blob: bf97fbc646d9a5b67fa26e17fe303c26cd9d89f1 [file] [log] [blame]
// 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_connection.h"
#include <string.h>
#include <sys/types.h>
#include <algorithm>
#include <iterator>
#include <limits>
#include <memory>
#include <set>
#include <string>
#include <utility>
#include "net/third_party/quiche/src/quic/core/crypto/crypto_protocol.h"
#include "net/third_party/quiche/src/quic/core/crypto/crypto_utils.h"
#include "net/third_party/quiche/src/quic/core/crypto/quic_decrypter.h"
#include "net/third_party/quiche/src/quic/core/crypto/quic_encrypter.h"
#include "net/third_party/quiche/src/quic/core/proto/cached_network_parameters_proto.h"
#include "net/third_party/quiche/src/quic/core/quic_bandwidth.h"
#include "net/third_party/quiche/src/quic/core/quic_config.h"
#include "net/third_party/quiche/src/quic/core/quic_connection_id.h"
#include "net/third_party/quiche/src/quic/core/quic_constants.h"
#include "net/third_party/quiche/src/quic/core/quic_error_codes.h"
#include "net/third_party/quiche/src/quic/core/quic_legacy_version_encapsulator.h"
#include "net/third_party/quiche/src/quic/core/quic_packet_creator.h"
#include "net/third_party/quiche/src/quic/core/quic_types.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_client_stats.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_error_code_wrappers.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_exported_stats.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_hostname_utils.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_logging.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_map_util.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_socket_address.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_string_utils.h"
#include "net/third_party/quiche/src/common/platform/api/quiche_str_cat.h"
#include "net/third_party/quiche/src/common/platform/api/quiche_string_piece.h"
#include "net/third_party/quiche/src/common/platform/api/quiche_text_utils.h"
namespace quic {
class QuicDecrypter;
class QuicEncrypter;
namespace {
// Maximum number of consecutive sent nonretransmittable packets.
const QuicPacketCount kMaxConsecutiveNonRetransmittablePackets = 19;
// The minimum release time into future in ms.
const int kMinReleaseTimeIntoFutureMs = 1;
// An alarm that is scheduled to send an ack if a timeout occurs.
class AckAlarmDelegate : public QuicAlarm::Delegate {
public:
explicit AckAlarmDelegate(QuicConnection* connection)
: connection_(connection) {}
AckAlarmDelegate(const AckAlarmDelegate&) = delete;
AckAlarmDelegate& operator=(const AckAlarmDelegate&) = delete;
void OnAlarm() override {
DCHECK(connection_->ack_frame_updated());
DCHECK(connection_->connected());
QuicConnection::ScopedPacketFlusher flusher(connection_);
if (connection_->SupportsMultiplePacketNumberSpaces()) {
connection_->SendAllPendingAcks();
} else {
connection_->SendAck();
}
}
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 RetransmissionAlarmDelegate : public QuicAlarm::Delegate {
public:
explicit RetransmissionAlarmDelegate(QuicConnection* connection)
: connection_(connection) {}
RetransmissionAlarmDelegate(const RetransmissionAlarmDelegate&) = delete;
RetransmissionAlarmDelegate& operator=(const RetransmissionAlarmDelegate&) =
delete;
void OnAlarm() override {
DCHECK(connection_->connected());
connection_->OnRetransmissionTimeout();
}
private:
QuicConnection* connection_;
};
// An alarm that is scheduled when the SentPacketManager requires a delay
// before sending packets and fires when the packet may be sent.
class SendAlarmDelegate : public QuicAlarm::Delegate {
public:
explicit SendAlarmDelegate(QuicConnection* connection)
: connection_(connection) {}
SendAlarmDelegate(const SendAlarmDelegate&) = delete;
SendAlarmDelegate& operator=(const SendAlarmDelegate&) = delete;
void OnAlarm() override {
DCHECK(connection_->connected());
connection_->WriteAndBundleAcksIfNotBlocked();
}
private:
QuicConnection* connection_;
};
class PingAlarmDelegate : public QuicAlarm::Delegate {
public:
explicit PingAlarmDelegate(QuicConnection* connection)
: connection_(connection) {}
PingAlarmDelegate(const PingAlarmDelegate&) = delete;
PingAlarmDelegate& operator=(const PingAlarmDelegate&) = delete;
void OnAlarm() override {
DCHECK(connection_->connected());
connection_->OnPingTimeout();
}
private:
QuicConnection* connection_;
};
class MtuDiscoveryAlarmDelegate : public QuicAlarm::Delegate {
public:
explicit MtuDiscoveryAlarmDelegate(QuicConnection* connection)
: connection_(connection) {}
MtuDiscoveryAlarmDelegate(const MtuDiscoveryAlarmDelegate&) = delete;
MtuDiscoveryAlarmDelegate& operator=(const MtuDiscoveryAlarmDelegate&) =
delete;
void OnAlarm() override {
DCHECK(connection_->connected());
connection_->DiscoverMtu();
}
private:
QuicConnection* connection_;
};
class ProcessUndecryptablePacketsAlarmDelegate : public QuicAlarm::Delegate {
public:
explicit ProcessUndecryptablePacketsAlarmDelegate(QuicConnection* connection)
: connection_(connection) {}
ProcessUndecryptablePacketsAlarmDelegate(
const ProcessUndecryptablePacketsAlarmDelegate&) = delete;
ProcessUndecryptablePacketsAlarmDelegate& operator=(
const ProcessUndecryptablePacketsAlarmDelegate&) = delete;
void OnAlarm() override {
DCHECK(connection_->connected());
QuicConnection::ScopedPacketFlusher flusher(connection_);
connection_->MaybeProcessUndecryptablePackets();
}
private:
QuicConnection* connection_;
};
// When the clearer goes out of scope, the coalesced packet gets cleared.
class ScopedCoalescedPacketClearer {
public:
explicit ScopedCoalescedPacketClearer(QuicCoalescedPacket* coalesced)
: coalesced_(coalesced) {}
~ScopedCoalescedPacketClearer() { coalesced_->Clear(); }
private:
QuicCoalescedPacket* coalesced_; // Unowned.
};
// Whether this incoming packet is allowed to replace our connection ID.
bool PacketCanReplaceConnectionId(const QuicPacketHeader& header,
Perspective perspective) {
return perspective == Perspective::IS_CLIENT &&
header.form == IETF_QUIC_LONG_HEADER_PACKET &&
header.version.IsKnown() &&
header.version.AllowsVariableLengthConnectionIds() &&
(header.long_packet_type == INITIAL ||
header.long_packet_type == RETRY);
}
CongestionControlType GetDefaultCongestionControlType() {
if (GetQuicReloadableFlag(quic_default_to_bbr_v2)) {
return kBBRv2;
}
if (GetQuicReloadableFlag(quic_default_to_bbr)) {
return kBBR;
}
return kCubicBytes;
}
} // namespace
#define ENDPOINT \
(perspective_ == Perspective::IS_SERVER ? "Server: " : "Client: ")
QuicConnection::QuicConnection(
QuicConnectionId server_connection_id,
QuicSocketAddress initial_peer_address,
QuicConnectionHelperInterface* helper,
QuicAlarmFactory* alarm_factory,
QuicPacketWriter* writer,
bool owns_writer,
Perspective perspective,
const ParsedQuicVersionVector& supported_versions)
: framer_(supported_versions,
helper->GetClock()->ApproximateNow(),
perspective,
server_connection_id.length()),
current_packet_content_(NO_FRAMES_RECEIVED),
is_current_packet_connectivity_probing_(false),
has_path_challenge_in_current_packet_(false),
current_effective_peer_migration_type_(NO_CHANGE),
helper_(helper),
alarm_factory_(alarm_factory),
per_packet_options_(nullptr),
writer_(writer),
owns_writer_(owns_writer),
encryption_level_(ENCRYPTION_INITIAL),
clock_(helper->GetClock()),
random_generator_(helper->GetRandomGenerator()),
server_connection_id_(server_connection_id),
client_connection_id_(EmptyQuicConnectionId()),
client_connection_id_is_set_(false),
peer_address_(initial_peer_address),
direct_peer_address_(initial_peer_address),
active_effective_peer_migration_type_(NO_CHANGE),
last_packet_decrypted_(false),
last_size_(0),
current_packet_data_(nullptr),
last_decrypted_packet_level_(ENCRYPTION_INITIAL),
should_last_packet_instigate_acks_(false),
max_undecryptable_packets_(0),
max_tracked_packets_(GetQuicFlag(FLAGS_quic_max_tracked_packet_count)),
idle_timeout_connection_close_behavior_(
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET),
num_rtos_for_blackhole_detection_(0),
uber_received_packet_manager_(&stats_),
stop_waiting_count_(0),
pending_retransmission_alarm_(false),
defer_send_in_response_to_packets_(false),
ping_timeout_(QuicTime::Delta::FromSeconds(kPingTimeoutSecs)),
initial_retransmittable_on_wire_timeout_(QuicTime::Delta::Infinite()),
consecutive_retransmittable_on_wire_ping_count_(0),
arena_(),
ack_alarm_(alarm_factory_->CreateAlarm(arena_.New<AckAlarmDelegate>(this),
&arena_)),
retransmission_alarm_(alarm_factory_->CreateAlarm(
arena_.New<RetransmissionAlarmDelegate>(this),
&arena_)),
send_alarm_(
alarm_factory_->CreateAlarm(arena_.New<SendAlarmDelegate>(this),
&arena_)),
ping_alarm_(
alarm_factory_->CreateAlarm(arena_.New<PingAlarmDelegate>(this),
&arena_)),
mtu_discovery_alarm_(alarm_factory_->CreateAlarm(
arena_.New<MtuDiscoveryAlarmDelegate>(this),
&arena_)),
process_undecryptable_packets_alarm_(alarm_factory_->CreateAlarm(
arena_.New<ProcessUndecryptablePacketsAlarmDelegate>(this),
&arena_)),
visitor_(nullptr),
debug_visitor_(nullptr),
packet_creator_(server_connection_id_, &framer_, random_generator_, this),
time_of_last_received_packet_(clock_->ApproximateNow()),
sent_packet_manager_(perspective,
clock_,
random_generator_,
&stats_,
GetDefaultCongestionControlType()),
version_negotiated_(false),
perspective_(perspective),
connected_(true),
can_truncate_connection_ids_(perspective == Perspective::IS_SERVER),
mtu_probe_count_(0),
previous_validated_mtu_(0),
peer_max_packet_size_(kDefaultMaxPacketSizeTransportParam),
largest_received_packet_size_(0),
write_error_occurred_(false),
no_stop_waiting_frames_(
VersionHasIetfInvariantHeader(transport_version())),
consecutive_num_packets_with_no_retransmittable_frames_(0),
max_consecutive_num_packets_with_no_retransmittable_frames_(
kMaxConsecutiveNonRetransmittablePackets),
bundle_retransmittable_with_pto_ack_(false),
fill_up_link_during_probing_(false),
probing_retransmission_pending_(false),
stateless_reset_token_received_(false),
received_stateless_reset_token_(0),
last_control_frame_id_(kInvalidControlFrameId),
is_path_degrading_(false),
processing_ack_frame_(false),
supports_release_time_(false),
release_time_into_future_(QuicTime::Delta::Zero()),
drop_incoming_retry_packets_(false),
bytes_received_before_address_validation_(0),
bytes_sent_before_address_validation_(0),
address_validated_(false),
blackhole_detector_(this, &arena_, alarm_factory_),
idle_network_detector_(this,
clock_->ApproximateNow(),
&arena_,
alarm_factory_),
support_handshake_done_(version().HasHandshakeDone()) {
QUIC_BUG_IF(!start_peer_migration_earlier_ && send_path_response_);
if (fix_missing_connected_checks_) {
QUIC_RELOADABLE_FLAG_COUNT(quic_add_missing_connected_checks);
}
QUIC_DLOG(INFO) << ENDPOINT << "Created connection with server connection ID "
<< server_connection_id
<< " and version: " << ParsedQuicVersionToString(version());
QUIC_BUG_IF(!QuicUtils::IsConnectionIdValidForVersion(server_connection_id,
transport_version()))
<< "QuicConnection: attempted to use server connection ID "
<< server_connection_id << " which is invalid with version "
<< QuicVersionToString(transport_version());
framer_.set_visitor(this);
stats_.connection_creation_time = clock_->ApproximateNow();
// TODO(ianswett): Supply the NetworkChangeVisitor as a constructor argument
// and make it required non-null, because it's always used.
sent_packet_manager_.SetNetworkChangeVisitor(this);
if (GetQuicRestartFlag(quic_offload_pacing_to_usps2)) {
sent_packet_manager_.SetPacingAlarmGranularity(QuicTime::Delta::Zero());
release_time_into_future_ =
QuicTime::Delta::FromMilliseconds(kMinReleaseTimeIntoFutureMs);
}
// Allow the packet writer to potentially reduce the packet size to a value
// even smaller than kDefaultMaxPacketSize.
