summaryrefslogtreecommitdiffstats
path: root/net/wireless/wext.c
blob: b8069afe0410b89777cb641fa6d883a0ceaa720a (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
/*
 * This file implement the Wireless Extensions APIs.
 *
 * Authors :	Jean Tourrilhes - HPL - <jt@hpl.hp.com>
 * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
 *
 * (As all part of the Linux kernel, this file is GPL)
 */

/************************** DOCUMENTATION **************************/
/*
 * API definition :
 * --------------
 * See <linux/wireless.h> for details of the APIs and the rest.
 *
 * History :
 * -------
 *
 * v1 - 5.12.01 - Jean II
 *	o Created this file.
 *
 * v2 - 13.12.01 - Jean II
 *	o Move /proc/net/wireless stuff from net/core/dev.c to here
 *	o Make Wireless Extension IOCTLs go through here
 *	o Added iw_handler handling ;-)
 *	o Added standard ioctl description
 *	o Initial dumb commit strategy based on orinoco.c
 *
 * v3 - 19.12.01 - Jean II
 *	o Make sure we don't go out of standard_ioctl[] in ioctl_standard_call
 *	o Add event dispatcher function
 *	o Add event description
 *	o Propagate events as rtnetlink IFLA_WIRELESS option
 *	o Generate event on selected SET requests
 *
 * v4 - 18.04.02 - Jean II
 *	o Fix stupid off by one in iw_ioctl_description : IW_ESSID_MAX_SIZE + 1
 *
 * v5 - 21.06.02 - Jean II
 *	o Add IW_PRIV_TYPE_ADDR in priv_type_size (+cleanup)
 *	o Reshuffle IW_HEADER_TYPE_XXX to map IW_PRIV_TYPE_XXX changes
 *	o Add IWEVCUSTOM for driver specific event/scanning token
 *	o Turn on WE_STRICT_WRITE by default + kernel warning
 *	o Fix WE_STRICT_WRITE in ioctl_export_private() (32 => iw_num)
 *	o Fix off-by-one in test (extra_size <= IFNAMSIZ)
 *
 * v6 - 9.01.03 - Jean II
 *	o Add common spy support : iw_handler_set_spy(), wireless_spy_update()
 *	o Add enhanced spy support : iw_handler_set_thrspy() and event.
 *	o Add WIRELESS_EXT version display in /proc/net/wireless
 *
 * v6 - 18.06.04 - Jean II
 *	o Change get_spydata() method for added safety
 *	o Remove spy #ifdef, they are always on -> cleaner code
 *	o Allow any size GET request if user specifies length > max
 *		and if request has IW_DESCR_FLAG_NOMAX flag or is SIOCGIWPRIV
 *	o Start migrating get_wireless_stats to struct iw_handler_def
 *	o Add wmb() in iw_handler_set_spy() for non-coherent archs/cpus
 * Based on patch from Pavel Roskin <proski@gnu.org> :
 *	o Fix kernel data leak to user space in private handler handling
 *
 * v7 - 18.3.05 - Jean II
 *	o Remove (struct iw_point *)->pointer from events and streams
 *	o Remove spy_offset from struct iw_handler_def
 *	o Start deprecating dev->get_wireless_stats, output a warning
 *	o If IW_QUAL_DBM is set, show dBm values in /proc/net/wireless
 *	o Don't loose INVALID/DBM flags when clearing UPDATED flags (iwstats)
 *
 * v8 - 17.02.06 - Jean II
 *	o RtNetlink requests support (SET/GET)
 *
 * v8b - 03.08.06 - Herbert Xu
 *	o Fix Wireless Event locking issues.
 *
 * v9 - 14.3.06 - Jean II
 *	o Change length in ESSID and NICK to strlen() instead of strlen()+1
 *	o Make standard_ioctl_num and standard_event_num unsigned
 *	o Remove (struct net_device *)->get_wireless_stats()
 *
 * v10 - 16.3.07 - Jean II
 *	o Prevent leaking of kernel space in stream on 64 bits.
 */

/***************************** INCLUDES *****************************/

#include <linux/module.h>
#include <linux/types.h>		/* off_t */
#include <linux/netdevice.h>		/* struct ifreq, dev_get_by_name() */
#include <linux/proc_fs.h>
#include <linux/rtnetlink.h>		/* rtnetlink stuff */
#include <linux/seq_file.h>
#include <linux/init.h>			/* for __init */
#include <linux/if_arp.h>		/* ARPHRD_ETHER */
#include <linux/etherdevice.h>		/* compare_ether_addr */
#include <linux/interrupt.h>
#include <net/net_namespace.h>

#include <linux/wireless.h>		/* Pretty obvious */
#include <net/iw_handler.h>		/* New driver API */
#include <net/netlink.h>
#include <net/wext.h>

