MPLS_LABEL_IPV6NULL
case MPLS_LABEL_IPV6NULL:
kn->r.local_label = MPLS_LABEL_IPV6NULL;
if (label == MPLS_LABEL_IPV6NULL) {
*label != MPLS_LABEL_IPV6NULL &&
MPLS_LABEL_IPV6NULL);
return (MPLS_LABEL_IPV6NULL);
case MPLS_LABEL_IPV6NULL: