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; | |
79066ad3 HX |
89 | union { |
90 | struct crypto_cipher *essiv_tfm; | |
91 | int benbi_shift; | |
92 | } iv_gen_private; | |
1da177e4 LT |
93 | sector_t iv_offset; |
94 | unsigned int iv_size; | |
95 | ||
d1806f6a HX |
96 | char cipher[CRYPTO_MAX_ALG_NAME]; |
97 | char chainmode[CRYPTO_MAX_ALG_NAME]; | |
98 | struct crypto_blkcipher *tfm; | |
e48d4bbf | 99 | unsigned long flags; |
1da177e4 LT |
100 | unsigned int key_size; |
101 | u8 key[0]; | |
102 | }; | |
103 | ||
6a24c718 | 104 | #define MIN_IOS 16 |
1da177e4 LT |
105 | #define MIN_POOL_PAGES 32 |
106 | #define MIN_BIO_PAGES 8 | |
107 | ||
e18b890b | 108 | static struct kmem_cache *_crypt_io_pool; |
1da177e4 | 109 | |
1da177e4 LT |
110 | /* |
111 | * Different IV generation algorithms: | |
112 | * | |
3c164bd8 | 113 | * plain: the initial vector is the 32-bit little-endian version of the sector |
1da177e4 LT |
114 | * number, padded with zeros if neccessary. |
115 | * | |
3c164bd8 RS |
116 | * essiv: "encrypted sector|salt initial vector", the sector number is |
117 | * encrypted with the bulk cipher using a salt as key. The salt | |
118 | * should be derived from the bulk cipher's key via hashing. | |
1da177e4 | 119 | * |
48527fa7 RS |
120 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
121 | * (needed for LRW-32-AES and possible other narrow block modes) | |
122 | * | |
1da177e4 LT |
123 | * plumb: unimplemented, see: |
124 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 | |
125 | */ | |
126 | ||
127 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, sector_t sector) | |
128 | { | |
129 | memset(iv, 0, cc->iv_size); | |
130 | *(u32 *)iv = cpu_to_le32(sector & 0xffffffff); | |
131 | ||
132 | return 0; | |
133 | } | |
134 | ||
135 | static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, | |
136 | const char *opts) | |
137 | { | |
d1806f6a | 138 | struct crypto_cipher *essiv_tfm; |
35058687 HX |
139 | struct crypto_hash *hash_tfm; |
140 | struct hash_desc desc; | |
1da177e4 LT |
141 | struct scatterlist sg; |
142 | unsigned int saltsize; | |
143 | u8 *salt; | |
d1806f6a | 144 | int err; |
1da177e4 LT |
145 | |
146 | if (opts == NULL) { | |
72d94861 | 147 | ti->error = "Digest algorithm missing for ESSIV mode"; |
1da177e4 LT |
148 | return -EINVAL; |
149 | } | |
150 | ||
151 | /* Hash the cipher key with the given hash algorithm */ | |
35058687 HX |
152 | hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC); |
153 | if (IS_ERR(hash_tfm)) { | |
72d94861 | 154 | ti->error = "Error initializing ESSIV hash"; |
35058687 | 155 | return PTR_ERR(hash_tfm); |
1da177e4 LT |
156 | } |
157 | ||
35058687 | 158 | saltsize = crypto_hash_digestsize(hash_tfm); |
1da177e4 LT |
159 | salt = kmalloc(saltsize, GFP_KERNEL); |
160 | if (salt == NULL) { | |
72d94861 | 161 | ti->error = "Error kmallocing salt storage in ESSIV"; |
35058687 | 162 | crypto_free_hash(hash_tfm); |
1da177e4 LT |
163 | return -ENOMEM; |
164 | } | |
165 | ||
378f058c | 166 | sg_set_buf(&sg, cc->key, cc->key_size); |
35058687 HX |
167 | desc.tfm = hash_tfm; |
168 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
169 | err = crypto_hash_digest(&desc, &sg, cc->key_size, salt); | |
170 | crypto_free_hash(hash_tfm); | |
171 | ||
172 | if (err) { | |
173 | ti->error = "Error calculating hash in ESSIV"; | |
174 | return err; | |
175 | } | |
1da177e4 LT |
176 | |
177 | /* Setup the essiv_tfm with the given salt */ | |
d1806f6a HX |
178 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); |
179 | if (IS_ERR(essiv_tfm)) { | |
72d94861 | 180 | ti->error = "Error allocating crypto tfm for ESSIV"; |
1da177e4 | 181 | kfree(salt); |
d1806f6a | 182 | return PTR_ERR(essiv_tfm); |
1da177e4 | 183 | } |
d1806f6a HX |
184 | if (crypto_cipher_blocksize(essiv_tfm) != |
185 | crypto_blkcipher_ivsize(cc->tfm)) { | |
72d94861 | 186 | ti->error = "Block size of ESSIV cipher does " |
1da177e4 | 187 | "not match IV size of block cipher"; |
d1806f6a | 188 | crypto_free_cipher(essiv_tfm); |
1da177e4 LT |
189 | kfree(salt); |
190 | return -EINVAL; | |
191 | } | |
d1806f6a HX |
192 | err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); |
193 | if (err) { | |
72d94861 | 194 | ti->error = "Failed to set key for ESSIV cipher"; |
d1806f6a | 195 | crypto_free_cipher(essiv_tfm); |
1da177e4 | 196 | kfree(salt); |
d1806f6a | 197 | return err; |
1da177e4 LT |
198 | } |
199 | kfree(salt); | |
200 | ||
79066ad3 | 201 | cc->iv_gen_private.essiv_tfm = essiv_tfm; |
1da177e4 LT |
202 | return 0; |
