Evgeniy Polyakov | e2396ae | 2009-02-09 17:02:36 +0300 | [diff] [blame] | 1 | /* |
| 2 | * 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net> |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/crypto.h> |
| 17 | #include <linux/highmem.h> |
| 18 | #include <linux/kthread.h> |
| 19 | #include <linux/pagemap.h> |
| 20 | #include <linux/slab.h> |
| 21 | |
| 22 | #include "netfs.h" |
| 23 | |
| 24 | static struct crypto_hash *pohmelfs_init_hash(struct pohmelfs_sb *psb) |
| 25 | { |
| 26 | int err; |
| 27 | struct crypto_hash *hash; |
| 28 | |
| 29 | hash = crypto_alloc_hash(psb->hash_string, 0, CRYPTO_ALG_ASYNC); |
| 30 | if (IS_ERR(hash)) { |
| 31 | err = PTR_ERR(hash); |
| 32 | dprintk("%s: idx: %u: failed to allocate hash '%s', err: %d.\n", |
| 33 | __func__, psb->idx, psb->hash_string, err); |
| 34 | goto err_out_exit; |
| 35 | } |
| 36 | |
| 37 | psb->crypto_attached_size = crypto_hash_digestsize(hash); |
| 38 | |
| 39 | if (!psb->hash_keysize) |
| 40 | return hash; |
| 41 | |
| 42 | err = crypto_hash_setkey(hash, psb->hash_key, psb->hash_keysize); |
| 43 | if (err) { |
| 44 | dprintk("%s: idx: %u: failed to set key for hash '%s', err: %d.\n", |
| 45 | __func__, psb->idx, psb->hash_string, err); |
| 46 | goto err_out_free; |
| 47 | } |
| 48 | |
| 49 | return hash; |
| 50 | |
| 51 | err_out_free: |
| 52 | crypto_free_hash(hash); |
| 53 | err_out_exit: |
| 54 | return ERR_PTR(err); |
| 55 | } |
| 56 | |
| 57 | static struct crypto_ablkcipher *pohmelfs_init_cipher(struct pohmelfs_sb *psb) |
| 58 | { |
| 59 | int err = -EINVAL; |
| 60 | struct crypto_ablkcipher *cipher; |
| 61 | |
| 62 | if (!psb->cipher_keysize) |
| 63 | goto err_out_exit; |
| 64 | |
| 65 | cipher = crypto_alloc_ablkcipher(psb->cipher_string, 0, 0); |
| 66 | if (IS_ERR(cipher)) { |
| 67 | err = PTR_ERR(cipher); |
| 68 | dprintk("%s: idx: %u: failed to allocate cipher '%s', err: %d.\n", |
| 69 | __func__, psb->idx, psb->cipher_string, err); |
| 70 | goto err_out_exit; |
| 71 | } |
| 72 | |
| 73 | crypto_ablkcipher_clear_flags(cipher, ~0); |
| 74 | |
| 75 | err = crypto_ablkcipher_setkey(cipher, psb->cipher_key, psb->cipher_keysize); |
| 76 | if (err) { |
| 77 | dprintk("%s: idx: %u: failed to set key for cipher '%s', err: %d.\n", |
| 78 | __func__, psb->idx, psb->cipher_string, err); |
| 79 | goto err_out_free; |
| 80 | } |
| 81 | |
| 82 | return cipher; |
| 83 | |
| 84 | err_out_free: |
| 85 | crypto_free_ablkcipher(cipher); |
| 86 | err_out_exit: |
| 87 | return ERR_PTR(err); |
| 88 | } |
| 89 | |
| 90 | int pohmelfs_crypto_engine_init(struct pohmelfs_crypto_engine *e, struct pohmelfs_sb *psb) |
| 91 | { |
| 92 | int err; |
| 93 | |
| 94 | e->page_num = 0; |
| 95 | |
| 96 | e->size = PAGE_SIZE; |
| 97 | e->data = kmalloc(e->size, GFP_KERNEL); |
| 98 | if (!e->data) { |
| 99 | err = -ENOMEM; |
| 100 | goto err_out_exit; |
| 101 | } |
| 102 | |
| 103 | if (psb->hash_string) { |
| 104 | e->hash = pohmelfs_init_hash(psb); |
| 105 | if (IS_ERR(e->hash)) { |
| 106 | err = PTR_ERR(e->hash); |
| 107 | e->hash = NULL; |
| 108 | goto err_out_free; |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | if (psb->cipher_string) { |
| 113 | e->cipher = pohmelfs_init_cipher(psb); |
| 114 | if (IS_ERR(e->cipher)) { |
| 115 | err = PTR_ERR(e->cipher); |
| 116 | e->cipher = NULL; |
| 117 | goto err_out_free_hash; |
| 118 | } |
| 119 | } |
| 120 | |
| 121 | return 0; |
