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1/*
2 * Scatterlist Cryptographic API.
3 *
4 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
5 * Copyright (c) 2002 David S. Miller (davem@redhat.com)
6 * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
7 *
8 * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
9 * and Nettle, by Niels Möller.
10 *
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the Free
13 * Software Foundation; either version 2 of the License, or (at your option)
14 * any later version.
15 *
16 */
17
18#include <linux/err.h>
19#include <linux/errno.h>
20#include <linux/kernel.h>
21#include <linux/kmod.h>
22#include <linux/module.h>
23#include <linux/param.h>
24#include <linux/sched.h>
25#include <linux/slab.h>
26#include <linux/string.h>
27#include "internal.h"
28
29LIST_HEAD(crypto_alg_list);
30EXPORT_SYMBOL_GPL(crypto_alg_list);
31DECLARE_RWSEM(crypto_alg_sem);
32EXPORT_SYMBOL_GPL(crypto_alg_sem);
33
34BLOCKING_NOTIFIER_HEAD(crypto_chain);
35EXPORT_SYMBOL_GPL(crypto_chain);
36
37static inline struct crypto_alg *crypto_alg_get(struct crypto_alg *alg)
38{
39 atomic_inc(&alg->cra_refcnt);
40 return alg;
41}
42
43struct crypto_alg *crypto_mod_get(struct crypto_alg *alg)
44{
45 return try_module_get(alg->cra_module) ? crypto_alg_get(alg) : NULL;
46}
47EXPORT_SYMBOL_GPL(crypto_mod_get);
48
49void crypto_mod_put(struct crypto_alg *alg)
50{
51 struct module *module = alg->cra_module;
52
53 crypto_alg_put(alg);
54 module_put(module);
55}
56EXPORT_SYMBOL_GPL(crypto_mod_put);
57
58static inline int crypto_is_test_larval(struct crypto_larval *larval)
59{
60 return larval->alg.cra_driver_name[0];
61}
62
63static struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type,
64 u32 mask)
65{
66 struct crypto_alg *q, *alg = NULL;
67 int best = -2;
68
69 list_for_each_entry(q, &crypto_alg_list, cra_list) {
70 int exact, fuzzy;
71
72 if (crypto_is_moribund(q))
73 continue;
74
75 if ((q->cra_flags ^ type) & mask)
76 continue;
77
78 if (crypto_is_larval(q) &&
79 !crypto_is_test_larval((struct crypto_larval *)q) &&
80 ((struct crypto_larval *)q)->mask != mask)
81 continue;
82
83 exact = !strcmp(q->cra_driver_name, name);
84 fuzzy = !strcmp(q->cra_name, name);
85 if (!exact && !(fuzzy && q->cra_priority > best))
86 continue;
87
88 if (unlikely(!crypto_mod_get(q)))
89 continue;
90
91 best = q->cra_priority;
92 if (alg)
93 crypto_mod_put(alg);
94 alg = q;
95
96 if (exact)
97 break;
98 }
99
100 return alg;
101}
102
103static void crypto_larval_destroy(struct crypto_alg *alg)
104{
105 struct crypto_larval *larval = (void *)alg;
106
107 BUG_ON(!crypto_is_larval(alg));
108 if (larval->adult)
109 crypto_mod_put(larval->adult);
110 kfree(larval);
111}
112
113struct crypto_larval *crypto_larval_alloc(const char *name, u32 type, u32 mask)
114{
115 struct crypto_larval *larval;
116
117 larval = kzalloc(sizeof(*larval), GFP_KERNEL);
118 if (!larval)
119 return ERR_PTR(-ENOMEM);
120
121 larval->mask = mask;
122 larval->alg.cra_flags = CRYPTO_ALG_LARVAL | type;
123 larval->alg.cra_priority = -1;
124 larval->alg.cra_destroy = crypto_larval_destroy;
125
126 strlcpy(larval->alg.cra_name, name, CRYPTO_MAX_ALG_NAME);
127 init_completion(&larval->completion);
128
129 return larval;
130}
131EXPORT_SYMBOL_GPL(crypto_larval_alloc);
132
133static struct crypto_alg *crypto_larval_add(const char *name, u32 type,
134 u32 mask)
135{
136 struct crypto_alg *alg;
137 struct crypto_larval *larval;
138
139 larval = crypto_larval_alloc(name, type, mask);
