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Commit | Line | Data |
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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 | * | |
46b47730 LN |
124 | * null: the initial vector is always zero. Provides compatibility with |
125 | * obsolete loop_fish2 devices. Do not use for new devices. | |
126 | * | |
1da177e4 LT |
127 | * plumb: unimplemented, see: |
128 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 | |
129 | */ | |
130 | ||
131 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, sector_t sector) | |
132 | { | |
133 | memset(iv, 0, cc->iv_size); | |
134 | *(u32 *)iv = cpu_to_le32(sector & 0xffffffff); | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
139 | static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, | |
140 | const char *opts) | |
141 | { | |
d1806f6a | 142 | struct crypto_cipher *essiv_tfm; |
35058687 HX |
143 | struct crypto_hash *hash_tfm; |
144 | struct hash_desc desc; | |
1da177e4 LT |
145 | struct scatterlist sg; |
146 | unsigned int saltsize; | |
147 | u8 *salt; | |
d1806f6a | 148 | int err; |
1da177e4 LT |
149 | |
150 | if (opts == NULL) { | |
72d94861 | 151 | ti->error = "Digest algorithm missing for ESSIV mode"; |
1da177e4 LT |
152 | return -EINVAL; |
153 | } | |
154 | ||
155 | /* Hash the cipher key with the given hash algorithm */ | |
35058687 HX |
156 | hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC); |
157 | if (IS_ERR(hash_tfm)) { | |
72d94861 | 158 | ti->error = "Error initializing ESSIV hash"; |
35058687 | 159 | return PTR_ERR(hash_tfm); |
1da177e4 LT |
160 | } |
161 | ||
35058687 | 162 | saltsize = crypto_hash_digestsize(hash_tfm); |
1da177e4 LT |
163 | salt = kmalloc(saltsize, GFP_KERNEL); |
164 | if (salt == NULL) { | |
72d94861 | 165 | ti->error = "Error kmallocing salt storage in ESSIV"; |
35058687 | 166 | crypto_free_hash(hash_tfm); |
1da177e4 LT |
167 | return -ENOMEM; |
168 | } | |
169 | ||
378f058c | 170 | sg_set_buf(&sg, cc->key, cc->key_size); |
35058687 HX |
171 | desc.tfm = hash_tfm; |
172 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
173 | err = crypto_hash_digest(&desc, &sg, cc->key_size, salt); | |
174 | crypto_free_hash(hash_tfm); | |
175 | ||
176 | if (err) { | |
177 | ti->error = "Error calculating hash in ESSIV"; | |
178 | return err; | |
179 | } | |
1da177e4 LT |
180 | |
181 | /* Setup the essiv_tfm with the given salt */ | |
d1806f6a HX |
182 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); |
183 | if (IS_ERR(essiv_tfm)) { | |
72d94861 | 184 | ti->error = "Error allocating crypto tfm for ESSIV"; |
1da177e4 | 185 | kfree(salt); |
d1806f6a | 186 | return PTR_ERR(essiv_tfm); |
1da177e4 | 187 | } |
d1806f6a HX |
188 | if (crypto_cipher_blocksize(essiv_tfm) != |
189 | crypto_blkcipher_ivsize(cc->tfm)) { | |
72d94861 | 190 | ti->error = "Block size of ESSIV cipher does " |
1da177e4 | 191 | "not match IV size of block cipher"; |
d1806f6a | 192 | crypto_free_cipher(essiv_tfm); |
1da177e4 LT |
193 | kfree(salt); |
194 | return -EINVAL; | |
195 | } | |
d1806f6a HX |
196 | err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); |
197 | if (err) { | |
72d94861 | 198 | ti->error = "Failed to set key for ESSIV cipher"; |
d1806f6a | 199 | crypto_free_cipher(essiv_tfm); |
1da177e4 | 200 | kfree(salt); |
d1806f6a | 201 | return err; |
1da177e4 LT |
202 | } |
203 | kfree(salt); | |
204 | ||
79066ad3 | 205 | cc->iv_gen_private.essiv_tfm = essiv_tfm; |
1da177e4 LT |
206 | return 0; |
207 | } | |
208 | ||
209 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) | |
210 | { | |
79066ad3 HX |
211 | crypto_free_cipher(cc->iv_gen_private.essiv_tfm); |
212 | cc->iv_gen_private.essiv_tfm = NULL; | |
1da177e4 LT |
213 | } |
214 | ||
215 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, sector_t sector) | |
216 | { | |
1da177e4 LT |
217 | memset(iv, 0, cc->iv_size); |
218 | *(u64 *)iv = cpu_to_le64(sector); | |
79066ad3 | 219 | crypto_cipher_encrypt_one(cc->iv_gen_private.essiv_tfm, iv, iv); |
1da177e4 LT |
220 | return 0; |
221 | } | |
222 | ||
48527fa7 RS |
223 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
224 | const char *opts) | |
225 | { | |
226 | unsigned int bs = crypto_blkcipher_blocksize(cc->tfm); | |
