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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Cryptographic API for algorithms (i.e., low-level API).
4 *
5 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
6 */
7
8#include <crypto/algapi.h>
9#include <linux/err.h>
10#include <linux/errno.h>
11#include <linux/fips.h>
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/list.h>
15#include <linux/module.h>
16#include <linux/rtnetlink.h>
17#include <linux/slab.h>
18#include <linux/string.h>
19#include <linux/workqueue.h>
20
21#include "internal.h"
22
23static LIST_HEAD(crypto_template_list);
24
25static inline void crypto_check_module_sig(struct module *mod)
26{
27 if (fips_enabled && mod && !module_sig_ok(mod))
28 panic("Module %s signature verification failed in FIPS mode\n",
29 module_name(mod));
30}
31
32static int crypto_check_alg(struct crypto_alg *alg)
33{
34 crypto_check_module_sig(alg->cra_module);
35
36 if (!alg->cra_name[0] || !alg->cra_driver_name[0])
37 return -EINVAL;
38
39 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
40 return -EINVAL;
41
42 /* General maximums for all algs. */
43 if (alg->cra_alignmask > MAX_ALGAPI_ALIGNMASK)
44 return -EINVAL;
45
46 if (alg->cra_blocksize > MAX_ALGAPI_BLOCKSIZE)
47 return -EINVAL;
48
49 /* Lower maximums for specific alg types. */
50 if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
51 CRYPTO_ALG_TYPE_CIPHER) {
52 if (alg->cra_alignmask > MAX_CIPHER_ALIGNMASK)
53 return -EINVAL;
54
55 if (alg->cra_blocksize > MAX_CIPHER_BLOCKSIZE)
56 return -EINVAL;
57 }
58
59 if (alg->cra_priority < 0)
60 return -EINVAL;
61
62 refcount_set(&alg->cra_refcnt, 1);
63
64 return 0;
65}
66
67static void crypto_free_instance(struct crypto_instance *inst)
68{
69 inst->alg.cra_type->free(inst);
70}
71
72static void crypto_destroy_instance_workfn(struct work_struct *w)
73{
74 struct crypto_instance *inst = container_of(w, struct crypto_instance,
75 free_work);
76 struct crypto_template *tmpl = inst->tmpl;
77
78 crypto_free_instance(inst);
79 crypto_tmpl_put(tmpl);
80}
81
82static void crypto_destroy_instance(struct crypto_alg *alg)
83{
84 struct crypto_instance *inst = container_of(alg,
85 struct crypto_instance,
86 alg);
87
88 INIT_WORK(&inst->free_work, crypto_destroy_instance_workfn);
89 schedule_work(&inst->free_work);
90}
91
92/*
93 * This function adds a spawn to the list secondary_spawns which
94 * will be used at the end of crypto_remove_spawns to unregister
95 * instances, unless the spawn happens to be one that is depended
96 * on by the new algorithm (nalg in crypto_remove_spawns).
97 *
98 * This function is also responsible for resurrecting any algorithms
99 * in the dependency chain of nalg by unsetting n->dead.
100 */
101static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
102 struct list_head *stack,
103 struct list_head *top,
104 struct list_head *secondary_spawns)
105{
106 struct crypto_spawn *spawn, *n;
107
108 spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
109 if (!spawn)
110 return NULL;
111
112 n = list_prev_entry(spawn, list);
113 list_move(&spawn->list, secondary_spawns);
114
115 if (list_is_last(&n->list, stack))
116 return top;
117
118 n = list_next_entry(n, list);
119 if (!spawn->dead)
120 n->dead = false;
121
122 return &n->inst->alg.cra_users;
123}
124
125static void crypto_remove_instance(struct crypto_instance *inst,
126 struct list_head *list)
127{
128 struct crypto_template *tmpl = inst->tmpl;
129
130 if (crypto_is_dead(&inst->alg))
131 return;
132
133 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
134
135 if (!tmpl || !crypto_tmpl_get(tmpl))
136 return;
137
138 list_move(&inst->alg.cra_list, list);
139 hlist_del(&inst->list);
140 inst->alg.cra_destroy = crypto_destroy_instance;
141
142 BUG_ON(!list_empty(&inst->alg.cra_users));
143}
144
145/*
146 * Given an algorithm alg, remove all algorithms that depend on it
147 * through spawns. If nalg is not null, then exempt any algorithms
148 * that is depended on by nalg. This is useful when nalg itself
149 * depends on alg.
150 */
151void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
152 struct crypto_alg *nalg)
153{
154 u32 new_type = (nalg ?: alg)->cra_flags;
155 struct crypto_spawn *spawn, *n;
156 LIST_HEAD(secondary_spawns);
157 struct list_head *spawns;
158 LIST_HEAD(stack);
159 LIST_HEAD(top);
160
161 spawns = &alg->cra_users;
162 list_for_each_entry_safe(spawn, n, spawns, list) {
163 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
164 continue;
165
166 list_move(&spawn->list, &top);
167 }
168
169 /*
170 * Perform a depth-first walk starting from alg through
171 * the cra_users tree. The list stack records the path
172 * from alg to the current spawn.
173 */
174 spawns = ⊤
175 do {
176 while (!list_empty(spawns)) {
177 struct crypto_instance *inst;
178
179 spawn = list_first_entry(spawns, struct crypto_spawn,
180 list);
181 inst = spawn->inst;
182
183 list_move(&spawn->list, &stack);
184 spawn->dead = !spawn->registered || &inst->alg != nalg;
185
186 if (!spawn->registered)
187 break;
188
189 BUG_ON(&inst->alg == alg);
190
191 if (&inst->alg == nalg)
192 break;
193
194 spawns = &inst->alg.cra_users;
195
196 /*
197 * Even if spawn->registered is true, the
198 * instance itself may still be unregistered.
199 * This is because it may have failed during
200 * registration. Therefore we still need to
201 * make the following test.
202 *
203 * We may encounter an unregistered instance here, since
204 * an instance's spawns are set up prior to the instance
205 * being registered. An unregistered instance will have
206 * NULL ->cra_users.next, since ->cra_users isn't
207 * properly initialized until registration. But an
208 * unregistered instance cannot have any users, so treat
209 * it the same as ->cra_users being empty.
210 */
211 if (spawns->next == NULL)
212 break;
213 }
214 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
215 &secondary_spawns)));
216
217 /*
218 * Remove all instances that are marked as dead. Also
219 * complete the resurrection of the others by moving them
220 * back to the cra_users list.
