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         /*
 141          * Only handle one request at a time to avoid hogging crypto workqueue.
 142          * preempt_disable/enable is used to prevent being preempted by
 143          * cryptd_enqueue_request(). local_bh_disable/enable is used to prevent
 144          * cryptd_enqueue_request() being accessed from software interrupts.
 145          */
 146         local_bh_disable();
 147         preempt_disable();
 148         backlog = crypto_get_backlog(&cpu_queue->queue);
 149         req = crypto_dequeue_request(&cpu_queue->queue);
 150         preempt_enable();
 151         local_bh_enable();
 152
 153         if (!req)
 154                 return;
 155
 156         if (backlog)
 157                 backlog->complete(backlog, -EINPROGRESS);
 158         req->complete(req, 0);
 159
 160         if (cpu_queue->queue.qlen)
 161                 queue_work(kcrypto_wq, &cpu_queue->work);
 162 }
 163
 164 static inline struct cryptd_queue *cryptd_get_queue(struct crypto_tfm *tfm)
 165 {
 166         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 167         struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
 168         return ictx->queue;
 169 }
 170
 171 static int cryptd_blkcipher_setkey(struct crypto_ablkcipher *parent,
 172                                    const u8 *key, unsigned int keylen)
 173 {
 174         struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(parent);
 175         struct crypto_blkcipher *child = ctx->child;
 176         int err;
 177
 178         crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 179         crypto_blkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) &
 180                                           CRYPTO_TFM_REQ_MASK);
 181         err = crypto_blkcipher_setkey(child, key, keylen);
 182         crypto_ablkcipher_set_flags(parent, crypto_blkcipher_get_flags(child) &
 183                                             CRYPTO_TFM_RES_MASK);
 184         return err;
 185 }
 186
 187 static void cryptd_blkcipher_crypt(struct ablkcipher_request *req,
 188                                    struct crypto_blkcipher *child,
 189                                    int err,
 190                                    int (*crypt)(struct blkcipher_desc *desc,
 191                                                 struct scatterlist *dst,
 192                                                 struct scatterlist *src,
 193                                                 unsigned int len))
 194 {
 195         struct cryptd_blkcipher_request_ctx *rctx;
 196         struct blkcipher_desc desc;
 197
 198         rctx = ablkcipher_request_ctx(req);
 199
 200         if (unlikely(err == -EINPROGRESS))
 201                 goto out;
 202
 203         desc.tfm = child;
 204         desc.info = req->info;
 205         desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 206
 207         err = crypt(&desc, req->dst, req->src, req->nbytes);
 208
 209         req->base.complete = rctx->complete;
 210
 211 out:
 212         local_bh_disable();
 213         rctx->complete(&req->base, err);
 214         local_bh_enable();
 215 }
 216
 217 static void cryptd_blkcipher_encrypt(struct crypto_async_request *req, int err)
 218 {
 219         struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
 220         struct crypto_blkcipher *child = ctx->child;
 221
 222         cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
 223                                crypto_blkcipher_crt(child)->encrypt);
 224 }
 225
 226 static void cryptd_blkcipher_decrypt(struct crypto_async_request *req, int err)
 227 {
 228         struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
 229         struct crypto_blkcipher *child = ctx->child;
 230
 231         cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
 232                                crypto_blkcipher_crt(child)->decrypt);
 233 }
 234
 235 static int cryptd_blkcipher_enqueue(struct ablkcipher_request *req,
 236                                     crypto_completion_t complete)
 237 {
 238         struct cryptd_blkcipher_request_ctx *rctx = ablkcipher_request_ctx(req);
 239         struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
 240         struct cryptd_queue *queue;
 241
 242         queue = cryptd_get_queue(crypto_ablkcipher_tfm(tfm));
 243         rctx->complete = req->base.complete;
