if_ubaget
m = if_ubaget(&sc->sc_ifuba, &sc->sc_ifr[sc->sc_rindex],
m = if_ubaget(&sc->sc_ifuba, ifrw, ifp, len);
m = if_ubaget(&sc->sc_ifuba, &sc->sc_ifr[(int)sc->rindex],
if_ubaget(&(ifu)->ifu_info, &(ifu)->ifu_r, ifp, len)
struct mbuf *if_ubaget(struct ifubinfo *, struct ifrw *, struct ifnet *, int);