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

   1 /*
   2  * Copyright (c) 2016 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
   9 package org.opendaylight.protocol.bgp.rib.impl.config;
  10
  11 import static org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IetfInetUtil.INSTANCE;
  12
  13 import com.google.common.collect.ImmutableList;
  14 import java.util.ArrayList;
  15 import java.util.Collections;
  16 import java.util.HashMap;
  17 import java.util.List;
  18 import java.util.Map;
  19 import java.util.Optional;
  20 import java.util.Set;
  21 import java.util.stream.Collectors;
  22 import javax.annotation.Nonnull;
  23 import javax.annotation.Nullable;
  24 import org.opendaylight.protocol.bgp.mode.api.PathSelectionMode;
  25 import org.opendaylight.protocol.bgp.mode.impl.add.all.paths.AllPathSelection;
  26 import org.opendaylight.protocol.bgp.mode.impl.add.n.paths.AddPathBestNPathSelection;
  27 import org.opendaylight.protocol.bgp.openconfig.spi.BGPTableTypeRegistryConsumer;
  28 import org.opendaylight.protocol.bgp.parser.spi.RevisedErrorHandlingSupport;
  29 import org.opendaylight.protocol.bgp.parser.spi.pojo.RevisedErrorHandlingSupportImpl;
  30 import org.opendaylight.protocol.concepts.KeyMapping;
  31 import org.opendaylight.protocol.util.Ipv4Util;
  32 import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.multiprotocol.rev151009.BgpCommonAfiSafiList;
  33 import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.multiprotocol.rev151009.bgp.common.afi.safi.list.AfiSafi;
  34 import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.multiprotocol.rev151009.bgp.common.afi.safi.list.AfiSafiBuilder;
  35 import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.BgpNeighborAddPathsConfig;
  36 import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.BgpNeighborGroup;
  37 import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.BgpNeighborTransportConfig;
  38 import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.graceful.restart.GracefulRestart;
  39 import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.neighbor.group.ErrorHandling;
  40 import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.neighbor.group.RouteReflector;
  41 import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.neighbor.group.Timers;
  42 import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.neighbor.group.Transport;
  43 import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.neighbor.group.transport.Config;
  44 import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.neighbors.Neighbor;
  45 import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.neighbors.NeighborKey;
  46 import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.peer.group.PeerGroup;
  47 import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.top.Bgp;
  48 import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.top.bgp.Neighbors;
  49 import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.types.rev151009.IPV4UNICAST;
  50 import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.types.rev151009.PeerType;
  51 import org.opendaylight.yang.gen.v1.http.openconfig.net.yang.network.instance.rev151018.network.instance.top.network.instances.network.instance.protocols.Protocol;
  52 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.AsNumber;
  53 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress;
  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.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.BgpTableType;
  56 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.SendReceive;
  57 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.mp.capabilities.add.path.capability.AddressFamilies;
  58 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.mp.capabilities.add.path.capability.AddressFamiliesBuilder;
  59 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.openconfig.extensions.rev180329.GlobalAddPathsConfig;
  60 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.openconfig.extensions.rev180329.GlobalConfigAugmentation;
  61 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.openconfig.extensions.rev180329.NeighborAddPathsConfig;
  62 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.openconfig.extensions.rev180329.NeighborPeerGroupConfig;
  63 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.openconfig.extensions.rev180329.NeighborTransportConfig;
  64 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.openconfig.extensions.rev180329.PeerGroupTransportConfig;
  65 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.openconfig.extensions.rev180329.TransportConfig;
  66 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev180329.PeerRole;