| 122 | |
| 123 | err_out_free_hash: |
| 124 | crypto_free_hash(e->hash); |
| 125 | err_out_free: |
| 126 | kfree(e->data); |
| 127 | err_out_exit: |
| 128 | return err; |
| 129 | } |
| 130 | |
| 131 | void pohmelfs_crypto_engine_exit(struct pohmelfs_crypto_engine *e) |
| 132 | { |
| 133 | if (e->hash) |
| 134 | crypto_free_hash(e->hash); |
| 135 | if (e->cipher) |
| 136 | crypto_free_ablkcipher(e->cipher); |
| 137 | kfree(e->data); |
| 138 | } |
| 139 | |
| 140 | static void pohmelfs_crypto_complete(struct crypto_async_request *req, int err) |
| 141 | { |
| 142 | struct pohmelfs_crypto_completion *c = req->data; |
| 143 | |
| 144 | if (err == -EINPROGRESS) |
| 145 | return; |
| 146 | |
| 147 | dprintk("%s: req: %p, err: %d.\n", __func__, req, err); |
| 148 | c->error = err; |
| 149 | complete(&c->complete); |
| 150 | } |
| 151 | |
| 152 | static int pohmelfs_crypto_process(struct ablkcipher_request *req, |
| 153 | struct scatterlist *sg_dst, struct scatterlist *sg_src, |
| 154 | void *iv, int enc, unsigned long timeout) |
| 155 | { |
| 156 | struct pohmelfs_crypto_completion complete; |
| 157 | int err; |
| 158 | |
| 159 | init_completion(&complete.complete); |
| 160 | complete.error = -EINPROGRESS; |
| 161 | |
| 162 | ablkcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG, |
| 163 | pohmelfs_crypto_complete, &complete); |
| 164 | |
| 165 | ablkcipher_request_set_crypt(req, sg_src, sg_dst, sg_src->length, iv); |
| 166 | |
| 167 | if (enc) |
| 168 | err = crypto_ablkcipher_encrypt(req); |
| 169 | else |
| 170 | err = crypto_ablkcipher_decrypt(req); |
| 171 | |
| 172 | switch (err) { |
| 173 | case -EINPROGRESS: |
| 174 | case -EBUSY: |
| 175 | err = wait_for_completion_interruptible_timeout(&complete.complete, |
| 176 | timeout); |
| 177 | if (!err) |
| 178 | err = -ETIMEDOUT; |
| 179 | else |
| 180 | err = complete.error; |
| 181 | break; |
| 182 | default: |
| 183 | break; |
| 184 | } |
| 185 | |
| 186 | return err; |
| 187 | } |
| 188 | |
| 189 | int pohmelfs_crypto_process_input_data(struct pohmelfs_crypto_engine *e, u64 cmd_iv, |
| 190 | void *data, struct page *page, unsigned int size) |
| 191 | { |
| 192 | int err; |
| 193 | struct scatterlist sg; |
| 194 | |
| 195 | if (!e->cipher && !e->hash) |
| 196 | return 0; |
| 197 | |
| 198 | dprintk("%s: eng: %p, iv: %llx, data: %p, page: %p/%lu, size: %u.\n", |
| 199 | __func__, e, cmd_iv, data, page, (page)?page->index:0, size); |
| 200 | |
| 201 | if (data) { |
| 202 | sg_init_one(&sg, data, size); |
| 203 | } else { |
| 204 | sg_init_table(&sg, 1); |
| 205 | sg_set_page(&sg, page, size, 0); |
| 206 | } |
| 207 | |
| 208 | if (e->cipher) { |
| 209 | struct ablkcipher_request *req = e->data + crypto_hash_digestsize(e->hash); |
| 210 | u8 iv[32]; |
| 211 | |
| 212 | memset(iv, 0, sizeof(iv)); |
| 213 | memcpy(iv, &cmd_iv, sizeof(cmd_iv)); |
| 214 | |
| 215 | ablkcipher_request_set_tfm(req, e->cipher); |
| 216 | |
| 217 | err = pohmelfs_crypto_process(req, &sg, &sg, iv, 0, e->timeout); |
| 218 | if (err) |
| 219 | goto err_out_exit; |
| 220 | } |
| 221 | |
| 222 | if (e->hash) { |
| 223 | struct hash_desc desc; |
| 224 | void *dst = e->data + e->size/2; |
| 225 | |
| 226 | desc.tfm = e->hash; |
| 227 | desc.flags = 0; |
| 228 | |
| 229 | err = crypto_hash_init(&desc); |
| 230 | if (err) |
| 231 | goto err_out_exit; |
| 232 | |
| 233 | err = crypto_hash_update(&desc, &sg, size); |
