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1config 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
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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
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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
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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
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25 The module also provides optional support for the followon
26 protocols for CIFS including SMB3, which enables
27 useful performance and security features (see the description
28 of CONFIG_CIFS_SMB2).
29
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30 The cifs module provides an advanced network file system
31 client for mounting to CIFS compliant servers. It includes
32 support for DFS (hierarchical name space), secure per-user
33 session establishment via Kerberos or NTLM or NTLMv2,
34 safe distributed caching (oplock), optional packet
35 signing, Unicode and other internationalization improvements.
36 If you need to mount to Samba or Windows from this machine, say Y.
37
38config CIFS_STATS
39 bool "CIFS statistics"
40 depends on CIFS
41 help
42 Enabling this option will cause statistics for each server share
43 mounted by the cifs client to be displayed in /proc/fs/cifs/Stats
44
45config CIFS_STATS2
46 bool "Extended statistics"
47 depends on CIFS_STATS
48 help
49 Enabling this option will allow more detailed statistics on SMB
50 request timing to be displayed in /proc/fs/cifs/DebugData and also
51 allow optional logging of slow responses to dmesg (depending on the
52 value of /proc/fs/cifs/cifsFYI, see fs/cifs/README for more details).
53 These additional statistics may have a minor effect on performance
54 and memory utilization.
55
56 Unless you are a developer or are doing network performance analysis
57 or tuning, say N.
58
59config CIFS_WEAK_PW_HASH
60 bool "Support legacy servers which use weaker LANMAN security"
61 depends on CIFS
62 help
63 Modern CIFS servers including Samba and most Windows versions
64 (since 1997) support stronger NTLM (and even NTLMv2 and Kerberos)
65 security mechanisms. These hash the password more securely
66 than the mechanisms used in the older LANMAN version of the
67 SMB protocol but LANMAN based authentication is needed to
68 establish sessions with some old SMB servers.
69
70 Enabling this option allows the cifs module to mount to older
71 LANMAN based servers such as OS/2 and Windows 95, but such
72 mounts may be less secure than mounts using NTLM or more recent
73 security mechanisms if you are on a public network. Unless you
74 have a need to access old SMB servers (and are on a private
75 network) you probably want to say N. Even if this support
76 is enabled in the kernel build, LANMAN authentication will not be
77 used automatically. At runtime LANMAN mounts are disabled but
78 can be set to required (or optional) either in
79 /proc/fs/cifs (see fs/cifs/README for more detail) or via an
80 option on the mount command. This support is disabled by
81 default in order to reduce the possibility of a downgrade
82 attack.
83
84 If unsure, say N.
85
86config CIFS_UPCALL
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87 bool "Kerberos/SPNEGO advanced session setup"
88 depends on CIFS && KEYS
89 select DNS_RESOLVER
90 help
91 Enables an upcall mechanism for CIFS which accesses userspace helper
92 utilities to provide SPNEGO packaged (RFC 4178) Kerberos tickets
93 which are needed to mount to certain secure servers (for which more
94 secure Kerberos authentication is required). If unsure, say N.
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95
96config CIFS_XATTR
97 bool "CIFS extended attributes"
98 depends on CIFS
99 help
100 Extended attributes are name:value pairs associated with inodes by
101 the kernel or by users (see the attr(5) manual page, or visit
102 <http://acl.bestbits.at/> for details). CIFS maps the name of
103 extended attributes beginning with the user namespace prefix
104 to SMB/CIFS EAs. EAs are stored on Windows servers without the
105 user namespace prefix, but their names are seen by Linux cifs clients
106 prefaced by the user namespace prefix. The system namespace
107 (used by some filesystems to store ACLs) is not supported at
108 this time.
