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389dd667ed
Summary: Add new QUIC version MVFST_EXPERIMENTAL5 with same salt as MVFST_EXPERIMENTAL4 Reviewed By: mjoras Differential Revision: D73285467 fbshipit-source-id: 2d4b8828574f604dab1072847149a5cff2964209
1764 lines
67 KiB
C++
1764 lines
67 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#include <quic/fizz/server/handshake/AppToken.h>
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#include <quic/server/handshake/TokenGenerator.h>
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#include <quic/server/state/ServerStateMachine.h>
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#include <quic/api/QuicTransportFunctions.h>
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#include <quic/common/BufUtil.h>
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#include <quic/congestion_control/CongestionControllerFactory.h>
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#include <quic/congestion_control/TokenlessPacer.h>
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#include <quic/fizz/handshake/FizzCryptoFactory.h>
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#include <quic/flowcontrol/QuicFlowController.h>
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#include <quic/handshake/TransportParameters.h>
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#include <quic/logging/QLoggerConstants.h>
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#include <quic/state/DatagramHandlers.h>
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#include <quic/state/QuicPacingFunctions.h>
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#include <quic/state/QuicStreamFunctions.h>
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#include <quic/state/QuicTransportStatsCallback.h>
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#include <quic/state/SimpleFrameFunctions.h>
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#include <quic/state/stream/StreamReceiveHandlers.h>
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#include <quic/state/stream/StreamSendHandlers.h>
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namespace quic {
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using namespace std::chrono_literals;
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namespace {
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constexpr size_t kConnIdEncodingRetryLimit = 32;
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bool maybeNATRebinding(
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const folly::SocketAddress& newPeerAddress,
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const folly::SocketAddress& oldPeerAddress) {
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auto& newIPAddr = newPeerAddress.getIPAddress();
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auto& oldIPAddr = oldPeerAddress.getIPAddress();
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// Port changed
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if (newIPAddr == oldIPAddr) {
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return true;
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}
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return newIPAddr.isV4() && oldIPAddr.isV4() &&
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newIPAddr.inSubnet(oldIPAddr, 24);
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}
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CongestionAndRttState moveCurrentCongestionAndRttState(
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QuicServerConnectionState& conn) {
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CongestionAndRttState state;
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state.peerAddress = conn.peerAddress;
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state.recordTime = Clock::now();
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state.congestionController = std::move(conn.congestionController);
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state.srtt = conn.lossState.srtt;
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state.lrtt = conn.lossState.lrtt;
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state.rttvar = conn.lossState.rttvar;
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state.mrtt = conn.lossState.mrtt;
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return state;
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}
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void resetCongestionAndRttState(QuicServerConnectionState& conn) {
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CHECK(conn.congestionControllerFactory)
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<< "CongestionControllerFactory is not set.";
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conn.congestionController =
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conn.congestionControllerFactory->makeCongestionController(
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conn, conn.transportSettings.defaultCongestionController);
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conn.lossState.srtt = 0us;
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conn.lossState.lrtt = 0us;
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conn.lossState.rttvar = 0us;
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conn.lossState.mrtt = kDefaultMinRtt;
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}
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void recoverOrResetCongestionAndRttState(
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QuicServerConnectionState& conn,
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const folly::SocketAddress& peerAddress) {
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auto& lastState = conn.migrationState.lastCongestionAndRtt;
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if (lastState && lastState->peerAddress == peerAddress &&
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(Clock::now() - lastState->recordTime <=
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kTimeToRetainLastCongestionAndRttState)) {
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// recover from matched non-stale state
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conn.congestionController = std::move(lastState->congestionController);
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conn.lossState.srtt = lastState->srtt;
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conn.lossState.lrtt = lastState->lrtt;
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conn.lossState.rttvar = lastState->rttvar;
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conn.lossState.mrtt = lastState->mrtt;
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conn.migrationState.lastCongestionAndRtt.reset();
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} else {
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resetCongestionAndRttState(conn);
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}
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}
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void maybeSetExperimentalSettings(QuicServerConnectionState& conn) {
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// no-op versions
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if (conn.version == QuicVersion::MVFST_EXPERIMENTAL) {
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} else if (conn.version == QuicVersion::MVFST_EXPERIMENTAL2) {
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} else if (conn.version == QuicVersion::MVFST_EXPERIMENTAL3) {
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} else if (conn.version == QuicVersion::MVFST_EXPERIMENTAL4) {
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} else if (conn.version == QuicVersion::MVFST_EXPERIMENTAL5) {
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}
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}
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/**
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* Only certain frames are allowed/disallowed in unprotected (initial,
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* handshake) and zero-rtt packets.
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*/
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bool isUnprotectedPacketFrameInvalid(const QuicFrame& quicFrame) {
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switch (quicFrame.type()) {
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case QuicFrame::Type::PaddingFrame:
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case QuicFrame::Type::ReadAckFrame:
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case QuicFrame::Type::ConnectionCloseFrame:
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case QuicFrame::Type::ReadCryptoFrame:
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case QuicFrame::Type::PingFrame:
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return false;
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case QuicFrame::Type::RstStreamFrame:
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case QuicFrame::Type::MaxDataFrame:
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case QuicFrame::Type::MaxStreamDataFrame:
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case QuicFrame::Type::DataBlockedFrame:
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case QuicFrame::Type::StreamDataBlockedFrame:
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case QuicFrame::Type::StreamsBlockedFrame:
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case QuicFrame::Type::ReadStreamFrame:
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case QuicFrame::Type::ReadNewTokenFrame:
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case QuicFrame::Type::DatagramFrame:
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case QuicFrame::Type::NoopFrame:
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case QuicFrame::Type::ImmediateAckFrame:
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case QuicFrame::Type::QuicSimpleFrame:
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return true;
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}
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folly::assume_unreachable();
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}
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bool isZeroRttPacketSimpleFrameInvalid(const QuicSimpleFrame& quicSimpleFrame) {
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switch (quicSimpleFrame.type()) {
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case QuicSimpleFrame::Type::HandshakeDoneFrame:
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case QuicSimpleFrame::Type::RetireConnectionIdFrame:
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case QuicSimpleFrame::Type::PathResponseFrame:
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case QuicSimpleFrame::Type::AckFrequencyFrame:
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return true;
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case QuicSimpleFrame::Type::StopSendingFrame:
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case QuicSimpleFrame::Type::PathChallengeFrame:
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case QuicSimpleFrame::Type::NewConnectionIdFrame:
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case QuicSimpleFrame::Type::MaxStreamsFrame:
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case QuicSimpleFrame::Type::KnobFrame:
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case QuicSimpleFrame::Type::NewTokenFrame:
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return false;
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}
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folly::assume_unreachable();
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}
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bool isZeroRttPacketFrameInvalid(const QuicFrame& quicFrame) {
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switch (quicFrame.type()) {
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case QuicFrame::Type::ReadAckFrame:
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case QuicFrame::Type::ReadCryptoFrame:
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case QuicFrame::Type::ReadNewTokenFrame:
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case QuicFrame::Type::ImmediateAckFrame:
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return true;
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case QuicFrame::Type::PingFrame:
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case QuicFrame::Type::ConnectionCloseFrame:
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case QuicFrame::Type::PaddingFrame:
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case QuicFrame::Type::RstStreamFrame:
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case QuicFrame::Type::MaxDataFrame:
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case QuicFrame::Type::MaxStreamDataFrame:
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case QuicFrame::Type::DataBlockedFrame:
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case QuicFrame::Type::StreamDataBlockedFrame:
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case QuicFrame::Type::StreamsBlockedFrame:
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case QuicFrame::Type::ReadStreamFrame:
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case QuicFrame::Type::DatagramFrame:
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case QuicFrame::Type::NoopFrame:
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return false;
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case QuicFrame::Type::QuicSimpleFrame:
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return isZeroRttPacketSimpleFrameInvalid(*quicFrame.asQuicSimpleFrame());
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}
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folly::assume_unreachable();
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}
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} // namespace
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folly::Expected<folly::Unit, QuicError> processClientInitialParams(
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QuicServerConnectionState& conn,
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const ClientTransportParameters& clientParams) {
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auto preferredAddress = getIntegerParameter(
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TransportParameterId::preferred_address, clientParams.parameters);
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auto origConnId = getIntegerParameter(
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TransportParameterId::original_destination_connection_id,
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clientParams.parameters);
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auto statelessResetToken = getIntegerParameter(
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TransportParameterId::stateless_reset_token, clientParams.parameters);
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auto retrySourceConnId = getIntegerParameter(
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TransportParameterId::retry_source_connection_id,
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clientParams.parameters);
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auto maxData = getIntegerParameter(
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TransportParameterId::initial_max_data, clientParams.parameters);
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auto maxStreamDataBidiLocal = getIntegerParameter(
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TransportParameterId::initial_max_stream_data_bidi_local,
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clientParams.parameters);
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auto maxStreamDataBidiRemote = getIntegerParameter(
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TransportParameterId::initial_max_stream_data_bidi_remote,
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clientParams.parameters);
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auto maxStreamDataUni = getIntegerParameter(
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TransportParameterId::initial_max_stream_data_uni,
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clientParams.parameters);
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auto maxStreamsBidi = getIntegerParameter(
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TransportParameterId::initial_max_streams_bidi, clientParams.parameters);
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auto maxStreamsUni = getIntegerParameter(
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TransportParameterId::initial_max_streams_uni, clientParams.parameters);
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auto idleTimeout = getIntegerParameter(
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TransportParameterId::idle_timeout, clientParams.parameters);
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auto ackDelayExponent = getIntegerParameter(
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TransportParameterId::ack_delay_exponent, clientParams.parameters);
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auto packetSize = getIntegerParameter(
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TransportParameterId::max_packet_size, clientParams.parameters);
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auto activeConnectionIdLimit = getIntegerParameter(
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TransportParameterId::active_connection_id_limit,
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clientParams.parameters);
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auto minAckDelay = getIntegerParameter(
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TransportParameterId::min_ack_delay, clientParams.parameters);
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auto maxAckDelay = getIntegerParameter(
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TransportParameterId::max_ack_delay, clientParams.parameters);
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auto maxDatagramFrameSize = getIntegerParameter(
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TransportParameterId::max_datagram_frame_size, clientParams.parameters);
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auto peerAdvertisedMaxStreamGroups = getIntegerParameter(
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static_cast<TransportParameterId>(
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TransportParameterId::stream_groups_enabled),
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clientParams.parameters);
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auto isAckReceiveTimestampsEnabled = getIntegerParameter(
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TransportParameterId::ack_receive_timestamps_enabled,
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clientParams.parameters);
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auto maxReceiveTimestampsPerAck = getIntegerParameter(
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TransportParameterId::max_receive_timestamps_per_ack,
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clientParams.parameters);
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auto receiveTimestampsExponent = getIntegerParameter(
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TransportParameterId::receive_timestamps_exponent,
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clientParams.parameters);
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if (conn.version == QuicVersion::QUIC_V1 ||
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conn.version == QuicVersion::QUIC_V1_ALIAS ||
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conn.version == QuicVersion::QUIC_V1_ALIAS2) {
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auto initialSourceConnId = getConnIdParameter(
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TransportParameterId::initial_source_connection_id,
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clientParams.parameters);
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if (!initialSourceConnId ||
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initialSourceConnId.value() !=
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conn.readCodec->getClientConnectionId()) {
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return folly::makeUnexpected(QuicError(
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TransportErrorCode::TRANSPORT_PARAMETER_ERROR,
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"Initial CID does not match."));
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}
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}
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auto knobFrameSupported = getIntegerParameter(
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static_cast<TransportParameterId>(
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TransportParameterId::knob_frames_supported),
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clientParams.parameters);
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auto extendedAckFeatures = getIntegerParameter(
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static_cast<TransportParameterId>(
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TransportParameterId::extended_ack_features),
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clientParams.parameters);
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auto reliableResetTpIter = findParameter(
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clientParams.parameters,
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static_cast<TransportParameterId>(
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TransportParameterId::reliable_stream_reset));
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if (reliableResetTpIter != clientParams.parameters.end()) {
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if (!reliableResetTpIter->value->empty()) {
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return folly::makeUnexpected(QuicError(
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TransportErrorCode::TRANSPORT_PARAMETER_ERROR,
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"Reliable reset transport parameter must be empty"));
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}
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conn.peerAdvertisedReliableStreamResetSupport = true;
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} else {
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conn.peerAdvertisedReliableStreamResetSupport = false;
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}
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// validate that we didn't receive original connection ID, stateless
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// reset token, or preferred address.
