146 lines
4.2 KiB
C
146 lines
4.2 KiB
C
/*
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* Copyright (c) University of British Columbia, 1984
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Laboratory for Computation Vision and the Computer Science Department
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* of the University of British Columbia.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)hd_timer.c 8.1 (Berkeley) 6/10/93
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* $Id: hd_timer.c,v 1.3 1995/02/15 06:29:46 jkh Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/domain.h>
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#include <sys/socket.h>
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#include <sys/protosw.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <net/if.h>
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#include <netccitt/hdlc.h>
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#include <netccitt/hd_var.h>
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#include <netccitt/x25.h>
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/*
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* these can be patched with adb if the
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* default values are inappropriate
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*/
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/*
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* HDLC TIMER
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*
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* This routine is called every 500ms by the kernel. Decrement timer by this
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* amount - if expired then process the event.
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*/
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void
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hd_timer ()
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{
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register struct hdcb *hdp;
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register int s = splimp ();
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for (hdp = hdcbhead; hdp; hdp = hdp->hd_next) {
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if (hdp->hd_rrtimer && (--hdp->hd_rrtimer == 0)) {
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if (hdp->hd_lasttxnr != hdp->hd_vr)
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hd_writeinternal (hdp, RR, POLLOFF);
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}
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if (!(hdp->hd_timer && --hdp->hd_timer == 0))
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continue;
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switch (hdp->hd_state) {
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case INIT:
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case DISC_SENT:
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hd_writeinternal (hdp, DISC, POLLON);
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break;
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case ABM:
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if (hdp->hd_lastrxnr != hdp->hd_vs) { /* XXX */
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hdp->hd_timeouts++;
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hd_resend_iframe (hdp);
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}
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break;
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case WAIT_SABM:
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hd_writeinternal (hdp, FRMR, POLLOFF);
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if (++hdp->hd_retxcnt == hd_n2) {
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hdp->hd_retxcnt = 0;
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hd_writeinternal (hdp, SABM, POLLOFF);
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hdp->hd_state = WAIT_UA;
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}
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break;
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case DM_SENT:
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if (++hdp->hd_retxcnt == hd_n2) {
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/* Notify the packet level. */
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(void) pk_ctlinput (PRC_LINKDOWN, hdp->hd_pkp);
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hdp->hd_retxcnt = 0;
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hdp->hd_state = SABM_SENT;
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hd_writeinternal (hdp, SABM, POLLOFF);
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} else
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hd_writeinternal (hdp, DM, POLLOFF);
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break;
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case WAIT_UA:
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if (++hdp->hd_retxcnt == hd_n2) {
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hdp->hd_retxcnt = 0;
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hd_writeinternal (hdp, DM, POLLOFF);
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hdp->hd_state = DM_SENT;
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} else
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hd_writeinternal (hdp, SABM, POLLOFF);
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break;
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case SABM_SENT:
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/* Do this indefinitely. */
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hd_writeinternal (hdp, SABM, POLLON);
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break;
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case DISCONNECTED:
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/*
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* Poll the interface driver flags waiting
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* for the IFF_UP bit to come on.
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*/
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if (hdp->hd_ifp->if_flags & IFF_UP)
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hdp->hd_state = INIT;
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}
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SET_TIMER (hdp);
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}
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splx (s);
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}
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