forked from openbmc/linux
-
Notifications
You must be signed in to change notification settings - Fork 5
/
Copy pathfs_context.c
1584 lines (1440 loc) · 39.4 KB
/
fs_context.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
// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/fs/nfs/fs_context.c
*
* Copyright (C) 1992 Rick Sladkey
* Conversion to new mount api Copyright (C) David Howells
*
* NFS mount handling.
*
* Split from fs/nfs/super.c by David Howells <dhowells@redhat.com>
*/
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/nfs4_mount.h>
#include "nfs.h"
#include "internal.h"
#define NFSDBG_FACILITY NFSDBG_MOUNT
#if IS_ENABLED(CONFIG_NFS_V3)
#define NFS_DEFAULT_VERSION 3
#else
#define NFS_DEFAULT_VERSION 2
#endif
#define NFS_MAX_CONNECTIONS 16
enum nfs_param {
Opt_ac,
Opt_acdirmax,
Opt_acdirmin,
Opt_acl,
Opt_acregmax,
Opt_acregmin,
Opt_actimeo,
Opt_addr,
Opt_bg,
Opt_bsize,
Opt_clientaddr,
Opt_cto,
Opt_fg,
Opt_fscache,
Opt_fscache_flag,
Opt_hard,
Opt_intr,
Opt_local_lock,
Opt_lock,
Opt_lookupcache,
Opt_migration,
Opt_minorversion,
Opt_mountaddr,
Opt_mounthost,
Opt_mountport,
Opt_mountproto,
Opt_mountvers,
Opt_namelen,
Opt_nconnect,
Opt_max_connect,
Opt_port,
Opt_posix,
Opt_proto,
Opt_rdirplus,
Opt_rdma,
Opt_resvport,
Opt_retrans,
Opt_retry,
Opt_rsize,
Opt_sec,
Opt_sharecache,
Opt_sloppy,
Opt_soft,
Opt_softerr,
Opt_softreval,
Opt_source,
Opt_tcp,
Opt_timeo,
Opt_udp,
Opt_v,
Opt_vers,
Opt_wsize,
Opt_write,
};
enum {
Opt_local_lock_all,
Opt_local_lock_flock,
Opt_local_lock_none,
Opt_local_lock_posix,
};
static const struct constant_table nfs_param_enums_local_lock[] = {
{ "all", Opt_local_lock_all },
{ "flock", Opt_local_lock_flock },
{ "posix", Opt_local_lock_posix },
{ "none", Opt_local_lock_none },
{}
};
enum {
Opt_lookupcache_all,
Opt_lookupcache_none,
Opt_lookupcache_positive,
};
static const struct constant_table nfs_param_enums_lookupcache[] = {
{ "all", Opt_lookupcache_all },
{ "none", Opt_lookupcache_none },
{ "pos", Opt_lookupcache_positive },
{ "positive", Opt_lookupcache_positive },
{}
};
enum {
Opt_write_lazy,
Opt_write_eager,
Opt_write_wait,
};
static const struct constant_table nfs_param_enums_write[] = {
{ "lazy", Opt_write_lazy },
{ "eager", Opt_write_eager },
{ "wait", Opt_write_wait },
{}
};
static const struct fs_parameter_spec nfs_fs_parameters[] = {
fsparam_flag_no("ac", Opt_ac),
fsparam_u32 ("acdirmax", Opt_acdirmax),
fsparam_u32 ("acdirmin", Opt_acdirmin),
fsparam_flag_no("acl", Opt_acl),
fsparam_u32 ("acregmax", Opt_acregmax),
fsparam_u32 ("acregmin", Opt_acregmin),
fsparam_u32 ("actimeo", Opt_actimeo),
fsparam_string("addr", Opt_addr),
fsparam_flag ("bg", Opt_bg),
fsparam_u32 ("bsize", Opt_bsize),
fsparam_string("clientaddr", Opt_clientaddr),
fsparam_flag_no("cto", Opt_cto),
fsparam_flag ("fg", Opt_fg),
fsparam_flag_no("fsc", Opt_fscache_flag),
fsparam_string("fsc", Opt_fscache),
fsparam_flag ("hard", Opt_hard),
__fsparam(NULL, "intr", Opt_intr,
fs_param_neg_with_no|fs_param_deprecated, NULL),
