summaryrefslogtreecommitdiff
path: root/packages/linux/files/iw_handlers.w13-5.diff
blob: a27a7654a9648c23710b0bc2d627e881f4504744 (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
diff -u -p -r --new-file linux/include/linux-w12/netdevice.h linux/include/linux/netdevice.h
--- linux/include/linux-w12/netdevice.h	Thu Nov 22 11:47:09 2001
+++ linux/include/linux/netdevice.h	Thu Jan 17 12:00:39 2002
@@ -278,6 +278,10 @@ struct net_device
 	struct net_device_stats* (*get_stats)(struct net_device *dev);
 	struct iw_statistics*	(*get_wireless_stats)(struct net_device *dev);
 
+	/* List of functions to handle Wireless Extensions (instead of ioctl).
+	 * See <net/iw_handler.h> for details. Jean II */
+	struct iw_handler_def *	wireless_handlers;
+
 	/*
 	 * This marks the end of the "visible" part of the structure. All
 	 * fields hereafter are internal to the system, and may change at
diff -u -p -r --new-file linux/include/linux-w12/wireless.h linux/include/linux/wireless.h
--- linux/include/linux-w12/wireless.h	Thu Nov 22 11:47:12 2001
+++ linux/include/linux/wireless.h	Thu Jan 17 12:04:08 2002
@@ -1,9 +1,10 @@
 /*
  * This file define a set of standard wireless extensions
  *
- * Version :	12	5.10.01
+ * Version :	13	6.12.01
  *
  * Authors :	Jean Tourrilhes - HPL - <jt@hpl.hp.com>
+ * Copyright (c) 1997-2001 Jean Tourrilhes, All Rights Reserved.
  */
 
 #ifndef _LINUX_WIRELESS_H
@@ -11,6 +12,8 @@
 
 /************************** DOCUMENTATION **************************/
 /*
+ * Initial APIs (1996 -> onward) :
+ * -----------------------------
  * Basically, the wireless extensions are for now a set of standard ioctl
  * call + /proc/net/wireless
  *
@@ -27,16 +30,27 @@
  * We have the list of command plus a structure descibing the
  * data exchanged...
  * Note that to add these ioctl, I was obliged to modify :
- *	net/core/dev.c (two place + add include)
- *	net/ipv4/af_inet.c (one place + add include)
+ *	# net/core/dev.c (two place + add include)
+ *	# net/ipv4/af_inet.c (one place + add include)
  *
  * /proc/net/wireless is a copy of /proc/net/dev.
  * We have a structure for data passed from the driver to /proc/net/wireless
  * Too add this, I've modified :
- *	net/core/dev.c (two other places)
- *	include/linux/netdevice.h (one place)
- *	include/linux/proc_fs.h (one place)
+ *	# net/core/dev.c (two other places)
+ *	# include/linux/netdevice.h (one place)
+ *	# include/linux/proc_fs.h (one place)
+ *
+ * New driver API (2001 -> onward) :
+ * -------------------------------
+ * This file is only concerned with the user space API and common definitions.
+ * The new driver API is defined and documented in :
+ *	# include/net/iw_handler.h
  *
+ * Note as well that /proc/net/wireless implementation has now moved in :
+ *	# include/linux/wireless.c
+ *
+ * Other comments :
+ * --------------
  * Do not add here things that are redundant with other mechanisms
  * (drivers init, ifconfig, /proc/net/dev, ...) and with are not
  * wireless specific.
@@ -54,16 +68,14 @@
 #include <linux/socket.h>		/* for "struct sockaddr" et al	*/
 #include <linux/if.h>			/* for IFNAMSIZ and co... */
 
-/**************************** CONSTANTS ****************************/
-
-/* --------------------------- VERSION --------------------------- */
+/***************************** VERSION *****************************/
 /*
  * This constant is used to know the availability of the wireless
  * extensions and to know which version of wireless extensions it is
  * (there is some stuff that will be added in the future...)
  * I just plan to increment with each new version.
  */
-#define WIRELESS_EXT	12
+#define WIRELESS_EXT	13
 
 /*
  * Changes :
@@ -123,12 +135,20 @@
  *	- Add DEV PRIVATE IOCTL to avoid collisions in SIOCDEVPRIVATE space
  *	- Add new statistics (frag, retry, beacon)
  *	- Add average quality (for user space calibration)
+ *
+ * V12 to V13
+ * ----------
+ *	- Document creation of new driver API.
+ *	- Extract union iwreq_data from struct iwreq (for new driver API).
+ *	- Rename SIOCSIWNAME as SIOCSIWCOMMIT
  */
 
+/**************************** CONSTANTS ****************************/
+
 /* -------------------------- IOCTL LIST -------------------------- */
 
 /* Basic operations */
-#define SIOCSIWNAME	0x8B00		/* Unused */
+#define SIOCSIWCOMMIT	0x8B00		/* Commit pending changes to driver */
 #define SIOCGIWNAME	0x8B01		/* get name == wireless protocol */
 #define SIOCSIWNWID	0x8B02		/* set network id (the cell) */
 #define SIOCGIWNWID	0x8B03		/* get network id */
@@ -414,13 +434,49 @@ struct	iw_statistics
 
 /* ------------------------ IOCTL REQUEST ------------------------ */
 /*
+ * This structure defines the payload of an ioctl, and is used 
+ * below.
+ *
+ * Note that this structure should fit on the memory footprint
+ * of iwreq (which is the same as ifreq), which mean a max size of
+ * 16 octets = 128 bits. Warning, pointers might be 64 bits wide...
+ * You should check this when increasing the structures defined
+ * above in this file...
+ */
+union	iwreq_data
+{
+	/* Config - generic */
+	char		name[IFNAMSIZ];
+	/* Name : used to verify the presence of  wireless extensions.
+	 * Name of the protocol/provider... */
+
+	struct iw_point	essid;		/* Extended network name */
+	struct iw_param	nwid;		/* network id (or domain - the cell) */
+	struct iw_freq	freq;		/* frequency or channel :
+					 * 0-1000 = channel
+					 * > 1000 = frequency in Hz */
+
+	struct iw_param	sens;		/* signal level threshold */
+	struct iw_param	bitrate;	/* default bit rate */
+	struct iw_param	txpower;	/* default transmit power */
+	struct iw_param	rts;		/* RTS threshold threshold */
+	struct iw_param	frag;		/* Fragmentation threshold */
+	__u32		mode;		/* Operation mode */
+	struct iw_param	retry;		/* Retry limits & lifetime */
+
+	struct iw_point	encoding;	/* Encoding stuff : tokens */
+	struct iw_param	power;		/* PM duration/timeout */
+
+	struct sockaddr	ap_addr;	/* Access point address */
+
+	struct iw_point	data;		/* Other large parameters */
+};
+
+/*
  * The structure to exchange data for ioctl.
