| // 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/quic/quic_connection.h" |
| |
| #include <string.h> |
| #include <sys/types.h> |
| #include <algorithm> |
| #include <iterator> |
| #include <limits> |
| #include <memory> |
| #include <set> |
| #include <utility> |
| |
| #include "base/logging.h" |
| #include "base/stl_util.h" |
| #include "net/base/net_errors.h" |
| #include "net/quic/crypto/quic_decrypter.h" |
| #include "net/quic/crypto/quic_encrypter.h" |
| #include "net/quic/iovector.h" |
| #include "net/quic/quic_bandwidth.h" |
| #include "net/quic/quic_config.h" |
| #include "net/quic/quic_utils.h" |
| |
| using base::hash_map; |
| using base::hash_set; |
| using base::StringPiece; |
| using std::list; |
| using std::make_pair; |
| using std::min; |
| using std::max; |
| using std::numeric_limits; |
| using std::vector; |
| using std::set; |
| using std::string; |
| |
| int FLAGS_fake_packet_loss_percentage = 0; |
| |
| // If true, then QUIC connections will bundle acks with any outgoing packet when |
| // an ack is being delayed. This is an optimization to reduce ack latency and |
| // packet count of pure ack packets. |
| bool FLAGS_bundle_ack_with_outgoing_packet = false; |
| |
| namespace net { |
| |
| class QuicDecrypter; |
| class QuicEncrypter; |
| |
| namespace { |
| |
| // The largest gap in packets we'll accept without closing the connection. |
| // This will likely have to be tuned. |
| const QuicPacketSequenceNumber kMaxPacketGap = 5000; |
| |
| // Limit the number of FEC groups to two. If we get enough out of order packets |
| // that this becomes limiting, we can revisit. |
| const size_t kMaxFecGroups = 2; |
| |
| // Limit the number of undecryptable packets we buffer in |
| // expectation of the CHLO/SHLO arriving. |
| const size_t kMaxUndecryptablePackets = 10; |
| |
| bool Near(QuicPacketSequenceNumber a, QuicPacketSequenceNumber b) { |
| QuicPacketSequenceNumber delta = (a > b) ? a - b : b - a; |
| return delta <= kMaxPacketGap; |
| } |
| |
| |
| // An alarm that is scheduled to send an ack if a timeout occurs. |
| class AckAlarm : public QuicAlarm::Delegate { |
| public: |
| explicit AckAlarm(QuicConnection* connection) |
| : connection_(connection) { |
| } |
| |
| virtual QuicTime OnAlarm() OVERRIDE { |
| connection_->SendAck(); |
| return QuicTime::Zero(); |
| } |
| |
| private: |
| QuicConnection* connection_; |
| }; |
| |
| // This alarm will be scheduled any time a data-bearing packet is sent out. |
| // When the alarm goes off, the connection checks to see if the oldest packets |
| // have been acked, and retransmit them if they have not. |
| class RetransmissionAlarm : public QuicAlarm::Delegate { |
| public: |
| explicit RetransmissionAlarm(QuicConnection* connection) |
| : connection_(connection) { |
| } |
| |
| virtual QuicTime OnAlarm() OVERRIDE { |
| connection_->OnRetransmissionTimeout(); |
| return QuicTime::Zero(); |
| } |
| |
| private: |
| QuicConnection* connection_; |
| }; |
| |
| // An alarm that is scheduled when the sent scheduler requires a |
| // a delay before sending packets and fires when the packet may be sent. |
| class SendAlarm : public QuicAlarm::Delegate { |
| public: |
| explicit SendAlarm(QuicConnection* connection) |
| : connection_(connection) { |
| } |
| |
| virtual QuicTime OnAlarm() OVERRIDE { |
| connection_->WriteIfNotBlocked(); |
| // Never reschedule the alarm, since OnCanWrite does that. |
| return QuicTime::Zero(); |
| } |
| |
| private: |
| QuicConnection* connection_; |
| }; |
| |
| class TimeoutAlarm : public QuicAlarm::Delegate { |
| public: |
| explicit TimeoutAlarm(QuicConnection* connection) |
| : connection_(connection) { |
| } |
| |
| virtual QuicTime OnAlarm() OVERRIDE { |
| connection_->CheckForTimeout(); |
| // Never reschedule the alarm, since CheckForTimeout does that. |
| return QuicTime::Zero(); |
| } |
| |
| private: |
| QuicConnection* connection_; |
| }; |
| |
| // Indicates if any of the frames are intended to be sent with FORCE. |
| // Returns FORCE when one of the frames is a CONNECTION_CLOSE_FRAME. |
| net::QuicConnection::Force HasForcedFrames( |
| const RetransmittableFrames* retransmittable_frames) { |
| if (!retransmittable_frames) { |
| return net::QuicConnection::NO_FORCE; |
| } |
| for (size_t i = 0; i < retransmittable_frames->frames().size(); ++i) { |
| if (retransmittable_frames->frames()[i].type == CONNECTION_CLOSE_FRAME) { |
| return net::QuicConnection::FORCE; |
| } |
| } |
| return net::QuicConnection::NO_FORCE; |
| } |
| |
| net::IsHandshake HasCryptoHandshake( |
| const RetransmittableFrames* retransmittable_frames) { |
| if (!retransmittable_frames) { |
| return net::NOT_HANDSHAKE; |
| } |
| for (size_t i = 0; i < retransmittable_frames->frames().size(); ++i) { |
| if (retransmittable_frames->frames()[i].type == STREAM_FRAME && |
| retransmittable_frames->frames()[i].stream_frame->stream_id == |
| kCryptoStreamId) { |
| return net::IS_HANDSHAKE; |
| } |
| } |
| return net::NOT_HANDSHAKE; |
| } |
| |
| } // namespace |
| |
| #define ENDPOINT (is_server_ ? "Server: " : " Client: ") |
| |
| QuicConnection::QuicConnection(QuicGuid guid, |
| IPEndPoint address, |
| QuicConnectionHelperInterface* helper, |
| QuicPacketWriter* writer, |
| bool is_server, |
| const QuicVersionVector& supported_versions) |
| : framer_(supported_versions, |
| helper->GetClock()->ApproximateNow(), |
| is_server), |
| helper_(helper), |
| writer_(writer), |
| encryption_level_(ENCRYPTION_NONE), |
| clock_(helper->GetClock()), |
| random_generator_(helper->GetRandomGenerator()), |
| guid_(guid), |
| peer_address_(address), |
| largest_seen_packet_with_ack_(0), |
| pending_version_negotiation_packet_(false), |
| write_blocked_(false), |
| received_packet_manager_(kTCP), |
| ack_alarm_(helper->CreateAlarm(new AckAlarm(this))), |
| retransmission_alarm_(helper->CreateAlarm(new RetransmissionAlarm(this))), |
| send_alarm_(helper->CreateAlarm(new SendAlarm(this))), |
| resume_writes_alarm_(helper->CreateAlarm(new SendAlarm(this))), |
| timeout_alarm_(helper->CreateAlarm(new TimeoutAlarm(this))), |
| debug_visitor_(NULL), |
| packet_creator_(guid_, &framer_, random_generator_, is_server), |
| packet_generator_(this, NULL, &packet_creator_), |
| idle_network_timeout_( |
| QuicTime::Delta::FromSeconds(kDefaultInitialTimeoutSecs)), |
| overall_connection_timeout_(QuicTime::Delta::Infinite()), |
| creation_time_(clock_->ApproximateNow()), |
| time_of_last_received_packet_(clock_->ApproximateNow()), |
| time_of_last_sent_packet_(clock_->ApproximateNow()), |
| sequence_number_of_last_inorder_packet_(0), |
| sent_packet_manager_(is_server, this, clock_, kTCP), |
| version_negotiation_state_(START_NEGOTIATION), |
| is_server_(is_server), |
| connected_(true), |
| address_migrating_(false) { |
| if (!is_server_) { |
| // Pacing will be enabled if the client negotiates it. |
| sent_packet_manager_.MaybeEnablePacing(); |
| } |
| DVLOG(1) << ENDPOINT << "Created connection with guid: " << guid; |
| timeout_alarm_->Set(clock_->ApproximateNow().Add(idle_network_timeout_)); |
| framer_.set_visitor(this); |
| framer_.set_received_entropy_calculator(&received_packet_manager_); |
| } |
| |
| QuicConnection::~QuicConnection() { |
| STLDeleteElements(&undecryptable_packets_); |
| STLDeleteValues(&group_map_); |
| for (QueuedPacketList::iterator it = queued_packets_.begin(); |
| it != queued_packets_.end(); ++it) { |
| delete it->packet; |
| } |
| } |
| |
| void QuicConnection::SetFromConfig(const QuicConfig& config) { |
