aboutsummaryrefslogtreecommitdiffstats
path: root/wpa_supplicant/bss.c
blob: e4bde6e5ded213d2e6e864871c04a3a3c0b3bdc1 (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
/*
 * BSS table
 * Copyright (c) 2009-2015, 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 "drivers/driver.h"
#include "wpa_supplicant_i.h"
#include "config.h"
#include "notify.h"
#include "scan.h"
#include "bss.h"


#define WPA_BSS_FREQ_CHANGED_FLAG	BIT(0)
#define WPA_BSS_SIGNAL_CHANGED_FLAG	BIT(1)
#define WPA_BSS_PRIVACY_CHANGED_FLAG	BIT(2)
#define WPA_BSS_MODE_CHANGED_FLAG	BIT(3)
#define WPA_BSS_WPAIE_CHANGED_FLAG	BIT(4)
#define WPA_BSS_RSNIE_CHANGED_FLAG	BIT(5)
#define WPA_BSS_WPS_CHANGED_FLAG	BIT(6)
#define WPA_BSS_RATES_CHANGED_FLAG	BIT(7)
#define WPA_BSS_IES_CHANGED_FLAG	BIT(8)


static void wpa_bss_set_hessid(struct wpa_bss *bss)
{
#ifdef CONFIG_INTERWORKING
	const u8 *ie = wpa_bss_get_ie(bss, WLAN_EID_INTERWORKING);
	if (ie == NULL || (ie[1] != 7 && ie[1] != 9)) {
		os_memset(bss->hessid, 0, ETH_ALEN);
		return;
	}
	if (ie[1] == 7)
		os_memcpy(bss->hessid, ie + 3, ETH_ALEN);
	else
		os_memcpy(bss->hessid, ie + 5, ETH_ALEN);
#endif /* CONFIG_INTERWORKING */
}


/**
 * wpa_bss_anqp_alloc - Allocate ANQP data structure for a BSS entry
 * Returns: Allocated ANQP data structure or %NULL on failure
 *
 * The allocated ANQP data structure has its users count set to 1. It may be
 * shared by multiple BSS entries and each shared entry is freed with
 * wpa_bss_anqp_free().
 */
struct wpa_bss_anqp * wpa_bss_anqp_alloc(void)
{
	struct wpa_bss_anqp *anqp;
	anqp = os_zalloc(sizeof(*anqp));
	if (anqp == NULL)
		return NULL;
	anqp->users = 1;
	return anqp;
}


/**
 * wpa_bss_anqp_clone - Clone an ANQP data structure
 * @anqp: ANQP data structure from wpa_bss_anqp_alloc()
 * Returns: Cloned ANQP data structure or %NULL on failure
 */
static struct wpa_bss_anqp * wpa_bss_anqp_clone(struct wpa_bss_anqp *anqp)
{
	struct wpa_bss_anqp *n;

	n = os_zalloc(sizeof(*n));
	if (n == NULL)
		return NULL;

#define ANQP_DUP(f) if (anqp->f) n->f = wpabuf_dup(anqp->f)
#ifdef CONFIG_INTERWORKING
	ANQP_DUP(capability_list);
	ANQP_DUP(venue_name);
	ANQP_DUP(network_auth_type);
	ANQP_DUP(roaming_consortium);
	ANQP_DUP(ip_addr_type_availability);
	ANQP_DUP(nai_realm);
	ANQP_DUP(anqp_3gpp);
	ANQP_DUP(domain_name);
#endif /* CONFIG_INTERWORKING */
#ifdef CONFIG_HS20
	ANQP_DUP(hs20_capability_list);
	ANQP_DUP(hs20_operator_friendly_name);
	ANQP_DUP(hs20_wan_metrics);
	ANQP_DUP(hs20_connection_capability);
	ANQP_DUP(hs20_operating_class);
	ANQP_DUP(hs20_osu_providers_list);
#endif /* CONFIG_HS20 */
#undef ANQP_DUP

	return n;
}


/**
 * wpa_bss_anqp_unshare_alloc - Unshare ANQP data (if shared) in a BSS entry
 * @bss: BSS entry
 * Returns: 0 on success, -1 on failure
 *
 * This function ensures the specific BSS entry has an ANQP data structure that
 * is not shared with any other BSS entry.
 */
int wpa_bss_anqp_unshare_alloc(struct wpa_bss *bss)
{
	struct wpa_bss_anqp *anqp;

	if (bss->anqp && bss->anqp->users > 1) {
		/* allocated, but shared - clone an unshared copy */
		anqp = wpa_bss_anqp_clone(bss->anqp);
		if (anqp == NULL)
			return -1;
		anqp->users = 1;
		bss->anqp->users--;
		bss->anqp = anqp;
		return 0;
	}

	if (bss->anqp)
		return 0; /* already allocated and not shared */

	/* not allocated - allocate a new storage area */
	bss->anqp = wpa_bss_anqp_alloc();
	return bss->anqp ? 0 : -1;
}


