recv_hello
void recv_hello(struct eigrp_iface *, union eigrpd_addr *, struct nbr *,
recv_hello(ei, src, nbr, tp);
void recv_hello(struct in_addr, struct ldp_msg *, int, union ldpd_addr *,
recv_hello(lsr_id, &msg, af, &src, iface, multicast, buf, len);
void recv_hello(struct iface *, struct in6_addr *, u_int32_t,
recv_hello(iface, &src.sin6_addr, ospf_hdr->rtr_id, buf, len);
void recv_hello(struct iface *, struct in_addr, u_int32_t,
recv_hello(iface, ip_hdr.ip_src, ospf_hdr->rtr_id, buf, len);