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607ca46e DH |
1 | /* |
2 | * ppp-comp.h - Definitions for doing PPP packet compression. | |
3 | * | |
4 | * Copyright 1994-1998 Paul Mackerras. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * version 2 as published by the Free Software Foundation. | |
9 | */ | |
10 | #ifndef _UAPI_NET_PPP_COMP_H | |
11 | #define _UAPI_NET_PPP_COMP_H | |
12 | ||
13 | ||
14 | /* | |
15 | * CCP codes. | |
16 | */ | |
17 | ||
18 | #define CCP_CONFREQ 1 | |
19 | #define CCP_CONFACK 2 | |
20 | #define CCP_TERMREQ 5 | |
21 | #define CCP_TERMACK 6 | |
22 | #define CCP_RESETREQ 14 | |
23 | #define CCP_RESETACK 15 | |
24 | ||
25 | /* | |
26 | * Max # bytes for a CCP option | |
27 | */ | |
28 | ||
29 | #define CCP_MAX_OPTION_LENGTH 32 | |
30 | ||
31 | /* | |
32 | * Parts of a CCP packet. | |
33 | */ | |
34 | ||
35 | #define CCP_CODE(dp) ((dp)[0]) | |
36 | #define CCP_ID(dp) ((dp)[1]) | |
37 | #define CCP_LENGTH(dp) (((dp)[2] << 8) + (dp)[3]) | |
38 | #define CCP_HDRLEN 4 | |
39 | ||
40 | #define CCP_OPT_CODE(dp) ((dp)[0]) | |
41 | #define CCP_OPT_LENGTH(dp) ((dp)[1]) | |
42 | #define CCP_OPT_MINLEN 2 | |
43 | ||
44 | /* | |
45 | * Definitions for BSD-Compress. | |
46 | */ | |
47 | ||
48 | #define CI_BSD_COMPRESS 21 /* config. option for BSD-Compress */ | |
49 | #define CILEN_BSD_COMPRESS 3 /* length of config. option */ | |
50 | ||
51 | /* Macros for handling the 3rd byte of the BSD-Compress config option. */ | |
52 | #define BSD_NBITS(x) ((x) & 0x1F) /* number of bits requested */ | |
53 | #define BSD_VERSION(x) ((x) >> 5) /* version of option format */ | |
54 | #define BSD_CURRENT_VERSION 1 /* current version number */ | |
55 | #define BSD_MAKE_OPT(v, n) (((v) << 5) | (n)) | |
56 | ||
57 | #define BSD_MIN_BITS 9 /* smallest code size supported */ | |
58 | #define BSD_MAX_BITS 15 /* largest code size supported */ | |
59 | ||
60 | /* | |
61 | * Definitions for Deflate. | |
62 | */ | |
63 | ||
64 | #define CI_DEFLATE 26 /* config option for Deflate */ | |
65 | #define CI_DEFLATE_DRAFT 24 /* value used in original draft RFC */ | |
66 | #define CILEN_DEFLATE 4 /* length of its config option */ | |
67 | ||
68 | #define DEFLATE_MIN_SIZE 9 | |
69 | #define DEFLATE_MAX_SIZE 15 | |
70 | #define DEFLATE_METHOD_VAL 8 | |
71 | #define DEFLATE_SIZE(x) (((x) >> 4) + 8) | |
72 | #define DEFLATE_METHOD(x) ((x) & 0x0F) | |
73 | #define DEFLATE_MAKE_OPT(w) ((((w) - 8) << 4) + DEFLATE_METHOD_VAL) | |
74 | #define DEFLATE_CHK_SEQUENCE 0 | |
75 | ||
76 | /* | |
77 | * Definitions for MPPE. | |
78 | */ | |
79 | ||
80 | #define CI_MPPE 18 /* config option for MPPE */ | |
81 | #define CILEN_MPPE 6 /* length of config option */ | |
82 | ||
83 | /* | |
84 | * Definitions for other, as yet unsupported, compression methods. | |
85 | */ | |
86 | ||
87 | #define CI_PREDICTOR_1 1 /* config option for Predictor-1 */ | |
88 | #define CILEN_PREDICTOR_1 2 /* length of its config option */ | |
89 | #define CI_PREDICTOR_2 2 /* config option for Predictor-2 */ | |
90 | #define CILEN_PREDICTOR_2 2 /* length of its config option */ | |
91 | ||
92 | ||
93 | #endif /* _UAPI_NET_PPP_COMP_H */ |