auto-t: add test for channel switch during roam

In kernel 6.8 a new CMD_ASSOCIATE failure path was added which checks
if the AP has a channel switch in progress. Eariler patches update
IWD into handling this case better, and this new test exercises that.

autotests/testPSK-roam/chan_switch_test.py

@@ -0,0 +1,114 @@
+#! /usr/bin/python3
+
+import unittest
+import sys, os
+
+sys.path.append('../util')
+from iwd import IWD
+from iwd import NetworkType
+from hostapd import HostapdCLI
+from packaging import version
+from subprocess import run
+import re
+import testutil
+
+#
+# The CSA handling was added in kernel 6.8, so for any earlier kernel this test
+# won't pass.
+#
+def kernel_is_newer(min_version="6.8"):
+    proc = run(["uname",  "-r"], capture_output=True)
+
+    version_str = proc.stdout.decode("utf-8")
+    match = re.match(r"(\d+\.\d+)", version_str)
+    if not match:
+        return False
+
+    return version.parse(match.group(1)) >= version.parse(min_version)
+
+class Test(unittest.TestCase):
+    def test_channel_switch_during_roam(self):
+        wd = self.wd
+
+        device = wd.list_devices(1)[0]
+
+        ordered_network = device.get_ordered_network('TestFT', full_scan=True)
+
+        self.assertEqual(ordered_network.type, NetworkType.psk)
+
+        condition = 'not obj.connected'
+        wd.wait_for_object_condition(ordered_network.network_object, condition)
+
+        self.assertFalse(self.bss_hostapd[0].list_sta())
+        self.assertFalse(self.bss_hostapd[1].list_sta())
+
+        device.connect_bssid(self.bss_hostapd[0].bssid)
+
+        condition = 'obj.state == DeviceState.connected'
+        wd.wait_for_object_condition(device, condition)
+
+        self.bss_hostapd[0].wait_for_event('AP-STA-CONNECTED %s' % device.address)
+
+        testutil.test_iface_operstate(device.name)
+        testutil.test_ifaces_connected(self.bss_hostapd[0].ifname, device.name)
+        self.assertRaises(Exception, testutil.test_ifaces_connected,
+                          (self.bss_hostapd[1].ifname, device.name, True, True))
+
+        # Start a channel switch and wait for it to begin
+        self.bss_hostapd[1].chan_switch(6, wait=False)
+        self.bss_hostapd[1].wait_for_event("CTRL-EVENT-STARTED-CHANNEL-SWITCH")
+        # Initiate a roam immediately which should get rejected by the kernel
+        device.roam(self.bss_hostapd[1].bssid)
+
+        # IWD should authenticate, then proceed to association
+        device.wait_for_event("ft-authenticating")
+        device.wait_for_event("ft-roaming")
+
+        # The kernel should reject the association, which should trigger a
+        # disconnect
+        condition = 'obj.state == DeviceState.disconnected'
+        wd.wait_for_object_condition(device, condition)
+
+        condition = 'obj.state == DeviceState.connected'
+        wd.wait_for_object_condition(device, condition)
+
+
+    def tearDown(self):
+        os.system('ip link set "' + self.bss_hostapd[0].ifname + '" down')
+        os.system('ip link set "' + self.bss_hostapd[1].ifname + '" down')
+        os.system('ip link set "' + self.bss_hostapd[0].ifname + '" up')
+        os.system('ip link set "' + self.bss_hostapd[1].ifname + '" up')
+
+        for hapd in self.bss_hostapd:
+            hapd.default()
+
+        self.wd.stop()
+        self.wd = None
+
+    def setUp(self):
+        self.wd = IWD(True)
+
+    @classmethod
+    def setUpClass(cls):
+        if not kernel_is_newer():
+            raise unittest.SkipTest()
+
+        IWD.copy_to_storage('TestFT.psk')
+
+        cls.bss_hostapd = [ HostapdCLI(config='ft-psk-ccmp-1.conf'),
+                            HostapdCLI(config='ft-psk-ccmp-2.conf'),
+                            HostapdCLI(config='ft-psk-ccmp-3.conf') ]
+
+        unused = HostapdCLI(config='ft-psk-ccmp-3.conf')
+        unused.disable()
+
+        cls.bss_hostapd[0].set_address('12:00:00:00:00:01')
+        cls.bss_hostapd[1].set_address('12:00:00:00:00:02')
+        cls.bss_hostapd[2].set_address('12:00:00:00:00:03')
+
+        HostapdCLI.group_neighbors(*cls.bss_hostapd)
+
+    @classmethod
+    def tearDownClass(cls):
+        IWD.clear_storage()
+        cls.bss_hostapd = None