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>
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net/ipv6
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@ -1565,11 +1565,16 @@ static void rt6_do_pmtu_disc(struct in6_addr *daddr, struct in6_addr *saddr,
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{
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struct rt6_info *rt, *nrt;
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int allfrag = 0;
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again:
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rt = rt6_lookup(net, daddr, saddr, ifindex, 0);
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if (rt == NULL)
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return;
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if (rt6_check_expired(rt)) {
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ip6_del_rt(rt);
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goto again;
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}
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if (pmtu >= dst_mtu(&rt->dst))
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goto out;
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