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QuicClientTransport.cpp
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QuicClientTransport.cpp
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/*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
*/
#include <quic/client/QuicClientTransport.h>
#include <folly/portability/Sockets.h>
#include <quic/api/LoopDetectorCallback.h>
#include <quic/api/QuicTransportFunctions.h>
#include <quic/client/handshake/ClientHandshakeFactory.h>
#include <quic/client/handshake/ClientTransportParametersExtension.h>
#include <quic/client/state/ClientStateMachine.h>
#include <quic/flowcontrol/QuicFlowController.h>
#include <quic/handshake/CryptoFactory.h>
#include <quic/happyeyeballs/QuicHappyEyeballsFunctions.h>
#include <quic/logging/QLoggerConstants.h>
#include <quic/loss/QuicLossFunctions.h>
#include <quic/state/AckHandlers.h>
#include <quic/state/QuicPacingFunctions.h>
#include <quic/state/SimpleFrameFunctions.h>
#include <quic/state/stream/StreamReceiveHandlers.h>
#include <quic/state/stream/StreamSendHandlers.h>
namespace fsp = folly::portability::sockets;
namespace quic {
QuicClientTransport::QuicClientTransport(
folly::EventBase* evb,
std::unique_ptr<folly::AsyncUDPSocket> socket,
std::shared_ptr<ClientHandshakeFactory> handshakeFactory,
size_t connectionIdSize)
: QuicTransportBase(evb, std::move(socket)),
happyEyeballsConnAttemptDelayTimeout_(this) {
DCHECK(handshakeFactory);
// TODO(T53612743) Only enforce that the initial destination connection id
// is at least kMinInitialDestinationConnIdLength.
// All subsequent destination connection ids should be in between
// [kMinSelfConnectionIdSize, kMaxConnectionIdSize]
DCHECK(
connectionIdSize == 0 ||
(connectionIdSize >= kMinInitialDestinationConnIdLength &&
connectionIdSize <= kMaxConnectionIdSize));
auto tempConn =
std::make_unique<QuicClientConnectionState>(std::move(handshakeFactory));
clientConn_ = tempConn.get();
conn_.reset(tempConn.release());
std::vector<uint8_t> connIdData(
std::max(kMinInitialDestinationConnIdLength, connectionIdSize));
folly::Random::secureRandom(connIdData.data(), connIdData.size());
auto connId = ConnectionId(
connectionIdSize == 0 ? std::vector<uint8_t>(0) : connIdData);
conn_->clientConnectionId = connId;
conn_->selfConnectionIds.emplace_back(
std::move(connId), kInitialSequenceNumber);
// Change destination connection to not be same as src connid to suss
// out bugs.
connIdData[0] ^= 0x1;
clientConn_->initialDestinationConnectionId = ConnectionId(connIdData);
conn_->readCodec = std::make_unique<QuicReadCodec>(QuicNodeType::Client);
conn_->readCodec->setClientConnectionId(*conn_->clientConnectionId);
conn_->readCodec->setCodecParameters(CodecParameters(
conn_->peerAckDelayExponent, conn_->originalVersion.value()));
// TODO: generate this once we can generate the packet sequence number
// correctly.
// conn_->nextSequenceNum = folly::Random::secureRandom<PacketNum>();
VLOG(10) << "client created " << *conn_;
}
QuicClientTransport::~QuicClientTransport() {
VLOG(10) << "Destroyed connection to server=" << conn_->peerAddress;
// The caller probably doesn't need the conn callback after destroying the
// transport.
connCallback_ = nullptr;
// Close without draining.
closeImpl(
std::make_pair(
QuicErrorCode(LocalErrorCode::SHUTTING_DOWN),
std::string("Closing from client destructor")),
false);
if (conn_->happyEyeballsState.secondSocket) {
auto sock = std::move(conn_->happyEyeballsState.secondSocket);
sock->pauseRead();
sock->close();
}
}
void QuicClientTransport::processUDPData(
const folly::SocketAddress& peer,
NetworkDataSingle&& networkData) {
BufQueue udpData;
udpData.append(std::move(networkData.data));
if (!conn_->version) {
// We only check for version negotiation packets before the version
// is negotiated.
auto versionNegotiation =
conn_->readCodec->tryParsingVersionNegotiation(udpData);
if (versionNegotiation) {
VLOG(4) << "Got version negotiation packet from peer=" << peer
<< " versions=" << std::hex << versionNegotiation->versions << " "
<< *this;
throw QuicInternalException(
"Received version negotiation packet",
LocalErrorCode::CONNECTION_ABANDONED);
}
}
for (uint16_t processedPackets = 0;
!udpData.empty() && processedPackets < kMaxNumCoalescedPackets;
processedPackets++) {
processPacketData(peer, networkData.receiveTimePoint, udpData);
}
VLOG_IF(4, !udpData.empty())
<< "Leaving " << udpData.chainLength()
<< " bytes unprocessed after attempting to process "
<< kMaxNumCoalescedPackets << " packets.";
}
void QuicClientTransport::processPacketData(
const folly::SocketAddress& peer,
TimePoint receiveTimePoint,
BufQueue& packetQueue) {
auto packetSize = packetQueue.chainLength();
if (packetSize == 0) {
return;
}
auto parsedPacket = conn_->readCodec->parsePacket(
packetQueue, conn_->ackStates, conn_->clientConnectionId->size());
StatelessReset* statelessReset = parsedPacket.statelessReset();
if (statelessReset) {
auto& token = clientConn_->statelessResetToken;
if (statelessReset->token == token) {
VLOG(4) << "Received Stateless Reset " << *this;
conn_->peerConnectionError = std::make_pair(
QuicErrorCode(LocalErrorCode::CONNECTION_RESET),
toString(LocalErrorCode::CONNECTION_RESET).str());
throw QuicInternalException("Peer reset", LocalErrorCode::NO_ERROR);
}
VLOG(4) << "Drop StatelessReset for bad connId or token " << *this;
}
RetryPacket* retryPacket = parsedPacket.retryPacket();
if (retryPacket) {
if (conn_->qLogger) {
conn_->qLogger->addPacket(*retryPacket, packetSize, true);
}
if (!clientConn_->retryToken.empty()) {
VLOG(4) << "Server sent more than one retry packet";
return;
}
const ConnectionId* originalDstConnId =
&(*clientConn_->initialDestinationConnectionId);
if (!clientConn_->clientHandshakeLayer->verifyRetryIntegrityTag(
*originalDstConnId, *retryPacket)) {
VLOG(4) << "The integrity tag in the retry packet was invalid. "
<< "Dropping bad retry packet.";
return;
}
// Set the destination connection ID to be the value from the source
// connection id of the retry packet
clientConn_->initialDestinationConnectionId =
retryPacket->header.getSourceConnId();
auto released = static_cast<QuicClientConnectionState*>(conn_.release());
std::unique_ptr<QuicClientConnectionState> uniqueClient(released);
auto tempConn = undoAllClientStateForRetry(std::move(uniqueClient));
clientConn_ = tempConn.get();
conn_.reset(tempConn.release());
clientConn_->retryToken = retryPacket->header.getToken();
// TODO (amsharma): add a "RetryPacket" QLog event, and log it here.
// TODO (amsharma): verify the "original_connection_id" parameter
// upon receiving a subsequent initial from the server.
startCryptoHandshake();
return;
}
RegularQuicPacket* regularOptional = parsedPacket.regularPacket();
if (!regularOptional) {
if (conn_->qLogger) {
conn_->qLogger->addPacketDrop(packetSize, kParse);
}
QUIC_TRACE(packet_drop, *conn_, "parse");
return;
}
if (happyEyeballsEnabled_) {
happyEyeballsOnDataReceived(
*conn_, happyEyeballsConnAttemptDelayTimeout_, socket_, peer);
}
LongHeader* longHeader = regularOptional->header.asLong();
ShortHeader* shortHeader = regularOptional->header.asShort();
auto protectionLevel = regularOptional->header.getProtectionType();
auto encryptionLevel = protectionTypeToEncryptionLevel(protectionLevel);
auto packetNum = regularOptional->header.getPacketSequenceNum();
auto pnSpace = regularOptional->header.getPacketNumberSpace();
bool isProtectedPacket = protectionLevel == ProtectionType::KeyPhaseZero ||
protectionLevel == ProtectionType::KeyPhaseOne;
auto& regularPacket = *regularOptional;
if (conn_->qLogger) {
conn_->qLogger->addPacket(regularPacket, packetSize);
}
if (!isProtectedPacket) {
for (auto& quicFrame : regularPacket.frames) {
auto isPadding = quicFrame.asPaddingFrame();
auto isAck = quicFrame.asReadAckFrame();
auto isClose = quicFrame.asConnectionCloseFrame();
auto isCrypto = quicFrame.asReadCryptoFrame();
auto isSimple = quicFrame.asQuicSimpleFrame();
auto isPing = isSimple ? isSimple->asPingFrame() : nullptr;
// TODO: add path challenge and response
if (!isPadding && !isAck && !isClose && !isCrypto && !isPing) {
throw QuicTransportException(
"Invalid frame", TransportErrorCode::PROTOCOL_VIOLATION);
}
}
}
// We got a packet that was not the version negotiation packet, that means
// that the version is now bound to the new packet.
// TODO: move this into the state machine.