| DCHECK_LT(0u, config.server_initial_congestion_window()); |
| SetIdleNetworkTimeout(config.idle_connection_state_lifetime()); |
| sent_packet_manager_.SetFromConfig(config); |
| // TODO(satyamshekhar): Set congestion control and ICSL also. |
| } |
| |
| bool QuicConnection::SelectMutualVersion( |
| const QuicVersionVector& available_versions) { |
| // Try to find the highest mutual version by iterating over supported |
| // versions, starting with the highest, and breaking out of the loop once we |
| // find a matching version in the provided available_versions vector. |
| const QuicVersionVector& supported_versions = framer_.supported_versions(); |
| for (size_t i = 0; i < supported_versions.size(); ++i) { |
| const QuicVersion& version = supported_versions[i]; |
| if (std::find(available_versions.begin(), available_versions.end(), |
| version) != available_versions.end()) { |
| framer_.set_version(version); |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| void QuicConnection::OnError(QuicFramer* framer) { |
| // Packets that we cannot decrypt are dropped. |
| // TODO(rch): add stats to measure this. |
| if (!connected_ || framer->error() == QUIC_DECRYPTION_FAILURE) { |
| return; |
| } |
| SendConnectionCloseWithDetails(framer->error(), framer->detailed_error()); |
| } |
| |
| void QuicConnection::OnPacket() { |
| DCHECK(last_stream_frames_.empty() && |
| last_goaway_frames_.empty() && |
| last_rst_frames_.empty() && |
| last_ack_frames_.empty() && |
| last_congestion_frames_.empty()); |
| } |
| |
| void QuicConnection::OnPublicResetPacket( |
| const QuicPublicResetPacket& packet) { |
| if (debug_visitor_) { |
| debug_visitor_->OnPublicResetPacket(packet); |
| } |
| CloseConnection(QUIC_PUBLIC_RESET, true); |
| } |
| |
| bool QuicConnection::OnProtocolVersionMismatch(QuicVersion received_version) { |
| DVLOG(1) << ENDPOINT << "Received packet with mismatched version " |
| << received_version; |
| // TODO(satyamshekhar): Implement no server state in this mode. |
| if (!is_server_) { |
| LOG(DFATAL) << ENDPOINT << "Framer called OnProtocolVersionMismatch. " |
| << "Closing connection."; |
| CloseConnection(QUIC_INTERNAL_ERROR, false); |
| return false; |
| } |
| DCHECK_NE(version(), received_version); |
| |
| if (debug_visitor_) { |
| debug_visitor_->OnProtocolVersionMismatch(received_version); |
| } |
| |
| switch (version_negotiation_state_) { |
| case START_NEGOTIATION: |
| if (!framer_.IsSupportedVersion(received_version)) { |
| SendVersionNegotiationPacket(); |
| version_negotiation_state_ = NEGOTIATION_IN_PROGRESS; |
| return false; |
| } |
| break; |
| |
| case NEGOTIATION_IN_PROGRESS: |
| if (!framer_.IsSupportedVersion(received_version)) { |
| SendVersionNegotiationPacket(); |
| return false; |
| } |
| break; |
| |
| case NEGOTIATED_VERSION: |
| // Might be old packets that were sent by the client before the version |
| // was negotiated. Drop these. |
| return false; |
| |
| default: |
| DCHECK(false); |
| } |
| |
| version_negotiation_state_ = NEGOTIATED_VERSION; |
| visitor_->OnSuccessfulVersionNegotiation(received_version); |
| DVLOG(1) << ENDPOINT << "version negotiated " << received_version; |
| |
| // Store the new version. |
| framer_.set_version(received_version); |
| |
| // TODO(satyamshekhar): Store the sequence number of this packet and close the |
| // connection if we ever received a packet with incorrect version and whose |
| // sequence number is greater. |
| return true; |
| } |
| |
| // Handles version negotiation for client connection. |
| void QuicConnection::OnVersionNegotiationPacket( |
| const QuicVersionNegotiationPacket& packet) { |
| if (is_server_) { |
| LOG(DFATAL) << ENDPOINT << "Framer parsed VersionNegotiationPacket." |
| << " Closing connection."; |
| CloseConnection(QUIC_INTERNAL_ERROR, false); |
| return; |
| } |
| if (debug_visitor_) { |
| debug_visitor_->OnVersionNegotiationPacket(packet); |
| } |
| |
| if (version_negotiation_state_ != START_NEGOTIATION) { |
| // Possibly a duplicate version negotiation packet. |
| return; |
| } |
| |
| if (std::find(packet.versions.begin(), |
| packet.versions.end(), version()) != |
| packet.versions.end()) { |
| DLOG(WARNING) << ENDPOINT << "The server already supports our version. " |
| << "It should have accepted our connection."; |
| // Just drop the connection. |
| CloseConnection(QUIC_INVALID_VERSION_NEGOTIATION_PACKET, false); |
| return; |
| } |
| |
| if (!SelectMutualVersion(packet.versions)) { |
| SendConnectionCloseWithDetails(QUIC_INVALID_VERSION, |
| "no common version found"); |
| return; |
| } |
| |
| DVLOG(1) << ENDPOINT << "negotiating version " << version(); |
| server_supported_versions_ = packet.versions; |
| version_negotiation_state_ = NEGOTIATION_IN_PROGRESS; |
| RetransmitUnackedPackets(ALL_PACKETS); |
| } |
| |
| void QuicConnection::OnRevivedPacket() { |
| } |
| |
| bool QuicConnection::OnUnauthenticatedHeader(const QuicPacketHeader& header) { |
| return true; |
| } |
| |
| bool QuicConnection::OnPacketHeader(const QuicPacketHeader& header) { |
| if (debug_visitor_) { |
| debug_visitor_->OnPacketHeader(header); |
| } |
| |
| if (!ProcessValidatedPacket()) { |
| return false; |
| } |
| |
| // Will be decrement below if we fall through to return true; |
| ++stats_.packets_dropped; |
| |
| if (header.public_header.guid != guid_) { |
| DVLOG(1) << ENDPOINT << "Ignoring packet from unexpected GUID: " |
| << header.public_header.guid << " instead of " << guid_; |
| return false; |
| } |
| |
| if (!Near(header.packet_sequence_number, |
| last_header_.packet_sequence_number)) { |
| DVLOG(1) << ENDPOINT << "Packet " << header.packet_sequence_number |
| << " out of bounds. Discarding"; |
| SendConnectionCloseWithDetails(QUIC_INVALID_PACKET_HEADER, |
| "Packet sequence number out of bounds"); |
| return false; |
| } |
| |
| // If this packet has already been seen, or that the sender |
| // has told us will not be retransmitted, then stop processing the packet. |
| if (!received_packet_manager_.IsAwaitingPacket( |
| header.packet_sequence_number)) { |
| return false; |
| } |
| |
| if (version_negotiation_state_ != NEGOTIATED_VERSION) { |
| if (is_server_) { |
| if (!header.public_header.version_flag) { |
| DLOG(WARNING) << ENDPOINT << "Got packet without version flag before " |
| << "version negotiated."; |
| // Packets should have the version flag till version negotiation is |
| // done. |
| CloseConnection(QUIC_INVALID_VERSION, false); |
| return false; |
| } else { |
| DCHECK_EQ(1u, header.public_header.versions.size()); |
| DCHECK_EQ(header.public_header.versions[0], version()); |
| version_negotiation_state_ = NEGOTIATED_VERSION; |
| visitor_->OnSuccessfulVersionNegotiation(version()); |
| } |
| } else { |
| DCHECK(!header.public_header.version_flag); |
| // If the client gets a packet without the version flag from the server |
| // it should stop sending version since the version negotiation is done. |
| packet_creator_.StopSendingVersion(); |
| version_negotiation_state_ = NEGOTIATED_VERSION; |
| visitor_->OnSuccessfulVersionNegotiation(version()); |
| } |
| } |
| |
| DCHECK_EQ(NEGOTIATED_VERSION, version_negotiation_state_); |
| |
| --stats_.packets_dropped; |
| DVLOG(1) << ENDPOINT << "Received packet header: " << header; |
| last_header_ = header; |
| DCHECK(connected_); |
| return true; |
| } |
| |
| void QuicConnection::OnFecProtectedPayload(StringPiece payload) { |
| DCHECK_EQ(IN_FEC_GROUP, last_header_.is_in_fec_group); |
