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 2018-2023 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(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
144static 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 case NL80211_CHAN_WIDTH_320:
185 mhz = 320;
186 break;
187 default:
188 WARN_ON_ONCE(1);
189 return -1;
190 }
191 return mhz;
192}
193
194static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c)
195{
196 return nl80211_chan_width_to_mhz(chan_width: c->width);
197}
198
199bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef)
200{
201 u32 control_freq, oper_freq;
202 int oper_width, control_width;
203
204 if (!chandef->chan)
205 return false;
206
207 if (chandef->freq1_offset >= 1000)
208 return false;
209
210 control_freq = chandef->chan->center_freq;
211
212 switch (chandef->width) {
213 case NL80211_CHAN_WIDTH_5:
214 case NL80211_CHAN_WIDTH_10:
215 case NL80211_CHAN_WIDTH_20:
216 case NL80211_CHAN_WIDTH_20_NOHT:
217 if (ieee80211_chandef_to_khz(chandef) !=
218 ieee80211_channel_to_khz(chan: chandef->chan))
219 return false;
220 if (chandef->center_freq2)
221 return false;
222 break;
223 case NL80211_CHAN_WIDTH_1:
224 case NL80211_CHAN_WIDTH_2:
225 case NL80211_CHAN_WIDTH_4:
226 case NL80211_CHAN_WIDTH_8:
227 case NL80211_CHAN_WIDTH_16:
228 if (chandef->chan->band != NL80211_BAND_S1GHZ)
229 return false;
230
231 control_freq = ieee80211_channel_to_khz(chan: chandef->chan);
232 oper_freq = ieee80211_chandef_to_khz(chandef);
233 control_width = nl80211_chan_width_to_mhz(
234 chan_width: ieee80211_s1g_channel_width(
235 chan: chandef->chan));
236 oper_width = cfg80211_chandef_get_width(c: chandef);
237
238 if (oper_width < 0 || control_width < 0)
239 return false;
240 if (chandef->center_freq2)
241 return false;
242
243 if (control_freq + MHZ_TO_KHZ(control_width) / 2 >
244 oper_freq + MHZ_TO_KHZ(oper_width) / 2)
245 return false;
246
247 if (control_freq - MHZ_TO_KHZ(control_width) / 2 <
248 oper_freq - MHZ_TO_KHZ(oper_width) / 2)
249 return false;
250 break;
251 case NL80211_CHAN_WIDTH_80P80:
252 if (!chandef->center_freq2)
253 return false;
254 /* adjacent is not allowed -- that's a 160 MHz channel */
255 if (chandef->center_freq1 - chandef->center_freq2 == 80 ||
256 chandef->center_freq2 - chandef->center_freq1 == 80)
257 return false;
258 break;
259 default:
260 if (chandef->center_freq2)
261 return false;
262 break;
263 }
264
265 switch (chandef->width) {
266 case NL80211_CHAN_WIDTH_5:
267 case NL80211_CHAN_WIDTH_10:
268 case NL80211_CHAN_WIDTH_20:
269 case NL80211_CHAN_WIDTH_20_NOHT:
270 case NL80211_CHAN_WIDTH_1:
271 case NL80211_CHAN_WIDTH_2:
272 case NL80211_CHAN_WIDTH_4:
273 case NL80211_CHAN_WIDTH_8:
274 case NL80211_CHAN_WIDTH_16:
275 /* all checked above */
276 break;
277 case NL80211_CHAN_WIDTH_320:
278 if (chandef->center_freq1 == control_freq + 150 ||
279 chandef->center_freq1 == control_freq + 130 ||
280 chandef->center_freq1 == control_freq + 110 ||
281 chandef->center_freq1 == control_freq + 90 ||
282 chandef->center_freq1 == control_freq - 90 ||
283 chandef->center_freq1 == control_freq - 110 ||
284 chandef->center_freq1 == control_freq - 130 ||
285 chandef->center_freq1 == control_freq - 150)
286 break;
287 fallthrough;
288 case NL80211_CHAN_WIDTH_160:
289 if (chandef->center_freq1 == control_freq + 70 ||
290 chandef->center_freq1 == control_freq + 50 ||
291 chandef->center_freq1 == control_freq - 50 ||
292 chandef->center_freq1 == control_freq - 70)
293 break;
294 fallthrough;
295 case NL80211_CHAN_WIDTH_80P80:
296 case NL80211_CHAN_WIDTH_80:
297 if (chandef->center_freq1 == control_freq + 30 ||
298 chandef->center_freq1 == control_freq - 30)
299 break;
300 fallthrough;
301 case NL80211_CHAN_WIDTH_40:
302 if (chandef->center_freq1 == control_freq + 10 ||
303 chandef->center_freq1 == control_freq - 10)
304 break;
305 fallthrough;
306 default:
307 return false;
308 }
309
310 /* channel 14 is only for IEEE 802.11b */
311 if (chandef->center_freq1 == 2484 &&
312 chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
313 return false;
314
315 if (cfg80211_chandef_is_edmg(chandef) &&
316 !cfg80211_edmg_chandef_valid(chandef))
317 return false;
318
319 return true;
320}
321EXPORT_SYMBOL(cfg80211_chandef_valid);
322
323static void chandef_primary_freqs(const struct cfg80211_chan_def *c,
324 u32 *pri40, u32 *pri80, u32 *pri160)
325{
326 int tmp;
327
