Exemplo n.º 1
0
 /** @see java.net.DatagramSocketImpl#receive(java.net.DatagramPacket) */
 protected void onReceive(DatagramPacket p, SocketBuffer skbuf) throws IOException {
   final IPv4Header ipHdr = (IPv4Header) skbuf.getNetworkLayerHeader();
   final UDPHeader udpHdr = (UDPHeader) skbuf.getTransportLayerHeader();
   p.setData(skbuf.toByteArray(), 0, skbuf.getSize());
   p.setAddress(ipHdr.getSource().toInetAddress());
   p.setPort(udpHdr.getSrcPort());
 }
Exemplo n.º 2
0
 /**
  * Process a segment whose destination port is unreachable
  *
  * @param hdr
  */
 private void processPortUnreachable(IPv4Header ipHdr, TCPHeader hdr) throws SocketException {
   final TCPHeader replyHdr =
       new TCPHeader(hdr.getDstPort(), hdr.getSrcPort(), 0, 0, hdr.getSequenceNr() + 1, 0, 0);
   replyHdr.setFlags(TCPF_ACK | TCPF_RST);
   final IPv4Header replyIpHdr = new IPv4Header(ipHdr);
   replyIpHdr.swapAddresses();
   send(replyIpHdr, replyHdr, new SocketBuffer());
 }
Exemplo n.º 3
0
 /**
  * Deliver a packet to the corresponding protocol
  *
  * @param hdr
  * @param skbuf
  */
 private void deliver(IPv4Header hdr, SocketBuffer skbuf) throws SocketException {
   final IPv4Protocol protocol;
   try {
     protocol = getProtocol(hdr.getProtocol());
     protocol.receive(skbuf);
   } catch (NoSuchProtocolException ex) {
     log.debug(
         "Found unknown IP src="
             + hdr.getSource()
             + ", dst="
             + hdr.getDestination()
             + ", prot=0x"
             + NumberUtils.hex(hdr.getProtocol(), 2));
   }
 }
Exemplo n.º 4
0
  /** @see java.net.DatagramSocketImpl#send(java.net.DatagramPacket) */
  protected void send(DatagramPacket p) throws IOException {

    final IPv4Address dstAddress = new IPv4Address(p.getAddress());
    final IPv4Header ipHdr;
    ipHdr =
        new IPv4Header(
            getTos(), getTimeToLive(), IPPROTO_UDP, dstAddress, p.getLength() + UDP_HLEN);
    if (!getLocalAddress().isAnyLocalAddress() || (getDevice() != null)) {
      ipHdr.setSource(new IPv4Address(getLocalAddress()));
    }
    final UDPHeader udpHdr;
    final int srcPort = getLocalPort();
    // final int srcPort = p.getPort(); // or getLocalPort???? TODO Fix
    // srcPort issue
    udpHdr = new UDPHeader(srcPort, p.getPort(), p.getLength());

    final SocketBuffer skbuf = new SocketBuffer(p.getData(), p.getOffset(), p.getLength());
    skbuf.setDevice(getDevice());
    protocol.send(ipHdr, udpHdr, skbuf);
  }
Exemplo n.º 5
0
 /**
  * Send an TCP packet
  *
  * @param skbuf
  */
 protected void send(IPv4Header ipHdr, TCPHeader tcpHdr, SocketBuffer skbuf)
     throws SocketException {
   if (DEBUG) {
     if (log.isDebugEnabled()) {
       log.debug("send(ipHdr, " + tcpHdr + ')');
     }
   }
   skbuf.setTransportLayerHeader(tcpHdr);
   tcpHdr.prefixTo(skbuf);
   ipHdr.setDataLength(skbuf.getSize());
   ipService.transmit(ipHdr, skbuf);
   stat.opackets.inc();
 }
Exemplo n.º 6
0
 /**
  * Process the delivery of a fragment
  *
  * @param hdr
  * @param skbuf
  * @throws NetworkException
  */
 private void deliverFragment(IPv4Header hdr, SocketBuffer skbuf) throws SocketException {
   final Object key = hdr.getFragmentListKey();
   final IPv4FragmentList flist = (IPv4FragmentList) fragments.get(key);
   if (flist == null) {
     // This is a fragment for a new list
     fragments.put(key, new IPv4FragmentList(skbuf));
   } else {
     if (flist.isAlive()) {
       flist.add(skbuf);
       if (flist.isComplete()) {
         // The fragmentlist is now complete, deliver it
         final SocketBuffer pbuf = flist.getPacket();
         final IPv4Header phdr = (IPv4Header) pbuf.getNetworkLayerHeader();
         stat.reassembled.inc();
         deliver(phdr, pbuf);
       }
     } else {
       // Timeout of fragmentlist, destroy it
       fragments.remove(key);
     }
   }
 }
Exemplo n.º 7
0
  /**
   * Process a packet that has been received and matches getType()
   *
   * @param skbuf
   * @param deviceAPI
   * @throws SocketException
   */
  public void receive(SocketBuffer skbuf, NetDeviceAPI deviceAPI) throws SocketException {

