This is an old revision of the document!
Note: This page is about the older acx100/acx111 drivers. For the new mac80211-based driver, see acx1xx.
There is legal controversy surrounding the development of this driver, see the wireless mailing list for more information. Until that is cleared, we suggest to not use or download this driver. See kernel inclusion section for some background information on the previous attempt to include it in the mainline kernel.
This is a short report about acx driver. See this thread for details.
There are 3 version of the driver: - plain - SoftMac - mac80211
The current stable release of the “plain” driver is v0.3.36 (acx-20070101) and it works t works on kernels equal or greater than 2.6.10.
For kernel 2.6.21-22, a patch is needed: http://acx100.sourceforge.net/wiki/Patch_2.6.22 The driver does not support WPA.
The driver can be patched for injection with the instructions below on this page.
The SoftMac version uses deprecated stack layer, it's not updated anymore.
The mac80211 version is still in beta. It requires a kernel equal or greater than 2.6.18 (with mac80211 support). Starting with 2.6.27, it will be integrated in the kernel.
From kernel 2.6.23 forward, an injection patch is already integrated in the mac80211 stack in the kernel mainline. For fragmentation attack support, an additional patch is required. See the mac80211 page for more details.
All versions require a non-GPL firmware in /lib/firmware/, you can find it online.
Read more at: http://acx100.sourceforge.net/wiki/Main_Page
You need to use a kernel version>= 2.6.10:
ifconfig wlan0 down rmmod acx wget http://www.cmartin.tk/acx/acx-20070101.tar.bz2 tar -xjf acx-20070101.tar.bz2 cd acx-20070101 wget http://patches.aircrack-ng.org/acx-20070101.patch patch -Np1 -i acx-20070101.patch make -C /lib/modules/`uname -r`/build/ M=`pwd` modules make -C /lib/modules/`uname -r`/build/ M=`pwd` modules_install modprobe acx
note: if the code doesn't work, Ubuntu users will want to change the following lines:
make -C /lib/modules/`uname -r`/build/ M=`pwd` modules make -C /lib/modules/`uname -r`/build/ M=`pwd` modules_install
and replace `uname -r` by the name of their current kernel, followed by generic. The reason for this is that the actual modules directory for the current kernel (which is what the /lib/modules/`uname -r`/ commande will return) does not contain the build symbolic link, and therefore no makefile will be found for the make command. Only the /lib/modules/2.6.20-16-generic/ contains a simlink called “build” that will ensure the proper makefile is found.
ie: as of 26th of June 2007, under Ubuntu 7.04 “Feisty Fawn”, the correct lines would be:
make -C /lib/modules/2.6.20-16-generic/build/ M=`pwd` modules make -C /lib/modules/2.6.20-16-generic/build/ M=`pwd` modules_install
You get kernel messagess similar to: Jul 3 00:44:12 ubuntop kernel: [ 736.008000] wlan0: FAILED to free any of the many full tx buffers. Switching to emergency freeing. Please report! Jul 3 00:44:12 ubuntop kernel: [ 736.008000] wlan0: tx timeout!
From the author of the driver patch:
That's a problem with the driver. I saw it several times while writing the acx111 patch. It works like this:
Every packet you transmit allocates a tx buffer, so it will start filling up the whole buffer space until its freed again and that's the point. It just doesn't get freed in time. Once you reached the limit and have eaten up all available buffers, it won't work again until you reload the driver. Its waiting for a TX_COMPLETE message…
Possible workarounds (don't know for sure right now, just try it):