fsparam_enum ("local_lock", Opt_local_lock, nfs_param_enums_local_lock),
fsparam_flag_no("lock", Opt_lock),
fsparam_enum ("lookupcache", Opt_lookupcache, nfs_param_enums_lookupcache),
fsparam_flag_no("migration", Opt_migration),
fsparam_u32 ("minorversion", Opt_minorversion),
fsparam_string("mountaddr", Opt_mountaddr),
fsparam_string("mounthost", Opt_mounthost),
fsparam_u32 ("mountport", Opt_mountport),
fsparam_string("mountproto", Opt_mountproto),
fsparam_u32 ("mountvers", Opt_mountvers),
fsparam_u32 ("namlen", Opt_namelen),
fsparam_u32 ("nconnect", Opt_nconnect),
fsparam_u32 ("max_connect", Opt_max_connect),
fsparam_string("nfsvers", Opt_vers),
fsparam_u32 ("port", Opt_port),
fsparam_flag_no("posix", Opt_posix),
fsparam_string("proto", Opt_proto),
fsparam_flag_no("rdirplus", Opt_rdirplus),
fsparam_flag ("rdma", Opt_rdma),
fsparam_flag_no("resvport", Opt_resvport),
fsparam_u32 ("retrans", Opt_retrans),
fsparam_string("retry", Opt_retry),
fsparam_u32 ("rsize", Opt_rsize),
fsparam_string("sec", Opt_sec),
fsparam_flag_no("sharecache", Opt_sharecache),
fsparam_flag ("sloppy", Opt_sloppy),
fsparam_flag ("soft", Opt_soft),
fsparam_flag ("softerr", Opt_softerr),
fsparam_flag ("softreval", Opt_softreval),
fsparam_string("source", Opt_source),
fsparam_flag ("tcp", Opt_tcp),
fsparam_u32 ("timeo", Opt_timeo),
fsparam_flag ("udp", Opt_udp),
fsparam_flag ("v2", Opt_v),
fsparam_flag ("v3", Opt_v),
fsparam_flag ("v4", Opt_v),
fsparam_flag ("v4.0", Opt_v),
fsparam_flag ("v4.1", Opt_v),
fsparam_flag ("v4.2", Opt_v),
fsparam_string("vers", Opt_vers),
fsparam_enum ("write", Opt_write, nfs_param_enums_write),
fsparam_u32 ("wsize", Opt_wsize),
{}
};
enum {
Opt_vers_2,
Opt_vers_3,
Opt_vers_4,
Opt_vers_4_0,
Opt_vers_4_1,
Opt_vers_4_2,
};
static const struct constant_table nfs_vers_tokens[] = {
{ "2", Opt_vers_2 },
{ "3", Opt_vers_3 },
{ "4", Opt_vers_4 },
{ "4.0", Opt_vers_4_0 },
{ "4.1", Opt_vers_4_1 },
{ "4.2", Opt_vers_4_2 },
{}
};
enum {
Opt_xprt_rdma,
Opt_xprt_rdma6,
Opt_xprt_tcp,
Opt_xprt_tcp6,
Opt_xprt_udp,
Opt_xprt_udp6,
nr__Opt_xprt
};
static const struct constant_table nfs_xprt_protocol_tokens[] = {
{ "rdma", Opt_xprt_rdma },
{ "rdma6", Opt_xprt_rdma6 },
{ "tcp", Opt_xprt_tcp },
{ "tcp6", Opt_xprt_tcp6 },
{ "udp", Opt_xprt_udp },
{ "udp6", Opt_xprt_udp6 },
{}
};
enum {
Opt_sec_krb5,
Opt_sec_krb5i,
Opt_sec_krb5p,
Opt_sec_lkey,
Opt_sec_lkeyi,
Opt_sec_lkeyp,
Opt_sec_none,
Opt_sec_spkm,
Opt_sec_spkmi,
Opt_sec_spkmp,
Opt_sec_sys,
nr__Opt_sec
};
static const struct constant_table nfs_secflavor_tokens[] = {
{ "krb5", Opt_sec_krb5 },
{ "krb5i", Opt_sec_krb5i },
{ "krb5p", Opt_sec_krb5p },
{ "lkey", Opt_sec_lkey },
{ "lkeyi", Opt_sec_lkeyi },
{ "lkeyp", Opt_sec_lkeyp },
{ "none", Opt_sec_none },
{ "null", Opt_sec_none },
{ "spkm3", Opt_sec_spkm },
{ "spkm3i", Opt_sec_spkmi },
{ "spkm3p", Opt_sec_spkmp },
{ "sys", Opt_sec_sys },
{}
};
/*
* Sanity-check a server address provided by the mount command.
