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WIP FPC-III support
[linux/fpc-iii.git] / fs / nfs / fs_context.c
blob06894bcdea2db6321a86e410bd2a81ba384437a0
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/fs/nfs/fs_context.c
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 * Conversion to new mount api Copyright (C) David Howells
7 *
8 * NFS mount handling.
9 *
10 * Split from fs/nfs/super.c by David Howells <dhowells@redhat.com>
11 */
12
13 #include <linux/module.h>
14 #include <linux/fs.h>
15 #include <linux/fs_context.h>
16 #include <linux/fs_parser.h>
17 #include <linux/nfs_fs.h>
18 #include <linux/nfs_mount.h>
19 #include <linux/nfs4_mount.h>
20 #include "nfs.h"
21 #include "internal.h"
22
23 #define NFSDBG_FACILITY NFSDBG_MOUNT
24
25 #if IS_ENABLED(CONFIG_NFS_V3)
26 #define NFS_DEFAULT_VERSION 3
27 #else
28 #define NFS_DEFAULT_VERSION 2
29 #endif
30
31 #define NFS_MAX_CONNECTIONS 16
32
33 enum nfs_param {
34 Opt_ac,
35 Opt_acdirmax,
36 Opt_acdirmin,
37 Opt_acl,
38 Opt_acregmax,
39 Opt_acregmin,
40 Opt_actimeo,
41 Opt_addr,
42 Opt_bg,
43 Opt_bsize,
44 Opt_clientaddr,
45 Opt_cto,
46 Opt_fg,
47 Opt_fscache,
48 Opt_fscache_flag,
49 Opt_hard,
50 Opt_intr,
51 Opt_local_lock,
52 Opt_lock,
53 Opt_lookupcache,
54 Opt_migration,
55 Opt_minorversion,
56 Opt_mountaddr,
57 Opt_mounthost,
58 Opt_mountport,
59 Opt_mountproto,
60 Opt_mountvers,
61 Opt_namelen,
62 Opt_nconnect,
63 Opt_port,
64 Opt_posix,
65 Opt_proto,
66 Opt_rdirplus,
67 Opt_rdma,
68 Opt_resvport,
69 Opt_retrans,
70 Opt_retry,
71 Opt_rsize,
72 Opt_sec,
73 Opt_sharecache,
74 Opt_sloppy,
75 Opt_soft,
76 Opt_softerr,
77 Opt_softreval,
78 Opt_source,
79 Opt_tcp,
80 Opt_timeo,
81 Opt_udp,
82 Opt_v,
83 Opt_vers,
84 Opt_wsize,
85 };
86
87 enum {
88 Opt_local_lock_all,
89 Opt_local_lock_flock,
90 Opt_local_lock_none,
91 Opt_local_lock_posix,
92 };
93
94 static const struct constant_table nfs_param_enums_local_lock[] = {
95 { "all", Opt_local_lock_all },
96 { "flock", Opt_local_lock_flock },
97 { "posix", Opt_local_lock_posix },
98 { "none", Opt_local_lock_none },
99 {}
100 };
101
102 enum {
103 Opt_lookupcache_all,
104 Opt_lookupcache_none,
105 Opt_lookupcache_positive,
106 };
107
108 static const struct constant_table nfs_param_enums_lookupcache[] = {
109 { "all", Opt_lookupcache_all },
110 { "none", Opt_lookupcache_none },
111 { "pos", Opt_lookupcache_positive },
112 { "positive", Opt_lookupcache_positive },
113 {}
114 };
115
116 static const struct fs_parameter_spec nfs_fs_parameters[] = {
117 fsparam_flag_no("ac", Opt_ac),
118 fsparam_u32 ("acdirmax", Opt_acdirmax),
119 fsparam_u32 ("acdirmin", Opt_acdirmin),
120 fsparam_flag_no("acl", Opt_acl),
121 fsparam_u32 ("acregmax", Opt_acregmax),
122 fsparam_u32 ("acregmin", Opt_acregmin),
123 fsparam_u32 ("actimeo", Opt_actimeo),
124 fsparam_string("addr", Opt_addr),
125 fsparam_flag ("bg", Opt_bg),
126 fsparam_u32 ("bsize", Opt_bsize),
127 fsparam_string("clientaddr", Opt_clientaddr),
128 fsparam_flag_no("cto", Opt_cto),
129 fsparam_flag ("fg", Opt_fg),
130 fsparam_flag_no("fsc", Opt_fscache_flag),
131 fsparam_string("fsc", Opt_fscache),
132 fsparam_flag ("hard", Opt_hard),
133 __fsparam(NULL, "intr", Opt_intr,
134 fs_param_neg_with_no|fs_param_deprecated, NULL),
135 fsparam_enum ("local_lock", Opt_local_lock, nfs_param_enums_local_lock),
136 fsparam_flag_no("lock", Opt_lock),
137 fsparam_enum ("lookupcache", Opt_lookupcache, nfs_param_enums_lookupcache),
138 fsparam_flag_no("migration", Opt_migration),
139 fsparam_u32 ("minorversion", Opt_minorversion),
140 fsparam_string("mountaddr", Opt_mountaddr),
141 fsparam_string("mounthost", Opt_mounthost),
142 fsparam_u32 ("mountport", Opt_mountport),
143 fsparam_string("mountproto", Opt_mountproto),
144 fsparam_u32 ("mountvers", Opt_mountvers),
145 fsparam_u32 ("namlen", Opt_namelen),
146 fsparam_u32 ("nconnect", Opt_nconnect),
147 fsparam_string("nfsvers", Opt_vers),
148 fsparam_u32 ("port", Opt_port),
149 fsparam_flag_no("posix", Opt_posix),
150 fsparam_string("proto", Opt_proto),
151 fsparam_flag_no("rdirplus", Opt_rdirplus),
152 fsparam_flag ("rdma", Opt_rdma),
153 fsparam_flag_no("resvport", Opt_resvport),
154 fsparam_u32 ("retrans", Opt_retrans),
155 fsparam_string("retry", Opt_retry),
156 fsparam_u32 ("rsize", Opt_rsize),
157 fsparam_string("sec", Opt_sec),
158 fsparam_flag_no("sharecache", Opt_sharecache),
159 fsparam_flag ("sloppy", Opt_sloppy),
160 fsparam_flag ("soft", Opt_soft),
161 fsparam_flag ("softerr", Opt_softerr),
162 fsparam_flag ("softreval", Opt_softreval),
163 fsparam_string("source", Opt_source),
164 fsparam_flag ("tcp", Opt_tcp),
165 fsparam_u32 ("timeo", Opt_timeo),
166 fsparam_flag ("udp", Opt_udp),
167 fsparam_flag ("v2", Opt_v),
168 fsparam_flag ("v3", Opt_v),
169 fsparam_flag ("v4", Opt_v),
170 fsparam_flag ("v4.0", Opt_v),
171 fsparam_flag ("v4.1", Opt_v),
172 fsparam_flag ("v4.2", Opt_v),
173 fsparam_string("vers", Opt_vers),
174 fsparam_u32 ("wsize", Opt_wsize),
175 {}
176 };
177
178 enum {
179 Opt_vers_2,
180 Opt_vers_3,
181 Opt_vers_4,
182 Opt_vers_4_0,
183 Opt_vers_4_1,
184 Opt_vers_4_2,
185 };
186
187 static const struct constant_table nfs_vers_tokens[] = {
188 { "2", Opt_vers_2 },
189 { "3", Opt_vers_3 },
190 { "4", Opt_vers_4 },
191 { "4.0", Opt_vers_4_0 },
192 { "4.1", Opt_vers_4_1 },
193 { "4.2", Opt_vers_4_2 },
194 {}
195 };
196
197 enum {
198 Opt_xprt_rdma,
199 Opt_xprt_rdma6,
200 Opt_xprt_tcp,
201 Opt_xprt_tcp6,
202 Opt_xprt_udp,
203 Opt_xprt_udp6,
204 nr__Opt_xprt
