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 void cryptd_type_and_mask(struct crypto_attr_type *algt,
 195                                  u32 *type, u32 *mask)
 196 {
 197         /*
 198          * cryptd is allowed to wrap internal algorithms, but in that case the
 199          * resulting cryptd instance will be marked as internal as well.
 200          */
 201         *type = algt->type & CRYPTO_ALG_INTERNAL;
 202         *mask = algt->mask & CRYPTO_ALG_INTERNAL;
 203
 204         /* No point in cryptd wrapping an algorithm that's already async. */
 205         *mask |= CRYPTO_ALG_ASYNC;
 206
 207         *mask |= crypto_algt_inherited_mask(algt);
 208 }
 209
 210 static int cryptd_init_instance(struct crypto_instance *inst,
 211                                 struct crypto_alg *alg)
 212 {
 213         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 214                      "cryptd(%s)",
 215                      alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 216                 return -ENAMETOOLONG;
 217
 218         memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
 219
 220         inst->alg.cra_priority = alg->cra_priority + 50;
 221         inst->alg.cra_blocksize = alg->cra_blocksize;
 222         inst->alg.cra_alignmask = alg->cra_alignmask;
 223
 224         return 0;
 225 }
 226
 227 static int cryptd_skcipher_setkey(struct crypto_skcipher *parent,
 228                                   const u8 *key, unsigned int keylen)
 229 {
 230         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(parent);
 231         struct crypto_sync_skcipher *child = ctx->child;
 232
 233         crypto_sync_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 234         crypto_sync_skcipher_set_flags(child,
 235                                        crypto_skcipher_get_flags(parent) &
 236                                          CRYPTO_TFM_REQ_MASK);
 237         return crypto_sync_skcipher_setkey(child, key, keylen);
 238 }
 239
 240 static void cryptd_skcipher_complete(struct skcipher_request *req, int err)
 241 {
 242         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 243         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 244         struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req);
 245         int refcnt = refcount_read(&ctx->refcnt);
 246
 247         local_bh_disable();
 248         rctx->complete(&req->base, err);
 249         local_bh_enable();
 250
 251         if (err != -EINPROGRESS && refcnt && refcount_dec_and_test(&ctx->refcnt))
 252                 crypto_free_skcipher(tfm);
 253 }
 254
 255 static void cryptd_skcipher_encrypt(struct crypto_async_request *base,
 256                                     int err)
 257 {
 258         struct skcipher_request *req = skcipher_request_cast(base);
 259         struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req);
 260         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 261         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 262         struct crypto_sync_skcipher *child = ctx->child;
 263         SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, child);
 264
 265         if (unlikely(err == -EINPROGRESS))
 266                 goto out;
 267
 268         skcipher_request_set_sync_tfm(subreq, child);
 269         skcipher_request_set_callback(subreq, CRYPTO_TFM_REQ_MAY_SLEEP,
 270                                       NULL, NULL);
 271         skcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
 272                                    req->iv);
 273
 274         err = crypto_skcipher_encrypt(subreq);
 275         skcipher_request_zero(subreq);
 276
 277         req->base.complete = rctx->complete;
 278
 279 out:
 280         cryptd_skcipher_complete(req, err);
 281 }
 282
 283 static void cryptd_skcipher_decrypt(struct crypto_async_request *base,
 284                                     int err)
 285 {
 286         struct skcipher_request *req = skcipher_request_cast(base);
 287         struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req);
 288         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 289         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 290         struct crypto_sync_skcipher *child = ctx->child;
 291         SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, child);
 292
 293         if (unlikely(err == -EINPROGRESS))
 294                 goto out;
 295
 296         skcipher_request_set_sync_tfm(subreq, child);
 297         skcipher_request_set_callback(subreq, CRYPTO_TFM_REQ_MAY_SLEEP,
 298                                       NULL, NULL);
 299         skcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
 300                                    req->iv);
 301
 302         err = crypto_skcipher_decrypt(subreq);
 303         skcipher_request_zero(subreq);
 304
