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neighbour: confirm neigh entries when ARP packet is received

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[ Upstream commit f0e0d04413fcce9bc76388839099aee93cd0d33b ]

Update 'confirmed' timestamp when ARP packet is received. It shouldn't
affect locktime logic and anyway entry can be confirmed by any higher-layer
protocol. Thus it makes sense to confirm it when ARP packet is received.

Fixes: 77d7123342dc ("neighbour: update neigh timestamps iff update is effective")
Signed-off-by: Vasily Khoruzhick <vasilykh@arista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vasily Khoruzhick 2018-09-13 11:12:03 -07:00 • committed by Greg Kroah-Hartman
parent b8214c557c
commit c6e3864253
1 changed files with 8 additions and 5 deletions
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13
net/core/neighbour.c
View file

@ -1140,6 +1140,12 @@ int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new,
lladdr = neigh->ha;
}
/* Update confirmed timestamp for neighbour entry after we
* received ARP packet even if it doesn't change IP to MAC binding.
*/
if (new & NUD_CONNECTED)
neigh->confirmed = jiffies;
/* If entry was valid and address is not changed,
do not change entry state, if new one is STALE.
*/
@ -1163,15 +1169,12 @@ int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new,
}
}
/* Update timestamps only once we know we will make a change to the
/* Update timestamp only once we know we will make a change to the
* neighbour entry. Otherwise we risk to move the locktime window with
* noop updates and ignore relevant ARP updates.
*/
if (new != old || lladdr != neigh->ha) {
if (new & NUD_CONNECTED)
neigh->confirmed = jiffies;
if (new != old || lladdr != neigh->ha)
neigh->updated = jiffies;
}
if (new != old) {
neigh_del_timer(neigh);