PF_UNSPEC
PF_LOCAL
PF_UNIX
PF_INET
PF_AX25
PF_IPX
PF_APPLETALK
PF_NETROM
PF_BRIDGE
PF_ATMPVC
PF_X25
PF_INET6
PF_ROSE
PF_DECnet
PF_NETBEUI
PF_SECURITY
PF_KEY
PF_NETLINK
PF_ROUTE
PF_PACKET
PF_ASH
PF_ECONET
PF_ATMSVC
PF_RDS
PF_SNA
PF_IRDA
PF_PPPOX
PF_WANPIPE
PF_LLC
PF_CAN
PF_TIPC
PF_BLUETOOTH
PF_IUCV
PF_RXRPC
PF_ISDN
PF_PHONET
PF_IEEE802154
PF_CAIF
PF_ALG
PF_NFC
PF_VSOCK