Start of serious reorganization
The whole forwarding logic is (will be) moved to the Forwarding Strategy
class.
diff --git a/model/forwarding-strategy/ccnx-bestroute-strategy.cc b/model/forwarding-strategy/ccnx-bestroute-strategy.cc
new file mode 100644
index 0000000..75efdd4
--- /dev/null
+++ b/model/forwarding-strategy/ccnx-bestroute-strategy.cc
@@ -0,0 +1,119 @@
+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2011 University of California, Los Angeles
+ *
+ * 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: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ * Ilya Moiseenko <iliamo@cs.ucla.edu>
+ */
+
+#include "ccnx-bestroute-strategy.h"
+
+#include "ns3/ccnx-interest-header.h"
+#include "ns3/ccnx-pit.h"
+#include "ns3/ccnx-pit-entry.h"
+
+#include "ns3/assert.h"
+#include "ns3/log.h"
+
+#include <boost/foreach.hpp>
+#include <boost/lambda/lambda.hpp>
+#include <boost/lambda/bind.hpp>
+namespace ll = boost::lambda;
+
+NS_LOG_COMPONENT_DEFINE ("CcnxBestRouteStrategy");
+
+namespace ns3
+{
+
+using namespace __ccnx_private;
+
+NS_OBJECT_ENSURE_REGISTERED (CcnxBestRouteStrategy);
+
+TypeId CcnxBestRouteStrategy::GetTypeId (void)
+{
+ static TypeId tid = TypeId ("ns3::CcnxBestRouteStrategy")
+ .SetGroupName ("Ccnx")
+ .SetParent <CcnxForwardingStrategy> ()
+ .AddConstructor <CcnxBestRouteStrategy> ()
+ ;
+ return tid;
+}
+
+CcnxBestRouteStrategy::CcnxBestRouteStrategy ()
+{
+}
+
+bool
+CcnxBestRouteStrategy::PropagateInterest (Ptr<CcnxPitEntry> pitEntry,
+ const Ptr<CcnxFace> &incomingFace,
+ Ptr<CcnxInterestHeader> &header,
+ const Ptr<const Packet> &packet)
+{
+ NS_LOG_FUNCTION (this);
+
+
+
+ // Try to work out with just green faces
+ bool greenOk = PropagateInterestViaGreen (pitEntry, incomingFace, header, packet);
+ if (greenOk)
+ return true;
+
+ int propagatedCount = 0;
+
+ BOOST_FOREACH (const CcnxFibFaceMetric &metricFace, pitEntry->GetFibEntry ()->m_faces.get<i_metric> ())
+ {
+ if (metricFace.m_status == CcnxFibFaceMetric::NDN_FIB_RED) // all non-read faces are in front
+ break;
+
+ if (metricFace.m_face == incomingFace)
+ continue; // same face as incoming, don't forward
+
+ if (pitEntry->GetIncoming ().find (metricFace.m_face) != pitEntry->GetIncoming ().end ())
+ continue; // don't forward to face that we received interest from
+
+ CcnxPitEntryOutgoingFaceContainer::type::iterator outgoing =
+ pitEntry->GetOutgoing ().find (metricFace.m_face);
+
+ if (outgoing != pitEntry->GetOutgoing ().end () &&
+ outgoing->m_retxCount >= pitEntry->GetMaxRetxCount ())
+ {
+ NS_LOG_ERROR (outgoing->m_retxCount << " >= " << pitEntry->GetMaxRetxCount ());
+ continue; // already forwarded before during this retransmission cycle
+ }
+
+ bool faceAvailable = metricFace.m_face->IsBelowLimit ();
+ if (!faceAvailable) // huh...
