aboutsummaryrefslogtreecommitdiffstats
path: root/src/ap/hw_features.c
blob: 16887acdfef49e27e5c561b4379f57f2408056f9 (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
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
/*
 * hostapd / Hardware feature query and different modes
 * Copyright 2002-2003, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright (c) 2008-2012, Jouni Malinen <j@w1.fi>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */

#include "utils/includes.h"

#include "utils/common.h"
#include "utils/eloop.h"
#include "common/ieee802_11_defs.h"
#include "common/ieee802_11_common.h"
#include "common/wpa_ctrl.h"
#include "common/hw_features_common.h"
#include "hostapd.h"
#include "ap_config.h"
#include "ap_drv_ops.h"
#include "acs.h"
#include "ieee802_11.h"
#include "beacon.h"
#include "hw_features.h"


void hostapd_free_hw_features(struct hostapd_hw_modes *hw_features,
			      size_t num_hw_features)
{
	size_t i;

	if (hw_features == NULL)
		return;

	for (i = 0; i < num_hw_features; i++) {
		os_free(hw_features[i].channels);
		os_free(hw_features[i].rates);
	}

	os_free(hw_features);
}


#ifndef CONFIG_NO_STDOUT_DEBUG
static char * dfs_info(struct hostapd_channel_data *chan)
{
	static char info[256];
	char *state;

	switch (chan->flag & HOSTAPD_CHAN_DFS_MASK) {
	case HOSTAPD_CHAN_DFS_UNKNOWN:
		state = "unknown";
		break;
	case HOSTAPD_CHAN_DFS_USABLE:
		state = "usable";
		break;
	case HOSTAPD_CHAN_DFS_UNAVAILABLE:
		state = "unavailable";
		break;
	case HOSTAPD_CHAN_DFS_AVAILABLE:
		state = "available";
		break;
	default:
		return "";
	}
	os_snprintf(info, sizeof(info), " (DFS state = %s)", state);
	info[sizeof(info) - 1] = '\0';

	return info;
}
#endif /* CONFIG_NO_STDOUT_DEBUG */


int hostapd_get_hw_features(struct hostapd_iface *iface)
{
	struct hostapd_data *hapd = iface->bss[0];
	int i, j;
	u16 num_modes, flags;
	struct hostapd_hw_modes *modes;

	if (hostapd_drv_none(hapd))
		return -1;
	modes = hostapd_get_hw_feature_data(hapd, &num_modes, &flags);
	if (modes == NULL) {
		hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
			       HOSTAPD_LEVEL_DEBUG,
			       "Fetching hardware channel/rate support not "
			       "supported.");
		return -1;
	}

	iface->hw_flags = flags;

	hostapd_free_hw_features(iface->hw_features, iface->num_hw_features);
	iface->hw_features = modes;
	iface->num_hw_features = num_modes;

	for (i = 0; i < num_modes; i++) {
		struct hostapd_hw_modes *feature = &modes[i];
		int dfs_enabled = hapd->iconf->ieee80211h &&
			(iface->drv_flags & WPA_DRIVER_FLAGS_RADAR);

		/* set flag for channels we can use in current regulatory
		 * domain */
		for (j = 0; j < feature->num_channels; j++) {
			int dfs = 0;

			/*
			 * Disable all channels that are marked not to allow
			 * to initiate radiation (a.k.a. passive scan and no
			 * IBSS).
			 * Use radar channels only if the driver supports DFS.
			 */
			if ((feature->channels[j].flag &
			     HOSTAPD_CHAN_RADAR) && dfs_enabled) {
				dfs = 1;
			} else if (((feature->channels[j].flag &
				     HOSTAPD_CHAN_RADAR) &&
				    !(iface->drv_flags &
				      WPA_DRIVER_FLAGS_DFS_OFFLOAD)) ||
				   (feature->channels[j].flag &
				    HOSTAPD_CHAN_NO_IR)) {
				feature->channels[j].flag |=
					HOSTAPD_CHAN_DISABLED;
			}

