net/quic/quic_stream_factory.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/quic/quic_stream_factory.h"
   6
   7 #include <algorithm>
   8 #include <set>
   9
  10 #include "base/location.h"
  11 #include "base/metrics/field_trial.h"
  12 #include "base/metrics/histogram_macros.h"
  13 #include "base/metrics/sparse_histogram.h"
  14 #include "base/rand_util.h"
  15 #include "base/single_thread_task_runner.h"
  16 #include "base/stl_util.h"
  17 #include "base/strings/string_util.h"
  18 #include "base/strings/stringprintf.h"
  19 #include "base/thread_task_runner_handle.h"
  20 #include "base/values.h"
  21 #include "net/base/net_errors.h"
  22 #include "net/cert/cert_verifier.h"
  23 #include "net/dns/host_resolver.h"
  24 #include "net/dns/single_request_host_resolver.h"
  25 #include "net/http/http_server_properties.h"
  26 #include "net/quic/crypto/channel_id_chromium.h"
  27 #include "net/quic/crypto/proof_verifier_chromium.h"
  28 #include "net/quic/crypto/quic_random.h"
  29 #include "net/quic/crypto/quic_server_info.h"
  30 #include "net/quic/port_suggester.h"
  31 #include "net/quic/quic_chromium_client_session.h"
  32 #include "net/quic/quic_clock.h"
  33 #include "net/quic/quic_connection.h"
  34 #include "net/quic/quic_connection_helper.h"
  35 #include "net/quic/quic_crypto_client_stream_factory.h"
  36 #include "net/quic/quic_default_packet_writer.h"
  37 #include "net/quic/quic_flags.h"
  38 #include "net/quic/quic_http_stream.h"
  39 #include "net/quic/quic_protocol.h"
  40 #include "net/quic/quic_server_id.h"
  41 #include "net/socket/client_socket_factory.h"
  42 #include "net/udp/udp_client_socket.h"
  43
  44 #if defined(OS_WIN)
  45 #include "base/win/windows_version.h"
  46 #endif
  47
  48 #if defined(USE_OPENSSL)
  49 #include <openssl/aead.h>
  50 #include "crypto/openssl_util.h"
  51 #else
  52 #include "base/cpu.h"
  53 #endif
  54
  55 using std::min;
  56
  57 namespace net {
  58
  59 namespace {
  60
  61 enum CreateSessionFailure {
  62   CREATION_ERROR_CONNECTING_SOCKET,
  63   CREATION_ERROR_SETTING_RECEIVE_BUFFER,
  64   CREATION_ERROR_SETTING_SEND_BUFFER,
  65   CREATION_ERROR_MAX
  66 };
  67
  68 // When a connection is idle for 30 seconds it will be closed.
  69 const int kIdleConnectionTimeoutSeconds = 30;
  70
  71 // The maximum receive window sizes for QUIC sessions and streams.
  72 const int32 kQuicSessionMaxRecvWindowSize = 15 * 1024 * 1024;  // 15 MB
  73 const int32 kQuicStreamMaxRecvWindowSize = 6 * 1024 * 1024;    // 6 MB
  74
  75 // Set the maximum number of undecryptable packets the connection will store.
  76 const int32 kMaxUndecryptablePackets = 100;
  77
  78 void HistogramCreateSessionFailure(enum CreateSessionFailure error) {
  79   UMA_HISTOGRAM_ENUMERATION("Net.QuicSession.CreationError", error,
  80                             CREATION_ERROR_MAX);
  81 }
  82
  83 bool IsEcdsaSupported() {
  84 #if defined(OS_WIN)
  85   if (base::win::GetVersion() < base::win::VERSION_VISTA)
  86     return false;
  87 #endif
  88
  89   return true;
  90 }
  91
  92 QuicConfig InitializeQuicConfig(const QuicTagVector& connection_options) {
  93   QuicConfig config;
  94   config.SetIdleConnectionStateLifetime(
  95       QuicTime::Delta::FromSeconds(kIdleConnectionTimeoutSeconds),
  96       QuicTime::Delta::FromSeconds(kIdleConnectionTimeoutSeconds));
  97   config.SetConnectionOptionsToSend(connection_options);
  98   return config;
  99 }
 100
 101 class DefaultPacketWriterFactory : public QuicConnection::PacketWriterFactory {
 102  public:
 103   explicit DefaultPacketWriterFactory(DatagramClientSocket* socket)
 104       : socket_(socket) {}
 105   ~DefaultPacketWriterFactory() override {}
 106
 107   QuicPacketWriter* Create(QuicConnection* connection) const override;
 108
 109  private:
 110   DatagramClientSocket* socket_;
 111 };
 112
 113 QuicPacketWriter* DefaultPacketWriterFactory::Create(
 114     QuicConnection* connection) const {
 115   scoped_ptr<QuicDefaultPacketWriter> writer(
 116       new QuicDefaultPacketWriter(socket_));
 117   writer->SetConnection(connection);
 118   return writer.release();
 119 }
 120
 121 }  // namespace
 122
 123 QuicStreamFactory::IpAliasKey::IpAliasKey() {}
 124
 125 QuicStreamFactory::IpAliasKey::IpAliasKey(IPEndPoint ip_endpoint,
 126                                           bool is_https)
 127     : ip_endpoint(ip_endpoint),
 128       is_https(is_https) {}
 129
 130 QuicStreamFactory::IpAliasKey::~IpAliasKey() {}
 131
 132 bool QuicStreamFactory::IpAliasKey::operator<(
 133     const QuicStreamFactory::IpAliasKey& other) const {
 134   if (!(ip_endpoint == other.ip_endpoint)) {
 135     return ip_endpoint < other.ip_endpoint;
 136   }
 137   return is_https < other.is_https;
 138 }
 139
 140 bool QuicStreamFactory::IpAliasKey::operator==(
 141     const QuicStreamFactory::IpAliasKey& other) const {
 142   return is_https == other.is_https &&
 143       ip_endpoint == other.ip_endpoint;
 144 };
 145
 146 // Responsible for creating a new QUIC session to the specified server, and
 147 // for notifying any associated requests when complete.
 148 class QuicStreamFactory::Job {
 149  public:
 150   Job(QuicStreamFactory* factory,
 151       HostResolver* host_resolver,
 152       const HostPortPair& host_port_pair,
 153       bool server_and_origin_have_same_host,
 154       bool is_https,
 155       bool was_alternative_service_recently_broken,
 156       PrivacyMode privacy_mode,
 157       int cert_verify_flags,
 158       bool is_post,
 159       QuicServerInfo* server_info,
 160       const BoundNetLog& net_log);
 161
 162   // Creates a new job to handle the resumption of for connecting an
 163   // existing session.
 164   Job(QuicStreamFactory* factory,
 165       HostResolver* host_resolver,
 166       QuicChromiumClientSession* session,
 167       QuicServerId server_id);
 168
 169   ~Job();
 170
 171   int Run(const CompletionCallback& callback);
 172
 173   int DoLoop(int rv);
 174   int DoResolveHost();
 175   int DoResolveHostComplete(int rv);
 176   int DoLoadServerInfo();
 177   int DoLoadServerInfoComplete(int rv);
 178   int DoConnect();
 179   int DoResumeConnect();
 180   int DoConnectComplete(int rv);
 181
 182   void OnIOComplete(int rv);
 183
 184   void RunAuxilaryJob();
 185
 186   void Cancel();
 187
 188   void CancelWaitForDataReadyCallback();
 189
 190   const QuicServerId server_id() const { return server_id_; }
 191
 192   base::WeakPtr<Job> GetWeakPtr() { return weak_factory_.GetWeakPtr(); }
 193
 194  private:
 195   enum IoState {
 196     STATE_NONE,
 197     STATE_RESOLVE_HOST,
 198     STATE_RESOLVE_HOST_COMPLETE,
 199     STATE_LOAD_SERVER_INFO,
 200     STATE_LOAD_SERVER_INFO_COMPLETE,
 201     STATE_CONNECT,
 202     STATE_RESUME_CONNECT,
 203     STATE_CONNECT_COMPLETE,
 204   };
 205   IoState io_state_;
 206
 207   QuicStreamFactory* factory_;
 208   SingleRequestHostResolver host_resolver_;
 209   QuicServerId server_id_;
 210   int cert_verify_flags_;
 211   // True if and only if server and origin have the same hostname.
