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/compat.h>
14 #include <linux/module.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>
24 #define NFSDBG_FACILITY NFSDBG_MOUNT
26 #if IS_ENABLED(CONFIG_NFS_V3)
27 #define NFS_DEFAULT_VERSION 3
29 #define NFS_DEFAULT_VERSION 2
32 #define NFS_MAX_CONNECTIONS 16
97 static const struct constant_table nfs_param_enums_local_lock[] = {
98 { "all", Opt_local_lock_all },
99 { "flock", Opt_local_lock_flock },
100 { "posix", Opt_local_lock_posix },
101 { "none", Opt_local_lock_none },
107 Opt_lookupcache_none,
108 Opt_lookupcache_positive,
111 static const struct constant_table nfs_param_enums_lookupcache[] = {
112 { "all", Opt_lookupcache_all },
113 { "none", Opt_lookupcache_none },
114 { "pos", Opt_lookupcache_positive },
115 { "positive", Opt_lookupcache_positive },
125 static const struct constant_table nfs_param_enums_write[] = {
126 { "lazy", Opt_write_lazy },
127 { "eager", Opt_write_eager },
128 { "wait", Opt_write_wait },
132 static const struct fs_parameter_spec nfs_fs_parameters[] = {
133 fsparam_flag_no("ac", Opt_ac),
134 fsparam_u32 ("acdirmax", Opt_acdirmax),
135 fsparam_u32 ("acdirmin", Opt_acdirmin),
136 fsparam_flag_no("acl", Opt_acl),
137 fsparam_u32 ("acregmax", Opt_acregmax),
138 fsparam_u32 ("acregmin", Opt_acregmin),
139 fsparam_u32 ("actimeo", Opt_actimeo),
140 fsparam_string("addr", Opt_addr),
141 fsparam_flag ("bg", Opt_bg),
142 fsparam_u32 ("bsize", Opt_bsize),
143 fsparam_string("clientaddr", Opt_clientaddr),
144 fsparam_flag_no("cto", Opt_cto),
145 fsparam_flag ("fg", Opt_fg),
146 fsparam_flag_no("fsc", Opt_fscache_flag),
147 fsparam_string("fsc", Opt_fscache),
148 fsparam_flag ("hard", Opt_hard),
149 __fsparam(NULL, "intr", Opt_intr,
150 fs_param_neg_with_no|fs_param_deprecated, NULL),
151 fsparam_enum ("local_lock", Opt_local_lock, nfs_param_enums_local_lock),
152 fsparam_flag_no("lock", Opt_lock),
153 fsparam_enum ("lookupcache", Opt_lookupcache, nfs_param_enums_lookupcache),
154 fsparam_flag_no("migration", Opt_migration),
155 fsparam_u32 ("minorversion", Opt_minorversion),
156 fsparam_string("mountaddr", Opt_mountaddr),
157 fsparam_string("mounthost", Opt_mounthost),
158 fsparam_u32 ("mountport", Opt_mountport),
159 fsparam_string("mountproto", Opt_mountproto),
160 fsparam_u32 ("mountvers", Opt_mountvers),
161 fsparam_u32 ("namlen", Opt_namelen),
162 fsparam_u32 ("nconnect", Opt_nconnect),
163 fsparam_u32 ("max_connect", Opt_max_connect),
164 fsparam_string("nfsvers", Opt_vers),
165 fsparam_u32 ("port", Opt_port),
166 fsparam_flag_no("posix", Opt_posix),
167 fsparam_string("proto", Opt_proto),
168 fsparam_flag_no("rdirplus", Opt_rdirplus),
169 fsparam_flag ("rdma", Opt_rdma),
170 fsparam_flag_no("resvport", Opt_resvport),
171 fsparam_u32 ("retrans", Opt_retrans),
172 fsparam_string("retry", Opt_retry),
173 fsparam_u32 ("rsize", Opt_rsize),
174 fsparam_string("sec", Opt_sec),
175 fsparam_flag_no("sharecache", Opt_sharecache),
176 fsparam_flag ("sloppy", Opt_sloppy),
177 fsparam_flag ("soft", Opt_soft),
178 fsparam_flag ("softerr", Opt_softerr),
179 fsparam_flag ("softreval", Opt_softreval),
180 fsparam_string("source", Opt_source),
181 fsparam_flag ("tcp", Opt_tcp),
182 fsparam_u32 ("timeo", Opt_timeo),
183 fsparam_flag ("udp", Opt_udp),
184 fsparam_flag ("v2", Opt_v),
185 fsparam_flag ("v3", Opt_v),
186 fsparam_flag ("v4", Opt_v),
187 fsparam_flag ("v4.0", Opt_v),
188 fsparam_flag ("v4.1", Opt_v),
189 fsparam_flag ("v4.2", Opt_v),
190 fsparam_string("vers", Opt_vers),
191 fsparam_enum ("write", Opt_write, nfs_param_enums_write),
192 fsparam_u32 ("wsize", Opt_wsize),
205 static const struct constant_table nfs_vers_tokens[] = {
209 { "4.0", Opt_vers_4_0 },
210 { "4.1", Opt_vers_4_1 },
211 { "4.2", Opt_vers_4_2 },
225 static const struct constant_table nfs_xprt_protocol_tokens[] = {
226 { "rdma", Opt_xprt_rdma },
227 { "rdma6", Opt_xprt_rdma6 },
228 { "tcp", Opt_xprt_tcp },
229 { "tcp6", Opt_xprt_tcp6 },
230 { "udp", Opt_xprt_udp },
231 { "udp6", Opt_xprt_udp6 },
250 static const struct constant_table nfs_secflavor_tokens[] = {
251 { "krb5", Opt_sec_krb5 },
252 { "krb5i", Opt_sec_krb5i },
253 { "krb5p", Opt_sec_krb5p },
254 { "lkey", Opt_sec_lkey },
255 { "lkeyi", Opt_sec_lkeyi },
256 { "lkeyp", Opt_sec_lkeyp },
257 { "none", Opt_sec_none },
258 { "null", Opt_sec_none },
259 { "spkm3", Opt_sec_spkm },
260 { "spkm3i", Opt_sec_spkmi },
261 { "spkm3p", Opt_sec_spkmp },
262 { "sys", Opt_sec_sys },
267 * Sanity-check a server address provided by the mount command.
