Merge tag 'xtensa-20221213' of https://github.com/jcmvbkbc/linux-xtensa
[platform/kernel/linux-starfive.git] / crypto / algapi.c
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
23 static LIST_HEAD(crypto_template_list);
24
25 #ifdef CONFIG_CRYPTO_MANAGER_EXTRA_TESTS
26 DEFINE_PER_CPU(bool, crypto_simd_disabled_for_test);
27 EXPORT_PER_CPU_SYMBOL_GPL(crypto_simd_disabled_for_test);
28 #endif
29
30 static 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
37 static 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
72 static void crypto_free_instance(struct crypto_instance *inst)
73 {
74         inst->alg.cra_type->free(inst);
75 }
76
77 static 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  */
95 static 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
119 static 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  */
145 void 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 = &top;
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 }
223 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
224
225 static struct crypto_larval *crypto_alloc_test_larval(struct crypto_alg *alg)
226 {
227         struct crypto_larval *larval;
228
229         if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER))
230                 return NULL;
231
232         larval = crypto_larval_alloc(alg->cra_name,
233                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
234         if (IS_ERR(larval))
235                 return larval;
236
237         larval->adult = crypto_mod_get(alg);
238         if (!larval->adult) {
239                 kfree(larval);
240                 return ERR_PTR(-ENOENT);
241         }
242
243         refcount_set(&larval->alg.cra_refcnt, 1);
244         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
245                CRYPTO_MAX_ALG_NAME);
246         larval->alg.cra_priority = alg->cra_priority;
247
248         return larval;
249 }
250
251 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
252 {
253         struct crypto_alg *q;
254         struct crypto_larval *larval;
255         int ret = -EAGAIN;
256
257         if (crypto_is_dead(alg))
258                 goto err;
259
260         INIT_LIST_HEAD(&alg->cra_users);
261
262         /* No cheating! */
263         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
264
265         ret = -EEXIST;
266
267         list_for_each_entry(q, &crypto_alg_list, cra_list) {
268                 if (q == alg)
269                         goto err;
270
271                 if (crypto_is_moribund(q))
272                         continue;
273
274                 if (crypto_is_larval(q)) {
275                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
276                                 goto err;
277                         continue;
278                 }
279
280                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
281                     !strcmp(q->cra_name, alg->cra_driver_name))
282                         goto err;
283         }
284
285         larval = crypto_alloc_test_larval(alg);
286         if (IS_ERR(larval))
287                 goto out;
288
289         list_add(&alg->cra_list, &crypto_alg_list);
290
291         if (larval)
292                 list_add(&larval->alg.cra_list, &crypto_alg_list);
293         else
294                 alg->cra_flags |= CRYPTO_ALG_TESTED;
295
296         crypto_stats_init(alg);
297
298 out:
299         return larval;
300
301 err:
302         larval = ERR_PTR(ret);
303         goto out;
304 }
305
306 void crypto_alg_tested(const char *name, int err)
307 {
308         struct crypto_larval *test;
309         struct crypto_alg *alg;
310         struct crypto_alg *q;
311         LIST_HEAD(list);
312         bool best;
313
314         down_write(&crypto_alg_sem);
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                 test = (struct crypto_larval *)q;
320
321                 if (!strcmp(q->cra_driver_name, name))
322                         goto found;
323         }
324
325         pr_err("alg: Unexpected test result for %s: %d\n", name, err);
326         goto unlock;
327
328 found:
329         q->cra_flags |= CRYPTO_ALG_DEAD;
330         alg = test->adult;
331
332         if (list_empty(&alg->cra_list))
333                 goto complete;
334
335         if (err == -ECANCELED)
336                 alg->cra_flags |= CRYPTO_ALG_FIPS_INTERNAL;
337         else if (err)
338                 goto complete;
339         else
340                 alg->cra_flags &= ~CRYPTO_ALG_FIPS_INTERNAL;
341
342         alg->cra_flags |= CRYPTO_ALG_TESTED;
343
344         /* Only satisfy larval waiters if we are the best. */
345         best = true;
346         list_for_each_entry(q, &crypto_alg_list, cra_list) {
347                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
348                         continue;
349
350                 if (strcmp(alg->cra_name, q->cra_name))
351                         continue;
352
353                 if (q->cra_priority > alg->cra_priority) {
354                         best = false;
355                         break;
356                 }
357         }
358
359         list_for_each_entry(q, &crypto_alg_list, cra_list) {
360                 if (q == alg)
361                         continue;
362
363                 if (crypto_is_moribund(q))
364                         continue;
365
366                 if (crypto_is_larval(q)) {
367                         struct crypto_larval *larval = (void *)q;
368
369                         /*
370                          * Check to see if either our generic name or
371                          * specific name can satisfy the name requested
372                          * by the larval entry q.
