Examples for match by mark in u32
Author: Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
Link: http://kernel.umbrella.ro/

. Match mark 6 and dest 4.4.4.4 and redirect this to class 1:6:
	tc filter add dev eth0 protocol ip parent 1:0 prio 5 u32 \
	match mark 0x0006 \
	match ip dst 4.4.4.4 \
	flowid 1:6

. Match only mark 0x0090 and send traffic to class 1:90:
	tcmark filter add dev eth0 protocol ip parent 1:0 prio 5 u32 \
	match mark 0x0090 \
	flowid 1:90

. Complete example of how to match mark 6 and a destination port bigger than 1023:
#!/bin/sh

# By Catalin(ux aka Dino) BOIE catab at umbrella.ro

tc qdisc del dev dummy0 root
tc qdisc add dev dummy0 root handle 1: htb default 20

# root class
tc class add dev dummy0 parent 1: classid 1:1 \
	htb rate 100Kbit ceil 100Kbit
        
# clasa protocol 50 ( = 0x32)
tc class add dev dummy0 parent 1:1 classid 1:50 \
	htb rate 50Kbit ceil 50Kbit
        
# clasa default
tc class add dev dummy0 parent 1:1 classid 1:20 \
	htb rate 50Kbit ceil 50Kbit
        
# send a packet with mark 3 and tcp with dport >= 1024 to 1:50
tc filter add dev dummy0 \
	protocol ip \
	parent 1: prio 13 \
	u32 \
	match mark 0x0003 0xffff \
	match ip dport 0x0400 0x0400 \
	flowid 1:50