| | 1 | /* |
| | 2 | * Cryptographic API for algorithms (i.e., low-level API). |
| | 3 | * |
| | 4 | * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> |
| | 5 | * |
| | 6 | * This program is free software; you can redistribute it and/or modify it |
| | 7 | * under the terms of the GNU General Public License as published by the Free |
| | 8 | * Software Foundation; either version 2 of the License, or (at your option) |
| | 9 | * any later version. |
| | 10 | * |
| | 11 | */ |
| | 12 | |
| | 13 | #include <linux/err.h> |
| | 14 | #include <linux/errno.h> |
| | 15 | #include <linux/init.h> |
| | 16 | #include <linux/kernel.h> |
| | 17 | #include <linux/list.h> |
| | 18 | #include <linux/module.h> |
| | 19 | #include <linux/rtnetlink.h> |
| | 20 | #include <linux/slab.h> |
| | 21 | #include <linux/string.h> |
| | 22 | |
| | 23 | #include "internal.h" |
| | 24 | |
| | 25 | static LIST_HEAD(crypto_template_list); |
| | 26 | |
| | 27 | void crypto_larval_error(const char *name, u32 type, u32 mask) |
| | 28 | { |
| | 29 | struct crypto_alg *alg; |
| | 30 | |
| | 31 | alg = crypto_alg_lookup(name, type, mask); |
| | 32 | |
| | 33 | if (alg) { |
| | 34 | if (crypto_is_larval(alg)) { |
| | 35 | struct crypto_larval *larval = (void *)alg; |
| | 36 | complete_all(&larval->completion); |
| | 37 | } |
| | 38 | crypto_mod_put(alg); |
| | 39 | } |
| | 40 | } |
| | 41 | EXPORT_SYMBOL_GPL(crypto_larval_error); |
| | 42 | |
| | 43 | static inline int crypto_set_driver_name(struct crypto_alg *alg) |
| | 44 | { |
| | 45 | static const char suffix[] = "-generic"; |
| | 46 | char *driver_name = alg->cra_driver_name; |
| | 47 | int len; |
| | 48 | |
| | 49 | if (*driver_name) |
| | 50 | return 0; |
| | 51 | |
| | 52 | len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); |
| | 53 | if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME) |
| | 54 | return -ENAMETOOLONG; |
| | 55 | |
| | 56 | memcpy(driver_name + len, suffix, sizeof(suffix)); |
| | 57 | return 0; |
| | 58 | } |
| | 59 | |
| | 60 | static int crypto_check_alg(struct crypto_alg *alg) |
| | 61 | { |
| | 62 | if (alg->cra_alignmask & (alg->cra_alignmask + 1)) |
| | 63 | return -EINVAL; |
| | 64 | |
| | 65 | if (alg->cra_blocksize > PAGE_SIZE / 8) |
| | 66 | return -EINVAL; |
| | 67 | |
| | 68 | if (alg->cra_priority < 0) |
| | 69 | return -EINVAL; |
| | 70 | |
| | 71 | return crypto_set_driver_name(alg); |
| | 72 | } |
| | 73 | |
| | 74 | static void crypto_destroy_instance(struct crypto_alg *alg) |
| | 75 | { |
| | 76 | struct crypto_instance *inst = (void *)alg; |
| | 77 | struct crypto_template *tmpl = inst->tmpl; |
| | 78 | |
| | 79 | tmpl->free(inst); |
| | 80 | crypto_tmpl_put(tmpl); |
| | 81 | } |
| | 82 | |
| | 83 | static struct list_head *crypto_more_spawns(struct crypto_alg *alg, |
| | 84 | struct list_head *stack, |
| | 85 | struct list_head *top, |
| | 86 | struct list_head *secondary_spawns) |
| | 87 | { |
| | 88 | struct crypto_spawn *spawn, *n; |
| | 89 | |
| | 90 | if (list_empty(stack)) |
| | 91 | return NULL; |
| | 92 | |
| | 93 | spawn = list_first_entry(stack, struct crypto_spawn, list); |
| | 94 | n = list_entry(spawn->list.next, struct crypto_spawn, list); |
| | 95 | |
| | 96 | if (spawn->alg && &n->list != stack && !n->alg) |
| | 97 | n->alg = (n->list.next == stack) ? alg : |
| | 98 | &list_entry(n->list.next, struct crypto_spawn, |
| | 99 | list)->inst->alg; |
| | 100 | |
| | 101 | list_move(&spawn->list, secondary_spawns); |
| | 102 | |
| | 103 | return &n->list == stack ? top : &n->inst->alg.cra_users; |
| | 104 | } |
| | 105 | |
| | 106 | static void crypto_remove_spawn(struct crypto_spawn *spawn, |
