| /* -*- 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-l3-protocol.h" |
| |
| #include "ns3/packet.h" |
| #include "ns3/node.h" |
| #include "ns3/log.h" |
| #include "ns3/callback.h" |
| #include "ns3/uinteger.h" |
| #include "ns3/trace-source-accessor.h" |
| #include "ns3/object-vector.h" |
| #include "ns3/pointer.h" |
| #include "ns3/boolean.h" |
| #include "ns3/string.h" |
| #include "ns3/simulator.h" |
| |
| #include "ns3/ccnx-header-helper.h" |
| |
| #include "ccnx-face.h" |
| #include "ccnx-forwarding-strategy.h" |
| #include "ccnx-interest-header.h" |
| #include "ccnx-content-object-header.h" |
| |
| #include "ccnx-net-device-face.h" |
| |
| #include <boost/foreach.hpp> |
| #include <boost/lambda/lambda.hpp> |
| #include <boost/lambda/bind.hpp> |
| |
| using namespace boost::tuples; |
| namespace ll = boost::lambda; |
| |
| NS_LOG_COMPONENT_DEFINE ("CcnxL3Protocol"); |
| |
| namespace ns3 { |
| |
| const uint16_t CcnxL3Protocol::ETHERNET_FRAME_TYPE = 0x7777; |
| |
| |
| NS_OBJECT_ENSURE_REGISTERED (CcnxL3Protocol); |
| |
| TypeId |
| CcnxL3Protocol::GetTypeId (void) |
| { |
| static TypeId tid = TypeId ("ns3::CcnxL3Protocol") |
| .SetParent<Ccnx> () |
| .SetGroupName ("Ccnx") |
| .AddConstructor<CcnxL3Protocol> () |
| .AddAttribute ("FaceList", "List of faces associated with CCNx stack", |
| ObjectVectorValue (), |
| MakeObjectVectorAccessor (&CcnxL3Protocol::m_faces), |
| MakeObjectVectorChecker<CcnxFace> ()) |
| |
| .AddAttribute ("ForwardingStrategy", "Forwarding strategy used by CCNx stack", |
| PointerValue (), |
| MakePointerAccessor (&CcnxL3Protocol::SetForwardingStrategy, &CcnxL3Protocol::GetForwardingStrategy), |
| MakePointerChecker<CcnxForwardingStrategy> ()) |
| |
| .AddAttribute ("EnableNACKs", "Enabling support of NACKs", |
| BooleanValue (false), |
| MakeBooleanAccessor (&CcnxL3Protocol::m_nacksEnabled), |
| MakeBooleanChecker ()) |
| .AddAttribute ("CacheUnsolicitedData", "Cache overheard data that have not been requested", |
| BooleanValue (false), |
| MakeBooleanAccessor (&CcnxL3Protocol::m_cacheUnsolicitedData), |
| MakeBooleanChecker ()) |
| ; |
| return tid; |
| } |
| |
| CcnxL3Protocol::CcnxL3Protocol() |
| : m_faceCounter (0) |
| { |
| NS_LOG_FUNCTION (this); |
| |
| m_pit = CreateObject<CcnxPit> (); |
| m_contentStore = CreateObject<CcnxContentStore> (); |
| } |
| |
| CcnxL3Protocol::~CcnxL3Protocol () |
| { |
| NS_LOG_FUNCTION (this); |
| } |
| |
| void |
| CcnxL3Protocol::SetNode (Ptr<Node> node) |
| { |
| m_node = node; |
| m_fib = m_node->GetObject<CcnxFib> (); |
| NS_ASSERT_MSG (m_fib != 0, "FIB should be created and aggregated to a node before calling Ccnx::SetNode"); |
| |
| m_pit->SetFib (m_fib); |
| } |
| |
| /* |
| * This method is called by AddAgregate and completes the aggregation |
| * by setting the node in the ccnx stack |
| */ |
| void |
| CcnxL3Protocol::NotifyNewAggregate () |
| { |
| if (m_node == 0) |
| { |
| Ptr<Node>node = this->GetObject<Node>(); |
| // verify that it's a valid node and that |
| // the node has not been set before |
| if (node != 0) |
| { |
| this->SetNode (node); |
| } |
| } |
| Object::NotifyNewAggregate (); |
| } |
| |
| void |
| CcnxL3Protocol::DoDispose (void) |
| { |
| NS_LOG_FUNCTION (this); |
| |
| for (CcnxFaceList::iterator i = m_faces.begin (); i != m_faces.end (); ++i) |
| { |
| *i = 0; |
| } |
| m_faces.clear (); |
| m_node = 0; |
| |
| // Force delete on objects |
| m_forwardingStrategy = 0; // there is a reference to PIT stored in here |
| m_pit = 0; |
| m_contentStore = 0; |
| m_fib = 0; |
| |
| // m_forwardingStrategy = 0; |
| Object::DoDispose (); |
| } |
| |
| void |
