Implement net_SetDSCP() to set Diffserv code point on a socket.

include/network.h

@@ -102,6 +102,7 @@ VLC_EXPORT( int, __net_OpenUDP, ( vlc_object_t *p_this, const char *psz_bind, in
 VLC_EXPORT( void, net_Close, ( int fd ) );
 VLC_EXPORT( void, net_ListenClose, ( int *fd ) );
 
+VLC_EXPORT( int, net_SetDSCP, ( int fd, uint8_t dscp ) );
 
 /* Functions to read from or write to the networking layer */
 struct virtual_socket_t

include/vlc_symbols.h

@@ -533,6 +533,7 @@ struct module_symbols_t
     playlist_item_t * (*playlist_GetPreferredNode_inner) (playlist_t *p_playlist, playlist_item_t *p_node);
     int (*utf8_fprintf_inner) (FILE *, const char *, ...);
     int (*utf8_vfprintf_inner) (FILE *stream, const char *fmt, va_list ap);
+    int (*net_SetDSCP_inner) (int fd, uint8_t dscp);
 };
 # if defined (__PLUGIN__)
 #  define aout_FiltersCreatePipeline (p_symbols)->aout_FiltersCreatePipeline_inner
@@ -1001,6 +1002,7 @@ struct module_symbols_t
 #  define playlist_GetPreferredNode (p_symbols)->playlist_GetPreferredNode_inner
 #  define utf8_fprintf (p_symbols)->utf8_fprintf_inner
 #  define utf8_vfprintf (p_symbols)->utf8_vfprintf_inner
+#  define net_SetDSCP (p_symbols)->net_SetDSCP_inner
 # elif defined (HAVE_DYNAMIC_PLUGINS) && !defined (__BUILTIN__)
 /******************************************************************
  * STORE_SYMBOLS: store VLC APIs into p_symbols for plugin access.
@@ -1472,6 +1474,7 @@ struct module_symbols_t
     ((p_symbols)->playlist_GetPreferredNode_inner) = playlist_GetPreferredNode; \
     ((p_symbols)->utf8_fprintf_inner) = utf8_fprintf; \
     ((p_symbols)->utf8_vfprintf_inner) = utf8_vfprintf; \
+    ((p_symbols)->net_SetDSCP_inner) = net_SetDSCP; \
     (p_symbols)->net_ConvertIPv4_deprecated = NULL; \
     (p_symbols)->__playlist_ItemNew_deprecated = NULL; \
     (p_symbols)->__playlist_ItemCopy_deprecated = NULL; \

src/network/udp.c

@@ -2,6 +2,8 @@
  * udp.c:
  *****************************************************************************
  * Copyright (C) 2004-2006 the VideoLAN team
+ * Copyright © 2006 Rémi Denis-Courmont
+ *
  * $Id$
  *
  * Authors: Laurent Aimar <fenrir@videolan.org>
@@ -166,6 +168,40 @@ static int net_SetMcastIface( vlc_object_t *p_this,
     return VLC_SUCCESS;
 }
 
+
+int net_SetDSCP( int fd, uint8_t dscp )
+{
+    struct sockaddr_storage addr;
+    if( getsockname( fd, (struct sockaddr *)&addr, &(socklen_t){ sizeof (addr) }) )
+        return -1;
+
+    int level, cmd;
+
+    switch( addr.ss_family )
+    {
+#ifdef IPV6_TCLASS
+        case AF_INET6:
+            level = SOL_IPV6;
+            cmd = IPV6_TCLASS;
+            break;
+#endif
+
+        case AF_INET:
+            level = SOL_IP;
+            cmd = IP_TOS;
+            break;
+
+        default:
+#ifdef ENOPROTOOPT
+            errno = ENOPROTOOPT;
+#endif
+            return -1;
+    }
+
+    return setsockopt( fd, level, cmd, &(int){ dscp }, sizeof (int));
+}
+
+
 /*****************************************************************************
  * __net_ConnectUDP:
  *****************************************************************************