#! /bin/sh -x
#
# sample script on using the ingress capabilities using u32 classifier
# This script tags tcindex based on metering on the ingress 
# interface the result is used for fast classification and re-marking
# on the egress interface
# This is an example of a color aware mode marker with PIR configured
# based on draft-wahjak-mcm-00.txt (section 3.1)
#
# The colors are defined using the Diffserv Fields
#path to various utilities;
#change to reflect yours.
#
IPROUTE=/usr/src/iproute2-current
TC=$IPROUTE/tc/tc
IP=$IPROUTE/ip/ip
INDEV=eth0
EGDEV="dev eth1"
CIR1=1500kbit
CIR2=1000kbit

#The CBS is about 60 MTU sized packets
CBS1=90k
CBS2=90k

############################################################ 
#
# install the ingress qdisc on the ingress interface
$TC qdisc add dev $INDEV handle ffff: ingress
############################################################ 
#
# Create u32 filters 
$TC filter add dev $INDEV parent ffff: protocol ip prio 4 handle 1: u32 \
divisor 1
############################################################ 

# The meters: Note that we have shared meters in this case as identified
# by the index parameter
meter1=" police index 1 rate $CIR1 burst $CBS1 "
meter2=" police index 2 rate $CIR2 burst $CBS1 "
meter3=" police index 3 rate $CIR2 burst $CBS2 "
meter4=" police index 4 rate $CIR1 burst $CBS2 "
meter5=" police index 5 rate $CIR1 burst $CBS2 "

# All packets are marked with a tcindex value which is used on the egress
# tcindex 1 maps to AF41, 2->AF42, 3->AF43, 4->BE

# *********************** AF41 *************************** 
#AF41 (DSCP 0x22) is passed on with a tcindex value 1
#if it doesn't exceed its CIR/CBS 
#policer 1  is used.
#
$TC filter add dev $INDEV parent ffff: protocol ip prio 4 u32 \
match ip tos 0x88 0xfc \
$meter1 \
continue flowid :1
#
# if it exceeds the above but not the extra rate/burst below, it gets a 
# tcindex value  of 2
# policer 2 is used
#
$TC filter add dev $INDEV parent ffff: protocol ip prio 5 u32 \
match ip tos 0x88 0xfc \
$meter2 \
continue flowid :2
#
# if it exceeds the above but not the rule below, it gets a tcindex value
# of 3 (policer 3)
#
$TC filter add dev $INDEV parent ffff: protocol ip prio 6 u32 \
match ip tos 0x88 0xfc \
$meter3 \
drop flowid :3
#

# *********************** AF42 *************************** 
#AF42 (DSCP 0x24) from is passed on with a tcindex value 2
#if it doesn't exceed its CIR/CBS 
#policer 2 is used. Note that this is shared with the AF41
#
#
$TC filter add dev $INDEV parent ffff: protocol ip prio 5 u32 \
match ip tos 0x90 0xfc \
$meter2 \
continue flowid :2
#
# if it exceeds the above but not the rule below, it gets a tcindex value
# of 3 (policer 3)
#
$TC filter add dev $INDEV parent ffff: protocol ip prio 6 u32 \
match ip tos 0x90 0xfc \
$meter3 \
drop flowid :3
#
# *********************** AF43 *************************** 
#
#AF43 (DSCP 0x26) from is passed on with a tcindex value 3
#if it doesn't exceed its CIR/CBS
#policer 3 is used. Note that this is shared with the AF41 and AF42
#
$TC filter add dev $INDEV parent ffff: protocol ip prio 6 u32 \
match ip tos 0x98 0xfc \
$meter3 \
drop flowid :3
#
# *********************** BE *************************** 
#
# Anything else (not from the AF4*) gets discarded if it 
# exceeds 1Mbps and by default goes to BE if it doesn't
# Note that the BE class is also used by the AF4* in the worst
# case
#
$TC filter add dev $INDEV parent ffff: protocol ip prio 7 u32 \
match ip src 0/0\
$meter4 \
drop flowid :4

######################## Egress side ########################

# attach a dsmarker
#
$TC qdisc add $EGDEV handle 1:0 root dsmark indices 64
#
# values of the DSCP to change depending on the class
#note that the ECN bits are masked out
#
#AF41 (0x88 is 0x22 shifted to the right by two bits)
#
$TC class change $EGDEV classid 1:1 dsmark mask 0x3 \
       value 0x88
#AF42
$TC class change $EGDEV classid 1:2 dsmark mask 0x3 \
       value 0x90
#AF43
$TC class change $EGDEV classid 1:3 dsmark mask 0x3 \
       value 0x98
#BE
$TC class change $EGDEV classid 1:3 dsmark mask 0x3 \
       value 0x0
#
#
# The class mapping
#
$TC filter add $EGDEV parent 1:0 protocol ip prio 1 \
          handle 1 tcindex classid 1:1
$TC filter add $EGDEV parent 1:0 protocol ip prio 1 \
          handle 2 tcindex  classid 1:2
$TC filter add $EGDEV parent 1:0 protocol ip prio 1 \
          handle 3 tcindex  classid 1:3
$TC filter add $EGDEV parent 1:0 protocol ip prio 1 \
          handle 4 tcindex  classid 1:4
#

#
echo "---- qdisc parameters Ingress  ----------"
$TC qdisc ls dev $INDEV
echo "---- Class parameters Ingress  ----------"
$TC class ls dev $INDEV
echo "---- filter parameters Ingress ----------"
$TC filter ls dev $INDEV parent ffff:

echo "---- qdisc parameters Egress  ----------"
$TC qdisc ls $EGDEV
echo "---- Class parameters Egress  ----------"
$TC class ls $EGDEV
echo "---- filter parameters Egress ----------"
$TC filter ls $EGDEV parent 1:0
#
#deleting the ingress qdisc
#$TC qdisc del $INDEV ingress
