Ashlesh Gawande
116 lines
4.1 KiB
C++
116 lines
4.1 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/**
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* Copyright (c) 2014-2017, Regents of the University of California,
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* Arizona Board of Regents,
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* Colorado State University,
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* University Pierre & Marie Curie, Sorbonne University,
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* Washington University in St. Louis,
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* Beijing Institute of Technology,
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* The University of Memphis.
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*
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* This file is part of NFD (Named Data Networking Forwarding Daemon).
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* See AUTHORS.md for complete list of NFD authors and contributors.
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*
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* NFD is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Foundation,
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* either version 3 of the License, or (at your option) any later version.
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*
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* NFD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* NFD, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "multicast-strategy.hpp"
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#include "algorithm.hpp"
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#include "core/logger.hpp"
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namespace nfd {
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namespace fw {
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NFD_REGISTER_STRATEGY(MulticastStrategy);
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NFD_LOG_INIT("MulticastStrategy");
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const time::milliseconds MulticastStrategy::RETX_SUPPRESSION_INITIAL(10);
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const time::milliseconds MulticastStrategy::RETX_SUPPRESSION_MAX(250);
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MulticastStrategy::MulticastStrategy(Forwarder& forwarder, const Name& name)
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: Strategy(forwarder)
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, ProcessNackTraits(this)
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, m_retxSuppression(RETX_SUPPRESSION_INITIAL,
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RetxSuppressionExponential::DEFAULT_MULTIPLIER,
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RETX_SUPPRESSION_MAX)
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{
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ParsedInstanceName parsed = parseInstanceName(name);
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if (!parsed.parameters.empty()) {
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BOOST_THROW_EXCEPTION(std::invalid_argument("MulticastStrategy does not accept parameters"));
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}
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if (parsed.version && *parsed.version != getStrategyName()[-1].toVersion()) {
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BOOST_THROW_EXCEPTION(std::invalid_argument(
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"MulticastStrategy does not support version " + std::to_string(*parsed.version)));
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}
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this->setInstanceName(makeInstanceName(name, getStrategyName()));
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}
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const Name&
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MulticastStrategy::getStrategyName()
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{
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static Name strategyName("/localhost/nfd/strategy/multicast/%FD%02");
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return strategyName;
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}
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void
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MulticastStrategy::afterReceiveInterest(const Face& inFace, const Interest& interest,
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const shared_ptr<pit::Entry>& pitEntry)
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{
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// Should the Interest be suppressed?
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RetxSuppression::Result suppressResult = m_retxSuppression.decide(inFace, interest, *pitEntry);
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switch (suppressResult) {
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case RetxSuppression::NEW:
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case RetxSuppression::FORWARD:
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break;
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case RetxSuppression::SUPPRESS:
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NFD_LOG_DEBUG(interest << " from=" << inFace.getId() << " suppressed");
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return;
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}
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const fib::Entry& fibEntry = this->lookupFib(*pitEntry);
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const fib::NextHopList& nexthops = fibEntry.getNextHops();
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int nEligibleNextHops = 0;
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for (const auto& nexthop : nexthops) {
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Face& outFace = nexthop.getFace();
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if (&outFace != &inFace && !wouldViolateScope(inFace, interest, outFace)) {
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this->sendInterest(pitEntry, outFace, interest);
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NFD_LOG_DEBUG(interest << " from=" << inFace.getId()
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<< " pitEntry-to=" << outFace.getId());
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++nEligibleNextHops;
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}
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}
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if (nEligibleNextHops == 0) {
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NFD_LOG_DEBUG(interest << " from=" << inFace.getId() << " noNextHop");
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lp::NackHeader nackHeader;
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nackHeader.setReason(lp::NackReason::NO_ROUTE);
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this->sendNack(pitEntry, inFace, nackHeader);
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this->rejectPendingInterest(pitEntry);
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}
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}
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void
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MulticastStrategy::afterReceiveNack(const Face& inFace, const lp::Nack& nack,
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const shared_ptr<pit::Entry>& pitEntry)
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{
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this->processNack(inFace, nack, pitEntry);
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}
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} // namespace fw
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} // namespace nfd
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