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[nexus] migrate ipv6 fragmentation test (#12932)
This commit migrates the `test_ipv6_fragmentation.py` cert test to the Nexus simulation framework. To support this migration, the Nexus core configuration was updated to enable IPv6 fragmentation (`OPENTHREAD_CONFIG_IP6_FRAGMENTATION_ENABLE`). The new Nexus test `test_ipv6_fragmentation.cpp` covers the validation of IPv6 fragmentation and reassembly. It sends large ICMPv6 Echo Requests exceeding the 1280-byte MTU between a Leader and a Router: - 1952 bytes payload from Leader to Router - 1831 bytes payload from Router to Leader The original Python test script is removed as its functionality is now fully covered by the new Nexus test.
This commit is contained in:
Jonathan Hui
@@ -394,6 +394,7 @@ ot_nexus_test(discover_scan "core;nexus")
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ot_nexus_test(dns_client_config_auto_start "core;nexus")
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ot_nexus_test(dtls "core;nexus")
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ot_nexus_test(form_join "core;nexus")
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ot_nexus_test(ipv6_fragmentation "core;nexus")
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ot_nexus_test(ipv6_source_selection "core;nexus")
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ot_nexus_test(key_rotation_guard_time "core;nexus")
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ot_nexus_test(log_override "core;nexus")
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@@ -81,6 +81,7 @@
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#define OPENTHREAD_CONFIG_IP6_MAX_EXT_MCAST_ADDRS 80
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#define OPENTHREAD_CONFIG_MAX_MULTICAST_LISTENERS 80
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#define OPENTHREAD_CONFIG_IP6_MAX_EXT_UCAST_ADDRS 8
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#define OPENTHREAD_CONFIG_IP6_FRAGMENTATION_ENABLE 1
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#define OPENTHREAD_CONFIG_IP6_SLAAC_ENABLE 1
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#define OPENTHREAD_CONFIG_IP6_SLAAC_NUM_ADDRESSES 4
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#define OPENTHREAD_CONFIG_JAM_DETECTION_ENABLE 1
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@@ -0,0 +1,103 @@
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/*
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* Copyright (c) 2026, 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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#include <stdio.h>
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#include "platform/nexus_core.hpp"
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#include "platform/nexus_node.hpp"
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namespace ot {
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namespace Nexus {
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/** Time to advance for a node to form a network and become leader, in milliseconds. */
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static constexpr uint32_t kFormNetworkTime = 13 * 1000;
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/** Time to advance for a node to join as a child and upgrade to a router, in milliseconds. */
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static constexpr uint32_t kAttachToRouterTime = 200 * 1000;
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/** Time to wait for ICMPv6 Echo response, in milliseconds. */
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static constexpr uint32_t kEchoTimeout = 10 * 1000;
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void TestIPv6Fragmentation(void)
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{
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/**
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* Test IPv6 Fragmentation
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*
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* Topology:
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* - Leader
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* - Router
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*
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* Description:
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* The purpose of this test case is to validate IPv6 fragmentation and reassembly.
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* Large ICMPv6 Echo Requests (exceeding 1280 bytes MTU) are sent between nodes.
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*/
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Core nexus;
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Node &leader = nexus.CreateNode();
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Node &router = nexus.CreateNode();
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leader.SetName("LEADER");
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router.SetName("ROUTER");
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SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
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Log("Step 1: Form network");
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AllowLinkBetween(leader, router);
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leader.Form();
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nexus.AdvanceTime(kFormNetworkTime);
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VerifyOrQuit(leader.Get<Mle::Mle>().IsLeader());
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router.Join(leader);
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nexus.AdvanceTime(kAttachToRouterTime);
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VerifyOrQuit(router.Get<Mle::Mle>().IsRouter());
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Log("Step 2: Large Echo Request from Leader to Router (1952 bytes payload)");
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// 1952 bytes payload + 8 bytes ICMP header + 40 bytes IPv6 header = 2000 bytes.
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// This exceeds the 1280 bytes MTU and triggers IPv6 fragmentation.
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nexus.SendAndVerifyEchoRequest(leader, router.Get<Mle::Mle>().GetMeshLocalEid(), 1952, 64, kEchoTimeout);
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Log("Step 3: Large Echo Request from Router to Leader (1831 bytes payload)");
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// 1831 bytes payload + 8 bytes ICMP header + 40 bytes IPv6 header = 1879 bytes.
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// This exceeds the 1280 bytes MTU and triggers IPv6 fragmentation.
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nexus.SendAndVerifyEchoRequest(router, leader.Get<Mle::Mle>().GetMeshLocalEid(), 1831, 64, kEchoTimeout);
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nexus.SaveTestInfo("test_ipv6_fragmentation.json");
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}
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} // namespace Nexus
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} // namespace ot
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int main(void)
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{
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ot::Nexus::TestIPv6Fragmentation();
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printf("All tests passed\n");
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return 0;
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}
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@@ -1,84 +0,0 @@
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#!/usr/bin/env python3
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#
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# Copyright (c) 2019, 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 common
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import config
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import thread_cert
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LEADER = 1
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ROUTER = 2
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class TestIPv6Fragmentation(thread_cert.TestCase):
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SUPPORT_NCP = False
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TOPOLOGY = {
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LEADER: {
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'mode': 'rdn',
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'panid': 0xcafe,
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'allowlist': [ROUTER]
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},
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ROUTER: {
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'mode': 'rdn',
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'panid': 0xcafe,
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'allowlist': [LEADER]
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},
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}
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def test(self):
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self.nodes[LEADER].start()
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self.simulator.go(config.LEADER_STARTUP_DELAY)
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self.assertEqual(self.nodes[LEADER].get_state(), 'leader')
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self.nodes[ROUTER].start()
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self.simulator.go(config.ROUTER_STARTUP_DELAY)
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self.assertEqual(self.nodes[ROUTER].get_state(), 'router')
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mleid_leader = self.nodes[LEADER].get_ip6_address(config.ADDRESS_TYPE.ML_EID)
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mleid_router = self.nodes[ROUTER].get_ip6_address(config.ADDRESS_TYPE.ML_EID)
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self.nodes[LEADER].udp_start("::", common.UDP_TEST_PORT)
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self.nodes[ROUTER].udp_start("::", common.UDP_TEST_PORT)
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self.nodes[LEADER].udp_send(1952, mleid_router, common.UDP_TEST_PORT)
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self.simulator.go(5)
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self.nodes[ROUTER].udp_check_rx(1952)
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self.nodes[ROUTER].udp_send(1831, mleid_leader, common.UDP_TEST_PORT)
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self.simulator.go(5)
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self.nodes[LEADER].udp_check_rx(1831)
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self.nodes[ROUTER].udp_stop()
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self.nodes[LEADER].udp_stop()
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if __name__ == '__main__':
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unittest.main()
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