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fs_context.c
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fs_context.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/fs/nfs/fs_context.c
*
* Copyright (C) 1992 Rick Sladkey
* Conversion to new mount api Copyright (C) David Howells
*
* NFS mount handling.
*
* Split from fs/nfs/super.c by David Howells <dhowells@redhat.com>
*/
#include <linux/compat.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/nfs4_mount.h>
#include "nfs.h"
#include "internal.h"
#include "nfstrace.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 nfs_param {
Opt_ac,
Opt_acdirmax,
Opt_acdirmin,
Opt_acl,
Opt_acregmax,
Opt_acregmin,
Opt_actimeo,
Opt_addr,
Opt_bg,
Opt_bsize,
Opt_clientaddr,
Opt_cto,
Opt_fg,
Opt_fscache,
Opt_fscache_flag,
Opt_hard,
Opt_intr,
Opt_local_lock,
Opt_lock,
Opt_lookupcache,
Opt_migration,
Opt_minorversion,
Opt_mountaddr,
Opt_mounthost,
Opt_mountport,
Opt_mountproto,
Opt_mountvers,
Opt_namelen,
Opt_nconnect,
Opt_max_connect,
Opt_port,
Opt_posix,
Opt_proto,
Opt_rdirplus,
Opt_rdma,
Opt_resvport,
Opt_retrans,
Opt_retry,
Opt_rsize,
Opt_sec,
Opt_sharecache,
Opt_sloppy,
Opt_soft,
Opt_softerr,
Opt_softreval,
Opt_source,
Opt_tcp,
Opt_timeo,
Opt_trunkdiscovery,
Opt_udp,
Opt_v,
Opt_vers,
Opt_wsize,
Opt_write,
};
enum {
Opt_local_lock_all,
Opt_local_lock_flock,
Opt_local_lock_none,
Opt_local_lock_posix,
};
static const struct constant_table nfs_param_enums_local_lock[] = {
{ "all", Opt_local_lock_all },
{ "flock", Opt_local_lock_flock },
{ "posix", Opt_local_lock_posix },
{ "none", Opt_local_lock_none },
{}
};
enum {
Opt_lookupcache_all,
Opt_lookupcache_none,
Opt_lookupcache_positive,
};
static const struct constant_table nfs_param_enums_lookupcache[] = {
{ "all", Opt_lookupcache_all },
{ "none", Opt_lookupcache_none },
{ "pos", Opt_lookupcache_positive },
{ "positive", Opt_lookupcache_positive },
{}
};
enum {
Opt_write_lazy,
Opt_write_eager,
Opt_write_wait,
};
static const struct constant_table nfs_param_enums_write[] = {
{ "lazy", Opt_write_lazy },
{ "eager", Opt_write_eager },
{ "wait", Opt_write_wait },
{}
};
static const struct fs_parameter_spec nfs_fs_parameters[] = {
fsparam_flag_no("ac", Opt_ac),
fsparam_u32 ("acdirmax", Opt_acdirmax),
fsparam_u32 ("acdirmin", Opt_acdirmin),
fsparam_flag_no("acl", Opt_acl),
fsparam_u32 ("acregmax", Opt_acregmax),
fsparam_u32 ("acregmin", Opt_acregmin),
fsparam_u32 ("actimeo", Opt_actimeo),
fsparam_string("addr", Opt_addr),
fsparam_flag ("bg", Opt_bg),
fsparam_u32 ("bsize", Opt_bsize),
fsparam_string("clientaddr", Opt_clientaddr),
fsparam_flag_no("cto", Opt_cto),
fsparam_flag ("fg", Opt_fg),
fsparam_flag_no("fsc", Opt_fscache_flag),
fsparam_string("fsc", Opt_fscache),
fsparam_flag ("hard", Opt_hard),
__fsparam(NULL, "intr", Opt_intr,
fs_param_neg_with_no|fs_param_deprecated, NULL),
fsparam_enum ("local_lock", Opt_local_lock, nfs_param_enums_local_lock),
fsparam_flag_no("lock", Opt_lock),
fsparam_enum ("lookupcache", Opt_lookupcache, nfs_param_enums_lookupcache),
fsparam_flag_no("migration", Opt_migration),
