Allow p2p UDP packages to set DSCP

net/udp/udp_socket_win.h

 // Copyright (c) 2012 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.
 
 #ifndef NET_UDP_UDP_SOCKET_WIN_H_
 #define NET_UDP_UDP_SOCKET_WIN_H_
 
 #include <winsock2.h>
 
 #include "base/memory/ref_counted.h"
@@ skipping 133 matching lines @@
   // Note: the behavior of |SetMulticastLoopbackMode| is slightly
   // different between Windows and Unix-like systems. The inconsistency only
   // happens when there are more than one applications on the same host
   // joined to the same multicast group while having different settings on
   // multicast loopback mode. On Windows, the applications with loopback off
   // will not RECEIVE the loopback packets; while on Unix-like systems, the
   // applications with loopback off will not SEND the loopback packets to
   // other applications on the same host. See MSDN: http://goo.gl/6vqbj
   int SetMulticastLoopbackMode(bool loopback);
 
+  // Set the differentiated services flags on outgoing packets. May not
+  // do anything on some platforms.
+  int SetTos(DiffServCodePoint dscp);
+
  private:
   enum SocketOptions {
     SOCKET_OPTION_REUSE_ADDRESS  = 1 << 0,
     SOCKET_OPTION_BROADCAST      = 1 << 1,
     SOCKET_OPTION_MULTICAST_LOOP = 1 << 2
   };
 
   class Core;
 
   void DoReadCallback(int rv);
@@ skipping 36 matching lines @@
   int addr_family_;
 
   // Bitwise-or'd combination of SocketOptions. Specifies the set of
   // options that should be applied to |socket_| before Bind().
   int socket_options_;
 
   // Multicast socket options cached for SetSocketOption.
   // Cannot be used after Bind().
   int multicast_time_to_live_;
 
+  // Differentiated Services Code Point.

[cbentzel, 2013/08/21 22:00:20]

Not being used.

[hubbe, 2013/08/22 23:41:02]

Done.

+  DiffServCodePoint dscp_;
+
   // How to do source port binding, used only when UDPSocket is part of
   // UDPClientSocket, since UDPServerSocket provides Bind.
   DatagramSocket::BindType bind_type_;
 
   // PRNG function for generating port numbers.
   RandIntCallback rand_int_cb_;
 
   // These are mutable since they're just cached copies to make
   // GetPeerAddress/GetLocalAddress smarter.
   mutable scoped_ptr<IPEndPoint> local_address_;
@@ skipping 17 matching lines @@
   CompletionCallback write_callback_;
 
   BoundNetLog net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(UDPSocketWin);
 };
 
 }  // namespace net
 
 #endif  // NET_UDP_UDP_SOCKET_WIN_H_