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         const char *name;
 373         u32 type;
 374         u32 mask;
 375         int err;
 376
 377         type = 0;
 378         mask = CRYPTO_ALG_ASYNC;
 379
 380         cryptd_check_internal(tb, &type, &mask);
 381
 382         name = crypto_attr_alg_name(tb[1]);
 383         if (IS_ERR(name))
 384                 return PTR_ERR(name);
 385
 386         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 387         if (!inst)
 388                 return -ENOMEM;
 389
 390         ctx = skcipher_instance_ctx(inst);
 391         ctx->queue = queue;
 392
 393         err = crypto_grab_skcipher(&ctx->spawn, skcipher_crypto_instance(inst),
 394                                    name, type, mask);
 395         if (err)
 396                 goto out_free_inst;
 397
 398         alg = crypto_spawn_skcipher_alg(&ctx->spawn);
 399         err = cryptd_init_instance(skcipher_crypto_instance(inst), &alg->base);
 400         if (err)
 401                 goto out_drop_skcipher;
 402
 403         inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC |
 404                                    (alg->base.cra_flags & CRYPTO_ALG_INTERNAL);
 405
 406         inst->alg.ivsize = crypto_skcipher_alg_ivsize(alg);
 407         inst->alg.chunksize = crypto_skcipher_alg_chunksize(alg);
 408         inst->alg.min_keysize = crypto_skcipher_alg_min_keysize(alg);
 409         inst->alg.max_keysize = crypto_skcipher_alg_max_keysize(alg);
 410
 411         inst->alg.base.cra_ctxsize = sizeof(struct cryptd_skcipher_ctx);
 412
 413         inst->alg.init = cryptd_skcipher_init_tfm;
 414         inst->alg.exit = cryptd_skcipher_exit_tfm;
 415
 416         inst->alg.setkey = cryptd_skcipher_setkey;
 417         inst->alg.encrypt = cryptd_skcipher_encrypt_enqueue;
 418         inst->alg.decrypt = cryptd_skcipher_decrypt_enqueue;
 419
 420         inst->free = cryptd_skcipher_free;
 421
 422         err = skcipher_register_instance(tmpl, inst);
 423         if (err) {
 424 out_drop_skcipher:
 425                 crypto_drop_skcipher(&ctx->spawn);
 426 out_free_inst:
 427                 kfree(inst);
 428         }
 429         return err;
 430 }
 431
 432 static int cryptd_hash_init_tfm(struct crypto_tfm *tfm)
 433 {
 434         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 435         struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst);
 436         struct crypto_shash_spawn *spawn = &ictx->spawn;
 437         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 438         struct crypto_shash *hash;
 439
 440         hash = crypto_spawn_shash(spawn);
 441         if (IS_ERR(hash))
 442                 return PTR_ERR(hash);
 443
 444         ctx->child = hash;
 445         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 446                                  sizeof(struct cryptd_hash_request_ctx) +
 447                                  crypto_shash_descsize(hash));
 448         return 0;
 449 }
 450
 451 static void cryptd_hash_exit_tfm(struct crypto_tfm *tfm)
 452 {
 453         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 454
 455         crypto_free_shash(ctx->child);
 456 }
 457
 458 static int cryptd_hash_setkey(struct crypto_ahash *parent,
 459                                    const u8 *key, unsigned int keylen)
 460 {
 461         struct cryptd_hash_ctx *ctx   = crypto_ahash_ctx(parent);
 462         struct crypto_shash *child = ctx->child;
 463
 464         crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 465         crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) &
 466                                       CRYPTO_TFM_REQ_MASK);
 467         return crypto_shash_setkey(child, key, keylen);
 468 }
 469
 470 static int cryptd_hash_enqueue(struct ahash_request *req,
 471                                 crypto_completion_t compl)
 472 {
 473         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 474         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 475         struct cryptd_queue *queue =
 476                 cryptd_get_queue(crypto_ahash_tfm(tfm));
 477
 478         rctx->complete = req->base.complete;
 479         req->base.complete = compl;
 480
 481         return cryptd_enqueue_request(queue, &req->base);
 482 }
 483
 484 static void cryptd_hash_complete(struct ahash_request *req, int err)
 485 {
