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![Hawkins Jiawei](/assets/img/avatar_default.png)
According to commit "vfs: parse: deal with zero length string value", kernel will set the param->string to null pointer in vfs_parse_fs_string() if fs string has zero length. Yet the problem is that, nfs_fs_context_parse_param() will dereferences the param->string, without checking whether it is a null pointer, which may trigger a null-ptr-deref bug. This patch solves it by adding sanity check on param->string in nfs_fs_context_parse_param(). Signed-off-by: Hawkins Jiawei <yin31149@gmail.com> Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
1603 lines
40 KiB
C
1603 lines
40 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/fs/nfs/fs_context.c
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*
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* Copyright (C) 1992 Rick Sladkey
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* Conversion to new mount api Copyright (C) David Howells
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*
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* NFS mount handling.
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*
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* Split from fs/nfs/super.c by David Howells <dhowells@redhat.com>
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*/
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#include <linux/compat.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/fs_context.h>
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#include <linux/fs_parser.h>
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#include <linux/nfs_fs.h>
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#include <linux/nfs_mount.h>
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#include <linux/nfs4_mount.h>
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#include "nfs.h"
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#include "internal.h"
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#include "nfstrace.h"
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#define NFSDBG_FACILITY NFSDBG_MOUNT
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#if IS_ENABLED(CONFIG_NFS_V3)
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#define NFS_DEFAULT_VERSION 3
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#else
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#define NFS_DEFAULT_VERSION 2
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#endif
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#define NFS_MAX_CONNECTIONS 16
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enum nfs_param {
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Opt_ac,
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Opt_acdirmax,
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Opt_acdirmin,
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Opt_acl,
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Opt_acregmax,
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Opt_acregmin,
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Opt_actimeo,
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Opt_addr,
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Opt_bg,
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Opt_bsize,
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Opt_clientaddr,
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Opt_cto,
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Opt_fg,
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Opt_fscache,
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Opt_fscache_flag,
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Opt_hard,
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Opt_intr,
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Opt_local_lock,
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Opt_lock,
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Opt_lookupcache,
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Opt_migration,
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Opt_minorversion,
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Opt_mountaddr,
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Opt_mounthost,
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Opt_mountport,
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Opt_mountproto,
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Opt_mountvers,
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Opt_namelen,
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Opt_nconnect,
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Opt_max_connect,
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Opt_port,
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Opt_posix,
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Opt_proto,
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Opt_rdirplus,
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Opt_rdma,
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Opt_resvport,
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Opt_retrans,
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Opt_retry,
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Opt_rsize,
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Opt_sec,
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Opt_sharecache,
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Opt_sloppy,
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Opt_soft,
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Opt_softerr,
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Opt_softreval,
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Opt_source,
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Opt_tcp,
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Opt_timeo,
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Opt_trunkdiscovery,
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Opt_udp,
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Opt_v,
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Opt_vers,
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Opt_wsize,
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Opt_write,
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};
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enum {
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Opt_local_lock_all,
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Opt_local_lock_flock,
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Opt_local_lock_none,
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Opt_local_lock_posix,
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};
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static const struct constant_table nfs_param_enums_local_lock[] = {
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{ "all", Opt_local_lock_all },
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{ "flock", Opt_local_lock_flock },
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{ "posix", Opt_local_lock_posix },
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{ "none", Opt_local_lock_none },
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{}
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};
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enum {
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Opt_lookupcache_all,
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Opt_lookupcache_none,
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Opt_lookupcache_positive,
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};
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static const struct constant_table nfs_param_enums_lookupcache[] = {
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{ "all", Opt_lookupcache_all },
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{ "none", Opt_lookupcache_none },
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{ "pos", Opt_lookupcache_positive },
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{ "positive", Opt_lookupcache_positive },
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{}
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};
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enum {
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Opt_write_lazy,
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Opt_write_eager,
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Opt_write_wait,
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};
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static const struct constant_table nfs_param_enums_write[] = {
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{ "lazy", Opt_write_lazy },
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{ "eager", Opt_write_eager },
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{ "wait", Opt_write_wait },
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{}
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};
