npf_napt_rwr
if (npf_napt_rwr(&enpc, which, addr, port)) {
int npf_napt_rwr(const npf_cache_t *, u_int, const npf_addr_t *,
return npf_napt_rwr(npc, which, addr, port);
return npf_napt_rwr(npc, which, taddr, np->n_tport);