| | 107 | struct list_head *list) |
| | 108 | { |
| | 109 | struct crypto_instance *inst = spawn->inst; |
| | 110 | struct crypto_template *tmpl = inst->tmpl; |
| | 111 | |
| | 112 | if (crypto_is_dead(&inst->alg)) |
| | 113 | return; |
| | 114 | |
| | 115 | inst->alg.cra_flags |= CRYPTO_ALG_DEAD; |
| | 116 | if (hlist_unhashed(&inst->list)) |
| | 117 | return; |
| | 118 | |
| | 119 | if (!tmpl || !crypto_tmpl_get(tmpl)) |
| | 120 | return; |
| | 121 | |
| | 122 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg); |
| | 123 | list_move(&inst->alg.cra_list, list); |
| | 124 | hlist_del(&inst->list); |
| | 125 | inst->alg.cra_destroy = crypto_destroy_instance; |
| | 126 | |
| | 127 | BUG_ON(!list_empty(&inst->alg.cra_users)); |
| | 128 | } |
| | 129 | |
| | 130 | void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list, |
| | 131 | struct crypto_alg *nalg) |
| | 132 | { |
| | 133 | u32 new_type = (nalg ?: alg)->cra_flags; |
| | 134 | struct crypto_spawn *spawn, *n; |
| | 135 | LIST_HEAD(secondary_spawns); |
| | 136 | struct list_head *spawns; |
| | 137 | LIST_HEAD(stack); |
| | 138 | LIST_HEAD(top); |
| | 139 | |
| | 140 | spawns = &alg->cra_users; |
| | 141 | list_for_each_entry_safe(spawn, n, spawns, list) { |
| | 142 | if ((spawn->alg->cra_flags ^ new_type) & spawn->mask) |
| | 143 | continue; |
| | 144 | |
| | 145 | list_move(&spawn->list, &top); |
| | 146 | } |
| | 147 | |
| | 148 | spawns = ⊤ |
| | 149 | do { |
| | 150 | while (!list_empty(spawns)) { |
| | 151 | struct crypto_instance *inst; |
| | 152 | |
| | 153 | spawn = list_first_entry(spawns, struct crypto_spawn, |
| | 154 | list); |
| | 155 | inst = spawn->inst; |
| | 156 | |
| | 157 | BUG_ON(&inst->alg == alg); |
| | 158 | |
| | 159 | list_move(&spawn->list, &stack); |
| | 160 | |
| | 161 | if (&inst->alg == nalg) |
| | 162 | break; |
| | 163 | |
| | 164 | spawn->alg = NULL; |
| | 165 | spawns = &inst->alg.cra_users; |
| | 166 | } |
| | 167 | } while ((spawns = crypto_more_spawns(alg, &stack, &top, |
| | 168 | &secondary_spawns))); |
| | 169 | |
| | 170 | list_for_each_entry_safe(spawn, n, &secondary_spawns, list) { |
| | 171 | if (spawn->alg) |
| | 172 | list_move(&spawn->list, &spawn->alg->cra_users); |
| | 173 | else |
| | 174 | crypto_remove_spawn(spawn, list); |
| | 175 | } |
| | 176 | } |
| | 177 | EXPORT_SYMBOL_GPL(crypto_remove_spawns); |
| | 178 | |
| | 179 | static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg) |
| | 180 | { |
| | 181 | struct crypto_alg *q; |
| | 182 | struct crypto_larval *larval; |
| | 183 | int ret = -EAGAIN; |
| | 184 | |
| | 185 | if (crypto_is_dead(alg)) |
| | 186 | goto err; |
| | 187 | |
| | 188 | INIT_LIST_HEAD(&alg->cra_users); |
| | 189 | |
| | 190 | /* No cheating! */ |
| | 191 | alg->cra_flags &= ~CRYPTO_ALG_TESTED; |
| | 192 | |
| | 193 | ret = -EEXIST; |
| | 194 | |
| | 195 | atomic_set(&alg->cra_refcnt, 1); |
| | 196 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
| | 197 | if (q == alg) |
| | 198 | goto err; |
| | 199 | |
| | 200 | if (crypto_is_moribund(q)) |
| | 201 | continue; |
| | 202 | |
| | 203 | if (crypto_is_larval(q)) { |
| | 204 | if (!strcmp(alg->cra_driver_name, q->cra_driver_name)) |
| | 205 | goto err; |
| | 206 | continue; |
| | 207 | } |
| | 208 | |
| | 209 | if (!strcmp(q->cra_driver_name, alg->cra_name) || |
| | 210 | !strcmp(q->cra_name, alg->cra_driver_name)) |
| | 211 | goto err; |
| | 212 | } |
| | 213 | |
| | 214 | larval = crypto_larval_alloc(alg->cra_name, |
| | 215 | alg->cra_flags | CRYPTO_ALG_TESTED, 0); |
| | 216 | if (IS_ERR(larval)) |
| | 217 | goto out; |
| | 218 | |
| | 219 | ret = -ENOENT; |
| | 220 | larval->adult = crypto_mod_get(alg); |
