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| author | Andrey Vagin <avagin@openvz.org> | 2010-12-11 15:20:11 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-12-16 12:28:13 -0800 |
| commit | d3052b557a1c94c21f50465702fa886753ce6b43 (patch) | |
| tree | 5a48598ed08bef56cc71355f84eff04f13622780 /net | |
| parent | af3e5bd5f650163c2e12297f572910a1af1b8236 (diff) | |
| download | linux-3.10-d3052b557a1c94c21f50465702fa886753ce6b43.tar.gz linux-3.10-d3052b557a1c94c21f50465702fa886753ce6b43.tar.bz2 linux-3.10-d3052b557a1c94c21f50465702fa886753ce6b43.zip | |
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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv6/route.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 96455ffb76f..7659d6f16e6 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -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; |