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| 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_packet_creator.h" | |
| 6 | |
| 7 #include <algorithm> | |
| 8 | |
| 9 #include "base/logging.h" | |
| 10 #include "base/macros.h" | |
| 11 #include "net/quic/crypto/crypto_protocol.h" | |
| 12 #include "net/quic/crypto/quic_random.h" | |
| 13 #include "net/quic/quic_bug_tracker.h" | |
| 14 #include "net/quic/quic_data_writer.h" | |
| 15 #include "net/quic/quic_flags.h" | |
| 16 #include "net/quic/quic_utils.h" | |
| 17 | |
| 18 using base::StringPiece; | |
| 19 using std::make_pair; | |
| 20 using std::max; | |
| 21 using std::min; | |
| 22 using std::pair; | |
| 23 using std::string; | |
| 24 using std::vector; | |
| 25 | |
| 26 namespace net { | |
| 27 | |
| 28 QuicPacketCreator::QuicPacketCreator(QuicConnectionId connection_id, | |
| 29 QuicFramer* framer, | |
| 30 QuicRandom* random_generator, | |
| 31 QuicBufferAllocator* buffer_allocator, | |
| 32 DelegateInterface* delegate) | |
| 33 : delegate_(delegate), | |
| 34 debug_delegate_(nullptr), | |
| 35 framer_(framer), | |
| 36 random_bool_source_(random_generator), | |
| 37 buffer_allocator_(buffer_allocator), | |
| 38 send_version_in_packet_(framer->perspective() == Perspective::IS_CLIENT), | |
| 39 send_path_id_in_packet_(false), | |
| 40 next_packet_number_length_(PACKET_1BYTE_PACKET_NUMBER), | |
| 41 have_diversification_nonce_(false), | |
| 42 max_packet_length_(0), | |
| 43 connection_id_length_(PACKET_8BYTE_CONNECTION_ID), | |
| 44 packet_size_(0), | |
| 45 connection_id_(connection_id), | |
| 46 packet_(kDefaultPathId, | |
| 47 0, | |
| 48 PACKET_1BYTE_PACKET_NUMBER, | |
| 49 nullptr, | |
| 50 0, | |
| 51 0, | |
| 52 false, | |
| 53 false) { | |
| 54 SetMaxPacketLength(kDefaultMaxPacketSize); | |
| 55 } | |
| 56 | |
| 57 QuicPacketCreator::~QuicPacketCreator() { | |
| 58 QuicUtils::DeleteFrames(&packet_.retransmittable_frames); | |
| 59 } | |
| 60 | |
| 61 void QuicPacketCreator::SetEncrypter(EncryptionLevel level, | |
| 62 QuicEncrypter* encrypter) { | |
| 63 framer_->SetEncrypter(level, encrypter); | |
| 64 max_plaintext_size_ = framer_->GetMaxPlaintextSize(max_packet_length_); | |
| 65 } | |
| 66 | |
| 67 bool QuicPacketCreator::CanSetMaxPacketLength() const { | |
| 68 // |max_packet_length_| should not be changed mid-packet. | |
| 69 return queued_frames_.empty(); | |
| 70 } | |
| 71 | |
| 72 void QuicPacketCreator::SetMaxPacketLength(QuicByteCount length) { | |
| 73 DCHECK(CanSetMaxPacketLength()); | |
| 74 | |
| 75 // Avoid recomputing |max_plaintext_size_| if the length does not actually | |
| 76 // change. | |
| 77 if (length == max_packet_length_) { | |
| 78 return; | |
| 79 } | |
| 80 | |
| 81 max_packet_length_ = length; | |
| 82 max_plaintext_size_ = framer_->GetMaxPlaintextSize(max_packet_length_); | |
| 83 } | |
| 84 | |
| 85 void QuicPacketCreator::MaybeUpdatePacketNumberLength() { | |
| 86 DCHECK(!FLAGS_quic_simple_packet_number_length); | |
| 87 if (!queued_frames_.empty()) { | |
| 88 // Don't change creator state if there are frames queued. | |
| 89 return; | |
| 90 } | |
| 91 | |
| 92 // Update packet number length only on packet boundary. | |
| 93 packet_.packet_number_length = next_packet_number_length_; | |
| 94 } | |
| 95 | |
| 96 // Stops serializing version of the protocol in packets sent after this call. | |
| 97 // A packet that is already open might send kQuicVersionSize bytes less than the | |
| 98 // maximum packet size if we stop sending version before it is serialized. | |
| 99 void QuicPacketCreator::StopSendingVersion() { | |
| 100 DCHECK(send_version_in_packet_); | |
| 101 send_version_in_packet_ = false; | |
| 102 if (packet_size_ > 0) { | |
| 103 DCHECK_LT(kQuicVersionSize, packet_size_); | |
| 104 packet_size_ -= kQuicVersionSize; | |
| 105 } | |
| 106 } | |
| 107 | |
| 108 void QuicPacketCreator::SetDiversificationNonce( | |
| 109 const DiversificationNonce nonce) { | |
| 110 DCHECK(!have_diversification_nonce_); | |
| 111 have_diversification_nonce_ = true; | |
| 112 memcpy(&diversification_nonce_, nonce, sizeof(diversification_nonce_)); | |
| 113 } | |
| 114 | |
| 115 void QuicPacketCreator::UpdatePacketNumberLength( | |
| 116 QuicPacketNumber least_packet_awaited_by_peer, | |
| 117 QuicPacketCount max_packets_in_flight) { | |
| 118 if (FLAGS_quic_simple_packet_number_length && !queued_frames_.empty()) { | |
| 119 // Don't change creator state if there are frames queued. | |
| 120 QUIC_BUG << "Called UpdatePacketNumberLength with " << queued_frames_.size() | |
| 121 << " queued_frames. First frame type:" | |
| 122 << queued_frames_.front().type | |
| 123 << " last frame type:" << queued_frames_.back().type; | |
| 124 return; | |
| 125 } | |
| 126 | |
| 127 DCHECK_LE(least_packet_awaited_by_peer, packet_.packet_number + 1); | |
| 128 const QuicPacketNumber current_delta = | |
| 129 packet_.packet_number + 1 - least_packet_awaited_by_peer; | |
| 130 const uint64_t delta = max(current_delta, max_packets_in_flight); | |
| 131 if (FLAGS_quic_simple_packet_number_length) { | |
| 132 packet_.packet_number_length = | |
| 133 QuicFramer::GetMinSequenceNumberLength(delta * 4); | |
| 134 } else { | |
| 135 next_packet_number_length_ = | |
| 136 QuicFramer::GetMinSequenceNumberLength(delta * 4); | |
| 137 } | |
| 138 } | |
| 139 | |
| 140 bool QuicPacketCreator::ConsumeData(QuicStreamId id, | |
| 141 QuicIOVector iov, | |
| 142 size_t iov_offset, | |
| 143 QuicStreamOffset offset, | |
| 144 bool fin, | |
| 145 bool needs_full_padding, | |
| 146 QuicFrame* frame) { | |
| 147 if (!HasRoomForStreamFrame(id, offset)) { | |
| 148 return false; | |
| 149 } | |
| 150 CreateStreamFrame(id, iov, iov_offset, offset, fin, frame); | |
| 151 // Explicitly disallow multi-packet CHLOs. | |
| 152 if (id == kCryptoStreamId && | |
| 153 frame->stream_frame->data_length >= sizeof(kCHLO) && | |
| 154 strncmp(frame->stream_frame->data_buffer, | |
| 155 reinterpret_cast<const char*>(&kCHLO), sizeof(kCHLO)) == 0) { | |
| 156 DCHECK_EQ(static_cast<size_t>(0), iov_offset); | |
| 157 if (frame->stream_frame->data_length < iov.iov->iov_len) { | |
| 158 const string error_details = "Client hello won't fit in a single packet."; | |
| 159 QUIC_BUG << error_details << " Constructed stream frame length: " | |
| 160 << frame->stream_frame->data_length | |
| 161 << " CHLO length: " << iov.iov->iov_len; | |
| 162 delegate_->OnUnrecoverableError(QUIC_CRYPTO_CHLO_TOO_LARGE, error_details, | |
| 163 ConnectionCloseSource::FROM_SELF); | |
| 164 delete frame->stream_frame; | |
| 165 return false; | |
| 166 } | |
| 167 } | |
| 168 if (!AddFrame(*frame, /*save_retransmittable_frames=*/true)) { | |
| 169 // Fails if we try to write unencrypted stream data. | |
| 170 delete frame->stream_frame; | |
| 171 return false; | |
| 172 } | |
| 173 if (needs_full_padding) { | |
| 174 packet_.num_padding_bytes = -1; | |
| 175 } | |
| 176 return true; | |
| 177 } | |
| 178 | |
| 179 bool QuicPacketCreator::HasRoomForStreamFrame(QuicStreamId id, | |
| 180 QuicStreamOffset offset) { | |
| 181 return BytesFree() > QuicFramer::GetMinStreamFrameSize(id, offset, true); | |
| 182 } | |
| 183 | |
| 184 // static | |
| 185 size_t QuicPacketCreator::StreamFramePacketOverhead( | |
| 186 QuicVersion version, | |
| 187 QuicConnectionIdLength connection_id_length, | |
| 188 bool include_version, | |
| 189 bool include_path_id, | |
| 190 bool include_diversification_nonce, | |
| 191 QuicPacketNumberLength packet_number_length, | |
| 192 QuicStreamOffset offset) { | |
| 193 return GetPacketHeaderSize(version, connection_id_length, include_version, | |
| 194 include_path_id, include_diversification_nonce, | |
| 195 packet_number_length) + | |
| 196 // Assumes this is a stream with a single lone packet. | |
| 197 QuicFramer::GetMinStreamFrameSize(1u, offset, true); | |
| 198 } | |
