#!/bin/bash
IF="eth0"
TC=/sbin/tc
IPTABLES=/sbin/iptables
REM="-D"
ADD="-A"



start() {

$TC qdisc add dev eth0 root handle 1:0 htb default 10
$TC class add dev eth0 parent 1:0 classid 1:10 htb rate 20kbps ceil 20kbps prio 0
$IPTABLES $ADD OUTPUT -t mangle -p tcp --sport 80 -j MARK --set-mark 10
$TC filter add dev eth0 parent 1:0 prio 0 protocol ip handle 10 fw flowid 1:10

}
stop() {

# Stop the bandwidth shaping.
    $TC qdisc del dev $IF root
     $IPTABLES $REM OUTPUT -t mangle -p tcp --sport 80 -j MARK --set-mark 10

}

restart() {

# Self-explanatory.
    stop
    sleep 1
    start

}

status() {

# Display status of traffic control status.
    $TC -s qdisc ls dev $IF

}

case "$1" in

  start)

    echo -n "Starting bandwidth shaping: "
    start
    echo "done"
    ;;

  stop)

    echo -n "Stopping bandwidth shaping: "
    stop

    echo "done"
    ;;

  restart)

    echo -n "Restarting bandwidth shaping: "
    restart
    echo "done"
    ;;

  status)

    echo "Bandwidth shaping status for $IF:"
    status
    echo ""
    ;;

  *)

    pwd=$(pwd)
    echo "Usage: tc.bash {start|stop|restart|status}"
    ;;

esac

exit 0