  67 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev180329.rib.TablesKey;
  68 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev180329.ClusterIdentifier;
  69 import org.opendaylight.yangtools.yang.binding.Augmentation;
  70 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  71
  72 final class OpenConfigMappingUtil {
  73
  74     static final String APPLICATION_PEER_GROUP_NAME = "application-peers";
  75     static final Optional<String> APPLICATION_PEER_GROUP_NAME_OPT = Optional.of(APPLICATION_PEER_GROUP_NAME);
  76     static final int HOLDTIMER = 90;
  77     private static final AfiSafi IPV4_AFISAFI = new AfiSafiBuilder().setAfiSafiName(IPV4UNICAST.class).build();
  78     private static final List<AfiSafi> DEFAULT_AFISAFI = ImmutableList.of(IPV4_AFISAFI);
  79     private static final int CONNECT_RETRY = 30;
  80     private static final PortNumber PORT = new PortNumber(179);
  81
  82     private OpenConfigMappingUtil() {
  83         throw new UnsupportedOperationException();
  84     }
  85
  86     static String getRibInstanceName(final InstanceIdentifier<?> rootIdentifier) {
  87         return rootIdentifier.firstKeyOf(Protocol.class).getName();
  88     }
  89
  90     static KeyMapping getNeighborKey(final Neighbor neighbor) {
  91         if (neighbor.getConfig() != null) {
  92             final String authPassword = neighbor.getConfig().getAuthPassword();
  93             if (authPassword != null) {
  94                 return KeyMapping.getKeyMapping(INSTANCE.inetAddressFor(neighbor.getNeighborAddress()), authPassword);
  95             }
  96         }
  97         return null;
  98     }
  99
 100     static InstanceIdentifier<Neighbor> getNeighborInstanceIdentifier(
 101             final InstanceIdentifier<Bgp> rootIdentifier,
 102             final NeighborKey neighborKey) {
 103         return rootIdentifier.child(Neighbors.class).child(Neighbor.class, neighborKey);
 104     }
 105
 106     static String getNeighborInstanceName(final InstanceIdentifier<?> rootIdentifier) {
 107         return Ipv4Util.toStringIP(rootIdentifier.firstKeyOf(Neighbor.class).getNeighborAddress());
 108     }
 109
 110     //make sure IPv4 Unicast (RFC 4271) when required
 111     static List<AfiSafi> getAfiSafiWithDefault(
 112             final BgpCommonAfiSafiList afiSAfis, final boolean setDeafultIPv4) {
 113         if (afiSAfis == null || afiSAfis.getAfiSafi() == null) {
 114             return setDeafultIPv4 ? DEFAULT_AFISAFI : Collections.emptyList();
 115         }
 116         final List<AfiSafi> afiSafi = afiSAfis.getAfiSafi();
 117         if (setDeafultIPv4) {
 118             final boolean anyMatch = afiSafi.stream()
 119                     .anyMatch(input -> input.getAfiSafiName().equals(IPV4UNICAST.class));
 120             if (!anyMatch) {
 121                 afiSafi.add(IPV4_AFISAFI);
 122             }
 123         }
 124         return afiSafi;
 125     }
 126
 127     static ClusterIdentifier getGlobalClusterIdentifier(final org.opendaylight.yang.gen.v1.http.openconfig.net
 128             .yang.bgp.rev151009.bgp.global.base.Config globalConfig) {
 129         final GlobalConfigAugmentation globalConfigAugmentation
 130                 = globalConfig.augmentation(GlobalConfigAugmentation.class);
 131         if (globalConfigAugmentation != null && globalConfigAugmentation.getRouteReflectorClusterId() != null) {
 132             return new ClusterIdentifier(globalConfigAugmentation.getRouteReflectorClusterId().getIpv4Address());
 133         }
 134         return new ClusterIdentifier(globalConfig.getRouterId());
 135     }
 136
 137     @Nullable
 138     static ClusterIdentifier getNeighborClusterIdentifier(
 139             @Nullable final RouteReflector routeReflector,
 140             @Nullable final PeerGroup peerGroup) {
 141         if (peerGroup != null) {
 142             final ClusterIdentifier clusteriId = extractClusterId(peerGroup.getRouteReflector());
 143             if (clusteriId != null) {
 144                 return clusteriId;
 145             }
 146         }
 147
 148         return extractClusterId(routeReflector);
 149     }
 150
 151     private static ClusterIdentifier extractClusterId(final RouteReflector routeReflector) {
 152         if (routeReflector != null) {
 153             final org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.neighbor.group.route
 154                     .reflector.Config config = routeReflector.getConfig();
 155             if (config != null && config.getRouteReflectorClusterId() != null) {
 156                 return new ClusterIdentifier(config.getRouteReflectorClusterId().getIpv4Address());
 157             }
 158         }
 159         return null;
 160     }
 161
