Root/target/linux/generic/files/crypto/ocf/ocfnull/ocfnull.c

1/*
2 * An OCF module for determining the cost of crypto versus the cost of
3 * IPSec processing outside of OCF. This modules gives us the effect of
4 * zero cost encryption, of course you will need to run it at both ends
5 * since it does no crypto at all.
6 *
7 * Written by David McCullough <david_mccullough@mcafee.com>
8 * Copyright (C) 2006-2010 David McCullough
9 *
10 * LICENSE TERMS
11 *
12 * The free distribution and use of this software in both source and binary
13 * form is allowed (with or without changes) provided that:
14 *
15 * 1. distributions of this source code include the above copyright
16 * notice, this list of conditions and the following disclaimer;
17 *
18 * 2. distributions in binary form include the above copyright
19 * notice, this list of conditions and the following disclaimer
20 * in the documentation and/or other associated materials;
21 *
22 * 3. the copyright holder's name is not used to endorse products
23 * built using this software without specific written permission.
24 *
25 * ALTERNATIVELY, provided that this notice is retained in full, this product
26 * may be distributed under the terms of the GNU General Public License (GPL),
27 * in which case the provisions of the GPL apply INSTEAD OF those given above.
28 *
29 * DISCLAIMER
30 *
31 * This software is provided 'as is' with no explicit or implied warranties
32 * in respect of its properties, including, but not limited to, correctness
33 * and/or fitness for purpose.
34 */
35
36#include <linux/version.h>
37#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
38#include <generated/autoconf.h>
39#else
40#include <linux/autoconf.h>
41#endif
42#include <linux/module.h>
43#include <linux/init.h>
44#include <linux/list.h>
45#include <linux/slab.h>
46#include <linux/sched.h>
47#include <linux/wait.h>
48#include <linux/crypto.h>
49#include <linux/interrupt.h>
50
51#include <cryptodev.h>
52#include <uio.h>
53
54static int32_t null_id = -1;
55static u_int32_t null_sesnum = 0;
56
57static int null_process(device_t, struct cryptop *, int);
58static int null_newsession(device_t, u_int32_t *, struct cryptoini *);
59static int null_freesession(device_t, u_int64_t);
60
61#define debug ocfnull_debug
62int ocfnull_debug = 0;
63module_param(ocfnull_debug, int, 0644);
64MODULE_PARM_DESC(ocfnull_debug, "Enable debug");
65
66/*
67 * dummy device structure
68 */
69
70static struct {
71    softc_device_decl sc_dev;
72} nulldev;
73
74static device_method_t null_methods = {
75    /* crypto device methods */
76    DEVMETHOD(cryptodev_newsession, null_newsession),
77    DEVMETHOD(cryptodev_freesession,null_freesession),
78    DEVMETHOD(cryptodev_process, null_process),
79};
80
81/*
82 * Generate a new software session.
83 */
84static int
85null_newsession(device_t arg, u_int32_t *sid, struct cryptoini *cri)
86{
87    dprintk("%s()\n", __FUNCTION__);
88    if (sid == NULL || cri == NULL) {
89        dprintk("%s,%d - EINVAL\n", __FILE__, __LINE__);
90        return EINVAL;
91    }
92
93    if (null_sesnum == 0)
94        null_sesnum++;
95    *sid = null_sesnum++;
96    return 0;
97}
98
99
100/*
101 * Free a session.
102 */
103static int
104null_freesession(device_t arg, u_int64_t tid)
105{
106    u_int32_t sid = CRYPTO_SESID2LID(tid);
107
108    dprintk("%s()\n", __FUNCTION__);
109    if (sid > null_sesnum) {
110        dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
111        return EINVAL;
112    }
113
114    /* Silently accept and return */
115    if (sid == 0)
116        return 0;
117    return 0;
118}
119
120
121/*
122 * Process a request.
123 */
124static int
125null_process(device_t arg, struct cryptop *crp, int hint)
126{
127    unsigned int lid;
128
129    dprintk("%s()\n", __FUNCTION__);
130
131    /* Sanity check */
132    if (crp == NULL) {
133        dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
134        return EINVAL;
135    }
136
137    crp->crp_etype = 0;
138
139    if (crp->crp_desc == NULL || crp->crp_buf == NULL) {
140        dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
141        crp->crp_etype = EINVAL;
142        goto done;
143    }
144
145    /*
146     * find the session we are using
147     */
148
149    lid = crp->crp_sid & 0xffffffff;
150    if (lid >= null_sesnum || lid == 0) {
151        crp->crp_etype = ENOENT;
152        dprintk("%s,%d: ENOENT\n", __FILE__, __LINE__);
153        goto done;
154    }
155
156done:
157    crypto_done(crp);
158    return 0;
159}
160
161
162/*
163 * our driver startup and shutdown routines
164 */
165
166static int
167null_init(void)
168{
169    dprintk("%s(%p)\n", __FUNCTION__, null_init);
170
171    memset(&nulldev, 0, sizeof(nulldev));
172    softc_device_init(&nulldev, "ocfnull", 0, null_methods);
173
174    null_id = crypto_get_driverid(softc_get_device(&nulldev),
175                CRYPTOCAP_F_HARDWARE);
176    if (null_id < 0)
177        panic("ocfnull: crypto device cannot initialize!");
178
179#define REGISTER(alg) \
180    crypto_register(null_id,alg,0,0)
181    REGISTER(CRYPTO_DES_CBC);
182    REGISTER(CRYPTO_3DES_CBC);
183    REGISTER(CRYPTO_RIJNDAEL128_CBC);
184    REGISTER(CRYPTO_MD5);
185    REGISTER(CRYPTO_SHA1);
186    REGISTER(CRYPTO_MD5_HMAC);
187    REGISTER(CRYPTO_SHA1_HMAC);
188#undef REGISTER
189
190    return 0;
191}
192
193static void
194null_exit(void)
195{
196    dprintk("%s()\n", __FUNCTION__);
197    crypto_unregister_all(null_id);
198    null_id = -1;
199}
200
201module_init(null_init);
202module_exit(null_exit);
203
204MODULE_LICENSE("Dual BSD/GPL");
205MODULE_AUTHOR("David McCullough <david_mccullough@mcafee.com>");
206MODULE_DESCRIPTION("ocfnull - claims a lot but does nothing");
207

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