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lsdb.cpp
564 lines (493 loc) · 20.7 KB
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lsdb.cpp
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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2014-2024, The University of Memphis,
* Regents of the University of California,
* Arizona Board of Regents.
*
* This file is part of NLSR (Named-data Link State Routing).
* See AUTHORS.md for complete list of NLSR authors and contributors.
*
* NLSR is free software: you can redistribute it and/or modify it under the terms
* of the GNU General Public License as published by the Free Software Foundation,
* either version 3 of the License, or (at your option) any later version.
*
* NLSR 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
* NLSR, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
*/
#include "lsdb.hpp"
#include "logger.hpp"
#include "nlsr.hpp"
#include "utility/name-helper.hpp"
#include <ndn-cxx/lp/tags.hpp>
namespace nlsr {
INIT_LOGGER(Lsdb);
Lsdb::Lsdb(ndn::Face& face, ndn::KeyChain& keyChain, ConfParameter& confParam)
: m_face(face)
, m_scheduler(face.getIoContext())
, m_confParam(confParam)
, m_sync(m_face, keyChain,
[this] (const auto& routerName, Lsa::Type lsaType, uint64_t seqNo, uint64_t) {
return isLsaNew(routerName, lsaType, seqNo);
},
SyncLogicOptions{
confParam.getSyncProtocol(),
confParam.getSyncPrefix(),
confParam.getSyncUserPrefix(),
confParam.getSyncInterestLifetime(),
confParam.getRouterPrefix(),
confParam.getHyperbolicState()
})
, m_lsaRefreshTime(ndn::time::seconds(m_confParam.getLsaRefreshTime()))
, m_adjLsaBuildInterval(m_confParam.getAdjLsaBuildInterval())
, m_thisRouterPrefix(m_confParam.getRouterPrefix())
, m_sequencingManager(m_confParam.getStateFileDir(), m_confParam.getHyperbolicState())
, m_onNewLsaConnection(m_sync.onNewLsa.connect(
[this] (const ndn::Name& updateName, uint64_t sequenceNumber,
const ndn::Name& originRouter, uint64_t incomingFaceId) {
ndn::Name lsaInterest{updateName};
lsaInterest.appendNumber(sequenceNumber);
expressInterest(lsaInterest, 0, incomingFaceId);
}))
, m_segmenter(keyChain, m_confParam.getSigningInfo())
, m_segmentFifo(100)
, m_isBuildAdjLsaScheduled(false)
, m_adjBuildCount(0)
{
ndn::Name name = m_confParam.getLsaPrefix();
NLSR_LOG_DEBUG("Setting interest filter for LsaPrefix: " << name);
m_face.setInterestFilter(ndn::InterestFilter(name).allowLoopback(false),
[this] (const auto& name, const auto& interest) { processInterest(name, interest); },
[] (const auto& name) { NLSR_LOG_DEBUG("Successfully registered prefix: " << name); },
[] (const auto& name, const auto& reason) {
NLSR_LOG_ERROR("Failed to register prefix " << name);
NDN_THROW(std::runtime_error("Register prefix failed: " + reason));
},
m_confParam.getSigningInfo(), ndn::nfd::ROUTE_FLAG_CAPTURE);
buildAndInstallOwnNameLsa();
// Install coordinate LSAs if using HR or dry-run HR.
if (m_confParam.getHyperbolicState() != HYPERBOLIC_STATE_OFF) {
buildAndInstallOwnCoordinateLsa();
}
}
Lsdb::~Lsdb()
{
for (const auto& fetcher : m_fetchers) {
fetcher->stop();
}
}
void
Lsdb::buildAndInstallOwnNameLsa()
{
NameLsa nameLsa(m_thisRouterPrefix, m_sequencingManager.getNameLsaSeq() + 1,
getLsaExpirationTimePoint(), m_confParam.getNamePrefixList());
m_sequencingManager.increaseNameLsaSeq();
m_sequencingManager.writeSeqNoToFile();
m_sync.publishRoutingUpdate(Lsa::Type::NAME, m_sequencingManager.getNameLsaSeq());
installLsa(std::make_shared<NameLsa>(nameLsa));
}
void
Lsdb::buildAndInstallOwnCoordinateLsa()
{
CoordinateLsa corLsa(m_thisRouterPrefix, m_sequencingManager.getCorLsaSeq() + 1,
getLsaExpirationTimePoint(), m_confParam.getCorR(),
m_confParam.getCorTheta());
m_sequencingManager.increaseCorLsaSeq();
m_sequencingManager.writeSeqNoToFile();
// Sync coordinate LSAs if using HR or HR dry run.
