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WIP FPC-III support
[linux/fpc-iii.git] / net / wireless / chan.c
blobe4030f1fbc60e5b12e81294eb43906442352cecc
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * This file contains helper code to handle channel
4 * settings and keeping track of what is possible at
5 * any point in time.
6 *
7 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
8 * Copyright 2013-2014 Intel Mobile Communications GmbH
9 * Copyright 2018-2020 Intel Corporation
10 */
11
12 #include <linux/export.h>
13 #include <linux/bitfield.h>
14 #include <net/cfg80211.h>
15 #include "core.h"
16 #include "rdev-ops.h"
17
18 static bool cfg80211_valid_60g_freq(u32 freq)
19 {
20 return freq >= 58320 && freq <= 70200;
21 }
22
23 void cfg80211_chandef_create(struct cfg80211_chan_def *chandef,
24 struct ieee80211_channel *chan,
25 enum nl80211_channel_type chan_type)
26 {
27 if (WARN_ON(!chan))
28 return;
29
30 chandef->chan = chan;
31 chandef->freq1_offset = chan->freq_offset;
32 chandef->center_freq2 = 0;
33 chandef->edmg.bw_config = 0;
34 chandef->edmg.channels = 0;
35
36 switch (chan_type) {
37 case NL80211_CHAN_NO_HT:
38 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
39 chandef->center_freq1 = chan->center_freq;
40 break;
41 case NL80211_CHAN_HT20:
42 chandef->width = NL80211_CHAN_WIDTH_20;
43 chandef->center_freq1 = chan->center_freq;
44 break;
45 case NL80211_CHAN_HT40PLUS:
46 chandef->width = NL80211_CHAN_WIDTH_40;
47 chandef->center_freq1 = chan->center_freq + 10;
48 break;
49 case NL80211_CHAN_HT40MINUS:
50 chandef->width = NL80211_CHAN_WIDTH_40;
51 chandef->center_freq1 = chan->center_freq - 10;
52 break;
53 default:
54 WARN_ON(1);
55 }
56 }
57 EXPORT_SYMBOL(cfg80211_chandef_create);
58
59 static bool cfg80211_edmg_chandef_valid(const struct cfg80211_chan_def *chandef)
60 {
61 int max_contiguous = 0;
62 int num_of_enabled = 0;
63 int contiguous = 0;
64 int i;
65
66 if (!chandef->edmg.channels || !chandef->edmg.bw_config)
67 return false;
68
69 if (!cfg80211_valid_60g_freq(chandef->chan->center_freq))
70 return false;
71
72 for (i = 0; i < 6; i++) {
73 if (chandef->edmg.channels & BIT(i)) {
74 contiguous++;
75 num_of_enabled++;
76 } else {
77 contiguous = 0;
78 }
79
80 max_contiguous = max(contiguous, max_contiguous);
81 }
82 /* basic verification of edmg configuration according to
83 * IEEE P802.11ay/D4.0 section 9.4.2.251
84 */
85 /* check bw_config against contiguous edmg channels */
86 switch (chandef->edmg.bw_config) {
87 case IEEE80211_EDMG_BW_CONFIG_4:
88 case IEEE80211_EDMG_BW_CONFIG_8:
89 case IEEE80211_EDMG_BW_CONFIG_12:
90 if (max_contiguous < 1)
91 return false;
92 break;
93 case IEEE80211_EDMG_BW_CONFIG_5:
94 case IEEE80211_EDMG_BW_CONFIG_9:
95 case IEEE80211_EDMG_BW_CONFIG_13:
96 if (max_contiguous < 2)
97 return false;
98 break;
99 case IEEE80211_EDMG_BW_CONFIG_6:
100 case IEEE80211_EDMG_BW_CONFIG_10:
101 case IEEE80211_EDMG_BW_CONFIG_14:
102 if (max_contiguous < 3)
103 return false;
104 break;
105 case IEEE80211_EDMG_BW_CONFIG_7:
106 case IEEE80211_EDMG_BW_CONFIG_11:
107 case IEEE80211_EDMG_BW_CONFIG_15:
108 if (max_contiguous < 4)
109 return false;
110 break;
111
112 default:
113 return false;
114 }
115
116 /* check bw_config against aggregated (non contiguous) edmg channels */
117 switch (chandef->edmg.bw_config) {
118 case IEEE80211_EDMG_BW_CONFIG_4:
119 case IEEE80211_EDMG_BW_CONFIG_5:
120 case IEEE80211_EDMG_BW_CONFIG_6:
121 case IEEE80211_EDMG_BW_CONFIG_7:
122 break;
123 case IEEE80211_EDMG_BW_CONFIG_8:
124 case IEEE80211_EDMG_BW_CONFIG_9:
125 case IEEE80211_EDMG_BW_CONFIG_10:
126 case IEEE80211_EDMG_BW_CONFIG_11:
127 if (num_of_enabled < 2)
128 return false;
129 break;
130 case IEEE80211_EDMG_BW_CONFIG_12:
131 case IEEE80211_EDMG_BW_CONFIG_13:
132 case IEEE80211_EDMG_BW_CONFIG_14:
133 case IEEE80211_EDMG_BW_CONFIG_15:
134 if (num_of_enabled < 4 || max_contiguous < 2)
135 return false;
136 break;
137 default:
138 return false;
139 }
140
141 return true;
142 }
143
144 static int nl80211_chan_width_to_mhz(enum nl80211_chan_width chan_width)
