ONOS-686, 687, 1344 : The first commit for the Segment Routing application

 - ICMP/ARP/IP handlers are implemented as a part of the application for now
 - Default routing and link add/failure/recovery are also supprted
 - Temporary NetworkConfigHandler, which is hardcoded to support only 6 router FISH topology, is used for test
 - Some fixes on GroupHanlder app to support transit routers
 - Supports multi-instance (tested with two instances)

Change-Id: Idfa67903e59e1c4cac4da430f89cd4c50e821420

@@ -152,11 +152,13 @@ public class DefaultGroupHandler {
      * @param newLink new neighbor link
      * @param newLink new neighbor link
      */
      */
     public void linkUp(Link newLink) {
     public void linkUp(Link newLink) {
+
         if (newLink.type() != Link.Type.DIRECT) {
         if (newLink.type() != Link.Type.DIRECT) {
             log.warn("linkUp: unknown link type");
             log.warn("linkUp: unknown link type");
             return;
             return;
         }
         }
 
 
+
         if (!newLink.src().deviceId().equals(deviceId)) {
         if (!newLink.src().deviceId().equals(deviceId)) {
             log.warn("linkUp: deviceId{} doesn't match with link src{}",
             log.warn("linkUp: deviceId{} doesn't match with link src{}",
                      deviceId,
                      deviceId,
@@ -307,13 +309,11 @@ public class DefaultGroupHandler {
 
 
         List<Integer> nsSegmentIds = new ArrayList<Integer>();
         List<Integer> nsSegmentIds = new ArrayList<Integer>();
 
 
-        // Add one entry for "no label" (-1) to the list if
-        // dpid list has not more than one node/neighbor as
-        // there will never be a case a packet going to more than one
-        // neighbor without a label at an edge router
-        if (neighbors.size() == 1) {
-            nsSegmentIds.add(-1);
-        }
+        // Always pair up with no edge label
+        //If (neighbors.size() == 1) {
+        nsSegmentIds.add(-1);
+        //}
+
         // Filter out SegmentIds matching with the
         // Filter out SegmentIds matching with the
         // nodes in the combo
         // nodes in the combo
         for (Integer sId : allSegmentIds) {
         for (Integer sId : allSegmentIds) {
@@ -405,7 +405,8 @@ public class DefaultGroupHandler {
         }
         }
     }
     }
 
 
-    protected GroupKey getGroupKey(Object obj) {
+    public GroupKey getGroupKey(Object obj) {
         return new DefaultGroupKey(kryo.build().serialize(obj));
         return new DefaultGroupKey(kryo.build().serialize(obj));
     }
     }
+
 }
 }

@@ -90,6 +90,7 @@ public class DefaultGroupHandlerApp {
     public void activate() {
     public void activate() {
         appId = coreService.registerApplication("org.onosproject.defaultgrouphandler");
         appId = coreService.registerApplication("org.onosproject.defaultgrouphandler");
         log.info("DefaultGroupHandlerApp Activating");
         log.info("DefaultGroupHandlerApp Activating");
+
         deviceService.addListener(deviceListener);
         deviceService.addListener(deviceListener);
         linkService.addListener(linkListener);
         linkService.addListener(linkListener);
         for (Device device: deviceService.getDevices()) {
         for (Device device: deviceService.getDevices()) {
@@ -111,6 +112,7 @@ public class DefaultGroupHandlerApp {
                           device.id());
                           device.id());
             }
             }
         }
         }
+
         log.info("Activated");
         log.info("Activated");
     }
     }
 
 

@@ -138,7 +138,8 @@ public class DefaultTransitGroupHandler extends DefaultGroupHandler {
                                             Set<DeviceId> updatedNeighbors) {
                                             Set<DeviceId> updatedNeighbors) {
         Set<Set<DeviceId>> powerSet = getPowerSetOfNeighbors(updatedNeighbors);
         Set<Set<DeviceId>> powerSet = getPowerSetOfNeighbors(updatedNeighbors);
 
 
-        Set<DeviceId> tmp = updatedNeighbors;
+        Set<DeviceId> tmp = new HashSet<DeviceId>();
+        tmp.addAll(updatedNeighbors);
         tmp.remove(impactedNeighbor);
         tmp.remove(impactedNeighbor);
         Set<Set<DeviceId>> tmpPowerSet = getPowerSetOfNeighbors(tmp);
         Set<Set<DeviceId>> tmpPowerSet = getPowerSetOfNeighbors(tmp);
 
 

@@ -45,6 +45,8 @@
         <module>reactive-routing</module>
         <module>reactive-routing</module>
         <module>bgprouter</module>
         <module>bgprouter</module>
         <module>test</module>
         <module>test</module>
+        <module>grouphandler</module>
+        <module>segmentrouting</module>
     </modules>
     </modules>
 
 
     <properties>
     <properties>

+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Copyright 2014 Open Networking Laboratory
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  --><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+    <artifactId>onos-apps</artifactId>
+    <groupId>org.onosproject</groupId>
+    <version>1.2.0-SNAPSHOT</version>
+  </parent>
+
+    <artifactId>onos-app-segmentrouting</artifactId>
+    <packaging>bundle</packaging>
+
+    <description>ONOS OSGi bundle archetype</description>
+    <url>http://onosproject.org</url>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onos-app-grouphandler</artifactId>
+            <version>1.2.0-SNAPSHOT</version>
+        </dependency>
+    </dependencies>
+
+</project>

