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Merge branches 'pm-cpufreq-fixes' and 'pm-cpuidle-fixes'
[linux/fpc-iii.git] / net / wireless / chan.c
blob5497d022fadabf17512c0f4c0b77ce50cce345dc
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 case NL80211_IFTYPE_NAN:
376 break;
377 case NL80211_IFTYPE_UNSPECIFIED:
378 case NUM_NL80211_IFTYPES:
379 WARN_ON(1);
380 }
381
382 return 0;
383 }
384 EXPORT_SYMBOL(cfg80211_chandef_dfs_required);
385
386 static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy,
387 u32 center_freq,
388 u32 bandwidth)
389 {
390 struct ieee80211_channel *c;
391 u32 freq, start_freq, end_freq;
392 int count = 0;
393
394 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
395 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
396
397 /*
398 * Check entire range of channels for the bandwidth.
399 * Check all channels are DFS channels (DFS_USABLE or
400 * DFS_AVAILABLE). Return number of usable channels
401 * (require CAC). Allow DFS and non-DFS channel mix.
402 */
403 for (freq = start_freq; freq <= end_freq; freq += 20) {
404 c = ieee80211_get_channel(wiphy, freq);
405 if (!c)
406 return -EINVAL;
407
408 if (c->flags & IEEE80211_CHAN_DISABLED)
409 return -EINVAL;
410
411 if (c->flags & IEEE80211_CHAN_RADAR) {
412 if (c->dfs_state == NL80211_DFS_UNAVAILABLE)
413 return -EINVAL;
414
415 if (c->dfs_state == NL80211_DFS_USABLE)
416 count++;
417 }
418 }
419
420 return count;
421 }
422
423 bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
424 const struct cfg80211_chan_def *chandef)
425 {
426 int width;
427 int r1, r2 = 0;
428
429 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
430 return false;
431
432 width = cfg80211_chandef_get_width(chandef);
433 if (width < 0)
434 return false;
435
436 r1 = cfg80211_get_chans_dfs_usable(wiphy, chandef->center_freq1,
437 width);
438
439 if (r1 < 0)
440 return false;
441
442 switch (chandef->width) {
443 case NL80211_CHAN_WIDTH_80P80:
444 WARN_ON(!chandef->center_freq2);
445 r2 = cfg80211_get_chans_dfs_usable(wiphy,
446 chandef->center_freq2,
447 width);
448 if (r2 < 0)
449 return false;
450 break;
451 default:
452 WARN_ON(chandef->center_freq2);
453 break;
454 }
455
456 return (r1 + r2 > 0);
457 }
458
459
460 static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy,
461 u32 center_freq,
462 u32 bandwidth)
463 {
464 struct ieee80211_channel *c;
465 u32 freq, start_freq, end_freq;
466
467 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
468 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
469
470 /*
471 * Check entire range of channels for the bandwidth.
472 * If any channel in between is disabled or has not
473 * had gone through CAC return false
474 */
475 for (freq = start_freq; freq <= end_freq; freq += 20) {
476 c = ieee80211_get_channel(wiphy, freq);
477 if (!c)
478 return false;
479
480 if (c->flags & IEEE80211_CHAN_DISABLED)
481 return false;
482
483 if ((c->flags & IEEE80211_CHAN_RADAR) &&
484 (c->dfs_state != NL80211_DFS_AVAILABLE))
485 return false;
486 }
487
488 return true;
489 }
490
491 static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy,
492 const struct cfg80211_chan_def *chandef)
493 {
494 int width;
495 int r;
496
497 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
498 return false;
499
500 width = cfg80211_chandef_get_width(chandef);
501 if (width < 0)
502 return false;
503
504 r = cfg80211_get_chans_dfs_available(wiphy, chandef->center_freq1,
505 width);
506
507 /* If any of channels unavailable for cf1 just return */
508 if (!r)
509 return r;
510
511 switch (chandef->width) {
512 case NL80211_CHAN_WIDTH_80P80:
513 WARN_ON(!chandef->center_freq2);
514 r = cfg80211_get_chans_dfs_available(wiphy,
515 chandef->center_freq2,
516 width);
517 break;
518 default:
519 WARN_ON(chandef->center_freq2);
520 break;
521 }
522
523 return r;
524 }
525
526 static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy,
527 u32 center_freq,
528 u32 bandwidth)
529 {
530 struct ieee80211_channel *c;
531 u32 start_freq, end_freq, freq;
532 unsigned int dfs_cac_ms = 0;
533
534 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
535 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
536
