From: Felix Fietkau <nbd@nbd.name>
Date: Fri, 7 Jul 2017 17:18:54 +0200
Subject: bridge: only accept EAP locally

When bridging, do not forward EAP frames to other ports, only deliver
them locally, regardless of the state.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
[add disable_eap_hack sysfs attribute]
Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>
---

--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -103,10 +103,14 @@ int br_handle_frame_finish(struct net *n
 		}
 	}
 
+	BR_INPUT_SKB_CB(skb)->brdev = br->dev;
+
+	if (skb->protocol == htons(ETH_P_PAE) && !br->disable_eap_hack)
+		return br_pass_frame_up(skb);
+
 	if (state == BR_STATE_LEARNING)
 		goto drop;
 
-	BR_INPUT_SKB_CB(skb)->brdev = br->dev;
 	BR_INPUT_SKB_CB(skb)->src_port_isolated = !!(p->flags & BR_ISOLATED);
 
 	if (IS_ENABLED(CONFIG_INET) &&
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -402,6 +402,8 @@ struct net_bridge {
 	u16				group_fwd_mask;
 	u16				group_fwd_mask_required;
 
+	bool				disable_eap_hack;
+
 	/* STP */
 	bridge_id			designated_root;
 	bridge_id			bridge_id;