]> git.proxmox.com Git - mirror_ubuntu-hirsute-kernel.git/blob - fs/nfs/fs_context.c
projects / mirror_ubuntu-hirsute-kernel.git / blob
? search:


29ec8b09a52d8de4d8fcfffc127faa9ac7331f02
[mirror_ubuntu-hirsute-kernel.git] / fs / nfs / fs_context.c
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 ctx->flags |= NFS_MOUNT_TCP;
514 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
515 break;
516 case Opt_rdma:
517 ctx->flags |= NFS_MOUNT_TCP; /* for side protocols */
518 ctx->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
519 xprt_load_transport(param->key);
520 break;
521 case Opt_acl:
522 if (result.negated)
523 ctx->flags |= NFS_MOUNT_NOACL;
524 else
525 ctx->flags &= ~NFS_MOUNT_NOACL;
526 break;
527 case Opt_rdirplus:
528 if (result.negated)
529 ctx->flags |= NFS_MOUNT_NORDIRPLUS;
530 else
531 ctx->flags &= ~NFS_MOUNT_NORDIRPLUS;
532 break;
533 case Opt_sharecache:
534 if (result.negated)
535 ctx->flags |= NFS_MOUNT_UNSHARED;
536 else
537 ctx->flags &= ~NFS_MOUNT_UNSHARED;
538 break;
539 case Opt_resvport:
540 if (result.negated)
541 ctx->flags |= NFS_MOUNT_NORESVPORT;
542 else
543 ctx->flags &= ~NFS_MOUNT_NORESVPORT;
544 break;
545 case Opt_fscache_flag:
546 if (result.negated)
547 ctx->options &= ~NFS_OPTION_FSCACHE;
548 else
549 ctx->options |= NFS_OPTION_FSCACHE;
550 kfree(ctx->fscache_uniq);
551 ctx->fscache_uniq = NULL;
552 break;
553 case Opt_fscache:
554 ctx->options |= NFS_OPTION_FSCACHE;
555 kfree(ctx->fscache_uniq);
556 ctx->fscache_uniq = param->string;
557 param->string = NULL;
558 break;
559 case Opt_migration:
560 if (result.negated)
561 ctx->options &= ~NFS_OPTION_MIGRATION;
562 else
563 ctx->options |= NFS_OPTION_MIGRATION;
564 break;
565
566 /*
567 * options that take numeric values
568 */
569 case Opt_port:
570 if (result.uint_32 > USHRT_MAX)
571 goto out_of_bounds;
572 ctx->nfs_server.port = result.uint_32;
573 break;
574 case Opt_rsize:
575 ctx->rsize = result.uint_32;
576 break;
577 case Opt_wsize:
578 ctx->wsize = result.uint_32;
579 break;
580 case Opt_bsize:
581 ctx->bsize = result.uint_32;
582 break;
583 case Opt_timeo:
584 if (result.uint_32 < 1 || result.uint_32 > INT_MAX)
585 goto out_of_bounds;
586 ctx->timeo = result.uint_32;
587 break;
588 case Opt_retrans:
589 if (result.uint_32 > INT_MAX)
590 goto out_of_bounds;
591 ctx->retrans = result.uint_32;
592 break;
593 case Opt_acregmin:
594 ctx->acregmin = result.uint_32;
595 break;
596 case Opt_acregmax:
597 ctx->acregmax = result.uint_32;
598 break;
599 case Opt_acdirmin:
600 ctx->acdirmin = result.uint_32;
601 break;
602 case Opt_acdirmax:
603 ctx->acdirmax = result.uint_32;
604 break;
605 case Opt_actimeo:
606 ctx->acregmin = result.uint_32;
607 ctx->acregmax = result.uint_32;
608 ctx->acdirmin = result.uint_32;
609 ctx->acdirmax = result.uint_32;
610 break;
611 case Opt_namelen:
612 ctx->namlen = result.uint_32;
613 break;
614 case Opt_mountport:
615 if (result.uint_32 > USHRT_MAX)
616 goto out_of_bounds;
617 ctx->mount_server.port = result.uint_32;
618 break;
619 case Opt_mountvers:
620 if (result.uint_32 < NFS_MNT_VERSION ||
621 result.uint_32 > NFS_MNT3_VERSION)
622 goto out_of_bounds;
623 ctx->mount_server.version = result.uint_32;
624 break;
625 case Opt_minorversion:
626 if (result.uint_32 > NFS4_MAX_MINOR_VERSION)
627 goto out_of_bounds;
628 ctx->minorversion = result.uint_32;
629 break;
630
631 /*
632 * options that take text values
633 */
634 case Opt_v:
635 ret = nfs_parse_version_string(fc, param->key + 1);
636 if (ret < 0)
637 return ret;
638 break;
639 case Opt_vers:
640 ret = nfs_parse_version_string(fc, param->string);
641 if (ret < 0)
642 return ret;
643 break;
644 case Opt_sec:
645 ret = nfs_parse_security_flavors(fc, param);
646 if (ret < 0)
647 return ret;
648 break;
649
650 case Opt_proto:
651 protofamily = AF_INET;
652 switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
653 case Opt_xprt_udp6:
654 protofamily = AF_INET6;
655 fallthrough;
656 case Opt_xprt_udp:
657 ctx->flags &= ~NFS_MOUNT_TCP;
658 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
659 break;
660 case Opt_xprt_tcp6:
661 protofamily = AF_INET6;
662 fallthrough;
663 case Opt_xprt_tcp:
664 ctx->flags |= NFS_MOUNT_TCP;
665 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
666 break;
667 case Opt_xprt_rdma6:
668 protofamily = AF_INET6;
669 fallthrough;
670 case Opt_xprt_rdma:
671 /* vector side protocols to TCP */
672 ctx->flags |= NFS_MOUNT_TCP;
673 ctx->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
674 xprt_load_transport(param->string);
675 break;
676 default:
677 return nfs_invalf(fc, "NFS: Unrecognized transport protocol");
678 }
679
680 ctx->protofamily = protofamily;
681 break;
682
683 case Opt_mountproto:
684 mountfamily = AF_INET;
685 switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
686 case Opt_xprt_udp6:
687 mountfamily = AF_INET6;
688 fallthrough;
689 case Opt_xprt_udp:
690 ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
691 break;
692 case Opt_xprt_tcp6:
693 mountfamily = AF_INET6;
694 fallthrough;
695 case Opt_xprt_tcp:
696 ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
697 break;
698 case Opt_xprt_rdma: /* not used for side protocols */
699 default:
700 return nfs_invalf(fc, "NFS: Unrecognized transport protocol");
701 }
702 ctx->mountfamily = mountfamily;
703 break;
704
705 case Opt_addr:
706 len = rpc_pton(fc->net_ns, param->string, param->size,
707 &ctx->nfs_server.address,
708 sizeof(ctx->nfs_server._address));
709 if (len == 0)
710 goto out_invalid_address;
711 ctx->nfs_server.addrlen = len;
712 break;
713 case Opt_clientaddr:
714 kfree(ctx->client_address);
715 ctx->client_address = param->string;
716 param->string = NULL;
717 break;
718 case Opt_mounthost:
719 kfree(ctx->mount_server.hostname);
720 ctx->mount_server.hostname = param->string;
721 param->string = NULL;
722 break;
723 case Opt_mountaddr:
724 len = rpc_pton(fc->net_ns, param->string, param->size,
725 &ctx->mount_server.address,
726 sizeof(ctx->mount_server._address));
727 if (len == 0)
728 goto out_invalid_address;
729 ctx->mount_server.addrlen = len;
730 break;
731 case Opt_nconnect:
732 if (result.uint_32 < 1 || result.uint_32 > NFS_MAX_CONNECTIONS)
733 goto out_of_bounds;
734 ctx->nfs_server.nconnect = result.uint_32;
735 break;
736 case Opt_lookupcache:
737 switch (result.uint_32) {
738 case Opt_lookupcache_all:
739 ctx->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
740 break;
741 case Opt_lookupcache_positive:
742 ctx->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
743 ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
744 break;
745 case Opt_lookupcache_none:
746 ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
747 break;
748 default:
749 goto out_invalid_value;
750 }
751 break;
752 case Opt_local_lock:
753 switch (result.uint_32) {
754 case Opt_local_lock_all:
755 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK |
756 NFS_MOUNT_LOCAL_FCNTL);
757 break;
758 case Opt_local_lock_flock:
759 ctx->flags |= NFS_MOUNT_LOCAL_FLOCK;
760 break;
761 case Opt_local_lock_posix:
762 ctx->flags |= NFS_MOUNT_LOCAL_FCNTL;
763 break;
764 case Opt_local_lock_none:
765 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
766 NFS_MOUNT_LOCAL_FCNTL);
767 break;
768 default:
769 goto out_invalid_value;
770 }
771 break;
772
773 /*
774 * Special options
775 */
776 case Opt_sloppy:
777 ctx->sloppy = true;
778 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
779 break;
780 }
781
782 return 0;
783
784 out_invalid_value:
785 return nfs_invalf(fc, "NFS: Bad mount option value specified");
786 out_invalid_address:
787 return nfs_invalf(fc, "NFS: Bad IP address specified");
788 out_of_bounds:
789 return nfs_invalf(fc, "NFS: Value for '%s' out of range", param->key);
790 }
791
792 /*
793 * Split fc->source into "hostname:export_path".