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.segmentrouting;
+
+import org.onlab.packet.ARP;
+import org.onlab.packet.Ethernet;
+import org.onlab.packet.Ip4Address;
+import org.onlab.packet.IpAddress;
+import org.onlab.packet.IpPrefix;
+import org.onlab.packet.MacAddress;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.Host;
+import org.onosproject.net.Port;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.flow.DefaultTrafficTreatment;
+import org.onosproject.net.flow.TrafficTreatment;
+import org.onosproject.net.packet.DefaultOutboundPacket;
+import org.onosproject.net.packet.InboundPacket;
+import org.onosproject.net.HostId;
+import org.onosproject.net.packet.OutboundPacket;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.nio.ByteBuffer;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+public class ArpHandler {
+
+    private static Logger log = LoggerFactory.getLogger(ArpHandler.class);
+
+    private SegmentRoutingManager srManager;
+    private NetworkConfigHandler config;
+
+    /**
+     * Creates an ArpHandler object.
+     *
+     * @param srManager SegmentRoutingManager object
+     */
+    public ArpHandler(SegmentRoutingManager srManager) {
+        this.srManager = srManager;
+        this.config = checkNotNull(srManager.networkConfigHandler);
+    }
+
+    /**
+     * Processes incoming ARP packets.
+     * If it is an ARP request to router itself or known hosts,
+     * then it sends ARP response.
+     * If it is an ARP request to unknown hosts in its own subnet,
+     * then it flood the ARP request to the ports.
+     * If it is an ARP response, then set a flow rule for the host
+     * and forward any IP packets to the host in the packet buffer to the host.
+     *
+     * @param pkt incoming packet
+     */
+    public void processPacketIn(InboundPacket pkt) {
+
+        Ethernet ethernet = pkt.parsed();
+        ARP arp = (ARP) ethernet.getPayload();
+
+        ConnectPoint connectPoint = pkt.receivedFrom();
+        PortNumber inPort = connectPoint.port();
+        DeviceId deviceId = connectPoint.deviceId();
+        byte[] senderMacAddressByte = arp.getSenderHardwareAddress();
+        Ip4Address hostIpAddress = Ip4Address.valueOf(arp.getSenderProtocolAddress());
+
+        srManager.routingRulePopulator.populateIpRuleForHost(deviceId, hostIpAddress, MacAddress.
+                valueOf(senderMacAddressByte), inPort);
+
+        if (arp.getOpCode() == ARP.OP_REQUEST) {
+            handleArpRequest(deviceId, connectPoint, ethernet);
+        } else {
+            srManager.ipHandler.forwardPackets(deviceId, hostIpAddress);
+        }
+    }
+
+    private void handleArpRequest(DeviceId deviceId, ConnectPoint inPort, Ethernet payload) {
+
+        ARP arpRequest = (ARP) payload.getPayload();
+        HostId targetHostId = HostId.hostId(MacAddress.valueOf(
+                arpRequest.getTargetHardwareAddress()));
+
+        // ARP request for router
+        if (isArpReqForRouter(deviceId, arpRequest)) {
+            Ip4Address targetAddress = Ip4Address.valueOf(arpRequest.getTargetProtocolAddress());
+            sendArpResponse(arpRequest, config.getRouterMac(targetAddress));
+
+        // ARP request for known hosts
+        } else if (srManager.hostService.getHost(targetHostId) != null) {
+            MacAddress targetMac = srManager.hostService.getHost(targetHostId).mac();
+            sendArpResponse(arpRequest, targetMac);
+
+        // ARP request for unknown host in the subnet
+        } else if (isArpReqForSubnet(deviceId, arpRequest)) {
+            flood(payload, inPort);
+        }
+    }
+
+
+    private boolean isArpReqForRouter(DeviceId deviceId, ARP arpRequest) {
+        Ip4Address gatewayIpAddress = config.getGatewayIpAddress(deviceId);
+        if (gatewayIpAddress != null) {
+            Ip4Address targetProtocolAddress = Ip4Address.valueOf(arpRequest
+                    .getTargetProtocolAddress());
+            if (gatewayIpAddress.equals(targetProtocolAddress)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private boolean isArpReqForSubnet(DeviceId deviceId, ARP arpRequest) {
+        String subnetInfo = config.getSubnetInfo(deviceId);
+        if (subnetInfo != null) {
+            IpPrefix prefix = IpPrefix.valueOf(subnetInfo);
+            if (prefix.contains(Ip4Address.valueOf(arpRequest.getTargetProtocolAddress()))) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Sends an APR request for the target IP address to all ports except in-port.
+     *
+     * @param deviceId Switch device ID
+     * @param targetAddress target IP address for ARP
+     * @param inPort in-port
+     */
+    public void sendArpRequest(DeviceId deviceId, IpAddress targetAddress, ConnectPoint inPort) {
+
+        byte[] senderMacAddress = config.getRouterMacAddress(deviceId).toBytes();
+        byte[] senderIpAddress = config.getRouterIpAddress(deviceId)
+                .getIp4Prefix().address().toOctets();
+
+        ARP arpRequest = new ARP();
+        arpRequest.setHardwareType(ARP.HW_TYPE_ETHERNET)
+                  .setProtocolType(ARP.PROTO_TYPE_IP)
+                  .setHardwareAddressLength(
+                        (byte) Ethernet.DATALAYER_ADDRESS_LENGTH)
+                  .setProtocolAddressLength((byte) Ip4Address.BYTE_LENGTH)
+                  .setOpCode(ARP.OP_REQUEST)
+                  .setSenderHardwareAddress(senderMacAddress)
+                  .setTargetHardwareAddress(MacAddress.ZERO.toBytes())
+                  .setSenderProtocolAddress(senderIpAddress)
+                  .setTargetProtocolAddress(targetAddress.toOctets());
+
+        Ethernet eth = new Ethernet();
+        eth.setDestinationMACAddress(MacAddress.BROADCAST.toBytes())
+                .setSourceMACAddress(senderMacAddress)
+                .setEtherType(Ethernet.TYPE_ARP).setPayload(arpRequest);
+
+        flood(eth, inPort);
+    }
+
+    private void sendArpResponse(ARP arpRequest, MacAddress targetMac) {
+
+        ARP arpReply = new ARP();
+        arpReply.setHardwareType(ARP.HW_TYPE_ETHERNET)
+                .setProtocolType(ARP.PROTO_TYPE_IP)
+                .setHardwareAddressLength(
+                        (byte) Ethernet.DATALAYER_ADDRESS_LENGTH)
+                .setProtocolAddressLength((byte) Ip4Address.BYTE_LENGTH)
+                .setOpCode(ARP.OP_REPLY)
+                .setSenderHardwareAddress(targetMac.toBytes())
+                .setSenderProtocolAddress(arpRequest.getTargetProtocolAddress())
+                .setTargetHardwareAddress(arpRequest.getSenderHardwareAddress())
+                .setTargetProtocolAddress(arpRequest.getSenderProtocolAddress());
+
+        Ethernet eth = new Ethernet();
+        eth.setDestinationMACAddress(arpRequest.getSenderHardwareAddress())
+                .setSourceMACAddress(targetMac.toBytes())
+                .setEtherType(Ethernet.TYPE_ARP).setPayload(arpReply);
+
+
+        HostId dstId = HostId.hostId(MacAddress.valueOf(
+                arpReply.getTargetHardwareAddress()));
+        Host dst = srManager.hostService.getHost(dstId);
+        if (dst == null) {
+            log.warn("Cannot send ARP response to unknown device");
+            return;
+        }
+
+        TrafficTreatment treatment = DefaultTrafficTreatment.builder().
+                setOutput(dst.location().port()).build();
+        OutboundPacket packet = new DefaultOutboundPacket(dst.location().deviceId(),
+                treatment, ByteBuffer.wrap(eth.serialize()));
+
+        srManager.packetService.emit(packet);
+    }
+
+    private void flood(Ethernet request, ConnectPoint inPort) {
+        TrafficTreatment.Builder builder;
+        ByteBuffer buf = ByteBuffer.wrap(request.serialize());
+
+        for (Port port: srManager.deviceService.getPorts(inPort.deviceId())) {
+            if (!port.number().equals(inPort.port()) &&
+                    port.number().toLong() > 0) {
+                builder = DefaultTrafficTreatment.builder();
+                builder.setOutput(port.number());
+                srManager.packetService.emit(new DefaultOutboundPacket(inPort.deviceId(),
+                        builder.build(), buf));
+            }
+        }
+    }
+
+}

