Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2003 Christophe Saout <christophe@saout.de> | |
3 | * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org> | |
e48d4bbf | 4 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. |
1da177e4 LT |
5 | * |
6 | * This file is released under the GPL. | |
7 | */ | |
8 | ||
d1806f6a | 9 | #include <linux/err.h> |
1da177e4 LT |
10 | #include <linux/module.h> |
11 | #include <linux/init.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/bio.h> | |
14 | #include <linux/blkdev.h> | |
15 | #include <linux/mempool.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/crypto.h> | |
18 | #include <linux/workqueue.h> | |
3fcfab16 | 19 | #include <linux/backing-dev.h> |
1da177e4 | 20 | #include <asm/atomic.h> |
378f058c | 21 | #include <linux/scatterlist.h> |
1da177e4 | 22 | #include <asm/page.h> |
48527fa7 | 23 | #include <asm/unaligned.h> |
1da177e4 LT |
24 | |
25 | #include "dm.h" | |
26 | ||
72d94861 | 27 | #define DM_MSG_PREFIX "crypt" |
e48d4bbf | 28 | #define MESG_STR(x) x, sizeof(x) |
1da177e4 LT |
29 | |
30 | /* | |
31 | * per bio private data | |
32 | */ | |
33 | struct crypt_io { | |
34 | struct dm_target *target; | |
8b004457 | 35 | struct bio *base_bio; |
1da177e4 LT |
36 | struct bio *first_clone; |
37 | struct work_struct work; | |
38 | atomic_t pending; | |
39 | int error; | |
23541d2d | 40 | int post_process; |
1da177e4 LT |
41 | }; |
42 | ||
43 | /* | |
44 | * context holding the current state of a multi-part conversion | |
45 | */ | |
46 | struct convert_context { | |
47 | struct bio *bio_in; | |
48 | struct bio *bio_out; | |
49 | unsigned int offset_in; | |
50 | unsigned int offset_out; | |
51 | unsigned int idx_in; | |
52 | unsigned int idx_out; | |
53 | sector_t sector; | |
54 | int write; | |
55 | }; | |
56 | ||
57 | struct crypt_config; | |
58 | ||
59 | struct crypt_iv_operations { | |
60 | int (*ctr)(struct crypt_config *cc, struct dm_target *ti, | |
61 | const char *opts); | |
62 | void (*dtr)(struct crypt_config *cc); | |
63 | const char *(*status)(struct crypt_config *cc); | |
64 | int (*generator)(struct crypt_config *cc, u8 *iv, sector_t sector); | |
65 | }; | |
66 | ||
67 | /* | |
68 | * Crypt: maps a linear range of a block device | |
69 | * and encrypts / decrypts at the same time. | |
70 | */ | |
e48d4bbf | 71 | enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID }; |
1da177e4 LT |
72 | struct crypt_config { |
73 | struct dm_dev *dev; | |
74 | sector_t start; | |
75 | ||
76 | /* | |
77 | * pool for per bio private data and | |
78 | * for encryption buffer pages | |
79 | */ | |
80 | mempool_t *io_pool; | |
81 | mempool_t *page_pool; | |
6a24c718 | 82 | struct bio_set *bs; |
1da177e4 LT |
83 | |
84 | /* | |
85 | * crypto related data | |
86 | */ | |
87 | struct crypt_iv_operations *iv_gen_ops; | |
88 | char *iv_mode; | |
d1806f6a | 89 | struct crypto_cipher *iv_gen_private; |
1da177e4 LT |
90 | sector_t iv_offset; |
91 | unsigned int iv_size; | |
92 | ||
d1806f6a HX |
93 | char cipher[CRYPTO_MAX_ALG_NAME]; |
94 | char chainmode[CRYPTO_MAX_ALG_NAME]; | |
95 | struct crypto_blkcipher *tfm; | |
e48d4bbf | 96 | unsigned long flags; |
1da177e4 LT |
97 | unsigned int key_size; |
98 | u8 key[0]; | |
99 | }; | |
100 | ||
6a24c718 | 101 | #define MIN_IOS 16 |
1da177e4 LT |
102 | #define MIN_POOL_PAGES 32 |
103 | #define MIN_BIO_PAGES 8 | |
104 | ||
105 | static kmem_cache_t *_crypt_io_pool; | |
106 | ||
1da177e4 LT |
107 | /* |
108 | * Different IV generation algorithms: | |
109 | * | |
3c164bd8 | 110 | * plain: the initial vector is the 32-bit little-endian version of the sector |
1da177e4 LT |
111 | * number, padded with zeros if neccessary. |
112 | * | |
3c164bd8 RS |
113 | * essiv: "encrypted sector|salt initial vector", the sector number is |
114 | * encrypted with the bulk cipher using a salt as key. The salt | |
115 | * should be derived from the bulk cipher's key via hashing. | |
1da177e4 | 116 | * |
48527fa7 RS |
117 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
118 | * (needed for LRW-32-AES and possible other narrow block modes) | |
119 | * | |
1da177e4 LT |
120 | * plumb: unimplemented, see: |
121 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 | |
122 | */ | |
123 | ||
124 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, sector_t sector) | |
125 | { | |
126 | memset(iv, 0, cc->iv_size); | |
127 | *(u32 *)iv = cpu_to_le32(sector & 0xffffffff); | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
132 | static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, | |
133 | const char *opts) | |
134 | { | |
d1806f6a | 135 | struct crypto_cipher *essiv_tfm; |
35058687 HX |
136 | struct crypto_hash *hash_tfm; |
137 | struct hash_desc desc; | |
1da177e4 LT |
138 | struct scatterlist sg; |
139 | unsigned int saltsize; | |
140 | u8 *salt; | |
d1806f6a | 141 | int err; |
