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
94 static const struct constant_table nfs_param_enums_local_lock[] = {
95 { "all", Opt_local_lock_all },
96 { "flock", Opt_local_lock_flock },
97 { "posix", Opt_local_lock_posix },
98 { "none", Opt_local_lock_none },
104 Opt_lookupcache_none,
105 Opt_lookupcache_positive,
108 static const struct constant_table nfs_param_enums_lookupcache[] = {
109 { "all", Opt_lookupcache_all },
110 { "none", Opt_lookupcache_none },
111 { "pos", Opt_lookupcache_positive },
112 { "positive", Opt_lookupcache_positive },
116 static const struct fs_parameter_spec nfs_fs_parameters[] = {
117 fsparam_flag_no("ac", Opt_ac),
118 fsparam_u32 ("acdirmax", Opt_acdirmax),
119 fsparam_u32 ("acdirmin", Opt_acdirmin),
120 fsparam_flag_no("acl", Opt_acl),
121 fsparam_u32 ("acregmax", Opt_acregmax),
122 fsparam_u32 ("acregmin", Opt_acregmin),
123 fsparam_u32 ("actimeo", Opt_actimeo),
124 fsparam_string("addr", Opt_addr),
125 fsparam_flag ("bg", Opt_bg),
126 fsparam_u32 ("bsize", Opt_bsize),
127 fsparam_string("clientaddr", Opt_clientaddr),
128 fsparam_flag_no("cto", Opt_cto),
129 fsparam_flag ("fg", Opt_fg),
130 fsparam_flag_no("fsc", Opt_fscache_flag),
131 fsparam_string("fsc", Opt_fscache),
132 fsparam_flag ("hard", Opt_hard),
133 __fsparam(NULL, "intr", Opt_intr,
134 fs_param_neg_with_no|fs_param_deprecated, NULL),
135 fsparam_enum ("local_lock", Opt_local_lock, nfs_param_enums_local_lock),
136 fsparam_flag_no("lock", Opt_lock),
137 fsparam_enum ("lookupcache", Opt_lookupcache, nfs_param_enums_lookupcache),
138 fsparam_flag_no("migration", Opt_migration),
139 fsparam_u32 ("minorversion", Opt_minorversion),
140 fsparam_string("mountaddr", Opt_mountaddr),
141 fsparam_string("mounthost", Opt_mounthost),
142 fsparam_u32 ("mountport", Opt_mountport),
143 fsparam_string("mountproto", Opt_mountproto),
144 fsparam_u32 ("mountvers", Opt_mountvers),
145 fsparam_u32 ("namlen", Opt_namelen),
146 fsparam_u32 ("nconnect", Opt_nconnect),
147 fsparam_string("nfsvers", Opt_vers),
148 fsparam_u32 ("port", Opt_port),
149 fsparam_flag_no("posix", Opt_posix),
150 fsparam_string("proto", Opt_proto),
151 fsparam_flag_no("rdirplus", Opt_rdirplus),
152 fsparam_flag ("rdma", Opt_rdma),
153 fsparam_flag_no("resvport", Opt_resvport),
154 fsparam_u32 ("retrans", Opt_retrans),
155 fsparam_string("retry", Opt_retry),
156 fsparam_u32 ("rsize", Opt_rsize),
157 fsparam_string("sec", Opt_sec),
158 fsparam_flag_no("sharecache", Opt_sharecache),
159 fsparam_flag ("sloppy", Opt_sloppy),
160 fsparam_flag ("soft", Opt_soft),
161 fsparam_flag ("softerr", Opt_softerr),
162 fsparam_flag ("softreval", Opt_softreval),
163 fsparam_string("source", Opt_source),
164 fsparam_flag ("tcp", Opt_tcp),
165 fsparam_u32 ("timeo", Opt_timeo),
166 fsparam_flag ("udp", Opt_udp),
167 fsparam_flag ("v2", Opt_v),
168 fsparam_flag ("v3", Opt_v),
169 fsparam_flag ("v4", Opt_v),
170 fsparam_flag ("v4.0", Opt_v),
171 fsparam_flag ("v4.1", Opt_v),
172 fsparam_flag ("v4.2", Opt_v),
173 fsparam_string("vers", Opt_vers),
174 fsparam_u32 ("wsize", Opt_wsize),
187 static const struct constant_table nfs_vers_tokens[] = {
191 { "4.0", Opt_vers_4_0 },
192 { "4.1", Opt_vers_4_1 },
193 { "4.2", Opt_vers_4_2 },
207 static const struct constant_table nfs_xprt_protocol_tokens[] = {
208 { "rdma", Opt_xprt_rdma },
209 { "rdma6", Opt_xprt_rdma6 },
210 { "tcp", Opt_xprt_tcp },
211 { "tcp6", Opt_xprt_tcp6 },
212 { "udp", Opt_xprt_udp },
213 { "udp6", Opt_xprt_udp6 },
232 static const struct constant_table nfs_secflavor_tokens[] = {
233 { "krb5", Opt_sec_krb5 },
234 { "krb5i", Opt_sec_krb5i },
235 { "krb5p", Opt_sec_krb5p },
236 { "lkey", Opt_sec_lkey },
237 { "lkeyi", Opt_sec_lkeyi },
238 { "lkeyp", Opt_sec_lkeyp },
239 { "none", Opt_sec_none },
240 { "null", Opt_sec_none },
241 { "spkm3", Opt_sec_spkm },
242 { "spkm3i", Opt_sec_spkmi },
243 { "spkm3p", Opt_sec_spkmp },
244 { "sys", Opt_sec_sys },
249 * Sanity-check a server address provided by the mount command.
