elanmanager/impl/src/main/java/org/opendaylight/netvirt/elan/utils/TransportZoneNotificationUtil.java

   1 /*
   2  * Copyright (c) 2017 HPE 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.netvirt.elan.utils;
   9
  10 import static org.opendaylight.genius.infra.Datastore.CONFIGURATION;
  11
  12 import com.google.common.base.Optional;
  13 import com.google.common.collect.MapDifference;
  14 import com.google.common.collect.MapDifference.ValueDifference;
  15 import com.google.common.collect.Maps;
  16 import java.math.BigInteger;
  17 import java.util.ArrayList;
  18 import java.util.Collections;
  19 import java.util.HashSet;
  20 import java.util.List;
  21 import java.util.Map;
  22 import java.util.Map.Entry;
  23 import java.util.Set;
  24 import java.util.concurrent.ExecutionException;
  25 import java.util.stream.Collectors;
  26 import javax.annotation.Nonnull;
  27 import javax.annotation.Nullable;
  28 import javax.inject.Inject;
  29 import javax.inject.Singleton;
  30 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  31 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  32 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  33 import org.opendaylight.genius.datastoreutils.SingleTransactionDataBroker;
  34 import org.opendaylight.genius.infra.Datastore.Configuration;
  35 import org.opendaylight.genius.infra.ManagedNewTransactionRunner;
  36 import org.opendaylight.genius.infra.ManagedNewTransactionRunnerImpl;
  37 import org.opendaylight.genius.infra.TypedReadTransaction;
  38 import org.opendaylight.genius.infra.TypedReadWriteTransaction;
  39 import org.opendaylight.genius.infra.TypedWriteTransaction;
  40 import org.opendaylight.infrautils.utils.concurrent.ListenableFutures;
  41 import org.opendaylight.netvirt.elan.cache.ElanInstanceCache;
  42 import org.opendaylight.netvirt.elan.internal.ElanBridgeManager;
  43 import org.opendaylight.netvirt.elanmanager.api.IElanService;
  44 import org.opendaylight.ovsdb.utils.mdsal.utils.MdsalUtils;
  45 import org.opendaylight.ovsdb.utils.southbound.utils.SouthboundUtils;
  46 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress;
  47 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddressBuilder;
  48 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpPrefix;
  49 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpPrefixBuilder;
  50 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.meta.rev160406.BridgeRefInfo;
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.meta.rev160406.bridge.ref.info.BridgeRefEntry;
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.meta.rev160406.bridge.ref.info.BridgeRefEntryKey;
  53 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.rev160406.TunnelTypeVxlan;
  54 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.DpnEndpoints;
  55 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.dpn.endpoints.DPNTEPsInfo;
  56 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.dpn.endpoints.DPNTEPsInfoKey;
  57 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.dpn.endpoints.dpn.teps.info.TunnelEndPoints;
  58 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.dpn.endpoints.dpn.teps.info.tunnel.end.points.TzMembership;
  59 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.TransportZones;
  60 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.TransportZone;
  61 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.TransportZoneBuilder;
  62 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.TransportZoneKey;
  63 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.transport.zone.Subnets;
  64 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.transport.zone.SubnetsBuilder;
  65 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.transport.zone.SubnetsKey;
  66 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.transport.zone.subnets.Vteps;
  67 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.transport.zone.subnets.VtepsBuilder;
  68 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.transport.zone.subnets.VtepsKey;
  69 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.elan.config.rev150710.ElanConfig;
  70 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.elan.rev150602.elan.interfaces.ElanInterface;
  71 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.l3vpn.rev130911.vpn.instance.op.data.vpn.instance.op.data.entry.vpn.to.dpn.list.VpnInterfaces;