| | 221 | if (!larval->adult) |
| | 222 | goto free_larval; |
| | 223 | |
| | 224 | atomic_set(&larval->alg.cra_refcnt, 1); |
| | 225 | memcpy(larval->alg.cra_driver_name, alg->cra_driver_name, |
| | 226 | CRYPTO_MAX_ALG_NAME); |
| | 227 | larval->alg.cra_priority = alg->cra_priority; |
| | 228 | |
| | 229 | list_add(&alg->cra_list, &crypto_alg_list); |
| | 230 | list_add(&larval->alg.cra_list, &crypto_alg_list); |
| | 231 | |
| | 232 | out: |
| | 233 | return larval; |
| | 234 | |
| | 235 | free_larval: |
| | 236 | kfree(larval); |
| | 237 | err: |
| | 238 | larval = ERR_PTR(ret); |
| | 239 | goto out; |
| | 240 | } |
| | 241 | |
| | 242 | void crypto_alg_tested(const char *name, int err) |
| | 243 | { |
| | 244 | struct crypto_larval *test; |
| | 245 | struct crypto_alg *alg; |
| | 246 | struct crypto_alg *q; |
| | 247 | LIST_HEAD(list); |
| | 248 | |
| | 249 | down_write(&crypto_alg_sem); |
| | 250 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
| | 251 | if (crypto_is_moribund(q) || !crypto_is_larval(q)) |
| | 252 | continue; |
| | 253 | |
| | 254 | test = (struct crypto_larval *)q; |
| | 255 | |
| | 256 | if (!strcmp(q->cra_driver_name, name)) |
| | 257 | goto found; |
| | 258 | } |
| | 259 | |
| | 260 | printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err); |
| | 261 | goto unlock; |
| | 262 | |
| | 263 | found: |
| | 264 | q->cra_flags |= CRYPTO_ALG_DEAD; |
| | 265 | alg = test->adult; |
| | 266 | if (err || list_empty(&alg->cra_list)) |
| | 267 | goto complete; |
| | 268 | |
| | 269 | alg->cra_flags |= CRYPTO_ALG_TESTED; |
| | 270 | |
| | 271 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
| | 272 | if (q == alg) |
| | 273 | continue; |
| | 274 | |
| | 275 | if (crypto_is_moribund(q)) |
| | 276 | continue; |
| | 277 | |
| | 278 | if (crypto_is_larval(q)) { |
| | 279 | struct crypto_larval *larval = (void *)q; |
| | 280 | |
| | 281 | /* |
| | 282 | * Check to see if either our generic name or |
| | 283 | * specific name can satisfy the name requested |
| | 284 | * by the larval entry q. |
| | 285 | */ |
| | 286 | if (strcmp(alg->cra_name, q->cra_name) && |
| | 287 | strcmp(alg->cra_driver_name, q->cra_name)) |
| | 288 | continue; |
| | 289 | |
| | 290 | if (larval->adult) |
| | 291 | continue; |
| | 292 | if ((q->cra_flags ^ alg->cra_flags) & larval->mask) |
| | 293 | continue; |
| | 294 | if (!crypto_mod_get(alg)) |
| | 295 | continue; |
| | 296 | |
| | 297 | larval->adult = alg; |
| | 298 | complete_all(&larval->completion); |
| | 299 | continue; |
| | 300 | } |
| | 301 | |
| | 302 | if (strcmp(alg->cra_name, q->cra_name)) |
| | 303 | continue; |
| | 304 | |
| | 305 | if (strcmp(alg->cra_driver_name, q->cra_driver_name) && |
| | 306 | q->cra_priority > alg->cra_priority) |
| | 307 | continue; |
| | 308 | |
| | 309 | crypto_remove_spawns(q, &list, alg); |
| | 310 | } |
| | 311 | |
| | 312 | complete: |
| | 313 | complete_all(&test->completion); |
| | 314 | |
| | 315 | unlock: |
| | 316 | up_write(&crypto_alg_sem); |
| | 317 | |
| | 318 | crypto_remove_final(&list); |
| | 319 | } |
| | 320 | EXPORT_SYMBOL_GPL(crypto_alg_tested); |
| | 321 | |
| | 322 | void crypto_remove_final(struct list_head *list) |
| | 323 | { |
| | 324 | struct crypto_alg *alg; |
| | 325 | struct crypto_alg *n; |
| | 326 | |
| | 327 | list_for_each_entry_safe(alg, n, list, cra_list) { |
| | 328 | list_del_init(&alg->cra_list); |
| | 329 | crypto_alg_put(alg); |
| | 330 | } |
| | 331 | } |
| | 332 | EXPORT_SYMBOL_GPL(crypto_remove_final); |
| | 333 | |
| | 334 | static void crypto_wait_for_test(struct crypto_larval *larval) |
| | 335 | { |
| | 336 | int err; |
| | 337 | |
