vpnmanager/impl/src/main/java/org/opendaylight/netvirt/vpnmanager/SubnetRoutePacketInHandler.java

   1 /*
   2  * Copyright (c) 2016, 2018 Ericsson India Global Services Pvt Ltd. 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.vpnmanager;
   9
  10 import com.google.common.base.Optional;
  11 import com.google.common.primitives.Ints;
  12 import java.math.BigInteger;
  13 import java.net.InetAddress;
  14 import java.net.UnknownHostException;
  15 import java.util.List;
  16 import java.util.concurrent.ExecutionException;
  17 import javax.inject.Inject;
  18 import javax.inject.Singleton;
  19 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  20 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  21 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  22 import org.opendaylight.genius.datastoreutils.SingleTransactionDataBroker;
  23 import org.opendaylight.genius.interfacemanager.interfaces.IInterfaceManager;
  24 import org.opendaylight.genius.mdsalutil.MetaDataUtil;
  25 import org.opendaylight.genius.mdsalutil.NWUtil;
  26 import org.opendaylight.genius.mdsalutil.NwConstants;
  27 import org.opendaylight.genius.mdsalutil.packet.Ethernet;
  28 import org.opendaylight.genius.mdsalutil.packet.IPv4;
  29 import org.opendaylight.infrautils.utils.concurrent.JdkFutures;
  30 import org.opendaylight.netvirt.vpnmanager.api.ICentralizedSwitchProvider;
  31 import org.opendaylight.netvirt.vpnmanager.api.VpnHelper;
  32 import org.opendaylight.netvirt.vpnmanager.utilities.VpnManagerCounters;
  33 import org.opendaylight.openflowplugin.libraries.liblldp.BitBufferHelper;
  34 import org.opendaylight.openflowplugin.libraries.liblldp.BufferException;
  35 import org.opendaylight.openflowplugin.libraries.liblldp.HexEncode;
  36 import org.opendaylight.openflowplugin.libraries.liblldp.NetUtils;
  37 import org.opendaylight.openflowplugin.libraries.liblldp.Packet;
  38 import org.opendaylight.openflowplugin.libraries.liblldp.PacketException;
  39 import org.opendaylight.yang.gen.v1.urn.huawei.params.xml.ns.yang.l3vpn.rev140815.vpn.interfaces.VpnInterface;
  40 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress;
  41 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpPrefix;
  42 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6Address;
  43 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.MacAddress;
  44 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.Uuid;
  45 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.rev160406.IfTunnel;
  46 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.rpcs.rev160406.OdlInterfaceRpcService;
  47 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.ipv6.nd.util.rev170210.Ipv6NdUtilService;
  48 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.elan.rev150602.elan.tag.name.map.ElanTagName;
  49 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.l3vpn.rev130911.subnet.op.data.SubnetOpDataEntry;
  50 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.l3vpn.rev130911.vpn.id.to.vpn.instance.VpnIds;
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.natservice.rev160111.ext.routers.Routers;
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.natservice.rev160111.ext.routers.routers.ExternalIps;
  53 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.neutronvpn.rev150602.networkmaps.NetworkMap;
  54 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.neutronvpn.rev150602.subnetmaps.Subnetmap;
  55 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.service.rev130709.PacketProcessingListener;
  56 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.service.rev130709.PacketProcessingService;
  57 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.service.rev130709.PacketReceived;
  58 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.service.rev130709.TransmitPacketInput;
  59 import org.slf4j.Logger;
  60 import org.slf4j.LoggerFactory;
  61
  62 @Singleton
  63 public class SubnetRoutePacketInHandler implements PacketProcessingListener {
  64     private static final Logger LOG = LoggerFactory.getLogger(SubnetRoutePacketInHandler.class);
  65     private static final String LOGGING_PREFIX = "SUBNETROUTE:";
  66     private final DataBroker dataBroker;
  67     private final PacketProcessingService packetService;
