577 lines
10 KiB
C
577 lines
10 KiB
C
/*
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*
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* ===================================
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* HARP | Host ATM Research Platform
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* ===================================
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*
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*
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* This Host ATM Research Platform ("HARP") file (the "Software") is
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* made available by Network Computing Services, Inc. ("NetworkCS")
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* "AS IS". NetworkCS does not provide maintenance, improvements or
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* support of any kind.
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*
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* NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
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* INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
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* SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
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* In no event shall NetworkCS be responsible for any damages, including
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* but not limited to consequential damages, arising from or relating to
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* any use of the Software or related support.
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*
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* Copyright 1994-1998 Network Computing Services, Inc.
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*
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* Copies of this Software may be made, however, the above copyright
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* notice must be reproduced on all copies.
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*
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* @(#) $Id: sscop_timer.c,v 1.3 1998/10/31 20:07:00 phk Exp $
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*
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*/
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/*
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* ATM Forum UNI Support
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* ---------------------
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*
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* SSCOP - Timer processing
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*
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*/
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#include <netatm/kern_include.h>
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#include <netatm/uni/uni.h>
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#include <netatm/uni/sscop.h>
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#include <netatm/uni/sscop_misc.h>
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#include <netatm/uni/sscop_pdu.h>
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#include <netatm/uni/sscop_var.h>
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#ifndef lint
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__RCSID("@(#) $Id: sscop_timer.c,v 1.3 1998/10/31 20:07:00 phk Exp $");
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#endif
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/*
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* Local functions
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*/
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static void sscop_poll_expire __P((struct sscop *));
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static void sscop_noresponse_expire __P((struct sscop *));
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static void sscop_cc_expire __P((struct sscop *));
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static void sscop_idle_expire __P((struct sscop *));
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/*
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* Local variables
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*/
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static void (*sscop_expired[SSCOP_T_NUM]) __P((struct sscop *)) = {
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sscop_poll_expire,
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sscop_noresponse_expire,
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sscop_cc_expire,
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sscop_idle_expire
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};
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/*
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* Process an SSCOP timer tick
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*
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* This function is called SSCOP_HZ times a second in order to update
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* all of the sscop connection timers. The sscop expiration function
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* will be called to process all timer expirations.
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*
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* Called at splnet.
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*
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* Arguments:
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* tip pointer to sscop timer control block
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*
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* Returns:
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* none
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*
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*/
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void
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sscop_timeout(tip)
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struct atm_time *tip;
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{
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struct sscop *sop, **sprev;
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int i;
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/*
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* Schedule next timeout
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*/
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atm_timeout(&sscop_timer, ATM_HZ/SSCOP_HZ, sscop_timeout);
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/*
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* Run through all connections, updating each active timer.
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* If an expired timer is found, notify that entry.
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*/
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sprev = &sscop_head;
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while ((sop = *sprev) != NULL) {
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/*
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* Check out each timer
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*/
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for (i =0; i < SSCOP_T_NUM; i++) {
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/*
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* Decrement timer if it's active
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*/
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if (sop->so_timer[i] && (--sop->so_timer[i] == 0)) {
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#ifdef DIAGNOSTIC
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{
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static char *tn[] = {
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"POLL",
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"NORESPONSE",
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"CC",
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"IDLE"
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};
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ATM_DEBUG3("sscop_timer: %s expired, sop=%p, state=%d\n",
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tn[i], sop, sop->so_state);
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}
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#endif
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/*
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* Expired timer - process it
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*/
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(*sscop_expired[i])(sop);
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/*
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* Make sure connection still exists
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*/
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if (*sprev != sop)
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break;
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}
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}
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/*
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* Update previous pointer if current control
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* block wasn't deleted
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*/
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if (*sprev == sop)
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sprev = &sop->so_next;
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}
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}
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/*
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* Process an SSCOP Timer_POLL expiration
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*
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* Arguments:
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* sop pointer to sscop connection control block
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*
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* Returns:
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* none
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*
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*/
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static void
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sscop_poll_expire(sop)
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struct sscop *sop;
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{
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/*
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* Validate current state
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*/
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if ((sop->so_state != SOS_READY) &&
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((sop->so_state != SOS_INRESYN) ||
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(sop->so_vers != SSCOP_VERS_QSAAL))) {
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log(LOG_ERR, "sscop: invalid %s state: sop=%p, state=%d\n",
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"Timer_POLL", sop, sop->so_state);
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return;
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}
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/*
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* Send next poll along its way
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*/