269 * Address family must be initialized, and address must not be
270 * the ANY address for that family.
272 static int nfs_verify_server_address(struct sockaddr *addr)
274 switch (addr->sa_family) {
276 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
277 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
280 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
281 return !ipv6_addr_any(sa);
285 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
289 #ifdef CONFIG_NFS_DISABLE_UDP_SUPPORT
290 static bool nfs_server_transport_udp_invalid(const struct nfs_fs_context *ctx)
295 static bool nfs_server_transport_udp_invalid(const struct nfs_fs_context *ctx)
297 if (ctx->version == 4)
304 * Sanity check the NFS transport protocol.
306 static int nfs_validate_transport_protocol(struct fs_context *fc,
307 struct nfs_fs_context *ctx)
309 switch (ctx->nfs_server.protocol) {
310 case XPRT_TRANSPORT_UDP:
311 if (nfs_server_transport_udp_invalid(ctx))
312 goto out_invalid_transport_udp;
314 case XPRT_TRANSPORT_TCP:
315 case XPRT_TRANSPORT_RDMA:
318 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
321 out_invalid_transport_udp:
322 return nfs_invalf(fc, "NFS: Unsupported transport protocol udp");
326 * For text based NFSv2/v3 mounts, the mount protocol transport default
327 * settings should depend upon the specified NFS transport.
329 static void nfs_set_mount_transport_protocol(struct nfs_fs_context *ctx)
331 if (ctx->mount_server.protocol == XPRT_TRANSPORT_UDP ||
332 ctx->mount_server.protocol == XPRT_TRANSPORT_TCP)
334 switch (ctx->nfs_server.protocol) {
335 case XPRT_TRANSPORT_UDP:
336 ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
338 case XPRT_TRANSPORT_TCP:
339 case XPRT_TRANSPORT_RDMA:
340 ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
345 * Add 'flavor' to 'auth_info' if not already present.
346 * Returns true if 'flavor' ends up in the list, false otherwise
348 static int nfs_auth_info_add(struct fs_context *fc,
349 struct nfs_auth_info *auth_info,
350 rpc_authflavor_t flavor)
353 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
355 /* make sure this flavor isn't already in the list */
356 for (i = 0; i < auth_info->flavor_len; i++) {
357 if (flavor == auth_info->flavors[i])
361 if (auth_info->flavor_len + 1 >= max_flavor_len)
362 return nfs_invalf(fc, "NFS: too many sec= flavors");
364 auth_info->flavors[auth_info->flavor_len++] = flavor;
369 * Parse the value of the 'sec=' option.
371 static int nfs_parse_security_flavors(struct fs_context *fc,
372 struct fs_parameter *param)
374 struct nfs_fs_context *ctx = nfs_fc2context(fc);
375 rpc_authflavor_t pseudoflavor;
376 char *string = param->string, *p;
379 dfprintk(MOUNT, "NFS: parsing %s=%s option\n", param->key, param->string);
381 while ((p = strsep(&string, ":")) != NULL) {
384 switch (lookup_constant(nfs_secflavor_tokens, p, -1)) {
386 pseudoflavor = RPC_AUTH_NULL;
389 pseudoflavor = RPC_AUTH_UNIX;
392 pseudoflavor = RPC_AUTH_GSS_KRB5;
395 pseudoflavor = RPC_AUTH_GSS_KRB5I;
398 pseudoflavor = RPC_AUTH_GSS_KRB5P;
401 pseudoflavor = RPC_AUTH_GSS_LKEY;
404 pseudoflavor = RPC_AUTH_GSS_LKEYI;
407 pseudoflavor = RPC_AUTH_GSS_LKEYP;
410 pseudoflavor = RPC_AUTH_GSS_SPKM;
413 pseudoflavor = RPC_AUTH_GSS_SPKMI;
416 pseudoflavor = RPC_AUTH_GSS_SPKMP;
419 return nfs_invalf(fc, "NFS: sec=%s option not recognized", p);
422 ret = nfs_auth_info_add(fc, &ctx->auth_info, pseudoflavor);
430 static int nfs_parse_version_string(struct fs_context *fc,
433 struct nfs_fs_context *ctx = nfs_fc2context(fc);
435 ctx->flags &= ~NFS_MOUNT_VER3;
436 switch (lookup_constant(nfs_vers_tokens, string, -1)) {
441 ctx->flags |= NFS_MOUNT_VER3;
445 /* Backward compatibility option. In future,
446 * the mount program should always supply
447 * a NFSv4 minor version number.