 212   bool server_and_origin_have_same_host_;
 213   bool is_post_;
 214   bool was_alternative_service_recently_broken_;
 215   scoped_ptr<QuicServerInfo> server_info_;
 216   bool started_another_job_;
 217   const BoundNetLog net_log_;
 218   QuicChromiumClientSession* session_;
 219   CompletionCallback callback_;
 220   AddressList address_list_;
 221   base::TimeTicks dns_resolution_start_time_;
 222   base::TimeTicks dns_resolution_end_time_;
 223   base::WeakPtrFactory<Job> weak_factory_;
 224   DISALLOW_COPY_AND_ASSIGN(Job);
 225 };
 226
 227 QuicStreamFactory::Job::Job(QuicStreamFactory* factory,
 228                             HostResolver* host_resolver,
 229                             const HostPortPair& host_port_pair,
 230                             bool server_and_origin_have_same_host,
 231                             bool is_https,
 232                             bool was_alternative_service_recently_broken,
 233                             PrivacyMode privacy_mode,
 234                             int cert_verify_flags,
 235                             bool is_post,
 236                             QuicServerInfo* server_info,
 237                             const BoundNetLog& net_log)
 238     : io_state_(STATE_RESOLVE_HOST),
 239       factory_(factory),
 240       host_resolver_(host_resolver),
 241       server_id_(host_port_pair, is_https, privacy_mode),
 242       cert_verify_flags_(cert_verify_flags),
 243       server_and_origin_have_same_host_(server_and_origin_have_same_host),
 244       is_post_(is_post),
 245       was_alternative_service_recently_broken_(
 246           was_alternative_service_recently_broken),
 247       server_info_(server_info),
 248       started_another_job_(false),
 249       net_log_(net_log),
 250       session_(nullptr),
 251       weak_factory_(this) {
 252 }
 253
 254 QuicStreamFactory::Job::Job(QuicStreamFactory* factory,
 255                             HostResolver* host_resolver,
 256                             QuicChromiumClientSession* session,
 257                             QuicServerId server_id)
 258     : io_state_(STATE_RESUME_CONNECT),
 259       factory_(factory),
 260       host_resolver_(host_resolver),  // unused
 261       server_id_(server_id),
 262       cert_verify_flags_(0),                            // unused
 263       server_and_origin_have_same_host_(false),         // unused
 264       is_post_(false),                                  // unused
 265       was_alternative_service_recently_broken_(false),  // unused
 266       started_another_job_(false),                      // unused
 267       net_log_(session->net_log()),                     // unused
 268       session_(session),
 269       weak_factory_(this) {}
 270
 271 QuicStreamFactory::Job::~Job() {
 272   // If disk cache has a pending WaitForDataReadyCallback, cancel that callback.
 273   if (server_info_)
 274     server_info_->ResetWaitForDataReadyCallback();
 275 }
 276
 277 int QuicStreamFactory::Job::Run(const CompletionCallback& callback) {
 278   int rv = DoLoop(OK);
 279   if (rv == ERR_IO_PENDING)
 280     callback_ = callback;
 281
 282   return rv > 0 ? OK : rv;
 283 }
 284
 285 int QuicStreamFactory::Job::DoLoop(int rv) {
 286   do {
 287     IoState state = io_state_;
 288     io_state_ = STATE_NONE;
 289     switch (state) {
 290       case STATE_RESOLVE_HOST:
 291         CHECK_EQ(OK, rv);
 292         rv = DoResolveHost();
 293         break;
 294       case STATE_RESOLVE_HOST_COMPLETE:
 295         rv = DoResolveHostComplete(rv);
 296         break;
 297       case STATE_LOAD_SERVER_INFO:
 298         CHECK_EQ(OK, rv);
 299         rv = DoLoadServerInfo();
 300         break;
 301       case STATE_LOAD_SERVER_INFO_COMPLETE:
 302         rv = DoLoadServerInfoComplete(rv);
 303         break;
 304       case STATE_CONNECT:
 305         CHECK_EQ(OK, rv);
 306         rv = DoConnect();
 307         break;
 308       case STATE_RESUME_CONNECT:
 309         CHECK_EQ(OK, rv);
 310         rv = DoResumeConnect();
 311         break;
 312       case STATE_CONNECT_COMPLETE:
 313         rv = DoConnectComplete(rv);
 314         break;
 315       default:
 316         NOTREACHED() << "io_state_: " << io_state_;
 317         break;
 318     }
 319   } while (io_state_ != STATE_NONE && rv != ERR_IO_PENDING);
 320   return rv;
 321 }
 322
 323 void QuicStreamFactory::Job::OnIOComplete(int rv) {
 324   rv = DoLoop(rv);
 325   if (rv != ERR_IO_PENDING && !callback_.is_null()) {
 326     callback_.Run(rv);
 327   }
 328 }
 329
 330 void QuicStreamFactory::Job::RunAuxilaryJob() {
 331   int rv = Run(base::Bind(&QuicStreamFactory::OnJobComplete,
 332                           base::Unretained(factory_), this));
 333   if (rv != ERR_IO_PENDING)
 334     factory_->OnJobComplete(this, rv);
 335 }
 336
 337 void QuicStreamFactory::Job::Cancel() {
 338   callback_.Reset();
 339   if (session_) {
 340     // TODO(rtenneti): Temporary CHECK while investigating crbug.com/473893.
 341     DCHECK(session_->connection());
 342     session_->connection()->SendConnectionClose(QUIC_CONNECTION_CANCELLED);
 343   }
 344 }
 345
 346 void QuicStreamFactory::Job::CancelWaitForDataReadyCallback() {
 347   // If we are waiting for WaitForDataReadyCallback, then cancel the callback.
 348   if (io_state_ != STATE_LOAD_SERVER_INFO_COMPLETE)
 349     return;
 350   server_info_->CancelWaitForDataReadyCallback();
 351   OnIOComplete(OK);
 352 }
 353
 354 int QuicStreamFactory::Job::DoResolveHost() {
 355   // Start loading the data now, and wait for it after we resolve the host.
 356   if (server_info_) {
 357     server_info_->Start();
 358   }
 359
 360   io_state_ = STATE_RESOLVE_HOST_COMPLETE;
 361   dns_resolution_start_time_ = base::TimeTicks::Now();
 362   return host_resolver_.Resolve(
 363       HostResolver::RequestInfo(server_id_.host_port_pair()), DEFAULT_PRIORITY,
 364       &address_list_,
 365       base::Bind(&QuicStreamFactory::Job::OnIOComplete, GetWeakPtr()),
 366       net_log_);
 367 }
 368
 369 int QuicStreamFactory::Job::DoResolveHostComplete(int rv) {
 370   dns_resolution_end_time_ = base::TimeTicks::Now();
 371   UMA_HISTOGRAM_TIMES("Net.QuicSession.HostResolutionTime",
 372                       dns_resolution_end_time_ - dns_resolution_start_time_);
 373   if (rv != OK)
 374     return rv;
 375
 376   DCHECK(!factory_->HasActiveSession(server_id_));
 377
 378   // Inform the factory of this resolution, which will set up
 379   // a session alias, if possible.
 380   if (factory_->OnResolution(server_id_, address_list_)) {
 381     return OK;
 382   }
 383
 384   if (server_info_)
 385     io_state_ = STATE_LOAD_SERVER_INFO;
 386   else
 387     io_state_ = STATE_CONNECT;
 388   return OK;
 389 }
 390
 391 int QuicStreamFactory::Job::DoLoadServerInfo() {
 392   io_state_ = STATE_LOAD_SERVER_INFO_COMPLETE;
 393
 394   DCHECK(server_info_);
 395
 396   // To mitigate the effects of disk cache taking too long to load QUIC server
 397   // information, set up a timer to cancel WaitForDataReady's callback.