			if (feature->channels[j].flag & HOSTAPD_CHAN_DISABLED)
				continue;

			wpa_printf(MSG_MSGDUMP, "Allowed channel: mode=%d "
				   "chan=%d freq=%d MHz max_tx_power=%d dBm%s",
				   feature->mode,
				   feature->channels[j].chan,
				   feature->channels[j].freq,
				   feature->channels[j].max_tx_power,
				   dfs ? dfs_info(&feature->channels[j]) : "");
		}
	}

	return 0;
}


int hostapd_prepare_rates(struct hostapd_iface *iface,
			  struct hostapd_hw_modes *mode)
{
	int i, num_basic_rates = 0;
	int basic_rates_a[] = { 60, 120, 240, -1 };
	int basic_rates_b[] = { 10, 20, -1 };
	int basic_rates_g[] = { 10, 20, 55, 110, -1 };
	int *basic_rates;

	if (iface->conf->basic_rates)
		basic_rates = iface->conf->basic_rates;
	else switch (mode->mode) {
	case HOSTAPD_MODE_IEEE80211A:
		basic_rates = basic_rates_a;
		break;
	case HOSTAPD_MODE_IEEE80211B:
		basic_rates = basic_rates_b;
		break;
	case HOSTAPD_MODE_IEEE80211G:
		basic_rates = basic_rates_g;
		break;
	case HOSTAPD_MODE_IEEE80211AD:
		return 0; /* No basic rates for 11ad */
	default:
		return -1;
	}

	i = 0;
	while (basic_rates[i] >= 0)
		i++;
	if (i)
		i++; /* -1 termination */
	os_free(iface->basic_rates);
	iface->basic_rates = os_malloc(i * sizeof(int));
	if (iface->basic_rates)
		os_memcpy(iface->basic_rates, basic_rates, i * sizeof(int));

	os_free(iface->current_rates);
	iface->num_rates = 0;

	iface->current_rates =
		os_calloc(mode->num_rates, sizeof(struct hostapd_rate_data));
	if (!iface->current_rates) {
		wpa_printf(MSG_ERROR, "Failed to allocate memory for rate "
			   "table.");
		return -1;
	}

	for (i = 0; i < mode->num_rates; i++) {
		struct hostapd_rate_data *rate;

		if (iface->conf->supported_rates &&
		    !hostapd_rate_found(iface->conf->supported_rates,
					mode->rates[i]))
			continue;

		rate = &iface->current_rates[iface->num_rates];
		rate->rate = mode->rates[i];
		if (hostapd_rate_found(basic_rates, rate->rate)) {
			rate->flags |= HOSTAPD_RATE_BASIC;
			num_basic_rates++;
		}
		wpa_printf(MSG_DEBUG, "RATE[%d] rate=%d flags=0x%x",
			   iface->num_rates, rate->rate, rate->flags);
		iface->num_rates++;
	}

	if ((iface->num_rates == 0 || num_basic_rates == 0) &&
	    (!iface->conf->ieee80211n || !iface->conf->require_ht)) {
		wpa_printf(MSG_ERROR, "No rates remaining in supported/basic "
			   "rate sets (%d,%d).",
			   iface->num_rates, num_basic_rates);
		return -1;
	}

	return 0;
}


#ifdef CONFIG_IEEE80211N
static int ieee80211n_allowed_ht40_channel_pair(struct hostapd_iface *iface)
{
	int pri_chan, sec_chan;

	if (!iface->conf->secondary_channel)
		return 1; /* HT40 not used */

	pri_chan = iface->conf->channel;
	sec_chan = pri_chan + iface->conf->secondary_channel * 4;

	return allowed_ht40_channel_pair(iface->current_mode, pri_chan,
					 sec_chan);
}


static void ieee80211n_switch_pri_sec(struct hostapd_iface *iface)
{
	if (iface->conf->secondary_channel > 0) {
		iface->conf->channel += 4;
		iface->conf->secondary_channel = -1;
	} else {
		iface->conf->channel -= 4;
		iface->conf->secondary_channel = 1;
	}
}


