexts as not being in the driver any more to avoid
1610 * removing them from the driver during the shutdown process...
1611 */
1612 mutex_lock(&local->chanctx_mtx);
1613 list_for_each_entry(ctx, &local->chanctx_list, list)
1614 ctx->driver_present = false;
1615 mutex_unlock(&local->chanctx_mtx);
1616
1617 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1618 }
1619
1620 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1621 struct ieee80211_sub_if_data *sdata)
1622 {
1623 struct ieee80211_chanctx_conf *conf;
1624 struct ieee80211_chanctx *ctx;
1625
1626 if (!local->use_chanctx)
1627 return;
1628
1629 mutex_lock(&local->chanctx_mtx);
1630 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1631 lockdep_is_held(&local->chanctx_mtx));
1632 if (conf) {
1633 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1634 drv_assign_vif_chanctx(local, sdata, ctx);
1635 }
1636 mutex_unlock(&local->chanctx_mtx);
1637 }
1638
1639 int ieee80211_reconfig(struct ieee80211_local *local)
1640 {
1641 struct ieee80211_hw *hw = &local->hw;
1642 struct ieee80211_sub_if_data *sdata;
1643 struct ieee80211_chanctx *ctx;
1644 struct sta_info *sta;
1645 int res, i;
1646 bool reconfig_due_to_wowlan = false;
1647 struct ieee80211_sub_if_data *sched_scan_sdata;
1648 bool sched_scan_stopped = false;
1649
1650 #ifdef CONFIG_PM
1651 if (local->suspended)
1652 local->resuming = true;
1653
1654 if (local->wowlan) {
1655 res = drv_resume(local);
1656 local->wowlan = false;
1657 if (res < 0) {
1658 local->resuming = false;
1659 return res;
1660 }
1661 if (res == 0)
1662 goto wake_up;
1663 WARN_ON(res > 1);
1664 /*
1665 * res is 1, which means the driver requested
1666 * to go through a regular reset on wakeup.
1667 */
1668 reconfig_due_to_wowlan = true;
1669 }
1670 #endif
1671 /* everything else happens only if HW was up & running */
1672 if (!local->open_count)
1673 goto wake_up;
1674
1675 /*
1676 * Upon resume hardware can sometimes be goofy due to
1677 * various platform / driver / bus issues, so restarting
1678 * the device may at times not work immediately. Propagate
1679 * the error.
1680 */
1681 res = drv_start(local);
1682 if (res) {
1683 if (local->suspended)
1684 WARN(1, "Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue.\n");
1685 else
1686 WARN(1, "Hardware became unavailable during restart.\n");
1687 ieee80211_handle_reconfig_failure(local);
1688 return res;
1689 }
1690
1691 /* setup fragmentation threshold */
1692 drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1693
1694 /* setup RTS threshold */
1695 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1696
1697 /* reset coverage class */
1698 drv_set_coverage_class(local, hw->wiphy->coverage_class);
1699
1700 ieee80211_led_radio(local, true);
1701 ieee80211_mod_tpt_led_trig(local,
1702 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1703
1704 /* add interfaces */
1705 sdata = rtnl_dereference(local->monitor_sdata);
1706 if (sdata) {
1707 /* in HW restart it exists already */
1708 WARN_ON(local->resuming);
1709 res = drv_add_interface(local, sdata);
1710 if (WARN_ON(res)) {
1711 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1712 synchronize_net();
1713 kfree(sdata);
1714 }
1715 }
1716
1717 list_for_each_entry(sdata, &local->interfaces, list) {
1718 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1719 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1720 ieee80211_sdata_running(sdata))
1721 res = drv_add_interface(local, sdata);
1722 }
1723
1724 /* add channel contexts */
1725 if (local->use_chanctx) {
1726 mutex_lock(&local->chanctx_mtx);
1727 list_for_each_entry(ctx, &local->chanctx_list, list)
1728 if (ctx->replace_state !=
1729 IEEE80211_CHANCTX_REPLACES_OTHER)
1730 WARN_ON(drv_add_chanctx(local, ctx));
1731 mutex_unlock(&local->chanctx_mtx);
1732
1733 list_for_each_entry(sdata, &local->interfaces, list) {
1734 if (!ieee80211_sdata_running(sdata))
1735 continue;
1736 ieee80211_assign_chanctx(local, sdata);
1737 }
1738
1739 sdata = rtnl_dereference(local->monitor_sdata);
1740 if (sdata && ieee80211_sdata_running(sdata))
1741 ieee80211_assign_chanctx(local, sdata);
1742 }
1743
1744 /* add STAs back */
1745 mutex_lock(&local->sta_mtx);
1746 list_for_each_entry(sta, &local->sta_list, list) {
1747 enum ieee80211_sta_state state;
1748
1749 if (!sta->uploaded)
1750 continue;
1751
1752 /* AP-mode stations will be added later */
1753 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1754 continue;
1755
1756 for (state = IEEE80211_STA_NOTEXIST;
1757 state < sta->sta_state; state++)
1758 WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1759 state + 1));
1760 }
1761 mutex_unlock(&local->sta_mtx);
1762
1763 /* reconfigure tx conf */
1764 if (hw->queues >= IEEE80211_NUM_ACS) {
1765 list_for_each_entry(sdata, &local->interfaces, list) {
1766 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1767 sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1768 !ieee80211_sdata_running(sdata))
1769 continue;
1770
1771 for (i = 0; i < IEEE80211_NUM_ACS; i++)
1772 drv_conf_tx(local, sdata, i,
1773 &sdata->tx_conf[i]);
1774 }
1775 }
1776
1777 /* reconfigure hardware */
1778 ieee80211_hw_config(local, ~0);
