ipvlan: Unmask upper DSCP bits in ipvlan_process_v4_outbound()

Unmask the upper DSCP bits when calling ip_route_output_flow() so that
in the future it could perform the FIB lookup according to the full DSCP
value.
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ipvlan/ipvlan_core.c

@@ -2,6 +2,8 @@
 /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
  */
 
+#include <net/inet_dscp.h>
+
 #include "ipvlan.h"
 
 static u32 ipvlan_jhash_secret __read_mostly;
@@ -420,7 +422,7 @@ static noinline_for_stack int ipvlan_process_v4_outbound(struct sk_buff *skb)
 	int err, ret = NET_XMIT_DROP;
 	struct flowi4 fl4 = {
 		.flowi4_oif = dev->ifindex,
-		.flowi4_tos = RT_TOS(ip4h->tos),
+		.flowi4_tos = ip4h->tos & INET_DSCP_MASK,
 		.flowi4_flags = FLOWI_FLAG_ANYSRC,
 		.flowi4_mark = skb->mark,
 		.daddr = ip4h->daddr,