453 ctx->minorversion = 0;
457 ctx->minorversion = 1;
461 ctx->minorversion = 2;
464 return nfs_invalf(fc, "NFS: Unsupported NFS version");
470 * Parse a single mount parameter.
472 static int nfs_fs_context_parse_param(struct fs_context *fc,
473 struct fs_parameter *param)
475 struct fs_parse_result result;
476 struct nfs_fs_context *ctx = nfs_fc2context(fc);
477 unsigned short protofamily, mountfamily;
481 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", param->key);
483 opt = fs_parse(fc, nfs_fs_parameters, param, &result);
485 return ctx->sloppy ? 1 : opt;
488 ctx->has_sec_mnt_opts = 1;
493 return nfs_invalf(fc, "NFS: Multiple sources not supported");
494 fc->source = param->string;
495 param->string = NULL;
499 * boolean options: foo/nofoo
502 ctx->flags |= NFS_MOUNT_SOFT;
503 ctx->flags &= ~NFS_MOUNT_SOFTERR;
506 ctx->flags |= NFS_MOUNT_SOFTERR | NFS_MOUNT_SOFTREVAL;
507 ctx->flags &= ~NFS_MOUNT_SOFT;
510 ctx->flags &= ~(NFS_MOUNT_SOFT |
512 NFS_MOUNT_SOFTREVAL);
516 ctx->flags &= ~NFS_MOUNT_SOFTREVAL;
518 ctx->flags &= NFS_MOUNT_SOFTREVAL;
522 ctx->flags &= ~NFS_MOUNT_POSIX;
524 ctx->flags |= NFS_MOUNT_POSIX;
528 ctx->flags |= NFS_MOUNT_NOCTO;
530 ctx->flags &= ~NFS_MOUNT_NOCTO;
534 ctx->flags |= NFS_MOUNT_NOAC;
536 ctx->flags &= ~NFS_MOUNT_NOAC;
539 if (result.negated) {
540 ctx->flags |= NFS_MOUNT_NONLM;
541 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
543 ctx->flags &= ~NFS_MOUNT_NONLM;
544 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
548 ctx->flags &= ~NFS_MOUNT_TCP;
549 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
553 ctx->flags |= NFS_MOUNT_TCP; /* for side protocols */
554 ret = xprt_find_transport_ident(param->key);
556 goto out_bad_transport;
557 ctx->nfs_server.protocol = ret;
561 ctx->flags |= NFS_MOUNT_NOACL;
563 ctx->flags &= ~NFS_MOUNT_NOACL;
567 ctx->flags |= NFS_MOUNT_NORDIRPLUS;
569 ctx->flags &= ~NFS_MOUNT_NORDIRPLUS;
573 ctx->flags |= NFS_MOUNT_UNSHARED;
575 ctx->flags &= ~NFS_MOUNT_UNSHARED;
579 ctx->flags |= NFS_MOUNT_NORESVPORT;
581 ctx->flags &= ~NFS_MOUNT_NORESVPORT;
583 case Opt_fscache_flag:
585 ctx->options &= ~NFS_OPTION_FSCACHE;
587 ctx->options |= NFS_OPTION_FSCACHE;
588 kfree(ctx->fscache_uniq);
589 ctx->fscache_uniq = NULL;
592 ctx->options |= NFS_OPTION_FSCACHE;
593 kfree(ctx->fscache_uniq);
594 ctx->fscache_uniq = param->string;
595 param->string = NULL;
599 ctx->options &= ~NFS_OPTION_MIGRATION;
601 ctx->options |= NFS_OPTION_MIGRATION;
605 * options that take numeric values
608 if (result.uint_32 > USHRT_MAX)
610 ctx->nfs_server.port = result.uint_32;
613 ctx->rsize = result.uint_32;
616 ctx->wsize = result.uint_32;
619 ctx->bsize = result.uint_32;
622 if (result.uint_32 < 1 || result.uint_32 > INT_MAX)
624 ctx->timeo = result.uint_32;
627 if (result.uint_32 > INT_MAX)
629 ctx->retrans = result.uint_32;
632 ctx->acregmin = result.uint_32;
635 ctx->acregmax = result.uint_32;
638 ctx->acdirmin = result.uint_32;
641 ctx->acdirmax = result.uint_32;
644 ctx->acregmin = result.uint_32;
645 ctx->acregmax = result.uint_32;
646 ctx->acdirmin = result.uint_32;
647 ctx->acdirmax = result.uint_32;
650 ctx->namlen = result.uint_32;
653 if (result.uint_32 > USHRT_MAX)
655 ctx->mount_server.port = result.uint_32;
658 if (result.uint_32 < NFS_MNT_VERSION ||
659 result.uint_32 > NFS_MNT3_VERSION)
661 ctx->mount_server.version = result.uint_32;
663 case Opt_minorversion:
664 if (result.uint_32 > NFS4_MAX_MINOR_VERSION)
666 ctx->minorversion = result.uint_32;
670 * options that take text values
673 ret = nfs_parse_version_string(fc, param->key + 1);
678 ret = nfs_parse_version_string(fc, param->string);
