5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * CDDL HEADER START
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * The contents of this file are subject to the terms of the
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * Common Development and Distribution License (the "License").
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * You may not use this file except in compliance with the License.
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * See the License for the specific language governing permissions
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * and limitations under the License.
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * When distributing Covered Code, include this CDDL HEADER in each
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * If applicable, add the following below this CDDL HEADER, with the
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * fields enclosed by brackets "[]" replaced with your own identifying
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * information: Portions Copyright [yyyy] [name of copyright owner]
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * CDDL HEADER END
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon/* Control whether SCTP can enter defensive mode when under memory pressure. */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonstatic void sctp_reclaim_timer(void *);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon/* Diagnostic routine used to return a string associated with the sctp state. */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon static char priv_buf[INET6_ADDRSTRLEN * 2 + 80];
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon return ("NULL_SCTP");
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon (void) mi_sprintf(buf1, "SCTPUnkState(%d)", sctp->sctp_state);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon ntohs(connp->conn_lport), ntohs(connp->conn_fport), cp);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon for (sctp_walker = list_head(&sctps->sctps_g_list);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon sctp_walker = (sctp_t *)list_next(&sctps->sctps_g_list,
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * Given a sctp_stack_t and a port (in host byte order), find a listener
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * configuration for that port and return the ratio.
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonsctp_find_listener_conf(sctp_stack_t *sctps, in_port_t port)
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon mutex_enter(&sctps->sctps_listener_conf_lock);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon for (sl = list_head(&sctps->sctps_listener_conf); sl != NULL;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon sl = list_next(&sctps->sctps_listener_conf, sl)) {
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * To remove all listener limit configuration in a sctp_stack_t.
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonsctp_listener_conf_cleanup(sctp_stack_t *sctps)
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon mutex_enter(&sctps->sctps_listener_conf_lock);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon while ((sl = list_head(&sctps->sctps_listener_conf)) != NULL) {
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon mutex_destroy(&sctps->sctps_listener_conf_lock);
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * Timeout function to reset the SCTP stack variable sctps_reclaim to false.
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon tot_assoc += sctps->sctps_sc[i]->sctp_sc_assoc_cnt;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * This happens only when a stack is going away. sctps_reclaim_tid
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * should not be reset to 0 when returning in this case.
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon if ((freemem >= lotsfree + needfree) || tot_assoc < maxusers) {
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon /* Stay in defensive mode and restart the timer */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon sctps->sctps_reclaim_tid = timeout(sctp_reclaim_timer,
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon sctps, MSEC_TO_TICK(sctps->sctps_reclaim_period));
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * Kmem reclaim call back function. When the system is under memory
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * pressure, we set the SCTP stack variable sctps_reclaim to true. This
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * variable is reset to false after sctps_reclaim_period msecs. During this
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * period, SCTP will be more aggressive in aborting connections not making
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * progress, meaning retransmitting for shorter time (sctp_pa_early_abort/
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * sctp_pp_early_abort number of strikes).
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon/* ARGSUSED */
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * The reclaim function may be called even when the system is not
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * really under memory pressure.
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * During boot time, the first netstack_t is created and
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * initialized before SCTP has registered with the netstack
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * framework. If this reclaim function is called before SCTP
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * has finished its initialization, netstack_next() will
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * return the first netstack_t (since its netstack_flags is
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * not NSF_UNINIT). And its netstack_sctp will be NULL. We
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * need to catch it.
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * All subsequent netstack_t creation will not have this
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * problem since the initialization is not finished until SCTP
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * has finished its own sctp_stack_t initialization. Hence
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * netstack_next() will not return one with NULL netstack_sctp.
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * Even if the system is under memory pressure, the reason may
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * not be because of SCTP activity. Check the number of
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * associations in each stack. If the number exceeds the
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * threshold (maxusers), turn on defensive mode.
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon tot_assoc += sctps->sctps_sc[i]->sctp_sc_assoc_cnt;
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon sctps->sctps_reclaim_tid = timeout(sctp_reclaim_timer,
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon sctps, MSEC_TO_TICK(sctps->sctps_reclaim_period));
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon * When a CPU is added, we need to allocate the per CPU stats struct.
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poonsctp_stack_cpu_add(sctp_stack_t *sctps, processorid_t cpu_seqid)
5dd46ab5742d7db1cbb08dec7b64fa14930c02f7Kacheong Poon for (i = sctps->sctps_sc_cnt; i <= cpu_seqid; i++) {