 162     static Map<BgpTableType, PathSelectionMode> toPathSelectionMode(final List<AfiSafi> afiSafis,
 163             final BGPTableTypeRegistryConsumer tableTypeRegistry) {
 164         final Map<BgpTableType, PathSelectionMode> pathSelectionModes = new HashMap<>();
 165         for (final AfiSafi afiSafi : afiSafis) {
 166             final BgpNeighborAddPathsConfig afiSafi2 = afiSafi.augmentation(GlobalAddPathsConfig.class);
 167             if (afiSafi2 != null) {
 168                 final Optional<BgpTableType> bgpTableType = tableTypeRegistry.getTableType(afiSafi.getAfiSafiName());
 169                 if (bgpTableType.isPresent()) {
 170                     final int sendMax = afiSafi2.getSendMax();
 171                     final PathSelectionMode selectionMode;
 172                     if (sendMax > 1) {
 173                         selectionMode = new AddPathBestNPathSelection(sendMax);
 174                     } else {
 175                         selectionMode = new AllPathSelection();
 176                     }
 177                     pathSelectionModes.put(bgpTableType.get(), selectionMode);
 178                 }
 179             }
 180         }
 181         return pathSelectionModes;
 182     }
 183
 184     static boolean isApplicationPeer(final Neighbor neighbor) {
 185         final org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.neighbor.group
 186                 .Config config = neighbor.getConfig();
 187         if (config != null) {
 188             final NeighborPeerGroupConfig config1 = config.augmentation(NeighborPeerGroupConfig.class);
 189             if (config1 != null) {
 190                 final String peerGroup = config1.getPeerGroup();
 191                 return peerGroup != null && peerGroup.equals(APPLICATION_PEER_GROUP_NAME);
 192             }
 193         }
 194         return false;
 195     }
 196
 197     static List<AddressFamilies> toAddPathCapability(final List<AfiSafi> afiSafis,
 198             final BGPTableTypeRegistryConsumer tableTypeRegistry) {
 199         final List<AddressFamilies> addPathCapability = new ArrayList<>();
 200         for (final AfiSafi afiSafi : afiSafis) {
 201             final BgpNeighborAddPathsConfig afiSafi1 = afiSafi.augmentation(NeighborAddPathsConfig.class);
 202             final Optional<BgpTableType> bgpTableType = tableTypeRegistry.getTableType(afiSafi.getAfiSafiName());
 203             if (afiSafi1 != null && bgpTableType.isPresent()) {
 204                 final AddressFamiliesBuilder builder = new AddressFamiliesBuilder(bgpTableType.get());
 205                 builder.setSendReceive(toSendReceiveMode(afiSafi1));
 206                 addPathCapability.add(builder.build());
 207             }
 208         }
 209         return addPathCapability;
 210     }
 211
 212     private static SendReceive toSendReceiveMode(final BgpNeighborAddPathsConfig addPath) {
 213         if (addPath.isReceive() && addPath.getSendMax() != null) {
 214             return SendReceive.Both;
 215         }
 216         if (addPath.getSendMax() != null) {
 217             return SendReceive.Send;
 218         }
 219         return SendReceive.Receive;
 220     }
 221
 222     private static boolean isRrClient(final BgpNeighborGroup neighbor) {
 223         final RouteReflector routeReflector = neighbor.getRouteReflector();
 224         if (routeReflector != null && routeReflector.getConfig() != null) {
 225             return routeReflector.getConfig().isRouteReflectorClient();
 226         }
 227         return false;
 228     }
 229
 230     static List<BgpTableType> toTableTypes(final List<AfiSafi> afiSafis,
 231             final BGPTableTypeRegistryConsumer tableTypeRegistry) {
 232         return afiSafis.stream()
 233                 .map(afiSafi -> tableTypeRegistry.getTableType(afiSafi.getAfiSafiName()))
 234                 .filter(Optional::isPresent)
 235                 .map(Optional::get)
 236                 .collect(Collectors.toList());
 237     }
 238
 239     static Set<TablesKey> toTableKey(final List<AfiSafi> afiSafis, final BGPTableTypeRegistryConsumer
 240             tableTypeRegistry) {
 241         return afiSafis.stream()
 242                 .map(afiSafi -> tableTypeRegistry.getTableKey(afiSafi.getAfiSafiName()))
 243                 .filter(Optional::isPresent)
 244                 .map(Optional::get)
 245                 .collect(Collectors.toSet());
 246     }
 247
 248     static boolean isActive(final Neighbor neighbor, final PeerGroup peerGroup) {
 249         Boolean activeConnection = null;
 250         if (peerGroup != null) {
 251             activeConnection = isActive(peerGroup.getTransport());
 252         }
 253
 254         if (activeConnection == null) {
