| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "net/third_party/quiche/src/quic/core/quic_stream.h" |
| |
| #include <string> |
| |
| #include "net/third_party/quiche/src/quic/core/quic_error_codes.h" |
| #include "net/third_party/quiche/src/quic/core/quic_flow_controller.h" |
| #include "net/third_party/quiche/src/quic/core/quic_session.h" |
| #include "net/third_party/quiche/src/quic/core/quic_utils.h" |
| #include "net/third_party/quiche/src/quic/platform/api/quic_bug_tracker.h" |
| #include "net/third_party/quiche/src/quic/platform/api/quic_flag_utils.h" |
| #include "net/third_party/quiche/src/quic/platform/api/quic_flags.h" |
| #include "net/third_party/quiche/src/quic/platform/api/quic_logging.h" |
| #include "net/third_party/quiche/src/quic/platform/api/quic_str_cat.h" |
| |
| using spdy::SpdyPriority; |
| |
| namespace quic { |
| |
| #define ENDPOINT \ |
| (perspective_ == Perspective::IS_SERVER ? "Server: " : "Client: ") |
| |
| namespace { |
| |
| size_t DefaultFlowControlWindow(ParsedQuicVersion version) { |
| if (!version.AllowsLowFlowControlLimits()) { |
| return kDefaultFlowControlSendWindow; |
| } |
| return 0; |
| } |
| |
| size_t GetInitialStreamFlowControlWindowToSend(QuicSession* session, |
| QuicStreamId stream_id) { |
| ParsedQuicVersion version = session->connection()->version(); |
| if (version.handshake_protocol != PROTOCOL_TLS1_3) { |
| return session->config()->GetInitialStreamFlowControlWindowToSend(); |
| } |
| |
| // Unidirectional streams (v99 only). |
| if (VersionHasIetfQuicFrames(version.transport_version) && |
| !QuicUtils::IsBidirectionalStreamId(stream_id)) { |
| return session->config() |
| ->GetInitialMaxStreamDataBytesUnidirectionalToSend(); |
| } |
| |
| if (QuicUtils::IsOutgoingStreamId(version, stream_id, |
| session->perspective())) { |
| return session->config() |
| ->GetInitialMaxStreamDataBytesOutgoingBidirectionalToSend(); |
| } |
| |
| return session->config() |
| ->GetInitialMaxStreamDataBytesIncomingBidirectionalToSend(); |
| } |
| |
| size_t GetReceivedFlowControlWindow(QuicSession* session, |
| QuicStreamId stream_id) { |
| ParsedQuicVersion version = session->connection()->version(); |
| if (version.handshake_protocol != PROTOCOL_TLS1_3) { |
| if (session->config()->HasReceivedInitialStreamFlowControlWindowBytes()) { |
| return session->config()->ReceivedInitialStreamFlowControlWindowBytes(); |
| } |
| |
| return DefaultFlowControlWindow(version); |
| } |
| |
| // Unidirectional streams (v99 only). |
| if (VersionHasIetfQuicFrames(version.transport_version) && |
| !QuicUtils::IsBidirectionalStreamId(stream_id)) { |
| if (session->config() |
| ->HasReceivedInitialMaxStreamDataBytesUnidirectional()) { |
| return session->config() |
| ->ReceivedInitialMaxStreamDataBytesUnidirectional(); |
| } |
| |
| return DefaultFlowControlWindow(version); |
| } |
| |
| if (QuicUtils::IsOutgoingStreamId(version, stream_id, |
| session->perspective())) { |
| if (session->config() |
| ->HasReceivedInitialMaxStreamDataBytesOutgoingBidirectional()) { |
| return session->config() |
| ->ReceivedInitialMaxStreamDataBytesOutgoingBidirectional(); |
| } |
| |
| return DefaultFlowControlWindow(version); |
| } |
| |
| if (session->config() |
| ->HasReceivedInitialMaxStreamDataBytesIncomingBidirectional()) { |
| return session->config() |
| ->ReceivedInitialMaxStreamDataBytesIncomingBidirectional(); |
| } |
| |
| return DefaultFlowControlWindow(version); |
| } |
| |
| } // namespace |
| |
| // static |
| const SpdyPriority QuicStream::kDefaultPriority; |
| |
| PendingStream::PendingStream(QuicStreamId id, QuicSession* session) |
| : id_(id), |
| session_(session), |
| stream_bytes_read_(0), |
| fin_received_(false), |
| connection_flow_controller_(session->flow_controller()), |
| flow_controller_(session, |
| id, |
| /*is_connection_flow_controller*/ false, |
| GetReceivedFlowControlWindow(session, id), |
| GetInitialStreamFlowControlWindowToSend(session, id), |
| kStreamReceiveWindowLimit, |
| session_->flow_controller()->auto_tune_receive_window(), |
| session_->flow_controller()), |
| sequencer_(this) {} |
| |
| void PendingStream::OnDataAvailable() { |
| // Data should be kept in the sequencer so that |
| // QuicSession::ProcessPendingStream() can read it. |
| } |
| |
| void PendingStream::OnFinRead() { |
| DCHECK(sequencer_.IsClosed()); |
| } |
| |
| void PendingStream::AddBytesConsumed(QuicByteCount bytes) { |
| // It will be called when the metadata of the stream is consumed. |
| flow_controller_.AddBytesConsumed(bytes); |
| connection_flow_controller_->AddBytesConsumed(bytes); |
| } |
| |
| void PendingStream::Reset(QuicRstStreamErrorCode error) { |
| // TODO: RESET_STREAM must not be sent for READ_UNIDIRECTIONAL stream. |
| session_->SendRstStream(id_, error, 0); |
| } |
| |
| void PendingStream::CloseConnectionWithDetails(QuicErrorCode error, |
| const std::string& details) { |
| session_->connection()->CloseConnection( |
| error, details, ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET); |
| } |
| |
| QuicStreamId PendingStream::id() const { |