794 *
795 * The leftmost colon demarks the split between the server's hostname
796 * and the export path. If the hostname starts with a left square
797 * bracket, then it may contain colons.
798 *
799 * Note: caller frees hostname and export path, even on error.
800 */
801 static int nfs_parse_source(struct fs_context *fc,
802 size_t maxnamlen, size_t maxpathlen)
803 {
804 struct nfs_fs_context *ctx = nfs_fc2context(fc);
805 const char *dev_name = fc->source;
806 size_t len;
807 const char *end;
808
809 if (unlikely(!dev_name || !*dev_name)) {
810 dfprintk(MOUNT, "NFS: device name not specified\n");
811 return -EINVAL;
812 }
813
814 /* Is the host name protected with square brakcets? */
815 if (*dev_name == '[') {
816 end = strchr(++dev_name, ']');
817 if (end == NULL || end[1] != ':')
818 goto out_bad_devname;
819
820 len = end - dev_name;
821 end++;
822 } else {
823 const char *comma;
824
825 end = strchr(dev_name, ':');
826 if (end == NULL)
827 goto out_bad_devname;
828 len = end - dev_name;
829
830 /* kill possible hostname list: not supported */
831 comma = memchr(dev_name, ',', len);
832 if (comma)
833 len = comma - dev_name;
834 }
835
836 if (len > maxnamlen)
837 goto out_hostname;
838
839 kfree(ctx->nfs_server.hostname);
840
841 /* N.B. caller will free nfs_server.hostname in all cases */
842 ctx->nfs_server.hostname = kmemdup_nul(dev_name, len, GFP_KERNEL);
843 if (!ctx->nfs_server.hostname)
844 goto out_nomem;
845 len = strlen(++end);
846 if (len > maxpathlen)
847 goto out_path;
848 ctx->nfs_server.export_path = kmemdup_nul(end, len, GFP_KERNEL);
849 if (!ctx->nfs_server.export_path)
850 goto out_nomem;
851
852 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", ctx->nfs_server.export_path);
853 return 0;
854
855 out_bad_devname:
856 return nfs_invalf(fc, "NFS: device name not in host:path format");
857 out_nomem:
858 nfs_errorf(fc, "NFS: not enough memory to parse device name");
859 return -ENOMEM;
860 out_hostname:
861 nfs_errorf(fc, "NFS: server hostname too long");
862 return -ENAMETOOLONG;
863 out_path:
864 nfs_errorf(fc, "NFS: export pathname too long");
865 return -ENAMETOOLONG;
866 }
867
868 static inline bool is_remount_fc(struct fs_context *fc)
869 {
870 return fc->root != NULL;
871 }
872
873 /*
874 * Parse monolithic NFS2/NFS3 mount data
875 * - fills in the mount root filehandle
876 *
877 * For option strings, user space handles the following behaviors:
878 *
879 * + DNS: mapping server host name to IP address ("addr=" option)
880 *
881 * + failure mode: how to behave if a mount request can't be handled
882 * immediately ("fg/bg" option)
883 *
884 * + retry: how often to retry a mount request ("retry=" option)
885 *
886 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
887 * mountproto=tcp after mountproto=udp, and so on
888 */
889 static int nfs23_parse_monolithic(struct fs_context *fc,
890 struct nfs_mount_data *data)
891 {
892 struct nfs_fs_context *ctx = nfs_fc2context(fc);
893 struct nfs_fh *mntfh = ctx->mntfh;
894 struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
895 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
896
897 if (data == NULL)
898 goto out_no_data;
899
900 ctx->version = NFS_DEFAULT_VERSION;
901 switch (data->version) {
902 case 1:
903 data->namlen = 0;
904 fallthrough;
905 case 2:
906 data->bsize = 0;
907 fallthrough;
908 case 3:
909 if (data->flags & NFS_MOUNT_VER3)
910 goto out_no_v3;
911 data->root.size = NFS2_FHSIZE;
912 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
913 /* Turn off security negotiation */
914 extra_flags |= NFS_MOUNT_SECFLAVOUR;
915 fallthrough;
916 case 4:
917 if (data->flags & NFS_MOUNT_SECFLAVOUR)
918 goto out_no_sec;
919 fallthrough;
920 case 5:
921 memset(data->context, 0, sizeof(data->context));
922 fallthrough;
923 case 6:
924 if (data->flags & NFS_MOUNT_VER3) {
925 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
926 goto out_invalid_fh;
927 mntfh->size = data->root.size;
928 ctx->version = 3;
929 } else {
930 mntfh->size = NFS2_FHSIZE;
931 ctx->version = 2;
932 }
933
934
935 memcpy(mntfh->data, data->root.data, mntfh->size);
936 if (mntfh->size < sizeof(mntfh->data))
937 memset(mntfh->data + mntfh->size, 0,
938 sizeof(mntfh->data) - mntfh->size);
939
940 /*
941 * Translate to nfs_fs_context, which nfs_fill_super
942 * can deal with.
