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[nexus] migrate ipv6 fragmentation test (#12932)

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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
2026-04-20 23:26:02 -05:00
committed by GitHub
parent cd8e6776e8
commit 39b982c8d6
4 changed files with 105 additions and 84 deletions
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tests/scripts/thread-cert/test_ipv6_fragmentation.py
-84
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#!/usr/bin/env python3
#
# Copyright (c) 2019, 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 common
import config
import thread_cert
LEADER = 1
ROUTER = 2
class TestIPv6Fragmentation(thread_cert.TestCase):
SUPPORT_NCP = False
TOPOLOGY = {
LEADER: {
'mode': 'rdn',
'panid': 0xcafe,
'allowlist': [ROUTER]
},
ROUTER: {
'mode': 'rdn',
'panid': 0xcafe,
'allowlist': [LEADER]
},
}
def test(self):
self.nodes[LEADER].start()
self.simulator.go(config.LEADER_STARTUP_DELAY)
self.assertEqual(self.nodes[LEADER].get_state(), 'leader')
self.nodes[ROUTER].start()
self.simulator.go(config.ROUTER_STARTUP_DELAY)
self.assertEqual(self.nodes[ROUTER].get_state(), 'router')
mleid_leader = self.nodes[LEADER].get_ip6_address(config.ADDRESS_TYPE.ML_EID)
mleid_router = self.nodes[ROUTER].get_ip6_address(config.ADDRESS_TYPE.ML_EID)
self.nodes[LEADER].udp_start("::", common.UDP_TEST_PORT)
self.nodes[ROUTER].udp_start("::", common.UDP_TEST_PORT)
self.nodes[LEADER].udp_send(1952, mleid_router, common.UDP_TEST_PORT)
self.simulator.go(5)
self.nodes[ROUTER].udp_check_rx(1952)
self.nodes[ROUTER].udp_send(1831, mleid_leader, common.UDP_TEST_PORT)
self.simulator.go(5)
self.nodes[LEADER].udp_check_rx(1831)
self.nodes[ROUTER].udp_stop()
self.nodes[LEADER].udp_stop()
if __name__ == '__main__':
unittest.main()