gre: fix ToS/DiffServ inherit bug

Fixes two bugs:
- ToS/DiffServ inheritance was unintentionally activated when using impair fixed ToS values
- ECN bit was lost during ToS/DiffServ inheritance

Signed-off-by: Andreas Jaggi <aj@open.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 44e2a3d2359afd99da1324022c221e811d83a0a9..cb4a0f4bd5e5654b465ddee4f32a42504711d5d3 100644 (file)
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -735,10 +735,10 @@ static int ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
        }
 
        tos = tiph->tos;
-       if (tos&1) {
+       if (tos == 1) {
+               tos = 0;
                if (skb->protocol == htons(ETH_P_IP))
                        tos = old_iph->tos;
-               tos &= ~1;
        }
 
        {