FreeBSD-5.3/sys/netatm/uni/sscop_timer.c
/*
* ===================================
* HARP | Host ATM Research Platform
* ===================================
*
*
* This Host ATM Research Platform ("HARP") file (the "Software") is
* made available by Network Computing Services, Inc. ("NetworkCS")
* "AS IS". NetworkCS does not provide maintenance, improvements or
* support of any kind.
*
* NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
* INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
* SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
* In no event shall NetworkCS be responsible for any damages, including
* but not limited to consequential damages, arising from or relating to
* any use of the Software or related support.
*
* Copyright 1994-1998 Network Computing Services, Inc.
*
* Copies of this Software may be made, however, the above copyright
* notice must be reproduced on all copies.
*/
/*
* ATM Forum UNI Support
* ---------------------
*
* SSCOP - Timer processing
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/netatm/uni/sscop_timer.c,v 1.10 2003/06/11 07:22:30 obrien Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <netatm/port.h>
#include <netatm/queue.h>
#include <netatm/atm.h>
#include <netatm/atm_sys.h>
#include <netatm/atm_sap.h>
#include <netatm/atm_cm.h>
#include <netatm/atm_if.h>
#include <netatm/atm_stack.h>
#include <netatm/atm_pcb.h>
#include <netatm/atm_var.h>
#include <netatm/uni/sscop.h>
#include <netatm/uni/sscop_misc.h>
#include <netatm/uni/sscop_var.h>
/*
* Local functions
*/
static void sscop_poll_expire(struct sscop *);
static void sscop_noresponse_expire(struct sscop *);
static void sscop_cc_expire(struct sscop *);
static void sscop_idle_expire(struct sscop *);
/*
* Local variables
*/
static void (*sscop_expired[SSCOP_T_NUM])(struct sscop *) = {
sscop_poll_expire,
sscop_noresponse_expire,
sscop_cc_expire,
sscop_idle_expire
};
/*
* Process an SSCOP timer tick
*
* This function is called SSCOP_HZ times a second in order to update
* all of the sscop connection timers. The sscop expiration function
* will be called to process all timer expirations.
*
* Called at splnet.
*
* Arguments:
* tip pointer to sscop timer control block
*
* Returns:
* none
*
*/
void
sscop_timeout(tip)
struct atm_time *tip;
{
struct sscop *sop, **sprev;
int i;
/*
* Schedule next timeout
*/
atm_timeout(&sscop_timer, ATM_HZ/SSCOP_HZ, sscop_timeout);
/*
* Run through all connections, updating each active timer.
* If an expired timer is found, notify that entry.
*/
sprev = &sscop_head;
while ((sop = *sprev) != NULL) {
/*
* Check out each timer
*/
for (i =0; i < SSCOP_T_NUM; i++) {
/*
* Decrement timer if it's active
*/
if (sop->so_timer[i] && (--sop->so_timer[i] == 0)) {
#ifdef DIAGNOSTIC
{
static char *tn[] = {
"POLL",
"NORESPONSE",
"CC",
"IDLE"
};
ATM_DEBUG3("sscop_timer: %s expired, sop=%p, state=%d\n",
tn[i], sop, sop->so_state);
}
#endif
/*
* Expired timer - process it
*/
(*sscop_expired[i])(sop);
/*
* Make sure connection still exists
*/
if (*sprev != sop)
break;
}
}
/*
* Update previous pointer if current control
* block wasn't deleted
*/
if (*sprev == sop)
