aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/wireless/mac80211_hwsim.c
blob: 454f045ddff33118525f93142e53349622e015c3 (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
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
/*
 * mac80211_hwsim - software simulator of 802.11 radio(s) for mac80211
 * Copyright (c) 2008, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

/*
 * TODO:
 * - Add TSF sync and fix IBSS beacon transmission by adding
 *   competition for "air time" at TBTT
 * - RX filtering based on filter configuration (data->rx_filter)
 */

#include <linux/list.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <net/dst.h>
#include <net/xfrm.h>
#include <net/mac80211.h>
#include <net/ieee80211_radiotap.h>
#include <linux/if_arp.h>
#include <linux/rtnetlink.h>
#include <linux/etherdevice.h>
#include <linux/debugfs.h>

MODULE_AUTHOR("Jouni Malinen");
MODULE_DESCRIPTION("Software simulator of 802.11 radio(s) for mac80211");
MODULE_LICENSE("GPL");

static int radios = 2;
module_param(radios, int, 0444);
MODULE_PARM_DESC(radios, "Number of simulated radios");

static bool fake_hw_scan;
module_param(fake_hw_scan, bool, 0444);
MODULE_PARM_DESC(fake_hw_scan, "Install fake (no-op) hw-scan handler");

/**
 * enum hwsim_regtest - the type of regulatory tests we offer
 *
 * These are the different values you can use for the regtest
 * module parameter. This is useful to help test world roaming
 * and the driver regulatory_hint() call and combinations of these.
 * If you want to do specific alpha2 regulatory domain tests simply
 * use the userspace regulatory request as that will be respected as
 * well without the need of this module parameter. This is designed
 * only for testing the driver regulatory request, world roaming
 * and all possible combinations.
 *
 * @HWSIM_REGTEST_DISABLED: No regulatory tests are performed,
 * 	this is the default value.
 * @HWSIM_REGTEST_DRIVER_REG_FOLLOW: Used for testing the driver regulatory
 *	hint, only one driver regulatory hint will be sent as such the
 * 	secondary radios are expected to follow.
 * @HWSIM_REGTEST_DRIVER_REG_ALL: Used for testing the driver regulatory
 * 	request with all radios reporting the same regulatory domain.
 * @HWSIM_REGTEST_DIFF_COUNTRY: Used for testing the drivers calling
 * 	different regulatory domains requests. Expected behaviour is for
 * 	an intersection to occur but each device will still use their
 * 	respective regulatory requested domains. Subsequent radios will
 * 	use the resulting intersection.
 * @HWSIM_REGTEST_WORLD_ROAM: Used for testing the world roaming. We acomplish
 *	this by using a custom beacon-capable regulatory domain for the first
 *	radio. All other device world roam.
 * @HWSIM_REGTEST_CUSTOM_WORLD: Used for testing the custom world regulatory
 * 	domain requests. All radios will adhere to this custom world regulatory
 * 	domain.
 * @HWSIM_REGTEST_CUSTOM_WORLD_2: Used for testing 2 custom world regulatory
 * 	domain requests. The first radio will adhere to the first custom world
 * 	regulatory domain, the second one to the second custom world regulatory
 * 	domain. All other devices will world roam.
 * @HWSIM_REGTEST_STRICT_FOLLOW_: Used for testing strict regulatory domain
 *	settings, only the first radio will send a regulatory domain request
 *	and use strict settings. The rest of the radios are expected to follow.
 * @HWSIM_REGTEST_STRICT_ALL: Used for testing strict regulatory domain
 *	settings. All radios will adhere to this.
 * @HWSIM_REGTEST_STRICT_AND_DRIVER_REG: Used for testing strict regulatory
 *	domain settings, combined with secondary driver regulatory domain
 *	settings. The first radio will get a strict regulatory domain setting
 *	using the first driver regulatory request and the second radio will use
 *	non-strict settings using the second driver regulatory request. All
 *	other devices should follow the intersection created between the
 *	first two.
 * @HWSIM_REGTEST_ALL: Used for testing every possible mix. You will need
 * 	at least 6 radios for a complete test. We will test in this order:
 * 	1 - driver custom world regulatory domain
 * 	2 - second custom world regulatory domain
 * 	3 - first driver regulatory domain request
 * 	4 - second driver regulatory domain request
 * 	5 - strict regulatory domain settings using the third driver regulatory
 * 	    domain request
 * 	6 and on - should follow the intersection of the 3rd, 4rth and 5th radio
 * 	           regulatory requests.
 */
enum hwsim_regtest {
	HWSIM_REGTEST_DISABLED = 0,
	HWSIM_REGTEST_DRIVER_REG_FOLLOW = 1,
	HWSIM_REGTEST_DRIVER_REG_ALL = 2,
	HWSIM_REGTEST_DIFF_COUNTRY = 3,
	HWSIM_REGTEST_WORLD_ROAM = 4,
	HWSIM_REGTEST_CUSTOM_WORLD = 5,
	HWSIM_REGTEST_CUSTOM_WORLD_2 = 6,
	HWSIM_REGTEST_STRICT_FOLLOW = 7,
	HWSIM_REGTEST_STRICT_ALL = 8,
	HWSIM_REGTEST_STRICT_AND_DRIVER_REG = 9,
	HWSIM_REGTEST_ALL = 10,
};

/* Set to one of the HWSIM_REGTEST_* values above */
static int regtest = HWSIM_REGTEST_DISABLED;
module_param(regtest, int, 0444);
MODULE_PARM_DESC(regtest, "The type of regulatory test we want to run");

static const char *hwsim_alpha2s[] = {
	"FI",
	"AL",
	"US",
	"DE",
	"JP",
	"AL",
};

static const struct ieee80211_regdomain hwsim_world_regdom_custom_01 = {
	.n_reg_rules = 4,
	.alpha2 =  "99",
	.reg_rules = {
		REG_RULE(2412-10, 2462+10, 40, 0, 20, 0),
		REG_RULE(2484-10, 2484+10, 40, 0, 20, 0),
		REG_RULE(5150-10, 5240+10, 40, 0, 30, 0),
		REG_RULE(5745-10, 5825+10, 40, 0, 30, 0),
	}
};

static const struct ieee80211_regdomain hwsim_world_regdom_custom_02 = {
	.n_reg_rules = 2,
	.alpha2 =  "99",
	.reg_rules = {
		REG_RULE(2412-10, 2462+10, 40, 0, 20, 0),
		REG_RULE(5725-10, 5850+10, 40, 0, 30,
			NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS),
	}
};

struct hwsim_vif_priv {
	u32 magic;
	u8 bssid[ETH_ALEN];
	bool assoc;
	u16 aid;
};

#define HWSIM_VIF_MAGIC	0x69537748

static inline void hwsim_check_magic(struct ieee80211_vif *vif)
{
	struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
	WARN_ON(vp->magic != HWSIM_VIF_MAGIC);
}

static inline void hwsim_set_magic(struct ieee80211_vif *vif)
{
	struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
	vp->magic = HWSIM_VIF_MAGIC;
}

static inline void hwsim_clear_magic(struct ieee80211_vif *vif)
{
	struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
	vp->magic = 0;
}

struct hwsim_sta_priv {
	u32 magic;
};

