Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2003 Christophe Saout <christophe@saout.de> | |
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; |
393b47ef | 61 | struct dm_crypt_io *base_io; |
53017030 MB |
62 | }; |
63 | ||
01482b76 | 64 | struct dm_crypt_request { |
b2174eeb | 65 | struct convert_context *ctx; |
01482b76 MB |
66 | struct scatterlist sg_in; |
67 | struct scatterlist sg_out; | |
2dc5327d | 68 | sector_t iv_sector; |
01482b76 MB |
69 | }; |
70 | ||
1da177e4 LT |
71 | struct crypt_config; |
72 | ||
73 | struct crypt_iv_operations { | |
74 | int (*ctr)(struct crypt_config *cc, struct dm_target *ti, | |
d469f841 | 75 | const char *opts); |
1da177e4 | 76 | void (*dtr)(struct crypt_config *cc); |
b95bf2d3 | 77 | int (*init)(struct crypt_config *cc); |
542da317 | 78 | int (*wipe)(struct crypt_config *cc); |
2dc5327d MB |
79 | int (*generator)(struct crypt_config *cc, u8 *iv, |
80 | struct dm_crypt_request *dmreq); | |
81 | int (*post)(struct crypt_config *cc, u8 *iv, | |
82 | struct dm_crypt_request *dmreq); | |
1da177e4 LT |
83 | }; |
84 | ||
60473592 | 85 | struct iv_essiv_private { |
b95bf2d3 MB |
86 | struct crypto_hash *hash_tfm; |
87 | u8 *salt; | |
60473592 MB |
88 | }; |
89 | ||
90 | struct iv_benbi_private { | |
91 | int shift; | |
92 | }; | |
93 | ||
34745785 MB |
94 | #define LMK_SEED_SIZE 64 /* hash + 0 */ |
95 | struct iv_lmk_private { | |
96 | struct crypto_shash *hash_tfm; | |
97 | u8 *seed; | |
98 | }; | |
99 | ||
ed04d981 MB |
100 | #define TCW_WHITENING_SIZE 16 |
101 | struct iv_tcw_private { | |
102 | struct crypto_shash *crc32_tfm; | |
103 | u8 *iv_seed; | |
104 | u8 *whitening; | |
105 | }; | |
106 | ||
1da177e4 LT |
107 | /* |
108 | * Crypt: maps a linear range of a block device | |
109 | * and encrypts / decrypts at the same time. | |
110 | */ | |
e48d4bbf | 111 | enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID }; |
c0297721 AK |
112 | |
113 | /* | |
610f2de3 | 114 | * The fields in here must be read only after initialization. |
c0297721 | 115 | */ |
1da177e4 LT |
116 | struct crypt_config { |
117 | struct dm_dev *dev; | |
118 | sector_t start; | |
119 | ||
120 | /* | |
ddd42edf MB |
121 | * pool for per bio private data, crypto requests and |
122 | * encryption requeusts/buffer pages | |
1da177e4 LT |
123 | */ |
124 | mempool_t *io_pool; | |
ddd42edf | 125 | mempool_t *req_pool; |
1da177e4 | 126 | mempool_t *page_pool; |
6a24c718 | 127 | struct bio_set *bs; |
1da177e4 | 128 | |
cabf08e4 MB |
129 | struct workqueue_struct *io_queue; |
130 | struct workqueue_struct *crypt_queue; | |
3f1e9070 | 131 | |
5ebaee6d | 132 | char *cipher; |
7dbcd137 | 133 | char *cipher_string; |
5ebaee6d | 134 | |
1da177e4 | 135 | struct crypt_iv_operations *iv_gen_ops; |
79066ad3 | 136 | union { |
60473592 MB |
137 | struct iv_essiv_private essiv; |
138 | struct iv_benbi_private benbi; | |
34745785 | 139 | struct iv_lmk_private lmk; |
ed04d981 | 140 | struct iv_tcw_private tcw; |
79066ad3 | 141 | } iv_gen_private; |
1da177e4 LT |
142 | sector_t iv_offset; |
143 | unsigned int iv_size; | |
144 | ||
fd2d231f MP |
145 | /* ESSIV: struct crypto_cipher *essiv_tfm */ |
146 | void *iv_private; | |
147 | struct crypto_ablkcipher **tfms; | |
