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Merge tag '5.14-rc-smb3-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6
[mirror_ubuntu-jammy-kernel.git] / net / wireless / chan.c
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 2018-2021 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
18 static bool cfg80211_valid_60g_freq(u32 freq)
19 {
20 return freq >= 58320 && freq <= 70200;
21 }
22
23 void 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 }
57 EXPORT_SYMBOL(cfg80211_chandef_create);
58
59 static 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
144 static int nl80211_chan_width_to_mhz(enum nl80211_chan_width chan_width)
145 {
146 int mhz;
147
148 switch (chan_width) {
149 case NL80211_CHAN_WIDTH_1:
150 mhz = 1;
151 break;
152 case NL80211_CHAN_WIDTH_2:
153 mhz = 2;
154 break;
155 case NL80211_CHAN_WIDTH_4:
156 mhz = 4;
157 break;
158 case NL80211_CHAN_WIDTH_8:
159 mhz = 8;
160 break;
161 case NL80211_CHAN_WIDTH_16:
162 mhz = 16;
163 break;
164 case NL80211_CHAN_WIDTH_5:
165 mhz = 5;
166 break;
167 case NL80211_CHAN_WIDTH_10:
168 mhz = 10;
169 break;
170 case NL80211_CHAN_WIDTH_20:
171 case NL80211_CHAN_WIDTH_20_NOHT:
172 mhz = 20;
173 break;
174 case NL80211_CHAN_WIDTH_40:
175 mhz = 40;
176 break;
177 case NL80211_CHAN_WIDTH_80P80:
178 case NL80211_CHAN_WIDTH_80:
179 mhz = 80;
180 break;
181 case NL80211_CHAN_WIDTH_160:
182 mhz = 160;
183 break;
184 default:
185 WARN_ON_ONCE(1);
186 return -1;
187 }
188 return mhz;
189 }
190
191 static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c)
192 {
193 return nl80211_chan_width_to_mhz(c->width);
194 }
195
196 bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef)
197 {
198 u32 control_freq, oper_freq;
199 int oper_width, control_width;
200
201 if (!chandef->chan)
202 return false;
203
204 if (chandef->freq1_offset >= 1000)
205 return false;
206
207 control_freq = chandef->chan->center_freq;
208
209 switch (chandef->width) {
210 case NL80211_CHAN_WIDTH_5:
211 case NL80211_CHAN_WIDTH_10:
212 case NL80211_CHAN_WIDTH_20:
213 case NL80211_CHAN_WIDTH_20_NOHT:
214 if (ieee80211_chandef_to_khz(chandef) !=
215 ieee80211_channel_to_khz(chandef->chan))
216 return false;
217 if (chandef->center_freq2)
218 return false;
219 break;
220 case NL80211_CHAN_WIDTH_1:
221 case NL80211_CHAN_WIDTH_2:
222 case NL80211_CHAN_WIDTH_4:
223 case NL80211_CHAN_WIDTH_8:
224 case NL80211_CHAN_WIDTH_16:
225 if (chandef->chan->band != NL80211_BAND_S1GHZ)
226 return false;
227
228 control_freq = ieee80211_channel_to_khz(chandef->chan);
229 oper_freq = ieee80211_chandef_to_khz(chandef);
230 control_width = nl80211_chan_width_to_mhz(
231 ieee80211_s1g_channel_width(
232 chandef->chan));
233 oper_width = cfg80211_chandef_get_width(chandef);
234
235 if (oper_width < 0 || control_width < 0)
236 return false;
237 if (chandef->center_freq2)
238 return false;
239
240 if (control_freq + MHZ_TO_KHZ(control_width) / 2 >
241 oper_freq + MHZ_TO_KHZ(oper_width) / 2)
242 return false;
243
244 if (control_freq - MHZ_TO_KHZ(control_width) / 2 <
245 oper_freq - MHZ_TO_KHZ(oper_width) / 2)
246 return false;
247 break;
248 case NL80211_CHAN_WIDTH_40:
249 if (chandef->center_freq1 != control_freq + 10 &&
250 chandef->center_freq1 != control_freq - 10)
251 return false;
252 if (chandef->center_freq2)
253 return false;
254 break;
255 case NL80211_CHAN_WIDTH_80P80:
256 if (chandef->center_freq1 != control_freq + 30 &&
257 chandef->center_freq1 != control_freq + 10 &&
258 chandef->center_freq1 != control_freq - 10 &&
259 chandef->center_freq1 != control_freq - 30)
260 return false;
261 if (!chandef->center_freq2)
262 return false;
263 /* adjacent is not allowed -- that's a 160 MHz channel */
264 if (chandef->center_freq1 - chandef->center_freq2 == 80 ||
265 chandef->center_freq2 - chandef->center_freq1 == 80)
266 return false;
267 break;