140 if (IS_ERR(larval))
141 return ERR_CAST(larval);
142
143 atomic_set(&larval->alg.cra_refcnt, 2);
144
145 down_write(&crypto_alg_sem);
146 alg = __crypto_alg_lookup(name, type, mask);
147 if (!alg) {
148 alg = &larval->alg;
149 list_add(&alg->cra_list, &crypto_alg_list);
150 }
151 up_write(&crypto_alg_sem);
152
153 if (alg != &larval->alg)
154 kfree(larval);
155
156 return alg;
157}
158
159void crypto_larval_kill(struct crypto_alg *alg)
160{
161 struct crypto_larval *larval = (void *)alg;
162
163 down_write(&crypto_alg_sem);
164 list_del(&alg->cra_list);
165 up_write(&crypto_alg_sem);
166 complete_all(&larval->completion);
167 crypto_alg_put(alg);
168}
169EXPORT_SYMBOL_GPL(crypto_larval_kill);
170
171static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg)
172{
173 struct crypto_larval *larval = (void *)alg;
174 long timeout;
175
176 timeout = wait_for_completion_interruptible_timeout(
177 &larval->completion, 60 * HZ);
178
179 alg = larval->adult;
180 if (timeout < 0)
181 alg = ERR_PTR(-EINTR);
182 else if (!timeout)
183 alg = ERR_PTR(-ETIMEDOUT);
184 else if (!alg)
185 alg = ERR_PTR(-ENOENT);
186 else if (crypto_is_test_larval(larval) &&
187 !(alg->cra_flags & CRYPTO_ALG_TESTED))
188 alg = ERR_PTR(-EAGAIN);
189 else if (!crypto_mod_get(alg))
190 alg = ERR_PTR(-EAGAIN);
191 crypto_mod_put(&larval->alg);
192
193 return alg;
194}
195
196struct crypto_alg *crypto_alg_lookup(const char *name, u32 type, u32 mask)
197{
198 struct crypto_alg *alg;
199
200 down_read(&crypto_alg_sem);
201 alg = __crypto_alg_lookup(name, type, mask);
202 up_read(&crypto_alg_sem);
203
204 return alg;
205}
206EXPORT_SYMBOL_GPL(crypto_alg_lookup);
207
208struct crypto_alg *crypto_larval_lookup(const char *name, u32 type, u32 mask)
209{
210 struct crypto_alg *alg;
211
212 if (!name)
213 return ERR_PTR(-ENOENT);
214
215 mask &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD);
216 type &= mask;
217
218 alg = crypto_alg_lookup(name, type, mask);
219 if (!alg) {
220 request_module("%s", name);
221
222 if (!((type ^ CRYPTO_ALG_NEED_FALLBACK) & mask &
223 CRYPTO_ALG_NEED_FALLBACK))
224 request_module("%s-all", name);
225
226 alg = crypto_alg_lookup(name, type, mask);
227 }
228
229 if (alg)
230 return crypto_is_larval(alg) ? crypto_larval_wait(alg) : alg;
231
232 return crypto_larval_add(name, type, mask);
233}
234EXPORT_SYMBOL_GPL(crypto_larval_lookup);
235
236int crypto_probing_notify(unsigned long val, void *v)
237{
238 int ok;
239
240 ok = blocking_notifier_call_chain(&crypto_chain, val, v);
241 if (ok == NOTIFY_DONE) {
242 request_module("cryptomgr");
243 ok = blocking_notifier_call_chain(&crypto_chain, val, v);
244 }
245
246 return ok;
247}
248EXPORT_SYMBOL_GPL(crypto_probing_notify);
249
250struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask)
251{
252 struct crypto_alg *alg;
253 struct crypto_alg *larval;
254 int ok;
255
256 if (!((type | mask) & CRYPTO_ALG_TESTED)) {
257 type |= CRYPTO_ALG_TESTED;
258 mask |= CRYPTO_ALG_TESTED;
259 }
260
261 larval = crypto_larval_lookup(name, type, mask);
262 if (IS_ERR(larval) || !crypto_is_larval(larval))
263 return larval;
264
265 ok = crypto_probing_notify(CRYPTO_MSG_ALG_REQUEST, larval);
266
267 if (ok == NOTIFY_STOP)
268 alg = crypto_larval_wait(larval);
269 else {
270 crypto_mod_put(larval);
271 alg = ERR_PTR(-ENOENT);
272 }
273 crypto_larval_kill(larval);
274 return alg;
275}
276EXPORT_SYMBOL_GPL(crypto_alg_mod_lookup);
277
