From 1533e77315220dc1d5ec3bd6d9fe32e2aa0a74c0 Mon Sep 17 00:00:00 2001 From: Mark Bloch Date: Thu, 21 Jul 2016 11:52:55 +0300 Subject: [PATCH] net/bonding: Enforce active-backup policy for IPoIB bonds When using an IPoIB bond currently only active-backup mode is a valid use case and this commit strengthens it. Since commit 2ab82852a270 ("net/bonding: Enable bonding to enslave netdevices not supporting set_mac_address()") was introduced till 4.7-rc1, IPoIB didn't support the set_mac_address ndo, and hence the fail over mac policy always applied to IPoIB bonds. With the introduction of commit 492a7e67ff83 ("IB/IPoIB: Allow setting the device address"), that doesn't hold and practically IPoIB bonds are broken as of that. To fix it, lets go to fail over mac if the device doesn't support the ndo OR this is IPoIB device. As a by-product, this commit also prevents a stack corruption which occurred when trying to copy 20 bytes (IPoIB) device address to a sockaddr struct that has only 16 bytes of storage. Signed-off-by: Mark Bloch Signed-off-by: Or Gerlitz Signed-off-by: Saeed Mahameed Acked-by: Andy Gospodarek Signed-off-by: Jay Vosburgh Signed-off-by: David S. Miller --- drivers/net/bonding/bond_main.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index b571ed9fd63d..1f276fa30ba6 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -1422,7 +1422,16 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) return -EINVAL; } - if (slave_ops->ndo_set_mac_address == NULL) { + if (slave_dev->type == ARPHRD_INFINIBAND && + BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { + netdev_warn(bond_dev, "Type (%d) supports only active-backup mode\n", + slave_dev->type); + res = -EOPNOTSUPP; + goto err_undo_flags; + } + + if (!slave_ops->ndo_set_mac_address || + slave_dev->type == ARPHRD_INFINIBAND) { netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n"); if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && bond->params.fail_over_mac != BOND_FOM_ACTIVE) { -- GitLab