Root/
1 | /* |
2 | * Software async crypto daemon. |
3 | * |
4 | * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> |
5 | * |
6 | * Added AEAD support to cryptd. |
7 | * Authors: Tadeusz Struk (tadeusz.struk@intel.com) |
8 | * Adrian Hoban <adrian.hoban@intel.com> |
9 | * Gabriele Paoloni <gabriele.paoloni@intel.com> |
10 | * Aidan O'Mahony (aidan.o.mahony@intel.com) |
11 | * Copyright (c) 2010, Intel Corporation. |
12 | * |
13 | * This program is free software; you can redistribute it and/or modify it |
14 | * under the terms of the GNU General Public License as published by the Free |
15 | * Software Foundation; either version 2 of the License, or (at your option) |
16 | * any later version. |
17 | * |
18 | */ |
19 | |
20 | #include <crypto/algapi.h> |
21 | #include <crypto/internal/hash.h> |
22 | #include <crypto/internal/aead.h> |
23 | #include <crypto/cryptd.h> |
24 | #include <crypto/crypto_wq.h> |
25 | #include <linux/err.h> |
26 | #include <linux/init.h> |
27 | #include <linux/kernel.h> |
28 | #include <linux/list.h> |
29 | #include <linux/module.h> |
30 | #include <linux/scatterlist.h> |
31 | #include <linux/sched.h> |
32 | #include <linux/slab.h> |
33 | |
34 | #define CRYPTD_MAX_CPU_QLEN 100 |
35 | |
36 | struct cryptd_cpu_queue { |
37 | struct crypto_queue queue; |
38 | struct work_struct work; |
39 | }; |
40 | |
41 | struct cryptd_queue { |
42 | struct cryptd_cpu_queue __percpu *cpu_queue; |
43 | }; |
44 | |
45 | struct cryptd_instance_ctx { |
46 | struct crypto_spawn spawn; |
47 | struct cryptd_queue *queue; |
48 | }; |
49 | |
50 | struct hashd_instance_ctx { |
51 | struct crypto_shash_spawn spawn; |
52 | struct cryptd_queue *queue; |
53 | }; |
54 | |
55 | struct aead_instance_ctx { |
56 | struct crypto_aead_spawn aead_spawn; |
57 | struct cryptd_queue *queue; |
58 | }; |
59 | |
60 | struct cryptd_blkcipher_ctx { |
61 | struct crypto_blkcipher *child; |
62 | }; |
63 | |
64 | struct cryptd_blkcipher_request_ctx { |
65 | crypto_completion_t complete; |
66 | }; |
67 | |
68 | struct cryptd_hash_ctx { |
69 | struct crypto_shash *child; |
70 | }; |
71 | |
72 | struct cryptd_hash_request_ctx { |
73 | crypto_completion_t complete; |
74 | struct shash_desc desc; |
75 | }; |
76 | |
77 | struct cryptd_aead_ctx { |
78 | struct crypto_aead *child; |
79 | }; |
80 | |
81 | struct cryptd_aead_request_ctx { |
82 | crypto_completion_t complete; |
83 | }; |
84 | |
85 | static void cryptd_queue_worker(struct work_struct *work); |
86 | |
87 | static int cryptd_init_queue(struct cryptd_queue *queue, |
88 | unsigned int max_cpu_qlen) |
89 | { |
90 | int cpu; |
91 | struct cryptd_cpu_queue *cpu_queue; |
92 | |
93 | queue->cpu_queue = alloc_percpu(struct cryptd_cpu_queue); |
94 | if (!queue->cpu_queue) |
95 | return -ENOMEM; |
96 | for_each_possible_cpu(cpu) { |
97 | cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu); |
98 | crypto_init_queue(&cpu_queue->queue, max_cpu_qlen); |
99 | INIT_WORK(&cpu_queue->work, cryptd_queue_worker); |
100 | } |
101 | return 0; |
102 | } |
103 | |
104 | static void cryptd_fini_queue(struct cryptd_queue *queue) |
105 | { |
106 | int cpu; |
107 | struct cryptd_cpu_queue *cpu_queue; |
108 | |
109 | for_each_possible_cpu(cpu) { |
110 | cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu); |
111 | BUG_ON(cpu_queue->queue.qlen); |
112 | } |
113 | free_percpu(queue->cpu_queue); |
114 | } |
115 | |
116 | static int cryptd_enqueue_request(struct cryptd_queue *queue, |
117 | struct crypto_async_request *request) |
118 | { |
119 | int cpu, err; |
120 | struct cryptd_cpu_queue *cpu_queue; |
121 | |
122 | cpu = get_cpu(); |
123 | cpu_queue = this_cpu_ptr(queue->cpu_queue); |
124 | err = crypto_enqueue_request(&cpu_queue->queue, request); |
125 | queue_work_on(cpu, kcrypto_wq, &cpu_queue->work); |
126 | put_cpu(); |
127 | |
128 | return err; |
129 | } |
130 | |
131 | /* Called in workqueue context, do one real cryption work (via |
132 | * req->complete) and reschedule itself if there are more work to |
133 | * do. */ |
