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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;
public class IGMPQuery extends IGMPGroup {
// Bits and bytes after the group address
private byte resv = 0;
private boolean sbit = false;
private byte qrv = 2;
private byte qqic = 0x7d;
/**
* Create IGMP Query message.
*
* @param gaddr initiaze with a group address.
* @param auxInfo auxillary info.
*/
public IGMPQuery(IpAddress gaddr, int auxInfo) {
super(gaddr, auxInfo);
}
/**
* Create IGMP Query message.
*/
public IGMPQuery() {
super();
}
/**
* Is the S flag set? Telling adjacent routers to suppress normal timer updates.
*
* @return true if the flag is set, false otherwise
*/
public boolean isSbit() {
return sbit;
}
/**
* Set the S flag. Default is false.
*
* @param sbit true or false
*/
public void setSbit(boolean sbit) {
this.sbit = sbit;
}
/**
* Get the Querier Robustness Variable.
*
* @return querier robustness value
*/
public byte getQrv() {
return qrv;
}
/**
* Set the Querier Robustness Variable. Default is 2.
*
* @param qrv new querier robustness value
*/
public void setQrv(byte qrv) {
this.qrv = qrv;
}
/**
* Get the reserved field. Should be zero, but ignored regardless of it's value.
*
* @return the reserved field.
*/
public byte getResv() {
return resv;
}
/**
* Set the reserved field. Should be 0 and ignored by receivers.
*
* @param resv the reserved field.
*/
public void setResv(byte resv) {
this.resv = resv;
}
/**
* Serialize this IGMPQuery.
*
* @param bb the ByteBuffer to write into, positioned at the next spot to be written to.
* @return the serialized message
*/
@Override
public byte[] serialize(ByteBuffer bb) {
bb.put(gaddr.toOctets());
byte fld = (byte) (0x7 & qrv);
bb.put(fld);
bb.put(qqic);
bb.putShort((short) sources.size());
for (IpAddress ipaddr : sources) {
bb.put(ipaddr.toOctets());
}
return bb.array();
}
/**
* Deserialize the IGMP Query group structure.
*
* @param bb ByteBuffer pointing at the IGMP Query group address
* @return the IGMP Group object
*/
public IGMPGroup deserialize(ByteBuffer bb) throws DeserializationException {
gaddr = Ip4Address.valueOf(bb.getInt());
byte fld = bb.get();
// Just ignore the reserved bits
resv = 0;
this.sbit = ((fld & 0x8) == 0x8);
qrv = (byte) (fld & 0x7);
// QQIC field
qqic = bb.get();
// Get the number of sources.
short nsrcs = bb.getShort();
// Do a sanity check on the amount of space we have in our buffer.
int lengthNeeded = (Ip4Address.BYTE_LENGTH * nsrcs);
PacketUtils.checkHeaderLength(bb.remaining(), lengthNeeded);
for (; nsrcs > 0; nsrcs--) {
Ip4Address ipaddr = Ip4Address.valueOf(bb.getInt());
this.sources.add(ipaddr);
}
return this;
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#equals()
*/
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof IGMPQuery)) {
return false;
}
IGMPQuery other = (IGMPQuery) obj;
if (this.sbit != other.sbit) {
return false;
}
if (this.qrv != other.qrv) {
return false;
}
if (this.qqic != other.qqic) {
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.qqic;
result = prime * result + this.qrv;
result = prime * result + this.sources.hashCode();
return result;
}
}
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