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/compat.h>
14#include <linux/module.h>
15#include <linux/fs.h>
16#include <linux/fs_context.h>
17#include <linux/fs_parser.h>
18#include <linux/nfs_fs.h>
19#include <linux/nfs_mount.h>
20#include <linux/nfs4_mount.h>
21
22#include <net/handshake.h>
23
24#include "nfs.h"
25#include "internal.h"
26
27#include "nfstrace.h"
28
29#define NFSDBG_FACILITY NFSDBG_MOUNT
30
31#if IS_ENABLED(CONFIG_NFS_V3)
32#define NFS_DEFAULT_VERSION 3
33#else
34#define NFS_DEFAULT_VERSION 2
35#endif
36
37#define NFS_MAX_CONNECTIONS 16
38
39enum nfs_param {
40 Opt_ac,
41 Opt_acdirmax,
42 Opt_acdirmin,
43 Opt_acl,
44 Opt_acregmax,
45 Opt_acregmin,
46 Opt_actimeo,
47 Opt_addr,
48 Opt_bg,
49 Opt_bsize,
50 Opt_clientaddr,
51 Opt_cto,
52 Opt_fg,
53 Opt_fscache,
54 Opt_fscache_flag,
55 Opt_hard,
56 Opt_intr,
57 Opt_local_lock,
58 Opt_lock,
59 Opt_lookupcache,
60 Opt_migration,
61 Opt_minorversion,
62 Opt_mountaddr,
63 Opt_mounthost,
64 Opt_mountport,
65 Opt_mountproto,
66 Opt_mountvers,
67 Opt_namelen,
68 Opt_nconnect,
69 Opt_max_connect,
70 Opt_port,
71 Opt_posix,
72 Opt_proto,
73 Opt_rdirplus,
74 Opt_rdma,
75 Opt_resvport,
76 Opt_retrans,
77 Opt_retry,
78 Opt_rsize,
79 Opt_sec,
80 Opt_sharecache,
81 Opt_sloppy,
82 Opt_soft,
83 Opt_softerr,
84 Opt_softreval,
85 Opt_source,
86 Opt_tcp,
87 Opt_timeo,
88 Opt_trunkdiscovery,
89 Opt_udp,
90 Opt_v,
91 Opt_vers,
92 Opt_wsize,
93 Opt_write,
94 Opt_xprtsec,
95};
96
97enum {
98 Opt_local_lock_all,
99 Opt_local_lock_flock,
100 Opt_local_lock_none,
101 Opt_local_lock_posix,
102};
103
104static const struct constant_table nfs_param_enums_local_lock[] = {
105 { "all", Opt_local_lock_all },
106 { "flock", Opt_local_lock_flock },
107 { "posix", Opt_local_lock_posix },
108 { "none", Opt_local_lock_none },
109 {}
110};
111
112enum {
113 Opt_lookupcache_all,
114 Opt_lookupcache_none,
115 Opt_lookupcache_positive,
116};
117
118static const struct constant_table nfs_param_enums_lookupcache[] = {
119 { "all", Opt_lookupcache_all },
120 { "none", Opt_lookupcache_none },
121 { "pos", Opt_lookupcache_positive },
122 { "positive", Opt_lookupcache_positive },
123 {}
124};
125
126enum {
127 Opt_write_lazy,
128 Opt_write_eager,
129 Opt_write_wait,
130};
131
132static const struct constant_table nfs_param_enums_write[] = {
133 { "lazy", Opt_write_lazy },
134 { "eager", Opt_write_eager },
135 { "wait", Opt_write_wait },
136 {}
137};
138
139static const struct fs_parameter_spec nfs_fs_parameters[] = {
140 fsparam_flag_no("ac", Opt_ac),
141 fsparam_u32 ("acdirmax", Opt_acdirmax),
142 fsparam_u32 ("acdirmin", Opt_acdirmin),
143 fsparam_flag_no("acl", Opt_acl),
144 fsparam_u32 ("acregmax", Opt_acregmax),
145 fsparam_u32 ("acregmin", Opt_acregmin),
146 fsparam_u32 ("actimeo", Opt_actimeo),
147 fsparam_string("addr", Opt_addr),
148 fsparam_flag ("bg", Opt_bg),
149 fsparam_u32 ("bsize", Opt_bsize),
150 fsparam_string("clientaddr", Opt_clientaddr),
151 fsparam_flag_no("cto", Opt_cto),
152 fsparam_flag ("fg", Opt_fg),
153 fsparam_flag_no("fsc", Opt_fscache_flag),
154 fsparam_string("fsc", Opt_fscache),
155 fsparam_flag ("hard", Opt_hard),
156 __fsparam(NULL, "intr", Opt_intr,
157 fs_param_neg_with_no|fs_param_deprecated, NULL),
158 fsparam_enum ("local_lock", Opt_local_lock, nfs_param_enums_local_lock),
159 fsparam_flag_no("lock", Opt_lock),
160 fsparam_enum ("lookupcache", Opt_lookupcache, nfs_param_enums_lookupcache),
161 fsparam_flag_no("migration", Opt_migration),
162 fsparam_u32 ("minorversion", Opt_minorversion),
163 fsparam_string("mountaddr", Opt_mountaddr),
164 fsparam_string("mounthost", Opt_mounthost),
165 fsparam_u32 ("mountport", Opt_mountport),
166 fsparam_string("mountproto", Opt_mountproto),
167 fsparam_u32 ("mountvers", Opt_mountvers),
168 fsparam_u32 ("namlen", Opt_namelen),
169 fsparam_u32 ("nconnect", Opt_nconnect),
170 fsparam_u32 ("max_connect", Opt_max_connect),
171 fsparam_string("nfsvers", Opt_vers),
172 fsparam_u32 ("port", Opt_port),
173 fsparam_flag_no("posix", Opt_posix),
174 fsparam_string("proto", Opt_proto),
175 fsparam_flag_no("rdirplus", Opt_rdirplus),
176 fsparam_flag ("rdma", Opt_rdma),
177 fsparam_flag_no("resvport", Opt_resvport),
178 fsparam_u32 ("retrans", Opt_retrans),
179 fsparam_string("retry", Opt_retry),
180 fsparam_u32 ("rsize", Opt_rsize),
181 fsparam_string("sec", Opt_sec),
182 fsparam_flag_no("sharecache", Opt_sharecache),
183 fsparam_flag ("sloppy", Opt_sloppy),
184 fsparam_flag ("soft", Opt_soft),
185 fsparam_flag ("softerr", Opt_softerr),
186 fsparam_flag ("softreval", Opt_softreval),
187 fsparam_string("source", Opt_source),
188 fsparam_flag ("tcp", Opt_tcp),
189 fsparam_u32 ("timeo", Opt_timeo),
190 fsparam_flag_no("trunkdiscovery", Opt_trunkdiscovery),
191 fsparam_flag ("udp", Opt_udp),
192 fsparam_flag ("v2", Opt_v),
193 fsparam_flag ("v3", Opt_v),
194 fsparam_flag ("v4", Opt_v),
195 fsparam_flag ("v4.0", Opt_v),
196 fsparam_flag ("v4.1", Opt_v),
197 fsparam_flag ("v4.2", Opt_v),
198 fsparam_string("vers", Opt_vers),
199 fsparam_enum ("write", Opt_write, nfs_param_enums_write),
200 fsparam_u32 ("wsize", Opt_wsize),
