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 work_struct work; |
37 | atomic_t pending; | |
38 | int error; | |
23541d2d | 39 | int post_process; |
1da177e4 LT |
40 | }; |
41 | ||
42 | /* | |
43 | * context holding the current state of a multi-part conversion | |
44 | */ | |
45 | struct convert_context { | |
46 | struct bio *bio_in; | |
47 | struct bio *bio_out; | |
48 | unsigned int offset_in; | |
49 | unsigned int offset_out; | |
50 | unsigned int idx_in; | |
51 | unsigned int idx_out; | |
52 | sector_t sector; | |
53 | int write; | |
54 | }; | |
55 | ||
56 | struct crypt_config; | |
57 | ||
58 | struct crypt_iv_operations { | |
59 | int (*ctr)(struct crypt_config *cc, struct dm_target *ti, | |
60 | const char *opts); | |
61 | void (*dtr)(struct crypt_config *cc); | |
62 | const char *(*status)(struct crypt_config *cc); | |
63 | int (*generator)(struct crypt_config *cc, u8 *iv, sector_t sector); | |
64 | }; | |
65 | ||
66 | /* | |
67 | * Crypt: maps a linear range of a block device | |
68 | * and encrypts / decrypts at the same time. | |
69 | */ | |
e48d4bbf | 70 | enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID }; |
1da177e4 LT |
71 | struct crypt_config { |
72 | struct dm_dev *dev; | |
73 | sector_t start; | |
74 | ||
75 | /* | |
76 | * pool for per bio private data and | |
77 | * for encryption buffer pages | |
78 | */ | |
79 | mempool_t *io_pool; | |
80 | mempool_t *page_pool; | |
6a24c718 | 81 | struct bio_set *bs; |
1da177e4 LT |
82 | |
83 | /* | |
84 | * crypto related data | |
85 | */ | |
86 | struct crypt_iv_operations *iv_gen_ops; | |
87 | char *iv_mode; | |
79066ad3 HX |
88 | union { |
89 | struct crypto_cipher *essiv_tfm; | |
90 | int benbi_shift; | |
91 | } iv_gen_private; | |
1da177e4 LT |
92 | sector_t iv_offset; |
93 | unsigned int iv_size; | |
94 | ||
d1806f6a HX |
95 | char cipher[CRYPTO_MAX_ALG_NAME]; |
96 | char chainmode[CRYPTO_MAX_ALG_NAME]; | |
97 | struct crypto_blkcipher *tfm; | |
e48d4bbf | 98 | unsigned long flags; |
1da177e4 LT |
99 | unsigned int key_size; |
100 | u8 key[0]; | |
101 | }; | |
102 | ||
6a24c718 | 103 | #define MIN_IOS 16 |
1da177e4 LT |
104 | #define MIN_POOL_PAGES 32 |
105 | #define MIN_BIO_PAGES 8 | |
106 | ||
e18b890b | 107 | static struct kmem_cache *_crypt_io_pool; |
1da177e4 | 108 | |
027581f3 OK |
109 | static void clone_init(struct crypt_io *, struct bio *); |
110 | ||
1da177e4 LT |
111 | /* |
112 | * Different IV generation algorithms: | |
113 | * | |
3c164bd8 | 114 | * plain: the initial vector is the 32-bit little-endian version of the sector |
1da177e4 LT |
115 | * number, padded with zeros if neccessary. |
116 | * | |
3c164bd8 RS |
117 | * essiv: "encrypted sector|salt initial vector", the sector number is |
118 | * encrypted with the bulk cipher using a salt as key. The salt | |
119 | * should be derived from the bulk cipher's key via hashing. | |
1da177e4 | 120 | * |
48527fa7 RS |
121 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
122 | * (needed for LRW-32-AES and possible other narrow block modes) | |
123 | * | |
1da177e4 LT |
124 | * plumb: unimplemented, see: |
125 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 | |
126 | */ | |
127 | ||
128 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, sector_t sector) | |
129 | { | |
130 | memset(iv, 0, cc->iv_size); | |
131 | *(u32 *)iv = cpu_to_le32(sector & 0xffffffff); | |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
136 | static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, | |
137 | const char *opts) | |
138 | { | |
d1806f6a | 139 | struct crypto_cipher *essiv_tfm; |
35058687 HX |
140 | struct crypto_hash *hash_tfm; |
141 | struct hash_desc desc; | |
1da177e4 LT |
142 | struct scatterlist sg; |
143 | unsigned int saltsize; | |
144 | u8 *salt; | |
d1806f6a | 145 | int err; |
1da177e4 LT |
146 | |
147 | if (opts == NULL) { | |
72d94861 | 148 | ti->error = "Digest algorithm missing for ESSIV mode"; |
1da177e4 LT |
149 | return -EINVAL; |
150 | } | |
151 | ||
152 | /* Hash the cipher key with the given hash algorithm */ | |
35058687 HX |
153 | hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC); |
154 | if (IS_ERR(hash_tfm)) { | |
72d94861 | 155 | ti->error = "Error initializing ESSIV hash"; |
35058687 | 156 | return PTR_ERR(hash_tfm); |
1da177e4 LT |
157 | } |
158 | ||
35058687 | 159 | saltsize = crypto_hash_digestsize(hash_tfm); |
1da177e4 LT |
160 | salt = kmalloc(saltsize, GFP_KERNEL); |
161 | if (salt == NULL) { | |
72d94861 | 162 | ti->error = "Error kmallocing salt storage in ESSIV"; |
35058687 | 163 | crypto_free_hash(hash_tfm); |
1da177e4 LT |
164 | return -ENOMEM; |
165 | } | |
166 | ||
378f058c | 167 | sg_set_buf(&sg, cc->key, cc->key_size); |
