mappingservice/implementation/src/main/java/org/opendaylight/lispflowmapping/implementation/lisp/MapServer.java

   1 /*
   2  * Copyright (c) 2014, 2017 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.implementation.lisp;
  10
  11 import com.google.common.base.Preconditions;
  12 import com.google.common.collect.Maps;
  13 import com.google.common.collect.Sets;
  14 import com.google.common.util.concurrent.ThreadFactoryBuilder;
  15 import java.net.InetAddress;
  16 import java.net.NetworkInterface;
  17 import java.net.SocketException;
  18 import java.util.ArrayList;
  19 import java.util.Arrays;
  20 import java.util.Enumeration;
  21 import java.util.HashSet;
  22 import java.util.Iterator;
  23 import java.util.List;
  24 import java.util.Map;
  25 import java.util.Objects;
  26 import java.util.Set;
  27 import java.util.concurrent.Executors;
  28 import java.util.concurrent.ScheduledExecutorService;
  29 import java.util.concurrent.ScheduledFuture;
  30 import java.util.concurrent.ThreadFactory;
  31 import java.util.concurrent.TimeUnit;
  32 import org.apache.commons.lang3.BooleanUtils;
  33 import org.opendaylight.controller.md.sal.binding.api.NotificationService;
  34 import org.opendaylight.lispflowmapping.config.ConfigIni;
  35 import org.opendaylight.lispflowmapping.implementation.util.LoggingUtil;
  36 import org.opendaylight.lispflowmapping.implementation.util.MSNotificationInputUtil;
  37 import org.opendaylight.lispflowmapping.interfaces.dao.SubKeys;
  38 import org.opendaylight.lispflowmapping.interfaces.dao.Subscriber;
  39 import org.opendaylight.lispflowmapping.interfaces.lisp.IMapNotifyHandler;
  40 import org.opendaylight.lispflowmapping.interfaces.lisp.IMapServerAsync;
  41 import org.opendaylight.lispflowmapping.interfaces.lisp.ISmrNotificationListener;
  42 import org.opendaylight.lispflowmapping.interfaces.lisp.SmrEvent;
  43 import org.opendaylight.lispflowmapping.interfaces.mappingservice.IMappingService;
  44 import org.opendaylight.lispflowmapping.lisp.authentication.LispAuthenticationUtil;
  45 import org.opendaylight.lispflowmapping.lisp.type.LispMessage;
  46 import org.opendaylight.lispflowmapping.lisp.type.MappingData;
  47 import org.opendaylight.lispflowmapping.lisp.util.LispAddressStringifier;
  48 import org.opendaylight.lispflowmapping.lisp.util.LispAddressUtil;
  49 import org.opendaylight.lispflowmapping.lisp.util.MapNotifyBuilderHelper;
  50 import org.opendaylight.lispflowmapping.lisp.util.MapRequestUtil;
  51 import org.opendaylight.lispflowmapping.lisp.util.MappingRecordUtil;
  52 import org.opendaylight.lispflowmapping.lisp.util.MaskUtil;
  53 import org.opendaylight.lispflowmapping.lisp.util.SourceDestKeyHelper;
  54 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.PortNumber;
  55 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.lisp.address.Address;
  56 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.lisp.address.address.SourceDestKey;
  57 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.inet.binary.types.rev160303.IpAddressBinary;
  58 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.binary.address.types.rev160504.augmented.lisp.address.address.Ipv4PrefixBinary;
  59 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.binary.address.types.rev160504.augmented.lisp.address.address.Ipv4PrefixBinaryBuilder;
  60 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.binary.address.types.rev160504.augmented.lisp.address.address.Ipv6PrefixBinary;
  61 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.binary.address.types.rev160504.augmented.lisp.address.address.Ipv6PrefixBinaryBuilder;
  62 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.MapRegister;
  63 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.SiteId;
  64 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.eid.container.Eid;
  65 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.eid.container.EidBuilder;
  66 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.eid.list.EidItem;
  67 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.eid.list.EidItemBuilder;
  68 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.mapnotifymessage.MapNotifyBuilder;
  69 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.mapping.authkey.container.MappingAuthkey;
  70 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.mapping.record.container.MappingRecord;
  71 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.mapping.record.list.MappingRecordItem;
