AF_UNSPEC 0,
AF_UNIX 1,
AF_INET 2,
AF_AX25 3,
AF_IPX 4,
AF_APPLETALK 5,
AF_NETROM 6,
AF_BRIDGE 7,
AF_ATMPVC 8,
AF_X25 9,
AF_INET6 10,
AF_ROSE 11,
AF_NETBEUI 13,
AF_SECURITY 14,
AF_KEY 15,
AF_NETLINK 16,
AF_PACKET 17,
AF_ASH 18,
AF_ECONET 19,
AF_ATMSVC 20,
AF_RDS 21,
AF_SNA 22,
AF_IRDA 23,
AF_PPPOX 24,
AF_WANPIPE 25,
AF_LLC 26,
AF_IB 27,
AF_MPLS 28,
AF_CAN 29,
AF_TIPC 30,
AF_BLUETOOTH 31,
AF_IUCV 32,
AF_RXRPC 33,
AF_ISDN 34,
AF_PHONET 35,
AF_IEEE802154 36,
AF_CAIF 37,
AF_ALG 38,
AF_NFC 39,
AF_VSOCK 40,
AF_KCM 41,
AF_QIPCRTR 42,
AF_SMC 43,
AF_XDP 44,
AF_MCTP 45,
AF_MAX 46,