summaryrefslogtreecommitdiff
path: root/net/wireless/chan.c
blob: 8f39e33e71bbc301d2fdae11f5ccb390f4f59048 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
/*
 * This file contains helper code to handle channel
 * settings and keeping track of what is possible at
 * any point in time.
 *
 * Copyright 2009	Johannes Berg <johannes@sipsolutions.net>
 * Copyright 2013-2014  Intel Mobile Communications GmbH
 */

#include <linux/export.h>
#include <net/cfg80211.h>
#include "core.h"
#include "rdev-ops.h"

void cfg80211_chandef_create(struct cfg80211_chan_def *chandef,
			     struct ieee80211_channel *chan,
			     enum nl80211_channel_type chan_type)
{
	if (WARN_ON(!chan))
		return;

	chandef->chan = chan;
	chandef->center_freq2 = 0;

	switch (chan_type) {
	case NL80211_CHAN_NO_HT:
		chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
		chandef->center_freq1 = chan->center_freq;
		break;
	case NL80211_CHAN_HT20:
		chandef->width = NL80211_CHAN_WIDTH_20;
		chandef->center_freq1 = chan->center_freq;
		break;
	case NL80211_CHAN_HT40PLUS:
		chandef->width = NL80211_CHAN_WIDTH_40;
		chandef->center_freq1 = chan->center_freq + 10;
		break;
	case NL80211_CHAN_HT40MINUS:
		chandef->width = NL80211_CHAN_WIDTH_40;
		chandef->center_freq1 = chan->center_freq - 10;
		break;
	default:
		WARN_ON(1);
	}
}
EXPORT_SYMBOL(cfg80211_chandef_create);

bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef)
{
	u32 control_freq;

	if (!chandef->chan)
		return false;

	control_freq = chandef->chan->center_freq;

	switch (chandef->width) {
	case NL80211_CHAN_WIDTH_5:
	case NL80211_CHAN_WIDTH_10:
	case NL80211_CHAN_WIDTH_20:
	case NL80211_CHAN_WIDTH_20_NOHT:
		if (chandef->center_freq1 != control_freq)
			return false;
		if (chandef->center_freq2)
			return false;
		break;
	case NL80211_CHAN_WIDTH_40:
		if (chandef->center_freq1 != control_freq + 10 &&
		    chandef->center_freq1 != control_freq - 10)
			return false;
		if (chandef->center_freq2)
			return false;
		break;
	case NL80211_CHAN_WIDTH_80P80:
		if (chandef->center_freq1 != control_freq + 30 &&
		    chandef->center_freq1 != control_freq + 10 &&
		    chandef->center_freq1 != control_freq - 10 &&
		    chandef->center_freq1 != control_freq - 30)
			return false;
		if (!chandef->center_freq2)
			return false;
		/* adjacent is not allowed -- that's a 160 MHz channel */
		if (chandef->center_freq1 - chandef->center_freq2 == 80 ||
		    chandef->center_freq2 - chandef->center_freq1 == 80)
			return false;
		break;
	case NL80211_CHAN_WIDTH_80:
		if (chandef->center_freq1 != control_freq + 30 &&
		    chandef->center_freq1 != control_freq + 10 &&
		    chandef->center_freq1 != control_freq - 10 &&
		    chandef->center_freq1 != control_freq - 30)
			return false;
		if (chandef->center_freq2)
			return false;
		break;
	case NL80211_CHAN_WIDTH_160:
		if (chandef->center_freq1 != control_freq + 70 &&
		    chandef->center_freq1 != control_freq + 50 &&
		    chandef->center_freq1 != control_freq + 30 &&
		    chandef->center_freq1 != control_freq + 10 &&
		    chandef->center_freq1 != control_freq - 10 &&
		    chandef->center_freq1 != control_freq - 30 &&
		    chandef->center_freq1 != control_freq - 50 &&
		    chandef->center_freq1 != control_freq - 70)
			return false;
		if (chandef->center_freq2)
			return false;
		break;
	default:
		return false;
	}

