mappingservice/southbound/src/main/java/org/opendaylight/lispflowmapping/southbound/lisp/LispSouthboundHandler.java

   1 /*
   2  * Copyright (c) 2014 Contextream, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.lispflowmapping.southbound.lisp;
  10
  11 import static org.opendaylight.yangtools.yang.common.UintConversions.fromJava;
  12
  13 import io.netty.buffer.ByteBufUtil;
  14 import io.netty.channel.Channel;
  15 import io.netty.channel.ChannelHandler;
  16 import io.netty.channel.ChannelHandlerContext;
  17 import io.netty.channel.SimpleChannelInboundHandler;
  18 import io.netty.channel.socket.DatagramPacket;
  19 import java.net.InetAddress;
  20 import java.nio.ByteBuffer;
  21 import java.util.ArrayList;
  22 import java.util.Arrays;
  23 import java.util.List;
  24 import java.util.Map;
  25 import java.util.Objects;
  26 import org.opendaylight.lispflowmapping.config.ConfigIni;
  27 import org.opendaylight.lispflowmapping.lisp.authentication.ILispAuthentication;
  28 import org.opendaylight.lispflowmapping.lisp.authentication.LispAuthenticationUtil;
  29 import org.opendaylight.lispflowmapping.lisp.serializer.MapNotifySerializer;
  30 import org.opendaylight.lispflowmapping.lisp.serializer.MapRegisterSerializer;
  31 import org.opendaylight.lispflowmapping.lisp.serializer.MapReplySerializer;
  32 import org.opendaylight.lispflowmapping.lisp.serializer.MapRequestSerializer;
  33 import org.opendaylight.lispflowmapping.lisp.type.LispMessage;
  34 import org.opendaylight.lispflowmapping.lisp.util.ByteUtil;
  35 import org.opendaylight.lispflowmapping.lisp.util.LispAddressStringifier;
  36 import org.opendaylight.lispflowmapping.lisp.util.MapRequestUtil;
  37 import org.opendaylight.lispflowmapping.southbound.ConcurrentLispSouthboundStats;
  38 import org.opendaylight.lispflowmapping.southbound.LispSouthboundPlugin;
  39 import org.opendaylight.lispflowmapping.southbound.lisp.cache.MapRegisterPartialDeserializer;
  40 import org.opendaylight.lispflowmapping.southbound.lisp.exception.LispMalformedPacketException;
  41 import org.opendaylight.lispflowmapping.southbound.lisp.network.PacketHeader;
  42 import org.opendaylight.lispflowmapping.southbound.util.LispNotificationHelper;
  43 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.PortNumber;
  44 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.AddMappingBuilder;
  45 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.GotMapNotifyBuilder;
  46 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.GotMapReplyBuilder;
  47 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.MapNotify;
  48 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.MapRegister;
  49 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.MapReply;
  50 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.MapRequest;
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.MappingKeepAlive;
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.MappingKeepAliveBuilder;
  53 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.MessageType;
  54 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.RequestMappingBuilder;
  55 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.eid.container.Eid;
  56 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.map.register.cache.key.container.MapRegisterCacheKey;
  57 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.map.register.cache.metadata.container.MapRegisterCacheMetadata;
  58 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.map.register.cache.metadata.container.MapRegisterCacheMetadataBuilder;
  59 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.map.register.cache.metadata.container.map.register.cache.metadata.EidLispAddress;
  60 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.map.register.cache.metadata.container.map.register.cache.metadata.EidLispAddressBuilder;
  61 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.map.register.cache.value.grouping.MapRegisterCacheValue;