| 199 | |
| 200 void QuicPacketCreator::CreateStreamFrame(QuicStreamId id, | |
| 201 QuicIOVector iov, | |
| 202 size_t iov_offset, | |
| 203 QuicStreamOffset offset, | |
| 204 bool fin, | |
| 205 QuicFrame* frame) { | |
| 206 DCHECK_GT(max_packet_length_, | |
| 207 StreamFramePacketOverhead(framer_->version(), connection_id_length_, | |
| 208 kIncludeVersion, kIncludePathId, | |
| 209 IncludeNonceInPublicHeader(), | |
| 210 PACKET_6BYTE_PACKET_NUMBER, offset)); | |
| 211 | |
| 212 if (!FLAGS_quic_simple_packet_number_length) { | |
| 213 MaybeUpdatePacketNumberLength(); | |
| 214 } | |
| 215 QUIC_BUG_IF(!HasRoomForStreamFrame(id, offset)) | |
| 216 << "No room for Stream frame, BytesFree: " << BytesFree() | |
| 217 << " MinStreamFrameSize: " | |
| 218 << QuicFramer::GetMinStreamFrameSize(id, offset, true); | |
| 219 | |
| 220 if (iov_offset == iov.total_length) { | |
| 221 QUIC_BUG_IF(!fin) << "Creating a stream frame with no data or fin."; | |
| 222 // Create a new packet for the fin, if necessary. | |
| 223 *frame = QuicFrame(new QuicStreamFrame(id, true, offset, StringPiece())); | |
| 224 return; | |
| 225 } | |
| 226 | |
| 227 const size_t data_size = iov.total_length - iov_offset; | |
| 228 size_t min_frame_size = QuicFramer::GetMinStreamFrameSize( | |
| 229 id, offset, /* last_frame_in_packet= */ true); | |
| 230 size_t bytes_consumed = min<size_t>(BytesFree() - min_frame_size, data_size); | |
| 231 | |
| 232 bool set_fin = fin && bytes_consumed == data_size; // Last frame. | |
| 233 UniqueStreamBuffer buffer = | |
| 234 NewStreamBuffer(buffer_allocator_, bytes_consumed); | |
| 235 CopyToBuffer(iov, iov_offset, bytes_consumed, buffer.get()); | |
| 236 *frame = QuicFrame(new QuicStreamFrame(id, set_fin, offset, bytes_consumed, | |
| 237 std::move(buffer))); | |
| 238 } | |
| 239 | |
| 240 // static | |
| 241 void QuicPacketCreator::CopyToBuffer(QuicIOVector iov, | |
| 242 size_t iov_offset, | |
| 243 size_t length, | |
| 244 char* buffer) { | |
| 245 int iovnum = 0; | |
| 246 while (iovnum < iov.iov_count && iov_offset >= iov.iov[iovnum].iov_len) { | |
| 247 iov_offset -= iov.iov[iovnum].iov_len; | |
| 248 ++iovnum; | |
| 249 } | |
| 250 DCHECK_LE(iovnum, iov.iov_count); | |
| 251 DCHECK_LE(iov_offset, iov.iov[iovnum].iov_len); | |
| 252 if (iovnum >= iov.iov_count || length == 0) { | |
| 253 return; | |
| 254 } | |
| 255 | |
| 256 // Unroll the first iteration that handles iov_offset. | |
| 257 const size_t iov_available = iov.iov[iovnum].iov_len - iov_offset; | |
| 258 size_t copy_len = min(length, iov_available); | |
| 259 | |
| 260 // Try to prefetch the next iov if there is at least one more after the | |
| 261 // current. Otherwise, it looks like an irregular access that the hardware | |
| 262 // prefetcher won't speculatively prefetch. Only prefetch one iov because | |
| 263 // generally, the iov_offset is not 0, input iov consists of 2K buffers and | |
| 264 // the output buffer is ~1.4K. | |
| 265 if (copy_len == iov_available && iovnum + 1 < iov.iov_count) { | |
| 266 // TODO(ckrasic) - this is unused without prefetch() | |
| 267 // char* next_base = static_cast<char*>(iov.iov[iovnum + 1].iov_base); | |
| 268 // char* next_base = static_cast<char*>(iov.iov[iovnum + 1].iov_base); | |
| 269 // Prefetch 2 cachelines worth of data to get the prefetcher started; leave | |
| 270 // it to the hardware prefetcher after that. | |
| 271 // TODO(ckrasic) - investigate what to do about prefetch directives. | |
| 272 // prefetch(next_base, PREFETCH_HINT_T0); | |
| 273 if (iov.iov[iovnum + 1].iov_len >= 64) { | |
| 274 // TODO(ckrasic) - investigate what to do about prefetch directives. | |
| 275 // prefetch(next_base + CACHELINE_SIZE, PREFETCH_HINT_T0); | |
| 276 } | |
| 277 } | |
| 278 | |
| 279 const char* src = static_cast<char*>(iov.iov[iovnum].iov_base) + iov_offset; | |
| 280 while (true) { | |
| 281 memcpy(buffer, src, copy_len); | |