 305         req->base.complete = rctx->complete;
 306
 307 out:
 308         cryptd_skcipher_complete(req, err);
 309 }
 310
 311 static int cryptd_skcipher_enqueue(struct skcipher_request *req,
 312                                    crypto_completion_t compl)
 313 {
 314         struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req);
 315         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 316         struct cryptd_queue *queue;
 317
 318         queue = cryptd_get_queue(crypto_skcipher_tfm(tfm));
 319         rctx->complete = req->base.complete;
 320         req->base.complete = compl;
 321
 322         return cryptd_enqueue_request(queue, &req->base);
 323 }
 324
 325 static int cryptd_skcipher_encrypt_enqueue(struct skcipher_request *req)
 326 {
 327         return cryptd_skcipher_enqueue(req, cryptd_skcipher_encrypt);
 328 }
 329
 330 static int cryptd_skcipher_decrypt_enqueue(struct skcipher_request *req)
 331 {
 332         return cryptd_skcipher_enqueue(req, cryptd_skcipher_decrypt);
 333 }
 334
 335 static int cryptd_skcipher_init_tfm(struct crypto_skcipher *tfm)
 336 {
 337         struct skcipher_instance *inst = skcipher_alg_instance(tfm);
 338         struct skcipherd_instance_ctx *ictx = skcipher_instance_ctx(inst);
 339         struct crypto_skcipher_spawn *spawn = &ictx->spawn;
 340         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 341         struct crypto_skcipher *cipher;
 342
 343         cipher = crypto_spawn_skcipher(spawn);
 344         if (IS_ERR(cipher))
 345                 return PTR_ERR(cipher);
 346
 347         ctx->child = (struct crypto_sync_skcipher *)cipher;
 348         crypto_skcipher_set_reqsize(
 349                 tfm, sizeof(struct cryptd_skcipher_request_ctx));
 350         return 0;
 351 }
 352
 353 static void cryptd_skcipher_exit_tfm(struct crypto_skcipher *tfm)
 354 {
 355         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 356
 357         crypto_free_sync_skcipher(ctx->child);
 358 }
 359
 360 static void cryptd_skcipher_free(struct skcipher_instance *inst)
 361 {
 362         struct skcipherd_instance_ctx *ctx = skcipher_instance_ctx(inst);
 363
 364         crypto_drop_skcipher(&ctx->spawn);
 365         kfree(inst);
 366 }
 367
 368 static int cryptd_create_skcipher(struct crypto_template *tmpl,
 369                                   struct rtattr **tb,
 370                                   struct crypto_attr_type *algt,
 371                                   struct cryptd_queue *queue)
 372 {
 373         struct skcipherd_instance_ctx *ctx;
 374         struct skcipher_instance *inst;
 375         struct skcipher_alg *alg;
 376         u32 type;
 377         u32 mask;
 378         int err;
 379
 380         cryptd_type_and_mask(algt, &type, &mask);
 381
 382         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 383         if (!inst)
 384                 return -ENOMEM;
 385
 386         ctx = skcipher_instance_ctx(inst);
 387         ctx->queue = queue;
 388
 389         err = crypto_grab_skcipher(&ctx->spawn, skcipher_crypto_instance(inst),
 390                                    crypto_attr_alg_name(tb[1]), type, mask);
 391         if (err)
 392                 goto err_free_inst;
 393
 394         alg = crypto_spawn_skcipher_alg(&ctx->spawn);
 395         err = cryptd_init_instance(skcipher_crypto_instance(inst), &alg->base);
 396         if (err)
 397                 goto err_free_inst;
 398
 399         inst->alg.base.cra_flags |= CRYPTO_ALG_ASYNC |
 400                 (alg->base.cra_flags & CRYPTO_ALG_INTERNAL);
 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 crypto_attr_type *algt,
 637                               struct cryptd_queue *queue)
 638 {
 639         struct hashd_instance_ctx *ctx;
 640         struct ahash_instance *inst;
 641         struct shash_alg *alg;
 642         u32 type;
 643         u32 mask;
 644         int err;
 645
 646         cryptd_type_and_mask(algt, &type, &mask);
 647
 648         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 649         if (!inst)
 650                 return -ENOMEM;
 651
 652         ctx = ahash_instance_ctx(inst);
 653         ctx->queue = queue;
 654
 655         err = crypto_grab_shash(&ctx->spawn, ahash_crypto_instance(inst),
 656                                 crypto_attr_alg_name(tb[1]), type, mask);
 657         if (err)
 658                 goto err_free_inst;
 659         alg = crypto_spawn_shash_alg(&ctx->spawn);
 660
 661         err = cryptd_init_instance(ahash_crypto_instance(inst), &alg->base);
 662         if (err)
 663                 goto err_free_inst;
 664
 665         inst->alg.halg.base.cra_flags |= CRYPTO_ALG_ASYNC |
 666                 (alg->base.cra_flags & (CRYPTO_ALG_INTERNAL|
 667                                         CRYPTO_ALG_OPTIONAL_KEY));
