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_ahash_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                 cstate = list_first_entry_or_null(&flist->list,
 132                                 struct mcryptd_alg_cstate, flush_list);
 133                 if (!cstate || !cstate->flusher_engaged) {
 134                         mutex_unlock(&flist->lock);
 135                         return;
 136                 }
 137                 list_del(&cstate->flush_list);
 138                 cstate->flusher_engaged = false;
 139                 mutex_unlock(&flist->lock);
 140                 cstate->alg_state->flusher(cstate);
 141         }
 142 }
 143
 144 /*
 145  * Called in workqueue context, do one real cryption work (via
 146  * req->complete) and reschedule itself if there are more work to
 147  * do.
 148  */
 149 static void mcryptd_queue_worker(struct work_struct *work)
 150 {
 151         struct mcryptd_cpu_queue *cpu_queue;
 152         struct crypto_async_request *req, *backlog;
 153         int i;
 154
 155         /*
 156          * Need to loop through more than once for multi-buffer to
 157          * be effective.
 158          */
 159
 160         cpu_queue = container_of(work, struct mcryptd_cpu_queue, work);
 161         i = 0;
 162         while (i < MCRYPTD_BATCH || single_task_running()) {
 163                 /*
 164                  * preempt_disable/enable is used to prevent
 165                  * being preempted by mcryptd_enqueue_request()
 166                  */
 167                 local_bh_disable();
 168                 preempt_disable();
 169                 backlog = crypto_get_backlog(&cpu_queue->queue);
 170                 req = crypto_dequeue_request(&cpu_queue->queue);
 171                 preempt_enable();
 172                 local_bh_enable();
 173
 174                 if (!req) {
 175                         mcryptd_opportunistic_flush();
 176                         return;
 177                 }
 178
 179                 if (backlog)
 180                         backlog->complete(backlog, -EINPROGRESS);
 181                 req->complete(req, 0);
 182                 if (!cpu_queue->queue.qlen)
 183                         return;
 184                 ++i;
 185         }
 186         if (cpu_queue->queue.qlen)
 187                 queue_work(kcrypto_wq, &cpu_queue->work);
 188 }
 189
 190 void mcryptd_flusher(struct work_struct *__work)
 191 {
 192         struct  mcryptd_alg_cstate      *alg_cpu_state;
 193         struct  mcryptd_alg_state       *alg_state;
 194         struct  mcryptd_flush_list      *flist;
 195         int     cpu;
 196
 197         cpu = smp_processor_id();
 198         alg_cpu_state = container_of(to_delayed_work(__work),
 199                                      struct mcryptd_alg_cstate, flush);
 200         alg_state = alg_cpu_state->alg_state;
 201         if (alg_cpu_state->cpu != cpu)
 202                 pr_debug("mcryptd error: work on cpu %d, should be cpu %d\n",
 203                                 cpu, alg_cpu_state->cpu);
 204
 205         if (alg_cpu_state->flusher_engaged) {
 206                 flist = per_cpu_ptr(mcryptd_flist, cpu);
 207                 mutex_lock(&flist->lock);
 208                 list_del(&alg_cpu_state->flush_list);
 209                 alg_cpu_state->flusher_engaged = false;
 210                 mutex_unlock(&flist->lock);
 211                 alg_state->flusher(alg_cpu_state);
 212         }
 213 }
 214 EXPORT_SYMBOL_GPL(mcryptd_flusher);
 215
 216 static inline struct mcryptd_queue *mcryptd_get_queue(struct crypto_tfm *tfm)
 217 {
 218         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 219         struct mcryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
 220
 221         return ictx->queue;
 222 }
 223
 224 static void *mcryptd_alloc_instance(struct crypto_alg *alg, unsigned int head,
 225                                    unsigned int tail)
 226 {
 227         char *p;
 228         struct crypto_instance *inst;
 229         int err;
 230
 231         p = kzalloc(head + sizeof(*inst) + tail, GFP_KERNEL);