201 fsparam_string("xprtsec", Opt_xprtsec),
202 {}
203};
204
205enum {
206 Opt_vers_2,
207 Opt_vers_3,
208 Opt_vers_4,
209 Opt_vers_4_0,
210 Opt_vers_4_1,
211 Opt_vers_4_2,
212};
213
214static const struct constant_table nfs_vers_tokens[] = {
215 { "2", Opt_vers_2 },
216 { "3", Opt_vers_3 },
217 { "4", Opt_vers_4 },
218 { "4.0", Opt_vers_4_0 },
219 { "4.1", Opt_vers_4_1 },
220 { "4.2", Opt_vers_4_2 },
221 {}
222};
223
224enum {
225 Opt_xprt_rdma,
226 Opt_xprt_rdma6,
227 Opt_xprt_tcp,
228 Opt_xprt_tcp6,
229 Opt_xprt_udp,
230 Opt_xprt_udp6,
231 nr__Opt_xprt
232};
233
234static const struct constant_table nfs_xprt_protocol_tokens[] = {
235 { "rdma", Opt_xprt_rdma },
236 { "rdma6", Opt_xprt_rdma6 },
237 { "tcp", Opt_xprt_tcp },
238 { "tcp6", Opt_xprt_tcp6 },
239 { "udp", Opt_xprt_udp },
240 { "udp6", Opt_xprt_udp6 },
241 {}
242};
243
244enum {
245 Opt_sec_krb5,
246 Opt_sec_krb5i,
247 Opt_sec_krb5p,
248 Opt_sec_lkey,
249 Opt_sec_lkeyi,
250 Opt_sec_lkeyp,
251 Opt_sec_none,
252 Opt_sec_spkm,
253 Opt_sec_spkmi,
254 Opt_sec_spkmp,
255 Opt_sec_sys,
256 nr__Opt_sec
257};
258
259static const struct constant_table nfs_secflavor_tokens[] = {
260 { "krb5", Opt_sec_krb5 },
261 { "krb5i", Opt_sec_krb5i },
262 { "krb5p", Opt_sec_krb5p },
263 { "lkey", Opt_sec_lkey },
264 { "lkeyi", Opt_sec_lkeyi },
265 { "lkeyp", Opt_sec_lkeyp },
266 { "none", Opt_sec_none },
267 { "null", Opt_sec_none },
268 { "spkm3", Opt_sec_spkm },
269 { "spkm3i", Opt_sec_spkmi },
270 { "spkm3p", Opt_sec_spkmp },
271 { "sys", Opt_sec_sys },
272 {}
273};
274
275enum {
276 Opt_xprtsec_none,
277 Opt_xprtsec_tls,
278 Opt_xprtsec_mtls,
279 nr__Opt_xprtsec
280};
281
282static const struct constant_table nfs_xprtsec_policies[] = {
283 { "none", Opt_xprtsec_none },
284 { "tls", Opt_xprtsec_tls },
285 { "mtls", Opt_xprtsec_mtls },
286 {}
287};
288
289/*
290 * Sanity-check a server address provided by the mount command.
291 *
292 * Address family must be initialized, and address must not be
293 * the ANY address for that family.
294 */
295static int nfs_verify_server_address(struct sockaddr_storage *addr)
296{
297 switch (addr->ss_family) {
298 case AF_INET: {
299 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
300 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
301 }
302 case AF_INET6: {
303 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
304 return !ipv6_addr_any(a: sa);
305 }
306 }
307
308 return 0;
309}
310
311#ifdef CONFIG_NFS_DISABLE_UDP_SUPPORT
312static bool nfs_server_transport_udp_invalid(const struct nfs_fs_context *ctx)
313{
314 return true;
315}
316#else
317static bool nfs_server_transport_udp_invalid(const struct nfs_fs_context *ctx)
318{
319 if (ctx->version == 4)
320 return true;
321 return false;
322}
323#endif
324
325/*
326 * Sanity check the NFS transport protocol.
327 */
328static int nfs_validate_transport_protocol(struct fs_context *fc,
329 struct nfs_fs_context *ctx)
330{
331 switch (ctx->nfs_server.protocol) {
332 case XPRT_TRANSPORT_UDP:
333 if (nfs_server_transport_udp_invalid(ctx))
334 goto out_invalid_transport_udp;
335 break;
336 case XPRT_TRANSPORT_TCP:
337 case XPRT_TRANSPORT_RDMA:
338 break;
339 default:
340 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
341 }
342
343 if (ctx->xprtsec.policy != RPC_XPRTSEC_NONE)
344 switch (ctx->nfs_server.protocol) {
345 case XPRT_TRANSPORT_TCP:
346 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP_TLS;
347 break;
348 default:
349 goto out_invalid_xprtsec_policy;
350 }
351
352 return 0;
353out_invalid_transport_udp:
354 return nfs_invalf(fc, "NFS: Unsupported transport protocol udp");
355out_invalid_xprtsec_policy:
356 return nfs_invalf(fc, "NFS: Transport does not support xprtsec");
357}
358
359/*
360 * For text based NFSv2/v3 mounts, the mount protocol transport default
361 * settings should depend upon the specified NFS transport.
362 */
363static void nfs_set_mount_transport_protocol(struct nfs_fs_context *ctx)
364{
365 if (ctx->mount_server.protocol == XPRT_TRANSPORT_UDP ||
366 ctx->mount_server.protocol == XPRT_TRANSPORT_TCP)
367 return;
368 switch (ctx->nfs_server.protocol) {
369 case XPRT_TRANSPORT_UDP:
370 ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
371 break;
372 case XPRT_TRANSPORT_TCP:
373 case XPRT_TRANSPORT_RDMA:
374 ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
375 }
376}
377
378/*
379 * Add 'flavor' to 'auth_info' if not already present.
380 * Returns true if 'flavor' ends up in the list, false otherwise
381 */
382static int nfs_auth_info_add(struct fs_context *fc,
383 struct nfs_auth_info *auth_info,
384 rpc_authflavor_t flavor)
385{
386 unsigned int i;
387 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
388
389 /* make sure this flavor isn't already in the list */
390 for (i = 0; i < auth_info->flavor_len; i++) {
391 if (flavor == auth_info->flavors[i])
392 return 0;
393 }
394
395 if (auth_info->flavor_len + 1 >= max_flavor_len)
396 return nfs_invalf(fc, "NFS: too many sec= flavors");
397
398 auth_info->flavors[auth_info->flavor_len++] = flavor;
399 return 0;
400}
401
402/*
403 * Parse the value of the 'sec=' option.
404 */
405static int nfs_parse_security_flavors(struct fs_context *fc,
406 struct fs_parameter *param)
407{
408 struct nfs_fs_context *ctx = nfs_fc2context(fc);
409 rpc_authflavor_t pseudoflavor;
410 char *string = param->string, *p;
411 int ret;
412
413 trace_nfs_mount_assign(option: param->key, value: string);
414
415 while ((p = strsep(&string, ":")) != NULL) {
416 if (!*p)
417 continue;
418 switch (lookup_constant(tbl: nfs_secflavor_tokens, name: p, not_found: -1)) {
419 case Opt_sec_none:
420 pseudoflavor = RPC_AUTH_NULL;
421 break;
422 case Opt_sec_sys:
423 pseudoflavor = RPC_AUTH_UNIX;
424 break;
425 case Opt_sec_krb5:
426 pseudoflavor = RPC_AUTH_GSS_KRB5;
427 break;
428 case Opt_sec_krb5i:
429 pseudoflavor = RPC_AUTH_GSS_KRB5I;
430 break;
431 case Opt_sec_krb5p:
432 pseudoflavor = RPC_AUTH_GSS_KRB5P;
433 break;
434 case Opt_sec_lkey:
435 pseudoflavor = RPC_AUTH_GSS_LKEY;
436 break;
437 case Opt_sec_lkeyi:
438 pseudoflavor = RPC_AUTH_GSS_LKEYI;
439 break;
440 case Opt_sec_lkeyp:
441 pseudoflavor = RPC_AUTH_GSS_LKEYP;
442 break;
443 case Opt_sec_spkm:
444 pseudoflavor = RPC_AUTH_GSS_SPKM;
445 break;
446 case Opt_sec_spkmi:
447 pseudoflavor = RPC_AUTH_GSS_SPKMI;
448 break;
449 case Opt_sec_spkmp:
450 pseudoflavor = RPC_AUTH_GSS_SPKMP;
451 break;
452 default:
453 return nfs_invalf(fc, "NFS: sec=%s option not recognized", p);
454 }
455
456 ret = nfs_auth_info_add(fc, auth_info: &ctx->auth_info, flavor: pseudoflavor);
457 if (ret < 0)
458 return ret;
459 }
460
461 return 0;
462}
463
464static int nfs_parse_xprtsec_policy(struct fs_context *fc,
465 struct fs_parameter *param)
466{
467 struct nfs_fs_context *ctx = nfs_fc2context(fc);
468
469 trace_nfs_mount_assign(option: param->key, value: param->string);
470
471 switch (lookup_constant(tbl: nfs_xprtsec_policies, name: param->string, not_found: -1)) {
472 case Opt_xprtsec_none:
473 ctx->xprtsec.policy = RPC_XPRTSEC_NONE;
474 break;
475 case Opt_xprtsec_tls:
476 ctx->xprtsec.policy = RPC_XPRTSEC_TLS_ANON;
477 break;
478 case Opt_xprtsec_mtls:
479 ctx->xprtsec.policy = RPC_XPRTSEC_TLS_X509;
480 break;
481 default:
482 return nfs_invalf(fc, "NFS: Unrecognized transport security policy");
483 }
484 return 0;
485}
486
487static int nfs_parse_version_string(struct fs_context *fc,
488 const char *string)
489{
490 struct nfs_fs_context *ctx = nfs_fc2context(fc);
491
492 ctx->flags &= ~NFS_MOUNT_VER3;
493 switch (lookup_constant(tbl: nfs_vers_tokens, name: string, not_found: -1)) {
494 case Opt_vers_2:
495 ctx->version = 2;
496 break;
497 case Opt_vers_3:
498 ctx->flags |= NFS_MOUNT_VER3;
499 ctx->version = 3;
500 break;
501 case Opt_vers_4:
502 /* Backward compatibility option. In future,
503 * the mount program should always supply
504 * a NFSv4 minor version number.
505 */
506 ctx->version = 4;
507 break;
508 case Opt_vers_4_0:
509 ctx->version = 4;
510 ctx->minorversion = 0;
511 break;
512 case Opt_vers_4_1:
513 ctx->version = 4;
514 ctx->minorversion = 1;
515 break;
516 case Opt_vers_4_2:
517 ctx->version = 4;
518 ctx->minorversion = 2;
519 break;
520 default:
521 return nfs_invalf(fc, "NFS: Unsupported NFS version");
522 }
523 return 0;
524}
525
526/*
527 * Parse a single mount parameter.
528 */
529static int nfs_fs_context_parse_param(struct fs_context *fc,
530 struct fs_parameter *param)
531{
532 struct fs_parse_result result;
533 struct nfs_fs_context *ctx = nfs_fc2context(fc);
534 unsigned short protofamily, mountfamily;
535 unsigned int len;
536 int ret, opt;
537
538 trace_nfs_mount_option(param);
539
540 opt = fs_parse(fc, desc: nfs_fs_parameters, param, result: &result);
541 if (opt < 0)
542 return (opt == -ENOPARAM && ctx->sloppy) ? 1 : opt;
543
544 if (fc->security)
545 ctx->has_sec_mnt_opts = 1;
546
547 switch (opt) {
548 case Opt_source:
549 if (fc->source)
550 return nfs_invalf(fc, "NFS: Multiple sources not supported");
551 fc->source = param->string;
552 param->string = NULL;
553 break;
554
555 /*
556 * boolean options: foo/nofoo
557 */
558 case Opt_soft:
559 ctx->flags |= NFS_MOUNT_SOFT;
560 ctx->flags &= ~NFS_MOUNT_SOFTERR;
561 break;
562 case Opt_softerr:
563 ctx->flags |= NFS_MOUNT_SOFTERR | NFS_MOUNT_SOFTREVAL;
564 ctx->flags &= ~NFS_MOUNT_SOFT;
565 break;
566 case Opt_hard:
567 ctx->flags &= ~(NFS_MOUNT_SOFT |
568 NFS_MOUNT_SOFTERR |
569 NFS_MOUNT_SOFTREVAL);
570 break;
571 case Opt_softreval:
572 if (result.negated)
573 ctx->flags &= ~NFS_MOUNT_SOFTREVAL;
574 else
575 ctx->flags |= NFS_MOUNT_SOFTREVAL;
576 break;
577 case Opt_posix:
578 if (result.negated)
579 ctx->flags &= ~NFS_MOUNT_POSIX;
580 else
581 ctx->flags |= NFS_MOUNT_POSIX;
582 break;
583 case Opt_cto:
584 if (result.negated)
585 ctx->flags |= NFS_MOUNT_NOCTO;
586 else
587 ctx->flags &= ~NFS_MOUNT_NOCTO;
588 break;
589 case Opt_trunkdiscovery:
590 if (result.negated)
591 ctx->flags &= ~NFS_MOUNT_TRUNK_DISCOVERY;
592 else
593 ctx->flags |= NFS_MOUNT_TRUNK_DISCOVERY;
594 break;
595 case Opt_ac:
596 if (result.negated)
597 ctx->flags |= NFS_MOUNT_NOAC;
598 else
599 ctx->flags &= ~NFS_MOUNT_NOAC;
600 break;
601 case Opt_lock:
602 if (result.negated) {
603 ctx->flags |= NFS_MOUNT_NONLM;
604 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
605 } else {
606 ctx->flags &= ~NFS_MOUNT_NONLM;
607 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
608 }
609 break;
610 case Opt_udp:
611 ctx->flags &= ~NFS_MOUNT_TCP;
612 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
613 break;
614 case Opt_tcp:
615 case Opt_rdma:
616 ctx->flags |= NFS_MOUNT_TCP; /* for side protocols */
617 ret = xprt_find_transport_ident(param->key);
618 if (ret < 0)
619 goto out_bad_transport;
620 ctx->nfs_server.protocol = ret;
621 break;
622 case Opt_acl:
623 if (result.negated)
624 ctx->flags |= NFS_MOUNT_NOACL;
625 else
626 ctx->flags &= ~NFS_MOUNT_NOACL;
627 break;
628 case Opt_rdirplus:
629 if (result.negated)
630 ctx->flags |= NFS_MOUNT_NORDIRPLUS;
631 else
632 ctx->flags &= ~NFS_MOUNT_NORDIRPLUS;
633 break;
634 case Opt_sharecache:
635 if (result.negated)
636 ctx->flags |= NFS_MOUNT_UNSHARED;
637 else
638 ctx->flags &= ~NFS_MOUNT_UNSHARED;
639 break;
640 case Opt_resvport:
641 if (result.negated)
642 ctx->flags |= NFS_MOUNT_NORESVPORT;
643 else
644 ctx->flags &= ~NFS_MOUNT_NORESVPORT;
645 break;
646 case Opt_fscache_flag:
647 if (result.negated)
648 ctx->options &= ~NFS_OPTION_FSCACHE;
649 else
650 ctx->options |= NFS_OPTION_FSCACHE;
651 kfree(objp: ctx->fscache_uniq);
652 ctx->fscache_uniq = NULL;
653 break;
654 case Opt_fscache:
655 trace_nfs_mount_assign(option: param->key, value: param->string);
656 ctx->options |= NFS_OPTION_FSCACHE;
657 kfree(objp: ctx->fscache_uniq);
658 ctx->fscache_uniq = param->string;
659 param->string = NULL;
660 break;
661 case Opt_migration:
662 if (result.negated)
663 ctx->options &= ~NFS_OPTION_MIGRATION;
664 else
665 ctx->options |= NFS_OPTION_MIGRATION;
666 break;
667
668 /*
669 * options that take numeric values
670 */
671 case Opt_port:
672 if (result.uint_32 > USHRT_MAX)
673 goto out_of_bounds;
674 ctx->nfs_server.port = result.uint_32;
675 break;
676 case Opt_rsize:
677 ctx->rsize = result.uint_32;
678 break;
679 case Opt_wsize:
680 ctx->wsize = result.uint_32;
681 break;
682 case Opt_bsize:
683 ctx->bsize = result.uint_32;
684 break;
685 case Opt_timeo:
686 if (result.uint_32 < 1 || result.uint_32 > INT_MAX)
687 goto out_of_bounds;
688 ctx->timeo = result.uint_32;
689 break;
690 case Opt_retrans:
691 if (result.uint_32 > INT_MAX)
692 goto out_of_bounds;
693 ctx->retrans = result.uint_32;
694 break;
695 case Opt_acregmin:
696 ctx->acregmin = result.uint_32;
697 break;
698 case Opt_acregmax:
699 ctx->acregmax = result.uint_32;
700 break;
701 case Opt_acdirmin:
702 ctx->acdirmin = result.uint_32;
703 break;
704 case Opt_acdirmax:
705 ctx->acdirmax = result.uint_32;
706 break;
707 case Opt_actimeo:
708 ctx->acregmin = result.uint_32;
709 ctx->acregmax = result.uint_32;
710 ctx->acdirmin = result.uint_32;
711 ctx->acdirmax = result.uint_32;
712 break;
713 case Opt_namelen:
714 ctx->namlen = result.uint_32;
715 break;
716 case Opt_mountport:
717 if (result.uint_32 > USHRT_MAX)
718 goto out_of_bounds;
719 ctx->mount_server.port = result.uint_32;
720 break;
721 case Opt_mountvers:
722 if (result.uint_32 < NFS_MNT_VERSION ||
723 result.uint_32 > NFS_MNT3_VERSION)
724 goto out_of_bounds;
725 ctx->mount_server.version = result.uint_32;
726 break;
727 case Opt_minorversion:
728 if (result.uint_32 > NFS4_MAX_MINOR_VERSION)
729 goto out_of_bounds;
730 ctx->minorversion = result.uint_32;
731 break;
732
733 /*
734 * options that take text values
735 */
736 case Opt_v:
737 ret = nfs_parse_version_string(fc, string: param->key + 1);
738 if (ret < 0)
739 return ret;
740 break;
741 case Opt_vers:
742 if (!param->string)
743 goto out_invalid_value;
744 trace_nfs_mount_assign(option: param->key, value: param->string);
745 ret = nfs_parse_version_string(fc, string: param->string);
746 if (ret < 0)
747 return ret;
748 break;
749 case Opt_sec:
750 ret = nfs_parse_security_flavors(fc, param);
751 if (ret < 0)
752 return ret;
753 break;
754 case Opt_xprtsec:
755 ret = nfs_parse_xprtsec_policy(fc, param);
756 if (ret < 0)
757 return ret;
758 break;
759
760 case Opt_proto:
761 if (!param->string)
762 goto out_invalid_value;
763 trace_nfs_mount_assign(option: param->key, value: param->string);
764 protofamily = AF_INET;
765 switch (lookup_constant(tbl: nfs_xprt_protocol_tokens, name: param->string, not_found: -1)) {
766 case Opt_xprt_udp6:
767 protofamily = AF_INET6;
768 fallthrough;
769 case Opt_xprt_udp:
770 ctx->flags &= ~NFS_MOUNT_TCP;
771 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
772 break;
773 case Opt_xprt_tcp6:
774 protofamily = AF_INET6;
775 fallthrough;
776 case Opt_xprt_tcp:
777 ctx->flags |= NFS_MOUNT_TCP;
778 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
779 break;
780 case Opt_xprt_rdma6:
781 protofamily = AF_INET6;
782 fallthrough;
783 case Opt_xprt_rdma:
784 /* vector side protocols to TCP */
785 ctx->flags |= NFS_MOUNT_TCP;
786 ret = xprt_find_transport_ident(param->string);
787 if (ret < 0)
788 goto out_bad_transport;
789 ctx->nfs_server.protocol = ret;
790 break;
791 default:
792 goto out_bad_transport;
793 }
794
795 ctx->protofamily = protofamily;
796 break;
797
798 case Opt_mountproto:
799 if (!param->string)
800 goto out_invalid_value;
801 trace_nfs_mount_assign(option: param->key, value: param->string);
802 mountfamily = AF_INET;
803 switch (lookup_constant(tbl: nfs_xprt_protocol_tokens, name: param->string, not_found: -1)) {
804 case Opt_xprt_udp6:
805 mountfamily = AF_INET6;
806 fallthrough;
807 case Opt_xprt_udp:
808 ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
809 break;
810 case Opt_xprt_tcp6:
811 mountfamily = AF_INET6;
812 fallthrough;
813 case Opt_xprt_tcp:
814 ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
815 break;
816 case Opt_xprt_rdma: /* not used for side protocols */
817 default:
818 goto out_bad_transport;
819 }
820 ctx->mountfamily = mountfamily;
821 break;
822
823 case Opt_addr:
824 trace_nfs_mount_assign(option: param->key, value: param->string);
825 len = rpc_pton(fc->net_ns, param->string, param->size,
826 &ctx->nfs_server.address,
827 sizeof(ctx->nfs_server._address));
828 if (len == 0)
829 goto out_invalid_address;
830 ctx->nfs_server.addrlen = len;
831 break;
832 case Opt_clientaddr:
833 trace_nfs_mount_assign(option: param->key, value: param->string);
834 kfree(objp: ctx->client_address);
835 ctx->client_address = param->string;
836 param->string = NULL;
837 break;
838 case Opt_mounthost:
839 trace_nfs_mount_assign(option: param->key, value: param->string);
840 kfree(objp: ctx->mount_server.hostname);
841 ctx->mount_server.hostname = param->string;
842 param->string = NULL;
843 break;
844 case Opt_mountaddr:
845 trace_nfs_mount_assign(option: param->key, value: param->string);
846 len = rpc_pton(fc->net_ns, param->string, param->size,
847 &ctx->mount_server.address,
848 sizeof(ctx->mount_server._address));
849 if (len == 0)
850 goto out_invalid_address;
851 ctx->mount_server.addrlen = len;
852 break;
853 case Opt_nconnect:
854 trace_nfs_mount_assign(option: param->key, value: param->string);
855 if (result.uint_32 < 1 || result.uint_32 > NFS_MAX_CONNECTIONS)
856 goto out_of_bounds;
857 ctx->nfs_server.nconnect = result.uint_32;
858 break;
859 case Opt_max_connect:
860 trace_nfs_mount_assign(option: param->key, value: param->string);
861 if (result.uint_32 < 1 || result.uint_32 > NFS_MAX_TRANSPORTS)
862 goto out_of_bounds;
863 ctx->nfs_server.max_connect = result.uint_32;
864 break;
865 case Opt_lookupcache:
866 trace_nfs_mount_assign(option: param->key, value: param->string);
867 switch (result.uint_32) {
868 case Opt_lookupcache_all:
869 ctx->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
870 break;
871 case Opt_lookupcache_positive:
872 ctx->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
873 ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
874 break;
875 case Opt_lookupcache_none:
876 ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
877 break;
878 default:
879 goto out_invalid_value;
880 }
881 break;
882 case Opt_local_lock:
883 trace_nfs_mount_assign(option: param->key, value: param->string);
884 switch (result.uint_32) {
885 case Opt_local_lock_all:
886 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK |
887 NFS_MOUNT_LOCAL_FCNTL);
888 break;
889 case Opt_local_lock_flock:
890 ctx->flags |= NFS_MOUNT_LOCAL_FLOCK;
891 break;
892 case Opt_local_lock_posix:
893 ctx->flags |= NFS_MOUNT_LOCAL_FCNTL;
894 break;
895 case Opt_local_lock_none:
896 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
897 NFS_MOUNT_LOCAL_FCNTL);
898 break;
899 default:
900 goto out_invalid_value;
901 }
902 break;
903 case Opt_write:
904 trace_nfs_mount_assign(option: param->key, value: param->string);
905 switch (result.uint_32) {
906 case Opt_write_lazy:
907 ctx->flags &=
908 ~(NFS_MOUNT_WRITE_EAGER | NFS_MOUNT_WRITE_WAIT);
909 break;
910 case Opt_write_eager:
911 ctx->flags |= NFS_MOUNT_WRITE_EAGER;
912 ctx->flags &= ~NFS_MOUNT_WRITE_WAIT;
913 break;
914 case Opt_write_wait:
915 ctx->flags |=
916 NFS_MOUNT_WRITE_EAGER | NFS_MOUNT_WRITE_WAIT;
917 break;
918 default:
919 goto out_invalid_value;
920 }
921 break;
922
923 /*
924 * Special options
925 */
926 case Opt_sloppy:
927 ctx->sloppy = true;
928 break;
929 }
930
931 return 0;
932
933out_invalid_value:
934 return nfs_invalf(fc, "NFS: Bad mount option value specified");
935out_invalid_address:
936 return nfs_invalf(fc, "NFS: Bad IP address specified");
937out_of_bounds:
938 return nfs_invalf(fc, "NFS: Value for '%s' out of range", param->key);
939out_bad_transport:
940 return nfs_invalf(fc, "NFS: Unrecognized transport protocol");
941}
942
943/*
944 * Split fc->source into "hostname:export_path".
945 *
946 * The leftmost colon demarks the split between the server's hostname
947 * and the export path. If the hostname starts with a left square
948 * bracket, then it may contain colons.
949 *
950 * Note: caller frees hostname and export path, even on error.
951 */
952static int nfs_parse_source(struct fs_context *fc,
953 size_t maxnamlen, size_t maxpathlen)
954{
955 struct nfs_fs_context *ctx = nfs_fc2context(fc);
956 const char *dev_name = fc->source;
957 size_t len;
958 const char *end;
959
960 if (unlikely(!dev_name || !*dev_name))
961 return -EINVAL;
962
963 /* Is the host name protected with square brakcets? */
964 if (*dev_name == '[') {
965 end = strchr(++dev_name, ']');
966 if (end == NULL || end[1] != ':')
967 goto out_bad_devname;
968
969 len = end - dev_name;
970 end++;
971 } else {
972 const char *comma;
973
974 end = strchr(dev_name, ':');
975 if (end == NULL)
976 goto out_bad_devname;
977 len = end - dev_name;
978
979 /* kill possible hostname list: not supported */
980 comma = memchr(p: dev_name, c: ',', size: len);
981 if (comma)
982 len = comma - dev_name;
983 }
984
985 if (len > maxnamlen)
986 goto out_hostname;
987
988 kfree(objp: ctx->nfs_server.hostname);
989
990 /* N.B. caller will free nfs_server.hostname in all cases */
991 ctx->nfs_server.hostname = kmemdup_nul(s: dev_name, len, GFP_KERNEL);
992 if (!ctx->nfs_server.hostname)
993 goto out_nomem;
994 len = strlen(++end);
995 if (len > maxpathlen)
996 goto out_path;
997 ctx->nfs_server.export_path = kmemdup_nul(s: end, len, GFP_KERNEL);
998 if (!ctx->nfs_server.export_path)
999 goto out_nomem;
1000
1001 trace_nfs_mount_path(path: ctx->nfs_server.export_path);
1002 return 0;
1003
1004out_bad_devname:
1005 return nfs_invalf(fc, "NFS: device name not in host:path format");
1006out_nomem:
1007 nfs_errorf(fc, "NFS: not enough memory to parse device name");
1008 return -ENOMEM;
1009out_hostname:
1010 nfs_errorf(fc, "NFS: server hostname too long");
1011 return -ENAMETOOLONG;
1012out_path:
1013 nfs_errorf(fc, "NFS: export pathname too long");
1014 return -ENAMETOOLONG;
1015}
1016
1017static inline bool is_remount_fc(struct fs_context *fc)
1018{
1019 return fc->root != NULL;
1020}
1021
1022/*
1023 * Parse monolithic NFS2/NFS3 mount data
1024 * - fills in the mount root filehandle
1025 *
1026 * For option strings, user space handles the following behaviors:
1027 *
1028 * + DNS: mapping server host name to IP address ("addr=" option)
1029 *
1030 * + failure mode: how to behave if a mount request can't be handled
1031 * immediately ("fg/bg" option)
1032 *
1033 * + retry: how often to retry a mount request ("retry=" option)
1034 *
1035 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1036 * mountproto=tcp after mountproto=udp, and so on
1037 */
1038static int nfs23_parse_monolithic(struct fs_context *fc,
1039 struct nfs_mount_data *data)
1040{
1041 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1042 struct nfs_fh *mntfh = ctx->mntfh;
1043 struct sockaddr_storage *sap = &ctx->nfs_server._address;
1044 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
1045 int ret;
1046
1047 if (data == NULL)
1048 goto out_no_data;
1049
1050 ctx->version = NFS_DEFAULT_VERSION;
1051 switch (data->version) {
1052 case 1:
1053 data->namlen = 0;
1054 fallthrough;
1055 case 2:
1056 data->bsize = 0;
1057 fallthrough;
1058 case 3:
1059 if (data->flags & NFS_MOUNT_VER3)
1060 goto out_no_v3;
1061 data->root.size = NFS2_FHSIZE;
1062 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1063 /* Turn off security negotiation */
1064 extra_flags |= NFS_MOUNT_SECFLAVOUR;
1065 fallthrough;
1066 case 4:
1067 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1068 goto out_no_sec;
1069 fallthrough;
1070 case 5:
1071 memset(data->context, 0, sizeof(data->context));
1072 fallthrough;
1073 case 6:
1074 if (data->flags & NFS_MOUNT_VER3) {
1075 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1076 goto out_invalid_fh;
1077 mntfh->size = data->root.size;
1078 ctx->version = 3;
1079 } else {
1080 mntfh->size = NFS2_FHSIZE;
1081 ctx->version = 2;
1082 }
1083
1084
1085 memcpy(mntfh->data, data->root.data, mntfh->size);
1086 if (mntfh->size < sizeof(mntfh->data))
1087 memset(mntfh->data + mntfh->size, 0,
1088 sizeof(mntfh->data) - mntfh->size);
1089
1090 /*
1091 * for proto == XPRT_TRANSPORT_UDP, which is what uses
1092 * to_exponential, implying shift: limit the shift value
1093 * to BITS_PER_LONG (majortimeo is unsigned long)
1094 */
1095 if (!(data->flags & NFS_MOUNT_TCP)) /* this will be UDP */
1096 if (data->retrans >= 64) /* shift value is too large */
1097 goto out_invalid_data;
1098
1099 /*
1100 * Translate to nfs_fs_context, which nfs_fill_super
1101 * can deal with.
