nexthop.h

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#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