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Linux 4.8-rc8
[linux/fpc-iii.git] / net / wireless / chan.c
blob0f506220a3bde0e4b73c043fa9ea6a7f6b404ed0
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 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 */
9
10 #include <linux/export.h>
11 #include <net/cfg80211.h>
12 #include "core.h"
13 #include "rdev-ops.h"
14
15 void cfg80211_chandef_create(struct cfg80211_chan_def *chandef,
16 struct ieee80211_channel *chan,
17 enum nl80211_channel_type chan_type)
18 {
19 if (WARN_ON(!chan))
20 return;
21
22 chandef->chan = chan;
23 chandef->center_freq2 = 0;
24
25 switch (chan_type) {
26 case NL80211_CHAN_NO_HT:
27 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
28 chandef->center_freq1 = chan->center_freq;
29 break;
30 case NL80211_CHAN_HT20:
31 chandef->width = NL80211_CHAN_WIDTH_20;
32 chandef->center_freq1 = chan->center_freq;
33 break;
34 case NL80211_CHAN_HT40PLUS:
35 chandef->width = NL80211_CHAN_WIDTH_40;
36 chandef->center_freq1 = chan->center_freq + 10;
37 break;
38 case NL80211_CHAN_HT40MINUS:
39 chandef->width = NL80211_CHAN_WIDTH_40;
40 chandef->center_freq1 = chan->center_freq - 10;
41 break;
42 default:
43 WARN_ON(1);
44 }
45 }
46 EXPORT_SYMBOL(cfg80211_chandef_create);
47
48 bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef)
49 {
50 u32 control_freq;
51
52 if (!chandef->chan)
53 return false;
54
55 control_freq = chandef->chan->center_freq;
56
57 switch (chandef->width) {
58 case NL80211_CHAN_WIDTH_5:
59 case NL80211_CHAN_WIDTH_10:
60 case NL80211_CHAN_WIDTH_20:
61 case NL80211_CHAN_WIDTH_20_NOHT:
62 if (chandef->center_freq1 != control_freq)
63 return false;
64 if (chandef->center_freq2)
65 return false;
66 break;
67 case NL80211_CHAN_WIDTH_40:
68 if (chandef->center_freq1 != control_freq + 10 &&
69 chandef->center_freq1 != control_freq - 10)
70 return false;
71 if (chandef->center_freq2)
72 return false;
73 break;
74 case NL80211_CHAN_WIDTH_80P80:
75 if (chandef->center_freq1 != control_freq + 30 &&
76 chandef->center_freq1 != control_freq + 10 &&
77 chandef->center_freq1 != control_freq - 10 &&
78 chandef->center_freq1 != control_freq - 30)
79 return false;
80 if (!chandef->center_freq2)
81 return false;
82 /* adjacent is not allowed -- that's a 160 MHz channel */
83 if (chandef->center_freq1 - chandef->center_freq2 == 80 ||
84 chandef->center_freq2 - chandef->center_freq1 == 80)
85 return false;
86 break;
87 case NL80211_CHAN_WIDTH_80:
88 if (chandef->center_freq1 != control_freq + 30 &&
89 chandef->center_freq1 != control_freq + 10 &&
90 chandef->center_freq1 != control_freq - 10 &&
91 chandef->center_freq1 != control_freq - 30)
92 return false;
93 if (chandef->center_freq2)
94 return false;
95 break;
96 case NL80211_CHAN_WIDTH_160:
97 if (chandef->center_freq1 != control_freq + 70 &&
98 chandef->center_freq1 != control_freq + 50 &&
99 chandef->center_freq1 != control_freq + 30 &&
100 chandef->center_freq1 != control_freq + 10 &&
101 chandef->center_freq1 != control_freq - 10 &&
102 chandef->center_freq1 != control_freq - 30 &&
103 chandef->center_freq1 != control_freq - 50 &&
104 chandef->center_freq1 != control_freq - 70)
105 return false;
106 if (chandef->center_freq2)
107 return false;
108 break;
109 default:
110 return false;
111 }
112
113 return true;
114 }
115 EXPORT_SYMBOL(cfg80211_chandef_valid);
116