f0d1b0b3 | 227 | int log = ilog2(bs); |
48527fa7 RS |
228 | |
229 | /* we need to calculate how far we must shift the sector count | |
230 | * to get the cipher block count, we use this shift in _gen */ | |
231 | ||
232 | if (1 << log != bs) { | |
233 | ti->error = "cypher blocksize is not a power of 2"; | |
234 | return -EINVAL; | |
235 | } | |
236 | ||
237 | if (log > 9) { | |
238 | ti->error = "cypher blocksize is > 512"; | |
239 | return -EINVAL; | |
240 | } | |
241 | ||
79066ad3 | 242 | cc->iv_gen_private.benbi_shift = 9 - log; |
48527fa7 RS |
243 | |
244 | return 0; | |
245 | } | |
246 | ||
247 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) | |
248 | { | |
48527fa7 RS |
249 | } |
250 | ||
251 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, sector_t sector) | |
252 | { | |
79066ad3 HX |
253 | __be64 val; |
254 | ||
48527fa7 | 255 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
79066ad3 HX |
256 | |
257 | val = cpu_to_be64(((u64)sector << cc->iv_gen_private.benbi_shift) + 1); | |
258 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); | |
48527fa7 | 259 | |
1da177e4 LT |
260 | return 0; |
261 | } | |
262 | ||
46b47730 LN |
263 | static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, sector_t sector) |
264 | { | |
265 | memset(iv, 0, cc->iv_size); | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
1da177e4 LT |
270 | static struct crypt_iv_operations crypt_iv_plain_ops = { |
271 | .generator = crypt_iv_plain_gen | |
272 | }; | |
273 | ||
274 | static struct crypt_iv_operations crypt_iv_essiv_ops = { | |
275 | .ctr = crypt_iv_essiv_ctr, | |
276 | .dtr = crypt_iv_essiv_dtr, | |
277 | .generator = crypt_iv_essiv_gen | |
278 | }; | |
279 | ||
48527fa7 RS |
280 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
281 | .ctr = crypt_iv_benbi_ctr, | |
282 | .dtr = crypt_iv_benbi_dtr, | |
283 | .generator = crypt_iv_benbi_gen | |
284 | }; | |
1da177e4 | 285 | |
46b47730 LN |
286 | static struct crypt_iv_operations crypt_iv_null_ops = { |
287 | .generator = crypt_iv_null_gen | |
288 | }; | |
289 | ||
858119e1 | 290 | static int |
1da177e4 LT |
291 | crypt_convert_scatterlist(struct crypt_config *cc, struct scatterlist *out, |
292 | struct scatterlist *in, unsigned int length, | |
293 | int write, sector_t sector) | |
294 | { | |
45789328 | 295 | u8 iv[cc->iv_size] __attribute__ ((aligned(__alignof__(u64)))); |
d1806f6a HX |
296 | struct blkcipher_desc desc = { |
297 | .tfm = cc->tfm, | |
298 | .info = iv, | |
299 | .flags = CRYPTO_TFM_REQ_MAY_SLEEP, | |
300 | }; | |
1da177e4 LT |
301 | int r; |
302 | ||
303 | if (cc->iv_gen_ops) { | |
304 | r = cc->iv_gen_ops->generator(cc, iv, sector); | |
305 | if (r < 0) | |
306 | return r; | |
307 | ||
308 | if (write) | |
d1806f6a | 309 | r = crypto_blkcipher_encrypt_iv(&desc, out, in, length); |
1da177e4 | 310 | else |
d1806f6a | 311 | r = crypto_blkcipher_decrypt_iv(&desc, out, in, length); |
1da177e4 LT |
312 | } else { |
313 | if (write) | |
d1806f6a | 314 | r = crypto_blkcipher_encrypt(&desc, out, in, length); |
1da177e4 | 315 | else |
d1806f6a | 316 | r = crypto_blkcipher_decrypt(&desc, out, in, length); |
1da177e4 LT |
317 | } |
318 | ||
319 | return r; | |
320 | } | |
321 | ||
322 | static void | |
323 | crypt_convert_init(struct crypt_config *cc, struct convert_context *ctx, | |
324 | struct bio *bio_out, struct bio *bio_in, | |
325 | sector_t sector, int write) | |
326 | { | |
327 | ctx->bio_in = bio_in; | |
328 | ctx->bio_out = bio_out; | |
329 | ctx->offset_in = 0; | |
330 | ctx->offset_out = 0; | |
331 | ctx->idx_in = bio_in ? bio_in->bi_idx : 0; | |
332 | ctx->idx_out = bio_out ? bio_out->bi_idx : 0; | |
333 | ctx->sector = sector + cc->iv_offset; | |
334 | ctx->write = write; | |
335 | } | |
336 | ||
337 | /* | |
338 | * Encrypt / decrypt data from one bio to another one (can be the same one) | |
339 | */ | |
340 | static int crypt_convert(struct crypt_config *cc, | |
341 | struct convert_context *ctx) | |
342 | { | |
343 | int r = 0; | |
344 | ||
345 | while(ctx->idx_in < ctx->bio_in->bi_vcnt && | |
346 | ctx->idx_out < ctx->bio_out->bi_vcnt) { | |
347 | struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in); | |
348 | struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out); | |