d1f96423 | 148 | unsigned tfms_count; |
c0297721 | 149 | |
ddd42edf MB |
150 | /* |
151 | * Layout of each crypto request: | |
152 | * | |
153 | * struct ablkcipher_request | |
154 | * context | |
155 | * padding | |
156 | * struct dm_crypt_request | |
157 | * padding | |
158 | * IV | |
159 | * | |
160 | * The padding is added so that dm_crypt_request and the IV are | |
161 | * correctly aligned. | |
162 | */ | |
163 | unsigned int dmreq_start; | |
ddd42edf | 164 | |
e48d4bbf | 165 | unsigned long flags; |
1da177e4 | 166 | unsigned int key_size; |
da31a078 MB |
167 | unsigned int key_parts; /* independent parts in key buffer */ |
168 | unsigned int key_extra_size; /* additional keys length */ | |
1da177e4 LT |
169 | u8 key[0]; |
170 | }; | |
171 | ||
6a24c718 | 172 | #define MIN_IOS 16 |
1da177e4 | 173 | #define MIN_POOL_PAGES 32 |
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; | |
527 | struct { | |
528 | struct shash_desc desc; | |
529 | char ctx[crypto_shash_descsize(lmk->hash_tfm)]; | |
530 | } sdesc; | |
531 | struct md5_state md5state; | |
da31a078 | 532 | __le32 buf[4]; |
34745785 MB |
533 | int i, r; |
534 | ||
535 | sdesc.desc.tfm = lmk->hash_tfm; | |
536 | sdesc.desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
537 | ||
538 | r = crypto_shash_init(&sdesc.desc); | |
539 | if (r) | |
540 | return r; | |
541 | ||
542 | if (lmk->seed) { | |
543 | r = crypto_shash_update(&sdesc.desc, lmk->seed, LMK_SEED_SIZE); | |
544 | if (r) | |
545 | return r; | |
546 | } | |
547 | ||
548 | /* Sector is always 512B, block size 16, add data of blocks 1-31 */ | |
549 | r = crypto_shash_update(&sdesc.desc, data + 16, 16 * 31); | |
550 | if (r) | |
551 | return r; | |
552 | ||
553 | /* Sector is cropped to 56 bits here */ | |
554 | buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); | |
555 | buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); | |
556 | buf[2] = cpu_to_le32(4024); | |
557 | buf[3] = 0; | |
558 | r = crypto_shash_update(&sdesc.desc, (u8 *)buf, sizeof(buf)); | |
559 | if (r) | |
560 | return r; | |
561 | ||
562 | /* No MD5 padding here */ | |
563 | r = crypto_shash_export(&sdesc.desc, &md5state); | |
564 | if (r) | |
565 | return r; | |
566 | ||
567 | for (i = 0; i < MD5_HASH_WORDS; i++) | |
568 | __cpu_to_le32s(&md5state.hash[i]); | |
569 | memcpy(iv, &md5state.hash, cc->iv_size); | |
570 | ||
571 | return 0; | |
572 | } | |
573 | ||
574 | static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, | |
575 | struct dm_crypt_request *dmreq) | |
576 | { | |
577 | u8 *src; | |
578 | int r = 0; | |
579 | ||
580 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { | |
c2e022cb | 581 | src = kmap_atomic(sg_page(&dmreq->sg_in)); |
34745785 | 582 | r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset); |
c2e022cb | 583 | kunmap_atomic(src); |
34745785 MB |
584 | } else |
585 | memset(iv, 0, cc->iv_size); | |
586 | ||
587 | return r; | |
588 | } | |
589 | ||
590 | static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, | |
591 | struct dm_crypt_request *dmreq) | |
592 | { | |
593 | u8 *dst; | |
594 | int r; | |
595 | ||
596 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) | |
597 | return 0; | |
598 | ||