328 switch (c->width) {
329 case NL80211_CHAN_WIDTH_40:
330 *pri40 = c->center_freq1;
331 *pri80 = 0;
332 *pri160 = 0;
333 break;
334 case NL80211_CHAN_WIDTH_80:
335 case NL80211_CHAN_WIDTH_80P80:
336 *pri160 = 0;
337 *pri80 = c->center_freq1;
338 /* n_P20 */
339 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
340 /* n_P40 */
341 tmp /= 2;
342 /* freq_P40 */
343 *pri40 = c->center_freq1 - 20 + 40 * tmp;
344 break;
345 case NL80211_CHAN_WIDTH_160:
346 *pri160 = c->center_freq1;
347 /* n_P20 */
348 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
349 /* n_P40 */
350 tmp /= 2;
351 /* freq_P40 */
352 *pri40 = c->center_freq1 - 60 + 40 * tmp;
353 /* n_P80 */
354 tmp /= 2;
355 *pri80 = c->center_freq1 - 40 + 80 * tmp;
356 break;
357 case NL80211_CHAN_WIDTH_320:
358 /* n_P20 */
359 tmp = (150 + c->chan->center_freq - c->center_freq1) / 20;
360 /* n_P40 */
361 tmp /= 2;
362 /* freq_P40 */
363 *pri40 = c->center_freq1 - 140 + 40 * tmp;
364 /* n_P80 */
365 tmp /= 2;
366 *pri80 = c->center_freq1 - 120 + 80 * tmp;
367 /* n_P160 */
368 tmp /= 2;
369 *pri160 = c->center_freq1 - 80 + 160 * tmp;
370 break;
371 default:
372 WARN_ON_ONCE(1);
373 }
374}
375
376const struct cfg80211_chan_def *
377cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
378 const struct cfg80211_chan_def *c2)
379{
380 u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80, c1_pri160, c2_pri160;
381
382 /* If they are identical, return */
383 if (cfg80211_chandef_identical(chandef1: c1, chandef2: c2))
384 return c1;
385
386 /* otherwise, must have same control channel */
387 if (c1->chan != c2->chan)
388 return NULL;
389
390 /*
391 * If they have the same width, but aren't identical,
392 * then they can't be compatible.
393 */
394 if (c1->width == c2->width)
395 return NULL;
396
397 /*
398 * can't be compatible if one of them is 5 or 10 MHz,
399 * but they don't have the same width.
400 */
401 if (c1->width == NL80211_CHAN_WIDTH_5 ||
402 c1->width == NL80211_CHAN_WIDTH_10 ||
403 c2->width == NL80211_CHAN_WIDTH_5 ||
404 c2->width == NL80211_CHAN_WIDTH_10)
405 return NULL;
406
407 if (c1->width == NL80211_CHAN_WIDTH_20_NOHT ||
408 c1->width == NL80211_CHAN_WIDTH_20)
409 return c2;
410
411 if (c2->width == NL80211_CHAN_WIDTH_20_NOHT ||
412 c2->width == NL80211_CHAN_WIDTH_20)
413 return c1;
414
415 chandef_primary_freqs(c: c1, pri40: &c1_pri40, pri80: &c1_pri80, pri160: &c1_pri160);
416 chandef_primary_freqs(c: c2, pri40: &c2_pri40, pri80: &c2_pri80, pri160: &c2_pri160);
417
418 if (c1_pri40 != c2_pri40)
419 return NULL;
420
421 if (c1->width == NL80211_CHAN_WIDTH_40)
422 return c2;
423
424 if (c2->width == NL80211_CHAN_WIDTH_40)
425 return c1;
426
427 if (c1_pri80 != c2_pri80)
428 return NULL;
429
430 if (c1->width == NL80211_CHAN_WIDTH_80 &&
431 c2->width > NL80211_CHAN_WIDTH_80)
432 return c2;
433
434 if (c2->width == NL80211_CHAN_WIDTH_80 &&
435 c1->width > NL80211_CHAN_WIDTH_80)
436 return c1;
437
438 WARN_ON(!c1_pri160 && !c2_pri160);
439 if (c1_pri160 && c2_pri160 && c1_pri160 != c2_pri160)
440 return NULL;
441
442 if (c1->width > c2->width)
443 return c1;
444 return c2;
445}
446EXPORT_SYMBOL(cfg80211_chandef_compatible);
447
448static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq,
449 u32 bandwidth,
450 enum nl80211_dfs_state dfs_state)
451{
452 struct ieee80211_channel *c;
453 u32 freq;
454
455 for (freq = center_freq - bandwidth/2 + 10;
456 freq <= center_freq + bandwidth/2 - 10;
457 freq += 20) {
458 c = ieee80211_get_channel(wiphy, freq);
459 if (!c || !(c->flags & IEEE80211_CHAN_RADAR))
460 continue;
461
462 c->dfs_state = dfs_state;
463 c->dfs_state_entered = jiffies;
464 }
465}
466
467void cfg80211_set_dfs_state(struct wiphy *wiphy,
468 const struct cfg80211_chan_def *chandef,
469 enum nl80211_dfs_state dfs_state)
470{
471 int width;
472
473 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
474 return;
475
476 width = cfg80211_chandef_get_width(c: chandef);
477 if (width < 0)
478 return;
479
480 cfg80211_set_chans_dfs_state(wiphy, center_freq: chandef->center_freq1,
481 bandwidth: width, dfs_state);
482
483 if (!chandef->center_freq2)
484 return;
485 cfg80211_set_chans_dfs_state(wiphy, center_freq: chandef->center_freq2,
486 bandwidth: width, dfs_state);
487}
488
489static u32 cfg80211_get_start_freq(u32 center_freq,
490 u32 bandwidth)
491{
492 u32 start_freq;
493
494 bandwidth = MHZ_TO_KHZ(bandwidth);
