SONA: openstackSwitching

 - Added event handlers  (DEVICE_XX, PORT_XXX) and tested with mininet
 - Added default flow rule setup for ARP and DHCP
 - Added neutron network API handler
 - Added the feature to populate flow rules for the same subnet
 - Added the feature to populate flow rules for VMs in other Cnode using Nicira ext.
 - Modified the directory structure
 - Fixed nicira ext handling logic
 - Fixed neutron network API handler
 - Added the tenant isolation feature by checking the source IP address

Change-Id: I076d21f3c90f458727e33cb36b47d9b14ccfd68f

+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ 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.
+  -->
+<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/maven-v4_0_0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>org.onosproject</groupId>
+        <artifactId>onos-apps</artifactId>
+        <version>1.4.0-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+
+    <artifactId>onos-app-openstackswitching</artifactId>
+    <packaging>bundle</packaging>
+
+    <description>SONA Openstack Switching  applications</description>
+    <properties>
+        <onos.version>1.4.0-SNAPSHOT</onos.version>
+        <onos.app.name>org.onosproject.openstackswitching</onos.app.name>
+        <web.context>/onos/openstackswitching</web.context>
+        <api.version>1.0.0</api.version>
+        <api.title>ONOS OpenStack Switching REST API</api.title>
+        <api.description>
+            APIs for receiving Neutron information.
+        </api.description>
+        <api.package>org.onosproject.openstackswitching.web</api.package>
+        <onos.app.origin>SKT, Inc.</onos.app.origin>
+    </properties>
+
+
+    <dependencies>
+        <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onos-rest</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onlab-rest</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>javax.ws.rs</groupId>
+            <artifactId>jsr311-api</artifactId>
+            <version>1.1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>com.sun.jersey</groupId>
+            <artifactId>jersey-servlet</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-annotations</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.osgi</groupId>
+            <artifactId>org.osgi.compendium</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.osgi</groupId>
+            <artifactId>org.osgi.core</artifactId>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.felix</groupId>
+                <artifactId>maven-bundle-plugin</artifactId>
+                <extensions>true</extensions>
+                <configuration>
+                    <instructions>
+                        <_wab>src/main/webapp/</_wab>
+                        <Bundle-SymbolicName>
+                            ${project.groupId}.${project.artifactId}
+                        </Bundle-SymbolicName>
+                        <Import-Package>
+                            org.slf4j,
+                            org.osgi.framework,
+                            javax.ws.rs,
+                            javax.ws.rs.core,
+                            com.sun.jersey.api.core,
+                            com.sun.jersey.spi.container.servlet,
+                            com.sun.jersey.server.impl.container.servlet,
+                            com.fasterxml.jackson.databind,
+                            com.fasterxml.jackson.databind.node,
+                            com.fasterxml.jackson.core,
+                            org.apache.karaf.shell.commands,
+                            com.google.common.*,
+                            org.onlab.packet.*,
+                            org.onosproject.*
+                        </Import-Package>
+                        <Web-ContextPath>${web.context}</Web-ContextPath>
+                    </instructions>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+
+</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.openstackswitching;
+
+import org.onosproject.net.packet.InboundPacket;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+
+/**
+ * It handles ARP packet from VMs.
+ */
+public class OpenstackArpHandler {
+
+    private static Logger log = LoggerFactory
+            .getLogger(OpenstackArpHandler.class);
+
+    HashMap<String, OpenstackPort> openstackPortHashMap;
+
+    /**
+     * Returns OpenstackArpHandler reference.
+     *
+     * @param openstackPortMap
+     */
+    public OpenstackArpHandler(HashMap<String, OpenstackPort> openstackPortMap) {
+        this.openstackPortHashMap = openstackPortMap;
+    }
+
+    /**
+     * Processes ARP packets.
+     *
+     * @param pkt ARP request packet
+     */
+    public void processPacketIn(InboundPacket pkt) {
+        log.warn("Received an ARP 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.openstackswitching;
+
+import org.onosproject.net.packet.InboundPacket;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * It handles DHCP request packets.
+ */
+public class OpenstackDhcpHandler {
+
+    private static Logger log = LoggerFactory
+            .getLogger(OpenstackDhcpHandler.class);
+
+    /**
+     * Returns OpenstackDhcpHandler reference.
+     */
+    public OpenstackDhcpHandler() {
+
+    }
+
+    /**
+     * Processes DHCP request packets.
+     *
+     * @param pkt DHCP request packet
+     */
+    public void processPacketIn(InboundPacket pkt) {
+        log.warn("Received a DHCP 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.openstackswitching;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+
+/**
+ * Represents the network information given by Neutron.
+ */
+public final class OpenstackNetwork {
+
+    private String name;
+    private String tenantId;
+    private String segmentId;
+    private String networkType;
+    private String id;
+
+    /**
+     * Returns the builder object of the OpenstackNetwork class.
+     *
+     * @return OpenstackNetwork builder object
+     */
+    public static OpenstackNetwork.Builder builder() {
+        return new Builder();
+    }
+
+    private OpenstackNetwork(String name, String tenantId, String id, String sid,
+                             String type) {
+        this.name = checkNotNull(name);
+        this.tenantId = checkNotNull(tenantId);
+        this.segmentId = checkNotNull(sid);
+        this.id = checkNotNull(id);
+        this.networkType = checkNotNull(type);
+    }
+
+    public String name() {
+        return this.name;
+    }
+
+    public String tenantId() {
+        return this.tenantId;
+    }
+
+    public String id() {
+        return this.id;
+    }
+
+    public String segmentId() {
+        return this.segmentId;
+    }
+
+    public String networkType() {
+        return this.networkType;
+    }
+
+    public static final class Builder {
+        private String name;
+        private String tenantId;
+        private String id;
+        private String sid;
+        private String networkType;
+
+        public Builder name(String name) {
+            this.name = name;
+
+            return this;
+        }
+
+        public Builder tenantId(String tenantId) {
+            this.tenantId = tenantId;
+
+            return this;
+        }
+
+        public Builder id(String id) {
+            this.id = id;
+
+            return this;
+        }
+
+        public Builder segmentId(String sid) {
+            this.sid = sid;
+
+            return this;
+        }
+
+        public Builder networkType(String type) {
+            this.networkType = type;
+
+            return this;
+        }
+
+        public OpenstackNetwork build() {
+            return new OpenstackNetwork(name, tenantId, id, sid, networkType);
+        }
+
+    }
+}

+/*
+ * 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.openstackswitching;
+
+import com.google.common.collect.Lists;
+import org.onlab.packet.Ip4Address;
+import org.onlab.packet.MacAddress;
+
+import java.util.HashMap;
+import java.util.List;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * It represents the Openstack Port information.
+ */
+public final class OpenstackPort {
+
+    public enum PortStatus {
+        UP,
+        DOWN
+    }
+
+    private PortStatus status;
+    private String name;
+    // FIX_ME
+    private String allowedAddressPairs;
+    private boolean adminStateUp;
+    private String networkId;
+    private String tenantId;
+    private String deviceOwner;
+    private MacAddress macAddress;
+    // <subnet id, ip address>
+    private HashMap<String, Ip4Address> fixedIps;
+    private String id;
+    private List<String> securityGroups;
+    private String deviceId;
+
+    private OpenstackPort(PortStatus status, String name, boolean adminStateUp,
+                          String networkId, String tenantId, String deviceOwner,
+                          MacAddress macAddress, HashMap fixedIps, String id,
+                          List<String> securityGroups, String deviceId) {
+
+        this.status = status;
+        this.name = name;
+        this.adminStateUp = adminStateUp;
+        this.networkId = checkNotNull(networkId);
+        this.tenantId = checkNotNull(tenantId);
+        this.deviceOwner = deviceOwner;
+        this.macAddress = checkNotNull(macAddress);
+        this.fixedIps = checkNotNull(fixedIps);
+        this.id = checkNotNull(id);
+        this.securityGroups = securityGroups;
+        this.deviceId = deviceId;
+    }
+
+
+
+    /**
+     * Returns OpenstackPort builder object.
+     *
+     * @return OpenstackPort builder
+     */
+    public static OpenstackPort.Builder builder() {
+        return new Builder();
+    }
+
+    /**
+     * Returns port status.
+     *
+     * @return port status
+     */
+    public PortStatus status() {
+        return status;
+    }
+
+    /**
+     * Returns port name.
+     *
+     * @return port name
+     */
+    public String name() {
+        return name;
+    }
+
+    /**
+     * Returns whether admin state up or not.
+     *
+     * @return true if admin state up, false otherwise
+     */
+    public boolean isAdminStateUp() {
+        return adminStateUp;
+    }
+
+    /**
+     * Returns network ID.
+     *
+     * @return network ID
+     */
+    public String networkId() {
+        return networkId;
+    }
+
+    /**
+     * Returns device owner.
+     *
+     * @return device owner
+     */
+    public String deviceOwner() {
+        return deviceOwner;
+    }
+
+    /**
+     * Returns mac address.
+     *
+     * @return mac address
+     */
+    public MacAddress macAddress() {
+        return macAddress;
+    }
+
+    /**
+     * Returns the fixed IP information.
+     *
+     * @return fixed IP info
+     */
+    public HashMap fixedIps() {
+        return fixedIps;
+    }
+
+    /**
+     * Returns port ID.
+     *
+     * @return port ID
+     */
+    public String id() {
+        return id;
+    }
+
+    /**
+     * Returns security group information.
+     *
+     * @return security group info
+     */
+    public List<String> securityGroups() {
+        return securityGroups;
+    }
+
+    /**
+     * Returns device ID.
+     *
+     * @return device ID
+     */
+    public String deviceId() {
+        return deviceId;
+    }
+
+    // TODO : Implement the following functions when necessary
+    //@Override
+    //public void equals(Object that) {
+    //
+    //}
+    //
+    //@Override
+    //public int hashCode() {
+    //
+    //}
+
+    /**
+     * OpenstackPort Builder class.
+     */
+    public static final class Builder {
+
+        private PortStatus status;
+        private String name;
+        // FIX_ME
+        private String allowedAddressPairs;
+        private boolean adminStateUp;
+        private String networkId;
+        private String tenantId;
+        private String deviceOwner;
+        private MacAddress macAddress;
+        // list  of hash map <subnet id, ip address>
+        private HashMap<String, Ip4Address> fixedIps;
+        private String id;
+        private List<String> securityGroups;
+        private String deviceId;
+
+        Builder() {
+            fixedIps = new HashMap<>();
+            securityGroups = Lists.newArrayList();
+        }
+
+        /**
+         * Sets port status.
+         *
+         * @param status port status
+         * @return Builder object
+         */
+        public Builder portStatus(PortStatus status) {
+            this.status = status;
+
+            return this;
+        }
+
+        /**
+         * Sets port name.
+         *
+         * @param name port name
+         * @return Builder object
+         */
+        public Builder name(String name) {
+            this.name = name;
+
+            return this;
+        }
+
+        /**
+         * Sets whether admin state up or not.
+         *
+         * @param isAdminStateUp true if admin state is up, false otherwise
+         * @return Builder object
+         */
+        public Builder adminState(boolean isAdminStateUp) {
+            this.adminStateUp = isAdminStateUp;
+
+            return this;
+        }
+
+        /**
+         * Sets network ID.
+         *
+         * @param networkId network ID
+         * @return Builder object
+         */
+        public Builder netwrokId(String networkId) {
+            this.networkId = networkId;
+
+            return this;
+        }
+
+        /**
+         * Sets tenant ID.
+         *
+         * @param tenantId tenant ID
+         * @return Builder object
+         */
+        public Builder tenantId(String tenantId) {
+            this.tenantId = tenantId;
+
+            return this;
+        }
+
+        /**
+         * Sets device owner.
+         *
+         * @param owner device owner
+         * @return Builder object
+         */
+        public Builder deviceOwner(String owner) {
+            this.deviceOwner = owner;
+
+            return this;
+        }
+
+        /**
+         * Sets MAC address of the port.
+         *
+         * @param mac MAC address
+         * @return Builder object
+         */
+        public Builder macAddress(MacAddress mac) {
+            this.macAddress = mac;
+
+            return this;
+        }
+
+        /**
+         * Sets Fixed IP address information.
+         *
+         * @param fixedIpList Fixed IP info
+         * @return Builder object
+         */
+        public Builder fixedIps(HashMap<String, Ip4Address> fixedIpList) {
+            fixedIps.putAll(fixedIpList);
+
+            return this;
+        }
+
+        /**
+         * Sets ID of the port.
+         *
+         * @param id ID of the port
+         * @return Builder object
+         */
+        public Builder id(String id) {
+            this.id = id;
+
+            return this;
+        }
+
+        /**
+         * Sets security group of the port.
+         *
+         * @param securityGroup security group of the port
+         * @return Builder object
+         */
+        public Builder securityGroup(String securityGroup) {
+            securityGroups.add(securityGroup);
+
+            return this;
+        }
+
+        /**
+         * Sets device ID of the port.
+         *
+         * @param deviceId device ID
+         * @return Builder object
+         */
+        public Builder deviceId(String deviceId) {
+            this.deviceId = deviceId;
+
+            return this;
+        }
+
+        /**
+         * Builds an OpenstackPort object.
+         *
+         * @return OpenstackPort objecet
+         */
+        public OpenstackPort build() {
+            return new OpenstackPort(status, name, adminStateUp, networkId, networkId,
+                    deviceOwner, macAddress, fixedIps, id, securityGroups, deviceId);
+        }
+    }
+}
+

