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_alignwrite,
53 Opt_fatal_neterrors,
54 Opt_fg,
55 Opt_fscache,
56 Opt_fscache_flag,
57 Opt_hard,
58 Opt_intr,
59 Opt_local_lock,
60 Opt_lock,
61 Opt_lookupcache,
62 Opt_migration,
63 Opt_minorversion,
64 Opt_mountaddr,
65 Opt_mounthost,
66 Opt_mountport,
67 Opt_mountproto,
68 Opt_mountvers,
69 Opt_namelen,
70 Opt_nconnect,
71 Opt_max_connect,
72 Opt_port,
73 Opt_posix,
74 Opt_proto,
75 Opt_rdirplus,
76 Opt_rdirplus_none,
77 Opt_rdirplus_force,
78 Opt_rdma,
79 Opt_resvport,
80 Opt_retrans,
81 Opt_retry,
82 Opt_rsize,
83 Opt_sec,
84 Opt_sharecache,
85 Opt_sloppy,
86 Opt_soft,
87 Opt_softerr,
88 Opt_softreval,
89 Opt_source,
90 Opt_tcp,
91 Opt_timeo,
92 Opt_trunkdiscovery,
93 Opt_udp,
94 Opt_v,
95 Opt_vers,
96 Opt_wsize,
97 Opt_write,
98 Opt_xprtsec,
99 Opt_cert_serial,
100 Opt_privkey_serial,
101};
102
103enum {
104 Opt_fatal_neterrors_default,
105 Opt_fatal_neterrors_enetunreach,
106 Opt_fatal_neterrors_none,
107};
108
109static const struct constant_table nfs_param_enums_fatal_neterrors[] = {
110 { "default", Opt_fatal_neterrors_default },
111 { "ENETDOWN:ENETUNREACH", Opt_fatal_neterrors_enetunreach },
112 { "ENETUNREACH:ENETDOWN", Opt_fatal_neterrors_enetunreach },
113 { "none", Opt_fatal_neterrors_none },
114 {}
115};
116
117enum {
118 Opt_local_lock_all,
119 Opt_local_lock_flock,
120 Opt_local_lock_none,
121 Opt_local_lock_posix,
122};
123
124static const struct constant_table nfs_param_enums_local_lock[] = {
125 { "all", Opt_local_lock_all },
126 { "flock", Opt_local_lock_flock },
127 { "posix", Opt_local_lock_posix },
128 { "none", Opt_local_lock_none },
129 {}
130};
131
132enum {
133 Opt_lookupcache_all,
134 Opt_lookupcache_none,
135 Opt_lookupcache_positive,
136};
137
138static const struct constant_table nfs_param_enums_lookupcache[] = {
139 { "all", Opt_lookupcache_all },
140 { "none", Opt_lookupcache_none },
141 { "pos", Opt_lookupcache_positive },
142 { "positive", Opt_lookupcache_positive },
143 {}
144};
145
146enum {
147 Opt_write_lazy,
148 Opt_write_eager,
149 Opt_write_wait,
150};
151
152static const struct constant_table nfs_param_enums_write[] = {
153 { "lazy", Opt_write_lazy },
154 { "eager", Opt_write_eager },
155 { "wait", Opt_write_wait },
156 {}
157};
158
159static const struct fs_parameter_spec nfs_fs_parameters[] = {
160 fsparam_flag_no("ac", Opt_ac),
161 fsparam_u32 ("acdirmax", Opt_acdirmax),
162 fsparam_u32 ("acdirmin", Opt_acdirmin),
163 fsparam_flag_no("acl", Opt_acl),
164 fsparam_u32 ("acregmax", Opt_acregmax),
165 fsparam_u32 ("acregmin", Opt_acregmin),
166 fsparam_u32 ("actimeo", Opt_actimeo),
167 fsparam_string("addr", Opt_addr),
168 fsparam_flag ("bg", Opt_bg),
169 fsparam_u32 ("bsize", Opt_bsize),
170 fsparam_string("clientaddr", Opt_clientaddr),
171 fsparam_flag_no("cto", Opt_cto),
172 fsparam_flag_no("alignwrite", Opt_alignwrite),
173 fsparam_enum("fatal_neterrors", Opt_fatal_neterrors,
174 nfs_param_enums_fatal_neterrors),
175 fsparam_flag ("fg", Opt_fg),
176 fsparam_flag_no("fsc", Opt_fscache_flag),
177 fsparam_string("fsc", Opt_fscache),
178 fsparam_flag ("hard", Opt_hard),
179 __fsparam(NULL, "intr", Opt_intr,
180 fs_param_neg_with_no|fs_param_deprecated, NULL),
181 fsparam_enum ("local_lock", Opt_local_lock, nfs_param_enums_local_lock),
182 fsparam_flag_no("lock", Opt_lock),
183 fsparam_enum ("lookupcache", Opt_lookupcache, nfs_param_enums_lookupcache),
184 fsparam_flag_no("migration", Opt_migration),
185 fsparam_u32 ("minorversion", Opt_minorversion),
186 fsparam_string("mountaddr", Opt_mountaddr),
187 fsparam_string("mounthost", Opt_mounthost),
188 fsparam_u32 ("mountport", Opt_mountport),
189 fsparam_string("mountproto", Opt_mountproto),
190 fsparam_u32 ("mountvers", Opt_mountvers),
191 fsparam_u32 ("namlen", Opt_namelen),
192 fsparam_u32 ("nconnect", Opt_nconnect),
193 fsparam_u32 ("max_connect", Opt_max_connect),
194 fsparam_string("nfsvers", Opt_vers),
195 fsparam_u32 ("port", Opt_port),
196 fsparam_flag_no("posix", Opt_posix),
197 fsparam_string("proto", Opt_proto),
198 fsparam_flag_no("rdirplus", Opt_rdirplus), // rdirplus|nordirplus
199 fsparam_string("rdirplus", Opt_rdirplus), // rdirplus=...
