[linux.git] / fs / cifs / Kconfig

config CIFS
	tristate "CIFS support (advanced network filesystem, SMBFS successor)"
	depends on INET
	select NLS
	select CRYPTO
	select CRYPTO_MD4
	select CRYPTO_MD5
	select CRYPTO_HMAC
	select CRYPTO_ARC4
	select CRYPTO_ECB
	select CRYPTO_DES
	select CRYPTO_SHA256
	select CRYPTO_CMAC
	help
	  This is the client VFS module for the Common Internet File System
	  (CIFS) protocol which is the successor to the Server Message Block
	  (SMB) protocol, the native file sharing mechanism for most early
	  PC operating systems.  The CIFS protocol is fully supported by
	  file servers such as Windows 2000 (including Windows 2003, Windows 2008,
	  NT 4 and Windows XP) as well by Samba (which provides excellent CIFS
	  server support for Linux and many other operating systems). Limited
	  support for OS/2 and Windows ME and similar servers is provided as
	  well.

	  The cifs module provides an advanced network file system
	  client for mounting to CIFS compliant servers.  It includes
	  support for DFS (hierarchical name space), secure per-user
	  session establishment via Kerberos or NTLM or NTLMv2,
	  safe distributed caching (oplock), optional packet
	  signing, Unicode and other internationalization improvements.
	  If you need to mount to Samba or Windows from this machine, say Y.

config CIFS_STATS
        bool "CIFS statistics"
        depends on CIFS
        help
          Enabling this option will cause statistics for each server share
	  mounted by the cifs client to be displayed in /proc/fs/cifs/Stats

config CIFS_STATS2
	bool "Extended statistics"
	depends on CIFS_STATS
	help
	  Enabling this option will allow more detailed statistics on SMB
	  request timing to be displayed in /proc/fs/cifs/DebugData and also
	  allow optional logging of slow responses to dmesg (depending on the
	  value of /proc/fs/cifs/cifsFYI, see fs/cifs/README for more details).
	  These additional statistics may have a minor effect on performance
	  and memory utilization.

	  Unless you are a developer or are doing network performance analysis
	  or tuning, say N.

config CIFS_WEAK_PW_HASH
	bool "Support legacy servers which use weaker LANMAN security"
	depends on CIFS
	help
	  Modern CIFS servers including Samba and most Windows versions
	  (since 1997) support stronger NTLM (and even NTLMv2 and Kerberos)
	  security mechanisms. These hash the password more securely
	  than the mechanisms used in the older LANMAN version of the
	  SMB protocol but LANMAN based authentication is needed to
	  establish sessions with some old SMB servers.

	  Enabling this option allows the cifs module to mount to older
	  LANMAN based servers such as OS/2 and Windows 95, but such
	  mounts may be less secure than mounts using NTLM or more recent
	  security mechanisms if you are on a public network.  Unless you
	  have a need to access old SMB servers (and are on a private
	  network) you probably want to say N.  Even if this support
	  is enabled in the kernel build, LANMAN authentication will not be
	  used automatically. At runtime LANMAN mounts are disabled but
	  can be set to required (or optional) either in
	  /proc/fs/cifs (see fs/cifs/README for more detail) or via an
	  option on the mount command. This support is disabled by
	  default in order to reduce the possibility of a downgrade
	  attack.

	  If unsure, say N.

config CIFS_UPCALL
	bool "Kerberos/SPNEGO advanced session setup"
	depends on CIFS && KEYS
	select DNS_RESOLVER
	help
	  Enables an upcall mechanism for CIFS which accesses userspace helper
	  utilities to provide SPNEGO packaged (RFC 4178) Kerberos tickets
	  which are needed to mount to certain secure servers (for which more
	  secure Kerberos authentication is required). If unsure, say N.

config CIFS_XATTR
        bool "CIFS extended attributes"
        depends on CIFS
        help
          Extended attributes are name:value pairs associated with inodes by
          the kernel or by users (see the attr(5) manual page, or visit
          <http://acl.bestbits.at/> for details).  CIFS maps the name of
          extended attributes beginning with the user namespace prefix
          to SMB/CIFS EAs. EAs are stored on Windows servers without the
          user namespace prefix, but their names are seen by Linux cifs clients
          prefaced by the user namespace prefix. The system namespace
          (used by some filesystems to store ACLs) is not supported at
          this time.

