ioctl.c

   1 /*
   2  * Driver for /dev/crypto device (aka CryptoDev)
   3  *
   4  * Copyright (c) 2004 Michal Ludvig <mludvig@logix.net.nz>, SuSE Labs
   5  * Copyright (c) 2009,2010,2011 Nikos Mavrogiannopoulos <nmav@gnutls.org>
   6  * Copyright (c) 2010 Phil Sutter
   7  *
   8  * This file is part of linux cryptodev.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version 2
  13  * of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc.,
  23  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  24  */
  25
  26 /*
  27  * Device /dev/crypto provides an interface for
  28  * accessing kernel CryptoAPI algorithms (ciphers,
  29  * hashes) from userspace programs.
  30  *
  31  * /dev/crypto interface was originally introduced in
  32  * OpenBSD and this module attempts to keep the API.
  33  *
  34  */
  35
  36 #include <crypto/hash.h>
  37 #include <linux/crypto.h>
  38 #include <linux/mm.h>
  39 #include <linux/highmem.h>
  40 #include <linux/ioctl.h>
  41 #include <linux/random.h>
  42 #include <linux/syscalls.h>
  43 #include <linux/pagemap.h>
  44 #include <linux/poll.h>
  45 #include <linux/uaccess.h>
  46 #include <crypto/cryptodev.h>
  47 #include <linux/scatterlist.h>
  48 #include "cryptodev_int.h"
  49 #include "zc.h"
  50 #include "version.h"
  51
  52 MODULE_AUTHOR("Nikos Mavrogiannopoulos <nmav@gnutls.org>");
  53 MODULE_DESCRIPTION("CryptoDev driver");
  54 MODULE_LICENSE("GPL");
  55
  56 /* ====== Compile-time config ====== */
  57
  58 /* Default (pre-allocated) and maximum size of the job queue.
  59  * These are free, pending and done items all together. */
  60 #define DEF_COP_RINGSIZE 16
  61 #define MAX_COP_RINGSIZE 64
  62
  63 /* ====== Module parameters ====== */
  64
  65 int cryptodev_verbosity;
  66 module_param(cryptodev_verbosity, int, 0644);
  67 MODULE_PARM_DESC(cryptodev_verbosity, "0: normal, 1: verbose, 2: debug");
  68
  69 /* ====== CryptoAPI ====== */
  70 struct todo_list_item {
  71         struct list_head __hook;
  72         struct kernel_crypt_op kcop;
  73         int result;
  74 };
  75
  76 struct locked_list {
  77         struct list_head list;
  78         struct mutex lock;
  79 };
  80
  81 struct crypt_priv {
  82         struct fcrypt fcrypt;
  83         struct locked_list free, todo, done;
  84         int itemcount;
  85         struct work_struct cryptask;
  86         wait_queue_head_t user_waiter;
  87 };
  88
  89 #define FILL_SG(sg, ptr, len)                                   \
  90         do {                                                    \
  91                 (sg)->page = virt_to_page(ptr);                 \
  92                 (sg)->offset = offset_in_page(ptr);             \
  93                 (sg)->length = len;                             \
  94                 (sg)->dma_address = 0;                          \
  95         } while (0)
  96
  97 /* cryptodev's own workqueue, keeps crypto tasks from disturbing the force */
  98 static struct workqueue_struct *cryptodev_wq;
  99
 100 /* Prepare session for future use. */
 101 static int
 102 crypto_create_session(struct fcrypt *fcr, struct session_op *sop)
 103 {
 104         struct csession *ses_new = NULL, *ses_ptr;
 105         int ret = 0;
 106         const char *alg_name = NULL;
 107         const char *hash_name = NULL;
 108         int hmac_mode = 1, stream = 0, aead = 0;
 109
 110         /* Does the request make sense? */
 111         if (unlikely(!sop->cipher && !sop->mac)) {
 112                 dprintk(1, KERN_DEBUG, "Both 'cipher' and 'mac' unset.\n");
 113                 return -EINVAL;
 114         }
 115
 116         switch (sop->cipher) {
 117         case 0:
 118                 break;
 119         case CRYPTO_DES_CBC:
 120                 alg_name = "cbc(des)";
 121                 break;
 122         case CRYPTO_3DES_CBC:
 123                 alg_name = "cbc(des3_ede)";
 124                 break;
 125         case CRYPTO_BLF_CBC:
 126                 alg_name = "cbc(blowfish)";
 127                 break;
 128         case CRYPTO_AES_CBC:
 129                 alg_name = "cbc(aes)";
 130                 break;
 131         case CRYPTO_AES_ECB:
 132                 alg_name = "ecb(aes)";
 133                 break;
 134         case CRYPTO_CAMELLIA_CBC:
 135                 alg_name = "cbc(camelia)";
 136                 break;
 137         case CRYPTO_AES_CTR:
 138                 alg_name = "ctr(aes)";
 139                 stream = 1;
 140                 break;
 141         case CRYPTO_AES_GCM:
 142                 alg_name = "gcm(aes)";
 143                 stream = 1;
 144                 aead = 1;
 145                 break;
 146         case CRYPTO_NULL:
 147                 alg_name = "ecb(cipher_null)";
 148                 stream = 1;
 149                 break;
