#!/bin/bash

# Wonder Shaper

function show_help {
  echo "Wonder Shaper 1.2.1"
  echo
  echo "Usage: $0 [device] clean|[upload speed in Kb/s] [download speed in Kb/s]"
  echo "Example: $0 eth0 20 500"
  echo
  echo "https://bugzilla.redhat.com/enter_bug.cgi?product=Fedora&component=wondershaper"
  exit
}

if [ $# -eq 0 ]; then
        show_help;
fi

if [ $# -eq 1 ]; then
  tc -s qdisc ls dev $1
  tc -s class ls dev $1
  exit
fi

if [ $# -eq 2 ]; then
  tc qdisc del dev $2 root    2> /dev/null > /dev/null
  tc qdisc del dev $2 ingress 2> /dev/null > /dev/null
  echo Wondershaper queues have been cleared.
  exit
fi

if [ $# -ne 3 ]; then
        show_help;
fi

# Set the following values to somewhat less than your actual download
# and uplink speed. In kilobits. Also set the device that is to be shaped.
DOWNLINK=$3
UPLINK=$2
DEV=$1

# low priority OUTGOING traffic - you can leave this blank if you want
# low priority source netmasks
NOPRIOHOSTSRC=

# low priority destination netmasks
NOPRIOHOSTDST=

# low priority source ports
NOPRIOPORTSRC=

# low priority destination ports
NOPRIOPORTDST=

#########################################################

# 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

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

###### uplink

# install root CBQ

tc qdisc add dev $DEV root handle 1: cbq avpkt 1000 bandwidth 1000mbit

# 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

# 'traffic we hate'

tc class add dev $DEV parent 1:1 classid 1:30 cbq rate $[8*$UPLINK/10]kbit \
   allot 1600 prio 2 avpkt 1000

# all 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
tc qdisc add dev $DEV parent 1:30 handle 30: 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

tc filter add dev $DEV parent 1:0 protocol ip prio 10 u32 \
   match ip protocol 17 0xff \
   match ip sport 4666 0xffff \
   flowid 1:30

# prioritize small packets (<64 bytes)

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 \
   flowid 1:10


# some traffic however suffers a worse fate
for a in $NOPRIOPORTDST
do
        tc filter add dev $DEV parent 1: protocol ip prio 14 u32 \
           match ip dport $a 0xffff flowid 1:30
done

for a in $NOPRIOPORTSRC
do
        tc filter add dev $DEV parent 1: protocol ip prio 15 u32 \
           match ip sport $a 0xffff flowid 1:30
done

for a in $NOPRIOHOSTSRC
do
        tc filter add dev $DEV parent 1: protocol ip prio 16 u32 \
           match ip src $a flowid 1:30
done

for a in $NOPRIOHOSTDST
do
        tc filter add dev $DEV parent 1: protocol ip prio 17 u32 \
           match ip dst $a flowid 1:30
done

# rest is 'non-interactive' ie 'bulk' and ends up in 1:20

tc filter add dev $DEV parent 1: protocol ip prio 18 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