*
* Address family must be initialized, and address must not be
* the ANY address for that family.
*/
static int nfs_verify_server_address(struct sockaddr *addr)
{
switch (addr->sa_family) {
case AF_INET: {
struct sockaddr_in *sa = (struct sockaddr_in *)addr;
return sa->sin_addr.s_addr != htonl(INADDR_ANY);
}
case AF_INET6: {
struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
return !ipv6_addr_any(sa);
}
}
dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
return 0;
}
#ifdef CONFIG_NFS_DISABLE_UDP_SUPPORT
static bool nfs_server_transport_udp_invalid(const struct nfs_fs_context *ctx)
{
return true;
}
#else
static bool nfs_server_transport_udp_invalid(const struct nfs_fs_context *ctx)
{
if (ctx->version == 4)
return true;
return false;
}
#endif
/*
* Sanity check the NFS transport protocol.
*/
static int nfs_validate_transport_protocol(struct fs_context *fc,
struct nfs_fs_context *ctx)
{
switch (ctx->nfs_server.protocol) {
case XPRT_TRANSPORT_UDP:
if (nfs_server_transport_udp_invalid(ctx))
goto out_invalid_transport_udp;
break;
case XPRT_TRANSPORT_TCP:
case XPRT_TRANSPORT_RDMA:
break;
default:
ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
}
return 0;
out_invalid_transport_udp:
return nfs_invalf(fc, "NFS: Unsupported transport protocol udp");
}
/*
* For text based NFSv2/v3 mounts, the mount protocol transport default
* settings should depend upon the specified NFS transport.
*/
static void nfs_set_mount_transport_protocol(struct nfs_fs_context *ctx)
{
if (ctx->mount_server.protocol == XPRT_TRANSPORT_UDP ||
ctx->mount_server.protocol == XPRT_TRANSPORT_TCP)
return;
switch (ctx->nfs_server.protocol) {
case XPRT_TRANSPORT_UDP:
ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
break;
case XPRT_TRANSPORT_TCP:
case XPRT_TRANSPORT_RDMA:
ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
}
}
/*
* Add 'flavor' to 'auth_info' if not already present.
* Returns true if 'flavor' ends up in the list, false otherwise
*/
static int nfs_auth_info_add(struct fs_context *fc,
struct nfs_auth_info *auth_info,
rpc_authflavor_t flavor)
{
unsigned int i;
unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
/* make sure this flavor isn't already in the list */
for (i = 0; i < auth_info->flavor_len; i++) {
if (flavor == auth_info->flavors[i])
return 0;
}
if (auth_info->flavor_len + 1 >= max_flavor_len)
return nfs_invalf(fc, "NFS: too many sec= flavors");
auth_info->flavors[auth_info->flavor_len++] = flavor;
return 0;
}
/*
* Parse the value of the 'sec=' option.
