Examples with OchSignalCriterion org.onosproject.net.flow.criteria.OchSignalCriterion used on opensource projects

Example 1 with OchSignalCriterion

use of org.onosproject.net.flow.criteria.OchSignalCriterion in project onos by opennetworkinglab.

the class OpticalIntentsWebResource method getIntents.

/**
 * Get the optical intents on the network.
 *
 * @return 200 OK
 */
@GET
@Produces(MediaType.APPLICATION_JSON)
public Response getIntents() {
    DeviceService deviceService = get(DeviceService.class);
    IntentService intentService = get(IntentService.class);
    Iterator intentItr = intentService.getIntents().iterator();
    ArrayNode arrayFlows = mapper().createArrayNode();
    while (intentItr.hasNext()) {
        Intent intent = (Intent) intentItr.next();
        if (intent instanceof OpticalConnectivityIntent) {
            OpticalConnectivityIntent opticalConnectivityIntent = (OpticalConnectivityIntent) intent;
            Device srcDevice = deviceService.getDevice(opticalConnectivityIntent.getSrc().deviceId());
            Device dstDevice = deviceService.getDevice(opticalConnectivityIntent.getDst().deviceId());
            String srcDeviceName = srcDevice.annotations().value(AnnotationKeys.NAME);
            String dstDeviceName = dstDevice.annotations().value(AnnotationKeys.NAME);
            ObjectNode objectNode = mapper().createObjectNode();
            objectNode.put("intent id", opticalConnectivityIntent.id().toString());
            objectNode.put("app id", opticalConnectivityIntent.appId().name());
            objectNode.put("state", intentService.getIntentState(opticalConnectivityIntent.key()).toString());
            objectNode.put("src", opticalConnectivityIntent.getSrc().toString());
            objectNode.put("dst", opticalConnectivityIntent.getDst().toString());
            objectNode.put("srcName", srcDeviceName);
            objectNode.put("dstName", dstDeviceName);
            // Only for INSTALLED intents
            if (intentService.getIntentState(intent.key()) == IntentState.INSTALLED) {
                // Retrieve associated FlowRuleIntent
                FlowRuleIntent installableIntent = (FlowRuleIntent) intentService.getInstallableIntents(opticalConnectivityIntent.key()).stream().filter(FlowRuleIntent.class::isInstance).findFirst().orElse(null);
                // TODO store utilized ochSignal in the intent resources
                if (installableIntent != null) {
                    OchSignal signal = installableIntent.flowRules().stream().filter(r -> r.selector().criteria().size() == NUM_CRITERIA_OPTICAL_CONNECTIVIY_RULE).map(r -> ((OchSignalCriterion) r.selector().getCriterion(Criterion.Type.OCH_SIGID)).lambda()).findFirst().orElse(null);
                    objectNode.put("ochSignal", signal.toString());
                    objectNode.put("centralFreq", signal.centralFrequency().asTHz() + " THz");
                }
                // Retrieve path and print it to REST
                if (installableIntent != null) {
                    String path = installableIntent.resources().stream().filter(Link.class::isInstance).map(Link.class::cast).map(r -> deviceService.getDevice(r.src().deviceId())).map(r -> r.annotations().value(AnnotationKeys.NAME)).collect(Collectors.joining(" -> "));
                    List<Link> pathLinks = installableIntent.resources().stream().filter(Link.class::isInstance).map(Link.class::cast).collect(Collectors.toList());
                    DefaultPath defaultPath = new DefaultPath(PROVIDER_ID, pathLinks, new ScalarWeight(1));
                    objectNode.put("path", defaultPath.toString());
                    objectNode.put("pathName", path + " -> " + dstDeviceName);
                }
            }
            arrayFlows.add(objectNode);
        }
    }
    ObjectNode root = this.mapper().createObjectNode().putPOJO("Intents", arrayFlows);
    return ok(root).build();
}

Example 2 with OchSignalCriterion

use of org.onosproject.net.flow.criteria.OchSignalCriterion in project onos by opennetworkinglab.

the class OplinkOpticalUtility method fromFlowRule.

