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.Arrays;
  22 import java.util.LinkedHashMap;
  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.metadata.container.map.register.cache.metadata.EidLispAddressKey;
  62 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.map.register.cache.value.grouping.MapRegisterCacheValue;
  63 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.map.register.cache.value.grouping.MapRegisterCacheValueBuilder;
  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.mapping.authkey.container.MappingAuthkey;
  67 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.transport.address.TransportAddressBuilder;
  68 import org.slf4j.Logger;
  69 import org.slf4j.LoggerFactory;
  70
  71 @ChannelHandler.Sharable
  72 public class LispSouthboundHandler extends SimpleChannelInboundHandler<DatagramPacket>
  73         implements ILispSouthboundService, AutoCloseable {
  74     protected static final Logger LOG = LoggerFactory.getLogger(LispSouthboundHandler.class);
  75
  76     //TODO: think whether this field can be accessed through mappingservice or some other configuration parameter
  77     private final boolean authenticationEnabled = ConfigIni.getInstance().isAuthEnabled();
  78     private final LispSouthboundPlugin lispSbPlugin;
  79     private final boolean isReadFromChannelEnabled = true;
  80
  81     private Channel channel;
  82
  83     public LispSouthboundHandler(LispSouthboundPlugin lispSbPlugin) {
  84         this.lispSbPlugin = lispSbPlugin;
  85     }
  86
  87     @Override
  88     public void handlePacket(DatagramPacket msg) {
  89         ByteBuffer inBuffer = msg.content().nioBuffer();
  90         int type = ByteUtil.getUnsignedByte(inBuffer, LispMessage.Pos.TYPE) >> 4;
  91         handleStats(type);
  92         Object lispType = MessageType.forValue(type);
  93         if (lispType == MessageType.EncapsulatedControlMessage) {
  94             LOG.trace("Received packet of type Encapsulated Control Message");
  95             handleEncapsulatedControlMessage(inBuffer, msg.sender().getAddress());
  96         } else if (lispType == MessageType.MapRequest) {
  97             LOG.trace("Received packet of type Map-Request");
  98             handleMapRequest(inBuffer, msg.sender().getAddress(), msg.sender().getPort());
  99         } else if (lispType == MessageType.MapRegister) {
 100             LOG.trace("Received packet of type Map-Register");
 101             handleMapRegister(inBuffer, msg.sender().getAddress(), msg.sender().getPort());
 102         } else if (lispType == MessageType.MapNotify) {
 103             LOG.trace("Received packet of type Map-Notify");
 104             handleMapNotify(inBuffer, msg.sender().getAddress(), msg.sender().getPort());
 105         } else if (lispType == MessageType.MapReply) {
 106             LOG.trace("Received packet of type Map-Reply");
 107             handleMapReply(inBuffer, msg.sender().getAddress(), msg.sender().getPort());
 108         } else {
 109             LOG.warn("Received unknown LISP control packet (type " + (lispType != null ? lispType : type) + ")");
 110         }
 111     }
 112
 113     @SuppressWarnings("checkstyle:IllegalCatch")
 114     private void handleEncapsulatedControlMessage(ByteBuffer inBuffer, InetAddress sourceAddress) {
 115         try {
 116             handleMapRequest(inBuffer, sourceAddress, extractEncapsulatedSourcePort(inBuffer));
 117         } catch (RuntimeException re) {
 118             throw new LispMalformedPacketException("Couldn't deserialize Map-Request (len="
 119                     + inBuffer.capacity() + ")", re);
 120         }
 121     }
 122
 123     @SuppressWarnings("checkstyle:IllegalCatch")
 124     private void handleMapRequest(ByteBuffer inBuffer, InetAddress sourceAddress, int port) {
 125         try {
 126             MapRequest request = MapRequestSerializer.getInstance().deserialize(inBuffer, sourceAddress);
 127             InetAddress finalSourceAddress = MapRequestUtil.selectItrRloc(request);