1102 */
1103 ctx->flags = data->flags & NFS_MOUNT_FLAGMASK;
1104 ctx->flags |= extra_flags;
1105 ctx->rsize = data->rsize;
1106 ctx->wsize = data->wsize;
1107 ctx->timeo = data->timeo;
1108 ctx->retrans = data->retrans;
1109 ctx->acregmin = data->acregmin;
1110 ctx->acregmax = data->acregmax;
1111 ctx->acdirmin = data->acdirmin;
1112 ctx->acdirmax = data->acdirmax;
1113 ctx->need_mount = false;
1114
1115 memcpy(sap, &data->addr, sizeof(data->addr));
1116 ctx->nfs_server.addrlen = sizeof(data->addr);
1117 ctx->nfs_server.port = ntohs(data->addr.sin_port);
1118 if (sap->ss_family != AF_INET ||
1119 !nfs_verify_server_address(addr: sap))
1120 goto out_no_address;
1121
1122 if (!(data->flags & NFS_MOUNT_TCP))
1123 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1124 /* N.B. caller will free nfs_server.hostname in all cases */
1125 ctx->nfs_server.hostname = kstrdup(s: data->hostname, GFP_KERNEL);
1126 if (!ctx->nfs_server.hostname)
1127 goto out_nomem;
1128
1129 ctx->namlen = data->namlen;
1130 ctx->bsize = data->bsize;
1131
1132 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1133 ctx->selected_flavor = data->pseudoflavor;
1134 else
1135 ctx->selected_flavor = RPC_AUTH_UNIX;
1136
1137 if (!(data->flags & NFS_MOUNT_NONLM))
1138 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1139 NFS_MOUNT_LOCAL_FCNTL);
1140 else
1141 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1142 NFS_MOUNT_LOCAL_FCNTL);
1143
1144 /*
1145 * The legacy version 6 binary mount data from userspace has a
1146 * field used only to transport selinux information into the
1147 * kernel. To continue to support that functionality we
1148 * have a touch of selinux knowledge here in the NFS code. The
1149 * userspace code converted context=blah to just blah so we are
1150 * converting back to the full string selinux understands.
1151 */
1152 if (data->context[0]){
1153#ifdef CONFIG_SECURITY_SELINUX
1154 int ret;
1155
1156 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1157 ret = vfs_parse_fs_string(fc, key: "context",
1158 value: data->context, strlen(data->context));
1159 if (ret < 0)
1160 return ret;
1161#else
1162 return -EINVAL;
1163#endif
1164 }
1165
1166 break;
1167 default:
1168 goto generic;
1169 }
1170
1171 ret = nfs_validate_transport_protocol(fc, ctx);
1172 if (ret)
1173 return ret;
1174
1175 ctx->skip_reconfig_option_check = true;
1176 return 0;
1177
1178generic:
1179 return generic_parse_monolithic(fc, data);
1180
1181out_no_data:
1182 if (is_remount_fc(fc)) {
1183 ctx->skip_reconfig_option_check = true;
1184 return 0;
1185 }
1186 return nfs_invalf(fc, "NFS: mount program didn't pass any mount data");
1187
1188out_no_v3:
1189 return nfs_invalf(fc, "NFS: nfs_mount_data version does not support v3");
1190
1191out_no_sec:
1192 return nfs_invalf(fc, "NFS: nfs_mount_data version supports only AUTH_SYS");
1193
1194out_nomem:
1195 return -ENOMEM;
1196
1197out_no_address:
1198 return nfs_invalf(fc, "NFS: mount program didn't pass remote address");
1199
1200out_invalid_fh:
1201 return nfs_invalf(fc, "NFS: invalid root filehandle");
1202
1203out_invalid_data:
1204 return nfs_invalf(fc, "NFS: invalid binary mount data");
1205}
1206
1207#if IS_ENABLED(CONFIG_NFS_V4)
1208struct compat_nfs_string {
1209 compat_uint_t len;
1210 compat_uptr_t data;
1211};
1212
1213static inline void compat_nfs_string(struct nfs_string *dst,
1214 struct compat_nfs_string *src)
1215{
1216 dst->data = compat_ptr(uptr: src->data);
1217 dst->len = src->len;
1218}
1219
1220struct compat_nfs4_mount_data_v1 {
1221 compat_int_t version;
1222 compat_int_t flags;
1223 compat_int_t rsize;
1224 compat_int_t wsize;
1225 compat_int_t timeo;
1226 compat_int_t retrans;
1227 compat_int_t acregmin;
1228 compat_int_t acregmax;
1229 compat_int_t acdirmin;
1230 compat_int_t acdirmax;
1231 struct compat_nfs_string client_addr;
1232 struct compat_nfs_string mnt_path;
1233 struct compat_nfs_string hostname;
1234 compat_uint_t host_addrlen;
1235 compat_uptr_t host_addr;
1236 compat_int_t proto;
1237 compat_int_t auth_flavourlen;
1238 compat_uptr_t auth_flavours;
1239};
1240
1241static void nfs4_compat_mount_data_conv(struct nfs4_mount_data *data)
1242{
1243 struct compat_nfs4_mount_data_v1 *compat =
1244 (struct compat_nfs4_mount_data_v1 *)data;
1245
1246 /* copy the fields backwards */
1247 data->auth_flavours = compat_ptr(uptr: compat->auth_flavours);
1248 data->auth_flavourlen = compat->auth_flavourlen;
1249 data->proto = compat->proto;
1250 data->host_addr = compat_ptr(uptr: compat->host_addr);
1251 data->host_addrlen = compat->host_addrlen;
1252 compat_nfs_string(dst: &data->hostname, src: &compat->hostname);
1253 compat_nfs_string(dst: &data->mnt_path, src: &compat->mnt_path);
1254 compat_nfs_string(dst: &data->client_addr, src: &compat->client_addr);
1255 data->acdirmax = compat->acdirmax;
1256 data->acdirmin = compat->acdirmin;
1257 data->acregmax = compat->acregmax;
1258 data->acregmin = compat->acregmin;
1259 data->retrans = compat->retrans;
1260 data->timeo = compat->timeo;
1261 data->wsize = compat->wsize;
1262 data->rsize = compat->rsize;
1263 data->flags = compat->flags;
1264 data->version = compat->version;
1265}
1266
1267/*
1268 * Validate NFSv4 mount options
1269 */
1270static int nfs4_parse_monolithic(struct fs_context *fc,
1271 struct nfs4_mount_data *data)
1272{
1273 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1274 struct sockaddr_storage *sap = &ctx->nfs_server._address;
1275 int ret;
1276 char *c;
1277
1278 if (!data) {
1279 if (is_remount_fc(fc))
1280 goto done;
1281 return nfs_invalf(fc,
1282 "NFS4: mount program didn't pass any mount data");
1283 }
1284
1285 ctx->version = 4;
1286
1287 if (data->version != 1)
1288 return generic_parse_monolithic(fc, data);
1289
1290 if (in_compat_syscall())
1291 nfs4_compat_mount_data_conv(data);
1292
1293 if (data->host_addrlen > sizeof(ctx->nfs_server.address))
1294 goto out_no_address;
1295 if (data->host_addrlen == 0)
1296 goto out_no_address;
1297 ctx->nfs_server.addrlen = data->host_addrlen;
1298 if (copy_from_user(to: sap, from: data->host_addr, n: data->host_addrlen))
1299 return -EFAULT;
1300 if (!nfs_verify_server_address(addr: sap))
1301 goto out_no_address;
1302 ctx->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
1303
1304 if (data->auth_flavourlen) {
1305 rpc_authflavor_t pseudoflavor;
1306
1307 if (data->auth_flavourlen > 1)
1308 goto out_inval_auth;
1309 if (copy_from_user(to: &pseudoflavor, from: data->auth_flavours,
1310 n: sizeof(pseudoflavor)))
1311 return -EFAULT;
1312 ctx->selected_flavor = pseudoflavor;
1313 } else {
1314 ctx->selected_flavor = RPC_AUTH_UNIX;
1315 }
1316
1317 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1318 if (IS_ERR(ptr: c))
1319 return PTR_ERR(ptr: c);
1320 ctx->nfs_server.hostname = c;
1321
1322 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1323 if (IS_ERR(ptr: c))
1324 return PTR_ERR(ptr: c);
1325 ctx->nfs_server.export_path = c;
1326 trace_nfs_mount_path(path: c);
1327
1328 c = strndup_user(data->client_addr.data, 16);
1329 if (IS_ERR(ptr: c))
1330 return PTR_ERR(ptr: c);
1331 ctx->client_address = c;
1332
1333 /*
1334 * Translate to nfs_fs_context, which nfs_fill_super
1335 * can deal with.
