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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.util.Arrays;
import java.util.Objects;
import org.jboss.netty.buffer.ChannelBuffer;
import org.onlab.packet.IpPrefix;
import org.onosproject.bgpio.util.Validation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.MoreObjects;
/**
* Provides IP Reachability InformationTlv Tlv which contains IP Prefix.
*/
public class IPReachabilityInformationTlv implements BGPValueType {
/*
* Reference :draft-ietf-idr-ls-distribution-11
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Prefix Length | IP Prefix (variable) //
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 14: IP Reachability Information TLV Format
*/
protected static final Logger log = LoggerFactory.getLogger(IPReachabilityInformationTlv.class);
public static final short TYPE = 265;
public static final int ONE_BYTE_LEN = 8;
private byte prefixLen;
private byte[] ipPrefix;
public short length;
/**
* Constructor to initialize parameters.
*
* @param prefixLen length of IP Prefix
* @param ipPrefix IP Prefix
* @param length length of value field
*/
public IPReachabilityInformationTlv(byte prefixLen, byte[] ipPrefix, short length) {
this.ipPrefix = ipPrefix;
this.prefixLen = prefixLen;
this.length = length;
}
/**
* Returns IP Prefix.
*
* @return IP Prefix
*/
public IpPrefix getPrefixValue() {
IpPrefix prefix = Validation.bytesToPrefix(ipPrefix, prefixLen);
return prefix;
}
/**
* Returns IP Prefix length.
*
* @return IP Prefix length
*/
public byte getPrefixLen() {
return this.prefixLen;
}
@Override
public int hashCode() {
return Objects.hash(Arrays.hashCode(ipPrefix), prefixLen);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof IPReachabilityInformationTlv) {
IPReachabilityInformationTlv other = (IPReachabilityInformationTlv) obj;
return Objects.equals(prefixLen, other.prefixLen) && Arrays.equals(ipPrefix, other.ipPrefix);
}
return false;
}
@Override
public int write(ChannelBuffer cb) {
int iLenStartIndex = cb.writerIndex();
cb.writeShort(TYPE);
cb.writeShort(length);
cb.writeByte(prefixLen);
cb.writeBytes(ipPrefix);
return cb.writerIndex() - iLenStartIndex;
}
/**
* Reads the channel buffer and returns object of IPReachabilityInformationTlv.
*
* @param cb ChannelBuffer
* @param length of value field
* @return object of IPReachabilityInformationTlv
*/
public static IPReachabilityInformationTlv read(ChannelBuffer cb, short length) {
byte preficLen = cb.readByte();
byte[] prefix;
if (preficLen == 0) {
prefix = new byte[] {0};
} else {
int len = preficLen / ONE_BYTE_LEN;
int reminder = preficLen % ONE_BYTE_LEN;
if (reminder > 0) {
len = len + 1;
}
prefix = new byte[len];
cb.readBytes(prefix, 0, len);
}
return IPReachabilityInformationTlv.of(preficLen, prefix, length);
}
public static IPReachabilityInformationTlv of(final byte preficLen, final byte[] prefix, final short length) {
return new IPReachabilityInformationTlv(preficLen, prefix, length);
}
@Override
public short getType() {
return TYPE;
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.add("Type", TYPE)
.add("Length", length)
.add("Prefixlength", getPrefixLen())
.add("Prefixvalue", getPrefixValue())
.toString();
}
}
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