251 * Address family must be initialized, and address must not be
252 * the ANY address for that family.
254 static int nfs_verify_server_address(struct sockaddr *addr)
256 switch (addr->sa_family) {
258 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
259 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
262 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
263 return !ipv6_addr_any(sa);
267 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
272 * Sanity check the NFS transport protocol.
275 static void nfs_validate_transport_protocol(struct nfs_fs_context *ctx)
277 switch (ctx->nfs_server.protocol) {
278 case XPRT_TRANSPORT_UDP:
279 case XPRT_TRANSPORT_TCP:
280 case XPRT_TRANSPORT_RDMA:
283 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
288 * For text based NFSv2/v3 mounts, the mount protocol transport default
289 * settings should depend upon the specified NFS transport.
291 static void nfs_set_mount_transport_protocol(struct nfs_fs_context *ctx)
293 nfs_validate_transport_protocol(ctx);
295 if (ctx->mount_server.protocol == XPRT_TRANSPORT_UDP ||
296 ctx->mount_server.protocol == XPRT_TRANSPORT_TCP)
298 switch (ctx->nfs_server.protocol) {
299 case XPRT_TRANSPORT_UDP:
300 ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
302 case XPRT_TRANSPORT_TCP:
303 case XPRT_TRANSPORT_RDMA:
304 ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
309 * Add 'flavor' to 'auth_info' if not already present.
310 * Returns true if 'flavor' ends up in the list, false otherwise
312 static int nfs_auth_info_add(struct fs_context *fc,
313 struct nfs_auth_info *auth_info,
314 rpc_authflavor_t flavor)
317 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
319 /* make sure this flavor isn't already in the list */
320 for (i = 0; i < auth_info->flavor_len; i++) {
321 if (flavor == auth_info->flavors[i])
325 if (auth_info->flavor_len + 1 >= max_flavor_len)
326 return nfs_invalf(fc, "NFS: too many sec= flavors");
328 auth_info->flavors[auth_info->flavor_len++] = flavor;
333 * Parse the value of the 'sec=' option.
335 static int nfs_parse_security_flavors(struct fs_context *fc,
336 struct fs_parameter *param)
338 struct nfs_fs_context *ctx = nfs_fc2context(fc);
339 rpc_authflavor_t pseudoflavor;
340 char *string = param->string, *p;
343 dfprintk(MOUNT, "NFS: parsing %s=%s option\n", param->key, param->string);
345 while ((p = strsep(&string, ":")) != NULL) {
348 switch (lookup_constant(nfs_secflavor_tokens, p, -1)) {
350 pseudoflavor = RPC_AUTH_NULL;
353 pseudoflavor = RPC_AUTH_UNIX;
356 pseudoflavor = RPC_AUTH_GSS_KRB5;
359 pseudoflavor = RPC_AUTH_GSS_KRB5I;
362 pseudoflavor = RPC_AUTH_GSS_KRB5P;
365 pseudoflavor = RPC_AUTH_GSS_LKEY;
368 pseudoflavor = RPC_AUTH_GSS_LKEYI;
371 pseudoflavor = RPC_AUTH_GSS_LKEYP;
374 pseudoflavor = RPC_AUTH_GSS_SPKM;
377 pseudoflavor = RPC_AUTH_GSS_SPKMI;
380 pseudoflavor = RPC_AUTH_GSS_SPKMP;
383 return nfs_invalf(fc, "NFS: sec=%s option not recognized", p);
386 ret = nfs_auth_info_add(fc, &ctx->auth_info, pseudoflavor);
394 static int nfs_parse_version_string(struct fs_context *fc,
397 struct nfs_fs_context *ctx = nfs_fc2context(fc);
399 ctx->flags &= ~NFS_MOUNT_VER3;
400 switch (lookup_constant(nfs_vers_tokens, string, -1)) {
405 ctx->flags |= NFS_MOUNT_VER3;
409 /* Backward compatibility option. In future,
410 * the mount program should always supply
411 * a NFSv4 minor version number.
417 ctx->minorversion = 0;
421 ctx->minorversion = 1;
425 ctx->minorversion = 2;
428 return nfs_invalf(fc, "NFS: Unsupported NFS version");
434 * Parse a single mount parameter.