  72 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.mapping.record.list.MappingRecordItemBuilder;
  73 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.maprequestnotification.MapRequestBuilder;
  74 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.transport.address.TransportAddress;
  75 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.transport.address.TransportAddressBuilder;
  76 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.mappingservice.rev150906.MappingChanged;
  77 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.mappingservice.rev150906.MappingOrigin;
  78 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.mappingservice.rev150906.OdlMappingserviceListener;
  79 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  80 import org.slf4j.Logger;
  81 import org.slf4j.LoggerFactory;
  82
  83 public class MapServer implements IMapServerAsync, OdlMappingserviceListener, ISmrNotificationListener {
  84
  85     private static final Logger LOG = LoggerFactory.getLogger(MapServer.class);
  86     private static final byte[] ALL_ZEROES_XTR_ID = new byte[] {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ,0};
  87     private IMappingService mapService;
  88     private boolean subscriptionService;
  89     private IMapNotifyHandler notifyHandler;
  90     private NotificationService notificationService;
  91     private ListenerRegistration<MapServer> mapServerListenerRegistration;
  92     private SmrScheduler scheduler;
  93
  94     public MapServer(IMappingService mapService, boolean subscriptionService,
  95                      IMapNotifyHandler notifyHandler, NotificationService notificationService) {
  96         Preconditions.checkNotNull(mapService);
  97         this.mapService = mapService;
  98         this.subscriptionService = subscriptionService;
  99         this.notifyHandler = notifyHandler;
 100         this.notificationService = notificationService;
 101         if (notificationService != null) {
 102             notificationService.registerNotificationListener(this);
 103         }
 104         scheduler = new SmrScheduler();
 105     }
 106
 107     @Override
 108     public void setSubscriptionService(boolean subscriptionService) {
 109         this.subscriptionService = subscriptionService;
 110     }
 111
 112     @SuppressWarnings("unchecked")
 113     public void handleMapRegister(MapRegister mapRegister) {
 114         boolean mappingUpdated = false;
 115         boolean merge = ConfigIni.getInstance().mappingMergeIsSet() && mapRegister.isMergeEnabled();
 116         Set<Subscriber> subscribers = Sets.newConcurrentHashSet();
 117         MappingRecord oldMapping;
 118
 119         if (merge) {
 120             if (!mapRegister.isXtrSiteIdPresent() || mapRegister.getXtrId() == null) {
 121                 LOG.error("Merge bit is set in Map-Register, but xTR-ID is not present. Will not merge.");
 122                 merge = false;
 123             } else if (Arrays.equals(mapRegister.getXtrId().getValue(), ALL_ZEROES_XTR_ID)) {
 124                 LOG.warn("Merge bit is set in Map-Register, but xTR-ID is all zeroes.");
 125             }
 126         }
 127
 128         for (MappingRecordItem record : mapRegister.getMappingRecordItem()) {
 129             MappingRecord mapping = record.getMappingRecord();
 130             Eid eid = mapping.getEid();
 131             MappingData mappingData = new MappingData(mapping, System.currentTimeMillis());
 132             mappingData.setMergeEnabled(merge);
 133             mappingData.setXtrId(mapRegister.getXtrId());
 134
 135             oldMapping = getMappingRecord(mapService.getMapping(MappingOrigin.Southbound, eid));
 136             mapService.addMapping(MappingOrigin.Southbound, eid, getSiteId(mapRegister), mappingData);
 137             if (oldMapping != null
 138                     && MappingRecordUtil.isNegativeMapping(oldMapping)
 139                     && !oldMapping.getEid().equals(eid)) {
 140                 if (subscriptionService) {
 141                     // Here we save the subscribers of the OLD mapping before removing. We will add to this set the
 142                     // subscribers of the NEW mapping below (since the EIDs are different, the result of
 143                     // mappingChanged() will be true, and then send an SMR to all subscribers with the EID of the NEW
 144                     // mapping only.
