1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/fs/nfs/fs_context.c
5 * Copyright (C) 1992 Rick Sladkey
6 * Conversion to new mount api Copyright (C) David Howells
10 * Split from fs/nfs/super.c by David Howells <dhowells@redhat.com>
13 #include <linux/module.h>
15 #include <linux/fs_context.h>
16 #include <linux/fs_parser.h>
17 #include <linux/nfs_fs.h>
18 #include <linux/nfs_mount.h>
19 #include <linux/nfs4_mount.h>
23 #define NFSDBG_FACILITY NFSDBG_MOUNT
25 #if IS_ENABLED(CONFIG_NFS_V3)
26 #define NFS_DEFAULT_VERSION 3
28 #define NFS_DEFAULT_VERSION 2
31 #define NFS_MAX_CONNECTIONS 16
95 static const struct constant_table nfs_param_enums_local_lock[] = {
96 { "all", Opt_local_lock_all },
97 { "flock", Opt_local_lock_flock },
98 { "posix", Opt_local_lock_posix },
99 { "none", Opt_local_lock_none },
105 Opt_lookupcache_none,
106 Opt_lookupcache_positive,
109 static const struct constant_table nfs_param_enums_lookupcache[] = {
110 { "all", Opt_lookupcache_all },
111 { "none", Opt_lookupcache_none },
112 { "pos", Opt_lookupcache_positive },
113 { "positive", Opt_lookupcache_positive },
123 static const struct constant_table nfs_param_enums_write[] = {
124 { "lazy", Opt_write_lazy },
125 { "eager", Opt_write_eager },
126 { "wait", Opt_write_wait },
130 static const struct fs_parameter_spec nfs_fs_parameters[] = {
131 fsparam_flag_no("ac", Opt_ac),
132 fsparam_u32 ("acdirmax", Opt_acdirmax),
133 fsparam_u32 ("acdirmin", Opt_acdirmin),
134 fsparam_flag_no("acl", Opt_acl),
135 fsparam_u32 ("acregmax", Opt_acregmax),
136 fsparam_u32 ("acregmin", Opt_acregmin),
137 fsparam_u32 ("actimeo", Opt_actimeo),
138 fsparam_string("addr", Opt_addr),
139 fsparam_flag ("bg", Opt_bg),
140 fsparam_u32 ("bsize", Opt_bsize),
141 fsparam_string("clientaddr", Opt_clientaddr),
142 fsparam_flag_no("cto", Opt_cto),
143 fsparam_flag ("fg", Opt_fg),
144 fsparam_flag_no("fsc", Opt_fscache_flag),
145 fsparam_string("fsc", Opt_fscache),
146 fsparam_flag ("hard", Opt_hard),
147 __fsparam(NULL, "intr", Opt_intr,
148 fs_param_neg_with_no|fs_param_deprecated, NULL),
149 fsparam_enum ("local_lock", Opt_local_lock, nfs_param_enums_local_lock),
150 fsparam_flag_no("lock", Opt_lock),
151 fsparam_enum ("lookupcache", Opt_lookupcache, nfs_param_enums_lookupcache),
152 fsparam_flag_no("migration", Opt_migration),
153 fsparam_u32 ("minorversion", Opt_minorversion),
154 fsparam_string("mountaddr", Opt_mountaddr),
155 fsparam_string("mounthost", Opt_mounthost),
156 fsparam_u32 ("mountport", Opt_mountport),
157 fsparam_string("mountproto", Opt_mountproto),
158 fsparam_u32 ("mountvers", Opt_mountvers),
159 fsparam_u32 ("namlen", Opt_namelen),
160 fsparam_u32 ("nconnect", Opt_nconnect),
161 fsparam_string("nfsvers", Opt_vers),
162 fsparam_u32 ("port", Opt_port),
163 fsparam_flag_no("posix", Opt_posix),
164 fsparam_string("proto", Opt_proto),
165 fsparam_flag_no("rdirplus", Opt_rdirplus),
166 fsparam_flag ("rdma", Opt_rdma),
167 fsparam_flag_no("resvport", Opt_resvport),
168 fsparam_u32 ("retrans", Opt_retrans),
169 fsparam_string("retry", Opt_retry),
170 fsparam_u32 ("rsize", Opt_rsize),
171 fsparam_string("sec", Opt_sec),
172 fsparam_flag_no("sharecache", Opt_sharecache),
173 fsparam_flag ("sloppy", Opt_sloppy),
174 fsparam_flag ("soft", Opt_soft),
175 fsparam_flag ("softerr", Opt_softerr),
176 fsparam_flag ("softreval", Opt_softreval),
177 fsparam_string("source", Opt_source),
178 fsparam_flag ("tcp", Opt_tcp),
179 fsparam_u32 ("timeo", Opt_timeo),
180 fsparam_flag ("udp", Opt_udp),
181 fsparam_flag ("v2", Opt_v),
182 fsparam_flag ("v3", Opt_v),
183 fsparam_flag ("v4", Opt_v),
184 fsparam_flag ("v4.0", Opt_v),
185 fsparam_flag ("v4.1", Opt_v),
186 fsparam_flag ("v4.2", Opt_v),
187 fsparam_string("vers", Opt_vers),
188 fsparam_enum ("write", Opt_write, nfs_param_enums_write),
189 fsparam_u32 ("wsize", Opt_wsize),
202 static const struct constant_table nfs_vers_tokens[] = {
206 { "4.0", Opt_vers_4_0 },
207 { "4.1", Opt_vers_4_1 },
208 { "4.2", Opt_vers_4_2 },
222 static const struct constant_table nfs_xprt_protocol_tokens[] = {
223 { "rdma", Opt_xprt_rdma },
224 { "rdma6", Opt_xprt_rdma6 },
225 { "tcp", Opt_xprt_tcp },
226 { "tcp6", Opt_xprt_tcp6 },
227 { "udp", Opt_xprt_udp },
228 { "udp6", Opt_xprt_udp6 },
247 static const struct constant_table nfs_secflavor_tokens[] = {
248 { "krb5", Opt_sec_krb5 },
249 { "krb5i", Opt_sec_krb5i },
250 { "krb5p", Opt_sec_krb5p },
251 { "lkey", Opt_sec_lkey },
252 { "lkeyi", Opt_sec_lkeyi },
253 { "lkeyp", Opt_sec_lkeyp },
254 { "none", Opt_sec_none },
255 { "null", Opt_sec_none },
256 { "spkm3", Opt_sec_spkm },
257 { "spkm3i", Opt_sec_spkmi },
258 { "spkm3p", Opt_sec_spkmp },
259 { "sys", Opt_sec_sys },
264 * Sanity-check a server address provided by the mount command.
