crypto/mcryptd.c

   1 /*
   2  * Software multibuffer async crypto daemon.
   3  *
   4  * Copyright (c) 2014 Tim Chen <tim.c.chen@linux.intel.com>
   5  *
   6  * Adapted from crypto daemon.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the Free
  10  * Software Foundation; either version 2 of the License, or (at your option)
  11  * any later version.
  12  *
  13  */
  14
  15 #include <crypto/algapi.h>
  16 #include <crypto/internal/hash.h>
  17 #include <crypto/internal/aead.h>
  18 #include <crypto/mcryptd.h>
  19 #include <crypto/crypto_wq.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/hardirq.h>
  29
  30 #define MCRYPTD_MAX_CPU_QLEN 100
  31 #define MCRYPTD_BATCH 9
  32
  33 static void *mcryptd_alloc_instance(struct crypto_alg *alg, unsigned int head,
  34                                    unsigned int tail);
  35
  36 struct mcryptd_flush_list {
  37         struct list_head list;
  38         struct mutex lock;
  39 };
  40
  41 static struct mcryptd_flush_list __percpu *mcryptd_flist;
  42
  43 struct hashd_instance_ctx {
  44         struct crypto_shash_spawn spawn;
  45         struct mcryptd_queue *queue;
  46 };
  47
  48 static void mcryptd_queue_worker(struct work_struct *work);
  49
  50 void mcryptd_arm_flusher(struct mcryptd_alg_cstate *cstate, unsigned long delay)
  51 {
  52         struct mcryptd_flush_list *flist;
  53
  54         if (!cstate->flusher_engaged) {
  55                 /* put the flusher on the flush list */
  56                 flist = per_cpu_ptr(mcryptd_flist, smp_processor_id());
  57                 mutex_lock(&flist->lock);
  58                 list_add_tail(&cstate->flush_list, &flist->list);
  59                 cstate->flusher_engaged = true;
  60                 cstate->next_flush = jiffies + delay;
  61                 queue_delayed_work_on(smp_processor_id(), kcrypto_wq,
  62                         &cstate->flush, delay);
  63                 mutex_unlock(&flist->lock);
  64         }
  65 }
  66 EXPORT_SYMBOL(mcryptd_arm_flusher);
  67
  68 static int mcryptd_init_queue(struct mcryptd_queue *queue,
  69                              unsigned int max_cpu_qlen)
  70 {
  71         int cpu;
  72         struct mcryptd_cpu_queue *cpu_queue;
  73
  74         queue->cpu_queue = alloc_percpu(struct mcryptd_cpu_queue);
  75         pr_debug("mqueue:%p mcryptd_cpu_queue %p\n", queue, queue->cpu_queue);
  76         if (!queue->cpu_queue)
  77                 return -ENOMEM;
  78         for_each_possible_cpu(cpu) {
  79                 cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
  80                 pr_debug("cpu_queue #%d %p\n", cpu, queue->cpu_queue);
  81                 crypto_init_queue(&cpu_queue->queue, max_cpu_qlen);
  82                 INIT_WORK(&cpu_queue->work, mcryptd_queue_worker);
  83         }
  84         return 0;
  85 }
  86
  87 static void mcryptd_fini_queue(struct mcryptd_queue *queue)
  88 {
  89         int cpu;
  90         struct mcryptd_cpu_queue *cpu_queue;
  91
  92         for_each_possible_cpu(cpu) {
  93                 cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
  94                 BUG_ON(cpu_queue->queue.qlen);
  95         }
  96         free_percpu(queue->cpu_queue);
  97 }
  98
  99 static int mcryptd_enqueue_request(struct mcryptd_queue *queue,
 100                                   struct crypto_async_request *request,
 101                                   struct mcryptd_hash_request_ctx *rctx)
 102 {
 103         int cpu, err;
 104         struct mcryptd_cpu_queue *cpu_queue;
 105
 106         cpu = get_cpu();
 107         cpu_queue = this_cpu_ptr(queue->cpu_queue);
 108         rctx->tag.cpu = cpu;
 109
 110         err = crypto_enqueue_request(&cpu_queue->queue, request);
 111         pr_debug("enqueue request: cpu %d cpu_queue %p request %p\n",
 112                  cpu, cpu_queue, request);
 113         queue_work_on(cpu, kcrypto_wq, &cpu_queue->work);
 114         put_cpu();
 115
 116         return err;
 117 }
 118
 119 /*
 120  * Try to opportunisticlly flush the partially completed jobs if
 121  * crypto daemon is the only task running.