+/*
+ * 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.openstackswitching;
+
+import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.apache.felix.scr.annotations.Service;
+import org.onlab.packet.Ethernet;
+import org.onlab.packet.IPv4;
+import org.onlab.packet.Ip4Address;
+import org.onlab.packet.Ip4Prefix;
+import org.onlab.packet.MacAddress;
+import org.onlab.packet.UDP;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.net.Device;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.Port;
+import org.onosproject.net.device.DeviceEvent;
+import org.onosproject.net.device.DeviceListener;
+import org.onosproject.net.device.DeviceService;
+import org.onosproject.net.flowobjective.FlowObjectiveService;
+import org.onosproject.net.packet.InboundPacket;
+import org.onosproject.net.packet.PacketContext;
+import org.onosproject.net.packet.PacketProcessor;
+import org.onosproject.net.packet.PacketService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+@SuppressWarnings("ALL")
+@Service
+@Component(immediate = true)
+/**
+ * It populates forwarding rules for VMs created by Openstack.
+ */
+public class OpenstackSwitchingManager implements OpenstackSwitchingService {
+
+    private static Logger log = LoggerFactory
+            .getLogger(OpenstackSwitchingManager.class);
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected CoreService coreService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected PacketService packetService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected DeviceService deviceService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected FlowObjectiveService flowObjectiveService;
+
+
+    public static final int DHCP_PORT = 67;
+
+    private ApplicationId appId;
+    private OpenstackArpHandler arpHandler;
+    private OpenstackDhcpHandler dhcpHandler = new OpenstackDhcpHandler();
+    private OpenstackSwitchingRulePopulator rulePopulator;
+    private ExecutorService deviceEventExcutorService = Executors.newFixedThreadPool(10);
+
+    private InternalPacketProcessor internalPacketProcessor = new InternalPacketProcessor();
+    private InternalDeviceListener internalDeviceListener = new InternalDeviceListener();
+
+    // Map <port_id, OpenstackPort>
+    private HashMap<String, OpenstackPort> openstackPortMap;
+    // Map <network_id, OpenstackNetwork>
+    private HashMap<String, OpenstackNetwork> openstackNetworkMap;
+    // Map <vni, List <Entry <portName, host ip>>
+    private HashMap<String, List<PortInfo>> vniPortMap;
+    private HashMap<Ip4Address, Port> tunnelPortMap;
+
+
+    @Activate
+    protected void activate() {
+        appId = coreService
+                .registerApplication("org.onosproject.openstackswitching");
+        rulePopulator = new OpenstackSwitchingRulePopulator(appId, flowObjectiveService);
+        packetService.addProcessor(internalPacketProcessor, PacketProcessor.director(1));
+        deviceService.addListener(internalDeviceListener);
+
+        openstackPortMap = Maps.newHashMap();
+        openstackNetworkMap = Maps.newHashMap();
+        vniPortMap = Maps.newHashMap();
+        tunnelPortMap = Maps.newHashMap();
+
+        arpHandler = new OpenstackArpHandler(openstackPortMap);
+
+        log.info("Started");
+    }
+
+    @Deactivate
+    protected void deactivate() {
+        packetService.removeProcessor(internalPacketProcessor);
+        deviceService.removeListener(internalDeviceListener);
+
+        deviceEventExcutorService.shutdown();
+
+        log.info("Stopped");
+    }
+
+    @Override
+    public void createPorts(OpenstackPort openstackPort) {
+        openstackPortMap.put(openstackPort.id(), openstackPort);
+    }
+
+    @Override
+    public void deletePorts() {
+
+    }
+
+    @Override
+    public void updatePorts() {
+
+    }
+
+    @Override
+    public void createNetwork(OpenstackNetwork openstackNetwork) {
+        openstackNetworkMap.put(openstackNetwork.id(), openstackNetwork);
+    }
+
+    private void processDeviceAdded(Device device) {
+        log.warn("device {} is added", device.id());
+        rulePopulator.populateDefaultRules(device.id());
+    }
+
+    private void processPortAdded(Device device, Port port) {
+        // TODO: Simplify the data structure to store the network info
+        // TODO: Make it stateless
+        // TODO: All the logics need to be processed inside of the rulePopulator class
+        synchronized (vniPortMap) {
+            log.warn("port {} is updated", port.toString());
+
+            updatePortMaps(device, port);
+            if (!port.annotations().value("portName").equals("vxlan")) {
+                populateFlowRulesForTrafficToSameCnode(device, port);
+                populateFlowRulesForTrafficToDifferentCnode(device, port);
+            }
+        }
+    }
+
+    private void processPortRemoved(Device device, Port port) {
+        log.warn("port {} is removed", port.toString());
+        // TODO: need to update the vniPortMap
+    }
+
+    /**
+     * Populates the flow rules for traffic to VMs in different Cnode using
+     * Nicira extention.
+     *
+     * @param device device to put rules
+     * @param port port information of the VM
+     */
+    private void populateFlowRulesForTrafficToDifferentCnode(Device device, Port port) {
+        String portName = port.annotations().value("portName");
+        String channelId = device.annotations().value("channelId");
+        Ip4Address hostIpAddress = Ip4Address.valueOf(channelId.split(":")[0]);
+        Ip4Address fixedIp = getFixedIpAddressForPort(portName);
+        // TODO: Avoid duplicate flow rule set up for VMs in other Cnode
+        //       (possibly avoided by flowrule subsystem?)
+        if (tunnelPortMap.get(hostIpAddress) == null) {
+            log.warn("There is no tunnel port information");
+            return;
+        }
+        String vni = getVniForPort(portName);
+        MacAddress vmMac = getVmMacAddressForPort(portName);
+        if (!vniPortMap.isEmpty() && vniPortMap.get(vni) != null) {
+            for (PortInfo portInfo : vniPortMap.get(vni)) {
+                if (!portInfo.portName.equals(portName) &&
+                        !portInfo.hostIp.equals(hostIpAddress)) {
+                    MacAddress vmMacx = getVmMacAddressForPort(portInfo.portName);
+                    rulePopulator.populateForwardingRuleForOtherCnode(vni,
+                            device.id(), portInfo.hostIp, portInfo.fixedIp, vmMacx,
+                            tunnelPortMap.get(hostIpAddress).number(),
+                            portInfo.deviceId, hostIpAddress, fixedIp, vmMac,
+                            tunnelPortMap.get(portInfo.hostIp).number());
+                }
+            }
+        }
+    }
+
+    /**
+     * Populates the flow rules for traffic to VMs in the same Cnode as the sender.
+     *
+     * @param device device to put the rules
+     * @param port port info of the VM
+     */
+    private void populateFlowRulesForTrafficToSameCnode(Device device, Port port) {
+        Ip4Prefix cidr = getCidrForPort(port.annotations().value("portName"));
+        Ip4Address vmIp = getFixedIpAddressForPort(port.annotations().value("portName"));
+        if (vmIp != null) {
+            rulePopulator.populateForwardingRule(vmIp, device.id(), port, cidr);
+        }
+    }
+
+    /**
+     * Updates the port maps using the port information.
+     *
+     * @param device device info
+     * @param port port of the VM
+     */
+    private void updatePortMaps(Device device, Port port) {