266 * Address family must be initialized, and address must not be
267 * the ANY address for that family.
269 static int nfs_verify_server_address(struct sockaddr *addr)
271 switch (addr->sa_family) {
273 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
274 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
277 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
278 return !ipv6_addr_any(sa);
282 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
287 * Sanity check the NFS transport protocol.
290 static void nfs_validate_transport_protocol(struct nfs_fs_context *ctx)
292 switch (ctx->nfs_server.protocol) {
293 case XPRT_TRANSPORT_UDP:
294 case XPRT_TRANSPORT_TCP:
295 case XPRT_TRANSPORT_RDMA:
298 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
303 * For text based NFSv2/v3 mounts, the mount protocol transport default
304 * settings should depend upon the specified NFS transport.
306 static void nfs_set_mount_transport_protocol(struct nfs_fs_context *ctx)
308 nfs_validate_transport_protocol(ctx);
310 if (ctx->mount_server.protocol == XPRT_TRANSPORT_UDP ||
311 ctx->mount_server.protocol == XPRT_TRANSPORT_TCP)
313 switch (ctx->nfs_server.protocol) {
314 case XPRT_TRANSPORT_UDP:
315 ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
317 case XPRT_TRANSPORT_TCP:
318 case XPRT_TRANSPORT_RDMA:
319 ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
324 * Add 'flavor' to 'auth_info' if not already present.
325 * Returns true if 'flavor' ends up in the list, false otherwise
327 static int nfs_auth_info_add(struct fs_context *fc,
328 struct nfs_auth_info *auth_info,
329 rpc_authflavor_t flavor)
332 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
334 /* make sure this flavor isn't already in the list */
335 for (i = 0; i < auth_info->flavor_len; i++) {
336 if (flavor == auth_info->flavors[i])
340 if (auth_info->flavor_len + 1 >= max_flavor_len)
341 return nfs_invalf(fc, "NFS: too many sec= flavors");
343 auth_info->flavors[auth_info->flavor_len++] = flavor;
348 * Parse the value of the 'sec=' option.
350 static int nfs_parse_security_flavors(struct fs_context *fc,
351 struct fs_parameter *param)
353 struct nfs_fs_context *ctx = nfs_fc2context(fc);
354 rpc_authflavor_t pseudoflavor;
355 char *string = param->string, *p;
358 dfprintk(MOUNT, "NFS: parsing %s=%s option\n", param->key, param->string);
360 while ((p = strsep(&string, ":")) != NULL) {
363 switch (lookup_constant(nfs_secflavor_tokens, p, -1)) {
365 pseudoflavor = RPC_AUTH_NULL;
368 pseudoflavor = RPC_AUTH_UNIX;
371 pseudoflavor = RPC_AUTH_GSS_KRB5;
374 pseudoflavor = RPC_AUTH_GSS_KRB5I;
377 pseudoflavor = RPC_AUTH_GSS_KRB5P;
380 pseudoflavor = RPC_AUTH_GSS_LKEY;
383 pseudoflavor = RPC_AUTH_GSS_LKEYI;
386 pseudoflavor = RPC_AUTH_GSS_LKEYP;
389 pseudoflavor = RPC_AUTH_GSS_SPKM;
392 pseudoflavor = RPC_AUTH_GSS_SPKMI;
395 pseudoflavor = RPC_AUTH_GSS_SPKMP;
398 return nfs_invalf(fc, "NFS: sec=%s option not recognized", p);
401 ret = nfs_auth_info_add(fc, &ctx->auth_info, pseudoflavor);
409 static int nfs_parse_version_string(struct fs_context *fc,
412 struct nfs_fs_context *ctx = nfs_fc2context(fc);
414 ctx->flags &= ~NFS_MOUNT_VER3;
415 switch (lookup_constant(nfs_vers_tokens, string, -1)) {
420 ctx->flags |= NFS_MOUNT_VER3;
424 /* Backward compatibility option. In future,
425 * the mount program should always supply
426 * a NFSv4 minor version number.
