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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) University of British Columbia, 1984
27: * Copyright (c) 1991, 1993
28: * The Regents of the University of California. All rights reserved.
29: *
30: * This code is derived from software contributed to Berkeley by the
31: * Laboratory for Computation Vision and the Computer Science Department
32: * of the University of British Columbia.
33: *
34: * Redistribution and use in source and binary forms, with or without
35: * modification, are permitted provided that the following conditions
36: * are met:
37: * 1. Redistributions of source code must retain the above copyright
38: * notice, this list of conditions and the following disclaimer.
39: * 2. Redistributions in binary form must reproduce the above copyright
40: * notice, this list of conditions and the following disclaimer in the
41: * documentation and/or other materials provided with the distribution.
42: * 3. All advertising materials mentioning features or use of this software
43: * must display the following acknowledgement:
44: * This product includes software developed by the University of
45: * California, Berkeley and its contributors.
46: * 4. Neither the name of the University nor the names of its contributors
47: * may be used to endorse or promote products derived from this software
48: * without specific prior written permission.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60: * SUCH DAMAGE.
61: *
62: * @(#)hdlc.h 8.1 (Berkeley) 6/10/93
63: */
64:
65: #ifndef ORDER4
66: #define FALSE 0
67: #define TRUE 1
68: typedef u_char octet;
69: typedef char bool;
70:
71: /*
72: * HDLC Packet format definitions
73: * This will eventually have to be rewritten without reference
74: * to bit fields, to be compliant with ANSI C and alignment safe.
75: */
76:
77: #if BYTE_ORDER == BIG_ENDIAN
78: #define ORDER4(a, b, c, d) a , b , c , d
79: #define ORDER5(a, b, c, d, e) a , b , c , d , e
80: #endif
81:
82: #if BYTE_ORDER == LITTLE_ENDIAN
83: #define ORDER4(a, b, c, d) d , c , b , a
84: #define ORDER5(a, b, c, d, e) e , d , c , b , a
85: #endif
86: #endif
87:
88: #define MAX_INFO_LEN 4096+3+4
89: #define ADDRESS_A 3 /* B'00000011' */
90: #define ADDRESS_B 1 /* B'00000001' */
91:
92: struct Hdlc_iframe {
93: octet address;
94: octet ORDER4(nr:3, pf:1, ns:3, hdlc_0:1);
95: octet i_field[MAX_INFO_LEN];
96: };
97:
98: struct Hdlc_sframe {
99: octet address;
100: octet ORDER4(nr:3, pf:1, s2:2, hdlc_01:2);
101: };
102:
103: struct Hdlc_uframe {
104: octet address;
105: octet ORDER4(m3:3, pf:1, m2:2, hdlc_11:2);
106: };
107:
108: struct Frmr_frame {
109: octet address;
110: octet control;
111: octet frmr_control;
112: octet ORDER4(frmr_nr:3, frmr_f1_0:1, frmr_ns:3, frmr_f2_0:1);
113: octet ORDER5(frmr_0000:4, frmr_z:1, frmr_y:1, frmr_x:1, frmr_w:1);
114: };
115:
116: #define HDHEADERLN 2
117: #define MINFRLN 2 /* Minimum frame length. */
118:
119: struct Hdlc_frame {
120: octet address;
121: octet control;
122: octet info[3]; /* min for FRMR */
123: };
124:
125: #define SABM_CONTROL 057 /* B'00101111' */
126: #define UA_CONTROL 0143 /* B'01100011' */
127: #define DISC_CONTROL 0103 /* B'01000011' */
128: #define DM_CONTROL 017 /* B'00001111' */
129: #define FRMR_CONTROL 0207 /* B'10000111' */
130: #define RR_CONTROL 01 /* B'00000001' */
131: #define RNR_CONTROL 05 /* B'00000101' */
132: #define REJ_CONTROL 011 /* B'00001001' */
133:
134: #define POLLOFF 0
135: #define POLLON 1
136:
137: /* Define Link State constants. */
138:
139: #define INIT 0
140: #define DM_SENT 1
141: #define SABM_SENT 2
142: #define ABM 3
143: #define WAIT_SABM 4
144: #define WAIT_UA 5
145: #define DISC_SENT 6
146: #define DISCONNECTED 7
147: #define MAXSTATE 8
148:
149: /* The following constants are used in a switch statement to process
150: frames read from the communications line. */
151:
152: #define SABM 0 * MAXSTATE
153: #define DM 1 * MAXSTATE
154: #define DISC 2 * MAXSTATE
155: #define UA 3 * MAXSTATE
156: #define FRMR 4 * MAXSTATE
157: #define RR 5 * MAXSTATE
158: #define RNR 6 * MAXSTATE
159: #define REJ 7 * MAXSTATE
160: #define IFRAME 8 * MAXSTATE
161: #define ILLEGAL 9 * MAXSTATE
162:
163: #define T1 (3 * PR_SLOWHZ) /* IFRAME TIMEOUT - 3 seconds */
164: #define T3 (T1 / 2) /* RR generate timeout - 1.5 seconds */
165: #define N2 10
166: #define MODULUS 8
167: #define MAX_WINDOW_SIZE 7
168:
169: #define Z 0
170: #define Y 1
171: #define X 2
172: #define W 3
173: #define A 4
174:
175: #define TX 0
176: #define RX 1
177:
178: bool range_check ();
179: bool valid_nr ();
180: struct mbuf *hd_remove ();
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