278static int crypto_init_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
279{
280 const struct crypto_type *type_obj = tfm->__crt_alg->cra_type;
281
282 if (type_obj)
283 return type_obj->init(tfm, type, mask);
284
285 switch (crypto_tfm_alg_type(tfm)) {
286 case CRYPTO_ALG_TYPE_CIPHER:
287 return crypto_init_cipher_ops(tfm);
288
289 case CRYPTO_ALG_TYPE_COMPRESS:
290 return crypto_init_compress_ops(tfm);
291
292 default:
293 break;
294 }
295
296 BUG();
297 return -EINVAL;
298}
299
300static void crypto_exit_ops(struct crypto_tfm *tfm)
301{
302 const struct crypto_type *type = tfm->__crt_alg->cra_type;
303
304 if (type) {
305 if (tfm->exit)
306 tfm->exit(tfm);
307 return;
308 }
309
310 switch (crypto_tfm_alg_type(tfm)) {
311 case CRYPTO_ALG_TYPE_CIPHER:
312 crypto_exit_cipher_ops(tfm);
313 break;
314
315 case CRYPTO_ALG_TYPE_COMPRESS:
316 crypto_exit_compress_ops(tfm);
317 break;
318
319 default:
320 BUG();
321 }
322}
323
324static unsigned int crypto_ctxsize(struct crypto_alg *alg, u32 type, u32 mask)
325{
326 const struct crypto_type *type_obj = alg->cra_type;
327 unsigned int len;
328
329 len = alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1);
330 if (type_obj)
331 return len + type_obj->ctxsize(alg, type, mask);
332
333 switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
334 default:
335 BUG();
336
337 case CRYPTO_ALG_TYPE_CIPHER:
338 len += crypto_cipher_ctxsize(alg);
339 break;
340
341 case CRYPTO_ALG_TYPE_COMPRESS:
342 len += crypto_compress_ctxsize(alg);
343 break;
344 }
345
346 return len;
347}
348
349void crypto_shoot_alg(struct crypto_alg *alg)
350{
351 down_write(&crypto_alg_sem);
352 alg->cra_flags |= CRYPTO_ALG_DYING;
353 up_write(&crypto_alg_sem);
354}
355EXPORT_SYMBOL_GPL(crypto_shoot_alg);
356
357struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
358 u32 mask)
359{
360 struct crypto_tfm *tfm = NULL;
361 unsigned int tfm_size;
362 int err = -ENOMEM;
363
364 tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask);
365 tfm = kzalloc(tfm_size, GFP_KERNEL);
366 if (tfm == NULL)
367 goto out_err;
368
369 tfm->__crt_alg = alg;
370
371 err = crypto_init_ops(tfm, type, mask);
372 if (err)
373 goto out_free_tfm;
374
375 if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
376 goto cra_init_failed;
377
378 goto out;
379
380cra_init_failed:
381 crypto_exit_ops(tfm);
382out_free_tfm:
383 if (err == -EAGAIN)
384 crypto_shoot_alg(alg);
385 kfree(tfm);
386out_err:
387 tfm = ERR_PTR(err);
388out:
389 return tfm;
390}
391EXPORT_SYMBOL_GPL(__crypto_alloc_tfm);
392
393/*
394 * crypto_alloc_base - Locate algorithm and allocate transform
395 * @alg_name: Name of algorithm
396 * @type: Type of algorithm
397 * @mask: Mask for type comparison
398 *
399 * This function should not be used by new algorithm types.
400 * Plesae use crypto_alloc_tfm instead.
401 *
402 * crypto_alloc_base() will first attempt to locate an already loaded
403 * algorithm. If that fails and the kernel supports dynamically loadable
404 * modules, it will then attempt to load a module of the same name or
405 * alias. If that fails it will send a query to any loaded crypto manager
406 * to construct an algorithm on the fly. A refcount is grabbed on the
407 * algorithm which is then associated with the new transform.
408 *
409 * The returned transform is of a non-determinate type. Most people
410 * should use one of the more specific allocation functions such as
411 * crypto_alloc_blkcipher.
412 *
413 * In case of error the return value is an error pointer.
