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[dhcp6] obsolete DHCPv6 Server Unicast Option per RFC 9915 (#13146)

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This commit updates the DHCPv6 Prefix Delegation (PD) client to
comply with RFC 9915, which obsoletes the Server Unicast option
(Option 12) and the UseMulticast status code.

Changes:
- Removed `mServerAddress` and `ProcessServerUnicastOption()` from
  `Dhcp6PdClient`.
- Modified `Dhcp6PdClient::SendMessage` to always transmit via
  multicast to `ff02::1:2`.
- Removed `UseMulticast` status code handling in `HandleReply()`.
- Added `otMessageFree` weak stub in simulation platform's
  `infra_if.c` to resolve linking errors on simulation radio-only
  targets when DHCPv6 PD client is enabled.
- Updated `test_dhcp6_pd_client.cpp` to expect multicast and
  removed the obsolete UseMulticast test case.
This commit is contained in:
Jonathan Hui
2026-05-27 10:31:00 -07:00
committed by GitHub
parent 494a4868a3
commit dcbd870245
5 changed files with 75 additions and 333 deletions
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examples/platforms/simulation/infra_if.c
+7
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@@ -363,4 +363,11 @@ OT_TOOL_WEAK void otPlatInfraIfRecvIcmp6Nd(otInstance *aInstance,
DieNow(OT_EXIT_FAILURE);
}
OT_TOOL_WEAK void otMessageFree(otMessage *aMessage)
{
OT_UNUSED_VARIABLE(aMessage);
fprintf(stderr, "\n\rWeak otMessageFree() is incorrectly used\n\r");
DieNow(OT_EXIT_FAILURE);
}
#endif // OPENTHREAD_SIMULATION_IMPLEMENT_INFRA_IF && OPENTHREAD_CONFIG_BORDER_ROUTING_ENABLE