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static const struct fs_parameter_spec nfs_fs_parameters[] = {
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fsparam_flag_no("ac", Opt_ac),
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fsparam_u32 ("acdirmax", Opt_acdirmax),
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fsparam_u32 ("acdirmin", Opt_acdirmin),
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fsparam_flag_no("acl", Opt_acl),
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fsparam_u32 ("acregmax", Opt_acregmax),
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fsparam_u32 ("acregmin", Opt_acregmin),
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fsparam_u32 ("actimeo", Opt_actimeo),
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fsparam_string("addr", Opt_addr),
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fsparam_flag ("bg", Opt_bg),
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fsparam_u32 ("bsize", Opt_bsize),
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fsparam_string("clientaddr", Opt_clientaddr),
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fsparam_flag_no("cto", Opt_cto),
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fsparam_flag ("fg", Opt_fg),
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fsparam_flag_no("fsc", Opt_fscache_flag),
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fsparam_string("fsc", Opt_fscache),
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fsparam_flag ("hard", Opt_hard),
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__fsparam(NULL, "intr", Opt_intr,
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fs_param_neg_with_no|fs_param_deprecated, NULL),
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fsparam_enum ("local_lock", Opt_local_lock, nfs_param_enums_local_lock),
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fsparam_flag_no("lock", Opt_lock),
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fsparam_enum ("lookupcache", Opt_lookupcache, nfs_param_enums_lookupcache),
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fsparam_flag_no("migration", Opt_migration),
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fsparam_u32 ("minorversion", Opt_minorversion),
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fsparam_string("mountaddr", Opt_mountaddr),
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fsparam_string("mounthost", Opt_mounthost),
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fsparam_u32 ("mountport", Opt_mountport),
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fsparam_string("mountproto", Opt_mountproto),
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fsparam_u32 ("mountvers", Opt_mountvers),
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fsparam_u32 ("namlen", Opt_namelen),
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fsparam_u32 ("nconnect", Opt_nconnect),
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fsparam_u32 ("max_connect", Opt_max_connect),
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fsparam_string("nfsvers", Opt_vers),
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fsparam_u32 ("port", Opt_port),
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fsparam_flag_no("posix", Opt_posix),
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fsparam_string("proto", Opt_proto),
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fsparam_flag_no("rdirplus", Opt_rdirplus),
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fsparam_flag ("rdma", Opt_rdma),
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fsparam_flag_no("resvport", Opt_resvport),
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fsparam_u32 ("retrans", Opt_retrans),
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fsparam_string("retry", Opt_retry),
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fsparam_u32 ("rsize", Opt_rsize),
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fsparam_string("sec", Opt_sec),
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fsparam_flag_no("sharecache", Opt_sharecache),
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fsparam_flag ("sloppy", Opt_sloppy),
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fsparam_flag ("soft", Opt_soft),
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fsparam_flag ("softerr", Opt_softerr),
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fsparam_flag ("softreval", Opt_softreval),
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fsparam_string("source", Opt_source),
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fsparam_flag ("tcp", Opt_tcp),
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fsparam_u32 ("timeo", Opt_timeo),
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fsparam_flag_no("trunkdiscovery", Opt_trunkdiscovery),
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fsparam_flag ("udp", Opt_udp),
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fsparam_flag ("v2", Opt_v),
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fsparam_flag ("v3", Opt_v),
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fsparam_flag ("v4", Opt_v),
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fsparam_flag ("v4.0", Opt_v),
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fsparam_flag ("v4.1", Opt_v),
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fsparam_flag ("v4.2", Opt_v),
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fsparam_string("vers", Opt_vers),
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fsparam_enum ("write", Opt_write, nfs_param_enums_write),
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fsparam_u32 ("wsize", Opt_wsize),
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{}
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};
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enum {
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Opt_vers_2,
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Opt_vers_3,
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Opt_vers_4,
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Opt_vers_4_0,
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Opt_vers_4_1,
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Opt_vers_4_2,
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};
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static const struct constant_table nfs_vers_tokens[] = {
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{ "2", Opt_vers_2 },
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{ "3", Opt_vers_3 },
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{ "4", Opt_vers_4 },
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{ "4.0", Opt_vers_4_0 },
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{ "4.1", Opt_vers_4_1 },
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{ "4.2", Opt_vers_4_2 },
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{}
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};
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enum {
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Opt_xprt_rdma,
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Opt_xprt_rdma6,
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Opt_xprt_tcp,
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Opt_xprt_tcp6,
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Opt_xprt_udp,
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Opt_xprt_udp6,
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nr__Opt_xprt
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};
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static const struct constant_table nfs_xprt_protocol_tokens[] = {
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{ "rdma", Opt_xprt_rdma },
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{ "rdma6", Opt_xprt_rdma6 },
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{ "tcp", Opt_xprt_tcp },
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{ "tcp6", Opt_xprt_tcp6 },
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{ "udp", Opt_xprt_udp },
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{ "udp6", Opt_xprt_udp6 },
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{}
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};
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enum {
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Opt_sec_krb5,
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Opt_sec_krb5i,
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Opt_sec_krb5p,
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Opt_sec_lkey,
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Opt_sec_lkeyi,
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Opt_sec_lkeyp,
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Opt_sec_none,
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Opt_sec_spkm,
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Opt_sec_spkmi,
