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1.1 root 1: /*-
2: * Copyright (c) University of British Columbia, 1984
3: * Copyright (c) 1991 The Regents of the University of California.
4: * All rights reserved.
5: *
6: * This code is derived from software contributed to Berkeley by the
7: * Laboratory for Computation Vision and the Computer Science Department
8: * of the University of British Columbia.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: * 3. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
20: * This product includes software developed by the University of
21: * California, Berkeley and its contributors.
22: * 4. Neither the name of the University nor the names of its contributors
23: * may be used to endorse or promote products derived from this software
24: * without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36: * SUCH DAMAGE.
37: *
1.1.1.2 ! root 38: * from: @(#)hdlc.h 7.4 (Berkeley) 5/6/91
! 39: * hdlc.h,v 1.3 1993/05/20 04:12:11 cgd Exp
1.1 root 40: */
41:
1.1.1.2 ! root 42: #ifndef _NETCCITT_HDLC_H_
! 43: #define _NETCCITT_HDLC_H_
! 44:
1.1 root 45: #ifndef ORDER4
46: #define FALSE 0
47: #define TRUE 1
48: typedef u_char octet;
49: typedef char bool;
50:
51: /*
52: * HDLC Packet format definitions
53: * This will eventually have to be rewritten without reference
54: * to bit fields, to be compliant with ANSI C and alignment safe.
55: */
56:
57: #if BYTE_ORDER == BIG_ENDIAN
58: #define ORDER4(a, b, c, d) a , b , c , d
59: #define ORDER5(a, b, c, d, e) a , b , c , d , e
60: #endif
61:
62: #if BYTE_ORDER == LITTLE_ENDIAN
63: #define ORDER4(a, b, c, d) d , c , b , a
64: #define ORDER5(a, b, c, d, e) e , d , c , b , a
65: #endif
66: #endif
67:
68: #define MAX_INFO_LEN 4096+3+4
69: #define ADDRESS_A 3 /* B'00000011' */
70: #define ADDRESS_B 1 /* B'00000001' */
71:
72: struct Hdlc_iframe {
73: octet address;
74: octet ORDER4(nr:3, pf:1, ns:3, hdlc_0:1);
75: octet i_field[MAX_INFO_LEN];
76: };
77:
78: struct Hdlc_sframe {
79: octet address;
80: octet ORDER4(nr:3, pf:1, s2:2, hdlc_01:2);
81: };
82:
83: struct Hdlc_uframe {
84: octet address;
85: octet ORDER4(m3:3, pf:1, m2:2, hdlc_11:2);
86: };
87:
88: struct Frmr_frame {
89: octet address;
90: octet control;
91: octet frmr_control;
92: octet ORDER4(frmr_nr:3, frmr_f1_0:1, frmr_ns:3, frmr_f2_0:1);
93: octet ORDER5(frmr_0000:4, frmr_z:1, frmr_y:1, frmr_x:1, frmr_w:1);
94: };
95:
96: #define HDHEADERLN 2
97: #define MINFRLN 2 /* Minimum frame length. */
98:
99: struct Hdlc_frame {
100: octet address;
101: octet control;
102: octet info[3]; /* min for FRMR */
103: };
104:
105: #define SABM_CONTROL 057 /* B'00101111' */
106: #define UA_CONTROL 0143 /* B'01100011' */
107: #define DISC_CONTROL 0103 /* B'01000011' */
108: #define DM_CONTROL 017 /* B'00001111' */
109: #define FRMR_CONTROL 0207 /* B'10000111' */
110: #define RR_CONTROL 01 /* B'00000001' */
111: #define RNR_CONTROL 05 /* B'00000101' */
112: #define REJ_CONTROL 011 /* B'00001001' */
113:
114: #define POLLOFF 0
115: #define POLLON 1
116:
117: /* Define Link State constants. */
118:
119: #define INIT 0
120: #define DM_SENT 1
121: #define SABM_SENT 2
122: #define ABM 3
123: #define WAIT_SABM 4
124: #define WAIT_UA 5
125: #define DISC_SENT 6
126: #define DISCONNECTED 7
127: #define MAXSTATE 8
128:
129: /* The following constants are used in a switch statement to process
130: frames read from the communications line. */
131:
132: #define SABM 0 * MAXSTATE
133: #define DM 1 * MAXSTATE
134: #define DISC 2 * MAXSTATE
135: #define UA 3 * MAXSTATE
136: #define FRMR 4 * MAXSTATE
137: #define RR 5 * MAXSTATE
138: #define RNR 6 * MAXSTATE
139: #define REJ 7 * MAXSTATE
140: #define IFRAME 8 * MAXSTATE
141: #define ILLEGAL 9 * MAXSTATE
142:
143: #define T1 (3 * PR_SLOWHZ) /* IFRAME TIMEOUT - 3 seconds */
144: #define T3 (T1 / 2) /* RR generate timeout - 1.5 seconds */
145: #define N2 10
146: #define MODULUS 8
147: #define MAX_WINDOW_SIZE 7
148:
149: #define Z 0
150: #define Y 1
151: #define X 2
152: #define W 3
153: #define A 4
154:
155: #define TX 0
156: #define RX 1
157:
158: bool range_check ();
159: bool valid_nr ();
160: struct mbuf *hd_remove ();
1.1.1.2 ! root 161:
! 162: #endif /* !_NETCCITT_HDLC_H_ */
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