 145                     Set<Subscriber> oldMappingSubscribers = mapService.getSubscribers(oldMapping.getEid());
 146                     if (oldMappingSubscribers != null) {
 147                         subscribers.addAll(oldMappingSubscribers);
 148                         LoggingUtil.logSubscribers(LOG, oldMapping.getEid(), subscribers);
 149                     }
 150                 }
 151                 mapService.removeMapping(MappingOrigin.Southbound, oldMapping.getEid());
 152             }
 153
 154             if (subscriptionService) {
 155                 MappingRecord newMapping = merge
 156                         ? getMappingRecord(mapService.getMapping(MappingOrigin.Southbound, eid)) : mapping;
 157
 158                 if (mappingChanged(oldMapping, newMapping)) {
 159                     if (LOG.isDebugEnabled()) {
 160                         LOG.debug("Mapping update occured for {} SMRs will be sent for its subscribers.",
 161                                 LispAddressStringifier.getString(eid));
 162                     }
 163                     Set<Subscriber> newMappingSubscribers = mapService.getSubscribers(eid);
 164                     if (oldMapping != null && !oldMapping.getEid().equals(eid)) {
 165                         newMappingSubscribers = addParentSubscribers(eid, newMappingSubscribers);
 166                     }
 167                     if (newMappingSubscribers != null) {
 168                         subscribers.addAll(newMappingSubscribers);
 169                         LoggingUtil.logSubscribers(LOG, eid, subscribers);
 170                     }
 171                     handleSmr(eid, subscribers);
 172                     mappingUpdated = true;
 173                 }
 174             }
 175         }
 176         if (BooleanUtils.isTrue(mapRegister.isWantMapNotify())) {
 177             LOG.trace("MapRegister wants MapNotify");
 178             MapNotifyBuilder builder = new MapNotifyBuilder();
 179             List<TransportAddress> rlocs = null;
 180             if (merge) {
 181                 Set<IpAddressBinary> notifyRlocs = new HashSet<IpAddressBinary>();
 182                 List<MappingRecordItem> mergedMappings = new ArrayList<MappingRecordItem>();
 183                 for (MappingRecordItem record : mapRegister.getMappingRecordItem()) {
 184                     MappingRecord mapping = record.getMappingRecord();
 185                     MappingRecord currentRecord = getMappingRecord(mapService.getMapping(MappingOrigin.Southbound,
 186                             mapping.getEid()));
 187                     mergedMappings.add(new MappingRecordItemBuilder().setMappingRecord(currentRecord).build());
 188                     Set<IpAddressBinary> sourceRlocs = (Set<IpAddressBinary>) mapService.getData(
 189                             MappingOrigin.Southbound, mapping.getEid(), SubKeys.SRC_RLOCS);
 190                     if (sourceRlocs != null) {
 191                         notifyRlocs.addAll(sourceRlocs);
 192                     }
 193                 }
 194                 MapNotifyBuilderHelper.setFromMapRegisterAndMappingRecordItems(builder, mapRegister, mergedMappings);
 195                 // send map-notify to merge group only when mapping record is changed
 196                 if (mappingUpdated) {
 197                     rlocs = getTransportAddresses(notifyRlocs);
 198                 }
 199             } else {
 200                 MapNotifyBuilderHelper.setFromMapRegister(builder, mapRegister);
 201             }
 202             List<MappingRecordItem> mappings = builder.getMappingRecordItem();
 203             if (mappings != null && mappings.get(0) != null && mappings.get(0).getMappingRecord() != null
 204                     && mappings.get(0).getMappingRecord().getEid() != null) {
 205                 MappingAuthkey authkey = mapService.getAuthenticationKey(mappings.get(0).getMappingRecord().getEid());
 206                 if (authkey != null) {