117 static void chandef_primary_freqs(const struct cfg80211_chan_def *c,
118 u32 *pri40, u32 *pri80)
119 {
120 int tmp;
121
122 switch (c->width) {
123 case NL80211_CHAN_WIDTH_40:
124 *pri40 = c->center_freq1;
125 *pri80 = 0;
126 break;
127 case NL80211_CHAN_WIDTH_80:
128 case NL80211_CHAN_WIDTH_80P80:
129 *pri80 = c->center_freq1;
130 /* n_P20 */
131 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
132 /* n_P40 */
133 tmp /= 2;
134 /* freq_P40 */
135 *pri40 = c->center_freq1 - 20 + 40 * tmp;
136 break;
137 case NL80211_CHAN_WIDTH_160:
138 /* n_P20 */
139 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
140 /* n_P40 */
141 tmp /= 2;
142 /* freq_P40 */
143 *pri40 = c->center_freq1 - 60 + 40 * tmp;
144 /* n_P80 */
145 tmp /= 2;
146 *pri80 = c->center_freq1 - 40 + 80 * tmp;
147 break;
148 default:
149 WARN_ON_ONCE(1);
150 }
151 }
152
153 static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c)
154 {
155 int width;
156
157 switch (c->width) {
158 case NL80211_CHAN_WIDTH_5:
159 width = 5;
160 break;
161 case NL80211_CHAN_WIDTH_10:
162 width = 10;
163 break;
164 case NL80211_CHAN_WIDTH_20:
165 case NL80211_CHAN_WIDTH_20_NOHT:
166 width = 20;
167 break;
168 case NL80211_CHAN_WIDTH_40:
169 width = 40;
170 break;
171 case NL80211_CHAN_WIDTH_80P80:
172 case NL80211_CHAN_WIDTH_80:
173 width = 80;
174 break;
175 case NL80211_CHAN_WIDTH_160:
176 width = 160;
177 break;
178 default:
179 WARN_ON_ONCE(1);
180 return -1;
181 }
182 return width;
183 }
184
185 const struct cfg80211_chan_def *
186 cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
187 const struct cfg80211_chan_def *c2)
188 {
189 u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80;
190
191 /* If they are identical, return */
192 if (cfg80211_chandef_identical(c1, c2))
193 return c1;
194
195 /* otherwise, must have same control channel */
196 if (c1->chan != c2->chan)
197 return NULL;
198
199 /*
200 * If they have the same width, but aren't identical,
201 * then they can't be compatible.
202 */
203 if (c1->width == c2->width)
204 return NULL;
205
206 /*
207 * can't be compatible if one of them is 5 or 10 MHz,
208 * but they don't have the same width.
209 */
210 if (c1->width == NL80211_CHAN_WIDTH_5 ||
211 c1->width == NL80211_CHAN_WIDTH_10 ||
212 c2->width == NL80211_CHAN_WIDTH_5 ||
213 c2->width == NL80211_CHAN_WIDTH_10)
214 return NULL;
215
216 if (c1->width == NL80211_CHAN_WIDTH_20_NOHT ||
217 c1->width == NL80211_CHAN_WIDTH_20)
218 return c2;
219
220 if (c2->width == NL80211_CHAN_WIDTH_20_NOHT ||
221 c2->width == NL80211_CHAN_WIDTH_20)
222 return c1;
223
224 chandef_primary_freqs(c1, &c1_pri40, &c1_pri80);
225 chandef_primary_freqs(c2, &c2_pri40, &c2_pri80);
226
227 if (c1_pri40 != c2_pri40)
228 return NULL;
229
230 WARN_ON(!c1_pri80 && !c2_pri80);
231 if (c1_pri80 && c2_pri80 && c1_pri80 != c2_pri80)
232 return NULL;
233
234 if (c1->width > c2->width)
235 return c1;
236 return c2;
237 }
238 EXPORT_SYMBOL(cfg80211_chandef_compatible);
239
240 static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq,
241 u32 bandwidth,
242 enum nl80211_dfs_state dfs_state)
243 {
244 struct ieee80211_channel *c;
245 u32 freq;
246
247 for (freq = center_freq - bandwidth/2 + 10;
248 freq <= center_freq + bandwidth/2 - 10;
249 freq += 20) {
250 c = ieee80211_get_channel(wiphy, freq);
251 if (!c || !(c->flags & IEEE80211_CHAN_RADAR))
252 continue;
253
