linux-kernel - [ 44/66] ipv4: Fix flushing of cached routing informations

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Date:	Wed, 14 Nov 2012 20:10:49 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk,
	Steffen Klassert <steffen.klassert@...unet.com>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 44/66] ipv4: Fix flushing of cached routing informations

3.6-stable review patch.  If anyone has any objections, please let me know.

------------------


From: Steffen Klassert <steffen.klassert@...unet.com>

[ 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 <steffen.klassert@...unet.com>
Acked-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 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);


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