373                          */
374                         if (strcmp(alg->cra_name, q->cra_name) &&
375                             strcmp(alg->cra_driver_name, q->cra_name))
376                                 continue;
377
378                         if (larval->adult)
379                                 continue;
380                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
381                                 continue;
382
383                         if (best && crypto_mod_get(alg))
384                                 larval->adult = alg;
385                         else
386                                 larval->adult = ERR_PTR(-EAGAIN);
387
388                         continue;
389                 }
390
391                 if (strcmp(alg->cra_name, q->cra_name))
392                         continue;
393
394                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
395                     q->cra_priority > alg->cra_priority)
396                         continue;
397
398                 crypto_remove_spawns(q, &list, alg);
399         }
400
401 complete:
402         complete_all(&test->completion);
403
404 unlock:
405         up_write(&crypto_alg_sem);
406
407         crypto_remove_final(&list);
408 }
409 EXPORT_SYMBOL_GPL(crypto_alg_tested);
410
411 void crypto_remove_final(struct list_head *list)
412 {
413         struct crypto_alg *alg;
414         struct crypto_alg *n;
415
416         list_for_each_entry_safe(alg, n, list, cra_list) {
417                 list_del_init(&alg->cra_list);
418                 crypto_alg_put(alg);
419         }
420 }
421 EXPORT_SYMBOL_GPL(crypto_remove_final);
422
423 int crypto_register_alg(struct crypto_alg *alg)
424 {
425         struct crypto_larval *larval;
426         bool test_started;
427         int err;
428
429         alg->cra_flags &= ~CRYPTO_ALG_DEAD;
430         err = crypto_check_alg(alg);
431         if (err)
432                 return err;
433
434         down_write(&crypto_alg_sem);
435         larval = __crypto_register_alg(alg);
436         test_started = static_key_enabled(&crypto_boot_test_finished);
437         if (!IS_ERR_OR_NULL(larval))
438                 larval->test_started = test_started;
439         up_write(&crypto_alg_sem);
440
441         if (IS_ERR_OR_NULL(larval))
442                 return PTR_ERR(larval);
443
444         if (test_started)
445                 crypto_wait_for_test(larval);
446         return 0;
447 }
448 EXPORT_SYMBOL_GPL(crypto_register_alg);
449
450 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
451 {
452         if (unlikely(list_empty(&alg->cra_list)))
453                 return -ENOENT;
454
455         alg->cra_flags |= CRYPTO_ALG_DEAD;
456
457         list_del_init(&alg->cra_list);
458         crypto_remove_spawns(alg, list, NULL);
459
460         return 0;
461 }
462
463 void crypto_unregister_alg(struct crypto_alg *alg)
464 {
465         int ret;
466         LIST_HEAD(list);
467
468         down_write(&crypto_alg_sem);
469         ret = crypto_remove_alg(alg, &list);
470         up_write(&crypto_alg_sem);
471
472         if (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name))
473                 return;
474
475         BUG_ON(refcount_read(&alg->cra_refcnt) != 1);
476         if (alg->cra_destroy)
477                 alg->cra_destroy(alg);
478
479         crypto_remove_final(&list);
480 }
481 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
482
483 int crypto_register_algs(struct crypto_alg *algs, int count)
484 {
485         int i, ret;
486
487         for (i = 0; i < count; i++) {
488                 ret = crypto_register_alg(&algs[i]);
489                 if (ret)
490                         goto err;
491         }
492
493         return 0;
494
495 err:
496         for (--i; i >= 0; --i)
497                 crypto_unregister_alg(&algs[i]);
498
499         return ret;
500 }
501 EXPORT_SYMBOL_GPL(crypto_register_algs);
502
503 void crypto_unregister_algs(struct crypto_alg *algs, int count)
504 {
505         int i;
506
507         for (i = 0; i < count; i++)
508                 crypto_unregister_alg(&algs[i]);
509 }
510 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
511
512 int crypto_register_template(struct crypto_template *tmpl)
513 {
514         struct crypto_template *q;
515         int err = -EEXIST;
516
