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 */ 94
