[Netlink]: add nla_validate_nested()

Add a new function, nla_validate_nested(), to validate nested Netlink
attributes.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 19 insertions, 0 deletions

diff --git a/include/net/netlink.h b/include/net/netlink.h
index 2897a73f81eb..4ab68a7a636a 100644
--- a/include/net/netlink.h
+++ b/include/net/netlink.h
@@ -146,6 +146,7 @@
  *   nla_ok(nla, remaining)             does nla fit into remaining bytes?
  *   nla_next(nla, remaining)           get next netlink attribute
  *   nla_validate()                     validate a stream of attributes
+ *   nla_validate_nested()              validate a stream of nested attributes
  *   nla_find()                         find attribute in stream of attributes
  *   nla_find_nested()                  find attribute in nested attributes
  *   nla_parse()                        parse and validate stream of attrs
@@ -951,6 +952,24 @@ static inline int nla_nest_cancel(struct sk_buff *skb, struct nlattr *start)
 }
 
 /**
+ * nla_validate_nested - Validate a stream of nested attributes
+ * @start: container attribute
+ * @maxtype: maximum attribute type to be expected
+ * @policy: validation policy
+ *
+ * Validates all attributes in the nested attribute stream against the
+ * specified policy. Attributes with a type exceeding maxtype will be
+ * ignored. See documenation of struct nla_policy for more details.
+ *
+ * Returns 0 on success or a negative error code.
+ */
+static inline int nla_validate_nested(struct nlattr *start, int maxtype,
+                                      struct nla_policy *policy)
+{
+        return nla_validate(nla_data(start), nla_len(start), maxtype, policy);
+}
+
+/**
  * nla_for_each_attr - iterate over a stream of attributes
  * @pos: loop counter, set to current attribute
  * @head: head of attribute stream