221 */
222 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
223 if (!spawn->dead)
224 list_move(&spawn->list, &spawn->alg->cra_users);
225 else if (spawn->registered)
226 crypto_remove_instance(spawn->inst, list);
227 }
228}
229EXPORT_SYMBOL_GPL(crypto_remove_spawns);
230
231static void crypto_alg_finish_registration(struct crypto_alg *alg,
232 struct list_head *algs_to_put)
233{
234 struct crypto_alg *q;
235
236 list_for_each_entry(q, &crypto_alg_list, cra_list) {
237 if (q == alg)
238 continue;
239
240 if (crypto_is_moribund(q))
241 continue;
242
243 if (crypto_is_larval(q))
244 continue;
245
246 if (strcmp(alg->cra_name, q->cra_name))
247 continue;
248
249 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
250 q->cra_priority > alg->cra_priority)
251 continue;
252
253 crypto_remove_spawns(q, algs_to_put, alg);
254 }
255
256 crypto_notify(CRYPTO_MSG_ALG_LOADED, alg);
257}
258
259static struct crypto_larval *crypto_alloc_test_larval(struct crypto_alg *alg)
260{
261 struct crypto_larval *larval;
262
263 if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER) ||
264 IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS) ||
265 (alg->cra_flags & CRYPTO_ALG_INTERNAL))
266 return NULL; /* No self-test needed */
267
268 larval = crypto_larval_alloc(alg->cra_name,
269 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
270 if (IS_ERR(larval))
271 return larval;
272
273 larval->adult = crypto_mod_get(alg);
274 if (!larval->adult) {
275 kfree(larval);
276 return ERR_PTR(-ENOENT);
277 }
278
279 refcount_set(&larval->alg.cra_refcnt, 1);
280 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
281 CRYPTO_MAX_ALG_NAME);
282 larval->alg.cra_priority = alg->cra_priority;
283
284 return larval;
285}
286
287static struct crypto_larval *
288__crypto_register_alg(struct crypto_alg *alg, struct list_head *algs_to_put)
289{
290 struct crypto_alg *q;
291 struct crypto_larval *larval;
292 int ret = -EAGAIN;
293
294 if (crypto_is_dead(alg))
295 goto err;
296
297 INIT_LIST_HEAD(&alg->cra_users);
298
299 ret = -EEXIST;
300
301 list_for_each_entry(q, &crypto_alg_list, cra_list) {
302 if (q == alg)
303 goto err;
304
305 if (crypto_is_moribund(q))
306 continue;
307
308 if (crypto_is_larval(q)) {
309 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
310 goto err;
311 continue;
312 }
313
314 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
315 !strcmp(q->cra_driver_name, alg->cra_driver_name) ||
316 !strcmp(q->cra_name, alg->cra_driver_name))
317 goto err;
318 }
319
320 larval = crypto_alloc_test_larval(alg);
321 if (IS_ERR(larval))
322 goto out;
323
324 list_add(&alg->cra_list, &crypto_alg_list);
325
326 if (larval) {
327 /* No cheating! */
328 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
329
330 list_add(&larval->alg.cra_list, &crypto_alg_list);
331 } else {
332 alg->cra_flags |= CRYPTO_ALG_TESTED;
333 crypto_alg_finish_registration(alg, algs_to_put);
334 }
335
336out:
337 return larval;
338
339err:
340 larval = ERR_PTR(ret);
341 goto out;
342}
343
344void crypto_alg_tested(const char *name, int err)
345{
346 struct crypto_larval *test;
347 struct crypto_alg *alg;
348 struct crypto_alg *q;
349 LIST_HEAD(list);
350
351 down_write(&crypto_alg_sem);
352 list_for_each_entry(q, &crypto_alg_list, cra_list) {
353 if (crypto_is_moribund(q) || !crypto_is_larval(q))
354 continue;
355
356 test = (struct crypto_larval *)q;
357
358 if (!strcmp(q->cra_driver_name, name))
359 goto found;
360 }
361
362 pr_err("alg: Unexpected test result for %s: %d\n", name, err);
363 up_write(&crypto_alg_sem);
364 return;
365
366found:
367 q->cra_flags |= CRYPTO_ALG_DEAD;
368 alg = test->adult;
369
370 if (crypto_is_dead(alg))
371 goto complete;
372
373 if (err == -ECANCELED)
374 alg->cra_flags |= CRYPTO_ALG_FIPS_INTERNAL;
375 else if (err)
376 goto complete;
377 else
378 alg->cra_flags &= ~CRYPTO_ALG_FIPS_INTERNAL;
379
380 alg->cra_flags |= CRYPTO_ALG_TESTED;
381
382 crypto_alg_finish_registration(alg, &list);
383
384complete:
385 list_del_init(&test->alg.cra_list);
386 complete_all(&test->completion);
387
388 up_write(&crypto_alg_sem);
389
390 crypto_alg_put(&test->alg);
391 crypto_remove_final(&list);
392}
393EXPORT_SYMBOL_GPL(crypto_alg_tested);
394
395void crypto_remove_final(struct list_head *list)
396{
397 struct crypto_alg *alg;
398 struct crypto_alg *n;
399
400 list_for_each_entry_safe(alg, n, list, cra_list) {
401 list_del_init(&alg->cra_list);
402 crypto_alg_put(alg);
403 }
404}
405EXPORT_SYMBOL_GPL(crypto_remove_final);
406
407int crypto_register_alg(struct crypto_alg *alg)
408{
409 struct crypto_larval *larval;
410 LIST_HEAD(algs_to_put);
411 int err;
412
413 alg->cra_flags &= ~CRYPTO_ALG_DEAD;
414 err = crypto_check_alg(alg);
415 if (err)
416 return err;
417
418 down_write(&crypto_alg_sem);
419 larval = __crypto_register_alg(alg, &algs_to_put);
420 if (!IS_ERR_OR_NULL(larval)) {
421 bool test_started = crypto_boot_test_finished();
422
423 larval->test_started = test_started;
424 if (test_started)
425 crypto_schedule_test(larval);
426 }
427 up_write(&crypto_alg_sem);
428
429 if (IS_ERR(larval))
430 return PTR_ERR(larval);
431 crypto_remove_final(&algs_to_put);
432 return 0;
433}
434EXPORT_SYMBOL_GPL(crypto_register_alg);
435
436static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
437{
438 if (unlikely(list_empty(&alg->cra_list)))
439 return -ENOENT;
440
441 alg->cra_flags |= CRYPTO_ALG_DEAD;
442
443 list_del_init(&alg->cra_list);
444 crypto_remove_spawns(alg, list, NULL);
445
446 return 0;
447}
448
449void crypto_unregister_alg(struct crypto_alg *alg)
450{
451 int ret;
452 LIST_HEAD(list);
453
454 down_write(&crypto_alg_sem);
455 ret = crypto_remove_alg(alg, &list);
456 up_write(&crypto_alg_sem);
457
458 if (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name))
459 return;
460
461 if (WARN_ON(refcount_read(&alg->cra_refcnt) != 1))
462 return;
463
464 if (alg->cra_destroy)
465 alg->cra_destroy(alg);
466
467 crypto_remove_final(&list);
468}
469EXPORT_SYMBOL_GPL(crypto_unregister_alg);
470
471int crypto_register_algs(struct crypto_alg *algs, int count)
472{
473 int i, ret;
474
475 for (i = 0; i < count; i++) {
