| /* 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 */ |
