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 <linux/scatterlist.h> 10 #include <crypto/algapi.h> 11 #include <crypto/internal/skcipher.h> 12 #include <linux/err.h> 13 #include <crypto/scatterwalk.h> 14 #include <linux/atomic.h> 15 16 #include <uapi/linux/virtio_crypto.h> 17 #include "virtio_crypto_common.h" 18 19 20 struct virtio_crypto_skcipher_ctx { 21 struct crypto_engine_ctx enginectx; 22 struct virtio_crypto *vcrypto; 23 struct crypto_skcipher *tfm; 24 25 struct virtio_crypto_sym_session_info enc_sess_info; 26 struct virtio_crypto_sym_session_info dec_sess_info; 27 }; 28 29 struct virtio_crypto_sym_request { 30 struct virtio_crypto_request base; 31 32 /* Cipher or aead */ 33 uint32_t type; 34 struct virtio_crypto_skcipher_ctx *skcipher_ctx; 35 struct skcipher_request *skcipher_req; 36 uint8_t *iv; 37 /* Encryption? */ 38 bool encrypt; 39 }; 40 41 struct virtio_crypto_algo { 42 uint32_t algonum; 43 uint32_t service; 44 unsigned int active_devs; 45 struct skcipher_alg algo; 46 }; 47 48 /* 49 * The algs_lock protects the below global virtio_crypto_active_devs 50 * and crypto algorithms registion. 51 */ 52 static DEFINE_MUTEX(algs_lock); 53 static void virtio_crypto_skcipher_finalize_req( 54 struct virtio_crypto_sym_request *vc_sym_req, 55 struct skcipher_request *req, 56 int err); 57 58 static void virtio_crypto_dataq_sym_callback 59 (struct virtio_crypto_request *vc_req, int len) 60 { 61 struct virtio_crypto_sym_request *vc_sym_req = 62 container_of(vc_req, struct virtio_crypto_sym_request, base); 63 struct skcipher_request *ablk_req; 64 int error; 65 66 /* Finish the encrypt or decrypt process */ 67 if (vc_sym_req->type == VIRTIO_CRYPTO_SYM_OP_CIPHER) { 68 switch (vc_req->status) { 69 case VIRTIO_CRYPTO_OK: 70 error = 0; 71 break; 72 case VIRTIO_CRYPTO_INVSESS: 73 case VIRTIO_CRYPTO_ERR: 74 error = -EINVAL; 75 break; 76 case VIRTIO_CRYPTO_BADMSG: 77 error = -EBADMSG; 78 break; 79 default: 80 error = -EIO; 81 break; 82 } 83 ablk_req = vc_sym_req->skcipher_req; 84 virtio_crypto_skcipher_finalize_req(vc_sym_req, 85 ablk_req, error); 86 } 87 } 88 89 static u64 virtio_crypto_alg_sg_nents_length(struct scatterlist *sg) 90 { 91 u64 total = 0; 92 93 for (total = 0; sg; sg = sg_next(sg)) 94 total += sg->length; 95 96 return total; 97 } 98 99 static int 100 virtio_crypto_alg_validate_key(int key_len, uint32_t *alg) 101 { 102 switch (key_len) { 103 case AES_KEYSIZE_128: 104 case AES_KEYSIZE_192: 105 case AES_KEYSIZE_256: 106 *alg = VIRTIO_CRYPTO_CIPHER_AES_CBC; 107 break; 108 default: 109 return -EINVAL; 110 } 111 return 0; 112 } 113 114 static int virtio_crypto_alg_skcipher_init_session( 115 struct virtio_crypto_skcipher_ctx *ctx, 116 uint32_t alg, const uint8_t *key, 117 unsigned int keylen, 118 int encrypt) 119 { 120 struct scatterlist outhdr, key_sg, inhdr, *sgs[3]; 121 struct virtio_crypto *vcrypto = ctx->vcrypto; 122 int op = encrypt ? VIRTIO_CRYPTO_OP_ENCRYPT : VIRTIO_CRYPTO_OP_DECRYPT; 123 int err; 124 unsigned int num_out = 0, num_in = 0; 125 struct virtio_crypto_op_ctrl_req *ctrl; 126 struct virtio_crypto_session_input *input; 127 struct virtio_crypto_sym_create_session_req *sym_create_session; 128 struct