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e2396ae5 EP |
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 | { | |
391a169e JJ |
133 | crypto_free_hash(e->hash); |
134 | crypto_free_ablkcipher(e->cipher); | |
e2396ae5 EP |
135 | kfree(e->data); |
136 | } | |
137 | ||
138 | static void pohmelfs_crypto_complete(struct crypto_async_request *req, int err) | |
139 | { | |
140 | struct pohmelfs_crypto_completion *c = req->data; | |
141 | ||
142 | if (err == -EINPROGRESS) | |
143 | return; | |
144 | ||
145 | dprintk("%s: req: %p, err: %d.\n", __func__, req, err); | |
146 | c->error = err; | |
147 | complete(&c->complete); | |
148 | } | |
149 | ||
150 | static int pohmelfs_crypto_process(struct ablkcipher_request *req, | |
151 | struct scatterlist *sg_dst, struct scatterlist *sg_src, | |
152 | void *iv, int enc, unsigned long timeout) | |
153 | { | |
154 | struct pohmelfs_crypto_completion complete; | |
155 | int err; | |
156 | ||
157 | init_completion(&complete.complete); | |
158 | complete.error = -EINPROGRESS; | |
159 | ||
160 | ablkcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG, | |
161 | pohmelfs_crypto_complete, &complete); | |
162 | ||
163 | ablkcipher_request_set_crypt(req, sg_src, sg_dst, sg_src->length, iv); | |
164 | ||
165 | if (enc) | |
166 | err = crypto_ablkcipher_encrypt(req); | |
167 | else | |
168 | err = crypto_ablkcipher_decrypt(req); | |
169 | ||
170 | switch (err) { | |
e3f052f2 RP |
171 | case -EINPROGRESS: |
172 | case -EBUSY: | |
173 | err = wait_for_completion_interruptible_timeout(&complete.complete, | |
e2396ae5 | 174 | timeout); |
e3f052f2 RP |
175 | if (!err) |
176 | err = -ETIMEDOUT; | |
177 | else if (err > 0) | |
178 | err = complete.error; | |
179 | break; | |
180 | default: | |
181 | break; | |
e2396ae5 EP |
182 | } |
183 | ||
184 | return err; | |
185 | } | |
186 | ||
187 | int pohmelfs_crypto_process_input_data(struct pohmelfs_crypto_engine *e, u64 cmd_iv, | |
188 | void *data, struct page *page, unsigned int size) | |
189 | { | |
190 | int err; | |
191 | struct scatterlist sg; | |
192 | ||
193 | if (!e->cipher && !e->hash) | |
194 | return 0; | |
195 | ||
196 | dprintk("%s: eng: %p, iv: %llx, data: %p, page: %p/%lu, size: %u.\n", | |
e3f052f2 | 197 | __func__, e, cmd_iv, data, page, (page) ? page->index : 0, size); |
e2396ae5 EP |
198 | |
199 | if (data) { | |
200 | sg_init_one(&sg, data, size); | |
201 | } else { | |
202 | sg_init_table(&sg, 1); | |
203 | sg_set_page(&sg, page, size, 0); | |
204 | } | |
205 | ||
206 | if (e->cipher) { | |
207 | struct ablkcipher_request *req = e->data + crypto_hash_digestsize(e->hash); | |
208 | u8 iv[32]; | |
209 | ||
210 | memset(iv, 0, sizeof(iv)); | |
211 | memcpy(iv, &cmd_iv, sizeof(cmd_iv)); | |
212 | ||
213 | ablkcipher_request_set_tfm(req, e->cipher); | |
214 | ||
215 | err = pohmelfs_crypto_process(req, &sg, &sg, iv, 0, e->timeout); | |
216 | if (err) | |
217 | goto err_out_exit; | |
218 | } | |