 244         req->base.complete = complete;
 245
 246         return cryptd_enqueue_request(queue, &req->base);
 247 }
 248
 249 static int cryptd_blkcipher_encrypt_enqueue(struct ablkcipher_request *req)
 250 {
 251         return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_encrypt);
 252 }
 253
 254 static int cryptd_blkcipher_decrypt_enqueue(struct ablkcipher_request *req)
 255 {
 256         return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_decrypt);
 257 }
 258
 259 static int cryptd_blkcipher_init_tfm(struct crypto_tfm *tfm)
 260 {
 261         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 262         struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
 263         struct crypto_spawn *spawn = &ictx->spawn;
 264         struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
 265         struct crypto_blkcipher *cipher;
 266
 267         cipher = crypto_spawn_blkcipher(spawn);
 268         if (IS_ERR(cipher))
 269                 return PTR_ERR(cipher);
 270
 271         ctx->child = cipher;
 272         tfm->crt_ablkcipher.reqsize =
 273                 sizeof(struct cryptd_blkcipher_request_ctx);
 274         return 0;
 275 }
 276
 277 static void cryptd_blkcipher_exit_tfm(struct crypto_tfm *tfm)
 278 {
 279         struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
 280
 281         crypto_free_blkcipher(ctx->child);
 282 }
 283
 284 static void *cryptd_alloc_instance(struct crypto_alg *alg, unsigned int head,
 285                                    unsigned int tail)
 286 {
 287         char *p;
 288         struct crypto_instance *inst;
 289         int err;
 290
 291         p = kzalloc(head + sizeof(*inst) + tail, GFP_KERNEL);
 292         if (!p)
 293                 return ERR_PTR(-ENOMEM);
 294
 295         inst = (void *)(p + head);
 296
 297         err = -ENAMETOOLONG;
 298         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 299                      "cryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 300                 goto out_free_inst;
 301
 302         memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
 303
 304         inst->alg.cra_priority = alg->cra_priority + 50;
 305         inst->alg.cra_blocksize = alg->cra_blocksize;
 306         inst->alg.cra_alignmask = alg->cra_alignmask;
 307
 308 out:
 309         return p;
 310
 311 out_free_inst:
 312         kfree(p);
 313         p = ERR_PTR(err);
 314         goto out;
 315 }
 316
 317 static int cryptd_create_blkcipher(struct crypto_template *tmpl,
 318                                    struct rtattr **tb,
 319                                    struct cryptd_queue *queue)
 320 {
 321         struct cryptd_instance_ctx *ctx;
 322         struct crypto_instance *inst;
 323         struct crypto_alg *alg;
 324         int err;
 325
 326         alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
 327                                   CRYPTO_ALG_TYPE_MASK);
 328         if (IS_ERR(alg))
 329                 return PTR_ERR(alg);
 330
 331         inst = cryptd_alloc_instance(alg, 0, sizeof(*ctx));
 332         err = PTR_ERR(inst);
 333         if (IS_ERR(inst))
 334                 goto out_put_alg;
 335
 336         ctx = crypto_instance_ctx(inst);
 337         ctx->queue = queue;
 338
 339         err = crypto_init_spawn(&ctx->spawn, alg, inst,
 340                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 341         if (err)
 342                 goto out_free_inst;
 343
 344         inst->alg.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC;
 345         inst->alg.cra_type = &crypto_ablkcipher_type;
 346
 347         inst->alg.cra_ablkcipher.ivsize = alg->cra_blkcipher.ivsize;
 348         inst->alg.cra_ablkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
 349         inst->alg.cra_ablkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
 350
 351         inst->alg.cra_ablkcipher.geniv = alg->cra_blkcipher.geniv;
 352
 353         inst->alg.cra_ctxsize = sizeof(struct cryptd_blkcipher_ctx);
 354
 355         inst->alg.cra_init = cryptd_blkcipher_init_tfm;
 356         inst->alg.cra_exit = cryptd_blkcipher_exit_tfm;
 357
 358         inst->alg.cra_ablkcipher.setkey = cryptd_blkcipher_setkey;
 359         inst->alg.cra_ablkcipher.encrypt = cryptd_blkcipher_encrypt_enqueue;
 360         inst->alg.cra_ablkcipher.decrypt = cryptd_blkcipher_decrypt_enqueue;