495 if (bandwidth <= MHZ_TO_KHZ(20))
496 start_freq = center_freq;
497 else
498 start_freq = center_freq - bandwidth / 2 + MHZ_TO_KHZ(10);
499
500 return start_freq;
501}
502
503static u32 cfg80211_get_end_freq(u32 center_freq,
504 u32 bandwidth)
505{
506 u32 end_freq;
507
508 bandwidth = MHZ_TO_KHZ(bandwidth);
509 if (bandwidth <= MHZ_TO_KHZ(20))
510 end_freq = center_freq;
511 else
512 end_freq = center_freq + bandwidth / 2 - MHZ_TO_KHZ(10);
513
514 return end_freq;
515}
516
517static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy,
518 u32 center_freq,
519 u32 bandwidth)
520{
521 struct ieee80211_channel *c;
522 u32 freq, start_freq, end_freq;
523
524 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
525 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
526
527 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
528 c = ieee80211_get_channel_khz(wiphy, freq);
529 if (!c)
530 return -EINVAL;
531
532 if (c->flags & IEEE80211_CHAN_RADAR)
533 return 1;
534 }
535 return 0;
536}
537
538
539int cfg80211_chandef_dfs_required(struct wiphy *wiphy,
540 const struct cfg80211_chan_def *chandef,
541 enum nl80211_iftype iftype)
542{
543 int width;
544 int ret;
545
546 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
547 return -EINVAL;
548
549 switch (iftype) {
550 case NL80211_IFTYPE_ADHOC:
551 case NL80211_IFTYPE_AP:
552 case NL80211_IFTYPE_P2P_GO:
553 case NL80211_IFTYPE_MESH_POINT:
554 width = cfg80211_chandef_get_width(c: chandef);
555 if (width < 0)
556 return -EINVAL;
557
558 ret = cfg80211_get_chans_dfs_required(wiphy,
559 center_freq: ieee80211_chandef_to_khz(chandef),
560 bandwidth: width);
561 if (ret < 0)
562 return ret;
563 else if (ret > 0)
564 return BIT(chandef->width);
565
566 if (!chandef->center_freq2)
567 return 0;
568
569 ret = cfg80211_get_chans_dfs_required(wiphy,
570 MHZ_TO_KHZ(chandef->center_freq2),
571 bandwidth: width);
572 if (ret < 0)
573 return ret;
574 else if (ret > 0)
575 return BIT(chandef->width);
576
577 break;
578 case NL80211_IFTYPE_STATION:
579 case NL80211_IFTYPE_OCB:
580 case NL80211_IFTYPE_P2P_CLIENT:
581 case NL80211_IFTYPE_MONITOR:
582 case NL80211_IFTYPE_AP_VLAN:
583 case NL80211_IFTYPE_P2P_DEVICE:
584 case NL80211_IFTYPE_NAN:
585 break;
586 case NL80211_IFTYPE_WDS:
587 case NL80211_IFTYPE_UNSPECIFIED:
588 case NUM_NL80211_IFTYPES:
589 WARN_ON(1);
590 }
591
592 return 0;
593}
594EXPORT_SYMBOL(cfg80211_chandef_dfs_required);
595
596static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy,
597 u32 center_freq,
598 u32 bandwidth)
599{
600 struct ieee80211_channel *c;
601 u32 freq, start_freq, end_freq;
602 int count = 0;
603
604 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
605 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
606
607 /*
608 * Check entire range of channels for the bandwidth.
609 * Check all channels are DFS channels (DFS_USABLE or
610 * DFS_AVAILABLE). Return number of usable channels
611 * (require CAC). Allow DFS and non-DFS channel mix.
612 */
613 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
614 c = ieee80211_get_channel_khz(wiphy, freq);
615 if (!c)
616 return -EINVAL;
617
618 if (c->flags & IEEE80211_CHAN_DISABLED)
619 return -EINVAL;
620
621 if (c->flags & IEEE80211_CHAN_RADAR) {
622 if (c->dfs_state == NL80211_DFS_UNAVAILABLE)
623 return -EINVAL;
624
625 if (c->dfs_state == NL80211_DFS_USABLE)
626 count++;
627 }
628 }
629
630 return count;
631}
632
633bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
634 const struct cfg80211_chan_def *chandef)
635{
636 int width;
637 int r1, r2 = 0;
638
639 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
640 return false;
641
642 width = cfg80211_chandef_get_width(c: chandef);
643 if (width < 0)
644 return false;
645
646 r1 = cfg80211_get_chans_dfs_usable(wiphy,
647 MHZ_TO_KHZ(chandef->center_freq1),
648 bandwidth: width);
649
650 if (r1 < 0)
651 return false;
652
653 switch (chandef->width) {
654 case NL80211_CHAN_WIDTH_80P80:
655 WARN_ON(!chandef->center_freq2);
656 r2 = cfg80211_get_chans_dfs_usable(wiphy,
657 MHZ_TO_KHZ(chandef->center_freq2),
658 bandwidth: width);
659 if (r2 < 0)
660 return false;
661 break;
662 default:
663 WARN_ON(chandef->center_freq2);
664 break;
665 }
666
667 return (r1 + r2 > 0);
668}
669EXPORT_SYMBOL(cfg80211_chandef_dfs_usable);
670
671/*
672 * Checks if center frequency of chan falls with in the bandwidth
673 * range of chandef.
