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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / net / wireless / chan.c
blob59cabc9bce693f5f39f1d2db8f436a18ac2efcaa
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 default:
517 WARN_ON(chandef->center_freq2);
518 break;
519 }
520
521 return r;
522 }
523
524 static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy,
525 u32 center_freq,
526 u32 bandwidth)
527 {
528 struct ieee80211_channel *c;
529 u32 start_freq, end_freq, freq;
530 unsigned int dfs_cac_ms = 0;
531
532 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
533 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
534
535 for (freq = start_freq; freq <= end_freq; freq += 20) {
536 c = ieee80211_get_channel(wiphy, freq);
537 if (!c)
538 return 0;
539
540 if (c->flags & IEEE80211_CHAN_DISABLED)
541 return 0;
542
543 if (!(c->flags & IEEE80211_CHAN_RADAR))
544 continue;
545
546 if (c->dfs_cac_ms > dfs_cac_ms)
547 dfs_cac_ms = c->dfs_cac_ms;
548 }
549
550 return dfs_cac_ms;
551 }
552
553 unsigned int
554 cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
555 const struct cfg80211_chan_def *chandef)
556 {
557 int width;
558 unsigned int t1 = 0, t2 = 0;
559
560 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
561 return 0;
562
563 width = cfg80211_chandef_get_width(chandef);
564 if (width < 0)
565 return 0;
566
567 t1 = cfg80211_get_chans_dfs_cac_time(wiphy,
568 chandef->center_freq1,
569 width);
570
571 if (!chandef->center_freq2)
572 return t1;
573
574 t2 = cfg80211_get_chans_dfs_cac_time(wiphy,
575 chandef->center_freq2,
576 width);
577
578 return max(t1, t2);
579 }
580
581 static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
582 u32 center_freq, u32 bandwidth,
583 u32 prohibited_flags)
584 {
585 struct ieee80211_channel *c;
586 u32 freq, start_freq, end_freq;
587
588 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
589 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
590
591 for (freq = start_freq; freq <= end_freq; freq += 20) {
592 c = ieee80211_get_channel(wiphy, freq);
593 if (!c || c->flags & prohibited_flags)
594 return false;
595 }
596
597 return true;
598 }
599
600 bool cfg80211_chandef_usable(struct wiphy *wiphy,
601 const struct cfg80211_chan_def *chandef,
602 u32 prohibited_flags)
603 {
604 struct ieee80211_sta_ht_cap *ht_cap;
605 struct ieee80211_sta_vht_cap *vht_cap;
606 u32 width, control_freq, cap;
607
608 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
609 return false;
610
611 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap;
612 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap;
613
614 control_freq = chandef->chan->center_freq;
615
616 switch (chandef->width) {
617 case NL80211_CHAN_WIDTH_5:
618 width = 5;
619 break;
620 case NL80211_CHAN_WIDTH_10:
621 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ;
622 width = 10;
623 break;
624 case NL80211_CHAN_WIDTH_20:
625 if (!ht_cap->ht_supported)
626 return false;
627 case NL80211_CHAN_WIDTH_20_NOHT:
628 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ;
629 width = 20;
630 break;
631 case NL80211_CHAN_WIDTH_40:
632 width = 40;
633 if (!ht_cap->ht_supported)
634 return false;
635 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
636 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
637 return false;
638 if (chandef->center_freq1 < control_freq &&
639 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
640 return false;
641 if (chandef->center_freq1 > control_freq &&
642 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
643 return false;
644 break;
645 case NL80211_CHAN_WIDTH_80P80:
646 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
647 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
648 return false;
649 case NL80211_CHAN_WIDTH_80:
650 if (!vht_cap->vht_supported)
651 return false;
652 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ;
653 width = 80;
654 break;
655 case NL80211_CHAN_WIDTH_160:
656 if (!vht_cap->vht_supported)
657 return false;
658 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
659 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
660 cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
661 return false;
662 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ;
663 width = 160;
664 break;
665 default:
666 WARN_ON_ONCE(1);
667 return false;
668 }
669
670 /*
671 * TODO: What if there are only certain 80/160/80+80 MHz channels
672 * allowed by the driver, or only certain combinations?
673 * For 40 MHz the driver can set the NO_HT40 flags, but for
674 * 80/160 MHz and in particular 80+80 MHz this isn't really
675 * feasible and we only have NO_80MHZ/NO_160MHZ so far but
676 * no way to cover 80+80 MHz or more complex restrictions.
677 * Note that such restrictions also need to be advertised to
678 * userspace, for example for P2P channel selection.