#include <asm/uaccess.h>		/* copy_to_user() */

/************************* GLOBAL VARIABLES *************************/
/*
 * You should not use global variables, because of re-entrancy.
 * On our case, it's only const, so it's OK...
 */
/*
 * Meta-data about all the standard Wireless Extension request we
 * know about.
 */
static const struct iw_ioctl_description standard_ioctl[] = {
	[SIOCSIWCOMMIT	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_NULL,
	},
	[SIOCGIWNAME	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_CHAR,
		.flags		= IW_DESCR_FLAG_DUMP,
	},
	[SIOCSIWNWID	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
		.flags		= IW_DESCR_FLAG_EVENT,
	},
	[SIOCGIWNWID	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
		.flags		= IW_DESCR_FLAG_DUMP,
	},
	[SIOCSIWFREQ	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_FREQ,
		.flags		= IW_DESCR_FLAG_EVENT,
	},
	[SIOCGIWFREQ	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_FREQ,
		.flags		= IW_DESCR_FLAG_DUMP,
	},
	[SIOCSIWMODE	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_UINT,
		.flags		= IW_DESCR_FLAG_EVENT,
	},
	[SIOCGIWMODE	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_UINT,
		.flags		= IW_DESCR_FLAG_DUMP,
	},
	[SIOCSIWSENS	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCGIWSENS	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCSIWRANGE	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_NULL,
	},
	[SIOCGIWRANGE	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= sizeof(struct iw_range),
		.flags		= IW_DESCR_FLAG_DUMP,
	},
	[SIOCSIWPRIV	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_NULL,
	},
	[SIOCGIWPRIV	- SIOCIWFIRST] = { /* (handled directly by us) */
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= sizeof(struct iw_priv_args),
		.max_tokens	= 16,
		.flags		= IW_DESCR_FLAG_NOMAX,
	},
	[SIOCSIWSTATS	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_NULL,
	},
	[SIOCGIWSTATS	- SIOCIWFIRST] = { /* (handled directly by us) */
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= sizeof(struct iw_statistics),
		.flags		= IW_DESCR_FLAG_DUMP,
	},
	[SIOCSIWSPY	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= sizeof(struct sockaddr),
		.max_tokens	= IW_MAX_SPY,
	},
	[SIOCGIWSPY	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= sizeof(struct sockaddr) +
				  sizeof(struct iw_quality),
		.max_tokens	= IW_MAX_SPY,
	},
	[SIOCSIWTHRSPY	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= sizeof(struct iw_thrspy),
		.min_tokens	= 1,
		.max_tokens	= 1,
	},
	[SIOCGIWTHRSPY	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= sizeof(struct iw_thrspy),
		.min_tokens	= 1,
		.max_tokens	= 1,
	},
	[SIOCSIWAP	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_ADDR,
	},
	[SIOCGIWAP	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_ADDR,
		.flags		= IW_DESCR_FLAG_DUMP,
	},
	[SIOCSIWMLME	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.min_tokens	= sizeof(struct iw_mlme),
		.max_tokens	= sizeof(struct iw_mlme),
	},
	[SIOCGIWAPLIST	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= sizeof(struct sockaddr) +
				  sizeof(struct iw_quality),
		.max_tokens	= IW_MAX_AP,
		.flags		= IW_DESCR_FLAG_NOMAX,
	},
	[SIOCSIWSCAN	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.min_tokens	= 0,
		.max_tokens	= sizeof(struct iw_scan_req),
	},
	[SIOCGIWSCAN	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_SCAN_MAX_DATA,
		.flags		= IW_DESCR_FLAG_NOMAX,
	},
	[SIOCSIWESSID	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_ESSID_MAX_SIZE,
		.flags		= IW_DESCR_FLAG_EVENT,
	},
	[SIOCGIWESSID	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_ESSID_MAX_SIZE,
		.flags		= IW_DESCR_FLAG_DUMP,
	},
	[SIOCSIWNICKN	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_ESSID_MAX_SIZE,
	},
	[SIOCGIWNICKN	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_ESSID_MAX_SIZE,
	},
	[SIOCSIWRATE	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCGIWRATE	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCSIWRTS	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCGIWRTS	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCSIWFRAG	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCGIWFRAG	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCSIWTXPOW	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCGIWTXPOW	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCSIWRETRY	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCGIWRETRY	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCSIWENCODE	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_ENCODING_TOKEN_MAX,
		.flags		= IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
	},
	[SIOCGIWENCODE	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_ENCODING_TOKEN_MAX,
		.flags		= IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
	},
	[SIOCSIWPOWER	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCGIWPOWER	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCSIWGENIE	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_GENERIC_IE_MAX,
	},
	[SIOCGIWGENIE	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_GENERIC_IE_MAX,
	},
	[SIOCSIWAUTH	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCGIWAUTH	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCSIWENCODEEXT - SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.min_tokens	= sizeof(struct iw_encode_ext),
		.max_tokens	= sizeof(struct iw_encode_ext) +
				  IW_ENCODING_TOKEN_MAX,
	},
	[SIOCGIWENCODEEXT - SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.min_tokens	= sizeof(struct iw_encode_ext),
		.max_tokens	= sizeof(struct iw_encode_ext) +
				  IW_ENCODING_TOKEN_MAX,
	},
	[SIOCSIWPMKSA - SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.min_tokens	= sizeof(struct iw_pmksa),
		.max_tokens	= sizeof(struct iw_pmksa),
	},
};
static const unsigned standard_ioctl_num = ARRAY_SIZE(standard_ioctl);

/*
 * Meta-data about all the additional standard Wireless Extension events
 * we know about.
 */
static const struct iw_ioctl_description standard_event[] = {
	[IWEVTXDROP	- IWEVFIRST] = {
		.header_type	= IW_HEADER_TYPE_ADDR,
	},
	[IWEVQUAL	- IWEVFIRST] = {
		.header_type	= IW_HEADER_TYPE_QUAL,
	},
	[IWEVCUSTOM	- IWEVFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_CUSTOM_MAX,
	},
	[IWEVREGISTERED	- IWEVFIRST] = {
		.header_type	= IW_HEADER_TYPE_ADDR,
	},
	[IWEVEXPIRED	- IWEVFIRST] = {
		.header_type	= IW_HEADER_TYPE_ADDR,
	},
	[IWEVGENIE	- IWEVFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_GENERIC_IE_MAX,
	},
	[IWEVMICHAELMICFAILURE	- IWEVFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= sizeof(struct iw_michaelmicfailure),
	},
	[IWEVASSOCREQIE	- IWEVFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_GENERIC_IE_MAX,
	},
	[IWEVASSOCRESPIE	- IWEVFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_GENERIC_IE_MAX,
	},
	[IWEVPMKIDCAND	- IWEVFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= sizeof(struct iw_pmkid_cand),
	},
};
static const unsigned standard_event_num = ARRAY_SIZE(standard_event);

/* Size (in bytes) of the various private data types */
static const char iw_priv_type_size[] = {
	0,				/* IW_PRIV_TYPE_NONE */
	1,				/* IW_PRIV_TYPE_BYTE */
	1,				/* IW_PRIV_TYPE_CHAR */
	0,				/* Not defined */
	sizeof(__u32),			/* IW_PRIV_TYPE_INT */
	sizeof(struct iw_freq),		/* IW_PRIV_TYPE_FLOAT */
	sizeof(struct sockaddr),	/* IW_PRIV_TYPE_ADDR */
	0,				/* Not defined */
};

