crypto/cryptd.c

   1 /*
   2  * Software async crypto daemon.
   3  *
   4  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
   5  *
   6  * Added AEAD support to cryptd.
   7  *    Authors: Tadeusz Struk (tadeusz.struk@intel.com)
   8  *             Adrian Hoban <adrian.hoban@intel.com>
   9  *             Gabriele Paoloni <gabriele.paoloni@intel.com>
  10  *             Aidan O'Mahony (aidan.o.mahony@intel.com)
  11  *    Copyright (c) 2010, Intel Corporation.
  12  *
  13  * This program is free software; you can redistribute it and/or modify it
  14  * under the terms of the GNU General Public License as published by the Free
  15  * Software Foundation; either version 2 of the License, or (at your option)
  16  * any later version.
  17  *
  18  */
  19
  20 #include <crypto/algapi.h>
  21 #include <crypto/internal/hash.h>
  22 #include <crypto/internal/aead.h>
  23 #include <crypto/cryptd.h>
  24 #include <crypto/crypto_wq.h>
  25 #include <linux/err.h>
  26 #include <linux/init.h>
  27 #include <linux/kernel.h>
  28 #include <linux/list.h>
  29 #include <linux/module.h>
  30 #include <linux/scatterlist.h>
  31 #include <linux/sched.h>
  32 #include <linux/slab.h>
  33
  34 #define CRYPTD_MAX_CPU_QLEN 100
  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 hashd_instance_ctx {
  51         struct crypto_shash_spawn spawn;
  52         struct cryptd_queue *queue;
  53 };
  54
  55 struct aead_instance_ctx {
  56         struct crypto_aead_spawn aead_spawn;
  57         struct cryptd_queue *queue;
  58 };
  59
  60 struct cryptd_blkcipher_ctx {
  61         struct crypto_blkcipher *child;
  62 };
  63
  64 struct cryptd_blkcipher_request_ctx {
  65         crypto_completion_t complete;
  66 };
  67
  68 struct cryptd_hash_ctx {
  69         struct crypto_shash *child;
  70 };
  71
  72 struct cryptd_hash_request_ctx {
  73         crypto_completion_t complete;
  74         struct shash_desc desc;
  75 };
  76
  77 struct cryptd_aead_ctx {
  78         struct crypto_aead *child;
  79 };
  80
  81 struct cryptd_aead_request_ctx {
  82         crypto_completion_t complete;
  83 };
  84
  85 static void cryptd_queue_worker(struct work_struct *work);
  86
  87 static int cryptd_init_queue(struct cryptd_queue *queue,
  88                              unsigned int max_cpu_qlen)
  89 {
  90         int cpu;
  91         struct cryptd_cpu_queue *cpu_queue;
  92
  93         queue->cpu_queue = alloc_percpu(struct cryptd_cpu_queue);
  94         if (!queue->cpu_queue)
  95                 return -ENOMEM;
  96         for_each_possible_cpu(cpu) {
  97                 cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
  98                 crypto_init_queue(&cpu_queue->queue, max_cpu_qlen);
  99                 INIT_WORK(&cpu_queue->work, cryptd_queue_worker);
 100         }
 101         return 0;
 102 }
 103
 104 static void cryptd_fini_queue(struct cryptd_queue *queue)
 105 {
 106         int cpu;
 107         struct cryptd_cpu_queue *cpu_queue;
 108
 109         for_each_possible_cpu(cpu) {
 110                 cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
 111                 BUG_ON(cpu_queue->queue.qlen);
 112         }
 113         free_percpu(queue->cpu_queue);
 114 }
 115
 116 static int cryptd_enqueue_request(struct cryptd_queue *queue,
 117                                   struct crypto_async_request *request)
 118 {
 119         int cpu, err;
 120         struct cryptd_cpu_queue *cpu_queue;
 121
 122         cpu = get_cpu();
 123         cpu_queue = this_cpu_ptr(queue->cpu_queue);
 124         err = crypto_enqueue_request(&cpu_queue->queue, request);
 125         queue_work_on(cpu, kcrypto_wq, &cpu_queue->work);
 126         put_cpu();
 127
 128         return err;
 129 }
 130
 131 /* Called in workqueue context, do one real cryption work (via
 132  * req->complete) and reschedule itself if there are more work to
 133  * do. */
 134 static void cryptd_queue_worker(struct work_struct *work)
 135 {
 136         struct cryptd_cpu_queue *cpu_queue;
 137         struct crypto_async_request *req, *backlog;
 138
 139         cpu_queue = container_of(work, struct cryptd_cpu_queue, work);
 140         /* Only handle one request at a time to avoid hogging crypto
 141          * workqueue. preempt_disable/enable is used to prevent
