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_15:
 163       return MakeQuicTag('Q', '0', '1', '5');
 164     case QUIC_VERSION_16:
 165       return MakeQuicTag('Q', '0', '1', '6');
 166     case QUIC_VERSION_18:
 167       return MakeQuicTag('Q', '0', '1', '8');
 168     case QUIC_VERSION_19:
 169       return MakeQuicTag('Q', '0', '1', '9');
 170     case QUIC_VERSION_20:
 171       return MakeQuicTag('Q', '0', '2', '0');
 172     case QUIC_VERSION_21:
 173       return MakeQuicTag('Q', '0', '2', '1');
 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_15);
 201     RETURN_STRING_LITERAL(QUIC_VERSION_16);
 202     RETURN_STRING_LITERAL(QUIC_VERSION_18);
 203     RETURN_STRING_LITERAL(QUIC_VERSION_19);
 204     RETURN_STRING_LITERAL(QUIC_VERSION_20);
 205     RETURN_STRING_LITERAL(QUIC_VERSION_21);
 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 ReceivedPacketInfo::ReceivedPacketInfo()
 245     : entropy_hash(0),
 246       largest_observed(0),
 247       delta_time_largest_observed(QuicTime::Delta::Infinite()),
 248       is_truncated(false) {}
 249
 250 ReceivedPacketInfo::~ReceivedPacketInfo() {}
 251
 252 bool IsAwaitingPacket(const ReceivedPacketInfo& received_info,
 253                       QuicPacketSequenceNumber sequence_number) {
 254   return sequence_number > received_info.largest_observed ||
 255       ContainsKey(received_info.missing_packets, sequence_number);
 256 }
 257
 258 void InsertMissingPacketsBetween(ReceivedPacketInfo* received_info,
 259                                  QuicPacketSequenceNumber lower,
 260                                  QuicPacketSequenceNumber higher) {
 261   for (QuicPacketSequenceNumber i = lower; i < higher; ++i) {
 262     received_info->missing_packets.insert(i);
 263   }
 264 }
 265
 266 QuicStopWaitingFrame::QuicStopWaitingFrame()
 267     : entropy_hash(0),
 268       least_unacked(0) {
 269 }
 270
 271 QuicStopWaitingFrame::~QuicStopWaitingFrame() {}
 272
 273 QuicAckFrame::QuicAckFrame() {}
 274
 275 CongestionFeedbackMessageTCP::CongestionFeedbackMessageTCP()
 276     : receive_window(0) {
 277 }
 278
 279 CongestionFeedbackMessageInterArrival::CongestionFeedbackMessageInterArrival() {
 280 }
 281
 282 CongestionFeedbackMessageInterArrival::
 283     ~CongestionFeedbackMessageInterArrival() {}
 284
 285 QuicCongestionFeedbackFrame::QuicCongestionFeedbackFrame() : type(kTCP) {}
 286
 287 QuicCongestionFeedbackFrame::~QuicCongestionFeedbackFrame() {}
 288
 289 QuicRstStreamErrorCode AdjustErrorForVersion(
 290     QuicRstStreamErrorCode error_code,
 291     QuicVersion version) {
 292   switch (error_code) {
 293     case QUIC_RST_FLOW_CONTROL_ACCOUNTING:
 294       if (version < QUIC_VERSION_18) {
 295         return QUIC_STREAM_NO_ERROR;
 296       }
 297       break;
 298     default:
 299       return error_code;
 300   }
 301   return error_code;
 302 }
 303
 304 QuicRstStreamFrame::QuicRstStreamFrame()
 305     : stream_id(0),
 306       error_code(QUIC_STREAM_NO_ERROR) {
 307 }
 308
 309 QuicRstStreamFrame::QuicRstStreamFrame(QuicStreamId stream_id,
 310                                        QuicRstStreamErrorCode error_code,
 311                                        QuicStreamOffset bytes_written)
 312     : stream_id(stream_id),
 313       error_code(error_code),
 314       byte_offset(bytes_written) {
 315   DCHECK_LE(error_code, numeric_limits<uint8>::max());
 316 }
 317
 318 QuicConnectionCloseFrame::QuicConnectionCloseFrame()
 319     : error_code(QUIC_NO_ERROR) {
 320 }
 321
 322 QuicFrame::QuicFrame() {}
 323
 324 QuicFrame::QuicFrame(QuicPaddingFrame* padding_frame)
 325     : type(PADDING_FRAME),
 326       padding_frame(padding_frame) {
