netdev - [PATCH net] net/bonding: Enforce active-backup policy for IPoIB bonds

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Message-Id: <1469025860-15690-1-git-send-email-saeedm@mellanox.com>
Date:	Wed, 20 Jul 2016 17:44:20 +0300
From:	Saeed Mahameed <saeedm@...lanox.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, Jay Vosburgh <j.vosburgh@...il.com>,
	Veaceslav Falico <vfalico@...il.com>,
	Andy Gospodarek <gospo@...ulusnetworks.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Jiri Pirko <jiri@...lanox.com>,
	Doug Ledford <dledford@...hat.com>,
	Mark Bloch <markb@...lanox.com>,
	Saeed Mahameed <saeedm@...lanox.com>
Subject: [PATCH net] net/bonding: Enforce active-backup policy for IPoIB bonds

From: Mark Bloch <markb@...lanox.com>

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 <markb@...lanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
 drivers/net/bonding/bond_main.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index a2afa3b..ccd4003 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1422,7 +1422,15 @@ 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);
+		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) {
-- 
2.8.0