fsparam_u32 ("minorversion", Opt_minorversion),
fsparam_string("mountaddr", Opt_mountaddr),
fsparam_string("mounthost", Opt_mounthost),
fsparam_u32 ("mountport", Opt_mountport),
fsparam_string("mountproto", Opt_mountproto),
fsparam_u32 ("mountvers", Opt_mountvers),
fsparam_u32 ("namlen", Opt_namelen),
fsparam_u32 ("nconnect", Opt_nconnect),
fsparam_u32 ("max_connect", Opt_max_connect),
fsparam_string("nfsvers", Opt_vers),
fsparam_u32 ("port", Opt_port),
fsparam_flag_no("posix", Opt_posix),
fsparam_string("proto", Opt_proto),
fsparam_flag_no("rdirplus", Opt_rdirplus),
fsparam_flag ("rdma", Opt_rdma),
fsparam_flag_no("resvport", Opt_resvport),
fsparam_u32 ("retrans", Opt_retrans),
fsparam_string("retry", Opt_retry),
fsparam_u32 ("rsize", Opt_rsize),
fsparam_string("sec", Opt_sec),
fsparam_flag_no("sharecache", Opt_sharecache),
fsparam_flag ("sloppy", Opt_sloppy),
fsparam_flag ("soft", Opt_soft),
fsparam_flag ("softerr", Opt_softerr),
fsparam_flag ("softreval", Opt_softreval),
fsparam_string("source", Opt_source),
fsparam_flag ("tcp", Opt_tcp),
fsparam_u32 ("timeo", Opt_timeo),
fsparam_flag_no("trunkdiscovery", Opt_trunkdiscovery),
fsparam_flag ("udp", Opt_udp),
fsparam_flag ("v2", Opt_v),
fsparam_flag ("v3", Opt_v),
fsparam_flag ("v4", Opt_v),
fsparam_flag ("v4.0", Opt_v),
fsparam_flag ("v4.1", Opt_v),
fsparam_flag ("v4.2", Opt_v),
fsparam_string("vers", Opt_vers),
fsparam_enum ("write", Opt_write, nfs_param_enums_write),
fsparam_u32 ("wsize", Opt_wsize),
{}
};
enum {
Opt_vers_2,
Opt_vers_3,
Opt_vers_4,
Opt_vers_4_0,
Opt_vers_4_1,
Opt_vers_4_2,
};
static const struct constant_table nfs_vers_tokens[] = {
{ "2", Opt_vers_2 },
{ "3", Opt_vers_3 },
{ "4", Opt_vers_4 },
{ "4.0", Opt_vers_4_0 },
{ "4.1", Opt_vers_4_1 },
{ "4.2", Opt_vers_4_2 },
{}
};
enum {
Opt_xprt_rdma,
Opt_xprt_rdma6,
Opt_xprt_tcp,
Opt_xprt_tcp6,
Opt_xprt_udp,
Opt_xprt_udp6,
nr__Opt_xprt
};
static const struct constant_table nfs_xprt_protocol_tokens[] = {
{ "rdma", Opt_xprt_rdma },
{ "rdma6", Opt_xprt_rdma6 },
{ "tcp", Opt_xprt_tcp },
{ "tcp6", Opt_xprt_tcp6 },
{ "udp", Opt_xprt_udp },
{ "udp6", Opt_xprt_udp6 },
{}
};
enum {
Opt_sec_krb5,
Opt_sec_krb5i,
Opt_sec_krb5p,
Opt_sec_lkey,
Opt_sec_lkeyi,
Opt_sec_lkeyp,
Opt_sec_none,
Opt_sec_spkm,
Opt_sec_spkmi,
Opt_sec_spkmp,
Opt_sec_sys,
nr__Opt_sec
};
static const struct constant_table nfs_secflavor_tokens[] = {
{ "krb5", Opt_sec_krb5 },
{ "krb5i", Opt_sec_krb5i },
{ "krb5p", Opt_sec_krb5p },
{ "lkey", Opt_sec_lkey },
{ "lkeyi", Opt_sec_lkeyi },
{ "lkeyp", Opt_sec_lkeyp },
{ "none", Opt_sec_none },
{ "null", Opt_sec_none },
{ "spkm3", Opt_sec_spkm },
{ "spkm3i", Opt_sec_spkmi },
{ "spkm3p", Opt_sec_spkmp },
{ "sys", Opt_sec_sys },
{}
};
/*
* 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);
}
}
return 0;
}
#ifdef CONFIG_NFS_DISABLE_UDP_SUPPORT
static bool nfs_server_transport_udp_invalid(const struct nfs_fs_context *ctx)
{
return true;
}
#else
static bool nfs_server_transport_udp_invalid(const struct nfs_fs_context *ctx)
{
if (ctx->version == 4)
return true;
return false;
}
#endif
/*
* Sanity check the NFS transport protocol.