c2e022cb | 599 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); |
34745785 MB |
600 | r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset); |
601 | ||
602 | /* Tweak the first block of plaintext sector */ | |
603 | if (!r) | |
604 | crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size); | |
605 | ||
c2e022cb | 606 | kunmap_atomic(dst); |
34745785 MB |
607 | return r; |
608 | } | |
609 | ||
ed04d981 MB |
610 | static void crypt_iv_tcw_dtr(struct crypt_config *cc) |
611 | { | |
612 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
613 | ||
614 | kzfree(tcw->iv_seed); | |
615 | tcw->iv_seed = NULL; | |
616 | kzfree(tcw->whitening); | |
617 | tcw->whitening = NULL; | |
618 | ||
619 | if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm)) | |
620 | crypto_free_shash(tcw->crc32_tfm); | |
621 | tcw->crc32_tfm = NULL; | |
622 | } | |
623 | ||
624 | static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti, | |
625 | const char *opts) | |
626 | { | |
627 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
628 | ||
629 | if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) { | |
630 | ti->error = "Wrong key size for TCW"; | |
631 | return -EINVAL; | |
632 | } | |
633 | ||
634 | tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0); | |
635 | if (IS_ERR(tcw->crc32_tfm)) { | |
636 | ti->error = "Error initializing CRC32 in TCW"; | |
637 | return PTR_ERR(tcw->crc32_tfm); | |
638 | } | |
639 | ||
640 | tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL); | |
641 | tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL); | |
642 | if (!tcw->iv_seed || !tcw->whitening) { | |
643 | crypt_iv_tcw_dtr(cc); | |
644 | ti->error = "Error allocating seed storage in TCW"; | |
645 | return -ENOMEM; | |
646 | } | |
647 | ||
648 | return 0; | |
649 | } | |
650 | ||
651 | static int crypt_iv_tcw_init(struct crypt_config *cc) | |
652 | { | |
653 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
654 | int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE; | |
655 | ||
656 | memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size); | |
657 | memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size], | |
658 | TCW_WHITENING_SIZE); | |
659 | ||
660 | return 0; | |
661 | } | |
662 | ||
663 | static int crypt_iv_tcw_wipe(struct crypt_config *cc) | |
664 | { | |
665 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
666 | ||
667 | memset(tcw->iv_seed, 0, cc->iv_size); | |
668 | memset(tcw->whitening, 0, TCW_WHITENING_SIZE); | |
669 | ||
670 | return 0; | |
671 | } | |
672 | ||
673 | static int crypt_iv_tcw_whitening(struct crypt_config *cc, | |
674 | struct dm_crypt_request *dmreq, | |
675 | u8 *data) | |
676 | { | |
677 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
678 | u64 sector = cpu_to_le64((u64)dmreq->iv_sector); | |
679 | u8 buf[TCW_WHITENING_SIZE]; | |
680 | struct { | |
681 | struct shash_desc desc; | |
682 | char ctx[crypto_shash_descsize(tcw->crc32_tfm)]; | |
683 | } sdesc; | |
684 | int i, r; | |
685 | ||
686 | /* xor whitening with sector number */ | |
687 | memcpy(buf, tcw->whitening, TCW_WHITENING_SIZE); | |
688 | crypto_xor(buf, (u8 *)§or, 8); | |
689 | crypto_xor(&buf[8], (u8 *)§or, 8); | |
690 | ||
691 | /* calculate crc32 for every 32bit part and xor it */ | |
