P2P_DEVICE support in Android KitKat

Hi Jouni,

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.

Regards,
Arend

---8<------------------------------------------------------------------
D/wpa_supplicant( 2613): p2p-dev-wlan0: 12: c0:c1:c0:04:b8:2c ssid='NSN24' wpa_ie_len=0 rsn_ie_len=0 caps=0x401 level=-36 wps
D/wpa_supplicant( 2613): p2p-dev-wlan0: allow in non-WPA/WPA2
D/wpa_supplicant( 2613): p2p-dev-wlan0: selected BSS c0:c1:c0:04:b8:2c ssid='NSN24'
D/wpa_supplicant( 2613): p2p-dev-wlan0: Considering connect request: reassociate: 0 selected: c0:c1:c0:04:b8:2c bssid: 00:00:00:00:00:00 pending: 00:00:00:00:00:00 wpa_state: SCANNING ssid=0xf9074cd0 current_ssid=0x0 D/wpa_supplicant( 2613): p2p-dev-wlan0: Request association with c0:c1:c0:04:b8:2c
D/wpa_supplicant( 2613): WPA: Unrecognized EAPOL-Key Key Data IE - hexdump(len=7): 00 05 4e 53 4e 32 34
D/wpa_supplicant( 2613): WPA: Unrecognized EAPOL-Key Key Data IE - hexdump(len=3): 03 01 0b
D/wpa_supplicant( 2613): WPA: Unrecognized EAPOL-Key Key Data IE - hexdump(len=6): 05 04 00 01 00 00
D/wpa_supplicant( 2613): WPA: Unrecognized EAPOL-Key Key Data IE - hexdump(len=3): 2a 01 00
D/wpa_supplicant( 2613): WPA: Unrecognized EAPOL-Key Key Data IE - hexdump(len=3): 2f 01 00
D/wpa_supplicant( 2613): WPA: Unrecognized EAPOL-Key Key Data IE - hexdump(len=24): 3d 16 0b 0f 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
D/wpa_supplicant( 2613): WPA: Unrecognized EAPOL-Key Key Data IE - hexdump(len=16): 4a 0e 14 00 0a 00 2c 01 c8 00 14 00 05 00 19 00
D/wpa_supplicant( 2613): TDLS: TDLS is allowed in the target BSS
I/wpa_supplicant( 2613): p2p-dev-wlan0: Trying to associate with SSID 'NSN24'
D/wpa_supplicant( 2613): CTRL_IFACE monitor send - hexdump(len=40): 2f 64 61 74 61 2f 6d 69 73 63 2f 77 69 66 69 2f 73 6f 63 6b 65 74 73 2f 77 70 61 5f 63 74 72 6c ... D/wpa_supplicant( 2613): p2p-dev-wlan0: Cancelling scan request
D/wpa_supplicant( 2613): p2p-dev-wlan0: P2P: Station mode scan operation not pending anymore (sta_scan_pending=0 p2p_cb_on_scan_complete=0)
D/wpa_supplicant( 2613): p2p-dev-wlan0: WPA: clearing own WPA/RSN IE
D/wpa_supplicant( 2613): p2p-dev-wlan0: Automatic auth_alg selection: 0x1
D/wpa_supplicant( 2613): p2p-dev-wlan0: WPA: clearing AP WPA IE
D/wpa_supplicant( 2613): p2p-dev-wlan0: WPA: clearing AP RSN IE
D/wpa_supplicant( 2613): p2p-dev-wlan0: WPA: clearing own WPA/RSN IE
D/wpa_supplicant( 2613): p2p-dev-wlan0: No keys have been configured - skip key clearing
D/wpa_supplicant( 2613): p2p-dev-wlan0: State: SCANNING -> ASSOCIATING
D/wpa_supplicant( 2613): wpa_driver_nl80211_set_operstate: operstate 0->0 (DORMANT)
D/wpa_supplicant( 2613): netlink: Operstate: linkmode=-1, operstate=5
D/wpa_supplicant( 2613): CTRL_IFACE monitor send - hexdump(len=40): 2f 64 61 74 61 2f 6d 69 73 63 2f 77 69 66 69 2f 73 6f 63 6b 65 74 73 2f 77 70 61 5f 63 74 72 6c ... D/wpa_supplicant( 2613): nl80211: Set mode ifindex 0 iftype 2 (STATION)
D/wpa_supplicant( 2613): nl80211: Failed to set interface 0 to mode 2: -22 (Invalid argument)
D/wpa_supplicant( 2613): nl80211: Try mode change after setting interface down
D/wpa_supplicant( 2613): nl80211: Stop P2P Device p2p-dev-wlan0 (0x2): Success
D/wpa_supplicant( 2613): nl80211: Set mode ifindex 0 iftype 2 (STATION)
D/wpa_supplicant( 2613): nl80211: Failed to set interface 0 to mode 2: -22 (Invalid argument)
D/wpa_supplicant( 2613): nl80211: Start P2P Device p2p-dev-wlan0 (0x2): Success
D/wpa_supplicant( 2613): nl80211: Interface mode change to 2 from 10 failed
I/wpa_supplicant( 2613): p2p-dev-wlan0: Association request to the driver failed
