Re: [PATCH v3 16/26] NFS: Move mount parameterisation bits into their own file

Chuck Lever
2019-09-11T18:24:37Z

> On Sep 11, 2019, at 12:16 PM, Scott Mayhew <smayhew@redhat.com> wrote:
>
> From: David Howells <dhowells@redhat.com>
>
> Split various bits relating to mount parameterisation out from
> fs/nfs/super.c into their own file to form the basis of filesystem context
> handling for NFS.
>
> No other changes are made to the code beyond removing 'static' qualifiers.
>
> Signed-off-by: David Howells <dhowells@redhat.com>
> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
> ---
> fs/nfs/Makefile | 2 +-
> fs/nfs/fs_context.c | 1418 +++++++++++++++++++++++++++++++++++++++++++
> fs/nfs/internal.h | 29 +
> fs/nfs/super.c | 1411 ------------------------------------------
> 4 files changed, 1448 insertions(+), 1412 deletions(-)
> create mode 100644 fs/nfs/fs_context.c
>
> diff --git a/fs/nfs/Makefile b/fs/nfs/Makefile
> index 34cdeaecccf6..2433c3e03cfa 100644
> --- a/fs/nfs/Makefile
> +++ b/fs/nfs/Makefile
> @@ -9,7 +9,7 @@ CFLAGS_nfstrace.o += -I$(src)
> nfs-y := client.o dir.o file.o getroot.o inode.o super.o \
> io.o direct.o pagelist.o read.o symlink.o unlink.o \
> write.o namespace.o mount_clnt.o nfstrace.o \
> - export.o sysfs.o
> + export.o sysfs.o fs_context.o
> nfs-$(CONFIG_ROOT_NFS) += nfsroot.o
> nfs-$(CONFIG_SYSCTL) += sysctl.o
> nfs-$(CONFIG_NFS_FSCACHE) += fscache.o fscache-index.o
> diff --git a/fs/nfs/fs_context.c b/fs/nfs/fs_context.c
> new file mode 100644
> index 000000000000..82b312a5cdde
> --- /dev/null
> +++ b/fs/nfs/fs_context.c
> @@ -0,0 +1,1418 @@
> +/* NFS mount handling.
> + *
> + * Copyright (C) 2018 Red Hat, Inc. All Rights Reserved.
> + * Written by David Howells (dhowells@redhat.com)
> + *
> + * Split from fs/nfs/super.c:
> + *
> + * Copyright (C) 1992 Rick Sladkey
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public Licence
> + * as published by the Free Software Foundation; either version
> + * 2 of the Licence, or (at your option) any later version.
> + */

New source files should have an SPDX tag instead of boilerplate.
I suggest:

// SPDX-License-Identifier: GPL-2.0-only

> +
> +#include <linux/module.h>
> +#include <linux/fs.h>
> +#include <linux/parser.h>
> +#include <linux/nfs_fs.h>
> +#include <linux/nfs_mount.h>
> +#include <linux/nfs4_mount.h>
> +#include "nfs.h"
> +#include "internal.h"
> +
> +#define NFSDBG_FACILITY NFSDBG_MOUNT
> +
> +#if IS_ENABLED(CONFIG_NFS_V3)
> +#define NFS_DEFAULT_VERSION 3
> +#else
> +#define NFS_DEFAULT_VERSION 2
> +#endif
> +
> +#define NFS_MAX_CONNECTIONS 16
> +
> +enum {
> + /* Mount options that take no arguments */
> + Opt_soft, Opt_softerr, Opt_hard,
> + Opt_posix, Opt_noposix,
> + Opt_cto, Opt_nocto,
> + Opt_ac, Opt_noac,
> + Opt_lock, Opt_nolock,
> + Opt_udp, Opt_tcp, Opt_rdma,
> + Opt_acl, Opt_noacl,
> + Opt_rdirplus, Opt_nordirplus,
> + Opt_sharecache, Opt_nosharecache,
> + Opt_resvport, Opt_noresvport,
> + Opt_fscache, Opt_nofscache,
> + Opt_migration, Opt_nomigration,
> +
> + /* Mount options that take integer arguments */
> + Opt_port,
> + Opt_rsize, Opt_wsize, Opt_bsize,
> + Opt_timeo, Opt_retrans,
> + Opt_acregmin, Opt_acregmax,
> + Opt_acdirmin, Opt_acdirmax,
> + Opt_actimeo,
> + Opt_namelen,
> + Opt_mountport,
> + Opt_mountvers,
> + Opt_minorversion,
> +
> + /* Mount options that take string arguments */
> + Opt_nfsvers,
> + Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
> + Opt_addr, Opt_mountaddr, Opt_clientaddr,
> + Opt_nconnect,
> + Opt_lookupcache,
> + Opt_fscache_uniq,
> + Opt_local_lock,
> +
> + /* Special mount options */
> + Opt_userspace, Opt_deprecated, Opt_sloppy,
> +
> + Opt_err
> +};
> +
> +static const match_table_t nfs_mount_option_tokens = {
> + { Opt_userspace, "bg" },
> + { Opt_userspace, "fg" },
> + { Opt_userspace, "retry=%s" },
> +
> + { Opt_sloppy, "sloppy" },
> +
> + { Opt_soft, "soft" },
> + { Opt_softerr, "softerr" },
> + { Opt_hard, "hard" },
> + { Opt_deprecated, "intr" },
> + { Opt_deprecated, "nointr" },
> + { Opt_posix, "posix" },
> + { Opt_noposix, "noposix" },
> + { Opt_cto, "cto" },
> + { Opt_nocto, "nocto" },
> + { Opt_ac, "ac" },
> + { Opt_noac, "noac" },
> + { Opt_lock, "lock" },
> + { Opt_nolock, "nolock" },
> + { Opt_udp, "udp" },
> + { Opt_tcp, "tcp" },
> + { Opt_rdma, "rdma" },
> + { Opt_acl, "acl" },
> + { Opt_noacl, "noacl" },
> + { Opt_rdirplus, "rdirplus" },
> + { Opt_nordirplus, "nordirplus" },
> + { Opt_sharecache, "sharecache" },
> + { Opt_nosharecache, "nosharecache" },
> + { Opt_resvport, "resvport" },
> + { Opt_noresvport, "noresvport" },
> + { Opt_fscache, "fsc" },
> + { Opt_nofscache, "nofsc" },
> + { Opt_migration, "migration" },
> + { Opt_nomigration, "nomigration" },
> +
> + { Opt_port, "port=%s" },
> + { Opt_rsize, "rsize=%s" },
> + { Opt_wsize, "wsize=%s" },
> + { Opt_bsize, "bsize=%s" },
> + { Opt_timeo, "timeo=%s" },
> + { Opt_retrans, "retrans=%s" },
> + { Opt_acregmin, "acregmin=%s" },
> + { Opt_acregmax, "acregmax=%s" },
> + { Opt_acdirmin, "acdirmin=%s" },
> + { Opt_acdirmax, "acdirmax=%s" },
> + { Opt_actimeo, "actimeo=%s" },
> + { Opt_namelen, "namlen=%s" },
> + { Opt_mountport, "mountport=%s" },
> + { Opt_mountvers, "mountvers=%s" },
> + { Opt_minorversion, "minorversion=%s" },
> +
> + { Opt_nfsvers, "nfsvers=%s" },
> + { Opt_nfsvers, "vers=%s" },
> +
> + { Opt_sec, "sec=%s" },
> + { Opt_proto, "proto=%s" },
> + { Opt_mountproto, "mountproto=%s" },
> + { Opt_addr, "addr=%s" },
> + { Opt_clientaddr, "clientaddr=%s" },
> + { Opt_mounthost, "mounthost=%s" },
> + { Opt_mountaddr, "mountaddr=%s" },
> +
> + { Opt_nconnect, "nconnect=%s" },
> +
> + { Opt_lookupcache, "lookupcache=%s" },
> + { Opt_fscache_uniq, "fsc=%s" },
> + { Opt_local_lock, "local_lock=%s" },
> +
> + /* The following needs to be listed after all other options */
> + { Opt_nfsvers, "v%s" },
> +
> + { Opt_err, NULL }
> +};
> +
> +enum {
> + Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
> + Opt_xprt_rdma6,
> +
> + Opt_xprt_err
> +};
> +
> +static const match_table_t nfs_xprt_protocol_tokens = {
> + { Opt_xprt_udp, "udp" },
> + { Opt_xprt_udp6, "udp6" },
> + { Opt_xprt_tcp, "tcp" },
> + { Opt_xprt_tcp6, "tcp6" },
> + { Opt_xprt_rdma, "rdma" },
> + { Opt_xprt_rdma6, "rdma6" },
> +
> + { Opt_xprt_err, NULL }
> +};
> +
> +enum {
> + Opt_sec_none, Opt_sec_sys,
> + Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
> + Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
> + Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
> +
> + Opt_sec_err
> +};
> +
> +static const match_table_t nfs_secflavor_tokens = {
> + { Opt_sec_none, "none" },
> + { Opt_sec_none, "null" },
> + { Opt_sec_sys, "sys" },
> +
> + { Opt_sec_krb5, "krb5" },
> + { Opt_sec_krb5i, "krb5i" },
> + { Opt_sec_krb5p, "krb5p" },
> +
> + { Opt_sec_lkey, "lkey" },
> + { Opt_sec_lkeyi, "lkeyi" },
> + { Opt_sec_lkeyp, "lkeyp" },
> +
> + { Opt_sec_spkm, "spkm3" },
> + { Opt_sec_spkmi, "spkm3i" },
> + { Opt_sec_spkmp, "spkm3p" },
> +
> + { Opt_sec_err, NULL }
> +};
> +
> +enum {
> + Opt_lookupcache_all, Opt_lookupcache_positive,
> + Opt_lookupcache_none,
> +
> + Opt_lookupcache_err
> +};
> +
> +static match_table_t nfs_lookupcache_tokens = {
> + { Opt_lookupcache_all, "all" },
> + { Opt_lookupcache_positive, "pos" },
> + { Opt_lookupcache_positive, "positive" },
> + { Opt_lookupcache_none, "none" },
> +
> + { Opt_lookupcache_err, NULL }
> +};
> +
> +enum {
> + Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
> + Opt_local_lock_none,
> +
> + Opt_local_lock_err
> +};
> +
> +static match_table_t nfs_local_lock_tokens = {
> + { Opt_local_lock_all, "all" },
> + { Opt_local_lock_flock, "flock" },
> + { Opt_local_lock_posix, "posix" },
> + { Opt_local_lock_none, "none" },
> +
> + { Opt_local_lock_err, NULL }
> +};
> +
> +enum {
> + Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
> + Opt_vers_4_1, Opt_vers_4_2,
> +
> + Opt_vers_err
> +};
> +
> +static match_table_t nfs_vers_tokens = {
> + { Opt_vers_2, "2" },
> + { Opt_vers_3, "3" },
> + { Opt_vers_4, "4" },
> + { Opt_vers_4_0, "4.0" },
> + { Opt_vers_4_1, "4.1" },
> + { Opt_vers_4_2, "4.2" },
> +
> + { Opt_vers_err, NULL }
> +};
> +
> +struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
> +{
> + struct nfs_parsed_mount_data *data;
> +
> + data = kzalloc(sizeof(*data), GFP_KERNEL);
> + if (data) {
> + data->timeo = NFS_UNSPEC_TIMEO;
> + data->retrans = NFS_UNSPEC_RETRANS;
> + data->acregmin = NFS_DEF_ACREGMIN;
> + data->acregmax = NFS_DEF_ACREGMAX;
> + data->acdirmin = NFS_DEF_ACDIRMIN;
> + data->acdirmax = NFS_DEF_ACDIRMAX;
> + data->mount_server.port = NFS_UNSPEC_PORT;
> + data->nfs_server.port = NFS_UNSPEC_PORT;
> + data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
> + data->selected_flavor = RPC_AUTH_MAXFLAVOR;
> + data->minorversion = 0;
> + data->need_mount = true;
> + data->net = current->nsproxy->net_ns;
> + data->lsm_opts = NULL;
> + }
> + return data;
> +}
> +
> +void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
> +{
> + if (data) {
> + kfree(data->client_address);
> + kfree(data->mount_server.hostname);
> + kfree(data->nfs_server.export_path);
> + kfree(data->nfs_server.hostname);
> + kfree(data->fscache_uniq);
> + security_free_mnt_opts(&data->lsm_opts);
> + kfree(data);
> + }
> +}
> +
> +/*
> + * Sanity-check a server address provided by the mount command.
