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OpenCloudOS-Kernel/fs/nfs/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/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"
#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_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_udp,
Opt_v,
Opt_vers,
Opt_wsize,
};
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 },
{ "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 },
{}
};
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_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 ("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_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);
}
}
dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
return 0;
}
/*
* Sanity check the NFS transport protocol.
*
*/
static void nfs_validate_transport_protocol(struct nfs_fs_context *ctx)
{
switch (ctx->nfs_server.protocol) {
case XPRT_TRANSPORT_UDP:
case XPRT_TRANSPORT_TCP:
case XPRT_TRANSPORT_RDMA:
break;
default:
ctx->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_fs_context *ctx)
{
nfs_validate_transport_protocol(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;
dfprintk(MOUNT, "NFS: parsing %s=%s option\n", param->key, param->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;
dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", param->key);
opt = fs_parse(fc, nfs_fs_parameters, param, &result);
if (opt < 0)
return ctx->sloppy ? 1 : opt;
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_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:
ctx->flags |= NFS_MOUNT_TCP;
ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
break;
case Opt_rdma:
ctx->flags |= NFS_MOUNT_TCP; /* for side protocols */
ctx->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
xprt_load_transport(param->key);
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:
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:
protofamily = AF_INET;
switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
case Opt_xprt_udp6:
protofamily = AF_INET6;
/* fall through */
case Opt_xprt_udp:
ctx->flags &= ~NFS_MOUNT_TCP;
ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
break;
case Opt_xprt_tcp6:
protofamily = AF_INET6;
/* fall through */
case Opt_xprt_tcp:
ctx->flags |= NFS_MOUNT_TCP;
ctx->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 */
ctx->flags |= NFS_MOUNT_TCP;
ctx->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
xprt_load_transport(param->string);
break;
default:
return nfs_invalf(fc, "NFS: Unrecognized transport protocol");
}
ctx->protofamily = protofamily;
break;
case Opt_mountproto:
mountfamily = AF_INET;
switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
case Opt_xprt_udp6:
mountfamily = AF_INET6;
/* fall through */
case Opt_xprt_udp:
ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
break;
case Opt_xprt_tcp6:
mountfamily = AF_INET6;
/* fall through */
case Opt_xprt_tcp:
ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
break;
case Opt_xprt_rdma: /* not used for side protocols */
default:
return nfs_invalf(fc, "NFS: Unrecognized transport protocol");
}
ctx->mountfamily = mountfamily;
break;
case Opt_addr:
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:
kfree(ctx->client_address);
ctx->client_address = param->string;
param->string = NULL;
break;
case Opt_mounthost:
kfree(ctx->mount_server.hostname);
ctx->mount_server.hostname = param->string;
param->string = NULL;
break;
case Opt_mountaddr:
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_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;
/*
* Special options
*/
case Opt_sloppy:
ctx->sloppy = true;
dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
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);
}
/*
* 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)) {
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 {
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;
dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", 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;
if (data == NULL)
goto out_no_data;
ctx->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;
ctx->version = 3;
} else {
mntfh->size = NFS2_FHSIZE;
ctx->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_fs_context, which nfs_fill_super
* can deal with.
*/
ctx->flags = data->flags & NFS_MOUNT_FLAGMASK;
ctx->flags |= extra_flags;
ctx->rsize = data->rsize;
ctx->wsize = data->wsize;
ctx->timeo = data->timeo;
ctx->retrans = data->retrans;
ctx->acregmin = data->acregmin;
ctx->acregmax = data->acregmax;
ctx->acdirmin = data->acdirmin;
ctx->acdirmax = data->acdirmax;
ctx->need_mount = false;
memcpy(sap, &data->addr, sizeof(data->addr));
ctx->nfs_server.addrlen = sizeof(data->addr);
ctx->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))
ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
/* N.B. caller will free nfs_server.hostname in all cases */
ctx->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
if (!ctx->nfs_server.hostname)
goto out_nomem;
ctx->namlen = data->namlen;
ctx->bsize = data->bsize;
if (data->flags & NFS_MOUNT_SECFLAVOUR)
ctx->selected_flavor = data->pseudoflavor;
else
ctx->selected_flavor = RPC_AUTH_UNIX;
if (!(data->flags & NFS_MOUNT_NONLM))
ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
NFS_MOUNT_LOCAL_FCNTL);
else
ctx->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
* 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 ret;
data->context[NFS_MAX_CONTEXT_LEN] = '\0';
ret = vfs_parse_fs_string(fc, "context",
data->context, strlen(data->context));
if (ret < 0)
return ret;
#else
return -EINVAL;
#endif
}
break;
default:
goto generic;
}
ctx->skip_reconfig_option_check = true;
return 0;
generic:
return generic_parse_monolithic(fc, data);
out_no_data:
if (is_remount_fc(fc)) {
ctx->skip_reconfig_option_check = true;
return 0;
}
return nfs_invalf(fc, "NFS: mount program didn't pass any mount data");
out_no_v3:
return nfs_invalf(fc, "NFS: nfs_mount_data version does not support v3");
out_no_sec:
return nfs_invalf(fc, "NFS: nfs_mount_data version supports only AUTH_SYS");
out_nomem:
dfprintk(MOUNT, "NFS: not enough memory to handle mount options");
return -ENOMEM;
out_no_address:
return nfs_invalf(fc, "NFS: mount program didn't pass remote address");
out_invalid_fh:
return nfs_invalf(fc, "NFS: invalid root filehandle");
}
#if IS_ENABLED(CONFIG_NFS_V4)
/*
* Validate NFSv4 mount options
*/
static int nfs4_parse_monolithic(struct fs_context *fc,
struct nfs4_mount_data *data)
{
struct nfs_fs_context *ctx = nfs_fc2context(fc);
struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
char *c;
if (data == NULL)
goto out_no_data;
ctx->version = 4;
switch (data->version) {
case 1:
if (data->host_addrlen > sizeof(ctx->nfs_server.address))
goto out_no_address;
if (data->host_addrlen == 0)
goto out_no_address;
ctx->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;
ctx->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;
ctx->selected_flavor = pseudoflavor;
} else
ctx->selected_flavor = RPC_AUTH_UNIX;
c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
if (IS_ERR(c))
return PTR_ERR(c);
ctx->nfs_server.hostname = c;
c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
if (IS_ERR(c))
return PTR_ERR(c);
ctx->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);
ctx->client_address = c;
/*
* Translate to nfs_fs_context, which nfs_fill_super
* can deal with.
*/
ctx->flags = data->flags & NFS4_MOUNT_FLAGMASK;
ctx->rsize = data->rsize;
ctx->wsize = data->wsize;
ctx->timeo = data->timeo;
ctx->retrans = data->retrans;
ctx->acregmin = data->acregmin;
ctx->acregmax = data->acregmax;
ctx->acdirmin = data->acdirmin;
ctx->acdirmax = data->acdirmax;
ctx->nfs_server.protocol = data->proto;
nfs_validate_transport_protocol(ctx);
if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
goto out_invalid_transport_udp;
break;
default:
goto generic;
}
ctx->skip_reconfig_option_check = true;
return 0;
generic:
return generic_parse_monolithic(fc, data);
out_no_data:
if (is_remount_fc(fc)) {
ctx->skip_reconfig_option_check = true;
return 0;
}
return nfs_invalf(fc, "NFS4: mount program didn't pass any mount data");
out_inval_auth:
return nfs_invalf(fc, "NFS4: Invalid number of RPC auth flavours %d",
data->auth_flavourlen);
out_no_address:
return nfs_invalf(fc, "NFS4: mount program didn't pass remote address");
out_invalid_transport_udp:
return nfs_invalf(fc, "NFS: Unsupported transport protocol udp");
}
#endif
/*
* Parse a monolithic block of data from sys_mount().
*/
static int nfs_fs_context_parse_monolithic(struct fs_context *fc,
void *data)
{
if (fc->fs_type == &nfs_fs_type)
return nfs23_parse_monolithic(fc, data);
#if IS_ENABLED(CONFIG_NFS_V4)
if (fc->fs_type == &nfs4_fs_type)
return nfs4_parse_monolithic(fc, data);
#endif
return nfs_invalf(fc, "NFS: Unsupported monolithic data version");
}
/*
* Validate the preparsed information in the config.
*/
static int nfs_fs_context_validate(struct fs_context *fc)
{
struct nfs_fs_context *ctx = nfs_fc2context(fc);
struct nfs_subversion *nfs_mod;
struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
int max_namelen = PAGE_SIZE;
int max_pathlen = NFS_MAXPATHLEN;
int port = 0;
int ret;
if (!fc->source)
goto out_no_device_name;
/* Check for sanity first. */
if (ctx->minorversion && ctx->version != 4)
goto out_minorversion_mismatch;
if (ctx->options & NFS_OPTION_MIGRATION &&
(ctx->version != 4 || ctx->minorversion != 0))
goto out_migration_misuse;
/* Verify that any proto=/mountproto= options match the address
* families in the addr=/mountaddr= options.