| DCHECK_NE(0u, last_header_.fec_group); |
| QuicFecGroup* group = GetFecGroup(); |
| if (group != NULL) { |
| group->Update(last_header_, payload); |
| } |
| } |
| |
| bool QuicConnection::OnStreamFrame(const QuicStreamFrame& frame) { |
| DCHECK(connected_); |
| if (debug_visitor_) { |
| debug_visitor_->OnStreamFrame(frame); |
| } |
| last_stream_frames_.push_back(frame); |
| return true; |
| } |
| |
| bool QuicConnection::OnAckFrame(const QuicAckFrame& incoming_ack) { |
| DCHECK(connected_); |
| if (debug_visitor_) { |
| debug_visitor_->OnAckFrame(incoming_ack); |
| } |
| DVLOG(1) << ENDPOINT << "OnAckFrame: " << incoming_ack; |
| |
| if (last_header_.packet_sequence_number <= largest_seen_packet_with_ack_) { |
| DVLOG(1) << ENDPOINT << "Received an old ack frame: ignoring"; |
| return true; |
| } |
| |
| if (!ValidateAckFrame(incoming_ack)) { |
| SendConnectionClose(QUIC_INVALID_ACK_DATA); |
| return false; |
| } |
| |
| last_ack_frames_.push_back(incoming_ack); |
| return connected_; |
| } |
| |
| void QuicConnection::ProcessAckFrame(const QuicAckFrame& incoming_ack) { |
| largest_seen_packet_with_ack_ = last_header_.packet_sequence_number; |
| |
| received_packet_manager_.UpdatePacketInformationReceivedByPeer(incoming_ack); |
| received_packet_manager_.UpdatePacketInformationSentByPeer(incoming_ack); |
| // Possibly close any FecGroups which are now irrelevant. |
| CloseFecGroupsBefore(incoming_ack.sent_info.least_unacked + 1); |
| |
| sent_entropy_manager_.ClearEntropyBefore( |
| received_packet_manager_.least_packet_awaited_by_peer() - 1); |
| |
| bool reset_retransmission_alarm = |
| sent_packet_manager_.OnIncomingAck(incoming_ack.received_info, |
| time_of_last_received_packet_); |
| if (sent_packet_manager_.HasPendingRetransmissions()) { |
| WriteIfNotBlocked(); |
| } |
| |
| if (reset_retransmission_alarm) { |
| retransmission_alarm_->Cancel(); |
| // Reset the RTO and FEC alarms if the are unacked packets. |
| if (sent_packet_manager_.HasUnackedPackets()) { |
| QuicTime::Delta retransmission_delay = |
| sent_packet_manager_.GetRetransmissionDelay(); |
| retransmission_alarm_->Set( |
| clock_->ApproximateNow().Add(retransmission_delay)); |
| } |
| } |
| } |
| |
| bool QuicConnection::OnCongestionFeedbackFrame( |
| const QuicCongestionFeedbackFrame& feedback) { |
| DCHECK(connected_); |
| if (debug_visitor_) { |
| debug_visitor_->OnCongestionFeedbackFrame(feedback); |
| } |
| last_congestion_frames_.push_back(feedback); |
| return connected_; |
| } |
| |
| bool QuicConnection::ValidateAckFrame(const QuicAckFrame& incoming_ack) { |
| if (incoming_ack.received_info.largest_observed > |
| packet_creator_.sequence_number()) { |
| DLOG(ERROR) << ENDPOINT << "Peer's observed unsent packet:" |
| << incoming_ack.received_info.largest_observed << " vs " |
| << packet_creator_.sequence_number(); |
| // We got an error for data we have not sent. Error out. |
| return false; |
| } |
| |
| if (incoming_ack.received_info.largest_observed < |
| received_packet_manager_.peer_largest_observed_packet()) { |
| DLOG(ERROR) << ENDPOINT << "Peer's largest_observed packet decreased:" |
| << incoming_ack.received_info.largest_observed << " vs " |
| << received_packet_manager_.peer_largest_observed_packet(); |
| // A new ack has a diminished largest_observed value. Error out. |
| // If this was an old packet, we wouldn't even have checked. |
| return false; |
| } |
| |
| if (incoming_ack.sent_info.least_unacked < |
| received_packet_manager_.peer_least_packet_awaiting_ack()) { |
| DLOG(ERROR) << ENDPOINT << "Peer's sent low least_unacked: " |
| << incoming_ack.sent_info.least_unacked << " vs " |
| << received_packet_manager_.peer_least_packet_awaiting_ack(); |
| // We never process old ack frames, so this number should only increase. |
| return false; |
| } |
| |
| if (incoming_ack.sent_info.least_unacked > |
| last_header_.packet_sequence_number) { |
| DLOG(ERROR) << ENDPOINT << "Peer sent least_unacked:" |
| << incoming_ack.sent_info.least_unacked |
| << " greater than the enclosing packet sequence number:" |
| << last_header_.packet_sequence_number; |
| return false; |
| } |
| |
| if (!incoming_ack.received_info.missing_packets.empty() && |
| *incoming_ack.received_info.missing_packets.rbegin() > |
| incoming_ack.received_info.largest_observed) { |
| DLOG(ERROR) << ENDPOINT << "Peer sent missing packet: " |
| << *incoming_ack.received_info.missing_packets.rbegin() |
| << " which is greater than largest observed: " |
| << incoming_ack.received_info.largest_observed; |
| return false; |
| } |
| |
| if (!incoming_ack.received_info.missing_packets.empty() && |
| *incoming_ack.received_info.missing_packets.begin() < |
| received_packet_manager_.least_packet_awaited_by_peer()) { |
| DLOG(ERROR) << ENDPOINT << "Peer sent missing packet: " |
| << *incoming_ack.received_info.missing_packets.begin() |
| << " which is smaller than least_packet_awaited_by_peer_: " |
| << received_packet_manager_.least_packet_awaited_by_peer(); |
| return false; |
| } |
| |
| if (!sent_entropy_manager_.IsValidEntropy( |
| incoming_ack.received_info.largest_observed, |
| incoming_ack.received_info.missing_packets, |
| incoming_ack.received_info.entropy_hash)) { |
| DLOG(ERROR) << ENDPOINT << "Peer sent invalid entropy."; |
| return false; |
| } |
| |
| return true; |
| } |
| |
| void QuicConnection::OnFecData(const QuicFecData& fec) { |
| DCHECK_EQ(IN_FEC_GROUP, last_header_.is_in_fec_group); |
| DCHECK_NE(0u, last_header_.fec_group); |
| QuicFecGroup* group = GetFecGroup(); |
| if (group != NULL) { |
| group->UpdateFec(last_header_.packet_sequence_number, |
| last_header_.entropy_flag, fec); |
| } |
| } |
| |
| bool QuicConnection::OnRstStreamFrame(const QuicRstStreamFrame& frame) { |
| DCHECK(connected_); |
| if (debug_visitor_) { |
| debug_visitor_->OnRstStreamFrame(frame); |
| } |
| DVLOG(1) << ENDPOINT << "Stream reset with error " |
| << QuicUtils::StreamErrorToString(frame.error_code); |
| last_rst_frames_.push_back(frame); |
| return connected_; |
| } |
| |
| bool QuicConnection::OnConnectionCloseFrame( |
| const QuicConnectionCloseFrame& frame) { |
| DCHECK(connected_); |
| if (debug_visitor_) { |
| debug_visitor_->OnConnectionCloseFrame(frame); |
| } |
| DVLOG(1) << ENDPOINT << "Connection " << guid() << " closed with error " |
| << QuicUtils::ErrorToString(frame.error_code) |
| << " " << frame.error_details; |
| last_close_frames_.push_back(frame); |
| return connected_; |
| } |
| |
| bool QuicConnection::OnGoAwayFrame(const QuicGoAwayFrame& frame) { |
| DCHECK(connected_); |
| DVLOG(1) << ENDPOINT << "Go away received with error " |
| << QuicUtils::ErrorToString(frame.error_code) |
| << " and reason:" << frame.reason_phrase; |
| last_goaway_frames_.push_back(frame); |
| return connected_; |
| } |
| |
| void QuicConnection::OnPacketComplete() { |
| // Don't do anything if this packet closed the connection. |
| if (!connected_) { |
| ClearLastFrames(); |
| return; |
| } |
| |
| DVLOG(1) << ENDPOINT << (last_packet_revived_ ? "Revived" : "Got") |
| << " packet " << last_header_.packet_sequence_number |
| << " with " << last_ack_frames_.size() << " acks, " |
| << last_congestion_frames_.size() << " congestions, " |
| << last_goaway_frames_.size() << " goaways, " |
| << last_rst_frames_.size() << " rsts, " |
| << last_close_frames_.size() << " closes, " |
| << last_stream_frames_.size() |
| << " stream frames for " << last_header_.public_header.guid; |
| |
| // Must called before ack processing, because processing acks removes entries |