+ {
+ continue;
+ }
+
+ pitEntry->AddOutgoing (metricFace.m_face);
+
+ Ptr<Packet> packetToSend = packet->Copy ();
+
+ //transmission
+ metricFace.m_face->Send (packetToSend);
+ m_outInterests (header, metricFace.m_face);
+
+ propagatedCount++;
+ break; // do only once
+ }
+
+ NS_LOG_INFO ("Propagated to " << propagatedCount << " faces");
+ return propagatedCount > 0;
+}
+
+} //namespace ns3
diff --git a/model/forwarding-strategy/ccnx-bestroute-strategy.h b/model/forwarding-strategy/ccnx-bestroute-strategy.h
new file mode 100644
index 0000000..6768da6
--- /dev/null
+++ b/model/forwarding-strategy/ccnx-bestroute-strategy.h
@@ -0,0 +1,59 @@
+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2011 University of California, Los Angeles
+ *
+ * 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: Ilya Moiseenko <iliamo@cs.ucla.edu>
+ */
+
+
+#ifndef CCNX_BESTROUTE_STRATEGY_H
+#define CCNX_BESTROUTE_STRATEGY_H
+
+#include "ccnx-forwarding-strategy.h"
+
+namespace ns3
+{
+
+class CcnxFace;
+class CcnxInterestHeader;
+
+/**
+ * \ingroup ccnx
+ * \brief Best route strategy
+ *
+ * \todo Describe
+ */
+class CcnxBestRouteStrategy : public CcnxForwardingStrategy
+{
+public:
+ static TypeId GetTypeId (void);
+
+ /**
+ * @brief Default constructor
+ */
+ CcnxBestRouteStrategy ();
+
+ // inherited from CcnxForwardingStrategy
+ virtual bool
+ PropagateInterest (Ptr<CcnxPitEntry> pitEntry,
+ const Ptr<CcnxFace> &incomingFace,
+ Ptr<CcnxInterestHeader> &header,
+ const Ptr<const Packet> &packet);
+};
+
+} //namespace ns3
+
+#endif /* CCNX_BESTROUTE_STRATEGY_H */
diff --git a/model/forwarding-strategy/ccnx-flooding-strategy.cc b/model/forwarding-strategy/ccnx-flooding-strategy.cc
new file mode 100644
index 0000000..c803560
--- /dev/null
+++ b/model/forwarding-strategy/ccnx-flooding-strategy.cc
@@ -0,0 +1,132 @@
+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2011 University of California, Los Angeles
+ *
+ * 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: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ * Ilya Moiseenko <iliamo@cs.ucla.edu>
+ */
+
+#include "ccnx-flooding-strategy.h"
+
+#include "ns3/ccnx-interest-header.h"
+#include "ns3/ccnx-pit.h"
+#include "ns3/ccnx-pit-entry.h"
+
+#include "ns3/assert.h"
+#include "ns3/log.h"
+#include "ns3/simulator.h"
+#include "ns3/boolean.h"
+
+#include <boost/ref.hpp>
+#include <boost/foreach.hpp>
+#include <boost/lambda/lambda.hpp>
+#include <boost/lambda/bind.hpp>
+namespace ll = boost::lambda;
+
+NS_LOG_COMPONENT_DEFINE ("CcnxFloodingStrategy");
+
+namespace ns3
+{
+
+using namespace __ccnx_private;
+
+NS_OBJECT_ENSURE_REGISTERED (CcnxFloodingStrategy);
+
+TypeId CcnxFloodingStrategy::GetTypeId (void)
+{
+ static TypeId tid = TypeId ("ns3::CcnxFloodingStrategy")
+ .SetGroupName ("Ccnx")
+ .SetParent <CcnxForwardingStrategy> ()
+ .AddConstructor <CcnxFloodingStrategy> ()
+
+ .AddAttribute ("SmartFlooding",
+ "If true then if a GREEN face exists, Interests will be sent only to such face (!only to one green face!)",
+ BooleanValue (false),
+ MakeBooleanAccessor (&CcnxFloodingStrategy::m_smartFlooding),
+ MakeBooleanChecker ())
+ ;
+ return tid;
+}
+
+CcnxFloodingStrategy::CcnxFloodingStrategy ()
+{
+}
+
+bool
+CcnxFloodingStrategy::PropagateInterest (Ptr<CcnxPitEntry> pitEntry,
+ const Ptr<CcnxFace> &incomingFace,
+ Ptr<CcnxInterestHeader> &header,
+ const Ptr<const Packet> &packet)
+{
+ NS_LOG_FUNCTION (this);
+
+ if (m_smartFlooding)
+ {
+ // Try to work out with just green faces
+ bool greenOk = PropagateInterestViaGreen (pitEntry, incomingFace, header, packet);
+ if (greenOk)
+ return true;
+
+ // boo... :(
+ }
+
+ int propagatedCount = 0;
+
+ BOOST_FOREACH (const CcnxFibFaceMetric &metricFace, pitEntry->GetFibEntry ()->m_faces.get<i_metric> ())
+ {
+ NS_LOG_DEBUG ("Trying " << boost::cref(metricFace));
+ if (metricFace.m_status == CcnxFibFaceMetric::NDN_FIB_RED) // all non-read faces are in the front of the list
+ break;
+
+ if (metricFace.m_face == incomingFace)
+ {
+ NS_LOG_DEBUG ("continue (same as incoming)");
+ continue; // same face as incoming, don't forward
+ }
+
+ CcnxPitEntryOutgoingFaceContainer::type::iterator outgoing =
+ pitEntry->GetOutgoing ().find (metricFace.m_face);
+
+ if (outgoing != pitEntry->GetOutgoing ().end () &&
+ outgoing->m_retxCount >= pitEntry->GetMaxRetxCount ())
+ {
+ NS_LOG_DEBUG ("continue (same as previous outgoing)");
+ continue; // already forwarded before during this retransmission cycle
+ }
+ NS_LOG_DEBUG ("max retx count: " << pitEntry->GetMaxRetxCount ());
+
+ bool faceAvailable = metricFace.m_face->IsBelowLimit ();
+ if (!faceAvailable) // huh...