  * This structure is the same as 'struct ifreq', but (re)defined for
  * convenience...
- *
- * Note that it should fit on the same memory footprint !
- * You should check this when increasing the above structures (16 octets)
- * 16 octets = 128 bits. Warning, pointers might be 64 bits wide...
+ * Do I need to remind you about structure size (32 octets) ?
  */
 struct	iwreq 
 {
@@ -429,35 +485,8 @@ struct	iwreq 
 		char	ifrn_name[IFNAMSIZ];	/* if name, e.g. "eth0" */
 	} ifr_ifrn;
 
-	/* Data part */
-	union
-	{
-		/* Config - generic */
-		char		name[IFNAMSIZ];
-		/* Name : used to verify the presence of  wireless extensions.
-		 * Name of the protocol/provider... */
-
-		struct iw_point	essid;	/* Extended network name */
-		struct iw_param	nwid;	/* network id (or domain - the cell) */
-		struct iw_freq	freq;	/* frequency or channel :
-					 * 0-1000 = channel
-					 * > 1000 = frequency in Hz */
-
-		struct iw_param	sens;		/* signal level threshold */
-		struct iw_param	bitrate;	/* default bit rate */
-		struct iw_param	txpower;	/* default transmit power */
-		struct iw_param	rts;		/* RTS threshold threshold */
-		struct iw_param	frag;		/* Fragmentation threshold */
-		__u32		mode;		/* Operation mode */
-		struct iw_param	retry;		/* Retry limits & lifetime */
-
-		struct iw_point	encoding;	/* Encoding stuff : tokens */
-		struct iw_param	power;		/* PM duration/timeout */
-
-		struct sockaddr	ap_addr;	/* Access point address */
-
-		struct iw_point	data;		/* Other large parameters */
-	}	u;
+	/* Data part (defined just above) */
+	union	iwreq_data	u;
 };
 
 /* -------------------------- IOCTL DATA -------------------------- */
diff -u -p -r --new-file linux/include/net-w12/iw_handler.h linux/include/net/iw_handler.h
--- linux/include/net-w12/iw_handler.h	Wed Dec 31 16:00:00 1969
+++ linux/include/net/iw_handler.h	Thu Jan 17 12:16:46 2002
@@ -0,0 +1,374 @@
+/*
+ * This file define the new driver API for Wireless Extensions
+ *
+ * Version :	2	6.12.01
+ *
+ * Authors :	Jean Tourrilhes - HPL - <jt@hpl.hp.com>
+ * Copyright (c) 2001 Jean Tourrilhes, All Rights Reserved.
+ */
+
+#ifndef _IW_HANDLER_H
+#define _IW_HANDLER_H
+
+/************************** DOCUMENTATION **************************/
+/*
+ * Initial driver API (1996 -> onward) :
+ * -----------------------------------
+ * The initial API just sends the IOCTL request received from user space
+ * to the driver (via the driver ioctl handler). The driver has to
+ * handle all the rest...
+ *
+ * The initial API also defines a specific handler in struct net_device
+ * to handle wireless statistics.
+ *
+ * The initial APIs served us well and has proven a reasonably good design.
+ * However, there is a few shortcommings :
+ *	o No events, everything is a request to the driver.
+ *	o Large ioctl function in driver with gigantic switch statement
+ *	  (i.e. spaghetti code).
+ *	o Driver has to mess up with copy_to/from_user, and in many cases
+ *	  does it unproperly. Common mistakes are :
+ *		* buffer overflows (no checks or off by one checks)
+ *		* call copy_to/from_user with irq disabled
+ *	o The user space interface is tied to ioctl because of the use
+ *	  copy_to/from_user.
+ *
+ * New driver API (2001 -> onward) :
+ * -------------------------------
+ * The new driver API is just a bunch of standard functions (handlers),
+ * each handling a specific Wireless Extension. The driver just export
+ * the list of handler it supports, and those will be called apropriately.
+ *
+ * I tried to keep the main advantage of the previous API (simplicity,
+ * efficiency and light weight), and also I provide a good dose of backward
+ * compatibility (most structures are the same, driver can use both API
+ * simultaneously, ...).
+ * Hopefully, I've also addressed the shortcomming of the initial API.
+ *
+ * The advantage of the new API are :
+ *	o Handling of Extensions in driver broken in small contained functions
+ *	o Tighter checks of ioctl before calling the driver
+ *	o Flexible commit strategy (at least, the start of it)
+ *	o Backward compatibility (can be mixed with old API)
+ *	o Driver doesn't have to worry about memory and user-space issues
+ * The last point is important for the following reasons :
+ *	o You are now able to call the new driver API from any API you
+ *		want (including from within other parts of the kernel).
+ *	o Common mistakes are avoided (buffer overflow, user space copy
+ *		with irq disabled and so on).
+ *
+ * The Drawback of the new API are :
+ *	o bloat (especially kernel)
+ *	o need to migrate existing drivers to new API
+ * My initial testing shows that the new API adds around 3kB to the kernel
+ * and save between 0 and 5kB from a typical driver.
+ * Also, as all structures and data types are unchanged, the migration is
+ * quite straightforward (but tedious).
+ *
+ * ---
+ *
+ * The new driver API is defined below in this file. User space should
+ * not be aware of what's happening down there...
+ *
+ * A new kernel wrapper is in charge of validating the IOCTLs and calling
+ * the appropriate driver handler. This is implemented in :
+ *	# net/core/wireless.c
+ *
+ * The driver export the list of handlers in :
+ *	# include/linux/netdevice.h (one place)
+ *
+ * The new driver API is available for WIRELESS_EXT >= 13.
+ * Good luck with migration to the new API ;-)
+ */
+
+/* ---------------------- THE IMPLEMENTATION ---------------------- */
+/*
+ * Some of the choice I've made are pretty controversials. Defining an
+ * API is very much weighting compromises. This goes into some of the
+ * details and the thinking behind the implementation.