+        String portName = port.annotations().value("portName");
+        String channelId = device.annotations().value("channelId");
+        Ip4Address hostIpAddress = Ip4Address.valueOf(channelId.split(":")[0]);
+        if (portName.startsWith("vxlan")) {
+            tunnelPortMap.put(hostIpAddress, port);
+        } else {
+            String vni = getVniForPort(portName);
+            Ip4Address fixedIp = getFixedIpAddressForPort(portName);
+            if (vniPortMap.get(vni) == null) {
+                vniPortMap.put(vni, Lists.newArrayList());
+            }
+            vniPortMap.get(vni).add(new PortInfo(device.id(), portName, fixedIp, hostIpAddress));
+        }
+    }
+
+    /**
+     * Returns CIDR information from the subnet map for the port.
+     *
+     * @param portName port name of the port of the VM
+     * @return CIDR of the VNI of the VM
+     */
+    private Ip4Prefix getCidrForPort(String portName) {
+        String networkId = null;
+        String uuid = portName.substring(3);
+        OpenstackPort port = openstackPortMap.values().stream()
+                .filter(p -> p.id().startsWith(uuid))
+                .findFirst().get();
+        if (port == null) {
+            log.warn("No port information for port {}", portName);
+            return null;
+        }
+
+        //OpenstackSubnet subnet = openstackSubnetMap.values().stream()
+        //        .filter(s -> s.networkId().equals(port.networkId()))
+        //        .findFirst().get();
+        //if (subnet == null) {
+        //    log.warn("No subnet information for network {}", subnet.id());
+        //    return null;
+        //}
+
+        //return Ip4Prefix.valueOf(subnet.cidr());
+        return null;
+    }
+
+    /**
+     * Returns the VNI of the VM of the port.
+     *
+     * @param portName VM port
+     * @return VNI
+     */
+    private String getVniForPort(String portName) {
+        String networkId = null;
+        String uuid = portName.substring(3);
+        OpenstackPort port = openstackPortMap.values().stream()
+                .filter(p -> p.id().startsWith(uuid))
+                .findFirst().get();
+        if (port == null) {
+            log.warn("No port information for port {}", portName);
+            return null;
+        }
+        OpenstackNetwork network = openstackNetworkMap.values().stream()
+                .filter(n -> n.id().equals(port.networkId()))
+                .findFirst().get();
+        if (network == null) {
+            log.warn("No VNI information for network {}", network.id());
+            return null;
+        }
+
+        return network.segmentId();
+    }
+
+    /**
+     * Returns the Fixed IP address of the VM.
+     *
+     * @param portName VM port info
+     * @return IP address of the VM
+     */
+    private Ip4Address getFixedIpAddressForPort(String portName) {
+
+        // FIXME - For now we use the information stored from neutron Rest API call.
+        // TODO - Later, the information needs to be extracted from Neutron on-demand.
+        String uuid = portName.substring(3);
+        OpenstackPort port = openstackPortMap.values().stream()
+                        .filter(p -> p.id().startsWith(uuid))
+                        .findFirst().get();
+
+        if (port == null) {
+            log.error("There is no port information for port name {}", portName);
+            return null;
+        }
+
+        if (port.fixedIps().isEmpty()) {
+            log.error("There is no fixed IP info in the port information");
+            return null;
+        }
+
+        return (Ip4Address) port.fixedIps().values().toArray()[0];
+    }
+
+    /**
+     * Returns the MAC address of the VM of the port.
+     *
+     * @param portName VM port
+     * @return MAC address of the VM
+     */
+    private MacAddress getVmMacAddressForPort(String portName) {
+
+        String uuid = portName.substring(3);
+        OpenstackPort port = openstackPortMap.values().stream()
+                .filter(p -> p.id().startsWith(uuid))
+                .findFirst().get();
+
+        if (port == null) {
+            log.error("There is no mac information for port name {}", portName);
+            return null;
+        }
+
+        return port.macAddress();
+    }
+
+    private class InternalPacketProcessor implements PacketProcessor {
+
+        @Override
+        public void process(PacketContext context) {
+
+            if (context.isHandled()) {
+                return;
+            }
+
+            InboundPacket pkt = context.inPacket();
+            Ethernet ethernet = pkt.parsed();
+
+            if (ethernet.getEtherType() == Ethernet.TYPE_ARP) {
+                arpHandler.processPacketIn(pkt);
+            } else if (ethernet.getEtherType() == Ethernet.TYPE_IPV4) {
+                IPv4 ipPacket = (IPv4) ethernet.getPayload();
+
+                if (ipPacket.getProtocol() == IPv4.PROTOCOL_UDP) {
+                    UDP udpPacket = (UDP) ipPacket.getPayload();
+                    if (udpPacket.getDestinationPort() == DHCP_PORT) {
+                        dhcpHandler.processPacketIn(pkt);
+                    }
+                }
+            }
+        }
+    }
+
+    private class InternalDeviceListener implements DeviceListener {
+
+        @Override
+        public void event(DeviceEvent event) {
+            deviceEventExcutorService.execute(new InternalEventHandler(event));
+        }
+    }
+
+    private class InternalEventHandler implements Runnable {
+
+        volatile DeviceEvent deviceEvent;
+
+        InternalEventHandler(DeviceEvent deviceEvent) {
+            this.deviceEvent = deviceEvent;
+        }
+
+        @Override
+        public void run() {
+            switch (deviceEvent.type()) {
+                case DEVICE_ADDED:
+                    processDeviceAdded((Device) deviceEvent.subject());
+                    break;
+                case DEVICE_UPDATED:
+                    Port port = (Port) deviceEvent.subject();
+                    if (port.isEnabled()) {
+                        processPortAdded((Device) deviceEvent.subject(), deviceEvent.port());
+                    }
+                    break;
+                case DEVICE_AVAILABILITY_CHANGED:
+                    Device device = (Device) deviceEvent.subject();
+                    if (deviceService.isAvailable(device.id())) {
+                        processDeviceAdded(device);
+                    }
+                    break;
+                case PORT_ADDED:
+                    processPortAdded((Device) deviceEvent.subject(), deviceEvent.port());
+                    break;
+                case PORT_UPDATED:
+                    processPortAdded((Device) deviceEvent.subject(), deviceEvent.port());
+                    break;
+                case PORT_REMOVED:
+                    processPortRemoved((Device) deviceEvent.subject(), deviceEvent.port());
+                    break;
+                default:
+                    break;
+            }
+        }
+    }
+
+    private final class PortInfo {
+        DeviceId deviceId;
+        String portName;
+        Ip4Address fixedIp;
+        Ip4Address hostIp;
+
+        private PortInfo(DeviceId deviceId, String portName, Ip4Address fixedIp,
+                         Ip4Address hostIp) {
+            this.deviceId = deviceId;
+            this.portName = portName;
+            this.fixedIp = fixedIp;
+            this.hostIp = hostIp;
+        }
+    }
+
+}
\ No newline at end of file