| 282 length -= copy_len; | |
| 283 buffer += copy_len; | |
| 284 if (length == 0 || ++iovnum >= iov.iov_count) { | |
| 285 break; | |
| 286 } | |
| 287 src = static_cast<char*>(iov.iov[iovnum].iov_base); | |
| 288 copy_len = min(length, iov.iov[iovnum].iov_len); | |
| 289 } | |
| 290 QUIC_BUG_IF(length > 0) << "Failed to copy entire length to buffer."; | |
| 291 } | |
| 292 | |
| 293 void QuicPacketCreator::ReserializeAllFrames( | |
| 294 const PendingRetransmission& retransmission, | |
| 295 char* buffer, | |
| 296 size_t buffer_len) { | |
| 297 DCHECK(queued_frames_.empty()); | |
| 298 DCHECK_EQ(0, packet_.num_padding_bytes); | |
| 299 QUIC_BUG_IF(retransmission.retransmittable_frames.empty()) | |
| 300 << "Attempt to serialize empty packet"; | |
| 301 const QuicPacketNumberLength saved_length = packet_.packet_number_length; | |
| 302 const QuicPacketNumberLength saved_next_length = next_packet_number_length_; | |
| 303 const EncryptionLevel default_encryption_level = packet_.encryption_level; | |
| 304 | |
| 305 // Temporarily set the packet number length and change the encryption level. | |
| 306 packet_.packet_number_length = retransmission.packet_number_length; | |
| 307 if (!FLAGS_quic_simple_packet_number_length) { | |
| 308 next_packet_number_length_ = retransmission.packet_number_length; | |
| 309 } | |
| 310 packet_.num_padding_bytes = retransmission.num_padding_bytes; | |
| 311 // Only preserve the original encryption level if it's a handshake packet or | |
| 312 // if we haven't gone forward secure. | |
| 313 if (retransmission.has_crypto_handshake || | |
| 314 packet_.encryption_level != ENCRYPTION_FORWARD_SECURE) { | |
| 315 packet_.encryption_level = retransmission.encryption_level; | |
| 316 } | |
| 317 | |
| 318 // Serialize the packet and restore packet number length state. | |
| 319 for (const QuicFrame& frame : retransmission.retransmittable_frames) { | |
| 320 bool success = AddFrame(frame, false); | |
| 321 LOG_IF(DFATAL, !success) | |
| 322 << " Failed to add frame of type:" << frame.type | |
| 323 << " num_frames:" << retransmission.retransmittable_frames.size() | |
| 324 << " retransmission.packet_number_length:" | |
| 325 << retransmission.packet_number_length | |
| 326 << " packet_.packet_number_length:" << packet_.packet_number_length; | |
| 327 } | |
| 328 SerializePacket(buffer, buffer_len); | |
| 329 packet_.original_path_id = retransmission.path_id; | |
| 330 packet_.original_packet_number = retransmission.packet_number; | |
| 331 packet_.transmission_type = retransmission.transmission_type; | |
| 332 OnSerializedPacket(); | |
| 333 // Restore old values. | |
| 334 if (!FLAGS_quic_simple_packet_number_length) { | |
| 335 // OnSerializedPacket updates the packet_number_length, so it's incorrect to | |
| 336 // restore it here. | |
| 337 packet_.packet_number_length = saved_length; | |
| 338 next_packet_number_length_ = saved_next_length; | |
| 339 } | |
| 340 packet_.encryption_level = default_encryption_level; | |
| 341 } | |
| 342 | |
| 343 void QuicPacketCreator::Flush() { | |
| 344 if (!HasPendingFrames()) { | |
| 345 return; | |
| 346 } | |
| 347 | |
| 348 // TODO(rtenneti): Change the default 64 alignas value (used the default | |
| 349 // value from CACHELINE_SIZE). | |
| 350 ALIGNAS(64) char seralized_packet_buffer[kMaxPacketSize]; | |
| 351 SerializePacket(seralized_packet_buffer, kMaxPacketSize); | |
| 352 OnSerializedPacket(); | |
| 353 } | |
| 354 | |
| 355 void QuicPacketCreator::OnSerializedPacket() { | |
| 356 if (packet_.encrypted_buffer == nullptr) { | |
| 357 const string error_details = "Failed to SerializePacket."; | |
| 358 QUIC_BUG << error_details; | |
| 359 delegate_->OnUnrecoverableError(QUIC_FAILED_TO_SERIALIZE_PACKET, | |
| 360 error_details, | |
| 361 ConnectionCloseSource::FROM_SELF); | |
| 362 return; | |
| 363 } | |
| 364 | |
| 365 delegate_->OnSerializedPacket(&packet_); | |
| 366 ClearPacket(); | |