537 for (freq = start_freq; freq <= end_freq; freq += 20) {
538 c = ieee80211_get_channel(wiphy, freq);
539 if (!c)
540 return 0;
541
542 if (c->flags & IEEE80211_CHAN_DISABLED)
543 return 0;
544
545 if (!(c->flags & IEEE80211_CHAN_RADAR))
546 continue;
547
548 if (c->dfs_cac_ms > dfs_cac_ms)
549 dfs_cac_ms = c->dfs_cac_ms;
550 }
551
552 return dfs_cac_ms;
553 }
554
555 unsigned int
556 cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
557 const struct cfg80211_chan_def *chandef)
558 {
559 int width;
560 unsigned int t1 = 0, t2 = 0;
561
562 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
563 return 0;
564
565 width = cfg80211_chandef_get_width(chandef);
566 if (width < 0)
567 return 0;
568
569 t1 = cfg80211_get_chans_dfs_cac_time(wiphy,
570 chandef->center_freq1,
571 width);
572
573 if (!chandef->center_freq2)
574 return t1;
575
576 t2 = cfg80211_get_chans_dfs_cac_time(wiphy,
577 chandef->center_freq2,
578 width);
579
580 return max(t1, t2);
581 }
582
583 static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
584 u32 center_freq, u32 bandwidth,
585 u32 prohibited_flags)
586 {
587 struct ieee80211_channel *c;
588 u32 freq, start_freq, end_freq;
589
590 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
591 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
592
593 for (freq = start_freq; freq <= end_freq; freq += 20) {
594 c = ieee80211_get_channel(wiphy, freq);
595 if (!c || c->flags & prohibited_flags)
596 return false;
597 }
598
599 return true;
600 }
601
602 bool cfg80211_chandef_usable(struct wiphy *wiphy,
603 const struct cfg80211_chan_def *chandef,
604 u32 prohibited_flags)
605 {
606 struct ieee80211_sta_ht_cap *ht_cap;
607 struct ieee80211_sta_vht_cap *vht_cap;
608 u32 width, control_freq, cap;
609
610 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
611 return false;
612
613 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap;
614 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap;
615
616 control_freq = chandef->chan->center_freq;
617
618 switch (chandef->width) {
619 case NL80211_CHAN_WIDTH_5:
620 width = 5;
621 break;
622 case NL80211_CHAN_WIDTH_10:
623 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ;
624 width = 10;
625 break;
626 case NL80211_CHAN_WIDTH_20:
627 if (!ht_cap->ht_supported)
628 return false;
629 case NL80211_CHAN_WIDTH_20_NOHT:
630 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ;
631 width = 20;
632 break;
633 case NL80211_CHAN_WIDTH_40:
634 width = 40;
635 if (!ht_cap->ht_supported)
636 return false;
637 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
638 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
639 return false;
640 if (chandef->center_freq1 < control_freq &&
641 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
642 return false;
643 if (chandef->center_freq1 > control_freq &&
644 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
645 return false;
646 break;
647 case NL80211_CHAN_WIDTH_80P80:
648 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
649 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
650 return false;
651 case NL80211_CHAN_WIDTH_80:
652 if (!vht_cap->vht_supported)
653 return false;
654 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ;
655 width = 80;
656 break;
657 case NL80211_CHAN_WIDTH_160:
658 if (!vht_cap->vht_supported)
659 return false;
660 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
661 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
662 cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
663 return false;
664 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ;
665 width = 160;
666 break;
667 default:
668 WARN_ON_ONCE(1);
669 return false;
670 }
671
672 /*
673 * TODO: What if there are only certain 80/160/80+80 MHz channels
674 * allowed by the driver, or only certain combinations?
675 * For 40 MHz the driver can set the NO_HT40 flags, but for
676 * 80/160 MHz and in particular 80+80 MHz this isn't really
677 * feasible and we only have NO_80MHZ/NO_160MHZ so far but
678 * no way to cover 80+80 MHz or more complex restrictions.
679 * Note that such restrictions also need to be advertised to
680 * userspace, for example for P2P channel selection.
