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