> + *
> + * Address family must be initialized, and address must not be
> + * the ANY address for that family.
> + */
> +static int nfs_verify_server_address(struct sockaddr *addr)
> +{
> + switch (addr->sa_family) {
> + case AF_INET: {
> + struct sockaddr_in *sa = (struct sockaddr_in *)addr;
> + return sa->sin_addr.s_addr != htonl(INADDR_ANY);
> + }
> + case AF_INET6: {
> + struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
> + return !ipv6_addr_any(sa);
> + }
> + }
> +
> + dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
> + return 0;
> +}
> +
> +/*
> + * Sanity check the NFS transport protocol.
> + *
> + */
> +static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
> +{
> + switch (mnt->nfs_server.protocol) {
> + case XPRT_TRANSPORT_UDP:
> + case XPRT_TRANSPORT_TCP:
> + case XPRT_TRANSPORT_RDMA:
> + break;
> + default:
> + mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
> + }
> +}
> +
> +/*
> + * For text based NFSv2/v3 mounts, the mount protocol transport default
> + * settings should depend upon the specified NFS transport.
> + */
> +static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
> +{
> + nfs_validate_transport_protocol(mnt);
> +
> + if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
> + mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
> + return;
> + switch (mnt->nfs_server.protocol) {
> + case XPRT_TRANSPORT_UDP:
> + mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
> + break;
> + case XPRT_TRANSPORT_TCP:
> + case XPRT_TRANSPORT_RDMA:
> + mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
> + }
> +}
> +
> +/*
> + * Add 'flavor' to 'auth_info' if not already present.
> + * Returns true if 'flavor' ends up in the list, false otherwise
> + */
> +static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
> + rpc_authflavor_t flavor)
> +{
> + unsigned int i;
> + unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
> +
> + /* make sure this flavor isn't already in the list */
> + for (i = 0; i < auth_info->flavor_len; i++) {
> + if (flavor == auth_info->flavors[i])
> + return true;
> + }
> +
> + if (auth_info->flavor_len + 1 >= max_flavor_len) {
> + dfprintk(MOUNT, "NFS: too many sec= flavors\n");
> + return false;
> + }
> +
> + auth_info->flavors[auth_info->flavor_len++] = flavor;
> + return true;
> +}
> +
> +/*
> + * Parse the value of the 'sec=' option.
> + */
> +static int nfs_parse_security_flavors(char *value,
> + struct nfs_parsed_mount_data *mnt)
> +{
> + substring_t args[MAX_OPT_ARGS];
> + rpc_authflavor_t pseudoflavor;
> + char *p;
> +
> + dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
> +
> + while ((p = strsep(&value, ":")) != NULL) {
> + switch (match_token(p, nfs_secflavor_tokens, args)) {
> + case Opt_sec_none:
> + pseudoflavor = RPC_AUTH_NULL;
> + break;
> + case Opt_sec_sys:
> + pseudoflavor = RPC_AUTH_UNIX;
> + break;
> + case Opt_sec_krb5:
> + pseudoflavor = RPC_AUTH_GSS_KRB5;
> + break;
> + case Opt_sec_krb5i:
> + pseudoflavor = RPC_AUTH_GSS_KRB5I;
> + break;
> + case Opt_sec_krb5p:
> + pseudoflavor = RPC_AUTH_GSS_KRB5P;
> + break;
> + case Opt_sec_lkey:
> + pseudoflavor = RPC_AUTH_GSS_LKEY;
> + break;
> + case Opt_sec_lkeyi:
> + pseudoflavor = RPC_AUTH_GSS_LKEYI;
> + break;
> + case Opt_sec_lkeyp:
> + pseudoflavor = RPC_AUTH_GSS_LKEYP;
> + break;
> + case Opt_sec_spkm:
> + pseudoflavor = RPC_AUTH_GSS_SPKM;
> + break;
> + case Opt_sec_spkmi:
> + pseudoflavor = RPC_AUTH_GSS_SPKMI;
> + break;
> + case Opt_sec_spkmp:
> + pseudoflavor = RPC_AUTH_GSS_SPKMP;
> + break;
> + default:
> + dfprintk(MOUNT,
> + "NFS: sec= option '%s' not recognized\n", p);
> + return 0;
> + }
> +
> + if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
> + return 0;
> + }
> +
> + return 1;
> +}
> +
> +static int nfs_parse_version_string(char *string,
> + struct nfs_parsed_mount_data *mnt,
> + substring_t *args)
> +{
> + mnt->flags &= ~NFS_MOUNT_VER3;
> + switch (match_token(string, nfs_vers_tokens, args)) {
> + case Opt_vers_2:
> + mnt->version = 2;
> + break;
> + case Opt_vers_3:
> + mnt->flags |= NFS_MOUNT_VER3;
> + mnt->version = 3;
> + break;
> + case Opt_vers_4:
> + /* Backward compatibility option. In future,
> + * the mount program should always supply
> + * a NFSv4 minor version number.
> + */
> + mnt->version = 4;
> + break;
> + case Opt_vers_4_0:
> + mnt->version = 4;
> + mnt->minorversion = 0;
> + break;
> + case Opt_vers_4_1:
> + mnt->version = 4;
> + mnt->minorversion = 1;
> + break;
> + case Opt_vers_4_2:
> + mnt->version = 4;
> + mnt->minorversion = 2;
> + break;
> + default:
> + return 0;
> + }
> + return 1;
> +}
> +
> +static int nfs_get_option_str(substring_t args[], char **option)
> +{
> + kfree(*option);
> + *option = match_strdup(args);
> + return !*option;
> +}
> +
> +static int nfs_get_option_ul(substring_t args[], unsigned long *option)
> +{
> + int rc;
> + char *string;
> +
> + string = match_strdup(args);
> + if (string == NULL)
> + return -ENOMEM;
> + rc = kstrtoul(string, 10, option);
> + kfree(string);
> +
> + return rc;
> +}
> +
> +static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option,
> + unsigned long l_bound, unsigned long u_bound)
> +{
> + int ret;
> +
> + ret = nfs_get_option_ul(args, option);
> + if (ret != 0)
> + return ret;
> + if (*option < l_bound || *option > u_bound)
> + return -ERANGE;
> + return 0;
> +}
> +
> +/*
> + * Error-check and convert a string of mount options from user space into
> + * a data structure. The whole mount string is processed; bad options are
> + * skipped as they are encountered. If there were no errors, return 1;
> + * otherwise return 0 (zero).
> + */
> +int nfs_parse_mount_options(char *raw, struct nfs_parsed_mount_data *mnt)
> +{
> + char *p, *string;
> + int rc, sloppy = 0, invalid_option = 0;
> + unsigned short protofamily = AF_UNSPEC;
> + unsigned short mountfamily = AF_UNSPEC;
> +
> + if (!raw) {
> + dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
> + return 1;
> + }
> + dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
> +
> + rc = security_sb_eat_lsm_opts(raw, &mnt->lsm_opts);
> + if (rc)
> + goto out_security_failure;
> +
> + while ((p = strsep(&raw, ",")) != NULL) {
> + substring_t args[MAX_OPT_ARGS];
> + unsigned long option;
> + int token;
> +
> + if (!*p)
> + continue;
> +
> + dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
> +
> + token = match_token(p, nfs_mount_option_tokens, args);
> + switch (token) {
> +
> + /*
> + * boolean options: foo/nofoo
> + */
> + case Opt_soft:
> + mnt->flags |= NFS_MOUNT_SOFT;
> + mnt->flags &= ~NFS_MOUNT_SOFTERR;
> + break;
> + case Opt_softerr:
> + mnt->flags |= NFS_MOUNT_SOFTERR;
> + mnt->flags &= ~NFS_MOUNT_SOFT;
> + break;
> + case Opt_hard:
> + mnt->flags &= ~(NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR);
> + break;
> + case Opt_posix:
> + mnt->flags |= NFS_MOUNT_POSIX;
> + break;
> + case Opt_noposix:
> + mnt->flags &= ~NFS_MOUNT_POSIX;
> + break;
> + case Opt_cto:
> + mnt->flags &= ~NFS_MOUNT_NOCTO;
> + break;
> + case Opt_nocto:
> + mnt->flags |= NFS_MOUNT_NOCTO;
> + break;
> + case Opt_ac:
> + mnt->flags &= ~NFS_MOUNT_NOAC;
> + break;
> + case Opt_noac:
> + mnt->flags |= NFS_MOUNT_NOAC;
> + break;
> + case Opt_lock:
> + mnt->flags &= ~NFS_MOUNT_NONLM;
> + mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
> + NFS_MOUNT_LOCAL_FCNTL);
> + break;
> + case Opt_nolock:
> + mnt->flags |= NFS_MOUNT_NONLM;
> + mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
> + NFS_MOUNT_LOCAL_FCNTL);
> + break;
> + case Opt_udp:
> + mnt->flags &= ~NFS_MOUNT_TCP;
> + mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
> + break;
> + case Opt_tcp:
> + mnt->flags |= NFS_MOUNT_TCP;
> + mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
> + break;
> + case Opt_rdma:
> + mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
> + mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
> + xprt_load_transport(p);
> + break;
> + case Opt_acl:
> + mnt->flags &= ~NFS_MOUNT_NOACL;
> + break;
> + case Opt_noacl:
> + mnt->flags |= NFS_MOUNT_NOACL;
> + break;
> + case Opt_rdirplus:
> + mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
> + break;
> + case Opt_nordirplus:
> + mnt->flags |= NFS_MOUNT_NORDIRPLUS;
> + break;
> + case Opt_sharecache:
> + mnt->flags &= ~NFS_MOUNT_UNSHARED;
> + break;
> + case Opt_nosharecache:
> + mnt->flags |= NFS_MOUNT_UNSHARED;
> + break;
> + case Opt_resvport:
> + mnt->flags &= ~NFS_MOUNT_NORESVPORT;
> + break;
> + case Opt_noresvport:
> + mnt->flags |= NFS_MOUNT_NORESVPORT;
> + break;
> + case Opt_fscache:
> + mnt->options |= NFS_OPTION_FSCACHE;
> + kfree(mnt->fscache_uniq);
> + mnt->fscache_uniq = NULL;
> + break;
> + case Opt_nofscache:
> + mnt->options &= ~NFS_OPTION_FSCACHE;
> + kfree(mnt->fscache_uniq);
> + mnt->fscache_uniq = NULL;
> + break;
> + case Opt_migration:
> + mnt->options |= NFS_OPTION_MIGRATION;
> + break;
> + case Opt_nomigration:
> + mnt->options &= ~NFS_OPTION_MIGRATION;
> + break;
> +
> + /*
> + * options that take numeric values
> + */
> + case Opt_port:
> + if (nfs_get_option_ul(args, &option) ||
> + option > USHRT_MAX)
> + goto out_invalid_value;
> + mnt->nfs_server.port = option;
> + break;
> + case Opt_rsize:
> + if (nfs_get_option_ul(args, &option))
> + goto out_invalid_value;
> + mnt->rsize = option;
> + break;
> + case Opt_wsize:
> + if (nfs_get_option_ul(args, &option))
> + goto out_invalid_value;
> + mnt->wsize = option;
> + break;
> + case Opt_bsize:
> + if (nfs_get_option_ul(args, &option))
> + goto out_invalid_value;
> + mnt->bsize = option;
> + break;
> + case Opt_timeo:
> + if (nfs_get_option_ul_bound(args, &option, 1, INT_MAX))
> + goto out_invalid_value;
> + mnt->timeo = option;
> + break;
> + case Opt_retrans:
> + if (nfs_get_option_ul_bound(args, &option, 0, INT_MAX))
> + goto out_invalid_value;
> + mnt->retrans = option;
> + break;
> + case Opt_acregmin:
> + if (nfs_get_option_ul(args, &option))
> + goto out_invalid_value;
> + mnt->acregmin = option;
> + break;
> + case Opt_acregmax:
> + if (nfs_get_option_ul(args, &option))
> + goto out_invalid_value;
> + mnt->acregmax = option;
> + break;
> + case Opt_acdirmin:
> + if (nfs_get_option_ul(args, &option))
> + goto out_invalid_value;
> + mnt->acdirmin = option;
> + break;
> + case Opt_acdirmax:
> + if (nfs_get_option_ul(args, &option))
> + goto out_invalid_value;
> + mnt->acdirmax = option;
> + break;
> + case Opt_actimeo:
> + if (nfs_get_option_ul(args, &option))
> + goto out_invalid_value;
> + mnt->acregmin = mnt->acregmax =
> + mnt->acdirmin = mnt->acdirmax = option;
> + break;
> + case Opt_namelen:
> + if (nfs_get_option_ul(args, &option))
> + goto out_invalid_value;
> + mnt->namlen = option;
> + break;
> + case Opt_mountport:
> + if (nfs_get_option_ul(args, &option) ||
> + option > USHRT_MAX)
> + goto out_invalid_value;
> + mnt->mount_server.port = option;
> + break;
> + case Opt_mountvers:
> + if (nfs_get_option_ul(args, &option) ||
> + option < NFS_MNT_VERSION ||
> + option > NFS_MNT3_VERSION)
> + goto out_invalid_value;
> + mnt->mount_server.version = option;
> + break;
> + case Opt_minorversion:
> + if (nfs_get_option_ul(args, &option))
> + goto out_invalid_value;
> + if (option > NFS4_MAX_MINOR_VERSION)
> + goto out_invalid_value;
> + mnt->minorversion = option;
> + break;
> +
> + /*
> + * options that take text values
> + */
> + case Opt_nfsvers:
> + string = match_strdup(args);
> + if (string == NULL)
> + goto out_nomem;
> + rc = nfs_parse_version_string(string, mnt, args);
> + kfree(string);
> + if (!rc)
> + goto out_invalid_value;
> + break;
> + case Opt_sec:
> + string = match_strdup(args);
> + if (string == NULL)
> + goto out_nomem;
> + rc = nfs_parse_security_flavors(string, mnt);
> + kfree(string);
> + if (!rc) {
> + dfprintk(MOUNT, "NFS: unrecognized "
> + "security flavor\n");
> + return 0;
> + }
> + break;
> + case Opt_proto:
> + string = match_strdup(args);
> + if (string == NULL)
> + goto out_nomem;
> + token = match_token(string,
> + nfs_xprt_protocol_tokens, args);
> +
> + protofamily = AF_INET;
> + switch (token) {
> + case Opt_xprt_udp6:
> + protofamily = AF_INET6;
> + /* fall through */
> + case Opt_xprt_udp:
> + mnt->flags &= ~NFS_MOUNT_TCP;
> + mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
> + break;
> + case Opt_xprt_tcp6:
> + protofamily = AF_INET6;
> + /* fall through */
> + case Opt_xprt_tcp:
> + mnt->flags |= NFS_MOUNT_TCP;
> + mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
> + break;
> + case Opt_xprt_rdma6:
> + protofamily = AF_INET6;
> + /* fall through */
> + case Opt_xprt_rdma:
> + /* vector side protocols to TCP */
> + mnt->flags |= NFS_MOUNT_TCP;
> + mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
> + xprt_load_transport(string);
> + break;
> + default:
> + dfprintk(MOUNT, "NFS: unrecognized "
> + "transport protocol\n");
> + kfree(string);
> + return 0;
> + }
> + kfree(string);
> + break;
> + case Opt_mountproto:
> + string = match_strdup(args);
> + if (string == NULL)
> + goto out_nomem;
> + token = match_token(string,
> + nfs_xprt_protocol_tokens, args);
> + kfree(string);
> +
> + mountfamily = AF_INET;
> + switch (token) {
> + case Opt_xprt_udp6:
> + mountfamily = AF_INET6;
> + /* fall through */
> + case Opt_xprt_udp:
> + mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
> + break;
> + case Opt_xprt_tcp6:
> + mountfamily = AF_INET6;
> + /* fall through */
> + case Opt_xprt_tcp:
> + mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
> + break;
> + case Opt_xprt_rdma: /* not used for side protocols */
> + default:
> + dfprintk(MOUNT, "NFS: unrecognized "
> + "transport protocol\n");
> + return 0;
> + }
> + break;
> + case Opt_addr:
> + string = match_strdup(args);
> + if (string == NULL)
> + goto out_nomem;
> + mnt->nfs_server.addrlen =
> + rpc_pton(mnt->net, string, strlen(string),
> + (struct sockaddr *)
> + &mnt->nfs_server.address,
> + sizeof(mnt->nfs_server.address));
> + kfree(string);
> + if (mnt->nfs_server.addrlen == 0)
> + goto out_invalid_address;
> + break;
> + case Opt_clientaddr:
> + if (nfs_get_option_str(args, &mnt->client_address))
> + goto out_nomem;
> + break;
> + case Opt_mounthost:
> + if (nfs_get_option_str(args,
> + &mnt->mount_server.hostname))
> + goto out_nomem;
> + break;
> + case Opt_mountaddr:
> + string = match_strdup(args);
> + if (string == NULL)
> + goto out_nomem;
> + mnt->mount_server.addrlen =
> + rpc_pton(mnt->net, string, strlen(string),
> + (struct sockaddr *)
> + &mnt->mount_server.address,
> + sizeof(mnt->mount_server.address));
> + kfree(string);
> + if (mnt->mount_server.addrlen == 0)
> + goto out_invalid_address;
> + break;
> + case Opt_nconnect:
> + if (nfs_get_option_ul_bound(args, &option, 1, NFS_MAX_CONNECTIONS))
> + goto out_invalid_value;
> + mnt->nfs_server.nconnect = option;
> + break;
> + case Opt_lookupcache:
> + string = match_strdup(args);
> + if (string == NULL)
> + goto out_nomem;
> + token = match_token(string,
> + nfs_lookupcache_tokens, args);
> + kfree(string);
> + switch (token) {
> + case Opt_lookupcache_all:
> + mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
> + break;
> + case Opt_lookupcache_positive:
> + mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
> + mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
> + break;
> + case Opt_lookupcache_none:
> + mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
> + break;
> + default:
> + dfprintk(MOUNT, "NFS: invalid "
> + "lookupcache argument\n");
> + return 0;
> + };
> + break;
> + case Opt_fscache_uniq:
> + if (nfs_get_option_str(args, &mnt->fscache_uniq))
> + goto out_nomem;
> + mnt->options |= NFS_OPTION_FSCACHE;
> + break;
> + case Opt_local_lock:
> + string = match_strdup(args);
> + if (string == NULL)
> + goto out_nomem;
> + token = match_token(string, nfs_local_lock_tokens,
> + args);
> + kfree(string);
> + switch (token) {
> + case Opt_local_lock_all:
> + mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
> + NFS_MOUNT_LOCAL_FCNTL);
> + break;
> + case Opt_local_lock_flock:
> + mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
> + break;
> + case Opt_local_lock_posix:
> + mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
> + break;
> + case Opt_local_lock_none:
> + mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
> + NFS_MOUNT_LOCAL_FCNTL);
> + break;
> + default:
> + dfprintk(MOUNT, "NFS: invalid "
> + "local_lock argument\n");
> + return 0;
> + };
> + break;
> +
> + /*
> + * Special options
> + */
> + case Opt_sloppy:
> + sloppy = 1;
> + dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
> + break;
> + case Opt_userspace:
> + case Opt_deprecated:
> + dfprintk(MOUNT, "NFS: ignoring mount option "
> + "'%s'\n", p);
> + break;
> +
> + default:
> + invalid_option = 1;
> + dfprintk(MOUNT, "NFS: unrecognized mount option "
> + "'%s'\n", p);
> + }
> + }
> +
> + if (!sloppy && invalid_option)
> + return 0;
> +
> + if (mnt->minorversion && mnt->version != 4)
> + goto out_minorversion_mismatch;
> +
> + if (mnt->options & NFS_OPTION_MIGRATION &&
> + (mnt->version != 4 || mnt->minorversion != 0))
> + goto out_migration_misuse;
> +
> + /*
> + * verify that any proto=/mountproto= options match the address
> + * families in the addr=/mountaddr= options.
> + */
> + if (protofamily != AF_UNSPEC &&
> + protofamily != mnt->nfs_server.address.ss_family)
> + goto out_proto_mismatch;
> +
> + if (mountfamily != AF_UNSPEC) {
> + if (mnt->mount_server.addrlen) {
> + if (mountfamily != mnt->mount_server.address.ss_family)
> + goto out_mountproto_mismatch;
> + } else {
> + if (mountfamily != mnt->nfs_server.address.ss_family)
> + goto out_mountproto_mismatch;
> + }
> + }
> +
> + return 1;
> +
> +out_mountproto_mismatch:
> + printk(KERN_INFO "NFS: mount server address does not match mountproto= "
> + "option\n");
> + return 0;
> +out_proto_mismatch:
> + printk(KERN_INFO "NFS: server address does not match proto= option\n");
> + return 0;
> +out_invalid_address:
> + printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
> + return 0;
> +out_invalid_value:
> + printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
> + return 0;
> +out_minorversion_mismatch:
> + printk(KERN_INFO "NFS: mount option vers=%u does not support "
> + "minorversion=%u\n", mnt->version, mnt->minorversion);
> + return 0;
> +out_migration_misuse:
> + printk(KERN_INFO
> + "NFS: 'migration' not supported for this NFS version\n");
> + return 0;
> +out_nomem:
> + printk(KERN_INFO "NFS: not enough memory to parse option\n");
> + return 0;
> +out_security_failure:
> + printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
> + return 0;
> +}
> +
> +/*
> + * Split "dev_name" into "hostname:export_path".
> + *
> + * The leftmost colon demarks the split between the server's hostname
> + * and the export path. If the hostname starts with a left square
> + * bracket, then it may contain colons.
> + *
> + * Note: caller frees hostname and export path, even on error.
