1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* Algorithms supported by virtio crypto device
3 *
4 * Authors: Gonglei <arei.gonglei@huawei.com>
5 *
6 * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
7 */
8
9 #include <crypto/engine.h>
10 #include <crypto/internal/skcipher.h>
11 #include <crypto/scatterwalk.h>
12 #include <linux/err.h>
13 #include <linux/scatterlist.h>
14 #include <uapi/linux/virtio_crypto.h>
15 #include "virtio_crypto_common.h"
16
17
18 struct virtio_crypto_skcipher_ctx {
19 struct virtio_crypto *vcrypto;
20
21 struct virtio_crypto_sym_session_info enc_sess_info;
22 struct virtio_crypto_sym_session_info dec_sess_info;
23 };
24
25 struct virtio_crypto_sym_request {
26 struct virtio_crypto_request base;
27
28 /* Cipher or aead */
29 uint32_t type;
30 uint8_t *iv;
31 /* Encryption? */
32 bool encrypt;
33 };
34
35 struct virtio_crypto_algo {
36 uint32_t algonum;
37 uint32_t service;
38 unsigned int active_devs;
39 struct skcipher_engine_alg algo;
40 };
41
42 /*
43 * The algs_lock protects the below global virtio_crypto_active_devs
44 * and crypto algorithms registion.
45 */
46 static DEFINE_MUTEX(algs_lock);
47 static void virtio_crypto_skcipher_finalize_req(
48 struct virtio_crypto_sym_request *vc_sym_req,
49 struct skcipher_request *req,
50 int err);
51
virtio_crypto_dataq_sym_callback(struct virtio_crypto_request * vc_req,int len)52 static void virtio_crypto_dataq_sym_callback
53 (struct virtio_crypto_request *vc_req, int len)
54 {
55 struct virtio_crypto_sym_request *vc_sym_req =
56 container_of(vc_req, struct virtio_crypto_sym_request, base);
57 struct skcipher_request *ablk_req =
58 container_of((void *)vc_sym_req, struct skcipher_request,
59 __ctx);
60 int error;
61
62 /* Finish the encrypt or decrypt process */
63 if (vc_sym_req->type == VIRTIO_CRYPTO_SYM_OP_CIPHER) {
64 switch (vc_req->status) {
65 case VIRTIO_CRYPTO_OK:
66 error = 0;
67 break;
68 case VIRTIO_CRYPTO_INVSESS:
69 case VIRTIO_CRYPTO_ERR:
70 error = -EINVAL;
71 break;
72 case VIRTIO_CRYPTO_BADMSG:
73 error = -EBADMSG;
74 break;
75 default:
76 error = -EIO;
77 break;
78 }
79 virtio_crypto_skcipher_finalize_req(vc_sym_req,
80 ablk_req, error);
81 }
82 }
83
virtio_crypto_alg_sg_nents_length(struct scatterlist * sg)84 static u64 virtio_crypto_alg_sg_nents_length(struct scatterlist *sg)
85 {
86 u64 total = 0;
87
88 for (total = 0; sg; sg = sg_next(sg))
89 total += sg->length;
90
91 return total;
92 }
93
94 static int
virtio_crypto_alg_validate_key(int key_len,uint32_t * alg)95 virtio_crypto_alg_validate_key(int key_len, uint32_t *alg)
96 {
97 switch (key_len) {
98 case AES_KEYSIZE_128:
99 case AES_KEYSIZE_192:
100 case AES_KEYSIZE_256:
101 *alg = VIRTIO_CRYPTO_CIPHER_AES_CBC;
102 break;
103 default:
104 return -EINVAL;
105 }
106 return 0;
107 }
108
virtio_crypto_alg_skcipher_init_session(struct virtio_crypto_skcipher_ctx * ctx,uint32_t alg,const uint8_t * key,unsigned int keylen,int encrypt)109 static int virtio_crypto_alg_skcipher_init_session(
110 struct virtio_crypto_skcipher_ctx *ctx,
111 uint32_t alg, const uint8_t *key,
112 unsigned int keylen,
113 int encrypt)
114 {
115 struct scatterlist outhdr, key_sg, inhdr, *sgs[3];
116 struct virtio_crypto *vcrypto = ctx->vcrypto;
117 int op = encrypt ? VIRTIO_CRYPTO_OP_ENCRYPT : VIRTIO_CRYPTO_OP_DECRYPT;
118 int err;
119 unsigned int num_out = 0, num_in = 0;