200 fsparam_flag ("rdma", Opt_rdma),
201 fsparam_flag_no("resvport", Opt_resvport),
202 fsparam_u32 ("retrans", Opt_retrans),
203 fsparam_string("retry", Opt_retry),
204 fsparam_u32 ("rsize", Opt_rsize),
205 fsparam_string("sec", Opt_sec),
206 fsparam_flag_no("sharecache", Opt_sharecache),
207 fsparam_flag ("sloppy", Opt_sloppy),
208 fsparam_flag ("soft", Opt_soft),
209 fsparam_flag ("softerr", Opt_softerr),
210 fsparam_flag ("softreval", Opt_softreval),
211 fsparam_string("source", Opt_source),
212 fsparam_flag ("tcp", Opt_tcp),
213 fsparam_u32 ("timeo", Opt_timeo),
214 fsparam_flag_no("trunkdiscovery", Opt_trunkdiscovery),
215 fsparam_flag ("udp", Opt_udp),
216 fsparam_flag ("v2", Opt_v),
217 fsparam_flag ("v3", Opt_v),
218 fsparam_flag ("v4", Opt_v),
219 fsparam_flag ("v4.0", Opt_v),
220 fsparam_flag ("v4.1", Opt_v),
221 fsparam_flag ("v4.2", Opt_v),
222 fsparam_string("vers", Opt_vers),
223 fsparam_enum ("write", Opt_write, nfs_param_enums_write),
224 fsparam_u32 ("wsize", Opt_wsize),
225 fsparam_string("xprtsec", Opt_xprtsec),
226 fsparam_s32("cert_serial", Opt_cert_serial),
227 fsparam_s32("privkey_serial", Opt_privkey_serial),
228 {}
229};
230
231enum {
232 Opt_vers_2,
233 Opt_vers_3,
234 Opt_vers_4,
235 Opt_vers_4_0,
236 Opt_vers_4_1,
237 Opt_vers_4_2,
238};
239
240static const struct constant_table nfs_vers_tokens[] = {
241 { "2", Opt_vers_2 },
242 { "3", Opt_vers_3 },
243 { "4", Opt_vers_4 },
244 { "4.0", Opt_vers_4_0 },
245 { "4.1", Opt_vers_4_1 },
246 { "4.2", Opt_vers_4_2 },
247 {}
248};
249
250enum {
251 Opt_xprt_rdma,
252 Opt_xprt_rdma6,
253 Opt_xprt_tcp,
254 Opt_xprt_tcp6,
255 Opt_xprt_udp,
256 Opt_xprt_udp6,
257 nr__Opt_xprt
258};
259
260static const struct constant_table nfs_xprt_protocol_tokens[] = {
261 { "rdma", Opt_xprt_rdma },
262 { "rdma6", Opt_xprt_rdma6 },
263 { "tcp", Opt_xprt_tcp },
264 { "tcp6", Opt_xprt_tcp6 },
265 { "udp", Opt_xprt_udp },
266 { "udp6", Opt_xprt_udp6 },
267 {}
268};
269
270enum {
271 Opt_sec_krb5,
272 Opt_sec_krb5i,
273 Opt_sec_krb5p,
274 Opt_sec_lkey,
275 Opt_sec_lkeyi,
276 Opt_sec_lkeyp,
277 Opt_sec_none,
278 Opt_sec_spkm,
279 Opt_sec_spkmi,
280 Opt_sec_spkmp,
281 Opt_sec_sys,
282 nr__Opt_sec
283};
284
285static const struct constant_table nfs_secflavor_tokens[] = {
286 { "krb5", Opt_sec_krb5 },
287 { "krb5i", Opt_sec_krb5i },
288 { "krb5p", Opt_sec_krb5p },
289 { "lkey", Opt_sec_lkey },
290 { "lkeyi", Opt_sec_lkeyi },
291 { "lkeyp", Opt_sec_lkeyp },
292 { "none", Opt_sec_none },
293 { "null", Opt_sec_none },
294 { "spkm3", Opt_sec_spkm },
295 { "spkm3i", Opt_sec_spkmi },
296 { "spkm3p", Opt_sec_spkmp },
297 { "sys", Opt_sec_sys },
298 {}
299};
300
301enum {
302 Opt_xprtsec_none,
303 Opt_xprtsec_tls,
304 Opt_xprtsec_mtls,
305 nr__Opt_xprtsec
306};
307
308static const struct constant_table nfs_xprtsec_policies[] = {
309 { "none", Opt_xprtsec_none },
310 { "tls", Opt_xprtsec_tls },
311 { "mtls", Opt_xprtsec_mtls },
312 {}
313};
314
315static const struct constant_table nfs_rdirplus_tokens[] = {
316 { "none", Opt_rdirplus_none },
317 { "force", Opt_rdirplus_force },
318 {}
319};
320
321/*
322 * Sanity-check a server address provided by the mount command.
323 *
324 * Address family must be initialized, and address must not be
325 * the ANY address for that family.
326 */
327static int nfs_verify_server_address(struct sockaddr_storage *addr)
328{
329 switch (addr->ss_family) {
330 case AF_INET: {
331 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
332 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
333 }
334 case AF_INET6: {
335 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
336 return !ipv6_addr_any(a: sa);
337 }
338 }
339
340 return 0;
341}
342
343#ifdef CONFIG_NFS_DISABLE_UDP_SUPPORT
344static bool nfs_server_transport_udp_invalid(const struct nfs_fs_context *ctx)
345{
346 return true;
347}
348#else
349static bool nfs_server_transport_udp_invalid(const struct nfs_fs_context *ctx)
350{
351 if (ctx->version == 4)
352 return true;
353 return false;
354}
355#endif
356
357/*
358 * Sanity check the NFS transport protocol.
359 */
360static int nfs_validate_transport_protocol(struct fs_context *fc,
361 struct nfs_fs_context *ctx)
362{
363 switch (ctx->nfs_server.protocol) {
364 case XPRT_TRANSPORT_UDP:
365 if (nfs_server_transport_udp_invalid(ctx))
366 goto out_invalid_transport_udp;
367 break;
368 case XPRT_TRANSPORT_TCP:
369 case XPRT_TRANSPORT_RDMA:
370 break;
371 default:
372 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
373 }
374
375 if (ctx->xprtsec.policy != RPC_XPRTSEC_NONE)
376 switch (ctx->nfs_server.protocol) {
377 case XPRT_TRANSPORT_TCP:
378 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP_TLS;
379 break;
380 default:
381 goto out_invalid_xprtsec_policy;
382 }
383
384 return 0;
385out_invalid_transport_udp:
386 return nfs_invalf(fc, "NFS: Unsupported transport protocol udp");
387out_invalid_xprtsec_policy:
388 return nfs_invalf(fc, "NFS: Transport does not support xprtsec");
389}
390
391/*
392 * For text based NFSv2/v3 mounts, the mount protocol transport default
393 * settings should depend upon the specified NFS transport.
394 */
395static void nfs_set_mount_transport_protocol(struct nfs_fs_context *ctx)
396{
397 if (ctx->mount_server.protocol == XPRT_TRANSPORT_UDP ||
398 ctx->mount_server.protocol == XPRT_TRANSPORT_TCP)
399 return;
400 switch (ctx->nfs_server.protocol) {
401 case XPRT_TRANSPORT_UDP:
402 ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
403 break;
404 case XPRT_TRANSPORT_TCP:
405 case XPRT_TRANSPORT_RDMA:
406 ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
407 }
408}
409
410/*
411 * Add 'flavor' to 'auth_info' if not already present.
412 * Returns true if 'flavor' ends up in the list, false otherwise
413 */
414static int nfs_auth_info_add(struct fs_context *fc,
415 struct nfs_auth_info *auth_info,
416 rpc_authflavor_t flavor)
417{
418 unsigned int i;
419 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
420
421 /* make sure this flavor isn't already in the list */
422 for (i = 0; i < auth_info->flavor_len; i++) {
423 if (flavor == auth_info->flavors[i])
424 return 0;
425 }
426
427 if (auth_info->flavor_len + 1 >= max_flavor_len)
428 return nfs_invalf(fc, "NFS: too many sec= flavors");
429
430 auth_info->flavors[auth_info->flavor_len++] = flavor;
431 return 0;
432}
433
434/*
435 * Parse the value of the 'sec=' option.
436 */
437static int nfs_parse_security_flavors(struct fs_context *fc,
438 struct fs_parameter *param)
439{
440 struct nfs_fs_context *ctx = nfs_fc2context(fc);
441 rpc_authflavor_t pseudoflavor;
442 char *string = param->string, *p;
443 int ret;
444
445 trace_nfs_mount_assign(option: param->key, value: string);
446
447 while ((p = strsep(&string, ":")) != NULL) {
448 if (!*p)
449 continue;
450 switch (lookup_constant(tbl: nfs_secflavor_tokens, name: p, not_found: -1)) {
451 case Opt_sec_none:
452 pseudoflavor = RPC_AUTH_NULL;
453 break;
454 case Opt_sec_sys:
455 pseudoflavor = RPC_AUTH_UNIX;
456 break;
457 case Opt_sec_krb5:
458 pseudoflavor = RPC_AUTH_GSS_KRB5;
459 break;
460 case Opt_sec_krb5i:
461 pseudoflavor = RPC_AUTH_GSS_KRB5I;
462 break;
463 case Opt_sec_krb5p:
464 pseudoflavor = RPC_AUTH_GSS_KRB5P;
465 break;
466 case Opt_sec_lkey:
467 pseudoflavor = RPC_AUTH_GSS_LKEY;
468 break;
469 case Opt_sec_lkeyi:
470 pseudoflavor = RPC_AUTH_GSS_LKEYI;
471 break;
472 case Opt_sec_lkeyp:
473 pseudoflavor = RPC_AUTH_GSS_LKEYP;
474 break;
475 case Opt_sec_spkm:
476 pseudoflavor = RPC_AUTH_GSS_SPKM;
477 break;
478 case Opt_sec_spkmi:
479 pseudoflavor = RPC_AUTH_GSS_SPKMI;
480 break;
481 case Opt_sec_spkmp:
482 pseudoflavor = RPC_AUTH_GSS_SPKMP;
483 break;
484 default:
485 return nfs_invalf(fc, "NFS: sec=%s option not recognized", p);
486 }
487
488 ret = nfs_auth_info_add(fc, auth_info: &ctx->auth_info, flavor: pseudoflavor);
489 if (ret < 0)
490 return ret;
491 }
492
493 return 0;
494}
495
496static int nfs_parse_xprtsec_policy(struct fs_context *fc,
497 struct fs_parameter *param)
498{
499 struct nfs_fs_context *ctx = nfs_fc2context(fc);
500
501 trace_nfs_mount_assign(option: param->key, value: param->string);
502
503 switch (lookup_constant(tbl: nfs_xprtsec_policies, name: param->string, not_found: -1)) {
504 case Opt_xprtsec_none:
505 ctx->xprtsec.policy = RPC_XPRTSEC_NONE;
506 break;
507 case Opt_xprtsec_tls:
508 ctx->xprtsec.policy = RPC_XPRTSEC_TLS_ANON;
509 break;
510 case Opt_xprtsec_mtls:
511 ctx->xprtsec.policy = RPC_XPRTSEC_TLS_X509;
512 break;
513 default:
514 return nfs_invalf(fc, "NFS: Unrecognized transport security policy");
515 }
516 return 0;
517}
518
519static int nfs_parse_version_string(struct fs_context *fc,
520 const char *string)
521{
522 struct nfs_fs_context *ctx = nfs_fc2context(fc);
523
524 ctx->flags &= ~NFS_MOUNT_VER3;
525 switch (lookup_constant(tbl: nfs_vers_tokens, name: string, not_found: -1)) {
526 case Opt_vers_2:
527 ctx->version = 2;
528 break;
529 case Opt_vers_3:
530 ctx->flags |= NFS_MOUNT_VER3;
531 ctx->version = 3;
532 break;
533 case Opt_vers_4:
534 /* Backward compatibility option. In future,
535 * the mount program should always supply
536 * a NFSv4 minor version number.