 128             if (finalSourceAddress == null) {
 129                 throw new LispMalformedPacketException("Couldn't deserialize Map-Request, no ITR Rloc found!");
 130             }
 131
 132             RequestMappingBuilder requestMappingBuilder = new RequestMappingBuilder();
 133             requestMappingBuilder.setMapRequest(LispNotificationHelper.convertMapRequest(request));
 134             TransportAddressBuilder transportAddressBuilder = new TransportAddressBuilder();
 135             transportAddressBuilder.setIpAddress(
 136                     LispNotificationHelper.getIpAddressBinaryFromInetAddress(finalSourceAddress));
 137             transportAddressBuilder.setPort(new PortNumber(fromJava(port)));
 138             requestMappingBuilder.setTransportAddress(transportAddressBuilder.build());
 139             lispSbPlugin.sendNotificationIfPossible(requestMappingBuilder.build());
 140         } catch (RuntimeException re) {
 141             throw new LispMalformedPacketException("Couldn't deserialize Map-Request (len="
 142                     + inBuffer.capacity() + ")", re);
 143         } catch (InterruptedException e) {
 144             LOG.warn("Notification publication interrupted!");
 145         }
 146     }
 147
 148     @SuppressWarnings("checkstyle:IllegalCatch")
 149     private static int extractEncapsulatedSourcePort(ByteBuffer inBuffer) {
 150         try {
 151             inBuffer.position(PacketHeader.Length.LISP_ENCAPSULATION);
 152             int ipType = inBuffer.get() >> 4;
 153             if (ipType == 4) {
 154                 inBuffer.position(inBuffer.position() + PacketHeader.Length.IPV4 - 1);
 155             } else if (ipType == 6) {
 156                 inBuffer.position(inBuffer.position() + PacketHeader.Length.IPV6_NO_EXT - 1);
 157             } else {
 158                 throw new LispMalformedPacketException(
 159                         "Couldn't deserialize Map-Request: inner packet has unknown IP version: " + ipType);
 160             }
 161
 162             int encapsulatedSourcePort = inBuffer.getShort() & 0xFFFF;
 163             inBuffer.position(inBuffer.position() + PacketHeader.Length.UDP - 2);
 164             return encapsulatedSourcePort;
 165         } catch (RuntimeException re) {
 166             throw new LispMalformedPacketException("Couldn't deserialize Map-Request (len="
 167                     + inBuffer.capacity() + ")", re);
 168         }
 169     }
 170
 171     @SuppressWarnings("checkstyle:IllegalCatch")
 172     private void handleMapRegister(ByteBuffer inBuffer, InetAddress sourceAddress, int port) {
 173         try {
 174             Map.Entry<MapRegisterCacheKey, byte[]> artificialEntry = null;
 175             MapRegisterCacheKey cacheKey = null;
 176             MapRegisterCacheValue cacheValue = null;
 177             if (lispSbPlugin.isMapRegisterCacheEnabled()) {
 178                 artificialEntry = MapRegisterPartialDeserializer.deserializePartially(inBuffer, sourceAddress);
 179                 cacheKey = artificialEntry == null ? null : artificialEntry.getKey();
 180                 cacheValue = resolveCacheValue(artificialEntry);
 181             }
 182             if (cacheValue != null) {
 183                 lispSbPlugin.getStats().incrementCacheHits();
 184                 MapRegisterCacheMetadata mapRegisterMeta = cacheValue.getMapRegisterCacheMetadata();
 185                 LOG.debug("Map register message site-ID: {} xTR-ID: {} from cache.", mapRegisterMeta.getSiteId(),
 186                         mapRegisterMeta.getXtrId());
 187                 cacheValue = refreshEntry(cacheKey);
 188                 if (cacheValue != null) {
 189                     lispSbPlugin.sendNotificationIfPossible(createMappingKeepAlive(cacheValue));
 190                     if (cacheValue.getMapRegisterCacheMetadata().getWantMapNotify()) {
 191                         sendMapNotifyMsg(inBuffer, sourceAddress, port, cacheValue);
 192                     }
 193                 }
 194             } else {