436 static int nfs_fs_context_parse_param(struct fs_context *fc,
437 struct fs_parameter *param)
439 struct fs_parse_result result;
440 struct nfs_fs_context *ctx = nfs_fc2context(fc);
441 unsigned short protofamily, mountfamily;
445 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", param->key);
447 opt = fs_parse(fc, nfs_fs_parameters, param, &result);
449 return ctx->sloppy ? 1 : opt;
454 return nfs_invalf(fc, "NFS: Multiple sources not supported");
455 fc->source = param->string;
456 param->string = NULL;
460 * boolean options: foo/nofoo
463 ctx->flags |= NFS_MOUNT_SOFT;
464 ctx->flags &= ~NFS_MOUNT_SOFTERR;
467 ctx->flags |= NFS_MOUNT_SOFTERR | NFS_MOUNT_SOFTREVAL;
468 ctx->flags &= ~NFS_MOUNT_SOFT;
471 ctx->flags &= ~(NFS_MOUNT_SOFT |
473 NFS_MOUNT_SOFTREVAL);
477 ctx->flags &= ~NFS_MOUNT_SOFTREVAL;
479 ctx->flags &= NFS_MOUNT_SOFTREVAL;
483 ctx->flags &= ~NFS_MOUNT_POSIX;
485 ctx->flags |= NFS_MOUNT_POSIX;
489 ctx->flags |= NFS_MOUNT_NOCTO;
491 ctx->flags &= ~NFS_MOUNT_NOCTO;
495 ctx->flags |= NFS_MOUNT_NOAC;
497 ctx->flags &= ~NFS_MOUNT_NOAC;
500 if (result.negated) {
501 ctx->flags |= NFS_MOUNT_NONLM;
502 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
504 ctx->flags &= ~NFS_MOUNT_NONLM;
505 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
509 ctx->flags &= ~NFS_MOUNT_TCP;
510 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
514 ctx->flags |= NFS_MOUNT_TCP; /* for side protocols */
515 ret = xprt_find_transport_ident(param->key);
517 goto out_bad_transport;
518 ctx->nfs_server.protocol = ret;
522 ctx->flags |= NFS_MOUNT_NOACL;
524 ctx->flags &= ~NFS_MOUNT_NOACL;
528 ctx->flags |= NFS_MOUNT_NORDIRPLUS;
530 ctx->flags &= ~NFS_MOUNT_NORDIRPLUS;
534 ctx->flags |= NFS_MOUNT_UNSHARED;
536 ctx->flags &= ~NFS_MOUNT_UNSHARED;
540 ctx->flags |= NFS_MOUNT_NORESVPORT;
542 ctx->flags &= ~NFS_MOUNT_NORESVPORT;
544 case Opt_fscache_flag:
546 ctx->options &= ~NFS_OPTION_FSCACHE;
548 ctx->options |= NFS_OPTION_FSCACHE;
549 kfree(ctx->fscache_uniq);
550 ctx->fscache_uniq = NULL;
553 ctx->options |= NFS_OPTION_FSCACHE;
554 kfree(ctx->fscache_uniq);
555 ctx->fscache_uniq = param->string;
556 param->string = NULL;
560 ctx->options &= ~NFS_OPTION_MIGRATION;
562 ctx->options |= NFS_OPTION_MIGRATION;
566 * options that take numeric values
569 if (result.uint_32 > USHRT_MAX)
571 ctx->nfs_server.port = result.uint_32;
574 ctx->rsize = result.uint_32;
577 ctx->wsize = result.uint_32;
580 ctx->bsize = result.uint_32;
583 if (result.uint_32 < 1 || result.uint_32 > INT_MAX)
585 ctx->timeo = result.uint_32;
588 if (result.uint_32 > INT_MAX)
590 ctx->retrans = result.uint_32;
593 ctx->acregmin = result.uint_32;
596 ctx->acregmax = result.uint_32;
599 ctx->acdirmin = result.uint_32;
602 ctx->acdirmax = result.uint_32;
605 ctx->acregmin = result.uint_32;
606 ctx->acregmax = result.uint_32;
607 ctx->acdirmin = result.uint_32;
608 ctx->acdirmax = result.uint_32;
611 ctx->namlen = result.uint_32;
614 if (result.uint_32 > USHRT_MAX)
616 ctx->mount_server.port = result.uint_32;
619 if (result.uint_32 < NFS_MNT_VERSION ||
620 result.uint_32 > NFS_MNT3_VERSION)
622 ctx->mount_server.version = result.uint_32;
624 case Opt_minorversion:
625 if (result.uint_32 > NFS4_MAX_MINOR_VERSION)
627 ctx->minorversion = result.uint_32;
631 * options that take text values
634 ret = nfs_parse_version_string(fc, param->key + 1);
639 ret = nfs_parse_version_string(fc, param->string);
644 ret = nfs_parse_security_flavors(fc, param);
650 protofamily = AF_INET;
651 switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
653 protofamily = AF_INET6;
656 ctx->flags &= ~NFS_MOUNT_TCP;
657 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
660 protofamily = AF_INET6;
663 ctx->flags |= NFS_MOUNT_TCP;
664 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
667 protofamily = AF_INET6;
670 /* vector side protocols to TCP */
671 ctx->flags |= NFS_MOUNT_TCP;
672 ret = xprt_find_transport_ident(param->string);
674 goto out_bad_transport;
675 ctx->nfs_server.protocol = ret;
678 goto out_bad_transport;
681 ctx->protofamily = protofamily;
685 mountfamily = AF_INET;
686 switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
688 mountfamily = AF_INET6;
691 ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
694 mountfamily = AF_INET6;
697 ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
699 case Opt_xprt_rdma: /* not used for side protocols */