| return id_; |
| } |
| |
| const QuicSocketAddress& PendingStream::PeerAddressOfLatestPacket() const { |
| return session_->connection()->last_packet_source_address(); |
| } |
| |
| void PendingStream::OnStreamFrame(const QuicStreamFrame& frame) { |
| DCHECK_EQ(frame.stream_id, id_); |
| |
| bool is_stream_too_long = |
| (frame.offset > kMaxStreamLength) || |
| (kMaxStreamLength - frame.offset < frame.data_length); |
| if (is_stream_too_long) { |
| // Close connection if stream becomes too long. |
| QUIC_PEER_BUG |
| << "Receive stream frame reaches max stream length. frame offset " |
| << frame.offset << " length " << frame.data_length; |
| CloseConnectionWithDetails( |
| QUIC_STREAM_LENGTH_OVERFLOW, |
| "Peer sends more data than allowed on this stream."); |
| return; |
| } |
| |
| if (GetQuicReloadableFlag(quic_rst_if_stream_frame_beyond_close_offset) && |
| frame.offset + frame.data_length > sequencer_.close_offset()) { |
| Reset(QUIC_DATA_AFTER_CLOSE_OFFSET); |
| return; |
| } |
| |
| if (frame.fin) { |
| fin_received_ = true; |
| } |
| |
| // This count includes duplicate data received. |
| size_t frame_payload_size = frame.data_length; |
| stream_bytes_read_ += frame_payload_size; |
| |
| // Flow control is interested in tracking highest received offset. |
| // Only interested in received frames that carry data. |
| if (frame_payload_size > 0 && |
| MaybeIncreaseHighestReceivedOffset(frame.offset + frame_payload_size)) { |
| // As the highest received offset has changed, check to see if this is a |
| // violation of flow control. |
| if (flow_controller_.FlowControlViolation() || |
| connection_flow_controller_->FlowControlViolation()) { |
| CloseConnectionWithDetails( |
| QUIC_FLOW_CONTROL_RECEIVED_TOO_MUCH_DATA, |
| "Flow control violation after increasing offset"); |
| return; |
| } |
| } |
| |
| sequencer_.OnStreamFrame(frame); |
| } |
| |
| void PendingStream::OnRstStreamFrame(const QuicRstStreamFrame& frame) { |
| DCHECK_EQ(frame.stream_id, id_); |
| |
| if (frame.byte_offset > kMaxStreamLength) { |
| // Peer are not suppose to write bytes more than maxium allowed. |
| CloseConnectionWithDetails(QUIC_STREAM_LENGTH_OVERFLOW, |
| "Reset frame stream offset overflow."); |
| return; |
| } |
| MaybeIncreaseHighestReceivedOffset(frame.byte_offset); |
| if (flow_controller_.FlowControlViolation() || |
| connection_flow_controller_->FlowControlViolation()) { |
| CloseConnectionWithDetails( |
| QUIC_FLOW_CONTROL_RECEIVED_TOO_MUCH_DATA, |
| "Flow control violation after increasing offset"); |
| return; |
| } |
| } |
| |
| bool PendingStream::MaybeIncreaseHighestReceivedOffset( |
| QuicStreamOffset new_offset) { |
| uint64_t increment = |
| new_offset - flow_controller_.highest_received_byte_offset(); |
| if (!flow_controller_.UpdateHighestReceivedOffset(new_offset)) { |
| return false; |
| } |
| |
| // If |new_offset| increased the stream flow controller's highest received |
| // offset, increase the connection flow controller's value by the incremental |
| // difference. |
| connection_flow_controller_->UpdateHighestReceivedOffset( |
| connection_flow_controller_->highest_received_byte_offset() + increment); |
| return true; |
| } |
| |
| void PendingStream::MarkConsumed(size_t num_bytes) { |
| sequencer_.MarkConsumed(num_bytes); |
| } |
| |
| void PendingStream::StopReading() { |
| QUIC_DVLOG(1) << "Stop reading from pending stream " << id(); |
| sequencer_.StopReading(); |
| } |
| |
| QuicStream::QuicStream(PendingStream* pending, StreamType type, bool is_static) |
| : QuicStream(pending->id_, |
| pending->session_, |
| std::move(pending->sequencer_), |
| is_static, |
| type, |
| pending->stream_bytes_read_, |
| pending->fin_received_, |
| std::move(pending->flow_controller_), |
| pending->connection_flow_controller_) { |
| sequencer_.set_stream(this); |
| } |
| |
| namespace { |
| |
| QuicOptional<QuicFlowController> FlowController(QuicStreamId id, |
| QuicSession* session, |
| StreamType type) { |
| if (type == CRYPTO) { |
| // The only QuicStream with a StreamType of CRYPTO is QuicCryptoStream, when |
| // it is using crypto frames instead of stream frames. The QuicCryptoStream |
| // doesn't have any flow control in that case, so we don't create a |
| // QuicFlowController for it. |
| return QuicOptional<QuicFlowController>(); |
| } |
| return QuicFlowController( |
| session, id, |
| /*is_connection_flow_controller*/ false, |
| GetReceivedFlowControlWindow(session, id), |
| GetInitialStreamFlowControlWindowToSend(session, id), |
| kStreamReceiveWindowLimit, |
| session->flow_controller()->auto_tune_receive_window(), |
| session->flow_controller()); |
| } |
| |
| } // namespace |
| |
| QuicStream::QuicStream(QuicStreamId id, |
| QuicSession* session, |
| bool is_static, |
| StreamType type) |
| : QuicStream(id, |
| session, |
| QuicStreamSequencer(this), |
| is_static, |
| type, |
| 0, |
| false, |
| FlowController(id, session, type), |
| session->flow_controller()) {} |
| |
| QuicStream::QuicStream(QuicStreamId id, |
| QuicSession* session, |
| QuicStreamSequencer sequencer, |