/* Size (in bytes) of various events */
static const int event_type_size[] = {
	IW_EV_LCP_LEN,			/* IW_HEADER_TYPE_NULL */
	0,
	IW_EV_CHAR_LEN,			/* IW_HEADER_TYPE_CHAR */
	0,
	IW_EV_UINT_LEN,			/* IW_HEADER_TYPE_UINT */
	IW_EV_FREQ_LEN,			/* IW_HEADER_TYPE_FREQ */
	IW_EV_ADDR_LEN,			/* IW_HEADER_TYPE_ADDR */
	0,
	IW_EV_POINT_LEN,		/* Without variable payload */
	IW_EV_PARAM_LEN,		/* IW_HEADER_TYPE_PARAM */
	IW_EV_QUAL_LEN,			/* IW_HEADER_TYPE_QUAL */
};

/* Size (in bytes) of various events, as packed */
static const int event_type_pk_size[] = {
	IW_EV_LCP_PK_LEN,		/* IW_HEADER_TYPE_NULL */
	0,
	IW_EV_CHAR_PK_LEN,		/* IW_HEADER_TYPE_CHAR */
	0,
	IW_EV_UINT_PK_LEN,		/* IW_HEADER_TYPE_UINT */
	IW_EV_FREQ_PK_LEN,		/* IW_HEADER_TYPE_FREQ */
	IW_EV_ADDR_PK_LEN,		/* IW_HEADER_TYPE_ADDR */
	0,
	IW_EV_POINT_PK_LEN,		/* Without variable payload */
	IW_EV_PARAM_PK_LEN,		/* IW_HEADER_TYPE_PARAM */
	IW_EV_QUAL_PK_LEN,		/* IW_HEADER_TYPE_QUAL */
};

/************************ COMMON SUBROUTINES ************************/
/*
 * Stuff that may be used in various place or doesn't fit in one
 * of the section below.
 */

/* ---------------------------------------------------------------- */
/*
 * Return the driver handler associated with a specific Wireless Extension.
 */
static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
{
	/* Don't "optimise" the following variable, it will crash */
	unsigned int	index;		/* *MUST* be unsigned */

	/* Check if we have some wireless handlers defined */
	if (dev->wireless_handlers == NULL)
		return NULL;

	/* Try as a standard command */
	index = cmd - SIOCIWFIRST;
	if (index < dev->wireless_handlers->num_standard)
		return dev->wireless_handlers->standard[index];

	/* Try as a private command */
	index = cmd - SIOCIWFIRSTPRIV;
	if (index < dev->wireless_handlers->num_private)
		return dev->wireless_handlers->private[index];

	/* Not found */
	return NULL;
}

/* ---------------------------------------------------------------- */
/*
 * Get statistics out of the driver
 */
static struct iw_statistics *get_wireless_stats(struct net_device *dev)
{
	/* New location */
	if ((dev->wireless_handlers != NULL) &&
	   (dev->wireless_handlers->get_wireless_stats != NULL))
		return dev->wireless_handlers->get_wireless_stats(dev);

	/* Not found */
	return NULL;
}

/* ---------------------------------------------------------------- */
/*
 * Call the commit handler in the driver
 * (if exist and if conditions are right)
 *
 * Note : our current commit strategy is currently pretty dumb,
 * but we will be able to improve on that...
 * The goal is to try to agreagate as many changes as possible
 * before doing the commit. Drivers that will define a commit handler
 * are usually those that need a reset after changing parameters, so
 * we want to minimise the number of reset.
 * A cool idea is to use a timer : at each "set" command, we re-set the
 * timer, when the timer eventually fires, we call the driver.
 * Hopefully, more on that later.
 *
 * Also, I'm waiting to see how many people will complain about the
 * netif_running(dev) test. I'm open on that one...
 * Hopefully, the driver will remember to do a commit in "open()" ;-)
 */
static int call_commit_handler(struct net_device *dev)
{
	if ((netif_running(dev)) &&
	   (dev->wireless_handlers->standard[0] != NULL))
		/* Call the commit handler on the driver */
		return dev->wireless_handlers->standard[0](dev, NULL,
							   NULL, NULL);
	else
		return 0;		/* Command completed successfully */
}

/* ---------------------------------------------------------------- */
/*
 * Calculate size of private arguments
 */
static inline int get_priv_size(__u16	args)
{
	int	num = args & IW_PRIV_SIZE_MASK;
	int	type = (args & IW_PRIV_TYPE_MASK) >> 12;

	return num * iw_priv_type_size[type];
}

/* ---------------------------------------------------------------- */
/*
 * Re-calculate the size of private arguments
 */
static inline int adjust_priv_size(__u16		args,
				   union iwreq_data *	wrqu)
{
	int	num = wrqu->data.length;
	int	max = args & IW_PRIV_SIZE_MASK;
	int	type = (args & IW_PRIV_TYPE_MASK) >> 12;

	/* Make sure the driver doesn't goof up */
	if (max < num)
		num = max;

	return num * iw_priv_type_size[type];
}

/* ---------------------------------------------------------------- */
/*
 * Standard Wireless Handler : get wireless stats
 *	Allow programatic access to /proc/net/wireless even if /proc
 *	doesn't exist... Also more efficient...
 */
static int iw_handler_get_iwstats(struct net_device *		dev,
				  struct iw_request_info *	info,
				  union iwreq_data *		wrqu,
				  char *			extra)
{
	/* Get stats from the driver */
	struct iw_statistics *stats;

	stats = get_wireless_stats(dev);
	if (stats) {
		/* Copy statistics to extra */
		memcpy(extra, stats, sizeof(struct iw_statistics));
		wrqu->data.length = sizeof(struct iw_statistics);

		/* Check if we need to clear the updated flag */
		if (wrqu->data.flags != 0)
			stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
		return 0;
	} else
		return -EOPNOTSUPP;
}

