aboutsummaryrefslogtreecommitdiffstats
path: root/src/common/ieee802_11_common.c
blob: b6bc449bf7dcd347041e30b510f197893765d0c2 (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
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
/*
 * IEEE 802.11 Common routines
 * Copyright (c) 2002-2015, Jouni Malinen <j@w1.fi>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */

#include "includes.h"

#include "common.h"
#include "defs.h"
#include "wpa_common.h"
#include "qca-vendor.h"
#include "ieee802_11_defs.h"
#include "ieee802_11_common.h"


static int ieee802_11_parse_vendor_specific(const u8 *pos, size_t elen,
					    struct ieee802_11_elems *elems,
					    int show_errors)
{
	unsigned int oui;

	/* first 3 bytes in vendor specific information element are the IEEE
	 * OUI of the vendor. The following byte is used a vendor specific
	 * sub-type. */
	if (elen < 4) {
		if (show_errors) {
			wpa_printf(MSG_MSGDUMP, "short vendor specific "
				   "information element ignored (len=%lu)",
				   (unsigned long) elen);
		}
		return -1;
	}

	oui = WPA_GET_BE24(pos);
	switch (oui) {
	case OUI_MICROSOFT:
		/* Microsoft/Wi-Fi information elements are further typed and
		 * subtyped */
		switch (pos[3]) {
		case 1:
			/* Microsoft OUI (00:50:F2) with OUI Type 1:
			 * real WPA information element */
			elems->wpa_ie = pos;
			elems->wpa_ie_len = elen;
			break;
		case WMM_OUI_TYPE:
			/* WMM information element */
			if (elen < 5) {
				wpa_printf(MSG_MSGDUMP, "short WMM "
					   "information element ignored "
					   "(len=%lu)",
					   (unsigned long) elen);
				return -1;
			}
			switch (pos[4]) {
			case WMM_OUI_SUBTYPE_INFORMATION_ELEMENT:
			case WMM_OUI_SUBTYPE_PARAMETER_ELEMENT:
				/*
				 * Share same pointer since only one of these
				 * is used and they start with same data.
				 * Length field can be used to distinguish the
				 * IEs.
				 */
				elems->wmm = pos;
				elems->wmm_len = elen;
				break;
			case WMM_OUI_SUBTYPE_TSPEC_ELEMENT:
				elems->wmm_tspec = pos;
				elems->wmm_tspec_len = elen;
				break;
			default:
				wpa_printf(MSG_EXCESSIVE, "unknown WMM "
					   "information element ignored "
					   "(subtype=%d len=%lu)",
					   pos[4], (unsigned long) elen);
				return -1;
			}
			break;
		case 4:
			/* Wi-Fi Protected Setup (WPS) IE */
			elems->wps_ie = pos;
			elems->wps_ie_len = elen;
			break;
		default:
			wpa_printf(MSG_EXCESSIVE, "Unknown Microsoft "
				   "information element ignored "
				   "(type=%d len=%lu)",
				   pos[3], (unsigned long) elen);
			return -1;
		}
		break;

	case OUI_WFA:
		switch (pos[3]) {
		case P2P_OUI_TYPE:
			/* Wi-Fi Alliance - P2P IE */
			elems->p2p = pos;
			elems->p2p_len = elen;
			break;
		case WFD_OUI_TYPE:
			/* Wi-Fi Alliance - WFD IE */
			elems->wfd = pos;
			elems->wfd_len = elen;
			break;
		case HS20_INDICATION_OUI_TYPE:
			/* Hotspot 2.0 */
			elems->hs20 = pos;
			elems->hs20_len = elen;
			break;
		case HS20_OSEN_OUI_TYPE:
			/* Hotspot 2.0 OSEN */
			elems->osen = pos;
			elems->osen_len = elen;
			break;
		case MBO_OUI_TYPE:
			/* MBO-OCE */
			elems->mbo = pos;
			elems->mbo_len = elen;
			break;
		default:
			wpa_printf(MSG_MSGDUMP, "Unknown WFA "
				   "information element ignored "
				   "(type=%d len=%lu)",
				   pos[3], (unsigned long) elen);
			return -1;
		}
		break;

	case OUI_BROADCOM:
		switch (pos[3]) {
		case VENDOR_HT_CAPAB_OUI_TYPE:
			elems->vendor_ht_cap = pos;
			elems->vendor_ht_cap_len = elen;
			break;
		case VENDOR_VHT_TYPE:
			if (elen > 4 &&
			    (pos[4] == VENDOR_VHT_SUBTYPE ||
			     pos[4] == VENDOR_VHT_SUBTYPE2)) {
				elems->vendor_vht = pos;
				elems->vendor_vht_len = elen;
			} else
				return -1;
			break;
		default:
			wpa_printf(MSG_EXCESSIVE, "Unknown Broadcom "
				   "information element ignored "
				   "(type=%d len=%lu)",
				   pos[3], (unsigned long) elen);
			return -1;
		}
		break;

	case OUI_QCA:
		switch (pos[3]) {
		case QCA_VENDOR_ELEM_P2P_PREF_CHAN_LIST:
			elems->pref_freq_list = pos;
			elems->pref_freq_list_len = elen;
			break;
		default:
			wpa_printf(MSG_EXCESSIVE,
				   "Unknown QCA information element ignored (type=%d len=%lu)",
				   pos[3], (unsigned long) elen);
			return -1;
		}
		break;

	default:
		wpa_printf(MSG_EXCESSIVE, "unknown vendor specific "
			   "information element ignored (vendor OUI "
			   "%02x:%02x:%02x len=%lu)",
			   pos[0], pos[1], pos[2], (unsigned long) elen);
		return -1;
	}