/**
 * wpa_bss_anqp_free - Free an ANQP data structure
 * @anqp: ANQP data structure from wpa_bss_anqp_alloc() or wpa_bss_anqp_clone()
 */
static void wpa_bss_anqp_free(struct wpa_bss_anqp *anqp)
{
	if (anqp == NULL)
		return;

	anqp->users--;
	if (anqp->users > 0) {
		/* Another BSS entry holds a pointer to this ANQP info */
		return;
	}

#ifdef CONFIG_INTERWORKING
	wpabuf_free(anqp->capability_list);
	wpabuf_free(anqp->venue_name);
	wpabuf_free(anqp->network_auth_type);
	wpabuf_free(anqp->roaming_consortium);
	wpabuf_free(anqp->ip_addr_type_availability);
	wpabuf_free(anqp->nai_realm);
	wpabuf_free(anqp->anqp_3gpp);
	wpabuf_free(anqp->domain_name);
#endif /* CONFIG_INTERWORKING */
#ifdef CONFIG_HS20
	wpabuf_free(anqp->hs20_capability_list);
	wpabuf_free(anqp->hs20_operator_friendly_name);
	wpabuf_free(anqp->hs20_wan_metrics);
	wpabuf_free(anqp->hs20_connection_capability);
	wpabuf_free(anqp->hs20_operating_class);
	wpabuf_free(anqp->hs20_osu_providers_list);
#endif /* CONFIG_HS20 */

	os_free(anqp);
}


static void wpa_bss_update_pending_connect(struct wpa_supplicant *wpa_s,
					   struct wpa_bss *old_bss,
					   struct wpa_bss *new_bss)
{
	struct wpa_radio_work *work;
	struct wpa_connect_work *cwork;

	work = radio_work_pending(wpa_s, "sme-connect");
	if (!work)
		work = radio_work_pending(wpa_s, "connect");
	if (!work)
		return;

	cwork = work->ctx;
	if (cwork->bss != old_bss)
		return;

	wpa_printf(MSG_DEBUG,
		   "Update BSS pointer for the pending connect radio work");
	cwork->bss = new_bss;
	if (!new_bss)
		cwork->bss_removed = 1;
}


static void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
			   const char *reason)
{
	if (wpa_s->last_scan_res) {
		unsigned int i;
		for (i = 0; i < wpa_s->last_scan_res_used; i++) {
			if (wpa_s->last_scan_res[i] == bss) {
				os_memmove(&wpa_s->last_scan_res[i],
					   &wpa_s->last_scan_res[i + 1],
					   (wpa_s->last_scan_res_used - i - 1)
					   * sizeof(struct wpa_bss *));
				wpa_s->last_scan_res_used--;
				break;
			}
		}
	}
	wpa_bss_update_pending_connect(wpa_s, bss, NULL);
	dl_list_del(&bss->list);
	dl_list_del(&bss->list_id);
	wpa_s->num_bss--;
	wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Remove id %u BSSID " MACSTR
		" SSID '%s' due to %s", bss->id, MAC2STR(bss->bssid),
		wpa_ssid_txt(bss->ssid, bss->ssid_len), reason);
	wpas_notify_bss_removed(wpa_s, bss->bssid, bss->id);
	wpa_bss_anqp_free(bss->anqp);
	os_free(bss);
}


/**
 * wpa_bss_get - Fetch a BSS table entry based on BSSID and SSID
 * @wpa_s: Pointer to wpa_supplicant data
 * @bssid: BSSID
 * @ssid: SSID
 * @ssid_len: Length of @ssid
 * Returns: Pointer to the BSS entry or %NULL if not found
 */
struct wpa_bss * wpa_bss_get(struct wpa_supplicant *wpa_s, const u8 *bssid,
			     const u8 *ssid, size_t ssid_len)
{
	struct wpa_bss *bss;
	if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
		return NULL;
	dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
		if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0 &&
		    bss->ssid_len == ssid_len &&
		    os_memcmp(bss->ssid, ssid, ssid_len) == 0)
			return bss;
	}
	return NULL;
}


static void calculate_update_time(const struct os_reltime *fetch_time,
				  unsigned int age_ms,
				  struct os_reltime *update_time)
{
	os_time_t usec;

	update_time->sec = fetch_time->sec;
	update_time->usec = fetch_time->usec;
	update_time->sec -= age_ms / 1000;
	usec = (age_ms % 1000) * 1000;
	if (update_time->usec < usec) {
		update_time->sec--;
		update_time->usec += 1000000;
	}
	update_time->usec -= usec;
}


static void wpa_bss_copy_res(struct wpa_bss *dst, struct wpa_scan_res *src,
			     struct os_reltime *fetch_time)
{
	dst->flags = src->flags;
	os_memcpy(dst->bssid, src->bssid, ETH_ALEN);
	dst->freq = src->freq;
	dst->beacon_int = src->beacon_int;
	dst->caps = src->caps;
	dst->qual = src->qual;
	dst->noise = src->noise;
	dst->level = src->level;
	dst->tsf = src->tsf;
	dst->est_throughput = src->est_throughput;
	dst->snr = src->snr;

