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/* * ppp-comp.h - Definitions for doing PPP packet compression. * * Copyright (c) 1994 The Australian National University. * All rights reserved. * * Permission to use, copy, modify, and distribute this software and its * documentation is hereby granted, provided that the above copyright * notice appears in all copies. This software is provided without any * warranty, express or implied. The Australian National University * makes no representations about the suitability of this software for * any purpose. * * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY * OF SUCH DAMAGE. * * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, * OR MODIFICATIONS. * * $Id: ppp-comp.h,v 1.6 1997/11/27 06:04:44 paulus Exp $ */ /* * ==FILEVERSION 980319== * * NOTE TO MAINTAINERS: * If you modify this file at all, please set the above date. * ppp-comp.h is shipped with a PPP distribution as well as with the kernel; * if everyone increases the FILEVERSION number above, then scripts * can do the right thing when deciding whether to install a new ppp-comp.h * file. Don't change the format of that line otherwise, so the * installation script can recognize it. */ #ifndef _NET_PPP_COMP_H #define _NET_PPP_COMP_H struct module; /* * The following symbols control whether we include code for * various compression methods. */ #ifndef DO_BSD_COMPRESS #define DO_BSD_COMPRESS 1 /* by default, include BSD-Compress */ #endif #ifndef DO_DEFLATE #define DO_DEFLATE 1 /* by default, include Deflate */ #endif #define DO_PREDICTOR_1 0 #define DO_PREDICTOR_2 0 /* * Structure giving methods for compression/decompression. */ struct compressor { int compress_proto; /* CCP compression protocol number */ /* Allocate space for a compressor (transmit side) */ void *(*comp_alloc) (unsigned char *options, int opt_len); /* Free space used by a compressor */ void (*comp_free) (void *state); /* Initialize a compressor */ int (*comp_init) (void *state, unsigned char *options, int opt_len, int unit, int opthdr, int debug); /* Reset a compressor */ void (*comp_reset) (void *state); /* Compress a packet */ int (*compress) (void *state, unsigned char *rptr, unsigned char *obuf, int isize, int osize); /* Return compression statistics */ void (*comp_stat) (void *state, struct compstat *stats); /* Allocate space for a decompressor (receive side) */ void *(*decomp_alloc) (unsigned char *options, int opt_len); /* Free space used by a decompressor */ void (*decomp_free) (void *state); /* Initialize a decompressor */ int (*decomp_init) (void *state, unsigned char *options, int opt_len, int unit, int opthdr, int mru, int debug); /* Reset a decompressor */ void (*decomp_reset) (void *state); /* Decompress a packet. */ int (*decompress) (void *state, unsigned char *ibuf, int isize, unsigned char *obuf, int osize); /* Update state for an incompressible packet received */ void (*incomp) (void *state, unsigned char *ibuf, int icnt); /* Return decompression statistics */ void (*decomp_stat) (void *state, struct compstat *stats); /* Used in locking compressor modules */ struct module *owner; /* Extra skb space needed by the compressor algorithm */ unsigned int comp_extra; }; /* * The return value from decompress routine is the length of the * decompressed packet if successful, otherwise DECOMP_ERROR * or DECOMP_FATALERROR if an error occurred. * * We need to make this distinction so that we can disable certain * useful functionality, namely sending a CCP reset-request as a result * of an error detected after decompression. This is to avoid infringing * a patent held by Motorola. * Don't you just lurve software patents. */ #define DECOMP_ERROR -1 /* error detected before decomp. */ #define DECOMP_FATALERROR -2 /* error detected after decomp. */ /* * 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 */ #ifdef __KERNEL__ extern int ppp_register_compressor(struct compressor *); extern void ppp_unregister_compressor(struct compressor *); #endif /* __KERNEL__ */ #endif /* _NET_PPP_COMP_H */