517         down_write(&crypto_alg_sem);
518
519         crypto_check_module_sig(tmpl->module);
520
521         list_for_each_entry(q, &crypto_template_list, list) {
522                 if (q == tmpl)
523                         goto out;
524         }
525
526         list_add(&tmpl->list, &crypto_template_list);
527         err = 0;
528 out:
529         up_write(&crypto_alg_sem);
530         return err;
531 }
532 EXPORT_SYMBOL_GPL(crypto_register_template);
533
534 int crypto_register_templates(struct crypto_template *tmpls, int count)
535 {
536         int i, err;
537
538         for (i = 0; i < count; i++) {
539                 err = crypto_register_template(&tmpls[i]);
540                 if (err)
541                         goto out;
542         }
543         return 0;
544
545 out:
546         for (--i; i >= 0; --i)
547                 crypto_unregister_template(&tmpls[i]);
548         return err;
549 }
550 EXPORT_SYMBOL_GPL(crypto_register_templates);
551
552 void crypto_unregister_template(struct crypto_template *tmpl)
553 {
554         struct crypto_instance *inst;
555         struct hlist_node *n;
556         struct hlist_head *list;
557         LIST_HEAD(users);
558
559         down_write(&crypto_alg_sem);
560
561         BUG_ON(list_empty(&tmpl->list));
562         list_del_init(&tmpl->list);
563
564         list = &tmpl->instances;
565         hlist_for_each_entry(inst, list, list) {
566                 int err = crypto_remove_alg(&inst->alg, &users);
567
568                 BUG_ON(err);
569         }
570
571         up_write(&crypto_alg_sem);
572
573         hlist_for_each_entry_safe(inst, n, list, list) {
574                 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
575                 crypto_free_instance(inst);
576         }
577         crypto_remove_final(&users);
578 }
579 EXPORT_SYMBOL_GPL(crypto_unregister_template);
580
581 void crypto_unregister_templates(struct crypto_template *tmpls, int count)
582 {
583         int i;
584
585         for (i = count - 1; i >= 0; --i)
586                 crypto_unregister_template(&tmpls[i]);
587 }
588 EXPORT_SYMBOL_GPL(crypto_unregister_templates);
589
590 static struct crypto_template *__crypto_lookup_template(const char *name)
591 {
592         struct crypto_template *q, *tmpl = NULL;
593
594         down_read(&crypto_alg_sem);
595         list_for_each_entry(q, &crypto_template_list, list) {
596                 if (strcmp(q->name, name))
597                         continue;
598                 if (unlikely(!crypto_tmpl_get(q)))
599                         continue;
600
601                 tmpl = q;
602                 break;
603         }
604         up_read(&crypto_alg_sem);
605
606         return tmpl;
607 }
608
609 struct crypto_template *crypto_lookup_template(const char *name)
610 {
611         return try_then_request_module(__crypto_lookup_template(name),
612                                        "crypto-%s", name);
613 }
614 EXPORT_SYMBOL_GPL(crypto_lookup_template);
615
616 int crypto_register_instance(struct crypto_template *tmpl,
617                              struct crypto_instance *inst)
618 {
619         struct crypto_larval *larval;
620         struct crypto_spawn *spawn;
621         u32 fips_internal = 0;
622         int err;
623
624         err = crypto_check_alg(&inst->alg);
625         if (err)
626                 return err;
627
628         inst->alg.cra_module = tmpl->module;
629         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
630
631         down_write(&crypto_alg_sem);
632
633         larval = ERR_PTR(-EAGAIN);
634         for (spawn = inst->spawns; spawn;) {
635                 struct crypto_spawn *next;
636
637                 if (spawn->dead)
638                         goto unlock;
639
640                 next = spawn->next;
641                 spawn->inst = inst;
642                 spawn->registered = true;
643
644                 fips_internal |= spawn->alg->cra_flags;
645
646                 crypto_mod_put(spawn->alg);
647
648                 spawn = next;
649         }
650
651         inst->alg.cra_flags |= (fips_internal & CRYPTO_ALG_FIPS_INTERNAL);
652
653         larval = __crypto_register_alg(&inst->alg);
654         if (IS_ERR(larval))
655                 goto unlock;
656         else if (larval)
657                 larval->test_started = true;
658