| 234 | if (err) |
| 235 | goto err_out_exit; |
| 236 | |
| 237 | err = crypto_hash_final(&desc, dst); |
| 238 | if (err) |
| 239 | goto err_out_exit; |
| 240 | |
| 241 | err = !!memcmp(dst, e->data, crypto_hash_digestsize(e->hash)); |
| 242 | |
| 243 | if (err) { |
| 244 | #ifdef CONFIG_POHMELFS_DEBUG |
| 245 | unsigned int i; |
| 246 | unsigned char *recv = e->data, *calc = dst; |
| 247 | |
| 248 | dprintk("%s: eng: %p, hash: %p, cipher: %p: iv : %llx, hash mismatch (recv/calc): ", |
| 249 | __func__, e, e->hash, e->cipher, cmd_iv); |
| 250 | for (i=0; i<crypto_hash_digestsize(e->hash); ++i) { |
| 251 | #if 0 |
| 252 | dprintka("%02x ", recv[i]); |
| 253 | if (recv[i] != calc[i]) { |
| 254 | dprintka("| calc byte: %02x.\n", calc[i]); |
| 255 | break; |
| 256 | } |
| 257 | #else |
| 258 | dprintka("%02x/%02x ", recv[i], calc[i]); |
| 259 | #endif |
| 260 | } |
| 261 | dprintk("\n"); |
| 262 | #endif |
| 263 | goto err_out_exit; |
| 264 | } else { |
| 265 | dprintk("%s: eng: %p, hash: %p, cipher: %p: hashes matched.\n", |
| 266 | __func__, e, e->hash, e->cipher); |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | dprintk("%s: eng: %p, size: %u, hash: %p, cipher: %p: completed.\n", |
| 271 | __func__, e, e->size, e->hash, e->cipher); |
| 272 | |
| 273 | return 0; |
| 274 | |
| 275 | err_out_exit: |
| 276 | dprintk("%s: eng: %p, hash: %p, cipher: %p: err: %d.\n", |
| 277 | __func__, e, e->hash, e->cipher, err); |
| 278 | return err; |
| 279 | } |
| 280 | |
| 281 | static int pohmelfs_trans_iter(struct netfs_trans *t, struct pohmelfs_crypto_engine *e, |
| 282 | int (* iterator) (struct pohmelfs_crypto_engine *e, |
| 283 | struct scatterlist *dst, |
| 284 | struct scatterlist *src)) |
| 285 | { |
| 286 | void *data = t->iovec.iov_base + sizeof(struct netfs_cmd) + t->psb->crypto_attached_size; |
| 287 | unsigned int size = t->iovec.iov_len - sizeof(struct netfs_cmd) - t->psb->crypto_attached_size; |
| 288 | struct netfs_cmd *cmd = data; |
| 289 | unsigned int sz, pages = t->attached_pages, i, csize, cmd_cmd, dpage_idx; |
| 290 | struct scatterlist sg_src, sg_dst; |
| 291 | int err; |
| 292 | |
| 293 | while (size) { |
| 294 | cmd = data; |
| 295 | cmd_cmd = __be16_to_cpu(cmd->cmd); |
| 296 | csize = __be32_to_cpu(cmd->size); |
| 297 | cmd->iv = __cpu_to_be64(e->iv); |
| 298 | |
| 299 | if (cmd_cmd == NETFS_READ_PAGES || cmd_cmd == NETFS_READ_PAGE) |
| 300 | csize = __be16_to_cpu(cmd->ext); |
| 301 | |
| 302 | sz = csize + __be16_to_cpu(cmd->cpad) + sizeof(struct netfs_cmd); |
| 303 | |
| 304 | dprintk("%s: size: %u, sz: %u, cmd_size: %u, cmd_cpad: %u.\n", |
| 305 | __func__, size, sz, __be32_to_cpu(cmd->size), __be16_to_cpu(cmd->cpad)); |
| 306 | |
| 307 | data += sz; |
| 308 | size -= sz; |
| 309 | |
| 310 | sg_init_one(&sg_src, cmd->data, sz - sizeof(struct netfs_cmd)); |
| 311 | sg_init_one(&sg_dst, cmd->data, sz - sizeof(struct netfs_cmd)); |
| 312 | |
| 313 | err = iterator(e, &sg_dst, &sg_src); |
| 314 | if (err) |
| 315 | return err; |
| 316 | } |
| 317 | |
| 318 | if (!pages) |
| 319 | return 0; |
| 320 | |
| 321 | dpage_idx = 0; |
| 322 | for (i=0; i<t->page_num; ++i) { |
| 323 | struct page *page = t->pages[i]; |
| 324 | struct page *dpage = e->pages[dpage_idx]; |
| 325 | |
| 326 | if (!page) |
| 327 | continue; |
| 328 | |
| 329 | sg_init_table(&sg_src, 1); |
| 330 | sg_init_table(&sg_dst, 1); |