/**
 * Transforms a flow FlowRule object to an OplinkCrossConnect object.
 * @param behaviour the parent driver handler
 * @param rule FlowRule object
 * @return cross connect object
 */
public static OplinkCrossConnect fromFlowRule(HandlerBehaviour behaviour, FlowRule rule) {
    // TrafficSelector
    Set<Criterion> criterions = rule.selector().criteria();
    int channel = criterions.stream().filter(c -> c instanceof OchSignalCriterion).map(c -> ((OchSignalCriterion) c).lambda().spacingMultiplier()).findAny().orElse(null);
    PortNumber inPort = criterions.stream().filter(c -> c instanceof PortCriterion).map(c -> ((PortCriterion) c).port()).findAny().orElse(null);
    // TrafficTreatment
    List<Instruction> instructions = rule.treatment().immediate();
    PortNumber outPort = instructions.stream().filter(c -> c instanceof Instructions.OutputInstruction).map(c -> ((Instructions.OutputInstruction) c).port()).findAny().orElse(null);
    int attenuation = instructions.stream().filter(c -> c instanceof Instructions.ExtensionInstructionWrapper).map(c -> ((Instructions.ExtensionInstructionWrapper) c).extensionInstruction()).filter(c -> c instanceof OplinkAttenuation).map(c -> ((OplinkAttenuation) c).getAttenuation()).findAny().orElse(DEFAULT_ATT);
    return new OplinkCrossConnect(inPort, outPort, channel, attenuation);
}

Example 3 with OchSignalCriterion

use of org.onosproject.net.flow.criteria.OchSignalCriterion in project onos by opennetworkinglab.

the class FlowModBuilder method buildMatch.