1da177e4 LT |
142 | |
143 | if (opts == NULL) { | |
72d94861 | 144 | ti->error = "Digest algorithm missing for ESSIV mode"; |
1da177e4 LT |
145 | return -EINVAL; |
146 | } | |
147 | ||
148 | /* Hash the cipher key with the given hash algorithm */ | |
35058687 HX |
149 | hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC); |
150 | if (IS_ERR(hash_tfm)) { | |
72d94861 | 151 | ti->error = "Error initializing ESSIV hash"; |
35058687 | 152 | return PTR_ERR(hash_tfm); |
1da177e4 LT |
153 | } |
154 | ||
35058687 | 155 | saltsize = crypto_hash_digestsize(hash_tfm); |
1da177e4 LT |
156 | salt = kmalloc(saltsize, GFP_KERNEL); |
157 | if (salt == NULL) { | |
72d94861 | 158 | ti->error = "Error kmallocing salt storage in ESSIV"; |
35058687 | 159 | crypto_free_hash(hash_tfm); |
1da177e4 LT |
160 | return -ENOMEM; |
161 | } | |
162 | ||
378f058c | 163 | sg_set_buf(&sg, cc->key, cc->key_size); |
35058687 HX |
164 | desc.tfm = hash_tfm; |
165 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
166 | err = crypto_hash_digest(&desc, &sg, cc->key_size, salt); | |
167 | crypto_free_hash(hash_tfm); | |
168 | ||
169 | if (err) { | |
170 | ti->error = "Error calculating hash in ESSIV"; | |
171 | return err; | |
172 | } | |
1da177e4 LT |
173 | |
174 | /* Setup the essiv_tfm with the given salt */ | |
d1806f6a HX |
175 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); |
176 | if (IS_ERR(essiv_tfm)) { | |
72d94861 | 177 | ti->error = "Error allocating crypto tfm for ESSIV"; |
1da177e4 | 178 | kfree(salt); |
d1806f6a | 179 | return PTR_ERR(essiv_tfm); |
1da177e4 | 180 | } |
d1806f6a HX |
181 | if (crypto_cipher_blocksize(essiv_tfm) != |
182 | crypto_blkcipher_ivsize(cc->tfm)) { | |
72d94861 | 183 | ti->error = "Block size of ESSIV cipher does " |
1da177e4 | 184 | "not match IV size of block cipher"; |
d1806f6a | 185 | crypto_free_cipher(essiv_tfm); |
1da177e4 LT |
186 | kfree(salt); |
187 | return -EINVAL; | |
188 | } | |
d1806f6a HX |
189 | err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); |
190 | if (err) { | |
72d94861 | 191 | ti->error = "Failed to set key for ESSIV cipher"; |
d1806f6a | 192 | crypto_free_cipher(essiv_tfm); |
1da177e4 | 193 | kfree(salt); |
d1806f6a | 194 | return err; |
1da177e4 LT |
195 | } |
196 | kfree(salt); | |
197 | ||
d1806f6a | 198 | cc->iv_gen_private = essiv_tfm; |
1da177e4 LT |
199 | return 0; |
200 | } | |
201 | ||
202 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) | |
203 | { | |
d1806f6a | 204 | crypto_free_cipher(cc->iv_gen_private); |
1da177e4 LT |
205 | cc->iv_gen_private = NULL; |
206 | } | |
207 | ||
208 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, sector_t sector) | |
209 | { | |
1da177e4 LT |
210 | memset(iv, 0, cc->iv_size); |
211 | *(u64 *)iv = cpu_to_le64(sector); | |
d1806f6a | 212 | crypto_cipher_encrypt_one(cc->iv_gen_private, iv, iv); |
1da177e4 LT |
213 | return 0; |
214 | } | |
215 | ||
48527fa7 RS |
216 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
217 | const char *opts) | |
218 | { | |
219 | unsigned int bs = crypto_blkcipher_blocksize(cc->tfm); | |
220 | int log = long_log2(bs); | |
221 | ||
222 | /* we need to calculate how far we must shift the sector count | |
223 | * to get the cipher block count, we use this shift in _gen */ | |
224 | ||
225 | if (1 << log != bs) { | |
226 | ti->error = "cypher blocksize is not a power of 2"; | |
227 | return -EINVAL; | |
228 | } | |
229 | ||
230 | if (log > 9) { | |
231 | ti->error = "cypher blocksize is > 512"; | |
232 | return -EINVAL; | |
233 | } | |
234 | ||
235 | cc->iv_gen_private = (void *)(9 - log); | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) | |
241 | { | |
242 | cc->iv_gen_private = NULL; | |
243 | } | |
244 | ||
245 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, sector_t sector) | |
246 | { | |
247 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ | |
248 | put_unaligned(cpu_to_be64(((u64)sector << (u32)cc->iv_gen_private) + 1), | |
249 | (__be64 *)(iv + cc->iv_size - sizeof(u64))); | |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
1da177e4 LT |
254 | static struct crypt_iv_operations crypt_iv_plain_ops = { |
255 | .generator = crypt_iv_plain_gen | |
256 | }; | |
257 | ||
258 | static struct crypt_iv_operations crypt_iv_essiv_ops = { | |
259 | .ctr = crypt_iv_essiv_ctr, | |
260 | .dtr = crypt_iv_essiv_dtr, | |
261 | .generator = crypt_iv_essiv_gen | |
262 | }; | |
263 | ||
48527fa7 RS |
264 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
265 | .ctr = crypt_iv_benbi_ctr, | |
266 | .dtr = crypt_iv_benbi_dtr, | |
267 | .generator = crypt_iv_benbi_gen | |
268 | }; | |
1da177e4 | 269 | |
858119e1 | 270 | static int |
1da177e4 LT |
271 | crypt_convert_scatterlist(struct crypt_config *cc, struct scatterlist *out, |
272 | struct scatterlist *in, unsigned int length, | |
273 | int write, sector_t sector) | |
