128 lines
4.5 KiB
C++
128 lines
4.5 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/**
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* Copyright (c) 2014, 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 "udp-face.hpp"
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#ifdef __linux__
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#include <netinet/in.h> // for IP_MTU_DISCOVER and IP_PMTUDISC_DONT
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#include <sys/socket.h> // for setsockopt()
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#endif
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namespace nfd {
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NFD_LOG_INCLASS_TEMPLATE_SPECIALIZATION_DEFINE(DatagramFace, UdpFace::protocol, "UdpFace");
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UdpFace::UdpFace(const shared_ptr<UdpFace::protocol::socket>& socket,
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bool isOnDemand,
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const time::seconds& idleTimeout)
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: DatagramFace<protocol>(FaceUri(socket->remote_endpoint()),
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FaceUri(socket->local_endpoint()),
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socket, isOnDemand)
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, m_idleTimeout(idleTimeout)
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, m_lastIdleCheck(time::steady_clock::now())
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{
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#ifdef __linux__
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//
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// By default, Linux does path MTU discovery on IPv4 sockets,
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// and sets the DF (Don't Fragment) flag on datagrams smaller
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// than the interface MTU. However this does not work for us,
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// because we cannot properly respond to ICMP "packet too big"
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// messages by fragmenting the packet at the application level,
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// since we want to rely on IP for fragmentation and reassembly.
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//
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// Therefore, we disable PMTU discovery, which prevents the kernel
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// from setting the DF flag on outgoing datagrams, and thus allows
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// routers along the path to perform fragmentation as needed.
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//
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const int value = IP_PMTUDISC_DONT;
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if (::setsockopt(socket->native_handle(), IPPROTO_IP,
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IP_MTU_DISCOVER, &value, sizeof(value)) < 0)
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{
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NFD_LOG_WARN("[id:" << this->getId()
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<< ",uri:" << this->getRemoteUri()
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<< "] Failed to disable path MTU discovery");
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}
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#endif
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if (isOnDemand && m_idleTimeout > time::seconds::zero()) {
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m_closeIfIdleEvent = scheduler::schedule(m_idleTimeout,
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bind(&UdpFace::closeIfIdle, this));
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}
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}
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UdpFace::~UdpFace()
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{
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scheduler::cancel(m_closeIfIdleEvent);
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}
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ndn::nfd::FaceStatus
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UdpFace::getFaceStatus() const
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{
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ndn::nfd::FaceStatus status = Face::getFaceStatus();
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if (isOnDemand()) {
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time::milliseconds left = m_idleTimeout - time::duration_cast<time::milliseconds>(
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time::steady_clock::now() - m_lastIdleCheck);
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if (left < time::milliseconds::zero())
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left = time::milliseconds::zero();
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if (hasBeenUsedRecently()) {
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status.setExpirationPeriod(left + m_idleTimeout);
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}
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else {
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status.setExpirationPeriod(left);
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}
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}
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return status;
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}
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void
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UdpFace::closeIfIdle()
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{
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// Face can be switched from on-demand to non-on-demand mode
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// (non-on-demand -> on-demand transition is not allowed)
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if (isOnDemand()) {
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if (!hasBeenUsedRecently()) {
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// face has been idle since the last time closeIfIdle
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// has been called. Going to close it
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NFD_LOG_DEBUG("Found idle face id: " << getId());
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NFD_LOG_INFO("[id:" << this->getId()
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<< ",uri:" << this->getRemoteUri()
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<< "] Idle for more than " << m_idleTimeout << ", closing");
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close();
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}
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else {
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resetRecentUsage();
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m_lastIdleCheck = time::steady_clock::now();
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m_closeIfIdleEvent = scheduler::schedule(m_idleTimeout,
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bind(&UdpFace::closeIfIdle, this));
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}
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}
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// else do nothing and do not reschedule the event
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}
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} // namespace nfd
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