| /* |
| * 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.netlink; |
| |
| import androidx.annotation.NonNull; |
| import androidx.annotation.Nullable; |
| |
| 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; |
| |
| /** |
| * struct ifaddrmsg |
| * |
| * see also: |
| * |
| * include/uapi/linux/if_addr.h |
| * |
| * @hide |
| */ |
| public class StructIfaddrMsg extends Struct { |
| // Already aligned. |
| public static final int STRUCT_SIZE = 8; |
| |
| @Field(order = 0, type = Type.U8) |
| public final short family; |
| @Field(order = 1, type = Type.U8) |
| public final short prefixLen; |
| @Field(order = 2, type = Type.U8) |
| public final short flags; |
| @Field(order = 3, type = Type.U8) |
| public final short scope; |
| @Field(order = 4, type = Type.S32) |
| public final int index; |
| |
| StructIfaddrMsg(short family, short prefixLen, short flags, short scope, int index) { |
| this.family = family; |
| this.prefixLen = prefixLen; |
| this.flags = flags; |
| this.scope = scope; |
| this.index = index; |
| } |
| |
| /** |
| * Parse an ifaddrmsg struct from a {@link ByteBuffer}. |
| * |
| * @param byteBuffer The buffer from which to parse the ifaddrmsg. |
| * @return the parsed ifaddrmsg struct, or {@code null} if the ifaddrmsg struct |
| * could not be parsed successfully (for example, if it was truncated). |
| */ |
| @Nullable |
| public static StructIfaddrMsg parse(@NonNull final ByteBuffer byteBuffer) { |
| if (byteBuffer.remaining() < STRUCT_SIZE) return null; |
| |
| // The ByteOrder must already have been set to native order. |
| return Struct.parse(StructIfaddrMsg.class, byteBuffer); |
| } |
| |
| /** |
| * Write an ifaddrmsg struct to {@link ByteBuffer}. |
| */ |
| public void pack(@NonNull final ByteBuffer byteBuffer) { |
| // The ByteOrder must already have been set to native order. |
| this.writeToByteBuffer(byteBuffer); |
| } |
| } |