NFQUEUE handler source example

["Mike Herms" <mherms@gmail.com>]

Short question:
Does anyone have example source code for user land handling of packets
off of NFQUEUE in a bridged environment?  I believe that I've
successfully created a bridged environment as follows:
============================
ifconfig eth0 promisc up
ifconfig eth0 promisc up
brctl addbr br0
brctl stp br0 off
brctl setbridgeprio br0 2
brctl addif br0 eth0
brctl addif br0 eth1
ifconfig br0 0.0.0.0

echo 1 > /proc/sys/net/ipv4/ip_forward
============================
Using the above configuration and connecting my box between two
networks or a network and a client computer works great.  Both sides
work and the bridge appears transparent to them.

I try to handle packets in my userland application by sending them to
an NFQUEUE using:
============================
sudo iptables -t mangle -A FORWARD -m physdev --physdev-in eth0 -j
NFQUEUE --queue-num 0
sudo iptables -t mangle -A FORWARD -m physdev --physdev-in eth1 -j
NFQUEUE --queue-num 0
============================

After I create the above two rules traffic no longer gets through the
bridge, as I'd suspect since it must now be handled by someone reading
from the NFQUEUE.

============================
sudo iptables -t mangle --list -v
============================
Shows packets reaching both physical devices.  My problem is I cannot
get my application to get a notification that something is in the
queue so it can be handled.  I'm can post my source but a working
skeleton example would get me there just as quickly without people
debugging my code.

Version information:
bridge-utils v1.2
iptables v1.4.0
ebtables v2.0.8-1 (May 2007
arptables v0.0.3-3

Thanks,
Mike Herms