netdev - Re: [PATCH net V2] net/bonding: Enforce active-backup policy for IPoIB bonds

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Date:	Thu, 21 Jul 2016 07:39:50 -0700
From:	Jay Vosburgh <jay.vosburgh@...onical.com>
To:	Saeed Mahameed <saeedm@...lanox.com>
cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	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>
Subject: Re: [PATCH net V2] net/bonding: Enforce active-backup policy for IPoIB bonds

Saeed Mahameed <saeedm@...lanox.com> wrote:

>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>

Signed-off-by: Jay Vosburgh <jay.vosburgh@...onical.com>


>
>Changes from v0:
> - Set res to -EOPNOTSUPP before jumping to err_undo_flags.
>
> 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 a2afa3b..4d79819 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) {
>-- 
>2.8.0
>