Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
bf14299f | 2 | * Copyright (C) 2003 Jana Saout <jana@saout.de> |
1da177e4 | 3 | * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org> |
542da317 | 4 | * Copyright (C) 2006-2009 Red Hat, Inc. All rights reserved. |
ed04d981 | 5 | * Copyright (C) 2013 Milan Broz <gmazyland@gmail.com> |
1da177e4 LT |
6 | * |
7 | * This file is released under the GPL. | |
8 | */ | |
9 | ||
43d69034 | 10 | #include <linux/completion.h> |
d1806f6a | 11 | #include <linux/err.h> |
1da177e4 LT |
12 | #include <linux/module.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/bio.h> | |
16 | #include <linux/blkdev.h> | |
17 | #include <linux/mempool.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/crypto.h> | |
20 | #include <linux/workqueue.h> | |
3fcfab16 | 21 | #include <linux/backing-dev.h> |
60063497 | 22 | #include <linux/atomic.h> |
378f058c | 23 | #include <linux/scatterlist.h> |
1da177e4 | 24 | #include <asm/page.h> |
48527fa7 | 25 | #include <asm/unaligned.h> |
34745785 MB |
26 | #include <crypto/hash.h> |
27 | #include <crypto/md5.h> | |
28 | #include <crypto/algapi.h> | |
1da177e4 | 29 | |
586e80e6 | 30 | #include <linux/device-mapper.h> |
1da177e4 | 31 | |
72d94861 | 32 | #define DM_MSG_PREFIX "crypt" |
1da177e4 | 33 | |
1da177e4 LT |
34 | /* |
35 | * context holding the current state of a multi-part conversion | |
36 | */ | |
37 | struct convert_context { | |
43d69034 | 38 | struct completion restart; |
1da177e4 LT |
39 | struct bio *bio_in; |
40 | struct bio *bio_out; | |
003b5c57 KO |
41 | struct bvec_iter iter_in; |
42 | struct bvec_iter iter_out; | |
c66029f4 | 43 | sector_t cc_sector; |
40b6229b | 44 | atomic_t cc_pending; |
610f2de3 | 45 | struct ablkcipher_request *req; |
1da177e4 LT |
46 | }; |
47 | ||
53017030 MB |
48 | /* |
49 | * per bio private data | |
50 | */ | |
51 | struct dm_crypt_io { | |
49a8a920 | 52 | struct crypt_config *cc; |
53017030 MB |
53 | struct bio *base_bio; |
54 | struct work_struct work; | |
55 | ||
56 | struct convert_context ctx; | |
57 | ||
40b6229b | 58 | atomic_t io_pending; |
53017030 | 59 | int error; |
0c395b0f | 60 | sector_t sector; |
298a9fa0 | 61 | } CRYPTO_MINALIGN_ATTR; |
53017030 | 62 | |
01482b76 | 63 | struct dm_crypt_request { |
b2174eeb | 64 | struct convert_context *ctx; |
01482b76 MB |
65 | struct scatterlist sg_in; |
66 | struct scatterlist sg_out; | |
2dc5327d | 67 | sector_t iv_sector; |
01482b76 MB |
68 | }; |
69 | ||
1da177e4 LT |
70 | struct crypt_config; |
71 | ||
72 | struct crypt_iv_operations { | |
73 | int (*ctr)(struct crypt_config *cc, struct dm_target *ti, | |
d469f841 | 74 | const char *opts); |
1da177e4 | 75 | void (*dtr)(struct crypt_config *cc); |
b95bf2d3 | 76 | int (*init)(struct crypt_config *cc); |
542da317 | 77 | int (*wipe)(struct crypt_config *cc); |
2dc5327d MB |
78 | int (*generator)(struct crypt_config *cc, u8 *iv, |
79 | struct dm_crypt_request *dmreq); | |
80 | int (*post)(struct crypt_config *cc, u8 *iv, | |
81 | struct dm_crypt_request *dmreq); | |
1da177e4 LT |
82 | }; |
83 | ||
60473592 | 84 | struct iv_essiv_private { |
b95bf2d3 MB |
85 | struct crypto_hash *hash_tfm; |
86 | u8 *salt; | |
60473592 MB |
87 | }; |
88 | ||
89 | struct iv_benbi_private { | |
90 | int shift; | |
91 | }; | |
92 | ||
34745785 MB |
93 | #define LMK_SEED_SIZE 64 /* hash + 0 */ |
94 | struct iv_lmk_private { | |
95 | struct crypto_shash *hash_tfm; | |
96 | u8 *seed; | |
97 | }; | |
98 | ||
ed04d981 MB |
99 | #define TCW_WHITENING_SIZE 16 |
100 | struct iv_tcw_private { | |
101 | struct crypto_shash *crc32_tfm; | |
102 | u8 *iv_seed; | |
103 | u8 *whitening; | |
104 | }; | |
105 | ||
1da177e4 LT |
106 | /* |
107 | * Crypt: maps a linear range of a block device | |
108 | * and encrypts / decrypts at the same time. | |
109 | */ | |
f3396c58 | 110 | enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID, DM_CRYPT_SAME_CPU }; |
c0297721 AK |
111 | |
112 | /* | |
610f2de3 | 113 | * The fields in here must be read only after initialization. |
c0297721 | 114 | */ |
1da177e4 LT |
115 | struct crypt_config { |
116 | struct dm_dev *dev; | |
117 | sector_t start; | |
118 | ||
119 | /* | |
ddd42edf MB |
120 | * pool for per bio private data, crypto requests and |
121 | * encryption requeusts/buffer pages | |
1da177e4 LT |
122 | */ |
123 | mempool_t *io_pool; | |
ddd42edf | 124 | mempool_t *req_pool; |
1da177e4 | 125 | mempool_t *page_pool; |
6a24c718 | 126 | struct bio_set *bs; |
1da177e4 | 127 | |
cabf08e4 MB |
128 | struct workqueue_struct *io_queue; |
129 | struct workqueue_struct *crypt_queue; | |
3f1e9070 | 130 | |
5ebaee6d | 131 | char *cipher; |
7dbcd137 | 132 | char *cipher_string; |
5ebaee6d | 133 | |
1da177e4 | 134 | struct crypt_iv_operations *iv_gen_ops; |
79066ad3 | 135 | union { |
60473592 MB |
136 | struct iv_essiv_private essiv; |
137 | struct iv_benbi_private benbi; | |
34745785 | 138 | struct iv_lmk_private lmk; |
ed04d981 | 139 | struct iv_tcw_private tcw; |
79066ad3 | 140 | } iv_gen_private; |
1da177e4 LT |
141 | sector_t iv_offset; |
142 | unsigned int iv_size; | |
143 | ||
fd2d231f MP |
144 | /* ESSIV: struct crypto_cipher *essiv_tfm */ |
145 | void *iv_private; | |
146 | struct crypto_ablkcipher **tfms; | |
d1f96423 | 147 | unsigned tfms_count; |
c0297721 | 148 | |
ddd42edf MB |
149 | /* |
150 | * Layout of each crypto request: | |
151 | * | |
152 | * struct ablkcipher_request | |
153 | * context | |
154 | * padding | |
155 | * struct dm_crypt_request | |
156 | * padding | |
157 | * IV | |
158 | * | |
159 | * The padding is added so that dm_crypt_request and the IV are | |
160 | * correctly aligned. | |
161 | */ | |
162 | unsigned int dmreq_start; | |
ddd42edf | 163 | |
298a9fa0 MP |
164 | unsigned int per_bio_data_size; |
165 | ||
e48d4bbf | 166 | unsigned long flags; |
1da177e4 | 167 | unsigned int key_size; |
da31a078 MB |
168 | unsigned int key_parts; /* independent parts in key buffer */ |
169 | unsigned int key_extra_size; /* additional keys length */ | |
1da177e4 LT |
170 | u8 key[0]; |
171 | }; | |
172 | ||
6a24c718 | 173 | #define MIN_IOS 16 |
1da177e4 | 174 | |
e18b890b | 175 | static struct kmem_cache *_crypt_io_pool; |
1da177e4 | 176 | |
028867ac | 177 | static void clone_init(struct dm_crypt_io *, struct bio *); |
395b167c | 178 | static void kcryptd_queue_crypt(struct dm_crypt_io *io); |
2dc5327d | 179 | static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq); |
027581f3 | 180 | |
c0297721 AK |
181 | /* |
182 | * Use this to access cipher attributes that are the same for each CPU. | |
183 | */ | |
184 | static struct crypto_ablkcipher *any_tfm(struct crypt_config *cc) | |
185 | { | |
fd2d231f | 186 | return cc->tfms[0]; |
c0297721 AK |
187 | } |
188 | ||
1da177e4 LT |
189 | /* |
190 | * Different IV generation algorithms: | |
191 | * | |
3c164bd8 | 192 | * plain: the initial vector is the 32-bit little-endian version of the sector |
3a4fa0a2 | 193 | * number, padded with zeros if necessary. |
1da177e4 | 194 | * |
61afef61 MB |
195 | * plain64: the initial vector is the 64-bit little-endian version of the sector |
196 | * number, padded with zeros if necessary. | |
197 | * | |
3c164bd8 RS |
198 | * essiv: "encrypted sector|salt initial vector", the sector number is |
199 | * encrypted with the bulk cipher using a salt as key. The salt | |
200 | * should be derived from the bulk cipher's key via hashing. | |
1da177e4 | 201 | * |
48527fa7 RS |
202 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
203 | * (needed for LRW-32-AES and possible other narrow block modes) | |
204 | * | |
46b47730 LN |
205 | * null: the initial vector is always zero. Provides compatibility with |
206 | * obsolete loop_fish2 devices. Do not use for new devices. | |
207 | * | |
34745785 MB |
208 | * lmk: Compatible implementation of the block chaining mode used |
209 | * by the Loop-AES block device encryption system | |
210 | * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ | |
211 | * It operates on full 512 byte sectors and uses CBC | |
212 | * with an IV derived from the sector number, the data and | |
213 | * optionally extra IV seed. | |
214 | * This means that after decryption the first block | |
215 | * of sector must be tweaked according to decrypted data. | |
216 | * Loop-AES can use three encryption schemes: | |
217 | * version 1: is plain aes-cbc mode | |
218 | * version 2: uses 64 multikey scheme with lmk IV generator | |
219 | * version 3: the same as version 2 with additional IV seed | |
220 | * (it uses 65 keys, last key is used as IV seed) | |
221 | * | |
ed04d981 MB |
222 | * tcw: Compatible implementation of the block chaining mode used |
223 | * by the TrueCrypt device encryption system (prior to version 4.1). | |
224 | * For more info see: http://www.truecrypt.org | |
225 | * It operates on full 512 byte sectors and uses CBC | |
226 | * with an IV derived from initial key and the sector number. | |
227 | * In addition, whitening value is applied on every sector, whitening | |