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.segmentrouting;
+
+import org.onlab.packet.IpPrefix;
+import org.onosproject.net.Device;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.MastershipRole;
+import org.onosproject.net.flow.FlowRule;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Set;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+public class DefaultRoutingHandler {
+
+    private static Logger log = LoggerFactory.getLogger(DefaultRoutingHandler.class);
+
+    private SegmentRoutingManager srManager;
+    private RoutingRulePopulator rulePopulator;
+    private NetworkConfigHandler config;
+    private Status populationStatus;
+
+    /**
+     * Represents the default routing population status.
+     */
+    public enum Status {
+        // population process is not started yet.
+        IDLE,
+
+        // population process started.
+        STARTED,
+
+        // population process was aborted due to errors, mostly for groups not found.
+        ABORTED,
+
+        // population process was finished successfully.
+        SUCCEEDED
+    }
+
+    /**
+     * Creates a DefaultRoutingHandler object.
+     *
+     * @param srManager SegmentRoutingManager object
+     */
+    public DefaultRoutingHandler(SegmentRoutingManager srManager) {
+        this.srManager = srManager;
+        this.rulePopulator = checkNotNull(srManager.routingRulePopulator);
+        this.config = checkNotNull(srManager.networkConfigHandler);
+        this.populationStatus = Status.IDLE;
+    }
+
+    /**
+     * Populates all routing rules to all connected routers, including default
+     * routing rules, adjacency rules, and policy rules if any.
+     *
+     * @return true if it succeeds in populating all rules, otherwise false
+     */
+    public boolean populateAllRoutingRules() {
+
+        populationStatus = Status.STARTED;
+        log.info("Starts to populate routing rules");
+
+        for (Device sw : srManager.deviceService.getDevices()) {
+            if (srManager.mastershipService.
+                    getLocalRole(sw.id()) != MastershipRole.MASTER) {
+                continue;
+            }
+
+            ECMPShortestPathGraph ecmpSPG = new ECMPShortestPathGraph(sw.id(), srManager);
+            if (!populateEcmpRoutingRules(sw, ecmpSPG)) {
+                populationStatus = Status.ABORTED;
+                log.debug("Abort routing rule population");
+                return false;
+            }
+
+            // TODO: Set adjacency routing rule for all switches
+        }
+
+        populationStatus = Status.SUCCEEDED;
+        log.info("Completes routing rule population");
+        return true;
+    }
+
+    private boolean populateEcmpRoutingRules(Device sw,
+                                             ECMPShortestPathGraph ecmpSPG) {
+
+        HashMap<Integer, HashMap<DeviceId, ArrayList<ArrayList<DeviceId>>>> switchVia =
+                ecmpSPG.getAllLearnedSwitchesAndVia();
+        for (Integer itrIdx : switchVia.keySet()) {
+            HashMap<DeviceId, ArrayList<ArrayList<DeviceId>>> swViaMap =
+                    switchVia.get(itrIdx);
+            for (DeviceId targetSw : swViaMap.keySet()) {
+                DeviceId destSw = sw.id();
+                Set<DeviceId> nextHops = new HashSet<>();
+
+                for (ArrayList<DeviceId> via : swViaMap.get(targetSw)) {
+                    if (via.isEmpty()) {
+                        nextHops.add(destSw);
+                    } else {
+                        nextHops.add(via.get(0));
+                    }
+                }
+                if (!populateEcmpRoutingRulePartial(targetSw, destSw, nextHops)) {
+                    return false;
+                }
+            }
+        }
+
+        return true;
+    }
+
+    private boolean populateEcmpRoutingRulePartial(DeviceId targetSw, DeviceId destSw,
+                                Set<DeviceId> nextHops) {
+        boolean result;
+
+        if (nextHops.isEmpty()) {
+            nextHops.add(destSw);
+        }
+
+        // If both target switch and dest switch are edge routers, then set IP rule
+        // for both subnet and router IP.
+        if (config.isEdgeRouter(targetSw) && config.isEdgeRouter(destSw)) {
+            String subnets = config.getSubnetInfo(destSw);
+            result = rulePopulator.populateIpRuleForSubnet(targetSw, subnets, destSw, nextHops);
+            if (!result) {
+                return false;
+            }
+
+            IpPrefix routerIp = config.getRouterIpAddress(destSw);
+            result = rulePopulator.populateIpRuleForRouter(targetSw, routerIp, destSw, nextHops);
+            if (!result) {
+                return false;
+            }
+
+        // If the target switch is an edge router, then set IP rules for the router IP.
+        } else if (config.isEdgeRouter(targetSw)) {
+            IpPrefix routerIp = config.getRouterIpAddress(destSw);
+            result = rulePopulator.populateIpRuleForRouter(targetSw, routerIp, destSw, nextHops);
+            if (!result) {
+                return false;
+            }
+
+        // If the target switch is an transit router, then set MPLS rules only.
+        } else if (config.isTransitRouter(targetSw)) {
+            result = rulePopulator.populateMplsRule(targetSw, destSw, nextHops);
+            if (!result) {
+                return false;
+            }
+        } else {
+            log.warn("The switch {} is neither an edge router nor a transit router.", targetSw);
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Populates table miss entries for all tables, and pipeline rules for
+     * VLAN and TACM tables.
+     *
+     * @param deviceId Switch ID to set the rules
+     */
+    public void populateTtpRules(DeviceId deviceId) {
+
+        rulePopulator.populateTableMissEntry(deviceId, FlowRule.Type.VLAN,
+                true, false, false, FlowRule.Type.DEFAULT);
+        rulePopulator.populateTableMissEntry(deviceId, FlowRule.Type.ETHER,
+                true, false, false, FlowRule.Type.DEFAULT);
+        rulePopulator.populateTableMissEntry(deviceId, FlowRule.Type.IP,
+                false, true, true, FlowRule.Type.ACL);
+        rulePopulator.populateTableMissEntry(deviceId, FlowRule.Type.MPLS,
+                false, true, true, FlowRule.Type.ACL);
+        rulePopulator.populateTableMissEntry(deviceId, FlowRule.Type.ACL,
+                false, false, false, FlowRule.Type.DEFAULT);
+
+        rulePopulator.populateTableVlan(deviceId);
+        rulePopulator.populateTableTMac(deviceId);
+    }
+
+    /**
+     * Start the flow rule population process if it was never started.
+     * The process finishes successfully when all flow rules are set and
+     * stops with ABORTED status when any groups required for flows is not
+     * set yet.
+     */
+    public void startPopulationProcess() {
+        synchronized (populationStatus) {
+            if (populationStatus == Status.IDLE ||
+                    populationStatus == Status.SUCCEEDED) {
+                populationStatus = Status.STARTED;
+                populateAllRoutingRules();
+            }
+        }
+    }
+
+    /**
+     * Resume the flow rule population process if it was aborted for any reason.
+     * Mostly the process is aborted when the groups required are not set yet.
+     */
+    public void resumePopulationProcess() {
+        synchronized (populationStatus) {
+            if (populationStatus == Status.ABORTED) {
+                populationStatus = Status.STARTED;
+                // TODO: we need to restart from the point aborted instead of restarting.
+                populateAllRoutingRules();
+            }
+        }
+    }
+}