+ {
+ continue;
+ }
+
+ pitEntry->AddOutgoing (metricFace.m_face);
+
+ Ptr<Packet> packetToSend = packet->Copy ();
+
+ //transmission
+ metricFace.m_face->Send (packetToSend);
+ m_outInterests (header, metricFace.m_face);
+
+ propagatedCount++;
+ }
+
+ NS_LOG_INFO ("Propagated to " << propagatedCount << " faces");
+ return propagatedCount > 0;
+}
+
+} //namespace ns3
diff --git a/model/forwarding-strategy/ccnx-flooding-strategy.h b/model/forwarding-strategy/ccnx-flooding-strategy.h
new file mode 100644
index 0000000..fa77988
--- /dev/null
+++ b/model/forwarding-strategy/ccnx-flooding-strategy.h
@@ -0,0 +1,61 @@
+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2011 University of California, Los Angeles
+ *
+ * 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: Ilya Moiseenko <iliamo@cs.ucla.edu>
+ */
+
+#ifndef CCNX_FLOODING_STRATEGY_H
+#define CCNX_FLOODING_STRATEGY_H
+
+#include "ccnx-forwarding-strategy.h"
+
+namespace ns3
+{
+
+class CcnxFace;
+class CcnxInterestHeader;
+
+/**
+ * \ingroup ccnx
+ * \brief Flooding strategy
+ *
+ * \todo Describe
+ */
+class CcnxFloodingStrategy : public CcnxForwardingStrategy
+{
+public:
+ static TypeId GetTypeId (void);
+
+ /**
+ * @brief Default constructor
+ */
+ CcnxFloodingStrategy ();
+
+ // inherited from CcnxForwardingStrategy
+ virtual bool
+ PropagateInterest (Ptr<CcnxPitEntry> pitEntry,
+ const Ptr<CcnxFace> &incomingFace,
+ Ptr<CcnxInterestHeader> &header,
+ const Ptr<const Packet> &packet);
+
+private:
+ bool m_smartFlooding;
+};
+
+} //namespace ns3
+
+#endif /* CCNX_FLOODING_STRATEGY_H */
diff --git a/model/forwarding-strategy/ccnx-forwarding-strategy.cc b/model/forwarding-strategy/ccnx-forwarding-strategy.cc
new file mode 100644
index 0000000..9cdfa4d
--- /dev/null
+++ b/model/forwarding-strategy/ccnx-forwarding-strategy.cc
@@ -0,0 +1,494 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2011 University of California, Los Angeles
+ *
+ * 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: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ * Ilya Moiseenko <iliamo@cs.ucla.edu>
+ */
+
+#include "ccnx-forwarding-strategy.h"
+
+#include "ns3/ccnx-pit.h"
+#include "ns3/ccnx-pit-entry.h"
+#include "ns3/ccnx-interest-header.h"
+#include "ns3/ccnx-content-object-header.h"
+#include "ns3/ccnx-pit.h"
+#include "ns3/ccnx-fib.h"
+#include "ns3/ccnx-content-store.h"
+
+#include "ns3/assert.h"
+#include "ns3/ptr.h"
+#include "ns3/log.h"
+#include "ns3/simulator.h"
+#include "ns3/boolean.h"
+#include "ns3/string.h"
+
+#include <boost/ref.hpp>
+#include <boost/foreach.hpp>
+#include <boost/lambda/lambda.hpp>
+#include <boost/lambda/bind.hpp>
+#include <boost/tuple/tuple.hpp>
+namespace ll = boost::lambda;
+
+NS_LOG_COMPONENT_DEFINE ("CcnxForwardingStrategy");
+
+namespace ns3 {
+
+using namespace __ccnx_private;
+
+NS_OBJECT_ENSURE_REGISTERED (CcnxForwardingStrategy);
+
+TypeId CcnxForwardingStrategy::GetTypeId (void)
+{
+ static TypeId tid = TypeId ("ns3::CcnxForwardingStrategy")
+ .SetGroupName ("Ccnx")
+ .SetParent<Object> ()
+
+ ////////////////////////////////////////////////////////////////////
+ ////////////////////////////////////////////////////////////////////
+
+ .AddTraceSource ("OutInterests", "OutInterests", MakeTraceSourceAccessor (&CcnxForwardingStrategy::m_outInterests))
+ .AddTraceSource ("InInterests", "InInterests", MakeTraceSourceAccessor (&CcnxForwardingStrategy::m_inInterests))
+ .AddTraceSource ("DropInterests", "DropInterests", MakeTraceSourceAccessor (&CcnxForwardingStrategy::m_dropInterests))
+
+ ////////////////////////////////////////////////////////////////////
+ ////////////////////////////////////////////////////////////////////
+
