[NET] rules: Unified rules dumping

Implements a unified, protocol independant rules dumping function
which is capable of both, dumping a specific protocol family or
all of them. This speeds up dumping as less lookups are required.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/net/rtnetlink.h b/include/net/rtnetlink.h
index dce7072bd28c..086fa9e89509 100644
--- a/include/net/rtnetlink.h
+++ b/include/net/rtnetlink.h
@@ -15,4 +15,12 @@ extern int	rtnl_unregister(int protocol, int msgtype);
 extern void     rtnl_unregister_all(int protocol);
 extern int      rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb);
 
+static inline int rtnl_msg_family(struct nlmsghdr *nlh)
+{
+        if (nlmsg_len(nlh) >= sizeof(struct rtgenmsg))
+                return ((struct rtgenmsg *) nlmsg_data(nlh))->rtgen_family;
+        else
+                return AF_UNSPEC;
+}
+
 #endif