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1/*
2 * This file contains helper code to handle channel
3 * settings and keeping track of what is possible at
4 * any point in time.
5 *
6 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
7 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 */
9
10#include <linux/export.h>
11#include <net/cfg80211.h>
12#include "core.h"
13#include "rdev-ops.h"
14
15void cfg80211_chandef_create(struct cfg80211_chan_def *chandef,
16 struct ieee80211_channel *chan,
17 enum nl80211_channel_type chan_type)
18{
19 if (WARN_ON(!chan))
20 return;
21
22 chandef->chan = chan;
23 chandef->center_freq2 = 0;
24
25 switch (chan_type) {
26 case NL80211_CHAN_NO_HT:
27 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
28 chandef->center_freq1 = chan->center_freq;
29 break;
30 case NL80211_CHAN_HT20:
31 chandef->width = NL80211_CHAN_WIDTH_20;
32 chandef->center_freq1 = chan->center_freq;
33 break;
34 case NL80211_CHAN_HT40PLUS:
35 chandef->width = NL80211_CHAN_WIDTH_40;
36 chandef->center_freq1 = chan->center_freq + 10;
37 break;
38 case NL80211_CHAN_HT40MINUS:
39 chandef->width = NL80211_CHAN_WIDTH_40;
40 chandef->center_freq1 = chan->center_freq - 10;
41 break;
42 default:
43 WARN_ON(1);
44 }
45}
46EXPORT_SYMBOL(cfg80211_chandef_create);
47
48bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef)
49{
50 u32 control_freq;
51
52 if (!chandef->chan)
53 return false;
54
55 control_freq = chandef->chan->center_freq;
56
57 switch (chandef->width) {
58 case NL80211_CHAN_WIDTH_5:
59 case NL80211_CHAN_WIDTH_10:
60 case NL80211_CHAN_WIDTH_20:
61 case NL80211_CHAN_WIDTH_20_NOHT:
62 if (chandef->center_freq1 != control_freq)
63 return false;
64 if (chandef->center_freq2)
65 return false;
66 break;
67 case NL80211_CHAN_WIDTH_40:
68 if (chandef->center_freq1 != control_freq + 10 &&
69 chandef->center_freq1 != control_freq - 10)
70 return false;
71 if (chandef->center_freq2)
72 return false;
73 break;
74 case NL80211_CHAN_WIDTH_80P80:
75 if (chandef->center_freq1 != control_freq + 30 &&
76 chandef->center_freq1 != control_freq + 10 &&
77 chandef->center_freq1 != control_freq - 10 &&
78 chandef->center_freq1 != control_freq - 30)
79 return false;
80 if (!chandef->center_freq2)
81 return false;
82 /* adjacent is not allowed -- that's a 160 MHz channel */
83 if (chandef->center_freq1 - chandef->center_freq2 == 80 ||
84 chandef->center_freq2 - chandef->center_freq1 == 80)
85 return false;
86 break;
87 case NL80211_CHAN_WIDTH_80:
88 if (chandef->center_freq1 != control_freq + 30 &&
89 chandef->center_freq1 != control_freq + 10 &&
90 chandef->center_freq1 != control_freq - 10 &&
91 chandef->center_freq1 != control_freq - 30)
92 return false;
93 if (chandef->center_freq2)
94 return false;
95 break;
96 case NL80211_CHAN_WIDTH_160:
97 if (chandef->center_freq1 != control_freq + 70 &&
98 chandef->center_freq1 != control_freq + 50 &&
99 chandef->center_freq1 != control_freq + 30 &&
100 chandef->center_freq1 != control_freq + 10 &&
101 chandef->center_freq1 != control_freq - 10 &&
102 chandef->center_freq1 != control_freq - 30 &&
103 chandef->center_freq1 != control_freq - 50 &&
104 chandef->center_freq1 != control_freq - 70)
105 return false;
106 if (chandef->center_freq2)
107 return false;
108 break;
109 default:
110 return false;
111 }
112
113 return true;
114}
115EXPORT_SYMBOL(cfg80211_chandef_valid);
116
117static void chandef_primary_freqs(const struct cfg80211_chan_def *c,
118 u32 *pri40, u32 *pri80)
119{
120 int tmp;
121
122 switch (c->width) {
123 case NL80211_CHAN_WIDTH_40:
124 *pri40 = c->center_freq1;
125 *pri80 = 0;
126 break;
127 case NL80211_CHAN_WIDTH_80:
128 case NL80211_CHAN_WIDTH_80P80:
129 *pri80 = c->center_freq1;
130 /* n_P20 */
131 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
132 /* n_P40 */
133 tmp /= 2;
134 /* freq_P40 */
135 *pri40 = c->center_freq1 - 20 + 40 * tmp;
136 break;
137 case NL80211_CHAN_WIDTH_160:
138 /* n_P20 */
139 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
140 /* n_P40 */
141 tmp /= 2;
142 /* freq_P40 */
143 *pri40 = c->center_freq1 - 60 + 40 * tmp;
144 /* n_P80 */
145 tmp /= 2;
146 *pri80 = c->center_freq1 - 40 + 80 * tmp;
147 break;
148 default:
149 WARN_ON_ONCE(1);
150 }
151}
152
153static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c)
154{
155 int width;
156
157 switch (c->width) {
158 case NL80211_CHAN_WIDTH_5:
159 width = 5;
160 break;
161 case NL80211_CHAN_WIDTH_10:
162 width = 10;
163 break;
164 case NL80211_CHAN_WIDTH_20:
165 case NL80211_CHAN_WIDTH_20_NOHT:
166 width = 20;
167 break;
168 case NL80211_CHAN_WIDTH_40:
169 width = 40;
170 break;
171 case NL80211_CHAN_WIDTH_80P80:
172 case NL80211_CHAN_WIDTH_80:
173 width = 80;
174 break;
175 case NL80211_CHAN_WIDTH_160:
176 width = 160;
177 break;
178 default:
179 WARN_ON_ONCE(1);
180 return -1;
181 }
182 return width;
183}
184
185const struct cfg80211_chan_def *
186cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
187 const struct cfg80211_chan_def *c2)
188{
189 u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80;
190
191 /* If they are identical, return */
192 if (cfg80211_chandef_identical(c1, c2))
193 return c1;
194
195 /* otherwise, must have same control channel */
196 if (c1->chan != c2->chan)
197 return NULL;
198
199 /*
200 * If they have the same width, but aren't identical,
201 * then they can't be compatible.
202 */
203 if (c1->width == c2->width)
204 return NULL;
205
206 /*
207 * can't be compatible if one of them is 5 or 10 MHz,
208 * but they don't have the same width.
