bgp/rib-impl/src/main/java/org/opendaylight/protocol/bgp/rib/impl/BGPPeer.java

   1 /*
   2  * Copyright (c) 2014 Cisco Systems, 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 package org.opendaylight.protocol.bgp.rib.impl;
   9
  10 import static org.opendaylight.protocol.bgp.rib.impl.AdjRibInWriter.isAnnounceNone;
  11 import static org.opendaylight.protocol.bgp.rib.impl.AdjRibInWriter.isLearnNone;
  12
  13 import com.google.common.base.MoreObjects;
  14 import com.google.common.base.MoreObjects.ToStringHelper;
  15 import com.google.common.base.Preconditions;
  16 import com.google.common.collect.ImmutableMap;
  17 import com.google.common.net.InetAddresses;
  18 import com.google.common.util.concurrent.Futures;
  19 import com.google.common.util.concurrent.ListenableFuture;
  20 import java.util.ArrayList;
  21 import java.util.Arrays;
  22 import java.util.HashMap;
  23 import java.util.HashSet;
  24 import java.util.List;
  25 import java.util.Map;
  26 import java.util.Optional;
  27 import java.util.Set;
  28 import java.util.stream.Collectors;
  29 import javax.annotation.concurrent.GuardedBy;
  30 import org.opendaylight.controller.config.yang.bgp.rib.impl.BGPPeerRuntimeMXBean;
  31 import org.opendaylight.controller.config.yang.bgp.rib.impl.BGPPeerRuntimeRegistration;
  32 import org.opendaylight.controller.config.yang.bgp.rib.impl.BGPPeerRuntimeRegistrator;
  33 import org.opendaylight.controller.config.yang.bgp.rib.impl.BgpPeerState;
  34 import org.opendaylight.controller.config.yang.bgp.rib.impl.BgpSessionState;
  35 import org.opendaylight.controller.md.sal.common.api.data.AsyncTransaction;
  36 import org.opendaylight.controller.md.sal.common.api.data.TransactionChain;
  37 import org.opendaylight.controller.md.sal.common.api.data.TransactionChainListener;
  38 import org.opendaylight.controller.md.sal.dom.api.DOMTransactionChain;
  39 import org.opendaylight.controller.sal.binding.api.BindingAwareBroker.RoutedRpcRegistration;
  40 import org.opendaylight.controller.sal.binding.api.RpcProviderRegistry;
  41 import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
  42 import org.opendaylight.protocol.bgp.parser.BGPError;
  43 import org.opendaylight.protocol.bgp.parser.impl.message.update.LocalPreferenceAttributeParser;
  44 import org.opendaylight.protocol.bgp.parser.spi.MessageUtil;
  45 import org.opendaylight.protocol.bgp.rib.impl.spi.RIB;
  46 import org.opendaylight.protocol.bgp.rib.impl.spi.RIBSupportContext;
  47 import org.opendaylight.protocol.bgp.rib.impl.stats.peer.BGPPeerStats;
  48 import org.opendaylight.protocol.bgp.rib.impl.stats.peer.BGPPeerStatsImpl;
  49 import org.opendaylight.protocol.bgp.rib.impl.stats.peer.BGPSessionStats;
  50 import org.opendaylight.protocol.bgp.rib.spi.BGPSession;
  51 import org.opendaylight.protocol.bgp.rib.spi.BGPSessionListener;
  52 import org.opendaylight.protocol.bgp.rib.spi.BGPTerminationReason;
  53 import org.opendaylight.protocol.bgp.rib.spi.ExportPolicyPeerTracker;
  54 import org.opendaylight.protocol.bgp.rib.spi.IdentifierUtils;
  55 import org.opendaylight.protocol.bgp.rib.spi.Peer;
  56 import org.opendaylight.protocol.bgp.rib.spi.RouterIds;
  57 import org.opendaylight.protocol.concepts.AbstractRegistration;
  58 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Prefix;
  59 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.ipv4.prefixes.DestinationIpv4Builder;
  60 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.ipv4.prefixes.destination.ipv4.Ipv4Prefixes;
  61 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.ipv4.prefixes.destination.ipv4.Ipv4PrefixesBuilder;
  62 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.update.attributes.mp.reach.nlri.advertized.routes.destination.type.DestinationIpv4CaseBuilder;
  63 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Update;
  64 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.path.attributes.Attributes;
  65 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.path.attributes.AttributesBuilder;
  66 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.BgpAddPathTableType;
  67 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.BgpTableType;
  68 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.RouteRefresh;