SetMaxPacketLength(perspective_ == Perspective::IS_SERVER
? kDefaultServerMaxPacketSize
: kDefaultMaxPacketSize);
uber_received_packet_manager_.set_max_ack_ranges(255);
MaybeEnableMultiplePacketNumberSpacesSupport();
DCHECK(perspective_ == Perspective::IS_CLIENT ||
supported_versions.size() == 1);
InstallInitialCrypters(server_connection_id_);
// On the server side, version negotiation has been done by the dispatcher,
// and the server connection is created with the right version.
if (perspective_ == Perspective::IS_SERVER) {
SetVersionNegotiated();
}
if (default_enable_5rto_blackhole_detection_) {
num_rtos_for_blackhole_detection_ = 5;
if (GetQuicReloadableFlag(quic_disable_server_blackhole_detection) &&
perspective_ == Perspective::IS_SERVER) {
QUIC_RELOADABLE_FLAG_COUNT(quic_disable_server_blackhole_detection);
blackhole_detection_disabled_ = true;
}
}
packet_creator_.SetDefaultPeerAddress(initial_peer_address);
}
void QuicConnection::InstallInitialCrypters(QuicConnectionId connection_id) {
CrypterPair crypters;
CryptoUtils::CreateInitialObfuscators(perspective_, version(), connection_id,
&crypters);
SetEncrypter(ENCRYPTION_INITIAL, std::move(crypters.encrypter));
if (version().KnowsWhichDecrypterToUse()) {
InstallDecrypter(ENCRYPTION_INITIAL, std::move(crypters.decrypter));
} else {
SetDecrypter(ENCRYPTION_INITIAL, std::move(crypters.decrypter));
}
}
QuicConnection::~QuicConnection() {
if (owns_writer_) {
delete writer_;
}
ClearQueuedPackets();
}
void QuicConnection::ClearQueuedPackets() {
buffered_packets_.clear();
}
bool QuicConnection::ValidateConfigConnectionIdsOld(const QuicConfig& config) {
// This function validates connection IDs as defined in IETF draft-27 and
// earlier.
DCHECK(config.negotiated());
DCHECK(!version().AuthenticatesHandshakeConnectionIds());
if (original_destination_connection_id_.has_value() &&
retry_source_connection_id_.has_value()) {
DCHECK_EQ(perspective_, Perspective::IS_CLIENT);
// We received a RETRY packet, validate that the original destination
// connection ID from the config matches the one from the RETRY.
if (!config.HasReceivedOriginalConnectionId() ||
config.ReceivedOriginalConnectionId() !=
original_destination_connection_id_.value()) {
std::string received_value;
if (config.HasReceivedOriginalConnectionId()) {
received_value = config.ReceivedOriginalConnectionId().ToString();
} else {
received_value = "none";
}
std::string error_details = quiche::QuicheStrCat(
"Bad original_connection_id: expected ",
original_destination_connection_id_.value().ToString(), ", received ",
received_value, ", RETRY used ", server_connection_id_.ToString());
CloseConnection(IETF_QUIC_PROTOCOL_VIOLATION, error_details,
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
return false;
}
} else {
// We did not receive a RETRY packet, make sure we did not receive the
// original_destination_connection_id transport parameter.
if (config.HasReceivedOriginalConnectionId()) {
std::string error_details = quiche::QuicheStrCat(
"Bad original_connection_id: did not receive RETRY but received ",
config.ReceivedOriginalConnectionId().ToString());
CloseConnection(IETF_QUIC_PROTOCOL_VIOLATION, error_details,
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
return false;
}
}
return true;
}
bool QuicConnection::ValidateConfigConnectionIds(const QuicConfig& config) {
DCHECK(config.negotiated());
if (!version().UsesTls()) {
// QUIC+TLS is required to transmit connection ID transport parameters.
return true;
}
if (!version().AuthenticatesHandshakeConnectionIds()) {
return ValidateConfigConnectionIdsOld(config);
}
// This function validates connection IDs as defined in IETF draft-28 and
// later.
// Validate initial_source_connection_id.
QuicConnectionId expected_initial_source_connection_id;
if (perspective_ == Perspective::IS_CLIENT) {
expected_initial_source_connection_id = server_connection_id_;
} else {
expected_initial_source_connection_id = client_connection_id_;
}
if (!config.HasReceivedInitialSourceConnectionId() ||
config.ReceivedInitialSourceConnectionId() !=
expected_initial_source_connection_id) {
std::string received_value;
if (config.HasReceivedInitialSourceConnectionId()) {
received_value = config.ReceivedInitialSourceConnectionId().ToString();
} else {
received_value = "none";
}
std::string error_details =
quiche::QuicheStrCat("Bad initial_source_connection_id: expected ",
expected_initial_source_connection_id.ToString(),
", received ", received_value);
CloseConnection(IETF_QUIC_PROTOCOL_VIOLATION, error_details,
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
return false;
}
if (perspective_ == Perspective::IS_CLIENT) {
// Validate original_destination_connection_id.
if (!config.HasReceivedOriginalConnectionId() ||
config.ReceivedOriginalConnectionId() !=
GetOriginalDestinationConnectionId()) {
std::string received_value;
if (config.HasReceivedOriginalConnectionId()) {
received_value = config.ReceivedOriginalConnectionId().ToString();
} else {
received_value = "none";
}
std::string error_details = quiche::QuicheStrCat(
"Bad original_destination_connection_id: expected ",
GetOriginalDestinationConnectionId().ToString(), ", received ",
received_value);
CloseConnection(IETF_QUIC_PROTOCOL_VIOLATION, error_details,
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
return false;
}
// Validate retry_source_connection_id.
if (retry_source_connection_id_.has_value()) {
// We received a RETRY packet, validate that the retry source
// connection ID from the config matches the one from the RETRY.
if (!config.HasReceivedRetrySourceConnectionId() ||
config.ReceivedRetrySourceConnectionId() !=
retry_source_connection_id_.value()) {
std::string received_value;
if (config.HasReceivedRetrySourceConnectionId()) {
received_value = config.ReceivedRetrySourceConnectionId().ToString();
} else {
received_value = "none";
}
std::string error_details =
quiche::QuicheStrCat("Bad retry_source_connection_id: expected ",
retry_source_connection_id_.value().ToString(),
", received ", received_value);
CloseConnection(IETF_QUIC_PROTOCOL_VIOLATION, error_details,
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
return false;
}
} else {
// We did not receive a RETRY packet, make sure we did not receive the
// retry_source_connection_id transport parameter.
if (config.HasReceivedRetrySourceConnectionId()) {
std::string error_details = quiche::QuicheStrCat(
"Bad retry_source_connection_id: did not receive RETRY but "
"received ",
config.ReceivedRetrySourceConnectionId().ToString());
CloseConnection(IETF_QUIC_PROTOCOL_VIOLATION, error_details,
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
return false;
}
}
}
return true;
}
void QuicConnection::SetFromConfig(const QuicConfig& config) {
if (config.negotiated()) {
// Handshake complete, set handshake timeout to Infinite.
SetNetworkTimeouts(QuicTime::Delta::Infinite(),
config.IdleNetworkTimeout());
idle_timeout_connection_close_behavior_ =
ConnectionCloseBehavior::SILENT_CLOSE;
if (GetQuicReloadableFlag(quic_add_silent_idle_timeout) &&
perspective_ == Perspective::IS_SERVER) {
idle_timeout_connection_close_behavior_ = ConnectionCloseBehavior::
SILENT_CLOSE_WITH_CONNECTION_CLOSE_PACKET_SERIALIZED;
}
if (GetQuicReloadableFlag(quic_no_silent_close_for_idle_timeout) &&
config.HasClientRequestedIndependentOption(kNSLC, perspective_)) {
QUIC_RELOADABLE_FLAG_COUNT(quic_no_silent_close_for_idle_timeout);
idle_timeout_connection_close_behavior_ =
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET;
}
if (!ValidateConfigConnectionIds(config)) {
return;
}
} else {
SetNetworkTimeouts(config.max_time_before_crypto_handshake(),
config.max_idle_time_before_crypto_handshake());
}
if (config.HandshakeDoneSupported()) {
support_handshake_done_ = true;
}
sent_packet_manager_.SetFromConfig(config);
if (config.HasReceivedBytesForConnectionId() &&
can_truncate_connection_ids_) {
packet_creator_.SetServerConnectionIdLength(
config.ReceivedBytesForConnectionId());
}
max_undecryptable_packets_ = config.max_undecryptable_packets();
if (!GetQuicReloadableFlag(quic_enable_mtu_discovery_at_server)) {
if (config.HasClientRequestedIndependentOption(kMTUH, perspective_)) {
SetMtuDiscoveryTarget(kMtuDiscoveryTargetPacketSizeHigh);
}
}
if (config.HasClientRequestedIndependentOption(kMTUL, perspective_)) {
SetMtuDiscoveryTarget(kMtuDiscoveryTargetPacketSizeLow);
}
if (default_enable_5rto_blackhole_detection_) {
if (config.HasClientRequestedIndependentOption(kCBHD, perspective_)) {
QUIC_CODE_COUNT(quic_client_only_blackhole_detection);
blackhole_detection_disabled_ = true;
}
if (config.HasClientSentConnectionOption(kNBHD, perspective_)) {
blackhole_detection_disabled_ = true;
}
if (config.HasClientSentConnectionOption(k2RTO, perspective_)) {
QUIC_CODE_COUNT(quic_2rto_blackhole_detection);
num_rtos_for_blackhole_detection_ = 2;
}
if (config.HasClientSentConnectionOption(k3RTO, perspective_)) {
QUIC_CODE_COUNT(quic_3rto_blackhole_detection);
num_rtos_for_blackhole_detection_ = 3;
}
if (config.HasClientSentConnectionOption(k4RTO, perspective_)) {
QUIC_CODE_COUNT(quic_4rto_blackhole_detection);
num_rtos_for_blackhole_detection_ = 4;
}
if (config.HasClientSentConnectionOption(k6RTO, perspective_)) {
QUIC_CODE_COUNT(quic_6rto_blackhole_detection);
num_rtos_for_blackhole_detection_ = 6;
}
}
if (config.HasClientRequestedIndependentOption(kFIDT, perspective_)) {
idle_network_detector_.enable_shorter_idle_timeout_on_sent_packet();
}
if (config.HasClientRequestedIndependentOption(k3AFF, perspective_)) {
anti_amplification_factor_ = 3;
}
if (config.HasClientRequestedIndependentOption(k10AF, perspective_)) {
anti_amplification_factor_ = 10;
}
if (debug_visitor_ != nullptr) {
debug_visitor_->OnSetFromConfig(config);
}
uber_received_packet_manager_.SetFromConfig(config, perspective_);
if (config.HasClientSentConnectionOption(k5RTO, perspective_)) {
num_rtos_for_blackhole_detection_ = 5;
}
if (sent_packet_manager_.pto_enabled()) {
if (config.HasClientSentConnectionOption(k6PTO, perspective_) ||
config.HasClientSentConnectionOption(k7PTO, perspective_) ||
config.HasClientSentConnectionOption(k8PTO, perspective_)) {
num_rtos_for_blackhole_detection_ = 5;
}
}
if (config.HasClientSentConnectionOption(kNSTP, perspective_)) {
no_stop_waiting_frames_ = true;
}
if (config.HasReceivedStatelessResetToken()) {
stateless_reset_token_received_ = true;
received_stateless_reset_token_ = config.ReceivedStatelessResetToken();
}
if (config.HasReceivedAckDelayExponent()) {
framer_.set_peer_ack_delay_exponent(config.ReceivedAckDelayExponent());
}
if (GetQuicReloadableFlag(quic_send_timestamps) &&
config.HasClientSentConnectionOption(kSTMP, perspective_)) {
QUIC_RELOADABLE_FLAG_COUNT(quic_send_timestamps);
framer_.set_process_timestamps(true);
uber_received_packet_manager_.set_save_timestamps(true);
}
if (config.HasClientSentConnectionOption(kEACK, perspective_)) {
bundle_retransmittable_with_pto_ack_ = true;
}
if (config.HasReceivedMaxPacketSize()) {
peer_max_packet_size_ = config.ReceivedMaxPacketSize();
MaybeUpdatePacketCreatorMaxPacketLengthAndPadding();
}
if (config.HasReceivedMaxDatagramFrameSize()) {
packet_creator_.SetMaxDatagramFrameSize(
config.ReceivedMaxDatagramFrameSize());
}
supports_release_time_ =
writer_ != nullptr && writer_->SupportsReleaseTime() &&
!config.HasClientSentConnectionOption(kNPCO, perspective_);
if (supports_release_time_) {
UpdateReleaseTimeIntoFuture();
}
}
void QuicConnection::EnableLegacyVersionEncapsulation(
const std::string& server_name) {
if (perspective_ != Perspective::IS_CLIENT) {
QUIC_BUG << "Cannot enable Legacy Version Encapsulation on the server";
return;
}
if (legacy_version_encapsulation_enabled_) {
QUIC_BUG << "Do not call EnableLegacyVersionEncapsulation twice";
return;
}
if (!QuicHostnameUtils::IsValidSNI(server_name)) {
// Legacy Version Encapsulation is only used when SNI is transmitted.