 398   if (factory_->load_server_info_timeout_srtt_multiplier_ > 0) {
 399     const int kMaxLoadServerInfoTimeoutMs = 50;
 400     // Wait for DiskCache a maximum of 50ms.
 401     int64 load_server_info_timeout_ms =
 402         min(static_cast<int>(
 403                 (factory_->load_server_info_timeout_srtt_multiplier_ *
 404                  factory_->GetServerNetworkStatsSmoothedRttInMicroseconds(
 405                      server_id_)) /
 406                 1000),
 407             kMaxLoadServerInfoTimeoutMs);
 408     if (load_server_info_timeout_ms > 0) {
 409       factory_->task_runner_->PostDelayedTask(
 410           FROM_HERE,
 411           base::Bind(&QuicStreamFactory::Job::CancelWaitForDataReadyCallback,
 412                      GetWeakPtr()),
 413           base::TimeDelta::FromMilliseconds(load_server_info_timeout_ms));
 414     }
 415   }
 416
 417   int rv = server_info_->WaitForDataReady(
 418       base::Bind(&QuicStreamFactory::Job::OnIOComplete, GetWeakPtr()));
 419   if (rv == ERR_IO_PENDING && factory_->enable_connection_racing()) {
 420     // If we are waiting to load server config from the disk cache, then start
 421     // another job.
 422     started_another_job_ = true;
 423     factory_->CreateAuxilaryJob(server_id_, cert_verify_flags_,
 424                                 server_and_origin_have_same_host_, is_post_,
 425                                 net_log_);
 426   }
 427   return rv;
 428 }
 429
 430 int QuicStreamFactory::Job::DoLoadServerInfoComplete(int rv) {
 431   UMA_HISTOGRAM_TIMES("Net.QuicServerInfo.DiskCacheWaitForDataReadyTime",
 432                       base::TimeTicks::Now() - dns_resolution_end_time_);
 433
 434   if (rv != OK)
 435     server_info_.reset();
 436
 437   if (started_another_job_ &&
 438       (!server_info_ || server_info_->state().server_config.empty() ||
 439        !factory_->CryptoConfigCacheIsEmpty(server_id_))) {
 440     // If we have started another job and if we didn't load the server config
 441     // from the disk cache or if we have received a new server config from the
 442     // server, then cancel the current job.
 443     io_state_ = STATE_NONE;
 444     return ERR_CONNECTION_CLOSED;
 445   }
 446
 447   io_state_ = STATE_CONNECT;
 448   return OK;
 449 }
 450
 451 int QuicStreamFactory::Job::DoConnect() {
 452   io_state_ = STATE_CONNECT_COMPLETE;
 453
 454   int rv = factory_->CreateSession(
 455       server_id_, cert_verify_flags_, server_info_.Pass(), address_list_,
 456       dns_resolution_end_time_, net_log_, &session_);
 457   if (rv != OK) {
 458     DCHECK(rv != ERR_IO_PENDING);
 459     DCHECK(!session_);
 460     return rv;
 461   }
 462
 463   if (!session_->connection()->connected()) {
 464     return ERR_CONNECTION_CLOSED;
 465   }
 466
 467   session_->StartReading();
 468   if (!session_->connection()->connected()) {
 469     return ERR_QUIC_PROTOCOL_ERROR;
 470   }
 471   bool require_confirmation = factory_->require_confirmation() ||
 472                               !server_and_origin_have_same_host_ || is_post_ ||
 473                               was_alternative_service_recently_broken_;
 474
 475   rv = session_->CryptoConnect(
 476       require_confirmation,
 477       base::Bind(&QuicStreamFactory::Job::OnIOComplete, GetWeakPtr()));
 478   return rv;
 479 }
 480
 481 int QuicStreamFactory::Job::DoResumeConnect() {
 482   io_state_ = STATE_CONNECT_COMPLETE;
 483
 484   int rv = session_->ResumeCryptoConnect(
 485       base::Bind(&QuicStreamFactory::Job::OnIOComplete, GetWeakPtr()));
 486
 487   return rv;
 488 }
 489
 490 int QuicStreamFactory::Job::DoConnectComplete(int rv) {
 491   if (rv != OK)
 492     return rv;
 493
 494   DCHECK(!factory_->HasActiveSession(server_id_));
 495   // There may well now be an active session for this IP.  If so, use the
 496   // existing session instead.
 497   AddressList address(session_->connection()->peer_address());
 498   if (factory_->OnResolution(server_id_, address)) {
 499     session_->connection()->SendConnectionClose(QUIC_CONNECTION_IP_POOLED);
 500     session_ = nullptr;
 501     return OK;
 502   }
 503
 504   factory_->ActivateSession(server_id_, session_);
 505
 506   return OK;
 507 }
 508
 509 QuicStreamRequest::QuicStreamRequest(QuicStreamFactory* factory)
 510     : factory_(factory) {}
 511
 512 QuicStreamRequest::~QuicStreamRequest() {
 513   if (factory_ && !callback_.is_null())
 514     factory_->CancelRequest(this);
 515 }
 516
 517 int QuicStreamRequest::Request(const HostPortPair& host_port_pair,
 518                                bool is_https,
 519                                PrivacyMode privacy_mode,
 520                                int cert_verify_flags,
 521                                base::StringPiece origin_host,
 522                                base::StringPiece method,
 523                                const BoundNetLog& net_log,
 524                                const CompletionCallback& callback) {
 525   DCHECK(!stream_);
 526   DCHECK(callback_.is_null());
 527   DCHECK(factory_);
 528   origin_host_ = origin_host.as_string();
 529   privacy_mode_ = privacy_mode;
 530   int rv =
 531       factory_->Create(host_port_pair, is_https, privacy_mode,
 532                        cert_verify_flags, origin_host, method, net_log, this);
 533   if (rv == ERR_IO_PENDING) {
 534     host_port_pair_ = host_port_pair;
 535     net_log_ = net_log;
 536     callback_ = callback;
 537   } else {
 538     factory_ = nullptr;
 539   }
 540   if (rv == OK)
 541     DCHECK(stream_);
 542   return rv;
 543 }
 544
 545 void QuicStreamRequest::set_stream(scoped_ptr<QuicHttpStream> stream) {
 546   DCHECK(stream);
 547   stream_ = stream.Pass();
 548 }
 549
 550 void QuicStreamRequest::OnRequestComplete(int rv) {
 551   factory_ = nullptr;
 552   callback_.Run(rv);
 553 }
 554
 555 scoped_ptr<QuicHttpStream> QuicStreamRequest::ReleaseStream() {
 556   DCHECK(stream_);
 557   return stream_.Pass();
 558 }
 559
 560 QuicStreamFactory::QuicStreamFactory(
 561     HostResolver* host_resolver,
 562     ClientSocketFactory* client_socket_factory,
 563     base::WeakPtr<HttpServerProperties> http_server_properties,
 564     CertVerifier* cert_verifier,
 565     CertPolicyEnforcer* cert_policy_enforcer,
 566     ChannelIDService* channel_id_service,
 567     TransportSecurityState* transport_security_state,
 568     QuicCryptoClientStreamFactory* quic_crypto_client_stream_factory,
 569     QuicRandom* random_generator,
 570     QuicClock* clock,
 571     size_t max_packet_length,
 572     const std::string& user_agent_id,
 573     const QuicVersionVector& supported_versions,
 574     bool enable_port_selection,
 575     bool always_require_handshake_confirmation,
 576     bool disable_connection_pooling,
 577     float load_server_info_timeout_srtt_multiplier,
 578     bool enable_connection_racing,
 579     bool enable_non_blocking_io,
 580     bool disable_disk_cache,