 486         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 487         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 488         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 489         int refcnt = refcount_read(&ctx->refcnt);
 490
 491         local_bh_disable();
 492         rctx->complete(&req->base, err);
 493         local_bh_enable();
 494
 495         if (err != -EINPROGRESS && refcnt && refcount_dec_and_test(&ctx->refcnt))
 496                 crypto_free_ahash(tfm);
 497 }
 498
 499 static void cryptd_hash_init(struct crypto_async_request *req_async, int err)
 500 {
 501         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 502         struct crypto_shash *child = ctx->child;
 503         struct ahash_request *req = ahash_request_cast(req_async);
 504         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 505         struct shash_desc *desc = &rctx->desc;
 506
 507         if (unlikely(err == -EINPROGRESS))
 508                 goto out;
 509
 510         desc->tfm = child;
 511
 512         err = crypto_shash_init(desc);
 513
 514         req->base.complete = rctx->complete;
 515
 516 out:
 517         cryptd_hash_complete(req, err);
 518 }
 519
 520 static int cryptd_hash_init_enqueue(struct ahash_request *req)
 521 {
 522         return cryptd_hash_enqueue(req, cryptd_hash_init);
 523 }
 524
 525 static void cryptd_hash_update(struct crypto_async_request *req_async, int err)
 526 {
 527         struct ahash_request *req = ahash_request_cast(req_async);
 528         struct cryptd_hash_request_ctx *rctx;
 529
 530         rctx = ahash_request_ctx(req);
 531
 532         if (unlikely(err == -EINPROGRESS))
 533                 goto out;
 534
 535         err = shash_ahash_update(req, &rctx->desc);
 536
 537         req->base.complete = rctx->complete;
 538
 539 out:
 540         cryptd_hash_complete(req, err);
 541 }
 542
 543 static int cryptd_hash_update_enqueue(struct ahash_request *req)
 544 {
 545         return cryptd_hash_enqueue(req, cryptd_hash_update);
 546 }
 547
 548 static void cryptd_hash_final(struct crypto_async_request *req_async, int err)
 549 {
 550         struct ahash_request *req = ahash_request_cast(req_async);
 551         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 552
 553         if (unlikely(err == -EINPROGRESS))
 554                 goto out;
 555
 556         err = crypto_shash_final(&rctx->desc, req->result);
 557
 558         req->base.complete = rctx->complete;
 559
 560 out:
 561         cryptd_hash_complete(req, err);
 562 }
 563
 564 static int cryptd_hash_final_enqueue(struct ahash_request *req)
 565 {
 566         return cryptd_hash_enqueue(req, cryptd_hash_final);
 567 }
 568
 569 static void cryptd_hash_finup(struct crypto_async_request *req_async, int err)
 570 {
 571         struct ahash_request *req = ahash_request_cast(req_async);
 572         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 573
 574         if (unlikely(err == -EINPROGRESS))
 575                 goto out;
 576
 577         err = shash_ahash_finup(req, &rctx->desc);
 578
 579         req->base.complete = rctx->complete;
 580
 581 out:
 582         cryptd_hash_complete(req, err);
 583 }
 584
 585 static int cryptd_hash_finup_enqueue(struct ahash_request *req)
 586 {
 587         return cryptd_hash_enqueue(req, cryptd_hash_finup);
 588 }
 589
 590 static void cryptd_hash_digest(struct crypto_async_request *req_async, int err)
 591 {
 592         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 593         struct crypto_shash *child = ctx->child;
 594         struct ahash_request *req = ahash_request_cast(req_async);
 595         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 596         struct shash_desc *desc = &rctx->desc;
 597
 598         if (unlikely(err == -EINPROGRESS))
 599                 goto out;
 600
 601         desc->tfm = child;
 602
 603         err = shash_ahash_digest(req, desc);
 604
 605         req->base.complete = rctx->complete;
 606
 607 out:
 608         cryptd_hash_complete(req, err);
 609 }
 610
 611 static int cryptd_hash_digest_enqueue(struct ahash_request *req)
 612 {
 613         return cryptd_hash_enqueue(req, cryptd_hash_digest);
 614 }
 615
 616 static int cryptd_hash_export(struct ahash_request *req, void *out)
 617 {
 618         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 619
 620         return crypto_shash_export(&rctx->desc, out);
 621 }
 622