134 | static void cryptd_queue_worker(struct work_struct *work) |
135 | { |
136 | struct cryptd_cpu_queue *cpu_queue; |
137 | struct crypto_async_request *req, *backlog; |
138 | |
139 | cpu_queue = container_of(work, struct cryptd_cpu_queue, work); |
140 | /* |
141 | * Only handle one request at a time to avoid hogging crypto workqueue. |
142 | * preempt_disable/enable is used to prevent being preempted by |
143 | * cryptd_enqueue_request(). local_bh_disable/enable is used to prevent |
144 | * cryptd_enqueue_request() being accessed from software interrupts. |
145 | */ |
146 | local_bh_disable(); |
147 | preempt_disable(); |
148 | backlog = crypto_get_backlog(&cpu_queue->queue); |
149 | req = crypto_dequeue_request(&cpu_queue->queue); |
150 | preempt_enable(); |
151 | local_bh_enable(); |
152 | |
153 | if (!req) |
154 | return; |
155 | |
156 | if (backlog) |
157 | backlog->complete(backlog, -EINPROGRESS); |
158 | req->complete(req, 0); |
159 | |
160 | if (cpu_queue->queue.qlen) |
161 | queue_work(kcrypto_wq, &cpu_queue->work); |
162 | } |
163 | |
164 | static inline struct cryptd_queue *cryptd_get_queue(struct crypto_tfm *tfm) |
165 | { |
166 | struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); |
167 | struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst); |
168 | return ictx->queue; |
169 | } |
170 | |
171 | static int cryptd_blkcipher_setkey(struct crypto_ablkcipher *parent, |
172 | const u8 *key, unsigned int keylen) |
173 | { |
174 | struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(parent); |
175 | struct crypto_blkcipher *child = ctx->child; |
176 | int err; |
177 | |
178 | crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK); |
179 | crypto_blkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) & |
180 | CRYPTO_TFM_REQ_MASK); |
181 | err = crypto_blkcipher_setkey(child, key, keylen); |
182 | crypto_ablkcipher_set_flags(parent, crypto_blkcipher_get_flags(child) & |
183 | CRYPTO_TFM_RES_MASK); |
184 | return err; |
185 | } |
186 | |
187 | static void cryptd_blkcipher_crypt(struct ablkcipher_request *req, |
188 | struct crypto_blkcipher *child, |
189 | int err, |
190 | int (*crypt)(struct blkcipher_desc *desc, |
191 | struct scatterlist *dst, |
192 | struct scatterlist *src, |
193 | unsigned int len)) |
194 | { |
195 | struct cryptd_blkcipher_request_ctx *rctx; |
196 | struct blkcipher_desc desc; |
197 | |
198 | rctx = ablkcipher_request_ctx(req); |
199 | |
200 | if (unlikely(err == -EINPROGRESS)) |
201 | goto out; |
202 | |
203 | desc.tfm = child; |
204 | desc.info = req->info; |
205 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; |
206 | |
207 | err = crypt(&desc, req->dst, req->src, req->nbytes); |
208 | |
209 | req->base.complete = rctx->complete; |
210 | |
211 | out: |
212 | local_bh_disable(); |
213 | rctx->complete(&req->base, err); |
214 | local_bh_enable(); |
215 | } |
216 | |
217 | static void cryptd_blkcipher_encrypt(struct crypto_async_request *req, int err) |
218 | { |
219 | struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm); |
220 | struct crypto_blkcipher *child = ctx->child; |
221 | |
222 | cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err, |
223 | crypto_blkcipher_crt(child)->encrypt); |
224 | } |
225 | |
226 | static void cryptd_blkcipher_decrypt(struct crypto_async_request *req, int err) |
227 | { |
228 | struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm); |
229 | struct crypto_blkcipher *child = ctx->child; |
230 | |
231 | cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err, |
232 | crypto_blkcipher_crt(child)->decrypt); |
233 | } |
234 | |
235 | static int cryptd_blkcipher_enqueue(struct ablkcipher_request *req, |
236 | crypto_completion_t complete) |
237 | { |
238 | struct cryptd_blkcipher_request_ctx *rctx = ablkcipher_request_ctx(req); |
239 | struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req); |
240 | struct cryptd_queue *queue; |
241 | |
242 | queue = cryptd_get_queue(crypto_ablkcipher_tfm(tfm)); |
243 | rctx->complete = req->base.complete; |
