Examples with TunnelId org.opendaylight.yang.gen.v1.urn.opendaylight.table.types.rev131026.TunnelId used on opensource projects

Example 1 with TunnelId

use of org.opendaylight.yang.gen.v1.urn.opendaylight.table.types.rev131026.TunnelId in project netvirt by opendaylight.

the class NaptSwitchHA method removeSnatFlowsInOldNaptSwitch.

/* This method checks the switch that gone down is a NaptSwitch for a router.
       If it is a NaptSwitch
          1) selects new NAPT switch
          2) installs nat flows in new NAPT switch
          table 21(FIB)->26(PSNAT)->group(resubmit/napttunnel)->36(Terminating)->46(outbound)->47(resubmit)->21
          3) modify the group and miss entry flow in other vSwitches pointing to newNaptSwitch
          4) Remove nat flows in oldNaptSwitch
     */
/*public void handleNaptSwitchDown(BigInteger dpnId){

        LOG.debug("handleNaptSwitchDown method is called with dpnId {}",dpnId);
        BigInteger naptSwitch;
        try {
            NaptSwitches naptSwitches = NatUtil.getNaptSwitch(dataBroker);
            if (naptSwitches == null || naptSwitches.getRouterToNaptSwitch() == null
             || naptSwitches.getRouterToNaptSwitch().isEmpty()) {
                LOG.debug("NaptSwitchDown: NaptSwitch is not allocated for none of the routers");
                return;
            }
            for (RouterToNaptSwitch routerToNaptSwitch : naptSwitches.getRouterToNaptSwitch()) {
                String routerName = routerToNaptSwitch.getRouterName();
                naptSwitch = routerToNaptSwitch.getPrimarySwitchId();
                boolean naptStatus = isNaptSwitchDown(routerName,dpnId,naptSwitch);
                if (!naptStatus) {
                    LOG.debug("NaptSwitchDown: Switch with DpnId {} is not naptSwitch for router {}",
                            dpnId, routerName);
                } else {
                    removeSnatFlowsInOldNaptSwitch(routerName,naptSwitch);
                    return;
                }
            }
        } catch (Exception ex) {
            LOG.error("Exception in handleNaptSwitchDown method {}",ex);
        }
    }*/
protected void removeSnatFlowsInOldNaptSwitch(String routerName, Long routerId, BigInteger naptSwitch, Map<String, Long> externalIpmap, WriteTransaction removeFlowInvTx) {
    // remove SNAT flows in old NAPT SWITCH
    Uuid networkId = NatUtil.getNetworkIdFromRouterName(dataBroker, routerName);
    String vpnName = getExtNetworkVpnName(routerName, networkId);
    if (vpnName == null) {
        LOG.error("removeSnatFlowsInOldNaptSwitch : Vpn is not associated to externalN/w of router {}", routerName);
        return;
    }
    ProviderTypes extNwProvType = NatEvpnUtil.getExtNwProvTypeFromRouterName(dataBroker, routerName, networkId);
    if (extNwProvType == null) {
        LOG.error("removeSnatFlowsInOldNaptSwitch : Unable to retrieve the External Network Provider Type " + "for Router {}", routerName);
        return;
    }
    if (extNwProvType == ProviderTypes.VXLAN) {
        evpnNaptSwitchHA.evpnRemoveSnatFlowsInOldNaptSwitch(routerName, routerId, vpnName, naptSwitch, removeFlowInvTx);
    } else {
        // Remove the Terminating Service table entry which forwards the packet to Outbound NAPT Table
        long tunnelId = NatUtil.getTunnelIdForNonNaptToNaptFlow(dataBroker, elanManager, idManager, routerId, routerName);