35058687 HX |
168 | desc.tfm = hash_tfm; |
169 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
170 | err = crypto_hash_digest(&desc, &sg, cc->key_size, salt); | |
171 | crypto_free_hash(hash_tfm); | |
172 | ||
173 | if (err) { | |
174 | ti->error = "Error calculating hash in ESSIV"; | |
175 | return err; | |
176 | } | |
1da177e4 LT |
177 | |
178 | /* Setup the essiv_tfm with the given salt */ | |
d1806f6a HX |
179 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); |
180 | if (IS_ERR(essiv_tfm)) { | |
72d94861 | 181 | ti->error = "Error allocating crypto tfm for ESSIV"; |
1da177e4 | 182 | kfree(salt); |
d1806f6a | 183 | return PTR_ERR(essiv_tfm); |
1da177e4 | 184 | } |
d1806f6a HX |
185 | if (crypto_cipher_blocksize(essiv_tfm) != |
186 | crypto_blkcipher_ivsize(cc->tfm)) { | |
72d94861 | 187 | ti->error = "Block size of ESSIV cipher does " |
1da177e4 | 188 | "not match IV size of block cipher"; |
d1806f6a | 189 | crypto_free_cipher(essiv_tfm); |
1da177e4 LT |
190 | kfree(salt); |
191 | return -EINVAL; | |
192 | } | |
d1806f6a HX |
193 | err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); |
194 | if (err) { | |
72d94861 | 195 | ti->error = "Failed to set key for ESSIV cipher"; |
d1806f6a | 196 | crypto_free_cipher(essiv_tfm); |
1da177e4 | 197 | kfree(salt); |
d1806f6a | 198 | return err; |
1da177e4 LT |
199 | } |
200 | kfree(salt); | |
201 | ||
79066ad3 | 202 | cc->iv_gen_private.essiv_tfm = essiv_tfm; |
1da177e4 LT |
203 | return 0; |
204 | } | |
205 | ||
206 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) | |
207 | { | |
79066ad3 HX |
208 | crypto_free_cipher(cc->iv_gen_private.essiv_tfm); |
209 | cc->iv_gen_private.essiv_tfm = NULL; | |
1da177e4 LT |
210 | } |
211 | ||
212 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, sector_t sector) | |
213 | { | |
1da177e4 LT |
214 | memset(iv, 0, cc->iv_size); |
215 | *(u64 *)iv = cpu_to_le64(sector); | |
79066ad3 | 216 | crypto_cipher_encrypt_one(cc->iv_gen_private.essiv_tfm, iv, iv); |
1da177e4 LT |
217 | return 0; |
218 | } | |
219 | ||
48527fa7 RS |
220 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
221 | const char *opts) | |
222 | { | |
223 | unsigned int bs = crypto_blkcipher_blocksize(cc->tfm); | |
f0d1b0b3 | 224 | int log = ilog2(bs); |
48527fa7 RS |
225 | |
226 | /* we need to calculate how far we must shift the sector count | |
227 | * to get the cipher block count, we use this shift in _gen */ | |
228 | ||
229 | if (1 << log != bs) { | |
230 | ti->error = "cypher blocksize is not a power of 2"; | |
231 | return -EINVAL; | |
232 | } | |
233 | ||
234 | if (log > 9) { | |
235 | ti->error = "cypher blocksize is > 512"; | |
236 | return -EINVAL; | |
237 | } | |
238 | ||
79066ad3 | 239 | cc->iv_gen_private.benbi_shift = 9 - log; |
48527fa7 RS |
240 | |
241 | return 0; | |
242 | } | |
243 | ||
244 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) | |
245 | { | |
48527fa7 RS |
246 | } |
247 | ||
248 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, sector_t sector) | |
249 | { | |
79066ad3 HX |
250 | __be64 val; |
251 | ||
48527fa7 | 252 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
79066ad3 HX |
253 | |
254 | val = cpu_to_be64(((u64)sector << cc->iv_gen_private.benbi_shift) + 1); | |
255 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); | |
48527fa7 | 256 | |
1da177e4 LT |
257 | return 0; |
258 | } | |
259 | ||
260 | static struct crypt_iv_operations crypt_iv_plain_ops = { | |
261 | .generator = crypt_iv_plain_gen | |
262 | }; | |
263 | ||
264 | static struct crypt_iv_operations crypt_iv_essiv_ops = { | |
265 | .ctr = crypt_iv_essiv_ctr, | |
266 | .dtr = crypt_iv_essiv_dtr, | |
267 | .generator = crypt_iv_essiv_gen | |
268 | }; | |
269 | ||
48527fa7 RS |
270 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
271 | .ctr = crypt_iv_benbi_ctr, | |
272 | .dtr = crypt_iv_benbi_dtr, | |
273 | .generator = crypt_iv_benbi_gen | |
274 | }; | |
1da177e4 | 275 | |
858119e1 | 276 | static int |
1da177e4 LT |
277 | crypt_convert_scatterlist(struct crypt_config *cc, struct scatterlist *out, |
278 | struct scatterlist *in, unsigned int length, | |
279 | int write, sector_t sector) | |
280 | { | |
45789328 | 281 | u8 iv[cc->iv_size] __attribute__ ((aligned(__alignof__(u64)))); |
d1806f6a HX |
282 | struct blkcipher_desc desc = { |
283 | .tfm = cc->tfm, | |
284 | .info = iv, | |
285 | .flags = CRYPTO_TFM_REQ_MAY_SLEEP, | |
286 | }; | |
1da177e4 LT |
287 | int r; |
288 | ||
289 | if (cc->iv_gen_ops) { | |
290 | r = cc->iv_gen_ops->generator(cc, iv, sector); | |
291 | if (r < 0) | |
292 | return r; | |
293 | ||
294 | if (write) | |
d1806f6a | 295 | r = crypto_blkcipher_encrypt_iv(&desc, out, in, length); |