692 | sdesc.desc.tfm = tcw->crc32_tfm; | |
693 | sdesc.desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
694 | for (i = 0; i < 4; i++) { | |
695 | r = crypto_shash_init(&sdesc.desc); | |
696 | if (r) | |
697 | goto out; | |
698 | r = crypto_shash_update(&sdesc.desc, &buf[i * 4], 4); | |
699 | if (r) | |
700 | goto out; | |
701 | r = crypto_shash_final(&sdesc.desc, &buf[i * 4]); | |
702 | if (r) | |
703 | goto out; | |
704 | } | |
705 | crypto_xor(&buf[0], &buf[12], 4); | |
706 | crypto_xor(&buf[4], &buf[8], 4); | |
707 | ||
708 | /* apply whitening (8 bytes) to whole sector */ | |
709 | for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++) | |
710 | crypto_xor(data + i * 8, buf, 8); | |
711 | out: | |
712 | memset(buf, 0, sizeof(buf)); | |
713 | return r; | |
714 | } | |
715 | ||
716 | static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, | |
717 | struct dm_crypt_request *dmreq) | |
718 | { | |
719 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
720 | u64 sector = cpu_to_le64((u64)dmreq->iv_sector); | |
721 | u8 *src; | |
722 | int r = 0; | |
723 | ||
724 | /* Remove whitening from ciphertext */ | |
725 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { | |
726 | src = kmap_atomic(sg_page(&dmreq->sg_in)); | |
727 | r = crypt_iv_tcw_whitening(cc, dmreq, src + dmreq->sg_in.offset); | |
728 | kunmap_atomic(src); | |
729 | } | |
730 | ||
731 | /* Calculate IV */ | |
732 | memcpy(iv, tcw->iv_seed, cc->iv_size); | |
733 | crypto_xor(iv, (u8 *)§or, 8); | |
734 | if (cc->iv_size > 8) | |
735 | crypto_xor(&iv[8], (u8 *)§or, cc->iv_size - 8); | |
736 | ||
737 | return r; | |
738 | } | |
739 | ||
740 | static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, | |
741 | struct dm_crypt_request *dmreq) | |
742 | { | |
743 | u8 *dst; | |
744 | int r; | |
745 | ||
746 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) | |
747 | return 0; | |
748 | ||
749 | /* Apply whitening on ciphertext */ | |
750 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); | |
751 | r = crypt_iv_tcw_whitening(cc, dmreq, dst + dmreq->sg_out.offset); | |
752 | kunmap_atomic(dst); | |
753 | ||
754 | return r; | |
755 | } | |
756 | ||
1da177e4 LT |
757 | static struct crypt_iv_operations crypt_iv_plain_ops = { |
758 | .generator = crypt_iv_plain_gen | |
759 | }; | |
760 | ||
61afef61 MB |
761 | static struct crypt_iv_operations crypt_iv_plain64_ops = { |
762 | .generator = crypt_iv_plain64_gen | |
763 | }; | |
764 | ||
1da177e4 LT |
765 | static struct crypt_iv_operations crypt_iv_essiv_ops = { |
766 | .ctr = crypt_iv_essiv_ctr, | |
767 | .dtr = crypt_iv_essiv_dtr, | |
b95bf2d3 | 768 | .init = crypt_iv_essiv_init, |
542da317 | 769 | .wipe = crypt_iv_essiv_wipe, |
1da177e4 LT |
770 | .generator = crypt_iv_essiv_gen |
771 | }; | |
772 | ||
48527fa7 RS |
773 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
774 | .ctr = crypt_iv_benbi_ctr, | |
775 | .dtr = crypt_iv_benbi_dtr, | |
776 | .generator = crypt_iv_benbi_gen | |
777 | }; | |
1da177e4 | 778 | |
46b47730 LN |
779 | static struct crypt_iv_operations crypt_iv_null_ops = { |
780 | .generator = crypt_iv_null_gen | |
781 | }; | |
782 | ||
34745785 MB |
