sd-netlink: don't access type->type_system[_union] directly

Make sure we never access type->type_system or type->type_system_union
directly. This is an implementation detail of the type-system and we
should always use the accessors. Right now, they only exist for 2-level
accesses (type-system to type-system). This patch introduces the 1-level
accessors (type to type-system) and makes use of it.

This patch makes sure the proper assertions are in place, so we never
accidentally access sub-type-systems for non-nested/union types.

Note that this places hard-asserts on the accessors. This should be fine,
as we expect callers to only access sub type-systems if they *know*
they're dealing with nested types.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/libsystemd/sd-netlink/netlink-types.h b/src/libsystemd/sd-netlink/netlink-types.h
index 1bb1b21da9..74a59bb7c2 100644
--- a/src/libsystemd/sd-netlink/netlink-types.h
+++ b/src/libsystemd/sd-netlink/netlink-types.h
@@ -65,6 +65,8 @@ struct NLType {
         const NLTypeSystemUnion *type_system_union;
 };
 
+void type_get_type_system(const NLType *type, const NLTypeSystem **ret);
+void type_get_type_system_union(const NLType *type, const NLTypeSystemUnion **ret);
 int type_system_get_type(const NLTypeSystem *type_system, const NLType **ret, uint16_t type);
 int type_system_get_type_system(const NLTypeSystem *type_system, const NLTypeSystem **ret, uint16_t type);
 int type_system_get_type_system_union(const NLTypeSystem *type_system, const NLTypeSystemUnion **ret, uint16_t type);