537 */
538 ctx->version = 4;
539 break;
540 case Opt_vers_4_0:
541 ctx->version = 4;
542 ctx->minorversion = 0;
543 break;
544 case Opt_vers_4_1:
545 ctx->version = 4;
546 ctx->minorversion = 1;
547 break;
548 case Opt_vers_4_2:
549 ctx->version = 4;
550 ctx->minorversion = 2;
551 break;
552 default:
553 return nfs_invalf(fc, "NFS: Unsupported NFS version");
554 }
555 return 0;
556}
557
558#ifdef CONFIG_KEYS
559static int nfs_tls_key_verify(key_serial_t key_id)
560{
561 struct key *key = key_lookup(id: key_id);
562 int error = 0;
563
564 if (IS_ERR(ptr: key)) {
565 pr_err("key id %08x not found\n", key_id);
566 return PTR_ERR(ptr: key);
567 }
568 if (test_bit(KEY_FLAG_REVOKED, &key->flags) ||
569 test_bit(KEY_FLAG_INVALIDATED, &key->flags)) {
570 pr_err("key id %08x revoked\n", key_id);
571 error = -EKEYREVOKED;
572 }
573
574 key_put(key);
575 return error;
576}
577#else
578static inline int nfs_tls_key_verify(key_serial_t key_id)
579{
580 return -ENOENT;
581}
582#endif /* CONFIG_KEYS */
583
584/*
585 * Parse a single mount parameter.
586 */
587static int nfs_fs_context_parse_param(struct fs_context *fc,
588 struct fs_parameter *param)
589{
590 struct fs_parse_result result;
591 struct nfs_fs_context *ctx = nfs_fc2context(fc);
592 unsigned short protofamily, mountfamily;
593 unsigned int len;
594 int ret, opt;
595
596 trace_nfs_mount_option(param);
597
598 opt = fs_parse(fc, desc: nfs_fs_parameters, param, result: &result);
599 if (opt < 0)
600 return (opt == -ENOPARAM && ctx->sloppy) ? 1 : opt;
601
602 if (fc->security)
603 ctx->has_sec_mnt_opts = 1;
604
605 switch (opt) {
606 case Opt_source:
607 if (fc->source)
608 return nfs_invalf(fc, "NFS: Multiple sources not supported");
609 fc->source = param->string;
610 param->string = NULL;
611 break;
612
613 /*
614 * boolean options: foo/nofoo
615 */
616 case Opt_soft:
617 ctx->flags |= NFS_MOUNT_SOFT;
618 ctx->flags &= ~NFS_MOUNT_SOFTERR;
619 break;
620 case Opt_softerr:
621 ctx->flags |= NFS_MOUNT_SOFTERR | NFS_MOUNT_SOFTREVAL;
622 ctx->flags &= ~NFS_MOUNT_SOFT;
623 break;
624 case Opt_hard:
625 ctx->flags &= ~(NFS_MOUNT_SOFT |
626 NFS_MOUNT_SOFTERR |
627 NFS_MOUNT_SOFTREVAL);
628 break;
629 case Opt_softreval:
630 if (result.negated)
631 ctx->flags &= ~NFS_MOUNT_SOFTREVAL;
632 else
633 ctx->flags |= NFS_MOUNT_SOFTREVAL;
634 break;
635 case Opt_posix:
636 if (result.negated)
637 ctx->flags &= ~NFS_MOUNT_POSIX;
638 else
639 ctx->flags |= NFS_MOUNT_POSIX;
640 break;
641 case Opt_cto:
642 if (result.negated)
643 ctx->flags |= NFS_MOUNT_NOCTO;
644 else
645 ctx->flags &= ~NFS_MOUNT_NOCTO;
646 break;
647 case Opt_trunkdiscovery:
648 if (result.negated)
649 ctx->flags &= ~NFS_MOUNT_TRUNK_DISCOVERY;
650 else
651 ctx->flags |= NFS_MOUNT_TRUNK_DISCOVERY;
652 break;
653 case Opt_alignwrite:
654 if (result.negated)
655 ctx->flags |= NFS_MOUNT_NO_ALIGNWRITE;
656 else
657 ctx->flags &= ~NFS_MOUNT_NO_ALIGNWRITE;
658 break;
659 case Opt_ac:
660 if (result.negated)
661 ctx->flags |= NFS_MOUNT_NOAC;
662 else
663 ctx->flags &= ~NFS_MOUNT_NOAC;
664 break;
665 case Opt_lock:
666 if (result.negated) {
667 ctx->lock_status = NFS_LOCK_NOLOCK;
668 ctx->flags |= NFS_MOUNT_NONLM;
669 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
670 } else {
671 ctx->lock_status = NFS_LOCK_LOCK;
672 ctx->flags &= ~NFS_MOUNT_NONLM;
673 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
674 }
675 break;
676 case Opt_udp:
677 ctx->flags &= ~NFS_MOUNT_TCP;
678 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
679 break;
680 case Opt_tcp:
681 case Opt_rdma:
682 ctx->flags |= NFS_MOUNT_TCP; /* for side protocols */
683 ret = xprt_find_transport_ident(param->key);
684 if (ret < 0)
685 goto out_bad_transport;
686 ctx->nfs_server.protocol = ret;
687 break;
688 case Opt_acl:
689 if (result.negated)
690 ctx->flags |= NFS_MOUNT_NOACL;
691 else
692 ctx->flags &= ~NFS_MOUNT_NOACL;
693 break;
694 case Opt_rdirplus:
695 if (result.negated) {
696 ctx->flags &= ~NFS_MOUNT_FORCE_RDIRPLUS;
697 ctx->flags |= NFS_MOUNT_NORDIRPLUS;
698 } else if (!param->string) {
699 ctx->flags &= ~(NFS_MOUNT_NORDIRPLUS | NFS_MOUNT_FORCE_RDIRPLUS);
700 } else {
701 switch (lookup_constant(tbl: nfs_rdirplus_tokens, name: param->string, not_found: -1)) {
702 case Opt_rdirplus_none:
703 ctx->flags &= ~NFS_MOUNT_FORCE_RDIRPLUS;
704 ctx->flags |= NFS_MOUNT_NORDIRPLUS;
705 break;
706 case Opt_rdirplus_force:
707 ctx->flags &= ~NFS_MOUNT_NORDIRPLUS;
708 ctx->flags |= NFS_MOUNT_FORCE_RDIRPLUS;
709 break;
710 default:
711 goto out_invalid_value;
712 }
713 }
714 break;
715 case Opt_sharecache:
716 if (result.negated)
717 ctx->flags |= NFS_MOUNT_UNSHARED;
718 else
719 ctx->flags &= ~NFS_MOUNT_UNSHARED;
720 break;
721 case Opt_resvport:
722 if (result.negated)
723 ctx->flags |= NFS_MOUNT_NORESVPORT;
724 else
725 ctx->flags &= ~NFS_MOUNT_NORESVPORT;
726 break;
727 case Opt_fscache_flag:
728 if (result.negated)
729 ctx->options &= ~NFS_OPTION_FSCACHE;
730 else
731 ctx->options |= NFS_OPTION_FSCACHE;
732 kfree(objp: ctx->fscache_uniq);
733 ctx->fscache_uniq = NULL;
734 break;
735 case Opt_fscache:
736 trace_nfs_mount_assign(option: param->key, value: param->string);
737 ctx->options |= NFS_OPTION_FSCACHE;
738 kfree(objp: ctx->fscache_uniq);
739 ctx->fscache_uniq = param->string;
740 param->string = NULL;
741 break;
742 case Opt_migration:
743 if (result.negated)
744 ctx->options &= ~NFS_OPTION_MIGRATION;
745 else
746 ctx->options |= NFS_OPTION_MIGRATION;
747 break;
748
749 /*
750 * options that take numeric values
751 */
752 case Opt_port:
753 if (result.uint_32 > USHRT_MAX)
754 goto out_of_bounds;
755 ctx->nfs_server.port = result.uint_32;
756 break;
757 case Opt_rsize:
758 ctx->rsize = result.uint_32;
759 break;
760 case Opt_wsize:
761 ctx->wsize = result.uint_32;
762 break;
763 case Opt_bsize:
764 ctx->bsize = result.uint_32;
765 break;
766 case Opt_timeo:
767 if (result.uint_32 < 1 || result.uint_32 > INT_MAX)
768 goto out_of_bounds;
769 ctx->timeo = result.uint_32;
770 break;
771 case Opt_retrans:
772 if (result.uint_32 > INT_MAX)
773 goto out_of_bounds;
774 ctx->retrans = result.uint_32;
775 break;
776 case Opt_acregmin:
777 ctx->acregmin = result.uint_32;
778 break;
779 case Opt_acregmax:
780 ctx->acregmax = result.uint_32;
781 break;
782 case Opt_acdirmin:
783 ctx->acdirmin = result.uint_32;
784 break;
785 case Opt_acdirmax:
786 ctx->acdirmax = result.uint_32;
787 break;
788 case Opt_actimeo:
789 ctx->acregmin = result.uint_32;
790 ctx->acregmax = result.uint_32;
791 ctx->acdirmin = result.uint_32;
792 ctx->acdirmax = result.uint_32;
793 break;
794 case Opt_namelen:
795 ctx->namlen = result.uint_32;
796 break;
797 case Opt_mountport:
798 if (result.uint_32 > USHRT_MAX)
799 goto out_of_bounds;
800 ctx->mount_server.port = result.uint_32;
801 break;
802 case Opt_mountvers:
803 if (result.uint_32 < NFS_MNT_VERSION ||
804 result.uint_32 > NFS_MNT3_VERSION)
805 goto out_of_bounds;
806 ctx->mount_server.version = result.uint_32;
807 break;
808 case Opt_minorversion:
809 if (result.uint_32 > NFS4_MAX_MINOR_VERSION)
810 goto out_of_bounds;
811 ctx->minorversion = result.uint_32;
812 break;
813
814 /*
815 * options that take text values
816 */
817 case Opt_v:
818 ret = nfs_parse_version_string(fc, string: param->key + 1);
819 if (ret < 0)
820 return ret;
821 break;
822 case Opt_vers:
823 if (!param->string)
824 goto out_invalid_value;
825 trace_nfs_mount_assign(option: param->key, value: param->string);
826 ret = nfs_parse_version_string(fc, string: param->string);
827 if (ret < 0)
828 return ret;
829 break;
830 case Opt_sec:
831 ret = nfs_parse_security_flavors(fc, param);
832 if (ret < 0)
833 return ret;
834 break;
835 case Opt_xprtsec:
836 ret = nfs_parse_xprtsec_policy(fc, param);
837 if (ret < 0)
838 return ret;
839 break;
840 case Opt_cert_serial:
841 ret = nfs_tls_key_verify(key_id: result.int_32);
842 if (ret < 0)
843 return ret;
844 ctx->xprtsec.cert_serial = result.int_32;
845 break;
846 case Opt_privkey_serial:
847 ret = nfs_tls_key_verify(key_id: result.int_32);
848 if (ret < 0)
849 return ret;
850 ctx->xprtsec.privkey_serial = result.int_32;
851 break;
852
853 case Opt_proto:
854 if (!param->string)
855 goto out_invalid_value;
856 trace_nfs_mount_assign(option: param->key, value: param->string);
857 protofamily = AF_INET;
858 switch (lookup_constant(tbl: nfs_xprt_protocol_tokens, name: param->string, not_found: -1)) {
859 case Opt_xprt_udp6:
860 protofamily = AF_INET6;
861 fallthrough;
862 case Opt_xprt_udp:
863 ctx->flags &= ~NFS_MOUNT_TCP;
864 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
865 break;
866 case Opt_xprt_tcp6:
867 protofamily = AF_INET6;
868 fallthrough;
869 case Opt_xprt_tcp:
870 ctx->flags |= NFS_MOUNT_TCP;
871 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
872 break;
873 case Opt_xprt_rdma6:
874 protofamily = AF_INET6;
875 fallthrough;
876 case Opt_xprt_rdma:
877 /* vector side protocols to TCP */
878 ctx->flags |= NFS_MOUNT_TCP;
879 ret = xprt_find_transport_ident(param->string);
880 if (ret < 0)
881 goto out_bad_transport;
882 ctx->nfs_server.protocol = ret;
883 break;
884 default:
885 goto out_bad_transport;
886 }
887
888 ctx->protofamily = protofamily;
889 break;
890
891 case Opt_mountproto:
892 if (!param->string)
893 goto out_invalid_value;
894 trace_nfs_mount_assign(option: param->key, value: param->string);
895 mountfamily = AF_INET;
896 switch (lookup_constant(tbl: nfs_xprt_protocol_tokens, name: param->string, not_found: -1)) {
897 case Opt_xprt_udp6:
898 mountfamily = AF_INET6;
899 fallthrough;
900 case Opt_xprt_udp:
901 ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
902 break;
903 case Opt_xprt_tcp6:
904 mountfamily = AF_INET6;
905 fallthrough;
906 case Opt_xprt_tcp:
907 ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
908 break;
909 case Opt_xprt_rdma: /* not used for side protocols */
910 default:
911 goto out_bad_transport;
912 }
913 ctx->mountfamily = mountfamily;
914 break;
915
916 case Opt_addr:
917 trace_nfs_mount_assign(option: param->key, value: param->string);
918 len = rpc_pton(fc->net_ns, param->string, param->size,
919 &ctx->nfs_server.address,
920 sizeof(ctx->nfs_server._address));
921 if (len == 0)
922 goto out_invalid_address;
923 ctx->nfs_server.addrlen = len;
924 break;
925 case Opt_clientaddr:
926 trace_nfs_mount_assign(option: param->key, value: param->string);
927 kfree(objp: ctx->client_address);
928 ctx->client_address = param->string;
929 param->string = NULL;
930 break;
931 case Opt_mounthost:
932 trace_nfs_mount_assign(option: param->key, value: param->string);
933 kfree(objp: ctx->mount_server.hostname);
934 ctx->mount_server.hostname = param->string;
935 param->string = NULL;
936 break;
937 case Opt_mountaddr:
938 trace_nfs_mount_assign(option: param->key, value: param->string);
939 len = rpc_pton(fc->net_ns, param->string, param->size,
940 &ctx->mount_server.address,
941 sizeof(ctx->mount_server._address));
942 if (len == 0)
943 goto out_invalid_address;
944 ctx->mount_server.addrlen = len;
945 break;
946 case Opt_nconnect:
947 trace_nfs_mount_assign(option: param->key, value: param->string);
948 if (result.uint_32 < 1 || result.uint_32 > NFS_MAX_CONNECTIONS)
949 goto out_of_bounds;
950 ctx->nfs_server.nconnect = result.uint_32;
951 break;
952 case Opt_max_connect:
953 trace_nfs_mount_assign(option: param->key, value: param->string);
954 if (result.uint_32 < 1 || result.uint_32 > NFS_MAX_TRANSPORTS)
955 goto out_of_bounds;
956 ctx->nfs_server.max_connect = result.uint_32;
957 break;
958 case Opt_fatal_neterrors:
959 trace_nfs_mount_assign(option: param->key, value: param->string);
960 switch (result.uint_32) {
961 case Opt_fatal_neterrors_default:
962 if (fc->net_ns != &init_net)
963 ctx->flags |= NFS_MOUNT_NETUNREACH_FATAL;
964 else
965 ctx->flags &= ~NFS_MOUNT_NETUNREACH_FATAL;
966 break;
967 case Opt_fatal_neterrors_enetunreach:
968 ctx->flags |= NFS_MOUNT_NETUNREACH_FATAL;
969 break;
970 case Opt_fatal_neterrors_none:
971 ctx->flags &= ~NFS_MOUNT_NETUNREACH_FATAL;
972 break;
973 default:
974 goto out_invalid_value;
975 }
976 break;
977 case Opt_lookupcache:
978 trace_nfs_mount_assign(option: param->key, value: param->string);
979 switch (result.uint_32) {
980 case Opt_lookupcache_all:
981 ctx->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
982 break;
983 case Opt_lookupcache_positive:
984 ctx->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
985 ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
986 break;
987 case Opt_lookupcache_none:
988 ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
989 break;
990 default:
991 goto out_invalid_value;
992 }
993 break;
994 case Opt_local_lock:
995 trace_nfs_mount_assign(option: param->key, value: param->string);
996 switch (result.uint_32) {