 361
 362         err = crypto_register_instance(tmpl, inst);
 363         if (err) {
 364                 crypto_drop_spawn(&ctx->spawn);
 365 out_free_inst:
 366                 kfree(inst);
 367         }
 368
 369 out_put_alg:
 370         crypto_mod_put(alg);
 371         return err;
 372 }
 373
 374 static int cryptd_hash_init_tfm(struct crypto_tfm *tfm)
 375 {
 376         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 377         struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst);
 378         struct crypto_shash_spawn *spawn = &ictx->spawn;
 379         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 380         struct crypto_shash *hash;
 381
 382         hash = crypto_spawn_shash(spawn);
 383         if (IS_ERR(hash))
 384                 return PTR_ERR(hash);
 385
 386         ctx->child = hash;
 387         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 388                                  sizeof(struct cryptd_hash_request_ctx) +
 389                                  crypto_shash_descsize(hash));
 390         return 0;
 391 }
 392
 393 static void cryptd_hash_exit_tfm(struct crypto_tfm *tfm)
 394 {
 395         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 396
 397         crypto_free_shash(ctx->child);
 398 }
 399
 400 static int cryptd_hash_setkey(struct crypto_ahash *parent,
 401                                    const u8 *key, unsigned int keylen)
 402 {
 403         struct cryptd_hash_ctx *ctx   = crypto_ahash_ctx(parent);
 404         struct crypto_shash *child = ctx->child;
 405         int err;
 406
 407         crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 408         crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) &
 409                                       CRYPTO_TFM_REQ_MASK);
 410         err = crypto_shash_setkey(child, key, keylen);
 411         crypto_ahash_set_flags(parent, crypto_shash_get_flags(child) &
 412                                        CRYPTO_TFM_RES_MASK);
 413         return err;
 414 }
 415
 416 static int cryptd_hash_enqueue(struct ahash_request *req,
 417                                 crypto_completion_t complete)
 418 {
 419         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 420         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 421         struct cryptd_queue *queue =
 422                 cryptd_get_queue(crypto_ahash_tfm(tfm));
 423
 424         rctx->complete = req->base.complete;
 425         req->base.complete = complete;
 426
 427         return cryptd_enqueue_request(queue, &req->base);
 428 }
 429
 430 static void cryptd_hash_init(struct crypto_async_request *req_async, int err)
 431 {
 432         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 433         struct crypto_shash *child = ctx->child;
 434         struct ahash_request *req = ahash_request_cast(req_async);
 435         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 436         struct shash_desc *desc = &rctx->desc;
 437
 438         if (unlikely(err == -EINPROGRESS))
 439                 goto out;
 440
 441         desc->tfm = child;
 442         desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 443
 444         err = crypto_shash_init(desc);
 445
 446         req->base.complete = rctx->complete;
 447
 448 out:
 449         local_bh_disable();
 450         rctx->complete(&req->base, err);
 451         local_bh_enable();
 452 }
 453
 454 static int cryptd_hash_init_enqueue(struct ahash_request *req)
 455 {
 456         return cryptd_hash_enqueue(req, cryptd_hash_init);
 457 }
 458
 459 static void cryptd_hash_update(struct crypto_async_request *req_async, int err)
 460 {
 461         struct ahash_request *req = ahash_request_cast(req_async);
 462         struct cryptd_hash_request_ctx *rctx;
 463
 464         rctx = ahash_request_ctx(req);
 465
 466         if (unlikely(err == -EINPROGRESS))
 467                 goto out;
 468
 469         err = shash_ahash_update(req, &rctx->desc);
 470
 471         req->base.complete = rctx->complete;
 472
 473 out:
 474         local_bh_disable();
 475         rctx->complete(&req->base, err);
 476         local_bh_enable();
 477 }
 478
 479 static int cryptd_hash_update_enqueue(struct ahash_request *req)
 480 {
 481         return cryptd_hash_enqueue(req, cryptd_hash_update);
 482 }
 483
 484 static void cryptd_hash_final(struct crypto_async_request *req_async, int err)