476 ret = crypto_register_alg(&algs[i]);
477 if (ret)
478 goto err;
479 }
480
481 return 0;
482
483err:
484 for (--i; i >= 0; --i)
485 crypto_unregister_alg(&algs[i]);
486
487 return ret;
488}
489EXPORT_SYMBOL_GPL(crypto_register_algs);
490
491void crypto_unregister_algs(struct crypto_alg *algs, int count)
492{
493 int i;
494
495 for (i = 0; i < count; i++)
496 crypto_unregister_alg(&algs[i]);
497}
498EXPORT_SYMBOL_GPL(crypto_unregister_algs);
499
500int crypto_register_template(struct crypto_template *tmpl)
501{
502 struct crypto_template *q;
503 int err = -EEXIST;
504
505 down_write(&crypto_alg_sem);
506
507 crypto_check_module_sig(tmpl->module);
508
509 list_for_each_entry(q, &crypto_template_list, list) {
510 if (q == tmpl)
511 goto out;
512 }
513
514 list_add(&tmpl->list, &crypto_template_list);
515 err = 0;
516out:
517 up_write(&crypto_alg_sem);
518 return err;
519}
520EXPORT_SYMBOL_GPL(crypto_register_template);
521
522int crypto_register_templates(struct crypto_template *tmpls, int count)
523{
524 int i, err;
525
526 for (i = 0; i < count; i++) {
527 err = crypto_register_template(&tmpls[i]);
528 if (err)
529 goto out;
530 }
531 return 0;
532
533out:
534 for (--i; i >= 0; --i)
535 crypto_unregister_template(&tmpls[i]);
536 return err;
537}
538EXPORT_SYMBOL_GPL(crypto_register_templates);
539
540void crypto_unregister_template(struct crypto_template *tmpl)
541{
542 struct crypto_instance *inst;
543 struct hlist_node *n;
544 struct hlist_head *list;
545 LIST_HEAD(users);
546
547 down_write(&crypto_alg_sem);
548
549 BUG_ON(list_empty(&tmpl->list));
550 list_del_init(&tmpl->list);
551
552 list = &tmpl->instances;
553 hlist_for_each_entry(inst, list, list) {
554 int err = crypto_remove_alg(&inst->alg, &users);
555
556 BUG_ON(err);
557 }
558
559 up_write(&crypto_alg_sem);
560
561 hlist_for_each_entry_safe(inst, n, list, list) {
562 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
563 crypto_free_instance(inst);
564 }
565 crypto_remove_final(&users);
566}
567EXPORT_SYMBOL_GPL(crypto_unregister_template);
568
569void crypto_unregister_templates(struct crypto_template *tmpls, int count)
570{
571 int i;
572
573 for (i = count - 1; i >= 0; --i)
574 crypto_unregister_template(&tmpls[i]);
575}
576EXPORT_SYMBOL_GPL(crypto_unregister_templates);
577
578static struct crypto_template *__crypto_lookup_template(const char *name)
579{
580 struct crypto_template *q, *tmpl = NULL;
581
582 down_read(&crypto_alg_sem);
583 list_for_each_entry(q, &crypto_template_list, list) {
584 if (strcmp(q->name, name))
585 continue;
586 if (unlikely(!crypto_tmpl_get(q)))
587 continue;
588
589 tmpl = q;
590 break;
591 }
592 up_read(&crypto_alg_sem);
593
594 return tmpl;
595}
596
597struct crypto_template *crypto_lookup_template(const char *name)
598{
599 return try_then_request_module(__crypto_lookup_template(name),
600 "crypto-%s", name);
601}
602EXPORT_SYMBOL_GPL(crypto_lookup_template);
603
604int crypto_register_instance(struct crypto_template *tmpl,
605 struct crypto_instance *inst)
606{
607 struct crypto_larval *larval;
608 struct crypto_spawn *spawn;
609 u32 fips_internal = 0;
610 LIST_HEAD(algs_to_put);
611 int err;
612
613 err = crypto_check_alg(&inst->alg);
614 if (err)
615 return err;
616
617 inst->alg.cra_module = tmpl->module;
618 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
619
620 down_write(&crypto_alg_sem);
621
622 larval = ERR_PTR(-EAGAIN);
623 for (spawn = inst->spawns; spawn;) {
624 struct crypto_spawn *next;
625
626 if (spawn->dead)
627 goto unlock;
628
629 next = spawn->next;
630 spawn->inst = inst;
631 spawn->registered = true;
632
633 fips_internal |= spawn->alg->cra_flags;
634
635 crypto_mod_put(spawn->alg);
636
637 spawn = next;
638 }
639
640 inst->alg.cra_flags |= (fips_internal & CRYPTO_ALG_FIPS_INTERNAL);
641
642 larval = __crypto_register_alg(&inst->alg, &algs_to_put);
643 if (IS_ERR(larval))
644 goto unlock;
645 else if (larval) {
646 larval->test_started = true;
647 crypto_schedule_test(larval);
648 }
649
650 hlist_add_head(&inst->list, &tmpl->instances);
651 inst->tmpl = tmpl;
652
653unlock:
654 up_write(&crypto_alg_sem);
655
656 if (IS_ERR(larval))
657 return PTR_ERR(larval);
658 crypto_remove_final(&algs_to_put);
659 return 0;
660}
661EXPORT_SYMBOL_GPL(crypto_register_instance);
662
663void crypto_unregister_instance(struct crypto_instance *inst)
664{
665 LIST_HEAD(list);
666
667 down_write(&crypto_alg_sem);
668
669 crypto_remove_spawns(&inst->alg, &list, NULL);
670 crypto_remove_instance(inst, &list);
671
672 up_write(&crypto_alg_sem);
673
674 crypto_remove_final(&list);
675}
676EXPORT_SYMBOL_GPL(crypto_unregister_instance);
677
678int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
679 const char *name, u32 type, u32 mask)
680{
681 struct crypto_alg *alg;
682 int err = -EAGAIN;
683
684 if (WARN_ON_ONCE(inst == NULL))
685 return -EINVAL;
686
687 /* Allow the result of crypto_attr_alg_name() to be passed directly */
688 if (IS_ERR(name))
689 return PTR_ERR(name);
690
691 alg = crypto_find_alg(name, spawn->frontend,
692 type | CRYPTO_ALG_FIPS_INTERNAL, mask);
693 if (IS_ERR(alg))
694 return PTR_ERR(alg);
695
696 down_write(&crypto_alg_sem);
697 if (!crypto_is_moribund(alg)) {
698 list_add(&spawn->list, &alg->cra_users);
699 spawn->alg = alg;
700 spawn->mask = mask;
701 spawn->next = inst->spawns;
702 inst->spawns = spawn;
703 inst->alg.cra_flags |=
704 (alg->cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
705 err = 0;
706 }
707 up_write(&crypto_alg_sem);
708 if (err)
709 crypto_mod_put(alg);
710 return err;
711}
712EXPORT_SYMBOL_GPL(crypto_grab_spawn);
713
714void crypto_drop_spawn(struct crypto_spawn *spawn)
715{
716 if (!spawn->alg) /* not yet initialized? */
717 return;
718
719 down_write(&crypto_alg_sem);
720 if (!spawn->dead)
721 list_del(&spawn->list);
722 up_write(&crypto_alg_sem);
723
724 if (!spawn->registered)
725 crypto_mod_put(spawn->alg);
726}
727EXPORT_SYMBOL_GPL(crypto_drop_spawn);
728
729static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
730{
731 struct crypto_alg *alg = ERR_PTR(-EAGAIN);
732 struct crypto_alg *target;
733 bool shoot = false;
734