145 {
146 int mhz;
147
148 switch (chan_width) {
149 case NL80211_CHAN_WIDTH_1:
150 mhz = 1;
151 break;
152 case NL80211_CHAN_WIDTH_2:
153 mhz = 2;
154 break;
155 case NL80211_CHAN_WIDTH_4:
156 mhz = 4;
157 break;
158 case NL80211_CHAN_WIDTH_8:
159 mhz = 8;
160 break;
161 case NL80211_CHAN_WIDTH_16:
162 mhz = 16;
163 break;
164 case NL80211_CHAN_WIDTH_5:
165 mhz = 5;
166 break;
167 case NL80211_CHAN_WIDTH_10:
168 mhz = 10;
169 break;
170 case NL80211_CHAN_WIDTH_20:
171 case NL80211_CHAN_WIDTH_20_NOHT:
172 mhz = 20;
173 break;
174 case NL80211_CHAN_WIDTH_40:
175 mhz = 40;
176 break;
177 case NL80211_CHAN_WIDTH_80P80:
178 case NL80211_CHAN_WIDTH_80:
179 mhz = 80;
180 break;
181 case NL80211_CHAN_WIDTH_160:
182 mhz = 160;
183 break;
184 default:
185 WARN_ON_ONCE(1);
186 return -1;
187 }
188 return mhz;
189 }
190
191 static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c)
192 {
193 return nl80211_chan_width_to_mhz(c->width);
194 }
195
196 bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef)
197 {
198 u32 control_freq, oper_freq;
199 int oper_width, control_width;
200
201 if (!chandef->chan)
202 return false;
203
204 if (chandef->freq1_offset >= 1000)
205 return false;
206
207 control_freq = chandef->chan->center_freq;
208
209 switch (chandef->width) {
210 case NL80211_CHAN_WIDTH_5:
211 case NL80211_CHAN_WIDTH_10:
212 case NL80211_CHAN_WIDTH_20:
213 case NL80211_CHAN_WIDTH_20_NOHT:
214 if (ieee80211_chandef_to_khz(chandef) !=
215 ieee80211_channel_to_khz(chandef->chan))
216 return false;
217 if (chandef->center_freq2)
218 return false;
219 break;
220 case NL80211_CHAN_WIDTH_1:
221 case NL80211_CHAN_WIDTH_2:
222 case NL80211_CHAN_WIDTH_4:
223 case NL80211_CHAN_WIDTH_8:
224 case NL80211_CHAN_WIDTH_16:
225 if (chandef->chan->band != NL80211_BAND_S1GHZ)
226 return false;
227
228 control_freq = ieee80211_channel_to_khz(chandef->chan);
229 oper_freq = ieee80211_chandef_to_khz(chandef);
230 control_width = nl80211_chan_width_to_mhz(
231 ieee80211_s1g_channel_width(
232 chandef->chan));
233 oper_width = cfg80211_chandef_get_width(chandef);
234
235 if (oper_width < 0 || control_width < 0)
236 return false;
237 if (chandef->center_freq2)
238 return false;
239
240 if (control_freq + MHZ_TO_KHZ(control_width) / 2 >
241 oper_freq + MHZ_TO_KHZ(oper_width) / 2)
242 return false;
243
244 if (control_freq - MHZ_TO_KHZ(control_width) / 2 <
245 oper_freq - MHZ_TO_KHZ(oper_width) / 2)
246 return false;
247 break;
248 case NL80211_CHAN_WIDTH_40:
249 if (chandef->center_freq1 != control_freq + 10 &&
250 chandef->center_freq1 != control_freq - 10)
251 return false;
252 if (chandef->center_freq2)
253 return false;
254 break;
255 case NL80211_CHAN_WIDTH_80P80:
256 if (chandef->center_freq1 != control_freq + 30 &&
257 chandef->center_freq1 != control_freq + 10 &&
258 chandef->center_freq1 != control_freq - 10 &&
259 chandef->center_freq1 != control_freq - 30)
260 return false;
261 if (!chandef->center_freq2)
262 return false;
263 /* adjacent is not allowed -- that's a 160 MHz channel */
264 if (chandef->center_freq1 - chandef->center_freq2 == 80 ||
265 chandef->center_freq2 - chandef->center_freq1 == 80)
266 return false;
267 break;
268 case NL80211_CHAN_WIDTH_80:
269 if (chandef->center_freq1 != control_freq + 30 &&
270 chandef->center_freq1 != control_freq + 10 &&
271 chandef->center_freq1 != control_freq - 10 &&
272 chandef->center_freq1 != control_freq - 30)
273 return false;
274 if (chandef->center_freq2)
275 return false;
276 break;
277 case NL80211_CHAN_WIDTH_160:
278 if (chandef->center_freq1 != control_freq + 70 &&
279 chandef->center_freq1 != control_freq + 50 &&
280 chandef->center_freq1 != control_freq + 30 &&
281 chandef->center_freq1 != control_freq + 10 &&
282 chandef->center_freq1 != control_freq - 10 &&
283 chandef->center_freq1 != control_freq - 30 &&
284 chandef->center_freq1 != control_freq - 50 &&
285 chandef->center_freq1 != control_freq - 70)
286 return false;
287 if (chandef->center_freq2)
288 return false;
289 break;
290 default:
291 return false;
292 }
293
294 /* channel 14 is only for IEEE 802.11b */