| // from unacket_packets_, increasing the least_unacked. |
| const bool last_packet_should_instigate_ack = ShouldLastPacketInstigateAck(); |
| |
| // If the incoming packet was missing, send an ack immediately. |
| bool send_ack_immediately = received_packet_manager_.IsMissing( |
| last_header_.packet_sequence_number); |
| |
| // Ensure the visitor can process the stream frames before recording and |
| // processing the rest of the packet. |
| if (last_stream_frames_.empty() || |
| visitor_->OnStreamFrames(last_stream_frames_)) { |
| received_packet_manager_.RecordPacketReceived(last_size_, |
| last_header_, |
| time_of_last_received_packet_, |
| last_packet_revived_); |
| for (size_t i = 0; i < last_stream_frames_.size(); ++i) { |
| stats_.stream_bytes_received += |
| last_stream_frames_[i].data.TotalBufferSize(); |
| } |
| } |
| |
| // Process stream resets, then acks, then congestion feedback. |
| for (size_t i = 0; i < last_goaway_frames_.size(); ++i) { |
| visitor_->OnGoAway(last_goaway_frames_[i]); |
| } |
| for (size_t i = 0; i < last_rst_frames_.size(); ++i) { |
| visitor_->OnRstStream(last_rst_frames_[i]); |
| } |
| for (size_t i = 0; i < last_ack_frames_.size(); ++i) { |
| ProcessAckFrame(last_ack_frames_[i]); |
| } |
| for (size_t i = 0; i < last_congestion_frames_.size(); ++i) { |
| sent_packet_manager_.OnIncomingQuicCongestionFeedbackFrame( |
| last_congestion_frames_[i], time_of_last_received_packet_); |
| } |
| if (!last_close_frames_.empty()) { |
| CloseConnection(last_close_frames_[0].error_code, true); |
| DCHECK(!connected_); |
| } |
| |
| // If there are new missing packets to report, send an ack immediately. |
| if (received_packet_manager_.HasNewMissingPackets()) { |
| send_ack_immediately = true; |
| } |
| |
| MaybeSendInResponseToPacket(send_ack_immediately, |
| last_packet_should_instigate_ack); |
| |
| ClearLastFrames(); |
| } |
| |
| void QuicConnection::ClearLastFrames() { |
| last_stream_frames_.clear(); |
| last_goaway_frames_.clear(); |
| last_rst_frames_.clear(); |
| last_ack_frames_.clear(); |
| last_congestion_frames_.clear(); |
| } |
| |
| QuicAckFrame* QuicConnection::CreateAckFrame() { |
| QuicAckFrame* outgoing_ack = new QuicAckFrame(); |
| received_packet_manager_.UpdateReceivedPacketInfo( |
| &(outgoing_ack->received_info), clock_->ApproximateNow()); |
| UpdateSentPacketInfo(&(outgoing_ack->sent_info)); |
| DVLOG(1) << ENDPOINT << "Creating ack frame: " << *outgoing_ack; |
| return outgoing_ack; |
| } |
| |
| QuicCongestionFeedbackFrame* QuicConnection::CreateFeedbackFrame() { |
| return new QuicCongestionFeedbackFrame(outgoing_congestion_feedback_); |
| } |
| |
| bool QuicConnection::ShouldLastPacketInstigateAck() { |
| if (!last_stream_frames_.empty() || |
| !last_goaway_frames_.empty() || |
| !last_rst_frames_.empty()) { |
| return true; |
| } |
| |
| // If the peer is still waiting for a packet that we are no |
| // longer planning to send, we should send an ack to raise |
| // the high water mark. |
| if (!last_ack_frames_.empty() && |
| !last_ack_frames_.back().received_info.missing_packets.empty()) { |
| return sent_packet_manager_.GetLeastUnackedSentPacket() > |
| *last_ack_frames_.back().received_info.missing_packets.begin(); |
| } |
| return false; |
| } |
| |
| void QuicConnection::MaybeSendInResponseToPacket( |
| bool send_ack_immediately, |
| bool last_packet_should_instigate_ack) { |
| // |include_ack| is false since we decide about ack bundling below. |
| ScopedPacketBundler bundler(this, false); |
| |
| if (last_packet_should_instigate_ack) { |
| // In general, we ack every second packet. When we don't ack the first |
| // packet, we set the delayed ack alarm. Thus, if the ack alarm is set |
| // then we know this is the second packet, and we should send an ack. |
| if (send_ack_immediately || ack_alarm_->IsSet()) { |
| SendAck(); |
| DCHECK(!ack_alarm_->IsSet()); |
| } else { |
| ack_alarm_->Set(clock_->ApproximateNow().Add( |
| sent_packet_manager_.DelayedAckTime())); |
| DVLOG(1) << "Ack timer set; next packet or timer will trigger ACK."; |
| } |
| } |
| |
| if (!last_ack_frames_.empty()) { |
| // Now the we have received an ack, we might be able to send packets which |
| // are queued locally, or drain streams which are blocked. |
| QuicTime::Delta delay = sent_packet_manager_.TimeUntilSend( |
| time_of_last_received_packet_, NOT_RETRANSMISSION, |
| HAS_RETRANSMITTABLE_DATA, NOT_HANDSHAKE); |
| if (delay.IsZero()) { |
| send_alarm_->Cancel(); |
| WriteIfNotBlocked(); |
| } else if (!delay.IsInfinite()) { |
| send_alarm_->Cancel(); |
| send_alarm_->Set(time_of_last_received_packet_.Add(delay)); |
| } |
| } |
| } |
| |
| void QuicConnection::SendVersionNegotiationPacket() { |
| scoped_ptr<QuicEncryptedPacket> version_packet( |
| packet_creator_.SerializeVersionNegotiationPacket( |
| framer_.supported_versions())); |
| // TODO(satyamshekhar): implement zero server state negotiation. |
| WriteResult result = |
| writer_->WritePacket(version_packet->data(), version_packet->length(), |
| self_address().address(), peer_address(), this); |
| if (result.status == WRITE_STATUS_BLOCKED) { |
| write_blocked_ = true; |
| } |
| if (result.status == WRITE_STATUS_OK || |
| (result.status == WRITE_STATUS_BLOCKED && |
| writer_->IsWriteBlockedDataBuffered())) { |
| pending_version_negotiation_packet_ = false; |
| return; |
| } |
| if (result.status == WRITE_STATUS_ERROR) { |
| // We can't send an error as the socket is presumably borked. |
| CloseConnection(QUIC_PACKET_WRITE_ERROR, false); |
| } |
| pending_version_negotiation_packet_ = true; |
| } |
| |
| QuicConsumedData QuicConnection::SendStreamData( |
| QuicStreamId id, |
| const IOVector& data, |
| QuicStreamOffset offset, |
| bool fin, |
| QuicAckNotifier::DelegateInterface* delegate) { |
| if (!fin && data.Empty()) { |
| LOG(DFATAL) << "Attempt to send empty stream frame"; |
| } |
| |
| // This notifier will be owned by the AckNotifierManager (or deleted below if |
| // no data or FIN was consumed). |
| QuicAckNotifier* notifier = NULL; |
| if (delegate) { |
| notifier = new QuicAckNotifier(delegate); |
| } |
| |
| // Opportunistically bundle an ack with this outgoing packet, unless it's the |
| // crypto stream. |
| ScopedPacketBundler ack_bundler(this, id != kCryptoStreamId); |
| QuicConsumedData consumed_data = |
| packet_generator_.ConsumeData(id, data, offset, fin, notifier); |
| |
| if (notifier && |
| (consumed_data.bytes_consumed == 0 && !consumed_data.fin_consumed)) { |
| // No data was consumed, nor was a fin consumed, so delete the notifier. |
| delete notifier; |
| } |
| |
| return consumed_data; |
| } |
| |
| void QuicConnection::SendRstStream(QuicStreamId id, |
| QuicRstStreamErrorCode error) { |
| DVLOG(1) << "Sending RST_STREAM: " << id << " code: " << error; |
| // Opportunistically bundle an ack with this outgoing packet. |
| ScopedPacketBundler ack_bundler(this, true); |
| packet_generator_.AddControlFrame( |
| QuicFrame(new QuicRstStreamFrame(id, error))); |
| } |
| |
| const QuicConnectionStats& QuicConnection::GetStats() { |
| // Update rtt and estimated bandwidth. |
| stats_.rtt = sent_packet_manager_.SmoothedRtt().ToMicroseconds(); |
| stats_.estimated_bandwidth = |
| sent_packet_manager_.BandwidthEstimate().ToBytesPerSecond(); |
| return stats_; |
| } |
| |
| void QuicConnection::ProcessUdpPacket(const IPEndPoint& self_address, |
| const IPEndPoint& peer_address, |
| const QuicEncryptedPacket& packet) { |
| if (!connected_) { |
