net/quic/quic_protocol.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_protocol.h"
   6
   7 #include "base/stl_util.h"
   8 #include "net/quic/quic_utils.h"
   9
  10 using base::StringPiece;
  11 using std::map;
  12 using std::numeric_limits;
  13 using std::ostream;
  14 using std::string;
  15
  16 namespace net {
  17
  18 size_t GetPacketHeaderSize(const QuicPacketHeader& header) {
  19   return GetPacketHeaderSize(header.public_header.connection_id_length,
  20                              header.public_header.version_flag,
  21                              header.public_header.sequence_number_length,
  22                              header.is_in_fec_group);
  23 }
  24
  25 size_t GetPacketHeaderSize(QuicConnectionIdLength connection_id_length,
  26                            bool include_version,
  27                            QuicSequenceNumberLength sequence_number_length,
  28                            InFecGroup is_in_fec_group) {
  29   return kPublicFlagsSize + connection_id_length +
  30       (include_version ? kQuicVersionSize : 0) + sequence_number_length +
  31       kPrivateFlagsSize + (is_in_fec_group == IN_FEC_GROUP ? kFecGroupSize : 0);
  32 }
  33
  34 size_t GetStartOfFecProtectedData(
  35     QuicConnectionIdLength connection_id_length,
  36     bool include_version,
  37     QuicSequenceNumberLength sequence_number_length) {
  38   return GetPacketHeaderSize(connection_id_length,
  39                              include_version,
  40                              sequence_number_length,
  41                              IN_FEC_GROUP);
  42 }
  43
  44 size_t GetStartOfEncryptedData(
  45     QuicConnectionIdLength connection_id_length,
  46     bool include_version,
  47     QuicSequenceNumberLength sequence_number_length) {
  48   // Don't include the fec size, since encryption starts before private flags.
  49   return GetPacketHeaderSize(connection_id_length,
  50                              include_version,
  51                              sequence_number_length,
  52                              NOT_IN_FEC_GROUP) - kPrivateFlagsSize;
  53 }
  54
  55 QuicPacketPublicHeader::QuicPacketPublicHeader()
  56     : connection_id(0),
  57       connection_id_length(PACKET_8BYTE_CONNECTION_ID),
  58       reset_flag(false),
  59       version_flag(false),
  60       sequence_number_length(PACKET_6BYTE_SEQUENCE_NUMBER) {
  61 }
  62
  63 QuicPacketPublicHeader::QuicPacketPublicHeader(
  64     const QuicPacketPublicHeader& other)
  65     : connection_id(other.connection_id),
  66       connection_id_length(other.connection_id_length),
  67       reset_flag(other.reset_flag),
  68       version_flag(other.version_flag),
  69       sequence_number_length(other.sequence_number_length),
  70       versions(other.versions) {
  71 }
  72
  73 QuicPacketPublicHeader::~QuicPacketPublicHeader() {}
  74
  75 QuicPacketHeader::QuicPacketHeader()
  76     : fec_flag(false),
  77       entropy_flag(false),
  78       entropy_hash(0),
  79       packet_sequence_number(0),
  80       is_in_fec_group(NOT_IN_FEC_GROUP),
  81       fec_group(0) {
  82 }
  83
  84 QuicPacketHeader::QuicPacketHeader(const QuicPacketPublicHeader& header)
  85     : public_header(header),
  86       fec_flag(false),
  87       entropy_flag(false),
  88       entropy_hash(0),
  89       packet_sequence_number(0),
  90       is_in_fec_group(NOT_IN_FEC_GROUP),
  91       fec_group(0) {
  92 }
  93