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Opt_sec_spkmp,
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Opt_sec_sys,
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nr__Opt_sec
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};
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static const struct constant_table nfs_secflavor_tokens[] = {
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{ "krb5", Opt_sec_krb5 },
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{ "krb5i", Opt_sec_krb5i },
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{ "krb5p", Opt_sec_krb5p },
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{ "lkey", Opt_sec_lkey },
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{ "lkeyi", Opt_sec_lkeyi },
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{ "lkeyp", Opt_sec_lkeyp },
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{ "none", Opt_sec_none },
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{ "null", Opt_sec_none },
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{ "spkm3", Opt_sec_spkm },
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{ "spkm3i", Opt_sec_spkmi },
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{ "spkm3p", Opt_sec_spkmp },
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{ "sys", Opt_sec_sys },
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{}
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};
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/*
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* Sanity-check a server address provided by the mount command.
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*
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* Address family must be initialized, and address must not be
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* the ANY address for that family.
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*/
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static int nfs_verify_server_address(struct sockaddr_storage *addr)
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{
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switch (addr->ss_family) {
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case AF_INET: {
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struct sockaddr_in *sa = (struct sockaddr_in *)addr;
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return sa->sin_addr.s_addr != htonl(INADDR_ANY);
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}
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case AF_INET6: {
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struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
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return !ipv6_addr_any(sa);
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}
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}
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return 0;
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}
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#ifdef CONFIG_NFS_DISABLE_UDP_SUPPORT
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static bool nfs_server_transport_udp_invalid(const struct nfs_fs_context *ctx)
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{
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return true;
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}
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#else
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static bool nfs_server_transport_udp_invalid(const struct nfs_fs_context *ctx)
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{
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if (ctx->version == 4)
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return true;
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return false;
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}
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#endif
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/*
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* Sanity check the NFS transport protocol.
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*/
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static int nfs_validate_transport_protocol(struct fs_context *fc,
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struct nfs_fs_context *ctx)
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{
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switch (ctx->nfs_server.protocol) {
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case XPRT_TRANSPORT_UDP:
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if (nfs_server_transport_udp_invalid(ctx))
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goto out_invalid_transport_udp;
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break;
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case XPRT_TRANSPORT_TCP:
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case XPRT_TRANSPORT_RDMA:
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break;
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default:
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ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
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}
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return 0;
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out_invalid_transport_udp:
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return nfs_invalf(fc, "NFS: Unsupported transport protocol udp");
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}
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/*
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* For text based NFSv2/v3 mounts, the mount protocol transport default
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* settings should depend upon the specified NFS transport.
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*/
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static void nfs_set_mount_transport_protocol(struct nfs_fs_context *ctx)
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{
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if (ctx->mount_server.protocol == XPRT_TRANSPORT_UDP ||
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ctx->mount_server.protocol == XPRT_TRANSPORT_TCP)
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return;
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switch (ctx->nfs_server.protocol) {
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case XPRT_TRANSPORT_UDP:
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ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
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break;
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case XPRT_TRANSPORT_TCP:
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case XPRT_TRANSPORT_RDMA:
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ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
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}
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}
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/*
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* Add 'flavor' to 'auth_info' if not already present.
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* Returns true if 'flavor' ends up in the list, false otherwise
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*/
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static int nfs_auth_info_add(struct fs_context *fc,
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struct nfs_auth_info *auth_info,
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rpc_authflavor_t flavor)
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{
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unsigned int i;
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unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
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/* make sure this flavor isn't already in the list */
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for (i = 0; i < auth_info->flavor_len; i++) {
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if (flavor == auth_info->flavors[i])
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return 0;
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}
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if (auth_info->flavor_len + 1 >= max_flavor_len)
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return nfs_invalf(fc, "NFS: too many sec= flavors");
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auth_info->flavors[auth_info->flavor_len++] = flavor;
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return 0;
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}
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/*
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* Parse the value of the 'sec=' option.