	return 0;
}


/**
 * ieee802_11_parse_elems - Parse information elements in management frames
 * @start: Pointer to the start of IEs
 * @len: Length of IE buffer in octets
 * @elems: Data structure for parsed elements
 * @show_errors: Whether to show parsing errors in debug log
 * Returns: Parsing result
 */
ParseRes ieee802_11_parse_elems(const u8 *start, size_t len,
				struct ieee802_11_elems *elems,
				int show_errors)
{
	size_t left = len;
	const u8 *pos = start;
	int unknown = 0;

	os_memset(elems, 0, sizeof(*elems));

	while (left >= 2) {
		u8 id, elen;

		id = *pos++;
		elen = *pos++;
		left -= 2;

		if (elen > left) {
			if (show_errors) {
				wpa_printf(MSG_DEBUG, "IEEE 802.11 element "
					   "parse failed (id=%d elen=%d "
					   "left=%lu)",
					   id, elen, (unsigned long) left);
				wpa_hexdump(MSG_MSGDUMP, "IEs", start, len);
			}
			return ParseFailed;
		}

		switch (id) {
		case WLAN_EID_SSID:
			if (elen > SSID_MAX_LEN) {
				wpa_printf(MSG_DEBUG,
					   "Ignored too long SSID element (elen=%u)",
					   elen);
				break;
			}
			elems->ssid = pos;
			elems->ssid_len = elen;
			break;
		case WLAN_EID_SUPP_RATES:
			elems->supp_rates = pos;
			elems->supp_rates_len = elen;
			break;
		case WLAN_EID_DS_PARAMS:
			if (elen < 1)
				break;
			elems->ds_params = pos;
			break;
		case WLAN_EID_CF_PARAMS:
		case WLAN_EID_TIM:
			break;
		case WLAN_EID_CHALLENGE:
			elems->challenge = pos;
			elems->challenge_len = elen;
			break;
		case WLAN_EID_ERP_INFO:
			if (elen < 1)
				break;
			elems->erp_info = pos;
			break;
		case WLAN_EID_EXT_SUPP_RATES:
			elems->ext_supp_rates = pos;
			elems->ext_supp_rates_len = elen;
			break;
		case WLAN_EID_VENDOR_SPECIFIC:
			if (ieee802_11_parse_vendor_specific(pos, elen,
							     elems,
							     show_errors))
				unknown++;
			break;
		case WLAN_EID_RSN:
			elems->rsn_ie = pos;
			elems->rsn_ie_len = elen;
			break;
		case WLAN_EID_PWR_CAPABILITY:
			break;
		case WLAN_EID_SUPPORTED_CHANNELS:
			elems->supp_channels = pos;
			elems->supp_channels_len = elen;
			break;
		case WLAN_EID_MOBILITY_DOMAIN:
			if (elen < sizeof(struct rsn_mdie))
				break;
			elems->mdie = pos;
			elems->mdie_len = elen;
			break;
		case WLAN_EID_FAST_BSS_TRANSITION:
			if (elen < sizeof(struct rsn_ftie))
				break;
			elems->ftie = pos;
			elems->ftie_len = elen;
			break;
		case WLAN_EID_TIMEOUT_INTERVAL:
			if (elen != 5)
				break;
			elems->timeout_int = pos;
			break;
		case WLAN_EID_HT_CAP:
			if (elen < sizeof(struct ieee80211_ht_capabilities))
				break;
			elems->ht_capabilities = pos;
			break;
		case WLAN_EID_HT_OPERATION:
			if (elen < sizeof(struct ieee80211_ht_operation))
				break;
			elems->ht_operation = pos;
			break;
		case WLAN_EID_MESH_CONFIG:
			elems->mesh_config = pos;
			elems->mesh_config_len = elen;
			break;
		case WLAN_EID_MESH_ID:
			elems->mesh_id = pos;
			elems->mesh_id_len = elen;
			break;
		case WLAN_EID_PEER_MGMT:
			elems->peer_mgmt = pos;
			elems->peer_mgmt_len = elen;
			break;
		case WLAN_EID_VHT_CAP:
			if (elen < sizeof(struct ieee80211_vht_capabilities))
				break;
			elems->vht_capabilities = pos;
			break;
		case WLAN_EID_VHT_OPERATION:
			if (elen < sizeof(struct ieee80211_vht_operation))
				break;
			elems->vht_operation = pos;
			break;
		case WLAN_EID_VHT_OPERATING_MODE_NOTIFICATION:
			if (elen != 1)
				break;
			elems->vht_opmode_notif = pos;
			break;
		case WLAN_EID_LINK_ID:
			if (elen < 18)
				break;
			elems->link_id = pos;
			break;
		case WLAN_EID_INTERWORKING:
			elems->interworking = pos;
			elems->interworking_len = elen;
			break;
		case WLAN_EID_QOS_MAP_SET:
			if (elen < 16)
				break;
			elems->qos_map_set = pos;
			elems->qos_map_set_len = elen;
			break;
		case WLAN_EID_EXT_CAPAB:
			elems->ext_capab = pos;
			elems->ext_capab_len = elen;
			break;
		case WLAN_EID_BSS_MAX_IDLE_PERIOD:
			if (elen < 3)
				break;
			elems->bss_max_idle_period = pos;
			break;
		case WLAN_EID_SSID_LIST:
			elems->ssid_list = pos;
			elems->ssid_list_len = elen;
			break;
		case WLAN_EID_AMPE:
			elems->ampe = pos;
			elems->ampe_len = elen;
			break;
		case WLAN_EID_MIC:
			elems->mic = pos;
			elems->mic_len = elen;
			/* after mic everything is encrypted, so stop. */
			left = elen;
			break;
		case WLAN_EID_MULTI_BAND:
			if (elems->mb_ies.nof_ies >= MAX_NOF_MB_IES_SUPPORTED) {
				wpa_printf(MSG_MSGDUMP,
					   "IEEE 802.11 element parse ignored MB IE (id=%d elen=%d)",
					   id, elen);
				break;
			}