static int ieee80211n_check_40mhz_5g(struct hostapd_iface *iface,
				     struct wpa_scan_results *scan_res)
{
	int pri_chan, sec_chan;
	int res;

	pri_chan = iface->conf->channel;
	sec_chan = pri_chan + iface->conf->secondary_channel * 4;

	res = check_40mhz_5g(iface->current_mode, scan_res, pri_chan, sec_chan);

	if (res == 2) {
		if (iface->conf->no_pri_sec_switch) {
			wpa_printf(MSG_DEBUG,
				   "Cannot switch PRI/SEC channels due to local constraint");
		} else {
			ieee80211n_switch_pri_sec(iface);
		}
	}

	return !!res;
}


static int ieee80211n_check_40mhz_2g4(struct hostapd_iface *iface,
				      struct wpa_scan_results *scan_res)
{
	int pri_chan, sec_chan;

	pri_chan = iface->conf->channel;
	sec_chan = pri_chan + iface->conf->secondary_channel * 4;

	return check_40mhz_2g4(iface->current_mode, scan_res, pri_chan,
			       sec_chan);
}


static void ieee80211n_check_scan(struct hostapd_iface *iface)
{
	struct wpa_scan_results *scan_res;
	int oper40;
	int res;

	/* Check list of neighboring BSSes (from scan) to see whether 40 MHz is
	 * allowed per IEEE Std 802.11-2012, 10.15.3.2 */

	iface->scan_cb = NULL;

	scan_res = hostapd_driver_get_scan_results(iface->bss[0]);
	if (scan_res == NULL) {
		hostapd_setup_interface_complete(iface, 1);
		return;
	}

	if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A)
		oper40 = ieee80211n_check_40mhz_5g(iface, scan_res);
	else
		oper40 = ieee80211n_check_40mhz_2g4(iface, scan_res);
	wpa_scan_results_free(scan_res);

	iface->secondary_ch = iface->conf->secondary_channel;
	if (!oper40) {
		wpa_printf(MSG_INFO, "20/40 MHz operation not permitted on "
			   "channel pri=%d sec=%d based on overlapping BSSes",
			   iface->conf->channel,
			   iface->conf->channel +
			   iface->conf->secondary_channel * 4);
		iface->conf->secondary_channel = 0;
		if (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX) {
			/*
			 * TODO: Could consider scheduling another scan to check
			 * if channel width can be changed if no coex reports
			 * are received from associating stations.
			 */
		}
	}

	res = ieee80211n_allowed_ht40_channel_pair(iface);
	if (!res) {
		iface->conf->secondary_channel = 0;
		res = 1;
		wpa_printf(MSG_INFO, "Fallback to 20 MHz");
	}

	hostapd_setup_interface_complete(iface, !res);
}


static void ieee80211n_scan_channels_2g4(struct hostapd_iface *iface,
					 struct wpa_driver_scan_params *params)
{
	/* Scan only the affected frequency range */
	int pri_freq, sec_freq;
	int affected_start, affected_end;
	int i, pos;
	struct hostapd_hw_modes *mode;

	if (iface->current_mode == NULL)
		return;

	pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel);
	if (iface->conf->secondary_channel > 0)
		sec_freq = pri_freq + 20;
	else
		sec_freq = pri_freq - 20;
	/*
	 * Note: Need to find the PRI channel also in cases where the affected
	 * channel is the SEC channel of a 40 MHz BSS, so need to include the
	 * scanning coverage here to be 40 MHz from the center frequency.
	 */
	affected_start = (pri_freq + sec_freq) / 2 - 40;
	affected_end = (pri_freq + sec_freq) / 2 + 40;
	wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
		   affected_start, affected_end);

	mode = iface->current_mode;
	params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
	if (params->freqs == NULL)
		return;
	pos = 0;

