Function expire_flow

freebsd/netgraph/netflow/netflow.c:225–277

* The flow is over. Call export_add() and free it. If datagram is * full, then call export_send(). */

 * full, then call export_send().
 */
static void
expire_flow(priv_p priv, fib_export_p fe, struct flow_entry *fle, int flags)
{
	struct netflow_export_item exp;
	uint16_t version = fle->f.version;

	if ((priv->export != NULL) && (version == IPVERSION)) {
		exp.item = get_export_dgram(priv, fe);
		if (exp.item == NULL) {
			priv->nfinfo_export_failed++;
			if (priv->export9 != NULL)
				priv->nfinfo_export9_failed++;
			/* fle definitely contains IPv4 flow. */
			uma_zfree_arg(priv->zone, fle, priv);
			return;
		}

		if (export_add(exp.item, fle) > 0)
			export_send(priv, fe, exp.item, flags);
		else
			return_export_dgram(priv, fe, exp.item, NG_QUEUE);
	}

	if (priv->export9 != NULL) {
		exp.item9 = get_export9_dgram(priv, fe, &exp.item9_opt);
		if (exp.item9 == NULL) {
			priv->nfinfo_export9_failed++;
			if (version == IPVERSION)
				uma_zfree_arg(priv->zone, fle, priv);
#ifdef INET6
			else if (version == IP6VERSION)
				uma_zfree_arg(priv->zone6, fle, priv);
#endif
			else
				panic("ng_netflow: Unknown IP proto: %d",
				    version);
			return;
		}

		if (export9_add(exp.item9, exp.item9_opt, fle) > 0)
			export9_send(priv, fe, exp.item9, exp.item9_opt, flags);
		else
			return_export9_dgram(priv, fe, exp.item9,
			    exp.item9_opt, NG_QUEUE);
	}

	if (version == IPVERSION)
		uma_zfree_arg(priv->zone, fle, priv);
#ifdef INET6
	else if (version == IP6VERSION)
		uma_zfree_arg(priv->zone6, fle, priv);
#endif
}

/* Get a snapshot of node statistics */
void