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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
20#include "internal.h"
21
22static LIST_HEAD(crypto_template_list);
23
24static inline void crypto_check_module_sig(struct module *mod)
25{
26 if (fips_enabled && mod && !module_sig_ok(mod))
27 panic("Module %s signature verification failed in FIPS mode\n",
28 module_name(mod));
29}
30
31static int crypto_check_alg(struct crypto_alg *alg)
32{
33 crypto_check_module_sig(alg->cra_module);
34
35 if (!alg->cra_name[0] || !alg->cra_driver_name[0])
36 return -EINVAL;
37
38 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
39 return -EINVAL;
40
41 /* General maximums for all algs. */
42 if (alg->cra_alignmask > MAX_ALGAPI_ALIGNMASK)
43 return -EINVAL;
44
45 if (alg->cra_blocksize > MAX_ALGAPI_BLOCKSIZE)
46 return -EINVAL;
47
48 /* Lower maximums for specific alg types. */
49 if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
50 CRYPTO_ALG_TYPE_CIPHER) {
51 if (alg->cra_alignmask > MAX_CIPHER_ALIGNMASK)
52 return -EINVAL;
53
54 if (alg->cra_blocksize > MAX_CIPHER_BLOCKSIZE)
55 return -EINVAL;
56 }
57
58 if (alg->cra_priority < 0)
59 return -EINVAL;
60
61 refcount_set(&alg->cra_refcnt, 1);
62
63 return 0;
64}
65
66static void crypto_free_instance(struct crypto_instance *inst)
67{
68 inst->alg.cra_type->free(inst);
69}
70
71static void crypto_destroy_instance(struct crypto_alg *alg)
72{
73 struct crypto_instance *inst = (void *)alg;
74 struct crypto_template *tmpl = inst->tmpl;
75
76 crypto_free_instance(inst);
77 crypto_tmpl_put(tmpl);
78}
79
80/*
81 * This function adds a spawn to the list secondary_spawns which
82 * will be used at the end of crypto_remove_spawns to unregister
83 * instances, unless the spawn happens to be one that is depended
84 * on by the new algorithm (nalg in crypto_remove_spawns).
85 *
86 * This function is also responsible for resurrecting any algorithms
87 * in the dependency chain of nalg by unsetting n->dead.
88 */
89static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
90 struct list_head *stack,
91 struct list_head *top,
92 struct list_head *secondary_spawns)
93{
94 struct crypto_spawn *spawn, *n;
95
96 spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
97 if (!spawn)
98 return NULL;
99
100 n = list_prev_entry(spawn, list);
101 list_move(&spawn->list, secondary_spawns);
102
103 if (list_is_last(&n->list, stack))
104 return top;
105
106 n = list_next_entry(n, list);
107 if (!spawn->dead)
108 n->dead = false;
109
110 return &n->inst->alg.cra_users;
111}
112
113static void crypto_remove_instance(struct crypto_instance *inst,
114 struct list_head *list)
115{
116 struct crypto_template *tmpl = inst->tmpl;
117
118 if (crypto_is_dead(&inst->alg))
119 return;
120
121 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
122
123 if (!tmpl || !crypto_tmpl_get(tmpl))
124 return;
125
126 list_move(&inst->alg.cra_list, list);
127 hlist_del(&inst->list);
128 inst->alg.cra_destroy = crypto_destroy_instance;
129
130 BUG_ON(!list_empty(&inst->alg.cra_users));
131}
132
133/*
134 * Given an algorithm alg, remove all algorithms that depend on it
135 * through spawns. If nalg is not null, then exempt any algorithms
136 * that is depended on by nalg. This is useful when nalg itself
137 * depends on alg.
138 */
139void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
140 struct crypto_alg *nalg)
141{
142 u32 new_type = (nalg ?: alg)->cra_flags;
143 struct crypto_spawn *spawn, *n;
144 LIST_HEAD(secondary_spawns);
145 struct list_head *spawns;
146 LIST_HEAD(stack);
147 LIST_HEAD(top);
148
149 spawns = &alg->cra_users;
150 list_for_each_entry_safe(spawn, n, spawns, list) {
151 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
152 continue;
153
154 list_move(&spawn->list, &top);
155 }
156
157 /*
158 * Perform a depth-first walk starting from alg through
159 * the cra_users tree. The list stack records the path
160 * from alg to the current spawn.
161 */
162 spawns = ⊤
163 do {
164 while (!list_empty(spawns)) {
165 struct crypto_instance *inst;
166
167 spawn = list_first_entry(spawns, struct crypto_spawn,
168 list);
169 inst = spawn->inst;
170
171 list_move(&spawn->list, &stack);
172 spawn->dead = !spawn->registered || &inst->alg != nalg;
173
174 if (!spawn->registered)
175 break;
176
177 BUG_ON(&inst->alg == alg);
178
179 if (&inst->alg == nalg)
180 break;
181
182 spawns = &inst->alg.cra_users;
183
184 /*
185 * Even if spawn->registered is true, the
186 * instance itself may still be unregistered.
187 * This is because it may have failed during
188 * registration. Therefore we still need to
189 * make the following test.
190 *
191 * We may encounter an unregistered instance here, since
192 * an instance's spawns are set up prior to the instance
193 * being registered. An unregistered instance will have
194 * NULL ->cra_users.next, since ->cra_users isn't
195 * properly initialized until registration. But an
196 * unregistered instance cannot have any users, so treat
197 * it the same as ->cra_users being empty.
198 */
199 if (spawns->next == NULL)
200 break;
201 }
202 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
203 &secondary_spawns)));
204
205 /*
206 * Remove all instances that are marked as dead. Also
207 * complete the resurrection of the others by moving them
208 * back to the cra_users list.
209 */
210 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
211 if (!spawn->dead)
212 list_move(&spawn->list, &spawn->alg->cra_users);
213 else if (spawn->registered)
214 crypto_remove_instance(spawn->inst, list);
215 }
216}
217EXPORT_SYMBOL_GPL(crypto_remove_spawns);
218
219static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
220{
221 struct crypto_alg *q;
222 struct crypto_larval *larval;
223 int ret = -EAGAIN;
224
225 if (crypto_is_dead(alg))
226 goto err;
227
228 INIT_LIST_HEAD(&alg->cra_users);
229
230 /* No cheating! */
231 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
232
233 ret = -EEXIST;
234
235 list_for_each_entry(q, &crypto_alg_list, cra_list) {
236 if (q == alg)
237 goto err;
238
239 if (crypto_is_moribund(q))
240 continue;
241
242 if (crypto_is_larval(q)) {
243 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
244 goto err;
245 continue;
246 }
247
248 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
249 !strcmp(q->cra_name, alg->cra_driver_name))
250 goto err;
251 }
252
253 larval = crypto_larval_alloc(alg->cra_name,
254 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
255 if (IS_ERR(larval))
256 goto out;
257
258 ret = -ENOENT;
259 larval->adult = crypto_mod_get(alg);
260 if (!larval->adult)
261 goto free_larval;
262
263 refcount_set(&larval->alg.cra_refcnt, 1);
264 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
265 CRYPTO_MAX_ALG_NAME);
266 larval->alg.cra_priority = alg->cra_priority;
267
268 list_add(&alg->cra_list, &crypto_alg_list);
269 list_add(&larval->alg.cra_list, &crypto_alg_list);
270
271 crypto_stats_init(alg);
272
273out:
274 return larval;
275
276free_larval:
277 kfree(larval);
278err:
279 larval = ERR_PTR(ret);
280 goto out;
281}
282
283void crypto_alg_tested(const char *name, int err)
284{
285 struct crypto_larval *test;
286 struct crypto_alg *alg;
287 struct crypto_alg *q;
288 LIST_HEAD(list);
289 bool best;
290
291 down_write(&crypto_alg_sem);
292 list_for_each_entry(q, &crypto_alg_list, cra_list) {
293 if (crypto_is_moribund(q) || !crypto_is_larval(q))
294 continue;
295
296 test = (struct crypto_larval *)q;
297
298 if (!strcmp(q->cra_driver_name, name))
299 goto found;
300 }
301
302 pr_err("alg: Unexpected test result for %s: %d\n", name, err);
303 goto unlock;
304
305found:
306 q->cra_flags |= CRYPTO_ALG_DEAD;
307 alg = test->adult;
308 if (err || list_empty(&alg->cra_list))
309 goto complete;
310
311 alg->cra_flags |= CRYPTO_ALG_TESTED;
312
313 /* Only satisfy larval waiters if we are the best. */
314 best = true;
315 list_for_each_entry(q, &crypto_alg_list, cra_list) {
316 if (crypto_is_moribund(q) || !crypto_is_larval(q))
317 continue;
318
319 if (strcmp(alg->cra_name, q->cra_name))
320 continue;
321
322 if (q->cra_priority > alg->cra_priority) {
323 best = false;
324 break;
325 }
326 }
327
328 list_for_each_entry(q, &crypto_alg_list, cra_list) {
329 if (q == alg)
330 continue;
331
332 if (crypto_is_moribund(q))
333 continue;
334
335 if (crypto_is_larval(q)) {
336 struct crypto_larval *larval = (void *)q;
337
338 /*
339 * Check to see if either our generic name or
340 * specific name can satisfy the name requested
341 * by the larval entry q.