#define HWSIM_STA_MAGIC	0x6d537748

static inline void hwsim_check_sta_magic(struct ieee80211_sta *sta)
{
	struct hwsim_sta_priv *sp = (void *)sta->drv_priv;
	WARN_ON(sp->magic != HWSIM_STA_MAGIC);
}

static inline void hwsim_set_sta_magic(struct ieee80211_sta *sta)
{
	struct hwsim_sta_priv *sp = (void *)sta->drv_priv;
	sp->magic = HWSIM_STA_MAGIC;
}

static inline void hwsim_clear_sta_magic(struct ieee80211_sta *sta)
{
	struct hwsim_sta_priv *sp = (void *)sta->drv_priv;
	sp->magic = 0;
}

static struct class *hwsim_class;

static struct net_device *hwsim_mon; /* global monitor netdev */

#define CHAN2G(_freq)  { \
	.band = IEEE80211_BAND_2GHZ, \
	.center_freq = (_freq), \
	.hw_value = (_freq), \
	.max_power = 20, \
}

#define CHAN5G(_freq) { \
	.band = IEEE80211_BAND_5GHZ, \
	.center_freq = (_freq), \
	.hw_value = (_freq), \
	.max_power = 20, \
}

static const struct ieee80211_channel hwsim_channels_2ghz[] = {
	CHAN2G(2412), /* Channel 1 */
	CHAN2G(2417), /* Channel 2 */
	CHAN2G(2422), /* Channel 3 */
	CHAN2G(2427), /* Channel 4 */
	CHAN2G(2432), /* Channel 5 */
	CHAN2G(2437), /* Channel 6 */
	CHAN2G(2442), /* Channel 7 */
	CHAN2G(2447), /* Channel 8 */
	CHAN2G(2452), /* Channel 9 */
	CHAN2G(2457), /* Channel 10 */
	CHAN2G(2462), /* Channel 11 */
	CHAN2G(2467), /* Channel 12 */
	CHAN2G(2472), /* Channel 13 */
	CHAN2G(2484), /* Channel 14 */
};

static const struct ieee80211_channel hwsim_channels_5ghz[] = {
	CHAN5G(5180), /* Channel 36 */
	CHAN5G(5200), /* Channel 40 */
	CHAN5G(5220), /* Channel 44 */
	CHAN5G(5240), /* Channel 48 */

	CHAN5G(5260), /* Channel 52 */
	CHAN5G(5280), /* Channel 56 */
	CHAN5G(5300), /* Channel 60 */
	CHAN5G(5320), /* Channel 64 */

	CHAN5G(5500), /* Channel 100 */
	CHAN5G(5520), /* Channel 104 */
	CHAN5G(5540), /* Channel 108 */
	CHAN5G(5560), /* Channel 112 */
	CHAN5G(5580), /* Channel 116 */
	CHAN5G(5600), /* Channel 120 */
	CHAN5G(5620), /* Channel 124 */
	CHAN5G(5640), /* Channel 128 */
	CHAN5G(5660), /* Channel 132 */
	CHAN5G(5680), /* Channel 136 */
	CHAN5G(5700), /* Channel 140 */

	CHAN5G(5745), /* Channel 149 */
	CHAN5G(5765), /* Channel 153 */
	CHAN5G(5785), /* Channel 157 */
	CHAN5G(5805), /* Channel 161 */
	CHAN5G(5825), /* Channel 165 */
};

static const struct ieee80211_rate hwsim_rates[] = {
	{ .bitrate = 10 },
	{ .bitrate = 20, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	{ .bitrate = 55, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	{ .bitrate = 110, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	{ .bitrate = 60 },
	{ .bitrate = 90 },
	{ .bitrate = 120 },
	{ .bitrate = 180 },
	{ .bitrate = 240 },
	{ .bitrate = 360 },
	{ .bitrate = 480 },
	{ .bitrate = 540 }
};

static spinlock_t hwsim_radio_lock;
static struct list_head hwsim_radios;

struct mac80211_hwsim_data {
	struct list_head list;
	struct ieee80211_hw *hw;
	struct device *dev;
	struct ieee80211_supported_band bands[2];
	struct ieee80211_channel channels_2ghz[ARRAY_SIZE(hwsim_channels_2ghz)];
	struct ieee80211_channel channels_5ghz[ARRAY_SIZE(hwsim_channels_5ghz)];
	struct ieee80211_rate rates[ARRAY_SIZE(hwsim_rates)];

	struct mac_address addresses[2];

	struct ieee80211_channel *channel;
	unsigned long beacon_int; /* in jiffies unit */
	unsigned int rx_filter;
	bool started, idle, scanning;
	struct mutex mutex;
	struct timer_list beacon_timer;
	enum ps_mode {
		PS_DISABLED, PS_ENABLED, PS_AUTO_POLL, PS_MANUAL_POLL
	} ps;
	bool ps_poll_pending;
	struct dentry *debugfs;
	struct dentry *debugfs_ps;

	/*
	 * Only radios in the same group can communicate together (the
	 * channel has to match too). Each bit represents a group. A
	 * radio can be in more then one group.
	 */
	u64 group;
	struct dentry *debugfs_group;

	int power_level;
};


struct hwsim_radiotap_hdr {
	struct ieee80211_radiotap_header hdr;
	u8 rt_flags;
	u8 rt_rate;
	__le16 rt_channel;
	__le16 rt_chbitmask;
} __packed;


static netdev_tx_t hwsim_mon_xmit(struct sk_buff *skb,
					struct net_device *dev)
{
	/* TODO: allow packet injection */
	dev_kfree_skb(skb);
	return NETDEV_TX_OK;
}


static void mac80211_hwsim_monitor_rx(struct ieee80211_hw *hw,
				      struct sk_buff *tx_skb)
{
	struct mac80211_hwsim_data *data = hw->priv;
	struct sk_buff *skb;
	struct hwsim_radiotap_hdr *hdr;
	u16 flags;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx_skb);
	struct ieee80211_rate *txrate = ieee80211_get_tx_rate(hw, info);

	if (!netif_running(hwsim_mon))
		return;

	skb = skb_copy_expand(tx_skb, sizeof(*hdr), 0, GFP_ATOMIC);
	if (skb == NULL)
		return;

	hdr = (struct hwsim_radiotap_hdr *) skb_push(skb, sizeof(*hdr));
	hdr->hdr.it_version = PKTHDR_RADIOTAP_VERSION;
	hdr->hdr.it_pad = 0;
	hdr->hdr.it_len = cpu_to_le16(sizeof(*hdr));
	hdr->hdr.it_present = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
					  (1 << IEEE80211_RADIOTAP_RATE) |
					  (1 << IEEE80211_RADIOTAP_CHANNEL));
	hdr->rt_flags = 0;
	hdr->rt_rate = txrate->bitrate / 5;
	hdr->rt_channel = cpu_to_le16(data->channel->center_freq);
	flags = IEEE80211_CHAN_2GHZ;
	if (txrate->flags & IEEE80211_RATE_ERP_G)
		flags |= IEEE80211_CHAN_OFDM;
	else
		flags |= IEEE80211_CHAN_CCK;
	hdr->rt_chbitmask = cpu_to_le16(flags);