	calculate_update_time(fetch_time, src->age, &dst->last_update);
}


static int wpa_bss_known(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
{
	struct wpa_ssid *ssid;

	for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
		if (ssid->ssid == NULL || ssid->ssid_len == 0)
			continue;
		if (ssid->ssid_len == bss->ssid_len &&
		    os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) == 0)
			return 1;
	}

	return 0;
}


static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
{
	return bss == wpa_s->current_bss ||
		(!is_zero_ether_addr(bss->bssid) &&
		 (os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 ||
		  os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0));
}


static int wpa_bss_remove_oldest_unknown(struct wpa_supplicant *wpa_s)
{
	struct wpa_bss *bss;

	dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
		if (!wpa_bss_known(wpa_s, bss)) {
			wpa_bss_remove(wpa_s, bss, __func__);
			return 0;
		}
	}

	return -1;
}


static int wpa_bss_remove_oldest(struct wpa_supplicant *wpa_s)
{
	struct wpa_bss *bss;

	/*
	 * Remove the oldest entry that does not match with any configured
	 * network.
	 */
	if (wpa_bss_remove_oldest_unknown(wpa_s) == 0)
		return 0;

	/*
	 * Remove the oldest entry that isn't currently in use.
	 */
	dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
		if (!wpa_bss_in_use(wpa_s, bss)) {
			wpa_bss_remove(wpa_s, bss, __func__);
			return 0;
		}
	}

	return -1;
}


static struct wpa_bss * wpa_bss_add(struct wpa_supplicant *wpa_s,
				    const u8 *ssid, size_t ssid_len,
				    struct wpa_scan_res *res,
				    struct os_reltime *fetch_time)
{
	struct wpa_bss *bss;

	bss = os_zalloc(sizeof(*bss) + res->ie_len + res->beacon_ie_len);
	if (bss == NULL)
		return NULL;
	bss->id = wpa_s->bss_next_id++;
	bss->last_update_idx = wpa_s->bss_update_idx;
	wpa_bss_copy_res(bss, res, fetch_time);
	os_memcpy(bss->ssid, ssid, ssid_len);
	bss->ssid_len = ssid_len;
	bss->ie_len = res->ie_len;
	bss->beacon_ie_len = res->beacon_ie_len;
	os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
	wpa_bss_set_hessid(bss);

	if (wpa_s->num_bss + 1 > wpa_s->conf->bss_max_count &&
	    wpa_bss_remove_oldest(wpa_s) != 0) {
		wpa_printf(MSG_ERROR, "Increasing the MAX BSS count to %d "
			   "because all BSSes are in use. We should normally "
			   "not get here!", (int) wpa_s->num_bss + 1);
		wpa_s->conf->bss_max_count = wpa_s->num_bss + 1;
	}

	dl_list_add_tail(&wpa_s->bss, &bss->list);
	dl_list_add_tail(&wpa_s->bss_id, &bss->list_id);
	wpa_s->num_bss++;
	wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR
		" SSID '%s'",
		bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len));
	wpas_notify_bss_added(wpa_s, bss->bssid, bss->id);
	return bss;
}


static int are_ies_equal(const struct wpa_bss *old,
			 const struct wpa_scan_res *new_res, u32 ie)
{
	const u8 *old_ie, *new_ie;
	struct wpabuf *old_ie_buff = NULL;
	struct wpabuf *new_ie_buff = NULL;
	int new_ie_len, old_ie_len, ret, is_multi;

	switch (ie) {
	case WPA_IE_VENDOR_TYPE:
		old_ie = wpa_bss_get_vendor_ie(old, ie);
		new_ie = wpa_scan_get_vendor_ie(new_res, ie);
		is_multi = 0;
		break;
	case WPS_IE_VENDOR_TYPE:
		old_ie_buff = wpa_bss_get_vendor_ie_multi(old, ie);
		new_ie_buff = wpa_scan_get_vendor_ie_multi(new_res, ie);
		is_multi = 1;
		break;
	case WLAN_EID_RSN:
	case WLAN_EID_SUPP_RATES:
	case WLAN_EID_EXT_SUPP_RATES:
		old_ie = wpa_bss_get_ie(old, ie);
		new_ie = wpa_scan_get_ie(new_res, ie);
		is_multi = 0;
		break;
	default:
		wpa_printf(MSG_DEBUG, "bss: %s: cannot compare IEs", __func__);
		return 0;
	}

	if (is_multi) {
		/* in case of multiple IEs stored in buffer */
		old_ie = old_ie_buff ? wpabuf_head_u8(old_ie_buff) : NULL;
		new_ie = new_ie_buff ? wpabuf_head_u8(new_ie_buff) : NULL;
		old_ie_len = old_ie_buff ? wpabuf_len(old_ie_buff) : 0;
		new_ie_len = new_ie_buff ? wpabuf_len(new_ie_buff) : 0;
	} else {
		/* in case of single IE */
		old_ie_len = old_ie ? old_ie[1] + 2 : 0;
		new_ie_len = new_ie ? new_ie[1] + 2 : 0;
	}

