protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/protocols/DefaultLispMapRequest.java - onos - Gitiles

 /*
  * 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.lisp.msg.protocols;

 import com.google.common.base.Objects;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.Lists;
 import io.netty.buffer.ByteBuf;
 import org.onlab.util.ByteOperator;
 import org.onosproject.lisp.msg.exceptions.LispParseError;
 import org.onosproject.lisp.msg.exceptions.LispReaderException;
 import org.onosproject.lisp.msg.exceptions.LispWriterException;
 import org.onosproject.lisp.msg.types.LispAfiAddress;

 import java.util.List;

 import static com.google.common.base.MoreObjects.toStringHelper;
 import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkNotNull;
 import static org.onosproject.lisp.msg.types.LispAfiAddress.AfiAddressWriter;
 import static org.onosproject.lisp.msg.protocols.LispEidRecord.EidRecordWriter;

 /**
  * Default LISP map request message class.
  */
 public final class DefaultLispMapRequest implements LispMapRequest {

     private final long nonce;
     private final byte recordCount;
     private final LispAfiAddress sourceEid;
     private final List<LispAfiAddress> itrRlocs;
     private final List<LispEidRecord> eidRecords;
     private final boolean authoritative;
     private final boolean mapDataPresent;
     private final boolean probe;
     private final boolean smr;
     private final boolean pitr;
     private final boolean smrInvoked;

     /**
      * A private constructor that protects object instantiation from external.
      *
      * @param nonce          nonce
      * @param recordCount    record count number
      * @param sourceEid      source EID address
      * @param itrRlocs       a collection of ITR RLOCs
      * @param eidRecords     a collection of EID records
      * @param authoritative  authoritative flag
      * @param mapDataPresent map data present flag
      * @param probe          probe flag
      * @param smr            smr flag
      * @param pitr           pitr flag
      * @param smrInvoked     smrInvoked flag
      */
     private DefaultLispMapRequest(long nonce, byte recordCount, LispAfiAddress sourceEid,
                                   List<LispAfiAddress> itrRlocs, List<LispEidRecord> eidRecords,
                                   boolean authoritative, boolean mapDataPresent, boolean probe,
                                   boolean smr, boolean pitr, boolean smrInvoked) {
         this.nonce = nonce;
         this.recordCount = recordCount;
         this.sourceEid = sourceEid;
         this.itrRlocs = itrRlocs;
         this.eidRecords = eidRecords;
         this.authoritative = authoritative;
         this.mapDataPresent = mapDataPresent;
         this.probe = probe;
         this.smr = smr;
         this.pitr = pitr;
         this.smrInvoked = smrInvoked;
     }

     @Override
     public LispType getType() {
         return LispType.LISP_MAP_REQUEST;
     }

     @Override
     public void writeTo(ByteBuf byteBuf) {
         // TODO: serialize LispMapRequest message
     }

     @Override
     public Builder createBuilder() {
         return new DefaultRequestBuilder();
     }

     @Override
     public boolean isAuthoritative() {
         return authoritative;
     }

     @Override
     public boolean isMapDataPresent() {
         return mapDataPresent;
     }

     @Override
     public boolean isProbe() {
         return probe;
     }

     @Override
     public boolean isSmr() {
         return smr;
     }

     @Override
     public boolean isPitr() {
         return pitr;
     }

     @Override
     public boolean isSmrInvoked() {
         return smrInvoked;
     }

     @Override
     public byte getRecordCount() {
         return recordCount;
     }

     @Override
     public long getNonce() {
         return nonce;
     }

     @Override
     public LispAfiAddress getSourceEid() {
         return sourceEid;
     }

     @Override
     public List<LispAfiAddress> getItrRlocs() {
         return ImmutableList.copyOf(itrRlocs);
     }

     @Override
     public List<LispEidRecord> getEids() {
         return ImmutableList.copyOf(eidRecords);
     }

     @Override
     public String toString() {
         return toStringHelper(this)
                 .add("type", getType())
                 .add("nonce", nonce)
                 .add("recordCount", recordCount)
                 .add("source EID", sourceEid)
                 .add("ITR rlocs", itrRlocs)
                 .add("EID records", eidRecords)
                 .add("authoritative", authoritative)
                 .add("mapDataPresent", mapDataPresent)
                 .add("probe", probe)
                 .add("SMR", smr)
                 .add("Proxy ITR", pitr)
                 .add("SMR Invoked", smrInvoked).toString();
     }