			elems->mb_ies.ies[elems->mb_ies.nof_ies].ie = pos;
			elems->mb_ies.ies[elems->mb_ies.nof_ies].ie_len = elen;
			elems->mb_ies.nof_ies++;
			break;
		case WLAN_EID_SUPPORTED_OPERATING_CLASSES:
			elems->supp_op_classes = pos;
			elems->supp_op_classes_len = elen;
			break;
		case WLAN_EID_RRM_ENABLED_CAPABILITIES:
			elems->rrm_enabled = pos;
			elems->rrm_enabled_len = elen;
			break;
		default:
			unknown++;
			if (!show_errors)
				break;
			wpa_printf(MSG_MSGDUMP, "IEEE 802.11 element parse "
				   "ignored unknown element (id=%d elen=%d)",
				   id, elen);
			break;
		}

		left -= elen;
		pos += elen;
	}

	if (left)
		return ParseFailed;

	return unknown ? ParseUnknown : ParseOK;
}


int ieee802_11_ie_count(const u8 *ies, size_t ies_len)
{
	int count = 0;
	const u8 *pos, *end;

	if (ies == NULL)
		return 0;

	pos = ies;
	end = ies + ies_len;

	while (end - pos >= 2) {
		if (2 + pos[1] > end - pos)
			break;
		count++;
		pos += 2 + pos[1];
	}

	return count;
}


struct wpabuf * ieee802_11_vendor_ie_concat(const u8 *ies, size_t ies_len,
					    u32 oui_type)
{
	struct wpabuf *buf;
	const u8 *end, *pos, *ie;

	pos = ies;
	end = ies + ies_len;
	ie = NULL;

	while (end - pos > 1) {
		if (2 + pos[1] > end - pos)
			return NULL;
		if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
		    WPA_GET_BE32(&pos[2]) == oui_type) {
			ie = pos;
			break;
		}
		pos += 2 + pos[1];
	}

	if (ie == NULL)
		return NULL; /* No specified vendor IE found */

	buf = wpabuf_alloc(ies_len);
	if (buf == NULL)
		return NULL;

	/*
	 * There may be multiple vendor IEs in the message, so need to
	 * concatenate their data fields.
	 */
	while (end - pos > 1) {
		if (2 + pos[1] > end - pos)
			break;
		if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
		    WPA_GET_BE32(&pos[2]) == oui_type)
			wpabuf_put_data(buf, pos + 6, pos[1] - 4);
		pos += 2 + pos[1];
	}

	return buf;
}


const u8 * get_hdr_bssid(const struct ieee80211_hdr *hdr, size_t len)
{
	u16 fc, type, stype;

	/*
	 * PS-Poll frames are 16 bytes. All other frames are
	 * 24 bytes or longer.
	 */
	if (len < 16)
		return NULL;

	fc = le_to_host16(hdr->frame_control);
	type = WLAN_FC_GET_TYPE(fc);
	stype = WLAN_FC_GET_STYPE(fc);

	switch (type) {
	case WLAN_FC_TYPE_DATA:
		if (len < 24)
			return NULL;
		switch (fc & (WLAN_FC_FROMDS | WLAN_FC_TODS)) {
		case WLAN_FC_FROMDS | WLAN_FC_TODS:
		case WLAN_FC_TODS:
			return hdr->addr1;
		case WLAN_FC_FROMDS:
			return hdr->addr2;
		default:
			return NULL;
		}
	case WLAN_FC_TYPE_CTRL:
		if (stype != WLAN_FC_STYPE_PSPOLL)
			return NULL;
		return hdr->addr1;
	case WLAN_FC_TYPE_MGMT:
		return hdr->addr3;
	default:
		return NULL;
	}
}


int hostapd_config_wmm_ac(struct hostapd_wmm_ac_params wmm_ac_params[],
			  const char *name, const char *val)
{
	int num, v;
	const char *pos;
	struct hostapd_wmm_ac_params *ac;

	/* skip 'wme_ac_' or 'wmm_ac_' prefix */
	pos = name + 7;
	if (os_strncmp(pos, "be_", 3) == 0) {
		num = 0;
		pos += 3;
	} else if (os_strncmp(pos, "bk_", 3) == 0) {
		num = 1;
		pos += 3;
	} else if (os_strncmp(pos, "vi_", 3) == 0) {
		num = 2;
		pos += 3;
	} else if (os_strncmp(pos, "vo_", 3) == 0) {
		num = 3;
		pos += 3;
	} else {
		wpa_printf(MSG_ERROR, "Unknown WMM name '%s'", pos);
		return -1;
	}

	ac = &wmm_ac_params[num];