 327 }
 328
 329 QuicFrame::QuicFrame(QuicStreamFrame* stream_frame)
 330     : type(STREAM_FRAME),
 331       stream_frame(stream_frame) {
 332 }
 333
 334 QuicFrame::QuicFrame(QuicAckFrame* frame)
 335     : type(ACK_FRAME),
 336       ack_frame(frame) {
 337 }
 338
 339 QuicFrame::QuicFrame(QuicCongestionFeedbackFrame* frame)
 340     : type(CONGESTION_FEEDBACK_FRAME),
 341       congestion_feedback_frame(frame) {
 342 }
 343
 344 QuicFrame::QuicFrame(QuicStopWaitingFrame* frame)
 345     : type(STOP_WAITING_FRAME),
 346       stop_waiting_frame(frame) {
 347 }
 348
 349 QuicFrame::QuicFrame(QuicPingFrame* frame)
 350     : type(PING_FRAME),
 351       ping_frame(frame) {
 352 }
 353
 354 QuicFrame::QuicFrame(QuicRstStreamFrame* frame)
 355     : type(RST_STREAM_FRAME),
 356       rst_stream_frame(frame) {
 357 }
 358
 359 QuicFrame::QuicFrame(QuicConnectionCloseFrame* frame)
 360     : type(CONNECTION_CLOSE_FRAME),
 361       connection_close_frame(frame) {
 362 }
 363
 364 QuicFrame::QuicFrame(QuicGoAwayFrame* frame)
 365     : type(GOAWAY_FRAME),
 366       goaway_frame(frame) {
 367 }
 368
 369 QuicFrame::QuicFrame(QuicWindowUpdateFrame* frame)
 370     : type(WINDOW_UPDATE_FRAME),
 371       window_update_frame(frame) {
 372 }
 373
 374 QuicFrame::QuicFrame(QuicBlockedFrame* frame)
 375     : type(BLOCKED_FRAME),
 376       blocked_frame(frame) {
 377 }
 378
 379 QuicFecData::QuicFecData() : fec_group(0) {}
 380
 381 ostream& operator<<(ostream& os, const QuicStopWaitingFrame& sent_info) {
 382   os << "entropy_hash: " << static_cast<int>(sent_info.entropy_hash)
 383      << " least_unacked: " << sent_info.least_unacked;
 384   return os;
 385 }
 386
 387 ostream& operator<<(ostream& os, const ReceivedPacketInfo& received_info) {
 388   os << "entropy_hash: " << static_cast<int>(received_info.entropy_hash)
 389      << " is_truncated: " << received_info.is_truncated
 390      << " largest_observed: " << received_info.largest_observed
 391      << " delta_time_largest_observed: "
 392      << received_info.delta_time_largest_observed.ToMicroseconds()
 393      << " missing_packets: [ ";
 394   for (SequenceNumberSet::const_iterator it =
 395            received_info.missing_packets.begin();
 396        it != received_info.missing_packets.end(); ++it) {
 397     os << *it << " ";
 398   }
 399   os << " ] revived_packets: [ ";
 400   for (SequenceNumberSet::const_iterator it =
 401            received_info.revived_packets.begin();
 402        it != received_info.revived_packets.end(); ++it) {
 403     os << *it << " ";
 404   }
 405   os << " ]";
 406   return os;
 407 }
 408
 409 ostream& operator<<(ostream& os, const QuicFrame& frame) {
 410   switch (frame.type) {
 411   case PADDING_FRAME: {
 412       os << "type { PADDING_FRAME } ";
 413       break;
 414     }
 415     case RST_STREAM_FRAME: {
 416       os << "type { " << RST_STREAM_FRAME << " } " << *(frame.rst_stream_frame);
 417       break;
 418     }
 419     case CONNECTION_CLOSE_FRAME: {
 420       os << "type { CONNECTION_CLOSE_FRAME } "
 421          << *(frame.connection_close_frame);
 422       break;
 423     }
 424     case GOAWAY_FRAME: {
 425       os << "type { GOAWAY_FRAME } " << *(frame.goaway_frame);
 426       break;
 427     }
 428     case WINDOW_UPDATE_FRAME: {
 429       os << "type { WINDOW_UPDATE_FRAME } " << *(frame.window_update_frame);
 430       break;
 431     }
 432     case BLOCKED_FRAME: {
 433       os << "type { BLOCKED_FRAME } " << *(frame.blocked_frame);
 434       break;
 435     }
 436     case STREAM_FRAME: {
 437       os << "type { STREAM_FRAME } " << *(frame.stream_frame);
 438       break;
 439     }
