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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2011 UCLA
*
* 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>
*/
#include "ndn-global-routing-helper.h"
#include "ns3/ndn-l3-protocol.h"
#include "../model/ndn-net-device-face.h"
#include "../model/ndn-global-router.h"
#include "ns3/ndn-name-components.h"
#include "ns3/ndn-fib.h"
#include "ns3/node.h"
#include "ns3/node-container.h"
#include "ns3/net-device.h"
#include "ns3/channel.h"
#include "ns3/log.h"
#include "ns3/assert.h"
#include "ns3/names.h"
#include "ns3/node-list.h"
#include "ns3/channel-list.h"
#include "ns3/object-factory.h"
#include <boost/lexical_cast.hpp>
#include <boost/foreach.hpp>
#include <boost/concept/assert.hpp>
// #include <boost/graph/graph_concepts.hpp>
// #include <boost/graph/adjacency_list.hpp>
#include <boost/graph/dijkstra_shortest_paths.hpp>
#include "boost-graph-ndn-global-routing-helper.h"
#include <math.h>
NS_LOG_COMPONENT_DEFINE ("ndn.GlobalRoutingHelper");
using namespace std;
using namespace boost;
namespace ns3 {
namespace ndn {
void
GlobalRoutingHelper::Install (Ptr<Node> node)
{
NS_LOG_LOGIC ("Node: " << node->GetId ());
Ptr<L3Protocol> ndn = node->GetObject<L3Protocol> ();
NS_ASSERT_MSG (ndn != 0, "Cannot install GlobalRoutingHelper before Ndn is installed on a node");
Ptr<GlobalRouter> gr = node->GetObject<GlobalRouter> ();
if (gr != 0)
{
NS_LOG_DEBUG ("GlobalRouter is already installed: " << gr);
return; // already installed
}
gr = CreateObject<GlobalRouter> ();
node->AggregateObject (gr);
for (uint32_t faceId = 0; faceId < ndn->GetNFaces (); faceId++)
{
Ptr<NetDeviceFace> face = DynamicCast<NetDeviceFace> (ndn->GetFace (faceId));
if (face == 0)
{
NS_LOG_DEBUG ("Skipping non-netdevice face");
continue;
}
Ptr<NetDevice> nd = face->GetNetDevice ();
if (nd == 0)
{
NS_LOG_DEBUG ("Not a NetDevice associated with NetDeviceFace");
continue;
}
Ptr<Channel> ch = nd->GetChannel ();
if (ch == 0)
{
NS_LOG_DEBUG ("Channel is not associated with NetDevice");
continue;
}
if (ch->GetNDevices () == 2) // e.g., point-to-point channel
{
for (uint32_t deviceId = 0; deviceId < ch->GetNDevices (); deviceId ++)
{
Ptr<NetDevice> otherSide = ch->GetDevice (deviceId);
if (nd == otherSide) continue;
Ptr<Node> otherNode = otherSide->GetNode ();
NS_ASSERT (otherNode != 0);
Ptr<GlobalRouter> otherGr = otherNode->GetObject<GlobalRouter> ();
if (otherGr == 0)
{
Install (otherNode);
}
otherGr = otherNode->GetObject<GlobalRouter> ();
NS_ASSERT (otherGr != 0);
gr->AddIncidency (face, otherGr);
}
}
else
{
Ptr<GlobalRouter> grChannel = ch->GetObject<GlobalRouter> ();
if (grChannel == 0)
{
Install (ch);
}
grChannel = ch->GetObject<GlobalRouter> ();
gr->AddIncidency (0, grChannel);
}
}
}
void
GlobalRoutingHelper::Install (Ptr<Channel> channel)
{
NS_LOG_LOGIC ("Channel: " << channel->GetId ());
Ptr<GlobalRouter> gr = channel->GetObject<GlobalRouter> ();
if (gr != 0)
return;
gr = CreateObject<GlobalRouter> ();
channel->AggregateObject (gr);
for (uint32_t deviceId = 0; deviceId < channel->GetNDevices (); deviceId ++)
{
Ptr<NetDevice> dev = channel->GetDevice (deviceId);
Ptr<Node> node = dev->GetNode ();
NS_ASSERT (node != 0);
Ptr<GlobalRouter> grOther = node->GetObject<GlobalRouter> ();
if (grOther == 0)
{
Install (node);
}
grOther = node->GetObject<GlobalRouter> ();
NS_ASSERT (grOther != 0);
gr->AddIncidency (0, grOther);
}
}
void
GlobalRoutingHelper::Install (const NodeContainer &nodes)
{
for (NodeContainer::Iterator node = nodes.Begin ();
node != nodes.End ();
node ++)
{
Install (*node);
}
}
void
GlobalRoutingHelper::InstallAll ()
{
Install (NodeContainer::GetGlobal ());
}
void
GlobalRoutingHelper::AddOrigin (const std::string &prefix, Ptr<Node> node)
{
Ptr<GlobalRouter> gr = node->GetObject<GlobalRouter> ();
NS_ASSERT_MSG (gr != 0,
"GlobalRouter is not installed on the node");
Ptr<NameComponents> name = Create<NameComponents> (boost::lexical_cast<NameComponents> (prefix));
gr->AddLocalPrefix (name);
}
void
GlobalRoutingHelper::AddOrigins (const std::string &prefix, const NodeContainer &nodes)