  94 QuicPublicResetPacket::QuicPublicResetPacket()
  95     : nonce_proof(0),
  96       rejected_sequence_number(0) {}
  97
  98 QuicPublicResetPacket::QuicPublicResetPacket(
  99     const QuicPacketPublicHeader& header)
 100     : public_header(header),
 101       nonce_proof(0),
 102       rejected_sequence_number(0) {}
 103
 104 QuicStreamFrame::QuicStreamFrame()
 105     : stream_id(0),
 106       fin(false),
 107       offset(0),
 108       notifier(NULL) {}
 109
 110 QuicStreamFrame::QuicStreamFrame(const QuicStreamFrame& frame)
 111     : stream_id(frame.stream_id),
 112       fin(frame.fin),
 113       offset(frame.offset),
 114       data(frame.data),
 115       notifier(frame.notifier) {
 116 }
 117
 118 QuicStreamFrame::QuicStreamFrame(QuicStreamId stream_id,
 119                                  bool fin,
 120                                  QuicStreamOffset offset,
 121                                  IOVector data)
 122     : stream_id(stream_id),
 123       fin(fin),
 124       offset(offset),
 125       data(data),
 126       notifier(NULL) {
 127 }
 128
 129 string* QuicStreamFrame::GetDataAsString() const {
 130   string* data_string = new string();
 131   data_string->reserve(data.TotalBufferSize());
 132   for (size_t i = 0; i < data.Size(); ++i) {
 133     data_string->append(static_cast<char*>(data.iovec()[i].iov_base),
 134                         data.iovec()[i].iov_len);
 135   }
 136   DCHECK_EQ(data_string->size(), data.TotalBufferSize());
 137   return data_string;
 138 }
 139
 140 uint32 MakeQuicTag(char a, char b, char c, char d) {
 141   return static_cast<uint32>(a) |
 142          static_cast<uint32>(b) << 8 |
 143          static_cast<uint32>(c) << 16 |
 144          static_cast<uint32>(d) << 24;
 145 }
 146
 147 bool ContainsQuicTag(const QuicTagVector& tag_vector, QuicTag tag) {
 148   return std::find(tag_vector.begin(), tag_vector.end(),  tag)
 149       != tag_vector.end();
 150 }
 151
 152 QuicVersionVector QuicSupportedVersions() {
 153   QuicVersionVector supported_versions;
 154   for (size_t i = 0; i < arraysize(kSupportedQuicVersions); ++i) {
 155     supported_versions.push_back(kSupportedQuicVersions[i]);
 156   }
 157   return supported_versions;
 158 }
 159
 160 QuicTag QuicVersionToQuicTag(const QuicVersion version) {
 161   switch (version) {
 162     case QUIC_VERSION_16:
 163       return MakeQuicTag('Q', '0', '1', '6');
 164     case QUIC_VERSION_18:
 165       return MakeQuicTag('Q', '0', '1', '8');
 166     case QUIC_VERSION_19:
 167       return MakeQuicTag('Q', '0', '1', '9');
 168     case QUIC_VERSION_21:
 169       return MakeQuicTag('Q', '0', '2', '1');
 170     case QUIC_VERSION_22:
 171       return MakeQuicTag('Q', '0', '2', '2');
 172     case QUIC_VERSION_23:
 173       return MakeQuicTag('Q', '0', '2', '3');
 174     default:
 175       // This shold be an ERROR because we should never attempt to convert an
 176       // invalid QuicVersion to be written to the wire.
 177       LOG(ERROR) << "Unsupported QuicVersion: " << version;
 178       return 0;
 179   }
 180 }
 181
 182 QuicVersion QuicTagToQuicVersion(const QuicTag version_tag) {
 183   for (size_t i = 0; i < arraysize(kSupportedQuicVersions); ++i) {
 184     if (version_tag == QuicVersionToQuicTag(kSupportedQuicVersions[i])) {
 185       return kSupportedQuicVersions[i];
 186     }
 187   }
 188   // Reading from the client so this should not be considered an ERROR.