997 case Opt_local_lock_all:
998 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK |
999 NFS_MOUNT_LOCAL_FCNTL);
1000 break;
1001 case Opt_local_lock_flock:
1002 ctx->flags |= NFS_MOUNT_LOCAL_FLOCK;
1003 break;
1004 case Opt_local_lock_posix:
1005 ctx->flags |= NFS_MOUNT_LOCAL_FCNTL;
1006 break;
1007 case Opt_local_lock_none:
1008 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1009 NFS_MOUNT_LOCAL_FCNTL);
1010 break;
1011 default:
1012 goto out_invalid_value;
1013 }
1014 break;
1015 case Opt_write:
1016 trace_nfs_mount_assign(option: param->key, value: param->string);
1017 switch (result.uint_32) {
1018 case Opt_write_lazy:
1019 ctx->flags &=
1020 ~(NFS_MOUNT_WRITE_EAGER | NFS_MOUNT_WRITE_WAIT);
1021 break;
1022 case Opt_write_eager:
1023 ctx->flags |= NFS_MOUNT_WRITE_EAGER;
1024 ctx->flags &= ~NFS_MOUNT_WRITE_WAIT;
1025 break;
1026 case Opt_write_wait:
1027 ctx->flags |=
1028 NFS_MOUNT_WRITE_EAGER | NFS_MOUNT_WRITE_WAIT;
1029 break;
1030 default:
1031 goto out_invalid_value;
1032 }
1033 break;
1034
1035 /*
1036 * Special options
1037 */
1038 case Opt_sloppy:
1039 ctx->sloppy = true;
1040 break;
1041 }
1042
1043 return 0;
1044
1045out_invalid_value:
1046 return nfs_invalf(fc, "NFS: Bad mount option value specified");
1047out_invalid_address:
1048 return nfs_invalf(fc, "NFS: Bad IP address specified");
1049out_of_bounds:
1050 return nfs_invalf(fc, "NFS: Value for '%s' out of range", param->key);
1051out_bad_transport:
1052 return nfs_invalf(fc, "NFS: Unrecognized transport protocol");
1053}
1054
1055/*
1056 * Split fc->source into "hostname:export_path".
1057 *
1058 * The leftmost colon demarks the split between the server's hostname
1059 * and the export path. If the hostname starts with a left square
1060 * bracket, then it may contain colons.
1061 *
1062 * Note: caller frees hostname and export path, even on error.
1063 */
1064static int nfs_parse_source(struct fs_context *fc,
1065 size_t maxnamlen, size_t maxpathlen)
1066{
1067 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1068 const char *dev_name = fc->source;
1069 size_t len;
1070 const char *end;
1071
1072 if (unlikely(!dev_name || !*dev_name))
1073 return -EINVAL;
1074
1075 /* Is the host name protected with square brakcets? */
1076 if (*dev_name == '[') {
1077 end = strchr(++dev_name, ']');
1078 if (end == NULL || end[1] != ':')
1079 goto out_bad_devname;
1080
1081 len = end - dev_name;
1082 end++;
1083 } else {
1084 const char *comma;
1085
1086 end = strchr(dev_name, ':');
1087 if (end == NULL)
1088 goto out_bad_devname;
1089 len = end - dev_name;
1090
1091 /* kill possible hostname list: not supported */
1092 comma = memchr(p: dev_name, c: ',', size: len);
1093 if (comma)
1094 len = comma - dev_name;
1095 }
1096
1097 if (len > maxnamlen)
1098 goto out_hostname;
1099
1100 kfree(objp: ctx->nfs_server.hostname);
1101
1102 /* N.B. caller will free nfs_server.hostname in all cases */
1103 ctx->nfs_server.hostname = kmemdup_nul(s: dev_name, len, GFP_KERNEL);
1104 if (!ctx->nfs_server.hostname)
1105 goto out_nomem;
1106 len = strlen(++end);
1107 if (len > maxpathlen)
1108 goto out_path;
1109 ctx->nfs_server.export_path = kmemdup_nul(s: end, len, GFP_KERNEL);
1110 if (!ctx->nfs_server.export_path)
1111 goto out_nomem;
1112
1113 trace_nfs_mount_path(path: ctx->nfs_server.export_path);
1114 return 0;
1115
1116out_bad_devname:
1117 return nfs_invalf(fc, "NFS: device name not in host:path format");
1118out_nomem:
1119 nfs_errorf(fc, "NFS: not enough memory to parse device name");
1120 return -ENOMEM;
1121out_hostname:
1122 nfs_errorf(fc, "NFS: server hostname too long");
1123 return -ENAMETOOLONG;
1124out_path:
1125 nfs_errorf(fc, "NFS: export pathname too long");
1126 return -ENAMETOOLONG;
1127}
1128
1129static inline bool is_remount_fc(struct fs_context *fc)
1130{
1131 return fc->root != NULL;
1132}
1133
1134/*
1135 * Parse monolithic NFS2/NFS3 mount data
1136 * - fills in the mount root filehandle
1137 *
1138 * For option strings, user space handles the following behaviors:
1139 *
1140 * + DNS: mapping server host name to IP address ("addr=" option)
1141 *
1142 * + failure mode: how to behave if a mount request can't be handled
1143 * immediately ("fg/bg" option)
1144 *
1145 * + retry: how often to retry a mount request ("retry=" option)
1146 *
1147 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1148 * mountproto=tcp after mountproto=udp, and so on
1149 */
1150static int nfs23_parse_monolithic(struct fs_context *fc,
1151 struct nfs_mount_data *data)
1152{
1153 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1154 struct nfs_fh *mntfh = ctx->mntfh;
1155 struct sockaddr_storage *sap = &ctx->nfs_server._address;
1156 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
1157 int ret;
1158
1159 if (data == NULL)
1160 goto out_no_data;
1161
1162 ctx->version = NFS_DEFAULT_VERSION;
1163 switch (data->version) {
1164 case 1:
1165 data->namlen = 0;
1166 fallthrough;
1167 case 2:
1168 data->bsize = 0;
1169 fallthrough;
1170 case 3:
1171 if (data->flags & NFS_MOUNT_VER3)
1172 goto out_no_v3;
1173 data->root.size = NFS2_FHSIZE;
1174 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1175 /* Turn off security negotiation */
1176 extra_flags |= NFS_MOUNT_SECFLAVOUR;
1177 fallthrough;
1178 case 4:
1179 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1180 goto out_no_sec;
1181 fallthrough;
1182 case 5:
1183 memset(data->context, 0, sizeof(data->context));
1184 fallthrough;
1185 case 6:
1186 if (data->flags & NFS_MOUNT_VER3) {
1187 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1188 goto out_invalid_fh;
1189 mntfh->size = data->root.size;
1190 ctx->version = 3;
1191 } else {
1192 mntfh->size = NFS2_FHSIZE;
1193 ctx->version = 2;
1194 }
1195
1196
1197 memcpy(mntfh->data, data->root.data, mntfh->size);
1198 if (mntfh->size < sizeof(mntfh->data))
1199 memset(mntfh->data + mntfh->size, 0,
1200 sizeof(mntfh->data) - mntfh->size);
1201
1202 /*
1203 * for proto == XPRT_TRANSPORT_UDP, which is what uses
1204 * to_exponential, implying shift: limit the shift value
1205 * to BITS_PER_LONG (majortimeo is unsigned long)
1206 */
1207 if (!(data->flags & NFS_MOUNT_TCP)) /* this will be UDP */
1208 if (data->retrans >= 64) /* shift value is too large */
1209 goto out_invalid_data;
1210
1211 /*
1212 * Translate to nfs_fs_context, which nfs_fill_super
1213 * can deal with.
