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

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