209 */
210 if (c1->width == NL80211_CHAN_WIDTH_5 ||
211 c1->width == NL80211_CHAN_WIDTH_10 ||
212 c2->width == NL80211_CHAN_WIDTH_5 ||
213 c2->width == NL80211_CHAN_WIDTH_10)
214 return NULL;
215
216 if (c1->width == NL80211_CHAN_WIDTH_20_NOHT ||
217 c1->width == NL80211_CHAN_WIDTH_20)
218 return c2;
219
220 if (c2->width == NL80211_CHAN_WIDTH_20_NOHT ||
221 c2->width == NL80211_CHAN_WIDTH_20)
222 return c1;
223
224 chandef_primary_freqs(c1, &c1_pri40, &c1_pri80);
225 chandef_primary_freqs(c2, &c2_pri40, &c2_pri80);
226
227 if (c1_pri40 != c2_pri40)
228 return NULL;
229
230 WARN_ON(!c1_pri80 && !c2_pri80);
231 if (c1_pri80 && c2_pri80 && c1_pri80 != c2_pri80)
232 return NULL;
233
234 if (c1->width > c2->width)
235 return c1;
236 return c2;
237}
238EXPORT_SYMBOL(cfg80211_chandef_compatible);
239
240static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq,
241 u32 bandwidth,
242 enum nl80211_dfs_state dfs_state)
243{
244 struct ieee80211_channel *c;
245 u32 freq;
246
247 for (freq = center_freq - bandwidth/2 + 10;
248 freq <= center_freq + bandwidth/2 - 10;
249 freq += 20) {
250 c = ieee80211_get_channel(wiphy, freq);
251 if (!c || !(c->flags & IEEE80211_CHAN_RADAR))
252 continue;
253
254 c->dfs_state = dfs_state;
255 c->dfs_state_entered = jiffies;
256 }
257}
258
259void cfg80211_set_dfs_state(struct wiphy *wiphy,
260 const struct cfg80211_chan_def *chandef,
261 enum nl80211_dfs_state dfs_state)
262{
263 int width;
264
265 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
266 return;
267
268 width = cfg80211_chandef_get_width(chandef);
269 if (width < 0)
270 return;
271
272 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1,
273 width, dfs_state);
274
275 if (!chandef->center_freq2)
276 return;
277 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2,
278 width, dfs_state);
279}
280
281static u32 cfg80211_get_start_freq(u32 center_freq,
282 u32 bandwidth)
283{
284 u32 start_freq;
285
286 if (bandwidth <= 20)
287 start_freq = center_freq;
288 else
289 start_freq = center_freq - bandwidth/2 + 10;
290
291 return start_freq;
292}
293
294static u32 cfg80211_get_end_freq(u32 center_freq,
295 u32 bandwidth)
296{
297 u32 end_freq;
298
299 if (bandwidth <= 20)
300 end_freq = center_freq;
301 else
302 end_freq = center_freq + bandwidth/2 - 10;
303
304 return end_freq;
305}
306
307static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy,
308 u32 center_freq,
309 u32 bandwidth)
310{
311 struct ieee80211_channel *c;
312 u32 freq, start_freq, end_freq;
313
314 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
315 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
316
317 for (freq = start_freq; freq <= end_freq; freq += 20) {
318 c = ieee80211_get_channel(wiphy, freq);
319 if (!c)
320 return -EINVAL;
321
322 if (c->flags & IEEE80211_CHAN_RADAR)
323 return 1;
324 }
325 return 0;
326}
327
328
329int cfg80211_chandef_dfs_required(struct wiphy *wiphy,
330 const struct cfg80211_chan_def *chandef,
331 enum nl80211_iftype iftype)
332{
333 int width;
334 int ret;
335
336 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
337 return -EINVAL;
338
339 switch (iftype) {
340 case NL80211_IFTYPE_ADHOC:
341 case NL80211_IFTYPE_AP:
342 case NL80211_IFTYPE_P2P_GO:
343 case NL80211_IFTYPE_MESH_POINT:
344 width = cfg80211_chandef_get_width(chandef);
345 if (width < 0)
346 return -EINVAL;
347
348 ret = cfg80211_get_chans_dfs_required(wiphy,
349 chandef->center_freq1,
350 width);
351 if (ret < 0)
352 return ret;
353 else if (ret > 0)
354 return BIT(chandef->width);
355
356 if (!chandef->center_freq2)
357 return 0;
358
359 ret = cfg80211_get_chans_dfs_required(wiphy,
360 chandef->center_freq2,
361 width);
362 if (ret < 0)
363 return ret;
364 else if (ret > 0)
365 return BIT(chandef->width);
366
367 break;
368 case NL80211_IFTYPE_STATION:
369 case NL80211_IFTYPE_OCB:
370 case NL80211_IFTYPE_P2P_CLIENT:
371 case NL80211_IFTYPE_MONITOR:
372 case NL80211_IFTYPE_AP_VLAN:
373 case NL80211_IFTYPE_WDS:
374 case NL80211_IFTYPE_P2P_DEVICE:
375 case NL80211_IFTYPE_NAN:
376 break;
377 case NL80211_IFTYPE_UNSPECIFIED:
378 case NUM_NL80211_IFTYPES:
379 WARN_ON(1);
380 }
381
382 return 0;
383}
384EXPORT_SYMBOL(cfg80211_chandef_dfs_required);
385
386static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy,
387 u32 center_freq,
388 u32 bandwidth)
389{
390 struct ieee80211_channel *c;
391 u32 freq, start_freq, end_freq;
392 int count = 0;
393
394 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
395 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
396
397 /*
398 * Check entire range of channels for the bandwidth.
399 * Check all channels are DFS channels (DFS_USABLE or
400 * DFS_AVAILABLE). Return number of usable channels
401 * (require CAC). Allow DFS and non-DFS channel mix.
402 */
403 for (freq = start_freq; freq <= end_freq; freq += 20) {
404 c = ieee80211_get_channel(wiphy, freq);
405 if (!c)
406 return -EINVAL;
407
408 if (c->flags & IEEE80211_CHAN_DISABLED)
409 return -EINVAL;
410
411 if (c->flags & IEEE80211_CHAN_RADAR) {
412 if (c->dfs_state == NL80211_DFS_UNAVAILABLE)
413 return -EINVAL;
414
415 if (c->dfs_state == NL80211_DFS_USABLE)
416 count++;
417 }
418 }
419
420 return count;
421}
422
423bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
424 const struct cfg80211_chan_def *chandef)
425{
426 int width;
427 int r1, r2 = 0;
428
429 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
430 return false;
431
432 width = cfg80211_chandef_get_width(chandef);
433 if (width < 0)
434 return false;
435
436 r1 = cfg80211_get_chans_dfs_usable(wiphy, chandef->center_freq1,
437 width);
438
439 if (r1 < 0)
440 return false;
441
442 switch (chandef->width) {
443 case NL80211_CHAN_WIDTH_80P80:
444 WARN_ON(!chandef->center_freq2);
445 r2 = cfg80211_get_chans_dfs_usable(wiphy,
446 chandef->center_freq2,
447 width);
448 if (r2 < 0)
449 return false;
450 break;
451 default:
452 WARN_ON(chandef->center_freq2);
453 break;
454 }
455
456 return (r1 + r2 > 0);
457}
458
459
460static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy,
461 u32 center_freq,
462 u32 bandwidth)
463{
464 struct ieee80211_channel *c;
465 u32 freq, start_freq, end_freq;
466
467 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
468 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
469
470 /*
471 * Check entire range of channels for the bandwidth.
472 * If any channel in between is disabled or has not
473 * had gone through CAC return false
474 */
475 for (freq = start_freq; freq <= end_freq; freq += 20) {
476 c = ieee80211_get_channel(wiphy, freq);
477 if (!c)
478 return false;
479
480 if (c->flags & IEEE80211_CHAN_DISABLED)
481 return false;
482
483 if ((c->flags & IEEE80211_CHAN_RADAR) &&
484 (c->dfs_state != NL80211_DFS_AVAILABLE))
485 return false;
486 }
487
488 return true;
489}
490
491static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy,
492 const struct cfg80211_chan_def *chandef)
493{
494 int width;
495 int r;
496
497 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
498 return false;
499
500 width = cfg80211_chandef_get_width(chandef);
501 if (width < 0)
502 return false;
503
504 r = cfg80211_get_chans_dfs_available(wiphy, chandef->center_freq1,
505 width);
506
507 /* If any of channels unavailable for cf1 just return */
508 if (!r)
509 return r;
510
511 switch (chandef->width) {
512 case NL80211_CHAN_WIDTH_80P80:
513 WARN_ON(!chandef->center_freq2);
514 r = cfg80211_get_chans_dfs_available(wiphy,
515 chandef->center_freq2,
516 width);
517 break;
518 default:
519 WARN_ON(chandef->center_freq2);
520 break;
521 }
522
523 return r;
524}
525
526static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy,
527 u32 center_freq,
528 u32 bandwidth)
529{
530 struct ieee80211_channel *c;
531 u32 start_freq, end_freq, freq;
532 unsigned int dfs_cac_ms = 0;
533
534 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
535 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
536
537 for (freq = start_freq; freq <= end_freq; freq += 20) {
538 c = ieee80211_get_channel(wiphy, freq);
539 if (!c)
540 return 0;
541
542 if (c->flags & IEEE80211_CHAN_DISABLED)
543 return 0;
544
545 if (!(c->flags & IEEE80211_CHAN_RADAR))
546 continue;
547
548 if (c->dfs_cac_ms > dfs_cac_ms)
549 dfs_cac_ms = c->dfs_cac_ms;
550 }
551
552 return dfs_cac_ms;
553}
554
555unsigned int
556cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
557 const struct cfg80211_chan_def *chandef)
558{
559 int width;
560 unsigned int t1 = 0, t2 = 0;
561
562 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
563 return 0;
564
565 width = cfg80211_chandef_get_width(chandef);
566 if (width < 0)
567 return 0;
568
569 t1 = cfg80211_get_chans_dfs_cac_time(wiphy,
570 chandef->center_freq1,
571 width);
572
573 if (!chandef->center_freq2)
574 return t1;
575
576 t2 = cfg80211_get_chans_dfs_cac_time(wiphy,
577 chandef->center_freq2,
578 width);
579
580 return max(t1, t2);
581}
582
583static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
584 u32 center_freq, u32 bandwidth,
585 u32 prohibited_flags)
586{
587 struct ieee80211_channel *c;
588 u32 freq, start_freq, end_freq;
589
590 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
591 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
592
593 for (freq = start_freq; freq <= end_freq; freq += 20) {
594 c = ieee80211_get_channel(wiphy, freq);
595 if (!c || c->flags & prohibited_flags)
596 return false;
597 }
598
599 return true;
600}
601
602bool cfg80211_chandef_usable(struct wiphy *wiphy,
603 const struct cfg80211_chan_def *chandef,
604 u32 prohibited_flags)
605{
606 struct ieee80211_sta_ht_cap *ht_cap;
607 struct ieee80211_sta_vht_cap *vht_cap;
608 u32 width, control_freq, cap;
609
610 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
611 return false;
612
613 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap;
614 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap;
615
616 control_freq = chandef->chan->center_freq;
617
618 switch (chandef->width) {
619 case NL80211_CHAN_WIDTH_5:
620 width = 5;
621 break;
622 case NL80211_CHAN_WIDTH_10:
623 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ;
624 width = 10;
625 break;
626 case NL80211_CHAN_WIDTH_20:
627 if (!ht_cap->ht_supported)
628 return false;
629 case NL80211_CHAN_WIDTH_20_NOHT:
630 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ;
631 width = 20;
632 break;
633 case NL80211_CHAN_WIDTH_40:
634 width = 40;
635 if (!ht_cap->ht_supported)
636 return false;
637 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
638 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
639 return false;
640 if (chandef->center_freq1 < control_freq &&
641 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
642 return false;
643 if (chandef->center_freq1 > control_freq &&
644 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
645 return false;
646 break;
647 case NL80211_CHAN_WIDTH_80P80:
648 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
649 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
650 return false;
651 case NL80211_CHAN_WIDTH_80:
652 if (!vht_cap->vht_supported)
653 return false;
654 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ;
655 width = 80;
656 break;
657 case NL80211_CHAN_WIDTH_160:
658 if (!vht_cap->vht_supported)
659 return false;
660 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
661 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
662 cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
663 return false;
664 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ;
665 width = 160;
666 break;
667 default:
668 WARN_ON_ONCE(1);
669 return false;
670 }
671
672 /*
673 * TODO: What if there are only certain 80/160/80+80 MHz channels
674 * allowed by the driver, or only certain combinations?
