openstack/net-virt-providers/src/main/java/org/opendaylight/ovsdb/openstack/netvirt/providers/openflow13/services/LoadBalancerService.java

   1 /*
   2  * Copyright (C) 2014 SDN Hub, LLC.
   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  * Authors : Srini Seetharaman, Madhu Venugopal
   9  */
  10 package org.opendaylight.ovsdb.openstack.netvirt.providers.openflow13.services;
  11
  12 import java.math.BigInteger;
  13 import java.util.List;
  14 import java.util.Map;
  15
  16 import org.opendaylight.ovsdb.openstack.netvirt.NetworkHandler;
  17 import org.opendaylight.ovsdb.openstack.netvirt.api.Constants;
  18 import org.opendaylight.ovsdb.openstack.netvirt.api.LoadBalancerConfiguration;
  19 import org.opendaylight.ovsdb.openstack.netvirt.api.LoadBalancerConfiguration.LoadBalancerPoolMember;
  20 import org.opendaylight.ovsdb.openstack.netvirt.api.LoadBalancerProvider;
  21 import org.opendaylight.ovsdb.openstack.netvirt.api.Status;
  22 import org.opendaylight.ovsdb.openstack.netvirt.api.StatusCode;
  23 import org.opendaylight.ovsdb.openstack.netvirt.providers.ConfigInterface;
  24 import org.opendaylight.ovsdb.openstack.netvirt.providers.openflow13.AbstractServiceInstance;
  25 import org.opendaylight.ovsdb.openstack.netvirt.providers.openflow13.Service;
  26 import org.opendaylight.ovsdb.utils.mdsal.openflow.ActionUtils;
  27 import org.opendaylight.ovsdb.utils.mdsal.openflow.MatchUtils;
  28 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.PortNumber;
  29 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev100924.MacAddress;
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.action.types.rev131112.action.list.Action;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.action.types.rev131112.action.list.ActionBuilder;
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.action.types.rev131112.action.list.ActionKey;
  33 import org.opendaylight.yang.gen.v1.urn.opendaylight.action.types.rev131112.address.address.Ipv4Builder;
  34 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.FlowId;
  35 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.tables.table.FlowBuilder;
  36 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.tables.table.FlowKey;
  37 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.types.rev131026.flow.InstructionsBuilder;
  38 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.types.rev131026.flow.MatchBuilder;
  39 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.types.rev131026.instruction.instruction.ApplyActionsCaseBuilder;
  40 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.types.rev131026.instruction.instruction.apply.actions._case.ApplyActionsBuilder;
  41 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.types.rev131026.instruction.list.Instruction;
  42 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.types.rev131026.instruction.list.InstructionBuilder;
  43 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.types.rev131026.instruction.list.InstructionKey;
  44 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
  45 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeId;
  46 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.NodeBuilder;
  47 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.NodeKey;
  48 import org.opendaylight.yang.gen.v1.urn.opendaylight.l2.types.rev130827.VlanId;
  49 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowjava.nx.match.rev140421.NxmNxReg;
  50 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowjava.nx.match.rev140421.NxmNxReg1;
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowjava.nx.match.rev140421.NxmNxReg2;
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.nicira.action.rev140714.dst.choice.grouping.dst.choice.DstNxRegCaseBuilder;
  53 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowjava.nx.action.rev140421.OfjNxHashFields;
  54 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowjava.nx.action.rev140421.OfjNxMpAlgorithm;
  55 import org.osgi.framework.BundleContext;
  56 import org.osgi.framework.ServiceReference;
  57 import org.slf4j.Logger;
  58 import org.slf4j.LoggerFactory;