	for (i = 0; i < mode->num_channels; i++) {
		struct hostapd_channel_data *chan = &mode->channels[i];
		if (chan->flag & HOSTAPD_CHAN_DISABLED)
			continue;
		if (chan->freq < affected_start ||
		    chan->freq > affected_end)
			continue;
		params->freqs[pos++] = chan->freq;
	}
}


static void ieee80211n_scan_channels_5g(struct hostapd_iface *iface,
					struct wpa_driver_scan_params *params)
{
	/* Scan only the affected frequency range */
	int pri_freq;
	int affected_start, affected_end;
	int i, pos;
	struct hostapd_hw_modes *mode;

	if (iface->current_mode == NULL)
		return;

	pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel);
	if (iface->conf->secondary_channel > 0) {
		affected_start = pri_freq - 10;
		affected_end = pri_freq + 30;
	} else {
		affected_start = pri_freq - 30;
		affected_end = pri_freq + 10;
	}
	wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
		   affected_start, affected_end);

	mode = iface->current_mode;
	params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
	if (params->freqs == NULL)
		return;
	pos = 0;

	for (i = 0; i < mode->num_channels; i++) {
		struct hostapd_channel_data *chan = &mode->channels[i];
		if (chan->flag & HOSTAPD_CHAN_DISABLED)
			continue;
		if (chan->freq < affected_start ||
		    chan->freq > affected_end)
			continue;
		params->freqs[pos++] = chan->freq;
	}
}


static void ap_ht40_scan_retry(void *eloop_data, void *user_data)
{
#define HT2040_COEX_SCAN_RETRY 15
	struct hostapd_iface *iface = eloop_data;
	struct wpa_driver_scan_params params;
	int ret;

	os_memset(&params, 0, sizeof(params));
	if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
		ieee80211n_scan_channels_2g4(iface, &params);
	else
		ieee80211n_scan_channels_5g(iface, &params);

	ret = hostapd_driver_scan(iface->bss[0], &params);
	iface->num_ht40_scan_tries++;
	os_free(params.freqs);

	if (ret == -EBUSY &&
	    iface->num_ht40_scan_tries < HT2040_COEX_SCAN_RETRY) {
		wpa_printf(MSG_ERROR,
			   "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again (attempt %d)",
			   ret, strerror(-ret), iface->num_ht40_scan_tries);
		eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL);
		return;
	}

	if (ret == 0) {
		iface->scan_cb = ieee80211n_check_scan;
		return;
	}

	wpa_printf(MSG_DEBUG,
		   "Failed to request a scan in device, bringing up in HT20 mode");
	iface->conf->secondary_channel = 0;
	iface->conf->ht_capab &= ~HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET;
	hostapd_setup_interface_complete(iface, 0);
}


void hostapd_stop_setup_timers(struct hostapd_iface *iface)
{
	eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL);
}


static int ieee80211n_check_40mhz(struct hostapd_iface *iface)
{
	struct wpa_driver_scan_params params;
	int ret;

	/* Check that HT40 is used and PRI / SEC switch is allowed */
	if (!iface->conf->secondary_channel || iface->conf->no_pri_sec_switch)
		return 0;

	hostapd_set_state(iface, HAPD_IFACE_HT_SCAN);
	wpa_printf(MSG_DEBUG, "Scan for neighboring BSSes prior to enabling "
		   "40 MHz channel");
	os_memset(&params, 0, sizeof(params));
	if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
		ieee80211n_scan_channels_2g4(iface, &params);
	else
		ieee80211n_scan_channels_5g(iface, &params);

	ret = hostapd_driver_scan(iface->bss[0], &params);
	os_free(params.freqs);

	if (ret == -EBUSY) {
		wpa_printf(MSG_ERROR,
			   "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again",
			   ret, strerror(-ret));
		iface->num_ht40_scan_tries = 1;
		eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL);
		eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL);
		return 1;
	}

	if (ret < 0) {
		wpa_printf(MSG_ERROR,
			   "Failed to request a scan of neighboring BSSes ret=%d (%s)",
			   ret, strerror(-ret));
		return -1;
	}

	iface->scan_cb = ieee80211n_check_scan;
	return 1;
}


static int ieee80211n_supported_ht_capab(struct hostapd_iface *iface)
{
	u16 hw = iface->current_mode->ht_capab;
	u16 conf = iface->conf->ht_capab;

	if ((conf & HT_CAP_INFO_LDPC_CODING_CAP) &&
	    !(hw & HT_CAP_INFO_LDPC_CODING_CAP)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [LDPC]");
		return 0;
	}