/* ---------------------------------------------------------------- */
/*
 * Standard Wireless Handler : get iwpriv definitions
 * Export the driver private handler definition
 * They will be picked up by tools like iwpriv...
 */
static int iw_handler_get_private(struct net_device *		dev,
				  struct iw_request_info *	info,
				  union iwreq_data *		wrqu,
				  char *			extra)
{
	/* Check if the driver has something to export */
	if ((dev->wireless_handlers->num_private_args == 0) ||
	   (dev->wireless_handlers->private_args == NULL))
		return -EOPNOTSUPP;

	/* Check if there is enough buffer up there */
	if (wrqu->data.length < dev->wireless_handlers->num_private_args) {
		/* User space can't know in advance how large the buffer
		 * needs to be. Give it a hint, so that we can support
		 * any size buffer we want somewhat efficiently... */
		wrqu->data.length = dev->wireless_handlers->num_private_args;
		return -E2BIG;
	}

	/* Set the number of available ioctls. */
	wrqu->data.length = dev->wireless_handlers->num_private_args;

	/* Copy structure to the user buffer. */
	memcpy(extra, dev->wireless_handlers->private_args,
	       sizeof(struct iw_priv_args) * wrqu->data.length);

	return 0;
}


/******************** /proc/net/wireless SUPPORT ********************/
/*
 * The /proc/net/wireless file is a human readable user-space interface
 * exporting various wireless specific statistics from the wireless devices.
 * This is the most popular part of the Wireless Extensions ;-)
 *
 * This interface is a pure clone of /proc/net/dev (in net/core/dev.c).
 * The content of the file is basically the content of "struct iw_statistics".
 */

#ifdef CONFIG_PROC_FS

/* ---------------------------------------------------------------- */
/*
 * Print one entry (line) of /proc/net/wireless
 */
static void wireless_seq_printf_stats(struct seq_file *seq,
				      struct net_device *dev)
{
	/* Get stats from the driver */
	struct iw_statistics *stats = get_wireless_stats(dev);

	if (stats) {
		seq_printf(seq, "%6s: %04x  %3d%c  %3d%c  %3d%c  %6d %6d %6d "
				"%6d %6d   %6d\n",
			   dev->name, stats->status, stats->qual.qual,
			   stats->qual.updated & IW_QUAL_QUAL_UPDATED
			   ? '.' : ' ',
			   ((__s32) stats->qual.level) -
			   ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
			   stats->qual.updated & IW_QUAL_LEVEL_UPDATED
			   ? '.' : ' ',
			   ((__s32) stats->qual.noise) -
			   ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
			   stats->qual.updated & IW_QUAL_NOISE_UPDATED
			   ? '.' : ' ',
			   stats->discard.nwid, stats->discard.code,
			   stats->discard.fragment, stats->discard.retries,
			   stats->discard.misc, stats->miss.beacon);
		stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
	}
}

/* ---------------------------------------------------------------- */
/*
 * Print info for /proc/net/wireless (print all entries)
 */
static int wireless_seq_show(struct seq_file *seq, void *v)
{
	if (v == SEQ_START_TOKEN)
		seq_printf(seq, "Inter-| sta-|   Quality        |   Discarded "
				"packets               | Missed | WE\n"
				" face | tus | link level noise |  nwid  "
				"crypt   frag  retry   misc | beacon | %d\n",
			   WIRELESS_EXT);
	else
		wireless_seq_printf_stats(seq, v);
	return 0;
}

static const struct seq_operations wireless_seq_ops = {
	.start = dev_seq_start,
	.next  = dev_seq_next,
	.stop  = dev_seq_stop,
	.show  = wireless_seq_show,
};

static int wireless_seq_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &wireless_seq_ops);
}

static const struct file_operations wireless_seq_fops = {
	.owner	 = THIS_MODULE,
	.open    = wireless_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release,
};

int __init wext_proc_init(void)
{
	/* Create /proc/net/wireless entry */
	if (!proc_net_fops_create(&init_net, "wireless", S_IRUGO, &wireless_seq_fops))
		return -ENOMEM;

	return 0;
}
#endif	/* CONFIG_PROC_FS */

/************************** IOCTL SUPPORT **************************/
/*
 * The original user space API to configure all those Wireless Extensions
 * is through IOCTLs.
 * In there, we check if we need to call the new driver API (iw_handler)
 * or just call the driver ioctl handler.
 */

/* ---------------------------------------------------------------- */
/*
 * Wrapper to call a standard Wireless Extension handler.
 * We do various checks and also take care of moving data between
 * user space and kernel space.
 */
static int ioctl_standard_call(struct net_device *	dev,
			       struct ifreq *		ifr,
			       unsigned int		cmd,
			       iw_handler		handler)
{
	struct iwreq *				iwr = (struct iwreq *) ifr;
	const struct iw_ioctl_description *	descr;
	struct iw_request_info			info;
	int					ret = -EINVAL;

	/* Get the description of the IOCTL */
	if ((cmd - SIOCIWFIRST) >= standard_ioctl_num)
		return -EOPNOTSUPP;
	descr = &(standard_ioctl[cmd - SIOCIWFIRST]);

	/* Prepare the call */
	info.cmd = cmd;
	info.flags = 0;

	/* Check if we have a pointer to user space data or not */
	if (descr->header_type != IW_HEADER_TYPE_POINT) {

		/* No extra arguments. Trivial to handle */
		ret = handler(dev, &info, &(iwr->u), NULL);

		/* Generate an event to notify listeners of the change */
		if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
		   ((ret == 0) || (ret == -EIWCOMMIT)))
			wireless_send_event(dev, cmd, &(iwr->u), NULL);
	} else {
		char *	extra;
		int	extra_size;
		int	user_length = 0;
		int	err;
		int	essid_compat = 0;

		/* Calculate space needed by arguments. Always allocate
		 * for max space. Easier, and won't last long... */
		extra_size = descr->max_tokens * descr->token_size;

		/* Check need for ESSID compatibility for WE < 21 */
		switch (cmd) {
		case SIOCSIWESSID:
		case SIOCGIWESSID:
		case SIOCSIWNICKN:
		case SIOCGIWNICKN:
			if (iwr->u.data.length == descr->max_tokens + 1)
				essid_compat = 1;
			else if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
				char essid[IW_ESSID_MAX_SIZE + 1];

				err = copy_from_user(essid, iwr->u.data.pointer,
						     iwr->u.data.length *
						     descr->token_size);
				if (err)
					return -EFAULT;

				if (essid[iwr->u.data.length - 1] == '\0')
					essid_compat = 1;
			}
			break;
		default:
			break;
		}

		iwr->u.data.length -= essid_compat;