| return; |
| } |
| if (debug_visitor_) { |
| debug_visitor_->OnPacketReceived(self_address, peer_address, packet); |
| } |
| last_packet_revived_ = false; |
| last_size_ = packet.length(); |
| |
| address_migrating_ = false; |
| |
| if (peer_address_.address().empty()) { |
| peer_address_ = peer_address; |
| } |
| if (self_address_.address().empty()) { |
| self_address_ = self_address; |
| } |
| |
| if (!(peer_address == peer_address_ && self_address == self_address_)) { |
| address_migrating_ = true; |
| } |
| |
| stats_.bytes_received += packet.length(); |
| ++stats_.packets_received; |
| |
| if (!framer_.ProcessPacket(packet)) { |
| // If we are unable to decrypt this packet, it might be |
| // because the CHLO or SHLO packet was lost. |
| if (encryption_level_ != ENCRYPTION_FORWARD_SECURE && |
| framer_.error() == QUIC_DECRYPTION_FAILURE && |
| undecryptable_packets_.size() < kMaxUndecryptablePackets) { |
| QueueUndecryptablePacket(packet); |
| } |
| DVLOG(1) << ENDPOINT << "Unable to process packet. Last packet processed: " |
| << last_header_.packet_sequence_number; |
| return; |
| } |
| MaybeProcessUndecryptablePackets(); |
| MaybeProcessRevivedPacket(); |
| } |
| |
| bool QuicConnection::OnCanWrite() { |
| write_blocked_ = false; |
| return DoWrite(); |
| } |
| |
| bool QuicConnection::WriteIfNotBlocked() { |
| if (write_blocked_) { |
| return false; |
| } |
| return DoWrite(); |
| } |
| |
| bool QuicConnection::DoWrite() { |
| DCHECK(!write_blocked_); |
| WriteQueuedPackets(); |
| |
| WritePendingRetransmissions(); |
| |
| IsHandshake pending_handshake = visitor_->HasPendingHandshake() ? |
| IS_HANDSHAKE : NOT_HANDSHAKE; |
| // Sending queued packets may have caused the socket to become write blocked, |
| // or the congestion manager to prohibit sending. If we've sent everything |
| // we had queued and we're still not blocked, let the visitor know it can |
| // write more. |
| if (CanWrite(NOT_RETRANSMISSION, HAS_RETRANSMITTABLE_DATA, |
| pending_handshake)) { |
| // Set |include_ack| to false in bundler; ack inclusion happens elsewhere. |
| scoped_ptr<ScopedPacketBundler> bundler( |
| new ScopedPacketBundler(this, false)); |
| bool all_bytes_written = visitor_->OnCanWrite(); |
| bundler.reset(); |
| // After the visitor writes, it may have caused the socket to become write |
| // blocked or the congestion manager to prohibit sending, so check again. |
| pending_handshake = visitor_->HasPendingHandshake() ? IS_HANDSHAKE |
| : NOT_HANDSHAKE; |
| if (!all_bytes_written && !resume_writes_alarm_->IsSet() && |
| CanWrite(NOT_RETRANSMISSION, HAS_RETRANSMITTABLE_DATA, |
| pending_handshake)) { |
| // We're not write blocked, but some stream didn't write out all of its |
| // bytes. Register for 'immediate' resumption so we'll keep writing after |
| // other quic connections have had a chance to use the socket. |
| resume_writes_alarm_->Set(clock_->ApproximateNow()); |
| } |
| } |
| |
| return !write_blocked_; |
| } |
| |
| bool QuicConnection::ProcessValidatedPacket() { |
| if (address_migrating_) { |
| SendConnectionCloseWithDetails( |
| QUIC_ERROR_MIGRATING_ADDRESS, |
| "Address migration is not yet a supported feature"); |
| return false; |
| } |
| time_of_last_received_packet_ = clock_->Now(); |
| DVLOG(1) << ENDPOINT << "time of last received packet: " |
| << time_of_last_received_packet_.ToDebuggingValue(); |
| |
| if (is_server_ && encryption_level_ == ENCRYPTION_NONE && |
| last_size_ > options()->max_packet_length) { |
| options()->max_packet_length = last_size_; |
| } |
| return true; |
| } |
| |
| bool QuicConnection::WriteQueuedPackets() { |
| DCHECK(!write_blocked_); |
| |
| if (pending_version_negotiation_packet_) { |
| SendVersionNegotiationPacket(); |
| } |
| |
| QueuedPacketList::iterator packet_iterator = queued_packets_.begin(); |
| while (!write_blocked_ && packet_iterator != queued_packets_.end()) { |
| if (WritePacket(packet_iterator->encryption_level, |
| packet_iterator->sequence_number, |
| packet_iterator->packet, |
| packet_iterator->transmission_type, |
| packet_iterator->retransmittable, |
| packet_iterator->handshake, |
| packet_iterator->forced)) { |
| packet_iterator = queued_packets_.erase(packet_iterator); |
| } else { |
| // Continue, because some queued packets may still be writable. |
| // This can happen if a retransmit send fail. |
| ++packet_iterator; |
| } |
| } |
| |
| return !write_blocked_; |
| } |
| |
| void QuicConnection::WritePendingRetransmissions() { |
| // Keep writing as long as there's a pending retransmission which can be |
| // written. |
| while (sent_packet_manager_.HasPendingRetransmissions()) { |
| const QuicSentPacketManager::PendingRetransmission pending = |
| sent_packet_manager_.NextPendingRetransmission(); |
| if (HasForcedFrames(&pending.retransmittable_frames) == NO_FORCE && |
| !CanWrite(pending.transmission_type, HAS_RETRANSMITTABLE_DATA, |
| HasCryptoHandshake(&pending.retransmittable_frames))) { |
| break; |
| } |
| |
| // Re-packetize the frames with a new sequence number for retransmission. |
| // Retransmitted data packets do not use FEC, even when it's enabled. |
| // Retransmitted packets use the same sequence number length as the |
| // original. |
| // Flush the packet creator before making a new packet. |
| // TODO(ianswett): Implement ReserializeAllFrames as a separate path that |
| // does not require the creator to be flushed. |
| Flush(); |
| SerializedPacket serialized_packet = packet_creator_.ReserializeAllFrames( |
| pending.retransmittable_frames.frames(), |
| pending.sequence_number_length); |
| |
| DVLOG(1) << ENDPOINT << "Retransmitting " << pending.sequence_number |
| << " as " << serialized_packet.sequence_number; |
| if (debug_visitor_) { |
| debug_visitor_->OnPacketRetransmitted( |
| pending.sequence_number, serialized_packet.sequence_number); |
| } |
| sent_packet_manager_.OnRetransmittedPacket( |
| pending.sequence_number, serialized_packet.sequence_number); |
| |
| SendOrQueuePacket(pending.retransmittable_frames.encryption_level(), |
| serialized_packet, |
| pending.transmission_type); |
| } |
| } |
| |
| void QuicConnection::RetransmitUnackedPackets( |
| RetransmissionType retransmission_type) { |
| sent_packet_manager_.RetransmitUnackedPackets(retransmission_type); |
| |
| WriteIfNotBlocked(); |
| } |
| |
| bool QuicConnection::ShouldGeneratePacket( |
| TransmissionType transmission_type, |
| HasRetransmittableData retransmittable, |
| IsHandshake handshake) { |
| // We should serialize handshake packets immediately to ensure that they |
| // end up sent at the right encryption level. |
| if (handshake == IS_HANDSHAKE) { |
| return true; |
| } |
| |
| return CanWrite(transmission_type, retransmittable, handshake); |
| } |
| |
| bool QuicConnection::CanWrite(TransmissionType transmission_type, |
| HasRetransmittableData retransmittable, |
| IsHandshake handshake) { |
| if (write_blocked_) { |
| return false; |
| } |
| |
| // TODO(rch): consider removing this check so that if an ACK comes in |
| // before the alarm goes it, we might be able send out a packet. |
| // This check assumes that if the send alarm is set, it applies equally to all |
| // types of transmissions. |
| if (send_alarm_->IsSet()) { |
| DVLOG(1) << "Send alarm set. Not sending."; |
| return false; |
| } |
| |
| QuicTime now = clock_->Now(); |
| QuicTime::Delta delay = sent_packet_manager_.TimeUntilSend( |
| now, transmission_type, retransmittable, handshake); |
| if (delay.IsInfinite()) { |