  69 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.SendReceive;
  70 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.mp.capabilities.add.path.capability.AddressFamilies;
  71 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.MpReachNlri;
  72 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.MpReachNlriBuilder;
  73 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.MpUnreachNlri;
  74 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.MpUnreachNlriBuilder;
  75 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.mp.reach.nlri.AdvertizedRoutesBuilder;
  76 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.mp.unreach.nlri.WithdrawnRoutesBuilder;
  77 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.peer.rpc.rev160322.BgpPeerRpcService;
  78 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.peer.rpc.rev160322.PeerContext;
  79 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.PeerId;
  80 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.PeerRole;
  81 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.SimpleRoutingPolicy;
  82 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.bgp.rib.rib.PeerKey;
  83 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.rib.TablesKey;
  84 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.AddressFamily;
  85 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.Ipv4AddressFamily;
  86 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.SubsequentAddressFamily;
  87 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.UnicastSubsequentAddressFamily;
  88 import org.opendaylight.yangtools.yang.binding.KeyedInstanceIdentifier;
  89 import org.opendaylight.yangtools.yang.binding.Notification;
  90 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  91 import org.slf4j.Logger;
  92 import org.slf4j.LoggerFactory;
  93
  94 /**
  95  * Class representing a peer. We have a single instance for each peer, which provides translation from BGP events into
  96  * RIB actions.
  97  */
  98 public class BGPPeer implements BGPSessionListener, Peer, BGPPeerRuntimeMXBean, TransactionChainListener {
  99
 100     private static final Logger LOG = LoggerFactory.getLogger(BGPPeer.class);
 101
 102     @GuardedBy("this")
 103     private final Set<TablesKey> tables = new HashSet<>();
 104     @GuardedBy("this")
 105     private BGPSession session;
 106     @GuardedBy("this")
 107     private byte[] rawIdentifier;
 108     @GuardedBy("this")
 109     private DOMTransactionChain chain;
 110     @GuardedBy("this")
 111     private AdjRibInWriter ribWriter;
 112     @GuardedBy("this")
 113     private EffectiveRibInWriter effRibInWriter;
 114
 115     private final RIB rib;
 116     private final String name;
 117     private BGPPeerRuntimeRegistrator registrator;
 118     private BGPPeerRuntimeRegistration runtimeReg;
 119     private final Map<TablesKey, AdjRibOutListener> adjRibOutListenerSet = new HashMap();
 120     private final RpcProviderRegistry rpcRegistry;
 121     private RoutedRpcRegistration<BgpPeerRpcService> rpcRegistration;
 122     private final PeerRole peerRole;
 123     private final Optional<SimpleRoutingPolicy> simpleRoutingPolicy;
 124     private final BGPPeerStats peerStats;
 125     private YangInstanceIdentifier peerIId;
 126     private final Set<AbstractRegistration> tableRegistration = new HashSet<>();
 127
 128     public BGPPeer(final String name, final RIB rib, final PeerRole role, final SimpleRoutingPolicy peerStatus, final RpcProviderRegistry rpcRegistry) {
 129         this.peerRole = role;
 130         this.simpleRoutingPolicy = Optional.ofNullable(peerStatus);
 131         this.rib = Preconditions.checkNotNull(rib);
 132         this.name = name;
 133         this.rpcRegistry = rpcRegistry;
 134         this.peerStats = new BGPPeerStatsImpl(this.name, this.tables);
 135         this.chain = rib.createPeerChain(this);
 136     }
 137
 138     public BGPPeer(final String name, final RIB rib, final PeerRole role, final RpcProviderRegistry rpcRegistry) {
 139         this(name, rib, role, null, rpcRegistry);
 140     }
 141
 142     public void instantiateServiceInstance() {
 143         // add current peer to "configured BGP peer" stats