 440     case ACK_FRAME: {
 441       os << "type { ACK_FRAME } " << *(frame.ack_frame);
 442       break;
 443     }
 444     case CONGESTION_FEEDBACK_FRAME: {
 445       os << "type { CONGESTION_FEEDBACK_FRAME } "
 446          << *(frame.congestion_feedback_frame);
 447       break;
 448     }
 449     case STOP_WAITING_FRAME: {
 450       os << "type { STOP_WAITING_FRAME } " << *(frame.stop_waiting_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, const QuicAckFrame& ack_frame) {
 505   os << "sent info { " << ack_frame.sent_info << " } "
 506      << "received info { " << ack_frame.received_info << " }\n";
 507   return os;
 508 }
 509
 510 ostream& operator<<(ostream& os,
 511                     const QuicCongestionFeedbackFrame& congestion_frame) {
 512   os << "type: " << congestion_frame.type;
 513   switch (congestion_frame.type) {
 514     case kInterArrival: {
 515       const CongestionFeedbackMessageInterArrival& inter_arrival =
 516           congestion_frame.inter_arrival;
 517       os << " received packets: [ ";
 518       for (TimeMap::const_iterator it =
 519                inter_arrival.received_packet_times.begin();
 520            it != inter_arrival.received_packet_times.end(); ++it) {
 521         os << it->first << "@" << it->second.ToDebuggingValue() << " ";
 522       }
 523       os << "]";
 524       break;
 525     }
 526     case kFixRate: {
 527       os << " bitrate_in_bytes_per_second: "
 528          << congestion_frame.fix_rate.bitrate.ToBytesPerSecond();
 529       break;
 530     }
 531     case kTCP: {
 532       const CongestionFeedbackMessageTCP& tcp = congestion_frame.tcp;
 533       os << " receive_window: " << tcp.receive_window;
 534       break;
 535     }
 536     case kTCPBBR: {
 537       LOG(DFATAL) << "TCPBBR is not yet supported.";
 538       break;
 539     }
 540   }
 541   return os;
 542 }
 543
 544 CongestionFeedbackMessageFixRate::CongestionFeedbackMessageFixRate()
 545     : bitrate(QuicBandwidth::Zero()) {
 546 }
 547
 548 QuicGoAwayFrame::QuicGoAwayFrame()
 549     : error_code(QUIC_NO_ERROR),
 550       last_good_stream_id(0) {
 551 }
 552
 553 QuicGoAwayFrame::QuicGoAwayFrame(QuicErrorCode error_code,
 554                                  QuicStreamId last_good_stream_id,
 555                                  const string& reason)
 556     : error_code(error_code),
 557       last_good_stream_id(last_good_stream_id),
 558       reason_phrase(reason) {
 559   DCHECK_LE(error_code, numeric_limits<uint8>::max());
 560 }
 561
 562 QuicData::QuicData(const char* buffer,
 563                    size_t length)
 564     : buffer_(buffer),
 565       length_(length),
 566       owns_buffer_(false) {
 567 }
 568
 569 QuicData::QuicData(char* buffer,
 570                    size_t length,
 571                    bool owns_buffer)
 572     : buffer_(buffer),
 573       length_(length),
 574       owns_buffer_(owns_buffer) {
 575 }
 576
 577 QuicData::~QuicData() {
 578   if (owns_buffer_) {
 579     delete [] const_cast<char*>(buffer_);
 580   }
 581 }
 582
 583 QuicWindowUpdateFrame::QuicWindowUpdateFrame(QuicStreamId stream_id,
 584                                              QuicStreamOffset byte_offset)
 585     : stream_id(stream_id),
 586       byte_offset(byte_offset) {}
 587
 588 QuicBlockedFrame::QuicBlockedFrame(QuicStreamId stream_id)
 589     : stream_id(stream_id) {}
 590
 591 QuicPacket::QuicPacket(char* buffer,
 592                        size_t length,
 593                        bool owns_buffer,
 594                        QuicConnectionIdLength connection_id_length,
 595                        bool includes_version,
 596                        QuicSequenceNumberLength sequence_number_length,