432 ctx->minorversion = 0;
436 ctx->minorversion = 1;
440 ctx->minorversion = 2;
443 return nfs_invalf(fc, "NFS: Unsupported NFS version");
449 * Parse a single mount parameter.
451 static int nfs_fs_context_parse_param(struct fs_context *fc,
452 struct fs_parameter *param)
454 struct fs_parse_result result;
455 struct nfs_fs_context *ctx = nfs_fc2context(fc);
456 unsigned short protofamily, mountfamily;
460 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", param->key);
462 opt = fs_parse(fc, nfs_fs_parameters, param, &result);
464 return ctx->sloppy ? 1 : opt;
467 ctx->has_sec_mnt_opts = 1;
472 return nfs_invalf(fc, "NFS: Multiple sources not supported");
473 fc->source = param->string;
474 param->string = NULL;
478 * boolean options: foo/nofoo
481 ctx->flags |= NFS_MOUNT_SOFT;
482 ctx->flags &= ~NFS_MOUNT_SOFTERR;
485 ctx->flags |= NFS_MOUNT_SOFTERR | NFS_MOUNT_SOFTREVAL;
486 ctx->flags &= ~NFS_MOUNT_SOFT;
489 ctx->flags &= ~(NFS_MOUNT_SOFT |
491 NFS_MOUNT_SOFTREVAL);
495 ctx->flags &= ~NFS_MOUNT_SOFTREVAL;
497 ctx->flags &= NFS_MOUNT_SOFTREVAL;
501 ctx->flags &= ~NFS_MOUNT_POSIX;
503 ctx->flags |= NFS_MOUNT_POSIX;
507 ctx->flags |= NFS_MOUNT_NOCTO;
509 ctx->flags &= ~NFS_MOUNT_NOCTO;
513 ctx->flags |= NFS_MOUNT_NOAC;
515 ctx->flags &= ~NFS_MOUNT_NOAC;
518 if (result.negated) {
519 ctx->flags |= NFS_MOUNT_NONLM;
520 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
522 ctx->flags &= ~NFS_MOUNT_NONLM;
523 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
527 ctx->flags &= ~NFS_MOUNT_TCP;
528 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
532 ctx->flags |= NFS_MOUNT_TCP; /* for side protocols */
533 ret = xprt_find_transport_ident(param->key);
535 goto out_bad_transport;
536 ctx->nfs_server.protocol = ret;
540 ctx->flags |= NFS_MOUNT_NOACL;
542 ctx->flags &= ~NFS_MOUNT_NOACL;
546 ctx->flags |= NFS_MOUNT_NORDIRPLUS;
548 ctx->flags &= ~NFS_MOUNT_NORDIRPLUS;
552 ctx->flags |= NFS_MOUNT_UNSHARED;
554 ctx->flags &= ~NFS_MOUNT_UNSHARED;
558 ctx->flags |= NFS_MOUNT_NORESVPORT;
560 ctx->flags &= ~NFS_MOUNT_NORESVPORT;
562 case Opt_fscache_flag:
564 ctx->options &= ~NFS_OPTION_FSCACHE;
566 ctx->options |= NFS_OPTION_FSCACHE;
567 kfree(ctx->fscache_uniq);
568 ctx->fscache_uniq = NULL;
571 ctx->options |= NFS_OPTION_FSCACHE;
572 kfree(ctx->fscache_uniq);
573 ctx->fscache_uniq = param->string;
574 param->string = NULL;
578 ctx->options &= ~NFS_OPTION_MIGRATION;
580 ctx->options |= NFS_OPTION_MIGRATION;
584 * options that take numeric values
587 if (result.uint_32 > USHRT_MAX)
589 ctx->nfs_server.port = result.uint_32;
592 ctx->rsize = result.uint_32;
595 ctx->wsize = result.uint_32;
598 ctx->bsize = result.uint_32;
601 if (result.uint_32 < 1 || result.uint_32 > INT_MAX)
603 ctx->timeo = result.uint_32;
606 if (result.uint_32 > INT_MAX)
608 ctx->retrans = result.uint_32;
611 ctx->acregmin = result.uint_32;
614 ctx->acregmax = result.uint_32;
617 ctx->acdirmin = result.uint_32;
620 ctx->acdirmax = result.uint_32;
623 ctx->acregmin = result.uint_32;
624 ctx->acregmax = result.uint_32;
625 ctx->acdirmin = result.uint_32;
626 ctx->acdirmax = result.uint_32;
629 ctx->namlen = result.uint_32;
632 if (result.uint_32 > USHRT_MAX)
634 ctx->mount_server.port = result.uint_32;
637 if (result.uint_32 < NFS_MNT_VERSION ||
638 result.uint_32 > NFS_MNT3_VERSION)
640 ctx->mount_server.version = result.uint_32;
642 case Opt_minorversion:
643 if (result.uint_32 > NFS4_MAX_MINOR_VERSION)
645 ctx->minorversion = result.uint_32;
649 * options that take text values
652 ret = nfs_parse_version_string(fc, param->key + 1);
