net: introduce default neigh_construct/destroy ndo calls for L2 upper devices

L2 upper device needs to propagate neigh_construct/destroy calls down to
lower devices. Do this by defining default ndo functions and use them in
team, bond, bridge and vlan.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 48 insertions, 0 deletions

diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 86ae75b77390..c8f422c90856 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -790,6 +790,8 @@ static const struct net_device_ops vlan_netdev_ops = {
         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
 #endif
         .ndo_fix_features       = vlan_dev_fix_features,
+        .ndo_neigh_construct    = netdev_default_l2upper_neigh_construct,
+        .ndo_neigh_destroy      = netdev_default_l2upper_neigh_destroy,
         .ndo_fdb_add            = switchdev_port_fdb_add,
         .ndo_fdb_del            = switchdev_port_fdb_del,
         .ndo_fdb_dump           = switchdev_port_fdb_dump,
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index 0c39e0f6da09..8eecd0ec22f2 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -349,6 +349,8 @@ static const struct net_device_ops br_netdev_ops = {
         .ndo_add_slave           = br_add_slave,
         .ndo_del_slave           = br_del_slave,
         .ndo_fix_features        = br_fix_features,
+        .ndo_neigh_construct     = netdev_default_l2upper_neigh_construct,
+        .ndo_neigh_destroy       = netdev_default_l2upper_neigh_destroy,
         .ndo_fdb_add             = br_fdb_add,
         .ndo_fdb_del             = br_fdb_delete,
         .ndo_fdb_dump            = br_fdb_dump,
diff --git a/net/core/dev.c b/net/core/dev.c
index a4f3b0a9aeaf..b92d63bfde7a 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6087,6 +6087,50 @@ void netdev_lower_state_changed(struct net_device *lower_dev,
 }
 EXPORT_SYMBOL(netdev_lower_state_changed);
 
+int netdev_default_l2upper_neigh_construct(struct net_device *dev,
+                                           struct neighbour *n)
+{
+        struct net_device *lower_dev, *stop_dev;
+        struct list_head *iter;
+        int err;
+
+        netdev_for_each_lower_dev(dev, lower_dev, iter) {
+                if (!lower_dev->netdev_ops->ndo_neigh_construct)
+                        continue;
+                err = lower_dev->netdev_ops->ndo_neigh_construct(lower_dev, n);
+                if (err) {
+                        stop_dev = lower_dev;
+                        goto rollback;
+                }
+        }
+        return 0;
+
+rollback:
+        netdev_for_each_lower_dev(dev, lower_dev, iter) {
+                if (lower_dev == stop_dev)
+                        break;
+                if (!lower_dev->netdev_ops->ndo_neigh_destroy)
+                        continue;
+                lower_dev->netdev_ops->ndo_neigh_destroy(lower_dev, n);
+        }
+        return err;
+}
+EXPORT_SYMBOL_GPL(netdev_default_l2upper_neigh_construct);
+
+void netdev_default_l2upper_neigh_destroy(struct net_device *dev,
+                                          struct neighbour *n)
+{
+        struct net_device *lower_dev;
+        struct list_head *iter;
+
+        netdev_for_each_lower_dev(dev, lower_dev, iter) {
+                if (!lower_dev->netdev_ops->ndo_neigh_destroy)
+                        continue;
+                lower_dev->netdev_ops->ndo_neigh_destroy(lower_dev, n);
+        }
+}
+EXPORT_SYMBOL_GPL(netdev_default_l2upper_neigh_destroy);
+
 static void dev_change_rx_flags(struct net_device *dev, int flags)
 {
         const struct net_device_ops *ops = dev->netdev_ops;