  59
  60 import com.google.common.collect.Lists;
  61
  62 public class LoadBalancerService extends AbstractServiceInstance implements LoadBalancerProvider, ConfigInterface {
  63
  64     private static final Logger LOG = LoggerFactory.getLogger(LoadBalancerProvider.class);
  65     private static final int DEFAULT_FLOW_PRIORITY = 32768;
  66     private static final Long FIRST_PASS_REGA_MATCH_VALUE = 0L;
  67     private static final Long SECOND_PASS_REGA_MATCH_VALUE = 1L;
  68
  69     private static final Class<? extends NxmNxReg> REG_FIELD_A = NxmNxReg1.class;
  70     private static final Class<? extends NxmNxReg> REG_FIELD_B = NxmNxReg2.class;
  71
  72     public LoadBalancerService() {
  73         super(Service.LOAD_BALANCER);
  74     }
  75
  76     public LoadBalancerService(Service service) {
  77         super(service);
  78     }
  79
  80     /**
  81      * When this method is called, we do the following for minimizing flow updates:
  82      * 1. Overwrite the solo multipath rule that applies to all members
  83      * 2. Append second pass rule for the header rewriting specific to this member
  84      * 3. Append reverse rules specific to this member
  85      */
  86     @Override
  87     public Status programLoadBalancerPoolMemberRules(Node node,
  88                                                      LoadBalancerConfiguration lbConfig, LoadBalancerPoolMember member,
  89                                                      org.opendaylight.ovsdb.openstack.netvirt.api.Action action) {
  90         if (lbConfig == null || member == null) {
  91             LOG.error("Null value for LB config {} or Member {}", lbConfig, member);
  92             return new Status(StatusCode.BADREQUEST);
  93         }
  94         if (!lbConfig.isValid()) {
  95             LOG.error("LB config is invalid: {}", lbConfig);
  96             return new Status(StatusCode.BADREQUEST);
  97         }
  98         LOG.debug("Performing {} rules for member {} with index {} on LB with VIP {} and total members {}",
  99                 action, member.getIP(), member.getIndex(), lbConfig.getVip(), lbConfig.getMembers().size());
 100
 101         NodeBuilder nodeBuilder = new NodeBuilder();
 102         nodeBuilder.setId(new NodeId(Constants.OPENFLOW_NODE_PREFIX + node.getNodeId().getValue()));
 103         nodeBuilder.setKey(new NodeKey(nodeBuilder.getId()));
 104
 105         //Update the multipath rule
 106         manageLoadBalancerVIPRulesFirstPass(nodeBuilder, lbConfig, true);
 107
 108         if (action.equals(org.opendaylight.ovsdb.openstack.netvirt.api.Action.ADD)) {
 109             manageLoadBalancerMemberVIPRulesSecondPass(nodeBuilder, lbConfig, member, true);
 110             manageLoadBalancerMemberReverseRules(nodeBuilder, lbConfig, member, true);
 111             return new Status(StatusCode.SUCCESS);
 112         }
 113         /* TODO: Delete single member.
 114          * For now, removing a member requires deleting the full LB instance and re-adding
 115          */
 116         return new Status(StatusCode.NOTIMPLEMENTED);
 117     }
 118
 119     /**
 120      * When this method is called, we perform the following:
 121      * 1. Write the solo multipath rule that applies to all members
 122      * 2. Append second pass rules for the header rewriting for all members
 123      * 3. Append reverse rules for all the members, specific to the protocol/port
 124      */
 125     @Override
 126     public Status programLoadBalancerRules(Node node, LoadBalancerConfiguration lbConfig,
 127                                            org.opendaylight.ovsdb.openstack.netvirt.api.Action action) {
 128         if (lbConfig == null || !lbConfig.isValid()) {
 129             LOG.error("LB config is invalid: {}", lbConfig);
 130             return new Status(StatusCode.BADREQUEST);
 131         }
 132         LOG.debug("Performing {} rules for VIP {} and {} members", action, lbConfig.getVip(), lbConfig.getMembers().size());
 133
 134         NodeBuilder nodeBuilder = new NodeBuilder();
 135         nodeBuilder.setId(new NodeId(Constants.OPENFLOW_NODE_PREFIX + node.getNodeId().getValue()));