*/
static int nfs_parse_security_flavors(struct fs_context *fc,
struct fs_parameter *param)
{
struct nfs_fs_context *ctx = nfs_fc2context(fc);
rpc_authflavor_t pseudoflavor;
char *string = param->string, *p;
int ret;
dfprintk(MOUNT, "NFS: parsing %s=%s option\n", param->key, param->string);
while ((p = strsep(&string, ":")) != NULL) {
if (!*p)
continue;
switch (lookup_constant(nfs_secflavor_tokens, p, -1)) {
case Opt_sec_none:
pseudoflavor = RPC_AUTH_NULL;
break;
case Opt_sec_sys:
pseudoflavor = RPC_AUTH_UNIX;
break;
case Opt_sec_krb5:
pseudoflavor = RPC_AUTH_GSS_KRB5;
break;
case Opt_sec_krb5i:
pseudoflavor = RPC_AUTH_GSS_KRB5I;
break;
case Opt_sec_krb5p:
pseudoflavor = RPC_AUTH_GSS_KRB5P;
break;
case Opt_sec_lkey:
pseudoflavor = RPC_AUTH_GSS_LKEY;
break;
case Opt_sec_lkeyi:
pseudoflavor = RPC_AUTH_GSS_LKEYI;
break;
case Opt_sec_lkeyp:
pseudoflavor = RPC_AUTH_GSS_LKEYP;
break;
case Opt_sec_spkm:
pseudoflavor = RPC_AUTH_GSS_SPKM;
break;
case Opt_sec_spkmi:
pseudoflavor = RPC_AUTH_GSS_SPKMI;
break;
case Opt_sec_spkmp:
pseudoflavor = RPC_AUTH_GSS_SPKMP;
break;
default:
return nfs_invalf(fc, "NFS: sec=%s option not recognized", p);
}
ret = nfs_auth_info_add(fc, &ctx->auth_info, pseudoflavor);
if (ret < 0)
return ret;
}
return 0;
}
static int nfs_parse_version_string(struct fs_context *fc,
const char *string)
{
struct nfs_fs_context *ctx = nfs_fc2context(fc);
ctx->flags &= ~NFS_MOUNT_VER3;
switch (lookup_constant(nfs_vers_tokens, string, -1)) {
case Opt_vers_2:
ctx->version = 2;
break;
case Opt_vers_3:
ctx->flags |= NFS_MOUNT_VER3;
ctx->version = 3;
break;
case Opt_vers_4:
/* Backward compatibility option. In future,
* the mount program should always supply
* a NFSv4 minor version number.
*/
ctx->version = 4;
break;
case Opt_vers_4_0:
ctx->version = 4;
ctx->minorversion = 0;
break;
case Opt_vers_4_1:
ctx->version = 4;
ctx->minorversion = 1;
break;
case Opt_vers_4_2:
ctx->version = 4;
ctx->minorversion = 2;
break;
default:
return nfs_invalf(fc, "NFS: Unsupported NFS version");
}
return 0;
}
/*
* Parse a single mount parameter.
*/
static int nfs_fs_context_parse_param(struct fs_context *fc,
struct fs_parameter *param)
{
struct fs_parse_result result;
struct nfs_fs_context *ctx = nfs_fc2context(fc);
unsigned short protofamily, mountfamily;
unsigned int len;
int ret, opt;
dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", param->key);
opt = fs_parse(fc, nfs_fs_parameters, param, &result);
if (opt < 0)
return ctx->sloppy ? 1 : opt;
if (fc->security)
ctx->has_sec_mnt_opts = 1;
switch (opt) {
case Opt_source:
if (fc->source)
return nfs_invalf(fc, "NFS: Multiple sources not supported");
fc->source = param->string;
param->string = NULL;
break;
/*
* boolean options: foo/nofoo
*/
case Opt_soft:
ctx->flags |= NFS_MOUNT_SOFT;
ctx->flags &= ~NFS_MOUNT_SOFTERR;
break;
case Opt_softerr:
ctx->flags |= NFS_MOUNT_SOFTERR | NFS_MOUNT_SOFTREVAL;
ctx->flags &= ~NFS_MOUNT_SOFT;
break;
case Opt_hard:
ctx->flags &= ~(NFS_MOUNT_SOFT |
NFS_MOUNT_SOFTERR |
NFS_MOUNT_SOFTREVAL);
break;
case Opt_softreval:
if (result.negated)
ctx->flags &= ~NFS_MOUNT_SOFTREVAL;
else
ctx->flags &= NFS_MOUNT_SOFTREVAL;
break;
case Opt_posix:
if (result.negated)
ctx->flags &= ~NFS_MOUNT_POSIX;
else
ctx->flags |= NFS_MOUNT_POSIX;
break;
case Opt_cto:
if (result.negated)
ctx->flags |= NFS_MOUNT_NOCTO;
else
ctx->flags &= ~NFS_MOUNT_NOCTO;
break;
case Opt_ac:
if (result.negated)
ctx->flags |= NFS_MOUNT_NOAC;
else
ctx->flags &= ~NFS_MOUNT_NOAC;
break;
case Opt_lock:
if (result.negated) {
ctx->flags |= NFS_MOUNT_NONLM;
ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
} else {
ctx->flags &= ~NFS_MOUNT_NONLM;
ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
}
break;
case Opt_udp:
ctx->flags &= ~NFS_MOUNT_TCP;
ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
break;
case Opt_tcp:
case Opt_rdma:
ctx->flags |= NFS_MOUNT_TCP; /* for side protocols */
ret = xprt_find_transport_ident(param->key);
if (ret < 0)
goto out_bad_transport;
ctx->nfs_server.protocol = ret;
break;
case Opt_acl:
if (result.negated)
ctx->flags |= NFS_MOUNT_NOACL;
else
ctx->flags &= ~NFS_MOUNT_NOACL;
break;
case Opt_rdirplus:
if (result.negated)
ctx->flags |= NFS_MOUNT_NORDIRPLUS;
else
ctx->flags &= ~NFS_MOUNT_NORDIRPLUS;
break;
case Opt_sharecache:
if (result.negated)
ctx->flags |= NFS_MOUNT_UNSHARED;
else
ctx->flags &= ~NFS_MOUNT_UNSHARED;
break;
case Opt_resvport:
if (result.negated)
ctx->flags |= NFS_MOUNT_NORESVPORT;
else
ctx->flags &= ~NFS_MOUNT_NORESVPORT;
break;
case Opt_fscache_flag:
if (result.negated)
ctx->options &= ~NFS_OPTION_FSCACHE;
else
ctx->options |= NFS_OPTION_FSCACHE;
kfree(ctx->fscache_uniq);
ctx->fscache_uniq = NULL;
break;
case Opt_fscache:
ctx->options |= NFS_OPTION_FSCACHE;
kfree(ctx->fscache_uniq);
ctx->fscache_uniq = param->string;
param->string = NULL;
break;
case Opt_migration:
if (result.negated)
ctx->options &= ~NFS_OPTION_MIGRATION;
else
ctx->options |= NFS_OPTION_MIGRATION;
break;
/*
* options that take numeric values
*/
case Opt_port:
if (result.uint_32 > USHRT_MAX)
goto out_of_bounds;
ctx->nfs_server.port = result.uint_32;
break;
case Opt_rsize:
ctx->rsize = result.uint_32;
break;
case Opt_wsize:
ctx->wsize = result.uint_32;
break;
case Opt_bsize:
ctx->bsize = result.uint_32;
break;
case Opt_timeo:
if (result.uint_32 < 1 || result.uint_32 > INT_MAX)
goto out_of_bounds;
ctx->timeo = result.uint_32;
break;
case Opt_retrans:
if (result.uint_32 > INT_MAX)
goto out_of_bounds;
ctx->retrans = result.uint_32;
break;
case Opt_acregmin:
ctx->acregmin = result.uint_32;
break;
case Opt_acregmax:
ctx->acregmax = result.uint_32;
break;
case Opt_acdirmin:
ctx->acdirmin = result.uint_32;
break;
case Opt_acdirmax:
ctx->acdirmax = result.uint_32;
break;
case Opt_actimeo:
ctx->acregmin = result.uint_32;
ctx->acregmax = result.uint_32;
ctx->acdirmin = result.uint_32;
ctx->acdirmax = result.uint_32;
break;
case Opt_namelen:
ctx->namlen = result.uint_32;
break;
case Opt_mountport:
if (result.uint_32 > USHRT_MAX)
goto out_of_bounds;
ctx->mount_server.port = result.uint_32;
break;
case Opt_mountvers:
if (result.uint_32 < NFS_MNT_VERSION ||
result.uint_32 > NFS_MNT3_VERSION)
goto out_of_bounds;
ctx->mount_server.version = result.uint_32;
break;
case Opt_minorversion:
if (result.uint_32 > NFS4_MAX_MINOR_VERSION)
goto out_of_bounds;
ctx->minorversion = result.uint_32;
break;
/*
* options that take text values
*/
case Opt_v:
ret = nfs_parse_version_string(fc, param->key + 1);
if (ret < 0)
return ret;
break;
case Opt_vers:
ret = nfs_parse_version_string(fc, param->string);
if (ret < 0)
return ret;
break;
case Opt_sec:
ret = nfs_parse_security_flavors(fc, param);
if (ret < 0)
return ret;
break;
case Opt_proto:
protofamily = AF_INET;
switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
case Opt_xprt_udp6:
protofamily = AF_INET6;
fallthrough;
case Opt_xprt_udp:
ctx->flags &= ~NFS_MOUNT_TCP;
ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
break;
case Opt_xprt_tcp6:
protofamily = AF_INET6;
fallthrough;
case Opt_xprt_tcp:
ctx->flags |= NFS_MOUNT_TCP;
ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
