1 files changed, 42 insertions, 0 deletions
diff --git a/third_party/libwebrtc/webrtc/rtc_base/nethelper.cc b/third_party/libwebrtc/webrtc/rtc_base/nethelper.cc
new file mode 100644
index 0000000000..e654fe3925
--- /dev/null
+++ b/third_party/libwebrtc/webrtc/rtc_base/nethelper.cc
@@ -0,0 +1,42 @@
+/*
+ *  Copyright 2017 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "rtc_base/nethelper.h"
+
+#include "rtc_base/checks.h"
+#include "rtc_base/ipaddress.h"
+
+namespace cricket {
+
+const char UDP_PROTOCOL_NAME[] = "udp";
+const char TCP_PROTOCOL_NAME[] = "tcp";
+const char SSLTCP_PROTOCOL_NAME[] = "ssltcp";
+const char TLS_PROTOCOL_NAME[] = "tls";
+
+int GetIpOverhead(int addr_family) {
+  switch (addr_family) {
+    case AF_INET:  // IPv4
+      return 20;
+    case AF_INET6:  // IPv6
+      return 40;
+    default:
+      RTC_NOTREACHED() << "Invaild address family.";
+      return 0;
+  }
+}
+
+int GetProtocolOverhead(const std::string& protocol) {
+  if (protocol == TCP_PROTOCOL_NAME || protocol == SSLTCP_PROTOCOL_NAME) {
+    return 20;
+  }
+  return 8;
+}
+
+}  // namespace cricket