crypto/cryptd.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Software async crypto daemon.
   4  *
   5  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
   6  *
   7  * Added AEAD support to cryptd.
   8  *    Authors: Tadeusz Struk (tadeusz.struk@intel.com)
   9  *             Adrian Hoban <adrian.hoban@intel.com>
  10  *             Gabriele Paoloni <gabriele.paoloni@intel.com>
  11  *             Aidan O'Mahony (aidan.o.mahony@intel.com)
  12  *    Copyright (c) 2010, Intel Corporation.
  13  */
  14
  15 #include <crypto/internal/hash.h>
  16 #include <crypto/internal/aead.h>
  17 #include <crypto/internal/skcipher.h>
  18 #include <crypto/cryptd.h>
  19 #include <linux/refcount.h>
  20 #include <linux/err.h>
  21 #include <linux/init.h>
  22 #include <linux/kernel.h>
  23 #include <linux/list.h>
  24 #include <linux/module.h>
  25 #include <linux/scatterlist.h>
  26 #include <linux/sched.h>
  27 #include <linux/slab.h>
  28 #include <linux/workqueue.h>
  29
  30 static unsigned int cryptd_max_cpu_qlen = 1000;
  31 module_param(cryptd_max_cpu_qlen, uint, 0);
  32 MODULE_PARM_DESC(cryptd_max_cpu_qlen, "Set cryptd Max queue depth");
  33
  34 static struct workqueue_struct *cryptd_wq;
  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 skcipherd_instance_ctx {
  51         struct crypto_skcipher_spawn spawn;
  52         struct cryptd_queue *queue;
  53 };
  54
  55 struct hashd_instance_ctx {
  56         struct crypto_shash_spawn spawn;
  57         struct cryptd_queue *queue;
  58 };
  59
  60 struct aead_instance_ctx {
  61         struct crypto_aead_spawn aead_spawn;
  62         struct cryptd_queue *queue;
  63 };
  64
  65 struct cryptd_skcipher_ctx {
  66         refcount_t refcnt;
  67         struct crypto_sync_skcipher *child;
  68 };
  69
  70 struct cryptd_skcipher_request_ctx {
  71         crypto_completion_t complete;
  72 };
  73
  74 struct cryptd_hash_ctx {
  75         refcount_t refcnt;
  76         struct crypto_shash *child;
  77 };
  78
  79 struct cryptd_hash_request_ctx {
  80         crypto_completion_t complete;
  81         struct shash_desc desc;
  82 };
  83
  84 struct cryptd_aead_ctx {
  85         refcount_t refcnt;
  86         struct crypto_aead *child;
  87 };
  88
  89 struct cryptd_aead_request_ctx {
  90         crypto_completion_t complete;
  91 };
  92
  93 static void cryptd_queue_worker(struct work_struct *work);
  94
  95 static int cryptd_init_queue(struct cryptd_queue *queue,
  96                              unsigned int max_cpu_qlen)
  97 {
  98         int cpu;
  99         struct cryptd_cpu_queue *cpu_queue;
 100
 101         queue->cpu_queue = alloc_percpu(struct cryptd_cpu_queue);
 102         if (!queue->cpu_queue)
 103                 return -ENOMEM;
 104         for_each_possible_cpu(cpu) {
 105                 cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
 106                 crypto_init_queue(&cpu_queue->queue, max_cpu_qlen);
 107                 INIT_WORK(&cpu_queue->work, cryptd_queue_worker);
 108         }
 109         pr_info("cryptd: max_cpu_qlen set to %d\n", max_cpu_qlen);
 110         return 0;
 111 }
 112
 113 static void cryptd_fini_queue(struct cryptd_queue *queue)
 114 {
 115         int cpu;
 116         struct cryptd_cpu_queue *cpu_queue;
 117
 118         for_each_possible_cpu(cpu) {
 119                 cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
 120                 BUG_ON(cpu_queue->queue.qlen);
 121         }
 122         free_percpu(queue->cpu_queue);
 123 }
 124
 125 static int cryptd_enqueue_request(struct cryptd_queue *queue,
 126                                   struct crypto_async_request *request)
 127 {
 128         int cpu, err;
 129         struct cryptd_cpu_queue *cpu_queue;
 130         refcount_t *refcnt;
 131
 132         cpu = get_cpu();
 133         cpu_queue = this_cpu_ptr(queue->cpu_queue);
 134         err = crypto_enqueue_request(&cpu_queue->queue, request);
 135
 136         refcnt = crypto_tfm_ctx(request->tfm);
 137
 138         if (err == -ENOSPC)
 139                 goto out_put_cpu;
 140
 141         queue_work_on(cpu, cryptd_wq, &cpu_queue->work);
 142
 143         if (!refcount_read(refcnt))
 144                 goto out_put_cpu;
 145
 146         refcount_inc(refcnt);
 147
 148 out_put_cpu:
 149         put_cpu();
 150
 151         return err;
 152 }
 153
 154 /* Called in workqueue context, do one real cryption work (via
 155  * req->complete) and reschedule itself if there are more work to
 156  * do. */
 157 static void cryptd_queue_worker(struct work_struct *work)
 158 {
 159         struct cryptd_cpu_queue *cpu_queue;
 160         struct crypto_async_request *req, *backlog;
 161
 162         cpu_queue = container_of(work, struct cryptd_cpu_queue, work);
 163         /*
 164          * Only handle one request at a time to avoid hogging crypto workqueue.