QUIC_DLOG(INFO)
<< "Refusing to use Legacy Version Encapsulation with invalid SNI \""
<< server_name << "\"";
return;
}
QUIC_DLOG(INFO) << "Enabling Legacy Version Encapsulation with SNI \""
<< server_name << "\"";
legacy_version_encapsulation_enabled_ = true;
legacy_version_encapsulation_sni_ = server_name;
}
bool QuicConnection::MaybeTestLiveness() {
if (encryption_level_ != ENCRYPTION_FORWARD_SECURE) {
return false;
}
const QuicTime idle_network_deadline =
idle_network_detector_.GetIdleNetworkDeadline();
if (!idle_network_deadline.IsInitialized()) {
return false;
}
const QuicTime now = clock_->ApproximateNow();
if (now > idle_network_deadline) {
QUIC_BUG << "Idle network deadline has passed";
return false;
}
const QuicTime::Delta timeout = idle_network_deadline - now;
if (2 * timeout > idle_network_detector_.idle_network_timeout()) {
// Do not test liveness if timeout is > half timeout. This is used to
// prevent an infinite loop for short idle timeout.
return false;
}
if (!sent_packet_manager_.IsLessThanThreePTOs(timeout)) {
return false;
}
SendConnectivityProbingPacket(writer_, peer_address_);
return true;
}
void QuicConnection::ApplyConnectionOptions(
const QuicTagVector& connection_options) {
sent_packet_manager_.ApplyConnectionOptions(connection_options);
}
void QuicConnection::OnSendConnectionState(
const CachedNetworkParameters& cached_network_params) {
if (debug_visitor_ != nullptr) {
debug_visitor_->OnSendConnectionState(cached_network_params);
}
}
void QuicConnection::OnReceiveConnectionState(
const CachedNetworkParameters& cached_network_params) {
if (debug_visitor_ != nullptr) {
debug_visitor_->OnReceiveConnectionState(cached_network_params);
}
}
void QuicConnection::ResumeConnectionState(
const CachedNetworkParameters& cached_network_params,
bool max_bandwidth_resumption) {
sent_packet_manager_.ResumeConnectionState(cached_network_params,
max_bandwidth_resumption);
}
void QuicConnection::SetMaxPacingRate(QuicBandwidth max_pacing_rate) {
sent_packet_manager_.SetMaxPacingRate(max_pacing_rate);
}
void QuicConnection::AdjustNetworkParameters(
const SendAlgorithmInterface::NetworkParams& params) {
sent_packet_manager_.AdjustNetworkParameters(params);
}
void QuicConnection::SetLossDetectionTuner(
std::unique_ptr<LossDetectionTunerInterface> tuner) {
sent_packet_manager_.SetLossDetectionTuner(std::move(tuner));
}
void QuicConnection::OnConfigNegotiated() {
sent_packet_manager_.OnConfigNegotiated();
if (GetQuicReloadableFlag(quic_enable_mtu_discovery_at_server) &&
perspective_ == Perspective::IS_SERVER) {
QUIC_RELOADABLE_FLAG_COUNT(quic_enable_mtu_discovery_at_server);
SetMtuDiscoveryTarget(kMtuDiscoveryTargetPacketSizeHigh);
}
}
QuicBandwidth QuicConnection::MaxPacingRate() const {
return sent_packet_manager_.MaxPacingRate();
}
bool QuicConnection::SelectMutualVersion(
const ParsedQuicVersionVector& 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 ParsedQuicVersionVector& supported_versions =
framer_.supported_versions();
for (size_t i = 0; i < supported_versions.size(); ++i) {
const ParsedQuicVersion& version = supported_versions[i];
if (QuicContainsValue(available_versions, version)) {
framer_.set_version(version);
return true;
}
}
return false;
}
void QuicConnection::OnError(QuicFramer* framer) {
// Packets that we can not or have not decrypted are dropped.
// TODO(rch): add stats to measure this.
if (!connected_ || last_packet_decrypted_ == false) {
return;
}
CloseConnection(framer->error(), framer->detailed_error(),
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
}
void QuicConnection::OnPacket() {
last_packet_decrypted_ = false;
}
void QuicConnection::OnPublicResetPacket(const QuicPublicResetPacket& packet) {
// Check that any public reset packet with a different connection ID that was
// routed to this QuicConnection has been redirected before control reaches
// here. (Check for a bug regression.)
DCHECK_EQ(server_connection_id_, packet.connection_id);
DCHECK_EQ(perspective_, Perspective::IS_CLIENT);
DCHECK(!VersionHasIetfInvariantHeader(transport_version()));
if (debug_visitor_ != nullptr) {
debug_visitor_->OnPublicResetPacket(packet);
}
std::string error_details = "Received public reset.";
if (perspective_ == Perspective::IS_CLIENT && !packet.endpoint_id.empty()) {
QuicStrAppend(&error_details, " From ", packet.endpoint_id, ".");
}
QUIC_DLOG(INFO) << ENDPOINT << error_details;
QUIC_CODE_COUNT(quic_tear_down_local_connection_on_public_reset);
TearDownLocalConnectionState(QUIC_PUBLIC_RESET, error_details,
ConnectionCloseSource::FROM_PEER);
}
bool QuicConnection::OnProtocolVersionMismatch(
ParsedQuicVersion received_version) {
QUIC_DLOG(INFO) << ENDPOINT << "Received packet with mismatched version "
<< ParsedQuicVersionToString(received_version);
if (perspective_ == Perspective::IS_CLIENT) {
const std::string error_details = "Protocol version mismatch.";
QUIC_BUG << ENDPOINT << error_details;
CloseConnection(QUIC_INTERNAL_ERROR, error_details,
ConnectionCloseBehavior::SILENT_CLOSE);
}
// Server drops old packets that were sent by the client before the version
// was negotiated.
return false;
}
// Handles version negotiation for client connection.
void QuicConnection::OnVersionNegotiationPacket(
const QuicVersionNegotiationPacket& packet) {
// Check that any public reset packet with a different connection ID that was
// routed to this QuicConnection has been redirected before control reaches
// here. (Check for a bug regression.)
DCHECK_EQ(server_connection_id_, packet.connection_id);
if (perspective_ == Perspective::IS_SERVER) {
const std::string error_details =
"Server received version negotiation packet.";
QUIC_BUG << error_details;
QUIC_CODE_COUNT(quic_tear_down_local_connection_on_version_negotiation);
CloseConnection(QUIC_INTERNAL_ERROR, error_details,
ConnectionCloseBehavior::SILENT_CLOSE);
return;
}
if (debug_visitor_ != nullptr) {
debug_visitor_->OnVersionNegotiationPacket(packet);
}
if (version_negotiated_) {
// Possibly a duplicate version negotiation packet.
return;
}
if (QuicContainsValue(packet.versions, version())) {
const std::string error_details = quiche::QuicheStrCat(
"Server already supports client's version ",
ParsedQuicVersionToString(version()),
" and should have accepted the connection instead of sending {",
ParsedQuicVersionVectorToString(packet.versions), "}.");
QUIC_DLOG(WARNING) << error_details;
CloseConnection(QUIC_INVALID_VERSION_NEGOTIATION_PACKET, error_details,
ConnectionCloseBehavior::SILENT_CLOSE);
return;
}
server_supported_versions_ = packet.versions;
CloseConnection(
QUIC_INVALID_VERSION,
quiche::QuicheStrCat(
"Client may support one of the versions in the server's list, but "
"it's going to close the connection anyway. Supported versions: {",
ParsedQuicVersionVectorToString(framer_.supported_versions()),
"}, peer supported versions: {",
ParsedQuicVersionVectorToString(packet.versions), "}"),
ConnectionCloseBehavior::SILENT_CLOSE);
}
// Handles retry for client connection.
void QuicConnection::OnRetryPacket(
QuicConnectionId original_connection_id,
QuicConnectionId new_connection_id,
quiche::QuicheStringPiece retry_token,
quiche::QuicheStringPiece retry_integrity_tag,
quiche::QuicheStringPiece retry_without_tag) {
DCHECK_EQ(Perspective::IS_CLIENT, perspective_);
if (version().HasRetryIntegrityTag()) {
if (!CryptoUtils::ValidateRetryIntegrityTag(
version(), server_connection_id_, retry_without_tag,
retry_integrity_tag)) {
QUIC_DLOG(ERROR) << "Ignoring RETRY with invalid integrity tag";
return;
}
} else {
if (original_connection_id != server_connection_id_) {
QUIC_DLOG(ERROR) << "Ignoring RETRY with original connection ID "
<< original_connection_id << " not matching expected "
<< server_connection_id_ << " token "
<< quiche::QuicheTextUtils::HexEncode(retry_token);
return;
}
}
if (drop_incoming_retry_packets_) {
QUIC_DLOG(ERROR) << "Ignoring RETRY with token "
<< quiche::QuicheTextUtils::HexEncode(retry_token);
return;
}
drop_incoming_retry_packets_ = true;
stats_.retry_packet_processed = true;
QUIC_DLOG(INFO) << "Received RETRY, replacing connection ID "
<< server_connection_id_ << " with " << new_connection_id
<< ", received token "
<< quiche::QuicheTextUtils::HexEncode(retry_token);
if (!original_destination_connection_id_.has_value()) {
original_destination_connection_id_ = server_connection_id_;
}
DCHECK(!retry_source_connection_id_.has_value())
<< retry_source_connection_id_.value();
retry_source_connection_id_ = new_connection_id;
server_connection_id_ = new_connection_id;
packet_creator_.SetServerConnectionId(server_connection_id_);
packet_creator_.SetRetryToken(retry_token);
// Reinstall initial crypters because the connection ID changed.
InstallInitialCrypters(server_connection_id_);
}
bool QuicConnection::HasIncomingConnectionId(QuicConnectionId connection_id) {
for (QuicConnectionId const& incoming_connection_id :
incoming_connection_ids_) {
if (incoming_connection_id == connection_id) {
return true;
}
}
return false;
}
void QuicConnection::SetOriginalDestinationConnectionId(
const QuicConnectionId& original_destination_connection_id) {
QUIC_DLOG(INFO) << "Setting original_destination_connection_id to "
<< original_destination_connection_id
<< " on connection with server_connection_id "
<< server_connection_id_;
DCHECK_NE(original_destination_connection_id, server_connection_id_);
if (!HasIncomingConnectionId(original_destination_connection_id)) {
incoming_connection_ids_.push_back(original_destination_connection_id);
}
InstallInitialCrypters(original_destination_connection_id);
DCHECK(!original_destination_connection_id_.has_value())
<< original_destination_connection_id_.value();
original_destination_connection_id_ = original_destination_connection_id;
}
QuicConnectionId QuicConnection::GetOriginalDestinationConnectionId() {
if (original_destination_connection_id_.has_value()) {
return original_destination_connection_id_.value();
}
return server_connection_id_;
}
bool QuicConnection::OnUnauthenticatedPublicHeader(
const QuicPacketHeader& header) {
// As soon as we receive an initial we start ignoring subsequent retries.
if (header.version_flag && header.long_packet_type == INITIAL) {
drop_incoming_retry_packets_ = true;
}
QuicConnectionId server_connection_id =
GetServerConnectionIdAsRecipient(header, perspective_);
if (server_connection_id != server_connection_id_ &&
!HasIncomingConnectionId(server_connection_id)) {
if (PacketCanReplaceConnectionId(header, perspective_)) {
QUIC_DLOG(INFO) << ENDPOINT << "Accepting packet with new connection ID "
<< server_connection_id << " instead of "
<< server_connection_id_;
return true;
}
++stats_.packets_dropped;
QUIC_DLOG(INFO) << ENDPOINT
<< "Ignoring packet from unexpected server connection ID "
<< server_connection_id << " instead of "
<< server_connection_id_;
if (debug_visitor_ != nullptr) {
debug_visitor_->OnIncorrectConnectionId(server_connection_id);
}
// If this is a server, the dispatcher routes each packet to the
// QuicConnection responsible for the packet's connection ID. So if control
// arrives here and this is a server, the dispatcher must be malfunctioning.