 189   DVLOG(1) << "Unsupported QuicTag version: "
 190            << QuicUtils::TagToString(version_tag);
 191   return QUIC_VERSION_UNSUPPORTED;
 192 }
 193
 194 #define RETURN_STRING_LITERAL(x) \
 195 case x: \
 196 return #x
 197
 198 string QuicVersionToString(const QuicVersion version) {
 199   switch (version) {
 200     RETURN_STRING_LITERAL(QUIC_VERSION_16);
 201     RETURN_STRING_LITERAL(QUIC_VERSION_18);
 202     RETURN_STRING_LITERAL(QUIC_VERSION_19);
 203     RETURN_STRING_LITERAL(QUIC_VERSION_21);
 204     RETURN_STRING_LITERAL(QUIC_VERSION_22);
 205     RETURN_STRING_LITERAL(QUIC_VERSION_23);
 206     default:
 207       return "QUIC_VERSION_UNSUPPORTED";
 208   }
 209 }
 210
 211 string QuicVersionVectorToString(const QuicVersionVector& versions) {
 212   string result = "";
 213   for (size_t i = 0; i < versions.size(); ++i) {
 214     if (i != 0) {
 215       result.append(",");
 216     }
 217     result.append(QuicVersionToString(versions[i]));
 218   }
 219   return result;
 220 }
 221
 222 ostream& operator<<(ostream& os, const QuicPacketHeader& header) {
 223   os << "{ connection_id: " << header.public_header.connection_id
 224      << ", connection_id_length:" << header.public_header.connection_id_length
 225      << ", sequence_number_length:"
 226      << header.public_header.sequence_number_length
 227      << ", reset_flag: " << header.public_header.reset_flag
 228      << ", version_flag: " << header.public_header.version_flag;
 229   if (header.public_header.version_flag) {
 230     os << " version: ";
 231     for (size_t i = 0; i < header.public_header.versions.size(); ++i) {
 232       os << header.public_header.versions[0] << " ";
 233     }
 234   }
 235   os << ", fec_flag: " << header.fec_flag
 236      << ", entropy_flag: " << header.entropy_flag
 237      << ", entropy hash: " << static_cast<int>(header.entropy_hash)
 238      << ", sequence_number: " << header.packet_sequence_number
 239      << ", is_in_fec_group:" << header.is_in_fec_group
 240      << ", fec_group: " << header.fec_group<< "}\n";
 241   return os;
 242 }
 243
 244 bool IsAwaitingPacket(const QuicAckFrame& ack_frame,
 245                       QuicPacketSequenceNumber sequence_number) {
 246   return sequence_number > ack_frame.largest_observed ||
 247       ContainsKey(ack_frame.missing_packets, sequence_number);
 248 }
 249
 250 void InsertMissingPacketsBetween(QuicAckFrame* ack_frame,
 251                                  QuicPacketSequenceNumber lower,
 252                                  QuicPacketSequenceNumber higher) {
 253   for (QuicPacketSequenceNumber i = lower; i < higher; ++i) {
 254     ack_frame->missing_packets.insert(i);
 255   }
 256 }
 257
 258 QuicStopWaitingFrame::QuicStopWaitingFrame()
 259     : entropy_hash(0),
 260       least_unacked(0) {
 261 }
 262
 263 QuicStopWaitingFrame::~QuicStopWaitingFrame() {}
 264
 265 QuicAckFrame::QuicAckFrame()
 266     : entropy_hash(0),
 267       largest_observed(0),
 268       delta_time_largest_observed(QuicTime::Delta::Infinite()),
 269       is_truncated(false) {}
 270
 271 QuicAckFrame::~QuicAckFrame() {}
 272
 273 CongestionFeedbackMessageTCP::CongestionFeedbackMessageTCP()
 274     : receive_window(0) {
 275 }
 276
 277 QuicCongestionFeedbackFrame::QuicCongestionFeedbackFrame() : type(kTCP) {}
 278
 279 QuicCongestionFeedbackFrame::~QuicCongestionFeedbackFrame() {}
 280
 281 QuicRstStreamErrorCode AdjustErrorForVersion(
 282     QuicRstStreamErrorCode error_code,
 283     QuicVersion version) {
 284   switch (error_code) {
 285     case QUIC_RST_FLOW_CONTROL_ACCOUNTING:
 286       if (version < QUIC_VERSION_18) {
 287         return QUIC_STREAM_NO_ERROR;
 288       }
 289       break;
 290     default:
 291       return error_code;
 292   }
 293   return error_code;
 294 }
 295
 296 QuicRstStreamFrame::QuicRstStreamFrame()
 297     : stream_id(0),
 298       error_code(QUIC_STREAM_NO_ERROR) {
 299 }
 300
 301 QuicRstStreamFrame::QuicRstStreamFrame(QuicStreamId stream_id,
 302                                        QuicRstStreamErrorCode error_code,
 303                                        QuicStreamOffset bytes_written)
 304     : stream_id(stream_id),