 136         nodeBuilder.setKey(new NodeKey(nodeBuilder.getId()));
 137
 138         if (action.equals(org.opendaylight.ovsdb.openstack.netvirt.api.Action.ADD)) {
 139             manageLoadBalancerVIPRulesFirstPass(nodeBuilder, lbConfig, true);
 140             manageLoadBalancerVIPRulesSecondPass(nodeBuilder, lbConfig, true);
 141             manageLoadBalancerReverseRules(nodeBuilder, lbConfig, true);
 142             return new Status(StatusCode.SUCCESS);
 143         }
 144         else if (action.equals(org.opendaylight.ovsdb.openstack.netvirt.api.Action.DELETE)) {
 145             manageLoadBalancerVIPRulesFirstPass(nodeBuilder, lbConfig, false);
 146             manageLoadBalancerVIPRulesSecondPass(nodeBuilder, lbConfig, false);
 147             manageLoadBalancerReverseRules(nodeBuilder, lbConfig, false);
 148             return new Status(StatusCode.SUCCESS);
 149         }
 150
 151         return new Status(StatusCode.NOTIMPLEMENTED);
 152     }
 153
 154     /**
 155      * Method to insert/remove default rule for traffic destined to the VIP and no
 156      * server selection performed yet
 157      * @param nodeBuilder NodeBuilder
 158      * @param lbConfig LoadBalancerConfiguration
 159      * @param write Boolean to indicate of the flow is to be inserted or removed
 160      */
 161     private void manageLoadBalancerVIPRulesFirstPass(NodeBuilder nodeBuilder, LoadBalancerConfiguration lbConfig, boolean write) {
 162         MatchBuilder matchBuilder = new MatchBuilder();
 163         FlowBuilder flowBuilder = new FlowBuilder();
 164
 165         // Match Tunnel-ID, VIP, and Reg0==0
 166         if (lbConfig.getProviderNetworkType().equalsIgnoreCase(NetworkHandler.NETWORK_TYPE_VXLAN) ||
 167             lbConfig.getProviderNetworkType().equalsIgnoreCase(NetworkHandler.NETWORK_TYPE_GRE)) {
 168             MatchUtils.createTunnelIDMatch(matchBuilder, new BigInteger(lbConfig.getProviderSegmentationId()));
 169         } else if (lbConfig.getProviderNetworkType().equalsIgnoreCase(NetworkHandler.NETWORK_TYPE_VLAN)) {
 170             MatchUtils.createVlanIdMatch(matchBuilder, new VlanId(Integer.valueOf(lbConfig.getProviderSegmentationId())), true);
 171         } else {
 172             return; //Should not get here. TODO: Other types
 173         }
 174
 175         MatchUtils.createDstL3IPv4Match(matchBuilder, MatchUtils.iPv4PrefixFromIPv4Address(lbConfig.getVip()));
 176         MatchUtils.addNxRegMatch(matchBuilder, new MatchUtils.RegMatch(REG_FIELD_A, FIRST_PASS_REGA_MATCH_VALUE));
 177
 178         String flowId = "LOADBALANCER_FORWARD_FLOW1_" + lbConfig.getProviderSegmentationId() + "_" + lbConfig.getVip();
 179         flowBuilder.setId(new FlowId(flowId));
 180         FlowKey key = new FlowKey(new FlowId(flowId));
 181         flowBuilder.setMatch(matchBuilder.build());
 182         flowBuilder.setPriority(DEFAULT_FLOW_PRIORITY);
 183         flowBuilder.setBarrier(true);
 184         flowBuilder.setTableId(this.getTable());
 185         flowBuilder.setKey(key);
 186         flowBuilder.setFlowName(flowId);
 187         flowBuilder.setHardTimeout(0);
 188         flowBuilder.setIdleTimeout(0);
 189
 190         if (write) {
 191             // Create the OF Actions and Instructions
 192             InstructionsBuilder isb = new InstructionsBuilder();
 193
 194             // Instructions List Stores Individual Instructions
 195             List<Instruction> instructions = Lists.newArrayList();
 196
 197             List<Action> actionList = Lists.newArrayList();
 198
 199             ActionBuilder ab = new ActionBuilder();
 200             ab.setAction(ActionUtils.nxLoadRegAction(new DstNxRegCaseBuilder().setNxReg(REG_FIELD_A).build(),
 201                     BigInteger.valueOf(SECOND_PASS_REGA_MATCH_VALUE)));
 202             ab.setOrder(0);
 203             ab.setKey(new ActionKey(0));
 204             actionList.add(ab.build());
 205
 206             ab = new ActionBuilder();
 207             ab.setAction(ActionUtils.nxMultipathAction(OfjNxHashFields.NXHASHFIELDSSYMMETRICL4,
