ipv6: delete expired route in ip6_pmtu_deliver
The first big packets sent to a "low-MTU" client correctly triggers the creation of a temporary route containing the reduced MTU. But after the temporary route has expired, new ICMP6 "packet too big" will be sent, rt6_pmtu_discovery will find the previous EXPIRED route check that its mtu isn't bigger then in icmp packet and do nothing before the temporary route will not deleted by gc. I make the simple experiment: while :; do time ( dd if=/dev/zero bs=10K count=1 | ssh hostname dd of=/dev/null ) || break; done The "time" reports real 0m0.197s if a temporary route isn't expired, but it reports real 0m52.837s (!!!!) immediately after a temporare route has expired. Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
af3e5bd5f6
commit
d3052b557a
|
@ -1565,11 +1565,16 @@ static void rt6_do_pmtu_disc(struct in6_addr *daddr, struct in6_addr *saddr,
|
|||
{
|
||||
struct rt6_info *rt, *nrt;
|
||||
int allfrag = 0;
|
||||
|
||||
again:
|
||||
rt = rt6_lookup(net, daddr, saddr, ifindex, 0);
|
||||
if (rt == NULL)
|
||||
return;
|
||||
|
||||
if (rt6_check_expired(rt)) {
|
||||
ip6_del_rt(rt);
|
||||
goto again;
|
||||
}
|
||||
|
||||
if (pmtu >= dst_mtu(&rt->dst))
|
||||
goto out;
|
||||
|
||||
|
|
Loading…
Reference in New Issue