 142          * being preempted by cryptd_enqueue_request() */
 143         preempt_disable();
 144         backlog = crypto_get_backlog(&cpu_queue->queue);
 145         req = crypto_dequeue_request(&cpu_queue->queue);
 146         preempt_enable();
 147
 148         if (!req)
 149                 return;
 150
 151         if (backlog)
 152                 backlog->complete(backlog, -EINPROGRESS);
 153         req->complete(req, 0);
 154
 155         if (cpu_queue->queue.qlen)
 156                 queue_work(kcrypto_wq, &cpu_queue->work);
 157 }
 158
 159 static inline struct cryptd_queue *cryptd_get_queue(struct crypto_tfm *tfm)
 160 {
 161         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 162         struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
 163         return ictx->queue;
 164 }
 165
 166 static int cryptd_blkcipher_setkey(struct crypto_ablkcipher *parent,
 167                                    const u8 *key, unsigned int keylen)
 168 {
 169         struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(parent);
 170         struct crypto_blkcipher *child = ctx->child;
 171         int err;
 172
 173         crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 174         crypto_blkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) &
 175                                           CRYPTO_TFM_REQ_MASK);
 176         err = crypto_blkcipher_setkey(child, key, keylen);
 177         crypto_ablkcipher_set_flags(parent, crypto_blkcipher_get_flags(child) &
 178                                             CRYPTO_TFM_RES_MASK);
 179         return err;
 180 }
 181
 182 static void cryptd_blkcipher_crypt(struct ablkcipher_request *req,
 183                                    struct crypto_blkcipher *child,
 184                                    int err,
 185                                    int (*crypt)(struct blkcipher_desc *desc,
 186                                                 struct scatterlist *dst,
 187                                                 struct scatterlist *src,
 188                                                 unsigned int len))
 189 {
 190         struct cryptd_blkcipher_request_ctx *rctx;
 191         struct blkcipher_desc desc;
 192
 193         rctx = ablkcipher_request_ctx(req);
 194
 195         if (unlikely(err == -EINPROGRESS))
 196                 goto out;
 197
 198         desc.tfm = child;
 199         desc.info = req->info;
 200         desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 201
 202         err = crypt(&desc, req->dst, req->src, req->nbytes);
 203
 204         req->base.complete = rctx->complete;
 205
 206 out:
 207         local_bh_disable();
 208         rctx->complete(&req->base, err);
 209         local_bh_enable();
 210 }
 211
 212 static void cryptd_blkcipher_encrypt(struct crypto_async_request *req, int err)
 213 {
 214         struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
 215         struct crypto_blkcipher *child = ctx->child;
 216
 217         cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
 218                                crypto_blkcipher_crt(child)->encrypt);
 219 }
 220
 221 static void cryptd_blkcipher_decrypt(struct crypto_async_request *req, int err)
 222 {
 223         struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
 224         struct crypto_blkcipher *child = ctx->child;
 225
 226         cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
 227                                crypto_blkcipher_crt(child)->decrypt);
 228 }
 229
 230 static int cryptd_blkcipher_enqueue(struct ablkcipher_request *req,
 231                                     crypto_completion_t complete)
 232 {
 233         struct cryptd_blkcipher_request_ctx *rctx = ablkcipher_request_ctx(req);
 234         struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
 235         struct cryptd_queue *queue;
 236
 237         queue = cryptd_get_queue(crypto_ablkcipher_tfm(tfm));
 238         rctx->complete = req->base.complete;
 239         req->base.complete = complete;
 240
 241         return cryptd_enqueue_request(queue, &req->base);
 242 }
 243
 244 static int cryptd_blkcipher_encrypt_enqueue(struct ablkcipher_request *req)
 245 {
 246         return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_encrypt);