     @Override
     public boolean equals(Object o) {
         if (this == o) {
             return true;
         }
         if (o == null || getClass() != o.getClass()) {
             return false;
         }
         DefaultLispMapRequest that = (DefaultLispMapRequest) o;
         return Objects.equal(nonce, that.nonce) &&
                 Objects.equal(recordCount, that.recordCount) &&
                 Objects.equal(sourceEid, that.sourceEid) &&
                 Objects.equal(authoritative, that.authoritative) &&
                 Objects.equal(mapDataPresent, that.mapDataPresent) &&
                 Objects.equal(probe, that.probe) &&
                 Objects.equal(smr, that.smr) &&
                 Objects.equal(pitr, that.pitr) &&
                 Objects.equal(smrInvoked, that.smrInvoked);
     }

     @Override
     public int hashCode() {
         return Objects.hashCode(nonce, recordCount, sourceEid, authoritative,
                 mapDataPresent, probe, smr, pitr, smrInvoked);
     }

     public static final class DefaultRequestBuilder implements RequestBuilder {

         private long nonce;
         private byte recordCount;
         private LispAfiAddress sourceEid;
         private List<LispAfiAddress> itrRlocs = Lists.newArrayList();
         private List<LispEidRecord> eidRecords = Lists.newArrayList();
         private boolean authoritative;
         private boolean mapDataPresent;
         private boolean probe;
         private boolean smr;
         private boolean pitr;
         private boolean smrInvoked;

         @Override
         public LispType getType() {
             return LispType.LISP_MAP_REQUEST;
         }

         @Override
         public RequestBuilder withIsAuthoritative(boolean authoritative) {
             this.authoritative = authoritative;
             return this;
         }

         @Override
         public RequestBuilder withIsProbe(boolean probe) {
             this.probe = probe;
             return this;
         }

         @Override
         public RequestBuilder withIsMapDataPresent(boolean mapDataPresent) {
             this.mapDataPresent = mapDataPresent;
             return this;
         }

         @Override
         public RequestBuilder withIsSmr(boolean smr) {
             this.smr = smr;
             return this;
         }

         @Override
         public RequestBuilder withIsPitr(boolean pitr) {
             this.pitr = pitr;
             return this;
         }

         @Override
         public RequestBuilder withIsSmrInvoked(boolean smrInvoked) {
             this.smrInvoked = smrInvoked;
             return this;
         }

         @Override
         public RequestBuilder withRecordCount(byte recordCount) {
             this.recordCount = recordCount;
             return this;
         }

         @Override
         public RequestBuilder withNonce(long nonce) {
             this.nonce = nonce;
             return this;
         }

         @Override
         public RequestBuilder withSourceEid(LispAfiAddress sourceEid) {
             this.sourceEid = sourceEid;
             return this;
         }

         @Override
         public RequestBuilder withItrRlocs(List<LispAfiAddress> itrRlocs) {
             if (itrRlocs != null) {
                 this.itrRlocs = ImmutableList.copyOf(itrRlocs);
             }
             return this;
         }

         @Override
         public RequestBuilder withEidRecords(List<LispEidRecord> records) {
             if (records != null) {
                 this.eidRecords = ImmutableList.copyOf(records);
             }
             return this;
         }

         @Override
         public LispMapRequest build() {

             checkNotNull(sourceEid, "Must have a source EID");
             checkArgument((itrRlocs != null) && (itrRlocs.size() > 0), "Must have an ITR RLOC entry");

             return new DefaultLispMapRequest(nonce, recordCount, sourceEid, itrRlocs,
                     eidRecords, authoritative, mapDataPresent, probe, smr, pitr, smrInvoked);
         }
     }

     /**
      * A LISP message reader for MapRequest message.
      */
     public static final class RequestReader implements LispMessageReader<LispMapRequest> {

         private static final int AUTHORITATIVE_INDEX = 3;
         private static final int MAP_DATA_PRESENT_INDEX = 2;
         private static final int PROBE_INDEX = 1;
         private static final int SMR_INDEX = 0;
         private static final int PITR_INDEX = 7;
         private static final int SMR_INVOKED_INDEX = 6;