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SEQ_INCR(sop->so_pollsend, 1);
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(void) sscop_send_poll(sop);
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/*
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* Reset data counter for this poll cycle
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*/
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sop->so_polldata = 0;
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/*
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* Reset polling timer
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*/
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sscop_set_poll(sop);
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return;
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}
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/*
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* Process an SSCOP Timer_IDLE expiration
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*
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* Arguments:
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* sop pointer to sscop connection control block
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*
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* Returns:
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* none
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*
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*/
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static void
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sscop_idle_expire(sop)
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struct sscop *sop;
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{
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/*
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* Timer_IDLE only valid in READY state
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*/
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if (sop->so_state != SOS_READY) {
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log(LOG_ERR, "sscop: invalid %s state: sop=%p, state=%d\n",
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"Timer_IDLE", sop, sop->so_state);
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return;
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}
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/*
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* Send next poll along its way
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*/
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SEQ_INCR(sop->so_pollsend, 1);
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(void) sscop_send_poll(sop);
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/*
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* Reset data counter for this poll cycle
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*/
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sop->so_polldata = 0;
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/*
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* Start NO-RESPONSE timer
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*/
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sop->so_timer[SSCOP_T_NORESP] = sop->so_parm.sp_timeresp;
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/*
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* Reset polling timer
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*/
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sscop_set_poll(sop);
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return;
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}
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/*
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* Process an SSCOP Timer_NORESPONSE expiration
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*
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* Arguments:
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* sop pointer to sscop connection control block
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*
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* Returns:
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* none
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*
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*/
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static void
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sscop_noresponse_expire(sop)
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struct sscop *sop;
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{
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int err;
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/*
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* Validate current state
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*/
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if ((sop->so_state != SOS_READY) &&
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((sop->so_state != SOS_INRESYN) ||
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(sop->so_vers != SSCOP_VERS_QSAAL))) {
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log(LOG_ERR, "sscop: invalid %s state: sop=%p, state=%d\n",
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"Timer_NORESPONSE", sop, sop->so_state);
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return;
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}
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/*
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* Peer seems to be dead, so terminate session
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*/
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STACK_CALL(SSCOP_RELEASE_IND, sop->so_upper,
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sop->so_toku, sop->so_connvc,
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SSCOP_UU_NULL, SSCOP_SOURCE_SSCOP, err);
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if (err) {
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/*
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* Error, force retry
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*/
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sop->so_timer[SSCOP_T_NORESP] = 1;
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return;
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}
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/*
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* Stop data transfer timers
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*/
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sop->so_timer[SSCOP_T_POLL] = 0;
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sop->so_timer[SSCOP_T_IDLE] = 0;
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sop->so_flags &= ~SOF_KEEPALIVE;
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/*
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* Notify peer of termination
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*/
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(void) sscop_send_end(sop, SSCOP_SOURCE_SSCOP);
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/*
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* Report peer's failure
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*/
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sscop_maa_error(sop, 'P');
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if (sop->so_vers == SSCOP_VERS_QSAAL)
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/*
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* Clear connection data
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*/
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qsaal1_clear_connection(sop);
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else
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/*
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* Clear out appropriate queues
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*/
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q2110_prep_retrieve(sop);
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/*
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* Return to IDLE state
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*/
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sop->so_state = SOS_IDLE;
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return;
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}
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/*
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* Process an SSCOP Timer_CC expiration
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*
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* Arguments:
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* sop pointer to sscop connection control block
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*
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* Returns:
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* none
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*
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*/
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static void
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sscop_cc_expire(sop)
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struct sscop *sop;
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{
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int err;
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/*
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* Process timeout based on protocol state
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*/
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switch (sop->so_state) {
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case SOS_OUTCONN:
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/*
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* No response to our BGN yet
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*/
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if (sop->so_connctl < sop->so_parm.sp_maxcc) {
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/*
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* Send another BGN PDU
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*/
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sop->so_connctl++;
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(void) sscop_send_bgn(sop, SSCOP_SOURCE_USER);
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/*
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* Restart retransmit timer
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*/
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sop->so_timer[SSCOP_T_CC] = sop->so_parm.sp_timecc;
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} else {
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/*
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* Retransmit limit exceeded, terminate session
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*/
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STACK_CALL(SSCOP_RELEASE_IND, sop->so_upper,
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sop->so_toku, sop->so_connvc,
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SSCOP_UU_NULL, SSCOP_SOURCE_SSCOP, err);
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if (err) {
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/*
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* Error, force retry
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*/
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sop->so_timer[SSCOP_T_CC] = 1;
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break;