	if (os_strcmp(pos, "aifs") == 0) {
		v = atoi(val);
		if (v < 1 || v > 255) {
			wpa_printf(MSG_ERROR, "Invalid AIFS value %d", v);
			return -1;
		}
		ac->aifs = v;
	} else if (os_strcmp(pos, "cwmin") == 0) {
		v = atoi(val);
		if (v < 0 || v > 15) {
			wpa_printf(MSG_ERROR, "Invalid cwMin value %d", v);
			return -1;
		}
		ac->cwmin = v;
	} else if (os_strcmp(pos, "cwmax") == 0) {
		v = atoi(val);
		if (v < 0 || v > 15) {
			wpa_printf(MSG_ERROR, "Invalid cwMax value %d", v);
			return -1;
		}
		ac->cwmax = v;
	} else if (os_strcmp(pos, "txop_limit") == 0) {
		v = atoi(val);
		if (v < 0 || v > 0xffff) {
			wpa_printf(MSG_ERROR, "Invalid txop value %d", v);
			return -1;
		}
		ac->txop_limit = v;
	} else if (os_strcmp(pos, "acm") == 0) {
		v = atoi(val);
		if (v < 0 || v > 1) {
			wpa_printf(MSG_ERROR, "Invalid acm value %d", v);
			return -1;
		}
		ac->admission_control_mandatory = v;
	} else {
		wpa_printf(MSG_ERROR, "Unknown wmm_ac_ field '%s'", pos);
		return -1;
	}

	return 0;
}


enum hostapd_hw_mode ieee80211_freq_to_chan(int freq, u8 *channel)
{
	u8 op_class;

	return ieee80211_freq_to_channel_ext(freq, 0, VHT_CHANWIDTH_USE_HT,
					     &op_class, channel);
}


/**
 * ieee80211_freq_to_channel_ext - Convert frequency into channel info
 * for HT40 and VHT. DFS channels are not covered.
 * @freq: Frequency (MHz) to convert
 * @sec_channel: 0 = non-HT40, 1 = sec. channel above, -1 = sec. channel below
 * @vht: VHT channel width (VHT_CHANWIDTH_*)
 * @op_class: Buffer for returning operating class
 * @channel: Buffer for returning channel number
 * Returns: hw_mode on success, NUM_HOSTAPD_MODES on failure
 */
enum hostapd_hw_mode ieee80211_freq_to_channel_ext(unsigned int freq,
						   int sec_channel, int vht,
						   u8 *op_class, u8 *channel)
{
	u8 vht_opclass;

	/* TODO: more operating classes */

	if (sec_channel > 1 || sec_channel < -1)
		return NUM_HOSTAPD_MODES;

	if (freq >= 2412 && freq <= 2472) {
		if ((freq - 2407) % 5)
			return NUM_HOSTAPD_MODES;

		if (vht)
			return NUM_HOSTAPD_MODES;

		/* 2.407 GHz, channels 1..13 */
		if (sec_channel == 1)
			*op_class = 83;
		else if (sec_channel == -1)
			*op_class = 84;
		else
			*op_class = 81;

		*channel = (freq - 2407) / 5;

		return HOSTAPD_MODE_IEEE80211G;
	}

	if (freq == 2484) {
		if (sec_channel || vht)
			return NUM_HOSTAPD_MODES;

		*op_class = 82; /* channel 14 */
		*channel = 14;

		return HOSTAPD_MODE_IEEE80211B;
	}

	if (freq >= 4900 && freq < 5000) {
		if ((freq - 4000) % 5)
			return NUM_HOSTAPD_MODES;
		*channel = (freq - 4000) / 5;
		*op_class = 0; /* TODO */
		return HOSTAPD_MODE_IEEE80211A;
	}

	switch (vht) {
	case VHT_CHANWIDTH_80MHZ:
		vht_opclass = 128;
		break;
	case VHT_CHANWIDTH_160MHZ:
		vht_opclass = 129;
		break;
	case VHT_CHANWIDTH_80P80MHZ:
		vht_opclass = 130;
		break;
	default:
		vht_opclass = 0;
		break;
	}

	/* 5 GHz, channels 36..48 */
	if (freq >= 5180 && freq <= 5240) {
		if ((freq - 5000) % 5)
			return NUM_HOSTAPD_MODES;

		if (vht_opclass)
			*op_class = vht_opclass;
		else if (sec_channel == 1)
			*op_class = 116;
		else if (sec_channel == -1)
			*op_class = 117;
		else
			*op_class = 115;

		*channel = (freq - 5000) / 5;

		return HOSTAPD_MODE_IEEE80211A;
	}

	/* 5 GHz, channels 149..169 */
	if (freq >= 5745 && freq <= 5845) {
		if ((freq - 5000) % 5)
			return NUM_HOSTAPD_MODES;

		if (vht_opclass)
			*op_class = vht_opclass;
		else if (sec_channel == 1)
			*op_class = 126;
		else if (sec_channel == -1)
			*op_class = 127;
		else if (freq <= 5805)
			*op_class = 124;
		else
			*op_class = 125;

		*channel = (freq - 5000) / 5;

		return HOSTAPD_MODE_IEEE80211A;
	}

	/* 5 GHz, channels 100..140 */
	if (freq >= 5000 && freq <= 5700) {
		if ((freq - 5000) % 5)
			return NUM_HOSTAPD_MODES;

		if (vht_opclass)
			*op_class = vht_opclass;
		else if (sec_channel == 1)
			*op_class = 122;
		else if (sec_channel == -1)
			*op_class = 123;
		else
			*op_class = 121;

		*channel = (freq - 5000) / 5;

		return HOSTAPD_MODE_IEEE80211A;
	}

	if (freq >= 5000 && freq < 5900) {
		if ((freq - 5000) % 5)
			return NUM_HOSTAPD_MODES;
		*channel = (freq - 5000) / 5;
		*op_class = 0; /* TODO */
		return HOSTAPD_MODE_IEEE80211A;
	}

