fs/cifs/Kconfig

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