  62 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.map.register.cache.value.grouping.MapRegisterCacheValueBuilder;
  63 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.mapping.authkey.container.MappingAuthkey;
  64 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.mapping.record.container.MappingRecord;
  65 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.mapping.record.list.MappingRecordItem;
  66 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.transport.address.TransportAddressBuilder;
  67 import org.slf4j.Logger;
  68 import org.slf4j.LoggerFactory;
  69
  70 @ChannelHandler.Sharable
  71 public class LispSouthboundHandler extends SimpleChannelInboundHandler<DatagramPacket>
  72         implements ILispSouthboundService, AutoCloseable {
  73     protected static final Logger LOG = LoggerFactory.getLogger(LispSouthboundHandler.class);
  74
  75     //TODO: think whether this field can be accessed through mappingservice or some other configuration parameter
  76     private boolean authenticationEnabled = ConfigIni.getInstance().isAuthEnabled();
  77     private final LispSouthboundPlugin lispSbPlugin;
  78     private boolean isReadFromChannelEnabled = true;
  79
  80     private Channel channel;
  81
  82     public LispSouthboundHandler(LispSouthboundPlugin lispSbPlugin) {
  83         this.lispSbPlugin = lispSbPlugin;
  84     }
  85
  86     public void handlePacket(DatagramPacket msg) {
  87         ByteBuffer inBuffer = msg.content().nioBuffer();
  88         int type = ByteUtil.getUnsignedByte(inBuffer, LispMessage.Pos.TYPE) >> 4;
  89         handleStats(type);
  90         Object lispType = MessageType.forValue(type);
  91         if (lispType == MessageType.EncapsulatedControlMessage) {
  92             LOG.trace("Received packet of type Encapsulated Control Message");
  93             handleEncapsulatedControlMessage(inBuffer, msg.sender().getAddress());
  94         } else if (lispType == MessageType.MapRequest) {
  95             LOG.trace("Received packet of type Map-Request");
  96             handleMapRequest(inBuffer, msg.sender().getAddress(), msg.sender().getPort());
  97         } else if (lispType == MessageType.MapRegister) {
  98             LOG.trace("Received packet of type Map-Register");
  99             handleMapRegister(inBuffer, msg.sender().getAddress(), msg.sender().getPort());
 100         } else if (lispType == MessageType.MapNotify) {
 101             LOG.trace("Received packet of type Map-Notify");
 102             handleMapNotify(inBuffer, msg.sender().getAddress(), msg.sender().getPort());
 103         } else if (lispType == MessageType.MapReply) {
 104             LOG.trace("Received packet of type Map-Reply");
 105             handleMapReply(inBuffer, msg.sender().getAddress(), msg.sender().getPort());
 106         } else {
 107             LOG.warn("Received unknown LISP control packet (type " + ((lispType != null) ? lispType : type) + ")");
 108         }
 109     }
 110
 111     @SuppressWarnings("checkstyle:IllegalCatch")
 112     private void handleEncapsulatedControlMessage(ByteBuffer inBuffer, InetAddress sourceAddress) {
 113         try {
 114             handleMapRequest(inBuffer, sourceAddress, extractEncapsulatedSourcePort(inBuffer));
 115         } catch (RuntimeException re) {
 116             throw new LispMalformedPacketException("Couldn't deserialize Map-Request (len="
 117                     + inBuffer.capacity() + ")", re);
 118         }
 119     }
 120
 121     @SuppressWarnings("checkstyle:IllegalCatch")
 122     private void handleMapRequest(ByteBuffer inBuffer, InetAddress sourceAddress, int port) {
 123         try {
 124             MapRequest request = MapRequestSerializer.getInstance().deserialize(inBuffer, sourceAddress);
 125             InetAddress finalSourceAddress = MapRequestUtil.selectItrRloc(request);
 126             if (finalSourceAddress == null) {
 127                 throw new LispMalformedPacketException("Couldn't deserialize Map-Request, no ITR Rloc found!");
 128             }
 129
 130             RequestMappingBuilder requestMappingBuilder = new RequestMappingBuilder();
 131             requestMappingBuilder.setMapRequest(LispNotificationHelper.convertMapRequest(request));
 132             TransportAddressBuilder transportAddressBuilder = new TransportAddressBuilder();
 133             transportAddressBuilder.setIpAddress(
 134                     LispNotificationHelper.getIpAddressBinaryFromInetAddress(finalSourceAddress));
 135             transportAddressBuilder.setPort(new PortNumber(fromJava(port)));
 136             requestMappingBuilder.setTransportAddress(transportAddressBuilder.build());
 137             lispSbPlugin.sendNotificationIfPossible(requestMappingBuilder.build());
 138         } catch (RuntimeException re) {
 139             throw new LispMalformedPacketException("Couldn't deserialize Map-Request (len="
 140                     + inBuffer.capacity() + ")", re);
 141         } catch (InterruptedException e) {
 142             LOG.warn("Notification publication interrupted!");
 143         }
 144     }
 145
 146     @SuppressWarnings("checkstyle:IllegalCatch")
 147     private int extractEncapsulatedSourcePort(ByteBuffer inBuffer) {
 148         try {
 149             inBuffer.position(PacketHeader.Length.LISP_ENCAPSULATION);
 150             int ipType = (inBuffer.get() >> 4);
 151             if (ipType == 4) {
 152                 inBuffer.position(inBuffer.position() + PacketHeader.Length.IPV4 - 1);
 153             } else if (ipType == 6) {
 154                 inBuffer.position(inBuffer.position() + PacketHeader.Length.IPV6_NO_EXT - 1);
 155             } else {
 156                 throw new LispMalformedPacketException(
 157                         "Couldn't deserialize Map-Request: inner packet has unknown IP version: " + ipType);
 158             }
 159
 160             int encapsulatedSourcePort = inBuffer.getShort() & 0xFFFF;
 161             inBuffer.position(inBuffer.position() + PacketHeader.Length.UDP - 2);
 162             return encapsulatedSourcePort;
 163         } catch (RuntimeException re) {
 164             throw new LispMalformedPacketException("Couldn't deserialize Map-Request (len="
 165                     + inBuffer.capacity() + ")", re);
 166         }
 167     }
 168
 169     @SuppressWarnings("checkstyle:IllegalCatch")
 170     private void handleMapRegister(ByteBuffer inBuffer, InetAddress sourceAddress, int port) {
 171         try {
 172             Map.Entry<MapRegisterCacheKey, byte[]> artificialEntry = null;
 173             MapRegisterCacheKey cacheKey = null;
 174             MapRegisterCacheValue cacheValue = null;
 175             if (lispSbPlugin.isMapRegisterCacheEnabled()) {
 176                 artificialEntry = MapRegisterPartialDeserializer.deserializePartially(inBuffer, sourceAddress);
 177                 cacheKey = artificialEntry == null ? null : artificialEntry.getKey();
 178                 cacheValue = resolveCacheValue(artificialEntry);
 179             }
 180             if (cacheValue != null) {
 181                 lispSbPlugin.getStats().incrementCacheHits();
 182                 MapRegisterCacheMetadata mapRegisterMeta = cacheValue.getMapRegisterCacheMetadata();
 183                 LOG.debug("Map register message site-ID: {} xTR-ID: {} from cache.", mapRegisterMeta.getSiteId(),
 184                         mapRegisterMeta.getXtrId());
 185                 cacheValue = refreshEntry(cacheKey);
 186                 if (cacheValue != null) {
 187                     lispSbPlugin.sendNotificationIfPossible(createMappingKeepAlive(cacheValue));
 188                     if (cacheValue.getMapRegisterCacheMetadata().isWantMapNotify()) {
 189                         sendMapNotifyMsg(inBuffer, sourceAddress, port, cacheValue);
 190                     }
 191                 }
 192             } else {