 195                 lispSbPlugin.getStats().incrementCacheMisses();
 196                 MapRegister mapRegister = MapRegisterSerializer.getInstance().deserialize(inBuffer, sourceAddress);
 197
 198                 MappingAuthkey mappingAuthkey = null;
 199                 if (authenticationEnabled) {
 200                     mappingAuthkey = tryToAuthenticateMessage(mapRegister, inBuffer);
 201                     if (mappingAuthkey == null) {
 202                         return;
 203                     }
 204                 }
 205
 206                 AddMappingBuilder addMappingBuilder = new AddMappingBuilder();
 207                 addMappingBuilder.setMapRegister(LispNotificationHelper.convertMapRegister(mapRegister));
 208                 TransportAddressBuilder transportAddressBuilder = new TransportAddressBuilder();
 209                 transportAddressBuilder.setIpAddress(LispNotificationHelper.getIpAddressBinaryFromInetAddress(
 210                         sourceAddress));
 211                 transportAddressBuilder.setPort(new PortNumber(fromJava(port)));
 212                 addMappingBuilder.setTransportAddress(transportAddressBuilder.build());
 213                 lispSbPlugin.sendNotificationIfPossible(addMappingBuilder.build());
 214                 if (artificialEntry != null) {
 215                     final MapRegisterCacheMetadataBuilder cacheMetadataBldNew = new
 216                             MapRegisterCacheMetadataBuilder();
 217                     cacheMetadataBldNew.setEidLispAddress(provideEidPrefixesFromMessage(mapRegister));
 218                     cacheMetadataBldNew.setXtrId(mapRegister.getXtrId());
 219                     cacheMetadataBldNew.setSiteId(mapRegister.getSiteId());
 220                     cacheMetadataBldNew.setWantMapNotify(mapRegister.getWantMapNotify());
 221                     cacheMetadataBldNew.setMergeEnabled(mapRegister.getMergeEnabled());
 222                     cacheMetadataBldNew.setTimestamp(System.currentTimeMillis());
 223
 224                     final MapRegisterCacheValueBuilder cacheValueBldNew = new MapRegisterCacheValueBuilder();
 225                     cacheValueBldNew.setPacketData(artificialEntry.getValue());
 226                     cacheValueBldNew.setMappingAuthkey(mappingAuthkey);
 227                     cacheValueBldNew.setMapRegisterCacheMetadata(cacheMetadataBldNew.build());
 228
 229                     lispSbPlugin.getMapRegisterCache().addEntry(cacheKey, cacheValueBldNew.build());
 230                 }
 231             }
 232         } catch (RuntimeException re) {
 233             throw new LispMalformedPacketException("Couldn't deserialize Map-Register (len="
 234                     + inBuffer.capacity() + ")", re);
 235         } catch (InterruptedException e) {
 236             LOG.warn("Notification publication interrupted!");
 237         }
 238     }
 239
 240     private MapRegisterCacheValue refreshEntry(final MapRegisterCacheKey cacheKey) {
 241         MapRegisterCacheValue mapRegisterCacheValue = lispSbPlugin.getMapRegisterCache().refreshEntry(cacheKey);
 242         if (mapRegisterCacheValue != null) {
 243             mapRegisterCacheValue = refreshAuthKeyIfNecessary(mapRegisterCacheValue);
 244             lispSbPlugin.getMapRegisterCache().addEntry(cacheKey, mapRegisterCacheValue);
 245             return mapRegisterCacheValue;
 246         }
 247         return null;
 248     }
 249
 250     private MapRegisterCacheValue refreshAuthKeyIfNecessary(MapRegisterCacheValue mapRegisterCacheValue) {
 251         final Map<EidLispAddressKey, EidLispAddress> eids = mapRegisterCacheValue.getMapRegisterCacheMetadata()
 252                 .getEidLispAddress();
 253
 254         if (lispSbPlugin.getAuthenticationKeyDataListener().authKeysForEidsUnchanged(
 255                 eids, lispSbPlugin.getMapRegisterCacheTimeout())) {
 256             return mapRegisterCacheValue;
 257         }
 258
 259         final MappingAuthkey mappingAuthkey = provideAuthenticateKey(eids);