205 };
206
207 static const struct constant_table nfs_xprt_protocol_tokens[] = {
208 { "rdma", Opt_xprt_rdma },
209 { "rdma6", Opt_xprt_rdma6 },
210 { "tcp", Opt_xprt_tcp },
211 { "tcp6", Opt_xprt_tcp6 },
212 { "udp", Opt_xprt_udp },
213 { "udp6", Opt_xprt_udp6 },
214 {}
215 };
216
217 enum {
218 Opt_sec_krb5,
219 Opt_sec_krb5i,
220 Opt_sec_krb5p,
221 Opt_sec_lkey,
222 Opt_sec_lkeyi,
223 Opt_sec_lkeyp,
224 Opt_sec_none,
225 Opt_sec_spkm,
226 Opt_sec_spkmi,
227 Opt_sec_spkmp,
228 Opt_sec_sys,
229 nr__Opt_sec
230 };
231
232 static const struct constant_table nfs_secflavor_tokens[] = {
233 { "krb5", Opt_sec_krb5 },
234 { "krb5i", Opt_sec_krb5i },
235 { "krb5p", Opt_sec_krb5p },
236 { "lkey", Opt_sec_lkey },
237 { "lkeyi", Opt_sec_lkeyi },
238 { "lkeyp", Opt_sec_lkeyp },
239 { "none", Opt_sec_none },
240 { "null", Opt_sec_none },
241 { "spkm3", Opt_sec_spkm },
242 { "spkm3i", Opt_sec_spkmi },
243 { "spkm3p", Opt_sec_spkmp },
244 { "sys", Opt_sec_sys },
245 {}
246 };
247
248 /*
249 * Sanity-check a server address provided by the mount command.
250 *
251 * Address family must be initialized, and address must not be
252 * the ANY address for that family.
253 */
254 static int nfs_verify_server_address(struct sockaddr *addr)
255 {
256 switch (addr->sa_family) {
257 case AF_INET: {
258 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
259 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
260 }
261 case AF_INET6: {
262 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
263 return !ipv6_addr_any(sa);
264 }
265 }
266
267 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
268 return 0;
269 }
270
271 /*
272 * Sanity check the NFS transport protocol.
273 *
274 */
275 static void nfs_validate_transport_protocol(struct nfs_fs_context *ctx)
276 {
277 switch (ctx->nfs_server.protocol) {
278 case XPRT_TRANSPORT_UDP:
279 case XPRT_TRANSPORT_TCP:
280 case XPRT_TRANSPORT_RDMA:
281 break;
282 default:
283 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
284 }
285 }
286
287 /*
288 * For text based NFSv2/v3 mounts, the mount protocol transport default
289 * settings should depend upon the specified NFS transport.
290 */
291 static void nfs_set_mount_transport_protocol(struct nfs_fs_context *ctx)
292 {
293 nfs_validate_transport_protocol(ctx);
294
295 if (ctx->mount_server.protocol == XPRT_TRANSPORT_UDP ||
296 ctx->mount_server.protocol == XPRT_TRANSPORT_TCP)
297 return;
298 switch (ctx->nfs_server.protocol) {
299 case XPRT_TRANSPORT_UDP:
300 ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
301 break;
302 case XPRT_TRANSPORT_TCP:
303 case XPRT_TRANSPORT_RDMA:
304 ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
305 }
306 }
307
308 /*
309 * Add 'flavor' to 'auth_info' if not already present.
310 * Returns true if 'flavor' ends up in the list, false otherwise
311 */
312 static int nfs_auth_info_add(struct fs_context *fc,
313 struct nfs_auth_info *auth_info,
314 rpc_authflavor_t flavor)
315 {
316 unsigned int i;
317 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
318
319 /* make sure this flavor isn't already in the list */
320 for (i = 0; i < auth_info->flavor_len; i++) {
321 if (flavor == auth_info->flavors[i])
322 return 0;
323 }
324
325 if (auth_info->flavor_len + 1 >= max_flavor_len)
326 return nfs_invalf(fc, "NFS: too many sec= flavors");
327
328 auth_info->flavors[auth_info->flavor_len++] = flavor;
329 return 0;
330 }
331
332 /*
333 * Parse the value of the 'sec=' option.
334 */
335 static int nfs_parse_security_flavors(struct fs_context *fc,
336 struct fs_parameter *param)
337 {
338 struct nfs_fs_context *ctx = nfs_fc2context(fc);
339 rpc_authflavor_t pseudoflavor;
340 char *string = param->string, *p;
341 int ret;
342
343 dfprintk(MOUNT, "NFS: parsing %s=%s option\n", param->key, param->string);
344
345 while ((p = strsep(&string, ":")) != NULL) {
346 if (!*p)
347 continue;
348 switch (lookup_constant(nfs_secflavor_tokens, p, -1)) {
349 case Opt_sec_none:
350 pseudoflavor = RPC_AUTH_NULL;
351 break;
352 case Opt_sec_sys:
353 pseudoflavor = RPC_AUTH_UNIX;
354 break;
355 case Opt_sec_krb5:
356 pseudoflavor = RPC_AUTH_GSS_KRB5;
357 break;
358 case Opt_sec_krb5i:
359 pseudoflavor = RPC_AUTH_GSS_KRB5I;
360 break;
361 case Opt_sec_krb5p:
362 pseudoflavor = RPC_AUTH_GSS_KRB5P;
363 break;
364 case Opt_sec_lkey:
365 pseudoflavor = RPC_AUTH_GSS_LKEY;
366 break;
367 case Opt_sec_lkeyi:
368 pseudoflavor = RPC_AUTH_GSS_LKEYI;
369 break;
370 case Opt_sec_lkeyp:
371 pseudoflavor = RPC_AUTH_GSS_LKEYP;
372 break;
373 case Opt_sec_spkm:
374 pseudoflavor = RPC_AUTH_GSS_SPKM;
375 break;
376 case Opt_sec_spkmi:
377 pseudoflavor = RPC_AUTH_GSS_SPKMI;
378 break;
379 case Opt_sec_spkmp:
380 pseudoflavor = RPC_AUTH_GSS_SPKMP;
381 break;
382 default:
383 return nfs_invalf(fc, "NFS: sec=%s option not recognized", p);
384 }
385
386 ret = nfs_auth_info_add(fc, &ctx->auth_info, pseudoflavor);
387 if (ret < 0)
388 return ret;
389 }
390
391 return 0;
392 }
393
394 static int nfs_parse_version_string(struct fs_context *fc,
395 const char *string)
396 {
397 struct nfs_fs_context *ctx = nfs_fc2context(fc);
398
399 ctx->flags &= ~NFS_MOUNT_VER3;
400 switch (lookup_constant(nfs_vers_tokens, string, -1)) {
401 case Opt_vers_2:
402 ctx->version = 2;
403 break;
404 case Opt_vers_3:
405 ctx->flags |= NFS_MOUNT_VER3;
406 ctx->version = 3;
407 break;
408 case Opt_vers_4:
409 /* Backward compatibility option. In future,
410 * the mount program should always supply
411 * a NFSv4 minor version number.
