netdev - [PATCH net-next v2 3/3] macvlan: don't set the same mac address for non-passthru mode

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Message-ID: <1401969663-4464-4-git-send-email-dingtianhong@huawei.com>
Date:	Thu, 5 Jun 2014 20:01:03 +0800
From:	Ding Tianhong <dingtianhong@...wei.com>
To:	<kaber@...sh.net>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<vyasevic@...hat.com>, <makita.toshiaki@....ntt.co.jp>
CC:	<netdev@...r.kernel.org>
Subject: [PATCH net-next v2 3/3] macvlan: don't set the same mac address for non-passthru mode

The macvlan should have the same mac address only for passthru mode,
so the underlying device couldn't set a new address if it is in use
by macvlan for non-passthru mode, otherwise it will break the work
mechanism.

Signed-off-by: Ding Tianhong <dingtianhong@...wei.com>
---
 drivers/net/macvlan.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index c3a54a6..edf1a1c 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -1185,8 +1185,12 @@ static int macvlan_device_event(struct notifier_block *unused,
 		}
 		break;
 	case NETDEV_CHANGEADDR:
-		if (!port->passthru)
+		if (!port->passthru) {
+			if (macvlan_hash_lookup(port, dev->dev_addr))
+				return NOTIFY_BAD;
+
 			return NOTIFY_DONE;
+		}
 
 		vlan = list_first_entry_or_null(&port->vlans,
 						struct macvlan_dev,
-- 
1.8.0


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