break;
case Opt_xprt_rdma6:
protofamily = AF_INET6;
fallthrough;
case Opt_xprt_rdma:
/* vector side protocols to TCP */
ctx->flags |= NFS_MOUNT_TCP;
ret = xprt_find_transport_ident(param->string);
if (ret < 0)
goto out_bad_transport;
ctx->nfs_server.protocol = ret;
break;
default:
goto out_bad_transport;
}
ctx->protofamily = protofamily;
break;
case Opt_mountproto:
mountfamily = AF_INET;
switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
case Opt_xprt_udp6:
mountfamily = AF_INET6;
fallthrough;
case Opt_xprt_udp:
ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
break;
case Opt_xprt_tcp6:
mountfamily = AF_INET6;
fallthrough;
case Opt_xprt_tcp:
ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
break;
case Opt_xprt_rdma: /* not used for side protocols */
default:
goto out_bad_transport;
}
ctx->mountfamily = mountfamily;
break;
case Opt_addr:
len = rpc_pton(fc->net_ns, param->string, param->size,
&ctx->nfs_server.address,
sizeof(ctx->nfs_server._address));
if (len == 0)
goto out_invalid_address;
ctx->nfs_server.addrlen = len;
break;
case Opt_clientaddr:
kfree(ctx->client_address);
ctx->client_address = param->string;
param->string = NULL;
break;
case Opt_mounthost:
kfree(ctx->mount_server.hostname);
ctx->mount_server.hostname = param->string;
param->string = NULL;
break;
case Opt_mountaddr:
len = rpc_pton(fc->net_ns, param->string, param->size,
&ctx->mount_server.address,
sizeof(ctx->mount_server._address));
if (len == 0)
goto out_invalid_address;
ctx->mount_server.addrlen = len;
break;
case Opt_nconnect:
if (result.uint_32 < 1 || result.uint_32 > NFS_MAX_CONNECTIONS)
goto out_of_bounds;
ctx->nfs_server.nconnect = result.uint_32;
break;
case Opt_max_connect:
if (result.uint_32 < 1 || result.uint_32 > NFS_MAX_TRANSPORTS)
goto out_of_bounds;
ctx->nfs_server.max_connect = result.uint_32;
break;
case Opt_lookupcache:
switch (result.uint_32) {
case Opt_lookupcache_all:
ctx->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
break;
case Opt_lookupcache_positive:
ctx->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
break;
case Opt_lookupcache_none:
ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
break;
default:
goto out_invalid_value;
}
break;
case Opt_local_lock:
switch (result.uint_32) {
case Opt_local_lock_all:
ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK |
NFS_MOUNT_LOCAL_FCNTL);
break;
case Opt_local_lock_flock:
ctx->flags |= NFS_MOUNT_LOCAL_FLOCK;
break;
case Opt_local_lock_posix:
ctx->flags |= NFS_MOUNT_LOCAL_FCNTL;
break;
case Opt_local_lock_none:
ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
NFS_MOUNT_LOCAL_FCNTL);
break;
default:
goto out_invalid_value;
}
break;
case Opt_write:
switch (result.uint_32) {
case Opt_write_lazy:
ctx->flags &=
~(NFS_MOUNT_WRITE_EAGER | NFS_MOUNT_WRITE_WAIT);
break;
case Opt_write_eager:
ctx->flags |= NFS_MOUNT_WRITE_EAGER;
ctx->flags &= ~NFS_MOUNT_WRITE_WAIT;
break;
case Opt_write_wait:
ctx->flags |=
NFS_MOUNT_WRITE_EAGER | NFS_MOUNT_WRITE_WAIT;
break;
default:
goto out_invalid_value;
}
break;
/*
* Special options
*/
case Opt_sloppy:
ctx->sloppy = true;
dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
break;
}
return 0;
out_invalid_value:
return nfs_invalf(fc, "NFS: Bad mount option value specified");
out_invalid_address:
return nfs_invalf(fc, "NFS: Bad IP address specified");
out_of_bounds:
return nfs_invalf(fc, "NFS: Value for '%s' out of range", param->key);
out_bad_transport:
return nfs_invalf(fc, "NFS: Unrecognized transport protocol");
}
/*
* Split fc->source into "hostname:export_path".