	return true;
}
EXPORT_SYMBOL(cfg80211_chandef_valid);

static void chandef_primary_freqs(const struct cfg80211_chan_def *c,
				  u32 *pri40, u32 *pri80)
{
	int tmp;

	switch (c->width) {
	case NL80211_CHAN_WIDTH_40:
		*pri40 = c->center_freq1;
		*pri80 = 0;
		break;
	case NL80211_CHAN_WIDTH_80:
	case NL80211_CHAN_WIDTH_80P80:
		*pri80 = c->center_freq1;
		/* n_P20 */
		tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
		/* n_P40 */
		tmp /= 2;
		/* freq_P40 */
		*pri40 = c->center_freq1 - 20 + 40 * tmp;
		break;
	case NL80211_CHAN_WIDTH_160:
		/* n_P20 */
		tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
		/* n_P40 */
		tmp /= 2;
		/* freq_P40 */
		*pri40 = c->center_freq1 - 60 + 40 * tmp;
		/* n_P80 */
		tmp /= 2;
		*pri80 = c->center_freq1 - 40 + 80 * tmp;
		break;
	default:
		WARN_ON_ONCE(1);
	}
}

static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c)
{
	int width;

	switch (c->width) {
	case NL80211_CHAN_WIDTH_5:
		width = 5;
		break;
	case NL80211_CHAN_WIDTH_10:
		width = 10;
		break;
	case NL80211_CHAN_WIDTH_20:
	case NL80211_CHAN_WIDTH_20_NOHT:
		width = 20;
		break;
	case NL80211_CHAN_WIDTH_40:
		width = 40;
		break;
	case NL80211_CHAN_WIDTH_80P80:
	case NL80211_CHAN_WIDTH_80:
		width = 80;
		break;
	case NL80211_CHAN_WIDTH_160:
		width = 160;
		break;
	default:
		WARN_ON_ONCE(1);
		return -1;
	}
	return width;
}

const struct cfg80211_chan_def *
cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
			    const struct cfg80211_chan_def *c2)
{
	u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80;

	/* If they are identical, return */
	if (cfg80211_chandef_identical(c1, c2))
		return c1;

	/* otherwise, must have same control channel */
	if (c1->chan != c2->chan)
		return NULL;

	/*
	 * If they have the same width, but aren't identical,
	 * then they can't be compatible.
	 */
	if (c1->width == c2->width)
		return NULL;

	/*
	 * can't be compatible if one of them is 5 or 10 MHz,
	 * but they don't have the same width.
	 */
	if (c1->width == NL80211_CHAN_WIDTH_5 ||
	    c1->width == NL80211_CHAN_WIDTH_10 ||
	    c2->width == NL80211_CHAN_WIDTH_5 ||
	    c2->width == NL80211_CHAN_WIDTH_10)
		return NULL;

	if (c1->width == NL80211_CHAN_WIDTH_20_NOHT ||
	    c1->width == NL80211_CHAN_WIDTH_20)
		return c2;

	if (c2->width == NL80211_CHAN_WIDTH_20_NOHT ||
	    c2->width == NL80211_CHAN_WIDTH_20)
		return c1;

	chandef_primary_freqs(c1, &c1_pri40, &c1_pri80);
	chandef_primary_freqs(c2, &c2_pri40, &c2_pri80);

	if (c1_pri40 != c2_pri40)
		return NULL;