 485 {
 486         struct ahash_request *req = ahash_request_cast(req_async);
 487         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 488
 489         if (unlikely(err == -EINPROGRESS))
 490                 goto out;
 491
 492         err = crypto_shash_final(&rctx->desc, req->result);
 493
 494         req->base.complete = rctx->complete;
 495
 496 out:
 497         local_bh_disable();
 498         rctx->complete(&req->base, err);
 499         local_bh_enable();
 500 }
 501
 502 static int cryptd_hash_final_enqueue(struct ahash_request *req)
 503 {
 504         return cryptd_hash_enqueue(req, cryptd_hash_final);
 505 }
 506
 507 static void cryptd_hash_finup(struct crypto_async_request *req_async, int err)
 508 {
 509         struct ahash_request *req = ahash_request_cast(req_async);
 510         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 511
 512         if (unlikely(err == -EINPROGRESS))
 513                 goto out;
 514
 515         err = shash_ahash_finup(req, &rctx->desc);
 516
 517         req->base.complete = rctx->complete;
 518
 519 out:
 520         local_bh_disable();
 521         rctx->complete(&req->base, err);
 522         local_bh_enable();
 523 }
 524
 525 static int cryptd_hash_finup_enqueue(struct ahash_request *req)
 526 {
 527         return cryptd_hash_enqueue(req, cryptd_hash_finup);
 528 }
 529
 530 static void cryptd_hash_digest(struct crypto_async_request *req_async, int err)
 531 {
 532         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 533         struct crypto_shash *child = ctx->child;
 534         struct ahash_request *req = ahash_request_cast(req_async);
 535         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 536         struct shash_desc *desc = &rctx->desc;
 537
 538         if (unlikely(err == -EINPROGRESS))
 539                 goto out;
 540
 541         desc->tfm = child;
 542         desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 543
 544         err = shash_ahash_digest(req, desc);
 545
 546         req->base.complete = rctx->complete;
 547
 548 out:
 549         local_bh_disable();
 550         rctx->complete(&req->base, err);
 551         local_bh_enable();
 552 }
 553
 554 static int cryptd_hash_digest_enqueue(struct ahash_request *req)
 555 {
 556         return cryptd_hash_enqueue(req, cryptd_hash_digest);
 557 }
 558
 559 static int cryptd_hash_export(struct ahash_request *req, void *out)
 560 {
 561         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 562
 563         return crypto_shash_export(&rctx->desc, out);
 564 }
 565
 566 static int cryptd_hash_import(struct ahash_request *req, const void *in)
 567 {
 568         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 569         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 570         struct shash_desc *desc = cryptd_shash_desc(req);
 571
 572         desc->tfm = ctx->child;
 573         desc->flags = req->base.flags;
 574
 575         return crypto_shash_import(desc, in);
 576 }
 577
 578 static int cryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
 579                               struct cryptd_queue *queue)
 580 {
 581         struct hashd_instance_ctx *ctx;
 582         struct ahash_instance *inst;
 583         struct shash_alg *salg;
 584         struct crypto_alg *alg;
 585         int err;
 586
 587         salg = shash_attr_alg(tb[1], 0, 0);
 588         if (IS_ERR(salg))
 589                 return PTR_ERR(salg);
 590
 591         alg = &salg->base;
 592         inst = cryptd_alloc_instance(alg, ahash_instance_headroom(),
 593                                      sizeof(*ctx));
 594         err = PTR_ERR(inst);
 595         if (IS_ERR(inst))
 596                 goto out_put_alg;
 597
 598         ctx = ahash_instance_ctx(inst);
 599         ctx->queue = queue;
 600
 601         err = crypto_init_shash_spawn(&ctx->spawn, salg,
 602                                       ahash_crypto_instance(inst));
 603         if (err)
 604                 goto out_free_inst;
 605
 606         inst->alg.halg.base.cra_flags = CRYPTO_ALG_ASYNC;
 607
 608         inst->alg.halg.digestsize = salg->digestsize;
 609         inst->alg.halg.statesize = salg->statesize;
 610         inst->alg.halg.base.cra_ctxsize = sizeof(struct cryptd_hash_ctx);
 611
 612         inst->alg.halg.base.cra_init = cryptd_hash_init_tfm;
