Commit f9200a52 authored by Julian Anastasov's avatar Julian Anastasov Committed by Pablo Neira Ayuso
Browse files

ipvs: avoid expiring many connections from timer 



Add new functions ip_vs_conn_del() and ip_vs_conn_del_put()
to release many IPVS connections in process context.
They are suitable for connections found in table
when we do not want to overload the timers.

Currently, the change is useful for the dropentry delayed
work but it will be used also in following patch
when flushing connections to failed destinations.

Signed-off-by: default avatarJulian Anastasov <ja@ssi.bg>
Reviewed-by: default avatarSimon Horman <horms@verge.net.au>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent 857ca897

net/netfilter/ipvs/ip_vs_conn.c

+38 −15
Original line number Diff line number Diff line
@@ -807,6 +807,31 @@ static void ip_vs_conn_rcu_free(struct rcu_head *head) 
	kmem_cache_free(ip_vs_conn_cachep, cp);

}



/* Try to delete connection while not holding reference */

static void ip_vs_conn_del(struct ip_vs_conn *cp)

{

	if (del_timer(&cp->timer)) {

		/* Drop cp->control chain too */

		if (cp->control)

			cp->timeout = 0;

		ip_vs_conn_expire(&cp->timer);

	}

}



/* Try to delete connection while holding reference */

static void ip_vs_conn_del_put(struct ip_vs_conn *cp)

{

	if (del_timer(&cp->timer)) {

		/* Drop cp->control chain too */

		if (cp->control)

			cp->timeout = 0;

		__ip_vs_conn_put(cp);

		ip_vs_conn_expire(&cp->timer);

	} else {

		__ip_vs_conn_put(cp);

	}

}



static void ip_vs_conn_expire(struct timer_list *t)

{

	struct ip_vs_conn *cp = from_timer(cp, t, timer);
@@ -827,14 +852,17 @@ static void ip_vs_conn_expire(struct timer_list *t) 


		/* does anybody control me? */

		if (ct) {

			bool has_ref = !cp->timeout && __ip_vs_conn_get(ct);



			ip_vs_control_del(cp);

			/* Drop CTL or non-assured TPL if not used anymore */

			if (!cp->timeout && !atomic_read(&ct->n_control) &&

			if (has_ref && !atomic_read(&ct->n_control) &&

			    (!(ct->flags & IP_VS_CONN_F_TEMPLATE) ||

			     !(ct->state & IP_VS_CTPL_S_ASSURED))) {

				IP_VS_DBG(4, "drop controlling connection\n");

				ct->timeout = 0;

				ip_vs_conn_expire_now(ct);

				ip_vs_conn_del_put(ct);

			} else if (has_ref) {

				__ip_vs_conn_put(ct);

			}

		}
@@ -1317,8 +1345,7 @@ try_drop: 


drop:

			IP_VS_DBG(4, "drop connection\n");

			cp->timeout = 0;

			ip_vs_conn_expire_now(cp);

			ip_vs_conn_del(cp);

		}

		cond_resched_rcu();

	}
@@ -1341,19 +1368,15 @@ flush_again: 
		hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[idx], c_list) {

			if (cp->ipvs != ipvs)

				continue;

			/* As timers are expired in LIFO order, restart

			 * the timer of controlling connection first, so

			 * that it is expired after us.

			 */

			if (atomic_read(&cp->n_control))

				continue;

			cp_c = cp->control;

			/* cp->control is valid only with reference to cp */

			if (cp_c && __ip_vs_conn_get(cp)) {

			IP_VS_DBG(4, "del connection\n");

			ip_vs_conn_del(cp);

			if (cp_c && !atomic_read(&cp_c->n_control)) {

				IP_VS_DBG(4, "del controlling connection\n");

				ip_vs_conn_expire_now(cp_c);

				__ip_vs_conn_put(cp);

				ip_vs_conn_del(cp_c);

			}

			IP_VS_DBG(4, "del connection\n");

			ip_vs_conn_expire_now(cp);

		}

		cond_resched_rcu();

	}

net/netfilter/ipvs/ip_vs_ctl.c

+4 −2
Original line number Diff line number Diff line
@@ -224,7 +224,8 @@ static void defense_work_handler(struct work_struct *work) 
	update_defense_level(ipvs);

	if (atomic_read(&ipvs->dropentry))

		ip_vs_random_dropentry(ipvs);

	schedule_delayed_work(&ipvs->defense_work, DEFENSE_TIMER_PERIOD);

	queue_delayed_work(system_long_wq, &ipvs->defense_work,

			   DEFENSE_TIMER_PERIOD);

}

#endif
@@ -4082,7 +4083,8 @@ static int __net_init ip_vs_control_net_init_sysctl(struct netns_ipvs *ipvs) 
	ipvs->sysctl_tbl = tbl;

	/* Schedule defense work */

	INIT_DELAYED_WORK(&ipvs->defense_work, defense_work_handler);

	schedule_delayed_work(&ipvs->defense_work, DEFENSE_TIMER_PERIOD);

	queue_delayed_work(system_long_wq, &ipvs->defense_work,

			   DEFENSE_TIMER_PERIOD);



	return 0;

}

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