	skb->dev = hwsim_mon;
	skb_set_mac_header(skb, 0);
	skb->ip_summed = CHECKSUM_UNNECESSARY;
	skb->pkt_type = PACKET_OTHERHOST;
	skb->protocol = htons(ETH_P_802_2);
	memset(skb->cb, 0, sizeof(skb->cb));
	netif_rx(skb);
}


static void mac80211_hwsim_monitor_ack(struct ieee80211_hw *hw, const u8 *addr)
{
	struct mac80211_hwsim_data *data = hw->priv;
	struct sk_buff *skb;
	struct hwsim_radiotap_hdr *hdr;
	u16 flags;
	struct ieee80211_hdr *hdr11;

	if (!netif_running(hwsim_mon))
		return;

	skb = dev_alloc_skb(100);
	if (skb == NULL)
		return;

	hdr = (struct hwsim_radiotap_hdr *) skb_put(skb, sizeof(*hdr));
	hdr->hdr.it_version = PKTHDR_RADIOTAP_VERSION;
	hdr->hdr.it_pad = 0;
	hdr->hdr.it_len = cpu_to_le16(sizeof(*hdr));
	hdr->hdr.it_present = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
					  (1 << IEEE80211_RADIOTAP_CHANNEL));
	hdr->rt_flags = 0;
	hdr->rt_rate = 0;
	hdr->rt_channel = cpu_to_le16(data->channel->center_freq);
	flags = IEEE80211_CHAN_2GHZ;
	hdr->rt_chbitmask = cpu_to_le16(flags);

	hdr11 = (struct ieee80211_hdr *) skb_put(skb, 10);
	hdr11->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
					   IEEE80211_STYPE_ACK);
	hdr11->duration_id = cpu_to_le16(0);
	memcpy(hdr11->addr1, addr, ETH_ALEN);

	skb->dev = hwsim_mon;
	skb_set_mac_header(skb, 0);
	skb->ip_summed = CHECKSUM_UNNECESSARY;
	skb->pkt_type = PACKET_OTHERHOST;
	skb->protocol = htons(ETH_P_802_2);
	memset(skb->cb, 0, sizeof(skb->cb));
	netif_rx(skb);
}


static bool hwsim_ps_rx_ok(struct mac80211_hwsim_data *data,
			   struct sk_buff *skb)
{
	switch (data->ps) {
	case PS_DISABLED:
		return true;
	case PS_ENABLED:
		return false;
	case PS_AUTO_POLL:
		/* TODO: accept (some) Beacons by default and other frames only
		 * if pending PS-Poll has been sent */
		return true;
	case PS_MANUAL_POLL:
		/* Allow unicast frames to own address if there is a pending
		 * PS-Poll */
		if (data->ps_poll_pending &&
		    memcmp(data->hw->wiphy->perm_addr, skb->data + 4,
			   ETH_ALEN) == 0) {
			data->ps_poll_pending = false;
			return true;
		}
		return false;
	}

	return true;
}


struct mac80211_hwsim_addr_match_data {
	bool ret;
	const u8 *addr;
};

static void mac80211_hwsim_addr_iter(void *data, u8 *mac,
				     struct ieee80211_vif *vif)
{
	struct mac80211_hwsim_addr_match_data *md = data;
	if (memcmp(mac, md->addr, ETH_ALEN) == 0)
		md->ret = true;
}


static bool mac80211_hwsim_addr_match(struct mac80211_hwsim_data *data,
				      const u8 *addr)
{
	struct mac80211_hwsim_addr_match_data md;

	if (memcmp(addr, data->hw->wiphy->perm_addr, ETH_ALEN) == 0)
		return true;

	md.ret = false;
	md.addr = addr;
	ieee80211_iterate_active_interfaces_atomic(data->hw,
						   mac80211_hwsim_addr_iter,
						   &md);

	return md.ret;
}


static bool mac80211_hwsim_tx_frame(struct ieee80211_hw *hw,
				    struct sk_buff *skb)
{
	struct mac80211_hwsim_data *data = hw->priv, *data2;
	bool ack = false;
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_rx_status rx_status;

	if (data->idle) {
		wiphy_debug(hw->wiphy, "Trying to TX when idle - reject\n");
		return false;
	}

	memset(&rx_status, 0, sizeof(rx_status));
	/* TODO: set mactime */
	rx_status.freq = data->channel->center_freq;
	rx_status.band = data->channel->band;
	rx_status.rate_idx = info->control.rates[0].idx;
	/* TODO: simulate real signal strength (and optional packet loss) */
	rx_status.signal = data->power_level - 50;

	if (data->ps != PS_DISABLED)
		hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);

	/* release the skb's source info */
	skb_orphan(skb);
	skb_dst_drop(skb);
	skb->mark = 0;
	secpath_reset(skb);
	nf_reset(skb);

	/* Copy skb to all enabled radios that are on the current frequency */
	spin_lock(&hwsim_radio_lock);
	list_for_each_entry(data2, &hwsim_radios, list) {
		struct sk_buff *nskb;

		if (data == data2)
			continue;

		if (data2->idle || !data2->started ||
		    !hwsim_ps_rx_ok(data2, skb) ||
		    !data->channel || !data2->channel ||
		    data->channel->center_freq != data2->channel->center_freq ||
		    !(data->group & data2->group))
			continue;

		nskb = skb_copy(skb, GFP_ATOMIC);
		if (nskb == NULL)
			continue;

		if (mac80211_hwsim_addr_match(data2, hdr->addr1))
			ack = true;
		memcpy(IEEE80211_SKB_RXCB(nskb), &rx_status, sizeof(rx_status));
		ieee80211_rx_irqsafe(data2->hw, nskb);
	}
	spin_unlock(&hwsim_radio_lock);

	return ack;
}


static int mac80211_hwsim_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
{
	bool ack;
	struct ieee80211_tx_info *txi;

	mac80211_hwsim_monitor_rx(hw, skb);

	if (skb->len < 10) {
		/* Should not happen; just a sanity check for addr1 use */
		dev_kfree_skb(skb);
		return NETDEV_TX_OK;
	}

	ack = mac80211_hwsim_tx_frame(hw, skb);
	if (ack && skb->len >= 16) {
		struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
		mac80211_hwsim_monitor_ack(hw, hdr->addr2);
	}

	txi = IEEE80211_SKB_CB(skb);

	if (txi->control.vif)
		hwsim_check_magic(txi->control.vif);
	if (txi->control.sta)
		hwsim_check_sta_magic(txi->control.sta);

	ieee80211_tx_info_clear_status(txi);
	if (!(txi->flags & IEEE80211_TX_CTL_NO_ACK) && ack)
		txi->flags |= IEEE80211_TX_STAT_ACK;
	ieee80211_tx_status_irqsafe(hw, skb);
	return NETDEV_TX_OK;
}