+ *
+ * Implementation goals :
+ * --------------------
+ * The implementation goals were as follow :
+ *	o Obvious : you should not need a PhD to understand what's happening,
+ *		the benefit is easier maintainance.
+ *	o Flexible : it should accomodate a wide variety of driver
+ *		implementations and be as flexible as the old API.
+ *	o Lean : it should be efficient memory wise to minimise the impact
+ *		on kernel footprint.
+ *	o Transparent to user space : the large number of user space
+ *		applications that use Wireless Extensions should not need
+ *		any modifications.
+ *
+ * Array of functions versus Struct of functions
+ * ---------------------------------------------
+ * 1) Having an array of functions allow the kernel code to access the
+ * handler in a single lookup, which is much more efficient (think hash
+ * table here).
+ * 2) The only drawback is that driver writer may put their handler in
+ * the wrong slot. This is trivial to test (I set the frequency, the
+ * bitrate changes). Once the handler is in the proper slot, it will be
+ * there forever, because the array is only extended at the end.
+ * 3) Backward/forward compatibility : adding new handler just require
+ * extending the array, so you can put newer driver in older kernel
+ * without having to patch the kernel code (and vice versa).
+ *
+ * All handler are of the same generic type
+ * ----------------------------------------
+ * That's a feature !!!
+ * 1) Having a generic handler allow to have generic code, which is more
+ * efficient. If each of the handler was individually typed I would need
+ * to add a big switch in the kernel (== more bloat). This solution is
+ * more scalable, adding new Wireless Extensions doesn't add new code.
+ * 2) You can use the same handler in different slots of the array. For
+ * hardware, it may be more efficient or logical to handle multiple
+ * Wireless Extensions with a single function, and the API allow you to
+ * do that. (An example would be a single record on the card to control
+ * both bitrate and frequency, the handler would read the old record,
+ * modify it according to info->cmd and rewrite it).
+ *
+ * Functions prototype uses union iwreq_data
+ * -----------------------------------------
+ * Some would have prefered functions defined this way :
+ *	static int mydriver_ioctl_setrate(struct net_device *dev, 
+ *					  long rate, int auto)
+ * 1) The kernel code doesn't "validate" the content of iwreq_data, and
+ * can't do it (different hardware may have different notion of what a
+ * valid frequency is), so we don't pretend that we do it.
+ * 2) The above form is not extendable. If I want to add a flag (for
+ * example to distinguish setting max rate and basic rate), I would
+ * break the prototype. Using iwreq_data is more flexible.
+ * 3) Also, the above form is not generic (see above).
+ * 4) I don't expect driver developper using the wrong field of the
+ * union (Doh !), so static typechecking doesn't add much value.
+ * 5) Lastly, you can skip the union by doing :
+ *	static int mydriver_ioctl_setrate(struct net_device *dev,
+ *					  struct iw_request_info *info,
+ *					  struct iw_param *rrq,
+ *					  char *extra)
+ * And then adding the handler in the array like this :
+ *        (iw_handler) mydriver_ioctl_setrate,             // SIOCSIWRATE
+ *
+ * Using functions and not a registry
+ * ----------------------------------
+ * Another implementation option would have been for every instance to
+ * define a registry (a struct containing all the Wireless Extensions)
+ * and only have a function to commit the registry to the hardware.
+ * 1) This approach can be emulated by the current code, but not
+ * vice versa.
+ * 2) Some drivers don't keep any configuration in the driver, for them
+ * adding such a registry would be a significant bloat.
+ * 3) The code to translate from Wireless Extension to native format is
+ * needed anyway, so it would not reduce significantely the amount of code.
+ * 4) The current approach only selectively translate Wireless Extensions
+ * to native format and only selectively set, whereas the registry approach
+ * would require to translate all WE and set all parameters for any single
+ * change.
+ * 5) For many Wireless Extensions, the GET operation return the current
+ * dynamic value, not the value that was set.
+ *
+ * This header is <net/iw_handler.h>
+ * ---------------------------------
+ * 1) This header is kernel space only and should not be exported to
+ * user space. Headers in "include/linux/" are exported, headers in
+ * "include/net/" are not.
+ *
+ * Mixed 32/64 bit issues
+ * ----------------------
+ * The Wireless Extensions are designed to be 64 bit clean, by using only
+ * datatypes with explicit storage size.
+ * There are some issues related to kernel and user space using different
+ * memory model, and in particular 64bit kernel with 32bit user space.
+ * The problem is related to struct iw_point, that contains a pointer
+ * that *may* need to be translated.
+ * This is quite messy. The new API doesn't solve this problem (it can't),
+ * but is a step in the right direction :
+ * 1) Meta data about each ioctl is easily available, so we know what type
+ * of translation is needed.
+ * 2) The move of data between kernel and user space is only done in a single
+ * place in the kernel, so adding specific hooks in there is possible.
+ * 3) In the long term, it allows to move away from using ioctl as the
+ * user space API.
+ *
+ * So many comments and so few code
+ * --------------------------------
+ * That's a feature. Comments won't bloat the resulting kernel binary.
+ */
+
+/***************************** INCLUDES *****************************/
+
+#include <linux/wireless.h>		/* IOCTL user space API */
+
+/***************************** VERSION *****************************/
+/*
+ * This constant is used to know which version of the driver API is
+ * available. Hopefully, this will be pretty stable and no changes
+ * will be needed...
+ * I just plan to increment with each new version.