 207                     builder.setAuthenticationData(LispAuthenticationUtil.createAuthenticationData(builder.build(),
 208                             authkey.getKeyString()));
 209                 }
 210             }
 211             notifyHandler.handleMapNotify(builder.build(), rlocs);
 212         }
 213     }
 214
 215     private static List<TransportAddress> getTransportAddresses(Set<IpAddressBinary> addresses) {
 216         List<TransportAddress> rlocs = new ArrayList<TransportAddress>();
 217         for (IpAddressBinary address : addresses) {
 218             TransportAddressBuilder tab = new TransportAddressBuilder();
 219             tab.setIpAddress(address);
 220             tab.setPort(new PortNumber(LispMessage.PORT_NUM));
 221             rlocs.add(tab.build());
 222         }
 223         return rlocs;
 224     }
 225
 226     private static SiteId getSiteId(MapRegister mapRegister) {
 227         return (mapRegister.getSiteId() != null) ? new SiteId(mapRegister.getSiteId()) : null;
 228     }
 229
 230     private static MappingRecord getMappingRecord(MappingData mappingData) {
 231         return (mappingData != null) ? mappingData.getRecord() : null;
 232     }
 233
 234     @Override
 235     public void onMappingChanged(MappingChanged notification) {
 236         LOG.trace("MappingChanged event of type: `{}'", notification.getChangeType());
 237         if (subscriptionService) {
 238             Eid eid = notification.getMappingRecord().getEid();
 239             Set<Subscriber> subscribers = MSNotificationInputUtil.toSubscriberSet(notification.getSubscriberItem());
 240             LoggingUtil.logSubscribers(LOG, eid, subscribers);
 241             if (mapService.isMaster()) {
 242                 sendSmrs(eid, subscribers);
 243                 if (eid.getAddress() instanceof SourceDestKey) {
 244                     Set<Subscriber> dstSubscribers = MSNotificationInputUtil.toSubscriberSetFromDst(
 245                             notification.getDstSubscriberItem());
 246                     LoggingUtil.logSubscribers(LOG, SourceDestKeyHelper.getDstBinary(eid), dstSubscribers);
 247                     sendSmrs(SourceDestKeyHelper.getDstBinary(eid), dstSubscribers);
 248                 }
 249             }
 250         }
 251     }
 252
 253     private static boolean mappingChanged(MappingRecord oldMapping, MappingRecord newMapping) {
 254         // We only check for fields we care about
 255         // XXX: This code needs to be checked and updated when the YANG model for MappingRecord is modified
 256         Preconditions.checkNotNull(newMapping, "The new mapping should never be null");
 257         if (oldMapping == null) {
 258             LOG.trace("mappingChanged(): old mapping is null");
 259             return true;
 260         } else if (!Objects.equals(oldMapping.getEid(), newMapping.getEid())) {
 261             LOG.trace("mappingChanged(): EID");
 262             return true;
 263         } else if (!Objects.equals(oldMapping.getLocatorRecord(), newMapping.getLocatorRecord())) {
 264             LOG.trace("mappingChanged(): RLOC");
 265             return true;
 266         } else if (!Objects.equals(oldMapping.getAction(), newMapping.getAction())) {
 267             LOG.trace("mappingChanged(): action");
 268             return true;
 269         } else if (!Objects.equals(oldMapping.getRecordTtl(), newMapping.getRecordTtl())) {
 270             LOG.trace("mappingChanged(): TTL");
 271             return true;
 272         } else if (!Objects.equals(oldMapping.getMapVersion(), newMapping.getMapVersion())) {
 273             LOG.trace("mappingChanged(): mapping version");
 274             return true;
 275         }
 276         return false;
 277     }
 278
 279     private void handleSmr(Eid eid, Set<Subscriber> subscribers) {
 280         sendSmrs(eid, subscribers);
 281
 282         // For SrcDst LCAF also send SMRs to Dst prefix
 283         if (eid.getAddress() instanceof SourceDestKey) {
