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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /*
26: * Copyright (C) Dirk Husemann, Computer Science Department IV,
27: * University of Erlangen-Nuremberg, Germany, 1990, 1991, 1992
28: * Copyright (c) 1992, 1993
29: * The Regents of the University of California. All rights reserved.
30: *
31: * This code is derived from software contributed to Berkeley by
32: * Dirk Husemann and the Computer Science Department (IV) of
33: * the University of Erlangen-Nuremberg, Germany.
34: *
35: * Redistribution and use in source and binary forms, with or without
36: * modification, are permitted provided that the following conditions
37: * are met:
38: * 1. Redistributions of source code must retain the above copyright
39: * notice, this list of conditions and the following disclaimer.
40: * 2. Redistributions in binary form must reproduce the above copyright
41: * notice, this list of conditions and the following disclaimer in the
42: * documentation and/or other materials provided with the distribution.
43: * 3. All advertising materials mentioning features or use of this software
44: * must display the following acknowledgement:
45: * This product includes software developed by the University of
46: * California, Berkeley and its contributors.
47: * 4. Neither the name of the University nor the names of its contributors
48: * may be used to endorse or promote products derived from this software
49: * without specific prior written permission.
50: *
51: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
52: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
53: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
54: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
55: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
56: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
57: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
58: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
59: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
60: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
61: * SUCH DAMAGE.
62: *
63: * @(#)llc_timer.c 8.1 (Berkeley) 6/10/93
64: */
65:
66: #include <sys/param.h>
67: #include <sys/systm.h>
68: #include <sys/mbuf.h>
69: #include <sys/domain.h>
70: #include <sys/socket.h>
71: #include <sys/protosw.h>
72: #include <sys/errno.h>
73: #include <sys/time.h>
74: #include <sys/kernel.h>
75:
76: #include <net/if.h>
77: #include <net/if_dl.h>
78: #include <net/if_llc.h>
79:
80: #include <netccitt/dll.h>
81: #include <netccitt/llc_var.h>
82:
83:
84: /*
85: * Various timer values. They can be adjusted
86: * by patching the binary with adb if necessary.
87: */
88: /* ISO 8802-2 timers */
89: int llc_n2 = LLC_N2_VALUE;
90: int llc_ACK_timer = LLC_ACK_TIMER;
91: int llc_P_timer = LLC_P_TIMER;
92: int llc_BUSY_timer = LLC_BUSY_TIMER;
93: int llc_REJ_timer = LLC_REJ_TIMER;
94: /* Implementation specific timers */
95: int llc_AGE_timer = LLC_AGE_TIMER;
96: int llc_DACTION_timer = LLC_DACTION_TIMER;
97:
98: /*
99: * The timer routine. We are called every 500ms by the kernel.
100: * Handle the various virtual timers.
101: */
102:
103: void
104: llc_timer()
105: {
106: register struct llc_linkcb *linkp;
107: register struct llc_linkcb *nlinkp;
108: register int timer;
109: register int action;
110: register int s = splimp();
111:
112: /*
113: * All links are accessible over the doubly linked list llccb_q
114: */
115: if (!LQEMPTY) {
116: /*
117: * A for-loop is not that great an idea as the linkp
118: * might get deleted if the age timer has expired ...
119: */
120: linkp = LQFIRST;
121: while (LQVALID(linkp)) {
122: nlinkp = LQNEXT(linkp);
123: /*
124: * Check implementation specific timers first
125: */
126: /* The delayed action/acknowledge idle timer */
127: switch (LLC_TIMERXPIRED(linkp, DACTION)) {
128: case LLC_TIMER_RUNNING:
129: LLC_AGETIMER(linkp, DACTION);
130: break;
131: case LLC_TIMER_EXPIRED: {
132: register int cmdrsp;
133: register int pollfinal;
134:
135: switch (LLC_GETFLAG(linkp, DACTION)) {
136: case LLC_DACKCMD:
137: cmdrsp = LLC_CMD, pollfinal = 0;
138: break;
139: case LLC_DACKCMDPOLL:
140: cmdrsp = LLC_CMD, pollfinal = 1;
141: break;
142: case LLC_DACKRSP:
143: cmdrsp = LLC_RSP, pollfinal = 0;
144: break;
145: case LLC_DACKRSPFINAL:
146: cmdrsp = LLC_RSP, pollfinal = 1;
147: break;
148: }
149: llc_send(linkp, LLCFT_RR, cmdrsp, pollfinal);
150: LLC_STOPTIMER(linkp, DACTION);
151: break;
152: }
153: }
154: /* The link idle timer */
155: switch (LLC_TIMERXPIRED(linkp, AGE)) {
156: case LLC_TIMER_RUNNING:
157: LLC_AGETIMER(linkp, AGE);
158: break;
159: case LLC_TIMER_EXPIRED:
160: /*
161: * Only crunch the link when really no
162: * timers are running any more.
163: */
164: if (llc_anytimersup(linkp) == 0) {
165: llc_dellink(linkp);
166: LLC_STOPTIMER(linkp, AGE);
167: goto gone;
168: } else {
169: LLC_STARTTIMER(linkp, AGE);
170: }
171: break;
172: }
173: /*
174: * Now, check all the ISO 8802-2 timers
175: */
176: FOR_ALL_LLC_TIMERS(timer) {
177: action = 0;
178: if ((linkp->llcl_timerflags & (1<<timer)) &&
179: (linkp->llcl_timers[timer] == 0)) {
180: switch (timer) {
181: case LLC_ACK_SHIFT:
182: action = LLC_ACK_TIMER_EXPIRED;
183: break;
184: case LLC_P_SHIFT:
185: action = LLC_P_TIMER_EXPIRED;
186: break;
187: case LLC_BUSY_SHIFT:
188: action = LLC_BUSY_TIMER_EXPIRED;
189: break;
190: case LLC_REJ_SHIFT:
191: action = LLC_REJ_TIMER_EXPIRED;
192: break;
193: }
194: linkp->llcl_timerflags &= ~(1<<timer);
195: (void)llc_statehandler(linkp, (struct llc *)0, action, 0, 1);
196: } else if (linkp->llcl_timers[timer] > 0)
197: linkp->llcl_timers[timer]--;
198: }
199:
200: gone: linkp = nlinkp;
201: }
202: }
203: splx (s);
204: }
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