 150         default:
 151                 dprintk(1, KERN_DEBUG, "%s: bad cipher: %d\n", __func__,
 152                         sop->cipher);
 153                 return -EINVAL;
 154         }
 155
 156         switch (sop->mac) {
 157         case 0:
 158                 break;
 159         case CRYPTO_MD5_HMAC:
 160                 hash_name = "hmac(md5)";
 161                 break;
 162         case CRYPTO_RIPEMD160_HMAC:
 163                 hash_name = "hmac(rmd160)";
 164                 break;
 165         case CRYPTO_SHA1_HMAC:
 166                 hash_name = "hmac(sha1)";
 167                 break;
 168         case CRYPTO_SHA2_256_HMAC:
 169                 hash_name = "hmac(sha256)";
 170                 break;
 171         case CRYPTO_SHA2_384_HMAC:
 172                 hash_name = "hmac(sha384)";
 173                 break;
 174         case CRYPTO_SHA2_512_HMAC:
 175                 hash_name = "hmac(sha512)";
 176                 break;
 177
 178         /* non-hmac cases */
 179         case CRYPTO_MD5:
 180                 hash_name = "md5";
 181                 hmac_mode = 0;
 182                 break;
 183         case CRYPTO_RIPEMD160:
 184                 hash_name = "rmd160";
 185                 hmac_mode = 0;
 186                 break;
 187         case CRYPTO_SHA1:
 188                 hash_name = "sha1";
 189                 hmac_mode = 0;
 190                 break;
 191         case CRYPTO_SHA2_256:
 192                 hash_name = "sha256";
 193                 hmac_mode = 0;
 194                 break;
 195         case CRYPTO_SHA2_384:
 196                 hash_name = "sha384";
 197                 hmac_mode = 0;
 198                 break;
 199         case CRYPTO_SHA2_512:
 200                 hash_name = "sha512";
 201                 hmac_mode = 0;
 202                 break;
 203         default:
 204                 dprintk(1, KERN_DEBUG, "%s: bad mac: %d\n", __func__,
 205                         sop->mac);
 206                 return -EINVAL;
 207         }
 208
 209         /* Create a session and put it to the list. */
 210         ses_new = kzalloc(sizeof(*ses_new), GFP_KERNEL);
 211         if (!ses_new)
 212                 return -ENOMEM;
 213
 214         /* Set-up crypto transform. */
 215         if (alg_name) {
 216                 uint8_t keyp[CRYPTO_CIPHER_MAX_KEY_LEN];
 217
 218                 if (unlikely(sop->keylen > CRYPTO_CIPHER_MAX_KEY_LEN)) {
 219                         dprintk(1, KERN_DEBUG,
 220                                 "Setting key failed for %s-%zu.\n",
 221                                 alg_name, (size_t)sop->keylen*8);
 222                         ret = -EINVAL;
 223                         goto error_cipher;
 224                 }
 225
 226                 if (unlikely(copy_from_user(keyp, sop->key, sop->keylen))) {
 227                         ret = -EFAULT;
 228                         goto error_cipher;
 229                 }
 230
 231                 ret = cryptodev_cipher_init(&ses_new->cdata, alg_name, keyp,
 232                                                 sop->keylen, stream, aead);
 233                 if (ret < 0) {
 234                         dprintk(1, KERN_DEBUG,
 235                                 "%s: Failed to load cipher for %s\n",
 236                                 __func__, alg_name);
 237                         ret = -EINVAL;
 238                         goto error_cipher;
 239                 }
 240         }
 241
 242         if (hash_name && aead == 0) {
 243                 uint8_t keyp[CRYPTO_HMAC_MAX_KEY_LEN];
 244
 245                 if (unlikely(sop->mackeylen > CRYPTO_HMAC_MAX_KEY_LEN)) {
 246                         dprintk(1, KERN_DEBUG,
 247                                 "Setting key failed for %s-%zu.\n",
 248                                 alg_name, (size_t)sop->mackeylen*8);
 249                         ret = -EINVAL;
 250                         goto error_hash;
 251                 }
 252
 253                 if (sop->mackey && unlikely(copy_from_user(keyp, sop->mackey,
 254                                             sop->mackeylen))) {
 255                         ret = -EFAULT;
 256                         goto error_hash;
 257                 }
 258
 259                 ret = cryptodev_hash_init(&ses_new->hdata, hash_name, hmac_mode,
 260                                                         keyp, sop->mackeylen);
 261                 if (ret != 0) {
 262                         dprintk(1, KERN_DEBUG,
 263                         "%s: Failed to load hash for %s\n",
 264                         __func__, hash_name);
 265                         ret = -EINVAL;
 266                         goto error_hash;
 267                 }
 268         }
 269