203 | } | |
204 | ||
205 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) | |
206 | { | |
79066ad3 HX |
207 | crypto_free_cipher(cc->iv_gen_private.essiv_tfm); |
208 | cc->iv_gen_private.essiv_tfm = NULL; | |
1da177e4 LT |
209 | } |
210 | ||
211 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, sector_t sector) | |
212 | { | |
1da177e4 LT |
213 | memset(iv, 0, cc->iv_size); |
214 | *(u64 *)iv = cpu_to_le64(sector); | |
79066ad3 | 215 | crypto_cipher_encrypt_one(cc->iv_gen_private.essiv_tfm, iv, iv); |
1da177e4 LT |
216 | return 0; |
217 | } | |
218 | ||
48527fa7 RS |
219 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
220 | const char *opts) | |
221 | { | |
222 | unsigned int bs = crypto_blkcipher_blocksize(cc->tfm); | |
f0d1b0b3 | 223 | int log = ilog2(bs); |
48527fa7 RS |
224 | |
225 | /* we need to calculate how far we must shift the sector count | |
226 | * to get the cipher block count, we use this shift in _gen */ | |
227 | ||
228 | if (1 << log != bs) { | |
229 | ti->error = "cypher blocksize is not a power of 2"; | |
230 | return -EINVAL; | |
231 | } | |
232 | ||
233 | if (log > 9) { | |
234 | ti->error = "cypher blocksize is > 512"; | |
235 | return -EINVAL; | |
236 | } | |
237 | ||
79066ad3 | 238 | cc->iv_gen_private.benbi_shift = 9 - log; |
48527fa7 RS |
239 | |
240 | return 0; | |
241 | } | |
242 | ||
243 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) | |
244 | { | |
48527fa7 RS |
245 | } |
246 | ||
247 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, sector_t sector) | |
248 | { | |
79066ad3 HX |
249 | __be64 val; |
250 | ||
48527fa7 | 251 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
79066ad3 HX |
252 | |
253 | val = cpu_to_be64(((u64)sector << cc->iv_gen_private.benbi_shift) + 1); | |
254 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); | |
48527fa7 | 255 | |
1da177e4 LT |
256 | return 0; |
257 | } | |
258 | ||
259 | static struct crypt_iv_operations crypt_iv_plain_ops = { | |
260 | .generator = crypt_iv_plain_gen | |
261 | }; | |
262 | ||
263 | static struct crypt_iv_operations crypt_iv_essiv_ops = { | |
264 | .ctr = crypt_iv_essiv_ctr, | |
265 | .dtr = crypt_iv_essiv_dtr, | |
266 | .generator = crypt_iv_essiv_gen | |
267 | }; | |
268 | ||
48527fa7 RS |
269 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
270 | .ctr = crypt_iv_benbi_ctr, | |
271 | .dtr = crypt_iv_benbi_dtr, | |
272 | .generator = crypt_iv_benbi_gen | |
273 | }; | |
1da177e4 | 274 | |
858119e1 | 275 | static int |
1da177e4 LT |
276 | crypt_convert_scatterlist(struct crypt_config *cc, struct scatterlist *out, |
277 | struct scatterlist *in, unsigned int length, | |
278 | int write, sector_t sector) | |
279 | { | |
45789328 | 280 | u8 iv[cc->iv_size] __attribute__ ((aligned(__alignof__(u64)))); |
d1806f6a HX |
281 | struct blkcipher_desc desc = { |
282 | .tfm = cc->tfm, | |
283 | .info = iv, | |
284 | .flags = CRYPTO_TFM_REQ_MAY_SLEEP, | |
285 | }; | |
1da177e4 LT |
286 | int r; |
287 | ||
288 | if (cc->iv_gen_ops) { | |
289 | r = cc->iv_gen_ops->generator(cc, iv, sector); | |
290 | if (r < 0) | |
291 | return r; | |
292 | ||
293 | if (write) | |
d1806f6a | 294 | r = crypto_blkcipher_encrypt_iv(&desc, out, in, length); |
1da177e4 | 295 | else |
d1806f6a | 296 | r = crypto_blkcipher_decrypt_iv(&desc, out, in, length); |
1da177e4 LT |
297 | } else { |
298 | if (write) | |
d1806f6a | 299 | r = crypto_blkcipher_encrypt(&desc, out, in, length); |
1da177e4 | 300 | else |
d1806f6a | 301 | r = crypto_blkcipher_decrypt(&desc, out, in, length); |
1da177e4 LT |
302 | } |
303 | ||
304 | return r; | |
305 | } | |
306 | ||
307 | static void | |
308 | crypt_convert_init(struct crypt_config *cc, struct convert_context *ctx, | |
309 | struct bio *bio_out, struct bio *bio_in, | |
310 | sector_t sector, int write) | |
311 | { | |
312 | ctx->bio_in = bio_in; | |
313 | ctx->bio_out = bio_out; | |
314 | ctx->offset_in = 0; | |
315 | ctx->offset_out = 0; | |
316 | ctx->idx_in = bio_in ? bio_in->bi_idx : 0; | |
317 | ctx->idx_out = bio_out ? bio_out->bi_idx : 0; | |
318 | ctx->sector = sector + cc->iv_offset; | |
319 | ctx->write = write; | |
320 | } | |
321 | ||
322 | /* | |
323 | * Encrypt / decrypt data from one bio to another one (can be the same one) | |
324 | */ | |
325 | static int crypt_convert(struct crypt_config *cc, | |
326 | struct convert_context *ctx) | |
327 | { | |
328 | int r = 0; | |
329 | ||
330 | while(ctx->idx_in < ctx->bio_in->bi_vcnt && | |
331 | ctx->idx_out < ctx->bio_out->bi_vcnt) { | |
332 | struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in); | |
