$IPTABLES -N zone_$1_DROP
$IPTABLES -N zone_$1_REJECT
$IPTABLES -N zone_$1_forward
- $IPTABLES -A zone_$1_forward -j zone_$1_$5
- $IPTABLES -A zone_$1 -j zone_$1_$3
- $IPTABLES -A output -j zone_$1_$4
+ [ "$5" ] && $IPTABLES -A zone_$1_forward -j zone_$1_$5
+ [ "$3" ] && $IPTABLES -A zone_$1 -j zone_$1_$3
+ [ "$4" ] && $IPTABLES -A output -j zone_$1_$4
$IPTABLES -N zone_$1_nat -t nat
$IPTABLES -N zone_$1_prerouting -t nat
$IPTABLES -t raw -N zone_$1_notrack