Kindle 4 NT for WIFI tethering

[matz]

Hello,

I want to use my Kindle 4 NT as an USB-WIFI 'stick':
connect the Kindle via USB to my Computer/Raspberry/etc. and to IP-forward the Wifi-Internet-connection of the Kindle to a client.

The problem with the kindle is, that although iptables is there, the ability of ip_forwarding and masquerading is missing due to missing modules.

The KUAL-developer(s) provide these modules in principle:
(https://www.mobileread.com/forums/att...7&d=1361917519), however I can't load the modules on my very device.

I have a jailbreaked device (k4nt) with usbnet running and I tried to insmod the additional kernel modules:
nf_nat.ko and iptables_nat.ko
(in /mnt/us/extensions/system/lib/modules/2.6.31-rt11-lab126/kernel/net/ipv4/netfilter after mounting the cfs-file from KUAL-project)

I get the following error message:

[root@kindle netfilter]# insmod nf_nat.ko
insmod: error inserting 'nf_nat.ko': -1 Unknown symbol in module

ARE THERE ANY DIFFERENT PRECOMPILED MODULE FILES THAT WOULD WORK WITH MY K4NT?

The system output is the following:
/var/log/messages (for insmod nf_nat.ko)

150517:182829 nf_nat: Unknown symbol nf_conntrack_tcp_update
150517:182829 nf_nat: Unknown symbol local_bh_enable
150517:182829 nf_nat: Unknown symbol local_bh_disable

[root@kindle netfilter]# uname -a
Linux kindle 2.6.31-rt11-lab126 #5 Sat Jan 12 20:39:09 PST 2013 armv7l unknown

[root@kindle netfilter]# cat /etc/version.txt
System Software Version: 025-H3_yoshi-181303
Sat Jan 12 20:40:53 PST 2013

[root@kindle netfilter]# cat /etc/prettyversion.txt
Kindle 4.1.1 (~~otaVersion~~)


Thanks in advance, Matz.

(some old threads on this topic did not helped me with this problem:
https://www.mobileread.com/forums/arc.../t-213678.html
https://www.mobileread.com/forums/arc.../t-208766.html)

[brianinmaine]

https://www.mobileread.com/forums/sho...compile+kernel

A while back, I made one for my Touch. I just used the modules I made and they worked fine. I think I used modules for mounting swap over the network...

My suggestion is - make your own

[Glorfindel]

@Matz: Let me know if you get this working, I have been trying as well.

[hawhill]

Other modules are missing, I guess.

[brianinmaine]

OK, this is a long one, I tried to make all the instructions to compile a kernel for K4nt (I think I use Debian (Jessie) as my host. At the end, I am able to add whatever modules I want. I highly recommend building your own modules!

HOST:
apt-get install debootstrap qemu-user-static binfmt-support
dd if=/dev/zero of=debian_image.ext3 bs=1M count=10000
mkfs.ext3 debian_image.ext3
tune2fs -i 0 -c 0 debian_image.ext3
mkdir -p /mnt/debian
mount -o loop -t ext3 debian_image.ext3 /mnt/debian
mkdir -p /mnt/debian/usr/bin
cp /usr/bin/qemu-arm-static /mnt/debian/usr/bin

for me, I use an iso of Debian Wheezy armel: debian-7.7.0-armel-DVD-1.iso
mkdir /mnt/iso
mount debian-7.7.0-armel-DVD-1.iso /mnt/iso
debootstrap --arch=armel --variant=buildd --no-check-gpg wheezy /mnt/debian file:///mnt/iso/debian
mkdir -p /mnt/debian/mnt/iso
mount --bind /mnt/iso /mnt/debian/mnt/iso
leafpad /mnt/debian/etc/apt/sources.list
deb [ trusted=yes ] file:/mnt/iso/debian wheezy main contrib

or continue using the web:
debootstrap --arch=armel wheezy /mnt/debian http://ftp.us.debian.org/debian
mount -o bind /dev /mnt/debian/dev
mount -o bind /dev/pts /mnt/debian/dev/pts
mount -o bind /proc /mnt/debian/proc
mount -o bind /sys /mnt/debian/sys
chroot /mnt/debian /bin/bash

CHROOT:
apt-get update
apt-get install locales vim
dpkg-reconfigure locales *FYI I selected 138 (en_US.UTF-8)
vim /etc/apt/sources.list
deb http://ftp.us.debian.org/debian wheezy main contrib non-free
deb-src http://ftp.us.debian.org/debian wheezy main contrib non-free
apt-get update

FINALLY, here's the Kernel stuff!

HOST:
I downloaded and extracted the source, I think for Kindle4NT?? (Kindle_src_4.1.2_???)
then I copied the linux source to /mnt/debian/usr/src


CHroot:
apt-get install ncurses-dev
cd /usr/src
tar jxf linux-2.6.31.tar.bz2
cd linux-2.6.31
make imx50_tequila_defconfig

Here it gets interesting:
I downloaded source for Kindle Touch 5.1.0 and extracted to get a few files,
as per the Touch wiki.
from 5.1.0 for Touch:
copy these to the chroot usr/src/linux-2.6.31/include folder:
include/llog.h
include/linux/einkfb.h
include/boardid.h
** had to modify to add definition for finkle (just a hack to make it work,
I have NO IDEA what I'm doing this was to make the display driver compile,
and we don't need that anyway.
#define BOARD_ID_FINKLE "004"


then, in the chroot you should be able to:

make menuconfig
*** make any changes, make into modules ***
make modules

from here, it's up to you - install the modules to your image and copy from there or
whatever you want. Good luck!