| 331 | sg_set_page(&sg_src, page, page_private(page), 0); |
| 332 | sg_set_page(&sg_dst, dpage, page_private(page), 0); |
| 333 | |
| 334 | err = iterator(e, &sg_dst, &sg_src); |
| 335 | if (err) |
| 336 | return err; |
| 337 | |
| 338 | pages--; |
| 339 | if (!pages) |
| 340 | break; |
| 341 | dpage_idx++; |
| 342 | } |
| 343 | |
| 344 | return 0; |
| 345 | } |
| 346 | |
| 347 | static int pohmelfs_encrypt_iterator(struct pohmelfs_crypto_engine *e, |
| 348 | struct scatterlist *sg_dst, struct scatterlist *sg_src) |
| 349 | { |
| 350 | struct ablkcipher_request *req = e->data; |
| 351 | u8 iv[32]; |
| 352 | |
| 353 | memset(iv, 0, sizeof(iv)); |
| 354 | |
| 355 | memcpy(iv, &e->iv, sizeof(e->iv)); |
| 356 | |
| 357 | return pohmelfs_crypto_process(req, sg_dst, sg_src, iv, 1, e->timeout); |
| 358 | } |
| 359 | |
| 360 | static int pohmelfs_encrypt(struct pohmelfs_crypto_thread *tc) |
| 361 | { |
| 362 | struct netfs_trans *t = tc->trans; |
| 363 | struct pohmelfs_crypto_engine *e = &tc->eng; |
| 364 | struct ablkcipher_request *req = e->data; |
| 365 | |
| 366 | memset(req, 0, sizeof(struct ablkcipher_request)); |
| 367 | ablkcipher_request_set_tfm(req, e->cipher); |
| 368 | |
| 369 | e->iv = pohmelfs_gen_iv(t); |
| 370 | |
| 371 | return pohmelfs_trans_iter(t, e, pohmelfs_encrypt_iterator); |
| 372 | } |
| 373 | |
| 374 | static int pohmelfs_hash_iterator(struct pohmelfs_crypto_engine *e, |
| 375 | struct scatterlist *sg_dst, struct scatterlist *sg_src) |
| 376 | { |
| 377 | return crypto_hash_update(e->data, sg_src, sg_src->length); |
| 378 | } |
| 379 | |
| 380 | static int pohmelfs_hash(struct pohmelfs_crypto_thread *tc) |
| 381 | { |
| 382 | struct pohmelfs_crypto_engine *e = &tc->eng; |
| 383 | struct hash_desc *desc = e->data; |
| 384 | unsigned char *dst = tc->trans->iovec.iov_base + sizeof(struct netfs_cmd); |
| 385 | int err; |
| 386 | |
| 387 | desc->tfm = e->hash; |
| 388 | desc->flags = 0; |
| 389 | |
| 390 | err = crypto_hash_init(desc); |
| 391 | if (err) |
| 392 | return err; |
| 393 | |
| 394 | err = pohmelfs_trans_iter(tc->trans, e, pohmelfs_hash_iterator); |
| 395 | if (err) |
| 396 | return err; |
| 397 | |
| 398 | err = crypto_hash_final(desc, dst); |
| 399 | if (err) |
| 400 | return err; |
| 401 | |
| 402 | { |
| 403 | unsigned int i; |
| 404 | dprintk("%s: ", __func__); |
| 405 | for (i=0; i<tc->psb->crypto_attached_size; ++i) |
| 406 | dprintka("%02x ", dst[i]); |
| 407 | dprintka("\n"); |
| 408 | } |
| 409 | |
| 410 | return 0; |
| 411 | } |
| 412 | |
| 413 | static void pohmelfs_crypto_pages_free(struct pohmelfs_crypto_engine *e) |
| 414 | { |
| 415 | unsigned int i; |
| 416 | |
| 417 | for (i=0; i<e->page_num; ++i) |
| 418 | __free_page(e->pages[i]); |
| 419 | kfree(e->pages); |
| 420 | } |
| 421 | |
| 422 | static int pohmelfs_crypto_pages_alloc(struct pohmelfs_crypto_engine *e, struct pohmelfs_sb *psb) |
| 423 | { |
| 424 | unsigned int i; |
| 425 | |
| 426 | e->pages = kmalloc(psb->trans_max_pages * sizeof(struct page *), GFP_KERNEL); |
| 427 | if (!e->pages) |
| 428 | return -ENOMEM; |
| 429 | |
| 430 | for (i=0; i<psb->trans_max_pages; ++i) { |
| 431 | e->pages[i] = alloc_page(GFP_KERNEL); |
| 432 | if (!e->pages[i]) |
| 433 | break; |
| 434 | } |
| 435 | |
| 436 | e->page_num = i; |
| 437 | if (!e->page_num) |
| 438 | goto err_out_free; |
| 439 | |
| 440 | return 0; |
| 441 | |
| 442 | err_out_free: |