783 | static struct crypt_iv_operations crypt_iv_lmk_ops = { |
784 | .ctr = crypt_iv_lmk_ctr, | |
785 | .dtr = crypt_iv_lmk_dtr, | |
786 | .init = crypt_iv_lmk_init, | |
787 | .wipe = crypt_iv_lmk_wipe, | |
788 | .generator = crypt_iv_lmk_gen, | |
789 | .post = crypt_iv_lmk_post | |
790 | }; | |
791 | ||
ed04d981 MB |
792 | static struct crypt_iv_operations crypt_iv_tcw_ops = { |
793 | .ctr = crypt_iv_tcw_ctr, | |
794 | .dtr = crypt_iv_tcw_dtr, | |
795 | .init = crypt_iv_tcw_init, | |
796 | .wipe = crypt_iv_tcw_wipe, | |
797 | .generator = crypt_iv_tcw_gen, | |
798 | .post = crypt_iv_tcw_post | |
799 | }; | |
800 | ||
d469f841 MB |
801 | static void crypt_convert_init(struct crypt_config *cc, |
802 | struct convert_context *ctx, | |
803 | struct bio *bio_out, struct bio *bio_in, | |
fcd369da | 804 | sector_t sector) |
1da177e4 LT |
805 | { |
806 | ctx->bio_in = bio_in; | |
807 | ctx->bio_out = bio_out; | |
003b5c57 KO |
808 | if (bio_in) |
809 | ctx->iter_in = bio_in->bi_iter; | |
810 | if (bio_out) | |
811 | ctx->iter_out = bio_out->bi_iter; | |
c66029f4 | 812 | ctx->cc_sector = sector + cc->iv_offset; |
43d69034 | 813 | init_completion(&ctx->restart); |
1da177e4 LT |
814 | } |
815 | ||
b2174eeb HY |
816 | static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, |
817 | struct ablkcipher_request *req) | |
818 | { | |
819 | return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); | |
820 | } | |
821 | ||
822 | static struct ablkcipher_request *req_of_dmreq(struct crypt_config *cc, | |
823 | struct dm_crypt_request *dmreq) | |
824 | { | |
825 | return (struct ablkcipher_request *)((char *)dmreq - cc->dmreq_start); | |
826 | } | |
827 | ||
2dc5327d MB |
828 | static u8 *iv_of_dmreq(struct crypt_config *cc, |
829 | struct dm_crypt_request *dmreq) | |
830 | { | |
831 | return (u8 *)ALIGN((unsigned long)(dmreq + 1), | |
832 | crypto_ablkcipher_alignmask(any_tfm(cc)) + 1); | |
833 | } | |
834 | ||
01482b76 | 835 | static int crypt_convert_block(struct crypt_config *cc, |
3a7f6c99 MB |
836 | struct convert_context *ctx, |
837 | struct ablkcipher_request *req) | |
01482b76 | 838 | { |
003b5c57 KO |
839 | struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); |
840 | struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); | |
3a7f6c99 MB |
841 | struct dm_crypt_request *dmreq; |
842 | u8 *iv; | |
40b6229b | 843 | int r; |
3a7f6c99 | 844 | |
b2174eeb | 845 | dmreq = dmreq_of_req(cc, req); |
2dc5327d | 846 | iv = iv_of_dmreq(cc, dmreq); |
01482b76 | 847 | |
c66029f4 | 848 | dmreq->iv_sector = ctx->cc_sector; |
b2174eeb | 849 | dmreq->ctx = ctx; |
3a7f6c99 | 850 | sg_init_table(&dmreq->sg_in, 1); |
003b5c57 KO |
851 | sg_set_page(&dmreq->sg_in, bv_in.bv_page, 1 << SECTOR_SHIFT, |
852 | bv_in.bv_offset); | |
01482b76 | 853 | |
3a7f6c99 | 854 | sg_init_table(&dmreq->sg_out, 1); |
003b5c57 KO |
855 | sg_set_page(&dmreq->sg_out, bv_out.bv_page, 1 << SECTOR_SHIFT, |
856 | bv_out.bv_offset); | |
01482b76 | 857 | |
003b5c57 KO |
858 | bio_advance_iter(ctx->bio_in, &ctx->iter_in, 1 << SECTOR_SHIFT); |
859 | bio_advance_iter(ctx->bio_out, &ctx->iter_out, 1 << SECTOR_SHIFT); | |
01482b76 | 860 | |
3a7f6c99 | 861 | if (cc->iv_gen_ops) { |
2dc5327d | 862 | r = cc->iv_gen_ops->generator(cc, iv, dmreq); |
