sc_route
sc->sc_route.ro_rt = NULL;
error = ip_output(m, sc->sc_ipopts, &sc->sc_route,
sc->sc_route.ro_rt = NULL;
rt = isipv6 ? sc->sc_route6.ro_rt : sc->sc_route.ro_rt;
inp->inp_route = sc->sc_route;
sc->sc_route.ro_rt = NULL;