 165          * preempt_disable/enable is used to prevent being preempted by
 166          * cryptd_enqueue_request(). local_bh_disable/enable is used to prevent
 167          * cryptd_enqueue_request() being accessed from software interrupts.
 168          */
 169         local_bh_disable();
 170         preempt_disable();
 171         backlog = crypto_get_backlog(&cpu_queue->queue);
 172         req = crypto_dequeue_request(&cpu_queue->queue);
 173         preempt_enable();
 174         local_bh_enable();
 175
 176         if (!req)
 177                 return;
 178
 179         if (backlog)
 180                 backlog->complete(backlog, -EINPROGRESS);
 181         req->complete(req, 0);
 182
 183         if (cpu_queue->queue.qlen)
 184                 queue_work(cryptd_wq, &cpu_queue->work);
 185 }
 186
 187 static inline struct cryptd_queue *cryptd_get_queue(struct crypto_tfm *tfm)
 188 {
 189         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 190         struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
 191         return ictx->queue;
 192 }
 193
 194 static inline void cryptd_check_internal(struct rtattr **tb, u32 *type,
 195                                          u32 *mask)
 196 {
 197         struct crypto_attr_type *algt;
 198
 199         algt = crypto_get_attr_type(tb);
 200         if (IS_ERR(algt))
 201                 return;
 202
 203         *type |= algt->type & CRYPTO_ALG_INTERNAL;
 204         *mask |= algt->mask & CRYPTO_ALG_INTERNAL;
 205 }
 206
 207 static int cryptd_init_instance(struct crypto_instance *inst,
 208                                 struct crypto_alg *alg)
 209 {
 210         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 211                      "cryptd(%s)",
 212                      alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 213                 return -ENAMETOOLONG;
 214
 215         memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
 216
 217         inst->alg.cra_priority = alg->cra_priority + 50;
 218         inst->alg.cra_blocksize = alg->cra_blocksize;
 219         inst->alg.cra_alignmask = alg->cra_alignmask;
 220
 221         return 0;
 222 }
 223
 224 static int cryptd_skcipher_setkey(struct crypto_skcipher *parent,
 225                                   const u8 *key, unsigned int keylen)
 226 {
 227         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(parent);
 228         struct crypto_sync_skcipher *child = ctx->child;
 229
 230         crypto_sync_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 231         crypto_sync_skcipher_set_flags(child,
 232                                        crypto_skcipher_get_flags(parent) &
 233                                          CRYPTO_TFM_REQ_MASK);
 234         return crypto_sync_skcipher_setkey(child, key, keylen);
 235 }
 236
 237 static void cryptd_skcipher_complete(struct skcipher_request *req, int err)
 238 {
 239         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 240         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 241         struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req);
 242         int refcnt = refcount_read(&ctx->refcnt);
 243
 244         local_bh_disable();
 245         rctx->complete(&req->base, err);
 246         local_bh_enable();
 247
 248         if (err != -EINPROGRESS && refcnt && refcount_dec_and_test(&ctx->refcnt))
 249                 crypto_free_skcipher(tfm);
 250 }
 251
 252 static void cryptd_skcipher_encrypt(struct crypto_async_request *base,
 253                                     int err)
 254 {
 255         struct skcipher_request *req = skcipher_request_cast(base);
 256         struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req);
 257         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 258         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 259         struct crypto_sync_skcipher *child = ctx->child;
 260         SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, child);
 261
 262         if (unlikely(err == -EINPROGRESS))
 263                 goto out;
 264
 265         skcipher_request_set_sync_tfm(subreq, child);
 266         skcipher_request_set_callback(subreq, CRYPTO_TFM_REQ_MAY_SLEEP,
 267                                       NULL, NULL);
 268         skcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
 269                                    req->iv);
 270
 271         err = crypto_skcipher_encrypt(subreq);
 272         skcipher_request_zero(subreq);
 273
 274         req->base.complete = rctx->complete;
 275
 276 out:
 277         cryptd_skcipher_complete(req, err);
 278 }
 279
 280 static void cryptd_skcipher_decrypt(struct crypto_async_request *base,
 281                                     int err)
 282 {
 283         struct skcipher_request *req = skcipher_request_cast(base);
 284         struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req);
