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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 */
8
9#include <net/cfg80211.h>
10#include "core.h"
11
12struct ieee80211_channel *
13rdev_freq_to_chan(struct cfg80211_registered_device *rdev,
14 int freq, enum nl80211_channel_type channel_type)
15{
16 struct ieee80211_channel *chan;
17 struct ieee80211_sta_ht_cap *ht_cap;
18
19 chan = ieee80211_get_channel(&rdev->wiphy, freq);
20
21 /* Primary channel not allowed */
22 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
23 return NULL;
24
25 if (channel_type == NL80211_CHAN_HT40MINUS &&
26 chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
27 return NULL;
28 else if (channel_type == NL80211_CHAN_HT40PLUS &&
29 chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
30 return NULL;
31
32 ht_cap = &rdev->wiphy.bands[chan->band]->ht_cap;
33
34 if (channel_type != NL80211_CHAN_NO_HT) {
35 if (!ht_cap->ht_supported)
36 return NULL;
37
38 if (channel_type != NL80211_CHAN_HT20 &&
39 (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
40 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT))
41 return NULL;
42 }
43
44 return chan;
45}
46
47static bool can_beacon_sec_chan(struct wiphy *wiphy,
48 struct ieee80211_channel *chan,
49 enum nl80211_channel_type channel_type)
50{
51 struct ieee80211_channel *sec_chan;
52 int diff;
53
54 switch (channel_type) {
55 case NL80211_CHAN_HT40PLUS:
56 diff = 20;
57 break;
58 case NL80211_CHAN_HT40MINUS:
59 diff = -20;
60 break;
61 default:
62 return false;
63 }
64
65 sec_chan = ieee80211_get_channel(wiphy, chan->center_freq + diff);
66 if (!sec_chan)
67 return false;
68
69 /* we'll need a DFS capability later */
70 if (sec_chan->flags & (IEEE80211_CHAN_DISABLED |
71 IEEE80211_CHAN_PASSIVE_SCAN |
72 IEEE80211_CHAN_NO_IBSS |
73 IEEE80211_CHAN_RADAR))
74 return false;
75
76 return true;
77}
78
79int cfg80211_set_freq(struct cfg80211_registered_device *rdev,
80 struct wireless_dev *wdev, int freq,
81 enum nl80211_channel_type channel_type)
82{
83 struct ieee80211_channel *chan;
84 int result;
85
86 if (wdev && wdev->iftype == NL80211_IFTYPE_MONITOR)
87 wdev = NULL;
88
89 if (wdev) {
90 ASSERT_WDEV_LOCK(wdev);
91
92 if (!netif_running(wdev->netdev))
93 return -ENETDOWN;
94 }
95
96 if (!rdev->ops->set_channel)
97 return -EOPNOTSUPP;
98
99 chan = rdev_freq_to_chan(rdev, freq, channel_type);
100 if (!chan)
101 return -EINVAL;
102
103 /* Both channels should be able to initiate communication */
104 if (wdev && (wdev->iftype == NL80211_IFTYPE_ADHOC ||
105 wdev->iftype == NL80211_IFTYPE_AP ||
106 wdev->iftype == NL80211_IFTYPE_AP_VLAN ||
107 wdev->iftype == NL80211_IFTYPE_MESH_POINT ||
108 wdev->iftype == NL80211_IFTYPE_P2P_GO)) {
109 switch (channel_type) {
110 case NL80211_CHAN_HT40PLUS:
111 case NL80211_CHAN_HT40MINUS:
112 if (!can_beacon_sec_chan(&rdev->wiphy, chan,
113 channel_type)) {
114 printk(KERN_DEBUG
115 "cfg80211: Secondary channel not "
116 "allowed to initiate communication\n");
117 return -EINVAL;
118 }
119 break;
120 default:
121 break;
122 }
123 }
124
125 result = rdev->ops->set_channel(&rdev->wiphy,
126 wdev ? wdev->netdev : NULL,
127 chan, channel_type);
128 if (result)
129 return result;
130
131 if (wdev)
132 wdev->channel = chan;
133
134 return 0;
135}
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 2018-2022 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
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(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(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(chandef->chan);
232 oper_freq = ieee80211_chandef_to_khz(chandef);
233 control_width = nl80211_chan_width_to_mhz(
234 ieee80211_s1g_channel_width(
235 chandef->chan));
236 oper_width = cfg80211_chandef_get_width(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(c1, 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(c1, &c1_pri40, &c1_pri80, &c1_pri160);
416 chandef_primary_freqs(c2, &c2_pri40, &c2_pri80, &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(chandef);
477 if (width < 0)
478 return;
479
480 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1,
481 width, dfs_state);
482
483 if (!chandef->center_freq2)
484 return;
485 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2,
486 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(chandef);
555 if (width < 0)
556 return -EINVAL;
557
558 ret = cfg80211_get_chans_dfs_required(wiphy,
559 ieee80211_chandef_to_khz(chandef),
560 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 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(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 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 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}
669
670/*
671 * Checks if center frequency of chan falls with in the bandwidth
672 * range of chandef.