 597                        bool is_fec_packet)
 598     : QuicData(buffer, length, owns_buffer),
 599       buffer_(buffer),
 600       is_fec_packet_(is_fec_packet),
 601       connection_id_length_(connection_id_length),
 602       includes_version_(includes_version),
 603       sequence_number_length_(sequence_number_length) {
 604 }
 605
 606 QuicEncryptedPacket::QuicEncryptedPacket(const char* buffer,
 607                                          size_t length)
 608     : QuicData(buffer, length) {
 609 }
 610
 611 QuicEncryptedPacket::QuicEncryptedPacket(char* buffer,
 612                                          size_t length,
 613                                          bool owns_buffer)
 614       : QuicData(buffer, length, owns_buffer) {
 615 }
 616
 617 StringPiece QuicPacket::FecProtectedData() const {
 618   const size_t start_of_fec = GetStartOfFecProtectedData(
 619       connection_id_length_, includes_version_, sequence_number_length_);
 620   return StringPiece(data() + start_of_fec, length() - start_of_fec);
 621 }
 622
 623 StringPiece QuicPacket::AssociatedData() const {
 624   return StringPiece(
 625       data() + kStartOfHashData,
 626       GetStartOfEncryptedData(
 627           connection_id_length_, includes_version_, sequence_number_length_) -
 628       kStartOfHashData);
 629 }
 630
 631 StringPiece QuicPacket::BeforePlaintext() const {
 632   return StringPiece(data(), GetStartOfEncryptedData(connection_id_length_,
 633                                                      includes_version_,
 634                                                      sequence_number_length_));
 635 }
 636
 637 StringPiece QuicPacket::Plaintext() const {
 638   const size_t start_of_encrypted_data =
 639       GetStartOfEncryptedData(
 640           connection_id_length_, includes_version_, sequence_number_length_);
 641   return StringPiece(data() + start_of_encrypted_data,
 642                      length() - start_of_encrypted_data);
 643 }
 644
 645 RetransmittableFrames::RetransmittableFrames()
 646     : encryption_level_(NUM_ENCRYPTION_LEVELS) {
 647 }
 648
 649 RetransmittableFrames::~RetransmittableFrames() {
 650   for (QuicFrames::iterator it = frames_.begin(); it != frames_.end(); ++it) {
 651     switch (it->type) {
 652       case PADDING_FRAME:
 653         delete it->padding_frame;
 654         break;
 655       case STREAM_FRAME:
 656         delete it->stream_frame;
 657         break;
 658       case ACK_FRAME:
 659         delete it->ack_frame;
 660         break;
 661       case CONGESTION_FEEDBACK_FRAME:
 662         delete it->congestion_feedback_frame;
 663         break;
 664       case STOP_WAITING_FRAME:
 665         delete it->stop_waiting_frame;
 666         break;
 667       case PING_FRAME:
 668         delete it->ping_frame;
 669         break;
 670       case RST_STREAM_FRAME:
 671         delete it->rst_stream_frame;
 672         break;
 673       case CONNECTION_CLOSE_FRAME:
 674         delete it->connection_close_frame;
 675         break;
 676       case GOAWAY_FRAME:
 677         delete it->goaway_frame;
 678         break;
 679       case WINDOW_UPDATE_FRAME:
 680         delete it->window_update_frame;
 681         break;
 682       case BLOCKED_FRAME:
 683         delete it->blocked_frame;
 684         break;
 685       case NUM_FRAME_TYPES:
 686         DCHECK(false) << "Cannot delete type: " << it->type;
 687     }
 688   }
 689   STLDeleteElements(&stream_data_);
 690 }
 691
 692 const QuicFrame& RetransmittableFrames::AddStreamFrame(
 693     QuicStreamFrame* stream_frame) {
 694   // Make an owned copy of the stream frame's data.