943 */
944 ctx->flags = data->flags & NFS_MOUNT_FLAGMASK;
945 ctx->flags |= extra_flags;
946 ctx->rsize = data->rsize;
947 ctx->wsize = data->wsize;
948 ctx->timeo = data->timeo;
949 ctx->retrans = data->retrans;
950 ctx->acregmin = data->acregmin;
951 ctx->acregmax = data->acregmax;
952 ctx->acdirmin = data->acdirmin;
953 ctx->acdirmax = data->acdirmax;
954 ctx->need_mount = false;
955
956 memcpy(sap, &data->addr, sizeof(data->addr));
957 ctx->nfs_server.addrlen = sizeof(data->addr);
958 ctx->nfs_server.port = ntohs(data->addr.sin_port);
959 if (sap->sa_family != AF_INET ||
960 !nfs_verify_server_address(sap))
961 goto out_no_address;
962
963 if (!(data->flags & NFS_MOUNT_TCP))
964 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
965 /* N.B. caller will free nfs_server.hostname in all cases */
966 ctx->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
967 if (!ctx->nfs_server.hostname)
968 goto out_nomem;
969
970 ctx->namlen = data->namlen;
971 ctx->bsize = data->bsize;
972
973 if (data->flags & NFS_MOUNT_SECFLAVOUR)
974 ctx->selected_flavor = data->pseudoflavor;
975 else
976 ctx->selected_flavor = RPC_AUTH_UNIX;
977
978 if (!(data->flags & NFS_MOUNT_NONLM))
979 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
980 NFS_MOUNT_LOCAL_FCNTL);
981 else
982 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK|
983 NFS_MOUNT_LOCAL_FCNTL);
984
985 /*
986 * The legacy version 6 binary mount data from userspace has a
987 * field used only to transport selinux information into the
988 * kernel. To continue to support that functionality we
989 * have a touch of selinux knowledge here in the NFS code. The
990 * userspace code converted context=blah to just blah so we are
991 * converting back to the full string selinux understands.
992 */
993 if (data->context[0]){
994 #ifdef CONFIG_SECURITY_SELINUX
995 int ret;
996
997 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
998 ret = vfs_parse_fs_string(fc, "context",
999 data->context, strlen(data->context));
1000 if (ret < 0)
1001 return ret;
1002 #else
1003 return -EINVAL;
1004 #endif
1005 }
1006
1007 break;
1008 default:
1009 goto generic;
1010 }
1011
1012 ctx->skip_reconfig_option_check = true;
1013 return 0;
1014
1015 generic:
1016 return generic_parse_monolithic(fc, data);
1017
1018 out_no_data:
1019 if (is_remount_fc(fc)) {
1020 ctx->skip_reconfig_option_check = true;
1021 return 0;
1022 }
1023 return nfs_invalf(fc, "NFS: mount program didn't pass any mount data");
1024
1025 out_no_v3:
1026 return nfs_invalf(fc, "NFS: nfs_mount_data version does not support v3");
1027
1028 out_no_sec:
1029 return nfs_invalf(fc, "NFS: nfs_mount_data version supports only AUTH_SYS");
1030
1031 out_nomem:
1032 dfprintk(MOUNT, "NFS: not enough memory to handle mount options");
1033 return -ENOMEM;
1034
1035 out_no_address:
1036 return nfs_invalf(fc, "NFS: mount program didn't pass remote address");
1037
1038 out_invalid_fh:
1039 return nfs_invalf(fc, "NFS: invalid root filehandle");
1040 }
1041
1042 #if IS_ENABLED(CONFIG_NFS_V4)
1043 struct compat_nfs_string {
1044 compat_uint_t len;
1045 compat_uptr_t data;
1046 };
1047
1048 static inline void compat_nfs_string(struct nfs_string *dst,
1049 struct compat_nfs_string *src)
1050 {
1051 dst->data = compat_ptr(src->data);
1052 dst->len = src->len;
1053 }
1054
1055 struct compat_nfs4_mount_data_v1 {
1056 compat_int_t version;
1057 compat_int_t flags;
1058 compat_int_t rsize;
1059 compat_int_t wsize;