1779
1780 ieee80211_configure_filter(local);
1781
1782 /* Finally also reconfigure all the BSS information */
1783 list_for_each_entry(sdata, &local->interfaces, list) {
1784 u32 changed;
1785
1786 if (!ieee80211_sdata_running(sdata))
1787 continue;
1788
1789 /* common change flags for all interface types */
1790 changed = BSS_CHANGED_ERP_CTS_PROT |
1791 BSS_CHANGED_ERP_PREAMBLE |
1792 BSS_CHANGED_ERP_SLOT |
1793 BSS_CHANGED_HT |
1794 BSS_CHANGED_BASIC_RATES |
1795 BSS_CHANGED_BEACON_INT |
1796 BSS_CHANGED_BSSID |
1797 BSS_CHANGED_CQM |
1798 BSS_CHANGED_QOS |
1799 BSS_CHANGED_IDLE |
1800 BSS_CHANGED_TXPOWER;
1801
1802 switch (sdata->vif.type) {
1803 case NL80211_IFTYPE_STATION:
1804 changed |= BSS_CHANGED_ASSOC |
1805 BSS_CHANGED_ARP_FILTER |
1806 BSS_CHANGED_PS;
1807
1808 /* Re-send beacon info report to the driver */
1809 if (sdata->u.mgd.have_beacon)
1810 changed |= BSS_CHANGED_BEACON_INFO;
1811
1812 sdata_lock(sdata);
1813 ieee80211_bss_info_change_notify(sdata, changed);
1814 sdata_unlock(sdata);
1815 break;
1816 case NL80211_IFTYPE_ADHOC:
1817 changed |= BSS_CHANGED_IBSS;
1818 /* fall through */
1819 case NL80211_IFTYPE_AP:
1820 changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1821
1822 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1823 changed |= BSS_CHANGED_AP_PROBE_RESP;
1824
1825 if (rcu_access_pointer(sdata->u.ap.beacon))
1826 drv_start_ap(local, sdata);
1827 }
1828
1829 /* fall through */
1830 case NL80211_IFTYPE_MESH_POINT:
1831 if (sdata->vif.bss_conf.enable_beacon) {
1832 changed |= BSS_CHANGED_BEACON |
1833 BSS_CHANGED_BEACON_ENABLED;
1834 ieee80211_bss_info_change_notify(sdata, changed);
1835 }
1836 break;
1837 case NL80211_IFTYPE_WDS:
1838 case NL80211_IFTYPE_AP_VLAN:
1839 case NL80211_IFTYPE_MONITOR:
1840 case NL80211_IFTYPE_P2P_DEVICE:
1841 /* nothing to do */
1842 break;
1843 case NL80211_IFTYPE_UNSPECIFIED:
1844 case NUM_NL80211_IFTYPES:
1845 case NL80211_IFTYPE_P2P_CLIENT:
1846 case NL80211_IFTYPE_P2P_GO:
1847 WARN_ON(1);
1848 break;
1849 }
1850 }
1851
1852 ieee80211_recalc_ps(local, -1);
1853
1854 /*
1855 * The sta might be in psm against the ap (e.g. because
1856 * this was the state before a hw restart), so we
1857 * explicitly send a null packet in order to make sure
1858 * it'll sync against the ap (and get out of psm).
1859 */
1860 if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1861 list_for_each_entry(sdata, &local->interfaces, list) {
1862 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1863 continue;
1864 if (!sdata->u.mgd.associated)
1865 continue;
1866
1867 ieee80211_send_nullfunc(local, sdata, 0);
1868 }
1869 }
1870
1871 /* APs are now beaconing, add back stations */
1872 mutex_lock(&local->sta_mtx);
1873 list_for_each_entry(sta, &local->sta_list, list) {
1874 enum ieee80211_sta_state state;
1875
1876 if (!sta->uploaded)
1877 continue;
1878
1879 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1880 continue;
1881
1882 for (state = IEEE80211_STA_NOTEXIST;
1883 state < sta->sta_state; state++)
1884 WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1885 state + 1));
1886 }
1887 mutex_unlock(&local->sta_mtx);
1888
1889 /* add back keys */
1890 list_for_each_entry(sdata, &local->interfaces, list)
1891 if (ieee80211_sdata_running(sdata))
1892 ieee80211_enable_keys(sdata);
1893
1894 wake_up:
1895 local->in_reconfig = false;
1896 barrier();
1897
1898 if (local->monitors == local->open_count && local->monitors > 0)
1899 ieee80211_add_virtual_monitor(local);
1900
1901 /*
1902 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1903 * sessions can be established after a resume.
1904 *
1905 * Also tear down aggregation sessions since reconfiguring
1906 * them in a hardware restart scenario is not easily done
1907 * right now, and the hardware will have lost information
1908 * about the sessions, but we and the AP still think they
1909 * are active. This is really a workaround though.
1910 */
1911 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1912 mutex_lock(&local->sta_mtx);
1913
1914 list_for_each_entry(sta, &local->sta_list, list) {
1915 ieee80211_sta_tear_down_BA_sessions(
1916 sta, AGG_STOP_LOCAL_REQUEST);
1917 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1918 }
1919
1920 mutex_unlock(&local->sta_mtx);
1921 }
1922
1923 ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
1924 IEEE80211_QUEUE_STOP_REASON_SUSPEND,
1925 false);
1926
1927 /*
1928 * Reconfigure sched scan if it was interrupted by FW restart or
1929 * suspend.
1930 */
1931 mutex_lock(&local->mtx);
1932 sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1933 lockdep_is_held(&local->mtx));
1934 if (sched_scan_sdata && local->sched_scan_req)
1935 /*
1936 * Sched scan stopped, but we don't want to report it. Instead,
1937 * we're trying to reschedule.
1938 */
1939 if (__ieee80211_request_sched_scan_start(sched_scan_sdata,
1940 local->sched_scan_req))
1941 sched_scan_stopped = true;
1942 mutex_unlock(&local->mtx);
1943
1944 if (sched_scan_stopped)
1945 cfg80211_sched_scan_stopped_rtnl(local->hw.wiphy);
1946
1947 /*
1948 * If this is for hw restart things are still running.
1949 * We may want to change that later, however.