1336 */
1337
1338 ctx->flags = data->flags & NFS4_MOUNT_FLAGMASK;
1339 ctx->rsize = data->rsize;
1340 ctx->wsize = data->wsize;
1341 ctx->timeo = data->timeo;
1342 ctx->retrans = data->retrans;
1343 ctx->acregmin = data->acregmin;
1344 ctx->acregmax = data->acregmax;
1345 ctx->acdirmin = data->acdirmin;
1346 ctx->acdirmax = data->acdirmax;
1347 ctx->nfs_server.protocol = data->proto;
1348 ret = nfs_validate_transport_protocol(fc, ctx);
1349 if (ret)
1350 return ret;
1351done:
1352 ctx->skip_reconfig_option_check = true;
1353 return 0;
1354
1355out_inval_auth:
1356 return nfs_invalf(fc, "NFS4: Invalid number of RPC auth flavours %d",
1357 data->auth_flavourlen);
1358
1359out_no_address:
1360 return nfs_invalf(fc, "NFS4: mount program didn't pass remote address");
1361}
1362#endif
1363
1364/*
1365 * Parse a monolithic block of data from sys_mount().
1366 */
1367static int nfs_fs_context_parse_monolithic(struct fs_context *fc,
1368 void *data)
1369{
1370 if (fc->fs_type == &nfs_fs_type)
1371 return nfs23_parse_monolithic(fc, data);
1372
1373#if IS_ENABLED(CONFIG_NFS_V4)
1374 if (fc->fs_type == &nfs4_fs_type)
1375 return nfs4_parse_monolithic(fc, data);
1376#endif
1377
1378 return nfs_invalf(fc, "NFS: Unsupported monolithic data version");
1379}
1380
1381/*
1382 * Validate the preparsed information in the config.
1383 */
1384static int nfs_fs_context_validate(struct fs_context *fc)
1385{
1386 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1387 struct nfs_subversion *nfs_mod;
1388 struct sockaddr_storage *sap = &ctx->nfs_server._address;
1389 int max_namelen = PAGE_SIZE;
1390 int max_pathlen = NFS_MAXPATHLEN;
1391 int port = 0;
1392 int ret;
1393
1394 if (!fc->source)
1395 goto out_no_device_name;
1396
1397 /* Check for sanity first. */
1398 if (ctx->minorversion && ctx->version != 4)
1399 goto out_minorversion_mismatch;
1400
1401 if (ctx->options & NFS_OPTION_MIGRATION &&
1402 (ctx->version != 4 || ctx->minorversion != 0))
1403 goto out_migration_misuse;
1404
1405 /* Verify that any proto=/mountproto= options match the address
1406 * families in the addr=/mountaddr= options.
1407 */
1408 if (ctx->protofamily != AF_UNSPEC &&
1409 ctx->protofamily != ctx->nfs_server.address.sa_family)
1410 goto out_proto_mismatch;
1411
1412 if (ctx->mountfamily != AF_UNSPEC) {
1413 if (ctx->mount_server.addrlen) {
1414 if (ctx->mountfamily != ctx->mount_server.address.sa_family)
1415 goto out_mountproto_mismatch;
1416 } else {
1417 if (ctx->mountfamily != ctx->nfs_server.address.sa_family)
1418 goto out_mountproto_mismatch;
1419 }
1420 }
1421
1422 if (!nfs_verify_server_address(addr: sap))
1423 goto out_no_address;
1424
1425 ret = nfs_validate_transport_protocol(fc, ctx);
1426 if (ret)
1427 return ret;
1428
1429 if (ctx->version == 4) {
1430 if (IS_ENABLED(CONFIG_NFS_V4)) {
1431 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
1432 port = NFS_RDMA_PORT;
1433 else
1434 port = NFS_PORT;
1435 max_namelen = NFS4_MAXNAMLEN;
1436 max_pathlen = NFS4_MAXPATHLEN;
1437 ctx->flags &= ~(NFS_MOUNT_NONLM | NFS_MOUNT_NOACL |
1438 NFS_MOUNT_VER3 | NFS_MOUNT_LOCAL_FLOCK |
1439 NFS_MOUNT_LOCAL_FCNTL);
1440 } else {
1441 goto out_v4_not_compiled;
1442 }
1443 } else {
1444 nfs_set_mount_transport_protocol(ctx);
1445 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
1446 port = NFS_RDMA_PORT;
1447 }
1448
1449 nfs_set_port(sap, port: &ctx->nfs_server.port, default_port: port);
1450
1451 ret = nfs_parse_source(fc, maxnamlen: max_namelen, maxpathlen: max_pathlen);
1452 if (ret < 0)
1453 return ret;
1454
1455 /* Load the NFS protocol module if we haven't done so yet */
1456 if (!ctx->nfs_mod) {
1457 nfs_mod = get_nfs_version(ctx->version);
1458 if (IS_ERR(ptr: nfs_mod)) {
1459 ret = PTR_ERR(ptr: nfs_mod);
1460 goto out_version_unavailable;
1461 }
1462 ctx->nfs_mod = nfs_mod;
1463 }
1464
1465 /* Ensure the filesystem context has the correct fs_type */
1466 if (fc->fs_type != ctx->nfs_mod->nfs_fs) {
1467 module_put(module: fc->fs_type->owner);
1468 __module_get(module: ctx->nfs_mod->nfs_fs->owner);
1469 fc->fs_type = ctx->nfs_mod->nfs_fs;
1470 }
1471 return 0;
1472
1473out_no_device_name:
1474 return nfs_invalf(fc, "NFS: Device name not specified");
1475out_v4_not_compiled:
1476 nfs_errorf(fc, "NFS: NFSv4 is not compiled into kernel");
1477 return -EPROTONOSUPPORT;
1478out_no_address:
1479 return nfs_invalf(fc, "NFS: mount program didn't pass remote address");
1480out_mountproto_mismatch:
1481 return nfs_invalf(fc, "NFS: Mount server address does not match mountproto= option");
1482out_proto_mismatch:
1483 return nfs_invalf(fc, "NFS: Server address does not match proto= option");
1484out_minorversion_mismatch:
1485 return nfs_invalf(fc, "NFS: Mount option vers=%u does not support minorversion=%u",
1486 ctx->version, ctx->minorversion);
1487out_migration_misuse:
1488 return nfs_invalf(fc, "NFS: 'Migration' not supported for this NFS version");
1489out_version_unavailable:
1490 nfs_errorf(fc, "NFS: Version unavailable");
1491 return ret;
1492}
1493
1494/*
1495 * Create an NFS superblock by the appropriate method.