 122  */
 123 static void mcryptd_opportunistic_flush(void)
 124 {
 125         struct mcryptd_flush_list *flist;
 126         struct mcryptd_alg_cstate *cstate;
 127
 128         flist = per_cpu_ptr(mcryptd_flist, smp_processor_id());
 129         while (single_task_running()) {
 130                 mutex_lock(&flist->lock);
 131                 if (list_empty(&flist->list)) {
 132                         mutex_unlock(&flist->lock);
 133                         return;
 134                 }
 135                 cstate = list_entry(flist->list.next,
 136                                 struct mcryptd_alg_cstate, flush_list);
 137                 if (!cstate->flusher_engaged) {
 138                         mutex_unlock(&flist->lock);
 139                         return;
 140                 }
 141                 list_del(&cstate->flush_list);
 142                 cstate->flusher_engaged = false;
 143                 mutex_unlock(&flist->lock);
 144                 cstate->alg_state->flusher(cstate);
 145         }
 146 }
 147
 148 /*
 149  * Called in workqueue context, do one real cryption work (via
 150  * req->complete) and reschedule itself if there are more work to
 151  * do.
 152  */
 153 static void mcryptd_queue_worker(struct work_struct *work)
 154 {
 155         struct mcryptd_cpu_queue *cpu_queue;
 156         struct crypto_async_request *req, *backlog;
 157         int i;
 158
 159         /*
 160          * Need to loop through more than once for multi-buffer to
 161          * be effective.
 162          */
 163
 164         cpu_queue = container_of(work, struct mcryptd_cpu_queue, work);
 165         i = 0;
 166         while (i < MCRYPTD_BATCH || single_task_running()) {
 167                 /*
 168                  * preempt_disable/enable is used to prevent
 169                  * being preempted by mcryptd_enqueue_request()
 170                  */
 171                 local_bh_disable();
 172                 preempt_disable();
 173                 backlog = crypto_get_backlog(&cpu_queue->queue);
 174                 req = crypto_dequeue_request(&cpu_queue->queue);
 175                 preempt_enable();
 176                 local_bh_enable();
 177
 178                 if (!req) {
 179                         mcryptd_opportunistic_flush();
 180                         return;
 181                 }
 182
 183                 if (backlog)
 184                         backlog->complete(backlog, -EINPROGRESS);
 185                 req->complete(req, 0);
 186                 if (!cpu_queue->queue.qlen)
 187                         return;
 188                 ++i;
 189         }
 190         if (cpu_queue->queue.qlen)
 191                 queue_work(kcrypto_wq, &cpu_queue->work);
 192 }
 193
 194 void mcryptd_flusher(struct work_struct *__work)
 195 {
 196         struct  mcryptd_alg_cstate      *alg_cpu_state;
 197         struct  mcryptd_alg_state       *alg_state;
 198         struct  mcryptd_flush_list      *flist;
 199         int     cpu;
 200
 201         cpu = smp_processor_id();
 202         alg_cpu_state = container_of(to_delayed_work(__work),
 203                                      struct mcryptd_alg_cstate, flush);
 204         alg_state = alg_cpu_state->alg_state;
 205         if (alg_cpu_state->cpu != cpu)
 206                 pr_debug("mcryptd error: work on cpu %d, should be cpu %d\n",
 207                                 cpu, alg_cpu_state->cpu);
 208
 209         if (alg_cpu_state->flusher_engaged) {
 210                 flist = per_cpu_ptr(mcryptd_flist, cpu);
 211                 mutex_lock(&flist->lock);
 212                 list_del(&alg_cpu_state->flush_list);
 213                 alg_cpu_state->flusher_engaged = false;
 214                 mutex_unlock(&flist->lock);
 215                 alg_state->flusher(alg_cpu_state);
 216         }
 217 }
 218 EXPORT_SYMBOL_GPL(mcryptd_flusher);
 219
 220 static inline struct mcryptd_queue *mcryptd_get_queue(struct crypto_tfm *tfm)
 221 {
 222         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 223         struct mcryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
 224
 225         return ictx->queue;