         @Override
         public LispMapRequest readFrom(ByteBuf byteBuf) throws LispParseError, LispReaderException {

             if (byteBuf.readerIndex() != 0) {
                 return null;
             }

             byte typeWithFlags = byteBuf.readByte();

             // authoritative -> 1 bit
             boolean authoritative = ByteOperator.getBit(typeWithFlags, AUTHORITATIVE_INDEX);

             // mapDataPresent -> 1 bit
             boolean mapDataPresent = ByteOperator.getBit(typeWithFlags, MAP_DATA_PRESENT_INDEX);

             // probe -> 1 bit
             boolean probe = ByteOperator.getBit(typeWithFlags, PROBE_INDEX);

             // smr -> 1 bit
             boolean smr = ByteOperator.getBit(typeWithFlags, SMR_INDEX);

             byte reservedWithFlags = byteBuf.readByte();

             // pitr -> 1 bit
             boolean pitr = ByteOperator.getBit(reservedWithFlags, PITR_INDEX);

             // smrInvoked -> 1 bit
             boolean smrInvoked = ByteOperator.getBit(reservedWithFlags, SMR_INVOKED_INDEX);

             // let's skip reserved field, only obtains ITR counter value
             // assume that first 3 bits are all set as 0,
             // remain 5 bits represent Itr Rloc Counter (IRC)
             int irc = byteBuf.readUnsignedByte();

             // record count -> 8 bits
             int recordCount = byteBuf.readUnsignedByte();

             // nonce -> 64 bits
             long nonce = byteBuf.readLong();

             LispAfiAddress sourceEid = new LispAfiAddress.AfiAddressReader().readFrom(byteBuf);

             // deserialize a collection of RLOC addresses
             List<LispAfiAddress> itrRlocs = Lists.newArrayList();
             for (int i = 0; i < irc; i++) {
                 itrRlocs.add(new LispAfiAddress.AfiAddressReader().readFrom(byteBuf));
             }

             // deserialize a collection of EID records
             List<LispEidRecord> eidRecords = Lists.newArrayList();
             for (int i = 0; i < recordCount; i++) {
                 eidRecords.add(new LispEidRecord.EidRecordReader().readFrom(byteBuf));
             }

             return new DefaultRequestBuilder()
                         .withIsAuthoritative(authoritative)
                         .withIsMapDataPresent(mapDataPresent)
                         .withIsProbe(probe)
                         .withIsSmr(smr)
                         .withIsPitr(pitr)
                         .withIsSmrInvoked(smrInvoked)
                         .withNonce(nonce)
                         .withRecordCount((byte) recordCount)
                         .withSourceEid(sourceEid)
                         .withEidRecords(eidRecords)
                         .withItrRlocs(itrRlocs)
                         .build();
         }
     }

     /**
      * A LISP message writer for MapRequest message.
      */
     public static final class RequestWriter implements LispMessageWriter<LispMapRequest> {

         private static final int REQUEST_MSG_TYPE = 1;
         private static final int REQUEST_SHIFT_BIT = 4;

         private static final int AUTHORITATIVE_SHIFT_BIT = 3;
         private static final int MAP_DATA_PRESENT_SHIFT_BIT = 2;
         private static final int PROBE_SHIFT_BIT = 1;

         private static final int PITR_SHIFT_BIT = 7;
         private static final int SMR_INVOKED_SHIFT_BIT = 6;

         private static final int ENABLE_BIT = 1;
         private static final int DISABLE_BIT = 0;

         @Override
         public void writeTo(ByteBuf byteBuf, LispMapRequest message) throws LispWriterException {

             // specify LISP message type
             byte msgType = (byte) (REQUEST_MSG_TYPE << REQUEST_SHIFT_BIT);

             // authoritative flag
             byte authoritative = DISABLE_BIT;
             if (message.isAuthoritative()) {
                 authoritative = (byte) (ENABLE_BIT << AUTHORITATIVE_SHIFT_BIT);
             }

