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-rw-r--r--net/ipv6/ndisc.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index ed01f9a330d..0e0d6ce6902 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -952,6 +952,15 @@ static void ndisc_recv_na(struct sk_buff *skb)
if (neigh->nud_state & NUD_FAILED)
goto out;
+ /*
+ * Don't update the neighbor cache entry on a proxy NA from
+ * ourselves because either the proxied node is off link or it
+ * has already sent a NA to us.
+ */
+ if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) &&
+ pneigh_lookup(&nd_tbl, &msg->target, dev, 0))
+ goto out;
+
neigh_update(neigh, lladdr,
msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
NEIGH_UPDATE_F_WEAK_OVERRIDE|