333 | struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out); | |
334 | struct scatterlist sg_in = { | |
335 | .page = bv_in->bv_page, | |
336 | .offset = bv_in->bv_offset + ctx->offset_in, | |
337 | .length = 1 << SECTOR_SHIFT | |
338 | }; | |
339 | struct scatterlist sg_out = { | |
340 | .page = bv_out->bv_page, | |
341 | .offset = bv_out->bv_offset + ctx->offset_out, | |
342 | .length = 1 << SECTOR_SHIFT | |
343 | }; | |
344 | ||
345 | ctx->offset_in += sg_in.length; | |
346 | if (ctx->offset_in >= bv_in->bv_len) { | |
347 | ctx->offset_in = 0; | |
348 | ctx->idx_in++; | |
349 | } | |
350 | ||
351 | ctx->offset_out += sg_out.length; | |
352 | if (ctx->offset_out >= bv_out->bv_len) { | |
353 | ctx->offset_out = 0; | |
354 | ctx->idx_out++; | |
355 | } | |
356 | ||
357 | r = crypt_convert_scatterlist(cc, &sg_out, &sg_in, sg_in.length, | |
358 | ctx->write, ctx->sector); | |
359 | if (r < 0) | |
360 | break; | |
361 | ||
362 | ctx->sector++; | |
363 | } | |
364 | ||
365 | return r; | |
366 | } | |
367 | ||
6a24c718 MB |
368 | static void dm_crypt_bio_destructor(struct bio *bio) |
369 | { | |
370 | struct crypt_io *io = bio->bi_private; | |
371 | struct crypt_config *cc = io->target->private; | |
372 | ||
373 | bio_free(bio, cc->bs); | |
374 | } | |
375 | ||
1da177e4 LT |
376 | /* |
377 | * Generate a new unfragmented bio with the given size | |
378 | * This should never violate the device limitations | |
379 | * May return a smaller bio when running out of pages | |
380 | */ | |
381 | static struct bio * | |
382 | crypt_alloc_buffer(struct crypt_config *cc, unsigned int size, | |
383 | struct bio *base_bio, unsigned int *bio_vec_idx) | |
384 | { | |
8b004457 | 385 | struct bio *clone; |
1da177e4 | 386 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
b4e3ca1a | 387 | gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM; |
1da177e4 LT |
388 | unsigned int i; |
389 | ||
6a24c718 MB |
390 | if (base_bio) { |
391 | clone = bio_alloc_bioset(GFP_NOIO, base_bio->bi_max_vecs, cc->bs); | |
392 | __bio_clone(clone, base_bio); | |
393 | } else | |
394 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); | |
395 | ||
8b004457 | 396 | if (!clone) |
1da177e4 | 397 | return NULL; |
1da177e4 | 398 | |
6a24c718 MB |
399 | clone->bi_destructor = dm_crypt_bio_destructor; |
400 | ||
1da177e4 | 401 | /* if the last bio was not complete, continue where that one ended */ |
8b004457 MB |
402 | clone->bi_idx = *bio_vec_idx; |
403 | clone->bi_vcnt = *bio_vec_idx; | |
404 | clone->bi_size = 0; | |
405 | clone->bi_flags &= ~(1 << BIO_SEG_VALID); | |
1da177e4 | 406 | |
8b004457 MB |
407 | /* clone->bi_idx pages have already been allocated */ |
408 | size -= clone->bi_idx * PAGE_SIZE; | |
1da177e4 | 409 | |
8b004457 MB |
410 | for (i = clone->bi_idx; i < nr_iovecs; i++) { |
411 | struct bio_vec *bv = bio_iovec_idx(clone, i); | |
1da177e4 LT |
412 | |
413 | bv->bv_page = mempool_alloc(cc->page_pool, gfp_mask); | |
414 | if (!bv->bv_page) | |
415 | break; | |
416 | ||
417 | /* | |
418 | * if additional pages cannot be allocated without waiting, | |
419 | * return a partially allocated bio, the caller will then try | |
420 | * to allocate additional bios while submitting this partial bio | |
421 | */ | |
8b004457 | 422 | if ((i - clone->bi_idx) == (MIN_BIO_PAGES - 1)) |
1da177e4 LT |
423 | gfp_mask = (gfp_mask | __GFP_NOWARN) & ~__GFP_WAIT; |
424 | ||
425 | bv->bv_offset = 0; | |
426 | if (size > PAGE_SIZE) | |
427 | bv->bv_len = PAGE_SIZE; | |
428 | else | |
429 | bv->bv_len = size; | |
430 | ||
8b004457 MB |
431 | clone->bi_size += bv->bv_len; |
432 | clone->bi_vcnt++; | |
1da177e4 LT |
433 | size -= bv->bv_len; |
434 | } | |
435 | ||
8b004457 MB |
436 | if (!clone->bi_size) { |
437 | bio_put(clone); | |
1da177e4 LT |
438 | return NULL; |
439 | } | |
440 | ||
441 | /* | |
442 | * Remember the last bio_vec allocated to be able | |
443 | * to correctly continue after the splitting. | |
444 | */ | |
8b004457 | 445 | *bio_vec_idx = clone->bi_vcnt; |
1da177e4 | 446 | |
8b004457 | 447 | return clone; |
1da177e4 LT |
448 | } |
449 | ||
450 | static void crypt_free_buffer_pages(struct crypt_config *cc, | |
8b004457 | 451 | struct bio *clone, unsigned int bytes) |
1da177e4 LT |
452 | { |
453 | unsigned int i, start, end; | |
454 | struct bio_vec *bv; | |
455 | ||
456 | /* | |
457 | * This is ugly, but Jens Axboe thinks that using bi_idx in the | |
458 | * endio function is too dangerous at the moment, so I calculate the | |