 305       error_code(error_code),
 306       byte_offset(bytes_written) {
 307   DCHECK_LE(error_code, numeric_limits<uint8>::max());
 308 }
 309
 310 QuicConnectionCloseFrame::QuicConnectionCloseFrame()
 311     : error_code(QUIC_NO_ERROR) {
 312 }
 313
 314 QuicFrame::QuicFrame() {}
 315
 316 QuicFrame::QuicFrame(QuicPaddingFrame* padding_frame)
 317     : type(PADDING_FRAME),
 318       padding_frame(padding_frame) {
 319 }
 320
 321 QuicFrame::QuicFrame(QuicStreamFrame* stream_frame)
 322     : type(STREAM_FRAME),
 323       stream_frame(stream_frame) {
 324 }
 325
 326 QuicFrame::QuicFrame(QuicAckFrame* frame)
 327     : type(ACK_FRAME),
 328       ack_frame(frame) {
 329 }
 330
 331 QuicFrame::QuicFrame(QuicCongestionFeedbackFrame* frame)
 332     : type(CONGESTION_FEEDBACK_FRAME),
 333       congestion_feedback_frame(frame) {
 334 }
 335
 336 QuicFrame::QuicFrame(QuicStopWaitingFrame* frame)
 337     : type(STOP_WAITING_FRAME),
 338       stop_waiting_frame(frame) {
 339 }
 340
 341 QuicFrame::QuicFrame(QuicPingFrame* frame)
 342     : type(PING_FRAME),
 343       ping_frame(frame) {
 344 }
 345
 346 QuicFrame::QuicFrame(QuicRstStreamFrame* frame)
 347     : type(RST_STREAM_FRAME),
 348       rst_stream_frame(frame) {
 349 }
 350
 351 QuicFrame::QuicFrame(QuicConnectionCloseFrame* frame)
 352     : type(CONNECTION_CLOSE_FRAME),
 353       connection_close_frame(frame) {
 354 }
 355
 356 QuicFrame::QuicFrame(QuicGoAwayFrame* frame)
 357     : type(GOAWAY_FRAME),
 358       goaway_frame(frame) {
 359 }
 360
 361 QuicFrame::QuicFrame(QuicWindowUpdateFrame* frame)
 362     : type(WINDOW_UPDATE_FRAME),
 363       window_update_frame(frame) {
 364 }
 365
 366 QuicFrame::QuicFrame(QuicBlockedFrame* frame)
 367     : type(BLOCKED_FRAME),
 368       blocked_frame(frame) {
 369 }
 370
 371 QuicFecData::QuicFecData() : fec_group(0) {}
 372
 373 ostream& operator<<(ostream& os, const QuicStopWaitingFrame& sent_info) {
 374   os << "entropy_hash: " << static_cast<int>(sent_info.entropy_hash)
 375      << " least_unacked: " << sent_info.least_unacked;
 376   return os;
 377 }
 378
 379 ostream& operator<<(ostream& os, const QuicAckFrame& ack_frame) {
 380   os << "entropy_hash: " << static_cast<int>(ack_frame.entropy_hash)
 381      << " largest_observed: " << ack_frame.largest_observed
 382      << " delta_time_largest_observed: "
 383      << ack_frame.delta_time_largest_observed.ToMicroseconds()
 384      << " missing_packets: [ ";
 385   for (SequenceNumberSet::const_iterator it = ack_frame.missing_packets.begin();
 386        it != ack_frame.missing_packets.end(); ++it) {
 387     os << *it << " ";
 388   }
 389   os << " ] is_truncated: " << ack_frame.is_truncated;
 390   os << " revived_packets: [ ";
 391   for (SequenceNumberSet::const_iterator it = ack_frame.revived_packets.begin();
 392        it != ack_frame.revived_packets.end(); ++it) {
 393     os << *it << " ";
 394   }
 395   os << " ] received_packets: [ ";
 396   for (PacketTimeList::const_iterator it =
 397            ack_frame.received_packet_times.begin();
 398            it != ack_frame.received_packet_times.end(); ++it) {
 399     os << it->first << " at " << it->second.ToDebuggingValue() << " ";
 400   }
 401   os << " ]";
 402   return os;
 403 }
 404
 405 ostream& operator<<(ostream& os, const QuicFrame& frame) {
 406   switch (frame.type) {
 407   case PADDING_FRAME: {
 408       os << "type { PADDING_FRAME } ";
 409       break;
 410     }
 411     case RST_STREAM_FRAME: {
 412       os << "type { " << RST_STREAM_FRAME << " } " << *(frame.rst_stream_frame);
 413       break;
 414     }
 415     case CONNECTION_CLOSE_FRAME: {
 416       os << "type { CONNECTION_CLOSE_FRAME } "
 417          << *(frame.connection_close_frame);
 418       break;
 419     }
 420     case GOAWAY_FRAME: {
 421       os << "type { GOAWAY_FRAME } " << *(frame.goaway_frame);
 422       break;
 423     }
 424     case WINDOW_UPDATE_FRAME: {
 425       os << "type { WINDOW_UPDATE_FRAME } " << *(frame.window_update_frame);
 426       break;
 427     }
 428     case BLOCKED_FRAME: {
 429       os << "type { BLOCKED_FRAME } " << *(frame.blocked_frame);
 430       break;
 431     }
 432     case STREAM_FRAME: {
