Ejemplo n.º 1
0
  /**
   * 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;
    byte[] senderIpAddress;

    try {
      senderMacAddress = config.getDeviceMac(deviceId).toBytes();
      senderIpAddress = config.getRouterIp(deviceId).toOctets();
    } catch (DeviceConfigNotFoundException e) {
      log.warn(e.getMessage() + " Aborting sendArpRequest.");
      return;
    }

    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);

    removeVlanAndFlood(eth, inPort);
  }
Ejemplo n.º 2
0
 private boolean isArpForRouter(DeviceId deviceId, ARP arpMsg) {
   Ip4Address targetProtocolAddress = Ip4Address.valueOf(arpMsg.getTargetProtocolAddress());
   Set<Ip4Address> gatewayIpAddresses = null;
   try {
     if (targetProtocolAddress.equals(config.getRouterIp(deviceId))) {
       return true;
     }
     gatewayIpAddresses = config.getPortIPs(deviceId);
   } catch (DeviceConfigNotFoundException e) {
     log.warn(e.getMessage() + " Aborting check for router IP in processing arp");
   }
   if (gatewayIpAddresses != null && gatewayIpAddresses.contains(targetProtocolAddress)) {
     return true;
   }
   return false;
 }
Ejemplo n.º 3
0
  /**
   * 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 inbound 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());
    Set<Ip4Address> gatewayIpAddresses = config.getPortIPs(deviceId);
    Ip4Address routerIp;
    try {
      routerIp = config.getRouterIp(deviceId);
    } catch (DeviceConfigNotFoundException e) {
      log.warn(e.getMessage() + " Aborting processPacketIn.");
      return;
    }
    IpPrefix routerIpPrefix = IpPrefix.valueOf(routerIp, IpPrefix.MAX_INET_MASK_LENGTH);
    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)
            || gatewayIpAddresses.contains(destinationAddress))) {
      sendICMPResponse(ethernet, connectPoint);

      // ICMP for any known host
    } else if (!srManager.hostService.getHostsByIp(destinationAddress).isEmpty()) {
      // TODO: known host packet should not be coming to controller - resend flows?
      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
    }
  }