673 */
674bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef,
675 struct ieee80211_channel *chan,
676 bool primary_only)
677{
678 int width;
679 u32 freq;
680
681 if (!chandef->chan)
682 return false;
683
684 if (chandef->chan->center_freq == chan->center_freq)
685 return true;
686
687 if (primary_only)
688 return false;
689
690 width = cfg80211_chandef_get_width(chandef);
691 if (width <= 20)
692 return false;
693
694 for (freq = chandef->center_freq1 - width / 2 + 10;
695 freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) {
696 if (chan->center_freq == freq)
697 return true;
698 }
699
700 if (!chandef->center_freq2)
701 return false;
702
703 for (freq = chandef->center_freq2 - width / 2 + 10;
704 freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) {
705 if (chan->center_freq == freq)
706 return true;
707 }
708
709 return false;
710}
711
712bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev)
713{
714 unsigned int link;
715
716 ASSERT_WDEV_LOCK(wdev);
717
718 switch (wdev->iftype) {
719 case NL80211_IFTYPE_AP:
720 case NL80211_IFTYPE_P2P_GO:
721 for_each_valid_link(wdev, link) {
722 if (wdev->links[link].ap.beacon_interval)
723 return true;
724 }
725 break;
726 case NL80211_IFTYPE_ADHOC:
727 if (wdev->u.ibss.ssid_len)
728 return true;
729 break;
730 case NL80211_IFTYPE_MESH_POINT:
731 if (wdev->u.mesh.id_len)
732 return true;
733 break;
734 case NL80211_IFTYPE_STATION:
735 case NL80211_IFTYPE_OCB:
736 case NL80211_IFTYPE_P2P_CLIENT:
737 case NL80211_IFTYPE_MONITOR:
738 case NL80211_IFTYPE_AP_VLAN:
739 case NL80211_IFTYPE_P2P_DEVICE:
740 /* Can NAN type be considered as beaconing interface? */
741 case NL80211_IFTYPE_NAN:
742 break;
743 case NL80211_IFTYPE_UNSPECIFIED:
744 case NL80211_IFTYPE_WDS:
745 case NUM_NL80211_IFTYPES:
746 WARN_ON(1);
747 }
748
749 return false;
750}
751
752bool cfg80211_wdev_on_sub_chan(struct wireless_dev *wdev,
753 struct ieee80211_channel *chan,
754 bool primary_only)
755{
756 unsigned int link;
757
758 switch (wdev->iftype) {
759 case NL80211_IFTYPE_AP:
760 case NL80211_IFTYPE_P2P_GO:
761 for_each_valid_link(wdev, link) {
762 if (cfg80211_is_sub_chan(&wdev->links[link].ap.chandef,
763 chan, primary_only))
764 return true;
765 }
766 break;
767 case NL80211_IFTYPE_ADHOC:
768 return cfg80211_is_sub_chan(&wdev->u.ibss.chandef, chan,
769 primary_only);
770 case NL80211_IFTYPE_MESH_POINT:
771 return cfg80211_is_sub_chan(&wdev->u.mesh.chandef, chan,
772 primary_only);
773 default:
774 break;
775 }
776
777 return false;
778}
779
780static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy,
781 struct ieee80211_channel *chan)
782{
783 struct wireless_dev *wdev;
784
785 list_for_each_entry(wdev, &wiphy->wdev_list, list) {
786 wdev_lock(wdev);
787 if (!cfg80211_beaconing_iface_active(wdev)) {
788 wdev_unlock(wdev);
789 continue;
790 }
791
792 if (cfg80211_wdev_on_sub_chan(wdev, chan, false)) {
793 wdev_unlock(wdev);
794 return true;
795 }
796 wdev_unlock(wdev);
797 }
798
799 return false;
800}
801
802static bool
803cfg80211_offchan_chain_is_active(struct cfg80211_registered_device *rdev,
804 struct ieee80211_channel *channel)
805{
806 if (!rdev->background_radar_wdev)
807 return false;
808
809 if (!cfg80211_chandef_valid(&rdev->background_radar_chandef))
810 return false;
811
812 return cfg80211_is_sub_chan(&rdev->background_radar_chandef, channel,
813 false);
814}
815
816bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy,
817 struct ieee80211_channel *chan)
818{