228 | * is calculated from initial key, sector number and mixed using CRC32. | |
229 | * Note that this encryption scheme is vulnerable to watermarking attacks | |
230 | * and should be used for old compatible containers access only. | |
231 | * | |
1da177e4 LT |
232 | * plumb: unimplemented, see: |
233 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 | |
234 | */ | |
235 | ||
2dc5327d MB |
236 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, |
237 | struct dm_crypt_request *dmreq) | |
1da177e4 LT |
238 | { |
239 | memset(iv, 0, cc->iv_size); | |
283a8328 | 240 | *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); |
1da177e4 LT |
241 | |
242 | return 0; | |
243 | } | |
244 | ||
61afef61 | 245 | static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, |
2dc5327d | 246 | struct dm_crypt_request *dmreq) |
61afef61 MB |
247 | { |
248 | memset(iv, 0, cc->iv_size); | |
283a8328 | 249 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
61afef61 MB |
250 | |
251 | return 0; | |
252 | } | |
253 | ||
b95bf2d3 MB |
254 | /* Initialise ESSIV - compute salt but no local memory allocations */ |
255 | static int crypt_iv_essiv_init(struct crypt_config *cc) | |
256 | { | |
257 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
258 | struct hash_desc desc; | |
259 | struct scatterlist sg; | |
c0297721 | 260 | struct crypto_cipher *essiv_tfm; |
fd2d231f | 261 | int err; |
b95bf2d3 MB |
262 | |
263 | sg_init_one(&sg, cc->key, cc->key_size); | |
264 | desc.tfm = essiv->hash_tfm; | |
265 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
266 | ||
267 | err = crypto_hash_digest(&desc, &sg, cc->key_size, essiv->salt); | |
268 | if (err) | |
269 | return err; | |
270 | ||
fd2d231f | 271 | essiv_tfm = cc->iv_private; |
c0297721 | 272 | |
fd2d231f MP |
273 | err = crypto_cipher_setkey(essiv_tfm, essiv->salt, |
274 | crypto_hash_digestsize(essiv->hash_tfm)); | |
275 | if (err) | |
276 | return err; | |
c0297721 AK |
277 | |
278 | return 0; | |
b95bf2d3 MB |
279 | } |
280 | ||
542da317 MB |
281 | /* Wipe salt and reset key derived from volume key */ |
282 | static int crypt_iv_essiv_wipe(struct crypt_config *cc) | |
283 | { | |
284 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
285 | unsigned salt_size = crypto_hash_digestsize(essiv->hash_tfm); | |
c0297721 | 286 | struct crypto_cipher *essiv_tfm; |
fd2d231f | 287 | int r, err = 0; |
542da317 MB |
288 | |
289 | memset(essiv->salt, 0, salt_size); | |
290 | ||
fd2d231f MP |
291 | essiv_tfm = cc->iv_private; |
292 | r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size); | |
293 | if (r) | |
294 | err = r; | |
c0297721 AK |
295 | |
296 | return err; | |
297 | } | |
298 | ||
299 | /* Set up per cpu cipher state */ | |
300 | static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc, | |
301 | struct dm_target *ti, | |
302 | u8 *salt, unsigned saltsize) | |
303 | { | |
304 | struct crypto_cipher *essiv_tfm; | |
305 | int err; | |
306 | ||
307 | /* Setup the essiv_tfm with the given salt */ | |
308 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); | |
309 | if (IS_ERR(essiv_tfm)) { | |
310 | ti->error = "Error allocating crypto tfm for ESSIV"; | |
311 | return essiv_tfm; | |
312 | } | |
313 | ||
314 | if (crypto_cipher_blocksize(essiv_tfm) != | |
315 | crypto_ablkcipher_ivsize(any_tfm(cc))) { | |
316 | ti->error = "Block size of ESSIV cipher does " | |
317 | "not match IV size of block cipher"; | |
318 | crypto_free_cipher(essiv_tfm); | |
319 | return ERR_PTR(-EINVAL); | |
320 | } | |
321 | ||
322 | err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); | |
323 | if (err) { | |
324 | ti->error = "Failed to set key for ESSIV cipher"; | |
325 | crypto_free_cipher(essiv_tfm); | |
326 | return ERR_PTR(err); | |
327 | } | |
328 | ||
329 | return essiv_tfm; | |
542da317 MB |
330 | } |
331 | ||
60473592 MB |
332 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) |
333 | { | |
c0297721 | 334 | struct crypto_cipher *essiv_tfm; |
60473592 MB |
335 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; |
336 | ||
b95bf2d3 MB |
337 | crypto_free_hash(essiv->hash_tfm); |
338 | essiv->hash_tfm = NULL; | |
339 | ||
340 | kzfree(essiv->salt); | |
341 | essiv->salt = NULL; | |
c0297721 | 342 | |
fd2d231f | 343 | essiv_tfm = cc->iv_private; |
c0297721 | 344 | |
fd2d231f MP |
345 | if (essiv_tfm) |
346 | crypto_free_cipher(essiv_tfm); | |
c0297721 | 347 | |
fd2d231f | 348 | cc->iv_private = NULL; |
60473592 MB |
349 | } |
350 | ||
1da177e4 | 351 | static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, |
d469f841 | 352 | const char *opts) |
1da177e4 | 353 | { |
5861f1be MB |
354 | struct crypto_cipher *essiv_tfm = NULL; |
355 | struct crypto_hash *hash_tfm = NULL; | |
5861f1be | 356 | u8 *salt = NULL; |
fd2d231f | 357 | int err; |
1da177e4 | 358 | |
5861f1be | 359 | if (!opts) { |
72d94861 | 360 | ti->error = "Digest algorithm missing for ESSIV mode"; |
1da177e4 LT |
361 | return -EINVAL; |
362 | } | |
363 | ||
b95bf2d3 | 364 | /* Allocate hash algorithm */ |
35058687 HX |
365 | hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC); |
366 | if (IS_ERR(hash_tfm)) { | |
72d94861 | 367 | ti->error = "Error initializing ESSIV hash"; |
5861f1be MB |
368 | err = PTR_ERR(hash_tfm); |
369 | goto bad; | |
1da177e4 LT |
370 | } |
371 | ||
b95bf2d3 | 372 | salt = kzalloc(crypto_hash_digestsize(hash_tfm), GFP_KERNEL); |
5861f1be | 373 | if (!salt) { |
72d94861 | 374 | ti->error = "Error kmallocing salt storage in ESSIV"; |
5861f1be MB |
375 | err = -ENOMEM; |
376 | goto bad; | |
1da177e4 LT |
377 | } |
378 | ||
b95bf2d3 | 379 | cc->iv_gen_private.essiv.salt = salt; |
b95bf2d3 MB |
380 | cc->iv_gen_private.essiv.hash_tfm = hash_tfm; |
381 | ||
fd2d231f MP |
382 | essiv_tfm = setup_essiv_cpu(cc, ti, salt, |
383 | crypto_hash_digestsize(hash_tfm)); | |
384 | if (IS_ERR(essiv_tfm)) { | |
385 | crypt_iv_essiv_dtr(cc); | |
386 | return PTR_ERR(essiv_tfm); | |
c0297721 | 387 | } |
fd2d231f | 388 | cc->iv_private = essiv_tfm; |
c0297721 | 389 | |
1da177e4 | 390 | return 0; |
5861f1be MB |
391 | |
392 | bad: | |
5861f1be MB |
393 | if (hash_tfm && !IS_ERR(hash_tfm)) |
394 | crypto_free_hash(hash_tfm); | |
b95bf2d3 | 395 | kfree(salt); |
5861f1be | 396 | return err; |
1da177e4 LT |
397 | } |
398 | ||
2dc5327d MB |
399 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, |
400 | struct dm_crypt_request *dmreq) | |
1da177e4 | 401 | { |
fd2d231f | 402 | struct crypto_cipher *essiv_tfm = cc->iv_private; |
c0297721 | 403 | |
1da177e4 | 404 | memset(iv, 0, cc->iv_size); |
283a8328 | 405 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
c0297721 AK |
406 | crypto_cipher_encrypt_one(essiv_tfm, iv, iv); |
407 | ||
1da177e4 LT |
408 | return 0; |
409 | } | |
410 | ||
48527fa7 RS |
411 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
412 | const char *opts) | |
413 | { | |
c0297721 | 414 | unsigned bs = crypto_ablkcipher_blocksize(any_tfm(cc)); |
f0d1b0b3 | 415 | int log = ilog2(bs); |
48527fa7 RS |
416 | |
417 | /* we need to calculate how far we must shift the sector count | |
418 | * to get the cipher block count, we use this shift in _gen */ | |
419 | ||
420 | if (1 << log != bs) { | |
421 | ti->error = "cypher blocksize is not a power of 2"; | |
422 | return -EINVAL; | |
423 | } | |
424 | ||
425 | if (log > 9) { | |
426 | ti->error = "cypher blocksize is > 512"; | |
427 | return -EINVAL; | |
428 | } | |
429 | ||
60473592 | 430 | cc->iv_gen_private.benbi.shift = 9 - log; |
48527fa7 RS |
431 | |
432 | return 0; | |
433 | } | |
434 | ||
435 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) | |
436 | { | |
48527fa7 RS |
437 | } |
438 | ||
2dc5327d MB |
439 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, |
440 | struct dm_crypt_request *dmreq) | |
48527fa7 | 441 | { |
79066ad3 HX |
442 | __be64 val; |
443 | ||
48527fa7 | 444 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
79066ad3 | 445 | |
2dc5327d | 446 | val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); |
79066ad3 | 447 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); |
48527fa7 | 448 | |
1da177e4 LT |
449 | return 0; |
450 | } | |
451 | ||
2dc5327d MB |
452 | static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, |
453 | struct dm_crypt_request *dmreq) | |
46b47730 LN |
454 | { |
455 | memset(iv, 0, cc->iv_size); | |
456 | ||
457 | return 0; | |
458 | } | |
459 | ||
34745785 MB |
460 | static void crypt_iv_lmk_dtr(struct crypt_config *cc) |
461 | { | |
462 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
463 | ||
464 | if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) | |
465 | crypto_free_shash(lmk->hash_tfm); | |
466 | lmk->hash_tfm = NULL; | |
467 | ||
468 | kzfree(lmk->seed); | |
469 | lmk->seed = NULL; | |
470 | } | |
471 | ||
472 | static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, | |
473 | const char *opts) | |
474 | { | |
475 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
476 | ||
477 | lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0); | |
478 | if (IS_ERR(lmk->hash_tfm)) { | |