| 443 | kfree(e->pages); |
| 444 | return -ENOMEM; |
| 445 | } |
| 446 | |
| 447 | static void pohmelfs_sys_crypto_exit_one(struct pohmelfs_crypto_thread *t) |
| 448 | { |
| 449 | struct pohmelfs_sb *psb = t->psb; |
| 450 | |
| 451 | if (t->thread) |
| 452 | kthread_stop(t->thread); |
| 453 | |
| 454 | mutex_lock(&psb->crypto_thread_lock); |
| 455 | list_del(&t->thread_entry); |
| 456 | psb->crypto_thread_num--; |
| 457 | mutex_unlock(&psb->crypto_thread_lock); |
| 458 | |
| 459 | pohmelfs_crypto_engine_exit(&t->eng); |
| 460 | pohmelfs_crypto_pages_free(&t->eng); |
| 461 | kfree(t); |
| 462 | } |
| 463 | |
| 464 | static int pohmelfs_crypto_finish(struct netfs_trans *t, struct pohmelfs_sb *psb, int err) |
| 465 | { |
| 466 | struct netfs_cmd *cmd = t->iovec.iov_base; |
| 467 | netfs_convert_cmd(cmd); |
| 468 | |
| 469 | if (likely(!err)) |
| 470 | err = netfs_trans_finish_send(t, psb); |
| 471 | |
| 472 | t->result = err; |
| 473 | netfs_trans_put(t); |
| 474 | |
| 475 | return err; |
| 476 | } |
| 477 | |
| 478 | void pohmelfs_crypto_thread_make_ready(struct pohmelfs_crypto_thread *th) |
| 479 | { |
| 480 | struct pohmelfs_sb *psb = th->psb; |
| 481 | |
| 482 | th->page = NULL; |
| 483 | th->trans = NULL; |
| 484 | |
| 485 | mutex_lock(&psb->crypto_thread_lock); |
| 486 | list_move_tail(&th->thread_entry, &psb->crypto_ready_list); |
| 487 | mutex_unlock(&psb->crypto_thread_lock); |
| 488 | wake_up(&psb->wait); |
| 489 | } |
| 490 | |
| 491 | static int pohmelfs_crypto_thread_trans(struct pohmelfs_crypto_thread *t) |
| 492 | { |
| 493 | struct netfs_trans *trans; |
| 494 | int err = 0; |
| 495 | |
| 496 | trans = t->trans; |
| 497 | trans->eng = NULL; |
| 498 | |
| 499 | if (t->eng.hash) { |
| 500 | err = pohmelfs_hash(t); |
| 501 | if (err) |
| 502 | goto out_complete; |
| 503 | } |
| 504 | |
| 505 | if (t->eng.cipher) { |
| 506 | err = pohmelfs_encrypt(t); |
| 507 | if (err) |
| 508 | goto out_complete; |
| 509 | trans->eng = &t->eng; |
| 510 | } |
| 511 | |
| 512 | out_complete: |
| 513 | t->page = NULL; |
| 514 | t->trans = NULL; |
| 515 | |
| 516 | if (!trans->eng) |
| 517 | pohmelfs_crypto_thread_make_ready(t); |
| 518 | |
| 519 | pohmelfs_crypto_finish(trans, t->psb, err); |
| 520 | return err; |
| 521 | } |
| 522 | |
| 523 | static int pohmelfs_crypto_thread_page(struct pohmelfs_crypto_thread *t) |
| 524 | { |
| 525 | struct pohmelfs_crypto_engine *e = &t->eng; |
| 526 | struct page *page = t->page; |
| 527 | int err; |
| 528 | |
| 529 | WARN_ON(!PageChecked(page)); |
| 530 | |
| 531 | err = pohmelfs_crypto_process_input_data(e, e->iv, NULL, page, t->size); |
| 532 | if (!err) |
| 533 | SetPageUptodate(page); |
| 534 | else |
| 535 | SetPageError(page); |
| 536 | unlock_page(page); |
| 537 | page_cache_release(page); |
| 538 | |
| 539 | pohmelfs_crypto_thread_make_ready(t); |
| 540 | |
| 541 | return err; |
| 542 | } |
| 543 | |
| 544 | static int pohmelfs_crypto_thread_func(void *data) |
| 545 | { |
| 546 | struct pohmelfs_crypto_thread *t = data; |
| 547 | |
| 548 | while (!kthread_should_stop()) { |
| 549 | wait_event_interruptible(t->wait, kthread_should_stop() || |
| 550 | t->trans || t->page); |
| 551 | |
| 552 | if (kthread_should_stop()) |
| 553 | break; |
| 554 | |
| 555 | if (!t->trans && !t->page) |
| 556 | continue; |
| 557 | |
| 558 | dprintk("%s: thread: %p, trans: %p, page: %p.\n", |