+/*
+* 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.openstackswitching;
+
+import org.onlab.packet.Ethernet;
+import org.onlab.packet.IPv4;
+import org.onlab.packet.Ip4Address;
+import org.onlab.packet.Ip4Prefix;
+import org.onlab.packet.MacAddress;
+import org.onlab.packet.TpPort;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.Port;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.flow.DefaultTrafficSelector;
+import org.onosproject.net.flow.DefaultTrafficTreatment;
+import org.onosproject.net.flow.TrafficSelector;
+import org.onosproject.net.flow.TrafficTreatment;
+import org.onosproject.net.flowobjective.DefaultForwardingObjective;
+import org.onosproject.net.flowobjective.FlowObjectiveService;
+import org.onosproject.net.flowobjective.ForwardingObjective;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * It populates switching flow rules.
+ *
+ */
+public class OpenstackSwitchingRulePopulator {
+
+    private static Logger log = LoggerFactory
+            .getLogger(OpenstackSwitchingRulePopulator.class);
+
+    private FlowObjectiveService flowObjectiveService;
+    private ApplicationId appId;
+
+    /**
+     * Returns OpenstackSwitchingRule reference.
+     * @param flowObjectiveService FlowObjectiveService reference
+     */
+    public OpenstackSwitchingRulePopulator(ApplicationId appId,
+                                           FlowObjectiveService flowObjectiveService) {
+        this.flowObjectiveService = flowObjectiveService;
+        this.appId = appId;
+    }
+
+    /**
+     * Populates flows rules for forwarding packets to and from VMs.
+     *
+     * @return true if it succeeds to populate rules, false otherwise.
+     */
+    public boolean populateForwardingRule(Ip4Address ip, DeviceId id, Port port, Ip4Prefix cidr) {
+
+
+        setFlowRuleForVMsInSameCnode(ip, id, port, cidr);
+
+        return true;
+    }
+
+    /**
+     * Populates the common flows rules for all VMs.
+     *
+     * - Send ARP packets to the controller
+     * - Send DHCP packets to the controller
+     *
+     * @param id Device ID to populates rules to
+     */
+    public void populateDefaultRules(DeviceId id) {
+
+        //setFlowRuleForDHCP(id);
+        setFlowRuleForArp(id);
+
+        log.warn("Default rule has been set");
+    }
+
+    /**
+     * Populates the forwarding rules for VMs with the same VNI but in other Code.
+     *
+     * @param vni VNI for the networks
+     * @param id device ID to populates the flow rules
+     * @param hostIp host IP address of the VM
+     * @param vmIp fixed IP address for the VM
+     * @param idx device ID for OVS of the other VM
+     * @param hostIpx host IP address of the other VM
+     * @param vmIpx fixed IP address of the other VM
+     */
+    public void populateForwardingRuleForOtherCnode(String vni, DeviceId id, Ip4Address hostIp,
+                                                    Ip4Address vmIp, MacAddress vmMac, PortNumber tunnelPort,
+                                                    DeviceId idx, Ip4Address hostIpx,
+                                                    Ip4Address vmIpx, MacAddress vmMacx, PortNumber tunnelPortx) {
+        setVxLanFlowRule(vni, id, hostIp, vmIp, vmMac, tunnelPort);
+        setVxLanFlowRule(vni, idx, hostIpx, vmIpx, vmMacx, tunnelPortx);
+    }
+
+    /**
+     * Populates the flow rules for DHCP packets from VMs.
+     *
+     * @param id device ID to set the rules
+     */
+    private void setFlowRuleForDHCP(DeviceId id) {
+        TrafficSelector.Builder sBuilder = DefaultTrafficSelector.builder();
+        TrafficTreatment.Builder tBuilder = DefaultTrafficTreatment.builder();
+
+        sBuilder.matchEthType(Ethernet.TYPE_IPV4)
+                .matchIPProtocol(IPv4.PROTOCOL_UDP)
+                .matchUdpDst(TpPort.tpPort(OpenstackSwitchingManager.DHCP_PORT));
+        tBuilder.setOutput(PortNumber.CONTROLLER);
+
+        ForwardingObjective fo = DefaultForwardingObjective.builder()
+                .withSelector(sBuilder.build())
+                .withTreatment(tBuilder.build())
+                .withPriority(5000)
+                .withFlag(ForwardingObjective.Flag.VERSATILE)
+                .fromApp(appId)
+                .add();
+
+        flowObjectiveService.forward(id, fo);
+    }
+
+    /**
+     * Populates the flow rules for ARP packets from VMs.
+     *
+     * @param id device ID to put rules.
+     */
+    private void setFlowRuleForArp(DeviceId id) {
+        TrafficSelector.Builder sBuilder = DefaultTrafficSelector.builder();
+        TrafficTreatment.Builder tBuilder = DefaultTrafficTreatment.builder();
+
+        sBuilder.matchEthType(Ethernet.TYPE_ARP);
+        tBuilder.setOutput(PortNumber.CONTROLLER);
+
+        ForwardingObjective fo = DefaultForwardingObjective.builder()
+                .withSelector(sBuilder.build())
+                .withTreatment(tBuilder.build())
+                .withPriority(5000)
+                .withFlag(ForwardingObjective.Flag.VERSATILE)
+                .fromApp(appId)
+                .add();
+
+        flowObjectiveService.forward(id, fo);
+    }
+
+    /**
+     * Sets the flow rules for traffic between VMs in the same Cnode.
+     *
+     * @param ip4Address VM IP address
+     * @param id device ID to put rules
+     * @param port VM port
+     * @param cidr subnet info of the VMs
+     */
+    private void setFlowRuleForVMsInSameCnode(Ip4Address ip4Address, DeviceId id,
+                                              Port port, Ip4Prefix cidr) {
+        TrafficSelector.Builder sBuilder = DefaultTrafficSelector.builder();
+        TrafficTreatment.Builder tBuilder = DefaultTrafficTreatment.builder();
+
+        sBuilder.matchEthType(Ethernet.TYPE_IPV4)
+                .matchIPDst(ip4Address.toIpPrefix())
+                .matchIPSrc(cidr);
+        tBuilder.setOutput(port.number());
+
+        ForwardingObjective fo = DefaultForwardingObjective.builder()
+                .withSelector(sBuilder.build())
+                .withTreatment(tBuilder.build())
+                .withPriority(5000)
+                .withFlag(ForwardingObjective.Flag.VERSATILE)
+                .fromApp(appId)
+                .add();
+
+        flowObjectiveService.forward(id, fo);
+    }
+
+    /**
+     * Sets the flow rules between traffic from VMs in different Cnode.
+     *
+     * @param vni  VNI
+     * @param id device ID
+     * @param hostIp host IP of the VM
+     * @param vmIp fixed IP of the VM
+     * @param vmMac MAC address of the VM
+     * @param tunnelPort tunnel port to forward traffic to
+     */
+    private void setVxLanFlowRule(String vni, DeviceId id, Ip4Address hostIp,
+                                  Ip4Address vmIp, MacAddress vmMac, PortNumber tunnelPort) {
+        TrafficSelector.Builder sBuilder = DefaultTrafficSelector.builder();
+        TrafficTreatment.Builder tBuilder = DefaultTrafficTreatment.builder();
+
+        sBuilder.matchEthType(Ethernet.TYPE_IPV4)
+                .matchIPDst(vmIp.toIpPrefix());
+        tBuilder.setTunnelId(Long.parseLong(vni))
+                //.setTunnelDst() <- for Nicira ext
+                //.setEthDst(vmMac)
+                .setOutput(tunnelPort);
+
+        ForwardingObjective fo = DefaultForwardingObjective.builder()
+                .withSelector(sBuilder.build())
+                .withTreatment(tBuilder.build())
+                .withPriority(5000)
+                .withFlag(ForwardingObjective.Flag.VERSATILE)
+                .fromApp(appId)
+                .add();
+
+        flowObjectiveService.forward(id, fo);
+    }
+}