+package org.onosproject.segmentrouting;
+
+import org.onlab.packet.Ip4Address;
+import org.onlab.packet.MacAddress;
+import org.onosproject.grouphandler.DeviceProperties;
+import org.onosproject.net.DeviceId;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class DeviceConfiguration implements DeviceProperties {
+
+    private static final Logger log = LoggerFactory
+            .getLogger(DeviceConfiguration.class);
+    private final List<Integer> allSegmentIds =
+            Arrays.asList(101, 102, 103, 104, 105, 106);
+    private HashMap<DeviceId, Integer> deviceSegmentIdMap =
+            new HashMap<DeviceId, Integer>() {
+                {
+                    put(DeviceId.deviceId("of:0000000000000001"), 101);
+                    put(DeviceId.deviceId("of:0000000000000002"), 102);
+                    put(DeviceId.deviceId("of:0000000000000003"), 103);
+                    put(DeviceId.deviceId("of:0000000000000004"), 104);
+                    put(DeviceId.deviceId("of:0000000000000005"), 105);
+                    put(DeviceId.deviceId("of:0000000000000006"), 106);
+                }
+            };
+    private final HashMap<DeviceId, MacAddress> deviceMacMap =
+            new HashMap<DeviceId, MacAddress>() {
+                {
+                    put(DeviceId.deviceId("of:0000000000000001"),
+                            MacAddress.valueOf("00:00:00:00:00:01"));
+                    put(DeviceId.deviceId("of:0000000000000002"),
+                            MacAddress.valueOf("00:00:00:00:00:02"));
+                    put(DeviceId.deviceId("of:0000000000000003"),
+                            MacAddress.valueOf("00:00:00:00:00:03"));
+                    put(DeviceId.deviceId("of:0000000000000004"),
+                            MacAddress.valueOf("00:00:00:00:00:04"));
+                    put(DeviceId.deviceId("of:0000000000000005"),
+                            MacAddress.valueOf("00:00:00:00:00:05"));
+                    put(DeviceId.deviceId("of:0000000000000006"),
+                            MacAddress.valueOf("00:00:00:00:00:06"));
+                }
+            };
+
+    private final HashMap<DeviceId, Ip4Address> deviceIpMap =
+            new HashMap<DeviceId, Ip4Address>() {
+                {
+                    put(DeviceId.deviceId("of:0000000000000001"),
+                            Ip4Address.valueOf("192.168.0.1"));
+                    put(DeviceId.deviceId("of:0000000000000002"),
+                            Ip4Address.valueOf("192.168.0.2"));
+                    put(DeviceId.deviceId("of:0000000000000003"),
+                            Ip4Address.valueOf("192.168.0.3"));
+                    put(DeviceId.deviceId("of:0000000000000004"),
+                            Ip4Address.valueOf("192.168.0.4"));
+                    put(DeviceId.deviceId("of:0000000000000005"),
+                            Ip4Address.valueOf("192.168.0.5"));
+                    put(DeviceId.deviceId("of:0000000000000006"),
+                            Ip4Address.valueOf("192.168.0.6"));
+                }
+            };
+
+    @Override
+    public int getSegmentId(DeviceId deviceId) {
+        if (deviceSegmentIdMap.get(deviceId) != null) {
+            log.debug("getSegmentId for device{} is {}",
+                    deviceId,
+                    deviceSegmentIdMap.get(deviceId));
+            return deviceSegmentIdMap.get(deviceId);
+        } else {
+            throw new IllegalStateException();
+        }
+    }
+
+
+    @Override
+    public MacAddress getDeviceMac(DeviceId deviceId) {
+        if (deviceMacMap.get(deviceId) != null) {
+            log.debug("getDeviceMac for device{} is {}",
+                    deviceId,
+                    deviceMacMap.get(deviceId));
+            return deviceMacMap.get(deviceId);
+        } else {
+            throw new IllegalStateException();
+        }
+    }
+
+
+    @Override
+    public boolean isEdgeDevice(DeviceId deviceId) {
+        if (deviceId.equals(DeviceId.deviceId("of:0000000000000001"))
+                || deviceId.equals(DeviceId.deviceId("of:0000000000000006"))) {
+            return true;
+        }
+
+        return false;
+    }
+
+    @Override
+    public List<Integer> getAllDeviceSegmentIds() {
+        return allSegmentIds;
+    }
+
+
+    /**
+     * Returns Segment ID for the router with the MAC address given.
+     *
+     * @param targetMac Mac address for the router
+     * @return Segment ID for the router with the MAC address
+     */
+    public int getSegmentId(MacAddress targetMac) {
+        for (Map.Entry<DeviceId, MacAddress> entry: deviceMacMap.entrySet()) {
+            if (entry.getValue().equals(targetMac)) {
+                return deviceSegmentIdMap.get(entry.getKey());
+            }
+        }
+
+        return -1;
+    }
+
+    /**
+     * Returns Segment ID for the router withe IP address given.
+     *
+     * @param targetAddress IP address of the router
+     * @return Segment ID for the router with the IP address
+     */
+    public int getSegmentId(Ip4Address targetAddress) {
+        for (Map.Entry<DeviceId, Ip4Address> entry: deviceIpMap.entrySet()) {
+            if (entry.getValue().equals(targetAddress)) {
+                return deviceSegmentIdMap.get(entry.getKey());
+            }
+        }
+
+        return -1;
+    }
+
+    /**
+     * Returns Router IP address for the router with the device ID given.
+     *
+     * @param deviceId device ID of the router
+     * @return IP address of the router
+     */
+    public Ip4Address getRouterIp(DeviceId deviceId) {
+        if (deviceIpMap.get(deviceId) != null) {
+            log.debug("getDeviceIp for device{} is {}",
+                    deviceId,
+                    deviceIpMap.get(deviceId));
+            return deviceIpMap.get(deviceId);
+        } else {
+            throw new IllegalStateException();
+        }
+    }
+
+    /**
+     * Returns the Device ID of the router with the Segment ID given.
+     *
+     * @param sid Segment ID of the router
+     * @return Device ID of the router
+     */
+    public DeviceId getDeviceId(int sid) {
+        for (Map.Entry<DeviceId, Integer> entry: deviceSegmentIdMap.entrySet()) {
+            if (entry.getValue() == sid) {
+                return entry.getKey();
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * Returns the Device ID of the router with the IP address given.
+     *
+     * @param ipAddress IP address of the router
+     * @return Device ID of the router
+     */
+    public DeviceId getDeviceId(Ip4Address ipAddress) {
+        for (Map.Entry<DeviceId, Ip4Address> entry: deviceIpMap.entrySet()) {
+            if (entry.getValue().equals(ipAddress)) {
+                return entry.getKey();
+            }
+        }
+
+        return null;
+    }
+}

