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