if (m_confParam.getHyperbolicState() != HYPERBOLIC_STATE_OFF) {
m_sync.publishRoutingUpdate(Lsa::Type::COORDINATE, m_sequencingManager.getCorLsaSeq());
}
installLsa(std::make_shared<CoordinateLsa>(corLsa));
}
void
Lsdb::scheduleAdjLsaBuild()
{
m_adjBuildCount++;
if (m_confParam.getHyperbolicState() == HYPERBOLIC_STATE_ON) {
// Don't build adjacency LSAs in hyperbolic routing
NLSR_LOG_DEBUG("Adjacency LSA not built while in hyperbolic routing state");
return;
}
if (m_isBuildAdjLsaScheduled) {
NLSR_LOG_DEBUG("Rescheduling Adjacency LSA build in " << m_adjLsaBuildInterval);
}
else {
NLSR_LOG_DEBUG("Scheduling Adjacency LSA build in " << m_adjLsaBuildInterval);
m_isBuildAdjLsaScheduled = true;
}
m_scheduledAdjLsaBuild = m_scheduler.schedule(m_adjLsaBuildInterval, [this] { buildAdjLsa(); });
}
void
Lsdb::writeLog() const
{
for (auto type : {Lsa::Type::COORDINATE, Lsa::Type::NAME, Lsa::Type::ADJACENCY}) {
if ((type == Lsa::Type::COORDINATE &&
m_confParam.getHyperbolicState() == HYPERBOLIC_STATE_OFF) ||
(type == Lsa::Type::ADJACENCY &&
m_confParam.getHyperbolicState() == HYPERBOLIC_STATE_ON)) {
continue;
}
NLSR_LOG_DEBUG("---------------" << type << " LSDB-------------------");
auto lsaRange = m_lsdb.get<byType>().equal_range(type);
for (auto lsaIt = lsaRange.first; lsaIt != lsaRange.second; ++lsaIt) {
NLSR_LOG_DEBUG(**lsaIt);
}
}
}
void
Lsdb::processInterest(const ndn::Name& name, const ndn::Interest& interest)
{
ndn::Name interestName(interest.getName());
NLSR_LOG_DEBUG("Interest received for LSA: " << interestName);
if (interestName[-2].isVersion()) {
// Interest for particular segment
auto data = m_segmentFifo.find(interestName);
if (data) {
NLSR_LOG_TRACE("Replying from FIFO buffer");
m_face.put(*data);
return;
}
// Remove version and segment
interestName = interestName.getPrefix(-2);
NLSR_LOG_TRACE("Interest w/o segment and version: " << interestName);
}
// increment RCV_LSA_INTEREST
lsaIncrementSignal(Statistics::PacketType::RCV_LSA_INTEREST);
std::string chkString("LSA");
int32_t lsaPosition = util::getNameComponentPosition(interestName, chkString);
// Forms the name of the router that the Interest packet came from.