479 | ti->error = "Error initializing LMK hash"; | |
480 | return PTR_ERR(lmk->hash_tfm); | |
481 | } | |
482 | ||
483 | /* No seed in LMK version 2 */ | |
484 | if (cc->key_parts == cc->tfms_count) { | |
485 | lmk->seed = NULL; | |
486 | return 0; | |
487 | } | |
488 | ||
489 | lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); | |
490 | if (!lmk->seed) { | |
491 | crypt_iv_lmk_dtr(cc); | |
492 | ti->error = "Error kmallocing seed storage in LMK"; | |
493 | return -ENOMEM; | |
494 | } | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
499 | static int crypt_iv_lmk_init(struct crypt_config *cc) | |
500 | { | |
501 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
502 | int subkey_size = cc->key_size / cc->key_parts; | |
503 | ||
504 | /* LMK seed is on the position of LMK_KEYS + 1 key */ | |
505 | if (lmk->seed) | |
506 | memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), | |
507 | crypto_shash_digestsize(lmk->hash_tfm)); | |
508 | ||
509 | return 0; | |
510 | } | |
511 | ||
512 | static int crypt_iv_lmk_wipe(struct crypt_config *cc) | |
513 | { | |
514 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
515 | ||
516 | if (lmk->seed) | |
517 | memset(lmk->seed, 0, LMK_SEED_SIZE); | |
518 | ||
519 | return 0; | |
520 | } | |
521 | ||
522 | static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, | |
523 | struct dm_crypt_request *dmreq, | |
524 | u8 *data) | |
525 | { | |
526 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
b6106265 | 527 | SHASH_DESC_ON_STACK(desc, lmk->hash_tfm); |
34745785 | 528 | struct md5_state md5state; |
da31a078 | 529 | __le32 buf[4]; |
34745785 MB |
530 | int i, r; |
531 | ||
b6106265 JSM |
532 | desc->tfm = lmk->hash_tfm; |
533 | desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
34745785 | 534 | |
b6106265 | 535 | r = crypto_shash_init(desc); |
34745785 MB |
536 | if (r) |
537 | return r; | |
538 | ||
539 | if (lmk->seed) { | |
b6106265 | 540 | r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE); |
34745785 MB |
541 | if (r) |
542 | return r; | |
543 | } | |
544 | ||
545 | /* Sector is always 512B, block size 16, add data of blocks 1-31 */ | |
b6106265 | 546 | r = crypto_shash_update(desc, data + 16, 16 * 31); |
34745785 MB |
547 | if (r) |
548 | return r; | |
549 | ||
550 | /* Sector is cropped to 56 bits here */ | |
551 | buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); | |
552 | buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); | |
553 | buf[2] = cpu_to_le32(4024); | |
554 | buf[3] = 0; | |
b6106265 | 555 | r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf)); |
34745785 MB |
556 | if (r) |
557 | return r; | |
558 | ||
559 | /* No MD5 padding here */ | |
b6106265 | 560 | r = crypto_shash_export(desc, &md5state); |
34745785 MB |
561 | if (r) |
562 | return r; | |
563 | ||
564 | for (i = 0; i < MD5_HASH_WORDS; i++) | |
565 | __cpu_to_le32s(&md5state.hash[i]); | |
566 | memcpy(iv, &md5state.hash, cc->iv_size); | |
567 | ||
568 | return 0; | |
569 | } | |
570 | ||
571 | static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, | |
572 | struct dm_crypt_request *dmreq) | |
573 | { | |
574 | u8 *src; | |
575 | int r = 0; | |
576 | ||
577 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { | |
c2e022cb | 578 | src = kmap_atomic(sg_page(&dmreq->sg_in)); |
34745785 | 579 | r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset); |
c2e022cb | 580 | kunmap_atomic(src); |
34745785 MB |
581 | } else |
582 | memset(iv, 0, cc->iv_size); | |
583 | ||
584 | return r; | |
585 | } | |
586 | ||
587 | static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, | |
588 | struct dm_crypt_request *dmreq) | |
589 | { | |
590 | u8 *dst; | |
591 | int r; | |
592 | ||
593 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) | |
594 | return 0; | |
595 | ||
c2e022cb | 596 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); |
34745785 MB |
597 | r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset); |
598 | ||
599 | /* Tweak the first block of plaintext sector */ | |
600 | if (!r) | |
601 | crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size); | |
602 | ||
c2e022cb | 603 | kunmap_atomic(dst); |
34745785 MB |
604 | return r; |
605 | } | |
606 | ||
ed04d981 MB |
607 | static void crypt_iv_tcw_dtr(struct crypt_config *cc) |
608 | { | |
609 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
610 | ||
611 | kzfree(tcw->iv_seed); | |
612 | tcw->iv_seed = NULL; | |
613 | kzfree(tcw->whitening); | |
614 | tcw->whitening = NULL; | |
615 | ||
616 | if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm)) | |
617 | crypto_free_shash(tcw->crc32_tfm); | |
618 | tcw->crc32_tfm = NULL; | |
619 | } | |
620 | ||
621 | static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti, | |
622 | const char *opts) | |
623 | { | |
624 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
625 | ||
626 | if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) { | |
627 | ti->error = "Wrong key size for TCW"; | |
628 | return -EINVAL; | |
629 | } | |
630 | ||
631 | tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0); | |
632 | if (IS_ERR(tcw->crc32_tfm)) { | |
633 | ti->error = "Error initializing CRC32 in TCW"; | |
634 | return PTR_ERR(tcw->crc32_tfm); | |
635 | } | |
636 | ||
637 | tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL); | |
638 | tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL); | |
639 | if (!tcw->iv_seed || !tcw->whitening) { | |
640 | crypt_iv_tcw_dtr(cc); | |
641 | ti->error = "Error allocating seed storage in TCW"; | |
642 | return -ENOMEM; | |
643 | } | |
644 | ||
645 | return 0; | |
646 | } | |
647 | ||
648 | static int crypt_iv_tcw_init(struct crypt_config *cc) | |
649 | { | |
650 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
651 | int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE; | |
652 | ||
653 | memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size); | |
654 | memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size], | |
655 | TCW_WHITENING_SIZE); | |
656 | ||
657 | return 0; | |
658 | } | |
659 | ||
660 | static int crypt_iv_tcw_wipe(struct crypt_config *cc) | |
661 | { | |
662 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
663 | ||
664 | memset(tcw->iv_seed, 0, cc->iv_size); | |
665 | memset(tcw->whitening, 0, TCW_WHITENING_SIZE); | |
666 | ||
667 | return 0; | |
668 | } | |
669 | ||
670 | static int crypt_iv_tcw_whitening(struct crypt_config *cc, | |
671 | struct dm_crypt_request *dmreq, | |
672 | u8 *data) | |
673 | { | |
674 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
675 | u64 sector = cpu_to_le64((u64)dmreq->iv_sector); | |
676 | u8 buf[TCW_WHITENING_SIZE]; | |
b6106265 | 677 | SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm); |
ed04d981 MB |
678 | int i, r; |
679 | ||
680 | /* xor whitening with sector number */ | |
681 | memcpy(buf, tcw->whitening, TCW_WHITENING_SIZE); | |
682 | crypto_xor(buf, (u8 *)§or, 8); | |
683 | crypto_xor(&buf[8], (u8 *)§or, 8); | |
684 | ||
685 | /* calculate crc32 for every 32bit part and xor it */ | |
b6106265 JSM |
686 | desc->tfm = tcw->crc32_tfm; |
687 | desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
ed04d981 | 688 | for (i = 0; i < 4; i++) { |
b6106265 | 689 | r = crypto_shash_init(desc); |
ed04d981 MB |
690 | if (r) |
691 | goto out; | |
b6106265 | 692 | r = crypto_shash_update(desc, &buf[i * 4], 4); |
ed04d981 MB |
693 | if (r) |
694 | goto out; | |
b6106265 | 695 | r = crypto_shash_final(desc, &buf[i * 4]); |
ed04d981 MB |
696 | if (r) |
697 | goto out; | |
698 | } | |
699 | crypto_xor(&buf[0], &buf[12], 4); | |
700 | crypto_xor(&buf[4], &buf[8], 4); | |
701 | ||
702 | /* apply whitening (8 bytes) to whole sector */ | |
703 | for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++) | |
704 | crypto_xor(data + i * 8, buf, 8); | |
705 | out: | |
1a71d6ff | 706 | memzero_explicit(buf, sizeof(buf)); |
ed04d981 MB |
707 | return r; |
708 | } | |
709 | ||
710 | static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, | |
711 | struct dm_crypt_request *dmreq) | |
712 | { | |
713 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
714 | u64 sector = cpu_to_le64((u64)dmreq->iv_sector); | |
715 | u8 *src; | |
716 | int r = 0; | |
717 | ||
718 | /* Remove whitening from ciphertext */ | |
719 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { | |
720 | src = kmap_atomic(sg_page(&dmreq->sg_in)); | |
721 | r = crypt_iv_tcw_whitening(cc, dmreq, src + dmreq->sg_in.offset); | |
722 | kunmap_atomic(src); | |
723 | } | |
724 | ||
725 | /* Calculate IV */ | |
726 | memcpy(iv, tcw->iv_seed, cc->iv_size); | |
727 | crypto_xor(iv, (u8 *)§or, 8); | |
728 | if (cc->iv_size > 8) | |
729 | crypto_xor(&iv[8], (u8 *)§or, cc->iv_size - 8); | |
730 | ||
731 | return r; | |
732 | } | |
733 | ||
734 | static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, | |
735 | struct dm_crypt_request *dmreq) | |
736 | { | |
737 | u8 *dst; | |
738 | int r; | |
739 | ||
740 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) | |
741 | return 0; | |
742 | ||
743 | /* Apply whitening on ciphertext */ | |
744 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); | |
745 | r = crypt_iv_tcw_whitening(cc, dmreq, dst + dmreq->sg_out.offset); | |
746 | kunmap_atomic(dst); | |
747 | ||
748 | return r; | |
749 | } | |
750 | ||
1da177e4 LT |
751 | static struct crypt_iv_operations crypt_iv_plain_ops = { |
752 | .generator = crypt_iv_plain_gen | |
753 | }; | |
754 | ||
61afef61 MB |
755 | static struct crypt_iv_operations crypt_iv_plain64_ops = { |
756 | .generator = crypt_iv_plain64_gen | |
757 | }; | |
758 | ||
1da177e4 LT |
759 | static struct crypt_iv_operations crypt_iv_essiv_ops = { |
760 | .ctr = crypt_iv_essiv_ctr, | |
761 | .dtr = crypt_iv_essiv_dtr, | |
b95bf2d3 | 762 | .init = crypt_iv_essiv_init, |
542da317 | 763 | .wipe = crypt_iv_essiv_wipe, |
1da177e4 LT |
764 | .generator = crypt_iv_essiv_gen |
765 | }; | |
766 | ||
48527fa7 RS |
767 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
768 | .ctr = crypt_iv_benbi_ctr, | |
769 | .dtr = crypt_iv_benbi_dtr, | |
770 | .generator = crypt_iv_benbi_gen | |
771 | }; | |
1da177e4 | 772 | |
46b47730 LN |
773 | static struct crypt_iv_operations crypt_iv_null_ops = { |
774 | .generator = crypt_iv_null_gen | |
775 | }; | |
776 | ||
34745785 MB |
777 | static struct crypt_iv_operations crypt_iv_lmk_ops = { |
778 | .ctr = crypt_iv_lmk_ctr, | |
779 | .dtr = crypt_iv_lmk_dtr, | |
780 | .init = crypt_iv_lmk_init, | |
781 | .wipe = crypt_iv_lmk_wipe, | |
782 | .generator = crypt_iv_lmk_gen, | |
783 | .post = crypt_iv_lmk_post | |
784 | }; | |
785 | ||
ed04d981 MB |
786 | static struct crypt_iv_operations crypt_iv_tcw_ops = { |
787 | .ctr = crypt_iv_tcw_ctr, | |
788 | .dtr = crypt_iv_tcw_dtr, | |
789 | .init = crypt_iv_tcw_init, | |
790 | .wipe = crypt_iv_tcw_wipe, | |
791 | .generator = crypt_iv_tcw_gen, | |
792 | .post = crypt_iv_tcw_post | |
793 | }; | |
794 | ||
d469f841 MB |
795 | static void crypt_convert_init(struct crypt_config *cc, |
796 | struct convert_context *ctx, | |
797 | struct bio *bio_out, struct bio *bio_in, | |
fcd369da | 798 | sector_t sector) |
1da177e4 LT |
799 | { |
800 | ctx->bio_in = bio_in; | |
801 | ctx->bio_out = bio_out; | |
003b5c57 KO |
802 | if (bio_in) |
803 | ctx->iter_in = bio_in->bi_iter; | |
804 | if (bio_out) | |
805 | ctx->iter_out = bio_out->bi_iter; | |
c66029f4 | 806 | ctx->cc_sector = sector + cc->iv_offset; |
43d69034 | 807 | init_completion(&ctx->restart); |
1da177e4 LT |
808 | } |
809 | ||
b2174eeb HY |
810 | static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, |
811 | struct ablkcipher_request *req) | |
812 | { | |
813 | return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); | |
814 | } | |
815 | ||
816 | static struct ablkcipher_request *req_of_dmreq(struct crypt_config *cc, | |
817 | struct dm_crypt_request *dmreq) | |
818 | { | |
819 | return (struct ablkcipher_request *)((char *)dmreq - cc->dmreq_start); | |
820 | } | |
821 | ||
2dc5327d MB |
822 | static u8 *iv_of_dmreq(struct crypt_config *cc, |
823 | struct dm_crypt_request *dmreq) | |
824 | { | |
825 | return (u8 *)ALIGN((unsigned long)(dmreq + 1), | |
826 | crypto_ablkcipher_alignmask(any_tfm(cc)) + 1); | |
827 | } | |
828 | ||
01482b76 | 829 | static int crypt_convert_block(struct crypt_config *cc, |
3a7f6c99 MB |
830 | struct convert_context *ctx, |
831 | struct ablkcipher_request *req) | |
01482b76 | 832 | { |
003b5c57 KO |
833 | struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); |
834 | struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); | |
3a7f6c99 MB |
835 | struct dm_crypt_request *dmreq; |
836 | u8 *iv; | |
40b6229b | 837 | int r; |
3a7f6c99 | 838 | |
b2174eeb | 839 | dmreq = dmreq_of_req(cc, req); |
2dc5327d | 840 | iv = iv_of_dmreq(cc, dmreq); |
01482b76 | 841 | |
c66029f4 | 842 | dmreq->iv_sector = ctx->cc_sector; |
b2174eeb | 843 | dmreq->ctx = ctx; |
3a7f6c99 | 844 | sg_init_table(&dmreq->sg_in, 1); |
003b5c57 KO |
845 | sg_set_page(&dmreq->sg_in, bv_in.bv_page, 1 << SECTOR_SHIFT, |
846 | bv_in.bv_offset); | |
01482b76 | 847 | |
3a7f6c99 | 848 | sg_init_table(&dmreq->sg_out, 1); |
003b5c57 KO |
849 | sg_set_page(&dmreq->sg_out, bv_out.bv_page, 1 << SECTOR_SHIFT, |
850 | bv_out.bv_offset); | |
01482b76 | 851 | |
003b5c57 KO |
852 | bio_advance_iter(ctx->bio_in, &ctx->iter_in, 1 << SECTOR_SHIFT); |
853 | bio_advance_iter(ctx->bio_out, &ctx->iter_out, 1 << SECTOR_SHIFT); | |
01482b76 | 854 | |
3a7f6c99 | 855 | if (cc->iv_gen_ops) { |
2dc5327d | 856 | r = cc->iv_gen_ops->generator(cc, iv, dmreq); |
3a7f6c99 MB |
857 | if (r < 0) |
858 | return r; | |
859 | } | |
860 | ||
861 | ablkcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out, | |
862 | 1 << SECTOR_SHIFT, iv); | |
863 | ||
864 | if (bio_data_dir(ctx->bio_in) == WRITE) | |
865 | r = crypto_ablkcipher_encrypt(req); | |
866 | else | |
867 | r = crypto_ablkcipher_decrypt(req); | |
868 | ||
2dc5327d MB |
869 | if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) |
870 | r = cc->iv_gen_ops->post(cc, iv, dmreq); | |
871 | ||
3a7f6c99 | 872 | return r; |
01482b76 MB |
873 | } |
874 | ||
95497a96 MB |
875 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
876 | int error); | |
c0297721 | 877 | |
ddd42edf MB |
878 | static void crypt_alloc_req(struct crypt_config *cc, |
879 | struct convert_context *ctx) | |
880 | { | |
c66029f4 | 881 | unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1); |
c0297721 | 882 | |
610f2de3 MP |
883 | if (!ctx->req) |
884 | ctx->req = mempool_alloc(cc->req_pool, GFP_NOIO); | |
c0297721 | 885 | |
610f2de3 MP |
886 | ablkcipher_request_set_tfm(ctx->req, cc->tfms[key_index]); |
887 | ablkcipher_request_set_callback(ctx->req, | |
c0297721 | 888 | CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, |
610f2de3 | 889 | kcryptd_async_done, dmreq_of_req(cc, ctx->req)); |
ddd42edf MB |
890 | } |
891 | ||
298a9fa0 MP |
892 | static void crypt_free_req(struct crypt_config *cc, |
893 | struct ablkcipher_request *req, struct bio *base_bio) | |
894 | { | |
895 | struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); | |
896 | ||
897 | if ((struct ablkcipher_request *)(io + 1) != req) | |
898 | mempool_free(req, cc->req_pool); | |
899 | } | |
900 | ||
1da177e4 LT |
901 | /* |
902 | * Encrypt / decrypt data from one bio to another one (can be the same one) | |
903 | */ | |
904 | static int crypt_convert(struct crypt_config *cc, | |
d469f841 | 905 | struct convert_context *ctx) |
1da177e4 | 906 | { |
3f1e9070 | 907 | int r; |
1da177e4 | 908 | |
40b6229b | 909 | atomic_set(&ctx->cc_pending, 1); |
c8081618 | 910 | |
003b5c57 | 911 | while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) { |
1da177e4 | 912 | |
3a7f6c99 MB |
913 | crypt_alloc_req(cc, ctx); |
914 | ||
40b6229b | 915 | atomic_inc(&ctx->cc_pending); |
3f1e9070 | 916 | |
610f2de3 | 917 | r = crypt_convert_block(cc, ctx, ctx->req); |
3a7f6c99 MB |
918 | |
919 | switch (r) { | |
3f1e9070 | 920 | /* async */ |
3a7f6c99 MB |
921 | case -EBUSY: |
922 | wait_for_completion(&ctx->restart); | |
16735d02 | 923 | reinit_completion(&ctx->restart); |
3a7f6c99 MB |
924 | /* fall through*/ |
925 | case -EINPROGRESS: | |
610f2de3 | 926 | ctx->req = NULL; |
c66029f4 | 927 | ctx->cc_sector++; |
3f1e9070 MB |
928 | continue; |
929 | ||
930 | /* sync */ | |
3a7f6c99 | 931 | case 0: |
40b6229b | 932 | atomic_dec(&ctx->cc_pending); |
c66029f4 | 933 | ctx->cc_sector++; |
c7f1b204 | 934 | cond_resched(); |
3a7f6c99 | 935 | continue; |
3a7f6c99 | 936 | |
3f1e9070 MB |
937 | /* error */ |
938 | default: | |
40b6229b | 939 | atomic_dec(&ctx->cc_pending); |
3f1e9070 MB |
940 | return r; |
941 | } | |
1da177e4 LT |
942 | } |
943 | ||
3f1e9070 | 944 | return 0; |
1da177e4 LT |
945 | } |
946 | ||
cf2f1abf MP |
947 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone); |
948 | ||
1da177e4 LT |
949 | /* |
950 | * Generate a new unfragmented bio with the given size | |
951 | * This should never violate the device limitations | |
1da177e4 | 952 | */ |
cf2f1abf | 953 | static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size) |
1da177e4 | 954 | { |
49a8a920 | 955 | struct crypt_config *cc = io->cc; |
8b004457 | 956 | struct bio *clone; |
1da177e4 | 957 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
b4e3ca1a | 958 | gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM; |
91e10625 MB |
959 | unsigned i, len; |
960 | struct page *page; | |
cf2f1abf | 961 | struct bio_vec *bvec; |
1da177e4 | 962 | |
2f9941b6 | 963 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
8b004457 | 964 | if (!clone) |
1da177e4 | 965 | return NULL; |
1da177e4 | 966 | |
027581f3 | 967 | clone_init(io, clone); |
6a24c718 | 968 | |
f97380bc | 969 | for (i = 0; i < nr_iovecs; i++) { |
91e10625 | 970 | page = mempool_alloc(cc->page_pool, gfp_mask); |
1da177e4 | 971 | |
91e10625 MB |
972 | len = (size > PAGE_SIZE) ? PAGE_SIZE : size; |
973 | ||
cf2f1abf MP |
974 | bvec = &clone->bi_io_vec[clone->bi_vcnt++]; |
975 | bvec->bv_page = page; | |
976 | bvec->bv_len = len; | |
977 | bvec->bv_offset = 0; | |
1da177e4 | 978 | |