268 case NL80211_CHAN_WIDTH_80:
269 if (chandef->center_freq1 != control_freq + 30 &&
270 chandef->center_freq1 != control_freq + 10 &&
271 chandef->center_freq1 != control_freq - 10 &&
272 chandef->center_freq1 != control_freq - 30)
273 return false;
274 if (chandef->center_freq2)
275 return false;
276 break;
277 case NL80211_CHAN_WIDTH_160:
278 if (chandef->center_freq1 != control_freq + 70 &&
279 chandef->center_freq1 != control_freq + 50 &&
280 chandef->center_freq1 != control_freq + 30 &&
281 chandef->center_freq1 != control_freq + 10 &&
282 chandef->center_freq1 != control_freq - 10 &&
283 chandef->center_freq1 != control_freq - 30 &&
284 chandef->center_freq1 != control_freq - 50 &&
285 chandef->center_freq1 != control_freq - 70)
286 return false;
287 if (chandef->center_freq2)
288 return false;
289 break;
290 default:
291 return false;
292 }
293
294 /* channel 14 is only for IEEE 802.11b */
295 if (chandef->center_freq1 == 2484 &&
296 chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
297 return false;
298
299 if (cfg80211_chandef_is_edmg(chandef) &&
300 !cfg80211_edmg_chandef_valid(chandef))
301 return false;
302
303 return true;
304 }
305 EXPORT_SYMBOL(cfg80211_chandef_valid);
306
307 static void chandef_primary_freqs(const struct cfg80211_chan_def *c,
308 u32 *pri40, u32 *pri80)
309 {
310 int tmp;
311
312 switch (c->width) {
313 case NL80211_CHAN_WIDTH_40:
314 *pri40 = c->center_freq1;
315 *pri80 = 0;
316 break;
317 case NL80211_CHAN_WIDTH_80:
318 case NL80211_CHAN_WIDTH_80P80:
319 *pri80 = c->center_freq1;
320 /* n_P20 */
321 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
322 /* n_P40 */
323 tmp /= 2;
324 /* freq_P40 */
325 *pri40 = c->center_freq1 - 20 + 40 * tmp;
326 break;
327 case NL80211_CHAN_WIDTH_160:
328 /* n_P20 */
329 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
330 /* n_P40 */
331 tmp /= 2;
332 /* freq_P40 */
333 *pri40 = c->center_freq1 - 60 + 40 * tmp;
334 /* n_P80 */
335 tmp /= 2;
336 *pri80 = c->center_freq1 - 40 + 80 * tmp;
337 break;
338 default:
339 WARN_ON_ONCE(1);
340 }
341 }
342
343 const struct cfg80211_chan_def *
344 cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
345 const struct cfg80211_chan_def *c2)
346 {
347 u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80;
348
349 /* If they are identical, return */
350 if (cfg80211_chandef_identical(c1, c2))
351 return c1;
352
353 /* otherwise, must have same control channel */
354 if (c1->chan != c2->chan)
355 return NULL;
356
357 /*
358 * If they have the same width, but aren't identical,
359 * then they can't be compatible.
360 */
361 if (c1->width == c2->width)
362 return NULL;
363
364 /*
365 * can't be compatible if one of them is 5 or 10 MHz,
366 * but they don't have the same width.
367 */
368 if (c1->width == NL80211_CHAN_WIDTH_5 ||
369 c1->width == NL80211_CHAN_WIDTH_10 ||
370 c2->width == NL80211_CHAN_WIDTH_5 ||
371 c2->width == NL80211_CHAN_WIDTH_10)
372 return NULL;
373
374 if (c1->width == NL80211_CHAN_WIDTH_20_NOHT ||
375 c1->width == NL80211_CHAN_WIDTH_20)
376 return c2;
377
378 if (c2->width == NL80211_CHAN_WIDTH_20_NOHT ||
379 c2->width == NL80211_CHAN_WIDTH_20)
380 return c1;
381
382 chandef_primary_freqs(c1, &c1_pri40, &c1_pri80);
383 chandef_primary_freqs(c2, &c2_pri40, &c2_pri80);
384
385 if (c1_pri40 != c2_pri40)
386 return NULL;
387
388 WARN_ON(!c1_pri80 && !c2_pri80);
389 if (c1_pri80 && c2_pri80 && c1_pri80 != c2_pri80)
390 return NULL;
391
392 if (c1->width > c2->width)
393 return c1;
394 return c2;
395 }
396 EXPORT_SYMBOL(cfg80211_chandef_compatible);
397
398 static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq,
399 u32 bandwidth,
400 enum nl80211_dfs_state dfs_state)
401 {
402 struct ieee80211_channel *c;
403 u32 freq;
404
405 for (freq = center_freq - bandwidth/2 + 10;
406 freq <= center_freq + bandwidth/2 - 10;
407 freq += 20) {