		/* Check what user space is giving us */
		if (IW_IS_SET(cmd)) {
			/* Check NULL pointer */
			if ((iwr->u.data.pointer == NULL) &&
			   (iwr->u.data.length != 0))
				return -EFAULT;
			/* Check if number of token fits within bounds */
			if (iwr->u.data.length > descr->max_tokens)
				return -E2BIG;
			if (iwr->u.data.length < descr->min_tokens)
				return -EINVAL;
		} else {
			/* Check NULL pointer */
			if (iwr->u.data.pointer == NULL)
				return -EFAULT;
			/* Save user space buffer size for checking */
			user_length = iwr->u.data.length;

			/* Don't check if user_length > max to allow forward
			 * compatibility. The test user_length < min is
			 * implied by the test at the end. */

			/* Support for very large requests */
			if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
			   (user_length > descr->max_tokens)) {
				/* Allow userspace to GET more than max so
				 * we can support any size GET requests.
				 * There is still a limit : -ENOMEM. */
				extra_size = user_length * descr->token_size;
				/* Note : user_length is originally a __u16,
				 * and token_size is controlled by us,
				 * so extra_size won't get negative and
				 * won't overflow... */
			}
		}

		/* Create the kernel buffer */
		/*    kzalloc ensures NULL-termination for essid_compat */
		extra = kzalloc(extra_size, GFP_KERNEL);
		if (extra == NULL)
			return -ENOMEM;

		/* If it is a SET, get all the extra data in here */
		if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
			err = copy_from_user(extra, iwr->u.data.pointer,
					     iwr->u.data.length *
					     descr->token_size);
			if (err) {
				kfree(extra);
				return -EFAULT;
			}
		}

		/* Call the handler */
		ret = handler(dev, &info, &(iwr->u), extra);

		iwr->u.data.length += essid_compat;

		/* If we have something to return to the user */
		if (!ret && IW_IS_GET(cmd)) {
			/* Check if there is enough buffer up there */
			if (user_length < iwr->u.data.length) {
				kfree(extra);
				return -E2BIG;
			}

			err = copy_to_user(iwr->u.data.pointer, extra,
					   iwr->u.data.length *
					   descr->token_size);
			if (err)
				ret =  -EFAULT;
		}

		/* Generate an event to notify listeners of the change */
		if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
		   ((ret == 0) || (ret == -EIWCOMMIT))) {
			if (descr->flags & IW_DESCR_FLAG_RESTRICT)
				/* If the event is restricted, don't
				 * export the payload */
				wireless_send_event(dev, cmd, &(iwr->u), NULL);
			else
				wireless_send_event(dev, cmd, &(iwr->u),
						    extra);
		}

		/* Cleanup - I told you it wasn't that long ;-) */
		kfree(extra);
	}

	/* Call commit handler if needed and defined */
	if (ret == -EIWCOMMIT)
		ret = call_commit_handler(dev);

	/* Here, we will generate the appropriate event if needed */

	return ret;
}

/* ---------------------------------------------------------------- */
/*
 * Wrapper to call a private Wireless Extension handler.
 * We do various checks and also take care of moving data between
 * user space and kernel space.
 * It's not as nice and slimline as the standard wrapper. The cause
 * is struct iw_priv_args, which was not really designed for the
 * job we are going here.
 *
 * IMPORTANT : This function prevent to set and get data on the same
 * IOCTL and enforce the SET/GET convention. Not doing it would be
 * far too hairy...
 * If you need to set and get data at the same time, please don't use
 * a iw_handler but process it in your ioctl handler (i.e. use the
 * old driver API).
 */
static int ioctl_private_call(struct net_device *dev, struct ifreq *ifr,
			      unsigned int cmd, iw_handler handler)
{
	struct iwreq *			iwr = (struct iwreq *) ifr;
	const struct iw_priv_args *	descr = NULL;
	struct iw_request_info		info;
	int				extra_size = 0;
	int				i;
	int				ret = -EINVAL;

	/* Get the description of the IOCTL */
	for (i = 0; i < dev->wireless_handlers->num_private_args; i++)
		if (cmd == dev->wireless_handlers->private_args[i].cmd) {
			descr = &(dev->wireless_handlers->private_args[i]);
			break;
		}

	/* Compute the size of the set/get arguments */
	if (descr != NULL) {
		if (IW_IS_SET(cmd)) {
			int	offset = 0;	/* For sub-ioctls */
			/* Check for sub-ioctl handler */
			if (descr->name[0] == '\0')
				/* Reserve one int for sub-ioctl index */
				offset = sizeof(__u32);

			/* Size of set arguments */
			extra_size = get_priv_size(descr->set_args);

			/* Does it fits in iwr ? */
			if ((descr->set_args & IW_PRIV_SIZE_FIXED) &&
			   ((extra_size + offset) <= IFNAMSIZ))
				extra_size = 0;
		} else {
			/* Size of get arguments */
			extra_size = get_priv_size(descr->get_args);

			/* Does it fits in iwr ? */
			if ((descr->get_args & IW_PRIV_SIZE_FIXED) &&
			   (extra_size <= IFNAMSIZ))
				extra_size = 0;
		}
	}

	/* Prepare the call */
	info.cmd = cmd;
	info.flags = 0;

	/* Check if we have a pointer to user space data or not. */
	if (extra_size == 0) {
		/* No extra arguments. Trivial to handle */
		ret = handler(dev, &info, &(iwr->u), (char *) &(iwr->u));
	} else {
		char *	extra;
		int	err;

		/* Check what user space is giving us */
		if (IW_IS_SET(cmd)) {
			/* Check NULL pointer */
			if ((iwr->u.data.pointer == NULL) &&
			   (iwr->u.data.length != 0))
				return -EFAULT;