*/
static int nfs_validate_transport_protocol(struct fs_context *fc,
struct nfs_fs_context *ctx)
{
switch (ctx->nfs_server.protocol) {
case XPRT_TRANSPORT_UDP:
if (nfs_server_transport_udp_invalid(ctx))
goto out_invalid_transport_udp;
break;
case XPRT_TRANSPORT_TCP:
case XPRT_TRANSPORT_RDMA:
break;
default:
ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
}
return 0;
out_invalid_transport_udp:
return nfs_invalf(fc, "NFS: Unsupported transport protocol udp");
}
/*
* 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_fs_context *ctx)
{
if (ctx->mount_server.protocol == XPRT_TRANSPORT_UDP ||
ctx->mount_server.protocol == XPRT_TRANSPORT_TCP)
return;
switch (ctx->nfs_server.protocol) {
case XPRT_TRANSPORT_UDP:
ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
break;
case XPRT_TRANSPORT_TCP:
case XPRT_TRANSPORT_RDMA:
ctx->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 int nfs_auth_info_add(struct fs_context *fc,
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 0;
}
if (auth_info->flavor_len + 1 >= max_flavor_len)
return nfs_invalf(fc, "NFS: too many sec= flavors");
auth_info->flavors[auth_info->flavor_len++] = flavor;
return 0;
}
/*
* Parse the value of the 'sec=' option.
*/
static int nfs_parse_security_flavors(struct fs_context *fc,
struct fs_parameter *param)
{
struct nfs_fs_context *ctx = nfs_fc2context(fc);
rpc_authflavor_t pseudoflavor;
char *string = param->string, *p;
int ret;
trace_nfs_mount_assign(param->key, string);
while ((p = strsep(&string, ":")) != NULL) {
if (!*p)
continue;
switch (lookup_constant(nfs_secflavor_tokens, p, -1)) {
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:
return nfs_invalf(fc, "NFS: sec=%s option not recognized", p);
}
ret = nfs_auth_info_add(fc, &ctx->auth_info, pseudoflavor);
if (ret < 0)
return ret;
}
return 0;
}
static int nfs_parse_version_string(struct fs_context *fc,
const char *string)
{
struct nfs_fs_context *ctx = nfs_fc2context(fc);
ctx->flags &= ~NFS_MOUNT_VER3;
switch (lookup_constant(nfs_vers_tokens, string, -1)) {
case Opt_vers_2:
ctx->version = 2;
break;
case Opt_vers_3:
ctx->flags |= NFS_MOUNT_VER3;
ctx->version = 3;
break;
case Opt_vers_4:
/* Backward compatibility option. In future,
* the mount program should always supply
* a NFSv4 minor version number.
*/
ctx->version = 4;
break;
case Opt_vers_4_0:
ctx->version = 4;
ctx->minorversion = 0;
break;
case Opt_vers_4_1:
ctx->version = 4;
ctx->minorversion = 1;
break;
case Opt_vers_4_2:
ctx->version = 4;
ctx->minorversion = 2;
break;
default:
return nfs_invalf(fc, "NFS: Unsupported NFS version");
}
return 0;
}
/*
* Parse a single mount parameter.