// TODO: get this from the crypto layer instead. This would be a security vuln
// if we don't.
if (!conn_->version) {
conn_->version = conn_->originalVersion;
}
if (!conn_->serverConnectionId && longHeader) {
conn_->serverConnectionId = longHeader->getSourceConnId();
conn_->peerConnectionIds.emplace_back(
longHeader->getSourceConnId(), kInitialSequenceNumber);
conn_->readCodec->setServerConnectionId(*conn_->serverConnectionId);
}
// Error out if the connection id on the packet is not the one that is
// expected.
bool connidMatched = true;
if (longHeader &&
longHeader->getDestinationConnId() != *conn_->clientConnectionId) {
connidMatched = false;
} else if (
shortHeader &&
shortHeader->getConnectionId() != *conn_->clientConnectionId) {
connidMatched = false;
}
if (!connidMatched) {
throw QuicTransportException(
"Invalid connection id", TransportErrorCode::PROTOCOL_VIOLATION);
}
auto& ackState = getAckState(*conn_, pnSpace);
auto outOfOrder =
updateLargestReceivedPacketNum(ackState, packetNum, receiveTimePoint);
bool pktHasRetransmittableData = false;
bool pktHasCryptoData = false;
for (auto& quicFrame : regularPacket.frames) {
switch (quicFrame.type()) {
case QuicFrame::Type::ReadAckFrame_E: {
VLOG(10) << "Client received ack frame in packet=" << packetNum << " "
<< *this;
ReadAckFrame& ackFrame = *quicFrame.asReadAckFrame();
processAckFrame(
*conn_,
pnSpace,
ackFrame,
[&](const OutstandingPacket& outstandingPacket,
const QuicWriteFrame& packetFrame,
const ReadAckFrame&) {
auto outstandingProtectionType =
outstandingPacket.packet.header.getProtectionType();
if (outstandingProtectionType == ProtectionType::KeyPhaseZero) {
// If we received an ack for data that we sent in 1-rtt from
// the server, we can assume that the server had successfully
// derived the 1-rtt keys and hence received the client
// finished message. We can mark the handshake as confirmed and
// drop the handshake cipher and outstanding packets after the
// processing loop.
if (conn_->handshakeWriteCipher) {
CHECK(conn_->oneRttWriteCipher);
CHECK(conn_->oneRttWriteHeaderCipher);
CHECK(conn_->readCodec->getOneRttReadCipher());
CHECK(conn_->readCodec->getOneRttHeaderCipher());
conn_->handshakeLayer->handshakeConfirmed();
}
// TODO reap
if (*conn_->version == QuicVersion::MVFST_D24) {
cancelHandshakeCryptoStreamRetransmissions(
*conn_->cryptoState);
}
}
switch (packetFrame.type()) {
case QuicWriteFrame::Type::WriteAckFrame_E: {
const WriteAckFrame& frame = *packetFrame.asWriteAckFrame();
DCHECK(!frame.ackBlocks.empty());
VLOG(4) << "Client received ack for largestAcked="
<< frame.ackBlocks.front().end << " " << *this;
commonAckVisitorForAckFrame(ackState, frame);
break;
}
case QuicWriteFrame::Type::RstStreamFrame_E: {
const RstStreamFrame& frame = *packetFrame.asRstStreamFrame();
VLOG(4) << "Client received ack for reset frame stream="
<< frame.streamId << " " << *this;
auto stream = conn_->streamManager->getStream(frame.streamId);
if (stream) {
sendRstAckSMHandler(*stream);
}
break;
}
case QuicWriteFrame::Type::WriteStreamFrame_E: {
const WriteStreamFrame& frame =
*packetFrame.asWriteStreamFrame();
auto ackedStream =
conn_->streamManager->getStream(frame.streamId);
VLOG(4) << "Client got ack for stream=" << frame.streamId
<< " offset=" << frame.offset << " fin=" << frame.fin
<< " data=" << frame.len
<< " closed=" << (ackedStream == nullptr) << " "
<< *this;
if (ackedStream) {
sendAckSMHandler(*ackedStream, frame);
}
break;
}
case QuicWriteFrame::Type::WriteCryptoFrame_E: {
const WriteCryptoFrame& frame =
*packetFrame.asWriteCryptoFrame();
auto cryptoStream = getCryptoStream(
*conn_->cryptoState,
protectionTypeToEncryptionLevel(
outstandingProtectionType));
processCryptoStreamAck(
*cryptoStream, frame.offset, frame.len);
break;
}
case QuicWriteFrame::Type::QuicSimpleFrame_E: {
const quic::QuicSimpleFrame simpleFrame =
*packetFrame.asQuicSimpleFrame();
updateSimpleFrameOnAck(*conn_, simpleFrame);
break;
}
default:
// ignore other frames.
break;
}
},
markPacketLoss,
receiveTimePoint);
break;
}
case QuicFrame::Type::RstStreamFrame_E: {
RstStreamFrame& frame = *quicFrame.asRstStreamFrame();
VLOG(10) << "Client received reset stream=" << frame.streamId << " "
<< *this;
pktHasRetransmittableData = true;
auto streamId = frame.streamId;
auto stream = conn_->streamManager->getStream(streamId);
if (!stream) {
break;
}
receiveRstStreamSMHandler(*stream, std::move(frame));
break;
}
case QuicFrame::Type::ReadCryptoFrame_E: {
pktHasRetransmittableData = true;
pktHasCryptoData = true;
ReadCryptoFrame& cryptoFrame = *quicFrame.asReadCryptoFrame();
VLOG(10) << "Client received crypto data offset=" << cryptoFrame.offset
<< " len=" << cryptoFrame.data->computeChainDataLength()
<< " packetNum=" << packetNum << " " << *this;
appendDataToReadBuffer(
*getCryptoStream(*conn_->cryptoState, encryptionLevel),
StreamBuffer(
std::move(cryptoFrame.data), cryptoFrame.offset, false));
break;
}
case QuicFrame::Type::ReadStreamFrame_E: {
ReadStreamFrame& frame = *quicFrame.asReadStreamFrame();
VLOG(10) << "Client received stream data for stream=" << frame.streamId
<< " offset=" << frame.offset
<< " len=" << frame.data->computeChainDataLength()
<< " fin=" << frame.fin << " packetNum=" << packetNum << " "
<< *this;
auto stream = conn_->streamManager->getStream(frame.streamId);
pktHasRetransmittableData = true;
if (!stream) {
VLOG(10) << "Could not find stream=" << frame.streamId << " "
<< *conn_;
break;
}
receiveReadStreamFrameSMHandler(*stream, std::move(frame));
break;
}
case QuicFrame::Type::MaxDataFrame_E: {
MaxDataFrame& connWindowUpdate = *quicFrame.asMaxDataFrame();
VLOG(10) << "Client received max data offset="
<< connWindowUpdate.maximumData << " " << *this;
pktHasRetransmittableData = true;
handleConnWindowUpdate(*conn_, connWindowUpdate, packetNum);
break;
}
case QuicFrame::Type::MaxStreamDataFrame_E: {
MaxStreamDataFrame& streamWindowUpdate =
*quicFrame.asMaxStreamDataFrame();
VLOG(10) << "Client received max stream data stream="
<< streamWindowUpdate.streamId
<< " offset=" << streamWindowUpdate.maximumData << " "
<< *this;
if (isReceivingStream(conn_->nodeType, streamWindowUpdate.streamId)) {
throw QuicTransportException(
"Received MaxStreamDataFrame for receiving stream.",
TransportErrorCode::STREAM_STATE_ERROR);
}
pktHasRetransmittableData = true;
auto stream =
conn_->streamManager->getStream(streamWindowUpdate.streamId);
if (stream) {
handleStreamWindowUpdate(
*stream, streamWindowUpdate.maximumData, packetNum);
}
break;
}
case QuicFrame::Type::DataBlockedFrame_E: {
VLOG(10) << "Client received blocked " << *this;
pktHasRetransmittableData = true;
handleConnBlocked(*conn_);
break;
}
case QuicFrame::Type::StreamDataBlockedFrame_E: {
// peer wishes to send data, but is unable to due to stream-level flow
// control
StreamDataBlockedFrame& blocked = *quicFrame.asStreamDataBlockedFrame();
VLOG(10) << "Client received blocked stream=" << blocked.streamId << " "
<< *this;
pktHasRetransmittableData = true;
auto stream = conn_->streamManager->getStream(blocked.streamId);
if (stream) {
handleStreamBlocked(*stream);
}
break;
}
case QuicFrame::Type::StreamsBlockedFrame_E: {
// peer wishes to open a stream, but is unable to due to the maximum
// stream limit set by us
StreamsBlockedFrame& blocked = *quicFrame.asStreamsBlockedFrame();
VLOG(10) << "Client received stream blocked limit="
<< blocked.streamLimit << " " << *this;
// TODO implement handler for it
break;
}
case QuicFrame::Type::ConnectionCloseFrame_E: {
ConnectionCloseFrame& connFrame = *quicFrame.asConnectionCloseFrame();
auto errMsg = folly::to<std::string>(
"Client closed by peer reason=", connFrame.reasonPhrase);
VLOG(4) << errMsg << " " << *this;
// we want to deliver app callbacks with the peer supplied error,
// but send a NO_ERROR to the peer.
if (conn_->qLogger) {
conn_->qLogger->addTransportStateUpdate(getPeerClose(errMsg));
}
QUIC_TRACE(recvd_close, *conn_, errMsg.c_str());
conn_->peerConnectionError = std::make_pair(
QuicErrorCode(connFrame.errorCode), std::move(errMsg));
throw QuicTransportException(
"Peer closed", TransportErrorCode::NO_ERROR);
break;
}
case QuicFrame::Type::PaddingFrame_E: {
break;
}
case QuicFrame::Type::QuicSimpleFrame_E: {
QuicSimpleFrame& simpleFrame = *quicFrame.asQuicSimpleFrame();
pktHasRetransmittableData = true;
updateSimpleFrameOnPacketReceived(
*conn_, simpleFrame, packetNum, false);
break;
}
default:
break;
}
}
auto handshakeLayer = clientConn_->clientHandshakeLayer;
if (handshakeLayer->getPhase() == ClientHandshake::Phase::Established &&
*conn_->version != QuicVersion::MVFST_D24) {
handshakeConfirmed(*conn_);
}
// Try reading bytes off of crypto, and performing a handshake.