342 */
343 if (strcmp(alg->cra_name, q->cra_name) &&
344 strcmp(alg->cra_driver_name, q->cra_name))
345 continue;
346
347 if (larval->adult)
348 continue;
349 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
350 continue;
351
352 if (best && crypto_mod_get(alg))
353 larval->adult = alg;
354 else
355 larval->adult = ERR_PTR(-EAGAIN);
356
357 continue;
358 }
359
360 if (strcmp(alg->cra_name, q->cra_name))
361 continue;
362
363 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
364 q->cra_priority > alg->cra_priority)
365 continue;
366
367 crypto_remove_spawns(q, &list, alg);
368 }
369
370complete:
371 complete_all(&test->completion);
372
373unlock:
374 up_write(&crypto_alg_sem);
375
376 crypto_remove_final(&list);
377}
378EXPORT_SYMBOL_GPL(crypto_alg_tested);
379
380void crypto_remove_final(struct list_head *list)
381{
382 struct crypto_alg *alg;
383 struct crypto_alg *n;
384
385 list_for_each_entry_safe(alg, n, list, cra_list) {
386 list_del_init(&alg->cra_list);
387 crypto_alg_put(alg);
388 }
389}
390EXPORT_SYMBOL_GPL(crypto_remove_final);
391
392static void crypto_wait_for_test(struct crypto_larval *larval)
393{
394 int err;
395
396 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
397 if (err != NOTIFY_STOP) {
398 if (WARN_ON(err != NOTIFY_DONE))
399 goto out;
400 crypto_alg_tested(larval->alg.cra_driver_name, 0);
401 }
402
403 err = wait_for_completion_killable(&larval->completion);
404 WARN_ON(err);
405 if (!err)
406 crypto_notify(CRYPTO_MSG_ALG_LOADED, larval);
407
408out:
409 crypto_larval_kill(&larval->alg);
410}
411
412int crypto_register_alg(struct crypto_alg *alg)
413{
414 struct crypto_larval *larval;
415 int err;
416
417 alg->cra_flags &= ~CRYPTO_ALG_DEAD;
418 err = crypto_check_alg(alg);
419 if (err)
420 return err;
421
422 down_write(&crypto_alg_sem);
423 larval = __crypto_register_alg(alg);
424 up_write(&crypto_alg_sem);
425
426 if (IS_ERR(larval))
427 return PTR_ERR(larval);
428
429 crypto_wait_for_test(larval);
430 return 0;
431}
432EXPORT_SYMBOL_GPL(crypto_register_alg);
433
434static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
435{
436 if (unlikely(list_empty(&alg->cra_list)))
437 return -ENOENT;
438
439 alg->cra_flags |= CRYPTO_ALG_DEAD;
440
441 list_del_init(&alg->cra_list);
442 crypto_remove_spawns(alg, list, NULL);
443
444 return 0;
445}
446
447void crypto_unregister_alg(struct crypto_alg *alg)
448{
449 int ret;
450 LIST_HEAD(list);
451
452 down_write(&crypto_alg_sem);
453 ret = crypto_remove_alg(alg, &list);
454 up_write(&crypto_alg_sem);
455
456 if (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name))
457 return;
458
459 BUG_ON(refcount_read(&alg->cra_refcnt) != 1);
460 if (alg->cra_destroy)
461 alg->cra_destroy(alg);
462
463 crypto_remove_final(&list);
464}
465EXPORT_SYMBOL_GPL(crypto_unregister_alg);
466
467int crypto_register_algs(struct crypto_alg *algs, int count)
468{
469 int i, ret;
470
471 for (i = 0; i < count; i++) {
472 ret = crypto_register_alg(&algs[i]);
473 if (ret)
474 goto err;
475 }
476
477 return 0;
478
479err:
480 for (--i; i >= 0; --i)
481 crypto_unregister_alg(&algs[i]);
482
483 return ret;
484}
485EXPORT_SYMBOL_GPL(crypto_register_algs);
486
487void crypto_unregister_algs(struct crypto_alg *algs, int count)
488{
489 int i;
490
491 for (i = 0; i < count; i++)
492 crypto_unregister_alg(&algs[i]);
493}
494EXPORT_SYMBOL_GPL(crypto_unregister_algs);
495
496int crypto_register_template(struct crypto_template *tmpl)
497{
498 struct crypto_template *q;
499 int err = -EEXIST;
500
501 down_write(&crypto_alg_sem);
502
503 crypto_check_module_sig(tmpl->module);
504
505 list_for_each_entry(q, &crypto_template_list, list) {
506 if (q == tmpl)
507 goto out;
508 }
509
510 list_add(&tmpl->list, &crypto_template_list);
511 err = 0;
512out:
513 up_write(&crypto_alg_sem);
514 return err;
515}
516EXPORT_SYMBOL_GPL(crypto_register_template);
517
518int crypto_register_templates(struct crypto_template *tmpls, int count)
519{
520 int i, err;
521
522 for (i = 0; i < count; i++) {
523 err = crypto_register_template(&tmpls[i]);
524 if (err)
525 goto out;
526 }
527 return 0;
528
529out:
530 for (--i; i >= 0; --i)
531 crypto_unregister_template(&tmpls[i]);
532 return err;
533}
534EXPORT_SYMBOL_GPL(crypto_register_templates);
535
536void crypto_unregister_template(struct crypto_template *tmpl)
537{
538 struct crypto_instance *inst;
539 struct hlist_node *n;
540 struct hlist_head *list;
541 LIST_HEAD(users);
542
543 down_write(&crypto_alg_sem);
544
545 BUG_ON(list_empty(&tmpl->list));
546 list_del_init(&tmpl->list);
547
548 list = &tmpl->instances;
549 hlist_for_each_entry(inst, list, list) {
550 int err = crypto_remove_alg(&inst->alg, &users);
551
552 BUG_ON(err);
553 }
554
555 up_write(&crypto_alg_sem);
556
557 hlist_for_each_entry_safe(inst, n, list, list) {
558 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
559 crypto_free_instance(inst);
560 }
561 crypto_remove_final(&users);
562}
563EXPORT_SYMBOL_GPL(crypto_unregister_template);
564
565void crypto_unregister_templates(struct crypto_template *tmpls, int count)
566{
567 int i;
568
569 for (i = count - 1; i >= 0; --i)
570 crypto_unregister_template(&tmpls[i]);
571}
572EXPORT_SYMBOL_GPL(crypto_unregister_templates);
573
574static struct crypto_template *__crypto_lookup_template(const char *name)
575{
576 struct crypto_template *q, *tmpl = NULL;
577
578 down_read(&crypto_alg_sem);
579 list_for_each_entry(q, &crypto_template_list, list) {
580 if (strcmp(q->name, name))
581 continue;
582 if (unlikely(!crypto_tmpl_get(q)))
583 continue;
584
585 tmpl = q;
586 break;
587 }
588 up_read(&crypto_alg_sem);
589
590 return tmpl;
591}
592
593struct crypto_template *crypto_lookup_template(const char *name)
594{
595 return try_then_request_module(__crypto_lookup_template(name),
596 "crypto-%s", name);
597}
598EXPORT_SYMBOL_GPL(crypto_lookup_template);
599
600int crypto_register_instance(struct crypto_template *tmpl,
601 struct crypto_instance *inst)
602{
603 struct crypto_larval *larval;
604 struct crypto_spawn *spawn;
605 int err;
606
607 err = crypto_check_alg(&inst->alg);
608 if (err)
609 return err;
610
611 inst->alg.cra_module = tmpl->module;
612 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
613
614 down_write(&crypto_alg_sem);
615
616 larval = ERR_PTR(-EAGAIN);
617 for (spawn = inst->spawns; spawn;) {
618 struct crypto_spawn *next;
619
620 if (spawn->dead)
621 goto unlock;
622
623 next = spawn->next;
624 spawn->inst = inst;
625 spawn->registered = true;
626
627 crypto_mod_put(spawn->alg);
628
629 spawn = next;
630 }
631
632 larval = __crypto_register_alg(&inst->alg);
633 if (IS_ERR(larval))
634 goto unlock;
635
636 hlist_add_head(&inst->list, &tmpl->instances);
637 inst->tmpl = tmpl;
638
639unlock:
640 up_write(&crypto_alg_sem);
641
642 err = PTR_ERR(larval);
643 if (IS_ERR(larval))
644 goto err;
645
646 crypto_wait_for_test(larval);
647 err = 0;
648
649err:
650 return err;
651}
652EXPORT_SYMBOL_GPL(crypto_register_instance);
653
654void crypto_unregister_instance(struct crypto_instance *inst)
655{
656 LIST_HEAD(list);
657
658 down_write(&crypto_alg_sem);
659
660 crypto_remove_spawns(&inst->alg, &list, NULL);
661 crypto_remove_instance(inst, &list);
662
663 up_write(&crypto_alg_sem);
664
665 crypto_remove_final(&list);
666}
667EXPORT_SYMBOL_GPL(crypto_unregister_instance);
668
669int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
670 const char *name, u32 type, u32 mask)
671{
672 struct crypto_alg *alg;
673 int err = -EAGAIN;
674
675 if (WARN_ON_ONCE(inst == NULL))
676 return -EINVAL;
677
678 /* Allow the result of crypto_attr_alg_name() to be passed directly */
679 if (IS_ERR(name))
680 return PTR_ERR(name);
681
682 alg = crypto_find_alg(name, spawn->frontend, type, mask);
683 if (IS_ERR(alg))
684 return PTR_ERR(alg);
685
686 down_write(&crypto_alg_sem);
687 if (!crypto_is_moribund(alg)) {
688 list_add(&spawn->list, &alg->cra_users);
689 spawn->alg = alg;
690 spawn->mask = mask;
691 spawn->next = inst->spawns;
692 inst->spawns = spawn;
693 inst->alg.cra_flags |=
