[Patch 4/8] Utilities for genetlink usage

[Shailabh Nagar <nagar@watson.ibm.com>]

genetlink-utils.patch

Two utilities for simplifying usage of NETLINK_GENERIC
interface.

Signed-off-by: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Shailabh Nagar <nagar@watson.ibm.com>

 include/net/genetlink.h |   20 ++++++++++++++++++++
 1 files changed, 20 insertions(+)

Index: linux-2.6.17-rc1/include/net/genetlink.h
===================================================================
--- linux-2.6.17-rc1.orig/include/net/genetlink.h	2006-04-21 19:39:29.000000000 -0400
+++ linux-2.6.17-rc1/include/net/genetlink.h	2006-04-21 20:29:19.000000000 -0400
@@ -150,4 +150,24 @@ static inline int genlmsg_unicast(struct
 	return nlmsg_unicast(genl_sock, skb, pid);
 }

+/**
+ * gennlmsg_data - head of message payload
+ * @gnlh: genetlink messsage header
+ */
+static inline void *genlmsg_data(const struct genlmsghdr *gnlh)
+{
+       return ((unsigned char *) gnlh + GENL_HDRLEN);
+}
+
+/**
+ * genlmsg_len - length of message payload
+ * @gnlh: genetlink message header
+ */
+static inline int genlmsg_len(const struct genlmsghdr *gnlh)
+{
+       struct nlmsghdr *nlh = (struct nlmsghdr *)((unsigned char *)gnlh -
+                                                   NLMSG_HDRLEN);
+       return (nlh->nlmsg_len - GENL_HDRLEN - NLMSG_HDRLEN);
+}
+
 #endif	/* __NET_GENERIC_NETLINK_H */