 284             Eid dstAddr = SourceDestKeyHelper.getDstBinary(eid);
 285             Set<Subscriber> dstSubs = mapService.getSubscribers(dstAddr);
 286             sendSmrs(dstAddr, dstSubs);
 287         }
 288     }
 289
 290     private void sendSmrs(Eid eid, Set<Subscriber> subscribers) {
 291         if (subscribers == null) {
 292             return;
 293         }
 294         final MapRequestBuilder mrb = MapRequestUtil.prepareSMR(eid, LispAddressUtil.toRloc(getLocalAddress()));
 295         LOG.trace("Built SMR packet: " + mrb.build().toString());
 296
 297         scheduler.scheduleSmrs(mrb, subscribers.iterator());
 298     }
 299
 300     private Set<Subscriber> addParentSubscribers(Eid eid, Set<Subscriber> subscribers) {
 301         Eid parentPrefix = mapService.getParentPrefix(eid);
 302         if (parentPrefix == null) {
 303             return subscribers;
 304         }
 305
 306         Set<Subscriber> parentSubscribers = mapService.getSubscribers(parentPrefix);
 307         if (parentSubscribers != null) {
 308             if (subscribers != null) {
 309                 subscribers.addAll(parentSubscribers);
 310             } else {
 311                 subscribers = parentSubscribers;
 312             }
 313         }
 314         return subscribers;
 315     }
 316
 317     private static InetAddress getLocalAddress() {
 318         try {
 319             Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
 320             while (interfaces.hasMoreElements()) {
 321                 NetworkInterface current = interfaces.nextElement();
 322                 LOG.trace("Interface " + current.toString());
 323                 if (!current.isUp() || current.isLoopback() || current.isVirtual()) {
 324                     continue;
 325                 }
 326                 Enumeration<InetAddress> addresses = current.getInetAddresses();
 327                 while (addresses.hasMoreElements()) {
 328                     InetAddress currentAddr = addresses.nextElement();
 329                     // Skip loopback and link local addresses
 330                     if (currentAddr.isLoopbackAddress() || currentAddr.isLinkLocalAddress()) {
 331                         continue;
 332                     }
 333                     LOG.debug(currentAddr.getHostAddress());
 334                     return currentAddr;
 335                 }
 336             }
 337         } catch (SocketException se) {
 338             LOG.debug("Caught socket exception", se);
 339         }
 340         return null;
 341     }
 342
 343     @Override
 344     public void onSmrInvokedReceived(SmrEvent event) {
 345         scheduler.smrReceived(event);
 346     }
 347
 348     /**
 349      * Task scheduler is responsible for resending SMR messages to a subscriber (xTR)
 350      * {@value ConfigIni#LISP_SMR_RETRY_COUNT} times, or until {@link ISmrNotificationListener#onSmrInvokedReceived}
 351      * is triggered.
 352      */
 353     private class SmrScheduler {
 354         final int cpuCores = Runtime.getRuntime().availableProcessors();
 355         private final ThreadFactory threadFactory = new ThreadFactoryBuilder()
 356                 .setNameFormat("smr-executor-%d").build();
 357         private final ScheduledExecutorService executor = Executors.newScheduledThreadPool(cpuCores * 2, threadFactory);
 358         private final Map<Eid, Map<Subscriber, ScheduledFuture<?>>> eidFutureMap = Maps.newConcurrentMap();
 359
 360         void scheduleSmrs(MapRequestBuilder mrb, Iterator<Subscriber> subscribers) {
 361             final Eid srcEid = fixSrcEidMask(mrb.getSourceEid().getEid());
 362             cancelExistingFuturesForEid(srcEid);
 363
 364             final Map<Subscriber, ScheduledFuture<?>> subscriberFutureMap = Maps.newConcurrentMap();
 365
 366             // Using Iterator ensures that we don't get a ConcurrentModificationException when removing a Subscriber
 367             // from a Set.