        String tsFlowRef = externalRouterListener.getFlowRefTs(naptSwitch, NwConstants.INTERNAL_TUNNEL_TABLE, tunnelId);
        FlowEntity tsNatFlowEntity = NatUtil.buildFlowEntity(naptSwitch, NwConstants.INTERNAL_TUNNEL_TABLE, tsFlowRef);
        LOG.info("removeSnatFlowsInOldNaptSwitch : Remove the flow in table {} for the old napt switch " + "with the DPN ID {} and router ID {}", NwConstants.INTERNAL_TUNNEL_TABLE, naptSwitch, routerId);
        mdsalManager.removeFlowToTx(tsNatFlowEntity, removeFlowInvTx);
    }
    if (NatUtil.isOpenStackVniSemanticsEnforcedForGreAndVxlan(elanManager, extNwProvType)) {
        // Remove the flow table 25->44 If there is no FIP Match on table 25 (PDNAT_TABLE)
        NatUtil.removePreDnatToSnatTableEntry(mdsalManager, naptSwitch, removeFlowInvTx);
    }
    // Remove the Outbound flow entry which forwards the packet to Outbound NAPT Table
    String outboundNatFlowRef = externalRouterListener.getFlowRefOutbound(naptSwitch, NwConstants.OUTBOUND_NAPT_TABLE, routerId);
    FlowEntity outboundNatFlowEntity = NatUtil.buildFlowEntity(naptSwitch, NwConstants.OUTBOUND_NAPT_TABLE, outboundNatFlowRef);
    LOG.info("Remove the flow in table {} for the old napt switch with the DPN ID {} and router ID {}", NwConstants.OUTBOUND_NAPT_TABLE, naptSwitch, routerId);
    mdsalManager.removeFlowToTx(outboundNatFlowEntity, removeFlowInvTx);
    // Remove the NAPT PFIB TABLE (47->21) which forwards the incoming packet to FIB Table matching on the
    // External Subnet Vpn Id.
    Collection<Uuid> externalSubnetIdsForRouter = NatUtil.getExternalSubnetIdsForRouter(dataBroker, routerName);
    for (Uuid externalSubnetId : externalSubnetIdsForRouter) {
        long subnetVpnId = NatUtil.getVpnId(dataBroker, externalSubnetId.getValue());
        if (subnetVpnId != -1) {
            String natPfibSubnetFlowRef = externalRouterListener.getFlowRefTs(naptSwitch, NwConstants.NAPT_PFIB_TABLE, subnetVpnId);
            FlowEntity natPfibFlowEntity = NatUtil.buildFlowEntity(naptSwitch, NwConstants.NAPT_PFIB_TABLE, natPfibSubnetFlowRef);
            mdsalManager.removeFlowToTx(natPfibFlowEntity, removeFlowInvTx);
            LOG.debug("removeSnatFlowsInOldNaptSwitch : Removed the flow in table {} with external subnet " + "Vpn Id {} as metadata on Napt Switch {}", NwConstants.NAPT_PFIB_TABLE, subnetVpnId, naptSwitch);
        }
    }
    // Remove the NAPT_PFIB_TABLE(47) flow entry forwards the packet to Fib Table for inbound traffic
    // matching on the router ID.
    String naptPFibflowRef = externalRouterListener.getFlowRefTs(naptSwitch, NwConstants.NAPT_PFIB_TABLE, routerId);
    FlowEntity naptPFibFlowEntity = NatUtil.buildFlowEntity(naptSwitch, NwConstants.NAPT_PFIB_TABLE, naptPFibflowRef);
    LOG.info("removeSnatFlowsInOldNaptSwitch : Remove the flow in table {} for the old napt switch " + "with the DPN ID {} and router ID {}", NwConstants.NAPT_PFIB_TABLE, naptSwitch, routerId);
    mdsalManager.removeFlowToTx(naptPFibFlowEntity, removeFlowInvTx);
    // Remove the NAPT_PFIB_TABLE(47) flow entry forwards the packet to Fib Table for outbound traffic
    // matching on the vpn ID.
    boolean switchSharedByRouters = false;
    Uuid extNetworkId = NatUtil.getNetworkIdFromRouterName(dataBroker, routerName);