657 ret = nfs_parse_version_string(fc, param->string);
662 ret = nfs_parse_security_flavors(fc, param);
668 protofamily = AF_INET;
669 switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
671 protofamily = AF_INET6;
674 ctx->flags &= ~NFS_MOUNT_TCP;
675 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
678 protofamily = AF_INET6;
681 ctx->flags |= NFS_MOUNT_TCP;
682 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
685 protofamily = AF_INET6;
688 /* vector side protocols to TCP */
689 ctx->flags |= NFS_MOUNT_TCP;
690 ret = xprt_find_transport_ident(param->string);
692 goto out_bad_transport;
693 ctx->nfs_server.protocol = ret;
696 goto out_bad_transport;
699 ctx->protofamily = protofamily;
703 mountfamily = AF_INET;
704 switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
706 mountfamily = AF_INET6;
709 ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
712 mountfamily = AF_INET6;
715 ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
717 case Opt_xprt_rdma: /* not used for side protocols */
719 goto out_bad_transport;
721 ctx->mountfamily = mountfamily;
725 len = rpc_pton(fc->net_ns, param->string, param->size,
726 &ctx->nfs_server.address,
727 sizeof(ctx->nfs_server._address));
729 goto out_invalid_address;
730 ctx->nfs_server.addrlen = len;
733 kfree(ctx->client_address);
734 ctx->client_address = param->string;
735 param->string = NULL;
738 kfree(ctx->mount_server.hostname);
739 ctx->mount_server.hostname = param->string;
740 param->string = NULL;
743 len = rpc_pton(fc->net_ns, param->string, param->size,
744 &ctx->mount_server.address,
745 sizeof(ctx->mount_server._address));
747 goto out_invalid_address;
748 ctx->mount_server.addrlen = len;
751 if (result.uint_32 < 1 || result.uint_32 > NFS_MAX_CONNECTIONS)
753 ctx->nfs_server.nconnect = result.uint_32;
755 case Opt_lookupcache:
756 switch (result.uint_32) {
757 case Opt_lookupcache_all:
758 ctx->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
760 case Opt_lookupcache_positive:
761 ctx->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
762 ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
764 case Opt_lookupcache_none:
765 ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
768 goto out_invalid_value;
772 switch (result.uint_32) {
773 case Opt_local_lock_all:
774 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK |
775 NFS_MOUNT_LOCAL_FCNTL);
777 case Opt_local_lock_flock:
778 ctx->flags |= NFS_MOUNT_LOCAL_FLOCK;
780 case Opt_local_lock_posix:
781 ctx->flags |= NFS_MOUNT_LOCAL_FCNTL;
783 case Opt_local_lock_none:
784 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
785 NFS_MOUNT_LOCAL_FCNTL);
788 goto out_invalid_value;
792 switch (result.uint_32) {
795 ~(NFS_MOUNT_WRITE_EAGER | NFS_MOUNT_WRITE_WAIT);
797 case Opt_write_eager:
798 ctx->flags |= NFS_MOUNT_WRITE_EAGER;
799 ctx->flags &= ~NFS_MOUNT_WRITE_WAIT;
803 NFS_MOUNT_WRITE_EAGER | NFS_MOUNT_WRITE_WAIT;
806 goto out_invalid_value;
815 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
822 return nfs_invalf(fc, "NFS: Bad mount option value specified");
824 return nfs_invalf(fc, "NFS: Bad IP address specified");
826 return nfs_invalf(fc, "NFS: Value for '%s' out of range", param->key);
828 return nfs_invalf(fc, "NFS: Unrecognized transport protocol");
832 * Split fc->source into "hostname:export_path".
834 * The leftmost colon demarks the split between the server's hostname
835 * and the export path. If the hostname starts with a left square
836 * bracket, then it may contain colons.
838 * Note: caller frees hostname and export path, even on error.