| bool is_static, |
| StreamType type, |
| uint64_t stream_bytes_read, |
| bool fin_received, |
| QuicOptional<QuicFlowController> flow_controller, |
| QuicFlowController* connection_flow_controller) |
| : sequencer_(std::move(sequencer)), |
| id_(id), |
| session_(session), |
| precedence_( |
| session->use_http2_priority_write_scheduler() |
| ? spdy::SpdyStreamPrecedence(0, |
| spdy::kHttp2DefaultStreamWeight, |
| false) |
| : spdy::SpdyStreamPrecedence(kDefaultPriority)), |
| stream_bytes_read_(stream_bytes_read), |
| stream_error_(QUIC_STREAM_NO_ERROR), |
| connection_error_(QUIC_NO_ERROR), |
| read_side_closed_(false), |
| write_side_closed_(false), |
| fin_buffered_(false), |
| fin_sent_(false), |
| fin_outstanding_(false), |
| fin_lost_(false), |
| fin_received_(fin_received), |
| rst_sent_(false), |
| rst_received_(false), |
| perspective_(session_->perspective()), |
| flow_controller_(std::move(flow_controller)), |
| connection_flow_controller_(connection_flow_controller), |
| stream_contributes_to_connection_flow_control_(true), |
| busy_counter_(0), |
| add_random_padding_after_fin_(false), |
| send_buffer_( |
| session->connection()->helper()->GetStreamSendBufferAllocator()), |
| buffered_data_threshold_(GetQuicFlag(FLAGS_quic_buffered_data_threshold)), |
| is_static_(is_static), |
| deadline_(QuicTime::Zero()), |
| type_(VersionHasIetfQuicFrames(session->transport_version()) && |
| type != CRYPTO |
| ? QuicUtils::GetStreamType(id_, |
| perspective_, |
| session->IsIncomingStream(id_)) |
| : type) { |
| if (type_ == WRITE_UNIDIRECTIONAL) { |
| set_fin_received(true); |
| CloseReadSide(); |
| } else if (type_ == READ_UNIDIRECTIONAL) { |
| set_fin_sent(true); |
| CloseWriteSide(); |
| } |
| SetFromConfig(); |
| if (type_ != CRYPTO) { |
| session_->RegisterStreamPriority(id, is_static_, precedence_); |
| } |
| } |
| |
| QuicStream::~QuicStream() { |
| if (session_ != nullptr && IsWaitingForAcks()) { |
| QUIC_DVLOG(1) |
| << ENDPOINT << "Stream " << id_ |
| << " gets destroyed while waiting for acks. stream_bytes_outstanding = " |
| << send_buffer_.stream_bytes_outstanding() |
| << ", fin_outstanding: " << fin_outstanding_; |
| } |
| if (session_ != nullptr && type_ != CRYPTO) { |
| session_->UnregisterStreamPriority(id(), is_static_); |
| } |
| } |
| |
| void QuicStream::SetFromConfig() {} |
| |
| void QuicStream::OnStreamFrame(const QuicStreamFrame& frame) { |
| DCHECK_EQ(frame.stream_id, id_); |
| |
| DCHECK(!(read_side_closed_ && write_side_closed_)); |
| |
| if (type_ == WRITE_UNIDIRECTIONAL) { |
| CloseConnectionWithDetails( |
| QUIC_DATA_RECEIVED_ON_WRITE_UNIDIRECTIONAL_STREAM, |
| "Data received on write unidirectional stream"); |
| return; |
| } |
| |
| bool is_stream_too_long = |
| (frame.offset > kMaxStreamLength) || |
| (kMaxStreamLength - frame.offset < frame.data_length); |
| if (is_stream_too_long) { |
| // Close connection if stream becomes too long. |
| QUIC_PEER_BUG << "Receive stream frame on stream " << id_ |
| << " reaches max stream length. frame offset " << frame.offset |
| << " length " << frame.data_length << ". " |
| << sequencer_.DebugString(); |
| CloseConnectionWithDetails( |
| QUIC_STREAM_LENGTH_OVERFLOW, |
| QuicStrCat("Peer sends more data than allowed on stream ", id_, |
| ". frame: offset = ", frame.offset, ", length = ", |
| frame.data_length, ". ", sequencer_.DebugString())); |
| return; |
| } |
| |
| if (GetQuicReloadableFlag(quic_rst_if_stream_frame_beyond_close_offset)) { |
| QUIC_RELOADABLE_FLAG_COUNT(quic_rst_if_stream_frame_beyond_close_offset); |
| if (frame.offset + frame.data_length > sequencer_.close_offset()) { |
| Reset(QUIC_DATA_AFTER_CLOSE_OFFSET); |
| return; |
| } |
| } |
| |
| if (frame.fin) { |
| fin_received_ = true; |
| if (fin_sent_) { |
| session_->StreamDraining(id_); |
| } |
| } |
| |
| if (read_side_closed_) { |
| QUIC_DLOG(INFO) |
| << ENDPOINT << "Stream " << frame.stream_id |
| << " is closed for reading. Ignoring newly received stream data."; |
| // The subclass does not want to read data: blackhole the data. |
| return; |
| } |
| |
| // This count includes duplicate data received. |
| size_t frame_payload_size = frame.data_length; |
| stream_bytes_read_ += frame_payload_size; |
| |
| // Flow control is interested in tracking highest received offset. |
| // Only interested in received frames that carry data. |
| if (frame_payload_size > 0 && |
| MaybeIncreaseHighestReceivedOffset(frame.offset + frame_payload_size)) { |
| // As the highest received offset has changed, check to see if this is a |
| // violation of flow control. |
| if (flow_controller_->FlowControlViolation() || |
| connection_flow_controller_->FlowControlViolation()) { |
| CloseConnectionWithDetails( |
| QUIC_FLOW_CONTROL_RECEIVED_TOO_MUCH_DATA, |
| "Flow control violation after increasing offset"); |
| return; |
| } |
| } |
| |
| sequencer_.OnStreamFrame(frame); |
| } |
| |
| int QuicStream::num_frames_received() const { |
| return sequencer_.num_frames_received(); |
| } |
| |
| int QuicStream::num_duplicate_frames_received() const { |