 247 }
 248
 249 static int cryptd_blkcipher_decrypt_enqueue(struct ablkcipher_request *req)
 250 {
 251         return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_decrypt);
 252 }
 253
 254 static int cryptd_blkcipher_init_tfm(struct crypto_tfm *tfm)
 255 {
 256         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 257         struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
 258         struct crypto_spawn *spawn = &ictx->spawn;
 259         struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
 260         struct crypto_blkcipher *cipher;
 261
 262         cipher = crypto_spawn_blkcipher(spawn);
 263         if (IS_ERR(cipher))
 264                 return PTR_ERR(cipher);
 265
 266         ctx->child = cipher;
 267         tfm->crt_ablkcipher.reqsize =
 268                 sizeof(struct cryptd_blkcipher_request_ctx);
 269         return 0;
 270 }
 271
 272 static void cryptd_blkcipher_exit_tfm(struct crypto_tfm *tfm)
 273 {
 274         struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
 275
 276         crypto_free_blkcipher(ctx->child);
 277 }
 278
 279 static void *cryptd_alloc_instance(struct crypto_alg *alg, unsigned int head,
 280                                    unsigned int tail)
 281 {
 282         char *p;
 283         struct crypto_instance *inst;
 284         int err;
 285
 286         p = kzalloc(head + sizeof(*inst) + tail, GFP_KERNEL);
 287         if (!p)
 288                 return ERR_PTR(-ENOMEM);
 289
 290         inst = (void *)(p + head);
 291
 292         err = -ENAMETOOLONG;
 293         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 294                      "cryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 295                 goto out_free_inst;
 296
 297         memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
 298
 299         inst->alg.cra_priority = alg->cra_priority + 50;
 300         inst->alg.cra_blocksize = alg->cra_blocksize;
 301         inst->alg.cra_alignmask = alg->cra_alignmask;
 302
 303 out:
 304         return p;
 305
 306 out_free_inst:
 307         kfree(p);
 308         p = ERR_PTR(err);
 309         goto out;
 310 }
 311
 312 static int cryptd_create_blkcipher(struct crypto_template *tmpl,
 313                                    struct rtattr **tb,
 314                                    struct cryptd_queue *queue)
 315 {
 316         struct cryptd_instance_ctx *ctx;
 317         struct crypto_instance *inst;
 318         struct crypto_alg *alg;
 319         int err;
 320
 321         alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
 322                                   CRYPTO_ALG_TYPE_MASK);
 323         if (IS_ERR(alg))
 324                 return PTR_ERR(alg);
 325
 326         inst = cryptd_alloc_instance(alg, 0, sizeof(*ctx));
 327         err = PTR_ERR(inst);
 328         if (IS_ERR(inst))
 329                 goto out_put_alg;
 330
 331         ctx = crypto_instance_ctx(inst);
 332         ctx->queue = queue;
 333
 334         err = crypto_init_spawn(&ctx->spawn, alg, inst,
 335                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 336         if (err)
 337                 goto out_free_inst;
 338
 339         inst->alg.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC;
 340         inst->alg.cra_type = &crypto_ablkcipher_type;
 341
 342         inst->alg.cra_ablkcipher.ivsize = alg->cra_blkcipher.ivsize;
 343         inst->alg.cra_ablkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
 344         inst->alg.cra_ablkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
 345
 346         inst->alg.cra_ablkcipher.geniv = alg->cra_blkcipher.geniv;
 347
 348         inst->alg.cra_ctxsize = sizeof(struct cryptd_blkcipher_ctx);
 349
 350         inst->alg.cra_init = cryptd_blkcipher_init_tfm;
 351         inst->alg.cra_exit = cryptd_blkcipher_exit_tfm;
 352
 353         inst->alg.cra_ablkcipher.setkey = cryptd_blkcipher_setkey;
 354         inst->alg.cra_ablkcipher.encrypt = cryptd_blkcipher_encrypt_enqueue;
 355         inst->alg.cra_ablkcipher.decrypt = cryptd_blkcipher_decrypt_enqueue;
 356
 357         err = crypto_register_instance(tmpl, inst);
 358         if (err) {
 359                 crypto_drop_spawn(&ctx->spawn);
 360 out_free_inst:
 361                 kfree(inst);