 232         if (!p)
 233                 return ERR_PTR(-ENOMEM);
 234
 235         inst = (void *)(p + head);
 236
 237         err = -ENAMETOOLONG;
 238         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 239                     "mcryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 240                 goto out_free_inst;
 241
 242         memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
 243
 244         inst->alg.cra_priority = alg->cra_priority + 50;
 245         inst->alg.cra_blocksize = alg->cra_blocksize;
 246         inst->alg.cra_alignmask = alg->cra_alignmask;
 247
 248 out:
 249         return p;
 250
 251 out_free_inst:
 252         kfree(p);
 253         p = ERR_PTR(err);
 254         goto out;
 255 }
 256
 257 static inline bool mcryptd_check_internal(struct rtattr **tb, u32 *type,
 258                                           u32 *mask)
 259 {
 260         struct crypto_attr_type *algt;
 261
 262         algt = crypto_get_attr_type(tb);
 263         if (IS_ERR(algt))
 264                 return false;
 265
 266         *type |= algt->type & CRYPTO_ALG_INTERNAL;
 267         *mask |= algt->mask & CRYPTO_ALG_INTERNAL;
 268
 269         if (*type & *mask & CRYPTO_ALG_INTERNAL)
 270                 return true;
 271         else
 272                 return false;
 273 }
 274
 275 static int mcryptd_hash_init_tfm(struct crypto_tfm *tfm)
 276 {
 277         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 278         struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst);
 279         struct crypto_ahash_spawn *spawn = &ictx->spawn;
 280         struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 281         struct crypto_ahash *hash;
 282
 283         hash = crypto_spawn_ahash(spawn);
 284         if (IS_ERR(hash))
 285                 return PTR_ERR(hash);
 286
 287         ctx->child = hash;
 288         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 289                                  sizeof(struct mcryptd_hash_request_ctx) +
 290                                  crypto_ahash_reqsize(hash));
 291         return 0;
 292 }
 293
 294 static void mcryptd_hash_exit_tfm(struct crypto_tfm *tfm)
 295 {
 296         struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 297
 298         crypto_free_ahash(ctx->child);
 299 }
 300
 301 static int mcryptd_hash_setkey(struct crypto_ahash *parent,
 302                                    const u8 *key, unsigned int keylen)
 303 {
 304         struct mcryptd_hash_ctx *ctx   = crypto_ahash_ctx(parent);
 305         struct crypto_ahash *child = ctx->child;
 306         int err;
 307
 308         crypto_ahash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 309         crypto_ahash_set_flags(child, crypto_ahash_get_flags(parent) &
 310                                       CRYPTO_TFM_REQ_MASK);
 311         err = crypto_ahash_setkey(child, key, keylen);
 312         crypto_ahash_set_flags(parent, crypto_ahash_get_flags(child) &
 313                                        CRYPTO_TFM_RES_MASK);
 314         return err;
 315 }
 316
 317 static int mcryptd_hash_enqueue(struct ahash_request *req,
 318                                 crypto_completion_t complete)
 319 {
 320         int ret;
 321
 322         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 323         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 324         struct mcryptd_queue *queue =
 325                 mcryptd_get_queue(crypto_ahash_tfm(tfm));
 326
 327         rctx->complete = req->base.complete;
 328         req->base.complete = complete;
 329
 330         ret = mcryptd_enqueue_request(queue, &req->base, rctx);
 331
 332         return ret;
 333 }
 334
 335 static void mcryptd_hash_init(struct crypto_async_request *req_async, int err)
 336 {
 337         struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 338         struct crypto_ahash *child = ctx->child;
 339         struct ahash_request *req = ahash_request_cast(req_async);
 340         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 341         struct ahash_request *desc = &rctx->areq;