*/
static int nfs_fs_context_parse_param(struct fs_context *fc,
struct fs_parameter *param)
{
struct fs_parse_result result;
struct nfs_fs_context *ctx = nfs_fc2context(fc);
unsigned short protofamily, mountfamily;
unsigned int len;
int ret, opt;
trace_nfs_mount_option(param);
opt = fs_parse(fc, nfs_fs_parameters, param, &result);
if (opt < 0)
return (opt == -ENOPARAM && ctx->sloppy) ? 1 : opt;
if (fc->security)
ctx->has_sec_mnt_opts = 1;
switch (opt) {
case Opt_source:
if (fc->source)
return nfs_invalf(fc, "NFS: Multiple sources not supported");
fc->source = param->string;
param->string = NULL;
break;
/*
* boolean options: foo/nofoo
*/
case Opt_soft:
ctx->flags |= NFS_MOUNT_SOFT;
ctx->flags &= ~NFS_MOUNT_SOFTERR;
break;
case Opt_softerr:
ctx->flags |= NFS_MOUNT_SOFTERR | NFS_MOUNT_SOFTREVAL;
ctx->flags &= ~NFS_MOUNT_SOFT;
break;
case Opt_hard:
ctx->flags &= ~(NFS_MOUNT_SOFT |
NFS_MOUNT_SOFTERR |
NFS_MOUNT_SOFTREVAL);
break;
case Opt_softreval:
if (result.negated)
ctx->flags &= ~NFS_MOUNT_SOFTREVAL;
else
ctx->flags |= NFS_MOUNT_SOFTREVAL;
break;
case Opt_posix:
if (result.negated)
ctx->flags &= ~NFS_MOUNT_POSIX;
else
ctx->flags |= NFS_MOUNT_POSIX;
break;
case Opt_cto:
if (result.negated)
ctx->flags |= NFS_MOUNT_NOCTO;
else
ctx->flags &= ~NFS_MOUNT_NOCTO;
break;
case Opt_trunkdiscovery:
if (result.negated)
ctx->flags &= ~NFS_MOUNT_TRUNK_DISCOVERY;
else
ctx->flags |= NFS_MOUNT_TRUNK_DISCOVERY;
break;
case Opt_ac:
if (result.negated)
ctx->flags |= NFS_MOUNT_NOAC;
else
ctx->flags &= ~NFS_MOUNT_NOAC;
break;
case Opt_lock:
if (result.negated) {
ctx->flags |= NFS_MOUNT_NONLM;
ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
} else {
ctx->flags &= ~NFS_MOUNT_NONLM;
ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
}
break;
case Opt_udp:
ctx->flags &= ~NFS_MOUNT_TCP;
ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
break;
case Opt_tcp:
case Opt_rdma:
ctx->flags |= NFS_MOUNT_TCP; /* for side protocols */
ret = xprt_find_transport_ident(param->key);
if (ret < 0)
goto out_bad_transport;
ctx->nfs_server.protocol = ret;
break;
case Opt_acl:
if (result.negated)
ctx->flags |= NFS_MOUNT_NOACL;
else
ctx->flags &= ~NFS_MOUNT_NOACL;
break;
case Opt_rdirplus:
if (result.negated)
ctx->flags |= NFS_MOUNT_NORDIRPLUS;
else
ctx->flags &= ~NFS_MOUNT_NORDIRPLUS;
break;
case Opt_sharecache:
if (result.negated)
ctx->flags |= NFS_MOUNT_UNSHARED;
else
ctx->flags &= ~NFS_MOUNT_UNSHARED;
break;
case Opt_resvport:
if (result.negated)
ctx->flags |= NFS_MOUNT_NORESVPORT;
else
ctx->flags &= ~NFS_MOUNT_NORESVPORT;
break;
case Opt_fscache_flag:
if (result.negated)
ctx->options &= ~NFS_OPTION_FSCACHE;
else
ctx->options |= NFS_OPTION_FSCACHE;
kfree(ctx->fscache_uniq);
ctx->fscache_uniq = NULL;
break;
case Opt_fscache:
ctx->options |= NFS_OPTION_FSCACHE;
kfree(ctx->fscache_uniq);
ctx->fscache_uniq = param->string;
param->string = NULL;
break;
case Opt_migration:
if (result.negated)
ctx->options &= ~NFS_OPTION_MIGRATION;
else
ctx->options |= NFS_OPTION_MIGRATION;
break;
/*
* options that take numeric values
*/
case Opt_port:
if (result.uint_32 > USHRT_MAX)
goto out_of_bounds;
ctx->nfs_server.port = result.uint_32;
break;
case Opt_rsize:
ctx->rsize = result.uint_32;
break;
case Opt_wsize:
ctx->wsize = result.uint_32;
break;
case Opt_bsize:
ctx->bsize = result.uint_32;
break;
case Opt_timeo:
if (result.uint_32 < 1 || result.uint_32 > INT_MAX)
goto out_of_bounds;
ctx->timeo = result.uint_32;
break;
case Opt_retrans:
if (result.uint_32 > INT_MAX)
goto out_of_bounds;
ctx->retrans = result.uint_32;
break;
case Opt_acregmin:
ctx->acregmin = result.uint_32;
break;
case Opt_acregmax:
ctx->acregmax = result.uint_32;
break;
case Opt_acdirmin:
ctx->acdirmin = result.uint_32;