 255             activeConnection = isActive(neighbor.getTransport());
 256         }
 257         if (activeConnection == null) {
 258             return true;
 259         }
 260         return activeConnection;
 261     }
 262
 263     @Nullable
 264     private static Boolean isActive(final Transport transport) {
 265         if (transport != null) {
 266             final Config config = transport.getConfig();
 267             if (config != null && config.isPassiveMode() != null) {
 268                 return !config.isPassiveMode();
 269             }
 270         }
 271         return null;
 272     }
 273
 274     static PeerRole toPeerRole(final BgpNeighborGroup neighbor) {
 275         if (isRrClient(neighbor)) {
 276             return PeerRole.RrClient;
 277         }
 278
 279         if (neighbor.getConfig() != null) {
 280             final PeerType peerType = neighbor.getConfig().getPeerType();
 281             if (peerType == PeerType.EXTERNAL) {
 282                 return PeerRole.Ebgp;
 283             } else if (peerType == PeerType.INTERNAL) {
 284                 return PeerRole.Ibgp;
 285             }
 286         }
 287         return null;
 288     }
 289
 290     @Nonnull
 291     static PeerRole toPeerRole(final Neighbor neighbor, final PeerGroup peerGroup) {
 292         PeerRole role = null;
 293         if (peerGroup != null) {
 294             role = toPeerRole(peerGroup);
 295         }
 296
 297         if (role == null) {
 298             role = toPeerRole(neighbor);
 299         }
 300
 301         if (role == null) {
 302             return PeerRole.Ibgp;
 303         }
 304         return role;
 305     }
 306
 307     static int getHoldTimer(final Neighbor neighbor, final PeerGroup peerGroup) {
 308         Integer hold = null;
 309         if (peerGroup != null) {
 310             hold = getHoldTimer(peerGroup.getTimers());
 311         }
 312
 313         if (hold == null) {
 314             hold = getHoldTimer(neighbor.getTimers());
 315         }
 316
 317         if (hold == null) {
 318             return HOLDTIMER;
 319         }
 320
 321         return hold;
 322     }
 323
 324     @Nullable
 325     private static Integer getHoldTimer(final Timers timers) {
 326         if (timers == null) {
 327             return null;
 328         }
 329         final org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.neighbor.group.timers
 330                 .Config config = timers.getConfig();
 331         if (config != null && config.getHoldTime() != null) {
 332             return config.getHoldTime().intValue();
 333         }
 334         return null;
 335     }
 336
 337     static int getGracefulRestartTimer(final Neighbor neighbor, final PeerGroup peerGroup, final int holdTimer) {
 338         Integer timer = null;
 339         if (peerGroup != null) {
 340             timer = getGracefulRestartTimer(peerGroup.getGracefulRestart());
 341         }
 342
 343         if (timer == null) {
 344             timer = getGracefulRestartTimer(neighbor.getGracefulRestart());
 345         }
 346
 347         /*
 348          * RFC4724: "A suggested default for the Restart Time is a value less than or
 349          * equal to the HOLDTIME carried in the OPEN."
 350          */
 351         if (timer == null) {
 352             timer = holdTimer;
 353         }
 354
 355         return timer;
 356     }
 357
 358     @Nullable
 359     private static Integer getGracefulRestartTimer(final GracefulRestart gracefulRestart) {
 360         if (gracefulRestart != null) {
 361             final org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.graceful.restart.graceful
 362                     .restart.Config config = gracefulRestart.getConfig();
 363             if (config != null) {
 364                 return config.getRestartTime();
 365             }
 366         }
 367         return null;
 368     }
 369
 370     @Nonnull
 371     static AsNumber getRemotePeerAs(final org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009
 372             .bgp.neighbor.group.Config config, final PeerGroup peerGroup, final AsNumber localAs) {
 373         AsNumber neighborAs = null;
 374         if (peerGroup != null) {
 375             neighborAs = getRemotePeerAs(peerGroup.getConfig());
 376         }
 377
 378         if (neighborAs == null) {
 379             neighborAs = getRemotePeerAs(config);
 380         }
 381
 382         if (neighborAs == null) {
 383             return localAs;
 384         }
 385         return neighborAs;
 386     }
 387
 388     @Nullable
 389     private static AsNumber getRemotePeerAs(final org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp
 390             .rev151009.bgp.neighbor.group.Config config) {