 623 static int cryptd_hash_import(struct ahash_request *req, const void *in)
 624 {
 625         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 626         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 627         struct shash_desc *desc = cryptd_shash_desc(req);
 628
 629         desc->tfm = ctx->child;
 630
 631         return crypto_shash_import(desc, in);
 632 }
 633
 634 static void cryptd_hash_free(struct ahash_instance *inst)
 635 {
 636         struct hashd_instance_ctx *ctx = ahash_instance_ctx(inst);
 637
 638         crypto_drop_shash(&ctx->spawn);
 639         kfree(inst);
 640 }
 641
 642 static int cryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
 643                               struct cryptd_queue *queue)
 644 {
 645         struct hashd_instance_ctx *ctx;
 646         struct ahash_instance *inst;
 647         struct shash_alg *alg;
 648         u32 type = 0;
 649         u32 mask = 0;
 650         int err;
 651
 652         cryptd_check_internal(tb, &type, &mask);
 653
 654         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 655         if (!inst)
 656                 return -ENOMEM;
 657
 658         ctx = ahash_instance_ctx(inst);
 659         ctx->queue = queue;
 660
 661         err = crypto_grab_shash(&ctx->spawn, ahash_crypto_instance(inst),
 662                                 crypto_attr_alg_name(tb[1]), type, mask);
 663         if (err)
 664                 goto err_free_inst;
 665         alg = crypto_spawn_shash_alg(&ctx->spawn);
 666
 667         err = cryptd_init_instance(ahash_crypto_instance(inst), &alg->base);
 668         if (err)
 669                 goto err_free_inst;
 670
 671         inst->alg.halg.base.cra_flags = CRYPTO_ALG_ASYNC |
 672                 (alg->base.cra_flags & (CRYPTO_ALG_INTERNAL |
 673                                         CRYPTO_ALG_OPTIONAL_KEY));
 674
 675         inst->alg.halg.digestsize = alg->digestsize;
 676         inst->alg.halg.statesize = alg->statesize;
 677         inst->alg.halg.base.cra_ctxsize = sizeof(struct cryptd_hash_ctx);
 678
 679         inst->alg.halg.base.cra_init = cryptd_hash_init_tfm;
 680         inst->alg.halg.base.cra_exit = cryptd_hash_exit_tfm;
 681
 682         inst->alg.init   = cryptd_hash_init_enqueue;
 683         inst->alg.update = cryptd_hash_update_enqueue;
 684         inst->alg.final  = cryptd_hash_final_enqueue;
 685         inst->alg.finup  = cryptd_hash_finup_enqueue;
 686         inst->alg.export = cryptd_hash_export;
 687         inst->alg.import = cryptd_hash_import;
 688         if (crypto_shash_alg_has_setkey(alg))
 689                 inst->alg.setkey = cryptd_hash_setkey;
 690         inst->alg.digest = cryptd_hash_digest_enqueue;
 691
 692         inst->free = cryptd_hash_free;
 693
 694         err = ahash_register_instance(tmpl, inst);
 695         if (err) {
 696 err_free_inst:
 697                 crypto_drop_shash(&ctx->spawn);
 698                 kfree(inst);
 699         }
 700         return err;
 701 }
 702
 703 static int cryptd_aead_setkey(struct crypto_aead *parent,
 704                               const u8 *key, unsigned int keylen)
 705 {
 706         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(parent);
 707         struct crypto_aead *child = ctx->child;
 708
 709         return crypto_aead_setkey(child, key, keylen);
 710 }
 711
 712 static int cryptd_aead_setauthsize(struct crypto_aead *parent,
 713                                    unsigned int authsize)
 714 {
 715         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(parent);
 716         struct crypto_aead *child = ctx->child;
 717
 718         return crypto_aead_setauthsize(child, authsize);
 719 }
 720
 721 static void cryptd_aead_crypt(struct aead_request *req,
 722                         struct crypto_aead *child,
 723                         int err,
 724                         int (*crypt)(struct aead_request *req))
 725 {
 726         struct cryptd_aead_request_ctx *rctx;
 727         struct cryptd_aead_ctx *ctx;
 728         crypto_completion_t compl;
 729         struct crypto_aead *tfm;
 730         int refcnt;
 731
 732         rctx = aead_request_ctx(req);
 733         compl = rctx->complete;
 734
 735         tfm = crypto_aead_reqtfm(req);
 736
 737         if (unlikely(err == -EINPROGRESS))
 738                 goto out;
 739         aead_request_set_tfm(req, child);
 740         err = crypt( req );
