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route: update fnhe_expires for redirect when the fnhe exists

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Now when creating fnhe for redirect, it sets fnhe_expires for this
new route cache. But when updating the exist one, it doesn't do it.
It will cause this fnhe never to be expired.

Paolo already noticed it before, in Jianlin's test case, it became
even worse:

When ip route flush cache, the old fnhe is not to be removed, but
only clean it's members. When redirect comes again, this fnhe will
be found and updated, but never be expired due to fnhe_expires not
being set.

So fix it by simply updating fnhe_expires even it's for redirect.

Fixes: aee06da672 ("ipv4: use seqlock for nh_exceptions")
Reported-by: Jianlin Shi <jishi@redhat.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2017-11-17 14:27:06 +08:00 committed by David S. Miller
parent ecca8f88da
commit e39d524611
1 changed files with 2 additions and 3 deletions
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5
net/ipv4/route.c
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@ -678,10 +678,9 @@ static void update_or_create_fnhe(struct fib_nh *nh, __be32 daddr, __be32 gw,
if (fnhe) {
if (gw)
fnhe->fnhe_gw = gw;
if (pmtu) {
if (pmtu)
fnhe->fnhe_pmtu = pmtu;
fnhe->fnhe_expires = max(1UL, expires);
}
fnhe->fnhe_expires = max(1UL, expires);
/* Update all cached dsts too */
rt = rcu_dereference(fnhe->fnhe_rth_input);
if (rt)