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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 | { | |
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) { | |
e3f052f2 RP |
173 | case -EINPROGRESS: |
174 | case -EBUSY: | |
175 | err = wait_for_completion_interruptible_timeout(&complete.complete, | |
e2396ae5 | 176 | timeout); |
e3f052f2 RP |
177 | if (!err) |
178 | err = -ETIMEDOUT; | |
179 | else if (err > 0) | |
180 | err = complete.error; | |
181 | break; | |
182 | default: | |
183 | break; | |
e2396ae5 EP |
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", | |
e3f052f2 | 199 | __func__, e, cmd_iv, data, page, (page) ? page->index : 0, size); |
e2396ae5 EP |
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); | |
e3f052f2 | 250 | for (i = 0; i < crypto_hash_digestsize(e->hash); ++i) { |
e2396ae5 EP |
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, | |
e3f052f2 | 282 | int (*iterator) (struct pohmelfs_crypto_engine *e, |
e2396ae5 EP |
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; | |
e3f052f2 | 322 | for (i = 0; i < t->page_num; ++i) { |
e2396ae5 EP |
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__); | |
e3f052f2 | 405 | for (i = 0; i < tc->psb->crypto_attached_size; ++i) |
e2396ae5 EP |
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 | ||
e3f052f2 | 417 | for (i = 0; i < e->page_num; ++i) |
e2396ae5 EP |
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 | ||
e3f052f2 | 430 | for (i = 0; i < psb->trans_max_pages; ++i) { |
e2396ae5 EP |
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 | ||
e3f052f2 | 615 | for (i = 0; i < psb->crypto_thread_num; ++i) { |
e2396ae5 EP |
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; | |
2d7cf8ef | 741 | else if (err > 0) |
e2396ae5 EP |
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, | |
e3f052f2 | 783 | int (*action)(struct pohmelfs_crypto_thread *t, void *data), void *data) |
e2396ae5 EP |
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 | ||
385e3f1a | 835 | struct pohmelfs_crypto_input_action_data { |
e2396ae5 EP |
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 | } |