  68     private final OdlInterfaceRpcService odlInterfaceRpcService;
  69     private final ICentralizedSwitchProvider centralizedSwitchProvider;
  70     private final IInterfaceManager interfaceManager;
  71     private final VpnManagerCounters vpnManagerCounters;
  72     private final Ipv6NdUtilService ipv6NdUtilService;
  73     private final VpnUtil vpnUtil;
  74
  75     @Inject
  76     public SubnetRoutePacketInHandler(final DataBroker dataBroker, final PacketProcessingService packetService,
  77             final OdlInterfaceRpcService odlInterfaceRpcService,
  78             final ICentralizedSwitchProvider centralizedSwitchProvider, final IInterfaceManager interfaceManager,
  79             VpnManagerCounters vpnManagerCounters, final Ipv6NdUtilService ipv6NdUtilService, VpnUtil vpnUtil) {
  80         this.dataBroker = dataBroker;
  81         this.packetService = packetService;
  82         this.odlInterfaceRpcService = odlInterfaceRpcService;
  83         this.centralizedSwitchProvider = centralizedSwitchProvider;
  84         this.interfaceManager = interfaceManager;
  85         this.vpnManagerCounters = vpnManagerCounters;
  86         this.ipv6NdUtilService = ipv6NdUtilService;
  87         this.vpnUtil = vpnUtil;
  88     }
  89
  90     @Override
  91     public void onPacketReceived(PacketReceived notification) {
  92
  93         short tableId = notification.getTableId().getValue();
  94         LOG.trace("{} onPacketReceived: Packet punted from table {}", LOGGING_PREFIX, tableId);
  95         byte[] data = notification.getPayload();
  96         if (notification.getMatch() == null || notification.getMatch().getMetadata() == null) {
  97             LOG.error("{} onPacketReceived: Received from table {} where the match or metadata are null",
  98                     LOGGING_PREFIX, tableId);
  99             return;
 100         }
 101         BigInteger metadata = notification.getMatch().getMetadata().getMetadata();
 102         Ethernet res = new Ethernet();
 103
 104         if (tableId == NwConstants.L3_SUBNET_ROUTE_TABLE) {
 105             LOG.trace("{} onPacketReceived: Some packet received as {}", LOGGING_PREFIX, notification);
 106             try {
 107                 res.deserialize(data, 0, data.length * NetUtils.NUM_BITS_IN_A_BYTE);
 108             } catch (PacketException e) {
 109                 LOG.error("{} onPacketReceived: Failed to decode Packet ", LOGGING_PREFIX, e);
 110                 vpnManagerCounters.subnetRoutePacketFailed();
 111                 return;
 112             }
 113             byte[] srcIpBytes = null;
 114             byte[] dstIpBytes = null;
 115             String srcIpStr;
 116             String dstIpStr;
 117             String srcMac = NWUtil.toStringMacAddress(res.getSourceMACAddress());
 118             try {
 119                 Packet pkt = res.getPayload();
 120                 if (pkt instanceof IPv4) {
 121                     IPv4 ipv4 = (IPv4) pkt;
 122                     srcIpBytes = Ints.toByteArray(ipv4.getSourceAddress());
 123                     dstIpBytes = Ints.toByteArray(ipv4.getDestinationAddress());
 124                     // It is an ARP request on a configured VPN. So we must
 125                     // attempt to respond.
 126                 } else {
 127                     // IPv6 case
 128                     // TODO: IPv6 deserializer
 129                     int ethType = BitBufferHelper.getInt(
 130                             BitBufferHelper.getBits(data, VpnConstants.ETHTYPE_START, VpnConstants.TWO_BYTES));
 131                     if (ethType == VpnConstants.IP_V6_ETHTYPE) {
 132                         srcIpBytes = BitBufferHelper.getBits(data, VpnConstants.IP_V6_HDR_START + 64, 128);
 133                         dstIpBytes = BitBufferHelper.getBits(data, VpnConstants.IP_V6_HDR_START + 192, 128);
 134                     }
 135                 }
 136                 if (srcIpBytes == null || dstIpBytes == null) {
 137                     LOG.trace("{} onPacketReceived: Non-IP packet received as {}", LOGGING_PREFIX, notification);
 138                     return;
 139                 }
 140                 srcIpStr = NWUtil.toStringIpAddress(srcIpBytes);