120 struct virtio_crypto_op_ctrl_req *ctrl;
121 struct virtio_crypto_session_input *input;
122 struct virtio_crypto_sym_create_session_req *sym_create_session;
123 struct virtio_crypto_ctrl_request *vc_ctrl_req;
124
125 /*
126 * Avoid to do DMA from the stack, switch to using
127 * dynamically-allocated for the key
128 */
129 uint8_t *cipher_key = kmemdup(key, keylen, GFP_ATOMIC);
130
131 if (!cipher_key)
132 return -ENOMEM;
133
134 vc_ctrl_req = kzalloc_obj(*vc_ctrl_req);
135 if (!vc_ctrl_req) {
136 err = -ENOMEM;
137 goto out;
138 }
139
140 /* Pad ctrl header */
141 ctrl = &vc_ctrl_req->ctrl;
142 ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION);
143 ctrl->header.algo = cpu_to_le32(alg);
144 /* Set the default dataqueue id to 0 */
145 ctrl->header.queue_id = 0;
146
147 input = &vc_ctrl_req->input;
148 input->status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
149 /* Pad cipher's parameters */
150 sym_create_session = &ctrl->u.sym_create_session;
151 sym_create_session->op_type = cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
152 sym_create_session->u.cipher.para.algo = ctrl->header.algo;
153 sym_create_session->u.cipher.para.keylen = cpu_to_le32(keylen);
154 sym_create_session->u.cipher.para.op = cpu_to_le32(op);
155
156 sg_init_one(&outhdr, ctrl, sizeof(*ctrl));
157 sgs[num_out++] = &outhdr;
158
159 /* Set key */
160 sg_init_one(&key_sg, cipher_key, keylen);
161 sgs[num_out++] = &key_sg;
162
163 /* Return status and session id back */
164 sg_init_one(&inhdr, input, sizeof(*input));
165 sgs[num_out + num_in++] = &inhdr;
166
167 err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in, vc_ctrl_req);
168 if (err < 0)
169 goto out;
170
171 if (le32_to_cpu(input->status) != VIRTIO_CRYPTO_OK) {
172 pr_err("virtio_crypto: Create session failed status: %u\n",
173 le32_to_cpu(input->status));
174 err = -EINVAL;
175 goto out;
176 }
177
178 if (encrypt)
179 ctx->enc_sess_info.session_id = le64_to_cpu(input->session_id);
180 else
181 ctx->dec_sess_info.session_id = le64_to_cpu(input->session_id);
182
183 err = 0;
184 out:
185 kfree(vc_ctrl_req);
186 kfree_sensitive(cipher_key);
187 return err;
188 }
189
virtio_crypto_alg_skcipher_close_session(struct virtio_crypto_skcipher_ctx * ctx,int encrypt)190 static int virtio_crypto_alg_skcipher_close_session(
191 struct virtio_crypto_skcipher_ctx *ctx,
192 int encrypt)
193 {
194 struct scatterlist outhdr, status_sg, *sgs[2];
195 struct virtio_crypto_destroy_session_req *destroy_session;
196 struct virtio_crypto *vcrypto = ctx->vcrypto;
197 int err;
198 unsigned int num_out = 0, num_in = 0;
199 struct virtio_crypto_op_ctrl_req *ctrl;
200 struct virtio_crypto_inhdr *ctrl_status;
201 struct virtio_crypto_ctrl_request *vc_ctrl_req;
202
203 vc_ctrl_req = kzalloc_obj(*vc_ctrl_req);
204 if (!vc_ctrl_req)
205 return -ENOMEM;
206
207 ctrl_status = &vc_ctrl_req->ctrl_status;
208 ctrl_status->status = VIRTIO_CRYPTO_ERR;
209 /* Pad ctrl header */
210 ctrl = &vc_ctrl_req->ctrl;
211 ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION);
212 /* Set the default virtqueue id to 0 */
213 ctrl->header.queue_id = 0;
214
215 destroy_session = &ctrl->u.destroy_session;
216
217 if (encrypt)
218 destroy_session->session_id = cpu_to_le64(ctx->enc_sess_info.session_id);
219 else
220 destroy_session->session_id = cpu_to_le64(ctx->dec_sess_info.session_id);
221