 270         ses_new->alignmask = max(ses_new->cdata.alignmask,
 271                                                   ses_new->hdata.alignmask);
 272         dprintk(2, KERN_DEBUG, "%s: got alignmask %d\n", __func__, ses_new->alignmask);
 273
 274         ses_new->array_size = DEFAULT_PREALLOC_PAGES;
 275         dprintk(2, KERN_DEBUG, "%s: preallocating for %d user pages\n",
 276                         __func__, ses_new->array_size);
 277         ses_new->pages = kzalloc(ses_new->array_size *
 278                         sizeof(struct page *), GFP_KERNEL);
 279         ses_new->sg = kzalloc(ses_new->array_size *
 280                         sizeof(struct scatterlist), GFP_KERNEL);
 281         if (ses_new->sg == NULL || ses_new->pages == NULL) {
 282                 dprintk(0, KERN_DEBUG, "Memory error\n");
 283                 ret = -ENOMEM;
 284                 goto error_hash;
 285         }
 286
 287         /* put the new session to the list */
 288         get_random_bytes(&ses_new->sid, sizeof(ses_new->sid));
 289         mutex_init(&ses_new->sem);
 290
 291         mutex_lock(&fcr->sem);
 292 restart:
 293         list_for_each_entry(ses_ptr, &fcr->list, entry) {
 294                 /* Check for duplicate SID */
 295                 if (unlikely(ses_new->sid == ses_ptr->sid)) {
 296                         get_random_bytes(&ses_new->sid, sizeof(ses_new->sid));
 297                         /* Unless we have a broken RNG this
 298                            shouldn't loop forever... ;-) */
 299                         goto restart;
 300                 }
 301         }
 302
 303         list_add(&ses_new->entry, &fcr->list);
 304         mutex_unlock(&fcr->sem);
 305
 306         /* Fill in some values for the user. */
 307         sop->ses = ses_new->sid;
 308
 309         return 0;
 310
 311 error_hash:
 312         cryptodev_cipher_deinit(&ses_new->cdata);
 313         kfree(ses_new->sg);
 314         kfree(ses_new->pages);
 315 error_cipher:
 316         kfree(ses_new);
 317
 318         return ret;
 319
 320 }
 321
 322 /* Everything that needs to be done when remowing a session. */
 323 static inline void
 324 crypto_destroy_session(struct csession *ses_ptr)
 325 {
 326         if (!mutex_trylock(&ses_ptr->sem)) {
 327                 dprintk(2, KERN_DEBUG, "Waiting for semaphore of sid=0x%08X\n",
 328                         ses_ptr->sid);
 329                 mutex_lock(&ses_ptr->sem);
 330         }
 331         dprintk(2, KERN_DEBUG, "Removed session 0x%08X\n", ses_ptr->sid);
 332         cryptodev_cipher_deinit(&ses_ptr->cdata);
 333         cryptodev_hash_deinit(&ses_ptr->hdata);
 334         dprintk(2, KERN_DEBUG, "%s: freeing space for %d user pages\n",
 335                         __func__, ses_ptr->array_size);
 336         kfree(ses_ptr->pages);
 337         kfree(ses_ptr->sg);
 338         mutex_unlock(&ses_ptr->sem);
 339         kfree(ses_ptr);
 340 }
 341
 342 /* Look up a session by ID and remove. */
 343 static int
 344 crypto_finish_session(struct fcrypt *fcr, uint32_t sid)
 345 {
 346         struct csession *tmp, *ses_ptr;
 347         struct list_head *head;
 348         int ret = 0;
 349
 350         mutex_lock(&fcr->sem);
 351         head = &fcr->list;
 352         list_for_each_entry_safe(ses_ptr, tmp, head, entry) {
 353                 if (ses_ptr->sid == sid) {
 354                         list_del(&ses_ptr->entry);
 355                         crypto_destroy_session(ses_ptr);
 356                         break;
 357                 }
 358         }
 359
 360         if (unlikely(!ses_ptr)) {
 361                 dprintk(1, KERN_ERR, "Session with sid=0x%08X not found!\n",
 362                         sid);
 363                 ret = -ENOENT;
 364         }
 365         mutex_unlock(&fcr->sem);
 366
 367         return ret;
 368 }
 369
 370 /* Remove all sessions when closing the file */
 371 static int
 372 crypto_finish_all_sessions(struct fcrypt *fcr)
 373 {
 374         struct csession *tmp, *ses_ptr;
 375         struct list_head *head;
 376
 377         mutex_lock(&fcr->sem);
 378
 379         head = &fcr->list;
 380         list_for_each_entry_safe(ses_ptr, tmp, head, entry) {
 381                 list_del(&ses_ptr->entry);
 382                 crypto_destroy_session(ses_ptr);
 383         }
 384         mutex_unlock(&fcr->sem);
 385
 386         return 0;
 387 }
 388
 389 /* Look up session by session ID. The returned session is locked. */
 390 struct csession *
 391 crypto_get_session_by_sid(struct fcrypt *fcr, uint32_t sid)
 392 {
 393         struct csession *ses_ptr, *retval = NULL;
 394
 395         if (unlikely(fcr == NULL))
 396                 return NULL;
 397
 398         mutex_lock(&fcr->sem);
 399         list_for_each_entry(ses_ptr, &fcr->list, entry) {
 400                 if (ses_ptr->sid == sid) {