295 if (chandef->center_freq1 == 2484 &&
296 chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
297 return false;
298
299 if (cfg80211_chandef_is_edmg(chandef) &&
300 !cfg80211_edmg_chandef_valid(chandef))
301 return false;
302
303 return true;
304 }
305 EXPORT_SYMBOL(cfg80211_chandef_valid);
306
307 static void chandef_primary_freqs(const struct cfg80211_chan_def *c,
308 u32 *pri40, u32 *pri80)
309 {
310 int tmp;
311
312 switch (c->width) {
313 case NL80211_CHAN_WIDTH_40:
314 *pri40 = c->center_freq1;
315 *pri80 = 0;
316 break;
317 case NL80211_CHAN_WIDTH_80:
318 case NL80211_CHAN_WIDTH_80P80:
319 *pri80 = c->center_freq1;
320 /* n_P20 */
321 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
322 /* n_P40 */
323 tmp /= 2;
324 /* freq_P40 */
325 *pri40 = c->center_freq1 - 20 + 40 * tmp;
326 break;
327 case NL80211_CHAN_WIDTH_160:
328 /* n_P20 */
329 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
330 /* n_P40 */
331 tmp /= 2;
332 /* freq_P40 */
333 *pri40 = c->center_freq1 - 60 + 40 * tmp;
334 /* n_P80 */
335 tmp /= 2;
336 *pri80 = c->center_freq1 - 40 + 80 * tmp;
337 break;
338 default:
339 WARN_ON_ONCE(1);
340 }
341 }
342
343 const struct cfg80211_chan_def *
344 cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
345 const struct cfg80211_chan_def *c2)
346 {
347 u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80;
348
349 /* If they are identical, return */
350 if (cfg80211_chandef_identical(c1, c2))
351 return c1;
352
353 /* otherwise, must have same control channel */
354 if (c1->chan != c2->chan)
355 return NULL;
356
357 /*
358 * If they have the same width, but aren't identical,
359 * then they can't be compatible.
360 */
361 if (c1->width == c2->width)
362 return NULL;
363
364 /*
365 * can't be compatible if one of them is 5 or 10 MHz,
366 * but they don't have the same width.
367 */
368 if (c1->width == NL80211_CHAN_WIDTH_5 ||
369 c1->width == NL80211_CHAN_WIDTH_10 ||
370 c2->width == NL80211_CHAN_WIDTH_5 ||
371 c2->width == NL80211_CHAN_WIDTH_10)
372 return NULL;
373
374 if (c1->width == NL80211_CHAN_WIDTH_20_NOHT ||
375 c1->width == NL80211_CHAN_WIDTH_20)
376 return c2;
377
378 if (c2->width == NL80211_CHAN_WIDTH_20_NOHT ||
379 c2->width == NL80211_CHAN_WIDTH_20)
380 return c1;
381
382 chandef_primary_freqs(c1, &c1_pri40, &c1_pri80);
383 chandef_primary_freqs(c2, &c2_pri40, &c2_pri80);
384
385 if (c1_pri40 != c2_pri40)
386 return NULL;
387
388 WARN_ON(!c1_pri80 && !c2_pri80);
389 if (c1_pri80 && c2_pri80 && c1_pri80 != c2_pri80)
390 return NULL;
391
392 if (c1->width > c2->width)
393 return c1;
394 return c2;
395 }
396 EXPORT_SYMBOL(cfg80211_chandef_compatible);
397
398 static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq,
399 u32 bandwidth,
400 enum nl80211_dfs_state dfs_state)
401 {
402 struct ieee80211_channel *c;
403 u32 freq;
404
405 for (freq = center_freq - bandwidth/2 + 10;
406 freq <= center_freq + bandwidth/2 - 10;
407 freq += 20) {
408 c = ieee80211_get_channel(wiphy, freq);
409 if (!c || !(c->flags & IEEE80211_CHAN_RADAR))
410 continue;
411
412 c->dfs_state = dfs_state;
413 c->dfs_state_entered = jiffies;
414 }
415 }
416
417 void cfg80211_set_dfs_state(struct wiphy *wiphy,
418 const struct cfg80211_chan_def *chandef,
419 enum nl80211_dfs_state dfs_state)
420 {
421 int width;
422
423 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
424 return;
425
426 width = cfg80211_chandef_get_width(chandef);
427 if (width < 0)
428 return;
429
430 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1,
431 width, dfs_state);
432
433 if (!chandef->center_freq2)
434 return;
435 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2,
436 width, dfs_state);
437 }
438
439 static u32 cfg80211_get_start_freq(u32 center_freq,
440 u32 bandwidth)
441 {
442 u32 start_freq;
443
444 bandwidth = MHZ_TO_KHZ(bandwidth);
445 if (bandwidth <= MHZ_TO_KHZ(20))
446 start_freq = center_freq;
447 else
448 start_freq = center_freq - bandwidth / 2 + MHZ_TO_KHZ(10);
449
450 return start_freq;
451 }
452
453 static u32 cfg80211_get_end_freq(u32 center_freq,