3a7f6c99 MB |
863 | if (r < 0) |
864 | return r; | |
865 | } | |
866 | ||
867 | ablkcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out, | |
868 | 1 << SECTOR_SHIFT, iv); | |
869 | ||
870 | if (bio_data_dir(ctx->bio_in) == WRITE) | |
871 | r = crypto_ablkcipher_encrypt(req); | |
872 | else | |
873 | r = crypto_ablkcipher_decrypt(req); | |
874 | ||
2dc5327d MB |
875 | if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) |
876 | r = cc->iv_gen_ops->post(cc, iv, dmreq); | |
877 | ||
3a7f6c99 | 878 | return r; |
01482b76 MB |
879 | } |
880 | ||
95497a96 MB |
881 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
882 | int error); | |
c0297721 | 883 | |
ddd42edf MB |
884 | static void crypt_alloc_req(struct crypt_config *cc, |
885 | struct convert_context *ctx) | |
886 | { | |
c66029f4 | 887 | unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1); |
c0297721 | 888 | |
610f2de3 MP |
889 | if (!ctx->req) |
890 | ctx->req = mempool_alloc(cc->req_pool, GFP_NOIO); | |
c0297721 | 891 | |
610f2de3 MP |
892 | ablkcipher_request_set_tfm(ctx->req, cc->tfms[key_index]); |
893 | ablkcipher_request_set_callback(ctx->req, | |
c0297721 | 894 | CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, |
610f2de3 | 895 | kcryptd_async_done, dmreq_of_req(cc, ctx->req)); |
ddd42edf MB |
896 | } |
897 | ||
1da177e4 LT |
898 | /* |
899 | * Encrypt / decrypt data from one bio to another one (can be the same one) | |
900 | */ | |
901 | static int crypt_convert(struct crypt_config *cc, | |
d469f841 | 902 | struct convert_context *ctx) |
1da177e4 | 903 | { |
3f1e9070 | 904 | int r; |
1da177e4 | 905 | |
40b6229b | 906 | atomic_set(&ctx->cc_pending, 1); |
c8081618 | 907 | |
003b5c57 | 908 | while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) { |
1da177e4 | 909 | |
3a7f6c99 MB |
910 | crypt_alloc_req(cc, ctx); |
911 | ||
40b6229b | 912 | atomic_inc(&ctx->cc_pending); |
3f1e9070 | 913 | |
610f2de3 | 914 | r = crypt_convert_block(cc, ctx, ctx->req); |
3a7f6c99 MB |
915 | |
916 | switch (r) { | |
3f1e9070 | 917 | /* async */ |
3a7f6c99 MB |
918 | case -EBUSY: |
919 | wait_for_completion(&ctx->restart); | |
16735d02 | 920 | reinit_completion(&ctx->restart); |
3a7f6c99 MB |
921 | /* fall through*/ |
922 | case -EINPROGRESS: | |
610f2de3 | 923 | ctx->req = NULL; |
c66029f4 | 924 | ctx->cc_sector++; |
3f1e9070 MB |
925 | continue; |
926 | ||
927 | /* sync */ | |
3a7f6c99 | 928 | case 0: |
40b6229b | 929 | atomic_dec(&ctx->cc_pending); |
c66029f4 | 930 | ctx->cc_sector++; |
c7f1b204 | 931 | cond_resched(); |
3a7f6c99 | 932 | continue; |
3a7f6c99 | 933 | |
3f1e9070 MB |
934 | /* error */ |
935 | default: | |
40b6229b | 936 | atomic_dec(&ctx->cc_pending); |
3f1e9070 MB |
937 | return r; |
938 | } | |
1da177e4 LT |
939 | } |
940 | ||
3f1e9070 | 941 | return 0; |
1da177e4 LT |
942 | } |
943 | ||
944 | /* | |
945 | * Generate a new unfragmented bio with the given size | |
946 | * This should never violate the device limitations | |
933f01d4 MB |
947 | * May return a smaller bio when running out of pages, indicated by |
948 | * *out_of_pages set to 1. | |
1da177e4 | 949 | */ |
933f01d4 MB |
950 | static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size, |
951 | unsigned *out_of_pages) | |