 285         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 286         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 287         struct crypto_sync_skcipher *child = ctx->child;
 288         SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, child);
 289
 290         if (unlikely(err == -EINPROGRESS))
 291                 goto out;
 292
 293         skcipher_request_set_sync_tfm(subreq, child);
 294         skcipher_request_set_callback(subreq, CRYPTO_TFM_REQ_MAY_SLEEP,
 295                                       NULL, NULL);
 296         skcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
 297                                    req->iv);
 298
 299         err = crypto_skcipher_decrypt(subreq);
 300         skcipher_request_zero(subreq);
 301
 302         req->base.complete = rctx->complete;
 303
 304 out:
 305         cryptd_skcipher_complete(req, err);
 306 }
 307
 308 static int cryptd_skcipher_enqueue(struct skcipher_request *req,
 309                                    crypto_completion_t compl)
 310 {
 311         struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req);
 312         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 313         struct cryptd_queue *queue;
 314
 315         queue = cryptd_get_queue(crypto_skcipher_tfm(tfm));
 316         rctx->complete = req->base.complete;
 317         req->base.complete = compl;
 318
 319         return cryptd_enqueue_request(queue, &req->base);
 320 }
 321
 322 static int cryptd_skcipher_encrypt_enqueue(struct skcipher_request *req)
 323 {
 324         return cryptd_skcipher_enqueue(req, cryptd_skcipher_encrypt);
 325 }
 326
 327 static int cryptd_skcipher_decrypt_enqueue(struct skcipher_request *req)
 328 {
 329         return cryptd_skcipher_enqueue(req, cryptd_skcipher_decrypt);
 330 }
 331
 332 static int cryptd_skcipher_init_tfm(struct crypto_skcipher *tfm)
 333 {
 334         struct skcipher_instance *inst = skcipher_alg_instance(tfm);
 335         struct skcipherd_instance_ctx *ictx = skcipher_instance_ctx(inst);
 336         struct crypto_skcipher_spawn *spawn = &ictx->spawn;
 337         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 338         struct crypto_skcipher *cipher;
 339
 340         cipher = crypto_spawn_skcipher(spawn);
 341         if (IS_ERR(cipher))
 342                 return PTR_ERR(cipher);
 343
 344         ctx->child = (struct crypto_sync_skcipher *)cipher;
 345         crypto_skcipher_set_reqsize(
 346                 tfm, sizeof(struct cryptd_skcipher_request_ctx));
 347         return 0;
 348 }
 349
 350 static void cryptd_skcipher_exit_tfm(struct crypto_skcipher *tfm)
 351 {
 352         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 353
 354         crypto_free_sync_skcipher(ctx->child);
 355 }
 356
 357 static void cryptd_skcipher_free(struct skcipher_instance *inst)
 358 {
 359         struct skcipherd_instance_ctx *ctx = skcipher_instance_ctx(inst);
 360
 361         crypto_drop_skcipher(&ctx->spawn);
 362         kfree(inst);
 363 }
 364
 365 static int cryptd_create_skcipher(struct crypto_template *tmpl,
 366                                   struct rtattr **tb,
 367                                   struct cryptd_queue *queue)
 368 {
 369         struct skcipherd_instance_ctx *ctx;
 370         struct skcipher_instance *inst;
 371         struct skcipher_alg *alg;
 372         u32 type;
 373         u32 mask;
 374         int err;
 375
 376         type = 0;
 377         mask = CRYPTO_ALG_ASYNC;
 378
 379         cryptd_check_internal(tb, &type, &mask);
 380
 381         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 382         if (!inst)
 383                 return -ENOMEM;
 384
 385         ctx = skcipher_instance_ctx(inst);
 386         ctx->queue = queue;
 387
 388         err = crypto_grab_skcipher(&ctx->spawn, skcipher_crypto_instance(inst),
 389                                    crypto_attr_alg_name(tb[1]), type, mask);
 390         if (err)
 391                 goto err_free_inst;
 392
 393         alg = crypto_spawn_skcipher_alg(&ctx->spawn);
 394         err = cryptd_init_instance(skcipher_crypto_instance(inst), &alg->base);
 395         if (err)
 396                 goto err_free_inst;
 397
 398         inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC |
 399                                    (alg->base.cra_flags & CRYPTO_ALG_INTERNAL);
 400
 401         inst->alg.ivsize = crypto_skcipher_alg_ivsize(alg);
 402         inst->alg.chunksize = crypto_skcipher_alg_chunksize(alg);
 403         inst->alg.min_keysize = crypto_skcipher_alg_min_keysize(alg);
 404         inst->alg.max_keysize = crypto_skcipher_alg_max_keysize(alg);
 405
 406         inst->alg.base.cra_ctxsize = sizeof(struct cryptd_skcipher_ctx);
 407
 408         inst->alg.init = cryptd_skcipher_init_tfm;
 409         inst->alg.exit = cryptd_skcipher_exit_tfm;
 410
