ath(4) hostap with fake MAC/BSSID results in station dropping packets when associated

[Alexandre L.]

Hi Martin,

I got similar problem from my PC using a Netgear WG311T PCI wireless card.

ath0: <Atheros 5212> mem 0x40100000-0x4010ffff irq 11 at device 8.0 on pci1
ath0: AR2413 mac 7.9 RF2413 phy 4.5

I have joined all my config files, and the results of the commands : 
# dmesg
# ifconfig
# dhclient wlan0

Also, I have opened before your mail to the list, a thread on FreeBSD Forums http://forums.freebsd.org/showthread.php?t=16373 

--- En date de : Mer 28.7.10, Martin <nakal at web.de> a écrit :

> De: Martin <nakal at web.de>
> Objet: ath(4) hostap with fake MAC/BSSID results in station dropping packets when associated
> À: freebsd-stable at freebsd.org
> Date: Mercredi 28 juillet 2010, 22h24
> 
> Hi,
> 
> I noticed a bug that was introduced somewhere in the
> Atheros 9280
> support in 8.1-RELEASE when used as a station. I had this
> already
> running correctly with 7.x releases.
> 
> What happens:
> 
> I cannot connect to a hostap ath(4) (Atheros 2413) when
> using a fake
> MAC/BSSID (on the hostap!).
> 
> How to reproduce it:
> 
> 1) Put this into your rc.local on your hostap machine and
> replace xx's
> by an address of your choice (first octet needs to have
> lowest bit "0"):
> 
> ifconfig ath0 ether xx:xx:xx:xx:xx:xx
> 
> 2) Start hostapd (must be configured, of course).
> Eventually you need
> to set BSSID also in hostapd.conf.
> 
> 3) Try to connect with an Atheros 9280. You don't need to
> fake MAC
> address here (I'm only talking about the hostap
> MAC/BSSID).
> 
> What you get:
> 
> - You get association. This is OK, so far.
> - Try DHCP. You won't see packets arriving at the station.
> They are not
>   recognized and filtered somewhere.
> - When you watch with tcpdump on the hostap interface
> you'll see DHCP
>   requests arriving and being answered.
> - I further noticed, even you don't have any IP (set to
> 0.0.0.0,
>   because of failed DHCP), you can see packets being
> sent to different
>   machines
> - You can try to setup a static address, but when you ping
> the station,
>   you don't see a ping arriving (watch tcpdump on the
> station wireless
>   interface and try to ping from the hostap machine).
> 
> Further information:
> 
> - This only affects ath(4) and I could only see this on
> Atheros 9280,
>   because I don't have any other ath(4) adapters at
> the moment.
> - I tried rum(4). It does not have any problems like this.
> DHCP and
>   everything else works with this driver (of course
> with a fake
>   MAC/BSSID!).
> - Running 8.1-RELEASE on all machines. Kernel is GENERIC,
> but on hostap
>   machine there is ALTQ added (should not affect
> anything, as I said,
>   I had this running already).
> - hostapd is configured with 11g, WPA2 and passwords in
> hostapd.wpapsk.
>   WME is switched off, because it does not work at all
> for me.
> 
> I can provide more information, if needed.
> 
> --
> Martin
> _______________________________________________
> freebsd-stable at freebsd.org
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>


      
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