459 | * correct position using bi_vcnt and bi_size. | |
460 | * The bv_offset and bv_len fields might already be modified but we | |
461 | * know that we always allocated whole pages. | |
462 | * A fix to the bi_idx issue in the kernel is in the works, so | |
463 | * we will hopefully be able to revert to the cleaner solution soon. | |
464 | */ | |
8b004457 MB |
465 | i = clone->bi_vcnt - 1; |
466 | bv = bio_iovec_idx(clone, i); | |
467 | end = (i << PAGE_SHIFT) + (bv->bv_offset + bv->bv_len) - clone->bi_size; | |
1da177e4 LT |
468 | start = end - bytes; |
469 | ||
470 | start >>= PAGE_SHIFT; | |
8b004457 MB |
471 | if (!clone->bi_size) |
472 | end = clone->bi_vcnt; | |
1da177e4 LT |
473 | else |
474 | end >>= PAGE_SHIFT; | |
475 | ||
8b004457 MB |
476 | for (i = start; i < end; i++) { |
477 | bv = bio_iovec_idx(clone, i); | |
1da177e4 LT |
478 | BUG_ON(!bv->bv_page); |
479 | mempool_free(bv->bv_page, cc->page_pool); | |
480 | bv->bv_page = NULL; | |
481 | } | |
482 | } | |
483 | ||
484 | /* | |
485 | * One of the bios was finished. Check for completion of | |
486 | * the whole request and correctly clean up the buffer. | |
487 | */ | |
488 | static void dec_pending(struct crypt_io *io, int error) | |
489 | { | |
490 | struct crypt_config *cc = (struct crypt_config *) io->target->private; | |
491 | ||
492 | if (error < 0) | |
493 | io->error = error; | |
494 | ||
495 | if (!atomic_dec_and_test(&io->pending)) | |
496 | return; | |
497 | ||
498 | if (io->first_clone) | |
499 | bio_put(io->first_clone); | |
500 | ||
8b004457 | 501 | bio_endio(io->base_bio, io->base_bio->bi_size, io->error); |
1da177e4 LT |
502 | |
503 | mempool_free(io, cc->io_pool); | |
504 | } | |
505 | ||
506 | /* | |
507 | * kcryptd: | |
508 | * | |
509 | * Needed because it would be very unwise to do decryption in an | |
23541d2d | 510 | * interrupt context. |
1da177e4 LT |
511 | */ |
512 | static struct workqueue_struct *_kcryptd_workqueue; | |
c4028958 | 513 | static void kcryptd_do_work(struct work_struct *work); |
1da177e4 | 514 | |
8b004457 | 515 | static void kcryptd_queue_io(struct crypt_io *io) |
1da177e4 | 516 | { |
c4028958 | 517 | INIT_WORK(&io->work, kcryptd_do_work); |
8b004457 MB |
518 | queue_work(_kcryptd_workqueue, &io->work); |
519 | } | |
520 | ||
521 | static int crypt_endio(struct bio *clone, unsigned int done, int error) | |
522 | { | |
523 | struct crypt_io *io = clone->bi_private; | |
524 | struct crypt_config *cc = io->target->private; | |
525 | unsigned read_io = bio_data_dir(clone) == READ; | |
526 | ||
527 | /* | |
528 | * free the processed pages, even if | |
529 | * it's only a partially completed write | |
530 | */ | |
531 | if (!read_io) | |
532 | crypt_free_buffer_pages(cc, clone, done); | |
533 | ||
23541d2d | 534 | /* keep going - not finished yet */ |
8b004457 MB |
535 | if (unlikely(clone->bi_size)) |
536 | return 1; | |
537 | ||
8b004457 MB |
538 | if (!read_io) |
539 | goto out; | |
540 | ||
541 | if (unlikely(!bio_flagged(clone, BIO_UPTODATE))) { | |
542 | error = -EIO; | |
543 | goto out; | |
544 | } | |
545 | ||
546 | bio_put(clone); | |
23541d2d | 547 | io->post_process = 1; |
8b004457 MB |
548 | kcryptd_queue_io(io); |
549 | return 0; | |
550 | ||
551 | out: | |
552 | bio_put(clone); | |
553 | dec_pending(io, error); | |
554 | return error; | |
555 | } | |
556 | ||
557 | static void clone_init(struct crypt_io *io, struct bio *clone) | |
558 | { | |
559 | struct crypt_config *cc = io->target->private; | |
560 | ||
561 | clone->bi_private = io; | |
562 | clone->bi_end_io = crypt_endio; | |
563 | clone->bi_bdev = cc->dev->bdev; | |
564 | clone->bi_rw = io->base_bio->bi_rw; | |
565 | } | |
566 | ||
23541d2d | 567 | static void process_read(struct crypt_io *io) |
8b004457 MB |
568 | { |
569 | struct crypt_config *cc = io->target->private; | |
570 | struct bio *base_bio = io->base_bio; | |
571 | struct bio *clone; | |
93e605c2 MB |
572 | sector_t sector = base_bio->bi_sector - io->target->begin; |
573 | ||
574 | atomic_inc(&io->pending); | |
8b004457 MB |
575 | |
576 | /* | |
577 | * The block layer might modify the bvec array, so always | |
578 | * copy the required bvecs because we need the original | |
579 | * one in order to decrypt the whole bio data *afterwards*. | |
580 | */ | |
6a24c718 | 581 | clone = bio_alloc_bioset(GFP_NOIO, bio_segments(base_bio), cc->bs); |
93e605c2 MB |
582 | if (unlikely(!clone)) { |
583 | dec_pending(io, -ENOMEM); | |
23541d2d | 584 | return; |
93e605c2 | 585 | } |
8b004457 MB |
586 | |
587 | clone_init(io, clone); | |