1da177e4 | 296 | else |
d1806f6a | 297 | r = crypto_blkcipher_decrypt_iv(&desc, out, in, length); |
1da177e4 LT |
298 | } else { |
299 | if (write) | |
d1806f6a | 300 | r = crypto_blkcipher_encrypt(&desc, out, in, length); |
1da177e4 | 301 | else |
d1806f6a | 302 | r = crypto_blkcipher_decrypt(&desc, out, in, length); |
1da177e4 LT |
303 | } |
304 | ||
305 | return r; | |
306 | } | |
307 | ||
308 | static void | |
309 | crypt_convert_init(struct crypt_config *cc, struct convert_context *ctx, | |
310 | struct bio *bio_out, struct bio *bio_in, | |
311 | sector_t sector, int write) | |
312 | { | |
313 | ctx->bio_in = bio_in; | |
314 | ctx->bio_out = bio_out; | |
315 | ctx->offset_in = 0; | |
316 | ctx->offset_out = 0; | |
317 | ctx->idx_in = bio_in ? bio_in->bi_idx : 0; | |
318 | ctx->idx_out = bio_out ? bio_out->bi_idx : 0; | |
319 | ctx->sector = sector + cc->iv_offset; | |
320 | ctx->write = write; | |
321 | } | |
322 | ||
323 | /* | |
324 | * Encrypt / decrypt data from one bio to another one (can be the same one) | |
325 | */ | |
326 | static int crypt_convert(struct crypt_config *cc, | |
327 | struct convert_context *ctx) | |
328 | { | |
329 | int r = 0; | |
330 | ||
331 | while(ctx->idx_in < ctx->bio_in->bi_vcnt && | |
332 | ctx->idx_out < ctx->bio_out->bi_vcnt) { | |
333 | struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in); | |
334 | struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out); | |
335 | struct scatterlist sg_in = { | |
336 | .page = bv_in->bv_page, | |
337 | .offset = bv_in->bv_offset + ctx->offset_in, | |
338 | .length = 1 << SECTOR_SHIFT | |
339 | }; | |
340 | struct scatterlist sg_out = { | |
341 | .page = bv_out->bv_page, | |
342 | .offset = bv_out->bv_offset + ctx->offset_out, | |
343 | .length = 1 << SECTOR_SHIFT | |
344 | }; | |
345 | ||
346 | ctx->offset_in += sg_in.length; | |
347 | if (ctx->offset_in >= bv_in->bv_len) { | |
348 | ctx->offset_in = 0; | |
349 | ctx->idx_in++; | |
350 | } | |
351 | ||
352 | ctx->offset_out += sg_out.length; | |
353 | if (ctx->offset_out >= bv_out->bv_len) { | |
354 | ctx->offset_out = 0; | |
355 | ctx->idx_out++; | |
356 | } | |
357 | ||
358 | r = crypt_convert_scatterlist(cc, &sg_out, &sg_in, sg_in.length, | |
359 | ctx->write, ctx->sector); | |
360 | if (r < 0) | |
361 | break; | |
362 | ||
363 | ctx->sector++; | |
364 | } | |
365 | ||
366 | return r; | |
367 | } | |
368 | ||
6a24c718 MB |
369 | static void dm_crypt_bio_destructor(struct bio *bio) |
370 | { | |
371 | struct crypt_io *io = bio->bi_private; | |
372 | struct crypt_config *cc = io->target->private; | |
373 | ||
374 | bio_free(bio, cc->bs); | |
375 | } | |
376 | ||
1da177e4 LT |
377 | /* |
378 | * Generate a new unfragmented bio with the given size | |
379 | * This should never violate the device limitations | |
380 | * May return a smaller bio when running out of pages | |
381 | */ | |
2f9941b6 OK |
382 | static struct bio *crypt_alloc_buffer(struct crypt_io *io, unsigned int size, |
383 | unsigned int *bio_vec_idx) | |
1da177e4 | 384 | { |
027581f3 | 385 | struct crypt_config *cc = io->target->private; |
8b004457 | 386 | struct bio *clone; |
1da177e4 | 387 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
b4e3ca1a | 388 | gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM; |
1da177e4 LT |
389 | unsigned int i; |
390 | ||
2f9941b6 | 391 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
8b004457 | 392 | if (!clone) |
1da177e4 | 393 | return NULL; |
1da177e4 | 394 | |
027581f3 | 395 | clone_init(io, clone); |
6a24c718 | 396 | |
1da177e4 | 397 | /* if the last bio was not complete, continue where that one ended */ |
8b004457 MB |
398 | clone->bi_idx = *bio_vec_idx; |
399 | clone->bi_vcnt = *bio_vec_idx; | |
400 | clone->bi_size = 0; | |
401 | clone->bi_flags &= ~(1 << BIO_SEG_VALID); | |
1da177e4 | 402 | |
8b004457 MB |
403 | /* clone->bi_idx pages have already been allocated */ |
404 | size -= clone->bi_idx * PAGE_SIZE; | |
1da177e4 | 405 | |
8b004457 MB |
406 | for (i = clone->bi_idx; i < nr_iovecs; i++) { |
407 | struct bio_vec *bv = bio_iovec_idx(clone, i); | |
1da177e4 LT |
408 | |
409 | bv->bv_page = mempool_alloc(cc->page_pool, gfp_mask); | |
410 | if (!bv->bv_page) | |
411 | break; | |
412 | ||
413 | /* | |
414 | * if additional pages cannot be allocated without waiting, | |
415 | * return a partially allocated bio, the caller will then try | |
416 | * to allocate additional bios while submitting this partial bio | |
417 | */ | |
8b004457 | 418 | if ((i - clone->bi_idx) == (MIN_BIO_PAGES - 1)) |
1da177e4 LT |
419 | gfp_mask = (gfp_mask | __GFP_NOWARN) & ~__GFP_WAIT; |
420 | ||
421 | bv->bv_offset = 0; | |
422 | if (size > PAGE_SIZE) | |
423 | bv->bv_len = PAGE_SIZE; | |