681 */
682
683 if (width > 20)
684 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
685
686 /* 5 and 10 MHz are only defined for the OFDM PHY */
687 if (width < 20)
688 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
689
690
691 if (!cfg80211_secondary_chans_ok(wiphy, chandef->center_freq1,
692 width, prohibited_flags))
693 return false;
694
695 if (!chandef->center_freq2)
696 return true;
697 return cfg80211_secondary_chans_ok(wiphy, chandef->center_freq2,
698 width, prohibited_flags);
699 }
700 EXPORT_SYMBOL(cfg80211_chandef_usable);
701
702 /*
703 * Check if the channel can be used under permissive conditions mandated by
704 * some regulatory bodies, i.e., the channel is marked with
705 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface
706 * associated to an AP on the same channel or on the same UNII band
707 * (assuming that the AP is an authorized master).
708 * In addition allow operation on a channel on which indoor operation is
709 * allowed, iff we are currently operating in an indoor environment.
710 */
711 static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy,
712 enum nl80211_iftype iftype,
713 struct ieee80211_channel *chan)
714 {
715 struct wireless_dev *wdev;
716 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
717
718 ASSERT_RTNL();
719
720 if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) ||
721 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR))
722 return false;
723
724 /* only valid for GO and TDLS off-channel (station/p2p-CL) */
725 if (iftype != NL80211_IFTYPE_P2P_GO &&
726 iftype != NL80211_IFTYPE_STATION &&
727 iftype != NL80211_IFTYPE_P2P_CLIENT)
728 return false;
729
730 if (regulatory_indoor_allowed() &&
731 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
732 return true;
733
734 if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT))
735 return false;
736
737 /*
738 * Generally, it is possible to rely on another device/driver to allow
739 * the IR concurrent relaxation, however, since the device can further
740 * enforce the relaxation (by doing a similar verifications as this),
741 * and thus fail the GO instantiation, consider only the interfaces of
742 * the current registered device.
743 */
744 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
745 struct ieee80211_channel *other_chan = NULL;
746 int r1, r2;
747
748 wdev_lock(wdev);
749 if (wdev->iftype == NL80211_IFTYPE_STATION &&
750 wdev->current_bss)
751 other_chan = wdev->current_bss->pub.channel;
752
753 /*
754 * If a GO already operates on the same GO_CONCURRENT channel,
755 * this one (maybe the same one) can beacon as well. We allow
756 * the operation even if the station we relied on with
757 * GO_CONCURRENT is disconnected now. But then we must make sure
758 * we're not outdoor on an indoor-only channel.
759 */
760 if (iftype == NL80211_IFTYPE_P2P_GO &&
761 wdev->iftype == NL80211_IFTYPE_P2P_GO &&
762 wdev->beacon_interval &&
763 !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
764 other_chan = wdev->chandef.chan;
765 wdev_unlock(wdev);
766
767 if (!other_chan)
768 continue;
769
770 if (chan == other_chan)
771 return true;
772
773 if (chan->band != NL80211_BAND_5GHZ)
774 continue;
775
776 r1 = cfg80211_get_unii(chan->center_freq);
777 r2 = cfg80211_get_unii(other_chan->center_freq);
778
779 if (r1 != -EINVAL && r1 == r2) {
780 /*
781 * At some locations channels 149-165 are considered a
782 * bundle, but at other locations, e.g., Indonesia,
783 * channels 149-161 are considered a bundle while
784 * channel 165 is left out and considered to be in a
785 * different bundle. Thus, in case that there is a
786 * station interface connected to an AP on channel 165,
787 * it is assumed that channels 149-161 are allowed for
788 * GO operations. However, having a station interface
789 * connected to an AP on channels 149-161, does not
790 * allow GO operation on channel 165.
791 */
792 if (chan->center_freq == 5825 &&
793 other_chan->center_freq != 5825)
794 continue;
795 return true;
796 }
797 }
798
799 return false;
800 }
801
802 static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy,
803 struct cfg80211_chan_def *chandef,
804 enum nl80211_iftype iftype,
805 bool check_no_ir)
806 {
807 bool res;
808 u32 prohibited_flags = IEEE80211_CHAN_DISABLED |
809 IEEE80211_CHAN_RADAR;
810
811 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
812
813 if (check_no_ir)
814 prohibited_flags |= IEEE80211_CHAN_NO_IR;
815
816 if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 &&
817 cfg80211_chandef_dfs_available(wiphy, chandef)) {
818 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */
819 prohibited_flags = IEEE80211_CHAN_DISABLED;
820 }
821
822 res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags);
823
824 trace_cfg80211_return_bool(res);
825 return res;
826 }
827
828 bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
829 struct cfg80211_chan_def *chandef,
830 enum nl80211_iftype iftype)
831 {
832 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true);
833 }
834 EXPORT_SYMBOL(cfg80211_reg_can_beacon);
835
836 bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy,
837 struct cfg80211_chan_def *chandef,
838 enum nl80211_iftype iftype)
839 {
840 bool check_no_ir;
841
842 ASSERT_RTNL();
843
844 /*
845 * Under certain conditions suggested by some regulatory bodies a
846 * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag
847 * only if such relaxations are not enabled and the conditions are not
848 * met.