 141                 dstIpStr = NWUtil.toStringIpAddress(dstIpBytes);
 142
 143                 handleIpPackets(srcIpBytes, dstIpBytes, srcIpStr, dstIpStr, srcMac, metadata);
 144
 145             } catch (UnknownHostException | InterruptedException | ExecutionException | BufferException ex) {
 146                 // Failed to handle packet
 147                 vpnManagerCounters.subnetRoutePacketFailed();
 148                 LOG.error("{} onPacketReceived: Failed to handle subnetroute packet.", LOGGING_PREFIX, ex);
 149             } catch (ReadFailedException e) {
 150                 vpnManagerCounters.subnetRoutePacketFailed();
 151                 LOG.error("{} onPacketReceived: Failed to read data-store.", LOGGING_PREFIX, e);
 152             }
 153             return;
 154         }
 155         // All Arp responses learning for invisble IPs is handled by
 156         // ArpNotificationHandler
 157
 158     }
 159
 160     private void handleIpPackets(byte[] srcIp, byte[] dstIp, String srcIpStr, String dstIpStr, String srcMac,
 161             BigInteger metadata)
 162             throws UnknownHostException, InterruptedException, ExecutionException, ReadFailedException {
 163         long vpnId = MetaDataUtil.getVpnIdFromMetadata(metadata);
 164
 165         LOG.info("{} onPacketReceived: Processing IP Packet received with Source IP {} and Target IP {}"
 166                 + " and vpnId {}", LOGGING_PREFIX, srcIpStr, dstIpStr, vpnId);
 167
 168         Optional<VpnIds> vpnIdsOptional = SingleTransactionDataBroker.syncReadOptional(dataBroker,
 169                 LogicalDatastoreType.CONFIGURATION, VpnUtil.getVpnIdToVpnInstanceIdentifier(vpnId));
 170
 171         if (!vpnIdsOptional.isPresent()) {
 172             // Donot trigger subnetroute logic for packets from
 173             // unknown VPNs
 174             vpnManagerCounters.subnetRoutePacketIgnored();
 175             LOG.info("{} onPacketReceived: Ignoring IPv4 packet with destination Ip {} and source Ip {}"
 176                     + " as it came on unknown VPN with ID {}", LOGGING_PREFIX, dstIpStr, srcIpStr, vpnId);
 177             return;
 178         }
 179
 180         String vpnIdVpnInstanceName = vpnIdsOptional.get().getVpnInstanceName();
 181         if (vpnUtil.getNeutronPortFromVpnPortFixedIp(vpnIdVpnInstanceName, dstIpStr) != null) {
 182             vpnManagerCounters.subnetRoutePacketIgnored();
 183             LOG.info("{} onPacketReceived: IP Packet received with Target IP {} source IP {} vpnId {} "
 184                     + "is a valid Neutron port,ignoring subnet route processing", LOGGING_PREFIX, dstIpStr,
 185                     srcIp, vpnId);
 186             return;
 187         }
 188
 189         if (vpnUtil.getLearntVpnVipToPort(vpnIdVpnInstanceName, dstIpStr) != null) {
 190             vpnManagerCounters.subnetRoutePacketIgnored();
 191             LOG.info("{} onPacketReceived: IP Packet received with Target IP {} source Ip {} vpnId {}"
 192                     + " is an already discovered IPAddress, ignoring subnet route processing",
 193                     LOGGING_PREFIX, dstIpStr, srcIp, vpnId);
 194             return;
 195         }
 196
 197         long elanTag = MetaDataUtil.getElanTagFromMetadata(metadata);
 198         if (elanTag == 0L) {
 199             vpnManagerCounters.subnetRoutePacketFailed();
 200             LOG.error("{} onPacketReceived: elanTag value from metadata found to be 0, for IP "
 201                     + " Packet received with Target IP {} src Ip {} vpnId {}",
 202                     LOGGING_PREFIX, dstIpStr, srcIp, vpnId);
 203             return;
 204         }
 205
 206         if (!vpnIdsOptional.get().isExternalVpn()) {
 207             handleInternalVpnSubnetRoutePacket(metadata, dstIp, srcIpStr, dstIpStr, vpnIdVpnInstanceName,
 208                     elanTag);
 209             return;
 210         }
 211
 212         handleBgpVpnSubnetRoute(srcMac, dstIp, dstIpStr, srcIpStr, elanTag);
 213     }
 214
 215     private void handleBgpVpnSubnetRoute(String srcMac, byte[] dstIp, String dstIpStr, String srcIpStr,
 216             long elanTag) throws UnknownHostException {
 217         LOG.info("{} handleBgpVpnSubnetRoute: Processing IP Packet received with Source IP {} and Target IP {}"
