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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* 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 */
#ifndef TCPFastOpenLayer_h__
#define TCPFastOpenLayer_h__
#include "prerror.h"
namespace mozilla {
namespace net {
* This layer must be placed just above PR-tcp socket, i.e. it must be under
* nss layer.
* At the beginning of TCPFastOpenLayer.cpp there is explanation what this
* layer do.
typedef enum {
TFO_NOT_SET, // This is only as a control.
// A connection not using TFO will have the TFO state set upon
// connection creation (in nsHalfOpenSocket::SetupConn).
// A connection using TFO will have the TFO state set after
// the connection is established or canceled.
TFO_UNKNOWN, // This is before the primary socket is built, i.e. before
// TCPFastOpenFinish is called.
TFO_DISABLED, // tfo is disabled because of a tfo error on a previous
// connection to the host (i.e. !mEnt->mUseFastOpen).
// If TFO is not supported by the OS, it is disabled by
// the pref or too many consecutive errors occurred, this value
// is not reported. This is set before StartFastOpen is called.
TFO_DISABLED_CONNECT, // Connection is using CONNECT. This is set before
// StartFastOpen is called.
// The following 3 are set just after TCPFastOpenFinish.
TFO_NOT_TRIED, // For some reason TCPFastOpenLayer does not have any data to
// send with the syn packet. This should never happen.
TFO_TRIED, // TCP has sent a TFO cookie request.
TFO_DATA_SENT, // On Linux, TCP has send data as well. (On Linux we do not
// know whether data has been accepted).
// On Windows, TCP has send data or only a TFO cookie request
// and the data or TFO cookie has been accepted by the server.
// The following value is only used on windows and is set after
// PR_ConnectContinue. That is the point when we know if TFO data was been
// accepted.
TFO_DATA_COOKIE_NOT_ACCEPTED, // This is only on Windows. TFO data or TFO
// cookie request has not been accepted.
// The following 3 are set during socket error recover
// (nsSocketTransport::RecoverFromError).
// The following 4 are set when backup connection finishes before the primary
// connection.
// The following 4 are set when the recovery connection fails as well.
TFO_BACKUP_CONN, // This is a backup conn, for a halfOpenSock that was used
// TFO.
TFO_INIT_FAILED, // nsHalfOpenSocket::SetupConn failed.
TFO_UNKNOWN_RESOLVING, // There is a high number of TFO_UNKNOWN state
// reported. Let's split them depending on the socket
// transport state: TFO_UNKNOWN_RESOLVING,
TFO_HTTP // TFO is disabled for non-secure connections.
} TFOResult;
nsresult AttachTCPFastOpenIOLayer(PRFileDesc* fd);
// Get the result of TCP Fast Open.
void TCPFastOpenFinish(PRFileDesc* fd, PRErrorCode& err,
bool& fastOpenNotSupported, uint8_t& tfoStatus);
int32_t TCPFastOpenGetBufferSizeLeft(PRFileDesc* fd);
bool TCPFastOpenGetCurrentBufferSize(PRFileDesc* fd);
bool TCPFastOpenFlushBuffer(PRFileDesc* fd);
} // namespace net
} // namespace mozilla
#endif // TCPFastOpenLayer_h__