222 sg_init_one(&outhdr, ctrl, sizeof(*ctrl));
223 sgs[num_out++] = &outhdr;
224
225 /* Return status and session id back */
226 sg_init_one(&status_sg, &ctrl_status->status, sizeof(ctrl_status->status));
227 sgs[num_out + num_in++] = &status_sg;
228
229 err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in, vc_ctrl_req);
230 if (err < 0)
231 goto out;
232
233 if (ctrl_status->status != VIRTIO_CRYPTO_OK) {
234 pr_err("virtio_crypto: Close session failed status: %u, session_id: 0x%llx\n",
235 ctrl_status->status,
236 le64_to_cpu(destroy_session->session_id));
237
238 err = -EINVAL;
239 goto out;
240 }
241
242 err = 0;
243 out:
244 kfree(vc_ctrl_req);
245 return err;
246 }
247
virtio_crypto_alg_skcipher_init_sessions(struct virtio_crypto_skcipher_ctx * ctx,const uint8_t * key,unsigned int keylen)248 static int virtio_crypto_alg_skcipher_init_sessions(
249 struct virtio_crypto_skcipher_ctx *ctx,
250 const uint8_t *key, unsigned int keylen)
251 {
252 uint32_t alg;
253 int ret;
254 struct virtio_crypto *vcrypto = ctx->vcrypto;
255
256 if (keylen > vcrypto->max_cipher_key_len) {
257 pr_err("virtio_crypto: the key is too long\n");
258 return -EINVAL;
259 }
260
261 if (virtio_crypto_alg_validate_key(keylen, &alg))
262 return -EINVAL;
263
264 /* Create encryption session */
265 ret = virtio_crypto_alg_skcipher_init_session(ctx,
266 alg, key, keylen, 1);
267 if (ret)
268 return ret;
269 /* Create decryption session */
270 ret = virtio_crypto_alg_skcipher_init_session(ctx,
271 alg, key, keylen, 0);
272 if (ret) {
273 virtio_crypto_alg_skcipher_close_session(ctx, 1);
274 return ret;
275 }
276 return 0;
277 }
278
279 /* Note: kernel crypto API realization */
virtio_crypto_skcipher_setkey(struct crypto_skcipher * tfm,const uint8_t * key,unsigned int keylen)280 static int virtio_crypto_skcipher_setkey(struct crypto_skcipher *tfm,
281 const uint8_t *key,
282 unsigned int keylen)
283 {
284 struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
285 uint32_t alg;
286 int ret;
287
288 ret = virtio_crypto_alg_validate_key(keylen, &alg);
289 if (ret)
290 return ret;
291
292 if (!ctx->vcrypto) {
293 /* New key */
294 int node = virtio_crypto_get_current_node();
295 struct virtio_crypto *vcrypto =
296 virtcrypto_get_dev_node(node,
297 VIRTIO_CRYPTO_SERVICE_CIPHER, alg);
298 if (!vcrypto) {
299 pr_err("virtio_crypto: Could not find a virtio device in the system or unsupported algo\n");
300 return -ENODEV;
301 }
302
303 ctx->vcrypto = vcrypto;
304 } else {
305 /* Rekeying, we should close the created sessions previously */
306 virtio_crypto_alg_skcipher_close_session(ctx, 1);
307 virtio_crypto_alg_skcipher_close_session(ctx, 0);
308 }
309
310 ret = virtio_crypto_alg_skcipher_init_sessions(ctx, key, keylen);
311 if (ret) {
312 virtcrypto_dev_put(ctx->vcrypto);
313 ctx->vcrypto = NULL;
314
315 return ret;
316 }
317
318 return 0;
319 }
320
321 static int
__virtio_crypto_skcipher_do_req(struct virtio_crypto_sym_request * vc_sym_req,struct skcipher_request * req,struct data_queue * data_vq)322 __virtio_crypto_skcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req,
323 struct skcipher_request *req,
324 struct data_queue *data_vq)
325 {
326 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
327 struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
328 struct virtio_crypto_request *vc_req = &vc_sym_req->base;