424 | else | |
425 | bv->bv_len = size; | |
426 | ||
8b004457 MB |
427 | clone->bi_size += bv->bv_len; |
428 | clone->bi_vcnt++; | |
1da177e4 LT |
429 | size -= bv->bv_len; |
430 | } | |
431 | ||
8b004457 MB |
432 | if (!clone->bi_size) { |
433 | bio_put(clone); | |
1da177e4 LT |
434 | return NULL; |
435 | } | |
436 | ||
437 | /* | |
438 | * Remember the last bio_vec allocated to be able | |
439 | * to correctly continue after the splitting. | |
440 | */ | |
8b004457 | 441 | *bio_vec_idx = clone->bi_vcnt; |
1da177e4 | 442 | |
8b004457 | 443 | return clone; |
1da177e4 LT |
444 | } |
445 | ||
446 | static void crypt_free_buffer_pages(struct crypt_config *cc, | |
8b004457 | 447 | struct bio *clone, unsigned int bytes) |
1da177e4 LT |
448 | { |
449 | unsigned int i, start, end; | |
450 | struct bio_vec *bv; | |
451 | ||
452 | /* | |
453 | * This is ugly, but Jens Axboe thinks that using bi_idx in the | |
454 | * endio function is too dangerous at the moment, so I calculate the | |
455 | * correct position using bi_vcnt and bi_size. | |
456 | * The bv_offset and bv_len fields might already be modified but we | |
457 | * know that we always allocated whole pages. | |
458 | * A fix to the bi_idx issue in the kernel is in the works, so | |
459 | * we will hopefully be able to revert to the cleaner solution soon. | |
460 | */ | |
8b004457 MB |
461 | i = clone->bi_vcnt - 1; |
462 | bv = bio_iovec_idx(clone, i); | |
463 | end = (i << PAGE_SHIFT) + (bv->bv_offset + bv->bv_len) - clone->bi_size; | |
1da177e4 LT |
464 | start = end - bytes; |
465 | ||
466 | start >>= PAGE_SHIFT; | |
8b004457 MB |
467 | if (!clone->bi_size) |
468 | end = clone->bi_vcnt; | |
1da177e4 LT |
469 | else |
470 | end >>= PAGE_SHIFT; | |
471 | ||
8b004457 MB |
472 | for (i = start; i < end; i++) { |
473 | bv = bio_iovec_idx(clone, i); | |
1da177e4 LT |
474 | BUG_ON(!bv->bv_page); |
475 | mempool_free(bv->bv_page, cc->page_pool); | |
476 | bv->bv_page = NULL; | |
477 | } | |
478 | } | |
479 | ||
480 | /* | |
481 | * One of the bios was finished. Check for completion of | |
482 | * the whole request and correctly clean up the buffer. | |
483 | */ | |
484 | static void dec_pending(struct crypt_io *io, int error) | |
485 | { | |
486 | struct crypt_config *cc = (struct crypt_config *) io->target->private; | |
487 | ||
488 | if (error < 0) | |
489 | io->error = error; | |
490 | ||
491 | if (!atomic_dec_and_test(&io->pending)) | |
492 | return; | |
493 | ||
8b004457 | 494 | bio_endio(io->base_bio, io->base_bio->bi_size, io->error); |
1da177e4 LT |
495 | |
496 | mempool_free(io, cc->io_pool); | |
497 | } | |
498 | ||
499 | /* | |
500 | * kcryptd: | |
501 | * | |
502 | * Needed because it would be very unwise to do decryption in an | |
23541d2d | 503 | * interrupt context. |
1da177e4 LT |
504 | */ |
505 | static struct workqueue_struct *_kcryptd_workqueue; | |
c4028958 | 506 | static void kcryptd_do_work(struct work_struct *work); |
1da177e4 | 507 | |
8b004457 | 508 | static void kcryptd_queue_io(struct crypt_io *io) |
1da177e4 | 509 | { |
c4028958 | 510 | INIT_WORK(&io->work, kcryptd_do_work); |
8b004457 MB |
511 | queue_work(_kcryptd_workqueue, &io->work); |
512 | } | |
513 | ||
514 | static int crypt_endio(struct bio *clone, unsigned int done, int error) | |
515 | { | |
516 | struct crypt_io *io = clone->bi_private; | |
517 | struct crypt_config *cc = io->target->private; | |
518 | unsigned read_io = bio_data_dir(clone) == READ; | |
519 | ||
520 | /* | |
521 | * free the processed pages, even if | |
522 | * it's only a partially completed write | |
523 | */ | |
524 | if (!read_io) | |
525 | crypt_free_buffer_pages(cc, clone, done); | |
526 | ||
23541d2d | 527 | /* keep going - not finished yet */ |
8b004457 MB |
528 | if (unlikely(clone->bi_size)) |
529 | return 1; | |
530 | ||
8b004457 MB |
531 | if (!read_io) |
532 | goto out; | |
533 | ||
534 | if (unlikely(!bio_flagged(clone, BIO_UPTODATE))) { | |
535 | error = -EIO; | |
536 | goto out; | |
537 | } | |
538 | ||
539 | bio_put(clone); | |
23541d2d | 540 | io->post_process = 1; |
8b004457 MB |
541 | kcryptd_queue_io(io); |
542 | return 0; | |
543 | ||
544 | out: | |
545 | bio_put(clone); | |
546 | dec_pending(io, error); | |
547 | return error; | |
548 | } | |
549 | ||
550 | static void clone_init(struct crypt_io *io, struct bio *clone) | |
551 | { | |
552 | struct crypt_config *cc = io->target->private; | |
553 | ||
554 | clone->bi_private = io; | |
555 | clone->bi_end_io = crypt_endio; | |
556 | clone->bi_bdev = cc->dev->bdev; | |
557 | clone->bi_rw = io->base_bio->bi_rw; | |
027581f3 | 558 | clone->bi_destructor = dm_crypt_bio_destructor; |
8b004457 MB |
559 | } |
560 | ||