 362         }
 363
 364 out_put_alg:
 365         crypto_mod_put(alg);
 366         return err;
 367 }
 368
 369 static int cryptd_hash_init_tfm(struct crypto_tfm *tfm)
 370 {
 371         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 372         struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst);
 373         struct crypto_shash_spawn *spawn = &ictx->spawn;
 374         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 375         struct crypto_shash *hash;
 376
 377         hash = crypto_spawn_shash(spawn);
 378         if (IS_ERR(hash))
 379                 return PTR_ERR(hash);
 380
 381         ctx->child = hash;
 382         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 383                                  sizeof(struct cryptd_hash_request_ctx) +
 384                                  crypto_shash_descsize(hash));
 385         return 0;
 386 }
 387
 388 static void cryptd_hash_exit_tfm(struct crypto_tfm *tfm)
 389 {
 390         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 391
 392         crypto_free_shash(ctx->child);
 393 }
 394
 395 static int cryptd_hash_setkey(struct crypto_ahash *parent,
 396                                    const u8 *key, unsigned int keylen)
 397 {
 398         struct cryptd_hash_ctx *ctx   = crypto_ahash_ctx(parent);
 399         struct crypto_shash *child = ctx->child;
 400         int err;
 401
 402         crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 403         crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) &
 404                                       CRYPTO_TFM_REQ_MASK);
 405         err = crypto_shash_setkey(child, key, keylen);
 406         crypto_ahash_set_flags(parent, crypto_shash_get_flags(child) &
 407                                        CRYPTO_TFM_RES_MASK);
 408         return err;
 409 }
 410
 411 static int cryptd_hash_enqueue(struct ahash_request *req,
 412                                 crypto_completion_t complete)
 413 {
 414         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 415         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 416         struct cryptd_queue *queue =
 417                 cryptd_get_queue(crypto_ahash_tfm(tfm));
 418
 419         rctx->complete = req->base.complete;
 420         req->base.complete = complete;
 421
 422         return cryptd_enqueue_request(queue, &req->base);
 423 }
 424
 425 static void cryptd_hash_init(struct crypto_async_request *req_async, int err)
 426 {
 427         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 428         struct crypto_shash *child = ctx->child;
 429         struct ahash_request *req = ahash_request_cast(req_async);
 430         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 431         struct shash_desc *desc = &rctx->desc;
 432
 433         if (unlikely(err == -EINPROGRESS))
 434                 goto out;
 435
 436         desc->tfm = child;
 437         desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 438
 439         err = crypto_shash_init(desc);
 440
 441         req->base.complete = rctx->complete;
 442
 443 out:
 444         local_bh_disable();
 445         rctx->complete(&req->base, err);
 446         local_bh_enable();
 447 }
 448
 449 static int cryptd_hash_init_enqueue(struct ahash_request *req)
 450 {
 451         return cryptd_hash_enqueue(req, cryptd_hash_init);
 452 }
 453
 454 static void cryptd_hash_update(struct crypto_async_request *req_async, int err)
 455 {
 456         struct ahash_request *req = ahash_request_cast(req_async);
 457         struct cryptd_hash_request_ctx *rctx;
 458
 459         rctx = ahash_request_ctx(req);
 460
 461         if (unlikely(err == -EINPROGRESS))
 462                 goto out;
 463
 464         err = shash_ahash_update(req, &rctx->desc);
 465
 466         req->base.complete = rctx->complete;
 467
 468 out:
 469         local_bh_disable();
 470         rctx->complete(&req->base, err);
 471         local_bh_enable();
 472 }
 473
 474 static int cryptd_hash_update_enqueue(struct ahash_request *req)
 475 {
 476         return cryptd_hash_enqueue(req, cryptd_hash_update);
 477 }
 478
 479 static void cryptd_hash_final(struct crypto_async_request *req_async, int err)
 480 {
 481         struct ahash_request *req = ahash_request_cast(req_async);