 401                         mutex_lock(&ses_ptr->sem);
 402                         retval = ses_ptr;
 403                         break;
 404                 }
 405         }
 406         mutex_unlock(&fcr->sem);
 407
 408         return retval;
 409 }
 410
 411 static void cryptask_routine(struct work_struct *work)
 412 {
 413         struct crypt_priv *pcr = container_of(work, struct crypt_priv, cryptask);
 414         struct todo_list_item *item;
 415         LIST_HEAD(tmp);
 416
 417         /* fetch all pending jobs into the temporary list */
 418         mutex_lock(&pcr->todo.lock);
 419         list_cut_position(&tmp, &pcr->todo.list, pcr->todo.list.prev);
 420         mutex_unlock(&pcr->todo.lock);
 421
 422         /* handle each job locklessly */
 423         list_for_each_entry(item, &tmp, __hook) {
 424                 item->result = crypto_run(&pcr->fcrypt, &item->kcop);
 425                 if (unlikely(item->result))
 426                         dprintk(0, KERN_ERR, "%s: crypto_run() failed: %d\n",
 427                                         __func__, item->result);
 428         }
 429
 430         /* push all handled jobs to the done list at once */
 431         mutex_lock(&pcr->done.lock);
 432         list_splice_tail(&tmp, &pcr->done.list);
 433         mutex_unlock(&pcr->done.lock);
 434
 435         /* wake for POLLIN */
 436         wake_up_interruptible(&pcr->user_waiter);
 437 }
 438
 439 /* ====== /dev/crypto ====== */
 440
 441 static int
 442 cryptodev_open(struct inode *inode, struct file *filp)
 443 {
 444         struct todo_list_item *tmp;
 445         struct crypt_priv *pcr;
 446         int i;
 447
 448         pcr = kmalloc(sizeof(*pcr), GFP_KERNEL);
 449         if (!pcr)
 450                 return -ENOMEM;
 451
 452         memset(pcr, 0, sizeof(*pcr));
 453         mutex_init(&pcr->fcrypt.sem);
 454         INIT_LIST_HEAD(&pcr->fcrypt.list);
 455
 456         INIT_LIST_HEAD(&pcr->free.list);
 457         INIT_LIST_HEAD(&pcr->todo.list);
 458         INIT_LIST_HEAD(&pcr->done.list);
 459         INIT_WORK(&pcr->cryptask, cryptask_routine);
 460         mutex_init(&pcr->free.lock);
 461         mutex_init(&pcr->todo.lock);
 462         mutex_init(&pcr->done.lock);
 463         init_waitqueue_head(&pcr->user_waiter);
 464
 465         for (i = 0; i < DEF_COP_RINGSIZE; i++) {
 466                 tmp = kzalloc(sizeof(struct todo_list_item), GFP_KERNEL);
 467                 pcr->itemcount++;
 468                 dprintk(2, KERN_DEBUG, "%s: allocated new item at %lx\n",
 469                                 __func__, (unsigned long)tmp);
 470                 list_add(&tmp->__hook, &pcr->free.list);
 471         }
 472
 473         filp->private_data = pcr;
 474         dprintk(2, KERN_DEBUG,
 475                 "Cryptodev handle initialised, %d elements in queue\n",
 476                 DEF_COP_RINGSIZE);
 477         return 0;
 478 }
 479
 480 static int
 481 cryptodev_release(struct inode *inode, struct file *filp)
 482 {
 483         struct crypt_priv *pcr = filp->private_data;
 484         struct todo_list_item *item, *item_safe;
 485         int items_freed = 0;
 486
 487         if (!pcr)
 488                 return 0;
 489
 490         cancel_work_sync(&pcr->cryptask);
 491
 492         mutex_destroy(&pcr->todo.lock);
 493         mutex_destroy(&pcr->done.lock);
 494         mutex_destroy(&pcr->free.lock);
 495
 496         list_splice_tail(&pcr->todo.list, &pcr->free.list);
 497         list_splice_tail(&pcr->done.list, &pcr->free.list);
 498
 499         list_for_each_entry_safe(item, item_safe, &pcr->free.list, __hook) {
 500                 dprintk(2, KERN_DEBUG, "%s: freeing item at %lx\n",
 501                                 __func__, (unsigned long)item);
 502                 list_del(&item->__hook);
 503                 kfree(item);
 504                 items_freed++;
 505
 506         }
 507         if (items_freed != pcr->itemcount) {
 508                 dprintk(0, KERN_ERR,
 509                         "%s: freed %d items, but %d should exist!\n",
 510                         __func__, items_freed, pcr->itemcount);
 511         }
 512
 513         crypto_finish_all_sessions(&pcr->fcrypt);
 514         kfree(pcr);
 515         filp->private_data = NULL;
 516
 517         dprintk(2, KERN_DEBUG,
 518                 "Cryptodev handle deinitialised, %d elements freed\n",
 519                 items_freed);
 520         return 0;
 521 }
 522
 523 static int
 524 clonefd(struct file *filp)
 525 {
 526         int ret;
 527         ret = get_unused_fd();
 528         if (ret >= 0) {
 529                         get_file(filp);
 530                         fd_install(ret, filp);
 531         }
 532
 533         return ret;
 534 }
 535
