netdev - [PATCH net-next] bonding: do not pass link-local packets to master-interface

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Message-Id: <20170414180022.124453-1-chonggangli@google.com>
Date:   Fri, 14 Apr 2017 11:00:22 -0700
From:   Chonggang Li <chonggangli@...gle.com>
To:     j.vosburgh@...il.com, andy@...yhouse.net, vfalico@...il.com,
        nikolay@...hat.com, edumazet@...gle.com, davem@...emloft.net
Cc:     netdev@...r.kernel.org, Chonggang Li <chonggangli@...gle.com>,
        Mahesh Bandewar <maheshb@...gle.com>,
        Maciej Żenczykowski <maze@...gle.com>
Subject: [PATCH net-next] bonding: do not pass link-local packets to master-interface

Previously link-local packets excluding LACP (which are handled by
the recv_probe) received on bond slave interfaces are delivered to
stack with bond-master device with RX_HANDLER_ANOTHER, however all
link-local packets are link specific and should be delivered with
exact same link/dev.

Signed-off-by: Chonggang Li <chonggangli@...gle.com>
Signed-off-by: Mahesh Bandewar <maheshb@...gle.com>
Signed-off-by: Maciej Żenczykowski <maze@...gle.com>
---
 drivers/net/bonding/bond_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 01e4a69af421..aeca3d8541b9 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1176,6 +1176,9 @@ static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
 		}
 	}
 
+	/* link-local packets should not be passed to master interface */
+	if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
+		return RX_HANDLER_PASS;
 	if (bond_should_deliver_exact_match(skb, slave, bond))
 		return RX_HANDLER_EXACT;
 
-- 
2.12.2.762.g0e3151a226-goog