| 559 | __func__, t, t->trans, t->page); |
| 560 | |
| 561 | if (t->trans) |
| 562 | pohmelfs_crypto_thread_trans(t); |
| 563 | else if (t->page) |
| 564 | pohmelfs_crypto_thread_page(t); |
| 565 | } |
| 566 | |
| 567 | return 0; |
| 568 | } |
| 569 | |
| 570 | static void pohmelfs_crypto_flush(struct pohmelfs_sb *psb, struct list_head *head) |
| 571 | { |
| 572 | while (!list_empty(head)) { |
| 573 | struct pohmelfs_crypto_thread *t = NULL; |
| 574 | |
| 575 | mutex_lock(&psb->crypto_thread_lock); |
| 576 | if (!list_empty(head)) { |
| 577 | t = list_first_entry(head, struct pohmelfs_crypto_thread, thread_entry); |
| 578 | list_del_init(&t->thread_entry); |
| 579 | } |
| 580 | mutex_unlock(&psb->crypto_thread_lock); |
| 581 | |
| 582 | if (t) |
| 583 | pohmelfs_sys_crypto_exit_one(t); |
| 584 | } |
| 585 | } |
| 586 | |
| 587 | static void pohmelfs_sys_crypto_exit(struct pohmelfs_sb *psb) |
| 588 | { |
| 589 | while (!list_empty(&psb->crypto_active_list) || !list_empty(&psb->crypto_ready_list)) { |
| 590 | dprintk("%s: crypto_thread_num: %u.\n", __func__, psb->crypto_thread_num); |
| 591 | pohmelfs_crypto_flush(psb, &psb->crypto_active_list); |
| 592 | pohmelfs_crypto_flush(psb, &psb->crypto_ready_list); |
| 593 | } |
| 594 | } |
| 595 | |
| 596 | static int pohmelfs_sys_crypto_init(struct pohmelfs_sb *psb) |
| 597 | { |
| 598 | unsigned int i; |
| 599 | struct pohmelfs_crypto_thread *t; |
| 600 | struct pohmelfs_config *c; |
| 601 | struct netfs_state *st; |
| 602 | int err; |
| 603 | |
| 604 | list_for_each_entry(c, &psb->state_list, config_entry) { |
| 605 | st = &c->state; |
| 606 | |
| 607 | err = pohmelfs_crypto_engine_init(&st->eng, psb); |
| 608 | if (err) |
| 609 | goto err_out_exit; |
| 610 | |
| 611 | dprintk("%s: st: %p, eng: %p, hash: %p, cipher: %p.\n", |
| 612 | __func__, st, &st->eng, &st->eng.hash, &st->eng.cipher); |
| 613 | } |
| 614 | |
| 615 | for (i=0; i<psb->crypto_thread_num; ++i) { |
| 616 | err = -ENOMEM; |
| 617 | t = kzalloc(sizeof(struct pohmelfs_crypto_thread), GFP_KERNEL); |
| 618 | if (!t) |
| 619 | goto err_out_free_state_engines; |
| 620 | |
| 621 | init_waitqueue_head(&t->wait); |
| 622 | |
| 623 | t->psb = psb; |
| 624 | t->trans = NULL; |
| 625 | t->eng.thread = t; |
| 626 | |
| 627 | err = pohmelfs_crypto_engine_init(&t->eng, psb); |
| 628 | if (err) |
| 629 | goto err_out_free_state_engines; |
| 630 | |
| 631 | err = pohmelfs_crypto_pages_alloc(&t->eng, psb); |
| 632 | if (err) |
| 633 | goto err_out_free; |
| 634 | |
| 635 | t->thread = kthread_run(pohmelfs_crypto_thread_func, t, |
| 636 | "pohmelfs-crypto-%d-%d", psb->idx, i); |
| 637 | if (IS_ERR(t->thread)) { |
| 638 | err = PTR_ERR(t->thread); |
| 639 | t->thread = NULL; |
| 640 | goto err_out_free; |
| 641 | } |
| 642 | |
| 643 | if (t->eng.cipher) |
| 644 | psb->crypto_align_size = crypto_ablkcipher_blocksize(t->eng.cipher); |
| 645 | |
| 646 | mutex_lock(&psb->crypto_thread_lock); |
| 647 | list_add_tail(&t->thread_entry, &psb->crypto_ready_list); |
| 648 | mutex_unlock(&psb->crypto_thread_lock); |
| 649 | } |
| 650 | |
| 651 | psb->crypto_thread_num = i; |
| 652 | return 0; |
| 653 | |
| 654 | err_out_free: |
| 655 | pohmelfs_sys_crypto_exit_one(t); |
| 656 | err_out_free_state_engines: |
| 657 | list_for_each_entry(c, &psb->state_list, config_entry) { |
| 658 | st = &c->state; |
| 659 | pohmelfs_crypto_engine_exit(&st->eng); |