819 struct cfg80211_registered_device *rdev;
820
821 ASSERT_RTNL();
822
823 if (!(chan->flags & IEEE80211_CHAN_RADAR))
824 return false;
825
826 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
827 if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))
828 continue;
829
830 if (cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan))
831 return true;
832
833 if (cfg80211_offchan_chain_is_active(rdev, chan))
834 return true;
835 }
836
837 return false;
838}
839
840static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy,
841 u32 center_freq,
842 u32 bandwidth)
843{
844 struct ieee80211_channel *c;
845 u32 freq, start_freq, end_freq;
846 bool dfs_offload;
847
848 dfs_offload = wiphy_ext_feature_isset(wiphy,
849 NL80211_EXT_FEATURE_DFS_OFFLOAD);
850
851 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
852 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
853
854 /*
855 * Check entire range of channels for the bandwidth.
856 * If any channel in between is disabled or has not
857 * had gone through CAC return false
858 */
859 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
860 c = ieee80211_get_channel_khz(wiphy, freq);
861 if (!c)
862 return false;
863
864 if (c->flags & IEEE80211_CHAN_DISABLED)
865 return false;
866
867 if ((c->flags & IEEE80211_CHAN_RADAR) &&
868 (c->dfs_state != NL80211_DFS_AVAILABLE) &&
869 !(c->dfs_state == NL80211_DFS_USABLE && dfs_offload))
870 return false;
871 }
872
873 return true;
874}
875
876static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy,
877 const struct cfg80211_chan_def *chandef)
878{
879 int width;
880 int r;
881
882 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
883 return false;
884
885 width = cfg80211_chandef_get_width(chandef);
886 if (width < 0)
887 return false;
888
889 r = cfg80211_get_chans_dfs_available(wiphy,
890 MHZ_TO_KHZ(chandef->center_freq1),
891 width);
892
893 /* If any of channels unavailable for cf1 just return */
894 if (!r)
895 return r;
896
897 switch (chandef->width) {
898 case NL80211_CHAN_WIDTH_80P80:
899 WARN_ON(!chandef->center_freq2);
900 r = cfg80211_get_chans_dfs_available(wiphy,
901 MHZ_TO_KHZ(chandef->center_freq2),
902 width);
903 break;
904 default:
905 WARN_ON(chandef->center_freq2);
906 break;
907 }
908
909 return r;
910}
911
912static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy,
913 u32 center_freq,
914 u32 bandwidth)
915{
916 struct ieee80211_channel *c;
917 u32 start_freq, end_freq, freq;
918 unsigned int dfs_cac_ms = 0;
919
920 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
921 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
922
923 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
924 c = ieee80211_get_channel_khz(wiphy, freq);
925 if (!c)
926 return 0;
927
928 if (c->flags & IEEE80211_CHAN_DISABLED)
929 return 0;
930
931 if (!(c->flags & IEEE80211_CHAN_RADAR))
932 continue;
933
934 if (c->dfs_cac_ms > dfs_cac_ms)
935 dfs_cac_ms = c->dfs_cac_ms;
936 }
937
938 return dfs_cac_ms;
939}
940
941unsigned int
942cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
943 const struct cfg80211_chan_def *chandef)
944{
945 int width;
946 unsigned int t1 = 0, t2 = 0;
947
948 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
949 return 0;
950
951 width = cfg80211_chandef_get_width(chandef);
952 if (width < 0)
953 return 0;
954
955 t1 = cfg80211_get_chans_dfs_cac_time(wiphy,
956 MHZ_TO_KHZ(chandef->center_freq1),
957 width);
958
959 if (!chandef->center_freq2)
960 return t1;
961
962 t2 = cfg80211_get_chans_dfs_cac_time(wiphy,