| CcnxL3Protocol::SetForwardingStrategy (Ptr<CcnxForwardingStrategy> forwardingStrategy) |
| { |
| NS_LOG_FUNCTION (this); |
| m_forwardingStrategy = forwardingStrategy; |
| m_forwardingStrategy->SetPit (m_pit); |
| } |
| |
| Ptr<CcnxForwardingStrategy> |
| CcnxL3Protocol::GetForwardingStrategy (void) const |
| { |
| return m_forwardingStrategy; |
| } |
| |
| uint32_t |
| CcnxL3Protocol::AddFace (const Ptr<CcnxFace> &face) |
| { |
| NS_LOG_FUNCTION (this << &face); |
| |
| face->SetId (m_faceCounter); // sets a unique ID of the face. This ID serves only informational purposes |
| |
| // ask face to register in lower-layer stack |
| face->RegisterProtocolHandler (MakeCallback (&CcnxL3Protocol::Receive, this)); |
| |
| m_faces.push_back (face); |
| m_faceCounter++; |
| return face->GetId (); |
| } |
| |
| void |
| CcnxL3Protocol::RemoveFace (Ptr<CcnxFace> face) |
| { |
| // ask face to register in lower-layer stack |
| face->RegisterProtocolHandler (MakeNullCallback<void,const Ptr<CcnxFace>&,const Ptr<const Packet>&> ()); |
| |
| // just to be on a safe side. Do the process in two steps |
| std::list<boost::reference_wrapper<const CcnxPitEntry> > entriesToRemoves; |
| BOOST_FOREACH (const CcnxPitEntry &pitEntry, *m_pit) |
| { |
| m_pit->modify (m_pit->iterator_to (pitEntry), |
| ll::bind (&CcnxPitEntry::RemoveAllReferencesToFace, ll::_1, face)); |
| |
| // If this face is the only for the associated FIB entry, then FIB entry will be removed soon. |
| // Thus, we have to remove the whole PIT entry |
| if (pitEntry.m_fibEntry.m_faces.size () == 1 && |
| pitEntry.m_fibEntry.m_faces.begin ()->m_face == face) |
| { |
| entriesToRemoves.push_back (boost::cref (pitEntry)); |
| } |
| } |
| BOOST_FOREACH (const CcnxPitEntry &removedEntry, entriesToRemoves) |
| { |
| m_pit->erase (m_pit->iterator_to (removedEntry)); |
| } |
| |
| CcnxFaceList::iterator face_it = find (m_faces.begin(), m_faces.end(), face); |
| NS_ASSERT_MSG (face_it != m_faces.end (), "Attempt to remove face that doesn't exist"); |
| m_faces.erase (face_it); |
| } |
| |
| Ptr<CcnxFace> |
| CcnxL3Protocol::GetFace (uint32_t index) const |
| { |
| BOOST_FOREACH (const Ptr<CcnxFace> &face, m_faces) // this function is not supposed to be called often, so linear search is fine |
| { |
| if (face->GetId () == index) |
| return face; |
| } |
| return 0; |
| } |
| |
| Ptr<CcnxFace> |
| CcnxL3Protocol::GetFaceByNetDevice (Ptr<NetDevice> netDevice) const |
| { |
| BOOST_FOREACH (const Ptr<CcnxFace> &face, m_faces) // this function is not supposed to be called often, so linear search is fine |
| { |
| Ptr<CcnxNetDeviceFace> netDeviceFace = DynamicCast<CcnxNetDeviceFace> (face); |
| if (netDeviceFace == 0) continue; |
| |
| if (netDeviceFace->GetNetDevice () == netDevice) |
| return face; |
| } |
| return 0; |
| } |
| |
| uint32_t |
| CcnxL3Protocol::GetNFaces (void) const |
| { |
| return m_faces.size (); |
| } |
| |
| // Callback from lower layer |
| void |
| CcnxL3Protocol::Receive (const Ptr<CcnxFace> &face, const Ptr<const Packet> &p) |
| { |
| NS_LOG_LOGIC ("Packet from face " << *face << " received on node " << m_node->GetId ()); |
| |
| Ptr<Packet> packet = p->Copy (); // give upper layers a rw copy of the packet |
| try |
| { |
| CcnxHeaderHelper::Type type = CcnxHeaderHelper::GetCcnxHeaderType (p); |
| switch (type) |
| { |
| case CcnxHeaderHelper::INTEREST: |
| { |
| Ptr<CcnxInterestHeader> header = Create<CcnxInterestHeader> (); |
| |
| // Deserialization. Exception may be thrown |
| packet->RemoveHeader (*header); |
| NS_ASSERT_MSG (packet->GetSize () == 0, "Payload of Interests should be zero"); |
| |
| if (header->GetNack () > 0) |
