relnote: Allowing multipath support negotiation. Protected by --quic_enable_multipath, default valu…

net/quic/quic_config.h

 // Copyright (c) 2013 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_CONFIG_H_
 #define NET_QUIC_QUIC_CONFIG_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 57 matching lines @@
   bool negotiated() const { return negotiated_; }
 
  protected:
   void set_negotiated(bool negotiated) { negotiated_ = negotiated; }
 
  private:
   bool negotiated_;
 };
 
 class NET_EXPORT_PRIVATE QuicNegotiableUint32 : public QuicNegotiableValue {
+  // TODO(fayang): some negotiated values use uint32 as bool (e.g., silent
+  // close). Consider adding a QuicNegotiableBool type.
  public:
   // Default and max values default to 0.
   QuicNegotiableUint32(QuicTag name, QuicConfigPresence presence);
   ~QuicNegotiableUint32() override;
 
   // Sets the maximum possible value that can be achieved after negotiation and
   // also the default values to be assumed if PRESENCE_OPTIONAL and the *HLO msg
   // doesn't contain a value corresponding to |name_|. |max| is serialised via
   // ToHandshakeMessage call if |negotiated_| is false.
   void set(uint32_t max, uint32_t default_value);
@@ skipping 232 matching lines @@
 
   uint32_t ReceivedInitialSessionFlowControlWindowBytes() const;
 
   // Sets socket receive buffer to transmit to the peer.
   void SetSocketReceiveBufferToSend(uint32_t window_bytes);
 
   bool HasReceivedSocketReceiveBuffer() const;
 
   uint32_t ReceivedSocketReceiveBuffer() const;
 
+  void SetMultipathEnabled(bool multipath_enabled);
+
+  bool MultipathEnabled() const;
+
   bool negotiated() const;
 
   // ToHandshakeMessage serialises the settings in this object as a series of
   // tags /value pairs and adds them to |out|.
   void ToHandshakeMessage(CryptoHandshakeMessage* out) const;
 
   // Calls ProcessPeerHello on each negotiable parameter. On failure returns
   // the corresponding QuicErrorCode and sets detailed error in |error_details|.
   QuicErrorCode ProcessPeerHello(const CryptoHandshakeMessage& peer_hello,
                                  HelloType hello_type,
@@ skipping 26 matching lines @@
   // Initial round trip time estimate in microseconds.
   QuicFixedUint32 initial_round_trip_time_us_;
 
   // Initial stream flow control receive window in bytes.
   QuicFixedUint32 initial_stream_flow_control_window_bytes_;
   // Initial session flow control receive window in bytes.
   QuicFixedUint32 initial_session_flow_control_window_bytes_;
 
   // Socket receive buffer in bytes.
   QuicFixedUint32 socket_receive_buffer_;
+
+  // Whether to support multipath for this connection.
+  QuicNegotiableUint32 multipath_enabled_;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_CONFIG_H_