forked from analogdevicesinc/linux
-
Notifications
You must be signed in to change notification settings - Fork 3
/
wext.c
1657 lines (1465 loc) · 47.5 KB
/
wext.c
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
/*
* This file implement the Wireless Extensions APIs.
*
* Authors : Jean Tourrilhes - HPL - <[email protected]>
* 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 <[email protected]> :
* 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 lose 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 */
};
/************************ 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 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 int adjust_priv_size(__u16 args, struct iw_point *iwp)
{
int num = iwp->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_net(inode, file, &wireless_seq_ops,
sizeof(struct seq_net_private));
}
static const struct file_operations wireless_seq_fops = {
.owner = THIS_MODULE,
.open = wireless_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_net,
};
int wext_proc_init(struct net *net)
{
/* Create /proc/net/wireless entry */
if (!proc_net_fops_create(net, "wireless", S_IRUGO, &wireless_seq_fops))
return -ENOMEM;
return 0;
}
void wext_proc_exit(struct net *net)
{
proc_net_remove(net, "wireless");
}
#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.
*/
/* ---------------------------------------------------------------- */
static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
const struct iw_ioctl_description *descr,
iw_handler handler, struct net_device *dev,
struct iw_request_info *info)
{
int err, extra_size, user_length = 0, essid_compat = 0;
char *extra;
/* Calculate space needed by arguments. Always allocate
* for max space.
*/
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 (iwp->length == descr->max_tokens + 1)
essid_compat = 1;
else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
char essid[IW_ESSID_MAX_SIZE + 1];
err = copy_from_user(essid, iwp->pointer,
iwp->length *
descr->token_size);
if (err)
return -EFAULT;
if (essid[iwp->length - 1] == '\0')
essid_compat = 1;
}
break;
default:
break;
}
iwp->length -= essid_compat;
/* Check what user space is giving us */
if (IW_IS_SET(cmd)) {
/* Check NULL pointer */
if (!iwp->pointer && iwp->length != 0)
return -EFAULT;
/* Check if number of token fits within bounds */
if (iwp->length > descr->max_tokens)
return -E2BIG;
if (iwp->length < descr->min_tokens)
return -EINVAL;
} else {
/* Check NULL pointer */
if (!iwp->pointer)
return -EFAULT;
/* Save user space buffer size for checking */
user_length = iwp->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...
*/
}
}
/* kzalloc() ensures NULL-termination for essid_compat. */
extra = kzalloc(extra_size, GFP_KERNEL);
if (!extra)
return -ENOMEM;
/* If it is a SET, get all the extra data in here */
if (IW_IS_SET(cmd) && (iwp->length != 0)) {
if (copy_from_user(extra, iwp->pointer,
iwp->length *
descr->token_size)) {
err = -EFAULT;
goto out;
}
if (cmd == SIOCSIWENCODEEXT) {
struct iw_encode_ext *ee = (void *) extra;
if (iwp->length < sizeof(*ee) + ee->key_len)
return -EFAULT;
}
}
err = handler(dev, info, (union iwreq_data *) iwp, extra);
iwp->length += essid_compat;
/* If we have something to return to the user */
if (!err && IW_IS_GET(cmd)) {
/* Check if there is enough buffer up there */
if (user_length < iwp->length) {
err = -E2BIG;
goto out;
}
if (copy_to_user(iwp->pointer, extra,
iwp->length *
descr->token_size)) {
err = -EFAULT;
goto out;
}
}
/* Generate an event to notify listeners of the change */
if ((descr->flags & IW_DESCR_FLAG_EVENT) && err == -EIWCOMMIT) {
union iwreq_data *data = (union iwreq_data *) iwp;
if (descr->flags & IW_DESCR_FLAG_RESTRICT)
/* If the event is restricted, don't
* export the payload.
*/
wireless_send_event(dev, cmd, data, NULL);
else
wireless_send_event(dev, cmd, data, extra);
}
out:
kfree(extra);
return err;
}
/*
* 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 iwreq *iwr,
unsigned int cmd,
struct iw_request_info *info,
iw_handler handler)
{
const struct iw_ioctl_description * descr;
int ret = -EINVAL;
/* Get the description of the IOCTL */
if ((cmd - SIOCIWFIRST) >= standard_ioctl_num)
return -EOPNOTSUPP;
descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
/* 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 {
ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
handler, dev, info);
}
/* 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 get_priv_descr_and_size(struct net_device *dev, unsigned int cmd,
const struct iw_priv_args **descrp)
{
const struct iw_priv_args *descr;
int i, extra_size;
descr = NULL;
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;
}
}
extra_size = 0;
if (descr) {
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;
}
}
*descrp = descr;
return extra_size;
}
static int ioctl_private_iw_point(struct iw_point *iwp, unsigned int cmd,
const struct iw_priv_args *descr,
iw_handler handler, struct net_device *dev,
struct iw_request_info *info, int extra_size)
{
char *extra;
int err;
/* Check what user space is giving us */
if (IW_IS_SET(cmd)) {
if (!iwp->pointer && iwp->length != 0)
return -EFAULT;
if (iwp->length > (descr->set_args & IW_PRIV_SIZE_MASK))
return -E2BIG;
} else if (!iwp->pointer)
return -EFAULT;
extra = kmalloc(extra_size, GFP_KERNEL);
if (!extra)
return -ENOMEM;
/* If it is a SET, get all the extra data in here */
if (IW_IS_SET(cmd) && (iwp->length != 0)) {
if (copy_from_user(extra, iwp->pointer, extra_size)) {
err = -EFAULT;
goto out;
}
}
/* Call the handler */
err = handler(dev, info, (union iwreq_data *) iwp, extra);
/* If we have something to return to the user */
if (!err && 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, iwp);
if (copy_to_user(iwp->pointer, extra, extra_size))
err = -EFAULT;
}
out:
kfree(extra);
return err;
}
static int ioctl_private_call(struct net_device *dev, struct iwreq *iwr,
unsigned int cmd, struct iw_request_info *info,
iw_handler handler)
{
int extra_size = 0, ret = -EINVAL;
const struct iw_priv_args *descr;
extra_size = get_priv_descr_and_size(dev, cmd, &descr);
/* Check if we have a pointer to user space data or not. */
if (extra_size == 0) {
/* No extra arguments. Trivial to handle */