QuickTun
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Support Darwin's native utun device
Apple's XNU kernel supports native TUN interface called utun
from iOS 4.1 and OS X 10.7 Lion. It is a bit different from the standard TUN interface, which is similar with the OpenBSD one.
This patch adds necessary code to build up the utun interface and set session->use_pi = 2
for manipulating TUN devices just like OpenBSD. It is tested to work on OS X 10.9 Mavericks.
References:
OpenVPN utun
patch: http://thread.gmane.org/gmane.network.openvpn.devel/7464/focus=7739
Mac OS X and iOS Internals: http://newosxbook.com/src.jl?tree=listings&file=17-15-utun.c