735 down_read(&crypto_alg_sem);
736 if (!spawn->dead) {
737 alg = spawn->alg;
738 if (!crypto_mod_get(alg)) {
739 target = crypto_alg_get(alg);
740 shoot = true;
741 alg = ERR_PTR(-EAGAIN);
742 }
743 }
744 up_read(&crypto_alg_sem);
745
746 if (shoot) {
747 crypto_shoot_alg(target);
748 crypto_alg_put(target);
749 }
750
751 return alg;
752}
753
754struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
755 u32 mask)
756{
757 struct crypto_alg *alg;
758 struct crypto_tfm *tfm;
759
760 alg = crypto_spawn_alg(spawn);
761 if (IS_ERR(alg))
762 return ERR_CAST(alg);
763
764 tfm = ERR_PTR(-EINVAL);
765 if (unlikely((alg->cra_flags ^ type) & mask))
766 goto out_put_alg;
767
768 tfm = __crypto_alloc_tfm(alg, type, mask);
769 if (IS_ERR(tfm))
770 goto out_put_alg;
771
772 return tfm;
773
774out_put_alg:
775 crypto_mod_put(alg);
776 return tfm;
777}
778EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
779
780void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
781{
782 struct crypto_alg *alg;
783 struct crypto_tfm *tfm;
784
785 alg = crypto_spawn_alg(spawn);
786 if (IS_ERR(alg))
787 return ERR_CAST(alg);
788
789 tfm = crypto_create_tfm(alg, spawn->frontend);
790 if (IS_ERR(tfm))
791 goto out_put_alg;
792
793 return tfm;
794
795out_put_alg:
796 crypto_mod_put(alg);
797 return tfm;
798}
799EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
800
801int crypto_register_notifier(struct notifier_block *nb)
802{
803 return blocking_notifier_chain_register(&crypto_chain, nb);
804}
805EXPORT_SYMBOL_GPL(crypto_register_notifier);
806
807int crypto_unregister_notifier(struct notifier_block *nb)
808{
809 return blocking_notifier_chain_unregister(&crypto_chain, nb);
810}
811EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
812
813struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
814{
815 struct rtattr *rta = tb[0];
816 struct crypto_attr_type *algt;
817
818 if (!rta)
819 return ERR_PTR(-ENOENT);
820 if (RTA_PAYLOAD(rta) < sizeof(*algt))
821 return ERR_PTR(-EINVAL);
822 if (rta->rta_type != CRYPTOA_TYPE)
823 return ERR_PTR(-EINVAL);
824
825 algt = RTA_DATA(rta);
826
827 return algt;
828}
829EXPORT_SYMBOL_GPL(crypto_get_attr_type);
830
831/**
832 * crypto_check_attr_type() - check algorithm type and compute inherited mask
833 * @tb: the template parameters
834 * @type: the algorithm type the template would be instantiated as
835 * @mask_ret: (output) the mask that should be passed to crypto_grab_*()
836 * to restrict the flags of any inner algorithms
837 *
838 * Validate that the algorithm type the user requested is compatible with the
839 * one the template would actually be instantiated as. E.g., if the user is
840 * doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because
841 * the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm.
842 *
843 * Also compute the mask to use to restrict the flags of any inner algorithms.
844 *
845 * Return: 0 on success; -errno on failure
846 */
847int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret)
848{
849 struct crypto_attr_type *algt;
850
851 algt = crypto_get_attr_type(tb);
852 if (IS_ERR(algt))
853 return PTR_ERR(algt);
854
855 if ((algt->type ^ type) & algt->mask)
856 return -EINVAL;
857
858 *mask_ret = crypto_algt_inherited_mask(algt);
859 return 0;
860}
861EXPORT_SYMBOL_GPL(crypto_check_attr_type);
862
863const char *crypto_attr_alg_name(struct rtattr *rta)
864{
865 struct crypto_attr_alg *alga;
866
867 if (!rta)
868 return ERR_PTR(-ENOENT);
869 if (RTA_PAYLOAD(rta) < sizeof(*alga))
870 return ERR_PTR(-EINVAL);
871 if (rta->rta_type != CRYPTOA_ALG)
872 return ERR_PTR(-EINVAL);
873
874 alga = RTA_DATA(rta);
875 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
876
877 return alga->name;
878}
879EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
880
881int crypto_inst_setname(struct crypto_instance *inst, const char *name,
882 struct crypto_alg *alg)
883{
884 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
885 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
886 return -ENAMETOOLONG;
887
888 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
889 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
890 return -ENAMETOOLONG;
891
892 return 0;
893}
894EXPORT_SYMBOL_GPL(crypto_inst_setname);
895
896void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
897{
898 INIT_LIST_HEAD(&queue->list);
899 queue->backlog = &queue->list;
900 queue->qlen = 0;
901 queue->max_qlen = max_qlen;
902}
903EXPORT_SYMBOL_GPL(crypto_init_queue);
904
905int crypto_enqueue_request(struct crypto_queue *queue,
906 struct crypto_async_request *request)
907{
908 int err = -EINPROGRESS;
909
910 if (unlikely(queue->qlen >= queue->max_qlen)) {
911 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
912 err = -ENOSPC;
913 goto out;
914 }
915 err = -EBUSY;
916 if (queue->backlog == &queue->list)
917 queue->backlog = &request->list;
918 }
919
920 queue->qlen++;
921 list_add_tail(&request->list, &queue->list);
922
923out:
924 return err;
925}
926EXPORT_SYMBOL_GPL(crypto_enqueue_request);
927
928void crypto_enqueue_request_head(struct crypto_queue *queue,
929 struct crypto_async_request *request)
930{
931 if (unlikely(queue->qlen >= queue->max_qlen))
932 queue->backlog = queue->backlog->prev;
933
934 queue->qlen++;
935 list_add(&request->list, &queue->list);
936}
937EXPORT_SYMBOL_GPL(crypto_enqueue_request_head);
938
939struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
940{
941 struct list_head *request;
942
943 if (unlikely(!queue->qlen))
944 return NULL;
945
946 queue->qlen--;
947
948 if (queue->backlog != &queue->list)
949 queue->backlog = queue->backlog->next;
950
951 request = queue->list.next;
952 list_del(request);
953
954 return list_entry(request, struct crypto_async_request, list);
955}
956EXPORT_SYMBOL_GPL(crypto_dequeue_request);
957
958static inline void crypto_inc_byte(u8 *a, unsigned int size)
959{
960 u8 *b = (a + size);
961 u8 c;
962
963 for (; size; size--) {
964 c = *--b + 1;
965 *b = c;
966 if (c)
967 break;
968 }
969}
970
971void crypto_inc(u8 *a, unsigned int size)
972{
973 __be32 *b = (__be32 *)(a + size);
974 u32 c;
975
