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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.onosproject.bgpio.types;
import java.net.InetAddress;
import java.util.Objects;
import org.jboss.netty.buffer.ChannelBuffer;
import org.onlab.packet.Ip4Address;
import org.onosproject.bgpio.exceptions.BgpParseException;
import org.onosproject.bgpio.util.Constants;
import org.onosproject.bgpio.util.Validation;
import com.google.common.base.MoreObjects;
import com.google.common.base.Preconditions;
/**
* Implementation of NextHop BGP Path Attribute.
*/
public class NextHop implements BgpValueType {
public static final byte NEXTHOP_TYPE = 3;
private boolean isNextHop = false;
private Ip4Address nextHop;
/**
* Constructor to initialize parameters.
*
* @param nextHop nextHop address
*/
public NextHop(Ip4Address nextHop) {
this.nextHop = Preconditions.checkNotNull(nextHop);
this.isNextHop = true;
}
/**
* Returns whether next hop is present.
*
* @return whether next hop is present
*/
public boolean isNextHopSet() {
return this.isNextHop;
}
/**
* Reads from ChannelBuffer and parses NextHop.
*
* @param cb ChannelBuffer
* @return object of NextHop
* @throws BgpParseException while parsing nexthop attribute
*/
public static NextHop read(ChannelBuffer cb) throws BgpParseException {
Ip4Address nextHop;
ChannelBuffer tempCb = cb.copy();
Validation parseFlags = Validation.parseAttributeHeader(cb);
if (cb.readableBytes() < parseFlags.getLength()) {
Validation.validateLen(BgpErrorType.UPDATE_MESSAGE_ERROR, BgpErrorType.ATTRIBUTE_LENGTH_ERROR,
parseFlags.getLength());
}
int len = parseFlags.isShort() ? parseFlags.getLength() + Constants.TYPE_AND_LEN_AS_SHORT : parseFlags
.getLength() + Constants.TYPE_AND_LEN_AS_BYTE;
ChannelBuffer data = tempCb.readBytes(len);
if (parseFlags.getFirstBit() && !parseFlags.getSecondBit() && parseFlags.getThirdBit()) {
throw new BgpParseException(BgpErrorType.UPDATE_MESSAGE_ERROR, BgpErrorType.ATTRIBUTE_FLAGS_ERROR, data);
}
InetAddress ipAddress = Validation.toInetAddress(parseFlags.getLength(), cb);
if (ipAddress.isMulticastAddress()) {
throw new BgpParseException("Multicast address is not supported");
}
nextHop = Ip4Address.valueOf(ipAddress);
return new NextHop(nextHop);
}
/**
* Return nexthop address.
*
* @return nexthop address
*/
public Ip4Address nextHop() {
return nextHop;
}
@Override
public short getType() {
return NEXTHOP_TYPE;
}
@Override
public int write(ChannelBuffer cb) {
//Not required to be implemented now
return 0;
}
@Override
public int hashCode() {
return Objects.hash(nextHop);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof NextHop) {
NextHop other = (NextHop) obj;
return Objects.equals(nextHop, other.nextHop);
}
return false;
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.add("nextHop", nextHop)
.toString();
}
@Override
public int compareTo(Object o) {
// TODO Auto-generated method stub
return 0;
}
}
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