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[nexus] add MATN-TC-16 test case for large multicast subscriptions (#12705)

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This commit adds a new Nexus test case MATN-TC-16 to verify that the
Primary Backbone Border Router (BBR) can handle a large number of
multicast group subscriptions.

The test performs 75 multicast registrations in 5 batches of 15
addresses each. It verifies the following behavior:
- The BBR correctly processes Multicast Listener Registration (MLR)
  requests and returns a success status.
- Multicast packets sent to registered addresses on the backbone are
  successfully forwarded to the Thread network.
- Multicast packets sent to unregistered addresses are not forwarded.

To accommodate the requirements of this test, Nexus configuration
limits are increased:
- OPENTHREAD_CONFIG_IP6_MAX_EXT_MCAST_ADDRS is increased from 4 to 80.
- The mTestVars array in Nexus Core is increased from 16 to 128
  entries to support storing all multicast addresses for verification.

Included changes:
- New test files: test_1_2_MATN_TC_16.cpp and verify_1_2_MATN_TC_16.py.
- Registration of the test in CMakeLists.txt and run_nexus_tests.sh.
- Configuration updates in openthread-core-nexus-config.h and
  nexus_core.hpp.
This commit is contained in:
Jonathan Hui
2026-03-17 09:31:29 -05:00
committed by GitHub
parent 12aa812cf0
commit 7353a38871
6 changed files with 511 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
tests/nexus/CMakeLists.txt
+1
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@@ -244,6 +244,7 @@ ot_nexus_test(1_2_MATN_TC_9 "cert;nexus")
ot_nexus_test(1_2_MATN_TC_10 "cert;nexus")
ot_nexus_test(1_2_MATN_TC_12 "cert;nexus")
ot_nexus_test(1_2_MATN_TC_15 "cert;nexus")
ot_nexus_test(1_2_MATN_TC_16 "cert;nexus")
# Misc tests
ot_nexus_test(border_admitter "core;nexus")
tests/nexus/openthread-core-nexus-config.h
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@@ -75,7 +75,8 @@
#define OPENTHREAD_CONFIG_HEAP_EXTERNAL_ENABLE 1
#define OPENTHREAD_CONFIG_HISTORY_TRACKER_ENABLE 1
#define OPENTHREAD_CONFIG_IP6_BR_COUNTERS_ENABLE 1
#define OPENTHREAD_CONFIG_IP6_MAX_EXT_MCAST_ADDRS 4
#define OPENTHREAD_CONFIG_IP6_MAX_EXT_MCAST_ADDRS 80
#define OPENTHREAD_CONFIG_MAX_MULTICAST_LISTENERS 80
#define OPENTHREAD_CONFIG_IP6_MAX_EXT_UCAST_ADDRS 8
#define OPENTHREAD_CONFIG_IP6_SLAAC_ENABLE 1
#define OPENTHREAD_CONFIG_IP6_SLAAC_NUM_ADDRESSES 4
tests/nexus/platform/nexus_core.hpp
+1 -1
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@@ -129,7 +129,7 @@ private:
OwningList<Node> mNodes;
Pcap mPcap;
Array<NetworkKey, 16> mNetworkKeys;
Array<TestVar, 16> mTestVars;
Array<TestVar, 128> mTestVars;
uint16_t mCurNodeId;
bool mPendingAction;
uint64_t mNow;
tests/nexus/run_nexus_tests.sh
+1
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@@ -179,6 +179,7 @@ DEFAULT_TESTS=(
"1_2_MATN_TC_10"
"1_2_MATN_TC_12"
"1_2_MATN_TC_15"
"1_2_MATN_TC_16"
)
# Use provided arguments or the default test list
tests/nexus/test_1_2_MATN_TC_16.cpp
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@@ -0,0 +1,306 @@
/*
* Copyright (c) 2026, 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.
*/
#include <stdio.h>
#include "platform/nexus_core.hpp"
#include "platform/nexus_node.hpp"
namespace ot {
namespace Nexus {
/**
* Time to advance for a node to form a network and become leader, in milliseconds.
*/
static constexpr uint32_t kFormNetworkTime = 10 * 1000;
/**
* Time to advance for a node to join as a router, in milliseconds.
*/
static constexpr uint32_t kAttachToRouterTime = 200 * 1000;
/**
* Time to advance for the network to stabilize, in milliseconds.