 411         inst->alg.setkey = cryptd_skcipher_setkey;
 412         inst->alg.encrypt = cryptd_skcipher_encrypt_enqueue;
 413         inst->alg.decrypt = cryptd_skcipher_decrypt_enqueue;
 414
 415         inst->free = cryptd_skcipher_free;
 416
 417         err = skcipher_register_instance(tmpl, inst);
 418         if (err) {
 419 err_free_inst:
 420                 cryptd_skcipher_free(inst);
 421         }
 422         return err;
 423 }
 424
 425 static int cryptd_hash_init_tfm(struct crypto_tfm *tfm)
 426 {
 427         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 428         struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst);
 429         struct crypto_shash_spawn *spawn = &ictx->spawn;
 430         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 431         struct crypto_shash *hash;
 432
 433         hash = crypto_spawn_shash(spawn);
 434         if (IS_ERR(hash))
 435                 return PTR_ERR(hash);
 436
 437         ctx->child = hash;
 438         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 439                                  sizeof(struct cryptd_hash_request_ctx) +
 440                                  crypto_shash_descsize(hash));
 441         return 0;
 442 }
 443
 444 static void cryptd_hash_exit_tfm(struct crypto_tfm *tfm)
 445 {
 446         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 447
 448         crypto_free_shash(ctx->child);
 449 }
 450
 451 static int cryptd_hash_setkey(struct crypto_ahash *parent,
 452                                    const u8 *key, unsigned int keylen)
 453 {
 454         struct cryptd_hash_ctx *ctx   = crypto_ahash_ctx(parent);
 455         struct crypto_shash *child = ctx->child;
 456
 457         crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 458         crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) &
 459                                       CRYPTO_TFM_REQ_MASK);
 460         return crypto_shash_setkey(child, key, keylen);
 461 }
 462
 463 static int cryptd_hash_enqueue(struct ahash_request *req,
 464                                 crypto_completion_t compl)
 465 {
 466         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 467         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 468         struct cryptd_queue *queue =
 469                 cryptd_get_queue(crypto_ahash_tfm(tfm));
 470
 471         rctx->complete = req->base.complete;
 472         req->base.complete = compl;
 473
 474         return cryptd_enqueue_request(queue, &req->base);
 475 }
 476
 477 static void cryptd_hash_complete(struct ahash_request *req, int err)
 478 {
 479         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 480         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 481         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 482         int refcnt = refcount_read(&ctx->refcnt);
 483
 484         local_bh_disable();
 485         rctx->complete(&req->base, err);
 486         local_bh_enable();
 487
 488         if (err != -EINPROGRESS && refcnt && refcount_dec_and_test(&ctx->refcnt))
 489                 crypto_free_ahash(tfm);
 490 }
 491
 492 static void cryptd_hash_init(struct crypto_async_request *req_async, int err)
 493 {
 494         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 495         struct crypto_shash *child = ctx->child;
 496         struct ahash_request *req = ahash_request_cast(req_async);
 497         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 498         struct shash_desc *desc = &rctx->desc;
 499
 500         if (unlikely(err == -EINPROGRESS))
 501                 goto out;
 502
 503         desc->tfm = child;
 504
 505         err = crypto_shash_init(desc);
 506
 507         req->base.complete = rctx->complete;
 508
 509 out:
 510         cryptd_hash_complete(req, err);
 511 }
 512
 513 static int cryptd_hash_init_enqueue(struct ahash_request *req)
 514 {
 515         return cryptd_hash_enqueue(req, cryptd_hash_init);
 516 }
 517
 518 static void cryptd_hash_update(struct crypto_async_request *req_async, int err)
 519 {
 520         struct ahash_request *req = ahash_request_cast(req_async);
 521         struct cryptd_hash_request_ctx *rctx;
 522
 523         rctx = ahash_request_ctx(req);
 524
 525         if (unlikely(err == -EINPROGRESS))
 526                 goto out;
 527
 528         err = shash_ahash_update(req, &rctx->desc);
 529
 530         req->base.complete = rctx->complete;
 531
 532 out:
 533         cryptd_hash_complete(req, err);
 534 }
 535
 536 static int cryptd_hash_update_enqueue(struct ahash_request *req)
 537 {
 538         return cryptd_hash_enqueue(req, cryptd_hash_update);
 539 }
 540
 541 static void cryptd_hash_final(struct crypto_async_request *req_async, int err)
 542 {
 543         struct ahash_request *req = ahash_request_cast(req_async);
 544         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 545