694 (alg->cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
695 err = 0;
696 }
697 up_write(&crypto_alg_sem);
698 if (err)
699 crypto_mod_put(alg);
700 return err;
701}
702EXPORT_SYMBOL_GPL(crypto_grab_spawn);
703
704void crypto_drop_spawn(struct crypto_spawn *spawn)
705{
706 if (!spawn->alg) /* not yet initialized? */
707 return;
708
709 down_write(&crypto_alg_sem);
710 if (!spawn->dead)
711 list_del(&spawn->list);
712 up_write(&crypto_alg_sem);
713
714 if (!spawn->registered)
715 crypto_mod_put(spawn->alg);
716}
717EXPORT_SYMBOL_GPL(crypto_drop_spawn);
718
719static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
720{
721 struct crypto_alg *alg = ERR_PTR(-EAGAIN);
722 struct crypto_alg *target;
723 bool shoot = false;
724
725 down_read(&crypto_alg_sem);
726 if (!spawn->dead) {
727 alg = spawn->alg;
728 if (!crypto_mod_get(alg)) {
729 target = crypto_alg_get(alg);
730 shoot = true;
731 alg = ERR_PTR(-EAGAIN);
732 }
733 }
734 up_read(&crypto_alg_sem);
735
736 if (shoot) {
737 crypto_shoot_alg(target);
738 crypto_alg_put(target);
739 }
740
741 return alg;
742}
743
744struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
745 u32 mask)
746{
747 struct crypto_alg *alg;
748 struct crypto_tfm *tfm;
749
750 alg = crypto_spawn_alg(spawn);
751 if (IS_ERR(alg))
752 return ERR_CAST(alg);
753
754 tfm = ERR_PTR(-EINVAL);
755 if (unlikely((alg->cra_flags ^ type) & mask))
756 goto out_put_alg;
757
758 tfm = __crypto_alloc_tfm(alg, type, mask);
759 if (IS_ERR(tfm))
760 goto out_put_alg;
761
762 return tfm;
763
764out_put_alg:
765 crypto_mod_put(alg);
766 return tfm;
767}
768EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
769
770void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
771{
772 struct crypto_alg *alg;
773 struct crypto_tfm *tfm;
774
775 alg = crypto_spawn_alg(spawn);
776 if (IS_ERR(alg))
777 return ERR_CAST(alg);
778
779 tfm = crypto_create_tfm(alg, spawn->frontend);
780 if (IS_ERR(tfm))
781 goto out_put_alg;
782
783 return tfm;
784
785out_put_alg:
786 crypto_mod_put(alg);
787 return tfm;
788}
789EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
790
791int crypto_register_notifier(struct notifier_block *nb)
792{
793 return blocking_notifier_chain_register(&crypto_chain, nb);
794}
795EXPORT_SYMBOL_GPL(crypto_register_notifier);
796
797int crypto_unregister_notifier(struct notifier_block *nb)
798{
799 return blocking_notifier_chain_unregister(&crypto_chain, nb);
800}
801EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
802
803struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
804{
805 struct rtattr *rta = tb[0];
806 struct crypto_attr_type *algt;
807
808 if (!rta)
809 return ERR_PTR(-ENOENT);
810 if (RTA_PAYLOAD(rta) < sizeof(*algt))
811 return ERR_PTR(-EINVAL);
812 if (rta->rta_type != CRYPTOA_TYPE)
813 return ERR_PTR(-EINVAL);
814
815 algt = RTA_DATA(rta);
816
817 return algt;
818}
819EXPORT_SYMBOL_GPL(crypto_get_attr_type);
820
821/**
822 * crypto_check_attr_type() - check algorithm type and compute inherited mask
823 * @tb: the template parameters
824 * @type: the algorithm type the template would be instantiated as
825 * @mask_ret: (output) the mask that should be passed to crypto_grab_*()
826 * to restrict the flags of any inner algorithms
827 *
828 * Validate that the algorithm type the user requested is compatible with the
829 * one the template would actually be instantiated as. E.g., if the user is
830 * doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because
831 * the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm.
832 *
833 * Also compute the mask to use to restrict the flags of any inner algorithms.
834 *
835 * Return: 0 on success; -errno on failure
836 */
837int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret)
838{
839 struct crypto_attr_type *algt;
840
841 algt = crypto_get_attr_type(tb);
842 if (IS_ERR(algt))
843 return PTR_ERR(algt);
844
845 if ((algt->type ^ type) & algt->mask)
846 return -EINVAL;
847
848 *mask_ret = crypto_algt_inherited_mask(algt);
849 return 0;
850}
851EXPORT_SYMBOL_GPL(crypto_check_attr_type);
852
853const char *crypto_attr_alg_name(struct rtattr *rta)
854{
855 struct crypto_attr_alg *alga;
856
857 if (!rta)
858 return ERR_PTR(-ENOENT);
859 if (RTA_PAYLOAD(rta) < sizeof(*alga))
860 return ERR_PTR(-EINVAL);
861 if (rta->rta_type != CRYPTOA_ALG)
862 return ERR_PTR(-EINVAL);
863
864 alga = RTA_DATA(rta);
865 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
866
867 return alga->name;
868}
869EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
870
871int crypto_attr_u32(struct rtattr *rta, u32 *num)
872{
873 struct crypto_attr_u32 *nu32;
874
875 if (!rta)
876 return -ENOENT;
877 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
878 return -EINVAL;
879 if (rta->rta_type != CRYPTOA_U32)
880 return -EINVAL;
881
882 nu32 = RTA_DATA(rta);
883 *num = nu32->num;
884
885 return 0;
886}
887EXPORT_SYMBOL_GPL(crypto_attr_u32);
888
889int crypto_inst_setname(struct crypto_instance *inst, const char *name,
890 struct crypto_alg *alg)
891{
892 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
893 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
894 return -ENAMETOOLONG;
895
896 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
897 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
898 return -ENAMETOOLONG;
899
900 return 0;
901}
902EXPORT_SYMBOL_GPL(crypto_inst_setname);
903
904void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
905{
906 INIT_LIST_HEAD(&queue->list);
907 queue->backlog = &queue->list;
908 queue->qlen = 0;
909 queue->max_qlen = max_qlen;
910}
911EXPORT_SYMBOL_GPL(crypto_init_queue);
912
913int crypto_enqueue_request(struct crypto_queue *queue,
914 struct crypto_async_request *request)
915{
916 int err = -EINPROGRESS;
917
918 if (unlikely(queue->qlen >= queue->max_qlen)) {
919 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
920 err = -ENOSPC;
921 goto out;
922 }
923 err = -EBUSY;
924 if (queue->backlog == &queue->list)
925 queue->backlog = &request->list;
926 }
927
928 queue->qlen++;
929 list_add_tail(&request->list, &queue->list);
930
931out:
932 return err;
933}
934EXPORT_SYMBOL_GPL(crypto_enqueue_request);
935
936void crypto_enqueue_request_head(struct crypto_queue *queue,
937 struct crypto_async_request *request)
938{
939 queue->qlen++;
940 list_add(&request->list, &queue->list);
941}
942EXPORT_SYMBOL_GPL(crypto_enqueue_request_head);
943
944struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
945{
946 struct list_head *request;
947
948 if (unlikely(!queue->qlen))
949 return NULL;
950
951 queue->qlen--;
952
953 if (queue->backlog != &queue->list)
954 queue->backlog = queue->backlog->next;
955
956 request = queue->list.next;
957 list_del(request);
958
959 return list_entry(request, struct crypto_async_request, list);
960}
961EXPORT_SYMBOL_GPL(crypto_dequeue_request);
962
963static inline void crypto_inc_byte(u8 *a, unsigned int size)
964{
965 u8 *b = (a + size);
966 u8 c;
967
968 for (; size; size--) {
969 c = *--b + 1;
970 *b = c;
971 if (c)
972 break;
973 }
974}
975
976void crypto_inc(u8 *a, unsigned int size)
977{
978 __be32 *b = (__be32 *)(a + size);
979 u32 c;
980
981 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
982 IS_ALIGNED((unsigned long)b, __alignof__(*b)))
983 for (; size >= 4; size -= 4) {
984 c = be32_to_cpu(*--b) + 1;
985 *b = cpu_to_be32(c);
986 if (likely(c))
987 return;
988 }
989
990 crypto_inc_byte(a, size);
991}
992EXPORT_SYMBOL_GPL(crypto_inc);
993
994void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
995{
996 int relalign = 0;
997
998 if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
999 int size = sizeof(unsigned long);
1000 int d = (((unsigned long)dst ^ (unsigned long)src1) |
1001 ((unsigned long)dst ^ (unsigned long)src2)) &
1002 (size - 1);
1003
1004 relalign = d ? 1 << __ffs(d) : size;
1005
1006 /*
1007 * If we care about alignment, process as many bytes as
1008 * needed to advance dst and src to values whose alignments
1009 * equal their relative alignment. This will allow us to
1010 * process the remainder of the input using optimal strides.