D/wpa_supplicant( 2613): CTRL_IFACE monitor send - hexdump(len=40): 2f 64 61 74 61 2f 6d 69 73 63 2f 77 69 66 69 2f 73 6f 63 6b 65 74 73 2f 77 70 61 5f 63 74 72 6c ... D/wpa_supplicant( 2613): Added BSSID 00:00:00:00:00:00 into blacklist
D/wpa_supplicant( 2613): p2p-dev-wlan0: Blacklist count 1 --> request scan in 100 ms
D/wpa_supplicant( 2613): p2p-dev-wlan0: Setting scan request: 0 sec 100000 usec
D/wpa_supplicant( 2613): p2p-dev-wlan0: P2P: Station mode scan operation not pending anymore (sta_scan_pending=0 p2p_cb_on_scan_complete=0)
D/wpa_supplicant( 2613): p2p-dev-wlan0: State: ASSOCIATING -> DISCONNECTED
D/wpa_supplicant( 2613): wpa_driver_nl80211_set_operstate: operstate 0->0 (DORMANT)
D/wpa_supplicant( 2613): netlink: Operstate: linkmode=-1, operstate=5
D/wpa_supplicant( 2613): CTRL_IFACE monitor send - hexdump(len=40): 2f 64 61 74 61 2f 6d 69 73 63 2f 77 69 66 69 2f 73 6f 63 6b 65 74 73 2f 77 70 61 5f 63 74 72 6c ... D/wpa_supplicant( 2613): p2p-dev-wlan0: P2P: Station mode scan operation not pending anymore (sta_scan_pending=0 p2p_cb_on_scan_complete=0)
D/wpa_supplicant( 2613): RX ctrl_iface - hexdump(len=11): 53 49 47 4e 41 4c 5f 50 4f 4c 4c
D/wpa_supplicant( 2613): wlan0: Control interface command 'SIGNAL_POLL'
D/wpa_supplicant( 2613): nl80211: survey data missing!
D/wpa_supplicant( 2613): p2p-dev-wlan0: State: DISCONNECTED -> SCANNING
D/wpa_supplicant( 2613): CTRL_IFACE monitor send - hexdump(len=40): 2f 64 61 74 61 2f 6d 69 73 63 2f 77 69 66 69 2f 73 6f 63 6b 65 74 73 2f 77 70 61 5f 63 74 72 6c ... D/wpa_supplicant( 2613): p2p-dev-wlan0: Starting AP scan for wildcard SSID
D/wpa_supplicant( 2613): WPS: Building WPS IE for Probe Request
D/wpa_supplicant( 2613): WPS: * Version (hardcoded 0x10)
D/wpa_supplicant( 2613): WPS: * Request Type
D/wpa_supplicant( 2613): WPS: * Config Methods (4288)
D/wpa_supplicant( 2613): WPS: * UUID-E
D/wpa_supplicant( 2613): WPS: * Primary Device Type
D/wpa_supplicant( 2613): WPS: * RF Bands (3)
D/wpa_supplicant( 2613): WPS: * Association State
D/wpa_supplicant( 2613): WPS: * Configuration Error (0)
D/wpa_supplicant( 2613): WPS: * Device Password ID (0)
D/wpa_supplicant( 2613): WPS: * Manufacturer
D/wpa_supplicant( 2613): WPS: * Model Name
D/wpa_supplicant( 2613): WPS: * Model Number
D/wpa_supplicant( 2613): WPS: * Device Name
D/wpa_supplicant( 2613): WPS: * Version2 (0x20)
D/wpa_supplicant( 2613): P2P: * P2P IE header
D/wpa_supplicant( 2613): P2P: * Capability dev=25 group=00
D/wpa_supplicant( 2613): P2P: * Listen Channel: Regulatory Class 81 Channel 6
D/wpa_supplicant( 2613): p2p-dev-wlan0: nl80211: scan request

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.

Jouni Malinen                                            PGP id EFC895FA

Hi Arend,

We've encountered this issue in the past, and resolved it by passing the wpa_supplicant a P2P specific configuration file using the -m option. Try using -m but do not populate it with any network blocks that are not P2P groups.

Hope this helps,

Ilan.

Thanks, Ilan

Got the hint from brcm colleague as well.

Regards,
Arend

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

Although the -m may work it feels somewhat awkward. My idea behind the P2P_DEVICE functionality was to have simpler command line with just the primary interface and a single configuration file. With that in mind I created a patch filtering the networks so they do not get enabled for the P2P_DEVICE interface. That seems to be working, but I will do some more testing with it.

Regards,
Arend