 226 }
 227
 228 static void *mcryptd_alloc_instance(struct crypto_alg *alg, unsigned int head,
 229                                    unsigned int tail)
 230 {
 231         char *p;
 232         struct crypto_instance *inst;
 233         int err;
 234
 235         p = kzalloc(head + sizeof(*inst) + tail, GFP_KERNEL);
 236         if (!p)
 237                 return ERR_PTR(-ENOMEM);
 238
 239         inst = (void *)(p + head);
 240
 241         err = -ENAMETOOLONG;
 242         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 243                     "mcryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 244                 goto out_free_inst;
 245
 246         memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
 247
 248         inst->alg.cra_priority = alg->cra_priority + 50;
 249         inst->alg.cra_blocksize = alg->cra_blocksize;
 250         inst->alg.cra_alignmask = alg->cra_alignmask;
 251
 252 out:
 253         return p;
 254
 255 out_free_inst:
 256         kfree(p);
 257         p = ERR_PTR(err);
 258         goto out;
 259 }
 260
 261 static int mcryptd_hash_init_tfm(struct crypto_tfm *tfm)
 262 {
 263         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 264         struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst);
 265         struct crypto_shash_spawn *spawn = &ictx->spawn;
 266         struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 267         struct crypto_shash *hash;
 268
 269         hash = crypto_spawn_shash(spawn);
 270         if (IS_ERR(hash))
 271                 return PTR_ERR(hash);
 272
 273         ctx->child = hash;
 274         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 275                                  sizeof(struct mcryptd_hash_request_ctx) +
 276                                  crypto_shash_descsize(hash));
 277         return 0;
 278 }
 279
 280 static void mcryptd_hash_exit_tfm(struct crypto_tfm *tfm)
 281 {
 282         struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 283
 284         crypto_free_shash(ctx->child);
 285 }
 286
 287 static int mcryptd_hash_setkey(struct crypto_ahash *parent,
 288                                    const u8 *key, unsigned int keylen)
 289 {
 290         struct mcryptd_hash_ctx *ctx   = crypto_ahash_ctx(parent);
 291         struct crypto_shash *child = ctx->child;
 292         int err;
 293
 294         crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 295         crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) &
 296                                       CRYPTO_TFM_REQ_MASK);
 297         err = crypto_shash_setkey(child, key, keylen);
 298         crypto_ahash_set_flags(parent, crypto_shash_get_flags(child) &
 299                                        CRYPTO_TFM_RES_MASK);
 300         return err;
 301 }
 302
 303 static int mcryptd_hash_enqueue(struct ahash_request *req,
 304                                 crypto_completion_t complete)
 305 {
 306         int ret;
 307
 308         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 309         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 310         struct mcryptd_queue *queue =
 311                 mcryptd_get_queue(crypto_ahash_tfm(tfm));
 312
 313         rctx->complete = req->base.complete;
 314         req->base.complete = complete;
 315
 316         ret = mcryptd_enqueue_request(queue, &req->base, rctx);
 317
 318         return ret;
 319 }
 320
 321 static void mcryptd_hash_init(struct crypto_async_request *req_async, int err)
 322 {
 323         struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 324         struct crypto_shash *child = ctx->child;
 325         struct ahash_request *req = ahash_request_cast(req_async);
 326         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 327         struct shash_desc *desc = &rctx->desc;
 328
 329         if (unlikely(err == -EINPROGRESS))
 330                 goto out;
 331
 332         desc->tfm = child;
 333         desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 334
 335         err = crypto_shash_init(desc);
 336
 337         req->base.complete = rctx->complete;
 338
 339 out:
 340         local_bh_disable();
 341         rctx->complete(&req->base, err);
 342         local_bh_enable();
 343 }
 344
 345 static int mcryptd_hash_init_enqueue(struct ahash_request *req)
 346 {
 347         return mcryptd_hash_enqueue(req, mcryptd_hash_init);
 348 }
 349
 350 static void mcryptd_hash_update(struct crypto_async_request *req_async, int err)
 351 {
 352         struct ahash_request *req = ahash_request_cast(req_async);
 353         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 354
 355         if (unlikely(err == -EINPROGRESS))
 356                 goto out;
 357
 358         err = shash_ahash_mcryptd_update(req, &rctx->desc);
 359         if (err) {
 360                 req->base.complete = rctx->complete;
 361                 goto out;
 362         }
 363
 364         return;
 365 out:
 366         local_bh_disable();
 367         rctx->complete(&req->base, err);
 368         local_bh_enable();
 369 }
 370
 371 static int mcryptd_hash_update_enqueue(struct ahash_request *req)
 372 {
 373         return mcryptd_hash_enqueue(req, mcryptd_hash_update);
 374 }
 375
 376 static void mcryptd_hash_final(struct crypto_async_request *req_async, int err)
 377 {
 378         struct ahash_request *req = ahash_request_cast(req_async);
 379         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 380
 381         if (unlikely(err == -EINPROGRESS))
 382                 goto out;
 383
 384         err = shash_ahash_mcryptd_final(req, &rctx->desc);
 385         if (err) {
 386                 req->base.complete = rctx->complete;
 387                 goto out;
 388         }
 389
 390         return;
 391 out:
 392         local_bh_disable();
 393         rctx->complete(&req->base, err);
 394         local_bh_enable();
 395 }
 396
 397 static int mcryptd_hash_final_enqueue(struct ahash_request *req)
 398 {
 399         return mcryptd_hash_enqueue(req, mcryptd_hash_final);
 400 }
 401
 402 static void mcryptd_hash_finup(struct crypto_async_request *req_async, int err)
 403 {
 404         struct ahash_request *req = ahash_request_cast(req_async);
 405         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 406
 407         if (unlikely(err == -EINPROGRESS))
 408                 goto out;
 409
 410         err = shash_ahash_mcryptd_finup(req, &rctx->desc);
 411
 412         if (err) {
 413                 req->base.complete = rctx->complete;
 414                 goto out;
 415         }
 416
 417         return;
 418 out:
 419         local_bh_disable();
 420         rctx->complete(&req->base, err);
 421         local_bh_enable();
 422 }
 423
 424 static int mcryptd_hash_finup_enqueue(struct ahash_request *req)
 425 {
 426         return mcryptd_hash_enqueue(req, mcryptd_hash_finup);
 427 }
 428
 429 static void mcryptd_hash_digest(struct crypto_async_request *req_async, int err)
 430 {
 431         struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 432         struct crypto_shash *child = ctx->child;
 433         struct ahash_request *req = ahash_request_cast(req_async);
 434         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 435         struct shash_desc *desc = &rctx->desc;
 436
 437         if (unlikely(err == -EINPROGRESS))
 438                 goto out;
 439
 440         desc->tfm = child;
 441         desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;  /* check this again */
 442
 443         err = shash_ahash_mcryptd_digest(req, desc);
 444
 445         if (err) {
 446                 req->base.complete = rctx->complete;
 447                 goto out;
 448         }
 449
 450         return;
 451 out:
 452         local_bh_disable();
 453         rctx->complete(&req->base, err);
 454         local_bh_enable();
 455 }
 456
 457 static int mcryptd_hash_digest_enqueue(struct ahash_request *req)
 458 {
 459         return mcryptd_hash_enqueue(req, mcryptd_hash_digest);
 460 }
 461
 462 static int mcryptd_hash_export(struct ahash_request *req, void *out)
 463 {
 464         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 465
 466         return crypto_shash_export(&rctx->desc, out);
 467 }
 468