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*/
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static int nfs_parse_security_flavors(struct fs_context *fc,
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struct fs_parameter *param)
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{
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struct nfs_fs_context *ctx = nfs_fc2context(fc);
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rpc_authflavor_t pseudoflavor;
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char *string = param->string, *p;
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int ret;
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trace_nfs_mount_assign(param->key, string);
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while ((p = strsep(&string, ":")) != NULL) {
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if (!*p)
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continue;
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switch (lookup_constant(nfs_secflavor_tokens, p, -1)) {
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case Opt_sec_none:
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pseudoflavor = RPC_AUTH_NULL;
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break;
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case Opt_sec_sys:
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pseudoflavor = RPC_AUTH_UNIX;
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break;
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case Opt_sec_krb5:
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pseudoflavor = RPC_AUTH_GSS_KRB5;
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break;
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case Opt_sec_krb5i:
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pseudoflavor = RPC_AUTH_GSS_KRB5I;
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break;
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case Opt_sec_krb5p:
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pseudoflavor = RPC_AUTH_GSS_KRB5P;
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break;
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case Opt_sec_lkey:
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pseudoflavor = RPC_AUTH_GSS_LKEY;
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break;
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case Opt_sec_lkeyi:
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pseudoflavor = RPC_AUTH_GSS_LKEYI;
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break;
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case Opt_sec_lkeyp:
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pseudoflavor = RPC_AUTH_GSS_LKEYP;
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break;
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case Opt_sec_spkm:
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pseudoflavor = RPC_AUTH_GSS_SPKM;
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break;
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case Opt_sec_spkmi:
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pseudoflavor = RPC_AUTH_GSS_SPKMI;
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break;
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case Opt_sec_spkmp:
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pseudoflavor = RPC_AUTH_GSS_SPKMP;
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break;
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default:
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return nfs_invalf(fc, "NFS: sec=%s option not recognized", p);
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}
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ret = nfs_auth_info_add(fc, &ctx->auth_info, pseudoflavor);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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static int nfs_parse_version_string(struct fs_context *fc,
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const char *string)
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{
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struct nfs_fs_context *ctx = nfs_fc2context(fc);
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ctx->flags &= ~NFS_MOUNT_VER3;
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switch (lookup_constant(nfs_vers_tokens, string, -1)) {
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case Opt_vers_2:
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ctx->version = 2;
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break;
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case Opt_vers_3:
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ctx->flags |= NFS_MOUNT_VER3;
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ctx->version = 3;
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break;
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case Opt_vers_4:
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/* Backward compatibility option. In future,
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* the mount program should always supply
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* a NFSv4 minor version number.
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*/
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ctx->version = 4;
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break;
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case Opt_vers_4_0:
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ctx->version = 4;
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ctx->minorversion = 0;
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break;
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case Opt_vers_4_1:
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ctx->version = 4;
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ctx->minorversion = 1;
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break;
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case Opt_vers_4_2:
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ctx->version = 4;
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ctx->minorversion = 2;
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break;
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default:
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return nfs_invalf(fc, "NFS: Unsupported NFS version");
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}
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return 0;
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}
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/*
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* Parse a single mount parameter.