349 | struct scatterlist sg_in = { | |
350 | .page = bv_in->bv_page, | |
351 | .offset = bv_in->bv_offset + ctx->offset_in, | |
352 | .length = 1 << SECTOR_SHIFT | |
353 | }; | |
354 | struct scatterlist sg_out = { | |
355 | .page = bv_out->bv_page, | |
356 | .offset = bv_out->bv_offset + ctx->offset_out, | |
357 | .length = 1 << SECTOR_SHIFT | |
358 | }; | |
359 | ||
360 | ctx->offset_in += sg_in.length; | |
361 | if (ctx->offset_in >= bv_in->bv_len) { | |
362 | ctx->offset_in = 0; | |
363 | ctx->idx_in++; | |
364 | } | |
365 | ||
366 | ctx->offset_out += sg_out.length; | |
367 | if (ctx->offset_out >= bv_out->bv_len) { | |
368 | ctx->offset_out = 0; | |
369 | ctx->idx_out++; | |
370 | } | |
371 | ||
372 | r = crypt_convert_scatterlist(cc, &sg_out, &sg_in, sg_in.length, | |
373 | ctx->write, ctx->sector); | |
374 | if (r < 0) | |
375 | break; | |
376 | ||
377 | ctx->sector++; | |
378 | } | |
379 | ||
380 | return r; | |
381 | } | |
382 | ||
6a24c718 MB |
383 | static void dm_crypt_bio_destructor(struct bio *bio) |
384 | { | |
385 | struct crypt_io *io = bio->bi_private; | |
386 | struct crypt_config *cc = io->target->private; | |
387 | ||
388 | bio_free(bio, cc->bs); | |
389 | } | |
390 | ||
1da177e4 LT |
391 | /* |
392 | * Generate a new unfragmented bio with the given size | |
393 | * This should never violate the device limitations | |
394 | * May return a smaller bio when running out of pages | |
395 | */ | |
f97380bc | 396 | static struct bio *crypt_alloc_buffer(struct crypt_io *io, unsigned int size) |
1da177e4 | 397 | { |
027581f3 | 398 | struct crypt_config *cc = io->target->private; |
8b004457 | 399 | struct bio *clone; |
1da177e4 | 400 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
b4e3ca1a | 401 | gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM; |
1da177e4 LT |
402 | unsigned int i; |
403 | ||
2f9941b6 | 404 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
8b004457 | 405 | if (!clone) |
1da177e4 | 406 | return NULL; |
1da177e4 | 407 | |
027581f3 | 408 | clone_init(io, clone); |
6a24c718 | 409 | |
f97380bc | 410 | for (i = 0; i < nr_iovecs; i++) { |
8b004457 | 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 | */ | |
f97380bc | 422 | if (i == (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 | ||
8b004457 | 441 | return clone; |
1da177e4 LT |
442 | } |
443 | ||
444 | static void crypt_free_buffer_pages(struct crypt_config *cc, | |
8b004457 | 445 | struct bio *clone, unsigned int bytes) |
1da177e4 LT |
446 | { |
447 | unsigned int i, start, end; | |
448 | struct bio_vec *bv; | |
449 | ||
450 | /* | |
451 | * This is ugly, but Jens Axboe thinks that using bi_idx in the | |
452 | * endio function is too dangerous at the moment, so I calculate the | |
453 | * correct position using bi_vcnt and bi_size. | |
454 | * The bv_offset and bv_len fields might already be modified but we | |
455 | * know that we always allocated whole pages. | |
456 | * A fix to the bi_idx issue in the kernel is in the works, so | |
457 | * we will hopefully be able to revert to the cleaner solution soon. | |
458 | */ | |
8b004457 MB |
459 | i = clone->bi_vcnt - 1; |
460 | bv = bio_iovec_idx(clone, i); | |
461 | end = (i << PAGE_SHIFT) + (bv->bv_offset + bv->bv_len) - clone->bi_size; | |
1da177e4 LT |
462 | start = end - bytes; |
463 | ||
464 | start >>= PAGE_SHIFT; | |
8b004457 MB |
465 | if (!clone->bi_size) |
466 | end = clone->bi_vcnt; | |
1da177e4 LT |
467 | else |
468 | end >>= PAGE_SHIFT; | |
469 | ||
8b004457 MB |
470 | for (i = start; i < end; i++) { |
471 | bv = bio_iovec_idx(clone, i); | |
1da177e4 LT |
472 | BUG_ON(!bv->bv_page); |
473 | mempool_free(bv->bv_page, cc->page_pool); | |
474 | bv->bv_page = NULL; | |
475 | } | |
476 | } | |
477 | ||
478 | /* | |
479 | * One of the bios was finished. Check for completion of | |
480 | * the whole request and correctly clean up the buffer. | |
481 | */ | |
482 | static void dec_pending(struct crypt_io *io, int error) | |
483 | { | |
484 | struct crypt_config *cc = (struct crypt_config *) io->target->private; | |
485 | ||
486 | if (error < 0) | |
487 | io->error = error; | |
488 | ||
489 | if (!atomic_dec_and_test(&io->pending)) | |
490 | return; | |
491 | ||
8b004457 | 492 | bio_endio(io->base_bio, io->base_bio->bi_size, io->error); |
1da177e4 LT |
493 | |
494 | mempool_free(io, cc->io_pool); | |
495 | } | |
496 | ||
497 | /* | |
498 | * kcryptd: | |
499 | * | |
500 | * Needed because it would be very unwise to do decryption in an | |
23541d2d | 501 | * interrupt context. |
1da177e4 LT |
502 | */ |
503 | static struct workqueue_struct *_kcryptd_workqueue; | |
c4028958 | 504 | static void kcryptd_do_work(struct work_struct *work); |
1da177e4 | 505 | |
8b004457 | 506 | static void kcryptd_queue_io(struct crypt_io *io) |
1da177e4 | 507 | { |
c4028958 | 508 | INIT_WORK(&io->work, kcryptd_do_work); |
8b004457 MB |
509 | queue_work(_kcryptd_workqueue, &io->work); |
510 | } | |
511 | ||
512 | static int crypt_endio(struct bio *clone, unsigned int done, int error) | |
513 | { | |
514 | struct crypt_io *io = clone->bi_private; | |
515 | struct crypt_config *cc = io->target->private; | |
516 | unsigned read_io = bio_data_dir(clone) == READ; | |
517 | ||
518 | /* | |
519 | * free the processed pages, even if | |
520 | * it's only a partially completed write | |
521 | */ | |
522 | if (!read_io) | |
523 | crypt_free_buffer_pages(cc, clone, done); | |
524 | ||
23541d2d | 525 | /* keep going - not finished yet */ |
8b004457 MB |
526 | if (unlikely(clone->bi_size)) |
527 | return 1; | |
528 | ||
8b004457 MB |
529 | if (!read_io) |
530 | goto out; | |
531 | ||
532 | if (unlikely(!bio_flagged(clone, BIO_UPTODATE))) { | |
533 | error = -EIO; | |
534 | goto out; | |
535 | } | |
536 | ||
537 | bio_put(clone); | |
23541d2d | 538 | io->post_process = 1; |
8b004457 MB |
539 | kcryptd_queue_io(io); |
540 | return 0; | |
541 | ||
542 | out: | |
543 | bio_put(clone); | |
544 | dec_pending(io, error); | |
545 | return error; | |
546 | } | |
547 | ||
548 | static void clone_init(struct crypt_io *io, struct bio *clone) | |
549 | { | |
550 | struct crypt_config *cc = io->target->private; | |
551 | ||
552 | clone->bi_private = io; | |
553 | clone->bi_end_io = crypt_endio; | |
554 | clone->bi_bdev = cc->dev->bdev; | |
555 | clone->bi_rw = io->base_bio->bi_rw; | |
027581f3 | 556 | clone->bi_destructor = dm_crypt_bio_destructor; |
8b004457 MB |
557 | } |
558 | ||
23541d2d | 559 | static void process_read(struct crypt_io *io) |
8b004457 MB |
560 | { |
561 | struct crypt_config *cc = io->target->private; | |
562 | struct bio *base_bio = io->base_bio; | |
563 | struct bio *clone; | |
93e605c2 MB |
564 | sector_t sector = base_bio->bi_sector - io->target->begin; |
565 | ||
566 | atomic_inc(&io->pending); | |
8b004457 MB |
567 | |
568 | /* | |
569 | * The block layer might modify the bvec array, so always | |
570 | * copy the required bvecs because we need the original | |
571 | * one in order to decrypt the whole bio data *afterwards*. | |
572 | */ | |
6a24c718 | 573 | clone = bio_alloc_bioset(GFP_NOIO, bio_segments(base_bio), cc->bs); |
93e605c2 MB |
574 | if (unlikely(!clone)) { |
575 | dec_pending(io, -ENOMEM); | |
23541d2d | 576 | return; |
93e605c2 | 577 | } |
8b004457 MB |
578 | |
579 | clone_init(io, clone); | |
580 | clone->bi_idx = 0; | |
581 | clone->bi_vcnt = bio_segments(base_bio); | |
582 | clone->bi_size = base_bio->bi_size; | |
93e605c2 | 583 | clone->bi_sector = cc->start + sector; |
8b004457 MB |
584 | memcpy(clone->bi_io_vec, bio_iovec(base_bio), |
585 | sizeof(struct bio_vec) * clone->bi_vcnt); | |
8b004457 | 586 | |
93e605c2 | 587 | generic_make_request(clone); |
8b004457 MB |
588 | } |
589 | ||
23541d2d | 590 | static void process_write(struct crypt_io *io) |
8b004457 MB |
591 | { |
592 | struct crypt_config *cc = io->target->private; | |
593 | struct bio *base_bio = io->base_bio; | |
594 | struct bio *clone; | |
93e605c2 MB |
595 | struct convert_context ctx; |
596 | unsigned remaining = base_bio->bi_size; | |
597 | sector_t sector = base_bio->bi_sector - io->target->begin; | |
8b004457 | 598 | |
93e605c2 | 599 | atomic_inc(&io->pending); |
8b004457 | 600 | |
93e605c2 | 601 | crypt_convert_init(cc, &ctx, NULL, base_bio, sector, 1); |
8b004457 | 602 | |
93e605c2 MB |
603 | /* |
604 | * The allocated buffers can be smaller than the whole bio, | |
605 | * so repeat the whole process until all the data can be handled. | |
606 | */ | |
607 | while (remaining) { | |
f97380bc | 608 | clone = crypt_alloc_buffer(io, remaining); |
23541d2d MB |
609 | if (unlikely(!clone)) { |
610 | dec_pending(io, -ENOMEM); | |
611 | return; | |
612 | } | |
93e605c2 MB |
613 | |
614 | ctx.bio_out = clone; | |
f97380bc | 615 | ctx.idx_out = 0; |
93e605c2 MB |
616 | |
617 | if (unlikely(crypt_convert(cc, &ctx) < 0)) { | |
618 | crypt_free_buffer_pages(cc, clone, clone->bi_size); | |
619 | bio_put(clone); | |
23541d2d MB |
620 | dec_pending(io, -EIO); |
621 | return; | |
93e605c2 MB |
622 | } |
623 | ||
f97380bc OK |
624 | /* crypt_convert should have filled the clone bio */ |
625 | BUG_ON(ctx.idx_out < clone->bi_vcnt); | |
626 | ||
93e605c2 | 627 | clone->bi_sector = cc->start + sector; |
93e605c2 MB |
628 | remaining -= clone->bi_size; |
629 | sector += bio_sectors(clone); | |
630 | ||
2f9941b6 OK |
631 | /* Grab another reference to the io struct |
632 | * before we kick off the request */ | |
23541d2d MB |
633 | if (remaining) |
634 | atomic_inc(&io->pending); | |
635 | ||
93e605c2 MB |
636 | generic_make_request(clone); |
637 | ||
98221eb7 OK |
638 | /* Do not reference clone after this - it |
639 | * may be gone already. */ | |
640 | ||
93e605c2 MB |
641 | /* out of memory -> run queues */ |
642 | if (remaining) | |
98221eb7 | 643 | congestion_wait(WRITE, HZ/100); |
93e605c2 | 644 | } |
8b004457 MB |
645 | } |
646 | ||
647 | static void process_read_endio(struct crypt_io *io) | |
648 | { | |
649 | struct crypt_config *cc = io->target->private; | |
1da177e4 | 650 | struct convert_context ctx; |
1da177e4 | 651 | |
8b004457 MB |
652 | crypt_convert_init(cc, &ctx, io->base_bio, io->base_bio, |
653 | io->base_bio->bi_sector - io->target->begin, 0); | |
1da177e4 | 654 | |
8b004457 | 655 | dec_pending(io, crypt_convert(cc, &ctx)); |
1da177e4 LT |
656 | } |
657 | ||
c4028958 | 658 | static void kcryptd_do_work(struct work_struct *work) |
1da177e4 | 659 | { |
c4028958 | 660 | struct crypt_io *io = container_of(work, struct crypt_io, work); |
8b004457 | 661 | |
23541d2d MB |
662 | if (io->post_process) |
663 | process_read_endio(io); | |
664 | else if (bio_data_dir(io->base_bio) == READ) | |
665 | process_read(io); | |
666 | else | |
667 | process_write(io); | |
1da177e4 LT |
668 | } |
669 | ||
670 | /* | |
671 | * Decode key from its hex representation | |
672 | */ | |
673 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) | |
674 | { | |
675 | char buffer[3]; | |
676 | char *endp; | |
677 | unsigned int i; | |
678 | ||
679 | buffer[2] = '\0'; | |
680 | ||
8b004457 | 681 | for (i = 0; i < size; i++) { |
1da177e4 LT |
682 | buffer[0] = *hex++; |
683 | buffer[1] = *hex++; | |
684 | ||
685 | key[i] = (u8)simple_strtoul(buffer, &endp, 16); | |
686 | ||
687 | if (endp != &buffer[2]) | |
688 | return -EINVAL; | |
689 | } | |
690 | ||
691 | if (*hex != '\0') | |
692 | return -EINVAL; | |
693 | ||
694 | return 0; | |
695 | } | |
696 | ||
697 | /* | |
698 | * Encode key into its hex representation | |
699 | */ | |
700 | static void crypt_encode_key(char *hex, u8 *key, unsigned int size) | |
701 | { | |
702 | unsigned int i; | |
703 | ||
8b004457 | 704 | for (i = 0; i < size; i++) { |
1da177e4 LT |
705 | sprintf(hex, "%02x", *key); |
706 | hex += 2; | |
707 | key++; | |
708 | } | |
709 | } | |
710 | ||
e48d4bbf MB |
711 | static int crypt_set_key(struct crypt_config *cc, char *key) |
712 | { | |
713 | unsigned key_size = strlen(key) >> 1; | |
714 | ||
715 | if (cc->key_size && cc->key_size != key_size) | |
716 | return -EINVAL; | |
717 | ||
718 | cc->key_size = key_size; /* initial settings */ | |
719 | ||
720 | if ((!key_size && strcmp(key, "-")) || | |
721 | (key_size && crypt_decode_key(cc->key, key, key_size) < 0)) | |
722 | return -EINVAL; | |
723 | ||
724 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
725 | ||
726 | return 0; | |
727 | } | |
728 | ||
729 | static int crypt_wipe_key(struct crypt_config *cc) | |
730 | { | |
731 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
732 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); | |
733 | return 0; | |
734 | } | |
735 | ||
1da177e4 LT |
736 | /* |
737 | * Construct an encryption mapping: | |
738 | * <cipher> <key> <iv_offset> <dev_path> <start> | |
739 | */ | |
740 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
741 | { | |
742 | struct crypt_config *cc; | |
d1806f6a | 743 | struct crypto_blkcipher *tfm; |
1da177e4 LT |
744 | char *tmp; |
745 | char *cipher; | |
746 | char *chainmode; | |
747 | char *ivmode; | |
748 | char *ivopts; | |
1da177e4 | 749 | unsigned int key_size; |
4ee218cd | 750 | unsigned long long tmpll; |
1da177e4 LT |
751 | |
752 | if (argc != 5) { | |
72d94861 | 753 | ti->error = "Not enough arguments"; |
1da177e4 LT |
754 | return -EINVAL; |
755 | } | |
756 | ||
757 | tmp = argv[0]; | |
758 | cipher = strsep(&tmp, "-"); | |
759 | chainmode = strsep(&tmp, "-"); | |
760 | ivopts = strsep(&tmp, "-"); | |
761 | ivmode = strsep(&ivopts, ":"); | |
762 | ||
763 | if (tmp) | |
72d94861 | 764 | DMWARN("Unexpected additional cipher options"); |
1da177e4 LT |
765 | |
766 | key_size = strlen(argv[1]) >> 1; | |
767 | ||
e48d4bbf | 768 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); |
1da177e4 LT |
769 | if (cc == NULL) { |
770 | ti->error = | |
72d94861 | 771 | "Cannot allocate transparent encryption context"; |
1da177e4 LT |
772 | return -ENOMEM; |
773 | } | |
774 | ||
e48d4bbf | 775 | if (crypt_set_key(cc, argv[1])) { |
72d94861 | 776 | ti->error = "Error decoding key"; |
1da177e4 LT |
777 | goto bad1; |
778 | } | |
779 | ||
780 | /* Compatiblity mode for old dm-crypt cipher strings */ | |
781 | if (!chainmode || (strcmp(chainmode, "plain") == 0 && !ivmode)) { | |
782 | chainmode = "cbc"; | |
783 | ivmode = "plain"; | |
784 | } | |
785 | ||
d1806f6a HX |
786 | if (strcmp(chainmode, "ecb") && !ivmode) { |
787 | ti->error = "This chaining mode requires an IV mechanism"; | |
1da177e4 LT |
788 | goto bad1; |
789 | } | |
790 | ||
d1806f6a HX |
791 | if (snprintf(cc->cipher, CRYPTO_MAX_ALG_NAME, "%s(%s)", chainmode, |
792 | cipher) >= CRYPTO_MAX_ALG_NAME) { | |
793 | ti->error = "Chain mode + cipher name is too long"; | |
1da177e4 LT |
794 | goto bad1; |
795 | } | |
796 | ||
d1806f6a HX |
797 | tfm = crypto_alloc_blkcipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); |
798 | if (IS_ERR(tfm)) { | |
72d94861 | 799 | ti->error = "Error allocating crypto tfm"; |
1da177e4 LT |
800 | goto bad1; |
801 | } | |
1da177e4 | 802 | |
d1806f6a HX |
803 | strcpy(cc->cipher, cipher); |
804 | strcpy(cc->chainmode, chainmode); | |
1da177e4 LT |
805 | cc->tfm = tfm; |
806 | ||
807 | /* | |
48527fa7 | 808 | * Choose ivmode. Valid modes: "plain", "essiv:<esshash>", "benbi". |
1da177e4 LT |
809 | * See comments at iv code |
810 | */ | |
811 | ||
812 | if (ivmode == NULL) | |
813 | cc->iv_gen_ops = NULL; | |
814 | else if (strcmp(ivmode, "plain") == 0) | |
815 | cc->iv_gen_ops = &crypt_iv_plain_ops; | |
816 | else if (strcmp(ivmode, "essiv") == 0) | |
817 | cc->iv_gen_ops = &crypt_iv_essiv_ops; | |
48527fa7 RS |
818 | else if (strcmp(ivmode, "benbi") == 0) |
819 | cc->iv_gen_ops = &crypt_iv_benbi_ops; | |
46b47730 LN |
820 | else if (strcmp(ivmode, "null") == 0) |
821 | cc->iv_gen_ops = &crypt_iv_null_ops; | |
1da177e4 | 822 | else { |
72d94861 | 823 | ti->error = "Invalid IV mode"; |
1da177e4 LT |
824 | goto bad2; |
825 | } | |
826 | ||
827 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr && | |
828 | cc->iv_gen_ops->ctr(cc, ti, ivopts) < 0) | |
829 | goto bad2; | |
830 | ||
d1806f6a HX |
831 | cc->iv_size = crypto_blkcipher_ivsize(tfm); |
832 | if (cc->iv_size) | |
1da177e4 | 833 | /* at least a 64 bit sector number should fit in our buffer */ |
d1806f6a | 834 | cc->iv_size = max(cc->iv_size, |
1da177e4 LT |
835 | (unsigned int)(sizeof(u64) / sizeof(u8))); |
836 | else { | |
1da177e4 | 837 | if (cc->iv_gen_ops) { |
72d94861 | 838 | DMWARN("Selected cipher does not support IVs"); |
1da177e4 LT |
839 | if (cc->iv_gen_ops->dtr) |
840 | cc->iv_gen_ops->dtr(cc); | |
841 | cc->iv_gen_ops = NULL; | |
842 | } | |
843 | } | |
844 | ||
93d2341c | 845 | cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool); |
1da177e4 | 846 | if (!cc->io_pool) { |
72d94861 | 847 | ti->error = "Cannot allocate crypt io mempool"; |
1da177e4 LT |
848 | goto bad3; |
849 | } | |
850 | ||
a19b27ce | 851 | cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0); |
1da177e4 | 852 | if (!cc->page_pool) { |
72d94861 | 853 | ti->error = "Cannot allocate page mempool"; |
1da177e4 LT |