| 367 // Maximum packet size may be only enacted while no packet is currently being | |
| 368 // constructed, so here we have a good opportunity to actually change it. | |
| 369 if (CanSetMaxPacketLength()) { | |
| 370 SetMaxPacketLength(max_packet_length_); | |
| 371 } | |
| 372 } | |
| 373 | |
| 374 void QuicPacketCreator::ClearPacket() { | |
| 375 packet_.has_ack = false; | |
| 376 packet_.has_stop_waiting = false; | |
| 377 packet_.has_crypto_handshake = NOT_HANDSHAKE; | |
| 378 packet_.num_padding_bytes = 0; | |
| 379 packet_.original_path_id = kInvalidPathId; | |
| 380 packet_.original_packet_number = 0; | |
| 381 packet_.transmission_type = NOT_RETRANSMISSION; | |
| 382 packet_.encrypted_buffer = nullptr; | |
| 383 packet_.encrypted_length = 0; | |
| 384 DCHECK(packet_.retransmittable_frames.empty()); | |
| 385 packet_.listeners.clear(); | |
| 386 } | |
| 387 | |
| 388 void QuicPacketCreator::CreateAndSerializeStreamFrame( | |
| 389 QuicStreamId id, | |
| 390 const QuicIOVector& iov, | |
| 391 QuicStreamOffset iov_offset, | |
| 392 QuicStreamOffset stream_offset, | |
| 393 bool fin, | |
| 394 QuicAckListenerInterface* listener, | |
| 395 char* encrypted_buffer, | |
| 396 size_t encrypted_buffer_len, | |
| 397 size_t* num_bytes_consumed) { | |
| 398 DCHECK(queued_frames_.empty()); | |
| 399 // Write out the packet header | |
| 400 QuicPacketHeader header; | |
| 401 FillPacketHeader(&header); | |
| 402 QuicDataWriter writer(kMaxPacketSize, encrypted_buffer); | |
| 403 if (!framer_->AppendPacketHeader(header, &writer)) { | |
| 404 QUIC_BUG << "AppendPacketHeader failed"; | |
| 405 return; | |
| 406 } | |
| 407 | |
| 408 // Create a Stream frame with the remaining space. | |
| 409 QUIC_BUG_IF(iov_offset == iov.total_length && !fin) | |
| 410 << "Creating a stream frame with no data or fin."; | |
| 411 const size_t remaining_data_size = iov.total_length - iov_offset; | |
| 412 const size_t min_frame_size = QuicFramer::GetMinStreamFrameSize( | |
| 413 id, stream_offset, /* last_frame_in_packet= */ true); | |
| 414 const size_t available_size = | |
| 415 max_plaintext_size_ - writer.length() - min_frame_size; | |
| 416 const size_t bytes_consumed = | |
| 417 min<size_t>(available_size, remaining_data_size); | |
| 418 | |
| 419 const bool set_fin = fin && (bytes_consumed == remaining_data_size); | |
| 420 UniqueStreamBuffer stream_buffer = | |
| 421 NewStreamBuffer(buffer_allocator_, bytes_consumed); | |
| 422 CopyToBuffer(iov, iov_offset, bytes_consumed, stream_buffer.get()); | |
| 423 std::unique_ptr<QuicStreamFrame> frame(new QuicStreamFrame( | |
| 424 id, set_fin, stream_offset, bytes_consumed, std::move(stream_buffer))); | |
| 425 | |
| 426 // TODO(ianswett): AppendTypeByte and AppendStreamFrame could be optimized | |
| 427 // into one method that takes a QuicStreamFrame, if warranted. | |
| 428 if (!framer_->AppendTypeByte(QuicFrame(frame.get()), | |
| 429 /* no stream frame length */ true, &writer)) { | |
| 430 QUIC_BUG << "AppendTypeByte failed"; | |
| 431 return; | |
| 432 } | |
| 433 if (!framer_->AppendStreamFrame(*frame, /* no stream frame length */ true, | |
| 434 &writer)) { | |
| 435 QUIC_BUG << "AppendStreamFrame failed"; | |
| 436 return; | |
| 437 } | |
| 438 | |
| 439 size_t encrypted_length = framer_->EncryptInPlace( | |
| 440 packet_.encryption_level, packet_.path_id, packet_.packet_number, | |
| 441 GetStartOfEncryptedData(framer_->version(), header), writer.length(), | |
| 442 encrypted_buffer_len, encrypted_buffer); | |
| 443 if (encrypted_length == 0) { | |
| 444 QUIC_BUG << "Failed to encrypt packet number " << header.packet_number; | |
| 445 return; | |
| 446 } | |
| 447 // TODO(ianswett): Optimize the storage so RetransmitableFrames can be | |
| 448 // unioned with a QuicStreamFrame and a UniqueStreamBuffer. | |
| 449 *num_bytes_consumed = bytes_consumed; | |
| 450 packet_size_ = 0; | |
| 451 packet_.entropy_hash = QuicFramer::GetPacketEntropyHash(header); | |