+ */
+#define IW_HANDLER_VERSION	2
+
+/**************************** CONSTANTS ****************************/
+
+/* Special error message for the driver to indicate that we
+ * should do a commit after return from the iw_handler */
+#define EIWCOMMIT	EINPROGRESS
+
+/* Flags available in struct iw_request_info */
+#define IW_REQUEST_FLAG_NONE	0x0000	/* No flag so far */
+
+/* Type of headers we know about (basically union iwreq_data) */
+#define IW_HEADER_TYPE_NULL	0	/* Not available */
+#define IW_HEADER_TYPE_CHAR	2	/* char [IFNAMSIZ] */
+#define IW_HEADER_TYPE_UINT	4	/* __u32 */
+#define IW_HEADER_TYPE_FREQ	5	/* struct iw_freq */
+#define IW_HEADER_TYPE_POINT	6	/* struct iw_point */
+#define IW_HEADER_TYPE_PARAM	7	/* struct iw_param */
+#define IW_HEADER_TYPE_ADDR	8	/* struct sockaddr */
+
+/* Handling flags */
+/* Most are not implemented. I just use them as a reminder of some
+ * cool features we might need one day ;-) */
+#define IW_DESCR_FLAG_NONE	0x0000	/* Obvious */
+/* Wrapper level flags */
+#define IW_DESCR_FLAG_DUMP	0x0001	/* Not part of the dump command */
+#define IW_DESCR_FLAG_EVENT	0x0002	/* Generate an event on SET */
+#define IW_DESCR_FLAG_RESTRICT	0x0004	/* GET request is ROOT only */
+/* Driver level flags */
+#define IW_DESCR_FLAG_WAIT	0x0100	/* Wait for driver event */
+
+/****************************** TYPES ******************************/
+
+/* ----------------------- WIRELESS HANDLER ----------------------- */
+/*
+ * A wireless handler is just a standard function, that looks like the
+ * ioctl handler.
+ * We also define there how a handler list look like... As the Wireless
+ * Extension space is quite dense, we use a simple array, which is faster
+ * (that's the perfect hash table ;-).
+ */
+
+/*
+ * Meta data about the request passed to the iw_handler.
+ * Most handlers can safely ignore what's in there.
+ * The 'cmd' field might come handy if you want to use the same handler
+ * for multiple command...
+ * This struct is also my long term insurance. I can add new fields here
+ * without breaking the prototype of iw_handler...
+ */
+struct iw_request_info
+{
+	__u16		cmd;		/* Wireless Extension command */
+	__u16		flags;		/* More to come ;-) */
+};
+
+/*
+ * This is how a function handling a Wireless Extension should look
+ * like (both get and set, standard and private).
+ */
+typedef int (*iw_handler)(struct net_device *dev, struct iw_request_info *info,
+			  union iwreq_data *wrqu, char *extra);
+
+/*
+ * This define all the handler that the driver export.
+ * As you need only one per driver type, please use a static const
+ * shared by all driver instances... Same for the members...
+ * This will be linked from net_device in <linux/netdevice.h>
+ */
+struct iw_handler_def
+{
+	/* Number of handlers defined (more precisely, index of the
+	 * last defined handler + 1) */
+	__u16			num_standard;
+	__u16			num_private;
+	/* Number of private arg description */
+	__u16			num_private_args;
+
+	/* Array of handlers for standard ioctls
+	 * We will call dev->wireless_handlers->standard[ioctl - SIOCSIWNAME]
+	 */
+	iw_handler *		standard;
+
+	/* Array of handlers for private ioctls
+	 * Will call dev->wireless_handlers->private[ioctl - SIOCIWFIRSTPRIV]
+	 */
+	iw_handler *		private;
+
+	/* Arguments of private handler. This one is just a list, so you
+	 * can put it in any order you want and should not leave holes...
+	 * We will automatically export that to user space... */
+	struct iw_priv_args *	private_args;
+
+	/* In the long term, get_wireless_stats will move from
+	 * 'struct net_device' to here, to minimise bloat. */
+};
+
+/* ----------------------- WIRELESS EVENTS ----------------------- */
+/*
+ * Currently we don't support events, so let's just plan for the
+ * future...
+ */
+
+/*
+ * A Wireless Event.
+ */
+// How do we define short header ? We don't want a flag on length.
+// Probably a flag on event ? Highest bit to zero...
+struct iw_event
+{
+	__u16		length;			/* Lenght of this stuff */
+	__u16		event;			/* Wireless IOCTL */
+	union	iwreq_data	header;		/* IOCTL fixed payload */
+	char		extra[0];		/* Optional IOCTL data */
+};
+
+/* ---------------------- IOCTL DESCRIPTION ---------------------- */
+/*
+ * One of the main goal of the new interface is to deal entirely with
+ * user space/kernel space memory move.
+ * For that, we need to know :
+ *	o if iwreq is a pointer or contain the full data
+ *	o what is the size of the data to copy
+ *
+ * For private IOCTLs, we use the same rules as used by iwpriv and
+ * defined in struct iw_priv_args.
+ *
+ * For standard IOCTLs, things are quite different and we need to
+ * use the stuctures below. Actually, this struct is also more
+ * efficient, but that's another story...
+ */
+
+/*
+ * Describe how a standard IOCTL looks like.
+ */
+struct iw_ioctl_description
+{
+	__u8	header_type;		/* NULL, iw_point or other */
+	__u8	token_type;		/* Future */
+	__u16	token_size;		/* Granularity of payload */
+	__u16	min_tokens;		/* Min acceptable token number */
+	__u16	max_tokens;		/* Max acceptable token number */
+	__u32	flags;			/* Special handling of the request */
+};
+
+/* Need to think of short header translation table. Later. */
+
+/**************************** PROTOTYPES ****************************/
+/*
+ * Functions part of the Wireless Extensions (defined in net/core/wireless.c).
+ * Those may be called only within the kernel.
+ */
+
+/* First : function strictly used inside the kernel */
+
+/* Handle /proc/net/wireless, called in net/code/dev.c */
+extern int dev_get_wireless_info(char * buffer, char **start, off_t offset,
+				 int length);
+
+/* Handle IOCTLs, called in net/code/dev.c */
+extern int wireless_process_ioctl(struct ifreq *ifr, unsigned int cmd);
+
+/* Second : functions that may be called by driver modules */
+/* None yet */
+
+#endif	/* _LINUX_WIRELESS_H */
diff -u -p -r --new-file linux/net/core-w12/Makefile linux/net/core/Makefile
--- linux/net/core-w12/Makefile	Tue Oct 30 15:08:12 2001
+++ linux/net/core/Makefile	Thu Jan 17 11:06:07 2002
@@ -26,5 +26,8 @@ obj-$(CONFIG_NET) += dev.o dev_mcast.o d
 obj-$(CONFIG_NETFILTER) += netfilter.o
 obj-$(CONFIG_NET_DIVERT) += dv.o
 obj-$(CONFIG_NET_PROFILE) += profile.o
+obj-$(CONFIG_NET_RADIO) += wireless.o
+# Ugly. I wish all wireless drivers were moved in drivers/net/wireless
+obj-$(CONFIG_NET_PCMCIA_RADIO) += wireless.o
 
 include $(TOPDIR)/Rules.make
diff -u -p -r --new-file linux/net/core-w12/dev.c linux/net/core/dev.c
--- linux/net/core-w12/dev.c	Wed Nov  7 14:39:36 2001
+++ linux/net/core/dev.c	Thu Jan 17 11:06:07 2002
@@ -102,6 +102,7 @@
 #include <linux/module.h>
 #if defined(CONFIG_NET_RADIO) || defined(CONFIG_NET_PCMCIA_RADIO)
 #include <linux/wireless.h>		/* Note : will define WIRELESS_EXT */
+#include <net/iw_handler.h>
 #endif	/* CONFIG_NET_RADIO || CONFIG_NET_PCMCIA_RADIO */
 #ifdef CONFIG_PLIP
 extern int plip_init(void);
@@ -1796,122 +1797,6 @@ static int dev_proc_stats(char *buffer, 
 #endif	/* CONFIG_PROC_FS */
 
 
-#ifdef WIRELESS_EXT
-#ifdef CONFIG_PROC_FS
-
-/*
- * Print one entry of /proc/net/wireless
- * This is a clone of /proc/net/dev (just above)
- */
-static int sprintf_wireless_stats(char *buffer, struct net_device *dev)
-{
-	/* Get stats from the driver */
-	struct iw_statistics *stats = (dev->get_wireless_stats ?