 218                 + " and elan Tag {}", LOGGING_PREFIX, srcIpStr, dstIpStr, elanTag);
 219         SubnetOpDataEntry targetSubnetForPacketOut =
 220                 getTargetSubnetForPacketOut(elanTag, dstIpStr);
 221         if (targetSubnetForPacketOut != null) {
 222             // Handle subnet routes ip requests
 223             transmitArpOrNsPacket(targetSubnetForPacketOut.getNhDpnId(), srcIpStr, srcMac, dstIp, dstIpStr, elanTag);
 224         } else {
 225             vpnManagerCounters.subnetRoutePacketFailed();
 226             LOG.debug("{} handleBgpVpnSubnetRoute: Could not find target subnet for packet out {}", LOGGING_PREFIX,
 227                     dstIpStr);
 228         }
 229     }
 230
 231     private void handleInternalVpnSubnetRoutePacket(BigInteger metadata, byte[] dstIp, String srcIpStr, String dstIpStr,
 232             String vpnIdVpnInstanceName, long elanTag)
 233             throws InterruptedException, ExecutionException, UnknownHostException {
 234         String vmVpnInterfaceName = vpnUtil.getVpnInterfaceName(metadata);
 235         if (isTunnel(vmVpnInterfaceName)) {
 236             handlePacketFromTunnelToExternalNetwork(vpnIdVpnInstanceName, srcIpStr, dstIp, dstIpStr, elanTag);
 237         }
 238         VpnInterface vmVpnInterface = vpnUtil.getVpnInterface(vmVpnInterfaceName);
 239         if (vmVpnInterface == null) {
 240             LOG.error("Vpn interface {} doesn't exist.", vmVpnInterfaceName);
 241             vpnManagerCounters.subnetRoutePacketFailed();
 242             return;
 243         }
 244         if (VpnHelper.doesVpnInterfaceBelongToVpnInstance(vpnIdVpnInstanceName,
 245                vmVpnInterface.getVpnInstanceNames())
 246                && !vpnUtil.isBgpVpnInternet(vpnIdVpnInstanceName)) {
 247             LOG.trace("Unknown IP is in internal network");
 248             handlePacketToInternalNetwork(dstIp, dstIpStr, elanTag);
 249         } else {
 250             LOG.trace("Unknown IP is in external network");
 251             String vpnName = vpnUtil.getInternetVpnFromVpnInstanceList(vmVpnInterface.getVpnInstanceNames());
 252             if (vpnName != null) {
 253                 handlePacketToExternalNetwork(new Uuid(vpnIdVpnInstanceName), vpnName, dstIp, dstIpStr, elanTag);
 254             } else {
 255                 vpnName = VpnHelper.getFirstVpnNameFromVpnInterface(vmVpnInterface);
 256                 LOG.trace("Unknown IP is in external network, but internet VPN not found." + " fallback to first VPN");
 257                 handlePacketToExternalNetwork(new Uuid(vpnIdVpnInstanceName), vpnName, dstIp, dstIpStr, elanTag);
 258
 259             }
 260         }
 261     }
 262
 263     private void transmitArpOrNsPacket(BigInteger dpnId, String sourceIpAddress, String sourceMac, byte[] dstIpBytes,
 264             String dstIpAddress, long elanTag) throws UnknownHostException {
 265         long groupid = VpnUtil.getRemoteBCGroup(elanTag);
 266         if (NWUtil.isIpv4Address(dstIpAddress)) {
 267             LOG.debug("Sending ARP: srcIp={}, srcMac={}, dstIp={}, dpId={}, elan-tag={}", sourceIpAddress, sourceMac,
 268                     dstIpAddress, dpnId, elanTag);
 269             vpnManagerCounters.subnetRoutePacketArpSent();
 270
 271             TransmitPacketInput packetInput =
 272                     ArpUtils.createArpRequestInput(dpnId, groupid, HexEncode.bytesFromHexString(sourceMac),
 273                             InetAddress.getByName(sourceIpAddress).getAddress(), dstIpBytes);
 274             JdkFutures.addErrorLogging(packetService.transmitPacket(packetInput), LOG, "Transmit packet");
 275         } else {
 276             // IPv6 case
 277             LOG.debug("Sending NS: srcIp={}, srcMac={}, dstIp={}, dpId={}, elan-tag={}", sourceIpAddress, sourceMac,
 278                     dstIpAddress, dpnId, elanTag);
 279             vpnManagerCounters.subnetRoutePacketNsSent();
 280
 281             VpnUtil.sendNeighborSolicationToOfGroup(this.ipv6NdUtilService, new Ipv6Address(sourceIpAddress),
 282                     new MacAddress(sourceMac), new Ipv6Address(dstIpAddress), groupid, dpnId);
 283         }
 284     }
 285
