Implementing base support for TCP-style window-based limiting on per-FIB-prefix and per-face granularity
Currently, limits are supported only by ndn::fw::Limits forwarding
strategy and only at the very basic (not fully tested) level.
diff --git a/model/fw/per-fib-limits.cc b/model/fw/per-fib-limits.cc
new file mode 100644
index 0000000..77851bc
--- /dev/null
+++ b/model/fw/per-fib-limits.cc
@@ -0,0 +1,168 @@
+/* -*- 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 "per-fib-limits.h"
+
+#include "ns3/ndn-interest-header.h"
+#include "ns3/ndn-content-object-header.h"
+#include "ns3/ndn-pit.h"
+#include "ns3/ndn-pit-entry.h"
+
+#include "ns3/assert.h"
+#include "ns3/log.h"
+#include "ns3/simulator.h"
+
+#include <boost/foreach.hpp>
+#include <boost/lambda/lambda.hpp>
+#include <boost/lambda/bind.hpp>
+namespace ll = boost::lambda;
+
+NS_LOG_COMPONENT_DEFINE ("ndn.fw.PerFibLimits");
+
+namespace ns3 {
+namespace ndn {
+namespace fw {
+
+NS_OBJECT_ENSURE_REGISTERED (PerFibLimits);
+
+TypeId
+PerFibLimits::GetTypeId (void)
+{
+ static TypeId tid = TypeId ("ns3::ndn::fw::PerFibLimits")
+ .SetGroupName ("Ndn")
+ .SetParent <FwStats> ()
+ .AddConstructor <PerFibLimits> ()
+ ;
+ return tid;
+}
+
+PerFibLimits::PerFibLimits ()
+{
+}
+
+void
+PerFibLimits::DoDispose ()
+{
+ BestRoute::DoDispose ();
+ m_decayLimitsEvent.Cancel ();
+}
+
+bool
+PerFibLimits::WillSendOutInterest (const Ptr<Face> &outgoingFace,
+ Ptr<InterestHeader> header,
+ Ptr<pit::Entry> pitEntry)
+{
+ NS_LOG_FUNCTION (this << pitEntry->GetPrefix ());
+ // override all (if any) parent processing
+
+ pit::Entry::out_iterator outgoing =
+ pitEntry->GetOutgoing ().find (outgoingFace);
+
+ if (outgoing != pitEntry->GetOutgoing ().end ())
+ {
+ return false;
+ }
+
+ if (pitEntry->GetFibEntry ()->GetLimits ().IsBelowLimit ())
+ {
+ if (outgoingFace->GetLimits ()->IsBelowLimit ())
+ {
+ pitEntry->AddOutgoing (outgoingFace);
+ return true;
+ }
+ else
+ {
+ pitEntry->GetFibEntry ()->GetLimits ().RemoveOutstanding ();
+ }
+ }
+
+ return false;
+}
+
+void
+PerFibLimits::WillEraseTimedOutPendingInterest (Ptr<pit::Entry> pitEntry)
+{
+ NS_LOG_FUNCTION (this << pitEntry->GetPrefix ());
+
+ for (pit::Entry::out_container::iterator face = pitEntry->GetOutgoing ().begin ();
+ face != pitEntry->GetOutgoing ().end ();
+ face ++)
+ {
+ face->m_face->GetLimits ()->RemoveOutstanding ();
+ // face->m_face->GetLimits ()->DecreaseLimit (); !!! do not decrease per-face limit. it doesn't make sense !!!
+ }
+
+ pitEntry->GetFibEntry ()->GetLimits ().RemoveOutstanding ();
+ pitEntry->GetFibEntry ()->GetLimits ().DecreaseLimit (); // multiplicative decrease
+
+ if (!m_decayLimitsEvent.IsRunning ())
+ m_decayLimitsEvent = Simulator::Schedule (Seconds (1.0), &PerFibLimits::DecayLimits, this);
+}
+
+
+void
+PerFibLimits::WillSatisfyPendingInterest (const Ptr<Face> &incomingFace,
+ Ptr<pit::Entry> pitEntry)
+{
+ NS_LOG_FUNCTION (this << pitEntry->GetPrefix ());
+
+ super::WillSatisfyPendingInterest (incomingFace, pitEntry);
+
+ for (pit::Entry::out_container::iterator face = pitEntry->GetOutgoing ().begin ();
+ face != pitEntry->GetOutgoing ().end ();
+ face ++)
+ {
+ face->m_face->GetLimits ()->RemoveOutstanding ();
+ // face->m_face->GetLimits ()->IncreaseLimit (); !!! do not increase (as do not decrease) per-face limit. again, it doesn't make sense
+ }
+
+ pitEntry->GetFibEntry ()->GetLimits ().RemoveOutstanding ();
+ pitEntry->GetFibEntry ()->GetLimits ().IncreaseLimit (); // additive increase
+}
+
+
+// void
+// PerFibLimits::DidReceiveValidNack (const Ptr<Face> &incomingFace,
+// uint32_t nackCode,
+// Ptr<pit::Entry> pitEntry)
+// {
+// // super::DidReceiveValidNack (incomingFace, nackCode, pitEntry);
+
+// // ??
+// }
+
+void
+PerFibLimits::DecayLimits ()
+{
+ for (Ptr<fib::Entry> entry = m_fib->Begin ();
+ entry != m_fib->End ();
+ entry = m_fib->Next (entry))
+ {
+ entry->GetLimits ().DecayCurrentLimit ();
+ }
+
+ m_decayLimitsEvent = Simulator::Schedule (Seconds (1.0), &PerFibLimits::DecayLimits, this);
+}
+
+
+} // namespace fw
+} // namespace ndn
+} // namespace ns3