 581     bool prefer_aes,
 582     int max_number_of_lossy_connections,
 583     float packet_loss_threshold,
 584     int max_disabled_reasons,
 585     int threshold_public_resets_post_handshake,
 586     int threshold_timeouts_with_open_streams,
 587     int socket_receive_buffer_size,
 588     const QuicTagVector& connection_options)
 589     : require_confirmation_(true),
 590       host_resolver_(host_resolver),
 591       client_socket_factory_(client_socket_factory),
 592       http_server_properties_(http_server_properties),
 593       transport_security_state_(transport_security_state),
 594       quic_server_info_factory_(nullptr),
 595       quic_crypto_client_stream_factory_(quic_crypto_client_stream_factory),
 596       random_generator_(random_generator),
 597       clock_(clock),
 598       max_packet_length_(max_packet_length),
 599       config_(InitializeQuicConfig(connection_options)),
 600       supported_versions_(supported_versions),
 601       enable_port_selection_(enable_port_selection),
 602       always_require_handshake_confirmation_(
 603           always_require_handshake_confirmation),
 604       disable_connection_pooling_(disable_connection_pooling),
 605       load_server_info_timeout_srtt_multiplier_(
 606           load_server_info_timeout_srtt_multiplier),
 607       enable_connection_racing_(enable_connection_racing),
 608       enable_non_blocking_io_(enable_non_blocking_io),
 609       disable_disk_cache_(disable_disk_cache),
 610       prefer_aes_(prefer_aes),
 611       max_number_of_lossy_connections_(max_number_of_lossy_connections),
 612       packet_loss_threshold_(packet_loss_threshold),
 613       max_disabled_reasons_(max_disabled_reasons),
 614       num_public_resets_post_handshake_(0),
 615       num_timeouts_with_open_streams_(0),
 616       max_public_resets_post_handshake_(0),
 617       max_timeouts_with_open_streams_(0),
 618       threshold_timeouts_with_open_streams_(
 619           threshold_timeouts_with_open_streams),
 620       threshold_public_resets_post_handshake_(
 621           threshold_public_resets_post_handshake),
 622       socket_receive_buffer_size_(socket_receive_buffer_size),
 623       port_seed_(random_generator_->RandUint64()),
 624       check_persisted_supports_quic_(true),
 625       task_runner_(nullptr),
 626       weak_factory_(this) {
 627   DCHECK(transport_security_state_);
 628   crypto_config_.set_user_agent_id(user_agent_id);
 629   crypto_config_.AddCanonicalSuffix(".c.youtube.com");
 630   crypto_config_.AddCanonicalSuffix(".googlevideo.com");
 631   crypto_config_.AddCanonicalSuffix(".googleusercontent.com");
 632   crypto_config_.SetProofVerifier(new ProofVerifierChromium(
 633       cert_verifier, cert_policy_enforcer, transport_security_state));
 634   // TODO(rtenneti): http://crbug.com/487355. Temporary fix for b/20760730 until
 635   // channel_id_service is supported in cronet.
 636   if (channel_id_service) {
 637     crypto_config_.SetChannelIDSource(
 638         new ChannelIDSourceChromium(channel_id_service));
 639   }
 640 #if defined(USE_OPENSSL)
 641   crypto::EnsureOpenSSLInit();
 642   bool has_aes_hardware_support = !!EVP_has_aes_hardware();
 643 #else
 644   base::CPU cpu;
 645   bool has_aes_hardware_support = cpu.has_aesni() && cpu.has_avx();
 646 #endif
 647   UMA_HISTOGRAM_BOOLEAN("Net.QuicSession.PreferAesGcm",
 648                         has_aes_hardware_support);
 649   if (has_aes_hardware_support || prefer_aes_)
 650     crypto_config_.PreferAesGcm();
 651   if (!IsEcdsaSupported())
 652     crypto_config_.DisableEcdsa();
 653 }
 654
 655 QuicStreamFactory::~QuicStreamFactory() {
 656   CloseAllSessions(ERR_ABORTED);
 657   while (!all_sessions_.empty()) {
 658     delete all_sessions_.begin()->first;
 659     all_sessions_.erase(all_sessions_.begin());
 660   }
 661   while (!active_jobs_.empty()) {
 662     const QuicServerId server_id = active_jobs_.begin()->first;
 663     STLDeleteElements(&(active_jobs_[server_id]));
 664     active_jobs_.erase(server_id);
 665   }
 666 }
 667
 668 void QuicStreamFactory::set_require_confirmation(bool require_confirmation) {
 669   require_confirmation_ = require_confirmation;
 670   if (http_server_properties_ && (!(local_address_ == IPEndPoint()))) {
 671     http_server_properties_->SetSupportsQuic(!require_confirmation,
 672                                              local_address_.address());
 673   }
 674 }
 675
 676 int QuicStreamFactory::Create(const HostPortPair& host_port_pair,
 677                               bool is_https,
 678                               PrivacyMode privacy_mode,
 679                               int cert_verify_flags,
 680                               base::StringPiece origin_host,
 681                               base::StringPiece method,
 682                               const BoundNetLog& net_log,
 683                               QuicStreamRequest* request) {
 684   QuicServerId server_id(host_port_pair, is_https, privacy_mode);
 685   SessionMap::iterator it = active_sessions_.find(server_id);
 686   if (it != active_sessions_.end()) {
 687     QuicChromiumClientSession* session = it->second;
 688     if (!session->CanPool(origin_host.as_string(), privacy_mode))
 689       return ERR_ALTERNATIVE_CERT_NOT_VALID_FOR_ORIGIN;
 690     request->set_stream(CreateFromSession(session));
 691     return OK;
 692   }
 693
 694   if (HasActiveJob(server_id)) {
 695     active_requests_[request] = server_id;
 696     job_requests_map_[server_id].insert(request);
 697     return ERR_IO_PENDING;
 698   }
 699
 700   // TODO(rtenneti): |task_runner_| is used by the Job. Initialize task_runner_
 701   // in the constructor after WebRequestActionWithThreadsTest.* tests are fixed.
 702   if (!task_runner_)
 703     task_runner_ = base::ThreadTaskRunnerHandle::Get().get();
 704
 705   QuicServerInfo* quic_server_info = nullptr;
 706   if (quic_server_info_factory_) {
 707     bool load_from_disk_cache = !disable_disk_cache_;
 708     if (http_server_properties_) {
 709       const AlternativeServiceMap& alternative_service_map =
 710           http_server_properties_->alternative_service_map();
 711       AlternativeServiceMap::const_iterator map_it =
 712           alternative_service_map.Peek(server_id.host_port_pair());
 713       if (map_it != alternative_service_map.end()) {
 714         const AlternativeServiceInfoVector& alternative_service_info_vector =
 715             map_it->second;
 716         AlternativeServiceInfoVector::const_iterator it;
 717         for (it = alternative_service_info_vector.begin();
 718              it != alternative_service_info_vector.end(); ++it) {
 719           if (it->alternative_service.protocol == QUIC)
 720             break;
 721         }
 722         // If there is no entry for QUIC, consider that as a new server and
 723         // don't wait for Cache thread to load the data for that server.