412 */
413 ctx->version = 4;
414 break;
415 case Opt_vers_4_0:
416 ctx->version = 4;
417 ctx->minorversion = 0;
418 break;
419 case Opt_vers_4_1:
420 ctx->version = 4;
421 ctx->minorversion = 1;
422 break;
423 case Opt_vers_4_2:
424 ctx->version = 4;
425 ctx->minorversion = 2;
426 break;
427 default:
428 return nfs_invalf(fc, "NFS: Unsupported NFS version");
429 }
430 return 0;
431 }
432
433 /*
434 * Parse a single mount parameter.
435 */
436 static int nfs_fs_context_parse_param(struct fs_context *fc,
437 struct fs_parameter *param)
438 {
439 struct fs_parse_result result;
440 struct nfs_fs_context *ctx = nfs_fc2context(fc);
441 unsigned short protofamily, mountfamily;
442 unsigned int len;
443 int ret, opt;
444
445 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", param->key);
446
447 opt = fs_parse(fc, nfs_fs_parameters, param, &result);
448 if (opt < 0)
449 return ctx->sloppy ? 1 : opt;
450
451 switch (opt) {
452 case Opt_source:
453 if (fc->source)
454 return nfs_invalf(fc, "NFS: Multiple sources not supported");
455 fc->source = param->string;
456 param->string = NULL;
457 break;
458
459 /*
460 * boolean options: foo/nofoo
461 */
462 case Opt_soft:
463 ctx->flags |= NFS_MOUNT_SOFT;
464 ctx->flags &= ~NFS_MOUNT_SOFTERR;
465 break;
466 case Opt_softerr:
467 ctx->flags |= NFS_MOUNT_SOFTERR | NFS_MOUNT_SOFTREVAL;
468 ctx->flags &= ~NFS_MOUNT_SOFT;
469 break;
470 case Opt_hard:
471 ctx->flags &= ~(NFS_MOUNT_SOFT |
472 NFS_MOUNT_SOFTERR |
473 NFS_MOUNT_SOFTREVAL);
474 break;
475 case Opt_softreval:
476 if (result.negated)
477 ctx->flags &= ~NFS_MOUNT_SOFTREVAL;
478 else
479 ctx->flags &= NFS_MOUNT_SOFTREVAL;
480 break;
481 case Opt_posix:
482 if (result.negated)
483 ctx->flags &= ~NFS_MOUNT_POSIX;
484 else
485 ctx->flags |= NFS_MOUNT_POSIX;
486 break;
487 case Opt_cto:
488 if (result.negated)
489 ctx->flags |= NFS_MOUNT_NOCTO;
490 else
491 ctx->flags &= ~NFS_MOUNT_NOCTO;
492 break;
493 case Opt_ac:
494 if (result.negated)
495 ctx->flags |= NFS_MOUNT_NOAC;
496 else
497 ctx->flags &= ~NFS_MOUNT_NOAC;
498 break;
499 case Opt_lock:
500 if (result.negated) {
501 ctx->flags |= NFS_MOUNT_NONLM;
502 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
503 } else {
504 ctx->flags &= ~NFS_MOUNT_NONLM;
505 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
506 }
507 break;
508 case Opt_udp:
509 ctx->flags &= ~NFS_MOUNT_TCP;
510 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
511 break;
512 case Opt_tcp:
513 case Opt_rdma:
514 ctx->flags |= NFS_MOUNT_TCP; /* for side protocols */
515 ret = xprt_find_transport_ident(param->key);
516 if (ret < 0)
517 goto out_bad_transport;
518 ctx->nfs_server.protocol = ret;
519 break;
520 case Opt_acl:
521 if (result.negated)
522 ctx->flags |= NFS_MOUNT_NOACL;
523 else
524 ctx->flags &= ~NFS_MOUNT_NOACL;
525 break;
526 case Opt_rdirplus:
527 if (result.negated)
528 ctx->flags |= NFS_MOUNT_NORDIRPLUS;
529 else
530 ctx->flags &= ~NFS_MOUNT_NORDIRPLUS;
531 break;
532 case Opt_sharecache:
533 if (result.negated)
534 ctx->flags |= NFS_MOUNT_UNSHARED;
535 else
536 ctx->flags &= ~NFS_MOUNT_UNSHARED;
537 break;
538 case Opt_resvport:
539 if (result.negated)
540 ctx->flags |= NFS_MOUNT_NORESVPORT;
541 else
542 ctx->flags &= ~NFS_MOUNT_NORESVPORT;
543 break;
544 case Opt_fscache_flag:
545 if (result.negated)
546 ctx->options &= ~NFS_OPTION_FSCACHE;
547 else
548 ctx->options |= NFS_OPTION_FSCACHE;
549 kfree(ctx->fscache_uniq);
550 ctx->fscache_uniq = NULL;
551 break;
552 case Opt_fscache:
553 ctx->options |= NFS_OPTION_FSCACHE;
554 kfree(ctx->fscache_uniq);
555 ctx->fscache_uniq = param->string;
556 param->string = NULL;
557 break;
558 case Opt_migration:
559 if (result.negated)
560 ctx->options &= ~NFS_OPTION_MIGRATION;
561 else
562 ctx->options |= NFS_OPTION_MIGRATION;
563 break;
564
565 /*
566 * options that take numeric values
567 */
568 case Opt_port:
569 if (result.uint_32 > USHRT_MAX)
570 goto out_of_bounds;
571 ctx->nfs_server.port = result.uint_32;
572 break;
573 case Opt_rsize:
574 ctx->rsize = result.uint_32;
575 break;
576 case Opt_wsize:
577 ctx->wsize = result.uint_32;
578 break;
579 case Opt_bsize:
580 ctx->bsize = result.uint_32;
581 break;
582 case Opt_timeo:
583 if (result.uint_32 < 1 || result.uint_32 > INT_MAX)
584 goto out_of_bounds;
585 ctx->timeo = result.uint_32;
586 break;
587 case Opt_retrans:
588 if (result.uint_32 > INT_MAX)
589 goto out_of_bounds;
590 ctx->retrans = result.uint_32;
591 break;
592 case Opt_acregmin:
593 ctx->acregmin = result.uint_32;
594 break;
595 case Opt_acregmax:
596 ctx->acregmax = result.uint_32;
597 break;
598 case Opt_acdirmin:
599 ctx->acdirmin = result.uint_32;
600 break;
601 case Opt_acdirmax:
602 ctx->acdirmax = result.uint_32;
603 break;
604 case Opt_actimeo:
605 ctx->acregmin = result.uint_32;
606 ctx->acregmax = result.uint_32;
607 ctx->acdirmin = result.uint_32;
608 ctx->acdirmax = result.uint_32;
609 break;
610 case Opt_namelen:
611 ctx->namlen = result.uint_32;
612 break;
