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Re: P2P_DEVICE support in Android KitKat

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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 parameters

Here is p2p_supplicant service instantiating the wpa_supplicant.

service p2p_supplicant /system/bin/wpa_supplicant -Dnl80211 -iwlan0 \
  -g@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).

Regards,
Arend
ctrl_interface=/data/misc/wifi/sockets
update_config=1
driver_param=use_p2p_group_interface=1p2p_device=1
eapol_version=1
ap_scan=1
fast_reauth=1
device_name=BRIX-t1
device_type=10-0050F204-1
config_methods=keypad display push_button


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