 144         this.rib.getRenderStats().getConfiguredPeerCounter().increaseCount();
 145         this.ribWriter = AdjRibInWriter.create(this.rib.getYangRibId(), this.peerRole, this.simpleRoutingPolicy, this.chain);
 146     }
 147
 148     // FIXME ListenableFuture<?> should be used once closeServiceInstance uses wildcard too
 149     @Override
 150     public synchronized ListenableFuture<Void> close() {
 151         final ListenableFuture<Void> future = releaseConnection();
 152         this.chain.close();
 153         return future;
 154     }
 155
 156     @Override
 157     public void onMessage(final BGPSession session, final Notification msg) throws BGPDocumentedException {
 158         if (!(msg instanceof Update) && !(msg instanceof RouteRefresh)) {
 159             LOG.info("Ignoring unhandled message class {}", msg.getClass());
 160             return;
 161         }
 162         if (msg instanceof Update) {
 163             onUpdateMessage((Update) msg);
 164         } else {
 165             onRouteRefreshMessage((RouteRefresh) msg, session);
 166         }
 167     }
 168
 169     private void onRouteRefreshMessage(final RouteRefresh message, final BGPSession session) {
 170         final Class<? extends AddressFamily> rrAfi = message.getAfi();
 171         final Class<? extends SubsequentAddressFamily> rrSafi = message.getSafi();
 172
 173         final TablesKey key = new TablesKey(rrAfi, rrSafi);
 174         final AdjRibOutListener listener = this.adjRibOutListenerSet.get(key);
 175         if (listener != null) {
 176             listener.close();
 177             this.adjRibOutListenerSet.remove(key);
 178             createAdjRibOutListener(RouterIds.createPeerId(session.getBgpId()), key, listener.isMpSupported());
 179         } else {
 180             LOG.info("Ignoring RouteRefresh message. Afi/Safi is not supported: {}, {}.", rrAfi, rrSafi);
 181         }
 182     }
 183
 184     /**
 185      * Check for presence of well known mandatory attribute LOCAL_PREF in Update message
 186      *
 187      * @param message Update message
 188      * @throws BGPDocumentedException
 189      */
 190     private void checkMandatoryAttributesPresence(final Update message) throws BGPDocumentedException {
 191         if (MessageUtil.isAnyNlriPresent(message)) {
 192             final Attributes attrs = message.getAttributes();
 193             if (this.peerRole == PeerRole.Ibgp && (attrs == null || attrs.getLocalPref() == null)) {
 194                 throw new BGPDocumentedException(BGPError.MANDATORY_ATTR_MISSING_MSG + "LOCAL_PREF",
 195                         BGPError.WELL_KNOWN_ATTR_MISSING,
 196                         new byte[] { LocalPreferenceAttributeParser.TYPE });
 197             }
 198         }
 199     }
 200
 201     /**
 202      * Process Update message received.
 203      * Calls {@link #checkMandatoryAttributesPresence(Update)} to check for presence of mandatory attributes.
 204      *
 205      * @param message Update message
 206      * @throws BGPDocumentedException
 207      */
 208     private void onUpdateMessage(final Update message) throws BGPDocumentedException {
 209         checkMandatoryAttributesPresence(message);
 210
 211         // update AdjRibs
 212         final Attributes attrs = message.getAttributes();
 213         MpReachNlri mpReach = null;
 214         final boolean isAnyNlriAnnounced = message.getNlri() != null;
 215         if (isAnyNlriAnnounced) {
 216             mpReach = prefixesToMpReach(message);
 217         } else {
 218             mpReach = MessageUtil.getMpReachNlri(attrs);
 219         }
 220         if (mpReach != null) {
 221             this.ribWriter.updateRoutes(mpReach, nextHopToAttribute(attrs, mpReach));
 222         }
 223         MpUnreachNlri mpUnreach = null;
 224         if (message.getWithdrawnRoutes() != null) {
 225             mpUnreach = prefixesToMpUnreach(message, isAnyNlriAnnounced);
 226         } else {
 227             mpUnreach = MessageUtil.getMpUnreachNlri(attrs);
 228         }
 229         if (mpUnreach != null) {
 230             this.ribWriter.removeRoutes(mpUnreach);
 231         }
 232     }
 233
 234     private static Attributes nextHopToAttribute(final Attributes attrs, final MpReachNlri mpReach) {