840 static int nfs_parse_source(struct fs_context *fc,
841 size_t maxnamlen, size_t maxpathlen)
843 struct nfs_fs_context *ctx = nfs_fc2context(fc);
844 const char *dev_name = fc->source;
848 if (unlikely(!dev_name || !*dev_name)) {
849 dfprintk(MOUNT, "NFS: device name not specified\n");
853 /* Is the host name protected with square brakcets? */
854 if (*dev_name == '[') {
855 end = strchr(++dev_name, ']');
856 if (end == NULL || end[1] != ':')
857 goto out_bad_devname;
859 len = end - dev_name;
864 end = strchr(dev_name, ':');
866 goto out_bad_devname;
867 len = end - dev_name;
869 /* kill possible hostname list: not supported */
870 comma = memchr(dev_name, ',', len);
872 len = comma - dev_name;
878 kfree(ctx->nfs_server.hostname);
880 /* N.B. caller will free nfs_server.hostname in all cases */
881 ctx->nfs_server.hostname = kmemdup_nul(dev_name, len, GFP_KERNEL);
882 if (!ctx->nfs_server.hostname)
885 if (len > maxpathlen)
887 ctx->nfs_server.export_path = kmemdup_nul(end, len, GFP_KERNEL);
888 if (!ctx->nfs_server.export_path)
891 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", ctx->nfs_server.export_path);
895 return nfs_invalf(fc, "NFS: device name not in host:path format");
897 nfs_errorf(fc, "NFS: not enough memory to parse device name");
900 nfs_errorf(fc, "NFS: server hostname too long");
901 return -ENAMETOOLONG;
903 nfs_errorf(fc, "NFS: export pathname too long");
904 return -ENAMETOOLONG;
907 static inline bool is_remount_fc(struct fs_context *fc)
909 return fc->root != NULL;
913 * Parse monolithic NFS2/NFS3 mount data
914 * - fills in the mount root filehandle
916 * For option strings, user space handles the following behaviors:
918 * + DNS: mapping server host name to IP address ("addr=" option)
920 * + failure mode: how to behave if a mount request can't be handled
921 * immediately ("fg/bg" option)
923 * + retry: how often to retry a mount request ("retry=" option)
925 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
926 * mountproto=tcp after mountproto=udp, and so on
928 static int nfs23_parse_monolithic(struct fs_context *fc,
929 struct nfs_mount_data *data)
931 struct nfs_fs_context *ctx = nfs_fc2context(fc);
932 struct nfs_fh *mntfh = ctx->mntfh;
933 struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
934 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
939 ctx->version = NFS_DEFAULT_VERSION;
940 switch (data->version) {
948 if (data->flags & NFS_MOUNT_VER3)
950 data->root.size = NFS2_FHSIZE;
951 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
952 /* Turn off security negotiation */
953 extra_flags |= NFS_MOUNT_SECFLAVOUR;
956 if (data->flags & NFS_MOUNT_SECFLAVOUR)
960 memset(data->context, 0, sizeof(data->context));
963 if (data->flags & NFS_MOUNT_VER3) {
964 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
966 mntfh->size = data->root.size;
969 mntfh->size = NFS2_FHSIZE;
974 memcpy(mntfh->data, data->root.data, mntfh->size);
975 if (mntfh->size < sizeof(mntfh->data))
976 memset(mntfh->data + mntfh->size, 0,
977 sizeof(mntfh->data) - mntfh->size);
980 * Translate to nfs_fs_context, which nfs_fill_super
983 ctx->flags = data->flags & NFS_MOUNT_FLAGMASK;
984 ctx->flags |= extra_flags;
985 ctx->rsize = data->rsize;
986 ctx->wsize = data->wsize;
987 ctx->timeo = data->timeo;
988 ctx->retrans = data->retrans;
989 ctx->acregmin = data->acregmin;
990 ctx->acregmax = data->acregmax;
991 ctx->acdirmin = data->acdirmin;
992 ctx->acdirmax = data->acdirmax;
993 ctx->need_mount = false;
995 memcpy(sap, &data->addr, sizeof(data->addr));
996 ctx->nfs_server.addrlen = sizeof(data->addr);
997 ctx->nfs_server.port = ntohs(data->addr.sin_port);
998 if (sap->sa_family != AF_INET ||
999 !nfs_verify_server_address(sap))
1000 goto out_no_address;
1002 if (!(data->flags & NFS_MOUNT_TCP))
1003 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1004 /* N.B. caller will free nfs_server.hostname in all cases */
1005 ctx->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1006 if (!ctx->nfs_server.hostname)
1009 ctx->namlen = data->namlen;
1010 ctx->bsize = data->bsize;
1012 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1013 ctx->selected_flavor = data->pseudoflavor;
1015 ctx->selected_flavor = RPC_AUTH_UNIX;
1017 if (!(data->flags & NFS_MOUNT_NONLM))
1018 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1019 NFS_MOUNT_LOCAL_FCNTL);
1021 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1022 NFS_MOUNT_LOCAL_FCNTL);
1025 * The legacy version 6 binary mount data from userspace has a
1026 * field used only to transport selinux information into the
1027 * kernel. To continue to support that functionality we
1028 * have a touch of selinux knowledge here in the NFS code. The
1029 * userspace code converted context=blah to just blah so we are
1030 * converting back to the full string selinux understands.
