implement ipv4 loopback for testing

src/node/ipv4-loopback-interface.cc

@@ -0,0 +1,74 @@
+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2007 INRIA
+ * All rights reserved.
+ *
+ * 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
+ *
+ * Authors: 
+ *  Mathieu Lacage <mathieu.lacage@sophia.inria.fr>,
+ */
+#include "ipv4-loopback-interface.h"
+#include "net-device.h"
+#include "node.h"
+#include "ipv4.h"
+
+namespace ns3 {
+
+class Ipv4DummyNetDevice : public NetDevice
+{
+public:
+  Ipv4DummyNetDevice (Node *node);
+  Node *PeekNode (void) const;
+private:
+  virtual bool SendTo (Packet& p, const MacAddress& dest);
+};
+
+Ipv4DummyNetDevice::Ipv4DummyNetDevice (Node *node)
+  : NetDevice (node, MacAddress ())
+{}
+Node *
+Ipv4DummyNetDevice::PeekNode (void) const
+{
+  return GetNode ();
+}
+bool 
+Ipv4DummyNetDevice::SendTo (Packet& p, const MacAddress& dest)
+{
+  return false;
+}
+
+
+Ipv4LoopbackInterface::Ipv4LoopbackInterface (Node *node)
+  : Ipv4Interface (new Ipv4DummyNetDevice (node))
+{
+}
+Ipv4LoopbackInterface::~Ipv4LoopbackInterface ()
+{
+  delete GetDevice ();
+}
+
+Node *
+Ipv4LoopbackInterface::GetNode (void) const
+{
+  return static_cast<Ipv4DummyNetDevice *> (GetDevice ())->PeekNode ();
+}
+
+void 
+Ipv4LoopbackInterface::SendTo (Packet packet, Ipv4Address dest)
+{
+  m_node->GetIpv4 ()->Receive (packet, *(this->GetDevice ()));
+}
+
+}//namespace ns3