613 case Opt_mountport:
614 if (result.uint_32 > USHRT_MAX)
615 goto out_of_bounds;
616 ctx->mount_server.port = result.uint_32;
617 break;
618 case Opt_mountvers:
619 if (result.uint_32 < NFS_MNT_VERSION ||
620 result.uint_32 > NFS_MNT3_VERSION)
621 goto out_of_bounds;
622 ctx->mount_server.version = result.uint_32;
623 break;
624 case Opt_minorversion:
625 if (result.uint_32 > NFS4_MAX_MINOR_VERSION)
626 goto out_of_bounds;
627 ctx->minorversion = result.uint_32;
628 break;
629
630 /*
631 * options that take text values
632 */
633 case Opt_v:
634 ret = nfs_parse_version_string(fc, param->key + 1);
635 if (ret < 0)
636 return ret;
637 break;
638 case Opt_vers:
639 ret = nfs_parse_version_string(fc, param->string);
640 if (ret < 0)
641 return ret;
642 break;
643 case Opt_sec:
644 ret = nfs_parse_security_flavors(fc, param);
645 if (ret < 0)
646 return ret;
647 break;
648
649 case Opt_proto:
650 protofamily = AF_INET;
651 switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
652 case Opt_xprt_udp6:
653 protofamily = AF_INET6;
654 fallthrough;
655 case Opt_xprt_udp:
656 ctx->flags &= ~NFS_MOUNT_TCP;
657 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
658 break;
659 case Opt_xprt_tcp6:
660 protofamily = AF_INET6;
661 fallthrough;
662 case Opt_xprt_tcp:
663 ctx->flags |= NFS_MOUNT_TCP;
664 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
665 break;
666 case Opt_xprt_rdma6:
667 protofamily = AF_INET6;
668 fallthrough;
669 case Opt_xprt_rdma:
670 /* vector side protocols to TCP */
671 ctx->flags |= NFS_MOUNT_TCP;
672 ret = xprt_find_transport_ident(param->string);
673 if (ret < 0)
674 goto out_bad_transport;
675 ctx->nfs_server.protocol = ret;
676 break;
677 default:
678 goto out_bad_transport;
679 }
680
681 ctx->protofamily = protofamily;
682 break;
683
684 case Opt_mountproto:
685 mountfamily = AF_INET;
686 switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
687 case Opt_xprt_udp6:
688 mountfamily = AF_INET6;
689 fallthrough;
690 case Opt_xprt_udp:
691 ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
692 break;
693 case Opt_xprt_tcp6:
694 mountfamily = AF_INET6;
695 fallthrough;
696 case Opt_xprt_tcp:
697 ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
698 break;
699 case Opt_xprt_rdma: /* not used for side protocols */
700 default:
701 goto out_bad_transport;
702 }
703 ctx->mountfamily = mountfamily;
704 break;
705
706 case Opt_addr:
707 len = rpc_pton(fc->net_ns, param->string, param->size,
708 &ctx->nfs_server.address,
709 sizeof(ctx->nfs_server._address));
710 if (len == 0)
711 goto out_invalid_address;
712 ctx->nfs_server.addrlen = len;
713 break;
714 case Opt_clientaddr:
715 kfree(ctx->client_address);
716 ctx->client_address = param->string;
717 param->string = NULL;
718 break;
719 case Opt_mounthost:
720 kfree(ctx->mount_server.hostname);
721 ctx->mount_server.hostname = param->string;
722 param->string = NULL;
723 break;
724 case Opt_mountaddr:
725 len = rpc_pton(fc->net_ns, param->string, param->size,
726 &ctx->mount_server.address,
727 sizeof(ctx->mount_server._address));
728 if (len == 0)
729 goto out_invalid_address;
730 ctx->mount_server.addrlen = len;
731 break;
732 case Opt_nconnect:
733 if (result.uint_32 < 1 || result.uint_32 > NFS_MAX_CONNECTIONS)
734 goto out_of_bounds;
735 ctx->nfs_server.nconnect = result.uint_32;
736 break;
737 case Opt_lookupcache:
738 switch (result.uint_32) {
739 case Opt_lookupcache_all:
740 ctx->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
741 break;
742 case Opt_lookupcache_positive:
743 ctx->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
744 ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
745 break;
746 case Opt_lookupcache_none:
747 ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
748 break;
749 default:
750 goto out_invalid_value;
751 }
752 break;
753 case Opt_local_lock:
754 switch (result.uint_32) {
755 case Opt_local_lock_all:
756 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK |
757 NFS_MOUNT_LOCAL_FCNTL);
758 break;
759 case Opt_local_lock_flock:
760 ctx->flags |= NFS_MOUNT_LOCAL_FLOCK;
761 break;
762 case Opt_local_lock_posix:
763 ctx->flags |= NFS_MOUNT_LOCAL_FCNTL;
764 break;
765 case Opt_local_lock_none:
766 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
767 NFS_MOUNT_LOCAL_FCNTL);
768 break;
769 default:
770 goto out_invalid_value;
771 }
772 break;
773
774 /*
775 * Special options
776 */
777 case Opt_sloppy:
778 ctx->sloppy = true;
779 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
780 break;
781 }
782
783 return 0;
784
785 out_invalid_value:
786 return nfs_invalf(fc, "NFS: Bad mount option value specified");
787 out_invalid_address:
788 return nfs_invalf(fc, "NFS: Bad IP address specified");
789 out_of_bounds:
790 return nfs_invalf(fc, "NFS: Value for '%s' out of range", param->key);
791 out_bad_transport:
792 return nfs_invalf(fc, "NFS: Unrecognized transport protocol");
793 }
794
795 /*
796 * Split fc->source into "hostname:export_path".