| 452 packet_.encrypted_buffer = encrypted_buffer; | |
| 453 packet_.encrypted_length = encrypted_length; | |
| 454 if (listener != nullptr) { | |
| 455 packet_.listeners.emplace_back(listener, bytes_consumed); | |
| 456 } | |
| 457 packet_.retransmittable_frames.push_back(QuicFrame(frame.release())); | |
| 458 OnSerializedPacket(); | |
| 459 } | |
| 460 | |
| 461 bool QuicPacketCreator::HasPendingFrames() const { | |
| 462 return !queued_frames_.empty(); | |
| 463 } | |
| 464 | |
| 465 bool QuicPacketCreator::HasPendingRetransmittableFrames() const { | |
| 466 return !packet_.retransmittable_frames.empty(); | |
| 467 } | |
| 468 | |
| 469 size_t QuicPacketCreator::ExpansionOnNewFrame() const { | |
| 470 // If the last frame in the packet is a stream frame, then it will expand to | |
| 471 // include the stream_length field when a new frame is added. | |
| 472 bool has_trailing_stream_frame = | |
| 473 !queued_frames_.empty() && queued_frames_.back().type == STREAM_FRAME; | |
| 474 return has_trailing_stream_frame ? kQuicStreamPayloadLengthSize : 0; | |
| 475 } | |
| 476 | |
| 477 size_t QuicPacketCreator::BytesFree() { | |
| 478 DCHECK_GE(max_plaintext_size_, PacketSize()); | |
| 479 return max_plaintext_size_ - | |
| 480 min(max_plaintext_size_, PacketSize() + ExpansionOnNewFrame()); | |
| 481 } | |
| 482 | |
| 483 size_t QuicPacketCreator::PacketSize() { | |
| 484 if (!queued_frames_.empty()) { | |
| 485 return packet_size_; | |
| 486 } | |
| 487 // Update packet number length on packet boundary. | |
| 488 if (!FLAGS_quic_simple_packet_number_length) { | |
| 489 packet_.packet_number_length = next_packet_number_length_; | |
| 490 } | |
| 491 packet_size_ = GetPacketHeaderSize( | |
| 492 framer_->version(), connection_id_length_, send_version_in_packet_, | |
| 493 send_path_id_in_packet_, IncludeNonceInPublicHeader(), | |
| 494 packet_.packet_number_length); | |
| 495 return packet_size_; | |
| 496 } | |
| 497 | |
| 498 bool QuicPacketCreator::AddSavedFrame(const QuicFrame& frame) { | |
| 499 return AddFrame(frame, /*save_retransmittable_frames=*/true); | |
| 500 } | |
| 501 | |
| 502 bool QuicPacketCreator::AddPaddedSavedFrame(const QuicFrame& frame) { | |
| 503 if (AddFrame(frame, /*save_retransmittable_frames=*/true)) { | |
| 504 packet_.num_padding_bytes = -1; | |
| 505 return true; | |
| 506 } | |
| 507 return false; | |
| 508 } | |
| 509 | |
| 510 void QuicPacketCreator::AddAckListener(QuicAckListenerInterface* listener, | |
| 511 QuicPacketLength length) { | |
| 512 DCHECK(!queued_frames_.empty()); | |
| 513 packet_.listeners.emplace_back(listener, length); | |
| 514 } | |
| 515 | |
| 516 void QuicPacketCreator::SerializePacket(char* encrypted_buffer, | |
| 517 size_t encrypted_buffer_len) { | |
| 518 DCHECK_LT(0u, encrypted_buffer_len); | |
| 519 QUIC_BUG_IF(queued_frames_.empty()) << "Attempt to serialize empty packet"; | |
| 520 QuicPacketHeader header; | |
| 521 // FillPacketHeader increments packet_number_. | |
| 522 FillPacketHeader(&header); | |
| 523 | |
| 524 MaybeAddPadding(); | |
| 525 | |
| 526 DCHECK_GE(max_plaintext_size_, packet_size_); | |
| 527 // Use the packet_size_ instead of the buffer size to ensure smaller | |
| 528 // packet sizes are properly used. | |
| 529 size_t length = framer_->BuildDataPacket(header, queued_frames_, | |
| 530 encrypted_buffer, packet_size_); | |
| 531 if (length == 0) { | |
| 532 QUIC_BUG << "Failed to serialize " << queued_frames_.size() << " frames."; | |
| 533 return; | |
| 534 } | |
| 535 | |
| 536 // ACK Frames will be truncated due to length only if they're the only frame | |
| 537 // in the packet, and if packet_size_ was set to max_plaintext_size_. If | |
| 538 // truncation due to length occurred, then GetSerializedFrameLength will have | |
| 539 // returned all bytes free. | |
| 540 bool possibly_truncated_by_length = packet_size_ == max_plaintext_size_ && | |
