On Wed, 2022-08-24 at 19:41 -0700, Jakub Kicinski wrote:

+ * @miss_type: attribute type which was missing
+ * @miss_nest: nest missing an attribute (NULL if missing top level attr)

nit: maybe use %NULL for appropriate formatting in generated
documentation

 	const char *_msg;
 	const struct nlattr *bad_attr;
 	const struct nla_policy *policy;
+	const void *miss_nest;

Can be 'const struct nlattr *' now, no? No longer points to a random
header.

johannes