674 */
675bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef,
676 struct ieee80211_channel *chan,
677 bool primary_only)
678{
679 int width;
680 u32 freq;
681
682 if (!chandef->chan)
683 return false;
684
685 if (chandef->chan->center_freq == chan->center_freq)
686 return true;
687
688 if (primary_only)
689 return false;
690
691 width = cfg80211_chandef_get_width(c: chandef);
692 if (width <= 20)
693 return false;
694
695 for (freq = chandef->center_freq1 - width / 2 + 10;
696 freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) {
697 if (chan->center_freq == freq)
698 return true;
699 }
700
701 if (!chandef->center_freq2)
702 return false;
703
704 for (freq = chandef->center_freq2 - width / 2 + 10;
705 freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) {
706 if (chan->center_freq == freq)
707 return true;
708 }
709
710 return false;
711}
712
713bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev)
714{
715 unsigned int link;
716
717 lockdep_assert_wiphy(wdev->wiphy);
718
719 switch (wdev->iftype) {
720 case NL80211_IFTYPE_AP:
721 case NL80211_IFTYPE_P2P_GO:
722 for_each_valid_link(wdev, link) {
723 if (wdev->links[link].ap.beacon_interval)
724 return true;
725 }
726 break;
727 case NL80211_IFTYPE_ADHOC:
728 if (wdev->u.ibss.ssid_len)
729 return true;
730 break;
731 case NL80211_IFTYPE_MESH_POINT:
732 if (wdev->u.mesh.id_len)
733 return true;
734 break;
735 case NL80211_IFTYPE_STATION:
736 case NL80211_IFTYPE_OCB:
737 case NL80211_IFTYPE_P2P_CLIENT:
738 case NL80211_IFTYPE_MONITOR:
739 case NL80211_IFTYPE_AP_VLAN:
740 case NL80211_IFTYPE_P2P_DEVICE:
741 /* Can NAN type be considered as beaconing interface? */
742 case NL80211_IFTYPE_NAN:
743 break;
744 case NL80211_IFTYPE_UNSPECIFIED:
745 case NL80211_IFTYPE_WDS:
746 case NUM_NL80211_IFTYPES:
747 WARN_ON(1);
748 }
749
750 return false;
751}
752
753bool cfg80211_wdev_on_sub_chan(struct wireless_dev *wdev,
754 struct ieee80211_channel *chan,
755 bool primary_only)
756{
757 unsigned int link;
758
759 switch (wdev->iftype) {
760 case NL80211_IFTYPE_AP:
761 case NL80211_IFTYPE_P2P_GO:
762 for_each_valid_link(wdev, link) {
763 if (cfg80211_is_sub_chan(chandef: &wdev->links[link].ap.chandef,
764 chan, primary_only))
765 return true;
766 }
767 break;
768 case NL80211_IFTYPE_ADHOC:
769 return cfg80211_is_sub_chan(chandef: &wdev->u.ibss.chandef, chan,
770 primary_only);
771 case NL80211_IFTYPE_MESH_POINT:
772 return cfg80211_is_sub_chan(chandef: &wdev->u.mesh.chandef, chan,
773 primary_only);
774 default:
775 break;
776 }
777
778 return false;
779}
780
781static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy,
782 struct ieee80211_channel *chan)
783{
784 struct wireless_dev *wdev;
785
786 lockdep_assert_wiphy(wiphy);
787
788 list_for_each_entry(wdev, &wiphy->wdev_list, list) {
789 if (!cfg80211_beaconing_iface_active(wdev))
790 continue;
791
792 if (cfg80211_wdev_on_sub_chan(wdev, chan, primary_only: false))
793 return true;
794 }
795
796 return false;
797}
798
799static bool
800cfg80211_offchan_chain_is_active(struct cfg80211_registered_device *rdev,
801 struct ieee80211_channel *channel)
802{
803 if (!rdev->background_radar_wdev)
804 return false;
805
806 if (!cfg80211_chandef_valid(&rdev->background_radar_chandef))
807 return false;
808
809 return cfg80211_is_sub_chan(chandef: &rdev->background_radar_chandef, chan: channel,
810 primary_only: false);
811}
812
813bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy,
814 struct ieee80211_channel *chan)
815{
816 struct cfg80211_registered_device *rdev;
817
818 ASSERT_RTNL();
819
820 if (!(chan->flags & IEEE80211_CHAN_RADAR))
821 return false;
822
823 for_each_rdev(rdev) {
824 bool found;
825
826 if (!reg_dfs_domain_same(wiphy1: wiphy, wiphy2: &rdev->wiphy))
827 continue;
828
829 wiphy_lock(wiphy: &rdev->wiphy);
830 found = cfg80211_is_wiphy_oper_chan(wiphy: &rdev->wiphy, chan) ||
831 cfg80211_offchan_chain_is_active(rdev, channel: chan);
832 wiphy_unlock(wiphy: &rdev->wiphy);
833
834 if (found)
835 return true;
836 }
837
838 return false;
839}
840
841static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy,
842 u32 center_freq,
843 u32 bandwidth)
844{
845 struct ieee80211_channel *c;
846 u32 freq, start_freq, end_freq;
847 bool dfs_offload;
848
849 dfs_offload = wiphy_ext_feature_isset(wiphy,
850 ftidx: NL80211_EXT_FEATURE_DFS_OFFLOAD);
851
852 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
853 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
854
855 /*
856 * Check entire range of channels for the bandwidth.
857 * If any channel in between is disabled or has not
858 * had gone through CAC return false
859 */
860 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
861 c = ieee80211_get_channel_khz(wiphy, freq);
862 if (!c)
863 return false;
864
865 if (c->flags & IEEE80211_CHAN_DISABLED)
866 return false;
867
868 if ((c->flags & IEEE80211_CHAN_RADAR) &&
869 (c->dfs_state != NL80211_DFS_AVAILABLE) &&
870 !(c->dfs_state == NL80211_DFS_USABLE && dfs_offload))
871 return false;
872 }
873
874 return true;
875}
876
877static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy,
878 const struct cfg80211_chan_def *chandef)
879{
880 int width;
881 int r;
882
883 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
884 return false;
885
886 width = cfg80211_chandef_get_width(c: chandef);
887 if (width < 0)
888 return false;
889
890 r = cfg80211_get_chans_dfs_available(wiphy,
891 MHZ_TO_KHZ(chandef->center_freq1),
892 bandwidth: width);
893
894 /* If any of channels unavailable for cf1 just return */
895 if (!r)
896 return r;
897
898 switch (chandef->width) {
899 case NL80211_CHAN_WIDTH_80P80:
900 WARN_ON(!chandef->center_freq2);
901 r = cfg80211_get_chans_dfs_available(wiphy,
902 MHZ_TO_KHZ(chandef->center_freq2),
903 bandwidth: width);
904 break;
905 default:
906 WARN_ON(chandef->center_freq2);
907 break;
908 }
909
910 return r;
911}
912
913static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy,
914 u32 center_freq,
915 u32 bandwidth)
916{
917 struct ieee80211_channel *c;
918 u32 start_freq, end_freq, freq;
919 unsigned int dfs_cac_ms = 0;
920
921 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
922 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
923
924 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
925 c = ieee80211_get_channel_khz(wiphy, freq);
926 if (!c)
927 return 0;
928
929 if (c->flags & IEEE80211_CHAN_DISABLED)
930 return 0;
931
932 if (!(c->flags & IEEE80211_CHAN_RADAR))
933 continue;
934
935 if (c->dfs_cac_ms > dfs_cac_ms)
936 dfs_cac_ms = c->dfs_cac_ms;
937 }
938
939 return dfs_cac_ms;
940}
941
942unsigned int
943cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
944 const struct cfg80211_chan_def *chandef)
945{
946 int width;
947 unsigned int t1 = 0, t2 = 0;
948
949 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
950 return 0;
951
952 width = cfg80211_chandef_get_width(c: chandef);
953 if (width < 0)
954 return 0;
955
956 t1 = cfg80211_get_chans_dfs_cac_time(wiphy,
957 MHZ_TO_KHZ(chandef->center_freq1),
958 bandwidth: width);
959
960 if (!chandef->center_freq2)
961 return t1;
962
963 t2 = cfg80211_get_chans_dfs_cac_time(wiphy,
964 MHZ_TO_KHZ(chandef->center_freq2),
965 bandwidth: width);
966
967 return max(t1, t2);
968}
969EXPORT_SYMBOL(cfg80211_chandef_dfs_cac_time);
970
971static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
972 u32 center_freq, u32 bandwidth,
973 u32 prohibited_flags)
974{
975 struct ieee80211_channel *c;
976 u32 freq, start_freq, end_freq;
977
978 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
979 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
980
981 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
982 c = ieee80211_get_channel_khz(wiphy, freq);
983 if (!c || c->flags & prohibited_flags)
984 return false;
985 }
986
987 return true;
988}
989
990/* check if the operating channels are valid and supported */
991static bool cfg80211_edmg_usable(struct wiphy *wiphy, u8 edmg_channels,
992 enum ieee80211_edmg_bw_config edmg_bw_config,
993 int primary_channel,
994 struct ieee80211_edmg *edmg_cap)
995{
996 struct ieee80211_channel *chan;
997 int i, freq;
998 int channels_counter = 0;
999
1000 if (!edmg_channels && !edmg_bw_config)
1001 return true;
1002
1003 if ((!edmg_channels && edmg_bw_config) ||
1004 (edmg_channels && !edmg_bw_config))
1005 return false;
1006
1007 if (!(edmg_channels & BIT(primary_channel - 1)))
1008 return false;
1009
1010 /* 60GHz channels 1..6 */
1011 for (i = 0; i < 6; i++) {
1012 if (!(edmg_channels & BIT(i)))
1013 continue;
1014
1015 if (!(edmg_cap->channels & BIT(i)))
1016 return false;
1017
1018 channels_counter++;
1019
1020 freq = ieee80211_channel_to_frequency(chan: i + 1,
1021 band: NL80211_BAND_60GHZ);
1022 chan = ieee80211_get_channel(wiphy, freq);
1023 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
1024 return false;
1025 }
1026
1027 /* IEEE802.11 allows max 4 channels */
1028 if (channels_counter > 4)
1029 return false;
1030
1031 /* check bw_config is a subset of what driver supports
1032 * (see IEEE P802.11ay/D4.0 section 9.4.2.251, Table 13)
1033 */
1034 if ((edmg_bw_config % 4) > (edmg_cap->bw_config % 4))
1035 return false;
1036
1037 if (edmg_bw_config > edmg_cap->bw_config)
1038 return false;
1039
1040 return true;
1041}
1042
1043bool cfg80211_chandef_usable(struct wiphy *wiphy,
1044 const struct cfg80211_chan_def *chandef,