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.segmentrouting;
+
+import java.nio.ByteBuffer;
+
+import org.onlab.packet.Ethernet;
+import org.onlab.packet.ICMP;
+import org.onlab.packet.IPv4;
+import org.onlab.packet.Ip4Address;
+import org.onlab.packet.IpPrefix;
+import org.onlab.packet.MPLS;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.flow.DefaultTrafficTreatment;
+import org.onosproject.net.flow.TrafficTreatment;
+import org.onosproject.net.packet.DefaultOutboundPacket;
+import org.onosproject.net.packet.InboundPacket;
+import org.onosproject.net.packet.OutboundPacket;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+public class IcmpHandler {
+
+    private static Logger log = LoggerFactory.getLogger(IcmpHandler.class);
+    private SegmentRoutingManager srManager;
+    private NetworkConfigHandler config;
+
+    /**
+     * Creates an IcmpHandler object.
+     *
+     * @param srManager SegmentRoutingManager object
+     */
+    public IcmpHandler(SegmentRoutingManager srManager) {
+        this.srManager = srManager;
+        this.config = checkNotNull(srManager.networkConfigHandler);
+    }
+
+    /**
+     * Process incoming ICMP packet.
+     * If it is an ICMP request to router or known host, then sends an ICMP response.
+     * If it is an ICMP packet to known host and forward the packet to the host.
+     * If it is an ICMP packet to unknown host in a subnet, then sends an ARP request
+     * to the subnet.
+     *
+     * @param pkt
+     */
+    public void processPacketIn(InboundPacket pkt) {
+
+        Ethernet ethernet = pkt.parsed();
+        IPv4 ipv4 = (IPv4) ethernet.getPayload();
+
+        ConnectPoint connectPoint = pkt.receivedFrom();
+        DeviceId deviceId = connectPoint.deviceId();
+        Ip4Address destinationAddress =
+                Ip4Address.valueOf(ipv4.getDestinationAddress());
+        Ip4Address gatewayIpAddress = config.getGatewayIpAddress(deviceId);
+        IpPrefix routerIpPrefix = config.getRouterIpAddress(deviceId);
+        Ip4Address routerIpAddress = routerIpPrefix.getIp4Prefix().address();
+
+        // ICMP to the router IP or gateway IP
+        if (((ICMP) ipv4.getPayload()).getIcmpType() == ICMP.TYPE_ECHO_REQUEST &&
+                (destinationAddress.equals(routerIpAddress) ||
+                        gatewayIpAddress.equals(destinationAddress))) {
+            sendICMPResponse(ethernet, connectPoint);
+            // TODO: do we need to set the flow rule again ??
+
+        // ICMP for any known host
+        } else if (!srManager.hostService.getHostsByIp(destinationAddress).isEmpty()) {
+            srManager.ipHandler.forwardPackets(deviceId, destinationAddress);
+
+        // ICMP for an unknown host in the subnet of the router
+        } else if (config.inSameSubnet(deviceId, destinationAddress)) {
+            srManager.arpHandler.sendArpRequest(deviceId, destinationAddress, connectPoint);
+
+        // ICMP for an unknown host
+        } else {
+            log.debug("ICMP request for unknown host {} ", destinationAddress);
+            // Do nothing
+        }
+    }
+
+    private void sendICMPResponse(Ethernet icmpRequest, ConnectPoint outport) {
+
+        Ethernet icmpReplyEth = new Ethernet();
+
+        IPv4 icmpRequestIpv4 = (IPv4) icmpRequest.getPayload();
+        IPv4 icmpReplyIpv4 = new IPv4();
+
+        int destAddress = icmpRequestIpv4.getDestinationAddress();
+        icmpReplyIpv4.setDestinationAddress(icmpRequestIpv4.getSourceAddress());
+        icmpReplyIpv4.setSourceAddress(destAddress);
+        icmpReplyIpv4.setTtl((byte) 64);
+        icmpReplyIpv4.setChecksum((short) 0);
+
+        ICMP icmpReply = (ICMP) icmpRequestIpv4.getPayload().clone();
+        icmpReply.setIcmpType(ICMP.TYPE_ECHO_REPLY);
+        icmpReply.setIcmpCode(ICMP.SUBTYPE_ECHO_REPLY);
+        icmpReply.setChecksum((short) 0);
+
+        icmpReplyIpv4.setPayload(icmpReply);
+
+        icmpReplyEth.setPayload(icmpReplyIpv4);
+        icmpReplyEth.setEtherType(Ethernet.TYPE_IPV4);
+        icmpReplyEth.setDestinationMACAddress(icmpRequest.getSourceMACAddress());
+        icmpReplyEth.setSourceMACAddress(icmpRequest.getDestinationMACAddress());
+        icmpReplyEth.setVlanID(icmpRequest.getVlanID());
+
+        Ip4Address destIpAddress = Ip4Address.valueOf(icmpReplyIpv4.getDestinationAddress());
+        Ip4Address destRouterAddress = config.getDestinationRouterAddress(destIpAddress);
+        int sid = config.getMplsId(destRouterAddress);
+        if (sid < 0) {
+            log.warn("Cannot find the Segment ID for {}", destAddress);
+            return;
+        }
+
+        sendPacketOut(outport, icmpReplyEth, sid);
+
+    }
+
+    private void sendPacketOut(ConnectPoint outport, Ethernet payload, int sid) {
+
+        IPv4 ipPacket = (IPv4) payload.getPayload();
+        Ip4Address destIpAddress = Ip4Address.valueOf(ipPacket.getDestinationAddress());
+
+        if (sid == -1 || config.getMplsId(payload.getDestinationMAC()) == sid ||
+                config.inSameSubnet(outport.deviceId(), destIpAddress)) {
+            TrafficTreatment treatment = DefaultTrafficTreatment.builder().
+                    setOutput(outport.port()).build();
+            OutboundPacket packet = new DefaultOutboundPacket(outport.deviceId(),
+                    treatment, ByteBuffer.wrap(payload.serialize()));
+            srManager.packetService.emit(packet);
+        } else {
+            log.warn("Send a MPLS packet as a ICMP response");
+            TrafficTreatment treatment = DefaultTrafficTreatment.builder()
+                    .setOutput(outport.port())
+                    .build();
+
+            payload.setEtherType(Ethernet.MPLS_UNICAST);
+            MPLS mplsPkt = new MPLS();
+            mplsPkt.setLabel(sid);
+            mplsPkt.setTtl(((IPv4) payload.getPayload()).getTtl());
+            mplsPkt.setPayload(payload.getPayload());
+            payload.setPayload(mplsPkt);
+
+            OutboundPacket packet = new DefaultOutboundPacket(outport.deviceId(),
+                    treatment, ByteBuffer.wrap(payload.serialize()));
+
+            srManager.packetService.emit(packet);
+        }
+    }
+}

