mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-20 11:11:24 +00:00
149 lines
4.2 KiB
C
149 lines
4.2 KiB
C
/*
|
|
* Copyright (c) University of British Columbia, 1984
|
|
* Copyright (c) 1990, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* the Laboratory for Computation Vision and the Computer Science Department
|
|
* of the University of British Columbia.
|
|
*
|
|
* 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.
|
|
*
|
|
* @(#)hd_timer.c 8.1 (Berkeley) 6/10/93
|
|
* $Id$
|
|
*/
|
|
|
|
#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 <netccitt/hdlc.h>
|
|
#include <netccitt/hd_var.h>
|
|
#include <netccitt/x25.h>
|
|
|
|
/*
|
|
* these can be patched with adb if the
|
|
* default values are inappropriate
|
|
*/
|
|
|
|
int hd_t1 = T1;
|
|
int hd_t3 = T3;
|
|
int hd_n2 = N2;
|
|
|
|
/*
|
|
* HDLC TIMER
|
|
*
|
|
* This routine is called every 500ms by the kernel. Decrement timer by this
|
|
* amount - if expired then process the event.
|
|
*/
|
|
|
|
hd_timer ()
|
|
{
|
|
register struct hdcb *hdp;
|
|
register int s = splimp ();
|
|
|
|
for (hdp = hdcbhead; hdp; hdp = hdp->hd_next) {
|
|
if (hdp->hd_rrtimer && (--hdp->hd_rrtimer == 0)) {
|
|
if (hdp->hd_lasttxnr != hdp->hd_vr)
|
|
hd_writeinternal (hdp, RR, POLLOFF);
|
|
}
|
|
|
|
if (!(hdp->hd_timer && --hdp->hd_timer == 0))
|
|
continue;
|
|
|
|
switch (hdp->hd_state) {
|
|
case INIT:
|
|
case DISC_SENT:
|
|
hd_writeinternal (hdp, DISC, POLLON);
|
|
break;
|
|
|
|
case ABM:
|
|
if (hdp->hd_lastrxnr != hdp->hd_vs) { /* XXX */
|
|
hdp->hd_timeouts++;
|
|
hd_resend_iframe (hdp);
|
|
}
|
|
break;
|
|
|
|
case WAIT_SABM:
|
|
hd_writeinternal (hdp, FRMR, POLLOFF);
|
|
if (++hdp->hd_retxcnt == hd_n2) {
|
|
hdp->hd_retxcnt = 0;
|
|
hd_writeinternal (hdp, SABM, POLLOFF);
|
|
hdp->hd_state = WAIT_UA;
|
|
}
|
|
break;
|
|
|
|
case DM_SENT:
|
|
if (++hdp->hd_retxcnt == hd_n2) {
|
|
/* Notify the packet level. */
|
|
(void) pk_ctlinput (PRC_LINKDOWN, hdp->hd_pkp);
|
|
hdp->hd_retxcnt = 0;
|
|
hdp->hd_state = SABM_SENT;
|
|
hd_writeinternal (hdp, SABM, POLLOFF);
|
|
} else
|
|
hd_writeinternal (hdp, DM, POLLOFF);
|
|
break;
|
|
|
|
case WAIT_UA:
|
|
if (++hdp->hd_retxcnt == hd_n2) {
|
|
hdp->hd_retxcnt = 0;
|
|
hd_writeinternal (hdp, DM, POLLOFF);
|
|
hdp->hd_state = DM_SENT;
|
|
} else
|
|
hd_writeinternal (hdp, SABM, POLLOFF);
|
|
break;
|
|
|
|
case SABM_SENT:
|
|
/* Do this indefinitely. */
|
|
hd_writeinternal (hdp, SABM, POLLON);
|
|
break;
|
|
|
|
case DISCONNECTED:
|
|
/*
|
|
* Poll the interface driver flags waiting
|
|
* for the IFF_UP bit to come on.
|
|
*/
|
|
if (hdp->hd_ifp->if_flags & IFF_UP)
|
|
hdp->hd_state = INIT;
|
|
|
|
}
|
|
SET_TIMER (hdp);
|
|
}
|
|
|
|
splx (s);
|
|
}
|