 433       os << "type { STREAM_FRAME } " << *(frame.stream_frame);
 434       break;
 435     }
 436     case ACK_FRAME: {
 437       os << "type { ACK_FRAME } " << *(frame.ack_frame);
 438       break;
 439     }
 440     case CONGESTION_FEEDBACK_FRAME: {
 441       os << "type { CONGESTION_FEEDBACK_FRAME } "
 442          << *(frame.congestion_feedback_frame);
 443       break;
 444     }
 445     case STOP_WAITING_FRAME: {
 446       os << "type { STOP_WAITING_FRAME } " << *(frame.stop_waiting_frame);
 447       break;
 448     }
 449     case PING_FRAME: {
 450       os << "type { PING_FRAME } ";
 451       break;
 452     }
 453     default: {
 454       LOG(ERROR) << "Unknown frame type: " << frame.type;
 455       break;
 456     }
 457   }
 458   return os;
 459 }
 460
 461 ostream& operator<<(ostream& os, const QuicRstStreamFrame& rst_frame) {
 462   os << "stream_id { " << rst_frame.stream_id << " } "
 463      << "error_code { " << rst_frame.error_code << " } "
 464      << "error_details { " << rst_frame.error_details << " }\n";
 465   return os;
 466 }
 467
 468 ostream& operator<<(ostream& os,
 469                     const QuicConnectionCloseFrame& connection_close_frame) {
 470   os << "error_code { " << connection_close_frame.error_code << " } "
 471      << "error_details { " << connection_close_frame.error_details << " }\n";
 472   return os;
 473 }
 474
 475 ostream& operator<<(ostream& os, const QuicGoAwayFrame& goaway_frame) {
 476   os << "error_code { " << goaway_frame.error_code << " } "
 477      << "last_good_stream_id { " << goaway_frame.last_good_stream_id << " } "
 478      << "reason_phrase { " << goaway_frame.reason_phrase << " }\n";
 479   return os;
 480 }
 481
 482 ostream& operator<<(ostream& os,
 483                     const QuicWindowUpdateFrame& window_update_frame) {
 484   os << "stream_id { " << window_update_frame.stream_id << " } "
 485      << "byte_offset { " << window_update_frame.byte_offset << " }\n";
 486   return os;
 487 }
 488
 489 ostream& operator<<(ostream& os, const QuicBlockedFrame& blocked_frame) {
 490   os << "stream_id { " << blocked_frame.stream_id << " }\n";
 491   return os;
 492 }
 493
 494 ostream& operator<<(ostream& os, const QuicStreamFrame& stream_frame) {
 495   os << "stream_id { " << stream_frame.stream_id << " } "
 496      << "fin { " << stream_frame.fin << " } "
 497      << "offset { " << stream_frame.offset << " } "
 498      << "data { "
 499      << QuicUtils::StringToHexASCIIDump(*(stream_frame.GetDataAsString()))
 500      << " }\n";
 501   return os;
 502 }
 503
 504 ostream& operator<<(ostream& os,
 505                     const QuicCongestionFeedbackFrame& congestion_frame) {
 506   os << "type: " << congestion_frame.type;
 507   switch (congestion_frame.type) {
 508     case kTCP: {
 509       const CongestionFeedbackMessageTCP& tcp = congestion_frame.tcp;
 510       os << " receive_window: " << tcp.receive_window;
 511       break;
 512     }
 513   }
 514   return os;
 515 }
 516
 517 QuicGoAwayFrame::QuicGoAwayFrame()
 518     : error_code(QUIC_NO_ERROR),
 519       last_good_stream_id(0) {
 520 }
 521
 522 QuicGoAwayFrame::QuicGoAwayFrame(QuicErrorCode error_code,
 523                                  QuicStreamId last_good_stream_id,
 524                                  const string& reason)
 525     : error_code(error_code),
 526       last_good_stream_id(last_good_stream_id),
 527       reason_phrase(reason) {
 528   DCHECK_LE(error_code, numeric_limits<uint8>::max());
 529 }
 530
 531 QuicData::QuicData(const char* buffer,
 532                    size_t length)
 533     : buffer_(buffer),
 534       length_(length),
 535       owns_buffer_(false) {
 536 }
 537
 538 QuicData::QuicData(char* buffer,
 539                    size_t length,
 540                    bool owns_buffer)
 541     : buffer_(buffer),
 542       length_(length),
 543       owns_buffer_(owns_buffer) {
 544 }
 545
 546 QuicData::~QuicData() {
 547   if (owns_buffer_) {
 548     delete [] const_cast<char*>(buffer_);
 549   }
 550 }
 551
 552 QuicWindowUpdateFrame::QuicWindowUpdateFrame(QuicStreamId stream_id,
 553                                              QuicStreamOffset byte_offset)
