Patch "ip6_tunnel: disable dst caching if tunnel is dual-stack" has been added to the 4.9-stable tree

Patch "ip6_tunnel: disable dst caching if tunnel is dual-stack" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    ip6_tunnel: disable dst caching if tunnel is dual-stack

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     ip6_tunnel-disable-dst-caching-if-tunnel-is-dual-stack.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Sat Jan 13 10:51:19 CET 2018
From: Eli Cooper <elicooper@gmx.com>
Date: Mon, 25 Dec 2017 10:43:49 +0800
Subject: ip6_tunnel: disable dst caching if tunnel is dual-stack

From: Eli Cooper <elicooper@gmx.com>


[ Upstream commit 23263ec86a5f44312d2899323872468752324107 ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/ipv6/ip6_tunnel.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1080,10 +1080,11 @@ int ip6_tnl_xmit(struct sk_buff *skb, st
 			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;
 	}


Patches currently in stable-queue which might be from elicooper@gmx.com are

queue-4.9/ip6_tunnel-disable-dst-caching-if-tunnel-is-dual-stack.patch