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I'd recommend _Linux_Device_Drivers_, by Jonathan Corbet, Alessandro Rubini, & Greg Kroah-Hartman. I believe the 3rd Edition is the latest, and it is a bit old (2005), but still good. There are many other good books on Linux device drivers and kernel programming. Another great resource for something similar to a VPN client would be the documentation and source code for OpenVPN: https://sourceforge.net/projects/openvpn/ https://forums.openvpn.net/ http://community.openvpn.net/openvpn
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