 193                 lispSbPlugin.getStats().incrementCacheMisses();
 194                 MapRegister mapRegister = MapRegisterSerializer.getInstance().deserialize(inBuffer, sourceAddress);
 195
 196                 MappingAuthkey mappingAuthkey = null;
 197                 if (authenticationEnabled) {
 198                     mappingAuthkey = tryToAuthenticateMessage(mapRegister, inBuffer);
 199                     if (mappingAuthkey == null) {
 200                         return;
 201                     }
 202                 }
 203
 204                 AddMappingBuilder addMappingBuilder = new AddMappingBuilder();
 205                 addMappingBuilder.setMapRegister(LispNotificationHelper.convertMapRegister(mapRegister));
 206                 TransportAddressBuilder transportAddressBuilder = new TransportAddressBuilder();
 207                 transportAddressBuilder.setIpAddress(LispNotificationHelper.getIpAddressBinaryFromInetAddress(
 208                         sourceAddress));
 209                 transportAddressBuilder.setPort(new PortNumber(fromJava(port)));
 210                 addMappingBuilder.setTransportAddress(transportAddressBuilder.build());
 211                 lispSbPlugin.sendNotificationIfPossible(addMappingBuilder.build());
 212                 if (artificialEntry != null) {
 213                     final MapRegisterCacheMetadataBuilder cacheMetadataBldNew = new
 214                             MapRegisterCacheMetadataBuilder();
 215                     cacheMetadataBldNew.setEidLispAddress(provideEidPrefixesFromMessage(mapRegister));
 216                     cacheMetadataBldNew.setXtrId(mapRegister.getXtrId());
 217                     cacheMetadataBldNew.setSiteId(mapRegister.getSiteId());
 218                     cacheMetadataBldNew.setWantMapNotify(mapRegister.isWantMapNotify());
 219                     cacheMetadataBldNew.setMergeEnabled(mapRegister.isMergeEnabled());
 220                     cacheMetadataBldNew.setTimestamp(System.currentTimeMillis());
 221
 222                     final MapRegisterCacheValueBuilder cacheValueBldNew = new MapRegisterCacheValueBuilder();
 223                     cacheValueBldNew.setPacketData(artificialEntry.getValue());
 224                     cacheValueBldNew.setMappingAuthkey(mappingAuthkey);
 225                     cacheValueBldNew.setMapRegisterCacheMetadata(cacheMetadataBldNew.build());
 226
 227                     lispSbPlugin.getMapRegisterCache().addEntry(cacheKey, cacheValueBldNew.build());
 228                 }
 229             }
 230         } catch (RuntimeException re) {
 231             throw new LispMalformedPacketException("Couldn't deserialize Map-Register (len="
 232                     + inBuffer.capacity() + ")", re);
 233         } catch (InterruptedException e) {
 234             LOG.warn("Notification publication interrupted!");
 235         }
 236     }
 237
 238     private MapRegisterCacheValue refreshEntry(final MapRegisterCacheKey cacheKey) {
 239         MapRegisterCacheValue mapRegisterCacheValue = lispSbPlugin.getMapRegisterCache().refreshEntry(cacheKey);
 240         if (mapRegisterCacheValue != null) {
 241             mapRegisterCacheValue = refreshAuthKeyIfNecessary(mapRegisterCacheValue);
 242             lispSbPlugin.getMapRegisterCache().addEntry(cacheKey, mapRegisterCacheValue);
 243             return mapRegisterCacheValue;
 244         }
 245         return null;
 246     }
 247
 248     private MapRegisterCacheValue refreshAuthKeyIfNecessary(MapRegisterCacheValue mapRegisterCacheValue) {
 249         final List<EidLispAddress> eids = mapRegisterCacheValue.getMapRegisterCacheMetadata().getEidLispAddress();
 250
 251         if (lispSbPlugin.getAuthenticationKeyDataListener().authKeysForEidsUnchanged(
 252                 eids, lispSbPlugin.getMapRegisterCacheTimeout())) {
 253             return mapRegisterCacheValue;
 254         }
 255
 256         final MappingAuthkey mappingAuthkey = provideAuthenticateKey(eids);