  72 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
  73 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  74 import org.slf4j.Logger;
  75 import org.slf4j.LoggerFactory;
  76
  77 @Singleton
  78 public class TransportZoneNotificationUtil {
  79     private static final Logger LOG = LoggerFactory.getLogger(TransportZoneNotificationUtil.class);
  80     private static final String TUNNEL_PORT = "tunnel_port";
  81     private static final String LOCAL_IP = "local_ip";
  82     private static final String LOCAL_IPS = "local_ips";
  83     private static final char IP_NETWORK_ZONE_NAME_DELIMITER = '-';
  84     private static final String ALL_SUBNETS_GW = "0.0.0.0";
  85     private static final String ALL_SUBNETS = "0.0.0.0/0";
  86     private final ManagedNewTransactionRunner txRunner;
  87     private final SingleTransactionDataBroker singleTxBroker;
  88     private final SouthboundUtils southBoundUtils;
  89     private final IElanService elanService;
  90     private final ElanConfig elanConfig;
  91     private final ElanBridgeManager elanBridgeManager;
  92     private final ElanInstanceCache elanInstanceCache;
  93
  94     @Inject
  95     public TransportZoneNotificationUtil(final DataBroker dbx,
  96             final IElanService elanService, final ElanConfig elanConfig, final ElanBridgeManager elanBridgeManager,
  97             final ElanInstanceCache elanInstanceCache) {
  98         this.txRunner = new ManagedNewTransactionRunnerImpl(dbx);
  99         this.singleTxBroker = new SingleTransactionDataBroker(dbx);
 100         this.elanService = elanService;
 101         this.elanConfig = elanConfig;
 102         this.elanBridgeManager = elanBridgeManager;
 103         this.elanInstanceCache = elanInstanceCache;
 104         southBoundUtils = new SouthboundUtils(new MdsalUtils(dbx));
 105     }
 106
 107     public boolean shouldCreateVtep(List<VpnInterfaces> vpnInterfaces) {
 108         if (vpnInterfaces == null || vpnInterfaces.isEmpty()) {
 109             return false;
 110         }
 111
 112         for (VpnInterfaces vpnInterface : vpnInterfaces) {
 113             String interfaceName = vpnInterface.getInterfaceName();
 114
 115             ElanInterface elanInt = elanService.getElanInterfaceByElanInterfaceName(interfaceName);
 116             if (elanInt == null) {
 117                 continue;
 118             }
 119
 120             if (ElanUtils.isVxlanNetworkOrVxlanSegment(
 121                     elanInstanceCache.get(elanInt.getElanInstanceName()).orNull())) {
 122                 return true;
 123             } else {
 124                 LOG.debug("Non-VXLAN elanInstance: {}", elanInt.getElanInstanceName());
 125             }
 126         }
 127
 128         return false;
 129     }
 130
 131     private TransportZone createZone(String subnetIp, String zoneName) {
 132         List<Subnets> subnets = new ArrayList<>();
 133         subnets.add(buildSubnets(subnetIp));
 134         TransportZoneBuilder tzb = new TransportZoneBuilder().withKey(new TransportZoneKey(zoneName))
 135                 .setTunnelType(TunnelTypeVxlan.class).setZoneName(zoneName).setSubnets(subnets);
 136         return tzb.build();
 137     }
 138
 139     private void updateTransportZone(TransportZone zone, BigInteger dpnId,
 140             @Nonnull TypedWriteTransaction<Configuration> tx) {
 141         InstanceIdentifier<TransportZone> path = InstanceIdentifier.builder(TransportZones.class)
 142                 .child(TransportZone.class, new TransportZoneKey(zone.getZoneName())).build();
 143
 144         tx.merge(path, zone);
 145         LOG.info("Transport zone {} updated due to dpn {} handling.", zone.getZoneName(), dpnId);
 146     }
 147
 148     public void updateTransportZone(String zoneNamePrefix, BigInteger dpnId) {
 149         ListenableFutures.addErrorLogging(txRunner.callWithNewReadWriteTransactionAndSubmit(CONFIGURATION, tx -> {
 150             Map<String, String> localIps = getDpnLocalIps(dpnId);
 151             if (!localIps.isEmpty()) {
 152                 LOG.debug("Will use local_ips for transport zone update for dpn {} and zone name prefix {}", dpnId,
 153                         zoneNamePrefix);
 154                 for (Entry<String, String> entry : localIps.entrySet()) {
 155                     String localIp = entry.getKey();
