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ADDRESS_FAMILIES(7)        Linux Programmer's ManualADDRESS_FAMILIES(7)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 thesocket(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, seeunix(7).       AF_INET              IPv4 Internet protocols.  For further information, seeip(7).       AF_AX25              Amateur radio AX.25  protocol.   For  further  information,  seeax25(4).       AF_IPX IPX - Novell protocols.       AF_APPLETALK              AppleTalk For further information, seeddp(7).       AF_NETROM              AX.25  packet  layer  protocol.   For  further  information, seenetrom(4),   The    Packet    Radio    Protocols    and    Linux              <https://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              HOWTO              <https://www.tldp.org/HOWTO/AX25-HOWTO/x2107.html>.       AF_BRIDGE              Can't be used for creating sockets; mostly used for bridge links              inrtnetlink(7) protocol commands.       AF_ATMPVC              Access  to  raw ATM Permanent Virtual Circuits (PVCs).  For fur-              ther   information,    see    the    ATM    on    Linux    HOWTO              <https://www.tldp.org/HOWTO/text/ATM-Linux-HOWTO>.       AF_X25 ITU-T  X.25  /  ISO-8208 protocol.  For further information, seex25(7).       AF_INET6              IPv6 Internet protocols.  For further information, seeipv6(7).       AF_ROSE              RATS (Radio Amateur Telecommunications Society) Open Systems en-              vironment  (ROSE)  AX.25 packet layer protocol.  For further in-              formation, 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 tokeyctl(2)              and the in-kernel key storage facility.  See RFC 2367 PF_KEY Key              Management  API, Version 2 <https://tools.ietf.org/html/rfc2367>              for details.       AF_NETLINK              Kernel  user  interface  device  For  further  information,  seenetlink(7).       AF_PACKET              Low-level   packet  interface.   For  further  information,  seepacket(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   HOWTO  <https://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 seerds(7),rds-rdma(7), and  Documentation/network-              ing/rds.txt in the Linux kernel source tree.       AF_IRDA              Socket  interface over IrDA (moved to staging in Linux 4.14, re-              moved in Linux 4.17).  For further information seeirda(7).       AF_PPPOX              Generic PPP transport layer, for setting up L2 tunnels (L2TP and              PPPoE).  See Documentation/networking/l2tp.txt in the Linux ker-              nel 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  Net-              works:  Logical  Link  Control (The Institute of Electronics and              Electronics Engineers, Inc., New York, New York, 1985)  for  de-              tails.        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 vianetlink(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 ker-              nel source tree for details.       AF_TIPC              TIPC,  "cluster  domain  sockets" protocol (since Linux 2.6.16).              See TIPC  Programmer's  Guide  <http://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 hyper-              visor-guest interaction (since Linux 2.6.21); has no relation to              AF_VSOCK   and/or   AF_SMC   See    IUCV    protocol    overview              <https://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/network-              ing/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/network-              ing/caif/Linux-CAIF.txt in the Linux kernel source tree for  de-              tails.       AF_ALG Interface  to kernel crypto API (since Linux 2.6.38).  See Docu-              mentation/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, seevsock(7).       AF_KCM KCM (kernel connection multiplexor) 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 <https://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 Docu-              mentation/networking/af_xdp.rst in the Linux kernel source  tree              for details.SEE ALSOsocket(2),socket(7)COLOPHON       This  page  is  part of release 5.05 of the Linux man-pages project.  A       description of the project, information about reporting bugs,  and  the       latest     version     of     this    page,    can    be    found    at       https://www.kernel.org/doc/man-pages/.Linux                             2018-10-16ADDRESS_FAMILIES(7)