 235         if (attrs.getCNextHop() == null && mpReach.getCNextHop() != null) {
 236             final AttributesBuilder attributesBuilder = new AttributesBuilder(attrs);
 237             attributesBuilder.setCNextHop(mpReach.getCNextHop());
 238             return attributesBuilder.build();
 239         }
 240         return attrs;
 241     }
 242
 243     /**
 244      * Creates MPReach for the prefixes to be handled in the same way as linkstate routes
 245      *
 246      * @param message Update message containing prefixes in NLRI
 247      * @return MpReachNlri with prefixes from the nlri field
 248      */
 249     private static MpReachNlri prefixesToMpReach(final Update message) {
 250         final List<Ipv4Prefixes> prefixes = new ArrayList<>();
 251         for (final Ipv4Prefix p : message.getNlri().getNlri()) {
 252             prefixes.add(new Ipv4PrefixesBuilder().setPrefix(p).build());
 253         }
 254         final MpReachNlriBuilder b = new MpReachNlriBuilder().setAfi(Ipv4AddressFamily.class).setSafi(
 255                 UnicastSubsequentAddressFamily.class).setAdvertizedRoutes(
 256                         new AdvertizedRoutesBuilder().setDestinationType(
 257                                 new DestinationIpv4CaseBuilder().setDestinationIpv4(
 258                                         new DestinationIpv4Builder().setIpv4Prefixes(prefixes).build()).build()).build());
 259         if (message.getAttributes() != null) {
 260             b.setCNextHop(message.getAttributes().getCNextHop());
 261         }
 262         return b.build();
 263     }
 264
 265     /**
 266      * Create MPUnreach for the prefixes to be handled in the same way as linkstate routes
 267      *
 268      * @param message Update message containing withdrawn routes
 269      * @param isAnyNlriAnnounced
 270      * @return MpUnreachNlri with prefixes from the withdrawn routes field
 271      */
 272     private static MpUnreachNlri prefixesToMpUnreach(final Update message, final boolean isAnyNlriAnnounced) {
 273         final List<Ipv4Prefixes> prefixes = new ArrayList<>();
 274         for (final Ipv4Prefix p : message.getWithdrawnRoutes().getWithdrawnRoutes()) {
 275             boolean nlriAnounced = false;
 276             if(isAnyNlriAnnounced) {
 277                 nlriAnounced = message.getNlri().getNlri().contains(p);
 278             }
 279
 280             if(!nlriAnounced) {
 281                 prefixes.add(new Ipv4PrefixesBuilder().setPrefix(p).build());
 282             }
 283         }
 284         return new MpUnreachNlriBuilder().setAfi(Ipv4AddressFamily.class).setSafi(UnicastSubsequentAddressFamily.class).setWithdrawnRoutes(
 285                 new WithdrawnRoutesBuilder().setDestinationType(
 286                         new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.update.attributes.mp.unreach.nlri.withdrawn.routes.destination.type.DestinationIpv4CaseBuilder().setDestinationIpv4(
 287                                 new DestinationIpv4Builder().setIpv4Prefixes(prefixes).build()).build()).build()).build();
 288     }
 289
 290     @Override
 291     public synchronized void onSessionUp(final BGPSession session) {
 292         final List<AddressFamilies> addPathTablesType = session.getAdvertisedAddPathTableTypes();
 293         final Set<BgpTableType> advertizedTableTypes = session.getAdvertisedTableTypes();
 294         LOG.info("Session with peer {} went up with tables {} and Add Path tables {}", this.name, advertizedTableTypes, addPathTablesType);
 295         this.session = session;
 296
 297         this.rawIdentifier = InetAddresses.forString(session.getBgpId().getValue()).getAddress();
 298         final PeerId peerId = RouterIds.createPeerId(session.getBgpId());
 299
 300         this.tables.addAll(advertizedTableTypes.stream().map(t -> new TablesKey(t.getAfi(), t.getSafi())).collect(Collectors.toList()));
 301         final boolean announceNone = isAnnounceNone(this.simpleRoutingPolicy);
 302         final Map<TablesKey, SendReceive> addPathTableMaps = mapTableTypesFamilies(addPathTablesType);
 303         this.peerIId = this.rib.getYangRibId().node(org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.bgp.rib.rib.Peer.QNAME)