408 c = ieee80211_get_channel(wiphy, freq);
409 if (!c || !(c->flags & IEEE80211_CHAN_RADAR))
410 continue;
411
412 c->dfs_state = dfs_state;
413 c->dfs_state_entered = jiffies;
414 }
415 }
416
417 void cfg80211_set_dfs_state(struct wiphy *wiphy,
418 const struct cfg80211_chan_def *chandef,
419 enum nl80211_dfs_state dfs_state)
420 {
421 int width;
422
423 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
424 return;
425
426 width = cfg80211_chandef_get_width(chandef);
427 if (width < 0)
428 return;
429
430 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1,
431 width, dfs_state);
432
433 if (!chandef->center_freq2)
434 return;
435 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2,
436 width, dfs_state);
437 }
438
439 static u32 cfg80211_get_start_freq(u32 center_freq,
440 u32 bandwidth)
441 {
442 u32 start_freq;
443
444 bandwidth = MHZ_TO_KHZ(bandwidth);
445 if (bandwidth <= MHZ_TO_KHZ(20))
446 start_freq = center_freq;
447 else
448 start_freq = center_freq - bandwidth / 2 + MHZ_TO_KHZ(10);
449
450 return start_freq;
451 }
452
453 static u32 cfg80211_get_end_freq(u32 center_freq,
454 u32 bandwidth)
455 {
456 u32 end_freq;
457
458 bandwidth = MHZ_TO_KHZ(bandwidth);
459 if (bandwidth <= MHZ_TO_KHZ(20))
460 end_freq = center_freq;
461 else
462 end_freq = center_freq + bandwidth / 2 - MHZ_TO_KHZ(10);
463
464 return end_freq;
465 }
466
467 static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy,
468 u32 center_freq,
469 u32 bandwidth)
470 {
471 struct ieee80211_channel *c;
472 u32 freq, start_freq, end_freq;
473
474 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
475 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
476
477 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
478 c = ieee80211_get_channel_khz(wiphy, freq);
479 if (!c)
480 return -EINVAL;
481
482 if (c->flags & IEEE80211_CHAN_RADAR)
483 return 1;
484 }
485 return 0;
486 }
487
488
489 int cfg80211_chandef_dfs_required(struct wiphy *wiphy,
490 const struct cfg80211_chan_def *chandef,
491 enum nl80211_iftype iftype)
492 {
493 int width;
494 int ret;
495
496 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
497 return -EINVAL;
498
499 switch (iftype) {
500 case NL80211_IFTYPE_ADHOC:
501 case NL80211_IFTYPE_AP:
502 case NL80211_IFTYPE_P2P_GO:
503 case NL80211_IFTYPE_MESH_POINT:
504 width = cfg80211_chandef_get_width(chandef);
505 if (width < 0)
506 return -EINVAL;
507
508 ret = cfg80211_get_chans_dfs_required(wiphy,
509 ieee80211_chandef_to_khz(chandef),
510 width);
511 if (ret < 0)
512 return ret;
513 else if (ret > 0)
514 return BIT(chandef->width);
515
516 if (!chandef->center_freq2)
517 return 0;
518
519 ret = cfg80211_get_chans_dfs_required(wiphy,
520 MHZ_TO_KHZ(chandef->center_freq2),
521 width);
522 if (ret < 0)
523 return ret;
524 else if (ret > 0)
525 return BIT(chandef->width);
526
527 break;
528 case NL80211_IFTYPE_STATION:
529 case NL80211_IFTYPE_OCB:
530 case NL80211_IFTYPE_P2P_CLIENT:
531 case NL80211_IFTYPE_MONITOR:
532 case NL80211_IFTYPE_AP_VLAN:
533 case NL80211_IFTYPE_P2P_DEVICE:
534 case NL80211_IFTYPE_NAN:
535 break;
536 case NL80211_IFTYPE_WDS:
537 case NL80211_IFTYPE_UNSPECIFIED:
538 case NUM_NL80211_IFTYPES:
539 WARN_ON(1);
540 }
541
542 return 0;
543 }
544 EXPORT_SYMBOL(cfg80211_chandef_dfs_required);
545
546 static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy,
547 u32 center_freq,
548 u32 bandwidth)
549 {
550 struct ieee80211_channel *c;
551 u32 freq, start_freq, end_freq;
552 int count = 0;
553
554 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
555 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
556
557 /*
558 * Check entire range of channels for the bandwidth.
559 * Check all channels are DFS channels (DFS_USABLE or
560 * DFS_AVAILABLE). Return number of usable channels
561 * (require CAC). Allow DFS and non-DFS channel mix.
