--- a/src/devices/point-to-point/point-to-point-net-device.cc	Fri Jul 27 20:45:07 2007 +0200
+++ b/src/devices/point-to-point/point-to-point-net-device.cc	Fri Jul 27 20:45:18 2007 +0200
@@ -28,6 +28,7 @@
 #include "ns3/composite-trace-resolver.h"
 #include "point-to-point-net-device.h"
 #include "point-to-point-channel.h"
+#include "ns3/llc-snap-header.h"
 
 NS_DEBUG_COMPONENT_DEFINE ("PointToPointNetDevice");
 
@@ -65,13 +66,30 @@
   m_queue = 0;
 }
 
+void PointToPointNetDevice::AddHeader(Packet& p, const MacAddress& dest,
+                                      uint16_t protocolNumber)
+{
+  LlcSnapHeader llc;
+  llc.SetType (protocolNumber);
+  p.AddHeader (llc);
+}
+
+bool PointToPointNetDevice::ProcessHeader(Packet& p, int& param)
+{
+  LlcSnapHeader llc;
+  p.RemoveHeader (llc);
+
+  param = llc.GetType ();
+
+  return true;
+}
+
 void PointToPointNetDevice::DoDispose()
 {
   m_channel = 0;
   NetDevice::DoDispose ();
 }
 
-
 void PointToPointNetDevice::SetDataRate(const DataRate& bps)
 {
   m_bps = bps;
@@ -82,7 +100,8 @@
   m_tInterframeGap = t;
 }
 
-bool PointToPointNetDevice::SendTo (Packet& p, const MacAddress& dest)
+bool PointToPointNetDevice::SendTo (Packet& p, const MacAddress& dest, 
+                                    uint16_t protocolNumber)
 {
   NS_DEBUG ("PointToPointNetDevice::SendTo (" << &p << ", " << &dest << ")");
   NS_DEBUG ("PointToPointNetDevice::SendTo (): UID is " << p.GetUid () << ")");
@@ -91,6 +110,7 @@
   // "go down" during the simulation?  Shouldn't we just wait for it
   // to come back up?
   NS_ASSERT (IsLinkUp ());
+  AddHeader(p, dest, protocolNumber);
 
 //
 // This class simulates a point to point device.  In the case of a serial
@@ -198,9 +218,12 @@
 void PointToPointNetDevice::Receive (Packet& p)
 {
   NS_DEBUG ("PointToPointNetDevice::Receive (" << &p << ")");
+  int param = 0;
+  Packet packet = p;
 
-  m_rxTrace (p);
-  ForwardUp (p);
+  ProcessHeader(packet, param);
+  m_rxTrace (packet);
+  ForwardUp (packet, param);
 }
 
 Ptr<Queue> PointToPointNetDevice::GetQueue(void) const 

--- a/src/devices/point-to-point/point-to-point-net-device.h	Fri Jul 27 20:45:07 2007 +0200
+++ b/src/devices/point-to-point/point-to-point-net-device.h	Fri Jul 27 20:45:18 2007 +0200
@@ -187,11 +187,18 @@
   static const DataRate& GetDefaultRate();
 
 private:
-  // unimplemented methods to make it impossible
-  // to copy these objects.
-  PointToPointNetDevice (const PointToPointNetDevice& nd);
-  PointToPointNetDevice& operator = (const PointToPointNetDevice&o);
-  
+  /**
+   * Adds the necessary headers and trailers to a packet of data in order to
+   * respect the protocol implemented by the agent.
+   */
+  void AddHeader(Packet& p, const MacAddress& dest, uint16_t protocolNumber);
+  /**
+   * Removes, from a packet of data, all headers and trailers that
+   * relate to the protocol implemented by the agent
+   * \return Returns true if the packet should be forwarded up the
+   * protocol stack.
+   */
+  bool ProcessHeader(Packet& p, int& param);
   /**
    * Send a Packet Down the Wire.
    *
@@ -202,9 +209,11 @@
    * @see NetDevice
    * @param p a reference to the packet to send
    * @param dest a reference to the MacAddress of the destination device
+   * @param protocolNumber Protocol Number used to find protocol touse
    * @returns true if success, false on failure
    */
-  virtual bool SendTo (Packet& p, const MacAddress& dest);
+  virtual bool SendTo (Packet& p, const MacAddress& dest, 
+                       uint16_t protocolNumber);
   /**
    * Start Sending a Packet Down the Wire.
    *