 304             .node(IdentifierUtils.domPeerId(peerId));
 305
 306         if(!announceNone) {
 307             createAdjRibOutListener(peerId);
 308         }
 309         this.tables.forEach(tablesKey -> {
 310             final ExportPolicyPeerTracker exportTracker = this.rib.getExportPolicyPeerTracker(tablesKey);
 311             if (exportTracker != null) {
 312                 this.tableRegistration.add(exportTracker.registerPeer(peerId, addPathTableMaps.get(tablesKey), this.peerIId, this.peerRole,
 313                     this.simpleRoutingPolicy));
 314             }
 315         });
 316         addBgp4Support(peerId, announceNone);
 317
 318         if(!isLearnNone(this.simpleRoutingPolicy)) {
 319             this.effRibInWriter = EffectiveRibInWriter.create(this.rib.getService(), this.rib.createPeerChain(this), this.peerIId,
 320                 this.rib.getImportPolicyPeerTracker(), this.rib.getRibSupportContext(), this.peerRole,
 321                 this.peerStats.getEffectiveRibInRouteCounters(), this.peerStats.getAdjRibInRouteCounters());
 322         }
 323         this.ribWriter = this.ribWriter.transform(peerId, this.rib.getRibSupportContext(), this.tables, addPathTableMaps);
 324
 325         // register BGP Peer stats
 326         this.peerStats.getSessionEstablishedCounter().increaseCount();
 327         if (this.registrator != null) {
 328             this.runtimeReg = this.registrator.register(this);
 329         }
 330
 331         if (this.rpcRegistry != null) {
 332             this.rpcRegistration = this.rpcRegistry.addRoutedRpcImplementation(BgpPeerRpcService.class, new BgpPeerRpc(session, this.tables));
 333             final KeyedInstanceIdentifier<org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.bgp.rib.rib.Peer, PeerKey> path =
 334                     this.rib.getInstanceIdentifier().child(org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.bgp.rib.rib.Peer.class, new PeerKey(peerId));
 335             this.rpcRegistration.registerPath(PeerContext.class, path);
 336         }
 337
 338         this.rib.getRenderStats().getConnectedPeerCounter().increaseCount();
 339     }
 340
 341     private void createAdjRibOutListener(final PeerId peerId) {
 342         this.tables.forEach(key->createAdjRibOutListener(peerId, key, true));
 343     }
 344
 345     //try to add a support for old-school BGP-4, if peer did not advertise IPv4-Unicast MP capability
 346     private void addBgp4Support(final PeerId peerId, final boolean announceNone) {
 347         final TablesKey key = new TablesKey(Ipv4AddressFamily.class, UnicastSubsequentAddressFamily.class);
 348         if (this.tables.add(key) && !announceNone) {
 349             createAdjRibOutListener(peerId, key, false);
 350         }
 351     }
 352
 353     private void createAdjRibOutListener(final PeerId peerId, final TablesKey key, final boolean mpSupport) {
 354         final RIBSupportContext context = this.rib.getRibSupportContext().getRIBSupportContext(key);
 355
 356         // not particularly nice
 357         if (context != null && this.session instanceof BGPSessionImpl) {
 358             this.adjRibOutListenerSet.put(key, AdjRibOutListener.create(peerId, key, this.rib.getYangRibId(), this.rib.getCodecsRegistry(),
 359                 context.getRibSupport(), this.rib.getService(), ((BGPSessionImpl) this.session).getLimiter(), mpSupport,
 360                 this.peerStats.getAdjRibOutRouteCounters().init(key)));
 361         }
 362     }
 363
 364     private ListenableFuture<Void> cleanup() {
 365         // FIXME: BUG-196: support graceful
 366         this.adjRibOutListenerSet.values().forEach(AdjRibOutListener::close);
 367         this.adjRibOutListenerSet.clear();
 368         if (this.effRibInWriter != null) {
 369             this.effRibInWriter.close();
 370         }
 371         this.tables.clear();
 372         if (this.ribWriter != null) {
 373             return this.ribWriter.removePeer();
 374         }
 375         return Futures.immediateFuture(null);
 376     }
 377
 378     @Override
 379     public void onSessionDown(final BGPSession session, final Exception e) {
 380         if(e.getMessage().equals(BGPSessionImpl.END_OF_INPUT)) {
 381             LOG.info("Session with peer {} went down", this.name);
