ipv6: Fix traffic triggered IPsec connections.

A recent patch removed the dst_free() on the allocated
dst_entry in ipv6_blackhole_route(). The dst_free() marked
the dst_entry as dead and added it to the gc list. I.e. it
was setup for a one time usage. As a result we may now have
a blackhole route cached at a socket on some IPsec scenarios.
This makes the connection unusable.

Fix this by marking the dst_entry directly at allocation time
as 'dead', so it is used only once.

Fixes: 587fea741134 ("ipv6: mark DST_NOGC and remove the operation of dst_free()")
Reported-by: Tobias Brunner <tobias@strongswan.org>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 26cc9f483b6d282f0a665bfc4c2c206da7981921..a96d5b385d8fa25bab416d3f6bc836e743b3ca99 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1325,7 +1325,7 @@ struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_ori
        struct dst_entry *new = NULL;
 
        rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1,
-                      DST_OBSOLETE_NONE, 0);
+                      DST_OBSOLETE_DEAD, 0);
        if (rt) {
                rt6_info_init(rt);