Introduce QUIC_VERSION_20: allowing endpoints to set different

net/quic/quic_protocol.h

 // 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.
 
 #ifndef NET_QUIC_QUIC_PROTOCOL_H_
 #define NET_QUIC_QUIC_PROTOCOL_H_
 
 #include <stddef.h>
 #include <limits>
 #include <map>
@@ skipping 46 matching lines @@
 // additional 8 bytes.  This is a total overhead of 48 bytes.  Ethernet's
 // max packet size is 1500 bytes,  1500 - 48 = 1452.
 const QuicByteCount kMaxPacketSize = 1452;
 // Default maximum packet size used in Linux TCP implementations.
 const QuicByteCount kDefaultTCPMSS = 1460;
 
 // Maximum size of the initial congestion window in packets.
 const size_t kDefaultInitialWindow = 10;
 const uint32 kMaxInitialWindow = 100;
 
-// Default size of initial flow control window.
+// Default size of initial flow control window, for both stream and session.
 const uint32 kDefaultFlowControlSendWindow = 16 * 1024;  // 16 KB
 
 // Maximum size of the congestion window, in packets, for TCP congestion control
 // algorithms.
 const size_t kMaxTcpCongestionWindow = 200;
 
 // Don't allow a client to suggest an RTT longer than 15 seconds.
 const uint32 kMaxInitialRoundTripTimeUs = 15 * kNumMicrosPerSecond;
 
 // Maximum number of open streams per connection.
@@ skipping 194 matching lines @@
 // helper methods QuicVersionToQuicTag, QuicTagToQuicVersion, and
 // QuicVersionToString.
 enum QuicVersion {
   // Special case to indicate unknown/unsupported QUIC version.
   QUIC_VERSION_UNSUPPORTED = 0,
 
   QUIC_VERSION_15 = 15,
   QUIC_VERSION_16 = 16,
   QUIC_VERSION_17 = 17,
   QUIC_VERSION_18 = 18,
-  QUIC_VERSION_19 = 19,  // Current version.
+  QUIC_VERSION_19 = 19,
+  QUIC_VERSION_20 = 20,  // Current version.
 };
 
 // This vector contains QUIC versions which we currently support.
 // This should be ordered such that the highest supported version is the first
 // element, with subsequent elements in descending order (versions can be
 // skipped as necessary).
 //
 // IMPORTANT: if you are addding to this list, follow the instructions at
 // http://sites/quic/adding-and-removing-versions
-static const QuicVersion kSupportedQuicVersions[] = {QUIC_VERSION_19,
+static const QuicVersion kSupportedQuicVersions[] = {QUIC_VERSION_20,
+                                                     QUIC_VERSION_19,
                                                      QUIC_VERSION_18,
                                                      QUIC_VERSION_17,
                                                      QUIC_VERSION_16,
                                                      QUIC_VERSION_15};
 
 typedef std::vector<QuicVersion> QuicVersionVector;
 
 // Returns a vector of QUIC versions in kSupportedQuicVersions.
 NET_EXPORT_PRIVATE QuicVersionVector QuicSupportedVersions();
 
@@ skipping 758 matching lines @@
   // Stores the sequence numbers of all transmissions of this packet.
   // Can never be null.
   SequenceNumberSet* all_transmissions;
   // In flight packets have not been abandoned or lost.
   bool in_flight;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_PROTOCOL_H_