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neighbour: force neigh_invalidate when NUD_FAILED update is from admin

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In systems where neigh gc thresh holds are set to high values,
admin deleted neigh entries (eg ip neigh flush or ip neigh del) can
linger around in NUD_FAILED state for a long time until periodic gc kicks
in. This patch forces neigh_invalidate when NUD_FAILED neigh_update is
from an admin.

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Roopa Prabhu 2018-06-25 20:32:53 -07:00 committed by David S. Miller
parent b1a5046b24
commit 8e326289e3
1 changed files with 2 additions and 1 deletions
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3
net/core/neighbour.c
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@ -1148,7 +1148,8 @@ int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new,
neigh->nud_state = new;
err = 0;
notify = old & NUD_VALID;
if ((old & (NUD_INCOMPLETE | NUD_PROBE)) &&
if (((old & (NUD_INCOMPLETE | NUD_PROBE)) ||
(flags & NEIGH_UPDATE_F_ADMIN)) &&
(new & NUD_FAILED)) {
neigh_invalidate(neigh);
notify = 1;