1060 compat_int_t timeo;
1061 compat_int_t retrans;
1062 compat_int_t acregmin;
1063 compat_int_t acregmax;
1064 compat_int_t acdirmin;
1065 compat_int_t acdirmax;
1066 struct compat_nfs_string client_addr;
1067 struct compat_nfs_string mnt_path;
1068 struct compat_nfs_string hostname;
1069 compat_uint_t host_addrlen;
1070 compat_uptr_t host_addr;
1071 compat_int_t proto;
1072 compat_int_t auth_flavourlen;
1073 compat_uptr_t auth_flavours;
1074 };
1075
1076 static void nfs4_compat_mount_data_conv(struct nfs4_mount_data *data)
1077 {
1078 struct compat_nfs4_mount_data_v1 *compat =
1079 (struct compat_nfs4_mount_data_v1 *)data;
1080
1081 /* copy the fields backwards */
1082 data->auth_flavours = compat_ptr(compat->auth_flavours);
1083 data->auth_flavourlen = compat->auth_flavourlen;
1084 data->proto = compat->proto;
1085 data->host_addr = compat_ptr(compat->host_addr);
1086 data->host_addrlen = compat->host_addrlen;
1087 compat_nfs_string(&data->hostname, &compat->hostname);
1088 compat_nfs_string(&data->mnt_path, &compat->mnt_path);
1089 compat_nfs_string(&data->client_addr, &compat->client_addr);
1090 data->acdirmax = compat->acdirmax;
1091 data->acdirmin = compat->acdirmin;
1092 data->acregmax = compat->acregmax;
1093 data->acregmin = compat->acregmin;
1094 data->retrans = compat->retrans;
1095 data->timeo = compat->timeo;
1096 data->wsize = compat->wsize;
1097 data->rsize = compat->rsize;
1098 data->flags = compat->flags;
1099 data->version = compat->version;
1100 }
1101
1102 /*
1103 * Validate NFSv4 mount options
1104 */
1105 static int nfs4_parse_monolithic(struct fs_context *fc,
1106 struct nfs4_mount_data *data)
1107 {
1108 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1109 struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
1110 char *c;
1111
1112 if (!data) {
1113 if (is_remount_fc(fc))
1114 goto done;
1115 return nfs_invalf(fc,
1116 "NFS4: mount program didn't pass any mount data");
1117 }
1118
1119 ctx->version = 4;
1120
1121 if (data->version != 1)
1122 return generic_parse_monolithic(fc, data);
1123
1124 if (in_compat_syscall())
1125 nfs4_compat_mount_data_conv(data);
1126
1127 if (data->host_addrlen > sizeof(ctx->nfs_server.address))
1128 goto out_no_address;
1129 if (data->host_addrlen == 0)
1130 goto out_no_address;
1131 ctx->nfs_server.addrlen = data->host_addrlen;
1132 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
1133 return -EFAULT;
1134 if (!nfs_verify_server_address(sap))
1135 goto out_no_address;
1136 ctx->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
1137
1138 if (data->auth_flavourlen) {
1139 rpc_authflavor_t pseudoflavor;
1140
1141 if (data->auth_flavourlen > 1)
1142 goto out_inval_auth;
1143 if (copy_from_user(&pseudoflavor, data->auth_flavours,
1144 sizeof(pseudoflavor)))
1145 return -EFAULT;
1146 ctx->selected_flavor = pseudoflavor;
1147 } else {
1148 ctx->selected_flavor = RPC_AUTH_UNIX;
1149 }
1150
1151 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1152 if (IS_ERR(c))
1153 return PTR_ERR(c);
1154 ctx->nfs_server.hostname = c;
1155
1156 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1157 if (IS_ERR(c))
1158 return PTR_ERR(c);
1159 ctx->nfs_server.export_path = c;
1160 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1161
1162 c = strndup_user(data->client_addr.data, 16);
1163 if (IS_ERR(c))
1164 return PTR_ERR(c);
1165 ctx->client_address = c;
1166
1167 /*
1168 * Translate to nfs_fs_context, which nfs_fill_super
1169 * can deal with.