+ .AddTraceSource ("OutNacks", "OutNacks", MakeTraceSourceAccessor (&CcnxForwardingStrategy::m_outNacks))
+ .AddTraceSource ("InNacks", "InNacks", MakeTraceSourceAccessor (&CcnxForwardingStrategy::m_inNacks))
+ .AddTraceSource ("DropNacks", "DropNacks", MakeTraceSourceAccessor (&CcnxForwardingStrategy::m_dropNacks))
+
+ ////////////////////////////////////////////////////////////////////
+ ////////////////////////////////////////////////////////////////////
+
+ .AddTraceSource ("OutData", "OutData", MakeTraceSourceAccessor (&CcnxForwardingStrategy::m_outData))
+ .AddTraceSource ("InData", "InData", MakeTraceSourceAccessor (&CcnxForwardingStrategy::m_inData))
+ .AddTraceSource ("DropData", "DropData", MakeTraceSourceAccessor (&CcnxForwardingStrategy::m_dropData))
+
+ .AddAttribute ("EnableNACKs", "Enabling support of NACKs",
+ BooleanValue (false),
+ MakeBooleanAccessor (&CcnxForwardingStrategy::m_nacksEnabled),
+ MakeBooleanChecker ())
+ .AddAttribute ("CacheUnsolicitedData", "Cache overheard data that have not been requested",
+ BooleanValue (false),
+ MakeBooleanAccessor (&CcnxForwardingStrategy::m_cacheUnsolicitedData),
+ MakeBooleanChecker ())
+
+ ;
+ return tid;
+}
+
+CcnxForwardingStrategy::CcnxForwardingStrategy ()
+{
+}
+
+CcnxForwardingStrategy::~CcnxForwardingStrategy ()
+{
+}
+
+void
+CcnxForwardingStrategy::NotifyNewAggregate ()
+{
+ if (m_pit == 0)
+ {
+ m_pit = GetObject<CcnxPit> ();
+ }
+ if (m_fib == 0)
+ {
+ m_fib = GetObject<CcnxFib> ();
+ }
+ if (m_contentStore == 0)
+ {
+ m_contentStore = GetObject<CcnxContentStore> ();
+ }
+
+ Object::NotifyNewAggregate ();
+}
+
+void
+CcnxForwardingStrategy::DoDispose ()
+{
+ m_pit = 0;
+ m_contentStore = 0;
+ m_fib = 0;
+
+ Object::DoDispose ();
+}
+
+void
+CcnxForwardingStrategy::OnInterest (const Ptr<CcnxFace> &incomingFace,
+ Ptr<CcnxInterestHeader> &header,
+ const Ptr<const Packet> &packet)
+{
+ m_inInterests (header, incomingFace);
+
+ Ptr<CcnxPitEntry> pitEntry = m_pit->Lookup (*header);
+ if (pitEntry == 0)
+ {
+ pitEntry = m_pit->Create (header);
+ }
+
+ if (pitEntry == 0)
+ {
+ // if it is still not created, then give up processing
+ m_dropInterests (header, incomingFace);
+ return;
+ }
+
+ bool isNew = pitEntry->GetIncoming ().size () == 0 && pitEntry->GetOutgoing ().size () == 0;
+ bool isDuplicated = true;
+ if (!pitEntry->IsNonceSeen (header->GetNonce ()))
+ {
+ pitEntry->AddSeenNonce (header->GetNonce ());
+ isDuplicated = false;
+ }
+
+ NS_LOG_FUNCTION (header->GetName () << header->GetNonce () << boost::cref (*incomingFace) << isDuplicated);
+
+ /////////////////////////////////////////////////////////////////////////////////////////
+ /////////////////////////////////////////////////////////////////////////////////////////
+ /////////////////////////////////////////////////////////////////////////////////////////
+ // //
+ // !!!! IMPORTANT CHANGE !!!! Duplicate interests will create incoming face entry !!!! //
+ // //
+ /////////////////////////////////////////////////////////////////////////////////////////
+ /////////////////////////////////////////////////////////////////////////////////////////
+ /////////////////////////////////////////////////////////////////////////////////////////
+
+ // Data is not in cache
+ CcnxPitEntry::in_iterator inFace = pitEntry->GetIncoming ().find (incomingFace);
+ CcnxPitEntry::out_iterator outFace = pitEntry->GetOutgoing ().find (incomingFace);
+
+ bool isRetransmitted = false;
+
+ if (inFace != pitEntry->GetIncoming ().end ())
+ {
+ // CcnxPitEntryIncomingFace.m_arrivalTime keeps track arrival time of the first packet... why?
+
+ isRetransmitted = true;
+ // this is almost definitely a retransmission. But should we trust the user on that?