| | 338 | err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult); |
| | 339 | if (err != NOTIFY_STOP) { |
| | 340 | if (WARN_ON(err != NOTIFY_DONE)) |
| | 341 | goto out; |
| | 342 | crypto_alg_tested(larval->alg.cra_driver_name, 0); |
| | 343 | } |
| | 344 | |
| | 345 | err = wait_for_completion_interruptible(&larval->completion); |
| | 346 | WARN_ON(err); |
| | 347 | |
| | 348 | out: |
| | 349 | crypto_larval_kill(&larval->alg); |
| | 350 | } |
| | 351 | |
| | 352 | int crypto_register_alg(struct crypto_alg *alg) |
| | 353 | { |
| | 354 | struct crypto_larval *larval; |
| | 355 | int err; |
| | 356 | |
| | 357 | err = crypto_check_alg(alg); |
| | 358 | if (err) |
| | 359 | return err; |
| | 360 | |
| | 361 | down_write(&crypto_alg_sem); |
| | 362 | larval = __crypto_register_alg(alg); |
| | 363 | up_write(&crypto_alg_sem); |
| | 364 | |
| | 365 | if (IS_ERR(larval)) |
| | 366 | return PTR_ERR(larval); |
| | 367 | |
| | 368 | crypto_wait_for_test(larval); |
| | 369 | return 0; |
| | 370 | } |
| | 371 | EXPORT_SYMBOL_GPL(crypto_register_alg); |
| | 372 | |
| | 373 | static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list) |
| | 374 | { |
| | 375 | if (unlikely(list_empty(&alg->cra_list))) |
| | 376 | return -ENOENT; |
| | 377 | |
| | 378 | alg->cra_flags |= CRYPTO_ALG_DEAD; |
| | 379 | |
| | 380 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg); |
| | 381 | list_del_init(&alg->cra_list); |
| | 382 | crypto_remove_spawns(alg, list, NULL); |
| | 383 | |
| | 384 | return 0; |
| | 385 | } |
| | 386 | |
| | 387 | int crypto_unregister_alg(struct crypto_alg *alg) |
| | 388 | { |
| | 389 | int ret; |
| | 390 | LIST_HEAD(list); |
| | 391 | |
| | 392 | down_write(&crypto_alg_sem); |
| | 393 | ret = crypto_remove_alg(alg, &list); |
| | 394 | up_write(&crypto_alg_sem); |
| | 395 | |
| | 396 | if (ret) |
| | 397 | return ret; |
| | 398 | |
| | 399 | BUG_ON(atomic_read(&alg->cra_refcnt) != 1); |
| | 400 | if (alg->cra_destroy) |
| | 401 | alg->cra_destroy(alg); |
| | 402 | |
| | 403 | crypto_remove_final(&list); |
| | 404 | return 0; |
| | 405 | } |
| | 406 | EXPORT_SYMBOL_GPL(crypto_unregister_alg); |
| | 407 | |
| | 408 | int crypto_register_template(struct crypto_template *tmpl) |
| | 409 | { |
| | 410 | struct crypto_template *q; |
| | 411 | int err = -EEXIST; |
| | 412 | |
| | 413 | down_write(&crypto_alg_sem); |
| | 414 | |
| | 415 | list_for_each_entry(q, &crypto_template_list, list) { |
| | 416 | if (q == tmpl) |
| | 417 | goto out; |
| | 418 | } |
| | 419 | |
| | 420 | list_add(&tmpl->list, &crypto_template_list); |
| | 421 | crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl); |
| | 422 | err = 0; |
| | 423 | out: |
| | 424 | up_write(&crypto_alg_sem); |
| | 425 | return err; |
| | 426 | } |
| | 427 | EXPORT_SYMBOL_GPL(crypto_register_template); |
| | 428 | |
| | 429 | void crypto_unregister_template(struct crypto_template *tmpl) |
| | 430 | { |
| | 431 | struct crypto_instance *inst; |
| | 432 | struct hlist_node *p, *n; |
| | 433 | struct hlist_head *list; |
| | 434 | LIST_HEAD(users); |
| | 435 | |
| | 436 | down_write(&crypto_alg_sem); |
| | 437 | |
| | 438 | BUG_ON(list_empty(&tmpl->list)); |
| | 439 | list_del_init(&tmpl->list); |
| | 440 | |
| | 441 | list = &tmpl->instances; |
| | 442 | hlist_for_each_entry(inst, p, list, list) { |
| | 443 | int err = crypto_remove_alg(&inst->alg, &users); |
| | 444 | BUG_ON(err); |
| | 445 | } |
| | 446 | |
| | 447 | crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl); |
| | 448 | |
| | 449 | up_write(&crypto_alg_sem); |
| | 450 | |
| | 451 | hlist_for_each_entry_safe(inst, p, n, list, list) { |
| | 452 | BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); |