329 unsigned int ivsize = crypto_skcipher_ivsize(tfm);
330 struct virtio_crypto *vcrypto = ctx->vcrypto;
331 struct virtio_crypto_op_data_req *req_data;
332 int src_nents, dst_nents;
333 int err;
334 unsigned long flags;
335 struct scatterlist outhdr, iv_sg, status_sg, **sgs;
336 u64 dst_len;
337 unsigned int num_out = 0, num_in = 0;
338 int sg_total;
339 uint8_t *iv;
340 struct scatterlist *sg;
341
342 src_nents = sg_nents_for_len(req->src, req->cryptlen);
343 if (src_nents < 0) {
344 pr_err("Invalid number of src SG.\n");
345 return src_nents;
346 }
347
348 dst_nents = sg_nents(req->dst);
349
350 pr_debug("virtio_crypto: Number of sgs (src_nents: %d, dst_nents: %d)\n",
351 src_nents, dst_nents);
352
353 /* Why 3? outhdr + iv + inhdr */
354 sg_total = src_nents + dst_nents + 3;
355 sgs = kcalloc_node(sg_total, sizeof(*sgs), GFP_KERNEL,
356 dev_to_node(&vcrypto->vdev->dev));
357 if (!sgs)
358 return -ENOMEM;
359
360 req_data = kzalloc_node(sizeof(*req_data), GFP_KERNEL,
361 dev_to_node(&vcrypto->vdev->dev));
362 if (!req_data) {
363 kfree(sgs);
364 return -ENOMEM;
365 }
366
367 vc_req->req_data = req_data;
368 vc_sym_req->type = VIRTIO_CRYPTO_SYM_OP_CIPHER;
369 /* Head of operation */
370 if (vc_sym_req->encrypt) {
371 req_data->header.session_id =
372 cpu_to_le64(ctx->enc_sess_info.session_id);
373 req_data->header.opcode =
374 cpu_to_le32(VIRTIO_CRYPTO_CIPHER_ENCRYPT);
375 } else {
376 req_data->header.session_id =
377 cpu_to_le64(ctx->dec_sess_info.session_id);
378 req_data->header.opcode =
379 cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DECRYPT);
380 }
381 req_data->u.sym_req.op_type = cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
382 req_data->u.sym_req.u.cipher.para.iv_len = cpu_to_le32(ivsize);
383 req_data->u.sym_req.u.cipher.para.src_data_len =
384 cpu_to_le32(req->cryptlen);
385
386 dst_len = virtio_crypto_alg_sg_nents_length(req->dst);
387 if (unlikely(dst_len > U32_MAX)) {
388 pr_err("virtio_crypto: The dst_len is beyond U32_MAX\n");
389 err = -EINVAL;
390 goto free;
391 }
392
393 dst_len = min_t(unsigned int, req->cryptlen, dst_len);
394 pr_debug("virtio_crypto: src_len: %u, dst_len: %llu\n",
395 req->cryptlen, dst_len);
396
397 if (unlikely(req->cryptlen + dst_len + ivsize +
398 sizeof(vc_req->status) > vcrypto->max_size)) {
399 pr_err("virtio_crypto: The length is too big\n");
400 err = -EINVAL;
401 goto free;
402 }
403
404 req_data->u.sym_req.u.cipher.para.dst_data_len =
405 cpu_to_le32((uint32_t)dst_len);
406
407 /* Outhdr */
408 sg_init_one(&outhdr, req_data, sizeof(*req_data));
409 sgs[num_out++] = &outhdr;
410
411 /* IV */
412
413 /*
414 * Avoid to do DMA from the stack, switch to using
415 * dynamically-allocated for the IV
416 */
417 iv = kzalloc_node(ivsize, GFP_ATOMIC,
418 dev_to_node(&vcrypto->vdev->dev));
419 if (!iv) {
420 err = -ENOMEM;
421 goto free;
422 }
423 memcpy(iv, req->iv, ivsize);
424 if (!vc_sym_req->encrypt)
425 scatterwalk_map_and_copy(req->iv, req->src,
426 req->cryptlen - AES_BLOCK_SIZE,
427 AES_BLOCK_SIZE, 0);
428
429 sg_init_one(&iv_sg, iv, ivsize);
430 sgs[num_out++] = &iv_sg;
431 vc_sym_req->iv = iv;
432
433 /* Source data */
434 for (sg = req->src; src_nents; sg = sg_next(sg), src_nents--)
435 sgs[num_out++] = sg;
436
437 /* Destination data */
438 for (sg = req->dst; sg; sg = sg_next(sg))
439 sgs[num_out + num_in++] = sg;
440
