1 /* 2 * Copyright (C) 2023 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.net.dhcp6; 18 19 import static com.android.net.module.util.NetworkStackConstants.DHCP_MAX_LENGTH; 20 21 import androidx.annotation.NonNull; 22 23 import java.nio.ByteBuffer; 24 25 /** 26 * DHCPv6 SOLICIT packet class, a client sends a Solicit message to locate DHCPv6 servers. 27 * 28 * https://tools.ietf.org/html/rfc8415#page-24 29 */ 30 public class Dhcp6SolicitPacket extends Dhcp6Packet { 31 /** 32 * Generates a solicit packet with the specified parameters. 33 */ Dhcp6SolicitPacket(int transId, int elapsedTime, @NonNull final byte[] clientDuid, final byte[] iapd, boolean rapidCommit)34 Dhcp6SolicitPacket(int transId, int elapsedTime, @NonNull final byte[] clientDuid, 35 final byte[] iapd, boolean rapidCommit) { 36 super(transId, elapsedTime, clientDuid, null /* serverDuid */, iapd); 37 mRapidCommit = rapidCommit; 38 } 39 40 /** 41 * Build a DHCPv6 Solicit message with the specific parameters. 42 */ buildPacket()43 public ByteBuffer buildPacket() { 44 final ByteBuffer packet = ByteBuffer.allocate(DHCP_MAX_LENGTH); 45 final int msgTypeAndTransId = (DHCP6_MESSAGE_TYPE_SOLICIT << 24) | mTransId; 46 packet.putInt(msgTypeAndTransId); 47 48 addTlv(packet, DHCP6_ELAPSED_TIME, (short) (mElapsedTime & 0xFFFF)); 49 addTlv(packet, DHCP6_CLIENT_IDENTIFIER, mClientDuid); 50 addTlv(packet, DHCP6_IA_PD, mIaPd); 51 addTlv(packet, DHCP6_OPTION_REQUEST_OPTION, DHCP6_SOL_MAX_RT); 52 if (mRapidCommit) { 53 addTlv(packet, DHCP6_RAPID_COMMIT); 54 } 55 56 packet.flip(); 57 return packet; 58 } 59 } 60