ppp-comp.h (2526B) - Raw
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 */