 554     : stream_id(stream_id),
 555       byte_offset(byte_offset) {}
 556
 557 QuicBlockedFrame::QuicBlockedFrame(QuicStreamId stream_id)
 558     : stream_id(stream_id) {}
 559
 560 QuicPacket::QuicPacket(char* buffer,
 561                        size_t length,
 562                        bool owns_buffer,
 563                        QuicConnectionIdLength connection_id_length,
 564                        bool includes_version,
 565                        QuicSequenceNumberLength sequence_number_length,
 566                        bool is_fec_packet)
 567     : QuicData(buffer, length, owns_buffer),
 568       buffer_(buffer),
 569       is_fec_packet_(is_fec_packet),
 570       connection_id_length_(connection_id_length),
 571       includes_version_(includes_version),
 572       sequence_number_length_(sequence_number_length) {
 573 }
 574
 575 QuicEncryptedPacket::QuicEncryptedPacket(const char* buffer,
 576                                          size_t length)
 577     : QuicData(buffer, length) {
 578 }
 579
 580 QuicEncryptedPacket::QuicEncryptedPacket(char* buffer,
 581                                          size_t length,
 582                                          bool owns_buffer)
 583       : QuicData(buffer, length, owns_buffer) {
 584 }
 585
 586 StringPiece QuicPacket::FecProtectedData() const {
 587   const size_t start_of_fec = GetStartOfFecProtectedData(
 588       connection_id_length_, includes_version_, sequence_number_length_);
 589   return StringPiece(data() + start_of_fec, length() - start_of_fec);
 590 }
 591
 592 StringPiece QuicPacket::AssociatedData() const {
 593   return StringPiece(
 594       data() + kStartOfHashData,
 595       GetStartOfEncryptedData(
 596           connection_id_length_, includes_version_, sequence_number_length_) -
 597       kStartOfHashData);
 598 }
 599
 600 StringPiece QuicPacket::BeforePlaintext() const {
 601   return StringPiece(data(), GetStartOfEncryptedData(connection_id_length_,
 602                                                      includes_version_,
 603                                                      sequence_number_length_));
 604 }
 605
 606 StringPiece QuicPacket::Plaintext() const {
 607   const size_t start_of_encrypted_data =
 608       GetStartOfEncryptedData(
 609           connection_id_length_, includes_version_, sequence_number_length_);
 610   return StringPiece(data() + start_of_encrypted_data,
 611                      length() - start_of_encrypted_data);
 612 }
 613
 614 RetransmittableFrames::RetransmittableFrames()
 615     : encryption_level_(NUM_ENCRYPTION_LEVELS),
 616       has_crypto_handshake_(NOT_HANDSHAKE) {
 617 }
 618
 619 RetransmittableFrames::~RetransmittableFrames() {
 620   for (QuicFrames::iterator it = frames_.begin(); it != frames_.end(); ++it) {
 621     switch (it->type) {
 622       case PADDING_FRAME:
 623         delete it->padding_frame;
 624         break;
 625       case STREAM_FRAME:
 626         delete it->stream_frame;
 627         break;
 628       case ACK_FRAME:
 629         delete it->ack_frame;
 630         break;
 631       case CONGESTION_FEEDBACK_FRAME:
 632         delete it->congestion_feedback_frame;
 633         break;
 634       case STOP_WAITING_FRAME:
 635         delete it->stop_waiting_frame;
 636         break;
 637       case PING_FRAME:
 638         delete it->ping_frame;
 639         break;
 640       case RST_STREAM_FRAME:
 641         delete it->rst_stream_frame;
 642         break;
 643       case CONNECTION_CLOSE_FRAME:
 644         delete it->connection_close_frame;
 645         break;
 646       case GOAWAY_FRAME:
 647         delete it->goaway_frame;
 648         break;
 649       case WINDOW_UPDATE_FRAME:
 650         delete it->window_update_frame;
 651         break;
 652       case BLOCKED_FRAME:
 653         delete it->blocked_frame;
 654         break;
 655       case NUM_FRAME_TYPES:
 656         DCHECK(false) << "Cannot delete type: " << it->type;
 657     }
 658   }
 659   STLDeleteElements(&stream_data_);
 660 }
 661
 662 const QuicFrame& RetransmittableFrames::AddStreamFrame(
 663     QuicStreamFrame* stream_frame) {
 664   // Make an owned copy of the stream frame's data.