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.segmentrouting;
+
+import org.onlab.packet.Ethernet;
+import org.onlab.packet.IPv4;
+import org.onlab.packet.Ip4Address;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.Host;
+import org.onosproject.net.flow.DefaultTrafficTreatment;
+import org.onosproject.net.flow.TrafficTreatment;
+import org.onosproject.net.packet.DefaultOutboundPacket;
+import org.onosproject.net.packet.InboundPacket;
+import org.onosproject.net.packet.OutboundPacket;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.nio.ByteBuffer;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentLinkedQueue;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+public class IpHandler {
+
+    private static Logger log = LoggerFactory.getLogger(IpHandler.class);
+    private SegmentRoutingManager srManager;
+    private NetworkConfigHandler config;
+    private ConcurrentHashMap<Ip4Address, ConcurrentLinkedQueue<IPv4>> ipPacketQueue;
+
+    /**
+     * Creates an IpHandler object.
+     *
+     * @param srManager SegmentRoutingManager object
+     */
+    public IpHandler(SegmentRoutingManager srManager) {
+        this.srManager = srManager;
+        this.config = checkNotNull(srManager.networkConfigHandler);
+        ipPacketQueue = new ConcurrentHashMap<Ip4Address, ConcurrentLinkedQueue<IPv4>>();
+    }
+
+    /**
+     * Processes incoming IP packets.
+     *
+     * If it is an IP packet for known host, then forward it to the host.
+     * If it is an IP packet for unknown host in subnet, then send an ARP request
+     * to the subnet.
+     *
+     * @param pkt incoming packet
+     */
+    public void processPacketIn(InboundPacket pkt) {
+        Ethernet ethernet = pkt.parsed();
+        IPv4 ipv4 = (IPv4) ethernet.getPayload();
+
+        ConnectPoint connectPoint = pkt.receivedFrom();
+        DeviceId deviceId = connectPoint.deviceId();
+        Ip4Address destinationAddress =
+                Ip4Address.valueOf(ipv4.getDestinationAddress());
+
+        // IP packet for know hosts
+        if (!srManager.hostService.getHostsByIp(destinationAddress).isEmpty()) {
+            forwardPackets(deviceId, destinationAddress);
+
+        // IP packet for unknown host in the subnet of the router
+        } else if (config.inSameSubnet(deviceId, destinationAddress)) {
+            srManager.arpHandler.sendArpRequest(deviceId, destinationAddress, connectPoint);
+
+        // IP packets for unknown host
+        } else {
+            log.debug("ICMP request for unknown host {} which is not in the subnet",
+                    destinationAddress);
+            // Do nothing
+        }
+    }
+
+    /**
+     * Adds the IP packet to a buffer.
+     * The packets are forwarded to corresponding destination when the destination
+     * MAC address is known via ARP response.
+     *
+     * @param ipPacket IP packet to add to the buffer
+     */
+    public void addToPacketBuffer(IPv4 ipPacket) {
+
+        // Better not buffer TPC packets due to out-of-order packet transfer
+        if (ipPacket.getProtocol() == IPv4.PROTOCOL_TCP) {
+            return;
+        }
+
+        Ip4Address destIpAddress = Ip4Address.valueOf(ipPacket.getDestinationAddress());
+
+        if (ipPacketQueue.get(destIpAddress) == null) {
+            ConcurrentLinkedQueue<IPv4> queue = new ConcurrentLinkedQueue<IPv4>();
+            queue.add(ipPacket);
+            ipPacketQueue.put(destIpAddress, queue);
+        } else {
+            ipPacketQueue.get(destIpAddress).add(ipPacket);
+        }
+    }
+
+    /**
+     * Forwards IP packets in the buffer to the destination IP address.
+     * It is called when the controller finds the destination MAC address
+     * via ARP responsees.
+     *
+     * @param deviceId switch device ID
+     * @param destIpAddress destination IP address
+     */
+    public void forwardPackets(DeviceId deviceId, Ip4Address destIpAddress) {
+        for (IPv4 ipPacket : ipPacketQueue.get(destIpAddress)) {
+            Ip4Address destAddress = Ip4Address.valueOf(ipPacket.getDestinationAddress());
+            if (ipPacket != null && config.inSameSubnet(deviceId, destAddress)) {
+                ipPacket.setTtl((byte) (ipPacket.getTtl() - 1));
+                ipPacket.setChecksum((short) 0);
+                for (Host dest: srManager.hostService.getHostsByIp(destIpAddress)) {
+                    Ethernet eth = new Ethernet();
+                    eth.setDestinationMACAddress(dest.mac());
+                    eth.setSourceMACAddress(config.getRouterMacAddress(
+                            deviceId));
+                    eth.setEtherType(Ethernet.TYPE_IPV4);
+                    eth.setPayload(ipPacket);
+
+                    TrafficTreatment treatment = DefaultTrafficTreatment.builder().
+                            setOutput(dest.location().port()).build();
+                    OutboundPacket packet = new DefaultOutboundPacket(deviceId,
+                            treatment, ByteBuffer.wrap(eth.serialize()));
+                    srManager.packetService.emit(packet);
+                }
+            }
+        }
+    }
+}