 724         if (it == alternative_service_info_vector.end())
 725           load_from_disk_cache = false;
 726       }
 727     }
 728     if (load_from_disk_cache && CryptoConfigCacheIsEmpty(server_id)) {
 729       quic_server_info = quic_server_info_factory_->GetForServer(server_id);
 730     }
 731   }
 732
 733   bool server_and_origin_have_same_host = host_port_pair.host() == origin_host;
 734   scoped_ptr<Job> job(new Job(this, host_resolver_, host_port_pair,
 735                               server_and_origin_have_same_host, is_https,
 736                               WasQuicRecentlyBroken(server_id), privacy_mode,
 737                               cert_verify_flags, method == "POST" /* is_post */,
 738                               quic_server_info, net_log));
 739   int rv = job->Run(base::Bind(&QuicStreamFactory::OnJobComplete,
 740                                base::Unretained(this), job.get()));
 741   if (rv == ERR_IO_PENDING) {
 742     active_requests_[request] = server_id;
 743     job_requests_map_[server_id].insert(request);
 744     active_jobs_[server_id].insert(job.release());
 745     return rv;
 746   }
 747   if (rv == OK) {
 748     it = active_sessions_.find(server_id);
 749     DCHECK(it != active_sessions_.end());
 750     QuicChromiumClientSession* session = it->second;
 751     if (!session->CanPool(origin_host.as_string(), privacy_mode))
 752       return ERR_ALTERNATIVE_CERT_NOT_VALID_FOR_ORIGIN;
 753     request->set_stream(CreateFromSession(session));
 754   }
 755   return rv;
 756 }
 757
 758 void QuicStreamFactory::CreateAuxilaryJob(const QuicServerId server_id,
 759                                           int cert_verify_flags,
 760                                           bool server_and_origin_have_same_host,
 761                                           bool is_post,
 762                                           const BoundNetLog& net_log) {
 763   Job* aux_job =
 764       new Job(this, host_resolver_, server_id.host_port_pair(),
 765               server_and_origin_have_same_host, server_id.is_https(),
 766               WasQuicRecentlyBroken(server_id), server_id.privacy_mode(),
 767               cert_verify_flags, is_post, nullptr, net_log);
 768   active_jobs_[server_id].insert(aux_job);
 769   task_runner_->PostTask(FROM_HERE,
 770                          base::Bind(&QuicStreamFactory::Job::RunAuxilaryJob,
 771                                     aux_job->GetWeakPtr()));
 772 }
 773
 774 bool QuicStreamFactory::OnResolution(
 775     const QuicServerId& server_id,
 776     const AddressList& address_list) {
 777   DCHECK(!HasActiveSession(server_id));
 778   if (disable_connection_pooling_) {
 779     return false;
 780   }
 781   for (const IPEndPoint& address : address_list) {
 782     const IpAliasKey ip_alias_key(address, server_id.is_https());
 783     if (!ContainsKey(ip_aliases_, ip_alias_key))
 784       continue;
 785
 786     const SessionSet& sessions = ip_aliases_[ip_alias_key];
 787     for (QuicChromiumClientSession* session : sessions) {
 788       if (!session->CanPool(server_id.host(), server_id.privacy_mode()))
 789         continue;
 790       active_sessions_[server_id] = session;
 791       session_aliases_[session].insert(server_id);
 792       return true;
 793     }
 794   }
 795   return false;
 796 }
 797
 798 void QuicStreamFactory::OnJobComplete(Job* job, int rv) {
 799   QuicServerId server_id = job->server_id();
 800   if (rv != OK) {
 801     JobSet* jobs = &(active_jobs_[server_id]);
 802     if (jobs->size() > 1) {
 803       // If there is another pending job, then we can delete this job and let
 804       // the other job handle the request.
 805       job->Cancel();
 806       jobs->erase(job);
 807       delete job;
 808       return;
 809     }
 810   }
 811
 812   if (rv == OK) {
 813     if (!always_require_handshake_confirmation_)
 814       set_require_confirmation(false);
 815
 816     // Create all the streams, but do not notify them yet.
 817     SessionMap::iterator session_it = active_sessions_.find(server_id);
 818     for (RequestSet::iterator request_it = job_requests_map_[server_id].begin();
 819          request_it != job_requests_map_[server_id].end();) {
 820       DCHECK(session_it != active_sessions_.end());
 821       QuicChromiumClientSession* session = session_it->second;
 822       QuicStreamRequest* request = *request_it;
 823       if (!session->CanPool(request->origin_host(), request->privacy_mode())) {
 824         RequestSet::iterator old_request_it = request_it;
 825         ++request_it;
 826         // Remove request from containers so that OnRequestComplete() is not
 827         // called later again on the same request.
 828         job_requests_map_[server_id].erase(old_request_it);
 829         active_requests_.erase(request);
 830         // Notify request of certificate error.
 831         request->OnRequestComplete(ERR_ALTERNATIVE_CERT_NOT_VALID_FOR_ORIGIN);
 832         continue;
 833       }
 834       request->set_stream(CreateFromSession(session));
 835       ++request_it;
 836     }
 837   }
 838
 839   while (!job_requests_map_[server_id].empty()) {
 840     RequestSet::iterator it = job_requests_map_[server_id].begin();
 841     QuicStreamRequest* request = *it;
 842     job_requests_map_[server_id].erase(it);
 843     active_requests_.erase(request);
 844     // Even though we're invoking callbacks here, we don't need to worry
 845     // about |this| being deleted, because the factory is owned by the
 846     // profile which can not be deleted via callbacks.
 847     request->OnRequestComplete(rv);
 848   }
 849
 850   for (Job* other_job : active_jobs_[server_id]) {
 851     if (other_job != job)
 852       other_job->Cancel();
 853   }
 854
 855   STLDeleteElements(&(active_jobs_[server_id]));
 856   active_jobs_.erase(server_id);
 857   job_requests_map_.erase(server_id);
 858 }
 859
 860 scoped_ptr<QuicHttpStream> QuicStreamFactory::CreateFromSession(
 861     QuicChromiumClientSession* session) {
 862   return scoped_ptr<QuicHttpStream>(new QuicHttpStream(session->GetWeakPtr()));
 863 }
 864
 865 QuicChromiumClientSession::QuicDisabledReason
 866 QuicStreamFactory::QuicDisabledReason(uint16 port) const {
 867   if (max_number_of_lossy_connections_ > 0 &&
 868       number_of_lossy_connections_.find(port) !=
 869           number_of_lossy_connections_.end() &&
 870       number_of_lossy_connections_.at(port) >=
 871           max_number_of_lossy_connections_) {
 872     return QuicChromiumClientSession::QUIC_DISABLED_BAD_PACKET_LOSS_RATE;
 873   }
 874   if (threshold_public_resets_post_handshake_ > 0 &&
 875       num_public_resets_post_handshake_ >=
 876           threshold_public_resets_post_handshake_) {
 877     return QuicChromiumClientSession::QUIC_DISABLED_PUBLIC_RESET_POST_HANDSHAKE;
 878   }
 879   if (threshold_timeouts_with_open_streams_ > 0 &&
 880       num_timeouts_with_open_streams_ >=
 881           threshold_timeouts_with_open_streams_) {
 882     return QuicChromiumClientSession::QUIC_DISABLED_TIMEOUT_WITH_OPEN_STREAMS;
 883   }
 884   return QuicChromiumClientSession::QUIC_DISABLED_NOT;
 885 }
 886
 887 const char* QuicStreamFactory::QuicDisabledReasonString() const {
 888   // TODO(ckrasic) - better solution for port/lossy connections?
 889   const uint16 port = 443;
 890   switch (QuicDisabledReason(port)) {
 891     case QuicChromiumClientSession::QUIC_DISABLED_BAD_PACKET_LOSS_RATE:
 892       return "Bad packet loss rate.";
 893     case QuicChromiumClientSession::QUIC_DISABLED_PUBLIC_RESET_POST_HANDSHAKE:
 894       return "Public resets after successful handshakes.";
 895     case QuicChromiumClientSession::QUIC_DISABLED_TIMEOUT_WITH_OPEN_STREAMS:
 896       return "Connection timeouts with streams open.";
 897     default:
 898       return "";
 899   }
 900 }
 901
 902 bool QuicStreamFactory::IsQuicDisabled(uint16 port) {
 903   return QuicDisabledReason(port) !=
 904          QuicChromiumClientSession::QUIC_DISABLED_NOT;
 905 }
 906
 907 bool QuicStreamFactory::OnHandshakeConfirmed(QuicChromiumClientSession* session,
 908                                              float packet_loss_rate) {
 909   DCHECK(session);
 910   uint16 port = session->server_id().port();
 911   if (packet_loss_rate < packet_loss_threshold_) {
 912     number_of_lossy_connections_[port] = 0;
 913     return false;
 914   }
 915
 916   if (http_server_properties_) {
 917     // We mark it as recently broken, which means that 0-RTT will be disabled
 918     // but we'll still race.