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if (preferredAddress && *preferredAddress != 0) {
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return folly::makeUnexpected(QuicError(
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TransportErrorCode::TRANSPORT_PARAMETER_ERROR,
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"Preferred Address is received by server"));
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}
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if (origConnId && *origConnId != 0) {
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return folly::makeUnexpected(QuicError(
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TransportErrorCode::TRANSPORT_PARAMETER_ERROR,
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"OriginalDestinationConnectionId is received by server"));
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}
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if (statelessResetToken && statelessResetToken.value() != 0) {
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return folly::makeUnexpected(QuicError(
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TransportErrorCode::TRANSPORT_PARAMETER_ERROR,
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"Stateless Reset Token is received by server"));
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}
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if (retrySourceConnId && retrySourceConnId.value() != 0) {
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return folly::makeUnexpected(QuicError(
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TransportErrorCode::TRANSPORT_PARAMETER_ERROR,
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"Retry Source Connection ID is received by server"));
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}
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if (maxAckDelay && *maxAckDelay >= kMaxAckDelay) {
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return folly::makeUnexpected(QuicError(
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TransportErrorCode::TRANSPORT_PARAMETER_ERROR,
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"Max Ack Delay is greater than 2^14 "));
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}
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// TODO Validate active_connection_id_limit
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if (packetSize && *packetSize < kMinMaxUDPPayload) {
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return folly::makeUnexpected(QuicError(
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TransportErrorCode::TRANSPORT_PARAMETER_ERROR,
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folly::to<std::string>(
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"Max packet size too small. received max_packetSize = ",
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*packetSize)));
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}
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VLOG(10) << "Client advertised flow control ";
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VLOG(10) << "conn=" << maxData.value_or(0);
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VLOG(10) << " stream bidi local=" << maxStreamDataBidiLocal.value_or(0)
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<< " ";
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VLOG(10) << " stream bidi remote=" << maxStreamDataBidiRemote.value_or(0)
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<< " ";
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VLOG(10) << " stream uni=" << maxStreamDataUni.value_or(0) << " ";
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VLOG(10) << conn;
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conn.flowControlState.peerAdvertisedMaxOffset = maxData.value_or(0);
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conn.flowControlState.peerAdvertisedInitialMaxStreamOffsetBidiLocal =
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maxStreamDataBidiLocal.value_or(0);
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conn.flowControlState.peerAdvertisedInitialMaxStreamOffsetBidiRemote =
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maxStreamDataBidiRemote.value_or(0);
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conn.flowControlState.peerAdvertisedInitialMaxStreamOffsetUni =
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maxStreamDataUni.value_or(0);
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auto maxBidiStreamsResult =
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conn.streamManager->setMaxLocalBidirectionalStreams(
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maxStreamsBidi.value_or(0));
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if (!maxBidiStreamsResult) {
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return folly::makeUnexpected(QuicError(
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TransportErrorCode::TRANSPORT_PARAMETER_ERROR,
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"Failed to set max local bidirectional streams"));
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}
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auto maxUniStreamsResult =
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conn.streamManager->setMaxLocalUnidirectionalStreams(
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maxStreamsUni.value_or(0));
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if (!maxUniStreamsResult) {
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return folly::makeUnexpected(QuicError(
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TransportErrorCode::TRANSPORT_PARAMETER_ERROR,
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"Failed to set max local unidirectional streams"));
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}
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conn.peerIdleTimeout = std::chrono::milliseconds(idleTimeout.value_or(0));
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conn.peerIdleTimeout = timeMin(conn.peerIdleTimeout, kMaxIdleTimeout);
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if (ackDelayExponent && *ackDelayExponent > kMaxAckDelayExponent) {
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return folly::makeUnexpected(QuicError(
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TransportErrorCode::TRANSPORT_PARAMETER_ERROR,
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"ack_delay_exponent too large"));
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}
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conn.peerAckDelayExponent =
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ackDelayExponent.value_or(kDefaultAckDelayExponent);
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if (minAckDelay.hasValue()) {
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conn.peerMinAckDelay = std::chrono::microseconds(minAckDelay.value());
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}
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if (maxDatagramFrameSize.hasValue()) {
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if (maxDatagramFrameSize.value() > 0 &&
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maxDatagramFrameSize.value() <= kMaxDatagramPacketOverhead) {
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return folly::makeUnexpected(QuicError(
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TransportErrorCode::TRANSPORT_PARAMETER_ERROR,
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"max_datagram_frame_size too small"));
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}
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conn.datagramState.maxWriteFrameSize = maxDatagramFrameSize.value();
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}
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// Default to max because we can probe PMTU now, and this will be the upper
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// limit
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uint64_t maxUdpPayloadSize = kDefaultMaxUDPPayload;
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if (packetSize) {
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maxUdpPayloadSize = std::min(*packetSize, maxUdpPayloadSize);
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conn.peerMaxUdpPayloadSize = maxUdpPayloadSize;
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if (conn.transportSettings.canIgnorePathMTU) {
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*packetSize = std::min<uint64_t>(*packetSize, kDefaultMaxUDPPayload);
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conn.udpSendPacketLen = *packetSize;
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}
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}
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conn.peerActiveConnectionIdLimit =
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activeConnectionIdLimit.value_or(kDefaultActiveConnectionIdLimit);
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if (peerAdvertisedMaxStreamGroups) {
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conn.peerAdvertisedMaxStreamGroups = *peerAdvertisedMaxStreamGroups;
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}
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if (isAckReceiveTimestampsEnabled.has_value() &&
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isAckReceiveTimestampsEnabled.value() == 1) {
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if (maxReceiveTimestampsPerAck.has_value() &&
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receiveTimestampsExponent.has_value()) {
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conn.maybePeerAckReceiveTimestampsConfig.assign(
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{std::min(
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static_cast<uint8_t>(maxReceiveTimestampsPerAck.value()),
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static_cast<uint8_t>(
|
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conn.transportSettings.maxReceiveTimestampsPerAckStored)),
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std::max(
|
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static_cast<uint8_t>(receiveTimestampsExponent.value()),
|
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static_cast<uint8_t>(0))});
|
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}
|
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}
|
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|
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conn.peerAdvertisedKnobFrameSupport = knobFrameSupported.value_or(0) > 0;
|
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conn.peerAdvertisedExtendedAckFeatures = extendedAckFeatures.value_or(0);
|
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|
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return folly::unit;
|
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}
|
||
|
||
folly::Expected<folly::Unit, QuicError> updateHandshakeState(
|
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QuicServerConnectionState& conn) {
|
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// Zero RTT read cipher is available after chlo is processed with the
|
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// condition that early data attempt is accepted.
|
||
auto handshakeLayer = conn.serverHandshakeLayer;
|
||
auto zeroRttReadCipherResult = handshakeLayer->getZeroRttReadCipher();
|
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if (zeroRttReadCipherResult.hasError()) {
|
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return folly::makeUnexpected(zeroRttReadCipherResult.error());
|
||
}
|
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auto zeroRttReadCipher = std::move(zeroRttReadCipherResult.value());
|
||
|
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auto zeroRttHeaderCipherResult = handshakeLayer->getZeroRttReadHeaderCipher();
|
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if (zeroRttHeaderCipherResult.hasError()) {
|
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return folly::makeUnexpected(zeroRttHeaderCipherResult.error());
|
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}
|
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auto zeroRttHeaderCipher = std::move(zeroRttHeaderCipherResult.value());
|
||
|
||
// One RTT write cipher is available at Fizz layer after chlo is processed.