976 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
977 IS_ALIGNED((unsigned long)b, __alignof__(*b)))
978 for (; size >= 4; size -= 4) {
979 c = be32_to_cpu(*--b) + 1;
980 *b = cpu_to_be32(c);
981 if (likely(c))
982 return;
983 }
984
985 crypto_inc_byte(a, size);
986}
987EXPORT_SYMBOL_GPL(crypto_inc);
988
989unsigned int crypto_alg_extsize(struct crypto_alg *alg)
990{
991 return alg->cra_ctxsize +
992 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
993}
994EXPORT_SYMBOL_GPL(crypto_alg_extsize);
995
996int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
997 u32 type, u32 mask)
998{
999 int ret = 0;
1000 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1001
1002 if (!IS_ERR(alg)) {
1003 crypto_mod_put(alg);
1004 ret = 1;
1005 }
1006
1007 return ret;
1008}
1009EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1010
1011static void __init crypto_start_tests(void)
1012{
1013 if (!IS_BUILTIN(CONFIG_CRYPTO_ALGAPI))
1014 return;
1015
1016 if (IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS))
1017 return;
1018
1019 set_crypto_boot_test_finished();
1020
1021 for (;;) {
1022 struct crypto_larval *larval = NULL;
1023 struct crypto_alg *q;
1024
1025 down_write(&crypto_alg_sem);
1026
1027 list_for_each_entry(q, &crypto_alg_list, cra_list) {
1028 struct crypto_larval *l;
1029
1030 if (!crypto_is_larval(q))
1031 continue;
1032
1033 l = (void *)q;
1034
1035 if (!crypto_is_test_larval(l))
1036 continue;
1037
1038 if (l->test_started)
1039 continue;
1040
1041 l->test_started = true;
1042 larval = l;
1043 crypto_schedule_test(larval);
1044 break;
1045 }
1046
1047 up_write(&crypto_alg_sem);
1048
1049 if (!larval)
1050 break;
1051 }
1052}
1053
1054static int __init crypto_algapi_init(void)
1055{
1056 crypto_init_proc();
1057 crypto_start_tests();
1058 return 0;
1059}
1060
1061static void __exit crypto_algapi_exit(void)
1062{
1063 crypto_exit_proc();
1064}
1065
1066/*
1067 * We run this at late_initcall so that all the built-in algorithms
1068 * have had a chance to register themselves first.
1069 */
1070late_initcall(crypto_algapi_init);
1071module_exit(crypto_algapi_exit);
1072
1073MODULE_LICENSE("GPL");
1074MODULE_DESCRIPTION("Cryptographic algorithms API");
1075MODULE_SOFTDEP("pre: cryptomgr");
1/*
2 * Cryptographic API for algorithms (i.e., low-level API).
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 <linux/err.h>
14#include <linux/errno.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/list.h>
18#include <linux/module.h>
19#include <linux/rtnetlink.h>
20#include <linux/slab.h>
21#include <linux/string.h>
22
23#include "internal.h"
24
25static LIST_HEAD(crypto_template_list);
26
27static inline int crypto_set_driver_name(struct crypto_alg *alg)
28{
29 static const char suffix[] = "-generic";
30 char *driver_name = alg->cra_driver_name;
31 int len;
32
33 if (*driver_name)
34 return 0;
35
36 len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
37 if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
38 return -ENAMETOOLONG;
39
40 memcpy(driver_name + len, suffix, sizeof(suffix));
41 return 0;
42}
43
44static int crypto_check_alg(struct crypto_alg *alg)
45{
46 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
47 return -EINVAL;
48
49 if (alg->cra_blocksize > PAGE_SIZE / 8)
50 return -EINVAL;
51
52 if (alg->cra_priority < 0)
53 return -EINVAL;
54
55 return crypto_set_driver_name(alg);
56}
57
58static void crypto_destroy_instance(struct crypto_alg *alg)
59{
60 struct crypto_instance *inst = (void *)alg;
61 struct crypto_template *tmpl = inst->tmpl;
62
63 tmpl->free(inst);
64 crypto_tmpl_put(tmpl);
65}
66
67static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
68 struct list_head *stack,
69 struct list_head *top,
70 struct list_head *secondary_spawns)
71{
72 struct crypto_spawn *spawn, *n;
73
74 if (list_empty(stack))
75 return NULL;
76
77 spawn = list_first_entry(stack, struct crypto_spawn, list);
78 n = list_entry(spawn->list.next, struct crypto_spawn, list);
79
80 if (spawn->alg && &n->list != stack && !n->alg)
81 n->alg = (n->list.next == stack) ? alg :
82 &list_entry(n->list.next, struct crypto_spawn,
83 list)->inst->alg;
84
85 list_move(&spawn->list, secondary_spawns);
86
87 return &n->list == stack ? top : &n->inst->alg.cra_users;
88}
89
90static void crypto_remove_spawn(struct crypto_spawn *spawn,
91 struct list_head *list)
92{
93 struct crypto_instance *inst = spawn->inst;
94 struct crypto_template *tmpl = inst->tmpl;
95
96 if (crypto_is_dead(&inst->alg))
97 return;
98
99 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
100 if (hlist_unhashed(&inst->list))
101 return;
102
103 if (!tmpl || !crypto_tmpl_get(tmpl))
104 return;
105
106 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
107 list_move(&inst->alg.cra_list, list);
108 hlist_del(&inst->list);
109 inst->alg.cra_destroy = crypto_destroy_instance;
110
111 BUG_ON(!list_empty(&inst->alg.cra_users));
112}
113
114void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
115 struct crypto_alg *nalg)
116{
117 u32 new_type = (nalg ?: alg)->cra_flags;
118 struct crypto_spawn *spawn, *n;
119 LIST_HEAD(secondary_spawns);
120 struct list_head *spawns;
121 LIST_HEAD(stack);
122 LIST_HEAD(top);
123
124 spawns = &alg->cra_users;
125 list_for_each_entry_safe(spawn, n, spawns, list) {
126 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
127 continue;
128
129 list_move(&spawn->list, &top);
130 }
131
132 spawns = ⊤
133 do {
134 while (!list_empty(spawns)) {
135 struct crypto_instance *inst;
136
137 spawn = list_first_entry(spawns, struct crypto_spawn,
138 list);
139 inst = spawn->inst;
140
141 BUG_ON(&inst->alg == alg);
142
143 list_move(&spawn->list, &stack);
144
145 if (&inst->alg == nalg)
146 break;
147
148 spawn->alg = NULL;
149 spawns = &inst->alg.cra_users;
150 }
151 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
152 &secondary_spawns)));
153
154 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
155 if (spawn->alg)
156 list_move(&spawn->list, &spawn->alg->cra_users);
157 else
158 crypto_remove_spawn(spawn, list);
159 }
160}
161EXPORT_SYMBOL_GPL(crypto_remove_spawns);
162
163static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