454 u32 bandwidth)
455 {
456 u32 end_freq;
457
458 bandwidth = MHZ_TO_KHZ(bandwidth);
459 if (bandwidth <= MHZ_TO_KHZ(20))
460 end_freq = center_freq;
461 else
462 end_freq = center_freq + bandwidth / 2 - MHZ_TO_KHZ(10);
463
464 return end_freq;
465 }
466
467 static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy,
468 u32 center_freq,
469 u32 bandwidth)
470 {
471 struct ieee80211_channel *c;
472 u32 freq, start_freq, end_freq;
473
474 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
475 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
476
477 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
478 c = ieee80211_get_channel_khz(wiphy, freq);
479 if (!c)
480 return -EINVAL;
481
482 if (c->flags & IEEE80211_CHAN_RADAR)
483 return 1;
484 }
485 return 0;
486 }
487
488
489 int cfg80211_chandef_dfs_required(struct wiphy *wiphy,
490 const struct cfg80211_chan_def *chandef,
491 enum nl80211_iftype iftype)
492 {
493 int width;
494 int ret;
495
496 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
497 return -EINVAL;
498
499 switch (iftype) {
500 case NL80211_IFTYPE_ADHOC:
501 case NL80211_IFTYPE_AP:
502 case NL80211_IFTYPE_P2P_GO:
503 case NL80211_IFTYPE_MESH_POINT:
504 width = cfg80211_chandef_get_width(chandef);
505 if (width < 0)
506 return -EINVAL;
507
508 ret = cfg80211_get_chans_dfs_required(wiphy,
509 ieee80211_chandef_to_khz(chandef),
510 width);
511 if (ret < 0)
512 return ret;
513 else if (ret > 0)
514 return BIT(chandef->width);
515
516 if (!chandef->center_freq2)
517 return 0;
518
519 ret = cfg80211_get_chans_dfs_required(wiphy,
520 MHZ_TO_KHZ(chandef->center_freq2),
521 width);
522 if (ret < 0)
523 return ret;
524 else if (ret > 0)
525 return BIT(chandef->width);
526
527 break;
528 case NL80211_IFTYPE_STATION:
529 case NL80211_IFTYPE_OCB:
530 case NL80211_IFTYPE_P2P_CLIENT:
531 case NL80211_IFTYPE_MONITOR:
532 case NL80211_IFTYPE_AP_VLAN:
533 case NL80211_IFTYPE_P2P_DEVICE:
534 case NL80211_IFTYPE_NAN:
535 break;
536 case NL80211_IFTYPE_WDS:
537 case NL80211_IFTYPE_UNSPECIFIED:
538 case NUM_NL80211_IFTYPES:
539 WARN_ON(1);
540 }
541
542 return 0;
543 }
544 EXPORT_SYMBOL(cfg80211_chandef_dfs_required);
545
546 static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy,
547 u32 center_freq,
548 u32 bandwidth)
549 {
550 struct ieee80211_channel *c;
551 u32 freq, start_freq, end_freq;
552 int count = 0;
553
554 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
555 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
556
557 /*
558 * Check entire range of channels for the bandwidth.
559 * Check all channels are DFS channels (DFS_USABLE or
560 * DFS_AVAILABLE). Return number of usable channels
561 * (require CAC). Allow DFS and non-DFS channel mix.
562 */
563 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
564 c = ieee80211_get_channel_khz(wiphy, freq);
565 if (!c)
566 return -EINVAL;
567
568 if (c->flags & IEEE80211_CHAN_DISABLED)
569 return -EINVAL;
570
571 if (c->flags & IEEE80211_CHAN_RADAR) {
572 if (c->dfs_state == NL80211_DFS_UNAVAILABLE)
573 return -EINVAL;
574
575 if (c->dfs_state == NL80211_DFS_USABLE)
576 count++;
577 }
578 }
579
580 return count;
581 }
582
583 bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
584 const struct cfg80211_chan_def *chandef)
585 {
586 int width;
587 int r1, r2 = 0;
588
589 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
590 return false;
591
592 width = cfg80211_chandef_get_width(chandef);
593 if (width < 0)
594 return false;
595
596 r1 = cfg80211_get_chans_dfs_usable(wiphy,
597 MHZ_TO_KHZ(chandef->center_freq1),
598 width);
599
600 if (r1 < 0)
601 return false;
602
603 switch (chandef->width) {
604 case NL80211_CHAN_WIDTH_80P80:
605 WARN_ON(!chandef->center_freq2);
606 r2 = cfg80211_get_chans_dfs_usable(wiphy,
607 MHZ_TO_KHZ(chandef->center_freq2),
608 width);
609 if (r2 < 0)
610 return false;
611 break;
612 default:
613 WARN_ON(chandef->center_freq2);
614 break;
615 }
616
617 return (r1 + r2 > 0);
618 }
619
620 /*
621 * Checks if center frequency of chan falls with in the bandwidth
622 * range of chandef.