1950 */
1951 if (!local->suspended || reconfig_due_to_wowlan)
1952 drv_restart_complete(local);
1953
1954 if (!local->suspended)
1955 return 0;
1956
1957 #ifdef CONFIG_PM
1958 /* first set suspended false, then resuming */
1959 local->suspended = false;
1960 mb();
1961 local->resuming = false;
1962
1963 list_for_each_entry(sdata, &local->interfaces, list) {
1964 if (!ieee80211_sdata_running(sdata))
1965 continue;
1966 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1967 ieee80211_sta_restart(sdata);
1968 }
1969
1970 mod_timer(&local->sta_cleanup, jiffies + 1);
1971 #else
1972 WARN_ON(1);
1973 #endif
1974
1975 return 0;
1976 }
1977
1978 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1979 {
1980 struct ieee80211_sub_if_data *sdata;
1981 struct ieee80211_local *local;
1982 struct ieee80211_key *key;
1983
1984 if (WARN_ON(!vif))
1985 return;
1986
1987 sdata = vif_to_sdata(vif);
1988 local = sdata->local;
1989
1990 if (WARN_ON(!local->resuming))
1991 return;
1992
1993 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1994 return;
1995
1996 sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1997
1998 mutex_lock(&local->key_mtx);
1999 list_for_each_entry(key, &sdata->key_list, list)
2000 key->flags |= KEY_FLAG_TAINTED;
2001 mutex_unlock(&local->key_mtx);
2002 }
2003 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
2004
2005 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
2006 {
2007 struct ieee80211_local *local = sdata->local;
2008 struct ieee80211_chanctx_conf *chanctx_conf;
2009 struct ieee80211_chanctx *chanctx;
2010
2011 mutex_lock(&local->chanctx_mtx);
2012
2013 chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2014 lockdep_is_held(&local->chanctx_mtx));
2015
2016 if (WARN_ON_ONCE(!chanctx_conf))
2017 goto unlock;
2018
2019 chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2020 ieee80211_recalc_smps_chanctx(local, chanctx);
2021 unlock:
2022 mutex_unlock(&local->chanctx_mtx);
2023 }
2024
2025 void ieee80211_recalc_min_chandef(struct ieee80211_sub_if_data *sdata)
2026 {
2027 struct ieee80211_local *local = sdata->local;
2028 struct ieee80211_chanctx_conf *chanctx_conf;
2029 struct ieee80211_chanctx *chanctx;
2030
2031 mutex_lock(&local->chanctx_mtx);
2032
2033 chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2034 lockdep_is_held(&local->chanctx_mtx));
2035
2036 if (WARN_ON_ONCE(!chanctx_conf))
2037 goto unlock;
2038
2039 chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2040 ieee80211_recalc_chanctx_min_def(local, chanctx);
2041 unlock:
2042 mutex_unlock(&local->chanctx_mtx);
2043 }
2044
2045 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
2046 {
2047 int i;
2048
2049 for (i = 0; i < n_ids; i++)
2050 if (ids[i] == id)
2051 return true;
2052 return false;
2053 }
2054
2055 /**
2056 * ieee80211_ie_split - split an IE buffer according to ordering
2057 *
2058 * @ies: the IE buffer
2059 * @ielen: the length of the IE buffer
2060 * @ids: an array with element IDs that are allowed before
2061 * the split
2062 * @n_ids: the size of the element ID array
2063 * @offset: offset where to start splitting in the buffer
2064 *
2065 * This function splits an IE buffer by updating the @offset
2066 * variable to point to the location where the buffer should be
2067 * split.
2068 *
2069 * It assumes that the given IE buffer is well-formed, this
2070 * has to be guaranteed by the caller!
2071 *
2072 * It also assumes that the IEs in the buffer are ordered
2073 * correctly, if not the result of using this function will not
2074 * be ordered correctly either, i.e. it does no reordering.
2075 *
2076 * The function returns the offset where the next part of the
2077 * buffer starts, which may be @ielen if the entire (remainder)
2078 * of the buffer should be used.
2079 */
2080 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
2081 const u8 *ids, int n_ids, size_t offset)
2082 {
2083 size_t pos = offset;
2084
2085 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
2086 pos += 2 + ies[pos + 1];
2087
2088 return pos;
2089 }
2090
2091 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
2092 {
2093 size_t pos = offset;
2094
2095 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
2096 pos += 2 + ies[pos + 1];
2097
2098 return pos;
2099 }
2100
2101 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
2102 int rssi_min_thold,
2103 int rssi_max_thold)
2104 {
2105 trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
2106
2107 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2108 return;
2109
2110 /*
2111 * Scale up threshold values before storing it, as the RSSI averaging
2112 * algorithm uses a scaled up value as well. Change this scaling
2113 * factor if the RSSI averaging algorithm changes.
2114 */
2115 sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
2116 sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
2117 }
2118
2119 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
2120 int rssi_min_thold,
2121 int rssi_max_thold)
2122 {
2123 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2124
2125 WARN_ON(rssi_min_thold == rssi_max_thold ||
2126 rssi_min_thold > rssi_max_thold);
2127
2128 _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
2129 rssi_max_thold);
2130 }
2131 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
2132
2133 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
2134 {
2135 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2136
2137 _ieee80211_enable_rssi_reports(sdata, 0, 0);
2138 }
2139 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
2140
2141 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2142 u16 cap)
2143 {
2144 __le16 tmp;
2145
2146 *pos++ = WLAN_EID_HT_CAPABILITY;
2147 *pos++ = sizeof(struct ieee80211_ht_cap);
2148 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
2149
2150 /* capability flags */
2151 tmp = cpu_to_le16(cap);
2152 memcpy(pos, &tmp, sizeof(u16));
2153 pos += sizeof(u16);
2154
2155 /* AMPDU parameters */
2156 *pos++ = ht_cap->ampdu_factor |
2157 (ht_cap->ampdu_density <<
2158 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
2159
2160 /* MCS set */
2161 memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
2162 pos += sizeof(ht_cap->mcs);
2163
2164 /* extended capabilities */
2165 pos += sizeof(__le16);
2166
2167 /* BF capabilities */
2168 pos += sizeof(__le32);
2169
2170 /* antenna selection */
2171 pos += sizeof(u8);
2172
2173 return pos;
2174 }
2175
2176 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2177 u32 cap)
2178 {
2179 __le32 tmp;
2180
2181 *pos++ = WLAN_EID_VHT_CAPABILITY;
2182 *pos++ = sizeof(struct ieee80211_vht_cap);
2183 memset(pos, 0, sizeof(struct ieee80211_vht_cap));
2184
2185 /* capability flags */
2186 tmp = cpu_to_le32(cap);
2187 memcpy(pos, &tmp, sizeof(u32));
2188 pos += sizeof(u32);
2189
2190 /* VHT MCS set */
2191 memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
2192 pos += sizeof(vht_cap->vht_mcs);
2193
2194 return pos;
2195 }
2196
