Root/crypto/algboss.c

1/*
2 * Create default crypto algorithm instances.
3 *
4 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13#include <crypto/internal/aead.h>
14#include <linux/ctype.h>
15#include <linux/err.h>
16#include <linux/init.h>
17#include <linux/kthread.h>
18#include <linux/module.h>
19#include <linux/notifier.h>
20#include <linux/rtnetlink.h>
21#include <linux/sched.h>
22#include <linux/slab.h>
23#include <linux/string.h>
24
25#include "internal.h"
26
27struct cryptomgr_param {
28    struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];
29
30    struct {
31        struct rtattr attr;
32        struct crypto_attr_type data;
33    } type;
34
35    union {
36        struct rtattr attr;
37        struct {
38            struct rtattr attr;
39            struct crypto_attr_alg data;
40        } alg;
41        struct {
42            struct rtattr attr;
43            struct crypto_attr_u32 data;
44        } nu32;
45    } attrs[CRYPTO_MAX_ATTRS];
46
47    char larval[CRYPTO_MAX_ALG_NAME];
48    char template[CRYPTO_MAX_ALG_NAME];
49
50    u32 otype;
51    u32 omask;
52};
53
54struct crypto_test_param {
55    char driver[CRYPTO_MAX_ALG_NAME];
56    char alg[CRYPTO_MAX_ALG_NAME];
57    u32 type;
58};
59
60static int cryptomgr_probe(void *data)
61{
62    struct cryptomgr_param *param = data;
63    struct crypto_template *tmpl;
64    struct crypto_instance *inst;
65    int err;
66
67    tmpl = crypto_lookup_template(param->template);
68    if (!tmpl)
69        goto err;
70
71    do {
72        if (tmpl->create) {
73            err = tmpl->create(tmpl, param->tb);
74            continue;
75        }
76
77        inst = tmpl->alloc(param->tb);
78        if (IS_ERR(inst))
79            err = PTR_ERR(inst);
80        else if ((err = crypto_register_instance(tmpl, inst)))
81            tmpl->free(inst);
82    } while (err == -EAGAIN && !signal_pending(current));
83
84    crypto_tmpl_put(tmpl);
85
86    if (err)
87        goto err;
88
89out:
90    kfree(param);
91    module_put_and_exit(0);
92
93err:
94    crypto_larval_error(param->larval, param->otype, param->omask);
95    goto out;
96}
97
98static int cryptomgr_schedule_probe(struct crypto_larval *larval)
99{
100    struct task_struct *thread;
101    struct cryptomgr_param *param;
102    const char *name = larval->alg.cra_name;
103    const char *p;
104    unsigned int len;
105    int i;
106
107    if (!try_module_get(THIS_MODULE))
108        goto err;
109
110    param = kzalloc(sizeof(*param), GFP_KERNEL);
111    if (!param)
112        goto err_put_module;
113
114    for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
115        ;
116
117    len = p - name;
118    if (!len || *p != '(')
119        goto err_free_param;
120
121    memcpy(param->template, name, len);
122
123    i = 0;
124    for (;;) {
125        int notnum = 0;
126
127        name = ++p;
128        len = 0;
129
130        for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
131            notnum |= !isdigit(*p);
132
133        if (*p == '(') {
134            int recursion = 0;
135
136            for (;;) {
137                if (!*++p)
138                    goto err_free_param;
139                if (*p == '(')
140                    recursion++;
141                else if (*p == ')' && !recursion--)
142                    break;
143            }
144
145            notnum = 1;
146            p++;
147        }
148
149        len = p - name;
150        if (!len)
151            goto err_free_param;
152
153        if (notnum) {
154            param->attrs[i].alg.attr.rta_len =
155                sizeof(param->attrs[i].alg);
156            param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
157            memcpy(param->attrs[i].alg.data.name, name, len);
158        } else {
159            param->attrs[i].nu32.attr.rta_len =
160                sizeof(param->attrs[i].nu32);
161            param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
162            param->attrs[i].nu32.data.num =
