sd-netlink: make NLType internal

If we extend NLType to support arrays and further extended types, we
really want to avoid hard-coding the type-layout outside of
netlink-types.c. We already avoid accessing nl_type->type_system outside
of netlink-types.c, extend this to also avoid accessing any other fields.

Provide accessor functions for nl_type->type and nl_type->size and then
move NLType away from the type-system header.

With this in place, follow-up patches can safely turn "type_system" and
"type_system_union" into a real "union { }", and then add another type for
arrays.

1 files changed, 17 insertions, 0 deletions

diff --git a/src/libsystemd/sd-netlink/netlink-types.c b/src/libsystemd/sd-netlink/netlink-types.c
index fe9e5f9826..7715ff8a44 100644
--- a/src/libsystemd/sd-netlink/netlink-types.c
+++ b/src/libsystemd/sd-netlink/netlink-types.c
@@ -39,6 +39,13 @@
 #include "netlink-types.h"
 #include "missing.h"
 
+struct NLType {
+        uint16_t type;
+        size_t size;
+        const NLTypeSystem *type_system;
+        const NLTypeSystemUnion *type_system_union;
+};
+
 static const NLTypeSystem rtnl_link_type_system;
 
 static const NLType rtnl_link_info_data_veth_types[VETH_INFO_MAX + 1] = {
@@ -460,6 +467,16 @@ const NLTypeSystem rtnl_type_system = {
         .types = rtnl_types,
 };
 
+uint16_t type_get_type(const NLType *type) {
+        assert(type);
+        return type->type;
+}
+
+size_t type_get_size(const NLType *type) {
+        assert(type);
+        return type->size;
+}
+
 void type_get_type_system(const NLType *nl_type, const NLTypeSystem **ret) {
         assert(nl_type);
         assert(ret);