701 goto out_bad_transport;
703 ctx->mountfamily = mountfamily;
707 len = rpc_pton(fc->net_ns, param->string, param->size,
708 &ctx->nfs_server.address,
709 sizeof(ctx->nfs_server._address));
711 goto out_invalid_address;
712 ctx->nfs_server.addrlen = len;
715 kfree(ctx->client_address);
716 ctx->client_address = param->string;
717 param->string = NULL;
720 kfree(ctx->mount_server.hostname);
721 ctx->mount_server.hostname = param->string;
722 param->string = NULL;
725 len = rpc_pton(fc->net_ns, param->string, param->size,
726 &ctx->mount_server.address,
727 sizeof(ctx->mount_server._address));
729 goto out_invalid_address;
730 ctx->mount_server.addrlen = len;
733 if (result.uint_32 < 1 || result.uint_32 > NFS_MAX_CONNECTIONS)
735 ctx->nfs_server.nconnect = result.uint_32;
737 case Opt_lookupcache:
738 switch (result.uint_32) {
739 case Opt_lookupcache_all:
740 ctx->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
742 case Opt_lookupcache_positive:
743 ctx->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
744 ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
746 case Opt_lookupcache_none:
747 ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
750 goto out_invalid_value;
754 switch (result.uint_32) {
755 case Opt_local_lock_all:
756 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK |
757 NFS_MOUNT_LOCAL_FCNTL);
759 case Opt_local_lock_flock:
760 ctx->flags |= NFS_MOUNT_LOCAL_FLOCK;
762 case Opt_local_lock_posix:
763 ctx->flags |= NFS_MOUNT_LOCAL_FCNTL;
765 case Opt_local_lock_none:
766 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
767 NFS_MOUNT_LOCAL_FCNTL);
770 goto out_invalid_value;
779 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
786 return nfs_invalf(fc, "NFS: Bad mount option value specified");
788 return nfs_invalf(fc, "NFS: Bad IP address specified");
790 return nfs_invalf(fc, "NFS: Value for '%s' out of range", param->key);
792 return nfs_invalf(fc, "NFS: Unrecognized transport protocol");
796 * Split fc->source into "hostname:export_path".
798 * The leftmost colon demarks the split between the server's hostname
799 * and the export path. If the hostname starts with a left square
800 * bracket, then it may contain colons.
802 * Note: caller frees hostname and export path, even on error.
804 static int nfs_parse_source(struct fs_context *fc,
805 size_t maxnamlen, size_t maxpathlen)
807 struct nfs_fs_context *ctx = nfs_fc2context(fc);
808 const char *dev_name = fc->source;
812 if (unlikely(!dev_name || !*dev_name)) {
813 dfprintk(MOUNT, "NFS: device name not specified\n");
817 /* Is the host name protected with square brakcets? */
818 if (*dev_name == '[') {
819 end = strchr(++dev_name, ']');
820 if (end == NULL || end[1] != ':')
821 goto out_bad_devname;
823 len = end - dev_name;
828 end = strchr(dev_name, ':');
830 goto out_bad_devname;
831 len = end - dev_name;
833 /* kill possible hostname list: not supported */
834 comma = memchr(dev_name, ',', len);
836 len = comma - dev_name;
842 kfree(ctx->nfs_server.hostname);
844 /* N.B. caller will free nfs_server.hostname in all cases */
845 ctx->nfs_server.hostname = kmemdup_nul(dev_name, len, GFP_KERNEL);
846 if (!ctx->nfs_server.hostname)
849 if (len > maxpathlen)
851 ctx->nfs_server.export_path = kmemdup_nul(end, len, GFP_KERNEL);
852 if (!ctx->nfs_server.export_path)
855 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", ctx->nfs_server.export_path);
859 return nfs_invalf(fc, "NFS: device name not in host:path format");
861 nfs_errorf(fc, "NFS: not enough memory to parse device name");
864 nfs_errorf(fc, "NFS: server hostname too long");
865 return -ENAMETOOLONG;
867 nfs_errorf(fc, "NFS: export pathname too long");
868 return -ENAMETOOLONG;
871 static inline bool is_remount_fc(struct fs_context *fc)
873 return fc->root != NULL;
877 * Parse monolithic NFS2/NFS3 mount data
878 * - fills in the mount root filehandle
880 * For option strings, user space handles the following behaviors:
882 * + DNS: mapping server host name to IP address ("addr=" option)
884 * + failure mode: how to behave if a mount request can't be handled
885 * immediately ("fg/bg" option)
887 * + retry: how often to retry a mount request ("retry=" option)
889 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
890 * mountproto=tcp after mountproto=udp, and so on
892 static int nfs23_parse_monolithic(struct fs_context *fc,
893 struct nfs_mount_data *data)