	WARN_ON(!c1_pri80 && !c2_pri80);
	if (c1_pri80 && c2_pri80 && c1_pri80 != c2_pri80)
		return NULL;

	if (c1->width > c2->width)
		return c1;
	return c2;
}
EXPORT_SYMBOL(cfg80211_chandef_compatible);

static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq,
					 u32 bandwidth,
					 enum nl80211_dfs_state dfs_state)
{
	struct ieee80211_channel *c;
	u32 freq;

	for (freq = center_freq - bandwidth/2 + 10;
	     freq <= center_freq + bandwidth/2 - 10;
	     freq += 20) {
		c = ieee80211_get_channel(wiphy, freq);
		if (!c || !(c->flags & IEEE80211_CHAN_RADAR))
			continue;

		c->dfs_state = dfs_state;
		c->dfs_state_entered = jiffies;
	}
}

void cfg80211_set_dfs_state(struct wiphy *wiphy,
			    const struct cfg80211_chan_def *chandef,
			    enum nl80211_dfs_state dfs_state)
{
	int width;

	if (WARN_ON(!cfg80211_chandef_valid(chandef)))
		return;

	width = cfg80211_chandef_get_width(chandef);
	if (width < 0)
		return;

	cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1,
				     width, dfs_state);

	if (!chandef->center_freq2)
		return;
	cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2,
				     width, dfs_state);
}

static u32 cfg80211_get_start_freq(u32 center_freq,
				   u32 bandwidth)
{
	u32 start_freq;

	if (bandwidth <= 20)
		start_freq = center_freq;
	else
		start_freq = center_freq - bandwidth/2 + 10;

	return start_freq;
}

static u32 cfg80211_get_end_freq(u32 center_freq,
				 u32 bandwidth)
{
	u32 end_freq;

	if (bandwidth <= 20)
		end_freq = center_freq;
	else
		end_freq = center_freq + bandwidth/2 - 10;

	return end_freq;
}

static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy,
					    u32 center_freq,
					    u32 bandwidth)
{
	struct ieee80211_channel *c;
	u32 freq, start_freq, end_freq;

	start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
	end_freq = cfg80211_get_end_freq(center_freq, bandwidth);

	for (freq = start_freq; freq <= end_freq; freq += 20) {
		c = ieee80211_get_channel(wiphy, freq);
		if (!c)
			return -EINVAL;

		if (c->flags & IEEE80211_CHAN_RADAR)
			return 1;
	}
	return 0;
}


int cfg80211_chandef_dfs_required(struct wiphy *wiphy,
				  const struct cfg80211_chan_def *chandef,
				  enum nl80211_iftype iftype)
{
	int width;
	int ret;

	if (WARN_ON(!cfg80211_chandef_valid(chandef)))
		return -EINVAL;

	switch (iftype) {
	case NL80211_IFTYPE_ADHOC:
	case NL80211_IFTYPE_AP:
	case NL80211_IFTYPE_P2P_GO:
	case NL80211_IFTYPE_MESH_POINT:
		width = cfg80211_chandef_get_width(chandef);
		if (width < 0)
			return -EINVAL;

		ret = cfg80211_get_chans_dfs_required(wiphy,
						      chandef->center_freq1,
						      width);
		if (ret < 0)
			return ret;
		else if (ret > 0)
			return BIT(chandef->width);

		if (!chandef->center_freq2)
			return 0;

		ret = cfg80211_get_chans_dfs_required(wiphy,
						      chandef->center_freq2,
						      width);
		if (ret < 0)
			return ret;
		else if (ret > 0)
			return BIT(chandef->width);

		break;
	case NL80211_IFTYPE_STATION:
	case NL80211_IFTYPE_P2P_CLIENT:
	case NL80211_IFTYPE_MONITOR:
	case NL80211_IFTYPE_AP_VLAN:
	case NL80211_IFTYPE_WDS:
	case NL80211_IFTYPE_P2P_DEVICE:
		break;
	case NL80211_IFTYPE_UNSPECIFIED:
	case NUM_NL80211_IFTYPES:
		WARN_ON(1);
	}

	return 0;
}
EXPORT_SYMBOL(cfg80211_chandef_dfs_required);

static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy,
					 u32 center_freq,
					 u32 bandwidth)
{
	struct ieee80211_channel *c;
	u32 freq, start_freq, end_freq;
	int count = 0;

	start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
	end_freq = cfg80211_get_end_freq(center_freq, bandwidth);

