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/completion.h>
15#include <linux/ctype.h>
16#include <linux/err.h>
17#include <linux/init.h>
18#include <linux/kthread.h>
19#include <linux/module.h>
20#include <linux/notifier.h>
21#include <linux/rtnetlink.h>
22#include <linux/sched.h>
23#include <linux/slab.h>
24#include <linux/string.h>
25
26#include "internal.h"
27
28struct cryptomgr_param {
29    struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];
30
31    struct {
32        struct rtattr attr;
33        struct crypto_attr_type data;
34    } type;
35
36    union {
37        struct rtattr attr;
38        struct {
39            struct rtattr attr;
40            struct crypto_attr_alg data;
41        } alg;
42        struct {
43            struct rtattr attr;
44            struct crypto_attr_u32 data;
45        } nu32;
46    } attrs[CRYPTO_MAX_ATTRS];
47
48    char template[CRYPTO_MAX_ALG_NAME];
49
50    struct crypto_larval *larval;
51
52    u32 otype;
53    u32 omask;
54};
55
56struct crypto_test_param {
57    char driver[CRYPTO_MAX_ALG_NAME];
58    char alg[CRYPTO_MAX_ALG_NAME];
59    u32 type;
60};
61
62static int cryptomgr_probe(void *data)
63{
64    struct cryptomgr_param *param = data;
65    struct crypto_template *tmpl;
66    struct crypto_instance *inst;
67    int err;
68
69    tmpl = crypto_lookup_template(param->template);
70    if (!tmpl)
71        goto out;
72
73    do {
74        if (tmpl->create) {
75            err = tmpl->create(tmpl, param->tb);
76            continue;
77        }
78
79        inst = tmpl->alloc(param->tb);
80        if (IS_ERR(inst))
81            err = PTR_ERR(inst);
82        else if ((err = crypto_register_instance(tmpl, inst)))
83            tmpl->free(inst);
84    } while (err == -EAGAIN && !signal_pending(current));
85
86    crypto_tmpl_put(tmpl);
87
88out:
89    complete_all(&param->larval->completion);
90    crypto_alg_put(&param->larval->alg);
91    kfree(param);
92    module_put_and_exit(0);
93}
94
95static int cryptomgr_schedule_probe(struct crypto_larval *larval)
96{
97    struct task_struct *thread;
98    struct cryptomgr_param *param;
99    const char *name = larval->alg.cra_name;
100    const char *p;
101    unsigned int len;
102    int i;
103
104    if (!try_module_get(THIS_MODULE))
105        goto err;
106
107    param = kzalloc(sizeof(*param), GFP_KERNEL);
108    if (!param)
109        goto err_put_module;
110
111    for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
112        ;
113
114    len = p - name;
115    if (!len || *p != '(')
116        goto err_free_param;
117
118    memcpy(param->template, name, len);
119
120    i = 0;
121    for (;;) {
122        int notnum = 0;
123
124        name = ++p;
125        len = 0;
126
127        for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
128            notnum |= !isdigit(*p);
129
130        if (*p == '(') {
131            int recursion = 0;
132
133            for (;;) {
134                if (!*++p)
135                    goto err_free_param;
136                if (*p == '(')
137                    recursion++;
138                else if (*p == ')' && !recursion--)
139                    break;
140            }
141
142            notnum = 1;
143            p++;
144        }
145
146        len = p - name;
147        if (!len)
148            goto err_free_param;
149
150        if (notnum) {
151            param->attrs[i].alg.attr.rta_len =
152                sizeof(param->attrs[i].alg);
153            param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
154            memcpy(param->attrs[i].alg.data.name, name, len);
155        } else {
156            param->attrs[i].nu32.attr.rta_len =
157                sizeof(param->attrs[i].nu32);
158            param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
159            param->attrs[i].nu32.data.num =
160                simple_strtol(name, NULL, 0);
161        }
162
163        param->tb[i + 1] = &param->attrs[i].attr;
164        i++;