414 */
415struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask)
416{
417 struct crypto_tfm *tfm;
418 int err;
419
420 for (;;) {
421 struct crypto_alg *alg;
422
423 alg = crypto_alg_mod_lookup(alg_name, type, mask);
424 if (IS_ERR(alg)) {
425 err = PTR_ERR(alg);
426 goto err;
427 }
428
429 tfm = __crypto_alloc_tfm(alg, type, mask);
430 if (!IS_ERR(tfm))
431 return tfm;
432
433 crypto_mod_put(alg);
434 err = PTR_ERR(tfm);
435
436err:
437 if (err != -EAGAIN)
438 break;
439 if (signal_pending(current)) {
440 err = -EINTR;
441 break;
442 }
443 }
444
445 return ERR_PTR(err);
446}
447EXPORT_SYMBOL_GPL(crypto_alloc_base);
448
449void *crypto_create_tfm(struct crypto_alg *alg,
450 const struct crypto_type *frontend)
451{
452 char *mem;
453 struct crypto_tfm *tfm = NULL;
454 unsigned int tfmsize;
455 unsigned int total;
456 int err = -ENOMEM;
457
458 tfmsize = frontend->tfmsize;
459 total = tfmsize + sizeof(*tfm) + frontend->extsize(alg);
460
461 mem = kzalloc(total, GFP_KERNEL);
462 if (mem == NULL)
463 goto out_err;
464
465 tfm = (struct crypto_tfm *)(mem + tfmsize);
466 tfm->__crt_alg = alg;
467
468 err = frontend->init_tfm(tfm);
469 if (err)
470 goto out_free_tfm;
471
472 if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
473 goto cra_init_failed;
474
475 goto out;
476
477cra_init_failed:
478 crypto_exit_ops(tfm);
479out_free_tfm:
480 if (err == -EAGAIN)
481 crypto_shoot_alg(alg);
482 kfree(mem);
483out_err:
484 mem = ERR_PTR(err);
485out:
486 return mem;
487}
488EXPORT_SYMBOL_GPL(crypto_create_tfm);
489
490struct crypto_alg *crypto_find_alg(const char *alg_name,
491 const struct crypto_type *frontend,
492 u32 type, u32 mask)
493{
494 struct crypto_alg *(*lookup)(const char *name, u32 type, u32 mask) =
495 crypto_alg_mod_lookup;
496
497 if (frontend) {
498 type &= frontend->maskclear;
499 mask &= frontend->maskclear;
500 type |= frontend->type;
501 mask |= frontend->maskset;
502
503 if (frontend->lookup)
504 lookup = frontend->lookup;
505 }
506
507 return lookup(alg_name, type, mask);
508}
509EXPORT_SYMBOL_GPL(crypto_find_alg);
510
511/*
512 * crypto_alloc_tfm - Locate algorithm and allocate transform
513 * @alg_name: Name of algorithm
514 * @frontend: Frontend algorithm type
515 * @type: Type of algorithm
516 * @mask: Mask for type comparison
517 *
518 * crypto_alloc_tfm() will first attempt to locate an already loaded
519 * algorithm. If that fails and the kernel supports dynamically loadable
520 * modules, it will then attempt to load a module of the same name or
521 * alias. If that fails it will send a query to any loaded crypto manager
522 * to construct an algorithm on the fly. A refcount is grabbed on the
523 * algorithm which is then associated with the new transform.
524 *
525 * The returned transform is of a non-determinate type. Most people
526 * should use one of the more specific allocation functions such as
527 * crypto_alloc_blkcipher.
528 *
529 * In case of error the return value is an error pointer.
530 */
531void *crypto_alloc_tfm(const char *alg_name,
532 const struct crypto_type *frontend, u32 type, u32 mask)
533{
534 void *tfm;
535 int err;
536
537 for (;;) {
538 struct crypto_alg *alg;
539
540 alg = crypto_find_alg(alg_name, frontend, type, mask);
541 if (IS_ERR(alg)) {
542 err = PTR_ERR(alg);
543 goto err;
544 }
545
546 tfm = crypto_create_tfm(alg, frontend);
547 if (!IS_ERR(tfm))
548 return tfm;
549
550 crypto_mod_put(alg);
551 err = PTR_ERR(tfm);
552
553err:
554 if (err != -EAGAIN)
555 break;
556 if (signal_pending(current)) {
557 err = -EINTR;
558 break;
559 }
560 }
561
562 return ERR_PTR(err);
563}
564EXPORT_SYMBOL_GPL(crypto_alloc_tfm);
565
566/*
567 * crypto_destroy_tfm - Free crypto transform
568 * @mem: Start of tfm slab
569 * @tfm: Transform to free
570 *
571 * This function frees up the transform and any associated resources,
572 * then drops the refcount on the associated algorithm.
573 */
574void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm)
575{
576 struct crypto_alg *alg;
577
578 if (unlikely(!mem))
579 return;
580
581 alg = tfm->__crt_alg;
582
583 if (!tfm->exit && alg->cra_exit)
584 alg->cra_exit(tfm);
585 crypto_exit_ops(tfm);
586 crypto_mod_put(alg);
587 kzfree(mem);
588}
589EXPORT_SYMBOL_GPL(crypto_destroy_tfm);
590
591int crypto_has_alg(const char *name, u32 type, u32 mask)
592{
593 int ret = 0;
594 struct crypto_alg *alg = crypto_alg_mod_lookup(name, type, mask);
595
596 if (!IS_ERR(alg)) {
597 crypto_mod_put(alg);
598 ret = 1;
599 }
600
601 return ret;
602}
603EXPORT_SYMBOL_GPL(crypto_has_alg);
604
605MODULE_DESCRIPTION("Cryptographic core API");
606MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Scatterlist Cryptographic API.
4 *
5 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
6 * Copyright (c) 2002 David S. Miller (davem@redhat.com)
7 * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
8 *
9 * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
10 * and Nettle, by Niels Möller.