ndn::Name originRouter = m_confParam.getNetwork();
originRouter.append(interestName.getSubName(lsaPosition + 1,
interestName.size() - lsaPosition - 3));
// if the interest is for this router's LSA
if (originRouter == m_thisRouterPrefix && lsaPosition >= 0) {
uint64_t seqNo = interestName[-1].toNumber();
NLSR_LOG_DEBUG("LSA sequence number from interest: " << seqNo);
std::string lsaType = interestName[-2].toUri();
Lsa::Type interestedLsType;
std::istringstream(lsaType) >> interestedLsType;
if (interestedLsType == Lsa::Type::BASE) {
NLSR_LOG_WARN("Received unrecognized LSA type: " << lsaType);
return;
}
incrementInterestRcvdStats(interestedLsType);
if (processInterestForLsa(interest, originRouter, interestedLsType, seqNo)) {
lsaIncrementSignal(Statistics::PacketType::SENT_LSA_DATA);
}
}
// else the interest is for other router's LSA, serve signed data from LsaSegmentStorage
else if (auto lsaSegment = m_lsaStorage.find(interest); lsaSegment) {
NLSR_LOG_TRACE("Found data in LSA storage. Sending data for " << interest.getName());
m_face.put(*lsaSegment);
}
}
bool
Lsdb::processInterestForLsa(const ndn::Interest& interest, const ndn::Name& originRouter,
Lsa::Type lsaType, uint64_t seqNo)
{
NLSR_LOG_DEBUG(interest << " received for " << lsaType);
if (auto lsaPtr = findLsa(originRouter, lsaType); lsaPtr) {
NLSR_LOG_TRACE("Verifying SeqNo for " << lsaType << " is same as requested");
if (lsaPtr->getSeqNo() == seqNo) {
auto segments = m_segmenter.segment(lsaPtr->wireEncode(),
ndn::Name(interest.getName()).appendVersion(),
ndn::MAX_NDN_PACKET_SIZE / 2, m_lsaRefreshTime);
for (const auto& data : segments) {
m_segmentFifo.insert(*data, m_lsaRefreshTime);
m_scheduler.schedule(m_lsaRefreshTime,
[this, name = data->getName()] { m_segmentFifo.erase(name); });
}
uint64_t segNum = 0;
if (interest.getName()[-1].isSegment()) {
segNum = interest.getName()[-1].toSegment();
}
if (segNum < segments.size()) {
m_face.put(*segments[segNum]);
}
incrementDataSentStats(lsaType);
return true;
}
}
else {
NLSR_LOG_TRACE(interest << " was not found in our LSDB");
}
return false;
}
void
Lsdb::installLsa(std::shared_ptr<Lsa> lsa)
{
auto timeToExpire = m_lsaRefreshTime;
if (lsa->getOriginRouter() != m_thisRouterPrefix) {
auto duration = lsa->getExpirationTimePoint() - ndn::time::system_clock::now();
if (duration > ndn::time::seconds(0)) {
timeToExpire = ndn::time::duration_cast<ndn::time::seconds>(duration);
}
}
auto chkLsa = findLsa(lsa->getOriginRouter(), lsa->getType());
if (chkLsa == nullptr) {
NLSR_LOG_DEBUG("Adding LSA:\n" << *lsa);
m_lsdb.emplace(lsa);
onLsdbModified(lsa, LsdbUpdate::INSTALLED, {}, {});
lsa->setExpiringEventId(scheduleLsaExpiration(lsa, timeToExpire));
}
// Else this is a known name LSA, so we are updating it.
else if (chkLsa->getSeqNo() < lsa->getSeqNo()) {
NLSR_LOG_DEBUG("Updating LSA:\n" << *chkLsa);
chkLsa->setSeqNo(lsa->getSeqNo());
chkLsa->setExpirationTimePoint(lsa->getExpirationTimePoint());
auto [updated, namesToAdd, namesToRemove] = chkLsa->update(lsa);
if (updated) {
onLsdbModified(lsa, LsdbUpdate::UPDATED, namesToAdd, namesToRemove);
}
chkLsa->setExpiringEventId(scheduleLsaExpiration(chkLsa, timeToExpire));
NLSR_LOG_DEBUG("Updated LSA:\n" << *chkLsa);
}
}
void
Lsdb::removeLsa(const LsaContainer::index<Lsdb::byName>::type::iterator& lsaIt)
{
if (lsaIt != m_lsdb.end()) {
auto lsaPtr = *lsaIt;
NLSR_LOG_DEBUG("Removing LSA:\n" << *lsaPtr);
m_lsdb.erase(lsaIt);
onLsdbModified(lsaPtr, LsdbUpdate::REMOVED, {}, {});
}
}
void
Lsdb::removeLsa(const ndn::Name& router, Lsa::Type lsaType)
{
removeLsa(m_lsdb.get<byName>().find(std::make_tuple(router, lsaType)));
}
void
Lsdb::buildAdjLsa()
{
NLSR_LOG_TRACE("buildAdjLsa called");
m_isBuildAdjLsaScheduled = false;
if (m_confParam.getAdjacencyList().isAdjLsaBuildable(m_confParam.getInterestRetryNumber())) {
int adjBuildCount = m_adjBuildCount;
// Only do the adjLsa build if there's one scheduled
if (adjBuildCount > 0) {
// It only makes sense to do the adjLsa build if we have neighbors
if (m_confParam.getAdjacencyList().getNumOfActiveNeighbor() > 0) {
NLSR_LOG_DEBUG("Building and installing own Adj LSA");
buildAndInstallOwnAdjLsa();
}
// We have no active neighbors, meaning no one can route through
// us. So delete our entry in the LSDB. This prevents this
// router from refreshing the LSA, eventually causing other
// routers to delete it, too.
