From d5fdc0d9502de06e2a30e21c9b540acac5f63a95 Mon Sep 17 00:00:00 2001
From: Song GUO <songguo@google.com>
Date: Wed, 28 Jun 2023 05:15:28 +0800
Subject: [PATCH] [dhcp6pd] add basic DHCPv6-PD support (#1917)

This commit includes changes for build flags and feature flags.
---
 etc/cmake/options.cmake               | 7 +++++++
 src/ncp/ncp_openthread.cpp            | 7 +++++++
 src/proto/capabilities.proto          | 1 +
 src/proto/feature_flag.proto          | 2 ++
 third_party/openthread/CMakeLists.txt | 1 +
 5 files changed, 18 insertions(+)

diff --git a/etc/cmake/options.cmake b/etc/cmake/options.cmake
index d8a65915242..9060bbb415d 100644
--- a/etc/cmake/options.cmake
+++ b/etc/cmake/options.cmake
@@ -139,3 +139,10 @@ option(OTBR_PUBLISH_MESHCOP_BA_ID "Publish the MeshCoP mDNS 'id' TXT entry, enab
 if (OTBR_PUBLISH_MESHCOP_BA_ID)
     target_compile_definitions(otbr-config INTERFACE OTBR_ENABLE_PUBLISH_MESHCOP_BA_ID=1)
 endif()
+
+option(OTBR_DHCP6_PD "Prefix delegation support" OFF)
+if (OTBR_DHCP6_PD)
+    target_compile_definitions(otbr-config INTERFACE OTBR_ENABLE_DHCP6_PD=1)
+else()
+    target_compile_definitions(otbr-config INTERFACE OTBR_ENABLE_DHCP6_PD=0)
+endif()
diff --git a/src/ncp/ncp_openthread.cpp b/src/ncp/ncp_openthread.cpp
index 0f4302c28d0..ef1627e6971 100644
--- a/src/ncp/ncp_openthread.cpp
+++ b/src/ncp/ncp_openthread.cpp
@@ -35,6 +35,7 @@
 #include <string.h>
 
 #include <openthread/backbone_router_ftd.h>
+#include <openthread/border_routing.h>
 #include <openthread/dataset.h>
 #include <openthread/dnssd_server.h>
 #include <openthread/logging.h>
@@ -243,6 +244,9 @@ void ControllerOpenThread::Init(void)
 #if OTBR_ENABLE_DNS_UPSTREAM_QUERY
     otDnssdUpstreamQuerySetEnabled(mInstance, /* aEnabled */ true);
 #endif
+#if OTBR_ENABLE_DHCP6_PD
+    otBorderRoutingDhcp6PdSetEnabled(mInstance, /* aEnabled */ true);
+#endif
 #endif // OTBR_ENABLE_FEATURE_FLAGS
 
     mThreadHelper = std::unique_ptr<otbr::agent::ThreadHelper>(new otbr::agent::ThreadHelper(mInstance, this));
@@ -277,6 +281,9 @@ otError ControllerOpenThread::ApplyFeatureFlagList(const FeatureFlagList &aFeatu
 #if OTBR_ENABLE_DNS_UPSTREAM_QUERY
     otDnssdUpstreamQuerySetEnabled(mInstance, aFeatureFlagList.enable_dns_upstream_query());
 #endif
+#if OTBR_ENABLE_DHCP6_PD
+    otBorderRoutingDhcp6PdSetEnabled(mInstance, aFeatureFlagList.enable_dhcp6_pd());
+#endif
 
     return error;
 }
diff --git a/src/proto/capabilities.proto b/src/proto/capabilities.proto
index d040d538653..f49864ac096 100644
--- a/src/proto/capabilities.proto
+++ b/src/proto/capabilities.proto
@@ -10,4 +10,5 @@ message Capabilities {
     // When some macro is deleted, the corresponding value should be marked as "reserved".
     // It is suggested to assign a new field number to a macro when its scope has significantly changed.
     optional bool nat64 = 1; // OTBR_ENABLE_NAT64
+    optional bool dhcp6_pd = 2; // OTBR_ENABLE_DHCP6_PD
 }
diff --git a/src/proto/feature_flag.proto b/src/proto/feature_flag.proto
index 1b1cf01b5c6..2b82b89660e 100644
--- a/src/proto/feature_flag.proto
+++ b/src/proto/feature_flag.proto
@@ -62,4 +62,6 @@ message FeatureFlagList {
   optional bool enable_trel = 4 [default = false];
   // Whether to enable upstream DNS forwarding.
   optional bool enable_dns_upstream_query = 5 [default = false];
+  // Whether to enable prefix delegation.
+  optional bool enable_dhcp6_pd = 6 [default = false];
 }
diff --git a/third_party/openthread/CMakeLists.txt b/third_party/openthread/CMakeLists.txt
index af8ddf49a80..03ad863352d 100644
--- a/third_party/openthread/CMakeLists.txt
+++ b/third_party/openthread/CMakeLists.txt
@@ -35,6 +35,7 @@ set(OT_BORDER_AGENT_ID ON CACHE STRING "enable border agent ID" FORCE)
 set(OT_BORDER_ROUTER ON CACHE STRING "enable border router feature" FORCE)
 set(OT_BORDER_ROUTING ${OTBR_BORDER_ROUTING} CACHE STRING "enable border routing feature" FORCE)
 set(OT_BORDER_ROUTING_COUNTERS ${OTBR_BORDER_ROUTING_COUNTERS} CACHE STRING "enable border routing counters feature" FORCE)
+set(OT_BORDER_ROUTING_DHCP6_PD ${OTBR_DHCP6_PD} CACHE STRING "enable dhcpv6 pd support in border routing" FORCE)
 set(OT_BUILD_EXECUTABLES OFF CACHE STRING "disable building executables" FORCE)
 set(OT_BUILTIN_MBEDTLS_MANAGEMENT OFF CACHE STRING "diable mbedTLS management" FORCE)
 set(OT_CHILD_SUPERVISION ON CACHE STRING "enable child supervision" FORCE)