 260         final MapRegisterCacheValueBuilder newMapRegisterCacheValueBuilder = new MapRegisterCacheValueBuilder(
 261                 mapRegisterCacheValue);
 262         final MapRegisterCacheMetadataBuilder newMapRegisterCacheMetadataBuilder =
 263                 new MapRegisterCacheMetadataBuilder(mapRegisterCacheValue.getMapRegisterCacheMetadata());
 264
 265         newMapRegisterCacheValueBuilder.setMappingAuthkey(mappingAuthkey);
 266         newMapRegisterCacheValueBuilder.setMapRegisterCacheMetadata(newMapRegisterCacheMetadataBuilder.build());
 267         return newMapRegisterCacheValueBuilder.build();
 268     }
 269
 270     private MapRegisterCacheValue resolveCacheValue(Map.Entry<MapRegisterCacheKey, byte[]> entry) {
 271         if (entry != null) {
 272             final MapRegisterCacheValue mapRegisterCacheValue =
 273                     lispSbPlugin.getMapRegisterCache().getEntry(entry.getKey());
 274             if (mapRegisterCacheValue != null) {
 275                 final long creationTime = mapRegisterCacheValue.getMapRegisterCacheMetadata().getTimestamp();
 276                 final long currentTime = System.currentTimeMillis();
 277                 if (currentTime - creationTime > lispSbPlugin.getMapRegisterCacheTimeout()) {
 278                     lispSbPlugin.getMapRegisterCache().removeEntry(entry.getKey());
 279                     return null;
 280                 } else if (Arrays.equals(mapRegisterCacheValue.getPacketData(), entry.getValue())) {
 281                     return mapRegisterCacheValue;
 282                 }
 283             }
 284         }
 285         return null;
 286     }
 287
 288     private static MappingKeepAlive createMappingKeepAlive(final MapRegisterCacheValue value) {
 289         MappingKeepAliveBuilder mappingKeepAliveBuilder = new MappingKeepAliveBuilder();
 290         mappingKeepAliveBuilder.setMapRegisterCacheMetadata(value.getMapRegisterCacheMetadata());
 291         return mappingKeepAliveBuilder.build();
 292     }
 293
 294     /**
 295      * Returns null if not all of eids have the same value of authentication key.
 296      */
 297     private MappingAuthkey provideAuthenticateKey(final Map<EidLispAddressKey, EidLispAddress> eidLispAddresses) {
 298         MappingAuthkey firstAuthKey = null;
 299         if (eidLispAddresses == null) {
 300             return null;
 301         }
 302         for (int i = 0; i < eidLispAddresses.size(); i++) {
 303             final Eid eid = eidLispAddresses.get(new EidLispAddressKey(Integer.toString(i))).getEid();
 304             if (i == 0) {
 305                 firstAuthKey = lispSbPlugin.getAkdb().getAuthenticationKey(eid);
 306             } else {
 307                 final MappingAuthkey authKey = lispSbPlugin.getAkdb().getAuthenticationKey(eid);
 308                 if (!Objects.equals(firstAuthKey, authKey)) {
 309                     return null;
 310                 }
 311             }
 312         }
 313         return firstAuthKey;
 314
 315     }
 316
 317     private void sendMapNotifyMsg(final ByteBuffer inBuffer, final InetAddress inetAddress, int portNumber,
 318                                   MapRegisterCacheValue mapRegisterValue) {
 319         if (mapRegisterValue.getMappingAuthkey().getKeyType() != null) {
 320             ByteBuffer outBuffer = transformMapRegisterToMapNotify(inBuffer);
 321             if (mapRegisterValue.getMappingAuthkey().getKeyType().toJava() != 0) {
 322                 outBuffer = calculateAndSetNewMAC(outBuffer, mapRegisterValue.getMappingAuthkey().getKeyString());
 323             }
 324             outBuffer.position(0);
 325             lispSbPlugin.handleSerializedLispBuffer(inetAddress, outBuffer, MessageType.MapNotify, portNumber,
 326                     this.channel);
 327         } else {
 328             LOG.error("Map-Register Cache: authentication succeeded, but can't find auth key for sending Map-Notify");
 329         }
 330     }
 331
 332     /**
 333      * Calculates new message authentication code (MAC) for notify message.