623 */
624 bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef,
625 struct ieee80211_channel *chan)
626 {
627 int width;
628 u32 freq;
629
630 if (chandef->chan->center_freq == chan->center_freq)
631 return true;
632
633 width = cfg80211_chandef_get_width(chandef);
634 if (width <= 20)
635 return false;
636
637 for (freq = chandef->center_freq1 - width / 2 + 10;
638 freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) {
639 if (chan->center_freq == freq)
640 return true;
641 }
642
643 if (!chandef->center_freq2)
644 return false;
645
646 for (freq = chandef->center_freq2 - width / 2 + 10;
647 freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) {
648 if (chan->center_freq == freq)
649 return true;
650 }
651
652 return false;
653 }
654
655 bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev)
656 {
657 bool active = false;
658
659 ASSERT_WDEV_LOCK(wdev);
660
661 if (!wdev->chandef.chan)
662 return false;
663
664 switch (wdev->iftype) {
665 case NL80211_IFTYPE_AP:
666 case NL80211_IFTYPE_P2P_GO:
667 active = wdev->beacon_interval != 0;
668 break;
669 case NL80211_IFTYPE_ADHOC:
670 active = wdev->ssid_len != 0;
671 break;
672 case NL80211_IFTYPE_MESH_POINT:
673 active = wdev->mesh_id_len != 0;
674 break;
675 case NL80211_IFTYPE_STATION:
676 case NL80211_IFTYPE_OCB:
677 case NL80211_IFTYPE_P2P_CLIENT:
678 case NL80211_IFTYPE_MONITOR:
679 case NL80211_IFTYPE_AP_VLAN:
680 case NL80211_IFTYPE_P2P_DEVICE:
681 /* Can NAN type be considered as beaconing interface? */
682 case NL80211_IFTYPE_NAN:
683 break;
684 case NL80211_IFTYPE_UNSPECIFIED:
685 case NL80211_IFTYPE_WDS:
686 case NUM_NL80211_IFTYPES:
687 WARN_ON(1);
688 }
689
690 return active;
691 }
692
693 static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy,
694 struct ieee80211_channel *chan)
695 {
696 struct wireless_dev *wdev;
697
698 list_for_each_entry(wdev, &wiphy->wdev_list, list) {
699 wdev_lock(wdev);
700 if (!cfg80211_beaconing_iface_active(wdev)) {
701 wdev_unlock(wdev);
702 continue;
703 }
704
705 if (cfg80211_is_sub_chan(&wdev->chandef, chan)) {
706 wdev_unlock(wdev);
707 return true;
708 }
709 wdev_unlock(wdev);
710 }
711
712 return false;
713 }
714
715 bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy,
716 struct ieee80211_channel *chan)
717 {
718 struct cfg80211_registered_device *rdev;
719
720 ASSERT_RTNL();
721
722 if (!(chan->flags & IEEE80211_CHAN_RADAR))
723 return false;
724
725 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
726 if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))
727 continue;
728
729 if (cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan))
730 return true;
731 }
732
733 return false;
734 }
735
736 static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy,
737 u32 center_freq,
738 u32 bandwidth)
739 {
740 struct ieee80211_channel *c;
741 u32 freq, start_freq, end_freq;
742 bool dfs_offload;
743
744 dfs_offload = wiphy_ext_feature_isset(wiphy,
745 NL80211_EXT_FEATURE_DFS_OFFLOAD);
746
747 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
748 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
749
750 /*
751 * Check entire range of channels for the bandwidth.
752 * If any channel in between is disabled or has not
753 * had gone through CAC return false
754 */
755 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
756 c = ieee80211_get_channel_khz(wiphy, freq);
757 if (!c)
758 return false;
759
760 if (c->flags & IEEE80211_CHAN_DISABLED)
761 return false;
762
763 if ((c->flags & IEEE80211_CHAN_RADAR) &&
764 (c->dfs_state != NL80211_DFS_AVAILABLE) &&
765 !(c->dfs_state == NL80211_DFS_USABLE && dfs_offload))
766 return false;
767 }
768
769 return true;
770 }
771
772 static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy,
773 const struct cfg80211_chan_def *chandef)
774 {
775 int width;
776 int r;
777
778 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
779 return false;
780
781 width = cfg80211_chandef_get_width(chandef);
782 if (width < 0)
783 return false;
784
785 r = cfg80211_get_chans_dfs_available(wiphy,
786 MHZ_TO_KHZ(chandef->center_freq1),
787 width);
788
789 /* If any of channels unavailable for cf1 just return */
790 if (!r)
791 return r;
792
793 switch (chandef->width) {
794 case NL80211_CHAN_WIDTH_80P80:
795 WARN_ON(!chandef->center_freq2);
796 r = cfg80211_get_chans_dfs_available(wiphy,
797 MHZ_TO_KHZ(chandef->center_freq2),
798 width);
799 break;
800 default:
801 WARN_ON(chandef->center_freq2);
802 break;
803 }
804
805 return r;
806 }
807
808 static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy,
809 u32 center_freq,
810 u32 bandwidth)
811 {
812 struct ieee80211_channel *c;
813 u32 start_freq, end_freq, freq;
814 unsigned int dfs_cac_ms = 0;
815
816 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
817 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
818
819 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
820 c = ieee80211_get_channel_khz(wiphy, freq);
821 if (!c)
822 return 0;
823
824 if (c->flags & IEEE80211_CHAN_DISABLED)
825 return 0;
826
827 if (!(c->flags & IEEE80211_CHAN_RADAR))
828 continue;
829
830 if (c->dfs_cac_ms > dfs_cac_ms)
831 dfs_cac_ms = c->dfs_cac_ms;
832 }
833
834 return dfs_cac_ms;
835 }
836
837 unsigned int
838 cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
839 const struct cfg80211_chan_def *chandef)
840 {
841 int width;
842 unsigned int t1 = 0, t2 = 0;
843
844 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
845 return 0;
846
847 width = cfg80211_chandef_get_width(chandef);
848 if (width < 0)
849 return 0;
850
851 t1 = cfg80211_get_chans_dfs_cac_time(wiphy,
852 MHZ_TO_KHZ(chandef->center_freq1),
853 width);
854
855 if (!chandef->center_freq2)