679 */
680
681 if (width > 20)
682 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
683
684 /* 5 and 10 MHz are only defined for the OFDM PHY */
685 if (width < 20)
686 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
687
688
689 if (!cfg80211_secondary_chans_ok(wiphy, chandef->center_freq1,
690 width, prohibited_flags))
691 return false;
692
693 if (!chandef->center_freq2)
694 return true;
695 return cfg80211_secondary_chans_ok(wiphy, chandef->center_freq2,
696 width, prohibited_flags);
697 }
698 EXPORT_SYMBOL(cfg80211_chandef_usable);
699
700 /*
701 * Check if the channel can be used under permissive conditions mandated by
702 * some regulatory bodies, i.e., the channel is marked with
703 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface
704 * associated to an AP on the same channel or on the same UNII band
705 * (assuming that the AP is an authorized master).
706 * In addition allow operation on a channel on which indoor operation is
707 * allowed, iff we are currently operating in an indoor environment.
708 */
709 static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy,
710 enum nl80211_iftype iftype,
711 struct ieee80211_channel *chan)
712 {
713 struct wireless_dev *wdev;
714 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
715
716 ASSERT_RTNL();
717
718 if (!config_enabled(CONFIG_CFG80211_REG_RELAX_NO_IR) ||
719 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR))
720 return false;
721
722 /* only valid for GO and TDLS off-channel (station/p2p-CL) */
723 if (iftype != NL80211_IFTYPE_P2P_GO &&
724 iftype != NL80211_IFTYPE_STATION &&
725 iftype != NL80211_IFTYPE_P2P_CLIENT)
726 return false;
727
728 if (regulatory_indoor_allowed() &&
729 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
730 return true;
731
732 if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT))
733 return false;
734
735 /*
736 * Generally, it is possible to rely on another device/driver to allow
737 * the IR concurrent relaxation, however, since the device can further
738 * enforce the relaxation (by doing a similar verifications as this),
739 * and thus fail the GO instantiation, consider only the interfaces of
740 * the current registered device.
741 */
742 list_for_each_entry(wdev, &rdev->wdev_list, list) {
743 struct ieee80211_channel *other_chan = NULL;
744 int r1, r2;
745
746 wdev_lock(wdev);
747 if (wdev->iftype == NL80211_IFTYPE_STATION &&
748 wdev->current_bss)
749 other_chan = wdev->current_bss->pub.channel;
750
751 /*
752 * If a GO already operates on the same GO_CONCURRENT channel,
753 * this one (maybe the same one) can beacon as well. We allow
754 * the operation even if the station we relied on with
755 * GO_CONCURRENT is disconnected now. But then we must make sure
756 * we're not outdoor on an indoor-only channel.
757 */
758 if (iftype == NL80211_IFTYPE_P2P_GO &&
759 wdev->iftype == NL80211_IFTYPE_P2P_GO &&
760 wdev->beacon_interval &&
761 !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
762 other_chan = wdev->chandef.chan;
763 wdev_unlock(wdev);
764
765 if (!other_chan)
766 continue;
767
768 if (chan == other_chan)
769 return true;
770
771 if (chan->band != IEEE80211_BAND_5GHZ)
772 continue;
773
774 r1 = cfg80211_get_unii(chan->center_freq);
775 r2 = cfg80211_get_unii(other_chan->center_freq);
776
777 if (r1 != -EINVAL && r1 == r2) {
778 /*
779 * At some locations channels 149-165 are considered a
780 * bundle, but at other locations, e.g., Indonesia,
781 * channels 149-161 are considered a bundle while
782 * channel 165 is left out and considered to be in a
783 * different bundle. Thus, in case that there is a
784 * station interface connected to an AP on channel 165,
785 * it is assumed that channels 149-161 are allowed for
786 * GO operations. However, having a station interface
787 * connected to an AP on channels 149-161, does not
788 * allow GO operation on channel 165.
789 */
790 if (chan->center_freq == 5825 &&
791 other_chan->center_freq != 5825)
792 continue;
793 return true;
794 }
795 }
796
797 return false;
798 }
799
800 static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy,
801 struct cfg80211_chan_def *chandef,
802 enum nl80211_iftype iftype,
803 bool check_no_ir)
804 {
805 bool res;
806 u32 prohibited_flags = IEEE80211_CHAN_DISABLED |
807 IEEE80211_CHAN_RADAR;
808
809 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
810
811 if (check_no_ir)
812 prohibited_flags |= IEEE80211_CHAN_NO_IR;
813
814 if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 &&
815 cfg80211_chandef_dfs_available(wiphy, chandef)) {
816 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */
817 prohibited_flags = IEEE80211_CHAN_DISABLED;
818 }
819
820 res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags);
821
822 trace_cfg80211_return_bool(res);
823 return res;
824 }
825
826 bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
827 struct cfg80211_chan_def *chandef,
828 enum nl80211_iftype iftype)
829 {
830 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true);
831 }
832 EXPORT_SYMBOL(cfg80211_reg_can_beacon);
833
834 bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy,
835 struct cfg80211_chan_def *chandef,
836 enum nl80211_iftype iftype)
837 {
838 bool check_no_ir;
839
840 ASSERT_RTNL();
841
842 /*
843 * Under certain conditions suggested by some regulatory bodies a
844 * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag
845 * only if such relaxations are not enabled and the conditions are not
846 * met.
