#!/bin/bash
#
# tc1.sh
#
# The Ultimate Setup For Your Internet Connection At Home
# 
# http://forums.edonkey2000.com/phpBB/viewtopic.php?topic=26596&forum=11&13
#
# Set the following values to somewhat less than your actual download
# and uplink speed. In kilobits/s
# DSL-Modem is ppp0, 1 Mbit/s dwonlink, 200 kbit/s upload

# make sure the skript is started without a parameter
if [ $# -ne 0 ]; then
  exit 0
fi

DOWNLINK=1599
UPLINK=249
DEV=dsl0

# clean existing down- and uplink qdiscs, hide errors
tc qdisc del dev $DEV root 2> /dev/null > /dev/null
tc qdisc del dev $DEV ingress 2> /dev/null > /dev/null

###### uplink

# install root CBQ
tc qdisc add dev $DEV root handle 1: cbq avpkt 1000 bandwidth ${DOWNLINK}kbit

# shape everything at $UPLINK speed - this prevents huge queues in your
# DSL modem which destroy latency:
# main class
tc class add dev $DEV parent 1: classid 1:1 cbq rate ${UPLINK}kbit allot 1500 prio 5 bounded isolated

# high prio class 1:10:
tc class add dev $DEV parent 1:1 classid 1:10 cbq rate ${UPLINK}kbit allot 1600 prio 1 avpkt 1000

# bulk and default class 1:20 - gets slightly less traffic,
# and a lower priority:
tc class add dev $DEV parent 1:1 classid 1:20 cbq rate $[9*$UPLINK/10]kbit allot 1600 prio 2 avpkt 1000

# both get Stochastic Fairness:
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

# start filters
# TOS Minimum Delay (ssh, NOT scp) in 1:10:
tc filter add dev $DEV parent 1:0 protocol ip prio 10 u32 match ip tos 0x10 0xff flowid 1:10

# ICMP (ip protocol 1) in the interactive class 1:10 so we
# can do measurements & impress our friends:
tc filter add dev $DEV parent 1:0 protocol ip prio 11 u32 match ip protocol 1 0xff flowid 1:10

# To speed up downloads while an upload is going on, put ACK packets in
# the interactive class:
tc filter add dev $DEV parent 1: protocol ip prio 12 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

# rest is 'non-interactive' ie 'bulk' and ends up in 1:20
tc filter add dev $DEV parent 1: protocol ip prio 13 u32 match ip dst 0.0.0.0/0 flowid 1:20

########## downlink #############
# slow downloads down to somewhat less than the real speed to prevent
# queuing at our ISP. Tune to see how high you can set it.
# ISPs tend to have *huge* queues to make sure big downloads are fast
#
# attach ingress policer:
tc qdisc add dev $DEV handle ffff: ingress

# filter *everything* to it (0.0.0.0/0), drop everything that's
# coming in too fast:
tc filter add dev $DEV parent ffff: protocol ip prio 50 u32 match ip src 0.0.0.0/0 police rate ${DOWNLINK}kbit burst 10k drop flowid :1