static int mac80211_hwsim_start(struct ieee80211_hw *hw)
{
	struct mac80211_hwsim_data *data = hw->priv;
	wiphy_debug(hw->wiphy, "%s\n", __func__);
	data->started = 1;
	return 0;
}


static void mac80211_hwsim_stop(struct ieee80211_hw *hw)
{
	struct mac80211_hwsim_data *data = hw->priv;
	data->started = 0;
	del_timer(&data->beacon_timer);
	wiphy_debug(hw->wiphy, "%s\n", __func__);
}


static int mac80211_hwsim_add_interface(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif)
{
	wiphy_debug(hw->wiphy, "%s (type=%d mac_addr=%pM)\n",
		    __func__, ieee80211_vif_type_p2p(vif),
		    vif->addr);
	hwsim_set_magic(vif);
	return 0;
}


static int mac80211_hwsim_change_interface(struct ieee80211_hw *hw,
					   struct ieee80211_vif *vif,
					   enum nl80211_iftype newtype,
					   bool newp2p)
{
	newtype = ieee80211_iftype_p2p(newtype, newp2p);
	wiphy_debug(hw->wiphy,
		    "%s (old type=%d, new type=%d, mac_addr=%pM)\n",
		    __func__, ieee80211_vif_type_p2p(vif),
		    newtype, vif->addr);
	hwsim_check_magic(vif);

	return 0;
}

static void mac80211_hwsim_remove_interface(
	struct ieee80211_hw *hw, struct ieee80211_vif *vif)
{
	wiphy_debug(hw->wiphy, "%s (type=%d mac_addr=%pM)\n",
		    __func__, ieee80211_vif_type_p2p(vif),
		    vif->addr);
	hwsim_check_magic(vif);
	hwsim_clear_magic(vif);
}


static void mac80211_hwsim_beacon_tx(void *arg, u8 *mac,
				     struct ieee80211_vif *vif)
{
	struct ieee80211_hw *hw = arg;
	struct sk_buff *skb;
	struct ieee80211_tx_info *info;

	hwsim_check_magic(vif);

	if (vif->type != NL80211_IFTYPE_AP &&
	    vif->type != NL80211_IFTYPE_MESH_POINT &&
	    vif->type != NL80211_IFTYPE_ADHOC)
		return;

	skb = ieee80211_beacon_get(hw, vif);
	if (skb == NULL)
		return;
	info = IEEE80211_SKB_CB(skb);

	mac80211_hwsim_monitor_rx(hw, skb);
	mac80211_hwsim_tx_frame(hw, skb);
	dev_kfree_skb(skb);
}


static void mac80211_hwsim_beacon(unsigned long arg)
{
	struct ieee80211_hw *hw = (struct ieee80211_hw *) arg;
	struct mac80211_hwsim_data *data = hw->priv;

	if (!data->started)
		return;

	ieee80211_iterate_active_interfaces_atomic(
		hw, mac80211_hwsim_beacon_tx, hw);

	data->beacon_timer.expires = jiffies + data->beacon_int;
	add_timer(&data->beacon_timer);
}

static const char *hwsim_chantypes[] = {
	[NL80211_CHAN_NO_HT] = "noht",
	[NL80211_CHAN_HT20] = "ht20",
	[NL80211_CHAN_HT40MINUS] = "ht40-",
	[NL80211_CHAN_HT40PLUS] = "ht40+",
};

static int mac80211_hwsim_config(struct ieee80211_hw *hw, u32 changed)
{
	struct mac80211_hwsim_data *data = hw->priv;
	struct ieee80211_conf *conf = &hw->conf;
	static const char *smps_modes[IEEE80211_SMPS_NUM_MODES] = {
		[IEEE80211_SMPS_AUTOMATIC] = "auto",
		[IEEE80211_SMPS_OFF] = "off",
		[IEEE80211_SMPS_STATIC] = "static",
		[IEEE80211_SMPS_DYNAMIC] = "dynamic",
	};

	wiphy_debug(hw->wiphy,
		    "%s (freq=%d/%s idle=%d ps=%d smps=%s)\n",
		    __func__,
		    conf->channel->center_freq,
		    hwsim_chantypes[conf->channel_type],
		    !!(conf->flags & IEEE80211_CONF_IDLE),
		    !!(conf->flags & IEEE80211_CONF_PS),
		    smps_modes[conf->smps_mode]);

	data->idle = !!(conf->flags & IEEE80211_CONF_IDLE);

	data->channel = conf->channel;
	data->power_level = conf->power_level;
	if (!data->started || !data->beacon_int)
		del_timer(&data->beacon_timer);
	else
		mod_timer(&data->beacon_timer, jiffies + data->beacon_int);

	return 0;
}


static void mac80211_hwsim_configure_filter(struct ieee80211_hw *hw,
					    unsigned int changed_flags,
					    unsigned int *total_flags,u64 multicast)
{
	struct mac80211_hwsim_data *data = hw->priv;

	wiphy_debug(hw->wiphy, "%s\n", __func__);

	data->rx_filter = 0;
	if (*total_flags & FIF_PROMISC_IN_BSS)
		data->rx_filter |= FIF_PROMISC_IN_BSS;
	if (*total_flags & FIF_ALLMULTI)
		data->rx_filter |= FIF_ALLMULTI;

	*total_flags = data->rx_filter;
}

static void mac80211_hwsim_bss_info_changed(struct ieee80211_hw *hw,
					    struct ieee80211_vif *vif,
					    struct ieee80211_bss_conf *info,
					    u32 changed)
{
	struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
	struct mac80211_hwsim_data *data = hw->priv;

	hwsim_check_magic(vif);

	wiphy_debug(hw->wiphy, "%s(changed=0x%x)\n", __func__, changed);

	if (changed & BSS_CHANGED_BSSID) {
		wiphy_debug(hw->wiphy, "%s: BSSID changed: %pM\n",
			    __func__, info->bssid);
		memcpy(vp->bssid, info->bssid, ETH_ALEN);
	}

	if (changed & BSS_CHANGED_ASSOC) {
		wiphy_debug(hw->wiphy, "  ASSOC: assoc=%d aid=%d\n",
			    info->assoc, info->aid);
		vp->assoc = info->assoc;
		vp->aid = info->aid;
	}

	if (changed & BSS_CHANGED_BEACON_INT) {
		wiphy_debug(hw->wiphy, "  BCNINT: %d\n", info->beacon_int);
		data->beacon_int = 1024 * info->beacon_int / 1000 * HZ / 1000;
		if (WARN_ON(!data->beacon_int))
			data->beacon_int = 1;
		if (data->started)
			mod_timer(&data->beacon_timer,
				  jiffies + data->beacon_int);
	}

	if (changed & BSS_CHANGED_ERP_CTS_PROT) {
		wiphy_debug(hw->wiphy, "  ERP_CTS_PROT: %d\n",
			    info->use_cts_prot);
	}

