Chromium Code Reviews Chromium Code Reviews
Issue 451383002:
Plumbing for TCP FastOpen for SSL sockets. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master| OLD | NEW |
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| 1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
|
mmenke
2014/08/14 17:56:03
Don't need this file any more.
| |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | |
| 5 #include "net/socket/tcp_socket.h" | |
| 6 | |
| 7 #include "base/file_util.h" | |
| 8 #include "base/files/file_path.h" | |
| 9 #include "base/location.h" | |
| 10 #include "base/memory/ref_counted.h" | |
| 11 #include "base/threading/worker_pool.h" | |
| 12 | |
| 13 namespace net { | |
| 14 | |
| 15 namespace { | |
| 16 | |
| 17 bool g_tcp_fastopen_enabled = false; | |
| 18 | |
| 19 #if defined(OS_LINUX) || defined(OS_ANDROID) | |
| 20 | |
| 21 typedef base::RefCountedData<bool> SharedBoolean; | |
| 22 | |
| 23 // Checks to see if the system supports TCP FastOpen. Notably, it requires | |
| 24 // kernel support. Additionally, this checks system configuration to ensure that | |
| 25 // it's enabled. | |
| 26 void SystemSupportsTCPFastOpen(scoped_refptr<SharedBoolean> supported) { | |
| 27 supported->data = false; | |
| 28 static const base::FilePath::CharType kTCPFastOpenProcFilePath[] = | |
| 29 "/proc/sys/net/ipv4/tcp_fastopen"; | |
| 30 std::string system_enabled_tcp_fastopen; | |
| 31 if (!base::ReadFileToString(base::FilePath(kTCPFastOpenProcFilePath), | |
| 32 &system_enabled_tcp_fastopen)) { | |
| 33 return; | |
| 34 } | |
| 35 | |
| 36 // As per http://lxr.linux.no/linux+v3.7.7/include/net/tcp.h#L225 | |
| 37 // TFO_CLIENT_ENABLE is the LSB | |
| 38 if (system_enabled_tcp_fastopen.empty() || | |
| 39 (system_enabled_tcp_fastopen[0] & 0x1) == 0) { | |
| 40 return; | |
| 41 } | |
| 42 | |
| 43 supported->data = true; | |
| 44 } | |
| 45 | |
| 46 void EnableCallback(scoped_refptr<SharedBoolean> supported) { | |
| 47 g_tcp_fastopen_enabled = supported->data; | |
| 48 } | |
| 49 | |
| 50 // This is asynchronous because it needs to do file IO, and it isn't allowed to | |
| 51 // do that on the IO thread. | |
| 52 void EnableFastOpenIfSupported() { | |
| 53 scoped_refptr<SharedBoolean> supported = new SharedBoolean; | |
| 54 base::WorkerPool::PostTaskAndReply( | |
| 55 FROM_HERE, | |
| 56 base::Bind(SystemSupportsTCPFastOpen, supported), | |
| 57 base::Bind(EnableCallback, supported), | |
| 58 false); | |
| 59 } | |
| 60 | |
| 61 #else | |
| 62 | |
| 63 void EnableFastOpenIfSupported() { | |
| 64 g_tcp_fastopen_enabled = false; | |
| 65 } | |
| 66 | |
| 67 #endif | |
| 68 | |
| 69 } // namespace | |
| 70 | |
| 71 void SetTCPFastOpenEnabled(bool value) { | |
| 72 if (value) { | |
| 73 EnableFastOpenIfSupported(); | |
| 74 } else { | |
| 75 g_tcp_fastopen_enabled = false; | |
| 76 } | |
| 77 } | |
| 78 | |
| 79 bool IsTCPFastOpenEnabled() { | |
| 80 return g_tcp_fastopen_enabled; | |
| 81 } | |
| 82 | |
| 83 } // namespace net | |
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