 469 static int mcryptd_hash_import(struct ahash_request *req, const void *in)
 470 {
 471         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 472
 473         return crypto_shash_import(&rctx->desc, in);
 474 }
 475
 476 static int mcryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
 477                               struct mcryptd_queue *queue)
 478 {
 479         struct hashd_instance_ctx *ctx;
 480         struct ahash_instance *inst;
 481         struct shash_alg *salg;
 482         struct crypto_alg *alg;
 483         int err;
 484
 485         salg = shash_attr_alg(tb[1], 0, 0);
 486         if (IS_ERR(salg))
 487                 return PTR_ERR(salg);
 488
 489         alg = &salg->base;
 490         pr_debug("crypto: mcryptd hash alg: %s\n", alg->cra_name);
 491         inst = mcryptd_alloc_instance(alg, ahash_instance_headroom(),
 492                                         sizeof(*ctx));
 493         err = PTR_ERR(inst);
 494         if (IS_ERR(inst))
 495                 goto out_put_alg;
 496
 497         ctx = ahash_instance_ctx(inst);
 498         ctx->queue = queue;
 499
 500         err = crypto_init_shash_spawn(&ctx->spawn, salg,
 501                                       ahash_crypto_instance(inst));
 502         if (err)
 503                 goto out_free_inst;
 504
 505         inst->alg.halg.base.cra_flags = CRYPTO_ALG_ASYNC;
 506
 507         inst->alg.halg.digestsize = salg->digestsize;
 508         inst->alg.halg.base.cra_ctxsize = sizeof(struct mcryptd_hash_ctx);
 509
 510         inst->alg.halg.base.cra_init = mcryptd_hash_init_tfm;
 511         inst->alg.halg.base.cra_exit = mcryptd_hash_exit_tfm;
 512
 513         inst->alg.init   = mcryptd_hash_init_enqueue;
 514         inst->alg.update = mcryptd_hash_update_enqueue;
 515         inst->alg.final  = mcryptd_hash_final_enqueue;
 516         inst->alg.finup  = mcryptd_hash_finup_enqueue;
 517         inst->alg.export = mcryptd_hash_export;
 518         inst->alg.import = mcryptd_hash_import;
 519         inst->alg.setkey = mcryptd_hash_setkey;
 520         inst->alg.digest = mcryptd_hash_digest_enqueue;
 521
 522         err = ahash_register_instance(tmpl, inst);
 523         if (err) {
 524                 crypto_drop_shash(&ctx->spawn);
 525 out_free_inst:
 526                 kfree(inst);
 527         }
 528
 529 out_put_alg:
 530         crypto_mod_put(alg);
 531         return err;
 532 }
 533
 534 static struct mcryptd_queue mqueue;
 535
 536 static int mcryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
 537 {
 538         struct crypto_attr_type *algt;
 539
 540         algt = crypto_get_attr_type(tb);
 541         if (IS_ERR(algt))
 542                 return PTR_ERR(algt);
 543
 544         switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
 545         case CRYPTO_ALG_TYPE_DIGEST:
 546                 return mcryptd_create_hash(tmpl, tb, &mqueue);
 547         break;
 548         }
 549
 550         return -EINVAL;
 551 }
 552
 553 static void mcryptd_free(struct crypto_instance *inst)
 554 {
 555         struct mcryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
 556         struct hashd_instance_ctx *hctx = crypto_instance_ctx(inst);
 557
 558         switch (inst->alg.cra_flags & CRYPTO_ALG_TYPE_MASK) {
 559         case CRYPTO_ALG_TYPE_AHASH:
 560                 crypto_drop_shash(&hctx->spawn);
 561                 kfree(ahash_instance(inst));
 562                 return;
 563         default:
 564                 crypto_drop_spawn(&ctx->spawn);
 565                 kfree(inst);
 566         }
 567 }
 568
 569 static struct crypto_template mcryptd_tmpl = {
 570         .name = "mcryptd",
 571         .create = mcryptd_create,
 572         .free = mcryptd_free,
 573         .module = THIS_MODULE,
 574 };
 575
 576 struct mcryptd_ahash *mcryptd_alloc_ahash(const char *alg_name,
 577                                         u32 type, u32 mask)
 578 {
 579         char mcryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 580         struct crypto_ahash *tfm;
 581
 582         if (snprintf(mcryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 583                      "mcryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 584                 return ERR_PTR(-EINVAL);
