#!/bin/sh

DEV="ppp0"
UPLINK="448"
UPLINK_SMALLER="320"
DOWNLINK="8128"

tc qdisc del dev "$DEV" root >/dev/null 2>&1

tc qdisc add dev "$DEV" root handle 1: htb default 30
tc class add dev "$DEV" parent 1: classid 1:1 htb rate "${UPLINK}kbit" burst 6k

# Absolute maximum priority
tc class add dev "$DEV" parent 1:1 classid 1:10 htb rate "${UPLINK}kbit" burst 6k prio 1
tc qdisc add dev "$DEV" parent 1:10 handle 10: htb

# High priority
tc class add dev "$DEV" parent 1:1 classid 1:20 htb rate "${UPLINK}kbit" burst 6k prio 2
tc qdisc add dev "$DEV" parent 1:20 handle 20: htb

# Low priority
tc class add dev "$DEV" parent 1:1 classid 1:30 htb rate "${UPLINK_SMALLER}kbit" burst 6k prio 3
tc qdisc add dev "$DEV" parent 1:30 handle 30: htb

# Match UDP
tc filter add dev "$DEV" parent 1:0 protocol ip prio 1 u32 match ip protocol 0x11 0xff flowid 1:10

# Match interactive TOS
tc filter add dev "$DEV" parent 1:0 protocol ip prio 10 u32 match ip tos 0x10 0xff flowid 1:20

# Match ICMP
tc filter add dev "$DEV" parent 1:0 protocol ip prio 10 u32 match ip protocol 1 0xff flowid 1:20

# Match ACK
tc filter add dev "$DEV" parent 1: protocol ip prio 10 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 1:20