2197 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2198 const struct cfg80211_chan_def *chandef,
2199 u16 prot_mode)
2200 {
2201 struct ieee80211_ht_operation *ht_oper;
2202 /* Build HT Information */
2203 *pos++ = WLAN_EID_HT_OPERATION;
2204 *pos++ = sizeof(struct ieee80211_ht_operation);
2205 ht_oper = (struct ieee80211_ht_operation *)pos;
2206 ht_oper->primary_chan = ieee80211_frequency_to_channel(
2207 chandef->chan->center_freq);
2208 switch (chandef->width) {
2209 case NL80211_CHAN_WIDTH_160:
2210 case NL80211_CHAN_WIDTH_80P80:
2211 case NL80211_CHAN_WIDTH_80:
2212 case NL80211_CHAN_WIDTH_40:
2213 if (chandef->center_freq1 > chandef->chan->center_freq)
2214 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2215 else
2216 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2217 break;
2218 default:
2219 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
2220 break;
2221 }
2222 if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
2223 chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
2224 chandef->width != NL80211_CHAN_WIDTH_20)
2225 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
2226
2227 ht_oper->operation_mode = cpu_to_le16(prot_mode);
2228 ht_oper->stbc_param = 0x0000;
2229
2230 /* It seems that Basic MCS set and Supported MCS set
2231 are identical for the first 10 bytes */
2232 memset(&ht_oper->basic_set, 0, 16);
2233 memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
2234
2235 return pos + sizeof(struct ieee80211_ht_operation);
2236 }
2237
2238 void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan,
2239 const struct ieee80211_ht_operation *ht_oper,
2240 struct cfg80211_chan_def *chandef)
2241 {
2242 enum nl80211_channel_type channel_type;
2243
2244 if (!ht_oper) {
2245 cfg80211_chandef_create(chandef, control_chan,
2246 NL80211_CHAN_NO_HT);
2247 return;
2248 }
2249
2250 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
2251 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
2252 channel_type = NL80211_CHAN_HT20;
2253 break;
2254 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
2255 channel_type = NL80211_CHAN_HT40PLUS;
2256 break;
2257 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
2258 channel_type = NL80211_CHAN_HT40MINUS;
2259 break;
2260 default:
2261 channel_type = NL80211_CHAN_NO_HT;
2262 }
2263
2264 cfg80211_chandef_create(chandef, control_chan, channel_type);
2265 }
2266
2267 int ieee80211_parse_bitrates(struct cfg80211_chan_def *chandef,
2268 const struct ieee80211_supported_band *sband,
2269 const u8 *srates, int srates_len, u32 *rates)
2270 {
2271 u32 rate_flags = ieee80211_chandef_rate_flags(chandef);
2272 int shift = ieee80211_chandef_get_shift(chandef);
2273 struct ieee80211_rate *br;
2274 int brate, rate, i, j, count = 0;
2275
2276 *rates = 0;
2277
2278 for (i = 0; i < srates_len; i++) {
2279 rate = srates[i] & 0x7f;
2280
2281 for (j = 0; j < sband->n_bitrates; j++) {
2282 br = &sband->bitrates[j];
2283 if ((rate_flags & br->flags) != rate_flags)
2284 continue;
2285
2286 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2287 if (brate == rate) {
2288 *rates |= BIT(j);
2289 count++;
2290 break;
2291 }
2292 }
2293 }
2294 return count;
2295 }
2296
2297 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
2298 struct sk_buff *skb, bool need_basic,
2299 enum ieee80211_band band)
2300 {
2301 struct ieee80211_local *local = sdata->local;
2302 struct ieee80211_supported_band *sband;
2303 int rate, shift;
2304 u8 i, rates, *pos;
2305 u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2306 u32 rate_flags;
2307
2308 shift = ieee80211_vif_get_shift(&sdata->vif);
2309 rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2310 sband = local->hw.wiphy->bands[band];
2311 rates = 0;
2312 for (i = 0; i < sband->n_bitrates; i++) {
2313 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2314 continue;
2315 rates++;
2316 }
2317 if (rates > 8)
2318 rates = 8;
2319
2320 if (skb_tailroom(skb) < rates + 2)
2321 return -ENOMEM;
2322
2323 pos = skb_put(skb, rates + 2);
2324 *pos++ = WLAN_EID_SUPP_RATES;
2325 *pos++ = rates;
2326 for (i = 0; i < rates; i++) {
2327 u8 basic = 0;
2328 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2329 continue;
2330
2331 if (need_basic && basic_rates & BIT(i))
2332 basic = 0x80;
2333 rate = sband->bitrates[i].bitrate;
2334 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2335 5 * (1 << shift));
2336 *pos++ = basic | (u8) rate;
2337 }
2338
2339 return 0;
2340 }
2341
2342 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2343 struct sk_buff *skb, bool need_basic,
2344 enum ieee80211_band band)
2345 {
2346 struct ieee80211_local *local = sdata->local;
2347 struct ieee80211_supported_band *sband;
2348 int rate, shift;
2349 u8 i, exrates, *pos;
2350 u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2351 u32 rate_flags;
2352
2353 rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2354 shift = ieee80211_vif_get_shift(&sdata->vif);
2355
2356 sband = local->hw.wiphy->bands[band];
2357 exrates = 0;
2358 for (i = 0; i < sband->n_bitrates; i++) {
2359 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2360 continue;
2361 exrates++;
2362 }
2363
2364 if (exrates > 8)
2365 exrates -= 8;
2366 else
2367 exrates = 0;
2368
2369 if (skb_tailroom(skb) < exrates + 2)
2370 return -ENOMEM;
2371
2372 if (exrates) {
2373 pos = skb_put(skb, exrates + 2);
2374 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2375 *pos++ = exrates;
2376 for (i = 8; i < sband->n_bitrates; i++) {
2377 u8 basic = 0;
2378 if ((rate_flags & sband->bitrates[i].flags)
2379 != rate_flags)
2380 continue;
2381 if (need_basic && basic_rates & BIT(i))
2382 basic = 0x80;
2383 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2384 5 * (1 << shift));
2385 *pos++ = basic | (u8) rate;
2386 }
2387 }
2388 return 0;
2389 }
2390
2391 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2392 {
2393 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2394 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2395
2396 if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2397 /* non-managed type inferfaces */
2398 return 0;
2399 }
2400 return ifmgd->ave_beacon_signal / 16;
2401 }
2402 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2403
2404 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2405 {
2406 if (!mcs)
2407 return 1;
2408
2409 /* TODO: consider rx_highest */
2410
2411 if (mcs->rx_mask[3])
2412 return 4;
2413 if (mcs->rx_mask[2])
2414 return 3;
2415 if (mcs->rx_mask[1])
2416 return 2;
2417 return 1;
2418 }
2419
2420 /**
2421 * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2422 * @local: mac80211 hw info struct
2423 * @status: RX status
2424 * @mpdu_len: total MPDU length (including FCS)
2425 * @mpdu_offset: offset into MPDU to calculate timestamp at
2426 *
2427 * This function calculates the RX timestamp at the given MPDU offset, taking
2428 * into account what the RX timestamp was. An offset of 0 will just normalize
2429 * the timestamp to TSF at beginning of MPDU reception.
