ipfw_ref_table
int ipfw_ref_table(struct ip_fw_chain *ch, ipfw_obj_ntlv *ntlv, uint32_t *kidx);
if (ipfw_ref_table(ch, &i->ntlv4, &cfg->map46) != 0)
if (ipfw_ref_table(ch, &i->ntlv6, &cfg->map64) != 0)