1da177e4 | 952 | { |
49a8a920 | 953 | struct crypt_config *cc = io->cc; |
8b004457 | 954 | struct bio *clone; |
1da177e4 | 955 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
b4e3ca1a | 956 | gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM; |
91e10625 MB |
957 | unsigned i, len; |
958 | struct page *page; | |
1da177e4 | 959 | |
2f9941b6 | 960 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
8b004457 | 961 | if (!clone) |
1da177e4 | 962 | return NULL; |
1da177e4 | 963 | |
027581f3 | 964 | clone_init(io, clone); |
933f01d4 | 965 | *out_of_pages = 0; |
6a24c718 | 966 | |
f97380bc | 967 | for (i = 0; i < nr_iovecs; i++) { |
91e10625 | 968 | page = mempool_alloc(cc->page_pool, gfp_mask); |
933f01d4 MB |
969 | if (!page) { |
970 | *out_of_pages = 1; | |
1da177e4 | 971 | break; |
933f01d4 | 972 | } |
1da177e4 LT |
973 | |
974 | /* | |
aeb2deae MP |
975 | * If additional pages cannot be allocated without waiting, |
976 | * return a partially-allocated bio. The caller will then try | |
977 | * to allocate more bios while submitting this partial bio. | |
1da177e4 | 978 | */ |
aeb2deae | 979 | gfp_mask = (gfp_mask | __GFP_NOWARN) & ~__GFP_WAIT; |
1da177e4 | 980 | |
91e10625 MB |
981 | len = (size > PAGE_SIZE) ? PAGE_SIZE : size; |
982 | ||
983 | if (!bio_add_page(clone, page, len, 0)) { | |
984 | mempool_free(page, cc->page_pool); | |
985 | break; | |
986 | } | |
1da177e4 | 987 | |
91e10625 | 988 | size -= len; |
1da177e4 LT |
989 | } |
990 | ||
4f024f37 | 991 | if (!clone->bi_iter.bi_size) { |
8b004457 | 992 | bio_put(clone); |
1da177e4 LT |
993 | return NULL; |
994 | } | |
995 | ||
8b004457 | 996 | return clone; |
1da177e4 LT |
997 | } |
998 | ||
644bd2f0 | 999 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) |
1da177e4 | 1000 | { |
644bd2f0 | 1001 | unsigned int i; |
1da177e4 LT |
1002 | struct bio_vec *bv; |
1003 | ||
cb34e057 | 1004 | bio_for_each_segment_all(bv, clone, i) { |
1da177e4 LT |
1005 | BUG_ON(!bv->bv_page); |
1006 | mempool_free(bv->bv_page, cc->page_pool); | |
1007 | bv->bv_page = NULL; | |
1008 | } | |
1009 | } | |
1010 | ||
49a8a920 | 1011 | static struct dm_crypt_io *crypt_io_alloc(struct crypt_config *cc, |
dc440d1e MB |
1012 | struct bio *bio, sector_t sector) |
1013 | { | |
dc440d1e MB |
1014 | struct dm_crypt_io *io; |
1015 | ||
1016 | io = mempool_alloc(cc->io_pool, GFP_NOIO); | |
49a8a920 | 1017 | io->cc = cc; |
dc440d1e MB |
1018 | io->base_bio = bio; |
1019 | io->sector = sector; | |
1020 | io->error = 0; | |
393b47ef | 1021 | io->base_io = NULL; |
610f2de3 | 1022 | io->ctx.req = NULL; |
40b6229b | 1023 | atomic_set(&io->io_pending, 0); |
dc440d1e MB |
1024 | |
1025 | return io; | |
1026 | } | |
1027 | ||
3e1a8bdd MB |
1028 | static void crypt_inc_pending(struct dm_crypt_io *io) |
1029 | { | |
40b6229b | 1030 | atomic_inc(&io->io_pending); |
3e1a8bdd MB |
1031 | } |
1032 | ||
1da177e4 LT |
1033 | /* |
1034 | * One of the bios was finished. Check for completion of | |
1035 | * the whole request and correctly clean up the buffer. | |
393b47ef | 1036 | * If base_io is set, wait for the last fragment to complete. |
1da177e4 | 1037 | */ |
5742fd77 | 1038 | static void crypt_dec_pending(struct dm_crypt_io *io) |