virtio_crypto_ctrl_request *vc_ctrl_req; 129 130 /* 131 * Avoid to do DMA from the stack, switch to using 132 * dynamically-allocated for the key 133 */ 134 uint8_t *cipher_key = kmemdup(key, keylen, GFP_ATOMIC); 135 136 if (!cipher_key) 137 return -ENOMEM; 138 139 vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL); 140 if (!vc_ctrl_req) { 141 err = -ENOMEM; 142 goto out; 143 } 144 145 /* Pad ctrl header */ 146 ctrl = &vc_ctrl_req->ctrl; 147 ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION); 148 ctrl->header.algo = cpu_to_le32(alg); 149 /* Set the default dataqueue id to 0 */ 150 ctrl->header.queue_id = 0; 151 152 input = &vc_ctrl_req->input; 153 input->status = cpu_to_le32(VIRTIO_CRYPTO_ERR); 154 /* Pad cipher's parameters */ 155 sym_create_session = &ctrl->u.sym_create_session; 156 sym_create_session->op_type = cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER); 157 sym_create_session->u.cipher.para.algo = ctrl->header.algo; 158 sym_create_session->u.cipher.para.keylen = cpu_to_le32(keylen); 159 sym_create_session->u.cipher.para.op = cpu_to_le32(op); 160 161 sg_init_one(&outhdr, ctrl, sizeof(*ctrl)); 162 sgs[num_out++] = &outhdr; 163 164 /* Set key */ 165 sg_init_one(&key_sg, cipher_key, keylen); 166 sgs[num_out++] = &key_sg; 167 168 /* Return status and session id back */ 169 sg_init_one(&inhdr, input, sizeof(*input)); 170 sgs[num_out + num_in++] = &inhdr; 171 172 err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in, vc_ctrl_req); 173 if (err < 0) 174 goto out; 175 176 if (le32_to_cpu(input->status) != VIRTIO_CRYPTO_OK) { 177 pr_err("virtio_crypto: Create session failed status: %u\n", 178 le32_to_cpu(input->status)); 179 err = -EINVAL; 180 goto out; 181 } 182 183 if (encrypt) 184 ctx->enc_sess_info.session_id = le64_to_cpu(input->session_id); 185 else 186 ctx->dec_sess_info.session_id = le64_to_cpu(input->session_id); 187 188 err = 0; 189 out: 190 kfree(vc_ctrl_req); 191 kfree_sensitive(cipher_key); 192 return err; 193 } 194 195 static int virtio_crypto_alg_skcipher_close_session( 196 struct virtio_crypto_skcipher_ctx *ctx, 197 int encrypt) 198 { 199 struct scatterlist outhdr, status_sg, *sgs[2]; 200 struct virtio_crypto_destroy_session_req *destroy_session; 201 struct virtio_crypto *vcrypto = ctx->vcrypto; 202 int err; 203 unsigned int num_out = 0, num_in = 0; 204 struct virtio_crypto_op_ctrl_req *ctrl; 205 struct virtio_crypto_inhdr *ctrl_status; 206 struct virtio_crypto_ctrl_request *vc_ctrl_req; 207 208 vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL); 209 if (!vc_ctrl_req) 210 return -ENOMEM; 211 212 ctrl_status = &vc_ctrl_req->ctrl_status; 213 ctrl_status->status = VIRTIO_CRYPTO_ERR; 214 /* Pad ctrl header */ 215 ctrl = &vc_ctrl_req->ctrl; 216 ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION); 217 /* Set the default virtqueue id to 0 */ 218 ctrl->header.queue_id = 0; 219 220 destroy_session = &ctrl->u.destroy_session; 221 222 if (encrypt) 223 destroy_session->session_id = cpu_to_le64(ctx->enc_sess_info.session_id); 224 else 225 destroy_session->session_id = cpu_to_le64(ctx->dec_sess_info.session_id); 226 227 sg_init_one(&outhdr, ctrl, sizeof(*ctrl)); 228 sgs[num_out++] = &outhdr; 229 230 /* Return status and session id back */ 231 sg_init_one(&status_sg, &ctrl_status->status, sizeof(ctrl_status->status)); 232 sgs[num_out + num_in++] = &status_sg; 233 234 err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in, vc_ctrl_req); 235 if (err < 0) 236 goto out; 237 238 if (ctrl_status->status != VIRTIO_CRYPTO_OK) { 239 pr_err("virtio_crypto: Close session failed status: %u, session_id: 0x%llx\n", 240 ctrl_status->status, destroy_session->session_id); 241 242 err = -EINVAL; 243 goto out; 244 } 245 246 err = 0; 247 out: 248 kfree(vc_ctrl_req); 249 return err; 250 } 251 252 static int virtio_crypto_alg_skcipher_init_sessions( 253 struct virtio_crypto_skcipher_ctx *ctx, 254 const uint8_t *key, unsigned int keylen) 255 { 256 uint32_t alg; 257 int ret; 258 struct virtio_crypto *vcrypto = ctx->vcrypto; 259 260 if (keylen > vcrypto->max_cipher_key_len) { 261 pr_err("virtio_crypto: the key is too long\n"); 262 return -EINVAL; 263 } 264 265 if (virtio_crypto_alg_validate_key(keylen, &alg)) 266 return -EINVAL; 267 268 /* Create encryption session */ 269 ret = virtio_crypto_alg_skcipher_init_session(ctx, 270 alg, key, keylen, 1); 271 if (ret) 272 return ret; 273 /* Create decryption session */ 274 ret = virtio_crypto_alg_skcipher_init_session(ctx, 275 alg, key, keylen, 0); 276 if (ret) { 277 virtio_crypto_alg_skcipher_close_session(ctx, 1); 278 return ret; 279 } 280 return 0; 281 } 282 283 /* Note: kernel crypto API realization */ 284 static int virtio_crypto_skcipher_setkey(struct crypto_skcipher *tfm, 285 const uint8_t *key, 286 unsigned int keylen) 287 { 288 struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); 289 uint32_t alg; 290 int ret; 291 292 ret = virtio_crypto_alg_validate_key(keylen, &alg); 293 if (ret) 294 return ret; 295 296 if (!ctx->vcrypto) { 297 /* New key */ 298 int node = virtio_crypto_get_current_node(); 299 struct virtio_crypto *vcrypto = 300 virtcrypto_get_dev_node(node, 301 VIRTIO_CRYPTO_SERVICE_CIPHER, alg); 302 if (!vcrypto) { 303 pr_err("virtio_crypto: Could not find a virtio device in the system or unsupported algo\n"); 304 return -ENODEV; 305 } 306 307 ctx->vcrypto = vcrypto; 308 } else { 309 /* Rekeying, we should close the created sessions previously */ 310 virtio_crypto_alg_skcipher_close_session(ctx, 1); 311 virtio_crypto_alg_skcipher_close_session(ctx, 0); 312 } 313 314 ret = virtio_crypto_alg_skcipher_init_sessions(ctx, key, keylen); 315 if (ret) { 316 virtcrypto_dev_put(ctx->vcrypto); 317 ctx->vcrypto = NULL; 318 319 return ret; 320 } 321 322 return 0; 323 } 324 325 static int 326 __virtio_crypto_skcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req, 327 struct skcipher_request *req, 328 struct data_queue *data_vq) 329 { 330 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 331 struct virtio_crypto_skcipher_ctx *ctx = vc_sym_req->skcipher_ctx; 332 struct virtio_crypto_request *vc_req = &vc_sym_req->base; 333 unsigned int ivsize = crypto_skcipher_ivsize(tfm); 334 struct virtio_crypto *vcrypto = ctx->vcrypto; 335 struct virtio_crypto_op_data_req *req_data; 336 int src_nents, dst_nents; 337 int err; 338 unsigned long flags; 339 struct scatterlist outhdr, iv_sg, status_sg, **sgs; 340 u64 dst_len; 341 unsigned int num_out = 0, num_in = 0; 342 int sg_total; 343 uint8_t *iv; 344 struct scatterlist *sg; 345 346 src_nents = sg_nents_for_len(req->src, req->cryptlen); 347 if (src_nents < 0) { 348 pr_err("Invalid number of src SG.