 741
 742 out:
 743         ctx = crypto_aead_ctx(tfm);
 744         refcnt = refcount_read(&ctx->refcnt);
 745
 746         local_bh_disable();
 747         compl(&req->base, err);
 748         local_bh_enable();
 749
 750         if (err != -EINPROGRESS && refcnt && refcount_dec_and_test(&ctx->refcnt))
 751                 crypto_free_aead(tfm);
 752 }
 753
 754 static void cryptd_aead_encrypt(struct crypto_async_request *areq, int err)
 755 {
 756         struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
 757         struct crypto_aead *child = ctx->child;
 758         struct aead_request *req;
 759
 760         req = container_of(areq, struct aead_request, base);
 761         cryptd_aead_crypt(req, child, err, crypto_aead_alg(child)->encrypt);
 762 }
 763
 764 static void cryptd_aead_decrypt(struct crypto_async_request *areq, int err)
 765 {
 766         struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
 767         struct crypto_aead *child = ctx->child;
 768         struct aead_request *req;
 769
 770         req = container_of(areq, struct aead_request, base);
 771         cryptd_aead_crypt(req, child, err, crypto_aead_alg(child)->decrypt);
 772 }
 773
 774 static int cryptd_aead_enqueue(struct aead_request *req,
 775                                     crypto_completion_t compl)
 776 {
 777         struct cryptd_aead_request_ctx *rctx = aead_request_ctx(req);
 778         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 779         struct cryptd_queue *queue = cryptd_get_queue(crypto_aead_tfm(tfm));
 780
 781         rctx->complete = req->base.complete;
 782         req->base.complete = compl;
 783         return cryptd_enqueue_request(queue, &req->base);
 784 }
 785
 786 static int cryptd_aead_encrypt_enqueue(struct aead_request *req)
 787 {
 788         return cryptd_aead_enqueue(req, cryptd_aead_encrypt );
 789 }
 790
 791 static int cryptd_aead_decrypt_enqueue(struct aead_request *req)
 792 {
 793         return cryptd_aead_enqueue(req, cryptd_aead_decrypt );
 794 }
 795
 796 static int cryptd_aead_init_tfm(struct crypto_aead *tfm)
 797 {
 798         struct aead_instance *inst = aead_alg_instance(tfm);
 799         struct aead_instance_ctx *ictx = aead_instance_ctx(inst);
 800         struct crypto_aead_spawn *spawn = &ictx->aead_spawn;
 801         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(tfm);
 802         struct crypto_aead *cipher;
 803
 804         cipher = crypto_spawn_aead(spawn);
 805         if (IS_ERR(cipher))
 806                 return PTR_ERR(cipher);
 807
 808         ctx->child = cipher;
 809         crypto_aead_set_reqsize(
 810                 tfm, max((unsigned)sizeof(struct cryptd_aead_request_ctx),
 811                          crypto_aead_reqsize(cipher)));
 812         return 0;
 813 }
 814
 815 static void cryptd_aead_exit_tfm(struct crypto_aead *tfm)
 816 {
 817         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(tfm);
 818         crypto_free_aead(ctx->child);
 819 }
 820
 821 static void cryptd_aead_free(struct aead_instance *inst)
 822 {
 823         struct aead_instance_ctx *ctx = aead_instance_ctx(inst);
 824
 825         crypto_drop_aead(&ctx->aead_spawn);
 826         kfree(inst);
 827 }
 828
 829 static int cryptd_create_aead(struct crypto_template *tmpl,
 830                               struct rtattr **tb,
 831                               struct cryptd_queue *queue)
 832 {
 833         struct aead_instance_ctx *ctx;
 834         struct aead_instance *inst;
 835         struct aead_alg *alg;
 836         const char *name;
 837         u32 type = 0;
 838         u32 mask = CRYPTO_ALG_ASYNC;
 839         int err;
 840
 841         cryptd_check_internal(tb, &type, &mask);
 842
 843         name = crypto_attr_alg_name(tb[1]);
 844         if (IS_ERR(name))
 845                 return PTR_ERR(name);
 846
 847         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 848         if (!inst)
 849                 return -ENOMEM;
 850
 851         ctx = aead_instance_ctx(inst);
 852         ctx->queue = queue;
 853
 854         err = crypto_grab_aead(&ctx->aead_spawn, aead_crypto_instance(inst),
 855                                name, type, mask);
 856         if (err)
 857                 goto out_free_inst;
 858
 859         alg = crypto_spawn_aead_alg(&ctx->aead_spawn);
 860         err = cryptd_init_instance(aead_crypto_instance(inst), &alg->base);