+/*
+ * 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.openstackswitching;
+
+/**
+ * It handles port management REST API from Openstack for VMs.
+ */
+public interface OpenstackSwitchingService {
+
+    /**
+     * Store the port information created by Openstack.
+     *
+     * @param openstackPort port information
+     */
+    void createPorts(OpenstackPort openstackPort);
+
+    /**
+     * Removes flow rules corresponding to the port removed by Openstack.
+     *
+     */
+    void deletePorts();
+
+    /**
+     * Updates flow rules corresponding to the port information updated by Openstack.
+     *
+     */
+    void updatePorts();
+
+    /**
+     * Store the network information created by openstack.
+     *
+     * @param openstackNetwork network information
+     */
+    void createNetwork(OpenstackNetwork openstackNetwork);
+
+}

+/*
+ * 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.openstackswitching.web;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.openstackswitching.OpenstackNetwork;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Implementation of the OpenstackNetwork Codec.
+ *
+ */
+public class OpenstackNetworkCodec extends JsonCodec<OpenstackNetwork> {
+
+    protected static final Logger log = LoggerFactory
+            .getLogger(OpenstackNetworkCodec.class);
+
+    private static final String NETWORK = "network";
+    private static final String NAME = "name";
+    private static final String TENANT_ID = "tenant_id";
+    private static final String SEGMENTATION_ID = "provider:segmentation_id";
+    private static final String NETWORK_TYPE = "provider:network_type";
+    private static final String ID = "id";
+
+    @Override
+    public OpenstackNetwork decode(ObjectNode json, CodecContext context) {
+
+        JsonNode networkInfo = json.get(NETWORK);
+
+        String name = networkInfo.path(NAME).asText();
+        String tenantId = networkInfo.path(TENANT_ID).asText();
+        String id = networkInfo.path(ID).asText();
+
+        OpenstackNetwork.Builder onb = OpenstackNetwork.builder();
+        onb.name(name)
+                .tenantId(tenantId)
+                .id(id);
+
+        if (!networkInfo.path(NETWORK_TYPE).isMissingNode()) {
+            onb.name(networkInfo.path(NETWORK_TYPE).asText());
+            onb.segmentId(networkInfo.path(SEGMENTATION_ID).asText());
+        }
+
+        return onb.build();
+    }
+
+}