| | 453 | tmpl->free(inst); |
| | 454 | } |
| | 455 | crypto_remove_final(&users); |
| | 456 | } |
| | 457 | EXPORT_SYMBOL_GPL(crypto_unregister_template); |
| | 458 | |
| | 459 | static struct crypto_template *__crypto_lookup_template(const char *name) |
| | 460 | { |
| | 461 | struct crypto_template *q, *tmpl = NULL; |
| | 462 | |
| | 463 | down_read(&crypto_alg_sem); |
| | 464 | list_for_each_entry(q, &crypto_template_list, list) { |
| | 465 | if (strcmp(q->name, name)) |
| | 466 | continue; |
| | 467 | if (unlikely(!crypto_tmpl_get(q))) |
| | 468 | continue; |
| | 469 | |
| | 470 | tmpl = q; |
| | 471 | break; |
| | 472 | } |
| | 473 | up_read(&crypto_alg_sem); |
| | 474 | |
| | 475 | return tmpl; |
| | 476 | } |
| | 477 | |
| | 478 | struct crypto_template *crypto_lookup_template(const char *name) |
| | 479 | { |
| | 480 | return try_then_request_module(__crypto_lookup_template(name), name); |
| | 481 | } |
| | 482 | EXPORT_SYMBOL_GPL(crypto_lookup_template); |
| | 483 | |
| | 484 | int crypto_register_instance(struct crypto_template *tmpl, |
| | 485 | struct crypto_instance *inst) |
| | 486 | { |
| | 487 | struct crypto_larval *larval; |
| | 488 | int err; |
| | 489 | |
| | 490 | err = crypto_check_alg(&inst->alg); |
| | 491 | if (err) |
| | 492 | goto err; |
| | 493 | |
| | 494 | inst->alg.cra_module = tmpl->module; |
| | 495 | inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE; |
| | 496 | |
| | 497 | down_write(&crypto_alg_sem); |
| | 498 | |
| | 499 | larval = __crypto_register_alg(&inst->alg); |
| | 500 | if (IS_ERR(larval)) |
| | 501 | goto unlock; |
| | 502 | |
| | 503 | hlist_add_head(&inst->list, &tmpl->instances); |
| | 504 | inst->tmpl = tmpl; |
| | 505 | |
| | 506 | unlock: |
| | 507 | up_write(&crypto_alg_sem); |
| | 508 | |
| | 509 | err = PTR_ERR(larval); |
| | 510 | if (IS_ERR(larval)) |
| | 511 | goto err; |
| | 512 | |
| | 513 | crypto_wait_for_test(larval); |
| | 514 | err = 0; |
| | 515 | |
| | 516 | err: |
| | 517 | return err; |
| | 518 | } |
| | 519 | EXPORT_SYMBOL_GPL(crypto_register_instance); |
| | 520 | |
| | 521 | int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, |
| | 522 | struct crypto_instance *inst, u32 mask) |
| | 523 | { |
| | 524 | int err = -EAGAIN; |
| | 525 | |
| | 526 | spawn->inst = inst; |
| | 527 | spawn->mask = mask; |
| | 528 | |
| | 529 | down_write(&crypto_alg_sem); |
| | 530 | if (!crypto_is_moribund(alg)) { |
| | 531 | list_add(&spawn->list, &alg->cra_users); |
| | 532 | spawn->alg = alg; |
| | 533 | err = 0; |
| | 534 | } |
| | 535 | up_write(&crypto_alg_sem); |
| | 536 | |
| | 537 | return err; |
| | 538 | } |
| | 539 | EXPORT_SYMBOL_GPL(crypto_init_spawn); |
| | 540 | |
| | 541 | int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg, |
| | 542 | struct crypto_instance *inst, |
| | 543 | const struct crypto_type *frontend) |
| | 544 | { |
| | 545 | int err = -EINVAL; |
| | 546 | |
| | 547 | if ((alg->cra_flags ^ frontend->type) & frontend->maskset) |
| | 548 | goto out; |
| | 549 | |
| | 550 | spawn->frontend = frontend; |
| | 551 | err = crypto_init_spawn(spawn, alg, inst, frontend->maskset); |
| | 552 | |
| | 553 | out: |
| | 554 | return err; |
| | 555 | } |
| | 556 | EXPORT_SYMBOL_GPL(crypto_init_spawn2); |
| | 557 | |
| | 558 | void crypto_drop_spawn(struct crypto_spawn *spawn) |
| | 559 | { |
| | 560 | if (!spawn->alg) |
| | 561 | return; |
| | 562 | |
| | 563 | down_write(&crypto_alg_sem); |
| | 564 | list_del(&spawn->list); |
| | 565 | up_write(&crypto_alg_sem); |
| | 566 | } |
| | 567 | EXPORT_SYMBOL_GPL(crypto_drop_spawn); |
| | 568 | |
| | 569 | static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn) |