963 MHZ_TO_KHZ(chandef->center_freq2),
964 width);
965
966 return max(t1, t2);
967}
968
969static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
970 u32 center_freq, u32 bandwidth,
971 u32 prohibited_flags)
972{
973 struct ieee80211_channel *c;
974 u32 freq, start_freq, end_freq;
975
976 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
977 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
978
979 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
980 c = ieee80211_get_channel_khz(wiphy, freq);
981 if (!c || c->flags & prohibited_flags)
982 return false;
983 }
984
985 return true;
986}
987
988/* check if the operating channels are valid and supported */
989static bool cfg80211_edmg_usable(struct wiphy *wiphy, u8 edmg_channels,
990 enum ieee80211_edmg_bw_config edmg_bw_config,
991 int primary_channel,
992 struct ieee80211_edmg *edmg_cap)
993{
994 struct ieee80211_channel *chan;
995 int i, freq;
996 int channels_counter = 0;
997
998 if (!edmg_channels && !edmg_bw_config)
999 return true;
1000
1001 if ((!edmg_channels && edmg_bw_config) ||
1002 (edmg_channels && !edmg_bw_config))
1003 return false;
1004
1005 if (!(edmg_channels & BIT(primary_channel - 1)))
1006 return false;
1007
1008 /* 60GHz channels 1..6 */
1009 for (i = 0; i < 6; i++) {
1010 if (!(edmg_channels & BIT(i)))
1011 continue;
1012
1013 if (!(edmg_cap->channels & BIT(i)))
1014 return false;
1015
1016 channels_counter++;
1017
1018 freq = ieee80211_channel_to_frequency(i + 1,
1019 NL80211_BAND_60GHZ);
1020 chan = ieee80211_get_channel(wiphy, freq);
1021 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
1022 return false;
1023 }
1024
1025 /* IEEE802.11 allows max 4 channels */
1026 if (channels_counter > 4)
1027 return false;
1028
1029 /* check bw_config is a subset of what driver supports
1030 * (see IEEE P802.11ay/D4.0 section 9.4.2.251, Table 13)
1031 */
1032 if ((edmg_bw_config % 4) > (edmg_cap->bw_config % 4))
1033 return false;
1034
1035 if (edmg_bw_config > edmg_cap->bw_config)
1036 return false;
1037
1038 return true;
1039}
1040
1041bool cfg80211_chandef_usable(struct wiphy *wiphy,
1042 const struct cfg80211_chan_def *chandef,
1043 u32 prohibited_flags)
1044{
1045 struct ieee80211_sta_ht_cap *ht_cap;
1046 struct ieee80211_sta_vht_cap *vht_cap;
1047 struct ieee80211_edmg *edmg_cap;
1048 u32 width, control_freq, cap;
1049 bool ext_nss_cap, support_80_80 = false, support_320 = false;
1050 const struct ieee80211_sband_iftype_data *iftd;
1051 struct ieee80211_supported_band *sband;
1052 int i;
1053
1054 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
1055 return false;
1056
1057 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap;
1058 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap;
1059 edmg_cap = &wiphy->bands[chandef->chan->band]->edmg_cap;
1060 ext_nss_cap = __le16_to_cpu(vht_cap->vht_mcs.tx_highest) &
1061 IEEE80211_VHT_EXT_NSS_BW_CAPABLE;
1062
1063 if (edmg_cap->channels &&
1064 !cfg80211_edmg_usable(wiphy,
1065 chandef->edmg.channels,
1066 chandef->edmg.bw_config,
1067 chandef->chan->hw_value,
1068 edmg_cap))
1069 return false;
1070
1071 control_freq = chandef->chan->center_freq;
1072
1073 switch (chandef->width) {
1074 case NL80211_CHAN_WIDTH_1:
1075 width = 1;
1076 break;
1077 case NL80211_CHAN_WIDTH_2:
1078 width = 2;
1079 break;
1080 case NL80211_CHAN_WIDTH_4:
1081 width = 4;
1082 break;
1083 case NL80211_CHAN_WIDTH_8:
1084 width = 8;
1085 break;
1086 case NL80211_CHAN_WIDTH_16:
1087 width = 16;