847 */
848 check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype,
849 chandef->chan);
850
851 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
852 }
853 EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax);
854
855 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
856 struct cfg80211_chan_def *chandef)
857 {
858 if (!rdev->ops->set_monitor_channel)
859 return -EOPNOTSUPP;
860 if (!cfg80211_has_monitors_only(rdev))
861 return -EBUSY;
862
863 return rdev_set_monitor_channel(rdev, chandef);
864 }
865
866 void
867 cfg80211_get_chan_state(struct wireless_dev *wdev,
868 struct ieee80211_channel **chan,
869 enum cfg80211_chan_mode *chanmode,
870 u8 *radar_detect)
871 {
872 int ret;
873
874 *chan = NULL;
875 *chanmode = CHAN_MODE_UNDEFINED;
876
877 ASSERT_WDEV_LOCK(wdev);
878
879 if (wdev->netdev && !netif_running(wdev->netdev))
880 return;
881
882 switch (wdev->iftype) {
883 case NL80211_IFTYPE_ADHOC:
884 if (wdev->current_bss) {
885 *chan = wdev->current_bss->pub.channel;
886 *chanmode = (wdev->ibss_fixed &&
887 !wdev->ibss_dfs_possible)
888 ? CHAN_MODE_SHARED
889 : CHAN_MODE_EXCLUSIVE;
890
891 /* consider worst-case - IBSS can try to return to the
892 * original user-specified channel as creator */
893 if (wdev->ibss_dfs_possible)
894 *radar_detect |= BIT(wdev->chandef.width);
895 return;
896 }
897 break;
898 case NL80211_IFTYPE_STATION:
899 case NL80211_IFTYPE_P2P_CLIENT:
900 if (wdev->current_bss) {
901 *chan = wdev->current_bss->pub.channel;
902 *chanmode = CHAN_MODE_SHARED;
903 return;
904 }
905 break;
906 case NL80211_IFTYPE_AP:
907 case NL80211_IFTYPE_P2P_GO:
908 if (wdev->cac_started) {
909 *chan = wdev->chandef.chan;
910 *chanmode = CHAN_MODE_SHARED;
911 *radar_detect |= BIT(wdev->chandef.width);
912 } else if (wdev->beacon_interval) {
913 *chan = wdev->chandef.chan;
914 *chanmode = CHAN_MODE_SHARED;
915
916 ret = cfg80211_chandef_dfs_required(wdev->wiphy,
917 &wdev->chandef,
918 wdev->iftype);
919 WARN_ON(ret < 0);
920 if (ret > 0)
921 *radar_detect |= BIT(wdev->chandef.width);
922 }
923 return;
924 case NL80211_IFTYPE_MESH_POINT:
925 if (wdev->mesh_id_len) {
926 *chan = wdev->chandef.chan;
927 *chanmode = CHAN_MODE_SHARED;
928
929 ret = cfg80211_chandef_dfs_required(wdev->wiphy,
930 &wdev->chandef,
931 wdev->iftype);
932 WARN_ON(ret < 0);
933 if (ret > 0)
934 *radar_detect |= BIT(wdev->chandef.width);
935 }
936 return;
937 case NL80211_IFTYPE_OCB:
938 if (wdev->chandef.chan) {
939 *chan = wdev->chandef.chan;
940 *chanmode = CHAN_MODE_SHARED;
941 return;
942 }
943 break;
944 case NL80211_IFTYPE_MONITOR:
945 case NL80211_IFTYPE_AP_VLAN:
946 case NL80211_IFTYPE_WDS:
947 case NL80211_IFTYPE_P2P_DEVICE:
948 /* these interface types don't really have a channel */
949 return;
950 case NL80211_IFTYPE_UNSPECIFIED:
951 case NUM_NL80211_IFTYPES:
952 WARN_ON(1);
953 }
954 }
Linux with added FPC-III support