254 c->dfs_state = dfs_state;
255 c->dfs_state_entered = jiffies;
256 }
257 }
258
259 void cfg80211_set_dfs_state(struct wiphy *wiphy,
260 const struct cfg80211_chan_def *chandef,
261 enum nl80211_dfs_state dfs_state)
262 {
263 int width;
264
265 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
266 return;
267
268 width = cfg80211_chandef_get_width(chandef);
269 if (width < 0)
270 return;
271
272 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1,
273 width, dfs_state);
274
275 if (!chandef->center_freq2)
276 return;
277 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2,
278 width, dfs_state);
279 }
280
281 static u32 cfg80211_get_start_freq(u32 center_freq,
282 u32 bandwidth)
283 {
284 u32 start_freq;
285
286 if (bandwidth <= 20)
287 start_freq = center_freq;
288 else
289 start_freq = center_freq - bandwidth/2 + 10;
290
291 return start_freq;
292 }
293
294 static u32 cfg80211_get_end_freq(u32 center_freq,
295 u32 bandwidth)
296 {
297 u32 end_freq;
298
299 if (bandwidth <= 20)
300 end_freq = center_freq;
301 else
302 end_freq = center_freq + bandwidth/2 - 10;
303
304 return end_freq;
305 }
306
307 static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy,
308 u32 center_freq,
309 u32 bandwidth)
310 {
311 struct ieee80211_channel *c;
312 u32 freq, start_freq, end_freq;
313
314 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
315 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
316
317 for (freq = start_freq; freq <= end_freq; freq += 20) {
318 c = ieee80211_get_channel(wiphy, freq);
319 if (!c)
320 return -EINVAL;
321
322 if (c->flags & IEEE80211_CHAN_RADAR)
323 return 1;
324 }
325 return 0;
326 }
327
328
329 int cfg80211_chandef_dfs_required(struct wiphy *wiphy,
330 const struct cfg80211_chan_def *chandef,
331 enum nl80211_iftype iftype)
332 {
333 int width;
334 int ret;
335
336 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
337 return -EINVAL;
338
339 switch (iftype) {
340 case NL80211_IFTYPE_ADHOC:
341 case NL80211_IFTYPE_AP:
342 case NL80211_IFTYPE_P2P_GO:
343 case NL80211_IFTYPE_MESH_POINT:
344 width = cfg80211_chandef_get_width(chandef);
345 if (width < 0)
346 return -EINVAL;
347
348 ret = cfg80211_get_chans_dfs_required(wiphy,
349 chandef->center_freq1,
350 width);
351 if (ret < 0)
352 return ret;
353 else if (ret > 0)
354 return BIT(chandef->width);
355
356 if (!chandef->center_freq2)
357 return 0;
358
359 ret = cfg80211_get_chans_dfs_required(wiphy,
360 chandef->center_freq2,
361 width);
362 if (ret < 0)
363 return ret;
364 else if (ret > 0)
365 return BIT(chandef->width);
366
367 break;
368 case NL80211_IFTYPE_STATION:
369 case NL80211_IFTYPE_OCB:
370 case NL80211_IFTYPE_P2P_CLIENT:
371 case NL80211_IFTYPE_MONITOR:
372 case NL80211_IFTYPE_AP_VLAN:
373 case NL80211_IFTYPE_WDS:
374 case NL80211_IFTYPE_P2P_DEVICE:
375 break;
376 case NL80211_IFTYPE_UNSPECIFIED:
377 case NUM_NL80211_IFTYPES:
378 WARN_ON(1);
379 }
380
381 return 0;
382 }
383 EXPORT_SYMBOL(cfg80211_chandef_dfs_required);
384
385 static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy,
386 u32 center_freq,
387 u32 bandwidth)
388 {
389 struct ieee80211_channel *c;
390 u32 freq, start_freq, end_freq;
391 int count = 0;
392
393 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
394 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
395
396 /*
397 * Check entire range of channels for the bandwidth.
