| David Howells | 607ca46 | 2012-10-13 10:46:48 +0100 | [diff] [blame] | 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 */ |