auto cryptoData = readDataFromCryptoStream(
*getCryptoStream(*conn_->cryptoState, encryptionLevel));
if (cryptoData) {
bool hadOneRttKey = conn_->oneRttWriteCipher != nullptr;
handshakeLayer->doHandshake(std::move(cryptoData), encryptionLevel);
bool oneRttKeyDerivationTriggered = false;
if (!hadOneRttKey && conn_->oneRttWriteCipher) {
oneRttKeyDerivationTriggered = true;
updatePacingOnKeyEstablished(*conn_);
}
if (conn_->oneRttWriteCipher && conn_->readCodec->getOneRttReadCipher() &&
conn_->version != QuicVersion::MVFST_D24) {
conn_->zeroRttWriteCipher.reset();
conn_->zeroRttWriteHeaderCipher.reset();
}
auto zeroRttRejected = handshakeLayer->getZeroRttRejected();
if (zeroRttRejected.has_value() && *zeroRttRejected) {
if (conn_->qLogger) {
conn_->qLogger->addTransportStateUpdate(kZeroRttRejected);
}
QUIC_TRACE(zero_rtt, *conn_, "rejected");
handshakeLayer->removePsk(hostname_);
} else if (zeroRttRejected.has_value()) {
if (conn_->qLogger) {
conn_->qLogger->addTransportStateUpdate(kZeroRttAccepted);
}
QUIC_TRACE(zero_rtt, *conn_, "accepted");
}
// We should get transport parameters if we've derived 1-rtt keys and 0-rtt
// was rejected, or we have derived 1-rtt keys and 0-rtt was never
// attempted.
if ((oneRttKeyDerivationTriggered &&
((zeroRttRejected.has_value() && *zeroRttRejected) ||
!zeroRttRejected.has_value()))) {
auto originalPeerMaxOffset =
conn_->flowControlState.peerAdvertisedMaxOffset;
auto originalPeerInitialStreamOffsetBidiLocal =
conn_->flowControlState.peerAdvertisedInitialMaxStreamOffsetBidiLocal;
auto originalPeerInitialStreamOffsetBidiRemote =
conn_->flowControlState
.peerAdvertisedInitialMaxStreamOffsetBidiRemote;
auto originalPeerInitialStreamOffsetUni =
conn_->flowControlState.peerAdvertisedInitialMaxStreamOffsetUni;
VLOG(10) << "Client negotiated transport params " << *this;
auto serverParams = handshakeLayer->getServerTransportParams();
if (!serverParams) {
throw QuicTransportException(
"No server transport params",
TransportErrorCode::TRANSPORT_PARAMETER_ERROR);
}
auto maxStreamsBidi = getIntegerParameter(
TransportParameterId::initial_max_streams_bidi,
serverParams->parameters);
auto maxStreamsUni = getIntegerParameter(
TransportParameterId::initial_max_streams_uni,
serverParams->parameters);
processServerInitialParams(
*clientConn_, std::move(*serverParams), packetNum);
cacheServerInitialParams(
*clientConn_,
conn_->flowControlState.peerAdvertisedMaxOffset,
conn_->flowControlState.peerAdvertisedInitialMaxStreamOffsetBidiLocal,
conn_->flowControlState
.peerAdvertisedInitialMaxStreamOffsetBidiRemote,
conn_->flowControlState.peerAdvertisedInitialMaxStreamOffsetUni,
maxStreamsBidi.value_or(0),
maxStreamsUni.value_or(0));
auto& statelessResetToken = clientConn_->statelessResetToken;
if (statelessResetToken) {
conn_->readCodec->setStatelessResetToken(*statelessResetToken);
}
if (zeroRttRejected.has_value() && *zeroRttRejected) {
// verify that the new flow control parameters are >= the original
// transport parameters that were use. This is the easy case. If the
// flow control decreases then we are just screwed and we need to have
// the app retry the connection. The other parameters can be updated.
// TODO: implement undo transport state on retry.
if (originalPeerMaxOffset >
conn_->flowControlState.peerAdvertisedMaxOffset ||
originalPeerInitialStreamOffsetBidiLocal >
conn_->flowControlState
.peerAdvertisedInitialMaxStreamOffsetBidiLocal ||
originalPeerInitialStreamOffsetBidiRemote >
conn_->flowControlState
.peerAdvertisedInitialMaxStreamOffsetBidiRemote ||
originalPeerInitialStreamOffsetUni >
conn_->flowControlState
.peerAdvertisedInitialMaxStreamOffsetUni) {
throw QuicTransportException(
"Rejection of zero rtt parameters unsupported",
TransportErrorCode::TRANSPORT_PARAMETER_ERROR);
}
}
}
if (zeroRttRejected.has_value() && *zeroRttRejected) {
// TODO: Make sure the alpn is the same, if not then do a full undo of the
// state.
clientConn_->zeroRttWriteCipher.reset();
clientConn_->zeroRttWriteHeaderCipher.reset();
markZeroRttPacketsLost(*conn_, markPacketLoss);
}
}
// TODO this is incorrect and needs to be removed post MVFST_D24
if (conn_->version == QuicVersion::MVFST_D24 &&
(protectionLevel == ProtectionType::KeyPhaseZero ||
protectionLevel == ProtectionType::KeyPhaseOne)) {
DCHECK(conn_->oneRttWriteCipher);
clientConn_->clientHandshakeLayer->handshakeConfirmed();
conn_->readCodec->onHandshakeDone(receiveTimePoint);
}
updateAckSendStateOnRecvPacket(
*conn_,
ackState,
outOfOrder,
pktHasRetransmittableData,
pktHasCryptoData);
}
void QuicClientTransport::onReadData(
const folly::SocketAddress& peer,
NetworkDataSingle&& networkData) {
if (closeState_ == CloseState::CLOSED) {
// If we are closed, then we shoudn't process new network data.
// TODO: we might want to process network data if we decide that we should
// exit draining state early
if (conn_->qLogger) {
conn_->qLogger->addPacketDrop(0, kAlreadyClosed);
}
QUIC_TRACE(packet_drop, *conn_, "already_closed");
return;
}
bool waitingForFirstPacket = !hasReceivedPackets(*conn_);
processUDPData(peer, std::move(networkData));
if (connCallback_ && waitingForFirstPacket && hasReceivedPackets(*conn_)) {
connCallback_->onFirstPeerPacketProcessed();
}
if (!transportReadyNotified_ && hasWriteCipher()) {
transportReadyNotified_ = true;
CHECK_NOTNULL(connCallback_)->onTransportReady();
}
// Checking connCallback_ because application will start to write data
// in onTransportReady, if the write fails, QuicSocket can be closed
// and connCallback_ is set nullptr.
if (connCallback_ && !replaySafeNotified_ && conn_->oneRttWriteCipher) {
replaySafeNotified_ = true;
// We don't need this any more. Also unset it so that we don't allow random
// middleboxes to shutdown our connection once we have crypto keys.
socket_->setErrMessageCallback(nullptr);
connCallback_->onReplaySafe();
}
}
void QuicClientTransport::writeData() {
// TODO: replace with write in state machine.
// TODO: change to draining when we move the client to have a draining state
// as well.
QuicVersion version = conn_->version.value_or(*conn_->originalVersion);
const ConnectionId& srcConnId = *conn_->clientConnectionId;
const ConnectionId* destConnId =
&(*clientConn_->initialDestinationConnectionId);
if (conn_->serverConnectionId) {
destConnId = &(*conn_->serverConnectionId);
}
if (closeState_ == CloseState::CLOSED) {
auto rtt = clientConn_->lossState.srtt == 0us
? clientConn_->transportSettings.initialRtt
: clientConn_->lossState.srtt;
if (clientConn_->lastCloseSentTime &&
Clock::now() - *clientConn_->lastCloseSentTime < rtt) {
return;
}
clientConn_->lastCloseSentTime = Clock::now();
if (clientConn_->clientHandshakeLayer->getPhase() ==
ClientHandshake::Phase::Established &&
conn_->oneRttWriteCipher) {
CHECK(conn_->oneRttWriteHeaderCipher);
writeShortClose(
*socket_,
*conn_,
*destConnId,
conn_->localConnectionError,
*conn_->oneRttWriteCipher,
*conn_->oneRttWriteHeaderCipher);
}
if (conn_->handshakeWriteCipher &&
*conn_->version != QuicVersion::MVFST_D24) {
CHECK(conn_->handshakeWriteHeaderCipher);
writeLongClose(
*socket_,
*conn_,
srcConnId,
*destConnId,
LongHeader::Types::Handshake,
conn_->localConnectionError,
*conn_->handshakeWriteCipher,
*conn_->handshakeWriteHeaderCipher,
version);
}
if (conn_->initialWriteCipher) {
CHECK(conn_->initialHeaderCipher);
writeLongClose(
*socket_,
*conn_,
srcConnId,
*destConnId,
LongHeader::Types::Initial,
conn_->localConnectionError,
*conn_->initialWriteCipher,
*conn_->initialHeaderCipher,
version);
}
return;
}
uint64_t packetLimit =
(isConnectionPaced(*conn_)
? conn_->pacer->updateAndGetWriteBatchSize(Clock::now())
: conn_->transportSettings.writeConnectionDataPacketsLimit);
if (conn_->initialWriteCipher) {
CryptoStreamScheduler initialScheduler(
*conn_,
*getCryptoStream(*conn_->cryptoState, EncryptionLevel::Initial));
if (initialScheduler.hasData() ||
(conn_->ackStates.initialAckState.needsToSendAckImmediately &&
hasAcksToSchedule(conn_->ackStates.initialAckState))) {
CHECK(conn_->initialHeaderCipher);
packetLimit -= writeCryptoAndAckDataToSocket(
*socket_,
*conn_,
srcConnId /* src */,
*destConnId /* dst */,
LongHeader::Types::Initial,
*conn_->initialWriteCipher,
*conn_->initialHeaderCipher,
version,
packetLimit,
clientConn_->retryToken);
}
if (!packetLimit) {
return;
}
}
if (conn_->handshakeWriteCipher) {
CryptoStreamScheduler handshakeScheduler(
*conn_,
*getCryptoStream(*conn_->cryptoState, EncryptionLevel::Handshake));
if (handshakeScheduler.hasData() ||
(conn_->ackStates.handshakeAckState.needsToSendAckImmediately &&
hasAcksToSchedule(conn_->ackStates.handshakeAckState))) {
CHECK(conn_->handshakeWriteHeaderCipher);
packetLimit -= writeCryptoAndAckDataToSocket(
*socket_,
*conn_,
srcConnId /* src */,
*destConnId /* dst */,
LongHeader::Types::Handshake,
*conn_->handshakeWriteCipher,
*conn_->handshakeWriteHeaderCipher,
version,
packetLimit);
}
if (!packetLimit) {
return;
}
}
if (clientConn_->zeroRttWriteCipher && !conn_->oneRttWriteCipher) {
CHECK(clientConn_->zeroRttWriteHeaderCipher);
packetLimit -= writeZeroRttDataToSocket(
*socket_,
*conn_,
srcConnId /* src */,
*destConnId /* dst */,
*clientConn_->zeroRttWriteCipher,
*clientConn_->zeroRttWriteHeaderCipher,
version,
packetLimit);
}
if (!packetLimit) {
return;
}
if (conn_->oneRttWriteCipher) {
CHECK(clientConn_->oneRttWriteHeaderCipher);
writeQuicDataExceptCryptoStreamToSocket(
*socket_,
*conn_,
srcConnId,
*destConnId,
*conn_->oneRttWriteCipher,
*conn_->oneRttWriteHeaderCipher,
version,
packetLimit);
}
}
void QuicClientTransport::startCryptoHandshake() {
auto self = this->shared_from_this();
// Set idle timer whenever crypto starts so that we can restart the idle timer
// after a version negotiation as well.
setIdleTimer();
// TODO: no need to close the transport if there is an error in the
// handshake.
// We need to update the flow control settings every time we start a crypto
// handshake. This is so that we can reset the flow control settings when
// we go through version negotiation as well.
updateFlowControlStateWithSettings(
conn_->flowControlState, conn_->transportSettings);
auto handshakeLayer = clientConn_->clientHandshakeLayer;
auto& cryptoFactory = handshakeLayer->getCryptoFactory();
auto version = conn_->originalVersion.value();
conn_->initialWriteCipher = cryptoFactory.getClientInitialCipher(
*clientConn_->initialDestinationConnectionId, version);
conn_->readCodec->setInitialReadCipher(cryptoFactory.getServerInitialCipher(
*clientConn_->initialDestinationConnectionId, version));
conn_->readCodec->setInitialHeaderCipher(
cryptoFactory.makeServerInitialHeaderCipher(
*clientConn_->initialDestinationConnectionId, version));
conn_->initialHeaderCipher = cryptoFactory.makeClientInitialHeaderCipher(
*clientConn_->initialDestinationConnectionId, version);
// Add partial reliability parameter to customTransportParameters_.
setPartialReliabilityTransportParameter();
auto paramsExtension = std::make_shared<ClientTransportParametersExtension>(
conn_->originalVersion.value(),
conn_->transportSettings.advertisedInitialConnectionWindowSize,
conn_->transportSettings.advertisedInitialBidiLocalStreamWindowSize,
conn_->transportSettings.advertisedInitialBidiRemoteStreamWindowSize,
conn_->transportSettings.advertisedInitialUniStreamWindowSize,
conn_->transportSettings.advertisedInitialMaxStreamsBidi,
conn_->transportSettings.advertisedInitialMaxStreamsUni,
conn_->transportSettings.idleTimeout,
conn_->transportSettings.ackDelayExponent,
conn_->transportSettings.maxRecvPacketSize,
conn_->transportSettings.selfActiveConnectionIdLimit,
customTransportParameters_);
conn_->transportParametersEncoded = true;
handshakeLayer->connect(hostname_, std::move(paramsExtension));
writeSocketData();
if (!transportReadyNotified_ && clientConn_->zeroRttWriteCipher) {
transportReadyNotified_ = true;
runOnEvbAsync([](auto self) {
auto clientPtr = static_cast<QuicClientTransport*>(self.get());
if (clientPtr->connCallback_) {
clientPtr->connCallback_->onTransportReady();
}
});
}
}
bool QuicClientTransport::hasWriteCipher() const {
return clientConn_->oneRttWriteCipher || clientConn_->zeroRttWriteCipher;
}
std::shared_ptr<QuicTransportBase> QuicClientTransport::sharedGuard() {
return shared_from_this();
}
bool QuicClientTransport::isTLSResumed() const {
return clientConn_->clientHandshakeLayer->isTLSResumed();
}
void QuicClientTransport::errMessage(
FOLLY_MAYBE_UNUSED const cmsghdr& cmsg) noexcept {
#ifdef FOLLY_HAVE_MSG_ERRQUEUE
if ((cmsg.cmsg_level == SOL_IP && cmsg.cmsg_type == IP_RECVERR) ||
(cmsg.cmsg_level == SOL_IPV6 && cmsg.cmsg_type == IPV6_RECVERR)) {
const struct sock_extended_err* serr =
reinterpret_cast<const struct sock_extended_err*>(CMSG_DATA(&cmsg));
auto connectionError = (serr->ee_errno == ECONNREFUSED) ||
(serr->ee_errno == ENETUNREACH) || (serr->ee_errno == ENETDOWN);
if (!connectionError) {
return;
}
auto errStr = folly::errnoStr(serr->ee_errno);
runOnEvbAsync([errString = std::move(errStr)](auto self) {
auto quicError = std::make_pair(
QuicErrorCode(LocalErrorCode::CONNECT_FAILED), errString);
auto clientPtr = static_cast<QuicClientTransport*>(self.get());
clientPtr->closeImpl(std::move(quicError), false, false);
});
}
#endif
}
void QuicClientTransport::onReadError(
const folly::AsyncSocketException& ex) noexcept {
if (conn_->transportSettings.closeClientOnReadError &&
closeState_ == CloseState::OPEN) {
// closeNow will skip draining the socket. onReadError doesn't gets
// triggered by retriable errors. If we are here, there is no point of
// draining the socket.
runOnEvbAsync([ex](auto self) {
auto clientPtr = static_cast<QuicClientTransport*>(self.get());
clientPtr->closeNow(std::make_pair(
QuicErrorCode(LocalErrorCode::CONNECTION_ABANDONED),
std::string(ex.what())));
});
}
}
void QuicClientTransport::getReadBuffer(void** buf, size_t* len) noexcept {
DCHECK(conn_) << "trying to receive packets without a connection";
auto readBufferSize =
conn_->transportSettings.maxRecvPacketSize * numGROBuffers_;
readBuffer_ = folly::IOBuf::create(readBufferSize);
*buf = readBuffer_->writableData();
*len = readBufferSize;
}
void QuicClientTransport::onDataAvailable(
const folly::SocketAddress& server,
size_t len,
bool truncated,
OnDataAvailableParams params) noexcept {
VLOG(10) << "Got data from socket peer=" << server << " len=" << len;
auto packetReceiveTime = Clock::now();
Buf data = std::move(readBuffer_);
if (params.gro_ <= 0) {
if (truncated) {
// This is an error, drop the packet.
if (conn_->qLogger) {
conn_->qLogger->addPacketDrop(len, kUdpTruncated);
}
QUIC_TRACE(packet_drop, *conn_, "udp_truncated");
if (conn_->loopDetectorCallback) {
conn_->readDebugState.noReadReason = NoReadReason::TRUNCATED;
conn_->loopDetectorCallback->onSuspiciousReadLoops(
++conn_->readDebugState.loopCount,
conn_->readDebugState.noReadReason);
}
return;
}
data->append(len);
if (conn_->qLogger) {
conn_->qLogger->addDatagramReceived(len);
}
NetworkData networkData(std::move(data), packetReceiveTime);
onNetworkData(server, std::move(networkData));
} else {
// if we receive a truncated packet
// we still need to consider the prev valid ones
// AsyncUDPSocket::handleRead() sets the len to be the
// buffer size in case the data is truncated
if (truncated) {
auto delta = len % params.gro_;
len -= delta;
if (conn_->qLogger) {
conn_->qLogger->addPacketDrop(delta, kUdpTruncated);
}
QUIC_TRACE(packet_drop, *conn_, "udp_truncated");
}
data->append(len);
if (conn_->qLogger) {
conn_->qLogger->addDatagramReceived(len);
}
NetworkData networkData;
networkData.receiveTimePoint = packetReceiveTime;
networkData.packets.reserve((len + params.gro_ - 1) / params.gro_);
size_t remaining = len;
size_t offset = 0;
while (remaining) {
if (static_cast<int>(remaining) > params.gro_) {
auto tmp = data->cloneOne();
// start at offset
tmp->trimStart(offset);
// the actual len is len - offset now
// leave params.gro_ bytes
tmp->trimEnd(len - offset - params.gro_);
DCHECK_EQ(tmp->length(), params.gro_);
offset += params.gro_;
remaining -= params.gro_;
networkData.packets.emplace_back(std::move(tmp));
} else {