 546         if (unlikely(err == -EINPROGRESS))
 547                 goto out;
 548
 549         err = crypto_shash_final(&rctx->desc, req->result);
 550
 551         req->base.complete = rctx->complete;
 552
 553 out:
 554         cryptd_hash_complete(req, err);
 555 }
 556
 557 static int cryptd_hash_final_enqueue(struct ahash_request *req)
 558 {
 559         return cryptd_hash_enqueue(req, cryptd_hash_final);
 560 }
 561
 562 static void cryptd_hash_finup(struct crypto_async_request *req_async, int err)
 563 {
 564         struct ahash_request *req = ahash_request_cast(req_async);
 565         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 566
 567         if (unlikely(err == -EINPROGRESS))
 568                 goto out;
 569
 570         err = shash_ahash_finup(req, &rctx->desc);
 571
 572         req->base.complete = rctx->complete;
 573
 574 out:
 575         cryptd_hash_complete(req, err);
 576 }
 577
 578 static int cryptd_hash_finup_enqueue(struct ahash_request *req)
 579 {
 580         return cryptd_hash_enqueue(req, cryptd_hash_finup);
 581 }
 582
 583 static void cryptd_hash_digest(struct crypto_async_request *req_async, int err)
 584 {
 585         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 586         struct crypto_shash *child = ctx->child;
 587         struct ahash_request *req = ahash_request_cast(req_async);
 588         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 589         struct shash_desc *desc = &rctx->desc;
 590
 591         if (unlikely(err == -EINPROGRESS))
 592                 goto out;
 593
 594         desc->tfm = child;
 595
 596         err = shash_ahash_digest(req, desc);
 597
 598         req->base.complete = rctx->complete;
 599
 600 out:
 601         cryptd_hash_complete(req, err);
 602 }
 603
 604 static int cryptd_hash_digest_enqueue(struct ahash_request *req)
 605 {
 606         return cryptd_hash_enqueue(req, cryptd_hash_digest);
 607 }
 608
 609 static int cryptd_hash_export(struct ahash_request *req, void *out)
 610 {
 611         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 612
 613         return crypto_shash_export(&rctx->desc, out);
 614 }
 615
 616 static int cryptd_hash_import(struct ahash_request *req, const void *in)
 617 {
 618         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 619         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 620         struct shash_desc *desc = cryptd_shash_desc(req);
 621
 622         desc->tfm = ctx->child;
 623
 624         return crypto_shash_import(desc, in);
 625 }
 626
 627 static void cryptd_hash_free(struct ahash_instance *inst)
 628 {
 629         struct hashd_instance_ctx *ctx = ahash_instance_ctx(inst);
 630
 631         crypto_drop_shash(&ctx->spawn);
 632         kfree(inst);
 633 }
 634
 635 static int cryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
 636                               struct cryptd_queue *queue)
 637 {
 638         struct hashd_instance_ctx *ctx;
 639         struct ahash_instance *inst;
 640         struct shash_alg *alg;
 641         u32 type = 0;
 642         u32 mask = 0;
 643         int err;
 644
 645         cryptd_check_internal(tb, &type, &mask);
 646
 647         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 648         if (!inst)
 649                 return -ENOMEM;
 650
 651         ctx = ahash_instance_ctx(inst);
 652         ctx->queue = queue;
 653
 654         err = crypto_grab_shash(&ctx->spawn, ahash_crypto_instance(inst),
 655                                 crypto_attr_alg_name(tb[1]), type, mask);
 656         if (err)
 657                 goto err_free_inst;
 658         alg = crypto_spawn_shash_alg(&ctx->spawn);
 659
 660         err = cryptd_init_instance(ahash_crypto_instance(inst), &alg->base);
 661         if (err)
 662                 goto err_free_inst;
 663
 664         inst->alg.halg.base.cra_flags = CRYPTO_ALG_ASYNC |
 665                 (alg->base.cra_flags & (CRYPTO_ALG_INTERNAL |
 666                                         CRYPTO_ALG_OPTIONAL_KEY));
 667
 668         inst->alg.halg.digestsize = alg->digestsize;
 669         inst->alg.halg.statesize = alg->statesize;
 670         inst->alg.halg.base.cra_ctxsize = sizeof(struct cryptd_hash_ctx);
 671
 672         inst->alg.halg.base.cra_init = cryptd_hash_init_tfm;
 673         inst->alg.halg.base.cra_exit = cryptd_hash_exit_tfm;
 674
 675         inst->alg.init   = cryptd_hash_init_enqueue;
 676         inst->alg.update = cryptd_hash_update_enqueue;
 677         inst->alg.final  = cryptd_hash_final_enqueue;
 678         inst->alg.finup  = cryptd_hash_finup_enqueue;
 679         inst->alg.export = cryptd_hash_export;
 680         inst->alg.import = cryptd_hash_import;
 681         if (crypto_shash_alg_has_setkey(alg))
 682                 inst->alg.setkey = cryptd_hash_setkey;
 683         inst->alg.digest = cryptd_hash_digest_enqueue;
 684