1214 */
1215 ctx->flags = data->flags & NFS_MOUNT_FLAGMASK;
1216 ctx->flags |= extra_flags;
1217 ctx->rsize = data->rsize;
1218 ctx->wsize = data->wsize;
1219 ctx->timeo = data->timeo;
1220 ctx->retrans = data->retrans;
1221 ctx->acregmin = data->acregmin;
1222 ctx->acregmax = data->acregmax;
1223 ctx->acdirmin = data->acdirmin;
1224 ctx->acdirmax = data->acdirmax;
1225 ctx->need_mount = false;
1226
1227 if (!is_remount_fc(fc)) {
1228 memcpy(sap, &data->addr, sizeof(data->addr));
1229 ctx->nfs_server.addrlen = sizeof(data->addr);
1230 ctx->nfs_server.port = ntohs(data->addr.sin_port);
1231 }
1232
1233 if (sap->ss_family != AF_INET ||
1234 !nfs_verify_server_address(addr: sap))
1235 goto out_no_address;
1236
1237 if (!(data->flags & NFS_MOUNT_TCP))
1238 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1239 /* N.B. caller will free nfs_server.hostname in all cases */
1240 ctx->nfs_server.hostname = kstrdup(s: data->hostname, GFP_KERNEL);
1241 if (!ctx->nfs_server.hostname)
1242 goto out_nomem;
1243
1244 ctx->namlen = data->namlen;
1245 ctx->bsize = data->bsize;
1246
1247 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1248 ctx->selected_flavor = data->pseudoflavor;
1249 else
1250 ctx->selected_flavor = RPC_AUTH_UNIX;
1251
1252 if (!(data->flags & NFS_MOUNT_NONLM))
1253 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1254 NFS_MOUNT_LOCAL_FCNTL);
1255 else
1256 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1257 NFS_MOUNT_LOCAL_FCNTL);
1258
1259 /*
1260 * The legacy version 6 binary mount data from userspace has a
1261 * field used only to transport selinux information into the
1262 * kernel. To continue to support that functionality we
1263 * have a touch of selinux knowledge here in the NFS code. The
1264 * userspace code converted context=blah to just blah so we are
1265 * converting back to the full string selinux understands.
1266 */
1267 if (data->context[0]){
1268#ifdef CONFIG_SECURITY_SELINUX
1269 int ret;
1270
1271 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1272 ret = vfs_parse_fs_string(fc, key: "context", value: data->context);
1273 if (ret < 0)
1274 return ret;
1275#else
1276 return -EINVAL;
1277#endif
1278 }
1279
1280 break;
1281 default:
1282 goto generic;
1283 }
1284
1285 ret = nfs_validate_transport_protocol(fc, ctx);
1286 if (ret)
1287 return ret;
1288
1289 ctx->skip_reconfig_option_check = true;
1290 return 0;
1291
1292generic:
1293 return generic_parse_monolithic(fc, data);
1294
1295out_no_data:
1296 if (is_remount_fc(fc)) {
1297 ctx->skip_reconfig_option_check = true;
1298 return 0;
1299 }
1300 return nfs_invalf(fc, "NFS: mount program didn't pass any mount data");
1301
1302out_no_v3:
1303 return nfs_invalf(fc, "NFS: nfs_mount_data version does not support v3");
1304
1305out_no_sec:
1306 return nfs_invalf(fc, "NFS: nfs_mount_data version supports only AUTH_SYS");
1307
1308out_nomem:
1309 return -ENOMEM;
1310
1311out_no_address:
1312 return nfs_invalf(fc, "NFS: mount program didn't pass remote address");
1313
1314out_invalid_fh:
1315 return nfs_invalf(fc, "NFS: invalid root filehandle");
1316
1317out_invalid_data:
1318 return nfs_invalf(fc, "NFS: invalid binary mount data");
1319}
1320
1321#if IS_ENABLED(CONFIG_NFS_V4)
1322struct compat_nfs_string {
1323 compat_uint_t len;
1324 compat_uptr_t data;
1325};
1326
1327static inline void compat_nfs_string(struct nfs_string *dst,
1328 struct compat_nfs_string *src)
1329{
1330 dst->data = compat_ptr(uptr: src->data);
1331 dst->len = src->len;
1332}
1333
1334struct compat_nfs4_mount_data_v1 {
1335 compat_int_t version;
1336 compat_int_t flags;
1337 compat_int_t rsize;
1338 compat_int_t wsize;
1339 compat_int_t timeo;
1340 compat_int_t retrans;
1341 compat_int_t acregmin;
1342 compat_int_t acregmax;
1343 compat_int_t acdirmin;
1344 compat_int_t acdirmax;
1345 struct compat_nfs_string client_addr;
1346 struct compat_nfs_string mnt_path;
1347 struct compat_nfs_string hostname;
1348 compat_uint_t host_addrlen;
1349 compat_uptr_t host_addr;
1350 compat_int_t proto;
1351 compat_int_t auth_flavourlen;
1352 compat_uptr_t auth_flavours;
1353};
1354
1355static void nfs4_compat_mount_data_conv(struct nfs4_mount_data *data)
1356{
1357 struct compat_nfs4_mount_data_v1 *compat =
1358 (struct compat_nfs4_mount_data_v1 *)data;
1359
1360 /* copy the fields backwards */
1361 data->auth_flavours = compat_ptr(uptr: compat->auth_flavours);
1362 data->auth_flavourlen = compat->auth_flavourlen;
1363 data->proto = compat->proto;
1364 data->host_addr = compat_ptr(uptr: compat->host_addr);
1365 data->host_addrlen = compat->host_addrlen;
1366 compat_nfs_string(dst: &data->hostname, src: &compat->hostname);
1367 compat_nfs_string(dst: &data->mnt_path, src: &compat->mnt_path);
1368 compat_nfs_string(dst: &data->client_addr, src: &compat->client_addr);
1369 data->acdirmax = compat->acdirmax;
1370 data->acdirmin = compat->acdirmin;
1371 data->acregmax = compat->acregmax;
1372 data->acregmin = compat->acregmin;
1373 data->retrans = compat->retrans;
1374 data->timeo = compat->timeo;
1375 data->wsize = compat->wsize;
1376 data->rsize = compat->rsize;
1377 data->flags = compat->flags;
1378 data->version = compat->version;
1379}
1380
1381/*
1382 * Validate NFSv4 mount options
1383 */
1384static int nfs4_parse_monolithic(struct fs_context *fc,
1385 struct nfs4_mount_data *data)
1386{
1387 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1388 struct sockaddr_storage *sap = &ctx->nfs_server._address;
1389 int ret;
1390 char *c;
1391
1392 if (!data) {
1393 if (is_remount_fc(fc))
1394 goto done;
1395 return nfs_invalf(fc,
1396 "NFS4: mount program didn't pass any mount data");
1397 }
1398
1399 ctx->version = 4;
1400
1401 if (data->version != 1)
1402 return generic_parse_monolithic(fc, data);
1403
1404 if (in_compat_syscall())
1405 nfs4_compat_mount_data_conv(data);
1406
1407 if (data->host_addrlen > sizeof(ctx->nfs_server.address))
1408 goto out_no_address;
1409 if (data->host_addrlen == 0)
1410 goto out_no_address;
1411 ctx->nfs_server.addrlen = data->host_addrlen;
1412 if (copy_from_user(to: sap, from: data->host_addr, n: data->host_addrlen))
1413 return -EFAULT;
1414 if (!nfs_verify_server_address(addr: sap))
1415 goto out_no_address;
1416 ctx->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
1417
1418 if (data->auth_flavourlen) {
1419 rpc_authflavor_t pseudoflavor;
1420
1421 if (data->auth_flavourlen > 1)
1422 goto out_inval_auth;
1423 if (copy_from_user(to: &pseudoflavor, from: data->auth_flavours,
1424 n: sizeof(pseudoflavor)))
1425 return -EFAULT;
1426 ctx->selected_flavor = pseudoflavor;
1427 } else {
1428 ctx->selected_flavor = RPC_AUTH_UNIX;
1429 }
1430
1431 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1432 if (IS_ERR(ptr: c))
1433 return PTR_ERR(ptr: c);
1434 ctx->nfs_server.hostname = c;
1435
1436 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1437 if (IS_ERR(ptr: c))
1438 return PTR_ERR(ptr: c);
1439 ctx->nfs_server.export_path = c;
1440 trace_nfs_mount_path(path: c);
1441
1442 c = strndup_user(data->client_addr.data, 16);
1443 if (IS_ERR(ptr: c))
1444 return PTR_ERR(ptr: c);
1445 ctx->client_address = c;
1446
1447 /*
1448 * Translate to nfs_fs_context, which nfs_fill_super
1449 * can deal with.