*
* The leftmost colon demarks the split between the server's hostname
* and the export path. If the hostname starts with a left square
* bracket, then it may contain colons.
*
* Note: caller frees hostname and export path, even on error.
*/
static int nfs_parse_source(struct fs_context *fc,
size_t maxnamlen, size_t maxpathlen)
{
struct nfs_fs_context *ctx = nfs_fc2context(fc);
const char *dev_name = fc->source;
size_t len;
const char *end;
if (unlikely(!dev_name || !*dev_name)) {
dfprintk(MOUNT, "NFS: device name not specified\n");
return -EINVAL;
}
/* Is the host name protected with square brakcets? */
if (*dev_name == '[') {
end = strchr(++dev_name, ']');
if (end == NULL || end[1] != ':')
goto out_bad_devname;
len = end - dev_name;
end++;
} else {
const char *comma;
end = strchr(dev_name, ':');
if (end == NULL)
goto out_bad_devname;
len = end - dev_name;
/* kill possible hostname list: not supported */
comma = memchr(dev_name, ',', len);
if (comma)
len = comma - dev_name;
}
if (len > maxnamlen)
goto out_hostname;
kfree(ctx->nfs_server.hostname);
/* N.B. caller will free nfs_server.hostname in all cases */
ctx->nfs_server.hostname = kmemdup_nul(dev_name, len, GFP_KERNEL);
if (!ctx->nfs_server.hostname)
goto out_nomem;
len = strlen(++end);
if (len > maxpathlen)
goto out_path;
ctx->nfs_server.export_path = kmemdup_nul(end, len, GFP_KERNEL);
if (!ctx->nfs_server.export_path)
goto out_nomem;
dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", ctx->nfs_server.export_path);
return 0;
out_bad_devname:
return nfs_invalf(fc, "NFS: device name not in host:path format");
out_nomem:
nfs_errorf(fc, "NFS: not enough memory to parse device name");
return -ENOMEM;
out_hostname:
nfs_errorf(fc, "NFS: server hostname too long");
return -ENAMETOOLONG;
out_path:
nfs_errorf(fc, "NFS: export pathname too long");
return -ENAMETOOLONG;
}
static inline bool is_remount_fc(struct fs_context *fc)
{
return fc->root != NULL;
}
/*
* Parse monolithic NFS2/NFS3 mount data
* - fills in the mount root filehandle
*
* For option strings, user space handles the following behaviors:
*
* + DNS: mapping server host name to IP address ("addr=" option)
*
* + failure mode: how to behave if a mount request can't be handled
* immediately ("fg/bg" option)
*
* + retry: how often to retry a mount request ("retry=" option)
*
* + breaking back: trying proto=udp after proto=tcp, v2 after v3,
* mountproto=tcp after mountproto=udp, and so on
*/
static int nfs23_parse_monolithic(struct fs_context *fc,
struct nfs_mount_data *data)
{
struct nfs_fs_context *ctx = nfs_fc2context(fc);
struct nfs_fh *mntfh = ctx->mntfh;
struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
int ret;
if (data == NULL)
goto out_no_data;
ctx->version = NFS_DEFAULT_VERSION;
switch (data->version) {
case 1:
data->namlen = 0;
fallthrough;
case 2:
data->bsize = 0;
fallthrough;
case 3:
if (data->flags & NFS_MOUNT_VER3)
goto out_no_v3;
data->root.size = NFS2_FHSIZE;
memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
/* Turn off security negotiation */
extra_flags |= NFS_MOUNT_SECFLAVOUR;
fallthrough;
case 4:
if (data->flags & NFS_MOUNT_SECFLAVOUR)
goto out_no_sec;
fallthrough;
case 5:
memset(data->context, 0, sizeof(data->context));
fallthrough;
case 6:
if (data->flags & NFS_MOUNT_VER3) {
if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
goto out_invalid_fh;
mntfh->size = data->root.size;
ctx->version = 3;
} else {
mntfh->size = NFS2_FHSIZE;
ctx->version = 2;
}
memcpy(mntfh->data, data->root.data, mntfh->size);