1032 if (data->context[0]){
1033 #ifdef CONFIG_SECURITY_SELINUX
1036 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1037 ret = vfs_parse_fs_string(fc, "context",
1038 data->context, strlen(data->context));
1051 ctx->skip_reconfig_option_check = true;
1055 return generic_parse_monolithic(fc, data);
1058 if (is_remount_fc(fc)) {
1059 ctx->skip_reconfig_option_check = true;
1062 return nfs_invalf(fc, "NFS: mount program didn't pass any mount data");
1065 return nfs_invalf(fc, "NFS: nfs_mount_data version does not support v3");
1068 return nfs_invalf(fc, "NFS: nfs_mount_data version supports only AUTH_SYS");
1071 dfprintk(MOUNT, "NFS: not enough memory to handle mount options");
1075 return nfs_invalf(fc, "NFS: mount program didn't pass remote address");
1078 return nfs_invalf(fc, "NFS: invalid root filehandle");
1081 #if IS_ENABLED(CONFIG_NFS_V4)
1082 struct compat_nfs_string {
1087 static inline void compat_nfs_string(struct nfs_string *dst,
1088 struct compat_nfs_string *src)
1090 dst->data = compat_ptr(src->data);
1091 dst->len = src->len;
1094 struct compat_nfs4_mount_data_v1 {
1095 compat_int_t version;
1100 compat_int_t retrans;
1101 compat_int_t acregmin;
1102 compat_int_t acregmax;
1103 compat_int_t acdirmin;
1104 compat_int_t acdirmax;
1105 struct compat_nfs_string client_addr;
1106 struct compat_nfs_string mnt_path;
1107 struct compat_nfs_string hostname;
1108 compat_uint_t host_addrlen;
1109 compat_uptr_t host_addr;
1111 compat_int_t auth_flavourlen;
1112 compat_uptr_t auth_flavours;
1115 static void nfs4_compat_mount_data_conv(struct nfs4_mount_data *data)
1117 struct compat_nfs4_mount_data_v1 *compat =
1118 (struct compat_nfs4_mount_data_v1 *)data;
1120 /* copy the fields backwards */
1121 data->auth_flavours = compat_ptr(compat->auth_flavours);
1122 data->auth_flavourlen = compat->auth_flavourlen;
1123 data->proto = compat->proto;
1124 data->host_addr = compat_ptr(compat->host_addr);
1125 data->host_addrlen = compat->host_addrlen;
1126 compat_nfs_string(&data->hostname, &compat->hostname);
1127 compat_nfs_string(&data->mnt_path, &compat->mnt_path);
1128 compat_nfs_string(&data->client_addr, &compat->client_addr);
1129 data->acdirmax = compat->acdirmax;
1130 data->acdirmin = compat->acdirmin;
1131 data->acregmax = compat->acregmax;
1132 data->acregmin = compat->acregmin;
1133 data->retrans = compat->retrans;
1134 data->timeo = compat->timeo;
1135 data->wsize = compat->wsize;
1136 data->rsize = compat->rsize;
1137 data->flags = compat->flags;
1138 data->version = compat->version;
1142 * Validate NFSv4 mount options
1144 static int nfs4_parse_monolithic(struct fs_context *fc,
1145 struct nfs4_mount_data *data)
1147 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1148 struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
1152 if (is_remount_fc(fc))
1154 return nfs_invalf(fc,
1155 "NFS4: mount program didn't pass any mount data");
1160 if (data->version != 1)
1161 return generic_parse_monolithic(fc, data);
1163 if (in_compat_syscall())
1164 nfs4_compat_mount_data_conv(data);
1166 if (data->host_addrlen > sizeof(ctx->nfs_server.address))
1167 goto out_no_address;
1168 if (data->host_addrlen == 0)
1169 goto out_no_address;
1170 ctx->nfs_server.addrlen = data->host_addrlen;
1171 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
1173 if (!nfs_verify_server_address(sap))
1174 goto out_no_address;
1175 ctx->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
1177 if (data->auth_flavourlen) {
1178 rpc_authflavor_t pseudoflavor;
1180 if (data->auth_flavourlen > 1)
1181 goto out_inval_auth;
1182 if (copy_from_user(&pseudoflavor, data->auth_flavours,
1183 sizeof(pseudoflavor)))
1185 ctx->selected_flavor = pseudoflavor;
1187 ctx->selected_flavor = RPC_AUTH_UNIX;
1190 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1193 ctx->nfs_server.hostname = c;
1195 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1198 ctx->nfs_server.export_path = c;
1199 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1201 c = strndup_user(data->client_addr.data, 16);
1204 ctx->client_address = c;
1207 * Translate to nfs_fs_context, which nfs_fill_super
1211 ctx->flags = data->flags & NFS4_MOUNT_FLAGMASK;
1212 ctx->rsize = data->rsize;
1213 ctx->wsize = data->wsize;
1214 ctx->timeo = data->timeo;
1215 ctx->retrans = data->retrans;
1216 ctx->acregmin = data->acregmin;
1217 ctx->acregmax = data->acregmax;
1218 ctx->acdirmin = data->acdirmin;
1219 ctx->acdirmax = data->acdirmax;
1220 ctx->nfs_server.protocol = data->proto;
1221 nfs_validate_transport_protocol(ctx);
1222 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
1223 goto out_invalid_transport_udp;
1225 ctx->skip_reconfig_option_check = true;
1229 return nfs_invalf(fc, "NFS4: Invalid number of RPC auth flavours %d",
1230 data->auth_flavourlen);
1233 return nfs_invalf(fc, "NFS4: mount program didn't pass remote address");
1235 out_invalid_transport_udp:
1236 return nfs_invalf(fc, "NFS: Unsupported transport protocol udp");
1241 * Parse a monolithic block of data from sys_mount().
1243 static int nfs_fs_context_parse_monolithic(struct fs_context *fc,
1246 if (fc->fs_type == &nfs_fs_type)
1247 return nfs23_parse_monolithic(fc, data);
1249 #if IS_ENABLED(CONFIG_NFS_V4)
1250 if (fc->fs_type == &nfs4_fs_type)
1251 return nfs4_parse_monolithic(fc, data);
1254 return nfs_invalf(fc, "NFS: Unsupported monolithic data version");
1258 * Validate the preparsed information in the config.