 536 /* enqueue a job for asynchronous completion
 537  *
 538  * returns:
 539  * -EBUSY when there are no free queue slots left
 540  *        (and the number of slots has reached it MAX_COP_RINGSIZE)
 541  * -EFAULT when there was a memory allocation error
 542  * 0 on success */
 543 static int crypto_async_run(struct crypt_priv *pcr, struct kernel_crypt_op *kcop)
 544 {
 545         struct todo_list_item *item = NULL;
 546
 547         mutex_lock(&pcr->free.lock);
 548         if (likely(!list_empty(&pcr->free.list))) {
 549                 item = list_first_entry(&pcr->free.list,
 550                                 struct todo_list_item, __hook);
 551                 list_del(&item->__hook);
 552         } else if (pcr->itemcount < MAX_COP_RINGSIZE) {
 553                 pcr->itemcount++;
 554         } else {
 555                 mutex_unlock(&pcr->free.lock);
 556                 return -EBUSY;
 557         }
 558         mutex_unlock(&pcr->free.lock);
 559
 560         if (unlikely(!item)) {
 561                 item = kzalloc(sizeof(struct todo_list_item), GFP_KERNEL);
 562                 if (unlikely(!item))
 563                         return -EFAULT;
 564                 dprintk(1, KERN_INFO, "%s: increased item count to %d\n",
 565                                 __func__, pcr->itemcount);
 566         }
 567
 568         memcpy(&item->kcop, kcop, sizeof(struct kernel_crypt_op));
 569
 570         mutex_lock(&pcr->todo.lock);
 571         list_add_tail(&item->__hook, &pcr->todo.list);
 572         mutex_unlock(&pcr->todo.lock);
 573
 574         queue_work(cryptodev_wq, &pcr->cryptask);
 575         return 0;
 576 }
 577
 578 /* get the first completed job from the "done" queue
 579  *
 580  * returns:
 581  * -EBUSY if no completed jobs are ready (yet)
 582  * the return value of crypto_run() otherwise */
 583 static int crypto_async_fetch(struct crypt_priv *pcr,
 584                 struct kernel_crypt_op *kcop)
 585 {
 586         struct todo_list_item *item;
 587         int retval;
 588
 589         mutex_lock(&pcr->done.lock);
 590         if (list_empty(&pcr->done.list)) {
 591                 mutex_unlock(&pcr->done.lock);
 592                 return -EBUSY;
 593         }
 594         item = list_first_entry(&pcr->done.list, struct todo_list_item, __hook);
 595         list_del(&item->__hook);
 596         mutex_unlock(&pcr->done.lock);
 597
 598         memcpy(kcop, &item->kcop, sizeof(struct kernel_crypt_op));
 599         retval = item->result;
 600
 601         mutex_lock(&pcr->free.lock);
 602         list_add_tail(&item->__hook, &pcr->free.list);
 603         mutex_unlock(&pcr->free.lock);
 604
 605         /* wake for POLLOUT */
 606         wake_up_interruptible(&pcr->user_waiter);
 607
 608         return retval;
 609 }
 610
 611 /* this function has to be called from process context */
 612 static int fill_kcop_from_cop(struct kernel_crypt_op *kcop, struct fcrypt *fcr)
 613 {
 614         struct crypt_op *cop = &kcop->cop;
 615         struct csession *ses_ptr;
 616         int rc;
 617
 618         /* this also enters ses_ptr->sem */
 619         ses_ptr = crypto_get_session_by_sid(fcr, cop->ses);
 620         if (unlikely(!ses_ptr)) {
 621                 dprintk(1, KERN_ERR, "invalid session ID=0x%08X\n", cop->ses);
 622                 return -EINVAL;
 623         }
 624         kcop->ivlen = cop->iv ? ses_ptr->cdata.ivsize : 0;
 625         kcop->digestsize = 0; /* will be updated during operation */
 626
 627         crypto_put_session(ses_ptr);
 628
 629         kcop->task = current;
 630         kcop->mm = current->mm;
 631
 632         if (cop->iv) {
 633                 rc = copy_from_user(kcop->iv, cop->iv, kcop->ivlen);
 634                 if (unlikely(rc)) {
 635                         dprintk(1, KERN_ERR,
 636                                 "error copying IV (%d bytes), copy_from_user returned %d for address %lx\n",
 637                                 kcop->ivlen, rc, (unsigned long)cop->iv);
 638                         return -EFAULT;
 639                 }
 640         }
 641
 642         return 0;
 643 }
 644
 645 /* this function has to be called from process context */
 646 static int fill_cop_from_kcop(struct kernel_crypt_op *kcop, struct fcrypt *fcr)
 647 {
 648         int ret;
 649
 650         if (kcop->digestsize) {
 651                 ret = copy_to_user(kcop->cop.mac,
 652                                 kcop->hash_output, kcop->digestsize);
 653                 if (unlikely(ret))
 654                         return -EFAULT;
 655         }
 656         if (kcop->ivlen && kcop->cop.flags & COP_FLAG_WRITE_IV) {
 657                 ret = copy_to_user(kcop->cop.iv,
 658                                 kcop->iv, kcop->ivlen);
 659                 if (unlikely(ret))