+ }
+ else
+ {
+ inFace = pitEntry->AddIncoming (incomingFace);
+ }
+ //////////////////////////////////////////////////////////////////////////////////
+ //////////////////////////////////////////////////////////////////////////////////
+ //////////////////////////////////////////////////////////////////////////////////
+
+ if (isDuplicated)
+ {
+ NS_LOG_DEBUG ("Received duplicatie interest on " << *incomingFace);
+ m_dropInterests (header, incomingFace);
+
+ /**
+ * This condition will handle "routing" loops and also recently satisfied interests.
+ * Every time interest is satisfied, PIT entry (with empty incoming and outgoing faces)
+ * is kept for another small chunk of time.
+ */
+
+ if (m_nacksEnabled)
+ {
+ NS_LOG_DEBUG ("Sending NACK_LOOP");
+ header->SetNack (CcnxInterestHeader::NACK_LOOP);
+ Ptr<Packet> nack = Create<Packet> ();
+ nack->AddHeader (*header);
+
+ incomingFace->Send (nack);
+ m_outNacks (header, incomingFace);
+ }
+
+ return;
+ }
+
+ Ptr<Packet> contentObject;
+ Ptr<const CcnxContentObjectHeader> contentObjectHeader; // used for tracing
+ Ptr<const Packet> payload; // used for tracing
+ boost::tie (contentObject, contentObjectHeader, payload) = m_contentStore->Lookup (header);
+ if (contentObject != 0)
+ {
+ NS_ASSERT (contentObjectHeader != 0);
+ NS_LOG_LOGIC("Found in cache");
+
+ OnDataDelayed (contentObjectHeader, payload, contentObject);
+ return;
+ }
+
+ // update PIT entry lifetime
+ pitEntry->UpdateLifetime (header->GetInterestLifetime ());
+
+ if (outFace != pitEntry->GetOutgoing ().end ())
+ {
+ NS_LOG_DEBUG ("Non duplicate interests from the face we have sent interest to. Don't suppress");
+ // got a non-duplicate interest from the face we have sent interest to
+ // Probably, there is no point in waiting data from that face... Not sure yet
+
+ // If we're expecting data from the interface we got the interest from ("producer" asks us for "his own" data)
+ // Mark interface YELLOW, but keep a small hope that data will come eventually.
+
+ // ?? not sure if we need to do that ?? ...
+
+ pitEntry->GetFibEntry ()->UpdateStatus (incomingFace, CcnxFibFaceMetric::NDN_FIB_YELLOW);
+ // StaticCast<CcnxFibImpl> (m_fib)->modify(pitEntry->GetFibEntry (),
+ // ll::bind (&CcnxFibEntry::UpdateStatus,
+ // ll::_1, incomingFace, CcnxFibFaceMetric::NDN_FIB_YELLOW));
+ }
+ else
+ if (!isNew && !isRetransmitted)
+ {
+ // Suppress this interest if we're still expecting data from some other face
+ NS_LOG_DEBUG ("Suppress interests");
+ m_dropInterests (header, incomingFace);
+ return;
+ }
+
+ /////////////////////////////////////////////////////////////////////
+ // Propagate
+ /////////////////////////////////////////////////////////////////////
+
+ bool propagated = PropagateInterest (pitEntry, incomingFace, header, packet);
+
+ if (!propagated && isRetransmitted) //give another chance if retransmitted
+ {
+ // increase max number of allowed retransmissions
+ pitEntry->IncreaseAllowedRetxCount ();
+
+ // try again
+ propagated = PropagateInterest (pitEntry, incomingFace, header, packet);
+ }
+
+ // ForwardingStrategy will try its best to forward packet to at least one interface.
+ // If no interests was propagated, then there is not other option for forwarding or
+ // ForwardingStrategy failed to find it.
+ if (!propagated)
+ {
+ NS_LOG_DEBUG ("Not propagated");
+ m_dropInterests (header, incomingFace);
+ GiveUpInterest (pitEntry, header);
+ }
+}
+
+void
+CcnxForwardingStrategy::OnData (const Ptr<CcnxFace> &incomingFace,
+ Ptr<CcnxContentObjectHeader> &header,
+ Ptr<Packet> &payload,
+ const Ptr<const Packet> &packet)
+{
+ NS_LOG_FUNCTION (incomingFace << header->GetName () << payload << packet);
+ m_inData (header, payload, incomingFace);
+
+ // 1. Lookup PIT entry
+ Ptr<CcnxPitEntry> pitEntry = m_pit->Lookup (*header);
+ if (pitEntry != 0)
+ {
+ // Note that with MultiIndex we need to modify entries indirectly
+
+ CcnxPitEntry::out_iterator out = pitEntry->GetOutgoing ().find (incomingFace);
+
+ // If we have sent interest for this data via this face, then update stats.
