fill_iface
fill_iface((ipfw_insn_if *)(*cmd), *av[0]);
fill_iface("xmit", &ifu, &byname, ac, *av);
fill_iface("recv", &ifu, &byname, ac, *av);
fill_iface("via", &ifu, &byname, ac, *av);
fill_iface((ipfw_insn_if *)cmd, av[0]);