1088 break;
1089 case NL80211_CHAN_WIDTH_5:
1090 width = 5;
1091 break;
1092 case NL80211_CHAN_WIDTH_10:
1093 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ;
1094 width = 10;
1095 break;
1096 case NL80211_CHAN_WIDTH_20:
1097 if (!ht_cap->ht_supported &&
1098 chandef->chan->band != NL80211_BAND_6GHZ)
1099 return false;
1100 fallthrough;
1101 case NL80211_CHAN_WIDTH_20_NOHT:
1102 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ;
1103 width = 20;
1104 break;
1105 case NL80211_CHAN_WIDTH_40:
1106 width = 40;
1107 if (chandef->chan->band == NL80211_BAND_6GHZ)
1108 break;
1109 if (!ht_cap->ht_supported)
1110 return false;
1111 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
1112 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
1113 return false;
1114 if (chandef->center_freq1 < control_freq &&
1115 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
1116 return false;
1117 if (chandef->center_freq1 > control_freq &&
1118 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
1119 return false;
1120 break;
1121 case NL80211_CHAN_WIDTH_80P80:
1122 cap = vht_cap->cap;
1123 support_80_80 =
1124 (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) ||
1125 (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
1126 cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) ||
1127 (ext_nss_cap &&
1128 u32_get_bits(cap, IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) > 1);
1129 if (chandef->chan->band != NL80211_BAND_6GHZ && !support_80_80)
1130 return false;
1131 fallthrough;
1132 case NL80211_CHAN_WIDTH_80:
1133 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ;
1134 width = 80;
1135 if (chandef->chan->band == NL80211_BAND_6GHZ)
1136 break;
1137 if (!vht_cap->vht_supported)
1138 return false;
1139 break;
1140 case NL80211_CHAN_WIDTH_160:
1141 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ;
1142 width = 160;
1143 if (chandef->chan->band == NL80211_BAND_6GHZ)
1144 break;
1145 if (!vht_cap->vht_supported)
1146 return false;
1147 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
1148 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
1149 cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ &&
1150 !(ext_nss_cap &&
1151 (vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK)))
1152 return false;
1153 break;
1154 case NL80211_CHAN_WIDTH_320:
1155 prohibited_flags |= IEEE80211_CHAN_NO_320MHZ;
1156 width = 320;
1157
1158 if (chandef->chan->band != NL80211_BAND_6GHZ)
1159 return false;
1160
1161 sband = wiphy->bands[NL80211_BAND_6GHZ];
1162 if (!sband)
1163 return false;
1164
1165 for (i = 0; i < sband->n_iftype_data; i++) {
1166 iftd = &sband->iftype_data[i];
1167 if (!iftd->eht_cap.has_eht)
1168 continue;
1169
1170 if (iftd->eht_cap.eht_cap_elem.phy_cap_info[0] &
1171 IEEE80211_EHT_PHY_CAP0_320MHZ_IN_6GHZ) {
1172 support_320 = true;
1173 break;
1174 }
1175 }
1176
1177 if (!support_320)
1178 return false;
1179 break;
1180 default:
1181 WARN_ON_ONCE(1);
1182 return false;
1183 }
1184
1185 /*
1186 * TODO: What if there are only certain 80/160/80+80 MHz channels
1187 * allowed by the driver, or only certain combinations?
1188 * For 40 MHz the driver can set the NO_HT40 flags, but for
1189 * 80/160 MHz and in particular 80+80 MHz this isn't really
1190 * feasible and we only have NO_80MHZ/NO_160MHZ so far but
1191 * no way to cover 80+80 MHz or more complex restrictions.
1192 * Note that such restrictions also need to be advertised to
1193 * userspace, for example for P2P channel selection.