441 /* Status */
442 sg_init_one(&status_sg, &vc_req->status, sizeof(vc_req->status));
443 sgs[num_out + num_in++] = &status_sg;
444
445 vc_req->sgs = sgs;
446
447 spin_lock_irqsave(&data_vq->lock, flags);
448 err = virtqueue_add_sgs(data_vq->vq, sgs, num_out,
449 num_in, vc_req, GFP_ATOMIC);
450 virtqueue_kick(data_vq->vq);
451 spin_unlock_irqrestore(&data_vq->lock, flags);
452 if (unlikely(err < 0))
453 goto free_iv;
454
455 return 0;
456
457 free_iv:
458 kfree_sensitive(iv);
459 free:
460 kfree_sensitive(req_data);
461 kfree(sgs);
462 return err;
463 }
464
virtio_crypto_skcipher_encrypt(struct skcipher_request * req)465 static int virtio_crypto_skcipher_encrypt(struct skcipher_request *req)
466 {
467 struct crypto_skcipher *atfm = crypto_skcipher_reqtfm(req);
468 struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(atfm);
469 struct virtio_crypto_sym_request *vc_sym_req =
470 skcipher_request_ctx(req);
471 struct virtio_crypto_request *vc_req = &vc_sym_req->base;
472 struct virtio_crypto *vcrypto = ctx->vcrypto;
473 /* Use the first data virtqueue as default */
474 struct data_queue *data_vq = &vcrypto->data_vq[0];
475
476 if (!req->cryptlen)
477 return 0;
478 if (req->cryptlen % AES_BLOCK_SIZE)
479 return -EINVAL;
480
481 vc_req->dataq = data_vq;
482 vc_req->alg_cb = virtio_crypto_dataq_sym_callback;
483 vc_sym_req->encrypt = true;
484
485 return crypto_transfer_skcipher_request_to_engine(data_vq->engine, req);
486 }
487
virtio_crypto_skcipher_decrypt(struct skcipher_request * req)488 static int virtio_crypto_skcipher_decrypt(struct skcipher_request *req)
489 {
490 struct crypto_skcipher *atfm = crypto_skcipher_reqtfm(req);
491 struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(atfm);
492 struct virtio_crypto_sym_request *vc_sym_req =
493 skcipher_request_ctx(req);
494 struct virtio_crypto_request *vc_req = &vc_sym_req->base;
495 struct virtio_crypto *vcrypto = ctx->vcrypto;
496 /* Use the first data virtqueue as default */
497 struct data_queue *data_vq = &vcrypto->data_vq[0];
498
499 if (!req->cryptlen)
500 return 0;
501 if (req->cryptlen % AES_BLOCK_SIZE)
502 return -EINVAL;
503
504 vc_req->dataq = data_vq;
505 vc_req->alg_cb = virtio_crypto_dataq_sym_callback;
506 vc_sym_req->encrypt = false;
507
508 return crypto_transfer_skcipher_request_to_engine(data_vq->engine, req);
509 }
510
virtio_crypto_skcipher_init(struct crypto_skcipher * tfm)511 static int virtio_crypto_skcipher_init(struct crypto_skcipher *tfm)
512 {
513 crypto_skcipher_set_reqsize(tfm, sizeof(struct virtio_crypto_sym_request));
514
515 return 0;
516 }
517
virtio_crypto_skcipher_exit(struct crypto_skcipher * tfm)518 static void virtio_crypto_skcipher_exit(struct crypto_skcipher *tfm)
519 {
520 struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
521
522 if (!ctx->vcrypto)
523 return;
524
525 virtio_crypto_alg_skcipher_close_session(ctx, 1);
526 virtio_crypto_alg_skcipher_close_session(ctx, 0);
527 virtcrypto_dev_put(ctx->vcrypto);
528 ctx->vcrypto = NULL;
529 }
530
virtio_crypto_skcipher_crypt_req(struct crypto_engine * engine,void * vreq)531 int virtio_crypto_skcipher_crypt_req(
532 struct crypto_engine *engine, void *vreq)
533 {
534 struct skcipher_request *req = container_of(vreq, struct skcipher_request, base);
535 struct virtio_crypto_sym_request *vc_sym_req =
536 skcipher_request_ctx(req);
