Enable IPv4 address mapped to IPv6.

net/socket/socket_descriptor.cc

 // Copyright 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/socket_descriptor.h"
 
 #if defined(OS_POSIX)
 #include <sys/types.h>
 #include <sys/socket.h>
 #endif
 
 #include "base/basictypes.h"
 
 #if defined(OS_WIN)
+#include <ws2tcpip.h>
+#include "base/win/windows_version.h"
 #include "net/base/winsock_init.h"
 #endif
 
 namespace net {
 
 PlatformSocketFactory* g_socket_factory = NULL;
 
 PlatformSocketFactory::PlatformSocketFactory() {
 }
 
 PlatformSocketFactory::~PlatformSocketFactory() {
 }
 
 void PlatformSocketFactory::SetInstance(PlatformSocketFactory* factory) {
   g_socket_factory = factory;
 }
 
 SocketDescriptor CreateSocketDefault(int family, int type, int protocol) {
 #if defined(OS_WIN)
   EnsureWinsockInit();
-  return ::WSASocket(family, type, protocol, NULL, 0, WSA_FLAG_OVERLAPPED);
+  SocketDescriptor result = ::WSASocket(family, type, protocol, NULL, 0,
+                                        WSA_FLAG_OVERLAPPED);
+  if (result != kInvalidSocket && family == AF_INET6 &&
+      base::win::OSInfo::GetInstance()->version() >= base::win::VERSION_VISTA) {
+    DWORD value = 0;
+    if (setsockopt(result, IPPROTO_IPV6, IPV6_V6ONLY, (const char*)&value,

[jar (doing other things), 2013/10/04 02:49:19]

nit: please use C++ style 

reinterpret_cast<const char*>(&value)

[halyavin, 2013/10/04 13:16:59]

Done.

+                   sizeof(value))) {
+      closesocket(result);
+      result = kInvalidSocket;

[jar (doing other things), 2013/10/04 02:49:19]

nit: easier to read is a direct:
return kInvalidSocket;

[halyavin, 2013/10/04 13:16:59]

Done.

+    }
+  }
+  return result;
 #else  // OS_WIN
   return ::socket(family, type, protocol);
 #endif  // OS_WIN
 }
 
 SocketDescriptor CreatePlatformSocket(int family, int type, int protocol) {
   if (g_socket_factory)
     return g_socket_factory->CreateSocket(family, type, protocol);
   else
     return CreateSocketDefault(family, type, protocol);
 }
 
 }  // namespace net