| return sequencer_.num_duplicate_frames_received(); |
| } |
| |
| void QuicStream::OnStreamReset(const QuicRstStreamFrame& frame) { |
| rst_received_ = true; |
| if (frame.byte_offset > kMaxStreamLength) { |
| // Peer are not suppose to write bytes more than maxium allowed. |
| CloseConnectionWithDetails(QUIC_STREAM_LENGTH_OVERFLOW, |
| "Reset frame stream offset overflow."); |
| return; |
| } |
| MaybeIncreaseHighestReceivedOffset(frame.byte_offset); |
| if (flow_controller_->FlowControlViolation() || |
| connection_flow_controller_->FlowControlViolation()) { |
| CloseConnectionWithDetails( |
| QUIC_FLOW_CONTROL_RECEIVED_TOO_MUCH_DATA, |
| "Flow control violation after increasing offset"); |
| return; |
| } |
| |
| stream_error_ = frame.error_code; |
| // Google QUIC closes both sides of the stream in response to a |
| // RESET_STREAM, IETF QUIC closes only the read side. |
| if (!VersionHasIetfQuicFrames(transport_version())) { |
| CloseWriteSide(); |
| } |
| CloseReadSide(); |
| } |
| |
| void QuicStream::OnConnectionClosed(QuicErrorCode error, |
| ConnectionCloseSource /*source*/) { |
| if (read_side_closed_ && write_side_closed_) { |
| return; |
| } |
| if (error != QUIC_NO_ERROR) { |
| stream_error_ = QUIC_STREAM_CONNECTION_ERROR; |
| connection_error_ = error; |
| } |
| |
| CloseWriteSide(); |
| CloseReadSide(); |
| } |
| |
| void QuicStream::OnFinRead() { |
| DCHECK(sequencer_.IsClosed()); |
| // OnFinRead can be called due to a FIN flag in a headers block, so there may |
| // have been no OnStreamFrame call with a FIN in the frame. |
| fin_received_ = true; |
| // If fin_sent_ is true, then CloseWriteSide has already been called, and the |
| // stream will be destroyed by CloseReadSide, so don't need to call |
| // StreamDraining. |
| CloseReadSide(); |
| } |
| |
| void QuicStream::Reset(QuicRstStreamErrorCode error) { |
| stream_error_ = error; |
| // Sending a RstStream results in calling CloseStream. |
| session()->SendRstStream(id(), error, stream_bytes_written()); |
| rst_sent_ = true; |
| } |
| |
| void QuicStream::CloseConnectionWithDetails(QuicErrorCode error, |
| const std::string& details) { |
| session()->connection()->CloseConnection( |
| error, details, ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET); |
| } |
| |
| const spdy::SpdyStreamPrecedence& QuicStream::precedence() const { |
| return precedence_; |
| } |
| |
| void QuicStream::SetPriority(const spdy::SpdyStreamPrecedence& precedence) { |
| precedence_ = precedence; |
| session_->UpdateStreamPriority(id(), precedence); |
| } |
| |
| void QuicStream::WriteOrBufferData( |
| QuicStringPiece data, |
| bool fin, |
| QuicReferenceCountedPointer<QuicAckListenerInterface> ack_listener) { |
| if (data.empty() && !fin) { |
| QUIC_BUG << "data.empty() && !fin"; |
| return; |
| } |
| |
| if (fin_buffered_) { |
| QUIC_BUG << "Fin already buffered"; |
| return; |
| } |
| if (write_side_closed_) { |
| QUIC_DLOG(ERROR) << ENDPOINT |
| << "Attempt to write when the write side is closed"; |
| if (type_ == READ_UNIDIRECTIONAL) { |
| CloseConnectionWithDetails( |
| QUIC_TRY_TO_WRITE_DATA_ON_READ_UNIDIRECTIONAL_STREAM, |
| "Try to send data on read unidirectional stream"); |
| } |
| return; |
| } |
| |
| fin_buffered_ = fin; |
| |
| bool had_buffered_data = HasBufferedData(); |
| // Do not respect buffered data upper limit as WriteOrBufferData guarantees |
| // all data to be consumed. |
| if (data.length() > 0) { |
| struct iovec iov(QuicUtils::MakeIovec(data)); |
| QuicStreamOffset offset = send_buffer_.stream_offset(); |
| if (kMaxStreamLength - offset < data.length()) { |
| QUIC_BUG << "Write too many data via stream " << id_; |
| CloseConnectionWithDetails( |
| QUIC_STREAM_LENGTH_OVERFLOW, |
| QuicStrCat("Write too many data via stream ", id_)); |
| return; |
| } |
| send_buffer_.SaveStreamData(&iov, 1, 0, data.length()); |
| OnDataBuffered(offset, data.length(), ack_listener); |
| } |
| if (!had_buffered_data && (HasBufferedData() || fin_buffered_)) { |
| // Write data if there is no buffered data before. |
| WriteBufferedData(); |
| } |
| } |
| |
| void QuicStream::OnCanWrite() { |
| if (HasDeadlinePassed()) { |
| OnDeadlinePassed(); |
| return; |
| } |
| if (HasPendingRetransmission()) { |
| WritePendingRetransmission(); |
| // Exit early to allow other streams to write pending retransmissions if |
| // any. |
| return; |
| } |
| |
| if (write_side_closed_) { |
| QUIC_DLOG(ERROR) |
| << ENDPOINT << "Stream " << id() |
| << " attempting to write new data when the write side is closed"; |
| return; |
| } |
| if (HasBufferedData() || (fin_buffered_ && !fin_sent_)) { |
| WriteBufferedData(); |
| } |
| if (!fin_buffered_ && !fin_sent_ && CanWriteNewData()) { |
| // Notify upper layer to write new data when buffered data size is below |
| // low water mark. |
| OnCanWriteNewData(); |
| } |
| } |
| |
| void QuicStream::MaybeSendBlocked() { |
| if (flow_controller_->ShouldSendBlocked()) { |
| session_->SendBlocked(id_); |
| } |
| if (!stream_contributes_to_connection_flow_control_) { |
| return; |
| } |
| if (connection_flow_controller_->ShouldSendBlocked()) { |