1045 u32 prohibited_flags)
1046{
1047 struct ieee80211_sta_ht_cap *ht_cap;
1048 struct ieee80211_sta_vht_cap *vht_cap;
1049 struct ieee80211_edmg *edmg_cap;
1050 u32 width, control_freq, cap;
1051 bool ext_nss_cap, support_80_80 = false, support_320 = false;
1052 const struct ieee80211_sband_iftype_data *iftd;
1053 struct ieee80211_supported_band *sband;
1054 int i;
1055
1056 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
1057 return false;
1058
1059 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap;
1060 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap;
1061 edmg_cap = &wiphy->bands[chandef->chan->band]->edmg_cap;
1062 ext_nss_cap = __le16_to_cpu(vht_cap->vht_mcs.tx_highest) &
1063 IEEE80211_VHT_EXT_NSS_BW_CAPABLE;
1064
1065 if (edmg_cap->channels &&
1066 !cfg80211_edmg_usable(wiphy,
1067 edmg_channels: chandef->edmg.channels,
1068 edmg_bw_config: chandef->edmg.bw_config,
1069 primary_channel: chandef->chan->hw_value,
1070 edmg_cap))
1071 return false;
1072
1073 control_freq = chandef->chan->center_freq;
1074
1075 switch (chandef->width) {
1076 case NL80211_CHAN_WIDTH_1:
1077 width = 1;
1078 break;
1079 case NL80211_CHAN_WIDTH_2:
1080 width = 2;
1081 break;
1082 case NL80211_CHAN_WIDTH_4:
1083 width = 4;
1084 break;
1085 case NL80211_CHAN_WIDTH_8:
1086 width = 8;
1087 break;
1088 case NL80211_CHAN_WIDTH_16:
1089 width = 16;
1090 break;
1091 case NL80211_CHAN_WIDTH_5:
1092 width = 5;
1093 break;
1094 case NL80211_CHAN_WIDTH_10:
1095 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ;
1096 width = 10;
1097 break;
1098 case NL80211_CHAN_WIDTH_20:
1099 if (!ht_cap->ht_supported &&
1100 chandef->chan->band != NL80211_BAND_6GHZ)
1101 return false;
1102 fallthrough;
1103 case NL80211_CHAN_WIDTH_20_NOHT:
1104 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ;
1105 width = 20;
1106 break;
1107 case NL80211_CHAN_WIDTH_40:
1108 width = 40;
1109 if (chandef->chan->band == NL80211_BAND_6GHZ)
1110 break;
1111 if (!ht_cap->ht_supported)
1112 return false;
1113 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
1114 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
1115 return false;
1116 if (chandef->center_freq1 < control_freq &&
1117 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
1118 return false;
1119 if (chandef->center_freq1 > control_freq &&
1120 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
1121 return false;
1122 break;
1123 case NL80211_CHAN_WIDTH_80P80:
1124 cap = vht_cap->cap;
1125 support_80_80 =
1126 (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) ||
1127 (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
1128 cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) ||
1129 (ext_nss_cap &&
1130 u32_get_bits(v: cap, IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) > 1);
1131 if (chandef->chan->band != NL80211_BAND_6GHZ && !support_80_80)
1132 return false;
1133 fallthrough;
1134 case NL80211_CHAN_WIDTH_80:
1135 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ;
1136 width = 80;
1137 if (chandef->chan->band == NL80211_BAND_6GHZ)
1138 break;
1139 if (!vht_cap->vht_supported)
1140 return false;
1141 break;
1142 case NL80211_CHAN_WIDTH_160:
1143 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ;
1144 width = 160;
1145 if (chandef->chan->band == NL80211_BAND_6GHZ)
1146 break;
1147 if (!vht_cap->vht_supported)
1148 return false;
1149 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
1150 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
1151 cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ &&
1152 !(ext_nss_cap &&
1153 (vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK)))
1154 return false;
1155 break;
1156 case NL80211_CHAN_WIDTH_320:
1157 prohibited_flags |= IEEE80211_CHAN_NO_320MHZ;
1158 width = 320;
1159
1160 if (chandef->chan->band != NL80211_BAND_6GHZ)
1161 return false;
1162
1163 sband = wiphy->bands[NL80211_BAND_6GHZ];
1164 if (!sband)
1165 return false;
1166
1167 for_each_sband_iftype_data(sband, i, iftd) {
1168 if (!iftd->eht_cap.has_eht)
1169 continue;
1170
1171 if (iftd->eht_cap.eht_cap_elem.phy_cap_info[0] &
1172 IEEE80211_EHT_PHY_CAP0_320MHZ_IN_6GHZ) {
1173 support_320 = true;
1174 break;
1175 }
1176 }
1177
1178 if (!support_320)
1179 return false;
1180 break;
1181 default:
1182 WARN_ON_ONCE(1);
1183 return false;
1184 }
1185
1186 /*
1187 * TODO: What if there are only certain 80/160/80+80 MHz channels
1188 * allowed by the driver, or only certain combinations?
1189 * For 40 MHz the driver can set the NO_HT40 flags, but for
1190 * 80/160 MHz and in particular 80+80 MHz this isn't really
1191 * feasible and we only have NO_80MHZ/NO_160MHZ so far but
1192 * no way to cover 80+80 MHz or more complex restrictions.
1193 * Note that such restrictions also need to be advertised to
1194 * userspace, for example for P2P channel selection.