+/*
+ * 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.openstackswitching.web;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onosproject.openstackswitching.OpenstackNetwork;
+import org.onosproject.openstackswitching.OpenstackSwitchingService;
+import org.onosproject.rest.AbstractWebResource;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.ws.rs.Consumes;
+import javax.ws.rs.POST;
+import javax.ws.rs.Path;
+import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import java.io.InputStream;
+
+@Path("networks")
+public class OpenstackNetworkWebResource extends AbstractWebResource {
+
+    protected static final Logger log = LoggerFactory
+            .getLogger(OpenstackNetworkWebResource.class);
+
+    private static final OpenstackNetworkCodec NETWORK_CODEC = new OpenstackNetworkCodec();
+
+    @POST
+    @Consumes(MediaType.APPLICATION_JSON)
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response createNetwork(InputStream input) {
+        try {
+            ObjectMapper mapper = new ObjectMapper();
+            ObjectNode networkNode = (ObjectNode) mapper.readTree(input);
+
+            OpenstackNetwork openstackNetwork = NETWORK_CODEC.decode(networkNode, this);
+
+            OpenstackSwitchingService switchingService = get(OpenstackSwitchingService.class);
+            switchingService.createNetwork(openstackNetwork);
+            return Response.status(Response.Status.OK).build();
+        } catch (Exception e) {
+            log.error("Creates VirtualPort failed because of exception {}",
+                    e.toString());
+            return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(e.toString())
+                    .build();
+        }
+    }
+}

+/*
+ * 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.openstackswitching.web;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onlab.packet.Ip4Address;
+import org.onlab.packet.MacAddress;
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.openstackswitching.OpenstackPort;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+
+/**
+ * It encodes and decodes the OpenstackPort.
+ */
+public class OpenstackPortCodec extends JsonCodec<OpenstackPort> {
+
+    private static Logger log = LoggerFactory
+            .getLogger(OpenstackPortCodec.class);
+
+    // JSON field names
+    private static final String PORT = "port";
+    private static final String STATUS = "status";
+    private static final String NAME = "name";
+    private static final String ADDRESS_PAIR = "allowed_address_pairs";
+    private static final String ADMIN_STATUS = "admin_status";
+    private static final String NETWORK_ID = "network_id";
+    private static final String TENANT_ID = "tenant_id";
+    private static final String DEVICE_OWNER = "device_owner";
+    private static final String MAC_ADDRESS = "mac_address";
+    private static final String FIXED_IPS = "fixed_ips";
+    private static final String SUBNET_ID = "subnet_id";
+    private static final String IP_ADDRESS = "ip_address";
+    private static final String ID = "id";
+    private static final String SECURITY_GROUPS = "security_groups";
+    private static final String DEVICE_ID = "device_id";
+
+    @Override
+    public OpenstackPort decode(ObjectNode json, CodecContext context) {
+
+        HashMap<String, Ip4Address> fixedIpMap = new HashMap<>();
+        JsonNode portInfo = json.get(PORT);
+
+        String status = portInfo.path(STATUS).asText();
+        String name = portInfo.path(NAME).asText();
+        boolean adminStateUp = portInfo.path(ADMIN_STATUS).asBoolean();
+        String networkId = portInfo.path(NETWORK_ID).asText();
+        String tenantId = portInfo.path(TENANT_ID).asText();
+        String deviceOwner = portInfo.path(DEVICE_OWNER).asText();
+        String macStr = portInfo.path(MAC_ADDRESS).asText();
+        ArrayNode fixedIpList = (ArrayNode) portInfo.path(FIXED_IPS);
+        for (JsonNode fixedIpInfo: fixedIpList) {
+            String subnetId = fixedIpInfo.path(SUBNET_ID).asText();
+            String ipAddressStr = fixedIpInfo.path(IP_ADDRESS).asText();
+            if (ipAddressStr != null) {
+                Ip4Address ipAddress = Ip4Address.valueOf(ipAddressStr);
+                fixedIpMap.put(subnetId, ipAddress);
+            }
+        }
+        String id = portInfo.path(ID).asText();
+        String securityGroups = portInfo.path(SECURITY_GROUPS).asText();
+        String deviceId = portInfo.path(DEVICE_ID).asText();
+
+        OpenstackPort.Builder openstackPortBuilder = OpenstackPort.builder();
+        openstackPortBuilder.portStatus(OpenstackPort.PortStatus.valueOf(status))
+                .name(name)
+                .adminState(adminStateUp)
+                .netwrokId(networkId)
+                .tenantId(tenantId)
+                .deviceOwner(deviceOwner)
+                .macAddress(MacAddress.valueOf(macStr))
+                .fixedIps(fixedIpMap)
+                .id(id)
+                .deviceId(deviceId);
+
+        // FIX ME
+        if (!securityGroups.isEmpty()) {
+            openstackPortBuilder.securityGroup(securityGroups);
+        }
+
+        OpenstackPort openstackPort = openstackPortBuilder.build();
+
+        return openstackPort;
+    }
+
+}