\n"); 349 return src_nents; 350 } 351 352 dst_nents = sg_nents(req->dst); 353 354 pr_debug("virtio_crypto: Number of sgs (src_nents: %d, dst_nents: %d)\n", 355 src_nents, dst_nents); 356 357 /* Why 3? outhdr + iv + inhdr */ 358 sg_total = src_nents + dst_nents + 3; 359 sgs = kcalloc_node(sg_total, sizeof(*sgs), GFP_KERNEL, 360 dev_to_node(&vcrypto->vdev->dev)); 361 if (!sgs) 362 return -ENOMEM; 363 364 req_data = kzalloc_node(sizeof(*req_data), GFP_KERNEL, 365 dev_to_node(&vcrypto->vdev->dev)); 366 if (!req_data) { 367 kfree(sgs); 368 return -ENOMEM; 369 } 370 371 vc_req->req_data = req_data; 372 vc_sym_req->type = VIRTIO_CRYPTO_SYM_OP_CIPHER; 373 /* Head of operation */ 374 if (vc_sym_req->encrypt) { 375 req_data->header.session_id = 376 cpu_to_le64(ctx->enc_sess_info.session_id); 377 req_data->header.opcode = 378 cpu_to_le32(VIRTIO_CRYPTO_CIPHER_ENCRYPT); 379 } else { 380 req_data->header.session_id = 381 cpu_to_le64(ctx->dec_sess_info.session_id); 382 req_data->header.opcode = 383 cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DECRYPT); 384 } 385 req_data->u.sym_req.op_type = cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER); 386 req_data->u.sym_req.u.cipher.para.iv_len = cpu_to_le32(ivsize); 387 req_data->u.sym_req.u.cipher.para.src_data_len = 388 cpu_to_le32(req->cryptlen); 389 390 dst_len = virtio_crypto_alg_sg_nents_length(req->dst); 391 if (unlikely(dst_len > U32_MAX)) { 392 pr_err("virtio_crypto: The dst_len is beyond U32_MAX\n"); 393 err = -EINVAL; 394 goto free; 395 } 396 397 dst_len = min_t(unsigned int, req->cryptlen, dst_len); 398 pr_debug("virtio_crypto: src_len: %u, dst_len: %llu\n", 399 req->cryptlen, dst_len); 400 401 if (unlikely(req->cryptlen + dst_len + ivsize + 402 sizeof(vc_req->status) > vcrypto->max_size)) { 403 pr_err("virtio_crypto: The length is too big\n"); 404 err = -EINVAL; 405 goto free; 406 } 407 408 req_data->u.sym_req.u.cipher.para.dst_data_len = 409 cpu_to_le32((uint32_t)dst_len); 410 411 /* Outhdr */ 412 sg_init_one(&outhdr, req_data, sizeof(*req_data)); 413 sgs[num_out++] = &outhdr; 414 415 /* IV */ 416 417 /* 418 * Avoid to do DMA from the stack, switch to using 419 * dynamically-allocated for the IV 420 */ 421 iv = kzalloc_node(ivsize, GFP_ATOMIC, 422 dev_to_node(&vcrypto->vdev->dev)); 423 if (!iv) { 424 err = -ENOMEM; 425 goto free; 426 } 427 memcpy(iv, req->iv, ivsize); 428 if (!vc_sym_req->encrypt) 429 scatterwalk_map_and_copy(req->iv, req->src, 430 req->cryptlen - AES_BLOCK_SIZE, 431 AES_BLOCK_SIZE, 0); 432 433 sg_init_one(&iv_sg, iv, ivsize); 434 sgs[num_out++] = &iv_sg; 435 vc_sym_req->iv = iv; 436 437 /* Source data */ 438 for (sg = req->src; src_nents; sg = sg_next(sg), src_nents--) 439 sgs[num_out++] = sg; 440 441 /* Destination data */ 442 for (sg = req->dst; sg; sg = sg_next(sg)) 443 sgs[num_out + num_in++] = sg; 444 445 /* Status */ 446 sg_init_one(&status_sg, &vc_req->status, sizeof(vc_req->status)); 447 sgs[num_out + num_in++] = &status_sg; 448 449 vc_req->sgs = sgs; 450 451 spin_lock_irqsave(&data_vq->lock, flags); 452 err = virtqueue_add_sgs(data_vq->vq, sgs, num_out, 453 num_in, vc_req, GFP_ATOMIC); 454 virtqueue_kick(data_vq->vq); 455 spin_unlock_irqrestore(&data_vq->lock, flags); 456 if (unlikely(err < 0)) 457 goto free_iv; 458 459 return 0; 460 461 free_iv: 462 kfree_sensitive(iv); 463 free: 464 kfree_sensitive(req_data); 465 kfree(sgs); 466 return err; 467 } 468 469 static int virtio_crypto_skcipher_encrypt(struct skcipher_request *req) 470 { 471 struct crypto_skcipher *atfm = crypto_skcipher_reqtfm(req); 472 struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(atfm); 473 struct virtio_crypto_sym_request *vc_sym_req = 474 skcipher_request_ctx(req); 475 struct virtio_crypto_request *vc_req = &vc_sym_req->base; 476 struct virtio_crypto *vcrypto = ctx->vcrypto; 477 /* Use the first data virtqueue as default */ 478 struct data_queue *data_vq = &vcrypto->data_vq[0]; 479 480 if (!req->cryptlen) 481 return 0; 482 if (req->cryptlen % AES_BLOCK_SIZE) 483 return -EINVAL; 484 485 vc_req->dataq = data_vq; 486 vc_req->alg_cb = virtio_crypto_dataq_sym_callback; 487 vc_sym_req->skcipher_ctx = ctx; 488 vc_sym_req->skcipher_req = req; 489 vc_sym_req->encrypt = true; 490 491 return crypto_transfer_skcipher_request_to_engine(data_vq->engine, req); 492 } 493 494 static int virtio_crypto_skcipher_decrypt(struct skcipher_request *req) 495 { 496 struct crypto_skcipher *atfm = crypto_skcipher_reqtfm(req); 497 struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(atfm); 498 struct virtio_crypto_sym_request *vc_sym_req = 499 skcipher_request_ctx(req); 500 struct virtio_crypto_request *vc_req = &vc_sym_req->base; 501 struct virtio_crypto *vcrypto = ctx->vcrypto; 502 /* Use the first data virtqueue as default */ 503 struct data_queue *data_vq = &vcrypto->data_vq[0]; 504 505 if (!req->cryptlen) 506 return 0; 507 if (req->cryptlen % AES_BLOCK_SIZE) 508 return -EINVAL; 509 510 vc_req->dataq = data_vq; 511 vc_req->alg_cb = virtio_crypto_dataq_sym_callback; 512 vc_sym_req->skcipher_ctx = ctx; 513 vc_sym_req->skcipher_req = req; 514 vc_sym_req->encrypt = false; 515 516 return crypto_transfer_skcipher_request_to_engine(data_vq->engine, req); 517 } 518 519 static int virtio_crypto_skcipher_init(struct crypto_skcipher *tfm) 520 { 521 struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); 522 523 crypto_skcipher_set_reqsize(tfm, sizeof(struct virtio_crypto_sym_request)); 524 ctx->tfm = tfm; 525 526 ctx->enginectx.op.do_one_request = virtio_crypto_skcipher_crypt_req; 527 ctx->enginectx.op.prepare_request = NULL; 528 ctx->enginectx.op.unprepare_request = NULL; 529 return 0; 530 } 531 532 static void virtio_crypto_skcipher_exit(struct crypto_skcipher *tfm) 533 { 534 struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); 535 536 if (!ctx->vcrypto) 537 return; 538 539 virtio_crypto_alg_skcipher_close_session(ctx, 1); 540 virtio_crypto_alg_skcipher_close_session(ctx, 0); 541 virtcrypto_dev_put(ctx->vcrypto); 542 ctx->vcrypto = NULL; 543 } 544 545 int virtio_crypto_skcipher_crypt_req( 546 struct crypto_engine *engine, void *vreq) 547 { 548 struct skcipher_request *req = container_of(vreq, struct skcipher_request, base); 549 struct virtio_crypto_sym_request *vc_sym_req = 550 skcipher_request_ctx(req); 551 struct virtio_crypto_request *vc_req = &vc_sym_req->base; 552 struct data_queue *data_vq = vc_req->dataq; 553 int ret; 554 555 ret = __virtio_crypto_skcipher_do_req(vc_sym_req, req, data_vq); 556 if (ret < 0) 557 return ret; 558 559 virtqueue_kick(data_vq->vq); 560 561 return 0; 562 } 563 564 static void virtio_crypto_skcipher_finalize_req( 565 struct virtio_crypto_sym_request *vc_sym_req, 566 struct skcipher_request *req, 567 int err) 568 { 569 if (vc_sym_req->encrypt) 570 scatterwalk_map_and_copy(req->iv, req->dst, 571 req->cryptlen - AES_BLOCK_SIZE, 572 AES_BLOCK_SIZE, 0); 573 kfree_sensitive(vc_sym_req->iv); 574 virtcrypto_clear_request(&vc_sym_req->base); 575 576 crypto_finalize_skcipher_request(vc_sym_req->base.dataq->engine, 577 req, err); 578 } 579 580 static struct virtio_crypto_algo virtio_crypto_algs[] = { { 581 .algonum = VIRTIO_CRYPTO_CIPHER_AES_CBC, 582 .service = VIRTIO_CRYPTO_SERVICE_CIPHER, 583 .algo = { 584 .base.cra_name = "cbc(aes)", 585 .base.cra_driver_name = "virtio_crypto_aes_cbc", 586 .base.cra_priority = 150, 587 .base.cra_flags = CRYPTO_ALG_ASYNC | 588 CRYPTO_ALG_ALLOCATES_MEMORY, 589 .base.cra_blocksize = AES_BLOCK_SIZE, 590 .base.cra_ctxsize = sizeof(struct virtio_crypto_skcipher_ctx), 591 .base.cra_module = THIS_MODULE, 592 .init = virtio_crypto_skcipher_init, 593 .exit = virtio_crypto_skcipher_exit, 594 .setkey = virtio_crypto_skcipher_setkey, 595 .decrypt = virtio_crypto_skcipher_decrypt, 596 .encrypt = virtio_crypto_skcipher_encrypt, 597 .min_keysize = AES_MIN_KEY_SIZE, 598 .max_keysize = AES_MAX_KEY_SIZE, 599 .ivsize = AES_BLOCK_SIZE, 600 }, 601 } }; 602 603 int virtio_crypto_skcipher_algs_register(struct virtio_crypto *vcrypto) 604 { 605 int ret = 0; 606 int i = 0; 607 608 mutex_lock(&algs_lock); 609 610 for (i = 0; i < ARRAY_SIZE(virtio_crypto_algs); i++) { 611 612 uint32_t service = virtio_crypto_algs[i].service; 613 uint32_t algonum = virtio_crypto_algs[i].algonum; 614 615 if (!virtcrypto_algo_is_supported(vcrypto, service, algonum)) 616 continue; 617 618 if (virtio_crypto_algs[i].active_devs == 0) { 619 ret = crypto_register_skcipher(&virtio_crypto_algs[i].algo); 620 if (ret) 621 goto unlock; 622 } 623 624 virtio_crypto_algs[i].active_devs++; 625 dev_info(&vcrypto->vdev->dev, "Registered algo %s\n", 626 virtio_crypto_algs[i].algo.base.cra_name); 627 } 628 629 unlock: 630 mutex_unlock(&algs_lock); 631 return ret; 632 } 633 634 void virtio_crypto_skcipher_algs_unregister(struct virtio_crypto *vcrypto) 635 { 636 int i = 0; 637 638 mutex_lock(&algs_lock); 639 640 for (i = 0; i < ARRAY_SIZE(virtio_crypto_algs); i++) { 641 642 uint32_t service = virtio_crypto_algs[i].service; 643 uint32_t algonum = virtio_crypto_algs[i].algonum; 644 645 if (virtio_crypto_algs[i].active_devs == 0 || 646 !virtcrypto_algo_is_supported(vcrypto, service, algonum)) 647 continue; 648 649 if (virtio_crypto_algs[i].active_devs == 1) 650 crypto_unregister_skcipher(&virtio_crypto_algs[i].algo); 651 652 virtio_crypto_algs[i].active_devs--; 653 } 654 655 mutex_unlock(&algs_lock); 656 } 657