Plumbing for TCP FastOpen for SSL sockets.

net/socket/tcp_socket_libevent.h

 // Copyright 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_SOCKET_TCP_SOCKET_LIBEVENT_H_
 #define NET_SOCKET_TCP_SOCKET_LIBEVENT_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "net/base/address_family.h"
 #include "net/base/completion_callback.h"
 #include "net/base/net_export.h"
 #include "net/base/net_log.h"
 
 namespace net {
 
 class AddressList;
 class IOBuffer;
 class IPEndPoint;
 class SocketLibevent;
 
+// Checks if TCP FastOpen is supported by the kernel. Also enables TFO for all
+// connections if indicated by user.
+// Not thread safe.  Must be called during initialization/startup only.
+NET_EXPORT void CheckSupportAndMaybeEnableTCPFastOpen(bool user_enabled);
+
 class NET_EXPORT TCPSocketLibevent {
  public:
   TCPSocketLibevent(NetLog* net_log, const NetLog::Source& source);
   virtual ~TCPSocketLibevent();
 
   int Open(AddressFamily family);
   // Takes ownership of |socket_fd|.
   int AdoptConnectedSocket(int socket_fd, const IPEndPoint& peer_address);
 
   int Bind(const IPEndPoint& address);
@@ skipping 24 matching lines @@
   // - SetKeepAlive(true, 45).
   void SetDefaultOptionsForClient();
   int SetAddressReuse(bool allow);
   int SetReceiveBufferSize(int32 size);
   int SetSendBufferSize(int32 size);
   bool SetKeepAlive(bool enable, int delay);
   bool SetNoDelay(bool no_delay);
 
   void Close();
 
+  // Setter/Getter methods for TCP FastOpen socket option.
   bool UsingTCPFastOpen() const;
+  void EnableTCPFastOpen();
+
   bool IsValid() const;
 
   // Marks the start/end of a series of connect attempts for logging purpose.
   //
   // TCPClientSocket may attempt to connect to multiple addresses until it
   // succeeds in establishing a connection. The corresponding log will have
   // multiple NetLog::TYPE_TCP_CONNECT_ATTEMPT entries nested within a
   // NetLog::TYPE_TCP_CONNECT. These methods set the start/end of
   // NetLog::TYPE_TCP_CONNECT.
   //
@@ skipping 82 matching lines @@
                        int buf_len,
                        const CompletionCallback& callback);
 
   // Called when the socket is known to be in a connected state.
   void RecordFastOpenStatus();
 
   scoped_ptr<SocketLibevent> socket_;
   scoped_ptr<SocketLibevent> accept_socket_;
 
   // Enables experimental TCP FastOpen option.
-  const bool use_tcp_fastopen_;
+  bool use_tcp_fastopen_;
 
   // True when TCP FastOpen is in use and we have done the connect.
   bool tcp_fastopen_connected_;
-
-  FastOpenStatus fast_open_status_;
+FastOpenStatus fast_open_status_;
 
   bool logging_multiple_connect_attempts_;
 
   BoundNetLog net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(TCPSocketLibevent);
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_TCP_SOCKET_LIBEVENT_H_