	if (!old_ie || !new_ie)
		ret = !old_ie && !new_ie;
	else
		ret = (old_ie_len == new_ie_len &&
		       os_memcmp(old_ie, new_ie, old_ie_len) == 0);

	wpabuf_free(old_ie_buff);
	wpabuf_free(new_ie_buff);

	return ret;
}


static u32 wpa_bss_compare_res(const struct wpa_bss *old,
			       const struct wpa_scan_res *new_res)
{
	u32 changes = 0;
	int caps_diff = old->caps ^ new_res->caps;

	if (old->freq != new_res->freq)
		changes |= WPA_BSS_FREQ_CHANGED_FLAG;

	if (old->level != new_res->level)
		changes |= WPA_BSS_SIGNAL_CHANGED_FLAG;

	if (caps_diff & IEEE80211_CAP_PRIVACY)
		changes |= WPA_BSS_PRIVACY_CHANGED_FLAG;

	if (caps_diff & IEEE80211_CAP_IBSS)
		changes |= WPA_BSS_MODE_CHANGED_FLAG;

	if (old->ie_len == new_res->ie_len &&
	    os_memcmp(old + 1, new_res + 1, old->ie_len) == 0)
		return changes;
	changes |= WPA_BSS_IES_CHANGED_FLAG;

	if (!are_ies_equal(old, new_res, WPA_IE_VENDOR_TYPE))
		changes |= WPA_BSS_WPAIE_CHANGED_FLAG;

	if (!are_ies_equal(old, new_res, WLAN_EID_RSN))
		changes |= WPA_BSS_RSNIE_CHANGED_FLAG;

	if (!are_ies_equal(old, new_res, WPS_IE_VENDOR_TYPE))
		changes |= WPA_BSS_WPS_CHANGED_FLAG;

	if (!are_ies_equal(old, new_res, WLAN_EID_SUPP_RATES) ||
	    !are_ies_equal(old, new_res, WLAN_EID_EXT_SUPP_RATES))
		changes |= WPA_BSS_RATES_CHANGED_FLAG;

	return changes;
}


static void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes,
			       const struct wpa_bss *bss)
{
	if (changes & WPA_BSS_FREQ_CHANGED_FLAG)
		wpas_notify_bss_freq_changed(wpa_s, bss->id);

	if (changes & WPA_BSS_SIGNAL_CHANGED_FLAG)
		wpas_notify_bss_signal_changed(wpa_s, bss->id);

	if (changes & WPA_BSS_PRIVACY_CHANGED_FLAG)
		wpas_notify_bss_privacy_changed(wpa_s, bss->id);

	if (changes & WPA_BSS_MODE_CHANGED_FLAG)
		wpas_notify_bss_mode_changed(wpa_s, bss->id);

	if (changes & WPA_BSS_WPAIE_CHANGED_FLAG)
		wpas_notify_bss_wpaie_changed(wpa_s, bss->id);

	if (changes & WPA_BSS_RSNIE_CHANGED_FLAG)
		wpas_notify_bss_rsnie_changed(wpa_s, bss->id);

	if (changes & WPA_BSS_WPS_CHANGED_FLAG)
		wpas_notify_bss_wps_changed(wpa_s, bss->id);

	if (changes & WPA_BSS_IES_CHANGED_FLAG)
		wpas_notify_bss_ies_changed(wpa_s, bss->id);

	if (changes & WPA_BSS_RATES_CHANGED_FLAG)
		wpas_notify_bss_rates_changed(wpa_s, bss->id);

	wpas_notify_bss_seen(wpa_s, bss->id);
}


static struct wpa_bss *
wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
	       struct wpa_scan_res *res, struct os_reltime *fetch_time)
{
	u32 changes;

	changes = wpa_bss_compare_res(bss, res);
	bss->scan_miss_count = 0;
	bss->last_update_idx = wpa_s->bss_update_idx;
	wpa_bss_copy_res(bss, res, fetch_time);
	/* Move the entry to the end of the list */
	dl_list_del(&bss->list);
#ifdef CONFIG_P2P
	if (wpa_bss_get_vendor_ie(bss, P2P_IE_VENDOR_TYPE) &&
	    !wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE)) {
		/*
		 * This can happen when non-P2P station interface runs a scan
		 * without P2P IE in the Probe Request frame. P2P GO would reply
		 * to that with a Probe Response that does not include P2P IE.
		 * Do not update the IEs in this BSS entry to avoid such loss of
		 * information that may be needed for P2P operations to
		 * determine group information.
		 */
		wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Do not update scan IEs for "
			MACSTR " since that would remove P2P IE information",
			MAC2STR(bss->bssid));
	} else
#endif /* CONFIG_P2P */
	if (bss->ie_len + bss->beacon_ie_len >=
	    res->ie_len + res->beacon_ie_len) {
		os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
		bss->ie_len = res->ie_len;
		bss->beacon_ie_len = res->beacon_ie_len;
	} else {
		struct wpa_bss *nbss;
		struct dl_list *prev = bss->list_id.prev;
		dl_list_del(&bss->list_id);
		nbss = os_realloc(bss, sizeof(*bss) + res->ie_len +
				  res->beacon_ie_len);
		if (nbss) {
			unsigned int i;
			for (i = 0; i < wpa_s->last_scan_res_used; i++) {
				if (wpa_s->last_scan_res[i] == bss) {
					wpa_s->last_scan_res[i] = nbss;
					break;
				}
			}
			if (wpa_s->current_bss == bss)
				wpa_s->current_bss = nbss;
			wpa_bss_update_pending_connect(wpa_s, bss, nbss);
			bss = nbss;
			os_memcpy(bss + 1, res + 1,
				  res->ie_len + res->beacon_ie_len);
			bss->ie_len = res->ie_len;
			bss->beacon_ie_len = res->beacon_ie_len;
		}
		dl_list_add(prev, &bss->list_id);
	}
	if (changes & WPA_BSS_IES_CHANGED_FLAG)
		wpa_bss_set_hessid(bss);
	dl_list_add_tail(&wpa_s->bss, &bss->list);