537 struct virtio_crypto_request *vc_req = &vc_sym_req->base;
538 struct data_queue *data_vq = vc_req->dataq;
539 int ret;
540
541 ret = __virtio_crypto_skcipher_do_req(vc_sym_req, req, data_vq);
542 if (ret < 0)
543 return ret;
544
545 return 0;
546 }
547
virtio_crypto_skcipher_finalize_req(struct virtio_crypto_sym_request * vc_sym_req,struct skcipher_request * req,int err)548 static void virtio_crypto_skcipher_finalize_req(
549 struct virtio_crypto_sym_request *vc_sym_req,
550 struct skcipher_request *req,
551 int err)
552 {
553 if (vc_sym_req->encrypt)
554 scatterwalk_map_and_copy(req->iv, req->dst,
555 req->cryptlen - AES_BLOCK_SIZE,
556 AES_BLOCK_SIZE, 0);
557 kfree_sensitive(vc_sym_req->iv);
558 virtcrypto_clear_request(&vc_sym_req->base);
559
560 crypto_finalize_skcipher_request(vc_sym_req->base.dataq->engine,
561 req, err);
562 }
563
564 static struct virtio_crypto_algo virtio_crypto_algs[] = { {
565 .algonum = VIRTIO_CRYPTO_CIPHER_AES_CBC,
566 .service = VIRTIO_CRYPTO_SERVICE_CIPHER,
567 .algo.base = {
568 .base.cra_name = "cbc(aes)",
569 .base.cra_driver_name = "virtio_crypto_aes_cbc",
570 .base.cra_priority = 150,
571 .base.cra_flags = CRYPTO_ALG_ASYNC |
572 CRYPTO_ALG_ALLOCATES_MEMORY,
573 .base.cra_blocksize = AES_BLOCK_SIZE,
574 .base.cra_ctxsize = sizeof(struct virtio_crypto_skcipher_ctx),
575 .base.cra_module = THIS_MODULE,
576 .init = virtio_crypto_skcipher_init,
577 .exit = virtio_crypto_skcipher_exit,
578 .setkey = virtio_crypto_skcipher_setkey,
579 .decrypt = virtio_crypto_skcipher_decrypt,
580 .encrypt = virtio_crypto_skcipher_encrypt,
581 .min_keysize = AES_MIN_KEY_SIZE,
582 .max_keysize = AES_MAX_KEY_SIZE,
583 .ivsize = AES_BLOCK_SIZE,
584 },
585 .algo.op = {
586 .do_one_request = virtio_crypto_skcipher_crypt_req,
587 },
588 } };
589
virtio_crypto_skcipher_algs_register(struct virtio_crypto * vcrypto)590 int virtio_crypto_skcipher_algs_register(struct virtio_crypto *vcrypto)
591 {
592 int ret = 0;
593 int i = 0;
594
595 mutex_lock(&algs_lock);
596
597 for (i = 0; i < ARRAY_SIZE(virtio_crypto_algs); i++) {
598
599 uint32_t service = virtio_crypto_algs[i].service;
600 uint32_t algonum = virtio_crypto_algs[i].algonum;
601
602 if (!virtcrypto_algo_is_supported(vcrypto, service, algonum))
603 continue;
604
605 if (virtio_crypto_algs[i].active_devs == 0) {
606 ret = crypto_engine_register_skcipher(&virtio_crypto_algs[i].algo);
607 if (ret)
608 goto unlock;
609 }
610
611 virtio_crypto_algs[i].active_devs++;
612 dev_info(&vcrypto->vdev->dev, "Registered algo %s\n",
613 virtio_crypto_algs[i].algo.base.base.cra_name);
614 }
615
616 unlock:
617 mutex_unlock(&algs_lock);
618 return ret;
619 }
620
virtio_crypto_skcipher_algs_unregister(struct virtio_crypto * vcrypto)621 void virtio_crypto_skcipher_algs_unregister(struct virtio_crypto *vcrypto)
622 {
623 int i = 0;
624
625 mutex_lock(&algs_lock);
626
627 for (i = 0; i < ARRAY_SIZE(virtio_crypto_algs); i++) {
628
629 uint32_t service = virtio_crypto_algs[i].service;
630 uint32_t algonum = virtio_crypto_algs[i].algonum;
631
632 if (virtio_crypto_algs[i].active_devs == 0 ||
633 !virtcrypto_algo_is_supported(vcrypto, service, algonum))
634 continue;
635
636 if (virtio_crypto_algs[i].active_devs == 1)
637 crypto_engine_unregister_skcipher(&virtio_crypto_algs[i].algo);
638
639 virtio_crypto_algs[i].active_devs--;
640 }
641
642 mutex_unlock(&algs_lock);
643 }
644