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.segmentrouting;
+
+import com.google.common.collect.Lists;
+import org.onlab.packet.Ip4Address;
+import org.onlab.packet.Ip4Prefix;
+import org.onlab.packet.IpPrefix;
+import org.onlab.packet.MacAddress;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.Link;
+import org.onosproject.net.PortNumber;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.net.URI;
+import java.util.List;
+import java.util.Set;
+
+/**
+ * This class is temporary class and used only for test.
+ * It will be replaced with "real" Network Config Manager.
+ */
+
+public class NetworkConfigHandler {
+
+    private static Logger log = LoggerFactory.getLogger(NetworkConfigHandler.class);
+    private SegmentRoutingManager srManager;
+    private DeviceConfiguration deviceConfig = new DeviceConfiguration();
+
+    public NetworkConfigHandler(SegmentRoutingManager srManager) {
+        this.srManager = srManager;
+    }
+
+    public Ip4Address getGatewayIpAddress(DeviceId deviceId) {
+
+        if (deviceId.uri().equals(URI.create("of:0000000000000001"))) {
+            return Ip4Address.valueOf("10.0.1.128");
+        } else if (deviceId.uri().equals(URI.create("of:0000000000000006"))) {
+            return Ip4Address.valueOf("7.7.7.128");
+        }
+
+        log.warn("No gateway Ip address was found for {}", deviceId);
+        return Ip4Address.valueOf("0.0.0.0");
+    }
+
+    public IpPrefix getRouterIpAddress(DeviceId deviceId) {
+
+        return IpPrefix.valueOf(deviceConfig.getRouterIp(deviceId), 32);
+    }
+
+    public MacAddress getRouterMacAddress(DeviceId deviceId) {
+        return deviceConfig.getDeviceMac(deviceId);
+    }
+
+    public boolean inSameSubnet(DeviceId deviceId, Ip4Address destIp) {
+
+        String subnetInfo = getSubnetInfo(deviceId);
+        if (subnetInfo == null) {
+            return false;
+        }
+
+        IpPrefix prefix = IpPrefix.valueOf(subnetInfo);
+        if (prefix.contains(destIp)) {
+            return true;
+        }
+
+        return false;
+    }
+
+    public boolean inSameSubnet(Ip4Address address, int sid) {
+        DeviceId deviceId = deviceConfig.getDeviceId(sid);
+        if (deviceId == null) {
+            log.warn("Cannot find a device for SID {}", sid);
+            return false;
+        }
+
+        String subnetInfo = getSubnetInfo(deviceId);
+        if (subnetInfo == null) {
+            log.warn("Cannot find the subnet info for {}", deviceId);
+            return false;
+        }
+
+        Ip4Prefix subnet = Ip4Prefix.valueOf(subnetInfo);
+        if (subnet.contains(address)) {
+            return true;
+        }
+
+        return false;
+
+    }
+
+    public String getSubnetInfo(DeviceId deviceId) {
+        // TODO : supports multiple subnet
+        if (deviceId.uri().equals(URI.create("of:0000000000000001"))) {
+            return "10.0.1.1/24";
+        } else if (deviceId.uri().equals(URI.create("of:0000000000000006"))) {
+            return "7.7.7.7/24";
+        } else {
+            log.error("Switch {} is not an edge router", deviceId);
+            return null;
+        }
+    }
+
+    public int getMplsId(DeviceId deviceId) {
+        return deviceConfig.getSegmentId(deviceId);
+    }
+
+    public int getMplsId(MacAddress mac) {
+        return deviceConfig.getSegmentId(mac);
+    }
+
+    public int getMplsId(Ip4Address address) {
+        return deviceConfig.getSegmentId(address);
+    }
+
+    public boolean isEcmpNotSupportedInTransit(DeviceId deviceId) {
+        return false;
+    }
+
+    public boolean isTransitRouter(DeviceId deviceId) {
+        return true;
+    }
+
+
+    public boolean isEdgeRouter(DeviceId deviceId) {
+        if (deviceId.uri().equals(URI.create("of:0000000000000001"))
+                || deviceId.uri().equals(URI.create("of:0000000000000006"))) {
+            return true;
+        }
+
+        return false;
+    }
+
+    private List<PortNumber> getPortsToNeighbors(DeviceId deviceId, List<DeviceId> fwdSws) {
+
+        List<PortNumber> portNumbers = Lists.newArrayList();
+
+        Set<Link> links = srManager.linkService.getDeviceEgressLinks(deviceId);
+        for (Link link: links) {
+            for (DeviceId swId: fwdSws) {
+                if (link.dst().deviceId().equals(swId)) {
+                    portNumbers.add(link.src().port());
+                    break;
+                }
+            }
+        }
+
+        return portNumbers;
+    }
+
+    public List<PortNumber> getPortsToDevice(DeviceId deviceId) {
+        List<PortNumber> portNumbers = Lists.newArrayList();
+
+        Set<Link> links = srManager.linkService.getDeviceEgressLinks(deviceId);
+        for (Link link: links) {
+            if (link.dst().deviceId().equals(deviceId)) {
+                portNumbers.add(link.src().port());
+            }
+        }
+
+        return portNumbers;
+    }
+
+
+    public Ip4Address getDestinationRouterAddress(Ip4Address destIpAddress) {
+        // TODO: need to check the subnet info
+        if (destIpAddress.toString().equals("10.0.1.1")) {
+            return Ip4Address.valueOf("192.168.0.1");
+        } else if (destIpAddress.toString().equals("7.7.7.7")) {
+            return Ip4Address.valueOf("192.168.0.6");
+        } else {
+            log.warn("No router was found for {}", destIpAddress);
+            return null;
+        }
+
+    }
+
+    public DeviceId getDeviceId(Ip4Address ip4Address) {
+        return deviceConfig.getDeviceId(ip4Address);
+    }
+
+    public MacAddress getRouterMac(Ip4Address targetAddress) {
+        if (targetAddress.toString().equals("10.0.1.128")) {
+            return MacAddress.valueOf("00:00:00:00:00:01");
+        } else if (targetAddress.toString().equals("7.7.7.128")) {
+            return MacAddress.valueOf("00:00:00:00:00:06");
+        } else {
+            log.warn("Cannot find a router for {}", targetAddress);
+            return null;
+        }
+    }
+}

