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1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */2/*3 * ppp-comp.h - Definitions for doing PPP packet compression.4 *5 * Copyright 1994-1998 Paul Mackerras.6 *7 * This program is free software; you can redistribute it and/or8 * modify it under the terms of the GNU General Public License9 * version 2 as published by the Free Software Foundation.10 */11#ifndef _UAPI_NET_PPP_COMP_H12#define _UAPI_NET_PPP_COMP_H13 14 15/*16 * CCP codes.17 */18 19#define CCP_CONFREQ 120#define CCP_CONFACK 221#define CCP_TERMREQ 522#define CCP_TERMACK 623#define CCP_RESETREQ 1424#define CCP_RESETACK 1525 26/*27 * Max # bytes for a CCP option28 */29 30#define CCP_MAX_OPTION_LENGTH 3231 32/*33 * Parts of a CCP packet.34 */35 36#define CCP_CODE(dp) ((dp)[0])37#define CCP_ID(dp) ((dp)[1])38#define CCP_LENGTH(dp) (((dp)[2] << 8) + (dp)[3])39#define CCP_HDRLEN 440 41#define CCP_OPT_CODE(dp) ((dp)[0])42#define CCP_OPT_LENGTH(dp) ((dp)[1])43#define CCP_OPT_MINLEN 244 45/*46 * Definitions for BSD-Compress.47 */48 49#define CI_BSD_COMPRESS 21 /* config. option for BSD-Compress */50#define CILEN_BSD_COMPRESS 3 /* length of config. option */51 52/* Macros for handling the 3rd byte of the BSD-Compress config option. */53#define BSD_NBITS(x) ((x) & 0x1F) /* number of bits requested */54#define BSD_VERSION(x) ((x) >> 5) /* version of option format */55#define BSD_CURRENT_VERSION 1 /* current version number */56#define BSD_MAKE_OPT(v, n) (((v) << 5) | (n))57 58#define BSD_MIN_BITS 9 /* smallest code size supported */59#define BSD_MAX_BITS 15 /* largest code size supported */60 61/*62 * Definitions for Deflate.63 */64 65#define CI_DEFLATE 26 /* config option for Deflate */66#define CI_DEFLATE_DRAFT 24 /* value used in original draft RFC */67#define CILEN_DEFLATE 4 /* length of its config option */68 69#define DEFLATE_MIN_SIZE 970#define DEFLATE_MAX_SIZE 1571#define DEFLATE_METHOD_VAL 872#define DEFLATE_SIZE(x) (((x) >> 4) + 8)73#define DEFLATE_METHOD(x) ((x) & 0x0F)74#define DEFLATE_MAKE_OPT(w) ((((w) - 8) << 4) + DEFLATE_METHOD_VAL)75#define DEFLATE_CHK_SEQUENCE 076 77/*78 * Definitions for MPPE.79 */80 81#define CI_MPPE 18 /* config option for MPPE */82#define CILEN_MPPE 6 /* length of config option */83 84/*85 * Definitions for other, as yet unsupported, compression methods.86 */87 88#define CI_PREDICTOR_1 1 /* config option for Predictor-1 */89#define CILEN_PREDICTOR_1 2 /* length of its config option */90#define CI_PREDICTOR_2 2 /* config option for Predictor-2 */91#define CILEN_PREDICTOR_2 2 /* length of its config option */92 93 94#endif /* _UAPI_NET_PPP_COMP_H */95