cf2f1abf | 979 | clone->bi_iter.bi_size += len; |
1da177e4 | 980 | |
cf2f1abf | 981 | size -= len; |
1da177e4 LT |
982 | } |
983 | ||
8b004457 | 984 | return clone; |
1da177e4 LT |
985 | } |
986 | ||
644bd2f0 | 987 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) |
1da177e4 | 988 | { |
644bd2f0 | 989 | unsigned int i; |
1da177e4 LT |
990 | struct bio_vec *bv; |
991 | ||
cb34e057 | 992 | bio_for_each_segment_all(bv, clone, i) { |
1da177e4 LT |
993 | BUG_ON(!bv->bv_page); |
994 | mempool_free(bv->bv_page, cc->page_pool); | |
995 | bv->bv_page = NULL; | |
996 | } | |
997 | } | |
998 | ||
298a9fa0 MP |
999 | static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc, |
1000 | struct bio *bio, sector_t sector) | |
dc440d1e | 1001 | { |
49a8a920 | 1002 | io->cc = cc; |
dc440d1e MB |
1003 | io->base_bio = bio; |
1004 | io->sector = sector; | |
1005 | io->error = 0; | |
610f2de3 | 1006 | io->ctx.req = NULL; |
40b6229b | 1007 | atomic_set(&io->io_pending, 0); |
dc440d1e MB |
1008 | } |
1009 | ||
3e1a8bdd MB |
1010 | static void crypt_inc_pending(struct dm_crypt_io *io) |
1011 | { | |
40b6229b | 1012 | atomic_inc(&io->io_pending); |
3e1a8bdd MB |
1013 | } |
1014 | ||
1da177e4 LT |
1015 | /* |
1016 | * One of the bios was finished. Check for completion of | |
1017 | * the whole request and correctly clean up the buffer. | |
1018 | */ | |
5742fd77 | 1019 | static void crypt_dec_pending(struct dm_crypt_io *io) |
1da177e4 | 1020 | { |
49a8a920 | 1021 | struct crypt_config *cc = io->cc; |
b35f8caa | 1022 | struct bio *base_bio = io->base_bio; |
b35f8caa | 1023 | int error = io->error; |
1da177e4 | 1024 | |
40b6229b | 1025 | if (!atomic_dec_and_test(&io->io_pending)) |
1da177e4 LT |
1026 | return; |
1027 | ||
610f2de3 | 1028 | if (io->ctx.req) |
298a9fa0 MP |
1029 | crypt_free_req(cc, io->ctx.req, base_bio); |
1030 | if (io != dm_per_bio_data(base_bio, cc->per_bio_data_size)) | |
1031 | mempool_free(io, cc->io_pool); | |
b35f8caa | 1032 | |
cf2f1abf | 1033 | bio_endio(base_bio, error); |
1da177e4 LT |
1034 | } |
1035 | ||
1036 | /* | |
cabf08e4 | 1037 | * kcryptd/kcryptd_io: |
1da177e4 LT |
1038 | * |
1039 | * Needed because it would be very unwise to do decryption in an | |
23541d2d | 1040 | * interrupt context. |
cabf08e4 MB |
1041 | * |
1042 | * kcryptd performs the actual encryption or decryption. | |
1043 | * | |
1044 | * kcryptd_io performs the IO submission. | |
1045 | * | |
1046 | * They must be separated as otherwise the final stages could be | |
1047 | * starved by new requests which can block in the first stages due | |
1048 | * to memory allocation. | |
c0297721 AK |
1049 | * |
1050 | * The work is done per CPU global for all dm-crypt instances. | |
1051 | * They should not depend on each other and do not block. | |
1da177e4 | 1052 | */ |
6712ecf8 | 1053 | static void crypt_endio(struct bio *clone, int error) |
8b004457 | 1054 | { |
028867ac | 1055 | struct dm_crypt_io *io = clone->bi_private; |
49a8a920 | 1056 | struct crypt_config *cc = io->cc; |
ee7a491e | 1057 | unsigned rw = bio_data_dir(clone); |
8b004457 | 1058 | |
adfe4770 MB |
1059 | if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error)) |
1060 | error = -EIO; | |
1061 | ||
8b004457 | 1062 | /* |
6712ecf8 | 1063 | * free the processed pages |
8b004457 | 1064 | */ |
ee7a491e | 1065 | if (rw == WRITE) |
644bd2f0 | 1066 | crypt_free_buffer_pages(cc, clone); |
8b004457 MB |
1067 | |
1068 | bio_put(clone); | |
8b004457 | 1069 | |
ee7a491e MB |
1070 | if (rw == READ && !error) { |
1071 | kcryptd_queue_crypt(io); | |
1072 | return; | |
1073 | } | |
5742fd77 MB |
1074 | |
1075 | if (unlikely(error)) | |
1076 | io->error = error; | |
1077 | ||
1078 | crypt_dec_pending(io); | |
8b004457 MB |
1079 | } |
1080 | ||
028867ac | 1081 | static void clone_init(struct dm_crypt_io *io, struct bio *clone) |
8b004457 | 1082 | { |
49a8a920 | 1083 | struct crypt_config *cc = io->cc; |
8b004457 MB |
1084 | |
1085 | clone->bi_private = io; | |
1086 | clone->bi_end_io = crypt_endio; | |
1087 | clone->bi_bdev = cc->dev->bdev; | |
1088 | clone->bi_rw = io->base_bio->bi_rw; | |
1089 | } | |
1090 | ||
20c82538 | 1091 | static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) |
8b004457 | 1092 | { |
49a8a920 | 1093 | struct crypt_config *cc = io->cc; |
8b004457 MB |
1094 | struct bio *base_bio = io->base_bio; |
1095 | struct bio *clone; | |
93e605c2 | 1096 | |
8b004457 MB |
1097 | /* |
1098 | * The block layer might modify the bvec array, so always | |
1099 | * copy the required bvecs because we need the original | |
1100 | * one in order to decrypt the whole bio data *afterwards*. | |
1101 | */ | |
bf800ef1 | 1102 | clone = bio_clone_bioset(base_bio, gfp, cc->bs); |
7eaceacc | 1103 | if (!clone) |
20c82538 | 1104 | return 1; |
8b004457 | 1105 | |
20c82538 MB |
1106 | crypt_inc_pending(io); |
1107 | ||
8b004457 | 1108 | clone_init(io, clone); |
4f024f37 | 1109 | clone->bi_iter.bi_sector = cc->start + io->sector; |
8b004457 | 1110 | |
93e605c2 | 1111 | generic_make_request(clone); |
20c82538 | 1112 | return 0; |
8b004457 MB |
1113 | } |
1114 | ||
4e4eef64 MB |
1115 | static void kcryptd_io_write(struct dm_crypt_io *io) |
1116 | { | |
95497a96 | 1117 | struct bio *clone = io->ctx.bio_out; |
95497a96 | 1118 | generic_make_request(clone); |
4e4eef64 MB |
1119 | } |
1120 | ||
395b167c AK |
1121 | static void kcryptd_io(struct work_struct *work) |
1122 | { | |
1123 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); | |
1124 | ||
20c82538 MB |
1125 | if (bio_data_dir(io->base_bio) == READ) { |
1126 | crypt_inc_pending(io); | |
1127 | if (kcryptd_io_read(io, GFP_NOIO)) | |
1128 | io->error = -ENOMEM; | |
1129 | crypt_dec_pending(io); | |
1130 | } else | |
395b167c AK |
1131 | kcryptd_io_write(io); |
1132 | } | |
1133 | ||
1134 | static void kcryptd_queue_io(struct dm_crypt_io *io) | |
1135 | { | |
49a8a920 | 1136 | struct crypt_config *cc = io->cc; |
395b167c AK |
1137 | |
1138 | INIT_WORK(&io->work, kcryptd_io); | |
1139 | queue_work(cc->io_queue, &io->work); | |
1140 | } | |
1141 | ||
72c6e7af | 1142 | static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) |
4e4eef64 | 1143 | { |
dec1cedf | 1144 | struct bio *clone = io->ctx.bio_out; |
49a8a920 | 1145 | struct crypt_config *cc = io->cc; |
dec1cedf | 1146 | |
72c6e7af | 1147 | if (unlikely(io->error < 0)) { |
dec1cedf MB |
1148 | crypt_free_buffer_pages(cc, clone); |
1149 | bio_put(clone); | |
6c031f41 | 1150 | crypt_dec_pending(io); |
dec1cedf MB |
1151 | return; |
1152 | } | |
1153 | ||
1154 | /* crypt_convert should have filled the clone bio */ | |
003b5c57 | 1155 | BUG_ON(io->ctx.iter_out.bi_size); |
dec1cedf | 1156 | |
4f024f37 | 1157 | clone->bi_iter.bi_sector = cc->start + io->sector; |
899c95d3 | 1158 | |
95497a96 MB |
1159 | if (async) |
1160 | kcryptd_queue_io(io); | |
1e37bb8e | 1161 | else |
95497a96 | 1162 | generic_make_request(clone); |
4e4eef64 MB |
1163 | } |
1164 | ||
fc5a5e9a | 1165 | static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) |
8b004457 | 1166 | { |
49a8a920 | 1167 | struct crypt_config *cc = io->cc; |
8b004457 | 1168 | struct bio *clone; |
c8081618 | 1169 | int crypt_finished; |
b635b00e | 1170 | sector_t sector = io->sector; |
dec1cedf | 1171 | int r; |
8b004457 | 1172 | |
fc5a5e9a MB |
1173 | /* |
1174 | * Prevent io from disappearing until this function completes. | |
1175 | */ | |
1176 | crypt_inc_pending(io); | |
b635b00e | 1177 | crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); |
fc5a5e9a | 1178 | |
cf2f1abf MP |
1179 | clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size); |
1180 | if (unlikely(!clone)) { | |
1181 | io->error = -EIO; | |
1182 | goto dec; | |
1183 | } | |
c8081618 | 1184 | |
cf2f1abf MP |
1185 | io->ctx.bio_out = clone; |
1186 | io->ctx.iter_out = clone->bi_iter; | |
b635b00e | 1187 | |
cf2f1abf | 1188 | sector += bio_sectors(clone); |
93e605c2 | 1189 | |
cf2f1abf MP |
1190 | crypt_inc_pending(io); |
1191 | r = crypt_convert(cc, &io->ctx); | |
1192 | if (r) | |
1193 | io->error = -EIO; | |
1194 | crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending); | |
933f01d4 | 1195 | |
cf2f1abf MP |
1196 | /* Encryption was already finished, submit io now */ |
1197 | if (crypt_finished) { | |
1198 | kcryptd_crypt_write_io_submit(io, 0); | |
1199 | io->sector = sector; | |
93e605c2 | 1200 | } |
899c95d3 | 1201 | |
cf2f1abf | 1202 | dec: |
899c95d3 | 1203 | crypt_dec_pending(io); |
84131db6 MB |
1204 | } |
1205 | ||
72c6e7af | 1206 | static void kcryptd_crypt_read_done(struct dm_crypt_io *io) |
5742fd77 | 1207 | { |
5742fd77 MB |
1208 | crypt_dec_pending(io); |
1209 | } | |
1210 | ||
4e4eef64 | 1211 | static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) |
8b004457 | 1212 | { |
49a8a920 | 1213 | struct crypt_config *cc = io->cc; |
5742fd77 | 1214 | int r = 0; |
1da177e4 | 1215 | |
3e1a8bdd | 1216 | crypt_inc_pending(io); |
3a7f6c99 | 1217 | |
53017030 | 1218 | crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, |
0c395b0f | 1219 | io->sector); |
1da177e4 | 1220 | |
