P2P_GROUP_REMOVE in supplicant 2.4

Atul Joshi Atul.Joshi at csr.com
Fri Jun 12 02:16:46 EDT 2015


Hello,
I am facing an issue while removing the P2P group when we are a P2PGO.
As a part of a test, we send P2P_GROUP_REMOVE on the  interface on which P2P Group is created.
We can see from supplicant logs is
1434015304.517338: wlan1: Control interface command 'P2P_GROUP_REMOVE p2p-wlan1-0'
1434015304.517411: P2P-GROUP-REMOVED p2p-wlan1-0 GO reason=REQUESTED
1434015304.517461: CTRL_IFACE monitor sent successfully to /tmp/wpa_ctrl_7799-3\x00
1434015304.517476: P2P: Remove group interface p2p-wlan1-0
1434015304.517493: p2p-wlan1-0: Removing interface p2p-wlan1-0
1434015304.517521: p2p-wlan1-0: Request to deauthenticate - bssid=02:02:5b:00:30:74 pending_bssid=00:00:00:00:00:00 reason=3 state=COMPLETED
1434015304.517535: wpa_driver_nl80211_deauthenticate(addr=02:02:5b:00:30:74 reason_code=3)
1434015304.517636: p2p-wlan1-0: nl80211: MLME command failed: reason=3 ret=-95 (Operation not supported)


Here I can see that supplciant is calling NL80211_CMD_DEUTHETICATE to nl80211 driver. In cfg80211, it is accepted only if the interface is P2P_CLI or STA. but in our case it is P2PGO hence it fails. The results in we not sending deauth before going down as a group owner.
I could trace the functions and could not find out why it should not call  NL80211_CMD_DEUTHETICATE in P2PGO case

wpas_p2p_group_remove-> wpas_p2p_disconnect_safely-> wpas_p2p_disconnect-> wpas_p2p_group_delete-> wpa_supplicant_remove_iface-> wpa_supplicant_deinit_iface-> wpa_supplicant_deauthenticate


Am I missing something? Can somebody help me to understand why wpa_supplicant_deauthenticate is called which will bound to fail?

Thanks
atul


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