181 lines
5.4 KiB
C
181 lines
5.4 KiB
C
/*
|
|
* Copyright (C) Dirk Husemann, Computer Science Department IV,
|
|
* University of Erlangen-Nuremberg, Germany, 1990, 1991, 1992
|
|
* Copyright (c) 1992, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Dirk Husemann and the Computer Science Department (IV) of
|
|
* the University of Erlangen-Nuremberg, Germany.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)llc_timer.c 8.1 (Berkeley) 6/10/93
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/domain.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/protosw.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/time.h>
|
|
#include <sys/kernel.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_dl.h>
|
|
#include <net/if_llc.h>
|
|
|
|
#include <netccitt/dll.h>
|
|
#include <netccitt/llc_var.h>
|
|
|
|
|
|
/*
|
|
* Various timer values. They can be adjusted
|
|
* by patching the binary with adb if necessary.
|
|
*/
|
|
/* ISO 8802-2 timers */
|
|
int llc_n2 = LLC_N2_VALUE;
|
|
int llc_ACK_timer = LLC_ACK_TIMER;
|
|
int llc_P_timer = LLC_P_TIMER;
|
|
int llc_BUSY_timer = LLC_BUSY_TIMER;
|
|
int llc_REJ_timer = LLC_REJ_TIMER;
|
|
/* Implementation specific timers */
|
|
int llc_AGE_timer = LLC_AGE_TIMER;
|
|
int llc_DACTION_timer = LLC_DACTION_TIMER;
|
|
|
|
/*
|
|
* The timer routine. We are called every 500ms by the kernel.
|
|
* Handle the various virtual timers.
|
|
*/
|
|
|
|
void
|
|
llc_timer()
|
|
{
|
|
register struct llc_linkcb *linkp;
|
|
register struct llc_linkcb *nlinkp;
|
|
register int timer;
|
|
register int action;
|
|
register int s = splimp();
|
|
|
|
/*
|
|
* All links are accessible over the doubly linked list llccb_q
|
|
*/
|
|
if (!LQEMPTY) {
|
|
/*
|
|
* A for-loop is not that great an idea as the linkp
|
|
* might get deleted if the age timer has expired ...
|
|
*/
|
|
linkp = LQFIRST;
|
|
while (LQVALID(linkp)) {
|
|
nlinkp = LQNEXT(linkp);
|
|
/*
|
|
* Check implementation specific timers first
|
|
*/
|
|
/* The delayed action/acknowledge idle timer */
|
|
switch (LLC_TIMERXPIRED(linkp, DACTION)) {
|
|
case LLC_TIMER_RUNNING:
|
|
LLC_AGETIMER(linkp, DACTION);
|
|
break;
|
|
case LLC_TIMER_EXPIRED: {
|
|
register int cmdrsp;
|
|
register int pollfinal;
|
|
|
|
switch (LLC_GETFLAG(linkp, DACTION)) {
|
|
case LLC_DACKCMD:
|
|
cmdrsp = LLC_CMD, pollfinal = 0;
|
|
break;
|
|
case LLC_DACKCMDPOLL:
|
|
cmdrsp = LLC_CMD, pollfinal = 1;
|
|
break;
|
|
case LLC_DACKRSP:
|
|
cmdrsp = LLC_RSP, pollfinal = 0;
|
|
break;
|
|
case LLC_DACKRSPFINAL:
|
|
cmdrsp = LLC_RSP, pollfinal = 1;
|
|
break;
|
|
}
|
|
llc_send(linkp, LLCFT_RR, cmdrsp, pollfinal);
|
|
LLC_STOPTIMER(linkp, DACTION);
|
|
break;
|
|
}
|
|
}
|
|
/* The link idle timer */
|
|
switch (LLC_TIMERXPIRED(linkp, AGE)) {
|
|
case LLC_TIMER_RUNNING:
|
|
LLC_AGETIMER(linkp, AGE);
|
|
break;
|
|
case LLC_TIMER_EXPIRED:
|
|
/*
|
|
* Only crunch the link when really no
|
|
* timers are running any more.
|
|
*/
|
|
if (llc_anytimersup(linkp) == 0) {
|
|
llc_dellink(linkp);
|
|
LLC_STOPTIMER(linkp, AGE);
|
|
goto gone;
|
|
} else {
|
|
LLC_STARTTIMER(linkp, AGE);
|
|
}
|
|
break;
|
|
}
|
|
/*
|
|
* Now, check all the ISO 8802-2 timers
|
|
*/
|
|
FOR_ALL_LLC_TIMERS(timer) {
|
|
action = 0;
|
|
if ((linkp->llcl_timerflags & (1<<timer)) &&
|
|
(linkp->llcl_timers[timer] == 0)) {
|
|
switch (timer) {
|
|
case LLC_ACK_SHIFT:
|
|
action = LLC_ACK_TIMER_EXPIRED;
|
|
break;
|
|
case LLC_P_SHIFT:
|
|
action = LLC_P_TIMER_EXPIRED;
|
|
break;
|
|
case LLC_BUSY_SHIFT:
|
|
action = LLC_BUSY_TIMER_EXPIRED;
|
|
break;
|
|
case LLC_REJ_SHIFT:
|
|
action = LLC_REJ_TIMER_EXPIRED;
|
|
break;
|
|
}
|
|
linkp->llcl_timerflags &= ~(1<<timer);
|
|
(void)llc_statehandler(linkp, (struct llc *)0, action, 0, 1);
|
|
} else if (linkp->llcl_timers[timer] > 0)
|
|
linkp->llcl_timers[timer]--;
|
|
}
|
|
|
|
gone: linkp = nlinkp;
|
|
}
|
|
}
|
|
splx (s);
|
|
}
|