 685         inst->free = cryptd_hash_free;
 686
 687         err = ahash_register_instance(tmpl, inst);
 688         if (err) {
 689 err_free_inst:
 690                 cryptd_hash_free(inst);
 691         }
 692         return err;
 693 }
 694
 695 static int cryptd_aead_setkey(struct crypto_aead *parent,
 696                               const u8 *key, unsigned int keylen)
 697 {
 698         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(parent);
 699         struct crypto_aead *child = ctx->child;
 700
 701         return crypto_aead_setkey(child, key, keylen);
 702 }
 703
 704 static int cryptd_aead_setauthsize(struct crypto_aead *parent,
 705                                    unsigned int authsize)
 706 {
 707         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(parent);
 708         struct crypto_aead *child = ctx->child;
 709
 710         return crypto_aead_setauthsize(child, authsize);
 711 }
 712
 713 static void cryptd_aead_crypt(struct aead_request *req,
 714                         struct crypto_aead *child,
 715                         int err,
 716                         int (*crypt)(struct aead_request *req))
 717 {
 718         struct cryptd_aead_request_ctx *rctx;
 719         struct cryptd_aead_ctx *ctx;
 720         crypto_completion_t compl;
 721         struct crypto_aead *tfm;
 722         int refcnt;
 723
 724         rctx = aead_request_ctx(req);
 725         compl = rctx->complete;
 726
 727         tfm = crypto_aead_reqtfm(req);
 728
 729         if (unlikely(err == -EINPROGRESS))
 730                 goto out;
 731         aead_request_set_tfm(req, child);
 732         err = crypt( req );
 733
 734 out:
 735         ctx = crypto_aead_ctx(tfm);
 736         refcnt = refcount_read(&ctx->refcnt);
 737
 738         local_bh_disable();
 739         compl(&req->base, err);
 740         local_bh_enable();
 741
 742         if (err != -EINPROGRESS && refcnt && refcount_dec_and_test(&ctx->refcnt))
 743                 crypto_free_aead(tfm);
 744 }
 745
 746 static void cryptd_aead_encrypt(struct crypto_async_request *areq, int err)
 747 {
 748         struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
 749         struct crypto_aead *child = ctx->child;
 750         struct aead_request *req;
 751
 752         req = container_of(areq, struct aead_request, base);
 753         cryptd_aead_crypt(req, child, err, crypto_aead_alg(child)->encrypt);
 754 }
 755
 756 static void cryptd_aead_decrypt(struct crypto_async_request *areq, int err)
 757 {
 758         struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
 759         struct crypto_aead *child = ctx->child;
 760         struct aead_request *req;
 761
 762         req = container_of(areq, struct aead_request, base);
 763         cryptd_aead_crypt(req, child, err, crypto_aead_alg(child)->decrypt);
 764 }
 765
 766 static int cryptd_aead_enqueue(struct aead_request *req,
 767                                     crypto_completion_t compl)
 768 {
 769         struct cryptd_aead_request_ctx *rctx = aead_request_ctx(req);
 770         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 771         struct cryptd_queue *queue = cryptd_get_queue(crypto_aead_tfm(tfm));
 772
 773         rctx->complete = req->base.complete;
 774         req->base.complete = compl;
 775         return cryptd_enqueue_request(queue, &req->base);
 776 }
 777
 778 static int cryptd_aead_encrypt_enqueue(struct aead_request *req)
 779 {
 780         return cryptd_aead_enqueue(req, cryptd_aead_encrypt );
 781 }
 782
 783 static int cryptd_aead_decrypt_enqueue(struct aead_request *req)
 784 {
 785         return cryptd_aead_enqueue(req, cryptd_aead_decrypt );
 786 }
 787
 788 static int cryptd_aead_init_tfm(struct crypto_aead *tfm)
 789 {
 790         struct aead_instance *inst = aead_alg_instance(tfm);
 791         struct aead_instance_ctx *ictx = aead_instance_ctx(inst);
 792         struct crypto_aead_spawn *spawn = &ictx->aead_spawn;
 793         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(tfm);
 794         struct crypto_aead *cipher;
 795
 796         cipher = crypto_spawn_aead(spawn);
 797         if (IS_ERR(cipher))
 798                 return PTR_ERR(cipher);
 799
 800         ctx->child = cipher;
 801         crypto_aead_set_reqsize(
 802                 tfm, max((unsigned)sizeof(struct cryptd_aead_request_ctx),
 803                          crypto_aead_reqsize(cipher)));
 804         return 0;
 805 }
 806
 807 static void cryptd_aead_exit_tfm(struct crypto_aead *tfm)
 808 {
 809         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(tfm);
 810         crypto_free_aead(ctx->child);
 811 }
 812
 813 static void cryptd_aead_free(struct aead_instance *inst)
 814 {
 815         struct aead_instance_ctx *ctx = aead_instance_ctx(inst);
 816
 817         crypto_drop_aead(&ctx->aead_spawn);
 818         kfree(inst);
 819 }
 820
