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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/*
* An OCF module for determining the cost of crypto versus the cost of
* IPSec processing outside of OCF. This modules gives us the effect of
* zero cost encryption, of course you will need to run it at both ends
* since it does no crypto at all.
*
* Written by David McCullough <david_mccullough@mcafee.com>
* Copyright (C) 2006-2010 David McCullough
*
* LICENSE TERMS
*
* The free distribution and use of this software in both source and binary
* form is allowed (with or without changes) provided that:
*
* 1. distributions of this source code include the above copyright
* notice, this list of conditions and the following disclaimer;
*
* 2. distributions in binary form include the above copyright
* notice, this list of conditions and the following disclaimer
* in the documentation and/or other associated materials;
*
* 3. the copyright holder's name is not used to endorse products
* built using this software without specific written permission.
*
* ALTERNATIVELY, provided that this notice is retained in full, this product
* may be distributed under the terms of the GNU General Public License (GPL),
* in which case the provisions of the GPL apply INSTEAD OF those given above.
*
* DISCLAIMER
*
* This software is provided 'as is' with no explicit or implied warranties
* in respect of its properties, including, but not limited to, correctness
* and/or fitness for purpose.
*/
#include <linux/version.h>
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) && !defined(AUTOCONF_INCLUDED)
#include <linux/config.h>
#endif
#include <linux/module.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/crypto.h>
#include <linux/interrupt.h>
#include <cryptodev.h>
#include <uio.h>
static int32_t null_id = -1;
static u_int32_t null_sesnum = 0;
static int null_process(device_t, struct cryptop *, int);
static int null_newsession(device_t, u_int32_t *, struct cryptoini *);
static int null_freesession(device_t, u_int64_t);
#define debug ocfnull_debug
int ocfnull_debug = 0;
module_param(ocfnull_debug, int, 0644);
MODULE_PARM_DESC(ocfnull_debug, "Enable debug");
/*
* dummy device structure
*/
static struct {
softc_device_decl sc_dev;
} nulldev;
static device_method_t null_methods = {
/* crypto device methods */
DEVMETHOD(cryptodev_newsession, null_newsession),
DEVMETHOD(cryptodev_freesession,null_freesession),
DEVMETHOD(cryptodev_process, null_process),
};
/*
* Generate a new software session.
*/
static int
null_newsession(device_t arg, u_int32_t *sid, struct cryptoini *cri)
{
dprintk("%s()\n", __FUNCTION__);
if (sid == NULL || cri == NULL) {
dprintk("%s,%d - EINVAL\n", __FILE__, __LINE__);
return EINVAL;
}
if (null_sesnum == 0)
null_sesnum++;
*sid = null_sesnum++;
return 0;
}
/*
* Free a session.
*/
static int
null_freesession(device_t arg, u_int64_t tid)
{
u_int32_t sid = CRYPTO_SESID2LID(tid);
dprintk("%s()\n", __FUNCTION__);
if (sid > null_sesnum) {
dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
return EINVAL;
}
/* Silently accept and return */
if (sid == 0)
return 0;
return 0;
}
/*
* Process a request.
*/
static int
null_process(device_t arg, struct cryptop *crp, int hint)
{
unsigned int lid;
dprintk("%s()\n", __FUNCTION__);
/* Sanity check */
if (crp == NULL) {
dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
return EINVAL;
}
crp->crp_etype = 0;
if (crp->crp_desc == NULL || crp->crp_buf == NULL) {
dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
crp->crp_etype = EINVAL;
goto done;
}
/*
* find the session we are using
*/
lid = crp->crp_sid & 0xffffffff;
if (lid >= null_sesnum || lid == 0) {
crp->crp_etype = ENOENT;
dprintk("%s,%d: ENOENT\n", __FILE__, __LINE__);
goto done;
}
done:
crypto_done(crp);
return 0;
}
/*
* our driver startup and shutdown routines
*/
static int
null_init(void)
{
dprintk("%s(%p)\n", __FUNCTION__, null_init);
memset(&nulldev, 0, sizeof(nulldev));
softc_device_init(&nulldev, "ocfnull", 0, null_methods);
null_id = crypto_get_driverid(softc_get_device(&nulldev),
CRYPTOCAP_F_HARDWARE);
if (null_id < 0)
panic("ocfnull: crypto device cannot initialize!");
#define REGISTER(alg) \
crypto_register(null_id,alg,0,0)
REGISTER(CRYPTO_DES_CBC);
REGISTER(CRYPTO_3DES_CBC);
REGISTER(CRYPTO_RIJNDAEL128_CBC);
REGISTER(CRYPTO_MD5);
REGISTER(CRYPTO_SHA1);
REGISTER(CRYPTO_MD5_HMAC);
REGISTER(CRYPTO_SHA1_HMAC);
#undef REGISTER
return 0;
}
static void
null_exit(void)
{
dprintk("%s()\n", __FUNCTION__);
crypto_unregister_all(null_id);
null_id = -1;
}
module_init(null_init);
module_exit(null_exit);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("David McCullough <david_mccullough@mcafee.com>");
MODULE_DESCRIPTION("ocfnull - claims a lot but does nothing");
|