/**
 * Builds the match for the flow mod.
 *
 * @return the match
 */
// CHECKSTYLE IGNORE MethodLength FOR NEXT 300 LINES
protected Match buildMatch() {
    Match.Builder mBuilder = factory.buildMatch();
    Ip6Address ip6Address;
    Ip4Prefix ip4Prefix;
    Ip6Prefix ip6Prefix;
    EthCriterion ethCriterion;
    IPCriterion ipCriterion;
    TcpPortCriterion tcpPortCriterion;
    UdpPortCriterion udpPortCriterion;
    SctpPortCriterion sctpPortCriterion;
    IPv6NDLinkLayerAddressCriterion llAddressCriterion;
    ArpHaCriterion arpHaCriterion;
    ArpPaCriterion arpPaCriterion;
    for (Criterion c : selector.criteria()) {
        switch(c.type()) {
            case IN_PORT:
                PortCriterion inPort = (PortCriterion) c;
                mBuilder.setExact(MatchField.IN_PORT, OFPort.of((int) inPort.port().toLong()));
                break;
            case IN_PHY_PORT:
                PortCriterion inPhyPort = (PortCriterion) c;
                mBuilder.setExact(MatchField.IN_PORT, OFPort.of((int) inPhyPort.port().toLong()));
                break;
            case METADATA:
                MetadataCriterion metadata = (MetadataCriterion) c;
                mBuilder.setExact(MatchField.METADATA, OFMetadata.ofRaw(metadata.metadata()));
                break;
            case ETH_DST:
                ethCriterion = (EthCriterion) c;
                mBuilder.setExact(MatchField.ETH_DST, MacAddress.of(ethCriterion.mac().toLong()));
                break;
            case ETH_DST_MASKED:
                ethCriterion = (EthCriterion) c;
                mBuilder.setMasked(MatchField.ETH_DST, MacAddress.of(ethCriterion.mac().toLong()), MacAddress.of(ethCriterion.mask().toLong()));
                break;
            case ETH_SRC:
                ethCriterion = (EthCriterion) c;
                mBuilder.setExact(MatchField.ETH_SRC, MacAddress.of(ethCriterion.mac().toLong()));
                break;
            case ETH_SRC_MASKED:
                ethCriterion = (EthCriterion) c;
                mBuilder.setMasked(MatchField.ETH_SRC, MacAddress.of(ethCriterion.mac().toLong()), MacAddress.of(ethCriterion.mask().toLong()));
                break;
            case ETH_TYPE:
                EthTypeCriterion ethType = (EthTypeCriterion) c;
                mBuilder.setExact(MatchField.ETH_TYPE, EthType.of(ethType.ethType().toShort()));
                break;
            case VLAN_VID:
                VlanIdCriterion vid = (VlanIdCriterion) c;
                if (vid.vlanId().equals(VlanId.ANY)) {
                    mBuilder.setMasked(MatchField.VLAN_VID, OFVlanVidMatch.PRESENT, OFVlanVidMatch.PRESENT);
                } else if (vid.vlanId().equals(VlanId.NONE)) {
                    mBuilder.setExact(MatchField.VLAN_VID, OFVlanVidMatch.NONE);
                } else {
                    mBuilder.setExact(MatchField.VLAN_VID, OFVlanVidMatch.ofVlanVid(VlanVid.ofVlan(vid.vlanId().toShort())));
                }
                break;
            case VLAN_PCP:
                VlanPcpCriterion vpcp = (VlanPcpCriterion) c;
                mBuilder.setExact(MatchField.VLAN_PCP, VlanPcp.of(vpcp.priority()));
                break;
            case IP_DSCP:
                IPDscpCriterion ipDscpCriterion = (IPDscpCriterion) c;
                mBuilder.setExact(MatchField.IP_DSCP, IpDscp.of(ipDscpCriterion.ipDscp()));
                break;
            case IP_ECN:
                IPEcnCriterion ipEcnCriterion = (IPEcnCriterion) c;
                mBuilder.setExact(MatchField.IP_ECN, IpEcn.of(ipEcnCriterion.ipEcn()));
                break;
            case IP_PROTO:
                IPProtocolCriterion p = (IPProtocolCriterion) c;
                mBuilder.setExact(MatchField.IP_PROTO, IpProtocol.of(p.protocol()));
                break;
            case IPV4_SRC:
                ipCriterion = (IPCriterion) c;
                ip4Prefix = ipCriterion.ip().getIp4Prefix();
                if (ip4Prefix.prefixLength() != Ip4Prefix.MAX_MASK_LENGTH) {
                    Ip4Address maskAddr = Ip4Address.makeMaskPrefix(ip4Prefix.prefixLength());
