*: 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, 2 insertions, 0 deletions

diff --git a/pbrd/pbr_main.c b/pbrd/pbr_main.c
index 246d836acf..bb92703ae4 100644
--- a/pbrd/pbr_main.c
+++ b/pbrd/pbr_main.c
@@ -166,6 +166,8 @@ int main(int argc, char **argv, char **envp)
 	access_list_init();
 	pbr_nht_init();
 	pbr_map_init();
+	if_zapi_callbacks(pbr_ifp_create, pbr_ifp_up,
+			  pbr_ifp_down, pbr_ifp_destroy);
 	pbr_zebra_init();
 	pbr_vty_init();