             // map data present flag
             byte mapDataPresent = DISABLE_BIT;
             if (message.isMapDataPresent()) {
                 mapDataPresent = (byte) (ENABLE_BIT << MAP_DATA_PRESENT_SHIFT_BIT);
             }

             // probe flag
             byte probe = DISABLE_BIT;
             if (message.isProbe()) {
                 probe = (byte) (ENABLE_BIT << PROBE_SHIFT_BIT);
             }

             // SMR flag
             byte smr = DISABLE_BIT;
             if (message.isSmr()) {
                 smr = (byte) ENABLE_BIT;
             }

             byteBuf.writeByte((byte) (msgType + authoritative + mapDataPresent + probe + smr));

             // PITR flag bit
             byte pitr = DISABLE_BIT;
             if (message.isPitr()) {
                 pitr = (byte) (ENABLE_BIT << PITR_SHIFT_BIT);
             }

             // SMR invoked flag bit
             byte smrInvoked = DISABLE_BIT;
             if (message.isSmrInvoked()) {
                 smrInvoked = (byte) (ENABLE_BIT << SMR_INVOKED_SHIFT_BIT);
             }

             byteBuf.writeByte((byte) (pitr + smrInvoked));

             // ITR Rloc count
             byteBuf.writeByte((byte) message.getItrRlocs().size());

             // record count
             byteBuf.writeByte(message.getRecordCount());

             // nonce
             byteBuf.writeLong(message.getNonce());

             // Source EID AFI with Source EID address
             AfiAddressWriter afiAddressWriter = new AfiAddressWriter();
             afiAddressWriter.writeTo(byteBuf, message.getSourceEid());

             // ITR RLOCs
             List<LispAfiAddress> rlocs = message.getItrRlocs();
             for (int i = 0; i < rlocs.size(); i++) {
                 afiAddressWriter.writeTo(byteBuf, rlocs.get(i));
             }

             // EID records
             EidRecordWriter recordWriter = new EidRecordWriter();
             List<LispEidRecord> records = message.getEids();

             for (int i = 0; i < records.size(); i++) {
                 recordWriter.writeTo(byteBuf, records.get(i));
             }

             // TODO: handle Map-Reply record
         }
     }
 }
	/*
	* 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.lisp.msg.protocols;

	import com.google.common.base.Objects;
	import com.google.common.collect.ImmutableList;
	import com.google.common.collect.Lists;
	import io.netty.buffer.ByteBuf;
	import org.onlab.util.ByteOperator;
	import org.onosproject.lisp.msg.exceptions.LispParseError;
	import org.onosproject.lisp.msg.exceptions.LispReaderException;
	import org.onosproject.lisp.msg.exceptions.LispWriterException;
	import org.onosproject.lisp.msg.types.LispAfiAddress;

	import java.util.List;

	import static com.google.common.base.MoreObjects.toStringHelper;
	import static com.google.common.base.Preconditions.checkArgument;
	import static com.google.common.base.Preconditions.checkNotNull;
	import static org.onosproject.lisp.msg.types.LispAfiAddress.AfiAddressWriter;
	import static org.onosproject.lisp.msg.protocols.LispEidRecord.EidRecordWriter;

	/**
	* Default LISP map request message class.
	*/
	public final class DefaultLispMapRequest implements LispMapRequest {

	private final long nonce;
	private final byte recordCount;
	private final LispAfiAddress sourceEid;
	private final List<LispAfiAddress> itrRlocs;
	private final List<LispEidRecord> eidRecords;
	private final boolean authoritative;
	private final boolean mapDataPresent;
	private final boolean probe;
	private final boolean smr;
	private final boolean pitr;
	private final boolean smrInvoked;