DCHECK_NE(Perspective::IS_SERVER, perspective_);
return false;
}
if (!version().SupportsClientConnectionIds()) {
return true;
}
QuicConnectionId client_connection_id =
GetClientConnectionIdAsRecipient(header, perspective_);
if (client_connection_id == client_connection_id_) {
return true;
}
if (!client_connection_id_is_set_ && perspective_ == Perspective::IS_SERVER) {
QUIC_DLOG(INFO) << ENDPOINT
<< "Setting client connection ID from first packet to "
<< client_connection_id;
set_client_connection_id(client_connection_id);
return true;
}
++stats_.packets_dropped;
QUIC_DLOG(INFO) << ENDPOINT
<< "Ignoring packet from unexpected client connection ID "
<< client_connection_id << " instead of "
<< client_connection_id_;
return false;
}
bool QuicConnection::OnUnauthenticatedHeader(const QuicPacketHeader& header) {
if (debug_visitor_ != nullptr) {
debug_visitor_->OnUnauthenticatedHeader(header);
}
// Check that any public reset packet with a different connection ID that was
// routed to this QuicConnection has been redirected before control reaches
// here.
DCHECK(GetServerConnectionIdAsRecipient(header, perspective_) ==
server_connection_id_ ||
HasIncomingConnectionId(
GetServerConnectionIdAsRecipient(header, perspective_)) ||
PacketCanReplaceConnectionId(header, perspective_));
if (packet_creator_.HasPendingFrames()) {
// Incoming packets may change a queued ACK frame.
const std::string error_details =
"Pending frames must be serialized before incoming packets are "
"processed.";
QUIC_BUG << error_details << ", received header: " << header;
CloseConnection(QUIC_INTERNAL_ERROR, error_details,
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
return false;
}
return true;
}
void QuicConnection::OnSuccessfulVersionNegotiation() {
visitor_->OnSuccessfulVersionNegotiation(version());
if (debug_visitor_ != nullptr) {
debug_visitor_->OnSuccessfulVersionNegotiation(version());
}
}
void QuicConnection::OnSuccessfulMigrationAfterProbing() {
DCHECK_EQ(perspective_, Perspective::IS_CLIENT);
if (IsPathDegrading()) {
// If path was previously degrading, and migration is successful after
// probing, restart the path degrading and blackhole detection.
OnForwardProgressMade();
}
// TODO(b/159074035): notify SentPacketManger with RTT sample from probing and
// reset cwnd if this is a successful network migration.
}
void QuicConnection::OnTransportParametersSent(
const TransportParameters& transport_parameters) const {
if (debug_visitor_ != nullptr) {
debug_visitor_->OnTransportParametersSent(transport_parameters);
}
}
void QuicConnection::OnTransportParametersReceived(
const TransportParameters& transport_parameters) const {
if (debug_visitor_ != nullptr) {
debug_visitor_->OnTransportParametersReceived(transport_parameters);
}
}
void QuicConnection::OnTransportParametersResumed(
const TransportParameters& transport_parameters) const {
if (debug_visitor_ != nullptr) {
debug_visitor_->OnTransportParametersResumed(transport_parameters);
}
}
bool QuicConnection::HasPendingAcks() const {
return ack_alarm_->IsSet();
}
void QuicConnection::OnDecryptedPacket(EncryptionLevel level) {
last_decrypted_packet_level_ = level;
last_packet_decrypted_ = true;
if (EnforceAntiAmplificationLimit() &&
last_decrypted_packet_level_ >= ENCRYPTION_HANDSHAKE) {
// Address is validated by successfully processing a HANDSHAKE packet.
address_validated_ = true;
}
idle_network_detector_.OnPacketReceived(time_of_last_received_packet_);
visitor_->OnPacketDecrypted(level);
}
QuicSocketAddress QuicConnection::GetEffectivePeerAddressFromCurrentPacket()
const {
// By default, the connection is not proxied, and the effective peer address
// is the packet's source address, i.e. the direct peer address.
return last_packet_source_address_;
}
bool QuicConnection::OnPacketHeader(const QuicPacketHeader& header) {
if (debug_visitor_ != nullptr) {
debug_visitor_->OnPacketHeader(header);
}
// Will be decremented below if we fall through to return true.
++stats_.packets_dropped;
if (!ProcessValidatedPacket(header)) {
return false;
}
// Initialize the current packet content state.
current_packet_content_ = NO_FRAMES_RECEIVED;
is_current_packet_connectivity_probing_ = false;
has_path_challenge_in_current_packet_ = false;
current_effective_peer_migration_type_ = NO_CHANGE;
if (perspective_ == Perspective::IS_CLIENT) {
if (!GetLargestReceivedPacket().IsInitialized() ||
header.packet_number > GetLargestReceivedPacket()) {
// Update peer_address_ and effective_peer_address_ immediately for
// client connections.
// TODO(fayang): only change peer addresses in application data packet
// number space.
UpdatePeerAddress(last_packet_source_address_);
effective_peer_address_ = GetEffectivePeerAddressFromCurrentPacket();
}
} else {
// At server, remember the address change type of effective_peer_address
// in current_effective_peer_migration_type_. But this variable alone
// doesn't necessarily starts a migration. A migration will be started
// later, once the current packet is confirmed to meet the following
// conditions:
// 1) current_effective_peer_migration_type_ is not NO_CHANGE.
// 2) The current packet is not a connectivity probing.
// 3) The current packet is not reordered, i.e. its packet number is the
// largest of this connection so far.
// Once the above conditions are confirmed, a new migration will start
// even if there is an active migration underway.
current_effective_peer_migration_type_ =
QuicUtils::DetermineAddressChangeType(
effective_peer_address_,
GetEffectivePeerAddressFromCurrentPacket());
QUIC_DLOG_IF(INFO, current_effective_peer_migration_type_ != NO_CHANGE)
<< ENDPOINT << "Effective peer's ip:port changed from "
<< effective_peer_address_.ToString() << " to "
<< GetEffectivePeerAddressFromCurrentPacket().ToString()
<< ", active_effective_peer_migration_type is "
<< active_effective_peer_migration_type_;
}
--stats_.packets_dropped;
QUIC_DVLOG(1) << ENDPOINT << "Received packet header: " << header;
last_header_ = header;
if (!stats_.first_decrypted_packet.IsInitialized()) {
stats_.first_decrypted_packet = last_header_.packet_number;
}
// Record packet receipt to populate ack info before processing stream
// frames, since the processing may result in sending a bundled ack.
uber_received_packet_manager_.RecordPacketReceived(
last_decrypted_packet_level_, last_header_,
idle_network_detector_.time_of_last_received_packet());
DCHECK(connected_);
return true;
}
bool QuicConnection::OnStreamFrame(const QuicStreamFrame& frame) {
DCHECK(connected_);
// Since a stream frame was received, this is not a connectivity probe.
// A probe only contains a PING and full padding.
UpdatePacketContent(STREAM_FRAME);
if (debug_visitor_ != nullptr) {
debug_visitor_->OnStreamFrame(frame);
}
if (!QuicUtils::IsCryptoStreamId(transport_version(), frame.stream_id) &&
last_decrypted_packet_level_ == ENCRYPTION_INITIAL) {
if (MaybeConsiderAsMemoryCorruption(frame)) {
CloseConnection(QUIC_MAYBE_CORRUPTED_MEMORY,
"Received crypto frame on non crypto stream.",
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
return false;
}
QUIC_PEER_BUG << ENDPOINT
<< "Received an unencrypted data frame: closing connection"
<< " packet_number:" << last_header_.packet_number
<< " stream_id:" << frame.stream_id
<< " received_packets:" << ack_frame();
CloseConnection(QUIC_UNENCRYPTED_STREAM_DATA,
"Unencrypted stream data seen.",
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
return false;
}
MaybeUpdateAckTimeout();
visitor_->OnStreamFrame(frame);
stats_.stream_bytes_received += frame.data_length;
consecutive_retransmittable_on_wire_ping_count_ = 0;
return connected_;
}
bool QuicConnection::OnCryptoFrame(const QuicCryptoFrame& frame) {
DCHECK(connected_);
// Since a CRYPTO frame was received, this is not a connectivity probe.
// A probe only contains a PING and full padding.
UpdatePacketContent(CRYPTO_FRAME);
if (debug_visitor_ != nullptr) {
debug_visitor_->OnCryptoFrame(frame);
}
MaybeUpdateAckTimeout();
visitor_->OnCryptoFrame(frame);
return connected_;
}
bool QuicConnection::OnAckFrameStart(QuicPacketNumber largest_acked,
QuicTime::Delta ack_delay_time) {
DCHECK(connected_);
if (processing_ack_frame_) {
CloseConnection(QUIC_INVALID_ACK_DATA,
"Received a new ack while processing an ack frame.",
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
return false;
}
// Since an ack frame was received, this is not a connectivity probe.
// A probe only contains a PING and full padding.
UpdatePacketContent(ACK_FRAME);
QUIC_DVLOG(1) << ENDPOINT
<< "OnAckFrameStart, largest_acked: " << largest_acked;
if (GetLargestReceivedPacketWithAck().IsInitialized() &&
last_header_.packet_number <= GetLargestReceivedPacketWithAck()) {
QUIC_DLOG(INFO) << ENDPOINT << "Received an old ack frame: ignoring";
return true;
}
if (!sent_packet_manager_.GetLargestSentPacket().IsInitialized() ||
largest_acked > sent_packet_manager_.GetLargestSentPacket()) {
QUIC_DLOG(WARNING) << ENDPOINT
<< "Peer's observed unsent packet:" << largest_acked
<< " vs " << sent_packet_manager_.GetLargestSentPacket()
<< ". SupportsMultiplePacketNumberSpaces():"
<< SupportsMultiplePacketNumberSpaces()
<< ", last_decrypted_packet_level_:"
<< last_decrypted_packet_level_;
// We got an ack for data we have not sent.
CloseConnection(QUIC_INVALID_ACK_DATA, "Largest observed too high.",
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
return false;
}
processing_ack_frame_ = true;
sent_packet_manager_.OnAckFrameStart(
largest_acked, ack_delay_time,
idle_network_detector_.time_of_last_received_packet());
return true;
}
bool QuicConnection::OnAckRange(QuicPacketNumber start, QuicPacketNumber end) {
DCHECK(connected_);
QUIC_DVLOG(1) << ENDPOINT << "OnAckRange: [" << start << ", " << end << ")";
if (GetLargestReceivedPacketWithAck().IsInitialized() &&
last_header_.packet_number <= GetLargestReceivedPacketWithAck()) {
QUIC_DLOG(INFO) << ENDPOINT << "Received an old ack frame: ignoring";
return true;
}
sent_packet_manager_.OnAckRange(start, end);
return true;
}
bool QuicConnection::OnAckTimestamp(QuicPacketNumber packet_number,
QuicTime timestamp) {
DCHECK(connected_);
QUIC_DVLOG(1) << ENDPOINT << "OnAckTimestamp: [" << packet_number << ", "
<< timestamp.ToDebuggingValue() << ")";
if (GetLargestReceivedPacketWithAck().IsInitialized() &&
last_header_.packet_number <= GetLargestReceivedPacketWithAck()) {
QUIC_DLOG(INFO) << ENDPOINT << "Received an old ack frame: ignoring";
return true;
}
sent_packet_manager_.OnAckTimestamp(packet_number, timestamp);
return true;
}
bool QuicConnection::OnAckFrameEnd(QuicPacketNumber start) {
DCHECK(connected_);
QUIC_DVLOG(1) << ENDPOINT << "OnAckFrameEnd, start: " << start;
if (GetLargestReceivedPacketWithAck().IsInitialized() &&
last_header_.packet_number <= GetLargestReceivedPacketWithAck()) {
QUIC_DLOG(INFO) << ENDPOINT << "Received an old ack frame: ignoring";
return true;
}
const bool one_rtt_packet_was_acked =
sent_packet_manager_.one_rtt_packet_acked();
const AckResult ack_result = sent_packet_manager_.OnAckFrameEnd(
idle_network_detector_.time_of_last_received_packet(),
last_header_.packet_number, last_decrypted_packet_level_);
if (ack_result != PACKETS_NEWLY_ACKED &&
ack_result != NO_PACKETS_NEWLY_ACKED) {
// Error occurred (e.g., this ACK tries to ack packets in wrong packet
// number space), and this would cause the connection to be closed.