219 | ||
220 | if (e->hash) { | |
221 | struct hash_desc desc; | |
222 | void *dst = e->data + e->size/2; | |
223 | ||
224 | desc.tfm = e->hash; | |
225 | desc.flags = 0; | |
226 | ||
227 | err = crypto_hash_init(&desc); | |
228 | if (err) | |
229 | goto err_out_exit; | |
230 | ||
231 | err = crypto_hash_update(&desc, &sg, size); | |
232 | if (err) | |
233 | goto err_out_exit; | |
234 | ||
235 | err = crypto_hash_final(&desc, dst); | |
236 | if (err) | |
237 | goto err_out_exit; | |
238 | ||
239 | err = !!memcmp(dst, e->data, crypto_hash_digestsize(e->hash)); | |
240 | ||
241 | if (err) { | |
242 | #ifdef CONFIG_POHMELFS_DEBUG | |
243 | unsigned int i; | |
244 | unsigned char *recv = e->data, *calc = dst; | |
245 | ||
246 | dprintk("%s: eng: %p, hash: %p, cipher: %p: iv : %llx, hash mismatch (recv/calc): ", | |
247 | __func__, e, e->hash, e->cipher, cmd_iv); | |
e3f052f2 | 248 | for (i = 0; i < crypto_hash_digestsize(e->hash); ++i) { |
e2396ae5 EP |
249 | #if 0 |
250 | dprintka("%02x ", recv[i]); | |
251 | if (recv[i] != calc[i]) { | |
252 | dprintka("| calc byte: %02x.\n", calc[i]); | |
253 | break; | |
254 | } | |
255 | #else | |
256 | dprintka("%02x/%02x ", recv[i], calc[i]); | |
257 | #endif | |
258 | } | |
259 | dprintk("\n"); | |
260 | #endif | |
261 | goto err_out_exit; | |
262 | } else { | |
263 | dprintk("%s: eng: %p, hash: %p, cipher: %p: hashes matched.\n", | |
264 | __func__, e, e->hash, e->cipher); | |
265 | } | |
266 | } | |
267 | ||
268 | dprintk("%s: eng: %p, size: %u, hash: %p, cipher: %p: completed.\n", | |
269 | __func__, e, e->size, e->hash, e->cipher); | |
270 | ||
271 | return 0; | |
272 | ||
273 | err_out_exit: | |
274 | dprintk("%s: eng: %p, hash: %p, cipher: %p: err: %d.\n", | |
275 | __func__, e, e->hash, e->cipher, err); | |
276 | return err; | |
277 | } | |
278 | ||
279 | static int pohmelfs_trans_iter(struct netfs_trans *t, struct pohmelfs_crypto_engine *e, | |
e3f052f2 | 280 | int (*iterator) (struct pohmelfs_crypto_engine *e, |
e2396ae5 EP |
281 | struct scatterlist *dst, |
282 | struct scatterlist *src)) | |
283 | { | |
284 | void *data = t->iovec.iov_base + sizeof(struct netfs_cmd) + t->psb->crypto_attached_size; | |
285 | unsigned int size = t->iovec.iov_len - sizeof(struct netfs_cmd) - t->psb->crypto_attached_size; | |
286 | struct netfs_cmd *cmd = data; | |
287 | unsigned int sz, pages = t->attached_pages, i, csize, cmd_cmd, dpage_idx; | |
288 | struct scatterlist sg_src, sg_dst; | |
289 | int err; | |
290 | ||
291 | while (size) { | |
292 | cmd = data; | |
293 | cmd_cmd = __be16_to_cpu(cmd->cmd); | |
294 | csize = __be32_to_cpu(cmd->size); | |
295 | cmd->iv = __cpu_to_be64(e->iv); | |
296 | ||
297 | if (cmd_cmd == NETFS_READ_PAGES || cmd_cmd == NETFS_READ_PAGE) | |
298 | csize = __be16_to_cpu(cmd->ext); | |
299 | ||
300 | sz = csize + __be16_to_cpu(cmd->cpad) + sizeof(struct netfs_cmd); | |
301 | ||
302 | dprintk("%s: size: %u, sz: %u, cmd_size: %u, cmd_cpad: %u.\n", | |
