#define NL_POLICY_FOR(TYPE) \
.type = NL_A_UNSPEC, .min_len = sizeof(TYPE), .max_len = sizeof(TYPE)
+bool nl_attr_validate(const struct nlattr *, const struct nl_policy *);
+
bool nl_policy_parse(const struct ofpbuf *, size_t offset,
const struct nl_policy[],
struct nlattr *[], size_t n_attrs);