QUIC_DLOG(ERROR) << ENDPOINT
<< "Error occurred when processing an ACK frame: "
<< QuicUtils::AckResultToString(ack_result);
return false;
}
if (SupportsMultiplePacketNumberSpaces() && !one_rtt_packet_was_acked &&
sent_packet_manager_.one_rtt_packet_acked()) {
visitor_->OnOneRttPacketAcknowledged();
}
// Cancel the send alarm because new packets likely have been acked, which
// may change the congestion window and/or pacing rate. Canceling the alarm
// causes CanWrite to recalculate the next send time.
if (send_alarm_->IsSet()) {
send_alarm_->Cancel();
}
if (supports_release_time_) {
// Update pace time into future because smoothed RTT is likely updated.
UpdateReleaseTimeIntoFuture();
}
SetLargestReceivedPacketWithAck(last_header_.packet_number);
// If the incoming ack's packets set expresses missing packets: peer is still
// waiting for a packet lower than a packet that we are no longer planning to
// send.
// If the incoming ack's packets set expresses received packets: peer is still
// acking packets which we never care about.
// Send an ack to raise the high water mark.
const bool send_stop_waiting =
no_stop_waiting_frames_ ? false : GetLeastUnacked() > start;
PostProcessAfterAckFrame(send_stop_waiting,
ack_result == PACKETS_NEWLY_ACKED);
processing_ack_frame_ = false;
return connected_;
}
bool QuicConnection::OnStopWaitingFrame(const QuicStopWaitingFrame& frame) {
DCHECK(connected_);
// Since a stop waiting frame was received, this is not a connectivity probe.
// A probe only contains a PING and full padding.
UpdatePacketContent(STOP_WAITING_FRAME);
if (no_stop_waiting_frames_) {
return true;
}
if (largest_seen_packet_with_stop_waiting_.IsInitialized() &&
last_header_.packet_number <= largest_seen_packet_with_stop_waiting_) {
QUIC_DLOG(INFO) << ENDPOINT
<< "Received an old stop waiting frame: ignoring";
return true;
}
const char* error = ValidateStopWaitingFrame(frame);
if (error != nullptr) {
CloseConnection(QUIC_INVALID_STOP_WAITING_DATA, error,
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
return false;
}
if (debug_visitor_ != nullptr) {
debug_visitor_->OnStopWaitingFrame(frame);
}
largest_seen_packet_with_stop_waiting_ = last_header_.packet_number;
uber_received_packet_manager_.DontWaitForPacketsBefore(
last_decrypted_packet_level_, frame.least_unacked);
return connected_;
}
bool QuicConnection::OnPaddingFrame(const QuicPaddingFrame& frame) {
DCHECK(connected_);
UpdatePacketContent(PADDING_FRAME);
if (debug_visitor_ != nullptr) {
debug_visitor_->OnPaddingFrame(frame);
}
return true;
}
bool QuicConnection::OnPingFrame(const QuicPingFrame& frame) {
DCHECK(connected_);
UpdatePacketContent(PING_FRAME);
if (debug_visitor_ != nullptr) {
QuicTime::Delta ping_received_delay = QuicTime::Delta::Zero();
const QuicTime now = clock_->ApproximateNow();
if (now > stats_.connection_creation_time) {
ping_received_delay = now - stats_.connection_creation_time;
}
debug_visitor_->OnPingFrame(frame, ping_received_delay);
}
MaybeUpdateAckTimeout();
return true;
}
const char* QuicConnection::ValidateStopWaitingFrame(
const QuicStopWaitingFrame& stop_waiting) {
const QuicPacketNumber peer_least_packet_awaiting_ack =
uber_received_packet_manager_.peer_least_packet_awaiting_ack();
if (peer_least_packet_awaiting_ack.IsInitialized() &&
stop_waiting.least_unacked < peer_least_packet_awaiting_ack) {
QUIC_DLOG(ERROR) << ENDPOINT << "Peer's sent low least_unacked: "
<< stop_waiting.least_unacked << " vs "
<< peer_least_packet_awaiting_ack;
// We never process old ack frames, so this number should only increase.
return "Least unacked too small.";
}
if (stop_waiting.least_unacked > last_header_.packet_number) {
QUIC_DLOG(ERROR) << ENDPOINT
<< "Peer sent least_unacked:" << stop_waiting.least_unacked
<< " greater than the enclosing packet number:"
<< last_header_.packet_number;
return "Least unacked too large.";
}
return nullptr;
}
bool QuicConnection::OnRstStreamFrame(const QuicRstStreamFrame& frame) {
DCHECK(connected_);
// Since a reset stream frame was received, this is not a connectivity probe.
// A probe only contains a PING and full padding.
UpdatePacketContent(RST_STREAM_FRAME);
if (debug_visitor_ != nullptr) {
debug_visitor_->OnRstStreamFrame(frame);
}
QUIC_DLOG(INFO) << ENDPOINT
<< "RST_STREAM_FRAME received for stream: " << frame.stream_id
<< " with error: "
<< QuicRstStreamErrorCodeToString(frame.error_code);
MaybeUpdateAckTimeout();
visitor_->OnRstStream(frame);
return connected_;
}
bool QuicConnection::OnStopSendingFrame(const QuicStopSendingFrame& frame) {
DCHECK(connected_);
// Since a reset stream frame was received, this is not a connectivity probe.
// A probe only contains a PING and full padding.
UpdatePacketContent(STOP_SENDING_FRAME);
if (debug_visitor_ != nullptr) {
debug_visitor_->OnStopSendingFrame(frame);
}
QUIC_DLOG(INFO) << ENDPOINT << "STOP_SENDING frame received for stream: "
<< frame.stream_id
<< " with error: " << frame.ietf_error_code;
visitor_->OnStopSendingFrame(frame);
return connected_;
}
bool QuicConnection::OnPathChallengeFrame(const QuicPathChallengeFrame& frame) {
if (has_path_challenge_in_current_packet_) {
DCHECK(send_path_response_);
QUIC_RELOADABLE_FLAG_COUNT_N(quic_send_path_response, 2, 5);
// Only respond to the 1st PATH_CHALLENGE.
return true;
}
UpdatePacketContent(PATH_CHALLENGE_FRAME);
if (debug_visitor_ != nullptr) {
debug_visitor_->OnPathChallengeFrame(frame);
}
if (!send_path_response_) {
// Save the path challenge's payload, for later use in generating the
// response.
received_path_challenge_payloads_.push_back(frame.data_buffer);
MaybeUpdateAckTimeout();
return true;
}
QUIC_RELOADABLE_FLAG_COUNT_N(quic_send_path_response, 3, 5);
has_path_challenge_in_current_packet_ = true;
MaybeUpdateAckTimeout();
// Queue or send PATH_RESPONSE. No matter where the pending data are supposed
// to sent, PATH_RESPONSE should always be sent to the source address of the
// current incoming packet.
if (!SendPathResponse(frame.data_buffer, last_packet_source_address_)) {
// Queue the payloads to re-try later.
pending_path_challenge_payloads_.push_back(
{frame.data_buffer, last_packet_source_address_});
}
// TODO(b/150095588): change the stats to
// num_valid_path_challenge_received.
++stats_.num_connectivity_probing_received;
// SendPathResponse() might cause connection to be closed.
return connected_;
}
bool QuicConnection::OnPathResponseFrame(const QuicPathResponseFrame& frame) {
UpdatePacketContent(PATH_RESPONSE_FRAME);
if (debug_visitor_ != nullptr) {
debug_visitor_->OnPathResponseFrame(frame);
}
MaybeUpdateAckTimeout();
if (!transmitted_connectivity_probe_payload_ ||
*transmitted_connectivity_probe_payload_ != frame.data_buffer) {
// Is not for the probe we sent, ignore it.
return true;
}
// Have received the matching PATH RESPONSE, saved payload no longer valid.
transmitted_connectivity_probe_payload_ = nullptr;
return true;
}
bool QuicConnection::OnConnectionCloseFrame(
const QuicConnectionCloseFrame& frame) {
DCHECK(connected_);
// Since a connection close frame was received, this is not a connectivity
// probe. A probe only contains a PING and full padding.
UpdatePacketContent(CONNECTION_CLOSE_FRAME);
if (debug_visitor_ != nullptr) {
debug_visitor_->OnConnectionCloseFrame(frame);
}
switch (frame.close_type) {
case GOOGLE_QUIC_CONNECTION_CLOSE:
QUIC_DLOG(INFO) << ENDPOINT << "Received ConnectionClose for connection: "
<< connection_id() << ", with error: "
<< QuicErrorCodeToString(frame.quic_error_code) << " ("
<< frame.error_details << ")";
break;
case IETF_QUIC_TRANSPORT_CONNECTION_CLOSE:
QUIC_DLOG(INFO) << ENDPOINT
<< "Received Transport ConnectionClose for connection: "
<< connection_id() << ", with error: "
<< QuicErrorCodeToString(frame.quic_error_code) << " ("
<< frame.error_details << ")"
<< ", transport error code: " << frame.wire_error_code
<< ", error frame type: "
<< frame.transport_close_frame_type;
break;
case IETF_QUIC_APPLICATION_CONNECTION_CLOSE:
QUIC_DLOG(INFO) << ENDPOINT
<< "Received Application ConnectionClose for connection: "
<< connection_id() << ", with error: "
<< QuicErrorCodeToString(frame.quic_error_code) << " ("
<< frame.error_details << ")"
<< ", application error code: " << frame.wire_error_code;
break;
}
if (frame.quic_error_code == QUIC_BAD_MULTIPATH_FLAG) {
QUIC_LOG_FIRST_N(ERROR, 10) << "Unexpected QUIC_BAD_MULTIPATH_FLAG error."
<< " last_received_header: " << last_header_
<< " encryption_level: " << encryption_level_;
}
TearDownLocalConnectionState(frame, ConnectionCloseSource::FROM_PEER);
return connected_;
}
bool QuicConnection::OnMaxStreamsFrame(const QuicMaxStreamsFrame& frame) {
UpdatePacketContent(MAX_STREAMS_FRAME);
if (debug_visitor_ != nullptr) {
debug_visitor_->OnMaxStreamsFrame(frame);
}
return visitor_->OnMaxStreamsFrame(frame) && connected_;
}
bool QuicConnection::OnStreamsBlockedFrame(
const QuicStreamsBlockedFrame& frame) {
UpdatePacketContent(STREAMS_BLOCKED_FRAME);
if (debug_visitor_ != nullptr) {
debug_visitor_->OnStreamsBlockedFrame(frame);
}
return visitor_->OnStreamsBlockedFrame(frame) && connected_;
}
bool QuicConnection::OnGoAwayFrame(const QuicGoAwayFrame& frame) {
DCHECK(connected_);
// Since a go away frame was received, this is not a connectivity probe.
// A probe only contains a PING and full padding.
UpdatePacketContent(GOAWAY_FRAME);
if (debug_visitor_ != nullptr) {
debug_visitor_->OnGoAwayFrame(frame);
}
QUIC_DLOG(INFO) << ENDPOINT << "GOAWAY_FRAME received with last good stream: "
<< frame.last_good_stream_id
<< " and error: " << QuicErrorCodeToString(frame.error_code)
<< " and reason: " << frame.reason_phrase;
MaybeUpdateAckTimeout();
visitor_->OnGoAway(frame);
return connected_;
}
bool QuicConnection::OnWindowUpdateFrame(const QuicWindowUpdateFrame& frame) {
DCHECK(connected_);
// Since a window update frame was received, this is not a connectivity probe.
// A probe only contains a PING and full padding.
UpdatePacketContent(WINDOW_UPDATE_FRAME);
if (debug_visitor_ != nullptr) {
debug_visitor_->OnWindowUpdateFrame(
frame, idle_network_detector_.time_of_last_received_packet());
}
QUIC_DVLOG(1) << ENDPOINT << "WINDOW_UPDATE_FRAME received " << frame;
MaybeUpdateAckTimeout();
visitor_->OnWindowUpdateFrame(frame);
return connected_;
}
bool QuicConnection::OnNewConnectionIdFrame(
const QuicNewConnectionIdFrame& frame) {
UpdatePacketContent(NEW_CONNECTION_ID_FRAME);
if (debug_visitor_ != nullptr) {
debug_visitor_->OnNewConnectionIdFrame(frame);
}
return true;
}
bool QuicConnection::OnRetireConnectionIdFrame(
const QuicRetireConnectionIdFrame& frame) {
UpdatePacketContent(RETIRE_CONNECTION_ID_FRAME);
if (debug_visitor_ != nullptr) {
debug_visitor_->OnRetireConnectionIdFrame(frame);
}
return true;
}
bool QuicConnection::OnNewTokenFrame(const QuicNewTokenFrame& frame) {
UpdatePacketContent(NEW_TOKEN_FRAME);
if (debug_visitor_ != nullptr) {
debug_visitor_->OnNewTokenFrame(frame);
}
return true;
}
bool QuicConnection::OnMessageFrame(const QuicMessageFrame& frame) {
DCHECK(connected_);
// Since a message frame was received, this is not a connectivity probe.