 342
 343         if (unlikely(err == -EINPROGRESS))
 344                 goto out;
 345
 346         ahash_request_set_tfm(desc, child);
 347         ahash_request_set_callback(desc, CRYPTO_TFM_REQ_MAY_SLEEP,
 348                                                 rctx->complete, req_async);
 349
 350         rctx->out = req->result;
 351         err = crypto_ahash_init(desc);
 352
 353 out:
 354         local_bh_disable();
 355         rctx->complete(&req->base, err);
 356         local_bh_enable();
 357 }
 358
 359 static int mcryptd_hash_init_enqueue(struct ahash_request *req)
 360 {
 361         return mcryptd_hash_enqueue(req, mcryptd_hash_init);
 362 }
 363
 364 static void mcryptd_hash_update(struct crypto_async_request *req_async, int err)
 365 {
 366         struct ahash_request *req = ahash_request_cast(req_async);
 367         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 368
 369         if (unlikely(err == -EINPROGRESS))
 370                 goto out;
 371
 372         rctx->out = req->result;
 373         err = ahash_mcryptd_update(&rctx->areq);
 374         if (err) {
 375                 req->base.complete = rctx->complete;
 376                 goto out;
 377         }
 378
 379         return;
 380 out:
 381         local_bh_disable();
 382         rctx->complete(&req->base, err);
 383         local_bh_enable();
 384 }
 385
 386 static int mcryptd_hash_update_enqueue(struct ahash_request *req)
 387 {
 388         return mcryptd_hash_enqueue(req, mcryptd_hash_update);
 389 }
 390
 391 static void mcryptd_hash_final(struct crypto_async_request *req_async, int err)
 392 {
 393         struct ahash_request *req = ahash_request_cast(req_async);
 394         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 395
 396         if (unlikely(err == -EINPROGRESS))
 397                 goto out;
 398
 399         rctx->out = req->result;
 400         err = ahash_mcryptd_final(&rctx->areq);
 401         if (err) {
 402                 req->base.complete = rctx->complete;
 403                 goto out;
 404         }
 405
 406         return;
 407 out:
 408         local_bh_disable();
 409         rctx->complete(&req->base, err);
 410         local_bh_enable();
 411 }
 412
 413 static int mcryptd_hash_final_enqueue(struct ahash_request *req)
 414 {
 415         return mcryptd_hash_enqueue(req, mcryptd_hash_final);
 416 }
 417
 418 static void mcryptd_hash_finup(struct crypto_async_request *req_async, int err)
 419 {
 420         struct ahash_request *req = ahash_request_cast(req_async);
 421         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 422
 423         if (unlikely(err == -EINPROGRESS))
 424                 goto out;
 425         rctx->out = req->result;
 426         err = ahash_mcryptd_finup(&rctx->areq);
 427
 428         if (err) {
 429                 req->base.complete = rctx->complete;
 430                 goto out;
 431         }
 432
 433         return;
 434 out:
 435         local_bh_disable();
 436         rctx->complete(&req->base, err);
 437         local_bh_enable();
 438 }
 439
 440 static int mcryptd_hash_finup_enqueue(struct ahash_request *req)
 441 {
 442         return mcryptd_hash_enqueue(req, mcryptd_hash_finup);
 443 }
 444
 445 static void mcryptd_hash_digest(struct crypto_async_request *req_async, int err)
 446 {
 447         struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 448         struct crypto_ahash *child = ctx->child;
 449         struct ahash_request *req = ahash_request_cast(req_async);
 450         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 451         struct ahash_request *desc = &rctx->areq;
 452
 453         if (unlikely(err == -EINPROGRESS))
 454                 goto out;
 455
 456         ahash_request_set_tfm(desc, child);
 457         ahash_request_set_callback(desc, CRYPTO_TFM_REQ_MAY_SLEEP,
 458                                                 rctx->complete, req_async);
 459
 460         rctx->out = req->result;
 461         err = ahash_mcryptd_digest(desc);
 462
 463 out:
 464         local_bh_disable();