	notify_bss_changes(wpa_s, changes, bss);

	return bss;
}


/**
 * wpa_bss_update_start - Start a BSS table update from scan results
 * @wpa_s: Pointer to wpa_supplicant data
 *
 * This function is called at the start of each BSS table update round for new
 * scan results. The actual scan result entries are indicated with calls to
 * wpa_bss_update_scan_res() and the update round is finished with a call to
 * wpa_bss_update_end().
 */
void wpa_bss_update_start(struct wpa_supplicant *wpa_s)
{
	wpa_s->bss_update_idx++;
	wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Start scan result update %u",
		wpa_s->bss_update_idx);
	wpa_s->last_scan_res_used = 0;
}


/**
 * wpa_bss_update_scan_res - Update a BSS table entry based on a scan result
 * @wpa_s: Pointer to wpa_supplicant data
 * @res: Scan result
 * @fetch_time: Time when the result was fetched from the driver
 *
 * This function updates a BSS table entry (or adds one) based on a scan result.
 * This is called separately for each scan result between the calls to
 * wpa_bss_update_start() and wpa_bss_update_end().
 */
void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s,
			     struct wpa_scan_res *res,
			     struct os_reltime *fetch_time)
{
	const u8 *ssid, *p2p, *mesh;
	struct wpa_bss *bss;

	if (wpa_s->conf->ignore_old_scan_res) {
		struct os_reltime update;
		calculate_update_time(fetch_time, res->age, &update);
		if (os_reltime_before(&update, &wpa_s->scan_trigger_time)) {
			struct os_reltime age;
			os_reltime_sub(&wpa_s->scan_trigger_time, &update,
				       &age);
			wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Ignore driver BSS "
				"table entry that is %u.%06u seconds older "
				"than our scan trigger",
				(unsigned int) age.sec,
				(unsigned int) age.usec);
			return;
		}
	}

	ssid = wpa_scan_get_ie(res, WLAN_EID_SSID);
	if (ssid == NULL) {
		wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for "
			MACSTR, MAC2STR(res->bssid));
		return;
	}
	if (ssid[1] > SSID_MAX_LEN) {
		wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Too long SSID IE included for "
			MACSTR, MAC2STR(res->bssid));
		return;
	}

	p2p = wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE);
#ifdef CONFIG_P2P
	if (p2p == NULL &&
	    wpa_s->p2p_group_interface != NOT_P2P_GROUP_INTERFACE) {
		/*
		 * If it's a P2P specific interface, then don't update
		 * the scan result without a P2P IE.
		 */
		wpa_printf(MSG_DEBUG, "BSS: No P2P IE - skipping BSS " MACSTR
			   " update for P2P interface", MAC2STR(res->bssid));
		return;
	}
#endif /* CONFIG_P2P */
	if (p2p && ssid[1] == P2P_WILDCARD_SSID_LEN &&
	    os_memcmp(ssid + 2, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) == 0)
		return; /* Skip P2P listen discovery results here */

	/* TODO: add option for ignoring BSSes we are not interested in
	 * (to save memory) */

	mesh = wpa_scan_get_ie(res, WLAN_EID_MESH_ID);
	if (mesh && mesh[1] <= SSID_MAX_LEN)
		ssid = mesh;

	bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]);
	if (bss == NULL)
		bss = wpa_bss_add(wpa_s, ssid + 2, ssid[1], res, fetch_time);
	else {
		bss = wpa_bss_update(wpa_s, bss, res, fetch_time);
		if (wpa_s->last_scan_res) {
			unsigned int i;
			for (i = 0; i < wpa_s->last_scan_res_used; i++) {
				if (bss == wpa_s->last_scan_res[i]) {
					/* Already in the list */
					return;
				}
			}
		}
	}

