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.IetfInetUtil;
  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.basepacket.rev140528.packet.chain.grp.packet.chain.packet.raw.packet.RawPacketFields;
  14 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.ethernet.rev140528.ethernet.packet.received.packet.chain.packet.EthernetPacket;
  15 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.ipv4.rev140528.Ipv4PacketListener;
  16 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.ipv4.rev140528.Ipv4PacketReceived;
  17 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.ipv4.rev140528.ipv4.packet.received.packet.chain.packet.Ipv4Packet;
  18
  19
  20 /**
  21  * AddressObserver listens to IPv4 packets to find addresses (mac, ip) and store
  22  * these address observations for each node-connector. These packets are
  23  * returned to the network after the addresses are learned.
  24  */
  25 public class AddressObserverUsingIpv4 implements Ipv4PacketListener {
  26     private static final String IPV4_IP_TO_IGNORE = "0.0.0.0";
  27
  28     private final AddressObservationWriter addressObservationWriter;
  29
  30     public AddressObserverUsingIpv4(AddressObservationWriter addressObservationWriter) {
  31         this.addressObservationWriter = addressObservationWriter;
  32     }
  33
  34     /**
  35      * The handler function for IPv4 packets.
  36      *
  37      * @param packetReceived
  38      *            The incoming packet.
  39      */
  40     @Override
  41     public void onIpv4PacketReceived(Ipv4PacketReceived packetReceived) {
  42         if (packetReceived == null || packetReceived.getPacketChain() == null) {
  43             return;
  44         }
  45
  46         RawPacketFields rawPacket = null;
  47         EthernetPacket ethernetPacket = null;
  48         Ipv4Packet ipv4Packet = null;
  49         for (PacketChain packetChain : packetReceived.getPacketChain()) {
  50             if (packetChain.getPacket() instanceof RawPacket) {
  51                 rawPacket = ((RawPacket) packetChain.getPacket()).getRawPacketFields();
  52             } else if (packetChain.getPacket() instanceof EthernetPacket) {
  53                 ethernetPacket = (EthernetPacket) packetChain.getPacket();
  54             } else if (packetChain.getPacket() instanceof Ipv4Packet) {
  55                 ipv4Packet = (Ipv4Packet) packetChain.getPacket();
  56             }
  57         }
  58         if (rawPacket == null || ethernetPacket == null || ipv4Packet == null) {
  59             return;
  60         }
  61
  62         if (!IPV4_IP_TO_IGNORE.equals(ipv4Packet.getSourceIpv4().getValue())) {
  63             addressObservationWriter.addAddress(ethernetPacket.getSourceMac(),
  64                 IetfInetUtil.ipAddressFor(ipv4Packet.getSourceIpv4().getValue()), rawPacket.getIngress());
  65         }
  66     }
  67 }