244 | req->base.complete = complete; |
245 | |
246 | return cryptd_enqueue_request(queue, &req->base); |
247 | } |
248 | |
249 | static int cryptd_blkcipher_encrypt_enqueue(struct ablkcipher_request *req) |
250 | { |
251 | return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_encrypt); |
252 | } |
253 | |
254 | static int cryptd_blkcipher_decrypt_enqueue(struct ablkcipher_request *req) |
255 | { |
256 | return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_decrypt); |
257 | } |
258 | |
259 | static int cryptd_blkcipher_init_tfm(struct crypto_tfm *tfm) |
260 | { |
261 | struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); |
262 | struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst); |
263 | struct crypto_spawn *spawn = &ictx->spawn; |
264 | struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm); |
265 | struct crypto_blkcipher *cipher; |
266 | |
267 | cipher = crypto_spawn_blkcipher(spawn); |
268 | if (IS_ERR(cipher)) |
269 | return PTR_ERR(cipher); |
270 | |
271 | ctx->child = cipher; |
272 | tfm->crt_ablkcipher.reqsize = |
273 | sizeof(struct cryptd_blkcipher_request_ctx); |
274 | return 0; |
275 | } |
276 | |
277 | static void cryptd_blkcipher_exit_tfm(struct crypto_tfm *tfm) |
278 | { |
279 | struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm); |
280 | |
281 | crypto_free_blkcipher(ctx->child); |
282 | } |
283 | |
284 | static void *cryptd_alloc_instance(struct crypto_alg *alg, unsigned int head, |
285 | unsigned int tail) |
286 | { |
287 | char *p; |
288 | struct crypto_instance *inst; |
289 | int err; |
290 | |
291 | p = kzalloc(head + sizeof(*inst) + tail, GFP_KERNEL); |
292 | if (!p) |
293 | return ERR_PTR(-ENOMEM); |
294 | |
295 | inst = (void *)(p + head); |
296 | |
297 | err = -ENAMETOOLONG; |
298 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
299 | "cryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
300 | goto out_free_inst; |
301 | |
302 | memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); |
303 | |
304 | inst->alg.cra_priority = alg->cra_priority + 50; |
305 | inst->alg.cra_blocksize = alg->cra_blocksize; |
306 | inst->alg.cra_alignmask = alg->cra_alignmask; |
307 | |
308 | out: |
309 | return p; |
310 | |
311 | out_free_inst: |
312 | kfree(p); |
313 | p = ERR_PTR(err); |
314 | goto out; |
315 | } |
316 | |
317 | static int cryptd_create_blkcipher(struct crypto_template *tmpl, |
318 | struct rtattr **tb, |
319 | struct cryptd_queue *queue) |
320 | { |
321 | struct cryptd_instance_ctx *ctx; |
322 | struct crypto_instance *inst; |
323 | struct crypto_alg *alg; |
324 | int err; |
325 | |
326 | alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER, |
327 | CRYPTO_ALG_TYPE_MASK); |
328 | if (IS_ERR(alg)) |
329 | return PTR_ERR(alg); |
330 | |
331 | inst = cryptd_alloc_instance(alg, 0, sizeof(*ctx)); |
332 | err = PTR_ERR(inst); |
333 | if (IS_ERR(inst)) |
334 | goto out_put_alg; |
335 | |
336 | ctx = crypto_instance_ctx(inst); |
337 | ctx->queue = queue; |
338 | |
339 | err = crypto_init_spawn(&ctx->spawn, alg, inst, |
340 | CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); |
341 | if (err) |
342 | goto out_free_inst; |
343 | |
344 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC; |
345 | inst->alg.cra_type = &crypto_ablkcipher_type; |
346 | |
347 | inst->alg.cra_ablkcipher.ivsize = alg->cra_blkcipher.ivsize; |
348 | inst->alg.cra_ablkcipher.min_keysize = alg->cra_blkcipher.min_keysize; |
349 | inst->alg.cra_ablkcipher.max_keysize = alg->cra_blkcipher.max_keysize; |
350 | |
351 | inst->alg.cra_ablkcipher.geniv = alg->cra_blkcipher.geniv; |
352 | |
353 | inst->alg.cra_ctxsize = sizeof(struct cryptd_blkcipher_ctx); |
354 | |
355 | inst->alg.cra_init = cryptd_blkcipher_init_tfm; |
356 | inst->alg.cra_exit = cryptd_blkcipher_exit_tfm; |
357 | |
358 | inst->alg.cra_ablkcipher.setkey = cryptd_blkcipher_setkey; |
359 | inst->alg.cra_ablkcipher.encrypt = cryptd_blkcipher_encrypt_enqueue; |
360 | inst->alg.cra_ablkcipher.decrypt = cryptd_blkcipher_decrypt_enqueue; |
361 | |
362 | err = crypto_register_instance(tmpl, inst); |
363 | if (err) { |
364 | crypto_drop_spawn(&ctx->spawn); |
365 | out_free_inst: |
366 | kfree(inst); |
367 | } |
368 | |
369 | out_put_alg: |
370 | crypto_mod_put(alg); |
371 | return err; |
372 | } |
373 | |
374 | static int cryptd_hash_init_tfm(struct crypto_tfm *tfm) |
375 | { |
376 | struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); |
377 | struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst); |
378 | struct crypto_shash_spawn *spawn = &ictx->spawn; |
379 | struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm); |
380 | struct crypto_shash *hash; |
381 | |
382 | hash = crypto_spawn_shash(spawn); |
383 | if (IS_ERR(hash)) |
384 | return PTR_ERR(hash); |
385 | |
386 | ctx->child = hash; |
387 | crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm), |
388 | sizeof(struct cryptd_hash_request_ctx) + |
389 | crypto_shash_descsize(hash)); |
390 | return 0; |
391 | } |
392 | |
393 | static void cryptd_hash_exit_tfm(struct crypto_tfm *tfm) |
394 | { |
395 | struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm); |
396 | |
397 | crypto_free_shash(ctx->child); |
398 | } |
399 | |
400 | static int cryptd_hash_setkey(struct crypto_ahash *parent, |
401 | const u8 *key, unsigned int keylen) |
402 | { |
403 | struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(parent); |
404 | struct crypto_shash *child = ctx->child; |
405 | int err; |
406 | |
407 | crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK); |
408 | crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) & |
409 | CRYPTO_TFM_REQ_MASK); |
410 | err = crypto_shash_setkey(child, key, keylen); |
411 | crypto_ahash_set_flags(parent, crypto_shash_get_flags(child) & |
412 | CRYPTO_TFM_RES_MASK); |
413 | return err; |
414 | } |
415 | |
416 | static int cryptd_hash_enqueue(struct ahash_request *req, |
417 | crypto_completion_t complete) |
418 | { |
419 | struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); |
420 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
421 | struct cryptd_queue *queue = |
422 | cryptd_get_queue(crypto_ahash_tfm(tfm)); |
423 | |
424 | rctx->complete = req->base.complete; |
425 | req->base.complete = complete; |
426 | |
427 | return cryptd_enqueue_request(queue, &req->base); |
428 | } |
429 | |
430 | static void cryptd_hash_init(struct crypto_async_request *req_async, int err) |
431 | { |
432 | struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm); |
433 | struct crypto_shash *child = ctx->child; |
434 | struct ahash_request *req = ahash_request_cast(req_async); |
435 | struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); |
436 | struct shash_desc *desc = &rctx->desc; |
437 | |
438 | if (unlikely(err == -EINPROGRESS)) |
439 | goto out; |
440 | |
441 | desc->tfm = child; |
442 | desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; |
443 | |
444 | err = crypto_shash_init(desc); |
445 | |
446 | req->base.complete = rctx->complete; |
447 | |
448 | out: |
449 | local_bh_disable(); |
450 | rctx->complete(&req->base, err); |
451 | local_bh_enable(); |
452 | } |
453 | |
454 | static int cryptd_hash_init_enqueue(struct ahash_request *req) |
455 | { |
456 | return cryptd_hash_enqueue(req, cryptd_hash_init); |
457 | } |
458 | |
459 | static void cryptd_hash_update(struct crypto_async_request *req_async, int err) |
460 | { |
461 | struct ahash_request *req = ahash_request_cast(req_async); |
462 | struct cryptd_hash_request_ctx *rctx; |
463 | |
464 | rctx = ahash_request_ctx(req); |
465 | |
466 | if (unlikely(err == -EINPROGRESS)) |
467 | goto out; |
468 | |
469 | err = shash_ahash_update(req, &rctx->desc); |
470 | |
471 | req->base.complete = rctx->complete; |
472 | |
473 | out: |
474 | local_bh_disable(); |
475 | rctx->complete(&req->base, err); |
476 | local_bh_enable(); |
477 | } |
478 | |
479 | static int cryptd_hash_update_enqueue(struct ahash_request *req) |
480 | { |
481 | return cryptd_hash_enqueue(req, cryptd_hash_update); |
482 | } |
483 | |
484 | static void cryptd_hash_final(struct crypto_async_request *req_async, int err) |
485 | { |
486 | struct ahash_request *req = ahash_request_cast(req_async); |
487 | struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); |
488 | |
489 | if (unlikely(err == -EINPROGRESS)) |
490 | goto out; |
491 | |
492 | err = crypto_shash_final(&rctx->desc, req->result); |
493 | |
494 | req->base.complete = rctx->complete; |
495 | |
496 | out: |
497 | local_bh_disable(); |
498 | rctx->complete(&req->base, err); |
499 | local_bh_enable(); |
500 | } |
501 | |
502 | static int cryptd_hash_final_enqueue(struct ahash_request *req) |
503 | { |
504 | return cryptd_hash_enqueue(req, cryptd_hash_final); |
505 | } |
506 | |
507 | static void cryptd_hash_finup(struct crypto_async_request *req_async, int err) |
508 | { |
509 | struct ahash_request *req = ahash_request_cast(req_async); |
510 | struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); |
511 | |
512 | if (unlikely(err == -EINPROGRESS)) |
513 | goto out; |
514 | |
515 | err = shash_ahash_finup(req, &rctx->desc); |
516 | |
517 | req->base.complete = rctx->complete; |
518 | |
519 | out: |
520 | local_bh_disable(); |
521 | rctx->complete(&req->base, err); |
522 | local_bh_enable(); |
523 | } |
524 | |
525 | static int cryptd_hash_finup_enqueue(struct ahash_request *req) |
526 | { |
527 | return cryptd_hash_enqueue(req, cryptd_hash_finup); |
528 | } |
529 | |
530 | static void cryptd_hash_digest(struct crypto_async_request *req_async, int err) |
531 | { |
532 | struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm); |
533 | struct crypto_shash *child = ctx->child; |
534 | struct ahash_request *req = ahash_request_cast(req_async); |
535 | struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); |
536 | struct shash_desc *desc = &rctx->desc; |
537 | |
538 | if (unlikely(err == -EINPROGRESS)) |
539 | goto out; |
540 | |
541 | desc->tfm = child; |
542 | desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; |
543 | |
544 | err = shash_ahash_digest(req, desc); |
545 | |
546 | req->base.complete = rctx->complete; |
547 | |
548 | out: |
549 | local_bh_disable(); |
550 | rctx->complete(&req->base, err); |
551 | local_bh_enable(); |
552 | } |
553 | |
554 | static int cryptd_hash_digest_enqueue(struct ahash_request *req) |
555 | { |
556 | return cryptd_hash_enqueue(req, cryptd_hash_digest); |
557 | } |
558 | |
559 | static int cryptd_hash_export(struct ahash_request *req, void *out) |
560 | { |
561 | struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); |
562 | |
563 | return crypto_shash_export(&rctx->desc, out); |
564 | } |
565 | |
566 | static int cryptd_hash_import(struct ahash_request *req, const void *in) |
567 | { |
568 | struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); |
569 | |
570 | return crypto_shash_import(&rctx->desc, in); |
571 | } |
572 | |
573 | static int cryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb, |
574 | struct cryptd_queue *queue) |
575 | { |
576 | struct hashd_instance_ctx *ctx; |
577 | struct ahash_instance *inst; |
578 | struct shash_alg *salg; |
579 | struct crypto_alg *alg; |
580 | int err; |
581 | |
582 | salg = shash_attr_alg(tb[1], 0, 0); |
583 | if (IS_ERR(salg)) |
584 | return PTR_ERR(salg); |
585 | |
586 | alg = &salg->base; |
587 | inst = cryptd_alloc_instance(alg, ahash_instance_headroom(), |
588 | sizeof(*ctx)); |
589 | err = PTR_ERR(inst); |
590 | if (IS_ERR(inst)) |
591 | goto out_put_alg; |
592 | |
593 | ctx = ahash_instance_ctx(inst); |
594 | ctx->queue = queue; |
595 | |
596 | err = crypto_init_shash_spawn(&ctx->spawn, salg, |
597 | ahash_crypto_instance(inst)); |
598 | if (err) |
599 | goto out_free_inst; |
600 | |
601 | inst->alg.halg.base.cra_flags = CRYPTO_ALG_ASYNC; |
602 | |
603 | inst->alg.halg.digestsize = salg->digestsize; |
604 | inst->alg.halg.base.cra_ctxsize = sizeof(struct cryptd_hash_ctx); |
605 | |
606 | inst->alg.halg.base.cra_init = cryptd_hash_init_tfm; |
607 | inst->alg.halg.base.cra_exit = cryptd_hash_exit_tfm; |
608 | |
609 | inst->alg.init = cryptd_hash_init_enqueue; |
610 | inst->alg.update = cryptd_hash_update_enqueue; |
611 | inst->alg.final = cryptd_hash_final_enqueue; |
612 | inst->alg.finup = cryptd_hash_finup_enqueue; |
613 | inst->alg.export = cryptd_hash_export; |
614 | inst->alg.import = cryptd_hash_import; |
615 | inst->alg.setkey = cryptd_hash_setkey; |
616 | inst->alg.digest = cryptd_hash_digest_enqueue; |
617 | |
618 | err = ahash_register_instance(tmpl, inst); |
619 | if (err) { |
620 | crypto_drop_shash(&ctx->spawn); |
621 | out_free_inst: |
622 | kfree(inst); |
623 | } |
624 | |
625 | out_put_alg: |
626 | crypto_mod_put(alg); |
627 | return err; |
628 | } |
629 | |
630 | static void cryptd_aead_crypt(struct aead_request *req, |
631 | struct crypto_aead *child, |
632 | int err, |
633 | int (*crypt)(struct aead_request *req)) |
634 | { |
635 | struct cryptd_aead_request_ctx *rctx; |
636 | rctx = aead_request_ctx(req); |
637 | |
638 | if (unlikely(err == -EINPROGRESS)) |
639 | goto out; |
640 | aead_request_set_tfm(req, child); |
641 | err = crypt( req ); |
642 | req->base.complete = rctx->complete; |
643 | out: |
644 | local_bh_disable(); |
645 | rctx->complete(&req->base, err); |
646 | local_bh_enable(); |
647 | } |
648 | |
649 | static void cryptd_aead_encrypt(struct crypto_async_request *areq, int err) |
650 | { |
651 | struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm); |
652 | struct crypto_aead *child = ctx->child; |
653 | struct aead_request *req; |
654 | |
655 | req = container_of(areq, struct aead_request, base); |
656 | cryptd_aead_crypt(req, child, err, crypto_aead_crt(child)->encrypt); |
657 | } |
658 | |
659 | static void cryptd_aead_decrypt(struct crypto_async_request *areq, int err) |
660 | { |
661 | struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm); |
662 | struct crypto_aead *child = ctx->child; |
663 | struct aead_request *req; |
664 | |
665 | req = container_of(areq, struct aead_request, base); |
666 | cryptd_aead_crypt(req, child, err, crypto_aead_crt(child)->decrypt); |
667 | } |
668 | |
669 | static int cryptd_aead_enqueue(struct aead_request *req, |
670 | crypto_completion_t complete) |
671 | { |
672 | struct cryptd_aead_request_ctx *rctx = aead_request_ctx(req); |
673 | struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
674 | struct cryptd_queue *queue = cryptd_get_queue(crypto_aead_tfm(tfm)); |
675 | |
676 | rctx->complete = req->base.complete; |
677 | req->base.complete = complete; |
678 | return cryptd_enqueue_request(queue, &req->base); |
679 | } |
680 | |
681 | static int cryptd_aead_encrypt_enqueue(struct aead_request *req) |
682 | { |
683 | return cryptd_aead_enqueue(req, cryptd_aead_encrypt ); |
684 | } |
685 | |
686 | static int cryptd_aead_decrypt_enqueue(struct aead_request *req) |
687 | { |
688 | return cryptd_aead_enqueue(req, cryptd_aead_decrypt ); |
689 | } |
690 | |
691 | static int cryptd_aead_init_tfm(struct crypto_tfm *tfm) |
692 | { |
693 | struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); |
694 | struct aead_instance_ctx *ictx = crypto_instance_ctx(inst); |
695 | struct crypto_aead_spawn *spawn = &ictx->aead_spawn; |
696 | struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(tfm); |
697 | struct crypto_aead *cipher; |
698 | |
699 | cipher = crypto_spawn_aead(spawn); |
700 | if (IS_ERR(cipher)) |
701 | return PTR_ERR(cipher); |
702 | |
703 | crypto_aead_set_flags(cipher, CRYPTO_TFM_REQ_MAY_SLEEP); |
704 | ctx->child = cipher; |
705 | tfm->crt_aead.reqsize = sizeof(struct cryptd_aead_request_ctx); |
706 | return 0; |
707 | } |
708 | |
709 | static void cryptd_aead_exit_tfm(struct crypto_tfm *tfm) |
710 | { |
711 | struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(tfm); |
712 | crypto_free_aead(ctx->child); |
713 | } |
714 | |
715 | static int cryptd_create_aead(struct crypto_template *tmpl, |
716 | struct rtattr **tb, |
717 | struct cryptd_queue *queue) |
718 | { |
719 | struct aead_instance_ctx *ctx; |
720 | struct crypto_instance *inst; |
721 | struct crypto_alg *alg; |