    if (extNetworkId != null) {
        List<String> routerNamesAssociated = getRouterIdsForExtNetwork(extNetworkId);
        for (String routerNameAssociated : routerNamesAssociated) {
            if (!routerNameAssociated.equals(routerName)) {
                Long routerIdAssociated = NatUtil.getVpnId(dataBroker, routerNameAssociated);
                BigInteger naptDpn = NatUtil.getPrimaryNaptfromRouterName(dataBroker, routerNameAssociated);
                if (naptDpn != null && naptDpn.equals(naptSwitch)) {
                    LOG.debug("removeSnatFlowsInOldNaptSwitch : Napt switch {} is also acting as primary " + "for router {}", naptSwitch, routerIdAssociated);
                    switchSharedByRouters = true;
                    break;
                }
            }
        }
        if (!switchSharedByRouters) {
            Long vpnId = getVpnIdForRouter(routerId, extNetworkId);
            if (vpnId != NatConstants.INVALID_ID) {
                String naptFibflowRef = externalRouterListener.getFlowRefTs(naptSwitch, NwConstants.NAPT_PFIB_TABLE, vpnId);
                FlowEntity naptFibFlowEntity = NatUtil.buildFlowEntity(naptSwitch, NwConstants.NAPT_PFIB_TABLE, naptFibflowRef);
                LOG.info("removeSnatFlowsInOldNaptSwitch : Remove the flow in table {} for the old napt switch" + " with the DPN ID {} and vpnId {}", NwConstants.NAPT_PFIB_TABLE, naptSwitch, vpnId);
                mdsalManager.removeFlowToTx(naptFibFlowEntity, removeFlowInvTx);
            } else {
                LOG.error("removeSnatFlowsInOldNaptSwitch : Invalid vpnId retrieved for routerId {}", routerId);
                return;
            }
        }
    }
    // Remove Fib entries,tables 20->44 ,36-> 44
    String gwMacAddress = NatUtil.getExtGwMacAddFromRouterName(dataBroker, routerName);
    if (externalIpmap != null && !externalIpmap.isEmpty()) {
        for (Entry<String, Long> entry : externalIpmap.entrySet()) {
            String externalIp = entry.getKey();
            Long label = entry.getValue();
            externalRouterListener.delFibTsAndReverseTraffic(naptSwitch, routerId, externalIp, vpnName, extNetworkId, label, gwMacAddress, true, removeFlowInvTx);
            LOG.debug("removeSnatFlowsInOldNaptSwitch : Successfully removed fib entries in old naptswitch {} " + "for router {} and externalIps {} label {}", naptSwitch, routerId, externalIp, label);
        }
    } else {
        List<String> externalIps = NatUtil.getExternalIpsForRouter(dataBroker, routerName);
        if (networkId != null) {
            externalRouterListener.clearFibTsAndReverseTraffic(naptSwitch, routerId, networkId, externalIps, null, gwMacAddress, removeFlowInvTx);
            LOG.debug("removeSnatFlowsInOldNaptSwitch : Successfully removed fib entries in old naptswitch {} for " + "router {} with networkId {} and externalIps {}", naptSwitch, routerId, networkId, externalIps);
        } else {
            LOG.debug("removeSnatFlowsInOldNaptSwitch : External network not associated to router {}", routerId);
        }
        externalRouterListener.removeNaptFibExternalOutputFlows(routerId, naptSwitch, extNetworkId, externalIps, removeFlowInvTx);
    }
    // For the router ID get the internal IP , internal port and the corresponding external IP and external Port.
