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quic_connection.cc
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// 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 we are missing any packets from the peer, then we want to ack
// immediately. We need to check both before and after we process the
// current packet because we want to ack immediately when we discover
// a missing packet AND when we receive the last missing packet.
bool send_ack_immediately = received_packet_manager_.HasMissingPackets();
// 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 (received_packet_manager_.HasMissingPackets()) {
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 =