PREQ handling in hostap on Android

Vijay Swami vijayswami1
Wed Sep 26 06:05:31 PDT 2012


can you remove me from thedistribution list.

I have forgotten my password and user ID of WPA_Supplicant community.

I am no more using Wpa_supplicant.

so please remove me from distribution list.


On Wed, Sep 26, 2012 at 3:02 PM, Jouni Malinen <j at> wrote:

> On Wed, Sep 26, 2012 at 02:03:54PM +0200, Benjamin Grap wrote:
> > My application acts upon specific PREQ packets. For my Linux netbooks
> > with an atheros card this works. Receiving PREQs triggers the
> > handle_probe_req function in ap/beacon.c which I can then use to send
> > messages to my backend.
> This would be the case with drivers that use hostapd for AP mode
> MLME/SME processing.
> > However in the hostapd 0.7.2. from android 4.1 on a Galaxy Nexus phone,
> > PREQs do not seem to ever trigger that function.
> >
> > I assume that those PREQs are already handled by the driver on those
> > devices and never passed to hostapd?
> Correct.
> > But my application relies on
> > receiving those PREQ packets and I was wondering whether there was
> > something that I could do that would pass the PREQs to hostapd.
> Talk to the driver maintainers or use another WLAN device.. This may not
> be easily doable with the device you are using here.
> > Any comments on the inner working of the Android hostapd/driver
> > combination will be much appreciated.
> It's not really specific to Android in any way, but to the architecture
> the WLAN design uses in the system. If Probe Request frames are
> processed in firmware, there is not much hostapd can do about it. Since
> information from Probe Request frames is needed to allow WPS to be
> implemented correctly, you may have some luck of at least receiving
> information (like WPS IE) from the received Probe Request frames, but
> this depends on the driver in question.
> --
> Jouni Malinen                                            PGP id EFC895FA
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