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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) University of British Columbia, 1984
24: * Copyright (c) 1990, 1993
25: * The Regents of the University of California. All rights reserved.
26: *
27: * This code is derived from software contributed to Berkeley by
28: * the Laboratory for Computation Vision and the Computer Science Department
29: * of the University of British Columbia.
30: *
31: * Redistribution and use in source and binary forms, with or without
32: * modification, are permitted provided that the following conditions
33: * are met:
34: * 1. Redistributions of source code must retain the above copyright
35: * notice, this list of conditions and the following disclaimer.
36: * 2. Redistributions in binary form must reproduce the above copyright
37: * notice, this list of conditions and the following disclaimer in the
38: * documentation and/or other materials provided with the distribution.
39: * 3. All advertising materials mentioning features or use of this software
40: * must display the following acknowledgement:
41: * This product includes software developed by the University of
42: * California, Berkeley and its contributors.
43: * 4. Neither the name of the University nor the names of its contributors
44: * may be used to endorse or promote products derived from this software
45: * without specific prior written permission.
46: *
47: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
48: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
49: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
50: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
51: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
52: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
53: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
54: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
55: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
56: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
57: * SUCH DAMAGE.
58: *
59: * @(#)hd_timer.c 8.1 (Berkeley) 6/10/93
60: */
61:
62: #include <sys/param.h>
63: #include <sys/systm.h>
64: #include <sys/mbuf.h>
65: #include <sys/domain.h>
66: #include <sys/socket.h>
67: #include <sys/protosw.h>
68: #include <sys/errno.h>
69: #include <sys/time.h>
70: #include <sys/kernel.h>
71:
72: #include <net/if.h>
73:
74: #include <netccitt/hdlc.h>
75: #include <netccitt/hd_var.h>
76: #include <netccitt/x25.h>
77:
78: /*
79: * these can be patched with adb if the
80: * default values are inappropriate
81: */
82:
83: int hd_t1 = T1;
84: int hd_t3 = T3;
85: int hd_n2 = N2;
86:
87: /*
88: * HDLC TIMER
89: *
90: * This routine is called every 500ms by the kernel. Decrement timer by this
91: * amount - if expired then process the event.
92: */
93:
94: hd_timer ()
95: {
96: register struct hdcb *hdp;
97: register int s = splimp ();
98:
99: for (hdp = hdcbhead; hdp; hdp = hdp->hd_next) {
100: if (hdp->hd_rrtimer && (--hdp->hd_rrtimer == 0)) {
101: if (hdp->hd_lasttxnr != hdp->hd_vr)
102: hd_writeinternal (hdp, RR, POLLOFF);
103: }
104:
105: if (!(hdp->hd_timer && --hdp->hd_timer == 0))
106: continue;
107:
108: switch (hdp->hd_state) {
109: case INIT:
110: case DISC_SENT:
111: hd_writeinternal (hdp, DISC, POLLON);
112: break;
113:
114: case ABM:
115: if (hdp->hd_lastrxnr != hdp->hd_vs) { /* XXX */
116: hdp->hd_timeouts++;
117: hd_resend_iframe (hdp);
118: }
119: break;
120:
121: case WAIT_SABM:
122: hd_writeinternal (hdp, FRMR, POLLOFF);
123: if (++hdp->hd_retxcnt == hd_n2) {
124: hdp->hd_retxcnt = 0;
125: hd_writeinternal (hdp, SABM, POLLOFF);
126: hdp->hd_state = WAIT_UA;
127: }
128: break;
129:
130: case DM_SENT:
131: if (++hdp->hd_retxcnt == hd_n2) {
132: /* Notify the packet level. */
133: (void) pk_ctlinput (PRC_LINKDOWN, hdp->hd_pkp);
134: hdp->hd_retxcnt = 0;
135: hdp->hd_state = SABM_SENT;
136: hd_writeinternal (hdp, SABM, POLLOFF);
137: } else
138: hd_writeinternal (hdp, DM, POLLOFF);
139: break;
140:
141: case WAIT_UA:
142: if (++hdp->hd_retxcnt == hd_n2) {
143: hdp->hd_retxcnt = 0;
144: hd_writeinternal (hdp, DM, POLLOFF);
145: hdp->hd_state = DM_SENT;
146: } else
147: hd_writeinternal (hdp, SABM, POLLOFF);
148: break;
149:
150: case SABM_SENT:
151: /* Do this indefinitely. */
152: hd_writeinternal (hdp, SABM, POLLON);
153: break;
154:
155: case DISCONNECTED:
156: /*
157: * Poll the interface driver flags waiting
158: * for the IFF_UP bit to come on.
159: */
160: if (hdp->hd_ifp->if_flags & IFF_UP)
161: hdp->hd_state = INIT;
162:
163: }
164: SET_TIMER (hdp);
165: }
166:
167: splx (s);
168: }
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