+ if (out != pitEntry->GetOutgoing ().end ())
+ {
+ pitEntry->GetFibEntry ()->UpdateFaceRtt (incomingFace, Simulator::Now () - out->m_sendTime);
+ // StaticCast<CcnxFibImpl> (m_fib)->modify (pitEntry->GetFibEntry (),
+ // ll::bind (&CcnxFibEntry::UpdateFaceRtt,
+ // ll::_1,
+ // incomingFace,
+ // Simulator::Now () - out->m_sendTime));
+ }
+ else
+ {
+ // Unsolicited data, but we're interested in it... should we get it?
+ // Potential hole for attacks
+
+ if (m_cacheUnsolicitedData)
+ {
+ // Optimistically add or update entry in the content store
+ m_contentStore->Add (header, payload);
+ }
+ else
+ {
+ NS_LOG_ERROR ("PIT entry for "<< header->GetName ()<<" is valid, "
+ "but outgoing entry for interface "<< boost::cref(*incomingFace) <<" doesn't exist\n");
+ }
+ // ignore unsolicited data
+ return;
+ }
+
+ // Update metric status for the incoming interface in the corresponding FIB entry
+ pitEntry->GetFibEntry ()->UpdateStatus (incomingFace, CcnxFibFaceMetric::NDN_FIB_GREEN);
+ // StaticCast<CcnxFibImpl>(m_fib)->modify (pitEntry->GetFibEntry (),
+ // ll::bind (&CcnxFibEntry::UpdateStatus, ll::_1,
+ // incomingFace, CcnxFibFaceMetric::NDN_FIB_GREEN));
+
+ // Add or update entry in the content store
+ m_contentStore->Add (header, payload);
+
+ pitEntry->RemoveIncoming (incomingFace);
+
+ if (pitEntry->GetIncoming ().size () == 0)
+ {
+ // Set pruning timout on PIT entry (instead of deleting the record)
+ m_pit->MarkErased (pitEntry);
+ }
+ else
+ {
+ OnDataDelayed (header, payload, packet);
+ }
+ }
+ else
+ {
+ NS_LOG_DEBUG ("Pit entry not found");
+ if (m_cacheUnsolicitedData)
+ {
+ // Optimistically add or update entry in the content store
+ m_contentStore->Add (header, payload);
+ }
+ else
+ {
+ // Drop data packet if PIT entry is not found
+ // (unsolicited data packets should not "poison" content store)
+
+ //drop dulicated or not requested data packet
+ m_dropData (header, payload, incomingFace);
+ }
+ return; // do not process unsoliced data packets
+ }
+}
+
+
+bool
+CcnxForwardingStrategy::PropagateInterestViaGreen (Ptr<CcnxPitEntry> pitEntry,
+ const Ptr<CcnxFace> &incomingFace,
+ Ptr<CcnxInterestHeader> &header,
+ const Ptr<const Packet> &packet)
+{
+ NS_LOG_FUNCTION (this);
+ NS_ASSERT_MSG (m_pit != 0, "PIT should be aggregated with forwarding strategy");
+
+ int propagatedCount = 0;
+
+ BOOST_FOREACH (const CcnxFibFaceMetric &metricFace, pitEntry->GetFibEntry ()->m_faces.get<i_metric> ())
+ {
+ if (metricFace.m_status == CcnxFibFaceMetric::NDN_FIB_RED ||
+ metricFace.m_status == CcnxFibFaceMetric::NDN_FIB_YELLOW)
+ break; //propagate only to green faces
+
+ if (pitEntry->GetIncoming ().find (metricFace.m_face) != pitEntry->GetIncoming ().end ())
+ continue; // don't forward to face that we received interest from
+
+ CcnxPitEntryOutgoingFaceContainer::type::iterator outgoing =
+ pitEntry->GetOutgoing ().find (metricFace.m_face);
+
+ if (outgoing != pitEntry->GetOutgoing ().end () &&
+ outgoing->m_retxCount >= pitEntry->GetMaxRetxCount ())
+ {
+ NS_LOG_DEBUG ("retxCount: " << outgoing->m_retxCount << ", maxRetxCount: " << pitEntry->GetMaxRetxCount ());
+ continue;
+ }
+
+ bool faceAvailable = metricFace.m_face->IsBelowLimit ();
+ if (!faceAvailable) // huh...
