*: 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/ldpd/ldp_zebra.c b/ldpd/ldp_zebra.c
index 884ae159be..251df73888 100644
--- a/ldpd/ldp_zebra.c
+++ b/ldpd/ldp_zebra.c
@@ -532,9 +532,32 @@ ldp_zebra_connected(struct zclient *zclient)
 
 extern struct zebra_privs_t ldpd_privs;
 
+static int ldp_ifp_create(struct interface *ifp)
+{
+	return 0;
+}
+
+static int ldp_ifp_up(struct interface *ifp)
+{
+	return 0;
+}
+
+static int ldp_ifp_down(struct interface *ifp)
+{
+	return 0;
+}
+
+static int ldp_ifp_destroy(struct interface *ifp)
+{
+	return 0;
+}
+
 void
 ldp_zebra_init(struct thread_master *master)
 {
+	if_zapi_callbacks(ldp_ifp_create, ldp_ifp_up,
+			  ldp_ifp_down, ldp_ifp_destroy);
+
 	/* Set default values. */
 	zclient = zclient_new(master, &zclient_options_default);
 	zclient_init(zclient, ZEBRA_ROUTE_LDP, 0, &ldpd_privs);