ip6_tunnel: disable dst caching if tunnel is dual-stack

When an ip6_tunnel is in mode 'any', where the transport layer
protocol can be either 4 or 41, dst_cache must be disabled.

This is because xfrm policies might apply to only one of the two
protocols. Caching dst would cause xfrm policies for one protocol
incorrectly used for the other.

Signed-off-by: Eli Cooper <elicooper@gmx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 931c38f6ff4a42fb17cf129cf6035706a24176dc..b263c809d8d43b2abad28f2790ea9e1f5360b7d9 100644 (file)
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1074,10 +1074,11 @@ int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
                        memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
                        neigh_release(neigh);
                }
-       } else if (!(t->parms.flags &
-                    (IP6_TNL_F_USE_ORIG_TCLASS | IP6_TNL_F_USE_ORIG_FWMARK))) {
-               /* enable the cache only only if the routing decision does
-                * not depend on the current inner header value
+       } else if (t->parms.proto != 0 && !(t->parms.flags &
+                                           (IP6_TNL_F_USE_ORIG_TCLASS |
+                                            IP6_TNL_F_USE_ORIG_FWMARK))) {
+               /* enable the cache only if neither the outer protocol nor the
+                * routing decision depends on the current inner header value
                 */
                use_cache = true;
        }