 156                     String underlayNetworkName = entry.getValue();
 157                     String zoneName = getTzNameForUnderlayNetwork(zoneNamePrefix, underlayNetworkName);
 158                     updateTransportZone(zoneName, dpnId, localIp, tx);
 159                 }
 160             } else {
 161                 updateTransportZone(zoneNamePrefix, dpnId, getDpnLocalIp(dpnId), tx);
 162             }
 163         }), LOG, "Error updating transport zone");
 164     }
 165
 166     @SuppressWarnings("checkstyle:IllegalCatch")
 167     private void updateTransportZone(String zoneName, BigInteger dpnId, @Nullable String localIp,
 168             @Nonnull TypedReadWriteTransaction<Configuration> tx)
 169             throws ExecutionException, InterruptedException {
 170         InstanceIdentifier<TransportZone> inst = InstanceIdentifier.create(TransportZones.class)
 171                 .child(TransportZone.class, new TransportZoneKey(zoneName));
 172
 173         // FIXME: Read this through a cache
 174         TransportZone zone = tx.read(inst).get().orNull();
 175
 176         if (zone == null) {
 177             zone = createZone(ALL_SUBNETS, zoneName);
 178         }
 179
 180         try {
 181             if (addVtep(zone, ALL_SUBNETS, dpnId, localIp)) {
 182                 updateTransportZone(zone, dpnId, tx);
 183             }
 184         } catch (Exception e) {
 185             LOG.error("Failed to add tunnels for dpn {} in zone {}", dpnId, zoneName, e);
 186         }
 187     }
 188
 189     private void deleteTransportZone(TransportZone zone, BigInteger dpnId,
 190             @Nonnull TypedWriteTransaction<Configuration> tx) {
 191         InstanceIdentifier<TransportZone> path = InstanceIdentifier.builder(TransportZones.class)
 192                 .child(TransportZone.class, new TransportZoneKey(zone.getZoneName())).build();
 193         tx.delete(path);
 194         LOG.info("Transport zone {} deleted due to dpn {} handling.", zone.getZoneName(), dpnId);
 195     }
 196
 197     public void deleteTransportZone(String zoneNamePrefix, BigInteger dpnId) {
 198         ListenableFutures.addErrorLogging(txRunner.callWithNewReadWriteTransactionAndSubmit(CONFIGURATION, tx -> {
 199             Map<String, String> localIps = getDpnLocalIps(dpnId);
 200             if (!localIps.isEmpty()) {
 201                 LOG.debug("Will use local_ips for transport zone delete for dpn {} and zone name prefix {}", dpnId,
 202                         zoneNamePrefix);
 203                 for (String underlayNetworkName : localIps.values()) {
 204                     String zoneName = getTzNameForUnderlayNetwork(zoneNamePrefix, underlayNetworkName);
 205                     deleteTransportZone(zoneName, dpnId, tx);
 206                 }
 207             } else {
 208                 deleteTransportZone(zoneNamePrefix, dpnId, tx);
 209             }
 210         }), LOG, "Error deleting transport zone");
 211     }
 212
 213     @SuppressWarnings("checkstyle:IllegalCatch")
 214     private void deleteTransportZone(String zoneName, BigInteger dpnId,
 215             @Nonnull TypedReadWriteTransaction<Configuration> tx) throws ExecutionException, InterruptedException {
 216         InstanceIdentifier<TransportZone> inst = InstanceIdentifier.create(TransportZones.class)
 217                 .child(TransportZone.class, new TransportZoneKey(zoneName));
 218
 219         // FIXME: Read this through a cache
 220         TransportZone zone = tx.read(inst).get().orNull();
 221         if (zone != null) {
 222             try {
 223                 deleteTransportZone(zone, dpnId, tx);
 224             } catch (Exception e) {
 225                 LOG.error("Failed to remove tunnels for dpn {} in zone {}", dpnId, zoneName, e);
 226             }
 227         }
 228     }
 229
 230
 231     /**
 232      * Update transport zones based on local_ips TEP ips mapping to underlay
 233      * networks.<br>
 234      * Deleted local_ips will be removed from the VTEP list of the corresponding
 235      * transport zones.<br>
 236      * Added local_ips will be added to all transport zones currently associated
 237      * with the TEP<br>
 238      * local_ips for whom the underlay network mapping has been changed will be
 239      * updated in the VTEP lists of the corresponding transport zones.
 240      *
 241      * @param origNode
 242      *            original OVS node
 243      * @param updatedNode
 244      *            updated OVS node
 245      * @param managerNodeId
 246      *            uuid of the OVS manager node
 247      */
 248     public void handleOvsdbNodeUpdate(Node origNode, Node updatedNode, String managerNodeId) {
 249         Map<String,
 250                 String> origLocalIpMap = java.util.Optional
 251                         .ofNullable(elanBridgeManager.getOpenvswitchOtherConfigMap(origNode, LOCAL_IPS))
 252                         .orElse(Collections.emptyMap());
 253         Map<String,
 254                 String> updatedLocalIpMap = java.util.Optional
 255                         .ofNullable(elanBridgeManager.getOpenvswitchOtherConfigMap(updatedNode, LOCAL_IPS))
 256                         .orElse(Collections.emptyMap());
 257         MapDifference<String, String> mapDiff = Maps.difference(origLocalIpMap, updatedLocalIpMap);
 258         if (mapDiff.areEqual()) {
 259             return;
 260         }
 261
 262         java.util.Optional<BigInteger> dpIdOpt = elanBridgeManager.getDpIdFromManagerNodeId(managerNodeId);
 263         if (!dpIdOpt.isPresent()) {
 264             LOG.debug("No DPN id found for node {}", managerNodeId);
 265             return;
 266         }
 267
 268         ListenableFutures.addErrorLogging(txRunner.callWithNewReadWriteTransactionAndSubmit(CONFIGURATION, tx -> {
 269             BigInteger dpId = dpIdOpt.get();
 270             Optional<DPNTEPsInfo> dpnTepsInfoOpt = getDpnTepsInfo(dpId, tx);
 271             if (!dpnTepsInfoOpt.isPresent()) {
 272                 LOG.debug("No DPNTEPsInfo found for DPN id {}", dpId);
 273                 return;
 274             }
 275
 276             List<TunnelEndPoints> tunnelEndPoints = dpnTepsInfoOpt.get().getTunnelEndPoints();
 277             if (tunnelEndPoints == null || tunnelEndPoints.isEmpty()) {
 278                 LOG.debug("No tunnel endpoints defined for DPN id {}", dpId);
 279                 return;
 280             }
 281
 282             Set<String> zonePrefixes = new HashSet<>();
 283             Map<String, List<String>> tepTzMap = tunnelEndPoints.stream().collect(Collectors
 284                     .toMap(tep -> tep.getIpAddress().stringValue(), this::getTepTransportZoneNames));
 285             LOG.trace("Transport zone prefixes {}", tepTzMap);
 286
 287             handleRemovedLocalIps(mapDiff.entriesOnlyOnLeft(), dpId, zonePrefixes, tepTzMap, tx);
 288             handleChangedLocalIps(mapDiff.entriesDiffering(), dpId, zonePrefixes, tepTzMap, tx);
 289             handleAddedLocalIps(mapDiff.entriesOnlyOnRight(), dpId, zonePrefixes, tx);
 290         }), LOG, "Error handling OVSDB node update");
 291     }
 292
 293     private void handleAddedLocalIps(Map<String, String> addedEntries, BigInteger dpId, Set<String> zonePrefixes,
 294             TypedReadWriteTransaction<Configuration> tx) throws ExecutionException, InterruptedException {
 295         if (addedEntries == null || addedEntries.isEmpty()) {
 296             LOG.trace("No added local_ips found for DPN {}", dpId);
 297             return;
 298         }
 299
 300         LOG.debug("Added local_ips {} on DPN {}", addedEntries.keySet(), dpId);
 301         for (Map.Entry<String, String> addedEntry : addedEntries.entrySet()) {