11 */
12
13#include <linux/err.h>
14#include <linux/errno.h>
15#include <linux/kernel.h>
16#include <linux/kmod.h>
17#include <linux/module.h>
18#include <linux/param.h>
19#include <linux/sched/signal.h>
20#include <linux/slab.h>
21#include <linux/string.h>
22#include <linux/completion.h>
23#include "internal.h"
24
25LIST_HEAD(crypto_alg_list);
26EXPORT_SYMBOL_GPL(crypto_alg_list);
27DECLARE_RWSEM(crypto_alg_sem);
28EXPORT_SYMBOL_GPL(crypto_alg_sem);
29
30BLOCKING_NOTIFIER_HEAD(crypto_chain);
31EXPORT_SYMBOL_GPL(crypto_chain);
32
33static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg);
34
35struct crypto_alg *crypto_mod_get(struct crypto_alg *alg)
36{
37 return try_module_get(alg->cra_module) ? crypto_alg_get(alg) : NULL;
38}
39EXPORT_SYMBOL_GPL(crypto_mod_get);
40
41void crypto_mod_put(struct crypto_alg *alg)
42{
43 struct module *module = alg->cra_module;
44
45 crypto_alg_put(alg);
46 module_put(module);
47}
48EXPORT_SYMBOL_GPL(crypto_mod_put);
49
50static inline int crypto_is_test_larval(struct crypto_larval *larval)
51{
52 return larval->alg.cra_driver_name[0];
53}
54
55static struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type,
56 u32 mask)
57{
58 struct crypto_alg *q, *alg = NULL;
59 int best = -2;
60
61 list_for_each_entry(q, &crypto_alg_list, cra_list) {
62 int exact, fuzzy;
63
64 if (crypto_is_moribund(q))
65 continue;
66
67 if ((q->cra_flags ^ type) & mask)
68 continue;
69
70 if (crypto_is_larval(q) &&
71 !crypto_is_test_larval((struct crypto_larval *)q) &&
72 ((struct crypto_larval *)q)->mask != mask)
73 continue;
74
75 exact = !strcmp(q->cra_driver_name, name);
76 fuzzy = !strcmp(q->cra_name, name);
77 if (!exact && !(fuzzy && q->cra_priority > best))
78 continue;
79
80 if (unlikely(!crypto_mod_get(q)))
81 continue;
82
83 best = q->cra_priority;
84 if (alg)
85 crypto_mod_put(alg);
86 alg = q;
87
88 if (exact)
89 break;
90 }
91
92 return alg;
93}
94
95static void crypto_larval_destroy(struct crypto_alg *alg)
96{
97 struct crypto_larval *larval = (void *)alg;
98
99 BUG_ON(!crypto_is_larval(alg));
100 if (!IS_ERR_OR_NULL(larval->adult))
101 crypto_mod_put(larval->adult);
102 kfree(larval);
103}
104
105struct crypto_larval *crypto_larval_alloc(const char *name, u32 type, u32 mask)
106{
107 struct crypto_larval *larval;
108
109 larval = kzalloc(sizeof(*larval), GFP_KERNEL);
110 if (!larval)
111 return ERR_PTR(-ENOMEM);
112
113 larval->mask = mask;
114 larval->alg.cra_flags = CRYPTO_ALG_LARVAL | type;
115 larval->alg.cra_priority = -1;
116 larval->alg.cra_destroy = crypto_larval_destroy;
117
118 strlcpy(larval->alg.cra_name, name, CRYPTO_MAX_ALG_NAME);
119 init_completion(&larval->completion);
120
121 return larval;
122}
123EXPORT_SYMBOL_GPL(crypto_larval_alloc);
124
125static struct crypto_alg *crypto_larval_add(const char *name, u32 type,
126 u32 mask)
127{
128 struct crypto_alg *alg;
129 struct crypto_larval *larval;
130
131 larval = crypto_larval_alloc(name, type, mask);
132 if (IS_ERR(larval))
133 return ERR_CAST(larval);
134
135 refcount_set(&larval->alg.cra_refcnt, 2);
136
137 down_write(&crypto_alg_sem);
138 alg = __crypto_alg_lookup(name, type, mask);
139 if (!alg) {
140 alg = &larval->alg;
141 list_add(&alg->cra_list, &crypto_alg_list);
142 }
143 up_write(&crypto_alg_sem);
144
145 if (alg != &larval->alg) {
146 kfree(larval);