> + */
> +static int nfs_parse_devname(const char *dev_name,
> + char **hostname, size_t maxnamlen,
> + char **export_path, size_t maxpathlen)
> +{
> + size_t len;
> + char *end;
> +
> + if (unlikely(!dev_name || !*dev_name)) {
> + dfprintk(MOUNT, "NFS: device name not specified\n");
> + return -EINVAL;
> + }
> +
> + /* Is the host name protected with square brakcets? */
> + if (*dev_name == '[') {
> + end = strchr(++dev_name, ']');
> + if (end == NULL || end[1] != ':')
> + goto out_bad_devname;
> +
> + len = end - dev_name;
> + end++;
> + } else {
> + char *comma;
> +
> + end = strchr(dev_name, ':');
> + if (end == NULL)
> + goto out_bad_devname;
> + len = end - dev_name;
> +
> + /* kill possible hostname list: not supported */
> + comma = strchr(dev_name, ',');
> + if (comma != NULL && comma < end)
> + len = comma - dev_name;
> + }
> +
> + if (len > maxnamlen)
> + goto out_hostname;
> +
> + /* N.B. caller will free nfs_server.hostname in all cases */
> + *hostname = kstrndup(dev_name, len, GFP_KERNEL);
> + if (*hostname == NULL)
> + goto out_nomem;
> + len = strlen(++end);
> + if (len > maxpathlen)
> + goto out_path;
> + *export_path = kstrndup(end, len, GFP_KERNEL);
> + if (!*export_path)
> + goto out_nomem;
> +
> + dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
> + return 0;
> +
> +out_bad_devname:
> + dfprintk(MOUNT, "NFS: device name not in host:path format\n");
> + return -EINVAL;
> +
> +out_nomem:
> + dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
> + return -ENOMEM;
> +
> +out_hostname:
> + dfprintk(MOUNT, "NFS: server hostname too long\n");
> + return -ENAMETOOLONG;
> +
> +out_path:
> + dfprintk(MOUNT, "NFS: export pathname too long\n");
> + return -ENAMETOOLONG;
> +}
> +
> +/*
> + * Validate the NFS2/NFS3 mount data
> + * - fills in the mount root filehandle
> + *
> + * For option strings, user space handles the following behaviors:
> + *
> + * + DNS: mapping server host name to IP address ("addr=" option)
> + *
> + * + failure mode: how to behave if a mount request can't be handled
> + * immediately ("fg/bg" option)
> + *
> + * + retry: how often to retry a mount request ("retry=" option)
> + *
> + * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
> + * mountproto=tcp after mountproto=udp, and so on
> + */
> +static int nfs23_validate_mount_data(void *options,
> + struct nfs_parsed_mount_data *args,
> + struct nfs_fh *mntfh,
> + const char *dev_name)
> +{
> + struct nfs_mount_data *data = (struct nfs_mount_data *)options;
> + struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
> + int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
> +
> + if (data == NULL)
> + goto out_no_data;
> +
> + args->version = NFS_DEFAULT_VERSION;
> + switch (data->version) {
> + case 1:
> + data->namlen = 0; /* fall through */
> + case 2:
> + data->bsize = 0; /* fall through */
> + case 3:
> + if (data->flags & NFS_MOUNT_VER3)
> + goto out_no_v3;
> + data->root.size = NFS2_FHSIZE;
> + memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
> + /* Turn off security negotiation */
> + extra_flags |= NFS_MOUNT_SECFLAVOUR;
> + /* fall through */
> + case 4:
> + if (data->flags & NFS_MOUNT_SECFLAVOUR)
> + goto out_no_sec;
> + /* fall through */
> + case 5:
> + memset(data->context, 0, sizeof(data->context));
> + /* fall through */
> + case 6:
> + if (data->flags & NFS_MOUNT_VER3) {
> + if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
> + goto out_invalid_fh;
> + mntfh->size = data->root.size;
> + args->version = 3;
> + } else {
> + mntfh->size = NFS2_FHSIZE;
> + args->version = 2;
> + }
> +
> +
> + memcpy(mntfh->data, data->root.data, mntfh->size);
> + if (mntfh->size < sizeof(mntfh->data))
> + memset(mntfh->data + mntfh->size, 0,
> + sizeof(mntfh->data) - mntfh->size);
> +
> + /*
> + * Translate to nfs_parsed_mount_data, which nfs_fill_super
> + * can deal with.
> + */
> + args->flags = data->flags & NFS_MOUNT_FLAGMASK;
> + args->flags |= extra_flags;
> + args->rsize = data->rsize;
> + args->wsize = data->wsize;
> + args->timeo = data->timeo;
> + args->retrans = data->retrans;
> + args->acregmin = data->acregmin;
> + args->acregmax = data->acregmax;
> + args->acdirmin = data->acdirmin;
> + args->acdirmax = data->acdirmax;
> + args->need_mount = false;
> +
> + memcpy(sap, &data->addr, sizeof(data->addr));
> + args->nfs_server.addrlen = sizeof(data->addr);
> + args->nfs_server.port = ntohs(data->addr.sin_port);
> + if (sap->sa_family != AF_INET ||
> + !nfs_verify_server_address(sap))
> + goto out_no_address;
> +
> + if (!(data->flags & NFS_MOUNT_TCP))
> + args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
> + /* N.B. caller will free nfs_server.hostname in all cases */
> + args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
> + args->namlen = data->namlen;
> + args->bsize = data->bsize;
> +
> + if (data->flags & NFS_MOUNT_SECFLAVOUR)
> + args->selected_flavor = data->pseudoflavor;
> + else
> + args->selected_flavor = RPC_AUTH_UNIX;
> + if (!args->nfs_server.hostname)
> + goto out_nomem;
> +
> + if (!(data->flags & NFS_MOUNT_NONLM))
> + args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
> + NFS_MOUNT_LOCAL_FCNTL);
> + else
> + args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
> + NFS_MOUNT_LOCAL_FCNTL);
> + /*
> + * The legacy version 6 binary mount data from userspace has a
> + * field used only to transport selinux information into the
> + * the kernel. To continue to support that functionality we
> + * have a touch of selinux knowledge here in the NFS code. The
> + * userspace code converted context=blah to just blah so we are
> + * converting back to the full string selinux understands.
> + */
> + if (data->context[0]){
> +#ifdef CONFIG_SECURITY_SELINUX
> + int rc;
> + data->context[NFS_MAX_CONTEXT_LEN] = '\0';
> + rc = security_add_mnt_opt("context", data->context,
> + strlen(data->context), &args->lsm_opts);
> + if (rc)
> + return rc;
> +#else
> + return -EINVAL;
> +#endif
> + }
> +
> + break;
> + default:
> + return NFS_TEXT_DATA;
> + }
> +
> + return 0;
> +
> +out_no_data:
> + dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
> + return -EINVAL;
> +
> +out_no_v3:
> + dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
> + data->version);
> + return -EINVAL;
> +
> +out_no_sec:
> + dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
> + return -EINVAL;
> +
> +out_nomem:
> + dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
> + return -ENOMEM;
> +
> +out_no_address:
> + dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
> + return -EINVAL;
> +
> +out_invalid_fh:
> + dfprintk(MOUNT, "NFS: invalid root filehandle\n");
> + return -EINVAL;
> +}
> +
> +#if IS_ENABLED(CONFIG_NFS_V4)
> +
> +static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
> +{
> + args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
> + NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
> +}
> +
> +/*
> + * Validate NFSv4 mount options
> + */
> +static int nfs4_validate_mount_data(void *options,
> + struct nfs_parsed_mount_data *args,
> + const char *dev_name)
> +{
> + struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
> + struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
> + char *c;
> +
> + if (data == NULL)
> + goto out_no_data;
> +
> + args->version = 4;
> +
> + switch (data->version) {
> + case 1:
> + if (data->host_addrlen > sizeof(args->nfs_server.address))
> + goto out_no_address;
> + if (data->host_addrlen == 0)
> + goto out_no_address;
> + args->nfs_server.addrlen = data->host_addrlen;
> + if (copy_from_user(sap, data->host_addr, data->host_addrlen))
> + return -EFAULT;
> + if (!nfs_verify_server_address(sap))
> + goto out_no_address;
> + args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
> +
> + if (data->auth_flavourlen) {
> + rpc_authflavor_t pseudoflavor;
> + if (data->auth_flavourlen > 1)
> + goto out_inval_auth;
> + if (copy_from_user(&pseudoflavor,
> + data->auth_flavours,
> + sizeof(pseudoflavor)))
> + return -EFAULT;
> + args->selected_flavor = pseudoflavor;
> + } else
> + args->selected_flavor = RPC_AUTH_UNIX;
> +
> + c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
> + if (IS_ERR(c))
> + return PTR_ERR(c);
> + args->nfs_server.hostname = c;
> +
> + c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
> + if (IS_ERR(c))
> + return PTR_ERR(c);
> + args->nfs_server.export_path = c;
> + dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
> +
> + c = strndup_user(data->client_addr.data, 16);
> + if (IS_ERR(c))
> + return PTR_ERR(c);
> + args->client_address = c;
> +
> + /*
> + * Translate to nfs_parsed_mount_data, which nfs4_fill_super
> + * can deal with.
> + */
> +
> + args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
> + args->rsize = data->rsize;
> + args->wsize = data->wsize;
> + args->timeo = data->timeo;
> + args->retrans = data->retrans;
> + args->acregmin = data->acregmin;
> + args->acregmax = data->acregmax;
> + args->acdirmin = data->acdirmin;
> + args->acdirmax = data->acdirmax;
> + args->nfs_server.protocol = data->proto;
> + nfs_validate_transport_protocol(args);
> + if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
> + goto out_invalid_transport_udp;
> +
> + break;
> + default:
> + return NFS_TEXT_DATA;
> + }
> +
> + return 0;
> +
> +out_no_data:
> + dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
> + return -EINVAL;
> +
> +out_inval_auth:
> + dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
> + data->auth_flavourlen);
> + return -EINVAL;
> +
> +out_no_address:
> + dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
> + return -EINVAL;
> +
> +out_invalid_transport_udp:
> + dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
> + return -EINVAL;
> +}
> +
> +int nfs_validate_mount_data(struct file_system_type *fs_type,
> + void *options,
> + struct nfs_parsed_mount_data *args,
> + struct nfs_fh *mntfh,
> + const char *dev_name)
> +{
> + if (fs_type == &nfs_fs_type)
> + return nfs23_validate_mount_data(options, args, mntfh, dev_name);
> + return nfs4_validate_mount_data(options, args, dev_name);
> +}
> +#else
> +int nfs_validate_mount_data(struct file_system_type *fs_type,
> + void *options,
> + struct nfs_parsed_mount_data *args,
> + struct nfs_fh *mntfh,
> + const char *dev_name)
> +{
> + return nfs23_validate_mount_data(options, args, mntfh, dev_name);
> +}
> +#endif
> +
> +int nfs_validate_text_mount_data(void *options,
> + struct nfs_parsed_mount_data *args,
> + const char *dev_name)
> +{
> + int port = 0;
> + int max_namelen = PAGE_SIZE;
> + int max_pathlen = NFS_MAXPATHLEN;
> + struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
> +
> + if (nfs_parse_mount_options((char *)options, args) == 0)
> + return -EINVAL;
> +
> + if (!nfs_verify_server_address(sap))
> + goto out_no_address;
> +
> + if (args->version == 4) {
> +#if IS_ENABLED(CONFIG_NFS_V4)
> + if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
> + port = NFS_RDMA_PORT;
> + else
> + port = NFS_PORT;
> + max_namelen = NFS4_MAXNAMLEN;
> + max_pathlen = NFS4_MAXPATHLEN;
> + nfs_validate_transport_protocol(args);
> + if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
> + goto out_invalid_transport_udp;
> + nfs4_validate_mount_flags(args);
> +#else
> + goto out_v4_not_compiled;
> +#endif /* CONFIG_NFS_V4 */
> + } else {
> + nfs_set_mount_transport_protocol(args);
> + if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
> + port = NFS_RDMA_PORT;
> + }
> +
> + nfs_set_port(sap, &args->nfs_server.port, port);
> +
> + return nfs_parse_devname(dev_name,
> + &args->nfs_server.hostname,
> + max_namelen,
> + &args->nfs_server.export_path,
> + max_pathlen);
> +
> +#if !IS_ENABLED(CONFIG_NFS_V4)
> +out_v4_not_compiled:
> + dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
> + return -EPROTONOSUPPORT;
> +#else
> +out_invalid_transport_udp:
> + dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
> + return -EINVAL;
> +#endif /* !CONFIG_NFS_V4 */
> +
> +out_no_address:
> + dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
> + return -EINVAL;
> +}
> diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
> index d512ec394559..b66fd35993b3 100644
> --- a/fs/nfs/internal.h
> +++ b/fs/nfs/internal.h
> @@ -7,6 +7,7 @@
> #include <linux/mount.h>
> #include <linux/security.h>
> #include <linux/crc32.h>
> +#include <linux/sunrpc/addr.h>
> #include <linux/nfs_page.h>
> #include <linux/wait_bit.h>
>
> @@ -232,6 +233,22 @@ extern const struct svc_version nfs4_callback_version1;
> extern const struct svc_version nfs4_callback_version4;
>
> struct nfs_pageio_descriptor;
> +
> +/* mount.c */
> +#define NFS_TEXT_DATA 1
> +
> +extern struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void);
> +extern void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data);
> +extern int nfs_parse_mount_options(char *raw, struct nfs_parsed_mount_data *mnt);
> +extern int nfs_validate_mount_data(struct file_system_type *fs_type,
> + void *options,
> + struct nfs_parsed_mount_data *args,
> + struct nfs_fh *mntfh,
> + const char *dev_name);
> +extern int nfs_validate_text_mount_data(void *options,
> + struct nfs_parsed_mount_data *args,
> + const char *dev_name);
> +
> /* pagelist.c */
> extern int __init nfs_init_nfspagecache(void);
> extern void nfs_destroy_nfspagecache(void);
> @@ -763,3 +780,15 @@ static inline bool nfs_error_is_fatal(int err)
> }
> }
>
> +/*
> + * Select between a default port value and a user-specified port value.
