Turning off CID truncation for proxied connections.

net/quic/quic_connection.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/quic_connection.h"
 
 #include <string.h>
 #include <sys/types.h>
 
 #include <algorithm>
@@ skipping 214 matching lines @@
       sent_packet_manager_(
           is_server, clock_, &stats_,
           FLAGS_quic_use_bbr_congestion_control ? kBBR : kCubic,
           FLAGS_quic_use_time_loss_detection ? kTime : kNack),
       version_negotiation_state_(START_NEGOTIATION),
       is_server_(is_server),
       connected_(true),
       peer_ip_changed_(false),
       peer_port_changed_(false),
       self_ip_changed_(false),
-      self_port_changed_(false) {
+      self_port_changed_(false),
+      can_truncate_connection_ids_(true) {
   DVLOG(1) << ENDPOINT << "Created connection with connection_id: "
            << connection_id;
   if (!FLAGS_quic_unified_timeouts) {
     timeout_alarm_->Set(clock_->ApproximateNow().Add(idle_network_timeout_));
   }
   framer_.set_visitor(this);
   framer_.set_received_entropy_calculator(&received_packet_manager_);
   stats_.connection_creation_time = clock_->ApproximateNow();
   sent_packet_manager_.set_network_change_visitor(this);
 }
@@ skipping 18 matching lines @@
                          config.IdleConnectionStateLifetime());
     } else {
       SetNetworkTimeouts(config.max_time_before_crypto_handshake(),
                          config.max_idle_time_before_crypto_handshake());
     }
   } else {
     SetIdleNetworkTimeout(config.IdleConnectionStateLifetime());
   }
   sent_packet_manager_.SetFromConfig(config);
   if (FLAGS_allow_truncated_connection_ids_for_quic &&
-      config.HasReceivedBytesForConnectionId()) {
+      config.HasReceivedBytesForConnectionId() &&
+      can_truncate_connection_ids_) {
     packet_generator_.SetConnectionIdLength(
         config.ReceivedBytesForConnectionId());
   }
   max_undecryptable_packets_ = config.max_undecryptable_packets();
 }
 
 bool QuicConnection::SelectMutualVersion(
     const QuicVersionVector& available_versions) {
   // Try to find the highest mutual version by iterating over supported
   // versions, starting with the highest, and breaking out of the loop once we
@@ skipping 1760 matching lines @@
   }
   for (size_t i = 0; i < retransmittable_frames->frames().size(); ++i) {
     if (retransmittable_frames->frames()[i].type == CONNECTION_CLOSE_FRAME) {
       return true;
     }
   }
   return false;
 }
 
 }  // namespace net