659         hlist_add_head(&inst->list, &tmpl->instances);
660         inst->tmpl = tmpl;
661
662 unlock:
663         up_write(&crypto_alg_sem);
664
665         err = PTR_ERR(larval);
666         if (IS_ERR_OR_NULL(larval))
667                 goto err;
668
669         crypto_wait_for_test(larval);
670         err = 0;
671
672 err:
673         return err;
674 }
675 EXPORT_SYMBOL_GPL(crypto_register_instance);
676
677 void crypto_unregister_instance(struct crypto_instance *inst)
678 {
679         LIST_HEAD(list);
680
681         down_write(&crypto_alg_sem);
682
683         crypto_remove_spawns(&inst->alg, &list, NULL);
684         crypto_remove_instance(inst, &list);
685
686         up_write(&crypto_alg_sem);
687
688         crypto_remove_final(&list);
689 }
690 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
691
692 int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
693                       const char *name, u32 type, u32 mask)
694 {
695         struct crypto_alg *alg;
696         int err = -EAGAIN;
697
698         if (WARN_ON_ONCE(inst == NULL))
699                 return -EINVAL;
700
701         /* Allow the result of crypto_attr_alg_name() to be passed directly */
702         if (IS_ERR(name))
703                 return PTR_ERR(name);
704
705         alg = crypto_find_alg(name, spawn->frontend,
706                               type | CRYPTO_ALG_FIPS_INTERNAL, mask);
707         if (IS_ERR(alg))
708                 return PTR_ERR(alg);
709
710         down_write(&crypto_alg_sem);
711         if (!crypto_is_moribund(alg)) {
712                 list_add(&spawn->list, &alg->cra_users);
713                 spawn->alg = alg;
714                 spawn->mask = mask;
715                 spawn->next = inst->spawns;
716                 inst->spawns = spawn;
717                 inst->alg.cra_flags |=
718                         (alg->cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
719                 err = 0;
720         }
721         up_write(&crypto_alg_sem);
722         if (err)
723                 crypto_mod_put(alg);
724         return err;
725 }
726 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
727
728 void crypto_drop_spawn(struct crypto_spawn *spawn)
729 {
730         if (!spawn->alg) /* not yet initialized? */
731                 return;
732
733         down_write(&crypto_alg_sem);
734         if (!spawn->dead)
735                 list_del(&spawn->list);
736         up_write(&crypto_alg_sem);
737
738         if (!spawn->registered)
739                 crypto_mod_put(spawn->alg);
740 }
741 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
742
743 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
744 {
745         struct crypto_alg *alg = ERR_PTR(-EAGAIN);
746         struct crypto_alg *target;
747         bool shoot = false;
748
749         down_read(&crypto_alg_sem);
750         if (!spawn->dead) {
751                 alg = spawn->alg;
752                 if (!crypto_mod_get(alg)) {
753                         target = crypto_alg_get(alg);
754                         shoot = true;
755                         alg = ERR_PTR(-EAGAIN);
756                 }
757         }
758         up_read(&crypto_alg_sem);
759
760         if (shoot) {
761                 crypto_shoot_alg(target);
762                 crypto_alg_put(target);
763         }
764
765         return alg;
766 }
767
768 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
769                                     u32 mask)
770 {
771         struct crypto_alg *alg;
772         struct crypto_tfm *tfm;
773
774         alg = crypto_spawn_alg(spawn);
775         if (IS_ERR(alg))
776                 return ERR_CAST(alg);
777
778         tfm = ERR_PTR(-EINVAL);
779         if (unlikely((alg->cra_flags ^ type) & mask))
780                 goto out_put_alg;
781
782         tfm = __crypto_alloc_tfm(alg, type, mask);
783         if (IS_ERR(tfm))
784                 goto out_put_alg;
785
786         return tfm;
787
788 out_put_alg:
789         crypto_mod_put(alg);
790         return tfm;
791 }
792 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
793
794 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
795 {
796         struct crypto_alg *alg;
797         struct crypto_tfm *tfm;
798
799         alg = crypto_spawn_alg(spawn);
800         if (IS_ERR(alg))
801                 return ERR_CAST(alg);
802
