*: Add infrastructure to support zapi interface callbacks

Start the conversion to allow zapi interface callbacks to be
controlled like vrf creation/destruction/change callbacks.

This will allow us to consolidate control into the interface.c
instead of having each daemon read the stream and react accordingly.
This will hopefully reduce a bunch of cut-n-paste stuff

Create 4 new callback functions that will be controlled by
lib/if.c

create -> A upper level protocol receives an interface creation event
The ifp is brand spanking newly created in the system.
up -> A upper level protocol receives a interface up event
This means the interface is up and ready to go.
down -> A upper level protocol receives a interface down
destroy -> A upper level protocol receives a destroy event
This means to delete the pointers associated with it.

At this point this is just boilerplate setup for future commits.
There is no new functionality.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/vrrpd/vrrp_zebra.c b/vrrpd/vrrp_zebra.c
index 72b77c1313..0844b90266 100644
--- a/vrrpd/vrrp_zebra.c
+++ b/vrrpd/vrrp_zebra.c
@@ -236,8 +236,31 @@ int vrrp_zclient_send_interface_protodown(struct interface *ifp, bool down)
 						down);
 }
 
+int vrrp_ifp_create(struct interface *ifp)
+{
+	return 0;
+}
+
+int vrrp_ifp_up(struct interface *ifp)
+{
+	return 0;
+}
+
+int vrrp_ifp_down(struct interface *ifp)
+{
+	return 0;
+}
+
+int vrrp_ifp_destroy(struct interface *ifp)
+{
+	return 0;
+}
+
 void vrrp_zebra_init(void)
 {
+	if_zapi_callbacks(vrrp_ifp_create, vrrp_ifp_up,
+			  vrrp_ifp_down, vrrp_ifp_destroy);
+
 	/* Socket for receiving updates from Zebra daemon */
 	zclient = zclient_new(master, &zclient_options_default);