{
for (NodeContainer::Iterator node = nodes.Begin ();
node != nodes.End ();
node++)
{
AddOrigin (prefix, *node);
}
}
void
GlobalRoutingHelper::AddOrigin (const std::string &prefix, const std::string &nodeName)
{
Ptr<Node> node = Names::Find<Node> (nodeName);
NS_ASSERT_MSG (node != 0, nodeName << "is not a Node");
AddOrigin (prefix, node);
}
void
GlobalRoutingHelper::AddOriginsForAll ()
{
for (NodeList::Iterator node = NodeList::Begin (); node != NodeList::End (); node ++)
{
Ptr<GlobalRouter> gr = (*node)->GetObject<GlobalRouter> ();
string name = Names::FindName (*node);
if (gr != 0 && !name.empty ())
{
AddOrigin ("/"+name, *node);
}
}
}
void
GlobalRoutingHelper::CalculateRoutes ()
{
/**
* Implementation of route calculation is heavily based on Boost Graph Library
* See http://www.boost.org/doc/libs/1_49_0/libs/graph/doc/table_of_contents.html for more details
*/
BOOST_CONCEPT_ASSERT(( VertexListGraphConcept< NdnGlobalRouterGraph > ));
BOOST_CONCEPT_ASSERT(( IncidenceGraphConcept< NdnGlobalRouterGraph > ));
NdnGlobalRouterGraph graph;
typedef graph_traits < NdnGlobalRouterGraph >::vertex_descriptor vertex_descriptor;
// For now we doing Dijkstra for every node. Can be replaced with Bellman-Ford or Floyd-Warshall.
// Other algorithms should be faster, but they need additional EdgeListGraph concept provided by the graph, which
// is not obviously how implement in an efficient manner
for (NodeList::Iterator node = NodeList::Begin (); node != NodeList::End (); node++)
{
Ptr<GlobalRouter> source = (*node)->GetObject<GlobalRouter> ();
if (source == 0)
{
NS_LOG_DEBUG ("Node " << (*node)->GetId () << " does not export GlobalRouter interface");
continue;
}
DistancesMap distances;
dijkstra_shortest_paths (graph, source,
// predecessor_map (boost::ref(predecessors))
// .
distance_map (boost::ref(distances))
.
distance_inf (WeightInf)
.
distance_zero (WeightZero)
.
distance_compare (boost::WeightCompare ())
.
distance_combine (boost::WeightCombine ())
);
// NS_LOG_DEBUG (predecessors.size () << ", " << distances.size ());
Ptr<Fib> fib = source->GetObject<Fib> ();
fib->InvalidateAll ();
NS_ASSERT (fib != 0);
NS_LOG_DEBUG ("Reachability from Node: " << source->GetObject<Node> ()->GetId ());
for (DistancesMap::iterator i = distances.begin ();
i != distances.end ();
i++)
{
if (i->first == source)
continue;
else
{
// cout << " Node " << i->first->GetObject<Node> ()->GetId ();
if (i->second.get<0> () == 0)
{
// cout << " is unreachable" << endl;
}
else
{
BOOST_FOREACH (const Ptr<const NameComponents> &prefix, i->first->GetLocalPrefixes ())
{
NS_LOG_DEBUG (" prefix " << prefix << " reachable via face " << *i->second.get<0> ()
<< " with distance " << i->second.get<1> ()
<< " with delay " << i->second.get<2> ());
Ptr<fib::Entry> entry = fib->Add (prefix, i->second.get<0> (), i->second.get<1> ());
entry->SetRealDelayToProducer (i->second.get<0> (), Seconds (i->second.get<2> ()));
Ptr<Limits> faceLimits = i->second.get<0> ()->GetObject<Limits> ();
Ptr<Limits> fibLimits = entry->GetObject<Limits> ();
if (fibLimits != 0)
{
// if it was created by the forwarding strategy via DidAddFibEntry event
fibLimits->SetLimits (faceLimits->GetMaxRate (), 2 * i->second.get<2> () /*exact RTT*/);
NS_LOG_DEBUG ("Set limit for prefix " << *prefix << " " << faceLimits->GetMaxRate () << " / " <<
2*i->second.get<2> () << "s (" << faceLimits->GetMaxRate () * 2 * i->second.get<2> () << ")");
}
}
}
}
}
}
}
void
GlobalRoutingHelper::CalculateAllPossibleRoutes ()
{
/**
* Implementation of route calculation is heavily based on Boost Graph Library
* See http://www.boost.org/doc/libs/1_49_0/libs/graph/doc/table_of_contents.html for more details
*/
int counter = 0;
BOOST_CONCEPT_ASSERT(( VertexListGraphConcept< NdnGlobalRouterGraph > ));
BOOST_CONCEPT_ASSERT(( IncidenceGraphConcept< NdnGlobalRouterGraph > ));
NdnGlobalRouterGraph graph;
typedef graph_traits < NdnGlobalRouterGraph >::vertex_descriptor vertex_descriptor;
// For now we doing Dijkstra for every node. Can be replaced with Bellman-Ford or Floyd-Warshall.
