RPI 3b - TP-Link T4U (Realtek RTL8812AU) - Kali 2017.1

[cobrawnl]

Dear Community,

Since Kali 2017.1 there is Support for RTL8812AU Wireless Card Injection.
I am the lucky owner of a TP-Link T4u (v1.0) with this chipset.

The installation directions where quite easy:

apt-get update
apt install realtek-rtl88xxau-dkms

However this didnt work out as expected:

...
Building for 4.4.50-v7
Building initial module for 4.4.50-v7
Error! Bad return status for module build on kernel: 4.4.50-v7 (armv7l)
Consult /var/lib/dkms/realtek-rtl88xxau/4.3.21~20170330/build/make.log for more information.

When consulting the make.log i see the following:

DKMS make.log for realtek-rtl88xxau-4.3.21~20170330 for kernel 4.4.50-v7 (armv7l) 
arb leq 9 9:54:41 saaku UTC 2017
make ARCH=armv7l CROSS_COMPILE= -C /lib/modules/4.4.50-v7/build M=/var/lib/dkms/realtek-rtl88xxau/4.3.21~20170330/build modules
make[1]: Entering directory 'usr/src/kernel'
Makefile:617: arch/armv7l/Makefile: No such file or directory
make[1]: *** No rule to make target 'arch/armv7l/Makefile' .  Stop.
make[1]: Leaving directory '/usr/src/kernel'
Makefile:1717: recipe for target 'modules' failed
make: *** [modules] Error 2

Hope someone can help me out,

[re4son]

Hi cobrawnl,

You can try this workaround:

cd /var/lib/dkms/realtek-rtl88xxau/4.3.21~20170330/build
make ARCH=arm && make install

That should do the trick.
You'll need the kernel headers for that to work though. You probably want to install the re4son-kernel to get those:
https://whitedome.com.au/re4son/re4son-kernel/

Please let us know if that works,
Re4son

[re4son]

Easier way:

- Install re4son-kernel
- Install re4son-kernel headers
- run:

ln -s /lib/modules/`uname -r`/build/arch/arm /lib/modules/`uname -r`/build/arch/`uname -m`

And dkms will hopefully live happily ever after.

[cobrawnl]

Cool thanks! That worked and installed the driver succesfully.

However i'm not able to get the device in monitor mode:

root@kali:~$ lsmod 
Module                  Size  Used by
...
brcmfmac             223198  0
8812au                1382090  0
...

root@kali:~# airmon-ng check kill
root@kali:~# airmon-ng start wlan1
PHY     Interface       Driver          Chipset
phy0    wlan0           brcmfmac     Broadcom 43430
phy1    wlan1           8812au
cat: /sys/class/ieee80211/phy1/device/net/wlan1mon/type: No such file or directory

Newly created monitor mode interface wlan1mon is *NOT* in monitor mode.
Removing non-monitor wlan0mon interface...

WARNING: unable to start monitor mode, please run "airmon-ng check kill"

I Also tried to start monitor mode on the internal chip, but that gave me another error:

root@kali:~# airmon-ng start wlan0

PHY     Interface       Driver          Chipset
phy0    wlan0           brcmfmac     Broadcom 43430

ERROR adding monitor mode interface: command failed: Operation not supported ( -95)

Any ideas?