-				       dev->get_wireless_stats(dev) :
-				       (struct iw_statistics *) NULL);
-	int size;
-
-	if (stats != (struct iw_statistics *) NULL) {
-		size = sprintf(buffer,
-			       "%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 & 1 ? '.' : ' ',
-			       stats->qual.level,
-			       stats->qual.updated & 2 ? '.' : ' ',
-			       stats->qual.noise,
-			       stats->qual.updated & 4 ? '.' : ' ',
-			       stats->discard.nwid,
-			       stats->discard.code,
-			       stats->discard.fragment,
-			       stats->discard.retries,
-			       stats->discard.misc,
-			       stats->miss.beacon);
-		stats->qual.updated = 0;
-	}
-	else
-		size = 0;
-
-	return size;
-}
-
-/*
- * Print info for /proc/net/wireless (print all entries)
- * This is a clone of /proc/net/dev (just above)
- */
-static int dev_get_wireless_info(char * buffer, char **start, off_t offset,
-			  int length)
-{
-	int		len = 0;
-	off_t		begin = 0;
-	off_t		pos = 0;
-	int		size;
-	
-	struct net_device *	dev;
-
-	size = sprintf(buffer,
-		       "Inter-| sta-|   Quality        |   Discarded packets               | Missed\n"
-		       " face | tus | link level noise |  nwid  crypt   frag  retry   misc | beacon\n"
-			);
-	
-	pos += size;
-	len += size;
-
-	read_lock(&dev_base_lock);
-	for (dev = dev_base; dev != NULL; dev = dev->next) {
-		size = sprintf_wireless_stats(buffer + len, dev);
-		len += size;
-		pos = begin + len;
-
-		if (pos < offset) {
-			len = 0;
-			begin = pos;
-		}
-		if (pos > offset + length)
-			break;
-	}
-	read_unlock(&dev_base_lock);
-
-	*start = buffer + (offset - begin);	/* Start of wanted data */
-	len -= (offset - begin);		/* Start slop */
-	if (len > length)
-		len = length;			/* Ending slop */
-	if (len < 0)
-		len = 0;
-
-	return len;
-}
-#endif	/* CONFIG_PROC_FS */
-
-/*
- *	Allow programatic access to /proc/net/wireless even if /proc
- *	doesn't exist... Also more efficient...
- */
-static inline int dev_iwstats(struct net_device *dev, struct ifreq *ifr)
-{
-	/* Get stats from the driver */
-	struct iw_statistics *stats = (dev->get_wireless_stats ?
-				       dev->get_wireless_stats(dev) :
-				       (struct iw_statistics *) NULL);
-
-	if (stats != (struct iw_statistics *) NULL) {
-		struct iwreq *	wrq = (struct iwreq *)ifr;
-
-		/* Copy statistics to the user buffer */
-		if(copy_to_user(wrq->u.data.pointer, stats,
-				sizeof(struct iw_statistics)))
-			return -EFAULT;
-
-		/* Check if we need to clear the update flag */
-		if(wrq->u.data.flags != 0)
-			stats->qual.updated = 0;
-		return(0);
-	} else
-		return -EOPNOTSUPP;
-}
-#endif	/* WIRELESS_EXT */
-
 /**
  *	netdev_set_master	-	set up master/slave pair
  *	@slave: slave device
@@ -2209,11 +2094,6 @@ static int dev_ifsioc(struct ifreq *ifr,
 			notifier_call_chain(&netdev_chain, NETDEV_CHANGENAME, dev);
 			return 0;
 
-#ifdef WIRELESS_EXT
-		case SIOCGIWSTATS:
-			return dev_iwstats(dev, ifr);
-#endif	/* WIRELESS_EXT */
-
 		/*
 		 *	Unknown or private ioctl
 		 */
@@ -2239,17 +2119,6 @@ static int dev_ifsioc(struct ifreq *ifr,
 				return -EOPNOTSUPP;
 			}
 
-#ifdef WIRELESS_EXT
-			if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
-				if (dev->do_ioctl) {
-					if (!netif_device_present(dev))
-						return -ENODEV;
-					return dev->do_ioctl(dev, ifr, cmd);
-				}
-				return -EOPNOTSUPP;
-			}
-#endif	/* WIRELESS_EXT */
-
 	}
 	return -EINVAL;
 }
@@ -2431,7 +2300,8 @@ int dev_ioctl(unsigned int cmd, void *ar
 				}
 				dev_load(ifr.ifr_name);
 				rtnl_lock();
-				ret = dev_ifsioc(&ifr, cmd);
+				/* Follow me in net/core/wireless.c */
+				ret = wireless_process_ioctl(&ifr, cmd);
 				rtnl_unlock();
 				if (!ret && IW_IS_GET(cmd) &&
 				    copy_to_user(arg, &ifr, sizeof(struct ifreq)))
@@ -2856,6 +2726,7 @@ int __init net_dev_init(void)
 	proc_net_create("dev", 0, dev_get_info);
 	create_proc_read_entry("net/softnet_stat", 0, 0, dev_proc_stats, NULL);
 #ifdef WIRELESS_EXT
+	/* Available in net/core/wireless.c */
 	proc_net_create("wireless", 0, dev_get_wireless_info);
 #endif	/* WIRELESS_EXT */
 #endif	/* CONFIG_PROC_FS */
diff -u -p -r --new-file linux/net/core-w12/wireless.c linux/net/core/wireless.c
--- linux/net/core-w12/wireless.c	Wed Dec 31 16:00:00 1969
+++ linux/net/core/wireless.c	Mon Jan 21 11:13:23 2002
@@ -0,0 +1,733 @@
+/*
+ * This file implement the Wireless Extensions APIs.