| session_->SendBlocked(QuicUtils::GetInvalidStreamId(transport_version())); |
| } |
| // If the stream is blocked by connection-level flow control but not by |
| // stream-level flow control, add the stream to the write blocked list so that |
| // the stream will be given a chance to write when a connection-level |
| // WINDOW_UPDATE arrives. |
| if (connection_flow_controller_->IsBlocked() && |
| !flow_controller_->IsBlocked()) { |
| session_->MarkConnectionLevelWriteBlocked(id()); |
| } |
| } |
| |
| QuicConsumedData QuicStream::WritevData(const struct iovec* iov, |
| int iov_count, |
| bool fin) { |
| if (write_side_closed_) { |
| QUIC_DLOG(ERROR) << ENDPOINT << "Stream " << id() |
| << "attempting to write when the write side is closed"; |
| if (type_ == READ_UNIDIRECTIONAL) { |
| CloseConnectionWithDetails( |
| QUIC_TRY_TO_WRITE_DATA_ON_READ_UNIDIRECTIONAL_STREAM, |
| "Try to send data on read unidirectional stream"); |
| } |
| return QuicConsumedData(0, false); |
| } |
| |
| // How much data was provided. |
| size_t write_length = 0; |
| if (iov != nullptr) { |
| for (int i = 0; i < iov_count; ++i) { |
| write_length += iov[i].iov_len; |
| } |
| } |
| |
| QuicConsumedData consumed_data(0, false); |
| if (fin_buffered_) { |
| QUIC_BUG << "Fin already buffered"; |
| return consumed_data; |
| } |
| |
| if (kMaxStreamLength - send_buffer_.stream_offset() < write_length) { |
| QUIC_BUG << "Write too many data via stream " << id_; |
| CloseConnectionWithDetails( |
| QUIC_STREAM_LENGTH_OVERFLOW, |
| QuicStrCat("Write too many data via stream ", id_)); |
| return consumed_data; |
| } |
| |
| bool had_buffered_data = HasBufferedData(); |
| if (CanWriteNewData()) { |
| // Save all data if buffered data size is below low water mark. |
| consumed_data.bytes_consumed = write_length; |
| if (consumed_data.bytes_consumed > 0) { |
| QuicStreamOffset offset = send_buffer_.stream_offset(); |
| send_buffer_.SaveStreamData(iov, iov_count, 0, write_length); |
| OnDataBuffered(offset, write_length, nullptr); |
| } |
| } |
| consumed_data.fin_consumed = |
| consumed_data.bytes_consumed == write_length && fin; |
| fin_buffered_ = consumed_data.fin_consumed; |
| |
| if (!had_buffered_data && (HasBufferedData() || fin_buffered_)) { |
| // Write data if there is no buffered data before. |
| WriteBufferedData(); |
| } |
| |
| return consumed_data; |
| } |
| |
| QuicConsumedData QuicStream::WriteMemSlices(QuicMemSliceSpan span, bool fin) { |
| QuicConsumedData consumed_data(0, false); |
| if (span.empty() && !fin) { |
| QUIC_BUG << "span.empty() && !fin"; |
| return consumed_data; |
| } |
| |
| if (fin_buffered_) { |
| QUIC_BUG << "Fin already buffered"; |
| return consumed_data; |
| } |
| |
| if (write_side_closed_) { |
| QUIC_DLOG(ERROR) << ENDPOINT << "Stream " << id() |
| << " attempting to write when the write side is closed"; |
| if (type_ == READ_UNIDIRECTIONAL) { |
| CloseConnectionWithDetails( |
| QUIC_TRY_TO_WRITE_DATA_ON_READ_UNIDIRECTIONAL_STREAM, |
| "Try to send data on read unidirectional stream"); |
| } |
| return consumed_data; |
| } |
| |
| bool had_buffered_data = HasBufferedData(); |
| if (CanWriteNewData() || span.empty()) { |
| consumed_data.fin_consumed = fin; |
| if (!span.empty()) { |
| // Buffer all data if buffered data size is below limit. |
| QuicStreamOffset offset = send_buffer_.stream_offset(); |
| consumed_data.bytes_consumed = send_buffer_.SaveMemSliceSpan(span); |
| if (offset > send_buffer_.stream_offset() || |
| kMaxStreamLength < send_buffer_.stream_offset()) { |
| QUIC_BUG << "Write too many data via stream " << id_; |
| CloseConnectionWithDetails( |
| QUIC_STREAM_LENGTH_OVERFLOW, |
| QuicStrCat("Write too many data via stream ", id_)); |
| return consumed_data; |
| } |
| OnDataBuffered(offset, consumed_data.bytes_consumed, nullptr); |
| } |
| } |
| fin_buffered_ = consumed_data.fin_consumed; |
| |
| if (!had_buffered_data && (HasBufferedData() || fin_buffered_)) { |
| // Write data if there is no buffered data before. |
| WriteBufferedData(); |
| } |
| |
| return consumed_data; |
| } |
| |
| bool QuicStream::HasPendingRetransmission() const { |
| return send_buffer_.HasPendingRetransmission() || fin_lost_; |
| } |
| |
| bool QuicStream::IsStreamFrameOutstanding(QuicStreamOffset offset, |
| QuicByteCount data_length, |
| bool fin) const { |
| return send_buffer_.IsStreamDataOutstanding(offset, data_length) || |
| (fin && fin_outstanding_); |
| } |
| |
| void QuicStream::CloseReadSide() { |
| if (read_side_closed_) { |
| return; |
| } |
| QUIC_DVLOG(1) << ENDPOINT << "Done reading from stream " << id(); |
| |
| read_side_closed_ = true; |
| sequencer_.ReleaseBuffer(); |
| |
| if (write_side_closed_) { |
| QUIC_DVLOG(1) << ENDPOINT << "Closing stream " << id(); |
| session_->CloseStream(id()); |
| } |
| } |
| |
| void QuicStream::CloseWriteSide() { |
| if (write_side_closed_) { |
| return; |
| } |
| QUIC_DVLOG(1) << ENDPOINT << "Done writing to stream " << id(); |
| |
| write_side_closed_ = true; |
| if (read_side_closed_) { |
| QUIC_DVLOG(1) << ENDPOINT << "Closing stream " << id(); |