			/* Does it fits within bounds ? */
			if (iwr->u.data.length > (descr->set_args &
						 IW_PRIV_SIZE_MASK))
				return -E2BIG;
		} else if (iwr->u.data.pointer == NULL)
			return -EFAULT;

		/* Always allocate for max space. Easier, and won't last
		 * long... */
		extra = kmalloc(extra_size, GFP_KERNEL);
		if (extra == NULL)
			return -ENOMEM;

		/* If it is a SET, get all the extra data in here */
		if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
			err = copy_from_user(extra, iwr->u.data.pointer,
					     extra_size);
			if (err) {
				kfree(extra);
				return -EFAULT;
			}
		}

		/* Call the handler */
		ret = handler(dev, &info, &(iwr->u), extra);

		/* If we have something to return to the user */
		if (!ret && IW_IS_GET(cmd)) {

			/* Adjust for the actual length if it's variable,
			 * avoid leaking kernel bits outside. */
			if (!(descr->get_args & IW_PRIV_SIZE_FIXED)) {
				extra_size = adjust_priv_size(descr->get_args,
							      &(iwr->u));
			}

			err = copy_to_user(iwr->u.data.pointer, extra,
					   extra_size);
			if (err)
				ret =  -EFAULT;
		}

		/* Cleanup - I told you it wasn't that long ;-) */
		kfree(extra);
	}


	/* Call commit handler if needed and defined */
	if (ret == -EIWCOMMIT)
		ret = call_commit_handler(dev);

	return ret;
}

/* ---------------------------------------------------------------- */
/*
 * Main IOCTl dispatcher.
 * Check the type of IOCTL and call the appropriate wrapper...
 */
static int wireless_process_ioctl(struct ifreq *ifr, unsigned int cmd)
{
	struct net_device *dev;
	iw_handler	handler;

	/* Permissions are already checked in dev_ioctl() before calling us.
	 * The copy_to/from_user() of ifr is also dealt with in there */

	/* Make sure the device exist */
	if ((dev = __dev_get_by_name(ifr->ifr_name)) == NULL)
		return -ENODEV;

	/* A bunch of special cases, then the generic case...
	 * Note that 'cmd' is already filtered in dev_ioctl() with
	 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
	if (cmd == SIOCGIWSTATS)
		return ioctl_standard_call(dev, ifr, cmd,
					   &iw_handler_get_iwstats);

	if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
		return ioctl_standard_call(dev, ifr, cmd,
					   &iw_handler_get_private);

	/* Basic check */
	if (!netif_device_present(dev))
		return -ENODEV;

	/* New driver API : try to find the handler */
	handler = get_handler(dev, cmd);
	if (handler) {
		/* Standard and private are not the same */
		if (cmd < SIOCIWFIRSTPRIV)
			return ioctl_standard_call(dev, ifr, cmd, handler);
		else
			return ioctl_private_call(dev, ifr, cmd, handler);
	}
	/* Old driver API : call driver ioctl handler */
	if (dev->do_ioctl)
		return dev->do_ioctl(dev, ifr, cmd);
	return -EOPNOTSUPP;
}

/* entry point from dev ioctl */
int wext_handle_ioctl(struct ifreq *ifr, unsigned int cmd,
		      void __user *arg)
{
	int ret;

	/* If command is `set a parameter', or
	 * `get the encoding parameters', check if
	 * the user has the right to do it */
	if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE || cmd == SIOCGIWENCODEEXT)
	    && !capable(CAP_NET_ADMIN))
		return -EPERM;

	dev_load(ifr->ifr_name);
	rtnl_lock();
	ret = wireless_process_ioctl(ifr, cmd);
	rtnl_unlock();
	if (IW_IS_GET(cmd) && copy_to_user(arg, ifr, sizeof(struct ifreq)))
		return -EFAULT;
	return ret;
}

/************************* EVENT PROCESSING *************************/
/*
 * Process events generated by the wireless layer or the driver.
 * Most often, the event will be propagated through rtnetlink
 */

/* ---------------------------------------------------------------- */
/*
 * Locking...
 * ----------
 *
 * Thanks to Herbert Xu <herbert@gondor.apana.org.au> for fixing
 * the locking issue in here and implementing this code !
 *
 * The issue : wireless_send_event() is often called in interrupt context,
 * while the Netlink layer can never be called in interrupt context.
 * The fully formed RtNetlink events are queued, and then a tasklet is run
 * to feed those to Netlink.
 * The skb_queue is interrupt safe, and its lock is not held while calling
 * Netlink, so there is no possibility of dealock.
 * Jean II
 */

static struct sk_buff_head wireless_nlevent_queue;

static int __init wireless_nlevent_init(void)
{
	skb_queue_head_init(&wireless_nlevent_queue);
	return 0;
}

subsys_initcall(wireless_nlevent_init);

static void wireless_nlevent_process(unsigned long data)
{
	struct sk_buff *skb;

	while ((skb = skb_dequeue(&wireless_nlevent_queue)))
		rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
}

static DECLARE_TASKLET(wireless_nlevent_tasklet, wireless_nlevent_process, 0);

/* ---------------------------------------------------------------- */
/*
 * Fill a rtnetlink message with our event data.
 * Note that we propage only the specified event and don't dump the
 * current wireless config. Dumping the wireless config is far too
 * expensive (for each parameter, the driver need to query the hardware).
 */
static int rtnetlink_fill_iwinfo(struct sk_buff *skb, struct net_device *dev,
				 int type, char *event, int event_len)
{
	struct ifinfomsg *r;
	struct nlmsghdr  *nlh;

	nlh = nlmsg_put(skb, 0, 0, type, sizeof(*r), 0);
	if (nlh == NULL)
		return -EMSGSIZE;

	r = nlmsg_data(nlh);
	r->ifi_family = AF_UNSPEC;
	r->__ifi_pad = 0;
	r->ifi_type = dev->type;
	r->ifi_index = dev->ifindex;
	r->ifi_flags = dev_get_flags(dev);
	r->ifi_change = 0;	/* Wireless changes don't affect those flags */

