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linux/fs/cifs/fs_context.h
Paulo Alcantara a1c0d00572 cifs: share dfs connections and supers 
When matching DFS superblocks we can't rely on either the server's
address or tcon's UNC name from mount(2) as the existing servers and
tcons might be connected to somewhere else.  Instead, check if
superblock is dfs, and if so, match its original source pathname with
the new mount's source pathname.

For DFS connections, instead of checking server's address, match its
referral path as it could be connected to different targets.

Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
2022-12-19 08:03:12 -06:00

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2020, Microsoft Corporation.
*
* Author(s): Steve French <stfrench@microsoft.com>
* David Howells <dhowells@redhat.com>
*/
#ifndef _FS_CONTEXT_H
#define _FS_CONTEXT_H
#include "cifsglob.h"
#include <linux/parser.h>
#include <linux/fs_parser.h>
/* Log errors in fs_context (new mount api) but also in dmesg (old style) */
#define cifs_errorf(fc, fmt, ...) \
do { \
errorf(fc, fmt, ## __VA_ARGS__); \
cifs_dbg(VFS, fmt, ## __VA_ARGS__); \
} while (0)
enum smb_version {
Smb_1 = 1,
Smb_20,
Smb_21,
Smb_30,
Smb_302,
Smb_311,
Smb_3any,
Smb_default,
Smb_version_err
};
enum {
Opt_cache_loose,
Opt_cache_strict,
Opt_cache_none,
Opt_cache_ro,
Opt_cache_rw,
Opt_cache_err
};
enum cifs_sec_param {
Opt_sec_krb5,
Opt_sec_krb5i,
Opt_sec_krb5p,
Opt_sec_ntlmsspi,
Opt_sec_ntlmssp,
Opt_sec_ntlmv2,
Opt_sec_ntlmv2i,
Opt_sec_none,
Opt_sec_err
};
enum cifs_param {
/* Mount options that take no arguments */
Opt_user_xattr,
Opt_forceuid,
Opt_forcegid,
Opt_noblocksend,
Opt_noautotune,
Opt_nolease,
Opt_nosparse,
Opt_hard,
Opt_soft,
Opt_perm,
Opt_nodelete,
Opt_mapposix,
Opt_mapchars,
Opt_nomapchars,
Opt_sfu,
Opt_nodfs,
Opt_posixpaths,
Opt_unix,
Opt_nocase,
Opt_brl,
Opt_handlecache,
Opt_forcemandatorylock,
Opt_setuidfromacl,
Opt_setuids,
Opt_dynperm,
Opt_intr,
Opt_strictsync,
Opt_serverino,
Opt_rwpidforward,
Opt_cifsacl,
Opt_acl,
Opt_locallease,
Opt_sign,
Opt_ignore_signature,
Opt_seal,
Opt_noac,
Opt_fsc,
Opt_mfsymlinks,
Opt_multiuser,
Opt_sloppy,
Opt_nosharesock,
Opt_persistent,
Opt_resilient,
Opt_tcp_nodelay,
Opt_domainauto,
Opt_rdma,
Opt_modesid,
Opt_rootfs,
Opt_multichannel,
Opt_compress,
Opt_witness,
/* Mount options which take numeric value */
Opt_backupuid,
Opt_backupgid,
Opt_uid,
Opt_cruid,
Opt_gid,
Opt_port,
Opt_file_mode,
Opt_dirmode,
Opt_min_enc_offload,
Opt_blocksize,
Opt_rasize,
Opt_rsize,
Opt_wsize,
Opt_actimeo,
Opt_acdirmax,
Opt_acregmax,
Opt_closetimeo,
Opt_echo_interval,
Opt_max_credits,
Opt_snapshot,
Opt_max_channels,
Opt_handletimeout,
/* Mount options which take string value */
Opt_source,
Opt_user,
Opt_pass,
Opt_ip,
Opt_domain,
Opt_srcaddr,
Opt_iocharset,
Opt_netbiosname,
Opt_servern,
Opt_ver,
Opt_vers,
Opt_sec,
Opt_cache,
/* Mount options to be ignored */
Opt_ignore,
Opt_err
};
struct smb3_fs_context {
bool uid_specified;
bool cruid_specified;
bool gid_specified;
bool sloppy;
bool got_ip;
bool got_version;
bool got_rsize;
bool got_wsize;
bool got_bsize;
unsigned short port;
char *username;
char *password;
char *domainname;
char *source;
char *server_hostname;
char *UNC;
char *nodename;
char workstation_name[CIFS_MAX_WORKSTATION_LEN];
char *iocharset; /* local code page for mapping to and from Unicode */
char source_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* clnt nb name */
char target_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* srvr nb name */
kuid_t cred_uid;
kuid_t linux_uid;
kgid_t linux_gid;
kuid_t backupuid;
kgid_t backupgid;
umode_t file_mode;
umode_t dir_mode;
enum securityEnum sectype; /* sectype requested via mnt opts */
bool sign; /* was signing requested via mnt opts? */
bool ignore_signature:1;
bool retry:1;
bool intr:1;
bool setuids:1;