 302             String ipAddress = addedEntry.getKey();
 303             String underlayNetworkName = addedEntry.getValue();
 304             for (String zonePrefix : zonePrefixes) {
 305                 String zoneName = getTzNameForUnderlayNetwork(zonePrefix, underlayNetworkName);
 306                 updateTransportZone(zoneName, dpId, ipAddress, tx);
 307             }
 308         }
 309     }
 310
 311     private void handleChangedLocalIps(Map<String, ValueDifference<String>> changedEntries, BigInteger dpId,
 312             Set<String> zonePrefixes, Map<String, List<String>> tepTzMap,
 313             @Nonnull TypedReadWriteTransaction<Configuration> tx) throws ExecutionException, InterruptedException {
 314         if (changedEntries == null || changedEntries.isEmpty()) {
 315             LOG.trace("No changed local_ips found for DPN {}", dpId);
 316             return;
 317         }
 318
 319         LOG.debug("Changing underlay network mapping for local_ips {} on DPN {}", changedEntries.keySet(), dpId);
 320         for (Map.Entry<String, ValueDifference<String>> changedEntry : changedEntries.entrySet()) {
 321             String ipAddress = changedEntry.getKey();
 322             ValueDifference<String> underlayNetworkDiff = changedEntry.getValue();
 323             List<String> zoneNames = tepTzMap.get(ipAddress);
 324             if (zoneNames != null) {
 325                 for (String zoneName : zoneNames) {
 326                     String removedUnderlayNetwork = underlayNetworkDiff.leftValue();
 327                     String addedUnderlayNetwork = underlayNetworkDiff.rightValue();
 328                     Optional<String> zonePrefixOpt = getZonePrefixForUnderlayNetwork(zoneName, removedUnderlayNetwork);
 329                     if (zonePrefixOpt.isPresent()) {
 330                         String zonePrefix = zonePrefixOpt.get();
 331                         removeVtep(zoneName, dpId, tx);
 332                         zonePrefixes.add(zonePrefix);
 333                         String newZoneName = getTzNameForUnderlayNetwork(zonePrefix, addedUnderlayNetwork);
 334                         updateTransportZone(newZoneName, dpId, ipAddress, tx);
 335                     }
 336                 }
 337             }
 338         }
 339     }
 340
 341     private void handleRemovedLocalIps(Map<String, String> removedEntries, BigInteger dpId, Set<String> zonePrefixes,
 342             Map<String, List<String>> tepTzMap, @Nonnull TypedWriteTransaction<Configuration> tx) {
 343         if (removedEntries == null || removedEntries.isEmpty()) {
 344             LOG.trace("No removed local_ips found on DPN {}", dpId);
 345             return;
 346         }
 347
 348         LOG.debug("Removed local_ips {} for DPN {}", removedEntries.keySet(), dpId);
 349         removedEntries.forEach((ipAddress, underlayNetworkName) -> {
 350             List<String> zoneNames = tepTzMap.get(ipAddress);
 351             if (zoneNames != null) {
 352                 for (String zoneName : zoneNames) {
 353                     Optional<String> zonePrefix = getZonePrefixForUnderlayNetwork(zoneName, underlayNetworkName);
 354                     if (zonePrefix.isPresent()) {
 355                         removeVtep(zoneName, dpId, tx);
 356                         zonePrefixes.add(zonePrefix.get());
 357                     }
 358                 }
 359             }
 360         });