 208                     0, OfjNxMpAlgorithm.NXMPALGMODULON,
 209                     lbConfig.getMembers().size()-1, //By Nicira-Ext spec, this field is max_link minus 1
 210                     0L, new DstNxRegCaseBuilder().setNxReg(REG_FIELD_B).build(),
 211                     0, 31));
 212             ab.setOrder(1);
 213             ab.setKey(new ActionKey(1));
 214             actionList.add(ab.build());
 215
 216             ab = new ActionBuilder();
 217             ab.setAction(ActionUtils.nxResubmitAction(null, this.getTable()));
 218             ab.setOrder(2);
 219             ab.setKey(new ActionKey(2));
 220             actionList.add(ab.build());
 221
 222             // Create an Apply Action
 223             ApplyActionsBuilder aab = new ApplyActionsBuilder();
 224             aab.setAction(actionList);
 225             InstructionBuilder ib = new InstructionBuilder();
 226             ib.setInstruction(new ApplyActionsCaseBuilder().setApplyActions(aab.build()).build());
 227
 228             // Call the InstructionBuilder Methods Containing Actions
 229             ib.setOrder(0);
 230             ib.setKey(new InstructionKey(0));
 231             instructions.add(ib.build());
 232
 233             // Add InstructionBuilder to the Instruction(s)Builder List
 234             isb.setInstruction(instructions);
 235
 236             // Add InstructionsBuilder to FlowBuilder
 237             flowBuilder.setInstructions(isb.build());
 238
 239             writeFlow(flowBuilder, nodeBuilder);
 240
 241         } else {
 242             removeFlow(flowBuilder, nodeBuilder);
 243         }
 244     }
 245
 246     /*
 247      * Method to program each rule that matches on Reg0 and Reg1 to insert appropriate header rewriting
 248      * rules for all members. This function calls manageLoadBalancerMemberVIPRulesSecondPass in turn.
 249      * @param nodeBuilder Node to insert rule to
 250      * @param lbConfig Configuration for this LoadBalancer instance
 251      * @param write Boolean to indicate of the flow is to be inserted or removed
 252      */
 253     private void manageLoadBalancerVIPRulesSecondPass(NodeBuilder nodeBuilder, LoadBalancerConfiguration lbConfig, boolean write) {
 254         for(Map.Entry<String, LoadBalancerPoolMember> entry : lbConfig.getMembers().entrySet()){
 255             manageLoadBalancerMemberVIPRulesSecondPass(nodeBuilder, lbConfig, entry.getValue(), write);
 256         }
 257     }
 258
 259     private void manageLoadBalancerMemberVIPRulesSecondPass(NodeBuilder nodeBuilder, LoadBalancerConfiguration lbConfig, LoadBalancerPoolMember member, boolean write) {
 260         String vip = lbConfig.getVip();
 261
 262         MatchBuilder matchBuilder = new MatchBuilder();
 263         FlowBuilder flowBuilder = new FlowBuilder();
 264
 265         // Match Tunnel-ID, VIP, Reg0==1 and Reg1==Index of member
 266         if (lbConfig.getProviderNetworkType().equalsIgnoreCase(NetworkHandler.NETWORK_TYPE_VXLAN) ||
 267             lbConfig.getProviderNetworkType().equalsIgnoreCase(NetworkHandler.NETWORK_TYPE_GRE)) {
 268             MatchUtils.createTunnelIDMatch(matchBuilder, new BigInteger(lbConfig.getProviderSegmentationId()));
 269         } else if (lbConfig.getProviderNetworkType().equalsIgnoreCase(NetworkHandler.NETWORK_TYPE_VLAN)) {
 270             MatchUtils.createVlanIdMatch(matchBuilder, new VlanId(Integer.valueOf(lbConfig.getProviderSegmentationId())), true);
 271         } else {
 272             return; //Should not get here. TODO: Other types
 273         }
 274
 275         MatchUtils.createDstL3IPv4Match(matchBuilder, MatchUtils.iPv4PrefixFromIPv4Address(vip));
 276         MatchUtils.addNxRegMatch(matchBuilder, new MatchUtils.RegMatch(REG_FIELD_A, SECOND_PASS_REGA_MATCH_VALUE),
 277                                                new MatchUtils.RegMatch(REG_FIELD_B, (long)member.getIndex()));
 278
 279         String flowId = "LOADBALANCER_FORWARD_FLOW2_" + lbConfig.getProviderSegmentationId() + "_" +
 280                         vip + "_" + member.getIP();
 281         flowBuilder.setId(new FlowId(flowId));
