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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) 1991, 1993
25: * The Regents of the University of California. All rights reserved.
26: *
27: * This code is derived from software contributed to Berkeley by the
28: * 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: * @(#)hdlc.h 8.1 (Berkeley) 6/10/93
60: */
61:
62: #ifndef ORDER4
63: #define FALSE 0
64: #define TRUE 1
65: typedef u_char octet;
66: typedef char bool;
67:
68: /*
69: * HDLC Packet format definitions
70: * This will eventually have to be rewritten without reference
71: * to bit fields, to be compliant with ANSI C and alignment safe.
72: */
73:
74: #if BYTE_ORDER == BIG_ENDIAN
75: #define ORDER4(a, b, c, d) a , b , c , d
76: #define ORDER5(a, b, c, d, e) a , b , c , d , e
77: #endif
78:
79: #if BYTE_ORDER == LITTLE_ENDIAN
80: #define ORDER4(a, b, c, d) d , c , b , a
81: #define ORDER5(a, b, c, d, e) e , d , c , b , a
82: #endif
83: #endif
84:
85: #define MAX_INFO_LEN 4096+3+4
86: #define ADDRESS_A 3 /* B'00000011' */
87: #define ADDRESS_B 1 /* B'00000001' */
88:
89: struct Hdlc_iframe {
90: octet address;
91: octet ORDER4(nr:3, pf:1, ns:3, hdlc_0:1);
92: octet i_field[MAX_INFO_LEN];
93: };
94:
95: struct Hdlc_sframe {
96: octet address;
97: octet ORDER4(nr:3, pf:1, s2:2, hdlc_01:2);
98: };
99:
100: struct Hdlc_uframe {
101: octet address;
102: octet ORDER4(m3:3, pf:1, m2:2, hdlc_11:2);
103: };
104:
105: struct Frmr_frame {
106: octet address;
107: octet control;
108: octet frmr_control;
109: octet ORDER4(frmr_nr:3, frmr_f1_0:1, frmr_ns:3, frmr_f2_0:1);
110: octet ORDER5(frmr_0000:4, frmr_z:1, frmr_y:1, frmr_x:1, frmr_w:1);
111: };
112:
113: #define HDHEADERLN 2
114: #define MINFRLN 2 /* Minimum frame length. */
115:
116: struct Hdlc_frame {
117: octet address;
118: octet control;
119: octet info[3]; /* min for FRMR */
120: };
121:
122: #define SABM_CONTROL 057 /* B'00101111' */
123: #define UA_CONTROL 0143 /* B'01100011' */
124: #define DISC_CONTROL 0103 /* B'01000011' */
125: #define DM_CONTROL 017 /* B'00001111' */
126: #define FRMR_CONTROL 0207 /* B'10000111' */
127: #define RR_CONTROL 01 /* B'00000001' */
128: #define RNR_CONTROL 05 /* B'00000101' */
129: #define REJ_CONTROL 011 /* B'00001001' */
130:
131: #define POLLOFF 0
132: #define POLLON 1
133:
134: /* Define Link State constants. */
135:
136: #define INIT 0
137: #define DM_SENT 1
138: #define SABM_SENT 2
139: #define ABM 3
140: #define WAIT_SABM 4
141: #define WAIT_UA 5
142: #define DISC_SENT 6
143: #define DISCONNECTED 7
144: #define MAXSTATE 8
145:
146: /* The following constants are used in a switch statement to process
147: frames read from the communications line. */
148:
149: #define SABM 0 * MAXSTATE
150: #define DM 1 * MAXSTATE
151: #define DISC 2 * MAXSTATE
152: #define UA 3 * MAXSTATE
153: #define FRMR 4 * MAXSTATE
154: #define RR 5 * MAXSTATE
155: #define RNR 6 * MAXSTATE
156: #define REJ 7 * MAXSTATE
157: #define IFRAME 8 * MAXSTATE
158: #define ILLEGAL 9 * MAXSTATE
159:
160: #define T1 (3 * PR_SLOWHZ) /* IFRAME TIMEOUT - 3 seconds */
161: #define T3 (T1 / 2) /* RR generate timeout - 1.5 seconds */
162: #define N2 10
163: #define MODULUS 8
164: #define MAX_WINDOW_SIZE 7
165:
166: #define Z 0
167: #define Y 1
168: #define X 2
169: #define W 3
170: #define A 4
171:
172: #define TX 0
173: #define RX 1
174:
175: bool range_check ();
176: bool valid_nr ();
177: struct mbuf *hd_remove ();
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