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rtnetlink: allow to register ops without ops->setup set

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So far, it is assumed that ops->setup is filled up. But there might be
case that ops might make sense even without ->setup. In that case,
forbid to newlink and dellink.

This allows to register simple rtnl link ops containing only ->kind.
That allows consistent way of passing device kind (either device-kind or
slave-kind) to userspace.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2014-06-26 09:58:25 +02:00 committed by David S. Miller
parent 9bf2b8c280
commit b0ab2fabb5
2 changed files with 11 additions and 3 deletions
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2
net/core/dev.c
View File

@ -7091,7 +7091,7 @@ static void __net_exit default_device_exit_batch(struct list_head *net_list)
rtnl_lock_unregistering(net_list);
list_for_each_entry(net, net_list, exit_list) {
for_each_netdev_reverse(net, dev) {
if (dev->rtnl_link_ops)
if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink)
dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
else
unregister_netdevice_queue(dev, &dev_kill_list);

12
net/core/rtnetlink.c
View File

@ -299,7 +299,12 @@ int __rtnl_link_register(struct rtnl_link_ops *ops)
if (rtnl_link_ops_get(ops->kind))
return -EEXIST;
if (!ops->dellink)
/* The check for setup is here because if ops
* does not have that filled up, it is not possible
* to use the ops for creating device. So do not
* fill up dellink as well. That disables rtnl_dellink.
*/
if (ops->setup && !ops->dellink)
ops->dellink = unregister_netdevice_queue;
list_add_tail(&ops->list, &link_ops);
@ -1777,7 +1782,7 @@ static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
return -ENODEV;
ops = dev->rtnl_link_ops;
if (!ops)
if (!ops || !ops->dellink)
return -EOPNOTSUPP;
ops->dellink(dev, &list_kill);
@ -2038,6 +2043,9 @@ replay:
return -EOPNOTSUPP;
}
if (!ops->setup)
return -EOPNOTSUPP;
if (!ifname[0])
snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);