    IpPortMapping ipPortMapping = NatUtil.getIportMapping(dataBroker, routerId);
    if (ipPortMapping == null || ipPortMapping.getIntextIpProtocolType() == null || ipPortMapping.getIntextIpProtocolType().isEmpty()) {
        LOG.warn("removeSnatFlowsInOldNaptSwitch : No Internal Ip Port mapping associated to router {}, " + "no flows need to be removed in oldNaptSwitch {}", routerId, naptSwitch);
        return;
    }
    BigInteger cookieSnatFlow = NatUtil.getCookieNaptFlow(routerId);
    List<IntextIpProtocolType> intextIpProtocolTypes = ipPortMapping.getIntextIpProtocolType();
    for (IntextIpProtocolType intextIpProtocolType : intextIpProtocolTypes) {
        if (intextIpProtocolType.getIpPortMap() == null || intextIpProtocolType.getIpPortMap().isEmpty()) {
            LOG.debug("removeSnatFlowsInOldNaptSwitch : No {} session associated to router {}," + "no flows need to be removed in oldNaptSwitch {}", intextIpProtocolType.getProtocol(), routerId, naptSwitch);
            break;
        }
        List<IpPortMap> ipPortMaps = intextIpProtocolType.getIpPortMap();
        for (IpPortMap ipPortMap : ipPortMaps) {
            String ipPortInternal = ipPortMap.getIpPortInternal();
            String[] ipPortParts = ipPortInternal.split(":");
            if (ipPortParts.length != 2) {
                LOG.error("removeSnatFlowsInOldNaptSwitch : Unable to retrieve the Internal IP and port");
                continue;
            }
            String internalIp = ipPortParts[0];
            String internalPort = ipPortParts[1];
            // Build and remove flow in outbound NAPT table
            String switchFlowRef = NatUtil.getNaptFlowRef(naptSwitch, NwConstants.OUTBOUND_NAPT_TABLE, String.valueOf(routerId), internalIp, Integer.parseInt(internalPort));
            FlowEntity outboundNaptFlowEntity = NatUtil.buildFlowEntity(naptSwitch, NwConstants.OUTBOUND_NAPT_TABLE, cookieSnatFlow, switchFlowRef);
            LOG.info("removeSnatFlowsInOldNaptSwitch : Remove the flow in table {} for old napt switch " + "with the DPN ID {} and router ID {}", NwConstants.OUTBOUND_NAPT_TABLE, naptSwitch, routerId);
            mdsalManager.removeFlowToTx(outboundNaptFlowEntity, removeFlowInvTx);
            IpPortExternal ipPortExternal = ipPortMap.getIpPortExternal();
            if (ipPortExternal == null) {
                LOG.debug("removeSnatFlowsInOldNaptSwitch : External Ipport mapping not found for internalIp {} " + "with port {} for router {}", internalIp, internalPort, routerId);
                continue;
            }
            String externalIp = ipPortExternal.getIpAddress();
            int externalPort = ipPortExternal.getPortNum();
            // Build and remove flow in  inbound NAPT table
            switchFlowRef = NatUtil.getNaptFlowRef(naptSwitch, NwConstants.INBOUND_NAPT_TABLE, String.valueOf(routerId), externalIp, externalPort);
            FlowEntity inboundNaptFlowEntity = NatUtil.buildFlowEntity(naptSwitch, NwConstants.INBOUND_NAPT_TABLE, cookieSnatFlow, switchFlowRef);
            LOG.info("removeSnatFlowsInOldNaptSwitch : Remove the flow in table {} for old napt switch with the " + "DPN ID {} and router ID {}", NwConstants.INBOUND_NAPT_TABLE, naptSwitch, routerId);
            mdsalManager.removeFlowToTx(inboundNaptFlowEntity, removeFlowInvTx);
        }
    }
}

