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/*
* 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 rtmsg
*
* see also:
*
* include/uapi/linux/rtnetlink.h
*
* @hide
*/
public class StructRtMsg extends Struct {
// Already aligned.
public static final int STRUCT_SIZE = 12;
@Field(order = 0, type = Type.U8)
public final short family; // Address family of route.
@Field(order = 1, type = Type.U8)
public final short dstLen; // Length of destination.
@Field(order = 2, type = Type.U8)
public final short srcLen; // Length of source.
@Field(order = 3, type = Type.U8)
public final short tos; // TOS filter.
@Field(order = 4, type = Type.U8)
public final short table; // Routing table ID.
@Field(order = 5, type = Type.U8)
public final short protocol; // Routing protocol.
@Field(order = 6, type = Type.U8)
public final short scope; // distance to the destination.
@Field(order = 7, type = Type.U8)
public final short type; // route type
@Field(order = 8, type = Type.U32)
public final long flags;
StructRtMsg(short family, short dstLen, short srcLen, short tos, short table, short protocol,
short scope, short type, long flags) {
this.family = family;
this.dstLen = dstLen;
this.srcLen = srcLen;
this.tos = tos;
this.table = table;
this.protocol = protocol;
this.scope = scope;
this.type = type;
this.flags = flags;
}
/**
* Parse a rtmsg struct from a {@link ByteBuffer}.
*
* @param byteBuffer The buffer from which to parse the rtmsg struct.
* @return the parsed rtmsg struct, or {@code null} if the rtmsg struct could not be
* parsed successfully (for example, if it was truncated).
*/
@Nullable
public static StructRtMsg 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(StructRtMsg.class, byteBuffer);
}
/**
* Write the rtmsg struct to {@link ByteBuffer}.
*/
public void pack(@NonNull final ByteBuffer byteBuffer) {
// The ByteOrder must already have been set to native order.
this.writeToByteBuffer(byteBuffer);
}
}
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