 660                         return -EFAULT;
 661         }
 662         return 0;
 663 }
 664
 665 static int kcop_from_user(struct kernel_crypt_op *kcop,
 666                         struct fcrypt *fcr, void __user *arg)
 667 {
 668         if (unlikely(copy_from_user(&kcop->cop, arg, sizeof(kcop->cop))))
 669                 return -EFAULT;
 670
 671         return fill_kcop_from_cop(kcop, fcr);
 672 }
 673
 674 static int kcop_to_user(struct kernel_crypt_op *kcop,
 675                         struct fcrypt *fcr, void __user *arg)
 676 {
 677         int ret;
 678
 679         ret = fill_cop_from_kcop(kcop, fcr);
 680         if (unlikely(ret))
 681                 return ret;
 682
 683         if (unlikely(copy_to_user(arg, &kcop->cop, sizeof(kcop->cop))))
 684                 return -EFAULT;
 685         return 0;
 686 }
 687
 688 static inline void tfm_info_to_alg_info(struct alg_info *dst, struct crypto_tfm *tfm)
 689 {
 690         snprintf(dst->cra_name, CRYPTODEV_MAX_ALG_NAME,
 691                         "%s", crypto_tfm_alg_name(tfm));
 692         snprintf(dst->cra_driver_name, CRYPTODEV_MAX_ALG_NAME,
 693                         "%s", crypto_tfm_alg_driver_name(tfm));
 694 }
 695
 696 static int get_session_info(struct fcrypt *fcr, struct session_info_op *siop)
 697 {
 698         struct csession *ses_ptr;
 699
 700         /* this also enters ses_ptr->sem */
 701         ses_ptr = crypto_get_session_by_sid(fcr, siop->ses);
 702         if (unlikely(!ses_ptr)) {
 703                 dprintk(1, KERN_ERR, "invalid session ID=0x%08X\n", siop->ses);
 704                 return -EINVAL;
 705         }
 706
 707         if (ses_ptr->cdata.init) {
 708                 if (ses_ptr->cdata.aead == 0)
 709                         tfm_info_to_alg_info(&siop->cipher_info,
 710                                 crypto_ablkcipher_tfm(ses_ptr->cdata.async.s));
 711                 else
 712                         tfm_info_to_alg_info(&siop->cipher_info,
 713                                 crypto_aead_tfm(ses_ptr->cdata.async.as));
 714         }
 715         if (ses_ptr->hdata.init) {
 716                 tfm_info_to_alg_info(&siop->hash_info,
 717                                 crypto_ahash_tfm(ses_ptr->hdata.async.s));
 718         }
 719
 720         siop->alignmask = ses_ptr->alignmask;
 721
 722         crypto_put_session(ses_ptr);
 723         return 0;
 724 }
 725
 726 static long
 727 cryptodev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg_)
 728 {
 729         void __user *arg = (void __user *)arg_;
 730         int __user *p = arg;
 731         struct session_op sop;
 732         struct kernel_crypt_op kcop;
 733         struct kernel_crypt_auth_op kcaop;
 734         struct crypt_priv *pcr = filp->private_data;
 735         struct fcrypt *fcr;
 736         struct session_info_op siop;
 737         uint32_t ses;
 738         int ret, fd;
 739
 740         if (unlikely(!pcr))
 741                 BUG();
 742
 743         fcr = &pcr->fcrypt;
 744
 745         switch (cmd) {
 746         case CIOCASYMFEAT:
 747                 return put_user(0, p);
 748         case CRIOGET:
 749                 fd = clonefd(filp);
 750                 ret = put_user(fd, p);
 751                 if (unlikely(ret)) {
 752                         sys_close(fd);
 753                         return ret;
 754                 }
 755                 return ret;
 756         case CIOCGSESSION:
 757                 if (unlikely(copy_from_user(&sop, arg, sizeof(sop))))
 758                         return -EFAULT;
 759
 760                 ret = crypto_create_session(fcr, &sop);
 761                 if (unlikely(ret))
 762                         return ret;
 763                 ret = copy_to_user(arg, &sop, sizeof(sop));
 764                 if (unlikely(ret)) {
 765                         crypto_finish_session(fcr, sop.ses);
 766                         return -EFAULT;
 767                 }
 768                 return ret;
 769         case CIOCFSESSION:
 770                 ret = get_user(ses, (uint32_t __user *)arg);
 771                 if (unlikely(ret))
 772                         return ret;
 773                 ret = crypto_finish_session(fcr, ses);
 774                 return ret;
 775         case CIOCGSESSINFO:
 776                 if (unlikely(copy_from_user(&siop, arg, sizeof(siop))))
 777                         return -EFAULT;
 778
 779                 ret = get_session_info(fcr, &siop);
 780                 if (unlikely(ret))
 781                         return ret;
 782                 return copy_to_user(arg, &siop, sizeof(siop));
 783         case CIOCCRYPT:
 784                 if (unlikely(ret = kcop_from_user(&kcop, fcr, arg))) {
 785                         dprintk(1, KERN_WARNING, "Error copying from user");
