lookup_nat_name
ptr = lookup_nat_name(&chain->nat, ucfg->name);
tcfg = lookup_nat_name(&chain->nat, ucfg->name);
ptr = lookup_nat_name(&chain->nat, ntlv->name);
ptr = lookup_nat_name(&chain->nat, ucfg->name);
ptr = lookup_nat_name(&chain->nat, ucfg->name);