1194 */
1195
1196 if (width > 20)
1197 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
1198
1199 /* 5 and 10 MHz are only defined for the OFDM PHY */
1200 if (width < 20)
1201 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
1202
1203
1204 if (!cfg80211_secondary_chans_ok(wiphy,
1205 ieee80211_chandef_to_khz(chandef),
1206 width, prohibited_flags))
1207 return false;
1208
1209 if (!chandef->center_freq2)
1210 return true;
1211 return cfg80211_secondary_chans_ok(wiphy,
1212 MHZ_TO_KHZ(chandef->center_freq2),
1213 width, prohibited_flags);
1214}
1215EXPORT_SYMBOL(cfg80211_chandef_usable);
1216
1217static bool cfg80211_ir_permissive_check_wdev(enum nl80211_iftype iftype,
1218 struct wireless_dev *wdev,
1219 struct ieee80211_channel *chan)
1220{
1221 struct ieee80211_channel *other_chan = NULL;
1222 unsigned int link_id;
1223 int r1, r2;
1224
1225 for_each_valid_link(wdev, link_id) {
1226 if (wdev->iftype == NL80211_IFTYPE_STATION &&
1227 wdev->links[link_id].client.current_bss)
1228 other_chan = wdev->links[link_id].client.current_bss->pub.channel;
1229
1230 /*
1231 * If a GO already operates on the same GO_CONCURRENT channel,
1232 * this one (maybe the same one) can beacon as well. We allow
1233 * the operation even if the station we relied on with
1234 * GO_CONCURRENT is disconnected now. But then we must make sure
1235 * we're not outdoor on an indoor-only channel.
1236 */
1237 if (iftype == NL80211_IFTYPE_P2P_GO &&
1238 wdev->iftype == NL80211_IFTYPE_P2P_GO &&
1239 wdev->links[link_id].ap.beacon_interval &&
1240 !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
1241 other_chan = wdev->links[link_id].ap.chandef.chan;
1242
1243 if (!other_chan)
1244 continue;
1245
1246 if (chan == other_chan)
1247 return true;
1248
1249 if (chan->band != NL80211_BAND_5GHZ &&
1250 chan->band != NL80211_BAND_6GHZ)
1251 continue;
1252
1253 r1 = cfg80211_get_unii(chan->center_freq);
1254 r2 = cfg80211_get_unii(other_chan->center_freq);
1255
1256 if (r1 != -EINVAL && r1 == r2) {
1257 /*
1258 * At some locations channels 149-165 are considered a
1259 * bundle, but at other locations, e.g., Indonesia,
1260 * channels 149-161 are considered a bundle while
1261 * channel 165 is left out and considered to be in a
1262 * different bundle. Thus, in case that there is a
1263 * station interface connected to an AP on channel 165,
1264 * it is assumed that channels 149-161 are allowed for
1265 * GO operations. However, having a station interface
1266 * connected to an AP on channels 149-161, does not
1267 * allow GO operation on channel 165.
1268 */
1269 if (chan->center_freq == 5825 &&
1270 other_chan->center_freq != 5825)
1271 continue;
1272 return true;
1273 }
1274 }
1275
1276 return false;
1277}
1278
1279/*
1280 * Check if the channel can be used under permissive conditions mandated by
1281 * some regulatory bodies, i.e., the channel is marked with
1282 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface
1283 * associated to an AP on the same channel or on the same UNII band
1284 * (assuming that the AP is an authorized master).
1285 * In addition allow operation on a channel on which indoor operation is
1286 * allowed, iff we are currently operating in an indoor environment.
1287 */
1288static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy,
1289 enum nl80211_iftype iftype,
1290 struct ieee80211_channel *chan)
1291{
1292 struct wireless_dev *wdev;
1293 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1294
1295 lockdep_assert_held(&rdev->wiphy.mtx);
1296
1297 if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) ||
1298 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR))
1299 return false;
1300
1301 /* only valid for GO and TDLS off-channel (station/p2p-CL) */
1302 if (iftype != NL80211_IFTYPE_P2P_GO &&
1303 iftype != NL80211_IFTYPE_STATION &&
1304 iftype != NL80211_IFTYPE_P2P_CLIENT)
1305 return false;
1306
1307 if (regulatory_indoor_allowed() &&
1308 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
1309 return true;
1310
1311 if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT))
1312 return false;
1313
1314 /*
1315 * Generally, it is possible to rely on another device/driver to allow
1316 * the IR concurrent relaxation, however, since the device can further
1317 * enforce the relaxation (by doing a similar verifications as this),
1318 * and thus fail the GO instantiation, consider only the interfaces of
1319 * the current registered device.