303 | __func__, size, sz, __be32_to_cpu(cmd->size), __be16_to_cpu(cmd->cpad)); | |
304 | ||
305 | data += sz; | |
306 | size -= sz; | |
307 | ||
308 | sg_init_one(&sg_src, cmd->data, sz - sizeof(struct netfs_cmd)); | |
309 | sg_init_one(&sg_dst, cmd->data, sz - sizeof(struct netfs_cmd)); | |
310 | ||
311 | err = iterator(e, &sg_dst, &sg_src); | |
312 | if (err) | |
313 | return err; | |
314 | } | |
315 | ||
316 | if (!pages) | |
317 | return 0; | |
318 | ||
319 | dpage_idx = 0; | |
e3f052f2 | 320 | for (i = 0; i < t->page_num; ++i) { |
e2396ae5 EP |
321 | struct page *page = t->pages[i]; |
322 | struct page *dpage = e->pages[dpage_idx]; | |
323 | ||
324 | if (!page) | |
325 | continue; | |
326 | ||
327 | sg_init_table(&sg_src, 1); | |
328 | sg_init_table(&sg_dst, 1); | |
329 | sg_set_page(&sg_src, page, page_private(page), 0); | |
330 | sg_set_page(&sg_dst, dpage, page_private(page), 0); | |
331 | ||
332 | err = iterator(e, &sg_dst, &sg_src); | |
333 | if (err) | |
334 | return err; | |
335 | ||
336 | pages--; | |
337 | if (!pages) | |
338 | break; | |
339 | dpage_idx++; | |
340 | } | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
345 | static int pohmelfs_encrypt_iterator(struct pohmelfs_crypto_engine *e, | |
346 | struct scatterlist *sg_dst, struct scatterlist *sg_src) | |
347 | { | |
348 | struct ablkcipher_request *req = e->data; | |
349 | u8 iv[32]; | |
350 | ||
351 | memset(iv, 0, sizeof(iv)); | |
352 | ||
353 | memcpy(iv, &e->iv, sizeof(e->iv)); | |
354 | ||
355 | return pohmelfs_crypto_process(req, sg_dst, sg_src, iv, 1, e->timeout); | |
356 | } | |
357 | ||
358 | static int pohmelfs_encrypt(struct pohmelfs_crypto_thread *tc) | |
359 | { | |
360 | struct netfs_trans *t = tc->trans; | |
361 | struct pohmelfs_crypto_engine *e = &tc->eng; | |
362 | struct ablkcipher_request *req = e->data; | |
363 | ||
364 | memset(req, 0, sizeof(struct ablkcipher_request)); | |
365 | ablkcipher_request_set_tfm(req, e->cipher); | |
366 | ||
367 | e->iv = pohmelfs_gen_iv(t); | |
368 | ||
369 | return pohmelfs_trans_iter(t, e, pohmelfs_encrypt_iterator); | |
370 | } | |
371 | ||
372 | static int pohmelfs_hash_iterator(struct pohmelfs_crypto_engine *e, | |
373 | struct scatterlist *sg_dst, struct scatterlist *sg_src) | |
374 | { | |
375 | return crypto_hash_update(e->data, sg_src, sg_src->length); | |
376 | } | |
377 | ||
378 | static int pohmelfs_hash(struct pohmelfs_crypto_thread *tc) | |
379 | { | |
380 | struct pohmelfs_crypto_engine *e = &tc->eng; | |
381 | struct hash_desc *desc = e->data; | |
382 | unsigned char *dst = tc->trans->iovec.iov_base + sizeof(struct netfs_cmd); | |
383 | int err; | |
384 | ||
385 | desc->tfm = e->hash; | |
386 | desc->flags = 0; | |
387 | ||
388 | err = crypto_hash_init(desc); | |
389 | if (err) | |
390 | return err; | |
391 | ||
392 | err = pohmelfs_trans_iter(tc->trans, e, pohmelfs_hash_iterator); | |
393 | if (err) | |
394 | return err; | |
