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        select CRYPTO_CMAC
  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
  19          file servers such as Windows 2000 (including Windows 2003, Windows 2008,
  20          NT 4 and Windows XP) as well by Samba (which provides excellent CIFS
  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.
  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.
  33config 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
  40config 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.
  51          Unless you are a developer or are doing network performance analysis
  52          or tuning, say N.
  54config 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.
  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.
  79          If unsure, say N.
  81config CIFS_UPCALL
  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.
  91config 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          <> 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.
 105          If unsure, say N.
 107config 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.
 119config 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.
 126config 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.
 134config CIFS_DEBUG2
 135        bool "Enable additional CIFS debugging routines"
 136        depends on CIFS_DEBUG
 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.
 145config CIFS_DFS_UPCALL
 146          bool "DFS feature support"
 147          depends on CIFS && KEYS
 148          select DNS_RESOLVER
 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.
 159          bool "Allow nfsd to export CIFS file system"
 160          depends on CIFS && BROKEN
 161          help
 162           Allows NFS server to export a CIFS mounted share (nfsd over cifs)
 164config CIFS_SMB2
 165        bool "SMB2 network file system support"
 166        depends on CIFS && INET
 167        select NLS
 168        select KEYS
 169        select FSCACHE
 170        select DNS_RESOLVER
 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.
 182          Unless you are a developer or tester, say N.
 184config 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.
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