	/*
	 * Check entire range of channels for the bandwidth.
	 * Check all channels are DFS channels (DFS_USABLE or
	 * DFS_AVAILABLE). Return number of usable channels
	 * (require CAC). Allow DFS and non-DFS channel mix.
	 */
	for (freq = start_freq; freq <= end_freq; freq += 20) {
		c = ieee80211_get_channel(wiphy, freq);
		if (!c)
			return -EINVAL;

		if (c->flags & IEEE80211_CHAN_DISABLED)
			return -EINVAL;

		if (c->flags & IEEE80211_CHAN_RADAR) {
			if (c->dfs_state == NL80211_DFS_UNAVAILABLE)
				return -EINVAL;

			if (c->dfs_state == NL80211_DFS_USABLE)
				count++;
		}
	}

	return count;
}

bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
				 const struct cfg80211_chan_def *chandef)
{
	int width;
	int r1, r2 = 0;

	if (WARN_ON(!cfg80211_chandef_valid(chandef)))
		return false;

	width = cfg80211_chandef_get_width(chandef);
	if (width < 0)
		return false;

	r1 = cfg80211_get_chans_dfs_usable(wiphy, chandef->center_freq1,
					  width);

	if (r1 < 0)
		return false;

	switch (chandef->width) {
	case NL80211_CHAN_WIDTH_80P80:
		WARN_ON(!chandef->center_freq2);
		r2 = cfg80211_get_chans_dfs_usable(wiphy,
						   chandef->center_freq2,
						   width);
		if (r2 < 0)
			return false;
		break;
	default:
		WARN_ON(chandef->center_freq2);
		break;
	}

	return (r1 + r2 > 0);
}


static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy,
					     u32 center_freq,
					     u32 bandwidth)
{
	struct ieee80211_channel *c;
	u32 freq, start_freq, end_freq;

	start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
	end_freq = cfg80211_get_end_freq(center_freq, bandwidth);

	/*
	 * Check entire range of channels for the bandwidth.
	 * If any channel in between is disabled or has not
	 * had gone through CAC return false
	 */
	for (freq = start_freq; freq <= end_freq; freq += 20) {
		c = ieee80211_get_channel(wiphy, freq);
		if (!c)
			return false;

		if (c->flags & IEEE80211_CHAN_DISABLED)
			return false;

		if ((c->flags & IEEE80211_CHAN_RADAR)  &&
		    (c->dfs_state != NL80211_DFS_AVAILABLE))
			return false;
	}

	return true;
}

static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy,
				const struct cfg80211_chan_def *chandef)
{
	int width;
	int r;

	if (WARN_ON(!cfg80211_chandef_valid(chandef)))
		return false;

	width = cfg80211_chandef_get_width(chandef);
	if (width < 0)
		return false;

	r = cfg80211_get_chans_dfs_available(wiphy, chandef->center_freq1,
					     width);

	/* If any of channels unavailable for cf1 just return */
	if (!r)
		return r;

	switch (chandef->width) {
	case NL80211_CHAN_WIDTH_80P80:
		WARN_ON(!chandef->center_freq2);
		r = cfg80211_get_chans_dfs_available(wiphy,
						     chandef->center_freq2,
						     width);
	default:
		WARN_ON(chandef->center_freq2);
		break;
	}

	return r;
}

static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy,
						    u32 center_freq,
						    u32 bandwidth)
{
	struct ieee80211_channel *c;
	u32 start_freq, end_freq, freq;
	unsigned int dfs_cac_ms = 0;

	start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
	end_freq = cfg80211_get_end_freq(center_freq, bandwidth);

	for (freq = start_freq; freq <= end_freq; freq += 20) {
		c = ieee80211_get_channel(wiphy, freq);
		if (!c)
			return 0;

		if (c->flags & IEEE80211_CHAN_DISABLED)
			return 0;