 257         final MapRegisterCacheValueBuilder newMapRegisterCacheValueBuilder = new MapRegisterCacheValueBuilder(
 258                 mapRegisterCacheValue);
 259         final MapRegisterCacheMetadataBuilder newMapRegisterCacheMetadataBuilder =
 260                 new MapRegisterCacheMetadataBuilder(mapRegisterCacheValue.getMapRegisterCacheMetadata());
 261
 262         newMapRegisterCacheValueBuilder.setMappingAuthkey(mappingAuthkey);
 263         newMapRegisterCacheValueBuilder.setMapRegisterCacheMetadata(newMapRegisterCacheMetadataBuilder.build());
 264         return newMapRegisterCacheValueBuilder.build();
 265     }
 266
 267     private MapRegisterCacheValue resolveCacheValue(Map.Entry<MapRegisterCacheKey, byte[]> entry) {
 268         if (entry != null) {
 269             final MapRegisterCacheValue mapRegisterCacheValue =
 270                     lispSbPlugin.getMapRegisterCache().getEntry(entry.getKey());
 271             if (mapRegisterCacheValue != null) {
 272                 final long creationTime = mapRegisterCacheValue.getMapRegisterCacheMetadata().getTimestamp();
 273                 final long currentTime = System.currentTimeMillis();
 274                 if (currentTime - creationTime > lispSbPlugin.getMapRegisterCacheTimeout()) {
 275                     lispSbPlugin.getMapRegisterCache().removeEntry(entry.getKey());
 276                     return null;
 277                 } else if (Arrays.equals(mapRegisterCacheValue.getPacketData(), entry.getValue())) {
 278                     return mapRegisterCacheValue;
 279                 }
 280             }
 281         }
 282         return null;
 283     }
 284
 285     private MappingKeepAlive createMappingKeepAlive(final MapRegisterCacheValue value) {
 286         MappingKeepAliveBuilder mappingKeepAliveBuilder = new MappingKeepAliveBuilder();
 287         mappingKeepAliveBuilder.setMapRegisterCacheMetadata(value.getMapRegisterCacheMetadata());
 288         return mappingKeepAliveBuilder.build();
 289     }
 290
 291     /**
 292      * Returns null if not all of eids have the same value of authentication key.
 293      */
 294     private MappingAuthkey provideAuthenticateKey(final List<EidLispAddress> eidLispAddresses) {
 295         MappingAuthkey firstAuthKey = null;
 296         for (int i = 0; i < eidLispAddresses.size(); i++) {
 297             final Eid eid = eidLispAddresses.get(i).getEid();
 298             if (i == 0) {
 299                 firstAuthKey = lispSbPlugin.getAkdb().getAuthenticationKey(eid);
 300             } else {
 301                 final MappingAuthkey authKey = lispSbPlugin.getAkdb().getAuthenticationKey(eid);
 302                 if (!Objects.equals(firstAuthKey, authKey)) {
 303                     return null;
 304                 }
 305             }
 306         }
 307         return firstAuthKey;
 308
 309     }
 310
 311     private void sendMapNotifyMsg(final ByteBuffer inBuffer, final InetAddress inetAddress, int portNumber,
 312                                   MapRegisterCacheValue mapRegisterValue) {
 313         if (mapRegisterValue.getMappingAuthkey().getKeyType() != null) {
 314             ByteBuffer outBuffer = transformMapRegisterToMapNotify(inBuffer);
 315             if (mapRegisterValue.getMappingAuthkey().getKeyType().toJava() != 0) {
 316                 outBuffer = calculateAndSetNewMAC(outBuffer, mapRegisterValue.getMappingAuthkey().getKeyString());
 317             }
 318             outBuffer.position(0);
 319             lispSbPlugin.handleSerializedLispBuffer(inetAddress, outBuffer, MessageType.MapNotify, portNumber,
 320                     this.channel);
 321         } else {
 322             LOG.error("Map-Register Cache: authentication succeeded, but can't find auth key for sending Map-Notify");
 323         }
 324     }
 325
 326     /**
 327      * Calculates new message authentication code (MAC) for notify message.