562 */
563 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
564 c = ieee80211_get_channel_khz(wiphy, freq);
565 if (!c)
566 return -EINVAL;
567
568 if (c->flags & IEEE80211_CHAN_DISABLED)
569 return -EINVAL;
570
571 if (c->flags & IEEE80211_CHAN_RADAR) {
572 if (c->dfs_state == NL80211_DFS_UNAVAILABLE)
573 return -EINVAL;
574
575 if (c->dfs_state == NL80211_DFS_USABLE)
576 count++;
577 }
578 }
579
580 return count;
581 }
582
583 bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
584 const struct cfg80211_chan_def *chandef)
585 {
586 int width;
587 int r1, r2 = 0;
588
589 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
590 return false;
591
592 width = cfg80211_chandef_get_width(chandef);
593 if (width < 0)
594 return false;
595
596 r1 = cfg80211_get_chans_dfs_usable(wiphy,
597 MHZ_TO_KHZ(chandef->center_freq1),
598 width);
599
600 if (r1 < 0)
601 return false;
602
603 switch (chandef->width) {
604 case NL80211_CHAN_WIDTH_80P80:
605 WARN_ON(!chandef->center_freq2);
606 r2 = cfg80211_get_chans_dfs_usable(wiphy,
607 MHZ_TO_KHZ(chandef->center_freq2),
608 width);
609 if (r2 < 0)
610 return false;
611 break;
612 default:
613 WARN_ON(chandef->center_freq2);
614 break;
615 }
616
617 return (r1 + r2 > 0);
618 }
619
620 /*
621 * Checks if center frequency of chan falls with in the bandwidth
622 * range of chandef.
623 */
624 bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef,
625 struct ieee80211_channel *chan)
626 {
627 int width;
628 u32 freq;
629
630 if (chandef->chan->center_freq == chan->center_freq)
631 return true;
632
633 width = cfg80211_chandef_get_width(chandef);
634 if (width <= 20)
635 return false;
636
637 for (freq = chandef->center_freq1 - width / 2 + 10;
638 freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) {
639 if (chan->center_freq == freq)
640 return true;
641 }
642
643 if (!chandef->center_freq2)
644 return false;
645
646 for (freq = chandef->center_freq2 - width / 2 + 10;
647 freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) {
648 if (chan->center_freq == freq)
649 return true;
650 }
651
652 return false;
653 }
654
655 bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev)
656 {
657 bool active = false;
658
659 ASSERT_WDEV_LOCK(wdev);
660
661 if (!wdev->chandef.chan)
662 return false;
663
664 switch (wdev->iftype) {
665 case NL80211_IFTYPE_AP:
666 case NL80211_IFTYPE_P2P_GO:
667 active = wdev->beacon_interval != 0;
668 break;
669 case NL80211_IFTYPE_ADHOC:
670 active = wdev->ssid_len != 0;
671 break;
672 case NL80211_IFTYPE_MESH_POINT:
673 active = wdev->mesh_id_len != 0;
674 break;
675 case NL80211_IFTYPE_STATION:
676 case NL80211_IFTYPE_OCB:
677 case NL80211_IFTYPE_P2P_CLIENT:
678 case NL80211_IFTYPE_MONITOR:
679 case NL80211_IFTYPE_AP_VLAN:
680 case NL80211_IFTYPE_P2P_DEVICE:
681 /* Can NAN type be considered as beaconing interface? */
682 case NL80211_IFTYPE_NAN:
683 break;
684 case NL80211_IFTYPE_UNSPECIFIED:
685 case NL80211_IFTYPE_WDS:
686 case NUM_NL80211_IFTYPES:
687 WARN_ON(1);
688 }
689
690 return active;
691 }
692
693 static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy,
694 struct ieee80211_channel *chan)
695 {
696 struct wireless_dev *wdev;
697
698 list_for_each_entry(wdev, &wiphy->wdev_list, list) {
699 wdev_lock(wdev);
700 if (!cfg80211_beaconing_iface_active(wdev)) {
701 wdev_unlock(wdev);
702 continue;
703 }
704
705 if (cfg80211_is_sub_chan(&wdev->chandef, chan)) {
706 wdev_unlock(wdev);
707 return true;
708 }
709 wdev_unlock(wdev);
710 }
711
712 return false;
713 }
714
715 bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy,
716 struct ieee80211_channel *chan)
717 {
718 struct cfg80211_registered_device *rdev;
719
720 ASSERT_RTNL();
721
722 if (!(chan->flags & IEEE80211_CHAN_RADAR))
723 return false;
724
725 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
726 if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))
727 continue;
728
729 if (cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan))
730 return true;
731 }
732
733 return false;
734 }
735
736 static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy,
737 u32 center_freq,
738 u32 bandwidth)
739 {
740 struct ieee80211_channel *c;
741 u32 freq, start_freq, end_freq;
742 bool dfs_offload;
743
744 dfs_offload = wiphy_ext_feature_isset(wiphy,
745 NL80211_EXT_FEATURE_DFS_OFFLOAD);
746
747 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
748 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
749
750 /*
751 * Check entire range of channels for the bandwidth.