1170 */
1171
1172 ctx->flags = data->flags & NFS4_MOUNT_FLAGMASK;
1173 ctx->rsize = data->rsize;
1174 ctx->wsize = data->wsize;
1175 ctx->timeo = data->timeo;
1176 ctx->retrans = data->retrans;
1177 ctx->acregmin = data->acregmin;
1178 ctx->acregmax = data->acregmax;
1179 ctx->acdirmin = data->acdirmin;
1180 ctx->acdirmax = data->acdirmax;
1181 ctx->nfs_server.protocol = data->proto;
1182 nfs_validate_transport_protocol(ctx);
1183 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
1184 goto out_invalid_transport_udp;
1185 done:
1186 ctx->skip_reconfig_option_check = true;
1187 return 0;
1188
1189 out_inval_auth:
1190 return nfs_invalf(fc, "NFS4: Invalid number of RPC auth flavours %d",
1191 data->auth_flavourlen);
1192
1193 out_no_address:
1194 return nfs_invalf(fc, "NFS4: mount program didn't pass remote address");
1195
1196 out_invalid_transport_udp:
1197 return nfs_invalf(fc, "NFS: Unsupported transport protocol udp");
1198 }
1199 #endif
1200
1201 /*
1202 * Parse a monolithic block of data from sys_mount().
1203 */
1204 static int nfs_fs_context_parse_monolithic(struct fs_context *fc,
1205 void *data)
1206 {
1207 if (fc->fs_type == &nfs_fs_type)
1208 return nfs23_parse_monolithic(fc, data);
1209
1210 #if IS_ENABLED(CONFIG_NFS_V4)
1211 if (fc->fs_type == &nfs4_fs_type)
1212 return nfs4_parse_monolithic(fc, data);
1213 #endif
1214
1215 return nfs_invalf(fc, "NFS: Unsupported monolithic data version");
1216 }
1217
1218 /*
1219 * Validate the preparsed information in the config.
1220 */
1221 static int nfs_fs_context_validate(struct fs_context *fc)
1222 {
1223 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1224 struct nfs_subversion *nfs_mod;
1225 struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
1226 int max_namelen = PAGE_SIZE;
1227 int max_pathlen = NFS_MAXPATHLEN;
1228 int port = 0;
1229 int ret;
1230
1231 if (!fc->source)
1232 goto out_no_device_name;
1233
1234 /* Check for sanity first. */
1235 if (ctx->minorversion && ctx->version != 4)
1236 goto out_minorversion_mismatch;
1237
1238 if (ctx->options & NFS_OPTION_MIGRATION &&
1239 (ctx->version != 4 || ctx->minorversion != 0))
1240 goto out_migration_misuse;
1241
1242 /* Verify that any proto=/mountproto= options match the address
1243 * families in the addr=/mountaddr= options.
1244 */
1245 if (ctx->protofamily != AF_UNSPEC &&
1246 ctx->protofamily != ctx->nfs_server.address.sa_family)
1247 goto out_proto_mismatch;
1248
1249 if (ctx->mountfamily != AF_UNSPEC) {
1250 if (ctx->mount_server.addrlen) {
1251 if (ctx->mountfamily != ctx->mount_server.address.sa_family)
1252 goto out_mountproto_mismatch;
1253 } else {
1254 if (ctx->mountfamily != ctx->nfs_server.address.sa_family)
1255 goto out_mountproto_mismatch;
1256 }
1257 }
1258
1259 if (!nfs_verify_server_address(sap))
1260 goto out_no_address;
1261
1262 if (ctx->version == 4) {
1263 if (IS_ENABLED(CONFIG_NFS_V4)) {
1264 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
1265 port = NFS_RDMA_PORT;
1266 else
1267 port = NFS_PORT;
1268 max_namelen = NFS4_MAXNAMLEN;
1269 max_pathlen = NFS4_MAXPATHLEN;
1270 nfs_validate_transport_protocol(ctx);
1271 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
1272 goto out_invalid_transport_udp;
1273 ctx->flags &= ~(NFS_MOUNT_NONLM | NFS_MOUNT_NOACL |
1274 NFS_MOUNT_VER3 | NFS_MOUNT_LOCAL_FLOCK |
1275 NFS_MOUNT_LOCAL_FCNTL);
1276 } else {
1277 goto out_v4_not_compiled;
1278 }
1279 } else {
1280 nfs_set_mount_transport_protocol(ctx);
1281 #ifdef CONFIG_NFS_DISABLE_UDP_SUPPORT
1282 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
1283 goto out_invalid_transport_udp;
1284 #endif
1285 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
1286 port = NFS_RDMA_PORT;
1287 }
1288
1289 nfs_set_port(sap, &ctx->nfs_server.port, port);
1290
1291 ret = nfs_parse_source(fc, max_namelen, max_pathlen);
1292 if (ret < 0)
1293 return ret;
1294
1295 /* Load the NFS protocol module if we haven't done so yet */
1296 if (!ctx->nfs_mod) {