398 * Check all channels are DFS channels (DFS_USABLE or
399 * DFS_AVAILABLE). Return number of usable channels
400 * (require CAC). Allow DFS and non-DFS channel mix.
401 */
402 for (freq = start_freq; freq <= end_freq; freq += 20) {
403 c = ieee80211_get_channel(wiphy, freq);
404 if (!c)
405 return -EINVAL;
406
407 if (c->flags & IEEE80211_CHAN_DISABLED)
408 return -EINVAL;
409
410 if (c->flags & IEEE80211_CHAN_RADAR) {
411 if (c->dfs_state == NL80211_DFS_UNAVAILABLE)
412 return -EINVAL;
413
414 if (c->dfs_state == NL80211_DFS_USABLE)
415 count++;
416 }
417 }
418
419 return count;
420 }
421
422 bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
423 const struct cfg80211_chan_def *chandef)
424 {
425 int width;
426 int r1, r2 = 0;
427
428 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
429 return false;
430
431 width = cfg80211_chandef_get_width(chandef);
432 if (width < 0)
433 return false;
434
435 r1 = cfg80211_get_chans_dfs_usable(wiphy, chandef->center_freq1,
436 width);
437
438 if (r1 < 0)
439 return false;
440
441 switch (chandef->width) {
442 case NL80211_CHAN_WIDTH_80P80:
443 WARN_ON(!chandef->center_freq2);
444 r2 = cfg80211_get_chans_dfs_usable(wiphy,
445 chandef->center_freq2,
446 width);
447 if (r2 < 0)
448 return false;
449 break;
450 default:
451 WARN_ON(chandef->center_freq2);
452 break;
453 }
454
455 return (r1 + r2 > 0);
456 }
457
458
459 static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy,
460 u32 center_freq,
461 u32 bandwidth)
462 {
463 struct ieee80211_channel *c;
464 u32 freq, start_freq, end_freq;
465
466 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
467 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
468
469 /*
470 * Check entire range of channels for the bandwidth.
471 * If any channel in between is disabled or has not
472 * had gone through CAC return false
473 */
474 for (freq = start_freq; freq <= end_freq; freq += 20) {
475 c = ieee80211_get_channel(wiphy, freq);
476 if (!c)
477 return false;
478
479 if (c->flags & IEEE80211_CHAN_DISABLED)
480 return false;
481
482 if ((c->flags & IEEE80211_CHAN_RADAR) &&
483 (c->dfs_state != NL80211_DFS_AVAILABLE))
484 return false;
485 }
486
487 return true;
488 }
489
490 static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy,
491 const struct cfg80211_chan_def *chandef)
492 {
493 int width;
494 int r;
495
496 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
497 return false;
498
499 width = cfg80211_chandef_get_width(chandef);
500 if (width < 0)
501 return false;
502
503 r = cfg80211_get_chans_dfs_available(wiphy, chandef->center_freq1,
504 width);
505
506 /* If any of channels unavailable for cf1 just return */
507 if (!r)
508 return r;
509
510 switch (chandef->width) {
511 case NL80211_CHAN_WIDTH_80P80:
512 WARN_ON(!chandef->center_freq2);
513 r = cfg80211_get_chans_dfs_available(wiphy,
514 chandef->center_freq2,
515 width);
516 break;
517 default:
518 WARN_ON(chandef->center_freq2);
519 break;
520 }
521
522 return r;
523 }
524
525 static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy,
526 u32 center_freq,
527 u32 bandwidth)
528 {
529 struct ieee80211_channel *c;
530 u32 start_freq, end_freq, freq;
531 unsigned int dfs_cac_ms = 0;
532
533 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
534 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
535
536 for (freq = start_freq; freq <= end_freq; freq += 20) {
537 c = ieee80211_get_channel(wiphy, freq);
538 if (!c)
539 return 0;
540
541 if (c->flags & IEEE80211_CHAN_DISABLED)
542 return 0;
543
544 if (!(c->flags & IEEE80211_CHAN_RADAR))
545 continue;
546
547 if (c->dfs_cac_ms > dfs_cac_ms)
548 dfs_cac_ms = c->dfs_cac_ms;
549 }
550
551 return dfs_cac_ms;
552 }
553
554 unsigned int
555 cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
556 const struct cfg80211_chan_def *chandef)
557 {
558 int width;
559 unsigned int t1 = 0, t2 = 0;
560
561 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
562 return 0;
563
564 width = cfg80211_chandef_get_width(chandef);
565 if (width < 0)
566 return 0;
567
568 t1 = cfg80211_get_chans_dfs_cac_time(wiphy,
569 chandef->center_freq1,
570 width);
571
572 if (!chandef->center_freq2)
573 return t1;
574
