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/* -*- 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>
*
*/
#include "ndn-face.h"
#include "ns3/packet.h"
#include "ns3/log.h"
#include "ns3/node.h"
#include "ns3/assert.h"
#include "ns3/uinteger.h"
#include "ns3/double.h"
#include "ns3/boolean.h"
#include "ns3/simulator.h"
#include "ns3/random-variable.h"
#include "ns3/pointer.h"
#include "ns3/ndn-header-helper.h"
#include "ns3/ndnSIM/utils/ndn-fw-hop-count-tag.h"
#include "ns3/ndnSIM/model/wire/ndnsim.h"
#include <boost/ref.hpp>
NS_LOG_COMPONENT_DEFINE ("ndn.Face");
namespace ns3 {
namespace ndn {
NS_OBJECT_ENSURE_REGISTERED (Face);
TypeId
Face::GetTypeId ()
{
static TypeId tid = TypeId ("ns3::ndn::Face")
.SetParent<Object> ()
.SetGroupName ("Ndn")
.AddAttribute ("Id", "Face id (unique integer for the Ndn stack on this node)",
TypeId::ATTR_GET, // allow only getting it.
UintegerValue (0),
MakeUintegerAccessor (&Face::m_id),
MakeUintegerChecker<uint32_t> ())
;
return tid;
}
/**
* By default, Ndn face are created in the "down" state
* with no IP addresses. Before becoming useable, the user must
* invoke SetUp on them once an Ndn address and mask have been set.
*/
Face::Face (Ptr<Node> node)
: m_node (node)
, m_upstreamInterestHandler (MakeNullCallback< void, Ptr<Face>, Ptr<Interest> > ())
, m_upstreamDataHandler (MakeNullCallback< void, Ptr<Face>, Ptr<ContentObject> > ())
, m_ifup (false)
, m_id ((uint32_t)-1)
, m_metric (0)
, m_flags (0)
{
NS_LOG_FUNCTION (this);
NS_ASSERT_MSG (node != 0, "node cannot be NULL. Check the code");
}
Face::~Face ()
{
NS_LOG_FUNCTION_NOARGS ();
}
Face::Face (const Face &)
{
}
Face& Face::operator= (const Face &)
{
return *this;
}
Ptr<Node>
Face::GetNode () const
{
return m_node;
}
void
Face::RegisterProtocolHandlers (const InterestHandler &interestHandler, const DataHandler &dataHandler)
{
NS_LOG_FUNCTION_NOARGS ();
m_upstreamInterestHandler = interestHandler;
m_upstreamDataHandler = dataHandler;
}
void
Face::UnRegisterProtocolHandlers ()
{
NS_LOG_FUNCTION_NOARGS ();
m_upstreamInterestHandler = MakeNullCallback< void, Ptr<Face>, Ptr<Interest> > ();
m_upstreamDataHandler = MakeNullCallback< void, Ptr<Face>, Ptr<ContentObject> > ();
}
bool
Face::SendInterest (Ptr<const Interest> interest)
{
NS_LOG_FUNCTION (this << interest);
if (!IsUp ())
{
return false;
}
Ptr<Packet> packet = wire::ndnSIM::Interest::ToWire (interest);
return Send (packet);
}
bool
Face::SendData (Ptr<const ContentObject> data)
{
NS_LOG_FUNCTION (this << data);
if (!IsUp ())
{
return false;
}
Ptr<Packet> packet = wire::ndnSIM::Data::ToWire (data);
return Send (packet);
}
bool
Face::Send (Ptr<Packet> packet)
{
FwHopCountTag hopCount;
bool tagExists = packet->RemovePacketTag (hopCount);
if (tagExists)
{
hopCount.Increment ();
packet->AddPacketTag (hopCount);
}
return true;
}
bool
Face::Receive (Ptr<const Packet> p)
{
NS_LOG_FUNCTION (this << p << p->GetSize ());
if (!IsUp ())
{
// no tracing here. If we were off while receiving, we shouldn't even know that something was there
return false;
}
Ptr<Packet> packet = p->Copy (); // give upper layers a rw copy of the packet
try
{
HeaderHelper::Type type = HeaderHelper::GetNdnHeaderType (packet);
switch (type)
{
case HeaderHelper::INTEREST_NDNSIM:
{
Ptr<Interest> interest = wire::ndnSIM::Interest::FromWire (packet);
return ReceiveInterest (interest);
}
case HeaderHelper::CONTENT_OBJECT_NDNSIM:
{
Ptr<ContentObject> data = wire::ndnSIM::Data::FromWire (packet);
return ReceiveData (data);
}
case HeaderHelper::INTEREST_CCNB:
case HeaderHelper::CONTENT_OBJECT_CCNB:
NS_FATAL_ERROR ("ccnb support is broken in this implementation");
return false;
}
// exception will be thrown if packet is not recognized
}
catch (UnknownHeaderException)
{
NS_ASSERT_MSG (false, "Unknown NDN header. Should not happen");
NS_LOG_ERROR ("Unknown NDN header. Should not happen");
return false;
}
}
bool
Face::ReceiveInterest (Ptr<Interest> interest)
{
if (!IsUp ())
{
// no tracing here. If we were off while receiving, we shouldn't even know that something was there
return false;
}
m_upstreamInterestHandler (this, interest);
return true;
}
bool
Face::ReceiveData (Ptr<ContentObject> data)
{
if (!IsUp ())
{
// no tracing here. If we were off while receiving, we shouldn't even know that something was there
return false;
}
m_upstreamDataHandler (this, data);
return true;
}
void
Face::SetMetric (uint16_t metric)
{
NS_LOG_FUNCTION (metric);
m_metric = metric;
}
uint16_t
Face::GetMetric (void) const
{
return m_metric;
}
/**
* These are face states and may be distinct from
* NetDevice states, such as found in real implementations
* (where the device may be down but face state is still up).
*/
void
Face::SetFlags (uint32_t flags)
{
m_flags = flags;
}
bool
Face::operator== (const Face &face) const
{
NS_ASSERT_MSG (m_node->GetId () == face.m_node->GetId (),
"Faces of different nodes should not be compared to each other: " << *this << " == " << face);
return (m_id == face.m_id);
}
bool
Face::operator< (const Face &face) const
{
NS_ASSERT_MSG (m_node->GetId () == face.m_node->GetId (),
"Faces of different nodes should not be compared to each other: " << *this << " == " << face);
return (m_id < face.m_id);
}
std::ostream&
Face::Print (std::ostream &os) const
{
os << "id=" << GetId ();
return os;
}
std::ostream&
operator<< (std::ostream& os, const Face &face)
{
face.Print (os);
return os;
}
} // namespace ndn
} // namespace ns3