address_families(7) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | COLOPHON

ADDRESS_FAMILIES(7)     Linux Programmer's Manual    ADDRESS_FAMILIES(7)

NAME         top

       address_families - socket address families (domains)

SYNOPSIS         top

       #include <sys/types.h>          /* See NOTES */
       #include <sys/socket.h>

       int socket(int domain, int type, int protocol);

DESCRIPTION         top

       The domain argument of the socket(2) specifies a communication
       domain; this selects the protocol family which will be used for
       communication.  These families are defined in <sys/socket.h>.
       The formats currently understood by the Linux kernel include:

       AF_UNIX, AF_LOCAL
              Local communication For further information, see unix(7).

       AF_INET
              IPv4 Internet protocols.  For further information, see
              ip(7).

       AF_AX25
              Amateur radio AX.25 protocol.  For further information,
              see ax25(4).

       AF_IPX IPX - Novell protocols.

       AF_APPLETALK
              AppleTalk For further information, see ddp(7).

       AF_NETROM
              AX.25 packet layer protocol.  For further information, see
              netrom(4), The Packet Radio Protocols and Linuxhttps://www.tldp.org/HOWTO/AX25-HOWTO/x61.html⟩ and the
              AX.25, NET/ROM, and ROSE network programming chapters of
              the Linux Amateur Radio AX.25 HOWTOhttps://www.tldp.org/HOWTO/AX25-HOWTO/x2107.html⟩.

       AF_BRIDGE
              Can't be used for creating sockets; mostly used for bridge
              links in rtnetlink(7) protocol commands.

       AF_ATMPVC
              Access to raw ATM Permanent Virtual Circuits (PVCs).  For
              further information, see the ATM on Linux HOWTOhttps://www.tldp.org/HOWTO/text/ATM-Linux-HOWTO⟩.

       AF_X25 ITU-T X.25 / ISO-8208 protocol.  For further information,
              see x25(7).

       AF_INET6
              IPv6 Internet protocols.  For further information, see
              ipv6(7).

       AF_ROSE
              RATS (Radio Amateur Telecommunications Society) Open
              Systems environment (ROSE) AX.25 packet layer protocol.
              For further information, see the resources listed for
              AF_NETROM.

       AF_DECnet
              DECet protocol sockets.  See
              Documentation/networking/decnet.txt in the Linux kernel
              source tree for details.

       AF_NETBEUI
              Reserved for "802.2LLC project"; never used.

       AF_SECURITY
              This was a short-lived (between Linux 2.1.30 and
              2.1.99pre2) protocol family for firewall upcalls.

       AF_KEY Key management protocol, originally developed for usage
              with IPsec (since Linux 2.1.38).  This has no relation to
              keyctl(2) and the in-kernel key storage facility.  See RFC
              2367 PF_KEY Key Management API, Version 2https://tools.ietf.org/html/rfc2367⟩ for details.

       AF_NETLINK
              Kernel user interface device For further information, see
              netlink(7).

       AF_PACKET
              Low-level packet interface.  For further information, see
              packet(7).

       AF_ECONET
              Acorn Econet protocol (removed in Linux 3.5).  See the
              Econet documentation 
              ⟨http://www.8bs.com/othrdnld/manuals/econet.shtml⟩ for
              details.

       AF_ATMSVC
              Access to ATM Switched Virtual Circuits (SVCs) See the ATM
              on Linux HOWTOhttps://www.tldp.org/HOWTO/text/ATM-Linux-HOWTO⟩ for
              details.

       AF_RDS Reliable Datagram Sockets (RDS) protocol (since Linux
              2.6.30).  RDS over RDMA has no relation to AF_SMC or
              AF_XDP.  For further information see rds(7), rds-rdma(7),
              and Documentation/networking/rds.txt in the Linux kernel
              source tree.

       AF_IRDA
              Socket interface over IrDA (moved to staging in Linux
              4.14, removed in Linux 4.17).  For further information see
              irda(7).

       AF_PPPOX
              Generic PPP transport layer, for setting up L2 tunnels
              (L2TP and PPPoE).  See Documentation/networking/l2tp.txt
              in the Linux kernel source tree for details.

       AF_WANPIPE
              Legacy protocol for wide area network (WAN) connectivity
              that was used by Sangoma WAN cards (called "WANPIPE");
              removed in Linux 2.6.21.