 334      */
 335     private static ByteBuffer calculateAndSetNewMAC(final ByteBuffer buffer, final String authKey) {
 336         final byte[] authenticationData = LispAuthenticationUtil.createAuthenticationData(buffer, authKey);
 337         buffer.position(ILispAuthentication.MAP_REGISTER_AND_NOTIFY_AUTHENTICATION_POSITION);
 338         buffer.put(authenticationData);
 339         return buffer;
 340     }
 341
 342     private static ByteBuffer transformMapRegisterToMapNotify(final ByteBuffer buffer) {
 343         buffer.position(0);
 344         byte typeAndFlags = buffer.get(0);
 345         // Shift the xTR-ID present and built for an RTR bits to their correct position
 346         byte flags = (byte) (typeAndFlags << 2 & 0x0F);
 347         // Set control message type to 4 (Map-Notify)
 348         byte type = 0x40;
 349         // Combine the nibbles
 350         typeAndFlags = (byte) (type | flags);
 351         byte[] byteReplacement = new byte[] {typeAndFlags, 0x00, 0x00};
 352         buffer.put(byteReplacement);
 353
 354         return buffer;
 355     }
 356
 357     private static Map<EidLispAddressKey, EidLispAddress> provideEidPrefixesFromMessage(final MapRegister mapRegister) {
 358         Map<EidLispAddressKey, EidLispAddress> eidsResult = new LinkedHashMap<>();
 359         int idx = 0;
 360         for (MappingRecordItem mappingRecordItem : mapRegister.getMappingRecordItem()) {
 361             final EidLispAddressBuilder eidLispAddressBuilder = new EidLispAddressBuilder();
 362             final Eid eid = mappingRecordItem.getMappingRecord().getEid();
 363             eidLispAddressBuilder.setEidLispAddressId(LispAddressStringifier.getString(eid));
 364             eidLispAddressBuilder.setEid(eid);
 365             eidsResult.put(new EidLispAddressKey(Integer.toString(idx)), eidLispAddressBuilder.build());
 366         }
 367         return eidsResult;
 368     }
 369
 370     /**
 371      * Checks whether authentication data is valid.
 372      *
 373      * <p>Methods pass through all records from map register message. For the EID of the first record it gets
 374      * authentication key and does validation of authentication data again this authentication key. If it pass
 375      * it just checks for remaining records (and its EID) whether they have the same authentication key stored in
 376      * the authentication key database.
 377      *
 378      * @return Returns authentication key if all of EIDs have the same authentication key or null otherwise
 379      */
 380     private MappingAuthkey tryToAuthenticateMessage(final MapRegister mapRegister, final ByteBuffer byteBuffer) {
 381         if (lispSbPlugin.getAkdb() == null) {
 382             LOG.debug("Simple map cache wasn't instantieted and set.");
 383             return null;
 384         }
 385
 386         MappingAuthkey firstAuthKey = null;
 387         final List<MappingRecordItem> mappingRecords = mapRegister.getMappingRecordItem();
 388         for (int i = 0; i < mappingRecords.size(); i++) {
 389             final MappingRecordItem recordItem = mappingRecords.get(i);
 390             final MappingRecord mappingRecord = recordItem.getMappingRecord();
 391             if (i == 0) {
 392                 firstAuthKey = lispSbPlugin.getAkdb().getAuthenticationKey(mappingRecord.getEid());
 393                 if (!LispAuthenticationUtil.validate(mapRegister, byteBuffer, mappingRecord.getEid(), firstAuthKey)) {
 394                     return null;
 395                 }
 396             } else {
 397                 final Eid eid = mappingRecord.getEid();
 398                 final MappingAuthkey authKey = lispSbPlugin.getAkdb().getAuthenticationKey(eid);
 399                 if (!firstAuthKey.equals(authKey)) {
 400                     LOG.debug("Map register packet contained several eids. Authentication keys for first one and for "
 401                             + "{} are different.",LispAddressStringifier.getString(eid));
 402                     return null;
 403                 }
 404             }
 405         }
 406         return firstAuthKey;
 407     }
 408
 409     @SuppressWarnings("checkstyle:IllegalCatch")
 410     private void handleMapNotify(ByteBuffer inBuffer, InetAddress sourceAddress, int port) {
 411         try {
 412             MapNotify mapNotify = MapNotifySerializer.getInstance().deserialize(inBuffer);
 413             GotMapNotifyBuilder gotMapNotifyBuilder = new GotMapNotifyBuilder();
 414             gotMapNotifyBuilder.setMapNotify(LispNotificationHelper.convertMapNotify(mapNotify));
 415             TransportAddressBuilder transportAddressBuilder = new TransportAddressBuilder();
 416             transportAddressBuilder.setIpAddress(LispNotificationHelper
 417                     .getIpAddressBinaryFromInetAddress(sourceAddress));
 418             transportAddressBuilder.setPort(new PortNumber(fromJava(port)));
 419             gotMapNotifyBuilder.setTransportAddress(transportAddressBuilder.build());
 420             lispSbPlugin.sendNotificationIfPossible(gotMapNotifyBuilder.build());
 421         } catch (RuntimeException re) {
 422             throw new LispMalformedPacketException("Couldn't deserialize Map-Notify (len="
 423                     + inBuffer.capacity() + ")", re);
 424         } catch (InterruptedException e) {
 425             LOG.warn("Notification publication interrupted!");
 426         }
 427     }
 428
 429     @SuppressWarnings("checkstyle:IllegalCatch")
 430     private void handleMapReply(ByteBuffer inBuffer, InetAddress sourceAddress, int port) {
 431         try {
 432             MapReply mapReply = MapReplySerializer.getInstance().deserialize(inBuffer);
 433             GotMapReplyBuilder gotMapReplyBuilder = new GotMapReplyBuilder();
 434             gotMapReplyBuilder.setMapReply(LispNotificationHelper.convertMapReply(mapReply));
 435             TransportAddressBuilder transportAddressBuilder = new TransportAddressBuilder();
 436             transportAddressBuilder.setIpAddress(LispNotificationHelper
 437                     .getIpAddressBinaryFromInetAddress(sourceAddress));
 438             transportAddressBuilder.setPort(new PortNumber(fromJava(port)));
 439             gotMapReplyBuilder.setTransportAddress(transportAddressBuilder.build());
 440             lispSbPlugin.sendNotificationIfPossible(gotMapReplyBuilder.build());
 441         } catch (RuntimeException re) {
 442             throw new LispMalformedPacketException("Couldn't deserialize Map-Reply (len="
 443                     + inBuffer.capacity() + ")", re);
 444         } catch (InterruptedException e) {
 445             LOG.warn("Notification publication interrupted!");
 446         }
 447     }
 448
 449     private void handleStats(int type) {
 450         if (lispSbPlugin.getStats() != null) {
 451             if (type <= ConcurrentLispSouthboundStats.MAX_LISP_TYPES) {
 452                 lispSbPlugin.getStats().incrementRx(type);
 453             } else {
 454                 lispSbPlugin.getStats().incrementRxUnknown();
 455             }
 456         }
 457     }
 458
 459     @Override
 460     protected void channelRead0(ChannelHandlerContext ctx, DatagramPacket msg) throws Exception {
 461         if (isReadFromChannelEnabled) {
 462             if (LOG.isTraceEnabled()) {
 463                 LOG.trace("Received UDP packet from {}:{} with content:\n{}", msg.sender().getHostString(),
 464                         msg.sender().getPort(), ByteBufUtil.prettyHexDump(msg.content()));
 465             }
 466             this.channel = ctx.channel();
 467             handlePacket(msg);
 468         }
 469     }
 470
 471     @Override
 472     public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
 473         ctx.flush();
 474     }
 475
 476     @Override
 477     public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
 478         LOG.error("Error on channel: " + cause, cause);
 479     }
 480
 481     @Override
 482     public void close() throws Exception {
 483     }
 484 }