	if (bss == NULL)
		return;
	if (wpa_s->last_scan_res_used >= wpa_s->last_scan_res_size) {
		struct wpa_bss **n;
		unsigned int siz;
		if (wpa_s->last_scan_res_size == 0)
			siz = 32;
		else
			siz = wpa_s->last_scan_res_size * 2;
		n = os_realloc_array(wpa_s->last_scan_res, siz,
				     sizeof(struct wpa_bss *));
		if (n == NULL)
			return;
		wpa_s->last_scan_res = n;
		wpa_s->last_scan_res_size = siz;
	}

	if (wpa_s->last_scan_res)
		wpa_s->last_scan_res[wpa_s->last_scan_res_used++] = bss;
}


static int wpa_bss_included_in_scan(const struct wpa_bss *bss,
				    const struct scan_info *info)
{
	int found;
	size_t i;

	if (info == NULL)
		return 1;

	if (info->num_freqs) {
		found = 0;
		for (i = 0; i < info->num_freqs; i++) {
			if (bss->freq == info->freqs[i]) {
				found = 1;
				break;
			}
		}
		if (!found)
			return 0;
	}

	if (info->num_ssids) {
		found = 0;
		for (i = 0; i < info->num_ssids; i++) {
			const struct wpa_driver_scan_ssid *s = &info->ssids[i];
			if ((s->ssid == NULL || s->ssid_len == 0) ||
			    (s->ssid_len == bss->ssid_len &&
			     os_memcmp(s->ssid, bss->ssid, bss->ssid_len) ==
			     0)) {
				found = 1;
				break;
			}
		}
		if (!found)
			return 0;
	}

	return 1;
}


/**
 * wpa_bss_update_end - End a BSS table update from scan results
 * @wpa_s: Pointer to wpa_supplicant data
 * @info: Information about scan parameters
 * @new_scan: Whether this update round was based on a new scan
 *
 * This function is called at the end of each BSS table update round for new
 * scan results. The start of the update was indicated with a call to
 * wpa_bss_update_start().
 */
void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info,
			int new_scan)
{
	struct wpa_bss *bss, *n;

	os_get_reltime(&wpa_s->last_scan);
	if (!new_scan)
		return; /* do not expire entries without new scan */

	dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
		if (wpa_bss_in_use(wpa_s, bss))
			continue;
		if (!wpa_bss_included_in_scan(bss, info))
			continue; /* expire only BSSes that were scanned */
		if (bss->last_update_idx < wpa_s->bss_update_idx)
			bss->scan_miss_count++;
		if (bss->scan_miss_count >=
		    wpa_s->conf->bss_expiration_scan_count) {
			wpa_bss_remove(wpa_s, bss, "no match in scan");
		}
	}

	wpa_printf(MSG_DEBUG, "BSS: last_scan_res_used=%u/%u",
		   wpa_s->last_scan_res_used, wpa_s->last_scan_res_size);
}


/**
 * wpa_bss_flush_by_age - Flush old BSS entries
 * @wpa_s: Pointer to wpa_supplicant data
 * @age: Maximum entry age in seconds
 *
 * Remove BSS entries that have not been updated during the last @age seconds.
 */
void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age)
{
	struct wpa_bss *bss, *n;
	struct os_reltime t;

	if (dl_list_empty(&wpa_s->bss))
		return;

	os_get_reltime(&t);
	t.sec -= age;

	dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
		if (wpa_bss_in_use(wpa_s, bss))
			continue;

		if (os_reltime_before(&bss->last_update, &t)) {
			wpa_bss_remove(wpa_s, bss, __func__);
		} else
			break;
	}
}


/**
 * wpa_bss_init - Initialize BSS table
 * @wpa_s: Pointer to wpa_supplicant data
 * Returns: 0 on success, -1 on failure
 *
 * This prepares BSS table lists and timer for periodic updates. The BSS table
 * is deinitialized with wpa_bss_deinit() once not needed anymore.
 */
int wpa_bss_init(struct wpa_supplicant *wpa_s)
{
	dl_list_init(&wpa_s->bss);
	dl_list_init(&wpa_s->bss_id);
	return 0;
}


/**
 * wpa_bss_flush - Flush all unused BSS entries
 * @wpa_s: Pointer to wpa_supplicant data
 */
void wpa_bss_flush(struct wpa_supplicant *wpa_s)
{
	struct wpa_bss *bss, *n;

	wpa_s->clear_driver_scan_cache = 1;

	if (wpa_s->bss.next == NULL)
		return; /* BSS table not yet initialized */

	dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
		if (wpa_bss_in_use(wpa_s, bss))
			continue;
		wpa_bss_remove(wpa_s, bss, __func__);
	}
}


/**
 * wpa_bss_deinit - Deinitialize BSS table
 * @wpa_s: Pointer to wpa_supplicant data
 */
void wpa_bss_deinit(struct wpa_supplicant *wpa_s)
{
	wpa_bss_flush(wpa_s);
}