683 ret = nfs_parse_security_flavors(fc, param);
689 protofamily = AF_INET;
690 switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
692 protofamily = AF_INET6;
695 ctx->flags &= ~NFS_MOUNT_TCP;
696 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
699 protofamily = AF_INET6;
702 ctx->flags |= NFS_MOUNT_TCP;
703 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
706 protofamily = AF_INET6;
709 /* vector side protocols to TCP */
710 ctx->flags |= NFS_MOUNT_TCP;
711 ret = xprt_find_transport_ident(param->string);
713 goto out_bad_transport;
714 ctx->nfs_server.protocol = ret;
717 goto out_bad_transport;
720 ctx->protofamily = protofamily;
724 mountfamily = AF_INET;
725 switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
727 mountfamily = AF_INET6;
730 ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
733 mountfamily = AF_INET6;
736 ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
738 case Opt_xprt_rdma: /* not used for side protocols */
740 goto out_bad_transport;
742 ctx->mountfamily = mountfamily;
746 len = rpc_pton(fc->net_ns, param->string, param->size,
747 &ctx->nfs_server.address,
748 sizeof(ctx->nfs_server._address));
750 goto out_invalid_address;
751 ctx->nfs_server.addrlen = len;
754 kfree(ctx->client_address);
755 ctx->client_address = param->string;
756 param->string = NULL;
759 kfree(ctx->mount_server.hostname);
760 ctx->mount_server.hostname = param->string;
761 param->string = NULL;
764 len = rpc_pton(fc->net_ns, param->string, param->size,
765 &ctx->mount_server.address,
766 sizeof(ctx->mount_server._address));
768 goto out_invalid_address;
769 ctx->mount_server.addrlen = len;
772 if (result.uint_32 < 1 || result.uint_32 > NFS_MAX_CONNECTIONS)
774 ctx->nfs_server.nconnect = result.uint_32;
776 case Opt_max_connect:
777 if (result.uint_32 < 1 || result.uint_32 > NFS_MAX_TRANSPORTS)
779 ctx->nfs_server.max_connect = result.uint_32;
781 case Opt_lookupcache:
782 switch (result.uint_32) {
783 case Opt_lookupcache_all:
784 ctx->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
786 case Opt_lookupcache_positive:
787 ctx->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
788 ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
790 case Opt_lookupcache_none:
791 ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
794 goto out_invalid_value;
798 switch (result.uint_32) {
799 case Opt_local_lock_all:
800 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK |
801 NFS_MOUNT_LOCAL_FCNTL);
803 case Opt_local_lock_flock:
804 ctx->flags |= NFS_MOUNT_LOCAL_FLOCK;
806 case Opt_local_lock_posix:
807 ctx->flags |= NFS_MOUNT_LOCAL_FCNTL;
809 case Opt_local_lock_none:
810 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
811 NFS_MOUNT_LOCAL_FCNTL);
814 goto out_invalid_value;
818 switch (result.uint_32) {
821 ~(NFS_MOUNT_WRITE_EAGER | NFS_MOUNT_WRITE_WAIT);
823 case Opt_write_eager:
824 ctx->flags |= NFS_MOUNT_WRITE_EAGER;
825 ctx->flags &= ~NFS_MOUNT_WRITE_WAIT;
829 NFS_MOUNT_WRITE_EAGER | NFS_MOUNT_WRITE_WAIT;
832 goto out_invalid_value;
841 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
848 return nfs_invalf(fc, "NFS: Bad mount option value specified");
850 return nfs_invalf(fc, "NFS: Bad IP address specified");
852 return nfs_invalf(fc, "NFS: Value for '%s' out of range", param->key);
854 return nfs_invalf(fc, "NFS: Unrecognized transport protocol");
858 * Split fc->source into "hostname:export_path".
860 * The leftmost colon demarks the split between the server's hostname
861 * and the export path. If the hostname starts with a left square
862 * bracket, then it may contain colons.
864 * Note: caller frees hostname and export path, even on error.