Example 2 with TunnelId

use of org.opendaylight.yang.gen.v1.urn.opendaylight.table.types.rev131026.TunnelId in project netvirt by opendaylight.

the class BaseVrfEntryHandler method addTunnelInterfaceActions.

protected void addTunnelInterfaceActions(AdjacencyResult adjacencyResult, long vpnId, VrfEntry vrfEntry, List<ActionInfo> actionInfos, String rd) {
    Class<? extends TunnelTypeBase> tunnelType = VpnExtraRouteHelper.getTunnelType(nextHopManager.getInterfaceManager(), adjacencyResult.getInterfaceName());
    if (tunnelType == null) {
        LOG.debug("Tunnel type not found for vrfEntry {}", vrfEntry);
        return;
    }
    // TODO - For now have added routePath into adjacencyResult so that we know for which
    // routePath this result is built for. If this is not possible construct a map which does
    // the same.
    String nextHopIp = adjacencyResult.getNextHopIp();
    java.util.Optional<Long> optionalLabel = FibUtil.getLabelForNextHop(vrfEntry, nextHopIp);
    if (!optionalLabel.isPresent()) {
        LOG.warn("NextHopIp {} not found in vrfEntry {}", nextHopIp, vrfEntry);
        return;
    }
    long label = optionalLabel.get();
    BigInteger tunnelId = null;
    Prefixes prefixInfo = null;
    // revisit
    if (tunnelType.equals(TunnelTypeVxlan.class)) {
        prefixInfo = fibUtil.getPrefixToInterface(vpnId, vrfEntry.getDestPrefix());
        // For extra route, the prefixInfo is fetched from the primary adjacency
        if (prefixInfo == null) {
            prefixInfo = fibUtil.getPrefixToInterface(vpnId, adjacencyResult.getPrefix());
        }
        // Internet VPN VNI will be used as tun_id for NAT use-cases
        if (Prefixes.PrefixCue.Nat.equals(prefixInfo.getPrefixCue())) {
            if (vrfEntry.getL3vni() != null && vrfEntry.getL3vni() != 0) {
                tunnelId = BigInteger.valueOf(vrfEntry.getL3vni());
            }
        } else {
            if (fibUtil.enforceVxlanDatapathSemanticsforInternalRouterVpn(prefixInfo.getSubnetId(), vpnId, rd)) {
                java.util.Optional<Long> optionalVni = fibUtil.getVniForVxlanNetwork(prefixInfo.getSubnetId());
                if (!optionalVni.isPresent()) {
                    LOG.error("VNI not found for nexthop {} vrfEntry {} with subnetId {}", nextHopIp, vrfEntry, prefixInfo.getSubnetId());
                    return;
                }
                tunnelId = BigInteger.valueOf(optionalVni.get());
            } else {
                tunnelId = BigInteger.valueOf(label);
            }
        }
    } else {
        tunnelId = BigInteger.valueOf(label);
    }
    LOG.debug("adding set tunnel id action for label {}", label);
    actionInfos.add(new ActionSetFieldTunnelId(tunnelId));
    addRewriteDstMacAction(vpnId, vrfEntry, prefixInfo, actionInfos);
}

Example 3 with TunnelId

use of org.opendaylight.yang.gen.v1.urn.opendaylight.table.types.rev131026.TunnelId in project netvirt by opendaylight.

the class EvpnVrfEntryHandler method createRemoteFibEntry.