*/
static constexpr uint32_t kStabilizationTime = 10 * 1000;
/**
* Time to advance for MLR registration, in milliseconds.
*/
static constexpr uint32_t kMlrRegistrationTime = 5 * 1000;
/**
* Time to advance for ICMPv6 Echo Reply, in milliseconds.
*/
static constexpr uint32_t kEchoReplyWaitTime = 5000;
/**
* ICMPv6 Echo Request payload size.
*/
static constexpr uint16_t kEchoPayloadSize = 10;
/**
* ICMPv6 Echo Request identifier.
*/
static constexpr uint16_t kEchoIdentifier = 0x1234;
/**
* Number of batches of multicast registrations.
*/
static constexpr uint8_t kNumBatches = 5;
/**
* Number of multicast addresses per registration request.
*/
static constexpr uint8_t kNumAddressesPerBatch = 15;
/**
* Total number of multicast addresses to subscribe.
*/
static constexpr uint8_t kTotalNumAddresses = kNumBatches * kNumAddressesPerBatch;
/**
* Multicast address MA2 which is not registered.
*/
static const char kMA2[] = "ff05::1234:777a:1";
void TestMatnTc16(void)
{
/**
* 5.10.12 MATN-TC-16: Large number of multicast group subscriptions to BBR
*
* 5.10.12.1 Topology
* - BR_1 (DUT)
* - Router
* - Host
*
* 5.10.12.2 Purpose & Description
* The purpose of this test case is to verify that the Primary BBR can handle a large number (75) of subscriptions
* to different multicast groups. Multicast registrations are performed each time with 15 multicast addresses
* per registration request.
*
* Spec Reference | V1.3.0 Section
* ---------------|---------------
* Multicast | 5.10.12
*/
Core nexus;
Node &br1 = nexus.CreateNode();
Node &router = nexus.CreateNode();
Node &host = nexus.CreateNode();
Ip6::Address mas[kTotalNumAddresses];
Ip6::Address ma2;
const Ip6::Address *hostUla;
br1.SetName("BR_1");
router.SetName("ROUTER");
host.SetName("HOST");
for (uint8_t i = 0; i < kTotalNumAddresses; i++)
{
char buf[OT_IP6_ADDRESS_STRING_SIZE];
snprintf(buf, sizeof(buf), "ff04::1234:777a:%x", i + 1);
SuccessOrQuit(mas[i].FromString(buf));
}
SuccessOrQuit(ma2.FromString(kMA2));
nexus.AdvanceTime(0);
Instance::SetLogLevel(kLogLevelNote);
/**
* Step 0
* - Device: N/A
* - Description: Topology formation – BR_1 (DUT), Router
* - Pass Criteria:
* - N/A
*/
Log("Step 0: Topology formation – BR_1 (DUT), Router");
br1.AllowList(router);
router.AllowList(br1);
br1.Form();
nexus.AdvanceTime(kFormNetworkTime);
VerifyOrQuit(br1.Get<Mle::Mle>().IsLeader());
br1.Get<BorderRouter::InfraIf>().Init(1, true);
br1.Get<BorderRouter::RoutingManager>().Init();
SuccessOrQuit(br1.Get<BorderRouter::RoutingManager>().SetEnabled(true));
br1.Get<BackboneRouter::Local>().SetEnabled(true);
router.Join(br1, Node::kAsFtd);
nexus.AdvanceTime(kAttachToRouterTime);
VerifyOrQuit(router.Get<Mle::Mle>().IsRouter());
nexus.AdvanceTime(kStabilizationTime);
VerifyOrQuit(br1.Get<BackboneRouter::Local>().IsPrimary());
hostUla = &host.mInfraIf.FindMatchingAddress("fd00::/8");
// Add multicast variables to test info manually to ensure verify script sees them.