@@ -345,7 +345,8 @@ public final class KryoNamespaces {
                     MplsLabelResourceAllocation.class,
                     MplsLabelResourceAllocation.class,
                     MplsLabelResourceRequest.class,
                     MplsLabelResourceRequest.class,
                     MplsLabel.class,
                     MplsLabel.class,
-                    org.onlab.packet.MplsLabel.class
+                    org.onlab.packet.MplsLabel.class,
+                    org.onlab.packet.MPLS.class
                     )
                     )
 
 
             .build();
             .build();

@@ -285,4 +285,18 @@
         <bundle>mvn:org.onosproject/onos-app-calendar/@ONOS-VERSION</bundle>
         <bundle>mvn:org.onosproject/onos-app-calendar/@ONOS-VERSION</bundle>
     </feature>
     </feature>
 
 
+    <feature name="onos-app-grouphandler" version="@FEATURE-VERSION"
+             description="Group Handler Sample App">
+        <feature>onos-api</feature>
+        <bundle>mvn:org.onosproject/onos-app-grouphandler/@ONOS-VERSION</bundle>
+    </feature>
+
+    <feature name="onos-app-segmentrouting" version="@FEATURE-VERSION"
+             description="Segment routing application">
+        <feature>onos-api</feature>
+        <bundle>mvn:org.onosproject/onos-app-segmentrouting/@ONOS-VERSION</bundle>
+        <bundle>mvn:org.onosproject/onos-app-grouphandler/@ONOS-VERSION</bundle>
+    </feature>
+
+
 </features>
 </features>

@@ -70,7 +70,7 @@ public final class DriverManager implements OpenFlowSwitchDriverFactory {
         if (vendor.startsWith("Stanford University, Ericsson Research and CPqD Research")
         if (vendor.startsWith("Stanford University, Ericsson Research and CPqD Research")
                 &&
                 &&
                 hw.startsWith("OpenFlow 1.3 Reference Userspace Switch")) {
                 hw.startsWith("OpenFlow 1.3 Reference Userspace Switch")) {
-            return new OFSwitchImplCPqD13(dpid, desc);
+            return new OFSwitchImplSpringOpenTTP(dpid, desc);
         }
         }
 
 
         if (hw.startsWith("Open vSwitch")) {
         if (hw.startsWith("Open vSwitch")) {

+package org.onlab.packet;
+
+import java.nio.ByteBuffer;
+import java.util.HashMap;
+import java.util.Map;
+
+public class MPLS extends BasePacket {
+    public static final int ADDRESS_LENGTH = 4;
+    public static final byte PROTOCOL_IPV4 = 0x1;
+    public static final byte PROTOCOL_MPLS = 0x6;
+    public static final Map<Byte, Class<? extends IPacket>> PROTOCOL_CLASS_MAP;
+
+    static {
+        PROTOCOL_CLASS_MAP = new HashMap<Byte, Class<? extends IPacket>>();
+        PROTOCOL_CLASS_MAP.put(PROTOCOL_IPV4, IPv4.class);
+        PROTOCOL_CLASS_MAP.put(PROTOCOL_MPLS, MPLS.class);
+    }
+
+    protected int label; //20bits
+    protected byte bos; //1bit
+    protected byte ttl; //8bits
+    protected byte protocol;
+
+    /**
+     * Default constructor that sets the version to 4.
+     */
+    public MPLS() {
+        super();
+        this.bos = 1;
+        this.protocol = PROTOCOL_IPV4;
+    }
+
+    @Override
+    public byte[] serialize() {
+        byte[] payloadData = null;
+        if (payload != null) {
+            payload.setParent(this);
+            payloadData = payload.serialize();
+        }
+
+        byte[] data = new byte[(4 + ((payloadData != null) ? payloadData.length : 0)) ];
+        ByteBuffer bb = ByteBuffer.wrap(data);
+
+        bb.putInt(((this.label & 0x000fffff) << 12) | ((this.bos & 0x1) << 8 | (this.ttl & 0xff)));
+        if (payloadData != null) {
+            bb.put(payloadData);
+        }
+
+        return data;
+    }
+
+    @Override
+    public IPacket deserialize(byte[] data, int offset, int length) {
+        ByteBuffer bb = ByteBuffer.wrap(data, offset, length);
+
+        int mplsheader = bb.getInt();
+        this.label = ((mplsheader & 0xfffff000) >> 12);
+        this.bos = (byte) ((mplsheader & 0x00000100) >> 8);
+        this.bos = (byte) (mplsheader & 0x000000ff);
+        this.protocol = (this.bos == 1) ? PROTOCOL_IPV4 : PROTOCOL_MPLS;
+
+        IPacket payload;
+        if (IPv4.PROTOCOL_CLASS_MAP.containsKey(this.protocol)) {
+            Class<? extends IPacket> clazz = IPv4.PROTOCOL_CLASS_MAP.get(this.protocol);
+            try {
+                payload = clazz.newInstance();
+            } catch (Exception e) {
+                throw new RuntimeException("Error parsing payload for MPLS packet", e);
+            }
+        } else {
+            payload = new Data();
+        }
+        this.payload = payload.deserialize(data, bb.position(), bb.limit() - bb.position());
+        this.payload.setParent(this);
+
+        return this;
+    }
+
+    /**
+     * Returns the MPLS label.
+     *
+     * @return MPLS label
+     */
+    public int getLabel() {
+        return label;
+    }
+
+    /**
+     * Sets the MPLS label.
+     *
+     * @param label
+     */
+    public void setLabel(int label) {
+        this.label = label;
+    }
+
+    /**
+     * Returns the MPLS TTL of the packet.
+     *
+     * @return MPLS TTL of the packet
+     */
+    public byte getTtl() {
+        return ttl;
+    }
+
+    /**
+     * Sets the MPLS TTL of the packet.
+     *
+     * @param ttl MPLS TTL
+     */
+    public void setTtl(byte ttl) {
+        this.ttl = ttl;
+    }
+
+}