 821 static int cryptd_create_aead(struct crypto_template *tmpl,
 822                               struct rtattr **tb,
 823                               struct cryptd_queue *queue)
 824 {
 825         struct aead_instance_ctx *ctx;
 826         struct aead_instance *inst;
 827         struct aead_alg *alg;
 828         u32 type = 0;
 829         u32 mask = CRYPTO_ALG_ASYNC;
 830         int err;
 831
 832         cryptd_check_internal(tb, &type, &mask);
 833
 834         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 835         if (!inst)
 836                 return -ENOMEM;
 837
 838         ctx = aead_instance_ctx(inst);
 839         ctx->queue = queue;
 840
 841         err = crypto_grab_aead(&ctx->aead_spawn, aead_crypto_instance(inst),
 842                                crypto_attr_alg_name(tb[1]), type, mask);
 843         if (err)
 844                 goto err_free_inst;
 845
 846         alg = crypto_spawn_aead_alg(&ctx->aead_spawn);
 847         err = cryptd_init_instance(aead_crypto_instance(inst), &alg->base);
 848         if (err)
 849                 goto err_free_inst;
 850
 851         inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC |
 852                                    (alg->base.cra_flags & CRYPTO_ALG_INTERNAL);
 853         inst->alg.base.cra_ctxsize = sizeof(struct cryptd_aead_ctx);
 854
 855         inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
 856         inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
 857
 858         inst->alg.init = cryptd_aead_init_tfm;
 859         inst->alg.exit = cryptd_aead_exit_tfm;
 860         inst->alg.setkey = cryptd_aead_setkey;
 861         inst->alg.setauthsize = cryptd_aead_setauthsize;
 862         inst->alg.encrypt = cryptd_aead_encrypt_enqueue;
 863         inst->alg.decrypt = cryptd_aead_decrypt_enqueue;
 864
 865         inst->free = cryptd_aead_free;
 866
 867         err = aead_register_instance(tmpl, inst);
 868         if (err) {
 869 err_free_inst:
 870                 cryptd_aead_free(inst);
 871         }
 872         return err;
 873 }
 874
 875 static struct cryptd_queue queue;
 876
 877 static int cryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
 878 {
 879         struct crypto_attr_type *algt;
 880
 881         algt = crypto_get_attr_type(tb);
 882         if (IS_ERR(algt))
 883                 return PTR_ERR(algt);
 884
 885         switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
 886         case CRYPTO_ALG_TYPE_SKCIPHER:
 887                 return cryptd_create_skcipher(tmpl, tb, &queue);
 888         case CRYPTO_ALG_TYPE_HASH:
 889                 return cryptd_create_hash(tmpl, tb, &queue);
 890         case CRYPTO_ALG_TYPE_AEAD:
 891                 return cryptd_create_aead(tmpl, tb, &queue);
 892         }
 893
 894         return -EINVAL;
 895 }
 896
 897 static struct crypto_template cryptd_tmpl = {
 898         .name = "cryptd",
 899         .create = cryptd_create,
 900         .module = THIS_MODULE,
 901 };
 902
 903 struct cryptd_skcipher *cryptd_alloc_skcipher(const char *alg_name,
 904                                               u32 type, u32 mask)
 905 {
 906         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 907         struct cryptd_skcipher_ctx *ctx;
 908         struct crypto_skcipher *tfm;
 909
 910         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 911                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 912                 return ERR_PTR(-EINVAL);
 913
 914         tfm = crypto_alloc_skcipher(cryptd_alg_name, type, mask);
 915         if (IS_ERR(tfm))
 916                 return ERR_CAST(tfm);
 917
 918         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 919                 crypto_free_skcipher(tfm);
 920                 return ERR_PTR(-EINVAL);
 921         }
 922
 923         ctx = crypto_skcipher_ctx(tfm);
 924         refcount_set(&ctx->refcnt, 1);
 925
 926         return container_of(tfm, struct cryptd_skcipher, base);
 927 }
 928 EXPORT_SYMBOL_GPL(cryptd_alloc_skcipher);
 929
 930 struct crypto_skcipher *cryptd_skcipher_child(struct cryptd_skcipher *tfm)
 931 {
 932         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(&tfm->base);
 933
 934         return &ctx->child->base;
 935 }
 936 EXPORT_SYMBOL_GPL(cryptd_skcipher_child);
 937
 938 bool cryptd_skcipher_queued(struct cryptd_skcipher *tfm)
 939 {
 940         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(&tfm->base);
 941
 942         return refcount_read(&ctx->refcnt) - 1;
 943 }
 944 EXPORT_SYMBOL_GPL(cryptd_skcipher_queued);
 945
 946 void cryptd_free_skcipher(struct cryptd_skcipher *tfm)
 947 {
 948         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(&tfm->base);
 949
 950         if (refcount_dec_and_test(&ctx->refcnt))
 951                 crypto_free_skcipher(&tfm->base);
 952 }
 953 EXPORT_SYMBOL_GPL(cryptd_free_skcipher);
 954
