[ip6] set Mesh Local IID for Reference Devices (#6599)

tests/scripts/thread-cert/node.py

@@ -2622,6 +2622,11 @@ class NodeImpl:
 
         return result
 
+    def set_mliid(self, mliid: str):
+        cmd = f'mliid {mliid}'
+        self.send_command(cmd)
+        self._expect_command_output(cmd)
+
 
 class Node(NodeImpl, OtCli):
     pass

tests/scripts/thread-cert/test_set_mliid.py

@@ -0,0 +1,75 @@
+#!/usr/bin/env python3
+#
+#  Copyright (c) 2021, The OpenThread Authors.
+#  All rights reserved.
+#
+#  Redistribution and use in source and binary forms, with or without
+#  modification, are permitted provided that the following conditions are met:
+#  1. Redistributions of source code must retain the above copyright
+#     notice, this list of conditions and the following disclaimer.
+#  2. Redistributions in binary form must reproduce the above copyright
+#     notice, this list of conditions and the following disclaimer in the
+#     documentation and/or other materials provided with the distribution.
+#  3. Neither the name of the copyright holder nor the
+#     names of its contributors may be used to endorse or promote products
+#     derived from this software without specific prior written permission.
+#
+#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+#  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+#  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+#  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+#  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+#  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+#  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+#  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+#  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+#  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+#  POSSIBILITY OF SUCH DAMAGE.
+#
+
+import unittest
+import ipaddress
+
+import config
+import thread_cert
+
+LEADER = 1
+
+
+class Test_SetMlIid(thread_cert.TestCase):
+    USE_MESSAGE_FACTORY = False
+
+    TOPOLOGY = {
+        LEADER: {
+            'mode': 'rdn',
+        },
+    }
+
+    def test(self):
+        # Set ML-IID before Thread is enabled.
+        self.nodes[LEADER].set_mliid('1122334455667788')
+
+        self.nodes[LEADER].start()
+        self.simulator.go(4)
+        self.assertEqual(self.nodes[LEADER].get_state(), 'leader')
+
+        # Ensure set ML-IID was effective.
+        mleid = self.nodes[LEADER].get_ip6_address(config.ADDRESS_TYPE.ML_EID)
+        self.assertEqual(b'\x11\x22\x33\x44\x55\x66\x77\x88', ipaddress.IPv6Address(mleid).packed[-8:])
+
+        # Ensure set ML-IID fail after Thread is enabled.
+        self.assertRaises(Exception, lambda: self.nodes[LEADER].set_mliid('5566778811223344'))
+
+        self.nodes[LEADER].reset()
+
+        self.nodes[LEADER].start()
+        self.simulator.go(10)
+        self.assertEqual(self.nodes[LEADER].get_state(), 'leader')
+
+        # Ensure ML-IID is persistent after reset.
+        mleid = self.nodes[LEADER].get_ip6_address(config.ADDRESS_TYPE.ML_EID)
+        self.assertEqual(b'\x11\x22\x33\x44\x55\x66\x77\x88', ipaddress.IPv6Address(mleid).packed[-8:])
+
+
+if __name__ == '__main__':
+    unittest.main()