QoS Linux with HFSC

1. !/bin/sh
3. SipShaper v0.01
4. VoIP Traffic Shaper for 1024/128Kbit/s ADSL Line
6. Written by Udo Schacht-Wiegand (2005-04-03)
8. based on MYSHAPER from Dan Singletary (8/7/02)
9. http://www.nslu2-linux.org/wiki/HowTo/EnableTrafficShaping
10. and on phone-man's script
11. http://www.ip-phone-forum.de/forum/viewtopic.php?p=100371#100371
12. and on the (German) Linux Magazine 02/05 article p.28
14. Please mail comments and improvements to sipshaper at udo dot comlink dot org

1. Set your outgoing interface and upload rate (in kbit/s) here

DEV=ppp0
RATEUP=128

RTPS=$(cat /etc/asterisk/rtp.conf|awk -F= '/rtpstart/ {print $2}')
RTPE=$(cat /etc/asterisk/rtp.conf|awk -F= '/rtpend/ {print $2}')

1. Which ports should be prioritized (yes, I know that ssh is not VoIP ;-)

VOIPPORTS="sip iax $RTPS:$RTPE ssh"

1. Which servers should be prioritized (may be empty "")

VOIPIPS="192.168.178.1 192.168.178.99"

1. end of configuration options

1. show status and exit

if [ "$1" = "status" ]
then
echo "[qdisc]"
tc -s qdisc show dev $DEV

echo ""
echo "[class]"
tc -s class show dev $DEV

echo ""
echo "[filter]"
tc -s filter show dev $DEV

echo ""
echo "[iptables]"
iptables -t mangle -L SIPSHAPER -v -x 2> /dev/null
exit
fi

1. default: start it #

1. Reset everything to a known state (cleared)

tc qdisc del dev $DEV root 2> /dev/null > /dev/null

1. Flush and delete tables

iptables -t mangle --delete POSTROUTING -o $DEV -j SIPSHAPER 2> /dev/null > /dev/null
iptables -t mangle --flush SIPSHAPER 2> /dev/null > /dev/null
iptables -t mangle --delete-chain SIPSHAPER 2> /dev/null > /dev/null

1. stop it and exit

if [ "$1" = "stop" ]
then
echo "Shaping removed on $DEV."
exit
fi

1. set up shaping

1. add HFSC root qdisc

tc qdisc add dev $DEV root handle 1: hfsc default 10

1. add main rate limit class

tc class add dev $DEV parent 1: classid 1:1 hfsc sc rate ${RATEUP}kbit ul rate ${RATEUP}kbit

1. keep it simple: two classes only

tc class add dev $DEV parent 1:1 classid 1:10 hfsc sc umax 1500b dmax 53ms rate 40kbit ul rate ${RATEUP}kbit
tc class add dev $DEV parent 1:1 classid 1:11 hfsc sc umax 1500b dmax 30ms rate 80kbit ul rate ${RATEUP}kbit

1. add SIPSHAPER chain to the mangle table in iptables

iptables -t mangle --new-chain SIPSHAPER
iptables -t mangle --insert POSTROUTING -o $DEV -j SIPSHAPER

1. Filter for voip packets

tc filter add dev $DEV parent 1: prio 1 protocol ip handle 1 fw flowid 1:11

1. VoIP ports as defined above

for port in $VOIPPORTS
do
iptables -t mangle -A SIPSHAPER -p udp --sport $port -j MARK --set-mark 1
iptables -t mangle -A SIPSHAPER -p udp --dport $port -j MARK --set-mark 1
done

1. VoIP IPs as defined above

for ip in $VOIPIPS
do
iptables -t mangle -A SIPSHAPER -p udp --src $ip -j MARK --set-mark 1
iptables -t mangle -A SIPSHAPER -p udp --dst $ip -j MARK --set-mark 1
done



echo SipShaper started on $DEV with ${RATEUP}kbit/s upload rate.

echo -n "QoS activated for ports: "
for port in $VOIPPORTS
do
echo -n " $port"
done
echo "."

echo -n "QoS activated for ip# : "
for ip in $VOIPIPS
do
echo -n " $ip"
done
echo "."

1. end