DHCPv6 addr reg: get the DHCPv6 message type.

Flag: EXEMPT guarded by an legacy experiment flag
Bug: 293393743
Test: TH
Change-Id: If072a5bce0c8516af3fa4f7f9b63137de86b7500

staticlibs/device/com/android/net/module/util/dhcp6/Dhcp6AddrRegInformPacket.java

@@ -48,6 +48,13 @@ public class Dhcp6AddrRegInformPacket extends Dhcp6Packet {
         mValid = valid;
     }
 
+    /**
+     * Return the DHCPv6 ADDR_REG_INFORM message type (36).
+     */
+    public byte getMessageType() {
+        return DHCP6_MESSAGE_TYPE_ADDR_REG_INFORM;
+    }
+
     /**
      * Build a DHCPv6 ADDR-REG-INFORM message with the specific parameters.
      */

staticlibs/device/com/android/net/module/util/dhcp6/Dhcp6AddrRegReplyPacket.java

@@ -49,6 +49,13 @@ public class Dhcp6AddrRegReplyPacket extends Dhcp6Packet {
         mValid = valid;
     }
 
+    /**
+     * Return the DHCPv6 ADDR_REG_REPLY message type (37).
+     */
+    public byte getMessageType() {
+        return DHCP6_MESSAGE_TYPE_ADDR_REG_REPLY;
+    }
+
     /**
      * Build a DHCPv6 ADDR-REG-REPLY message with the specific parameters.
      */

staticlibs/device/com/android/net/module/util/dhcp6/Dhcp6AdvertisePacket.java

@@ -35,6 +35,13 @@ public class Dhcp6AdvertisePacket extends Dhcp6Packet {
         super(transId, 0 /* elapsedTime */, clientDuid, serverDuid, iapd);
     }
 
+    /**
+     * Return the DHCPv6 ADVERTISE message type (2).
+     */
+    public byte getMessageType() {
+        return DHCP6_MESSAGE_TYPE_ADVERTISE;
+    }
+
     /**
      * Build a DHCPv6 Advertise message with the specific parameters.
      */

staticlibs/device/com/android/net/module/util/dhcp6/Dhcp6Packet.java

@@ -47,7 +47,7 @@ import java.util.OptionalInt;
  *
  * @hide
  */
-public class Dhcp6Packet {
+public abstract class Dhcp6Packet {
     private static final String TAG = Dhcp6Packet.class.getSimpleName();
     /** DHCP constants copied from NetworkStackConstants.java */
     protected static final int DHCP_MAX_LENGTH = 1500;
@@ -72,6 +72,11 @@ public class Dhcp6Packet {
     public static final byte DHCP6_MESSAGE_TYPE_ADDR_REG_INFORM = 36;
     public static final byte DHCP6_MESSAGE_TYPE_ADDR_REG_REPLY = 37;
 
+    /**
+     * Returns a specific DHCPv6 message type.
+     */
+    public abstract byte getMessageType();
+
     /**
      * DHCPv6 Optional Type: Client Identifier.
      * DHCPv6 message from client must have this option.

staticlibs/device/com/android/net/module/util/dhcp6/Dhcp6RebindPacket.java

@@ -36,6 +36,13 @@ public class Dhcp6RebindPacket extends Dhcp6Packet {
         super(transId, elapsedTime, clientDuid, null /* serverDuid */, iapd);
     }
 
+    /**
+     * Return the DHCPv6 REBIND message type (6).
+     */
+    public byte getMessageType() {
+        return DHCP6_MESSAGE_TYPE_REBIND;
+    }
+
     /**
      * Build a DHCPv6 Rebind message with the specific parameters.
      */

staticlibs/device/com/android/net/module/util/dhcp6/Dhcp6RenewPacket.java

@@ -36,6 +36,13 @@ public class Dhcp6RenewPacket extends Dhcp6Packet {
         super(transId, elapsedTime, clientDuid, serverDuid, iapd);
     }
 
+    /**
+     * Return the DHCPv6 RENEW message type (5).
+     */
+    public byte getMessageType() {
+        return DHCP6_MESSAGE_TYPE_RENEW;
+    }
+
     /**
      * Build a DHCPv6 Renew message with the specific parameters.
      */

staticlibs/device/com/android/net/module/util/dhcp6/Dhcp6ReplyPacket.java

@@ -37,6 +37,13 @@ public class Dhcp6ReplyPacket extends Dhcp6Packet {
         mRapidCommit = rapidCommit;
     }
 
+    /**
+     * Return the DHCPv6 REPLY message type (7).
+     */
+    public byte getMessageType() {
+        return DHCP6_MESSAGE_TYPE_REPLY;
+    }
+
     /**
      * Build a DHCPv6 Reply message with the specific parameters.
      */

staticlibs/device/com/android/net/module/util/dhcp6/Dhcp6RequestPacket.java

@@ -35,6 +35,13 @@ public class Dhcp6RequestPacket extends Dhcp6Packet {
         super(transId, elapsedTime, clientDuid, serverDuid, iapd);
     }
 
+    /**
+     * Return the DHCPv6 REQUEST message type (3).
+     */
+    public byte getMessageType() {
+        return DHCP6_MESSAGE_TYPE_REQUEST;
+    }
+
     /**
      * Build a DHCPv6 Request message with the specific parameters.
      */

staticlibs/device/com/android/net/module/util/dhcp6/Dhcp6SolicitPacket.java

@@ -35,6 +35,13 @@ public class Dhcp6SolicitPacket extends Dhcp6Packet {
         mRapidCommit = rapidCommit;
     }
 
+    /**
+     * Return the DHCPv6 SOLICIT message type (1).
+     */
+    public byte getMessageType() {
+        return DHCP6_MESSAGE_TYPE_SOLICIT;
+    }
+
     /**
      * Build a DHCPv6 Solicit message with the specific parameters.
      */