|
||
// However, the cipher is only exported to QUIC if early data attempt is
|
||
// accepted. Otherwise, the cipher will be available after cfin is
|
||
// processed.
|
||
auto oneRttWriteCipherResult = handshakeLayer->getFirstOneRttWriteCipher();
|
||
if (oneRttWriteCipherResult.hasError()) {
|
||
return folly::makeUnexpected(oneRttWriteCipherResult.error());
|
||
}
|
||
auto oneRttWriteCipher = std::move(oneRttWriteCipherResult.value());
|
||
|
||
// One RTT read cipher is available after cfin is processed.
|
||
auto oneRttReadCipherResult = handshakeLayer->getFirstOneRttReadCipher();
|
||
if (oneRttReadCipherResult.hasError()) {
|
||
return folly::makeUnexpected(oneRttReadCipherResult.error());
|
||
}
|
||
auto oneRttReadCipher = std::move(oneRttReadCipherResult.value());
|
||
|
||
auto oneRttWriteHeaderCipherResult =
|
||
handshakeLayer->getOneRttWriteHeaderCipher();
|
||
if (oneRttWriteHeaderCipherResult.hasError()) {
|
||
return folly::makeUnexpected(oneRttWriteHeaderCipherResult.error());
|
||
}
|
||
auto oneRttWriteHeaderCipher =
|
||
std::move(oneRttWriteHeaderCipherResult.value());
|
||
|
||
auto oneRttReadHeaderCipherResult =
|
||
handshakeLayer->getOneRttReadHeaderCipher();
|
||
if (oneRttReadHeaderCipherResult.hasError()) {
|
||
return folly::makeUnexpected(oneRttReadHeaderCipherResult.error());
|
||
}
|
||
auto oneRttReadHeaderCipher = std::move(oneRttReadHeaderCipherResult.value());
|
||
|
||
if (zeroRttReadCipher) {
|
||
conn.usedZeroRtt = true;
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addTransportStateUpdate(kDerivedZeroRttReadCipher);
|
||
}
|
||
conn.readCodec->setZeroRttReadCipher(std::move(zeroRttReadCipher));
|
||
}
|
||
if (zeroRttHeaderCipher) {
|
||
conn.readCodec->setZeroRttHeaderCipher(std::move(zeroRttHeaderCipher));
|
||
}
|
||
if (oneRttWriteHeaderCipher) {
|
||
conn.oneRttWriteHeaderCipher = std::move(oneRttWriteHeaderCipher);
|
||
}
|
||
if (oneRttReadHeaderCipher) {
|
||
conn.readCodec->setOneRttHeaderCipher(std::move(oneRttReadHeaderCipher));
|
||
}
|
||
|
||
if (oneRttWriteCipher) {
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addTransportStateUpdate(kDerivedOneRttWriteCipher);
|
||
}
|
||
if (conn.oneRttWriteCipher) {
|
||
return folly::makeUnexpected(QuicError(
|
||
TransportErrorCode::CRYPTO_ERROR, "Duplicate 1-rtt write cipher"));
|
||
}
|
||
conn.oneRttWriteCipher = std::move(oneRttWriteCipher);
|
||
conn.oneRttWritePhase = ProtectionType::KeyPhaseZero;
|
||
|
||
updatePacingOnKeyEstablished(conn);
|
||
|
||
// We negotiate the transport parameters whenever we have the 1-RTT write
|
||
// keys available.
|
||
auto clientParams = handshakeLayer->getClientTransportParams();
|
||
if (!clientParams) {
|
||
return folly::makeUnexpected(QuicError(
|
||
TransportErrorCode::TRANSPORT_PARAMETER_ERROR,
|
||
"No client transport params"));
|
||
}
|
||
auto result = processClientInitialParams(conn, *clientParams);
|
||
if (result.hasError()) {
|
||
return result;
|
||
}
|
||
updateNegotiatedAckFeatures(conn);
|
||
}
|
||
if (oneRttReadCipher) {
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addTransportStateUpdate(kDerivedOneRttReadCipher);
|
||
}
|
||
// Clear limit because CFIN is received at this point
|
||
conn.isClientAddrVerified = true;
|
||
conn.writableBytesLimit.reset();
|
||
conn.readCodec->setOneRttReadCipher(std::move(oneRttReadCipher));
|
||
auto nextOneRttReadCipherResult = handshakeLayer->getNextOneRttReadCipher();
|
||
if (nextOneRttReadCipherResult.hasError()) {
|
||
return folly::makeUnexpected(nextOneRttReadCipherResult.error());
|
||
}
|
||
conn.readCodec->setNextOneRttReadCipher(
|
||
std::move(nextOneRttReadCipherResult.value()));
|
||
}
|
||
auto handshakeReadCipherResult = handshakeLayer->getHandshakeReadCipher();
|
||
if (handshakeReadCipherResult.hasError()) {
|
||
return folly::makeUnexpected(handshakeReadCipherResult.error());
|
||
}
|
||
auto handshakeReadCipher = std::move(handshakeReadCipherResult.value());
|
||
|
||
auto handshakeReadHeaderCipherResult =
|
||
handshakeLayer->getHandshakeReadHeaderCipher();
|
||
if (handshakeReadHeaderCipherResult.hasError()) {
|
||
return folly::makeUnexpected(handshakeReadHeaderCipherResult.error());
|
||
}
|
||
auto handshakeReadHeaderCipher =
|
||
std::move(handshakeReadHeaderCipherResult.value());
|
||
|
||
if (handshakeReadCipher) {
|
||
CHECK(handshakeReadHeaderCipher);
|
||
conn.readCodec->setHandshakeReadCipher(std::move(handshakeReadCipher));
|
||
conn.readCodec->setHandshakeHeaderCipher(
|
||
std::move(handshakeReadHeaderCipher));
|
||
}
|
||
if (handshakeLayer->isHandshakeDone()) {
|
||
CHECK(conn.oneRttWriteCipher);
|
||
if (!conn.sentHandshakeDone) {
|
||
sendSimpleFrame(conn, HandshakeDoneFrame());
|
||
conn.sentHandshakeDone = true;
|
||
maybeUpdateTransportFromAppToken(
|
||
conn, conn.serverHandshakeLayer->getAppToken());
|
||
}
|
||
|
||
if (!conn.sentNewTokenFrame &&
|
||
conn.transportSettings.retryTokenSecret.has_value()) {
|
||
// Create NewToken struct – defaults timestamp to now
|
||
NewToken token(conn.peerAddress.getIPAddress());
|
||
|
||
// Encrypt two tuple -> (clientIp, curTimeInMs)
|
||
TokenGenerator generator(conn.transportSettings.retryTokenSecret.value());
|
||
auto encryptedToken = generator.encryptToken(token);
|
||
CHECK(encryptedToken.has_value());
|
||
|
||
sendSimpleFrame(conn, NewTokenFrame(std::move(encryptedToken.value())));
|
||
QUIC_STATS(conn.statsCallback, onNewTokenIssued);
|
||
|
||
conn.sentNewTokenFrame = true;
|
||
}
|
||
}
|
||
return folly::unit;
|
||
}
|
||
|
||
bool validateAndUpdateSourceToken(
|
||
QuicServerConnectionState& conn,
|
||
std::vector<folly::IPAddress> sourceAddresses) {
|
||
DCHECK(conn.peerAddress.isInitialized());
|
||
bool foundMatch = false;
|
||
for (int ii = sourceAddresses.size() - 1; ii >= 0; --ii) {
|
||
// TODO T33014230 subnet matching
|
||
if (conn.peerAddress.getIPAddress() == sourceAddresses[ii]) {
|
||
foundMatch = true;
|
||
// If peer address is found in the token, move the element to the end
|
||
// of vector to increase its favorability.
|
||
sourceAddresses.erase(sourceAddresses.begin() + ii);
|
||
sourceAddresses.push_back(conn.peerAddress.getIPAddress());
|
||
conn.isClientAddrVerified = true;
|
||
}
|
||
}
|
||
conn.sourceTokenMatching = foundMatch;
|
||
bool acceptZeroRtt =
|
||
(conn.transportSettings.zeroRttSourceTokenMatchingPolicy !=
|
||
ZeroRttSourceTokenMatchingPolicy::ALWAYS_REJECT) &&
|
||
foundMatch;
|
||
|
||
if (!foundMatch) {
|
||
// Add peer address to token for next resumption
|
||
if (sourceAddresses.size() >= kMaxNumTokenSourceAddresses) {
|
||
sourceAddresses.erase(sourceAddresses.begin());
|
||
}
|
||
sourceAddresses.push_back(conn.peerAddress.getIPAddress());
|
||
|
||
switch (conn.transportSettings.zeroRttSourceTokenMatchingPolicy) {
|
||
case ZeroRttSourceTokenMatchingPolicy::ALWAYS_REJECT:
|
||
case ZeroRttSourceTokenMatchingPolicy::REJECT_IF_NO_EXACT_MATCH:
|
||
acceptZeroRtt = false;
|
||
break;
|
||
case ZeroRttSourceTokenMatchingPolicy::LIMIT_IF_NO_EXACT_MATCH:
|
||
acceptZeroRtt = true;
|
||
conn.writableBytesLimit =
|
||
conn.transportSettings.limitedCwndInMss * conn.udpSendPacketLen;
|
||
break;
|
||
}
|
||
}
|
||
// Save the source token so that it can be written to client via NST later
|
||
conn.tokenSourceAddresses = std::move(sourceAddresses);
|
||
|
||
return acceptZeroRtt;
|
||
}
|
||
|
||
void updateWritableByteLimitOnRecvPacket(QuicServerConnectionState& conn) {
|
||
// When we receive a packet we increase the limit again. The reasoning this is
|
||
// that a peer can do the same by opening a new connection.