	/* 56.16 GHz, channel 1..4 */
	if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 4) {
		if (sec_channel || vht)
			return NUM_HOSTAPD_MODES;

		*channel = (freq - 56160) / 2160;
		*op_class = 180;

		return HOSTAPD_MODE_IEEE80211AD;
	}

	return NUM_HOSTAPD_MODES;
}


static const char *const us_op_class_cc[] = {
	"US", "CA", NULL
};

static const char *const eu_op_class_cc[] = {
	"AL", "AM", "AT", "AZ", "BA", "BE", "BG", "BY", "CH", "CY", "CZ", "DE",
	"DK", "EE", "EL", "ES", "FI", "FR", "GE", "HR", "HU", "IE", "IS", "IT",
	"LI", "LT", "LU", "LV", "MD", "ME", "MK", "MT", "NL", "NO", "PL", "PT",
	"RO", "RS", "RU", "SE", "SI", "SK", "TR", "UA", "UK", NULL
};

static const char *const jp_op_class_cc[] = {
	"JP", NULL
};

static const char *const cn_op_class_cc[] = {
	"CN", NULL
};


static int country_match(const char *const cc[], const char *const country)
{
	int i;

	if (country == NULL)
		return 0;
	for (i = 0; cc[i]; i++) {
		if (cc[i][0] == country[0] && cc[i][1] == country[1])
			return 1;
	}

	return 0;
}


static int ieee80211_chan_to_freq_us(u8 op_class, u8 chan)
{
	switch (op_class) {
	case 12: /* channels 1..11 */
	case 32: /* channels 1..7; 40 MHz */
	case 33: /* channels 5..11; 40 MHz */
		if (chan < 1 || chan > 11)
			return -1;
		return 2407 + 5 * chan;
	case 1: /* channels 36,40,44,48 */
	case 2: /* channels 52,56,60,64; dfs */
	case 22: /* channels 36,44; 40 MHz */
	case 23: /* channels 52,60; 40 MHz */
	case 27: /* channels 40,48; 40 MHz */
	case 28: /* channels 56,64; 40 MHz */
		if (chan < 36 || chan > 64)
			return -1;
		return 5000 + 5 * chan;
	case 4: /* channels 100-144 */
	case 24: /* channels 100-140; 40 MHz */
		if (chan < 100 || chan > 144)
			return -1;
		return 5000 + 5 * chan;
	case 3: /* channels 149,153,157,161 */
	case 25: /* channels 149,157; 40 MHz */
	case 26: /* channels 149,157; 40 MHz */
	case 30: /* channels 153,161; 40 MHz */
	case 31: /* channels 153,161; 40 MHz */
		if (chan < 149 || chan > 161)
			return -1;
		return 5000 + 5 * chan;
	case 5: /* channels 149,153,157,161,165 */
		if (chan < 149 || chan > 165)
			return -1;
		return 5000 + 5 * chan;
	case 34: /* 60 GHz band, channels 1..3 */
		if (chan < 1 || chan > 3)
			return -1;
		return 56160 + 2160 * chan;
	}
	return -1;
}


static int ieee80211_chan_to_freq_eu(u8 op_class, u8 chan)
{
	switch (op_class) {
	case 4: /* channels 1..13 */
	case 11: /* channels 1..9; 40 MHz */
	case 12: /* channels 5..13; 40 MHz */
		if (chan < 1 || chan > 13)
			return -1;
		return 2407 + 5 * chan;
	case 1: /* channels 36,40,44,48 */
	case 2: /* channels 52,56,60,64; dfs */
	case 5: /* channels 36,44; 40 MHz */
	case 6: /* channels 52,60; 40 MHz */
	case 8: /* channels 40,48; 40 MHz */
	case 9: /* channels 56,64; 40 MHz */
		if (chan < 36 || chan > 64)
			return -1;
		return 5000 + 5 * chan;
	case 3: /* channels 100-140 */
	case 7: /* channels 100-132; 40 MHz */
	case 10: /* channels 104-136; 40 MHz */
	case 16: /* channels 100-140 */
		if (chan < 100 || chan > 140)
			return -1;
		return 5000 + 5 * chan;
	case 17: /* channels 149,153,157,161,165,169 */
		if (chan < 149 || chan > 169)
			return -1;
		return 5000 + 5 * chan;
	case 18: /* 60 GHz band, channels 1..4 */
		if (chan < 1 || chan > 4)
			return -1;
		return 56160 + 2160 * chan;
	}
	return -1;
}


static int ieee80211_chan_to_freq_jp(u8 op_class, u8 chan)
{
	switch (op_class) {
	case 30: /* channels 1..13 */
	case 56: /* channels 1..9; 40 MHz */
	case 57: /* channels 5..13; 40 MHz */
		if (chan < 1 || chan > 13)
			return -1;
		return 2407 + 5 * chan;
	case 31: /* channel 14 */
		if (chan != 14)
			return -1;
		return 2414 + 5 * chan;
	case 1: /* channels 34,38,42,46(old) or 36,40,44,48 */
	case 32: /* channels 52,56,60,64 */
	case 33: /* channels 52,56,60,64 */
	case 36: /* channels 36,44; 40 MHz */
	case 37: /* channels 52,60; 40 MHz */
	case 38: /* channels 52,60; 40 MHz */
	case 41: /* channels 40,48; 40 MHz */
	case 42: /* channels 56,64; 40 MHz */
	case 43: /* channels 56,64; 40 MHz */
		if (chan < 34 || chan > 64)
			return -1;
		return 5000 + 5 * chan;
	case 34: /* channels 100-140 */
	case 35: /* channels 100-140 */
	case 39: /* channels 100-132; 40 MHz */
	case 40: /* channels 100-132; 40 MHz */
	case 44: /* channels 104-136; 40 MHz */
	case 45: /* channels 104-136; 40 MHz */
	case 58: /* channels 100-140 */
		if (chan < 100 || chan > 140)
			return -1;
		return 5000 + 5 * chan;
	case 59: /* 60 GHz band, channels 1..4 */
		if (chan < 1 || chan > 3)
			return -1;
		return 56160 + 2160 * chan;
	}
	return -1;
}