23541d2d | 561 | static void process_read(struct crypt_io *io) |
8b004457 MB |
562 | { |
563 | struct crypt_config *cc = io->target->private; | |
564 | struct bio *base_bio = io->base_bio; | |
565 | struct bio *clone; | |
93e605c2 MB |
566 | sector_t sector = base_bio->bi_sector - io->target->begin; |
567 | ||
568 | atomic_inc(&io->pending); | |
8b004457 MB |
569 | |
570 | /* | |
571 | * The block layer might modify the bvec array, so always | |
572 | * copy the required bvecs because we need the original | |
573 | * one in order to decrypt the whole bio data *afterwards*. | |
574 | */ | |
6a24c718 | 575 | clone = bio_alloc_bioset(GFP_NOIO, bio_segments(base_bio), cc->bs); |
93e605c2 MB |
576 | if (unlikely(!clone)) { |
577 | dec_pending(io, -ENOMEM); | |
23541d2d | 578 | return; |
93e605c2 | 579 | } |
8b004457 MB |
580 | |
581 | clone_init(io, clone); | |
582 | clone->bi_idx = 0; | |
583 | clone->bi_vcnt = bio_segments(base_bio); | |
584 | clone->bi_size = base_bio->bi_size; | |
93e605c2 | 585 | clone->bi_sector = cc->start + sector; |
8b004457 MB |
586 | memcpy(clone->bi_io_vec, bio_iovec(base_bio), |
587 | sizeof(struct bio_vec) * clone->bi_vcnt); | |
8b004457 | 588 | |
93e605c2 | 589 | generic_make_request(clone); |
8b004457 MB |
590 | } |
591 | ||
23541d2d | 592 | static void process_write(struct crypt_io *io) |
8b004457 MB |
593 | { |
594 | struct crypt_config *cc = io->target->private; | |
595 | struct bio *base_bio = io->base_bio; | |
596 | struct bio *clone; | |
93e605c2 MB |
597 | struct convert_context ctx; |
598 | unsigned remaining = base_bio->bi_size; | |
599 | sector_t sector = base_bio->bi_sector - io->target->begin; | |
600 | unsigned bvec_idx = 0; | |
8b004457 | 601 | |
93e605c2 | 602 | atomic_inc(&io->pending); |
8b004457 | 603 | |
93e605c2 | 604 | crypt_convert_init(cc, &ctx, NULL, base_bio, sector, 1); |
8b004457 | 605 | |
93e605c2 MB |
606 | /* |
607 | * The allocated buffers can be smaller than the whole bio, | |
608 | * so repeat the whole process until all the data can be handled. | |
609 | */ | |
610 | while (remaining) { | |
2f9941b6 | 611 | clone = crypt_alloc_buffer(io, base_bio->bi_size, &bvec_idx); |
23541d2d MB |
612 | if (unlikely(!clone)) { |
613 | dec_pending(io, -ENOMEM); | |
614 | return; | |
615 | } | |
93e605c2 MB |
616 | |
617 | ctx.bio_out = clone; | |
618 | ||
619 | if (unlikely(crypt_convert(cc, &ctx) < 0)) { | |
620 | crypt_free_buffer_pages(cc, clone, clone->bi_size); | |
621 | bio_put(clone); | |
23541d2d MB |
622 | dec_pending(io, -EIO); |
623 | return; | |
93e605c2 MB |
624 | } |
625 | ||
93e605c2 | 626 | clone->bi_sector = cc->start + sector; |
93e605c2 MB |
627 | remaining -= clone->bi_size; |
628 | sector += bio_sectors(clone); | |
629 | ||
2f9941b6 OK |
630 | /* Grab another reference to the io struct |
631 | * before we kick off the request */ | |
23541d2d MB |
632 | if (remaining) |
633 | atomic_inc(&io->pending); | |
634 | ||
93e605c2 MB |
635 | generic_make_request(clone); |
636 | ||
98221eb7 OK |
637 | /* Do not reference clone after this - it |
638 | * may be gone already. */ | |
639 | ||
93e605c2 MB |
640 | /* out of memory -> run queues */ |
641 | if (remaining) | |
98221eb7 | 642 | congestion_wait(WRITE, HZ/100); |
93e605c2 | 643 | } |
8b004457 MB |
644 | } |
645 | ||
646 | static void process_read_endio(struct crypt_io *io) | |
647 | { | |
648 | struct crypt_config *cc = io->target->private; | |
1da177e4 | 649 | struct convert_context ctx; |
1da177e4 | 650 | |
8b004457 MB |
651 | crypt_convert_init(cc, &ctx, io->base_bio, io->base_bio, |
652 | io->base_bio->bi_sector - io->target->begin, 0); | |
1da177e4 | 653 | |
8b004457 | 654 | dec_pending(io, crypt_convert(cc, &ctx)); |
1da177e4 LT |
655 | } |
656 | ||
c4028958 | 657 | static void kcryptd_do_work(struct work_struct *work) |
1da177e4 | 658 | { |
c4028958 | 659 | struct crypt_io *io = container_of(work, struct crypt_io, work); |
8b004457 | 660 | |
23541d2d MB |
661 | if (io->post_process) |
662 | process_read_endio(io); | |
663 | else if (bio_data_dir(io->base_bio) == READ) | |
664 | process_read(io); | |
665 | else | |
666 | process_write(io); | |
1da177e4 LT |
667 | } |
668 | ||
669 | /* | |
670 | * Decode key from its hex representation | |
671 | */ | |
672 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) | |
673 | { | |
674 | char buffer[3]; | |
675 | char *endp; | |
676 | unsigned int i; | |
677 | ||
678 | buffer[2] = '\0'; | |
679 | ||
8b004457 | 680 | for (i = 0; i < size; i++) { |
1da177e4 LT |
681 | buffer[0] = *hex++; |
682 | buffer[1] = *hex++; | |
683 | ||
684 | key[i] = (u8)simple_strtoul(buffer, &endp, 16); | |
685 | ||
686 | if (endp != &buffer[2]) | |
687 | return -EINVAL; | |
688 | } | |