| return false; |
| } |
| |
| // If the scheduler requires a delay, then we can not send this packet now. |
| if (!delay.IsZero()) { |
| send_alarm_->Cancel(); |
| send_alarm_->Set(now.Add(delay)); |
| DVLOG(1) << "Delaying sending."; |
| return false; |
| } |
| return true; |
| } |
| |
| void QuicConnection::SetupRetransmissionAlarm( |
| QuicPacketSequenceNumber sequence_number) { |
| if (!sent_packet_manager_.HasRetransmittableFrames(sequence_number)) { |
| DVLOG(1) << ENDPOINT << "Will not retransmit packet " << sequence_number; |
| return; |
| } |
| |
| // Do not set the retransmission alarm if we're already handling one, since |
| // it will be reset when OnRetransmissionTimeout completes. |
| if (retransmission_alarm_->IsSet()) { |
| return; |
| } |
| |
| QuicTime::Delta retransmission_delay = |
| sent_packet_manager_.GetRetransmissionDelay(); |
| retransmission_alarm_->Set( |
| clock_->ApproximateNow().Add(retransmission_delay)); |
| } |
| |
| bool QuicConnection::WritePacket(EncryptionLevel level, |
| QuicPacketSequenceNumber sequence_number, |
| QuicPacket* packet, |
| TransmissionType transmission_type, |
| HasRetransmittableData retransmittable, |
| IsHandshake handshake, |
| Force forced) { |
| if (ShouldDiscardPacket(level, sequence_number, retransmittable)) { |
| delete packet; |
| return true; |
| } |
| |
| // If we're write blocked, we know we can't write. |
| if (write_blocked_) { |
| return false; |
| } |
| |
| // If we are not forced and we can't write, then simply return false; |
| if (forced == NO_FORCE && |
| !CanWrite(transmission_type, retransmittable, handshake)) { |
| return false; |
| } |
| |
| // Some encryption algorithms require the packet sequence numbers not be |
| // repeated. |
| DCHECK_LE(sequence_number_of_last_inorder_packet_, sequence_number); |
| // Only increase this when packets have not been queued. Once they're queued |
| // due to a write block, there is the chance of sending forced and other |
| // higher priority packets out of order. |
| if (queued_packets_.empty()) { |
| sequence_number_of_last_inorder_packet_ = sequence_number; |
| } |
| |
| scoped_ptr<QuicEncryptedPacket> encrypted( |
| framer_.EncryptPacket(level, sequence_number, *packet)); |
| if (encrypted.get() == NULL) { |
| LOG(DFATAL) << ENDPOINT << "Failed to encrypt packet number " |
| << sequence_number; |
| CloseConnection(QUIC_ENCRYPTION_FAILURE, false); |
| return false; |
| } |
| |
| // If it's the ConnectionClose packet, the only FORCED frame type, |
| // clone a copy for resending later by the TimeWaitListManager. |
| if (forced == FORCE) { |
| DCHECK(connection_close_packet_.get() == NULL); |
| connection_close_packet_.reset(encrypted->Clone()); |
| } |
| |
| if (encrypted->length() > options()->max_packet_length) { |
| LOG(DFATAL) << "Writing an encrypted packet larger than max_packet_length:" |
| << options()->max_packet_length << " encrypted length: " |
| << encrypted->length(); |
| } |
| DVLOG(1) << ENDPOINT << "Sending packet number " << sequence_number |
| << " : " << (packet->is_fec_packet() ? "FEC " : |
| (retransmittable == HAS_RETRANSMITTABLE_DATA |
| ? "data bearing " : " ack only ")) |
| << ", encryption level: " |
| << QuicUtils::EncryptionLevelToString(level) |
| << ", length:" << packet->length() << ", encrypted length:" |
| << encrypted->length(); |
| DVLOG(2) << ENDPOINT << "packet(" << sequence_number << "): " << std::endl |
| << QuicUtils::StringToHexASCIIDump(packet->AsStringPiece()); |
| |
| DCHECK(encrypted->length() <= kMaxPacketSize) |
| << "Packet " << sequence_number << " will not be read; too large: " |
| << packet->length() << " " << encrypted->length() << " " |
| << " forced: " << (forced == FORCE ? "yes" : "no"); |
| |
| DCHECK(pending_write_.get() == NULL); |
| pending_write_.reset(new PendingWrite(sequence_number, transmission_type, |
| retransmittable, level, |
| packet->is_fec_packet(), |
| packet->length())); |
| |
| WriteResult result = |
| writer_->WritePacket(encrypted->data(), encrypted->length(), |
| self_address().address(), peer_address(), this); |
| if (result.error_code == ERR_IO_PENDING) { |
| DCHECK_EQ(WRITE_STATUS_BLOCKED, result.status); |
| } |
| if (debug_visitor_) { |
| // Pass the write result to the visitor. |
| debug_visitor_->OnPacketSent(sequence_number, level, *encrypted, result); |
| } |
| if (result.status == WRITE_STATUS_BLOCKED) { |
| // TODO(satyashekhar): It might be more efficient (fewer system calls), if |
| // all connections share this variable i.e this becomes a part of |
| // PacketWriterInterface. |
| write_blocked_ = true; |
| // If the socket buffers the the data, then the packet should not |
| // be queued and sent again, which would result in an unnecessary |
| // duplicate packet being sent. The helper must call OnPacketSent |
| // when the packet is actually sent. |
| if (writer_->IsWriteBlockedDataBuffered()) { |
| delete packet; |
| return true; |
| } |
| pending_write_.reset(); |
| return false; |
| } |
| |
| if (OnPacketSent(result)) { |
| delete packet; |
| return true; |
| } |
| return false; |
| } |
| |
| bool QuicConnection::ShouldDiscardPacket( |
| EncryptionLevel level, |
| QuicPacketSequenceNumber sequence_number, |
| HasRetransmittableData retransmittable) { |
| if (!connected_) { |
| DVLOG(1) << ENDPOINT |
| << "Not sending packet as connection is disconnected."; |
| return true; |
| } |
| |
| if (encryption_level_ == ENCRYPTION_FORWARD_SECURE && |
| level == ENCRYPTION_NONE) { |
| // Drop packets that are NULL encrypted since the peer won't accept them |
| // anymore. |
| DVLOG(1) << ENDPOINT << "Dropping packet: " << sequence_number |
| << " since the packet is NULL encrypted."; |
| sent_packet_manager_.DiscardUnackedPacket(sequence_number); |
| return true; |
| } |
| |
| if (retransmittable == HAS_RETRANSMITTABLE_DATA) { |
| if (!sent_packet_manager_.IsUnacked(sequence_number)) { |
| // This is a crazy edge case, but if we retransmit a packet, |
| // (but have to queue it for some reason) then receive an ack |
| // for the previous transmission (but not the retransmission) |
| // then receive a truncated ACK which causes us to raise the |
| // high water mark, all before we're able to send the packet |
| // then we can simply drop it. |
| DVLOG(1) << ENDPOINT << "Dropping packet: " << sequence_number |
| << " since it has already been acked."; |
| return true; |
| } |
| |
| if (sent_packet_manager_.IsPreviousTransmission(sequence_number)) { |
| // If somehow we have already retransmitted this packet *before* |
| // we actually send it for the first time (I think this is probably |
| // impossible in the real world), then don't bother sending it. |
| // We don't want to call DiscardUnackedPacket because in this case |
| // the peer has not yet ACK'd the data. We need the subsequent |
| // retransmission to be sent. |
| DVLOG(1) << ENDPOINT << "Dropping packet: " << sequence_number |
| << " since it has already been retransmitted."; |
| return true; |
| } |
| |
| if (!sent_packet_manager_.HasRetransmittableFrames(sequence_number)) { |
| DVLOG(1) << ENDPOINT << "Dropping packet: " << sequence_number |
| << " since a previous transmission has been acked."; |
| sent_packet_manager_.DiscardUnackedPacket(sequence_number); |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| bool QuicConnection::OnPacketSent(WriteResult result) { |
| DCHECK_NE(WRITE_STATUS_BLOCKED, result.status); |
| if (pending_write_.get() == NULL) { |
| LOG(DFATAL) << "OnPacketSent called without a pending write."; |