	/*
	 * Driver ACS chosen channel may not be HT40 due to internal driver
	 * restrictions.
	 */
	if (!iface->conf->acs && (conf & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) &&
	    !(hw & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [HT40*]");
		return 0;
	}

	switch (conf & HT_CAP_INFO_SMPS_MASK) {
	case HT_CAP_INFO_SMPS_STATIC:
		if (!(iface->smps_modes & WPA_DRIVER_SMPS_MODE_STATIC)) {
			wpa_printf(MSG_ERROR,
				   "Driver does not support configured HT capability [SMPS-STATIC]");
			return 0;
		}
		break;
	case HT_CAP_INFO_SMPS_DYNAMIC:
		if (!(iface->smps_modes & WPA_DRIVER_SMPS_MODE_DYNAMIC)) {
			wpa_printf(MSG_ERROR,
				   "Driver does not support configured HT capability [SMPS-DYNAMIC]");
			return 0;
		}
		break;
	case HT_CAP_INFO_SMPS_DISABLED:
	default:
		break;
	}

	if ((conf & HT_CAP_INFO_GREEN_FIELD) &&
	    !(hw & HT_CAP_INFO_GREEN_FIELD)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [GF]");
		return 0;
	}

	if ((conf & HT_CAP_INFO_SHORT_GI20MHZ) &&
	    !(hw & HT_CAP_INFO_SHORT_GI20MHZ)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [SHORT-GI-20]");
		return 0;
	}

	if ((conf & HT_CAP_INFO_SHORT_GI40MHZ) &&
	    !(hw & HT_CAP_INFO_SHORT_GI40MHZ)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [SHORT-GI-40]");
		return 0;
	}

	if ((conf & HT_CAP_INFO_TX_STBC) && !(hw & HT_CAP_INFO_TX_STBC)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [TX-STBC]");
		return 0;
	}

	if ((conf & HT_CAP_INFO_RX_STBC_MASK) >
	    (hw & HT_CAP_INFO_RX_STBC_MASK)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [RX-STBC*]");
		return 0;
	}

	if ((conf & HT_CAP_INFO_DELAYED_BA) &&
	    !(hw & HT_CAP_INFO_DELAYED_BA)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [DELAYED-BA]");
		return 0;
	}

	if ((conf & HT_CAP_INFO_MAX_AMSDU_SIZE) &&
	    !(hw & HT_CAP_INFO_MAX_AMSDU_SIZE)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [MAX-AMSDU-7935]");
		return 0;
	}

	if ((conf & HT_CAP_INFO_DSSS_CCK40MHZ) &&
	    !(hw & HT_CAP_INFO_DSSS_CCK40MHZ)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [DSSS_CCK-40]");
		return 0;
	}

	if ((conf & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT) &&
	    !(hw & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [LSIG-TXOP-PROT]");
		return 0;
	}

	return 1;
}


#ifdef CONFIG_IEEE80211AC

static int ieee80211ac_cap_check(u32 hw, u32 conf, u32 cap, const char *name)
{
	u32 req_cap = conf & cap;