          If unsure, say N.

config CIFS_POSIX
        bool "CIFS POSIX Extensions"
        depends on CIFS_XATTR
        help
          Enabling this option will cause the cifs client to attempt to
	  negotiate a newer dialect with servers, such as Samba 3.0.5
	  or later, that optionally can handle more POSIX like (rather
	  than Windows like) file behavior.  It also enables
	  support for POSIX ACLs (getfacl and setfacl) to servers
	  (such as Samba 3.10 and later) which can negotiate
	  CIFS POSIX ACL support.  If unsure, say N.

config CIFS_ACL
	  bool "Provide CIFS ACL support"
	  depends on CIFS_XATTR && KEYS
	  help
	    Allows fetching CIFS/NTFS ACL from the server.  The DACL blob
	    is handed over to the application/caller.

config CIFS_DEBUG
	bool "Enable CIFS debugging routines"
	default y
	depends on CIFS
	help
	   Enabling this option adds helpful debugging messages to
	   the cifs code which increases the size of the cifs module.
	   If unsure, say Y.
config CIFS_DEBUG2
	bool "Enable additional CIFS debugging routines"
	depends on CIFS_DEBUG
	help
	   Enabling this option adds a few more debugging routines
	   to the cifs code which slightly increases the size of
	   the cifs module and can cause additional logging of debug
	   messages in some error paths, slowing performance. This
	   option can be turned off unless you are debugging
	   cifs problems.  If unsure, say N.

config CIFS_DFS_UPCALL
	  bool "DFS feature support"
	  depends on CIFS && KEYS
	  select DNS_RESOLVER
	  help
	    Distributed File System (DFS) support is used to access shares
	    transparently in an enterprise name space, even if the share
	    moves to a different server.  This feature also enables
	    an upcall mechanism for CIFS which contacts userspace helper
	    utilities to provide server name resolution (host names to
	    IP addresses) which is needed for implicit mounts of DFS junction
	    points. If unsure, say N.

config CIFS_NFSD_EXPORT
	  bool "Allow nfsd to export CIFS file system"
	  depends on CIFS && BROKEN
	  help
	   Allows NFS server to export a CIFS mounted share (nfsd over cifs)

config CIFS_SMB2
	bool "SMB2 network file system support"
	depends on CIFS && INET
	select NLS
	select KEYS
	select FSCACHE
	select DNS_RESOLVER

	help
	  This enables experimental support for the SMB2 (Server Message Block
	  version 2) protocol. The SMB2 protocol is the successor to the
	  popular CIFS and SMB network file sharing protocols. SMB2 is the
	  native file sharing mechanism for recent versions of Windows
	  operating systems (since Vista).  SMB2 enablement will eventually
	  allow users better performance, security and features, than would be
	  possible with cifs. Note that smb2 mount options also are simpler
	  (compared to cifs) due to protocol improvements.

	  Unless you are a developer or tester, say N.