| session_->CloseStream(id()); |
| } |
| } |
| |
| bool QuicStream::HasBufferedData() const { |
| DCHECK_GE(send_buffer_.stream_offset(), stream_bytes_written()); |
| return send_buffer_.stream_offset() > stream_bytes_written(); |
| } |
| |
| QuicTransportVersion QuicStream::transport_version() const { |
| return session_->transport_version(); |
| } |
| |
| HandshakeProtocol QuicStream::handshake_protocol() const { |
| return session_->connection()->version().handshake_protocol; |
| } |
| |
| void QuicStream::StopReading() { |
| QUIC_DVLOG(1) << ENDPOINT << "Stop reading from stream " << id(); |
| sequencer_.StopReading(); |
| } |
| |
| const QuicSocketAddress& QuicStream::PeerAddressOfLatestPacket() const { |
| return session_->connection()->last_packet_source_address(); |
| } |
| |
| void QuicStream::OnClose() { |
| CloseReadSide(); |
| CloseWriteSide(); |
| |
| if (!fin_sent_ && !rst_sent_) { |
| // For flow control accounting, tell the peer how many bytes have been |
| // written on this stream before termination. Done here if needed, using a |
| // RST_STREAM frame. |
| QUIC_DLOG(INFO) << ENDPOINT << "Sending RST_STREAM in OnClose: " << id(); |
| session_->SendRstStream(id(), QUIC_RST_ACKNOWLEDGEMENT, |
| stream_bytes_written()); |
| session_->OnStreamDoneWaitingForAcks(id_); |
| rst_sent_ = true; |
| } |
| |
| if (flow_controller_->FlowControlViolation() || |
| connection_flow_controller_->FlowControlViolation()) { |
| return; |
| } |
| // The stream is being closed and will not process any further incoming bytes. |
| // As there may be more bytes in flight, to ensure that both endpoints have |
| // the same connection level flow control state, mark all unreceived or |
| // buffered bytes as consumed. |
| QuicByteCount bytes_to_consume = |
| flow_controller_->highest_received_byte_offset() - |
| flow_controller_->bytes_consumed(); |
| AddBytesConsumed(bytes_to_consume); |
| } |
| |
| void QuicStream::OnWindowUpdateFrame(const QuicWindowUpdateFrame& frame) { |
| if (type_ == READ_UNIDIRECTIONAL) { |
| CloseConnectionWithDetails( |
| QUIC_WINDOW_UPDATE_RECEIVED_ON_READ_UNIDIRECTIONAL_STREAM, |
| "WindowUpdateFrame received on READ_UNIDIRECTIONAL stream."); |
| return; |
| } |
| |
| if (flow_controller_->UpdateSendWindowOffset(frame.byte_offset)) { |
| // Let session unblock this stream. |
| session_->MarkConnectionLevelWriteBlocked(id_); |
| } |
| } |
| |
| bool QuicStream::MaybeIncreaseHighestReceivedOffset( |
| QuicStreamOffset new_offset) { |
| uint64_t increment = |
| new_offset - flow_controller_->highest_received_byte_offset(); |
| if (!flow_controller_->UpdateHighestReceivedOffset(new_offset)) { |
| return false; |
| } |
| |
| // If |new_offset| increased the stream flow controller's highest received |
| // offset, increase the connection flow controller's value by the incremental |
| // difference. |
| if (stream_contributes_to_connection_flow_control_) { |
| connection_flow_controller_->UpdateHighestReceivedOffset( |
| connection_flow_controller_->highest_received_byte_offset() + |
| increment); |
| } |
| return true; |
| } |
| |
| void QuicStream::AddBytesSent(QuicByteCount bytes) { |
| flow_controller_->AddBytesSent(bytes); |
| if (stream_contributes_to_connection_flow_control_) { |
| connection_flow_controller_->AddBytesSent(bytes); |
| } |
| } |
| |
| void QuicStream::AddBytesConsumed(QuicByteCount bytes) { |
| if (type_ == CRYPTO) { |
| // A stream with type CRYPTO has no flow control, so there's nothing this |
| // function needs to do. This function still gets called by the |
| // QuicStreamSequencers used by QuicCryptoStream. |
| return; |
| } |
| // Only adjust stream level flow controller if still reading. |
| if (!read_side_closed_) { |
| flow_controller_->AddBytesConsumed(bytes); |
| } |
| |
| if (stream_contributes_to_connection_flow_control_) { |
| connection_flow_controller_->AddBytesConsumed(bytes); |
| } |
| } |
| |
| void QuicStream::UpdateSendWindowOffset(QuicStreamOffset new_window) { |
| if (flow_controller_->UpdateSendWindowOffset(new_window)) { |
| // Let session unblock this stream. |
| session_->MarkConnectionLevelWriteBlocked(id_); |
| } |
| } |
| |
| void QuicStream::AddRandomPaddingAfterFin() { |
| add_random_padding_after_fin_ = true; |
| } |
| |
| bool QuicStream::OnStreamFrameAcked(QuicStreamOffset offset, |
| QuicByteCount data_length, |
| bool fin_acked, |
| QuicTime::Delta /*ack_delay_time*/, |
| QuicByteCount* newly_acked_length) { |
| QUIC_DVLOG(1) << ENDPOINT << "stream " << id_ << " Acking " |
| << "[" << offset << ", " << offset + data_length << "]" |
| << " fin = " << fin_acked; |
| *newly_acked_length = 0; |
| if (!send_buffer_.OnStreamDataAcked(offset, data_length, |
| newly_acked_length)) { |
| CloseConnectionWithDetails(QUIC_INTERNAL_ERROR, |
| "Trying to ack unsent data."); |
| return false; |
| } |
| if (!fin_sent_ && fin_acked) { |
| CloseConnectionWithDetails(QUIC_INTERNAL_ERROR, |
| "Trying to ack unsent fin."); |
| return false; |
| } |
| // Indicates whether ack listener's OnPacketAcked should be called. |
