Revert "neighbour: force neigh_invalidate when NUD_FAILED update is from admin"

roopa-prabhu · davem330 · commit d2fb4fb8ee91 · 2018-10-20T22:25:01.000-07:00
This reverts commit 8e32628. This patch results in unnecessary netlink notification when one tries to delete a neigh entry already in NUD_FAILED state. Found this with a buggy app that tries to delete a NUD_FAILED entry repeatedly. While the notification issue can be fixed with more checks, adding more complexity here seems unnecessary. Also, recent tests with other changes in the neighbour code have shown that the INCOMPLETE and PROBE checks are good enough for the original issue. Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
@@ -1148,8 +1148,7 @@ 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)) ||
-		     (flags & NEIGH_UPDATE_F_ADMIN)) &&
+		if ((old & (NUD_INCOMPLETE | NUD_PROBE)) &&
 		    (new & NUD_FAILED)) {
 			neigh_invalidate(neigh);
 			notify = 1;