| | 570 | { |
| | 571 | struct crypto_alg *alg; |
| | 572 | struct crypto_alg *alg2; |
| | 573 | |
| | 574 | down_read(&crypto_alg_sem); |
| | 575 | alg = spawn->alg; |
| | 576 | alg2 = alg; |
| | 577 | if (alg2) |
| | 578 | alg2 = crypto_mod_get(alg2); |
| | 579 | up_read(&crypto_alg_sem); |
| | 580 | |
| | 581 | if (!alg2) { |
| | 582 | if (alg) |
| | 583 | crypto_shoot_alg(alg); |
| | 584 | return ERR_PTR(-EAGAIN); |
| | 585 | } |
| | 586 | |
| | 587 | return alg; |
| | 588 | } |
| | 589 | |
| | 590 | struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, |
| | 591 | u32 mask) |
| | 592 | { |
| | 593 | struct crypto_alg *alg; |
| | 594 | struct crypto_tfm *tfm; |
| | 595 | |
| | 596 | alg = crypto_spawn_alg(spawn); |
| | 597 | if (IS_ERR(alg)) |
| | 598 | return ERR_CAST(alg); |
| | 599 | |
| | 600 | tfm = ERR_PTR(-EINVAL); |
| | 601 | if (unlikely((alg->cra_flags ^ type) & mask)) |
| | 602 | goto out_put_alg; |
| | 603 | |
| | 604 | tfm = __crypto_alloc_tfm(alg, type, mask); |
| | 605 | if (IS_ERR(tfm)) |
| | 606 | goto out_put_alg; |
| | 607 | |
| | 608 | return tfm; |
| | 609 | |
| | 610 | out_put_alg: |
| | 611 | crypto_mod_put(alg); |
| | 612 | return tfm; |
| | 613 | } |
| | 614 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm); |
| | 615 | |
| | 616 | void *crypto_spawn_tfm2(struct crypto_spawn *spawn) |
| | 617 | { |
| | 618 | struct crypto_alg *alg; |
| | 619 | struct crypto_tfm *tfm; |
| | 620 | |
| | 621 | alg = crypto_spawn_alg(spawn); |
| | 622 | if (IS_ERR(alg)) |
| | 623 | return ERR_CAST(alg); |
| | 624 | |
| | 625 | tfm = crypto_create_tfm(alg, spawn->frontend); |
| | 626 | if (IS_ERR(tfm)) |
| | 627 | goto out_put_alg; |
| | 628 | |
| | 629 | return tfm; |
| | 630 | |
| | 631 | out_put_alg: |
| | 632 | crypto_mod_put(alg); |
| | 633 | return tfm; |
| | 634 | } |
| | 635 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); |
| | 636 | |
| | 637 | int crypto_register_notifier(struct notifier_block *nb) |
| | 638 | { |
| | 639 | return blocking_notifier_chain_register(&crypto_chain, nb); |
| | 640 | } |
| | 641 | EXPORT_SYMBOL_GPL(crypto_register_notifier); |
| | 642 | |
| | 643 | int crypto_unregister_notifier(struct notifier_block *nb) |
| | 644 | { |
| | 645 | return blocking_notifier_chain_unregister(&crypto_chain, nb); |
| | 646 | } |
| | 647 | EXPORT_SYMBOL_GPL(crypto_unregister_notifier); |
| | 648 | |
| | 649 | struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) |
| | 650 | { |
| | 651 | struct rtattr *rta = tb[0]; |
| | 652 | struct crypto_attr_type *algt; |
| | 653 | |
| | 654 | if (!rta) |
| | 655 | return ERR_PTR(-ENOENT); |
| | 656 | if (RTA_PAYLOAD(rta) < sizeof(*algt)) |
| | 657 | return ERR_PTR(-EINVAL); |
| | 658 | if (rta->rta_type != CRYPTOA_TYPE) |
| | 659 | return ERR_PTR(-EINVAL); |
| | 660 | |
| | 661 | algt = RTA_DATA(rta); |
| | 662 | |
| | 663 | return algt; |
| | 664 | } |
| | 665 | EXPORT_SYMBOL_GPL(crypto_get_attr_type); |
| | 666 | |
| | 667 | int crypto_check_attr_type(struct rtattr **tb, u32 type) |
| | 668 | { |
| | 669 | struct crypto_attr_type *algt; |
| | 670 | |
| | 671 | algt = crypto_get_attr_type(tb); |
| | 672 | if (IS_ERR(algt)) |
| | 673 | return PTR_ERR(algt); |
| | 674 | |
| | 675 | if ((algt->type ^ type) & algt->mask) |
| | 676 | return -EINVAL; |
| | 677 | |
| | 678 | return 0; |
| | 679 | } |
| | 680 | EXPORT_SYMBOL_GPL(crypto_check_attr_type); |
| | 681 | |
| | 682 | const char *crypto_attr_alg_name(struct rtattr *rta) |
| | 683 | { |
| | 684 | struct crypto_attr_alg *alga; |
| | 685 | |
| | 686 | if (!rta) |
| | 687 | return ERR_PTR(-ENOENT); |
| | 688 | if (RTA_PAYLOAD(rta) < sizeof(*alga)) |
