[apple/xnu.git] / bsd / net / ppp_comp.h

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * 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.
 *
 */

#ifndef _NET_PPP_COMP_H
#define _NET_PPP_COMP_H

/*
 * 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.
 */
#if PACKETPTR
struct compressor {
	int	compress_proto;	/* CCP compression protocol number */

	/* Allocate space for a compressor (transmit side) */
	void	*(*comp_alloc) __P((u_char *options, int opt_len));
	/* Free space used by a compressor */
	void	(*comp_free) __P((void *state));
	/* Initialize a compressor */
	int	(*comp_init) __P((void *state, u_char *options, int opt_len,
				  int unit, int hdrlen, int debug));
	/* Reset a compressor */
	void	(*comp_reset) __P((void *state));
	/* Compress a packet */
	int	(*compress) __P((void *state, PACKETPTR *mret,
				 PACKETPTR mp, int orig_len, int max_len));
	/* Return compression statistics */
	void	(*comp_stat) __P((void *state, struct compstat *stats));

	/* Allocate space for a decompressor (receive side) */
	void	*(*decomp_alloc) __P((u_char *options, int opt_len));
	/* Free space used by a decompressor */
	void	(*decomp_free) __P((void *state));
	/* Initialize a decompressor */
	int	(*decomp_init) __P((void *state, u_char *options, int opt_len,
				    int unit, int hdrlen, int mru, int debug));
	/* Reset a decompressor */
	void	(*decomp_reset) __P((void *state));
	/* Decompress a packet. */
	int	(*decompress) __P((void *state, PACKETPTR mp,
				   PACKETPTR *dmpp));
	/* Update state for an incompressible packet received */
	void	(*incomp) __P((void *state, PACKETPTR mp));
	/* Return decompression statistics */
	void	(*decomp_stat) __P((void *state, struct compstat *stats));
};
#endif /* PACKETPTR */

/*
 * Return values for decompress routine.
 * We need to make these distinctions 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_OK		0	/* everything went OK */
#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	8
#define DEFLATE_MAX_SIZE	15
#define DEFLATE_METHOD_VAL	8
#define DEFLATE_SIZE(x)		(((x) >> 4) + DEFLATE_MIN_SIZE)
#define DEFLATE_METHOD(x)	((x) & 0x0F)
#define DEFLATE_MAKE_OPT(w)	((((w) - DEFLATE_MIN_SIZE) << 4) \
				 + DEFLATE_METHOD_VAL)
#define DEFLATE_CHK_SEQUENCE	0