*/
if (ctx->protofamily != AF_UNSPEC &&
ctx->protofamily != ctx->nfs_server.address.sa_family)
goto out_proto_mismatch;
if (ctx->mountfamily != AF_UNSPEC) {
if (ctx->mount_server.addrlen) {
if (ctx->mountfamily != ctx->mount_server.address.sa_family)
goto out_mountproto_mismatch;
} else {
if (ctx->mountfamily != ctx->nfs_server.address.sa_family)
goto out_mountproto_mismatch;
}
}
if (!nfs_verify_server_address(sap))
goto out_no_address;
if (ctx->version == 4) {
if (IS_ENABLED(CONFIG_NFS_V4)) {
if (ctx->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(ctx);
if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
goto out_invalid_transport_udp;
ctx->flags &= ~(NFS_MOUNT_NONLM | NFS_MOUNT_NOACL |
NFS_MOUNT_VER3 | NFS_MOUNT_LOCAL_FLOCK |
NFS_MOUNT_LOCAL_FCNTL);
} else {
goto out_v4_not_compiled;
}
} else {
nfs_set_mount_transport_protocol(ctx);
#ifdef CONFIG_NFS_DISABLE_UDP_SUPPORT
if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
goto out_invalid_transport_udp;
#endif
if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
port = NFS_RDMA_PORT;
}
nfs_set_port(sap, &ctx->nfs_server.port, port);
ret = nfs_parse_source(fc, max_namelen, max_pathlen);
if (ret < 0)
return ret;
/* Load the NFS protocol module if we haven't done so yet */
if (!ctx->nfs_mod) {
nfs_mod = get_nfs_version(ctx->version);
if (IS_ERR(nfs_mod)) {
ret = PTR_ERR(nfs_mod);
goto out_version_unavailable;
}
ctx->nfs_mod = nfs_mod;
}
/* Ensure the filesystem context has the correct fs_type */
if (fc->fs_type != ctx->nfs_mod->nfs_fs) {
module_put(fc->fs_type->owner);
__module_get(ctx->nfs_mod->nfs_fs->owner);
fc->fs_type = ctx->nfs_mod->nfs_fs;
}
return 0;
out_no_device_name:
return nfs_invalf(fc, "NFS: Device name not specified");
out_v4_not_compiled:
nfs_errorf(fc, "NFS: NFSv4 is not compiled into kernel");
return -EPROTONOSUPPORT;
out_invalid_transport_udp:
return nfs_invalf(fc, "NFS: Unsupported transport protocol udp");
out_no_address:
return nfs_invalf(fc, "NFS: mount program didn't pass remote address");
out_mountproto_mismatch:
return nfs_invalf(fc, "NFS: Mount server address does not match mountproto= option");
out_proto_mismatch:
return nfs_invalf(fc, "NFS: Server address does not match proto= option");
out_minorversion_mismatch:
return nfs_invalf(fc, "NFS: Mount option vers=%u does not support minorversion=%u",
ctx->version, ctx->minorversion);
out_migration_misuse:
return nfs_invalf(fc, "NFS: 'Migration' not supported for this NFS version");
out_version_unavailable:
nfs_errorf(fc, "NFS: Version unavailable");
return ret;
}
/*
* Create an NFS superblock by the appropriate method.
*/
static int nfs_get_tree(struct fs_context *fc)
{
struct nfs_fs_context *ctx = nfs_fc2context(fc);
int err = nfs_fs_context_validate(fc);
if (err)
return err;
if (!ctx->internal)
return ctx->nfs_mod->rpc_ops->try_get_tree(fc);
else
return nfs_get_tree_common(fc);
}
/*
* Handle duplication of a configuration. The caller copied *src into *sc, but
* it can't deal with resource pointers in the filesystem context, so we have
* to do that. We need to clear pointers, copy data or get extra refs as
* appropriate.