803         tfm = crypto_create_tfm(alg, spawn->frontend);
804         if (IS_ERR(tfm))
805                 goto out_put_alg;
806
807         return tfm;
808
809 out_put_alg:
810         crypto_mod_put(alg);
811         return tfm;
812 }
813 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
814
815 int crypto_register_notifier(struct notifier_block *nb)
816 {
817         return blocking_notifier_chain_register(&crypto_chain, nb);
818 }
819 EXPORT_SYMBOL_GPL(crypto_register_notifier);
820
821 int crypto_unregister_notifier(struct notifier_block *nb)
822 {
823         return blocking_notifier_chain_unregister(&crypto_chain, nb);
824 }
825 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
826
827 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
828 {
829         struct rtattr *rta = tb[0];
830         struct crypto_attr_type *algt;
831
832         if (!rta)
833                 return ERR_PTR(-ENOENT);
834         if (RTA_PAYLOAD(rta) < sizeof(*algt))
835                 return ERR_PTR(-EINVAL);
836         if (rta->rta_type != CRYPTOA_TYPE)
837                 return ERR_PTR(-EINVAL);
838
839         algt = RTA_DATA(rta);
840
841         return algt;
842 }
843 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
844
845 /**
846  * crypto_check_attr_type() - check algorithm type and compute inherited mask
847  * @tb: the template parameters
848  * @type: the algorithm type the template would be instantiated as
849  * @mask_ret: (output) the mask that should be passed to crypto_grab_*()
850  *            to restrict the flags of any inner algorithms
851  *
852  * Validate that the algorithm type the user requested is compatible with the
853  * one the template would actually be instantiated as.  E.g., if the user is
854  * doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because
855  * the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm.
856  *
857  * Also compute the mask to use to restrict the flags of any inner algorithms.
858  *
859  * Return: 0 on success; -errno on failure
860  */
861 int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret)
862 {
863         struct crypto_attr_type *algt;
864
865         algt = crypto_get_attr_type(tb);
866         if (IS_ERR(algt))
867                 return PTR_ERR(algt);
868
869         if ((algt->type ^ type) & algt->mask)
870                 return -EINVAL;
871
872         *mask_ret = crypto_algt_inherited_mask(algt);
873         return 0;
874 }
875 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
876
877 const char *crypto_attr_alg_name(struct rtattr *rta)
878 {
879         struct crypto_attr_alg *alga;
880
881         if (!rta)
882                 return ERR_PTR(-ENOENT);
883         if (RTA_PAYLOAD(rta) < sizeof(*alga))
884                 return ERR_PTR(-EINVAL);
885         if (rta->rta_type != CRYPTOA_ALG)
886                 return ERR_PTR(-EINVAL);
887
888         alga = RTA_DATA(rta);
889         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
890
891         return alga->name;
892 }
893 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
894
895 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
896                         struct crypto_alg *alg)
897 {
898         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
899                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
900                 return -ENAMETOOLONG;
901
902         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
903                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
904                 return -ENAMETOOLONG;
905
906         return 0;
907 }
908 EXPORT_SYMBOL_GPL(crypto_inst_setname);
909
910 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
911 {
912         INIT_LIST_HEAD(&queue->list);
913         queue->backlog = &queue->list;
914         queue->qlen = 0;
915         queue->max_qlen = max_qlen;
916 }
917 EXPORT_SYMBOL_GPL(crypto_init_queue);
918
919 int crypto_enqueue_request(struct crypto_queue *queue,
920                            struct crypto_async_request *request)
921 {
922         int err = -EINPROGRESS;
923
924         if (unlikely(queue->qlen >= queue->max_qlen)) {
925                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
926                         err = -ENOSPC;
927                         goto out;
928                 }
929                 err = -EBUSY;
