Qos & Tc

Afin de restreinte le trafic, nous allons utiliser l'utilitaire TC qui fonctionne avec iptables. Ceci est le script d'init à envoyer au démarrage.

#!/bin/bash
#
#  tc uses the following units when passed as a parameter.
#  kbps: Kilobytes per second
#  mbps: Megabytes per second
#  kbit: Kilobits per second
#  mbit: Megabits per second
#  bps: Bytes per second
#       Amounts of data can be specified in:
#       kb or k: Kilobytes
#       mb or m: Megabytes
#       mbit: Megabits
#       kbit: Kilobits
#  To get the byte figure from bits, divide the number by 8 bit
#
#
# Name of the traffic control command.
TC=/sbin/tc
# The network interface we're planning on limiting bandwidth.
IF=eth0             # Interface
# Download limit (in mega bits)
DNLD=400kbit          # DOWNLOAD Limit
#
IPT="/sbin/iptables"
start() {
   $IPT -t mangle -F
   $TC qdisc add dev $IF root handle 1:0 htb default 30
   $TC class add dev $IF parent 1:0 classid 1:10 htb rate $DNLD
   $IPT -A OUTPUT -t mangle -p tcp --sport 80 -j MARK --set-mark 10
   $TC filter add dev $IF parent 1:0 prio 0 protocol ip handle 10 fw
flowid 1:10
}

stop() {
# Stop the bandwidth shaping.
   $TC qdisc del dev $IF root
   $IPT --flush
}

restart() {
# Self-explanatory.
   stop
   sleep 1
   start
}

show() {
# 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"
   ;;
 show)
   echo "Bandwidth shaping status for $IF:"
   show
   echo ""
   ;;
 *)
   pwd=$(pwd)
   echo "Usage: tc.bash {start|stop|restart|show}"
   ;;
esac
exit 0