	/* Add the wireless events in the netlink packet */
	NLA_PUT(skb, IFLA_WIRELESS, event_len, event);

	return nlmsg_end(skb, nlh);

nla_put_failure:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
}

/* ---------------------------------------------------------------- */
/*
 * Create and broadcast and send it on the standard rtnetlink socket
 * This is a pure clone rtmsg_ifinfo() in net/core/rtnetlink.c
 * Andrzej Krzysztofowicz mandated that I used a IFLA_XXX field
 * within a RTM_NEWLINK event.
 */
static void rtmsg_iwinfo(struct net_device *dev, char *event, int event_len)
{
	struct sk_buff *skb;
	int err;

	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
	if (!skb)
		return;

	err = rtnetlink_fill_iwinfo(skb, dev, RTM_NEWLINK, event, event_len);
	if (err < 0) {
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
		return;
	}

	NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
	skb_queue_tail(&wireless_nlevent_queue, skb);
	tasklet_schedule(&wireless_nlevent_tasklet);
}

/* ---------------------------------------------------------------- */
/*
 * Main event dispatcher. Called from other parts and drivers.
 * Send the event on the appropriate channels.
 * May be called from interrupt context.
 */
void wireless_send_event(struct net_device *	dev,
			 unsigned int		cmd,
			 union iwreq_data *	wrqu,
			 char *			extra)
{
	const struct iw_ioctl_description *	descr = NULL;
	int extra_len = 0;
	struct iw_event  *event;		/* Mallocated whole event */
	int event_len;				/* Its size */
	int hdr_len;				/* Size of the event header */
	int wrqu_off = 0;			/* Offset in wrqu */
	/* Don't "optimise" the following variable, it will crash */
	unsigned	cmd_index;		/* *MUST* be unsigned */

	/* Get the description of the Event */
	if (cmd <= SIOCIWLAST) {
		cmd_index = cmd - SIOCIWFIRST;
		if (cmd_index < standard_ioctl_num)
			descr = &(standard_ioctl[cmd_index]);
	} else {
		cmd_index = cmd - IWEVFIRST;
		if (cmd_index < standard_event_num)
			descr = &(standard_event[cmd_index]);
	}
	/* Don't accept unknown events */
	if (descr == NULL) {
		/* Note : we don't return an error to the driver, because
		 * the driver would not know what to do about it. It can't
		 * return an error to the user, because the event is not
		 * initiated by a user request.
		 * The best the driver could do is to log an error message.
		 * We will do it ourselves instead...
		 */
		printk(KERN_ERR "%s (WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
		       dev->name, cmd);
		return;
	}

	/* Check extra parameters and set extra_len */
	if (descr->header_type == IW_HEADER_TYPE_POINT) {
		/* Check if number of token fits within bounds */
		if (wrqu->data.length > descr->max_tokens) {
			printk(KERN_ERR "%s (WE) : Wireless Event too big (%d)\n", dev->name, wrqu->data.length);
			return;
		}
		if (wrqu->data.length < descr->min_tokens) {
			printk(KERN_ERR "%s (WE) : Wireless Event too small (%d)\n", dev->name, wrqu->data.length);
			return;
		}
		/* Calculate extra_len - extra is NULL for restricted events */
		if (extra != NULL)
			extra_len = wrqu->data.length * descr->token_size;
		/* Always at an offset in wrqu */
		wrqu_off = IW_EV_POINT_OFF;
	}

	/* Total length of the event */
	hdr_len = event_type_size[descr->header_type];
	event_len = hdr_len + extra_len;

	/* Create temporary buffer to hold the event */
	event = kmalloc(event_len, GFP_ATOMIC);
	if (event == NULL)
		return;

	/* Fill event */
	event->len = event_len;
	event->cmd = cmd;
	memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
	if (extra)
		memcpy(((char *) event) + hdr_len, extra, extra_len);

	/* Send via the RtNetlink event channel */
	rtmsg_iwinfo(dev, (char *) event, event_len);

	/* Cleanup */
	kfree(event);

	return;		/* Always success, I guess ;-) */
}
EXPORT_SYMBOL(wireless_send_event);

/********************** ENHANCED IWSPY SUPPORT **********************/
/*
 * In the old days, the driver was handling spy support all by itself.
 * Now, the driver can delegate this task to Wireless Extensions.
 * It needs to use those standard spy iw_handler in struct iw_handler_def,
 * push data to us via wireless_spy_update() and include struct iw_spy_data
 * in its private part (and export it in net_device->wireless_data->spy_data).
 * One of the main advantage of centralising spy support here is that
 * it becomes much easier to improve and extend it without having to touch
 * the drivers. One example is the addition of the Spy-Threshold events.
 */

/* ---------------------------------------------------------------- */
/*
 * Return the pointer to the spy data in the driver.
 * Because this is called on the Rx path via wireless_spy_update(),
 * we want it to be efficient...
 */
static inline struct iw_spy_data *get_spydata(struct net_device *dev)
{
	/* This is the new way */
	if (dev->wireless_data)
		return dev->wireless_data->spy_data;
	return NULL;
}

/*------------------------------------------------------------------*/
/*
 * Standard Wireless Handler : set Spy List
 */
int iw_handler_set_spy(struct net_device *	dev,
		       struct iw_request_info *	info,
		       union iwreq_data *	wrqu,
		       char *			extra)
{
	struct iw_spy_data *	spydata = get_spydata(dev);
	struct sockaddr *	address = (struct sockaddr *) extra;

	/* Make sure driver is not buggy or using the old API */
	if (!spydata)
		return -EOPNOTSUPP;

	/* Disable spy collection while we copy the addresses.
	 * While we copy addresses, any call to wireless_spy_update()
	 * will NOP. This is OK, as anyway the addresses are changing. */
	spydata->spy_number = 0;

	/* We want to operate without locking, because wireless_spy_update()
	 * most likely will happen in the interrupt handler, and therefore
	 * have its own locking constraints and needs performance.
	 * The rtnl_lock() make sure we don't race with the other iw_handlers.
	 * This make sure wireless_spy_update() "see" that the spy list
	 * is temporarily disabled. */
	smp_wmb();

	/* Are there are addresses to copy? */
	if (wrqu->data.length > 0) {
		int i;

