netdev - [PATCH net-next v2] bonding: deliver link-local packets with skb->dev set to link that packets arrived on

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Date:   Sun, 16 Apr 2017 12:02:18 -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 v2] bonding: deliver link-local packets with skb->dev set to link that packets arrived on

Bonding driver changes the skb->dev to the bonding-master before
passing the packet to stack for further processing. This, however
does not make sense for the link-local packets and it looses "the
link info" once its skb->dev is changed to bonding-master.  This
patch changes this behavior for link-local packets by not changing
the skb->dev to the bonding-master and maintaining it as it is,
i.e. the link on which the packet arrived.

Signed-off-by: Chonggang Li <chonggangli@...gle.com>
Signed-off-by: Mahesh Bandewar <maheshb@...gle.com>
Signed-off-by: Maciej Żenczykowski <maze@...gle.com>
---
Changes in v2:
  - Make the commit message more clearer.

 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..6bd3b50faf48 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)
 		}
 	}
 
+	/* don't change skb->dev for link-local packets */
+	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