| OnNack (face, header, p/*original packet*/); |
| else |
| OnInterest (face, header, p/*original packet*/); |
| break; |
| } |
| case CcnxHeaderHelper::CONTENT_OBJECT: |
| { |
| Ptr<CcnxContentObjectHeader> header = Create<CcnxContentObjectHeader> (); |
| |
| static CcnxContentObjectTail contentObjectTrailer; //there is no data in this object |
| |
| // Deserialization. Exception may be thrown |
| packet->RemoveHeader (*header); |
| packet->RemoveTrailer (contentObjectTrailer); |
| |
| OnData (face, header, packet/*payload*/, p/*original packet*/); |
| break; |
| } |
| } |
| |
| // exception will be thrown if packet is not recognized |
| } |
| catch (CcnxUnknownHeaderException) |
| { |
| NS_ASSERT_MSG (false, "Unknown CCNx header. Should not happen"); |
| } |
| } |
| |
| void |
| CcnxL3Protocol::OnNack (const Ptr<CcnxFace> &incomingFace, |
| Ptr<CcnxInterestHeader> &header, |
| const Ptr<const Packet> &packet) |
| { |
| NS_LOG_FUNCTION (incomingFace << header << packet); |
| m_inNacks (header, incomingFace); |
| |
| tuple<const CcnxPitEntry&,bool,bool> ret = m_pit->Lookup (*header); |
| CcnxPitEntry const& pitEntry = ret.get<0> (); |
| bool isNew = ret.get<1> (); |
| bool isDuplicated = ret.get<2> (); |
| |
| if (isNew || !isDuplicated) // potential flow |
| { |
| // somebody is doing something bad |
| m_dropNacks (header, NON_DUPLICATED, incomingFace); |
| return; |
| } |
| |
| // CcnxPitEntryIncomingFaceContainer::type::iterator inFace = pitEntry.m_incoming.find (incomingFace); |
| CcnxPitEntryOutgoingFaceContainer::type::iterator outFace = pitEntry.m_outgoing.find (incomingFace); |
| |
| if (outFace == pitEntry.m_outgoing.end ()) |
| { |
| // NS_ASSERT_MSG (false, |
| // "Node " << GetObject<Node> ()->GetId () << ", outgoing entry should exist for face " << boost::cref(*incomingFace) << "\n" << |
| // "size: " << pitEntry.m_outgoing.size ()); |
| |
| // m_dropNacks (header, NON_DUPLICATE, incomingFace); |
| return; |
| } |
| |
| // This was done in error. Never, never do anything, except normal leakage. This way we ensure that we will not have losses, |
| // at least when there is only one client |
| // |
| // incomingFace->LeakBucketByOnePacket (); |
| |
| NS_LOG_ERROR ("Nack on " << boost::cref(*incomingFace)); |
| |
| m_pit->modify (m_pit->iterator_to (pitEntry), |
| ll::bind (&CcnxPitEntry::SetWaitingInVain, ll::_1, outFace)); |
| |
| // If NACK is NACK_GIVEUP_PIT, then neighbor gave up trying to and removed it's PIT entry. |
| // So, if we had an incoming entry to this neighbor, then we can remove it now |
| |
| if (header->GetNack () == CcnxInterestHeader::NACK_GIVEUP_PIT) |
| { |
| m_pit->modify (m_pit->iterator_to (pitEntry), |
| ll::bind (&CcnxPitEntry::RemoveIncoming, ll::_1, incomingFace)); |
| } |
| |
| m_fib->m_fib.modify (m_fib->m_fib.iterator_to (pitEntry.m_fibEntry), |
| ll::bind (&CcnxFibEntry::UpdateStatus, |
| ll::_1, incomingFace, CcnxFibFaceMetric::NDN_FIB_YELLOW)); |
| |
| if (pitEntry.m_incoming.size () == 0) // interest was actually satisfied |
| { |
| // no need to do anything |
| m_dropNacks (header, AFTER_SATISFIED, incomingFace); |
| return; |
| } |
| |
| if (!pitEntry.AreAllOutgoingInVain ()) // not all ougtoing are in vain |
| { |
| NS_LOG_DEBUG ("Not all outgoing are in vain"); |
| // suppress |
| // Don't do anything, we are still expecting data from some other face |
| m_dropNacks (header, SUPPRESSED, incomingFace); |
| return; |
| } |
| |
| NS_ASSERT_MSG (m_forwardingStrategy != 0, "Need a forwarding protocol object to process packets"); |
| |
| Ptr<Packet> nonNackInterest = Create<Packet> (); |
| header->SetNack (CcnxInterestHeader::NORMAL_INTEREST); |