1011 */
1012 while (((unsigned long)dst & (relalign - 1)) && len > 0) {
1013 *dst++ = *src1++ ^ *src2++;
1014 len--;
1015 }
1016 }
1017
1018 while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
1019 *(u64 *)dst = *(u64 *)src1 ^ *(u64 *)src2;
1020 dst += 8;
1021 src1 += 8;
1022 src2 += 8;
1023 len -= 8;
1024 }
1025
1026 while (len >= 4 && !(relalign & 3)) {
1027 *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
1028 dst += 4;
1029 src1 += 4;
1030 src2 += 4;
1031 len -= 4;
1032 }
1033
1034 while (len >= 2 && !(relalign & 1)) {
1035 *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
1036 dst += 2;
1037 src1 += 2;
1038 src2 += 2;
1039 len -= 2;
1040 }
1041
1042 while (len--)
1043 *dst++ = *src1++ ^ *src2++;
1044}
1045EXPORT_SYMBOL_GPL(__crypto_xor);
1046
1047unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1048{
1049 return alg->cra_ctxsize +
1050 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1051}
1052EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1053
1054int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1055 u32 type, u32 mask)
1056{
1057 int ret = 0;
1058 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1059
1060 if (!IS_ERR(alg)) {
1061 crypto_mod_put(alg);
1062 ret = 1;
1063 }
1064
1065 return ret;
1066}
1067EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1068
1069#ifdef CONFIG_CRYPTO_STATS
1070void crypto_stats_init(struct crypto_alg *alg)
1071{
1072 memset(&alg->stats, 0, sizeof(alg->stats));
1073}
1074EXPORT_SYMBOL_GPL(crypto_stats_init);
1075
1076void crypto_stats_get(struct crypto_alg *alg)
1077{
1078 crypto_alg_get(alg);
1079}
1080EXPORT_SYMBOL_GPL(crypto_stats_get);
1081
1082void crypto_stats_aead_encrypt(unsigned int cryptlen, struct crypto_alg *alg,
1083 int ret)
1084{
1085 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1086 atomic64_inc(&alg->stats.aead.err_cnt);
1087 } else {
1088 atomic64_inc(&alg->stats.aead.encrypt_cnt);
1089 atomic64_add(cryptlen, &alg->stats.aead.encrypt_tlen);
1090 }
1091 crypto_alg_put(alg);
1092}
1093EXPORT_SYMBOL_GPL(crypto_stats_aead_encrypt);
1094
1095void crypto_stats_aead_decrypt(unsigned int cryptlen, struct crypto_alg *alg,
1096 int ret)
1097{
1098 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1099 atomic64_inc(&alg->stats.aead.err_cnt);
1100 } else {
1101 atomic64_inc(&alg->stats.aead.decrypt_cnt);
1102 atomic64_add(cryptlen, &alg->stats.aead.decrypt_tlen);
1103 }
1104 crypto_alg_put(alg);
1105}
1106EXPORT_SYMBOL_GPL(crypto_stats_aead_decrypt);
1107
1108void crypto_stats_akcipher_encrypt(unsigned int src_len, int ret,
1109 struct crypto_alg *alg)
1110{
1111 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1112 atomic64_inc(&alg->stats.akcipher.err_cnt);
1113 } else {
1114 atomic64_inc(&alg->stats.akcipher.encrypt_cnt);
1115 atomic64_add(src_len, &alg->stats.akcipher.encrypt_tlen);
1116 }
1117 crypto_alg_put(alg);
1118}
1119EXPORT_SYMBOL_GPL(crypto_stats_akcipher_encrypt);
1120
1121void crypto_stats_akcipher_decrypt(unsigned int src_len, int ret,
1122 struct crypto_alg *alg)
1123{
1124 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1125 atomic64_inc(&alg->stats.akcipher.err_cnt);
1126 } else {
1127 atomic64_inc(&alg->stats.akcipher.decrypt_cnt);
1128 atomic64_add(src_len, &alg->stats.akcipher.decrypt_tlen);
1129 }
1130 crypto_alg_put(alg);
1131}
1132EXPORT_SYMBOL_GPL(crypto_stats_akcipher_decrypt);
1133
1134void crypto_stats_akcipher_sign(int ret, struct crypto_alg *alg)
1135{
1136 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1137 atomic64_inc(&alg->stats.akcipher.err_cnt);
1138 else
1139 atomic64_inc(&alg->stats.akcipher.sign_cnt);
1140 crypto_alg_put(alg);
1141}
1142EXPORT_SYMBOL_GPL(crypto_stats_akcipher_sign);
1143
1144void crypto_stats_akcipher_verify(int ret, struct crypto_alg *alg)
1145{
1146 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1147 atomic64_inc(&alg->stats.akcipher.err_cnt);
1148 else
1149 atomic64_inc(&alg->stats.akcipher.verify_cnt);
1150 crypto_alg_put(alg);
1151}
1152EXPORT_SYMBOL_GPL(crypto_stats_akcipher_verify);
1153
1154void crypto_stats_compress(unsigned int slen, int ret, struct crypto_alg *alg)
1155{
1156 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1157 atomic64_inc(&alg->stats.compress.err_cnt);
1158 } else {
1159 atomic64_inc(&alg->stats.compress.compress_cnt);
1160 atomic64_add(slen, &alg->stats.compress.compress_tlen);
1161 }
1162 crypto_alg_put(alg);
1163}
1164EXPORT_SYMBOL_GPL(crypto_stats_compress);
1165
1166void crypto_stats_decompress(unsigned int slen, int ret, struct crypto_alg *alg)
1167{
1168 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1169 atomic64_inc(&alg->stats.compress.err_cnt);
1170 } else {
1171 atomic64_inc(&alg->stats.compress.decompress_cnt);
1172 atomic64_add(slen, &alg->stats.compress.decompress_tlen);
1173 }
1174 crypto_alg_put(alg);
1175}
1176EXPORT_SYMBOL_GPL(crypto_stats_decompress);
1177
1178void crypto_stats_ahash_update(unsigned int nbytes, int ret,
1179 struct crypto_alg *alg)
1180{
1181 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1182 atomic64_inc(&alg->stats.hash.err_cnt);
1183 else
1184 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1185 crypto_alg_put(alg);
1186}
1187EXPORT_SYMBOL_GPL(crypto_stats_ahash_update);
1188
1189void crypto_stats_ahash_final(unsigned int nbytes, int ret,
1190 struct crypto_alg *alg)
1191{
1192 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1193 atomic64_inc(&alg->stats.hash.err_cnt);
1194 } else {
1195 atomic64_inc(&alg->stats.hash.hash_cnt);
1196 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1197 }
1198 crypto_alg_put(alg);
1199}
1200EXPORT_SYMBOL_GPL(crypto_stats_ahash_final);
1201
1202void crypto_stats_kpp_set_secret(struct crypto_alg *alg, int ret)
1203{
1204 if (ret)
1205 atomic64_inc(&alg->stats.kpp.err_cnt);
1206 else
1207 atomic64_inc(&alg->stats.kpp.setsecret_cnt);
1208 crypto_alg_put(alg);
1209}
1210EXPORT_SYMBOL_GPL(crypto_stats_kpp_set_secret);
1211
1212void crypto_stats_kpp_generate_public_key(struct crypto_alg *alg, int ret)
1213{
1214 if (ret)
1215 atomic64_inc(&alg->stats.kpp.err_cnt);
1216 else
1217 atomic64_inc(&alg->stats.kpp.generate_public_key_cnt);
1218 crypto_alg_put(alg);
1219}
1220EXPORT_SYMBOL_GPL(crypto_stats_kpp_generate_public_key);
1221
1222void crypto_stats_kpp_compute_shared_secret(struct crypto_alg *alg, int ret)
1223{
1224 if (ret)
1225 atomic64_inc(&alg->stats.kpp.err_cnt);
1226 else
1227 atomic64_inc(&alg->stats.kpp.compute_shared_secret_cnt);
1228 crypto_alg_put(alg);
1229}
1230EXPORT_SYMBOL_GPL(crypto_stats_kpp_compute_shared_secret);
1231
1232void crypto_stats_rng_seed(struct crypto_alg *alg, int ret)
1233{
1234 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1235 atomic64_inc(&alg->stats.rng.err_cnt);
1236 else
1237 atomic64_inc(&alg->stats.rng.seed_cnt);
1238 crypto_alg_put(alg);
1239}
1240EXPORT_SYMBOL_GPL(crypto_stats_rng_seed);
1241
1242void crypto_stats_rng_generate(struct crypto_alg *alg, unsigned int dlen,
1243 int ret)
1244{
1245 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1246 atomic64_inc(&alg->stats.rng.err_cnt);
1247 } else {
1248 atomic64_inc(&alg->stats.rng.generate_cnt);
1249 atomic64_add(dlen, &alg->stats.rng.generate_tlen);
1250 }
1251 crypto_alg_put(alg);
1252}
1253EXPORT_SYMBOL_GPL(crypto_stats_rng_generate);
1254
1255void crypto_stats_skcipher_encrypt(unsigned int cryptlen, int ret,
1256 struct crypto_alg *alg)
1257{
1258 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1259 atomic64_inc(&alg->stats.cipher.err_cnt);
1260 } else {
1261 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1262 atomic64_add(cryptlen, &alg->stats.cipher.encrypt_tlen);
1263 }
1264 crypto_alg_put(alg);
1265}
1266EXPORT_SYMBOL_GPL(crypto_stats_skcipher_encrypt);
1267
1268void crypto_stats_skcipher_decrypt(unsigned int cryptlen, int ret,
1269 struct crypto_alg *alg)
1270{
1271 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1272 atomic64_inc(&alg->stats.cipher.err_cnt);
1273 } else {
1274 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1275 atomic64_add(cryptlen, &alg->stats.cipher.decrypt_tlen);
1276 }
1277 crypto_alg_put(alg);
1278}
1279EXPORT_SYMBOL_GPL(crypto_stats_skcipher_decrypt);
1280#endif
1281
1282static int __init crypto_algapi_init(void)
1283{
1284 crypto_init_proc();
1285 return 0;
1286}
1287
1288static void __exit crypto_algapi_exit(void)
1289{
1290 crypto_exit_proc();
1291}
1292
1293module_init(crypto_algapi_init);
1294module_exit(crypto_algapi_exit);
1295
1296MODULE_LICENSE("GPL");
1297MODULE_DESCRIPTION("Cryptographic algorithms API");
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 <crypto/internal/simd.h>
10#include <linux/err.h>
11#include <linux/errno.h>
12#include <linux/fips.h>
13#include <linux/init.h>
14#include <linux/kernel.h>
15#include <linux/list.h>
16#include <linux/module.h>
17#include <linux/rtnetlink.h>
18#include <linux/slab.h>
19#include <linux/string.h>
20
21#include "internal.h"
22
23static LIST_HEAD(crypto_template_list);
24
25#ifdef CONFIG_CRYPTO_MANAGER_EXTRA_TESTS
26DEFINE_PER_CPU(bool, crypto_simd_disabled_for_test);
27EXPORT_PER_CPU_SYMBOL_GPL(crypto_simd_disabled_for_test);
28#endif
29
30static inline void crypto_check_module_sig(struct module *mod)
31{
32 if (fips_enabled && mod && !module_sig_ok(mod))
33 panic("Module %s signature verification failed in FIPS mode\n",
34 module_name(mod));
35}
36
37static int crypto_check_alg(struct crypto_alg *alg)
38{
39 crypto_check_module_sig(alg->cra_module);
40
41 if (!alg->cra_name[0] || !alg->cra_driver_name[0])
42 return -EINVAL;
43
44 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
45 return -EINVAL;
46
47 /* General maximums for all algs. */
48 if (alg->cra_alignmask > MAX_ALGAPI_ALIGNMASK)
49 return -EINVAL;
50
51 if (alg->cra_blocksize > MAX_ALGAPI_BLOCKSIZE)
52 return -EINVAL;
53
54 /* Lower maximums for specific alg types. */
55 if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
56 CRYPTO_ALG_TYPE_CIPHER) {
57 if (alg->cra_alignmask > MAX_CIPHER_ALIGNMASK)
58 return -EINVAL;
59
60 if (alg->cra_blocksize > MAX_CIPHER_BLOCKSIZE)
61 return -EINVAL;
62 }
63
64 if (alg->cra_priority < 0)
65 return -EINVAL;
66
67 refcount_set(&alg->cra_refcnt, 1);
68
69 return 0;
70}
71
72static void crypto_free_instance(struct crypto_instance *inst)
73{
74 inst->alg.cra_type->free(inst);
75}
76
77static void crypto_destroy_instance(struct crypto_alg *alg)
78{
79 struct crypto_instance *inst = (void *)alg;
80 struct crypto_template *tmpl = inst->tmpl;
81
82 crypto_free_instance(inst);
83 crypto_tmpl_put(tmpl);
84}
85
86/*
87 * This function adds a spawn to the list secondary_spawns which
88 * will be used at the end of crypto_remove_spawns to unregister
89 * instances, unless the spawn happens to be one that is depended
90 * on by the new algorithm (nalg in crypto_remove_spawns).