 955 struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name,
 956                                         u32 type, u32 mask)
 957 {
 958         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 959         struct cryptd_hash_ctx *ctx;
 960         struct crypto_ahash *tfm;
 961
 962         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 963                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 964                 return ERR_PTR(-EINVAL);
 965         tfm = crypto_alloc_ahash(cryptd_alg_name, type, mask);
 966         if (IS_ERR(tfm))
 967                 return ERR_CAST(tfm);
 968         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 969                 crypto_free_ahash(tfm);
 970                 return ERR_PTR(-EINVAL);
 971         }
 972
 973         ctx = crypto_ahash_ctx(tfm);
 974         refcount_set(&ctx->refcnt, 1);
 975
 976         return __cryptd_ahash_cast(tfm);
 977 }
 978 EXPORT_SYMBOL_GPL(cryptd_alloc_ahash);
 979
 980 struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm)
 981 {
 982         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
 983
 984         return ctx->child;
 985 }
 986 EXPORT_SYMBOL_GPL(cryptd_ahash_child);
 987
 988 struct shash_desc *cryptd_shash_desc(struct ahash_request *req)
 989 {
 990         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 991         return &rctx->desc;
 992 }
 993 EXPORT_SYMBOL_GPL(cryptd_shash_desc);
 994
 995 bool cryptd_ahash_queued(struct cryptd_ahash *tfm)
 996 {
 997         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
 998
 999         return refcount_read(&ctx->refcnt) - 1;
1000 }
1001 EXPORT_SYMBOL_GPL(cryptd_ahash_queued);
1002
1003 void cryptd_free_ahash(struct cryptd_ahash *tfm)
1004 {
1005         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
1006
1007         if (refcount_dec_and_test(&ctx->refcnt))
1008                 crypto_free_ahash(&tfm->base);
1009 }
1010 EXPORT_SYMBOL_GPL(cryptd_free_ahash);
1011
1012 struct cryptd_aead *cryptd_alloc_aead(const char *alg_name,
1013                                                   u32 type, u32 mask)
1014 {
1015         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
1016         struct cryptd_aead_ctx *ctx;
1017         struct crypto_aead *tfm;
1018
1019         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
1020                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
1021                 return ERR_PTR(-EINVAL);
1022         tfm = crypto_alloc_aead(cryptd_alg_name, type, mask);
1023         if (IS_ERR(tfm))
1024                 return ERR_CAST(tfm);
1025         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
1026                 crypto_free_aead(tfm);
1027                 return ERR_PTR(-EINVAL);
1028         }
1029
1030         ctx = crypto_aead_ctx(tfm);
1031         refcount_set(&ctx->refcnt, 1);
1032
1033         return __cryptd_aead_cast(tfm);
1034 }
1035 EXPORT_SYMBOL_GPL(cryptd_alloc_aead);
1036
1037 struct crypto_aead *cryptd_aead_child(struct cryptd_aead *tfm)
1038 {
1039         struct cryptd_aead_ctx *ctx;
1040         ctx = crypto_aead_ctx(&tfm->base);
1041         return ctx->child;
1042 }
1043 EXPORT_SYMBOL_GPL(cryptd_aead_child);
1044
1045 bool cryptd_aead_queued(struct cryptd_aead *tfm)
1046 {
1047         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(&tfm->base);
1048
1049         return refcount_read(&ctx->refcnt) - 1;
1050 }
1051 EXPORT_SYMBOL_GPL(cryptd_aead_queued);
1052
1053 void cryptd_free_aead(struct cryptd_aead *tfm)
1054 {
1055         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(&tfm->base);
1056
1057         if (refcount_dec_and_test(&ctx->refcnt))
1058                 crypto_free_aead(&tfm->base);
1059 }
1060 EXPORT_SYMBOL_GPL(cryptd_free_aead);
1061
1062 static int __init cryptd_init(void)
1063 {
1064         int err;
1065
1066         cryptd_wq = alloc_workqueue("cryptd", WQ_MEM_RECLAIM | WQ_CPU_INTENSIVE,
1067                                     1);
1068         if (!cryptd_wq)
1069                 return -ENOMEM;
1070
1071         err = cryptd_init_queue(&queue, cryptd_max_cpu_qlen);
1072         if (err)
1073                 goto err_destroy_wq;
1074
1075         err = crypto_register_template(&cryptd_tmpl);
1076         if (err)
1077                 goto err_fini_queue;
1078
1079         return 0;
1080
1081 err_fini_queue:
1082         cryptd_fini_queue(&queue);
1083 err_destroy_wq:
1084         destroy_workqueue(cryptd_wq);
1085         return err;
1086 }
1087
1088 static void __exit cryptd_exit(void)
1089 {
1090         destroy_workqueue(cryptd_wq);
1091         cryptd_fini_queue(&queue);
1092         crypto_unregister_template(&cryptd_tmpl);
1093 }
1094
1095 subsys_initcall(cryptd_init);
1096 module_exit(cryptd_exit);
1097
1098 MODULE_LICENSE("GPL");
1099 MODULE_DESCRIPTION("Software async crypto daemon");
1100 MODULE_ALIAS_CRYPTO("cryptd");