675 * For 40 MHz the driver can set the NO_HT40 flags, but for
676 * 80/160 MHz and in particular 80+80 MHz this isn't really
677 * feasible and we only have NO_80MHZ/NO_160MHZ so far but
678 * no way to cover 80+80 MHz or more complex restrictions.
679 * Note that such restrictions also need to be advertised to
680 * userspace, for example for P2P channel selection.
681 */
682
683 if (width > 20)
684 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
685
686 /* 5 and 10 MHz are only defined for the OFDM PHY */
687 if (width < 20)
688 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
689
690
691 if (!cfg80211_secondary_chans_ok(wiphy, chandef->center_freq1,
692 width, prohibited_flags))
693 return false;
694
695 if (!chandef->center_freq2)
696 return true;
697 return cfg80211_secondary_chans_ok(wiphy, chandef->center_freq2,
698 width, prohibited_flags);
699}
700EXPORT_SYMBOL(cfg80211_chandef_usable);
701
702/*
703 * Check if the channel can be used under permissive conditions mandated by
704 * some regulatory bodies, i.e., the channel is marked with
705 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface
706 * associated to an AP on the same channel or on the same UNII band
707 * (assuming that the AP is an authorized master).
708 * In addition allow operation on a channel on which indoor operation is
709 * allowed, iff we are currently operating in an indoor environment.
710 */
711static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy,
712 enum nl80211_iftype iftype,
713 struct ieee80211_channel *chan)
714{
715 struct wireless_dev *wdev;
716 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
717
718 ASSERT_RTNL();
719
720 if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) ||
721 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR))
722 return false;
723
724 /* only valid for GO and TDLS off-channel (station/p2p-CL) */
725 if (iftype != NL80211_IFTYPE_P2P_GO &&
726 iftype != NL80211_IFTYPE_STATION &&
727 iftype != NL80211_IFTYPE_P2P_CLIENT)
728 return false;
729
730 if (regulatory_indoor_allowed() &&
731 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
732 return true;
733
734 if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT))
735 return false;
736
737 /*
738 * Generally, it is possible to rely on another device/driver to allow
739 * the IR concurrent relaxation, however, since the device can further
740 * enforce the relaxation (by doing a similar verifications as this),
741 * and thus fail the GO instantiation, consider only the interfaces of
742 * the current registered device.
743 */
744 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
745 struct ieee80211_channel *other_chan = NULL;
746 int r1, r2;
747
748 wdev_lock(wdev);
749 if (wdev->iftype == NL80211_IFTYPE_STATION &&
750 wdev->current_bss)
751 other_chan = wdev->current_bss->pub.channel;
752
753 /*
754 * If a GO already operates on the same GO_CONCURRENT channel,
755 * this one (maybe the same one) can beacon as well. We allow
756 * the operation even if the station we relied on with
757 * GO_CONCURRENT is disconnected now. But then we must make sure
758 * we're not outdoor on an indoor-only channel.
759 */
760 if (iftype == NL80211_IFTYPE_P2P_GO &&
761 wdev->iftype == NL80211_IFTYPE_P2P_GO &&
762 wdev->beacon_interval &&
763 !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
764 other_chan = wdev->chandef.chan;
765 wdev_unlock(wdev);
766
767 if (!other_chan)
768 continue;
769
770 if (chan == other_chan)
771 return true;
772
773 if (chan->band != NL80211_BAND_5GHZ)
774 continue;
775
776 r1 = cfg80211_get_unii(chan->center_freq);
777 r2 = cfg80211_get_unii(other_chan->center_freq);
778
779 if (r1 != -EINVAL && r1 == r2) {
780 /*
781 * At some locations channels 149-165 are considered a
782 * bundle, but at other locations, e.g., Indonesia,
783 * channels 149-161 are considered a bundle while
784 * channel 165 is left out and considered to be in a
785 * different bundle. Thus, in case that there is a
786 * station interface connected to an AP on channel 165,
787 * it is assumed that channels 149-161 are allowed for
788 * GO operations. However, having a station interface
789 * connected to an AP on channels 149-161, does not
790 * allow GO operation on channel 165.
791 */
792 if (chan->center_freq == 5825 &&
793 other_chan->center_freq != 5825)
794 continue;
795 return true;
796 }
797 }
798
799 return false;
800}
801
802static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy,
803 struct cfg80211_chan_def *chandef,
804 enum nl80211_iftype iftype,
805 bool check_no_ir)
806{
807 bool res;
808 u32 prohibited_flags = IEEE80211_CHAN_DISABLED |
809 IEEE80211_CHAN_RADAR;
810
811 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
812
813 if (check_no_ir)
814 prohibited_flags |= IEEE80211_CHAN_NO_IR;
815
816 if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 &&
817 cfg80211_chandef_dfs_available(wiphy, chandef)) {
818 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */
819 prohibited_flags = IEEE80211_CHAN_DISABLED;
820 }
821
822 res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags);
823
824 trace_cfg80211_return_bool(res);
825 return res;
826}
827
828bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
829 struct cfg80211_chan_def *chandef,
830 enum nl80211_iftype iftype)
831{
832 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true);
833}
834EXPORT_SYMBOL(cfg80211_reg_can_beacon);
835
836bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy,
837 struct cfg80211_chan_def *chandef,
838 enum nl80211_iftype iftype)
839{
840 bool check_no_ir;
841
842 ASSERT_RTNL();
843
844 /*
845 * Under certain conditions suggested by some regulatory bodies a
846 * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag
847 * only if such relaxations are not enabled and the conditions are not
848 * met.
849 */
850 check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype,
851 chandef->chan);
852
853 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
854}
855EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax);
856
857int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
858 struct cfg80211_chan_def *chandef)
859{
860 if (!rdev->ops->set_monitor_channel)
861 return -EOPNOTSUPP;
862 if (!cfg80211_has_monitors_only(rdev))
863 return -EBUSY;
864
865 return rdev_set_monitor_channel(rdev, chandef);
866}
867
868void
869cfg80211_get_chan_state(struct wireless_dev *wdev,
870 struct ieee80211_channel **chan,
871 enum cfg80211_chan_mode *chanmode,
872 u8 *radar_detect)
873{
874 int ret;
875
876 *chan = NULL;
877 *chanmode = CHAN_MODE_UNDEFINED;
878
879 ASSERT_WDEV_LOCK(wdev);
880
881 if (wdev->netdev && !netif_running(wdev->netdev))
882 return;
883
884 switch (wdev->iftype) {
885 case NL80211_IFTYPE_ADHOC:
886 if (wdev->current_bss) {
887 *chan = wdev->current_bss->pub.channel;
888 *chanmode = (wdev->ibss_fixed &&
889 !wdev->ibss_dfs_possible)
890 ? CHAN_MODE_SHARED
891 : CHAN_MODE_EXCLUSIVE;
892
893 /* consider worst-case - IBSS can try to return to the
894 * original user-specified channel as creator */
895 if (wdev->ibss_dfs_possible)
896 *radar_detect |= BIT(wdev->chandef.width);
897 return;
898 }
899 break;
900 case NL80211_IFTYPE_STATION:
901 case NL80211_IFTYPE_P2P_CLIENT:
902 if (wdev->current_bss) {
903 *chan = wdev->current_bss->pub.channel;
904 *chanmode = CHAN_MODE_SHARED;
905 return;
906 }
907 break;
908 case NL80211_IFTYPE_AP:
909 case NL80211_IFTYPE_P2P_GO:
910 if (wdev->cac_started) {
911 *chan = wdev->chandef.chan;
912 *chanmode = CHAN_MODE_SHARED;
913 *radar_detect |= BIT(wdev->chandef.width);
914 } else if (wdev->beacon_interval) {
915 *chan = wdev->chandef.chan;
916 *chanmode = CHAN_MODE_SHARED;
917
918 ret = cfg80211_chandef_dfs_required(wdev->wiphy,
919 &wdev->chandef,
920 wdev->iftype);
921 WARN_ON(ret < 0);
922 if (ret > 0)
923 *radar_detect |= BIT(wdev->chandef.width);
924 }
925 return;
926 case NL80211_IFTYPE_MESH_POINT:
927 if (wdev->mesh_id_len) {
928 *chan = wdev->chandef.chan;
929 *chanmode = CHAN_MODE_SHARED;
930
931 ret = cfg80211_chandef_dfs_required(wdev->wiphy,
932 &wdev->chandef,
933 wdev->iftype);
934 WARN_ON(ret < 0);
935 if (ret > 0)
936 *radar_detect |= BIT(wdev->chandef.width);
937 }
938 return;
939 case NL80211_IFTYPE_OCB:
940 if (wdev->chandef.chan) {
941 *chan = wdev->chandef.chan;
942 *chanmode = CHAN_MODE_SHARED;
943 return;
944 }
945 break;
946 case NL80211_IFTYPE_MONITOR:
947 case NL80211_IFTYPE_AP_VLAN:
948 case NL80211_IFTYPE_WDS:
949 case NL80211_IFTYPE_P2P_DEVICE:
950 case NL80211_IFTYPE_NAN:
951 /* these interface types don't really have a channel */
952 return;
953 case NL80211_IFTYPE_UNSPECIFIED:
954 case NUM_NL80211_IFTYPES:
955 WARN_ON(1);
956 }
957}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * This file contains helper code to handle channel
4 * settings and keeping track of what is possible at
5 * any point in time.
6 *
7 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
8 * Copyright 2013-2014 Intel Mobile Communications GmbH
9 * Copyright 2018-2020 Intel Corporation
10 */
11
12#include <linux/export.h>
13#include <linux/bitfield.h>
14#include <net/cfg80211.h>
15#include "core.h"
16#include "rdev-ops.h"
17
18static bool cfg80211_valid_60g_freq(u32 freq)
19{
20 return freq >= 58320 && freq <= 70200;
21}
22
23void cfg80211_chandef_create(struct cfg80211_chan_def *chandef,
24 struct ieee80211_channel *chan,
25 enum nl80211_channel_type chan_type)
26{
27 if (WARN_ON(!chan))
28 return;
29
30 chandef->chan = chan;
31 chandef->freq1_offset = chan->freq_offset;
32 chandef->center_freq2 = 0;
33 chandef->edmg.bw_config = 0;
34 chandef->edmg.channels = 0;
35
36 switch (chan_type) {
37 case NL80211_CHAN_NO_HT:
38 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
39 chandef->center_freq1 = chan->center_freq;
40 break;
41 case NL80211_CHAN_HT20:
42 chandef->width = NL80211_CHAN_WIDTH_20;
43 chandef->center_freq1 = chan->center_freq;
44 break;
45 case NL80211_CHAN_HT40PLUS:
46 chandef->width = NL80211_CHAN_WIDTH_40;
47 chandef->center_freq1 = chan->center_freq + 10;
48 break;
49 case NL80211_CHAN_HT40MINUS:
50 chandef->width = NL80211_CHAN_WIDTH_40;
51 chandef->center_freq1 = chan->center_freq - 10;
52 break;
53 default:
54 WARN_ON(1);
55 }
56}
57EXPORT_SYMBOL(cfg80211_chandef_create);
58
59static bool cfg80211_edmg_chandef_valid(const struct cfg80211_chan_def *chandef)
60{
61 int max_contiguous = 0;
62 int num_of_enabled = 0;
63 int contiguous = 0;
64 int i;
65
66 if (!chandef->edmg.channels || !chandef->edmg.bw_config)
67 return false;
68
69 if (!cfg80211_valid_60g_freq(chandef->chan->center_freq))
70 return false;
71
72 for (i = 0; i < 6; i++) {
73 if (chandef->edmg.channels & BIT(i)) {
74 contiguous++;
75 num_of_enabled++;
76 } else {
77 contiguous = 0;
78 }
79
80 max_contiguous = max(contiguous, max_contiguous);
81 }
82 /* basic verification of edmg configuration according to
83 * IEEE P802.11ay/D4.0 section 9.4.2.251
84 */
85 /* check bw_config against contiguous edmg channels */
86 switch (chandef->edmg.bw_config) {
87 case IEEE80211_EDMG_BW_CONFIG_4:
88 case IEEE80211_EDMG_BW_CONFIG_8:
89 case IEEE80211_EDMG_BW_CONFIG_12:
90 if (max_contiguous < 1)
91 return false;
92 break;
93 case IEEE80211_EDMG_BW_CONFIG_5:
94 case IEEE80211_EDMG_BW_CONFIG_9:
95 case IEEE80211_EDMG_BW_CONFIG_13:
96 if (max_contiguous < 2)
97 return false;
98 break;
99 case IEEE80211_EDMG_BW_CONFIG_6:
100 case IEEE80211_EDMG_BW_CONFIG_10:
101 case IEEE80211_EDMG_BW_CONFIG_14:
102 if (max_contiguous < 3)
103 return false;
104 break;
105 case IEEE80211_EDMG_BW_CONFIG_7:
106 case IEEE80211_EDMG_BW_CONFIG_11:
107 case IEEE80211_EDMG_BW_CONFIG_15:
108 if (max_contiguous < 4)
109 return false;
110 break;
111
112 default:
113 return false;
114 }
115
116 /* check bw_config against aggregated (non contiguous) edmg channels */
117 switch (chandef->edmg.bw_config) {
118 case IEEE80211_EDMG_BW_CONFIG_4:
119 case IEEE80211_EDMG_BW_CONFIG_5:
120 case IEEE80211_EDMG_BW_CONFIG_6:
121 case IEEE80211_EDMG_BW_CONFIG_7:
122 break;
123 case IEEE80211_EDMG_BW_CONFIG_8:
124 case IEEE80211_EDMG_BW_CONFIG_9:
125 case IEEE80211_EDMG_BW_CONFIG_10:
126 case IEEE80211_EDMG_BW_CONFIG_11:
127 if (num_of_enabled < 2)
128 return false;
129 break;
130 case IEEE80211_EDMG_BW_CONFIG_12:
131 case IEEE80211_EDMG_BW_CONFIG_13:
132 case IEEE80211_EDMG_BW_CONFIG_14:
133 case IEEE80211_EDMG_BW_CONFIG_15:
134 if (num_of_enabled < 4 || max_contiguous < 2)
135 return false;
136 break;
137 default:
138 return false;
139 }
140
141 return true;
142}
143
144bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef)
145{
146 u32 control_freq;
147
148 if (!chandef->chan)
149 return false;
150
151 if (chandef->freq1_offset >= 1000)
152 return false;
153
154 control_freq = chandef->chan->center_freq;
155
156 switch (chandef->width) {
157 case NL80211_CHAN_WIDTH_1:
158 case NL80211_CHAN_WIDTH_2:
159 case NL80211_CHAN_WIDTH_4:
160 case NL80211_CHAN_WIDTH_8:
161 case NL80211_CHAN_WIDTH_16:
162 case NL80211_CHAN_WIDTH_5:
163 case NL80211_CHAN_WIDTH_10:
164 case NL80211_CHAN_WIDTH_20:
165 case NL80211_CHAN_WIDTH_20_NOHT:
166 if (ieee80211_chandef_to_khz(chandef) !=
167 ieee80211_channel_to_khz(chandef->chan))
168 return false;
169 if (chandef->center_freq2)
170 return false;
171 break;
172 case NL80211_CHAN_WIDTH_40:
173 if (chandef->center_freq1 != control_freq + 10 &&
174 chandef->center_freq1 != control_freq - 10)
175 return false;
176 if (chandef->center_freq2)
177 return false;
178 break;
179 case NL80211_CHAN_WIDTH_80P80:
180 if (chandef->center_freq1 != control_freq + 30 &&
181 chandef->center_freq1 != control_freq + 10 &&
182 chandef->center_freq1 != control_freq - 10 &&
183 chandef->center_freq1 != control_freq - 30)
184 return false;
185 if (!chandef->center_freq2)
186 return false;
187 /* adjacent is not allowed -- that's a 160 MHz channel */
188 if (chandef->center_freq1 - chandef->center_freq2 == 80 ||
189 chandef->center_freq2 - chandef->center_freq1 == 80)
190 return false;
191 break;
192 case NL80211_CHAN_WIDTH_80:
193 if (chandef->center_freq1 != control_freq + 30 &&
194 chandef->center_freq1 != control_freq + 10 &&
