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// 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.
#include "net/socket/tcp_client_socket.h"
#include "base/file_util.h"
#include "base/files/file_path.h"
namespace net {
namespace {
#if defined(OS_LINUX)
// Checks to see if the system supports TCP FastOpen. Notably, it requires
// kernel support. Additionally, this checks system configuration to ensure that
// it's enabled.
bool SystemSupportsTCPFastOpen() {
static const base::FilePath::CharType kTCPFastOpenProcFilePath[] =
"/proc/sys/net/ipv4/tcp_fastopen";
std::string system_enabled_tcp_fastopen;
if (!file_util::ReadFileToString(
base::FilePath(kTCPFastOpenProcFilePath),
&system_enabled_tcp_fastopen)) {
return false;
}
// As per http://lxr.linux.no/linux+v3.7.7/include/net/tcp.h#L225
// TFO_CLIENT_ENABLE is the LSB
if (system_enabled_tcp_fastopen.empty() ||
(system_enabled_tcp_fastopen[0] & 0x1) == 0) {
return false;
}
return true;
}
#else
bool SystemSupportsTCPFastOpen() {
return false;
}
#endif
}
static bool g_tcp_fastopen_enabled = false;
void SetTCPFastOpenEnabled(bool value) {
g_tcp_fastopen_enabled = value && SystemSupportsTCPFastOpen();
}
bool IsTCPFastOpenEnabled() {
return g_tcp_fastopen_enabled;
}
} // namespace net
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