	/**
	* A private constructor that protects object instantiation from external.
	*
	* @param nonce nonce
	* @param recordCount record count number
	* @param sourceEid source EID address
	* @param itrRlocs a collection of ITR RLOCs
	* @param eidRecords a collection of EID records
	* @param authoritative authoritative flag
	* @param mapDataPresent map data present flag
	* @param probe probe flag
	* @param smr smr flag
	* @param pitr pitr flag
	* @param smrInvoked smrInvoked flag
	*/
	private DefaultLispMapRequest(long nonce, byte recordCount, LispAfiAddress sourceEid,
	List<LispAfiAddress> itrRlocs, List<LispEidRecord> eidRecords,
	boolean authoritative, boolean mapDataPresent, boolean probe,
	boolean smr, boolean pitr, boolean smrInvoked) {
	this.nonce = nonce;
	this.recordCount = recordCount;
	this.sourceEid = sourceEid;
	this.itrRlocs = itrRlocs;
	this.eidRecords = eidRecords;
	this.authoritative = authoritative;
	this.mapDataPresent = mapDataPresent;
	this.probe = probe;
	this.smr = smr;
	this.pitr = pitr;
	this.smrInvoked = smrInvoked;
	}

	@Override
	public LispType getType() {
	return LispType.LISP_MAP_REQUEST;
	}

	@Override
	public void writeTo(ByteBuf byteBuf) {
	// TODO: serialize LispMapRequest message
	}

	@Override
	public Builder createBuilder() {
	return new DefaultRequestBuilder();
	}

	@Override
	public boolean isAuthoritative() {
	return authoritative;
	}

	@Override
	public boolean isMapDataPresent() {
	return mapDataPresent;
	}

	@Override
	public boolean isProbe() {
	return probe;
	}

	@Override
	public boolean isSmr() {
	return smr;
	}

	@Override
	public boolean isPitr() {
	return pitr;
	}

	@Override
	public boolean isSmrInvoked() {
	return smrInvoked;
	}

	@Override
	public byte getRecordCount() {
	return recordCount;
	}

	@Override
	public long getNonce() {
	return nonce;
	}

	@Override
	public LispAfiAddress getSourceEid() {
	return sourceEid;
	}

	@Override
	public List<LispAfiAddress> getItrRlocs() {
	return ImmutableList.copyOf(itrRlocs);
	}

	@Override
	public List<LispEidRecord> getEids() {
	return ImmutableList.copyOf(eidRecords);
	}

	@Override
	public String toString() {
	return toStringHelper(this)
	.add("type", getType())
	.add("nonce", nonce)
	.add("recordCount", recordCount)
	.add("source EID", sourceEid)
	.add("ITR rlocs", itrRlocs)
	.add("EID records", eidRecords)
	.add("authoritative", authoritative)
	.add("mapDataPresent", mapDataPresent)
	.add("probe", probe)
	.add("SMR", smr)
	.add("Proxy ITR", pitr)
	.add("SMR Invoked", smrInvoked).toString();
	}

	@Override
	public boolean equals(Object o) {
	if (this == o) {
	return true;
	}
	if (o == null \|\| getClass() != o.getClass()) {
	return false;
	}
	DefaultLispMapRequest that = (DefaultLispMapRequest) o;
	return Objects.equal(nonce, that.nonce) &&
	Objects.equal(recordCount, that.recordCount) &&
	Objects.equal(sourceEid, that.sourceEid) &&
	Objects.equal(authoritative, that.authoritative) &&
	Objects.equal(mapDataPresent, that.mapDataPresent) &&
	Objects.equal(probe, that.probe) &&
	Objects.equal(smr, that.smr) &&
	Objects.equal(pitr, that.pitr) &&
	Objects.equal(smrInvoked, that.smrInvoked);
	}

	@Override
	public int hashCode() {
	return Objects.hashCode(nonce, recordCount, sourceEid, authoritative,
	mapDataPresent, probe, smr, pitr, smrInvoked);
	}

	public static final class DefaultRequestBuilder implements RequestBuilder {

	private long nonce;
	private byte recordCount;
	private LispAfiAddress sourceEid;
	private List<LispAfiAddress> itrRlocs = Lists.newArrayList();
	private List<LispEidRecord> eidRecords = Lists.newArrayList();
	private boolean authoritative;
	private boolean mapDataPresent;
	private boolean probe;
	private boolean smr;
	private boolean pitr;
	private boolean smrInvoked;

	@Override
	public LispType getType() {
	return LispType.LISP_MAP_REQUEST;
	}

	@Override
	public RequestBuilder withIsAuthoritative(boolean authoritative) {
	this.authoritative = authoritative;
	return this;
	}

	@Override
	public RequestBuilder withIsProbe(boolean probe) {
	this.probe = probe;
	return this;
	}