1450 */
1451
1452 ctx->flags = data->flags & NFS4_MOUNT_FLAGMASK;
1453 ctx->rsize = data->rsize;
1454 ctx->wsize = data->wsize;
1455 ctx->timeo = data->timeo;
1456 ctx->retrans = data->retrans;
1457 ctx->acregmin = data->acregmin;
1458 ctx->acregmax = data->acregmax;
1459 ctx->acdirmin = data->acdirmin;
1460 ctx->acdirmax = data->acdirmax;
1461 ctx->nfs_server.protocol = data->proto;
1462 ret = nfs_validate_transport_protocol(fc, ctx);
1463 if (ret)
1464 return ret;
1465done:
1466 ctx->skip_reconfig_option_check = true;
1467 return 0;
1468
1469out_inval_auth:
1470 return nfs_invalf(fc, "NFS4: Invalid number of RPC auth flavours %d",
1471 data->auth_flavourlen);
1472
1473out_no_address:
1474 return nfs_invalf(fc, "NFS4: mount program didn't pass remote address");
1475}
1476#endif
1477
1478/*
1479 * Parse a monolithic block of data from sys_mount().
1480 */
1481static int nfs_fs_context_parse_monolithic(struct fs_context *fc,
1482 void *data)
1483{
1484 if (fc->fs_type == &nfs_fs_type)
1485 return nfs23_parse_monolithic(fc, data);
1486
1487#if IS_ENABLED(CONFIG_NFS_V4)
1488 if (fc->fs_type == &nfs4_fs_type)
1489 return nfs4_parse_monolithic(fc, data);
1490#endif
1491
1492 return nfs_invalf(fc, "NFS: Unsupported monolithic data version");
1493}
1494
1495/*
1496 * Validate the preparsed information in the config.
1497 */
1498static int nfs_fs_context_validate(struct fs_context *fc)
1499{
1500 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1501 struct nfs_subversion *nfs_mod;
1502 struct sockaddr_storage *sap = &ctx->nfs_server._address;
1503 int max_namelen = PAGE_SIZE;
1504 int max_pathlen = NFS_MAXPATHLEN;
1505 int port = 0;
1506 int ret;
1507
1508 if (!fc->source)
1509 goto out_no_device_name;
1510
1511 /* Check for sanity first. */
1512 if (ctx->minorversion && ctx->version != 4)
1513 goto out_minorversion_mismatch;
1514
1515 if (ctx->options & NFS_OPTION_MIGRATION &&
1516 (ctx->version != 4 || ctx->minorversion != 0))
1517 goto out_migration_misuse;
1518
1519 /* Verify that any proto=/mountproto= options match the address
1520 * families in the addr=/mountaddr= options.
1521 */
1522 if (ctx->protofamily != AF_UNSPEC &&
1523 ctx->protofamily != ctx->nfs_server.address.sa_family)
1524 goto out_proto_mismatch;
1525
1526 if (ctx->mountfamily != AF_UNSPEC) {
1527 if (ctx->mount_server.addrlen) {
1528 if (ctx->mountfamily != ctx->mount_server.address.sa_family)
1529 goto out_mountproto_mismatch;
1530 } else {
1531 if (ctx->mountfamily != ctx->nfs_server.address.sa_family)
1532 goto out_mountproto_mismatch;
1533 }
1534 }
1535
1536 if (!nfs_verify_server_address(addr: sap))
1537 goto out_no_address;
1538
1539 ret = nfs_validate_transport_protocol(fc, ctx);
1540 if (ret)
1541 return ret;
1542
1543 if (ctx->version == 4) {
1544 if (IS_ENABLED(CONFIG_NFS_V4)) {
1545 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
1546 port = NFS_RDMA_PORT;
1547 else
1548 port = NFS_PORT;
1549 max_namelen = NFS4_MAXNAMLEN;
1550 max_pathlen = NFS4_MAXPATHLEN;
1551 ctx->flags &= ~(NFS_MOUNT_NONLM | NFS_MOUNT_NOACL |
1552 NFS_MOUNT_VER3 | NFS_MOUNT_LOCAL_FLOCK |
1553 NFS_MOUNT_LOCAL_FCNTL);
1554 } else {
1555 goto out_v4_not_compiled;
1556 }
1557 } else {
1558 nfs_set_mount_transport_protocol(ctx);
1559 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
1560 port = NFS_RDMA_PORT;
1561 }
1562
1563 nfs_set_port(sap, port: &ctx->nfs_server.port, default_port: port);
1564
1565 ret = nfs_parse_source(fc, maxnamlen: max_namelen, maxpathlen: max_pathlen);
1566 if (ret < 0)
1567 return ret;
1568
1569 /* Load the NFS protocol module if we haven't done so yet */
1570 if (!ctx->nfs_mod) {
1571 nfs_mod = find_nfs_version(ctx->version);
1572 if (IS_ERR(ptr: nfs_mod)) {
1573 ret = PTR_ERR(ptr: nfs_mod);
1574 goto out_version_unavailable;
1575 }
1576 ctx->nfs_mod = nfs_mod;
1577 }
1578
1579 /* Ensure the filesystem context has the correct fs_type */
1580 if (fc->fs_type != ctx->nfs_mod->nfs_fs) {
1581 module_put(module: fc->fs_type->owner);
1582 __module_get(module: ctx->nfs_mod->nfs_fs->owner);
1583 fc->fs_type = ctx->nfs_mod->nfs_fs;
1584 }
1585 return 0;
1586
1587out_no_device_name:
1588 return nfs_invalf(fc, "NFS: Device name not specified");
1589out_v4_not_compiled:
1590 nfs_errorf(fc, "NFS: NFSv4 is not compiled into kernel");
1591 return -EPROTONOSUPPORT;
1592out_no_address:
1593 return nfs_invalf(fc, "NFS: mount program didn't pass remote address");
1594out_mountproto_mismatch:
1595 return nfs_invalf(fc, "NFS: Mount server address does not match mountproto= option");
1596out_proto_mismatch:
1597 return nfs_invalf(fc, "NFS: Server address does not match proto= option");
1598out_minorversion_mismatch:
1599 return nfs_invalf(fc, "NFS: Mount option vers=%u does not support minorversion=%u",
1600 ctx->version, ctx->minorversion);
1601out_migration_misuse:
1602 return nfs_invalf(fc, "NFS: 'Migration' not supported for this NFS version");
1603out_version_unavailable:
1604 nfs_errorf(fc, "NFS: Version unavailable");
1605 return ret;
1606}
1607
1608/*
1609 * Create an NFS superblock by the appropriate method.