| 541 queued_frames_.size() == 1 && | |
| 542 queued_frames_.back().type == ACK_FRAME; | |
| 543 // Because of possible truncation, we can't be confident that our | |
| 544 // packet size calculation worked correctly. | |
| 545 if (!possibly_truncated_by_length) { | |
| 546 DCHECK_EQ(packet_size_, length); | |
| 547 } | |
| 548 const size_t encrypted_length = framer_->EncryptInPlace( | |
| 549 packet_.encryption_level, packet_.path_id, packet_.packet_number, | |
| 550 GetStartOfEncryptedData(framer_->version(), header), length, | |
| 551 encrypted_buffer_len, encrypted_buffer); | |
| 552 if (encrypted_length == 0) { | |
| 553 QUIC_BUG << "Failed to encrypt packet number " << packet_.packet_number; | |
| 554 return; | |
| 555 } | |
| 556 | |
| 557 packet_size_ = 0; | |
| 558 queued_frames_.clear(); | |
| 559 packet_.entropy_hash = QuicFramer::GetPacketEntropyHash(header); | |
| 560 packet_.encrypted_buffer = encrypted_buffer; | |
| 561 packet_.encrypted_length = encrypted_length; | |
| 562 } | |
| 563 | |
| 564 QuicEncryptedPacket* QuicPacketCreator::SerializeVersionNegotiationPacket( | |
| 565 const QuicVersionVector& supported_versions) { | |
| 566 DCHECK_EQ(Perspective::IS_SERVER, framer_->perspective()); | |
| 567 QuicEncryptedPacket* encrypted = QuicFramer::BuildVersionNegotiationPacket( | |
| 568 connection_id_, supported_versions); | |
| 569 DCHECK(encrypted); | |
| 570 DCHECK_GE(max_packet_length_, encrypted->length()); | |
| 571 return encrypted; | |
| 572 } | |
| 573 | |
| 574 // TODO(jri): Make this a public method of framer? | |
| 575 SerializedPacket QuicPacketCreator::NoPacket() { | |
| 576 return SerializedPacket(kInvalidPathId, 0, PACKET_1BYTE_PACKET_NUMBER, | |
| 577 nullptr, 0, 0, false, false); | |
| 578 } | |
| 579 | |
| 580 void QuicPacketCreator::FillPacketHeader(QuicPacketHeader* header) { | |
| 581 header->public_header.connection_id = connection_id_; | |
| 582 header->public_header.connection_id_length = connection_id_length_; | |
| 583 header->public_header.multipath_flag = send_path_id_in_packet_; | |
| 584 header->public_header.reset_flag = false; | |
| 585 header->public_header.version_flag = send_version_in_packet_; | |
| 586 if (IncludeNonceInPublicHeader()) { | |
| 587 DCHECK_EQ(Perspective::IS_SERVER, framer_->perspective()); | |
| 588 header->public_header.nonce = &diversification_nonce_; | |
| 589 } else { | |
| 590 header->public_header.nonce = nullptr; | |
| 591 } | |
| 592 header->path_id = packet_.path_id; | |
| 593 header->packet_number = ++packet_.packet_number; | |
| 594 header->public_header.packet_number_length = packet_.packet_number_length; | |
| 595 header->entropy_flag = random_bool_source_.RandBool(); | |
| 596 } | |
| 597 | |
| 598 bool QuicPacketCreator::ShouldRetransmit(const QuicFrame& frame) { | |
| 599 switch (frame.type) { | |
| 600 case ACK_FRAME: | |
| 601 case PADDING_FRAME: | |
| 602 case STOP_WAITING_FRAME: | |
| 603 case MTU_DISCOVERY_FRAME: | |
| 604 return false; | |
| 605 default: | |
| 606 return true; | |
| 607 } | |
| 608 } | |
| 609 | |
| 610 bool QuicPacketCreator::AddFrame(const QuicFrame& frame, | |
| 611 bool save_retransmittable_frames) { | |
| 612 DVLOG(1) << "Adding frame: " << frame; | |
| 613 if (FLAGS_quic_never_write_unencrypted_data && frame.type == STREAM_FRAME && | |
| 614 frame.stream_frame->stream_id != kCryptoStreamId && | |
| 615 packet_.encryption_level == ENCRYPTION_NONE) { | |
| 616 const string error_details = "Cannot send stream data without encryption."; | |
| 617 QUIC_BUG << error_details; | |
| 618 delegate_->OnUnrecoverableError( | |
| 619 QUIC_ATTEMPT_TO_SEND_UNENCRYPTED_STREAM_DATA, error_details, | |
| 620 ConnectionCloseSource::FROM_SELF); | |
| 621 return false; | |
| 622 } | |
| 623 if (!FLAGS_quic_simple_packet_number_length) { | |
| 624 MaybeUpdatePacketNumberLength(); | |
| 625 } | |
| 626 size_t frame_len = framer_->GetSerializedFrameLength( | |