// Other algorithms should be faster, but they need additional EdgeListGraph concept provided by the graph, which
// is not obviously how implement in an efficient manner
for (NodeList::Iterator node = NodeList::Begin (); node != NodeList::End (); node++)
{
Ptr<GlobalRouter> source = (*node)->GetObject<GlobalRouter> ();
if (source == 0)
{
NS_LOG_DEBUG ("Node " << (*node)->GetId () << " does not export GlobalRouter interface");
continue;
}
Ptr<Fib> fib = source->GetObject<Fib> ();
fib->InvalidateAll ();
NS_ASSERT (fib != 0);
NS_LOG_DEBUG ("===========");
NS_LOG_DEBUG ("Reachability from Node: " << source->GetObject<Node> ()->GetId () << " (" << Names::FindName (source->GetObject<Node> ()) << ")");
Ptr<L3Protocol> l3 = source->GetObject<L3Protocol> ();
NS_ASSERT (l3 != 0);
// remember interface statuses
std::vector<uint16_t> originalMetric (l3->GetNFaces ());
for (uint32_t faceId = 0; faceId < l3->GetNFaces (); faceId++)
{
originalMetric[faceId] = l3->GetFace (faceId)->GetMetric ();
l3->GetFace (faceId)->SetMetric (std::numeric_limits<int16_t>::max ()-1); // value std::numeric_limits<int16_t>::max () MUST NOT be used (reserved)
}
for (uint32_t enabledFaceId = 0; enabledFaceId < l3->GetNFaces (); enabledFaceId++)
{
if (DynamicCast<ndn::NetDeviceFace> (l3->GetFace (enabledFaceId)) == 0)
continue;
// enabling only faceId
l3->GetFace (enabledFaceId)->SetMetric (originalMetric[enabledFaceId]);
DistancesMap distances;
NS_LOG_DEBUG ("-----------");
dijkstra_shortest_paths (graph, source,
// predecessor_map (boost::ref(predecessors))
// .
distance_map (boost::ref(distances))
.
distance_inf (WeightInf)
.
distance_zero (WeightZero)
.
distance_compare (boost::WeightCompare ())
.
distance_combine (boost::WeightCombine ())
);
// NS_LOG_DEBUG (predecessors.size () << ", " << distances.size ());
for (DistancesMap::iterator i = distances.begin ();
i != distances.end ();
i++)
{
if (i->first == source)
continue;
else
{
// cout << " Node " << i->first->GetObject<Node> ()->GetId ();
if (i->second.get<0> () == 0)
{
// cout << " is unreachable" << endl;
}
else
{
BOOST_FOREACH (const Ptr<const NameComponents> &prefix, i->first->GetLocalPrefixes ())
{
NS_LOG_DEBUG (" prefix " << *prefix << " reachable via face " << *i->second.get<0> ()
<< " with distance " << i->second.get<1> ()
<< " with delay " << i->second.get<2> ());
if (i->second.get<0> ()->GetMetric () == std::numeric_limits<uint16_t>::max ()-1)
continue;
Ptr<fib::Entry> entry = fib->Add (prefix, i->second.get<0> (), i->second.get<1> ());
entry->SetRealDelayToProducer (i->second.get<0> (), Seconds (i->second.get<2> ()));
Ptr<Limits> faceLimits = i->second.get<0> ()->GetObject<Limits> ();
Ptr<Limits> fibLimits = entry->GetObject<Limits> ();
if (fibLimits != 0)
{
// if it was created by the forwarding strategy via DidAddFibEntry event
fibLimits->SetLimits (faceLimits->GetMaxRate (), 2 * i->second.get<2> () /*exact RTT*/);
NS_LOG_DEBUG ("Set limit for prefix " << *prefix << " " << faceLimits->GetMaxRate () << " / " <<
2*i->second.get<2> () << "s (" << faceLimits->GetMaxRate () * 2 * i->second.get<2> () << ")");
}
}
}
}
}
// disabling the face again
l3->GetFace (enabledFaceId)->SetMetric (std::numeric_limits<uint16_t>::max ()-1);
}
// recover original interface statuses
for (uint32_t faceId = 0; faceId < l3->GetNFaces (); faceId++)
{
l3->GetFace (faceId)->SetMetric (originalMetric[faceId]);
}
}
}
} // namespace ndn
} // namespace ns3