6a24c718 | 588 | clone->bi_destructor = dm_crypt_bio_destructor; |
8b004457 MB |
589 | clone->bi_idx = 0; |
590 | clone->bi_vcnt = bio_segments(base_bio); | |
591 | clone->bi_size = base_bio->bi_size; | |
93e605c2 | 592 | clone->bi_sector = cc->start + sector; |
8b004457 MB |
593 | memcpy(clone->bi_io_vec, bio_iovec(base_bio), |
594 | sizeof(struct bio_vec) * clone->bi_vcnt); | |
8b004457 | 595 | |
93e605c2 | 596 | generic_make_request(clone); |
8b004457 MB |
597 | } |
598 | ||
23541d2d | 599 | static void process_write(struct crypt_io *io) |
8b004457 MB |
600 | { |
601 | struct crypt_config *cc = io->target->private; | |
602 | struct bio *base_bio = io->base_bio; | |
603 | struct bio *clone; | |
93e605c2 MB |
604 | struct convert_context ctx; |
605 | unsigned remaining = base_bio->bi_size; | |
606 | sector_t sector = base_bio->bi_sector - io->target->begin; | |
607 | unsigned bvec_idx = 0; | |
8b004457 | 608 | |
93e605c2 | 609 | atomic_inc(&io->pending); |
8b004457 | 610 | |
93e605c2 | 611 | crypt_convert_init(cc, &ctx, NULL, base_bio, sector, 1); |
8b004457 | 612 | |
93e605c2 MB |
613 | /* |
614 | * The allocated buffers can be smaller than the whole bio, | |
615 | * so repeat the whole process until all the data can be handled. | |
616 | */ | |
617 | while (remaining) { | |
618 | clone = crypt_alloc_buffer(cc, base_bio->bi_size, | |
619 | io->first_clone, &bvec_idx); | |
23541d2d MB |
620 | if (unlikely(!clone)) { |
621 | dec_pending(io, -ENOMEM); | |
622 | return; | |
623 | } | |
93e605c2 MB |
624 | |
625 | ctx.bio_out = clone; | |
626 | ||
627 | if (unlikely(crypt_convert(cc, &ctx) < 0)) { | |
628 | crypt_free_buffer_pages(cc, clone, clone->bi_size); | |
629 | bio_put(clone); | |
23541d2d MB |
630 | dec_pending(io, -EIO); |
631 | return; | |
93e605c2 MB |
632 | } |
633 | ||
634 | clone_init(io, clone); | |
635 | clone->bi_sector = cc->start + sector; | |
636 | ||
637 | if (!io->first_clone) { | |
638 | /* | |
639 | * hold a reference to the first clone, because it | |
640 | * holds the bio_vec array and that can't be freed | |
641 | * before all other clones are released | |
642 | */ | |
643 | bio_get(clone); | |
644 | io->first_clone = clone; | |
645 | } | |
646 | ||
93e605c2 MB |
647 | remaining -= clone->bi_size; |
648 | sector += bio_sectors(clone); | |
649 | ||
23541d2d MB |
650 | /* prevent bio_put of first_clone */ |
651 | if (remaining) | |
652 | atomic_inc(&io->pending); | |
653 | ||
93e605c2 MB |
654 | generic_make_request(clone); |
655 | ||
656 | /* out of memory -> run queues */ | |
657 | if (remaining) | |
3fcfab16 | 658 | congestion_wait(bio_data_dir(clone), HZ/100); |
93e605c2 | 659 | } |
8b004457 MB |
660 | } |
661 | ||
662 | static void process_read_endio(struct crypt_io *io) | |
663 | { | |
664 | struct crypt_config *cc = io->target->private; | |
1da177e4 | 665 | struct convert_context ctx; |
1da177e4 | 666 | |
8b004457 MB |
667 | crypt_convert_init(cc, &ctx, io->base_bio, io->base_bio, |
668 | io->base_bio->bi_sector - io->target->begin, 0); | |
1da177e4 | 669 | |
8b004457 | 670 | dec_pending(io, crypt_convert(cc, &ctx)); |
1da177e4 LT |
671 | } |
672 | ||
c4028958 | 673 | static void kcryptd_do_work(struct work_struct *work) |
1da177e4 | 674 | { |
c4028958 | 675 | struct crypt_io *io = container_of(work, struct crypt_io, work); |
8b004457 | 676 | |
23541d2d MB |
677 | if (io->post_process) |
678 | process_read_endio(io); | |
679 | else if (bio_data_dir(io->base_bio) == READ) | |
680 | process_read(io); | |
681 | else | |
682 | process_write(io); | |
1da177e4 LT |
683 | } |
684 | ||
685 | /* | |
686 | * Decode key from its hex representation | |
687 | */ | |
688 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) | |
689 | { | |
690 | char buffer[3]; | |
691 | char *endp; | |
692 | unsigned int i; | |
693 | ||
694 | buffer[2] = '\0'; | |
695 | ||
8b004457 | 696 | for (i = 0; i < size; i++) { |
1da177e4 LT |
697 | buffer[0] = *hex++; |
698 | buffer[1] = *hex++; | |
699 | ||
700 | key[i] = (u8)simple_strtoul(buffer, &endp, 16); | |
701 | ||
702 | if (endp != &buffer[2]) | |
703 | return -EINVAL; | |
704 | } | |
705 | ||
706 | if (*hex != '\0') | |
707 | return -EINVAL; | |
708 | ||
709 | return 0; | |
710 | } | |
711 | ||
712 | /* | |
713 | * Encode key into its hex representation | |
714 | */ | |
715 | static void crypt_encode_key(char *hex, u8 *key, unsigned int size) | |
716 | { | |
717 | unsigned int i; | |
718 | ||
8b004457 | 719 | for (i = 0; i < size; i++) { |
1da177e4 LT |
720 | sprintf(hex, "%02x", *key); |
721 | hex += 2; | |
