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