 482         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 483
 484         if (unlikely(err == -EINPROGRESS))
 485                 goto out;
 486
 487         err = crypto_shash_final(&rctx->desc, req->result);
 488
 489         req->base.complete = rctx->complete;
 490
 491 out:
 492         local_bh_disable();
 493         rctx->complete(&req->base, err);
 494         local_bh_enable();
 495 }
 496
 497 static int cryptd_hash_final_enqueue(struct ahash_request *req)
 498 {
 499         return cryptd_hash_enqueue(req, cryptd_hash_final);
 500 }
 501
 502 static void cryptd_hash_finup(struct crypto_async_request *req_async, int err)
 503 {
 504         struct ahash_request *req = ahash_request_cast(req_async);
 505         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 506
 507         if (unlikely(err == -EINPROGRESS))
 508                 goto out;
 509
 510         err = shash_ahash_finup(req, &rctx->desc);
 511
 512         req->base.complete = rctx->complete;
 513
 514 out:
 515         local_bh_disable();
 516         rctx->complete(&req->base, err);
 517         local_bh_enable();
 518 }
 519
 520 static int cryptd_hash_finup_enqueue(struct ahash_request *req)
 521 {
 522         return cryptd_hash_enqueue(req, cryptd_hash_finup);
 523 }
 524
 525 static void cryptd_hash_digest(struct crypto_async_request *req_async, int err)
 526 {
 527         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 528         struct crypto_shash *child = ctx->child;
 529         struct ahash_request *req = ahash_request_cast(req_async);
 530         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 531         struct shash_desc *desc = &rctx->desc;
 532
 533         if (unlikely(err == -EINPROGRESS))
 534                 goto out;
 535
 536         desc->tfm = child;
 537         desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 538
 539         err = shash_ahash_digest(req, desc);
 540
 541         req->base.complete = rctx->complete;
 542
 543 out:
 544         local_bh_disable();
 545         rctx->complete(&req->base, err);
 546         local_bh_enable();
 547 }
 548
 549 static int cryptd_hash_digest_enqueue(struct ahash_request *req)
 550 {
 551         return cryptd_hash_enqueue(req, cryptd_hash_digest);
 552 }
 553
 554 static int cryptd_hash_export(struct ahash_request *req, void *out)
 555 {
 556         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 557
 558         return crypto_shash_export(&rctx->desc, out);
 559 }
 560
 561 static int cryptd_hash_import(struct ahash_request *req, const void *in)
 562 {
 563         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 564
 565         return crypto_shash_import(&rctx->desc, in);
 566 }
 567
 568 static int cryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
 569                               struct cryptd_queue *queue)
 570 {
 571         struct hashd_instance_ctx *ctx;
 572         struct ahash_instance *inst;
 573         struct shash_alg *salg;
 574         struct crypto_alg *alg;
 575         int err;
 576
 577         salg = shash_attr_alg(tb[1], 0, 0);
 578         if (IS_ERR(salg))
 579                 return PTR_ERR(salg);
 580
 581         alg = &salg->base;
 582         inst = cryptd_alloc_instance(alg, ahash_instance_headroom(),
 583                                      sizeof(*ctx));
 584         err = PTR_ERR(inst);
 585         if (IS_ERR(inst))
 586                 goto out_put_alg;
 587
 588         ctx = ahash_instance_ctx(inst);
 589         ctx->queue = queue;
 590
 591         err = crypto_init_shash_spawn(&ctx->spawn, salg,
 592                                       ahash_crypto_instance(inst));
 593         if (err)
 594                 goto out_free_inst;
 595
 596         inst->alg.halg.base.cra_flags = CRYPTO_ALG_ASYNC;
 597
 598         inst->alg.halg.digestsize = salg->digestsize;
 599         inst->alg.halg.base.cra_ctxsize = sizeof(struct cryptd_hash_ctx);
 600
 601         inst->alg.halg.base.cra_init = cryptd_hash_init_tfm;
 602         inst->alg.halg.base.cra_exit = cryptd_hash_exit_tfm;
 603
 604         inst->alg.init   = cryptd_hash_init_enqueue;
 605         inst->alg.update = cryptd_hash_update_enqueue;
 606         inst->alg.final  = cryptd_hash_final_enqueue;
 607         inst->alg.finup  = cryptd_hash_finup_enqueue;