                    Masked<IPv4Address> maskedIp = Masked.of(IPv4Address.of(ip4Prefix.address().toInt()), IPv4Address.of(maskAddr.toInt()));
                    mBuilder.setMasked(MatchField.IPV4_SRC, maskedIp);
                } else {
                    mBuilder.setExact(MatchField.IPV4_SRC, IPv4Address.of(ip4Prefix.address().toInt()));
                }
                break;
            case IPV4_DST:
                ipCriterion = (IPCriterion) c;
                ip4Prefix = ipCriterion.ip().getIp4Prefix();
                if (ip4Prefix.prefixLength() != Ip4Prefix.MAX_MASK_LENGTH) {
                    Ip4Address maskAddr = Ip4Address.makeMaskPrefix(ip4Prefix.prefixLength());
                    Masked<IPv4Address> maskedIp = Masked.of(IPv4Address.of(ip4Prefix.address().toInt()), IPv4Address.of(maskAddr.toInt()));
                    mBuilder.setMasked(MatchField.IPV4_DST, maskedIp);
                } else {
                    mBuilder.setExact(MatchField.IPV4_DST, IPv4Address.of(ip4Prefix.address().toInt()));
                }
                break;
            case TCP_SRC:
                tcpPortCriterion = (TcpPortCriterion) c;
                mBuilder.setExact(MatchField.TCP_SRC, TransportPort.of(tcpPortCriterion.tcpPort().toInt()));
                break;
            case TCP_SRC_MASKED:
                tcpPortCriterion = (TcpPortCriterion) c;
                mBuilder.setMasked(MatchField.TCP_SRC, TransportPort.of(tcpPortCriterion.tcpPort().toInt()), TransportPort.of(tcpPortCriterion.mask().toInt()));
                break;
            case TCP_DST:
                tcpPortCriterion = (TcpPortCriterion) c;
                mBuilder.setExact(MatchField.TCP_DST, TransportPort.of(tcpPortCriterion.tcpPort().toInt()));
                break;
            case TCP_DST_MASKED:
                tcpPortCriterion = (TcpPortCriterion) c;
                mBuilder.setMasked(MatchField.TCP_DST, TransportPort.of(tcpPortCriterion.tcpPort().toInt()), TransportPort.of(tcpPortCriterion.mask().toInt()));
                break;
            case UDP_SRC:
                udpPortCriterion = (UdpPortCriterion) c;
                mBuilder.setExact(MatchField.UDP_SRC, TransportPort.of(udpPortCriterion.udpPort().toInt()));
                break;
            case UDP_SRC_MASKED:
                udpPortCriterion = (UdpPortCriterion) c;
                mBuilder.setMasked(MatchField.UDP_SRC, TransportPort.of(udpPortCriterion.udpPort().toInt()), TransportPort.of(udpPortCriterion.mask().toInt()));
                break;
            case UDP_DST:
                udpPortCriterion = (UdpPortCriterion) c;
                mBuilder.setExact(MatchField.UDP_DST, TransportPort.of(udpPortCriterion.udpPort().toInt()));
                break;
            case UDP_DST_MASKED:
                udpPortCriterion = (UdpPortCriterion) c;
                mBuilder.setMasked(MatchField.UDP_DST, TransportPort.of(udpPortCriterion.udpPort().toInt()), TransportPort.of(udpPortCriterion.mask().toInt()));
                break;
            case SCTP_SRC:
                sctpPortCriterion = (SctpPortCriterion) c;
                mBuilder.setExact(MatchField.SCTP_SRC, TransportPort.of(sctpPortCriterion.sctpPort().toInt()));
                break;
            case SCTP_SRC_MASKED:
                sctpPortCriterion = (SctpPortCriterion) c;
                mBuilder.setMasked(MatchField.SCTP_SRC, TransportPort.of(sctpPortCriterion.sctpPort().toInt()), TransportPort.of(sctpPortCriterion.mask().toInt()));
                break;
            case SCTP_DST:
                sctpPortCriterion = (SctpPortCriterion) c;
                mBuilder.setExact(MatchField.SCTP_DST, TransportPort.of(sctpPortCriterion.sctpPort().toInt()));
                break;
            case SCTP_DST_MASKED:
                sctpPortCriterion = (SctpPortCriterion) c;
                mBuilder.setMasked(MatchField.SCTP_DST, TransportPort.of(sctpPortCriterion.sctpPort().toInt()), TransportPort.of(sctpPortCriterion.mask().toInt()));
                break;
            case ICMPV4_TYPE:
                IcmpTypeCriterion icmpType = (IcmpTypeCriterion) c;
                mBuilder.setExact(MatchField.ICMPV4_TYPE, ICMPv4Type.of(icmpType.icmpType()));
                break;
            case ICMPV4_CODE:
                IcmpCodeCriterion icmpCode = (IcmpCodeCriterion) c;
                mBuilder.setExact(MatchField.ICMPV4_CODE, ICMPv4Code.of(icmpCode.icmpCode()));
                break;
            case IPV6_SRC:
                ipCriterion = (IPCriterion) c;
                ip6Prefix = ipCriterion.ip().getIp6Prefix();
                if (ip6Prefix.prefixLength() != Ip6Prefix.MAX_MASK_LENGTH) {
                    Ip6Address maskAddr = Ip6Address.makeMaskPrefix(ip6Prefix.prefixLength());
                    Masked<IPv6Address> maskedIp = Masked.of(IPv6Address.of(ip6Prefix.address().toString()), IPv6Address.of(maskAddr.toString()));
                    mBuilder.setMasked(MatchField.IPV6_SRC, maskedIp);
                } else {
                    mBuilder.setExact(MatchField.IPV6_SRC, IPv6Address.of(ip6Prefix.address().toString()));
                }
                break;
            case IPV6_DST:
                ipCriterion = (IPCriterion) c;
                ip6Prefix = ipCriterion.ip().getIp6Prefix();
                if (ip6Prefix.prefixLength() != Ip6Prefix.MAX_MASK_LENGTH) {
                    Ip6Address maskAddr = Ip6Address.makeMaskPrefix(ip6Prefix.prefixLength());
                    Masked<IPv6Address> maskedIp = Masked.of(IPv6Address.of(ip6Prefix.address().toString()), IPv6Address.of(maskAddr.toString()));
                    mBuilder.setMasked(MatchField.IPV6_DST, maskedIp);
                } else {
                    mBuilder.setExact(MatchField.IPV6_DST, IPv6Address.of(ip6Prefix.address().toString()));
                }
                break;
            case IPV6_FLABEL:
                IPv6FlowLabelCriterion flowLabelCriterion = (IPv6FlowLabelCriterion) c;
                mBuilder.setExact(MatchField.IPV6_FLABEL, IPv6FlowLabel.of(flowLabelCriterion.flowLabel()));
                break;
            case ICMPV6_TYPE:
                Icmpv6TypeCriterion icmpv6Type = (Icmpv6TypeCriterion) c;
                mBuilder.setExact(MatchField.ICMPV6_TYPE, U8.of(icmpv6Type.icmpv6Type()));
                break;
            case ICMPV6_CODE:
                Icmpv6CodeCriterion icmpv6Code = (Icmpv6CodeCriterion) c;
                mBuilder.setExact(MatchField.ICMPV6_CODE, U8.of(icmpv6Code.icmpv6Code()));
                break;
            case IPV6_ND_TARGET:
                IPv6NDTargetAddressCriterion targetAddressCriterion = (IPv6NDTargetAddressCriterion) c;
                ip6Address = targetAddressCriterion.targetAddress();
                mBuilder.setExact(MatchField.IPV6_ND_TARGET, IPv6Address.of(ip6Address.toOctets()));
                break;
            case IPV6_ND_SLL:
                llAddressCriterion = (IPv6NDLinkLayerAddressCriterion) c;
                mBuilder.setExact(MatchField.IPV6_ND_SLL, MacAddress.of(llAddressCriterion.mac().toLong()));
                break;
            case IPV6_ND_TLL:
                llAddressCriterion = (IPv6NDLinkLayerAddressCriterion) c;
                mBuilder.setExact(MatchField.IPV6_ND_TLL, MacAddress.of(llAddressCriterion.mac().toLong()));
                break;
            case MPLS_LABEL:
                MplsCriterion mp = (MplsCriterion) c;
                mBuilder.setExact(MatchField.MPLS_LABEL, U32.of(mp.label().toInt()));
                break;
            case IPV6_EXTHDR:
                IPv6ExthdrFlagsCriterion exthdrFlagsCriterion = (IPv6ExthdrFlagsCriterion) c;
                mBuilder.setExact(MatchField.IPV6_EXTHDR, U16.of(exthdrFlagsCriterion.exthdrFlags()));
                break;
            case OCH_SIGID:
                try {
                    OchSignalCriterion ochSignalCriterion = (OchSignalCriterion) c;
                    OchSignal signal = ochSignalCriterion.lambda();
                    byte gridType = OpenFlowValueMapper.lookupGridType(signal.gridType());
                    byte channelSpacing = OpenFlowValueMapper.lookupChannelSpacing(signal.channelSpacing());
                    mBuilder.setExact(MatchField.EXP_OCH_SIG_ID, new CircuitSignalID(gridType, channelSpacing, (short) signal.spacingMultiplier(), (short) signal.slotGranularity()));
                } catch (NoMappingFoundException e) {
                    log.warn(e.getMessage());
                }
                break;
            case OCH_SIGTYPE:
                try {
                    OchSignalTypeCriterion sc = (OchSignalTypeCriterion) c;
                    byte signalType = OpenFlowValueMapper.lookupOchSignalType(sc.signalType());
                    mBuilder.setExact(MatchField.EXP_OCH_SIGTYPE, U8.of(signalType));
                } catch (NoMappingFoundException e) {
                    log.warn(e.getMessage());
                }
                break;
            case ODU_SIGID:
                OduSignalIdCriterion oduSignalIdCriterion = (OduSignalIdCriterion) c;
                OduSignalId oduSignalId = oduSignalIdCriterion.oduSignalId();
                mBuilder.setExact(MatchField.EXP_ODU_SIG_ID, new OduSignalID((short) oduSignalId.tributaryPortNumber(), (short) oduSignalId.tributarySlotLength(), oduSignalId.tributarySlotBitmap()));
                break;
            case ODU_SIGTYPE:
                try {
                    OduSignalTypeCriterion oduSignalTypeCriterion = (OduSignalTypeCriterion) c;
                    byte oduSigType = OpenFlowValueMapper.lookupOduSignalType(oduSignalTypeCriterion.signalType());
                    mBuilder.setExact(MatchField.EXP_ODU_SIGTYPE, U8.of(oduSigType));
                } catch (NoMappingFoundException e) {
                    log.warn(e.getMessage());
                }
                break;
            case TUNNEL_ID:
                TunnelIdCriterion tunnelId = (TunnelIdCriterion) c;
                mBuilder.setExact(MatchField.TUNNEL_ID, U64.of(tunnelId.tunnelId()));
                break;
            case MPLS_BOS:
                MplsBosCriterion mplsBos = (MplsBosCriterion) c;
                mBuilder.setExact(MatchField.MPLS_BOS, mplsBos.mplsBos() ? OFBooleanValue.TRUE : OFBooleanValue.FALSE);
                break;
            case ARP_OP:
                ArpOpCriterion arpOp = (ArpOpCriterion) c;
                mBuilder.setExact(MatchField.ARP_OP, ArpOpcode.of(arpOp.arpOp()));
                break;
            case ARP_SHA:
                arpHaCriterion = (ArpHaCriterion) c;
                mBuilder.setExact(MatchField.ARP_SHA, MacAddress.of(arpHaCriterion.mac().toLong()));
                break;
            case ARP_SPA:
                arpPaCriterion = (ArpPaCriterion) c;
                mBuilder.setExact(MatchField.ARP_SPA, IPv4Address.of(arpPaCriterion.ip().toInt()));
                break;
            case ARP_THA:
                arpHaCriterion = (ArpHaCriterion) c;
                mBuilder.setExact(MatchField.ARP_THA, MacAddress.of(arpHaCriterion.mac().toLong()));
                break;
            case ARP_TPA:
                arpPaCriterion = (ArpPaCriterion) c;
                mBuilder.setExact(MatchField.ARP_TPA, IPv4Address.of(arpPaCriterion.ip().toInt()));
                break;
            case EXTENSION:
                ExtensionCriterion extensionCriterion = (ExtensionCriterion) c;
                OFOxm oxm = buildExtensionOxm(extensionCriterion.extensionSelector());
                if (oxm == null) {
                    log.warn("Unable to build extension selector");
                    break;
                }
                if (oxm.isMasked()) {
                    mBuilder.setMasked(oxm.getMatchField(), oxm.getValue(), oxm.getMask());
                } else {
                    mBuilder.setExact(oxm.getMatchField(), oxm.getValue());
                }
                break;
            case MPLS_TC:
            case PBB_ISID:
            // TODO: need to implement PBB-ISID case when OpenFlowJ is ready
            default:
                log.warn("Match type {} not yet implemented.", c.type());
        }
    }
    return mBuilder.build();
}