395 | ||
396 | err = crypto_hash_final(desc, dst); | |
397 | if (err) | |
398 | return err; | |
399 | ||
400 | { | |
401 | unsigned int i; | |
402 | dprintk("%s: ", __func__); | |
e3f052f2 | 403 | for (i = 0; i < tc->psb->crypto_attached_size; ++i) |
e2396ae5 EP |
404 | dprintka("%02x ", dst[i]); |
405 | dprintka("\n"); | |
406 | } | |
407 | ||
408 | return 0; | |
409 | } | |
410 | ||
411 | static void pohmelfs_crypto_pages_free(struct pohmelfs_crypto_engine *e) | |
412 | { | |
413 | unsigned int i; | |
414 | ||
e3f052f2 | 415 | for (i = 0; i < e->page_num; ++i) |
e2396ae5 EP |
416 | __free_page(e->pages[i]); |
417 | kfree(e->pages); | |
418 | } | |
419 | ||
420 | static int pohmelfs_crypto_pages_alloc(struct pohmelfs_crypto_engine *e, struct pohmelfs_sb *psb) | |
421 | { | |
422 | unsigned int i; | |
423 | ||
424 | e->pages = kmalloc(psb->trans_max_pages * sizeof(struct page *), GFP_KERNEL); | |
425 | if (!e->pages) | |
426 | return -ENOMEM; | |
427 | ||
e3f052f2 | 428 | for (i = 0; i < psb->trans_max_pages; ++i) { |
e2396ae5 EP |
429 | e->pages[i] = alloc_page(GFP_KERNEL); |
430 | if (!e->pages[i]) | |
431 | break; | |
432 | } | |
433 | ||
434 | e->page_num = i; | |
435 | if (!e->page_num) | |
436 | goto err_out_free; | |
437 | ||
438 | return 0; | |
439 | ||
440 | err_out_free: | |
441 | kfree(e->pages); | |
442 | return -ENOMEM; | |
443 | } | |
444 | ||
445 | static void pohmelfs_sys_crypto_exit_one(struct pohmelfs_crypto_thread *t) | |
446 | { | |
447 | struct pohmelfs_sb *psb = t->psb; | |
448 | ||
449 | if (t->thread) | |
450 | kthread_stop(t->thread); | |
451 | ||
452 | mutex_lock(&psb->crypto_thread_lock); | |
453 | list_del(&t->thread_entry); | |
454 | psb->crypto_thread_num--; | |
455 | mutex_unlock(&psb->crypto_thread_lock); | |
456 | ||
457 | pohmelfs_crypto_engine_exit(&t->eng); | |
458 | pohmelfs_crypto_pages_free(&t->eng); | |
459 | kfree(t); | |
460 | } | |
461 | ||
462 | static int pohmelfs_crypto_finish(struct netfs_trans *t, struct pohmelfs_sb *psb, int err) | |
463 | { | |
464 | struct netfs_cmd *cmd = t->iovec.iov_base; | |
465 | netfs_convert_cmd(cmd); | |
466 | ||
467 | if (likely(!err)) | |
468 | err = netfs_trans_finish_send(t, psb); | |
469 | ||
470 | t->result = err; | |
471 | netfs_trans_put(t); | |
472 | ||
473 | return err; | |
474 | } | |
475 | ||
476 | void pohmelfs_crypto_thread_make_ready(struct pohmelfs_crypto_thread *th) | |
477 | { | |
478 | struct pohmelfs_sb *psb = th->psb; | |
479 | ||
480 | th->page = NULL; | |
481 | th->trans = NULL; | |
482 | ||
483 | mutex_lock(&psb->crypto_thread_lock); | |
484 | list_move_tail(&th->thread_entry, &psb->crypto_ready_list); | |
485 | mutex_unlock(&psb->crypto_thread_lock); | |
486 | wake_up(&psb->wait); | |
487 | } | |
488 | ||
489 | static int pohmelfs_crypto_thread_trans(struct pohmelfs_crypto_thread *t) | |
490 | { | |
491 | struct netfs_trans *trans; | |
492 | int err = 0; | |
493 | ||
494 | trans = t->trans; | |