|
||
if (conn.writableBytesLimit) {
|
||
conn.writableBytesLimit = *conn.writableBytesLimit +
|
||
conn.transportSettings.limitedCwndInMss * conn.udpSendPacketLen;
|
||
} else if (
|
||
!conn.isClientAddrVerified &&
|
||
conn.transportSettings.enableWritableBytesLimit) {
|
||
conn.writableBytesLimit =
|
||
conn.transportSettings.limitedCwndInMss * conn.udpSendPacketLen;
|
||
}
|
||
}
|
||
|
||
void maybeUpdateTransportFromAppToken(
|
||
QuicServerConnectionState& conn,
|
||
const Optional<BufPtr>& tokenBuf) {
|
||
if (!tokenBuf) {
|
||
return;
|
||
}
|
||
auto appToken = decodeAppToken(*tokenBuf.value());
|
||
if (!appToken) {
|
||
VLOG(10) << "Failed to decode app token";
|
||
return;
|
||
}
|
||
auto& params = appToken->transportParams.parameters;
|
||
auto maybeCwndHintBytes =
|
||
getIntegerParameter(TransportParameterId::cwnd_hint_bytes, params);
|
||
if (maybeCwndHintBytes) {
|
||
QUIC_STATS(conn.statsCallback, onCwndHintBytesSample, *maybeCwndHintBytes);
|
||
|
||
// Only use the cwndHint if the source address is included in the token
|
||
DCHECK(conn.peerAddress.isInitialized());
|
||
auto addressMatches =
|
||
std::find(
|
||
appToken->sourceAddresses.begin(),
|
||
appToken->sourceAddresses.end(),
|
||
conn.peerAddress.getIPAddress()) != appToken->sourceAddresses.end();
|
||
if (addressMatches) {
|
||
conn.maybeCwndHintBytes = maybeCwndHintBytes;
|
||
}
|
||
}
|
||
}
|
||
|
||
folly::Expected<folly::Unit, QuicError> onConnectionMigration(
|
||
QuicServerConnectionState& conn,
|
||
const folly::SocketAddress& newPeerAddress,
|
||
bool isIntentional) {
|
||
if (conn.migrationState.numMigrations >=
|
||
conn.transportSettings.maxNumMigrationsAllowed) {
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(
|
||
0,
|
||
PacketDropReason(PacketDropReason::PEER_ADDRESS_CHANGE)._to_string());
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback,
|
||
onPacketDropped,
|
||
PacketDropReason::PEER_ADDRESS_CHANGE);
|
||
return folly::makeUnexpected(QuicError(
|
||
TransportErrorCode::INVALID_MIGRATION, "Too many migrations"));
|
||
}
|
||
|
||
bool hasPendingPathChallenge = conn.pendingEvents.pathChallenge.has_value();
|
||
// Clear any pending path challenge frame that is not sent
|
||
conn.pendingEvents.pathChallenge.reset();
|
||
|
||
auto& previousPeerAddresses = conn.migrationState.previousPeerAddresses;
|
||
auto it = std::find(
|
||
previousPeerAddresses.begin(),
|
||
previousPeerAddresses.end(),
|
||
newPeerAddress);
|
||
if (it == previousPeerAddresses.end()) {
|
||
++conn.migrationState.numMigrations;
|
||
// send new path challenge
|
||
conn.pendingEvents.pathChallenge.emplace(folly::Random::secureRand64());
|
||
|
||
// If we are already in the middle of a migration reset
|
||
// the available bytes in the rate-limited window, but keep the
|
||
// window.
|
||
conn.pathValidationLimiter =
|
||
std::make_unique<PendingPathRateLimiter>(conn.udpSendPacketLen);
|
||
} else {
|
||
previousPeerAddresses.erase(it);
|
||
}
|
||
|
||
// At this point, path validation scheduled, writable bytes limit set
|
||
// However if this is NAT rebinding, keep congestion state unchanged
|
||
bool isNATRebinding = maybeNATRebinding(newPeerAddress, conn.peerAddress);
|
||
|
||
// Cancel current path validation if any
|
||
if (hasPendingPathChallenge || conn.outstandingPathValidation) {
|
||
conn.pendingEvents.schedulePathValidationTimeout = false;
|
||
conn.outstandingPathValidation.reset();
|
||
|
||
// Only change congestion & rtt state if not NAT rebinding
|
||
if (!isNATRebinding) {
|
||
recoverOrResetCongestionAndRttState(conn, newPeerAddress);
|
||
}
|
||
} else {
|
||
// Only add validated addresses to previousPeerAddresses
|
||
conn.migrationState.previousPeerAddresses.push_back(conn.peerAddress);
|
||
|
||
// Only change congestion & rtt state if not NAT rebinding
|
||
if (!isNATRebinding) {
|
||
// Current peer address is validated,
|
||
// remember its congestion state and rtt stats
|
||
CongestionAndRttState state = moveCurrentCongestionAndRttState(conn);
|
||
recoverOrResetCongestionAndRttState(conn, newPeerAddress);
|
||
conn.migrationState.lastCongestionAndRtt = std::move(state);
|
||
}
|
||
}
|
||
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addConnectionMigrationUpdate(isIntentional);
|
||
}
|
||
conn.peerAddress = newPeerAddress;
|
||
return folly::unit;
|
||
}
|
||
|
||
folly::Expected<folly::Unit, QuicError> onServerReadData(
|
||
QuicServerConnectionState& conn,
|
||
ServerEvents::ReadData& readData) {
|
||
switch (conn.state) {
|
||
case ServerState::Open:
|
||
return onServerReadDataFromOpen(conn, readData);
|
||
case ServerState::Closed:
|
||
return onServerReadDataFromClosed(conn, readData);
|
||
}
|
||
folly::assume_unreachable();
|
||
}
|
||
|
||
static void handleCipherUnavailable(
|
||
CipherUnavailable* originalData,
|
||
QuicServerConnectionState& conn,
|
||
size_t packetSize,
|
||
ServerEvents::ReadData& readData) {
|
||
if (!originalData->packet || originalData->packet->empty()) {
|
||
VLOG(10) << "drop because no data " << conn;
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(packetSize, kNoData);
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback, onPacketDropped, PacketDropReason::EMPTY_DATA);
|
||
return;
|
||
}
|
||
if (originalData->protectionType != ProtectionType::ZeroRtt &&
|
||
originalData->protectionType != ProtectionType::KeyPhaseZero) {
|
||
VLOG(10) << "drop because unexpected protection level " << conn;
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(packetSize, kUnexpectedProtectionLevel);
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback,
|
||
onPacketDropped,
|
||
PacketDropReason::UNEXPECTED_PROTECTION_LEVEL);
|
||
return;
|
||
}
|
||
|
||
size_t combinedSize =
|
||
(conn.pendingZeroRttData ? conn.pendingZeroRttData->size() : 0) +
|
||
(conn.pendingOneRttData ? conn.pendingOneRttData->size() : 0);
|
||
if (combinedSize >= conn.transportSettings.maxPacketsToBuffer) {
|
||
VLOG(10) << "drop because max buffered " << conn;
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(packetSize, kMaxBuffered);
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback, onPacketDropped, PacketDropReason::MAX_BUFFERED);
|
||
return;
|
||
}
|
||
|
||
auto& pendingData = originalData->protectionType == ProtectionType::ZeroRtt
|
||
? conn.pendingZeroRttData
|
||
: conn.pendingOneRttData;
|
||
if (pendingData) {
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketBuffered(originalData->protectionType, packetSize);
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback,
|
||
onPacketDropped,
|
||
PacketDropReason::PARSE_ERROR_PACKET_BUFFERED);
|
||
ServerEvents::ReadData pendingReadData;
|
||
pendingReadData.peer = readData.peer;
|
||
pendingReadData.udpPacket = ReceivedUdpPacket(
|
||
std::move(originalData->packet),
|
||
readData.udpPacket.timings,
|
||
readData.udpPacket.tosValue);
|
||
pendingData->emplace_back(std::move(pendingReadData));
|
||
VLOG(10) << "Adding pending data to "
|
||
<< toString(originalData->protectionType)
|
||
<< " buffer size=" << pendingData->size() << " " << conn;
|
||
} else {
|
||
VLOG(10) << "drop because " << toString(originalData->protectionType)
|
||
<< " buffer no longer available " << conn;
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(packetSize, kBufferUnavailable);
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback,
|
||
onPacketDropped,
|
||
PacketDropReason::BUFFER_UNAVAILABLE);
|
||
return;
|
||
}
|
||
}
|
||
|
||
folly::Expected<folly::Unit, QuicError> onServerReadDataFromOpen(
|
||
