Author: tuexen
Date: Tue Feb 16 19:36:25 2016
New Revision: 295668
URL: https://svnweb.freebsd.org/changeset/base/295668
Log:
Improve the teardown of the SCTP stack.
Obtained from: bz@
MFC after: 1 week
Modified:
head/sys/netinet/sctp_asconf.c
head/sys/netinet/sctp_bsd_addr.c
head/sys/netinet/sctp_pcb.c
head/sys/netinet/sctp_pcb.h
head/sys/netinet/sctputil.c
Modified: head/sys/netinet/sctp_asconf.c
==============================================================================
--- head/sys/netinet/sctp_asconf.c Tue Feb 16 19:11:17 2016
(r295667)
+++ head/sys/netinet/sctp_asconf.c Tue Feb 16 19:36:25 2016
(r295668)
@@ -3248,6 +3248,7 @@ sctp_addr_mgmt_ep_sa(struct sctp_inpcb *
} else {
struct sctp_asconf_iterator *asc;
struct sctp_laddr *wi;
+ int ret;
SCTP_MALLOC(asc, struct sctp_asconf_iterator *,
sizeof(struct sctp_asconf_iterator),
@@ -3269,7 +3270,7 @@ sctp_addr_mgmt_ep_sa(struct sctp_inpcb *
wi->action = type;
atomic_add_int(&ifa->refcount, 1);
LIST_INSERT_HEAD(&asc->list_of_work, wi, sctp_nxt_addr);
- (void)sctp_initiate_iterator(sctp_asconf_iterator_ep,
+ ret = sctp_initiate_iterator(sctp_asconf_iterator_ep,
sctp_asconf_iterator_stcb,
sctp_asconf_iterator_ep_end,
SCTP_PCB_ANY_FLAGS,
@@ -3277,6 +3278,12 @@ sctp_addr_mgmt_ep_sa(struct sctp_inpcb *
SCTP_ASOC_ANY_STATE,
(void *)asc, 0,
sctp_asconf_iterator_end, inp, 0);
+ if (ret) {
+ SCTP_PRINTF("Failed to initiate iterator for
addr_mgmt_ep_sa\n");
+ SCTP_LTRACE_ERR_RET(inp, NULL, NULL,
SCTP_FROM_SCTP_ASCONF, EFAULT);
+ sctp_asconf_iterator_end(asc, 0);
+ return (EFAULT);
+ }
}
return (0);
} else {
Modified: head/sys/netinet/sctp_bsd_addr.c
==============================================================================
--- head/sys/netinet/sctp_bsd_addr.c Tue Feb 16 19:11:17 2016
(r295667)
+++ head/sys/netinet/sctp_bsd_addr.c Tue Feb 16 19:36:25 2016
(r295668)
@@ -293,6 +293,10 @@ sctp_addr_change(struct ifaddr *ifa, int
{
uint32_t ifa_flags = 0;
+ if (SCTP_BASE_VAR(sctp_pcb_initialized) == 0) {
+ return;
+ }
+
/*
* BSD only has one VRF, if this changes we will need to hook in the
* right things here to get the id to pass to the address managment
Modified: head/sys/netinet/sctp_pcb.c
==============================================================================
--- head/sys/netinet/sctp_pcb.c Tue Feb 16 19:11:17 2016 (r295667)
+++ head/sys/netinet/sctp_pcb.c Tue Feb 16 19:36:25 2016 (r295668)
@@ -2781,8 +2781,45 @@ sctp_move_pcb_and_assoc(struct sctp_inpc
SCTP_INP_WUNLOCK(old_inp);
}
+/*
+ * insert an laddr entry with the given ifa for the desired list
+ */
+static int
+sctp_insert_laddr(struct sctpladdr *list, struct sctp_ifa *ifa, uint32_t act)
+{
+ struct sctp_laddr *laddr;
+ laddr = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_laddr), struct
sctp_laddr);
+ if (laddr == NULL) {
+ /* out of memory? */
+ SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PCB,
EINVAL);
+ return (EINVAL);
+ }
+ SCTP_INCR_LADDR_COUNT();
+ bzero(laddr, sizeof(*laddr));
+ (void)SCTP_GETTIME_TIMEVAL(&laddr->start_time);
+ laddr->ifa = ifa;
+ laddr->action = act;
+ atomic_add_int(&ifa->refcount, 1);
+ /* insert it */
+ LIST_INSERT_HEAD(list, laddr, sctp_nxt_addr);
+ return (0);
+}
+
+/*
+ * Remove an laddr entry from the local address list (on an assoc)
+ */
+static void
+sctp_remove_laddr(struct sctp_laddr *laddr)
+{
+
+ /* remove from the list */
+ LIST_REMOVE(laddr, sctp_nxt_addr);
+ sctp_free_ifa(laddr->ifa);
+ SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_laddr), laddr);
