natservice/impl/src/main/java/org/opendaylight/netvirt/natservice/internal/VxlanGreConntrackBasedSnatService.java

   1 /*
   2  * Copyright © 2017 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.natservice.internal;
   9
  10 import java.math.BigInteger;
  11 import java.util.ArrayList;
  12 import java.util.Collections;
  13 import java.util.List;
  14
  15 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  16 import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;
  17 import org.opendaylight.genius.interfacemanager.interfaces.IInterfaceManager;
  18 import org.opendaylight.genius.mdsalutil.ActionInfo;
  19 import org.opendaylight.genius.mdsalutil.BucketInfo;
  20 import org.opendaylight.genius.mdsalutil.GroupEntity;
  21 import org.opendaylight.genius.mdsalutil.InstructionInfo;
  22 import org.opendaylight.genius.mdsalutil.MDSALUtil;
  23 import org.opendaylight.genius.mdsalutil.MatchInfo;
  24 import org.opendaylight.genius.mdsalutil.MatchInfoBase;
  25 import org.opendaylight.genius.mdsalutil.MetaDataUtil;
  26 import org.opendaylight.genius.mdsalutil.NwConstants;
  27 import org.opendaylight.genius.mdsalutil.actions.ActionGroup;
  28 import org.opendaylight.genius.mdsalutil.actions.ActionNxConntrack;
  29 import org.opendaylight.genius.mdsalutil.actions.ActionNxConntrack.NxCtAction;
  30 import org.opendaylight.genius.mdsalutil.actions.ActionNxLoadInPort;
  31 import org.opendaylight.genius.mdsalutil.actions.ActionNxResubmit;
  32 import org.opendaylight.genius.mdsalutil.actions.ActionSetFieldMeta;
  33 import org.opendaylight.genius.mdsalutil.actions.ActionSetFieldTunnelId;
  34 import org.opendaylight.genius.mdsalutil.instructions.InstructionApplyActions;
  35 import org.opendaylight.genius.mdsalutil.interfaces.IMdsalApiManager;
  36 import org.opendaylight.genius.mdsalutil.matches.MatchEthernetType;
  37 import org.opendaylight.genius.mdsalutil.matches.MatchIpv4Destination;
  38 import org.opendaylight.genius.mdsalutil.matches.MatchMetadata;
  39 import org.opendaylight.genius.mdsalutil.matches.MatchTunnelId;
  40 import org.opendaylight.genius.mdsalutil.nxmatches.NxMatchCtState;
  41 import org.opendaylight.netvirt.elanmanager.api.IElanService;
  42 import org.opendaylight.netvirt.vpnmanager.api.IVpnFootprintService;
  43 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.Uuid;
  44 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.idmanager.rev160406.IdManagerService;
  45 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.rpcs.rev160406.OdlInterfaceRpcService;
  46 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rpcs.rev160406.ItmRpcService;
  47 import org.opendaylight.yang.gen.v1.urn.opendaylight.group.types.rev131018.GroupTypes;
  48 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.natservice.rev160111.ProviderTypes;
  49 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.natservice.rev160111.ext.routers.Routers;
  50 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.natservice.rev160111.ext.routers.routers.ExternalIps;
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.types.rev160517.IpPrefixOrAddress;
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowjava.nx.action.rev140421.NxActionNatFlags;
  53 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowjava.nx.action.rev140421.NxActionNatRangePresent;
  54 import org.slf4j.Logger;
  55 import org.slf4j.LoggerFactory;
  56
  57 public class VxlanGreConntrackBasedSnatService extends ConntrackBasedSnatService {
  58
  59     private static final Logger LOG = LoggerFactory.getLogger(VxlanGreConntrackBasedSnatService.class);
  60     private final ExternalRoutersListener externalRouterListener;
  61     private final IElanService elanManager;
  62
  63     public VxlanGreConntrackBasedSnatService(DataBroker dataBroker, IMdsalApiManager mdsalManager,
  64                                              ItmRpcService itmManager, OdlInterfaceRpcService odlInterfaceRpcService,
  65                                              IdManagerService idManager, NAPTSwitchSelector naptSwitchSelector,
  66                                              ExternalRoutersListener externalRouterListener, IElanService elanManager,
  67                                              IInterfaceManager interfaceManager,
  68                                              IVpnFootprintService vpnFootprintService) {
