ipv4: ip_tunnel: Unmask upper DSCP bits in ip_md_tunnel_xmit()

Unmask the upper DSCP bits when initializing an IPv4 flow key via
ip_tunnel_init_flow() before passing it to ip_route_output_key() so that
in the future we could perform the FIB lookup according to the full DSCP
value.

Note that the 'tos' variable includes the full DS field. Either the one
specified via the tunnel key or the one inherited from the inner packet.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index b632c128ecb75919eb5fd8ca8e3d2deabd1ccbeb..09e0effcd034437facabb933dda002e52682696c 100644 (file)
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -43,6 +43,7 @@
 #include <net/rtnetlink.h>
 #include <net/udp.h>
 #include <net/dst_metadata.h>
+#include <net/inet_dscp.h>
 
 #if IS_ENABLED(CONFIG_IPV6)
 #include <net/ipv6.h>
@@ -609,9 +610,9 @@ void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
                        tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph);
        }
        ip_tunnel_init_flow(&fl4, proto, key->u.ipv4.dst, key->u.ipv4.src,
-                           tunnel_id_to_key32(key->tun_id), RT_TOS(tos),
-                           dev_net(dev), 0, skb->mark, skb_get_hash(skb),
-                           key->flow_flags);
+                           tunnel_id_to_key32(key->tun_id),
+                           tos & INET_DSCP_MASK, dev_net(dev), 0, skb->mark,
+                           skb_get_hash(skb), key->flow_flags);
 
        if (!tunnel_hlen)
                tunnel_hlen = ip_encap_hlen(&tun_info->encap);