net_device: add support for network device groups

Net devices can now be grouped, enabling simpler manipulation from
userspace. This patch adds a group field to the net_device structure, as
well as rtnetlink support to query and modify it.

Signed-off-by: Vlad Dogaru <ddvlad@rosedu.org>
Acked-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index d971346b0340..68a4627b74f5 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -75,6 +75,9 @@ struct wireless_dev;
 #define NET_RX_SUCCESS          0       /* keep 'em coming, baby */
 #define NET_RX_DROP             1       /* packet dropped */
 
+/* Initial net device group. All devices belong to group 0 by default. */
+#define INIT_NETDEV_GROUP       0
+
 /*
  * Transmit return codes: transmit return codes originate from three different
  * namespaces:
@@ -1153,6 +1156,9 @@ struct net_device {
 
         /* phy device may attach itself for hardware timestamping */
         struct phy_device *phydev;
+
+        /* group the device belongs to */
+        int group;
 };
 #define to_net_dev(d) container_of(d, struct net_device, dev)
 
@@ -1844,6 +1850,7 @@ extern int		dev_set_alias(struct net_device *, const char *, size_t);
 extern int              dev_change_net_namespace(struct net_device *,
                                                  struct net *, const char *);
 extern int              dev_set_mtu(struct net_device *, int);
+extern void             dev_set_group(struct net_device *, int);
 extern int              dev_set_mac_address(struct net_device *,
                                             struct sockaddr *);
 extern int              dev_hard_start_xmit(struct sk_buff *skb,