| const bool new_data_acked = |
| *newly_acked_length > 0 || (fin_acked && fin_outstanding_); |
| if (fin_acked) { |
| fin_outstanding_ = false; |
| fin_lost_ = false; |
| } |
| if (!IsWaitingForAcks()) { |
| session_->OnStreamDoneWaitingForAcks(id_); |
| } |
| return new_data_acked; |
| } |
| |
| void QuicStream::OnStreamFrameRetransmitted(QuicStreamOffset offset, |
| QuicByteCount data_length, |
| bool fin_retransmitted) { |
| send_buffer_.OnStreamDataRetransmitted(offset, data_length); |
| if (fin_retransmitted) { |
| fin_lost_ = false; |
| } |
| } |
| |
| void QuicStream::OnStreamFrameLost(QuicStreamOffset offset, |
| QuicByteCount data_length, |
| bool fin_lost) { |
| QUIC_DVLOG(1) << ENDPOINT << "stream " << id_ << " Losting " |
| << "[" << offset << ", " << offset + data_length << "]" |
| << " fin = " << fin_lost; |
| if (data_length > 0) { |
| send_buffer_.OnStreamDataLost(offset, data_length); |
| } |
| if (fin_lost && fin_outstanding_) { |
| fin_lost_ = true; |
| } |
| } |
| |
| bool QuicStream::RetransmitStreamData(QuicStreamOffset offset, |
| QuicByteCount data_length, |
| bool fin) { |
| if (HasDeadlinePassed()) { |
| OnDeadlinePassed(); |
| return true; |
| } |
| QuicIntervalSet<QuicStreamOffset> retransmission(offset, |
| offset + data_length); |
| retransmission.Difference(bytes_acked()); |
| bool retransmit_fin = fin && fin_outstanding_; |
| if (retransmission.Empty() && !retransmit_fin) { |
| return true; |
| } |
| QuicConsumedData consumed(0, false); |
| for (const auto& interval : retransmission) { |
| QuicStreamOffset retransmission_offset = interval.min(); |
| QuicByteCount retransmission_length = interval.max() - interval.min(); |
| const bool can_bundle_fin = |
| retransmit_fin && (retransmission_offset + retransmission_length == |
| stream_bytes_written()); |
| consumed = session()->WritevData(this, id_, retransmission_length, |
| retransmission_offset, |
| can_bundle_fin ? FIN : NO_FIN); |
| QUIC_DVLOG(1) << ENDPOINT << "stream " << id_ |
| << " is forced to retransmit stream data [" |
| << retransmission_offset << ", " |
| << retransmission_offset + retransmission_length |
| << ") and fin: " << can_bundle_fin |
| << ", consumed: " << consumed; |
| OnStreamFrameRetransmitted(retransmission_offset, consumed.bytes_consumed, |
| consumed.fin_consumed); |
| if (can_bundle_fin) { |
| retransmit_fin = !consumed.fin_consumed; |
| } |
| if (consumed.bytes_consumed < retransmission_length || |
| (can_bundle_fin && !consumed.fin_consumed)) { |
| // Connection is write blocked. |
| return false; |
| } |
| } |
| if (retransmit_fin) { |
| QUIC_DVLOG(1) << ENDPOINT << "stream " << id_ |
| << " retransmits fin only frame."; |
| consumed = session()->WritevData(this, id_, 0, stream_bytes_written(), FIN); |
| if (!consumed.fin_consumed) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| bool QuicStream::IsWaitingForAcks() const { |
| return (!rst_sent_ || stream_error_ == QUIC_STREAM_NO_ERROR) && |
| (send_buffer_.stream_bytes_outstanding() || fin_outstanding_); |
| } |
| |
| size_t QuicStream::ReadableBytes() const { |
| return sequencer_.ReadableBytes(); |
| } |
| |
| bool QuicStream::WriteStreamData(QuicStreamOffset offset, |
| QuicByteCount data_length, |
| QuicDataWriter* writer) { |
| DCHECK_LT(0u, data_length); |
| QUIC_DVLOG(2) << ENDPOINT << "Write stream " << id_ << " data from offset " |
| << offset << " length " << data_length; |
| return send_buffer_.WriteStreamData(offset, data_length, writer); |
| } |
| |
| void QuicStream::WriteBufferedData() { |
| DCHECK(!write_side_closed_ && (HasBufferedData() || fin_buffered_)); |
| |
| if (session_->ShouldYield(id())) { |
| session_->MarkConnectionLevelWriteBlocked(id()); |
| return; |
| } |
| |
| // Size of buffered data. |
| size_t write_length = BufferedDataBytes(); |
| |
| // A FIN with zero data payload should not be flow control blocked. |
| bool fin_with_zero_data = (fin_buffered_ && write_length == 0); |
| |
| bool fin = fin_buffered_; |
| |
| // How much data flow control permits to be written. |
| QuicByteCount send_window = flow_controller_->SendWindowSize(); |
| if (stream_contributes_to_connection_flow_control_) { |
| send_window = |
| std::min(send_window, connection_flow_controller_->SendWindowSize()); |
| } |
| |
| if (send_window == 0 && !fin_with_zero_data) { |
| // Quick return if nothing can be sent. |
| MaybeSendBlocked(); |
| return; |
| } |
| |
| if (write_length > send_window) { |
| // Don't send the FIN unless all the data will be sent. |
| fin = false; |
| |
| // Writing more data would be a violation of flow control. |
| write_length = static_cast<size_t>(send_window); |
| QUIC_DVLOG(1) << "stream " << id() << " shortens write length to " |
| << write_length << " due to flow control"; |
| } |
| if (session_->session_decides_what_to_write()) { |
| session_->SetTransmissionType(NOT_RETRANSMISSION); |
| } |
| |
| StreamSendingState state = fin ? FIN : NO_FIN; |
| if (fin && add_random_padding_after_fin_) { |
| state = FIN_AND_PADDING; |
| } |
| QuicConsumedData consumed_data = session_->WritevData( |