| | 689 | return ERR_PTR(-EINVAL); |
| | 690 | if (rta->rta_type != CRYPTOA_ALG) |
| | 691 | return ERR_PTR(-EINVAL); |
| | 692 | |
| | 693 | alga = RTA_DATA(rta); |
| | 694 | alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; |
| | 695 | |
| | 696 | return alga->name; |
| | 697 | } |
| | 698 | EXPORT_SYMBOL_GPL(crypto_attr_alg_name); |
| | 699 | |
| | 700 | struct crypto_alg *crypto_attr_alg2(struct rtattr *rta, |
| | 701 | const struct crypto_type *frontend, |
| | 702 | u32 type, u32 mask) |
| | 703 | { |
| | 704 | const char *name; |
| | 705 | int err; |
| | 706 | |
| | 707 | name = crypto_attr_alg_name(rta); |
| | 708 | err = PTR_ERR(name); |
| | 709 | if (IS_ERR(name)) |
| | 710 | return ERR_PTR(err); |
| | 711 | |
| | 712 | return crypto_find_alg(name, frontend, type, mask); |
| | 713 | } |
| | 714 | EXPORT_SYMBOL_GPL(crypto_attr_alg2); |
| | 715 | |
| | 716 | int crypto_attr_u32(struct rtattr *rta, u32 *num) |
| | 717 | { |
| | 718 | struct crypto_attr_u32 *nu32; |
| | 719 | |
| | 720 | if (!rta) |
| | 721 | return -ENOENT; |
| | 722 | if (RTA_PAYLOAD(rta) < sizeof(*nu32)) |
| | 723 | return -EINVAL; |
| | 724 | if (rta->rta_type != CRYPTOA_U32) |
| | 725 | return -EINVAL; |
| | 726 | |
| | 727 | nu32 = RTA_DATA(rta); |
| | 728 | *num = nu32->num; |
| | 729 | |
| | 730 | return 0; |
| | 731 | } |
| | 732 | EXPORT_SYMBOL_GPL(crypto_attr_u32); |
| | 733 | |
| | 734 | void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg, |
| | 735 | unsigned int head) |
| | 736 | { |
| | 737 | struct crypto_instance *inst; |
| | 738 | char *p; |
| | 739 | int err; |
| | 740 | |
| | 741 | p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn), |
| | 742 | GFP_KERNEL); |
| | 743 | if (!p) |
| | 744 | return ERR_PTR(-ENOMEM); |
| | 745 | |
| | 746 | inst = (void *)(p + head); |
| | 747 | |
| | 748 | err = -ENAMETOOLONG; |
| | 749 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, |
| | 750 | alg->cra_name) >= CRYPTO_MAX_ALG_NAME) |
| | 751 | goto err_free_inst; |
| | 752 | |
| | 753 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", |
| | 754 | name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
| | 755 | goto err_free_inst; |
| | 756 | |
| | 757 | return p; |
| | 758 | |
| | 759 | err_free_inst: |
| | 760 | kfree(p); |
| | 761 | return ERR_PTR(err); |
| | 762 | } |
| | 763 | EXPORT_SYMBOL_GPL(crypto_alloc_instance2); |
| | 764 | |
| | 765 | struct crypto_instance *crypto_alloc_instance(const char *name, |
| | 766 | struct crypto_alg *alg) |
| | 767 | { |
| | 768 | struct crypto_instance *inst; |
| | 769 | struct crypto_spawn *spawn; |
| | 770 | int err; |
| | 771 | |
| | 772 | inst = crypto_alloc_instance2(name, alg, 0); |
| | 773 | if (IS_ERR(inst)) |
| | 774 | goto out; |
| | 775 | |
| | 776 | spawn = crypto_instance_ctx(inst); |
| | 777 | err = crypto_init_spawn(spawn, alg, inst, |
| | 778 | CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); |
| | 779 | |
| | 780 | if (err) |
| | 781 | goto err_free_inst; |
| | 782 | |
| | 783 | return inst; |
| | 784 | |
| | 785 | err_free_inst: |
| | 786 | kfree(inst); |
| | 787 | inst = ERR_PTR(err); |
| | 788 | |
| | 789 | out: |
| | 790 | return inst; |
| | 791 | } |
| | 792 | EXPORT_SYMBOL_GPL(crypto_alloc_instance); |
| | 793 | |
| | 794 | void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) |
| | 795 | { |
| | 796 | INIT_LIST_HEAD(&queue->list); |
| | 797 | queue->backlog = &queue->list; |
| | 798 | queue->qlen = 0; |
| | 799 | queue->max_qlen = max_qlen; |
| | 800 | } |
| | 801 | EXPORT_SYMBOL_GPL(crypto_init_queue); |
| | 802 | |
| | 803 | int crypto_enqueue_request(struct crypto_queue *queue, |
| | 804 | struct crypto_async_request *request) |