| nonNackInterest->AddHeader (*header); |
| |
| bool propagated = m_forwardingStrategy-> |
| PropagateInterest (pitEntry, incomingFace, header, nonNackInterest); |
| |
| // // 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) |
| { |
| m_dropNacks (header, NO_FACES, incomingFace); // this headers doesn't have NACK flag set |
| GiveUpInterest (pitEntry, header); |
| } |
| } |
| |
| // Processing Interests |
| // |
| // !!! Key point. |
| // !!! All interests should be answerred!!! Either later with data, immediately with data, or immediately with NACK |
| void CcnxL3Protocol::OnInterest (const Ptr<CcnxFace> &incomingFace, |
| Ptr<CcnxInterestHeader> &header, |
| const Ptr<const Packet> &packet) |
| { |
| NS_LOG_FUNCTION (incomingFace << header << packet); |
| m_inInterests (header, incomingFace); |
| |
| // Lookup of Pit (and associated Fib) entry for this Interest |
| tuple<const CcnxPitEntry&,bool,bool> ret = m_pit->Lookup (*header); |
| CcnxPitEntry const& pitEntry = ret.get<0> (); |
| // bool isNew = ret.get<1> (); |
| bool isDuplicated = ret.get<2> (); |
| |
| // NS_LOG_DEBUG ("isNew: " << isNew << ", isDup: " << isDuplicated); |
| |
| if (isDuplicated) |
| { |
| m_dropInterests (header, DUPLICATED, 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 |
| tie (contentObject, contentObjectHeader, payload) = m_contentStore->Lookup (header); |
| if (contentObject != 0) |
| { |
| NS_ASSERT (contentObjectHeader != 0); |
| |
| NS_LOG_LOGIC("Found in cache"); |
| |
| incomingFace->Send (contentObject); |
| m_outData (contentObjectHeader, payload, true, incomingFace); |
| |
| // Set pruning timout on PIT entry (instead of deleting the record) |
| m_pit->modify (m_pit->iterator_to (pitEntry), |
| bind (&CcnxPitEntry::SetExpireTime, ll::_1, |
| Simulator::Now () + m_pit->GetPitEntryPruningTimeout ())); |
| |
| return; |
| } |
| |
| // \todo Detect retransmissions. Not yet sure how... |
| |
| // Data is not in cache |
| CcnxPitEntryIncomingFaceContainer::type::iterator inFace = pitEntry.m_incoming.find (incomingFace); |
| CcnxPitEntryOutgoingFaceContainer::type::iterator outFace = pitEntry.m_outgoing.find (incomingFace); |
| |
| bool isRetransmitted = false; |
| |
| if (inFace != pitEntry.m_incoming.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 |
| { |
| m_pit->modify (m_pit->iterator_to (pitEntry), |
| ll::var(inFace) = ll::bind (&CcnxPitEntry::AddIncoming, ll::_1, incomingFace)); |
| } |
| |
| NS_LOG_DEBUG ("IsRetx: " << isRetransmitted); |
| |
| // update PIT entry lifetime |
| m_pit->modify (m_pit->iterator_to (pitEntry), |
| ll::bind (&CcnxPitEntry::UpdateLifetime, ll::_1, |
| header->GetInterestLifetime ())); |
| |
| if (outFace != pitEntry.m_outgoing.end ()) |
| { |
| // 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 ?? ... |
| |
| m_fib->m_fib.modify(m_fib->m_fib.iterator_to (pitEntry.m_fibEntry), |
| ll::bind (&CcnxFibEntry::UpdateStatus, |
| ll::_1, incomingFace, CcnxFibFaceMetric::NDN_FIB_YELLOW)); |
| } |
| |
| if (!isRetransmitted && |
| pitEntry.AreTherePromisingOutgoingFacesExcept (incomingFace)) |
| { // Suppress this interest if we're still expecting data from some other face |
| |
| m_dropInterests (header, SUPPRESSED, incomingFace); |
| return; |
| } |
| |
| ///////////////////////////////////////////////////////////////////// |
| // Propagate |
| ///////////////////////////////////////////////////////////////////// |
| |
| NS_ASSERT_MSG (m_forwardingStrategy != 0, "Need a forwarding protocol object to process packets"); |
| |
| bool propagated = m_forwardingStrategy-> |
| PropagateInterest (pitEntry, incomingFace, header, packet); |