 382         } else {
 383             LOG.info("Session with peer {} went down", this.name, e);
 384         }
 385         releaseConnection();
 386     }
 387
 388     @Override
 389     public void onSessionTerminated(final BGPSession session, final BGPTerminationReason cause) {
 390         LOG.info("Session with peer {} terminated: {}", this.name, cause);
 391         releaseConnection();
 392     }
 393
 394     @Override
 395     public String toString() {
 396         return addToStringAttributes(MoreObjects.toStringHelper(this)).toString();
 397     }
 398
 399     protected ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
 400         toStringHelper.add("name", this.name);
 401         toStringHelper.add("tables", this.tables);
 402         return toStringHelper;
 403     }
 404
 405     @Override
 406     public String getName() {
 407         return this.name;
 408     }
 409
 410     @Override
 411     public synchronized ListenableFuture<Void> releaseConnection() {
 412         if (this.rpcRegistration != null) {
 413             this.rpcRegistration.close();
 414         }
 415         closeRegistration();
 416         final ListenableFuture<Void> future = cleanup();
 417         dropConnection();
 418         return future;
 419     }
 420
 421     private void closeRegistration() {
 422         for (final AbstractRegistration tableCloseable : this.tableRegistration) {
 423             tableCloseable.close();
 424         }
 425         this.tableRegistration.clear();
 426     }
 427
 428     private void dropConnection() {
 429         if (this.runtimeReg != null) {
 430             this.runtimeReg.close();
 431             this.runtimeReg = null;
 432         }
 433         if (this.session != null) {
 434             try {
 435                 this.session.close();
 436             } catch (final Exception e) {
 437                 LOG.warn("Error closing session with peer", e);
 438             }
 439             this.session = null;
 440
 441             this.rib.getRenderStats().getConnectedPeerCounter().decreaseCount();
 442         }
 443     }
 444
 445     @Override
 446     public synchronized byte[] getRawIdentifier() {
 447         return Arrays.copyOf(this.rawIdentifier, this.rawIdentifier.length);
 448     }
 449
 450     @Override
 451     public void resetSession() {
 452         releaseConnection();
 453     }
 454
 455     @Override
 456     public void resetStats() {
 457         if (this.session instanceof BGPSessionStats) {
 458             ((BGPSessionStats) this.session).resetBgpSessionStats();
 459         }
 460     }
 461
 462     @Override
 463     public BgpSessionState getBgpSessionState() {
 464         if (this.session instanceof BGPSessionStats) {
 465             return ((BGPSessionStats) this.session).getBgpSessionState();
 466         }
 467         return new BgpSessionState();
 468     }
 469
 470     @Override
 471     public synchronized BgpPeerState getBgpPeerState() {
 472         return this.peerStats.getBgpPeerState();
 473     }
 474
 475     @Override
 476     public void onTransactionChainFailed(final TransactionChain<?, ?> chain, final AsyncTransaction<?, ?> transaction, final Throwable cause) {
 477         LOG.error("Transaction chain failed.", cause);
 478         this.chain.close();
 479         this.chain = this.rib.createPeerChain(this);
 480         this.ribWriter = AdjRibInWriter.create(this.rib.getYangRibId(), this.peerRole, this.simpleRoutingPolicy, this.chain);
 481         releaseConnection();
 482     }
 483
 484     @Override
 485     public void onTransactionChainSuccessful(final TransactionChain<?, ?> chain) {
 486         LOG.debug("Transaction chain {} successfull.", chain);
 487     }
 488
 489     @Override
 490     public void markUptodate(final TablesKey tablesKey) {
 491         this.ribWriter.markTableUptodate(tablesKey);
 492     }
 493
 494     private static Map<TablesKey, SendReceive> mapTableTypesFamilies(final List<AddressFamilies> addPathTablesType) {
 495         return ImmutableMap.copyOf(addPathTablesType.stream().collect(Collectors.toMap(af -> new TablesKey(af.getAfi(), af.getSafi()),
 496             BgpAddPathTableType::getSendReceive)));
 497     }
 498 }