| | 805 | { |
| | 806 | int err = -EINPROGRESS; |
| | 807 | |
| | 808 | if (unlikely(queue->qlen >= queue->max_qlen)) { |
| | 809 | err = -EBUSY; |
| | 810 | if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) |
| | 811 | goto out; |
| | 812 | if (queue->backlog == &queue->list) |
| | 813 | queue->backlog = &request->list; |
| | 814 | } |
| | 815 | |
| | 816 | queue->qlen++; |
| | 817 | list_add_tail(&request->list, &queue->list); |
| | 818 | |
| | 819 | out: |
| | 820 | return err; |
| | 821 | } |
| | 822 | EXPORT_SYMBOL_GPL(crypto_enqueue_request); |
| | 823 | |
| | 824 | void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset) |
| | 825 | { |
| | 826 | struct list_head *request; |
| | 827 | |
| | 828 | if (unlikely(!queue->qlen)) |
| | 829 | return NULL; |
| | 830 | |
| | 831 | queue->qlen--; |
| | 832 | |
| | 833 | if (queue->backlog != &queue->list) |
| | 834 | queue->backlog = queue->backlog->next; |
| | 835 | |
| | 836 | request = queue->list.next; |
| | 837 | list_del(request); |
| | 838 | |
| | 839 | return (char *)list_entry(request, struct crypto_async_request, list) - |
| | 840 | offset; |
| | 841 | } |
| | 842 | EXPORT_SYMBOL_GPL(__crypto_dequeue_request); |
| | 843 | |
| | 844 | struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) |
| | 845 | { |
| | 846 | return __crypto_dequeue_request(queue, 0); |
| | 847 | } |
| | 848 | EXPORT_SYMBOL_GPL(crypto_dequeue_request); |
| | 849 | |
| | 850 | int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) |
| | 851 | { |
| | 852 | struct crypto_async_request *req; |
| | 853 | |
| | 854 | list_for_each_entry(req, &queue->list, list) { |
| | 855 | if (req->tfm == tfm) |
| | 856 | return 1; |
| | 857 | } |
| | 858 | |
| | 859 | return 0; |
| | 860 | } |
| | 861 | EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); |
| | 862 | |
| | 863 | static inline void crypto_inc_byte(u8 *a, unsigned int size) |
| | 864 | { |
| | 865 | u8 *b = (a + size); |
| | 866 | u8 c; |
| | 867 | |
| | 868 | for (; size; size--) { |
| | 869 | c = *--b + 1; |
| | 870 | *b = c; |
| | 871 | if (c) |
| | 872 | break; |
| | 873 | } |
| | 874 | } |
| | 875 | |
| | 876 | void crypto_inc(u8 *a, unsigned int size) |
| | 877 | { |
| | 878 | __be32 *b = (__be32 *)(a + size); |
| | 879 | u32 c; |
| | 880 | |
| | 881 | for (; size >= 4; size -= 4) { |
| | 882 | c = be32_to_cpu(*--b) + 1; |
| | 883 | *b = cpu_to_be32(c); |
| | 884 | if (c) |
| | 885 | return; |
| | 886 | } |
| | 887 | |
| | 888 | crypto_inc_byte(a, size); |
| | 889 | } |
| | 890 | EXPORT_SYMBOL_GPL(crypto_inc); |
| | 891 | |
| | 892 | static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size) |
| | 893 | { |
| | 894 | for (; size; size--) |
| | 895 | *a++ ^= *b++; |
| | 896 | } |
| | 897 | |
| | 898 | void crypto_xor(u8 *dst, const u8 *src, unsigned int size) |
| | 899 | { |
| | 900 | u32 *a = (u32 *)dst; |
| | 901 | u32 *b = (u32 *)src; |
| | 902 | |
| | 903 | for (; size >= 4; size -= 4) |
| | 904 | *a++ ^= *b++; |
| | 905 | |
| | 906 | crypto_xor_byte((u8 *)a, (u8 *)b, size); |
| | 907 | } |
| | 908 | EXPORT_SYMBOL_GPL(crypto_xor); |
| | 909 | |
| | 910 | static int __init crypto_algapi_init(void) |
| | 911 | { |
| | 912 | crypto_init_proc(); |
| | 913 | return 0; |
| | 914 | } |
| | 915 | |
| | 916 | static void __exit crypto_algapi_exit(void) |
| | 917 | { |
| | 918 | crypto_exit_proc(); |
| | 919 | } |
| | 920 | |
| | 921 | module_init(crypto_algapi_init); |
| | 922 | module_exit(crypto_algapi_exit); |
| | 923 | |
| | 924 | MODULE_LICENSE("GPL"); |
| | 925 | MODULE_DESCRIPTION("Cryptographic algorithms API"); |
projects / deliverable / linux.git / blame_incremental