  69         super(dataBroker, mdsalManager, itmManager, idManager, naptSwitchSelector, odlInterfaceRpcService,
  70                 interfaceManager, vpnFootprintService);
  71         this.externalRouterListener = externalRouterListener;
  72         this.elanManager = elanManager;
  73     }
  74
  75     @Override
  76     public boolean handleSnatAllSwitch(Routers routers, BigInteger primarySwitchId,  int addOrRemove) {
  77         ProviderTypes extNwProviderType = NatUtil.getProviderTypefromNetworkId(dataBroker, routers.getNetworkId());
  78         LOG.debug("VxlanGreConntrackBasedSnatService: handleSnatAllSwitch ProviderTypes {}", extNwProviderType);
  79         if (extNwProviderType == ProviderTypes.FLAT || extNwProviderType == ProviderTypes.VLAN) {
  80             return false;
  81         }
  82         return super.handleSnatAllSwitch(routers, primarySwitchId, addOrRemove);
  83     }
  84
  85     @Override
  86     public boolean handleSnat(Routers routers, BigInteger primarySwitchId, BigInteger dpnId,  int addOrRemove) {
  87         ProviderTypes extNwProviderType = NatUtil.getProviderTypefromNetworkId(dataBroker, routers.getNetworkId());
  88         LOG.debug("VxlanGreConntrackBasedSnatService: handleSnat ProviderTypes {}", extNwProviderType);
  89         if (extNwProviderType == ProviderTypes.FLAT || extNwProviderType == ProviderTypes.VLAN) {
  90             return false;
  91         }
  92         return super.handleSnat(routers, primarySwitchId, dpnId, addOrRemove);
  93     }
  94
  95     @Override
  96     protected void installSnatSpecificEntriesForNaptSwitch(Routers routers, BigInteger dpnId, int addOrRemove) {
  97         LOG.info("installSnatSpecificEntriesForNaptSwitch for router {}",
  98                 routers.getRouterName());
  99         String routerName = routers.getRouterName();
 100         Long routerId = NatUtil.getVpnId(dataBroker, routerName);
 101         int elanId = NatUtil.getElanInstanceByName(routers.getNetworkId().getValue(), dataBroker)
 102                 .getElanTag().intValue();
 103         /* Install Outbound NAT entries */
 104
 105         installSnatMissEntryForPrimrySwch(dpnId, routerId, elanId, addOrRemove);
 106         installTerminatingServiceTblEntryForVxlanGre(dpnId, routerName, routerId, elanId, addOrRemove);
 107         //Long extNetVpnId = NatUtil.getNetworkVpnIdFromRouterId(dataBroker, routerId);
 108         Uuid vpnUuid = NatUtil.getVpnIdfromNetworkId(dataBroker, routers.getNetworkId());
 109         if (vpnUuid == null) {
 110             LOG.error("installSnatSpecificEntriesForNaptSwitch: Unable to retrieve external vpn_id for "
 111                     + "external network {} with routerId {}", routers.getNetworkId(), routerId);
 112             return;
 113         }
 114         Long extNetVpnId = NatUtil.getVpnId(dataBroker, vpnUuid.getValue());
 115         /*//Long extNetVpnId = NatUtil.getAssociatedVPN(dataBroker, routers.getNetworkId(), LOG);
 116         if (extNetVpnId == NatConstants.INVALID_ID && addOrRemove == NwConstants.ADD_FLOW) {
 117             LOG.error("installSnatSpecificEntriesForNaptSwitch: Unable to retrieve external vpn_id for "
 118                     + "external network {} with routerId {}", routers.getNetworkId(), routerId);
 119             return;
 120         }*/
 121         LOG.info("installSnatSpecificEntriesForNaptSwitch: external network vpn_id {} for router {}",
 122                 extNetVpnId, routers.getRouterName());
 123         List<ExternalIps> externalIps = routers.getExternalIps();
 124         createOutboundTblTrackEntryForVxlanGre(dpnId, routerId, extNetVpnId, addOrRemove);
 125         createOutboundTblEntryForVxlanGre(dpnId, routerId, extNetVpnId, externalIps, elanId, addOrRemove);
 126         installNaptPfibFlowForVxlanGre(routers, dpnId, extNetVpnId, addOrRemove);
 127         installNaptPfibEntry(dpnId, routerId, addOrRemove);
 128
 129         //Install Inbound NAT entries
 130         installInboundEntryForVxlanGre(dpnId, routerId, extNetVpnId, externalIps, elanId, addOrRemove);
 131         if (externalIps.isEmpty()) {
 132             LOG.error("installSnatSpecificEntriesForNaptSwitch: No externalIP present for router {}",
 133                     routerName);
 134             return;
 135         }
 136         //The logic now handle only one external IP per router, others if present will be ignored.
