rtnetlink: implement setting of master device

This patch allows userspace to enslave/release slave devices via netlink
interface using IFLA_MASTER. This introduces generic way to add/remove
underling devices.

Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 5a42b1003767..d08ef6538579 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -783,6 +783,14 @@ struct netdev_tc_txq {
  *      Set hardware filter for RFS.  rxq_index is the target queue index;
  *      flow_id is a flow ID to be passed to rps_may_expire_flow() later.
  *      Return the filter ID on success, or a negative error code.
+ *
+ *      Slave management functions (for bridge, bonding, etc). User should
+ *      call netdev_set_master() to set dev->master properly.
+ * int (*ndo_add_slave)(struct net_device *dev, struct net_device *slave_dev);
+ *      Called to make another netdev an underling.
+ *
+ * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev);
+ *      Called to release previously enslaved netdev.
  */
 #define HAVE_NET_DEVICE_OPS
 struct net_device_ops {
@@ -862,6 +870,10 @@ struct net_device_ops {
                                                      u16 rxq_index,
                                                      u32 flow_id);
 #endif
+        int                     (*ndo_add_slave)(struct net_device *dev,
+                                                 struct net_device *slave_dev);
+        int                     (*ndo_del_slave)(struct net_device *dev,
+                                                 struct net_device *slave_dev);
 };
 
 /*