 368             while (subscribers.hasNext()) {
 369                 Subscriber subscriber = subscribers.next();
 370                 if (subscriber.timedOut()) {
 371                     LOG.debug("Lazy removing expired subscriber entry " + subscriber.getString());
 372                     subscribers.remove();
 373                 } else {
 374                     final ScheduledFuture<?> future = executor.scheduleAtFixedRate(new CancellableRunnable(
 375                             mrb, subscriber), 0L, ConfigIni.getInstance().getSmrTimeout(), TimeUnit.MILLISECONDS);
 376                     subscriberFutureMap.put(subscriber, future);
 377                 }
 378             }
 379
 380             if (subscriberFutureMap.isEmpty()) {
 381                 return;
 382             }
 383             eidFutureMap.put(srcEid, subscriberFutureMap);
 384         }
 385
 386         void smrReceived(SmrEvent event) {
 387             final List<Subscriber> subscriberList = event.getSubscriberList();
 388             for (Subscriber subscriber : subscriberList) {
 389                 if (LOG.isTraceEnabled()) {
 390                     LOG.trace("SMR-invoked event, EID {}, subscriber {}",
 391                             LispAddressStringifier.getString(event.getEid()),
 392                             subscriber.getString());
 393                     LOG.trace("eidFutureMap: {}", eidFutureMap);
 394                 }
 395                 final Map<Subscriber, ScheduledFuture<?>> subscriberFutureMap = eidFutureMap.get(event.getEid());
 396                 if (subscriberFutureMap != null) {
 397                     final ScheduledFuture<?> future = subscriberFutureMap.get(subscriber);
 398                     if (future != null && !future.isCancelled()) {
 399                         future.cancel(true);
 400                         if (LOG.isDebugEnabled()) {
 401                             LOG.debug("SMR-invoked MapRequest received, scheduled task for subscriber {}, EID {} with"
 402                                     + " nonce {} has been cancelled", subscriber.getString(),
 403                                     LispAddressStringifier.getString(event.getEid()), event.getNonce());
 404                         }
 405                         subscriberFutureMap.remove(subscriber);
 406                     } else {
 407                         if (future == null) {
 408                             LOG.trace("No outstanding SMR tasks for EID {}, subscriber {}",
 409                                     LispAddressStringifier.getString(event.getEid()), subscriber.getString());
 410                         } else {
 411                             LOG.trace("Future {} is cancelled", future);
 412                         }
 413                     }
 414                     if (subscriberFutureMap.isEmpty()) {
 415                         eidFutureMap.remove(event.getEid());
 416                     }
 417                 } else {
 418                     if (LOG.isTraceEnabled()) {
 419                         LOG.trace("No outstanding SMR tasks for EID {}",
 420                                 LispAddressStringifier.getString(event.getEid()));
 421                     }
 422                 }
 423             }
 424         }
 425
 426         private void cancelExistingFuturesForEid(Eid eid) {
 427             synchronized (eidFutureMap) {
 428                 if (eidFutureMap.containsKey(eid)) {
 429                     final Map<Subscriber, ScheduledFuture<?>> subscriberFutureMap = eidFutureMap.get(eid);
 430                     Iterator<Subscriber> oldSubscribers = subscriberFutureMap.keySet().iterator();
 431                     while (oldSubscribers.hasNext()) {
 432                         Subscriber subscriber = oldSubscribers.next();
 433                         ScheduledFuture<?> subscriberFuture = subscriberFutureMap.get(subscriber);
 434                         subscriberFuture.cancel(true);
 435                     }
 436                     eidFutureMap.remove(eid);
 437                 }
 438             }
 439         }
 440
 441         /*
 442          * See https://bugs.opendaylight.org/show_bug.cgi?id=8469#c1 why this is necessary.
