netdev - [PATCH net] vlan: Propagate MAC address changes properly

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <572489C5.3020502@brocade.com>
Date:	Sat, 30 Apr 2016 11:32:37 +0100
From:	Mike Manning <mmanning@...cade.com>
To:	<netdev@...r.kernel.org>
Subject: [PATCH net] vlan: Propagate MAC address changes properly

The MAC address of the physical interface is only copied to the VLAN
when it is first created, resulting in an inconsistency after MAC
address changes of only newly created VLANs having an up-to-date MAC.

Continuing to inherit the MAC address unless explicitly changed for
the VLAN allows IPv6 EUI64 addresses for the VLAN to reflect the change
and thus for DAD to behave as expected for the given MAC.

Signed-off-by: Mike Manning <mmanning@...cade.com>
---
 net/8021q/vlan.c |   17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index d2cd9de..2f57cf2 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -293,15 +293,15 @@ static void vlan_sync_address(struct net_device *dev,
 
 	/* vlan address was different from the old address and is equal to
 	 * the new address */
-	if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
+	if ((vlandev->flags & IFF_UP) &&
+	    !ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 	    ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 		dev_uc_del(dev, vlandev->dev_addr);
 
-	/* vlan address was equal to the old address and is different from
+	/* vlan address was equal to the old address so now also inherit
 	 * the new address */
-	if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
-	    !ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
-		dev_uc_add(dev, vlandev->dev_addr);
+	if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr))
+		ether_addr_copy(vlandev->dev_addr, dev->dev_addr);
 
 	ether_addr_copy(vlan->real_dev_addr, dev->dev_addr);
 }
@@ -389,13 +389,8 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 
 	case NETDEV_CHANGEADDR:
 		/* Adjust unicast filters on underlying device */
-		vlan_group_for_each_dev(grp, i, vlandev) {
-			flgs = vlandev->flags;
-			if (!(flgs & IFF_UP))
-				continue;
-
+		vlan_group_for_each_dev(grp, i, vlandev)
 			vlan_sync_address(dev, vlandev);
-		}
 		break;
 
 	case NETDEV_CHANGEMTU:
-- 
1.7.10.4