vxlan: dont migrate permanent fdb entries during learn

BugLink: http://bugs.launchpad.net/bugs/1765010

[ Upstream commit e0090a9e ]

This patch fixes vxlan_snoop to not move permanent fdb entries
on learn events. This is consistent with the bridge fdb
handling of permanent entries.

Fixes: 26a41ae6 ("vxlan: only migrate dynamic FDB entries")
Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Juerg Haefliger <juergh@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

drivers/net/vxlan.c

@@ -1124,7 +1124,7 @@ static bool vxlan_snoop(struct net_device *dev,
 			return false;
 
 		/* Don't migrate static entries, drop packets */
-		if (f->state & NUD_NOARP)
+		if (f->state & (NUD_PERMANENT | NUD_NOARP))
 			return true;
 
 		if (net_ratelimit())