752 * If any channel in between is disabled or has not
753 * had gone through CAC return false
754 */
755 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
756 c = ieee80211_get_channel_khz(wiphy, freq);
757 if (!c)
758 return false;
759
760 if (c->flags & IEEE80211_CHAN_DISABLED)
761 return false;
762
763 if ((c->flags & IEEE80211_CHAN_RADAR) &&
764 (c->dfs_state != NL80211_DFS_AVAILABLE) &&
765 !(c->dfs_state == NL80211_DFS_USABLE && dfs_offload))
766 return false;
767 }
768
769 return true;
770 }
771
772 static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy,
773 const struct cfg80211_chan_def *chandef)
774 {
775 int width;
776 int r;
777
778 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
779 return false;
780
781 width = cfg80211_chandef_get_width(chandef);
782 if (width < 0)
783 return false;
784
785 r = cfg80211_get_chans_dfs_available(wiphy,
786 MHZ_TO_KHZ(chandef->center_freq1),
787 width);
788
789 /* If any of channels unavailable for cf1 just return */
790 if (!r)
791 return r;
792
793 switch (chandef->width) {
794 case NL80211_CHAN_WIDTH_80P80:
795 WARN_ON(!chandef->center_freq2);
796 r = cfg80211_get_chans_dfs_available(wiphy,
797 MHZ_TO_KHZ(chandef->center_freq2),
798 width);
799 break;
800 default:
801 WARN_ON(chandef->center_freq2);
802 break;
803 }
804
805 return r;
806 }
807
808 static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy,
809 u32 center_freq,
810 u32 bandwidth)
811 {
812 struct ieee80211_channel *c;
813 u32 start_freq, end_freq, freq;
814 unsigned int dfs_cac_ms = 0;
815
816 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
817 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
818
819 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
820 c = ieee80211_get_channel_khz(wiphy, freq);
821 if (!c)
822 return 0;
823
824 if (c->flags & IEEE80211_CHAN_DISABLED)
825 return 0;
826
827 if (!(c->flags & IEEE80211_CHAN_RADAR))
828 continue;
829
830 if (c->dfs_cac_ms > dfs_cac_ms)
831 dfs_cac_ms = c->dfs_cac_ms;
832 }
833
834 return dfs_cac_ms;
835 }
836
837 unsigned int
838 cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
839 const struct cfg80211_chan_def *chandef)
840 {
841 int width;
842 unsigned int t1 = 0, t2 = 0;
843
844 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
845 return 0;
846
847 width = cfg80211_chandef_get_width(chandef);
848 if (width < 0)
849 return 0;
850
851 t1 = cfg80211_get_chans_dfs_cac_time(wiphy,
852 MHZ_TO_KHZ(chandef->center_freq1),
853 width);
854
855 if (!chandef->center_freq2)
856 return t1;
857
858 t2 = cfg80211_get_chans_dfs_cac_time(wiphy,
859 MHZ_TO_KHZ(chandef->center_freq2),
860 width);
861
862 return max(t1, t2);
863 }
864
865 static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
866 u32 center_freq, u32 bandwidth,
867 u32 prohibited_flags)
868 {
869 struct ieee80211_channel *c;
870 u32 freq, start_freq, end_freq;
871
872 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
873 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
874
875 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
876 c = ieee80211_get_channel_khz(wiphy, freq);
877 if (!c || c->flags & prohibited_flags)
878 return false;
879 }
880
881 return true;
882 }
883
884 /* check if the operating channels are valid and supported */
885 static bool cfg80211_edmg_usable(struct wiphy *wiphy, u8 edmg_channels,
886 enum ieee80211_edmg_bw_config edmg_bw_config,
887 int primary_channel,
888 struct ieee80211_edmg *edmg_cap)
889 {
890 struct ieee80211_channel *chan;
891 int i, freq;
892 int channels_counter = 0;
893
894 if (!edmg_channels && !edmg_bw_config)
895 return true;
896
897 if ((!edmg_channels && edmg_bw_config) ||
898 (edmg_channels && !edmg_bw_config))
899 return false;
900
901 if (!(edmg_channels & BIT(primary_channel - 1)))
902 return false;
903
904 /* 60GHz channels 1..6 */
905 for (i = 0; i < 6; i++) {
906 if (!(edmg_channels & BIT(i)))
907 continue;
908
909 if (!(edmg_cap->channels & BIT(i)))
910 return false;
911
912 channels_counter++;
913
914 freq = ieee80211_channel_to_frequency(i + 1,
915 NL80211_BAND_60GHZ);
916 chan = ieee80211_get_channel(wiphy, freq);
917 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
918 return false;
919 }
920
921 /* IEEE802.11 allows max 4 channels */
922 if (channels_counter > 4)
923 return false;
924
925 /* check bw_config is a subset of what driver supports
926 * (see IEEE P802.11ay/D4.0 section 9.4.2.251, Table 13)
927 */
928 if ((edmg_bw_config % 4) > (edmg_cap->bw_config % 4))
929 return false;
930
931 if (edmg_bw_config > edmg_cap->bw_config)
932 return false;
933
934 return true;
935 }
936
937 bool cfg80211_chandef_usable(struct wiphy *wiphy,
938 const struct cfg80211_chan_def *chandef,
939 u32 prohibited_flags)
940 {
941 struct ieee80211_sta_ht_cap *ht_cap;
942 struct ieee80211_sta_vht_cap *vht_cap;