 786                         return ret;
 787                 }
 788
 789                 ret = crypto_run(fcr, &kcop);
 790                 if (unlikely(ret)) {
 791                         dprintk(1, KERN_WARNING, "Error in crypto_run");
 792                         return ret;
 793                 }
 794
 795                 return kcop_to_user(&kcop, fcr, arg);
 796         case CIOCAUTHCRYPT:
 797                 if (unlikely(ret = kcaop_from_user(&kcaop, fcr, arg))) {
 798                         dprintk(1, KERN_WARNING, "Error copying from user");
 799                         return ret;
 800                 }
 801
 802                 ret = crypto_auth_run(fcr, &kcaop);
 803                 if (unlikely(ret)) {
 804                         dprintk(1, KERN_WARNING, "Error in crypto_auth_run");
 805                         return ret;
 806                 }
 807                 return kcaop_to_user(&kcaop, fcr, arg);
 808         case CIOCASYNCCRYPT:
 809                 if (unlikely(ret = kcop_from_user(&kcop, fcr, arg)))
 810                         return ret;
 811
 812                 return crypto_async_run(pcr, &kcop);
 813         case CIOCASYNCFETCH:
 814                 ret = crypto_async_fetch(pcr, &kcop);
 815                 if (unlikely(ret))
 816                         return ret;
 817
 818                 return kcop_to_user(&kcop, fcr, arg);
 819         default:
 820                 return -EINVAL;
 821         }
 822 }
 823
 824 /* compatibility code for 32bit userlands */
 825 #ifdef CONFIG_COMPAT
 826
 827 static inline void
 828 compat_to_session_op(struct compat_session_op *compat, struct session_op *sop)
 829 {
 830         sop->cipher = compat->cipher;
 831         sop->mac = compat->mac;
 832         sop->keylen = compat->keylen;
 833
 834         sop->key       = compat_ptr(compat->key);
 835         sop->mackeylen = compat->mackeylen;
 836         sop->mackey    = compat_ptr(compat->mackey);
 837         sop->ses       = compat->ses;
 838 }
 839
 840 static inline void
 841 session_op_to_compat(struct session_op *sop, struct compat_session_op *compat)
 842 {
 843         compat->cipher = sop->cipher;
 844         compat->mac = sop->mac;
 845         compat->keylen = sop->keylen;
 846
 847         compat->key       = ptr_to_compat(sop->key);
 848         compat->mackeylen = sop->mackeylen;
 849         compat->mackey    = ptr_to_compat(sop->mackey);
 850         compat->ses       = sop->ses;
 851 }
 852
 853 static inline void
 854 compat_to_crypt_op(struct compat_crypt_op *compat, struct crypt_op *cop)
 855 {
 856         cop->ses = compat->ses;
 857         cop->op = compat->op;
 858         cop->flags = compat->flags;
 859         cop->len = compat->len;
 860
 861         cop->src = compat_ptr(compat->src);
 862         cop->dst = compat_ptr(compat->dst);
 863         cop->mac = compat_ptr(compat->mac);
 864         cop->iv  = compat_ptr(compat->iv);
 865 }
 866
 867 static inline void
 868 crypt_op_to_compat(struct crypt_op *cop, struct compat_crypt_op *compat)
 869 {
 870         compat->ses = cop->ses;
 871         compat->op = cop->op;
 872         compat->flags = cop->flags;
 873         compat->len = cop->len;
 874
 875         compat->src = ptr_to_compat(cop->src);
 876         compat->dst = ptr_to_compat(cop->dst);
 877         compat->mac = ptr_to_compat(cop->mac);
 878         compat->iv  = ptr_to_compat(cop->iv);
 879 }
 880
 881 static int compat_kcop_from_user(struct kernel_crypt_op *kcop,
 882                                  struct fcrypt *fcr, void __user *arg)
 883 {
 884         struct compat_crypt_op compat_cop;
 885
 886         if (unlikely(copy_from_user(&compat_cop, arg, sizeof(compat_cop))))
 887                 return -EFAULT;
 888         compat_to_crypt_op(&compat_cop, &kcop->cop);
 889
 890         return fill_kcop_from_cop(kcop, fcr);
 891 }
 892
 893 static int compat_kcop_to_user(struct kernel_crypt_op *kcop,
 894                                  struct fcrypt *fcr, void __user *arg)
 895 {
 896         int ret;
 897         struct compat_crypt_op compat_cop;
 898
 899         ret = fill_cop_from_kcop(kcop, fcr);
 900         if (unlikely(ret)) {
 901                 dprintk(1, KERN_WARNING, "Error in fill_cop_from_kcop");
 902                 return ret;
 903         }
 904         crypt_op_to_compat(&kcop->cop, &compat_cop);
 905
 906         if (unlikely(copy_to_user(arg, &compat_cop, sizeof(compat_cop)))) {
 907                 dprintk(1, KERN_WARNING, "Error copying to user");
 908                 return -EFAULT;
 909         }
 910         return 0;
 911 }
 912
 913 static long
 914 cryptodev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg_)
 915 {
 916         void __user *arg = (void __user *)arg_;
 917         struct crypt_priv *pcr = file->private_data;
