| # SPDX-License-Identifier: GPL-2.0-only |
| config CIFS |
| tristate "SMB3 and CIFS support (advanced network filesystem)" |
| depends on INET |
| select NLS |
| select CRYPTO |
| select CRYPTO_MD5 |
| select CRYPTO_SHA256 |
| select CRYPTO_SHA512 |
| select CRYPTO_CMAC |
| select CRYPTO_HMAC |
| select CRYPTO_AEAD2 |
| select CRYPTO_CCM |
| select CRYPTO_GCM |
| select CRYPTO_ECB |
| select CRYPTO_AES |
| select KEYS |
| select DNS_RESOLVER |
| select ASN1 |
| select OID_REGISTRY |
| select NETFS_SUPPORT |
| help |
| This is the client VFS module for the SMB3 family of network file |
| protocols (including the most recent, most secure dialect SMB3.1.1). |
| This module also includes support for earlier dialects such as |
| SMB2.1, SMB2 and even the old Common Internet File System (CIFS) |
| protocol. CIFS was the successor to the original network filesystem |
| protocol, Server Message Block (SMB ie SMB1), the native file sharing |
| mechanism for most early PC operating systems. |
| |
| The SMB3.1.1 protocol is supported by most modern operating systems |
| and NAS appliances (e.g. Samba, Windows 11, Windows Server 2022, |
| MacOS) and even in the cloud (e.g. Microsoft Azure) and also by the |
| Linux kernel server, ksmbd. Support for the older CIFS protocol was |
| included in Windows NT4, 2000 and XP (and later). Use of dialects |
| older than SMB2.1 is often discouraged on public networks. |
| This module also provides limited support for OS/2 and Windows ME |
| and similar very old servers. |
| |
| This module provides an advanced network file system client for |
| mounting to SMB3 (and CIFS) compliant servers. It includes support |
| for DFS (hierarchical name space), secure per-user session |
| establishment via Kerberos or NTLMv2, RDMA (smbdirect), advanced |
| security features, per-share encryption, packet-signing, snapshots, |
| directory leases, safe distributed caching (leases), multichannel, |
| Unicode and other internationalization improvements. |
| |
| In general, the default dialects, SMB3 and later, enable better |
| performance, security and features, than would be possible with CIFS. |
| |
| If you need to mount to Samba, Azure, ksmbd, Macs or Windows from this |
| machine, say Y. |
| |
| config CIFS_STATS2 |
| bool "Extended statistics" |
| depends on CIFS |
| default y |
| 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 Documentation/admin-guide/cifs/usage.rst |
| for more details. These additional statistics may have a minor effect |
| on performance and memory utilization. |
| |
| If unsure, say Y. |
| |
| config CIFS_ALLOW_INSECURE_LEGACY |
| bool "Support legacy servers which use less secure dialects" |
| depends on CIFS |
| default y |
| help |
| Modern dialects, SMB2.1 and later (including SMB3 and 3.1.1), have |
| additional security features, including protection against |
| man-in-the-middle attacks and stronger crypto hashes, so the use |
| of legacy dialects (SMB1/CIFS and SMB2.0) is discouraged. |
| |
| Disabling this option prevents users from using vers=1.0 or vers=2.0 |
| on mounts with cifs.ko |
| |
| If unsure, say Y. |
| |
| config CIFS_UPCALL |
| bool "Kerberos/SPNEGO advanced session setup" |
| depends on CIFS |
| 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 Y. |
| |
| 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 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 Y. |
| |
| config CIFS_POSIX |
| bool "CIFS POSIX Extensions" |
| depends on CIFS && CIFS_ALLOW_INSECURE_LEGACY && CIFS_XATTR |
| help |
| Enabling this option will cause the cifs client to attempt to |
| negotiate a feature of the older cifs 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. This config |
| option is not needed when mounting with SMB3.1.1. If unsure, say N. |
| |
| 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_DEBUG_DUMP_KEYS |
| bool "Dump encryption keys for offline decryption (Unsafe)" |
| depends on CIFS_DEBUG |
| help |
| Enabling this will dump the encryption and decryption keys |
| used to communicate on an encrypted share connection on the |
| console. This allows Wireshark to decrypt and dissect |
| encrypted network captures. Enable this carefully. |
| If unsure, say N. |
| |
| config CIFS_DFS_UPCALL |
| bool "DFS feature support" |
| depends on CIFS |
| 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 in order to reconnect to |
| servers if their addresses change or for implicit mounts of |
| DFS junction points. If unsure, say Y. |
| |
| config CIFS_SWN_UPCALL |
| bool "SWN feature support" |
| depends on CIFS |
| help |
| The Service Witness Protocol (SWN) is used to get notifications |
| from a highly available server of resource state changes. This |
| feature enables an upcall mechanism for CIFS which contacts a |
| userspace daemon to establish the DCE/RPC connection to retrieve |
| the cluster available interfaces and resource change notifications. |
| If unsure, say Y. |
| |
| 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) |
| |
| if CIFS |
| |
| config CIFS_SMB_DIRECT |
| bool "SMB Direct support" |
| depends on CIFS=m && INFINIBAND && INFINIBAND_ADDR_TRANS || CIFS=y && INFINIBAND=y && INFINIBAND_ADDR_TRANS=y |
| help |
| Enables SMB Direct support for SMB 3.0, 3.02 and 3.1.1. |
| SMB Direct allows transferring SMB packets over RDMA. If unsure, |
| say Y. |
| |
| 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. |
| |
| config CIFS_ROOT |
| bool "SMB root file system (Experimental)" |
| depends on CIFS=y && IP_PNP |
| help |
| Enables root file system support over SMB protocol. |
| |
| Most people say N here. |
| |
| endif |