1610 */
1611static int nfs_get_tree(struct fs_context *fc)
1612{
1613 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1614 int err = nfs_fs_context_validate(fc);
1615
1616 if (err)
1617 return err;
1618 if (!ctx->internal)
1619 return ctx->nfs_mod->rpc_ops->try_get_tree(fc);
1620 else
1621 return nfs_get_tree_common(fc);
1622}
1623
1624/*
1625 * Handle duplication of a configuration. The caller copied *src into *sc, but
1626 * it can't deal with resource pointers in the filesystem context, so we have
1627 * to do that. We need to clear pointers, copy data or get extra refs as
1628 * appropriate.
1629 */
1630static int nfs_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)
1631{
1632 struct nfs_fs_context *src = nfs_fc2context(fc: src_fc), *ctx;
1633
1634 ctx = kmemdup(src, sizeof(struct nfs_fs_context), GFP_KERNEL);
1635 if (!ctx)
1636 return -ENOMEM;
1637
1638 ctx->mntfh = nfs_alloc_fhandle();
1639 if (!ctx->mntfh) {
1640 kfree(objp: ctx);
1641 return -ENOMEM;
1642 }
1643 nfs_copy_fh(target: ctx->mntfh, source: src->mntfh);
1644
1645 get_nfs_version(ctx->nfs_mod);
1646 ctx->client_address = NULL;
1647 ctx->mount_server.hostname = NULL;
1648 ctx->nfs_server.export_path = NULL;
1649 ctx->nfs_server.hostname = NULL;
1650 ctx->fscache_uniq = NULL;
1651 ctx->clone_data.fattr = NULL;
1652 fc->fs_private = ctx;
1653 return 0;
1654}
1655
1656static void nfs_fs_context_free(struct fs_context *fc)
1657{
1658 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1659
1660 if (ctx) {
1661 if (ctx->server)
1662 nfs_free_server(server: ctx->server);
1663 if (ctx->nfs_mod)
1664 put_nfs_version(ctx->nfs_mod);
1665 kfree(objp: ctx->client_address);
1666 kfree(objp: ctx->mount_server.hostname);
1667 kfree(objp: ctx->nfs_server.export_path);
1668 kfree(objp: ctx->nfs_server.hostname);
1669 kfree(objp: ctx->fscache_uniq);
1670 nfs_free_fhandle(fh: ctx->mntfh);
1671 nfs_free_fattr(fattr: ctx->clone_data.fattr);
1672 kfree(objp: ctx);
1673 }
1674}
1675
1676static const struct fs_context_operations nfs_fs_context_ops = {
1677 .free = nfs_fs_context_free,
1678 .dup = nfs_fs_context_dup,
1679 .parse_param = nfs_fs_context_parse_param,
1680 .parse_monolithic = nfs_fs_context_parse_monolithic,
1681 .get_tree = nfs_get_tree,
1682 .reconfigure = nfs_reconfigure,
1683};
1684
1685/*
1686 * Prepare superblock configuration. We use the namespaces attached to the
1687 * context. This may be the current process's namespaces, or it may be a
1688 * container's namespaces.
1689 */
1690static int nfs_init_fs_context(struct fs_context *fc)
1691{
1692 struct nfs_fs_context *ctx;
1693
1694 ctx = kzalloc(sizeof(struct nfs_fs_context), GFP_KERNEL);
1695 if (unlikely(!ctx))
1696 return -ENOMEM;
1697
1698 ctx->mntfh = nfs_alloc_fhandle();
1699 if (unlikely(!ctx->mntfh)) {
1700 kfree(objp: ctx);
1701 return -ENOMEM;
1702 }
1703
1704 ctx->protofamily = AF_UNSPEC;
1705 ctx->mountfamily = AF_UNSPEC;
1706 ctx->mount_server.port = NFS_UNSPEC_PORT;
1707
1708 if (fc->root) {
1709 /* reconfigure, start with the current config */
1710 struct nfs_server *nfss = fc->root->d_sb->s_fs_info;
1711 struct net *net = nfss->nfs_client->cl_net;
1712
1713 ctx->flags = nfss->flags;
1714 ctx->rsize = nfss->rsize;
1715 ctx->wsize = nfss->wsize;
1716 ctx->retrans = nfss->client->cl_timeout->to_retries;
1717 ctx->selected_flavor = nfss->client->cl_auth->au_flavor;
1718 ctx->acregmin = nfss->acregmin / HZ;
1719 ctx->acregmax = nfss->acregmax / HZ;
1720 ctx->acdirmin = nfss->acdirmin / HZ;
1721 ctx->acdirmax = nfss->acdirmax / HZ;
1722 ctx->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1723 ctx->nfs_server.port = nfss->port;
1724 ctx->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1725 ctx->version = nfss->nfs_client->rpc_ops->version;
1726 ctx->minorversion = nfss->nfs_client->cl_minorversion;
1727
1728 memcpy(&ctx->nfs_server._address, &nfss->nfs_client->cl_addr,
1729 ctx->nfs_server.addrlen);
1730
1731 if (fc->net_ns != net) {
1732 put_net(net: fc->net_ns);
1733 fc->net_ns = get_net(net);
1734 }
1735
1736 ctx->nfs_mod = nfss->nfs_client->cl_nfs_mod;
1737 get_nfs_version(ctx->nfs_mod);
1738 } else {
1739 /* defaults */
1740 ctx->timeo = NFS_UNSPEC_TIMEO;
1741 ctx->retrans = NFS_UNSPEC_RETRANS;
1742 ctx->acregmin = NFS_DEF_ACREGMIN;
1743 ctx->acregmax = NFS_DEF_ACREGMAX;
1744 ctx->acdirmin = NFS_DEF_ACDIRMIN;
1745 ctx->acdirmax = NFS_DEF_ACDIRMAX;
1746 ctx->nfs_server.port = NFS_UNSPEC_PORT;
1747 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1748 ctx->selected_flavor = RPC_AUTH_MAXFLAVOR;
1749 ctx->minorversion = 0;
1750 ctx->need_mount = true;
1751 ctx->xprtsec.policy = RPC_XPRTSEC_NONE;
1752 ctx->xprtsec.cert_serial = TLS_NO_CERT;
1753 ctx->xprtsec.privkey_serial = TLS_NO_PRIVKEY;
1754
1755 if (fc->net_ns != &init_net)
1756 ctx->flags |= NFS_MOUNT_NETUNREACH_FATAL;
1757
1758 fc->s_iflags |= SB_I_STABLE_WRITES;
1759 }
1760 fc->fs_private = ctx;
1761 fc->ops = &nfs_fs_context_ops;
1762 return 0;
1763}
1764
1765struct file_system_type nfs_fs_type = {
1766 .owner = THIS_MODULE,
1767 .name = "nfs",
1768 .init_fs_context = nfs_init_fs_context,
1769 .parameters = nfs_fs_parameters,
1770 .kill_sb = nfs_kill_super,
1771 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
1772};
1773MODULE_ALIAS_FS("nfs");
1774EXPORT_SYMBOL_GPL(nfs_fs_type);
1775
1776#if IS_ENABLED(CONFIG_NFS_V4)
1777struct file_system_type nfs4_fs_type = {
1778 .owner = THIS_MODULE,
1779 .name = "nfs4",
1780 .init_fs_context = nfs_init_fs_context,
1781 .parameters = nfs_fs_parameters,
1782 .kill_sb = nfs_kill_super,
1783 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
1784};
1785MODULE_ALIAS_FS("nfs4");
1786MODULE_ALIAS("nfs4");
1787EXPORT_SYMBOL_GPL(nfs4_fs_type);
1788#endif /* CONFIG_NFS_V4 */
1789

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