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authorSteffen Klassert <steffen.klassert@secunet.com>2012-10-08 00:56:54 +0000
committerDavid S. Miller <davem@davemloft.net>2012-10-08 14:46:35 -0400
commitee9a8f7ab2edf801b8b514c310455c94acc232f6 (patch)
tree354084bb26d1ce12bb552ced3cdd653fc63989db /net/ipv4/route.c
parent7f92d334ba19a0d8e96f8f8f092219553367d921 (diff)
ipv4: Don't report stale pmtu values to userspace
We report cached pmtu values even if they are already expired. Change this to not report these values after they are expired and fix a race in the expire time calculation, as suggested by Eric Dumazet. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/route.c')
-rw-r--r--net/ipv4/route.c19
1 files changed, 11 insertions, 8 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 741df67a81e..132e0dfee53 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2187,8 +2187,18 @@ static int rt_fill_info(struct net *net, __be32 dst, __be32 src,
nla_put_be32(skb, RTA_GATEWAY, rt->rt_gateway))
goto nla_put_failure;
+ expires = rt->dst.expires;
+ if (expires) {
+ unsigned long now = jiffies;
+
+ if (time_before(now, expires))
+ expires -= now;
+ else
+ expires = 0;
+ }
+
memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
- if (rt->rt_pmtu)
+ if (rt->rt_pmtu && expires)
metrics[RTAX_MTU - 1] = rt->rt_pmtu;
if (rtnetlink_put_metrics(skb, metrics) < 0)
goto nla_put_failure;
@@ -2198,13 +2208,6 @@ static int rt_fill_info(struct net *net, __be32 dst, __be32 src,
goto nla_put_failure;
error = rt->dst.error;
- expires = rt->dst.expires;
- if (expires) {
- if (time_before(jiffies, expires))
- expires -= jiffies;
- else
- expires = 0;
- }
if (rt_is_input_route(rt)) {
if (nla_put_u32(skb, RTA_IIF, rt->rt_iif))