147 if (crypto_is_larval(alg))
148 alg = crypto_larval_wait(alg);
149 }
150
151 return alg;
152}
153
154void crypto_larval_kill(struct crypto_alg *alg)
155{
156 struct crypto_larval *larval = (void *)alg;
157
158 down_write(&crypto_alg_sem);
159 list_del(&alg->cra_list);
160 up_write(&crypto_alg_sem);
161 complete_all(&larval->completion);
162 crypto_alg_put(alg);
163}
164EXPORT_SYMBOL_GPL(crypto_larval_kill);
165
166static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg)
167{
168 struct crypto_larval *larval = (void *)alg;
169 long timeout;
170
171 timeout = wait_for_completion_killable_timeout(
172 &larval->completion, 60 * HZ);
173
174 alg = larval->adult;
175 if (timeout < 0)
176 alg = ERR_PTR(-EINTR);
177 else if (!timeout)
178 alg = ERR_PTR(-ETIMEDOUT);
179 else if (!alg)
180 alg = ERR_PTR(-ENOENT);
181 else if (IS_ERR(alg))
182 ;
183 else if (crypto_is_test_larval(larval) &&
184 !(alg->cra_flags & CRYPTO_ALG_TESTED))
185 alg = ERR_PTR(-EAGAIN);
186 else if (!crypto_mod_get(alg))
187 alg = ERR_PTR(-EAGAIN);
188 crypto_mod_put(&larval->alg);
189
190 return alg;
191}
192
193static struct crypto_alg *crypto_alg_lookup(const char *name, u32 type,
194 u32 mask)
195{
196 struct crypto_alg *alg;
197 u32 test = 0;
198
199 if (!((type | mask) & CRYPTO_ALG_TESTED))
200 test |= CRYPTO_ALG_TESTED;
201
202 down_read(&crypto_alg_sem);
203 alg = __crypto_alg_lookup(name, type | test, mask | test);
204 if (!alg && test) {
205 alg = __crypto_alg_lookup(name, type, mask);
206 if (alg && !crypto_is_larval(alg)) {
207 /* Test failed */
208 crypto_mod_put(alg);
209 alg = ERR_PTR(-ELIBBAD);
210 }
211 }
212 up_read(&crypto_alg_sem);
213
214 return alg;
215}
216
217static struct crypto_alg *crypto_larval_lookup(const char *name, u32 type,
218 u32 mask)
219{
220 struct crypto_alg *alg;
221
222 if (!name)
223 return ERR_PTR(-ENOENT);
224
225 type &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD);
226 mask &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD);
227
228 alg = crypto_alg_lookup(name, type, mask);
229 if (!alg && !(mask & CRYPTO_NOLOAD)) {
230 request_module("crypto-%s", name);
231
232 if (!((type ^ CRYPTO_ALG_NEED_FALLBACK) & mask &
233 CRYPTO_ALG_NEED_FALLBACK))
234 request_module("crypto-%s-all", name);
235
236 alg = crypto_alg_lookup(name, type, mask);
237 }
238
239 if (!IS_ERR_OR_NULL(alg) && crypto_is_larval(alg))
240 alg = crypto_larval_wait(alg);
241 else if (!alg)
242 alg = crypto_larval_add(name, type, mask);
243
244 return alg;
245}
246
247int crypto_probing_notify(unsigned long val, void *v)
248{
249 int ok;
250
251 ok = blocking_notifier_call_chain(&crypto_chain, val, v);
252 if (ok == NOTIFY_DONE) {
253 request_module("cryptomgr");
254 ok = blocking_notifier_call_chain(&crypto_chain, val, v);
255 }
256
257 return ok;
258}
259EXPORT_SYMBOL_GPL(crypto_probing_notify);
260
261struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask)
262{
263 struct crypto_alg *alg;
264 struct crypto_alg *larval;
265 int ok;
266
267 /*
268 * If the internal flag is set for a cipher, require a caller to
269 * to invoke the cipher with the internal flag to use that cipher.
270 * Also, if a caller wants to allocate a cipher that may or may
271 * not be an internal cipher, use type | CRYPTO_ALG_INTERNAL and
272 * !(mask & CRYPTO_ALG_INTERNAL).