689 | ||
690 | if (*hex != '\0') | |
691 | return -EINVAL; | |
692 | ||
693 | return 0; | |
694 | } | |
695 | ||
696 | /* | |
697 | * Encode key into its hex representation | |
698 | */ | |
699 | static void crypt_encode_key(char *hex, u8 *key, unsigned int size) | |
700 | { | |
701 | unsigned int i; | |
702 | ||
8b004457 | 703 | for (i = 0; i < size; i++) { |
1da177e4 LT |
704 | sprintf(hex, "%02x", *key); |
705 | hex += 2; | |
706 | key++; | |
707 | } | |
708 | } | |
709 | ||
e48d4bbf MB |
710 | static int crypt_set_key(struct crypt_config *cc, char *key) |
711 | { | |
712 | unsigned key_size = strlen(key) >> 1; | |
713 | ||
714 | if (cc->key_size && cc->key_size != key_size) | |
715 | return -EINVAL; | |
716 | ||
717 | cc->key_size = key_size; /* initial settings */ | |
718 | ||
719 | if ((!key_size && strcmp(key, "-")) || | |
720 | (key_size && crypt_decode_key(cc->key, key, key_size) < 0)) | |
721 | return -EINVAL; | |
722 | ||
723 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
724 | ||
725 | return 0; | |
726 | } | |
727 | ||
728 | static int crypt_wipe_key(struct crypt_config *cc) | |
729 | { | |
730 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
731 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); | |
732 | return 0; | |
733 | } | |
734 | ||
1da177e4 LT |
735 | /* |
736 | * Construct an encryption mapping: | |
737 | * <cipher> <key> <iv_offset> <dev_path> <start> | |
738 | */ | |
739 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
740 | { | |
741 | struct crypt_config *cc; | |
d1806f6a | 742 | struct crypto_blkcipher *tfm; |
1da177e4 LT |
743 | char *tmp; |
744 | char *cipher; | |
745 | char *chainmode; | |
746 | char *ivmode; | |
747 | char *ivopts; | |
1da177e4 | 748 | unsigned int key_size; |
4ee218cd | 749 | unsigned long long tmpll; |
1da177e4 LT |
750 | |
751 | if (argc != 5) { | |
72d94861 | 752 | ti->error = "Not enough arguments"; |
1da177e4 LT |
753 | return -EINVAL; |
754 | } | |
755 | ||
756 | tmp = argv[0]; | |
757 | cipher = strsep(&tmp, "-"); | |
758 | chainmode = strsep(&tmp, "-"); | |
759 | ivopts = strsep(&tmp, "-"); | |
760 | ivmode = strsep(&ivopts, ":"); | |
761 | ||
762 | if (tmp) | |
72d94861 | 763 | DMWARN("Unexpected additional cipher options"); |
1da177e4 LT |
764 | |
765 | key_size = strlen(argv[1]) >> 1; | |
766 | ||
e48d4bbf | 767 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); |
1da177e4 LT |
768 | if (cc == NULL) { |
769 | ti->error = | |
72d94861 | 770 | "Cannot allocate transparent encryption context"; |
1da177e4 LT |
771 | return -ENOMEM; |
772 | } | |
773 | ||
e48d4bbf | 774 | if (crypt_set_key(cc, argv[1])) { |
72d94861 | 775 | ti->error = "Error decoding key"; |
1da177e4 LT |
776 | goto bad1; |
777 | } | |
778 | ||
779 | /* Compatiblity mode for old dm-crypt cipher strings */ | |
780 | if (!chainmode || (strcmp(chainmode, "plain") == 0 && !ivmode)) { | |
781 | chainmode = "cbc"; | |
782 | ivmode = "plain"; | |
783 | } | |
784 | ||
d1806f6a HX |
785 | if (strcmp(chainmode, "ecb") && !ivmode) { |
786 | ti->error = "This chaining mode requires an IV mechanism"; | |
1da177e4 LT |
787 | goto bad1; |
788 | } | |
789 | ||
d1806f6a HX |
790 | if (snprintf(cc->cipher, CRYPTO_MAX_ALG_NAME, "%s(%s)", chainmode, |
791 | cipher) >= CRYPTO_MAX_ALG_NAME) { | |
792 | ti->error = "Chain mode + cipher name is too long"; | |
1da177e4 LT |
793 | goto bad1; |
794 | } | |
795 | ||
d1806f6a HX |
796 | tfm = crypto_alloc_blkcipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); |
797 | if (IS_ERR(tfm)) { | |
72d94861 | 798 | ti->error = "Error allocating crypto tfm"; |
1da177e4 LT |
799 | goto bad1; |
800 | } | |
1da177e4 | 801 | |
d1806f6a HX |
802 | strcpy(cc->cipher, cipher); |
803 | strcpy(cc->chainmode, chainmode); | |
1da177e4 LT |
804 | cc->tfm = tfm; |
805 | ||
806 | /* | |
48527fa7 | 807 | * Choose ivmode. Valid modes: "plain", "essiv:<esshash>", "benbi". |
1da177e4 LT |
808 | * See comments at iv code |
809 | */ | |
810 | ||
811 | if (ivmode == NULL) | |
812 | cc->iv_gen_ops = NULL; | |
813 | else if (strcmp(ivmode, "plain") == 0) | |
814 | cc->iv_gen_ops = &crypt_iv_plain_ops; | |
815 | else if (strcmp(ivmode, "essiv") == 0) | |
816 | cc->iv_gen_ops = &crypt_iv_essiv_ops; | |
48527fa7 RS |
817 | else if (strcmp(ivmode, "benbi") == 0) |
818 | cc->iv_gen_ops = &crypt_iv_benbi_ops; | |
1da177e4 | 819 | else { |
72d94861 | 820 | ti->error = "Invalid IV mode"; |
1da177e4 LT |
821 | goto bad2; |
822 | } | |
823 | ||
824 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr && | |
825 | cc->iv_gen_ops->ctr(cc, ti, ivopts) < 0) | |
826 | goto bad2; | |
827 | ||
d1806f6a HX |
828 | cc->iv_size = crypto_blkcipher_ivsize(tfm); |
829 | if (cc->iv_size) | |