for (uint8_t i = 0; i < kTotalNumAddresses; i++)
{
String<16> key;
key.Append("MAS%u", i);
nexus.AddTestVar(key.AsCString(), mas[i].ToString().AsCString());
}
nexus.AddTestVar("MA2", kMA2);
nexus.AddTestVar("HOST_BACKBONE_ULA", hostUla->ToString().AsCString());
for (uint8_t i = 1; i <= kNumBatches; i++)
{
/**
* Step 1
* - Device: Router
* - Description: Harness instructs the device to register for 15 multicast addresses, MASi. The device
* automatically unicasts an MLR.req CoAP request to the DUT (BR_1) as follows:
* coap://[<PBBR ALOC>]:MM/n/mr Where the payload contains: IPv6 Addresses TLV: MASi (15 addresses)
* - Pass Criteria:
* - N/A
*/
Log("Step 1: Router registers 15 multicast addresses, MASi.");
for (uint8_t j = 0; j < kNumAddressesPerBatch; j++)
{
uint8_t index = (i - 1) * kNumAddressesPerBatch + j;
SuccessOrQuit(router.Get<Ip6::Netif>().SubscribeExternalMulticast(mas[index]));
}
/**
* Step 2
* - Device: BR_1 (DUT)
* - Description: Automatically responds to the multicast registration.
* - Pass Criteria:
* - The DUT MUST unicast an MLR.rsp CoAP response to Router_1 as follows: 2.04 changed
* - Where the payload contains: Status TLV: 0 [ST_MLR_SUCCESS]
*/
Log("Step 2: BR_1 (DUT) automatically responds to the multicast registration.");
/**
* Step 3
* - Device: BR_1 (DUT)
* - Description: Auotmatically informs any other BBRs on the network of the multicast registrations.
* - Pass Criteria:
* - The DUT MUST multicast a BMLR.ntf CoAP request to the Backbone Link, as follows:
* coap://[<All network BBRs multicast>]:BB/b/bmr
* - Where the payload contains: IPv6 Addresses TLV: MASi (15 addresses)
* - Timeout TLV: default MLR timeout of BR_1
*/
Log("Step 3: BR_1 (DUT) automatically informs any other BBRs on the network of the multicast registrations.");
// Checks for BLMR.ntf (BMLR.ntf) are intentionally skipped.
/**
* Step 4
* - Device: BR_1 (DUT)
* - Description: Automatically multicasts an MLDv2 message. The MLDv2 message may also be sent as multiple
* MLDv2 messages with content distributed across these multiple messages.
* - Pass Criteria:
* - The DUT MUST multicast an MLDv2 message of type “Version 2 Multicast Listener Report” (see [RFC 3810]
* Section 5.2).
* - Where: Nr of Mcast Address Records (M): >= 15
* - Multicast Address Record [j]: See below
* - Each of the j := 0 … 14 Multicast Address Record containing an address of the set MASi contains the
* following: Record Type: 4 (CHANGE_TO_EXCLUDE_MODE), Number of Sources (N): 0, Multicast Address: MASi[j]
* - Alternatively, the DUT MAY also send multiple of above messages each with a portion of the 15
* addresses MASi. In this case the Nr of Mcast Address Records can be < 15 but the sum over all messages
* MUST be >= 15.
*/
Log("Step 4: BR_1 (DUT) automatically multicasts an MLDv2 message.");
// Checks for MLDv2 are intentionally skipped.
nexus.AdvanceTime(kMlrRegistrationTime);
}
for (uint8_t i = 1; i <= kNumBatches; i++)
{
/**
* Step 5
* - Device: Host
* - Description: Harness instructs the device to send an ICMPv6 Echo (ping) Request packet to the multicast
* address, MASi[ 3 * i - 1], on the backbone link.
* - Pass Criteria:
* - N/A
*/
Log("Step 5: Host sends an ICMPv6 Echo (ping) Request packet to the multicast address, MASi[ 3 * i - 1].");
uint8_t index = (i - 1) * kNumAddressesPerBatch + (3 * i - 1);
host.mInfraIf.SendEchoRequest(*hostUla, mas[index], kEchoIdentifier, kEchoPayloadSize);
nexus.AdvanceTime(100);
/**
* Step 6
* - Device: BR_1 (DUT)
* - Description: Automatically forwards the ping request packet to its Thread Network.
* - Pass Criteria:
* - The DUT MUST forward the ICMPv6 Echo (ping) Rquest packet of the previous step to its Thread Network
* encapsulated in an MPL packet, where:
* - MPL Option: If Source outer IP header == BR_1 RLOC Then S == 0 Else S == 1 and seed-id == BR_1 RLOC16
*/
Log("Step 6: BR_1 (DUT) automatically forwards the ping request packet to its Thread Network.");
nexus.AdvanceTime(kEchoReplyWaitTime);
}
/**
* Step 7
* - Device: Host
* - Description: Harness instructs the device to multicast a packet to the multicast addresses, MA2.