273 */
274 if (!((type | mask) & CRYPTO_ALG_INTERNAL))
275 mask |= CRYPTO_ALG_INTERNAL;
276
277 larval = crypto_larval_lookup(name, type, mask);
278 if (IS_ERR(larval) || !crypto_is_larval(larval))
279 return larval;
280
281 ok = crypto_probing_notify(CRYPTO_MSG_ALG_REQUEST, larval);
282
283 if (ok == NOTIFY_STOP)
284 alg = crypto_larval_wait(larval);
285 else {
286 crypto_mod_put(larval);
287 alg = ERR_PTR(-ENOENT);
288 }
289 crypto_larval_kill(larval);
290 return alg;
291}
292EXPORT_SYMBOL_GPL(crypto_alg_mod_lookup);
293
294static int crypto_init_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
295{
296 const struct crypto_type *type_obj = tfm->__crt_alg->cra_type;
297
298 if (type_obj)
299 return type_obj->init(tfm, type, mask);
300 return 0;
301}
302
303static void crypto_exit_ops(struct crypto_tfm *tfm)
304{
305 const struct crypto_type *type = tfm->__crt_alg->cra_type;
306
307 if (type && tfm->exit)
308 tfm->exit(tfm);
309}
310
311static unsigned int crypto_ctxsize(struct crypto_alg *alg, u32 type, u32 mask)
312{
313 const struct crypto_type *type_obj = alg->cra_type;
314 unsigned int len;
315
316 len = alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1);
317 if (type_obj)
318 return len + type_obj->ctxsize(alg, type, mask);
319
320 switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
321 default:
322 BUG();
323
324 case CRYPTO_ALG_TYPE_CIPHER:
325 len += crypto_cipher_ctxsize(alg);
326 break;
327
328 case CRYPTO_ALG_TYPE_COMPRESS:
329 len += crypto_compress_ctxsize(alg);
330 break;
331 }
332
333 return len;
334}
335
336void crypto_shoot_alg(struct crypto_alg *alg)
337{
338 down_write(&crypto_alg_sem);
339 alg->cra_flags |= CRYPTO_ALG_DYING;
340 up_write(&crypto_alg_sem);
341}
342EXPORT_SYMBOL_GPL(crypto_shoot_alg);
343
344struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
345 u32 mask)
346{
347 struct crypto_tfm *tfm = NULL;
348 unsigned int tfm_size;
349 int err = -ENOMEM;
350
351 tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask);
352 tfm = kzalloc(tfm_size, GFP_KERNEL);
353 if (tfm == NULL)
354 goto out_err;
355
356 tfm->__crt_alg = alg;
357
358 err = crypto_init_ops(tfm, type, mask);
359 if (err)
360 goto out_free_tfm;
361
362 if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
363 goto cra_init_failed;
364
365 goto out;
366
367cra_init_failed:
368 crypto_exit_ops(tfm);
369out_free_tfm:
370 if (err == -EAGAIN)
371 crypto_shoot_alg(alg);
372 kfree(tfm);
373out_err:
374 tfm = ERR_PTR(err);
375out:
376 return tfm;
377}
378EXPORT_SYMBOL_GPL(__crypto_alloc_tfm);
379
380/*
381 * crypto_alloc_base - Locate algorithm and allocate transform
382 * @alg_name: Name of algorithm
383 * @type: Type of algorithm
384 * @mask: Mask for type comparison
385 *
386 * This function should not be used by new algorithm types.
387 * Please use crypto_alloc_tfm instead.
388 *
389 * crypto_alloc_base() will first attempt to locate an already loaded
390 * algorithm. If that fails and the kernel supports dynamically loadable
391 * modules, it will then attempt to load a module of the same name or
392 * alias. If that fails it will send a query to any loaded crypto manager
393 * to construct an algorithm on the fly. A refcount is grabbed on the
394 * algorithm which is then associated with the new transform.
395 *
396 * The returned transform is of a non-determinate type. Most people
397 * should use one of the more specific allocation functions such as
398 * crypto_alloc_skcipher().
399 *
400 * In case of error the return value is an error pointer.
401 */
402struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask)
403{
404 struct crypto_tfm *tfm;
405 int err;
406
407 for (;;) {
408 struct crypto_alg *alg;
409
410 alg = crypto_alg_mod_lookup(alg_name, type, mask);
411 if (IS_ERR(alg)) {
412 err = PTR_ERR(alg);
413 goto err;
414 }
415
416 tfm = __crypto_alloc_tfm(alg, type, mask);
417 if (!IS_ERR(tfm))
418 return tfm;
419
420 crypto_mod_put(alg);
421 err = PTR_ERR(tfm);
422
423err:
424 if (err != -EAGAIN)
425 break;
426 if (fatal_signal_pending(current)) {
427 err = -EINTR;
428 break;
429 }
430 }
431
432 return ERR_PTR(err);
433}
434EXPORT_SYMBOL_GPL(crypto_alloc_base);
435
436void *crypto_create_tfm_node(struct crypto_alg *alg,
437 const struct crypto_type *frontend,
438 int node)