854 | goto bad4; |
855 | } | |
856 | ||
5972511b | 857 | cc->bs = bioset_create(MIN_IOS, MIN_IOS); |
6a24c718 MB |
858 | if (!cc->bs) { |
859 | ti->error = "Cannot allocate crypt bioset"; | |
860 | goto bad_bs; | |
861 | } | |
862 | ||
d1806f6a | 863 | if (crypto_blkcipher_setkey(tfm, cc->key, key_size) < 0) { |
72d94861 | 864 | ti->error = "Error setting key"; |
1da177e4 LT |
865 | goto bad5; |
866 | } | |
867 | ||
4ee218cd | 868 | if (sscanf(argv[2], "%llu", &tmpll) != 1) { |
72d94861 | 869 | ti->error = "Invalid iv_offset sector"; |
1da177e4 LT |
870 | goto bad5; |
871 | } | |
4ee218cd | 872 | cc->iv_offset = tmpll; |
1da177e4 | 873 | |
4ee218cd | 874 | if (sscanf(argv[4], "%llu", &tmpll) != 1) { |
72d94861 | 875 | ti->error = "Invalid device sector"; |
1da177e4 LT |
876 | goto bad5; |
877 | } | |
4ee218cd | 878 | cc->start = tmpll; |
1da177e4 LT |
879 | |
880 | if (dm_get_device(ti, argv[3], cc->start, ti->len, | |
881 | dm_table_get_mode(ti->table), &cc->dev)) { | |
72d94861 | 882 | ti->error = "Device lookup failed"; |
1da177e4 LT |
883 | goto bad5; |
884 | } | |
885 | ||
886 | if (ivmode && cc->iv_gen_ops) { | |
887 | if (ivopts) | |
888 | *(ivopts - 1) = ':'; | |
889 | cc->iv_mode = kmalloc(strlen(ivmode) + 1, GFP_KERNEL); | |
890 | if (!cc->iv_mode) { | |
72d94861 | 891 | ti->error = "Error kmallocing iv_mode string"; |
1da177e4 LT |
892 | goto bad5; |
893 | } | |
894 | strcpy(cc->iv_mode, ivmode); | |
895 | } else | |
896 | cc->iv_mode = NULL; | |
897 | ||
898 | ti->private = cc; | |
899 | return 0; | |
900 | ||
901 | bad5: | |
6a24c718 MB |
902 | bioset_free(cc->bs); |
903 | bad_bs: | |
1da177e4 LT |
904 | mempool_destroy(cc->page_pool); |
905 | bad4: | |
906 | mempool_destroy(cc->io_pool); | |
907 | bad3: | |
908 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) | |
909 | cc->iv_gen_ops->dtr(cc); | |
910 | bad2: | |
d1806f6a | 911 | crypto_free_blkcipher(tfm); |
1da177e4 | 912 | bad1: |
9d3520a3 SR |
913 | /* Must zero key material before freeing */ |
914 | memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8)); | |
1da177e4 LT |
915 | kfree(cc); |
916 | return -EINVAL; | |
917 | } | |
918 | ||
919 | static void crypt_dtr(struct dm_target *ti) | |
920 | { | |
921 | struct crypt_config *cc = (struct crypt_config *) ti->private; | |
922 | ||
6a24c718 | 923 | bioset_free(cc->bs); |
1da177e4 LT |
924 | mempool_destroy(cc->page_pool); |
925 | mempool_destroy(cc->io_pool); | |
926 | ||
990a8baf | 927 | kfree(cc->iv_mode); |
1da177e4 LT |
928 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) |
929 | cc->iv_gen_ops->dtr(cc); | |
d1806f6a | 930 | crypto_free_blkcipher(cc->tfm); |
1da177e4 | 931 | dm_put_device(ti, cc->dev); |
9d3520a3 SR |
932 | |
933 | /* Must zero key material before freeing */ | |
934 | memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8)); | |
1da177e4 LT |
935 | kfree(cc); |
936 | } | |
937 | ||
1da177e4 LT |
938 | static int crypt_map(struct dm_target *ti, struct bio *bio, |
939 | union map_info *map_context) | |
940 | { | |
8b004457 | 941 | struct crypt_config *cc = ti->private; |
e48d4bbf | 942 | struct crypt_io *io; |
1da177e4 | 943 | |
9c89f8be MB |
944 | if (bio_barrier(bio)) |
945 | return -EOPNOTSUPP; | |
946 | ||
e48d4bbf | 947 | io = mempool_alloc(cc->io_pool, GFP_NOIO); |
1da177e4 | 948 | io->target = ti; |
8b004457 | 949 | io->base_bio = bio; |
23541d2d | 950 | io->error = io->post_process = 0; |
93e605c2 | 951 | atomic_set(&io->pending, 0); |
23541d2d | 952 | kcryptd_queue_io(io); |
1da177e4 | 953 | |
d2a7ad29 | 954 | return DM_MAPIO_SUBMITTED; |
1da177e4 LT |
955 | } |
956 | ||
957 | static int crypt_status(struct dm_target *ti, status_type_t type, | |
958 | char *result, unsigned int maxlen) | |
959 | { | |
960 | struct crypt_config *cc = (struct crypt_config *) ti->private; | |
1da177e4 LT |
961 | unsigned int sz = 0; |
962 | ||
963 | switch (type) { | |
964 | case STATUSTYPE_INFO: | |
965 | result[0] = '\0'; | |
966 | break; | |
967 | ||
968 | case STATUSTYPE_TABLE: | |
1da177e4 | 969 | if (cc->iv_mode) |
37af6560 CS |
970 | DMEMIT("%s-%s-%s ", cc->cipher, cc->chainmode, |
971 | cc->iv_mode); | |
1da177e4 | 972 | else |
37af6560 | 973 | DMEMIT("%s-%s ", cc->cipher, cc->chainmode); |
1da177e4 LT |