930                 if (queue->backlog == &queue->list)
931                         queue->backlog = &request->list;
932         }
933
934         queue->qlen++;
935         list_add_tail(&request->list, &queue->list);
936
937 out:
938         return err;
939 }
940 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
941
942 void crypto_enqueue_request_head(struct crypto_queue *queue,
943                                  struct crypto_async_request *request)
944 {
945         queue->qlen++;
946         list_add(&request->list, &queue->list);
947 }
948 EXPORT_SYMBOL_GPL(crypto_enqueue_request_head);
949
950 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
951 {
952         struct list_head *request;
953
954         if (unlikely(!queue->qlen))
955                 return NULL;
956
957         queue->qlen--;
958
959         if (queue->backlog != &queue->list)
960                 queue->backlog = queue->backlog->next;
961
962         request = queue->list.next;
963         list_del(request);
964
965         return list_entry(request, struct crypto_async_request, list);
966 }
967 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
968
969 static inline void crypto_inc_byte(u8 *a, unsigned int size)
970 {
971         u8 *b = (a + size);
972         u8 c;
973
974         for (; size; size--) {
975                 c = *--b + 1;
976                 *b = c;
977                 if (c)
978                         break;
979         }
980 }
981
982 void crypto_inc(u8 *a, unsigned int size)
983 {
984         __be32 *b = (__be32 *)(a + size);
985         u32 c;
986
987         if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
988             IS_ALIGNED((unsigned long)b, __alignof__(*b)))
989                 for (; size >= 4; size -= 4) {
990                         c = be32_to_cpu(*--b) + 1;
991                         *b = cpu_to_be32(c);
992                         if (likely(c))
993                                 return;
994                 }
995
996         crypto_inc_byte(a, size);
997 }
998 EXPORT_SYMBOL_GPL(crypto_inc);
999
1000 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1001 {
1002         return alg->cra_ctxsize +
1003                (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1004 }
1005 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1006
1007 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1008                         u32 type, u32 mask)
1009 {
1010         int ret = 0;
1011         struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1012
1013         if (!IS_ERR(alg)) {
1014                 crypto_mod_put(alg);
1015                 ret = 1;
1016         }
1017
1018         return ret;
1019 }
1020 EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1021
1022 #ifdef CONFIG_CRYPTO_STATS
1023 void crypto_stats_init(struct crypto_alg *alg)
1024 {
1025         memset(&alg->stats, 0, sizeof(alg->stats));
1026 }
1027 EXPORT_SYMBOL_GPL(crypto_stats_init);
1028
1029 void crypto_stats_get(struct crypto_alg *alg)
1030 {
1031         crypto_alg_get(alg);
1032 }
1033 EXPORT_SYMBOL_GPL(crypto_stats_get);
1034
1035 void crypto_stats_aead_encrypt(unsigned int cryptlen, struct crypto_alg *alg,
1036                                int ret)
1037 {
1038         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1039                 atomic64_inc(&alg->stats.aead.err_cnt);
1040         } else {
1041                 atomic64_inc(&alg->stats.aead.encrypt_cnt);
1042                 atomic64_add(cryptlen, &alg->stats.aead.encrypt_tlen);
1043         }
1044         crypto_alg_put(alg);
1045 }
1046 EXPORT_SYMBOL_GPL(crypto_stats_aead_encrypt);
1047
1048 void crypto_stats_aead_decrypt(unsigned int cryptlen, struct crypto_alg *alg,
1049                                int ret)
1050 {
1051         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1052                 atomic64_inc(&alg->stats.aead.err_cnt);
1053         } else {
1054                 atomic64_inc(&alg->stats.aead.decrypt_cnt);
1055                 atomic64_add(cryptlen, &alg->stats.aead.decrypt_tlen);
1056         }
1057         crypto_alg_put(alg);
1058 }
1059 EXPORT_SYMBOL_GPL(crypto_stats_aead_decrypt);
1060
1061 void crypto_stats_akcipher_encrypt(unsigned int src_len, int ret,
1062                                    struct crypto_alg *alg)
1063 {