 328      */
 329     private ByteBuffer calculateAndSetNewMAC(final ByteBuffer buffer, final String authKey) {
 330         final byte[] authenticationData = LispAuthenticationUtil.createAuthenticationData(buffer, authKey);
 331         buffer.position(ILispAuthentication.MAP_REGISTER_AND_NOTIFY_AUTHENTICATION_POSITION);
 332         buffer.put(authenticationData);
 333         return buffer;
 334     }
 335
 336     private ByteBuffer transformMapRegisterToMapNotify(final ByteBuffer buffer) {
 337         buffer.position(0);
 338         byte typeAndFlags = buffer.get(0);
 339         // Shift the xTR-ID present and built for an RTR bits to their correct position
 340         byte flags = (byte) ((typeAndFlags << 2) & 0x0F);
 341         // Set control message type to 4 (Map-Notify)
 342         byte type = 0x40;
 343         // Combine the nibbles
 344         typeAndFlags = (byte) (type | flags);
 345         byte[] byteReplacement = new byte[] {typeAndFlags, 0x00, 0x00};
 346         buffer.put(byteReplacement);
 347
 348         return buffer;
 349     }
 350
 351     private List<EidLispAddress> provideEidPrefixesFromMessage(final MapRegister mapRegister) {
 352         List<EidLispAddress> eidsResult = new ArrayList<>();
 353         for (MappingRecordItem mappingRecordItem : mapRegister.getMappingRecordItem()) {
 354             final EidLispAddressBuilder eidLispAddressBuilder = new EidLispAddressBuilder();
 355             final Eid eid = mappingRecordItem.getMappingRecord().getEid();
 356             eidLispAddressBuilder.setEidLispAddressId(LispAddressStringifier.getString(eid));
 357             eidLispAddressBuilder.setEid(eid);
 358             eidsResult.add(eidLispAddressBuilder.build());
 359         }
 360         return eidsResult;
 361     }
 362
 363     /**
 364      * Checks whether authentication data is valid.
 365      *
 366      * <p>Methods pass through all records from map register message. For the EID of the first record it gets
 367      * authentication key and does validation of authentication data again this authentication key. If it pass
 368      * it just checks for remaining records (and its EID) whether they have the same authentication key stored in
 369      * the authentication key database.
 370      *
 371      * @return Returns authentication key if all of EIDs have the same authentication key or null otherwise
 372      */
 373     private MappingAuthkey tryToAuthenticateMessage(final MapRegister mapRegister, final ByteBuffer byteBuffer) {
 374         if (lispSbPlugin.getAkdb() == null) {
 375             LOG.debug("Simple map cache wasn't instantieted and set.");
 376             return null;
 377         }
 378
 379         MappingAuthkey firstAuthKey = null;
 380         final List<MappingRecordItem> mappingRecords = mapRegister.getMappingRecordItem();
 381         for (int i = 0; i < mappingRecords.size(); i++) {
 382             final MappingRecordItem recordItem = mappingRecords.get(i);
 383             final MappingRecord mappingRecord = recordItem.getMappingRecord();
 384             if (i == 0) {
 385                 firstAuthKey = lispSbPlugin.getAkdb().getAuthenticationKey(mappingRecord.getEid());
 386                 if (!LispAuthenticationUtil.validate(mapRegister, byteBuffer, mappingRecord.getEid(), firstAuthKey)) {
 387                     return null;
 388                 }
 389             } else {
 390                 final Eid eid = mappingRecord.getEid();
 391                 final MappingAuthkey authKey = lispSbPlugin.getAkdb().getAuthenticationKey(eid);
 392                 if (!firstAuthKey.equals(authKey)) {
 393                     LOG.debug("Map register packet contained several eids. Authentication keys for first one and for "
 394                             + "{} are different.",LispAddressStringifier.getString(eid));
 395                     return null;
 396                 }
 397             }
 398         }
