ipf_nat_insert
if (ipf_nat_insert(softc, softn, nat) == 0) {
if (ipf_nat_insert(softc, softn, clone) == -1) {
extern int ipf_nat_insert(ipf_main_softc_t *, ipf_nat_softc_t *,
(void) ipf_nat_insert(softc, softc->ipf_nat_soft, n);