QuicServerConnectionState& conn,
|
||
ServerEvents::ReadData& readData) {
|
||
CHECK_EQ(conn.state, ServerState::Open);
|
||
|
||
if (readData.udpPacket.buf.empty()) {
|
||
return folly::unit;
|
||
}
|
||
bool firstPacketFromPeer = false;
|
||
if (!conn.readCodec) {
|
||
firstPacketFromPeer = true;
|
||
Cursor cursor(readData.udpPacket.buf.front());
|
||
auto initialByte = cursor.readBE<uint8_t>();
|
||
auto parsedLongHeader = parseLongHeaderInvariant(initialByte, cursor);
|
||
if (!parsedLongHeader) {
|
||
VLOG(4) << "Could not parse initial packet header";
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(
|
||
0,
|
||
PacketDropReason(PacketDropReason::PARSE_ERROR_LONG_HEADER_INITIAL)
|
||
._to_string());
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback,
|
||
onPacketDropped,
|
||
PacketDropReason::PARSE_ERROR_LONG_HEADER_INITIAL);
|
||
return folly::unit;
|
||
}
|
||
QuicVersion version = parsedLongHeader->invariant.version;
|
||
if (version == QuicVersion::VERSION_NEGOTIATION) {
|
||
VLOG(4) << "Server dropping VN packet";
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(
|
||
0,
|
||
PacketDropReason(PacketDropReason::INVALID_PACKET_VN)._to_string());
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback,
|
||
onPacketDropped,
|
||
PacketDropReason::INVALID_PACKET_VN);
|
||
return folly::unit;
|
||
}
|
||
|
||
const auto& clientConnectionId = parsedLongHeader->invariant.srcConnId;
|
||
const auto& initialDestinationConnectionId =
|
||
parsedLongHeader->invariant.dstConnId;
|
||
|
||
if (initialDestinationConnectionId.size() < kDefaultConnectionIdSize) {
|
||
VLOG(4) << "Initial connectionid too small";
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(
|
||
0,
|
||
PacketDropReason(PacketDropReason::INITIAL_CONNID_SMALL)
|
||
._to_string());
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback,
|
||
onPacketDropped,
|
||
PacketDropReason::INITIAL_CONNID_SMALL);
|
||
return folly::makeUnexpected(QuicError(
|
||
TransportErrorCode::PROTOCOL_VIOLATION,
|
||
"Initial destination connectionid too small"));
|
||
}
|
||
|
||
CHECK(conn.connIdAlgo) << "ConnectionIdAlgo is not set.";
|
||
CHECK(!conn.serverConnectionId.has_value());
|
||
CHECK(conn.serverConnIdParams);
|
||
|
||
auto newServerConnIdData = conn.createAndAddNewSelfConnId();
|
||
CHECK(newServerConnIdData.has_value());
|
||
conn.serverConnectionId = newServerConnIdData->connId;
|
||
|
||
auto customTransportParams = getSupportedExtTransportParams(conn);
|
||
|
||
QUIC_STATS(conn.statsCallback, onStatelessReset);
|
||
conn.serverHandshakeLayer->accept(
|
||
std::make_shared<ServerTransportParametersExtension>(
|
||
version,
|
||
conn.transportSettings.advertisedInitialConnectionFlowControlWindow,
|
||
conn.transportSettings
|
||
.advertisedInitialBidiLocalStreamFlowControlWindow,
|
||
conn.transportSettings
|
||
.advertisedInitialBidiRemoteStreamFlowControlWindow,
|
||
conn.transportSettings.advertisedInitialUniStreamFlowControlWindow,
|
||
conn.transportSettings.advertisedInitialMaxStreamsBidi,
|
||
conn.transportSettings.advertisedInitialMaxStreamsUni,
|
||
conn.transportSettings.disableMigration,
|
||
conn.transportSettings.idleTimeout,
|
||
conn.transportSettings.ackDelayExponent,
|
||
conn.transportSettings.maxRecvPacketSize,
|
||
*newServerConnIdData->token,
|
||
conn.serverConnectionId.value(),
|
||
initialDestinationConnectionId,
|
||
customTransportParams));
|
||
conn.transportParametersEncoded = true;
|
||
const CryptoFactory& cryptoFactory =
|
||
conn.serverHandshakeLayer->getCryptoFactory();
|
||
conn.readCodec = std::make_unique<QuicReadCodec>(QuicNodeType::Server);
|
||
conn.readCodec->setConnectionStatsCallback(conn.statsCallback);
|
||
conn.readCodec->setInitialReadCipher(cryptoFactory.getClientInitialCipher(
|
||
initialDestinationConnectionId, version));
|
||
conn.readCodec->setClientConnectionId(clientConnectionId);
|
||
conn.readCodec->setServerConnectionId(*conn.serverConnectionId);
|
||
if (conn.qLogger) {
|
||
conn.qLogger->setScid(conn.serverConnectionId);
|
||
conn.qLogger->setDcid(initialDestinationConnectionId);
|
||
}
|
||
conn.readCodec->setCodecParameters(CodecParameters(
|
||
conn.peerAckDelayExponent,
|
||
version,
|
||
conn.transportSettings.maybeAckReceiveTimestampsConfigSentToPeer,
|
||
conn.transportSettings.advertisedExtendedAckFeatures));
|
||
conn.initialWriteCipher = cryptoFactory.getServerInitialCipher(
|
||
initialDestinationConnectionId, version);
|
||
|
||
conn.readCodec->setInitialHeaderCipher(
|
||
cryptoFactory.makeClientInitialHeaderCipher(
|
||
initialDestinationConnectionId, version));
|
||
conn.initialHeaderCipher = cryptoFactory.makeServerInitialHeaderCipher(
|
||
initialDestinationConnectionId, version);
|
||
conn.peerAddress = conn.originalPeerAddress;
|
||
}
|
||
BufQueue& udpData = readData.udpPacket.buf;
|
||
uint64_t processedPacketsTotal = 0;
|
||
for (uint16_t processedPackets = 0;
|
||
!udpData.empty() && processedPackets < kMaxNumCoalescedPackets;
|
||
processedPackets++) {
|
||
size_t dataSize = udpData.chainLength();
|
||
auto parsedPacket = conn.readCodec->parsePacket(udpData, conn.ackStates);
|
||
size_t packetSize = dataSize - udpData.chainLength();
|
||
|
||
switch (parsedPacket.type()) {
|
||
case CodecResult::Type::CIPHER_UNAVAILABLE: {
|
||
handleCipherUnavailable(
|
||
parsedPacket.cipherUnavailable(), conn, packetSize, readData);
|
||
break;
|
||
}
|
||
case CodecResult::Type::RETRY: {
|
||
VLOG(10) << "drop because the server is not supposed to "
|
||
<< "receive a retry " << conn;
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(packetSize, kRetry);
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback,
|
||
onPacketDropped,
|
||
PacketDropReason::UNEXPECTED_RETRY);
|
||
break;
|
||
}
|
||
case CodecResult::Type::STATELESS_RESET: {
|
||
VLOG(10) << "drop because reset " << conn;
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(packetSize, kReset);
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback,
|
||
onPacketDropped,
|
||
PacketDropReason::UNEXPECTED_RESET);
|
||
return folly::unit;
|
||
}
|
||
case CodecResult::Type::NOTHING: {
|
||
VLOG(10) << "drop no data, reason: "
|
||
<< parsedPacket.nothing()->reason._to_string() << " " << conn;
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(
|
||
packetSize, parsedPacket.nothing()->reason._to_string());
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback,
|
||
onPacketDropped,
|
||
parsedPacket.nothing()->reason);
|
||
if (firstPacketFromPeer) {
|
||
return folly::makeUnexpected(QuicError(
|
||
LocalErrorCode::CONNECTION_ABANDONED,
|
||
"Failed to decrypt first packet from peer"));
|
||
}
|
||
break;
|
||
}
|
||
case CodecResult::Type::CODEC_ERROR: {
|
||
return folly::makeUnexpected(parsedPacket.codecError()->error);
|
||
}
|
||
case CodecResult::Type::REGULAR_PACKET:
|
||
break;
|
||
}
|
||
|
||
RegularQuicPacket* regularOptional = parsedPacket.regularPacket();
|
||
if (!regularOptional) {
|
||
// We were unable to parse the packet, drop for now. All the drop reasons
|
||
// should have already been logged into QLogger and QuicTrace inside the
|
||
// previous switch-case block. All stats have already been updated.
|
||
VLOG(10) << "Not able to parse QUIC packet " << conn;
|
||
continue;
|
||
}
|
||
if (regularOptional->frames.empty()) {
|
||
// This packet had a pareseable header (most probably short header)
|
||
// but no data. This is a protocol violation so we return an error.
|
||
// This drop has not been recorded in the switch-case block above
|
||
// so we record it here.