/**
 * wpa_bss_get_bssid - Fetch a BSS table entry based on BSSID
 * @wpa_s: Pointer to wpa_supplicant data
 * @bssid: BSSID
 * Returns: Pointer to the BSS entry or %NULL if not found
 */
struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s,
				   const u8 *bssid)
{
	struct wpa_bss *bss;
	if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
		return NULL;
	dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
		if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0)
			return bss;
	}
	return NULL;
}


/**
 * wpa_bss_get_bssid_latest - Fetch the latest BSS table entry based on BSSID
 * @wpa_s: Pointer to wpa_supplicant data
 * @bssid: BSSID
 * Returns: Pointer to the BSS entry or %NULL if not found
 *
 * This function is like wpa_bss_get_bssid(), but full BSS table is iterated to
 * find the entry that has the most recent update. This can help in finding the
 * correct entry in cases where the SSID of the AP may have changed recently
 * (e.g., in WPS reconfiguration cases).
 */
struct wpa_bss * wpa_bss_get_bssid_latest(struct wpa_supplicant *wpa_s,
					  const u8 *bssid)
{
	struct wpa_bss *bss, *found = NULL;
	if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
		return NULL;
	dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
		if (os_memcmp(bss->bssid, bssid, ETH_ALEN) != 0)
			continue;
		if (found == NULL ||
		    os_reltime_before(&found->last_update, &bss->last_update))
			found = bss;
	}
	return found;
}


#ifdef CONFIG_P2P
/**
 * wpa_bss_get_p2p_dev_addr - Fetch a BSS table entry based on P2P Device Addr
 * @wpa_s: Pointer to wpa_supplicant data
 * @dev_addr: P2P Device Address of the GO
 * Returns: Pointer to the BSS entry or %NULL if not found
 */
struct wpa_bss * wpa_bss_get_p2p_dev_addr(struct wpa_supplicant *wpa_s,
					  const u8 *dev_addr)
{
	struct wpa_bss *bss;
	dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
		u8 addr[ETH_ALEN];
		if (p2p_parse_dev_addr((const u8 *) (bss + 1), bss->ie_len,
				       addr) == 0 &&
		    os_memcmp(addr, dev_addr, ETH_ALEN) == 0)
			return bss;
	}
	return NULL;
}
#endif /* CONFIG_P2P */


/**
 * wpa_bss_get_id - Fetch a BSS table entry based on identifier
 * @wpa_s: Pointer to wpa_supplicant data
 * @id: Unique identifier (struct wpa_bss::id) assigned for the entry
 * Returns: Pointer to the BSS entry or %NULL if not found
 */
struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id)
{
	struct wpa_bss *bss;
	dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
		if (bss->id == id)
			return bss;
	}
	return NULL;
}


/**
 * wpa_bss_get_id_range - Fetch a BSS table entry based on identifier range
 * @wpa_s: Pointer to wpa_supplicant data
 * @idf: Smallest allowed identifier assigned for the entry
 * @idf: Largest allowed identifier assigned for the entry
 * Returns: Pointer to the BSS entry or %NULL if not found
 *
 * This function is similar to wpa_bss_get_id() but allows a BSS entry with the
 * smallest id value to be fetched within the specified range without the
 * caller having to know the exact id.
 */
struct wpa_bss * wpa_bss_get_id_range(struct wpa_supplicant *wpa_s,
				      unsigned int idf, unsigned int idl)
{
	struct wpa_bss *bss;
	dl_list_for_each(bss, &wpa_s->bss_id, struct wpa_bss, list_id) {
		if (bss->id >= idf && bss->id <= idl)
			return bss;
	}
	return NULL;
}


/**
 * wpa_bss_get_ie - Fetch a specified information element from a BSS entry
 * @bss: BSS table entry
 * @ie: Information element identitifier (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 BSS
 * entry.
 */
const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie)
{
	const u8 *end, *pos;

	pos = (const u8 *) (bss + 1);
	end = pos + bss->ie_len;

	while (pos + 1 < end) {
		if (pos + 2 + pos[1] > end)
			break;
		if (pos[0] == ie)
			return pos;
		pos += 2 + pos[1];
	}

	return NULL;
}


/**
 * wpa_bss_get_vendor_ie - Fetch a vendor information element from a BSS entry
 * @bss: BSS table entry
 * @vendor_type: Vendor type (four octets starting the IE payload)
 * Returns: Pointer to the information element (id field) or %NULL if not found
 *
 * This function returns the first matching information element in the BSS
 * entry.
 */
const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type)
{
	const u8 *end, *pos;

	pos = (const u8 *) (bss + 1);
	end = pos + bss->ie_len;

	while (pos + 1 < end) {
		if (pos + 2 + pos[1] > end)
			break;
		if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
		    vendor_type == WPA_GET_BE32(&pos[2]))
			return pos;
		pos += 2 + pos[1];
	}

