Code hacked together from netmap-ipfw and linux's netfilter. Tested with debian's 3.2 kernel, debian's 1.4.14-3.1 iptables.
The following needs to be added to /lib/modules/3.2.0-4-amd64/build/include/generated/autoconf.h:
#undef CONFIG_NET_NS
#undef CONFIG_XFRM
#undef CONFIG_NF_CONNTRACK_PROC_COMPAT
#undef CONFIG_SMP
#undef CONFIG_MODULE_UNLOAD
#undef CONFIG_CC_STACKPROTECTOR
Remove CONFIG_CC_STACKPROTECTOR=y from /lib/modules/3.2.0-4-amd64/build/include/config/auto.conf
Compiling:
mkdir ~/netmap
cd ~/netmap
git clone https://github.com/luigirizzo/netmap
apt-get source iptables
git clone https://github.com/koszik/netmap-netfilter
cd netmap-netfilter
./link
Running:
./main netmap:eth1 netmap:eth1^
sh fw
./iptables -L -vnx