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(
|
||
packetSize,
|
||
PacketDropReason(PacketDropReason::PROTOCOL_VIOLATION)
|
||
._to_string());
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback,
|
||
onPacketDropped,
|
||
PacketDropReason::PROTOCOL_VIOLATION);
|
||
return folly::makeUnexpected(QuicError(
|
||
TransportErrorCode::PROTOCOL_VIOLATION, "Packet has no frames"));
|
||
}
|
||
|
||
auto protectionLevel = regularOptional->header.getProtectionType();
|
||
auto encryptionLevel = protectionTypeToEncryptionLevel(protectionLevel);
|
||
|
||
auto packetNum = regularOptional->header.getPacketSequenceNum();
|
||
auto packetNumberSpace = regularOptional->header.getPacketNumberSpace();
|
||
|
||
auto& regularPacket = *regularOptional;
|
||
|
||
bool isProtectedPacket = protectionLevel == ProtectionType::ZeroRtt ||
|
||
protectionLevel == ProtectionType::KeyPhaseZero ||
|
||
protectionLevel == ProtectionType::KeyPhaseOne;
|
||
|
||
bool isZeroRttPacket = protectionLevel == ProtectionType::ZeroRtt;
|
||
|
||
bool isQuicInitialPacket =
|
||
regularPacket.header.getHeaderForm() == HeaderForm::Long &&
|
||
regularPacket.header.asLong()->getHeaderType() ==
|
||
LongHeader::Types::Initial;
|
||
|
||
if (isQuicInitialPacket) {
|
||
++conn.initialPacketsReceived;
|
||
}
|
||
|
||
if (!isProtectedPacket || isZeroRttPacket) {
|
||
auto isFrameInvalidFn = !isProtectedPacket
|
||
? isUnprotectedPacketFrameInvalid
|
||
: isZeroRttPacketFrameInvalid;
|
||
for (auto& quicFrame : regularPacket.frames) {
|
||
bool isFrameInvalid = isFrameInvalidFn(quicFrame);
|
||
if (isFrameInvalid) {
|
||
QUIC_STATS(
|
||
conn.statsCallback,
|
||
onPacketDropped,
|
||
PacketDropReason::PROTOCOL_VIOLATION);
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(
|
||
packetSize,
|
||
PacketDropReason(PacketDropReason::PROTOCOL_VIOLATION)
|
||
._to_string());
|
||
}
|
||
return folly::makeUnexpected(QuicError(
|
||
TransportErrorCode::PROTOCOL_VIOLATION,
|
||
"Invalid frame received"));
|
||
}
|
||
}
|
||
}
|
||
|
||
CHECK(conn.clientConnectionId);
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacket(regularPacket, packetSize);
|
||
}
|
||
|
||
if (!conn.version) {
|
||
LongHeader* longHeader = regularPacket.header.asLong();
|
||
if (!longHeader) {
|
||
return folly::makeUnexpected(QuicError(
|
||
TransportErrorCode::PROTOCOL_VIOLATION,
|
||
"Invalid packet type (expected LongHeader)"));
|
||
}
|
||
conn.version = longHeader->getVersion();
|
||
maybeSetExperimentalSettings(conn);
|
||
}
|
||
|
||
if (conn.peerAddress != readData.peer) {
|
||
QUIC_STATS(conn.statsCallback, onPeerAddressChanged);
|
||
auto migrationDenied = (encryptionLevel != EncryptionLevel::AppData) ||
|
||
conn.transportSettings.disableMigration;
|
||
if (migrationDenied) {
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(
|
||
packetSize,
|
||
PacketDropReason(PacketDropReason::PEER_ADDRESS_CHANGE)
|
||
._to_string());
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback,
|
||
onPacketDropped,
|
||
PacketDropReason::PEER_ADDRESS_CHANGE);
|
||
if (!conn.transportSettings.closeIfMigrationDuringHandshake) {
|
||
continue;
|
||
}
|
||
const char* errMsg = encryptionLevel != EncryptionLevel::AppData
|
||
? "Migration not allowed during handshake"
|
||
: "Migration disabled";
|
||
return folly::makeUnexpected(
|
||
QuicError(TransportErrorCode::INVALID_MIGRATION, errMsg));
|
||
}
|
||
}
|
||
|
||
auto& ackState = getAckState(conn, packetNumberSpace);
|
||
uint64_t distanceFromExpectedPacketNum =
|
||
addPacketToAckState(conn, ackState, packetNum, readData.udpPacket);
|
||
if (distanceFromExpectedPacketNum > 0) {
|
||
QUIC_STATS(conn.statsCallback, onOutOfOrderPacketReceived);
|
||
}
|
||
DCHECK(hasReceivedUdpPackets(conn));
|
||
|
||
bool pktHasRetransmittableData = false;
|
||
bool pktHasCryptoData = false;
|
||
bool isNonProbingPacket = false;
|
||
bool handshakeConfirmedThisLoop = false;
|
||
|
||
AckedPacketVisitor ackedPacketVisitor =
|
||
[&](const OutstandingPacketWrapper& outstandingPacket) {
|
||
return maybeVerifyPendingKeyUpdate(
|
||
conn, outstandingPacket, regularPacket);
|
||
};
|
||
AckedFrameVisitor ackedFrameVisitor = [&](const OutstandingPacketWrapper&,
|
||
const QuicWriteFrame& packetFrame)
|
||
-> folly::Expected<folly::Unit, QuicError> {
|
||
switch (packetFrame.type()) {
|
||
case QuicWriteFrame::Type::WriteStreamFrame: {
|
||
const WriteStreamFrame& frame = *packetFrame.asWriteStreamFrame();
|
||
VLOG(4) << "Server received ack for stream=" << frame.streamId
|
||
<< " offset=" << frame.offset << " fin=" << frame.fin
|
||
<< " len=" << frame.len << " " << conn;
|
||
auto ackedStream =
|
||
conn.streamManager->getStream(frame.streamId).value_or(nullptr);
|
||
if (ackedStream) {
|
||
auto result = sendAckSMHandler(*ackedStream, frame);
|
||
if (result.hasError()) {
|
||
return folly::makeUnexpected(result.error());
|
||
}
|
||
}
|
||
break;
|
||
}
|
||
case QuicWriteFrame::Type::WriteCryptoFrame: {
|
||
const WriteCryptoFrame& frame = *packetFrame.asWriteCryptoFrame();
|
||
auto cryptoStream =
|
||
getCryptoStream(*conn.cryptoState, encryptionLevel);
|
||
processCryptoStreamAck(*cryptoStream, frame.offset, frame.len);
|
||
break;
|
||
}
|
||
case QuicWriteFrame::Type::RstStreamFrame: {
|
||
const RstStreamFrame& frame = *packetFrame.asRstStreamFrame();
|
||
VLOG(4) << "Server received ack for reset stream=" << frame.streamId
|
||
<< " " << conn;
|
||
auto stream =
|
||
conn.streamManager->getStream(frame.streamId).value_or(nullptr);
|
||
if (stream) {
|
||
auto result = sendRstAckSMHandler(*stream, frame.reliableSize);
|
||
if (result.hasError()) {
|
||
return folly::makeUnexpected(result.error());
|
||
}
|
||
}
|
||
break;
|
||
}
|
||
case QuicWriteFrame::Type::WriteAckFrame: {
|
||
const WriteAckFrame& frame = *packetFrame.asWriteAckFrame();
|
||
DCHECK(!frame.ackBlocks.empty());
|
||
VLOG(4) << "Server received ack for largestAcked="
|
||
<< frame.ackBlocks.front().end << " " << conn;
|
||
commonAckVisitorForAckFrame(ackState, frame);
|
||
break;
|
||
}
|
||
case QuicWriteFrame::Type::PingFrame:
|
||
conn.pendingEvents.cancelPingTimeout = true;
|
||
break;
|
||
case QuicWriteFrame::Type::QuicSimpleFrame: {
|
||
const QuicSimpleFrame& frame = *packetFrame.asQuicSimpleFrame();
|
||
// ACK of HandshakeDone is a server-specific behavior.
|
||
if (frame.asHandshakeDoneFrame()) {
|
||
// Call handshakeConfirmed outside of the packet
|
||
// processing loop to avoid a re-entrancy.
|
||
handshakeConfirmedThisLoop = true;
|
||
}
|
||
break;
|
||
}
|
||
default: {
|
||
break;
|
||
}
|
||
}
|
||
return folly::unit;
|
||
};
|
||
|
||
for (auto& quicFrame : regularPacket.frames) {
|
||
switch (quicFrame.type()) {
|
||
case QuicFrame::Type::ReadAckFrame: {
|
||
VLOG(10) << "Server received ack frame packet=" << packetNum << " "
|
||
<< conn;
|
||
isNonProbingPacket = true;
|
||
ReadAckFrame& ackFrame = *quicFrame.asReadAckFrame();
|
||
|
||
if (ackFrame.frameType == FrameType::ACK_EXTENDED &&
|
||
!conn.transportSettings.advertisedExtendedAckFeatures) {
|
||
return folly::makeUnexpected(QuicError(
|
||
TransportErrorCode::PROTOCOL_VIOLATION,
|
||
"Received unexpected ACK_EXTENDED frame"));
|
||
} else if (
|
||
ackFrame.frameType == FrameType::ACK_RECEIVE_TIMESTAMPS &&
|
||
!conn.transportSettings
|
||
.maybeAckReceiveTimestampsConfigSentToPeer) {
|
||
return folly::makeUnexpected(QuicError(
|
||
TransportErrorCode::PROTOCOL_VIOLATION,
|
||
"Received unexpected ACK_RECEIVE_TIMESTAMPS frame"));
|
||
}
|
||
auto result = processAckFrame(
|
||
conn,
|
||
packetNumberSpace,
|
||
ackFrame,
|
||
ackedPacketVisitor,
|
||
ackedFrameVisitor,
|
||
markPacketLoss,
|
||
readData.udpPacket.timings.receiveTimePoint);
|
||
|
||
if (result.hasError()) {
|
||
return folly::makeUnexpected(result.error());
|
||
}
|
||
conn.lastProcessedAckEvents.emplace_back(std::move(result.value()));
|
||
break;
|
||
}
|
||
case QuicFrame::Type::RstStreamFrame: {
|
||
RstStreamFrame& frame = *quicFrame.asRstStreamFrame();
|
||
if (frame.reliableSize.hasValue()) {
|
||
return folly::makeUnexpected(QuicError(
|
||
TransportErrorCode::PROTOCOL_VIOLATION,
|
||
"Reliable resets not supported"));
|
||
}
|
||
VLOG(10) << "Server received reset stream=" << frame.streamId << " "