config CIFS_FSCACHE
	  bool "Provide CIFS client caching support"
	  depends on CIFS=m && FSCACHE || CIFS=y && FSCACHE=y
	  help
	    Makes CIFS FS-Cache capable. Say Y here if you want your CIFS data
	    to be cached locally on disk through the general filesystem cache
	    manager. If unsure, say N.
Commit	Line	Data
bb26b963 AD	1	config CIFS
	2	tristate "CIFS support (advanced network filesystem, SMBFS successor)"
	3	depends on INET
	4	select NLS
d2b91521	5	select CRYPTO
f855f6cb	6	select CRYPTO_MD4
d2b91521	7	select CRYPTO_MD5
362d3129	8	select CRYPTO_HMAC
d2b91521	9	select CRYPTO_ARC4
5f0b23ee	10	select CRYPTO_ECB
43988d76	11	select CRYPTO_DES
3c1bf7e4	12	select CRYPTO_SHA256
429b46f4	13	select CRYPTO_CMAC
bb26b963 AD	14	help
	15	This is the client VFS module for the Common Internet File System
	16	(CIFS) protocol which is the successor to the Server Message Block
	17	(SMB) protocol, the native file sharing mechanism for most early
	18	PC operating systems. The CIFS protocol is fully supported by
1d4ab907 SF	19	file servers such as Windows 2000 (including Windows 2003, Windows 2008,
1d4ab907 SF	20	NT 4 and Windows XP) as well by Samba (which provides excellent CIFS
bb26b963 AD	21	server support for Linux and many other operating systems). Limited
	22	support for OS/2 and Windows ME and similar servers is provided as
	23	well.
	24
	25	The cifs module provides an advanced network file system
	26	client for mounting to CIFS compliant servers. It includes
	27	support for DFS (hierarchical name space), secure per-user
	28	session establishment via Kerberos or NTLM or NTLMv2,
	29	safe distributed caching (oplock), optional packet
	30	signing, Unicode and other internationalization improvements.
	31	If you need to mount to Samba or Windows from this machine, say Y.
	32
	33	config CIFS_STATS
	34	bool "CIFS statistics"
	35	depends on CIFS
	36	help
	37	Enabling this option will cause statistics for each server share
	38	mounted by the cifs client to be displayed in /proc/fs/cifs/Stats
	39
	40	config CIFS_STATS2
	41	bool "Extended statistics"
	42	depends on CIFS_STATS
	43	help
	44	Enabling this option will allow more detailed statistics on SMB
	45	request timing to be displayed in /proc/fs/cifs/DebugData and also
	46	allow optional logging of slow responses to dmesg (depending on the
	47	value of /proc/fs/cifs/cifsFYI, see fs/cifs/README for more details).
	48	These additional statistics may have a minor effect on performance
	49	and memory utilization.
	50
	51	Unless you are a developer or are doing network performance analysis
	52	or tuning, say N.
	53
	54	config CIFS_WEAK_PW_HASH
	55	bool "Support legacy servers which use weaker LANMAN security"
	56	depends on CIFS
	57	help
	58	Modern CIFS servers including Samba and most Windows versions
	59	(since 1997) support stronger NTLM (and even NTLMv2 and Kerberos)
	60	security mechanisms. These hash the password more securely
	61	than the mechanisms used in the older LANMAN version of the
	62	SMB protocol but LANMAN based authentication is needed to
	63	establish sessions with some old SMB servers.
	64
	65	Enabling this option allows the cifs module to mount to older
	66	LANMAN based servers such as OS/2 and Windows 95, but such
	67	mounts may be less secure than mounts using NTLM or more recent
	68	security mechanisms if you are on a public network. Unless you
	69	have a need to access old SMB servers (and are on a private
	70	network) you probably want to say N. Even if this support
	71	is enabled in the kernel build, LANMAN authentication will not be
	72	used automatically. At runtime LANMAN mounts are disabled but
	73	can be set to required (or optional) either in
	74	/proc/fs/cifs (see fs/cifs/README for more detail) or via an
	75	option on the mount command. This support is disabled by
	76	default in order to reduce the possibility of a downgrade
	77	attack.
	78
	79	If unsure, say N.
	80
	81	config CIFS_UPCALL
1a4240f4 WL	82	bool "Kerberos/SPNEGO advanced session setup"
	83	depends on CIFS && KEYS
	84	select DNS_RESOLVER
	85	help
	86	Enables an upcall mechanism for CIFS which accesses userspace helper
	87	utilities to provide SPNEGO packaged (RFC 4178) Kerberos tickets
	88	which are needed to mount to certain secure servers (for which more