797 *
798 * The leftmost colon demarks the split between the server's hostname
799 * and the export path. If the hostname starts with a left square
800 * bracket, then it may contain colons.
801 *
802 * Note: caller frees hostname and export path, even on error.
803 */
804 static int nfs_parse_source(struct fs_context *fc,
805 size_t maxnamlen, size_t maxpathlen)
806 {
807 struct nfs_fs_context *ctx = nfs_fc2context(fc);
808 const char *dev_name = fc->source;
809 size_t len;
810 const char *end;
811
812 if (unlikely(!dev_name || !*dev_name)) {
813 dfprintk(MOUNT, "NFS: device name not specified\n");
814 return -EINVAL;
815 }
816
817 /* Is the host name protected with square brakcets? */
818 if (*dev_name == '[') {
819 end = strchr(++dev_name, ']');
820 if (end == NULL || end[1] != ':')
821 goto out_bad_devname;
822
823 len = end - dev_name;
824 end++;
825 } else {
826 const char *comma;
827
828 end = strchr(dev_name, ':');
829 if (end == NULL)
830 goto out_bad_devname;
831 len = end - dev_name;
832
833 /* kill possible hostname list: not supported */
834 comma = memchr(dev_name, ',', len);
835 if (comma)
836 len = comma - dev_name;
837 }
838
839 if (len > maxnamlen)
840 goto out_hostname;
841
842 kfree(ctx->nfs_server.hostname);
843
844 /* N.B. caller will free nfs_server.hostname in all cases */
845 ctx->nfs_server.hostname = kmemdup_nul(dev_name, len, GFP_KERNEL);
846 if (!ctx->nfs_server.hostname)
847 goto out_nomem;
848 len = strlen(++end);
849 if (len > maxpathlen)
850 goto out_path;
851 ctx->nfs_server.export_path = kmemdup_nul(end, len, GFP_KERNEL);
852 if (!ctx->nfs_server.export_path)
853 goto out_nomem;
854
855 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", ctx->nfs_server.export_path);
856 return 0;
857
858 out_bad_devname:
859 return nfs_invalf(fc, "NFS: device name not in host:path format");
860 out_nomem:
861 nfs_errorf(fc, "NFS: not enough memory to parse device name");
862 return -ENOMEM;
863 out_hostname:
864 nfs_errorf(fc, "NFS: server hostname too long");
865 return -ENAMETOOLONG;
866 out_path:
867 nfs_errorf(fc, "NFS: export pathname too long");
868 return -ENAMETOOLONG;
869 }
870
871 static inline bool is_remount_fc(struct fs_context *fc)
872 {
873 return fc->root != NULL;
874 }
875
876 /*
877 * Parse monolithic NFS2/NFS3 mount data
878 * - fills in the mount root filehandle
879 *
880 * For option strings, user space handles the following behaviors:
881 *
882 * + DNS: mapping server host name to IP address ("addr=" option)
883 *
884 * + failure mode: how to behave if a mount request can't be handled
885 * immediately ("fg/bg" option)
886 *
887 * + retry: how often to retry a mount request ("retry=" option)
888 *
889 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
890 * mountproto=tcp after mountproto=udp, and so on
891 */
892 static int nfs23_parse_monolithic(struct fs_context *fc,
893 struct nfs_mount_data *data)
894 {
895 struct nfs_fs_context *ctx = nfs_fc2context(fc);
896 struct nfs_fh *mntfh = ctx->mntfh;
897 struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
898 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
899
900 if (data == NULL)
901 goto out_no_data;
902
903 ctx->version = NFS_DEFAULT_VERSION;
904 switch (data->version) {
905 case 1:
906 data->namlen = 0;
907 fallthrough;
908 case 2:
909 data->bsize = 0;
910 fallthrough;
911 case 3:
912 if (data->flags & NFS_MOUNT_VER3)
913 goto out_no_v3;
914 data->root.size = NFS2_FHSIZE;
915 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
916 /* Turn off security negotiation */
917 extra_flags |= NFS_MOUNT_SECFLAVOUR;
918 fallthrough;
919 case 4:
920 if (data->flags & NFS_MOUNT_SECFLAVOUR)
921 goto out_no_sec;
922 fallthrough;
923 case 5:
924 memset(data->context, 0, sizeof(data->context));
925 fallthrough;
926 case 6:
927 if (data->flags & NFS_MOUNT_VER3) {
928 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
929 goto out_invalid_fh;
930 mntfh->size = data->root.size;
931 ctx->version = 3;
932 } else {
933 mntfh->size = NFS2_FHSIZE;
934 ctx->version = 2;
935 }
936
937
938 memcpy(mntfh->data, data->root.data, mntfh->size);
939 if (mntfh->size < sizeof(mntfh->data))
940 memset(mntfh->data + mntfh->size, 0,
941 sizeof(mntfh->data) - mntfh->size);
942
943 /*
944 * Translate to nfs_fs_context, which nfs_fill_super
945 * can deal with.
946 */
947 ctx->flags = data->flags & NFS_MOUNT_FLAGMASK;
948 ctx->flags |= extra_flags;
949 ctx->rsize = data->rsize;
950 ctx->wsize = data->wsize;
951 ctx->timeo = data->timeo;
952 ctx->retrans = data->retrans;
953 ctx->acregmin = data->acregmin;
954 ctx->acregmax = data->acregmax;
955 ctx->acdirmin = data->acdirmin;
956 ctx->acdirmax = data->acdirmax;
957 ctx->need_mount = false;
958
959 memcpy(sap, &data->addr, sizeof(data->addr));
960 ctx->nfs_server.addrlen = sizeof(data->addr);
961 ctx->nfs_server.port = ntohs(data->addr.sin_port);
962 if (sap->sa_family != AF_INET ||
963 !nfs_verify_server_address(sap))
964 goto out_no_address;
965
966 if (!(data->flags & NFS_MOUNT_TCP))
967 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
968 /* N.B. caller will free nfs_server.hostname in all cases */
969 ctx->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
970 if (!ctx->nfs_server.hostname)
971 goto out_nomem;
972
973 ctx->namlen = data->namlen;
974 ctx->bsize = data->bsize;
975
976 if (data->flags & NFS_MOUNT_SECFLAVOUR)
977 ctx->selected_flavor = data->pseudoflavor;
978 else
979 ctx->selected_flavor = RPC_AUTH_UNIX;
980
981 if (!(data->flags & NFS_MOUNT_NONLM))
982 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
983 NFS_MOUNT_LOCAL_FCNTL);
984 else
985 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK|
986 NFS_MOUNT_LOCAL_FCNTL);
987
988 /*
989 * The legacy version 6 binary mount data from userspace has a
990 * field used only to transport selinux information into the
991 * kernel. To continue to support that functionality we
992 * have a touch of selinux knowledge here in the NFS code. The
993 * userspace code converted context=blah to just blah so we are
994 * converting back to the full string selinux understands.