private void createRemoteFibEntry(final BigInteger remoteDpnId, final long vpnId, final VrfTablesKey vrfTableKey, final VrfEntry vrfEntry, boolean isNatPrefix, WriteTransaction tx) {
    String rd = vrfTableKey.getRouteDistinguisher();
    List<SubTransaction> subTxns = new ArrayList<>();
    LOG.debug("createremotefibentry: adding route {} for rd {} with transaction {}", vrfEntry.getDestPrefix(), rd, tx);
    List<NexthopManager.AdjacencyResult> tunnelInterfaceList = resolveAdjacency(remoteDpnId, vpnId, vrfEntry, rd);
    if (tunnelInterfaceList.isEmpty()) {
        LOG.error("Could not get interface for route-paths: {} in vpn {}", vrfEntry.getRoutePaths(), rd);
        LOG.warn("Failed to add Route: {} in vpn: {}", vrfEntry.getDestPrefix(), rd);
        return;
    }
    for (NexthopManager.AdjacencyResult adjacencyResult : tunnelInterfaceList) {
        List<ActionInfo> actionInfos = new ArrayList<>();
        BigInteger tunnelId;
        String prefix = adjacencyResult.getPrefix();
        Prefixes prefixInfo = getFibUtil().getPrefixToInterface(vpnId, prefix);
        String interfaceName = prefixInfo.getVpnInterfaceName();
        if (vrfEntry.getOrigin().equals(RouteOrigin.BGP.getValue()) || isNatPrefix) {
            tunnelId = BigInteger.valueOf(vrfEntry.getL3vni());
        } else if (elanManager.isOpenStackVniSemanticsEnforced()) {
            tunnelId = BigInteger.valueOf(getFibUtil().getVniForVxlanNetwork(prefixInfo.getSubnetId()).get());
        } else {
            Interface interfaceState = getFibUtil().getInterfaceStateFromOperDS(interfaceName);
            tunnelId = BigInteger.valueOf(interfaceState.getIfIndex());
        }
        LOG.debug("adding set tunnel id action for label {}", tunnelId);
        String macAddress = null;
        String vpnName = getFibUtil().getVpnNameFromId(vpnId);
        if (vpnName == null) {
            LOG.debug("Failed to get VPN name for vpnId {}", vpnId);
            return;
        }
        if (interfaceName != null) {
            macAddress = getFibUtil().getMacAddressFromPrefix(interfaceName, vpnName, prefix);
            actionInfos.add(new ActionSetFieldEthernetDestination(new MacAddress(macAddress)));
        }
        actionInfos.add(new ActionSetFieldTunnelId(tunnelId));
        List<ActionInfo> egressActions = nexthopManager.getEgressActionsForInterface(adjacencyResult.getInterfaceName(), actionInfos.size());
        if (egressActions.isEmpty()) {
            LOG.error("Failed to retrieve egress action for prefix {} route-paths {} interface {}." + " Aborting remote FIB entry creation..", vrfEntry.getDestPrefix(), vrfEntry.getRoutePaths(), adjacencyResult.getInterfaceName());
            return;
        }
        actionInfos.addAll(egressActions);
        List<InstructionInfo> instructions = new ArrayList<>();
        instructions.add(new InstructionApplyActions(actionInfos));
        makeConnectedRoute(remoteDpnId, vpnId, vrfEntry, rd, instructions, NwConstants.ADD_FLOW, tx, subTxns);
    }
    LOG.debug("Successfully added FIB entry for prefix {} in rd {}", vrfEntry.getDestPrefix(), rd);
}

Example 4 with TunnelId

use of org.opendaylight.yang.gen.v1.urn.opendaylight.table.types.rev131026.TunnelId in project netvirt by opendaylight.

the class DhcpPktHandler method getEgressAction.

private List<Action> getEgressAction(String interfaceName, BigInteger tunnelId) {
    List<Action> actions = null;
    try {
        GetEgressActionsForInterfaceInputBuilder egressAction = new GetEgressActionsForInterfaceInputBuilder().setIntfName(interfaceName);
        if (tunnelId != null) {
            egressAction.setTunnelKey(tunnelId.longValue());
        }
        Future<RpcResult<GetEgressActionsForInterfaceOutput>> result = interfaceManagerRpc.getEgressActionsForInterface(egressAction.build());
        RpcResult<GetEgressActionsForInterfaceOutput> rpcResult = result.get();
        if (!rpcResult.isSuccessful()) {
            LOG.warn("RPC Call to Get egress actions for interface {} returned with Errors {}", interfaceName, rpcResult.getErrors());
        } else {
            actions = rpcResult.getResult().getAction();
        }
    } catch (InterruptedException | ExecutionException e) {
        LOG.warn("Exception when egress actions for interface {}", interfaceName, e);
    }
    return actions;
}

Example 5 with TunnelId

use of org.opendaylight.yang.gen.v1.urn.opendaylight.table.types.rev131026.TunnelId in project netvirt by opendaylight.

the class DhcpPktHandler method onPacketReceived.

