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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
* This is an abstract class for TCP Fast Open - TFO (RFC7413).
* It is not always safe to use Fast Open. It can be use for requests that
* are replayable.
* Middle boxes can block or reset connections that use TFO, therefore a
* backup connection will be prepared with a delay.
* In case of blocking such a connection tcp socket will terminate only after
* a timeout, therefore a backup connection is needed. If connection is refuse
* the same socketTransport will retry.
* This is implemented by nsHalfopenSocket.
namespace mozilla {
namespace net {
class TCPFastOpen {
// Check if we have a transaction that is safe to be used with TFO.
// Connections over TLS are always safe and some http requests (e.g. GET).
virtual bool FastOpenEnabled() = 0;
// To use TFO we need to have a transaction prepared, e.g. also have
// nsHttpConnection ready. This functions is call by nsSocketTransport to
// setup a connection.
virtual nsresult StartFastOpen() = 0;
// Inform nsHalfopenSocket whether a connection using TFO succeeded or not.
// This will cancel the backup connection and in case of a failure rewind
// the transaction.
virtual void SetFastOpenConnected(nsresult error, bool aWillRetry) = 0;
virtual void FastOpenNotSupported() = 0;
virtual void SetFastOpenStatus(uint8_t tfoStatus) = 0;
} // namespace net
} // namespace mozilla
#endif // TCPFASTOPEN_H__