net: bridge: add no_linklocal_learn bool option
Use the new boolopt API to add an option which disables learning from
link-local packets. The default is kept as before and learning is
enabled. This is a simple map from a boolopt bit to a bridge private
flag that is tested before learning.
v2: pass NULL for extack via sysfs
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 3ddca11..5ea7e56 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -188,7 +188,9 @@ static void __br_handle_local_finish(struct sk_buff *skb)
u16 vid = 0;
/* check if vlan is allowed, to avoid spoofing */
- if (p->flags & BR_LEARNING && br_should_learn(p, skb, &vid))
+ if ((p->flags & BR_LEARNING) &&
+ !br_opt_get(p->br, BROPT_NO_LL_LEARN) &&
+ br_should_learn(p, skb, &vid))
br_fdb_update(p->br, p, eth_hdr(skb)->h_source, vid, false);
}