sprev = &sop->so_next;
}
}
/*
* Process an SSCOP Timer_POLL expiration
*
* Arguments:
* sop pointer to sscop connection control block
*
* Returns:
* none
*
*/
static void
sscop_poll_expire(sop)
struct sscop *sop;
{
/*
* Validate current state
*/
if ((sop->so_state != SOS_READY) &&
((sop->so_state != SOS_INRESYN) ||
(sop->so_vers != SSCOP_VERS_QSAAL))) {
log(LOG_ERR, "sscop: invalid %s state: sop=%p, state=%d\n",
"Timer_POLL", sop, sop->so_state);
return;
}
/*
* Send next poll along its way
*/
SEQ_INCR(sop->so_pollsend, 1);
(void) sscop_send_poll(sop);
/*
* Reset data counter for this poll cycle
*/
sop->so_polldata = 0;
/*
* Reset polling timer
*/
sscop_set_poll(sop);
return;
}
/*
* Process an SSCOP Timer_IDLE expiration
*
* Arguments:
* sop pointer to sscop connection control block
*
* Returns:
* none
*
*/
static void
sscop_idle_expire(sop)
struct sscop *sop;
{
/*
* Timer_IDLE only valid in READY state
*/
if (sop->so_state != SOS_READY) {
log(LOG_ERR, "sscop: invalid %s state: sop=%p, state=%d\n",
"Timer_IDLE", sop, sop->so_state);
return;
}
/*
* Send next poll along its way
*/
SEQ_INCR(sop->so_pollsend, 1);
(void) sscop_send_poll(sop);
/*
* Reset data counter for this poll cycle
*/
sop->so_polldata = 0;
/*
* Start NO-RESPONSE timer
*/
sop->so_timer[SSCOP_T_NORESP] = sop->so_parm.sp_timeresp;
/*
* Reset polling timer
*/
sscop_set_poll(sop);
return;
}
/*
* Process an SSCOP Timer_NORESPONSE expiration
*
* Arguments:
* sop pointer to sscop connection control block
*
* Returns:
* none
*
*/
static void
sscop_noresponse_expire(sop)
struct sscop *sop;
{
int err;
/*
* Validate current state
*/
if ((sop->so_state != SOS_READY) &&
((sop->so_state != SOS_INRESYN) ||
(sop->so_vers != SSCOP_VERS_QSAAL))) {
log(LOG_ERR, "sscop: invalid %s state: sop=%p, state=%d\n",
"Timer_NORESPONSE", sop, sop->so_state);
return;
}
/*
* Peer seems to be dead, so terminate session
*/
STACK_CALL(SSCOP_RELEASE_IND, sop->so_upper,
sop->so_toku, sop->so_connvc,
SSCOP_UU_NULL, SSCOP_SOURCE_SSCOP, err);
if (err) {
/*
* Error, force retry
*/
sop->so_timer[SSCOP_T_NORESP] = 1;
return;
}
/*
* Stop data transfer timers
*/
sop->so_timer[SSCOP_T_POLL] = 0;
sop->so_timer[SSCOP_T_IDLE] = 0;
sop->so_flags &= ~SOF_KEEPALIVE;
/*
* Notify peer of termination
*/
(void) sscop_send_end(sop, SSCOP_SOURCE_SSCOP);
/*
* Report peer's failure
*/
sscop_maa_error(sop, 'P');
if (sop->so_vers == SSCOP_VERS_QSAAL)
/*
* Clear connection data
*/
qsaal1_clear_connection(sop);
else
/*
* Clear out appropriate queues
*/
q2110_prep_retrieve(sop);
/*
* Return to IDLE state
*/
sop->so_state = SOS_IDLE;
return;
}
/*
* Process an SSCOP Timer_CC expiration
*
* Arguments:
* sop pointer to sscop connection control block
*
* Returns:
* none
*
*/
static void
sscop_cc_expire(sop)
struct sscop *sop;
{
int err;
/*
* Process timeout based on protocol state
*/
switch (sop->so_state) {
case SOS_OUTCONN:
/*
* No response to our BGN yet
*/
if (sop->so_connctl < sop->so_parm.sp_maxcc) {
/*
* Send another BGN PDU
*/
sop->so_connctl++;
(void) sscop_send_bgn(sop, SSCOP_SOURCE_USER);
/*
* Restart retransmit timer
*/
sop->so_timer[SSCOP_T_CC] = sop->so_parm.sp_timecc;