943 struct ieee80211_edmg *edmg_cap;
944 u32 width, control_freq, cap;
945 bool ext_nss_cap, support_80_80 = false;
946
947 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
948 return false;
949
950 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap;
951 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap;
952 edmg_cap = &wiphy->bands[chandef->chan->band]->edmg_cap;
953 ext_nss_cap = __le16_to_cpu(vht_cap->vht_mcs.tx_highest) &
954 IEEE80211_VHT_EXT_NSS_BW_CAPABLE;
955
956 if (edmg_cap->channels &&
957 !cfg80211_edmg_usable(wiphy,
958 chandef->edmg.channels,
959 chandef->edmg.bw_config,
960 chandef->chan->hw_value,
961 edmg_cap))
962 return false;
963
964 control_freq = chandef->chan->center_freq;
965
966 switch (chandef->width) {
967 case NL80211_CHAN_WIDTH_1:
968 width = 1;
969 break;
970 case NL80211_CHAN_WIDTH_2:
971 width = 2;
972 break;
973 case NL80211_CHAN_WIDTH_4:
974 width = 4;
975 break;
976 case NL80211_CHAN_WIDTH_8:
977 width = 8;
978 break;
979 case NL80211_CHAN_WIDTH_16:
980 width = 16;
981 break;
982 case NL80211_CHAN_WIDTH_5:
983 width = 5;
984 break;
985 case NL80211_CHAN_WIDTH_10:
986 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ;
987 width = 10;
988 break;
989 case NL80211_CHAN_WIDTH_20:
990 if (!ht_cap->ht_supported &&
991 chandef->chan->band != NL80211_BAND_6GHZ)
992 return false;
993 fallthrough;
994 case NL80211_CHAN_WIDTH_20_NOHT:
995 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ;
996 width = 20;
997 break;
998 case NL80211_CHAN_WIDTH_40:
999 width = 40;
1000 if (chandef->chan->band == NL80211_BAND_6GHZ)
1001 break;
1002 if (!ht_cap->ht_supported)
1003 return false;
1004 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
1005 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
1006 return false;
1007 if (chandef->center_freq1 < control_freq &&
1008 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
1009 return false;
1010 if (chandef->center_freq1 > control_freq &&
1011 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
1012 return false;
1013 break;
1014 case NL80211_CHAN_WIDTH_80P80:
1015 cap = vht_cap->cap;
1016 support_80_80 =
1017 (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) ||
1018 (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
1019 cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) ||
1020 (ext_nss_cap &&
1021 u32_get_bits(cap, IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) > 1);
1022 if (chandef->chan->band != NL80211_BAND_6GHZ && !support_80_80)
1023 return false;
1024 fallthrough;
1025 case NL80211_CHAN_WIDTH_80:
1026 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ;
1027 width = 80;
1028 if (chandef->chan->band == NL80211_BAND_6GHZ)
1029 break;
1030 if (!vht_cap->vht_supported)
1031 return false;
1032 break;
1033 case NL80211_CHAN_WIDTH_160:
1034 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ;
1035 width = 160;
1036 if (chandef->chan->band == NL80211_BAND_6GHZ)
1037 break;
1038 if (!vht_cap->vht_supported)
1039 return false;
1040 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
1041 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
1042 cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ &&
1043 !(ext_nss_cap &&
1044 (vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK)))
1045 return false;
1046 break;
1047 default:
1048 WARN_ON_ONCE(1);
1049 return false;
1050 }
1051
1052 /*
1053 * TODO: What if there are only certain 80/160/80+80 MHz channels
1054 * allowed by the driver, or only certain combinations?
1055 * For 40 MHz the driver can set the NO_HT40 flags, but for
1056 * 80/160 MHz and in particular 80+80 MHz this isn't really
1057 * feasible and we only have NO_80MHZ/NO_160MHZ so far but
1058 * no way to cover 80+80 MHz or more complex restrictions.
1059 * Note that such restrictions also need to be advertised to
1060 * userspace, for example for P2P channel selection.
1061 */
1062
1063 if (width > 20)
1064 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
1065
1066 /* 5 and 10 MHz are only defined for the OFDM PHY */
1067 if (width < 20)
1068 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
1069
1070
1071 if (!cfg80211_secondary_chans_ok(wiphy,
1072 ieee80211_chandef_to_khz(chandef),
1073 width, prohibited_flags))
1074 return false;
1075
1076 if (!chandef->center_freq2)
1077 return true;
1078 return cfg80211_secondary_chans_ok(wiphy,
1079 MHZ_TO_KHZ(chandef->center_freq2),
1080 width, prohibited_flags);
1081 }
1082 EXPORT_SYMBOL(cfg80211_chandef_usable);
1083
1084 /*
1085 * Check if the channel can be used under permissive conditions mandated by
1086 * some regulatory bodies, i.e., the channel is marked with
1087 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface
1088 * associated to an AP on the same channel or on the same UNII band
1089 * (assuming that the AP is an authorized master).