 861         if (err)
 862                 goto out_drop_aead;
 863
 864         inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC |
 865                                    (alg->base.cra_flags & CRYPTO_ALG_INTERNAL);
 866         inst->alg.base.cra_ctxsize = sizeof(struct cryptd_aead_ctx);
 867
 868         inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
 869         inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
 870
 871         inst->alg.init = cryptd_aead_init_tfm;
 872         inst->alg.exit = cryptd_aead_exit_tfm;
 873         inst->alg.setkey = cryptd_aead_setkey;
 874         inst->alg.setauthsize = cryptd_aead_setauthsize;
 875         inst->alg.encrypt = cryptd_aead_encrypt_enqueue;
 876         inst->alg.decrypt = cryptd_aead_decrypt_enqueue;
 877
 878         inst->free = cryptd_aead_free;
 879
 880         err = aead_register_instance(tmpl, inst);
 881         if (err) {
 882 out_drop_aead:
 883                 crypto_drop_aead(&ctx->aead_spawn);
 884 out_free_inst:
 885                 kfree(inst);
 886         }
 887         return err;
 888 }
 889
 890 static struct cryptd_queue queue;
 891
 892 static int cryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
 893 {
 894         struct crypto_attr_type *algt;
 895
 896         algt = crypto_get_attr_type(tb);
 897         if (IS_ERR(algt))
 898                 return PTR_ERR(algt);
 899
 900         switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
 901         case CRYPTO_ALG_TYPE_SKCIPHER:
 902                 return cryptd_create_skcipher(tmpl, tb, &queue);
 903         case CRYPTO_ALG_TYPE_HASH:
 904                 return cryptd_create_hash(tmpl, tb, &queue);
 905         case CRYPTO_ALG_TYPE_AEAD:
 906                 return cryptd_create_aead(tmpl, tb, &queue);
 907         }
 908
 909         return -EINVAL;
 910 }
 911
 912 static struct crypto_template cryptd_tmpl = {
 913         .name = "cryptd",
 914         .create = cryptd_create,
 915         .module = THIS_MODULE,
 916 };
 917
 918 struct cryptd_skcipher *cryptd_alloc_skcipher(const char *alg_name,
 919                                               u32 type, u32 mask)
 920 {
 921         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 922         struct cryptd_skcipher_ctx *ctx;
 923         struct crypto_skcipher *tfm;
 924
 925         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 926                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 927                 return ERR_PTR(-EINVAL);
 928
 929         tfm = crypto_alloc_skcipher(cryptd_alg_name, type, mask);
 930         if (IS_ERR(tfm))
 931                 return ERR_CAST(tfm);
 932
 933         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 934                 crypto_free_skcipher(tfm);
 935                 return ERR_PTR(-EINVAL);
 936         }
 937
 938         ctx = crypto_skcipher_ctx(tfm);
 939         refcount_set(&ctx->refcnt, 1);
 940
 941         return container_of(tfm, struct cryptd_skcipher, base);
 942 }
 943 EXPORT_SYMBOL_GPL(cryptd_alloc_skcipher);
 944
 945 struct crypto_skcipher *cryptd_skcipher_child(struct cryptd_skcipher *tfm)
 946 {
 947         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(&tfm->base);
 948
 949         return &ctx->child->base;
 950 }
 951 EXPORT_SYMBOL_GPL(cryptd_skcipher_child);
 952
 953 bool cryptd_skcipher_queued(struct cryptd_skcipher *tfm)
 954 {
 955         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(&tfm->base);
 956
 957         return refcount_read(&ctx->refcnt) - 1;
 958 }
 959 EXPORT_SYMBOL_GPL(cryptd_skcipher_queued);
 960
 961 void cryptd_free_skcipher(struct cryptd_skcipher *tfm)
 962 {
 963         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(&tfm->base);
 964
 965         if (refcount_dec_and_test(&ctx->refcnt))
 966                 crypto_free_skcipher(&tfm->base);
 967 }
 968 EXPORT_SYMBOL_GPL(cryptd_free_skcipher);
 969
 970 struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name,
 971                                         u32 type, u32 mask)
 972 {
 973         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 974         struct cryptd_hash_ctx *ctx;
 975         struct crypto_ahash *tfm;
 976
 977         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 978                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 979                 return ERR_PTR(-EINVAL);