       AF_LLC Logical link control (IEEE 802.2 LLC) protocol, upper part
              of data link layer of ISO/OSI networking protocol stack
              (since Linux 2.4); has no relation to AF_PACKET.  See
              chapter 13.5.3. Logical Link Control in Understanding
              Linux Kernel Internals (O'Reilly Media, 2006) and IEEE
              Standards for Local Area Networks: Logical Link Control
              (The Institute of Electronics and Electronics Engineers,
              Inc., New York, New York, 1985) for details.  See also
              some historical notes 
              ⟨https://wiki.linuxfoundation.org/networking/llc⟩ regarding
              its development.

       AF_IB  InfiniBand native addressing (since Linux 3.11).

       AF_MPLS
              Multiprotocol Label Switching (since Linux 4.1); mostly
              used for configuring MPLS routing via netlink(7), as it
              doesn't expose ability to create sockets to user space.

       AF_CAN Controller Area Network automotive bus protocol (since
              Linux 2.6.25).  See Documentation/networking/can.rst in
              the Linux kernel source tree for details.

       AF_TIPC
              TIPC, "cluster domain sockets" protocol (since Linux
              2.6.16).  See TIPC Programmer's Guidehttp://tipc.io/programming.html⟩ and the protocol
              description ⟨http://tipc.io/protocol.html⟩ for details.

       AF_BLUETOOTH
              Bluetooth low-level socket protocol (since Linux 3.11).
              See Bluetooth Management API overview 
              ⟨https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/doc/mgmt-
              api.txt⟩ and An Introduction to Bluetooth Programming by
              Albert Huang 
              ⟨https://people.csail.mit.edu/albert/bluez-intro/⟩ for
              details.

       AF_IUCV
              IUCV (inter-user communication vehicle) z/VM protocol for
              hypervisor-guest interaction (since Linux 2.6.21); has no
              relation to AF_VSOCK and/or AF_SMC See IUCV protocol
              overviewhttps://www.ibm.com/support/knowledgecenter/en/SSB27U_6.4.0/com.ibm.zvm.v640.hcpb4/iucv.htm⟩
              for details.

       AF_RXRPC
              Rx, Andrew File System remote procedure call protocol
              (since Linux 2.6.22).  See
              Documentation/networking/rxrpc.txt in the Linux kernel
              source tree for details.

       AF_ISDN
              New "modular ISDN" driver interface protocol (since Linux
              2.6.27).  See the mISDN wiki 
              ⟨http://www.misdn.eu/wiki/Main_Page/⟩ for details.

       AF_PHONET
              Nokia cellular modem IPC/RPC interface (since Linux
              2.6.31).  See Documentation/networking/phonet.txt in the
              Linux kernel source tree for details.

       AF_IEEE802154
              IEEE 802.15.4 WPAN (wireless personal area network) raw
              packet protocol (since Linux 2.6.31).  See
              Documentation/networking/ieee802154.txt in the Linux
              kernel source tree for details.

       AF_CAIF
              Ericsson's Communication CPU to Application CPU interface
              (CAIF) protocol (since Linux 2.6.36).  See
              Documentation/networking/caif/Linux-CAIF.txt in the Linux
              kernel source tree for details.

       AF_ALG Interface to kernel crypto API (since Linux 2.6.38).  See
              Documentation/crypto/userspace-if.rst in the Linux kernel
              source tree for details.

       AF_VSOCK
              VMWare VSockets protocol for hypervisor-guest interaction
              (since Linux 3.9); has no relation to AF_IUCV and AF_SMC.
              For further information, see vsock(7).

       AF_KCM KCM (kernel connection multiplexer) interface (since Linux
              4.6).  See Documentation/networking/kcm.txt in the Linux
              kernel source tree for details.

       AF_QIPCRTR
              Qualcomm IPC router interface protocol (since Linux 4.7).

       AF_SMC SMC-R (shared memory communications over RDMA) protocol
              (since Linux 4.11), and SMC-D (shared memory
              communications, direct memory access) protocol for intra-
              node z/VM quest interaction (since Linux 4.19); has no
              relation to AF_RDS, AF_IUCV or AF_VSOCK.  See RFC 7609
              IBM's Shared Memory Communications over RDMA (SMC-R)
              Protocolhttps://tools.ietf.org/html/rfc7609⟩ for details
              regarding SMC-R.  See SMC-D Reference Information 
              ⟨https://www-01.ibm.com/software/network/commserver/SMC-
              D/index.html⟩ for details regarding SMC-D.

       AF_XDP XDP (express data path) interface (since Linux 4.18).  See
              Documentation/networking/af_xdp.rst in the Linux kernel
              source tree for details.

SEE ALSO         top

       socket(2), socket(7)

COLOPHON         top

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Linux                          2018-10-16            ADDRESS_FAMILIES(7)

Pages that refer to this page: socket(2)socket(7)