895 struct nfs_fs_context *ctx = nfs_fc2context(fc);
896 struct nfs_fh *mntfh = ctx->mntfh;
897 struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
898 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
903 ctx->version = NFS_DEFAULT_VERSION;
904 switch (data->version) {
912 if (data->flags & NFS_MOUNT_VER3)
914 data->root.size = NFS2_FHSIZE;
915 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
916 /* Turn off security negotiation */
917 extra_flags |= NFS_MOUNT_SECFLAVOUR;
920 if (data->flags & NFS_MOUNT_SECFLAVOUR)
924 memset(data->context, 0, sizeof(data->context));
927 if (data->flags & NFS_MOUNT_VER3) {
928 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
930 mntfh->size = data->root.size;
933 mntfh->size = NFS2_FHSIZE;
938 memcpy(mntfh->data, data->root.data, mntfh->size);
939 if (mntfh->size < sizeof(mntfh->data))
940 memset(mntfh->data + mntfh->size, 0,
941 sizeof(mntfh->data) - mntfh->size);
944 * Translate to nfs_fs_context, which nfs_fill_super
947 ctx->flags = data->flags & NFS_MOUNT_FLAGMASK;
948 ctx->flags |= extra_flags;
949 ctx->rsize = data->rsize;
950 ctx->wsize = data->wsize;
951 ctx->timeo = data->timeo;
952 ctx->retrans = data->retrans;
953 ctx->acregmin = data->acregmin;
954 ctx->acregmax = data->acregmax;
955 ctx->acdirmin = data->acdirmin;
956 ctx->acdirmax = data->acdirmax;
957 ctx->need_mount = false;
959 memcpy(sap, &data->addr, sizeof(data->addr));
960 ctx->nfs_server.addrlen = sizeof(data->addr);
961 ctx->nfs_server.port = ntohs(data->addr.sin_port);
962 if (sap->sa_family != AF_INET ||
963 !nfs_verify_server_address(sap))
966 if (!(data->flags & NFS_MOUNT_TCP))
967 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
968 /* N.B. caller will free nfs_server.hostname in all cases */
969 ctx->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
970 if (!ctx->nfs_server.hostname)
973 ctx->namlen = data->namlen;
974 ctx->bsize = data->bsize;
976 if (data->flags & NFS_MOUNT_SECFLAVOUR)
977 ctx->selected_flavor = data->pseudoflavor;
979 ctx->selected_flavor = RPC_AUTH_UNIX;
981 if (!(data->flags & NFS_MOUNT_NONLM))
982 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
983 NFS_MOUNT_LOCAL_FCNTL);
985 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK|
986 NFS_MOUNT_LOCAL_FCNTL);
989 * The legacy version 6 binary mount data from userspace has a
990 * field used only to transport selinux information into the
991 * kernel. To continue to support that functionality we
992 * have a touch of selinux knowledge here in the NFS code. The
993 * userspace code converted context=blah to just blah so we are
994 * converting back to the full string selinux understands.
996 if (data->context[0]){
997 #ifdef CONFIG_SECURITY_SELINUX
1000 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1001 ret = vfs_parse_fs_string(fc, "context",
1002 data->context, strlen(data->context));
1015 ctx->skip_reconfig_option_check = true;
1019 return generic_parse_monolithic(fc, data);
1022 if (is_remount_fc(fc)) {
1023 ctx->skip_reconfig_option_check = true;
1026 return nfs_invalf(fc, "NFS: mount program didn't pass any mount data");
1029 return nfs_invalf(fc, "NFS: nfs_mount_data version does not support v3");
1032 return nfs_invalf(fc, "NFS: nfs_mount_data version supports only AUTH_SYS");
1035 dfprintk(MOUNT, "NFS: not enough memory to handle mount options");
1039 return nfs_invalf(fc, "NFS: mount program didn't pass remote address");
1042 return nfs_invalf(fc, "NFS: invalid root filehandle");
1045 #if IS_ENABLED(CONFIG_NFS_V4)
1046 struct compat_nfs_string {
1051 static inline void compat_nfs_string(struct nfs_string *dst,
1052 struct compat_nfs_string *src)
1054 dst->data = compat_ptr(src->data);
1055 dst->len = src->len;
1058 struct compat_nfs4_mount_data_v1 {
1059 compat_int_t version;
1064 compat_int_t retrans;
1065 compat_int_t acregmin;
1066 compat_int_t acregmax;
1067 compat_int_t acdirmin;
1068 compat_int_t acdirmax;
1069 struct compat_nfs_string client_addr;
1070 struct compat_nfs_string mnt_path;
1071 struct compat_nfs_string hostname;
1072 compat_uint_t host_addrlen;
1073 compat_uptr_t host_addr;
1075 compat_int_t auth_flavourlen;
1076 compat_uptr_t auth_flavours;
1079 static void nfs4_compat_mount_data_conv(struct nfs4_mount_data *data)
1081 struct compat_nfs4_mount_data_v1 *compat =
1082 (struct compat_nfs4_mount_data_v1 *)data;
1084 /* copy the fields backwards */
