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	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
	11	*
	12	* This Original Code and all software distributed under the License are
	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* Copyright (c) Computing Centre, University of British Columbia, 1984
	24	* Copyright (C) Computer Science Department IV,
	25	* University of Erlangen-Nuremberg, Germany, 1990, 1992
	26	* Copyright (c) 1990, 1992, 1993
	27	* The Regents of the University of California. All rights reserved.
	28	*
	29	* This code is derived from software contributed to Berkeley by the
	30	* Laboratory for Computation Vision and the Computer Science Department
	31	* of the the University of British Columbia and the Computer Science
	32	* Department (IV) of the University of Erlangen-Nuremberg, Germany.
	33	*
	34	* Redistribution and use in source and binary forms, with or without
	35	* modification, are permitted provided that the following conditions
	36	* are met:
	37	* 1. Redistributions of source code must retain the above copyright
	38	* notice, this list of conditions and the following disclaimer.
	39	* 2. Redistributions in binary form must reproduce the above copyright
	40	* notice, this list of conditions and the following disclaimer in the
	41	* documentation and/or other materials provided with the distribution.
	42	* 3. All advertising materials mentioning features or use of this software
	43	* must display the following acknowledgement:
	44	* This product includes software developed by the University of
	45	* California, Berkeley and its contributors.
	46	* 4. Neither the name of the University nor the names of its contributors
	47	* may be used to endorse or promote products derived from this software
	48	* without specific prior written permission.
	49	*
	50	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	51	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	52	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	53	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	54	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	55	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	56	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	57	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	58	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	59	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	60	* SUCH DAMAGE.
	61	*
	62	* @(#)pk_timer.c 8.1 (Berkeley) 6/10/93
	63	*/
	64
	65	#include <sys/param.h>
	66	#include <sys/systm.h>
	67	#include <sys/mbuf.h>
	68	#include <sys/socket.h>
	69	#include <sys/protosw.h>
	70	#include <sys/socketvar.h>
	71	#include <sys/errno.h>
	72
	73	#include <net/if.h>
	74
	75	#include <netccitt/x25.h>
	76	#include <netccitt/pk.h>
	77	#include <netccitt/pk_var.h>
	78
	79	/*
	80	* Various timer values. They can be adjusted
	81	* by patching the binary with adb if necessary.
	82	*/
	83	int pk_t20 = 18 * PR_SLOWHZ; /* restart timer */
	84	int pk_t21 = 20 * PR_SLOWHZ; /* call timer */
	85	/* XXX pk_t22 is never used */
	86	int pk_t22 = 18 * PR_SLOWHZ; /* reset timer */
	87	int pk_t23 = 18 * PR_SLOWHZ; /* clear timer */
	88
	89	pk_timer ()
	90	{
	91	register struct pkcb *pkp;
	92	register struct pklcd lcp, *pp;
	93	register int lcns_jammed, cant_restart;
	94
	95	FOR_ALL_PKCBS(pkp) {
	96	switch (pkp -> pk_state) {
	97	case DTE_SENT_RESTART:
	98	lcp = pkp -> pk_chan[0];
	99	/*
	100	* If restart failures are common, a link level
	101	* reset should be initiated here.
	102	*/
	103	if (lcp -> lcd_timer && --lcp -> lcd_timer == 0) {
	104	pk_message (0, pkp -> pk_xcp,
	105	"packet level restart failed");
	106	pkp -> pk_state = DTE_WAITING;
	107	}
	108	break;
	109
	110	case DTE_READY:
	111	lcns_jammed = cant_restart = 0;
	112	for (pp = &pkp -> pk_chan[1]; pp <= &pkp -> pk_chan[pkp -> pk_maxlcn]; pp++) {
	113	if ((lcp = *pp) == 0)
	114	continue;
	115	switch (lcp -> lcd_state) {
	116	case SENT_CALL:
	117	if (--lcp -> lcd_timer == 0) {
	118	if (lcp -> lcd_so)
	119	lcp -> lcd_so -> so_error = ETIMEDOUT;
	120	pk_clear (lcp, 49, 1);
	121	}
	122	break;
	123
	124	case SENT_CLEAR:
	125	if (lcp -> lcd_retry >= 3)
	126	lcns_jammed++;
	127	else
	128	if (--lcp -> lcd_timer == 0)
	129	pk_clear (lcp, 50, 1);
	130	break;
	131
	132	case DATA_TRANSFER: /* lcn active */
	133	cant_restart++;
	134	break;
	135
	136	case LCN_ZOMBIE: /* zombie state */
	137	pk_freelcd (lcp);
	138	break;
	139	}
	140	}
	141	if (lcns_jammed > pkp -> pk_maxlcn / 2 && cant_restart == 0) {
	142	pk_message (0, pkp -> pk_xcp, "%d lcns jammed: attempting restart", lcns_jammed);
	143	pk_restart (pkp, 0);
	144	}
	145	}
	146	}
	147	}