849 */
850 check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype,
851 chandef->chan);
852
853 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
854 }
855 EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax);
856
857 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
858 struct cfg80211_chan_def *chandef)
859 {
860 if (!rdev->ops->set_monitor_channel)
861 return -EOPNOTSUPP;
862 if (!cfg80211_has_monitors_only(rdev))
863 return -EBUSY;
864
865 return rdev_set_monitor_channel(rdev, chandef);
866 }
867
868 void
869 cfg80211_get_chan_state(struct wireless_dev *wdev,
870 struct ieee80211_channel **chan,
871 enum cfg80211_chan_mode *chanmode,
872 u8 *radar_detect)
873 {
874 int ret;
875
876 *chan = NULL;
877 *chanmode = CHAN_MODE_UNDEFINED;
878
879 ASSERT_WDEV_LOCK(wdev);
880
881 if (wdev->netdev && !netif_running(wdev->netdev))
882 return;
883
884 switch (wdev->iftype) {
885 case NL80211_IFTYPE_ADHOC:
886 if (wdev->current_bss) {
887 *chan = wdev->current_bss->pub.channel;
888 *chanmode = (wdev->ibss_fixed &&
889 !wdev->ibss_dfs_possible)
890 ? CHAN_MODE_SHARED
891 : CHAN_MODE_EXCLUSIVE;
892
893 /* consider worst-case - IBSS can try to return to the
894 * original user-specified channel as creator */
895 if (wdev->ibss_dfs_possible)
896 *radar_detect |= BIT(wdev->chandef.width);
897 return;
898 }
899 break;
900 case NL80211_IFTYPE_STATION:
901 case NL80211_IFTYPE_P2P_CLIENT:
902 if (wdev->current_bss) {
903 *chan = wdev->current_bss->pub.channel;
904 *chanmode = CHAN_MODE_SHARED;
905 return;
906 }
907 break;
908 case NL80211_IFTYPE_AP:
909 case NL80211_IFTYPE_P2P_GO:
910 if (wdev->cac_started) {
911 *chan = wdev->chandef.chan;
912 *chanmode = CHAN_MODE_SHARED;
913 *radar_detect |= BIT(wdev->chandef.width);
914 } else if (wdev->beacon_interval) {
915 *chan = wdev->chandef.chan;
916 *chanmode = CHAN_MODE_SHARED;
917
918 ret = cfg80211_chandef_dfs_required(wdev->wiphy,
919 &wdev->chandef,
920 wdev->iftype);
921 WARN_ON(ret < 0);
922 if (ret > 0)
923 *radar_detect |= BIT(wdev->chandef.width);
924 }
925 return;
926 case NL80211_IFTYPE_MESH_POINT:
927 if (wdev->mesh_id_len) {
928 *chan = wdev->chandef.chan;
929 *chanmode = CHAN_MODE_SHARED;
930
931 ret = cfg80211_chandef_dfs_required(wdev->wiphy,
932 &wdev->chandef,
933 wdev->iftype);
934 WARN_ON(ret < 0);
935 if (ret > 0)
936 *radar_detect |= BIT(wdev->chandef.width);
937 }
938 return;
939 case NL80211_IFTYPE_OCB:
940 if (wdev->chandef.chan) {
941 *chan = wdev->chandef.chan;
942 *chanmode = CHAN_MODE_SHARED;
943 return;
944 }
945 break;
946 case NL80211_IFTYPE_MONITOR:
947 case NL80211_IFTYPE_AP_VLAN:
948 case NL80211_IFTYPE_WDS:
949 case NL80211_IFTYPE_P2P_DEVICE:
950 case NL80211_IFTYPE_NAN:
951 /* these interface types don't really have a channel */
952 return;
953 case NL80211_IFTYPE_UNSPECIFIED:
954 case NUM_NL80211_IFTYPES:
955 WARN_ON(1);
956 }
957 }
Linux with added FPC-III support