gre_encap_dst
return (gre_encap_dst(tunnel, dst, m, proto, ttl, otos));
gre_encap_dst(const struct gre_tunnel *, const union gre_addr *,
gre_encap_dst((_t), &(_t)->t_dst, (_m), (_p), (_ttl), (_tos))
m = gre_encap_dst(tunnel, &gateway, m,