722 | int err; |
723 | |
724 | alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_AEAD, |
725 | CRYPTO_ALG_TYPE_MASK); |
726 | if (IS_ERR(alg)) |
727 | return PTR_ERR(alg); |
728 | |
729 | inst = cryptd_alloc_instance(alg, 0, sizeof(*ctx)); |
730 | err = PTR_ERR(inst); |
731 | if (IS_ERR(inst)) |
732 | goto out_put_alg; |
733 | |
734 | ctx = crypto_instance_ctx(inst); |
735 | ctx->queue = queue; |
736 | |
737 | err = crypto_init_spawn(&ctx->aead_spawn.base, alg, inst, |
738 | CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); |
739 | if (err) |
740 | goto out_free_inst; |
741 | |
742 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC; |
743 | inst->alg.cra_type = alg->cra_type; |
744 | inst->alg.cra_ctxsize = sizeof(struct cryptd_aead_ctx); |
745 | inst->alg.cra_init = cryptd_aead_init_tfm; |
746 | inst->alg.cra_exit = cryptd_aead_exit_tfm; |
747 | inst->alg.cra_aead.setkey = alg->cra_aead.setkey; |
748 | inst->alg.cra_aead.setauthsize = alg->cra_aead.setauthsize; |
749 | inst->alg.cra_aead.geniv = alg->cra_aead.geniv; |
750 | inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize; |
751 | inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize; |
752 | inst->alg.cra_aead.encrypt = cryptd_aead_encrypt_enqueue; |
753 | inst->alg.cra_aead.decrypt = cryptd_aead_decrypt_enqueue; |
754 | inst->alg.cra_aead.givencrypt = alg->cra_aead.givencrypt; |
755 | inst->alg.cra_aead.givdecrypt = alg->cra_aead.givdecrypt; |
756 | |
757 | err = crypto_register_instance(tmpl, inst); |
758 | if (err) { |
759 | crypto_drop_spawn(&ctx->aead_spawn.base); |
760 | out_free_inst: |
761 | kfree(inst); |
762 | } |
763 | out_put_alg: |
764 | crypto_mod_put(alg); |
765 | return err; |
766 | } |
767 | |
768 | static struct cryptd_queue queue; |
769 | |
770 | static int cryptd_create(struct crypto_template *tmpl, struct rtattr **tb) |
771 | { |
772 | struct crypto_attr_type *algt; |
773 | |
774 | algt = crypto_get_attr_type(tb); |
775 | if (IS_ERR(algt)) |
776 | return PTR_ERR(algt); |
777 | |
778 | switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) { |
779 | case CRYPTO_ALG_TYPE_BLKCIPHER: |
780 | return cryptd_create_blkcipher(tmpl, tb, &queue); |
781 | case CRYPTO_ALG_TYPE_DIGEST: |
782 | return cryptd_create_hash(tmpl, tb, &queue); |
783 | case CRYPTO_ALG_TYPE_AEAD: |
784 | return cryptd_create_aead(tmpl, tb, &queue); |
785 | } |
786 | |
787 | return -EINVAL; |
788 | } |
789 | |
790 | static void cryptd_free(struct crypto_instance *inst) |
791 | { |
792 | struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst); |
793 | struct hashd_instance_ctx *hctx = crypto_instance_ctx(inst); |
794 | struct aead_instance_ctx *aead_ctx = crypto_instance_ctx(inst); |
795 | |
796 | switch (inst->alg.cra_flags & CRYPTO_ALG_TYPE_MASK) { |
797 | case CRYPTO_ALG_TYPE_AHASH: |
798 | crypto_drop_shash(&hctx->spawn); |
799 | kfree(ahash_instance(inst)); |
800 | return; |
801 | case CRYPTO_ALG_TYPE_AEAD: |
802 | crypto_drop_spawn(&aead_ctx->aead_spawn.base); |
803 | kfree(inst); |
804 | return; |
805 | default: |
806 | crypto_drop_spawn(&ctx->spawn); |
807 | kfree(inst); |
808 | } |
809 | } |
810 | |
811 | static struct crypto_template cryptd_tmpl = { |
812 | .name = "cryptd", |
813 | .create = cryptd_create, |
814 | .free = cryptd_free, |
815 | .module = THIS_MODULE, |
816 | }; |
817 | |
818 | struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name, |
819 | u32 type, u32 mask) |
820 | { |
821 | char cryptd_alg_name[CRYPTO_MAX_ALG_NAME]; |
822 | struct crypto_tfm *tfm; |
823 | |
824 | if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME, |
825 | "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME) |
826 | return ERR_PTR(-EINVAL); |
827 | type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV); |
828 | type |= CRYPTO_ALG_TYPE_BLKCIPHER; |
829 | mask &= ~CRYPTO_ALG_TYPE_MASK; |
830 | mask |= (CRYPTO_ALG_GENIV | CRYPTO_ALG_TYPE_BLKCIPHER_MASK); |
831 | tfm = crypto_alloc_base(cryptd_alg_name, type, mask); |
832 | if (IS_ERR(tfm)) |
