ipt_ROUTE Netfilter module ported to Linux 2.6.31

The ipt_ROUTE module became depreciated in an earlier version of Linux 2.6 – however I needed it so ported it to Linux Kernel version 2.6.31.

Disclaimer: wherever possible iproute2 should be used to achieve the desired effect.

The sources include the Kernel module and extensions to iptables.

This module and iptables extension create a new target which may be used on the mangle table.
Target usage: -j ROUTE <option>
--oif ifname - Route packet through `ifname' network interface
--iif ifname - Change packet's incoming interface to `ifname'
--gw ip - Route packet via this gateway `ip'
--continue - Route packet and continue traversing the rules. (Not valid with --iif or --tee)
--tee - Duplicate packet and route the duplicate, continue traversing the original packet. (Not valid with --iif or --continue)

I have tested the ported module on the PREROUTING and INPUT chains of the mangle table.

I use this module to route packets that have a destination IP address which matches a local IP address, out of an ethernet interface (using --oif option). These packets would normally be directed to the local system.