		/* Copy addresses */
		for (i = 0; i < wrqu->data.length; i++)
			memcpy(spydata->spy_address[i], address[i].sa_data,
			       ETH_ALEN);
		/* Reset stats */
		memset(spydata->spy_stat, 0,
		       sizeof(struct iw_quality) * IW_MAX_SPY);
	}

	/* Make sure above is updated before re-enabling */
	smp_wmb();

	/* Enable addresses */
	spydata->spy_number = wrqu->data.length;

	return 0;
}
EXPORT_SYMBOL(iw_handler_set_spy);

/*------------------------------------------------------------------*/
/*
 * Standard Wireless Handler : get Spy List
 */
int iw_handler_get_spy(struct net_device *	dev,
		       struct iw_request_info *	info,
		       union iwreq_data *	wrqu,
		       char *			extra)
{
	struct iw_spy_data *	spydata = get_spydata(dev);
	struct sockaddr *	address = (struct sockaddr *) extra;
	int			i;

	/* Make sure driver is not buggy or using the old API */
	if (!spydata)
		return -EOPNOTSUPP;

	wrqu->data.length = spydata->spy_number;

	/* Copy addresses. */
	for (i = 0; i < spydata->spy_number; i++) 	{
		memcpy(address[i].sa_data, spydata->spy_address[i], ETH_ALEN);
		address[i].sa_family = AF_UNIX;
	}
	/* Copy stats to the user buffer (just after). */
	if (spydata->spy_number > 0)
		memcpy(extra  + (sizeof(struct sockaddr) *spydata->spy_number),
		       spydata->spy_stat,
		       sizeof(struct iw_quality) * spydata->spy_number);
	/* Reset updated flags. */
	for (i = 0; i < spydata->spy_number; i++)
		spydata->spy_stat[i].updated &= ~IW_QUAL_ALL_UPDATED;
	return 0;
}
EXPORT_SYMBOL(iw_handler_get_spy);

/*------------------------------------------------------------------*/
/*
 * Standard Wireless Handler : set spy threshold
 */
int iw_handler_set_thrspy(struct net_device *	dev,
			  struct iw_request_info *info,
			  union iwreq_data *	wrqu,
			  char *		extra)
{
	struct iw_spy_data *	spydata = get_spydata(dev);
	struct iw_thrspy *	threshold = (struct iw_thrspy *) extra;

	/* Make sure driver is not buggy or using the old API */
	if (!spydata)
		return -EOPNOTSUPP;

	/* Just do it */
	memcpy(&(spydata->spy_thr_low), &(threshold->low),
	       2 * sizeof(struct iw_quality));

	/* Clear flag */
	memset(spydata->spy_thr_under, '\0', sizeof(spydata->spy_thr_under));

	return 0;
}
EXPORT_SYMBOL(iw_handler_set_thrspy);

/*------------------------------------------------------------------*/
/*
 * Standard Wireless Handler : get spy threshold
 */
int iw_handler_get_thrspy(struct net_device *	dev,
			  struct iw_request_info *info,
			  union iwreq_data *	wrqu,
			  char *		extra)
{
	struct iw_spy_data *	spydata = get_spydata(dev);
	struct iw_thrspy *	threshold = (struct iw_thrspy *) extra;

	/* Make sure driver is not buggy or using the old API */
	if (!spydata)
		return -EOPNOTSUPP;

	/* Just do it */
	memcpy(&(threshold->low), &(spydata->spy_thr_low),
	       2 * sizeof(struct iw_quality));

	return 0;
}
EXPORT_SYMBOL(iw_handler_get_thrspy);

/*------------------------------------------------------------------*/
/*
 * Prepare and send a Spy Threshold event
 */
static void iw_send_thrspy_event(struct net_device *	dev,
				 struct iw_spy_data *	spydata,
				 unsigned char *	address,
				 struct iw_quality *	wstats)
{
	union iwreq_data	wrqu;
	struct iw_thrspy	threshold;

	/* Init */
	wrqu.data.length = 1;
	wrqu.data.flags = 0;
	/* Copy address */
	memcpy(threshold.addr.sa_data, address, ETH_ALEN);
	threshold.addr.sa_family = ARPHRD_ETHER;
	/* Copy stats */
	memcpy(&(threshold.qual), wstats, sizeof(struct iw_quality));
	/* Copy also thresholds */
	memcpy(&(threshold.low), &(spydata->spy_thr_low),
	       2 * sizeof(struct iw_quality));

	/* Send event to user space */
	wireless_send_event(dev, SIOCGIWTHRSPY, &wrqu, (char *) &threshold);
}

/* ---------------------------------------------------------------- */
/*
 * Call for the driver to update the spy data.
 * For now, the spy data is a simple array. As the size of the array is
 * small, this is good enough. If we wanted to support larger number of
 * spy addresses, we should use something more efficient...
 */
void wireless_spy_update(struct net_device *	dev,
			 unsigned char *	address,
			 struct iw_quality *	wstats)
{
	struct iw_spy_data *	spydata = get_spydata(dev);
	int			i;
	int			match = -1;

	/* Make sure driver is not buggy or using the old API */
	if (!spydata)
		return;

	/* Update all records that match */
	for (i = 0; i < spydata->spy_number; i++)
		if (!compare_ether_addr(address, spydata->spy_address[i])) {
			memcpy(&(spydata->spy_stat[i]), wstats,
			       sizeof(struct iw_quality));
			match = i;
		}

	/* Generate an event if we cross the spy threshold.
	 * To avoid event storms, we have a simple hysteresis : we generate
	 * event only when we go under the low threshold or above the
	 * high threshold. */
	if (match >= 0) {
		if (spydata->spy_thr_under[match]) {
			if (wstats->level > spydata->spy_thr_high.level) {
				spydata->spy_thr_under[match] = 0;
				iw_send_thrspy_event(dev, spydata,
						     address, wstats);
			}
		} else {
			if (wstats->level < spydata->spy_thr_low.level) {
				spydata->spy_thr_under[match] = 1;
				iw_send_thrspy_event(dev, spydata,
						     address, wstats);
			}
		}
	}
}
EXPORT_SYMBOL(wireless_spy_update);