// A probe only contains a PING and full padding.
UpdatePacketContent(MESSAGE_FRAME);
if (debug_visitor_ != nullptr) {
debug_visitor_->OnMessageFrame(frame);
}
MaybeUpdateAckTimeout();
visitor_->OnMessageReceived(
quiche::QuicheStringPiece(frame.data, frame.message_length));
return connected_;
}
bool QuicConnection::OnHandshakeDoneFrame(const QuicHandshakeDoneFrame& frame) {
DCHECK(connected_);
if (!support_handshake_done_) {
CloseConnection(IETF_QUIC_PROTOCOL_VIOLATION,
"Handshake done frame is unsupported",
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
return false;
}
if (perspective_ == Perspective::IS_SERVER) {
CloseConnection(IETF_QUIC_PROTOCOL_VIOLATION,
"Server received handshake done frame.",
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
return false;
}
// Since a handshake done frame was received, this is not a connectivity
// probe. A probe only contains a PING and full padding.
UpdatePacketContent(HANDSHAKE_DONE_FRAME);
if (debug_visitor_ != nullptr) {
debug_visitor_->OnHandshakeDoneFrame(frame);
}
MaybeUpdateAckTimeout();
visitor_->OnHandshakeDoneReceived();
return connected_;
}
bool QuicConnection::OnAckFrequencyFrame(const QuicAckFrequencyFrame& frame) {
UpdatePacketContent(ACK_FREQUENCY_FRAME);
if (!can_receive_ack_frequency_frame_) {
QUIC_LOG_EVERY_N_SEC(ERROR, 120) << "Get unexpected AckFrequencyFrame.";
return false;
}
if (auto packet_number_space =
QuicUtils::GetPacketNumberSpace(last_decrypted_packet_level_) ==
APPLICATION_DATA) {
uber_received_packet_manager_.OnAckFrequencyFrame(frame);
} else {
QUIC_LOG_EVERY_N_SEC(ERROR, 120)
<< "Get AckFrequencyFrame in packet number space "
<< packet_number_space;
}
return true;
}
bool QuicConnection::OnBlockedFrame(const QuicBlockedFrame& frame) {
DCHECK(connected_);
// Since a blocked frame was received, this is not a connectivity probe.
// A probe only contains a PING and full padding.
UpdatePacketContent(BLOCKED_FRAME);
if (debug_visitor_ != nullptr) {
debug_visitor_->OnBlockedFrame(frame);
}
QUIC_DLOG(INFO) << ENDPOINT
<< "BLOCKED_FRAME received for stream: " << frame.stream_id;
MaybeUpdateAckTimeout();
visitor_->OnBlockedFrame(frame);
stats_.blocked_frames_received++;
return connected_;
}
void QuicConnection::OnPacketComplete() {
// Don't do anything if this packet closed the connection.
if (!connected_) {
ClearLastFrames();
return;
}
if (IsCurrentPacketConnectivityProbing()) {
DCHECK(!version().HasIetfQuicFrames());
++stats_.num_connectivity_probing_received;
}
QUIC_DVLOG(1) << ENDPOINT << "Got"
<< (SupportsMultiplePacketNumberSpaces()
? (" " + EncryptionLevelToString(
last_decrypted_packet_level_))
: "")
<< " packet " << last_header_.packet_number << " for "
<< GetServerConnectionIdAsRecipient(last_header_, perspective_);
QUIC_DLOG_IF(INFO, current_packet_content_ == SECOND_FRAME_IS_PADDING)
<< ENDPOINT << "Received a padded PING packet. is_probing: "
<< IsCurrentPacketConnectivityProbing();
MaybeRespondToConnectivityProbingOrMigration();
current_effective_peer_migration_type_ = NO_CHANGE;
// For IETF QUIC, it is guaranteed that TLS will give connection the
// corresponding write key before read key. In other words, connection should
// never process a packet while an ACK for it cannot be encrypted.
if (!should_last_packet_instigate_acks_) {
uber_received_packet_manager_.MaybeUpdateAckTimeout(
should_last_packet_instigate_acks_, last_decrypted_packet_level_,
last_header_.packet_number,
clock_->ApproximateNow(), sent_packet_manager_.GetRttStats());
}
ClearLastFrames();
CloseIfTooManyOutstandingSentPackets();
}
void QuicConnection::MaybeRespondToConnectivityProbingOrMigration() {
if (version().HasIetfQuicFrames()) {
if (send_path_response_) {
return;
}
if (perspective_ == Perspective::IS_CLIENT) {
// This node is a client, notify that a speculative connectivity probing
// packet has been received anyway.
visitor_->OnPacketReceived(last_packet_destination_address_,
last_packet_source_address_,
/*is_connectivity_probe=*/false);
return;
}
if (!received_path_challenge_payloads_.empty()) {
if (current_effective_peer_migration_type_ != NO_CHANGE) {
// TODO(b/150095588): change the stats to
// num_valid_path_challenge_received.
++stats_.num_connectivity_probing_received;
}
// If the packet contains PATH CHALLENGE, send appropriate RESPONSE.
// There was at least one PATH CHALLENGE in the received packet,
// Generate the required PATH RESPONSE.
SendGenericPathProbePacket(nullptr, last_packet_source_address_,
/* is_response=*/true);
return;
}
} else {
if (IsCurrentPacketConnectivityProbing()) {
visitor_->OnPacketReceived(last_packet_destination_address_,
last_packet_source_address_,
/*is_connectivity_probe=*/true);
return;
}
if (perspective_ == Perspective::IS_CLIENT) {
// This node is a client, notify that a speculative connectivity probing
// packet has been received anyway.
QUIC_DVLOG(1) << ENDPOINT
<< "Received a speculative connectivity probing packet for "
<< GetServerConnectionIdAsRecipient(last_header_,
perspective_)
<< " from ip:port: "
<< last_packet_source_address_.ToString() << " to ip:port: "
<< last_packet_destination_address_.ToString();
visitor_->OnPacketReceived(last_packet_destination_address_,
last_packet_source_address_,
/*is_connectivity_probe=*/false);
return;
}
}
// Server starts to migrate connection upon receiving of non-probing packet
// from a new peer address.
if (!start_peer_migration_earlier_ &&
last_header_.packet_number == GetLargestReceivedPacket()) {
direct_peer_address_ = last_packet_source_address_;
if (current_effective_peer_migration_type_ != NO_CHANGE) {
// TODO(fayang): When multiple packet number spaces is supported, only
// start peer migration for the application data.
StartEffectivePeerMigration(current_effective_peer_migration_type_);
}
}
}
bool QuicConnection::IsValidStatelessResetToken(QuicUint128 token) const {
return stateless_reset_token_received_ &&
token == received_stateless_reset_token_;
}
void QuicConnection::OnAuthenticatedIetfStatelessResetPacket(
const QuicIetfStatelessResetPacket& /*packet*/) {
// TODO(fayang): Add OnAuthenticatedIetfStatelessResetPacket to
// debug_visitor_.
DCHECK(VersionHasIetfInvariantHeader(transport_version()));
DCHECK_EQ(perspective_, Perspective::IS_CLIENT);
if (!visitor_->ValidateStatelessReset(last_packet_destination_address_,
last_packet_source_address_)) {
// This packet is received on a probing path. Do not close connection.
return;
}
const std::string error_details = "Received stateless reset.";
QUIC_CODE_COUNT(quic_tear_down_local_connection_on_stateless_reset);
TearDownLocalConnectionState(QUIC_PUBLIC_RESET, error_details,
ConnectionCloseSource::FROM_PEER);
}
void QuicConnection::ClearLastFrames() {
should_last_packet_instigate_acks_ = false;
}
void QuicConnection::CloseIfTooManyOutstandingSentPackets() {
// This occurs if we don't discard old packets we've seen fast enough. It's
// possible largest observed is less than leaset unacked.
if (sent_packet_manager_.GetLargestObserved().IsInitialized() &&
sent_packet_manager_.GetLargestObserved() >
sent_packet_manager_.GetLeastUnacked() + max_tracked_packets_) {
CloseConnection(
QUIC_TOO_MANY_OUTSTANDING_SENT_PACKETS,
quiche::QuicheStrCat(
"More than ", max_tracked_packets_, " outstanding, least_unacked: ",
sent_packet_manager_.GetLeastUnacked().ToUint64(),
", packets_processed: ", stats_.packets_processed,
", last_decrypted_packet_level: ",
EncryptionLevelToString(last_decrypted_packet_level_)),
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
}
}
const QuicFrame QuicConnection::GetUpdatedAckFrame() {
DCHECK(!uber_received_packet_manager_.IsAckFrameEmpty(
QuicUtils::GetPacketNumberSpace(encryption_level_)))
<< "Try to retrieve an empty ACK frame";
return uber_received_packet_manager_.GetUpdatedAckFrame(
QuicUtils::GetPacketNumberSpace(encryption_level_),
clock_->ApproximateNow());
}
void QuicConnection::PopulateStopWaitingFrame(
QuicStopWaitingFrame* stop_waiting) {
stop_waiting->least_unacked = GetLeastUnacked();
}
QuicPacketNumber QuicConnection::GetLeastUnacked() const {
return sent_packet_manager_.GetLeastUnacked();
}
bool QuicConnection::HandleWriteBlocked() {
if (!writer_->IsWriteBlocked()) {
return false;
}
visitor_->OnWriteBlocked();
return true;
}
void QuicConnection::MaybeSendInResponseToPacket() {
if (!connected_) {
return;
}
// If the writer is blocked, don't attempt to send packets now or in the send
// alarm. When the writer unblocks, OnCanWrite() will be called for this
// connection to send.
if (HandleWriteBlocked()) {
return;
}
// Now that we have received an ack, we might be able to send packets which
// are queued locally, or drain streams which are blocked.
if (defer_send_in_response_to_packets_) {
send_alarm_->Update(clock_->ApproximateNow(), QuicTime::Delta::Zero());
} else {
WriteAndBundleAcksIfNotBlocked();
}
}
void QuicConnection::MaybeActivateLegacyVersionEncapsulation() {
if (!legacy_version_encapsulation_enabled_) {
return;
}
DCHECK(!legacy_version_encapsulation_in_progress_);
QUIC_BUG_IF(!packet_creator_.CanSetMaxPacketLength())
<< "Cannot activate Legacy Version Encapsulation mid-packet";
QUIC_BUG_IF(coalesced_packet_.length() != 0u)
<< "Cannot activate Legacy Version Encapsulation mid-coalesced-packet";
legacy_version_encapsulation_in_progress_ = true;
MaybeUpdatePacketCreatorMaxPacketLengthAndPadding();
}
void QuicConnection::MaybeDisactivateLegacyVersionEncapsulation() {
if (!legacy_version_encapsulation_in_progress_) {
return;
}
// Flush any remaining packet before disactivating encapsulation.
packet_creator_.FlushCurrentPacket();
DCHECK(legacy_version_encapsulation_enabled_);
legacy_version_encapsulation_in_progress_ = false;
MaybeUpdatePacketCreatorMaxPacketLengthAndPadding();
}
size_t QuicConnection::SendCryptoData(EncryptionLevel level,
size_t write_length,
QuicStreamOffset offset) {
if (write_length == 0) {
QUIC_BUG << "Attempt to send empty crypto frame";
return 0;
}
if (level == ENCRYPTION_INITIAL) {
MaybeActivateLegacyVersionEncapsulation();
}
size_t consumed_length;
{
ScopedPacketFlusher flusher(this);
consumed_length =
packet_creator_.ConsumeCryptoData(level, write_length, offset);
} // Added scope ensures packets are flushed before continuing.
MaybeDisactivateLegacyVersionEncapsulation();
return consumed_length;
}
QuicConsumedData QuicConnection::SendStreamData(QuicStreamId id,
size_t write_length,
QuicStreamOffset offset,
StreamSendingState state) {
if (state == NO_FIN && write_length == 0) {
QUIC_BUG << "Attempt to send empty stream frame";
return QuicConsumedData(0, false);
}
if (packet_creator_.encryption_level() == ENCRYPTION_INITIAL &&
QuicUtils::IsCryptoStreamId(transport_version(), id)) {
MaybeActivateLegacyVersionEncapsulation();
}
QuicConsumedData consumed_data(0, false);
{
// Opportunistically bundle an ack with every outgoing packet.
// Particularly, we want to bundle with handshake packets since we don't
// know which decrypter will be used on an ack packet following a handshake
// packet (a handshake packet from client to server could result in a REJ or
// a SHLO from the server, leading to two different decrypters at the
// server.)
