cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ppp-comp.h (3023B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * ppp-comp.h - Definitions for doing PPP packet compression.
      4 *
      5 * Copyright 1994-1998 Paul Mackerras.
      6 */
      7#ifndef _NET_PPP_COMP_H
      8#define _NET_PPP_COMP_H
      9
     10#include <uapi/linux/ppp-comp.h>
     11
     12
     13struct module;
     14
     15/*
     16 * The following symbols control whether we include code for
     17 * various compression methods.
     18 */
     19
     20#ifndef DO_BSD_COMPRESS
     21#define DO_BSD_COMPRESS	1	/* by default, include BSD-Compress */
     22#endif
     23#ifndef DO_DEFLATE
     24#define DO_DEFLATE	1	/* by default, include Deflate */
     25#endif
     26#define DO_PREDICTOR_1	0
     27#define DO_PREDICTOR_2	0
     28
     29/*
     30 * Structure giving methods for compression/decompression.
     31 */
     32
     33struct compressor {
     34	int	compress_proto;	/* CCP compression protocol number */
     35
     36	/* Allocate space for a compressor (transmit side) */
     37	void	*(*comp_alloc) (unsigned char *options, int opt_len);
     38
     39	/* Free space used by a compressor */
     40	void	(*comp_free) (void *state);
     41
     42	/* Initialize a compressor */
     43	int	(*comp_init) (void *state, unsigned char *options,
     44			      int opt_len, int unit, int opthdr, int debug);
     45
     46	/* Reset a compressor */
     47	void	(*comp_reset) (void *state);
     48
     49	/* Compress a packet */
     50	int     (*compress) (void *state, unsigned char *rptr,
     51			      unsigned char *obuf, int isize, int osize);
     52
     53	/* Return compression statistics */
     54	void	(*comp_stat) (void *state, struct compstat *stats);
     55
     56	/* Allocate space for a decompressor (receive side) */
     57	void	*(*decomp_alloc) (unsigned char *options, int opt_len);
     58
     59	/* Free space used by a decompressor */
     60	void	(*decomp_free) (void *state);
     61
     62	/* Initialize a decompressor */
     63	int	(*decomp_init) (void *state, unsigned char *options,
     64				int opt_len, int unit, int opthdr, int mru,
     65				int debug);
     66
     67	/* Reset a decompressor */
     68	void	(*decomp_reset) (void *state);
     69
     70	/* Decompress a packet. */
     71	int	(*decompress) (void *state, unsigned char *ibuf, int isize,
     72				unsigned char *obuf, int osize);
     73
     74	/* Update state for an incompressible packet received */
     75	void	(*incomp) (void *state, unsigned char *ibuf, int icnt);
     76
     77	/* Return decompression statistics */
     78	void	(*decomp_stat) (void *state, struct compstat *stats);
     79
     80	/* Used in locking compressor modules */
     81	struct module *owner;
     82	/* Extra skb space needed by the compressor algorithm */
     83	unsigned int comp_extra;
     84};
     85
     86/*
     87 * The return value from decompress routine is the length of the
     88 * decompressed packet if successful, otherwise DECOMP_ERROR
     89 * or DECOMP_FATALERROR if an error occurred.
     90 * 
     91 * We need to make this distinction so that we can disable certain
     92 * useful functionality, namely sending a CCP reset-request as a result
     93 * of an error detected after decompression.  This is to avoid infringing
     94 * a patent held by Motorola.
     95 * Don't you just lurve software patents.
     96 */
     97
     98#define DECOMP_ERROR		-1	/* error detected before decomp. */
     99#define DECOMP_FATALERROR	-2	/* error detected after decomp. */
    100
    101extern int ppp_register_compressor(struct compressor *);
    102extern void ppp_unregister_compressor(struct compressor *);
    103#endif /* _NET_PPP_COMP_H */