VIFF_REGISTER
if (viftable[xmt_vif].v_flags & VIFF_REGISTER)
if (viftable[vifi].v_flags & VIFF_REGISTER)
!(viftable[vifi].v_flags & (VIFF_TUNNEL | VIFF_REGISTER))) {
if (vifcp->vifc_flags & VIFF_REGISTER) {
} else if (vifcp->vifc_flags & VIFF_REGISTER) {
if (!(vifp->v_flags & (VIFF_TUNNEL | VIFF_REGISTER)))
if (vifp->v_flags & VIFF_REGISTER)