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7bcd1bb8 | 1 | /*- |
fa58c82e | 2 | * Copyright (c) University of British Columbia, 1984 |
7bcd1bb8 | 3 | * Copyright (c) 1991 The Regents of the University of California. |
fa58c82e KS |
4 | * All rights reserved. |
5 | * | |
7bcd1bb8 KB |
6 | * This code is derived from software contributed to Berkeley by the |
7 | * Laboratory for Computation Vision and the Computer Science Department | |
fa58c82e KS |
8 | * of the University of British Columbia. |
9 | * | |
7bcd1bb8 | 10 | * %sccs.include.redist.c% |
fa58c82e | 11 | * |
7bcd1bb8 | 12 | * @(#)hdlc.h 7.4 (Berkeley) %G% |
fa58c82e | 13 | */ |
7bcd1bb8 | 14 | |
f44ae296 | 15 | #ifndef ORDER4 |
82237f5b KS |
16 | #define FALSE 0 |
17 | #define TRUE 1 | |
82237f5b | 18 | typedef u_char octet; |
f44ae296 KS |
19 | typedef char bool; |
20 | ||
21 | /* | |
22 | * HDLC Packet format definitions | |
23 | * This will eventually have to be rewritten without reference | |
24 | * to bit fields, to be compliant with ANSI C and alignment safe. | |
25 | */ | |
26 | ||
27 | #if BYTE_ORDER == BIG_ENDIAN | |
28 | #define ORDER4(a, b, c, d) a , b , c , d | |
29 | #define ORDER5(a, b, c, d, e) a , b , c , d , e | |
30 | #endif | |
31 | ||
32 | #if BYTE_ORDER == LITTLE_ENDIAN | |
33 | #define ORDER4(a, b, c, d) d , c , b , a | |
34 | #define ORDER5(a, b, c, d, e) e , d , c , b , a | |
35 | #endif | |
36 | #endif | |
82237f5b KS |
37 | |
38 | #define MAX_INFO_LEN 4096+3+4 | |
39 | #define ADDRESS_A 3 /* B'00000011' */ | |
40 | #define ADDRESS_B 1 /* B'00000001' */ | |
41 | ||
42 | struct Hdlc_iframe { | |
43 | octet address; | |
f44ae296 KS |
44 | octet ORDER4(nr:3, pf:1, ns:3, hdlc_0:1); |
45 | octet i_field[MAX_INFO_LEN]; | |
82237f5b KS |
46 | }; |
47 | ||
48 | struct Hdlc_sframe { | |
49 | octet address; | |
f44ae296 | 50 | octet ORDER4(nr:3, pf:1, s2:2, hdlc_01:2); |
82237f5b KS |
51 | }; |
52 | ||
53 | struct Hdlc_uframe { | |
54 | octet address; | |
f44ae296 | 55 | octet ORDER4(m3:3, pf:1, m2:2, hdlc_11:2); |
82237f5b KS |
56 | }; |
57 | ||
58 | struct Frmr_frame { | |
59 | octet address; | |
60 | octet control; | |
61 | octet frmr_control; | |
f44ae296 KS |
62 | octet ORDER4(frmr_nr:3, frmr_f1_0:1, frmr_ns:3, frmr_f2_0:1); |
63 | octet ORDER5(frmr_0000:4, frmr_z:1, frmr_y:1, frmr_x:1, frmr_w:1); | |
82237f5b KS |
64 | }; |
65 | ||
66 | #define HDHEADERLN 2 | |
67 | #define MINFRLN 2 /* Minimum frame length. */ | |
68 | ||
69 | struct Hdlc_frame { | |
70 | octet address; | |
71 | octet control; | |
f44ae296 | 72 | octet info[3]; /* min for FRMR */ |
82237f5b KS |
73 | }; |
74 | ||
75 | #define SABM_CONTROL 057 /* B'00101111' */ | |
76 | #define UA_CONTROL 0143 /* B'01100011' */ | |
77 | #define DISC_CONTROL 0103 /* B'01000011' */ | |
78 | #define DM_CONTROL 017 /* B'00001111' */ | |
79 | #define FRMR_CONTROL 0207 /* B'10000111' */ | |
80 | #define RR_CONTROL 01 /* B'00000001' */ | |
81 | #define RNR_CONTROL 05 /* B'00000101' */ | |
82 | #define REJ_CONTROL 011 /* B'00001001' */ | |
83 | ||
84 | #define POLLOFF 0 | |
85 | #define POLLON 1 | |
86 | ||
87 | /* Define Link State constants. */ | |
88 | ||
89 | #define INIT 0 | |
90 | #define DM_SENT 1 | |
91 | #define SABM_SENT 2 | |
92 | #define ABM 3 | |
93 | #define WAIT_SABM 4 | |
94 | #define WAIT_UA 5 | |
95 | #define DISC_SENT 6 | |
96 | #define DISCONNECTED 7 | |
97 | #define MAXSTATE 8 | |
98 | ||
99 | /* The following constants are used in a switch statement to process | |
100 | frames read from the communications line. */ | |
101 | ||
102 | #define SABM 0 * MAXSTATE | |
103 | #define DM 1 * MAXSTATE | |
104 | #define DISC 2 * MAXSTATE | |
105 | #define UA 3 * MAXSTATE | |
106 | #define FRMR 4 * MAXSTATE | |
107 | #define RR 5 * MAXSTATE | |
108 | #define RNR 6 * MAXSTATE | |
109 | #define REJ 7 * MAXSTATE | |
110 | #define IFRAME 8 * MAXSTATE | |
111 | #define ILLEGAL 9 * MAXSTATE | |
112 | ||
113 | #define T1 (3 * PR_SLOWHZ) /* IFRAME TIMEOUT - 3 seconds */ | |
114 | #define T3 (T1 / 2) /* RR generate timeout - 1.5 seconds */ | |
115 | #define N2 10 | |
116 | #define MODULUS 8 | |
117 | #define MAX_WINDOW_SIZE 7 | |
118 | ||
119 | #define Z 0 | |
120 | #define Y 1 | |
121 | #define X 2 | |
122 | #define W 3 | |
123 | #define A 4 | |
124 | ||
125 | #define TX 0 | |
126 | #define RX 1 | |
127 | ||
128 | bool range_check (); | |
129 | bool valid_nr (); | |
130 | struct mbuf *hd_remove (); |