1085 data->auth_flavours = compat_ptr(compat->auth_flavours);
1086 data->auth_flavourlen = compat->auth_flavourlen;
1087 data->proto = compat->proto;
1088 data->host_addr = compat_ptr(compat->host_addr);
1089 data->host_addrlen = compat->host_addrlen;
1090 compat_nfs_string(&data->hostname, &compat->hostname);
1091 compat_nfs_string(&data->mnt_path, &compat->mnt_path);
1092 compat_nfs_string(&data->client_addr, &compat->client_addr);
1093 data->acdirmax = compat->acdirmax;
1094 data->acdirmin = compat->acdirmin;
1095 data->acregmax = compat->acregmax;
1096 data->acregmin = compat->acregmin;
1097 data->retrans = compat->retrans;
1098 data->timeo = compat->timeo;
1099 data->wsize = compat->wsize;
1100 data->rsize = compat->rsize;
1101 data->flags = compat->flags;
1102 data->version = compat->version;
1106 * Validate NFSv4 mount options
1108 static int nfs4_parse_monolithic(struct fs_context *fc,
1109 struct nfs4_mount_data *data)
1111 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1112 struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
1116 if (is_remount_fc(fc))
1118 return nfs_invalf(fc,
1119 "NFS4: mount program didn't pass any mount data");
1124 if (data->version != 1)
1125 return generic_parse_monolithic(fc, data);
1127 if (in_compat_syscall())
1128 nfs4_compat_mount_data_conv(data);
1130 if (data->host_addrlen > sizeof(ctx->nfs_server.address))
1131 goto out_no_address;
1132 if (data->host_addrlen == 0)
1133 goto out_no_address;
1134 ctx->nfs_server.addrlen = data->host_addrlen;
1135 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
1137 if (!nfs_verify_server_address(sap))
1138 goto out_no_address;
1139 ctx->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
1141 if (data->auth_flavourlen) {
1142 rpc_authflavor_t pseudoflavor;
1144 if (data->auth_flavourlen > 1)
1145 goto out_inval_auth;
1146 if (copy_from_user(&pseudoflavor, data->auth_flavours,
1147 sizeof(pseudoflavor)))
1149 ctx->selected_flavor = pseudoflavor;
1151 ctx->selected_flavor = RPC_AUTH_UNIX;
1154 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1157 ctx->nfs_server.hostname = c;
1159 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1162 ctx->nfs_server.export_path = c;
1163 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1165 c = strndup_user(data->client_addr.data, 16);
1168 ctx->client_address = c;
1171 * Translate to nfs_fs_context, which nfs_fill_super
1175 ctx->flags = data->flags & NFS4_MOUNT_FLAGMASK;
1176 ctx->rsize = data->rsize;
1177 ctx->wsize = data->wsize;
1178 ctx->timeo = data->timeo;
1179 ctx->retrans = data->retrans;
1180 ctx->acregmin = data->acregmin;
1181 ctx->acregmax = data->acregmax;
1182 ctx->acdirmin = data->acdirmin;
1183 ctx->acdirmax = data->acdirmax;
1184 ctx->nfs_server.protocol = data->proto;
1185 nfs_validate_transport_protocol(ctx);
1186 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
1187 goto out_invalid_transport_udp;
1189 ctx->skip_reconfig_option_check = true;
1193 return nfs_invalf(fc, "NFS4: Invalid number of RPC auth flavours %d",
1194 data->auth_flavourlen);
1197 return nfs_invalf(fc, "NFS4: mount program didn't pass remote address");
1199 out_invalid_transport_udp:
1200 return nfs_invalf(fc, "NFS: Unsupported transport protocol udp");
1205 * Parse a monolithic block of data from sys_mount().
1207 static int nfs_fs_context_parse_monolithic(struct fs_context *fc,
1210 if (fc->fs_type == &nfs_fs_type)
1211 return nfs23_parse_monolithic(fc, data);
1213 #if IS_ENABLED(CONFIG_NFS_V4)
1214 if (fc->fs_type == &nfs4_fs_type)
1215 return nfs4_parse_monolithic(fc, data);
1218 return nfs_invalf(fc, "NFS: Unsupported monolithic data version");
1222 * Validate the preparsed information in the config.
1224 static int nfs_fs_context_validate(struct fs_context *fc)
1226 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1227 struct nfs_subversion *nfs_mod;
1228 struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
1229 int max_namelen = PAGE_SIZE;
1230 int max_pathlen = NFS_MAXPATHLEN;
1235 goto out_no_device_name;
1237 /* Check for sanity first. */
1238 if (ctx->minorversion && ctx->version != 4)
1239 goto out_minorversion_mismatch;
1241 if (ctx->options & NFS_OPTION_MIGRATION &&
1242 (ctx->version != 4 || ctx->minorversion != 0))
1243 goto out_migration_misuse;
1245 /* Verify that any proto=/mountproto= options match the address
1246 * families in the addr=/mountaddr= options.
