if_lookupbyvif
if ((ifp = if_lookupbyvif(mfccp->mfcc_parent, rtableid)) == NULL) {
ifp = if_lookupbyvif(vidx, rtableid);
struct ifnet *if_lookupbyvif(vifi_t, unsigned int);
if ((ifp = if_lookupbyvif(vifi, rtableid)) == NULL)
if (if_lookupbyvif(vifcp->vifc_vifi, rtableid) != NULL)
if ((ifp = if_lookupbyvif(*vifip, rtableid)) == NULL)
if ((ifp = if_lookupbyvif(i, rtableid)) == NULL)