5742fd77 | 1221 | r = crypt_convert(cc, &io->ctx); |
72c6e7af MP |
1222 | if (r < 0) |
1223 | io->error = -EIO; | |
5742fd77 | 1224 | |
40b6229b | 1225 | if (atomic_dec_and_test(&io->ctx.cc_pending)) |
72c6e7af | 1226 | kcryptd_crypt_read_done(io); |
3a7f6c99 MB |
1227 | |
1228 | crypt_dec_pending(io); | |
1da177e4 LT |
1229 | } |
1230 | ||
95497a96 MB |
1231 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
1232 | int error) | |
1233 | { | |
b2174eeb HY |
1234 | struct dm_crypt_request *dmreq = async_req->data; |
1235 | struct convert_context *ctx = dmreq->ctx; | |
95497a96 | 1236 | struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); |
49a8a920 | 1237 | struct crypt_config *cc = io->cc; |
95497a96 MB |
1238 | |
1239 | if (error == -EINPROGRESS) { | |
1240 | complete(&ctx->restart); | |
1241 | return; | |
1242 | } | |
1243 | ||
2dc5327d MB |
1244 | if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) |
1245 | error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq); | |
1246 | ||
72c6e7af MP |
1247 | if (error < 0) |
1248 | io->error = -EIO; | |
1249 | ||
298a9fa0 | 1250 | crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio); |
95497a96 | 1251 | |
40b6229b | 1252 | if (!atomic_dec_and_test(&ctx->cc_pending)) |
95497a96 MB |
1253 | return; |
1254 | ||
1255 | if (bio_data_dir(io->base_bio) == READ) | |
72c6e7af | 1256 | kcryptd_crypt_read_done(io); |
95497a96 | 1257 | else |
72c6e7af | 1258 | kcryptd_crypt_write_io_submit(io, 1); |
95497a96 MB |
1259 | } |
1260 | ||
395b167c | 1261 | static void kcryptd_crypt(struct work_struct *work) |
1da177e4 | 1262 | { |
028867ac | 1263 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
8b004457 | 1264 | |
cabf08e4 | 1265 | if (bio_data_dir(io->base_bio) == READ) |
395b167c | 1266 | kcryptd_crypt_read_convert(io); |
4e4eef64 | 1267 | else |
395b167c | 1268 | kcryptd_crypt_write_convert(io); |
cabf08e4 MB |
1269 | } |
1270 | ||
395b167c | 1271 | static void kcryptd_queue_crypt(struct dm_crypt_io *io) |
cabf08e4 | 1272 | { |
49a8a920 | 1273 | struct crypt_config *cc = io->cc; |
cabf08e4 | 1274 | |
395b167c AK |
1275 | INIT_WORK(&io->work, kcryptd_crypt); |
1276 | queue_work(cc->crypt_queue, &io->work); | |
1da177e4 LT |
1277 | } |
1278 | ||
1279 | /* | |
1280 | * Decode key from its hex representation | |
1281 | */ | |
1282 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) | |
1283 | { | |
1284 | char buffer[3]; | |
1da177e4 LT |
1285 | unsigned int i; |
1286 | ||
1287 | buffer[2] = '\0'; | |
1288 | ||
8b004457 | 1289 | for (i = 0; i < size; i++) { |
1da177e4 LT |
1290 | buffer[0] = *hex++; |
1291 | buffer[1] = *hex++; | |
1292 | ||
1a66a08a | 1293 | if (kstrtou8(buffer, 16, &key[i])) |
1da177e4 LT |
1294 | return -EINVAL; |
1295 | } | |
1296 | ||
1297 | if (*hex != '\0') | |
1298 | return -EINVAL; | |
1299 | ||
1300 | return 0; | |
1301 | } | |
1302 | ||
fd2d231f | 1303 | static void crypt_free_tfms(struct crypt_config *cc) |
d1f96423 | 1304 | { |
d1f96423 MB |
1305 | unsigned i; |
1306 | ||
fd2d231f MP |
1307 | if (!cc->tfms) |
1308 | return; | |
1309 | ||
d1f96423 | 1310 | for (i = 0; i < cc->tfms_count; i++) |
fd2d231f MP |
1311 | if (cc->tfms[i] && !IS_ERR(cc->tfms[i])) { |
1312 | crypto_free_ablkcipher(cc->tfms[i]); | |
1313 | cc->tfms[i] = NULL; | |
d1f96423 | 1314 | } |
fd2d231f MP |
1315 | |
1316 | kfree(cc->tfms); | |
1317 | cc->tfms = NULL; | |
d1f96423 MB |
1318 | } |
1319 | ||
fd2d231f | 1320 | static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) |
d1f96423 | 1321 | { |
d1f96423 MB |
1322 | unsigned i; |
1323 | int err; | |
1324 | ||
fd2d231f MP |
1325 | cc->tfms = kmalloc(cc->tfms_count * sizeof(struct crypto_ablkcipher *), |
1326 | GFP_KERNEL); | |
1327 | if (!cc->tfms) | |
1328 | return -ENOMEM; | |
1329 | ||
d1f96423 | 1330 | for (i = 0; i < cc->tfms_count; i++) { |
fd2d231f MP |
1331 | cc->tfms[i] = crypto_alloc_ablkcipher(ciphermode, 0, 0); |
1332 | if (IS_ERR(cc->tfms[i])) { | |
1333 | err = PTR_ERR(cc->tfms[i]); | |
1334 | crypt_free_tfms(cc); | |
d1f96423 MB |
1335 | return err; |
1336 | } | |
1337 | } | |
1338 | ||
1339 | return 0; | |
1340 | } | |
1341 | ||
c0297721 AK |
1342 | static int crypt_setkey_allcpus(struct crypt_config *cc) |
1343 | { | |
da31a078 | 1344 | unsigned subkey_size; |
fd2d231f MP |
1345 | int err = 0, i, r; |
1346 | ||
da31a078 MB |
1347 | /* Ignore extra keys (which are used for IV etc) */ |
1348 | subkey_size = (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); | |
1349 | ||
fd2d231f MP |
1350 | for (i = 0; i < cc->tfms_count; i++) { |
1351 | r = crypto_ablkcipher_setkey(cc->tfms[i], | |
1352 | cc->key + (i * subkey_size), | |
1353 | subkey_size); | |
1354 | if (r) | |
1355 | err = r; | |
c0297721 AK |
1356 | } |
1357 | ||
1358 | return err; | |
1359 | } | |
1360 | ||
e48d4bbf MB |
1361 | static int crypt_set_key(struct crypt_config *cc, char *key) |
1362 | { | |
de8be5ac MB |
1363 | int r = -EINVAL; |
1364 | int key_string_len = strlen(key); | |
1365 | ||
69a8cfcd | 1366 | /* The key size may not be changed. */ |
de8be5ac MB |
1367 | if (cc->key_size != (key_string_len >> 1)) |
1368 | goto out; | |
e48d4bbf | 1369 | |
69a8cfcd MB |
1370 | /* Hyphen (which gives a key_size of zero) means there is no key. */ |
1371 | if (!cc->key_size && strcmp(key, "-")) | |
de8be5ac | 1372 | goto out; |
e48d4bbf | 1373 | |
69a8cfcd | 1374 | if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0) |
de8be5ac | 1375 | goto out; |
e48d4bbf MB |
1376 | |
1377 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1378 | ||
de8be5ac MB |
1379 | r = crypt_setkey_allcpus(cc); |
1380 | ||
1381 | out: | |
1382 | /* Hex key string not needed after here, so wipe it. */ | |
1383 | memset(key, '0', key_string_len); | |
1384 | ||
1385 | return r; | |
e48d4bbf MB |
1386 | } |
1387 | ||
1388 | static int crypt_wipe_key(struct crypt_config *cc) | |
1389 | { | |
1390 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1391 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); | |
c0297721 AK |
1392 | |
1393 | return crypt_setkey_allcpus(cc); | |
e48d4bbf MB |
1394 | } |
1395 | ||
28513fcc MB |
1396 | static void crypt_dtr(struct dm_target *ti) |
1397 | { | |
1398 | struct crypt_config *cc = ti->private; | |
1399 | ||
1400 | ti->private = NULL; | |
1401 | ||
1402 | if (!cc) | |
1403 | return; | |
1404 | ||
1405 | if (cc->io_queue) | |
1406 | destroy_workqueue(cc->io_queue); | |
1407 | if (cc->crypt_queue) | |
1408 | destroy_workqueue(cc->crypt_queue); | |
1409 | ||
fd2d231f MP |
1410 | crypt_free_tfms(cc); |
1411 | ||
28513fcc MB |
1412 | if (cc->bs) |
1413 | bioset_free(cc->bs); | |
1414 | ||
1415 | if (cc->page_pool) | |
1416 | mempool_destroy(cc->page_pool); | |
1417 | if (cc->req_pool) | |
1418 | mempool_destroy(cc->req_pool); | |
1419 | if (cc->io_pool) | |
1420 | mempool_destroy(cc->io_pool); | |
1421 | ||
1422 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) | |
1423 | cc->iv_gen_ops->dtr(cc); | |
1424 | ||
28513fcc MB |
1425 | if (cc->dev) |
1426 | dm_put_device(ti, cc->dev); | |
1427 | ||
5ebaee6d | 1428 | kzfree(cc->cipher); |
7dbcd137 | 1429 | kzfree(cc->cipher_string); |
28513fcc MB |
1430 | |
1431 | /* Must zero key material before freeing */ | |
1432 | kzfree(cc); | |
1433 | } | |
1434 | ||
5ebaee6d MB |
1435 | static int crypt_ctr_cipher(struct dm_target *ti, |
1436 | char *cipher_in, char *key) | |
1da177e4 | 1437 | { |
5ebaee6d | 1438 | struct crypt_config *cc = ti->private; |
d1f96423 | 1439 | char *tmp, *cipher, *chainmode, *ivmode, *ivopts, *keycount; |
5ebaee6d | 1440 | char *cipher_api = NULL; |
fd2d231f | 1441 | int ret = -EINVAL; |
31998ef1 | 1442 | char dummy; |
1da177e4 | 1443 | |
5ebaee6d MB |
1444 | /* Convert to crypto api definition? */ |
1445 | if (strchr(cipher_in, '(')) { | |
1446 | ti->error = "Bad cipher specification"; | |
1da177e4 LT |
1447 | return -EINVAL; |
1448 | } | |
1449 | ||
7dbcd137 MB |
1450 | cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); |
1451 | if (!cc->cipher_string) | |
1452 | goto bad_mem; | |
1453 | ||
5ebaee6d MB |
1454 | /* |
1455 | * Legacy dm-crypt cipher specification | |
d1f96423 | 1456 | * cipher[:keycount]-mode-iv:ivopts |
5ebaee6d MB |
1457 | */ |
1458 | tmp = cipher_in; | |
d1f96423 MB |
1459 | keycount = strsep(&tmp, "-"); |
1460 | cipher = strsep(&keycount, ":"); | |
1461 | ||
1462 | if (!keycount) | |
1463 | cc->tfms_count = 1; | |
31998ef1 | 1464 | else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || |
d1f96423 MB |
1465 | !is_power_of_2(cc->tfms_count)) { |
1466 | ti->error = "Bad cipher key count specification"; | |
1467 | return -EINVAL; | |
1468 | } | |
1469 | cc->key_parts = cc->tfms_count; | |
da31a078 | 1470 | cc->key_extra_size = 0; |
5ebaee6d MB |
1471 | |
1472 | cc->cipher = kstrdup(cipher, GFP_KERNEL); | |
1473 | if (!cc->cipher) | |
1474 | goto bad_mem; | |
1475 | ||
1da177e4 LT |
1476 | chainmode = strsep(&tmp, "-"); |
1477 | ivopts = strsep(&tmp, "-"); | |
1478 | ivmode = strsep(&ivopts, ":"); | |
1479 | ||
1480 | if (tmp) | |
5ebaee6d | 1481 | DMWARN("Ignoring unexpected additional cipher options"); |
