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neigh: fix ARP retransmit timer guard

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In commit 19e16d220f ("neigh: support smaller retrans_time settting")
we add more accurate control for ARP and NS. But for ARP I forgot to
update the latest guard in neigh_timer_handler(), then the next
retransmit would be reset to jiffies + HZ/2 if we set the retrans_time
less than 500ms. Fix it by setting the time_before() check to HZ/100.

IPv6 does not have this issue.

Reported-by: Jianwen Ji <jiji@redhat.com>
Fixes: 19e16d220f ("neigh: support smaller retrans_time settting")
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hangbin Liu 2020-05-28 15:15:13 +08:00 committed by David S. Miller
parent f2b122d3d6
commit 96d10d5b19
1 changed files with 2 additions and 2 deletions
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4
net/core/neighbour.c
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@ -1082,8 +1082,8 @@ static void neigh_timer_handler(struct timer_list *t)
}
if (neigh->nud_state & NUD_IN_TIMER) {
if (time_before(next, jiffies + HZ/2))
next = jiffies + HZ/2;
if (time_before(next, jiffies + HZ/100))
next = jiffies + HZ/100;
if (!mod_timer(&neigh->timer, next))
neigh_hold(neigh);
}