856 return t1;
857
858 t2 = cfg80211_get_chans_dfs_cac_time(wiphy,
859 MHZ_TO_KHZ(chandef->center_freq2),
860 width);
861
862 return max(t1, t2);
863 }
864
865 static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
866 u32 center_freq, u32 bandwidth,
867 u32 prohibited_flags)
868 {
869 struct ieee80211_channel *c;
870 u32 freq, start_freq, end_freq;
871
872 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
873 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
874
875 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
876 c = ieee80211_get_channel_khz(wiphy, freq);
877 if (!c || c->flags & prohibited_flags)
878 return false;
879 }
880
881 return true;
882 }
883
884 /* check if the operating channels are valid and supported */
885 static bool cfg80211_edmg_usable(struct wiphy *wiphy, u8 edmg_channels,
886 enum ieee80211_edmg_bw_config edmg_bw_config,
887 int primary_channel,
888 struct ieee80211_edmg *edmg_cap)
889 {
890 struct ieee80211_channel *chan;
891 int i, freq;
892 int channels_counter = 0;
893
894 if (!edmg_channels && !edmg_bw_config)
895 return true;
896
897 if ((!edmg_channels && edmg_bw_config) ||
898 (edmg_channels && !edmg_bw_config))
899 return false;
900
901 if (!(edmg_channels & BIT(primary_channel - 1)))
902 return false;
903
904 /* 60GHz channels 1..6 */
905 for (i = 0; i < 6; i++) {
906 if (!(edmg_channels & BIT(i)))
907 continue;
908
909 if (!(edmg_cap->channels & BIT(i)))
910 return false;
911
912 channels_counter++;
913
914 freq = ieee80211_channel_to_frequency(i + 1,
915 NL80211_BAND_60GHZ);
916 chan = ieee80211_get_channel(wiphy, freq);
917 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
918 return false;
919 }
920
921 /* IEEE802.11 allows max 4 channels */
922 if (channels_counter > 4)
923 return false;
924
925 /* check bw_config is a subset of what driver supports
926 * (see IEEE P802.11ay/D4.0 section 9.4.2.251, Table 13)
927 */
928 if ((edmg_bw_config % 4) > (edmg_cap->bw_config % 4))
929 return false;
930
931 if (edmg_bw_config > edmg_cap->bw_config)
932 return false;
933
934 return true;
935 }
936
937 bool cfg80211_chandef_usable(struct wiphy *wiphy,
938 const struct cfg80211_chan_def *chandef,
939 u32 prohibited_flags)
940 {
941 struct ieee80211_sta_ht_cap *ht_cap;
942 struct ieee80211_sta_vht_cap *vht_cap;
943 struct ieee80211_edmg *edmg_cap;
944 u32 width, control_freq, cap;
945 bool support_80_80 = false;
946
947 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
948 return false;
949
950 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap;
951 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap;
952 edmg_cap = &wiphy->bands[chandef->chan->band]->edmg_cap;
953
954 if (edmg_cap->channels &&
955 !cfg80211_edmg_usable(wiphy,
956 chandef->edmg.channels,
957 chandef->edmg.bw_config,
958 chandef->chan->hw_value,
959 edmg_cap))
960 return false;
961
962 control_freq = chandef->chan->center_freq;
963
964 switch (chandef->width) {
965 case NL80211_CHAN_WIDTH_1:
966 width = 1;
967 break;
968 case NL80211_CHAN_WIDTH_2:
969 width = 2;
970 break;
971 case NL80211_CHAN_WIDTH_4:
972 width = 4;
973 break;
974 case NL80211_CHAN_WIDTH_8:
975 width = 8;
976 break;
977 case NL80211_CHAN_WIDTH_16:
978 width = 16;
979 break;
980 case NL80211_CHAN_WIDTH_5:
981 width = 5;
982 break;
983 case NL80211_CHAN_WIDTH_10:
984 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ;
985 width = 10;
986 break;
987 case NL80211_CHAN_WIDTH_20:
988 if (!ht_cap->ht_supported &&
989 chandef->chan->band != NL80211_BAND_6GHZ)
990 return false;
991 fallthrough;
992 case NL80211_CHAN_WIDTH_20_NOHT:
993 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ;
994 width = 20;
995 break;
996 case NL80211_CHAN_WIDTH_40:
997 width = 40;
998 if (chandef->chan->band == NL80211_BAND_6GHZ)
999 break;
1000 if (!ht_cap->ht_supported)
1001 return false;
1002 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
1003 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
1004 return false;
1005 if (chandef->center_freq1 < control_freq &&
1006 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
1007 return false;
1008 if (chandef->center_freq1 > control_freq &&
1009 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
1010 return false;
1011 break;
1012 case NL80211_CHAN_WIDTH_80P80:
1013 cap = vht_cap->cap;
1014 support_80_80 =
1015 (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) ||
1016 (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
1017 cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) ||
1018 u32_get_bits(cap, IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) > 1;
1019 if (chandef->chan->band != NL80211_BAND_6GHZ && !support_80_80)
1020 return false;
1021 fallthrough;
1022 case NL80211_CHAN_WIDTH_80:
1023 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ;
1024 width = 80;
1025 if (chandef->chan->band == NL80211_BAND_6GHZ)
1026 break;
1027 if (!vht_cap->vht_supported)
1028 return false;
1029 break;
1030 case NL80211_CHAN_WIDTH_160:
1031 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ;
1032 width = 160;
1033 if (chandef->chan->band == NL80211_BAND_6GHZ)
1034 break;
1035 if (!vht_cap->vht_supported)
1036 return false;
1037 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
1038 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
1039 cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ &&
1040 !(vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK))
1041 return false;
1042 break;
1043 default:
1044 WARN_ON_ONCE(1);
1045 return false;
1046 }
1047
1048 /*
1049 * TODO: What if there are only certain 80/160/80+80 MHz channels
1050 * allowed by the driver, or only certain combinations?
1051 * For 40 MHz the driver can set the NO_HT40 flags, but for
1052 * 80/160 MHz and in particular 80+80 MHz this isn't really
1053 * feasible and we only have NO_80MHZ/NO_160MHZ so far but
1054 * no way to cover 80+80 MHz or more complex restrictions.
1055 * Note that such restrictions also need to be advertised to
1056 * userspace, for example for P2P channel selection.
1057 */
1058
1059 if (width > 20)
1060 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
1061
1062 /* 5 and 10 MHz are only defined for the OFDM PHY */
1063 if (width < 20)
1064 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
1065
1066
1067 if (!cfg80211_secondary_chans_ok(wiphy,
1068 ieee80211_chandef_to_khz(chandef),
1069 width, prohibited_flags))
1070 return false;
1071
1072 if (!chandef->center_freq2)
1073 return true;
1074 return cfg80211_secondary_chans_ok(wiphy,
1075 MHZ_TO_KHZ(chandef->center_freq2),
1076 width, prohibited_flags);
1077 }
1078 EXPORT_SYMBOL(cfg80211_chandef_usable);
1079
1080 /*
1081 * Check if the channel can be used under permissive conditions mandated by
1082 * some regulatory bodies, i.e., the channel is marked with
1083 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface
1084 * associated to an AP on the same channel or on the same UNII band
1085 * (assuming that the AP is an authorized master).
1086 * In addition allow operation on a channel on which indoor operation is
1087 * allowed, iff we are currently operating in an indoor environment.
1088 */
1089 static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy,
1090 enum nl80211_iftype iftype,
1091 struct ieee80211_channel *chan)
1092 {
1093 struct wireless_dev *wdev;
1094 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1095
1096 ASSERT_RTNL();
1097
1098 if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) ||
1099 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR))
1100 return false;
1101
1102 /* only valid for GO and TDLS off-channel (station/p2p-CL) */
1103 if (iftype != NL80211_IFTYPE_P2P_GO &&
1104 iftype != NL80211_IFTYPE_STATION &&
1105 iftype != NL80211_IFTYPE_P2P_CLIENT)
1106 return false;
1107
1108 if (regulatory_indoor_allowed() &&
1109 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
1110 return true;
1111
1112 if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT))
1113 return false;
1114
1115 /*
1116 * Generally, it is possible to rely on another device/driver to allow
1117 * the IR concurrent relaxation, however, since the device can further
1118 * enforce the relaxation (by doing a similar verifications as this),
1119 * and thus fail the GO instantiation, consider only the interfaces of
1120 * the current registered device.
1121 */
1122 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
1123 struct ieee80211_channel *other_chan = NULL;
1124 int r1, r2;
1125
1126 wdev_lock(wdev);
1127 if (wdev->iftype == NL80211_IFTYPE_STATION &&
1128 wdev->current_bss)
1129 other_chan = wdev->current_bss->pub.channel;
1130
1131 /*
1132 * If a GO already operates on the same GO_CONCURRENT channel,
1133 * this one (maybe the same one) can beacon as well. We allow
1134 * the operation even if the station we relied on with
1135 * GO_CONCURRENT is disconnected now. But then we must make sure
1136 * we're not outdoor on an indoor-only channel.
1137 */
1138 if (iftype == NL80211_IFTYPE_P2P_GO &&
1139 wdev->iftype == NL80211_IFTYPE_P2P_GO &&
1140 wdev->beacon_interval &&
1141 !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
1142 other_chan = wdev->chandef.chan;
1143 wdev_unlock(wdev);
1144
1145 if (!other_chan)
1146 continue;
1147
1148 if (chan == other_chan)
1149 return true;
1150
1151 if (chan->band != NL80211_BAND_5GHZ &&
1152 chan->band != NL80211_BAND_6GHZ)
1153 continue;
1154
1155 r1 = cfg80211_get_unii(chan->center_freq);
1156 r2 = cfg80211_get_unii(other_chan->center_freq);
1157
1158 if (r1 != -EINVAL && r1 == r2) {
1159 /*
1160 * At some locations channels 149-165 are considered a
1161 * bundle, but at other locations, e.g., Indonesia,
1162 * channels 149-161 are considered a bundle while
1163 * channel 165 is left out and considered to be in a
1164 * different bundle. Thus, in case that there is a
1165 * station interface connected to an AP on channel 165,
1166 * it is assumed that channels 149-161 are allowed for
1167 * GO operations. However, having a station interface
1168 * connected to an AP on channels 149-161, does not
1169 * allow GO operation on channel 165.