 443          *
 444          * TL;DR  The sourceEid field in the MapRequestBuilder object will be serialized to a packet on the wire, and
 445          * a Map-Request can't store the prefix length in the source EID.
 446          *
 447          * Since we store all prefixes as binary internally, we only care about and fix those address types.
 448          */
 449         private Eid fixSrcEidMask(Eid eid) {
 450             Address address = eid.getAddress();
 451             if (address instanceof Ipv4PrefixBinary) {
 452                 return new EidBuilder(eid).setAddress(new Ipv4PrefixBinaryBuilder((Ipv4PrefixBinary) address)
 453                         .setIpv4MaskLength(MaskUtil.IPV4_MAX_MASK).build()).build();
 454             } else if (address instanceof Ipv6PrefixBinary) {
 455                 return new EidBuilder(eid).setAddress(new Ipv6PrefixBinaryBuilder((Ipv6PrefixBinary) address)
 456                         .setIpv6MaskLength(MaskUtil.IPV6_MAX_MASK).build()).build();
 457             }
 458             return eid;
 459         }
 460
 461         private final class CancellableRunnable implements Runnable {
 462             private MapRequestBuilder mrb;
 463             private Subscriber subscriber;
 464             private int executionCount = 1;
 465
 466             CancellableRunnable(MapRequestBuilder mrb, Subscriber subscriber) {
 467                 this.mrb = mrb;
 468                 this.subscriber = subscriber;
 469             }
 470
 471             @SuppressWarnings("checkstyle:IllegalCatch")
 472             @Override
 473             public void run() {
 474                 final Eid srcEid = mrb.getSourceEid().getEid();
 475
 476                 try {
 477                     // The address stored in the SMR's EID record is used as Source EID in the SMR-invoked
 478                     // Map-Request. To ensure consistent behavior it is set to the value used to originally request
 479                     // a given mapping.
 480                     if (executionCount <= ConfigIni.getInstance().getSmrRetryCount()) {
 481                         synchronized (mrb) {
 482                             mrb.setEidItem(new ArrayList<EidItem>());
 483                             mrb.getEidItem().add(new EidItemBuilder().setEid(subscriber.getSrcEid()).build());
 484                             notifyHandler.handleSMR(mrb.build(), subscriber.getSrcRloc());
 485                             if (LOG.isTraceEnabled()) {
 486                                 LOG.trace("Attempt #{} to send SMR to subscriber {} for EID {}",
 487                                         executionCount,
 488                                         subscriber.getString(),
 489                                         LispAddressStringifier.getString(mrb.getSourceEid().getEid()));
 490                             }
 491                         }
 492                     } else {
 493                         LOG.trace("Cancelling execution of a SMR Map-Request after {} failed attempts.",
 494                                 executionCount - 1);
 495                         cancelAndRemove(subscriber, srcEid);
 496                         return;
 497                     }
 498                 } catch (Exception e) {
 499                     LOG.error("Errors encountered while handling SMR:", e);
 500                     cancelAndRemove(subscriber, srcEid);
 501                     return;
 502                 }
 503                 executionCount++;
 504             }
 505
 506             private void cancelAndRemove(Subscriber sub, Eid eid) {
 507                 final Map<Subscriber, ScheduledFuture<?>> subscriberFutureMap = eidFutureMap.get(eid);
 508                 if (subscriberFutureMap == null) {
 509                     LOG.warn("Couldn't find subscriber {} in SMR scheduler internal list", sub);
 510                     return;
 511                 }
 512
 513                 if (subscriberFutureMap.containsKey(sub)) {
 514                     ScheduledFuture<?> eidFuture = subscriberFutureMap.get(sub);
 515                     subscriberFutureMap.remove(sub);
 516                     eidFuture.cancel(false);
 517                 }
 518                 if (subscriberFutureMap.isEmpty()) {
 519                     eidFutureMap.remove(eid);
 520                 }
 521             }
 522         }
 523     }
 524 }