722 | key++; | |
723 | } | |
724 | } | |
725 | ||
e48d4bbf MB |
726 | static int crypt_set_key(struct crypt_config *cc, char *key) |
727 | { | |
728 | unsigned key_size = strlen(key) >> 1; | |
729 | ||
730 | if (cc->key_size && cc->key_size != key_size) | |
731 | return -EINVAL; | |
732 | ||
733 | cc->key_size = key_size; /* initial settings */ | |
734 | ||
735 | if ((!key_size && strcmp(key, "-")) || | |
736 | (key_size && crypt_decode_key(cc->key, key, key_size) < 0)) | |
737 | return -EINVAL; | |
738 | ||
739 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
740 | ||
741 | return 0; | |
742 | } | |
743 | ||
744 | static int crypt_wipe_key(struct crypt_config *cc) | |
745 | { | |
746 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
747 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); | |
748 | return 0; | |
749 | } | |
750 | ||
1da177e4 LT |
751 | /* |
752 | * Construct an encryption mapping: | |
753 | * <cipher> <key> <iv_offset> <dev_path> <start> | |
754 | */ | |
755 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
756 | { | |
757 | struct crypt_config *cc; | |
d1806f6a | 758 | struct crypto_blkcipher *tfm; |
1da177e4 LT |
759 | char *tmp; |
760 | char *cipher; | |
761 | char *chainmode; | |
762 | char *ivmode; | |
763 | char *ivopts; | |
1da177e4 | 764 | unsigned int key_size; |
4ee218cd | 765 | unsigned long long tmpll; |
1da177e4 LT |
766 | |
767 | if (argc != 5) { | |
72d94861 | 768 | ti->error = "Not enough arguments"; |
1da177e4 LT |
769 | return -EINVAL; |
770 | } | |
771 | ||
772 | tmp = argv[0]; | |
773 | cipher = strsep(&tmp, "-"); | |
774 | chainmode = strsep(&tmp, "-"); | |
775 | ivopts = strsep(&tmp, "-"); | |
776 | ivmode = strsep(&ivopts, ":"); | |
777 | ||
778 | if (tmp) | |
72d94861 | 779 | DMWARN("Unexpected additional cipher options"); |
1da177e4 LT |
780 | |
781 | key_size = strlen(argv[1]) >> 1; | |
782 | ||
e48d4bbf | 783 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); |
1da177e4 LT |
784 | if (cc == NULL) { |
785 | ti->error = | |
72d94861 | 786 | "Cannot allocate transparent encryption context"; |
1da177e4 LT |
787 | return -ENOMEM; |
788 | } | |
789 | ||
e48d4bbf | 790 | if (crypt_set_key(cc, argv[1])) { |
72d94861 | 791 | ti->error = "Error decoding key"; |
1da177e4 LT |
792 | goto bad1; |
793 | } | |
794 | ||
795 | /* Compatiblity mode for old dm-crypt cipher strings */ | |
796 | if (!chainmode || (strcmp(chainmode, "plain") == 0 && !ivmode)) { | |
797 | chainmode = "cbc"; | |
798 | ivmode = "plain"; | |
799 | } | |
800 | ||
d1806f6a HX |
801 | if (strcmp(chainmode, "ecb") && !ivmode) { |
802 | ti->error = "This chaining mode requires an IV mechanism"; | |
1da177e4 LT |
803 | goto bad1; |
804 | } | |
805 | ||
d1806f6a HX |
806 | if (snprintf(cc->cipher, CRYPTO_MAX_ALG_NAME, "%s(%s)", chainmode, |
807 | cipher) >= CRYPTO_MAX_ALG_NAME) { | |
808 | ti->error = "Chain mode + cipher name is too long"; | |
1da177e4 LT |
809 | goto bad1; |
810 | } | |
811 | ||
d1806f6a HX |
812 | tfm = crypto_alloc_blkcipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); |
813 | if (IS_ERR(tfm)) { | |
72d94861 | 814 | ti->error = "Error allocating crypto tfm"; |
1da177e4 LT |
815 | goto bad1; |
816 | } | |
1da177e4 | 817 | |
d1806f6a HX |
818 | strcpy(cc->cipher, cipher); |
819 | strcpy(cc->chainmode, chainmode); | |
1da177e4 LT |
820 | cc->tfm = tfm; |
821 | ||
822 | /* | |
48527fa7 | 823 | * Choose ivmode. Valid modes: "plain", "essiv:<esshash>", "benbi". |
1da177e4 LT |
824 | * See comments at iv code |
825 | */ | |
826 | ||
827 | if (ivmode == NULL) | |
828 | cc->iv_gen_ops = NULL; | |
829 | else if (strcmp(ivmode, "plain") == 0) | |
830 | cc->iv_gen_ops = &crypt_iv_plain_ops; | |
831 | else if (strcmp(ivmode, "essiv") == 0) | |
832 | cc->iv_gen_ops = &crypt_iv_essiv_ops; | |
48527fa7 RS |
833 | else if (strcmp(ivmode, "benbi") == 0) |
834 | cc->iv_gen_ops = &crypt_iv_benbi_ops; | |
1da177e4 | 835 | else { |
72d94861 | 836 | ti->error = "Invalid IV mode"; |
1da177e4 LT |
837 | goto bad2; |
838 | } | |
839 | ||
840 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr && | |
841 | cc->iv_gen_ops->ctr(cc, ti, ivopts) < 0) | |
842 | goto bad2; | |
843 | ||
d1806f6a HX |
844 | cc->iv_size = crypto_blkcipher_ivsize(tfm); |
845 | if (cc->iv_size) | |
1da177e4 | 846 | /* at least a 64 bit sector number should fit in our buffer */ |
d1806f6a | 847 | cc->iv_size = max(cc->iv_size, |
1da177e4 LT |
848 | (unsigned int)(sizeof(u64) / sizeof(u8))); |
849 | else { | |
1da177e4 | 850 | if (cc->iv_gen_ops) { |