	@Override
	public RequestBuilder withIsMapDataPresent(boolean mapDataPresent) {
	this.mapDataPresent = mapDataPresent;
	return this;
	}

	@Override
	public RequestBuilder withIsSmr(boolean smr) {
	this.smr = smr;
	return this;
	}

	@Override
	public RequestBuilder withIsPitr(boolean pitr) {
	this.pitr = pitr;
	return this;
	}

	@Override
	public RequestBuilder withIsSmrInvoked(boolean smrInvoked) {
	this.smrInvoked = smrInvoked;
	return this;
	}

	@Override
	public RequestBuilder withRecordCount(byte recordCount) {
	this.recordCount = recordCount;
	return this;
	}

	@Override
	public RequestBuilder withNonce(long nonce) {
	this.nonce = nonce;
	return this;
	}

	@Override
	public RequestBuilder withSourceEid(LispAfiAddress sourceEid) {
	this.sourceEid = sourceEid;
	return this;
	}

	@Override
	public RequestBuilder withItrRlocs(List<LispAfiAddress> itrRlocs) {
	if (itrRlocs != null) {
	this.itrRlocs = ImmutableList.copyOf(itrRlocs);
	}
	return this;
	}

	@Override
	public RequestBuilder withEidRecords(List<LispEidRecord> records) {
	if (records != null) {
	this.eidRecords = ImmutableList.copyOf(records);
	}
	return this;
	}

	@Override
	public LispMapRequest build() {

	checkNotNull(sourceEid, "Must have a source EID");
	checkArgument((itrRlocs != null) && (itrRlocs.size() > 0), "Must have an ITR RLOC entry");

	return new DefaultLispMapRequest(nonce, recordCount, sourceEid, itrRlocs,
	eidRecords, authoritative, mapDataPresent, probe, smr, pitr, smrInvoked);
	}
	}

	/**
	* A LISP message reader for MapRequest message.
	*/
	public static final class RequestReader implements LispMessageReader<LispMapRequest> {

	private static final int AUTHORITATIVE_INDEX = 3;
	private static final int MAP_DATA_PRESENT_INDEX = 2;
	private static final int PROBE_INDEX = 1;
	private static final int SMR_INDEX = 0;
	private static final int PITR_INDEX = 7;
	private static final int SMR_INVOKED_INDEX = 6;

	@Override
	public LispMapRequest readFrom(ByteBuf byteBuf) throws LispParseError, LispReaderException {

	if (byteBuf.readerIndex() != 0) {
	return null;
	}

	byte typeWithFlags = byteBuf.readByte();

	// authoritative -> 1 bit
	boolean authoritative = ByteOperator.getBit(typeWithFlags, AUTHORITATIVE_INDEX);

	// mapDataPresent -> 1 bit
	boolean mapDataPresent = ByteOperator.getBit(typeWithFlags, MAP_DATA_PRESENT_INDEX);

	// probe -> 1 bit
	boolean probe = ByteOperator.getBit(typeWithFlags, PROBE_INDEX);

	// smr -> 1 bit
	boolean smr = ByteOperator.getBit(typeWithFlags, SMR_INDEX);

	byte reservedWithFlags = byteBuf.readByte();

	// pitr -> 1 bit
	boolean pitr = ByteOperator.getBit(reservedWithFlags, PITR_INDEX);

	// smrInvoked -> 1 bit
	boolean smrInvoked = ByteOperator.getBit(reservedWithFlags, SMR_INVOKED_INDEX);

	// let's skip reserved field, only obtains ITR counter value
	// assume that first 3 bits are all set as 0,
	// remain 5 bits represent Itr Rloc Counter (IRC)
	int irc = byteBuf.readUnsignedByte();

	// record count -> 8 bits
	int recordCount = byteBuf.readUnsignedByte();

	// nonce -> 64 bits
	long nonce = byteBuf.readLong();

	LispAfiAddress sourceEid = new LispAfiAddress.AfiAddressReader().readFrom(byteBuf);

	// deserialize a collection of RLOC addresses
	List<LispAfiAddress> itrRlocs = Lists.newArrayList();
	for (int i = 0; i < irc; i++) {
	itrRlocs.add(new LispAfiAddress.AfiAddressReader().readFrom(byteBuf));
	}