163                simple_strtol(name, NULL, 0);
164        }
165
166        param->tb[i + 1] = &param->attrs[i].attr;
167        i++;
168
169        if (i >= CRYPTO_MAX_ATTRS)
170            goto err_free_param;
171
172        if (*p == ')')
173            break;
174
175        if (*p != ',')
176            goto err_free_param;
177    }
178
179    if (!i)
180        goto err_free_param;
181
182    param->tb[i + 1] = NULL;
183
184    param->type.attr.rta_len = sizeof(param->type);
185    param->type.attr.rta_type = CRYPTOA_TYPE;
186    param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
187    param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
188    param->tb[0] = &param->type.attr;
189
190    param->otype = larval->alg.cra_flags;
191    param->omask = larval->mask;
192
193    memcpy(param->larval, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
194
195    thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
196    if (IS_ERR(thread))
197        goto err_free_param;
198
199    return NOTIFY_STOP;
200
201err_free_param:
202    kfree(param);
203err_put_module:
204    module_put(THIS_MODULE);
205err:
206    return NOTIFY_OK;
207}
208
209static int cryptomgr_test(void *data)
210{
211    struct crypto_test_param *param = data;
212    u32 type = param->type;
213    int err = 0;
214
215#ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
216    goto skiptest;
217#endif
218
219    if (type & CRYPTO_ALG_TESTED)
220        goto skiptest;
221
222    err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
223
224skiptest:
225    crypto_alg_tested(param->driver, err);
226
227    kfree(param);
228    module_put_and_exit(0);
229}
230
231static int cryptomgr_schedule_test(struct crypto_alg *alg)
232{
233    struct task_struct *thread;
234    struct crypto_test_param *param;
235    u32 type;
236
237    if (!try_module_get(THIS_MODULE))
238        goto err;
239
240    param = kzalloc(sizeof(*param), GFP_KERNEL);
241    if (!param)
242        goto err_put_module;
243
244    memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
245    memcpy(param->alg, alg->cra_name, sizeof(param->alg));
246    type = alg->cra_flags;
247
248    /* This piece of crap needs to disappear into per-type test hooks. */
249    if ((!((type ^ CRYPTO_ALG_TYPE_BLKCIPHER) &
250           CRYPTO_ALG_TYPE_BLKCIPHER_MASK) && !(type & CRYPTO_ALG_GENIV) &&
251         ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
252          CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
253                      alg->cra_ablkcipher.ivsize)) ||
254        (!((type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) &&
255         alg->cra_type == &crypto_nivaead_type && alg->cra_aead.ivsize))
256        type |= CRYPTO_ALG_TESTED;
257
258    param->type = type;
259
260    thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
261    if (IS_ERR(thread))
262        goto err_free_param;
263
264    return NOTIFY_STOP;
265
266err_free_param:
267    kfree(param);
268err_put_module:
269    module_put(THIS_MODULE);
270err:
271    return NOTIFY_OK;
272}
273
274static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
275                void *data)
276{
277    switch (msg) {
278    case CRYPTO_MSG_ALG_REQUEST:
279        return cryptomgr_schedule_probe(data);
280    case CRYPTO_MSG_ALG_REGISTER:
281        return cryptomgr_schedule_test(data);
282    }
283
284    return NOTIFY_DONE;
285}
286
287static struct notifier_block cryptomgr_notifier = {
288    .notifier_call = cryptomgr_notify,
289};
290
291static int __init cryptomgr_init(void)
292{
293    return crypto_register_notifier(&cryptomgr_notifier);
294}
295
296static void __exit cryptomgr_exit(void)
297{
298    int err = crypto_unregister_notifier(&cryptomgr_notifier);
299    BUG_ON(err);
300}
301
302subsys_initcall(cryptomgr_init);
303module_exit(cryptomgr_exit);
304
305MODULE_LICENSE("GPL");
306MODULE_DESCRIPTION("Crypto Algorithm Manager");
307

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