QNUM=200
IPT_FILTER_PRE="-p tcp --sport 80"
IPT_FILTER_POST="-p tcp --dport 80"

iptables -t raw -C PREROUTING $IPT_FILTER_PRE -j NFQUEUE --queue-num $QNUM --queue-bypass ||
 iptables -t raw -I PREROUTING $IPT_FILTER_PRE -j NFQUEUE --queue-num $QNUM --queue-bypass

iptables -t mangle -C POSTROUTING $IPT_FILTER_POST -j NFQUEUE --queue-num $QNUM --queue-bypass ||
 iptables -t mangle -I POSTROUTING $IPT_FILTER_POST -j NFQUEUE --queue-num $QNUM --queue-bypass