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13#include <linux/err.h>
14#include <linux/errno.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/list.h>
18#include <linux/module.h>
19#include <linux/rtnetlink.h>
20#include <linux/string.h>
21
22#include "internal.h"
23
24static void crypto_remove_final(struct list_head *list);
25
26static LIST_HEAD(crypto_template_list);
27
28void crypto_larval_error(const char *name, u32 type, u32 mask)
29{
30 struct crypto_alg *alg;
31
32 alg = crypto_alg_lookup(name, type, mask);
33
34 if (alg) {
35 if (crypto_is_larval(alg)) {
36 struct crypto_larval *larval = (void *)alg;
37 complete_all(&larval->completion);
38 }
39 crypto_mod_put(alg);
40 }
41}
42EXPORT_SYMBOL_GPL(crypto_larval_error);
43
44static inline int crypto_set_driver_name(struct crypto_alg *alg)
45{
46 static const char suffix[] = "-generic";
47 char *driver_name = alg->cra_driver_name;
48 int len;
49
50 if (*driver_name)
51 return 0;
52
53 len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
54 if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
55 return -ENAMETOOLONG;
56
57 memcpy(driver_name + len, suffix, sizeof(suffix));
58 return 0;
59}
60
61static int crypto_check_alg(struct crypto_alg *alg)
62{
63 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
64 return -EINVAL;
65
66 if (alg->cra_blocksize > PAGE_SIZE / 8)
67 return -EINVAL;
68
69 if (alg->cra_priority < 0)
70 return -EINVAL;
71
72 return crypto_set_driver_name(alg);
73}
74
75static void crypto_destroy_instance(struct crypto_alg *alg)
76{
77 struct crypto_instance *inst = (void *)alg;
78 struct crypto_template *tmpl = inst->tmpl;
79
80 tmpl->free(inst);
81 crypto_tmpl_put(tmpl);
82}
83
84static void crypto_remove_spawn(struct crypto_spawn *spawn,
85 struct list_head *list,
86 struct list_head *secondary_spawns)
87{
88 struct crypto_instance *inst = spawn->inst;
89 struct crypto_template *tmpl = inst->tmpl;
90
91 list_del_init(&spawn->list);
92 spawn->alg = NULL;
93
94 if (crypto_is_dead(&inst->alg))
95 return;
96
97 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
98 if (hlist_unhashed(&inst->list))
99 return;
100
101 if (!tmpl || !crypto_tmpl_get(tmpl))
102 return;
103
104 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
105 list_move(&inst->alg.cra_list, list);
106 hlist_del(&inst->list);
107 inst->alg.cra_destroy = crypto_destroy_instance;
108
109 list_splice(&inst->alg.cra_users, secondary_spawns);
110}
111
112static void crypto_remove_spawns(struct list_head *spawns,
113 struct list_head *list, u32 new_type)
114{
115 struct crypto_spawn *spawn, *n;
116 LIST_HEAD(secondary_spawns);
117
118 list_for_each_entry_safe(spawn, n, spawns, list) {
119 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
120 continue;
121
122 crypto_remove_spawn(spawn, list, &secondary_spawns);
123 }
124
125 while (!list_empty(&secondary_spawns)) {
126 list_for_each_entry_safe(spawn, n, &secondary_spawns, list)
127 crypto_remove_spawn(spawn, list, &secondary_spawns);
128 }
129}
130
131static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
132{
133 struct crypto_alg *q;
134 struct crypto_larval *larval;
135 int ret = -EAGAIN;
136
137 if (crypto_is_dead(alg))
138 goto err;
139
140 INIT_LIST_HEAD(&alg->cra_users);
141
142
143 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
144
145 ret = -EEXIST;
146
147 atomic_set(&alg->cra_refcnt, 1);
148 list_for_each_entry(q, &crypto_alg_list, cra_list) {
149 if (q == alg)
150 goto err;
151
152 if (crypto_is_larval(q)) {
153 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
154 goto err;
155 continue;
156 }
157
158 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
159 !strcmp(q->cra_name, alg->cra_driver_name))
160 goto err;
161 }
162
163 larval = crypto_larval_alloc(alg->cra_name,
164 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
165 if (IS_ERR(larval))
166 goto out;
167
168 ret = -ENOENT;
169 larval->adult = crypto_mod_get(alg);
170 if (!larval->adult)
171 goto free_larval;
172
173 atomic_set(&larval->alg.cra_refcnt, 1);
174 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
175 CRYPTO_MAX_ALG_NAME);
176 larval->alg.cra_priority = alg->cra_priority;
177
178 list_add(&alg->cra_list, &crypto_alg_list);
179 list_add(&larval->alg.cra_list, &crypto_alg_list);
180
181out:
182 return larval;
183
184free_larval:
185 kfree(larval);
186err:
187 larval = ERR_PTR(ret);
188 goto out;
189}
190
191void crypto_alg_tested(const char *name, int err)
192{
193 struct crypto_larval *test;
194 struct crypto_alg *alg;
195 struct crypto_alg *q;
196 LIST_HEAD(list);
197
198 down_write(&crypto_alg_sem);
199 list_for_each_entry(q, &crypto_alg_list, cra_list) {
200 if (!crypto_is_larval(q))
201 continue;
202
203 test = (struct crypto_larval *)q;
204
205 if (!strcmp(q->cra_driver_name, name))
206 goto found;
207 }
208
209 printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
210 goto unlock;
211
212found:
213 alg = test->adult;
214 if (err || list_empty(&alg->cra_list))
215 goto complete;
216
217 alg->cra_flags |= CRYPTO_ALG_TESTED;
218
219 list_for_each_entry(q, &crypto_alg_list, cra_list) {
220 if (q == alg)
221 continue;
222
223 if (crypto_is_moribund(q))
224 continue;
225
226 if (crypto_is_larval(q)) {
227 struct crypto_larval *larval = (void *)q;
228
229
230
231
232
233
234 if (strcmp(alg->cra_name, q->cra_name) &&
235 strcmp(alg->cra_driver_name, q->cra_name))
236 continue;
237
238 if (larval->adult)
239 continue;
240 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
241 continue;
242 if (!crypto_mod_get(alg))
243 continue;
244
245 larval->adult = alg;
246 complete_all(&larval->completion);
247 continue;
248 }
249
250 if (strcmp(alg->cra_name, q->cra_name))
251 continue;
252
253 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
254 q->cra_priority > alg->cra_priority)
255 continue;
256
257 crypto_remove_spawns(&q->cra_users, &list, alg->cra_flags);
258 }
259
260complete:
261 complete_all(&test->completion);
262
263unlock:
264 up_write(&crypto_alg_sem);
265
266 crypto_remove_final(&list);
267}
268EXPORT_SYMBOL_GPL(crypto_alg_tested);
269
270static void crypto_remove_final(struct list_head *list)
271{
272 struct crypto_alg *alg;
273 struct crypto_alg *n;
274
275 list_for_each_entry_safe(alg, n, list, cra_list) {
276 list_del_init(&alg->cra_list);
277 crypto_alg_put(alg);
278 }
279}
280
281static void crypto_wait_for_test(struct crypto_larval *larval)
282{
283 int err;
284
285 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
286 if (err != NOTIFY_STOP) {
287 if (WARN_ON(err != NOTIFY_DONE))
288 goto out;
289 crypto_alg_tested(larval->alg.cra_driver_name, 0);
290 }
291
292 err = wait_for_completion_interruptible(&larval->completion);
293 WARN_ON(err);
294
295out:
296 crypto_larval_kill(&larval->alg);
297}
298
299int crypto_register_alg(struct crypto_alg *alg)
300{
301 struct crypto_larval *larval;
302 int err;
303
304 err = crypto_check_alg(alg);
305 if (err)
306 return err;
307
308 down_write(&crypto_alg_sem);
309 larval = __crypto_register_alg(alg);
310 up_write(&crypto_alg_sem);
311
312 if (IS_ERR(larval))
313 return PTR_ERR(larval);
314
315 crypto_wait_for_test(larval);
316 return 0;
317}
318EXPORT_SYMBOL_GPL(crypto_register_alg);
319
320static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
321{
322 if (unlikely(list_empty(&alg->cra_list)))
323 return -ENOENT;
324
325 alg->cra_flags |= CRYPTO_ALG_DEAD;
326
327 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
328 list_del_init(&alg->cra_list);
329 crypto_remove_spawns(&alg->cra_users, list, alg->cra_flags);
330
331 return 0;
332}
333
334int crypto_unregister_alg(struct crypto_alg *alg)
335{
336 int ret;
337 LIST_HEAD(list);
338
339 down_write(&crypto_alg_sem);
340 ret = crypto_remove_alg(alg, &list);
341 up_write(&crypto_alg_sem);
342
343 if (ret)
344 return ret;
345
346 BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
347 if (alg->cra_destroy)
348 alg->cra_destroy(alg);
349
350 crypto_remove_final(&list);
351 return 0;
352}
353EXPORT_SYMBOL_GPL(crypto_unregister_alg);
354
355int crypto_register_template(struct crypto_template *tmpl)
356{
357 struct crypto_template *q;
358 int err = -EEXIST;
359
360 down_write(&crypto_alg_sem);
361
362 list_for_each_entry(q, &crypto_template_list, list) {
363 if (q == tmpl)
364 goto out;
365 }
366
367 list_add(&tmpl->list, &crypto_template_list);
368 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
369 err = 0;
370out:
371 up_write(&crypto_alg_sem);
372 return err;
373}
374EXPORT_SYMBOL_GPL(crypto_register_template);
375
376void crypto_unregister_template(struct crypto_template *tmpl)
377{
378 struct crypto_instance *inst;
379 struct hlist_node *p, *n;
380 struct hlist_head *list;
381 LIST_HEAD(users);
382
383 down_write(&crypto_alg_sem);
384
385 BUG_ON(list_empty(&tmpl->list));
386 list_del_init(&tmpl->list);
387
388 list = &tmpl->instances;
389 hlist_for_each_entry(inst, p, list, list) {
390 int err = crypto_remove_alg(&inst->alg, &users);
391 BUG_ON(err);
392 }
393
394 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
395
396 up_write(&crypto_alg_sem);
397
398 hlist_for_each_entry_safe(inst, p, n, list, list) {
399 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
400 tmpl->free(inst);
401 }
402 crypto_remove_final(&users);
403}
404EXPORT_SYMBOL_GPL(crypto_unregister_template);
405
406static struct crypto_template *__crypto_lookup_template(const char *name)
407{
408 struct crypto_template *q, *tmpl = NULL;
409
410 down_read(&crypto_alg_sem);
411 list_for_each_entry(q, &crypto_template_list, list) {
412 if (strcmp(q->name, name))
413 continue;
414 if (unlikely(!crypto_tmpl_get(q)))
415 continue;
416
417 tmpl = q;
418 break;
419 }
420 up_read(&crypto_alg_sem);
421
422 return tmpl;
423}
424
425struct crypto_template *crypto_lookup_template(const char *name)
426{
427 return try_then_request_module(__crypto_lookup_template(name), name);
428}
429EXPORT_SYMBOL_GPL(crypto_lookup_template);
430
431int crypto_register_instance(struct crypto_template *tmpl,
432 struct crypto_instance *inst)
433{
434 struct crypto_larval *larval;
435 int err;
436
437 err = crypto_check_alg(&inst->alg);
438 if (err)
439 goto err;
440
441 inst->alg.cra_module = tmpl->module;
442
443 down_write(&crypto_alg_sem);
444
445 larval = __crypto_register_alg(&inst->alg);
446 if (IS_ERR(larval))
447 goto unlock;
448
449 hlist_add_head(&inst->list, &tmpl->instances);
450 inst->tmpl = tmpl;
451
452unlock:
453 up_write(&crypto_alg_sem);
454
455 err = PTR_ERR(larval);
456 if (IS_ERR(larval))
457 goto err;
458
459 crypto_wait_for_test(larval);
460 err = 0;
461
462err:
463 return err;
464}
465EXPORT_SYMBOL_GPL(crypto_register_instance);
466
467int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
468 struct crypto_instance *inst, u32 mask)
469{
470 int err = -EAGAIN;
471
472 spawn->inst = inst;
473 spawn->mask = mask;
474
475 down_write(&crypto_alg_sem);
476 if (!crypto_is_moribund(alg)) {
477 list_add(&spawn->list, &alg->cra_users);
478 spawn->alg = alg;
479 err = 0;
480 }
481 up_write(&crypto_alg_sem);
482
483 return err;
484}
485EXPORT_SYMBOL_GPL(crypto_init_spawn);
486
487void crypto_drop_spawn(struct crypto_spawn *spawn)
488{
489 down_write(&crypto_alg_sem);
490 list_del(&spawn->list);
491 up_write(&crypto_alg_sem);
492}
493EXPORT_SYMBOL_GPL(crypto_drop_spawn);
494
495struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
496 u32 mask)
497{
498 struct crypto_alg *alg;
499 struct crypto_alg *alg2;
500 struct crypto_tfm *tfm;
501
502 down_read(&crypto_alg_sem);
503 alg = spawn->alg;
504 alg2 = alg;
505 if (alg2)
506 alg2 = crypto_mod_get(alg2);
507 up_read(&crypto_alg_sem);
508
509 if (!alg2) {
510 if (alg)
511 crypto_shoot_alg(alg);
512 return ERR_PTR(-EAGAIN);
513 }
514
515 tfm = ERR_PTR(-EINVAL);
516 if (unlikely((alg->cra_flags ^ type) & mask))
517 goto out_put_alg;
518
519 tfm = __crypto_alloc_tfm(alg, type, mask);
520 if (IS_ERR(tfm))
521 goto out_put_alg;
522
523 return tfm;
524
525out_put_alg:
526 crypto_mod_put(alg);
527 return tfm;
528}
529EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
530
531int crypto_register_notifier(struct notifier_block *nb)
532{
533 return blocking_notifier_chain_register(&crypto_chain, nb);
534}
535EXPORT_SYMBOL_GPL(crypto_register_notifier);
536
537int crypto_unregister_notifier(struct notifier_block *nb)
538{
539 return blocking_notifier_chain_unregister(&crypto_chain, nb);
540}
541EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
542
543struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
544{
545 struct rtattr *rta = tb[0];
546 struct crypto_attr_type *algt;
547
548 if (!rta)
549 return ERR_PTR(-ENOENT);
550 if (RTA_PAYLOAD(rta) < sizeof(*algt))
551 return ERR_PTR(-EINVAL);
552 if (rta->rta_type != CRYPTOA_TYPE)
553 return ERR_PTR(-EINVAL);
554
555 algt = RTA_DATA(rta);
556
557 return algt;
558}
559EXPORT_SYMBOL_GPL(crypto_get_attr_type);
560
561int crypto_check_attr_type(struct rtattr **tb, u32 type)
562{
563 struct crypto_attr_type *algt;
564
565 algt = crypto_get_attr_type(tb);
566 if (IS_ERR(algt))
567 return PTR_ERR(algt);
568
569 if ((algt->type ^ type) & algt->mask)
570 return -EINVAL;
571
572 return 0;
573}
574EXPORT_SYMBOL_GPL(crypto_check_attr_type);
575
576const char *crypto_attr_alg_name(struct rtattr *rta)
577{
578 struct crypto_attr_alg *alga;
579
580 if (!rta)
581 return ERR_PTR(-ENOENT);
582 if (RTA_PAYLOAD(rta) < sizeof(*alga))
583 return ERR_PTR(-EINVAL);
584 if (rta->rta_type != CRYPTOA_ALG)
585 return ERR_PTR(-EINVAL);
586
587 alga = RTA_DATA(rta);
588 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
589
590 return alga->name;
591}
592EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
593
594struct crypto_alg *crypto_attr_alg(struct rtattr *rta, u32 type, u32 mask)
595{
596 const char *name;
597 int err;
598
599 name = crypto_attr_alg_name(rta);
600 err = PTR_ERR(name);
601 if (IS_ERR(name))
602 return ERR_PTR(err);
603
604 return crypto_alg_mod_lookup(name, type, mask);
605}
606EXPORT_SYMBOL_GPL(crypto_attr_alg);
607
608int crypto_attr_u32(struct rtattr *rta, u32 *num)
609{
610 struct crypto_attr_u32 *nu32;
611
612 if (!rta)
613 return -ENOENT;
614 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
615 return -EINVAL;
616 if (rta->rta_type != CRYPTOA_U32)
617 return -EINVAL;
618
619 nu32 = RTA_DATA(rta);
620 *num = nu32->num;
621
622 return 0;
623}
624EXPORT_SYMBOL_GPL(crypto_attr_u32);
625
626struct crypto_instance *crypto_alloc_instance(const char *name,