 695   stream_data_.push_back(stream_frame->GetDataAsString());
 696   // Ensure the stream frame's IOVector points to the owned copy of the data.
 697   stream_frame->data.Clear();
 698   stream_frame->data.Append(const_cast<char*>(stream_data_.back()->data()),
 699                             stream_data_.back()->size());
 700   frames_.push_back(QuicFrame(stream_frame));
 701   return frames_.back();
 702 }
 703
 704 const QuicFrame& RetransmittableFrames::AddNonStreamFrame(
 705     const QuicFrame& frame) {
 706   DCHECK_NE(frame.type, STREAM_FRAME);
 707   frames_.push_back(frame);
 708   return frames_.back();
 709 }
 710
 711 IsHandshake RetransmittableFrames::HasCryptoHandshake() const {
 712   for (size_t i = 0; i < frames().size(); ++i) {
 713     if (frames()[i].type == STREAM_FRAME &&
 714         frames()[i].stream_frame->stream_id == kCryptoStreamId) {
 715       return IS_HANDSHAKE;
 716     }
 717   }
 718   return NOT_HANDSHAKE;
 719 }
 720
 721 void RetransmittableFrames::set_encryption_level(EncryptionLevel level) {
 722   encryption_level_ = level;
 723 }
 724
 725 SerializedPacket::SerializedPacket(
 726     QuicPacketSequenceNumber sequence_number,
 727     QuicSequenceNumberLength sequence_number_length,
 728     QuicPacket* packet,
 729     QuicPacketEntropyHash entropy_hash,
 730     RetransmittableFrames* retransmittable_frames)
 731     : sequence_number(sequence_number),
 732       sequence_number_length(sequence_number_length),
 733       packet(packet),
 734       entropy_hash(entropy_hash),
 735       retransmittable_frames(retransmittable_frames) {
 736 }
 737
 738 SerializedPacket::~SerializedPacket() {}
 739
 740 QuicEncryptedPacket* QuicEncryptedPacket::Clone() const {
 741   char* buffer = new char[this->length()];
 742   memcpy(buffer, this->data(), this->length());
 743   return new QuicEncryptedPacket(buffer, this->length(), true);
 744 }
 745
 746 ostream& operator<<(ostream& os, const QuicEncryptedPacket& s) {
 747   os << s.length() << "-byte data";
 748   return os;
 749 }
 750
 751 TransmissionInfo::TransmissionInfo()
 752     : retransmittable_frames(NULL),
 753       sequence_number_length(PACKET_1BYTE_SEQUENCE_NUMBER),
 754       sent_time(QuicTime::Zero()),
 755       bytes_sent(0),
 756       nack_count(0),
 757       transmission_type(NOT_RETRANSMISSION),
 758       all_transmissions(NULL),
 759       in_flight(false) {}
 760
 761 TransmissionInfo::TransmissionInfo(
 762     RetransmittableFrames* retransmittable_frames,
 763     QuicPacketSequenceNumber sequence_number,
 764     QuicSequenceNumberLength sequence_number_length)
 765     : retransmittable_frames(retransmittable_frames),
 766       sequence_number_length(sequence_number_length),
 767       sent_time(QuicTime::Zero()),
 768       bytes_sent(0),
 769       nack_count(0),
 770       transmission_type(NOT_RETRANSMISSION),
 771       all_transmissions(new SequenceNumberSet),
 772       in_flight(false) {
 773   all_transmissions->insert(sequence_number);
 774 }
 775
 776 TransmissionInfo::TransmissionInfo(
 777     RetransmittableFrames* retransmittable_frames,
 778     QuicPacketSequenceNumber sequence_number,
 779     QuicSequenceNumberLength sequence_number_length,
 780     TransmissionType transmission_type,
 781     SequenceNumberSet* all_transmissions)
 782     : retransmittable_frames(retransmittable_frames),
 783       sequence_number_length(sequence_number_length),
 784       sent_time(QuicTime::Zero()),
 785       bytes_sent(0),
 786       nack_count(0),
 787       transmission_type(transmission_type),
 788       all_transmissions(all_transmissions),
 789       in_flight(false) {
 790   all_transmissions->insert(sequence_number);
 791 }
 792
 793 }  // namespace net