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bonding: allow nesting of bonding device

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The commit 3c9ef511b9 ("bonding: avoid adding slave device with
IFF_MASTER flag") fix a crash when add slave device with IFF_MASTER,
but it rejects the scenario of nested bonding device.

As Eric Dumazet described: since there indeed is a usage scenario about
nesting bonding, we should not break it.

So we add a new judgment condition to allow nesting of bonding device.

Fixes: 3c9ef511b9 ("bonding: avoid adding slave device with IFF_MASTER flag")
Suggested-by: Jay Vosburgh <jay.vosburgh@canonical.com>
Signed-off-by: Di Zhu <zhudi21@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Di Zhu 2021-06-23 11:21:08 +08:00 committed by David S. Miller
parent 7c2becf796
commit 4d293fe1c6
1 changed files with 3 additions and 1 deletions
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4
drivers/net/bonding/bond_main.c
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@ -1601,7 +1601,9 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
int link_reporting;
int res = 0, i;
if (slave_dev->flags & IFF_MASTER) {
if (slave_dev->flags & IFF_MASTER &&
!netif_is_bond_master(slave_dev)) {
NL_SET_ERR_MSG(extack, "Device with IFF_MASTER cannot be enslaved");
netdev_err(bond_dev,
"Error: Device with IFF_MASTER cannot be enslaved\n");
return -EPERM;