/*
* Copyright 2016-present 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.isis.io.isispacket.pdu;
import com.google.common.base.MoreObjects;
import com.google.common.base.Objects;
import com.google.common.primitives.Bytes;
import org.jboss.netty.buffer.ChannelBuffer;
import org.onosproject.isis.io.isispacket.IsisHeader;
import org.onosproject.isis.io.isispacket.tlv.IsisTlv;
import org.onosproject.isis.io.isispacket.tlv.TlvFinder;
import org.onosproject.isis.io.isispacket.tlv.TlvHeader;
import org.onosproject.isis.io.isispacket.tlv.TlvType;
import org.onosproject.isis.io.isispacket.tlv.TlvsToBytes;
import org.onosproject.isis.io.util.IsisUtil;
import java.util.ArrayList;
import java.util.List;
/**
* Representation of complete sequence number PDU.
*/
public class Csnp extends IsisHeader {
/*
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Intra-domain Routing Protocol Discriminator |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Length Indicator |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version/Protocol ID Extension |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ID Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| R | R | R | PDU Type |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Maximum area address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PDU Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Source ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Start LSP ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| End LSP ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Variable Lengths Fields |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
CSNP Message Format
REFERENCE : ISO/IEC 10589
*/
private int pduLength;
private String sourceId;
private String startLspId;
private String endLspId;
private List<IsisTlv> variableLengths = new ArrayList<>();
/**
* Creates the instance for this class.
*
* @param isisHeader ISIS header
*/
public Csnp(IsisHeader isisHeader) {
populateHeader(isisHeader);
}
/**
* Returns the list of all tlvs.
*
* @return variableLengths list of tlvs
*/
public List<IsisTlv> getAllTlv() {
return variableLengths;
}
/**
* Returns the source ID of csnp.
*
* @return sourceId source ID
*/
public String sourceId() {
return sourceId;
}
/**
* Sets the source ID for csnp.
*
* @param sourceId source ID
*/
public void setSourceId(String sourceId) {
this.sourceId = sourceId;
}
/**
* Returns the initial link state packet ID of csnp.
*
* @return startLspId start link state packet ID
*/
public String startLspId() {
return startLspId;
}
/**
* Sets the initial link state packet ID for csnp.
*
* @param startLspId start link state packet ID
*/
public void setStartLspId(String startLspId) {
this.startLspId = startLspId;
}
/**
* Returns the end link state packet ID of csnp.
*
* @return endLspId end link state packet ID of csnp.
*/
public String endLspId() {
return endLspId;
}
/**
* Sets the end link state packet ID for csnp.
*
* @param endLspId end link state packet ID of csnp.
*/
public void setEndLspId(String endLspId) {
this.endLspId = endLspId;
}
/**
* Returns the packet data unit length of link state packet.
* Entire length of this PDU, in octets
*
* @return pduLength packet date unit length
*/
public int pduLength() {
return pduLength;
}
/**
* Sets the packet data unit length for link state packet.
* Entire Length of this PDU, in octets
*
* @param pduLength packet data length
*/
public void setPduLength(int pduLength) {
this.pduLength = pduLength;
}
@Override
public void readFrom(ChannelBuffer channelBuffer) {
this.setPduLength(channelBuffer.readUnsignedShort());
//source id + 1 value
byte[] tempByteArray = new byte[IsisUtil.ID_PLUS_ONE_BYTE];
channelBuffer.readBytes(tempByteArray, 0, IsisUtil.ID_PLUS_ONE_BYTE);
this.setSourceId(IsisUtil.systemIdPlus(tempByteArray));
//start lsp id + 2 value
tempByteArray = new byte[IsisUtil.ID_PLUS_TWO_BYTE];
channelBuffer.readBytes(tempByteArray, 0, IsisUtil.ID_PLUS_TWO_BYTE);
this.setStartLspId(IsisUtil.systemIdPlus(tempByteArray));
//end lsp id + 2 value
tempByteArray = new byte[IsisUtil.ID_PLUS_TWO_BYTE];
channelBuffer.readBytes(tempByteArray, 0, IsisUtil.ID_PLUS_TWO_BYTE);
this.setEndLspId(IsisUtil.systemIdPlus(tempByteArray));
//tlv here
while (channelBuffer.readableBytes() > 0) {
TlvHeader tlvHeader = new TlvHeader();
tlvHeader.setTlvType(channelBuffer.readUnsignedByte());
tlvHeader.setTlvLength(channelBuffer.readUnsignedByte());
TlvType tlvValue = TlvType.get(tlvHeader.tlvType());
if (tlvValue != null) {
IsisTlv tlv = TlvFinder.findTlv(tlvHeader, channelBuffer.readBytes(tlvHeader.tlvLength()));
if (tlv != null) {
this.variableLengths.add(tlv);
}
} else {
channelBuffer.readBytes(tlvHeader.tlvLength());
}
}
}
@Override
public byte[] asBytes() {
byte[] csnpMessage = null;
byte[] isisPduHeader = isisPduHeader();
byte[] csnpBody = completeSequenceNumberPduBody();
csnpMessage = Bytes.concat(isisPduHeader, csnpBody);
return csnpMessage;
}
/**
* Builds ISIS PDU header for complete sequence numbers PDU.
*
* @return isisPduHeader ISIS PDU header
*/
public byte[] isisPduHeader() {
List<Byte> headerList = new ArrayList<>();
headerList.add(this.irpDiscriminator());
headerList.add((byte) IsisUtil.getPduHeaderLength(this.pduType()));
headerList.add(this.version());
headerList.add(this.idLength());
headerList.add((byte) this.pduType());
headerList.add(this.version2());
headerList.add(this.reserved());
headerList.add(this.maximumAreaAddresses());
return Bytes.toArray(headerList);
}
/**
* Builds complete sequence numbers PDU body.
*
* @return bodyList complete sequence numbers PDU body
*/
public byte[] completeSequenceNumberPduBody() {
List<Byte> bodyList = new ArrayList<>();
bodyList.addAll(Bytes.asList(IsisUtil.convertToTwoBytes(this.pduLength())));
bodyList.addAll(IsisUtil.sourceAndLanIdToBytes(this.sourceId()));
bodyList.addAll(IsisUtil.sourceAndLanIdToBytes(this.startLspId()));
bodyList.addAll(IsisUtil.sourceAndLanIdToBytes(this.endLspId()));
for (IsisTlv isisTlv : variableLengths) {
bodyList.addAll(TlvsToBytes.tlvToBytes(isisTlv));
}
return Bytes.toArray(bodyList);
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.omitNullValues()
.add("pduLength", pduLength)
.add("sourceId", sourceId)
.add("startLspId", startLspId)
.add("endLspId", endLspId)
.toString();
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
Csnp that = (Csnp) o;
return Objects.equal(pduLength, that.pduLength) &&
Objects.equal(sourceId, that.sourceId) &&
Objects.equal(startLspId, that.startLspId) &&
Objects.equal(endLspId, that.endLspId);
}
@Override
public int hashCode() {
return Objects.hashCode(pduLength, sourceId, startLspId, endLspId);
}
}