91 *
92 * This function is also responsible for resurrecting any algorithms
93 * in the dependency chain of nalg by unsetting n->dead.
94 */
95static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
96 struct list_head *stack,
97 struct list_head *top,
98 struct list_head *secondary_spawns)
99{
100 struct crypto_spawn *spawn, *n;
101
102 spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
103 if (!spawn)
104 return NULL;
105
106 n = list_prev_entry(spawn, list);
107 list_move(&spawn->list, secondary_spawns);
108
109 if (list_is_last(&n->list, stack))
110 return top;
111
112 n = list_next_entry(n, list);
113 if (!spawn->dead)
114 n->dead = false;
115
116 return &n->inst->alg.cra_users;
117}
118
119static void crypto_remove_instance(struct crypto_instance *inst,
120 struct list_head *list)
121{
122 struct crypto_template *tmpl = inst->tmpl;
123
124 if (crypto_is_dead(&inst->alg))
125 return;
126
127 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
128
129 if (!tmpl || !crypto_tmpl_get(tmpl))
130 return;
131
132 list_move(&inst->alg.cra_list, list);
133 hlist_del(&inst->list);
134 inst->alg.cra_destroy = crypto_destroy_instance;
135
136 BUG_ON(!list_empty(&inst->alg.cra_users));
137}
138
139/*
140 * Given an algorithm alg, remove all algorithms that depend on it
141 * through spawns. If nalg is not null, then exempt any algorithms
142 * that is depended on by nalg. This is useful when nalg itself
143 * depends on alg.
144 */
145void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
146 struct crypto_alg *nalg)
147{
148 u32 new_type = (nalg ?: alg)->cra_flags;
149 struct crypto_spawn *spawn, *n;
150 LIST_HEAD(secondary_spawns);
151 struct list_head *spawns;
152 LIST_HEAD(stack);
153 LIST_HEAD(top);
154
155 spawns = &alg->cra_users;
156 list_for_each_entry_safe(spawn, n, spawns, list) {
157 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
158 continue;
159
160 list_move(&spawn->list, &top);
161 }
162
163 /*
164 * Perform a depth-first walk starting from alg through
165 * the cra_users tree. The list stack records the path
166 * from alg to the current spawn.
167 */
168 spawns = ⊤
169 do {
170 while (!list_empty(spawns)) {
171 struct crypto_instance *inst;
172
173 spawn = list_first_entry(spawns, struct crypto_spawn,
174 list);
175 inst = spawn->inst;
176
177 list_move(&spawn->list, &stack);
178 spawn->dead = !spawn->registered || &inst->alg != nalg;
179
180 if (!spawn->registered)
181 break;
182
183 BUG_ON(&inst->alg == alg);
184
185 if (&inst->alg == nalg)
186 break;
187
188 spawns = &inst->alg.cra_users;
189
190 /*
191 * Even if spawn->registered is true, the
192 * instance itself may still be unregistered.
193 * This is because it may have failed during
194 * registration. Therefore we still need to
195 * make the following test.
196 *
197 * We may encounter an unregistered instance here, since
198 * an instance's spawns are set up prior to the instance
199 * being registered. An unregistered instance will have
200 * NULL ->cra_users.next, since ->cra_users isn't
201 * properly initialized until registration. But an
202 * unregistered instance cannot have any users, so treat
203 * it the same as ->cra_users being empty.
204 */
205 if (spawns->next == NULL)
206 break;
207 }
208 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
209 &secondary_spawns)));
210
211 /*
212 * Remove all instances that are marked as dead. Also
213 * complete the resurrection of the others by moving them
214 * back to the cra_users list.
215 */
216 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
217 if (!spawn->dead)
218 list_move(&spawn->list, &spawn->alg->cra_users);
219 else if (spawn->registered)
220 crypto_remove_instance(spawn->inst, list);
221 }
222}
223EXPORT_SYMBOL_GPL(crypto_remove_spawns);
224
225static void crypto_alg_finish_registration(struct crypto_alg *alg,
226 bool fulfill_requests,
227 struct list_head *algs_to_put)
228{
229 struct crypto_alg *q;
230
231 list_for_each_entry(q, &crypto_alg_list, cra_list) {
232 if (q == alg)
233 continue;
234
235 if (crypto_is_moribund(q))
236 continue;
237
238 if (crypto_is_larval(q)) {
239 struct crypto_larval *larval = (void *)q;
240
241 /*
242 * Check to see if either our generic name or
243 * specific name can satisfy the name requested
244 * by the larval entry q.
245 */
246 if (strcmp(alg->cra_name, q->cra_name) &&
247 strcmp(alg->cra_driver_name, q->cra_name))
248 continue;
249
250 if (larval->adult)
251 continue;
252 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
253 continue;
254
255 if (fulfill_requests && crypto_mod_get(alg))
256 larval->adult = alg;
257 else
258 larval->adult = ERR_PTR(-EAGAIN);
259
260 continue;
261 }
262
263 if (strcmp(alg->cra_name, q->cra_name))
264 continue;
265
266 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
267 q->cra_priority > alg->cra_priority)
268 continue;
269
270 crypto_remove_spawns(q, algs_to_put, alg);
271 }
272
273 crypto_notify(CRYPTO_MSG_ALG_LOADED, alg);
274}
275
276static struct crypto_larval *crypto_alloc_test_larval(struct crypto_alg *alg)
277{
278 struct crypto_larval *larval;
279
280 if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER) ||
281 IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS) ||
282 (alg->cra_flags & CRYPTO_ALG_INTERNAL))
283 return NULL; /* No self-test needed */
284
285 larval = crypto_larval_alloc(alg->cra_name,
286 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
287 if (IS_ERR(larval))
288 return larval;
289
290 larval->adult = crypto_mod_get(alg);
291 if (!larval->adult) {
292 kfree(larval);
293 return ERR_PTR(-ENOENT);
294 }
295
296 refcount_set(&larval->alg.cra_refcnt, 1);
297 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
298 CRYPTO_MAX_ALG_NAME);
299 larval->alg.cra_priority = alg->cra_priority;
300
301 return larval;
302}
303
304static struct crypto_larval *
305__crypto_register_alg(struct crypto_alg *alg, struct list_head *algs_to_put)
306{
307 struct crypto_alg *q;
308 struct crypto_larval *larval;
309 int ret = -EAGAIN;
310
311 if (crypto_is_dead(alg))
312 goto err;
313
314 INIT_LIST_HEAD(&alg->cra_users);
315
316 ret = -EEXIST;
317
318 list_for_each_entry(q, &crypto_alg_list, cra_list) {
319 if (q == alg)
320 goto err;
321
322 if (crypto_is_moribund(q))
323 continue;
324
325 if (crypto_is_larval(q)) {
326 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
327 goto err;
328 continue;
329 }
330
331 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
332 !strcmp(q->cra_name, alg->cra_driver_name))
333 goto err;
334 }
335
336 larval = crypto_alloc_test_larval(alg);
337 if (IS_ERR(larval))
338 goto out;
339
340 list_add(&alg->cra_list, &crypto_alg_list);
341
342 crypto_stats_init(alg);
343
344 if (larval) {
345 /* No cheating! */
346 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
347
348 list_add(&larval->alg.cra_list, &crypto_alg_list);
349 } else {
350 alg->cra_flags |= CRYPTO_ALG_TESTED;
351 crypto_alg_finish_registration(alg, true, algs_to_put);
352 }
353
354out:
355 return larval;
356
357err:
358 larval = ERR_PTR(ret);
359 goto out;
360}
361
362void crypto_alg_tested(const char *name, int err)
363{
364 struct crypto_larval *test;
365 struct crypto_alg *alg;
366 struct crypto_alg *q;
367 LIST_HEAD(list);
368 bool best;
369
370 down_write(&crypto_alg_sem);
371 list_for_each_entry(q, &crypto_alg_list, cra_list) {
372 if (crypto_is_moribund(q) || !crypto_is_larval(q))
373 continue;
374
375 test = (struct crypto_larval *)q;
376
377 if (!strcmp(q->cra_driver_name, name))
378 goto found;
379 }
380
381 pr_err("alg: Unexpected test result for %s: %d\n", name, err);
382 goto unlock;
383
384found:
385 q->cra_flags |= CRYPTO_ALG_DEAD;
386 alg = test->adult;
387
388 if (list_empty(&alg->cra_list))
389 goto complete;
390
391 if (err == -ECANCELED)
392 alg->cra_flags |= CRYPTO_ALG_FIPS_INTERNAL;
393 else if (err)
394 goto complete;
395 else
396 alg->cra_flags &= ~CRYPTO_ALG_FIPS_INTERNAL;
397
398 alg->cra_flags |= CRYPTO_ALG_TESTED;
399
400 /*
401 * If a higher-priority implementation of the same algorithm is
402 * currently being tested, then don't fulfill request larvals.
403 */
404 best = true;
405 list_for_each_entry(q, &crypto_alg_list, cra_list) {
406 if (crypto_is_moribund(q) || !crypto_is_larval(q))
407 continue;
408
409 if (strcmp(alg->cra_name, q->cra_name))
410 continue;
411
412 if (q->cra_priority > alg->cra_priority) {
413 best = false;
414 break;
415 }
416 }
417
418 crypto_alg_finish_registration(alg, best, &list);
419
420complete:
421 complete_all(&test->completion);
422
423unlock:
424 up_write(&crypto_alg_sem);
425
426 crypto_remove_final(&list);
427}
428EXPORT_SYMBOL_GPL(crypto_alg_tested);
429
430void crypto_remove_final(struct list_head *list)
431{
432 struct crypto_alg *alg;
433 struct crypto_alg *n;
434
435 list_for_each_entry_safe(alg, n, list, cra_list) {
436 list_del_init(&alg->cra_list);
437 crypto_alg_put(alg);
438 }
439}
440EXPORT_SYMBOL_GPL(crypto_remove_final);
441
442int crypto_register_alg(struct crypto_alg *alg)
443{
444 struct crypto_larval *larval;
445 LIST_HEAD(algs_to_put);
446 bool test_started = false;
447 int err;
448
449 alg->cra_flags &= ~CRYPTO_ALG_DEAD;
450 err = crypto_check_alg(alg);
451 if (err)
452 return err;
453
454 down_write(&crypto_alg_sem);
455 larval = __crypto_register_alg(alg, &algs_to_put);
456 if (!IS_ERR_OR_NULL(larval)) {
457 test_started = crypto_boot_test_finished();
458 larval->test_started = test_started;
459 }
460 up_write(&crypto_alg_sem);
461
462 if (IS_ERR(larval))
463 return PTR_ERR(larval);
464 if (test_started)
465 crypto_wait_for_test(larval);
466 crypto_remove_final(&algs_to_put);
467 return 0;
468}
469EXPORT_SYMBOL_GPL(crypto_register_alg);
470
471static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
472{
473 if (unlikely(list_empty(&alg->cra_list)))
474 return -ENOENT;
475
476 alg->cra_flags |= CRYPTO_ALG_DEAD;
477
478 list_del_init(&alg->cra_list);
479 crypto_remove_spawns(alg, list, NULL);
480
481 return 0;
482}
483
484void crypto_unregister_alg(struct crypto_alg *alg)
485{
486 int ret;
487 LIST_HEAD(list);
488
489 down_write(&crypto_alg_sem);
490 ret = crypto_remove_alg(alg, &list);
491 up_write(&crypto_alg_sem);
492
493 if (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name))
494 return;
495
496 BUG_ON(refcount_read(&alg->cra_refcnt) != 1);
497 if (alg->cra_destroy)
498 alg->cra_destroy(alg);
499
500 crypto_remove_final(&list);
501}
502EXPORT_SYMBOL_GPL(crypto_unregister_alg);
503
504int crypto_register_algs(struct crypto_alg *algs, int count)
505{
506 int i, ret;
507
508 for (i = 0; i < count; i++) {
509 ret = crypto_register_alg(&algs[i]);
510 if (ret)
511 goto err;
512 }
513
514 return 0;
515
516err:
517 for (--i; i >= 0; --i)
518 crypto_unregister_alg(&algs[i]);
519
520 return ret;
521}
522EXPORT_SYMBOL_GPL(crypto_register_algs);
523
524void crypto_unregister_algs(struct crypto_alg *algs, int count)
525{
526 int i;
527
528 for (i = 0; i < count; i++)
529 crypto_unregister_alg(&algs[i]);
530}
531EXPORT_SYMBOL_GPL(crypto_unregister_algs);
532
533int crypto_register_template(struct crypto_template *tmpl)
534{
535 struct crypto_template *q;
536 int err = -EEXIST;
537
538 down_write(&crypto_alg_sem);
539
540 crypto_check_module_sig(tmpl->module);
541
542 list_for_each_entry(q, &crypto_template_list, list) {
543 if (q == tmpl)
544 goto out;
545 }
546
547 list_add(&tmpl->list, &crypto_template_list);
548 err = 0;
549out:
550 up_write(&crypto_alg_sem);
551 return err;
552}
553EXPORT_SYMBOL_GPL(crypto_register_template);
554
555int crypto_register_templates(struct crypto_template *tmpls, int count)
556{
557 int i, err;
558
559 for (i = 0; i < count; i++) {
560 err = crypto_register_template(&tmpls[i]);
561 if (err)
562 goto out;
563 }
564 return 0;
565
566out:
567 for (--i; i >= 0; --i)
568 crypto_unregister_template(&tmpls[i]);
569 return err;
570}
571EXPORT_SYMBOL_GPL(crypto_register_templates);
572
573void crypto_unregister_template(struct crypto_template *tmpl)
574{
575 struct crypto_instance *inst;
576 struct hlist_node *n;
577 struct hlist_head *list;
578 LIST_HEAD(users);
579
580 down_write(&crypto_alg_sem);
581
582 BUG_ON(list_empty(&tmpl->list));
583 list_del_init(&tmpl->list);
584
585 list = &tmpl->instances;
586 hlist_for_each_entry(inst, list, list) {
587 int err = crypto_remove_alg(&inst->alg, &users);
588
589 BUG_ON(err);
590 }
591
592 up_write(&crypto_alg_sem);
593
594 hlist_for_each_entry_safe(inst, n, list, list) {
595 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
596 crypto_free_instance(inst);
597 }
598 crypto_remove_final(&users);
599}
600EXPORT_SYMBOL_GPL(crypto_unregister_template);
601
602void crypto_unregister_templates(struct crypto_template *tmpls, int count)
603{
604 int i;
605
606 for (i = count - 1; i >= 0; --i)
607 crypto_unregister_template(&tmpls[i]);
608}
609EXPORT_SYMBOL_GPL(crypto_unregister_templates);
610
611static struct crypto_template *__crypto_lookup_template(const char *name)
612{
613 struct crypto_template *q, *tmpl = NULL;
614
615 down_read(&crypto_alg_sem);
616 list_for_each_entry(q, &crypto_template_list, list) {
617 if (strcmp(q->name, name))
618 continue;
619 if (unlikely(!crypto_tmpl_get(q)))
620 continue;
621
622 tmpl = q;
623 break;
624 }
625 up_read(&crypto_alg_sem);
626
627 return tmpl;
628}
629
630struct crypto_template *crypto_lookup_template(const char *name)
631{
632 return try_then_request_module(__crypto_lookup_template(name),
633 "crypto-%s", name);
634}
635EXPORT_SYMBOL_GPL(crypto_lookup_template);
636
637int crypto_register_instance(struct crypto_template *tmpl,
638 struct crypto_instance *inst)
639{
640 struct crypto_larval *larval;
641 struct crypto_spawn *spawn;
642 u32 fips_internal = 0;
643 LIST_HEAD(algs_to_put);
644 int err;
645
646 err = crypto_check_alg(&inst->alg);
647 if (err)
648 return err;
649
650 inst->alg.cra_module = tmpl->module;
651 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
652
653 down_write(&crypto_alg_sem);
654
655 larval = ERR_PTR(-EAGAIN);
656 for (spawn = inst->spawns; spawn;) {
657 struct crypto_spawn *next;
658
659 if (spawn->dead)
660 goto unlock;
661
662 next = spawn->next;
663 spawn->inst = inst;
664 spawn->registered = true;
665
666 fips_internal |= spawn->alg->cra_flags;
667
668 crypto_mod_put(spawn->alg);
669
670 spawn = next;
671 }
672
673 inst->alg.cra_flags |= (fips_internal & CRYPTO_ALG_FIPS_INTERNAL);
674
675 larval = __crypto_register_alg(&inst->alg, &algs_to_put);
676 if (IS_ERR(larval))
677 goto unlock;
678 else if (larval)
679 larval->test_started = true;
680
681 hlist_add_head(&inst->list, &tmpl->instances);
682 inst->tmpl = tmpl;
683
684unlock:
685 up_write(&crypto_alg_sem);
686
687 if (IS_ERR(larval))
688 return PTR_ERR(larval);
689 if (larval)
690 crypto_wait_for_test(larval);
691 crypto_remove_final(&algs_to_put);
692 return 0;
693}
694EXPORT_SYMBOL_GPL(crypto_register_instance);
695
696void crypto_unregister_instance(struct crypto_instance *inst)
697{
698 LIST_HEAD(list);
699
700 down_write(&crypto_alg_sem);
701
702 crypto_remove_spawns(&inst->alg, &list, NULL);
703 crypto_remove_instance(inst, &list);
704
705 up_write(&crypto_alg_sem);
706
707 crypto_remove_final(&list);
708}
709EXPORT_SYMBOL_GPL(crypto_unregister_instance);
710
711int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
712 const char *name, u32 type, u32 mask)
713{
714 struct crypto_alg *alg;
715 int err = -EAGAIN;
716
717 if (WARN_ON_ONCE(inst == NULL))
718 return -EINVAL;
719
720 /* Allow the result of crypto_attr_alg_name() to be passed directly */
721 if (IS_ERR(name))
722 return PTR_ERR(name);
723
724 alg = crypto_find_alg(name, spawn->frontend,
725 type | CRYPTO_ALG_FIPS_INTERNAL, mask);
726 if (IS_ERR(alg))
727 return PTR_ERR(alg);
728
729 down_write(&crypto_alg_sem);
730 if (!crypto_is_moribund(alg)) {
731 list_add(&spawn->list, &alg->cra_users);
732 spawn->alg = alg;
733 spawn->mask = mask;
734 spawn->next = inst->spawns;
735 inst->spawns = spawn;
736 inst->alg.cra_flags |=
737 (alg->cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
738 err = 0;
739 }
740 up_write(&crypto_alg_sem);
741 if (err)
742 crypto_mod_put(alg);
743 return err;
744}
745EXPORT_SYMBOL_GPL(crypto_grab_spawn);
746
747void crypto_drop_spawn(struct crypto_spawn *spawn)
748{
749 if (!spawn->alg) /* not yet initialized? */
750 return;
751
752 down_write(&crypto_alg_sem);
753 if (!spawn->dead)
754 list_del(&spawn->list);
755 up_write(&crypto_alg_sem);
756
757 if (!spawn->registered)
758 crypto_mod_put(spawn->alg);
759}
760EXPORT_SYMBOL_GPL(crypto_drop_spawn);
761
762static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
763{
764 struct crypto_alg *alg = ERR_PTR(-EAGAIN);
765 struct crypto_alg *target;
766 bool shoot = false;
767
768 down_read(&crypto_alg_sem);
769 if (!spawn->dead) {
770 alg = spawn->alg;
771 if (!crypto_mod_get(alg)) {
772 target = crypto_alg_get(alg);
773 shoot = true;
774 alg = ERR_PTR(-EAGAIN);
775 }
776 }
777 up_read(&crypto_alg_sem);
778
779 if (shoot) {
780 crypto_shoot_alg(target);
781 crypto_alg_put(target);
782 }
783
784 return alg;
785}
786
787struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
788 u32 mask)
789{
790 struct crypto_alg *alg;
791 struct crypto_tfm *tfm;
792
793 alg = crypto_spawn_alg(spawn);
794 if (IS_ERR(alg))
795 return ERR_CAST(alg);
796
797 tfm = ERR_PTR(-EINVAL);
798 if (unlikely((alg->cra_flags ^ type) & mask))
799 goto out_put_alg;
800
801 tfm = __crypto_alloc_tfm(alg, type, mask);
802 if (IS_ERR(tfm))
803 goto out_put_alg;
804
805 return tfm;
806
807out_put_alg:
808 crypto_mod_put(alg);
809 return tfm;
810}
811EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
812
813void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
814{
815 struct crypto_alg *alg;
816 struct crypto_tfm *tfm;
817
818 alg = crypto_spawn_alg(spawn);
819 if (IS_ERR(alg))
820 return ERR_CAST(alg);
821
822 tfm = crypto_create_tfm(alg, spawn->frontend);
823 if (IS_ERR(tfm))
824 goto out_put_alg;
825
826 return tfm;
827
828out_put_alg:
829 crypto_mod_put(alg);
830 return tfm;
831}
832EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
833
834int crypto_register_notifier(struct notifier_block *nb)
835{
836 return blocking_notifier_chain_register(&crypto_chain, nb);
837}
838EXPORT_SYMBOL_GPL(crypto_register_notifier);
839
840int crypto_unregister_notifier(struct notifier_block *nb)
841{
842 return blocking_notifier_chain_unregister(&crypto_chain, nb);
843}
844EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
845
846struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
847{
848 struct rtattr *rta = tb[0];
849 struct crypto_attr_type *algt;
850
851 if (!rta)
852 return ERR_PTR(-ENOENT);
853 if (RTA_PAYLOAD(rta) < sizeof(*algt))
854 return ERR_PTR(-EINVAL);
855 if (rta->rta_type != CRYPTOA_TYPE)
856 return ERR_PTR(-EINVAL);
857
858 algt = RTA_DATA(rta);
859
860 return algt;
861}
862EXPORT_SYMBOL_GPL(crypto_get_attr_type);
863
864/**
865 * crypto_check_attr_type() - check algorithm type and compute inherited mask
866 * @tb: the template parameters
867 * @type: the algorithm type the template would be instantiated as
868 * @mask_ret: (output) the mask that should be passed to crypto_grab_*()
869 * to restrict the flags of any inner algorithms
870 *
871 * Validate that the algorithm type the user requested is compatible with the
872 * one the template would actually be instantiated as. E.g., if the user is
873 * doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because
874 * the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm.
875 *
876 * Also compute the mask to use to restrict the flags of any inner algorithms.
877 *
878 * Return: 0 on success; -errno on failure
879 */
880int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret)
881{
882 struct crypto_attr_type *algt;
883
884 algt = crypto_get_attr_type(tb);
885 if (IS_ERR(algt))
886 return PTR_ERR(algt);
887
888 if ((algt->type ^ type) & algt->mask)
889 return -EINVAL;
890
891 *mask_ret = crypto_algt_inherited_mask(algt);
892 return 0;
893}
894EXPORT_SYMBOL_GPL(crypto_check_attr_type);
895
896const char *crypto_attr_alg_name(struct rtattr *rta)
897{
898 struct crypto_attr_alg *alga;
899
900 if (!rta)
901 return ERR_PTR(-ENOENT);
902 if (RTA_PAYLOAD(rta) < sizeof(*alga))
903 return ERR_PTR(-EINVAL);
904 if (rta->rta_type != CRYPTOA_ALG)
905 return ERR_PTR(-EINVAL);
906
907 alga = RTA_DATA(rta);
908 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
909
910 return alga->name;
911}
912EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
913
914int crypto_inst_setname(struct crypto_instance *inst, const char *name,
915 struct crypto_alg *alg)
916{
917 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
918 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
919 return -ENAMETOOLONG;
920
921 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
922 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
923 return -ENAMETOOLONG;
924
925 return 0;
926}
927EXPORT_SYMBOL_GPL(crypto_inst_setname);
928
929void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
930{
931 INIT_LIST_HEAD(&queue->list);
932 queue->backlog = &queue->list;
933 queue->qlen = 0;
934 queue->max_qlen = max_qlen;
935}
936EXPORT_SYMBOL_GPL(crypto_init_queue);
937
938int crypto_enqueue_request(struct crypto_queue *queue,
939 struct crypto_async_request *request)
940{
941 int err = -EINPROGRESS;
942
943 if (unlikely(queue->qlen >= queue->max_qlen)) {
944 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
945 err = -ENOSPC;
946 goto out;
947 }
948 err = -EBUSY;
949 if (queue->backlog == &queue->list)
950 queue->backlog = &request->list;
951 }
952
953 queue->qlen++;
954 list_add_tail(&request->list, &queue->list);
955
956out:
957 return err;
958}
959EXPORT_SYMBOL_GPL(crypto_enqueue_request);
960
961void crypto_enqueue_request_head(struct crypto_queue *queue,
962 struct crypto_async_request *request)
963{
964 queue->qlen++;
965 list_add(&request->list, &queue->list);
966}
967EXPORT_SYMBOL_GPL(crypto_enqueue_request_head);
968
969struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
970{
971 struct list_head *request;
972
973 if (unlikely(!queue->qlen))
974 return NULL;
975
976 queue->qlen--;
977
978 if (queue->backlog != &queue->list)
979 queue->backlog = queue->backlog->next;
980
981 request = queue->list.next;
982 list_del(request);
983
984 return list_entry(request, struct crypto_async_request, list);
985}
986EXPORT_SYMBOL_GPL(crypto_dequeue_request);
987
988static inline void crypto_inc_byte(u8 *a, unsigned int size)
989{
990 u8 *b = (a + size);
991 u8 c;
992
993 for (; size; size--) {
994 c = *--b + 1;
995 *b = c;
996 if (c)
997 break;
998 }
999}
1000
1001void crypto_inc(u8 *a, unsigned int size)
1002{
1003 __be32 *b = (__be32 *)(a + size);
1004 u32 c;
1005
1006 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
1007 IS_ALIGNED((unsigned long)b, __alignof__(*b)))
1008 for (; size >= 4; size -= 4) {
1009 c = be32_to_cpu(*--b) + 1;
1010 *b = cpu_to_be32(c);
1011 if (likely(c))
1012 return;
1013 }
1014
1015 crypto_inc_byte(a, size);
1016}
1017EXPORT_SYMBOL_GPL(crypto_inc);
1018
1019unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1020{
1021 return alg->cra_ctxsize +
1022 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1023}
1024EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1025
1026int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1027 u32 type, u32 mask)
1028{
1029 int ret = 0;
1030 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1031
1032 if (!IS_ERR(alg)) {
1033 crypto_mod_put(alg);
1034 ret = 1;
1035 }
1036
1037 return ret;
1038}
1039EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1040
1041#ifdef CONFIG_CRYPTO_STATS
1042void crypto_stats_init(struct crypto_alg *alg)
1043{
1044 memset(&alg->stats, 0, sizeof(alg->stats));
1045}
1046EXPORT_SYMBOL_GPL(crypto_stats_init);
1047
1048void crypto_stats_get(struct crypto_alg *alg)
1049{
1050 crypto_alg_get(alg);
1051}