495 | trans->eng = NULL; | |
496 | ||
497 | if (t->eng.hash) { | |
498 | err = pohmelfs_hash(t); | |
499 | if (err) | |
500 | goto out_complete; | |
501 | } | |
502 | ||
503 | if (t->eng.cipher) { | |
504 | err = pohmelfs_encrypt(t); | |
505 | if (err) | |
506 | goto out_complete; | |
507 | trans->eng = &t->eng; | |
508 | } | |
509 | ||
510 | out_complete: | |
511 | t->page = NULL; | |
512 | t->trans = NULL; | |
513 | ||
514 | if (!trans->eng) | |
515 | pohmelfs_crypto_thread_make_ready(t); | |
516 | ||
517 | pohmelfs_crypto_finish(trans, t->psb, err); | |
518 | return err; | |
519 | } | |
520 | ||
521 | static int pohmelfs_crypto_thread_page(struct pohmelfs_crypto_thread *t) | |
522 | { | |
523 | struct pohmelfs_crypto_engine *e = &t->eng; | |
524 | struct page *page = t->page; | |
525 | int err; | |
526 | ||
527 | WARN_ON(!PageChecked(page)); | |
528 | ||
529 | err = pohmelfs_crypto_process_input_data(e, e->iv, NULL, page, t->size); | |
530 | if (!err) | |
531 | SetPageUptodate(page); | |
532 | else | |
533 | SetPageError(page); | |
534 | unlock_page(page); | |
535 | page_cache_release(page); | |
536 | ||
537 | pohmelfs_crypto_thread_make_ready(t); | |
538 | ||
539 | return err; | |
540 | } | |
541 | ||
542 | static int pohmelfs_crypto_thread_func(void *data) | |
543 | { | |
544 | struct pohmelfs_crypto_thread *t = data; | |
545 | ||
546 | while (!kthread_should_stop()) { | |
547 | wait_event_interruptible(t->wait, kthread_should_stop() || | |
548 | t->trans || t->page); | |
549 | ||
550 | if (kthread_should_stop()) | |
551 | break; | |
552 | ||
553 | if (!t->trans && !t->page) | |
554 | continue; | |
555 | ||
556 | dprintk("%s: thread: %p, trans: %p, page: %p.\n", | |
557 | __func__, t, t->trans, t->page); | |
558 | ||
559 | if (t->trans) | |
560 | pohmelfs_crypto_thread_trans(t); | |
561 | else if (t->page) | |
562 | pohmelfs_crypto_thread_page(t); | |
563 | } | |
564 | ||
565 | return 0; | |
566 | } | |
567 | ||
568 | static void pohmelfs_crypto_flush(struct pohmelfs_sb *psb, struct list_head *head) | |
569 | { | |
570 | while (!list_empty(head)) { | |
571 | struct pohmelfs_crypto_thread *t = NULL; | |
572 | ||
573 | mutex_lock(&psb->crypto_thread_lock); | |
574 | if (!list_empty(head)) { | |
575 | t = list_first_entry(head, struct pohmelfs_crypto_thread, thread_entry); | |
576 | list_del_init(&t->thread_entry); | |
577 | } | |
578 | mutex_unlock(&psb->crypto_thread_lock); | |
579 | ||
580 | if (t) | |
581 | pohmelfs_sys_crypto_exit_one(t); | |
582 | } | |
583 | } | |
584 | ||
585 | static void pohmelfs_sys_crypto_exit(struct pohmelfs_sb *psb) | |
586 | { | |
587 | while (!list_empty(&psb->crypto_active_list) || !list_empty(&psb->crypto_ready_list)) { | |
588 | dprintk("%s: crypto_thread_num: %u.\n", __func__, psb->crypto_thread_num); | |
589 | pohmelfs_crypto_flush(psb, &psb->crypto_active_list); | |
590 | pohmelfs_crypto_flush(psb, &psb->crypto_ready_list); | |
591 | } | |
592 | } | |
