linux-headers (unknown)
1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 /*
3 * ppp-comp.h - Definitions for doing PPP packet compression.
4 *
5 * Copyright 1994-1998 Paul Mackerras.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * version 2 as published by the Free Software Foundation.
10 */
11 #ifndef _NET_PPP_COMP_H
12 #define _NET_PPP_COMP_H
13
14
15 /*
16 * CCP codes.
17 */
18
19 #define CCP_CONFREQ 1
20 #define CCP_CONFACK 2
21 #define CCP_TERMREQ 5
22 #define CCP_TERMACK 6
23 #define CCP_RESETREQ 14
24 #define CCP_RESETACK 15
25
26 /*
27 * Max # bytes for a CCP option
28 */
29
30 #define CCP_MAX_OPTION_LENGTH 32
31
32 /*
33 * Parts of a CCP packet.
34 */
35
36 #define CCP_CODE(dp) ((dp)[0])
37 #define CCP_ID(dp) ((dp)[1])
38 #define CCP_LENGTH(dp) (((dp)[2] << 8) + (dp)[3])
39 #define CCP_HDRLEN 4
40
41 #define CCP_OPT_CODE(dp) ((dp)[0])
42 #define CCP_OPT_LENGTH(dp) ((dp)[1])
43 #define CCP_OPT_MINLEN 2
44
45 /*
46 * Definitions for BSD-Compress.
47 */
48
49 #define CI_BSD_COMPRESS 21 /* config. option for BSD-Compress */
50 #define CILEN_BSD_COMPRESS 3 /* length of config. option */
51
52 /* Macros for handling the 3rd byte of the BSD-Compress config option. */
53 #define BSD_NBITS(x) ((x) & 0x1F) /* number of bits requested */
54 #define BSD_VERSION(x) ((x) >> 5) /* version of option format */
55 #define BSD_CURRENT_VERSION 1 /* current version number */
56 #define BSD_MAKE_OPT(v, n) (((v) << 5) | (n))
57
58 #define BSD_MIN_BITS 9 /* smallest code size supported */
59 #define BSD_MAX_BITS 15 /* largest code size supported */
60
61 /*
62 * Definitions for Deflate.
63 */
64
65 #define CI_DEFLATE 26 /* config option for Deflate */
66 #define CI_DEFLATE_DRAFT 24 /* value used in original draft RFC */
67 #define CILEN_DEFLATE 4 /* length of its config option */
68
69 #define DEFLATE_MIN_SIZE 9
70 #define DEFLATE_MAX_SIZE 15
71 #define DEFLATE_METHOD_VAL 8
72 #define DEFLATE_SIZE(x) (((x) >> 4) + 8)
73 #define DEFLATE_METHOD(x) ((x) & 0x0F)
74 #define DEFLATE_MAKE_OPT(w) ((((w) - 8) << 4) + DEFLATE_METHOD_VAL)
75 #define DEFLATE_CHK_SEQUENCE 0
76
77 /*
78 * Definitions for MPPE.
79 */
80
81 #define CI_MPPE 18 /* config option for MPPE */
82 #define CILEN_MPPE 6 /* length of config option */
83
84 /*
85 * Definitions for other, as yet unsupported, compression methods.
86 */
87
88 #define CI_PREDICTOR_1 1 /* config option for Predictor-1 */
89 #define CILEN_PREDICTOR_1 2 /* length of its config option */
90 #define CI_PREDICTOR_2 2 /* config option for Predictor-2 */
91 #define CILEN_PREDICTOR_2 2 /* length of its config option */
92
93
94 #endif /* _NET_PPP_COMP_H */
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