auto-t: add AP roam test for bad neighbor reports/candidate lists

autotests/testAPRoam/bad_neighbor_report_test.py

@@ -0,0 +1,156 @@
+#!/usr/bin/python3
+
+import unittest
+import sys
+
+sys.path.append('../util')
+import iwd
+from iwd import IWD
+from iwd import NetworkType
+
+from hostapd import HostapdCLI
+
+class Test(unittest.TestCase):
+    def initial_connection(self):
+        ordered_network = self.device.get_ordered_network('TestAPRoam')
+
+        self.assertEqual(ordered_network.type, NetworkType.psk)
+
+        condition = 'not obj.connected'
+        self.wd.wait_for_object_condition(ordered_network.network_object, condition)
+
+        self.device.connect_bssid(self.bss_hostapd[0].bssid)
+
+        condition = 'obj.state == DeviceState.connected'
+        self.wd.wait_for_object_condition(self.device, condition)
+
+        self.bss_hostapd[0].wait_for_event('AP-STA-CONNECTED')
+
+        self.assertFalse(self.bss_hostapd[1].list_sta())
+
+    def test_full_scan(self):
+        """
+            Tests that IWD first tries a limited scan, then a full scan after
+            an AP directed roam. After the full scan yields no results IWD
+            should stop trying to roam.
+        """
+        self.initial_connection()
+
+        # Disable other APs, so the scans come up empty
+        self.bss_hostapd[1].disable()
+        self.bss_hostapd[2].disable()
+
+        # Send a bad candidate list with the BSS TM request which contains a
+        # channel with no AP operating on it.
+        self.bss_hostapd[0].send_bss_transition(
+            self.device.address,
+            [(self.bss_hostapd[1].bssid, "8f0000005105060603000000")]
+        )
+        self.device.wait_for_event("roam-scan-triggered")
+        self.device.wait_for_event("no-roam-candidates")
+        # IWD should then trigger a full scan
+        self.device.wait_for_event("full-roam-scan")
+        self.device.wait_for_event("no-roam-candidates", timeout=30)
+
+        # IWD should not trigger a roam again after the above 2 failures.
+        with self.assertRaises(TimeoutError):
+            self.device.wait_for_event("roam-scan-triggered", timeout=60)
+
+    def test_bad_candidate_list(self):
+        """
+            Tests behavior when the AP sends a candidate list but the scan
+            finds no BSS's. IWD should fall back to a full scan after.
+        """
+        self.initial_connection()
+
+        # Send a bad candidate list with the BSS TM request which contains a
+        # channel with no AP operating on it.
+        self.bss_hostapd[0].send_bss_transition(
+            self.device.address,
+            [(self.bss_hostapd[1].bssid, "8f0000005105060603000000")]
+        )
+        self.device.wait_for_event("roam-scan-triggered")
+        self.device.wait_for_event("no-roam-candidates")
+        # IWD should then trigger a full scan
+        self.device.wait_for_event("full-roam-scan")
+        self.device.wait_for_event("roaming", timeout=30)
+        self.device.wait_for_event("connected")
+
+    def test_bad_neighbor_report(self):
+        """
+            Tests behavior when the AP sends no candidate list. IWD should
+            request a neighbor report. If the limited scan yields no BSS's IWD
+            should fall back to a full scan.
+        """
+
+        # Set a bad neighbor (channel that no AP is on) to force the limited
+        # roam scan to fail
+        self.bss_hostapd[0].set_neighbor(
+            self.bss_hostapd[1].bssid,
+            "TestAPRoam",
+            '%s8f000000%s%s060603000000' % (self.bss_hostapd[1].bssid.replace(':', ''), "51", "0b")
+        )
+
+        self.initial_connection()
+
+        self.bss_hostapd[0].send_bss_transition(self.device.address, [])
+        self.device.wait_for_event("roam-scan-triggered")
+        # The AP will have sent a neighbor report with a single BSS but on
+        # channel 11 which no AP is on. This should result in a limited scan
+        # picking up no candidates.
+        self.device.wait_for_event("no-roam-candidates", timeout=30)
+        # IWD should then trigger a full scan
+        self.device.wait_for_event("full-roam-scan")
+        self.device.wait_for_event("roaming", timeout=30)
+        self.device.wait_for_event("connected")
+
+    def test_ignore_candidate_list_quirk(self):
+        """
+            Tests that IWD ignores the candidate list sent by the AP since its
+            OUI indicates it should be ignored.
+        """
+
+        # Set the OUI so the candidate list should be ignored
+        for hapd in self.bss_hostapd:
+            hapd.set_value('vendor_elements', 'dd0400180a01')
+
+        self.initial_connection()
+
+        # Send with a candidate list (should be ignored)
+        self.bss_hostapd[0].send_bss_transition(
+            self.device.address,
+            [(self.bss_hostapd[1].bssid, "8f0000005105060603000000")]
+        )
+        # IWD should ignore the list and trigger a full scan since we have not
+        # set any neighbors
+        self.device.wait_for_event("full-roam-scan")
+        self.device.wait_for_event("roaming", timeout=30)
+        self.device.wait_for_event("connected")
+
+    def setUp(self):
+        self.wd = IWD(True)
+
+        devices = self.wd.list_devices(1)
+        self.device = devices[0]
+
+    def tearDown(self):
+        self.wd = None
+        self.device = None
+
+        for hapd in self.bss_hostapd:
+            hapd.reload()
+
+    @classmethod
+    def setUpClass(cls):
+        IWD.copy_to_storage('TestAPRoam.psk')
+
+        cls.bss_hostapd = [ HostapdCLI(config='ssid1.conf'),
+                            HostapdCLI(config='ssid2.conf'),
+                            HostapdCLI(config='ssid3.conf') ]
+
+    @classmethod
+    def tearDownClass(cls):
+        IWD.clear_storage()
+
+if __name__ == '__main__':
+    unittest.main(exit=True)