 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 crypto_attr_type *algt,
 824                               struct cryptd_queue *queue)
 825 {
 826         struct aead_instance_ctx *ctx;
 827         struct aead_instance *inst;
 828         struct aead_alg *alg;
 829         u32 type;
 830         u32 mask;
 831         int err;
 832
 833         cryptd_type_and_mask(algt, &type, &mask);
 834
 835         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 836         if (!inst)
 837                 return -ENOMEM;
 838
 839         ctx = aead_instance_ctx(inst);
 840         ctx->queue = queue;
 841
 842         err = crypto_grab_aead(&ctx->aead_spawn, aead_crypto_instance(inst),
 843                                crypto_attr_alg_name(tb[1]), type, mask);
 844         if (err)
 845                 goto err_free_inst;
 846
 847         alg = crypto_spawn_aead_alg(&ctx->aead_spawn);
 848         err = cryptd_init_instance(aead_crypto_instance(inst), &alg->base);
 849         if (err)
 850                 goto err_free_inst;
 851
 852         inst->alg.base.cra_flags |= CRYPTO_ALG_ASYNC |
 853                 (alg->base.cra_flags & CRYPTO_ALG_INTERNAL);
 854         inst->alg.base.cra_ctxsize = sizeof(struct cryptd_aead_ctx);
 855
 856         inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
 857         inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
 858
 859         inst->alg.init = cryptd_aead_init_tfm;
 860         inst->alg.exit = cryptd_aead_exit_tfm;
 861         inst->alg.setkey = cryptd_aead_setkey;
 862         inst->alg.setauthsize = cryptd_aead_setauthsize;
 863         inst->alg.encrypt = cryptd_aead_encrypt_enqueue;
 864         inst->alg.decrypt = cryptd_aead_decrypt_enqueue;
 865
 866         inst->free = cryptd_aead_free;
 867
 868         err = aead_register_instance(tmpl, inst);
 869         if (err) {
 870 err_free_inst:
 871                 cryptd_aead_free(inst);
 872         }
 873         return err;
 874 }
 875
 876 static struct cryptd_queue queue;
 877
 878 static int cryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
 879 {
 880         struct crypto_attr_type *algt;
 881
 882         algt = crypto_get_attr_type(tb);
 883         if (IS_ERR(algt))
 884                 return PTR_ERR(algt);
 885
 886         switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
 887         case CRYPTO_ALG_TYPE_SKCIPHER:
 888                 return cryptd_create_skcipher(tmpl, tb, algt, &queue);
 889         case CRYPTO_ALG_TYPE_HASH:
 890                 return cryptd_create_hash(tmpl, tb, algt, &queue);
 891         case CRYPTO_ALG_TYPE_AEAD:
 892                 return cryptd_create_aead(tmpl, tb, algt, &queue);
 893         }
 894
 895         return -EINVAL;
 896 }
 897
 898 static struct crypto_template cryptd_tmpl = {
 899         .name = "cryptd",
 900         .create = cryptd_create,
 901         .module = THIS_MODULE,
 902 };
 903
 904 struct cryptd_skcipher *cryptd_alloc_skcipher(const char *alg_name,
 905                                               u32 type, u32 mask)
 906 {
 907         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 908         struct cryptd_skcipher_ctx *ctx;
 909         struct crypto_skcipher *tfm;
 910
 911         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 912                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 913                 return ERR_PTR(-EINVAL);
 914
 915         tfm = crypto_alloc_skcipher(cryptd_alg_name, type, mask);
 916         if (IS_ERR(tfm))
 917                 return ERR_CAST(tfm);
 918
 919         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 920                 crypto_free_skcipher(tfm);
 921                 return ERR_PTR(-EINVAL);
 922         }
 923
 924         ctx = crypto_skcipher_ctx(tfm);
 925         refcount_set(&ctx->refcnt, 1);
 926
 927         return container_of(tfm, struct cryptd_skcipher, base);
 928 }
 929 EXPORT_SYMBOL_GPL(cryptd_alloc_skcipher);
 930
 931 struct crypto_skcipher *cryptd_skcipher_child(struct cryptd_skcipher *tfm)
 932 {
 933         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(&tfm->base);
 934
 935         return &ctx->child->base;
 936 }
 937 EXPORT_SYMBOL_GPL(cryptd_skcipher_child);
 938
 939 bool cryptd_skcipher_queued(struct cryptd_skcipher *tfm)
 940 {
 941         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(&tfm->base);
 942
 943         return refcount_read(&ctx->refcnt) - 1;
 944 }
 945 EXPORT_SYMBOL_GPL(cryptd_skcipher_queued);
 946
 947 void cryptd_free_skcipher(struct cryptd_skcipher *tfm)
 948 {
 949         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(&tfm->base);
 950
 951         if (refcount_dec_and_test(&ctx->refcnt))
 952                 crypto_free_skcipher(&tfm->base);
 953 }
 954 EXPORT_SYMBOL_GPL(cryptd_free_skcipher);
 955
 956 struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name,