 919     http_server_properties_->MarkAlternativeServiceRecentlyBroken(
 920         AlternativeService(QUIC, session->server_id().host(), port));
 921   }
 922
 923   bool was_quic_disabled = IsQuicDisabled(port);
 924   ++number_of_lossy_connections_[port];
 925
 926   // Collect data for port 443 for packet loss events.
 927   if (port == 443 && max_number_of_lossy_connections_ > 0) {
 928     UMA_HISTOGRAM_SPARSE_SLOWLY(
 929         base::StringPrintf("Net.QuicStreamFactory.BadPacketLossEvents%d",
 930                            max_number_of_lossy_connections_),
 931         std::min(number_of_lossy_connections_[port],
 932                  max_number_of_lossy_connections_));
 933   }
 934
 935   bool is_quic_disabled = IsQuicDisabled(port);
 936   if (is_quic_disabled) {
 937     // Close QUIC connection if Quic is disabled for this port.
 938     session->CloseSessionOnErrorAndNotifyFactoryLater(
 939         ERR_ABORTED, QUIC_BAD_PACKET_LOSS_RATE);
 940
 941     // If this bad packet loss rate disabled the QUIC, then record it.
 942     if (!was_quic_disabled)
 943       UMA_HISTOGRAM_SPARSE_SLOWLY("Net.QuicStreamFactory.QuicIsDisabled", port);
 944   }
 945   return is_quic_disabled;
 946 }
 947
 948 void QuicStreamFactory::OnIdleSession(QuicChromiumClientSession* session) {}
 949
 950 void QuicStreamFactory::OnSessionGoingAway(QuicChromiumClientSession* session) {
 951   const AliasSet& aliases = session_aliases_[session];
 952   for (AliasSet::const_iterator it = aliases.begin(); it != aliases.end();
 953        ++it) {
 954     DCHECK(active_sessions_.count(*it));
 955     DCHECK_EQ(session, active_sessions_[*it]);
 956     // Track sessions which have recently gone away so that we can disable
 957     // port suggestions.
 958     if (session->goaway_received()) {
 959       gone_away_aliases_.insert(*it);
 960     }
 961
 962     active_sessions_.erase(*it);
 963     ProcessGoingAwaySession(session, *it, true);
 964   }
 965   ProcessGoingAwaySession(session, all_sessions_[session], false);
 966   if (!aliases.empty()) {
 967     const IpAliasKey ip_alias_key(session->connection()->peer_address(),
 968                                   aliases.begin()->is_https());
 969     ip_aliases_[ip_alias_key].erase(session);
 970     if (ip_aliases_[ip_alias_key].empty()) {
 971       ip_aliases_.erase(ip_alias_key);
 972     }
 973   }
 974   session_aliases_.erase(session);
 975 }
 976
 977 void QuicStreamFactory::MaybeDisableQuic(QuicChromiumClientSession* session) {
 978   DCHECK(session);
 979   uint16 port = session->server_id().port();
 980   if (IsQuicDisabled(port))
 981     return;
 982
 983   // Expire the oldest disabled_reason if appropriate.  This enforces that we
 984   // only consider the max_disabled_reasons_ most recent sessions.
 985   QuicChromiumClientSession::QuicDisabledReason disabled_reason;
 986   if (static_cast<int>(disabled_reasons_.size()) == max_disabled_reasons_) {
 987     disabled_reason = disabled_reasons_.front();
 988     disabled_reasons_.pop_front();
 989     if (disabled_reason ==
 990         QuicChromiumClientSession::QUIC_DISABLED_PUBLIC_RESET_POST_HANDSHAKE) {
 991       --num_public_resets_post_handshake_;
 992     } else if (disabled_reason == QuicChromiumClientSession::
 993                                       QUIC_DISABLED_TIMEOUT_WITH_OPEN_STREAMS) {
 994       --num_timeouts_with_open_streams_;
 995     }
 996   }
 997   disabled_reason = session->disabled_reason();
 998   disabled_reasons_.push_back(disabled_reason);
 999   if (disabled_reason ==
1000       QuicChromiumClientSession::QUIC_DISABLED_PUBLIC_RESET_POST_HANDSHAKE) {
1001     ++num_public_resets_post_handshake_;
1002   } else if (disabled_reason == QuicChromiumClientSession::
1003                                     QUIC_DISABLED_TIMEOUT_WITH_OPEN_STREAMS) {
1004     ++num_timeouts_with_open_streams_;
1005   }
1006   if (num_timeouts_with_open_streams_ > max_timeouts_with_open_streams_) {
1007     max_timeouts_with_open_streams_ = num_timeouts_with_open_streams_;
1008     UMA_HISTOGRAM_CUSTOM_COUNTS("Net.QuicStreamFactory.TimeoutsWithOpenStreams",
1009                                 num_timeouts_with_open_streams_, 0, 20, 10);
1010   }
1011
1012   if (num_public_resets_post_handshake_ > max_public_resets_post_handshake_) {
1013     max_public_resets_post_handshake_ = num_public_resets_post_handshake_;
1014     UMA_HISTOGRAM_CUSTOM_COUNTS(
1015         "Net.QuicStreamFactory.PublicResetsPostHandshake",
1016         num_public_resets_post_handshake_, 0, 20, 10);
1017   }
1018
1019   if (IsQuicDisabled(port)) {
1020     if (disabled_reason ==
1021         QuicChromiumClientSession::QUIC_DISABLED_PUBLIC_RESET_POST_HANDSHAKE) {
1022       session->CloseSessionOnErrorAndNotifyFactoryLater(
1023           ERR_ABORTED, QUIC_PUBLIC_RESETS_POST_HANDSHAKE);
1024     } else if (disabled_reason == QuicChromiumClientSession::
1025                                       QUIC_DISABLED_TIMEOUT_WITH_OPEN_STREAMS) {
1026       session->CloseSessionOnErrorAndNotifyFactoryLater(
1027           ERR_ABORTED, QUIC_TIMEOUTS_WITH_OPEN_STREAMS);
1028     }
1029     UMA_HISTOGRAM_ENUMERATION("Net.QuicStreamFactory.DisabledReasons",
1030                               disabled_reason,
1031                               QuicChromiumClientSession::QUIC_DISABLED_MAX);
1032   }
1033 }
1034
1035 void QuicStreamFactory::OnSessionClosed(QuicChromiumClientSession* session) {
1036   DCHECK_EQ(0u, session->GetNumOpenStreams());
1037   MaybeDisableQuic(session);
1038   OnSessionGoingAway(session);
1039   delete session;
1040   all_sessions_.erase(session);
1041 }
1042
1043 void QuicStreamFactory::OnSessionConnectTimeout(
1044     QuicChromiumClientSession* session) {
1045   const AliasSet& aliases = session_aliases_[session];
1046   for (AliasSet::const_iterator it = aliases.begin(); it != aliases.end();
1047        ++it) {
1048     DCHECK(active_sessions_.count(*it));
1049     DCHECK_EQ(session, active_sessions_[*it]);
1050     active_sessions_.erase(*it);
1051   }
1052
1053   if (aliases.empty()) {
1054     return;
1055   }
1056
1057   const IpAliasKey ip_alias_key(session->connection()->peer_address(),
1058                                 aliases.begin()->is_https());
1059   ip_aliases_[ip_alias_key].erase(session);
1060   if (ip_aliases_[ip_alias_key].empty()) {
1061     ip_aliases_.erase(ip_alias_key);
1062   }
1063   QuicServerId server_id = *aliases.begin();
1064   session_aliases_.erase(session);
1065   Job* job = new Job(this, host_resolver_, session, server_id);
1066   active_jobs_[server_id].insert(job);
1067   int rv = job->Run(base::Bind(&QuicStreamFactory::OnJobComplete,
1068                                base::Unretained(this), job));
1069   DCHECK_EQ(ERR_IO_PENDING, rv);
1070 }
1071
1072 void QuicStreamFactory::CancelRequest(QuicStreamRequest* request) {
1073   DCHECK(ContainsKey(active_requests_, request));
1074   QuicServerId server_id = active_requests_[request];
1075   job_requests_map_[server_id].erase(request);
1076   active_requests_.erase(request);
1077 }
1078
1079 void QuicStreamFactory::CloseAllSessions(int error) {
1080   while (!active_sessions_.empty()) {
1081     size_t initial_size = active_sessions_.size();
1082     active_sessions_.begin()->second->CloseSessionOnError(error,
1083                                                           QUIC_INTERNAL_ERROR);
1084     DCHECK_NE(initial_size, active_sessions_.size());
1085   }
1086   while (!all_sessions_.empty()) {
1087     size_t initial_size = all_sessions_.size();
1088     all_sessions_.begin()->first->CloseSessionOnError(error,
1089                                                       QUIC_INTERNAL_ERROR);
1090     DCHECK_NE(initial_size, all_sessions_.size());
1091   }
1092   DCHECK(all_sessions_.empty());
1093 }
1094
1095 scoped_ptr<base::Value> QuicStreamFactory::QuicStreamFactoryInfoToValue()
1096     const {
1097   scoped_ptr<base::ListValue> list(new base::ListValue());
1098
1099   for (SessionMap::const_iterator it = active_sessions_.begin();
1100        it != active_sessions_.end(); ++it) {
1101     const QuicServerId& server_id = it->first;
1102     QuicChromiumClientSession* session = it->second;
1103     const AliasSet& aliases = session_aliases_.find(session)->second;
1104     // Only add a session to the list once.
