Create QUIC_VERSION_16 which breaks the sent_info field out of the ACK

net/quic/quic_connection.cc

Index: net/quic/quic_connection.cc
diff --git a/net/quic/quic_connection.cc b/net/quic/quic_connection.cc
index 75dfd19ace6520127dec0dd88d08d77941afe267..c5035985ea0501be28eb7e7703e81536a82857f2 100644
--- a/net/quic/quic_connection.cc
+++ b/net/quic/quic_connection.cc
@@ -179,6 +179,7 @@ QuicConnection::QuicConnection(QuicGuid guid,
       guid_(guid),
       peer_address_(address),
       largest_seen_packet_with_ack_(0),
+      largest_seen_packet_with_stop_waiting_(0),
       pending_version_negotiation_packet_(false),
       received_packet_manager_(kTCP),
       ack_queued_(false),
@@ -262,7 +263,8 @@ void QuicConnection::OnPacket() {
          last_window_update_frames_.empty() &&
          last_rst_frames_.empty() &&
          last_ack_frames_.empty() &&
-         last_congestion_frames_.empty());
+         last_congestion_frames_.empty() &&
+         last_stop_waiting_frames_.empty());
 }
 
 void QuicConnection::OnPublicResetPacket(
@@ -493,13 +495,11 @@ bool QuicConnection::OnAckFrame(const QuicAckFrame& incoming_ack) {
 
 void QuicConnection::ProcessAckFrame(const QuicAckFrame& incoming_ack) {
   largest_seen_packet_with_ack_ = last_header_.packet_sequence_number;
-
   received_packet_manager_.UpdatePacketInformationReceivedByPeer(
       incoming_ack.received_info);
-  received_packet_manager_.UpdatePacketInformationSentByPeer(
-      incoming_ack.sent_info);
-  // Possibly close any FecGroups which are now irrelevant.
-  CloseFecGroupsBefore(incoming_ack.sent_info.least_unacked + 1);
+  if (version() <= QUIC_VERSION_15) {
+    ProcessStopWaitingFrame(incoming_ack.sent_info);
+  }
 
   sent_entropy_manager_.ClearEntropyBefore(
       received_packet_manager_.least_packet_awaited_by_peer() - 1);
@@ -521,6 +521,14 @@ void QuicConnection::ProcessAckFrame(const QuicAckFrame& incoming_ack) {
   }
 }
 
+void QuicConnection::ProcessStopWaitingFrame(
+    const QuicStopWaitingFrame& stop_waiting) {
+  largest_seen_packet_with_stop_waiting_ = last_header_.packet_sequence_number;
+  received_packet_manager_.UpdatePacketInformationSentByPeer(stop_waiting);
+  // Possibly close any FecGroups which are now irrelevant.
+  CloseFecGroupsBefore(stop_waiting.least_unacked + 1);
+}
+
 bool QuicConnection::OnCongestionFeedbackFrame(
     const QuicCongestionFeedbackFrame& feedback) {
   DCHECK(connected_);
@@ -531,6 +539,28 @@ bool QuicConnection::OnCongestionFeedbackFrame(
   return connected_;
 }
 
+bool QuicConnection::OnStopWaitingFrame(const QuicStopWaitingFrame& frame) {
+  DCHECK(connected_);
+
+  if (last_header_.packet_sequence_number <=
+      largest_seen_packet_with_stop_waiting_) {
+    DVLOG(1) << ENDPOINT << "Received an old stop waiting frame: ignoring";
+    return true;
+  }
+
+  if (!ValidateStopWaitingFrame(frame)) {
+    SendConnectionClose(QUIC_INVALID_STOP_WAITING_DATA);
+    return false;
+  }
+
+  if (debug_visitor_) {
+    debug_visitor_->OnStopWaitingFrame(frame);
+  }
+
+  last_stop_waiting_frames_.push_back(frame);
+  return connected_;
+}
+
 bool QuicConnection::ValidateAckFrame(const QuicAckFrame& incoming_ack) {
   if (incoming_ack.received_info.largest_observed >
       packet_creator_.sequence_number()) {
@@ -551,22 +581,10 @@ bool QuicConnection::ValidateAckFrame(const QuicAckFrame& incoming_ack) {
     return false;
   }
 
-  if (incoming_ack.sent_info.least_unacked <
-      received_packet_manager_.peer_least_packet_awaiting_ack()) {
-    DLOG(ERROR) << ENDPOINT << "Peer's sent low least_unacked: "
-                << incoming_ack.sent_info.least_unacked << " vs "
-                << received_packet_manager_.peer_least_packet_awaiting_ack();
-    // We never process old ack frames, so this number should only increase.
-    return false;
-  }
-
-  if (incoming_ack.sent_info.least_unacked >
-      last_header_.packet_sequence_number) {
-    DLOG(ERROR) << ENDPOINT << "Peer sent least_unacked:"
-                << incoming_ack.sent_info.least_unacked
-                << " greater than the enclosing packet sequence number:"
-                << last_header_.packet_sequence_number;
-    return false;
+  if (version() <= QUIC_VERSION_15) {
+    if (!ValidateStopWaitingFrame(incoming_ack.sent_info)) {
+      return false;
+    }
   }
 
   if (!incoming_ack.received_info.missing_packets.empty() &&
@@ -609,6 +627,29 @@ bool QuicConnection::ValidateAckFrame(const QuicAckFrame& incoming_ack) {
   return true;
 }
 