 465         rctx->complete(&req->base, err);
 466         local_bh_enable();
 467 }
 468
 469 static int mcryptd_hash_digest_enqueue(struct ahash_request *req)
 470 {
 471         return mcryptd_hash_enqueue(req, mcryptd_hash_digest);
 472 }
 473
 474 static int mcryptd_hash_export(struct ahash_request *req, void *out)
 475 {
 476         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 477
 478         return crypto_ahash_export(&rctx->areq, out);
 479 }
 480
 481 static int mcryptd_hash_import(struct ahash_request *req, const void *in)
 482 {
 483         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 484
 485         return crypto_ahash_import(&rctx->areq, in);
 486 }
 487
 488 static int mcryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
 489                               struct mcryptd_queue *queue)
 490 {
 491         struct hashd_instance_ctx *ctx;
 492         struct ahash_instance *inst;
 493         struct hash_alg_common *halg;
 494         struct crypto_alg *alg;
 495         u32 type = 0;
 496         u32 mask = 0;
 497         int err;
 498
 499         if (!mcryptd_check_internal(tb, &type, &mask))
 500                 return -EINVAL;
 501
 502         halg = ahash_attr_alg(tb[1], type, mask);
 503         if (IS_ERR(halg))
 504                 return PTR_ERR(halg);
 505
 506         alg = &halg->base;
 507         pr_debug("crypto: mcryptd hash alg: %s\n", alg->cra_name);
 508         inst = mcryptd_alloc_instance(alg, ahash_instance_headroom(),
 509                                         sizeof(*ctx));
 510         err = PTR_ERR(inst);
 511         if (IS_ERR(inst))
 512                 goto out_put_alg;
 513
 514         ctx = ahash_instance_ctx(inst);
 515         ctx->queue = queue;
 516
 517         err = crypto_init_ahash_spawn(&ctx->spawn, halg,
 518                                       ahash_crypto_instance(inst));
 519         if (err)
 520                 goto out_free_inst;
 521
 522         type = CRYPTO_ALG_ASYNC;
 523         if (alg->cra_flags & CRYPTO_ALG_INTERNAL)
 524                 type |= CRYPTO_ALG_INTERNAL;
 525         inst->alg.halg.base.cra_flags = type;
 526
 527         inst->alg.halg.digestsize = halg->digestsize;
 528         inst->alg.halg.statesize = halg->statesize;
 529         inst->alg.halg.base.cra_ctxsize = sizeof(struct mcryptd_hash_ctx);
 530
 531         inst->alg.halg.base.cra_init = mcryptd_hash_init_tfm;
 532         inst->alg.halg.base.cra_exit = mcryptd_hash_exit_tfm;
 533
 534         inst->alg.init   = mcryptd_hash_init_enqueue;
 535         inst->alg.update = mcryptd_hash_update_enqueue;
 536         inst->alg.final  = mcryptd_hash_final_enqueue;
 537         inst->alg.finup  = mcryptd_hash_finup_enqueue;
 538         inst->alg.export = mcryptd_hash_export;
 539         inst->alg.import = mcryptd_hash_import;
 540         inst->alg.setkey = mcryptd_hash_setkey;
 541         inst->alg.digest = mcryptd_hash_digest_enqueue;
 542
 543         err = ahash_register_instance(tmpl, inst);
 544         if (err) {
 545                 crypto_drop_ahash(&ctx->spawn);
 546 out_free_inst:
 547                 kfree(inst);
 548         }
 549
 550 out_put_alg:
 551         crypto_mod_put(alg);
 552         return err;
 553 }
 554
 555 static struct mcryptd_queue mqueue;
 556
 557 static int mcryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
 558 {
 559         struct crypto_attr_type *algt;
 560
 561         algt = crypto_get_attr_type(tb);
 562         if (IS_ERR(algt))
 563                 return PTR_ERR(algt);
 564
 565         switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
 566         case CRYPTO_ALG_TYPE_DIGEST:
 567                 return mcryptd_create_hash(tmpl, tb, &mqueue);
 568         break;
 569         }
 570
 571         return -EINVAL;
 572 }
 573
 574 static void mcryptd_free(struct crypto_instance *inst)
 575 {
 576         struct mcryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
 577         struct hashd_instance_ctx *hctx = crypto_instance_ctx(inst);
 578
 579         switch (inst->alg.cra_flags & CRYPTO_ALG_TYPE_MASK) {