> + * If a zero value is set, then autobind will be used.
> + */
> +static inline void nfs_set_port(struct sockaddr *sap, int *port,
> + const unsigned short default_port)
> +{
> + if (*port == NFS_UNSPEC_PORT)
> + *port = default_port;
> +
> + rpc_set_port(sap, *port);
> +}
> diff --git a/fs/nfs/super.c b/fs/nfs/super.c
> index d8702e57f7fc..886220d2da4e 100644
> --- a/fs/nfs/super.c
> +++ b/fs/nfs/super.c
> @@ -69,229 +69,6 @@
> #include "nfs.h"
>
> #define NFSDBG_FACILITY NFSDBG_VFS
> -#define NFS_TEXT_DATA 1
> -
> -#if IS_ENABLED(CONFIG_NFS_V3)
> -#define NFS_DEFAULT_VERSION 3
> -#else
> -#define NFS_DEFAULT_VERSION 2
> -#endif
> -
> -#define NFS_MAX_CONNECTIONS 16
> -
> -enum {
> - /* Mount options that take no arguments */
> - Opt_soft, Opt_softerr, Opt_hard,
> - Opt_posix, Opt_noposix,
> - Opt_cto, Opt_nocto,
> - Opt_ac, Opt_noac,
> - Opt_lock, Opt_nolock,
> - Opt_udp, Opt_tcp, Opt_rdma,
> - Opt_acl, Opt_noacl,
> - Opt_rdirplus, Opt_nordirplus,
> - Opt_sharecache, Opt_nosharecache,
> - Opt_resvport, Opt_noresvport,
> - Opt_fscache, Opt_nofscache,
> - Opt_migration, Opt_nomigration,
> -
> - /* Mount options that take integer arguments */
> - Opt_port,
> - Opt_rsize, Opt_wsize, Opt_bsize,
> - Opt_timeo, Opt_retrans,
> - Opt_acregmin, Opt_acregmax,
> - Opt_acdirmin, Opt_acdirmax,
> - Opt_actimeo,
> - Opt_namelen,
> - Opt_mountport,
> - Opt_mountvers,
> - Opt_minorversion,
> -
> - /* Mount options that take string arguments */
> - Opt_nfsvers,
> - Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
> - Opt_addr, Opt_mountaddr, Opt_clientaddr,
> - Opt_nconnect,
> - Opt_lookupcache,
> - Opt_fscache_uniq,
> - Opt_local_lock,
> -
> - /* Special mount options */
> - Opt_userspace, Opt_deprecated, Opt_sloppy,
> -
> - Opt_err
> -};
> -
> -static const match_table_t nfs_mount_option_tokens = {
> - { Opt_userspace, "bg" },
> - { Opt_userspace, "fg" },
> - { Opt_userspace, "retry=%s" },
> -
> - { Opt_sloppy, "sloppy" },
> -
> - { Opt_soft, "soft" },
> - { Opt_softerr, "softerr" },
> - { Opt_hard, "hard" },
> - { Opt_deprecated, "intr" },
> - { Opt_deprecated, "nointr" },
> - { Opt_posix, "posix" },
> - { Opt_noposix, "noposix" },
> - { Opt_cto, "cto" },
> - { Opt_nocto, "nocto" },
> - { Opt_ac, "ac" },
> - { Opt_noac, "noac" },
> - { Opt_lock, "lock" },
> - { Opt_nolock, "nolock" },
> - { Opt_udp, "udp" },
> - { Opt_tcp, "tcp" },
> - { Opt_rdma, "rdma" },
> - { Opt_acl, "acl" },
> - { Opt_noacl, "noacl" },
> - { Opt_rdirplus, "rdirplus" },
> - { Opt_nordirplus, "nordirplus" },
> - { Opt_sharecache, "sharecache" },
> - { Opt_nosharecache, "nosharecache" },
> - { Opt_resvport, "resvport" },
> - { Opt_noresvport, "noresvport" },
> - { Opt_fscache, "fsc" },
> - { Opt_nofscache, "nofsc" },
> - { Opt_migration, "migration" },
> - { Opt_nomigration, "nomigration" },
> -
> - { Opt_port, "port=%s" },
> - { Opt_rsize, "rsize=%s" },
> - { Opt_wsize, "wsize=%s" },
> - { Opt_bsize, "bsize=%s" },
> - { Opt_timeo, "timeo=%s" },
> - { Opt_retrans, "retrans=%s" },
> - { Opt_acregmin, "acregmin=%s" },
> - { Opt_acregmax, "acregmax=%s" },
> - { Opt_acdirmin, "acdirmin=%s" },
> - { Opt_acdirmax, "acdirmax=%s" },
> - { Opt_actimeo, "actimeo=%s" },
> - { Opt_namelen, "namlen=%s" },
> - { Opt_mountport, "mountport=%s" },
> - { Opt_mountvers, "mountvers=%s" },
> - { Opt_minorversion, "minorversion=%s" },
> -
> - { Opt_nfsvers, "nfsvers=%s" },
> - { Opt_nfsvers, "vers=%s" },
> -
> - { Opt_sec, "sec=%s" },
> - { Opt_proto, "proto=%s" },
> - { Opt_mountproto, "mountproto=%s" },
> - { Opt_addr, "addr=%s" },
> - { Opt_clientaddr, "clientaddr=%s" },
> - { Opt_mounthost, "mounthost=%s" },
> - { Opt_mountaddr, "mountaddr=%s" },
> -
> - { Opt_nconnect, "nconnect=%s" },
> -
> - { Opt_lookupcache, "lookupcache=%s" },
> - { Opt_fscache_uniq, "fsc=%s" },
> - { Opt_local_lock, "local_lock=%s" },
> -
> - /* The following needs to be listed after all other options */
> - { Opt_nfsvers, "v%s" },
> -
> - { Opt_err, NULL }
> -};
> -
> -enum {
> - Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
> - Opt_xprt_rdma6,
> -
> - Opt_xprt_err
> -};
> -
> -static const match_table_t nfs_xprt_protocol_tokens = {
> - { Opt_xprt_udp, "udp" },
> - { Opt_xprt_udp6, "udp6" },
> - { Opt_xprt_tcp, "tcp" },
> - { Opt_xprt_tcp6, "tcp6" },
> - { Opt_xprt_rdma, "rdma" },
> - { Opt_xprt_rdma6, "rdma6" },
> -
> - { Opt_xprt_err, NULL }
> -};
> -
> -enum {
> - Opt_sec_none, Opt_sec_sys,
> - Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
> - Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
> - Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
> -
> - Opt_sec_err
> -};
> -
> -static const match_table_t nfs_secflavor_tokens = {
> - { Opt_sec_none, "none" },
> - { Opt_sec_none, "null" },
> - { Opt_sec_sys, "sys" },
> -
> - { Opt_sec_krb5, "krb5" },
> - { Opt_sec_krb5i, "krb5i" },
> - { Opt_sec_krb5p, "krb5p" },
> -
> - { Opt_sec_lkey, "lkey" },
> - { Opt_sec_lkeyi, "lkeyi" },
> - { Opt_sec_lkeyp, "lkeyp" },
> -
> - { Opt_sec_spkm, "spkm3" },
> - { Opt_sec_spkmi, "spkm3i" },
> - { Opt_sec_spkmp, "spkm3p" },
> -
> - { Opt_sec_err, NULL }
> -};
> -
> -enum {
> - Opt_lookupcache_all, Opt_lookupcache_positive,
> - Opt_lookupcache_none,
> -
> - Opt_lookupcache_err
> -};
> -
> -static match_table_t nfs_lookupcache_tokens = {
> - { Opt_lookupcache_all, "all" },
> - { Opt_lookupcache_positive, "pos" },
> - { Opt_lookupcache_positive, "positive" },
> - { Opt_lookupcache_none, "none" },
> -
> - { Opt_lookupcache_err, NULL }
> -};
> -
> -enum {
> - Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
> - Opt_local_lock_none,
> -
> - Opt_local_lock_err
> -};
> -
> -static match_table_t nfs_local_lock_tokens = {
> - { Opt_local_lock_all, "all" },
> - { Opt_local_lock_flock, "flock" },
> - { Opt_local_lock_posix, "posix" },
> - { Opt_local_lock_none, "none" },
> -
> - { Opt_local_lock_err, NULL }
> -};
> -
> -enum {
> - Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
> - Opt_vers_4_1, Opt_vers_4_2,
> -
> - Opt_vers_err
> -};
> -
> -static match_table_t nfs_vers_tokens = {
> - { Opt_vers_2, "2" },
> - { Opt_vers_3, "3" },
> - { Opt_vers_4, "4" },
> - { Opt_vers_4_0, "4.0" },
> - { Opt_vers_4_1, "4.1" },
> - { Opt_vers_4_2, "4.2" },
> -
> - { Opt_vers_err, NULL }
> -};
>
> static struct dentry *nfs_prepared_mount(struct file_system_type *fs_type,
> int flags, const char *dev_name, void *raw_data);
> @@ -332,10 +109,6 @@ const struct super_operations nfs_sops = {
> EXPORT_SYMBOL_GPL(nfs_sops);
>
> #if IS_ENABLED(CONFIG_NFS_V4)
> -static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
> -static int nfs4_validate_mount_data(void *options,
> - struct nfs_parsed_mount_data *args, const char *dev_name);
> -
> struct file_system_type nfs4_fs_type = {
> .owner = THIS_MODULE,
> .name = "nfs4",
> @@ -932,141 +705,6 @@ void nfs_umount_begin(struct super_block *sb)
> }
> EXPORT_SYMBOL_GPL(nfs_umount_begin);
>
> -static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
> -{
> - struct nfs_parsed_mount_data *data;
> -
> - data = kzalloc(sizeof(*data), GFP_KERNEL);
> - if (data) {
> - data->timeo = NFS_UNSPEC_TIMEO;
> - data->retrans = NFS_UNSPEC_RETRANS;
> - data->acregmin = NFS_DEF_ACREGMIN;
> - data->acregmax = NFS_DEF_ACREGMAX;
> - data->acdirmin = NFS_DEF_ACDIRMIN;
> - data->acdirmax = NFS_DEF_ACDIRMAX;
> - data->mount_server.port = NFS_UNSPEC_PORT;
> - data->nfs_server.port = NFS_UNSPEC_PORT;
> - data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
> - data->selected_flavor = RPC_AUTH_MAXFLAVOR;
> - data->minorversion = 0;
> - data->need_mount = true;
> - data->net = current->nsproxy->net_ns;
> - data->lsm_opts = NULL;
> - }
> - return data;
> -}
> -
> -static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
> -{
> - if (data) {
> - kfree(data->client_address);
> - kfree(data->mount_server.hostname);
> - kfree(data->nfs_server.export_path);
> - kfree(data->nfs_server.hostname);
> - kfree(data->fscache_uniq);
> - security_free_mnt_opts(&data->lsm_opts);
> - kfree(data);
> - }
> -}
> -
> -/*
> - * Sanity-check a server address provided by the mount command.
> - *
> - * Address family must be initialized, and address must not be
> - * the ANY address for that family.