+ SCTP_DECR_LADDR_COUNT();
+}
/* sctp_ifap is used to bypass normal local address validation checks */
int
@@ -5509,46 +5546,6 @@ sctp_add_local_addr_restricted(struct sc
}
/*
- * insert an laddr entry with the given ifa for the desired list
- */
-int
-sctp_insert_laddr(struct sctpladdr *list, struct sctp_ifa *ifa, uint32_t act)
-{
- struct sctp_laddr *laddr;
-
- laddr = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_laddr), struct
sctp_laddr);
- if (laddr == NULL) {
- /* out of memory? */
- SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PCB,
EINVAL);
- return (EINVAL);
- }
- SCTP_INCR_LADDR_COUNT();
- bzero(laddr, sizeof(*laddr));
- (void)SCTP_GETTIME_TIMEVAL(&laddr->start_time);
- laddr->ifa = ifa;
- laddr->action = act;
- atomic_add_int(&ifa->refcount, 1);
- /* insert it */
- LIST_INSERT_HEAD(list, laddr, sctp_nxt_addr);
-
- return (0);
-}
-
-/*
- * Remove an laddr entry from the local address list (on an assoc)
- */
-void
-sctp_remove_laddr(struct sctp_laddr *laddr)
-{
-
- /* remove from the list */
- LIST_REMOVE(laddr, sctp_nxt_addr);
- sctp_free_ifa(laddr->ifa);
- SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_laddr), laddr);
- SCTP_DECR_LADDR_COUNT();
-}
-
-/*
* Remove a local address from the TCB local address restricted list
*/
void
@@ -5918,12 +5915,33 @@ sctp_pcb_finish(void)
int i;
struct sctp_iterator *it, *nit;
+ if (SCTP_BASE_VAR(sctp_pcb_initialized) == 0) {
+ SCTP_PRINTF("%s: race condition on teardown.\n", __func__);
+ return;
+ }
+ SCTP_BASE_VAR(sctp_pcb_initialized) = 0;
+
/*
* In FreeBSD the iterator thread never exits but we do clean up.
* The only way FreeBSD reaches here is if we have VRF's but we
* still add the ifdef to make it compile on old versions.
*/
+retry:
SCTP_IPI_ITERATOR_WQ_LOCK();
+ /*
+ * sctp_iterator_worker() might be working on an it entry without
+ * holding the lock. We won't find it on the list either and
+ * continue and free/destroy it. While holding the lock, spin, to
+ * avoid the race condition as sctp_iterator_worker() will have to
+ * wait to re-aquire the lock.
+ */
+ if (sctp_it_ctl.iterator_running != 0 || sctp_it_ctl.cur_it != NULL) {
+ SCTP_IPI_ITERATOR_WQ_UNLOCK();
+ SCTP_PRINTF("%s: Iterator running while we held the lock.
Retry. "
+ "cur_it=%p\n", __func__, sctp_it_ctl.cur_it);
+ DELAY(10);
+ goto retry;
+ }
TAILQ_FOREACH_SAFE(it, &sctp_it_ctl.iteratorhead, sctp_nxt_itr, nit) {
if (it->vn != curvnet) {
continue;
@@ -5941,7 +5959,7 @@ sctp_pcb_finish(void)
sctp_it_ctl.iterator_flags |= SCTP_ITERATOR_STOP_CUR_IT;
}
SCTP_ITERATOR_UNLOCK();
- SCTP_OS_TIMER_STOP(&SCTP_BASE_INFO(addr_wq_timer.timer));
+ SCTP_OS_TIMER_STOP_DRAIN(&SCTP_BASE_INFO(addr_wq_timer.timer));
SCTP_WQ_ADDR_LOCK();
LIST_FOREACH_SAFE(wi, &SCTP_BASE_INFO(addr_wq), sctp_nxt_addr, nwi) {
LIST_REMOVE(wi, sctp_nxt_addr);
@@ -6008,6 +6026,14 @@ sctp_pcb_finish(void)
SCTP_WQ_ADDR_DESTROY();
+ /* Get rid of other stuff too. */
+ if (SCTP_BASE_INFO(sctp_asochash) != NULL)
+ SCTP_HASH_FREE(SCTP_BASE_INFO(sctp_asochash),
SCTP_BASE_INFO(hashasocmark));
+ if (SCTP_BASE_INFO(sctp_ephash) != NULL)
+ SCTP_HASH_FREE(SCTP_BASE_INFO(sctp_ephash),
SCTP_BASE_INFO(hashmark));
+ if (SCTP_BASE_INFO(sctp_tcpephash) != NULL)
+ SCTP_HASH_FREE(SCTP_BASE_INFO(sctp_tcpephash),
SCTP_BASE_INFO(hashtcpmark));
+
SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_ep));
SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_asoc));
SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_laddr));
@@ -6017,13 +6043,7 @@ sctp_pcb_finish(void)
SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_strmoq));
SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_asconf));
SCTP_ZONE_DESTROY(SCTP_BASE_INFO(ipi_zone_asconf_ack));
- /* Get rid of other stuff to */
- if (SCTP_BASE_INFO(sctp_asochash) != NULL)
- SCTP_HASH_FREE(SCTP_BASE_INFO(sctp_asochash),
SCTP_BASE_INFO(hashasocmark));
- if (SCTP_BASE_INFO(sctp_ephash) != NULL)
- SCTP_HASH_FREE(SCTP_BASE_INFO(sctp_ephash),
SCTP_BASE_INFO(hashmark));
- if (SCTP_BASE_INFO(sctp_tcpephash) != NULL)
- SCTP_HASH_FREE(SCTP_BASE_INFO(sctp_tcpephash),
SCTP_BASE_INFO(hashtcpmark));
+
#if defined(__FreeBSD__) && defined(SMP) && defined(SCTP_USE_PERCPU_STAT)
SCTP_FREE(SCTP_BASE_STATS, SCTP_M_MCORE);
#endif
@@ -6987,6 +7007,11 @@ sctp_initiate_iterator(inp_func inpf,
if (af == NULL) {
return (-1);
}
+ if (SCTP_BASE_VAR(sctp_pcb_initialized) == 0) {
+ SCTP_PRINTF("%s: abort on initialize being %d\n", __func__,
+ SCTP_BASE_VAR(sctp_pcb_initialized));
+ return (-1);
+ }
SCTP_MALLOC(it, struct sctp_iterator *, sizeof(struct sctp_iterator),
SCTP_M_ITER);
if (it == NULL) {
@@ -7025,6 +7050,13 @@ sctp_initiate_iterator(inp_func inpf,
}
SCTP_IPI_ITERATOR_WQ_LOCK();
+ if (SCTP_BASE_VAR(sctp_pcb_initialized) == 0) {
+ SCTP_IPI_ITERATOR_WQ_UNLOCK();
+ SCTP_PRINTF("%s: rollback on initialize being %d it=%p\n",
__func__,
+ SCTP_BASE_VAR(sctp_pcb_initialized), it);
+ SCTP_FREE(it, SCTP_M_ITER);
+ return (-1);
+ }
TAILQ_INSERT_TAIL(&sctp_it_ctl.iteratorhead, it, sctp_nxt_itr);
if (sctp_it_ctl.iterator_running == 0) {
Modified: head/sys/netinet/sctp_pcb.h
==============================================================================
--- head/sys/netinet/sctp_pcb.h Tue Feb 16 19:11:17 2016 (r295667)
+++ head/sys/netinet/sctp_pcb.h Tue Feb 16 19:36:25 2016 (r295668)
@@ -598,10 +598,6 @@ void
void sctp_add_local_addr_ep(struct sctp_inpcb *, struct sctp_ifa *, uint32_t);
-int sctp_insert_laddr(struct sctpladdr *, struct sctp_ifa *, uint32_t);
-
-void sctp_remove_laddr(struct sctp_laddr *);
-
void sctp_del_local_addr_ep(struct sctp_inpcb *, struct sctp_ifa *);
int sctp_add_remote_addr(struct sctp_tcb *, struct sockaddr *, struct
sctp_nets **, int, int);
Modified: head/sys/netinet/sctputil.c
==============================================================================
--- head/sys/netinet/sctputil.c Tue Feb 16 19:11:17 2016 (r295667)
+++ head/sys/netinet/sctputil.c Tue Feb 16 19:36:25 2016 (r295668)
@@ -1470,7 +1470,9 @@ sctp_handle_addr_wq(void)
if (asc->cnt == 0) {
SCTP_FREE(asc, SCTP_M_ASC_IT);
} else {
- (void)sctp_initiate_iterator(sctp_asconf_iterator_ep,
+ int ret;
+
+ ret = sctp_initiate_iterator(sctp_asconf_iterator_ep,
sctp_asconf_iterator_stcb,
NULL, /* No ep end for boundall */
SCTP_PCB_FLAGS_BOUNDALL,
@@ -1478,6 +1480,20 @@ sctp_handle_addr_wq(void)
SCTP_ASOC_ANY_STATE,
(void *)asc, 0,
sctp_asconf_iterator_end, NULL, 0);
+ if (ret) {
+ SCTP_PRINTF("Failed to initiate iterator for
handle_addr_wq\n");
+ /* Freeing if we are stopping or put back on the
addr_wq. */
+ if (SCTP_BASE_VAR(sctp_pcb_initialized) == 0) {
+ sctp_asconf_iterator_end(asc, 0);
+ } else {
+ SCTP_WQ_ADDR_LOCK();
+ LIST_FOREACH(wi, &asc->list_of_work,
sctp_nxt_addr) {
+
LIST_INSERT_HEAD(&SCTP_BASE_INFO(addr_wq), wi, sctp_nxt_addr);
+ }
+ SCTP_WQ_ADDR_UNLOCK();
+ SCTP_FREE(asc, SCTP_M_ASC_IT);
+ }
+ }
}
}
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