 282         FlowKey key = new FlowKey(new FlowId(flowId));
 283         flowBuilder.setMatch(matchBuilder.build());
 284         flowBuilder.setPriority(DEFAULT_FLOW_PRIORITY+1);
 285         flowBuilder.setBarrier(true);
 286         flowBuilder.setTableId(this.getTable());
 287         flowBuilder.setKey(key);
 288         flowBuilder.setFlowName(flowId);
 289         flowBuilder.setHardTimeout(0);
 290         flowBuilder.setIdleTimeout(0);
 291
 292         if (write) {
 293             // Create the OF Actions and Instructions
 294             InstructionsBuilder isb = new InstructionsBuilder();
 295
 296             // Instructions List Stores Individual Instructions
 297             List<Instruction> instructions = Lists.newArrayList();
 298
 299             List<Action> actionList = Lists.newArrayList();
 300             ActionBuilder ab = new ActionBuilder();
 301             ab.setAction(ActionUtils.setDlDstAction(new MacAddress(member.getMAC())));
 302             ab.setOrder(0);
 303             ab.setKey(new ActionKey(0));
 304             actionList.add(ab.build());
 305
 306             ab = new ActionBuilder();
 307             Ipv4Builder ipb = new Ipv4Builder().setIpv4Address(MatchUtils.iPv4PrefixFromIPv4Address(member.getIP()));
 308             ab.setAction(ActionUtils.setNwDstAction(ipb.build()));
 309             ab.setOrder(1);
 310             ab.setKey(new ActionKey(1));
 311             actionList.add(ab.build());
 312
 313             // Create an Apply Action
 314             ApplyActionsBuilder aab = new ApplyActionsBuilder();
 315             aab.setAction(actionList);
 316
 317             // Call the InstructionBuilder Methods Containing Actions
 318             InstructionBuilder ib = new InstructionBuilder();
 319             ib.setInstruction(new ApplyActionsCaseBuilder().setApplyActions(aab.build()).build());
 320             ib.setOrder(0);
 321             ib.setKey(new InstructionKey(0));
 322             instructions.add(ib.build());
 323
 324             // Call the InstructionBuilder Methods Containing Actions
 325             ib = this.getMutablePipelineInstructionBuilder();
 326             ib.setOrder(1);
 327             ib.setKey(new InstructionKey(1));
 328             instructions.add(ib.build());
 329
 330             // Add InstructionBuilder to the Instruction(s)Builder List
 331             isb.setInstruction(instructions);
 332
 333             // Add InstructionsBuilder to FlowBuilder
 334             flowBuilder.setInstructions(isb.build());
 335
 336             writeFlow(flowBuilder, nodeBuilder);
 337
 338         } else {
 339             removeFlow(flowBuilder, nodeBuilder);
 340         }
 341     }
 342
 343     /**
 344      * Method to program all reverse rules that matches member {IP, Protocol, Port} for all members.
 345      * This function calls manageLoadBalancerMemberReverseRules in turn.
 346      * @param nodeBuilder Node to insert rule to
 347      * @param lbConfig Configuration for this LoadBalancer instance
 348      */
 349     private void manageLoadBalancerReverseRules(NodeBuilder nodeBuilder, LoadBalancerConfiguration lbConfig, boolean write) {
 350         for(Map.Entry<String, LoadBalancerPoolMember> entry : lbConfig.getMembers().entrySet()){
 351             manageLoadBalancerMemberReverseRules(nodeBuilder, lbConfig, entry.getValue(), write);
 352         }
 353     }
 354
 355     private void manageLoadBalancerMemberReverseRules(NodeBuilder nodeBuilder, LoadBalancerConfiguration lbConfig,
 356             LoadBalancerPoolMember member, boolean write) {
 357
 358         String vip = lbConfig.getVip();
 359         String vmac = lbConfig.getVmac();
 360
 361         MatchBuilder matchBuilder = new MatchBuilder();
 362         FlowBuilder flowBuilder = new FlowBuilder();
 363
 364         // Match Tunnel-ID, MemberIP, and Protocol/Port
 365         if (lbConfig.getProviderNetworkType().equalsIgnoreCase(NetworkHandler.NETWORK_TYPE_VXLAN) ||
 366                    lbConfig.getProviderNetworkType().equalsIgnoreCase(NetworkHandler.NETWORK_TYPE_GRE)) {