866 static int nfs_parse_source(struct fs_context *fc,
867 size_t maxnamlen, size_t maxpathlen)
869 struct nfs_fs_context *ctx = nfs_fc2context(fc);
870 const char *dev_name = fc->source;
874 if (unlikely(!dev_name || !*dev_name)) {
875 dfprintk(MOUNT, "NFS: device name not specified\n");
879 /* Is the host name protected with square brakcets? */
880 if (*dev_name == '[') {
881 end = strchr(++dev_name, ']');
882 if (end == NULL || end[1] != ':')
883 goto out_bad_devname;
885 len = end - dev_name;
890 end = strchr(dev_name, ':');
892 goto out_bad_devname;
893 len = end - dev_name;
895 /* kill possible hostname list: not supported */
896 comma = memchr(dev_name, ',', len);
898 len = comma - dev_name;
904 kfree(ctx->nfs_server.hostname);
906 /* N.B. caller will free nfs_server.hostname in all cases */
907 ctx->nfs_server.hostname = kmemdup_nul(dev_name, len, GFP_KERNEL);
908 if (!ctx->nfs_server.hostname)
911 if (len > maxpathlen)
913 ctx->nfs_server.export_path = kmemdup_nul(end, len, GFP_KERNEL);
914 if (!ctx->nfs_server.export_path)
917 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", ctx->nfs_server.export_path);
921 return nfs_invalf(fc, "NFS: device name not in host:path format");
923 nfs_errorf(fc, "NFS: not enough memory to parse device name");
926 nfs_errorf(fc, "NFS: server hostname too long");
927 return -ENAMETOOLONG;
929 nfs_errorf(fc, "NFS: export pathname too long");
930 return -ENAMETOOLONG;
933 static inline bool is_remount_fc(struct fs_context *fc)
935 return fc->root != NULL;
939 * Parse monolithic NFS2/NFS3 mount data
940 * - fills in the mount root filehandle
942 * For option strings, user space handles the following behaviors:
944 * + DNS: mapping server host name to IP address ("addr=" option)
946 * + failure mode: how to behave if a mount request can't be handled
947 * immediately ("fg/bg" option)
949 * + retry: how often to retry a mount request ("retry=" option)
951 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
952 * mountproto=tcp after mountproto=udp, and so on
954 static int nfs23_parse_monolithic(struct fs_context *fc,
955 struct nfs_mount_data *data)
957 struct nfs_fs_context *ctx = nfs_fc2context(fc);
958 struct nfs_fh *mntfh = ctx->mntfh;
959 struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
960 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
966 ctx->version = NFS_DEFAULT_VERSION;
967 switch (data->version) {
975 if (data->flags & NFS_MOUNT_VER3)
977 data->root.size = NFS2_FHSIZE;
978 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
979 /* Turn off security negotiation */
980 extra_flags |= NFS_MOUNT_SECFLAVOUR;
983 if (data->flags & NFS_MOUNT_SECFLAVOUR)
987 memset(data->context, 0, sizeof(data->context));
990 if (data->flags & NFS_MOUNT_VER3) {
991 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
993 mntfh->size = data->root.size;
996 mntfh->size = NFS2_FHSIZE;
1001 memcpy(mntfh->data, data->root.data, mntfh->size);
1002 if (mntfh->size < sizeof(mntfh->data))
1003 memset(mntfh->data + mntfh->size, 0,
1004 sizeof(mntfh->data) - mntfh->size);
1007 * for proto == XPRT_TRANSPORT_UDP, which is what uses
1008 * to_exponential, implying shift: limit the shift value
1009 * to BITS_PER_LONG (majortimeo is unsigned long)
1011 if (!(data->flags & NFS_MOUNT_TCP)) /* this will be UDP */
1012 if (data->retrans >= 64) /* shift value is too large */
1013 goto out_invalid_data;
1016 * Translate to nfs_fs_context, which nfs_fill_super
1019 ctx->flags = data->flags & NFS_MOUNT_FLAGMASK;
1020 ctx->flags |= extra_flags;
1021 ctx->rsize = data->rsize;
1022 ctx->wsize = data->wsize;
1023 ctx->timeo = data->timeo;
1024 ctx->retrans = data->retrans;
1025 ctx->acregmin = data->acregmin;
1026 ctx->acregmax = data->acregmax;
1027 ctx->acdirmin = data->acdirmin;
1028 ctx->acdirmax = data->acdirmax;
1029 ctx->need_mount = false;
1031 memcpy(sap, &data->addr, sizeof(data->addr));
1032 ctx->nfs_server.addrlen = sizeof(data->addr);
1033 ctx->nfs_server.port = ntohs(data->addr.sin_port);
1034 if (sap->sa_family != AF_INET ||
1035 !nfs_verify_server_address(sap))
1036 goto out_no_address;
1038 if (!(data->flags & NFS_MOUNT_TCP))
1039 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1040 /* N.B. caller will free nfs_server.hostname in all cases */
1041 ctx->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1042 if (!ctx->nfs_server.hostname)
1045 ctx->namlen = data->namlen;
1046 ctx->bsize = data->bsize;
1048 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1049 ctx->selected_flavor = data->pseudoflavor;
1051 ctx->selected_flavor = RPC_AUTH_UNIX;
1053 if (!(data->flags & NFS_MOUNT_NONLM))
1054 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1055 NFS_MOUNT_LOCAL_FCNTL);
1057 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1058 NFS_MOUNT_LOCAL_FCNTL);
1061 * The legacy version 6 binary mount data from userspace has a
1062 * field used only to transport selinux information into the
1063 * kernel. To continue to support that functionality we
1064 * have a touch of selinux knowledge here in the NFS code. The
1065 * userspace code converted context=blah to just blah so we are
1066 * converting back to the full string selinux understands.