2430 */
2431 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2432 struct ieee80211_rx_status *status,
2433 unsigned int mpdu_len,
2434 unsigned int mpdu_offset)
2435 {
2436 u64 ts = status->mactime;
2437 struct rate_info ri;
2438 u16 rate;
2439
2440 if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2441 return 0;
2442
2443 memset(&ri, 0, sizeof(ri));
2444
2445 /* Fill cfg80211 rate info */
2446 if (status->flag & RX_FLAG_HT) {
2447 ri.mcs = status->rate_idx;
2448 ri.flags |= RATE_INFO_FLAGS_MCS;
2449 if (status->flag & RX_FLAG_40MHZ)
2450 ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2451 if (status->flag & RX_FLAG_SHORT_GI)
2452 ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2453 } else if (status->flag & RX_FLAG_VHT) {
2454 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2455 ri.mcs = status->rate_idx;
2456 ri.nss = status->vht_nss;
2457 if (status->flag & RX_FLAG_40MHZ)
2458 ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2459 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
2460 ri.flags |= RATE_INFO_FLAGS_80_MHZ_WIDTH;
2461 if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
2462 ri.flags |= RATE_INFO_FLAGS_80P80_MHZ_WIDTH;
2463 if (status->vht_flag & RX_VHT_FLAG_160MHZ)
2464 ri.flags |= RATE_INFO_FLAGS_160_MHZ_WIDTH;
2465 if (status->flag & RX_FLAG_SHORT_GI)
2466 ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2467 } else {
2468 struct ieee80211_supported_band *sband;
2469 int shift = 0;
2470 int bitrate;
2471
2472 if (status->flag & RX_FLAG_10MHZ)
2473 shift = 1;
2474 if (status->flag & RX_FLAG_5MHZ)
2475 shift = 2;
2476
2477 sband = local->hw.wiphy->bands[status->band];
2478 bitrate = sband->bitrates[status->rate_idx].bitrate;
2479 ri.legacy = DIV_ROUND_UP(bitrate, (1 << shift));
2480 }
2481
2482 rate = cfg80211_calculate_bitrate(&ri);
2483 if (WARN_ONCE(!rate,
2484 "Invalid bitrate: flags=0x%x, idx=%d, vht_nss=%d\n",
2485 status->flag, status->rate_idx, status->vht_nss))
2486 return 0;
2487
2488 /* rewind from end of MPDU */
2489 if (status->flag & RX_FLAG_MACTIME_END)
2490 ts -= mpdu_len * 8 * 10 / rate;
2491
2492 ts += mpdu_offset * 8 * 10 / rate;
2493
2494 return ts;
2495 }
2496
2497 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2498 {
2499 struct ieee80211_sub_if_data *sdata;
2500 struct cfg80211_chan_def chandef;
2501
2502 mutex_lock(&local->mtx);
2503 mutex_lock(&local->iflist_mtx);
2504 list_for_each_entry(sdata, &local->interfaces, list) {
2505 /* it might be waiting for the local->mtx, but then
2506 * by the time it gets it, sdata->wdev.cac_started
2507 * will no longer be true
2508 */
2509 cancel_delayed_work(&sdata->dfs_cac_timer_work);
2510
2511 if (sdata->wdev.cac_started) {
2512 chandef = sdata->vif.bss_conf.chandef;
2513 ieee80211_vif_release_channel(sdata);
2514 cfg80211_cac_event(sdata->dev,
2515 &chandef,
2516 NL80211_RADAR_CAC_ABORTED,
2517 GFP_KERNEL);
2518 }
2519 }
2520 mutex_unlock(&local->iflist_mtx);
2521 mutex_unlock(&local->mtx);
2522 }
2523
2524 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2525 {
2526 struct ieee80211_local *local =
2527 container_of(work, struct ieee80211_local, radar_detected_work);
2528 struct cfg80211_chan_def chandef = local->hw.conf.chandef;
2529
2530 ieee80211_dfs_cac_cancel(local);
2531
2532 if (local->use_chanctx)
2533 /* currently not handled */
2534 WARN_ON(1);
2535 else
2536 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
2537 }
2538
2539 void ieee80211_radar_detected(struct ieee80211_hw *hw)
2540 {
2541 struct ieee80211_local *local = hw_to_local(hw);
2542
2543 trace_api_radar_detected(local);
2544
2545 ieee80211_queue_work(hw, &local->radar_detected_work);
2546 }
2547 EXPORT_SYMBOL(ieee80211_radar_detected);
2548
2549 u32 ieee80211_chandef_downgrade(struct cfg80211_chan_def *c)
2550 {
2551 u32 ret;
2552 int tmp;
2553
2554 switch (c->width) {
2555 case NL80211_CHAN_WIDTH_20:
2556 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2557 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2558 break;
2559 case NL80211_CHAN_WIDTH_40:
2560 c->width = NL80211_CHAN_WIDTH_20;
2561 c->center_freq1 = c->chan->center_freq;
2562 ret = IEEE80211_STA_DISABLE_40MHZ |
2563 IEEE80211_STA_DISABLE_VHT;
2564 break;
2565 case NL80211_CHAN_WIDTH_80:
2566 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
2567 /* n_P40 */
2568 tmp /= 2;
2569 /* freq_P40 */
2570 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
2571 c->width = NL80211_CHAN_WIDTH_40;
2572 ret = IEEE80211_STA_DISABLE_VHT;
2573 break;
2574 case NL80211_CHAN_WIDTH_80P80:
2575 c->center_freq2 = 0;
2576 c->width = NL80211_CHAN_WIDTH_80;
2577 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2578 IEEE80211_STA_DISABLE_160MHZ;
2579 break;
2580 case NL80211_CHAN_WIDTH_160:
2581 /* n_P20 */
2582 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
2583 /* n_P80 */
2584 tmp /= 4;
2585 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
2586 c->width = NL80211_CHAN_WIDTH_80;
2587 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2588 IEEE80211_STA_DISABLE_160MHZ;
2589 break;
2590 default:
2591 case NL80211_CHAN_WIDTH_20_NOHT:
2592 WARN_ON_ONCE(1);
2593 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2594 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2595 break;
2596 case NL80211_CHAN_WIDTH_5:
2597 case NL80211_CHAN_WIDTH_10:
2598 WARN_ON_ONCE(1);
2599 /* keep c->width */
2600 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2601 break;
2602 }
2603
2604 WARN_ON_ONCE(!cfg80211_chandef_valid(c));
2605
2606 return ret;
2607 }
2608
2609 /*
2610 * Returns true if smps_mode_new is strictly more restrictive than
2611 * smps_mode_old.