else {
NLSR_LOG_DEBUG("Removing own Adj LSA; no ACTIVE neighbors");
removeLsa(m_thisRouterPrefix, Lsa::Type::ADJACENCY);
}
// In the case that during building the adj LSA, the FIB has to
// wait on an Interest response, the number of scheduled adj LSA
// builds could change, so we shouldn't just set it to 0.
m_adjBuildCount = m_adjBuildCount - adjBuildCount;
}
}
// We are still waiting to know the adjacency status of some
// neighbor, so schedule a build for later (when all that has
// hopefully finished)
else {
m_isBuildAdjLsaScheduled = true;
auto schedulingTime = ndn::time::seconds(m_confParam.getInterestRetryNumber() *
m_confParam.getInterestResendTime());
m_scheduledAdjLsaBuild = m_scheduler.schedule(schedulingTime, [this] { buildAdjLsa(); });
}
}
void
Lsdb::buildAndInstallOwnAdjLsa()
{
AdjLsa adjLsa(m_thisRouterPrefix, m_sequencingManager.getAdjLsaSeq() + 1,
getLsaExpirationTimePoint(),
m_confParam.getAdjacencyList());
m_sequencingManager.increaseAdjLsaSeq();
m_sequencingManager.writeSeqNoToFile();
//Sync adjacency LSAs if link-state or dry-run HR is enabled.
if (m_confParam.getHyperbolicState() != HYPERBOLIC_STATE_ON) {
m_sync.publishRoutingUpdate(Lsa::Type::ADJACENCY, m_sequencingManager.getAdjLsaSeq());
}
installLsa(std::make_shared<AdjLsa>(adjLsa));
}
ndn::scheduler::EventId
Lsdb::scheduleLsaExpiration(std::shared_ptr<Lsa> lsa, ndn::time::seconds expTime)
{
NLSR_LOG_DEBUG("Scheduling expiration in: " << expTime + GRACE_PERIOD << " for " << lsa->getOriginRouter());
return m_scheduler.schedule(expTime + GRACE_PERIOD, [this, lsa] { expireOrRefreshLsa(lsa); });
}
void
Lsdb::expireOrRefreshLsa(std::shared_ptr<Lsa> lsa)
{
NLSR_LOG_DEBUG("ExpireOrRefreshLsa called for " << lsa->getType());
NLSR_LOG_DEBUG("OriginRouter: " << lsa->getOriginRouter() << " Seq No: " << lsa->getSeqNo());
auto lsaIt = m_lsdb.get<byName>().find(std::make_tuple(lsa->getOriginRouter(), lsa->getType()));
// If this name LSA exists in the LSDB
if (lsaIt != m_lsdb.end()) {
auto lsaPtr = *lsaIt;
NLSR_LOG_DEBUG(*lsaPtr);
NLSR_LOG_DEBUG("LSA Exists with seq no: " << lsaPtr->getSeqNo());
// If its seq no is the one we are expecting.