static int ieee80211_chan_to_freq_cn(u8 op_class, u8 chan)
{
	switch (op_class) {
	case 7: /* channels 1..13 */
	case 8: /* channels 1..9; 40 MHz */
	case 9: /* channels 5..13; 40 MHz */
		if (chan < 1 || chan > 13)
			return -1;
		return 2407 + 5 * chan;
	case 1: /* channels 36,40,44,48 */
	case 2: /* channels 52,56,60,64; dfs */
	case 4: /* channels 36,44; 40 MHz */
	case 5: /* channels 52,60; 40 MHz */
		if (chan < 36 || chan > 64)
			return -1;
		return 5000 + 5 * chan;
	case 3: /* channels 149,153,157,161,165 */
	case 6: /* channels 149,157; 40 MHz */
		if (chan < 149 || chan > 165)
			return -1;
		return 5000 + 5 * chan;
	}
	return -1;
}


static int ieee80211_chan_to_freq_global(u8 op_class, u8 chan)
{
	/* Table E-4 in IEEE Std 802.11-2012 - Global operating classes */
	switch (op_class) {
	case 81:
		/* channels 1..13 */
		if (chan < 1 || chan > 13)
			return -1;
		return 2407 + 5 * chan;
	case 82:
		/* channel 14 */
		if (chan != 14)
			return -1;
		return 2414 + 5 * chan;
	case 83: /* channels 1..9; 40 MHz */
	case 84: /* channels 5..13; 40 MHz */
		if (chan < 1 || chan > 13)
			return -1;
		return 2407 + 5 * chan;
	case 115: /* channels 36,40,44,48; indoor only */
	case 116: /* channels 36,44; 40 MHz; indoor only */
	case 117: /* channels 40,48; 40 MHz; indoor only */
	case 118: /* channels 52,56,60,64; dfs */
	case 119: /* channels 52,60; 40 MHz; dfs */
	case 120: /* channels 56,64; 40 MHz; dfs */
		if (chan < 36 || chan > 64)
			return -1;
		return 5000 + 5 * chan;
	case 121: /* channels 100-140 */
	case 122: /* channels 100-142; 40 MHz */
	case 123: /* channels 104-136; 40 MHz */
		if (chan < 100 || chan > 140)
			return -1;
		return 5000 + 5 * chan;
	case 124: /* channels 149,153,157,161 */
	case 126: /* channels 149,157; 40 MHz */
	case 127: /* channels 153,161; 40 MHz */
		if (chan < 149 || chan > 161)
			return -1;
		return 5000 + 5 * chan;
	case 125: /* channels 149,153,157,161,165,169 */
		if (chan < 149 || chan > 169)
			return -1;
		return 5000 + 5 * chan;
	case 128: /* center freqs 42, 58, 106, 122, 138, 155; 80 MHz */
	case 130: /* center freqs 42, 58, 106, 122, 138, 155; 80 MHz */
		if (chan < 36 || chan > 161)
			return -1;
		return 5000 + 5 * chan;
	case 129: /* center freqs 50, 114; 160 MHz */
		if (chan < 50 || chan > 114)
			return -1;
		return 5000 + 5 * chan;
	case 180: /* 60 GHz band, channels 1..4 */
		if (chan < 1 || chan > 4)
			return -1;
		return 56160 + 2160 * chan;
	}
	return -1;
}

/**
 * ieee80211_chan_to_freq - Convert channel info to frequency
 * @country: Country code, if known; otherwise, global operating class is used
 * @op_class: Operating class
 * @chan: Channel number
 * Returns: Frequency in MHz or -1 if the specified channel is unknown
 */
int ieee80211_chan_to_freq(const char *country, u8 op_class, u8 chan)
{
	int freq;

	if (country_match(us_op_class_cc, country)) {
		freq = ieee80211_chan_to_freq_us(op_class, chan);
		if (freq > 0)
			return freq;
	}

	if (country_match(eu_op_class_cc, country)) {
		freq = ieee80211_chan_to_freq_eu(op_class, chan);
		if (freq > 0)
			return freq;
	}

	if (country_match(jp_op_class_cc, country)) {
		freq = ieee80211_chan_to_freq_jp(op_class, chan);
		if (freq > 0)
			return freq;
	}

	if (country_match(cn_op_class_cc, country)) {
		freq = ieee80211_chan_to_freq_cn(op_class, chan);
		if (freq > 0)
			return freq;
	}

	return ieee80211_chan_to_freq_global(op_class, chan);
}


int ieee80211_is_dfs(int freq)
{
	/* TODO: this could be more accurate to better cover all domains */
	return (freq >= 5260 && freq <= 5320) || (freq >= 5500 && freq <= 5700);
}


static int is_11b(u8 rate)
{
	return rate == 0x02 || rate == 0x04 || rate == 0x0b || rate == 0x16;
}


int supp_rates_11b_only(struct ieee802_11_elems *elems)
{
	int num_11b = 0, num_others = 0;
	int i;

	if (elems->supp_rates == NULL && elems->ext_supp_rates == NULL)
		return 0;