 613         inst->alg.halg.base.cra_exit = cryptd_hash_exit_tfm;
 614
 615         inst->alg.init   = cryptd_hash_init_enqueue;
 616         inst->alg.update = cryptd_hash_update_enqueue;
 617         inst->alg.final  = cryptd_hash_final_enqueue;
 618         inst->alg.finup  = cryptd_hash_finup_enqueue;
 619         inst->alg.export = cryptd_hash_export;
 620         inst->alg.import = cryptd_hash_import;
 621         inst->alg.setkey = cryptd_hash_setkey;
 622         inst->alg.digest = cryptd_hash_digest_enqueue;
 623
 624         err = ahash_register_instance(tmpl, inst);
 625         if (err) {
 626                 crypto_drop_shash(&ctx->spawn);
 627 out_free_inst:
 628                 kfree(inst);
 629         }
 630
 631 out_put_alg:
 632         crypto_mod_put(alg);
 633         return err;
 634 }
 635
 636 static void cryptd_aead_crypt(struct aead_request *req,
 637                         struct crypto_aead *child,
 638                         int err,
 639                         int (*crypt)(struct aead_request *req))
 640 {
 641         struct cryptd_aead_request_ctx *rctx;
 642         rctx = aead_request_ctx(req);
 643
 644         if (unlikely(err == -EINPROGRESS))
 645                 goto out;
 646         aead_request_set_tfm(req, child);
 647         err = crypt( req );
 648         req->base.complete = rctx->complete;
 649 out:
 650         local_bh_disable();
 651         rctx->complete(&req->base, err);
 652         local_bh_enable();
 653 }
 654
 655 static void cryptd_aead_encrypt(struct crypto_async_request *areq, int err)
 656 {
 657         struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
 658         struct crypto_aead *child = ctx->child;
 659         struct aead_request *req;
 660
 661         req = container_of(areq, struct aead_request, base);
 662         cryptd_aead_crypt(req, child, err, crypto_aead_crt(child)->encrypt);
 663 }
 664
 665 static void cryptd_aead_decrypt(struct crypto_async_request *areq, int err)
 666 {
 667         struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
 668         struct crypto_aead *child = ctx->child;
 669         struct aead_request *req;
 670
 671         req = container_of(areq, struct aead_request, base);
 672         cryptd_aead_crypt(req, child, err, crypto_aead_crt(child)->decrypt);
 673 }
 674
 675 static int cryptd_aead_enqueue(struct aead_request *req,
 676                                     crypto_completion_t complete)
 677 {
 678         struct cryptd_aead_request_ctx *rctx = aead_request_ctx(req);
 679         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 680         struct cryptd_queue *queue = cryptd_get_queue(crypto_aead_tfm(tfm));
 681
 682         rctx->complete = req->base.complete;
 683         req->base.complete = complete;
 684         return cryptd_enqueue_request(queue, &req->base);
 685 }
 686
 687 static int cryptd_aead_encrypt_enqueue(struct aead_request *req)
 688 {
 689         return cryptd_aead_enqueue(req, cryptd_aead_encrypt );
 690 }
 691
 692 static int cryptd_aead_decrypt_enqueue(struct aead_request *req)
 693 {
 694         return cryptd_aead_enqueue(req, cryptd_aead_decrypt );
 695 }
 696
 697 static int cryptd_aead_init_tfm(struct crypto_tfm *tfm)
 698 {
 699         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 700         struct aead_instance_ctx *ictx = crypto_instance_ctx(inst);
 701         struct crypto_aead_spawn *spawn = &ictx->aead_spawn;
 702         struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(tfm);
 703         struct crypto_aead *cipher;
 704
 705         cipher = crypto_spawn_aead(spawn);
 706         if (IS_ERR(cipher))
 707                 return PTR_ERR(cipher);
 708
 709         crypto_aead_set_flags(cipher, CRYPTO_TFM_REQ_MAY_SLEEP);
 710         ctx->child = cipher;
 711         tfm->crt_aead.reqsize = sizeof(struct cryptd_aead_request_ctx);
 712         return 0;
 713 }
 714
 715 static void cryptd_aead_exit_tfm(struct crypto_tfm *tfm)
 716 {
 717         struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(tfm);
 718         crypto_free_aead(ctx->child);
 719 }
 720
 721 static int cryptd_create_aead(struct crypto_template *tmpl,
 722                               struct rtattr **tb,
 723                               struct cryptd_queue *queue)
 724 {
 725         struct aead_instance_ctx *ctx;
 726         struct crypto_instance *inst;
 727         struct crypto_alg *alg;