if (lsaPtr->getSeqNo() == lsa->getSeqNo()) {
if (lsaPtr->getOriginRouter() == m_thisRouterPrefix) {
NLSR_LOG_DEBUG("Own " << lsaPtr->getType() << " LSA, so refreshing it");
NLSR_LOG_DEBUG("Current LSA:\n" << *lsaPtr);
lsaPtr->setSeqNo(lsaPtr->getSeqNo() + 1);
m_sequencingManager.setLsaSeq(lsaPtr->getSeqNo(), lsaPtr->getType());
lsaPtr->setExpirationTimePoint(getLsaExpirationTimePoint());
NLSR_LOG_DEBUG("Updated LSA:\n" << *lsaPtr);
// schedule refreshing event again
lsaPtr->setExpiringEventId(scheduleLsaExpiration(lsaPtr, m_lsaRefreshTime));
m_sequencingManager.writeSeqNoToFile();
m_sync.publishRoutingUpdate(lsaPtr->getType(), m_sequencingManager.getLsaSeq(lsaPtr->getType()));
}
// Since we cannot refresh other router's LSAs, our only choice is to expire.
else {
NLSR_LOG_DEBUG("Other's " << lsaPtr->getType() << " LSA, so removing from LSDB");
removeLsa(lsaIt);
}
}
}
}
void
Lsdb::expressInterest(const ndn::Name& interestName, uint32_t timeoutCount, uint64_t incomingFaceId,
ndn::time::steady_clock::time_point deadline)
{
// increment SENT_LSA_INTEREST
lsaIncrementSignal(Statistics::PacketType::SENT_LSA_INTEREST);
if (deadline == DEFAULT_LSA_RETRIEVAL_DEADLINE) {
deadline = ndn::time::steady_clock::now() + ndn::time::seconds(static_cast<int>(LSA_REFRESH_TIME_MAX));
}
// The first component of the interest is the name.
ndn::Name lsaName = interestName.getSubName(0, interestName.size()-1);
// The seq no is the last
uint64_t seqNo = interestName[-1].toNumber();
// If the LSA is not found in the list currently.
if (m_highestSeqNo.find(lsaName) == m_highestSeqNo.end()) {
m_highestSeqNo[lsaName] = seqNo;
}
// If the new seq no is higher, that means the LSA is valid
else if (seqNo > m_highestSeqNo[lsaName]) {
m_highestSeqNo[lsaName] = seqNo;
}
// Otherwise, its an old/invalid LSA
else if (seqNo < m_highestSeqNo[lsaName]) {
return;
}
ndn::Interest interest(interestName);
if (incomingFaceId != 0) {
interest.setTag(std::make_shared<ndn::lp::NextHopFaceIdTag>(incomingFaceId));
}
ndn::SegmentFetcher::Options options;
options.interestLifetime = m_confParam.getLsaInterestLifetime();
options.maxTimeout = m_confParam.getLsaInterestLifetime();
NLSR_LOG_DEBUG("Fetching Data for LSA: " << interestName << " Seq number: " << seqNo);
auto fetcher = ndn::SegmentFetcher::start(m_face, interest, m_confParam.getValidator(), options);
auto it = m_fetchers.insert(fetcher).first;
fetcher->afterSegmentValidated.connect([this] (const ndn::Data& data) {
// Nlsr class subscribes to this to fetch certificates
afterSegmentValidatedSignal(data);
// If we don't do this IMS throws: std::bad_weak_ptr: bad_weak_ptr
auto lsaSegment = std::make_shared<const ndn::Data>(data);
m_lsaStorage.insert(*lsaSegment);
// Schedule deletion of the segment
m_scheduler.schedule(ndn::time::seconds(LSA_REFRESH_TIME_DEFAULT),
[this, name = lsaSegment->getName()] { m_lsaStorage.erase(name); });
});
fetcher->onComplete.connect([=] (const ndn::ConstBufferPtr& bufferPtr) {
m_lsaStorage.erase(ndn::Name(lsaName).appendNumber(seqNo - 1));
afterFetchLsa(bufferPtr, interestName);
m_fetchers.erase(it);
});
fetcher->onError.connect([=] (uint32_t errorCode, const std::string& msg) {
onFetchLsaError(errorCode, msg, interestName, timeoutCount, deadline, lsaName, seqNo);
m_fetchers.erase(it);
});
Lsa::Type lsaType;
std::istringstream(interestName[-2].toUri()) >> lsaType;
incrementInterestSentStats(lsaType);
}
void
Lsdb::onFetchLsaError(uint32_t errorCode, const std::string& msg, const ndn::Name& interestName,
uint32_t retransmitNo, const ndn::time::steady_clock::time_point& deadline,
ndn::Name lsaName, uint64_t seqNo)
{
NLSR_LOG_DEBUG("Failed to fetch LSA: " << lsaName << ", Error code: " << errorCode
<< ", Message: " << msg);
if (ndn::time::steady_clock::now() < deadline) {
auto it = m_highestSeqNo.find(lsaName);
if (it != m_highestSeqNo.end() && it->second == seqNo) {
// If the SegmentFetcher failed due to an Interest timeout, it is safe to re-express
// immediately since at the least the LSA Interest lifetime has elapsed.
