Add a IP-to-IP tunneling driver. It supports both IPv4 and IPv6. Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
This can be used to implement tunneling, VPN etc. The virtual interfaces can be chained together to support multilayer network interfaces. Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>