1170 */
1171 if (chan->center_freq == 5825 &&
1172 other_chan->center_freq != 5825)
1173 continue;
1174 return true;
1175 }
1176 }
1177
1178 return false;
1179 }
1180
1181 static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy,
1182 struct cfg80211_chan_def *chandef,
1183 enum nl80211_iftype iftype,
1184 bool check_no_ir)
1185 {
1186 bool res;
1187 u32 prohibited_flags = IEEE80211_CHAN_DISABLED |
1188 IEEE80211_CHAN_RADAR;
1189
1190 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
1191
1192 if (check_no_ir)
1193 prohibited_flags |= IEEE80211_CHAN_NO_IR;
1194
1195 if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 &&
1196 cfg80211_chandef_dfs_available(wiphy, chandef)) {
1197 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */
1198 prohibited_flags = IEEE80211_CHAN_DISABLED;
1199 }
1200
1201 res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags);
1202
1203 trace_cfg80211_return_bool(res);
1204 return res;
1205 }
1206
1207 bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
1208 struct cfg80211_chan_def *chandef,
1209 enum nl80211_iftype iftype)
1210 {
1211 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true);
1212 }
1213 EXPORT_SYMBOL(cfg80211_reg_can_beacon);
1214
1215 bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy,
1216 struct cfg80211_chan_def *chandef,
1217 enum nl80211_iftype iftype)
1218 {
1219 bool check_no_ir;
1220
1221 ASSERT_RTNL();
1222
1223 /*
1224 * Under certain conditions suggested by some regulatory bodies a
1225 * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag
1226 * only if such relaxations are not enabled and the conditions are not
1227 * met.
1228 */
1229 check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype,
1230 chandef->chan);
1231
1232 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
1233 }
1234 EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax);
1235
1236 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
1237 struct cfg80211_chan_def *chandef)
1238 {
1239 if (!rdev->ops->set_monitor_channel)
1240 return -EOPNOTSUPP;
1241 if (!cfg80211_has_monitors_only(rdev))
1242 return -EBUSY;
1243
1244 return rdev_set_monitor_channel(rdev, chandef);
1245 }
1246
1247 void
1248 cfg80211_get_chan_state(struct wireless_dev *wdev,
1249 struct ieee80211_channel **chan,
1250 enum cfg80211_chan_mode *chanmode,
1251 u8 *radar_detect)
1252 {
1253 int ret;
1254
1255 *chan = NULL;
1256 *chanmode = CHAN_MODE_UNDEFINED;
1257
1258 ASSERT_WDEV_LOCK(wdev);
1259
1260 if (wdev->netdev && !netif_running(wdev->netdev))
1261 return;
1262
1263 switch (wdev->iftype) {
1264 case NL80211_IFTYPE_ADHOC:
1265 if (wdev->current_bss) {
1266 *chan = wdev->current_bss->pub.channel;
1267 *chanmode = (wdev->ibss_fixed &&
1268 !wdev->ibss_dfs_possible)
1269 ? CHAN_MODE_SHARED
1270 : CHAN_MODE_EXCLUSIVE;
1271
1272 /* consider worst-case - IBSS can try to return to the
1273 * original user-specified channel as creator */
1274 if (wdev->ibss_dfs_possible)
1275 *radar_detect |= BIT(wdev->chandef.width);
1276 return;
1277 }
1278 break;
1279 case NL80211_IFTYPE_STATION:
1280 case NL80211_IFTYPE_P2P_CLIENT:
1281 if (wdev->current_bss) {
1282 *chan = wdev->current_bss->pub.channel;
1283 *chanmode = CHAN_MODE_SHARED;
1284 return;
1285 }
1286 break;
1287 case NL80211_IFTYPE_AP:
1288 case NL80211_IFTYPE_P2P_GO:
1289 if (wdev->cac_started) {
1290 *chan = wdev->chandef.chan;
1291 *chanmode = CHAN_MODE_SHARED;
1292 *radar_detect |= BIT(wdev->chandef.width);
1293 } else if (wdev->beacon_interval) {
1294 *chan = wdev->chandef.chan;
1295 *chanmode = CHAN_MODE_SHARED;
1296
1297 ret = cfg80211_chandef_dfs_required(wdev->wiphy,
1298 &wdev->chandef,
1299 wdev->iftype);
1300 WARN_ON(ret < 0);
1301 if (ret > 0)
1302 *radar_detect |= BIT(wdev->chandef.width);
1303 }
1304 return;
1305 case NL80211_IFTYPE_MESH_POINT:
1306 if (wdev->mesh_id_len) {
1307 *chan = wdev->chandef.chan;
1308 *chanmode = CHAN_MODE_SHARED;
1309
1310 ret = cfg80211_chandef_dfs_required(wdev->wiphy,
1311 &wdev->chandef,
1312 wdev->iftype);
1313 WARN_ON(ret < 0);
1314 if (ret > 0)
1315 *radar_detect |= BIT(wdev->chandef.width);
1316 }
1317 return;
1318 case NL80211_IFTYPE_OCB:
1319 if (wdev->chandef.chan) {
1320 *chan = wdev->chandef.chan;
1321 *chanmode = CHAN_MODE_SHARED;
1322 return;
1323 }
1324 break;
1325 case NL80211_IFTYPE_MONITOR:
1326 case NL80211_IFTYPE_AP_VLAN:
1327 case NL80211_IFTYPE_P2P_DEVICE:
1328 case NL80211_IFTYPE_NAN:
1329 /* these interface types don't really have a channel */
1330 return;
1331 case NL80211_IFTYPE_UNSPECIFIED:
1332 case NL80211_IFTYPE_WDS:
1333 case NUM_NL80211_IFTYPES:
1334 WARN_ON(1);
1335 }
1336 }
Linux with added FPC-III support