// TODO: Handle this in a separate thread
@Override
public void onPacketReceived(PacketReceived packet) {
    if (!config.isControllerDhcpEnabled()) {
        return;
    }
    Class<? extends PacketInReason> pktInReason = packet.getPacketInReason();
    short tableId = packet.getTableId().getValue();
    if ((tableId == NwConstants.DHCP_TABLE || tableId == NwConstants.DHCP_TABLE_EXTERNAL_TUNNEL) && isPktInReasonSendtoCtrl(pktInReason)) {
        byte[] inPayload = packet.getPayload();
        Ethernet ethPkt = new Ethernet();
        try {
            ethPkt.deserialize(inPayload, 0, inPayload.length * NetUtils.NUM_BITS_IN_A_BYTE);
        } catch (PacketException e) {
            LOG.warn("Failed to decode DHCP Packet.", e);
            LOG.trace("Received packet {}", packet);
            return;
        }
        DHCP pktIn;
        pktIn = getDhcpPktIn(ethPkt);
        if (pktIn != null) {
            LOG.trace("DHCPPkt received: {}", pktIn);
            LOG.trace("Received Packet: {}", packet);
            BigInteger metadata = packet.getMatch().getMetadata().getMetadata();
            long portTag = MetaDataUtil.getLportFromMetadata(metadata).intValue();
            String macAddress = DHCPUtils.byteArrayToString(ethPkt.getSourceMACAddress());
            BigInteger tunnelId = packet.getMatch().getTunnel() == null ? null : packet.getMatch().getTunnel().getTunnelId();
            String interfaceName = getInterfaceNameFromTag(portTag);
            InterfaceInfo interfaceInfo = interfaceManager.getInterfaceInfoFromOperationalDataStore(interfaceName);
            if (interfaceInfo == null) {
                LOG.error("Failed to get interface info for interface name {}", interfaceName);
                return;
            }
            Port port;
            if (tunnelId != null) {
                port = dhcpExternalTunnelManager.readVniMacToPortCache(tunnelId, macAddress);
            } else {
                port = getNeutronPort(interfaceName);
            }
            Subnet subnet = getNeutronSubnet(port);
            String serverMacAddress = interfaceInfo.getMacAddress();
            String serverIp = null;
            if (subnet != null) {
                java.util.Optional<SubnetToDhcpPort> dhcpPortData = DhcpServiceUtils.getSubnetDhcpPortData(broker, subnet.getUuid().getValue());
                /* If enable_dhcp_service flag was enabled and an ODL network DHCP Port data was made available use
                     * the ports Fixed IP as server IP for DHCP communication.
                     */
                if (dhcpPortData.isPresent()) {
                    serverIp = dhcpPortData.get().getPortFixedip();
                    serverMacAddress = dhcpPortData.get().getPortMacaddress();
                } else {
                    // DHCP Neutron Port not found for this network
                    LOG.error("Neutron DHCP port is not available for the Subnet {} and port {}.", subnet.getUuid(), port.getUuid());
                    return;
                }
            }
            DHCP replyPkt = handleDhcpPacket(pktIn, interfaceName, macAddress, port, subnet, serverIp);
            if (replyPkt == null) {
                LOG.warn("Unable to construct reply packet for interface name {}", interfaceName);
                return;
            }
            byte[] pktOut = getDhcpPacketOut(replyPkt, ethPkt, serverMacAddress);
            sendPacketOut(pktOut, interfaceInfo.getDpId(), interfaceName, tunnelId);
        }
    }
}