1195 */
1196
1197 if (width > 20)
1198 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
1199
1200 /* 5 and 10 MHz are only defined for the OFDM PHY */
1201 if (width < 20)
1202 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
1203
1204
1205 if (!cfg80211_secondary_chans_ok(wiphy,
1206 center_freq: ieee80211_chandef_to_khz(chandef),
1207 bandwidth: width, prohibited_flags))
1208 return false;
1209
1210 if (!chandef->center_freq2)
1211 return true;
1212 return cfg80211_secondary_chans_ok(wiphy,
1213 MHZ_TO_KHZ(chandef->center_freq2),
1214 bandwidth: width, prohibited_flags);
1215}
1216EXPORT_SYMBOL(cfg80211_chandef_usable);
1217
1218static bool cfg80211_ir_permissive_check_wdev(enum nl80211_iftype iftype,
1219 struct wireless_dev *wdev,
1220 struct ieee80211_channel *chan)
1221{
1222 struct ieee80211_channel *other_chan = NULL;
1223 unsigned int link_id;
1224 int r1, r2;
1225
1226 for_each_valid_link(wdev, link_id) {
1227 if (wdev->iftype == NL80211_IFTYPE_STATION &&
1228 wdev->links[link_id].client.current_bss)
1229 other_chan = wdev->links[link_id].client.current_bss->pub.channel;
1230
1231 /*
1232 * If a GO already operates on the same GO_CONCURRENT channel,
1233 * this one (maybe the same one) can beacon as well. We allow
1234 * the operation even if the station we relied on with
1235 * GO_CONCURRENT is disconnected now. But then we must make sure
1236 * we're not outdoor on an indoor-only channel.
1237 */
1238 if (iftype == NL80211_IFTYPE_P2P_GO &&
1239 wdev->iftype == NL80211_IFTYPE_P2P_GO &&
1240 wdev->links[link_id].ap.beacon_interval &&
1241 !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
1242 other_chan = wdev->links[link_id].ap.chandef.chan;
1243
1244 if (!other_chan)
1245 continue;
1246
1247 if (chan == other_chan)
1248 return true;
1249
1250 if (chan->band != NL80211_BAND_5GHZ &&
1251 chan->band != NL80211_BAND_6GHZ)
1252 continue;
1253
1254 r1 = cfg80211_get_unii(freq: chan->center_freq);
1255 r2 = cfg80211_get_unii(freq: other_chan->center_freq);
1256
1257 if (r1 != -EINVAL && r1 == r2) {
1258 /*
1259 * At some locations channels 149-165 are considered a
1260 * bundle, but at other locations, e.g., Indonesia,
1261 * channels 149-161 are considered a bundle while
1262 * channel 165 is left out and considered to be in a
1263 * different bundle. Thus, in case that there is a
1264 * station interface connected to an AP on channel 165,
1265 * it is assumed that channels 149-161 are allowed for
1266 * GO operations. However, having a station interface
1267 * connected to an AP on channels 149-161, does not
1268 * allow GO operation on channel 165.
1269 */
1270 if (chan->center_freq == 5825 &&
1271 other_chan->center_freq != 5825)
1272 continue;
1273 return true;
1274 }
1275 }
1276
1277 return false;
1278}
1279
1280/*
1281 * Check if the channel can be used under permissive conditions mandated by
1282 * some regulatory bodies, i.e., the channel is marked with
1283 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface
1284 * associated to an AP on the same channel or on the same UNII band
1285 * (assuming that the AP is an authorized master).
1286 * In addition allow operation on a channel on which indoor operation is
1287 * allowed, iff we are currently operating in an indoor environment.
1288 */
1289static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy,
1290 enum nl80211_iftype iftype,
1291 struct ieee80211_channel *chan)
1292{
1293 struct wireless_dev *wdev;
1294 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1295
1296 lockdep_assert_held(&rdev->wiphy.mtx);
1297
1298 if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) ||
1299 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR))
1300 return false;
1301
1302 /* only valid for GO and TDLS off-channel (station/p2p-CL) */
1303 if (iftype != NL80211_IFTYPE_P2P_GO &&
1304 iftype != NL80211_IFTYPE_STATION &&
1305 iftype != NL80211_IFTYPE_P2P_CLIENT)
1306 return false;
1307
1308 if (regulatory_indoor_allowed() &&
1309 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
1310 return true;
1311
1312 if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT))
1313 return false;
1314
1315 /*
1316 * Generally, it is possible to rely on another device/driver to allow
1317 * the IR concurrent relaxation, however, since the device can further
1318 * enforce the relaxation (by doing a similar verifications as this),
1319 * and thus fail the GO instantiation, consider only the interfaces of
1320 * the current registered device.
1321 */
1322 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
1323 bool ret;
1324
1325 ret = cfg80211_ir_permissive_check_wdev(iftype, wdev, chan);
1326 if (ret)
1327 return ret;
1328 }
1329
1330 return false;
1331}
1332
1333static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy,
1334 struct cfg80211_chan_def *chandef,
1335 enum nl80211_iftype iftype,
1336 bool check_no_ir)
1337{
1338 bool res;
1339 u32 prohibited_flags = IEEE80211_CHAN_DISABLED |
1340 IEEE80211_CHAN_RADAR;
1341
1342 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
1343
1344 if (check_no_ir)
1345 prohibited_flags |= IEEE80211_CHAN_NO_IR;
1346
1347 if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 &&
1348 cfg80211_chandef_dfs_available(wiphy, chandef)) {
1349 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */
1350 prohibited_flags = IEEE80211_CHAN_DISABLED;
1351 }
1352
1353 res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags);
1354
1355 trace_cfg80211_return_bool(ret: res);
1356 return res;
1357}
1358
1359bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
1360 struct cfg80211_chan_def *chandef,
1361 enum nl80211_iftype iftype)
1362{
1363 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir: true);
1364}
1365EXPORT_SYMBOL(cfg80211_reg_can_beacon);
1366
1367bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy,
1368 struct cfg80211_chan_def *chandef,
1369 enum nl80211_iftype iftype)
1370{
1371 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1372 bool check_no_ir;
1373
1374 lockdep_assert_held(&rdev->wiphy.mtx);
1375
1376 /*
1377 * Under certain conditions suggested by some regulatory bodies a
1378 * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag
1379 * only if such relaxations are not enabled and the conditions are not
1380 * met.