		if (!(c->flags & IEEE80211_CHAN_RADAR))
			continue;

		if (c->dfs_cac_ms > dfs_cac_ms)
			dfs_cac_ms = c->dfs_cac_ms;
	}

	return dfs_cac_ms;
}

unsigned int
cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
			      const struct cfg80211_chan_def *chandef)
{
	int width;
	unsigned int t1 = 0, t2 = 0;

	if (WARN_ON(!cfg80211_chandef_valid(chandef)))
		return 0;

	width = cfg80211_chandef_get_width(chandef);
	if (width < 0)
		return 0;

	t1 = cfg80211_get_chans_dfs_cac_time(wiphy,
					     chandef->center_freq1,
					     width);

	if (!chandef->center_freq2)
		return t1;

	t2 = cfg80211_get_chans_dfs_cac_time(wiphy,
					     chandef->center_freq2,
					     width);

	return max(t1, t2);
}

static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
					u32 center_freq, u32 bandwidth,
					u32 prohibited_flags)
{
	struct ieee80211_channel *c;
	u32 freq, start_freq, end_freq;

	start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
	end_freq = cfg80211_get_end_freq(center_freq, bandwidth);

	for (freq = start_freq; freq <= end_freq; freq += 20) {
		c = ieee80211_get_channel(wiphy, freq);
		if (!c || c->flags & prohibited_flags)
			return false;
	}

	return true;
}

bool cfg80211_chandef_usable(struct wiphy *wiphy,
			     const struct cfg80211_chan_def *chandef,
			     u32 prohibited_flags)
{
	struct ieee80211_sta_ht_cap *ht_cap;
	struct ieee80211_sta_vht_cap *vht_cap;
	u32 width, control_freq;

	if (WARN_ON(!cfg80211_chandef_valid(chandef)))
		return false;

	ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap;
	vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap;

	control_freq = chandef->chan->center_freq;

	switch (chandef->width) {
	case NL80211_CHAN_WIDTH_5:
		width = 5;
		break;
	case NL80211_CHAN_WIDTH_10:
		prohibited_flags |= IEEE80211_CHAN_NO_10MHZ;
		width = 10;
		break;
	case NL80211_CHAN_WIDTH_20:
		if (!ht_cap->ht_supported)
			return false;
	case NL80211_CHAN_WIDTH_20_NOHT:
		prohibited_flags |= IEEE80211_CHAN_NO_20MHZ;
		width = 20;
		break;
	case NL80211_CHAN_WIDTH_40:
		width = 40;
		if (!ht_cap->ht_supported)
			return false;
		if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
		    ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
			return false;
		if (chandef->center_freq1 < control_freq &&
		    chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
			return false;
		if (chandef->center_freq1 > control_freq &&
		    chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
			return false;
		break;
	case NL80211_CHAN_WIDTH_80P80:
		if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ))
			return false;
	case NL80211_CHAN_WIDTH_80:
		if (!vht_cap->vht_supported)
			return false;
		prohibited_flags |= IEEE80211_CHAN_NO_80MHZ;
		width = 80;
		break;
	case NL80211_CHAN_WIDTH_160:
		if (!vht_cap->vht_supported)
			return false;
		if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ))
			return false;
		prohibited_flags |= IEEE80211_CHAN_NO_160MHZ;
		width = 160;
		break;
	default:
		WARN_ON_ONCE(1);
		return false;
	}

	/*
	 * TODO: What if there are only certain 80/160/80+80 MHz channels
	 *	 allowed by the driver, or only certain combinations?
	 *	 For 40 MHz the driver can set the NO_HT40 flags, but for
	 *	 80/160 MHz and in particular 80+80 MHz this isn't really
	 *	 feasible and we only have NO_80MHZ/NO_160MHZ so far but
	 *	 no way to cover 80+80 MHz or more complex restrictions.
	 *	 Note that such restrictions also need to be advertised to
	 *	 userspace, for example for P2P channel selection.
	 */

	if (width > 20)
		prohibited_flags |= IEEE80211_CHAN_NO_OFDM;