 361     }
 362
 363     private List<String> getTepTransportZoneNames(TunnelEndPoints tep) {
 364         List<TzMembership> tzMembershipList = tep.getTzMembership();
 365         if (tzMembershipList == null) {
 366             LOG.debug("No TZ membership exist for TEP ip {}", tep.getIpAddress().stringValue());
 367             return Collections.emptyList();
 368         }
 369
 370         return tzMembershipList.stream().map(TzMembership::getZoneName).distinct()
 371                 .collect(Collectors.toList());
 372     }
 373
 374     private Optional<DPNTEPsInfo> getDpnTepsInfo(BigInteger dpId, TypedReadTransaction<Configuration> tx) {
 375         InstanceIdentifier<DPNTEPsInfo> identifier = InstanceIdentifier.builder(DpnEndpoints.class)
 376                 .child(DPNTEPsInfo.class, new DPNTEPsInfoKey(dpId)).build();
 377         try {
 378             return tx.read(identifier).get();
 379         } catch (InterruptedException | ExecutionException e) {
 380             LOG.warn("Failed to read DPNTEPsInfo for DPN id {}", dpId);
 381             return Optional.absent();
 382         }
 383     }
 384
 385     /**
 386      * Tries to add a vtep for a transport zone.
 387      *
 388      * @return Whether a vtep was added or not.
 389      */
 390     private boolean addVtep(TransportZone zone, String subnetIp, BigInteger dpnId, @Nullable String localIp) {
 391         List<Subnets> zoneSubnets = zone.getSubnets();
 392         if (zoneSubnets == null) {
 393             return false;
 394         }
 395
 396         Subnets subnets = getOrAddSubnet(zoneSubnets, subnetIp);
 397         for (Vteps existingVtep : subnets.getVteps()) {
 398             if (existingVtep.getDpnId().equals(dpnId)) {
 399                 return false;
 400             }
 401         }
 402
 403         if (localIp != null) {
 404             IpAddress nodeIp = IpAddressBuilder.getDefaultInstance(localIp);
 405             VtepsBuilder vtepsBuilder = new VtepsBuilder().setDpnId(dpnId).setIpAddress(nodeIp)
 406                     .setPortname(TUNNEL_PORT).setOptionOfTunnel(elanConfig.isUseOfTunnels());
 407             subnets.getVteps().add(vtepsBuilder.build());
 408             return true;
 409         }
 410
 411         return false;
 412     }
 413
 414     private void removeVtep(String zoneName, BigInteger dpId, @Nonnull TypedWriteTransaction<Configuration> tx) {
 415         InstanceIdentifier<Vteps> path = InstanceIdentifier.builder(TransportZones.class)
 416                 .child(TransportZone.class, new TransportZoneKey(zoneName))
 417                 .child(Subnets.class, new SubnetsKey(IpPrefixBuilder.getDefaultInstance(ALL_SUBNETS)))
 418                 .child(Vteps.class, new VtepsKey(dpId, TUNNEL_PORT)).build();
 419         tx.delete(path);
 420     }
 421
 422     // search for relevant subnets for the given subnetIP, add one if it is
 423     // necessary
 424     private Subnets getOrAddSubnet(@Nonnull List<Subnets> subnets, @Nonnull String subnetIp) {
 425         IpPrefix subnetPrefix = IpPrefixBuilder.getDefaultInstance(subnetIp);
 426
 427         for (Subnets subnet : subnets) {
 428             if (subnet.getPrefix().equals(subnetPrefix)) {
 429                 return subnet;
 430             }
 431         }
 432
 433         Subnets retSubnet = buildSubnets(subnetIp);
 434         subnets.add(retSubnet);
 435