593 | ||
594 | static int pohmelfs_sys_crypto_init(struct pohmelfs_sb *psb) | |
595 | { | |
596 | unsigned int i; | |
597 | struct pohmelfs_crypto_thread *t; | |
598 | struct pohmelfs_config *c; | |
599 | struct netfs_state *st; | |
600 | int err; | |
601 | ||
602 | list_for_each_entry(c, &psb->state_list, config_entry) { | |
603 | st = &c->state; | |
604 | ||
605 | err = pohmelfs_crypto_engine_init(&st->eng, psb); | |
606 | if (err) | |
607 | goto err_out_exit; | |
608 | ||
609 | dprintk("%s: st: %p, eng: %p, hash: %p, cipher: %p.\n", | |
610 | __func__, st, &st->eng, &st->eng.hash, &st->eng.cipher); | |
611 | } | |
612 | ||
e3f052f2 | 613 | for (i = 0; i < psb->crypto_thread_num; ++i) { |
e2396ae5 EP |
614 | err = -ENOMEM; |
615 | t = kzalloc(sizeof(struct pohmelfs_crypto_thread), GFP_KERNEL); | |
616 | if (!t) | |
617 | goto err_out_free_state_engines; | |
618 | ||
619 | init_waitqueue_head(&t->wait); | |
620 | ||
621 | t->psb = psb; | |
622 | t->trans = NULL; | |
623 | t->eng.thread = t; | |
624 | ||
625 | err = pohmelfs_crypto_engine_init(&t->eng, psb); | |
626 | if (err) | |
627 | goto err_out_free_state_engines; | |
628 | ||
629 | err = pohmelfs_crypto_pages_alloc(&t->eng, psb); | |
630 | if (err) | |
631 | goto err_out_free; | |
632 | ||
633 | t->thread = kthread_run(pohmelfs_crypto_thread_func, t, | |
634 | "pohmelfs-crypto-%d-%d", psb->idx, i); | |
635 | if (IS_ERR(t->thread)) { | |
636 | err = PTR_ERR(t->thread); | |
637 | t->thread = NULL; | |
638 | goto err_out_free; | |
639 | } | |
640 | ||
641 | if (t->eng.cipher) | |
642 | psb->crypto_align_size = crypto_ablkcipher_blocksize(t->eng.cipher); | |
643 | ||
644 | mutex_lock(&psb->crypto_thread_lock); | |
645 | list_add_tail(&t->thread_entry, &psb->crypto_ready_list); | |
646 | mutex_unlock(&psb->crypto_thread_lock); | |
647 | } | |
648 | ||
649 | psb->crypto_thread_num = i; | |
650 | return 0; | |
651 | ||
652 | err_out_free: | |
653 | pohmelfs_sys_crypto_exit_one(t); | |
654 | err_out_free_state_engines: | |
655 | list_for_each_entry(c, &psb->state_list, config_entry) { | |
656 | st = &c->state; | |
657 | pohmelfs_crypto_engine_exit(&st->eng); | |
658 | } | |
659 | err_out_exit: | |
660 | pohmelfs_sys_crypto_exit(psb); | |
661 | return err; | |
662 | } | |
663 | ||
664 | void pohmelfs_crypto_exit(struct pohmelfs_sb *psb) | |
665 | { | |
666 | pohmelfs_sys_crypto_exit(psb); | |
667 | ||
668 | kfree(psb->hash_string); | |
669 | kfree(psb->cipher_string); | |
670 | } | |
671 | ||
672 | static int pohmelfs_crypt_init_complete(struct page **pages, unsigned int page_num, | |
673 | void *private, int err) | |
674 | { | |
675 | struct pohmelfs_sb *psb = private; | |
676 | ||
677 | psb->flags = -err; | |
678 | dprintk("%s: err: %d.\n", __func__, err); | |
679 | ||
680 | wake_up(&psb->wait); | |
681 | ||
682 | return err; | |
683 | } | |
684 | ||
685 | static int pohmelfs_crypto_init_handshake(struct pohmelfs_sb *psb) | |
686 | { | |
