--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/internet-stack/ipv4-l4-demux.h	Mon Jun 09 15:40:22 2008 -0700
@@ -0,0 +1,85 @@
+// -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*-
+//
+// Copyright (c) 2006 Georgia Tech Research Corporation
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License version 2 as
+// published by the Free Software Foundation;
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+// Author: George F. Riley<riley@ece.gatech.edu>
+//
+
+// Define the layer 4 demultiplexer object for ns3.
+// George F. Riley, Georgia Tech, Fall 2006
+
+#ifndef IPV4_L4_DEMUX_H
+#define IPV4_L4_DEMUX_H
+
+#include <list>
+#include "ns3/object.h"
+#include "ns3/ptr.h"
+
+namespace ns3 {
+
+class Ipv4L4Protocol;
+class Node;
+
+/**
+ * \brief L4 Ipv4 Demux
+ */
+class Ipv4L4Demux : public Object
+{
+public:
+  static TypeId GetTypeId (void);
+  Ipv4L4Demux ();
+  virtual ~Ipv4L4Demux();
+
+  void SetNode (Ptr<Node> node);
+
+  /**
+   * \param protocol a template for the protocol to add to this L4 Demux.
+   * \returns the L4Protocol effectively added.
+   *
+   * Invoke Copy on the input template to get a copy of the input
+   * protocol which can be used on the Node on which this L4 Demux 
+   * is running. The new L4Protocol is registered internally as
+   * a working L4 Protocol and returned from this method.
+   * The caller does not get ownership of the returned pointer.
+   */
+  void Insert(Ptr<Ipv4L4Protocol> protocol);
+  /**
+   * \param protocolNumber number of protocol to lookup
+   *        in this L4 Demux
+   * \returns a matching L4 Protocol
+   *
+   * This method is typically called by lower layers
+   * to forward packets up the stack to the right protocol.
+   * It is also called from NodeImpl::GetUdp for example.
+   */
+  Ptr<Ipv4L4Protocol> GetProtocol(int protocolNumber);
+  /**
+   * \param protocol protocol to remove from this demux.
+   *
+   * The input value to this method should be the value
+   * returned from the Ipv4L4Protocol::Insert method.
+   */
+  void Remove (Ptr<Ipv4L4Protocol> protocol);
+protected:
+  virtual void DoDispose (void);
+private:
+  typedef std::list<Ptr<Ipv4L4Protocol> > L4List_t;
+  L4List_t m_protocols;
+  Ptr<Node> m_node;
+};
+
+} //namespace ns3
+#endif