net: introduce upper device lists

This lists are supposed to serve for storing pointers to all upper devices.
Eventually it will replace dev->master pointer which is used for
bonding, bridge, team but it cannot be used for vlan, macvlan where
there might be multiple upper present. In case the upper link is
replacement for dev->master, it is marked with "master" flag.

New upper device list resolves this limitation. Also, the information
stored in lists is used for preventing looping setups like
"bond->somethingelse->samebond"

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 0 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index c5031a45e185..e324601f48e8 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1174,6 +1174,8 @@ struct net_device {
                                           * which this device is member of.
                                           */
 
+        struct list_head        upper_dev_list; /* List of upper devices */
+
         /* Interface address info used in eth_type_trans() */
         unsigned char           *dev_addr;      /* hw address, (before bcast
                                                    because most packets are
@@ -2636,6 +2638,18 @@ extern int		netdev_max_backlog;
 extern int              netdev_tstamp_prequeue;
 extern int              weight_p;
 extern int              bpf_jit_enable;
+
+extern bool netdev_has_upper_dev(struct net_device *dev,
+                                 struct net_device *upper_dev);
+extern bool netdev_has_any_upper_dev(struct net_device *dev);
+extern struct net_device *netdev_master_upper_dev_get(struct net_device *dev);
+extern struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev);
+extern int netdev_upper_dev_link(struct net_device *dev,
+                                 struct net_device *upper_dev);
+extern int netdev_master_upper_dev_link(struct net_device *dev,
+                                        struct net_device *upper_dev);
+extern void netdev_upper_dev_unlink(struct net_device *dev,
+                                    struct net_device *upper_dev);
 extern int              netdev_set_master(struct net_device *dev, struct net_device *master);
 extern int netdev_set_bond_master(struct net_device *dev,
                                   struct net_device *master);