| 1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
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| 2 | /* |
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| 3 | * ppp-comp.h - Definitions for doing PPP packet compression. |
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| 4 | * |
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| 5 | * Copyright 1994-1998 Paul Mackerras. |
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| 6 | * |
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| 7 | * This program is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU General Public License |
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| 9 | * version 2 as published by the Free Software Foundation. |
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| 10 | */ |
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| 11 | #ifndef _UAPI_NET_PPP_COMP_H |
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| 12 | #define _UAPI_NET_PPP_COMP_H |
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| 13 | |
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| 14 | |
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| 15 | /* |
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| 16 | * CCP codes. |
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| 17 | */ |
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| 18 | |
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| 19 | #define CCP_CONFREQ 1 |
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| 20 | #define CCP_CONFACK 2 |
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| 21 | #define CCP_TERMREQ 5 |
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| 22 | #define CCP_TERMACK 6 |
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| 23 | #define CCP_RESETREQ 14 |
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| 24 | #define CCP_RESETACK 15 |
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| 25 | |
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| 26 | /* |
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| 27 | * Max # bytes for a CCP option |
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| 28 | */ |
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| 29 | |
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| 30 | #define CCP_MAX_OPTION_LENGTH 32 |
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| 31 | |
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| 32 | /* |
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| 33 | * Parts of a CCP packet. |
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| 34 | */ |
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| 35 | |
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| 36 | #define CCP_CODE(dp) ((dp)[0]) |
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| 37 | #define CCP_ID(dp) ((dp)[1]) |
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| 38 | #define CCP_LENGTH(dp) (((dp)[2] << 8) + (dp)[3]) |
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| 39 | #define CCP_HDRLEN 4 |
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| 40 | |
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| 41 | #define CCP_OPT_CODE(dp) ((dp)[0]) |
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| 42 | #define CCP_OPT_LENGTH(dp) ((dp)[1]) |
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| 43 | #define CCP_OPT_MINLEN 2 |
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| 44 | |
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| 45 | /* |
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| 46 | * Definitions for BSD-Compress. |
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| 47 | */ |
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| 48 | |
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| 49 | #define CI_BSD_COMPRESS 21 /* config. option for BSD-Compress */ |
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| 50 | #define CILEN_BSD_COMPRESS 3 /* length of config. option */ |
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| 51 | |
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| 52 | /* Macros for handling the 3rd byte of the BSD-Compress config option. */ |
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| 53 | #define BSD_NBITS(x) ((x) & 0x1F) /* number of bits requested */ |
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| 54 | #define BSD_VERSION(x) ((x) >> 5) /* version of option format */ |
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| 55 | #define BSD_CURRENT_VERSION 1 /* current version number */ |
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| 56 | #define BSD_MAKE_OPT(v, n) (((v) << 5) | (n)) |
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| 57 | |
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| 58 | #define BSD_MIN_BITS 9 /* smallest code size supported */ |
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| 59 | #define BSD_MAX_BITS 15 /* largest code size supported */ |
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| 60 | |
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| 61 | /* |
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| 62 | * Definitions for Deflate. |
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| 63 | */ |
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| 64 | |
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| 65 | #define CI_DEFLATE 26 /* config option for Deflate */ |
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| 66 | #define CI_DEFLATE_DRAFT 24 /* value used in original draft RFC */ |
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| 67 | #define CILEN_DEFLATE 4 /* length of its config option */ |
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| 68 | |
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| 69 | #define DEFLATE_MIN_SIZE 9 |
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| 70 | #define DEFLATE_MAX_SIZE 15 |
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| 71 | #define DEFLATE_METHOD_VAL 8 |
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| 72 | #define DEFLATE_SIZE(x) (((x) >> 4) + 8) |
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| 73 | #define DEFLATE_METHOD(x) ((x) & 0x0F) |
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| 74 | #define DEFLATE_MAKE_OPT(w) ((((w) - 8) << 4) + DEFLATE_METHOD_VAL) |
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| 75 | #define DEFLATE_CHK_SEQUENCE 0 |
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| 76 | |
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| 77 | /* |
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| 78 | * Definitions for MPPE. |
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| 79 | */ |
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| 80 | |
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| 81 | #define CI_MPPE 18 /* config option for MPPE */ |
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| 82 | #define CILEN_MPPE 6 /* length of config option */ |
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| 83 | |
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| 84 | /* |
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| 85 | * Definitions for other, as yet unsupported, compression methods. |
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| 86 | */ |
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| 87 | |
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| 88 | #define CI_PREDICTOR_1 1 /* config option for Predictor-1 */ |
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| 89 | #define CILEN_PREDICTOR_1 2 /* length of its config option */ |
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| 90 | #define CI_PREDICTOR_2 2 /* config option for Predictor-2 */ |
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| 91 | #define CILEN_PREDICTOR_2 2 /* length of its config option */ |
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| 92 | |
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| 93 | |
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| 94 | #endif /* _UAPI_NET_PPP_COMP_H */ |
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| 95 | |
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