 399         return firstAuthKey;
 400     }
 401
 402     @SuppressWarnings("checkstyle:IllegalCatch")
 403     private void handleMapNotify(ByteBuffer inBuffer, InetAddress sourceAddress, int port) {
 404         try {
 405             MapNotify mapNotify = MapNotifySerializer.getInstance().deserialize(inBuffer);
 406             GotMapNotifyBuilder gotMapNotifyBuilder = new GotMapNotifyBuilder();
 407             gotMapNotifyBuilder.setMapNotify(LispNotificationHelper.convertMapNotify(mapNotify));
 408             TransportAddressBuilder transportAddressBuilder = new TransportAddressBuilder();
 409             transportAddressBuilder.setIpAddress(LispNotificationHelper
 410                     .getIpAddressBinaryFromInetAddress(sourceAddress));
 411             transportAddressBuilder.setPort(new PortNumber(fromJava(port)));
 412             gotMapNotifyBuilder.setTransportAddress(transportAddressBuilder.build());
 413             lispSbPlugin.sendNotificationIfPossible(gotMapNotifyBuilder.build());
 414         } catch (RuntimeException re) {
 415             throw new LispMalformedPacketException("Couldn't deserialize Map-Notify (len="
 416                     + inBuffer.capacity() + ")", re);
 417         } catch (InterruptedException e) {
 418             LOG.warn("Notification publication interrupted!");
 419         }
 420     }
 421
 422     @SuppressWarnings("checkstyle:IllegalCatch")
 423     private void handleMapReply(ByteBuffer inBuffer, InetAddress sourceAddress, int port) {
 424         try {
 425             MapReply mapReply = MapReplySerializer.getInstance().deserialize(inBuffer);
 426             GotMapReplyBuilder gotMapReplyBuilder = new GotMapReplyBuilder();
 427             gotMapReplyBuilder.setMapReply(LispNotificationHelper.convertMapReply(mapReply));
 428             TransportAddressBuilder transportAddressBuilder = new TransportAddressBuilder();
 429             transportAddressBuilder.setIpAddress(LispNotificationHelper
 430                     .getIpAddressBinaryFromInetAddress(sourceAddress));
 431             transportAddressBuilder.setPort(new PortNumber(fromJava(port)));
 432             gotMapReplyBuilder.setTransportAddress(transportAddressBuilder.build());
 433             lispSbPlugin.sendNotificationIfPossible(gotMapReplyBuilder.build());
 434         } catch (RuntimeException re) {
 435             throw new LispMalformedPacketException("Couldn't deserialize Map-Reply (len="
 436                     + inBuffer.capacity() + ")", re);
 437         } catch (InterruptedException e) {
 438             LOG.warn("Notification publication interrupted!");
 439         }
 440     }
 441
 442     private void handleStats(int type) {
 443         if (lispSbPlugin.getStats() != null) {
 444             if (type <= ConcurrentLispSouthboundStats.MAX_LISP_TYPES) {
 445                 lispSbPlugin.getStats().incrementRx(type);
 446             } else {
 447                 lispSbPlugin.getStats().incrementRxUnknown();
 448             }
 449         }
 450     }
 451
 452     @Override
 453     protected void channelRead0(ChannelHandlerContext ctx, DatagramPacket msg) throws Exception {
 454         if (isReadFromChannelEnabled) {
 455             if (LOG.isTraceEnabled()) {
 456                 LOG.trace("Received UDP packet from {}:{} with content:\n{}", msg.sender().getHostString(),
 457                         msg.sender().getPort(), ByteBufUtil.prettyHexDump(msg.content()));
 458             }
 459             this.channel = ctx.channel();
 460             handlePacket(msg);
 461         }
 462     }
 463
 464     @Override
 465     public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
 466         ctx.flush();
 467     }
 468
 469     @Override
 470     public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
 471         LOG.error("Error on channel: " + cause, cause);
 472     }
 473
 474     @Override
 475     public void close() throws Exception {
 476     }
 477 }