72d94861 | 851 | DMWARN("Selected cipher does not support IVs"); |
1da177e4 LT |
852 | if (cc->iv_gen_ops->dtr) |
853 | cc->iv_gen_ops->dtr(cc); | |
854 | cc->iv_gen_ops = NULL; | |
855 | } | |
856 | } | |
857 | ||
93d2341c | 858 | cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool); |
1da177e4 | 859 | if (!cc->io_pool) { |
72d94861 | 860 | ti->error = "Cannot allocate crypt io mempool"; |
1da177e4 LT |
861 | goto bad3; |
862 | } | |
863 | ||
a19b27ce | 864 | cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0); |
1da177e4 | 865 | if (!cc->page_pool) { |
72d94861 | 866 | ti->error = "Cannot allocate page mempool"; |
1da177e4 LT |
867 | goto bad4; |
868 | } | |
869 | ||
6a24c718 MB |
870 | cc->bs = bioset_create(MIN_IOS, MIN_IOS, 4); |
871 | if (!cc->bs) { | |
872 | ti->error = "Cannot allocate crypt bioset"; | |
873 | goto bad_bs; | |
874 | } | |
875 | ||
d1806f6a | 876 | if (crypto_blkcipher_setkey(tfm, cc->key, key_size) < 0) { |
72d94861 | 877 | ti->error = "Error setting key"; |
1da177e4 LT |
878 | goto bad5; |
879 | } | |
880 | ||
4ee218cd | 881 | if (sscanf(argv[2], "%llu", &tmpll) != 1) { |
72d94861 | 882 | ti->error = "Invalid iv_offset sector"; |
1da177e4 LT |
883 | goto bad5; |
884 | } | |
4ee218cd | 885 | cc->iv_offset = tmpll; |
1da177e4 | 886 | |
4ee218cd | 887 | if (sscanf(argv[4], "%llu", &tmpll) != 1) { |
72d94861 | 888 | ti->error = "Invalid device sector"; |
1da177e4 LT |
889 | goto bad5; |
890 | } | |
4ee218cd | 891 | cc->start = tmpll; |
1da177e4 LT |
892 | |
893 | if (dm_get_device(ti, argv[3], cc->start, ti->len, | |
894 | dm_table_get_mode(ti->table), &cc->dev)) { | |
72d94861 | 895 | ti->error = "Device lookup failed"; |
1da177e4 LT |
896 | goto bad5; |
897 | } | |
898 | ||
899 | if (ivmode && cc->iv_gen_ops) { | |
900 | if (ivopts) | |
901 | *(ivopts - 1) = ':'; | |
902 | cc->iv_mode = kmalloc(strlen(ivmode) + 1, GFP_KERNEL); | |
903 | if (!cc->iv_mode) { | |
72d94861 | 904 | ti->error = "Error kmallocing iv_mode string"; |
1da177e4 LT |
905 | goto bad5; |
906 | } | |
907 | strcpy(cc->iv_mode, ivmode); | |
908 | } else | |
909 | cc->iv_mode = NULL; | |
910 | ||
911 | ti->private = cc; | |
912 | return 0; | |
913 | ||
914 | bad5: | |
6a24c718 MB |
915 | bioset_free(cc->bs); |
916 | bad_bs: | |
1da177e4 LT |
917 | mempool_destroy(cc->page_pool); |
918 | bad4: | |
919 | mempool_destroy(cc->io_pool); | |
920 | bad3: | |
921 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) | |
922 | cc->iv_gen_ops->dtr(cc); | |
923 | bad2: | |
d1806f6a | 924 | crypto_free_blkcipher(tfm); |
1da177e4 | 925 | bad1: |
9d3520a3 SR |
926 | /* Must zero key material before freeing */ |
927 | memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8)); | |
1da177e4 LT |
928 | kfree(cc); |
929 | return -EINVAL; | |
930 | } | |
931 | ||
932 | static void crypt_dtr(struct dm_target *ti) | |
933 | { | |
934 | struct crypt_config *cc = (struct crypt_config *) ti->private; | |
935 | ||
6a24c718 | 936 | bioset_free(cc->bs); |
1da177e4 LT |
937 | mempool_destroy(cc->page_pool); |
938 | mempool_destroy(cc->io_pool); | |
939 | ||
990a8baf | 940 | kfree(cc->iv_mode); |
1da177e4 LT |
941 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) |
942 | cc->iv_gen_ops->dtr(cc); | |
d1806f6a | 943 | crypto_free_blkcipher(cc->tfm); |
1da177e4 | 944 | dm_put_device(ti, cc->dev); |
9d3520a3 SR |
945 | |
946 | /* Must zero key material before freeing */ | |
947 | memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8)); | |
1da177e4 LT |
948 | kfree(cc); |
949 | } | |
950 | ||
1da177e4 LT |
951 | static int crypt_map(struct dm_target *ti, struct bio *bio, |
952 | union map_info *map_context) | |
953 | { | |
8b004457 | 954 | struct crypt_config *cc = ti->private; |
e48d4bbf | 955 | struct crypt_io *io; |
1da177e4 | 956 | |
e48d4bbf | 957 | io = mempool_alloc(cc->io_pool, GFP_NOIO); |
1da177e4 | 958 | io->target = ti; |
8b004457 | 959 | io->base_bio = bio; |
1da177e4 | 960 | io->first_clone = NULL; |
23541d2d | 961 | io->error = io->post_process = 0; |
93e605c2 | 962 | atomic_set(&io->pending, 0); |
23541d2d | 963 | kcryptd_queue_io(io); |
1da177e4 | 964 | |
d2a7ad29 | 965 | return DM_MAPIO_SUBMITTED; |
1da177e4 LT |
966 | } |
967 | ||
968 | static int crypt_status(struct dm_target *ti, status_type_t type, | |
969 | char *result, unsigned int maxlen) | |
970 | { | |
971 | struct crypt_config *cc = (struct crypt_config *) ti->private; | |
1da177e4 LT |
972 | unsigned int sz = 0; |
973 | ||
974 | switch (type) { | |
975 | case STATUSTYPE_INFO: | |
976 | result[0] = '\0'; | |