	/* 5 and 10 MHz are only defined for the OFDM PHY */
	if (width < 20)
		prohibited_flags |= IEEE80211_CHAN_NO_OFDM;


	if (!cfg80211_secondary_chans_ok(wiphy, chandef->center_freq1,
					 width, prohibited_flags))
		return false;

	if (!chandef->center_freq2)
		return true;
	return cfg80211_secondary_chans_ok(wiphy, chandef->center_freq2,
					   width, prohibited_flags);
}
EXPORT_SYMBOL(cfg80211_chandef_usable);

/*
 * For GO only, check if the channel can be used under permissive conditions
 * mandated by the some regulatory bodies, i.e., the channel is marked with
 * IEEE80211_CHAN_GO_CONCURRENT and there is an additional station interface
 * associated to an AP on the same channel or on the same UNII band
 * (assuming that the AP is an authorized master).
 * In addition allow the GO to operate on a channel on which indoor operation is
 * allowed, iff we are currently operating in an indoor environment.
 */
static bool cfg80211_go_permissive_chan(struct cfg80211_registered_device *rdev,
					struct ieee80211_channel *chan)
{
	struct wireless_dev *wdev_iter;
	struct wiphy *wiphy = wiphy_idx_to_wiphy(rdev->wiphy_idx);

	ASSERT_RTNL();

	if (!config_enabled(CONFIG_CFG80211_REG_RELAX_NO_IR) ||
	    !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR))
		return false;

	if (regulatory_indoor_allowed() &&
	    (chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
		return true;

	if (!(chan->flags & IEEE80211_CHAN_GO_CONCURRENT))
		return false;

	/*
	 * Generally, it is possible to rely on another device/driver to allow
	 * the GO concurrent relaxation, however, since the device can further
	 * enforce the relaxation (by doing a similar verifications as this),
	 * and thus fail the GO instantiation, consider only the interfaces of
	 * the current registered device.
	 */
	list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
		struct ieee80211_channel *other_chan = NULL;
		int r1, r2;

		if (wdev_iter->iftype != NL80211_IFTYPE_STATION ||
		    !netif_running(wdev_iter->netdev))
			continue;

		wdev_lock(wdev_iter);
		if (wdev_iter->current_bss)
			other_chan = wdev_iter->current_bss->pub.channel;
		wdev_unlock(wdev_iter);

		if (!other_chan)
			continue;

		if (chan == other_chan)
			return true;

		if (chan->band != IEEE80211_BAND_5GHZ)
			continue;

		r1 = cfg80211_get_unii(chan->center_freq);
		r2 = cfg80211_get_unii(other_chan->center_freq);

		if (r1 != -EINVAL && r1 == r2) {
			/*
			 * At some locations channels 149-165 are considered a
			 * bundle, but at other locations, e.g., Indonesia,
			 * channels 149-161 are considered a bundle while
			 * channel 165 is left out and considered to be in a
			 * different bundle. Thus, in case that there is a
			 * station interface connected to an AP on channel 165,
			 * it is assumed that channels 149-161 are allowed for
			 * GO operations. However, having a station interface
			 * connected to an AP on channels 149-161, does not
			 * allow GO operation on channel 165.
			 */
			if (chan->center_freq == 5825 &&
			    other_chan->center_freq != 5825)
				continue;
			return true;
		}
	}

	return false;
}

bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
			     struct cfg80211_chan_def *chandef,
			     enum nl80211_iftype iftype)
{
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
	bool res;
	u32 prohibited_flags = IEEE80211_CHAN_DISABLED |
			       IEEE80211_CHAN_RADAR;

	trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype);

