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/*
* Copyright 2015 Open Networking Laboratory
*
* 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 org.onlab.packet;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Map;
import static org.onlab.packet.PacketUtils.checkInput;
public class MPLS extends BasePacket {
public static final int HEADER_LENGTH = 4;
public static final byte PROTOCOL_IPV4 = 0x1;
public static final byte PROTOCOL_MPLS = 0x6;
static Map<Byte, Deserializer<? extends IPacket>> protocolDeserializerMap
= new HashMap<>();
static {
protocolDeserializerMap.put(PROTOCOL_IPV4, IPv4.deserializer());
protocolDeserializerMap.put(PROTOCOL_MPLS, MPLS.deserializer());
}
protected int label; //20bits
protected byte bos; //1bit
protected byte ttl; //8bits
protected byte protocol;
/**
* Default constructor that sets the version to 4.
*/
public MPLS() {
super();
this.bos = 1;
this.protocol = PROTOCOL_IPV4;
}
@Override
public byte[] serialize() {
byte[] payloadData = null;
if (payload != null) {
payload.setParent(this);
payloadData = payload.serialize();
}
byte[] data = new byte[(4 + ((payloadData != null) ? payloadData.length : 0)) ];
ByteBuffer bb = ByteBuffer.wrap(data);
bb.putInt(((this.label & 0x000fffff) << 12) | ((this.bos & 0x1) << 8 | (this.ttl & 0xff)));
if (payloadData != null) {
bb.put(payloadData);
}
return data;
}
@Override
public IPacket deserialize(byte[] data, int offset, int length) {
ByteBuffer bb = ByteBuffer.wrap(data, offset, length);
int mplsheader = bb.getInt();
this.label = ((mplsheader & 0xfffff000) >> 12);
this.bos = (byte) ((mplsheader & 0x00000100) >> 8);
this.bos = (byte) (mplsheader & 0x000000ff);
this.protocol = (this.bos == 1) ? PROTOCOL_IPV4 : PROTOCOL_MPLS;
Deserializer<? extends IPacket> deserializer;
if (protocolDeserializerMap.containsKey(this.protocol)) {
deserializer = protocolDeserializerMap.get(this.protocol);
} else {
deserializer = Data.deserializer();
}
try {
this.payload = deserializer.deserialize(data, bb.position(), bb.limit() - bb.position());
this.payload.setParent(this);
} catch (DeserializationException e) {
return this;
}
return this;
}
/**
* Returns the MPLS label.
*
* @return MPLS label
*/
public int getLabel() {
return label;
}
/**
* Sets the MPLS label.
*
* @param label MPLS label
*/
public void setLabel(int label) {
this.label = label;
}
/**
* Returns the MPLS TTL of the packet.
*
* @return MPLS TTL of the packet
*/
public byte getTtl() {
return ttl;
}
/**
* Sets the MPLS TTL of the packet.
*
* @param ttl MPLS TTL
*/
public void setTtl(byte ttl) {
this.ttl = ttl;
}
/**
* Deserializer function for MPLS packets.
*
* @return deserializer function
*/
public static Deserializer<MPLS> deserializer() {
return (data, offset, length) -> {
checkInput(data, offset, length, HEADER_LENGTH);
MPLS mpls = new MPLS();
ByteBuffer bb = ByteBuffer.wrap(data, offset, length);
int mplsheader = bb.getInt();
mpls.label = ((mplsheader & 0xfffff000) >>> 12);
mpls.bos = (byte) ((mplsheader & 0x00000100) >> 8);
mpls.ttl = (byte) (mplsheader & 0x000000ff);
mpls.protocol = (mpls.bos == 1) ? PROTOCOL_IPV4 : PROTOCOL_MPLS;
Deserializer<? extends IPacket> deserializer;
if (protocolDeserializerMap.containsKey(mpls.protocol)) {
deserializer = protocolDeserializerMap.get(mpls.protocol);
} else {
deserializer = Data.deserializer();
}
mpls.payload = deserializer.deserialize(data, bb.position(), bb.limit() - bb.position());
mpls.payload.setParent(mpls);
return mpls;
};
}
}
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