babel: Clean babel related config on daemon stop

When deactivating babel no router babel and later re-enabling it router babel the previous configuration is still in place.

Steps to reproduce:

    Enable babel
    Configure babel
    Disable babel with "no router babel"
    Verify config

Expected correct behavior: No config present

Signed-off-by: Yaroslav Kholod <y.kholod@vyos.io>

babeld/babel_interface.c

@@ -35,7 +35,6 @@ DEFINE_MTYPE_STATIC(BABELD, BABEL_IF, "Babel Interface");
 
 static int babel_enable_if_lookup (const char *ifname);
 static int babel_enable_if_add (const char *ifname);
-static int babel_enable_if_delete (const char *ifname);
 static int interface_recalculate(struct interface *ifp);
 static int interface_reset(struct interface *ifp);
 static int babel_if_new_hook    (struct interface *ifp);
@@ -196,7 +195,7 @@ babel_enable_if_add (const char *ifname)
 }
 
 /* Delete interface from babel_enable_if. */
-static int
+int
 babel_enable_if_delete (const char *ifname)
 {
     int babel_enable_if_index;

babeld/babel_interface.h

@@ -117,5 +117,6 @@ int is_interface_ll_address(struct interface *ifp, const unsigned char *address)
 void babel_interface_close_all(void);
 extern int babel_enable_if_config_write (struct vty *);
 
+int babel_enable_if_delete (const char *ifname);
 
 #endif

babeld/babeld.c

@@ -301,6 +301,10 @@ babel_initial_noise(void)
 /* Delete all the added babel routes, make babeld only speak to zebra. */
 void babel_clean_routing_process(void)
 {
+    struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
+    struct interface *ifp = NULL;
+    int type = ZEBRA_ROUTE_ALL;
+
     flush_all_routes();
     babel_interface_close_all();
 
@@ -310,6 +314,17 @@ void babel_clean_routing_process(void)
     resend_delay = BABEL_DEFAULT_RESEND_DELAY;
     change_smoothing_half_life(BABEL_DEFAULT_SMOOTHING_HALF_LIFE);
 
+    /* Clean babel network interfaces */
+    FOR_ALL_INTERFACES(vrf, ifp) {
+        babel_enable_if_delete(ifp->name);
+    }
+
+    /* Disable babel redistribution */
+    for (type = 0; type < ZEBRA_ROUTE_MAX; type++) {
+        zclient_redistribute (ZEBRA_REDISTRIBUTE_DELETE, zclient, family2afi(AF_INET), type, 0, VRF_DEFAULT);
+        zclient_redistribute (ZEBRA_REDISTRIBUTE_DELETE, zclient, family2afi(AF_INET6), type, 0, VRF_DEFAULT);
+    }
+
     /* cancel events */
     event_cancel(&babel_routing_process->t_read);
     event_cancel(&babel_routing_process->t_update);