*/
static int nfs_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)
{
struct nfs_fs_context *src = nfs_fc2context(src_fc), *ctx;
ctx = kmemdup(src, sizeof(struct nfs_fs_context), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->mntfh = nfs_alloc_fhandle();
if (!ctx->mntfh) {
kfree(ctx);
return -ENOMEM;
}
nfs_copy_fh(ctx->mntfh, src->mntfh);
__module_get(ctx->nfs_mod->owner);
ctx->client_address = NULL;
ctx->mount_server.hostname = NULL;
ctx->nfs_server.export_path = NULL;
ctx->nfs_server.hostname = NULL;
ctx->fscache_uniq = NULL;
ctx->clone_data.fattr = NULL;
fc->fs_private = ctx;
return 0;
}
static void nfs_fs_context_free(struct fs_context *fc)
{
struct nfs_fs_context *ctx = nfs_fc2context(fc);
if (ctx) {
if (ctx->server)
nfs_free_server(ctx->server);
if (ctx->nfs_mod)
put_nfs_version(ctx->nfs_mod);
kfree(ctx->client_address);
kfree(ctx->mount_server.hostname);
kfree(ctx->nfs_server.export_path);
kfree(ctx->nfs_server.hostname);
kfree(ctx->fscache_uniq);
nfs_free_fhandle(ctx->mntfh);
nfs_free_fattr(ctx->clone_data.fattr);
kfree(ctx);
}
}
static const struct fs_context_operations nfs_fs_context_ops = {
.free = nfs_fs_context_free,
.dup = nfs_fs_context_dup,
.parse_param = nfs_fs_context_parse_param,
.parse_monolithic = nfs_fs_context_parse_monolithic,
.get_tree = nfs_get_tree,
.reconfigure = nfs_reconfigure,
};
/*
* Prepare superblock configuration. We use the namespaces attached to the
* context. This may be the current process's namespaces, or it may be a
* container's namespaces.
*/
static int nfs_init_fs_context(struct fs_context *fc)
{
struct nfs_fs_context *ctx;
ctx = kzalloc(sizeof(struct nfs_fs_context), GFP_KERNEL);
if (unlikely(!ctx))
return -ENOMEM;
ctx->mntfh = nfs_alloc_fhandle();
if (unlikely(!ctx->mntfh)) {
kfree(ctx);
return -ENOMEM;
}
ctx->protofamily = AF_UNSPEC;
ctx->mountfamily = AF_UNSPEC;
ctx->mount_server.port = NFS_UNSPEC_PORT;
if (fc->root) {
/* reconfigure, start with the current config */
struct nfs_server *nfss = fc->root->d_sb->s_fs_info;
struct net *net = nfss->nfs_client->cl_net;
ctx->flags = nfss->flags;
ctx->rsize = nfss->rsize;
ctx->wsize = nfss->wsize;
ctx->retrans = nfss->client->cl_timeout->to_retries;
ctx->selected_flavor = nfss->client->cl_auth->au_flavor;
ctx->acregmin = nfss->acregmin / HZ;
ctx->acregmax = nfss->acregmax / HZ;
ctx->acdirmin = nfss->acdirmin / HZ;
ctx->acdirmax = nfss->acdirmax / HZ;
ctx->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
ctx->nfs_server.port = nfss->port;
ctx->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
ctx->version = nfss->nfs_client->rpc_ops->version;
ctx->minorversion = nfss->nfs_client->cl_minorversion;
memcpy(&ctx->nfs_server.address, &nfss->nfs_client->cl_addr,
ctx->nfs_server.addrlen);
if (fc->net_ns != net) {
put_net(fc->net_ns);
fc->net_ns = get_net(net);
}
ctx->nfs_mod = nfss->nfs_client->cl_nfs_mod;
__module_get(ctx->nfs_mod->owner);
} else {
/* defaults */
ctx->timeo = NFS_UNSPEC_TIMEO;
ctx->retrans = NFS_UNSPEC_RETRANS;
ctx->acregmin = NFS_DEF_ACREGMIN;
ctx->acregmax = NFS_DEF_ACREGMAX;
ctx->acdirmin = NFS_DEF_ACDIRMIN;
ctx->acdirmax = NFS_DEF_ACDIRMAX;
ctx->nfs_server.port = NFS_UNSPEC_PORT;
ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
ctx->selected_flavor = RPC_AUTH_MAXFLAVOR;
ctx->minorversion = 0;
ctx->need_mount = true;
}
fc->fs_private = ctx;
fc->ops = &nfs_fs_context_ops;
return 0;
}
struct file_system_type nfs_fs_type = {
.owner = THIS_MODULE,
.name = "nfs",
.init_fs_context = nfs_init_fs_context,
.parameters = nfs_fs_parameters,
.kill_sb = nfs_kill_super,
.fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
};
MODULE_ALIAS_FS("nfs");
EXPORT_SYMBOL_GPL(nfs_fs_type);
#if IS_ENABLED(CONFIG_NFS_V4)
struct file_system_type nfs4_fs_type = {
.owner = THIS_MODULE,
.name = "nfs4",
.init_fs_context = nfs_init_fs_context,
.parameters = nfs_fs_parameters,
.kill_sb = nfs_kill_super,
.fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
};
MODULE_ALIAS_FS("nfs4");
MODULE_ALIAS("nfs4");
EXPORT_SYMBOL_GPL(nfs4_fs_type);
#endif /* CONFIG_NFS_V4 */
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