164{
165 struct crypto_alg *q;
166 struct crypto_larval *larval;
167 int ret = -EAGAIN;
168
169 if (crypto_is_dead(alg))
170 goto err;
171
172 INIT_LIST_HEAD(&alg->cra_users);
173
174 /* No cheating! */
175 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
176
177 ret = -EEXIST;
178
179 atomic_set(&alg->cra_refcnt, 1);
180 list_for_each_entry(q, &crypto_alg_list, cra_list) {
181 if (q == alg)
182 goto err;
183
184 if (crypto_is_moribund(q))
185 continue;
186
187 if (crypto_is_larval(q)) {
188 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
189 goto err;
190 continue;
191 }
192
193 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
194 !strcmp(q->cra_name, alg->cra_driver_name))
195 goto err;
196 }
197
198 larval = crypto_larval_alloc(alg->cra_name,
199 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
200 if (IS_ERR(larval))
201 goto out;
202
203 ret = -ENOENT;
204 larval->adult = crypto_mod_get(alg);
205 if (!larval->adult)
206 goto free_larval;
207
208 atomic_set(&larval->alg.cra_refcnt, 1);
209 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
210 CRYPTO_MAX_ALG_NAME);
211 larval->alg.cra_priority = alg->cra_priority;
212
213 list_add(&alg->cra_list, &crypto_alg_list);
214 list_add(&larval->alg.cra_list, &crypto_alg_list);
215
216out:
217 return larval;
218
219free_larval:
220 kfree(larval);
221err:
222 larval = ERR_PTR(ret);
223 goto out;
224}
225
226void crypto_alg_tested(const char *name, int err)
227{
228 struct crypto_larval *test;
229 struct crypto_alg *alg;
230 struct crypto_alg *q;
231 LIST_HEAD(list);
232
233 down_write(&crypto_alg_sem);
234 list_for_each_entry(q, &crypto_alg_list, cra_list) {
235 if (crypto_is_moribund(q) || !crypto_is_larval(q))
236 continue;
237
238 test = (struct crypto_larval *)q;
239
240 if (!strcmp(q->cra_driver_name, name))
241 goto found;
242 }
243
244 printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
245 goto unlock;
246
247found:
248 q->cra_flags |= CRYPTO_ALG_DEAD;
249 alg = test->adult;
250 if (err || list_empty(&alg->cra_list))
251 goto complete;
252
253 alg->cra_flags |= CRYPTO_ALG_TESTED;
254
255 list_for_each_entry(q, &crypto_alg_list, cra_list) {
256 if (q == alg)
257 continue;
258
259 if (crypto_is_moribund(q))
260 continue;
261
262 if (crypto_is_larval(q)) {
263 struct crypto_larval *larval = (void *)q;
264
265 /*
266 * Check to see if either our generic name or
267 * specific name can satisfy the name requested
268 * by the larval entry q.
269 */
270 if (strcmp(alg->cra_name, q->cra_name) &&
271 strcmp(alg->cra_driver_name, q->cra_name))
272 continue;
273
274 if (larval->adult)
275 continue;
276 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
277 continue;
278 if (!crypto_mod_get(alg))
279 continue;
280
281 larval->adult = alg;
282 continue;
283 }
284
285 if (strcmp(alg->cra_name, q->cra_name))
286 continue;
287
288 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
289 q->cra_priority > alg->cra_priority)
290 continue;
291
292 crypto_remove_spawns(q, &list, alg);
293 }
294
295complete:
296 complete_all(&test->completion);
297
298unlock:
299 up_write(&crypto_alg_sem);
300
301 crypto_remove_final(&list);
302}
303EXPORT_SYMBOL_GPL(crypto_alg_tested);
304
305void crypto_remove_final(struct list_head *list)
306{
307 struct crypto_alg *alg;
308 struct crypto_alg *n;
309
310 list_for_each_entry_safe(alg, n, list, cra_list) {
311 list_del_init(&alg->cra_list);
312 crypto_alg_put(alg);
313 }
314}
315EXPORT_SYMBOL_GPL(crypto_remove_final);
316
317static void crypto_wait_for_test(struct crypto_larval *larval)
318{
319 int err;
320
321 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
322 if (err != NOTIFY_STOP) {
323 if (WARN_ON(err != NOTIFY_DONE))
324 goto out;
325 crypto_alg_tested(larval->alg.cra_driver_name, 0);
326 }
327
328 err = wait_for_completion_interruptible(&larval->completion);
329 WARN_ON(err);
330
331out:
332 crypto_larval_kill(&larval->alg);
333}
334
335int crypto_register_alg(struct crypto_alg *alg)
336{
337 struct crypto_larval *larval;
338 int err;
339
340 err = crypto_check_alg(alg);
341 if (err)
342 return err;
343
344 down_write(&crypto_alg_sem);
345 larval = __crypto_register_alg(alg);
346 up_write(&crypto_alg_sem);
347
348 if (IS_ERR(larval))
349 return PTR_ERR(larval);
350
351 crypto_wait_for_test(larval);
352 return 0;
353}
354EXPORT_SYMBOL_GPL(crypto_register_alg);
355
356static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
357{
358 if (unlikely(list_empty(&alg->cra_list)))
359 return -ENOENT;
360
361 alg->cra_flags |= CRYPTO_ALG_DEAD;
362
363 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
364 list_del_init(&alg->cra_list);
365 crypto_remove_spawns(alg, list, NULL);
366
367 return 0;
368}
369
370int crypto_unregister_alg(struct crypto_alg *alg)
371{
372 int ret;
373 LIST_HEAD(list);
374
375 down_write(&crypto_alg_sem);
376 ret = crypto_remove_alg(alg, &list);
377 up_write(&crypto_alg_sem);
378
379 if (ret)
380 return ret;
381
382 BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
383 if (alg->cra_destroy)
384 alg->cra_destroy(alg);
385
386 crypto_remove_final(&list);
387 return 0;
388}
389EXPORT_SYMBOL_GPL(crypto_unregister_alg);
390
391int crypto_register_algs(struct crypto_alg *algs, int count)
392{
393 int i, ret;
394
395 for (i = 0; i < count; i++) {
396 ret = crypto_register_alg(&algs[i]);
397 if (ret)
398 goto err;
399 }
400
401 return 0;
402
403err:
404 for (--i; i >= 0; --i)
405 crypto_unregister_alg(&algs[i]);
406
407 return ret;
408}
409EXPORT_SYMBOL_GPL(crypto_register_algs);
410
411int crypto_unregister_algs(struct crypto_alg *algs, int count)
412{
413 int i, ret;
414
415 for (i = 0; i < count; i++) {
416 ret = crypto_unregister_alg(&algs[i]);
417 if (ret)
418 pr_err("Failed to unregister %s %s: %d\n",
419 algs[i].cra_driver_name, algs[i].cra_name, ret);
420 }
421
422 return 0;
423}
424EXPORT_SYMBOL_GPL(crypto_unregister_algs);
425
426int crypto_register_template(struct crypto_template *tmpl)
427{
428 struct crypto_template *q;
429 int err = -EEXIST;
430
431 down_write(&crypto_alg_sem);
432
433 list_for_each_entry(q, &crypto_template_list, list) {
434 if (q == tmpl)
