95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
/* 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 */
|