274 | { | |
45789328 | 275 | u8 iv[cc->iv_size] __attribute__ ((aligned(__alignof__(u64)))); |
d1806f6a HX |
276 | struct blkcipher_desc desc = { |
277 | .tfm = cc->tfm, | |
278 | .info = iv, | |
279 | .flags = CRYPTO_TFM_REQ_MAY_SLEEP, | |
280 | }; | |
1da177e4 LT |
281 | int r; |
282 | ||
283 | if (cc->iv_gen_ops) { | |
284 | r = cc->iv_gen_ops->generator(cc, iv, sector); | |
285 | if (r < 0) | |
286 | return r; | |
287 | ||
288 | if (write) | |
d1806f6a | 289 | r = crypto_blkcipher_encrypt_iv(&desc, out, in, length); |
1da177e4 | 290 | else |
d1806f6a | 291 | r = crypto_blkcipher_decrypt_iv(&desc, out, in, length); |
1da177e4 LT |
292 | } else { |
293 | if (write) | |
d1806f6a | 294 | r = crypto_blkcipher_encrypt(&desc, out, in, length); |
1da177e4 | 295 | else |
d1806f6a | 296 | r = crypto_blkcipher_decrypt(&desc, out, in, length); |
1da177e4 LT |
297 | } |
298 | ||
299 | return r; | |
300 | } | |
301 | ||
302 | static void | |
303 | crypt_convert_init(struct crypt_config *cc, struct convert_context *ctx, | |
304 | struct bio *bio_out, struct bio *bio_in, | |
305 | sector_t sector, int write) | |
306 | { | |
307 | ctx->bio_in = bio_in; | |
308 | ctx->bio_out = bio_out; | |
309 | ctx->offset_in = 0; | |
310 | ctx->offset_out = 0; | |
311 | ctx->idx_in = bio_in ? bio_in->bi_idx : 0; | |
312 | ctx->idx_out = bio_out ? bio_out->bi_idx : 0; | |
313 | ctx->sector = sector + cc->iv_offset; | |
314 | ctx->write = write; | |
315 | } | |
316 | ||
317 | /* | |
318 | * Encrypt / decrypt data from one bio to another one (can be the same one) | |
319 | */ | |
320 | static int crypt_convert(struct crypt_config *cc, | |
321 | struct convert_context *ctx) | |
322 | { | |
323 | int r = 0; | |
324 | ||
325 | while(ctx->idx_in < ctx->bio_in->bi_vcnt && | |
326 | ctx->idx_out < ctx->bio_out->bi_vcnt) { | |
327 | struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in); | |
328 | struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out); | |
329 | struct scatterlist sg_in = { | |
330 | .page = bv_in->bv_page, | |
331 | .offset = bv_in->bv_offset + ctx->offset_in, | |
332 | .length = 1 << SECTOR_SHIFT | |
333 | }; | |
334 | struct scatterlist sg_out = { | |
335 | .page = bv_out->bv_page, | |
336 | .offset = bv_out->bv_offset + ctx->offset_out, | |
337 | .length = 1 << SECTOR_SHIFT | |
338 | }; | |
339 | ||
340 | ctx->offset_in += sg_in.length; | |
341 | if (ctx->offset_in >= bv_in->bv_len) { | |
342 | ctx->offset_in = 0; | |
343 | ctx->idx_in++; | |
344 | } | |
345 | ||
346 | ctx->offset_out += sg_out.length; | |
347 | if (ctx->offset_out >= bv_out->bv_len) { | |
348 | ctx->offset_out = 0; | |
349 | ctx->idx_out++; | |
350 | } | |
351 | ||
352 | r = crypt_convert_scatterlist(cc, &sg_out, &sg_in, sg_in.length, | |
353 | ctx->write, ctx->sector); | |
354 | if (r < 0) | |
355 | break; | |
356 | ||
357 | ctx->sector++; | |
358 | } | |
359 | ||
360 | return r; | |
361 | } | |
362 | ||
6a24c718 MB |
363 | static void dm_crypt_bio_destructor(struct bio *bio) |
364 | { | |
365 | struct crypt_io *io = bio->bi_private; | |
366 | struct crypt_config *cc = io->target->private; | |
367 | ||
368 | bio_free(bio, cc->bs); | |
369 | } | |
370 | ||
1da177e4 LT |
371 | /* |
372 | * Generate a new unfragmented bio with the given size | |
373 | * This should never violate the device limitations | |
374 | * May return a smaller bio when running out of pages | |
375 | */ | |
376 | static struct bio * | |
377 | crypt_alloc_buffer(struct crypt_config *cc, unsigned int size, | |
378 | struct bio *base_bio, unsigned int *bio_vec_idx) | |
379 | { | |
8b004457 | 380 | struct bio *clone; |
1da177e4 | 381 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
b4e3ca1a | 382 | gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM; |
1da177e4 LT |
383 | unsigned int i; |
384 | ||
6a24c718 MB |
385 | if (base_bio) { |
386 | clone = bio_alloc_bioset(GFP_NOIO, base_bio->bi_max_vecs, cc->bs); | |
387 | __bio_clone(clone, base_bio); | |
388 | } else | |
389 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); | |
390 | ||
8b004457 | 391 | if (!clone) |
1da177e4 | 392 | return NULL; |
1da177e4 | 393 | |
6a24c718 MB |
394 | clone->bi_destructor = dm_crypt_bio_destructor; |
395 | ||
1da177e4 | 396 | /* if the last bio was not complete, continue where that one ended */ |
8b004457 MB |
397 | clone->bi_idx = *bio_vec_idx; |
398 | clone->bi_vcnt = *bio_vec_idx; | |
399 | clone->bi_size = 0; | |
400 | clone->bi_flags &= ~(1 << BIO_SEG_VALID); | |
1da177e4 | 401 | |
8b004457 MB |
402 | /* clone->bi_idx pages have already been allocated */ |
403 | size -= clone->bi_idx * PAGE_SIZE; | |
1da177e4 | 404 | |
8b004457 MB |
405 | for (i = clone->bi_idx; i < nr_iovecs; i++) { |
406 | struct bio_vec *bv = bio_iovec_idx(clone, i); | |
1da177e4 LT |
407 | |
408 | bv->bv_page = mempool_alloc(cc->page_pool, gfp_mask); | |