+ *
+ * Authors :	Jean Tourrilhes - HPL - <jt@hpl.hp.com>
+ * Copyright (c) 1997-2001 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
+ */
+
+/***************************** INCLUDES *****************************/
+
+#include <asm/uaccess.h>		/* copy_to_user() */
+#include <linux/config.h>		/* Not needed ??? */
+#include <linux/types.h>		/* off_t */
+#include <linux/netdevice.h>		/* struct ifreq, dev_get_by_name() */
+
+#include <linux/wireless.h>		/* Pretty obvious */
+#include <net/iw_handler.h>		/* New driver API */
+
+/**************************** CONSTANTS ****************************/
+
+/* This will be turned on later on... */
+#undef WE_STRICT_WRITE		/* Check write buffer size */
+
+/* Debuging stuff */
+#undef WE_IOCTL_DEBUG		/* Debug IOCTL API */
+
+/************************* GLOBAL VARIABLES *************************/
+/*
+ * You should not use global variables, because or re-entrancy.
+ * On our case, it's only const, so it's OK...
+ */
+static const struct iw_ioctl_description	standard_ioctl[] = {
+	/* SIOCSIWCOMMIT (internal) */
+	{ IW_HEADER_TYPE_NULL, 0, 0, 0, 0, 0},
+	/* SIOCGIWNAME */
+	{ IW_HEADER_TYPE_CHAR, 0, 0, 0, 0, IW_DESCR_FLAG_DUMP},
+	/* SIOCSIWNWID */
+	{ IW_HEADER_TYPE_PARAM, 0, 0, 0, 0, IW_DESCR_FLAG_EVENT},
+	/* SIOCGIWNWID */
+	{ IW_HEADER_TYPE_PARAM, 0, 0, 0, 0, IW_DESCR_FLAG_DUMP},
+	/* SIOCSIWFREQ */
+	{ IW_HEADER_TYPE_FREQ, 0, 0, 0, 0, IW_DESCR_FLAG_EVENT},
+	/* SIOCGIWFREQ */
+	{ IW_HEADER_TYPE_FREQ, 0, 0, 0, 0, IW_DESCR_FLAG_DUMP},
+	/* SIOCSIWMODE */
+	{ IW_HEADER_TYPE_UINT, 0, 0, 0, 0, IW_DESCR_FLAG_EVENT},
+	/* SIOCGIWMODE */
+	{ IW_HEADER_TYPE_UINT, 0, 0, 0, 0, IW_DESCR_FLAG_DUMP},
+	/* SIOCSIWSENS */
+	{ IW_HEADER_TYPE_PARAM, 0, 0, 0, 0, 0},
+	/* SIOCGIWSENS */
+	{ IW_HEADER_TYPE_PARAM, 0, 0, 0, 0, 0},
+	/* SIOCSIWRANGE */
+	{ IW_HEADER_TYPE_NULL, 0, 0, 0, 0, 0},
+	/* SIOCGIWRANGE */
+	{ IW_HEADER_TYPE_POINT, 0, 1, 0, sizeof(struct iw_range), IW_DESCR_FLAG_DUMP},
+	/* SIOCSIWPRIV */
+	{ IW_HEADER_TYPE_NULL, 0, 0, 0, 0, 0},
+	/* SIOCGIWPRIV (handled directly by us) */
+	{ IW_HEADER_TYPE_NULL, 0, 0, 0, 0, 0},
+	/* SIOCSIWSTATS */
+	{ IW_HEADER_TYPE_NULL, 0, 0, 0, 0, 0},
+	/* SIOCGIWSTATS (handled directly by us) */
+	{ IW_HEADER_TYPE_NULL, 0, 0, 0, 0, IW_DESCR_FLAG_DUMP},
+	/* SIOCSIWSPY */
+	{ IW_HEADER_TYPE_POINT, 0, sizeof(struct sockaddr), 0, IW_MAX_SPY, 0},
+	/* SIOCGIWSPY */
+	{ IW_HEADER_TYPE_POINT, 0, (sizeof(struct sockaddr) + sizeof(struct iw_quality)), 0, IW_MAX_SPY, 0},
+	/* -- hole -- */
+	{ IW_HEADER_TYPE_NULL, 0, 0, 0, 0, 0},
+	/* -- hole -- */
+	{ IW_HEADER_TYPE_NULL, 0, 0, 0, 0, 0},
+	/* SIOCSIWAP */
+	{ IW_HEADER_TYPE_ADDR, 0, 0, 0, 0, 0},
+	/* SIOCGIWAP */
+	{ IW_HEADER_TYPE_ADDR, 0, 0, 0, 0, IW_DESCR_FLAG_DUMP},
+	/* -- hole -- */
+	{ IW_HEADER_TYPE_NULL, 0, 0, 0, 0, 0},
+	/* SIOCGIWAPLIST */
+	{ IW_HEADER_TYPE_POINT, 0, (sizeof(struct sockaddr) + sizeof(struct iw_quality)), 0, IW_MAX_AP, 0},
+	/* -- hole -- */
+	{ IW_HEADER_TYPE_NULL, 0, 0, 0, 0, 0},
+	/* -- hole -- */
+	{ IW_HEADER_TYPE_NULL, 0, 0, 0, 0, 0},
+	/* SIOCSIWESSID */
+	{ IW_HEADER_TYPE_POINT, 0, 1, 0, IW_ESSID_MAX_SIZE, IW_DESCR_FLAG_EVENT},
+	/* SIOCGIWESSID */
+	{ IW_HEADER_TYPE_POINT, 0, 1, 0, IW_ESSID_MAX_SIZE, IW_DESCR_FLAG_DUMP},
+	/* SIOCSIWNICKN */
+	{ IW_HEADER_TYPE_POINT, 0, 1, 0, IW_ESSID_MAX_SIZE, 0},
+	/* SIOCGIWNICKN */
+	{ IW_HEADER_TYPE_POINT, 0, 1, 0, IW_ESSID_MAX_SIZE, 0},
+	/* -- hole -- */
+	{ IW_HEADER_TYPE_NULL, 0, 0, 0, 0, 0},
+	/* -- hole -- */
+	{ IW_HEADER_TYPE_NULL, 0, 0, 0, 0, 0},
+	/* SIOCSIWRATE */
+	{ IW_HEADER_TYPE_PARAM, 0, 0, 0, 0, 0},
+	/* SIOCGIWRATE */
+	{ IW_HEADER_TYPE_PARAM, 0, 0, 0, 0, 0},
+	/* SIOCSIWRTS */
+	{ IW_HEADER_TYPE_PARAM, 0, 0, 0, 0, 0},
+	/* SIOCGIWRTS */
+	{ IW_HEADER_TYPE_PARAM, 0, 0, 0, 0, 0},
+	/* SIOCSIWFRAG */
+	{ IW_HEADER_TYPE_PARAM, 0, 0, 0, 0, 0},
+	/* SIOCGIWFRAG */
+	{ IW_HEADER_TYPE_PARAM, 0, 0, 0, 0, 0},
+	/* SIOCSIWTXPOW */
+	{ IW_HEADER_TYPE_PARAM, 0, 0, 0, 0, 0},