 436         return retSubnet;
 437     }
 438
 439     private Subnets buildSubnets(String subnetIp) {
 440         SubnetsBuilder subnetsBuilder = new SubnetsBuilder().setDeviceVteps(new ArrayList<>())
 441                 .setGatewayIp(IpAddressBuilder.getDefaultInstance(ALL_SUBNETS_GW))
 442                 .withKey(new SubnetsKey(IpPrefixBuilder.getDefaultInstance(subnetIp))).setVlanId(0)
 443                 .setVteps(new ArrayList<>());
 444         return subnetsBuilder.build();
 445     }
 446
 447     private String getDpnLocalIp(BigInteger dpId) throws ReadFailedException {
 448         Optional<Node> node = getPortsNode(dpId);
 449
 450         if (node.isPresent()) {
 451             String localIp = southBoundUtils.getOpenvswitchOtherConfig(node.get(), LOCAL_IP);
 452             if (localIp == null) {
 453                 LOG.error("missing local_ip key in ovsdb:openvswitch-other-configs in operational"
 454                         + " network-topology for node: {}", node.get().getNodeId().getValue());
 455             } else {
 456                 return localIp;
 457             }
 458         }
 459
 460         return null;
 461     }
 462
 463     @Nonnull
 464     private Map<String, String> getDpnLocalIps(BigInteger dpId) throws ReadFailedException {
 465         // Example of local IPs from other_config:
 466         // local_ips="10.0.43.159:MPLS,11.11.11.11:DSL,ip:underlay-network"
 467         return getPortsNode(dpId).toJavaUtil().map(
 468             node -> elanBridgeManager.getOpenvswitchOtherConfigMap(node, LOCAL_IPS)).orElse(Collections.emptyMap());
 469     }
 470
 471     @SuppressWarnings("unchecked")
 472     private Optional<Node> getPortsNode(BigInteger dpnId) throws ReadFailedException {
 473         InstanceIdentifier<BridgeRefEntry> bridgeRefInfoPath = InstanceIdentifier.create(BridgeRefInfo.class)
 474                 .child(BridgeRefEntry.class, new BridgeRefEntryKey(dpnId));
 475
 476         // FIXME: Read this through a cache
 477         Optional<BridgeRefEntry> optionalBridgeRefEntry =
 478             singleTxBroker.syncReadOptional(LogicalDatastoreType.OPERATIONAL, bridgeRefInfoPath);
 479         if (!optionalBridgeRefEntry.isPresent()) {
 480             LOG.error("no bridge ref entry found for dpnId {}", dpnId);
 481             return Optional.absent();
 482         }
 483
 484         InstanceIdentifier<Node> nodeId =
 485                 optionalBridgeRefEntry.get().getBridgeReference().getValue().firstIdentifierOf(Node.class);
 486
 487         // FIXME: Read this through a cache
 488         Optional<Node> optionalNode = singleTxBroker.syncReadOptional(LogicalDatastoreType.OPERATIONAL, nodeId);
 489         if (!optionalNode.isPresent()) {
 490             LOG.error("missing node for dpnId {}", dpnId);
 491         }
 492         return optionalNode;
 493     }
 494
 495     private String getTzNameForUnderlayNetwork(String zoneNamePrefix, String underlayNetworkName) {
 496         return zoneNamePrefix + IP_NETWORK_ZONE_NAME_DELIMITER + underlayNetworkName;
 497     }
 498
 499     private Optional<String> getZonePrefixForUnderlayNetwork(String zoneName, String underlayNetworkName) {
 500         String[] zoneParts = zoneName.split(IP_NETWORK_ZONE_NAME_DELIMITER + underlayNetworkName);
 501         return zoneParts.length == 2 ? Optional.of(zoneParts[0]) : Optional.absent();
 502     }
 503 }