575 t2 = cfg80211_get_chans_dfs_cac_time(wiphy,
576 chandef->center_freq2,
577 width);
578
579 return max(t1, t2);
580 }
581
582 static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
583 u32 center_freq, u32 bandwidth,
584 u32 prohibited_flags)
585 {
586 struct ieee80211_channel *c;
587 u32 freq, start_freq, end_freq;
588
589 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
590 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
591
592 for (freq = start_freq; freq <= end_freq; freq += 20) {
593 c = ieee80211_get_channel(wiphy, freq);
594 if (!c || c->flags & prohibited_flags)
595 return false;
596 }
597
598 return true;
599 }
600
601 bool cfg80211_chandef_usable(struct wiphy *wiphy,
602 const struct cfg80211_chan_def *chandef,
603 u32 prohibited_flags)
604 {
605 struct ieee80211_sta_ht_cap *ht_cap;
606 struct ieee80211_sta_vht_cap *vht_cap;
607 u32 width, control_freq, cap;
608
609 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
610 return false;
611
612 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap;
613 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap;
614
615 control_freq = chandef->chan->center_freq;
616
617 switch (chandef->width) {
618 case NL80211_CHAN_WIDTH_5:
619 width = 5;
620 break;
621 case NL80211_CHAN_WIDTH_10:
622 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ;
623 width = 10;
624 break;
625 case NL80211_CHAN_WIDTH_20:
626 if (!ht_cap->ht_supported)
627 return false;
628 case NL80211_CHAN_WIDTH_20_NOHT:
629 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ;
630 width = 20;
631 break;
632 case NL80211_CHAN_WIDTH_40:
633 width = 40;
634 if (!ht_cap->ht_supported)
635 return false;
636 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
637 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
638 return false;
639 if (chandef->center_freq1 < control_freq &&
640 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
641 return false;
642 if (chandef->center_freq1 > control_freq &&
643 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
644 return false;
645 break;
646 case NL80211_CHAN_WIDTH_80P80:
647 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
648 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
649 return false;
650 case NL80211_CHAN_WIDTH_80:
651 if (!vht_cap->vht_supported)
652 return false;
653 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ;
654 width = 80;
655 break;
656 case NL80211_CHAN_WIDTH_160:
657 if (!vht_cap->vht_supported)
658 return false;
659 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
660 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
661 cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
662 return false;
663 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ;
664 width = 160;
665 break;
666 default:
667 WARN_ON_ONCE(1);
668 return false;
669 }
670
671 /*
672 * TODO: What if there are only certain 80/160/80+80 MHz channels
673 * allowed by the driver, or only certain combinations?
674 * For 40 MHz the driver can set the NO_HT40 flags, but for
675 * 80/160 MHz and in particular 80+80 MHz this isn't really
676 * feasible and we only have NO_80MHZ/NO_160MHZ so far but
677 * no way to cover 80+80 MHz or more complex restrictions.
678 * Note that such restrictions also need to be advertised to
679 * userspace, for example for P2P channel selection.
680 */
681
682 if (width > 20)
683 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
684
685 /* 5 and 10 MHz are only defined for the OFDM PHY */
686 if (width < 20)
687 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
688
689
690 if (!cfg80211_secondary_chans_ok(wiphy, chandef->center_freq1,
691 width, prohibited_flags))
692 return false;
693
694 if (!chandef->center_freq2)
695 return true;
696 return cfg80211_secondary_chans_ok(wiphy, chandef->center_freq2,
697 width, prohibited_flags);
698 }
699 EXPORT_SYMBOL(cfg80211_chandef_usable);
700
701 /*
702 * Check if the channel can be used under permissive conditions mandated by
703 * some regulatory bodies, i.e., the channel is marked with
704 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface
705 * associated to an AP on the same channel or on the same UNII band
706 * (assuming that the AP is an authorized master).