995 */
996 if (data->context[0]){
997 #ifdef CONFIG_SECURITY_SELINUX
998 int ret;
999
1000 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1001 ret = vfs_parse_fs_string(fc, "context",
1002 data->context, strlen(data->context));
1003 if (ret < 0)
1004 return ret;
1005 #else
1006 return -EINVAL;
1007 #endif
1008 }
1009
1010 break;
1011 default:
1012 goto generic;
1013 }
1014
1015 ctx->skip_reconfig_option_check = true;
1016 return 0;
1017
1018 generic:
1019 return generic_parse_monolithic(fc, data);
1020
1021 out_no_data:
1022 if (is_remount_fc(fc)) {
1023 ctx->skip_reconfig_option_check = true;
1024 return 0;
1025 }
1026 return nfs_invalf(fc, "NFS: mount program didn't pass any mount data");
1027
1028 out_no_v3:
1029 return nfs_invalf(fc, "NFS: nfs_mount_data version does not support v3");
1030
1031 out_no_sec:
1032 return nfs_invalf(fc, "NFS: nfs_mount_data version supports only AUTH_SYS");
1033
1034 out_nomem:
1035 dfprintk(MOUNT, "NFS: not enough memory to handle mount options");
1036 return -ENOMEM;
1037
1038 out_no_address:
1039 return nfs_invalf(fc, "NFS: mount program didn't pass remote address");
1040
1041 out_invalid_fh:
1042 return nfs_invalf(fc, "NFS: invalid root filehandle");
1043 }
1044
1045 #if IS_ENABLED(CONFIG_NFS_V4)
1046 struct compat_nfs_string {
1047 compat_uint_t len;
1048 compat_uptr_t data;
1049 };
1050
1051 static inline void compat_nfs_string(struct nfs_string *dst,
1052 struct compat_nfs_string *src)
1053 {
1054 dst->data = compat_ptr(src->data);
1055 dst->len = src->len;
1056 }
1057
1058 struct compat_nfs4_mount_data_v1 {
1059 compat_int_t version;
1060 compat_int_t flags;
1061 compat_int_t rsize;
1062 compat_int_t wsize;
1063 compat_int_t timeo;
1064 compat_int_t retrans;
1065 compat_int_t acregmin;
1066 compat_int_t acregmax;
1067 compat_int_t acdirmin;
1068 compat_int_t acdirmax;
1069 struct compat_nfs_string client_addr;
1070 struct compat_nfs_string mnt_path;
1071 struct compat_nfs_string hostname;
1072 compat_uint_t host_addrlen;
1073 compat_uptr_t host_addr;
1074 compat_int_t proto;
1075 compat_int_t auth_flavourlen;
1076 compat_uptr_t auth_flavours;
1077 };
1078
1079 static void nfs4_compat_mount_data_conv(struct nfs4_mount_data *data)
1080 {
1081 struct compat_nfs4_mount_data_v1 *compat =
1082 (struct compat_nfs4_mount_data_v1 *)data;
1083
1084 /* copy the fields backwards */
1085 data->auth_flavours = compat_ptr(compat->auth_flavours);
1086 data->auth_flavourlen = compat->auth_flavourlen;
1087 data->proto = compat->proto;
1088 data->host_addr = compat_ptr(compat->host_addr);
1089 data->host_addrlen = compat->host_addrlen;
1090 compat_nfs_string(&data->hostname, &compat->hostname);
1091 compat_nfs_string(&data->mnt_path, &compat->mnt_path);
1092 compat_nfs_string(&data->client_addr, &compat->client_addr);
1093 data->acdirmax = compat->acdirmax;
1094 data->acdirmin = compat->acdirmin;
1095 data->acregmax = compat->acregmax;
1096 data->acregmin = compat->acregmin;
1097 data->retrans = compat->retrans;
1098 data->timeo = compat->timeo;
1099 data->wsize = compat->wsize;
1100 data->rsize = compat->rsize;
1101 data->flags = compat->flags;
1102 data->version = compat->version;
1103 }
1104
1105 /*
1106 * Validate NFSv4 mount options
1107 */
1108 static int nfs4_parse_monolithic(struct fs_context *fc,
1109 struct nfs4_mount_data *data)
1110 {
1111 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1112 struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
1113 char *c;
1114
1115 if (!data) {
1116 if (is_remount_fc(fc))
1117 goto done;
1118 return nfs_invalf(fc,
1119 "NFS4: mount program didn't pass any mount data");
1120 }
1121
1122 ctx->version = 4;
1123
1124 if (data->version != 1)
1125 return generic_parse_monolithic(fc, data);
1126
1127 if (in_compat_syscall())
1128 nfs4_compat_mount_data_conv(data);
1129
1130 if (data->host_addrlen > sizeof(ctx->nfs_server.address))
1131 goto out_no_address;
1132 if (data->host_addrlen == 0)
1133 goto out_no_address;
1134 ctx->nfs_server.addrlen = data->host_addrlen;
1135 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
1136 return -EFAULT;
1137 if (!nfs_verify_server_address(sap))
1138 goto out_no_address;
1139 ctx->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
1140
1141 if (data->auth_flavourlen) {
1142 rpc_authflavor_t pseudoflavor;
1143
1144 if (data->auth_flavourlen > 1)
1145 goto out_inval_auth;
1146 if (copy_from_user(&pseudoflavor, data->auth_flavours,
1147 sizeof(pseudoflavor)))
1148 return -EFAULT;
1149 ctx->selected_flavor = pseudoflavor;
1150 } else {
1151 ctx->selected_flavor = RPC_AUTH_UNIX;
1152 }
1153
1154 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1155 if (IS_ERR(c))
1156 return PTR_ERR(c);
1157 ctx->nfs_server.hostname = c;
1158
1159 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1160 if (IS_ERR(c))
1161 return PTR_ERR(c);
1162 ctx->nfs_server.export_path = c;
1163 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1164
1165 c = strndup_user(data->client_addr.data, 16);
1166 if (IS_ERR(c))
1167 return PTR_ERR(c);
1168 ctx->client_address = c;
1169
1170 /*
1171 * Translate to nfs_fs_context, which nfs_fill_super
1172 * can deal with.