 608         inst->alg.export = cryptd_hash_export;
 609         inst->alg.import = cryptd_hash_import;
 610         inst->alg.setkey = cryptd_hash_setkey;
 611         inst->alg.digest = cryptd_hash_digest_enqueue;
 612
 613         err = ahash_register_instance(tmpl, inst);
 614         if (err) {
 615                 crypto_drop_shash(&ctx->spawn);
 616 out_free_inst:
 617                 kfree(inst);
 618         }
 619
 620 out_put_alg:
 621         crypto_mod_put(alg);
 622         return err;
 623 }
 624
 625 static void cryptd_aead_crypt(struct aead_request *req,
 626                         struct crypto_aead *child,
 627                         int err,
 628                         int (*crypt)(struct aead_request *req))
 629 {
 630         struct cryptd_aead_request_ctx *rctx;
 631         rctx = aead_request_ctx(req);
 632
 633         if (unlikely(err == -EINPROGRESS))
 634                 goto out;
 635         aead_request_set_tfm(req, child);
 636         err = crypt( req );
 637         req->base.complete = rctx->complete;
 638 out:
 639         local_bh_disable();
 640         rctx->complete(&req->base, err);
 641         local_bh_enable();
 642 }
 643
 644 static void cryptd_aead_encrypt(struct crypto_async_request *areq, int err)
 645 {
 646         struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
 647         struct crypto_aead *child = ctx->child;
 648         struct aead_request *req;
 649
 650         req = container_of(areq, struct aead_request, base);
 651         cryptd_aead_crypt(req, child, err, crypto_aead_crt(child)->encrypt);
 652 }
 653
 654 static void cryptd_aead_decrypt(struct crypto_async_request *areq, int err)
 655 {
 656         struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
 657         struct crypto_aead *child = ctx->child;
 658         struct aead_request *req;
 659
 660         req = container_of(areq, struct aead_request, base);
 661         cryptd_aead_crypt(req, child, err, crypto_aead_crt(child)->decrypt);
 662 }
 663
 664 static int cryptd_aead_enqueue(struct aead_request *req,
 665                                     crypto_completion_t complete)
 666 {
 667         struct cryptd_aead_request_ctx *rctx = aead_request_ctx(req);
 668         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 669         struct cryptd_queue *queue = cryptd_get_queue(crypto_aead_tfm(tfm));
 670
 671         rctx->complete = req->base.complete;
 672         req->base.complete = complete;
 673         return cryptd_enqueue_request(queue, &req->base);
 674 }
 675
 676 static int cryptd_aead_encrypt_enqueue(struct aead_request *req)
 677 {
 678         return cryptd_aead_enqueue(req, cryptd_aead_encrypt );
 679 }
 680
 681 static int cryptd_aead_decrypt_enqueue(struct aead_request *req)
 682 {
 683         return cryptd_aead_enqueue(req, cryptd_aead_decrypt );
 684 }
 685
 686 static int cryptd_aead_init_tfm(struct crypto_tfm *tfm)
 687 {
 688         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 689         struct aead_instance_ctx *ictx = crypto_instance_ctx(inst);
 690         struct crypto_aead_spawn *spawn = &ictx->aead_spawn;
 691         struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(tfm);
 692         struct crypto_aead *cipher;
 693
 694         cipher = crypto_spawn_aead(spawn);
 695         if (IS_ERR(cipher))
 696                 return PTR_ERR(cipher);
 697
 698         crypto_aead_set_flags(cipher, CRYPTO_TFM_REQ_MAY_SLEEP);
 699         ctx->child = cipher;
 700         tfm->crt_aead.reqsize = sizeof(struct cryptd_aead_request_ctx);
 701         return 0;
 702 }
 703
 704 static void cryptd_aead_exit_tfm(struct crypto_tfm *tfm)
 705 {
 706         struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(tfm);
 707         crypto_free_aead(ctx->child);
 708 }
 709
 710 static int cryptd_create_aead(struct crypto_template *tmpl,
 711                               struct rtattr **tb,
 712                               struct cryptd_queue *queue)
 713 {
 714         struct aead_instance_ctx *ctx;
 715         struct crypto_instance *inst;
 716         struct crypto_alg *alg;
 717         int err;
 718
 719         alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_AEAD,
 720                                 CRYPTO_ALG_TYPE_MASK);