165
166        if (i >= CRYPTO_MAX_ATTRS)
167            goto err_free_param;
168
169        if (*p == ')')
170            break;
171
172        if (*p != ',')
173            goto err_free_param;
174    }
175
176    if (!i)
177        goto err_free_param;
178
179    param->tb[i + 1] = NULL;
180
181    param->type.attr.rta_len = sizeof(param->type);
182    param->type.attr.rta_type = CRYPTOA_TYPE;
183    param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
184    param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
185    param->tb[0] = &param->type.attr;
186
187    param->otype = larval->alg.cra_flags;
188    param->omask = larval->mask;
189
190    crypto_alg_get(&larval->alg);
191    param->larval = larval;
192
193    thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
194    if (IS_ERR(thread))
195        goto err_put_larval;
196
197    wait_for_completion_interruptible(&larval->completion);
198
199    return NOTIFY_STOP;
200
201err_put_larval:
202    crypto_alg_put(&larval->alg);
203err_free_param:
204    kfree(param);
205err_put_module:
206    module_put(THIS_MODULE);
207err:
208    return NOTIFY_OK;
209}
210
211static int cryptomgr_test(void *data)
212{
213    struct crypto_test_param *param = data;
214    u32 type = param->type;
215    int err = 0;
216
217#ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
218    goto skiptest;
219#endif
220
221    if (type & CRYPTO_ALG_TESTED)
222        goto skiptest;
223
224    err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
225
226skiptest:
227    crypto_alg_tested(param->driver, err);
228
229    kfree(param);
230    module_put_and_exit(0);
231}
232
233static int cryptomgr_schedule_test(struct crypto_alg *alg)
234{
235    struct task_struct *thread;
236    struct crypto_test_param *param;
237    u32 type;
238
239    if (!try_module_get(THIS_MODULE))
240        goto err;
241
242    param = kzalloc(sizeof(*param), GFP_KERNEL);
243    if (!param)
244        goto err_put_module;
245
246    memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
247    memcpy(param->alg, alg->cra_name, sizeof(param->alg));
248    type = alg->cra_flags;
249
250    /* This piece of crap needs to disappear into per-type test hooks. */
251    if ((!((type ^ CRYPTO_ALG_TYPE_BLKCIPHER) &
252           CRYPTO_ALG_TYPE_BLKCIPHER_MASK) && !(type & CRYPTO_ALG_GENIV) &&
253         ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
254          CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
255                      alg->cra_ablkcipher.ivsize)) ||
256        (!((type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) &&
257         alg->cra_type == &crypto_nivaead_type && alg->cra_aead.ivsize))
258        type |= CRYPTO_ALG_TESTED;
259
260    param->type = type;
261
262    thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
263    if (IS_ERR(thread))
264        goto err_free_param;
265
266    return NOTIFY_STOP;
267
268err_free_param:
269    kfree(param);
270err_put_module:
271    module_put(THIS_MODULE);
272err:
273    return NOTIFY_OK;
274}
275
276static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
277                void *data)
278{
279    switch (msg) {
280    case CRYPTO_MSG_ALG_REQUEST:
281        return cryptomgr_schedule_probe(data);
282    case CRYPTO_MSG_ALG_REGISTER:
283        return cryptomgr_schedule_test(data);
284    }
285
286    return NOTIFY_DONE;
287}
288
289static struct notifier_block cryptomgr_notifier = {
290    .notifier_call = cryptomgr_notify,
291};
292
293static int __init cryptomgr_init(void)
294{
295    return crypto_register_notifier(&cryptomgr_notifier);
296}
297
298static void __exit cryptomgr_exit(void)
299{
300    int err = crypto_unregister_notifier(&cryptomgr_notifier);
301    BUG_ON(err);
302}
303
304subsys_initcall(cryptomgr_init);
305module_exit(cryptomgr_exit);
306
307MODULE_LICENSE("GPL");
308MODULE_DESCRIPTION("Crypto Algorithm Manager");
309

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