+ * nla_parse_nested_compat - parse nested compat attributes
+ * @tb: destination array with maxtype+1 elements
+ * @maxtype: maximum attribute type to be expected
+ * @nla: attribute containing the nested attributes
+ * @data: pointer to point to contained structure
+ * @len: length of contained structure
+ * @policy: validation policy
+ *
+ * Parse a nested compat attribute. The compat attribute contains a structure
+ * and optionally a set of nested attributes. On success the data pointer
+ * points to the nested data and tb contains the parsed attributes
+ * (see nla_parse).
+ */
+static inline int __nla_parse_nested_compat(struct nlattr *tb[], int maxtype,
+ struct nlattr *nla,
+ const struct nla_policy *policy,
+ int len)
+{
+ if (nla_len(nla) < len)
+ return -1;
+ if (nla_len(nla) >= NLA_ALIGN(len) + sizeof(struct nlattr))
+ return nla_parse_nested(tb, maxtype,
+ nla_data(nla) + NLA_ALIGN(len),
+ policy);
+ memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1));
+ return 0;
+}
+
+#define nla_parse_nested_compat(tb, maxtype, nla, policy, data, len) \
+({ data = nla_len(nla) >= len ? nla_data(nla) : NULL; \
+ __nla_parse_nested_compat(tb, maxtype, nla, policy, len); })
+/**
+ * nla_put_u8 - Add a u8 netlink attribute to a socket buffer