gre_l2_tos
sc->sc_tunnel.t_ttl, gre_l2_tos(&sc->sc_tunnel, m));
static uint8_t gre_l2_tos(const struct gre_tunnel *, const struct mbuf *);
tunnel->t_ttl, gre_l2_tos(tunnel, m));
m = eoip_encap(sc, m, gre_l2_tos(&sc->sc_tunnel, m));
m = eoip_encap(sc, m, gre_l2_tos(&sc->sc_tunnel, m));
m = erspan_encap(sc, m, gre_l2_tos(&sc->sc_tunnel, m),