1068 if (data->context[0]){
1069 #ifdef CONFIG_SECURITY_SELINUX
1072 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1073 ret = vfs_parse_fs_string(fc, "context",
1074 data->context, strlen(data->context));
1087 ret = nfs_validate_transport_protocol(fc, ctx);
1091 ctx->skip_reconfig_option_check = true;
1095 return generic_parse_monolithic(fc, data);
1098 if (is_remount_fc(fc)) {
1099 ctx->skip_reconfig_option_check = true;
1102 return nfs_invalf(fc, "NFS: mount program didn't pass any mount data");
1105 return nfs_invalf(fc, "NFS: nfs_mount_data version does not support v3");
1108 return nfs_invalf(fc, "NFS: nfs_mount_data version supports only AUTH_SYS");
1111 dfprintk(MOUNT, "NFS: not enough memory to handle mount options");
1115 return nfs_invalf(fc, "NFS: mount program didn't pass remote address");
1118 return nfs_invalf(fc, "NFS: invalid root filehandle");
1121 return nfs_invalf(fc, "NFS: invalid binary mount data");
1124 #if IS_ENABLED(CONFIG_NFS_V4)
1125 struct compat_nfs_string {
1130 static inline void compat_nfs_string(struct nfs_string *dst,
1131 struct compat_nfs_string *src)
1133 dst->data = compat_ptr(src->data);
1134 dst->len = src->len;
1137 struct compat_nfs4_mount_data_v1 {
1138 compat_int_t version;
1143 compat_int_t retrans;
1144 compat_int_t acregmin;
1145 compat_int_t acregmax;
1146 compat_int_t acdirmin;
1147 compat_int_t acdirmax;
1148 struct compat_nfs_string client_addr;
1149 struct compat_nfs_string mnt_path;
1150 struct compat_nfs_string hostname;
1151 compat_uint_t host_addrlen;
1152 compat_uptr_t host_addr;
1154 compat_int_t auth_flavourlen;
1155 compat_uptr_t auth_flavours;
1158 static void nfs4_compat_mount_data_conv(struct nfs4_mount_data *data)
1160 struct compat_nfs4_mount_data_v1 *compat =
1161 (struct compat_nfs4_mount_data_v1 *)data;
1163 /* copy the fields backwards */
1164 data->auth_flavours = compat_ptr(compat->auth_flavours);
1165 data->auth_flavourlen = compat->auth_flavourlen;
1166 data->proto = compat->proto;
1167 data->host_addr = compat_ptr(compat->host_addr);
1168 data->host_addrlen = compat->host_addrlen;
1169 compat_nfs_string(&data->hostname, &compat->hostname);
1170 compat_nfs_string(&data->mnt_path, &compat->mnt_path);
1171 compat_nfs_string(&data->client_addr, &compat->client_addr);
1172 data->acdirmax = compat->acdirmax;
1173 data->acdirmin = compat->acdirmin;
1174 data->acregmax = compat->acregmax;
1175 data->acregmin = compat->acregmin;
1176 data->retrans = compat->retrans;
1177 data->timeo = compat->timeo;
1178 data->wsize = compat->wsize;
1179 data->rsize = compat->rsize;
1180 data->flags = compat->flags;
1181 data->version = compat->version;
1185 * Validate NFSv4 mount options
1187 static int nfs4_parse_monolithic(struct fs_context *fc,
1188 struct nfs4_mount_data *data)
1190 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1191 struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
1196 if (is_remount_fc(fc))
1198 return nfs_invalf(fc,
1199 "NFS4: mount program didn't pass any mount data");
1204 if (data->version != 1)
1205 return generic_parse_monolithic(fc, data);
1207 if (in_compat_syscall())
1208 nfs4_compat_mount_data_conv(data);
1210 if (data->host_addrlen > sizeof(ctx->nfs_server.address))
1211 goto out_no_address;
1212 if (data->host_addrlen == 0)
1213 goto out_no_address;
1214 ctx->nfs_server.addrlen = data->host_addrlen;
1215 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
1217 if (!nfs_verify_server_address(sap))
1218 goto out_no_address;
1219 ctx->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
1221 if (data->auth_flavourlen) {
1222 rpc_authflavor_t pseudoflavor;
1224 if (data->auth_flavourlen > 1)
1225 goto out_inval_auth;
1226 if (copy_from_user(&pseudoflavor, data->auth_flavours,
1227 sizeof(pseudoflavor)))
1229 ctx->selected_flavor = pseudoflavor;
1231 ctx->selected_flavor = RPC_AUTH_UNIX;
1234 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1237 ctx->nfs_server.hostname = c;
1239 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1242 ctx->nfs_server.export_path = c;
1243 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1245 c = strndup_user(data->client_addr.data, 16);
1248 ctx->client_address = c;
1251 * Translate to nfs_fs_context, which nfs_fill_super
1255 ctx->flags = data->flags & NFS4_MOUNT_FLAGMASK;
1256 ctx->rsize = data->rsize;
1257 ctx->wsize = data->wsize;
1258 ctx->timeo = data->timeo;
1259 ctx->retrans = data->retrans;
1260 ctx->acregmin = data->acregmin;
1261 ctx->acregmax = data->acregmax;
1262 ctx->acdirmin = data->acdirmin;
1263 ctx->acdirmax = data->acdirmax;
1264 ctx->nfs_server.protocol = data->proto;
1265 ret = nfs_validate_transport_protocol(fc, ctx);
1269 ctx->skip_reconfig_option_check = true;
1273 return nfs_invalf(fc, "NFS4: Invalid number of RPC auth flavours %d",
1274 data->auth_flavourlen);
1277 return nfs_invalf(fc, "NFS4: mount program didn't pass remote address");
1282 * Parse a monolithic block of data from sys_mount().
