ipf_nat_add_tq
ipn->in_tqehead[0] = ipf_nat_add_tq(softc, ttl);
ipn->in_tqehead[1] = ipf_nat_add_tq(softc, ttl);
softi->ipsec_state_tqe = ipf_nat_add_tq(softc, softi->ipsec_proxy_ttl);
extern ipftq_t *ipf_nat_add_tq(ipf_main_softc_t *, int);