1297 nfs_mod = get_nfs_version(ctx->version);
1298 if (IS_ERR(nfs_mod)) {
1299 ret = PTR_ERR(nfs_mod);
1300 goto out_version_unavailable;
1301 }
1302 ctx->nfs_mod = nfs_mod;
1303 }
1304
1305 /* Ensure the filesystem context has the correct fs_type */
1306 if (fc->fs_type != ctx->nfs_mod->nfs_fs) {
1307 module_put(fc->fs_type->owner);
1308 __module_get(ctx->nfs_mod->nfs_fs->owner);
1309 fc->fs_type = ctx->nfs_mod->nfs_fs;
1310 }
1311 return 0;
1312
1313 out_no_device_name:
1314 return nfs_invalf(fc, "NFS: Device name not specified");
1315 out_v4_not_compiled:
1316 nfs_errorf(fc, "NFS: NFSv4 is not compiled into kernel");
1317 return -EPROTONOSUPPORT;
1318 out_invalid_transport_udp:
1319 return nfs_invalf(fc, "NFS: Unsupported transport protocol udp");
1320 out_no_address:
1321 return nfs_invalf(fc, "NFS: mount program didn't pass remote address");
1322 out_mountproto_mismatch:
1323 return nfs_invalf(fc, "NFS: Mount server address does not match mountproto= option");
1324 out_proto_mismatch:
1325 return nfs_invalf(fc, "NFS: Server address does not match proto= option");
1326 out_minorversion_mismatch:
1327 return nfs_invalf(fc, "NFS: Mount option vers=%u does not support minorversion=%u",
1328 ctx->version, ctx->minorversion);
1329 out_migration_misuse:
1330 return nfs_invalf(fc, "NFS: 'Migration' not supported for this NFS version");
1331 out_version_unavailable:
1332 nfs_errorf(fc, "NFS: Version unavailable");
1333 return ret;
1334 }
1335
1336 /*
1337 * Create an NFS superblock by the appropriate method.
1338 */
1339 static int nfs_get_tree(struct fs_context *fc)
1340 {
1341 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1342 int err = nfs_fs_context_validate(fc);
1343
1344 if (err)
1345 return err;
1346 if (!ctx->internal)
1347 return ctx->nfs_mod->rpc_ops->try_get_tree(fc);
1348 else
1349 return nfs_get_tree_common(fc);
1350 }
1351
1352 /*
1353 * Handle duplication of a configuration. The caller copied *src into *sc, but
1354 * it can't deal with resource pointers in the filesystem context, so we have
1355 * to do that. We need to clear pointers, copy data or get extra refs as
1356 * appropriate.
1357 */
1358 static int nfs_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)
1359 {
1360 struct nfs_fs_context *src = nfs_fc2context(src_fc), *ctx;
1361
1362 ctx = kmemdup(src, sizeof(struct nfs_fs_context), GFP_KERNEL);
1363 if (!ctx)
1364 return -ENOMEM;
1365
1366 ctx->mntfh = nfs_alloc_fhandle();
1367 if (!ctx->mntfh) {
1368 kfree(ctx);
1369 return -ENOMEM;
1370 }
1371 nfs_copy_fh(ctx->mntfh, src->mntfh);
1372
1373 __module_get(ctx->nfs_mod->owner);
1374 ctx->client_address = NULL;
1375 ctx->mount_server.hostname = NULL;
1376 ctx->nfs_server.export_path = NULL;
1377 ctx->nfs_server.hostname = NULL;
1378 ctx->fscache_uniq = NULL;
1379 ctx->clone_data.fattr = NULL;
1380 fc->fs_private = ctx;
1381 return 0;
1382 }
1383
1384 static void nfs_fs_context_free(struct fs_context *fc)
1385 {
1386 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1387
1388 if (ctx) {
1389 if (ctx->server)
1390 nfs_free_server(ctx->server);
1391 if (ctx->nfs_mod)
1392 put_nfs_version(ctx->nfs_mod);
1393 kfree(ctx->client_address);
1394 kfree(ctx->mount_server.hostname);
1395 kfree(ctx->nfs_server.export_path);
1396 kfree(ctx->nfs_server.hostname);
1397 kfree(ctx->fscache_uniq);
1398 nfs_free_fhandle(ctx->mntfh);
1399 nfs_free_fattr(ctx->clone_data.fattr);
1400 kfree(ctx);
1401 }
1402 }
1403
1404 static const struct fs_context_operations nfs_fs_context_ops = {
1405 .free = nfs_fs_context_free,
1406 .dup = nfs_fs_context_dup,
1407 .parse_param = nfs_fs_context_parse_param,
1408 .parse_monolithic = nfs_fs_context_parse_monolithic,
1409 .get_tree = nfs_get_tree,
1410 .reconfigure = nfs_reconfigure,
1411 };
1412
1413 /*
1414 * Prepare superblock configuration. We use the namespaces attached to the
1415 * context. This may be the current process's namespaces, or it may be a
1416 * container's namespaces.