977 | break; | |
978 | ||
979 | case STATUSTYPE_TABLE: | |
1da177e4 | 980 | if (cc->iv_mode) |
37af6560 CS |
981 | DMEMIT("%s-%s-%s ", cc->cipher, cc->chainmode, |
982 | cc->iv_mode); | |
1da177e4 | 983 | else |
37af6560 | 984 | DMEMIT("%s-%s ", cc->cipher, cc->chainmode); |
1da177e4 LT |
985 | |
986 | if (cc->key_size > 0) { | |
987 | if ((maxlen - sz) < ((cc->key_size << 1) + 1)) | |
988 | return -ENOMEM; | |
989 | ||
990 | crypt_encode_key(result + sz, cc->key, cc->key_size); | |
991 | sz += cc->key_size << 1; | |
992 | } else { | |
993 | if (sz >= maxlen) | |
994 | return -ENOMEM; | |
995 | result[sz++] = '-'; | |
996 | } | |
997 | ||
4ee218cd AM |
998 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
999 | cc->dev->name, (unsigned long long)cc->start); | |
1da177e4 LT |
1000 | break; |
1001 | } | |
1002 | return 0; | |
1003 | } | |
1004 | ||
e48d4bbf MB |
1005 | static void crypt_postsuspend(struct dm_target *ti) |
1006 | { | |
1007 | struct crypt_config *cc = ti->private; | |
1008 | ||
1009 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1010 | } | |
1011 | ||
1012 | static int crypt_preresume(struct dm_target *ti) | |
1013 | { | |
1014 | struct crypt_config *cc = ti->private; | |
1015 | ||
1016 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { | |
1017 | DMERR("aborting resume - crypt key is not set."); | |
1018 | return -EAGAIN; | |
1019 | } | |
1020 | ||
1021 | return 0; | |
1022 | } | |
1023 | ||
1024 | static void crypt_resume(struct dm_target *ti) | |
1025 | { | |
1026 | struct crypt_config *cc = ti->private; | |
1027 | ||
1028 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1029 | } | |
1030 | ||
1031 | /* Message interface | |
1032 | * key set <key> | |
1033 | * key wipe | |
1034 | */ | |
1035 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) | |
1036 | { | |
1037 | struct crypt_config *cc = ti->private; | |
1038 | ||
1039 | if (argc < 2) | |
1040 | goto error; | |
1041 | ||
1042 | if (!strnicmp(argv[0], MESG_STR("key"))) { | |
1043 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { | |
1044 | DMWARN("not suspended during key manipulation."); | |
1045 | return -EINVAL; | |
1046 | } | |
1047 | if (argc == 3 && !strnicmp(argv[1], MESG_STR("set"))) | |
1048 | return crypt_set_key(cc, argv[2]); | |
1049 | if (argc == 2 && !strnicmp(argv[1], MESG_STR("wipe"))) | |
1050 | return crypt_wipe_key(cc); | |
1051 | } | |
1052 | ||
1053 | error: | |
1054 | DMWARN("unrecognised message received."); | |
1055 | return -EINVAL; | |
1056 | } | |
1057 | ||
1da177e4 LT |
1058 | static struct target_type crypt_target = { |
1059 | .name = "crypt", | |
23541d2d | 1060 | .version= {1, 3, 0}, |
1da177e4 LT |
1061 | .module = THIS_MODULE, |
1062 | .ctr = crypt_ctr, | |
1063 | .dtr = crypt_dtr, | |
1064 | .map = crypt_map, | |
1065 | .status = crypt_status, | |
e48d4bbf MB |
1066 | .postsuspend = crypt_postsuspend, |
1067 | .preresume = crypt_preresume, | |
1068 | .resume = crypt_resume, | |
1069 | .message = crypt_message, | |
1da177e4 LT |
1070 | }; |
1071 | ||
1072 | static int __init dm_crypt_init(void) | |
1073 | { | |
1074 | int r; | |
1075 | ||
1076 | _crypt_io_pool = kmem_cache_create("dm-crypt_io", | |
1077 | sizeof(struct crypt_io), | |
1078 | 0, 0, NULL, NULL); | |
1079 | if (!_crypt_io_pool) | |
1080 | return -ENOMEM; | |
1081 | ||
1082 | _kcryptd_workqueue = create_workqueue("kcryptd"); | |
1083 | if (!_kcryptd_workqueue) { | |
1084 | r = -ENOMEM; | |
72d94861 | 1085 | DMERR("couldn't create kcryptd"); |
1da177e4 LT |
1086 | goto bad1; |
1087 | } | |
1088 | ||
1089 | r = dm_register_target(&crypt_target); | |
1090 | if (r < 0) { | |
72d94861 | 1091 | DMERR("register failed %d", r); |
1da177e4 LT |
1092 | goto bad2; |
1093 | } | |
1094 | ||
1095 | return 0; | |
1096 | ||
1097 | bad2: | |
1098 | destroy_workqueue(_kcryptd_workqueue); | |
1099 | bad1: | |
1100 | kmem_cache_destroy(_crypt_io_pool); | |
1101 | return r; | |
1102 | } | |
1103 | ||
1104 | static void __exit dm_crypt_exit(void) | |
1105 | { | |
1106 | int r = dm_unregister_target(&crypt_target); | |
1107 | ||
1108 | if (r < 0) | |
72d94861 | 1109 | DMERR("unregister failed %d", r); |
1da177e4 LT |
1110 | |
1111 | destroy_workqueue(_kcryptd_workqueue); | |
1112 | kmem_cache_destroy(_crypt_io_pool); | |
1113 | } | |
1114 | ||
1115 | module_init(dm_crypt_init); | |
1116 | module_exit(dm_crypt_exit); | |
1117 | ||
1118 | MODULE_AUTHOR("Christophe Saout <christophe@saout.de>"); | |
1119 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); | |
1120 | MODULE_LICENSE("GPL"); |