kernel-ark/include/net/rtnetlink.h

#ifndef __NET_RTNETLINK_H
#define __NET_RTNETLINK_H

#include <linux/rtnetlink.h>
#include <net/netlink.h>

typedef int (*rtnl_doit_func)(struct sk_buff *, struct nlmsghdr *, void *);
typedef int (*rtnl_dumpit_func)(struct sk_buff *, struct netlink_callback *);

extern int	__rtnl_register(int protocol, int msgtype,
				rtnl_doit_func, rtnl_dumpit_func);
extern void	rtnl_register(int protocol, int msgtype,
			      rtnl_doit_func, rtnl_dumpit_func);
extern int	rtnl_unregister(int protocol, int msgtype);
extern void	rtnl_unregister_all(int protocol);

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