 286     private void handlePacketToInternalNetwork(byte[] dstIp, String dstIpStr, long elanTag)
 287             throws UnknownHostException {
 288         try {
 289             SubnetOpDataEntry targetSubnetForPacketOut =
 290                     getTargetSubnetForPacketOut(elanTag, dstIpStr);
 291
 292             if (targetSubnetForPacketOut == null) {
 293                 LOG.debug("Couldn't find matching subnet for elan tag {} and destination ip {}", elanTag, dstIpStr);
 294                 vpnManagerCounters.subnetRoutePacketFailed();
 295                 return;
 296             }
 297
 298             Optional<Subnetmap> subnetMap = SingleTransactionDataBroker.syncReadOptional(dataBroker,
 299                     LogicalDatastoreType.CONFIGURATION,
 300                     VpnUtil.buildSubnetmapIdentifier(targetSubnetForPacketOut.getSubnetId()));
 301             if (!subnetMap.isPresent()) {
 302                 LOG.debug("Couldn't find subnet map for subnet {}", targetSubnetForPacketOut.getSubnetId());
 303                 vpnManagerCounters.subnetRoutePacketFailed();
 304                 return;
 305             }
 306
 307             String sourceIp = subnetMap.get().getRouterInterfaceFixedIp();
 308             if (sourceIp == null) {
 309                 LOG.debug("Subnet map {} doesn't have a router interface ip defined", subnetMap.get().getId());
 310                 vpnManagerCounters.subnetRoutePacketFailed();
 311                 return;
 312             }
 313
 314             String sourceMac = subnetMap.get().getRouterIntfMacAddress();
 315             if (sourceMac == null) {
 316                 LOG.debug("Subnet map {} doesn't have a router interface mac address defined",
 317                         subnetMap.get().getId());
 318                 vpnManagerCounters.subnetRoutePacketFailed();
 319                 return;
 320             }
 321
 322             transmitArpOrNsPacket(targetSubnetForPacketOut.getNhDpnId(), sourceIp, sourceMac, dstIp, dstIpStr, elanTag);
 323         } catch (ReadFailedException e) {
 324             LOG.error("handlePacketToInternalNetwork: Failed to read data store for destIp {} elanTag {}", dstIpStr,
 325                     elanTag);
 326         }
 327     }
 328
 329     private void handlePacketFromTunnelToExternalNetwork(String vpnIdVpnInstanceName, String srcIpStr, byte[] dstIp,
 330         String dstIpStr, long elanTag) throws UnknownHostException {
 331         String routerId = vpnUtil.getAssociatedExternalRouter(srcIpStr);
 332         if (null == routerId) {
 333             LOG.debug("This ip is not associated with any external router: {}", srcIpStr);
 334         }
 335         handlePacketToExternalNetwork(new Uuid(vpnIdVpnInstanceName), routerId, dstIp, dstIpStr, elanTag);
 336     }
 337
 338     private void handlePacketToExternalNetwork(Uuid vpnInstanceNameUuid, String routerId, byte[] dstIp, String dstIpStr,
 339             long elanTag) throws UnknownHostException {
 340         Routers externalRouter = vpnUtil.getExternalRouter(routerId);
 341         if (externalRouter == null) {
 342             vpnManagerCounters.subnetRoutePacketFailed();
 343             LOG.debug("{} handlePacketToExternalNetwork: Can't find external router with id {}", LOGGING_PREFIX,
 344                     routerId);
 345             return;
 346         }
 347
 348         List<ExternalIps> externalIps = externalRouter.getExternalIps();
 349         if (externalIps == null || externalIps.isEmpty()) {
 350             vpnManagerCounters.subnetRoutePacketFailed();
 351             LOG.debug("{} handlePacketToExternalNetwork: Router {} doesn't have any external ips.",
 352                     LOGGING_PREFIX, externalRouter.getRouterName());
 353             return;
 354         }
 355
 356         java.util.Optional<ExternalIps> externalIp = externalRouter.getExternalIps().stream()
 357                 .filter(eip -> vpnInstanceNameUuid.equals(eip.getSubnetId())).findFirst();
 358         if (!externalIp.isPresent()) {
 359             vpnManagerCounters.subnetRoutePacketFailed();
 360             LOG.debug("{} handlePacketToExternalNetwork: Router {} doesn't have an external ip for subnet id {}.",
 361                     LOGGING_PREFIX, externalRouter.getRouterName(), vpnInstanceNameUuid);