 957                                         u32 type, u32 mask)
 958 {
 959         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 960         struct cryptd_hash_ctx *ctx;
 961         struct crypto_ahash *tfm;
 962
 963         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 964                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 965                 return ERR_PTR(-EINVAL);
 966         tfm = crypto_alloc_ahash(cryptd_alg_name, type, mask);
 967         if (IS_ERR(tfm))
 968                 return ERR_CAST(tfm);
 969         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 970                 crypto_free_ahash(tfm);
 971                 return ERR_PTR(-EINVAL);
 972         }
 973
 974         ctx = crypto_ahash_ctx(tfm);
 975         refcount_set(&ctx->refcnt, 1);
 976
 977         return __cryptd_ahash_cast(tfm);
 978 }
 979 EXPORT_SYMBOL_GPL(cryptd_alloc_ahash);
 980
 981 struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm)
 982 {
 983         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
 984
 985         return ctx->child;
 986 }
 987 EXPORT_SYMBOL_GPL(cryptd_ahash_child);
 988
 989 struct shash_desc *cryptd_shash_desc(struct ahash_request *req)
 990 {
 991         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 992         return &rctx->desc;
 993 }
 994 EXPORT_SYMBOL_GPL(cryptd_shash_desc);
 995
 996 bool cryptd_ahash_queued(struct cryptd_ahash *tfm)
 997 {
 998         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
 999
1000         return refcount_read(&ctx->refcnt) - 1;
1001 }
1002 EXPORT_SYMBOL_GPL(cryptd_ahash_queued);
1003
1004 void cryptd_free_ahash(struct cryptd_ahash *tfm)
1005 {
1006         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
1007
1008         if (refcount_dec_and_test(&ctx->refcnt))
1009                 crypto_free_ahash(&tfm->base);
1010 }
1011 EXPORT_SYMBOL_GPL(cryptd_free_ahash);
1012
1013 struct cryptd_aead *cryptd_alloc_aead(const char *alg_name,
1014                                                   u32 type, u32 mask)
1015 {
1016         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
1017         struct cryptd_aead_ctx *ctx;
1018         struct crypto_aead *tfm;
1019
1020         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
1021                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
1022                 return ERR_PTR(-EINVAL);
1023         tfm = crypto_alloc_aead(cryptd_alg_name, type, mask);
1024         if (IS_ERR(tfm))
1025                 return ERR_CAST(tfm);
1026         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
1027                 crypto_free_aead(tfm);
1028                 return ERR_PTR(-EINVAL);
1029         }
1030
1031         ctx = crypto_aead_ctx(tfm);
1032         refcount_set(&ctx->refcnt, 1);
1033
1034         return __cryptd_aead_cast(tfm);
1035 }
1036 EXPORT_SYMBOL_GPL(cryptd_alloc_aead);
1037
1038 struct crypto_aead *cryptd_aead_child(struct cryptd_aead *tfm)
1039 {
1040         struct cryptd_aead_ctx *ctx;
1041         ctx = crypto_aead_ctx(&tfm->base);
1042         return ctx->child;
1043 }
1044 EXPORT_SYMBOL_GPL(cryptd_aead_child);
1045
1046 bool cryptd_aead_queued(struct cryptd_aead *tfm)
1047 {
1048         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(&tfm->base);
1049
1050         return refcount_read(&ctx->refcnt) - 1;
1051 }
1052 EXPORT_SYMBOL_GPL(cryptd_aead_queued);
1053
1054 void cryptd_free_aead(struct cryptd_aead *tfm)
1055 {
1056         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(&tfm->base);
1057
1058         if (refcount_dec_and_test(&ctx->refcnt))
1059                 crypto_free_aead(&tfm->base);
1060 }
1061 EXPORT_SYMBOL_GPL(cryptd_free_aead);
1062
1063 static int __init cryptd_init(void)
1064 {
1065         int err;
1066
1067         cryptd_wq = alloc_workqueue("cryptd", WQ_MEM_RECLAIM | WQ_CPU_INTENSIVE,
1068                                     1);
1069         if (!cryptd_wq)
1070                 return -ENOMEM;
1071
1072         err = cryptd_init_queue(&queue, cryptd_max_cpu_qlen);
1073         if (err)
1074                 goto err_destroy_wq;
1075
1076         err = crypto_register_template(&cryptd_tmpl);
1077         if (err)
1078                 goto err_fini_queue;
1079
1080         return 0;
1081
1082 err_fini_queue:
1083         cryptd_fini_queue(&queue);
1084 err_destroy_wq:
1085         destroy_workqueue(cryptd_wq);
1086         return err;
1087 }
1088
1089 static void __exit cryptd_exit(void)
1090 {
1091         destroy_workqueue(cryptd_wq);
1092         cryptd_fini_queue(&queue);
1093         crypto_unregister_template(&cryptd_tmpl);
1094 }
1095
1096 subsys_initcall(cryptd_init);
1097 module_exit(cryptd_exit);
1098
1099 MODULE_LICENSE("GPL");
1100 MODULE_DESCRIPTION("Software async crypto daemon");
1101 MODULE_ALIAS_CRYPTO("cryptd");