1173 */
1174
1175 ctx->flags = data->flags & NFS4_MOUNT_FLAGMASK;
1176 ctx->rsize = data->rsize;
1177 ctx->wsize = data->wsize;
1178 ctx->timeo = data->timeo;
1179 ctx->retrans = data->retrans;
1180 ctx->acregmin = data->acregmin;
1181 ctx->acregmax = data->acregmax;
1182 ctx->acdirmin = data->acdirmin;
1183 ctx->acdirmax = data->acdirmax;
1184 ctx->nfs_server.protocol = data->proto;
1185 nfs_validate_transport_protocol(ctx);
1186 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
1187 goto out_invalid_transport_udp;
1188 done:
1189 ctx->skip_reconfig_option_check = true;
1190 return 0;
1191
1192 out_inval_auth:
1193 return nfs_invalf(fc, "NFS4: Invalid number of RPC auth flavours %d",
1194 data->auth_flavourlen);
1195
1196 out_no_address:
1197 return nfs_invalf(fc, "NFS4: mount program didn't pass remote address");
1198
1199 out_invalid_transport_udp:
1200 return nfs_invalf(fc, "NFS: Unsupported transport protocol udp");
1201 }
1202 #endif
1203
1204 /*
1205 * Parse a monolithic block of data from sys_mount().
1206 */
1207 static int nfs_fs_context_parse_monolithic(struct fs_context *fc,
1208 void *data)
1209 {
1210 if (fc->fs_type == &nfs_fs_type)
1211 return nfs23_parse_monolithic(fc, data);
1212
1213 #if IS_ENABLED(CONFIG_NFS_V4)
1214 if (fc->fs_type == &nfs4_fs_type)
1215 return nfs4_parse_monolithic(fc, data);
1216 #endif
1217
1218 return nfs_invalf(fc, "NFS: Unsupported monolithic data version");
1219 }
1220
1221 /*
1222 * Validate the preparsed information in the config.
1223 */
1224 static int nfs_fs_context_validate(struct fs_context *fc)
1225 {
1226 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1227 struct nfs_subversion *nfs_mod;
1228 struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
1229 int max_namelen = PAGE_SIZE;
1230 int max_pathlen = NFS_MAXPATHLEN;
1231 int port = 0;
1232 int ret;
1233
1234 if (!fc->source)
1235 goto out_no_device_name;
1236
1237 /* Check for sanity first. */
1238 if (ctx->minorversion && ctx->version != 4)
1239 goto out_minorversion_mismatch;
1240
1241 if (ctx->options & NFS_OPTION_MIGRATION &&
1242 (ctx->version != 4 || ctx->minorversion != 0))
1243 goto out_migration_misuse;
1244
1245 /* Verify that any proto=/mountproto= options match the address
1246 * families in the addr=/mountaddr= options.
1247 */
1248 if (ctx->protofamily != AF_UNSPEC &&
1249 ctx->protofamily != ctx->nfs_server.address.sa_family)
1250 goto out_proto_mismatch;
1251
1252 if (ctx->mountfamily != AF_UNSPEC) {
1253 if (ctx->mount_server.addrlen) {
1254 if (ctx->mountfamily != ctx->mount_server.address.sa_family)
1255 goto out_mountproto_mismatch;
1256 } else {
1257 if (ctx->mountfamily != ctx->nfs_server.address.sa_family)
1258 goto out_mountproto_mismatch;
1259 }
1260 }
1261
1262 if (!nfs_verify_server_address(sap))
1263 goto out_no_address;
1264
1265 if (ctx->version == 4) {
1266 if (IS_ENABLED(CONFIG_NFS_V4)) {
1267 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
1268 port = NFS_RDMA_PORT;
1269 else
1270 port = NFS_PORT;
1271 max_namelen = NFS4_MAXNAMLEN;
1272 max_pathlen = NFS4_MAXPATHLEN;
1273 nfs_validate_transport_protocol(ctx);
1274 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
1275 goto out_invalid_transport_udp;
1276 ctx->flags &= ~(NFS_MOUNT_NONLM | NFS_MOUNT_NOACL |
1277 NFS_MOUNT_VER3 | NFS_MOUNT_LOCAL_FLOCK |
1278 NFS_MOUNT_LOCAL_FCNTL);
1279 } else {
1280 goto out_v4_not_compiled;
1281 }
1282 } else {
1283 nfs_set_mount_transport_protocol(ctx);
1284 #ifdef CONFIG_NFS_DISABLE_UDP_SUPPORT
1285 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
1286 goto out_invalid_transport_udp;
1287 #endif
1288 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
1289 port = NFS_RDMA_PORT;
1290 }
1291
1292 nfs_set_port(sap, &ctx->nfs_server.port, port);
1293
1294 ret = nfs_parse_source(fc, max_namelen, max_pathlen);
1295 if (ret < 0)
1296 return ret;
1297
1298 /* Load the NFS protocol module if we haven't done so yet */
1299 if (!ctx->nfs_mod) {
1300 nfs_mod = get_nfs_version(ctx->version);
1301 if (IS_ERR(nfs_mod)) {
1302 ret = PTR_ERR(nfs_mod);
1303 goto out_version_unavailable;
1304 }
1305 ctx->nfs_mod = nfs_mod;
1306 }
1307
1308 /* Ensure the filesystem context has the correct fs_type */
1309 if (fc->fs_type != ctx->nfs_mod->nfs_fs) {
1310 module_put(fc->fs_type->owner);
1311 __module_get(ctx->nfs_mod->nfs_fs->owner);
1312 fc->fs_type = ctx->nfs_mod->nfs_fs;
1313 }
1314 return 0;
1315
1316 out_no_device_name:
1317 return nfs_invalf(fc, "NFS: Device name not specified");
1318 out_v4_not_compiled:
1319 nfs_errorf(fc, "NFS: NFSv4 is not compiled into kernel");
1320 return -EPROTONOSUPPORT;
1321 out_invalid_transport_udp:
1322 return nfs_invalf(fc, "NFS: Unsupported transport protocol udp");
1323 out_no_address:
1324 return nfs_invalf(fc, "NFS: mount program didn't pass remote address");
1325 out_mountproto_mismatch:
1326 return nfs_invalf(fc, "NFS: Mount server address does not match mountproto= option");
1327 out_proto_mismatch:
1328 return nfs_invalf(fc, "NFS: Server address does not match proto= option");
1329 out_minorversion_mismatch:
1330 return nfs_invalf(fc, "NFS: Mount option vers=%u does not support minorversion=%u",
1331 ctx->version, ctx->minorversion);
1332 out_migration_misuse:
1333 return nfs_invalf(fc, "NFS: 'Migration' not supported for this NFS version");
1334 out_version_unavailable:
1335 nfs_errorf(fc, "NFS: Version unavailable");
1336 return ret;
1337 }
1338
1339 /*
1340 * Create an NFS superblock by the appropriate method.
1341 */
1342 static int nfs_get_tree(struct fs_context *fc)
1343 {
1344 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1345 int err = nfs_fs_context_validate(fc);
1346
1347 if (err)
1348 return err;
1349 if (!ctx->internal)
1350 return ctx->nfs_mod->rpc_ops->try_get_tree(fc);
1351 else
1352 return nfs_get_tree_common(fc);
1353 }
1354
1355 /*
1356 * Handle duplication of a configuration. The caller copied *src into *sc, but
1357 * it can't deal with resource pointers in the filesystem context, so we have
1358 * to do that. We need to clear pointers, copy data or get extra refs as
1359 * appropriate.
