| /* |
| * Copyright (C) 2023 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.net.module.util.structs; |
| |
| import static com.android.net.module.util.NetworkStackConstants.DHCP6_OPTION_IAPREFIX; |
| |
| import com.android.net.module.util.Struct; |
| import com.android.net.module.util.Struct.Field; |
| import com.android.net.module.util.Struct.Type; |
| |
| import java.nio.ByteBuffer; |
| import java.nio.ByteOrder; |
| |
| /** |
| * DHCPv6 IA Prefix Option. |
| * https://tools.ietf.org/html/rfc8415. This does not contain any option. |
| * |
| * 0 1 2 3 |
| * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | OPTION_IAPREFIX | option-len | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | preferred-lifetime | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | valid-lifetime | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | prefix-length | | |
| * +-+-+-+-+-+-+-+-+ IPv6-prefix | |
| * | (16 octets) | |
| * | | |
| * | | |
| * | | |
| * | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | | . |
| * +-+-+-+-+-+-+-+-+ . |
| * . IAprefix-options . |
| * . . |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| */ |
| public class IaPrefixOption extends Struct { |
| public static final int LENGTH = 25; // option length excluding IAprefix-options |
| |
| @Field(order = 0, type = Type.S16) |
| public final short code; |
| @Field(order = 1, type = Type.S16) |
| public final short length; |
| @Field(order = 2, type = Type.U32) |
| public final long preferred; |
| @Field(order = 3, type = Type.U32) |
| public final long valid; |
| @Field(order = 4, type = Type.U8) |
| public final short prefixLen; |
| @Field(order = 5, type = Type.ByteArray, arraysize = 16) |
| public final byte[] prefix; |
| |
| IaPrefixOption(final short code, final short length, final long preferred, |
| final long valid, final short prefixLen, final byte[] prefix) { |
| this.code = code; |
| this.length = length; |
| this.preferred = preferred; |
| this.valid = valid; |
| this.prefixLen = prefixLen; |
| this.prefix = prefix.clone(); |
| } |
| |
| /** |
| * Build an IA_PD prefix option with given specific parameters. |
| */ |
| public static ByteBuffer build(final short length, final long preferred, final long valid, |
| final short prefixLen, final byte[] prefix) { |
| final IaPrefixOption option = new IaPrefixOption((byte) DHCP6_OPTION_IAPREFIX, |
| length /* 25 + IAPrefix options length */, preferred, valid, prefixLen, prefix); |
| return ByteBuffer.wrap(option.writeToBytes(ByteOrder.BIG_ENDIAN)); |
| } |
| } |