netdev - [RFC 2/6] genetlink: add genlmsg_parse

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Message-Id: <20190321220504.7642-3-johannes@sipsolutions.net>
Date:   Thu, 21 Mar 2019 23:05:00 +0100
From:   Johannes Berg <johannes@...solutions.net>
To:     netdev@...r.kernel.org
Cc:     David Ahern <dsa@...ulusnetworks.com>,
        Johannes Berg <johannes.berg@...el.com>
Subject: [RFC 2/6] genetlink: add genlmsg_parse_strict()

From: Johannes Berg <johannes.berg@...el.com>

Signed-off-by: Johannes Berg <johannes.berg@...el.com>
---
 include/net/genetlink.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/include/net/genetlink.h b/include/net/genetlink.h
index 6850c7b1a3a6..4a25c341244c 100644
--- a/include/net/genetlink.h
+++ b/include/net/genetlink.h
@@ -183,6 +183,25 @@ static inline int genlmsg_parse(const struct nlmsghdr *nlh,
 			   policy, extack);
 }
 
+/**
+ * genlmsg_parse_strict - strictly parse attributes of a genetlink message
+ * @nlh: netlink message header
+ * @family: genetlink message family
+ * @tb: destination array with maxtype+1 elements
+ * @maxtype: maximum attribute type to be expected
+ * @policy: validation policy
+ * @extack: extended ACK report struct
+ */
+static inline int genlmsg_parse_strict(const struct nlmsghdr *nlh,
+				       const struct genl_family *family,
+				       struct nlattr *tb[], int maxtype,
+				       const struct nla_policy *policy,
+				       struct netlink_ext_ack *extack)
+{
+	return nlmsg_parse_strict(nlh, family->hdrsize + GENL_HDRLEN, tb,
+				  maxtype, policy, extack);
+}
+
 /**
  * genl_dump_check_consistent - check if sequence is consistent and advertise if not
  * @cb: netlink callback structure that stores the sequence number
-- 
2.17.2