mirror of
https://github.com/OpenVPN/openvpn.git
synced 2024-09-20 03:52:28 +02:00
537073fd55
git-svn-id: http://svn.openvpn.net/projects/openvpn/branches/BETA21/openvpn@588 e7ae566f-a301-0410-adde-c780ea21d3b5
137 lines
3.8 KiB
C
137 lines
3.8 KiB
C
/*
|
|
* OpenVPN -- An application to securely tunnel IP networks
|
|
* over a single UDP port, with support for SSL/TLS-based
|
|
* session authentication and key exchange,
|
|
* packet encryption, packet authentication, and
|
|
* packet compression.
|
|
*
|
|
* Copyright (C) 2002-2005 OpenVPN Solutions LLC <info@openvpn.net>
|
|
*
|
|
* 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.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program (see the file COPYING included with this
|
|
* distribution); if not, write to the Free Software Foundation, Inc.,
|
|
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#ifndef OPENVPN_LZO_H
|
|
#define OPENVPN_LZO_H
|
|
|
|
#ifdef USE_LZO
|
|
|
|
#ifdef LZO_HEADER_DIR
|
|
#include "lzo/lzoutil.h"
|
|
#include "lzo/lzo1x.h"
|
|
#else
|
|
#include "lzoutil.h"
|
|
#include "lzo1x.h"
|
|
#endif
|
|
|
|
#include "buffer.h"
|
|
#include "mtu.h"
|
|
#include "common.h"
|
|
#include "status.h"
|
|
|
|
/* LZO flags */
|
|
#define LZO_SELECTED (1<<0)
|
|
#define LZO_ON (1<<1)
|
|
#define LZO_ADAPTIVE (1<<2)
|
|
|
|
/*
|
|
* Use LZO compress routine lzo1x_1_15_compress which is described
|
|
* as faster but needs a bit more memory than the standard routine.
|
|
* Use safe decompress (i.e. check for buffer overflows).
|
|
* You may want to use the non-safe version
|
|
* of decompress if speed is essential and if you know
|
|
* that you will always be using a MAC to verify the
|
|
* integrity of incoming packets.
|
|
*/
|
|
#define LZO_COMPRESS lzo1x_1_15_compress
|
|
#define LZO_WORKSPACE LZO1X_1_15_MEM_COMPRESS
|
|
#define LZO_DECOMPRESS lzo1x_decompress_safe
|
|
|
|
#define LZO_EXTRA_BUFFER(len) ((len)/8 + 128 + 3) /* LZO 2.0 worst case size expansion. */
|
|
|
|
/*
|
|
* Don't try to compress any packet smaller than this.
|
|
*/
|
|
#define COMPRESS_THRESHOLD 100
|
|
|
|
/*
|
|
* Length of prepended prefix on LZO packets
|
|
*/
|
|
#define LZO_PREFIX_LEN 1
|
|
|
|
/*
|
|
* Adaptive compress parameters
|
|
*/
|
|
#define AC_SAMP_SEC 2 /* number of seconds in sample period */
|
|
#define AC_MIN_BYTES 1000 /* sample period must have at least n bytes
|
|
to be valid for testing */
|
|
#define AC_SAVE_PCT 5 /* turn off compress if we didn't save at
|
|
least this % during sample period */
|
|
#define AC_OFF_SEC 60 /* if we turn off compression, don't do sample
|
|
retest for n seconds */
|
|
|
|
struct lzo_adaptive_compress {
|
|
bool compress_state;
|
|
time_t next;
|
|
int n_total;
|
|
int n_comp;
|
|
};
|
|
|
|
/*
|
|
* Compress and Uncompress routines.
|
|
*/
|
|
|
|
struct lzo_compress_workspace
|
|
{
|
|
lzo_voidp wmem;
|
|
int wmem_size;
|
|
struct lzo_adaptive_compress ac;
|
|
unsigned int flags;
|
|
bool defined;
|
|
|
|
/* statistics */
|
|
counter_type pre_decompress;
|
|
counter_type post_decompress;
|
|
counter_type pre_compress;
|
|
counter_type post_compress;
|
|
};
|
|
|
|
void lzo_adjust_frame_parameters(struct frame *frame);
|
|
|
|
void lzo_compress_init (struct lzo_compress_workspace *lzowork, unsigned int flags);
|
|
|
|
void lzo_compress_uninit (struct lzo_compress_workspace *lzowork);
|
|
|
|
void lzo_modify_flags (struct lzo_compress_workspace *lzowork, unsigned int flags);
|
|
|
|
void lzo_compress (struct buffer *buf, struct buffer work,
|
|
struct lzo_compress_workspace *lzowork,
|
|
const struct frame* frame);
|
|
|
|
void lzo_decompress (struct buffer *buf, struct buffer work,
|
|
struct lzo_compress_workspace *lzowork,
|
|
const struct frame* frame);
|
|
|
|
void lzo_print_stats (const struct lzo_compress_workspace *lzo_compwork, struct status_output *so);
|
|
|
|
static inline bool
|
|
lzo_defined (const struct lzo_compress_workspace *lzowork)
|
|
{
|
|
return lzowork->defined;
|
|
}
|
|
|
|
|
|
#endif /* USE_LZO */
|
|
#endif
|