This is a note to let you know that I've just added the patch titled
ipv4: Fix flushing of cached routing informations
to the 3.6-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:
ipv4-fix-flushing-of-cached-routing-informations.patch
and it can be found in the queue-3.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From d0469d7ba38ac653c329264326f234440b1c8866 Mon Sep 17 00:00:00 2001
From: Steffen Klassert <[email protected]>
Date: Wed, 17 Oct 2012 21:17:44 +0000
Subject: ipv4: Fix flushing of cached routing informations
From: Steffen Klassert <[email protected]>
[ Upstream commit 13d82bf50dce632355fcccafa4fe44a9b5e706d8 ]
Currently we can not flush cached pmtu/redirect informations via
the ipv4_sysctl_rtcache_flush sysctl. We need to check the rt_genid
of the old route and reset the nh exeption if the old route is
expired when we bind a new route to a nh exeption.
Signed-off-by: Steffen Klassert <[email protected]>
Acked-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
net/ipv4/route.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1166,8 +1166,12 @@ static bool rt_bind_exception(struct rta
spin_lock_bh(&fnhe_lock);
if (daddr == fnhe->fnhe_daddr) {
- struct rtable *orig;
-
+ struct rtable *orig = rcu_dereference(fnhe->fnhe_rth);
+ if (orig && rt_is_expired(orig)) {
+ fnhe->fnhe_gw = 0;
+ fnhe->fnhe_pmtu = 0;
+ fnhe->fnhe_expires = 0;
+ }
if (fnhe->fnhe_pmtu) {
unsigned long expires = fnhe->fnhe_expires;
unsigned long diff = expires - jiffies;
@@ -1184,7 +1188,6 @@ static bool rt_bind_exception(struct rta
} else if (!rt->rt_gateway)
rt->rt_gateway = daddr;
- orig = rcu_dereference(fnhe->fnhe_rth);
rcu_assign_pointer(fnhe->fnhe_rth, rt);
if (orig)
rt_free(orig);
Patches currently in stable-queue which might be from
[email protected] are
queue-3.6/ipv4-fix-flushing-of-cached-routing-informations.patch
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