1da177e4 | 1482 | |
7dbcd137 MB |
1483 | /* |
1484 | * For compatibility with the original dm-crypt mapping format, if | |
1485 | * only the cipher name is supplied, use cbc-plain. | |
1486 | */ | |
5ebaee6d | 1487 | if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) { |
1da177e4 LT |
1488 | chainmode = "cbc"; |
1489 | ivmode = "plain"; | |
1490 | } | |
1491 | ||
d1806f6a | 1492 | if (strcmp(chainmode, "ecb") && !ivmode) { |
5ebaee6d MB |
1493 | ti->error = "IV mechanism required"; |
1494 | return -EINVAL; | |
1da177e4 LT |
1495 | } |
1496 | ||
5ebaee6d MB |
1497 | cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); |
1498 | if (!cipher_api) | |
1499 | goto bad_mem; | |
1500 | ||
1501 | ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, | |
1502 | "%s(%s)", chainmode, cipher); | |
1503 | if (ret < 0) { | |
1504 | kfree(cipher_api); | |
1505 | goto bad_mem; | |
1da177e4 LT |
1506 | } |
1507 | ||
5ebaee6d | 1508 | /* Allocate cipher */ |
fd2d231f MP |
1509 | ret = crypt_alloc_tfms(cc, cipher_api); |
1510 | if (ret < 0) { | |
1511 | ti->error = "Error allocating crypto tfm"; | |
1512 | goto bad; | |
1da177e4 | 1513 | } |
1da177e4 | 1514 | |
5ebaee6d | 1515 | /* Initialize IV */ |
c0297721 | 1516 | cc->iv_size = crypto_ablkcipher_ivsize(any_tfm(cc)); |
5ebaee6d MB |
1517 | if (cc->iv_size) |
1518 | /* at least a 64 bit sector number should fit in our buffer */ | |
1519 | cc->iv_size = max(cc->iv_size, | |
1520 | (unsigned int)(sizeof(u64) / sizeof(u8))); | |
1521 | else if (ivmode) { | |
1522 | DMWARN("Selected cipher does not support IVs"); | |
1523 | ivmode = NULL; | |
1524 | } | |
1525 | ||
1526 | /* Choose ivmode, see comments at iv code. */ | |
1da177e4 LT |
1527 | if (ivmode == NULL) |
1528 | cc->iv_gen_ops = NULL; | |
1529 | else if (strcmp(ivmode, "plain") == 0) | |
1530 | cc->iv_gen_ops = &crypt_iv_plain_ops; | |
61afef61 MB |
1531 | else if (strcmp(ivmode, "plain64") == 0) |
1532 | cc->iv_gen_ops = &crypt_iv_plain64_ops; | |
1da177e4 LT |
1533 | else if (strcmp(ivmode, "essiv") == 0) |
1534 | cc->iv_gen_ops = &crypt_iv_essiv_ops; | |
48527fa7 RS |
1535 | else if (strcmp(ivmode, "benbi") == 0) |
1536 | cc->iv_gen_ops = &crypt_iv_benbi_ops; | |
46b47730 LN |
1537 | else if (strcmp(ivmode, "null") == 0) |
1538 | cc->iv_gen_ops = &crypt_iv_null_ops; | |
34745785 MB |
1539 | else if (strcmp(ivmode, "lmk") == 0) { |
1540 | cc->iv_gen_ops = &crypt_iv_lmk_ops; | |
ed04d981 MB |
1541 | /* |
1542 | * Version 2 and 3 is recognised according | |
34745785 MB |
1543 | * to length of provided multi-key string. |
1544 | * If present (version 3), last key is used as IV seed. | |
ed04d981 | 1545 | * All keys (including IV seed) are always the same size. |
34745785 | 1546 | */ |
da31a078 | 1547 | if (cc->key_size % cc->key_parts) { |
34745785 | 1548 | cc->key_parts++; |
da31a078 MB |
1549 | cc->key_extra_size = cc->key_size / cc->key_parts; |
1550 | } | |
ed04d981 MB |
1551 | } else if (strcmp(ivmode, "tcw") == 0) { |
1552 | cc->iv_gen_ops = &crypt_iv_tcw_ops; | |
1553 | cc->key_parts += 2; /* IV + whitening */ | |
1554 | cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; | |
34745785 | 1555 | } else { |
5ebaee6d | 1556 | ret = -EINVAL; |
72d94861 | 1557 | ti->error = "Invalid IV mode"; |
28513fcc | 1558 | goto bad; |
1da177e4 LT |
1559 | } |
1560 | ||
da31a078 MB |
1561 | /* Initialize and set key */ |
1562 | ret = crypt_set_key(cc, key); | |
1563 | if (ret < 0) { | |
1564 | ti->error = "Error decoding and setting key"; | |
1565 | goto bad; | |
1566 | } | |
1567 | ||
28513fcc MB |
1568 | /* Allocate IV */ |
1569 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { | |
1570 | ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); | |
1571 | if (ret < 0) { | |
1572 | ti->error = "Error creating IV"; | |
1573 | goto bad; | |
1574 | } | |
1575 | } | |
1da177e4 | 1576 | |
28513fcc MB |
1577 | /* Initialize IV (set keys for ESSIV etc) */ |
1578 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) { | |
1579 | ret = cc->iv_gen_ops->init(cc); | |
1580 | if (ret < 0) { | |
1581 | ti->error = "Error initialising IV"; | |
1582 | goto bad; | |
1583 | } | |
b95bf2d3 MB |
1584 | } |
1585 | ||
5ebaee6d MB |
1586 | ret = 0; |
1587 | bad: | |
1588 | kfree(cipher_api); | |
1589 | return ret; | |
1590 | ||
1591 | bad_mem: | |
1592 | ti->error = "Cannot allocate cipher strings"; | |
1593 | return -ENOMEM; | |
1594 | } | |
1595 | ||
1596 | /* | |
1597 | * Construct an encryption mapping: | |
1598 | * <cipher> <key> <iv_offset> <dev_path> <start> | |
1599 | */ | |
1600 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
1601 | { | |
1602 | struct crypt_config *cc; | |
772ae5f5 | 1603 | unsigned int key_size, opt_params; |
5ebaee6d MB |
1604 | unsigned long long tmpll; |
1605 | int ret; | |
d49ec52f | 1606 | size_t iv_size_padding; |
772ae5f5 MB |
1607 | struct dm_arg_set as; |
1608 | const char *opt_string; | |
31998ef1 | 1609 | char dummy; |
772ae5f5 MB |
1610 | |
1611 | static struct dm_arg _args[] = { | |
f3396c58 | 1612 | {0, 2, "Invalid number of feature args"}, |
772ae5f5 | 1613 | }; |
5ebaee6d | 1614 | |
772ae5f5 | 1615 | if (argc < 5) { |
5ebaee6d MB |
1616 | ti->error = "Not enough arguments"; |
1617 | return -EINVAL; | |
1da177e4 LT |
1618 | } |
1619 | ||
5ebaee6d MB |
1620 | key_size = strlen(argv[1]) >> 1; |
1621 | ||
1622 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); | |
1623 | if (!cc) { | |
1624 | ti->error = "Cannot allocate encryption context"; | |
1625 | return -ENOMEM; | |
1626 | } | |
69a8cfcd | 1627 | cc->key_size = key_size; |
5ebaee6d MB |
1628 | |
1629 | ti->private = cc; | |
1630 | ret = crypt_ctr_cipher(ti, argv[0], argv[1]); | |
1631 | if (ret < 0) | |
1632 | goto bad; | |
1633 | ||
28513fcc | 1634 | ret = -ENOMEM; |
93d2341c | 1635 | cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool); |
1da177e4 | 1636 | if (!cc->io_pool) { |
72d94861 | 1637 | ti->error = "Cannot allocate crypt io mempool"; |
28513fcc | 1638 | goto bad; |
1da177e4 LT |
1639 | } |
1640 | ||
ddd42edf | 1641 | cc->dmreq_start = sizeof(struct ablkcipher_request); |
c0297721 | 1642 | cc->dmreq_start += crypto_ablkcipher_reqsize(any_tfm(cc)); |
d49ec52f MP |
1643 | cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request)); |
1644 | ||
1645 | if (crypto_ablkcipher_alignmask(any_tfm(cc)) < CRYPTO_MINALIGN) { | |
1646 | /* Allocate the padding exactly */ | |
1647 | iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request)) | |
1648 | & crypto_ablkcipher_alignmask(any_tfm(cc)); | |
1649 | } else { | |
1650 | /* | |
1651 | * If the cipher requires greater alignment than kmalloc | |
1652 | * alignment, we don't know the exact position of the | |
1653 | * initialization vector. We must assume worst case. | |
1654 | */ | |
1655 | iv_size_padding = crypto_ablkcipher_alignmask(any_tfm(cc)); | |
1656 | } | |
ddd42edf MB |
1657 | |
1658 | cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + | |
d49ec52f | 1659 | sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size); |
ddd42edf MB |
1660 | if (!cc->req_pool) { |
1661 | ti->error = "Cannot allocate crypt request mempool"; | |
28513fcc | 1662 | goto bad; |
ddd42edf | 1663 | } |
ddd42edf | 1664 | |
298a9fa0 | 1665 | cc->per_bio_data_size = ti->per_bio_data_size = |
d49ec52f MP |
1666 | ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + |
1667 | sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size, | |
1668 | ARCH_KMALLOC_MINALIGN); | |
298a9fa0 | 1669 | |
cf2f1abf | 1670 | cc->page_pool = mempool_create_page_pool(BIO_MAX_PAGES, 0); |
1da177e4 | 1671 | if (!cc->page_pool) { |
72d94861 | 1672 | ti->error = "Cannot allocate page mempool"; |
28513fcc | 1673 | goto bad; |
1da177e4 LT |
1674 | } |
1675 | ||
bb799ca0 | 1676 | cc->bs = bioset_create(MIN_IOS, 0); |
6a24c718 MB |
1677 | if (!cc->bs) { |
1678 | ti->error = "Cannot allocate crypt bioset"; | |
28513fcc | 1679 | goto bad; |
6a24c718 MB |
1680 | } |
1681 | ||
28513fcc | 1682 | ret = -EINVAL; |
31998ef1 | 1683 | if (sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1684 | ti->error = "Invalid iv_offset sector"; |
28513fcc | 1685 | goto bad; |
1da177e4 | 1686 | } |
4ee218cd | 1687 | cc->iv_offset = tmpll; |
1da177e4 | 1688 | |
28513fcc MB |
1689 | if (dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev)) { |
1690 | ti->error = "Device lookup failed"; | |
1691 | goto bad; | |
1692 | } | |
1693 | ||
31998ef1 | 1694 | if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1695 | ti->error = "Invalid device sector"; |
28513fcc | 1696 | goto bad; |
1da177e4 | 1697 | } |
4ee218cd | 1698 | cc->start = tmpll; |
1da177e4 | 1699 | |
772ae5f5 MB |
1700 | argv += 5; |
1701 | argc -= 5; | |
1702 | ||
1703 | /* Optional parameters */ | |
1704 | if (argc) { | |
1705 | as.argc = argc; | |
1706 | as.argv = argv; | |
1707 | ||
1708 | ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); | |
1709 | if (ret) | |
1710 | goto bad; | |
1711 | ||
f3396c58 MP |
1712 | while (opt_params--) { |
1713 | opt_string = dm_shift_arg(&as); | |