	/*
	 * Make sure we support all requested capabilities.
	 * NOTE: We assume that 'cap' represents a capability mask,
	 * not a discrete value.
	 */
	if ((hw & req_cap) != req_cap) {
		wpa_printf(MSG_ERROR, "Driver does not support configured VHT capability [%s]",
			   name);
		return 0;
	}
	return 1;
}


static int ieee80211ac_cap_check_max(u32 hw, u32 conf, u32 mask,
				     unsigned int shift,
				     const char *name)
{
	u32 hw_max = hw & mask;
	u32 conf_val = conf & mask;

	if (conf_val > hw_max) {
		wpa_printf(MSG_ERROR, "Configured VHT capability [%s] exceeds max value supported by the driver (%d > %d)",
			   name, conf_val >> shift, hw_max >> shift);
		return 0;
	}
	return 1;
}


static int ieee80211ac_supported_vht_capab(struct hostapd_iface *iface)
{
	struct hostapd_hw_modes *mode = iface->current_mode;
	u32 hw = mode->vht_capab;
	u32 conf = iface->conf->vht_capab;

	wpa_printf(MSG_DEBUG, "hw vht capab: 0x%x, conf vht capab: 0x%x",
		   hw, conf);

	if (mode->mode == HOSTAPD_MODE_IEEE80211G &&
	    iface->conf->bss[0]->vendor_vht &&
	    mode->vht_capab == 0 && iface->hw_features) {
		int i;

		for (i = 0; i < iface->num_hw_features; i++) {
			if (iface->hw_features[i].mode ==
			    HOSTAPD_MODE_IEEE80211A) {
				mode = &iface->hw_features[i];
				hw = mode->vht_capab;
				wpa_printf(MSG_DEBUG,
					   "update hw vht capab based on 5 GHz band: 0x%x",
					   hw);
				break;
			}
		}
	}

#define VHT_CAP_CHECK(cap) \
	do { \
		if (!ieee80211ac_cap_check(hw, conf, cap, #cap)) \
			return 0; \
	} while (0)

#define VHT_CAP_CHECK_MAX(cap) \
	do { \
		if (!ieee80211ac_cap_check_max(hw, conf, cap, cap ## _SHIFT, \
					       #cap)) \
			return 0; \
	} while (0)

	VHT_CAP_CHECK_MAX(VHT_CAP_MAX_MPDU_LENGTH_MASK);
	VHT_CAP_CHECK(VHT_CAP_SUPP_CHAN_WIDTH_160MHZ);
	VHT_CAP_CHECK(VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ);
	VHT_CAP_CHECK(VHT_CAP_RXLDPC);
	VHT_CAP_CHECK(VHT_CAP_SHORT_GI_80);
	VHT_CAP_CHECK(VHT_CAP_SHORT_GI_160);
	VHT_CAP_CHECK(VHT_CAP_TXSTBC);
	VHT_CAP_CHECK_MAX(VHT_CAP_RXSTBC_MASK);
	VHT_CAP_CHECK(VHT_CAP_SU_BEAMFORMER_CAPABLE);
	VHT_CAP_CHECK(VHT_CAP_SU_BEAMFORMEE_CAPABLE);
	VHT_CAP_CHECK_MAX(VHT_CAP_BEAMFORMEE_STS_MAX);
	VHT_CAP_CHECK_MAX(VHT_CAP_SOUNDING_DIMENSION_MAX);
	VHT_CAP_CHECK(VHT_CAP_MU_BEAMFORMER_CAPABLE);
	VHT_CAP_CHECK(VHT_CAP_MU_BEAMFORMEE_CAPABLE);
	VHT_CAP_CHECK(VHT_CAP_VHT_TXOP_PS);
	VHT_CAP_CHECK(VHT_CAP_HTC_VHT);
	VHT_CAP_CHECK_MAX(VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MAX);
	VHT_CAP_CHECK(VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB);
	VHT_CAP_CHECK(VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB);
	VHT_CAP_CHECK(VHT_CAP_RX_ANTENNA_PATTERN);
	VHT_CAP_CHECK(VHT_CAP_TX_ANTENNA_PATTERN);