1260 static int nfs_fs_context_validate(struct fs_context *fc)
1262 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1263 struct nfs_subversion *nfs_mod;
1264 struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
1265 int max_namelen = PAGE_SIZE;
1266 int max_pathlen = NFS_MAXPATHLEN;
1271 goto out_no_device_name;
1273 /* Check for sanity first. */
1274 if (ctx->minorversion && ctx->version != 4)
1275 goto out_minorversion_mismatch;
1277 if (ctx->options & NFS_OPTION_MIGRATION &&
1278 (ctx->version != 4 || ctx->minorversion != 0))
1279 goto out_migration_misuse;
1281 /* Verify that any proto=/mountproto= options match the address
1282 * families in the addr=/mountaddr= options.
1284 if (ctx->protofamily != AF_UNSPEC &&
1285 ctx->protofamily != ctx->nfs_server.address.sa_family)
1286 goto out_proto_mismatch;
1288 if (ctx->mountfamily != AF_UNSPEC) {
1289 if (ctx->mount_server.addrlen) {
1290 if (ctx->mountfamily != ctx->mount_server.address.sa_family)
1291 goto out_mountproto_mismatch;
1293 if (ctx->mountfamily != ctx->nfs_server.address.sa_family)
1294 goto out_mountproto_mismatch;
1298 if (!nfs_verify_server_address(sap))
1299 goto out_no_address;
1301 if (ctx->version == 4) {
1302 if (IS_ENABLED(CONFIG_NFS_V4)) {
1303 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
1304 port = NFS_RDMA_PORT;
1307 max_namelen = NFS4_MAXNAMLEN;
1308 max_pathlen = NFS4_MAXPATHLEN;
1309 nfs_validate_transport_protocol(ctx);
1310 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
1311 goto out_invalid_transport_udp;
1312 ctx->flags &= ~(NFS_MOUNT_NONLM | NFS_MOUNT_NOACL |
1313 NFS_MOUNT_VER3 | NFS_MOUNT_LOCAL_FLOCK |
1314 NFS_MOUNT_LOCAL_FCNTL);
1316 goto out_v4_not_compiled;
1319 nfs_set_mount_transport_protocol(ctx);
1320 #ifdef CONFIG_NFS_DISABLE_UDP_SUPPORT
1321 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
1322 goto out_invalid_transport_udp;
1324 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
1325 port = NFS_RDMA_PORT;
1328 nfs_set_port(sap, &ctx->nfs_server.port, port);
1330 ret = nfs_parse_source(fc, max_namelen, max_pathlen);
1334 /* Load the NFS protocol module if we haven't done so yet */
1335 if (!ctx->nfs_mod) {
1336 nfs_mod = get_nfs_version(ctx->version);
1337 if (IS_ERR(nfs_mod)) {
1338 ret = PTR_ERR(nfs_mod);
1339 goto out_version_unavailable;
1341 ctx->nfs_mod = nfs_mod;
1344 /* Ensure the filesystem context has the correct fs_type */
1345 if (fc->fs_type != ctx->nfs_mod->nfs_fs) {
1346 module_put(fc->fs_type->owner);
1347 __module_get(ctx->nfs_mod->nfs_fs->owner);
1348 fc->fs_type = ctx->nfs_mod->nfs_fs;
1353 return nfs_invalf(fc, "NFS: Device name not specified");
1354 out_v4_not_compiled:
1355 nfs_errorf(fc, "NFS: NFSv4 is not compiled into kernel");
1356 return -EPROTONOSUPPORT;
1357 out_invalid_transport_udp:
1358 return nfs_invalf(fc, "NFS: Unsupported transport protocol udp");
1360 return nfs_invalf(fc, "NFS: mount program didn't pass remote address");
1361 out_mountproto_mismatch:
1362 return nfs_invalf(fc, "NFS: Mount server address does not match mountproto= option");
1364 return nfs_invalf(fc, "NFS: Server address does not match proto= option");
1365 out_minorversion_mismatch:
1366 return nfs_invalf(fc, "NFS: Mount option vers=%u does not support minorversion=%u",
1367 ctx->version, ctx->minorversion);
1368 out_migration_misuse:
1369 return nfs_invalf(fc, "NFS: 'Migration' not supported for this NFS version");
1370 out_version_unavailable:
1371 nfs_errorf(fc, "NFS: Version unavailable");
1376 * Create an NFS superblock by the appropriate method.
