1/* 2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28/* 29 * ppp_comp.h - Definitions for doing PPP packet compression. 30 * 31 * Copyright (c) 1994 The Australian National University. 32 * All rights reserved. 33 * 34 * Permission to use, copy, modify, and distribute this software and its 35 * documentation is hereby granted, provided that the above copyright 36 * notice appears in all copies. This software is provided without any 37 * warranty, express or implied. The Australian National University 38 * makes no representations about the suitability of this software for 39 * any purpose. 40 * 41 * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY 42 * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 43 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF 44 * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY 45 * OF SUCH DAMAGE. 46 * 47 * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES, 48 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 49 * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 50 * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO 51 * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, 52 * OR MODIFICATIONS. 53 * 54 */ 55 56#ifndef _NET_PPP_COMP_H 57#define _NET_PPP_COMP_H 58#ifdef KERNEL_PRIVATE 59/* 60 * The following symbols control whether we include code for 61 * various compression methods. 62 */ 63#ifndef DO_BSD_COMPRESS 64#define DO_BSD_COMPRESS 1 /* by default, include BSD-Compress */ 65#endif 66#ifndef DO_DEFLATE 67#define DO_DEFLATE 1 /* by default, include Deflate */ 68#endif 69#define DO_PREDICTOR_1 0 70#define DO_PREDICTOR_2 0 71 72/* 73 * Structure giving methods for compression/decompression. 74 */ 75#if PACKETPTR 76struct compressor { 77 int compress_proto; /* CCP compression protocol number */ 78 79 /* Allocate space for a compressor (transmit side) */ 80 void *(*comp_alloc)(u_char *options, int opt_len); 81 /* Free space used by a compressor */ 82 void (*comp_free)(void *state); 83 /* Initialize a compressor */ 84 int (*comp_init)(void *state, u_char *options, int opt_len, 85 int unit, int hdrlen, int debug); 86 /* Reset a compressor */ 87 void (*comp_reset)(void *state); 88 /* Compress a packet */ 89 int (*compress)(void *state, PACKETPTR *mret, 90 PACKETPTR mp, int orig_len, int max_len); 91 /* Return compression statistics */ 92 void (*comp_stat)(void *state, struct compstat *stats); 93 94 /* Allocate space for a decompressor (receive side) */ 95 void *(*decomp_alloc)(u_char *options, int opt_len); 96 /* Free space used by a decompressor */ 97 void (*decomp_free)(void *state); 98 /* Initialize a decompressor */ 99 int (*decomp_init)(void *state, u_char *options, int opt_len, 100 int unit, int hdrlen, int mru, int debug); 101 /* Reset a decompressor */ 102 void (*decomp_reset)(void *state); 103 /* Decompress a packet. */ 104 int (*decompress)(void *state, PACKETPTR mp, PACKETPTR *dmpp); 105 /* Update state for an incompressible packet received */ 106 void (*incomp)(void *state, PACKETPTR mp); 107 /* Return decompression statistics */ 108 void (*decomp_stat)(void *state, struct compstat *stats); 109}; 110#endif /* PACKETPTR */ 111 112/* 113 * Return values for decompress routine. 114 * We need to make these distinctions so that we can disable certain 115 * useful functionality, namely sending a CCP reset-request as a result 116 * of an error detected after decompression. This is to avoid infringing 117 * a patent held by Motorola. 118 * Don't you just lurve software patents. 119 */ 120#define DECOMP_OK 0 /* everything went OK */ 121#define DECOMP_ERROR 1 /* error detected before decomp. */ 122#define DECOMP_FATALERROR 2 /* error detected after decomp. */ 123 124/* 125 * CCP codes. 126 */ 127#define CCP_CONFREQ 1 128#define CCP_CONFACK 2 129#define CCP_TERMREQ 5 130#define CCP_TERMACK 6 131#define CCP_RESETREQ 14 132#define CCP_RESETACK 15 133 134/* 135 * Max # bytes for a CCP option 136 */ 137#define CCP_MAX_OPTION_LENGTH 32 138 139/* 140 * Parts of a CCP packet. 141 */ 142#define CCP_CODE(dp) ((dp)[0]) 143#define CCP_ID(dp) ((dp)[1]) 144#define CCP_LENGTH(dp) (((dp)[2] << 8) + (dp)[3]) 145#define CCP_HDRLEN 4 146 147#define CCP_OPT_CODE(dp) ((dp)[0]) 148#define CCP_OPT_LENGTH(dp) ((dp)[1]) 149#define CCP_OPT_MINLEN 2 150 151/* 152 * Definitions for BSD-Compress. 153 */ 154#define CI_BSD_COMPRESS 21 /* config. option for BSD-Compress */ 155#define CILEN_BSD_COMPRESS 3 /* length of config. option */ 156 157/* Macros for handling the 3rd byte of the BSD-Compress config option. */ 158#define BSD_NBITS(x) ((x) & 0x1F) /* number of bits requested */ 159#define BSD_VERSION(x) ((x) >> 5) /* version of option format */ 160#define BSD_CURRENT_VERSION 1 /* current version number */ 161#define BSD_MAKE_OPT(v, n) (((v) << 5) | (n)) 162 163#define BSD_MIN_BITS 9 /* smallest code size supported */ 164#define BSD_MAX_BITS 15 /* largest code size supported */ 165 166/* 167 * Definitions for Deflate. 168 */ 169#define CI_DEFLATE 26 /* config option for Deflate */ 170#define CI_DEFLATE_DRAFT 24 /* value used in original draft RFC */ 171#define CILEN_DEFLATE 4 /* length of its config option */ 172 173#define DEFLATE_MIN_SIZE 8 174#define DEFLATE_MAX_SIZE 15 175#define DEFLATE_METHOD_VAL 8 176#define DEFLATE_SIZE(x) (((x) >> 4) + DEFLATE_MIN_SIZE) 177#define DEFLATE_METHOD(x) ((x) & 0x0F) 178#define DEFLATE_MAKE_OPT(w) ((((w) - DEFLATE_MIN_SIZE) << 4) \ 179 + DEFLATE_METHOD_VAL) 180#define DEFLATE_CHK_SEQUENCE 0 181 182/* 183 * Definitions for other, as yet unsupported, compression methods. 184 */ 185#define CI_PREDICTOR_1 1 /* config option for Predictor-1 */ 186#define CILEN_PREDICTOR_1 2 /* length of its config option */ 187#define CI_PREDICTOR_2 2 /* config option for Predictor-2 */ 188#define CILEN_PREDICTOR_2 2 /* length of its config option */ 189 190#endif /* KERNEL_PRIVATE */ 191#endif /* _NET_PPP_COMP_H */ 192