627 struct crypto_alg *alg)
628{
629 struct crypto_instance *inst;
630 struct crypto_spawn *spawn;
631 int err;
632
633 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
634 if (!inst)
635 return ERR_PTR(-ENOMEM);
636
637 err = -ENAMETOOLONG;
638 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
639 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
640 goto err_free_inst;
641
642 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
643 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
644 goto err_free_inst;
645
646 spawn = crypto_instance_ctx(inst);
647 err = crypto_init_spawn(spawn, alg, inst,
648 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
649
650 if (err)
651 goto err_free_inst;
652
653 return inst;
654
655err_free_inst:
656 kfree(inst);
657 return ERR_PTR(err);
658}
659EXPORT_SYMBOL_GPL(crypto_alloc_instance);
660
661void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
662{
663 INIT_LIST_HEAD(&queue->list);
664 queue->backlog = &queue->list;
665 queue->qlen = 0;
666 queue->max_qlen = max_qlen;
667}
668EXPORT_SYMBOL_GPL(crypto_init_queue);
669
670int crypto_enqueue_request(struct crypto_queue *queue,
671 struct crypto_async_request *request)
672{
673 int err = -EINPROGRESS;
674
675 if (unlikely(queue->qlen >= queue->max_qlen)) {
676 err = -EBUSY;
677 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
678 goto out;
679 if (queue->backlog == &queue->list)
680 queue->backlog = &request->list;
681 }
682
683 queue->qlen++;
684 list_add_tail(&request->list, &queue->list);
685
686out:
687 return err;
688}
689EXPORT_SYMBOL_GPL(crypto_enqueue_request);
690
691struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
692{
693 struct list_head *request;
694
695 if (unlikely(!queue->qlen))
696 return NULL;
697
698 queue->qlen--;
699
700 if (queue->backlog != &queue->list)
701 queue->backlog = queue->backlog->next;
702
703 request = queue->list.next;
704 list_del(request);
705
706 return list_entry(request, struct crypto_async_request, list);
707}
708EXPORT_SYMBOL_GPL(crypto_dequeue_request);
709
710int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
711{
712 struct crypto_async_request *req;
713
714 list_for_each_entry(req, &queue->list, list) {
715 if (req->tfm == tfm)
716 return 1;
717 }
718
719 return 0;
720}
721EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
722
723static inline void crypto_inc_byte(u8 *a, unsigned int size)
724{
725 u8 *b = (a + size);
726 u8 c;
727
728 for (; size; size--) {
729 c = *--b + 1;
730 *b = c;
731 if (c)
732 break;
733 }
734}
735
736void crypto_inc(u8 *a, unsigned int size)
737{
738 __be32 *b = (__be32 *)(a + size);
739 u32 c;
740
741 for (; size >= 4; size -= 4) {
742 c = be32_to_cpu(*--b) + 1;
743 *b = cpu_to_be32(c);
744 if (c)
745 return;
746 }
747
748 crypto_inc_byte(a, size);
749}
750EXPORT_SYMBOL_GPL(crypto_inc);
751
752static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
753{
754 for (; size; size--)
755 *a++ ^= *b++;
756}
757
758void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
759{
760 u32 *a = (u32 *)dst;
761 u32 *b = (u32 *)src;
762
763 for (; size >= 4; size -= 4)
764 *a++ ^= *b++;
765
766 crypto_xor_byte((u8 *)a, (u8 *)b, size);
767}
768EXPORT_SYMBOL_GPL(crypto_xor);
769
770static int __init crypto_algapi_init(void)
771{
772 crypto_init_proc();
773 return 0;
774}
775
776static void __exit crypto_algapi_exit(void)
777{
778 crypto_exit_proc();
779}
780
781module_init(crypto_algapi_init);
782module_exit(crypto_algapi_exit);
783
784MODULE_LICENSE("GPL");
785MODULE_DESCRIPTION("Cryptographic algorithms API");
786