| 660 | } |
| 661 | err_out_exit: |
| 662 | pohmelfs_sys_crypto_exit(psb); |
| 663 | return err; |
| 664 | } |
| 665 | |
| 666 | void pohmelfs_crypto_exit(struct pohmelfs_sb *psb) |
| 667 | { |
| 668 | pohmelfs_sys_crypto_exit(psb); |
| 669 | |
| 670 | kfree(psb->hash_string); |
| 671 | kfree(psb->cipher_string); |
| 672 | } |
| 673 | |
| 674 | static int pohmelfs_crypt_init_complete(struct page **pages, unsigned int page_num, |
| 675 | void *private, int err) |
| 676 | { |
| 677 | struct pohmelfs_sb *psb = private; |
| 678 | |
| 679 | psb->flags = -err; |
| 680 | dprintk("%s: err: %d.\n", __func__, err); |
| 681 | |
| 682 | wake_up(&psb->wait); |
| 683 | |
| 684 | return err; |
| 685 | } |
| 686 | |
| 687 | static int pohmelfs_crypto_init_handshake(struct pohmelfs_sb *psb) |
| 688 | { |
| 689 | struct netfs_trans *t; |
| 690 | struct netfs_crypto_capabilities *cap; |
| 691 | struct netfs_cmd *cmd; |
| 692 | char *str; |
| 693 | int err = -ENOMEM, size; |
| 694 | |
| 695 | size = sizeof(struct netfs_crypto_capabilities) + |
| 696 | psb->cipher_strlen + psb->hash_strlen + 2; /* 0 bytes */ |
| 697 | |
| 698 | t = netfs_trans_alloc(psb, size, 0, 0); |
| 699 | if (!t) |
| 700 | goto err_out_exit; |
| 701 | |
| 702 | t->complete = pohmelfs_crypt_init_complete; |
| 703 | t->private = psb; |
| 704 | |
| 705 | cmd = netfs_trans_current(t); |
| 706 | cap = (struct netfs_crypto_capabilities *)(cmd + 1); |
| 707 | str = (char *)(cap + 1); |
| 708 | |
| 709 | cmd->cmd = NETFS_CAPABILITIES; |
| 710 | cmd->id = POHMELFS_CRYPTO_CAPABILITIES; |
| 711 | cmd->size = size; |
| 712 | cmd->start = 0; |
| 713 | cmd->ext = 0; |
| 714 | cmd->csize = 0; |
| 715 | |
| 716 | netfs_convert_cmd(cmd); |
| 717 | netfs_trans_update(cmd, t, size); |
| 718 | |
| 719 | cap->hash_strlen = psb->hash_strlen; |
| 720 | if (cap->hash_strlen) { |
| 721 | sprintf(str, "%s", psb->hash_string); |
| 722 | str += cap->hash_strlen; |
| 723 | } |
| 724 | |
| 725 | cap->cipher_strlen = psb->cipher_strlen; |
| 726 | cap->cipher_keysize = psb->cipher_keysize; |
| 727 | if (cap->cipher_strlen) |
| 728 | sprintf(str, "%s", psb->cipher_string); |
| 729 | |
| 730 | netfs_convert_crypto_capabilities(cap); |
| 731 | |
| 732 | psb->flags = ~0; |
| 733 | err = netfs_trans_finish(t, psb); |
| 734 | if (err) |
| 735 | goto err_out_exit; |
| 736 | |
| 737 | err = wait_event_interruptible_timeout(psb->wait, (psb->flags != ~0), |
| 738 | psb->wait_on_page_timeout); |
| 739 | if (!err) |
| 740 | err = -ETIMEDOUT; |
| 741 | else |
| 742 | err = -psb->flags; |
| 743 | |
| 744 | if (!err) |
| 745 | psb->perform_crypto = 1; |
| 746 | psb->flags = 0; |
| 747 | |
| 748 | /* |
| 749 | * At this point NETFS_CAPABILITIES response command |
| 750 | * should setup superblock in a way, which is acceptible |
| 751 | * for both client and server, so if server refuses connection, |
| 752 | * it will send error in transaction response. |
| 753 | */ |
| 754 | |
| 755 | if (err) |
| 756 | goto err_out_exit; |
| 757 | |
| 758 | return 0; |
| 759 | |
| 760 | err_out_exit: |
| 761 | return err; |
| 762 | } |
| 763 | |
| 764 | int pohmelfs_crypto_init(struct pohmelfs_sb *psb) |
| 765 | { |
| 766 | int err; |
| 767 | |
| 768 | if (!psb->cipher_string && !psb->hash_string) |
| 769 | return 0; |
| 770 | |
| 771 | err = pohmelfs_crypto_init_handshake(psb); |
| 772 | if (err) |
| 773 | return err; |
| 774 | |