ScopedPacketFlusher flusher(this);
consumed_data =
packet_creator_.ConsumeData(id, write_length, offset, state);
} // Added scope ensures packets are flushed before continuing.
MaybeDisactivateLegacyVersionEncapsulation();
return consumed_data;
}
bool QuicConnection::SendControlFrame(const QuicFrame& frame) {
if (SupportsMultiplePacketNumberSpaces() &&
(encryption_level_ == ENCRYPTION_INITIAL ||
encryption_level_ == ENCRYPTION_HANDSHAKE) &&
frame.type != PING_FRAME) {
// Allow PING frame to be sent without APPLICATION key. For example, when
// anti-amplification limit is used, client needs to send something to avoid
// handshake deadlock.
QUIC_DVLOG(1) << ENDPOINT << "Failed to send control frame: " << frame
<< " at encryption level: " << encryption_level_;
return false;
}
ScopedPacketFlusher flusher(this);
const bool consumed =
packet_creator_.ConsumeRetransmittableControlFrame(frame);
if (!consumed) {
QUIC_DVLOG(1) << ENDPOINT << "Failed to send control frame: " << frame;
return false;
}
if (frame.type == PING_FRAME) {
// Flush PING frame immediately.
packet_creator_.FlushCurrentPacket();
if (debug_visitor_ != nullptr) {
debug_visitor_->OnPingSent();
}
}
if (frame.type == BLOCKED_FRAME) {
stats_.blocked_frames_sent++;
}
return true;
}
void QuicConnection::OnStreamReset(QuicStreamId id,
QuicRstStreamErrorCode error) {
if (error == QUIC_STREAM_NO_ERROR) {
// All data for streams which are reset with QUIC_STREAM_NO_ERROR must
// be received by the peer.
return;
}
// Flush stream frames of reset stream.
if (packet_creator_.HasPendingStreamFramesOfStream(id)) {
ScopedPacketFlusher flusher(this);
packet_creator_.FlushCurrentPacket();
}
// TODO(ianswett): Consider checking for 3 RTOs when the last stream is
// cancelled as well.
}
const QuicConnectionStats& QuicConnection::GetStats() {
const RttStats* rtt_stats = sent_packet_manager_.GetRttStats();
// Update rtt and estimated bandwidth.
QuicTime::Delta min_rtt = rtt_stats->min_rtt();
if (min_rtt.IsZero()) {
// If min RTT has not been set, use initial RTT instead.
min_rtt = rtt_stats->initial_rtt();
}
stats_.min_rtt_us = min_rtt.ToMicroseconds();
QuicTime::Delta srtt = rtt_stats->SmoothedOrInitialRtt();
stats_.srtt_us = srtt.ToMicroseconds();
stats_.estimated_bandwidth = sent_packet_manager_.BandwidthEstimate();
sent_packet_manager_.GetSendAlgorithm()->PopulateConnectionStats(&stats_);
stats_.max_packet_size = packet_creator_.max_packet_length();
stats_.max_received_packet_size = largest_received_packet_size_;
return stats_;
}
void QuicConnection::OnCoalescedPacket(const QuicEncryptedPacket& packet) {
QueueCoalescedPacket(packet);
}
void QuicConnection::OnUndecryptablePacket(const QuicEncryptedPacket& packet,
EncryptionLevel decryption_level,
bool has_decryption_key) {
QUIC_DVLOG(1) << ENDPOINT << "Received undecryptable packet of length "
<< packet.length() << " with"
<< (has_decryption_key ? "" : "out") << " key at level "
<< decryption_level
<< " while connection is at encryption level "
<< encryption_level_;
DCHECK(EncryptionLevelIsValid(decryption_level));
if (encryption_level_ != ENCRYPTION_FORWARD_SECURE) {
++stats_.undecryptable_packets_received_before_handshake_complete;
}
const bool should_enqueue =
ShouldEnqueueUnDecryptablePacket(decryption_level, has_decryption_key);
if (should_enqueue) {
QueueUndecryptablePacket(packet, decryption_level);
}
if (debug_visitor_ != nullptr) {
debug_visitor_->OnUndecryptablePacket(decryption_level,
/*dropped=*/!should_enqueue);
}
}
bool QuicConnection::ShouldEnqueueUnDecryptablePacket(
EncryptionLevel decryption_level,
bool has_decryption_key) const {
if (encryption_level_ == ENCRYPTION_FORWARD_SECURE) {
// We do not expect to install any further keys.
return false;
}
if (undecryptable_packets_.size() >= max_undecryptable_packets_) {
// We do not queue more than max_undecryptable_packets_ packets.
return false;
}
if (has_decryption_key) {
// We already have the key for this decryption level, therefore no
// future keys will allow it be decrypted.
return false;
}
if (version().KnowsWhichDecrypterToUse() &&
decryption_level <= encryption_level_) {
// On versions that know which decrypter to use, we install keys in order
// so we will not get newer keys for lower encryption levels.
return false;
}
return true;
}
std::string QuicConnection::UndecryptablePacketsInfo() const {
std::string info = quiche::QuicheStrCat(
"num_undecryptable_packets: ", undecryptable_packets_.size(), " {");
for (const auto& packet : undecryptable_packets_) {
info = quiche::QuicheStrCat(
info, "[", EncryptionLevelToString(packet.encryption_level), ", ",
packet.packet->length(), ", ", packet.processed, "]");
}
info = quiche::QuicheStrCat(info, "}");
return info;
}
void QuicConnection::MaybeUpdatePacketCreatorMaxPacketLengthAndPadding() {
QuicByteCount max_packet_length = GetLimitedMaxPacketSize(long_term_mtu_);
if (legacy_version_encapsulation_in_progress_) {
DCHECK(legacy_version_encapsulation_enabled_);
const QuicByteCount minimum_overhead =
QuicLegacyVersionEncapsulator::GetMinimumOverhead(
legacy_version_encapsulation_sni_);
if (max_packet_length < minimum_overhead) {
QUIC_BUG << "Cannot apply Legacy Version Encapsulation overhead because "
<< "max_packet_length " << max_packet_length
<< " < minimum_overhead " << minimum_overhead;
legacy_version_encapsulation_in_progress_ = false;
legacy_version_encapsulation_enabled_ = false;
MaybeUpdatePacketCreatorMaxPacketLengthAndPadding();
return;
}
max_packet_length -= minimum_overhead;
}
packet_creator_.SetMaxPacketLength(max_packet_length);
}
void QuicConnection::ProcessUdpPacket(const QuicSocketAddress& self_address,
const QuicSocketAddress& peer_address,
const QuicReceivedPacket& packet) {
if (!connected_) {
return;
}
QUIC_DVLOG(2) << ENDPOINT << "Received encrypted " << packet.length()
<< " bytes:" << std::endl
<< quiche::QuicheTextUtils::HexDump(quiche::QuicheStringPiece(
packet.data(), packet.length()));
QUIC_BUG_IF(current_packet_data_ != nullptr)
<< "ProcessUdpPacket must not be called while processing a packet.";
if (debug_visitor_ != nullptr) {
debug_visitor_->OnPacketReceived(self_address, peer_address, packet);
}
last_size_ = packet.length();
current_packet_data_ = packet.data();
last_packet_destination_address_ = self_address;
last_packet_source_address_ = peer_address;
if (!self_address_.IsInitialized()) {
self_address_ = last_packet_destination_address_;
}
if (!direct_peer_address_.IsInitialized()) {
UpdatePeerAddress(last_packet_source_address_);
}
if (!effective_peer_address_.IsInitialized()) {
const QuicSocketAddress effective_peer_addr =
GetEffectivePeerAddressFromCurrentPacket();
// effective_peer_address_ must be initialized at the beginning of the
// first packet processed(here). If effective_peer_addr is uninitialized,
// just set effective_peer_address_ to the direct peer address.
effective_peer_address_ = effective_peer_addr.IsInitialized()
? effective_peer_addr
: direct_peer_address_;
}
stats_.bytes_received += packet.length();
++stats_.packets_received;
if (EnforceAntiAmplificationLimit()) {
bytes_received_before_address_validation_ += last_size_;
}
// Ensure the time coming from the packet reader is within 2 minutes of now.
if (std::abs((packet.receipt_time() - clock_->ApproximateNow()).ToSeconds()) >
2 * 60) {
QUIC_BUG << "Packet receipt time:"
<< packet.receipt_time().ToDebuggingValue()
<< " too far from current time:"
<< clock_->ApproximateNow().ToDebuggingValue();
}
time_of_last_received_packet_ = packet.receipt_time();
QUIC_DVLOG(1) << ENDPOINT << "time of last received packet: "
<< packet.receipt_time().ToDebuggingValue();
ScopedPacketFlusher flusher(this);
if (!framer_.ProcessPacket(packet)) {
// If we are unable to decrypt this packet, it might be
// because the CHLO or SHLO packet was lost.
QUIC_DVLOG(1) << ENDPOINT
<< "Unable to process packet. Last packet processed: "
<< last_header_.packet_number;
current_packet_data_ = nullptr;
is_current_packet_connectivity_probing_ = false;
MaybeProcessCoalescedPackets();
return;
}
++stats_.packets_processed;
QUIC_DLOG_IF(INFO, active_effective_peer_migration_type_ != NO_CHANGE)
<< "sent_packet_manager_.GetLargestObserved() = "
<< sent_packet_manager_.GetLargestObserved()
<< ", highest_packet_sent_before_effective_peer_migration_ = "
<< highest_packet_sent_before_effective_peer_migration_;
if (active_effective_peer_migration_type_ != NO_CHANGE &&
sent_packet_manager_.GetLargestObserved().IsInitialized() &&
(!highest_packet_sent_before_effective_peer_migration_.IsInitialized() ||
sent_packet_manager_.GetLargestObserved() >
highest_packet_sent_before_effective_peer_migration_)) {
if (perspective_ == Perspective::IS_SERVER) {
OnEffectivePeerMigrationValidated();
}
}
MaybeProcessCoalescedPackets();
MaybeProcessUndecryptablePackets();
MaybeSendInResponseToPacket();
SetPingAlarm();
current_packet_data_ = nullptr;
is_current_packet_connectivity_probing_ = false;
}
void QuicConnection::OnBlockedWriterCanWrite() {
writer_->SetWritable();
OnCanWrite();
}
void QuicConnection::OnCanWrite() {
if (!connected_) {
return;
}
if (GetQuicReloadableFlag(
quic_close_connection_in_on_can_write_with_blocked_writer)) {
QUIC_RELOADABLE_FLAG_COUNT(
quic_close_connection_in_on_can_write_with_blocked_writer);
if (writer_->IsWriteBlocked()) {
const std::string error_details =
"Writer is blocked while calling OnCanWrite.";
QUIC_BUG << ENDPOINT << error_details;
CloseConnection(QUIC_INTERNAL_ERROR, error_details,
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
return;
}
} else {
DCHECK(!writer_->IsWriteBlocked());
}
// Add a flusher to ensure the connection is marked app-limited.