1090 * In addition allow operation on a channel on which indoor operation is
1091 * allowed, iff we are currently operating in an indoor environment.
1092 */
1093 static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy,
1094 enum nl80211_iftype iftype,
1095 struct ieee80211_channel *chan)
1096 {
1097 struct wireless_dev *wdev;
1098 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1099
1100 lockdep_assert_held(&rdev->wiphy.mtx);
1101
1102 if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) ||
1103 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR))
1104 return false;
1105
1106 /* only valid for GO and TDLS off-channel (station/p2p-CL) */
1107 if (iftype != NL80211_IFTYPE_P2P_GO &&
1108 iftype != NL80211_IFTYPE_STATION &&
1109 iftype != NL80211_IFTYPE_P2P_CLIENT)
1110 return false;
1111
1112 if (regulatory_indoor_allowed() &&
1113 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
1114 return true;
1115
1116 if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT))
1117 return false;
1118
1119 /*
1120 * Generally, it is possible to rely on another device/driver to allow
1121 * the IR concurrent relaxation, however, since the device can further
1122 * enforce the relaxation (by doing a similar verifications as this),
1123 * and thus fail the GO instantiation, consider only the interfaces of
1124 * the current registered device.
1125 */
1126 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
1127 struct ieee80211_channel *other_chan = NULL;
1128 int r1, r2;
1129
1130 wdev_lock(wdev);
1131 if (wdev->iftype == NL80211_IFTYPE_STATION &&
1132 wdev->current_bss)
1133 other_chan = wdev->current_bss->pub.channel;
1134
1135 /*
1136 * If a GO already operates on the same GO_CONCURRENT channel,
1137 * this one (maybe the same one) can beacon as well. We allow
1138 * the operation even if the station we relied on with
1139 * GO_CONCURRENT is disconnected now. But then we must make sure
1140 * we're not outdoor on an indoor-only channel.
1141 */
1142 if (iftype == NL80211_IFTYPE_P2P_GO &&
1143 wdev->iftype == NL80211_IFTYPE_P2P_GO &&
1144 wdev->beacon_interval &&
1145 !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
1146 other_chan = wdev->chandef.chan;
1147 wdev_unlock(wdev);
1148
1149 if (!other_chan)
1150 continue;
1151
1152 if (chan == other_chan)
1153 return true;
1154
1155 if (chan->band != NL80211_BAND_5GHZ &&
1156 chan->band != NL80211_BAND_6GHZ)
1157 continue;
1158
1159 r1 = cfg80211_get_unii(chan->center_freq);
1160 r2 = cfg80211_get_unii(other_chan->center_freq);
1161
1162 if (r1 != -EINVAL && r1 == r2) {
1163 /*
1164 * At some locations channels 149-165 are considered a
1165 * bundle, but at other locations, e.g., Indonesia,
1166 * channels 149-161 are considered a bundle while
1167 * channel 165 is left out and considered to be in a
1168 * different bundle. Thus, in case that there is a
1169 * station interface connected to an AP on channel 165,
1170 * it is assumed that channels 149-161 are allowed for
1171 * GO operations. However, having a station interface
1172 * connected to an AP on channels 149-161, does not
1173 * allow GO operation on channel 165.
1174 */
1175 if (chan->center_freq == 5825 &&
1176 other_chan->center_freq != 5825)
1177 continue;
1178 return true;
1179 }
1180 }
1181
1182 return false;
1183 }
1184
1185 static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy,
1186 struct cfg80211_chan_def *chandef,
1187 enum nl80211_iftype iftype,
1188 bool check_no_ir)
1189 {
1190 bool res;
1191 u32 prohibited_flags = IEEE80211_CHAN_DISABLED |
1192 IEEE80211_CHAN_RADAR;
1193
1194 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
1195
1196 if (check_no_ir)
1197 prohibited_flags |= IEEE80211_CHAN_NO_IR;
1198
1199 if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 &&
1200 cfg80211_chandef_dfs_available(wiphy, chandef)) {
1201 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */
1202 prohibited_flags = IEEE80211_CHAN_DISABLED;
1203 }
1204
1205 res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags);
1206
1207 trace_cfg80211_return_bool(res);
1208 return res;
1209 }
1210
1211 bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
1212 struct cfg80211_chan_def *chandef,
1213 enum nl80211_iftype iftype)
1214 {
1215 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true);
1216 }
1217 EXPORT_SYMBOL(cfg80211_reg_can_beacon);
1218
1219 bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy,
1220 struct cfg80211_chan_def *chandef,
1221 enum nl80211_iftype iftype)
1222 {
1223 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1224 bool check_no_ir;
1225
1226 lockdep_assert_held(&rdev->wiphy.mtx);
1227
1228 /*
1229 * Under certain conditions suggested by some regulatory bodies a
1230 * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag
1231 * only if such relaxations are not enabled and the conditions are not
1232 * met.