+	/* SIOCGIWTXPOW */
+	{ IW_HEADER_TYPE_PARAM, 0, 0, 0, 0, 0},
+	/* SIOCSIWRETRY */
+	{ IW_HEADER_TYPE_PARAM, 0, 0, 0, 0, 0},
+	/* SIOCGIWRETRY */
+	{ IW_HEADER_TYPE_PARAM, 0, 0, 0, 0, 0},
+	/* SIOCSIWENCODE */
+	{ IW_HEADER_TYPE_POINT, 4, 1, 0, IW_ENCODING_TOKEN_MAX, IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT},
+	/* SIOCGIWENCODE */
+	{ IW_HEADER_TYPE_POINT, 0, 1, 0, IW_ENCODING_TOKEN_MAX, IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT},
+	/* SIOCSIWPOWER */
+	{ IW_HEADER_TYPE_PARAM, 0, 0, 0, 0, 0},
+	/* SIOCGIWPOWER */
+	{ IW_HEADER_TYPE_PARAM, 0, 0, 0, 0, 0},
+};
+
+/* Size (in bytes) of the various private data types */
+char priv_type_size[] = { 0, 1, 1, 0, 4, 4, 0, 0 };
+
+/************************ 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.
+ * Called from various place, so make sure it remains efficient.
+ */
+static inline iw_handler get_handler(struct net_device *dev,
+				     unsigned int cmd)
+{
+	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 inline struct iw_statistics *get_wireless_stats(struct net_device *dev)
+{
+	return (dev->get_wireless_stats ?
+		dev->get_wireless_stats(dev) :
+		(struct iw_statistics *) NULL);
+	/* In the future, get_wireless_stats may move from 'struct net_device'
+	 * to 'struct iw_handler_def', to de-bloat struct net_device.
+	 * Definitely worse a thought... */
+}
+
+/* ---------------------------------------------------------------- */
+/*
+ * 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 inline 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 */
+}
+
+/* ---------------------------------------------------------------- */
+/*
+ * Number 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 * priv_type_size[type];
+}
+
+
+/******************** /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 inline int sprintf_wireless_stats(char *buffer, struct net_device *dev)
+{
+	/* Get stats from the driver */
+	struct iw_statistics *stats;
+	int size;
+
+	stats = get_wireless_stats(dev);
+	if (stats != (struct iw_statistics *) NULL) {
+		size = sprintf(buffer,
+			       "%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 & 1 ? '.' : ' ',
+			       stats->qual.level,
+			       stats->qual.updated & 2 ? '.' : ' ',
+			       stats->qual.noise,
+			       stats->qual.updated & 4 ? '.' : ' ',
+			       stats->discard.nwid,
+			       stats->discard.code,
+			       stats->discard.fragment,
+			       stats->discard.retries,
+			       stats->discard.misc,
+			       stats->miss.beacon);
+		stats->qual.updated = 0;
+	}
+	else
+		size = 0;
+
+	return size;
+}
+
+/* ---------------------------------------------------------------- */
+/*
+ * Print info for /proc/net/wireless (print all entries)
+ */
+int dev_get_wireless_info(char * buffer, char **start, off_t offset,
+			  int length)
+{
+	int		len = 0;
+	off_t		begin = 0;
+	off_t		pos = 0;
+	int		size;
+	
+	struct net_device *	dev;
+
+	size = sprintf(buffer,
+		       "Inter-| sta-|   Quality        |   Discarded packets               | Missed\n"
+		       " face | tus | link level noise |  nwid  crypt   frag  retry   misc | beacon\n"
+			);
+	
+	pos += size;
+	len += size;
+
+	read_lock(&dev_base_lock);
+	for (dev = dev_base; dev != NULL; dev = dev->next) {
+		size = sprintf_wireless_stats(buffer + len, dev);
+		len += size;
+		pos = begin + len;
+
+		if (pos < offset) {
+			len = 0;
+			begin = pos;
+		}
+		if (pos > offset + length)
+			break;
+	}
+	read_unlock(&dev_base_lock);
+
+	*start = buffer + (offset - begin);	/* Start of wanted data */
+	len -= (offset - begin);		/* Start slop */
+	if (len > length)
+		len = length;			/* Ending slop */
+	if (len < 0)
+		len = 0;
+
+	return len;
+}
+#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.
+ */
+
+/* ---------------------------------------------------------------- */
+/*
+ *	Allow programatic access to /proc/net/wireless even if /proc
+ *	doesn't exist... Also more efficient...