	return NULL;
}


/**
 * wpa_bss_get_vendor_ie_beacon - Fetch a vendor information from a BSS entry
 * @bss: BSS table entry
 * @vendor_type: Vendor type (four octets starting the IE payload)
 * Returns: Pointer to the information element (id field) or %NULL if not found
 *
 * This function returns the first matching information element in the BSS
 * entry.
 *
 * This function is like wpa_bss_get_vendor_ie(), but uses IE buffer only
 * from Beacon frames instead of either Beacon or Probe Response frames.
 */
const u8 * wpa_bss_get_vendor_ie_beacon(const struct wpa_bss *bss,
					u32 vendor_type)
{
	const u8 *end, *pos;

	if (bss->beacon_ie_len == 0)
		return NULL;

	pos = (const u8 *) (bss + 1);
	pos += bss->ie_len;
	end = pos + bss->beacon_ie_len;

	while (pos + 1 < end) {
		if (pos + 2 + pos[1] > end)
			break;
		if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
		    vendor_type == WPA_GET_BE32(&pos[2]))
			return pos;
		pos += 2 + pos[1];
	}

	return NULL;
}


/**
 * wpa_bss_get_vendor_ie_multi - Fetch vendor IE data from a BSS entry
 * @bss: BSS table entry
 * @vendor_type: Vendor type (four octets starting the IE payload)
 * Returns: Pointer to the information element payload or %NULL if not found
 *
 * This function returns concatenated payload of possibly fragmented vendor
 * specific information elements in the BSS entry. The caller is responsible for
 * freeing the returned buffer.
 */
struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss,
					    u32 vendor_type)
{
	struct wpabuf *buf;
	const u8 *end, *pos;

	buf = wpabuf_alloc(bss->ie_len);
	if (buf == NULL)
		return NULL;

	pos = (const u8 *) (bss + 1);
	end = pos + bss->ie_len;

	while (pos + 1 < end) {
		if (pos + 2 + pos[1] > end)
			break;
		if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
		    vendor_type == WPA_GET_BE32(&pos[2]))
			wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
		pos += 2 + pos[1];
	}

	if (wpabuf_len(buf) == 0) {
		wpabuf_free(buf);
		buf = NULL;
	}

	return buf;
}


/**
 * wpa_bss_get_vendor_ie_multi_beacon - Fetch vendor IE data from a BSS entry
 * @bss: BSS table entry
 * @vendor_type: Vendor type (four octets starting the IE payload)
 * Returns: Pointer to the information element payload or %NULL if not found
 *
 * This function returns concatenated payload of possibly fragmented vendor
 * specific information elements in the BSS entry. The caller is responsible for
 * freeing the returned buffer.
 *
 * This function is like wpa_bss_get_vendor_ie_multi(), but uses IE buffer only
 * from Beacon frames instead of either Beacon or Probe Response frames.
 */
struct wpabuf * wpa_bss_get_vendor_ie_multi_beacon(const struct wpa_bss *bss,
						   u32 vendor_type)
{
	struct wpabuf *buf;
	const u8 *end, *pos;

	buf = wpabuf_alloc(bss->beacon_ie_len);
	if (buf == NULL)
		return NULL;

	pos = (const u8 *) (bss + 1);
	pos += bss->ie_len;
	end = pos + bss->beacon_ie_len;

	while (pos + 1 < end) {
		if (pos + 2 + pos[1] > end)
			break;
		if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
		    vendor_type == WPA_GET_BE32(&pos[2]))
			wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
		pos += 2 + pos[1];
	}

	if (wpabuf_len(buf) == 0) {
		wpabuf_free(buf);
		buf = NULL;
	}

	return buf;
}


/**
 * wpa_bss_get_max_rate - Get maximum legacy TX rate supported in a BSS
 * @bss: BSS table entry
 * Returns: Maximum legacy rate in units of 500 kbps
 */
int wpa_bss_get_max_rate(const struct wpa_bss *bss)
{
	int rate = 0;
	const u8 *ie;
	int i;

	ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
	for (i = 0; ie && i < ie[1]; i++) {
		if ((ie[i + 2] & 0x7f) > rate)
			rate = ie[i + 2] & 0x7f;
	}

	ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
	for (i = 0; ie && i < ie[1]; i++) {
		if ((ie[i + 2] & 0x7f) > rate)
			rate = ie[i + 2] & 0x7f;
	}

	return rate;
}


/**
 * wpa_bss_get_bit_rates - Get legacy TX rates supported in a BSS
 * @bss: BSS table entry
 * @rates: Buffer for returning a pointer to the rates list (units of 500 kbps)
 * Returns: number of legacy TX rates or -1 on failure
 *
 * The caller is responsible for freeing the returned buffer with os_free() in
 * case of success.
 */
int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates)
{
	const u8 *ie, *ie2;
	int i, j;
	unsigned int len;
	u8 *r;

	ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
	ie2 = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);

	len = (ie ? ie[1] : 0) + (ie2 ? ie2[1] : 0);

	r = os_malloc(len);
	if (!r)
		return -1;

	for (i = 0; ie && i < ie[1]; i++)
		r[i] = ie[i + 2] & 0x7f;

	for (j = 0; ie2 && j < ie2[1]; j++)
		r[i + j] = ie2[j + 2] & 0x7f;

	*rates = r;
	return len;
}