| return false; |
| } |
| |
| QuicPacketSequenceNumber sequence_number = pending_write_->sequence_number; |
| TransmissionType transmission_type = pending_write_->transmission_type; |
| HasRetransmittableData retransmittable = pending_write_->retransmittable; |
| bool is_fec_packet = pending_write_->is_fec_packet; |
| size_t length = pending_write_->length; |
| pending_write_.reset(); |
| |
| if (result.status == WRITE_STATUS_ERROR) { |
| DVLOG(1) << "Write failed with error code: " << result.error_code; |
| // We can't send an error as the socket is presumably borked. |
| CloseConnection(QUIC_PACKET_WRITE_ERROR, false); |
| return false; |
| } |
| |
| QuicTime now = clock_->Now(); |
| if (transmission_type == NOT_RETRANSMISSION) { |
| time_of_last_sent_packet_ = now; |
| } |
| DVLOG(1) << ENDPOINT << "time of last sent packet: " |
| << now.ToDebuggingValue(); |
| |
| // Set the retransmit alarm only when we have sent the packet to the client |
| // and not when it goes to the pending queue, otherwise we will end up adding |
| // an entry to retransmission_timeout_ every time we attempt a write. |
| if (retransmittable == HAS_RETRANSMITTABLE_DATA || is_fec_packet) { |
| SetupRetransmissionAlarm(sequence_number); |
| } |
| |
| // TODO(ianswett): Change the sequence number length and other packet creator |
| // options by a more explicit API than setting a struct value directly. |
| packet_creator_.UpdateSequenceNumberLength( |
| received_packet_manager_.least_packet_awaited_by_peer(), |
| sent_packet_manager_.BandwidthEstimate().ToBytesPerPeriod( |
| sent_packet_manager_.SmoothedRtt())); |
| |
| sent_packet_manager_.OnPacketSent(sequence_number, now, length, |
| transmission_type, retransmittable); |
| |
| stats_.bytes_sent += result.bytes_written; |
| ++stats_.packets_sent; |
| |
| if (transmission_type == NACK_RETRANSMISSION || |
| transmission_type == RTO_RETRANSMISSION) { |
| stats_.bytes_retransmitted += result.bytes_written; |
| ++stats_.packets_retransmitted; |
| } |
| |
| return true; |
| } |
| |
| bool QuicConnection::OnSerializedPacket( |
| const SerializedPacket& serialized_packet) { |
| if (serialized_packet.retransmittable_frames) { |
| serialized_packet.retransmittable_frames-> |
| set_encryption_level(encryption_level_); |
| } |
| sent_packet_manager_.OnSerializedPacket(serialized_packet); |
| // The TransmissionType is NOT_RETRANSMISSION because all retransmissions |
| // serialize packets and invoke SendOrQueuePacket directly. |
| return SendOrQueuePacket(encryption_level_, |
| serialized_packet, |
| NOT_RETRANSMISSION); |
| } |
| |
| QuicPacketSequenceNumber QuicConnection::GetNextPacketSequenceNumber() { |
| return packet_creator_.sequence_number() + 1; |
| } |
| |
| bool QuicConnection::SendOrQueuePacket(EncryptionLevel level, |
| const SerializedPacket& packet, |
| TransmissionType transmission_type) { |
| IsHandshake handshake = HasCryptoHandshake(packet.retransmittable_frames); |
| Force forced = HasForcedFrames(packet.retransmittable_frames); |
| HasRetransmittableData retransmittable = |
| (transmission_type != NOT_RETRANSMISSION || |
| packet.retransmittable_frames != NULL) ? |
| HAS_RETRANSMITTABLE_DATA : NO_RETRANSMITTABLE_DATA; |
| sent_entropy_manager_.RecordPacketEntropyHash(packet.sequence_number, |
| packet.entropy_hash); |
| if (WritePacket(level, packet.sequence_number, packet.packet, |
| transmission_type, retransmittable, handshake, forced)) { |
| return true; |
| } |
| queued_packets_.push_back(QueuedPacket(packet.sequence_number, packet.packet, |
| level, transmission_type, |
| retransmittable, handshake, forced)); |
| return false; |
| } |
| |
| void QuicConnection::UpdateSentPacketInfo(SentPacketInfo* sent_info) { |
| sent_info->least_unacked = sent_packet_manager_.GetLeastUnackedSentPacket(); |
| sent_info->entropy_hash = sent_entropy_manager_.EntropyHash( |
| sent_info->least_unacked - 1); |
| } |
| |
| void QuicConnection::SendAck() { |
| ack_alarm_->Cancel(); |
| // TODO(rch): delay this until the CreateFeedbackFrame |
| // method is invoked. This requires changes SetShouldSendAck |
| // to be a no-arg method, and re-jiggering its implementation. |
| bool send_feedback = false; |
| if (received_packet_manager_.GenerateCongestionFeedback( |
| &outgoing_congestion_feedback_)) { |
| DVLOG(1) << ENDPOINT << "Sending feedback: " |
| << outgoing_congestion_feedback_; |
| send_feedback = true; |
| } |
| |
| packet_generator_.SetShouldSendAck(send_feedback); |
| } |
| |
| void QuicConnection::OnRetransmissionTimeout() { |
| if (!sent_packet_manager_.HasUnackedPackets()) { |
| return; |
| } |
| |
| ++stats_.rto_count; |
| |
| sent_packet_manager_.OnRetransmissionTimeout(); |
| |
| WriteIfNotBlocked(); |
| |
| // Ensure the retransmission alarm is always set if there are unacked packets. |
| if (sent_packet_manager_.HasUnackedPackets() && !HasQueuedData() && |
| !retransmission_alarm_->IsSet()) { |
| QuicTime rto_timeout = clock_->ApproximateNow().Add( |
| sent_packet_manager_.GetRetransmissionDelay()); |
| retransmission_alarm_->Set(rto_timeout); |
| } |
| } |
| |
| void QuicConnection::SetEncrypter(EncryptionLevel level, |
| QuicEncrypter* encrypter) { |
| framer_.SetEncrypter(level, encrypter); |
| } |
| |
| const QuicEncrypter* QuicConnection::encrypter(EncryptionLevel level) const { |
| return framer_.encrypter(level); |
| } |
| |
| void QuicConnection::SetDefaultEncryptionLevel( |
| EncryptionLevel level) { |
| encryption_level_ = level; |
| } |
| |
| void QuicConnection::SetDecrypter(QuicDecrypter* decrypter) { |
| framer_.SetDecrypter(decrypter); |
| } |
| |
| void QuicConnection::SetAlternativeDecrypter(QuicDecrypter* decrypter, |
| bool latch_once_used) { |
| framer_.SetAlternativeDecrypter(decrypter, latch_once_used); |
| } |
| |
| const QuicDecrypter* QuicConnection::decrypter() const { |
| return framer_.decrypter(); |
| } |
| |
| const QuicDecrypter* QuicConnection::alternative_decrypter() const { |
| return framer_.alternative_decrypter(); |
| } |
| |
| void QuicConnection::QueueUndecryptablePacket( |
| const QuicEncryptedPacket& packet) { |
| DVLOG(1) << ENDPOINT << "Queueing undecryptable packet."; |
| undecryptable_packets_.push_back(packet.Clone()); |
| } |
| |
| void QuicConnection::MaybeProcessUndecryptablePackets() { |
| if (undecryptable_packets_.empty() || |
| encryption_level_ == ENCRYPTION_NONE) { |
| return; |
| } |
| |
| while (connected_ && !undecryptable_packets_.empty()) { |
| DVLOG(1) << ENDPOINT << "Attempting to process undecryptable packet"; |
| QuicEncryptedPacket* packet = undecryptable_packets_.front(); |
| if (!framer_.ProcessPacket(*packet) && |
| framer_.error() == QUIC_DECRYPTION_FAILURE) { |
| DVLOG(1) << ENDPOINT << "Unable to process undecryptable packet..."; |
| break; |
| } |
| DVLOG(1) << ENDPOINT << "Processed undecryptable packet!"; |
| delete packet; |
| undecryptable_packets_.pop_front(); |
| } |
| |
| // Once forward secure encryption is in use, there will be no |
| // new keys installed and hence any undecryptable packets will |
| // never be able to be decrypted. |
| if (encryption_level_ == ENCRYPTION_FORWARD_SECURE) { |
| STLDeleteElements(&undecryptable_packets_); |
| } |
| } |
| |
| void QuicConnection::MaybeProcessRevivedPacket() { |
| QuicFecGroup* group = GetFecGroup(); |
| if (!connected_ || group == NULL || !group->CanRevive()) { |
| return; |
| } |
| QuicPacketHeader revived_header; |
| char revived_payload[kMaxPacketSize]; |