687 | struct netfs_trans *t; | |
688 | struct netfs_crypto_capabilities *cap; | |
689 | struct netfs_cmd *cmd; | |
690 | char *str; | |
691 | int err = -ENOMEM, size; | |
692 | ||
693 | size = sizeof(struct netfs_crypto_capabilities) + | |
694 | psb->cipher_strlen + psb->hash_strlen + 2; /* 0 bytes */ | |
695 | ||
696 | t = netfs_trans_alloc(psb, size, 0, 0); | |
697 | if (!t) | |
698 | goto err_out_exit; | |
699 | ||
700 | t->complete = pohmelfs_crypt_init_complete; | |
701 | t->private = psb; | |
702 | ||
703 | cmd = netfs_trans_current(t); | |
704 | cap = (struct netfs_crypto_capabilities *)(cmd + 1); | |
705 | str = (char *)(cap + 1); | |
706 | ||
707 | cmd->cmd = NETFS_CAPABILITIES; | |
708 | cmd->id = POHMELFS_CRYPTO_CAPABILITIES; | |
709 | cmd->size = size; | |
710 | cmd->start = 0; | |
711 | cmd->ext = 0; | |
712 | cmd->csize = 0; | |
713 | ||
714 | netfs_convert_cmd(cmd); | |
715 | netfs_trans_update(cmd, t, size); | |
716 | ||
717 | cap->hash_strlen = psb->hash_strlen; | |
718 | if (cap->hash_strlen) { | |
719 | sprintf(str, "%s", psb->hash_string); | |
720 | str += cap->hash_strlen; | |
721 | } | |
722 | ||
723 | cap->cipher_strlen = psb->cipher_strlen; | |
724 | cap->cipher_keysize = psb->cipher_keysize; | |
725 | if (cap->cipher_strlen) | |
726 | sprintf(str, "%s", psb->cipher_string); | |
727 | ||
728 | netfs_convert_crypto_capabilities(cap); | |
729 | ||
730 | psb->flags = ~0; | |
731 | err = netfs_trans_finish(t, psb); | |
732 | if (err) | |
733 | goto err_out_exit; | |
734 | ||
735 | err = wait_event_interruptible_timeout(psb->wait, (psb->flags != ~0), | |
736 | psb->wait_on_page_timeout); | |
737 | if (!err) | |
738 | err = -ETIMEDOUT; | |
2d7cf8ef | 739 | else if (err > 0) |
e2396ae5 EP |
740 | err = -psb->flags; |
741 | ||
742 | if (!err) | |
743 | psb->perform_crypto = 1; | |
744 | psb->flags = 0; | |
745 | ||
746 | /* | |
747 | * At this point NETFS_CAPABILITIES response command | |
25985edc | 748 | * should setup superblock in a way, which is acceptable |
e2396ae5 EP |
749 | * for both client and server, so if server refuses connection, |
750 | * it will send error in transaction response. | |
751 | */ | |
752 | ||
753 | if (err) | |
754 | goto err_out_exit; | |
755 | ||
756 | return 0; | |
757 | ||
758 | err_out_exit: | |
759 | return err; | |
760 | } | |
761 | ||
762 | int pohmelfs_crypto_init(struct pohmelfs_sb *psb) | |
763 | { | |
764 | int err; | |
765 | ||
766 | if (!psb->cipher_string && !psb->hash_string) | |
767 | return 0; | |
768 | ||
769 | err = pohmelfs_crypto_init_handshake(psb); | |
770 | if (err) | |
771 | return err; | |
772 | ||
773 | err = pohmelfs_sys_crypto_init(psb); | |
774 | if (err) | |
775 | return err; | |
776 | ||
777 | return 0; | |
778 | } | |
779 | ||
780 | static int pohmelfs_crypto_thread_get(struct pohmelfs_sb *psb, | |
e3f052f2 | 781 | int (*action)(struct pohmelfs_crypto_thread *t, void *data), void *data) |
e2396ae5 EP |
782 | { |