> - */
> -static int nfs_verify_server_address(struct sockaddr *addr)
> -{
> - switch (addr->sa_family) {
> - case AF_INET: {
> - struct sockaddr_in *sa = (struct sockaddr_in *)addr;
> - return sa->sin_addr.s_addr != htonl(INADDR_ANY);
> - }
> - case AF_INET6: {
> - struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
> - return !ipv6_addr_any(sa);
> - }
> - }
> -
> - dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
> - return 0;
> -}
> -
> -/*
> - * Select between a default port value and a user-specified port value.
> - * If a zero value is set, then autobind will be used.
> - */
> -static void nfs_set_port(struct sockaddr *sap, int *port,
> - const unsigned short default_port)
> -{
> - if (*port == NFS_UNSPEC_PORT)
> - *port = default_port;
> -
> - rpc_set_port(sap, *port);
> -}
> -
> -/*
> - * Sanity check the NFS transport protocol.
> - *
> - */
> -static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
> -{
> - switch (mnt->nfs_server.protocol) {
> - case XPRT_TRANSPORT_UDP:
> - case XPRT_TRANSPORT_TCP:
> - case XPRT_TRANSPORT_RDMA:
> - break;
> - default:
> - mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
> - }
> -}
> -
> -/*
> - * For text based NFSv2/v3 mounts, the mount protocol transport default
> - * settings should depend upon the specified NFS transport.
> - */
> -static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
> -{
> - nfs_validate_transport_protocol(mnt);
> -
> - if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
> - mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
> - return;
> - switch (mnt->nfs_server.protocol) {
> - case XPRT_TRANSPORT_UDP:
> - mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
> - break;
> - case XPRT_TRANSPORT_TCP:
> - case XPRT_TRANSPORT_RDMA:
> - mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
> - }
> -}
> -
> -/*
> - * Add 'flavor' to 'auth_info' if not already present.
> - * Returns true if 'flavor' ends up in the list, false otherwise
> - */
> -static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
> - rpc_authflavor_t flavor)
> -{
> - unsigned int i;
> - unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
> -
> - /* make sure this flavor isn't already in the list */
> - for (i = 0; i < auth_info->flavor_len; i++) {
> - if (flavor == auth_info->flavors[i])
> - return true;
> - }
> -
> - if (auth_info->flavor_len + 1 >= max_flavor_len) {
> - dfprintk(MOUNT, "NFS: too many sec= flavors\n");
> - return false;
> - }
> -
> - auth_info->flavors[auth_info->flavor_len++] = flavor;
> - return true;
> -}
> -
> /*
> * Return true if 'match' is in auth_info or auth_info is empty.
> * Return false otherwise.
> @@ -1087,627 +725,6 @@ bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
> }
> EXPORT_SYMBOL_GPL(nfs_auth_info_match);
>
> -/*
> - * Parse the value of the 'sec=' option.
> - */
> -static int nfs_parse_security_flavors(char *value,
> - struct nfs_parsed_mount_data *mnt)
> -{
> - substring_t args[MAX_OPT_ARGS];
> - rpc_authflavor_t pseudoflavor;
> - char *p;
> -
> - dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
> -
> - while ((p = strsep(&value, ":")) != NULL) {
> - switch (match_token(p, nfs_secflavor_tokens, args)) {
> - case Opt_sec_none:
> - pseudoflavor = RPC_AUTH_NULL;
> - break;
> - case Opt_sec_sys:
> - pseudoflavor = RPC_AUTH_UNIX;
> - break;
> - case Opt_sec_krb5:
> - pseudoflavor = RPC_AUTH_GSS_KRB5;
> - break;
> - case Opt_sec_krb5i:
> - pseudoflavor = RPC_AUTH_GSS_KRB5I;
> - break;
> - case Opt_sec_krb5p:
> - pseudoflavor = RPC_AUTH_GSS_KRB5P;
> - break;
> - case Opt_sec_lkey:
> - pseudoflavor = RPC_AUTH_GSS_LKEY;
> - break;
> - case Opt_sec_lkeyi:
> - pseudoflavor = RPC_AUTH_GSS_LKEYI;
> - break;
> - case Opt_sec_lkeyp:
> - pseudoflavor = RPC_AUTH_GSS_LKEYP;
> - break;
> - case Opt_sec_spkm:
> - pseudoflavor = RPC_AUTH_GSS_SPKM;
> - break;
> - case Opt_sec_spkmi:
> - pseudoflavor = RPC_AUTH_GSS_SPKMI;
> - break;
> - case Opt_sec_spkmp:
> - pseudoflavor = RPC_AUTH_GSS_SPKMP;
> - break;
> - default:
> - dfprintk(MOUNT,
> - "NFS: sec= option '%s' not recognized\n", p);
> - return 0;
> - }
> -
> - if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
> - return 0;
> - }
> -
> - return 1;
> -}
> -
> -static int nfs_parse_version_string(char *string,
> - struct nfs_parsed_mount_data *mnt,
> - substring_t *args)
> -{
> - mnt->flags &= ~NFS_MOUNT_VER3;
> - switch (match_token(string, nfs_vers_tokens, args)) {
> - case Opt_vers_2:
> - mnt->version = 2;
> - break;
> - case Opt_vers_3:
> - mnt->flags |= NFS_MOUNT_VER3;
> - mnt->version = 3;
> - break;
> - case Opt_vers_4:
> - /* Backward compatibility option. In future,
> - * the mount program should always supply
> - * a NFSv4 minor version number.
> - */
> - mnt->version = 4;
> - break;
> - case Opt_vers_4_0:
> - mnt->version = 4;
> - mnt->minorversion = 0;
> - break;
> - case Opt_vers_4_1:
> - mnt->version = 4;
> - mnt->minorversion = 1;
> - break;
> - case Opt_vers_4_2:
> - mnt->version = 4;
> - mnt->minorversion = 2;
> - break;
> - default:
> - return 0;
> - }
> - return 1;
> -}
> -
> -static int nfs_get_option_str(substring_t args[], char **option)
> -{
> - kfree(*option);
> - *option = match_strdup(args);
> - return !*option;
> -}
> -
> -static int nfs_get_option_ul(substring_t args[], unsigned long *option)
> -{
> - int rc;
> - char *string;
> -
> - string = match_strdup(args);
> - if (string == NULL)
> - return -ENOMEM;
> - rc = kstrtoul(string, 10, option);
> - kfree(string);
> -
> - return rc;
> -}
> -
> -static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option,
> - unsigned long l_bound, unsigned long u_bound)
> -{
> - int ret;
> -
> - ret = nfs_get_option_ul(args, option);
> - if (ret != 0)
> - return ret;
> - if (*option < l_bound || *option > u_bound)
> - return -ERANGE;
> - return 0;
> -}
> -
> -/*
> - * Error-check and convert a string of mount options from user space into
> - * a data structure. The whole mount string is processed; bad options are
> - * skipped as they are encountered. If there were no errors, return 1;
> - * otherwise return 0 (zero).
> - */
> -static int nfs_parse_mount_options(char *raw,
> - struct nfs_parsed_mount_data *mnt)
> -{
> - char *p, *string;
> - int rc, sloppy = 0, invalid_option = 0;
> - unsigned short protofamily = AF_UNSPEC;
> - unsigned short mountfamily = AF_UNSPEC;
> -
> - if (!raw) {
> - dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
> - return 1;
> - }
> - dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
> -
> - rc = security_sb_eat_lsm_opts(raw, &mnt->lsm_opts);
> - if (rc)
> - goto out_security_failure;
> -
> - while ((p = strsep(&raw, ",")) != NULL) {
> - substring_t args[MAX_OPT_ARGS];
> - unsigned long option;
> - int token;
> -
> - if (!*p)
> - continue;
> -
> - dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
> -
> - token = match_token(p, nfs_mount_option_tokens, args);
> - switch (token) {
> -
> - /*
> - * boolean options: foo/nofoo
> - */
> - case Opt_soft:
> - mnt->flags |= NFS_MOUNT_SOFT;
> - mnt->flags &= ~NFS_MOUNT_SOFTERR;
> - break;
> - case Opt_softerr:
> - mnt->flags |= NFS_MOUNT_SOFTERR;
> - mnt->flags &= ~NFS_MOUNT_SOFT;
> - break;
> - case Opt_hard:
> - mnt->flags &= ~(NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR);
> - break;
> - case Opt_posix:
> - mnt->flags |= NFS_MOUNT_POSIX;
> - break;
> - case Opt_noposix:
> - mnt->flags &= ~NFS_MOUNT_POSIX;
> - break;
> - case Opt_cto:
> - mnt->flags &= ~NFS_MOUNT_NOCTO;
> - break;
> - case Opt_nocto:
> - mnt->flags |= NFS_MOUNT_NOCTO;
> - break;
> - case Opt_ac:
> - mnt->flags &= ~NFS_MOUNT_NOAC;
> - break;
> - case Opt_noac:
> - mnt->flags |= NFS_MOUNT_NOAC;
> - break;
> - case Opt_lock:
> - mnt->flags &= ~NFS_MOUNT_NONLM;
> - mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
> - NFS_MOUNT_LOCAL_FCNTL);
> - break;
> - case Opt_nolock:
> - mnt->flags |= NFS_MOUNT_NONLM;
> - mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
> - NFS_MOUNT_LOCAL_FCNTL);
> - break;
> - case Opt_udp:
> - mnt->flags &= ~NFS_MOUNT_TCP;
> - mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
> - break;
> - case Opt_tcp:
> - mnt->flags |= NFS_MOUNT_TCP;
> - mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
> - break;
> - case Opt_rdma:
> - mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
> - mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
> - xprt_load_transport(p);
> - break;
> - case Opt_acl:
> - mnt->flags &= ~NFS_MOUNT_NOACL;
> - break;
> - case Opt_noacl:
> - mnt->flags |= NFS_MOUNT_NOACL;
> - break;
> - case Opt_rdirplus:
> - mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
> - break;
> - case Opt_nordirplus:
> - mnt->flags |= NFS_MOUNT_NORDIRPLUS;
> - break;
> - case Opt_sharecache:
> - mnt->flags &= ~NFS_MOUNT_UNSHARED;
> - break;
> - case Opt_nosharecache:
> - mnt->flags |= NFS_MOUNT_UNSHARED;
> - break;
> - case Opt_resvport:
> - mnt->flags &= ~NFS_MOUNT_NORESVPORT;
> - break;
> - case Opt_noresvport:
> - mnt->flags |= NFS_MOUNT_NORESVPORT;
> - break;
> - case Opt_fscache:
> - mnt->options |= NFS_OPTION_FSCACHE;
> - kfree(mnt->fscache_uniq);
> - mnt->fscache_uniq = NULL;
> - break;
> - case Opt_nofscache:
> - mnt->options &= ~NFS_OPTION_FSCACHE;
> - kfree(mnt->fscache_uniq);
> - mnt->fscache_uniq = NULL;
> - break;
> - case Opt_migration:
> - mnt->options |= NFS_OPTION_MIGRATION;
> - break;
> - case Opt_nomigration:
> - mnt->options &= ~NFS_OPTION_MIGRATION;
> - break;
> -
> - /*
> - * options that take numeric values
> - */
> - case Opt_port:
> - if (nfs_get_option_ul(args, &option) ||
> - option > USHRT_MAX)
> - goto out_invalid_value;
> - mnt->nfs_server.port = option;
> - break;
> - case Opt_rsize:
> - if (nfs_get_option_ul(args, &option))
> - goto out_invalid_value;
> - mnt->rsize = option;
> - break;
> - case Opt_wsize:
> - if (nfs_get_option_ul(args, &option))
