taglinefilesource code
sa_family5include/linux/socket.hunsigned short sa_family;  /* address family, AF_xxx */
sa_family582net/tcp/arp.cif (req->arp_pa.sa_family != AF_INET) return -1;
sa_family584net/tcp/arp.cif (req->arp_ha.sa_family != AF_UNSPEC) return -1;
sa_family290net/tcp/packet.caddr.sa_family = skb->dev->type;