[PATCH 3.14 59/84] bonding: correct the MAC address for "follow" fail_over_mac policy

From: Greg Kroah-Hartman
Date: Tue Sep 29 2015 - 11:25:18 EST

3.14-stable review patch. If anyone has any objections, please let me know.


From: dingtianhong <dingtianhong@xxxxxxxxxx>

[ Upstream commit a951bc1e6ba58f11df5ed5ddc41311e10f5fd20b ]

The "follow" fail_over_mac policy is useful for multiport devices that
either become confused or incur a performance penalty when multiple
ports are programmed with the same MAC address, but the same MAC
address still may happened by this steps for this policy:

1) echo +eth0 > /sys/class/net/bond0/bonding/slaves
bond0 has the same mac address with eth0, it is MAC1.

2) echo +eth1 > /sys/class/net/bond0/bonding/slaves
eth1 is backup, eth1 has MAC2.

3) ifconfig eth0 down
eth1 became active slave, bond will swap MAC for eth0 and eth1,
so eth1 has MAC1, and eth0 has MAC2.

4) ifconfig eth1 down
there is no active slave, and eth1 still has MAC1, eth2 has MAC2.

5) ifconfig eth0 up
the eth0 became active slave again, the bond set eth0 to MAC1.

Something wrong here, then if you set eth1 up, the eth0 and eth1 will have the same
MAC address, it will break this policy for ACTIVE_BACKUP mode.

This patch will fix this problem by finding the old active slave and
swap them MAC address before change active slave.

Signed-off-by: Ding Tianhong <dingtianhong@xxxxxxxxxx>
Tested-by: Nikolay Aleksandrov <nikolay@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
drivers/net/bonding/bond_main.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -636,6 +636,23 @@ static void bond_set_dev_addr(struct net
call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);

+static struct slave *bond_get_old_active(struct bonding *bond,
+ struct slave *new_active)
+ struct slave *slave;
+ struct list_head *iter;
+ bond_for_each_slave(bond, slave, iter) {
+ if (slave == new_active)
+ continue;
+ if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
+ return slave;
+ }
+ return NULL;
* bond_do_fail_over_mac
@@ -672,6 +689,9 @@ static void bond_do_fail_over_mac(struct


+ if (!old_active)
+ old_active = bond_get_old_active(bond, new_active);
if (old_active) {
memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
memcpy(saddr.sa_data, old_active->dev->dev_addr,

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