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}
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/*
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* Notify peer of termination
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*/
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(void) sscop_send_end(sop, SSCOP_SOURCE_SSCOP);
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/*
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* Report establishment failure
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*/
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sscop_maa_error(sop, 'O');
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/*
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* Clear reestablishment flag
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*/
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sop->so_flags &= ~SOF_REESTAB;
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/*
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* Return to IDLE state
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*/
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sop->so_state = SOS_IDLE;
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}
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break;
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case SOS_OUTDISC:
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/*
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* No response to our END yet
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*/
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if (sop->so_connctl < sop->so_parm.sp_maxcc) {
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/*
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* Send another END PDU
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*/
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sop->so_connctl++;
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(void) sscop_send_end(sop, SSCOP_SOURCE_LAST);
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/*
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* Restart retransmit timer
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*/
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sop->so_timer[SSCOP_T_CC] = sop->so_parm.sp_timecc;
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} else {
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/*
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* Retransmit limit exceeded, force session termination
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*/
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STACK_CALL(SSCOP_RELEASE_CNF, sop->so_upper,
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sop->so_toku, sop->so_connvc, 0, 0, err);
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if (err) {
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/*
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* Error, force retry
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*/
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sop->so_timer[SSCOP_T_CC] = 1;
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break;
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}
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/*
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* Report establishment failure
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*/
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sscop_maa_error(sop, 'O');
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/*
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* Return to IDLE state
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*/
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sop->so_state = SOS_IDLE;
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}
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break;
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case SOS_OUTRESYN:
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rexmitrs:
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/*
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* No response to our RS yet
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*/
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if (sop->so_connctl < sop->so_parm.sp_maxcc) {
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/*
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* Send another RS PDU
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*/
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sop->so_connctl++;
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(void) sscop_send_rs(sop);
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/*
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* Restart retransmit timer
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*/
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sop->so_timer[SSCOP_T_CC] = sop->so_parm.sp_timecc;
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} else {
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/*
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* Retransmit limit exceeded, terminate session
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*/
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STACK_CALL(SSCOP_RELEASE_IND, sop->so_upper,
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sop->so_toku, sop->so_connvc,
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SSCOP_UU_NULL, SSCOP_SOURCE_SSCOP, err);
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if (err) {
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/*
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* Error, force retry
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*/
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sop->so_timer[SSCOP_T_CC] = 1;
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break;
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}
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/*
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* Notify peer of termination
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*/
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(void) sscop_send_end(sop, SSCOP_SOURCE_SSCOP);
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/*
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* Report establishment failure
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*/
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sscop_maa_error(sop, 'O');
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if (sop->so_vers == SSCOP_VERS_QSAAL)
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/*
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* Clear connection data
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*/
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qsaal1_clear_connection(sop);
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/*
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* Return to IDLE state
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*/
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sop->so_state = SOS_IDLE;
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}
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break;
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case SOS_CONRESYN: /* Q.SAAL1 */
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#if (SOS_OUTRECOV != SOS_CONRESYN)
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case SOS_OUTRECOV: /* Q.2110 */
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#endif
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if (sop->so_vers == SSCOP_VERS_QSAAL) {
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/*
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* Handle timeout for SOS_CONRESYN
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*/
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goto rexmitrs;
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}
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/*
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* Handle timeout for SOS_OUTRECOV
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*/
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/*
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* No response to our ER yet
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*/
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if (sop->so_connctl < sop->so_parm.sp_maxcc) {
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/*
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* Send another ER PDU
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*/
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sop->so_connctl++;
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(void) sscop_send_er(sop);
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/*
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* Restart retransmit timer
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*/
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sop->so_timer[SSCOP_T_CC] = sop->so_parm.sp_timecc;
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} else {
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/*
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* Retransmit limit exceeded, terminate session
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*/
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STACK_CALL(SSCOP_RELEASE_IND, sop->so_upper,
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sop->so_toku, sop->so_connvc,
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SSCOP_UU_NULL, SSCOP_SOURCE_SSCOP, err);
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if (err) {
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/*
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* Error, force retry
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*/
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sop->so_timer[SSCOP_T_CC] = 1;
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break;
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}
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/*
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* Notify peer of termination
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*/
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(void) sscop_send_end(sop, SSCOP_SOURCE_SSCOP);
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/*
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* Report establishment failure
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*/
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sscop_maa_error(sop, 'O');
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/*
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* Clear receiver buffer
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*/
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sscop_rcvr_drain(sop);
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/*
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* Return to IDLE state
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*/
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sop->so_state = SOS_IDLE;
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}
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break;
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default:
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log(LOG_ERR, "sscop: invalid %s state: sop=%p, state=%d\n",
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"Timer_CC", sop, sop->so_state);
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}
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}
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