409 | if (!bv->bv_page) | |
410 | break; | |
411 | ||
412 | /* | |
413 | * if additional pages cannot be allocated without waiting, | |
414 | * return a partially allocated bio, the caller will then try | |
415 | * to allocate additional bios while submitting this partial bio | |
416 | */ | |
8b004457 | 417 | if ((i - clone->bi_idx) == (MIN_BIO_PAGES - 1)) |
1da177e4 LT |
418 | gfp_mask = (gfp_mask | __GFP_NOWARN) & ~__GFP_WAIT; |
419 | ||
420 | bv->bv_offset = 0; | |
421 | if (size > PAGE_SIZE) | |
422 | bv->bv_len = PAGE_SIZE; | |
423 | else | |
424 | bv->bv_len = size; | |
425 | ||
8b004457 MB |
426 | clone->bi_size += bv->bv_len; |
427 | clone->bi_vcnt++; | |
1da177e4 LT |
428 | size -= bv->bv_len; |
429 | } | |
430 | ||
8b004457 MB |
431 | if (!clone->bi_size) { |
432 | bio_put(clone); | |
1da177e4 LT |
433 | return NULL; |
434 | } | |
435 | ||
436 | /* | |
437 | * Remember the last bio_vec allocated to be able | |
438 | * to correctly continue after the splitting. | |
439 | */ | |
8b004457 | 440 | *bio_vec_idx = clone->bi_vcnt; |
1da177e4 | 441 | |
8b004457 | 442 | return clone; |
1da177e4 LT |
443 | } |
444 | ||
445 | static void crypt_free_buffer_pages(struct crypt_config *cc, | |
8b004457 | 446 | struct bio *clone, unsigned int bytes) |
1da177e4 LT |
447 | { |
448 | unsigned int i, start, end; | |
449 | struct bio_vec *bv; | |
450 | ||
451 | /* | |
452 | * This is ugly, but Jens Axboe thinks that using bi_idx in the | |
453 | * endio function is too dangerous at the moment, so I calculate the | |
454 | * correct position using bi_vcnt and bi_size. | |
455 | * The bv_offset and bv_len fields might already be modified but we | |
456 | * know that we always allocated whole pages. | |
457 | * A fix to the bi_idx issue in the kernel is in the works, so | |
458 | * we will hopefully be able to revert to the cleaner solution soon. | |
459 | */ | |
8b004457 MB |
460 | i = clone->bi_vcnt - 1; |
461 | bv = bio_iovec_idx(clone, i); | |
462 | end = (i << PAGE_SHIFT) + (bv->bv_offset + bv->bv_len) - clone->bi_size; | |
1da177e4 LT |
463 | start = end - bytes; |
464 | ||
465 | start >>= PAGE_SHIFT; | |
8b004457 MB |
466 | if (!clone->bi_size) |
467 | end = clone->bi_vcnt; | |
1da177e4 LT |
468 | else |
469 | end >>= PAGE_SHIFT; | |
470 | ||
8b004457 MB |
471 | for (i = start; i < end; i++) { |
472 | bv = bio_iovec_idx(clone, i); | |
1da177e4 LT |
473 | BUG_ON(!bv->bv_page); |
474 | mempool_free(bv->bv_page, cc->page_pool); | |
475 | bv->bv_page = NULL; | |
476 | } | |
477 | } | |
478 | ||
479 | /* | |
480 | * One of the bios was finished. Check for completion of | |
481 | * the whole request and correctly clean up the buffer. | |
482 | */ | |
483 | static void dec_pending(struct crypt_io *io, int error) | |
484 | { | |
485 | struct crypt_config *cc = (struct crypt_config *) io->target->private; | |
486 | ||
487 | if (error < 0) | |
488 | io->error = error; | |
489 | ||
490 | if (!atomic_dec_and_test(&io->pending)) | |
491 | return; | |
492 | ||
493 | if (io->first_clone) | |
494 | bio_put(io->first_clone); | |
495 | ||
8b004457 | 496 | bio_endio(io->base_bio, io->base_bio->bi_size, io->error); |
1da177e4 LT |
497 | |
498 | mempool_free(io, cc->io_pool); | |
499 | } | |
500 | ||
501 | /* | |
502 | * kcryptd: | |
503 | * | |
504 | * Needed because it would be very unwise to do decryption in an | |
23541d2d | 505 | * interrupt context. |
1da177e4 LT |
506 | */ |
507 | static struct workqueue_struct *_kcryptd_workqueue; | |
c4028958 | 508 | static void kcryptd_do_work(struct work_struct *work); |
1da177e4 | 509 | |
8b004457 | 510 | static void kcryptd_queue_io(struct crypt_io *io) |
1da177e4 | 511 | { |
c4028958 | 512 | INIT_WORK(&io->work, kcryptd_do_work); |
8b004457 MB |
513 | queue_work(_kcryptd_workqueue, &io->work); |
514 | } | |
515 | ||
516 | static int crypt_endio(struct bio *clone, unsigned int done, int error) | |
517 | { | |
518 | struct crypt_io *io = clone->bi_private; | |
519 | struct crypt_config *cc = io->target->private; | |
520 | unsigned read_io = bio_data_dir(clone) == READ; | |
521 | ||
522 | /* | |
523 | * free the processed pages, even if | |
524 | * it's only a partially completed write | |
525 | */ | |
526 | if (!read_io) | |
527 | crypt_free_buffer_pages(cc, clone, done); | |
528 | ||
23541d2d | 529 | /* keep going - not finished yet */ |
8b004457 MB |
530 | if (unlikely(clone->bi_size)) |
531 | return 1; | |
532 | ||
8b004457 MB |
533 | if (!read_io) |
534 | goto out; | |
535 | ||
536 | if (unlikely(!bio_flagged(clone, BIO_UPTODATE))) { | |
537 | error = -EIO; | |
538 | goto out; | |
539 | } | |
540 | ||
541 | bio_put(clone); | |
23541d2d | 542 | io->post_process = 1; |
8b004457 MB |
543 | kcryptd_queue_io(io); |
544 | return 0; | |
545 | ||
546 | out: | |
547 | bio_put(clone); | |
548 | dec_pending(io, error); | |