| size_t len = group->Revive(&revived_header, revived_payload, kMaxPacketSize); |
| revived_header.public_header.guid = guid_; |
| revived_header.public_header.version_flag = false; |
| revived_header.public_header.reset_flag = false; |
| revived_header.fec_flag = false; |
| revived_header.is_in_fec_group = NOT_IN_FEC_GROUP; |
| revived_header.fec_group = 0; |
| group_map_.erase(last_header_.fec_group); |
| delete group; |
| |
| last_packet_revived_ = true; |
| if (debug_visitor_) { |
| debug_visitor_->OnRevivedPacket(revived_header, |
| StringPiece(revived_payload, len)); |
| } |
| |
| ++stats_.packets_revived; |
| framer_.ProcessRevivedPacket(&revived_header, |
| StringPiece(revived_payload, len)); |
| } |
| |
| QuicFecGroup* QuicConnection::GetFecGroup() { |
| QuicFecGroupNumber fec_group_num = last_header_.fec_group; |
| if (fec_group_num == 0) { |
| return NULL; |
| } |
| if (group_map_.count(fec_group_num) == 0) { |
| if (group_map_.size() >= kMaxFecGroups) { // Too many groups |
| if (fec_group_num < group_map_.begin()->first) { |
| // The group being requested is a group we've seen before and deleted. |
| // Don't recreate it. |
| return NULL; |
| } |
| // Clear the lowest group number. |
| delete group_map_.begin()->second; |
| group_map_.erase(group_map_.begin()); |
| } |
| group_map_[fec_group_num] = new QuicFecGroup(); |
| } |
| return group_map_[fec_group_num]; |
| } |
| |
| void QuicConnection::SendConnectionClose(QuicErrorCode error) { |
| SendConnectionCloseWithDetails(error, string()); |
| } |
| |
| void QuicConnection::SendConnectionCloseWithDetails(QuicErrorCode error, |
| const string& details) { |
| if (!write_blocked_) { |
| SendConnectionClosePacket(error, details); |
| } |
| CloseConnection(error, false); |
| } |
| |
| void QuicConnection::SendConnectionClosePacket(QuicErrorCode error, |
| const string& details) { |
| DVLOG(1) << ENDPOINT << "Force closing " << guid() << " with error " |
| << QuicUtils::ErrorToString(error) << " (" << error << ") " |
| << details; |
| ScopedPacketBundler ack_bundler(this, true); |
| QuicConnectionCloseFrame* frame = new QuicConnectionCloseFrame(); |
| frame->error_code = error; |
| frame->error_details = details; |
| packet_generator_.AddControlFrame(QuicFrame(frame)); |
| Flush(); |
| } |
| |
| void QuicConnection::CloseConnection(QuicErrorCode error, bool from_peer) { |
| DCHECK(connected_); |
| connected_ = false; |
| visitor_->OnConnectionClosed(error, from_peer); |
| // Cancel the alarms so they don't trigger any action now that the |
| // connection is closed. |
| ack_alarm_->Cancel(); |
| resume_writes_alarm_->Cancel(); |
| retransmission_alarm_->Cancel(); |
| send_alarm_->Cancel(); |
| timeout_alarm_->Cancel(); |
| } |
| |
| void QuicConnection::SendGoAway(QuicErrorCode error, |
| QuicStreamId last_good_stream_id, |
| const string& reason) { |
| DVLOG(1) << ENDPOINT << "Going away with error " |
| << QuicUtils::ErrorToString(error) |
| << " (" << error << ")"; |
| |
| // Opportunistically bundle an ack with this outgoing packet. |
| ScopedPacketBundler ack_bundler(this, true); |
| packet_generator_.AddControlFrame( |
| QuicFrame(new QuicGoAwayFrame(error, last_good_stream_id, reason))); |
| } |
| |
| void QuicConnection::CloseFecGroupsBefore( |
| QuicPacketSequenceNumber sequence_number) { |
| FecGroupMap::iterator it = group_map_.begin(); |
| while (it != group_map_.end()) { |
| // If this is the current group or the group doesn't protect this packet |
| // we can ignore it. |
| if (last_header_.fec_group == it->first || |
| !it->second->ProtectsPacketsBefore(sequence_number)) { |
| ++it; |
| continue; |
| } |
| QuicFecGroup* fec_group = it->second; |
| DCHECK(!fec_group->CanRevive()); |
| FecGroupMap::iterator next = it; |
| ++next; |
| group_map_.erase(it); |
| delete fec_group; |
| it = next; |
| } |
| } |
| |
| void QuicConnection::Flush() { |
| packet_generator_.FlushAllQueuedFrames(); |
| } |
| |
| bool QuicConnection::HasQueuedData() const { |
| return pending_version_negotiation_packet_ || |
| !queued_packets_.empty() || packet_generator_.HasQueuedFrames(); |
| } |
| |
| void QuicConnection::SetIdleNetworkTimeout(QuicTime::Delta timeout) { |
| if (timeout < idle_network_timeout_) { |
| idle_network_timeout_ = timeout; |
| CheckForTimeout(); |
| } else { |
| idle_network_timeout_ = timeout; |
| } |
| } |
| |
| void QuicConnection::SetOverallConnectionTimeout(QuicTime::Delta timeout) { |
| if (timeout < overall_connection_timeout_) { |
| overall_connection_timeout_ = timeout; |
| CheckForTimeout(); |
| } else { |
| overall_connection_timeout_ = timeout; |
| } |
| } |
| |
| bool QuicConnection::CheckForTimeout() { |
| QuicTime now = clock_->ApproximateNow(); |
| QuicTime time_of_last_packet = std::max(time_of_last_received_packet_, |
| time_of_last_sent_packet_); |
| |
| // |delta| can be < 0 as |now| is approximate time but |time_of_last_packet| |
| // is accurate time. However, this should not change the behavior of |
| // timeout handling. |
| QuicTime::Delta delta = now.Subtract(time_of_last_packet); |
| DVLOG(1) << ENDPOINT << "last packet " |
| << time_of_last_packet.ToDebuggingValue() |
| << " now:" << now.ToDebuggingValue() |
| << " delta:" << delta.ToMicroseconds() |
| << " network_timeout: " << idle_network_timeout_.ToMicroseconds(); |
| if (delta >= idle_network_timeout_) { |
| DVLOG(1) << ENDPOINT << "Connection timedout due to no network activity."; |
| SendConnectionClose(QUIC_CONNECTION_TIMED_OUT); |
| return true; |
| } |
| |
| // Next timeout delta. |
| QuicTime::Delta timeout = idle_network_timeout_.Subtract(delta); |
| |
| if (!overall_connection_timeout_.IsInfinite()) { |
| QuicTime::Delta connected_time = now.Subtract(creation_time_); |
| DVLOG(1) << ENDPOINT << "connection time: " |
| << connected_time.ToMilliseconds() << " overall timeout: " |
| << overall_connection_timeout_.ToMilliseconds(); |
| if (connected_time >= overall_connection_timeout_) { |
| DVLOG(1) << ENDPOINT << |
| "Connection timedout due to overall connection timeout."; |
| SendConnectionClose(QUIC_CONNECTION_TIMED_OUT); |
| return true; |
| } |
| |
| // Take the min timeout. |
| QuicTime::Delta connection_timeout = |
| overall_connection_timeout_.Subtract(connected_time); |
| if (connection_timeout < timeout) { |
| timeout = connection_timeout; |
| } |
| } |
| |
| timeout_alarm_->Cancel(); |
| timeout_alarm_->Set(clock_->ApproximateNow().Add(timeout)); |
| return false; |
| } |
| |
| QuicConnection::ScopedPacketBundler::ScopedPacketBundler( |
| QuicConnection* connection, |
| bool include_ack) |
| : connection_(connection), |
| already_in_batch_mode_(connection->packet_generator_.InBatchMode()) { |
| // Move generator into batch mode. If caller wants us to include an ack, |
| // check the delayed-ack timer to see if there's ack info to be sent. |
| if (!already_in_batch_mode_) { |
| DVLOG(1) << "Entering Batch Mode."; |
| connection_->packet_generator_.StartBatchOperations(); |
| } |
| if (include_ack && connection_->ack_alarm_->IsSet()) { |
| DVLOG(1) << "Bundling ack with outgoing packet."; |
| connection_->SendAck(); |
| } |
| } |
| |
| QuicConnection::ScopedPacketBundler::~ScopedPacketBundler() { |
| // If we changed the generator's batch state, restore original batch state. |
| if (!already_in_batch_mode_) { |
| DVLOG(1) << "Leaving Batch Mode."; |
| connection_->packet_generator_.FinishBatchOperations(); |
| } |
| DCHECK_EQ(already_in_batch_mode_, |
| connection_->packet_generator_.InBatchMode()); |
| } |
| |
| } // namespace net |