| 775 | err = pohmelfs_sys_crypto_init(psb); |
| 776 | if (err) |
| 777 | return err; |
| 778 | |
| 779 | return 0; |
| 780 | } |
| 781 | |
| 782 | static int pohmelfs_crypto_thread_get(struct pohmelfs_sb *psb, |
| 783 | int (* action)(struct pohmelfs_crypto_thread *t, void *data), void *data) |
| 784 | { |
| 785 | struct pohmelfs_crypto_thread *t = NULL; |
| 786 | int err; |
| 787 | |
| 788 | while (!t) { |
| 789 | err = wait_event_interruptible_timeout(psb->wait, |
| 790 | !list_empty(&psb->crypto_ready_list), |
| 791 | psb->wait_on_page_timeout); |
| 792 | |
| 793 | t = NULL; |
| 794 | err = 0; |
| 795 | mutex_lock(&psb->crypto_thread_lock); |
| 796 | if (!list_empty(&psb->crypto_ready_list)) { |
| 797 | t = list_entry(psb->crypto_ready_list.prev, |
| 798 | struct pohmelfs_crypto_thread, |
| 799 | thread_entry); |
| 800 | |
| 801 | list_move_tail(&t->thread_entry, |
| 802 | &psb->crypto_active_list); |
| 803 | |
| 804 | action(t, data); |
| 805 | wake_up(&t->wait); |
| 806 | |
| 807 | } |
| 808 | mutex_unlock(&psb->crypto_thread_lock); |
| 809 | } |
| 810 | |
| 811 | return err; |
| 812 | } |
| 813 | |
| 814 | static int pohmelfs_trans_crypt_action(struct pohmelfs_crypto_thread *t, void *data) |
| 815 | { |
| 816 | struct netfs_trans *trans = data; |
| 817 | |
| 818 | netfs_trans_get(trans); |
| 819 | t->trans = trans; |
| 820 | |
| 821 | dprintk("%s: t: %p, gen: %u, thread: %p.\n", __func__, trans, trans->gen, t); |
| 822 | return 0; |
| 823 | } |
| 824 | |
| 825 | int pohmelfs_trans_crypt(struct netfs_trans *trans, struct pohmelfs_sb *psb) |
| 826 | { |
| 827 | if ((!psb->hash_string && !psb->cipher_string) || !psb->perform_crypto) { |
| 828 | netfs_trans_get(trans); |
| 829 | return pohmelfs_crypto_finish(trans, psb, 0); |
| 830 | } |
| 831 | |
| 832 | return pohmelfs_crypto_thread_get(psb, pohmelfs_trans_crypt_action, trans); |
| 833 | } |
| 834 | |
Bill Pemberton | 385e3f1 | 2009-04-22 08:59:13 -0400 | [diff] [blame] | 835 | struct pohmelfs_crypto_input_action_data { |
Evgeniy Polyakov | e2396ae | 2009-02-09 17:02:36 +0300 | [diff] [blame] | 836 | struct page *page; |
| 837 | struct pohmelfs_crypto_engine *e; |
| 838 | u64 iv; |
| 839 | unsigned int size; |
| 840 | }; |
| 841 | |
| 842 | static int pohmelfs_crypt_input_page_action(struct pohmelfs_crypto_thread *t, void *data) |
| 843 | { |
| 844 | struct pohmelfs_crypto_input_action_data *act = data; |
| 845 | |
| 846 | memcpy(t->eng.data, act->e->data, t->psb->crypto_attached_size); |
| 847 | |
| 848 | t->size = act->size; |
| 849 | t->eng.iv = act->iv; |
| 850 | |
| 851 | t->page = act->page; |
| 852 | return 0; |
| 853 | } |
| 854 | |
| 855 | int pohmelfs_crypto_process_input_page(struct pohmelfs_crypto_engine *e, |
| 856 | struct page *page, unsigned int size, u64 iv) |
| 857 | { |
| 858 | struct inode *inode = page->mapping->host; |
| 859 | struct pohmelfs_crypto_input_action_data act; |
| 860 | int err = -ENOENT; |
| 861 | |
| 862 | act.page = page; |
| 863 | act.e = e; |
| 864 | act.size = size; |
| 865 | act.iv = iv; |
| 866 | |
| 867 | err = pohmelfs_crypto_thread_get(POHMELFS_SB(inode->i_sb), |
| 868 | pohmelfs_crypt_input_page_action, &act); |
| 869 | if (err) |
| 870 | goto err_out_exit; |
| 871 | |
| 872 | return 0; |
| 873 | |
| 874 | err_out_exit: |
| 875 | SetPageUptodate(page); |
| 876 | page_cache_release(page); |
| 877 | |
| 878 | return err; |
| 879 | } |