435 goto out;
436 }
437
438 list_add(&tmpl->list, &crypto_template_list);
439 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
440 err = 0;
441out:
442 up_write(&crypto_alg_sem);
443 return err;
444}
445EXPORT_SYMBOL_GPL(crypto_register_template);
446
447void crypto_unregister_template(struct crypto_template *tmpl)
448{
449 struct crypto_instance *inst;
450 struct hlist_node *n;
451 struct hlist_head *list;
452 LIST_HEAD(users);
453
454 down_write(&crypto_alg_sem);
455
456 BUG_ON(list_empty(&tmpl->list));
457 list_del_init(&tmpl->list);
458
459 list = &tmpl->instances;
460 hlist_for_each_entry(inst, list, list) {
461 int err = crypto_remove_alg(&inst->alg, &users);
462 BUG_ON(err);
463 }
464
465 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
466
467 up_write(&crypto_alg_sem);
468
469 hlist_for_each_entry_safe(inst, n, list, list) {
470 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
471 tmpl->free(inst);
472 }
473 crypto_remove_final(&users);
474}
475EXPORT_SYMBOL_GPL(crypto_unregister_template);
476
477static struct crypto_template *__crypto_lookup_template(const char *name)
478{
479 struct crypto_template *q, *tmpl = NULL;
480
481 down_read(&crypto_alg_sem);
482 list_for_each_entry(q, &crypto_template_list, list) {
483 if (strcmp(q->name, name))
484 continue;
485 if (unlikely(!crypto_tmpl_get(q)))
486 continue;
487
488 tmpl = q;
489 break;
490 }
491 up_read(&crypto_alg_sem);
492
493 return tmpl;
494}
495
496struct crypto_template *crypto_lookup_template(const char *name)
497{
498 return try_then_request_module(__crypto_lookup_template(name), "%s",
499 name);
500}
501EXPORT_SYMBOL_GPL(crypto_lookup_template);
502
503int crypto_register_instance(struct crypto_template *tmpl,
504 struct crypto_instance *inst)
505{
506 struct crypto_larval *larval;
507 int err;
508
509 err = crypto_check_alg(&inst->alg);
510 if (err)
511 goto err;
512
513 inst->alg.cra_module = tmpl->module;
514 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
515
516 down_write(&crypto_alg_sem);
517
518 larval = __crypto_register_alg(&inst->alg);
519 if (IS_ERR(larval))
520 goto unlock;
521
522 hlist_add_head(&inst->list, &tmpl->instances);
523 inst->tmpl = tmpl;
524
525unlock:
526 up_write(&crypto_alg_sem);
527
528 err = PTR_ERR(larval);
529 if (IS_ERR(larval))
530 goto err;
531
532 crypto_wait_for_test(larval);
533 err = 0;
534
535err:
536 return err;
537}
538EXPORT_SYMBOL_GPL(crypto_register_instance);
539
540int crypto_unregister_instance(struct crypto_alg *alg)
541{
542 int err;
543 struct crypto_instance *inst = (void *)alg;
544 struct crypto_template *tmpl = inst->tmpl;
545 LIST_HEAD(users);
546
547 if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
548 return -EINVAL;
549
550 BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
551
552 down_write(&crypto_alg_sem);
553
554 hlist_del_init(&inst->list);
555 err = crypto_remove_alg(alg, &users);
556
557 up_write(&crypto_alg_sem);
558
559 if (err)
560 return err;
561
562 tmpl->free(inst);
563 crypto_remove_final(&users);
564
565 return 0;
566}
567EXPORT_SYMBOL_GPL(crypto_unregister_instance);
568
569int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
570 struct crypto_instance *inst, u32 mask)
571{
572 int err = -EAGAIN;
573
574 spawn->inst = inst;
575 spawn->mask = mask;
576
577 down_write(&crypto_alg_sem);
578 if (!crypto_is_moribund(alg)) {
579 list_add(&spawn->list, &alg->cra_users);
580 spawn->alg = alg;
581 err = 0;
582 }
583 up_write(&crypto_alg_sem);
584
585 return err;
586}
587EXPORT_SYMBOL_GPL(crypto_init_spawn);
588
589int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
590 struct crypto_instance *inst,
591 const struct crypto_type *frontend)
592{
593 int err = -EINVAL;
594
595 if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
596 goto out;
597
598 spawn->frontend = frontend;
599 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
600
601out:
602 return err;
603}
604EXPORT_SYMBOL_GPL(crypto_init_spawn2);
605
606void crypto_drop_spawn(struct crypto_spawn *spawn)
607{
608 if (!spawn->alg)
609 return;
610
611 down_write(&crypto_alg_sem);
612 list_del(&spawn->list);
613 up_write(&crypto_alg_sem);
614}
615EXPORT_SYMBOL_GPL(crypto_drop_spawn);
616
617static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
618{
619 struct crypto_alg *alg;
620 struct crypto_alg *alg2;
621
622 down_read(&crypto_alg_sem);
623 alg = spawn->alg;
624 alg2 = alg;
625 if (alg2)
626 alg2 = crypto_mod_get(alg2);
627 up_read(&crypto_alg_sem);
628
629 if (!alg2) {
630 if (alg)
631 crypto_shoot_alg(alg);
632 return ERR_PTR(-EAGAIN);
633 }
634
635 return alg;
636}
637
638struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
639 u32 mask)
640{
641 struct crypto_alg *alg;
642 struct crypto_tfm *tfm;
643
644 alg = crypto_spawn_alg(spawn);
645 if (IS_ERR(alg))
646 return ERR_CAST(alg);
647
648 tfm = ERR_PTR(-EINVAL);
649 if (unlikely((alg->cra_flags ^ type) & mask))
650 goto out_put_alg;
651
652 tfm = __crypto_alloc_tfm(alg, type, mask);
653 if (IS_ERR(tfm))
654 goto out_put_alg;
655
656 return tfm;
657
658out_put_alg:
659 crypto_mod_put(alg);
660 return tfm;
661}
662EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
663
664void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
665{
666 struct crypto_alg *alg;
667 struct crypto_tfm *tfm;
668
669 alg = crypto_spawn_alg(spawn);
670 if (IS_ERR(alg))
671 return ERR_CAST(alg);
672
673 tfm = crypto_create_tfm(alg, spawn->frontend);
674 if (IS_ERR(tfm))
675 goto out_put_alg;
676
677 return tfm;
678
679out_put_alg:
680 crypto_mod_put(alg);
681 return tfm;
682}
683EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
684
685int crypto_register_notifier(struct notifier_block *nb)
686{
687 return blocking_notifier_chain_register(&crypto_chain, nb);
688}
689EXPORT_SYMBOL_GPL(crypto_register_notifier);
690
691int crypto_unregister_notifier(struct notifier_block *nb)
692{
693 return blocking_notifier_chain_unregister(&crypto_chain, nb);
694}
695EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
696
697struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
698{
699 struct rtattr *rta = tb[0];
700 struct crypto_attr_type *algt;
