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