1360 */
1361 static int nfs_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)
1362 {
1363 struct nfs_fs_context *src = nfs_fc2context(src_fc), *ctx;
1364
1365 ctx = kmemdup(src, sizeof(struct nfs_fs_context), GFP_KERNEL);
1366 if (!ctx)
1367 return -ENOMEM;
1368
1369 ctx->mntfh = nfs_alloc_fhandle();
1370 if (!ctx->mntfh) {
1371 kfree(ctx);
1372 return -ENOMEM;
1373 }
1374 nfs_copy_fh(ctx->mntfh, src->mntfh);
1375
1376 __module_get(ctx->nfs_mod->owner);
1377 ctx->client_address = NULL;
1378 ctx->mount_server.hostname = NULL;
1379 ctx->nfs_server.export_path = NULL;
1380 ctx->nfs_server.hostname = NULL;
1381 ctx->fscache_uniq = NULL;
1382 ctx->clone_data.fattr = NULL;
1383 fc->fs_private = ctx;
1384 return 0;
1385 }
1386
1387 static void nfs_fs_context_free(struct fs_context *fc)
1388 {
1389 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1390
1391 if (ctx) {
1392 if (ctx->server)
1393 nfs_free_server(ctx->server);
1394 if (ctx->nfs_mod)
1395 put_nfs_version(ctx->nfs_mod);
1396 kfree(ctx->client_address);
1397 kfree(ctx->mount_server.hostname);
1398 kfree(ctx->nfs_server.export_path);
1399 kfree(ctx->nfs_server.hostname);
1400 kfree(ctx->fscache_uniq);
1401 nfs_free_fhandle(ctx->mntfh);
1402 nfs_free_fattr(ctx->clone_data.fattr);
1403 kfree(ctx);
1404 }
1405 }
1406
1407 static const struct fs_context_operations nfs_fs_context_ops = {
1408 .free = nfs_fs_context_free,
1409 .dup = nfs_fs_context_dup,
1410 .parse_param = nfs_fs_context_parse_param,
1411 .parse_monolithic = nfs_fs_context_parse_monolithic,
1412 .get_tree = nfs_get_tree,
1413 .reconfigure = nfs_reconfigure,
1414 };
1415
1416 /*
1417 * Prepare superblock configuration. We use the namespaces attached to the
1418 * context. This may be the current process's namespaces, or it may be a
1419 * container's namespaces.
1420 */
1421 static int nfs_init_fs_context(struct fs_context *fc)
1422 {
1423 struct nfs_fs_context *ctx;
1424
1425 ctx = kzalloc(sizeof(struct nfs_fs_context), GFP_KERNEL);
1426 if (unlikely(!ctx))
1427 return -ENOMEM;
1428
1429 ctx->mntfh = nfs_alloc_fhandle();
1430 if (unlikely(!ctx->mntfh)) {
1431 kfree(ctx);
1432 return -ENOMEM;
1433 }
1434
1435 ctx->protofamily = AF_UNSPEC;
1436 ctx->mountfamily = AF_UNSPEC;
1437 ctx->mount_server.port = NFS_UNSPEC_PORT;
1438
1439 if (fc->root) {
1440 /* reconfigure, start with the current config */
1441 struct nfs_server *nfss = fc->root->d_sb->s_fs_info;
1442 struct net *net = nfss->nfs_client->cl_net;
1443
1444 ctx->flags = nfss->flags;
1445 ctx->rsize = nfss->rsize;
1446 ctx->wsize = nfss->wsize;
1447 ctx->retrans = nfss->client->cl_timeout->to_retries;
1448 ctx->selected_flavor = nfss->client->cl_auth->au_flavor;
1449 ctx->acregmin = nfss->acregmin / HZ;
1450 ctx->acregmax = nfss->acregmax / HZ;
1451 ctx->acdirmin = nfss->acdirmin / HZ;
1452 ctx->acdirmax = nfss->acdirmax / HZ;
1453 ctx->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1454 ctx->nfs_server.port = nfss->port;
1455 ctx->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1456 ctx->version = nfss->nfs_client->rpc_ops->version;
1457 ctx->minorversion = nfss->nfs_client->cl_minorversion;
1458
1459 memcpy(&ctx->nfs_server.address, &nfss->nfs_client->cl_addr,
1460 ctx->nfs_server.addrlen);
1461
1462 if (fc->net_ns != net) {
1463 put_net(fc->net_ns);
1464 fc->net_ns = get_net(net);
1465 }
1466
1467 ctx->nfs_mod = nfss->nfs_client->cl_nfs_mod;
1468 __module_get(ctx->nfs_mod->owner);
1469 } else {
1470 /* defaults */
1471 ctx->timeo = NFS_UNSPEC_TIMEO;
1472 ctx->retrans = NFS_UNSPEC_RETRANS;
1473 ctx->acregmin = NFS_DEF_ACREGMIN;
1474 ctx->acregmax = NFS_DEF_ACREGMAX;
1475 ctx->acdirmin = NFS_DEF_ACDIRMIN;
1476 ctx->acdirmax = NFS_DEF_ACDIRMAX;
1477 ctx->nfs_server.port = NFS_UNSPEC_PORT;
1478 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1479 ctx->selected_flavor = RPC_AUTH_MAXFLAVOR;
1480 ctx->minorversion = 0;
1481 ctx->need_mount = true;
1482 }
1483 fc->fs_private = ctx;
1484 fc->ops = &nfs_fs_context_ops;
1485 return 0;
1486 }
1487
1488 struct file_system_type nfs_fs_type = {
1489 .owner = THIS_MODULE,
1490 .name = "nfs",
1491 .init_fs_context = nfs_init_fs_context,
1492 .parameters = nfs_fs_parameters,
1493 .kill_sb = nfs_kill_super,
1494 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
1495 };
1496 MODULE_ALIAS_FS("nfs");
1497 EXPORT_SYMBOL_GPL(nfs_fs_type);
1498
1499 #if IS_ENABLED(CONFIG_NFS_V4)
1500 struct file_system_type nfs4_fs_type = {
1501 .owner = THIS_MODULE,
1502 .name = "nfs4",
1503 .init_fs_context = nfs_init_fs_context,
1504 .parameters = nfs_fs_parameters,
1505 .kill_sb = nfs_kill_super,
1506 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
1507 };
1508 MODULE_ALIAS_FS("nfs4");
1509 MODULE_ALIAS("nfs4");
1510 EXPORT_SYMBOL_GPL(nfs4_fs_type);
1511 #endif /* CONFIG_NFS_V4 */
Linux with added FPC-III support