2612 */
2613 bool ieee80211_smps_is_restrictive(enum ieee80211_smps_mode smps_mode_old,
2614 enum ieee80211_smps_mode smps_mode_new)
2615 {
2616 if (WARN_ON_ONCE(smps_mode_old == IEEE80211_SMPS_AUTOMATIC ||
2617 smps_mode_new == IEEE80211_SMPS_AUTOMATIC))
2618 return false;
2619
2620 switch (smps_mode_old) {
2621 case IEEE80211_SMPS_STATIC:
2622 return false;
2623 case IEEE80211_SMPS_DYNAMIC:
2624 return smps_mode_new == IEEE80211_SMPS_STATIC;
2625 case IEEE80211_SMPS_OFF:
2626 return smps_mode_new != IEEE80211_SMPS_OFF;
2627 default:
2628 WARN_ON(1);
2629 }
2630
2631 return false;
2632 }
2633
2634 int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
2635 struct cfg80211_csa_settings *csa_settings)
2636 {
2637 struct sk_buff *skb;
2638 struct ieee80211_mgmt *mgmt;
2639 struct ieee80211_local *local = sdata->local;
2640 int freq;
2641 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.chan_switch) +
2642 sizeof(mgmt->u.action.u.chan_switch);
2643 u8 *pos;
2644
2645 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2646 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2647 return -EOPNOTSUPP;
2648
2649 skb = dev_alloc_skb(local->tx_headroom + hdr_len +
2650 5 + /* channel switch announcement element */
2651 3 + /* secondary channel offset element */
2652 8); /* mesh channel switch parameters element */
2653 if (!skb)
2654 return -ENOMEM;
2655
2656 skb_reserve(skb, local->tx_headroom);
2657 mgmt = (struct ieee80211_mgmt *)skb_put(skb, hdr_len);
2658 memset(mgmt, 0, hdr_len);
2659 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2660 IEEE80211_STYPE_ACTION);
2661
2662 eth_broadcast_addr(mgmt->da);
2663 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2664 if (ieee80211_vif_is_mesh(&sdata->vif)) {
2665 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2666 } else {
2667 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2668 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
2669 }
2670 mgmt->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
2671 mgmt->u.action.u.chan_switch.action_code = WLAN_ACTION_SPCT_CHL_SWITCH;
2672 pos = skb_put(skb, 5);
2673 *pos++ = WLAN_EID_CHANNEL_SWITCH; /* EID */
2674 *pos++ = 3; /* IE length */
2675 *pos++ = csa_settings->block_tx ? 1 : 0; /* CSA mode */
2676 freq = csa_settings->chandef.chan->center_freq;
2677 *pos++ = ieee80211_frequency_to_channel(freq); /* channel */
2678 *pos++ = csa_settings->count; /* count */
2679
2680 if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_40) {
2681 enum nl80211_channel_type ch_type;
2682
2683 skb_put(skb, 3);
2684 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
2685 *pos++ = 1; /* IE length */
2686 ch_type = cfg80211_get_chandef_type(&csa_settings->chandef);
2687 if (ch_type == NL80211_CHAN_HT40PLUS)
2688 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2689 else
2690 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2691 }
2692
2693 if (ieee80211_vif_is_mesh(&sdata->vif)) {
2694 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2695
2696 skb_put(skb, 8);
2697 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM; /* EID */
2698 *pos++ = 6; /* IE length */
2699 *pos++ = sdata->u.mesh.mshcfg.dot11MeshTTL; /* Mesh TTL */
2700 *pos = 0x00; /* Mesh Flag: Tx Restrict, Initiator, Reason */
2701 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
2702 *pos++ |= csa_settings->block_tx ?