549 | return error; | |
550 | } | |
551 | ||
552 | static void clone_init(struct crypt_io *io, struct bio *clone) | |
553 | { | |
554 | struct crypt_config *cc = io->target->private; | |
555 | ||
556 | clone->bi_private = io; | |
557 | clone->bi_end_io = crypt_endio; | |
558 | clone->bi_bdev = cc->dev->bdev; | |
559 | clone->bi_rw = io->base_bio->bi_rw; | |
560 | } | |
561 | ||
23541d2d | 562 | static void process_read(struct crypt_io *io) |
8b004457 MB |
563 | { |
564 | struct crypt_config *cc = io->target->private; | |
565 | struct bio *base_bio = io->base_bio; | |
566 | struct bio *clone; | |
93e605c2 MB |
567 | sector_t sector = base_bio->bi_sector - io->target->begin; |
568 | ||
569 | atomic_inc(&io->pending); | |
8b004457 MB |
570 | |
571 | /* | |
572 | * The block layer might modify the bvec array, so always | |
573 | * copy the required bvecs because we need the original | |
574 | * one in order to decrypt the whole bio data *afterwards*. | |
575 | */ | |
6a24c718 | 576 | clone = bio_alloc_bioset(GFP_NOIO, bio_segments(base_bio), cc->bs); |
93e605c2 MB |
577 | if (unlikely(!clone)) { |
578 | dec_pending(io, -ENOMEM); | |
23541d2d | 579 | return; |
93e605c2 | 580 | } |
8b004457 MB |
581 | |
582 | clone_init(io, clone); | |
6a24c718 | 583 | clone->bi_destructor = dm_crypt_bio_destructor; |
8b004457 MB |
584 | clone->bi_idx = 0; |
585 | clone->bi_vcnt = bio_segments(base_bio); | |
586 | clone->bi_size = base_bio->bi_size; | |
93e605c2 | 587 | clone->bi_sector = cc->start + sector; |
8b004457 MB |
588 | memcpy(clone->bi_io_vec, bio_iovec(base_bio), |
589 | sizeof(struct bio_vec) * clone->bi_vcnt); | |
8b004457 | 590 | |
93e605c2 | 591 | generic_make_request(clone); |
8b004457 MB |
592 | } |
593 | ||
23541d2d | 594 | static void process_write(struct crypt_io *io) |
8b004457 MB |
595 | { |
596 | struct crypt_config *cc = io->target->private; | |
597 | struct bio *base_bio = io->base_bio; | |
598 | struct bio *clone; | |
93e605c2 MB |
599 | struct convert_context ctx; |
600 | unsigned remaining = base_bio->bi_size; | |
601 | sector_t sector = base_bio->bi_sector - io->target->begin; | |
602 | unsigned bvec_idx = 0; | |
8b004457 | 603 | |
93e605c2 | 604 | atomic_inc(&io->pending); |
8b004457 | 605 | |
93e605c2 | 606 | crypt_convert_init(cc, &ctx, NULL, base_bio, sector, 1); |
8b004457 | 607 | |
93e605c2 MB |
608 | /* |
609 | * The allocated buffers can be smaller than the whole bio, | |
610 | * so repeat the whole process until all the data can be handled. | |
611 | */ | |
612 | while (remaining) { | |
613 | clone = crypt_alloc_buffer(cc, base_bio->bi_size, | |
614 | io->first_clone, &bvec_idx); | |
23541d2d MB |
615 | if (unlikely(!clone)) { |
616 | dec_pending(io, -ENOMEM); | |
617 | return; | |
618 | } | |
93e605c2 MB |
619 | |
620 | ctx.bio_out = clone; | |
621 | ||
622 | if (unlikely(crypt_convert(cc, &ctx) < 0)) { | |
623 | crypt_free_buffer_pages(cc, clone, clone->bi_size); | |
624 | bio_put(clone); | |
23541d2d MB |
625 | dec_pending(io, -EIO); |
626 | return; | |
93e605c2 MB |
627 | } |
628 | ||
629 | clone_init(io, clone); | |
630 | clone->bi_sector = cc->start + sector; | |
631 | ||
632 | if (!io->first_clone) { | |
633 | /* | |
634 | * hold a reference to the first clone, because it | |
635 | * holds the bio_vec array and that can't be freed | |
636 | * before all other clones are released | |
637 | */ | |
638 | bio_get(clone); | |
639 | io->first_clone = clone; | |
640 | } | |
641 | ||
93e605c2 MB |
642 | remaining -= clone->bi_size; |
643 | sector += bio_sectors(clone); | |
644 | ||
23541d2d MB |
645 | /* prevent bio_put of first_clone */ |
646 | if (remaining) | |
647 | atomic_inc(&io->pending); | |
648 | ||
93e605c2 MB |
649 | generic_make_request(clone); |
650 | ||
651 | /* out of memory -> run queues */ | |
652 | if (remaining) | |
3fcfab16 | 653 | congestion_wait(bio_data_dir(clone), HZ/100); |
93e605c2 | 654 | } |
8b004457 MB |
655 | } |
656 | ||
657 | static void process_read_endio(struct crypt_io *io) | |
658 | { | |
659 | struct crypt_config *cc = io->target->private; | |
1da177e4 | 660 | struct convert_context ctx; |
1da177e4 | 661 | |
8b004457 MB |
662 | crypt_convert_init(cc, &ctx, io->base_bio, io->base_bio, |
663 | io->base_bio->bi_sector - io->target->begin, 0); | |
1da177e4 | 664 | |
8b004457 | 665 | dec_pending(io, crypt_convert(cc, &ctx)); |
1da177e4 LT |
666 | } |
667 | ||
c4028958 | 668 | static void kcryptd_do_work(struct work_struct *work) |
1da177e4 | 669 | { |
c4028958 | 670 | struct crypt_io *io = container_of(work, struct crypt_io, work); |
8b004457 | 671 | |
23541d2d MB |
672 | if (io->post_process) |
673 | process_read_endio(io); | |
674 | else if (bio_data_dir(io->base_bio) == READ) | |
675 | process_read(io); | |
676 | else | |
677 | process_write(io); | |
1da177e4 LT |
678 | } |
679 | ||
680 | /* | |