1320 */
1321 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
1322 bool ret;
1323
1324 wdev_lock(wdev);
1325 ret = cfg80211_ir_permissive_check_wdev(iftype, wdev, chan);
1326 wdev_unlock(wdev);
1327
1328 if (ret)
1329 return ret;
1330 }
1331
1332 return false;
1333}
1334
1335static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy,
1336 struct cfg80211_chan_def *chandef,
1337 enum nl80211_iftype iftype,
1338 bool check_no_ir)
1339{
1340 bool res;
1341 u32 prohibited_flags = IEEE80211_CHAN_DISABLED |
1342 IEEE80211_CHAN_RADAR;
1343
1344 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
1345
1346 if (check_no_ir)
1347 prohibited_flags |= IEEE80211_CHAN_NO_IR;
1348
1349 if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 &&
1350 cfg80211_chandef_dfs_available(wiphy, chandef)) {
1351 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */
1352 prohibited_flags = IEEE80211_CHAN_DISABLED;
1353 }
1354
1355 res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags);
1356
1357 trace_cfg80211_return_bool(res);
1358 return res;
1359}
1360
1361bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
1362 struct cfg80211_chan_def *chandef,
1363 enum nl80211_iftype iftype)
1364{
1365 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true);
1366}
1367EXPORT_SYMBOL(cfg80211_reg_can_beacon);
1368
1369bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy,
1370 struct cfg80211_chan_def *chandef,
1371 enum nl80211_iftype iftype)
1372{
1373 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1374 bool check_no_ir;
1375
1376 lockdep_assert_held(&rdev->wiphy.mtx);
1377
1378 /*
1379 * Under certain conditions suggested by some regulatory bodies a
1380 * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag
1381 * only if such relaxations are not enabled and the conditions are not
1382 * met.
1383 */
1384 check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype,
1385 chandef->chan);
1386
1387 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
1388}
1389EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax);
1390
1391int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
1392 struct cfg80211_chan_def *chandef)
1393{
1394 if (!rdev->ops->set_monitor_channel)
1395 return -EOPNOTSUPP;
1396 if (!cfg80211_has_monitors_only(rdev))
1397 return -EBUSY;
1398
1399 return rdev_set_monitor_channel(rdev, chandef);
1400}
1401
1402bool cfg80211_any_usable_channels(struct wiphy *wiphy,
1403 unsigned long sband_mask,
1404 u32 prohibited_flags)
1405{
1406 int idx;
1407
1408 prohibited_flags |= IEEE80211_CHAN_DISABLED;
1409
1410 for_each_set_bit(idx, &sband_mask, NUM_NL80211_BANDS) {
1411 struct ieee80211_supported_band *sband = wiphy->bands[idx];
1412 int chanidx;
1413
1414 if (!sband)
1415 continue;
1416
1417 for (chanidx = 0; chanidx < sband->n_channels; chanidx++) {
1418 struct ieee80211_channel *chan;
1419
1420 chan = &sband->channels[chanidx];
1421
1422 if (chan->flags & prohibited_flags)
1423 continue;
1424
1425 return true;
1426 }
1427 }
1428
1429 return false;
1430}
1431EXPORT_SYMBOL(cfg80211_any_usable_channels);
1432
1433struct cfg80211_chan_def *wdev_chandef(struct wireless_dev *wdev,
1434 unsigned int link_id)
1435{
1436 /*
1437 * We need to sort out the locking here - in some cases
1438 * where we get here we really just don't care (yet)
1439 * about the valid links, but in others we do. But we
1440 * get here with various driver cases, so we cannot
1441 * easily require the wdev mutex.
1442 */
1443 if (link_id || wdev->valid_links & BIT(0)) {
1444 ASSERT_WDEV_LOCK(wdev);
1445 WARN_ON(!(wdev->valid_links & BIT(link_id)));
1446 }
1447
1448 switch (wdev->iftype) {
1449 case NL80211_IFTYPE_MESH_POINT:
1450 return &wdev->u.mesh.chandef;
1451 case NL80211_IFTYPE_ADHOC:
1452 return &wdev->u.ibss.chandef;
1453 case NL80211_IFTYPE_OCB:
1454 return &wdev->u.ocb.chandef;
1455 case NL80211_IFTYPE_AP:
1456 case NL80211_IFTYPE_P2P_GO:
1457 return &wdev->links[link_id].ap.chandef;
1458 default:
1459 return NULL;
1460 }
1461}
1462EXPORT_SYMBOL(wdev_chandef);