tc bandwidth shaping using port range

#!/bin/bash

TC=/sbin/tc
IF=wlan0
IP=10.0.0.2
DOWN=5mbit
UP=4kbps
U32="$TC filter add dev $IF protocol ip parent 1:0 prio 1 u32"


start() {

$TC qdisc add dev $IF root handle 1: htb default 30
$TC class add dev $IF parent 1: classid 1:1 htb rate $DOWN
$TC class add dev $IF parent 1: classid 1:2 htb rate $UP
$U32 match ip dst $IP/32 flowid 1:1
$U32 match ip src $IP/32 flowid 1:2
$U32 match ip protocol 17 0xff flowid 1:2

# Source Port Range
$U32 match ip sport 27960 0xfff8 flowid 1:2
$U32 match ip sport 27968 0xffe0 flowid 1:2
$U32 match ip sport 28000 0xffff flowid 1:2

# Destination Port Range
$U32 match ip dport 27960 0xfff8 flowid 1:2
$U32 match ip dport 27968 0xffe0 flowid 1:2
$U32 match ip dport 28000 0xffff flowid 1:2

}

stop() {

    $TC qdisc del dev $IF root

}

restart() {

    stop
    sleep 1
    start

}

show() {

    $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: shaper {start|stop|restart|show}"
    ;;

esac

exit 0