| /* |
| * Copyright (C) 2021 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 com.android.net.module.util.Struct; |
| import com.android.net.module.util.Struct.Field; |
| import com.android.net.module.util.Struct.Type; |
| |
| /** |
| * L4 UDP header as per https://tools.ietf.org/html/rfc768. |
| * |
| * 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 |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Source Port | Destination Port | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Length | Checksum | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | data octets ... |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ... |
| */ |
| public class UdpHeader extends Struct { |
| @Field(order = 0, type = Type.U16) |
| public final int srcPort; |
| @Field(order = 1, type = Type.U16) |
| public final int dstPort; |
| @Field(order = 2, type = Type.U16) |
| public final int length; |
| @Field(order = 3, type = Type.S16) |
| public final short checksum; |
| |
| public UdpHeader(final int srcPort, final int dstPort, final int length, |
| final short checksum) { |
| this.srcPort = srcPort; |
| this.dstPort = dstPort; |
| this.length = length; |
| this.checksum = checksum; |
| } |
| } |