Ubuntu Manpage: address_families - socket address families (domains)

NAME

       address_families - socket address families (domains)

SYNOPSIS

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

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

DESCRIPTION

       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 Linux and the AX.25, NET/ROM, and ROSE network programming chapters of the Linux Amateur Radio
              AX.25 HOWTO.

       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 HOWTO.

       AF_X25 ITU-T X.25 / ISO/IEC 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 2 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 for details.

       AF_ATMSVC
              Access to ATM Switched Virtual Circuits (SVCs) See the ATM on 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 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 Guide and the
              protocol description for details.

       AF_BLUETOOTH
              Bluetooth low-level socket protocol (since Linux 3.11).  See Bluetooth Management API overview and
              An Introduction to Bluetooth Programming by Albert Huang 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 overview 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 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) Protocol  for  details  regarding  SMC-R.   See   SMC-D Reference
              Information 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.

NAME

SYNOPSIS

DESCRIPTION

SEE ALSO