Compiling tun kernel module for android 2.2 (for Viewsonic Viewpad 7)
root your device with some program. I used this one z4root.1.3.0.apk.
Here is also local copy if link above does not work: z4root.1.3.0.apk
get the source (you need git for this one)
$ mkdir tmp
$ cd tmp
$ git clone git://android.git.kernel.org/kernel/common kernel
$ cd kernel
$ git checkout -t origin/android-goldfish-2.6.32
Prepare it for cross-compiling for ARM
export ARCH=arm
export CROSS_COMPILE=/path/to/android/source/prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/bin/arm-eabi-
make mrproper
Get the old configuration of your device
adb pull /proc/config.gz config.gz
Copy the file in your kernel dir
zcat config.gz > .config
make menuconfig
under device drivers->network->
check as module (M) TUN interface
exit and save
$ make modules
Now you have compiled kernel module for tun/tap interfaces
Copy drivers/net/tun.ko somewhere and put it on your device
adb push tun.ko /system/lib/modules
and test if it works
adb shell
# insmod /system/lib/modules/tun.ko
you should see that module is inserted
# lsmod
lsmod
tun 12487 2 - Live 0x7f04f000
ar6000 254669 0 - Live 0x7f000000
#
Now your android is almost ready for installation of openvpn on it.
Since original android viewpad openssl lib does not have all ciphers you need to update it.
Use this link for instructions to update your libssl/liblzo/libcrypto: TunnelDroid README
OpenVPN/libssl/liblzo/libcrypto in one zip - get it from here: TunnelDroid Files or a local copy here: openvpn-binary.zip
Now browse android market and install OpenVPN Installer and OpenVPN Settings then follow the instructions.
OpenVPN Installer have some configuration options about where is your busybox installed and makes proper links
Finally use OpenVPN settings for final configuration of the openvpn.
Useful links:
http://code.google.com/p/android-openvpn-installer/issues/detail?id=2
cross compiling android
tun.ko - module for android 2.2, kernel 2.6.32.9, ARM arch
config.gz - kernel config.gz downloaded from viewpad7 (android 2.2)
android-viewpad7 - check out this dir for more android stuff
link to original page: http://www.horizon9.org/~geroy/