#undef VHT_CAP_CHECK
#undef VHT_CAP_CHECK_MAX

	return 1;
}
#endif /* CONFIG_IEEE80211AC */

#endif /* CONFIG_IEEE80211N */


int hostapd_check_ht_capab(struct hostapd_iface *iface)
{
#ifdef CONFIG_IEEE80211N
	int ret;
	if (!iface->conf->ieee80211n)
		return 0;

	if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211B &&
	    iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G &&
	    (iface->conf->ht_capab & HT_CAP_INFO_DSSS_CCK40MHZ)) {
		wpa_printf(MSG_DEBUG,
			   "Disable HT capability [DSSS_CCK-40] on 5 GHz band");
		iface->conf->ht_capab &= ~HT_CAP_INFO_DSSS_CCK40MHZ;
	}

	if (!ieee80211n_supported_ht_capab(iface))
		return -1;
#ifdef CONFIG_IEEE80211AC
	if (!ieee80211ac_supported_vht_capab(iface))
		return -1;
#endif /* CONFIG_IEEE80211AC */
	ret = ieee80211n_check_40mhz(iface);
	if (ret)
		return ret;
	if (!ieee80211n_allowed_ht40_channel_pair(iface))
		return -1;
#endif /* CONFIG_IEEE80211N */

	return 0;
}


static int hostapd_is_usable_chan(struct hostapd_iface *iface,
				  int channel, int primary)
{
	int i;
	struct hostapd_channel_data *chan;

	if (!iface->current_mode)
		return 0;

	for (i = 0; i < iface->current_mode->num_channels; i++) {
		chan = &iface->current_mode->channels[i];
		if (chan->chan != channel)
			continue;

		if (!(chan->flag & HOSTAPD_CHAN_DISABLED))
			return 1;

		wpa_printf(MSG_DEBUG,
			   "%schannel [%i] (%i) is disabled for use in AP mode, flags: 0x%x%s%s",
			   primary ? "" : "Configured HT40 secondary ",
			   i, chan->chan, chan->flag,
			   chan->flag & HOSTAPD_CHAN_NO_IR ? " NO-IR" : "",
			   chan->flag & HOSTAPD_CHAN_RADAR ? " RADAR" : "");
	}

	return 0;
}


static int hostapd_is_usable_chans(struct hostapd_iface *iface)
{
	if (!hostapd_is_usable_chan(iface, iface->conf->channel, 1))
		return 0;

	if (!iface->conf->secondary_channel)
		return 1;

	return hostapd_is_usable_chan(iface, iface->conf->channel +
				      iface->conf->secondary_channel * 4, 0);
}


static enum hostapd_chan_status
hostapd_check_chans(struct hostapd_iface *iface)
{
	if (iface->conf->channel) {
		if (hostapd_is_usable_chans(iface))
			return HOSTAPD_CHAN_VALID;
		else
			return HOSTAPD_CHAN_INVALID;
	}

	/*
	 * The user set channel=0 or channel=acs_survey
	 * which is used to trigger ACS.
	 */

	switch (acs_init(iface)) {
	case HOSTAPD_CHAN_ACS:
		return HOSTAPD_CHAN_ACS;
	case HOSTAPD_CHAN_VALID:
	case HOSTAPD_CHAN_INVALID:
	default:
		return HOSTAPD_CHAN_INVALID;
	}
}


static void hostapd_notify_bad_chans(struct hostapd_iface *iface)
{
	if (!iface->current_mode) {
		hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
			       HOSTAPD_LEVEL_WARNING,
			       "Hardware does not support configured mode");
		return;
	}
	hostapd_logger(iface->bss[0], NULL,
		       HOSTAPD_MODULE_IEEE80211,
		       HOSTAPD_LEVEL_WARNING,
		       "Configured channel (%d) not found from the "
		       "channel list of current mode (%d) %s",
		       iface->conf->channel,
		       iface->current_mode->mode,
		       hostapd_hw_mode_txt(iface->current_mode->mode));
	hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
		       HOSTAPD_LEVEL_WARNING,
		       "Hardware does not support configured channel");
}


int hostapd_acs_completed(struct hostapd_iface *iface, int err)
{
	int ret = -1;

	if (err)
		goto out;