| 627 frame, BytesFree(), queued_frames_.empty(), true, | |
| 628 packet_.packet_number_length); | |
| 629 if (frame_len == 0) { | |
| 630 // Current open packet is full. | |
| 631 Flush(); | |
| 632 return false; | |
| 633 } | |
| 634 DCHECK_LT(0u, packet_size_); | |
| 635 packet_size_ += ExpansionOnNewFrame() + frame_len; | |
| 636 | |
| 637 if (save_retransmittable_frames && ShouldRetransmit(frame)) { | |
| 638 if (packet_.retransmittable_frames.empty()) { | |
| 639 packet_.retransmittable_frames.reserve(2); | |
| 640 } | |
| 641 packet_.retransmittable_frames.push_back(frame); | |
| 642 queued_frames_.push_back(frame); | |
| 643 if (frame.type == STREAM_FRAME && | |
| 644 frame.stream_frame->stream_id == kCryptoStreamId) { | |
| 645 packet_.has_crypto_handshake = IS_HANDSHAKE; | |
| 646 } | |
| 647 } else { | |
| 648 queued_frames_.push_back(frame); | |
| 649 } | |
| 650 | |
| 651 if (frame.type == ACK_FRAME) { | |
| 652 packet_.has_ack = true; | |
| 653 } | |
| 654 if (frame.type == STOP_WAITING_FRAME) { | |
| 655 packet_.has_stop_waiting = true; | |
| 656 } | |
| 657 if (debug_delegate_ != nullptr) { | |
| 658 debug_delegate_->OnFrameAddedToPacket(frame); | |
| 659 } | |
| 660 | |
| 661 return true; | |
| 662 } | |
| 663 | |
| 664 void QuicPacketCreator::MaybeAddPadding() { | |
| 665 if (packet_.num_padding_bytes == 0) { | |
| 666 return; | |
| 667 } | |
| 668 | |
| 669 if (BytesFree() == 0) { | |
| 670 // Don't pad full packets. | |
| 671 return; | |
| 672 } | |
| 673 | |
| 674 bool success = | |
| 675 AddFrame(QuicFrame(QuicPaddingFrame(packet_.num_padding_bytes)), false); | |
| 676 DCHECK(success); | |
| 677 } | |
| 678 | |
| 679 void QuicPacketCreator::SetCurrentPath( | |
| 680 QuicPathId path_id, | |
| 681 QuicPacketNumber least_packet_awaited_by_peer, | |
| 682 QuicPacketCount max_packets_in_flight) { | |
| 683 if (packet_.path_id == path_id) { | |
| 684 return; | |
| 685 } | |
| 686 | |
| 687 if (HasPendingFrames()) { | |
| 688 QUIC_BUG << "Unable to change paths when a packet is under construction."; | |
| 689 return; | |
| 690 } | |
| 691 // Save current packet number and load switching path's packet number. | |
| 692 multipath_packet_number_[packet_.path_id] = packet_.packet_number; | |
| 693 std::unordered_map<QuicPathId, QuicPacketNumber>::iterator it = | |
| 694 multipath_packet_number_.find(path_id); | |
| 695 // If path_id is not in the map, it's a new path. Set packet_number to 0. | |
| 696 packet_.packet_number = it == multipath_packet_number_.end() ? 0 : it->second; | |
| 697 packet_.path_id = path_id; | |
| 698 DCHECK(packet_.path_id != kInvalidPathId); | |
| 699 // Send path in packet if current path is not the default path. | |
| 700 send_path_id_in_packet_ = packet_.path_id != kDefaultPathId ? true : false; | |
| 701 // Switching path needs to update packet number length. | |
| 702 UpdatePacketNumberLength(least_packet_awaited_by_peer, max_packets_in_flight); | |
| 703 } | |
| 704 | |
| 705 bool QuicPacketCreator::IncludeNonceInPublicHeader() { | |
| 706 return have_diversification_nonce_ && | |
| 707 packet_.encryption_level == ENCRYPTION_INITIAL; | |
| 708 } | |
| 709 | |
| 710 QuicPacketCreator::QuicRandomBoolSource::QuicRandomBoolSource( | |
| 711 QuicRandom* random) | |
| 712 : random_(random), bit_bucket_(0), bit_mask_(0) {} | |
| 713 | |
| 714 QuicPacketCreator::QuicRandomBoolSource::~QuicRandomBoolSource() {} | |
| 715 | |
| 716 bool QuicPacketCreator::QuicRandomBoolSource::RandBool() { | |
| 717 if (bit_mask_ == 0) { | |
| 718 bit_bucket_ = random_->RandUint64(); | |
| 719 bit_mask_ = 1; | |
| 720 } | |
| 721 bool result = ((bit_bucket_ & bit_mask_) != 0); | |
| 722 bit_mask_ <<= 1; | |
| 723 return result; | |
| 724 } | |
| 725 | |
| 726 } // namespace net | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2193073003:
Move shared files in net/quic/ into net/quic/core/ (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master