707 * In addition allow operation on a channel on which indoor operation is
708 * allowed, iff we are currently operating in an indoor environment.
709 */
710 static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy,
711 enum nl80211_iftype iftype,
712 struct ieee80211_channel *chan)
713 {
714 struct wireless_dev *wdev;
715 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
716
717 ASSERT_RTNL();
718
719 if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) ||
720 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR))
721 return false;
722
723 /* only valid for GO and TDLS off-channel (station/p2p-CL) */
724 if (iftype != NL80211_IFTYPE_P2P_GO &&
725 iftype != NL80211_IFTYPE_STATION &&
726 iftype != NL80211_IFTYPE_P2P_CLIENT)
727 return false;
728
729 if (regulatory_indoor_allowed() &&
730 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
731 return true;
732
733 if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT))
734 return false;
735
736 /*
737 * Generally, it is possible to rely on another device/driver to allow
738 * the IR concurrent relaxation, however, since the device can further
739 * enforce the relaxation (by doing a similar verifications as this),
740 * and thus fail the GO instantiation, consider only the interfaces of
741 * the current registered device.
742 */
743 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
744 struct ieee80211_channel *other_chan = NULL;
745 int r1, r2;
746
747 wdev_lock(wdev);
748 if (wdev->iftype == NL80211_IFTYPE_STATION &&
749 wdev->current_bss)
750 other_chan = wdev->current_bss->pub.channel;
751
752 /*
753 * If a GO already operates on the same GO_CONCURRENT channel,
754 * this one (maybe the same one) can beacon as well. We allow
755 * the operation even if the station we relied on with
756 * GO_CONCURRENT is disconnected now. But then we must make sure
757 * we're not outdoor on an indoor-only channel.
758 */
759 if (iftype == NL80211_IFTYPE_P2P_GO &&
760 wdev->iftype == NL80211_IFTYPE_P2P_GO &&
761 wdev->beacon_interval &&
762 !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
763 other_chan = wdev->chandef.chan;
764 wdev_unlock(wdev);
765
766 if (!other_chan)
767 continue;
768
769 if (chan == other_chan)
770 return true;
771
772 if (chan->band != NL80211_BAND_5GHZ)
773 continue;
774
775 r1 = cfg80211_get_unii(chan->center_freq);
776 r2 = cfg80211_get_unii(other_chan->center_freq);
777
778 if (r1 != -EINVAL && r1 == r2) {
779 /*
780 * At some locations channels 149-165 are considered a
781 * bundle, but at other locations, e.g., Indonesia,
782 * channels 149-161 are considered a bundle while
783 * channel 165 is left out and considered to be in a
784 * different bundle. Thus, in case that there is a
785 * station interface connected to an AP on channel 165,
786 * it is assumed that channels 149-161 are allowed for
787 * GO operations. However, having a station interface
788 * connected to an AP on channels 149-161, does not
789 * allow GO operation on channel 165.
790 */
791 if (chan->center_freq == 5825 &&
792 other_chan->center_freq != 5825)
793 continue;
794 return true;
795 }
796 }
797
798 return false;
799 }
800
801 static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy,
802 struct cfg80211_chan_def *chandef,
803 enum nl80211_iftype iftype,
804 bool check_no_ir)
805 {
806 bool res;
807 u32 prohibited_flags = IEEE80211_CHAN_DISABLED |
808 IEEE80211_CHAN_RADAR;
809
810 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
811
812 if (check_no_ir)
813 prohibited_flags |= IEEE80211_CHAN_NO_IR;
814
815 if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 &&
816 cfg80211_chandef_dfs_available(wiphy, chandef)) {
817 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */
818 prohibited_flags = IEEE80211_CHAN_DISABLED;
819 }
820
821 res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags);
822
823 trace_cfg80211_return_bool(res);
824 return res;
825 }
826
827 bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
828 struct cfg80211_chan_def *chandef,
829 enum nl80211_iftype iftype)
830 {
831 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true);
832 }
833 EXPORT_SYMBOL(cfg80211_reg_can_beacon);
834
835 bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy,
836 struct cfg80211_chan_def *chandef,
837 enum nl80211_iftype iftype)
838 {
839 bool check_no_ir;
840
841 ASSERT_RTNL();
842
843 /*
844 * Under certain conditions suggested by some regulatory bodies a
845 * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag
846 * only if such relaxations are not enabled and the conditions are not
847 * met.