 721         if (IS_ERR(alg))
 722                 return PTR_ERR(alg);
 723
 724         inst = cryptd_alloc_instance(alg, 0, sizeof(*ctx));
 725         err = PTR_ERR(inst);
 726         if (IS_ERR(inst))
 727                 goto out_put_alg;
 728
 729         ctx = crypto_instance_ctx(inst);
 730         ctx->queue = queue;
 731
 732         err = crypto_init_spawn(&ctx->aead_spawn.base, alg, inst,
 733                         CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 734         if (err)
 735                 goto out_free_inst;
 736
 737         inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC;
 738         inst->alg.cra_type = alg->cra_type;
 739         inst->alg.cra_ctxsize = sizeof(struct cryptd_aead_ctx);
 740         inst->alg.cra_init = cryptd_aead_init_tfm;
 741         inst->alg.cra_exit = cryptd_aead_exit_tfm;
 742         inst->alg.cra_aead.setkey      = alg->cra_aead.setkey;
 743         inst->alg.cra_aead.setauthsize = alg->cra_aead.setauthsize;
 744         inst->alg.cra_aead.geniv       = alg->cra_aead.geniv;
 745         inst->alg.cra_aead.ivsize      = alg->cra_aead.ivsize;
 746         inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;
 747         inst->alg.cra_aead.encrypt     = cryptd_aead_encrypt_enqueue;
 748         inst->alg.cra_aead.decrypt     = cryptd_aead_decrypt_enqueue;
 749         inst->alg.cra_aead.givencrypt  = alg->cra_aead.givencrypt;
 750         inst->alg.cra_aead.givdecrypt  = alg->cra_aead.givdecrypt;
 751
 752         err = crypto_register_instance(tmpl, inst);
 753         if (err) {
 754                 crypto_drop_spawn(&ctx->aead_spawn.base);
 755 out_free_inst:
 756                 kfree(inst);
 757         }
 758 out_put_alg:
 759         crypto_mod_put(alg);
 760         return err;
 761 }
 762
 763 static struct cryptd_queue queue;
 764
 765 static int cryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
 766 {
 767         struct crypto_attr_type *algt;
 768
 769         algt = crypto_get_attr_type(tb);
 770         if (IS_ERR(algt))
 771                 return PTR_ERR(algt);
 772
 773         switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
 774         case CRYPTO_ALG_TYPE_BLKCIPHER:
 775                 return cryptd_create_blkcipher(tmpl, tb, &queue);
 776         case CRYPTO_ALG_TYPE_DIGEST:
 777                 return cryptd_create_hash(tmpl, tb, &queue);
 778         case CRYPTO_ALG_TYPE_AEAD:
 779                 return cryptd_create_aead(tmpl, tb, &queue);
 780         }
 781
 782         return -EINVAL;
 783 }
 784
 785 static void cryptd_free(struct crypto_instance *inst)
 786 {
 787         struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
 788         struct hashd_instance_ctx *hctx = crypto_instance_ctx(inst);
 789         struct aead_instance_ctx *aead_ctx = crypto_instance_ctx(inst);
 790
 791         switch (inst->alg.cra_flags & CRYPTO_ALG_TYPE_MASK) {
 792         case CRYPTO_ALG_TYPE_AHASH:
 793                 crypto_drop_shash(&hctx->spawn);
 794                 kfree(ahash_instance(inst));
 795                 return;
 796         case CRYPTO_ALG_TYPE_AEAD:
 797                 crypto_drop_spawn(&aead_ctx->aead_spawn.base);
 798                 kfree(inst);
 799                 return;
 800         default:
 801                 crypto_drop_spawn(&ctx->spawn);
 802                 kfree(inst);
 803         }
 804 }
 805
 806 static struct crypto_template cryptd_tmpl = {
 807         .name = "cryptd",
 808         .create = cryptd_create,
 809         .free = cryptd_free,
 810         .module = THIS_MODULE,
 811 };
 812
 813 struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name,
 814                                                   u32 type, u32 mask)
 815 {
 816         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 817         struct crypto_tfm *tfm;
 818
 819         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 820                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 821                 return ERR_PTR(-EINVAL);
 822         type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
 823         type |= CRYPTO_ALG_TYPE_BLKCIPHER;
 824         mask &= ~CRYPTO_ALG_TYPE_MASK;
 825         mask |= (CRYPTO_ALG_GENIV | CRYPTO_ALG_TYPE_BLKCIPHER_MASK);
