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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 static org.onlab.packet.PacketUtils.checkBufferLength;
public class IGMPMembership extends IGMPGroup {
public static final byte MODE_IS_INCLUDE = 0x1;
public static final byte MODE_IS_EXCLUDE = 0x2;
public static final byte CHANGE_TO_INCLUDE_MODE = 0x3;
public static final byte CHANGE_TO_EXCLUDE_MODE = 0x4;
public static final byte ALLOW_NEW_SOURCES = 0x5;
public static final byte BLOCK_OLD_SOURCES = 0x6;
private final int minGroupRecordLen = Ip4Address.BYTE_LENGTH + 4;
protected byte recordType;
protected byte auxDataLength = 0;
protected byte[] auxData;
/**
* Constructor initialized with a multicast group address.
*
* @param gaddr A multicast group address.
*/
public IGMPMembership(Ip4Address gaddr) {
super(gaddr, 0);
}
/**
* Default constructor.
*/
public IGMPMembership() {
super();
}
/**
* Serialize this Membership Report.
*
* @param bb the ByteBuffer to write into, positioned at the next spot to be written to.
* @return serialized IGMP message.
*/
@Override
public byte[] serialize(ByteBuffer bb) {
bb.put(recordType);
bb.put(auxDataLength); // reserved
bb.putShort((short) sources.size());
bb.put(gaddr.toOctets());
for (IpAddress ipaddr : sources) {
bb.put(ipaddr.toOctets());
}
if (auxDataLength > 0) {
bb.put(auxData);
}
return bb.array();
}
/**
* Deserialize the IGMP Membership report packet.
*
* @param bb the ByteBuffer wrapping the serialized message. The position of the
* ByteBuffer should be pointing at the head of either message type.
* @return IGMP Group
* @throws DeserializationException if deserialization fails
*/
public IGMPGroup deserialize(ByteBuffer bb) throws DeserializationException {
// Make sure there is enough buffer to read the header,
// including the number of sources
checkBufferLength(bb.remaining(), 0, minGroupRecordLen);
recordType = bb.get();
auxDataLength = bb.get();
int nsrcs = bb.getShort();
gaddr = Ip4Address.valueOf(bb.getInt());
// Make sure we have enough buffer to hold all of these sources
checkBufferLength(bb.remaining(), 0, Ip4Address.BYTE_LENGTH * nsrcs);
for (; nsrcs > 0; nsrcs--) {
Ip4Address src = Ip4Address.valueOf(bb.getInt());
this.sources.add(src);
}
if (auxDataLength > 0) {
auxData = new byte[auxDataLength];
bb.get(auxData, 0, auxDataLength);
}
return this;
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#equals()
*/
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof IGMPMembership)) {
return false;
}
IGMPMembership other = (IGMPMembership) obj;
if (!this.gaddr.equals(other.gaddr)) {
return false;
}
if (this.recordType != other.recordType) {
return false;
}
if (this.auxDataLength != other.auxDataLength) {
return false;
}
if (this.sources.size() != other.sources.size()) {
return false;
}
// TODO: make these tolerant of order
if (!this.sources.equals(other.sources)) {
return false;
}
return true;
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
final int prime = 2521;
int result = super.hashCode();
result = prime * result + this.gaddr.hashCode();
result = prime * result + this.recordType;
result = prime * result + this.auxDataLength;
result = prime * result + this.sources.hashCode();
return result;
}
}
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