1da177e4 | 830 | /* at least a 64 bit sector number should fit in our buffer */ |
d1806f6a | 831 | cc->iv_size = max(cc->iv_size, |
1da177e4 LT |
832 | (unsigned int)(sizeof(u64) / sizeof(u8))); |
833 | else { | |
1da177e4 | 834 | if (cc->iv_gen_ops) { |
72d94861 | 835 | DMWARN("Selected cipher does not support IVs"); |
1da177e4 LT |
836 | if (cc->iv_gen_ops->dtr) |
837 | cc->iv_gen_ops->dtr(cc); | |
838 | cc->iv_gen_ops = NULL; | |
839 | } | |
840 | } | |
841 | ||
93d2341c | 842 | cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool); |
1da177e4 | 843 | if (!cc->io_pool) { |
72d94861 | 844 | ti->error = "Cannot allocate crypt io mempool"; |
1da177e4 LT |
845 | goto bad3; |
846 | } | |
847 | ||
a19b27ce | 848 | cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0); |
1da177e4 | 849 | if (!cc->page_pool) { |
72d94861 | 850 | ti->error = "Cannot allocate page mempool"; |
1da177e4 LT |
851 | goto bad4; |
852 | } | |
853 | ||
5972511b | 854 | cc->bs = bioset_create(MIN_IOS, MIN_IOS); |
6a24c718 MB |
855 | if (!cc->bs) { |
856 | ti->error = "Cannot allocate crypt bioset"; | |
857 | goto bad_bs; | |
858 | } | |
859 | ||
d1806f6a | 860 | if (crypto_blkcipher_setkey(tfm, cc->key, key_size) < 0) { |
72d94861 | 861 | ti->error = "Error setting key"; |
1da177e4 LT |
862 | goto bad5; |
863 | } | |
864 | ||
4ee218cd | 865 | if (sscanf(argv[2], "%llu", &tmpll) != 1) { |
72d94861 | 866 | ti->error = "Invalid iv_offset sector"; |
1da177e4 LT |
867 | goto bad5; |
868 | } | |
4ee218cd | 869 | cc->iv_offset = tmpll; |
1da177e4 | 870 | |
4ee218cd | 871 | if (sscanf(argv[4], "%llu", &tmpll) != 1) { |
72d94861 | 872 | ti->error = "Invalid device sector"; |
1da177e4 LT |
873 | goto bad5; |
874 | } | |
4ee218cd | 875 | cc->start = tmpll; |
1da177e4 LT |
876 | |
877 | if (dm_get_device(ti, argv[3], cc->start, ti->len, | |
878 | dm_table_get_mode(ti->table), &cc->dev)) { | |
72d94861 | 879 | ti->error = "Device lookup failed"; |
1da177e4 LT |
880 | goto bad5; |
881 | } | |
882 | ||
883 | if (ivmode && cc->iv_gen_ops) { | |
884 | if (ivopts) | |
885 | *(ivopts - 1) = ':'; | |
886 | cc->iv_mode = kmalloc(strlen(ivmode) + 1, GFP_KERNEL); | |
887 | if (!cc->iv_mode) { | |
72d94861 | 888 | ti->error = "Error kmallocing iv_mode string"; |
1da177e4 LT |
889 | goto bad5; |
890 | } | |
891 | strcpy(cc->iv_mode, ivmode); | |
892 | } else | |
893 | cc->iv_mode = NULL; | |
894 | ||
895 | ti->private = cc; | |
896 | return 0; | |
897 | ||
898 | bad5: | |
6a24c718 MB |
899 | bioset_free(cc->bs); |
900 | bad_bs: | |
1da177e4 LT |
901 | mempool_destroy(cc->page_pool); |
902 | bad4: | |
903 | mempool_destroy(cc->io_pool); | |
904 | bad3: | |
905 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) | |
906 | cc->iv_gen_ops->dtr(cc); | |
907 | bad2: | |
d1806f6a | 908 | crypto_free_blkcipher(tfm); |
1da177e4 | 909 | bad1: |
9d3520a3 SR |
910 | /* Must zero key material before freeing */ |
911 | memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8)); | |
1da177e4 LT |
912 | kfree(cc); |
913 | return -EINVAL; | |
914 | } | |
915 | ||
916 | static void crypt_dtr(struct dm_target *ti) | |
917 | { | |
918 | struct crypt_config *cc = (struct crypt_config *) ti->private; | |
919 | ||
6a24c718 | 920 | bioset_free(cc->bs); |
1da177e4 LT |
921 | mempool_destroy(cc->page_pool); |
922 | mempool_destroy(cc->io_pool); | |
923 | ||
990a8baf | 924 | kfree(cc->iv_mode); |
1da177e4 LT |
925 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) |
926 | cc->iv_gen_ops->dtr(cc); | |
d1806f6a | 927 | crypto_free_blkcipher(cc->tfm); |
1da177e4 | 928 | dm_put_device(ti, cc->dev); |
9d3520a3 SR |
929 | |
930 | /* Must zero key material before freeing */ | |
931 | memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8)); | |
1da177e4 LT |
932 | kfree(cc); |
933 | } | |
934 | ||
1da177e4 LT |
935 | static int crypt_map(struct dm_target *ti, struct bio *bio, |
936 | union map_info *map_context) | |
937 | { | |
8b004457 | 938 | struct crypt_config *cc = ti->private; |
e48d4bbf | 939 | struct crypt_io *io; |
1da177e4 | 940 | |
9c89f8be MB |
941 | if (bio_barrier(bio)) |
942 | return -EOPNOTSUPP; | |
943 | ||
e48d4bbf | 944 | io = mempool_alloc(cc->io_pool, GFP_NOIO); |
1da177e4 | 945 | io->target = ti; |
8b004457 | 946 | io->base_bio = bio; |
23541d2d | 947 | io->error = io->post_process = 0; |
93e605c2 | 948 | atomic_set(&io->pending, 0); |
23541d2d | 949 | kcryptd_queue_io(io); |
1da177e4 | 950 | |
d2a7ad29 | 951 | return DM_MAPIO_SUBMITTED; |
1da177e4 LT |
952 | } |
953 | ||
954 | static int crypt_status(struct dm_target *ti, status_type_t type, | |
955 | char *result, unsigned int maxlen) | |
956 | { | |
957 | struct crypt_config *cc = (struct crypt_config *) ti->private; | |
