[PATCH v2 05/11] netdev: handle disconnect event during a connection

[James Prestwood <prestwoj@gmail.com>]

If a disconnect arrives at any point during the 4-way handshake or
key setting this would result in netdev sending a disconnect event
to station. If this is a reassociation this case is unhandled in
station and causes a hang as it expects any connection failure to
be handled via the reassociation callback, not a random disconnect
event.

To handle this case we can utilize netdev_disconnected() along with
the new NETDEV_RESULT_DISCONNECTED result to ensure the connect
callback gets called if it exists (indicating a pending connection)

Below are logs showing the "Unexpected disconnect event" which
prevents IWD from cleaning up its state and ultimately results in a
hang:

Jul 16 18:16:13: src/station.c:station_transition_reassociate()
Jul 16 18:16:13: event: state, old: connected, new: roaming
Jul 16 18:16:13: src/wiphy.c:wiphy_radio_work_done() Work item 65 done
Jul 16 18:16:13: src/wiphy.c:wiphy_radio_work_next() Starting work item 66
Jul 16 18:16:13: src/netdev.c:netdev_mlme_notify() MLME notification Del Station(20)
Jul 16 18:16:13: src/netdev.c:netdev_link_notify() event 16 on ifindex 6
Jul 16 18:16:13: src/netdev.c:netdev_mlme_notify() MLME notification Deauthenticate(39)
Jul 16 18:16:13: src/netdev.c:netdev_deauthenticate_event()
Jul 16 18:16:13: src/netdev.c:netdev_mlme_notify() MLME notification New Station(19)
Jul 16 18:16:13: src/station.c:station_netdev_event() Associating
Jul 16 18:16:13: src/netdev.c:netdev_mlme_notify() MLME notification Authenticate(37)
Jul 16 18:16:13: src/netdev.c:netdev_authenticate_event()
Jul 16 18:16:13: src/netdev.c:netdev_mlme_notify() MLME notification Associate(38)
Jul 16 18:16:13: src/netdev.c:netdev_associate_event()
Jul 16 18:16:13: src/netdev.c:netdev_link_notify() event 16 on ifindex 6
Jul 16 18:16:13: src/netdev.c:netdev_mlme_notify() MLME notification Connect(46)
Jul 16 18:16:13: src/netdev.c:netdev_connect_event()
Jul 16 18:16:13: src/netdev.c:netdev_connect_event() aborting and ignore_connect_event not set, proceed
Jul 16 18:16:13: src/netdev.c:netdev_connect_event() expect_connect_failure not set, proceed
Jul 16 18:16:13: src/netdev.c:parse_request_ies()
Jul 16 18:16:13: src/netdev.c:netdev_connect_event() Request / Response IEs parsed
Jul 16 18:16:13: src/netdev.c:netdev_get_oci()
Jul 16 18:16:13: src/netdev.c:netdev_link_notify() event 16 on ifindex 6
Jul 16 18:16:13: src/netdev.c:netdev_link_notify() event 16 on ifindex 6
Jul 16 18:16:13: src/netdev.c:netdev_link_notify() event 16 on ifindex 6
Jul 16 18:16:13: src/netdev.c:netdev_get_oci_cb() Obtained OCI: freq: 5220, width: 3, center1: 5210, center2: 0
Jul 16 18:16:13: src/eapol.c:eapol_start()
Jul 16 18:16:13: src/netdev.c:netdev_unicast_notify() Unicast notification Control Port Frame(129)
Jul 16 18:16:13: src/netdev.c:netdev_control_port_frame_event()
Jul 16 18:16:13: src/eapol.c:eapol_handle_ptk_1_of_4() ifindex=6
Jul 16 18:16:13: src/netdev.c:netdev_mlme_notify() MLME notification Control Port TX Status(139)
Jul 16 18:16:14: src/netdev.c:netdev_mlme_notify() MLME notification Notify CQM(64)
Jul 16 18:16:14: src/netdev.c:netdev_cqm_event() Signal change event (above=1 signal=-60)
Jul 16 18:16:17: src/netdev.c:netdev_link_notify() event 16 on ifindex 6
Jul 16 18:16:17: src/netdev.c:netdev_mlme_notify() MLME notification Del Station(20)
Jul 16 18:16:17: src/netdev.c:netdev_mlme_notify() MLME notification Deauthenticate(39)
Jul 16 18:16:17: src/netdev.c:netdev_deauthenticate_event()
Jul 16 18:16:17: src/netdev.c:netdev_mlme_notify() MLME notification Disconnect(48)
Jul 16 18:16:17: src/netdev.c:netdev_disconnect_event()
Jul 16 18:16:17: Received Deauthentication event, reason: 15, from_ap: true
Jul 16 18:16:17: src/wiphy.c:wiphy_radio_work_done() Work item 66 done
Jul 16 18:16:17: src/station.c:station_disconnect_event() 6
Jul 16 18:16:17: Unexpected disconnect event
Jul 16 18:16:17: src/netdev.c:netdev_link_notify() event 16 on ifindex 6
Jul 16 18:16:17: src/wiphy.c:wiphy_reg_notify() Notification of command Reg Change(36)
Jul 16 18:16:17: src/wiphy.c:wiphy_update_reg_domain() New reg domain country code for (global) is XX
---
 src/netdev.c | 19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

diff --git a/src/netdev.c b/src/netdev.c
index 153001ab..2d70fc38 100644
--- a/src/netdev.c
+++ b/src/netdev.c
@@ -1243,8 +1243,7 @@ static void netdev_disconnect_event(struct l_genl_msg *msg,
 	const void *data;
 	uint16_t reason_code = 0;
 	bool disconnect_by_ap = false;
-	netdev_event_func_t event_filter;
-	void *event_data;
+	enum netdev_event event;
 
 	l_debug("");
 
@@ -1282,19 +1281,11 @@ static void netdev_disconnect_event(struct l_genl_msg *msg,
 	l_info("Received Deauthentication event, reason: %hu, from_ap: %s",
 			reason_code, disconnect_by_ap ? "true" : "false");
 
-	event_filter = netdev->event_filter;
-	event_data = netdev->user_data;
-	netdev_connect_free(netdev);
+	event = disconnect_by_ap ? NETDEV_EVENT_DISCONNECT_BY_AP :
+				NETDEV_EVENT_DISCONNECT_BY_SME;
 
-	if (!event_filter)
-		return;
-
-	if (disconnect_by_ap)
-		event_filter(netdev, NETDEV_EVENT_DISCONNECT_BY_AP,
-						&reason_code, event_data);
-	else
-		event_filter(netdev, NETDEV_EVENT_DISCONNECT_BY_SME,
-						&reason_code, event_data);
+	netdev_disconnected(netdev, NETDEV_RESULT_DISCONNECTED,
+				event, reason_code);
 }
 
 static void netdev_cmd_disconnect_cb(struct l_genl_msg *msg, void *user_data)
-- 
2.34.1