 137         String externalIp = externalIps.get(0).getIpAddress();
 138         externalIp = NatUtil.validateAndAddNetworkMask(externalIp);
 139         WriteTransaction writeFlowInvTx = dataBroker.newWriteOnlyTransaction();
 140         if (addOrRemove == NwConstants.ADD_FLOW) {
 141             externalRouterListener.handleSnatReverseTraffic(dpnId, routers, routerId, routerName, externalIp,
 142                     writeFlowInvTx);
 143         } else {
 144             externalRouterListener.clearFibTsAndReverseTraffic(dpnId, routerId, routers.getNetworkId(),
 145                     Collections.singletonList(externalIp), null, routers.getExtGwMacAddress(), writeFlowInvTx);
 146         }
 147     }
 148
 149     protected void createOutboundTblTrackEntryForVxlanGre(BigInteger dpnId, Long routerId, Long extNetVpnId,
 150                                                int addOrRemove) {
 151         LOG.info("createOutboundTblTrackEntryForVxlanGre: Install Outbound tracking table flow on dpId {} for "
 152                 + "routerId {}", dpnId, routerId);
 153         List<MatchInfoBase> matches = new ArrayList<>();
 154         matches.add(MatchEthernetType.IPV4);
 155         matches.add(new NxMatchCtState(SNAT_CT_STATE, SNAT_CT_STATE_MASK));
 156         matches.add(new MatchMetadata(MetaDataUtil.getVpnIdMetadata(routerId), MetaDataUtil.METADATA_MASK_VRFID));
 157
 158         ArrayList<ActionInfo> listActionInfo = new ArrayList<>();
 159         if (addOrRemove == NwConstants.ADD_FLOW) {
 160             ActionSetFieldMeta actionSetFieldMeta = new ActionSetFieldMeta(MetaDataUtil
 161                     .getVpnIdMetadata(extNetVpnId));
 162             listActionInfo.add(actionSetFieldMeta);
 163         }
 164         ArrayList<InstructionInfo> instructionInfo = new ArrayList<>();
 165         listActionInfo.add(new ActionNxResubmit(NwConstants.NAPT_PFIB_TABLE));
 166         instructionInfo.add(new InstructionApplyActions(listActionInfo));
 167
 168         String flowRef = getFlowRef(dpnId, NwConstants.OUTBOUND_NAPT_TABLE, routerId);
 169         flowRef += "trkest";
 170         syncFlow(dpnId, NwConstants.OUTBOUND_NAPT_TABLE, flowRef, NatConstants.SNAT_TRK_FLOW_PRIORITY, flowRef,
 171                 NwConstants.COOKIE_SNAT_TABLE, matches, instructionInfo, addOrRemove);
 172
 173     }
 174
 175     protected void createOutboundTblEntryForVxlanGre(BigInteger dpnId, long routerId, Long extNetVpnId,
 176                                                      List<ExternalIps> externalIps, int elanId, int addOrRemove) {
 177         LOG.info("createOutboundTblEntryForVxlanGre: Install Outbound table flow on dpId {} for routerId {}", dpnId,
 178                 routerId);
 179         List<MatchInfoBase> matches = new ArrayList<>();
 180         matches.add(MatchEthernetType.IPV4);
 181         matches.add(new NxMatchCtState(TRACKED_NEW_CT_STATE, TRACKED_NEW_CT_MASK));
 182         matches.add(new MatchMetadata(MetaDataUtil.getVpnIdMetadata(routerId), MetaDataUtil.METADATA_MASK_VRFID));
 183         if (externalIps.isEmpty()) {
 184             LOG.error("createOutboundTblEntryForVxlanGre: No externalIP present for routerId {}",
 185                     routerId);
 186             return;
 187         }
 188         //The logic now handle only one external IP per router, others if present will be ignored.