|
||
<< conn;
|
||
pktHasRetransmittableData = true;
|
||
isNonProbingPacket = true;
|
||
auto streamResult = conn.streamManager->getStream(frame.streamId);
|
||
if (streamResult.hasError()) {
|
||
return folly::makeUnexpected(streamResult.error());
|
||
}
|
||
auto& stream = streamResult.value();
|
||
|
||
if (!stream) {
|
||
break;
|
||
}
|
||
auto result = receiveRstStreamSMHandler(*stream, frame);
|
||
if (result.hasError()) {
|
||
return folly::makeUnexpected(result.error());
|
||
}
|
||
break;
|
||
}
|
||
case QuicFrame::Type::ReadCryptoFrame: {
|
||
pktHasRetransmittableData = true;
|
||
pktHasCryptoData = true;
|
||
isNonProbingPacket = true;
|
||
ReadCryptoFrame& cryptoFrame = *quicFrame.asReadCryptoFrame();
|
||
VLOG(10) << "Server received crypto data offset="
|
||
<< cryptoFrame.offset
|
||
<< " len=" << cryptoFrame.data->computeChainDataLength()
|
||
<< " currentReadOffset="
|
||
<< getCryptoStream(*conn.cryptoState, encryptionLevel);
|
||
auto cryptoStream =
|
||
getCryptoStream(*conn.cryptoState, encryptionLevel);
|
||
auto readBufferSize = cryptoStream->readBuffer.size();
|
||
auto result = appendDataToReadBuffer(
|
||
*cryptoStream,
|
||
StreamBuffer(
|
||
std::move(cryptoFrame.data), cryptoFrame.offset, false));
|
||
if (result.hasError()) {
|
||
return folly::makeUnexpected(result.error());
|
||
}
|
||
if (isQuicInitialPacket &&
|
||
readBufferSize != cryptoStream->readBuffer.size()) {
|
||
++conn.uniqueInitialCryptoFramesReceived;
|
||
conn.cryptoState->lastInitialCryptoFrameReceivedTimePoint =
|
||
Clock::now();
|
||
}
|
||
break;
|
||
}
|
||
case QuicFrame::Type::ReadStreamFrame: {
|
||
ReadStreamFrame& frame = *quicFrame.asReadStreamFrame();
|
||
VLOG(10) << "Server received stream data for stream="
|
||
<< frame.streamId << ", offset=" << frame.offset
|
||
<< " len=" << frame.data->computeChainDataLength()
|
||
<< " fin=" << frame.fin << " " << conn;
|
||
pktHasRetransmittableData = true;
|
||
isNonProbingPacket = true;
|
||
auto streamResult = conn.streamManager->getStream(
|
||
frame.streamId, frame.streamGroupId);
|
||
if (streamResult.hasError()) {
|
||
return folly::makeUnexpected(streamResult.error());
|
||
}
|
||
auto& stream = streamResult.value();
|
||
|
||
if (stream) {
|
||
auto result =
|
||
receiveReadStreamFrameSMHandler(*stream, std::move(frame));
|
||
if (result.hasError()) {
|
||
return folly::makeUnexpected(result.error());
|
||
}
|
||
}
|
||
break;
|
||
}
|
||
case QuicFrame::Type::MaxDataFrame: {
|
||
MaxDataFrame& connWindowUpdate = *quicFrame.asMaxDataFrame();
|
||
VLOG(10) << "Server received max data offset="
|
||
<< connWindowUpdate.maximumData << " " << conn;
|
||
pktHasRetransmittableData = true;
|
||
isNonProbingPacket = true;
|
||
handleConnWindowUpdate(conn, connWindowUpdate, packetNum);
|
||
break;
|
||
}
|
||
case QuicFrame::Type::MaxStreamDataFrame: {
|
||
MaxStreamDataFrame& streamWindowUpdate =
|
||
*quicFrame.asMaxStreamDataFrame();
|
||
VLOG(10) << "Server received max stream data stream="
|
||
<< streamWindowUpdate.streamId
|
||
<< " offset=" << streamWindowUpdate.maximumData << " "
|
||
<< conn;
|
||
if (isReceivingStream(conn.nodeType, streamWindowUpdate.streamId)) {
|
||
return folly::makeUnexpected(QuicError(
|
||
TransportErrorCode::STREAM_STATE_ERROR,
|
||
"Received MaxStreamDataFrame for receiving stream."));
|
||
}
|
||
pktHasRetransmittableData = true;
|
||
isNonProbingPacket = true;
|
||
auto streamResult =
|
||
conn.streamManager->getStream(streamWindowUpdate.streamId);
|
||
if (streamResult.hasError()) {
|
||
return folly::makeUnexpected(streamResult.error());
|
||
}
|
||
auto& stream = streamResult.value();
|
||
if (stream) {
|
||
handleStreamWindowUpdate(
|
||
*stream, streamWindowUpdate.maximumData, packetNum);
|
||
}
|
||
break;
|
||
}
|
||
case QuicFrame::Type::DataBlockedFrame: {
|
||
VLOG(10) << "Server received blocked " << conn;
|
||
pktHasRetransmittableData = true;
|
||
isNonProbingPacket = true;
|
||
handleConnBlocked(conn);
|
||
break;
|
||
}
|
||
case QuicFrame::Type::StreamDataBlockedFrame: {
|
||
StreamDataBlockedFrame& blocked =
|
||
*quicFrame.asStreamDataBlockedFrame();
|
||
VLOG(10) << "Server received blocked stream=" << blocked.streamId
|
||
<< " " << conn;
|
||
pktHasRetransmittableData = true;
|
||
isNonProbingPacket = true;
|
||
auto streamResult = conn.streamManager->getStream(blocked.streamId);
|
||
if (streamResult.hasError()) {
|
||
return folly::makeUnexpected(streamResult.error());
|
||
}
|
||
auto& stream = streamResult.value();
|
||
if (stream) {
|
||
handleStreamBlocked(*stream);
|
||
}
|
||
break;
|
||
}
|
||
case QuicFrame::Type::StreamsBlockedFrame: {
|
||
StreamsBlockedFrame& blocked = *quicFrame.asStreamsBlockedFrame();
|
||
// peer wishes to open a stream, but is unable to due to the maximum
|
||
// stream limit set by us
|
||
// TODO implement the handler
|
||
isNonProbingPacket = true;
|
||
VLOG(10) << "Server received streams blocked limit="
|
||
<< blocked.streamLimit << ", " << conn;
|
||
|
||
break;
|
||
}
|
||
case QuicFrame::Type::ConnectionCloseFrame: {
|
||
isNonProbingPacket = true;
|
||
ConnectionCloseFrame& connFrame = *quicFrame.asConnectionCloseFrame();
|
||
auto errMsg = folly::to<std::string>(
|
||
"Server closed by peer reason=", connFrame.reasonPhrase);
|
||
VLOG(4) << errMsg << " " << conn;
|
||
// 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));
|
||
}
|
||
conn.peerConnectionError =
|
||
QuicError(QuicErrorCode(connFrame.errorCode), std::move(errMsg));
|
||
if (getSendConnFlowControlBytesWire(conn) == 0 &&
|
||
conn.flowControlState.sumCurStreamBufferLen) {
|
||
VLOG(2) << "Client gives up a flow control blocked connection";
|
||
}
|
||
return folly::unit;
|
||
}
|
||
case QuicFrame::Type::PingFrame:
|
||
isNonProbingPacket = true;
|
||
// Ping isn't retransmittable data. But we would like to ack them
|
||
// early.
|
||
pktHasRetransmittableData = true;
|
||
conn.pendingEvents.notifyPingReceived = true;
|
||
break;
|
||
case QuicFrame::Type::PaddingFrame:
|
||
break;
|
||
case QuicFrame::Type::QuicSimpleFrame: {
|
||
auto dstConnId =
|
||
regularPacket.header.getHeaderForm() == HeaderForm::Short
|
||
? regularPacket.header.asShort()->getConnectionId()
|
||
: regularPacket.header.asLong()->getDestinationConnId();
|
||
pktHasRetransmittableData = true;
|
||
QuicSimpleFrame& simpleFrame = *quicFrame.asQuicSimpleFrame();
|
||
auto simpleResult = updateSimpleFrameOnPacketReceived(
|
||
conn, simpleFrame, dstConnId, readData.peer != conn.peerAddress);
|
||
if (simpleResult.hasError()) {
|
||
return folly::makeUnexpected(simpleResult.error());
|
||
}
|
||
isNonProbingPacket |= simpleResult.value();
|
||
break;
|
||
}
|
||
case QuicFrame::Type::DatagramFrame: {
|
||
DatagramFrame& frame = *quicFrame.asDatagramFrame();
|
||
VLOG(10) << "Server received datagram data: " << " len="
|
||
<< frame.length;
|
||
// Datagram isn't retransmittable. But we would like to ack them
|
||
// early. So, make Datagram frames count towards ack policy
|
||
pktHasRetransmittableData = true;
|
||
handleDatagram(
|
||
conn, frame, readData.udpPacket.timings.receiveTimePoint);
|
||
break;
|
||
}
|
||
case QuicFrame::Type::ImmediateAckFrame: {
|
||
if (!conn.transportSettings.minAckDelay.has_value()) {
|
||
return folly::makeUnexpected(QuicError(
|
||
TransportErrorCode::PROTOCOL_VIOLATION,
|
||
"Received IMMEDIATE_ACK frame without announcing min_ack_delay"));
|
||
}
|
||
// Send an ACK from any packet number space.
|
||
if (conn.ackStates.initialAckState) {
|
||
conn.ackStates.initialAckState->needsToSendAckImmediately = true;
|
||
}
|
||
if (conn.ackStates.handshakeAckState) {
|
||
conn.ackStates.handshakeAckState->needsToSendAckImmediately = true;
|
||
}
|
||
conn.ackStates.appDataAckState.needsToSendAckImmediately = true;
|
||
break;
|
||
}
|
||
default: {
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (handshakeConfirmedThisLoop) {
|
||
handshakeConfirmed(conn);
|
||
}
|
||
|
||
maybeScheduleAckForCongestionFeedback(readData.udpPacket, ackState);
|
||
maybeHandleIncomingKeyUpdate(conn);
|
||
|
||
// Update writable limit before processing the handshake data. This is so
|
||
// that if we haven't decided whether or not to validate the peer, we
|
||
// won't increase the limit.