 980         tfm = crypto_alloc_ahash(cryptd_alg_name, type, mask);
 981         if (IS_ERR(tfm))
 982                 return ERR_CAST(tfm);
 983         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 984                 crypto_free_ahash(tfm);
 985                 return ERR_PTR(-EINVAL);
 986         }
 987
 988         ctx = crypto_ahash_ctx(tfm);
 989         refcount_set(&ctx->refcnt, 1);
 990
 991         return __cryptd_ahash_cast(tfm);
 992 }
 993 EXPORT_SYMBOL_GPL(cryptd_alloc_ahash);
 994
 995 struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm)
 996 {
 997         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
 998
 999         return ctx->child;
1000 }
1001 EXPORT_SYMBOL_GPL(cryptd_ahash_child);
1002
1003 struct shash_desc *cryptd_shash_desc(struct ahash_request *req)
1004 {
1005         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
1006         return &rctx->desc;
1007 }
1008 EXPORT_SYMBOL_GPL(cryptd_shash_desc);
1009
1010 bool cryptd_ahash_queued(struct cryptd_ahash *tfm)
1011 {
1012         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
1013
1014         return refcount_read(&ctx->refcnt) - 1;
1015 }
1016 EXPORT_SYMBOL_GPL(cryptd_ahash_queued);
1017
1018 void cryptd_free_ahash(struct cryptd_ahash *tfm)
1019 {
1020         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
1021
1022         if (refcount_dec_and_test(&ctx->refcnt))
1023                 crypto_free_ahash(&tfm->base);
1024 }
1025 EXPORT_SYMBOL_GPL(cryptd_free_ahash);
1026
1027 struct cryptd_aead *cryptd_alloc_aead(const char *alg_name,
1028                                                   u32 type, u32 mask)
1029 {
1030         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
1031         struct cryptd_aead_ctx *ctx;
1032         struct crypto_aead *tfm;
1033
1034         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
1035                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
1036                 return ERR_PTR(-EINVAL);
1037         tfm = crypto_alloc_aead(cryptd_alg_name, type, mask);
1038         if (IS_ERR(tfm))
1039                 return ERR_CAST(tfm);
1040         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
1041                 crypto_free_aead(tfm);
1042                 return ERR_PTR(-EINVAL);
1043         }
1044
1045         ctx = crypto_aead_ctx(tfm);
1046         refcount_set(&ctx->refcnt, 1);
1047
1048         return __cryptd_aead_cast(tfm);
1049 }
1050 EXPORT_SYMBOL_GPL(cryptd_alloc_aead);
1051
1052 struct crypto_aead *cryptd_aead_child(struct cryptd_aead *tfm)
1053 {
1054         struct cryptd_aead_ctx *ctx;
1055         ctx = crypto_aead_ctx(&tfm->base);
1056         return ctx->child;
1057 }
1058 EXPORT_SYMBOL_GPL(cryptd_aead_child);
1059
1060 bool cryptd_aead_queued(struct cryptd_aead *tfm)
1061 {
1062         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(&tfm->base);
1063
1064         return refcount_read(&ctx->refcnt) - 1;
1065 }
1066 EXPORT_SYMBOL_GPL(cryptd_aead_queued);
1067
1068 void cryptd_free_aead(struct cryptd_aead *tfm)
1069 {
1070         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(&tfm->base);
1071
1072         if (refcount_dec_and_test(&ctx->refcnt))
1073                 crypto_free_aead(&tfm->base);
1074 }
1075 EXPORT_SYMBOL_GPL(cryptd_free_aead);
1076
1077 static int __init cryptd_init(void)
1078 {
1079         int err;
1080
1081         cryptd_wq = alloc_workqueue("cryptd", WQ_MEM_RECLAIM | WQ_CPU_INTENSIVE,
1082                                     1);
1083         if (!cryptd_wq)
1084                 return -ENOMEM;
1085
1086         err = cryptd_init_queue(&queue, cryptd_max_cpu_qlen);
1087         if (err)
1088                 goto err_destroy_wq;
1089
1090         err = crypto_register_template(&cryptd_tmpl);
1091         if (err)
1092                 goto err_fini_queue;
1093
1094         return 0;
1095
1096 err_fini_queue:
1097         cryptd_fini_queue(&queue);
1098 err_destroy_wq:
1099         destroy_workqueue(cryptd_wq);
1100         return err;
1101 }
1102
1103 static void __exit cryptd_exit(void)
1104 {
1105         destroy_workqueue(cryptd_wq);
1106         cryptd_fini_queue(&queue);
1107         crypto_unregister_template(&cryptd_tmpl);
1108 }
1109
1110 subsys_initcall(cryptd_init);
1111 module_exit(cryptd_exit);
1112
1113 MODULE_LICENSE("GPL");
1114 MODULE_DESCRIPTION("Software async crypto daemon");
1115 MODULE_ALIAS_CRYPTO("cryptd");