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