1496 */
1497static int nfs_get_tree(struct fs_context *fc)
1498{
1499 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1500 int err = nfs_fs_context_validate(fc);
1501
1502 if (err)
1503 return err;
1504 if (!ctx->internal)
1505 return ctx->nfs_mod->rpc_ops->try_get_tree(fc);
1506 else
1507 return nfs_get_tree_common(fc);
1508}
1509
1510/*
1511 * Handle duplication of a configuration. The caller copied *src into *sc, but
1512 * it can't deal with resource pointers in the filesystem context, so we have
1513 * to do that. We need to clear pointers, copy data or get extra refs as
1514 * appropriate.
1515 */
1516static int nfs_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)
1517{
1518 struct nfs_fs_context *src = nfs_fc2context(fc: src_fc), *ctx;
1519
1520 ctx = kmemdup(p: src, size: sizeof(struct nfs_fs_context), GFP_KERNEL);
1521 if (!ctx)
1522 return -ENOMEM;
1523
1524 ctx->mntfh = nfs_alloc_fhandle();
1525 if (!ctx->mntfh) {
1526 kfree(objp: ctx);
1527 return -ENOMEM;
1528 }
1529 nfs_copy_fh(target: ctx->mntfh, source: src->mntfh);
1530
1531 __module_get(module: ctx->nfs_mod->owner);
1532 ctx->client_address = NULL;
1533 ctx->mount_server.hostname = NULL;
1534 ctx->nfs_server.export_path = NULL;
1535 ctx->nfs_server.hostname = NULL;
1536 ctx->fscache_uniq = NULL;
1537 ctx->clone_data.fattr = NULL;
1538 fc->fs_private = ctx;
1539 return 0;
1540}
1541
1542static void nfs_fs_context_free(struct fs_context *fc)
1543{
1544 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1545
1546 if (ctx) {
1547 if (ctx->server)
1548 nfs_free_server(server: ctx->server);
1549 if (ctx->nfs_mod)
1550 put_nfs_version(ctx->nfs_mod);
1551 kfree(objp: ctx->client_address);
1552 kfree(objp: ctx->mount_server.hostname);
1553 kfree(objp: ctx->nfs_server.export_path);
1554 kfree(objp: ctx->nfs_server.hostname);
1555 kfree(objp: ctx->fscache_uniq);
1556 nfs_free_fhandle(fh: ctx->mntfh);
1557 nfs_free_fattr(fattr: ctx->clone_data.fattr);
1558 kfree(objp: ctx);
1559 }
1560}
1561
1562static const struct fs_context_operations nfs_fs_context_ops = {
1563 .free = nfs_fs_context_free,
1564 .dup = nfs_fs_context_dup,
1565 .parse_param = nfs_fs_context_parse_param,
1566 .parse_monolithic = nfs_fs_context_parse_monolithic,
1567 .get_tree = nfs_get_tree,
1568 .reconfigure = nfs_reconfigure,
1569};
1570
1571/*
1572 * Prepare superblock configuration. We use the namespaces attached to the
1573 * context. This may be the current process's namespaces, or it may be a
1574 * container's namespaces.
1575 */
1576static int nfs_init_fs_context(struct fs_context *fc)
1577{
1578 struct nfs_fs_context *ctx;
1579
1580 ctx = kzalloc(size: sizeof(struct nfs_fs_context), GFP_KERNEL);
1581 if (unlikely(!ctx))
1582 return -ENOMEM;
1583
1584 ctx->mntfh = nfs_alloc_fhandle();
1585 if (unlikely(!ctx->mntfh)) {
1586 kfree(objp: ctx);
1587 return -ENOMEM;
1588 }
1589
1590 ctx->protofamily = AF_UNSPEC;
1591 ctx->mountfamily = AF_UNSPEC;
1592 ctx->mount_server.port = NFS_UNSPEC_PORT;
1593
1594 if (fc->root) {
1595 /* reconfigure, start with the current config */
1596 struct nfs_server *nfss = fc->root->d_sb->s_fs_info;
1597 struct net *net = nfss->nfs_client->cl_net;
1598
1599 ctx->flags = nfss->flags;
1600 ctx->rsize = nfss->rsize;
1601 ctx->wsize = nfss->wsize;
1602 ctx->retrans = nfss->client->cl_timeout->to_retries;
1603 ctx->selected_flavor = nfss->client->cl_auth->au_flavor;
1604 ctx->acregmin = nfss->acregmin / HZ;
1605 ctx->acregmax = nfss->acregmax / HZ;
1606 ctx->acdirmin = nfss->acdirmin / HZ;
1607 ctx->acdirmax = nfss->acdirmax / HZ;
1608 ctx->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1609 ctx->nfs_server.port = nfss->port;
1610 ctx->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1611 ctx->version = nfss->nfs_client->rpc_ops->version;
1612 ctx->minorversion = nfss->nfs_client->cl_minorversion;
1613
1614 memcpy(&ctx->nfs_server._address, &nfss->nfs_client->cl_addr,
1615 ctx->nfs_server.addrlen);
1616
1617 if (fc->net_ns != net) {
1618 put_net(net: fc->net_ns);
1619 fc->net_ns = get_net(net);
1620 }
1621
1622 ctx->nfs_mod = nfss->nfs_client->cl_nfs_mod;
1623 __module_get(module: ctx->nfs_mod->owner);
1624 } else {
1625 /* defaults */
1626 ctx->timeo = NFS_UNSPEC_TIMEO;
1627 ctx->retrans = NFS_UNSPEC_RETRANS;
1628 ctx->acregmin = NFS_DEF_ACREGMIN;
1629 ctx->acregmax = NFS_DEF_ACREGMAX;
1630 ctx->acdirmin = NFS_DEF_ACDIRMIN;
1631 ctx->acdirmax = NFS_DEF_ACDIRMAX;
1632 ctx->nfs_server.port = NFS_UNSPEC_PORT;
1633 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1634 ctx->selected_flavor = RPC_AUTH_MAXFLAVOR;
1635 ctx->minorversion = 0;
1636 ctx->need_mount = true;
1637 ctx->xprtsec.policy = RPC_XPRTSEC_NONE;
1638 ctx->xprtsec.cert_serial = TLS_NO_CERT;
1639 ctx->xprtsec.privkey_serial = TLS_NO_PRIVKEY;
1640
1641 fc->s_iflags |= SB_I_STABLE_WRITES;
1642 }
1643 fc->fs_private = ctx;
1644 fc->ops = &nfs_fs_context_ops;
1645 return 0;
1646}
1647
1648struct file_system_type nfs_fs_type = {
1649 .owner = THIS_MODULE,
1650 .name = "nfs",
1651 .init_fs_context = nfs_init_fs_context,
1652 .parameters = nfs_fs_parameters,
1653 .kill_sb = nfs_kill_super,
1654 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
1655};
1656MODULE_ALIAS_FS("nfs");
1657EXPORT_SYMBOL_GPL(nfs_fs_type);
1658
1659#if IS_ENABLED(CONFIG_NFS_V4)
1660struct file_system_type nfs4_fs_type = {
1661 .owner = THIS_MODULE,
1662 .name = "nfs4",
1663 .init_fs_context = nfs_init_fs_context,
1664 .parameters = nfs_fs_parameters,
1665 .kill_sb = nfs_kill_super,
1666 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
1667};
1668MODULE_ALIAS_FS("nfs4");
1669MODULE_ALIAS("nfs4");
1670EXPORT_SYMBOL_GPL(nfs4_fs_type);
1671#endif /* CONFIG_NFS_V4 */
1672

source code of linux/fs/nfs/fs_context.c