Example 4 with OchSignalCriterion

use of org.onosproject.net.flow.criteria.OchSignalCriterion in project onos by opennetworkinglab.

the class ChannelData method fromFlow.

/**
 * Returns a ChannelData representation from a flow rule. The rule must contain
 * a Criterion.Type.IN_PORT selector, Criterion.Type.OCH_SIGID selector, and
 * Instruction.Type.OUTPUT instruction.
 *
 * @param rule the flow rule representing the connection
 * @return ChannelData representation of the connection
 */
public static ChannelData fromFlow(FlowRule rule) {
    checkNotNull(rule);
    Criterion in = rule.selector().getCriterion(Criterion.Type.IN_PORT);
    checkNotNull(in);
    PortNumber inPort = ((PortCriterion) in).port();
    Criterion och = rule.selector().getCriterion(Criterion.Type.OCH_SIGID);
    OchSignal ochSignal = och == null ? null : ((OchSignalCriterion) och).lambda();
    PortNumber outPort = null;
    List<Instruction> instructions = rule.treatment().allInstructions();
    for (Instruction ins : instructions) {
        if (ins.type() == Instruction.Type.OUTPUT) {
            outPort = ((Instructions.OutputInstruction) ins).port();
        }
    }
    checkNotNull(outPort);
    return new ChannelData(inPort, outPort, ochSignal);
}

Example 5 with OchSignalCriterion

use of org.onosproject.net.flow.criteria.OchSignalCriterion in project onos by opennetworkinglab.

the class RoadmCrossConnectCommand method dropRule.

/**
 * This function drops XC installed on the device, which is matching parsed criteria.
 * Takes as an input "global" parameters (passed by user through the console).
 * @return - returns number of the rules that were dropped.
 */
protected FlowId dropRule() {
    // Preparing parameters
    DeviceId device = DeviceId.deviceId(deviceId);
    PortNumber inPort = PortNumber.portNumber(srcPort);
    PortNumber outPort = PortNumber.portNumber(dstPort);
    // Creating some variables
    OchSignal ochSignal = null;
    PortNumber inputPortNumber = null;
    PortNumber outputPortNumber = null;
    // Main idea: Go over all flow rules (read out from the storage) of current device and
    // filter them based on input and output port with respect to OchSignal
    FlowRuleService fr = AbstractShellCommand.get(FlowRuleService.class);
    Iterable<FlowEntry> flowRules = fr.getFlowEntries(device);
    FlowId flowId = null;
    OchSignal referenceSignal = createOchSignal(freq, sw, gridType, channelSpacing);
    for (FlowEntry flowRule : flowRules) {
        // Taken from FlowRuleParser
        for (Criterion c : flowRule.selector().criteria()) {
            if (c instanceof OchSignalCriterion) {
                ochSignal = ((OchSignalCriterion) c).lambda();
            }
            if (c instanceof PortCriterion) {
                // obtain input port
                inputPortNumber = ((PortCriterion) c).port();
            }
        }
        for (Instruction i : flowRule.treatment().immediate()) {
            if (i instanceof L0ModificationInstruction.ModOchSignalInstruction) {
                ochSignal = ((L0ModificationInstruction.ModOchSignalInstruction) i).lambda();
            }
            if (i instanceof Instructions.OutputInstruction) {
                // obtain output port
                outputPortNumber = ((Instructions.OutputInstruction) i).port();
            }
        }
        // If we found match, then let's delete this rule
        if ((ochSignal.centralFrequency().equals(referenceSignal.centralFrequency())) & (ochSignal.slotWidth().equals(referenceSignal.slotWidth())) & (inputPortNumber.equals(inPort)) & (outputPortNumber.equals(outPort))) {
            flowId = flowRule.id();
            RoadmService manager = AbstractShellCommand.get(RoadmService.class);
            manager.removeConnection(device, flowId);
            print("Dropping existing XC from the device %s", deviceId);
            return flowId;
        }
    }
    return null;
}