 189         String externalIp = externalIps.get(0).getIpAddress();
 190         List<ActionInfo> actionsInfos = new ArrayList<>();
 191         if (addOrRemove == NwConstants.ADD_FLOW) {
 192             ActionSetFieldMeta actionSetFieldMeta = new ActionSetFieldMeta(MetaDataUtil
 193                     .getVpnIdMetadata(extNetVpnId));
 194             actionsInfos.add(actionSetFieldMeta);
 195         }
 196         List<ActionNxConntrack.NxCtAction> ctActionsListCommit = new ArrayList<>();
 197         int rangePresent = NxActionNatRangePresent.NXNATRANGEIPV4MIN.getIntValue();
 198         int flags = NxActionNatFlags.NXNATFSRC.getIntValue();
 199         ActionNxConntrack.NxCtAction nxCtActionCommit = new ActionNxConntrack.NxNat(0, flags, rangePresent,
 200                 new IpPrefixOrAddress(externalIp.toCharArray()).getIpAddress(),
 201                 null,0, 0);
 202         ctActionsListCommit.add(nxCtActionCommit);
 203         int ctCommitFlag = 1;
 204         ActionNxConntrack actionNxConntrackSubmit = new ActionNxConntrack(ctCommitFlag, 0, elanId,
 205                 NwConstants.NAPT_PFIB_TABLE, ctActionsListCommit);
 206         actionsInfos.add(actionNxConntrackSubmit);
 207         List<InstructionInfo> instructions = new ArrayList<>();
 208         instructions.add(new InstructionApplyActions(actionsInfos));
 209         String flowRef = getFlowRef(dpnId, NwConstants.OUTBOUND_NAPT_TABLE, routerId);
 210         syncFlow(dpnId, NwConstants.OUTBOUND_NAPT_TABLE, flowRef,  NatConstants.SNAT_NEW_FLOW_PRIORITY,
 211                 flowRef, NwConstants.COOKIE_SNAT_TABLE, matches, instructions, addOrRemove);
 212     }
 213
 214     protected void installNaptPfibFlowForVxlanGre(Routers routers, BigInteger dpnId, Long extNetVpnId,
 215                                                   int addOrRemove) {
 216         LOG.info("installNaptPfibFlowForVxlanGre: Install Napt preFibFlow on dpId {} with matching extNetVpnId {} "
 217                 + "for router {}", dpnId, extNetVpnId, routers.getRouterName());
 218         List<MatchInfoBase> matches = new ArrayList<>();
 219         matches.add(MatchEthernetType.IPV4);
 220         if (addOrRemove == NwConstants.ADD_FLOW) {
 221             matches.add(new MatchMetadata(MetaDataUtil.getVpnIdMetadata(extNetVpnId),
 222                     MetaDataUtil.METADATA_MASK_VRFID));
 223         }
 224         ArrayList<ActionInfo> listActionInfo = new ArrayList<>();
 225         ArrayList<InstructionInfo> instructions = new ArrayList<>();
 226         listActionInfo.add(new ActionNxLoadInPort(BigInteger.ZERO));
 227         listActionInfo.add(new ActionNxResubmit(NwConstants.L3_FIB_TABLE));
 228         instructions.add(new InstructionApplyActions(listActionInfo));
 229         String flowRef = getFlowRef(dpnId, NwConstants.NAPT_PFIB_TABLE, extNetVpnId);
 230         syncFlow(dpnId, NwConstants.NAPT_PFIB_TABLE, flowRef, NatConstants.SNAT_TRK_FLOW_PRIORITY,
 231                 flowRef, NwConstants.COOKIE_SNAT_TABLE, matches, instructions, addOrRemove);
 232     }
 233
 234     protected void installInboundEntryForVxlanGre(BigInteger dpnId, long routerId, Long extNeVpnId,
 235                                                   List<ExternalIps> externalIps, int elanId, int addOrRemove) {
 236         LOG.info("installInboundEntryForVxlanGre:  Install Inbound table entry on dpId {} for routerId {}",