 665   stream_data_.push_back(stream_frame->GetDataAsString());
 666   // Ensure the stream frame's IOVector points to the owned copy of the data.
 667   stream_frame->data.Clear();
 668   stream_frame->data.Append(const_cast<char*>(stream_data_.back()->data()),
 669                             stream_data_.back()->size());
 670   frames_.push_back(QuicFrame(stream_frame));
 671   if (stream_frame->stream_id == kCryptoStreamId) {
 672     has_crypto_handshake_ = IS_HANDSHAKE;
 673   }
 674   return frames_.back();
 675 }
 676
 677 const QuicFrame& RetransmittableFrames::AddNonStreamFrame(
 678     const QuicFrame& frame) {
 679   DCHECK_NE(frame.type, STREAM_FRAME);
 680   frames_.push_back(frame);
 681   return frames_.back();
 682 }
 683
 684 void RetransmittableFrames::set_encryption_level(EncryptionLevel level) {
 685   encryption_level_ = level;
 686 }
 687
 688 SerializedPacket::SerializedPacket(
 689     QuicPacketSequenceNumber sequence_number,
 690     QuicSequenceNumberLength sequence_number_length,
 691     QuicPacket* packet,
 692     QuicPacketEntropyHash entropy_hash,
 693     RetransmittableFrames* retransmittable_frames)
 694     : sequence_number(sequence_number),
 695       sequence_number_length(sequence_number_length),
 696       packet(packet),
 697       entropy_hash(entropy_hash),
 698       retransmittable_frames(retransmittable_frames) {
 699 }
 700
 701 SerializedPacket::~SerializedPacket() {}
 702
 703 QuicEncryptedPacket* QuicEncryptedPacket::Clone() const {
 704   char* buffer = new char[this->length()];
 705   memcpy(buffer, this->data(), this->length());
 706   return new QuicEncryptedPacket(buffer, this->length(), true);
 707 }
 708
 709 ostream& operator<<(ostream& os, const QuicEncryptedPacket& s) {
 710   os << s.length() << "-byte data";
 711   return os;
 712 }
 713
 714 TransmissionInfo::TransmissionInfo()
 715     : retransmittable_frames(NULL),
 716       sequence_number_length(PACKET_1BYTE_SEQUENCE_NUMBER),
 717       sent_time(QuicTime::Zero()),
 718       bytes_sent(0),
 719       nack_count(0),
 720       transmission_type(NOT_RETRANSMISSION),
 721       all_transmissions(NULL),
 722       in_flight(false),
 723       is_unackable(false) {}
 724
 725 TransmissionInfo::TransmissionInfo(
 726     RetransmittableFrames* retransmittable_frames,
 727     QuicSequenceNumberLength sequence_number_length)
 728     : retransmittable_frames(retransmittable_frames),
 729       sequence_number_length(sequence_number_length),
 730       sent_time(QuicTime::Zero()),
 731       bytes_sent(0),
 732       nack_count(0),
 733       transmission_type(NOT_RETRANSMISSION),
 734       all_transmissions(NULL),
 735       in_flight(false),
 736       is_unackable(false) {}
 737
 738 TransmissionInfo::TransmissionInfo(
 739     RetransmittableFrames* retransmittable_frames,
 740     QuicSequenceNumberLength sequence_number_length,
 741     TransmissionType transmission_type,
 742     SequenceNumberList* all_transmissions)
 743     : retransmittable_frames(retransmittable_frames),
 744       sequence_number_length(sequence_number_length),
 745       sent_time(QuicTime::Zero()),
 746       bytes_sent(0),
 747       nack_count(0),
 748       transmission_type(transmission_type),
 749       all_transmissions(all_transmissions),
 750       in_flight(false),
 751       is_unackable(false) {}
 752
 753 }  // namespace net