Allow p2p UDP packages to set DSCP

net/udp/udp_socket_libevent.cc

 // 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.
 
 #include "net/udp/udp_socket_libevent.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <netdb.h>
 #include <sys/socket.h>
@@ skipping 513 matching lines @@
                       &ttl, sizeof(ttl));
     } else {
       // Signed interger. -1 to use route default.
       int ttl = multicast_time_to_live_;
       rv = setsockopt(socket_, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
                       &ttl, sizeof(ttl));
     }
     if (rv < 0)
       return MapSystemError(errno);
   }
+

[Alpha Left Google, 2013/08/08 23:28:26]

nit: Don't add empty lines.

[hubbe, 2013/08/15 23:31:11]

Done.

   return OK;
 }
 
 int UDPSocketLibevent::DoBind(const IPEndPoint& address) {
   SockaddrStorage storage;
   if (!address.ToSockAddr(storage.addr, &storage.addr_len))
     return ERR_ADDRESS_INVALID;
   int rv = bind(socket_, storage.addr, storage.addr_len);
   return rv < 0 ? MapSystemError(errno) : rv;
 }
@@ skipping 100 matching lines @@
   DCHECK(CalledOnValidThread());
   if (is_connected())
     return ERR_SOCKET_IS_CONNECTED;
 
   if (loopback)
     socket_options_ |= SOCKET_OPTION_MULTICAST_LOOP;
   else
     socket_options_ &= ~SOCKET_OPTION_MULTICAST_LOOP;
   return OK;
 }
+
+int UDPSocketLibevent::SetToS(DiffServCodePoint dscp) {
+  if (dscp == DSCP_NO_CHANGE) {
+    return OK;
+  }
+  int rv;
+  int dscp_and_ecn = dscp << 2;
+  if (addr_family_ == AF_INET) {
+    rv = setsockopt(socket_, IPPROTO_IP, IP_TOS,
+                    &dscp_and_ecn, sizeof(dscp_and_ecn));
+  } else {
+    rv = setsockopt(socket_, IPPROTO_IPV6, IPV6_TCLASS,
+                    &dscp_and_ecn, sizeof(dscp_and_ecn));
+  }
+  if (rv < 0)
+    return MapSystemError(errno);
+
+  return OK;
+}
+
 }  // namespace net