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| Dir : //usr/include/linux/ppp-comp.h |
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ /* * ppp-comp.h - Definitions for doing PPP packet compression. * * Copyright 1994-1998 Paul Mackerras. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. */ #ifndef _NET_PPP_COMP_H #define _NET_PPP_COMP_H /* * CCP codes. */ #define CCP_CONFREQ 1 #define CCP_CONFACK 2 #define CCP_TERMREQ 5 #define CCP_TERMACK 6 #define CCP_RESETREQ 14 #define CCP_RESETACK 15 /* * Max # bytes for a CCP option */ #define CCP_MAX_OPTION_LENGTH 32 /* * Parts of a CCP packet. */ #define CCP_CODE(dp) ((dp)[0]) #define CCP_ID(dp) ((dp)[1]) #define CCP_LENGTH(dp) (((dp)[2] << 8) + (dp)[3]) #define CCP_HDRLEN 4 #define CCP_OPT_CODE(dp) ((dp)[0]) #define CCP_OPT_LENGTH(dp) ((dp)[1]) #define CCP_OPT_MINLEN 2 /* * Definitions for BSD-Compress. */ #define CI_BSD_COMPRESS 21 /* config. option for BSD-Compress */ #define CILEN_BSD_COMPRESS 3 /* length of config. option */ /* Macros for handling the 3rd byte of the BSD-Compress config option. */ #define BSD_NBITS(x) ((x) & 0x1F) /* number of bits requested */ #define BSD_VERSION(x) ((x) >> 5) /* version of option format */ #define BSD_CURRENT_VERSION 1 /* current version number */ #define BSD_MAKE_OPT(v, n) (((v) << 5) | (n)) #define BSD_MIN_BITS 9 /* smallest code size supported */ #define BSD_MAX_BITS 15 /* largest code size supported */ /* * Definitions for Deflate. */ #define CI_DEFLATE 26 /* config option for Deflate */ #define CI_DEFLATE_DRAFT 24 /* value used in original draft RFC */ #define CILEN_DEFLATE 4 /* length of its config option */ #define DEFLATE_MIN_SIZE 9 #define DEFLATE_MAX_SIZE 15 #define DEFLATE_METHOD_VAL 8 #define DEFLATE_SIZE(x) (((x) >> 4) + 8) #define DEFLATE_METHOD(x) ((x) & 0x0F) #define DEFLATE_MAKE_OPT(w) ((((w) - 8) << 4) + DEFLATE_METHOD_VAL) #define DEFLATE_CHK_SEQUENCE 0 /* * Definitions for MPPE. */ #define CI_MPPE 18 /* config option for MPPE */ #define CILEN_MPPE 6 /* length of config option */ /* * Definitions for other, as yet unsupported, compression methods. */ #define CI_PREDICTOR_1 1 /* config option for Predictor-1 */ #define CILEN_PREDICTOR_1 2 /* length of its config option */ #define CI_PREDICTOR_2 2 /* config option for Predictor-2 */ #define CILEN_PREDICTOR_2 2 /* length of its config option */ #endif /* _NET_PPP_COMP_H */