 918         struct fcrypt *fcr;
 919         struct session_op sop;
 920         struct compat_session_op compat_sop;
 921         struct kernel_crypt_op kcop;
 922         int ret;
 923
 924         if (unlikely(!pcr))
 925                 BUG();
 926
 927         fcr = &pcr->fcrypt;
 928
 929         switch (cmd) {
 930         case CIOCASYMFEAT:
 931         case CRIOGET:
 932         case CIOCFSESSION:
 933         case CIOCGSESSINFO:
 934                 return cryptodev_ioctl(file, cmd, arg_);
 935
 936         case COMPAT_CIOCGSESSION:
 937                 if (unlikely(copy_from_user(&compat_sop, arg,
 938                                             sizeof(compat_sop))))
 939                         return -EFAULT;
 940                 compat_to_session_op(&compat_sop, &sop);
 941
 942                 ret = crypto_create_session(fcr, &sop);
 943                 if (unlikely(ret))
 944                         return ret;
 945
 946                 session_op_to_compat(&sop, &compat_sop);
 947                 ret = copy_to_user(arg, &compat_sop, sizeof(compat_sop));
 948                 if (unlikely(ret)) {
 949                         crypto_finish_session(fcr, sop.ses);
 950                         return -EFAULT;
 951                 }
 952                 return ret;
 953
 954         case COMPAT_CIOCCRYPT:
 955                 ret = compat_kcop_from_user(&kcop, fcr, arg);
 956                 if (unlikely(ret))
 957                         return ret;
 958
 959                 ret = crypto_run(fcr, &kcop);
 960                 if (unlikely(ret))
 961                         return ret;
 962
 963                 return compat_kcop_to_user(&kcop, fcr, arg);
 964         case COMPAT_CIOCASYNCCRYPT:
 965                 if (unlikely(ret = compat_kcop_from_user(&kcop, fcr, arg)))
 966                         return ret;
 967
 968                 return crypto_async_run(pcr, &kcop);
 969         case COMPAT_CIOCASYNCFETCH:
 970                 ret = crypto_async_fetch(pcr, &kcop);
 971                 if (unlikely(ret))
 972                         return ret;
 973
 974                 return compat_kcop_to_user(&kcop, fcr, arg);
 975
 976         default:
 977                 return -EINVAL;
 978         }
 979 }
 980
 981 #endif /* CONFIG_COMPAT */
 982
 983 static unsigned int cryptodev_poll(struct file *file, poll_table *wait)
 984 {
 985         struct crypt_priv *pcr = file->private_data;
 986         int ret = 0;
 987
 988         poll_wait(file, &pcr->user_waiter, wait);
 989
 990         if (!list_empty_careful(&pcr->done.list))
 991                 ret |= POLLIN | POLLRDNORM;
 992         if (!list_empty_careful(&pcr->free.list) || pcr->itemcount < MAX_COP_RINGSIZE)
 993                 ret |= POLLOUT | POLLWRNORM;
 994
 995         return ret;
 996 }
 997
 998 static const struct file_operations cryptodev_fops = {
 999         .owner = THIS_MODULE,
1000         .open = cryptodev_open,
1001         .release = cryptodev_release,
1002         .unlocked_ioctl = cryptodev_ioctl,
1003 #ifdef CONFIG_COMPAT
1004         .compat_ioctl = cryptodev_compat_ioctl,
1005 #endif /* CONFIG_COMPAT */
1006         .poll = cryptodev_poll,
1007 };
1008
1009 static struct miscdevice cryptodev = {
1010         .minor = MISC_DYNAMIC_MINOR,
1011         .name = "crypto",
1012         .fops = &cryptodev_fops,
1013 };
1014
1015 static int __init
1016 cryptodev_register(void)
1017 {
1018         int rc;
1019
1020         rc = misc_register(&cryptodev);
1021         if (unlikely(rc)) {
1022                 printk(KERN_ERR PFX "registration of /dev/crypto failed\n");
1023                 return rc;
1024         }
1025
1026         return 0;
1027 }
1028
1029 static void __exit
1030 cryptodev_deregister(void)
1031 {
1032         misc_deregister(&cryptodev);
1033 }
1034
1035 /* ====== Module init/exit ====== */
1036 static int __init init_cryptodev(void)
1037 {
1038         int rc;
1039
1040         cryptodev_wq = create_workqueue("cryptodev_queue");
1041         if (unlikely(!cryptodev_wq)) {
1042                 printk(KERN_ERR PFX "failed to allocate the cryptodev workqueue\n");
1043                 return -EFAULT;
1044         }
1045
1046         rc = cryptodev_register();
1047         if (unlikely(rc)) {
1048                 destroy_workqueue(cryptodev_wq);
1049                 return rc;
1050         }
1051
1052         printk(KERN_INFO PFX "driver %s loaded.\n", VERSION);
1053
1054         return 0;
1055 }
1056
1057 static void __exit exit_cryptodev(void)
1058 {
1059         flush_workqueue(cryptodev_wq);
1060         destroy_workqueue(cryptodev_wq);
1061
1062         cryptodev_deregister();
1063         printk(KERN_INFO PFX "driver unloaded.\n");
1064 }
1065
1066 module_init(init_cryptodev);
1067 module_exit(exit_cryptodev);
1068