+ {
+ // let's try different green face
+ continue;
+ }
+
+ pitEntry->AddOutgoing (metricFace.m_face);
+
+ Ptr<Packet> packetToSend = packet->Copy ();
+
+ //transmission
+ metricFace.m_face->Send (packetToSend);
+ m_outInterests (header, metricFace.m_face);
+
+ propagatedCount++;
+ break; // propagate only one interest
+ }
+
+ return propagatedCount > 0;
+}
+
+void
+CcnxForwardingStrategy::OnDataDelayed (Ptr<const CcnxContentObjectHeader> header,
+ Ptr<const Packet> payload,
+ const Ptr<const Packet> &packet)
+{
+ // 1. Lookup PIT entry
+ Ptr<CcnxPitEntry> pitEntry = m_pit->Lookup (*header);
+ if (pitEntry != 0)
+ {
+ //satisfy all pending incoming Interests
+ BOOST_FOREACH (const CcnxPitEntryIncomingFace &incoming, pitEntry->GetIncoming ())
+ {
+ incoming.m_face->Send (packet->Copy ());
+ m_outData (header, payload, false, incoming.m_face);
+ NS_LOG_DEBUG ("Satisfy " << *incoming.m_face);
+
+ // successfull forwarded data trace
+ }
+
+ if (pitEntry->GetIncoming ().size () > 0)
+ {
+ // All incoming interests are satisfied. Remove them
+ pitEntry->ClearIncoming ();
+
+ // Remove all outgoing faces
+ pitEntry->ClearOutgoing ();
+
+ // Set pruning timout on PIT entry (instead of deleting the record)
+ m_pit->MarkErased (pitEntry);
+ }
+ }
+ else
+ {
+ NS_LOG_DEBUG ("Pit entry not found (was satisfied and removed before)");
+ return; // do not process unsoliced data packets
+ }
+}
+
+void
+CcnxForwardingStrategy::GiveUpInterest (Ptr<CcnxPitEntry> pitEntry,
+ Ptr<CcnxInterestHeader> header)
+{
+ NS_LOG_FUNCTION (this);
+
+ if (m_nacksEnabled)
+ {
+ Ptr<Packet> packet = Create<Packet> ();
+ header->SetNack (CcnxInterestHeader::NACK_GIVEUP_PIT);
+ packet->AddHeader (*header);
+
+ BOOST_FOREACH (const CcnxPitEntryIncomingFace &incoming, pitEntry->GetIncoming ())
+ {
+ NS_LOG_DEBUG ("Send NACK for " << boost::cref (header->GetName ()) << " to " << boost::cref (*incoming.m_face));
+ incoming.m_face->Send (packet->Copy ());
+
+ m_outNacks (header, incoming.m_face);
+ }
+
+ // All incoming interests cannot be satisfied. Remove them
+ pitEntry->ClearIncoming ();
+
+ // Remove also outgoing
+ pitEntry->ClearOutgoing ();
+
+ // Set pruning timout on PIT entry (instead of deleting the record)
+ m_pit->MarkErased (pitEntry);
+ }
+}
+
+
+} //namespace ns3
diff --git a/model/forwarding-strategy/ccnx-forwarding-strategy.h b/model/forwarding-strategy/ccnx-forwarding-strategy.h
new file mode 100644
index 0000000..20d92a4
--- /dev/null
+++ b/model/forwarding-strategy/ccnx-forwarding-strategy.h
@@ -0,0 +1,184 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2011 University of California, Los Angeles
+ *
+ * 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: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ * Ilya Moiseenko <iliamo@cs.ucla.edu>
+ */
+#ifndef CCNX_FORWARDING_STRATEGY_H
+#define CCNX_FORWARDING_STRATEGY_H
+
+#include "ns3/packet.h"
+#include "ns3/callback.h"
+#include "ns3/object.h"
+#include "ns3/traced-callback.h"
+
+namespace ns3 {
+
+class CcnxFace;
+class CcnxInterestHeader;
+class CcnxContentObjectHeader;
+class CcnxPit;
+class CcnxPitEntry;
+class CcnxFibFaceMetric;
+class CcnxFib;
+class CcnxContentStore;
+
+/**
+ * \ingroup ccnx
+ * \brief Abstract base class for CCNx forwarding strategies
+ */
+class CcnxForwardingStrategy : public Object
+{
+public:
+ static TypeId GetTypeId (void);
+
+ /**
+ * @brief Default constructor
+ */
+ CcnxForwardingStrategy ();
+ virtual ~CcnxForwardingStrategy ();
+
+ /**
+ * \brief Actual processing of incoming CCNx interests. Note, interests do not have payload
+ *
+ * Processing Interest packets
+ * @param face incoming face
+ * @param header deserialized Interest header
+ * @param packet original packet
+ */
+ virtual void
+ OnInterest (const Ptr<CcnxFace> &face,
+ Ptr<CcnxInterestHeader> &header,
+ const Ptr<const Packet> &p);
+
+ /**
+ * \brief Actual processing of incoming CCNx content objects
+ *
+ * Processing ContentObject packets
+ * @param face incoming face
+ * @param header deserialized ContentObject header