 728         int err;
 729
 730         alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_AEAD,
 731                                 CRYPTO_ALG_TYPE_MASK);
 732         if (IS_ERR(alg))
 733                 return PTR_ERR(alg);
 734
 735         inst = cryptd_alloc_instance(alg, 0, sizeof(*ctx));
 736         err = PTR_ERR(inst);
 737         if (IS_ERR(inst))
 738                 goto out_put_alg;
 739
 740         ctx = crypto_instance_ctx(inst);
 741         ctx->queue = queue;
 742
 743         err = crypto_init_spawn(&ctx->aead_spawn.base, alg, inst,
 744                         CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 745         if (err)
 746                 goto out_free_inst;
 747
 748         inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC;
 749         inst->alg.cra_type = alg->cra_type;
 750         inst->alg.cra_ctxsize = sizeof(struct cryptd_aead_ctx);
 751         inst->alg.cra_init = cryptd_aead_init_tfm;
 752         inst->alg.cra_exit = cryptd_aead_exit_tfm;
 753         inst->alg.cra_aead.setkey      = alg->cra_aead.setkey;
 754         inst->alg.cra_aead.setauthsize = alg->cra_aead.setauthsize;
 755         inst->alg.cra_aead.geniv       = alg->cra_aead.geniv;
 756         inst->alg.cra_aead.ivsize      = alg->cra_aead.ivsize;
 757         inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;
 758         inst->alg.cra_aead.encrypt     = cryptd_aead_encrypt_enqueue;
 759         inst->alg.cra_aead.decrypt     = cryptd_aead_decrypt_enqueue;
 760         inst->alg.cra_aead.givencrypt  = alg->cra_aead.givencrypt;
 761         inst->alg.cra_aead.givdecrypt  = alg->cra_aead.givdecrypt;
 762
 763         err = crypto_register_instance(tmpl, inst);
 764         if (err) {
 765                 crypto_drop_spawn(&ctx->aead_spawn.base);
 766 out_free_inst:
 767                 kfree(inst);
 768         }
 769 out_put_alg:
 770         crypto_mod_put(alg);
 771         return err;
 772 }
 773
 774 static struct cryptd_queue queue;
 775
 776 static int cryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
 777 {
 778         struct crypto_attr_type *algt;
 779
 780         algt = crypto_get_attr_type(tb);
 781         if (IS_ERR(algt))
 782                 return PTR_ERR(algt);
 783
 784         switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
 785         case CRYPTO_ALG_TYPE_BLKCIPHER:
 786                 return cryptd_create_blkcipher(tmpl, tb, &queue);
 787         case CRYPTO_ALG_TYPE_DIGEST:
 788                 return cryptd_create_hash(tmpl, tb, &queue);
 789         case CRYPTO_ALG_TYPE_AEAD:
 790                 return cryptd_create_aead(tmpl, tb, &queue);
 791         }
 792
 793         return -EINVAL;
 794 }
 795
 796 static void cryptd_free(struct crypto_instance *inst)
 797 {
 798         struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
 799         struct hashd_instance_ctx *hctx = crypto_instance_ctx(inst);
 800         struct aead_instance_ctx *aead_ctx = crypto_instance_ctx(inst);
 801
 802         switch (inst->alg.cra_flags & CRYPTO_ALG_TYPE_MASK) {
 803         case CRYPTO_ALG_TYPE_AHASH:
 804                 crypto_drop_shash(&hctx->spawn);
 805                 kfree(ahash_instance(inst));
 806                 return;
 807         case CRYPTO_ALG_TYPE_AEAD:
 808                 crypto_drop_spawn(&aead_ctx->aead_spawn.base);
 809                 kfree(inst);
 810                 return;
 811         default:
 812                 crypto_drop_spawn(&ctx->spawn);
 813                 kfree(inst);
 814         }
 815 }
 816
 817 static struct crypto_template cryptd_tmpl = {
 818         .name = "cryptd",
 819         .create = cryptd_create,
 820         .free = cryptd_free,
 821         .module = THIS_MODULE,
 822 };
 823
 824 struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name,
 825                                                   u32 type, u32 mask)
 826 {
 827         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 828         struct crypto_tfm *tfm;
 829
 830         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 831                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 832                 return ERR_PTR(-EINVAL);
 833         type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
 834         type |= CRYPTO_ALG_TYPE_BLKCIPHER;
 835         mask &= ~CRYPTO_ALG_TYPE_MASK;