1417 */
1418 static int nfs_init_fs_context(struct fs_context *fc)
1419 {
1420 struct nfs_fs_context *ctx;
1421
1422 ctx = kzalloc(sizeof(struct nfs_fs_context), GFP_KERNEL);
1423 if (unlikely(!ctx))
1424 return -ENOMEM;
1425
1426 ctx->mntfh = nfs_alloc_fhandle();
1427 if (unlikely(!ctx->mntfh)) {
1428 kfree(ctx);
1429 return -ENOMEM;
1430 }
1431
1432 ctx->protofamily = AF_UNSPEC;
1433 ctx->mountfamily = AF_UNSPEC;
1434 ctx->mount_server.port = NFS_UNSPEC_PORT;
1435
1436 if (fc->root) {
1437 /* reconfigure, start with the current config */
1438 struct nfs_server *nfss = fc->root->d_sb->s_fs_info;
1439 struct net *net = nfss->nfs_client->cl_net;
1440
1441 ctx->flags = nfss->flags;
1442 ctx->rsize = nfss->rsize;
1443 ctx->wsize = nfss->wsize;
1444 ctx->retrans = nfss->client->cl_timeout->to_retries;
1445 ctx->selected_flavor = nfss->client->cl_auth->au_flavor;
1446 ctx->acregmin = nfss->acregmin / HZ;
1447 ctx->acregmax = nfss->acregmax / HZ;
1448 ctx->acdirmin = nfss->acdirmin / HZ;
1449 ctx->acdirmax = nfss->acdirmax / HZ;
1450 ctx->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1451 ctx->nfs_server.port = nfss->port;
1452 ctx->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1453 ctx->version = nfss->nfs_client->rpc_ops->version;
1454 ctx->minorversion = nfss->nfs_client->cl_minorversion;
1455
1456 memcpy(&ctx->nfs_server.address, &nfss->nfs_client->cl_addr,
1457 ctx->nfs_server.addrlen);
1458
1459 if (fc->net_ns != net) {
1460 put_net(fc->net_ns);
1461 fc->net_ns = get_net(net);
1462 }
1463
1464 ctx->nfs_mod = nfss->nfs_client->cl_nfs_mod;
1465 __module_get(ctx->nfs_mod->owner);
1466 } else {
1467 /* defaults */
1468 ctx->timeo = NFS_UNSPEC_TIMEO;
1469 ctx->retrans = NFS_UNSPEC_RETRANS;
1470 ctx->acregmin = NFS_DEF_ACREGMIN;
1471 ctx->acregmax = NFS_DEF_ACREGMAX;
1472 ctx->acdirmin = NFS_DEF_ACDIRMIN;
1473 ctx->acdirmax = NFS_DEF_ACDIRMAX;
1474 ctx->nfs_server.port = NFS_UNSPEC_PORT;
1475 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1476 ctx->selected_flavor = RPC_AUTH_MAXFLAVOR;
1477 ctx->minorversion = 0;
1478 ctx->need_mount = true;
1479 }
1480 fc->fs_private = ctx;
1481 fc->ops = &nfs_fs_context_ops;
1482 return 0;
1483 }
1484
1485 struct file_system_type nfs_fs_type = {
1486 .owner = THIS_MODULE,
1487 .name = "nfs",
1488 .init_fs_context = nfs_init_fs_context,
1489 .parameters = nfs_fs_parameters,
1490 .kill_sb = nfs_kill_super,
1491 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
1492 };
1493 MODULE_ALIAS_FS("nfs");
1494 EXPORT_SYMBOL_GPL(nfs_fs_type);
1495
1496 #if IS_ENABLED(CONFIG_NFS_V4)
1497 struct file_system_type nfs4_fs_type = {
1498 .owner = THIS_MODULE,
1499 .name = "nfs4",
1500 .init_fs_context = nfs_init_fs_context,
1501 .parameters = nfs_fs_parameters,
1502 .kill_sb = nfs_kill_super,
1503 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
1504 };
1505 MODULE_ALIAS_FS("nfs4");
1506 MODULE_ALIAS("nfs4");
1507 EXPORT_SYMBOL_GPL(nfs4_fs_type);
1508 #endif /* CONFIG_NFS_V4 */
Ubuntu Hirsute Linux kernel mirror