109
110 If unsure, say N.
111
112config CIFS_POSIX
113 bool "CIFS POSIX Extensions"
114 depends on CIFS_XATTR
115 help
116 Enabling this option will cause the cifs client to attempt to
117 negotiate a newer dialect with servers, such as Samba 3.0.5
118 or later, that optionally can handle more POSIX like (rather
119 than Windows like) file behavior. It also enables
120 support for POSIX ACLs (getfacl and setfacl) to servers
121 (such as Samba 3.10 and later) which can negotiate
122 CIFS POSIX ACL support. If unsure, say N.
123
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124config CIFS_ACL
125 bool "Provide CIFS ACL support"
126 depends on CIFS_XATTR && KEYS
127 help
128 Allows fetching CIFS/NTFS ACL from the server. The DACL blob
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129 is handed over to the application/caller. See the man
130 page for getcifsacl for more information.
1d4ab907 131
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132config CIFS_DEBUG
133 bool "Enable CIFS debugging routines"
134 default y
135 depends on CIFS
136 help
137 Enabling this option adds helpful debugging messages to
138 the cifs code which increases the size of the cifs module.
139 If unsure, say Y.
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140config CIFS_DEBUG2
141 bool "Enable additional CIFS debugging routines"
471b1f98 142 depends on CIFS_DEBUG
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143 help
144 Enabling this option adds a few more debugging routines
145 to the cifs code which slightly increases the size of
146 the cifs module and can cause additional logging of debug
147 messages in some error paths, slowing performance. This
148 option can be turned off unless you are debugging
149 cifs problems. If unsure, say N.
150
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151config CIFS_DFS_UPCALL
152 bool "DFS feature support"
153 depends on CIFS && KEYS
1a4240f4 154 select DNS_RESOLVER
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155 help
156 Distributed File System (DFS) support is used to access shares
157 transparently in an enterprise name space, even if the share
158 moves to a different server. This feature also enables
159 an upcall mechanism for CIFS which contacts userspace helper
160 utilities to provide server name resolution (host names to
161 IP addresses) which is needed for implicit mounts of DFS junction
162 points. If unsure, say N.
163
25720873 164config CIFS_NFSD_EXPORT
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165 bool "Allow nfsd to export CIFS file system"
166 depends on CIFS && BROKEN
bb26b963 167 help
25720873 168 Allows NFS server to export a CIFS mounted share (nfsd over cifs)
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169
170config CIFS_SMB2
ca5d13fc 171 bool "SMB2 and SMB3 network file system support"
00f3616b 172 depends on CIFS && INET
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173 select NLS
174 select KEYS
175 select FSCACHE
176 select DNS_RESOLVER
177
178 help
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179 This enables support for the Server Message Block version 2
180 family of protocols, including SMB3. SMB3 support is
181 enabled on mount by specifying "vers=3.0" in the mount
182 options. These protocols are the successors to the popular
183 CIFS and SMB network file sharing protocols. SMB3 is the
184 native file sharing mechanism for the more recent
185 versions of Windows (Windows 8 and Windows 2012 and
186 later) and Samba server and many others support SMB3 well.
187 In general SMB3 enables better performance, security
188 and features, than would be possible with CIFS (Note that
189 when mounting to Samba, due to the CIFS POSIX extensions,
190 CIFS mounts can provide slightly better POSIX compatibility
191 than SMB3 mounts do though). Note that SMB2/SMB3 mount
192 options are also slightly simpler (compared to CIFS) due
193 to protocol improvements.
1d4ab907 194
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195config CIFS_SMB311
196 bool "SMB3.1.1 network file system support (Experimental)"
197 depends on CIFS_SMB2 && INET
198
199 help
200 This enables experimental support for the newest, SMB3.1.1, dialect.
201 This dialect includes improved security negotiation features.
202 If unsure, say N
203
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204config CIFS_FSCACHE
205 bool "Provide CIFS client caching support"
206 depends on CIFS=m && FSCACHE || CIFS=y && FSCACHE=y
207 help
208 Makes CIFS FS-Cache capable. Say Y here if you want your CIFS data
209 to be cached locally on disk through the general filesystem cache
210 manager. If unsure, say N.
211