152 lines
5.2 KiB
C
152 lines
5.2 KiB
C
/*
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* ppp_comp.h - Definitions for doing PPP packet compression.
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*
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* Copyright (c) 1994 The Australian National University.
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* All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, provided that the above copyright
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* notice appears in all copies. This software is provided without any
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* warranty, express or implied. The Australian National University
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* makes no representations about the suitability of this software for
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* any purpose.
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*
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* IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
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* PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
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* THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
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* OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
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* OR MODIFICATIONS.
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*
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* $FreeBSD: src/sys/net/ppp_comp.h,v 1.11 2002/03/24 09:34:04 bde Exp $
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*/
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#ifndef _NET_PPP_COMP_H
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#define _NET_PPP_COMP_H
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/*
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* Structure giving methods for compression/decompression.
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*/
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#ifdef PACKETPTR
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struct compressor {
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int compress_proto; /* CCP compression protocol number */
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/* Allocate space for a compressor (transmit side) */
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void *(*comp_alloc)(u_char *options, int opt_len);
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/* Free space used by a compressor */
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void (*comp_free)(void *state);
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/* Initialize a compressor */
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int (*comp_init)(void *state, u_char *options, int opt_len,
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int unit, int hdrlen, int debug);
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/* Reset a compressor */
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void (*comp_reset)(void *state);
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/* Compress a packet */
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int (*compress)(void *state, PACKETPTR *mret, PACKETPTR mp,
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int orig_len, int max_len);
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/* Return compression statistics */
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void (*comp_stat)(void *state, struct compstat *stats);
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/* Allocate space for a decompressor (receive side) */
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void *(*decomp_alloc)(u_char *options, int opt_len);
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/* Free space used by a decompressor */
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void (*decomp_free)(void *state);
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/* Initialize a decompressor */
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int (*decomp_init)(void *state, u_char *options, int opt_len,
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int unit, int hdrlen, int mru, int debug);
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/* Reset a decompressor */
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void (*decomp_reset)(void *state);
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/* Decompress a packet. */
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int (*decompress)(void *state, PACKETPTR mp, PACKETPTR *dmpp);
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/* Update state for an incompressible packet received */
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void (*incomp)(void *state, PACKETPTR mp);
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/* Return decompression statistics */
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void (*decomp_stat)(void *state, struct compstat *stats);
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};
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#endif /* PACKETPTR */
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/*
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* Return values for decompress routine.
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* We need to make these distinctions so that we can disable certain
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* useful functionality, namely sending a CCP reset-request as a result
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* of an error detected after decompression. This is to avoid infringing
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* a patent held by Motorola.
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* Don't you just lurve software patents.
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*/
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#define DECOMP_OK 0 /* everything went OK */
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#define DECOMP_ERROR 1 /* error detected before decomp. */
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#define DECOMP_FATALERROR 2 /* error detected after decomp. */
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/*
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* CCP codes.
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*/
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#define CCP_CONFREQ 1
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#define CCP_CONFACK 2
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#define CCP_TERMREQ 5
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#define CCP_TERMACK 6
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#define CCP_RESETREQ 14
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#define CCP_RESETACK 15
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/*
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* Max # bytes for a CCP option
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*/
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#define CCP_MAX_OPTION_LENGTH 32
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/*
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* Parts of a CCP packet.
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*/
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#define CCP_CODE(dp) ((dp)[0])
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#define CCP_ID(dp) ((dp)[1])
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#define CCP_LENGTH(dp) (((dp)[2] << 8) + (dp)[3])
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#define CCP_HDRLEN 4
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#define CCP_OPT_CODE(dp) ((dp)[0])
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#define CCP_OPT_LENGTH(dp) ((dp)[1])
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#define CCP_OPT_MINLEN 2
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/*
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* Definitions for BSD-Compress.
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*/
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#define CI_BSD_COMPRESS 21 /* config. option for BSD-Compress */
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#define CILEN_BSD_COMPRESS 3 /* length of config. option */
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/* Macros for handling the 3rd byte of the BSD-Compress config option. */
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#define BSD_NBITS(x) ((x) & 0x1F) /* number of bits requested */
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#define BSD_VERSION(x) ((x) >> 5) /* version of option format */
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#define BSD_CURRENT_VERSION 1 /* current version number */
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#define BSD_MAKE_OPT(v, n) (((v) << 5) | (n))
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#define BSD_MIN_BITS 9 /* smallest code size supported */
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#define BSD_MAX_BITS 15 /* largest code size supported */
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/*
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* Definitions for Deflate.
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*/
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#define CI_DEFLATE 26 /* config option for Deflate */
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#define CI_DEFLATE_DRAFT 24 /* value used in original draft RFC */
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#define CILEN_DEFLATE 4 /* length of its config option */
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#define DEFLATE_MIN_SIZE 8
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#define DEFLATE_MAX_SIZE 15
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#define DEFLATE_METHOD_VAL 8
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#define DEFLATE_SIZE(x) (((x) >> 4) + DEFLATE_MIN_SIZE)
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#define DEFLATE_METHOD(x) ((x) & 0x0F)
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#define DEFLATE_MAKE_OPT(w) ((((w) - DEFLATE_MIN_SIZE) << 4) \
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+ DEFLATE_METHOD_VAL)
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#define DEFLATE_CHK_SEQUENCE 0
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/*
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* Definitions for other, as yet unsupported, compression methods.
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*/
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#define CI_PREDICTOR_1 1 /* config option for Predictor-1 */
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#define CILEN_PREDICTOR_1 2 /* length of its config option */
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#define CI_PREDICTOR_2 2 /* config option for Predictor-2 */
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#define CILEN_PREDICTOR_2 2 /* length of its config option */
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#endif /* _NET_PPP_COMP_H */
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