bool setuidfromacl:1;
bool override_uid:1;
bool override_gid:1;
bool dynperm:1;
bool noperm:1;
bool nodelete:1;
bool mode_ace:1;
bool no_psx_acl:1; /* set if posix acl support should be disabled */
bool cifs_acl:1;
bool backupuid_specified; /* mount option backupuid is specified */
bool backupgid_specified; /* mount option backupgid is specified */
bool no_xattr:1; /* set if xattr (EA) support should be disabled*/
bool server_ino:1; /* use inode numbers from server ie UniqueId */
bool direct_io:1;
bool strict_io:1; /* strict cache behavior */
bool cache_ro:1;
bool cache_rw:1;
bool remap:1; /* set to remap seven reserved chars in filenames */
bool sfu_remap:1; /* remap seven reserved chars ala SFU */
bool posix_paths:1; /* unset to not ask for posix pathnames. */
bool no_linux_ext:1;
bool linux_ext:1;
bool sfu_emul:1;
bool nullauth:1; /* attempt to authenticate with null user */
bool nocase:1; /* request case insensitive filenames */
bool nobrl:1; /* disable sending byte range locks to srv */
bool nohandlecache:1; /* disable caching dir handles if srvr probs */
bool mand_lock:1; /* send mandatory not posix byte range lock reqs */
bool seal:1; /* request transport encryption on share */
bool nodfs:1; /* Do not request DFS, even if available */
bool local_lease:1; /* check leases only on local system, not remote */
bool noblocksnd:1;
bool noautotune:1;
bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
bool no_lease:1; /* disable requesting leases */
bool no_sparse:1; /* do not attempt to set files sparse */
bool fsc:1; /* enable fscache */
bool mfsymlinks:1; /* use Minshall+French Symlinks */
bool multiuser:1;
bool rwpidforward:1; /* pid forward for read/write operations */
bool nosharesock:1;
bool persistent:1;
bool nopersistent:1;
bool resilient:1; /* noresilient not required since not fored for CA */
bool domainauto:1;
bool rdma:1;
bool multichannel:1;
bool use_client_guid:1;
/* reuse existing guid for multichannel */
u8 client_guid[SMB2_CLIENT_GUID_SIZE];
unsigned int bsize;
unsigned int rasize;
unsigned int rsize;
unsigned int wsize;
unsigned int min_offload;
bool sockopt_tcp_nodelay:1;
/* attribute cache timemout for files and directories in jiffies */
unsigned long acregmax;
unsigned long acdirmax;
/* timeout for deferred close of files in jiffies */
unsigned long closetimeo;
struct smb_version_operations *ops;
struct smb_version_values *vals;
char *prepath;
struct sockaddr_storage dstaddr; /* destination address */
struct sockaddr_storage srcaddr; /* allow binding to a local IP */
struct nls_table *local_nls; /* This is a copy of the pointer in cifs_sb */
unsigned int echo_interval; /* echo interval in secs */
__u64 snapshot_time; /* needed for timewarp tokens */
__u32 handle_timeout; /* persistent and durable handle timeout in ms */
unsigned int max_credits; /* smb3 max_credits 10 < credits < 60000 */
unsigned int max_channels;
__u16 compression; /* compression algorithm 0xFFFF default 0=disabled */
bool rootfs:1; /* if it's a SMB root file system */
bool witness:1; /* use witness protocol */
char *leaf_fullpath;
};
extern const struct fs_parameter_spec smb3_fs_parameters[];
extern int smb3_init_fs_context(struct fs_context *fc);
extern void smb3_cleanup_fs_context_contents(struct smb3_fs_context *ctx);
extern void smb3_cleanup_fs_context(struct smb3_fs_context *ctx);
static inline struct smb3_fs_context *smb3_fc2context(const struct fs_context *fc)
{
return fc->fs_private;
}
extern int smb3_fs_context_dup(struct smb3_fs_context *new_ctx, struct smb3_fs_context *ctx);
extern void smb3_update_mnt_flags(struct cifs_sb_info *cifs_sb);
/*
* max deferred close timeout (jiffies) - 2^30
*/
#define SMB3_MAX_DCLOSETIMEO (1 << 30)
#define SMB3_DEF_DCLOSETIMEO (5 * HZ) /* Can increase later, other clients use larger */
#endif
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