/*
 * 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 */
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
	11	*
	12	* This Original Code and all software distributed under the License are
	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* ppp_comp.h - Definitions for doing PPP packet compression.
	24	*
	25	* Copyright (c) 1994 The Australian National University.
	26	* All rights reserved.
	27	*
	28	* Permission to use, copy, modify, and distribute this software and its
	29	* documentation is hereby granted, provided that the above copyright
	30	* notice appears in all copies. This software is provided without any
	31	* warranty, express or implied. The Australian National University
	32	* makes no representations about the suitability of this software for
	33	* any purpose.
	34	*
	35	* IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
	36	* PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
	37	* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
	38	* THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
	39	* OF SUCH DAMAGE.
	40	*
	41	* THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
	42	* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
	43	* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
	44	* ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
	45	* OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
	46	* OR MODIFICATIONS.
	47	*
	48	*/
	49
	50	#ifndef _NET_PPP_COMP_H
	51	#define _NET_PPP_COMP_H
	52
	53	/*
	54	* The following symbols control whether we include code for
	55	* various compression methods.
	56	*/
	57	#ifndef DO_BSD_COMPRESS
	58	#define DO_BSD_COMPRESS 1 /* by default, include BSD-Compress */
	59	#endif
	60	#ifndef DO_DEFLATE
	61	#define DO_DEFLATE 1 /* by default, include Deflate */
	62	#endif
	63	#define DO_PREDICTOR_1 0
	64	#define DO_PREDICTOR_2 0
65
66	/*
67	* Structure giving methods for compression/decompression.
68	*/
69	#if PACKETPTR
70	struct compressor {
71	int compress_proto; /* CCP compression protocol number */
72
73	/* Allocate space for a compressor (transmit side) */
74	void (comp_alloc) __P((u_char *options, int opt_len));
75	/* Free space used by a compressor */
76	void (comp_free) __P((void state));
77	/* Initialize a compressor */
78	int (comp_init) __P((void state, u_char *options, int opt_len,
79	int unit, int hdrlen, int debug));
80	/* Reset a compressor */
81	void (comp_reset) __P((void state));
82	/* Compress a packet */
83	int (compress) __P((void state, PACKETPTR *mret,
84	PACKETPTR mp, int orig_len, int max_len));
85	/* Return compression statistics */
86	void (comp_stat) __P((void state, struct compstat *stats));
87
88	/* Allocate space for a decompressor (receive side) */
89	void (decomp_alloc) __P((u_char *options, int opt_len));
90	/* Free space used by a decompressor */
91	void (decomp_free) __P((void state));
92	/* Initialize a decompressor */
93	int (decomp_init) __P((void state, u_char *options, int opt_len,
94	int unit, int hdrlen, int mru, int debug));
95	/* Reset a decompressor */
96	void (decomp_reset) __P((void state));
97	/* Decompress a packet. */
98	int (decompress) __P((void state, PACKETPTR mp,
99	PACKETPTR *dmpp));
100	/* Update state for an incompressible packet received */
101	void (incomp) __P((void state, PACKETPTR mp));
102	/* Return decompression statistics */
103	void (decomp_stat) __P((void state, struct compstat *stats));
104	};
105	#endif /* PACKETPTR */
106
107	/*
108	* Return values for decompress routine.
109	* We need to make these distinctions so that we can disable certain
110	* useful functionality, namely sending a CCP reset-request as a result
111	* of an error detected after decompression. This is to avoid infringing
112	* a patent held by Motorola.
113	* Don't you just lurve software patents.
114	*/
115	#define DECOMP_OK 0 /* everything went OK */
116	#define DECOMP_ERROR 1 /* error detected before decomp. */
117	#define DECOMP_FATALERROR 2 /* error detected after decomp. */
118
119	/*
120	* CCP codes.
121	*/
122	#define CCP_CONFREQ 1
123	#define CCP_CONFACK 2
124	#define CCP_TERMREQ 5
125	#define CCP_TERMACK 6
126	#define CCP_RESETREQ 14
127	#define CCP_RESETACK 15
128
129	/*
130	* Max # bytes for a CCP option
131	*/
132	#define CCP_MAX_OPTION_LENGTH 32
133
134	/*
135	* Parts of a CCP packet.
136	*/
137	#define CCP_CODE(dp) ((dp)[0])
138	#define CCP_ID(dp) ((dp)[1])
139	#define CCP_LENGTH(dp) (((dp)[2] << 8) + (dp)[3])
140	#define CCP_HDRLEN 4
141
142	#define CCP_OPT_CODE(dp) ((dp)[0])
143	#define CCP_OPT_LENGTH(dp) ((dp)[1])
144	#define CCP_OPT_MINLEN 2
145
146	/*
147	* Definitions for BSD-Compress.
148	*/
149	#define CI_BSD_COMPRESS 21 /* config. option for BSD-Compress */
150	#define CILEN_BSD_COMPRESS 3 /* length of config. option */
151
152	/* Macros for handling the 3rd byte of the BSD-Compress config option. */
153	#define BSD_NBITS(x) ((x) & 0x1F) /* number of bits requested */
154	#define BSD_VERSION(x) ((x) >> 5) /* version of option format */
155	#define BSD_CURRENT_VERSION 1 /* current version number */
156	#define BSD_MAKE_OPT(v, n) (((v) << 5) \| (n))
157
158	#define BSD_MIN_BITS 9 /* smallest code size supported */
159	#define BSD_MAX_BITS 15 /* largest code size supported */
160
161	/*
162	* Definitions for Deflate.
163	*/
164	#define CI_DEFLATE 26 /* config option for Deflate */
165	#define CI_DEFLATE_DRAFT 24 /* value used in original draft RFC */
166	#define CILEN_DEFLATE 4 /* length of its config option */
167
168	#define DEFLATE_MIN_SIZE 8
169	#define DEFLATE_MAX_SIZE 15
170	#define DEFLATE_METHOD_VAL 8
171	#define DEFLATE_SIZE(x) (((x) >> 4) + DEFLATE_MIN_SIZE)
172	#define DEFLATE_METHOD(x) ((x) & 0x0F)
173	#define DEFLATE_MAKE_OPT(w) ((((w) - DEFLATE_MIN_SIZE) << 4) \
174	+ DEFLATE_METHOD_VAL)
175	#define DEFLATE_CHK_SEQUENCE 0
176
177	/*
178	* Definitions for other, as yet unsupported, compression methods.
179	*/
180	#define CI_PREDICTOR_1 1 /* config option for Predictor-1 */
181	#define CILEN_PREDICTOR_1 2 /* length of its config option */
182	#define CI_PREDICTOR_2 2 /* config option for Predictor-2 */
183	#define CILEN_PREDICTOR_2 2 /* length of its config option */
184
185	#endif /* _NET_PPP_COMP_H */