+/*
+ * 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.openstackswitching.web;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onosproject.openstackswitching.OpenstackPort;
+import org.onosproject.openstackswitching.OpenstackSwitchingService;
+import org.onosproject.rest.AbstractWebResource;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.ws.rs.Consumes;
+import javax.ws.rs.DELETE;
+import javax.ws.rs.POST;
+import javax.ws.rs.PUT;
+import javax.ws.rs.Path;
+import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import java.io.InputStream;
+
+@Path("ports")
+public class OpenstackPortWebResource extends AbstractWebResource {
+
+    protected static final Logger log = LoggerFactory
+            .getLogger(OpenstackPortWebResource.class);
+
+    private static final OpenstackPortCodec PORT_CODEC = new OpenstackPortCodec();
+
+    @POST
+    @Consumes(MediaType.APPLICATION_JSON)
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response createPorts(InputStream input) {
+        try {
+            ObjectMapper mapper = new ObjectMapper();
+            ObjectNode portNode = (ObjectNode) mapper.readTree(input);
+
+            OpenstackPort openstackPort = PORT_CODEC.decode(portNode, this);
+
+            OpenstackSwitchingService switchingService = get(OpenstackSwitchingService.class);
+            switchingService.createPorts(openstackPort);
+            log.info("REST API ports is called with {}", portNode.toString());
+            return Response.status(Response.Status.OK).build();
+        } catch (Exception e) {
+            log.error("Creates VirtualPort failed because of exception {}",
+                    e.toString());
+            return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(e.toString())
+                    .build();
+        }
+    }
+
+    @DELETE
+    @Consumes(MediaType.APPLICATION_JSON)
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response deletesPorts(InputStream input) {
+        try {
+            ObjectMapper mapper = new ObjectMapper();
+            ObjectNode portNode = (ObjectNode) mapper.readTree(input);
+
+            OpenstackSwitchingService switchingService = get(OpenstackSwitchingService.class);
+            switchingService.deletePorts();
+            log.info("REST API ports is called with {}", portNode.toString());
+            return Response.status(Response.Status.OK).build();
+        } catch (Exception e) {
+            log.error("Delete VirtualPort failed because of exception {}",
+                    e.toString());
+            return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(e.toString())
+                    .build();
+        }
+    }
+
+    @PUT
+    @Path("{id}")
+    @Consumes(MediaType.APPLICATION_JSON)
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response updatePorts(InputStream input) {
+        try {
+            ObjectMapper mapper = new ObjectMapper();
+            ObjectNode portNode = (ObjectNode) mapper.readTree(input);
+
+            OpenstackSwitchingService switchingService = get(OpenstackSwitchingService.class);
+            switchingService.updatePorts();
+            log.info("REST API ports is called with {}", portNode.toString());
+            return Response.status(Response.Status.OK).build();
+        } catch (Exception e) {
+            log.error("Update VirtualPort failed because of exception {}",
+                    e.toString());
+            return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(e.toString())
+                    .build();
+        }
+    }
+}

+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ 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.
+  -->
+<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee"
+         xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
+         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
+         id="ONOS" version="2.5">
+    <display-name>Openstack Switching REST API v1.0</display-name>
+
+    <servlet>
+        <servlet-name>JAX-RS Service</servlet-name>
+        <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
+        <init-param>
+            <param-name>com.sun.jersey.config.property.resourceConfigClass</param-name>
+            <param-value>com.sun.jersey.api.core.ClassNamesResourceConfig</param-value>
+        </init-param>
+        <init-param>
+            <param-name>com.sun.jersey.config.property.classnames</param-name>
+            <param-value>
+                org.onosproject.openstackswitching.web.OpenstackPortWebResource,
+                org.onosproject.openstackswitching.web.OpenstackNetworkWebResource
+            </param-value>
+        </init-param>
+        <load-on-startup>1</load-on-startup>
+    </servlet>
+
+    <servlet-mapping>
+        <servlet-name>JAX-RS Service</servlet-name>
+        <url-pattern>/*</url-pattern>
+    </servlet-mapping>
+</web-app>

@@ -13,10 +13,7 @@
   ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   ~ See the License for the specific language governing permissions and
   ~ See the License for the specific language governing permissions and
   ~ limitations under the License.
   ~ 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/maven-v4_0_0.xsd">
+  --><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/maven-v4_0_0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <modelVersion>4.0.0</modelVersion>
 
 
     <parent>
     <parent>
@@ -60,6 +57,7 @@
         <module>igmp</module>
         <module>igmp</module>
         <module>pim</module>
         <module>pim</module>
         <module>mlb</module>
         <module>mlb</module>
+        <module>openstackswitching</module>
   </modules>
   </modules>
 
 
     <properties>
     <properties>