1284 static int nfs_fs_context_parse_monolithic(struct fs_context *fc,
1287 if (fc->fs_type == &nfs_fs_type)
1288 return nfs23_parse_monolithic(fc, data);
1290 #if IS_ENABLED(CONFIG_NFS_V4)
1291 if (fc->fs_type == &nfs4_fs_type)
1292 return nfs4_parse_monolithic(fc, data);
1295 return nfs_invalf(fc, "NFS: Unsupported monolithic data version");
1299 * Validate the preparsed information in the config.
1301 static int nfs_fs_context_validate(struct fs_context *fc)
1303 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1304 struct nfs_subversion *nfs_mod;
1305 struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
1306 int max_namelen = PAGE_SIZE;
1307 int max_pathlen = NFS_MAXPATHLEN;
1312 goto out_no_device_name;
1314 /* Check for sanity first. */
1315 if (ctx->minorversion && ctx->version != 4)
1316 goto out_minorversion_mismatch;
1318 if (ctx->options & NFS_OPTION_MIGRATION &&
1319 (ctx->version != 4 || ctx->minorversion != 0))
1320 goto out_migration_misuse;
1322 /* Verify that any proto=/mountproto= options match the address
1323 * families in the addr=/mountaddr= options.
1325 if (ctx->protofamily != AF_UNSPEC &&
1326 ctx->protofamily != ctx->nfs_server.address.sa_family)
1327 goto out_proto_mismatch;
1329 if (ctx->mountfamily != AF_UNSPEC) {
1330 if (ctx->mount_server.addrlen) {
1331 if (ctx->mountfamily != ctx->mount_server.address.sa_family)
1332 goto out_mountproto_mismatch;
1334 if (ctx->mountfamily != ctx->nfs_server.address.sa_family)
1335 goto out_mountproto_mismatch;
1339 if (!nfs_verify_server_address(sap))
1340 goto out_no_address;
1342 ret = nfs_validate_transport_protocol(fc, ctx);
1346 if (ctx->version == 4) {
1347 if (IS_ENABLED(CONFIG_NFS_V4)) {
1348 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
1349 port = NFS_RDMA_PORT;
1352 max_namelen = NFS4_MAXNAMLEN;
1353 max_pathlen = NFS4_MAXPATHLEN;
1354 ctx->flags &= ~(NFS_MOUNT_NONLM | NFS_MOUNT_NOACL |
1355 NFS_MOUNT_VER3 | NFS_MOUNT_LOCAL_FLOCK |
1356 NFS_MOUNT_LOCAL_FCNTL);
1358 goto out_v4_not_compiled;
1361 nfs_set_mount_transport_protocol(ctx);
1362 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
1363 port = NFS_RDMA_PORT;
1366 nfs_set_port(sap, &ctx->nfs_server.port, port);
1368 ret = nfs_parse_source(fc, max_namelen, max_pathlen);
1372 /* Load the NFS protocol module if we haven't done so yet */
1373 if (!ctx->nfs_mod) {
1374 nfs_mod = get_nfs_version(ctx->version);
1375 if (IS_ERR(nfs_mod)) {
1376 ret = PTR_ERR(nfs_mod);
1377 goto out_version_unavailable;
1379 ctx->nfs_mod = nfs_mod;
1382 /* Ensure the filesystem context has the correct fs_type */
1383 if (fc->fs_type != ctx->nfs_mod->nfs_fs) {
1384 module_put(fc->fs_type->owner);
1385 __module_get(ctx->nfs_mod->nfs_fs->owner);
1386 fc->fs_type = ctx->nfs_mod->nfs_fs;
1391 return nfs_invalf(fc, "NFS: Device name not specified");
1392 out_v4_not_compiled:
1393 nfs_errorf(fc, "NFS: NFSv4 is not compiled into kernel");
1394 return -EPROTONOSUPPORT;
1396 return nfs_invalf(fc, "NFS: mount program didn't pass remote address");
1397 out_mountproto_mismatch:
1398 return nfs_invalf(fc, "NFS: Mount server address does not match mountproto= option");
1400 return nfs_invalf(fc, "NFS: Server address does not match proto= option");
1401 out_minorversion_mismatch:
1402 return nfs_invalf(fc, "NFS: Mount option vers=%u does not support minorversion=%u",
1403 ctx->version, ctx->minorversion);
1404 out_migration_misuse:
1405 return nfs_invalf(fc, "NFS: 'Migration' not supported for this NFS version");
1406 out_version_unavailable:
1407 nfs_errorf(fc, "NFS: Version unavailable");
1412 * Create an NFS superblock by the appropriate method.
