int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *start)
{
	struct rtattr *nest = (void *)start + NLMSG_ALIGN(start->rta_len);

	start->rta_len = (void *)NLMSG_TAIL(n) - (void *)start;
	addattr_nest_end(n, nest);
	return n->nlmsg_len;
}