#! /bin/sh

EXT_IFACE=eth0

modprobe imq numdevs=1
# del the qdisc already loaded (if there)
tc qdisc del dev imq0 root

tc qdisc add dev imq0 handle 1: root htb default 12 r2q 1

#          [ HTB queue ]
#                |
#                |
#              [256]  (class 1:1)
#             /  |  \
#            /   |   \
#           /    |    \
#          /     |     \
#         /      |      \
#     [64]       [64]    [128] (note: these add up the the parent's 256)
#     (1:10)     (1:11)  (1:12)
#       |        |        |
#       |        |        |
#     [sfq]    [sfq]    [sfq]
#     (20:0)   (21:0)   (22:0)
# The main link: 252kbit (less is better)
tc class add dev imq0 parent 1: classid 1:1 htb rate 254kbit
# For 10.0.0.9 - 64kbit all to itself - Paul
tc class add dev imq0 parent 1:1 classid 1:10 htb rate 20kbit burst 1kbit prio 1 ceil 36kbit
# For 10.0.0.2 - 64kbit all to itself - Mark
tc class add dev imq0 parent 1:1 classid 1:11 htb rate 20kbit burst 1kbit prio 1 ceil 60kbit
# For 10.0.0.3 and 10.0.0.8 - 128kbit between them - Ryan - Mike
tc class add dev imq0 parent 1:1 classid 1:12 htb rate 200kbit burst 10kbit prio 1 ceil 252kb
it

# SFQ makes things a bit fairer (in theory)
tc qdisc add dev imq0 parent 1:10 handle 20:0 sfq
tc qdisc add dev imq0 parent 1:11 handle 21:0 sfq
tc qdisc add dev imq0 parent 1:12 handle 22:0 sfq

# Match iptables mark 1 and send to class 1:10 (64kbit A)
tc filter add dev imq0 protocol ip pref 1 parent 1: handle 1 fw classid 1:10
# Match iptables mark 2 and send to class 1:11 (64kbit B)
tc filter add dev imq0 protocol ip pref 2 parent 1: handle 2 fw classid 1:11
# Match iptables mark 3 and send to class 1:12 (128kbit)
tc filter add dev imq0 protocol ip pref 3 parent 1: handle 3 fw classid 1:12

# The IMQ device must be up before this will work...
# ip link set imq0 up (set below)

iptables -t mangle -F
iptables -t mangle -X
iptables -t mangle -N incoming
iptables -t mangle -A incoming -d 10.0.0.9 -j MARK --set-mark 1
iptables -t mangle -A incoming -d 10.0.0.2 -j MARK --set-mark 2
iptables -t mangle -A incoming -m mark --mark 1 -j RETURN
iptables -t mangle -A incoming -m mark --mark 2 -j RETURN
iptables -t mangle -A incoming -j MARK --set-mark 3
iptables -t mangle -A FORWARD -i $EXT_IFACE -j incoming
iptables -t mangle -A FORWARD -i $EXT_IFACE -j IMQ

ip link set imq0 up

tc -s -d class show dev imq0