681 | * Decode key from its hex representation | |
682 | */ | |
683 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) | |
684 | { | |
685 | char buffer[3]; | |
686 | char *endp; | |
687 | unsigned int i; | |
688 | ||
689 | buffer[2] = '\0'; | |
690 | ||
8b004457 | 691 | for (i = 0; i < size; i++) { |
1da177e4 LT |
692 | buffer[0] = *hex++; |
693 | buffer[1] = *hex++; | |
694 | ||
695 | key[i] = (u8)simple_strtoul(buffer, &endp, 16); | |
696 | ||
697 | if (endp != &buffer[2]) | |
698 | return -EINVAL; | |
699 | } | |
700 | ||
701 | if (*hex != '\0') | |
702 | return -EINVAL; | |
703 | ||
704 | return 0; | |
705 | } | |
706 | ||
707 | /* | |
708 | * Encode key into its hex representation | |
709 | */ | |
710 | static void crypt_encode_key(char *hex, u8 *key, unsigned int size) | |
711 | { | |
712 | unsigned int i; | |
713 | ||
8b004457 | 714 | for (i = 0; i < size; i++) { |
1da177e4 LT |
715 | sprintf(hex, "%02x", *key); |
716 | hex += 2; | |
717 | key++; | |
718 | } | |
719 | } | |
720 | ||
e48d4bbf MB |
721 | static int crypt_set_key(struct crypt_config *cc, char *key) |
722 | { | |
723 | unsigned key_size = strlen(key) >> 1; | |
724 | ||
725 | if (cc->key_size && cc->key_size != key_size) | |
726 | return -EINVAL; | |
727 | ||
728 | cc->key_size = key_size; /* initial settings */ | |
729 | ||
730 | if ((!key_size && strcmp(key, "-")) || | |
731 | (key_size && crypt_decode_key(cc->key, key, key_size) < 0)) | |
732 | return -EINVAL; | |
733 | ||
734 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
735 | ||
736 | return 0; | |
737 | } | |
738 | ||
739 | static int crypt_wipe_key(struct crypt_config *cc) | |
740 | { | |
741 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
742 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); | |
743 | return 0; | |
744 | } | |
745 | ||
1da177e4 LT |
746 | /* |
747 | * Construct an encryption mapping: | |
748 | * <cipher> <key> <iv_offset> <dev_path> <start> | |
749 | */ | |
750 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
751 | { | |
752 | struct crypt_config *cc; | |
d1806f6a | 753 | struct crypto_blkcipher *tfm; |
1da177e4 LT |
754 | char *tmp; |
755 | char *cipher; | |
756 | char *chainmode; | |
757 | char *ivmode; | |
758 | char *ivopts; | |
1da177e4 | 759 | unsigned int key_size; |
4ee218cd | 760 | unsigned long long tmpll; |
1da177e4 LT |
761 | |
762 | if (argc != 5) { | |
72d94861 | 763 | ti->error = "Not enough arguments"; |
1da177e4 LT |
764 | return -EINVAL; |
765 | } | |
766 | ||
767 | tmp = argv[0]; | |
768 | cipher = strsep(&tmp, "-"); | |
769 | chainmode = strsep(&tmp, "-"); | |
770 | ivopts = strsep(&tmp, "-"); | |
771 | ivmode = strsep(&ivopts, ":"); | |
772 | ||
773 | if (tmp) | |
72d94861 | 774 | DMWARN("Unexpected additional cipher options"); |
1da177e4 LT |
775 | |
776 | key_size = strlen(argv[1]) >> 1; | |
777 | ||
e48d4bbf | 778 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); |
1da177e4 LT |
779 | if (cc == NULL) { |
780 | ti->error = | |
72d94861 | 781 | "Cannot allocate transparent encryption context"; |
1da177e4 LT |
782 | return -ENOMEM; |
783 | } | |
784 | ||
e48d4bbf | 785 | if (crypt_set_key(cc, argv[1])) { |
72d94861 | 786 | ti->error = "Error decoding key"; |
1da177e4 LT |
787 | goto bad1; |
788 | } | |
789 | ||
790 | /* Compatiblity mode for old dm-crypt cipher strings */ | |
791 | if (!chainmode || (strcmp(chainmode, "plain") == 0 && !ivmode)) { | |
792 | chainmode = "cbc"; | |
793 | ivmode = "plain"; | |
794 | } | |
795 | ||
d1806f6a HX |
796 | if (strcmp(chainmode, "ecb") && !ivmode) { |
797 | ti->error = "This chaining mode requires an IV mechanism"; | |
1da177e4 LT |
798 | goto bad1; |
799 | } | |
800 | ||
d1806f6a HX |
801 | if (snprintf(cc->cipher, CRYPTO_MAX_ALG_NAME, "%s(%s)", chainmode, |
802 | cipher) >= CRYPTO_MAX_ALG_NAME) { | |
803 | ti->error = "Chain mode + cipher name is too long"; | |
1da177e4 LT |
804 | goto bad1; |
805 | } | |
806 | ||
d1806f6a HX |
807 | tfm = crypto_alloc_blkcipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); |
808 | if (IS_ERR(tfm)) { | |
72d94861 | 809 | ti->error = "Error allocating crypto tfm"; |
1da177e4 LT |
810 | goto bad1; |
811 | } | |
1da177e4 | 812 | |
d1806f6a HX |
813 | strcpy(cc->cipher, cipher); |
814 | strcpy(cc->chainmode, chainmode); | |
1da177e4 LT |
815 | cc->tfm = tfm; |
816 | ||
817 | /* | |
48527fa7 | 818 | * Choose ivmode. Valid modes: "plain", "essiv:<esshash>", "benbi". |
1da177e4 LT |
819 | * See comments at iv code |
820 | */ | |
821 | ||
822 | if (ivmode == NULL) | |
823 | cc->iv_gen_ops = NULL; | |
824 | else if (strcmp(ivmode, "plain") == 0) | |
825 | cc->iv_gen_ops = &crypt_iv_plain_ops; | |
826 | else if (strcmp(ivmode, "essiv") == 0) | |
827 | cc->iv_gen_ops = &crypt_iv_essiv_ops; | |
48527fa7 RS |
828 | else if (strcmp(ivmode, "benbi") == 0) |
829 | cc->iv_gen_ops = &crypt_iv_benbi_ops; | |