 237                 dpnId, routerId);
 238         List<MatchInfoBase> matches = new ArrayList<>();
 239         matches.add(MatchEthernetType.IPV4);
 240         if (externalIps.isEmpty()) {
 241             LOG.error("installInboundEntryForVxlanGre : createInboundTblEntry no externalIP present for routerId {}",
 242                     routerId);
 243             return;
 244         }
 245         String externalIp = externalIps.get(0).getIpAddress();
 246         matches.add(new MatchIpv4Destination(externalIp,"32"));
 247         if (addOrRemove == NwConstants.ADD_FLOW) {
 248             matches.add(new MatchMetadata(MetaDataUtil.getVpnIdMetadata(extNeVpnId),
 249                     MetaDataUtil.METADATA_MASK_VRFID));
 250         }
 251         List<ActionInfo> actionsInfos = new ArrayList<>();
 252         List<ActionNxConntrack.NxCtAction> ctActionsList = new ArrayList<>();
 253         ActionNxConntrack.NxCtAction nxCtAction = new ActionNxConntrack.NxNat(0, 0, 0,null, null,0, 0);
 254         ActionSetFieldMeta actionSetFieldMeta = new ActionSetFieldMeta(MetaDataUtil
 255                 .getVpnIdMetadata(routerId));
 256         actionsInfos.add(actionSetFieldMeta);
 257         ctActionsList.add(nxCtAction);
 258         ActionNxConntrack actionNxConntrack = new ActionNxConntrack(0, 0, elanId, NwConstants
 259                 .NAPT_PFIB_TABLE,ctActionsList);
 260
 261         actionsInfos.add(actionNxConntrack);
 262         List<InstructionInfo> instructions = new ArrayList<>();
 263         instructions.add(new InstructionApplyActions(actionsInfos));
 264         String flowRef = getFlowRef(dpnId, NwConstants.INBOUND_NAPT_TABLE, routerId);
 265         syncFlow(dpnId, NwConstants.INBOUND_NAPT_TABLE, flowRef, NatConstants.DEFAULT_TS_FLOW_PRIORITY, flowRef,
 266                 NwConstants.COOKIE_SNAT_TABLE, matches, instructions, addOrRemove);
 267     }
 268
 269     protected void installTerminatingServiceTblEntryForVxlanGre(BigInteger dpnId, String routerName,
 270             Long  routerId, int elanId, int addOrRemove) {
 271         LOG.info("installTerminatingServiceTblEntryForVxlanGre : creating entry for"
 272                 + "Terminating Service Table for switch {}, routerId {}", dpnId, routerId);
 273         List<MatchInfo> matches = new ArrayList<>();
 274         matches.add(MatchEthernetType.IPV4);
 275
 276         BigInteger tunnelId = BigInteger.valueOf(routerId);
 277         if (elanManager.isOpenStackVniSemanticsEnforced()) {
 278             tunnelId = NatOverVxlanUtil.getRouterVni(idManager, routerName, routerId);
 279         }
 280         matches.add(new MatchTunnelId(tunnelId));
 281
 282         List<ActionInfo> actionsInfos = new ArrayList<>();
 283         List<NxCtAction> ctActionsList = new ArrayList<>();
 284         NxCtAction nxCtAction = new ActionNxConntrack.NxNat(0, 0, 0,null, null,0, 0);
 285         ctActionsList.add(nxCtAction);
 286         ActionNxConntrack actionNxConntrack = new ActionNxConntrack(0, 0, elanId, NwConstants
 287                 .OUTBOUND_NAPT_TABLE,ctActionsList);
 288         ActionSetFieldMeta actionSetFieldMeta = new ActionSetFieldMeta(MetaDataUtil
 289                 .getVpnIdMetadata(routerId.longValue()));
 290         actionsInfos.add(actionSetFieldMeta);
 291         actionsInfos.add(actionNxConntrack);
 292         List<InstructionInfo> instructions = new ArrayList<>();