1381 */
1382 check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype,
1383 chan: chandef->chan);
1384
1385 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
1386}
1387EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax);
1388
1389int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
1390 struct cfg80211_chan_def *chandef)
1391{
1392 if (!rdev->ops->set_monitor_channel)
1393 return -EOPNOTSUPP;
1394 if (!cfg80211_has_monitors_only(rdev))
1395 return -EBUSY;
1396
1397 return rdev_set_monitor_channel(rdev, chandef);
1398}
1399
1400bool cfg80211_any_usable_channels(struct wiphy *wiphy,
1401 unsigned long sband_mask,
1402 u32 prohibited_flags)
1403{
1404 int idx;
1405
1406 prohibited_flags |= IEEE80211_CHAN_DISABLED;
1407
1408 for_each_set_bit(idx, &sband_mask, NUM_NL80211_BANDS) {
1409 struct ieee80211_supported_band *sband = wiphy->bands[idx];
1410 int chanidx;
1411
1412 if (!sband)
1413 continue;
1414
1415 for (chanidx = 0; chanidx < sband->n_channels; chanidx++) {
1416 struct ieee80211_channel *chan;
1417
1418 chan = &sband->channels[chanidx];
1419
1420 if (chan->flags & prohibited_flags)
1421 continue;
1422
1423 return true;
1424 }
1425 }
1426
1427 return false;
1428}
1429EXPORT_SYMBOL(cfg80211_any_usable_channels);
1430
1431struct cfg80211_chan_def *wdev_chandef(struct wireless_dev *wdev,
1432 unsigned int link_id)
1433{
1434 lockdep_assert_wiphy(wdev->wiphy);
1435
1436 WARN_ON(wdev->valid_links && !(wdev->valid_links & BIT(link_id)));
1437 WARN_ON(!wdev->valid_links && link_id > 0);
1438
1439 switch (wdev->iftype) {
1440 case NL80211_IFTYPE_MESH_POINT:
1441 return &wdev->u.mesh.chandef;
1442 case NL80211_IFTYPE_ADHOC:
1443 return &wdev->u.ibss.chandef;
1444 case NL80211_IFTYPE_OCB:
1445 return &wdev->u.ocb.chandef;
1446 case NL80211_IFTYPE_AP:
1447 case NL80211_IFTYPE_P2P_GO:
1448 return &wdev->links[link_id].ap.chandef;
1449 default:
1450 return NULL;
1451 }
1452}
1453EXPORT_SYMBOL(wdev_chandef);
1454
1455struct cfg80211_per_bw_puncturing_values {
1456 u8 len;
1457 const u16 *valid_values;
1458};
1459
1460static const u16 puncturing_values_80mhz[] = {
1461 0x8, 0x4, 0x2, 0x1
1462};
1463
1464static const u16 puncturing_values_160mhz[] = {
1465 0x80, 0x40, 0x20, 0x10, 0x8, 0x4, 0x2, 0x1, 0xc0, 0x30, 0xc, 0x3
1466};
1467
1468static const u16 puncturing_values_320mhz[] = {
1469 0xc000, 0x3000, 0xc00, 0x300, 0xc0, 0x30, 0xc, 0x3, 0xf000, 0xf00,
1470 0xf0, 0xf, 0xfc00, 0xf300, 0xf0c0, 0xf030, 0xf00c, 0xf003, 0xc00f,
1471 0x300f, 0xc0f, 0x30f, 0xcf, 0x3f
1472};
1473
1474#define CFG80211_PER_BW_VALID_PUNCTURING_VALUES(_bw) \
1475 { \
1476 .len = ARRAY_SIZE(puncturing_values_ ## _bw ## mhz), \
1477 .valid_values = puncturing_values_ ## _bw ## mhz \
1478 }
1479
1480static const struct cfg80211_per_bw_puncturing_values per_bw_puncturing[] = {
1481 CFG80211_PER_BW_VALID_PUNCTURING_VALUES(80),
1482 CFG80211_PER_BW_VALID_PUNCTURING_VALUES(160),
1483 CFG80211_PER_BW_VALID_PUNCTURING_VALUES(320)
1484};
1485
1486bool cfg80211_valid_disable_subchannel_bitmap(u16 *bitmap,
1487 const struct cfg80211_chan_def *chandef)
1488{
1489 u32 idx, i, start_freq;
1490
1491 switch (chandef->width) {
1492 case NL80211_CHAN_WIDTH_80:
1493 idx = 0;
1494 start_freq = chandef->center_freq1 - 40;
1495 break;
1496 case NL80211_CHAN_WIDTH_160:
1497 idx = 1;
1498 start_freq = chandef->center_freq1 - 80;
1499 break;
1500 case NL80211_CHAN_WIDTH_320:
1501 idx = 2;
1502 start_freq = chandef->center_freq1 - 160;
1503 break;
1504 default:
1505 *bitmap = 0;
1506 break;
1507 }
1508
1509 if (!*bitmap)
1510 return true;
1511
1512 /* check if primary channel is punctured */
1513 if (*bitmap & (u16)BIT((chandef->chan->center_freq - start_freq) / 20))
1514 return false;
1515
1516 for (i = 0; i < per_bw_puncturing[idx].len; i++)
1517 if (per_bw_puncturing[idx].valid_values[i] == *bitmap)
1518 return true;
1519
1520 return false;
1521}
1522EXPORT_SYMBOL(cfg80211_valid_disable_subchannel_bitmap);
1523

source code of linux/net/wireless/chan.c