    // Update statistics
    stat.ipackets.inc();

    // Get IP header
    final IPv4Header hdr = new IPv4Header(skbuf);
    if (!hdr.isChecksumOk()) {
      stat.badsum.inc();
      return;
    }
    // Set the header object in the buffer-field
    skbuf.setNetworkLayerHeader(hdr);

    // Remove header from skbuf-data
    skbuf.pull(hdr.getLength());
    // Trim the end of the message, to we have a valid length
    skbuf.trim(hdr.getDataLength());

    // Now test if the size of the buffer equals the datalength in the
    // header, if now ignore the packet
    if (skbuf.getSize() < hdr.getDataLength()) {
      stat.badlen.inc();
      return;
    }

    // Update the ARP cache for the source address
    updateARPCache(skbuf.getLinkLayerHeader().getSourceAddress(), hdr.getSourceAddress());

    // Get my IP address
    final IPv4ProtocolAddressInfo myAddrInfo =
        (IPv4ProtocolAddressInfo) deviceAPI.getProtocolAddressInfo(getProtocolID());
    if (myAddrInfo == null) {
      stat.nodevaddr.inc();
    }

    // Should I process this packet, or is it for somebody else?
    final IPv4Address dstAddr = hdr.getDestination();
    final boolean shouldProcess;
    if (myAddrInfo != null) {
      shouldProcess = myAddrInfo.contains(dstAddr);
    } else {
      // I don't have an IP address yet, if the linklayer says
      // it is for me, we'll process it, otherwise we'll drop it.
      shouldProcess = !skbuf.getLinkLayerHeader().getDestinationAddress().isBroadcast();
    }
    if (!shouldProcess) {
      // log.debug("IPPacket not for me, ignoring (dst=" + dstAddr + ")");
      return;
    }

    // Is it a fragment?
    if (hdr.isFragment()) {
      // Yes it is a fragment
      stat.fragments.inc();
      deliverFragment(hdr, skbuf);
    } else {
      // It is a complete packet, find the protocol handler
      // and let it do the rest
      deliver(hdr, skbuf);
    }

    // Do a cleanup of the fragmentlist from time to time
    final long now = System.currentTimeMillis();
    if ((now - lastFragmentCleanup) >= (IP_FRAGTIMEOUT * 2)) {
      removeDeadFragments();
    }
  }
Exemplo n.º 8
0
  /** @see org.jnode.net.TransportLayer#receive(org.jnode.net.SocketBuffer) */
  public void receive(SocketBuffer skbuf) throws SocketException {

    // Increment stats
    stat.ipackets.inc();

    // Get the IP header
    final IPv4Header ipHdr = (IPv4Header) skbuf.getNetworkLayerHeader();

    // Read the TCP header
    final TCPHeader hdr = new TCPHeader(skbuf);

    // Set the TCP header in the buffer-field
    skbuf.setTransportLayerHeader(hdr);
    // Remove the TCP header from the head of the buffer
    skbuf.pull(hdr.getLength());
    // Trim the buffer up to the length in the TCP header
    skbuf.trim(hdr.getDataLength());

    if (!hdr.isChecksumOk()) {
      if (DEBUG) {
        if (log.isDebugEnabled()) {
          log.debug("Receive: badsum: " + hdr);
        }
      }
      stat.badsum.inc();
    } else {
      if (DEBUG) {
        if (log.isDebugEnabled()) {
          log.debug("Receive: " + hdr);
        }
      }

      // Find the corresponding control block
      final TCPControlBlock cb =
          (TCPControlBlock)
              controlBlocks.lookup(
                  ipHdr.getSource(),
                  hdr.getSrcPort(),
                  ipHdr.getDestination(),
                  hdr.getDstPort(),
                  true);
      if (cb == null) {
        final boolean ack = hdr.isFlagAcknowledgeSet();
        final boolean rst = hdr.isFlagResetSet();

        stat.noport.inc();

        // Port unreachable
        if (ack && rst) {
          // the source is also unreachable
          log.debug(
              "Dropping segment due to: connection refused as the source is also unreachable");
        } else {
          processPortUnreachable(ipHdr, hdr);
        }
      } else {
        // Let the cb handle the receive
        cb.receive(hdr, skbuf);
      }
    }
  }