NS-3 based Named Data Networking (NDN) simulator
ndnSIM 2.5: NDN, CCN, CCNx, content centric networks
API Documentation
process-nack-traits.cpp
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1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2 /*
3  * Copyright (c) 2014-2019, Regents of the University of California,
4  * Arizona Board of Regents,
5  * Colorado State University,
6  * University Pierre & Marie Curie, Sorbonne University,
7  * Washington University in St. Louis,
8  * Beijing Institute of Technology,
9  * The University of Memphis.
10  *
11  * This file is part of NFD (Named Data Networking Forwarding Daemon).
12  * See AUTHORS.md for complete list of NFD authors and contributors.
13  *
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24  */
25 
26 #include "process-nack-traits.hpp"
27 #include "common/logger.hpp"
28 
29 namespace nfd {
30 namespace fw {
31 
33 
34 void
36  const shared_ptr<pit::Entry>& pitEntry)
37 {
38  int nOutRecordsNotNacked = 0;
39  Face* lastFaceNotNacked = nullptr;
40  lp::NackReason leastSevereReason = lp::NackReason::NONE;
41  for (const pit::OutRecord& outR : pitEntry->getOutRecords()) {
42  const lp::NackHeader* inNack = outR.getIncomingNack();
43  if (inNack == nullptr) {
44  ++nOutRecordsNotNacked;
45  lastFaceNotNacked = &outR.getFace();
46  continue;
47  }
48 
49  if (isLessSevere(inNack->getReason(), leastSevereReason)) {
50  leastSevereReason = inNack->getReason();
51  }
52  }
53 
54  lp::NackHeader outNack;
55  outNack.setReason(leastSevereReason);
56 
57  if (nOutRecordsNotNacked == 1) {
58  BOOST_ASSERT(lastFaceNotNacked != nullptr);
59  pit::InRecordCollection::iterator inR = pitEntry->getInRecord(*lastFaceNotNacked);
60  if (inR != pitEntry->in_end()) {
61  // one out-record not Nacked, which is also a downstream
62  NFD_LOG_DEBUG(nack.getInterest() << " nack-from=" << inFace.getId() <<
63  " nack=" << nack.getReason() <<
64  " nack-to(bidirectional)=" << lastFaceNotNacked->getId() <<
65  " out-nack=" << outNack.getReason());
66  this->sendNackForProcessNackTraits(pitEntry, *lastFaceNotNacked, outNack);
67  return;
68  }
69  }
70 
71  if (nOutRecordsNotNacked > 0) {
72  NFD_LOG_DEBUG(nack.getInterest() << " nack-from=" << inFace.getId() <<
73  " nack=" << nack.getReason() <<
74  " waiting=" << nOutRecordsNotNacked);
75  // continue waiting
76  return;
77  }
78 
79  NFD_LOG_DEBUG(nack.getInterest() << " nack-from=" << inFace.getId() <<
80  " nack=" << nack.getReason() <<
81  " nack-to=all out-nack=" << outNack.getReason());
82  this->sendNacksForProcessNackTraits(pitEntry, outNack);
83 }
84 
85 } // namespace fw
86 } // namespace nfd
ndn::lp::NackHeader::setReason
NackHeader & setReason(NackReason reason)
set reason code
Definition: nack-header.cpp:135
ndn::lp::NackHeader
represents a Network NACK header
Definition: nack-header.hpp:58
nfd::pit::OutRecord
Contains information about an Interest toward an outgoing face.
Definition: pit-out-record.hpp:37
ndn::lp::NackReason
NackReason
indicates the reason type of a network NACK
Definition: nack-header.hpp:37
nfd::fw::ProcessNackTraits
Definition: process-nack-traits.hpp:71
nfd
Copyright (c) 2011-2015 Regents of the University of California.
Definition: ndn-common.hpp:40
ndn::lp::Nack::getReason
NackReason getReason() const
Definition: nack.hpp:90
nfd::face::Face
generalization of a network interface
Definition: face.hpp:53
ndn::lp::isLessSevere
bool isLessSevere(lp::NackReason x, lp::NackReason y)
compare NackReason for severity
Definition: nack-header.cpp:45
nfd::face::Face::getId
FaceId getId() const
Definition: face.hpp:214
NFD_LOG_DEBUG
#define NFD_LOG_DEBUG
Definition: logger.hpp:38
nfd::fw::ProcessNackTraitsBase::processNack
void processNack(const Face &inFace, const lp::Nack &nack, const shared_ptr< pit::Entry > &pitEntry)
Definition: process-nack-traits.cpp:35
ndn::lp::Nack
represents a Network Nack
Definition: nack.hpp:39
ndn::lp::NackHeader::getReason
NackReason getReason() const
Definition: nack-header.cpp:122
ndn::lp::NackReason::NONE
@ NONE
process-nack-traits.hpp
ndn::lp::Nack::getInterest
const Interest & getInterest() const
Definition: nack.hpp:51
NFD_LOG_INIT
#define NFD_LOG_INIT(name)
Definition: logger.hpp:31
logger.hpp