701
702 if (!rta)
703 return ERR_PTR(-ENOENT);
704 if (RTA_PAYLOAD(rta) < sizeof(*algt))
705 return ERR_PTR(-EINVAL);
706 if (rta->rta_type != CRYPTOA_TYPE)
707 return ERR_PTR(-EINVAL);
708
709 algt = RTA_DATA(rta);
710
711 return algt;
712}
713EXPORT_SYMBOL_GPL(crypto_get_attr_type);
714
715int crypto_check_attr_type(struct rtattr **tb, u32 type)
716{
717 struct crypto_attr_type *algt;
718
719 algt = crypto_get_attr_type(tb);
720 if (IS_ERR(algt))
721 return PTR_ERR(algt);
722
723 if ((algt->type ^ type) & algt->mask)
724 return -EINVAL;
725
726 return 0;
727}
728EXPORT_SYMBOL_GPL(crypto_check_attr_type);
729
730const char *crypto_attr_alg_name(struct rtattr *rta)
731{
732 struct crypto_attr_alg *alga;
733
734 if (!rta)
735 return ERR_PTR(-ENOENT);
736 if (RTA_PAYLOAD(rta) < sizeof(*alga))
737 return ERR_PTR(-EINVAL);
738 if (rta->rta_type != CRYPTOA_ALG)
739 return ERR_PTR(-EINVAL);
740
741 alga = RTA_DATA(rta);
742 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
743
744 return alga->name;
745}
746EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
747
748struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
749 const struct crypto_type *frontend,
750 u32 type, u32 mask)
751{
752 const char *name;
753
754 name = crypto_attr_alg_name(rta);
755 if (IS_ERR(name))
756 return ERR_CAST(name);
757
758 return crypto_find_alg(name, frontend, type, mask);
759}
760EXPORT_SYMBOL_GPL(crypto_attr_alg2);
761
762int crypto_attr_u32(struct rtattr *rta, u32 *num)
763{
764 struct crypto_attr_u32 *nu32;
765
766 if (!rta)
767 return -ENOENT;
768 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
769 return -EINVAL;
770 if (rta->rta_type != CRYPTOA_U32)
771 return -EINVAL;
772
773 nu32 = RTA_DATA(rta);
774 *num = nu32->num;
775
776 return 0;
777}
778EXPORT_SYMBOL_GPL(crypto_attr_u32);
779
780void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
781 unsigned int head)
782{
783 struct crypto_instance *inst;
784 char *p;
785 int err;
786
787 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
788 GFP_KERNEL);
789 if (!p)
790 return ERR_PTR(-ENOMEM);
791
792 inst = (void *)(p + head);
793
794 err = -ENAMETOOLONG;
795 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
796 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
797 goto err_free_inst;
798
799 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
800 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
801 goto err_free_inst;
802
803 return p;
804
805err_free_inst:
806 kfree(p);
807 return ERR_PTR(err);
808}
809EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
810
811struct crypto_instance *crypto_alloc_instance(const char *name,
812 struct crypto_alg *alg)
813{
814 struct crypto_instance *inst;
815 struct crypto_spawn *spawn;
816 int err;
817
818 inst = crypto_alloc_instance2(name, alg, 0);
819 if (IS_ERR(inst))
820 goto out;
821
822 spawn = crypto_instance_ctx(inst);
823 err = crypto_init_spawn(spawn, alg, inst,
824 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
825
826 if (err)
827 goto err_free_inst;
828
829 return inst;
830
831err_free_inst:
832 kfree(inst);
833 inst = ERR_PTR(err);
834
835out:
836 return inst;
837}
838EXPORT_SYMBOL_GPL(crypto_alloc_instance);
839
840void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
841{
842 INIT_LIST_HEAD(&queue->list);
843 queue->backlog = &queue->list;
844 queue->qlen = 0;
845 queue->max_qlen = max_qlen;
846}
847EXPORT_SYMBOL_GPL(crypto_init_queue);
848
849int crypto_enqueue_request(struct crypto_queue *queue,
850 struct crypto_async_request *request)
851{
852 int err = -EINPROGRESS;
853
854 if (unlikely(queue->qlen >= queue->max_qlen)) {
855 err = -EBUSY;
856 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
857 goto out;
858 if (queue->backlog == &queue->list)
859 queue->backlog = &request->list;
860 }
861
862 queue->qlen++;
863 list_add_tail(&request->list, &queue->list);
864
865out:
866 return err;
867}
868EXPORT_SYMBOL_GPL(crypto_enqueue_request);
869
870void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
871{
872 struct list_head *request;
873
874 if (unlikely(!queue->qlen))
875 return NULL;
876
877 queue->qlen--;
878
879 if (queue->backlog != &queue->list)
880 queue->backlog = queue->backlog->next;
881
882 request = queue->list.next;
883 list_del(request);
884
885 return (char *)list_entry(request, struct crypto_async_request, list) -
886 offset;
887}
888EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
889
890struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
891{
892 return __crypto_dequeue_request(queue, 0);
893}
894EXPORT_SYMBOL_GPL(crypto_dequeue_request);
895
896int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
897{
898 struct crypto_async_request *req;
899
900 list_for_each_entry(req, &queue->list, list) {
901 if (req->tfm == tfm)
902 return 1;
903 }
904
905 return 0;
906}
907EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
908
909static inline void crypto_inc_byte(u8 *a, unsigned int size)
910{
911 u8 *b = (a + size);
912 u8 c;
913
914 for (; size; size--) {
915 c = *--b + 1;
916 *b = c;
917 if (c)
918 break;
919 }
920}
921
922void crypto_inc(u8 *a, unsigned int size)
923{
924 __be32 *b = (__be32 *)(a + size);
925 u32 c;
926
927 for (; size >= 4; size -= 4) {
928 c = be32_to_cpu(*--b) + 1;
929 *b = cpu_to_be32(c);
930 if (c)
931 return;
932 }
933
934 crypto_inc_byte(a, size);
935}
936EXPORT_SYMBOL_GPL(crypto_inc);
937
938static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
939{
940 for (; size; size--)
941 *a++ ^= *b++;
942}
943
944void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
945{
946 u32 *a = (u32 *)dst;
947 u32 *b = (u32 *)src;
948
949 for (; size >= 4; size -= 4)
950 *a++ ^= *b++;
951
952 crypto_xor_byte((u8 *)a, (u8 *)b, size);
953}
954EXPORT_SYMBOL_GPL(crypto_xor);
955
956static int __init crypto_algapi_init(void)
957{
958 crypto_init_proc();
959 return 0;
960}
961
962static void __exit crypto_algapi_exit(void)
963{
964 crypto_exit_proc();
965}
966
967module_init(crypto_algapi_init);
968module_exit(crypto_algapi_exit);
969
970MODULE_LICENSE("GPL");
971MODULE_DESCRIPTION("Cryptographic algorithms API");