1config 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.
  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.
  32config 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
  39config 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.
  50          Unless you are a developer or are doing network performance analysis
  51          or tuning, say N.
  53config 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.
  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.
  78          If unsure, say N.
  80config 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.
  90config 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          <> 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.
 104          If unsure, say N.
 106config 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.
 118config 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.
 125config 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.
 136config 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.
 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)
 155config 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
 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.
 173          Unless you are a developer or tester, say N.
 175config 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.
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