 391         return config == null ? null : config.getPeerAs();
 392     }
 393
 394     @Nonnull
 395     static AsNumber getLocalPeerAs(@Nullable final org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp
 396             .rev151009.bgp.neighbor.group.Config config, @Nonnull final AsNumber globalAs) {
 397         if (config != null) {
 398             final AsNumber peerAs = config.getLocalAs();
 399             if (peerAs != null) {
 400                 return peerAs;
 401             }
 402         }
 403         return globalAs;
 404     }
 405
 406     static int getRetryTimer(final Neighbor neighbor, final PeerGroup peerGroup) {
 407         Integer retryTimer = null;
 408         if (peerGroup != null) {
 409             retryTimer = getRetryTimer(peerGroup.getTimers());
 410         }
 411
 412         if (retryTimer == null) {
 413             retryTimer = getRetryTimer(neighbor.getTimers());
 414         }
 415
 416         if (retryTimer == null) {
 417             return CONNECT_RETRY;
 418         }
 419
 420         return retryTimer;
 421     }
 422
 423     @Nullable
 424     private static Integer getRetryTimer(final Timers timers) {
 425         if (timers == null) {
 426             return null;
 427         }
 428         final org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.neighbor.group.timers
 429                 .Config config = timers.getConfig();
 430         if (config != null && config.getConnectRetry() != null) {
 431             return config.getConnectRetry().intValue();
 432         }
 433         return null;
 434     }
 435
 436     @Nonnull
 437     static PortNumber getPort(final Neighbor neighbor, final PeerGroup peerGroup) {
 438         PortNumber port = null;
 439         if (peerGroup != null) {
 440             port = getPort(peerGroup.getTransport(), PeerGroupTransportConfig.class);
 441         }
 442
 443         if (port == null) {
 444             port = getPort(neighbor.getTransport(), NeighborTransportConfig.class);
 445         }
 446
 447         if (port == null) {
 448             return PORT;
 449         }
 450
 451         return port;
 452     }
 453
 454     @Nullable
 455     private static <T extends TransportConfig & Augmentation<Config>> PortNumber getPort(
 456             @Nullable final Transport transport, final Class<T> augment) {
 457         if (transport != null) {
 458             final Config config = transport.getConfig();
 459             if (config != null) {
 460                 final T peerTc = config.augmentation(augment);
 461                 if (peerTc != null) {
 462                     return peerTc.getRemotePort();
 463                 }
 464             }
 465         }
 466         return null;
 467     }
 468
 469     @Nullable
 470     static IpAddress getLocalAddress(@Nullable final Transport transport) {
 471         if (transport != null && transport.getConfig() != null) {
 472             final BgpNeighborTransportConfig.LocalAddress localAddress = transport.getConfig().getLocalAddress();
 473             if (localAddress != null) {
 474                 return localAddress.getIpAddress();
 475             }
 476         }
 477         return null;
 478     }
 479
 480     @Nullable
 481     static RevisedErrorHandlingSupport getRevisedErrorHandling(final PeerRole role,final PeerGroup peerGroup,
 482             final Neighbor neighbor) {
 483         Boolean enabled = getRevisedErrorHandling(neighbor);
 484         if (enabled == null) {
 485             enabled = getRevisedErrorHandling(peerGroup);
 486         }
 487         if (!Boolean.TRUE.equals(enabled)) {
 488             return null;
 489         }
 490         switch (role) {
 491             case Ebgp:
 492                 return RevisedErrorHandlingSupportImpl.forExternalPeer();
 493             case Ibgp:
 494             case Internal:
 495             case RrClient:
 496                 return RevisedErrorHandlingSupportImpl.forInternalPeer();
 497             default:
 498                 throw new IllegalStateException("Unhandled role " + role);
 499         }
 500     }
 501
 502     @Nullable
 503     private static @org.eclipse.jdt.annotation.Nullable Boolean getRevisedErrorHandling(final BgpNeighborGroup group) {
 504         if (group == null) {
 505             return null;
 506         }
 507         final ErrorHandling errorHandling = group.getErrorHandling();
 508         if (errorHandling == null) {
 509             return null;
 510         }
 511         final org.opendaylight.yang.gen.v1.http.openconfig.net.yang.bgp.rev151009.bgp.neighbor.group.error.handling
 512             .Config config = errorHandling.getConfig();
 513         return config == null ? null : config.isTreatAsWithdraw();
 514     }
 515 }