	switch (hostapd_check_chans(iface)) {
	case HOSTAPD_CHAN_VALID:
		wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO,
			ACS_EVENT_COMPLETED "freq=%d channel=%d",
			hostapd_hw_get_freq(iface->bss[0],
					    iface->conf->channel),
			iface->conf->channel);
		break;
	case HOSTAPD_CHAN_ACS:
		wpa_printf(MSG_ERROR, "ACS error - reported complete, but no result available");
		wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED);
		hostapd_notify_bad_chans(iface);
		goto out;
	case HOSTAPD_CHAN_INVALID:
	default:
		wpa_printf(MSG_ERROR, "ACS picked unusable channels");
		wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED);
		hostapd_notify_bad_chans(iface);
		goto out;
	}

	ret = hostapd_check_ht_capab(iface);
	if (ret < 0)
		goto out;
	if (ret == 1) {
		wpa_printf(MSG_DEBUG, "Interface initialization will be completed in a callback");
		return 0;
	}

	ret = 0;
out:
	return hostapd_setup_interface_complete(iface, ret);
}


/**
 * hostapd_select_hw_mode - Select the hardware mode
 * @iface: Pointer to interface data.
 * Returns: 0 on success, < 0 on failure
 *
 * Sets up the hardware mode, channel, rates, and passive scanning
 * based on the configuration.
 */
int hostapd_select_hw_mode(struct hostapd_iface *iface)
{
	int i;

	if (iface->num_hw_features < 1)
		return -1;

	if ((iface->conf->hw_mode == HOSTAPD_MODE_IEEE80211G ||
	     iface->conf->ieee80211n || iface->conf->ieee80211ac) &&
	    iface->conf->channel == 14) {
		wpa_printf(MSG_INFO, "Disable OFDM/HT/VHT on channel 14");
		iface->conf->hw_mode = HOSTAPD_MODE_IEEE80211B;
		iface->conf->ieee80211n = 0;
		iface->conf->ieee80211ac = 0;
	}

	iface->current_mode = NULL;
	for (i = 0; i < iface->num_hw_features; i++) {
		struct hostapd_hw_modes *mode = &iface->hw_features[i];
		if (mode->mode == iface->conf->hw_mode) {
			iface->current_mode = mode;
			break;
		}
	}

	if (iface->current_mode == NULL) {
		if (!(iface->drv_flags & WPA_DRIVER_FLAGS_ACS_OFFLOAD) ||
		    !(iface->drv_flags & WPA_DRIVER_FLAGS_SUPPORT_HW_MODE_ANY))
		{
			wpa_printf(MSG_ERROR,
				   "Hardware does not support configured mode");
			hostapd_logger(iface->bss[0], NULL,
				       HOSTAPD_MODULE_IEEE80211,
				       HOSTAPD_LEVEL_WARNING,
				       "Hardware does not support configured mode (%d) (hw_mode in hostapd.conf)",
				       (int) iface->conf->hw_mode);
			return -2;
		}
	}

	switch (hostapd_check_chans(iface)) {
	case HOSTAPD_CHAN_VALID:
		return 0;
	case HOSTAPD_CHAN_ACS: /* ACS will run and later complete */
		return 1;
	case HOSTAPD_CHAN_INVALID:
	default:
		hostapd_notify_bad_chans(iface);
		return -3;
	}
}


const char * hostapd_hw_mode_txt(int mode)
{
	switch (mode) {
	case HOSTAPD_MODE_IEEE80211A:
		return "IEEE 802.11a";
	case HOSTAPD_MODE_IEEE80211B:
		return "IEEE 802.11b";
	case HOSTAPD_MODE_IEEE80211G:
		return "IEEE 802.11g";
	case HOSTAPD_MODE_IEEE80211AD:
		return "IEEE 802.11ad";
	default:
		return "UNKNOWN";
	}
}


int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan)
{
	return hw_get_freq(hapd->iface->current_mode, chan);
}


int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq)
{
	return hw_get_chan(hapd->iface->current_mode, freq);
}