1da177e4 | 830 | else { |
72d94861 | 831 | ti->error = "Invalid IV mode"; |
1da177e4 LT |
832 | goto bad2; |
833 | } | |
834 | ||
835 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr && | |
836 | cc->iv_gen_ops->ctr(cc, ti, ivopts) < 0) | |
837 | goto bad2; | |
838 | ||
d1806f6a HX |
839 | cc->iv_size = crypto_blkcipher_ivsize(tfm); |
840 | if (cc->iv_size) | |
1da177e4 | 841 | /* at least a 64 bit sector number should fit in our buffer */ |
d1806f6a | 842 | cc->iv_size = max(cc->iv_size, |
1da177e4 LT |
843 | (unsigned int)(sizeof(u64) / sizeof(u8))); |
844 | else { | |
1da177e4 | 845 | if (cc->iv_gen_ops) { |
72d94861 | 846 | DMWARN("Selected cipher does not support IVs"); |
1da177e4 LT |
847 | if (cc->iv_gen_ops->dtr) |
848 | cc->iv_gen_ops->dtr(cc); | |
849 | cc->iv_gen_ops = NULL; | |
850 | } | |
851 | } | |
852 | ||
93d2341c | 853 | cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool); |
1da177e4 | 854 | if (!cc->io_pool) { |
72d94861 | 855 | ti->error = "Cannot allocate crypt io mempool"; |
1da177e4 LT |
856 | goto bad3; |
857 | } | |
858 | ||
a19b27ce | 859 | cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0); |
1da177e4 | 860 | if (!cc->page_pool) { |
72d94861 | 861 | ti->error = "Cannot allocate page mempool"; |
1da177e4 LT |
862 | goto bad4; |
863 | } | |
864 | ||
6a24c718 MB |
865 | cc->bs = bioset_create(MIN_IOS, MIN_IOS, 4); |
866 | if (!cc->bs) { | |
867 | ti->error = "Cannot allocate crypt bioset"; | |
868 | goto bad_bs; | |
869 | } | |
870 | ||
d1806f6a | 871 | if (crypto_blkcipher_setkey(tfm, cc->key, key_size) < 0) { |
72d94861 | 872 | ti->error = "Error setting key"; |
1da177e4 LT |
873 | goto bad5; |
874 | } | |
875 | ||
4ee218cd | 876 | if (sscanf(argv[2], "%llu", &tmpll) != 1) { |
72d94861 | 877 | ti->error = "Invalid iv_offset sector"; |
1da177e4 LT |
878 | goto bad5; |
879 | } | |
4ee218cd | 880 | cc->iv_offset = tmpll; |
1da177e4 | 881 | |
4ee218cd | 882 | if (sscanf(argv[4], "%llu", &tmpll) != 1) { |
72d94861 | 883 | ti->error = "Invalid device sector"; |
1da177e4 LT |
884 | goto bad5; |
885 | } | |
4ee218cd | 886 | cc->start = tmpll; |
1da177e4 LT |
887 | |
888 | if (dm_get_device(ti, argv[3], cc->start, ti->len, | |
889 | dm_table_get_mode(ti->table), &cc->dev)) { | |
72d94861 | 890 | ti->error = "Device lookup failed"; |
1da177e4 LT |
891 | goto bad5; |
892 | } | |
893 | ||
894 | if (ivmode && cc->iv_gen_ops) { | |
895 | if (ivopts) | |
896 | *(ivopts - 1) = ':'; | |
897 | cc->iv_mode = kmalloc(strlen(ivmode) + 1, GFP_KERNEL); | |
898 | if (!cc->iv_mode) { | |
72d94861 | 899 | ti->error = "Error kmallocing iv_mode string"; |
1da177e4 LT |
900 | goto bad5; |
901 | } | |
902 | strcpy(cc->iv_mode, ivmode); | |
903 | } else | |
904 | cc->iv_mode = NULL; | |
905 | ||
906 | ti->private = cc; | |
907 | return 0; | |
908 | ||
909 | bad5: | |
6a24c718 MB |
910 | bioset_free(cc->bs); |
911 | bad_bs: | |
1da177e4 LT |
912 | mempool_destroy(cc->page_pool); |
913 | bad4: | |
914 | mempool_destroy(cc->io_pool); | |
915 | bad3: | |
916 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) | |
917 | cc->iv_gen_ops->dtr(cc); | |
918 | bad2: | |
d1806f6a | 919 | crypto_free_blkcipher(tfm); |
1da177e4 | 920 | bad1: |
9d3520a3 SR |
921 | /* Must zero key material before freeing */ |
922 | memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8)); | |
1da177e4 LT |
923 | kfree(cc); |
924 | return -EINVAL; | |
925 | } | |
926 | ||
927 | static void crypt_dtr(struct dm_target *ti) | |
928 | { | |
929 | struct crypt_config *cc = (struct crypt_config *) ti->private; | |
930 | ||
6a24c718 | 931 | bioset_free(cc->bs); |
1da177e4 LT |
932 | mempool_destroy(cc->page_pool); |
933 | mempool_destroy(cc->io_pool); | |
934 | ||
990a8baf | 935 | kfree(cc->iv_mode); |
1da177e4 LT |
936 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) |
937 | cc->iv_gen_ops->dtr(cc); | |
d1806f6a | 938 | crypto_free_blkcipher(cc->tfm); |
1da177e4 | 939 | dm_put_device(ti, cc->dev); |
9d3520a3 SR |
940 | |
941 | /* Must zero key material before freeing */ | |
942 | memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8)); | |
1da177e4 LT |
943 | kfree(cc); |
944 | } | |
945 | ||
1da177e4 LT |
946 | static int crypt_map(struct dm_target *ti, struct bio *bio, |
947 | union map_info *map_context) | |
948 | { | |
8b004457 | 949 | struct crypt_config *cc = ti->private; |
e48d4bbf | 950 | struct crypt_io *io; |
1da177e4 | 951 | |
e48d4bbf | 952 | io = mempool_alloc(cc->io_pool, GFP_NOIO); |
1da177e4 | 953 | io->target = ti; |
8b004457 | 954 | io->base_bio = bio; |
1da177e4 | 955 | io->first_clone = NULL; |
23541d2d | 956 | io->error = io->post_process = 0; |
93e605c2 | 957 | atomic_set(&io->pending, 0); |
23541d2d | 958 | kcryptd_queue_io(io); |
1da177e4 | 959 | |
23541d2d | 960 | return 0; |
1da177e4 LT |
961 | } |
962 | ||