1378 static int nfs_get_tree(struct fs_context *fc)
1380 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1381 int err = nfs_fs_context_validate(fc);
1386 return ctx->nfs_mod->rpc_ops->try_get_tree(fc);
1388 return nfs_get_tree_common(fc);
1392 * Handle duplication of a configuration. The caller copied *src into *sc, but
1393 * it can't deal with resource pointers in the filesystem context, so we have
1394 * to do that. We need to clear pointers, copy data or get extra refs as
1397 static int nfs_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)
1399 struct nfs_fs_context *src = nfs_fc2context(src_fc), *ctx;
1401 ctx = kmemdup(src, sizeof(struct nfs_fs_context), GFP_KERNEL);
1405 ctx->mntfh = nfs_alloc_fhandle();
1410 nfs_copy_fh(ctx->mntfh, src->mntfh);
1412 __module_get(ctx->nfs_mod->owner);
1413 ctx->client_address = NULL;
1414 ctx->mount_server.hostname = NULL;
1415 ctx->nfs_server.export_path = NULL;
1416 ctx->nfs_server.hostname = NULL;
1417 ctx->fscache_uniq = NULL;
1418 ctx->clone_data.fattr = NULL;
1419 fc->fs_private = ctx;
1423 static void nfs_fs_context_free(struct fs_context *fc)
1425 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1429 nfs_free_server(ctx->server);
1431 put_nfs_version(ctx->nfs_mod);
1432 kfree(ctx->client_address);
1433 kfree(ctx->mount_server.hostname);
1434 kfree(ctx->nfs_server.export_path);
1435 kfree(ctx->nfs_server.hostname);
1436 kfree(ctx->fscache_uniq);
1437 nfs_free_fhandle(ctx->mntfh);
1438 nfs_free_fattr(ctx->clone_data.fattr);
1443 static const struct fs_context_operations nfs_fs_context_ops = {
1444 .free = nfs_fs_context_free,
1445 .dup = nfs_fs_context_dup,
1446 .parse_param = nfs_fs_context_parse_param,
1447 .parse_monolithic = nfs_fs_context_parse_monolithic,
1448 .get_tree = nfs_get_tree,
1449 .reconfigure = nfs_reconfigure,
1453 * Prepare superblock configuration. We use the namespaces attached to the
1454 * context. This may be the current process's namespaces, or it may be a
1455 * container's namespaces.
1457 static int nfs_init_fs_context(struct fs_context *fc)
1459 struct nfs_fs_context *ctx;
1461 ctx = kzalloc(sizeof(struct nfs_fs_context), GFP_KERNEL);
1465 ctx->mntfh = nfs_alloc_fhandle();
1466 if (unlikely(!ctx->mntfh)) {
1471 ctx->protofamily = AF_UNSPEC;
1472 ctx->mountfamily = AF_UNSPEC;
1473 ctx->mount_server.port = NFS_UNSPEC_PORT;
1476 /* reconfigure, start with the current config */
1477 struct nfs_server *nfss = fc->root->d_sb->s_fs_info;
1478 struct net *net = nfss->nfs_client->cl_net;
1480 ctx->flags = nfss->flags;
1481 ctx->rsize = nfss->rsize;
1482 ctx->wsize = nfss->wsize;
1483 ctx->retrans = nfss->client->cl_timeout->to_retries;
1484 ctx->selected_flavor = nfss->client->cl_auth->au_flavor;
1485 ctx->acregmin = nfss->acregmin / HZ;
1486 ctx->acregmax = nfss->acregmax / HZ;
1487 ctx->acdirmin = nfss->acdirmin / HZ;
1488 ctx->acdirmax = nfss->acdirmax / HZ;
1489 ctx->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1490 ctx->nfs_server.port = nfss->port;
1491 ctx->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1492 ctx->version = nfss->nfs_client->rpc_ops->version;
1493 ctx->minorversion = nfss->nfs_client->cl_minorversion;
1495 memcpy(&ctx->nfs_server.address, &nfss->nfs_client->cl_addr,
1496 ctx->nfs_server.addrlen);
1498 if (fc->net_ns != net) {
1499 put_net(fc->net_ns);
1500 fc->net_ns = get_net(net);
1503 ctx->nfs_mod = nfss->nfs_client->cl_nfs_mod;
1504 __module_get(ctx->nfs_mod->owner);
1507 ctx->timeo = NFS_UNSPEC_TIMEO;
1508 ctx->retrans = NFS_UNSPEC_RETRANS;
1509 ctx->acregmin = NFS_DEF_ACREGMIN;
1510 ctx->acregmax = NFS_DEF_ACREGMAX;
1511 ctx->acdirmin = NFS_DEF_ACDIRMIN;
1512 ctx->acdirmax = NFS_DEF_ACDIRMAX;
1513 ctx->nfs_server.port = NFS_UNSPEC_PORT;
1514 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1515 ctx->selected_flavor = RPC_AUTH_MAXFLAVOR;
1516 ctx->minorversion = 0;
1517 ctx->need_mount = true;
1519 fc->s_iflags |= SB_I_STABLE_WRITES;
1521 fc->fs_private = ctx;
1522 fc->ops = &nfs_fs_context_ops;
1526 struct file_system_type nfs_fs_type = {
1527 .owner = THIS_MODULE,
1529 .init_fs_context = nfs_init_fs_context,
1530 .parameters = nfs_fs_parameters,
1531 .kill_sb = nfs_kill_super,
1532 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
1534 MODULE_ALIAS_FS("nfs");
1535 EXPORT_SYMBOL_GPL(nfs_fs_type);
1537 #if IS_ENABLED(CONFIG_NFS_V4)
1538 struct file_system_type nfs4_fs_type = {
1539 .owner = THIS_MODULE,
1541 .init_fs_context = nfs_init_fs_context,
1542 .parameters = nfs_fs_parameters,
1543 .kill_sb = nfs_kill_super,
1544 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
1546 MODULE_ALIAS_FS("nfs4");
1547 MODULE_ALIAS("nfs4");
1548 EXPORT_SYMBOL_GPL(nfs4_fs_type);
1549 #endif /* CONFIG_NFS_V4 */