195 chandef->center_freq1 != control_freq - 10 &&
196 chandef->center_freq1 != control_freq - 30)
197 return false;
198 if (chandef->center_freq2)
199 return false;
200 break;
201 case NL80211_CHAN_WIDTH_160:
202 if (chandef->center_freq1 != control_freq + 70 &&
203 chandef->center_freq1 != control_freq + 50 &&
204 chandef->center_freq1 != control_freq + 30 &&
205 chandef->center_freq1 != control_freq + 10 &&
206 chandef->center_freq1 != control_freq - 10 &&
207 chandef->center_freq1 != control_freq - 30 &&
208 chandef->center_freq1 != control_freq - 50 &&
209 chandef->center_freq1 != control_freq - 70)
210 return false;
211 if (chandef->center_freq2)
212 return false;
213 break;
214 default:
215 return false;
216 }
217
218 /* channel 14 is only for IEEE 802.11b */
219 if (chandef->center_freq1 == 2484 &&
220 chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
221 return false;
222
223 if (cfg80211_chandef_is_edmg(chandef) &&
224 !cfg80211_edmg_chandef_valid(chandef))
225 return false;
226
227 return true;
228}
229EXPORT_SYMBOL(cfg80211_chandef_valid);
230
231static void chandef_primary_freqs(const struct cfg80211_chan_def *c,
232 u32 *pri40, u32 *pri80)
233{
234 int tmp;
235
236 switch (c->width) {
237 case NL80211_CHAN_WIDTH_40:
238 *pri40 = c->center_freq1;
239 *pri80 = 0;
240 break;
241 case NL80211_CHAN_WIDTH_80:
242 case NL80211_CHAN_WIDTH_80P80:
243 *pri80 = c->center_freq1;
244 /* n_P20 */
245 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
246 /* n_P40 */
247 tmp /= 2;
248 /* freq_P40 */
249 *pri40 = c->center_freq1 - 20 + 40 * tmp;
250 break;
251 case NL80211_CHAN_WIDTH_160:
252 /* n_P20 */
253 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
254 /* n_P40 */
255 tmp /= 2;
256 /* freq_P40 */
257 *pri40 = c->center_freq1 - 60 + 40 * tmp;
258 /* n_P80 */
259 tmp /= 2;
260 *pri80 = c->center_freq1 - 40 + 80 * tmp;
261 break;
262 default:
263 WARN_ON_ONCE(1);
264 }
265}
266
267static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c)
268{
269 int width;
270
271 switch (c->width) {
272 case NL80211_CHAN_WIDTH_1:
273 width = 1;
274 break;
275 case NL80211_CHAN_WIDTH_2:
276 width = 2;
277 break;
278 case NL80211_CHAN_WIDTH_4:
279 width = 4;
280 break;
281 case NL80211_CHAN_WIDTH_8:
282 width = 8;
283 break;
284 case NL80211_CHAN_WIDTH_16:
285 width = 16;
286 break;
287 case NL80211_CHAN_WIDTH_5:
288 width = 5;
289 break;
290 case NL80211_CHAN_WIDTH_10:
291 width = 10;
292 break;
293 case NL80211_CHAN_WIDTH_20:
294 case NL80211_CHAN_WIDTH_20_NOHT:
295 width = 20;
296 break;
297 case NL80211_CHAN_WIDTH_40:
298 width = 40;
299 break;
300 case NL80211_CHAN_WIDTH_80P80:
301 case NL80211_CHAN_WIDTH_80:
302 width = 80;
303 break;
304 case NL80211_CHAN_WIDTH_160:
305 width = 160;
306 break;
307 default:
308 WARN_ON_ONCE(1);
309 return -1;
310 }
311 return width;
312}
313
314const struct cfg80211_chan_def *
315cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
316 const struct cfg80211_chan_def *c2)
317{
318 u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80;
319
320 /* If they are identical, return */
321 if (cfg80211_chandef_identical(c1, c2))
322 return c1;
323
324 /* otherwise, must have same control channel */
325 if (c1->chan != c2->chan)
326 return NULL;
327
328 /*
329 * If they have the same width, but aren't identical,
330 * then they can't be compatible.
331 */
332 if (c1->width == c2->width)
333 return NULL;
334
335 /*
336 * can't be compatible if one of them is 5 or 10 MHz,
337 * but they don't have the same width.
338 */
339 if (c1->width == NL80211_CHAN_WIDTH_5 ||
340 c1->width == NL80211_CHAN_WIDTH_10 ||
341 c2->width == NL80211_CHAN_WIDTH_5 ||
342 c2->width == NL80211_CHAN_WIDTH_10)
343 return NULL;
344
345 if (c1->width == NL80211_CHAN_WIDTH_20_NOHT ||
346 c1->width == NL80211_CHAN_WIDTH_20)
347 return c2;
348
349 if (c2->width == NL80211_CHAN_WIDTH_20_NOHT ||
350 c2->width == NL80211_CHAN_WIDTH_20)
351 return c1;
352
353 chandef_primary_freqs(c1, &c1_pri40, &c1_pri80);
354 chandef_primary_freqs(c2, &c2_pri40, &c2_pri80);
355
356 if (c1_pri40 != c2_pri40)
357 return NULL;
358
359 WARN_ON(!c1_pri80 && !c2_pri80);
360 if (c1_pri80 && c2_pri80 && c1_pri80 != c2_pri80)
361 return NULL;
362
363 if (c1->width > c2->width)
364 return c1;
365 return c2;
366}
367EXPORT_SYMBOL(cfg80211_chandef_compatible);
368
369static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq,
370 u32 bandwidth,
371 enum nl80211_dfs_state dfs_state)
372{
373 struct ieee80211_channel *c;
374 u32 freq;
375
376 for (freq = center_freq - bandwidth/2 + 10;
377 freq <= center_freq + bandwidth/2 - 10;
378 freq += 20) {
379 c = ieee80211_get_channel(wiphy, freq);
380 if (!c || !(c->flags & IEEE80211_CHAN_RADAR))
381 continue;
382
383 c->dfs_state = dfs_state;
384 c->dfs_state_entered = jiffies;
385 }
386}
387
388void cfg80211_set_dfs_state(struct wiphy *wiphy,
389 const struct cfg80211_chan_def *chandef,
390 enum nl80211_dfs_state dfs_state)
391{
392 int width;
393
394 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
395 return;
396
397 width = cfg80211_chandef_get_width(chandef);
398 if (width < 0)
399 return;
400
401 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1,
402 width, dfs_state);
403
404 if (!chandef->center_freq2)
405 return;
406 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2,
407 width, dfs_state);
408}
409
410static u32 cfg80211_get_start_freq(u32 center_freq,
411 u32 bandwidth)
412{
413 u32 start_freq;
414
415 bandwidth = MHZ_TO_KHZ(bandwidth);
416 if (bandwidth <= MHZ_TO_KHZ(20))
417 start_freq = center_freq;
418 else
419 start_freq = center_freq - bandwidth / 2 + MHZ_TO_KHZ(10);
420
421 return start_freq;
422}
423
424static u32 cfg80211_get_end_freq(u32 center_freq,
425 u32 bandwidth)
426{
427 u32 end_freq;
428
429 bandwidth = MHZ_TO_KHZ(bandwidth);
430 if (bandwidth <= MHZ_TO_KHZ(20))
431 end_freq = center_freq;
432 else
433 end_freq = center_freq + bandwidth / 2 - MHZ_TO_KHZ(10);
434
435 return end_freq;
436}
437
438static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy,
439 u32 center_freq,
440 u32 bandwidth)
441{
442 struct ieee80211_channel *c;
443 u32 freq, start_freq, end_freq;
444
445 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
446 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
447
448 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
449 c = ieee80211_get_channel_khz(wiphy, freq);
450 if (!c)
451 return -EINVAL;
452
453 if (c->flags & IEEE80211_CHAN_RADAR)
454 return 1;
455 }
456 return 0;
457}
458
459
460int cfg80211_chandef_dfs_required(struct wiphy *wiphy,
461 const struct cfg80211_chan_def *chandef,
462 enum nl80211_iftype iftype)
463{
464 int width;
465 int ret;
466
467 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
468 return -EINVAL;
469
470 switch (iftype) {
471 case NL80211_IFTYPE_ADHOC:
472 case NL80211_IFTYPE_AP:
473 case NL80211_IFTYPE_P2P_GO:
474 case NL80211_IFTYPE_MESH_POINT:
475 width = cfg80211_chandef_get_width(chandef);
476 if (width < 0)
477 return -EINVAL;
478
479 ret = cfg80211_get_chans_dfs_required(wiphy,
480 ieee80211_chandef_to_khz(chandef),
481 width);
482 if (ret < 0)
483 return ret;
484 else if (ret > 0)
485 return BIT(chandef->width);
486
487 if (!chandef->center_freq2)
488 return 0;
489
490 ret = cfg80211_get_chans_dfs_required(wiphy,
491 MHZ_TO_KHZ(chandef->center_freq2),
492 width);
493 if (ret < 0)
494 return ret;
495 else if (ret > 0)
496 return BIT(chandef->width);
497
498 break;
499 case NL80211_IFTYPE_STATION:
500 case NL80211_IFTYPE_OCB:
501 case NL80211_IFTYPE_P2P_CLIENT:
502 case NL80211_IFTYPE_MONITOR:
503 case NL80211_IFTYPE_AP_VLAN:
504 case NL80211_IFTYPE_WDS:
505 case NL80211_IFTYPE_P2P_DEVICE:
506 case NL80211_IFTYPE_NAN:
507 break;
508 case NL80211_IFTYPE_UNSPECIFIED:
509 case NUM_NL80211_IFTYPES:
510 WARN_ON(1);
511 }
512
513 return 0;
514}
515EXPORT_SYMBOL(cfg80211_chandef_dfs_required);
516
517static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy,
518 u32 center_freq,
519 u32 bandwidth)
520{
521 struct ieee80211_channel *c;
522 u32 freq, start_freq, end_freq;
523 int count = 0;
524
525 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
526 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
527
528 /*
529 * Check entire range of channels for the bandwidth.