439{
440 char *mem;
441 struct crypto_tfm *tfm = NULL;
442 unsigned int tfmsize;
443 unsigned int total;
444 int err = -ENOMEM;
445
446 tfmsize = frontend->tfmsize;
447 total = tfmsize + sizeof(*tfm) + frontend->extsize(alg);
448
449 mem = kzalloc_node(total, GFP_KERNEL, node);
450 if (mem == NULL)
451 goto out_err;
452
453 tfm = (struct crypto_tfm *)(mem + tfmsize);
454 tfm->__crt_alg = alg;
455 tfm->node = node;
456
457 err = frontend->init_tfm(tfm);
458 if (err)
459 goto out_free_tfm;
460
461 if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
462 goto cra_init_failed;
463
464 goto out;
465
466cra_init_failed:
467 crypto_exit_ops(tfm);
468out_free_tfm:
469 if (err == -EAGAIN)
470 crypto_shoot_alg(alg);
471 kfree(mem);
472out_err:
473 mem = ERR_PTR(err);
474out:
475 return mem;
476}
477EXPORT_SYMBOL_GPL(crypto_create_tfm_node);
478
479struct crypto_alg *crypto_find_alg(const char *alg_name,
480 const struct crypto_type *frontend,
481 u32 type, u32 mask)
482{
483 if (frontend) {
484 type &= frontend->maskclear;
485 mask &= frontend->maskclear;
486 type |= frontend->type;
487 mask |= frontend->maskset;
488 }
489
490 return crypto_alg_mod_lookup(alg_name, type, mask);
491}
492EXPORT_SYMBOL_GPL(crypto_find_alg);
493
494/*
495 * crypto_alloc_tfm_node - Locate algorithm and allocate transform
496 * @alg_name: Name of algorithm
497 * @frontend: Frontend algorithm type
498 * @type: Type of algorithm
499 * @mask: Mask for type comparison
500 * @node: NUMA node in which users desire to put requests, if node is
501 * NUMA_NO_NODE, it means users have no special requirement.
502 *
503 * crypto_alloc_tfm() will first attempt to locate an already loaded
504 * algorithm. If that fails and the kernel supports dynamically loadable
505 * modules, it will then attempt to load a module of the same name or
506 * alias. If that fails it will send a query to any loaded crypto manager
507 * to construct an algorithm on the fly. A refcount is grabbed on the
508 * algorithm which is then associated with the new transform.
509 *
510 * The returned transform is of a non-determinate type. Most people
511 * should use one of the more specific allocation functions such as
512 * crypto_alloc_skcipher().
513 *
514 * In case of error the return value is an error pointer.
515 */
516
517void *crypto_alloc_tfm_node(const char *alg_name,
518 const struct crypto_type *frontend, u32 type, u32 mask,
519 int node)
520{
521 void *tfm;
522 int err;
523
524 for (;;) {
525 struct crypto_alg *alg;
526
527 alg = crypto_find_alg(alg_name, frontend, type, mask);
528 if (IS_ERR(alg)) {
529 err = PTR_ERR(alg);
530 goto err;
531 }
532
533 tfm = crypto_create_tfm_node(alg, frontend, node);
534 if (!IS_ERR(tfm))
535 return tfm;
536
537 crypto_mod_put(alg);
538 err = PTR_ERR(tfm);
539
540err:
541 if (err != -EAGAIN)
542 break;
543 if (fatal_signal_pending(current)) {
544 err = -EINTR;
545 break;
546 }
547 }
548
549 return ERR_PTR(err);
550}
551EXPORT_SYMBOL_GPL(crypto_alloc_tfm_node);
552
553/*
554 * crypto_destroy_tfm - Free crypto transform
555 * @mem: Start of tfm slab
556 * @tfm: Transform to free
557 *
558 * This function frees up the transform and any associated resources,
559 * then drops the refcount on the associated algorithm.
560 */
561void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm)
562{
563 struct crypto_alg *alg;
564
565 if (IS_ERR_OR_NULL(mem))
566 return;
567
568 alg = tfm->__crt_alg;
569
570 if (!tfm->exit && alg->cra_exit)
571 alg->cra_exit(tfm);
572 crypto_exit_ops(tfm);
573 crypto_mod_put(alg);
574 kfree_sensitive(mem);
575}
576EXPORT_SYMBOL_GPL(crypto_destroy_tfm);
577
578int crypto_has_alg(const char *name, u32 type, u32 mask)
579{
580 int ret = 0;
581 struct crypto_alg *alg = crypto_alg_mod_lookup(name, type, mask);
582
583 if (!IS_ERR(alg)) {
584 crypto_mod_put(alg);
585 ret = 1;
586 }
587
588 return ret;
589}
590EXPORT_SYMBOL_GPL(crypto_has_alg);
591
592void crypto_req_done(struct crypto_async_request *req, int err)
593{
594 struct crypto_wait *wait = req->data;
595
596 if (err == -EINPROGRESS)
597 return;
598
599 wait->err = err;
600 complete(&wait->completion);
601}
602EXPORT_SYMBOL_GPL(crypto_req_done);
603
604MODULE_DESCRIPTION("Cryptographic core API");
605MODULE_LICENSE("GPL");
606MODULE_SOFTDEP("pre: cryptomgr");