	if (changed & BSS_CHANGED_ERP_PREAMBLE) {
		wiphy_debug(hw->wiphy, "  ERP_PREAMBLE: %d\n",
			    info->use_short_preamble);
	}

	if (changed & BSS_CHANGED_ERP_SLOT) {
		wiphy_debug(hw->wiphy, "  ERP_SLOT: %d\n", info->use_short_slot);
	}

	if (changed & BSS_CHANGED_HT) {
		wiphy_debug(hw->wiphy, "  HT: op_mode=0x%x, chantype=%s\n",
			    info->ht_operation_mode,
			    hwsim_chantypes[info->channel_type]);
	}

	if (changed & BSS_CHANGED_BASIC_RATES) {
		wiphy_debug(hw->wiphy, "  BASIC_RATES: 0x%llx\n",
			    (unsigned long long) info->basic_rates);
	}
}

static int mac80211_hwsim_sta_add(struct ieee80211_hw *hw,
				  struct ieee80211_vif *vif,
				  struct ieee80211_sta *sta)
{
	hwsim_check_magic(vif);
	hwsim_set_sta_magic(sta);

	return 0;
}

static int mac80211_hwsim_sta_remove(struct ieee80211_hw *hw,
				     struct ieee80211_vif *vif,
				     struct ieee80211_sta *sta)
{
	hwsim_check_magic(vif);
	hwsim_clear_sta_magic(sta);

	return 0;
}

static void mac80211_hwsim_sta_notify(struct ieee80211_hw *hw,
				      struct ieee80211_vif *vif,
				      enum sta_notify_cmd cmd,
				      struct ieee80211_sta *sta)
{
	hwsim_check_magic(vif);

	switch (cmd) {
	case STA_NOTIFY_SLEEP:
	case STA_NOTIFY_AWAKE:
		/* TODO: make good use of these flags */
		break;
	default:
		WARN(1, "Invalid sta notify: %d\n", cmd);
		break;
	}
}

static int mac80211_hwsim_set_tim(struct ieee80211_hw *hw,
				  struct ieee80211_sta *sta,
				  bool set)
{
	hwsim_check_sta_magic(sta);
	return 0;
}

static int mac80211_hwsim_conf_tx(
	struct ieee80211_hw *hw, u16 queue,
	const struct ieee80211_tx_queue_params *params)
{
	wiphy_debug(hw->wiphy,
		    "%s (queue=%d txop=%d cw_min=%d cw_max=%d aifs=%d)\n",
		    __func__, queue,
		    params->txop, params->cw_min,
		    params->cw_max, params->aifs);
	return 0;
}

static int mac80211_hwsim_get_survey(
	struct ieee80211_hw *hw, int idx,
	struct survey_info *survey)
{
	struct ieee80211_conf *conf = &hw->conf;

	wiphy_debug(hw->wiphy, "%s (idx=%d)\n", __func__, idx);

	if (idx != 0)
		return -ENOENT;

	/* Current channel */
	survey->channel = conf->channel;

	/*
	 * Magically conjured noise level --- this is only ok for simulated hardware.
	 *
	 * A real driver which cannot determine the real channel noise MUST NOT
	 * report any noise, especially not a magically conjured one :-)
	 */
	survey->filled = SURVEY_INFO_NOISE_DBM;
	survey->noise = -92;

	return 0;
}

#ifdef CONFIG_NL80211_TESTMODE
/*
 * This section contains example code for using netlink
 * attributes with the testmode command in nl80211.
 */

/* These enums need to be kept in sync with userspace */
enum hwsim_testmode_attr {
	__HWSIM_TM_ATTR_INVALID	= 0,
	HWSIM_TM_ATTR_CMD	= 1,
	HWSIM_TM_ATTR_PS	= 2,

	/* keep last */
	__HWSIM_TM_ATTR_AFTER_LAST,
	HWSIM_TM_ATTR_MAX	= __HWSIM_TM_ATTR_AFTER_LAST - 1
};

enum hwsim_testmode_cmd {
	HWSIM_TM_CMD_SET_PS		= 0,
	HWSIM_TM_CMD_GET_PS		= 1,
};

static const struct nla_policy hwsim_testmode_policy[HWSIM_TM_ATTR_MAX + 1] = {
	[HWSIM_TM_ATTR_CMD] = { .type = NLA_U32 },
	[HWSIM_TM_ATTR_PS] = { .type = NLA_U32 },
};

static int hwsim_fops_ps_write(void *dat, u64 val);

static int mac80211_hwsim_testmode_cmd(struct ieee80211_hw *hw,
				       void *data, int len)
{
	struct mac80211_hwsim_data *hwsim = hw->priv;
	struct nlattr *tb[HWSIM_TM_ATTR_MAX + 1];
	struct sk_buff *skb;
	int err, ps;

	err = nla_parse(tb, HWSIM_TM_ATTR_MAX, data, len,
			hwsim_testmode_policy);
	if (err)
		return err;

	if (!tb[HWSIM_TM_ATTR_CMD])
		return -EINVAL;

	switch (nla_get_u32(tb[HWSIM_TM_ATTR_CMD])) {
	case HWSIM_TM_CMD_SET_PS:
		if (!tb[HWSIM_TM_ATTR_PS])
			return -EINVAL;
		ps = nla_get_u32(tb[HWSIM_TM_ATTR_PS]);
		return hwsim_fops_ps_write(hwsim, ps);
	case HWSIM_TM_CMD_GET_PS:
		skb = cfg80211_testmode_alloc_reply_skb(hw->wiphy,
						nla_total_size(sizeof(u32)));
		if (!skb)
			return -ENOMEM;
		NLA_PUT_U32(skb, HWSIM_TM_ATTR_PS, hwsim->ps);
		return cfg80211_testmode_reply(skb);
	default:
		return -EOPNOTSUPP;
	}

 nla_put_failure:
	kfree_skb(skb);
	return -ENOBUFS;
}
#endif

static int mac80211_hwsim_ampdu_action(struct ieee80211_hw *hw,
				       struct ieee80211_vif *vif,
				       enum ieee80211_ampdu_mlme_action action,
				       struct ieee80211_sta *sta, u16 tid, u16 *ssn)
{
	switch (action) {
	case IEEE80211_AMPDU_TX_START:
		ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
		break;
	case IEEE80211_AMPDU_TX_STOP:
		ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
		break;
	case IEEE80211_AMPDU_TX_OPERATIONAL:
		break;
	case IEEE80211_AMPDU_RX_START:
	case IEEE80211_AMPDU_RX_STOP:
		break;
	default:
		return -EOPNOTSUPP;
	}

	return 0;
}

static void mac80211_hwsim_flush(struct ieee80211_hw *hw, bool drop)
{
	/*
	 * In this special case, there's nothing we need to
	 * do because hwsim does transmission synchronously.
	 * In the future, when it does transmissions via
	 * userspace, we may need to do something.
	 */
}

struct hw_scan_done {
	struct delayed_work w;
	struct ieee80211_hw *hw;
};

