#ifndef __NET_NEXTHOP_H
  #define __NET_NEXTHOP_H
  
  #include <linux/rtnetlink.h>
  #include <net/netlink.h>
  
  static inline int rtnh_ok(const struct rtnexthop *rtnh, int remaining)
  {
  	return remaining >= sizeof(*rtnh) &&
  	       rtnh->rtnh_len >= sizeof(*rtnh) &&
  	       rtnh->rtnh_len <= remaining;
  }
  
  static inline struct rtnexthop *rtnh_next(const struct rtnexthop *rtnh,
                                           int *remaining)
  {
  	int totlen = NLA_ALIGN(rtnh->rtnh_len);
  
  	*remaining -= totlen;
  	return (struct rtnexthop *) ((char *) rtnh + totlen);
  }
  
  static inline struct nlattr *rtnh_attrs(const struct rtnexthop *rtnh)
  {
  	return (struct nlattr *) ((char *) rtnh + NLA_ALIGN(sizeof(*rtnh)));
  }
  
  static inline int rtnh_attrlen(const struct rtnexthop *rtnh)
  {
  	return rtnh->rtnh_len - NLA_ALIGN(sizeof(*rtnh));
  }
  
  #endif