530 * Check all channels are DFS channels (DFS_USABLE or
531 * DFS_AVAILABLE). Return number of usable channels
532 * (require CAC). Allow DFS and non-DFS channel mix.
533 */
534 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
535 c = ieee80211_get_channel_khz(wiphy, freq);
536 if (!c)
537 return -EINVAL;
538
539 if (c->flags & IEEE80211_CHAN_DISABLED)
540 return -EINVAL;
541
542 if (c->flags & IEEE80211_CHAN_RADAR) {
543 if (c->dfs_state == NL80211_DFS_UNAVAILABLE)
544 return -EINVAL;
545
546 if (c->dfs_state == NL80211_DFS_USABLE)
547 count++;
548 }
549 }
550
551 return count;
552}
553
554bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
555 const struct cfg80211_chan_def *chandef)
556{
557 int width;
558 int r1, r2 = 0;
559
560 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
561 return false;
562
563 width = cfg80211_chandef_get_width(chandef);
564 if (width < 0)
565 return false;
566
567 r1 = cfg80211_get_chans_dfs_usable(wiphy,
568 MHZ_TO_KHZ(chandef->center_freq1),
569 width);
570
571 if (r1 < 0)
572 return false;
573
574 switch (chandef->width) {
575 case NL80211_CHAN_WIDTH_80P80:
576 WARN_ON(!chandef->center_freq2);
577 r2 = cfg80211_get_chans_dfs_usable(wiphy,
578 MHZ_TO_KHZ(chandef->center_freq2),
579 width);
580 if (r2 < 0)
581 return false;
582 break;
583 default:
584 WARN_ON(chandef->center_freq2);
585 break;
586 }
587
588 return (r1 + r2 > 0);
589}
590
591/*
592 * Checks if center frequency of chan falls with in the bandwidth
593 * range of chandef.
594 */
595bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef,
596 struct ieee80211_channel *chan)
597{
598 int width;
599 u32 freq;
600
601 if (chandef->chan->center_freq == chan->center_freq)
602 return true;
603
604 width = cfg80211_chandef_get_width(chandef);
605 if (width <= 20)
606 return false;
607
608 for (freq = chandef->center_freq1 - width / 2 + 10;
609 freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) {
610 if (chan->center_freq == freq)
611 return true;
612 }
613
614 if (!chandef->center_freq2)
615 return false;
616
617 for (freq = chandef->center_freq2 - width / 2 + 10;
618 freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) {
619 if (chan->center_freq == freq)
620 return true;
621 }
622
623 return false;
624}
625
626bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev)
627{
628 bool active = false;
629
630 ASSERT_WDEV_LOCK(wdev);
631
632 if (!wdev->chandef.chan)
633 return false;
634
635 switch (wdev->iftype) {
636 case NL80211_IFTYPE_AP:
637 case NL80211_IFTYPE_P2P_GO:
638 active = wdev->beacon_interval != 0;
639 break;
640 case NL80211_IFTYPE_ADHOC:
641 active = wdev->ssid_len != 0;
642 break;
643 case NL80211_IFTYPE_MESH_POINT:
644 active = wdev->mesh_id_len != 0;
645 break;
646 case NL80211_IFTYPE_STATION:
647 case NL80211_IFTYPE_OCB:
648 case NL80211_IFTYPE_P2P_CLIENT:
649 case NL80211_IFTYPE_MONITOR:
650 case NL80211_IFTYPE_AP_VLAN:
651 case NL80211_IFTYPE_WDS:
652 case NL80211_IFTYPE_P2P_DEVICE:
653 /* Can NAN type be considered as beaconing interface? */
654 case NL80211_IFTYPE_NAN:
655 break;
656 case NL80211_IFTYPE_UNSPECIFIED:
657 case NUM_NL80211_IFTYPES:
658 WARN_ON(1);
659 }
660
661 return active;
662}
663
664static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy,
665 struct ieee80211_channel *chan)
666{
667 struct wireless_dev *wdev;
668
669 list_for_each_entry(wdev, &wiphy->wdev_list, list) {
670 wdev_lock(wdev);
671 if (!cfg80211_beaconing_iface_active(wdev)) {
672 wdev_unlock(wdev);
673 continue;
674 }
675
676 if (cfg80211_is_sub_chan(&wdev->chandef, chan)) {
677 wdev_unlock(wdev);
678 return true;
679 }
680 wdev_unlock(wdev);
681 }
682
683 return false;
684}
685
686bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy,
687 struct ieee80211_channel *chan)
688{
689 struct cfg80211_registered_device *rdev;
690
691 ASSERT_RTNL();
692
693 if (!(chan->flags & IEEE80211_CHAN_RADAR))
694 return false;
695
696 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
697 if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))
698 continue;
699
700 if (cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan))
701 return true;
702 }
703
704 return false;
705}
706
707static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy,
708 u32 center_freq,
709 u32 bandwidth)
710{
711 struct ieee80211_channel *c;
712 u32 freq, start_freq, end_freq;
713 bool dfs_offload;
714
715 dfs_offload = wiphy_ext_feature_isset(wiphy,
716 NL80211_EXT_FEATURE_DFS_OFFLOAD);
717
718 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
719 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
720
721 /*
722 * Check entire range of channels for the bandwidth.