+ */
+static inline int dev_iwstats(struct net_device *dev, struct ifreq *ifr)
+{
+	/* Get stats from the driver */
+	struct iw_statistics *stats;
+
+	stats = get_wireless_stats(dev);
+	if (stats != (struct iw_statistics *) NULL) {
+		struct iwreq *	wrq = (struct iwreq *)ifr;
+
+		/* Copy statistics to the user buffer */
+		if(copy_to_user(wrq->u.data.pointer, stats,
+				sizeof(struct iw_statistics)))
+			return -EFAULT;
+
+		/* Check if we need to clear the update flag */
+		if(wrq->u.data.flags != 0)
+			stats->qual.updated = 0;
+		return 0;
+	} else
+		return -EOPNOTSUPP;
+}
+
+/* ---------------------------------------------------------------- */
+/*
+ * Export the driver private handler definition
+ * They will be picked up by tools like iwpriv...
+ */
+static inline int ioctl_export_private(struct net_device *	dev,
+				       struct ifreq *		ifr)
+{
+	struct iwreq *				iwr = (struct iwreq *) ifr;
+
+	/* 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 NULL pointer */
+	if(iwr->u.data.pointer == NULL)
+		return -EFAULT;
+#ifdef WE_STRICT_WRITE
+	/* Check if there is enough buffer up there */
+	if(iwr->u.data.length < (SIOCIWLASTPRIV - SIOCIWFIRSTPRIV + 1))
+		return -E2BIG;
+#endif	/* WE_STRICT_WRITE */
+
+	/* Set the number of available ioctls. */
+	iwr->u.data.length = dev->wireless_handlers->num_private_args;
+
+	/* Copy structure to the user buffer. */
+	if (copy_to_user(iwr->u.data.pointer,
+			 dev->wireless_handlers->private_args,
+			 sizeof(struct iw_priv_args) * iwr->u.data.length))
+		return -EFAULT;
+
+	return 0;
+}
+
+/* ---------------------------------------------------------------- */
+/*
+ * 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 inline 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 */
+	descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
+
+#ifdef WE_IOCTL_DEBUG
+	printk(KERN_DEBUG "%s : Found standard handler for 0x%04X\n",
+	       ifr->ifr_name, cmd);
+	printk(KERN_DEBUG "Header type : %d, token type : %d, token_size : %d, max_token : %d\n", descr->header_type, descr->token_type, descr->token_size, descr->max_tokens);
+#endif	/* WE_IOCTL_DEBUG */
+
+	/* 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);
+	} 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;
+			/* 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;
+#ifdef WE_STRICT_WRITE
+			/* Check if there is enough buffer up there */
+			if(iwr->u.data.length < descr->max_tokens)
+				return -E2BIG;
+#endif	/* WE_STRICT_WRITE */
+		}
+
+#ifdef WE_IOCTL_DEBUG
+		printk(KERN_DEBUG "Malloc %d bytes\n",
+		       descr->max_tokens * descr->token_size);
+#endif	/* WE_IOCTL_DEBUG */
+
+		/* Always allocate for max space. Easier, and won't last
+		 * long... */
+		extra = kmalloc(descr->max_tokens * descr->token_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;
+			}
+#ifdef WE_IOCTL_DEBUG
+			printk(KERN_DEBUG "Got %d bytes\n",
+			       iwr->u.data.length * descr->token_size);
+#endif	/* WE_IOCTL_DEBUG */
+		}
+
+		/* 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)) {
+			err = copy_to_user(iwr->u.data.pointer, extra,
+					   iwr->u.data.length *
+					   descr->token_size);
+			if (err)
+				ret =  -EFAULT;				   
+#ifdef WE_IOCTL_DEBUG
+			printk(KERN_DEBUG "Wrote %d bytes\n",
+			       iwr->u.data.length * descr->token_size);
+#endif	/* WE_IOCTL_DEBUG */
+		}
+
+		/* 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 inline int ioctl_private_call(struct net_device *	dev,
+				     struct ifreq *		ifr,
+				     unsigned int		cmd,
+				     iw_handler		handler)
+{
+	struct iwreq *			iwr = (struct iwreq *) ifr;
+	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;
+		}
+
+#ifdef WE_IOCTL_DEBUG
+	printk(KERN_DEBUG "%s : Found private handler for 0x%04X\n",
+	       ifr->ifr_name, cmd);
+	if(descr) {
+		printk(KERN_DEBUG "Name %s, set %X, get %X\n",
+		       descr->name, descr->set_args, descr->get_args);
+	}
+#endif	/* WE_IOCTL_DEBUG */
+
+	/* Compute the size of the set/get arguments */
+	if(descr != NULL) {
+		if(IW_IS_SET(cmd)) {
+			/* 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 < IFNAMSIZ))
+				extra_size = 0;
+		} else {
+			/* Size of set 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 {
+			/* Check NULL pointer */
+			if(iwr->u.data.pointer == NULL)
+				return -EFAULT;
+		}
+
+#ifdef WE_IOCTL_DEBUG
+		printk(KERN_DEBUG "Malloc %d bytes\n", extra_size);
+#endif	/* WE_IOCTL_DEBUG */
+
+		/* 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;
+			}
+#ifdef WE_IOCTL_DEBUG
+			printk(KERN_DEBUG "Got %d elem\n", iwr->u.data.length);
+#endif	/* WE_IOCTL_DEBUG */
+		}
+
+		/* 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)) {
+			err = copy_to_user(iwr->u.data.pointer, extra,
+					   extra_size);
+			if (err)
+				ret =  -EFAULT;				   
+#ifdef WE_IOCTL_DEBUG
+			printk(KERN_DEBUG "Wrote %d elem\n",
+			       iwr->u.data.length);
+#endif	/* WE_IOCTL_DEBUG */
+		}
+
+		/* 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. Called from the main networking code
+ * (dev_ioctl() in net/core/dev.c).
+ * Check the type of IOCTL and call the appropriate wrapper...
+ */
+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) */
+	switch(cmd) 
+	{
+		case SIOCGIWSTATS:
+			/* Get Wireless Stats */
+			return dev_iwstats(dev, ifr);
+
+		case SIOCGIWPRIV:
+			/* Check if we have some wireless handlers defined */
+			if(dev->wireless_handlers != NULL) {
+				/* We export to user space the definition of
+				 * the private handler ourselves */
+				return ioctl_export_private(dev, ifr);
+			}
+			// ## Fall-through for old API ##
+		default:
+			/* Generic IOCTL */
+			/* Basic check */
+			if (!netif_device_present(dev))
+				return -ENODEV;
+			/* New driver API : try to find the handler */
+			handler = get_handler(dev, cmd);
+			if(handler != NULL) {
+				/* 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;
+	}
+	/* Not reached */
+	return -EINVAL;
+}