From 270672310e91541c2d3d7d01df7238cff380e70f Mon Sep 17 00:00:00 2001
From: Xiao Ma <xiaom@google.com>
Date: Thu, 5 Jun 2025 19:34:35 +0900
Subject: [PATCH] DHCPv6 addr reg: add a function helper to create
 ADDR_REG_INFORM message.

Flag: EXEMPT guarded by an legacy experiment flag
Bug: 293393743
Test: TH
Change-Id: I6699b1479eec0958610b533af135f163681438df
---
 .../android/net/module/util/dhcp6/Dhcp6Packet.java   | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/staticlibs/device/com/android/net/module/util/dhcp6/Dhcp6Packet.java b/staticlibs/device/com/android/net/module/util/dhcp6/Dhcp6Packet.java
index 8447c8d3c8..dec0a399c5 100644
--- a/staticlibs/device/com/android/net/module/util/dhcp6/Dhcp6Packet.java
+++ b/staticlibs/device/com/android/net/module/util/dhcp6/Dhcp6Packet.java
@@ -798,4 +798,16 @@ public class Dhcp6Packet {
                 (int) (millisecs / 10) /* elapsed time */, clientDuid, iapd);
         return pkt.buildPacket();
     }
+
+    /**
+     * Builds a DHCPv6 ADDR-REG-INFORM packet from the required specified parameters.
+     */
+    public static ByteBuffer buildAddrRegInformPacket(int transId, long millisecs,
+            @NonNull final byte[] clientDuid, @NonNull final Inet6Address iaAddress, long preferred,
+            long valid) {
+        final Dhcp6AddrRegInformPacket pkt =
+                new Dhcp6AddrRegInformPacket(transId, (int) (millisecs / 10) /* elapsed time */,
+                        clientDuid, iaAddress, preferred, valid);
+        return pkt.buildPacket();
+    }
 }