1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/*
* 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) 2002-2008 OpenVPN Technologies, Inc. <sales@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
|