783 | struct pohmelfs_crypto_thread *t = NULL; | |
784 | int err; | |
785 | ||
786 | while (!t) { | |
787 | err = wait_event_interruptible_timeout(psb->wait, | |
788 | !list_empty(&psb->crypto_ready_list), | |
789 | psb->wait_on_page_timeout); | |
790 | ||
791 | t = NULL; | |
792 | err = 0; | |
793 | mutex_lock(&psb->crypto_thread_lock); | |
794 | if (!list_empty(&psb->crypto_ready_list)) { | |
795 | t = list_entry(psb->crypto_ready_list.prev, | |
796 | struct pohmelfs_crypto_thread, | |
797 | thread_entry); | |
798 | ||
799 | list_move_tail(&t->thread_entry, | |
800 | &psb->crypto_active_list); | |
801 | ||
802 | action(t, data); | |
803 | wake_up(&t->wait); | |
804 | ||
805 | } | |
806 | mutex_unlock(&psb->crypto_thread_lock); | |
807 | } | |
808 | ||
809 | return err; | |
810 | } | |
811 | ||
812 | static int pohmelfs_trans_crypt_action(struct pohmelfs_crypto_thread *t, void *data) | |
813 | { | |
814 | struct netfs_trans *trans = data; | |
815 | ||
816 | netfs_trans_get(trans); | |
817 | t->trans = trans; | |
818 | ||
819 | dprintk("%s: t: %p, gen: %u, thread: %p.\n", __func__, trans, trans->gen, t); | |
820 | return 0; | |
821 | } | |
822 | ||
823 | int pohmelfs_trans_crypt(struct netfs_trans *trans, struct pohmelfs_sb *psb) | |
824 | { | |
825 | if ((!psb->hash_string && !psb->cipher_string) || !psb->perform_crypto) { | |
826 | netfs_trans_get(trans); | |
827 | return pohmelfs_crypto_finish(trans, psb, 0); | |
828 | } | |
829 | ||
830 | return pohmelfs_crypto_thread_get(psb, pohmelfs_trans_crypt_action, trans); | |
831 | } | |
832 | ||
385e3f1a | 833 | struct pohmelfs_crypto_input_action_data { |
e2396ae5 EP |
834 | struct page *page; |
835 | struct pohmelfs_crypto_engine *e; | |
836 | u64 iv; | |
837 | unsigned int size; | |
838 | }; | |
839 | ||
840 | static int pohmelfs_crypt_input_page_action(struct pohmelfs_crypto_thread *t, void *data) | |
841 | { | |
842 | struct pohmelfs_crypto_input_action_data *act = data; | |
843 | ||
844 | memcpy(t->eng.data, act->e->data, t->psb->crypto_attached_size); | |
845 | ||
846 | t->size = act->size; | |
847 | t->eng.iv = act->iv; | |
848 | ||
849 | t->page = act->page; | |
850 | return 0; | |
851 | } | |
852 | ||
853 | int pohmelfs_crypto_process_input_page(struct pohmelfs_crypto_engine *e, | |
854 | struct page *page, unsigned int size, u64 iv) | |
855 | { | |
856 | struct inode *inode = page->mapping->host; | |
857 | struct pohmelfs_crypto_input_action_data act; | |
858 | int err = -ENOENT; | |
859 | ||
860 | act.page = page; | |
861 | act.e = e; | |
862 | act.size = size; | |
863 | act.iv = iv; | |
864 | ||
865 | err = pohmelfs_crypto_thread_get(POHMELFS_SB(inode->i_sb), | |
866 | pohmelfs_crypt_input_page_action, &act); | |
867 | if (err) | |
868 | goto err_out_exit; | |
869 | ||
870 | return 0; | |
871 | ||
872 | err_out_exit: | |
873 | SetPageUptodate(page); | |
874 | page_cache_release(page); | |
875 | ||
876 | return err; | |
877 | } |