	89	secure Kerberos authentication is required). If unsure, say N.
bb26b963 AD	90
	91	config CIFS_XATTR
	92	bool "CIFS extended attributes"
	93	depends on CIFS
	94	help
	95	Extended attributes are name:value pairs associated with inodes by
	96	the kernel or by users (see the attr(5) manual page, or visit
	97	<http://acl.bestbits.at/> for details). CIFS maps the name of
	98	extended attributes beginning with the user namespace prefix
	99	to SMB/CIFS EAs. EAs are stored on Windows servers without the
	100	user namespace prefix, but their names are seen by Linux cifs clients
	101	prefaced by the user namespace prefix. The system namespace
	102	(used by some filesystems to store ACLs) is not supported at
	103	this time.
	104
	105	If unsure, say N.
	106
	107	config CIFS_POSIX
	108	bool "CIFS POSIX Extensions"
	109	depends on CIFS_XATTR
	110	help
	111	Enabling this option will cause the cifs client to attempt to
	112	negotiate a newer dialect with servers, such as Samba 3.0.5
	113	or later, that optionally can handle more POSIX like (rather
	114	than Windows like) file behavior. It also enables
	115	support for POSIX ACLs (getfacl and setfacl) to servers
	116	(such as Samba 3.10 and later) which can negotiate
	117	CIFS POSIX ACL support. If unsure, say N.
	118
1d4ab907 SF	119	config CIFS_ACL
	120	bool "Provide CIFS ACL support"
	121	depends on CIFS_XATTR && KEYS
	122	help
	123	Allows fetching CIFS/NTFS ACL from the server. The DACL blob
	124	is handed over to the application/caller.
	125
471b1f98 JP	126	config CIFS_DEBUG
	127	bool "Enable CIFS debugging routines"
	128	default y
	129	depends on CIFS
	130	help
	131	Enabling this option adds helpful debugging messages to
	132	the cifs code which increases the size of the cifs module.
	133	If unsure, say Y.
bb26b963 AD	134	config CIFS_DEBUG2
bb26b963 AD	135	bool "Enable additional CIFS debugging routines"
471b1f98	136	depends on CIFS_DEBUG
bb26b963 AD	137	help
	138	Enabling this option adds a few more debugging routines
	139	to the cifs code which slightly increases the size of
	140	the cifs module and can cause additional logging of debug
	141	messages in some error paths, slowing performance. This
	142	option can be turned off unless you are debugging
	143	cifs problems. If unsure, say N.
	144
10e70afa SF	145	config CIFS_DFS_UPCALL
	146	bool "DFS feature support"
	147	depends on CIFS && KEYS
1a4240f4	148	select DNS_RESOLVER
10e70afa SF	149	help
	150	Distributed File System (DFS) support is used to access shares
	151	transparently in an enterprise name space, even if the share
	152	moves to a different server. This feature also enables
	153	an upcall mechanism for CIFS which contacts userspace helper
	154	utilities to provide server name resolution (host names to
	155	IP addresses) which is needed for implicit mounts of DFS junction
	156	points. If unsure, say N.
	157
25720873	158	config CIFS_NFSD_EXPORT
00f3616b KC	159	bool "Allow nfsd to export CIFS file system"
00f3616b KC	160	depends on CIFS && BROKEN
bb26b963	161	help
25720873	162	Allows NFS server to export a CIFS mounted share (nfsd over cifs)
675f36fb SF	163
675f36fb SF	164	config CIFS_SMB2
00f3616b KC	165	bool "SMB2 network file system support"
00f3616b KC	166	depends on CIFS && INET
675f36fb SF	167	select NLS
	168	select KEYS
	169	select FSCACHE
	170	select DNS_RESOLVER
	171
	172	help
	173	This enables experimental support for the SMB2 (Server Message Block
	174	version 2) protocol. The SMB2 protocol is the successor to the
	175	popular CIFS and SMB network file sharing protocols. SMB2 is the
	176	native file sharing mechanism for recent versions of Windows
	177	operating systems (since Vista). SMB2 enablement will eventually
	178	allow users better performance, security and features, than would be
	179	possible with cifs. Note that smb2 mount options also are simpler
	180	(compared to cifs) due to protocol improvements.
	181
	182	Unless you are a developer or tester, say N.
1d4ab907 SF	183
	184	config CIFS_FSCACHE
	185	bool "Provide CIFS client caching support"
	186	depends on CIFS=m && FSCACHE \|\| CIFS=y && FSCACHE=y
	187	help
	188	Makes CIFS FS-Cache capable. Say Y here if you want your CIFS data
	189	to be cached locally on disk through the general filesystem cache
	190	manager. If unsure, say N.
	191