	for (i = 0; elems->supp_rates && i < elems->supp_rates_len; i++) {
		if (is_11b(elems->supp_rates[i]))
			num_11b++;
		else
			num_others++;
	}

	for (i = 0; elems->ext_supp_rates && i < elems->ext_supp_rates_len;
	     i++) {
		if (is_11b(elems->ext_supp_rates[i]))
			num_11b++;
		else
			num_others++;
	}

	return num_11b > 0 && num_others == 0;
}


const char * fc2str(u16 fc)
{
	u16 stype = WLAN_FC_GET_STYPE(fc);
#define C2S(x) case x: return #x;

	switch (WLAN_FC_GET_TYPE(fc)) {
	case WLAN_FC_TYPE_MGMT:
		switch (stype) {
		C2S(WLAN_FC_STYPE_ASSOC_REQ)
		C2S(WLAN_FC_STYPE_ASSOC_RESP)
		C2S(WLAN_FC_STYPE_REASSOC_REQ)
		C2S(WLAN_FC_STYPE_REASSOC_RESP)
		C2S(WLAN_FC_STYPE_PROBE_REQ)
		C2S(WLAN_FC_STYPE_PROBE_RESP)
		C2S(WLAN_FC_STYPE_BEACON)
		C2S(WLAN_FC_STYPE_ATIM)
		C2S(WLAN_FC_STYPE_DISASSOC)
		C2S(WLAN_FC_STYPE_AUTH)
		C2S(WLAN_FC_STYPE_DEAUTH)
		C2S(WLAN_FC_STYPE_ACTION)
		}
		break;
	case WLAN_FC_TYPE_CTRL:
		switch (stype) {
		C2S(WLAN_FC_STYPE_PSPOLL)
		C2S(WLAN_FC_STYPE_RTS)
		C2S(WLAN_FC_STYPE_CTS)
		C2S(WLAN_FC_STYPE_ACK)
		C2S(WLAN_FC_STYPE_CFEND)
		C2S(WLAN_FC_STYPE_CFENDACK)
		}
		break;
	case WLAN_FC_TYPE_DATA:
		switch (stype) {
		C2S(WLAN_FC_STYPE_DATA)
		C2S(WLAN_FC_STYPE_DATA_CFACK)
		C2S(WLAN_FC_STYPE_DATA_CFPOLL)
		C2S(WLAN_FC_STYPE_DATA_CFACKPOLL)
		C2S(WLAN_FC_STYPE_NULLFUNC)
		C2S(WLAN_FC_STYPE_CFACK)
		C2S(WLAN_FC_STYPE_CFPOLL)
		C2S(WLAN_FC_STYPE_CFACKPOLL)
		C2S(WLAN_FC_STYPE_QOS_DATA)
		C2S(WLAN_FC_STYPE_QOS_DATA_CFACK)
		C2S(WLAN_FC_STYPE_QOS_DATA_CFPOLL)
		C2S(WLAN_FC_STYPE_QOS_DATA_CFACKPOLL)
		C2S(WLAN_FC_STYPE_QOS_NULL)
		C2S(WLAN_FC_STYPE_QOS_CFPOLL)
		C2S(WLAN_FC_STYPE_QOS_CFACKPOLL)
		}
		break;
	}
	return "WLAN_FC_TYPE_UNKNOWN";
#undef C2S
}


int mb_ies_info_by_ies(struct mb_ies_info *info, const u8 *ies_buf,
		       size_t ies_len)
{
	os_memset(info, 0, sizeof(*info));

	while (ies_buf && ies_len >= 2 &&
	       info->nof_ies < MAX_NOF_MB_IES_SUPPORTED) {
		size_t len = 2 + ies_buf[1];

		if (len > ies_len) {
			wpa_hexdump(MSG_DEBUG, "Truncated IEs",
				    ies_buf, ies_len);
			return -1;
		}

		if (ies_buf[0] == WLAN_EID_MULTI_BAND) {
			wpa_printf(MSG_DEBUG, "MB IE of %zu bytes found", len);
			info->ies[info->nof_ies].ie = ies_buf + 2;
			info->ies[info->nof_ies].ie_len = ies_buf[1];
			info->nof_ies++;
		}

		ies_len -= len;
		ies_buf += len;
	}

	return 0;
}


struct wpabuf * mb_ies_by_info(struct mb_ies_info *info)
{
	struct wpabuf *mb_ies = NULL;

	WPA_ASSERT(info != NULL);

	if (info->nof_ies) {
		u8 i;
		size_t mb_ies_size = 0;

		for (i = 0; i < info->nof_ies; i++)
			mb_ies_size += 2 + info->ies[i].ie_len;

		mb_ies = wpabuf_alloc(mb_ies_size);
		if (mb_ies) {
			for (i = 0; i < info->nof_ies; i++) {
				wpabuf_put_u8(mb_ies, WLAN_EID_MULTI_BAND);
				wpabuf_put_u8(mb_ies, info->ies[i].ie_len);
				wpabuf_put_data(mb_ies,
						info->ies[i].ie,
						info->ies[i].ie_len);
			}
		}
	}

	return mb_ies;
}


const struct oper_class_map global_op_class[] = {
	{ HOSTAPD_MODE_IEEE80211G, 81, 1, 13, 1, BW20, P2P_SUPP },
	{ HOSTAPD_MODE_IEEE80211G, 82, 14, 14, 1, BW20, NO_P2P_SUPP },

	/* Do not enable HT40 on 2.4 GHz for P2P use for now */
	{ HOSTAPD_MODE_IEEE80211G, 83, 1, 9, 1, BW40PLUS, NO_P2P_SUPP },
	{ HOSTAPD_MODE_IEEE80211G, 84, 5, 13, 1, BW40MINUS, NO_P2P_SUPP },