1714 | if (!opt_string) { | |
1715 | ti->error = "Not enough feature arguments"; | |
1716 | goto bad; | |
1717 | } | |
772ae5f5 | 1718 | |
f3396c58 MP |
1719 | if (!strcasecmp(opt_string, "allow_discards")) |
1720 | ti->num_discard_bios = 1; | |
1721 | ||
1722 | else if (!strcasecmp(opt_string, "same_cpu_crypt")) | |
1723 | set_bit(DM_CRYPT_SAME_CPU, &cc->flags); | |
1724 | ||
1725 | else { | |
1726 | ti->error = "Invalid feature arguments"; | |
1727 | goto bad; | |
1728 | } | |
772ae5f5 MB |
1729 | } |
1730 | } | |
1731 | ||
28513fcc | 1732 | ret = -ENOMEM; |
670368a8 | 1733 | cc->io_queue = alloc_workqueue("kcryptd_io", WQ_MEM_RECLAIM, 1); |
cabf08e4 MB |
1734 | if (!cc->io_queue) { |
1735 | ti->error = "Couldn't create kcryptd io queue"; | |
28513fcc | 1736 | goto bad; |
cabf08e4 MB |
1737 | } |
1738 | ||
f3396c58 MP |
1739 | if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) |
1740 | cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1); | |
1741 | else | |
1742 | cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND, | |
1743 | num_online_cpus()); | |
cabf08e4 | 1744 | if (!cc->crypt_queue) { |
9934a8be | 1745 | ti->error = "Couldn't create kcryptd queue"; |
28513fcc | 1746 | goto bad; |
9934a8be MB |
1747 | } |
1748 | ||
55a62eef | 1749 | ti->num_flush_bios = 1; |
0ac55489 | 1750 | ti->discard_zeroes_data_unsupported = true; |
983c7db3 | 1751 | |
1da177e4 LT |
1752 | return 0; |
1753 | ||
28513fcc MB |
1754 | bad: |
1755 | crypt_dtr(ti); | |
1756 | return ret; | |
1da177e4 LT |
1757 | } |
1758 | ||
7de3ee57 | 1759 | static int crypt_map(struct dm_target *ti, struct bio *bio) |
1da177e4 | 1760 | { |
028867ac | 1761 | struct dm_crypt_io *io; |
49a8a920 | 1762 | struct crypt_config *cc = ti->private; |
647c7db1 | 1763 | |
772ae5f5 MB |
1764 | /* |
1765 | * If bio is REQ_FLUSH or REQ_DISCARD, just bypass crypt queues. | |
1766 | * - for REQ_FLUSH device-mapper core ensures that no IO is in-flight | |
1767 | * - for REQ_DISCARD caller must use flush if IO ordering matters | |
1768 | */ | |
1769 | if (unlikely(bio->bi_rw & (REQ_FLUSH | REQ_DISCARD))) { | |
647c7db1 | 1770 | bio->bi_bdev = cc->dev->bdev; |
772ae5f5 | 1771 | if (bio_sectors(bio)) |
4f024f37 KO |
1772 | bio->bi_iter.bi_sector = cc->start + |
1773 | dm_target_offset(ti, bio->bi_iter.bi_sector); | |
647c7db1 MP |
1774 | return DM_MAPIO_REMAPPED; |
1775 | } | |
1da177e4 | 1776 | |
298a9fa0 MP |
1777 | io = dm_per_bio_data(bio, cc->per_bio_data_size); |
1778 | crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector)); | |
1779 | io->ctx.req = (struct ablkcipher_request *)(io + 1); | |
cabf08e4 | 1780 | |
20c82538 MB |
1781 | if (bio_data_dir(io->base_bio) == READ) { |
1782 | if (kcryptd_io_read(io, GFP_NOWAIT)) | |
1783 | kcryptd_queue_io(io); | |
1784 | } else | |
cabf08e4 | 1785 | kcryptd_queue_crypt(io); |
1da177e4 | 1786 | |
d2a7ad29 | 1787 | return DM_MAPIO_SUBMITTED; |
1da177e4 LT |
1788 | } |
1789 | ||
fd7c092e MP |
1790 | static void crypt_status(struct dm_target *ti, status_type_t type, |
1791 | unsigned status_flags, char *result, unsigned maxlen) | |
1da177e4 | 1792 | { |
5ebaee6d | 1793 | struct crypt_config *cc = ti->private; |
fd7c092e | 1794 | unsigned i, sz = 0; |
f3396c58 | 1795 | int num_feature_args = 0; |
1da177e4 LT |
1796 | |
1797 | switch (type) { | |
1798 | case STATUSTYPE_INFO: | |
1799 | result[0] = '\0'; | |
1800 | break; | |
1801 | ||
1802 | case STATUSTYPE_TABLE: | |
7dbcd137 | 1803 | DMEMIT("%s ", cc->cipher_string); |
1da177e4 | 1804 | |
fd7c092e MP |
1805 | if (cc->key_size > 0) |
1806 | for (i = 0; i < cc->key_size; i++) | |
1807 | DMEMIT("%02x", cc->key[i]); | |
1808 | else | |
1809 | DMEMIT("-"); | |
1da177e4 | 1810 | |
4ee218cd AM |
1811 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
1812 | cc->dev->name, (unsigned long long)cc->start); | |
772ae5f5 | 1813 | |
f3396c58 MP |
1814 | num_feature_args += !!ti->num_discard_bios; |
1815 | num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags); | |
1816 | if (num_feature_args) { | |
1817 | DMEMIT(" %d", num_feature_args); | |
1818 | if (ti->num_discard_bios) | |
1819 | DMEMIT(" allow_discards"); | |
1820 | if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) | |
1821 | DMEMIT(" same_cpu_crypt"); | |
1822 | } | |
772ae5f5 | 1823 | |
1da177e4 LT |
1824 | break; |
1825 | } | |
1da177e4 LT |
1826 | } |
1827 | ||
e48d4bbf MB |
1828 | static void crypt_postsuspend(struct dm_target *ti) |
1829 | { | |
1830 | struct crypt_config *cc = ti->private; | |
1831 | ||
1832 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1833 | } | |
1834 | ||
1835 | static int crypt_preresume(struct dm_target *ti) | |
1836 | { | |
1837 | struct crypt_config *cc = ti->private; | |
1838 | ||
1839 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { | |
1840 | DMERR("aborting resume - crypt key is not set."); | |
1841 | return -EAGAIN; | |
1842 | } | |
1843 | ||
1844 | return 0; | |
1845 | } | |
1846 | ||
1847 | static void crypt_resume(struct dm_target *ti) | |
1848 | { | |
1849 | struct crypt_config *cc = ti->private; | |
1850 | ||
1851 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1852 | } | |
1853 | ||
1854 | /* Message interface | |
1855 | * key set <key> | |
1856 | * key wipe | |
1857 | */ | |
1858 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) | |
1859 | { | |
1860 | struct crypt_config *cc = ti->private; | |
542da317 | 1861 | int ret = -EINVAL; |
e48d4bbf MB |
1862 | |
1863 | if (argc < 2) | |
1864 | goto error; | |
1865 | ||
498f0103 | 1866 | if (!strcasecmp(argv[0], "key")) { |
e48d4bbf MB |
1867 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { |
1868 | DMWARN("not suspended during key manipulation."); | |
1869 | return -EINVAL; | |
1870 | } | |
498f0103 | 1871 | if (argc == 3 && !strcasecmp(argv[1], "set")) { |
542da317 MB |
1872 | ret = crypt_set_key(cc, argv[2]); |
1873 | if (ret) | |
1874 | return ret; | |
1875 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) | |
1876 | ret = cc->iv_gen_ops->init(cc); | |
1877 | return ret; | |
1878 | } | |
498f0103 | 1879 | if (argc == 2 && !strcasecmp(argv[1], "wipe")) { |
542da317 MB |
1880 | if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { |
1881 | ret = cc->iv_gen_ops->wipe(cc); | |
1882 | if (ret) | |
1883 | return ret; | |
1884 | } | |
e48d4bbf | 1885 | return crypt_wipe_key(cc); |
542da317 | 1886 | } |
e48d4bbf MB |
1887 | } |
1888 | ||
1889 | error: | |
1890 | DMWARN("unrecognised message received."); | |
1891 | return -EINVAL; | |
1892 | } | |
1893 | ||
d41e26b9 MB |
1894 | static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm, |
1895 | struct bio_vec *biovec, int max_size) | |
1896 | { | |
1897 | struct crypt_config *cc = ti->private; | |
1898 | struct request_queue *q = bdev_get_queue(cc->dev->bdev); | |
1899 | ||
1900 | if (!q->merge_bvec_fn) | |
1901 | return max_size; | |
1902 | ||
1903 | bvm->bi_bdev = cc->dev->bdev; | |
b441a262 | 1904 | bvm->bi_sector = cc->start + dm_target_offset(ti, bvm->bi_sector); |
d41e26b9 MB |
1905 | |
1906 | return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); | |
1907 | } | |
1908 | ||
af4874e0 MS |
1909 | static int crypt_iterate_devices(struct dm_target *ti, |
1910 | iterate_devices_callout_fn fn, void *data) | |
1911 | { | |
1912 | struct crypt_config *cc = ti->private; | |
1913 | ||
5dea271b | 1914 | return fn(ti, cc->dev, cc->start, ti->len, data); |
af4874e0 MS |
1915 | } |
1916 | ||
1da177e4 LT |
1917 | static struct target_type crypt_target = { |
1918 | .name = "crypt", | |
f3396c58 | 1919 | .version = {1, 14, 0}, |
1da177e4 LT |
1920 | .module = THIS_MODULE, |
1921 | .ctr = crypt_ctr, | |
1922 | .dtr = crypt_dtr, | |
1923 | .map = crypt_map, | |
1924 | .status = crypt_status, | |
e48d4bbf MB |
1925 | .postsuspend = crypt_postsuspend, |
1926 | .preresume = crypt_preresume, | |
1927 | .resume = crypt_resume, | |
1928 | .message = crypt_message, | |
d41e26b9 | 1929 | .merge = crypt_merge, |
af4874e0 | 1930 | .iterate_devices = crypt_iterate_devices, |
1da177e4 LT |
1931 | }; |
1932 | ||
1933 | static int __init dm_crypt_init(void) | |
1934 | { | |
1935 | int r; | |
1936 | ||
028867ac | 1937 | _crypt_io_pool = KMEM_CACHE(dm_crypt_io, 0); |
1da177e4 LT |
1938 | if (!_crypt_io_pool) |
1939 | return -ENOMEM; | |
1940 | ||
1da177e4 LT |
1941 | r = dm_register_target(&crypt_target); |
1942 | if (r < 0) { | |
72d94861 | 1943 | DMERR("register failed %d", r); |
9934a8be | 1944 | kmem_cache_destroy(_crypt_io_pool); |
1da177e4 LT |
1945 | } |
1946 | ||
1da177e4 LT |
1947 | return r; |
1948 | } | |
1949 | ||
1950 | static void __exit dm_crypt_exit(void) | |
1951 | { | |
10d3bd09 | 1952 | dm_unregister_target(&crypt_target); |
1da177e4 LT |
1953 | kmem_cache_destroy(_crypt_io_pool); |
1954 | } | |
1955 | ||
1956 | module_init(dm_crypt_init); | |
1957 | module_exit(dm_crypt_exit); | |
1958 | ||
bf14299f | 1959 | MODULE_AUTHOR("Jana Saout <jana@saout.de>"); |
1da177e4 LT |
1960 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); |
1961 | MODULE_LICENSE("GPL"); |