tests: Verify correct VLAN operation after reconnect

This adds a test case ap_vlan_reconnect. It connects, disconnects, and
reconnects a station in a VLAN. This tests for a regression with
wpa_group entering the FATAL_FAILURE state as the AP_VLAN interface is
removed before the group was stopped.

Signed-off-by: Michael Braun <michael-dev@fami-braun.de>

tests/hwsim/test_ap_vlan.py

@@ -609,3 +609,22 @@ def test_ap_vlan_wpa2_radius_mixed(dev, apdev):
     finally:
         subprocess.call(['ifconfig', ifname, 'down'])
         subprocess.call(['ip', 'link', 'del', ifname])
+
+def test_ap_vlan_reconnect(dev, apdev):
+    """AP VLAN with WPA2-PSK connect, disconnect, connect"""
+    params = hostapd.wpa2_params(ssid="test-vlan",
+                                 passphrase="12345678")
+    params['dynamic_vlan'] = "1";
+    params['accept_mac_file'] = "hostapd.accept";
+    hapd = hostapd.add_ap(apdev[0]['ifname'], params)
+
+    logger.info("connect sta")
+    dev[0].connect("test-vlan", psk="12345678", scan_freq="2412")
+    hwsim_utils.test_connectivity_iface(dev[0], hapd, "brvlan1")
+    logger.info("disconnect sta")
+    dev[0].request("REMOVE_NETWORK all")
+    dev[0].wait_disconnected(timeout=10)
+    time.sleep(1)
+    logger.info("reconnect sta")
+    dev[0].connect("test-vlan", psk="12345678", scan_freq="2412")
+    hwsim_utils.test_connectivity_iface(dev[0], hapd, "brvlan1")