P2P_DEVICE support in Android KitKat

Arend van Spriel arend
Wed Sep 10 07:15:05 PDT 2014

On 09/10/14 13:10, Jouni Malinen wrote:
> On Wed, Sep 10, 2014 at 09:30:05AM +0200, Arend van Spriel wrote:
>> I am running some tests on a haswell target with Android KitKat
>> (3.10.20 kernel). In this configuration our brcmfmac driver is used
>> with driver param 'p2p_device=1'. So we end up with wlan0 and
>> p2p-dev-wlan0 interfaces (can blame myself for that). The
>> configuration has a network configured, but I did not expect
>> wpa_supplicant to start association using the p2p device interface.
>> The wlan0 interface is already connected to the AP. How can I fix
>> this to assure p2p-dev-wlan0 is only used for p2p management
>> scenarios.
> Hmm.. Can you please show the wpa_supplicant command line that is used
> here and describe how that network block gets configured for the
> p2p-dev-wlan0 "interface"? I would have expected that there would never
> be a configuration with an enabled network block being passed for the
> P2P management interface.. Internally, wpa_supplicant should not add
> such for P2P groups, but I don't think there is any filtering on
> configuration if something is externally trying to make wpa_supplicant
> use that management interface for a station mode connection.

Hi Jouni,

Jithu informed me about the '-m' command line option so digging in git 
revision history I found the commit from Ilan which kind of describes 
what I am seeing

c16a759 wpa_supplicant: Add a configuration file for the P2P_DEVICE 

Here is p2p_supplicant service instantiating the wpa_supplicant.

service p2p_supplicant /system/bin/wpa_supplicant -Dnl80211 -iwlan0 \
   -g at android:wpa_wlan0 -c/data/misc/wifi/p2p_supplicant.conf -dt

The p2p_supplicant.conf has update_config=1 set which is also mentioned 
in the commit message. Without -m option p2p-dev-wlan0 is created using 
the same config file as for wlan0 so some filtering would be required 
(or use -m).

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