addresstracker/implementation/src/main/java/org/opendaylight/l2switch/addresstracker/addressobserver/AddressObserverUsingIpv4.java

   1 /*
   2  * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.l2switch.addresstracker.addressobserver;
   9
  10 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddressBuilder;
  11 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.basepacket.rev140528.packet.chain.grp.PacketChain;
  12 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.basepacket.rev140528.packet.chain.grp.packet.chain.packet.RawPacket;
  13 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.ethernet.rev140528.ethernet.packet.received.packet.chain.packet.EthernetPacket;
  14 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.ipv4.rev140528.Ipv4PacketListener;
  15 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.ipv4.rev140528.Ipv4PacketReceived;
  16 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.ipv4.rev140528.ipv4.packet.received.packet.chain.packet.Ipv4Packet;
  17
  18
  19 /**
  20  * AddressObserver listens to IPv4 packets to find addresses (mac, ip) and store
  21  * these address observations for each node-connector. These packets are
  22  * returned to the network after the addresses are learned.
  23  */
  24 public class AddressObserverUsingIpv4 implements Ipv4PacketListener {
  25     private static final String IPV4_IP_TO_IGNORE = "0.0.0.0";
  26
  27     private final AddressObservationWriter addressObservationWriter;
  28
  29     public AddressObserverUsingIpv4(AddressObservationWriter addressObservationWriter) {
  30         this.addressObservationWriter = addressObservationWriter;
  31     }
  32
  33     /**
  34      * The handler function for IPv4 packets.
  35      *
  36      * @param packetReceived
  37      *            The incoming packet.
  38      */
  39     @Override
  40     public void onIpv4PacketReceived(Ipv4PacketReceived packetReceived) {
  41         if (packetReceived == null || packetReceived.getPacketChain() == null) {
  42             return;
  43         }
  44
  45         RawPacket rawPacket = null;
  46         EthernetPacket ethernetPacket = null;
  47         Ipv4Packet ipv4Packet = null;
  48         for (PacketChain packetChain : packetReceived.getPacketChain()) {
  49             if (packetChain.getPacket() instanceof RawPacket) {
  50                 rawPacket = (RawPacket) packetChain.getPacket();
  51             } else if (packetChain.getPacket() instanceof EthernetPacket) {
  52                 ethernetPacket = (EthernetPacket) packetChain.getPacket();
  53             } else if (packetChain.getPacket() instanceof Ipv4Packet) {
  54                 ipv4Packet = (Ipv4Packet) packetChain.getPacket();
  55             }
  56         }
  57         if (rawPacket == null || ethernetPacket == null || ipv4Packet == null) {
  58             return;
  59         }
  60
  61         if (!IPV4_IP_TO_IGNORE.equals(ipv4Packet.getSourceIpv4().getValue())) {
  62             addressObservationWriter.addAddress(ethernetPacket.getSourceMac(),
  63                     IpAddressBuilder.getDefaultInstance(ipv4Packet.getSourceIpv4().getValue()), rawPacket.getIngress());
  64         }
  65     }
  66 }