1064         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1065                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1066         } else {
1067                 atomic64_inc(&alg->stats.akcipher.encrypt_cnt);
1068                 atomic64_add(src_len, &alg->stats.akcipher.encrypt_tlen);
1069         }
1070         crypto_alg_put(alg);
1071 }
1072 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_encrypt);
1073
1074 void crypto_stats_akcipher_decrypt(unsigned int src_len, int ret,
1075                                    struct crypto_alg *alg)
1076 {
1077         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1078                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1079         } else {
1080                 atomic64_inc(&alg->stats.akcipher.decrypt_cnt);
1081                 atomic64_add(src_len, &alg->stats.akcipher.decrypt_tlen);
1082         }
1083         crypto_alg_put(alg);
1084 }
1085 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_decrypt);
1086
1087 void crypto_stats_akcipher_sign(int ret, struct crypto_alg *alg)
1088 {
1089         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1090                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1091         else
1092                 atomic64_inc(&alg->stats.akcipher.sign_cnt);
1093         crypto_alg_put(alg);
1094 }
1095 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_sign);
1096
1097 void crypto_stats_akcipher_verify(int ret, struct crypto_alg *alg)
1098 {
1099         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1100                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1101         else
1102                 atomic64_inc(&alg->stats.akcipher.verify_cnt);
1103         crypto_alg_put(alg);
1104 }
1105 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_verify);
1106
1107 void crypto_stats_compress(unsigned int slen, int ret, struct crypto_alg *alg)
1108 {
1109         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1110                 atomic64_inc(&alg->stats.compress.err_cnt);
1111         } else {
1112                 atomic64_inc(&alg->stats.compress.compress_cnt);
1113                 atomic64_add(slen, &alg->stats.compress.compress_tlen);
1114         }
1115         crypto_alg_put(alg);
1116 }
1117 EXPORT_SYMBOL_GPL(crypto_stats_compress);
1118
1119 void crypto_stats_decompress(unsigned int slen, int ret, struct crypto_alg *alg)
1120 {
1121         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1122                 atomic64_inc(&alg->stats.compress.err_cnt);
1123         } else {
1124                 atomic64_inc(&alg->stats.compress.decompress_cnt);
1125                 atomic64_add(slen, &alg->stats.compress.decompress_tlen);
1126         }
1127         crypto_alg_put(alg);
1128 }
1129 EXPORT_SYMBOL_GPL(crypto_stats_decompress);
1130
1131 void crypto_stats_ahash_update(unsigned int nbytes, int ret,
1132                                struct crypto_alg *alg)
1133 {
1134         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1135                 atomic64_inc(&alg->stats.hash.err_cnt);
1136         else
1137                 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1138         crypto_alg_put(alg);
1139 }
1140 EXPORT_SYMBOL_GPL(crypto_stats_ahash_update);
1141
1142 void crypto_stats_ahash_final(unsigned int nbytes, int ret,
1143                               struct crypto_alg *alg)
1144 {
1145         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1146                 atomic64_inc(&alg->stats.hash.err_cnt);
1147         } else {
1148                 atomic64_inc(&alg->stats.hash.hash_cnt);
1149                 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1150         }
1151         crypto_alg_put(alg);
1152 }
1153 EXPORT_SYMBOL_GPL(crypto_stats_ahash_final);
1154
1155 void crypto_stats_kpp_set_secret(struct crypto_alg *alg, int ret)
1156 {
1157         if (ret)
1158                 atomic64_inc(&alg->stats.kpp.err_cnt);
1159         else
1160                 atomic64_inc(&alg->stats.kpp.setsecret_cnt);
1161         crypto_alg_put(alg);
1162 }
1163 EXPORT_SYMBOL_GPL(crypto_stats_kpp_set_secret);
1164
1165 void crypto_stats_kpp_generate_public_key(struct crypto_alg *alg, int ret)
1166 {
1167         if (ret)
1168                 atomic64_inc(&alg->stats.kpp.err_cnt);
1169         else