 580         case CRYPTO_ALG_TYPE_AHASH:
 581                 crypto_drop_ahash(&hctx->spawn);
 582                 kfree(ahash_instance(inst));
 583                 return;
 584         default:
 585                 crypto_drop_spawn(&ctx->spawn);
 586                 kfree(inst);
 587         }
 588 }
 589
 590 static struct crypto_template mcryptd_tmpl = {
 591         .name = "mcryptd",
 592         .create = mcryptd_create,
 593         .free = mcryptd_free,
 594         .module = THIS_MODULE,
 595 };
 596
 597 struct mcryptd_ahash *mcryptd_alloc_ahash(const char *alg_name,
 598                                         u32 type, u32 mask)
 599 {
 600         char mcryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 601         struct crypto_ahash *tfm;
 602
 603         if (snprintf(mcryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 604                      "mcryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 605                 return ERR_PTR(-EINVAL);
 606         tfm = crypto_alloc_ahash(mcryptd_alg_name, type, mask);
 607         if (IS_ERR(tfm))
 608                 return ERR_CAST(tfm);
 609         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 610                 crypto_free_ahash(tfm);
 611                 return ERR_PTR(-EINVAL);
 612         }
 613
 614         return __mcryptd_ahash_cast(tfm);
 615 }
 616 EXPORT_SYMBOL_GPL(mcryptd_alloc_ahash);
 617
 618 int ahash_mcryptd_digest(struct ahash_request *desc)
 619 {
 620         return crypto_ahash_init(desc) ?: ahash_mcryptd_finup(desc);
 621 }
 622
 623 int ahash_mcryptd_update(struct ahash_request *desc)
 624 {
 625         /* alignment is to be done by multi-buffer crypto algorithm if needed */
 626
 627         return crypto_ahash_update(desc);
 628 }
 629
 630 int ahash_mcryptd_finup(struct ahash_request *desc)
 631 {
 632         /* alignment is to be done by multi-buffer crypto algorithm if needed */
 633
 634         return crypto_ahash_finup(desc);
 635 }
 636
 637 int ahash_mcryptd_final(struct ahash_request *desc)
 638 {
 639         /* alignment is to be done by multi-buffer crypto algorithm if needed */
 640
 641         return crypto_ahash_final(desc);
 642 }
 643
 644 struct crypto_ahash *mcryptd_ahash_child(struct mcryptd_ahash *tfm)
 645 {
 646         struct mcryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
 647
 648         return ctx->child;
 649 }
 650 EXPORT_SYMBOL_GPL(mcryptd_ahash_child);
 651
 652 struct ahash_request *mcryptd_ahash_desc(struct ahash_request *req)
 653 {
 654         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 655         return &rctx->areq;
 656 }
 657 EXPORT_SYMBOL_GPL(mcryptd_ahash_desc);
 658
 659 void mcryptd_free_ahash(struct mcryptd_ahash *tfm)
 660 {
 661         crypto_free_ahash(&tfm->base);
 662 }
 663 EXPORT_SYMBOL_GPL(mcryptd_free_ahash);
 664
 665 static int __init mcryptd_init(void)
 666 {
 667         int err, cpu;
 668         struct mcryptd_flush_list *flist;
 669
 670         mcryptd_flist = alloc_percpu(struct mcryptd_flush_list);
 671         for_each_possible_cpu(cpu) {
 672                 flist = per_cpu_ptr(mcryptd_flist, cpu);
 673                 INIT_LIST_HEAD(&flist->list);
 674                 mutex_init(&flist->lock);
 675         }
 676
 677         err = mcryptd_init_queue(&mqueue, MCRYPTD_MAX_CPU_QLEN);
 678         if (err) {
 679                 free_percpu(mcryptd_flist);
 680                 return err;
 681         }
 682
 683         err = crypto_register_template(&mcryptd_tmpl);
 684         if (err) {
 685                 mcryptd_fini_queue(&mqueue);
 686                 free_percpu(mcryptd_flist);
 687         }
 688
 689         return err;
 690 }
 691
 692 static void __exit mcryptd_exit(void)
 693 {
 694         mcryptd_fini_queue(&mqueue);
 695         crypto_unregister_template(&mcryptd_tmpl);
 696         free_percpu(mcryptd_flist);
 697 }
 698
 699 subsys_initcall(mcryptd_init);
 700 module_exit(mcryptd_exit);
 701
 702 MODULE_LICENSE("GPL");
 703 MODULE_DESCRIPTION("Software async multibuffer crypto daemon");
 704 MODULE_ALIAS_CRYPTO("mcryptd");