	/*
	 * Under certain conditions suggested by the some regulatory bodies
	 * a GO can operate on channels marked with IEEE80211_NO_IR
	 * so set this flag only if such relaxations are not enabled and
	 * the conditions are not met.
	 */
	if (iftype != NL80211_IFTYPE_P2P_GO ||
	    !cfg80211_go_permissive_chan(rdev, chandef->chan))
		prohibited_flags |= IEEE80211_CHAN_NO_IR;

	if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 &&
	    cfg80211_chandef_dfs_available(wiphy, chandef)) {
		/* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */
		prohibited_flags = IEEE80211_CHAN_DISABLED;
	}

	res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags);

	trace_cfg80211_return_bool(res);
	return res;
}
EXPORT_SYMBOL(cfg80211_reg_can_beacon);

int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
				 struct cfg80211_chan_def *chandef)
{
	if (!rdev->ops->set_monitor_channel)
		return -EOPNOTSUPP;
	if (!cfg80211_has_monitors_only(rdev))
		return -EBUSY;

	return rdev_set_monitor_channel(rdev, chandef);
}

void
cfg80211_get_chan_state(struct wireless_dev *wdev,
		        struct ieee80211_channel **chan,
		        enum cfg80211_chan_mode *chanmode,
		        u8 *radar_detect)
{
	int ret;

	*chan = NULL;
	*chanmode = CHAN_MODE_UNDEFINED;

	ASSERT_WDEV_LOCK(wdev);

	if (wdev->netdev && !netif_running(wdev->netdev))
		return;

	switch (wdev->iftype) {
	case NL80211_IFTYPE_ADHOC:
		if (wdev->current_bss) {
			*chan = wdev->current_bss->pub.channel;
			*chanmode = (wdev->ibss_fixed &&
				     !wdev->ibss_dfs_possible)
				  ? CHAN_MODE_SHARED
				  : CHAN_MODE_EXCLUSIVE;

			/* consider worst-case - IBSS can try to return to the
			 * original user-specified channel as creator */
			if (wdev->ibss_dfs_possible)
				*radar_detect |= BIT(wdev->chandef.width);
			return;
		}
		break;
	case NL80211_IFTYPE_STATION:
	case NL80211_IFTYPE_P2P_CLIENT:
		if (wdev->current_bss) {
			*chan = wdev->current_bss->pub.channel;
			*chanmode = CHAN_MODE_SHARED;
			return;
		}
		break;
	case NL80211_IFTYPE_AP:
	case NL80211_IFTYPE_P2P_GO:
		if (wdev->cac_started) {
			*chan = wdev->chandef.chan;
			*chanmode = CHAN_MODE_SHARED;
			*radar_detect |= BIT(wdev->chandef.width);
		} else if (wdev->beacon_interval) {
			*chan = wdev->chandef.chan;
			*chanmode = CHAN_MODE_SHARED;

			ret = cfg80211_chandef_dfs_required(wdev->wiphy,
							    &wdev->chandef,
							    wdev->iftype);
			WARN_ON(ret < 0);
			if (ret > 0)
				*radar_detect |= BIT(wdev->chandef.width);
		}
		return;
	case NL80211_IFTYPE_MESH_POINT:
		if (wdev->mesh_id_len) {
			*chan = wdev->chandef.chan;
			*chanmode = CHAN_MODE_SHARED;

			ret = cfg80211_chandef_dfs_required(wdev->wiphy,
							    &wdev->chandef,
							    wdev->iftype);
			WARN_ON(ret < 0);
			if (ret > 0)
				*radar_detect |= BIT(wdev->chandef.width);
		}
		return;
	case NL80211_IFTYPE_MONITOR:
	case NL80211_IFTYPE_AP_VLAN:
	case NL80211_IFTYPE_WDS:
	case NL80211_IFTYPE_P2P_DEVICE:
		/* these interface types don't really have a channel */
		return;
	case NL80211_IFTYPE_UNSPECIFIED:
	case NUM_NL80211_IFTYPES:
		WARN_ON(1);
	}
}