 293         instructions.add(new InstructionApplyActions(actionsInfos));
 294         String flowRef = getFlowRef(dpnId, NwConstants.INTERNAL_TUNNEL_TABLE, routerId.longValue());
 295         syncFlow(dpnId,  NwConstants.INTERNAL_TUNNEL_TABLE, flowRef, NatConstants.DEFAULT_TS_FLOW_PRIORITY, flowRef,
 296                  NwConstants.COOKIE_SNAT_TABLE, matches, instructions, addOrRemove);
 297
 298     }
 299
 300     protected void installSnatMissEntry(BigInteger dpnId, Long routerId, String routerName, BigInteger primarySwitchId,
 301             int addOrRemove) {
 302         LOG.debug("installSnatMissEntry : Installing SNAT miss entry in switch {}", dpnId);
 303         List<ActionInfo> listActionInfoPrimary = new ArrayList<>();
 304         String ifNamePrimary = getTunnelInterfaceName(dpnId, primarySwitchId);
 305         List<BucketInfo> listBucketInfo = new ArrayList<>();
 306         if (ifNamePrimary != null) {
 307             LOG.debug("installSnatMissEntry : On Non- Napt switch , Primary Tunnel interface is {}", ifNamePrimary);
 308             listActionInfoPrimary = NatUtil.getEgressActionsForInterface(odlInterfaceRpcService, itmManager,
 309                     interfaceManager, ifNamePrimary, routerId);
 310         }
 311         BucketInfo bucketPrimary = new BucketInfo(listActionInfoPrimary);
 312         listBucketInfo.add(0, bucketPrimary);
 313         LOG.debug("installSnatMissEntry : installSnatMissEntry called for dpnId {} with primaryBucket {} ", dpnId,
 314                 listBucketInfo.get(0));
 315         // Install the select group
 316         long groupId = createGroupId(getGroupIdKey(routerName));
 317         GroupEntity groupEntity = MDSALUtil.buildGroupEntity(dpnId, groupId, routerName, GroupTypes.GroupAll,
 318                 listBucketInfo);
 319         LOG.debug("installSnatMissEntry : installing the SNAT to NAPT GroupEntity:{}", groupEntity);
 320         mdsalManager.installGroup(groupEntity);
 321         // Install miss entry pointing to group
 322         LOG.debug("installSnatMissEntry : buildSnatFlowEntity is called for dpId {}, routerName {} and groupId {}",
 323                 dpnId, routerName, groupId);
 324         List<MatchInfo> matches = new ArrayList<>();
 325         matches.add(new MatchEthernetType(0x0800L));
 326         matches.add(new MatchMetadata(MetaDataUtil.getVpnIdMetadata(routerId), MetaDataUtil.METADATA_MASK_VRFID));
 327
 328         List<ActionInfo> actionsInfo = new ArrayList<>();
 329
 330         BigInteger tunnelId = BigInteger.valueOf(routerId);
 331         if (elanManager.isOpenStackVniSemanticsEnforced()) {
 332             tunnelId = NatOverVxlanUtil.getRouterVni(idManager, routerName, routerId);
 333         }
 334
 335         actionsInfo.add(new ActionSetFieldTunnelId(tunnelId));
 336         LOG.debug("AbstractSnatService : Setting the tunnel to the list of action infos {}", actionsInfo);
 337         actionsInfo.add(new ActionGroup(groupId));
 338         List<InstructionInfo> instructions = new ArrayList<>();
 339         instructions.add(new InstructionApplyActions(actionsInfo));
 340         String flowRef = getFlowRef(dpnId, NwConstants.PSNAT_TABLE, routerId);
 341         syncFlow(dpnId, NwConstants.PSNAT_TABLE, flowRef,  NatConstants.DEFAULT_PSNAT_FLOW_PRIORITY, flowRef,
 342                 NwConstants.COOKIE_SNAT_TABLE, matches, instructions, addOrRemove);
 343     }
 344
 345 }