723 * If any channel in between is disabled or has not
724 * had gone through CAC return false
725 */
726 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
727 c = ieee80211_get_channel_khz(wiphy, freq);
728 if (!c)
729 return false;
730
731 if (c->flags & IEEE80211_CHAN_DISABLED)
732 return false;
733
734 if ((c->flags & IEEE80211_CHAN_RADAR) &&
735 (c->dfs_state != NL80211_DFS_AVAILABLE) &&
736 !(c->dfs_state == NL80211_DFS_USABLE && dfs_offload))
737 return false;
738 }
739
740 return true;
741}
742
743static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy,
744 const struct cfg80211_chan_def *chandef)
745{
746 int width;
747 int r;
748
749 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
750 return false;
751
752 width = cfg80211_chandef_get_width(chandef);
753 if (width < 0)
754 return false;
755
756 r = cfg80211_get_chans_dfs_available(wiphy,
757 MHZ_TO_KHZ(chandef->center_freq1),
758 width);
759
760 /* If any of channels unavailable for cf1 just return */
761 if (!r)
762 return r;
763
764 switch (chandef->width) {
765 case NL80211_CHAN_WIDTH_80P80:
766 WARN_ON(!chandef->center_freq2);
767 r = cfg80211_get_chans_dfs_available(wiphy,
768 MHZ_TO_KHZ(chandef->center_freq2),
769 width);
770 break;
771 default:
772 WARN_ON(chandef->center_freq2);
773 break;
774 }
775
776 return r;
777}
778
779static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy,
780 u32 center_freq,
781 u32 bandwidth)
782{
783 struct ieee80211_channel *c;
784 u32 start_freq, end_freq, freq;
785 unsigned int dfs_cac_ms = 0;
786
787 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
788 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
789
790 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
791 c = ieee80211_get_channel_khz(wiphy, freq);
792 if (!c)
793 return 0;
794
795 if (c->flags & IEEE80211_CHAN_DISABLED)
796 return 0;
797
798 if (!(c->flags & IEEE80211_CHAN_RADAR))
799 continue;
800
801 if (c->dfs_cac_ms > dfs_cac_ms)
802 dfs_cac_ms = c->dfs_cac_ms;
803 }
804
805 return dfs_cac_ms;
806}
807
808unsigned int
809cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
810 const struct cfg80211_chan_def *chandef)
811{
812 int width;
813 unsigned int t1 = 0, t2 = 0;
814
815 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
816 return 0;
817
818 width = cfg80211_chandef_get_width(chandef);
819 if (width < 0)
820 return 0;
821
822 t1 = cfg80211_get_chans_dfs_cac_time(wiphy,
823 MHZ_TO_KHZ(chandef->center_freq1),
824 width);
825
826 if (!chandef->center_freq2)
827 return t1;
828
829 t2 = cfg80211_get_chans_dfs_cac_time(wiphy,
830 MHZ_TO_KHZ(chandef->center_freq2),
831 width);
832
833 return max(t1, t2);
834}
835
836static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
837 u32 center_freq, u32 bandwidth,
838 u32 prohibited_flags)
839{
840 struct ieee80211_channel *c;
841 u32 freq, start_freq, end_freq;
842
843 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
844 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
845
846 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
847 c = ieee80211_get_channel_khz(wiphy, freq);
848 if (!c || c->flags & prohibited_flags)
849 return false;
850 }
851
852 return true;
853}
854
855/* check if the operating channels are valid and supported */
856static bool cfg80211_edmg_usable(struct wiphy *wiphy, u8 edmg_channels,
857 enum ieee80211_edmg_bw_config edmg_bw_config,
858 int primary_channel,
859 struct ieee80211_edmg *edmg_cap)
860{
861 struct ieee80211_channel *chan;
862 int i, freq;
863 int channels_counter = 0;
864
865 if (!edmg_channels && !edmg_bw_config)
866 return true;
867
868 if ((!edmg_channels && edmg_bw_config) ||
869 (edmg_channels && !edmg_bw_config))
870 return false;
871
872 if (!(edmg_channels & BIT(primary_channel - 1)))
873 return false;
874
875 /* 60GHz channels 1..6 */
876 for (i = 0; i < 6; i++) {
877 if (!(edmg_channels & BIT(i)))
878 continue;
879
880 if (!(edmg_cap->channels & BIT(i)))
881 return false;
882
883 channels_counter++;
884
885 freq = ieee80211_channel_to_frequency(i + 1,
886 NL80211_BAND_60GHZ);
887 chan = ieee80211_get_channel(wiphy, freq);
888 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
889 return false;
890 }
891
892 /* IEEE802.11 allows max 4 channels */
893 if (channels_counter > 4)
894 return false;
895
896 /* check bw_config is a subset of what driver supports
897 * (see IEEE P802.11ay/D4.0 section 9.4.2.251, Table 13)
898 */
899 if ((edmg_bw_config % 4) > (edmg_cap->bw_config % 4))
900 return false;
901
902 if (edmg_bw_config > edmg_cap->bw_config)
903 return false;
904
905 return true;
906}
907
908bool cfg80211_chandef_usable(struct wiphy *wiphy,
909 const struct cfg80211_chan_def *chandef,
910 u32 prohibited_flags)
911{
912 struct ieee80211_sta_ht_cap *ht_cap;
913 struct ieee80211_sta_vht_cap *vht_cap;
914 struct ieee80211_edmg *edmg_cap;
915 u32 width, control_freq, cap;
916 bool support_80_80 = false;
917
918 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
919 return false;
920
921 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap;
922 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap;
923 edmg_cap = &wiphy->bands[chandef->chan->band]->edmg_cap;
924
925 if (edmg_cap->channels &&
926 !cfg80211_edmg_usable(wiphy,
927 chandef->edmg.channels,
928 chandef->edmg.bw_config,
929 chandef->chan->hw_value,
930 edmg_cap))
931 return false;
932
933 control_freq = chandef->chan->center_freq;
934
935 switch (chandef->width) {
936 case NL80211_CHAN_WIDTH_1:
937 width = 1;
938 break;
939 case NL80211_CHAN_WIDTH_2:
940 width = 2;
941 break;
942 case NL80211_CHAN_WIDTH_4:
943 width = 4;
944 break;
945 case NL80211_CHAN_WIDTH_8:
946 width = 8;
947 break;
948 case NL80211_CHAN_WIDTH_16:
949 width = 16;
950 break;
951 case NL80211_CHAN_WIDTH_5:
952 width = 5;
953 break;
954 case NL80211_CHAN_WIDTH_10:
955 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ;
956 width = 10;
957 break;
958 case NL80211_CHAN_WIDTH_20:
959 if (!ht_cap->ht_supported &&
960 chandef->chan->band != NL80211_BAND_6GHZ)
961 return false;
962 fallthrough;
963 case NL80211_CHAN_WIDTH_20_NOHT:
964 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ;
965 width = 20;
966 break;
967 case NL80211_CHAN_WIDTH_40:
968 width = 40;
969 if (chandef->chan->band == NL80211_BAND_6GHZ)
970 break;
971 if (!ht_cap->ht_supported)
972 return false;
973 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
974 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
975 return false;
976 if (chandef->center_freq1 < control_freq &&
977 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
978 return false;
979 if (chandef->center_freq1 > control_freq &&
980 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
981 return false;
982 break;
983 case NL80211_CHAN_WIDTH_80P80:
984 cap = vht_cap->cap;
985 support_80_80 =
986 (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) ||
987 (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
988 cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) ||
989 u32_get_bits(cap, IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) > 1;
990 if (chandef->chan->band != NL80211_BAND_6GHZ && !support_80_80)
991 return false;
992 fallthrough;
993 case NL80211_CHAN_WIDTH_80:
994 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ;
995 width = 80;
996 if (chandef->chan->band == NL80211_BAND_6GHZ)
997 break;
998 if (!vht_cap->vht_supported)
999 return false;
1000 break;
1001 case NL80211_CHAN_WIDTH_160:
1002 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ;
1003 width = 160;
1004 if (chandef->chan->band == NL80211_BAND_6GHZ)
1005 break;
1006 if (!vht_cap->vht_supported)
1007 return false;
1008 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
1009 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
1010 cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ &&
1011 !(vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK))
1012 return false;
1013 break;
1014 default:
1015 WARN_ON_ONCE(1);
1016 return false;
1017 }
1018
1019 /*
1020 * TODO: What if there are only certain 80/160/80+80 MHz channels
1021 * allowed by the driver, or only certain combinations?
1022 * For 40 MHz the driver can set the NO_HT40 flags, but for
1023 * 80/160 MHz and in particular 80+80 MHz this isn't really
1024 * feasible and we only have NO_80MHZ/NO_160MHZ so far but
1025 * no way to cover 80+80 MHz or more complex restrictions.
1026 * Note that such restrictions also need to be advertised to
1027 * userspace, for example for P2P channel selection.
1028 */
1029
1030 if (width > 20)
1031 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
1032
1033 /* 5 and 10 MHz are only defined for the OFDM PHY */
1034 if (width < 20)
1035 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
1036
1037
1038 if (!cfg80211_secondary_chans_ok(wiphy,
1039 ieee80211_chandef_to_khz(chandef),
1040 width, prohibited_flags))
1041 return false;
1042
1043 if (!chandef->center_freq2)
1044 return true;
1045 return cfg80211_secondary_chans_ok(wiphy,
1046 MHZ_TO_KHZ(chandef->center_freq2),
1047 width, prohibited_flags);
1048}
1049EXPORT_SYMBOL(cfg80211_chandef_usable);
1050
1051/*
1052 * Check if the channel can be used under permissive conditions mandated by
1053 * some regulatory bodies, i.e., the channel is marked with
1054 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface
1055 * associated to an AP on the same channel or on the same UNII band
1056 * (assuming that the AP is an authorized master).
1057 * In addition allow operation on a channel on which indoor operation is
1058 * allowed, iff we are currently operating in an indoor environment.