2703 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
2704 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); /* Reason Cd */
2705 pos += 2;
2706 put_unaligned_le16(ifmsh->pre_value, pos);/* Precedence Value */
2707 pos += 2;
2708 }
2709
2710 ieee80211_tx_skb(sdata, skb);
2711 return 0;
2712 }
2713
2714 bool ieee80211_cs_valid(const struct ieee80211_cipher_scheme *cs)
2715 {
2716 return !(cs == NULL || cs->cipher == 0 ||
2717 cs->hdr_len < cs->pn_len + cs->pn_off ||
2718 cs->hdr_len <= cs->key_idx_off ||
2719 cs->key_idx_shift > 7 ||
2720 cs->key_idx_mask == 0);
2721 }
2722
2723 bool ieee80211_cs_list_valid(const struct ieee80211_cipher_scheme *cs, int n)
2724 {
2725 int i;
2726
2727 /* Ensure we have enough iftype bitmap space for all iftype values */
2728 WARN_ON((NUM_NL80211_IFTYPES / 8 + 1) > sizeof(cs[0].iftype));
2729
2730 for (i = 0; i < n; i++)
2731 if (!ieee80211_cs_valid(&cs[i]))
2732 return false;
2733
2734 return true;
2735 }
2736
2737 const struct ieee80211_cipher_scheme *
2738 ieee80211_cs_get(struct ieee80211_local *local, u32 cipher,
2739 enum nl80211_iftype iftype)
2740 {
2741 const struct ieee80211_cipher_scheme *l = local->hw.cipher_schemes;
2742 int n = local->hw.n_cipher_schemes;
2743 int i;
2744 const struct ieee80211_cipher_scheme *cs = NULL;
2745
2746 for (i = 0; i < n; i++) {
2747 if (l[i].cipher == cipher) {
2748 cs = &l[i];
2749 break;
2750 }
2751 }
2752
2753 if (!cs || !(cs->iftype & BIT(iftype)))
2754 return NULL;
2755
2756 return cs;
2757 }
2758
2759 int ieee80211_cs_headroom(struct ieee80211_local *local,
2760 struct cfg80211_crypto_settings *crypto,
2761 enum nl80211_iftype iftype)
2762 {
2763 const struct ieee80211_cipher_scheme *cs;
2764 int headroom = IEEE80211_ENCRYPT_HEADROOM;
2765 int i;
2766
2767 for (i = 0; i < crypto->n_ciphers_pairwise; i++) {
2768 cs = ieee80211_cs_get(local, crypto->ciphers_pairwise[i],
2769 iftype);
2770
2771 if (cs && headroom < cs->hdr_len)
2772 headroom = cs->hdr_len;
2773 }
2774
2775 cs = ieee80211_cs_get(local, crypto->cipher_group, iftype);
2776 if (cs && headroom < cs->hdr_len)
2777 headroom = cs->hdr_len;
2778
2779 return headroom;
2780 }
2781
2782 static bool
2783 ieee80211_extend_noa_desc(struct ieee80211_noa_data *data, u32 tsf, int i)
2784 {
2785 s32 end = data->desc[i].start + data->desc[i].duration - (tsf + 1);
2786 int skip;
2787
2788 if (end > 0)
2789 return false;
2790
2791 /* End time is in the past, check for repetitions */
2792 skip = DIV_ROUND_UP(-end, data->desc[i].interval);
2793 if (data->count[i] < 255) {
2794 if (data->count[i] <= skip) {
2795 data->count[i] = 0;
2796 return false;
2797 }
2798
2799 data->count[i] -= skip;
2800 }
2801
2802 data->desc[i].start += skip * data->desc[i].interval;
2803
2804 return true;
2805 }
2806
2807 static bool
2808 ieee80211_extend_absent_time(struct ieee80211_noa_data *data, u32 tsf,
2809 s32 *offset)
2810 {
2811 bool ret = false;
2812 int i;
2813
2814 for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2815 s32 cur;
2816
2817 if (!data->count[i])
2818 continue;
2819
2820 if (ieee80211_extend_noa_desc(data, tsf + *offset, i))
2821 ret = true;
2822
2823 cur = data->desc[i].start - tsf;
2824 if (cur > *offset)
2825 continue;
2826
2827 cur = data->desc[i].start + data->desc[i].duration - tsf;
2828 if (cur > *offset)
2829 *offset = cur;
2830 }
2831
2832 return ret;
2833 }
2834
2835 static u32
2836 ieee80211_get_noa_absent_time(struct ieee80211_noa_data *data, u32 tsf)
2837 {
2838 s32 offset = 0;
2839 int tries = 0;
2840 /*
2841 * arbitrary limit, used to avoid infinite loops when combined NoA
2842 * descriptors cover the full time period.
2843 */
2844 int max_tries = 5;
2845
2846 ieee80211_extend_absent_time(data, tsf, &offset);
2847 do {
2848 if (!ieee80211_extend_absent_time(data, tsf, &offset))
2849 break;
2850
2851 tries++;
2852 } while (tries < max_tries);
2853
2854 return offset;
2855 }
2856
2857 void ieee80211_update_p2p_noa(struct ieee80211_noa_data *data, u32 tsf)
2858 {
2859 u32 next_offset = BIT(31) - 1;
2860 int i;
2861
2862 data->absent = 0;
2863 data->has_next_tsf = false;
2864 for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2865 s32 start;
2866
2867 if (!data->count[i])
2868 continue;
2869
2870 ieee80211_extend_noa_desc(data, tsf, i);
2871 start = data->desc[i].start - tsf;
2872 if (start <= 0)
2873 data->absent |= BIT(i);
2874
2875 if (next_offset > start)
2876 next_offset = start;
2877
2878 data->has_next_tsf = true;
2879 }
2880
2881 if (data->absent)
2882 next_offset = ieee80211_get_noa_absent_time(data, tsf);
2883
2884 data->next_tsf = tsf + next_offset;
2885 }
2886 EXPORT_SYMBOL(ieee80211_update_p2p_noa);
2887
2888 int ieee80211_parse_p2p_noa(const struct ieee80211_p2p_noa_attr *attr,
2889 struct ieee80211_noa_data *data, u32 tsf)
2890 {
2891 int ret = 0;
2892 int i;
2893
2894 memset(data, 0, sizeof(*data));
2895
2896 for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2897 const struct ieee80211_p2p_noa_desc *desc = &attr->desc[i];
2898
2899 if (!desc->count || !desc->duration)
2900 continue;
2901
2902 data->count[i] = desc->count;
2903 data->desc[i].start = le32_to_cpu(desc->start_time);
2904 data->desc[i].duration = le32_to_cpu(desc->duration);
2905 data->desc[i].interval = le32_to_cpu(desc->interval);
2906
2907 if (data->count[i] > 1 &&
2908 data->desc[i].interval < data->desc[i].duration)
2909 continue;
2910
2911 ieee80211_extend_noa_desc(data, tsf, i);
2912 ret++;
2913 }
2914
2915 if (ret)
2916 ieee80211_update_p2p_noa(data, tsf);
2917
2918 return ret;
2919 }
2920 EXPORT_SYMBOL(ieee80211_parse_p2p_noa);
2921
2922 void ieee80211_recalc_dtim(struct ieee80211_local *local,
2923 struct ieee80211_sub_if_data *sdata)
2924 {
2925 u64 tsf = drv_get_tsf(local, sdata);
2926 u64 dtim_count = 0;
2927 u16 beacon_int = sdata->vif.bss_conf.beacon_int * 1024;
2928 u8 dtim_period = sdata->vif.bss_conf.dtim_period;
2929 struct ps_data *ps;
2930 u8 bcns_from_dtim;
2931
2932 if (tsf == -1ULL || !beacon_int || !dtim_period)
2933 return;
2934
2935 if (sdata->vif.type == NL80211_IFTYPE_AP ||
2936 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
2937 if (!sdata->bss)
2938 return;
2939
2940 ps = &sdata->bss->ps;
2941 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2942 ps = &sdata->u.mesh.ps;
2943 } else {
2944 return;
2945 }
2946
2947 /*
2948 * actually finds last dtim_count, mac80211 will update in
2949 * __beacon_add_tim().
