#!/bin/bash

RATEUP=500
DEV=eth1

if [ "$1" = "status" ]
then
        echo ""
        echo "====="
        tc -s qdisc ls dev $DEV
        echo ""
        tc -s class ls dev $DEV
        echo "====="
        exit
fi

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

if [ "$1" = "stop" ]
then
        exit
fi

#the qdisc
tc qdisc add dev $DEV root handle 1: hfsc default 20

#root class and leaf classes
tc class add dev $DEV parent 1: classid 1:1 hfsc \
        sc rate ${RATEUP}kbit \
        ul rate ${RATEUP}kbit

#bulk traffic
tc class add dev $DEV parent 1:1 classid 1:20 hfsc \
        sc umax 1500b dmax 15ms rate $[5*$RATEUP/100]kbit \
        ul rate ${RATEUP}kbit

#low-latency class
tc class add dev $DEV parent 1:1 classid 1:10 hfsc \
        sc umax 1500b dmax 15ms rate $[95*$RATEUP/100]kbit \
        ul rate ${RATEUP}kbit

#sochastic fair queueing
tc qdisc add dev $DEV parent 1:10 handle 10: sfq perturb 10
tc qdisc add dev $DEV parent 1:20 handle 20: sfq perturb 10

#TOS & ICMP
tc filter add dev $DEV parent 1:0 protocol ip prio 1 u32 match ip tos 0x10 0xff flowid 1:10
tc filter add dev $DEV parent 1:0 protocol ip prio 1 u32 match ip protocol 1 0xff flowid 1:10

#ACKS
tc filter add dev $DEV parent 1: protocol ip prio 1 u32 \
   match ip protocol 6 0xff \
   match u8 0x05 0x0f at 0 \
   match u16 0x0000 0xffc0 at 2 \
   match u8 0x10 0xff at 33 \
   flowid 1:10