1059 */
1060static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy,
1061 enum nl80211_iftype iftype,
1062 struct ieee80211_channel *chan)
1063{
1064 struct wireless_dev *wdev;
1065 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1066
1067 ASSERT_RTNL();
1068
1069 if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) ||
1070 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR))
1071 return false;
1072
1073 /* only valid for GO and TDLS off-channel (station/p2p-CL) */
1074 if (iftype != NL80211_IFTYPE_P2P_GO &&
1075 iftype != NL80211_IFTYPE_STATION &&
1076 iftype != NL80211_IFTYPE_P2P_CLIENT)
1077 return false;
1078
1079 if (regulatory_indoor_allowed() &&
1080 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
1081 return true;
1082
1083 if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT))
1084 return false;
1085
1086 /*
1087 * Generally, it is possible to rely on another device/driver to allow
1088 * the IR concurrent relaxation, however, since the device can further
1089 * enforce the relaxation (by doing a similar verifications as this),
1090 * and thus fail the GO instantiation, consider only the interfaces of
1091 * the current registered device.
1092 */
1093 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
1094 struct ieee80211_channel *other_chan = NULL;
1095 int r1, r2;
1096
1097 wdev_lock(wdev);
1098 if (wdev->iftype == NL80211_IFTYPE_STATION &&
1099 wdev->current_bss)
1100 other_chan = wdev->current_bss->pub.channel;
1101
1102 /*
1103 * If a GO already operates on the same GO_CONCURRENT channel,
1104 * this one (maybe the same one) can beacon as well. We allow
1105 * the operation even if the station we relied on with
1106 * GO_CONCURRENT is disconnected now. But then we must make sure
1107 * we're not outdoor on an indoor-only channel.
1108 */
1109 if (iftype == NL80211_IFTYPE_P2P_GO &&
1110 wdev->iftype == NL80211_IFTYPE_P2P_GO &&
1111 wdev->beacon_interval &&
1112 !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
1113 other_chan = wdev->chandef.chan;
1114 wdev_unlock(wdev);
1115
1116 if (!other_chan)
1117 continue;
1118
1119 if (chan == other_chan)
1120 return true;
1121
1122 if (chan->band != NL80211_BAND_5GHZ &&
1123 chan->band != NL80211_BAND_6GHZ)
1124 continue;
1125
1126 r1 = cfg80211_get_unii(chan->center_freq);
1127 r2 = cfg80211_get_unii(other_chan->center_freq);
1128
1129 if (r1 != -EINVAL && r1 == r2) {
1130 /*
1131 * At some locations channels 149-165 are considered a
1132 * bundle, but at other locations, e.g., Indonesia,
1133 * channels 149-161 are considered a bundle while
1134 * channel 165 is left out and considered to be in a
1135 * different bundle. Thus, in case that there is a
1136 * station interface connected to an AP on channel 165,
1137 * it is assumed that channels 149-161 are allowed for
1138 * GO operations. However, having a station interface
1139 * connected to an AP on channels 149-161, does not
1140 * allow GO operation on channel 165.
1141 */
1142 if (chan->center_freq == 5825 &&
1143 other_chan->center_freq != 5825)
1144 continue;
1145 return true;
1146 }
1147 }
1148
1149 return false;
1150}
1151
1152static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy,
1153 struct cfg80211_chan_def *chandef,
1154 enum nl80211_iftype iftype,
1155 bool check_no_ir)
1156{
1157 bool res;
1158 u32 prohibited_flags = IEEE80211_CHAN_DISABLED |
1159 IEEE80211_CHAN_RADAR;
1160
1161 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
1162
1163 if (check_no_ir)
1164 prohibited_flags |= IEEE80211_CHAN_NO_IR;
1165
1166 if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 &&
1167 cfg80211_chandef_dfs_available(wiphy, chandef)) {
1168 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */
1169 prohibited_flags = IEEE80211_CHAN_DISABLED;
1170 }
1171
1172 res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags);
1173
1174 trace_cfg80211_return_bool(res);
1175 return res;
1176}
1177
1178bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
1179 struct cfg80211_chan_def *chandef,
1180 enum nl80211_iftype iftype)
1181{
1182 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true);
1183}
1184EXPORT_SYMBOL(cfg80211_reg_can_beacon);
1185
1186bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy,
1187 struct cfg80211_chan_def *chandef,
1188 enum nl80211_iftype iftype)
1189{
1190 bool check_no_ir;
1191
1192 ASSERT_RTNL();
1193
1194 /*
1195 * Under certain conditions suggested by some regulatory bodies a
1196 * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag
1197 * only if such relaxations are not enabled and the conditions are not
1198 * met.
1199 */
1200 check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype,
1201 chandef->chan);
1202
1203 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
1204}
1205EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax);
1206
1207int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
1208 struct cfg80211_chan_def *chandef)
1209{
1210 if (!rdev->ops->set_monitor_channel)
1211 return -EOPNOTSUPP;
1212 if (!cfg80211_has_monitors_only(rdev))
1213 return -EBUSY;
1214
1215 return rdev_set_monitor_channel(rdev, chandef);
1216}
1217
1218void
1219cfg80211_get_chan_state(struct wireless_dev *wdev,
1220 struct ieee80211_channel **chan,
1221 enum cfg80211_chan_mode *chanmode,
1222 u8 *radar_detect)
1223{
1224 int ret;
1225
1226 *chan = NULL;
1227 *chanmode = CHAN_MODE_UNDEFINED;
1228
1229 ASSERT_WDEV_LOCK(wdev);
1230
1231 if (wdev->netdev && !netif_running(wdev->netdev))
1232 return;
1233
1234 switch (wdev->iftype) {
1235 case NL80211_IFTYPE_ADHOC:
1236 if (wdev->current_bss) {
1237 *chan = wdev->current_bss->pub.channel;
1238 *chanmode = (wdev->ibss_fixed &&
1239 !wdev->ibss_dfs_possible)
1240 ? CHAN_MODE_SHARED
1241 : CHAN_MODE_EXCLUSIVE;
1242
1243 /* consider worst-case - IBSS can try to return to the
1244 * original user-specified channel as creator */
1245 if (wdev->ibss_dfs_possible)
1246 *radar_detect |= BIT(wdev->chandef.width);
1247 return;
1248 }
1249 break;
1250 case NL80211_IFTYPE_STATION:
1251 case NL80211_IFTYPE_P2P_CLIENT:
1252 if (wdev->current_bss) {
1253 *chan = wdev->current_bss->pub.channel;
1254 *chanmode = CHAN_MODE_SHARED;
1255 return;
1256 }
1257 break;
1258 case NL80211_IFTYPE_AP:
1259 case NL80211_IFTYPE_P2P_GO:
1260 if (wdev->cac_started) {
1261 *chan = wdev->chandef.chan;
1262 *chanmode = CHAN_MODE_SHARED;
1263 *radar_detect |= BIT(wdev->chandef.width);
1264 } else if (wdev->beacon_interval) {
1265 *chan = wdev->chandef.chan;
1266 *chanmode = CHAN_MODE_SHARED;
1267
1268 ret = cfg80211_chandef_dfs_required(wdev->wiphy,
1269 &wdev->chandef,
1270 wdev->iftype);
1271 WARN_ON(ret < 0);
1272 if (ret > 0)
1273 *radar_detect |= BIT(wdev->chandef.width);
1274 }
1275 return;
1276 case NL80211_IFTYPE_MESH_POINT:
1277 if (wdev->mesh_id_len) {
1278 *chan = wdev->chandef.chan;
1279 *chanmode = CHAN_MODE_SHARED;
1280
1281 ret = cfg80211_chandef_dfs_required(wdev->wiphy,
1282 &wdev->chandef,
1283 wdev->iftype);
1284 WARN_ON(ret < 0);
1285 if (ret > 0)
1286 *radar_detect |= BIT(wdev->chandef.width);
1287 }
1288 return;
1289 case NL80211_IFTYPE_OCB:
1290 if (wdev->chandef.chan) {
1291 *chan = wdev->chandef.chan;
1292 *chanmode = CHAN_MODE_SHARED;
1293 return;
1294 }
1295 break;
1296 case NL80211_IFTYPE_MONITOR:
1297 case NL80211_IFTYPE_AP_VLAN:
1298 case NL80211_IFTYPE_WDS:
1299 case NL80211_IFTYPE_P2P_DEVICE:
1300 case NL80211_IFTYPE_NAN:
1301 /* these interface types don't really have a channel */
1302 return;
1303 case NL80211_IFTYPE_UNSPECIFIED:
1304 case NUM_NL80211_IFTYPES:
1305 WARN_ON(1);
1306 }
1307}