1da177e4 LT |
958 | unsigned int sz = 0; |
959 | ||
960 | switch (type) { | |
961 | case STATUSTYPE_INFO: | |
962 | result[0] = '\0'; | |
963 | break; | |
964 | ||
965 | case STATUSTYPE_TABLE: | |
1da177e4 | 966 | if (cc->iv_mode) |
37af6560 CS |
967 | DMEMIT("%s-%s-%s ", cc->cipher, cc->chainmode, |
968 | cc->iv_mode); | |
1da177e4 | 969 | else |
37af6560 | 970 | DMEMIT("%s-%s ", cc->cipher, cc->chainmode); |
1da177e4 LT |
971 | |
972 | if (cc->key_size > 0) { | |
973 | if ((maxlen - sz) < ((cc->key_size << 1) + 1)) | |
974 | return -ENOMEM; | |
975 | ||
976 | crypt_encode_key(result + sz, cc->key, cc->key_size); | |
977 | sz += cc->key_size << 1; | |
978 | } else { | |
979 | if (sz >= maxlen) | |
980 | return -ENOMEM; | |
981 | result[sz++] = '-'; | |
982 | } | |
983 | ||
4ee218cd AM |
984 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
985 | cc->dev->name, (unsigned long long)cc->start); | |
1da177e4 LT |
986 | break; |
987 | } | |
988 | return 0; | |
989 | } | |
990 | ||
e48d4bbf MB |
991 | static void crypt_postsuspend(struct dm_target *ti) |
992 | { | |
993 | struct crypt_config *cc = ti->private; | |
994 | ||
995 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
996 | } | |
997 | ||
998 | static int crypt_preresume(struct dm_target *ti) | |
999 | { | |
1000 | struct crypt_config *cc = ti->private; | |
1001 | ||
1002 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { | |
1003 | DMERR("aborting resume - crypt key is not set."); | |
1004 | return -EAGAIN; | |
1005 | } | |
1006 | ||
1007 | return 0; | |
1008 | } | |
1009 | ||
1010 | static void crypt_resume(struct dm_target *ti) | |
1011 | { | |
1012 | struct crypt_config *cc = ti->private; | |
1013 | ||
1014 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1015 | } | |
1016 | ||
1017 | /* Message interface | |
1018 | * key set <key> | |
1019 | * key wipe | |
1020 | */ | |
1021 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) | |
1022 | { | |
1023 | struct crypt_config *cc = ti->private; | |
1024 | ||
1025 | if (argc < 2) | |
1026 | goto error; | |
1027 | ||
1028 | if (!strnicmp(argv[0], MESG_STR("key"))) { | |
1029 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { | |
1030 | DMWARN("not suspended during key manipulation."); | |
1031 | return -EINVAL; | |
1032 | } | |
1033 | if (argc == 3 && !strnicmp(argv[1], MESG_STR("set"))) | |
1034 | return crypt_set_key(cc, argv[2]); | |
1035 | if (argc == 2 && !strnicmp(argv[1], MESG_STR("wipe"))) | |
1036 | return crypt_wipe_key(cc); | |
1037 | } | |
1038 | ||
1039 | error: | |
1040 | DMWARN("unrecognised message received."); | |
1041 | return -EINVAL; | |
1042 | } | |
1043 | ||
1da177e4 LT |
1044 | static struct target_type crypt_target = { |
1045 | .name = "crypt", | |
23541d2d | 1046 | .version= {1, 3, 0}, |
1da177e4 LT |
1047 | .module = THIS_MODULE, |
1048 | .ctr = crypt_ctr, | |
1049 | .dtr = crypt_dtr, | |
1050 | .map = crypt_map, | |
1051 | .status = crypt_status, | |
e48d4bbf MB |
1052 | .postsuspend = crypt_postsuspend, |
1053 | .preresume = crypt_preresume, | |
1054 | .resume = crypt_resume, | |
1055 | .message = crypt_message, | |
1da177e4 LT |
1056 | }; |
1057 | ||
1058 | static int __init dm_crypt_init(void) | |
1059 | { | |
1060 | int r; | |
1061 | ||
1062 | _crypt_io_pool = kmem_cache_create("dm-crypt_io", | |
1063 | sizeof(struct crypt_io), | |
1064 | 0, 0, NULL, NULL); | |
1065 | if (!_crypt_io_pool) | |
1066 | return -ENOMEM; | |
1067 | ||
1068 | _kcryptd_workqueue = create_workqueue("kcryptd"); | |
1069 | if (!_kcryptd_workqueue) { | |
1070 | r = -ENOMEM; | |
72d94861 | 1071 | DMERR("couldn't create kcryptd"); |
1da177e4 LT |
1072 | goto bad1; |
1073 | } | |
1074 | ||
1075 | r = dm_register_target(&crypt_target); | |
1076 | if (r < 0) { | |
72d94861 | 1077 | DMERR("register failed %d", r); |
1da177e4 LT |
1078 | goto bad2; |
1079 | } | |
1080 | ||
1081 | return 0; | |
1082 | ||
1083 | bad2: | |
1084 | destroy_workqueue(_kcryptd_workqueue); | |
1085 | bad1: | |
1086 | kmem_cache_destroy(_crypt_io_pool); | |
1087 | return r; | |
1088 | } | |
1089 | ||
1090 | static void __exit dm_crypt_exit(void) | |
1091 | { | |
1092 | int r = dm_unregister_target(&crypt_target); | |
1093 | ||
1094 | if (r < 0) | |
72d94861 | 1095 | DMERR("unregister failed %d", r); |
1da177e4 LT |
1096 | |
1097 | destroy_workqueue(_kcryptd_workqueue); | |
1098 | kmem_cache_destroy(_crypt_io_pool); | |
1099 | } | |
1100 | ||
1101 | module_init(dm_crypt_init); | |
1102 | module_exit(dm_crypt_exit); | |
1103 | ||
1104 | MODULE_AUTHOR("Christophe Saout <christophe@saout.de>"); | |
1105 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); | |
1106 | MODULE_LICENSE("GPL"); |