* - Pass Criteria:
* - N/A
*/
Log("Step 7: Host multicasts a packet to the multicast addresses, MA2.");
host.mInfraIf.SendEchoRequest(*hostUla, ma2, kEchoIdentifier, kEchoPayloadSize);
nexus.AdvanceTime(100);
/**
* Step 8
* - Device: BR_1 (DUT)
* - Description: Does not forward the packet to its Thread Network.
* - Pass Criteria:
* - The DUT MUST NOT forward the packet with multicast address, MA2, to the Thread Network.
*/
Log("Step 8: BR_1 (DUT) does not forward the packet to its Thread Network.");
nexus.AdvanceTime(kEchoReplyWaitTime);
nexus.SaveTestInfo("test_1_2_MATN_TC_16.json");
}
} // namespace Nexus
} // namespace ot
int main(void)
{
ot::Nexus::TestMatnTc16();
printf("All tests passed\n");
return 0;
}
tests/nexus/verify_1_2_MATN_TC_16.py
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@@ -0,0 +1,200 @@
#!/usr/bin/env python3
#
# Copyright (c) 2026, 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 sys
import os
import struct
# Add the current directory to sys.path to find verify_utils
CUR_DIR = os.path.dirname(os.path.abspath(__file__))
sys.path.append(CUR_DIR)
import verify_utils
from pktverify.addrs import Ipv6Addr
from pktverify.bytes import Bytes
def verify(pv):
# 5.10.12 MATN-TC-16: Large number of multicast group subscriptions to BBR
#
# 5.10.12.1 Topology
# - BR_1 (DUT)
# - Router
# - Host
#
# 5.10.12.2 Purpose & Description
# The purpose of this test case is to verify that the Primary BBR can handle a large number (75) of subscriptions
# to different multicast groups. Multicast registrations are performed each time with 15 multicast addresses
# per registration request.
#
# Spec Reference | V1.3.0 Section
# ---------------|---------------
# Multicast | 5.10.12
pkts = pv.pkts
pv.summary.show()
BR_1 = pv.vars['BR_1']
BR_1_RLOC = pv.vars['BR_1_RLOC']
BR_1_RLOC16 = pv.vars['BR_1_RLOC16']
ROUTER = pv.vars['ROUTER']
MA2 = Ipv6Addr(pv.vars['MA2'])
NUM_BATCHES = 5
NUM_ADDRESSES_PER_BATCH = 15
MLR_URI = '/n/mr'
ST_MLR_SUCCESS = 0
# Step 0
# - Device: N/A
# - Description: Topology formation – BR_1 (DUT), Router
# - Pass Criteria:
# - N/A
print("Step 0: Topology formation – BR_1 (DUT), Router")
for i in range(1, NUM_BATCHES + 1):
mas_i = [
Ipv6Addr(pv.vars['MAS%d' % ((i - 1) * NUM_ADDRESSES_PER_BATCH + j)])
for j in range(NUM_ADDRESSES_PER_BATCH)
]
# Step 1
# - Device: Router
# - Description: Harness instructs the device to register for 15 multicast addresses, MASi. The device
# automatically unicasts an MLR.req CoAP request to the DUT (BR_1) as follows:
# coap://[<PBBR ALOC>]:MM/n/mr Where the payload contains: IPv6 Addresses TLV: MASi (15 addresses)
# - Pass Criteria:
# - N/A
print("Step 1: Router registers 15 multicast addresses, MASi.")
pkts.filter_wpan_src64(ROUTER).\
filter_coap_request(MLR_URI).\
filter(lambda p: all(addr in p.coap.tlv.ipv6_address for addr in mas_i)).\
must_next()
# Step 2
# - Device: BR_1 (DUT)
# - Description: Automatically responds to the multicast registration.
# - Pass Criteria:
# - The DUT MUST unicast an MLR.rsp CoAP response to Router_1 as follows: 2.04 changed
# - Where the payload contains: Status TLV: 0 [ST_MLR_SUCCESS]
print("Step 2: BR_1 (DUT) automatically responds to the multicast registration.")
pkts.filter_wpan_src64(BR_1).\
filter_coap_ack(MLR_URI).\
filter(lambda p: p.coap.tlv.status == ST_MLR_SUCCESS).\
must_next()
# Step 3
# - Device: BR_1 (DUT)
# - Description: Auotmatically informs any other BBRs on the network of the multicast registrations.
# - Pass Criteria:
# - The DUT MUST multicast a BMLR.ntf CoAP request to the Backbone Link, as follows:
# coap://[<All network BBRs multicast>]:BB/b/bmr
# - Where the payload contains: IPv6 Addresses TLV: MASi (15 addresses)
# - Timeout TLV: default MLR timeout of BR_1
print("Step 3: BR_1 (DUT) automatically informs any other BBRs on the network of the multicast registrations.")