ScopedPacketFlusher flusher(this);
WriteQueuedPackets();
const QuicTime ack_timeout =
uber_received_packet_manager_.GetEarliestAckTimeout();
if (ack_timeout.IsInitialized() && ack_timeout <= clock_->ApproximateNow()) {
// Send an ACK now because either 1) we were write blocked when we last
// tried to send an ACK, or 2) both ack alarm and send alarm were set to
// go off together.
if (SupportsMultiplePacketNumberSpaces()) {
SendAllPendingAcks();
} else {
SendAck();
}
}
// TODO(danzh) PATH_RESPONSE is of more interest to the peer than ACK,
// evaluate if it's worth to send them before sending ACKs.
while (!pending_path_challenge_payloads_.empty()) {
QUIC_RELOADABLE_FLAG_COUNT_N(quic_send_path_response, 4, 5);
std::pair<QuicPathFrameBuffer, QuicSocketAddress> pair =
pending_path_challenge_payloads_.front();
if (!SendPathResponse(pair.first, pair.second)) {
break;
}
pending_path_challenge_payloads_.pop_front();
}
WriteNewData();
}
void QuicConnection::WriteNewData() {
// 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(HAS_RETRANSMITTABLE_DATA)) {
return;
}
{
ScopedPacketFlusher flusher(this);
visitor_->OnCanWrite();
}
// After the visitor writes, it may have caused the socket to become write
// blocked or the congestion manager to prohibit sending, so check again.
if (visitor_->WillingAndAbleToWrite() && !send_alarm_->IsSet() &&
CanWrite(HAS_RETRANSMITTABLE_DATA)) {
// 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 connections and events have had a chance to use the thread.
send_alarm_->Set(clock_->ApproximateNow());
}
}
void QuicConnection::WriteIfNotBlocked() {
if (!HandleWriteBlocked()) {
OnCanWrite();
}
}
void QuicConnection::WriteAndBundleAcksIfNotBlocked() {
if (!HandleWriteBlocked()) {
ScopedPacketFlusher flusher(this);
WriteIfNotBlocked();
}
}
bool QuicConnection::ProcessValidatedPacket(const QuicPacketHeader& header) {
if (perspective_ == Perspective::IS_SERVER && self_address_.IsInitialized() &&
last_packet_destination_address_.IsInitialized() &&
self_address_ != last_packet_destination_address_) {
// Allow change between pure IPv4 and equivalent mapped IPv4 address.
if (self_address_.port() != last_packet_destination_address_.port() ||
self_address_.host().Normalized() !=
last_packet_destination_address_.host().Normalized()) {
if (!visitor_->AllowSelfAddressChange()) {
CloseConnection(
QUIC_ERROR_MIGRATING_ADDRESS,
"Self address migration is not supported at the server.",
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
return false;
}
}
self_address_ = last_packet_destination_address_;
}
if (PacketCanReplaceConnectionId(header, perspective_) &&
server_connection_id_ != header.source_connection_id) {
QUIC_DLOG(INFO) << ENDPOINT << "Replacing connection ID "
<< server_connection_id_ << " with "
<< header.source_connection_id;
if (!original_destination_connection_id_.has_value()) {
original_destination_connection_id_ = server_connection_id_;
}
server_connection_id_ = header.source_connection_id;
packet_creator_.SetServerConnectionId(server_connection_id_);
}
if (!ValidateReceivedPacketNumber(header.packet_number)) {
return false;
}
if (!version_negotiated_) {
if (perspective_ == Perspective::IS_CLIENT) {
DCHECK(!header.version_flag || header.form != GOOGLE_QUIC_PACKET);
if (!VersionHasIetfInvariantHeader(framer_.transport_version())) {
// If the client gets a packet without the version flag from the server
// it should stop sending version since the version negotiation is done.
// IETF QUIC stops sending version once encryption level switches to
// forward secure.
packet_creator_.StopSendingVersion();
}
version_negotiated_ = true;
OnSuccessfulVersionNegotiation();
}
}
if (last_size_ > largest_received_packet_size_) {
largest_received_packet_size_ = last_size_;
}
if (perspective_ == Perspective::IS_SERVER &&
encryption_level_ == ENCRYPTION_INITIAL &&
last_size_ > packet_creator_.max_packet_length()) {
SetMaxPacketLength(last_size_);
}
return true;
}
bool QuicConnection::ValidateReceivedPacketNumber(
QuicPacketNumber packet_number) {
// If this packet has already been seen, or the sender has told us that it
// will not be retransmitted, then stop processing the packet.
if (!uber_received_packet_manager_.IsAwaitingPacket(
last_decrypted_packet_level_, packet_number)) {
QUIC_DLOG(INFO) << ENDPOINT << "Packet " << packet_number
<< " no longer being waited for at level "
<< static_cast<int>(last_decrypted_packet_level_)
<< ". Discarding.";
if (debug_visitor_ != nullptr) {
debug_visitor_->OnDuplicatePacket(packet_number);
}
return false;
}
return true;
}
void QuicConnection::WriteQueuedPackets() {
DCHECK(!writer_->IsWriteBlocked());
QUIC_CLIENT_HISTOGRAM_COUNTS("QuicSession.NumQueuedPacketsBeforeWrite",
buffered_packets_.size(), 1, 1000, 50, "");
while (!buffered_packets_.empty()) {
if (HandleWriteBlocked()) {
break;
}
const BufferedPacket& packet = buffered_packets_.front();
WriteResult result = writer_->WritePacket(
packet.encrypted_buffer.data(), packet.encrypted_buffer.length(),
packet.self_address.host(), packet.peer_address, per_packet_options_);
QUIC_DVLOG(1) << ENDPOINT << "Sending buffered packet, result: " << result;
if (IsMsgTooBig(result) &&
packet.encrypted_buffer.length() > long_term_mtu_) {
// When MSG_TOO_BIG is returned, the system typically knows what the
// actual MTU is, so there is no need to probe further.
// TODO(wub): Reduce max packet size to a safe default, or the actual MTU.
mtu_discoverer_.Disable();
mtu_discovery_alarm_->Cancel();
buffered_packets_.pop_front();
continue;
}
if (IsWriteError(result.status)) {
OnWriteError(result.error_code);
break;
}
if (result.status == WRITE_STATUS_OK ||
result.status == WRITE_STATUS_BLOCKED_DATA_BUFFERED) {
buffered_packets_.pop_front();
}
if (IsWriteBlockedStatus(result.status)) {
visitor_->OnWriteBlocked();
break;
}
}
}
void QuicConnection::SendProbingRetransmissions() {
while (sent_packet_manager_.GetSendAlgorithm()->ShouldSendProbingPacket() &&
CanWrite(HAS_RETRANSMITTABLE_DATA)) {
if (!visitor_->SendProbingData()) {
QUIC_DVLOG(1)
<< "Cannot send probing retransmissions: nothing to retransmit.";
break;
}
}
}
void QuicConnection::MarkZeroRttPacketsForRetransmission(int reject_reason) {
sent_packet_manager_.MarkZeroRttPacketsForRetransmission();
if (debug_visitor_ != nullptr && version().UsesTls()) {
debug_visitor_->OnZeroRttRejected(reject_reason);
}
}
void QuicConnection::NeuterUnencryptedPackets() {
sent_packet_manager_.NeuterUnencryptedPackets();
if (GetQuicReloadableFlag(
quic_neuter_initial_packet_in_coalescer_with_initial_key_discarded) &&
version().CanSendCoalescedPackets()) {
QUIC_RELOADABLE_FLAG_COUNT(
quic_neuter_initial_packet_in_coalescer_with_initial_key_discarded);
coalesced_packet_.NeuterInitialPacket();
}
// This may have changed the retransmission timer, so re-arm it.
SetRetransmissionAlarm();
if (default_enable_5rto_blackhole_detection_) {
QUIC_RELOADABLE_FLAG_COUNT_N(quic_default_enable_5rto_blackhole_detection2,
1, 3);
// Consider this as forward progress since this is called when initial key
// gets discarded (or previous unencrypted data is not needed anymore).
OnForwardProgressMade();
}
if (SupportsMultiplePacketNumberSpaces()) {
// Stop sending ack of initial packet number space.
uber_received_packet_manager_.ResetAckStates(ENCRYPTION_INITIAL);
// Re-arm ack alarm.
ack_alarm_->Update(uber_received_packet_manager_.GetEarliestAckTimeout(),
kAlarmGranularity);
}
}
bool QuicConnection::ShouldGeneratePacket(
HasRetransmittableData retransmittable,
IsHandshake handshake) {
DCHECK(handshake != IS_HANDSHAKE ||
QuicVersionUsesCryptoFrames(transport_version()))
<< ENDPOINT
<< "Handshake in STREAM frames should not check ShouldGeneratePacket";
return CanWrite(retransmittable);
}
const QuicFrames QuicConnection::MaybeBundleAckOpportunistically() {
QuicFrames frames;
const bool has_pending_ack =
uber_received_packet_manager_
.GetAckTimeout(QuicUtils::GetPacketNumberSpace(encryption_level_))
.IsInitialized();
if (!has_pending_ack && stop_waiting_count_ <= 1) {
// No need to send an ACK.
return frames;
}
ResetAckStates();
QUIC_DVLOG(1) << ENDPOINT << "Bundle an ACK opportunistically";
QuicFrame updated_ack_frame = GetUpdatedAckFrame();
QUIC_BUG_IF(updated_ack_frame.ack_frame->packets.Empty())
<< ENDPOINT << "Attempted to opportunistically bundle an empty "
<< encryption_level_ << " ACK, " << (has_pending_ack ? "" : "!")
<< "has_pending_ack, stop_waiting_count_ " << stop_waiting_count_;
frames.push_back(updated_ack_frame);
if (!no_stop_waiting_frames_) {
QuicStopWaitingFrame stop_waiting;
PopulateStopWaitingFrame(&stop_waiting);
frames.push_back(QuicFrame(stop_waiting));
}
return frames;
}
bool QuicConnection::CanWrite(HasRetransmittableData retransmittable) {
if (!connected_) {
return false;
}
if (fill_coalesced_packet_) {
// Try to coalesce packet, only allow to write when creator is on soft max
// packet length. Given the next created packet is going to fill current
// coalesced packet, do not check amplification factor.
return packet_creator_.HasSoftMaxPacketLength();
}
if (LimitedByAmplificationFactor()) {
// Server is constrained by the amplification restriction.
QUIC_CODE_COUNT(quic_throttled_by_amplification_limit);
QUIC_DVLOG(1) << ENDPOINT << "Constrained by amplification restriction";
++stats_.num_amplification_throttling;
return false;
}
if (sent_packet_manager_.pending_timer_transmission_count() > 0) {
// Force sending the retransmissions for HANDSHAKE, TLP, RTO, PROBING cases.
return true;
}
if (HandleWriteBlocked()) {
return false;
}
// Allow acks to be sent immediately.
if (retransmittable == NO_RETRANSMITTABLE_DATA) {
return true;
}
// If the send alarm is set, wait for it to fire.
if (send_alarm_->IsSet()) {
return false;
}
QuicTime now = clock_->Now();
QuicTime::Delta delay = sent_packet_manager_.TimeUntilSend(now);
if (delay.IsInfinite()) {
send_alarm_->Cancel();
return false;
}
// Scheduler requires a delay.
if (!delay.IsZero()) {
if (delay <= release_time_into_future_) {
// Required delay is within pace time into future, send now.
return true;
}
// Cannot send packet now because delay is too far in the future.
send_alarm_->Update(now + delay, kAlarmGranularity);
QUIC_DVLOG(1) << ENDPOINT << "Delaying sending " << delay.ToMilliseconds()
<< "ms";
return false;
}
return true;
}
QuicTime QuicConnection::CalculatePacketSentTime() {
const QuicTime now = clock_->Now();
if (!supports_release_time_ || per_packet_options_ == nullptr) {
// Don't change the release delay.
return now;
}
auto next_release_time_result = sent_packet_manager_.GetNextReleaseTime();
// Release before |now| is impossible.
QuicTime next_release_time =
std::max(now, next_release_time_result.release_time);
per_packet_options_->release_time_delay = next_release_time - now;
per_packet_options_->allow_burst = next_release_time_result.allow_burst;
return next_release_time;
}
bool QuicConnection::WritePacket(SerializedPacket* packet) {
if (sent_packet_manager_.GetLargestSentPacket().IsInitialized() &&
packet->packet_number < sent_packet_manager_.GetLargestSentPacket()) {
QUIC_BUG << "Attempt to write packet:" << packet->packet_number
<< " after:" << sent_packet_manager_.GetLargestSentPacket();
CloseConnection(QUIC_INTERNAL_ERROR, "Packet written out of order.",
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
return true;
}
const bool is_mtu_discovery = QuicUtils::ContainsFrameType(
packet->nonretransmittable_frames, MTU_DISCOVERY_FRAME);
const SerializedPacketFate fate = packet->fate;
// Termination packets are encrypted and saved, so don't exit early.
QuicErrorCode error_code = QUIC_NO_ERROR;
const bool is_termination_packet = IsTerminationPacket(*packet, &error_code);
QuicPacketNumber packet_number = packet->packet_number;
QuicPacketLength encrypted_length = packet->encrypted_length;
// Termination packets are eventually owned by TimeWaitListManager.
// Others are deleted at the end of this call.
if (is_termination_packet) {
if (termination_packets_ == nullptr) {
termination_packets_.reset(
new std::vector<std::unique_ptr<QuicEncryptedPacket>>);
}
// Copy the buffer so it's owned in the future.
char* buffer_copy = CopyBuffer(*packet);
termination_packets_->emplace_back(
new QuicEncryptedPacket(buffer_copy, encrypted_length, true));
if (error_code == QUIC_SILENT_IDLE_TIMEOUT) {
QUIC_RELOADABLE_FLAG_COUNT(quic_add_silent_idle_timeout);
DCHECK_EQ(Perspective::IS_SERVER, perspective_);
// TODO(fayang): populate histogram indicating the time elapsed from this
// connection gets closed to following client packets get received.
QUIC_DVLOG(1) << ENDPOINT
<< "Added silent connection close to termination packets, "
"num of termination packets: "
<< termination_packets_->size();
return true;
}
}
DCHECK_LE(encrypted_length, kMaxOutgoingPacketSize);
DCHECK(is_mtu_discov