1105     if (server_id == *aliases.begin()) {
1106       std::set<HostPortPair> hosts;
1107       for (AliasSet::const_iterator alias_it = aliases.begin();
1108            alias_it != aliases.end(); ++alias_it) {
1109         hosts.insert(alias_it->host_port_pair());
1110       }
1111       list->Append(session->GetInfoAsValue(hosts));
1112     }
1113   }
1114   return list.Pass();
1115 }
1116
1117 void QuicStreamFactory::ClearCachedStatesInCryptoConfig() {
1118   crypto_config_.ClearCachedStates();
1119 }
1120
1121 void QuicStreamFactory::OnIPAddressChanged() {
1122   CloseAllSessions(ERR_NETWORK_CHANGED);
1123   set_require_confirmation(true);
1124 }
1125
1126 void QuicStreamFactory::OnSSLConfigChanged() {
1127   CloseAllSessions(ERR_CERT_DATABASE_CHANGED);
1128 }
1129
1130 void QuicStreamFactory::OnCertAdded(const X509Certificate* cert) {
1131   CloseAllSessions(ERR_CERT_DATABASE_CHANGED);
1132 }
1133
1134 void QuicStreamFactory::OnCACertChanged(const X509Certificate* cert) {
1135   // We should flush the sessions if we removed trust from a
1136   // cert, because a previously trusted server may have become
1137   // untrusted.
1138   //
1139   // We should not flush the sessions if we added trust to a cert.
1140   //
1141   // Since the OnCACertChanged method doesn't tell us what
1142   // kind of change it is, we have to flush the socket
1143   // pools to be safe.
1144   CloseAllSessions(ERR_CERT_DATABASE_CHANGED);
1145 }
1146
1147 bool QuicStreamFactory::HasActiveSession(
1148     const QuicServerId& server_id) const {
1149   return ContainsKey(active_sessions_, server_id);
1150 }
1151
1152 bool QuicStreamFactory::HasActiveJob(const QuicServerId& key) const {
1153   return ContainsKey(active_jobs_, key);
1154 }
1155
1156 int QuicStreamFactory::CreateSession(const QuicServerId& server_id,
1157                                      int cert_verify_flags,
1158                                      scoped_ptr<QuicServerInfo> server_info,
1159                                      const AddressList& address_list,
1160                                      base::TimeTicks dns_resolution_end_time,
1161                                      const BoundNetLog& net_log,
1162                                      QuicChromiumClientSession** session) {
1163   bool enable_port_selection = enable_port_selection_;
1164   if (enable_port_selection &&
1165       ContainsKey(gone_away_aliases_, server_id)) {
1166     // Disable port selection when the server is going away.
1167     // There is no point in trying to return to the same server, if
1168     // that server is no longer handling requests.
1169     enable_port_selection = false;
1170     gone_away_aliases_.erase(server_id);
1171   }
1172
1173   QuicConnectionId connection_id = random_generator_->RandUint64();
1174   IPEndPoint addr = *address_list.begin();
1175   scoped_refptr<PortSuggester> port_suggester =
1176       new PortSuggester(server_id.host_port_pair(), port_seed_);
1177   DatagramSocket::BindType bind_type = enable_port_selection ?
1178       DatagramSocket::RANDOM_BIND :  // Use our callback.
1179       DatagramSocket::DEFAULT_BIND;  // Use OS to randomize.
1180   scoped_ptr<DatagramClientSocket> socket(
1181       client_socket_factory_->CreateDatagramClientSocket(
1182           bind_type,
1183           base::Bind(&PortSuggester::SuggestPort, port_suggester),
1184           net_log.net_log(), net_log.source()));
1185
1186   if (enable_non_blocking_io_ &&
1187       client_socket_factory_ == ClientSocketFactory::GetDefaultFactory()) {
1188 #if defined(OS_WIN)
1189     static_cast<UDPClientSocket*>(socket.get())->UseNonBlockingIO();
1190 #endif
1191   }
1192
1193   int rv = socket->Connect(addr);
1194
1195   if (rv != OK) {
1196     HistogramCreateSessionFailure(CREATION_ERROR_CONNECTING_SOCKET);
1197     return rv;
1198   }
1199   UMA_HISTOGRAM_COUNTS("Net.QuicEphemeralPortsSuggested",
1200                        port_suggester->call_count());
1201   if (enable_port_selection) {
1202     DCHECK_LE(1u, port_suggester->call_count());
1203   } else {
1204     DCHECK_EQ(0u, port_suggester->call_count());
1205   }
1206
1207   rv = socket->SetReceiveBufferSize(socket_receive_buffer_size_);
1208   if (rv != OK) {
1209     HistogramCreateSessionFailure(CREATION_ERROR_SETTING_RECEIVE_BUFFER);
1210     return rv;
1211   }
1212   // Set a buffer large enough to contain the initial CWND's worth of packet
1213   // to work around the problem with CHLO packets being sent out with the
1214   // wrong encryption level, when the send buffer is full.
1215   rv = socket->SetSendBufferSize(kMaxPacketSize * 20);
1216   if (rv != OK) {
1217     HistogramCreateSessionFailure(CREATION_ERROR_SETTING_SEND_BUFFER);
1218     return rv;
1219   }
1220
1221   socket->GetLocalAddress(&local_address_);
1222   if (check_persisted_supports_quic_ && http_server_properties_) {
1223     check_persisted_supports_quic_ = false;
1224     IPAddressNumber last_address;
1225     if (http_server_properties_->GetSupportsQuic(&last_address) &&
1226         last_address == local_address_.address()) {
1227       require_confirmation_ = false;
1228     }
1229   }
1230
1231   DefaultPacketWriterFactory packet_writer_factory(socket.get());
1232
1233   if (!helper_.get()) {
1234     helper_.reset(
1235         new QuicConnectionHelper(base::ThreadTaskRunnerHandle::Get().get(),
1236                                  clock_.get(), random_generator_));
1237   }
1238
1239   QuicConnection* connection = new QuicConnection(
1240       connection_id, addr, helper_.get(), packet_writer_factory,
1241       true /* owns_writer */, Perspective::IS_CLIENT, server_id.is_https(),
1242       supported_versions_);
1243   connection->set_max_packet_length(max_packet_length_);
1244
1245   InitializeCachedStateInCryptoConfig(server_id, server_info);
1246
1247   QuicConfig config = config_;
1248   config.SetSocketReceiveBufferToSend(socket_receive_buffer_size_);
1249   config.set_max_undecryptable_packets(kMaxUndecryptablePackets);
1250   config.SetInitialSessionFlowControlWindowToSend(
1251       kQuicSessionMaxRecvWindowSize);
1252   config.SetInitialStreamFlowControlWindowToSend(kQuicStreamMaxRecvWindowSize);
1253   int64 srtt = GetServerNetworkStatsSmoothedRttInMicroseconds(server_id);
1254   if (srtt > 0)
1255     config.SetInitialRoundTripTimeUsToSend(static_cast<uint32>(srtt));
1256   config.SetBytesForConnectionIdToSend(0);
1257
1258   if (quic_server_info_factory_ && !server_info) {
1259     // Start the disk cache loading so that we can persist the newer QUIC server
1260     // information and/or inform the disk cache that we have reused
1261     // |server_info|.