1248 if (ctx->protofamily != AF_UNSPEC &&
1249 ctx->protofamily != ctx->nfs_server.address.sa_family)
1250 goto out_proto_mismatch;
1252 if (ctx->mountfamily != AF_UNSPEC) {
1253 if (ctx->mount_server.addrlen) {
1254 if (ctx->mountfamily != ctx->mount_server.address.sa_family)
1255 goto out_mountproto_mismatch;
1257 if (ctx->mountfamily != ctx->nfs_server.address.sa_family)
1258 goto out_mountproto_mismatch;
1262 if (!nfs_verify_server_address(sap))
1263 goto out_no_address;
1265 if (ctx->version == 4) {
1266 if (IS_ENABLED(CONFIG_NFS_V4)) {
1267 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
1268 port = NFS_RDMA_PORT;
1271 max_namelen = NFS4_MAXNAMLEN;
1272 max_pathlen = NFS4_MAXPATHLEN;
1273 nfs_validate_transport_protocol(ctx);
1274 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
1275 goto out_invalid_transport_udp;
1276 ctx->flags &= ~(NFS_MOUNT_NONLM | NFS_MOUNT_NOACL |
1277 NFS_MOUNT_VER3 | NFS_MOUNT_LOCAL_FLOCK |
1278 NFS_MOUNT_LOCAL_FCNTL);
1280 goto out_v4_not_compiled;
1283 nfs_set_mount_transport_protocol(ctx);
1284 #ifdef CONFIG_NFS_DISABLE_UDP_SUPPORT
1285 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
1286 goto out_invalid_transport_udp;
1288 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
1289 port = NFS_RDMA_PORT;
1292 nfs_set_port(sap, &ctx->nfs_server.port, port);
1294 ret = nfs_parse_source(fc, max_namelen, max_pathlen);
1298 /* Load the NFS protocol module if we haven't done so yet */
1299 if (!ctx->nfs_mod) {
1300 nfs_mod = get_nfs_version(ctx->version);
1301 if (IS_ERR(nfs_mod)) {
1302 ret = PTR_ERR(nfs_mod);
1303 goto out_version_unavailable;
1305 ctx->nfs_mod = nfs_mod;
1308 /* Ensure the filesystem context has the correct fs_type */
1309 if (fc->fs_type != ctx->nfs_mod->nfs_fs) {
1310 module_put(fc->fs_type->owner);
1311 __module_get(ctx->nfs_mod->nfs_fs->owner);
1312 fc->fs_type = ctx->nfs_mod->nfs_fs;
1317 return nfs_invalf(fc, "NFS: Device name not specified");
1318 out_v4_not_compiled:
1319 nfs_errorf(fc, "NFS: NFSv4 is not compiled into kernel");
1320 return -EPROTONOSUPPORT;
1321 out_invalid_transport_udp:
1322 return nfs_invalf(fc, "NFS: Unsupported transport protocol udp");
1324 return nfs_invalf(fc, "NFS: mount program didn't pass remote address");
1325 out_mountproto_mismatch:
1326 return nfs_invalf(fc, "NFS: Mount server address does not match mountproto= option");
1328 return nfs_invalf(fc, "NFS: Server address does not match proto= option");
1329 out_minorversion_mismatch:
1330 return nfs_invalf(fc, "NFS: Mount option vers=%u does not support minorversion=%u",
1331 ctx->version, ctx->minorversion);
1332 out_migration_misuse:
1333 return nfs_invalf(fc, "NFS: 'Migration' not supported for this NFS version");
1334 out_version_unavailable:
1335 nfs_errorf(fc, "NFS: Version unavailable");
1340 * Create an NFS superblock by the appropriate method.
