cache: event_filter() cache operation to filter notifications

Certain notifications need to be filtered out and should not be applied to
a cache when a cache is handled by a cache manager.

1 files changed, 7 insertions, 0 deletions

diff --git a/include/netlink/cache-api.h b/include/netlink/cache-api.h
index efae2ed..1b3d099 100644
--- a/include/netlink/cache-api.h
+++ b/include/netlink/cache-api.h
@@ -201,6 +201,13 @@ struct nl_cache_ops
 	int   (*co_msg_parser)(struct nl_cache_ops *, struct sockaddr_nl *,
 			       struct nlmsghdr *, struct nl_parser_param *);
 
+	/**
+	 * Called whenever a notification has been parsed into an object and
+	 * is considered for inclusion into a cache. Must return NL_SKIP if
+	 * the object should not be included in the cache.
+	 */
+	int   (*co_event_filter)(struct nl_cache *, struct nl_object *obj);
+
 	/** Object operations */
 	struct nl_object_ops *	co_obj_ops;