> - goto out_invalid_value;
> - mnt->wsize = option;
> - break;
> - case Opt_bsize:
> - if (nfs_get_option_ul(args, &option))
> - goto out_invalid_value;
> - mnt->bsize = option;
> - break;
> - case Opt_timeo:
> - if (nfs_get_option_ul_bound(args, &option, 1, INT_MAX))
> - goto out_invalid_value;
> - mnt->timeo = option;
> - break;
> - case Opt_retrans:
> - if (nfs_get_option_ul_bound(args, &option, 0, INT_MAX))
> - goto out_invalid_value;
> - mnt->retrans = option;
> - break;
> - case Opt_acregmin:
> - if (nfs_get_option_ul(args, &option))
> - goto out_invalid_value;
> - mnt->acregmin = option;
> - break;
> - case Opt_acregmax:
> - if (nfs_get_option_ul(args, &option))
> - goto out_invalid_value;
> - mnt->acregmax = option;
> - break;
> - case Opt_acdirmin:
> - if (nfs_get_option_ul(args, &option))
> - goto out_invalid_value;
> - mnt->acdirmin = option;
> - break;
> - case Opt_acdirmax:
> - if (nfs_get_option_ul(args, &option))
> - goto out_invalid_value;
> - mnt->acdirmax = option;
> - break;
> - case Opt_actimeo:
> - if (nfs_get_option_ul(args, &option))
> - goto out_invalid_value;
> - mnt->acregmin = mnt->acregmax =
> - mnt->acdirmin = mnt->acdirmax = option;
> - break;
> - case Opt_namelen:
> - if (nfs_get_option_ul(args, &option))
> - goto out_invalid_value;
> - mnt->namlen = option;
> - break;
> - case Opt_mountport:
> - if (nfs_get_option_ul(args, &option) ||
> - option > USHRT_MAX)
> - goto out_invalid_value;
> - mnt->mount_server.port = option;
> - break;
> - case Opt_mountvers:
> - if (nfs_get_option_ul(args, &option) ||
> - option < NFS_MNT_VERSION ||
> - option > NFS_MNT3_VERSION)
> - goto out_invalid_value;
> - mnt->mount_server.version = option;
> - break;
> - case Opt_minorversion:
> - if (nfs_get_option_ul(args, &option))
> - goto out_invalid_value;
> - if (option > NFS4_MAX_MINOR_VERSION)
> - goto out_invalid_value;
> - mnt->minorversion = option;
> - break;
> -
> - /*
> - * options that take text values
> - */
> - case Opt_nfsvers:
> - string = match_strdup(args);
> - if (string == NULL)
> - goto out_nomem;
> - rc = nfs_parse_version_string(string, mnt, args);
> - kfree(string);
> - if (!rc)
> - goto out_invalid_value;
> - break;
> - case Opt_sec:
> - string = match_strdup(args);
> - if (string == NULL)
> - goto out_nomem;
> - rc = nfs_parse_security_flavors(string, mnt);
> - kfree(string);
> - if (!rc) {
> - dfprintk(MOUNT, "NFS: unrecognized "
> - "security flavor\n");
> - return 0;
> - }
> - break;
> - case Opt_proto:
> - string = match_strdup(args);
> - if (string == NULL)
> - goto out_nomem;
> - token = match_token(string,
> - nfs_xprt_protocol_tokens, args);
> -
> - protofamily = AF_INET;
> - switch (token) {
> - case Opt_xprt_udp6:
> - protofamily = AF_INET6;
> - /* fall through */
> - case Opt_xprt_udp:
> - mnt->flags &= ~NFS_MOUNT_TCP;
> - mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
> - break;
> - case Opt_xprt_tcp6:
> - protofamily = AF_INET6;
> - /* fall through */
> - case Opt_xprt_tcp:
> - mnt->flags |= NFS_MOUNT_TCP;
> - mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
> - break;
> - case Opt_xprt_rdma6:
> - protofamily = AF_INET6;
> - /* fall through */
> - case Opt_xprt_rdma:
> - /* vector side protocols to TCP */
> - mnt->flags |= NFS_MOUNT_TCP;
> - mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
> - xprt_load_transport(string);
> - break;
> - default:
> - dfprintk(MOUNT, "NFS: unrecognized "
> - "transport protocol\n");
> - kfree(string);
> - return 0;
> - }
> - kfree(string);
> - break;
> - case Opt_mountproto:
> - string = match_strdup(args);
> - if (string == NULL)
> - goto out_nomem;
> - token = match_token(string,
> - nfs_xprt_protocol_tokens, args);
> - kfree(string);
> -
> - mountfamily = AF_INET;
> - switch (token) {
> - case Opt_xprt_udp6:
> - mountfamily = AF_INET6;
> - /* fall through */
> - case Opt_xprt_udp:
> - mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
> - break;
> - case Opt_xprt_tcp6:
> - mountfamily = AF_INET6;
> - /* fall through */
> - case Opt_xprt_tcp:
> - mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
> - break;
> - case Opt_xprt_rdma: /* not used for side protocols */
> - default:
> - dfprintk(MOUNT, "NFS: unrecognized "
> - "transport protocol\n");
> - return 0;
> - }
> - break;
> - case Opt_addr:
> - string = match_strdup(args);
> - if (string == NULL)
> - goto out_nomem;
> - mnt->nfs_server.addrlen =
> - rpc_pton(mnt->net, string, strlen(string),
> - (struct sockaddr *)
> - &mnt->nfs_server.address,
> - sizeof(mnt->nfs_server.address));
> - kfree(string);
> - if (mnt->nfs_server.addrlen == 0)
> - goto out_invalid_address;
> - break;
> - case Opt_clientaddr:
> - if (nfs_get_option_str(args, &mnt->client_address))
> - goto out_nomem;
> - break;
> - case Opt_mounthost:
> - if (nfs_get_option_str(args,
> - &mnt->mount_server.hostname))
> - goto out_nomem;
> - break;
> - case Opt_mountaddr:
> - string = match_strdup(args);
> - if (string == NULL)
> - goto out_nomem;
> - mnt->mount_server.addrlen =
> - rpc_pton(mnt->net, string, strlen(string),
> - (struct sockaddr *)
> - &mnt->mount_server.address,
> - sizeof(mnt->mount_server.address));
> - kfree(string);
> - if (mnt->mount_server.addrlen == 0)
> - goto out_invalid_address;
> - break;
> - case Opt_nconnect:
> - if (nfs_get_option_ul_bound(args, &option, 1, NFS_MAX_CONNECTIONS))
> - goto out_invalid_value;
> - mnt->nfs_server.nconnect = option;
> - break;
> - case Opt_lookupcache:
> - string = match_strdup(args);
> - if (string == NULL)
> - goto out_nomem;
> - token = match_token(string,
> - nfs_lookupcache_tokens, args);
> - kfree(string);
> - switch (token) {
> - case Opt_lookupcache_all:
> - mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
> - break;
> - case Opt_lookupcache_positive:
> - mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
> - mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
> - break;
> - case Opt_lookupcache_none:
> - mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
> - break;
> - default:
> - dfprintk(MOUNT, "NFS: invalid "
> - "lookupcache argument\n");
> - return 0;
> - };
> - break;
> - case Opt_fscache_uniq:
> - if (nfs_get_option_str(args, &mnt->fscache_uniq))
> - goto out_nomem;
> - mnt->options |= NFS_OPTION_FSCACHE;
> - break;
> - case Opt_local_lock:
> - string = match_strdup(args);
> - if (string == NULL)
> - goto out_nomem;
> - token = match_token(string, nfs_local_lock_tokens,
> - args);
> - kfree(string);
> - switch (token) {
> - case Opt_local_lock_all:
> - mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
> - NFS_MOUNT_LOCAL_FCNTL);
> - break;
> - case Opt_local_lock_flock:
> - mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
> - break;
> - case Opt_local_lock_posix:
> - mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
> - break;
> - case Opt_local_lock_none:
> - mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
> - NFS_MOUNT_LOCAL_FCNTL);
> - break;
> - default:
> - dfprintk(MOUNT, "NFS: invalid "
> - "local_lock argument\n");
> - return 0;
> - };
> - break;
> -
> - /*
> - * Special options
> - */
> - case Opt_sloppy:
> - sloppy = 1;
> - dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
> - break;
> - case Opt_userspace:
> - case Opt_deprecated:
> - dfprintk(MOUNT, "NFS: ignoring mount option "
> - "'%s'\n", p);
> - break;
> -
> - default:
> - invalid_option = 1;
> - dfprintk(MOUNT, "NFS: unrecognized mount option "
> - "'%s'\n", p);
> - }
> - }
> -
> - if (!sloppy && invalid_option)
> - return 0;
> -
> - if (mnt->minorversion && mnt->version != 4)
> - goto out_minorversion_mismatch;
> -
> - if (mnt->options & NFS_OPTION_MIGRATION &&
> - (mnt->version != 4 || mnt->minorversion != 0))
> - goto out_migration_misuse;
> -
> - /*
> - * verify that any proto=/mountproto= options match the address
> - * families in the addr=/mountaddr= options.
> - */
> - if (protofamily != AF_UNSPEC &&
> - protofamily != mnt->nfs_server.address.ss_family)
> - goto out_proto_mismatch;
> -
> - if (mountfamily != AF_UNSPEC) {
> - if (mnt->mount_server.addrlen) {
> - if (mountfamily != mnt->mount_server.address.ss_family)
> - goto out_mountproto_mismatch;
> - } else {
> - if (mountfamily != mnt->nfs_server.address.ss_family)
> - goto out_mountproto_mismatch;
> - }
> - }
> -
> - return 1;
> -
> -out_mountproto_mismatch:
> - printk(KERN_INFO "NFS: mount server address does not match mountproto= "
> - "option\n");
> - return 0;
> -out_proto_mismatch:
> - printk(KERN_INFO "NFS: server address does not match proto= option\n");
> - return 0;
> -out_invalid_address:
> - printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
> - return 0;
> -out_invalid_value:
> - printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
> - return 0;
> -out_minorversion_mismatch:
> - printk(KERN_INFO "NFS: mount option vers=%u does not support "
> - "minorversion=%u\n", mnt->version, mnt->minorversion);
> - return 0;
> -out_migration_misuse:
> - printk(KERN_INFO
> - "NFS: 'migration' not supported for this NFS version\n");
> - return 0;
> -out_nomem:
> - printk(KERN_INFO "NFS: not enough memory to parse option\n");
> - return 0;
> -out_security_failure:
> - printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
> - return 0;
> -}
> -
> /*
> * Ensure that a specified authtype in args->auth_info is supported by
> * the server. Returns 0 and sets args->selected_flavor if it's ok, and
> @@ -1908,327 +925,6 @@ struct dentry *nfs_try_mount(int flags, const char *dev_name,
> }
> EXPORT_SYMBOL_GPL(nfs_try_mount);
>
> -/*
> - * Split "dev_name" into "hostname:export_path".
> - *
> - * The leftmost colon demarks the split between the server's hostname
> - * and the export path. If the hostname starts with a left square
> - * bracket, then it may contain colons.
> - *
> - * Note: caller frees hostname and export path, even on error.