1414 static int nfs_get_tree(struct fs_context *fc)
1416 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1417 int err = nfs_fs_context_validate(fc);
1422 return ctx->nfs_mod->rpc_ops->try_get_tree(fc);
1424 return nfs_get_tree_common(fc);
1428 * Handle duplication of a configuration. The caller copied *src into *sc, but
1429 * it can't deal with resource pointers in the filesystem context, so we have
1430 * to do that. We need to clear pointers, copy data or get extra refs as
1433 static int nfs_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)
1435 struct nfs_fs_context *src = nfs_fc2context(src_fc), *ctx;
1437 ctx = kmemdup(src, sizeof(struct nfs_fs_context), GFP_KERNEL);
1441 ctx->mntfh = nfs_alloc_fhandle();
1446 nfs_copy_fh(ctx->mntfh, src->mntfh);
1448 __module_get(ctx->nfs_mod->owner);
1449 ctx->client_address = NULL;
1450 ctx->mount_server.hostname = NULL;
1451 ctx->nfs_server.export_path = NULL;
1452 ctx->nfs_server.hostname = NULL;
1453 ctx->fscache_uniq = NULL;
1454 ctx->clone_data.fattr = NULL;
1455 fc->fs_private = ctx;
1459 static void nfs_fs_context_free(struct fs_context *fc)
1461 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1465 nfs_free_server(ctx->server);
1467 put_nfs_version(ctx->nfs_mod);
1468 kfree(ctx->client_address);
1469 kfree(ctx->mount_server.hostname);
1470 kfree(ctx->nfs_server.export_path);
1471 kfree(ctx->nfs_server.hostname);
1472 kfree(ctx->fscache_uniq);
1473 nfs_free_fhandle(ctx->mntfh);
1474 nfs_free_fattr(ctx->clone_data.fattr);
1479 static const struct fs_context_operations nfs_fs_context_ops = {
1480 .free = nfs_fs_context_free,
1481 .dup = nfs_fs_context_dup,
1482 .parse_param = nfs_fs_context_parse_param,
1483 .parse_monolithic = nfs_fs_context_parse_monolithic,
1484 .get_tree = nfs_get_tree,
1485 .reconfigure = nfs_reconfigure,
1489 * Prepare superblock configuration. We use the namespaces attached to the
1490 * context. This may be the current process's namespaces, or it may be a
1491 * container's namespaces.
1493 static int nfs_init_fs_context(struct fs_context *fc)
1495 struct nfs_fs_context *ctx;
1497 ctx = kzalloc(sizeof(struct nfs_fs_context), GFP_KERNEL);
1501 ctx->mntfh = nfs_alloc_fhandle();
1502 if (unlikely(!ctx->mntfh)) {
1507 ctx->protofamily = AF_UNSPEC;
1508 ctx->mountfamily = AF_UNSPEC;
1509 ctx->mount_server.port = NFS_UNSPEC_PORT;
1512 /* reconfigure, start with the current config */
1513 struct nfs_server *nfss = fc->root->d_sb->s_fs_info;
1514 struct net *net = nfss->nfs_client->cl_net;
1516 ctx->flags = nfss->flags;
1517 ctx->rsize = nfss->rsize;
1518 ctx->wsize = nfss->wsize;
1519 ctx->retrans = nfss->client->cl_timeout->to_retries;
1520 ctx->selected_flavor = nfss->client->cl_auth->au_flavor;
1521 ctx->acregmin = nfss->acregmin / HZ;
1522 ctx->acregmax = nfss->acregmax / HZ;
1523 ctx->acdirmin = nfss->acdirmin / HZ;
1524 ctx->acdirmax = nfss->acdirmax / HZ;
1525 ctx->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1526 ctx->nfs_server.port = nfss->port;
1527 ctx->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1528 ctx->version = nfss->nfs_client->rpc_ops->version;
1529 ctx->minorversion = nfss->nfs_client->cl_minorversion;
1531 memcpy(&ctx->nfs_server.address, &nfss->nfs_client->cl_addr,
1532 ctx->nfs_server.addrlen);
1534 if (fc->net_ns != net) {
1535 put_net(fc->net_ns);
1536 fc->net_ns = get_net(net);
1539 ctx->nfs_mod = nfss->nfs_client->cl_nfs_mod;
1540 __module_get(ctx->nfs_mod->owner);
1543 ctx->timeo = NFS_UNSPEC_TIMEO;
1544 ctx->retrans = NFS_UNSPEC_RETRANS;
1545 ctx->acregmin = NFS_DEF_ACREGMIN;
1546 ctx->acregmax = NFS_DEF_ACREGMAX;
1547 ctx->acdirmin = NFS_DEF_ACDIRMIN;
1548 ctx->acdirmax = NFS_DEF_ACDIRMAX;
1549 ctx->nfs_server.port = NFS_UNSPEC_PORT;
1550 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1551 ctx->selected_flavor = RPC_AUTH_MAXFLAVOR;
1552 ctx->minorversion = 0;
1553 ctx->need_mount = true;
1555 fc->s_iflags |= SB_I_STABLE_WRITES;
1557 fc->fs_private = ctx;
1558 fc->ops = &nfs_fs_context_ops;
1562 struct file_system_type nfs_fs_type = {
1563 .owner = THIS_MODULE,
1565 .init_fs_context = nfs_init_fs_context,
1566 .parameters = nfs_fs_parameters,
1567 .kill_sb = nfs_kill_super,
1568 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
1570 MODULE_ALIAS_FS("nfs");
1571 EXPORT_SYMBOL_GPL(nfs_fs_type);
1573 #if IS_ENABLED(CONFIG_NFS_V4)
1574 struct file_system_type nfs4_fs_type = {
1575 .owner = THIS_MODULE,
1577 .init_fs_context = nfs_init_fs_context,
1578 .parameters = nfs_fs_parameters,
1579 .kill_sb = nfs_kill_super,
1580 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
1582 MODULE_ALIAS_FS("nfs4");
1583 MODULE_ALIAS("nfs4");
1584 EXPORT_SYMBOL_GPL(nfs4_fs_type);
1585 #endif /* CONFIG_NFS_V4 */