963 | static int crypt_status(struct dm_target *ti, status_type_t type, | |
964 | char *result, unsigned int maxlen) | |
965 | { | |
966 | struct crypt_config *cc = (struct crypt_config *) ti->private; | |
1da177e4 LT |
967 | unsigned int sz = 0; |
968 | ||
969 | switch (type) { | |
970 | case STATUSTYPE_INFO: | |
971 | result[0] = '\0'; | |
972 | break; | |
973 | ||
974 | case STATUSTYPE_TABLE: | |
1da177e4 | 975 | if (cc->iv_mode) |
37af6560 CS |
976 | DMEMIT("%s-%s-%s ", cc->cipher, cc->chainmode, |
977 | cc->iv_mode); | |
1da177e4 | 978 | else |
37af6560 | 979 | DMEMIT("%s-%s ", cc->cipher, cc->chainmode); |
1da177e4 LT |
980 | |
981 | if (cc->key_size > 0) { | |
982 | if ((maxlen - sz) < ((cc->key_size << 1) + 1)) | |
983 | return -ENOMEM; | |
984 | ||
985 | crypt_encode_key(result + sz, cc->key, cc->key_size); | |
986 | sz += cc->key_size << 1; | |
987 | } else { | |
988 | if (sz >= maxlen) | |
989 | return -ENOMEM; | |
990 | result[sz++] = '-'; | |
991 | } | |
992 | ||
4ee218cd AM |
993 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
994 | cc->dev->name, (unsigned long long)cc->start); | |
1da177e4 LT |
995 | break; |
996 | } | |
997 | return 0; | |
998 | } | |
999 | ||
e48d4bbf MB |
1000 | static void crypt_postsuspend(struct dm_target *ti) |
1001 | { | |
1002 | struct crypt_config *cc = ti->private; | |
1003 | ||
1004 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1005 | } | |
1006 | ||
1007 | static int crypt_preresume(struct dm_target *ti) | |
1008 | { | |
1009 | struct crypt_config *cc = ti->private; | |
1010 | ||
1011 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { | |
1012 | DMERR("aborting resume - crypt key is not set."); | |
1013 | return -EAGAIN; | |
1014 | } | |
1015 | ||
1016 | return 0; | |
1017 | } | |
1018 | ||
1019 | static void crypt_resume(struct dm_target *ti) | |
1020 | { | |
1021 | struct crypt_config *cc = ti->private; | |
1022 | ||
1023 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1024 | } | |
1025 | ||
1026 | /* Message interface | |
1027 | * key set <key> | |
1028 | * key wipe | |
1029 | */ | |
1030 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) | |
1031 | { | |
1032 | struct crypt_config *cc = ti->private; | |
1033 | ||
1034 | if (argc < 2) | |
1035 | goto error; | |
1036 | ||
1037 | if (!strnicmp(argv[0], MESG_STR("key"))) { | |
1038 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { | |
1039 | DMWARN("not suspended during key manipulation."); | |
1040 | return -EINVAL; | |
1041 | } | |
1042 | if (argc == 3 && !strnicmp(argv[1], MESG_STR("set"))) | |
1043 | return crypt_set_key(cc, argv[2]); | |
1044 | if (argc == 2 && !strnicmp(argv[1], MESG_STR("wipe"))) | |
1045 | return crypt_wipe_key(cc); | |
1046 | } | |
1047 | ||
1048 | error: | |
1049 | DMWARN("unrecognised message received."); | |
1050 | return -EINVAL; | |
1051 | } | |
1052 | ||
1da177e4 LT |
1053 | static struct target_type crypt_target = { |
1054 | .name = "crypt", | |
23541d2d | 1055 | .version= {1, 3, 0}, |
1da177e4 LT |
1056 | .module = THIS_MODULE, |
1057 | .ctr = crypt_ctr, | |
1058 | .dtr = crypt_dtr, | |
1059 | .map = crypt_map, | |
1060 | .status = crypt_status, | |
e48d4bbf MB |
1061 | .postsuspend = crypt_postsuspend, |
1062 | .preresume = crypt_preresume, | |
1063 | .resume = crypt_resume, | |
1064 | .message = crypt_message, | |
1da177e4 LT |
1065 | }; |
1066 | ||
1067 | static int __init dm_crypt_init(void) | |
1068 | { | |
1069 | int r; | |
1070 | ||
1071 | _crypt_io_pool = kmem_cache_create("dm-crypt_io", | |
1072 | sizeof(struct crypt_io), | |
1073 | 0, 0, NULL, NULL); | |
1074 | if (!_crypt_io_pool) | |
1075 | return -ENOMEM; | |
1076 | ||
1077 | _kcryptd_workqueue = create_workqueue("kcryptd"); | |
1078 | if (!_kcryptd_workqueue) { | |
1079 | r = -ENOMEM; | |
72d94861 | 1080 | DMERR("couldn't create kcryptd"); |
1da177e4 LT |
1081 | goto bad1; |
1082 | } | |
1083 | ||
1084 | r = dm_register_target(&crypt_target); | |
1085 | if (r < 0) { | |
72d94861 | 1086 | DMERR("register failed %d", r); |
1da177e4 LT |
1087 | goto bad2; |
1088 | } | |
1089 | ||
1090 | return 0; | |
1091 | ||
1092 | bad2: | |
1093 | destroy_workqueue(_kcryptd_workqueue); | |
1094 | bad1: | |
1095 | kmem_cache_destroy(_crypt_io_pool); | |
1096 | return r; | |
1097 | } | |
1098 | ||
1099 | static void __exit dm_crypt_exit(void) | |
1100 | { | |
1101 | int r = dm_unregister_target(&crypt_target); | |
1102 | ||
1103 | if (r < 0) | |
72d94861 | 1104 | DMERR("unregister failed %d", r); |
1da177e4 LT |
1105 | |
1106 | destroy_workqueue(_kcryptd_workqueue); | |
1107 | kmem_cache_destroy(_crypt_io_pool); | |
1108 | } | |
1109 | ||
1110 | module_init(dm_crypt_init); | |
1111 | module_exit(dm_crypt_exit); | |
1112 | ||
1113 | MODULE_AUTHOR("Christophe Saout <christophe@saout.de>"); | |
1114 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); | |
1115 | MODULE_LICENSE("GPL"); |