| |
| if (isRetransmitted) //give another chance if retransmitted |
| { |
| // increase max number of allowed retransmissions |
| m_pit->modify (m_pit->iterator_to (pitEntry), |
| ll::bind (&CcnxPitEntry::IncreaseAllowedRetxCount, ll::_1)); |
| |
| // try again |
| propagated = m_forwardingStrategy-> |
| 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, NO_FACES, incomingFace); |
| GiveUpInterest (pitEntry, header); |
| } |
| } |
| |
| // Processing ContentObjects |
| void |
| CcnxL3Protocol::OnData (const Ptr<CcnxFace> &incomingFace, |
| Ptr<CcnxContentObjectHeader> &header, |
| Ptr<Packet> &payload, |
| const Ptr<const Packet> &packet) |
| { |
| |
| NS_LOG_FUNCTION (incomingFace << header << payload << packet); |
| m_inData (header, payload, incomingFace); |
| |
| // 1. Lookup PIT entry |
| try |
| { |
| const CcnxPitEntry &pitEntry = m_pit->Lookup (*header); |
| |
| // Note that with MultiIndex we need to modify entries indirectly |
| |
| CcnxPitEntryOutgoingFaceContainer::type::iterator out = pitEntry.m_outgoing.find (incomingFace); |
| |
| // If we have sent interest for this data via this face, then update stats. |
| if (out != pitEntry.m_outgoing.end ()) |
| { |
| m_fib->m_fib.modify (m_fib->m_fib.iterator_to (pitEntry.m_fibEntry), |
| 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 ("Node "<< m_node->GetId() << |
| ". 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 |
| m_fib->m_fib.modify (m_fib->m_fib.iterator_to (pitEntry.m_fibEntry), |
| ll::bind (&CcnxFibEntry::UpdateStatus, ll::_1, |
| incomingFace, CcnxFibFaceMetric::NDN_FIB_GREEN)); |
| |
| // Add or update entry in the content store |
| m_contentStore->Add (header, payload); |
| |
| //satisfy all pending incoming Interests |
| BOOST_FOREACH (const CcnxPitEntryIncomingFace &incoming, pitEntry.m_incoming) |
| { |
| if (incoming.m_face != incomingFace) |
| { |
| incoming.m_face->Send (packet->Copy ()); |
| m_outData (header, payload, false, incoming.m_face); |
| } |
| |
| // successfull forwarded data trace |
| } |
| // All incoming interests are satisfied. Remove them |
| m_pit->modify (m_pit->iterator_to (pitEntry), |
| ll::bind (&CcnxPitEntry::ClearIncoming, ll::_1)); |
| |
| // Set pruning timout on PIT entry (instead of deleting the record) |
| m_pit->modify (m_pit->iterator_to (pitEntry), |
| ll::bind (&CcnxPitEntry::SetExpireTime, ll::_1, |
| Simulator::Now () + m_pit->GetPitEntryPruningTimeout ())); |
| } |
| catch (CcnxPitEntryNotFound) |
| { |
| 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, UNSOLICITED, incomingFace); |
| } |
| return; // do not process unsoliced data packets |
| } |
| } |
| |
| void |
| CcnxL3Protocol::GiveUpInterest (const CcnxPitEntry &pitEntry, |
| Ptr<CcnxInterestHeader> header) |
| { |
| NS_LOG_FUNCTION (this << &pitEntry); |
| if (m_nacksEnabled) |
| { |
| Ptr<Packet> packet = Create<Packet> (); |
| header->SetNack (CcnxInterestHeader::NACK_GIVEUP_PIT); |
| packet->AddHeader (*header); |
| |
| BOOST_FOREACH (const CcnxPitEntryIncomingFace &incoming, pitEntry.m_incoming) |
| { |
| 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 |
| m_pit->modify (m_pit->iterator_to (pitEntry), |
| ll::bind (&CcnxPitEntry::ClearIncoming, ll::_1)); |
| |
| // Remove also outgoing |
| m_pit->modify (m_pit->iterator_to (pitEntry), |
| ll::bind (&CcnxPitEntry::ClearOutgoing, ll::_1)); |
| |
| // Set pruning timout on PIT entry (instead of deleting the record) |
| m_pit->modify (m_pit->iterator_to (pitEntry), |
| ll::bind (&CcnxPitEntry::SetExpireTime, ll::_1, |
| Simulator::Now () + m_pit->GetPitEntryPruningTimeout ())); |
| } |
| |
| } //namespace ns3 |