static void hw_scan_done(struct work_struct *work)
{
	struct hw_scan_done *hsd =
		container_of(work, struct hw_scan_done, w.work);

	ieee80211_scan_completed(hsd->hw, false);
	kfree(hsd);
}

static int mac80211_hwsim_hw_scan(struct ieee80211_hw *hw,
				  struct ieee80211_vif *vif,
				  struct cfg80211_scan_request *req)
{
	struct hw_scan_done *hsd = kzalloc(sizeof(*hsd), GFP_KERNEL);
	int i;

	if (!hsd)
		return -ENOMEM;

	hsd->hw = hw;
	INIT_DELAYED_WORK(&hsd->w, hw_scan_done);

	printk(KERN_DEBUG "hwsim hw_scan request\n");
	for (i = 0; i < req->n_channels; i++)
		printk(KERN_DEBUG "hwsim hw_scan freq %d\n",
			req->channels[i]->center_freq);

	ieee80211_queue_delayed_work(hw, &hsd->w, 2 * HZ);

	return 0;
}

static void mac80211_hwsim_sw_scan(struct ieee80211_hw *hw)
{
	struct mac80211_hwsim_data *hwsim = hw->priv;

	mutex_lock(&hwsim->mutex);

	if (hwsim->scanning) {
		printk(KERN_DEBUG "two hwsim sw_scans detected!\n");
		goto out;
	}

	printk(KERN_DEBUG "hwsim sw_scan request, prepping stuff\n");
	hwsim->scanning = true;

out:
	mutex_unlock(&hwsim->mutex);
}

static void mac80211_hwsim_sw_scan_complete(struct ieee80211_hw *hw)
{
	struct mac80211_hwsim_data *hwsim = hw->priv;

	mutex_lock(&hwsim->mutex);

	printk(KERN_DEBUG "hwsim sw_scan_complete\n");
	hwsim->scanning = false;

	mutex_unlock(&hwsim->mutex);
}

static struct ieee80211_ops mac80211_hwsim_ops =
{
	.tx = mac80211_hwsim_tx,
	.start = mac80211_hwsim_start,
	.stop = mac80211_hwsim_stop,
	.add_interface = mac80211_hwsim_add_interface,
	.change_interface = mac80211_hwsim_change_interface,
	.remove_interface = mac80211_hwsim_remove_interface,
	.config = mac80211_hwsim_config,
	.configure_filter = mac80211_hwsim_configure_filter,
	.bss_info_changed = mac80211_hwsim_bss_info_changed,
	.sta_add = mac80211_hwsim_sta_add,
	.sta_remove = mac80211_hwsim_sta_remove,
	.sta_notify = mac80211_hwsim_sta_notify,
	.set_tim = mac80211_hwsim_set_tim,
	.conf_tx = mac80211_hwsim_conf_tx,
	.get_survey = mac80211_hwsim_get_survey,
	CFG80211_TESTMODE_CMD(mac80211_hwsim_testmode_cmd)
	.ampdu_action = mac80211_hwsim_ampdu_action,
	.sw_scan_start = mac80211_hwsim_sw_scan,
	.sw_scan_complete = mac80211_hwsim_sw_scan_complete,
	.flush = mac80211_hwsim_flush,
};


static void mac80211_hwsim_free(void)
{
	struct list_head tmplist, *i, *tmp;
	struct mac80211_hwsim_data *data, *tmpdata;

	INIT_LIST_HEAD(&tmplist);

	spin_lock_bh(&hwsim_radio_lock);
	list_for_each_safe(i, tmp, &hwsim_radios)
		list_move(i, &tmplist);
	spin_unlock_bh(&hwsim_radio_lock);

	list_for_each_entry_safe(data, tmpdata, &tmplist, list) {
		debugfs_remove(data->debugfs_group);
		debugfs_remove(data->debugfs_ps);
		debugfs_remove(data->debugfs);
		ieee80211_unregister_hw(data->hw);
		device_unregister(data->dev);
		ieee80211_free_hw(data->hw);
	}
	class_destroy(hwsim_class);
}


static struct device_driver mac80211_hwsim_driver = {
	.name = "mac80211_hwsim"
};

static const struct net_device_ops hwsim_netdev_ops = {
	.ndo_start_xmit 	= hwsim_mon_xmit,
	.ndo_change_mtu		= eth_change_mtu,
	.ndo_set_mac_address 	= eth_mac_addr,
	.ndo_validate_addr	= eth_validate_addr,
};

static void hwsim_mon_setup(struct net_device *dev)
{
	dev->netdev_ops = &hwsim_netdev_ops;
	dev->destructor = free_netdev;
	ether_setup(dev);
	dev->tx_queue_len = 0;
	dev->type = ARPHRD_IEEE80211_RADIOTAP;
	memset(dev->dev_addr, 0, ETH_ALEN);
	dev->dev_addr[0] = 0x12;
}


static void hwsim_send_ps_poll(void *dat, u8 *mac, struct ieee80211_vif *vif)
{
	struct mac80211_hwsim_data *data = dat;
	struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
	struct sk_buff *skb;
	struct ieee80211_pspoll *pspoll;

	if (!vp->assoc)
		return;

	wiphy_debug(data->hw->wiphy,
		    "%s: send PS-Poll to %pM for aid %d\n",
		    __func__, vp->bssid, vp->aid);

	skb = dev_alloc_skb(sizeof(*pspoll));
	if (!skb)
		return;
	pspoll = (void *) skb_put(skb, sizeof(*pspoll));
	pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
					    IEEE80211_STYPE_PSPOLL |
					    IEEE80211_FCTL_PM);
	pspoll->aid = cpu_to_le16(0xc000 | vp->aid);
	memcpy(pspoll->bssid, vp->bssid, ETH_ALEN);
	memcpy(pspoll->ta, mac, ETH_ALEN);
	if (!mac80211_hwsim_tx_frame(data->hw, skb))
		printk(KERN_DEBUG "%s: PS-Poll frame not ack'ed\n", __func__);
	dev_kfree_skb(skb);
}


static void hwsim_send_nullfunc(struct mac80211_hwsim_data *data, u8 *mac,
				struct ieee80211_vif *vif, int ps)
{
	struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
	struct sk_buff *skb;
	struct ieee80211_hdr *hdr;

	if (!vp->assoc)
		return;

	wiphy_debug(data->hw->wiphy,
		    "%s: send data::nullfunc to %pM ps=%d\n",
		    __func__, vp->bssid, ps);

	skb = dev_alloc_skb(sizeof(*hdr));
	if (!skb)
		return;
	hdr = (void *) skb_put(skb, sizeof(*hdr) - ETH_ALEN);
	hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
					 IEEE80211_STYPE_NULLFUNC |
					 (ps ? IEEE80211_FCTL_PM : 0));
	hdr->duration_id = cpu_to_le16(0);
	memcpy(hdr->addr1, vp->bssid, ETH_ALEN);
	memcpy(hdr->addr2, mac, ETH_ALEN);
	memcpy(hdr->addr3, vp->bssid, ETH_ALEN);
	if (!mac80211_hwsim_tx_frame(data->hw, skb))
		printk(KERN_DEBUG "%s: nullfunc frame not ack'ed\n", __func__);
	dev_kfree_skb(skb);
}