break;
case Opt_acdirmax:
ctx->acdirmax = result.uint_32;
break;
case Opt_actimeo:
ctx->acregmin = result.uint_32;
ctx->acregmax = result.uint_32;
ctx->acdirmin = result.uint_32;
ctx->acdirmax = result.uint_32;
break;
case Opt_namelen:
ctx->namlen = result.uint_32;
break;
case Opt_mountport:
if (result.uint_32 > USHRT_MAX)
goto out_of_bounds;
ctx->mount_server.port = result.uint_32;
break;
case Opt_mountvers:
if (result.uint_32 < NFS_MNT_VERSION ||
result.uint_32 > NFS_MNT3_VERSION)
goto out_of_bounds;
ctx->mount_server.version = result.uint_32;
break;
case Opt_minorversion:
if (result.uint_32 > NFS4_MAX_MINOR_VERSION)
goto out_of_bounds;
ctx->minorversion = result.uint_32;
break;
/*
* options that take text values
*/
case Opt_v:
ret = nfs_parse_version_string(fc, param->key + 1);
if (ret < 0)
return ret;
break;
case Opt_vers:
trace_nfs_mount_assign(param->key, param->string);
ret = nfs_parse_version_string(fc, param->string);
if (ret < 0)
return ret;
break;
case Opt_sec:
ret = nfs_parse_security_flavors(fc, param);
if (ret < 0)
return ret;
break;
case Opt_proto:
trace_nfs_mount_assign(param->key, param->string);
protofamily = AF_INET;
switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
case Opt_xprt_udp6:
protofamily = AF_INET6;
fallthrough;
case Opt_xprt_udp:
ctx->flags &= ~NFS_MOUNT_TCP;
ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
break;
case Opt_xprt_tcp6:
protofamily = AF_INET6;
fallthrough;
case Opt_xprt_tcp:
ctx->flags |= NFS_MOUNT_TCP;
ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
break;
case Opt_xprt_rdma6:
protofamily = AF_INET6;
fallthrough;
case Opt_xprt_rdma:
/* vector side protocols to TCP */
ctx->flags |= NFS_MOUNT_TCP;
ret = xprt_find_transport_ident(param->string);
if (ret < 0)
goto out_bad_transport;
ctx->nfs_server.protocol = ret;
break;
default:
goto out_bad_transport;
}
ctx->protofamily = protofamily;
break;
case Opt_mountproto:
trace_nfs_mount_assign(param->key, param->string);
mountfamily = AF_INET;
switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
case Opt_xprt_udp6:
mountfamily = AF_INET6;
fallthrough;
case Opt_xprt_udp:
ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
break;
case Opt_xprt_tcp6:
mountfamily = AF_INET6;
fallthrough;
case Opt_xprt_tcp:
ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
break;
case Opt_xprt_rdma: /* not used for side protocols */
default:
goto out_bad_transport;
}
ctx->mountfamily = mountfamily;
break;
case Opt_addr:
trace_nfs_mount_assign(param->key, param->string);
len = rpc_pton(fc->net_ns, param->string, param->size,
&ctx->nfs_server.address,
sizeof(ctx->nfs_server._address));
if (len == 0)
goto out_invalid_address;
ctx->nfs_server.addrlen = len;
break;
case Opt_clientaddr:
trace_nfs_mount_assign(param->key, param->string);
kfree(ctx->client_address);
ctx->client_address = param->string;
param->string = NULL;
break;
case Opt_mounthost:
trace_nfs_mount_assign(param->key, param->string);
kfree(ctx->mount_server.hostname);
ctx->mount_server.hostname = param->string;
param->string = NULL;
break;
case Opt_mountaddr:
trace_nfs_mount_assign(param->key, param->string);
len = rpc_pton(fc->net_ns, param->string, param->size,
&ctx->mount_server.address,
sizeof(ctx->mount_server._address));
if (len == 0)
goto out_invalid_address;
ctx->mount_server.addrlen = len;
break;
case Opt_nconnect:
if (result.uint_32 < 1 || result.uint_32 > NFS_MAX_CONNECTIONS)
goto out_of_bounds;
ctx->nfs_server.nconnect = result.uint_32;
break;
case Opt_max_connect:
if (result.uint_32 < 1 || result.uint_32 > NFS_MAX_TRANSPORTS)
goto out_of_bounds;
ctx->nfs_server.max_connect = result.uint_32;
break;
case Opt_lookupcache:
switch (result.uint_32) {
case Opt_lookupcache_all:
ctx->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
break;
case Opt_lookupcache_positive:
ctx->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
break;
case Opt_lookupcache_none:
ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
break;
default:
goto out_invalid_value;
}
break;
case Opt_local_lock:
switch (result.uint_32) {
case Opt_local_lock_all:
ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK |
NFS_MOUNT_LOCAL_FCNTL);
break;
case Opt_local_lock_flock:
ctx->flags |= NFS_MOUNT_LOCAL_FLOCK;
break;
case Opt_local_lock_posix:
ctx->flags |= NFS_MOUNT_LOCAL_FCNTL;
break;
case Opt_local_lock_none:
ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
NFS_MOUNT_LOCAL_FCNTL);
break;
default:
goto out_invalid_value;
}
break;
case Opt_write:
switch (result.uint_32) {
case Opt_write_lazy:
ctx->flags &=
~(NFS_MOUNT_WRITE_EAGER | NFS_MOUNT_WRITE_WAIT);
break;
case Opt_write_eager:
ctx->flags |= NFS_MOUNT_WRITE_EAGER;
ctx->flags &= ~NFS_MOUNT_WRITE_WAIT;
break;
case Opt_write_wait:
ctx->flags |=
NFS_MOUNT_WRITE_EAGER | NFS_MOUNT_WRITE_WAIT;
break;
default:
goto out_invalid_value;
}
break;
/*
* Special options
*/
case Opt_sloppy:
ctx->sloppy = true;
break;
}
return 0;
out_invalid_value:
return nfs_invalf(fc, "NFS: Bad mount option value specified");
out_invalid_address:
return nfs_invalf(fc, "NFS: Bad IP address specified");
out_of_bounds:
return nfs_invalf(fc, "NFS: Value for '%s' out of range", param->key);
out_bad_transport:
return nfs_invalf(fc, "NFS: Unrecognized transport protocol");
}
/*
* Split fc->source 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_source(struct fs_context *fc,
size_t maxnamlen, size_t maxpathlen)
{
struct nfs_fs_context *ctx = nfs_fc2context(fc);
const char *dev_name = fc->source;
size_t len;
const char *end;
if (unlikely(!dev_name || !*dev_name))
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 {
const char *comma;
end = strchr(dev_name, ':');
if (end == NULL)
goto out_bad_devname;
len = end - dev_name;
/* kill possible hostname list: not supported */
comma = memchr(dev_name, ',', len);
if (comma)
len = comma - dev_name;
}
if (len > maxnamlen)
goto out_hostname;
kfree(ctx->nfs_server.hostname);
/* N.B. caller will free nfs_server.hostname in all cases */
ctx->nfs_server.hostname = kmemdup_nul(dev_name, len, GFP_KERNEL);
if (!ctx->nfs_server.hostname)
goto out_nomem;
len = strlen(++end);
if (len > maxpathlen)
goto out_path;
ctx->nfs_server.export_path = kmemdup_nul(end, len, GFP_KERNEL);
if (!ctx->nfs_server.export_path)
goto out_nomem;
trace_nfs_mount_path(ctx->nfs_server.export_path);
return 0;
out_bad_devname:
return nfs_invalf(fc, "NFS: device name not in host:path format");
out_nomem:
nfs_errorf(fc, "NFS: not enough memory to parse device name");
return -ENOMEM;
out_hostname:
nfs_errorf(fc, "NFS: server hostname too long");
return -ENAMETOOLONG;
out_path:
nfs_errorf(fc, "NFS: export pathname too long");
return -ENAMETOOLONG;
}
static inline bool is_remount_fc(struct fs_context *fc)
{
return fc->root != NULL;
}
/*
* Parse monolithic 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_parse_monolithic(struct fs_context *fc,
struct nfs_mount_data *data)
{
struct nfs_fs_context *ctx = nfs_fc2context(fc);
struct nfs_fh *mntfh = ctx->mntfh;
struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
int ret;
if (data == NULL)
goto out_no_data;
ctx->version = NFS_DEFAULT_VERSION;
switch (data->version) {
case 1:
data->namlen = 0;
fallthrough;
case 2:
data->bsize = 0;
fallthrough;
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;
fallthrough;
case 4:
if (data->flags & NFS_MOUNT_SECFLAVOUR)
goto out_no_sec;
fallthrough;
case 5:
memset(data->context, 0, sizeof(data->context));