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[nexus] migrate zero_len_external_route to nexus (#12930)
This commit migrates the test for zero-length external routes from a Python script to the Nexus test framework. The original test was test_zero_len_external_route.py in tests/scripts/thread-cert. The new Nexus test test_zero_len_external_route.cpp replicates the original test scenario: - Forms a network with a Leader and two Routers. - Verifies that adding a zero-length external route "::/0" on a Router allows routing to a manually added IPv6 address on that Router. - Verifies that explicit external routes are preferred over on-mesh prefixes that have the default route flag set. - Verifies that removing the external route causes traffic to be re-routed (and in this case, fail as intended when the destination is moved). - Verifies that moving the address to another Router with a default route flag allows successful routing. This commit also fixes a bug in Core::SendAndVerifyEchoRequest in nexus_core.cpp where the ICMP handler was not always unregistered, especially when failures occurred. This fix ensures that subsequent handler registrations in the same process do not fail with kErrorAlready. Migrating to Nexus provides faster execution and better integration with the core OpenThread codebase.
This commit is contained in:
Jonathan Hui
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#!/usr/bin/env python3
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#
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# Copyright (c) 2021, The OpenThread Authors.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 3. Neither the name of the copyright holder nor the
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# names of its contributors may be used to endorse or promote products
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# derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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import unittest
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import config
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import thread_cert
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# Test description:
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#
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# This test verifies the behavior of the network when a zero length external route prefix "::/0" is added.
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#
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# Topology:
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#
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# leader --- router1
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# \ /
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# \ /
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# router2
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#
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LEADER = 1
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ROUTER1 = 2
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ROUTER2 = 3
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class ZeroLengthExternalRoute(thread_cert.TestCase):
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USE_MESSAGE_FACTORY = False
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SUPPORT_NCP = False
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TOPOLOGY = {
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LEADER: {
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'name': 'LEADER',
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'mode': 'rdn',
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},
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ROUTER1: {
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'name': 'ROUTER2',
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'mode': 'rdn',
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},
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ROUTER2: {
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'name': 'ROUTER2',
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'mode': 'rdn',
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},
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}
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def test(self):
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leader = self.nodes[LEADER]
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router1 = self.nodes[ROUTER1]
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router2 = self.nodes[ROUTER2]
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# Start the nodes and form the network.
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leader.start()
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self.simulator.go(config.LEADER_STARTUP_DELAY)
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self.assertEqual(leader.get_state(), 'leader')
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router1.start()
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router2.start()
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self.simulator.go(config.ROUTER_STARTUP_DELAY)
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self.assertEqual(router1.get_state(), 'router')
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self.assertEqual(router2.get_state(), 'router')
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# Add an on-mesh prefix with SLAAC on router2 (without default
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# route flag).
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router2.add_prefix('fd00:1234::/64', 'paos')
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router2.register_netdata()
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# Add a zero length external route on router1. Also add an IPv6
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# address on router1.
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router1.add_route('::/0', stable=True)
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router1.add_ipaddr('fd00:abcd::1')
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router1.register_netdata()
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self.simulator.go(5)
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# Ping from leader the address added on router1. The zero
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# length external route should ensure the message is routed
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# to router1.
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self.assertTrue(leader.ping('fd00:abcd::1'))
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# Change the on-mesh prefix on router2 to now also have
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# the default route flag.
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router2.remove_prefix('fd00:1234::/64')
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router2.add_prefix('fd00:5678::/64', 'paros')
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router2.register_netdata()
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self.simulator.go(5)
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# Again ping from leader the same address. The explicit
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# external route (even with zero length) on router1 should
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# still be preferred over the default route flag of the
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# on-mesh prefix from router2.
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self.assertTrue(leader.ping('fd00:abcd::1'))
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# Remove the external route on router1.
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router1.remove_route("::/0")
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router1.register_netdata()
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self.simulator.go(5)
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# Now the ping should fail since the message would be routed
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# to router2 (due to its on-mesh prefix with default route
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# flag).
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self.assertFalse(leader.ping('fd00:abcd::1'))
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# Remove the address from router1 and add it on router2 and
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# ping it again from leader to verify that the message is
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# being routed to router2.
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router1.del_ipaddr('fd00:abcd::1')
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router2.add_ipaddr('fd00:abcd::1')
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self.simulator.go(5)
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self.assertTrue(leader.ping('fd00:abcd::1'))
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if __name__ == '__main__':
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unittest.main()
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