net: dev: add generic protodown handler

Introduce dev_change_proto_down_generic, a generic ndo_change_proto_down
implementation, which sets the netdev carrier state according to proto_down.

This adds the ability to set protodown on vxlan and macvlan devices in a
generic way for use by control protocols like VRRPD.

Signed-off-by: Andy Roulin <aroulin@cumulusnetworks.com>
Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 19 insertions, 0 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 8a0da95ff4cc..2b67f2aa59dd 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -7954,6 +7954,25 @@ int dev_change_proto_down(struct net_device *dev, bool proto_down)
 }
 EXPORT_SYMBOL(dev_change_proto_down);
 
+/**
+ *      dev_change_proto_down_generic - generic implementation for
+ *      ndo_change_proto_down that sets carrier according to
+ *      proto_down.
+ *
+ *      @dev: device
+ *      @proto_down: new value
+ */
+int dev_change_proto_down_generic(struct net_device *dev, bool proto_down)
+{
+        if (proto_down)
+                netif_carrier_off(dev);
+        else
+                netif_carrier_on(dev);
+        dev->proto_down = proto_down;
+        return 0;
+}
+EXPORT_SYMBOL(dev_change_proto_down_generic);
+
 u32 __dev_xdp_query(struct net_device *dev, bpf_op_t bpf_op,
                     enum bpf_netdev_command cmd)
 {