 585         tfm = crypto_alloc_ahash(mcryptd_alg_name, type, mask);
 586         if (IS_ERR(tfm))
 587                 return ERR_CAST(tfm);
 588         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 589                 crypto_free_ahash(tfm);
 590                 return ERR_PTR(-EINVAL);
 591         }
 592
 593         return __mcryptd_ahash_cast(tfm);
 594 }
 595 EXPORT_SYMBOL_GPL(mcryptd_alloc_ahash);
 596
 597 int shash_ahash_mcryptd_digest(struct ahash_request *req,
 598                                struct shash_desc *desc)
 599 {
 600         int err;
 601
 602         err = crypto_shash_init(desc) ?:
 603               shash_ahash_mcryptd_finup(req, desc);
 604
 605         return err;
 606 }
 607 EXPORT_SYMBOL_GPL(shash_ahash_mcryptd_digest);
 608
 609 int shash_ahash_mcryptd_update(struct ahash_request *req,
 610                                struct shash_desc *desc)
 611 {
 612         struct crypto_shash *tfm = desc->tfm;
 613         struct shash_alg *shash = crypto_shash_alg(tfm);
 614
 615         /* alignment is to be done by multi-buffer crypto algorithm if needed */
 616
 617         return shash->update(desc, NULL, 0);
 618 }
 619 EXPORT_SYMBOL_GPL(shash_ahash_mcryptd_update);
 620
 621 int shash_ahash_mcryptd_finup(struct ahash_request *req,
 622                               struct shash_desc *desc)
 623 {
 624         struct crypto_shash *tfm = desc->tfm;
 625         struct shash_alg *shash = crypto_shash_alg(tfm);
 626
 627         /* alignment is to be done by multi-buffer crypto algorithm if needed */
 628
 629         return shash->finup(desc, NULL, 0, req->result);
 630 }
 631 EXPORT_SYMBOL_GPL(shash_ahash_mcryptd_finup);
 632
 633 int shash_ahash_mcryptd_final(struct ahash_request *req,
 634                               struct shash_desc *desc)
 635 {
 636         struct crypto_shash *tfm = desc->tfm;
 637         struct shash_alg *shash = crypto_shash_alg(tfm);
 638
 639         /* alignment is to be done by multi-buffer crypto algorithm if needed */
 640
 641         return shash->final(desc, req->result);
 642 }
 643 EXPORT_SYMBOL_GPL(shash_ahash_mcryptd_final);
 644
 645 struct crypto_shash *mcryptd_ahash_child(struct mcryptd_ahash *tfm)
 646 {
 647         struct mcryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
 648
 649         return ctx->child;
 650 }
 651 EXPORT_SYMBOL_GPL(mcryptd_ahash_child);
 652
 653 struct shash_desc *mcryptd_shash_desc(struct ahash_request *req)
 654 {
 655         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 656         return &rctx->desc;
 657 }
 658 EXPORT_SYMBOL_GPL(mcryptd_shash_desc);
 659
 660 void mcryptd_free_ahash(struct mcryptd_ahash *tfm)
 661 {
 662         crypto_free_ahash(&tfm->base);
 663 }
 664 EXPORT_SYMBOL_GPL(mcryptd_free_ahash);
 665
 666
 667 static int __init mcryptd_init(void)
 668 {
 669         int err, cpu;
 670         struct mcryptd_flush_list *flist;
 671
 672         mcryptd_flist = alloc_percpu(struct mcryptd_flush_list);
 673         for_each_possible_cpu(cpu) {
 674                 flist = per_cpu_ptr(mcryptd_flist, cpu);
 675                 INIT_LIST_HEAD(&flist->list);
 676                 mutex_init(&flist->lock);
 677         }
 678
 679         err = mcryptd_init_queue(&mqueue, MCRYPTD_MAX_CPU_QLEN);
 680         if (err) {
 681                 free_percpu(mcryptd_flist);
 682                 return err;
 683         }
 684
 685         err = crypto_register_template(&mcryptd_tmpl);
 686         if (err) {
 687                 mcryptd_fini_queue(&mqueue);
 688                 free_percpu(mcryptd_flist);
 689         }
 690
 691         return err;
 692 }
 693
 694 static void __exit mcryptd_exit(void)
 695 {
 696         mcryptd_fini_queue(&mqueue);
 697         crypto_unregister_template(&mcryptd_tmpl);
 698         free_percpu(mcryptd_flist);
 699 }
 700
 701 subsys_initcall(mcryptd_init);
 702 module_exit(mcryptd_exit);
 703
 704 MODULE_LICENSE("GPL");
 705 MODULE_DESCRIPTION("Software async multibuffer crypto daemon");
 706 MODULE_ALIAS_CRYPTO("mcryptd");