# Checks for BLMR.ntf (BMLR.ntf) are intentionally skipped.
# Step 4
# - Device: BR_1 (DUT)
# - Description: Automatically multicasts an MLDv2 message. The MLDv2 message may also be sent as multiple
# MLDv2 messages with content distributed across these multiple messages.
# - Pass Criteria:
# - The DUT MUST multicast an MLDv2 message of type “Version 2 Multicast Listener Report” (see [RFC 3810]
# Section 5.2).
# - Where: Nr of Mcast Address Records (M): >= 15
# - Multicast Address Record [j]: See below
# - Each of the j := 0 … 14 Multicast Address Record containing an address of the set MASi contains the
# following: Record Type: 4 (CHANGE_TO_EXCLUDE_MODE), Number of Sources (N): 0, Multicast Address: MASi[j]
# - Alternatively, the DUT MAY also send multiple of above messages each with a portion of the 15
# addresses MASi. In this case the Nr of Mcast Address Records can be < 15 but the sum over all messages
# MUST be >= 15.
print("Step 4: BR_1 (DUT) automatically multicasts an MLDv2 message.")
# Checks for MLDv2 are intentionally skipped.
for i in range(1, NUM_BATCHES + 1):
mas_i_j = Ipv6Addr(pv.vars['MAS%d' % ((i - 1) * NUM_ADDRESSES_PER_BATCH + (3 * i - 1))])
# Step 5
# - Device: Host
# - Description: Harness instructs the device to send an ICMPv6 Echo (ping) Request packet to the multicast
# address, MASi[ 3 * i - 1], on the backbone link.
# - Pass Criteria:
# - N/A
print("Step 5: Host sends an ICMPv6 Echo (ping) Request packet to the multicast address, MASi[ 3 * i - 1].")
pkts.filter_ping_request().\
filter_ipv6_dst(mas_i_j).\
must_next()
# Step 6
# - Device: BR_1 (DUT)
# - Description: Automatically forwards the ping request packet to its Thread Network.
# - Pass Criteria:
# - The DUT MUST forward the ICMPv6 Echo (ping) Rquest packet of the previous step to its Thread Network
# encapsulated in an MPL packet, where:
# - MPL Option: If Source outer IP header == BR_1 RLOC Then S == 0 Else S == 1 and seed-id == BR_1 RLOC16
print("Step 6: BR_1 (DUT) automatically forwards the ping request packet to its Thread Network.")
def check_step6(p):
if p.ipv6.src == BR_1_RLOC:
return p.ipv6.opt.mpl.flag.s == 0
else:
return p.ipv6.opt.mpl.flag.s == 1 and \
p.ipv6.opt.mpl.seed_id == Bytes(struct.pack('>H', BR_1_RLOC16))
pkts.filter_wpan_src64(BR_1).\
filter_ping_request().\
filter(lambda p: p.ipv6.dst == 'ff03::fc' or p.ipv6.dst == mas_i_j).\
filter(check_step6).\
must_next()
# Step 7
# - Device: Host
# - Description: Harness instructs the device to multicast a packet to the multicast addresses, MA2.
# - Pass Criteria:
# - N/A
print("Step 7: Host multicasts a packet to the multicast addresses, MA2.")
pkts.filter_ping_request().\
filter_ipv6_dst(MA2).\
must_next()
# Step 8
# - Device: BR_1 (DUT)
# - Description: Does not forward the packet to its Thread Network.
# - Pass Criteria:
# - The DUT MUST NOT forward the packet with multicast address, MA2, to the Thread Network.
print("Step 8: BR_1 (DUT) does not forward the packet to its Thread Network.")
pkts.copy().\
filter_wpan_src64(BR_1).\
filter_ping_request().\
filter(lambda p: p.ipv6.dst == 'ff03::fc' or p.ipv6.dst == MA2).\
must_not_next()
if __name__ == '__main__':
verify_utils.run_main(verify)