848 */
849 check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype,
850 chandef->chan);
851
852 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
853 }
854 EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax);
855
856 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
857 struct cfg80211_chan_def *chandef)
858 {
859 if (!rdev->ops->set_monitor_channel)
860 return -EOPNOTSUPP;
861 if (!cfg80211_has_monitors_only(rdev))
862 return -EBUSY;
863
864 return rdev_set_monitor_channel(rdev, chandef);
865 }
866
867 void
868 cfg80211_get_chan_state(struct wireless_dev *wdev,
869 struct ieee80211_channel **chan,
870 enum cfg80211_chan_mode *chanmode,
871 u8 *radar_detect)
872 {
873 int ret;
874
875 *chan = NULL;
876 *chanmode = CHAN_MODE_UNDEFINED;
877
878 ASSERT_WDEV_LOCK(wdev);
879
880 if (wdev->netdev && !netif_running(wdev->netdev))
881 return;
882
883 switch (wdev->iftype) {
884 case NL80211_IFTYPE_ADHOC:
885 if (wdev->current_bss) {
886 *chan = wdev->current_bss->pub.channel;
887 *chanmode = (wdev->ibss_fixed &&
888 !wdev->ibss_dfs_possible)
889 ? CHAN_MODE_SHARED
890 : CHAN_MODE_EXCLUSIVE;
891
892 /* consider worst-case - IBSS can try to return to the
893 * original user-specified channel as creator */
894 if (wdev->ibss_dfs_possible)
895 *radar_detect |= BIT(wdev->chandef.width);
896 return;
897 }
898 break;
899 case NL80211_IFTYPE_STATION:
900 case NL80211_IFTYPE_P2P_CLIENT:
901 if (wdev->current_bss) {
902 *chan = wdev->current_bss->pub.channel;
903 *chanmode = CHAN_MODE_SHARED;
904 return;
905 }
906 break;
907 case NL80211_IFTYPE_AP:
908 case NL80211_IFTYPE_P2P_GO:
909 if (wdev->cac_started) {
910 *chan = wdev->chandef.chan;
911 *chanmode = CHAN_MODE_SHARED;
912 *radar_detect |= BIT(wdev->chandef.width);
913 } else if (wdev->beacon_interval) {
914 *chan = wdev->chandef.chan;
915 *chanmode = CHAN_MODE_SHARED;
916
917 ret = cfg80211_chandef_dfs_required(wdev->wiphy,
918 &wdev->chandef,
919 wdev->iftype);
920 WARN_ON(ret < 0);
921 if (ret > 0)
922 *radar_detect |= BIT(wdev->chandef.width);
923 }
924 return;
925 case NL80211_IFTYPE_MESH_POINT:
926 if (wdev->mesh_id_len) {
927 *chan = wdev->chandef.chan;
928 *chanmode = CHAN_MODE_SHARED;
929
930 ret = cfg80211_chandef_dfs_required(wdev->wiphy,
931 &wdev->chandef,
932 wdev->iftype);
933 WARN_ON(ret < 0);
934 if (ret > 0)
935 *radar_detect |= BIT(wdev->chandef.width);
936 }
937 return;
938 case NL80211_IFTYPE_OCB:
939 if (wdev->chandef.chan) {
940 *chan = wdev->chandef.chan;
941 *chanmode = CHAN_MODE_SHARED;
942 return;
943 }
944 break;
945 case NL80211_IFTYPE_MONITOR:
946 case NL80211_IFTYPE_AP_VLAN:
947 case NL80211_IFTYPE_WDS:
948 case NL80211_IFTYPE_P2P_DEVICE:
949 /* these interface types don't really have a channel */
950 return;
951 case NL80211_IFTYPE_UNSPECIFIED:
952 case NUM_NL80211_IFTYPES:
953 WARN_ON(1);
954 }
955 }
Linux with added FPC-III support