1233 */
1234 check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype,
1235 chandef->chan);
1236
1237 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
1238 }
1239 EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax);
1240
1241 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
1242 struct cfg80211_chan_def *chandef)
1243 {
1244 if (!rdev->ops->set_monitor_channel)
1245 return -EOPNOTSUPP;
1246 if (!cfg80211_has_monitors_only(rdev))
1247 return -EBUSY;
1248
1249 return rdev_set_monitor_channel(rdev, chandef);
1250 }
1251
1252 void
1253 cfg80211_get_chan_state(struct wireless_dev *wdev,
1254 struct ieee80211_channel **chan,
1255 enum cfg80211_chan_mode *chanmode,
1256 u8 *radar_detect)
1257 {
1258 int ret;
1259
1260 *chan = NULL;
1261 *chanmode = CHAN_MODE_UNDEFINED;
1262
1263 ASSERT_WDEV_LOCK(wdev);
1264
1265 if (wdev->netdev && !netif_running(wdev->netdev))
1266 return;
1267
1268 switch (wdev->iftype) {
1269 case NL80211_IFTYPE_ADHOC:
1270 if (wdev->current_bss) {
1271 *chan = wdev->current_bss->pub.channel;
1272 *chanmode = (wdev->ibss_fixed &&
1273 !wdev->ibss_dfs_possible)
1274 ? CHAN_MODE_SHARED
1275 : CHAN_MODE_EXCLUSIVE;
1276
1277 /* consider worst-case - IBSS can try to return to the
1278 * original user-specified channel as creator */
1279 if (wdev->ibss_dfs_possible)
1280 *radar_detect |= BIT(wdev->chandef.width);
1281 return;
1282 }
1283 break;
1284 case NL80211_IFTYPE_STATION:
1285 case NL80211_IFTYPE_P2P_CLIENT:
1286 if (wdev->current_bss) {
1287 *chan = wdev->current_bss->pub.channel;
1288 *chanmode = CHAN_MODE_SHARED;
1289 return;
1290 }
1291 break;
1292 case NL80211_IFTYPE_AP:
1293 case NL80211_IFTYPE_P2P_GO:
1294 if (wdev->cac_started) {
1295 *chan = wdev->chandef.chan;
1296 *chanmode = CHAN_MODE_SHARED;
1297 *radar_detect |= BIT(wdev->chandef.width);
1298 } else if (wdev->beacon_interval) {
1299 *chan = wdev->chandef.chan;
1300 *chanmode = CHAN_MODE_SHARED;
1301
1302 ret = cfg80211_chandef_dfs_required(wdev->wiphy,
1303 &wdev->chandef,
1304 wdev->iftype);
1305 WARN_ON(ret < 0);
1306 if (ret > 0)
1307 *radar_detect |= BIT(wdev->chandef.width);
1308 }
1309 return;
1310 case NL80211_IFTYPE_MESH_POINT:
1311 if (wdev->mesh_id_len) {
1312 *chan = wdev->chandef.chan;
1313 *chanmode = CHAN_MODE_SHARED;
1314
1315 ret = cfg80211_chandef_dfs_required(wdev->wiphy,
1316 &wdev->chandef,
1317 wdev->iftype);
1318 WARN_ON(ret < 0);
1319 if (ret > 0)
1320 *radar_detect |= BIT(wdev->chandef.width);
1321 }
1322 return;
1323 case NL80211_IFTYPE_OCB:
1324 if (wdev->chandef.chan) {
1325 *chan = wdev->chandef.chan;
1326 *chanmode = CHAN_MODE_SHARED;
1327 return;
1328 }
1329 break;
1330 case NL80211_IFTYPE_MONITOR:
1331 case NL80211_IFTYPE_AP_VLAN:
1332 case NL80211_IFTYPE_P2P_DEVICE:
1333 case NL80211_IFTYPE_NAN:
1334 /* these interface types don't really have a channel */
1335 return;
1336 case NL80211_IFTYPE_UNSPECIFIED:
1337 case NL80211_IFTYPE_WDS:
1338 case NUM_NL80211_IFTYPES:
1339 WARN_ON(1);
1340 }
1341 }
1342
1343 bool cfg80211_any_usable_channels(struct wiphy *wiphy,
1344 unsigned long sband_mask,
1345 u32 prohibited_flags)
1346 {
1347 int idx;
1348
1349 prohibited_flags |= IEEE80211_CHAN_DISABLED;
1350
1351 for_each_set_bit(idx, &sband_mask, NUM_NL80211_BANDS) {
1352 struct ieee80211_supported_band *sband = wiphy->bands[idx];
1353 int chanidx;
1354
1355 if (!sband)
1356 continue;
1357
1358 for (chanidx = 0; chanidx < sband->n_channels; chanidx++) {
1359 struct ieee80211_channel *chan;
1360
1361 chan = &sband->channels[chanidx];
1362
1363 if (chan->flags & prohibited_flags)
1364 continue;
1365
1366 return true;
1367 }
1368 }
1369
1370 return false;
1371 }
1372 EXPORT_SYMBOL(cfg80211_any_usable_channels);
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