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*/
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static int nfs_fs_context_parse_param(struct fs_context *fc,
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struct fs_parameter *param)
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{
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struct fs_parse_result result;
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struct nfs_fs_context *ctx = nfs_fc2context(fc);
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unsigned short protofamily, mountfamily;
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unsigned int len;
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int ret, opt;
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trace_nfs_mount_option(param);
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opt = fs_parse(fc, nfs_fs_parameters, param, &result);
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if (opt < 0)
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return (opt == -ENOPARAM && ctx->sloppy) ? 1 : opt;
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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:
|
|
if (!param->string)
|
|
goto out_invalid_value;
|
|
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:
|
|
if (!param->string)
|
|
goto out_invalid_value;
|
|
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:
|
|
if (!param->string)
|
|
goto out_invalid_value;
|
|
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_storage *sap = &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));
|
|
fallthrough;
|
|
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);
|
|
|
|
/*
|
|
* for proto == XPRT_TRANSPORT_UDP, which is what uses
|
|
* to_exponential, implying shift: limit the shift value
|
|
* to BITS_PER_LONG (majortimeo is unsigned long)
|
|
*/
|
|
if (!(data->flags & NFS_MOUNT_TCP)) /* this will be UDP */
|
|
if (data->retrans >= 64) /* shift value is too large */
|
|
goto out_invalid_data;
|
|
|
|
/*
|
|
* 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->ss_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;
|
|
}
|
|
|
|
ret = nfs_validate_transport_protocol(fc, ctx);
|
|
if (ret)
|
|
return ret;
|
|
|
|
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:
|
|
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");
|
|
|
|
out_invalid_data:
|
|
return nfs_invalf(fc, "NFS: invalid binary mount data");
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_NFS_V4)
|
|
struct compat_nfs_string {
|
|
compat_uint_t len;
|
|
compat_uptr_t data;
|
|
};
|
|
|
|
static inline void compat_nfs_string(struct nfs_string *dst,
|
|
struct compat_nfs_string *src)
|
|
{
|
|
dst->data = compat_ptr(src->data);
|
|
dst->len = src->len;
|
|
}
|
|
|
|
struct compat_nfs4_mount_data_v1 {
|
|
compat_int_t version;
|
|
compat_int_t flags;
|
|
compat_int_t rsize;
|
|
compat_int_t wsize;
|
|
compat_int_t timeo;
|
|
compat_int_t retrans;
|
|
compat_int_t acregmin;
|
|
compat_int_t acregmax;
|
|
compat_int_t acdirmin;
|
|
compat_int_t acdirmax;
|
|
struct compat_nfs_string client_addr;
|
|
struct compat_nfs_string mnt_path;
|
|
struct compat_nfs_string hostname;
|
|
compat_uint_t host_addrlen;
|
|
compat_uptr_t host_addr;
|
|
compat_int_t proto;
|
|
compat_int_t auth_flavourlen;
|
|
compat_uptr_t auth_flavours;
|
|
};
|
|
|
|
static void nfs4_compat_mount_data_conv(struct nfs4_mount_data *data)
|
|
{
|
|
struct compat_nfs4_mount_data_v1 *compat =
|
|
(struct compat_nfs4_mount_data_v1 *)data;
|
|
|
|
/* copy the fields backwards */
|
|
data->auth_flavours = compat_ptr(compat->auth_flavours);
|
|
data->auth_flavourlen = compat->auth_flavourlen;
|
|
data->proto = compat->proto;
|
|
data->host_addr = compat_ptr(compat->host_addr);
|
|
data->host_addrlen = compat->host_addrlen;
|
|
compat_nfs_string(&data->hostname, &compat->hostname);
|
|
compat_nfs_string(&data->mnt_path, &compat->mnt_path);
|
|
compat_nfs_string(&data->client_addr, &compat->client_addr);
|
|
data->acdirmax = compat->acdirmax;
|
|
data->acdirmin = compat->acdirmin;
|
|
data->acregmax = compat->acregmax;
|
|
data->acregmin = compat->acregmin;
|
|
data->retrans = compat->retrans;
|
|
data->timeo = compat->timeo;
|
|
data->wsize = compat->wsize;
|
|
data->rsize = compat->rsize;
|
|
data->flags = compat->flags;
|
|
data->version = compat->version;
|
|
}
|
|
|
|
/*
|
|
* 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_storage *sap = &ctx->nfs_server._address;
|
|
int ret;
|
|
char *c;
|
|
|
|
if (!data) {
|
|
if (is_remount_fc(fc))
|
|
goto done;
|
|
return nfs_invalf(fc,
|
|
"NFS4: mount program didn't pass any mount data");
|
|
}
|
|
|
|
ctx->version = 4;
|
|
|
|
if (data->version != 1)
|
|
return generic_parse_monolithic(fc, data);
|
|
|
|
if (in_compat_syscall())
|
|
nfs4_compat_mount_data_conv(data);
|
|
|
|
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;
|
|
trace_nfs_mount_path(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;
|
|
ret = nfs_validate_transport_protocol(fc, ctx);
|
|
if (ret)
|
|
return ret;
|
|
done:
|
|
ctx->skip_reconfig_option_check = true;
|
|
return 0;
|
|
|
|
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");
|
|
}
|
|
#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_storage *sap = &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;
|
|
|
|
ret = nfs_validate_transport_protocol(fc, ctx);
|
|
if (ret)
|
|
return ret;
|
|
|
|
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;
|
|
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);
|
|
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_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->s_iflags |= SB_I_STABLE_WRITES;
|
|
}
|
|
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 */
|