rib_subscription_cb_t
rib_subscription_cb_t *f, void *arg, enum rib_subscription_type type,
rib_subscription_cb_t *f, void *arg, enum rib_subscription_type type,
rib_subscription_cb_t *f, void *arg, enum rib_subscription_type type);
rib_subscribe_internal(struct rib_head *rnh, rib_subscription_cb_t *f, void *arg,
rib_subscribe_locked(struct rib_head *rnh, rib_subscription_cb_t *f, void *arg,
rib_subscription_cb_t *func;
allocate_subscription(rib_subscription_cb_t *f, void *arg,
rib_subscribe(uint32_t fibnum, int family, rib_subscription_cb_t *f, void *arg,