1342 static int nfs_get_tree(struct fs_context *fc)
1344 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1345 int err = nfs_fs_context_validate(fc);
1350 return ctx->nfs_mod->rpc_ops->try_get_tree(fc);
1352 return nfs_get_tree_common(fc);
1356 * Handle duplication of a configuration. The caller copied *src into *sc, but
1357 * it can't deal with resource pointers in the filesystem context, so we have
1358 * to do that. We need to clear pointers, copy data or get extra refs as
1361 static int nfs_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)
1363 struct nfs_fs_context *src = nfs_fc2context(src_fc), *ctx;
1365 ctx = kmemdup(src, sizeof(struct nfs_fs_context), GFP_KERNEL);
1369 ctx->mntfh = nfs_alloc_fhandle();
1374 nfs_copy_fh(ctx->mntfh, src->mntfh);
1376 __module_get(ctx->nfs_mod->owner);
1377 ctx->client_address = NULL;
1378 ctx->mount_server.hostname = NULL;
1379 ctx->nfs_server.export_path = NULL;
1380 ctx->nfs_server.hostname = NULL;
1381 ctx->fscache_uniq = NULL;
1382 ctx->clone_data.fattr = NULL;
1383 fc->fs_private = ctx;
1387 static void nfs_fs_context_free(struct fs_context *fc)
1389 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1393 nfs_free_server(ctx->server);
1395 put_nfs_version(ctx->nfs_mod);
1396 kfree(ctx->client_address);
1397 kfree(ctx->mount_server.hostname);
1398 kfree(ctx->nfs_server.export_path);
1399 kfree(ctx->nfs_server.hostname);
1400 kfree(ctx->fscache_uniq);
1401 nfs_free_fhandle(ctx->mntfh);
1402 nfs_free_fattr(ctx->clone_data.fattr);
1407 static const struct fs_context_operations nfs_fs_context_ops = {
1408 .free = nfs_fs_context_free,
1409 .dup = nfs_fs_context_dup,
1410 .parse_param = nfs_fs_context_parse_param,
1411 .parse_monolithic = nfs_fs_context_parse_monolithic,
1412 .get_tree = nfs_get_tree,
1413 .reconfigure = nfs_reconfigure,
1417 * Prepare superblock configuration. We use the namespaces attached to the
1418 * context. This may be the current process's namespaces, or it may be a
1419 * container's namespaces.
1421 static int nfs_init_fs_context(struct fs_context *fc)
1423 struct nfs_fs_context *ctx;
1425 ctx = kzalloc(sizeof(struct nfs_fs_context), GFP_KERNEL);
1429 ctx->mntfh = nfs_alloc_fhandle();
1430 if (unlikely(!ctx->mntfh)) {
1435 ctx->protofamily = AF_UNSPEC;
1436 ctx->mountfamily = AF_UNSPEC;
1437 ctx->mount_server.port = NFS_UNSPEC_PORT;
1440 /* reconfigure, start with the current config */
1441 struct nfs_server *nfss = fc->root->d_sb->s_fs_info;
1442 struct net *net = nfss->nfs_client->cl_net;
1444 ctx->flags = nfss->flags;
1445 ctx->rsize = nfss->rsize;
1446 ctx->wsize = nfss->wsize;
1447 ctx->retrans = nfss->client->cl_timeout->to_retries;
1448 ctx->selected_flavor = nfss->client->cl_auth->au_flavor;
1449 ctx->acregmin = nfss->acregmin / HZ;
1450 ctx->acregmax = nfss->acregmax / HZ;
1451 ctx->acdirmin = nfss->acdirmin / HZ;
1452 ctx->acdirmax = nfss->acdirmax / HZ;
1453 ctx->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1454 ctx->nfs_server.port = nfss->port;
1455 ctx->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1456 ctx->version = nfss->nfs_client->rpc_ops->version;
1457 ctx->minorversion = nfss->nfs_client->cl_minorversion;
1459 memcpy(&ctx->nfs_server.address, &nfss->nfs_client->cl_addr,
1460 ctx->nfs_server.addrlen);
1462 if (fc->net_ns != net) {
1463 put_net(fc->net_ns);
1464 fc->net_ns = get_net(net);
1467 ctx->nfs_mod = nfss->nfs_client->cl_nfs_mod;
1468 __module_get(ctx->nfs_mod->owner);
1471 ctx->timeo = NFS_UNSPEC_TIMEO;
1472 ctx->retrans = NFS_UNSPEC_RETRANS;
1473 ctx->acregmin = NFS_DEF_ACREGMIN;
1474 ctx->acregmax = NFS_DEF_ACREGMAX;
1475 ctx->acdirmin = NFS_DEF_ACDIRMIN;
1476 ctx->acdirmax = NFS_DEF_ACDIRMAX;
1477 ctx->nfs_server.port = NFS_UNSPEC_PORT;
1478 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1479 ctx->selected_flavor = RPC_AUTH_MAXFLAVOR;
1480 ctx->minorversion = 0;
1481 ctx->need_mount = true;
1483 fc->fs_private = ctx;
1484 fc->ops = &nfs_fs_context_ops;
1488 struct file_system_type nfs_fs_type = {
1489 .owner = THIS_MODULE,
1491 .init_fs_context = nfs_init_fs_context,
1492 .parameters = nfs_fs_parameters,
1493 .kill_sb = nfs_kill_super,
1494 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
1496 MODULE_ALIAS_FS("nfs");
1497 EXPORT_SYMBOL_GPL(nfs_fs_type);
1499 #if IS_ENABLED(CONFIG_NFS_V4)
1500 struct file_system_type nfs4_fs_type = {
1501 .owner = THIS_MODULE,
1503 .init_fs_context = nfs_init_fs_context,
1504 .parameters = nfs_fs_parameters,
1505 .kill_sb = nfs_kill_super,
1506 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
1508 MODULE_ALIAS_FS("nfs4");
1509 MODULE_ALIAS("nfs4");
1510 EXPORT_SYMBOL_GPL(nfs4_fs_type);
1511 #endif /* CONFIG_NFS_V4 */