1052EXPORT_SYMBOL_GPL(crypto_stats_get);
1053
1054void crypto_stats_aead_encrypt(unsigned int cryptlen, struct crypto_alg *alg,
1055 int ret)
1056{
1057 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1058 atomic64_inc(&alg->stats.aead.err_cnt);
1059 } else {
1060 atomic64_inc(&alg->stats.aead.encrypt_cnt);
1061 atomic64_add(cryptlen, &alg->stats.aead.encrypt_tlen);
1062 }
1063 crypto_alg_put(alg);
1064}
1065EXPORT_SYMBOL_GPL(crypto_stats_aead_encrypt);
1066
1067void crypto_stats_aead_decrypt(unsigned int cryptlen, struct crypto_alg *alg,
1068 int ret)
1069{
1070 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1071 atomic64_inc(&alg->stats.aead.err_cnt);
1072 } else {
1073 atomic64_inc(&alg->stats.aead.decrypt_cnt);
1074 atomic64_add(cryptlen, &alg->stats.aead.decrypt_tlen);
1075 }
1076 crypto_alg_put(alg);
1077}
1078EXPORT_SYMBOL_GPL(crypto_stats_aead_decrypt);
1079
1080void crypto_stats_akcipher_encrypt(unsigned int src_len, int ret,
1081 struct crypto_alg *alg)
1082{
1083 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1084 atomic64_inc(&alg->stats.akcipher.err_cnt);
1085 } else {
1086 atomic64_inc(&alg->stats.akcipher.encrypt_cnt);
1087 atomic64_add(src_len, &alg->stats.akcipher.encrypt_tlen);
1088 }
1089 crypto_alg_put(alg);
1090}
1091EXPORT_SYMBOL_GPL(crypto_stats_akcipher_encrypt);
1092
1093void crypto_stats_akcipher_decrypt(unsigned int src_len, int ret,
1094 struct crypto_alg *alg)
1095{
1096 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1097 atomic64_inc(&alg->stats.akcipher.err_cnt);
1098 } else {
1099 atomic64_inc(&alg->stats.akcipher.decrypt_cnt);
1100 atomic64_add(src_len, &alg->stats.akcipher.decrypt_tlen);
1101 }
1102 crypto_alg_put(alg);
1103}
1104EXPORT_SYMBOL_GPL(crypto_stats_akcipher_decrypt);
1105
1106void crypto_stats_akcipher_sign(int ret, struct crypto_alg *alg)
1107{
1108 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1109 atomic64_inc(&alg->stats.akcipher.err_cnt);
1110 else
1111 atomic64_inc(&alg->stats.akcipher.sign_cnt);
1112 crypto_alg_put(alg);
1113}
1114EXPORT_SYMBOL_GPL(crypto_stats_akcipher_sign);
1115
1116void crypto_stats_akcipher_verify(int ret, struct crypto_alg *alg)
1117{
1118 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1119 atomic64_inc(&alg->stats.akcipher.err_cnt);
1120 else
1121 atomic64_inc(&alg->stats.akcipher.verify_cnt);
1122 crypto_alg_put(alg);
1123}
1124EXPORT_SYMBOL_GPL(crypto_stats_akcipher_verify);
1125
1126void crypto_stats_compress(unsigned int slen, int ret, struct crypto_alg *alg)
1127{
1128 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1129 atomic64_inc(&alg->stats.compress.err_cnt);
1130 } else {
1131 atomic64_inc(&alg->stats.compress.compress_cnt);
1132 atomic64_add(slen, &alg->stats.compress.compress_tlen);
1133 }
1134 crypto_alg_put(alg);
1135}
1136EXPORT_SYMBOL_GPL(crypto_stats_compress);
1137
1138void crypto_stats_decompress(unsigned int slen, int ret, struct crypto_alg *alg)
1139{
1140 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1141 atomic64_inc(&alg->stats.compress.err_cnt);
1142 } else {
1143 atomic64_inc(&alg->stats.compress.decompress_cnt);
1144 atomic64_add(slen, &alg->stats.compress.decompress_tlen);
1145 }
1146 crypto_alg_put(alg);
1147}
1148EXPORT_SYMBOL_GPL(crypto_stats_decompress);
1149
1150void crypto_stats_ahash_update(unsigned int nbytes, int ret,
1151 struct crypto_alg *alg)
1152{
1153 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1154 atomic64_inc(&alg->stats.hash.err_cnt);
1155 else
1156 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1157 crypto_alg_put(alg);
1158}
1159EXPORT_SYMBOL_GPL(crypto_stats_ahash_update);
1160
1161void crypto_stats_ahash_final(unsigned int nbytes, int ret,
1162 struct crypto_alg *alg)
1163{
1164 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1165 atomic64_inc(&alg->stats.hash.err_cnt);
1166 } else {
1167 atomic64_inc(&alg->stats.hash.hash_cnt);
1168 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1169 }
1170 crypto_alg_put(alg);
1171}
1172EXPORT_SYMBOL_GPL(crypto_stats_ahash_final);
1173
1174void crypto_stats_kpp_set_secret(struct crypto_alg *alg, int ret)
1175{
1176 if (ret)
1177 atomic64_inc(&alg->stats.kpp.err_cnt);
1178 else
1179 atomic64_inc(&alg->stats.kpp.setsecret_cnt);
1180 crypto_alg_put(alg);
1181}
1182EXPORT_SYMBOL_GPL(crypto_stats_kpp_set_secret);
1183
1184void crypto_stats_kpp_generate_public_key(struct crypto_alg *alg, int ret)
1185{
1186 if (ret)
1187 atomic64_inc(&alg->stats.kpp.err_cnt);
1188 else
1189 atomic64_inc(&alg->stats.kpp.generate_public_key_cnt);
1190 crypto_alg_put(alg);
1191}
1192EXPORT_SYMBOL_GPL(crypto_stats_kpp_generate_public_key);
1193
1194void crypto_stats_kpp_compute_shared_secret(struct crypto_alg *alg, int ret)
1195{
1196 if (ret)
1197 atomic64_inc(&alg->stats.kpp.err_cnt);
1198 else
1199 atomic64_inc(&alg->stats.kpp.compute_shared_secret_cnt);
1200 crypto_alg_put(alg);
1201}
1202EXPORT_SYMBOL_GPL(crypto_stats_kpp_compute_shared_secret);
1203
1204void crypto_stats_rng_seed(struct crypto_alg *alg, int ret)
1205{
1206 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1207 atomic64_inc(&alg->stats.rng.err_cnt);
1208 else
1209 atomic64_inc(&alg->stats.rng.seed_cnt);
1210 crypto_alg_put(alg);
1211}
1212EXPORT_SYMBOL_GPL(crypto_stats_rng_seed);
1213
1214void crypto_stats_rng_generate(struct crypto_alg *alg, unsigned int dlen,
1215 int ret)
1216{
1217 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1218 atomic64_inc(&alg->stats.rng.err_cnt);
1219 } else {
1220 atomic64_inc(&alg->stats.rng.generate_cnt);
1221 atomic64_add(dlen, &alg->stats.rng.generate_tlen);
1222 }
1223 crypto_alg_put(alg);
1224}
1225EXPORT_SYMBOL_GPL(crypto_stats_rng_generate);
1226
1227void crypto_stats_skcipher_encrypt(unsigned int cryptlen, int ret,
1228 struct crypto_alg *alg)
1229{
1230 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1231 atomic64_inc(&alg->stats.cipher.err_cnt);
1232 } else {
1233 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1234 atomic64_add(cryptlen, &alg->stats.cipher.encrypt_tlen);
1235 }
1236 crypto_alg_put(alg);
1237}
1238EXPORT_SYMBOL_GPL(crypto_stats_skcipher_encrypt);
1239
1240void crypto_stats_skcipher_decrypt(unsigned int cryptlen, int ret,
1241 struct crypto_alg *alg)
1242{
1243 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1244 atomic64_inc(&alg->stats.cipher.err_cnt);
1245 } else {
1246 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1247 atomic64_add(cryptlen, &alg->stats.cipher.decrypt_tlen);
1248 }
1249 crypto_alg_put(alg);
1250}
1251EXPORT_SYMBOL_GPL(crypto_stats_skcipher_decrypt);
1252#endif
1253
1254static void __init crypto_start_tests(void)
1255{
1256 if (IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS))
1257 return;
1258
1259 for (;;) {
1260 struct crypto_larval *larval = NULL;
1261 struct crypto_alg *q;
1262
1263 down_write(&crypto_alg_sem);
1264
1265 list_for_each_entry(q, &crypto_alg_list, cra_list) {
1266 struct crypto_larval *l;
1267
1268 if (!crypto_is_larval(q))
1269 continue;
1270
1271 l = (void *)q;
1272
1273 if (!crypto_is_test_larval(l))
1274 continue;
1275
1276 if (l->test_started)
1277 continue;
1278
1279 l->test_started = true;
1280 larval = l;
1281 break;
1282 }
1283
1284 up_write(&crypto_alg_sem);
1285
1286 if (!larval)
1287 break;
1288
1289 crypto_wait_for_test(larval);
1290 }
1291
1292 set_crypto_boot_test_finished();
1293}
1294
1295static int __init crypto_algapi_init(void)
1296{
1297 crypto_init_proc();
1298 crypto_start_tests();
1299 return 0;
1300}
1301
1302static void __exit crypto_algapi_exit(void)
1303{
1304 crypto_exit_proc();
1305}
1306
1307/*
1308 * We run this at late_initcall so that all the built-in algorithms
1309 * have had a chance to register themselves first.
1310 */
1311late_initcall(crypto_algapi_init);
1312module_exit(crypto_algapi_exit);
1313
1314MODULE_LICENSE("GPL");
1315MODULE_DESCRIPTION("Cryptographic algorithms API");
1316MODULE_SOFTDEP("pre: cryptomgr");