+ * @param payload data packet payload
+ * @param packet original packet
+ */
+ virtual void
+ OnData (const Ptr<CcnxFace> &face,
+ Ptr<CcnxContentObjectHeader> &header,
+ Ptr<Packet> &payload,
+ const Ptr<const Packet> &packet);
+
+// protected:
+ /**
+ * @brief Base method to propagate the interest according to the forwarding strategy
+ *
+ * @param pitEntry Reference to PIT entry (reference to corresponding FIB entry inside)
+ * @param incomingFace Incoming face
+ * @param header CcnxInterestHeader
+ * @param packet Original Interest packet
+ * @param sendCallback Send callback
+ *
+ * @return true if interest was successfully propagated, false if all options have failed
+ */
+ virtual bool
+ PropagateInterest (Ptr<CcnxPitEntry> pitEntry,
+ const Ptr<CcnxFace> &incomingFace,
+ Ptr<CcnxInterestHeader> &header,
+ const Ptr<const Packet> &packet) = 0;
+
+protected:
+ /**
+ * @brief Propagate interest via a green interface. Fail, if no green interfaces available
+ *
+ * @param pitEntry Reference to PIT entry (reference to corresponding FIB entry inside)
+ * @param incomingFace Incoming face
+ * @param header CcnxInterestHeader
+ * @param packet Original Interest packet
+ * @param sendCallback Send callback
+ * @return true if interest was successfully propagated, false if all options have failed
+ *
+ * \see PropagateInterest
+ */
+ bool
+ PropagateInterestViaGreen (Ptr<CcnxPitEntry> pitEntry,
+ const Ptr<CcnxFace> &incomingFace,
+ Ptr<CcnxInterestHeader> &header,
+ const Ptr<const Packet> &packet);
+
+ virtual void
+ GiveUpInterest (Ptr<CcnxPitEntry> pitEntry,
+ Ptr<CcnxInterestHeader> header);
+
+ virtual void
+ OnDataDelayed (Ptr<const CcnxContentObjectHeader> header,
+ Ptr<const Packet> payload,
+ const Ptr<const Packet> &packet);
+
+protected:
+ // inherited from Object class
+ virtual void NotifyNewAggregate (); ///< @brief Even when object is aggregated to another Object
+ virtual void DoDispose (); ///< @brief Do cleanup
+
+protected:
+ Ptr<CcnxPit> m_pit; ///< \brief Reference to PIT to which this forwarding strategy is associated
+ Ptr<CcnxFib> m_fib; ///< \brief FIB
+ Ptr<CcnxContentStore> m_contentStore; ///< \brief Content store (for caching purposes only)
+
+ bool m_nacksEnabled;
+ bool m_cacheUnsolicitedData;
+
+ // transmittedInterestTrace is inside ForwardingStrategy
+
+
+ TracedCallback<Ptr<const CcnxInterestHeader>,
+ Ptr<const CcnxFace> > m_outInterests; ///< @brief Transmitted interests trace
+
+ TracedCallback<Ptr<const CcnxInterestHeader>,
+ Ptr<const CcnxFace> > m_inInterests; ///< @brief trace of incoming Interests
+
+ TracedCallback<Ptr<const CcnxInterestHeader>,
+ Ptr<const CcnxFace> > m_dropInterests; ///< @brief trace of dropped Interests
+
+ ////////////////////////////////////////////////////////////////////
+ ////////////////////////////////////////////////////////////////////
+ ////////////////////////////////////////////////////////////////////
+
+ TracedCallback<Ptr<const CcnxInterestHeader>,
+ Ptr<const CcnxFace> > m_outNacks; ///< @brief trace of outgoing NACKs
+
+ TracedCallback<Ptr<const CcnxInterestHeader>,
+ Ptr<const CcnxFace> > m_inNacks; ///< @brief trace of incoming NACKs
+
+ TracedCallback<Ptr<const CcnxInterestHeader>,
+ Ptr<const CcnxFace> > m_dropNacks; ///< @brief trace of dropped NACKs
+
+ ////////////////////////////////////////////////////////////////////
+ ////////////////////////////////////////////////////////////////////
+ ////////////////////////////////////////////////////////////////////
+
+ TracedCallback<Ptr<const CcnxContentObjectHeader>, Ptr<const Packet>,
+ bool /*from cache*/,
+ Ptr<const CcnxFace> > m_outData; ///< @brief trace of outgoing Data
+
+ TracedCallback<Ptr<const CcnxContentObjectHeader>, Ptr<const Packet>,
+ Ptr<const CcnxFace> > m_inData; ///< @brief trace of incoming Data
+
+ TracedCallback<Ptr<const CcnxContentObjectHeader>, Ptr<const Packet>,
+ Ptr<const CcnxFace> > m_dropData; ///< @brief trace of dropped Data
+};
+
+} //namespace ns3
+
+#endif /* CCNX_FORWARDING_STRATEGY_H */