[Q] tun/tap driver on gsb 3.7 - Droid Eris Q&A, Help & Troubleshooting

since i only have 1 post, can anyone tell me how to get the tuntap driver to load on gsb 3.7? im trying to use the cisco anyconnect for rooted devices, but it appears that cm7 doesn't have the tun/tap driver installed correctly. i was able to download a tun.ko and put it in /system/lib/modules, but it won't execute with insmod (Exec format error).

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Can you post the exact steps you followed, adb commands used, and any reference materials you used?
The first question I had after reading your post was I wondered if you changed permissions after loading the new file to /system.
Good Luck,

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i was trying to get the cicso anyconnect for rooted devices to work, so i followed the following thread:
http://forum.xda-developers.com/showthread.php?t=1164088
i got it copied by remounting the /system mount to rw, then copied the tun.ko file to /system/lib/modules
after that, i did chmod 644 to match the other module in there (wlan.ko) and they are both owned by root.
drwxr-xr-x 1 root root 2048 Jul 10 16:38 .
drwxr-xr-x 1 root root 2048 Jul 10 16:38 ..
drwxr-xr-x 1 root root 2048 Jul 10 16:38 2.6.29-DecaFuctCFS-dirty-9ff84b92
-rw-r--r-- 1 root root 213388 Jul 14 08:28 tun.ko
-rw-r--r-- 1 root root 620128 Aug 1 2008 wlan.ko
then,
insmod /system/lib/modules/tun.ko
insmod: init_module '/system/lib/modules/tun.ko' failed (Exec format error)

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mount -o rw,remount -t yaffs2 /dev/block/mtdblock1 /system
once done
mount -o ro,remount -t yaffs2 /dev/block/mtdblock1 /system
will mount the /system partition back to read only.
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did this to mount /system as read/write.

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What tun.ko module are you trying to use? Try the tun.ko from inside the attached zip which was compiled for Conap's kernel.
Edit: removed attached zip as it doesn't work either

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from the app description:
COMPATIBLE DEVICES:
This release supports rooted Android 2.1+ devices. A compatiable tun.ko module is required, which should be placed in /data/local/kernel_modules/ if the tun module is not built into the kernel. The iptables binary is also required.
For those without root access, a fully supported production AnyConnect for a set of Samsung platforms is available as a separate download from the Android Market.
We cannot guarantee compatibility, but look forward to your feedback.
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i'll try this too. i suppose it would have helped to read the entire app description.
\EDIT: nevermind, that folder doesn't even exist on gsb 3.7

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sirblacknite said:
from the app description:
This release supports rooted Android 2.1+ devices. A compatiable tun.ko module is required, which should be placed in /data/local/kernel_modules/ if the tun module is not built into the kernel. The iptables binary is also required.
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i'll try this too. i suppose it would have helped to read the entire app description.
\EDIT: nevermind, that folder doesn't even exist on gsb 3.7
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Click to collapse
Not sure if it will help but you could create the /data/local/kernel_modules directory and either place tun.ko there or symlink /system/lib/modules that contains tun.ko to the kernel_modules directory. Using adb shell or terminal emulator:
Code:
su
mkdir /data/local/kernel_modules
ln -s /system/lib/modules /data/local/kernel_modules
iptables support is included in the ROM but if you want to try providing the binary in the directory they specify, you can copy it from /system/bin

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didnt' seem to make a difference. i copied the tun.ko from the zip you posted (for conaps kernel) to /system/lib/modules and it still gives the error.
# ls -al /system/lib/modules
ls -al /system/lib/modules
drwxr-xr-x 1 root root 2048 Jul 18 09:09 .
drwxr-xr-x 1 root root 2048 Jul 10 16:38 ..
drwxr-xr-x 1 root root 2048 Jul 10 16:38 2.6.29-DecaFuctCFS-dirty-9ff84b92
-rw-r--r-- 1 root root 160908 Jul 18 09:09 tun.ko
-rw-r--r-- 1 root root 620128 Aug 1 2008 wlan.ko
# insmod /system/lib/modules/tun.ko
insmod /system/lib/modules/tun.ko
insmod: init_module '/system/lib/modules/tun.ko' failed (Exec format error)
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I get the same error when trying to insert it on my Eris running Evervolv Build 4. Or do I need a different tun.ko for that? Thanks.

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sirblacknite said:
didnt' seem to make a difference. i copied the tun.ko from the zip you posted (for conaps kernel) to /system/lib/modules and it still gives the error.
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snortman said:
I get the same error when trying to insert it on my Eris running Evervolv Build 4. Or do I need a different tun.ko for that? Thanks.
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I've tried three different tun.ko modules but none seem to work. I pulled one from GSB 2.3 when workshed included a version to see if it would work, I also tried the one I posted that was from Conap's DecafuctCFSv9 kernel, and another that is in Evervolv(I assume it's a HeroC version).
Not sure if anyone ever found/compiled a tun.ko that worked for the gingerbread roms. It could be that one hasn't been built for the unreleased version of Conap's kernel that is used on all of these roms. I might try to figure out how to compile conap's kernel from his source with the tun.ko module getting built as well.

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MongooseHelix said:
I've tried three different tun.ko modules but none seem to work. I pulled one from GSB 2.3 when workshed included a version to see if it would work, I also tried the one I posted that was from Conap's DecafuctCFSv9 kernel, and another that is in Evervolv(I assume it's a HeroC version).
Not sure if anyone ever found/compiled a tun.ko that worked for the gingerbread roms. It could be that one hasn't been built for the unreleased version of Conap's kernel that is used on all of these roms. I might try to figure out how to compile conap's kernel from his source with the tun.ko module getting built as well.
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That would be cool. Thank you for your help so far on this.

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Mongoose,
That would be awesome if you got the time and were able to do that. I suppose I could give it a stab myself, but I would have to get my dev environment setup first. Or if Cisco would just release a version that didn't require tun.ko, that would be great too (and would be something we could actually use in the company, without suggesting to some of these people who can barely use computers that they need to root their phone).

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any update on this?

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I've not forgotten about it but haven't had the time to look into it any and learn about kernel stuff. I did ask workshed if anyone found or compiled a working tun.ko module for CM7/GSB and he said no. Like I had suspected, he said someone would need to compile the kernel with it included. I'm not sure how difficult it is to figure out so we'll see if one of us can give it a go at some point.

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I compiled and attached a new version of tun.ko that should work for ROMs using kernel version 2.6.29-DecaFuctCFS-dirty-9ff84b92. It's attached below. If the ROM devs would like to include a version of Conap's kernel with built-in tun.ko support, that could probably be done as well.
I haven't actually tested out any VPN stuff so you all will have to report back if it is in fact working. Hope it does!
Instructions:
* Download tun.zip and extract tun.ko
Code:
adb remount
adb push tun.ko /system/lib/modules/
adb shell
cd /system/lib/modules
chmod 644 tun.ko
insmod tun.ko
* check that it was inserted by typing the command "lsmod" which should output something like "tun 11252 0 - Live 0xbf000000"

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that totally worked!
too bad i didnt catch it until the day my new phone was out for delivery, but at least i have something to show my employer that anyconnect actually does work on android.