2950 * dtim_count = dtim_period - (tsf / bcn_int) % dtim_period
2951 */
2952 do_div(tsf, beacon_int);
2953 bcns_from_dtim = do_div(tsf, dtim_period);
2954 /* just had a DTIM */
2955 if (!bcns_from_dtim)
2956 dtim_count = 0;
2957 else
2958 dtim_count = dtim_period - bcns_from_dtim;
2959
2960 ps->dtim_count = dtim_count;
2961 }
2962
2963 static u8 ieee80211_chanctx_radar_detect(struct ieee80211_local *local,
2964 struct ieee80211_chanctx *ctx)
2965 {
2966 struct ieee80211_sub_if_data *sdata;
2967 u8 radar_detect = 0;
2968
2969 lockdep_assert_held(&local->chanctx_mtx);
2970
2971 if (WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED))
2972 return 0;
2973
2974 list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
2975 if (sdata->reserved_radar_required)
2976 radar_detect |= BIT(sdata->reserved_chandef.width);
2977
2978 /*
2979 * An in-place reservation context should not have any assigned vifs
2980 * until it replaces the other context.
2981 */
2982 WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER &&
2983 !list_empty(&ctx->assigned_vifs));
2984
2985 list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
2986 if (sdata->radar_required)
2987 radar_detect |= BIT(sdata->vif.bss_conf.chandef.width);
2988
2989 return radar_detect;
2990 }
2991
2992 int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
2993 const struct cfg80211_chan_def *chandef,
2994 enum ieee80211_chanctx_mode chanmode,
2995 u8 radar_detect)
2996 {
2997 struct ieee80211_local *local = sdata->local;
2998 struct ieee80211_sub_if_data *sdata_iter;
2999 enum nl80211_iftype iftype = sdata->wdev.iftype;
3000 int num[NUM_NL80211_IFTYPES];
3001 struct ieee80211_chanctx *ctx;
3002 int num_different_channels = 0;
3003 int total = 1;
3004
3005 lockdep_assert_held(&local->chanctx_mtx);
3006
3007 if (WARN_ON(hweight32(radar_detect) > 1))
3008 return -EINVAL;
3009
3010 if (WARN_ON(chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3011 !chandef->chan))
3012 return -EINVAL;
3013
3014 if (chandef)
3015 num_different_channels = 1;
3016
3017 if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
3018 return -EINVAL;
3019
3020 /* Always allow software iftypes */
3021 if (local->hw.wiphy->software_iftypes & BIT(iftype)) {
3022 if (radar_detect)
3023 return -EINVAL;
3024 return 0;
3025 }
3026
3027 memset(num, 0, sizeof(num));
3028
3029 if (iftype != NL80211_IFTYPE_UNSPECIFIED)
3030 num[iftype] = 1;
3031
3032 list_for_each_entry(ctx, &local->chanctx_list, list) {
3033 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3034 continue;
3035 radar_detect |= ieee80211_chanctx_radar_detect(local, ctx);
3036 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) {
3037 num_different_channels++;
3038 continue;
3039 }
3040 if (chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3041 cfg80211_chandef_compatible(chandef,
3042 &ctx->conf.def))
3043 continue;
3044 num_different_channels++;
3045 }
3046
3047 list_for_each_entry_rcu(sdata_iter, &local->interfaces, list) {
3048 struct wireless_dev *wdev_iter;
3049
3050 wdev_iter = &sdata_iter->wdev;
3051
3052 if (sdata_iter == sdata ||
3053 rcu_access_pointer(sdata_iter->vif.chanctx_conf) == NULL ||
3054 local->hw.wiphy->software_iftypes & BIT(wdev_iter->iftype))
3055 continue;
3056
3057 num[wdev_iter->iftype]++;
3058 total++;
3059 }
3060
3061 if (total == 1 && !radar_detect)
3062 return 0;
3063
3064 return cfg80211_check_combinations(local->hw.wiphy,
3065 num_different_channels,
3066 radar_detect, num);
3067 }
3068
3069 static void
3070 ieee80211_iter_max_chans(const struct ieee80211_iface_combination *c,
3071 void *data)
3072 {
3073 u32 *max_num_different_channels = data;
3074
3075 *max_num_different_channels = max(*max_num_different_channels,
3076 c->num_different_channels);
3077 }
3078
3079 int ieee80211_max_num_channels(struct ieee80211_local *local)
3080 {
3081 struct ieee80211_sub_if_data *sdata;
3082 int num[NUM_NL80211_IFTYPES] = {};
3083 struct ieee80211_chanctx *ctx;
3084 int num_different_channels = 0;
3085 u8 radar_detect = 0;
3086 u32 max_num_different_channels = 1;
3087 int err;
3088
3089 lockdep_assert_held(&local->chanctx_mtx);
3090
3091 list_for_each_entry(ctx, &local->chanctx_list, list) {
3092 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3093 continue;
3094
3095 num_different_channels++;
3096
3097 radar_detect |= ieee80211_chanctx_radar_detect(local, ctx);
3098 }
3099
3100 list_for_each_entry_rcu(sdata, &local->interfaces, list)
3101 num[sdata->wdev.iftype]++;
3102
3103 err = cfg80211_iter_combinations(local->hw.wiphy,
3104 num_different_channels, radar_detect,
3105 num, ieee80211_iter_max_chans,
3106 &max_num_different_channels);
3107 if (err < 0)
3108 return err;
3109
3110 return max_num_different_channels;
3111 }
3112
3113 u8 *ieee80211_add_wmm_info_ie(u8 *buf, u8 qosinfo)
3114 {
3115 *buf++ = WLAN_EID_VENDOR_SPECIFIC;
3116 *buf++ = 7; /* len */
3117 *buf++ = 0x00; /* Microsoft OUI 00:50:F2 */
3118 *buf++ = 0x50;
3119 *buf++ = 0xf2;
3120 *buf++ = 2; /* WME */
3121 *buf++ = 0; /* WME info */
3122 *buf++ = 1; /* WME ver */
3123 *buf++ = qosinfo; /* U-APSD no in use */
3124
3125 return buf;
3126 }
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