Commit ee9a8f7a authored by Steffen Klassert's avatar Steffen Klassert Committed by David S. Miller

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: default avatarSteffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7f92d334
......@@ -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))
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment