sctp_fanout
connp = sctp_fanout(&ip6h->ip6_src, &ip6h->ip6_dst, ports,
connp = sctp_fanout(&map_src, &map_dst, ports, ira, mp,
connp = sctp_fanout(src, dst, ports, ira, mp, sctps, NULL);
extern conn_t *sctp_fanout(in6_addr_t *, in6_addr_t *, uint32_t,