// Otherwise, it is necessary to delay the Interest re-expression to prevent
// the potential for constant Interest flooding.
auto delay = m_confParam.getLsaInterestLifetime();
if (errorCode == ndn::SegmentFetcher::ErrorCode::INTEREST_TIMEOUT) {
delay = 0_s;
}
m_scheduler.schedule(delay, std::bind(&Lsdb::expressInterest, this, interestName,
retransmitNo + 1, /*Multicast FaceID*/0, deadline));
}
}
}
void
Lsdb::afterFetchLsa(const ndn::ConstBufferPtr& bufferPtr, const ndn::Name& interestName)
{
NLSR_LOG_DEBUG("Received data for LSA interest: " << interestName);
lsaIncrementSignal(Statistics::PacketType::RCV_LSA_DATA);
ndn::Name lsaName = interestName.getSubName(0, interestName.size()-1);
uint64_t seqNo = interestName[-1].toNumber();
if (m_highestSeqNo.find(lsaName) == m_highestSeqNo.end()) {
m_highestSeqNo[lsaName] = seqNo;
}
else if (seqNo > m_highestSeqNo[lsaName]) {
m_highestSeqNo[lsaName] = seqNo;
NLSR_LOG_TRACE("SeqNo for LSA(name): " << interestName << " updated");
}
else if (seqNo < m_highestSeqNo[lsaName]) {
return;
}
std::string chkString("LSA");
int32_t lsaPosition = util::getNameComponentPosition(interestName, chkString);
if (lsaPosition >= 0) {
// Extracts the prefix of the originating router from the data.
ndn::Name originRouter = m_confParam.getNetwork();
originRouter.append(interestName.getSubName(lsaPosition + 1,
interestName.size() - lsaPosition - 3));
try {
Lsa::Type interestedLsType;
std::istringstream(interestName[-2].toUri()) >> interestedLsType;
if (interestedLsType == Lsa::Type::BASE) {
NLSR_LOG_WARN("Received unrecognized LSA Type: " << interestName[-2].toUri());
return;
}
ndn::Block block(bufferPtr);
if (interestedLsType == Lsa::Type::NAME) {
lsaIncrementSignal(Statistics::PacketType::RCV_NAME_LSA_DATA);
if (isLsaNew(originRouter, interestedLsType, seqNo)) {
installLsa(std::make_shared<NameLsa>(block));
}
}
else if (interestedLsType == Lsa::Type::ADJACENCY) {
lsaIncrementSignal(Statistics::PacketType::RCV_ADJ_LSA_DATA);
if (isLsaNew(originRouter, interestedLsType, seqNo)) {
installLsa(std::make_shared<AdjLsa>(block));
}
}
else if (interestedLsType == Lsa::Type::COORDINATE) {
lsaIncrementSignal(Statistics::PacketType::RCV_COORD_LSA_DATA);
if (isLsaNew(originRouter, interestedLsType, seqNo)) {
installLsa(std::make_shared<CoordinateLsa>(block));
}
}
}
catch (const std::exception& e) {
NLSR_LOG_TRACE("LSA data decoding error: " << e.what());
}
}
}
} // namespace nlsr