974 | |
975 | if (cc->key_size > 0) { | |
976 | if ((maxlen - sz) < ((cc->key_size << 1) + 1)) | |
977 | return -ENOMEM; | |
978 | ||
979 | crypt_encode_key(result + sz, cc->key, cc->key_size); | |
980 | sz += cc->key_size << 1; | |
981 | } else { | |
982 | if (sz >= maxlen) | |
983 | return -ENOMEM; | |
984 | result[sz++] = '-'; | |
985 | } | |
986 | ||
4ee218cd AM |
987 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
988 | cc->dev->name, (unsigned long long)cc->start); | |
1da177e4 LT |
989 | break; |
990 | } | |
991 | return 0; | |
992 | } | |
993 | ||
e48d4bbf MB |
994 | static void crypt_postsuspend(struct dm_target *ti) |
995 | { | |
996 | struct crypt_config *cc = ti->private; | |
997 | ||
998 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
999 | } | |
1000 | ||
1001 | static int crypt_preresume(struct dm_target *ti) | |
1002 | { | |
1003 | struct crypt_config *cc = ti->private; | |
1004 | ||
1005 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { | |
1006 | DMERR("aborting resume - crypt key is not set."); | |
1007 | return -EAGAIN; | |
1008 | } | |
1009 | ||
1010 | return 0; | |
1011 | } | |
1012 | ||
1013 | static void crypt_resume(struct dm_target *ti) | |
1014 | { | |
1015 | struct crypt_config *cc = ti->private; | |
1016 | ||
1017 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1018 | } | |
1019 | ||
1020 | /* Message interface | |
1021 | * key set <key> | |
1022 | * key wipe | |
1023 | */ | |
1024 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) | |
1025 | { | |
1026 | struct crypt_config *cc = ti->private; | |
1027 | ||
1028 | if (argc < 2) | |
1029 | goto error; | |
1030 | ||
1031 | if (!strnicmp(argv[0], MESG_STR("key"))) { | |
1032 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { | |
1033 | DMWARN("not suspended during key manipulation."); | |
1034 | return -EINVAL; | |
1035 | } | |
1036 | if (argc == 3 && !strnicmp(argv[1], MESG_STR("set"))) | |
1037 | return crypt_set_key(cc, argv[2]); | |
1038 | if (argc == 2 && !strnicmp(argv[1], MESG_STR("wipe"))) | |
1039 | return crypt_wipe_key(cc); | |
1040 | } | |
1041 | ||
1042 | error: | |
1043 | DMWARN("unrecognised message received."); | |
1044 | return -EINVAL; | |
1045 | } | |
1046 | ||
1da177e4 LT |
1047 | static struct target_type crypt_target = { |
1048 | .name = "crypt", | |
46b47730 | 1049 | .version= {1, 5, 0}, |
1da177e4 LT |
1050 | .module = THIS_MODULE, |
1051 | .ctr = crypt_ctr, | |
1052 | .dtr = crypt_dtr, | |
1053 | .map = crypt_map, | |
1054 | .status = crypt_status, | |
e48d4bbf MB |
1055 | .postsuspend = crypt_postsuspend, |
1056 | .preresume = crypt_preresume, | |
1057 | .resume = crypt_resume, | |
1058 | .message = crypt_message, | |
1da177e4 LT |
1059 | }; |
1060 | ||
1061 | static int __init dm_crypt_init(void) | |
1062 | { | |
1063 | int r; | |
1064 | ||
1065 | _crypt_io_pool = kmem_cache_create("dm-crypt_io", | |
1066 | sizeof(struct crypt_io), | |
1067 | 0, 0, NULL, NULL); | |
1068 | if (!_crypt_io_pool) | |
1069 | return -ENOMEM; | |
1070 | ||
1071 | _kcryptd_workqueue = create_workqueue("kcryptd"); | |
1072 | if (!_kcryptd_workqueue) { | |
1073 | r = -ENOMEM; | |
72d94861 | 1074 | DMERR("couldn't create kcryptd"); |
1da177e4 LT |
1075 | goto bad1; |
1076 | } | |
1077 | ||
1078 | r = dm_register_target(&crypt_target); | |
1079 | if (r < 0) { | |
72d94861 | 1080 | DMERR("register failed %d", r); |
1da177e4 LT |
1081 | goto bad2; |
1082 | } | |
1083 | ||
1084 | return 0; | |
1085 | ||
1086 | bad2: | |
1087 | destroy_workqueue(_kcryptd_workqueue); | |
1088 | bad1: | |
1089 | kmem_cache_destroy(_crypt_io_pool); | |
1090 | return r; | |
1091 | } | |
1092 | ||
1093 | static void __exit dm_crypt_exit(void) | |
1094 | { | |
1095 | int r = dm_unregister_target(&crypt_target); | |
1096 | ||
1097 | if (r < 0) | |
72d94861 | 1098 | DMERR("unregister failed %d", r); |
1da177e4 LT |
1099 | |
1100 | destroy_workqueue(_kcryptd_workqueue); | |
1101 | kmem_cache_destroy(_crypt_io_pool); | |
1102 | } | |
1103 | ||
1104 | module_init(dm_crypt_init); | |
1105 | module_exit(dm_crypt_exit); | |
1106 | ||
1107 | MODULE_AUTHOR("Christophe Saout <christophe@saout.de>"); | |
1108 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); | |
1109 | MODULE_LICENSE("GPL"); |