 362             return;
 363         }
 364
 365         BigInteger dpnId = centralizedSwitchProvider.getPrimarySwitchForRouter(externalRouter.getRouterName());
 366         if (BigInteger.ZERO.equals(dpnId)) {
 367             vpnManagerCounters.subnetRoutePacketFailed();
 368             LOG.debug("{} handlePacketToExternalNetwork: Could not find primary switch for router {}.",
 369                     LOGGING_PREFIX, externalRouter.getRouterName());
 370             return;
 371         }
 372
 373         transmitArpOrNsPacket(dpnId, externalIp.get().getIpAddress(), externalRouter.getExtGwMacAddress(), dstIp,
 374                 dstIpStr, elanTag);
 375     }
 376
 377     // return only the first VPN subnetopdataentry
 378     private SubnetOpDataEntry getTargetSubnetForPacketOut(long elanTag, String ipAddress) {
 379         ElanTagName elanInfo = vpnUtil.getElanInfoByElanTag(elanTag);
 380         if (elanInfo == null) {
 381             LOG.error("{} getTargetDpnForPacketOut: Unable to retrieve ElanInfo for elanTag {}", LOGGING_PREFIX,
 382                     elanTag);
 383             return null;
 384         }
 385         try {
 386             Optional<NetworkMap> optionalNetworkMap = SingleTransactionDataBroker.syncReadOptional(dataBroker,
 387                     LogicalDatastoreType.CONFIGURATION, VpnUtil.buildNetworkMapIdentifier(new Uuid(
 388                             elanInfo.getName())));
 389             if (!optionalNetworkMap.isPresent()) {
 390                 LOG.debug("{} getTargetDpnForPacketOut: No network map found for elan info {}", LOGGING_PREFIX,
 391                         elanInfo.getName());
 392                 return null;
 393             }
 394             List<Uuid> subnetList = optionalNetworkMap.get().getSubnetIdList();
 395             LOG.debug("{} getTargetDpnForPacketOut: Obtained subnetList as {} for network {}", LOGGING_PREFIX,
 396                     subnetList, elanInfo.getName());
 397             for (Uuid subnetId : subnetList) {
 398                 String vpnName = null;
 399                 Subnetmap sn = vpnUtil.getSubnetmapFromItsUuid(subnetId);
 400                 if (sn != null && sn.getVpnId() != null) {
 401                     vpnName = sn.getVpnId().getValue();
 402                 }
 403                 if (vpnName == null) {
 404                     continue;
 405                 }
 406                 Optional<SubnetOpDataEntry> optionalSubs;
 407                 optionalSubs = SingleTransactionDataBroker.syncReadOptional(dataBroker,
 408                         LogicalDatastoreType.OPERATIONAL, VpnUtil.buildSubnetOpDataEntryInstanceIdentifier(subnetId));
 409                 if (!optionalSubs.isPresent()) {
 410                     continue;
 411                 }
 412                 SubnetOpDataEntry subOpEntry = optionalSubs.get();
 413                 if (subOpEntry.getNhDpnId() != null) {
 414                     LOG.trace("{} getTargetDpnForPacketOut: Viewing Subnet {}", LOGGING_PREFIX, subnetId.getValue());
 415                     IpPrefix cidr = new IpPrefix(subOpEntry.getSubnetCidr().toCharArray());
 416                     boolean match = NWUtil.isIpAddressInRange(new IpAddress(ipAddress.toCharArray()), cidr);
 417                     LOG.trace("{} getTargetDpnForPacketOut: Viewing Subnet {} matching {}", LOGGING_PREFIX,
 418                             subnetId.getValue(), match);
 419                     if (match) {
 420                         return subOpEntry;
 421                     }
 422                 }
 423             }
 424         } catch (ReadFailedException e) {
 425             LOG.error("{} getTargetDpnForPacketOut: Failed to read data store for elan {}", LOGGING_PREFIX,
 426                     elanInfo.getName());
 427         }
 428         return null;
 429     }
 430
 431     public boolean isTunnel(String interfaceName) {
 432         org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang
 433             .ietf.interfaces.rev140508.interfaces.Interface configIface =
 434             interfaceManager.getInterfaceInfoFromConfigDataStore(interfaceName);
 435         return configIface.augmentation(IfTunnel.class) != null;
 436     }
 437 }