 836         mask |= (CRYPTO_ALG_GENIV | CRYPTO_ALG_TYPE_BLKCIPHER_MASK);
 837         tfm = crypto_alloc_base(cryptd_alg_name, type, mask);
 838         if (IS_ERR(tfm))
 839                 return ERR_CAST(tfm);
 840         if (tfm->__crt_alg->cra_module != THIS_MODULE) {
 841                 crypto_free_tfm(tfm);
 842                 return ERR_PTR(-EINVAL);
 843         }
 844
 845         return __cryptd_ablkcipher_cast(__crypto_ablkcipher_cast(tfm));
 846 }
 847 EXPORT_SYMBOL_GPL(cryptd_alloc_ablkcipher);
 848
 849 struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm)
 850 {
 851         struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base);
 852         return ctx->child;
 853 }
 854 EXPORT_SYMBOL_GPL(cryptd_ablkcipher_child);
 855
 856 void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm)
 857 {
 858         crypto_free_ablkcipher(&tfm->base);
 859 }
 860 EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher);
 861
 862 struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name,
 863                                         u32 type, u32 mask)
 864 {
 865         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 866         struct crypto_ahash *tfm;
 867
 868         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 869                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 870                 return ERR_PTR(-EINVAL);
 871         tfm = crypto_alloc_ahash(cryptd_alg_name, type, mask);
 872         if (IS_ERR(tfm))
 873                 return ERR_CAST(tfm);
 874         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 875                 crypto_free_ahash(tfm);
 876                 return ERR_PTR(-EINVAL);
 877         }
 878
 879         return __cryptd_ahash_cast(tfm);
 880 }
 881 EXPORT_SYMBOL_GPL(cryptd_alloc_ahash);
 882
 883 struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm)
 884 {
 885         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
 886
 887         return ctx->child;
 888 }
 889 EXPORT_SYMBOL_GPL(cryptd_ahash_child);
 890
 891 struct shash_desc *cryptd_shash_desc(struct ahash_request *req)
 892 {
 893         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 894         return &rctx->desc;
 895 }
 896 EXPORT_SYMBOL_GPL(cryptd_shash_desc);
 897
 898 void cryptd_free_ahash(struct cryptd_ahash *tfm)
 899 {
 900         crypto_free_ahash(&tfm->base);
 901 }
 902 EXPORT_SYMBOL_GPL(cryptd_free_ahash);
 903
 904 struct cryptd_aead *cryptd_alloc_aead(const char *alg_name,
 905                                                   u32 type, u32 mask)
 906 {
 907         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 908         struct crypto_aead *tfm;
 909
 910         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 911                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 912                 return ERR_PTR(-EINVAL);
 913         tfm = crypto_alloc_aead(cryptd_alg_name, type, mask);
 914         if (IS_ERR(tfm))
 915                 return ERR_CAST(tfm);
 916         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 917                 crypto_free_aead(tfm);
 918                 return ERR_PTR(-EINVAL);
 919         }
 920         return __cryptd_aead_cast(tfm);
 921 }
 922 EXPORT_SYMBOL_GPL(cryptd_alloc_aead);
 923
 924 struct crypto_aead *cryptd_aead_child(struct cryptd_aead *tfm)
 925 {
 926         struct cryptd_aead_ctx *ctx;
 927         ctx = crypto_aead_ctx(&tfm->base);
 928         return ctx->child;
 929 }
 930 EXPORT_SYMBOL_GPL(cryptd_aead_child);
 931
 932 void cryptd_free_aead(struct cryptd_aead *tfm)
 933 {
 934         crypto_free_aead(&tfm->base);
 935 }
 936 EXPORT_SYMBOL_GPL(cryptd_free_aead);
 937
 938 static int __init cryptd_init(void)
 939 {
 940         int err;
 941
 942         err = cryptd_init_queue(&queue, CRYPTD_MAX_CPU_QLEN);
 943         if (err)
 944                 return err;
 945
 946         err = crypto_register_template(&cryptd_tmpl);
 947         if (err)
 948                 cryptd_fini_queue(&queue);
 949
 950         return err;
 951 }
 952
 953 static void __exit cryptd_exit(void)
 954 {
 955         cryptd_fini_queue(&queue);
 956         crypto_unregister_template(&cryptd_tmpl);
 957 }
 958
 959 subsys_initcall(cryptd_init);
 960 module_exit(cryptd_exit);
 961
 962 MODULE_LICENSE("GPL");
 963 MODULE_DESCRIPTION("Software async crypto daemon");
 964 MODULE_ALIAS_CRYPTO("cryptd");