| this, id(), write_length, stream_bytes_written(), state); |
| |
| OnStreamDataConsumed(consumed_data.bytes_consumed); |
| |
| AddBytesSent(consumed_data.bytes_consumed); |
| QUIC_DVLOG(1) << ENDPOINT << "stream " << id_ << " sends " |
| << stream_bytes_written() << " bytes " |
| << " and has buffered data " << BufferedDataBytes() << " bytes." |
| << " fin is sent: " << consumed_data.fin_consumed |
| << " fin is buffered: " << fin_buffered_; |
| |
| // The write may have generated a write error causing this stream to be |
| // closed. If so, simply return without marking the stream write blocked. |
| if (write_side_closed_) { |
| return; |
| } |
| |
| if (consumed_data.bytes_consumed == write_length) { |
| if (!fin_with_zero_data) { |
| MaybeSendBlocked(); |
| } |
| if (fin && consumed_data.fin_consumed) { |
| fin_sent_ = true; |
| fin_outstanding_ = true; |
| if (fin_received_) { |
| session_->StreamDraining(id_); |
| } |
| CloseWriteSide(); |
| } else if (fin && !consumed_data.fin_consumed) { |
| session_->MarkConnectionLevelWriteBlocked(id()); |
| } |
| } else { |
| session_->MarkConnectionLevelWriteBlocked(id()); |
| } |
| if (consumed_data.bytes_consumed > 0 || consumed_data.fin_consumed) { |
| busy_counter_ = 0; |
| } |
| |
| if (IsWaitingForAcks()) { |
| session_->OnStreamWaitingForAcks(id_); |
| } |
| } |
| |
| uint64_t QuicStream::BufferedDataBytes() const { |
| DCHECK_GE(send_buffer_.stream_offset(), stream_bytes_written()); |
| return send_buffer_.stream_offset() - stream_bytes_written(); |
| } |
| |
| bool QuicStream::CanWriteNewData() const { |
| return BufferedDataBytes() < buffered_data_threshold_; |
| } |
| |
| bool QuicStream::CanWriteNewDataAfterData(QuicByteCount length) const { |
| return (BufferedDataBytes() + length) < buffered_data_threshold_; |
| } |
| |
| uint64_t QuicStream::stream_bytes_written() const { |
| return send_buffer_.stream_bytes_written(); |
| } |
| |
| const QuicIntervalSet<QuicStreamOffset>& QuicStream::bytes_acked() const { |
| return send_buffer_.bytes_acked(); |
| } |
| |
| void QuicStream::OnStreamDataConsumed(size_t bytes_consumed) { |
| send_buffer_.OnStreamDataConsumed(bytes_consumed); |
| } |
| |
| void QuicStream::WritePendingRetransmission() { |
| while (HasPendingRetransmission()) { |
| QuicConsumedData consumed(0, false); |
| if (!send_buffer_.HasPendingRetransmission()) { |
| QUIC_DVLOG(1) << ENDPOINT << "stream " << id_ |
| << " retransmits fin only frame."; |
| consumed = |
| session()->WritevData(this, id_, 0, stream_bytes_written(), FIN); |
| fin_lost_ = !consumed.fin_consumed; |
| if (fin_lost_) { |
| // Connection is write blocked. |
| return; |
| } |
| } else { |
| StreamPendingRetransmission pending = |
| send_buffer_.NextPendingRetransmission(); |
| // Determine whether the lost fin can be bundled with the data. |
| const bool can_bundle_fin = |
| fin_lost_ && |
| (pending.offset + pending.length == stream_bytes_written()); |
| consumed = |
| session()->WritevData(this, id_, pending.length, pending.offset, |
| can_bundle_fin ? FIN : NO_FIN); |
| QUIC_DVLOG(1) << ENDPOINT << "stream " << id_ |
| << " tries to retransmit stream data [" << pending.offset |
| << ", " << pending.offset + pending.length |
| << ") and fin: " << can_bundle_fin |
| << ", consumed: " << consumed; |
| OnStreamFrameRetransmitted(pending.offset, consumed.bytes_consumed, |
| consumed.fin_consumed); |
| if (consumed.bytes_consumed < pending.length || |
| (can_bundle_fin && !consumed.fin_consumed)) { |
| // Connection is write blocked. |
| return; |
| } |
| } |
| } |
| } |
| |
| bool QuicStream::MaybeSetTtl(QuicTime::Delta ttl) { |
| if (is_static_) { |
| QUIC_BUG << "Cannot set TTL of a static stream."; |
| return false; |
| } |
| if (deadline_.IsInitialized()) { |
| QUIC_DLOG(WARNING) << "Deadline has already been set."; |
| return false; |
| } |
| if (!session()->session_decides_what_to_write()) { |
| QUIC_DLOG(WARNING) << "This session does not support stream TTL yet."; |
| return false; |
| } |
| QuicTime now = session()->connection()->clock()->ApproximateNow(); |
| deadline_ = now + ttl; |
| return true; |
| } |
| |
| bool QuicStream::HasDeadlinePassed() const { |
| if (!deadline_.IsInitialized()) { |
| // No deadline has been set. |
| return false; |
| } |
| DCHECK(session()->session_decides_what_to_write()); |
| QuicTime now = session()->connection()->clock()->ApproximateNow(); |
| if (now < deadline_) { |
| return false; |
| } |
| // TTL expired. |
| QUIC_DVLOG(1) << "stream " << id() << " deadline has passed"; |
| return true; |
| } |
| |
| void QuicStream::OnDeadlinePassed() { |
| Reset(QUIC_STREAM_TTL_EXPIRED); |
| } |
| |
| void QuicStream::SendStopSending(uint16_t code) { |
| if (!VersionHasIetfQuicFrames(transport_version())) { |
| // If the connection is not version 99, do nothing. |
| // Do not QUIC_BUG or anything; the application really does not need to know |
| // what version the connection is in. |
| return; |
| } |
| session_->SendStopSending(code, id_); |
| } |
| |
| void QuicStream::OnStopSending(uint16_t /*code*/) {} |
| |
| } // namespace quic |
