1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
/* $OpenBSD: pk_timer.c,v 1.3 2003/06/02 23:28:13 millert Exp $ */
/* $NetBSD: pk_timer.c,v 1.6 1996/02/13 22:05:39 christos Exp $ */
/*
* 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. 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.
*
* @(#)pk_timer.c 8.1 (Berkeley) 6/10/93
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/socketvar.h>
#include <sys/errno.h>
#include <net/if.h>
#include <netccitt/x25.h>
#include <netccitt/pk.h>
#include <netccitt/pk_var.h>
#include <netccitt/pk_extern.h>
/*
* Various timer values. They can be adjusted
* by patching the binary with adb if necessary.
*/
int pk_t20 = 18 * PR_SLOWHZ; /* restart timer */
int pk_t21 = 20 * PR_SLOWHZ; /* call timer */
/* XXX pk_t22 is never used */
int pk_t22 = 18 * PR_SLOWHZ; /* reset timer */
int pk_t23 = 18 * PR_SLOWHZ; /* clear timer */
void
pk_timer()
{
register struct pkcb *pkp;
register struct pklcd *lcp, **pp;
register int lcns_jammed, cant_restart;
FOR_ALL_PKCBS(pkp) {
switch (pkp->pk_state) {
case DTE_SENT_RESTART:
lcp = pkp->pk_chan[0];
/*
* If restart failures are common, a link level
* reset should be initiated here.
*/
if (lcp->lcd_timer && --lcp->lcd_timer == 0) {
pk_message(0, pkp->pk_xcp,
"packet level restart failed");
pkp->pk_state = DTE_WAITING;
}
break;
case DTE_READY:
lcns_jammed = cant_restart = 0;
for (pp = &pkp->pk_chan[1]; pp <= &pkp->pk_chan[pkp->pk_maxlcn]; pp++) {
if ((lcp = *pp) == 0)
continue;
switch (lcp->lcd_state) {
case SENT_CALL:
if (--lcp->lcd_timer == 0) {
if (lcp->lcd_so)
lcp->lcd_so->so_error = ETIMEDOUT;
pk_clear(lcp, 49, 1);
}
break;
case SENT_CLEAR:
if (lcp->lcd_retry >= 3)
lcns_jammed++;
else if (--lcp->lcd_timer == 0)
pk_clear(lcp, 50, 1);
break;
case DATA_TRANSFER: /* lcn active */
cant_restart++;
break;
case LCN_ZOMBIE: /* zombie state */
pk_freelcd(lcp);
break;
}
}
if (lcns_jammed > pkp->pk_maxlcn / 2 && cant_restart == 0) {
pk_message(0, pkp->pk_xcp, "%d lcns jammed: attempting restart", lcns_jammed);
pk_restart(pkp, 0);
}
}
}
}
|
