OpenVPN on Kindle 3G

[Pipeliners]

I eventually managed to run OpenVPN on my Kindle 3 device.
I'll write short story and instructions now and if somebody wants i'll complete them.

DISCLAIMER: that was the first time I hacked Linux kernel. I think I could have done something wrong.

1. You have to install OpenVPN properly. I used the simplest way and installed Debian chroot (FIXME link) and then ran `aptitude install openvpn'
2. It won't run because Kindle linux kernel doesn't have TUN driver. You have to build it yourself or used attached tun.ko module. {
2.1. Download latest Kindle firmware sources from http://www.amazon.com/gp/help/custom...deId=200203720
2.2. Install ARM crosscompiling toolchain. I got one from ftp://ftp.denx.de/pub/eldk/4.2/arm-l...2008-11-24.iso
2.3. -- To be completed
}
3. Copy resulting tun.ko module to Debian chroot on Kindle.
4. You can now run OpenVPN with script like this:

#!/bin/sh
vpnsetup () {
	echo "Starting VPN..."
	insmod /lib/modules/2.6.26-rt-lab126/kernel/drivers/net/tun.ko
	cd /etc/openvpn/
	iptables -A INPUT -i tap0 -j ACCEPT
	openvpn YOURCONFIG.conf
}
vpnshutdown () {
	echo "Stopping VPN..."
	iptables -D INPUT -i tap0 -j ACCEPT
	rmmod tun
}

trap vpnshutdown 1 2 9 15
vpnsetup

[dasmoover]

I thank you very much for this my good sir.

[Pipeliners]

// I can not see edit button for the post so continue in comments.
2.2. Install ELDK. I did it this way:

# mount -o loop -t iso9660 arm-2008-11-24.iso /mnt/tmp
# adduser arm-eldk
# su arm-eldk

$ /mnt/tmp/install
$ echo '. $HOME/eldk_init arm' >> .bashrc
$ source $HOME/eldk_init arm

Now we can build test program with arm-linux-gcc

2.3. Configuring and building kernel.

$ make imx35_luigi_defconfig
$ make menuconfig
Device Drivers --->
   Network device support --->[*]Network device support
<M>   Universal TUN/TAP device driver support

$ sed -e 's/CONFIG_INITRAMFS_SOURCE=.*/CONFIG_INITRAMFS_SOURCE=""/' -i .config
$ make modules

Enjoy your own tun.ko at ./drivers/net!

Special thanks to

• yifanlu for https://www.mobileread.com/forums/showthread.php?t=91862, https://www.mobileread.com/forums/showthread.php?t=99477 and more posts
• andy wooden for http://www.the-ebook.org/forum/viewt...=438807#438807
• …and many other good people.