--- a/src/node/net-device.cc	Fri Jul 27 20:45:07 2007 +0200
+++ b/src/node/net-device.cc	Fri Jul 27 20:45:18 2007 +0200
@@ -22,12 +22,15 @@
 #include <iostream>
 #include "ns3/assert.h"
 #include "ns3/object.h"
+#include "ns3/debug.h"
+
 
 #include "channel.h"
 #include "net-device.h"
-#include "llc-snap-header.h"
 #include "node.h"
 
+NS_DEBUG_COMPONENT_DEFINE ("NetDevice");
+
 namespace ns3 {
 
 const InterfaceId NetDevice::iid = MakeInterfaceId ("NetDevice", Object::iid);
@@ -172,10 +175,7 @@
 {
   if (m_isUp)
     {
-      LlcSnapHeader llc;
-      llc.SetType (protocolNumber);
-      p.AddHeader (llc);
-      return SendTo(p, dest);
+      return SendTo(p, dest, protocolNumber);
     }
   else
     {
@@ -195,18 +195,24 @@
   return DoGetChannel ();
 }
 
-// Receive packet from below
+// Receive packets from below
 bool
-NetDevice::ForwardUp (Packet& packet)
+NetDevice::ForwardUp(Packet& p, uint32_t param)
 {
   bool retval = false;
-  LlcSnapHeader llc;
-  packet.RemoveHeader (llc);
+  Packet packet = p;
+
+  NS_DEBUG ("NetDevice::ForwardUp: UID is " << packet.GetUid()
+            << " device is: " << GetName());
+  
   if (!m_receiveCallback.IsNull ())
     {
-      retval = m_receiveCallback (this, packet, llc.GetType ());
+      retval = m_receiveCallback (this, packet, param);
+    } else {
+      NS_DEBUG ("NetDevice::Receive call back is NULL");
     }
-  return retval;
+
+    return retval;
 }
 
 void 

--- a/src/node/net-device.h	Fri Jul 27 20:45:07 2007 +0200
+++ b/src/node/net-device.h	Fri Jul 27 20:45:18 2007 +0200
@@ -17,6 +17,7 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
  * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
+ * Modified by Emmanuelle Laprise to remove dependance on LLC headers
  */
 #ifndef NET_DEVICE_H
 #define NET_DEVICE_H
@@ -227,6 +228,8 @@
 
   /**
    * \param p packet sent from below up to Network Device
+   * \param param Extra parameter extracted from header and needed by
+   * some protocols
    * \returns true if the packet was forwarded successfully,
    *          false otherwise.
    *
@@ -234,7 +237,8 @@
    * forwards it to the higher layers by calling this method
    * which is responsible for passing it up to the Rx callback.
    */
-  bool ForwardUp (Packet& p);
+  bool ForwardUp (Packet& p, uint32_t param);
+
 
   /**
    * The dispose method for this NetDevice class.
@@ -244,10 +248,13 @@
    */
   virtual void DoDispose (void);
 
+  Callback<bool,Ptr<NetDevice>,const Packet &,uint16_t> m_receiveCallback;
+
  private:
   /**
    * \param p packet to send
    * \param dest address of destination to which packet must be sent
+   * \param protocolNumber Number of the protocol (used with some protocols)
    * \returns true if the packet could be sent successfully, false
    *          otherwise.
    *
@@ -255,7 +262,7 @@
    * method.  When the link is Up, this method is invoked to ask 
    * subclasses to forward packets. Subclasses MUST override this method.
    */
-  virtual bool SendTo (Packet& p, const MacAddress& dest) = 0;
+  virtual bool SendTo (Packet& p, const MacAddress &dest, uint16_t protocolNumber) = 0;
   /**
    * \returns true if this NetDevice needs the higher-layers
    *          to perform ARP over it, false otherwise.
@@ -279,7 +286,7 @@
    */
   virtual Ptr<Channel> DoGetChannel (void) const = 0;
 
-  Ptr<Node>         m_node;
+  Ptr<Node>     m_node;
   std::string   m_name;
   uint16_t      m_ifIndex;
   MacAddress    m_address;
@@ -290,7 +297,6 @@
   bool          m_isMulticast;
   bool          m_isPointToPoint;
   Callback<void> m_linkChangeCallback;
-  Callback<bool,Ptr<NetDevice>,const Packet &,uint16_t> m_receiveCallback;
 };
 
 }; // namespace ns3