|
||
updateWritableByteLimitOnRecvPacket(conn);
|
||
|
||
if (conn.peerAddress != readData.peer) {
|
||
// TODO use new conn id, make sure the other endpoint has new conn id
|
||
if (isNonProbingPacket) {
|
||
if (packetNum == ackState.largestRecvdPacketNum) {
|
||
ShortHeader* shortHeader = regularPacket.header.asShort();
|
||
bool intentionalMigration = false;
|
||
if (shortHeader &&
|
||
shortHeader->getConnectionId() != conn.serverConnectionId) {
|
||
intentionalMigration = true;
|
||
}
|
||
auto migrationResult =
|
||
onConnectionMigration(conn, readData.peer, intentionalMigration);
|
||
if (migrationResult.hasError()) {
|
||
return folly::makeUnexpected(migrationResult.error());
|
||
}
|
||
}
|
||
} else {
|
||
// Server will need to response with PathResponse to the new address
|
||
// while not updating peerAddress to new address
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(
|
||
packetSize,
|
||
PacketDropReason(PacketDropReason::PEER_ADDRESS_CHANGE)
|
||
._to_string());
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback,
|
||
onPacketDropped,
|
||
PacketDropReason::PEER_ADDRESS_CHANGE);
|
||
return folly::makeUnexpected(QuicError(
|
||
TransportErrorCode::INVALID_MIGRATION,
|
||
"Probing not supported yet"));
|
||
}
|
||
}
|
||
|
||
auto data = readDataFromCryptoStream(
|
||
*getCryptoStream(*conn.cryptoState, encryptionLevel));
|
||
if (data) {
|
||
auto handshakeResult = conn.serverHandshakeLayer->doHandshake(
|
||
std::move(data), encryptionLevel);
|
||
if (handshakeResult.hasError()) {
|
||
return folly::makeUnexpected(handshakeResult.error());
|
||
}
|
||
auto handshakeStateResult = updateHandshakeState(conn);
|
||
if (handshakeStateResult.hasError()) {
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(
|
||
packetSize,
|
||
PacketDropReason(PacketDropReason::TRANSPORT_PARAMETER_ERROR)
|
||
._to_string());
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback,
|
||
onPacketDropped,
|
||
PacketDropReason::TRANSPORT_PARAMETER_ERROR);
|
||
return folly::makeUnexpected(handshakeStateResult.error());
|
||
}
|
||
}
|
||
updateAckSendStateOnRecvPacket(
|
||
conn,
|
||
ackState,
|
||
distanceFromExpectedPacketNum,
|
||
pktHasRetransmittableData,
|
||
pktHasCryptoData,
|
||
packetNumberSpace == PacketNumberSpace::Initial);
|
||
if (encryptionLevel == EncryptionLevel::Handshake &&
|
||
conn.initialWriteCipher) {
|
||
conn.initialWriteCipher.reset();
|
||
conn.initialHeaderCipher.reset();
|
||
conn.readCodec->setInitialReadCipher(nullptr);
|
||
conn.readCodec->setInitialHeaderCipher(nullptr);
|
||
implicitAckCryptoStream(conn, EncryptionLevel::Initial);
|
||
}
|
||
processedPacketsTotal++;
|
||
}
|
||
if (processedPacketsTotal > 0) {
|
||
QUIC_STATS(conn.statsCallback, onPacketsProcessed, processedPacketsTotal);
|
||
}
|
||
VLOG_IF(4, !udpData.empty())
|
||
<< "Leaving " << udpData.chainLength()
|
||
<< " bytes unprocessed after attempting to process "
|
||
<< kMaxNumCoalescedPackets << " packets.";
|
||
|
||
return folly::unit;
|
||
}
|
||
|
||
folly::Expected<folly::Unit, QuicError> onServerReadDataFromClosed(
|
||
QuicServerConnectionState& conn,
|
||
ServerEvents::ReadData& readData) {
|
||
CHECK_EQ(conn.state, ServerState::Closed);
|
||
BufQueue& udpData = readData.udpPacket.buf;
|
||
auto packetSize = udpData.empty() ? 0 : udpData.chainLength();
|
||
if (!conn.readCodec) {
|
||
// drop data. We closed before we even got the first packet. This is
|
||
// normally not possible but might as well.
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(
|
||
packetSize,
|
||
PacketDropReason(PacketDropReason::SERVER_STATE_CLOSED)._to_string());
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback,
|
||
onPacketDropped,
|
||
PacketDropReason::SERVER_STATE_CLOSED);
|
||
return folly::unit;
|
||
}
|
||
|
||
if (conn.peerConnectionError) {
|
||
// We already got a peer error. We can ignore any further peer errors.
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(
|
||
packetSize,
|
||
PacketDropReason(PacketDropReason::SERVER_STATE_CLOSED)._to_string());
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback,
|
||
onPacketDropped,
|
||
PacketDropReason::SERVER_STATE_CLOSED);
|
||
return folly::unit;
|
||
}
|
||
auto parsedPacket = conn.readCodec->parsePacket(udpData, conn.ackStates);
|
||
switch (parsedPacket.type()) {
|
||
case CodecResult::Type::CIPHER_UNAVAILABLE: {
|
||
VLOG(10) << "drop cipher unavailable " << conn;
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(packetSize, kCipherUnavailable);
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback,
|
||
onPacketDropped,
|
||
PacketDropReason::CIPHER_UNAVAILABLE);
|
||
break;
|
||
}
|
||
case CodecResult::Type::RETRY: {
|
||
VLOG(10) << "drop because the server is not supposed to "
|
||
<< "receive a retry " << conn;
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(packetSize, kRetry);
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback,
|
||
onPacketDropped,
|
||
PacketDropReason::UNEXPECTED_RETRY);
|
||
break;
|
||
}
|
||
case CodecResult::Type::STATELESS_RESET: {
|
||
VLOG(10) << "drop because reset " << conn;
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(packetSize, kReset);
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback,
|
||
onPacketDropped,
|
||
PacketDropReason::UNEXPECTED_RESET);
|
||
break;
|
||
}
|
||
case CodecResult::Type::NOTHING: {
|
||
VLOG(10) << "drop no data, reason: "
|
||
<< parsedPacket.nothing()->reason._to_string() << " " << conn;
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(
|
||
packetSize, parsedPacket.nothing()->reason._to_string());
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback, onPacketDropped, parsedPacket.nothing()->reason);
|
||
break;
|
||
}
|
||
case CodecResult::Type::CODEC_ERROR: {
|
||
return folly::makeUnexpected(parsedPacket.codecError()->error);
|
||
}
|
||
case CodecResult::Type::REGULAR_PACKET:
|
||
break;
|
||
}
|
||
auto regularOptional = parsedPacket.regularPacket();
|
||
if (!regularOptional) {
|
||
// We were unable to parse the packet, drop for now.
|
||
// Packet drop has already been added to qlog and stats
|
||
VLOG(10) << "Not able to parse QUIC packet " << conn;
|
||
return folly::unit;
|
||
}
|
||
if (regularOptional->frames.empty()) {
|
||
// This packet had a pareseable header (most probably short header)
|
||
// but no data. This is a protocol violation so we throw an exception.
|
||
// This drop has not been recorded in the switch-case block above
|
||
// so we record it here.
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacketDrop(
|
||
packetSize,
|
||
PacketDropReason(PacketDropReason::PROTOCOL_VIOLATION)._to_string());
|
||
}
|
||
QUIC_STATS(
|
||
conn.statsCallback,
|
||
onPacketDropped,
|
||
PacketDropReason::PROTOCOL_VIOLATION);
|
||
return folly::makeUnexpected(QuicError(
|
||
TransportErrorCode::PROTOCOL_VIOLATION, "Packet has no frames"));
|
||
}
|
||
|
||
auto& regularPacket = *regularOptional;
|
||
auto packetNum = regularPacket.header.getPacketSequenceNum();
|
||
auto pnSpace = regularPacket.header.getPacketNumberSpace();
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addPacket(regularPacket, packetSize);
|
||
}
|
||
|
||
// TODO: Should we honor a key update from the peer on a closed connection?
|
||
|
||
// Only process the close frames in the packet
|
||
for (auto& quicFrame : regularPacket.frames) {
|
||
switch (quicFrame.type()) {
|
||
case QuicFrame::Type::ConnectionCloseFrame: {
|
||
ConnectionCloseFrame& connFrame = *quicFrame.asConnectionCloseFrame();
|
||
auto errMsg = folly::to<std::string>(
|
||
"Server closed by peer reason=", connFrame.reasonPhrase);
|
||
VLOG(4) << errMsg << " " << conn;
|
||
if (conn.qLogger) {
|
||
conn.qLogger->addTransportStateUpdate(getPeerClose(errMsg));
|
||
}
|
||
// we want to deliver app callbacks with the peer supplied error,
|
||
// but send a NO_ERROR to the peer.
|
||
conn.peerConnectionError =
|
||
QuicError(QuicErrorCode(connFrame.errorCode), std::move(errMsg));
|
||
break;
|
||
}
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
|
||
// We only need to set the largest received packet number in order to
|
||
// determine whether or not we need to send a new close.
|
||
auto& largestRecvdPacketNum =
|
||
getAckState(conn, pnSpace).largestRecvdPacketNum;
|
||
largestRecvdPacketNum =
|
||
std::max<PacketNum>(largestRecvdPacketNum.value_or(packetNum), packetNum);
|
||
return folly::unit;
|
||
}
|
||
|
||
void onServerClose(QuicServerConnectionState& conn) {
|
||
switch (conn.state) {
|
||
case ServerState::Open:
|
||
onServerCloseOpenState(conn);
|
||
return;
|
||
case ServerState::Closed:
|
||
return;
|
||
}
|
||
}
|
||
|
||
void onServerCloseOpenState(QuicServerConnectionState& conn) {
|
||
conn.state = ServerState::Closed;
|
||
}
|
||
|
||
Optional<ConnectionIdData>
|
||
QuicServerConnectionState::createAndAddNewSelfConnId() {
|
||
// Should be set right after server transport construction.
|
||
CHECK(connIdAlgo);
|
||
CHECK(serverConnIdParams);
|
||
|
||
CHECK(transportSettings.statelessResetTokenSecret);
|
||
|
||
StatelessResetGenerator generator(
|
||
transportSettings.statelessResetTokenSecret.value(),
|
||
serverAddr.getFullyQualified());
|
||
|
||
// The default connectionId algo has 36 bits of randomness.
|
||
auto encodedCid = connIdAlgo->encodeConnectionId(*serverConnIdParams);
|
||
size_t encodedTimes = 1;
|
||
while (encodedCid && connIdRejector &&
|
||
connIdRejector->rejectConnectionId(*encodedCid) &&
|
||
encodedTimes < kConnIdEncodingRetryLimit) {
|
||
encodedCid = connIdAlgo->encodeConnectionId(*serverConnIdParams);
|
||
encodedTimes++;
|
||
}
|
||
LOG_IF(ERROR, encodedTimes == kConnIdEncodingRetryLimit)
|
||
<< "Quic CIDRejector rejected all conneectionIDs";
|
||
if (encodedCid.hasError()) {
|
||
return none;
|
||
}
|
||
QUIC_STATS(statsCallback, onConnectionIdCreated, encodedTimes);
|
||
auto newConnIdData =
|
||
ConnectionIdData{*encodedCid, nextSelfConnectionIdSequence++};
|
||
newConnIdData.token = generator.generateToken(newConnIdData.connId);
|
||
selfConnectionIds.push_back(newConnIdData);
|
||
return newConnIdData;
|
||
}
|
||
} // namespace quic
|