 826         tfm = crypto_alloc_base(cryptd_alg_name, type, mask);
 827         if (IS_ERR(tfm))
 828                 return ERR_CAST(tfm);
 829         if (tfm->__crt_alg->cra_module != THIS_MODULE) {
 830                 crypto_free_tfm(tfm);
 831                 return ERR_PTR(-EINVAL);
 832         }
 833
 834         return __cryptd_ablkcipher_cast(__crypto_ablkcipher_cast(tfm));
 835 }
 836 EXPORT_SYMBOL_GPL(cryptd_alloc_ablkcipher);
 837
 838 struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm)
 839 {
 840         struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base);
 841         return ctx->child;
 842 }
 843 EXPORT_SYMBOL_GPL(cryptd_ablkcipher_child);
 844
 845 void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm)
 846 {
 847         crypto_free_ablkcipher(&tfm->base);
 848 }
 849 EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher);
 850
 851 struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name,
 852                                         u32 type, u32 mask)
 853 {
 854         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 855         struct crypto_ahash *tfm;
 856
 857         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 858                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 859                 return ERR_PTR(-EINVAL);
 860         tfm = crypto_alloc_ahash(cryptd_alg_name, type, mask);
 861         if (IS_ERR(tfm))
 862                 return ERR_CAST(tfm);
 863         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 864                 crypto_free_ahash(tfm);
 865                 return ERR_PTR(-EINVAL);
 866         }
 867
 868         return __cryptd_ahash_cast(tfm);
 869 }
 870 EXPORT_SYMBOL_GPL(cryptd_alloc_ahash);
 871
 872 struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm)
 873 {
 874         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
 875
 876         return ctx->child;
 877 }
 878 EXPORT_SYMBOL_GPL(cryptd_ahash_child);
 879
 880 struct shash_desc *cryptd_shash_desc(struct ahash_request *req)
 881 {
 882         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 883         return &rctx->desc;
 884 }
 885 EXPORT_SYMBOL_GPL(cryptd_shash_desc);
 886
 887 void cryptd_free_ahash(struct cryptd_ahash *tfm)
 888 {
 889         crypto_free_ahash(&tfm->base);
 890 }
 891 EXPORT_SYMBOL_GPL(cryptd_free_ahash);
 892
 893 struct cryptd_aead *cryptd_alloc_aead(const char *alg_name,
 894                                                   u32 type, u32 mask)
 895 {
 896         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 897         struct crypto_aead *tfm;
 898
 899         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 900                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 901                 return ERR_PTR(-EINVAL);
 902         tfm = crypto_alloc_aead(cryptd_alg_name, type, mask);
 903         if (IS_ERR(tfm))
 904                 return ERR_CAST(tfm);
 905         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 906                 crypto_free_aead(tfm);
 907                 return ERR_PTR(-EINVAL);
 908         }
 909         return __cryptd_aead_cast(tfm);
 910 }
 911 EXPORT_SYMBOL_GPL(cryptd_alloc_aead);
 912
 913 struct crypto_aead *cryptd_aead_child(struct cryptd_aead *tfm)
 914 {
 915         struct cryptd_aead_ctx *ctx;
 916         ctx = crypto_aead_ctx(&tfm->base);
 917         return ctx->child;
 918 }
 919 EXPORT_SYMBOL_GPL(cryptd_aead_child);
 920
 921 void cryptd_free_aead(struct cryptd_aead *tfm)
 922 {
 923         crypto_free_aead(&tfm->base);
 924 }
 925 EXPORT_SYMBOL_GPL(cryptd_free_aead);
 926
 927 static int __init cryptd_init(void)
 928 {
 929         int err;
 930
 931         err = cryptd_init_queue(&queue, CRYPTD_MAX_CPU_QLEN);
 932         if (err)
 933                 return err;
 934
 935         err = crypto_register_template(&cryptd_tmpl);
 936         if (err)
 937                 cryptd_fini_queue(&queue);
 938
 939         return err;
 940 }
 941
 942 static void __exit cryptd_exit(void)
 943 {
 944         cryptd_fini_queue(&queue);
 945         crypto_unregister_template(&cryptd_tmpl);
 946 }
 947
 948 subsys_initcall(cryptd_init);
 949 module_exit(cryptd_exit);
 950
 951 MODULE_LICENSE("GPL");
 952 MODULE_DESCRIPTION("Software async crypto daemon");