> - */
> -static int nfs_parse_devname(const char *dev_name,
> - char **hostname, size_t maxnamlen,
> - char **export_path, size_t maxpathlen)
> -{
> - size_t len;
> - char *end;
> -
> - if (unlikely(!dev_name || !*dev_name)) {
> - dfprintk(MOUNT, "NFS: device name not specified\n");
> - return -EINVAL;
> - }
> -
> - /* Is the host name protected with square brakcets? */
> - if (*dev_name == '[') {
> - end = strchr(++dev_name, ']');
> - if (end == NULL || end[1] != ':')
> - goto out_bad_devname;
> -
> - len = end - dev_name;
> - end++;
> - } else {
> - char *comma;
> -
> - end = strchr(dev_name, ':');
> - if (end == NULL)
> - goto out_bad_devname;
> - len = end - dev_name;
> -
> - /* kill possible hostname list: not supported */
> - comma = strchr(dev_name, ',');
> - if (comma != NULL && comma < end)
> - len = comma - dev_name;
> - }
> -
> - if (len > maxnamlen)
> - goto out_hostname;
> -
> - /* N.B. caller will free nfs_server.hostname in all cases */
> - *hostname = kstrndup(dev_name, len, GFP_KERNEL);
> - if (*hostname == NULL)
> - goto out_nomem;
> - len = strlen(++end);
> - if (len > maxpathlen)
> - goto out_path;
> - *export_path = kstrndup(end, len, GFP_KERNEL);
> - if (!*export_path)
> - goto out_nomem;
> -
> - dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
> - return 0;
> -
> -out_bad_devname:
> - dfprintk(MOUNT, "NFS: device name not in host:path format\n");
> - return -EINVAL;
> -
> -out_nomem:
> - dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
> - return -ENOMEM;
> -
> -out_hostname:
> - dfprintk(MOUNT, "NFS: server hostname too long\n");
> - return -ENAMETOOLONG;
> -
> -out_path:
> - dfprintk(MOUNT, "NFS: export pathname too long\n");
> - return -ENAMETOOLONG;
> -}
> -
> -/*
> - * Validate the NFS2/NFS3 mount data
> - * - fills in the mount root filehandle
> - *
> - * For option strings, user space handles the following behaviors:
> - *
> - * + DNS: mapping server host name to IP address ("addr=" option)
> - *
> - * + failure mode: how to behave if a mount request can't be handled
> - * immediately ("fg/bg" option)
> - *
> - * + retry: how often to retry a mount request ("retry=" option)
> - *
> - * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
> - * mountproto=tcp after mountproto=udp, and so on
> - */
> -static int nfs23_validate_mount_data(void *options,
> - struct nfs_parsed_mount_data *args,
> - struct nfs_fh *mntfh,
> - const char *dev_name)
> -{
> - struct nfs_mount_data *data = (struct nfs_mount_data *)options;
> - struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
> - int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
> -
> - if (data == NULL)
> - goto out_no_data;
> -
> - args->version = NFS_DEFAULT_VERSION;
> - switch (data->version) {
> - case 1:
> - data->namlen = 0; /* fall through */
> - case 2:
> - data->bsize = 0; /* fall through */
> - case 3:
> - if (data->flags & NFS_MOUNT_VER3)
> - goto out_no_v3;
> - data->root.size = NFS2_FHSIZE;
> - memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
> - /* Turn off security negotiation */
> - extra_flags |= NFS_MOUNT_SECFLAVOUR;
> - /* fall through */
> - case 4:
> - if (data->flags & NFS_MOUNT_SECFLAVOUR)
> - goto out_no_sec;
> - /* fall through */
> - case 5:
> - memset(data->context, 0, sizeof(data->context));
> - /* fall through */
> - case 6:
> - if (data->flags & NFS_MOUNT_VER3) {
> - if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
> - goto out_invalid_fh;
> - mntfh->size = data->root.size;
> - args->version = 3;
> - } else {
> - mntfh->size = NFS2_FHSIZE;
> - args->version = 2;
> - }
> -
> -
> - memcpy(mntfh->data, data->root.data, mntfh->size);
> - if (mntfh->size < sizeof(mntfh->data))
> - memset(mntfh->data + mntfh->size, 0,
> - sizeof(mntfh->data) - mntfh->size);
> -
> - /*
> - * Translate to nfs_parsed_mount_data, which nfs_fill_super
> - * can deal with.
> - */
> - args->flags = data->flags & NFS_MOUNT_FLAGMASK;
> - args->flags |= extra_flags;
> - args->rsize = data->rsize;
> - args->wsize = data->wsize;
> - args->timeo = data->timeo;
> - args->retrans = data->retrans;
> - args->acregmin = data->acregmin;
> - args->acregmax = data->acregmax;
> - args->acdirmin = data->acdirmin;
> - args->acdirmax = data->acdirmax;
> - args->need_mount = false;
> -
> - memcpy(sap, &data->addr, sizeof(data->addr));
> - args->nfs_server.addrlen = sizeof(data->addr);
> - args->nfs_server.port = ntohs(data->addr.sin_port);
> - if (sap->sa_family != AF_INET ||
> - !nfs_verify_server_address(sap))
> - goto out_no_address;
> -
> - if (!(data->flags & NFS_MOUNT_TCP))
> - args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
> - /* N.B. caller will free nfs_server.hostname in all cases */
> - args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
> - args->namlen = data->namlen;
> - args->bsize = data->bsize;
> -
> - if (data->flags & NFS_MOUNT_SECFLAVOUR)
> - args->selected_flavor = data->pseudoflavor;
> - else
> - args->selected_flavor = RPC_AUTH_UNIX;
> - if (!args->nfs_server.hostname)
> - goto out_nomem;
> -
> - if (!(data->flags & NFS_MOUNT_NONLM))
> - args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
> - NFS_MOUNT_LOCAL_FCNTL);
> - else
> - args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
> - NFS_MOUNT_LOCAL_FCNTL);
> - /*
> - * The legacy version 6 binary mount data from userspace has a
> - * field used only to transport selinux information into the
> - * the kernel. To continue to support that functionality we
> - * have a touch of selinux knowledge here in the NFS code. The
> - * userspace code converted context=blah to just blah so we are
> - * converting back to the full string selinux understands.
> - */
> - if (data->context[0]){
> -#ifdef CONFIG_SECURITY_SELINUX
> - int rc;
> - data->context[NFS_MAX_CONTEXT_LEN] = '\0';
> - rc = security_add_mnt_opt("context", data->context,
> - strlen(data->context), &args->lsm_opts);
> - if (rc)
> - return rc;
> -#else
> - return -EINVAL;
> -#endif
> - }
> -
> - break;
> - default:
> - return NFS_TEXT_DATA;
> - }
> -
> - return 0;
> -
> -out_no_data:
> - dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
> - return -EINVAL;
> -
> -out_no_v3:
> - dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
> - data->version);
> - return -EINVAL;
> -
> -out_no_sec:
> - dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
> - return -EINVAL;
> -
> -out_nomem:
> - dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
> - return -ENOMEM;
> -
> -out_no_address:
> - dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
> - return -EINVAL;
> -
> -out_invalid_fh:
> - dfprintk(MOUNT, "NFS: invalid root filehandle\n");
> - return -EINVAL;
> -}
> -
> -#if IS_ENABLED(CONFIG_NFS_V4)
> -static int nfs_validate_mount_data(struct file_system_type *fs_type,
> - void *options,
> - struct nfs_parsed_mount_data *args,
> - struct nfs_fh *mntfh,
> - const char *dev_name)
> -{
> - if (fs_type == &nfs_fs_type)
> - return nfs23_validate_mount_data(options, args, mntfh, dev_name);
> - return nfs4_validate_mount_data(options, args, dev_name);
> -}
> -#else
> -static int nfs_validate_mount_data(struct file_system_type *fs_type,
> - void *options,
> - struct nfs_parsed_mount_data *args,
> - struct nfs_fh *mntfh,
> - const char *dev_name)
> -{
> - return nfs23_validate_mount_data(options, args, mntfh, dev_name);
> -}
> -#endif
> -
> -static int nfs_validate_text_mount_data(void *options,
> - struct nfs_parsed_mount_data *args,
> - const char *dev_name)
> -{
> - int port = 0;
> - int max_namelen = PAGE_SIZE;
> - int max_pathlen = NFS_MAXPATHLEN;
> - struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
> -
> - if (nfs_parse_mount_options((char *)options, args) == 0)
> - return -EINVAL;
> -
> - if (!nfs_verify_server_address(sap))
> - goto out_no_address;
> -
> - if (args->version == 4) {
> -#if IS_ENABLED(CONFIG_NFS_V4)
> - if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
> - port = NFS_RDMA_PORT;
> - else
> - port = NFS_PORT;
> - max_namelen = NFS4_MAXNAMLEN;
> - max_pathlen = NFS4_MAXPATHLEN;
> - nfs_validate_transport_protocol(args);
> - if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
> - goto out_invalid_transport_udp;
> - nfs4_validate_mount_flags(args);
> -#else
> - goto out_v4_not_compiled;
> -#endif /* CONFIG_NFS_V4 */
> - } else {
> - nfs_set_mount_transport_protocol(args);
> - if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
> - port = NFS_RDMA_PORT;
> - }
> -
> - nfs_set_port(sap, &args->nfs_server.port, port);
> -
> - return nfs_parse_devname(dev_name,
> - &args->nfs_server.hostname,
> - max_namelen,
> - &args->nfs_server.export_path,
> - max_pathlen);
> -
> -#if !IS_ENABLED(CONFIG_NFS_V4)
> -out_v4_not_compiled:
> - dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
> - return -EPROTONOSUPPORT;
> -#else
> -out_invalid_transport_udp:
> - dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
> - return -EINVAL;
> -#endif /* !CONFIG_NFS_V4 */
> -
> -out_no_address:
> - dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
> - return -EINVAL;
> -}
> -
> #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
> | NFS_MOUNT_SECURE \
> | NFS_MOUNT_TCP \
> @@ -2719,113 +1415,6 @@ nfs_prepared_mount(struct file_system_type *fs_type, int flags,
>
> #if IS_ENABLED(CONFIG_NFS_V4)
>
> -static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
> -{
> - args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
> - NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
> -}
> -
> -/*
> - * Validate NFSv4 mount options
> - */
> -static int nfs4_validate_mount_data(void *options,
> - struct nfs_parsed_mount_data *args,
> - const char *dev_name)
> -{
> - struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
> - struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
> - char *c;
> -
> - if (data == NULL)
> - goto out_no_data;
> -
> - args->version = 4;
> -
> - switch (data->version) {
> - case 1:
> - if (data->host_addrlen > sizeof(args->nfs_server.address))
> - goto out_no_address;
> - if (data->host_addrlen == 0)
> - goto out_no_address;
> - args->nfs_server.addrlen = data->host_addrlen;
> - if (copy_from_user(sap, data->host_addr, data->host_addrlen))
> - return -EFAULT;
> - if (!nfs_verify_server_address(sap))
> - goto out_no_address;
> - args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
> -
> - if (data->auth_flavourlen) {
> - rpc_authflavor_t pseudoflavor;
> - if (data->auth_flavourlen > 1)
> - goto out_inval_auth;
> - if (copy_from_user(&pseudoflavor,
> - data->auth_flavours,
> - sizeof(pseudoflavor)))
> - return -EFAULT;
> - args->selected_flavor = pseudoflavor;
> - } else
> - args->selected_flavor = RPC_AUTH_UNIX;
> -
> - c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
> - if (IS_ERR(c))
> - return PTR_ERR(c);
> - args->nfs_server.hostname = c;
> -
> - c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
> - if (IS_ERR(c))
> - return PTR_ERR(c);
> - args->nfs_server.export_path = c;
> - dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
> -
> - c = strndup_user(data->client_addr.data, 16);
> - if (IS_ERR(c))
> - return PTR_ERR(c);
> - args->client_address = c;
> -
> - /*
> - * Translate to nfs_parsed_mount_data, which nfs4_fill_super
> - * can deal with.
> - */
> -
> - args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
> - args->rsize = data->rsize;
> - args->wsize = data->wsize;
> - args->timeo = data->timeo;
> - args->retrans = data->retrans;
> - args->acregmin = data->acregmin;
> - args->acregmax = data->acregmax;
> - args->acdirmin = data->acdirmin;
> - args->acdirmax = data->acdirmax;
> - args->nfs_server.protocol = data->proto;
> - nfs_validate_transport_protocol(args);
> - if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
> - goto out_invalid_transport_udp;
> -
> - break;
> - default:
> - return NFS_TEXT_DATA;
> - }
> -
> - return 0;
> -
> -out_no_data:
> - dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
> - return -EINVAL;
> -
> -out_inval_auth:
> - dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
> - data->auth_flavourlen);
> - return -EINVAL;
> -
> -out_no_address:
> - dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
> - return -EINVAL;
> -
> -out_invalid_transport_udp:
> - dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
> - return -EINVAL;
> -}
> -
> /*
> * NFS v4 module parameters need to stay in the
> * NFS client for backwards compatibility
> --
> 2.17.2
>

--
Chuck Lever
chucklever@gmail.com