	// deserialize a collection of EID records
	List<LispEidRecord> eidRecords = Lists.newArrayList();
	for (int i = 0; i < recordCount; i++) {
	eidRecords.add(new LispEidRecord.EidRecordReader().readFrom(byteBuf));
	}

	return new DefaultRequestBuilder()
	.withIsAuthoritative(authoritative)
	.withIsMapDataPresent(mapDataPresent)
	.withIsProbe(probe)
	.withIsSmr(smr)
	.withIsPitr(pitr)
	.withIsSmrInvoked(smrInvoked)
	.withNonce(nonce)
	.withRecordCount((byte) recordCount)
	.withSourceEid(sourceEid)
	.withEidRecords(eidRecords)
	.withItrRlocs(itrRlocs)
	.build();
	}
	}

	/**
	* A LISP message writer for MapRequest message.
	*/
	public static final class RequestWriter implements LispMessageWriter<LispMapRequest> {

	private static final int REQUEST_MSG_TYPE = 1;
	private static final int REQUEST_SHIFT_BIT = 4;

	private static final int AUTHORITATIVE_SHIFT_BIT = 3;
	private static final int MAP_DATA_PRESENT_SHIFT_BIT = 2;
	private static final int PROBE_SHIFT_BIT = 1;

	private static final int PITR_SHIFT_BIT = 7;
	private static final int SMR_INVOKED_SHIFT_BIT = 6;

	private static final int ENABLE_BIT = 1;
	private static final int DISABLE_BIT = 0;

	@Override
	public void writeTo(ByteBuf byteBuf, LispMapRequest message) throws LispWriterException {

	// specify LISP message type
	byte msgType = (byte) (REQUEST_MSG_TYPE << REQUEST_SHIFT_BIT);

	// authoritative flag
	byte authoritative = DISABLE_BIT;
	if (message.isAuthoritative()) {
	authoritative = (byte) (ENABLE_BIT << AUTHORITATIVE_SHIFT_BIT);
	}

	// map data present flag
	byte mapDataPresent = DISABLE_BIT;
	if (message.isMapDataPresent()) {
	mapDataPresent = (byte) (ENABLE_BIT << MAP_DATA_PRESENT_SHIFT_BIT);
	}

	// probe flag
	byte probe = DISABLE_BIT;
	if (message.isProbe()) {
	probe = (byte) (ENABLE_BIT << PROBE_SHIFT_BIT);
	}

	// SMR flag
	byte smr = DISABLE_BIT;
	if (message.isSmr()) {
	smr = (byte) ENABLE_BIT;
	}

	byteBuf.writeByte((byte) (msgType + authoritative + mapDataPresent + probe + smr));

	// PITR flag bit
	byte pitr = DISABLE_BIT;
	if (message.isPitr()) {
	pitr = (byte) (ENABLE_BIT << PITR_SHIFT_BIT);
	}

	// SMR invoked flag bit
	byte smrInvoked = DISABLE_BIT;
	if (message.isSmrInvoked()) {
	smrInvoked = (byte) (ENABLE_BIT << SMR_INVOKED_SHIFT_BIT);
	}

	byteBuf.writeByte((byte) (pitr + smrInvoked));

	// ITR Rloc count
	byteBuf.writeByte((byte) message.getItrRlocs().size());

	// record count
	byteBuf.writeByte(message.getRecordCount());

	// nonce
	byteBuf.writeLong(message.getNonce());

	// Source EID AFI with Source EID address
	AfiAddressWriter afiAddressWriter = new AfiAddressWriter();
	afiAddressWriter.writeTo(byteBuf, message.getSourceEid());

	// ITR RLOCs
	List<LispAfiAddress> rlocs = message.getItrRlocs();
	for (int i = 0; i < rlocs.size(); i++) {
	afiAddressWriter.writeTo(byteBuf, rlocs.get(i));
	}

	// EID records
	EidRecordWriter recordWriter = new EidRecordWriter();
	List<LispEidRecord> records = message.getEids();

	for (int i = 0; i < records.size(); i++) {
	recordWriter.writeTo(byteBuf, records.get(i));
	}

	// TODO: handle Map-Reply record
	}
	}
	}