	{ HOSTAPD_MODE_IEEE80211A, 115, 36, 48, 4, BW20, P2P_SUPP },
	{ HOSTAPD_MODE_IEEE80211A, 116, 36, 44, 8, BW40PLUS, P2P_SUPP },
	{ HOSTAPD_MODE_IEEE80211A, 117, 40, 48, 8, BW40MINUS, P2P_SUPP },
	{ HOSTAPD_MODE_IEEE80211A, 118, 52, 64, 4, BW20, NO_P2P_SUPP },
	{ HOSTAPD_MODE_IEEE80211A, 119, 52, 60, 8, BW40PLUS, NO_P2P_SUPP },
	{ HOSTAPD_MODE_IEEE80211A, 120, 56, 64, 8, BW40MINUS, NO_P2P_SUPP },
	{ HOSTAPD_MODE_IEEE80211A, 121, 100, 140, 4, BW20, NO_P2P_SUPP },
	{ HOSTAPD_MODE_IEEE80211A, 122, 100, 132, 8, BW40PLUS, NO_P2P_SUPP },
	{ HOSTAPD_MODE_IEEE80211A, 123, 104, 136, 8, BW40MINUS, NO_P2P_SUPP },
	{ HOSTAPD_MODE_IEEE80211A, 124, 149, 161, 4, BW20, P2P_SUPP },
	{ HOSTAPD_MODE_IEEE80211A, 125, 149, 169, 4, BW20, P2P_SUPP },
	{ HOSTAPD_MODE_IEEE80211A, 126, 149, 157, 8, BW40PLUS, P2P_SUPP },
	{ HOSTAPD_MODE_IEEE80211A, 127, 153, 161, 8, BW40MINUS, P2P_SUPP },

	/*
	 * IEEE P802.11ac/D7.0 Table E-4 actually talks about channel center
	 * frequency index 42, 58, 106, 122, 138, 155 with channel spacing of
	 * 80 MHz, but currently use the following definition for simplicity
	 * (these center frequencies are not actual channels, which makes
	 * wpas_p2p_allow_channel() fail). wpas_p2p_verify_80mhz() should take
	 * care of removing invalid channels.
	 */
	{ HOSTAPD_MODE_IEEE80211A, 128, 36, 161, 4, BW80, P2P_SUPP },
	{ HOSTAPD_MODE_IEEE80211A, 129, 50, 114, 16, BW160, P2P_SUPP },
	{ HOSTAPD_MODE_IEEE80211A, 130, 36, 161, 4, BW80P80, P2P_SUPP },
	{ HOSTAPD_MODE_IEEE80211AD, 180, 1, 4, 1, BW2160, P2P_SUPP },
	{ -1, 0, 0, 0, 0, BW20, NO_P2P_SUPP }
};


static enum phy_type ieee80211_phy_type_by_freq(int freq)
{
	enum hostapd_hw_mode hw_mode;
	u8 channel;

	hw_mode = ieee80211_freq_to_chan(freq, &channel);

	switch (hw_mode) {
	case HOSTAPD_MODE_IEEE80211A:
		return PHY_TYPE_OFDM;
	case HOSTAPD_MODE_IEEE80211B:
		return PHY_TYPE_HRDSSS;
	case HOSTAPD_MODE_IEEE80211G:
		return PHY_TYPE_ERP;
	case HOSTAPD_MODE_IEEE80211AD:
		return PHY_TYPE_DMG;
	default:
		return PHY_TYPE_UNSPECIFIED;
	};
}


/* ieee80211_get_phy_type - Derive the phy type by freq and bandwidth */
enum phy_type ieee80211_get_phy_type(int freq, int ht, int vht)
{
	if (vht)
		return PHY_TYPE_VHT;
	if (ht)
		return PHY_TYPE_HT;

	return ieee80211_phy_type_by_freq(freq);
}


size_t global_op_class_size = ARRAY_SIZE(global_op_class);


/**
 * get_ie - Fetch a specified information element from IEs buffer
 * @ies: Information elements buffer
 * @len: Information elements buffer length
 * @eid: Information element identifier (WLAN_EID_*)
 * Returns: Pointer to the information element (id field) or %NULL if not found
 *
 * This function returns the first matching information element in the IEs
 * buffer or %NULL in case the element is not found.
 */
const u8 * get_ie(const u8 *ies, size_t len, u8 eid)
{
	const u8 *end;

	if (!ies)
		return NULL;

	end = ies + len;

	while (end - ies > 1) {
		if (2 + ies[1] > end - ies)
			break;

		if (ies[0] == eid)
			return ies;

		ies += 2 + ies[1];
	}

	return NULL;
}


size_t mbo_add_ie(u8 *buf, size_t len, const u8 *attr, size_t attr_len)
{
	/*
	 * MBO IE requires 6 bytes without the attributes: EID (1), length (1),
	 * OUI (3), OUI type (1).
	 */
	if (len < 6 + attr_len) {
		wpa_printf(MSG_DEBUG,
			   "MBO: Not enough room in buffer for MBO IE: buf len = %zu, attr_len = %zu",
			   len, attr_len);
		return 0;
	}

	*buf++ = WLAN_EID_VENDOR_SPECIFIC;
	*buf++ = attr_len + 4;
	WPA_PUT_BE24(buf, OUI_WFA);
	buf += 3;
	*buf++ = MBO_OUI_TYPE;
	os_memcpy(buf, attr, attr_len);

	return 6 + attr_len;
}