833 | return ERR_CAST(tfm); |
834 | if (tfm->__crt_alg->cra_module != THIS_MODULE) { |
835 | crypto_free_tfm(tfm); |
836 | return ERR_PTR(-EINVAL); |
837 | } |
838 | |
839 | return __cryptd_ablkcipher_cast(__crypto_ablkcipher_cast(tfm)); |
840 | } |
841 | EXPORT_SYMBOL_GPL(cryptd_alloc_ablkcipher); |
842 | |
843 | struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm) |
844 | { |
845 | struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base); |
846 | return ctx->child; |
847 | } |
848 | EXPORT_SYMBOL_GPL(cryptd_ablkcipher_child); |
849 | |
850 | void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm) |
851 | { |
852 | crypto_free_ablkcipher(&tfm->base); |
853 | } |
854 | EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher); |
855 | |
856 | struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name, |
857 | u32 type, u32 mask) |
858 | { |
859 | char cryptd_alg_name[CRYPTO_MAX_ALG_NAME]; |
860 | struct crypto_ahash *tfm; |
861 | |
862 | if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME, |
863 | "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME) |
864 | return ERR_PTR(-EINVAL); |
865 | tfm = crypto_alloc_ahash(cryptd_alg_name, type, mask); |
866 | if (IS_ERR(tfm)) |
867 | return ERR_CAST(tfm); |
868 | if (tfm->base.__crt_alg->cra_module != THIS_MODULE) { |
869 | crypto_free_ahash(tfm); |
870 | return ERR_PTR(-EINVAL); |
871 | } |
872 | |
873 | return __cryptd_ahash_cast(tfm); |
874 | } |
875 | EXPORT_SYMBOL_GPL(cryptd_alloc_ahash); |
876 | |
877 | struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm) |
878 | { |
879 | struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base); |
880 | |
881 | return ctx->child; |
882 | } |
883 | EXPORT_SYMBOL_GPL(cryptd_ahash_child); |
884 | |
885 | struct shash_desc *cryptd_shash_desc(struct ahash_request *req) |
886 | { |
887 | struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); |
888 | return &rctx->desc; |
889 | } |
890 | EXPORT_SYMBOL_GPL(cryptd_shash_desc); |
891 | |
892 | void cryptd_free_ahash(struct cryptd_ahash *tfm) |
893 | { |
894 | crypto_free_ahash(&tfm->base); |
895 | } |
896 | EXPORT_SYMBOL_GPL(cryptd_free_ahash); |
897 | |
898 | struct cryptd_aead *cryptd_alloc_aead(const char *alg_name, |
899 | u32 type, u32 mask) |
900 | { |
901 | char cryptd_alg_name[CRYPTO_MAX_ALG_NAME]; |
902 | struct crypto_aead *tfm; |
903 | |
904 | if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME, |
905 | "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME) |
906 | return ERR_PTR(-EINVAL); |
907 | tfm = crypto_alloc_aead(cryptd_alg_name, type, mask); |
908 | if (IS_ERR(tfm)) |
909 | return ERR_CAST(tfm); |
910 | if (tfm->base.__crt_alg->cra_module != THIS_MODULE) { |
911 | crypto_free_aead(tfm); |
912 | return ERR_PTR(-EINVAL); |
913 | } |
914 | return __cryptd_aead_cast(tfm); |
915 | } |
916 | EXPORT_SYMBOL_GPL(cryptd_alloc_aead); |
917 | |
918 | struct crypto_aead *cryptd_aead_child(struct cryptd_aead *tfm) |
919 | { |
920 | struct cryptd_aead_ctx *ctx; |
921 | ctx = crypto_aead_ctx(&tfm->base); |
922 | return ctx->child; |
923 | } |
924 | EXPORT_SYMBOL_GPL(cryptd_aead_child); |
925 | |
926 | void cryptd_free_aead(struct cryptd_aead *tfm) |
927 | { |
928 | crypto_free_aead(&tfm->base); |
929 | } |
930 | EXPORT_SYMBOL_GPL(cryptd_free_aead); |
931 | |
932 | static int __init cryptd_init(void) |
933 | { |
934 | int err; |
935 | |
936 | err = cryptd_init_queue(&queue, CRYPTD_MAX_CPU_QLEN); |
937 | if (err) |
938 | return err; |
939 | |
940 | err = crypto_register_template(&cryptd_tmpl); |
941 | if (err) |
942 | cryptd_fini_queue(&queue); |
943 | |
944 | return err; |
945 | } |
946 | |
947 | static void __exit cryptd_exit(void) |
948 | { |
949 | cryptd_fini_queue(&queue); |
950 | crypto_unregister_template(&cryptd_tmpl); |
951 | } |
952 | |
953 | subsys_initcall(cryptd_init); |
954 | module_exit(cryptd_exit); |
955 | |
956 | MODULE_LICENSE("GPL"); |
957 | MODULE_DESCRIPTION("Software async crypto daemon"); |
958 |
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