 367             MatchUtils.createTunnelIDMatch(matchBuilder, new BigInteger(lbConfig.getProviderSegmentationId()));
 368         } else if (lbConfig.getProviderNetworkType().equalsIgnoreCase(NetworkHandler.NETWORK_TYPE_VLAN)) {
 369             MatchUtils.createVlanIdMatch(matchBuilder, new VlanId(Integer.valueOf(lbConfig.getProviderSegmentationId())), true);
 370         } else {
 371             return; //Should not get here. TODO: Other types
 372         }
 373
 374         MatchUtils.createSrcL3IPv4Match(matchBuilder, MatchUtils.iPv4PrefixFromIPv4Address(member.getIP()));
 375         MatchUtils.createSetSrcTcpMatch(matchBuilder, new PortNumber(member.getPort()));
 376
 377         String flowId = "LOADBALANCER_REVERSE_FLOW_" + lbConfig.getProviderSegmentationId() +
 378                         vip + "_" + member.getIP();
 379         flowBuilder.setId(new FlowId(flowId));
 380         FlowKey key = new FlowKey(new FlowId(flowId));
 381         flowBuilder.setMatch(matchBuilder.build());
 382         flowBuilder.setPriority(DEFAULT_FLOW_PRIORITY);
 383         flowBuilder.setBarrier(true);
 384         flowBuilder.setTableId(this.getTable());
 385         flowBuilder.setKey(key);
 386         flowBuilder.setFlowName(flowId);
 387         flowBuilder.setHardTimeout(0);
 388         flowBuilder.setIdleTimeout(0);
 389
 390         if (write) {
 391             // Create the OF Actions and Instructions
 392             InstructionsBuilder isb = new InstructionsBuilder();
 393
 394             // Instructions List Stores Individual Instructions
 395             List<Instruction> instructions = Lists.newArrayList();
 396
 397             List<Action> actionList = Lists.newArrayList();
 398             ActionBuilder ab = new ActionBuilder();
 399             Ipv4Builder ipb = new Ipv4Builder().setIpv4Address(MatchUtils.iPv4PrefixFromIPv4Address(vip));
 400             ab.setAction(ActionUtils.setNwSrcAction(ipb.build()));
 401             ab.setOrder(0);
 402             ab.setKey(new ActionKey(0));
 403             actionList.add(ab.build());
 404
 405             /* If a dummy MAC is assigned to the VIP, we use that as the
 406              * source MAC for the reverse traffic.
 407              */
 408             if (vmac != null) {
 409                 ab = new ActionBuilder();
 410                 ab.setAction(ActionUtils.setDlDstAction(new MacAddress(vmac)));
 411                 ab.setOrder(1);
 412                 ab.setKey(new ActionKey(1));
 413                 actionList.add(ab.build());
 414             }
 415
 416             // Create an Apply Action
 417             ApplyActionsBuilder aab = new ApplyActionsBuilder();
 418             aab.setAction(actionList);
 419
 420             // Call the InstructionBuilder Methods Containing Actions
 421             InstructionBuilder ib = new InstructionBuilder();
 422             ib.setInstruction(new ApplyActionsCaseBuilder().setApplyActions(aab.build()).build());
 423             ib.setOrder(0);
 424             ib.setKey(new InstructionKey(0));
 425             instructions.add(ib.build());
 426
 427             // Call the InstructionBuilder Methods Containing Actions
 428             ib = this.getMutablePipelineInstructionBuilder();
 429             ib.setOrder(1);
 430             ib.setKey(new InstructionKey(1));
 431             instructions.add(ib.build());
 432
 433             // Add InstructionBuilder to the Instruction(s)Builder List
 434             isb.setInstruction(instructions);
 435
 436             // Add InstructionsBuilder to FlowBuilder
 437             flowBuilder.setInstructions(isb.build());
 438
 439             writeFlow(flowBuilder, nodeBuilder);
 440
 441         } else {
 442             removeFlow(flowBuilder, nodeBuilder);
 443         }
 444     }
 445
 446     @Override
 447     public void setDependencies(BundleContext bundleContext, ServiceReference serviceReference) {
 448         super.setDependencies(bundleContext.getServiceReference(LoadBalancerProvider.class.getName()), this);
 449     }
 450
 451     @Override
 452     public void setDependencies(Object impl) {
 453
 454     }
 455 }