+bool QuicConnection::ValidateStopWaitingFrame(
+    const QuicStopWaitingFrame& stop_waiting) {
+  if (stop_waiting.least_unacked <
+      received_packet_manager_.peer_least_packet_awaiting_ack()) {
+    DLOG(ERROR) << ENDPOINT << "Peer's sent low least_unacked: "
+                << stop_waiting.least_unacked << " vs "
+                << received_packet_manager_.peer_least_packet_awaiting_ack();
+    // We never process old ack frames, so this number should only increase.
+    return false;
+  }
+
+  if (stop_waiting.least_unacked >
+      last_header_.packet_sequence_number) {
+    DLOG(ERROR) << ENDPOINT << "Peer sent least_unacked:"
+                << stop_waiting.least_unacked
+                << " greater than the enclosing packet sequence number:"
+                << last_header_.packet_sequence_number;
+    return false;
+  }
+
+  return true;
+}
+
 void QuicConnection::OnFecData(const QuicFecData& fec) {
   DCHECK_EQ(IN_FEC_GROUP, last_header_.is_in_fec_group);
   DCHECK_NE(0u, last_header_.fec_group);
@@ -678,9 +719,12 @@ void QuicConnection::OnPacketComplete() {
            << " packet " << last_header_.packet_sequence_number
            << " with " << last_ack_frames_.size() << " acks, "
            << last_congestion_frames_.size() << " congestions, "
+           << last_stop_waiting_frames_.size() << " stop_waiting, "
            << last_goaway_frames_.size() << " goaways, "
            << last_window_update_frames_.size() << " window updates, "
            << last_rst_frames_.size() << " rsts, "
+           << last_blocked_frames_.size() << " blocked, "
+           << last_rst_frames_.size() << " rsts, "
            << last_close_frames_.size() << " closes, "
            << last_stream_frames_.size()
            << " stream frames for " << last_header_.public_header.guid;
@@ -726,6 +770,9 @@ void QuicConnection::OnPacketComplete() {
     sent_packet_manager_.OnIncomingQuicCongestionFeedbackFrame(
         last_congestion_frames_[i], time_of_last_received_packet_);
   }
+  for (size_t i = 0; i < last_stop_waiting_frames_.size(); ++i) {
+    ProcessStopWaitingFrame(last_stop_waiting_frames_[i]);
+  }
   if (!last_close_frames_.empty()) {
     CloseConnection(last_close_frames_[0].error_code, true);
     DCHECK(!connected_);
@@ -768,6 +815,7 @@ void QuicConnection::ClearLastFrames() {
   last_window_update_frames_.clear();
   last_rst_frames_.clear();
   last_ack_frames_.clear();
+  last_stop_waiting_frames_.clear();
   last_congestion_frames_.clear();
 }
 
@@ -775,7 +823,7 @@ QuicAckFrame* QuicConnection::CreateAckFrame() {
   QuicAckFrame* outgoing_ack = new QuicAckFrame();
   received_packet_manager_.UpdateReceivedPacketInfo(
       &(outgoing_ack->received_info), clock_->ApproximateNow());
-  UpdateSentPacketInfo(&(outgoing_ack->sent_info));
+  UpdateStopWaiting(&(outgoing_ack->sent_info));
   DVLOG(1) << ENDPOINT << "Creating ack frame: " << *outgoing_ack;
   return outgoing_ack;
 }
@@ -784,6 +832,12 @@ QuicCongestionFeedbackFrame* QuicConnection::CreateFeedbackFrame() {
   return new QuicCongestionFeedbackFrame(outgoing_congestion_feedback_);
 }
 
+QuicStopWaitingFrame* QuicConnection::CreateStopWaitingFrame() {
+  QuicStopWaitingFrame stop_waiting;
+  UpdateStopWaiting(&stop_waiting);
+  return new QuicStopWaitingFrame(stop_waiting);
+}
+
 bool QuicConnection::ShouldLastPacketInstigateAck() const {
   if (!last_stream_frames_.empty() ||
       !last_goaway_frames_.empty() ||
@@ -795,7 +849,6 @@ bool QuicConnection::ShouldLastPacketInstigateAck() const {
       last_ack_frames_.back().received_info.is_truncated) {
     return true;
   }
-
   return false;
 }
 
@@ -1381,10 +1434,10 @@ bool QuicConnection::SendOrQueuePacket(EncryptionLevel level,
   return false;
 }
 
-void QuicConnection::UpdateSentPacketInfo(SentPacketInfo* sent_info) {
-  sent_info->least_unacked = GetLeastUnacked();
-  sent_info->entropy_hash = sent_entropy_manager_.EntropyHash(
-      sent_info->least_unacked - 1);
+void QuicConnection::UpdateStopWaiting(QuicStopWaitingFrame* stop_waiting) {
+  stop_waiting->least_unacked = GetLeastUnacked();
+  stop_waiting->entropy_hash = sent_entropy_manager_.EntropyHash(
+      stop_waiting->least_unacked - 1);
 }
 
 void QuicConnection::SendAck() {
@@ -1401,7 +1454,8 @@ void QuicConnection::SendAck() {
     send_feedback = true;
   }
 
-  packet_generator_.SetShouldSendAck(send_feedback);
+  packet_generator_.SetShouldSendAck(send_feedback,
+                                     version() > QUIC_VERSION_15);
 }
 
 void QuicConnection::OnRetransmissionTimeout() {