static void hwsim_send_nullfunc_ps(void *dat, u8 *mac,
				   struct ieee80211_vif *vif)
{
	struct mac80211_hwsim_data *data = dat;
	hwsim_send_nullfunc(data, mac, vif, 1);
}


static void hwsim_send_nullfunc_no_ps(void *dat, u8 *mac,
				      struct ieee80211_vif *vif)
{
	struct mac80211_hwsim_data *data = dat;
	hwsim_send_nullfunc(data, mac, vif, 0);
}


static int hwsim_fops_ps_read(void *dat, u64 *val)
{
	struct mac80211_hwsim_data *data = dat;
	*val = data->ps;
	return 0;
}

static int hwsim_fops_ps_write(void *dat, u64 val)
{
	struct mac80211_hwsim_data *data = dat;
	enum ps_mode old_ps;

	if (val != PS_DISABLED && val != PS_ENABLED && val != PS_AUTO_POLL &&
	    val != PS_MANUAL_POLL)
		return -EINVAL;

	old_ps = data->ps;
	data->ps = val;

	if (val == PS_MANUAL_POLL) {
		ieee80211_iterate_active_interfaces(data->hw,
						    hwsim_send_ps_poll, data);
		data->ps_poll_pending = true;
	} else if (old_ps == PS_DISABLED && val != PS_DISABLED) {
		ieee80211_iterate_active_interfaces(data->hw,
						    hwsim_send_nullfunc_ps,
						    data);
	} else if (old_ps != PS_DISABLED && val == PS_DISABLED) {
		ieee80211_iterate_active_interfaces(data->hw,
						    hwsim_send_nullfunc_no_ps,
						    data);
	}

	return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(hwsim_fops_ps, hwsim_fops_ps_read, hwsim_fops_ps_write,
			"%llu\n");


static int hwsim_fops_group_read(void *dat, u64 *val)
{
	struct mac80211_hwsim_data *data = dat;
	*val = data->group;
	return 0;
}

static int hwsim_fops_group_write(void *dat, u64 val)
{
	struct mac80211_hwsim_data *data = dat;
	data->group = val;
	return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(hwsim_fops_group,
			hwsim_fops_group_read, hwsim_fops_group_write,
			"%llx\n");

static int __init init_mac80211_hwsim(void)
{
	int i, err = 0;
	u8 addr[ETH_ALEN];
	struct mac80211_hwsim_data *data;
	struct ieee80211_hw *hw;
	enum ieee80211_band band;

	if (radios < 1 || radios > 100)
		return -EINVAL;

	if (fake_hw_scan) {
		mac80211_hwsim_ops.hw_scan = mac80211_hwsim_hw_scan;
		mac80211_hwsim_ops.sw_scan_start = NULL;
		mac80211_hwsim_ops.sw_scan_complete = NULL;
	}

	spin_lock_init(&hwsim_radio_lock);
	INIT_LIST_HEAD(&hwsim_radios);

	hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
	if (IS_ERR(hwsim_class))
		return PTR_ERR(hwsim_class);

	memset(addr, 0, ETH_ALEN);
	addr[0] = 0x02;

	for (i = 0; i < radios; i++) {
		printk(KERN_DEBUG "mac80211_hwsim: Initializing radio %d\n",
		       i);
		hw = ieee80211_alloc_hw(sizeof(*data), &mac80211_hwsim_ops);
		if (!hw) {
			printk(KERN_DEBUG "mac80211_hwsim: ieee80211_alloc_hw "
			       "failed\n");
			err = -ENOMEM;
			goto failed;
		}
		data = hw->priv;
		data->hw = hw;

		data->dev = device_create(hwsim_class, NULL, 0, hw,
					  "hwsim%d", i);
		if (IS_ERR(data->dev)) {
			printk(KERN_DEBUG
			       "mac80211_hwsim: device_create "
			       "failed (%ld)\n", PTR_ERR(data->dev));
			err = -ENOMEM;
			goto failed_drvdata;
		}
		data->dev->driver = &mac80211_hwsim_driver;

		SET_IEEE80211_DEV(hw, data->dev);
		addr[3] = i >> 8;
		addr[4] = i;
		memcpy(data->addresses[0].addr, addr, ETH_ALEN);
		memcpy(data->addresses[1].addr, addr, ETH_ALEN);
		data->addresses[1].addr[0] |= 0x40;
		hw->wiphy->n_addresses = 2;
		hw->wiphy->addresses = data->addresses;

		if (fake_hw_scan) {
			hw->wiphy->max_scan_ssids = 255;
			hw->wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
		}

		hw->channel_change_time = 1;
		hw->queues = 4;
		hw->wiphy->interface_modes =
			BIT(NL80211_IFTYPE_STATION) |
			BIT(NL80211_IFTYPE_AP) |
			BIT(NL80211_IFTYPE_P2P_CLIENT) |
			BIT(NL80211_IFTYPE_P2P_GO) |
			BIT(NL80211_IFTYPE_ADHOC) |
			BIT(NL80211_IFTYPE_MESH_POINT);

		hw->flags = IEEE80211_HW_MFP_CAPABLE |
			    IEEE80211_HW_SIGNAL_DBM |
			    IEEE80211_HW_SUPPORTS_STATIC_SMPS |
			    IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS |
			    IEEE80211_HW_AMPDU_AGGREGATION;

		/* ask mac80211 to reserve space for magic */
		hw->vif_data_size = sizeof(struct hwsim_vif_priv);
		hw->sta_data_size = sizeof(struct hwsim_sta_priv);

		memcpy(data->channels_2ghz, hwsim_channels_2ghz,
			sizeof(hwsim_channels_2ghz));
		memcpy(data->channels_5ghz, hwsim_channels_5ghz,
			sizeof(hwsim_channels_5ghz));
		memcpy(data->rates, hwsim_rates, sizeof(hwsim_rates));

		for (band = IEEE80211_BAND_2GHZ; band < IEEE80211_NUM_BANDS; band++) {
			struct ieee80211_supported_band *sband = &data->bands[band];
			switch (band) {
			case IEEE80211_BAND_2GHZ:
				sband->channels = data->channels_2ghz;
				sband->n_channels =
					ARRAY_SIZE(hwsim_channels_2ghz);
				sband->bitrates = data->rates;
				sband->n_bitrates = ARRAY_SIZE(hwsim_rates);
				break;
			case IEEE80211_BAND_5GHZ:
				sband->channels = data->channels_5ghz;
				sband->n_channels =
					ARRAY_SIZE(hwsim_channels_5ghz);
				sband->bitrates = data->rates + 4;
				sband->n_bitrates = ARRAY_SIZE(hwsim_rates) - 4;
				break;
			default:
				break;
			}

			sband->ht_cap.ht_supported = true;
			sband->ht_cap.cap = IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
				IEEE80211_HT_CAP_GRN_FLD |
				IEEE80211_HT_CAP_SGI_40 |
				IEEE80211_HT_CAP_DSSSCCK40;
			sband->ht_cap.ampdu_factor = 0x3;
			sband->ht_cap.ampdu_density = 0x6;
			memset(&sband->ht_cap.mcs, 0,
			       sizeof(sband->ht_cap.mcs));
			sband->ht_cap.mcs.rx_mask[0] = 0xff;
			sband->ht_cap.mcs.rx_mask[1] = 0xff;
			sband->ht_cap.mcs.tx_params = IEEE80211_HT_MCS_TX_DEFINED;

			hw->wiphy->bands[band] = sband;
		}
		/* By default all radios are belonging to the first group */
		data->group = 1;
		mutex_init(&data->mutex);

