Function add_route_nhop

freebsd/net/route/route_ctl.c:1053–1092

* Insert @rt with nhop data from @rnd_new to @rnh. * Returns 0 on success and stores operation results in @rc. */

 * Returns 0 on success and stores operation results in @rc.
 */
static int
add_route_nhop(struct rib_head *rnh, struct rtentry *rt,
    struct rt_addrinfo *info, struct route_nhop_data *rnd,
    struct rib_cmd_info *rc)
{
	struct sockaddr *ndst, *netmask;
	struct radix_node *rn;
	int error = 0;

	RIB_WLOCK_ASSERT(rnh);

	ndst = (struct sockaddr *)rt_key(rt);
	netmask = info->rti_info[RTAX_NETMASK];

	rt->rt_nhop = rnd->rnd_nhop;
	rt->rt_weight = rnd->rnd_weight;
	rn = rnh->rnh_addaddr(ndst, netmask, &rnh->head, rt->rt_nodes);

	if (rn != NULL) {
		if (rt->rt_expire > 0)
			tmproutes_update(rnh, rt);

		/* Finalize notification */
		rnh->rnh_gen++;
		rnh->rnh_prefixes++;

		rc->rc_cmd = RTM_ADD;
		rc->rc_rt = rt;
		rc->rc_nh_old = NULL;
		rc->rc_nh_new = rnd->rnd_nhop;
		rc->rc_nh_weight = rnd->rnd_weight;

		rib_notify(rnh, RIB_NOTIFY_IMMEDIATE, rc);
	} else {
		/* Existing route or memory allocation failure */
		error = EEXIST;
	}

	return (error);
}

/*
 * Switch @rt nhop/weigh to the ones specified in @rnd.