Commit 4fe5d5c0 authored by Paul Moore's avatar Paul Moore Committed by David S. Miller
Browse files

[Netlink]: add nla_validate_nested() 



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

Signed-off-by: default avatarPaul Moore <paul.moore@hp.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 22acb19a

include/net/netlink.h

+19 −0
Original line number Diff line number Diff line
@@ -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
@@ -950,6 +951,24 @@ static inline int nla_nest_cancel(struct sk_buff *skb, struct nlattr *start) 
	return nlmsg_trim(skb, 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