1262     server_info.reset(quic_server_info_factory_->GetForServer(server_id));
1263     server_info->Start();
1264   }
1265
1266   *session = new QuicChromiumClientSession(
1267       connection, socket.Pass(), this, quic_crypto_client_stream_factory_,
1268       transport_security_state_, server_info.Pass(), server_id,
1269       cert_verify_flags, config, &crypto_config_,
1270       network_connection_.GetDescription(), dns_resolution_end_time,
1271       base::ThreadTaskRunnerHandle::Get().get(), net_log.net_log());
1272
1273   all_sessions_[*session] = server_id;  // owning pointer
1274
1275   (*session)->Initialize();
1276   bool closed_during_initialize =
1277       !ContainsKey(all_sessions_, *session) ||
1278       !(*session)->connection()->connected();
1279   UMA_HISTOGRAM_BOOLEAN("Net.QuicSession.ClosedDuringInitializeSession",
1280                         closed_during_initialize);
1281   if (closed_during_initialize) {
1282     DLOG(DFATAL) << "Session closed during initialize";
1283     *session = nullptr;
1284     return ERR_CONNECTION_CLOSED;
1285   }
1286   return OK;
1287 }
1288
1289 void QuicStreamFactory::ActivateSession(const QuicServerId& server_id,
1290                                         QuicChromiumClientSession* session) {
1291   DCHECK(!HasActiveSession(server_id));
1292   UMA_HISTOGRAM_COUNTS("Net.QuicActiveSessions", active_sessions_.size());
1293   active_sessions_[server_id] = session;
1294   session_aliases_[session].insert(server_id);
1295   const IpAliasKey ip_alias_key(session->connection()->peer_address(),
1296                                 server_id.is_https());
1297   DCHECK(!ContainsKey(ip_aliases_[ip_alias_key], session));
1298   ip_aliases_[ip_alias_key].insert(session);
1299 }
1300
1301 int64 QuicStreamFactory::GetServerNetworkStatsSmoothedRttInMicroseconds(
1302     const QuicServerId& server_id) const {
1303   if (!http_server_properties_)
1304     return 0;
1305   const ServerNetworkStats* stats =
1306       http_server_properties_->GetServerNetworkStats(
1307           server_id.host_port_pair());
1308   if (stats == nullptr)
1309     return 0;
1310   return stats->srtt.InMicroseconds();
1311 }
1312
1313 bool QuicStreamFactory::WasQuicRecentlyBroken(
1314     const QuicServerId& server_id) const {
1315   if (!http_server_properties_)
1316     return false;
1317   const AlternativeService alternative_service(QUIC,
1318                                                server_id.host_port_pair());
1319   return http_server_properties_->WasAlternativeServiceRecentlyBroken(
1320       alternative_service);
1321 }
1322
1323 bool QuicStreamFactory::CryptoConfigCacheIsEmpty(
1324     const QuicServerId& server_id) {
1325   QuicCryptoClientConfig::CachedState* cached =
1326       crypto_config_.LookupOrCreate(server_id);
1327   return cached->IsEmpty();
1328 }
1329
1330 void QuicStreamFactory::InitializeCachedStateInCryptoConfig(
1331     const QuicServerId& server_id,
1332     const scoped_ptr<QuicServerInfo>& server_info) {
1333   // |server_info| will be NULL, if a non-empty server config already exists in
1334   // the memory cache. This is a minor optimization to avoid LookupOrCreate.
1335   if (!server_info)
1336     return;
1337
1338   QuicCryptoClientConfig::CachedState* cached =
1339       crypto_config_.LookupOrCreate(server_id);
1340   if (!cached->IsEmpty())
1341     return;
1342
1343   if (http_server_properties_) {
1344     if (quic_supported_servers_at_startup_.empty()) {
1345       for (const std::pair<const HostPortPair, AlternativeServiceInfoVector>&
1346                key_value : http_server_properties_->alternative_service_map()) {
1347         for (const AlternativeServiceInfo& alternative_service_info :
1348              key_value.second) {
1349           if (alternative_service_info.alternative_service.protocol == QUIC) {
1350             quic_supported_servers_at_startup_.insert(key_value.first);
1351             break;
1352           }
1353         }
1354       }
1355     }
1356
1357     // TODO(rtenneti): Delete the following histogram after collecting stats.
1358     // If the AlternativeServiceMap contained an entry for this host, check if
1359     // the disk cache contained an entry for it.
1360     if (ContainsKey(quic_supported_servers_at_startup_,
1361                     server_id.host_port_pair())) {
1362       UMA_HISTOGRAM_BOOLEAN(
1363           "Net.QuicServerInfo.ExpectConfigMissingFromDiskCache",
1364           server_info->state().server_config.empty());
1365     }
1366   }
1367
1368   if (!cached->Initialize(server_info->state().server_config,
1369                           server_info->state().source_address_token,
1370                           server_info->state().certs,
1371                           server_info->state().server_config_sig,
1372                           clock_->WallNow()))
1373     return;
1374
1375   if (!server_id.is_https()) {
1376     // Don't check the certificates for insecure QUIC.
1377     cached->SetProofValid();
1378   }
1379 }
1380
1381 void QuicStreamFactory::ProcessGoingAwaySession(
1382     QuicChromiumClientSession* session,
1383     const QuicServerId& server_id,
1384     bool session_was_active) {
1385   if (!http_server_properties_)
1386     return;
1387
1388   const QuicConnectionStats& stats = session->connection()->GetStats();
1389   const AlternativeService alternative_service(QUIC,
1390                                                server_id.host_port_pair());
1391   if (session->IsCryptoHandshakeConfirmed()) {
1392     http_server_properties_->ConfirmAlternativeService(alternative_service);
1393     ServerNetworkStats network_stats;
1394     network_stats.srtt = base::TimeDelta::FromMicroseconds(stats.srtt_us);
1395     network_stats.bandwidth_estimate = stats.estimated_bandwidth;
1396     http_server_properties_->SetServerNetworkStats(server_id.host_port_pair(),
1397                                                    network_stats);
1398     return;
1399   }
1400
1401   UMA_HISTOGRAM_COUNTS("Net.QuicHandshakeNotConfirmedNumPacketsReceived",
1402                        stats.packets_received);
1403
1404   if (!session_was_active)
1405     return;
1406
1407   // TODO(rch):  In the special case where the session has received no
1408   // packets from the peer, we should consider blacklisting this
1409   // differently so that we still race TCP but we don't consider the
1410   // session connected until the handshake has been confirmed.
1411   HistogramBrokenAlternateProtocolLocation(
1412       BROKEN_ALTERNATE_PROTOCOL_LOCATION_QUIC_STREAM_FACTORY);
1413
1414   // Since the session was active, there's no longer an
1415   // HttpStreamFactoryImpl::Job running which can mark it broken, unless the TCP
1416   // job also fails. So to avoid not using QUIC when we otherwise could, we mark
1417   // it as recently broken, which means that 0-RTT will be disabled but we'll
1418   // still race.
1419   http_server_properties_->MarkAlternativeServiceRecentlyBroken(
1420       alternative_service);
1421 }
1422
1423 }  // namespace net