		/* Work to be done prior to ieee80211_register_hw() */
		switch (regtest) {
		case HWSIM_REGTEST_DISABLED:
		case HWSIM_REGTEST_DRIVER_REG_FOLLOW:
		case HWSIM_REGTEST_DRIVER_REG_ALL:
		case HWSIM_REGTEST_DIFF_COUNTRY:
			/*
			 * Nothing to be done for driver regulatory domain
			 * hints prior to ieee80211_register_hw()
			 */
			break;
		case HWSIM_REGTEST_WORLD_ROAM:
			if (i == 0) {
				hw->wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
				wiphy_apply_custom_regulatory(hw->wiphy,
					&hwsim_world_regdom_custom_01);
			}
			break;
		case HWSIM_REGTEST_CUSTOM_WORLD:
			hw->wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
			wiphy_apply_custom_regulatory(hw->wiphy,
				&hwsim_world_regdom_custom_01);
			break;
		case HWSIM_REGTEST_CUSTOM_WORLD_2:
			if (i == 0) {
				hw->wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
				wiphy_apply_custom_regulatory(hw->wiphy,
					&hwsim_world_regdom_custom_01);
			} else if (i == 1) {
				hw->wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
				wiphy_apply_custom_regulatory(hw->wiphy,
					&hwsim_world_regdom_custom_02);
			}
			break;
		case HWSIM_REGTEST_STRICT_ALL:
			hw->wiphy->flags |= WIPHY_FLAG_STRICT_REGULATORY;
			break;
		case HWSIM_REGTEST_STRICT_FOLLOW:
		case HWSIM_REGTEST_STRICT_AND_DRIVER_REG:
			if (i == 0)
				hw->wiphy->flags |= WIPHY_FLAG_STRICT_REGULATORY;
			break;
		case HWSIM_REGTEST_ALL:
			if (i == 0) {
				hw->wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
				wiphy_apply_custom_regulatory(hw->wiphy,
					&hwsim_world_regdom_custom_01);
			} else if (i == 1) {
				hw->wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
				wiphy_apply_custom_regulatory(hw->wiphy,
					&hwsim_world_regdom_custom_02);
			} else if (i == 4)
				hw->wiphy->flags |= WIPHY_FLAG_STRICT_REGULATORY;
			break;
		default:
			break;
		}

		/* give the regulatory workqueue a chance to run */
		if (regtest)
			schedule_timeout_interruptible(1);
		err = ieee80211_register_hw(hw);
		if (err < 0) {
			printk(KERN_DEBUG "mac80211_hwsim: "
			       "ieee80211_register_hw failed (%d)\n", err);
			goto failed_hw;
		}

		/* Work to be done after to ieee80211_register_hw() */
		switch (regtest) {
		case HWSIM_REGTEST_WORLD_ROAM:
		case HWSIM_REGTEST_DISABLED:
			break;
		case HWSIM_REGTEST_DRIVER_REG_FOLLOW:
			if (!i)
				regulatory_hint(hw->wiphy, hwsim_alpha2s[0]);
			break;
		case HWSIM_REGTEST_DRIVER_REG_ALL:
		case HWSIM_REGTEST_STRICT_ALL:
			regulatory_hint(hw->wiphy, hwsim_alpha2s[0]);
			break;
		case HWSIM_REGTEST_DIFF_COUNTRY:
			if (i < ARRAY_SIZE(hwsim_alpha2s))
				regulatory_hint(hw->wiphy, hwsim_alpha2s[i]);
			break;
		case HWSIM_REGTEST_CUSTOM_WORLD:
		case HWSIM_REGTEST_CUSTOM_WORLD_2:
			/*
			 * Nothing to be done for custom world regulatory
			 * domains after to ieee80211_register_hw
			 */
			break;
		case HWSIM_REGTEST_STRICT_FOLLOW:
			if (i == 0)
				regulatory_hint(hw->wiphy, hwsim_alpha2s[0]);
			break;
		case HWSIM_REGTEST_STRICT_AND_DRIVER_REG:
			if (i == 0)
				regulatory_hint(hw->wiphy, hwsim_alpha2s[0]);
			else if (i == 1)
				regulatory_hint(hw->wiphy, hwsim_alpha2s[1]);
			break;
		case HWSIM_REGTEST_ALL:
			if (i == 2)
				regulatory_hint(hw->wiphy, hwsim_alpha2s[0]);
			else if (i == 3)
				regulatory_hint(hw->wiphy, hwsim_alpha2s[1]);
			else if (i == 4)
				regulatory_hint(hw->wiphy, hwsim_alpha2s[2]);
			break;
		default:
			break;
		}

		wiphy_debug(hw->wiphy, "hwaddr %pm registered\n",
			    hw->wiphy->perm_addr);

		data->debugfs = debugfs_create_dir("hwsim",
						   hw->wiphy->debugfsdir);
		data->debugfs_ps = debugfs_create_file("ps", 0666,
						       data->debugfs, data,
						       &hwsim_fops_ps);
		data->debugfs_group = debugfs_create_file("group", 0666,
							data->debugfs, data,
							&hwsim_fops_group);

		setup_timer(&data->beacon_timer, mac80211_hwsim_beacon,
			    (unsigned long) hw);

		list_add_tail(&data->list, &hwsim_radios);
	}

	hwsim_mon = alloc_netdev(0, "hwsim%d", hwsim_mon_setup);
	if (hwsim_mon == NULL)
		goto failed;

	rtnl_lock();

	err = dev_alloc_name(hwsim_mon, hwsim_mon->name);
	if (err < 0)
		goto failed_mon;


	err = register_netdevice(hwsim_mon);
	if (err < 0)
		goto failed_mon;

	rtnl_unlock();

	return 0;

failed_mon:
	rtnl_unlock();
	free_netdev(hwsim_mon);
	mac80211_hwsim_free();
	return err;

failed_hw:
	device_unregister(data->dev);
failed_drvdata:
	ieee80211_free_hw(hw);
failed:
	mac80211_hwsim_free();
	return err;
}


static void __exit exit_mac80211_hwsim(void)
{
	printk(KERN_DEBUG "mac80211_hwsim: unregister radios\n");

	mac80211_hwsim_free();
	unregister_netdev(hwsim_mon);
}


module_init(init_mac80211_hwsim);
module_exit(exit_mac80211_hwsim);