1170                 atomic64_inc(&alg->stats.kpp.generate_public_key_cnt);
1171         crypto_alg_put(alg);
1172 }
1173 EXPORT_SYMBOL_GPL(crypto_stats_kpp_generate_public_key);
1174
1175 void crypto_stats_kpp_compute_shared_secret(struct crypto_alg *alg, int ret)
1176 {
1177         if (ret)
1178                 atomic64_inc(&alg->stats.kpp.err_cnt);
1179         else
1180                 atomic64_inc(&alg->stats.kpp.compute_shared_secret_cnt);
1181         crypto_alg_put(alg);
1182 }
1183 EXPORT_SYMBOL_GPL(crypto_stats_kpp_compute_shared_secret);
1184
1185 void crypto_stats_rng_seed(struct crypto_alg *alg, int ret)
1186 {
1187         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1188                 atomic64_inc(&alg->stats.rng.err_cnt);
1189         else
1190                 atomic64_inc(&alg->stats.rng.seed_cnt);
1191         crypto_alg_put(alg);
1192 }
1193 EXPORT_SYMBOL_GPL(crypto_stats_rng_seed);
1194
1195 void crypto_stats_rng_generate(struct crypto_alg *alg, unsigned int dlen,
1196                                int ret)
1197 {
1198         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1199                 atomic64_inc(&alg->stats.rng.err_cnt);
1200         } else {
1201                 atomic64_inc(&alg->stats.rng.generate_cnt);
1202                 atomic64_add(dlen, &alg->stats.rng.generate_tlen);
1203         }
1204         crypto_alg_put(alg);
1205 }
1206 EXPORT_SYMBOL_GPL(crypto_stats_rng_generate);
1207
1208 void crypto_stats_skcipher_encrypt(unsigned int cryptlen, int ret,
1209                                    struct crypto_alg *alg)
1210 {
1211         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1212                 atomic64_inc(&alg->stats.cipher.err_cnt);
1213         } else {
1214                 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1215                 atomic64_add(cryptlen, &alg->stats.cipher.encrypt_tlen);
1216         }
1217         crypto_alg_put(alg);
1218 }
1219 EXPORT_SYMBOL_GPL(crypto_stats_skcipher_encrypt);
1220
1221 void crypto_stats_skcipher_decrypt(unsigned int cryptlen, int ret,
1222                                    struct crypto_alg *alg)
1223 {
1224         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1225                 atomic64_inc(&alg->stats.cipher.err_cnt);
1226         } else {
1227                 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1228                 atomic64_add(cryptlen, &alg->stats.cipher.decrypt_tlen);
1229         }
1230         crypto_alg_put(alg);
1231 }
1232 EXPORT_SYMBOL_GPL(crypto_stats_skcipher_decrypt);
1233 #endif
1234
1235 static void __init crypto_start_tests(void)
1236 {
1237         for (;;) {
1238                 struct crypto_larval *larval = NULL;
1239                 struct crypto_alg *q;
1240
1241                 down_write(&crypto_alg_sem);
1242
1243                 list_for_each_entry(q, &crypto_alg_list, cra_list) {
1244                         struct crypto_larval *l;
1245
1246                         if (!crypto_is_larval(q))
1247                                 continue;
1248
1249                         l = (void *)q;
1250
1251                         if (!crypto_is_test_larval(l))
1252                                 continue;
1253
1254                         if (l->test_started)
1255                                 continue;
1256
1257                         l->test_started = true;
1258                         larval = l;
1259                         break;
1260                 }
1261
1262                 up_write(&crypto_alg_sem);
1263
1264                 if (!larval)
1265                         break;
1266
1267                 crypto_wait_for_test(larval);
1268         }
1269
1270         static_branch_enable(&crypto_boot_test_finished);
1271 }
1272
1273 static int __init crypto_algapi_init(void)
1274 {
1275         crypto_init_proc();
1276         crypto_start_tests();
1277         return 0;
1278 }
1279
1280 static void __exit crypto_algapi_exit(void)
1281 {
1282         crypto_exit_proc();
1283 }
1284
1285 /*
1286  * We run this at late_initcall so that all the built-in algorithms
1287  * have had a chance to register themselves first.
1288  */
1289 late_initcall(crypto_algapi_init);
1290 module_exit(crypto_algapi_exit);
1291
1292 MODULE_LICENSE("GPL");
1293 MODULE_DESCRIPTION("Cryptographic algorithms API");
1294 MODULE_SOFTDEP("pre: cryptomgr");