} else {
/*
* Retransmit limit exceeded, terminate session
*/
STACK_CALL(SSCOP_RELEASE_IND, sop->so_upper,
sop->so_toku, sop->so_connvc,
SSCOP_UU_NULL, SSCOP_SOURCE_SSCOP, err);
if (err) {
/*
* Error, force retry
*/
sop->so_timer[SSCOP_T_CC] = 1;
break;
}
/*
* Notify peer of termination
*/
(void) sscop_send_end(sop, SSCOP_SOURCE_SSCOP);
/*
* Report establishment failure
*/
sscop_maa_error(sop, 'O');
/*
* Clear reestablishment flag
*/
sop->so_flags &= ~SOF_REESTAB;
/*
* Return to IDLE state
*/
sop->so_state = SOS_IDLE;
}
break;
case SOS_OUTDISC:
/*
* No response to our END yet
*/
if (sop->so_connctl < sop->so_parm.sp_maxcc) {
/*
* Send another END PDU
*/
sop->so_connctl++;
(void) sscop_send_end(sop, SSCOP_SOURCE_LAST);
/*
* Restart retransmit timer
*/
sop->so_timer[SSCOP_T_CC] = sop->so_parm.sp_timecc;
} else {
/*
* Retransmit limit exceeded, force session termination
*/
STACK_CALL(SSCOP_RELEASE_CNF, sop->so_upper,
sop->so_toku, sop->so_connvc, 0, 0, err);
if (err) {
/*
* Error, force retry
*/
sop->so_timer[SSCOP_T_CC] = 1;
break;
}
/*
* Report establishment failure
*/
sscop_maa_error(sop, 'O');
/*
* Return to IDLE state
*/
sop->so_state = SOS_IDLE;
}
break;
case SOS_OUTRESYN:
rexmitrs:
/*
* No response to our RS yet
*/
if (sop->so_connctl < sop->so_parm.sp_maxcc) {
/*
* Send another RS PDU
*/
sop->so_connctl++;
(void) sscop_send_rs(sop);
/*
* Restart retransmit timer
*/
sop->so_timer[SSCOP_T_CC] = sop->so_parm.sp_timecc;
} else {
/*
* Retransmit limit exceeded, terminate session
*/
STACK_CALL(SSCOP_RELEASE_IND, sop->so_upper,
sop->so_toku, sop->so_connvc,
SSCOP_UU_NULL, SSCOP_SOURCE_SSCOP, err);
if (err) {
/*
* Error, force retry
*/
sop->so_timer[SSCOP_T_CC] = 1;
break;
}
/*
* Notify peer of termination
*/
(void) sscop_send_end(sop, SSCOP_SOURCE_SSCOP);
/*
* Report establishment failure
*/
sscop_maa_error(sop, 'O');
if (sop->so_vers == SSCOP_VERS_QSAAL)
/*
* Clear connection data
*/
qsaal1_clear_connection(sop);
/*
* Return to IDLE state
*/
sop->so_state = SOS_IDLE;
}
break;
case SOS_CONRESYN: /* Q.SAAL1 */
#if (SOS_OUTRECOV != SOS_CONRESYN)
case SOS_OUTRECOV: /* Q.2110 */
#endif
if (sop->so_vers == SSCOP_VERS_QSAAL) {
/*
* Handle timeout for SOS_CONRESYN
*/
goto rexmitrs;
}
/*
* Handle timeout for SOS_OUTRECOV
*/
/*
* No response to our ER yet
*/
if (sop->so_connctl < sop->so_parm.sp_maxcc) {
/*
* Send another ER PDU
*/
sop->so_connctl++;
(void) sscop_send_er(sop);
/*
* Restart retransmit timer
*/
sop->so_timer[SSCOP_T_CC] = sop->so_parm.sp_timecc;
} else {
/*
* Retransmit limit exceeded, terminate session
*/
STACK_CALL(SSCOP_RELEASE_IND, sop->so_upper,
sop->so_toku, sop->so_connvc,
SSCOP_UU_NULL, SSCOP_SOURCE_SSCOP, err);
if (err) {
/*
* Error, force retry
*/
sop->so_timer[SSCOP_T_CC] = 1;
break;
}
/*
* Notify peer of termination
*/
(void) sscop_send_end(sop, SSCOP_SOURCE_SSCOP);
/*
* Report establishment failure
*/
sscop_maa_error(sop, 'O');
/*
* Clear receiver buffer
*/
sscop_rcvr_drain(sop);
/*
* Return to IDLE state
*/
sop->so_state = SOS_IDLE;
}
break;
default:
log(LOG_ERR, "sscop: invalid %s state: sop=%p, state=%d\n",
"Timer_CC", sop, sop->so_state);
}
}