netwerk/base/TCPFastOpen.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef TCPFASTOPEN_H__
   7 #define TCPFASTOPEN_H__
   8
   9 /**
  10  * This is an abstract class for TCP Fast Open - TFO (RFC7413).
  11  * It is not always safe to use Fast Open. It can be use for requests that
  12  * are replayable.
  13  * Middle boxes can block or reset connections that use TFO, therefore a
  14  * backup connection will be prepared with a delay.
  15  * In case of blocking such a connection tcp socket will terminate only after
  16  * a timeout, therefore a backup connection is needed. If connection is refuse
  17  * the same socketTransport will retry.
  18  *
  19  * This is implemented by nsHalfopenSocket.
  20  **/
  21
  22 namespace mozilla {
  23 namespace net {
  24
  25 class TCPFastOpen {
  26  public:
  27   // Check if we have a transaction that is safe to be used with TFO.
  28   // Connections over TLS are always safe and some http requests (e.g. GET).
  29   virtual bool FastOpenEnabled() = 0;
  30   // To use TFO we need to have a transaction prepared, e.g. also have
  31   // nsHttpConnection ready. This functions is call by nsSocketTransport to
  32   // setup a connection.
  33   virtual nsresult StartFastOpen() = 0;
  34   // Inform nsHalfopenSocket whether a connection using TFO succeeded or not.
  35   // This will cancel the backup connection and in case of a failure rewind
  36   // the transaction.
  37   virtual void SetFastOpenConnected(nsresult error, bool aWillRetry) = 0;
  38   virtual void FastOpenNotSupported() = 0;
  39   virtual void SetFastOpenStatus(uint8_t tfoStatus) = 0;
  40 };
  41
  42 }  // namespace net
  43 }  // namespace mozilla
  44
  45 #endif  // TCPFASTOPEN_H__