1da177e4 | 1039 | { |
49a8a920 | 1040 | struct crypt_config *cc = io->cc; |
b35f8caa MB |
1041 | struct bio *base_bio = io->base_bio; |
1042 | struct dm_crypt_io *base_io = io->base_io; | |
1043 | int error = io->error; | |
1da177e4 | 1044 | |
40b6229b | 1045 | if (!atomic_dec_and_test(&io->io_pending)) |
1da177e4 LT |
1046 | return; |
1047 | ||
610f2de3 MP |
1048 | if (io->ctx.req) |
1049 | mempool_free(io->ctx.req, cc->req_pool); | |
b35f8caa MB |
1050 | mempool_free(io, cc->io_pool); |
1051 | ||
1052 | if (likely(!base_io)) | |
1053 | bio_endio(base_bio, error); | |
393b47ef | 1054 | else { |
b35f8caa MB |
1055 | if (error && !base_io->error) |
1056 | base_io->error = error; | |
1057 | crypt_dec_pending(base_io); | |
393b47ef | 1058 | } |
1da177e4 LT |
1059 | } |
1060 | ||
1061 | /* | |
cabf08e4 | 1062 | * kcryptd/kcryptd_io: |
1da177e4 LT |
1063 | * |
1064 | * Needed because it would be very unwise to do decryption in an | |
23541d2d | 1065 | * interrupt context. |
cabf08e4 MB |
1066 | * |
1067 | * kcryptd performs the actual encryption or decryption. | |
1068 | * | |
1069 | * kcryptd_io performs the IO submission. | |
1070 | * | |
1071 | * They must be separated as otherwise the final stages could be | |
1072 | * starved by new requests which can block in the first stages due | |
1073 | * to memory allocation. | |
c0297721 AK |
1074 | * |
1075 | * The work is done per CPU global for all dm-crypt instances. | |
1076 | * They should not depend on each other and do not block. | |
1da177e4 | 1077 | */ |
6712ecf8 | 1078 | static void crypt_endio(struct bio *clone, int error) |
8b004457 | 1079 | { |
028867ac | 1080 | struct dm_crypt_io *io = clone->bi_private; |
49a8a920 | 1081 | struct crypt_config *cc = io->cc; |
ee7a491e | 1082 | unsigned rw = bio_data_dir(clone); |
8b004457 | 1083 | |
adfe4770 MB |
1084 | if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error)) |
1085 | error = -EIO; | |
1086 | ||
8b004457 | 1087 | /* |
6712ecf8 | 1088 | * free the processed pages |
8b004457 | 1089 | */ |
ee7a491e | 1090 | if (rw == WRITE) |
644bd2f0 | 1091 | crypt_free_buffer_pages(cc, clone); |
8b004457 MB |
1092 | |
1093 | bio_put(clone); | |
8b004457 | 1094 | |
ee7a491e MB |
1095 | if (rw == READ && !error) { |
1096 | kcryptd_queue_crypt(io); | |
1097 | return; | |
1098 | } | |
5742fd77 MB |
1099 | |
1100 | if (unlikely(error)) | |
1101 | io->error = error; | |
1102 | ||
1103 | crypt_dec_pending(io); | |
8b004457 MB |
1104 | } |
1105 | ||
028867ac | 1106 | static void clone_init(struct dm_crypt_io *io, struct bio *clone) |
8b004457 | 1107 | { |
49a8a920 | 1108 | struct crypt_config *cc = io->cc; |
8b004457 MB |
1109 | |
1110 | clone->bi_private = io; | |
1111 | clone->bi_end_io = crypt_endio; | |
1112 | clone->bi_bdev = cc->dev->bdev; | |
1113 | clone->bi_rw = io->base_bio->bi_rw; | |
1114 | } | |
1115 | ||
20c82538 | 1116 | static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) |
8b004457 | 1117 | { |
49a8a920 | 1118 | struct crypt_config *cc = io->cc; |
8b004457 MB |
1119 | struct bio *base_bio = io->base_bio; |
1120 | struct bio *clone; | |
93e605c2 | 1121 | |
8b004457 MB |
1122 | /* |
1123 | * The block layer might modify the bvec array, so always | |
1124 | * copy the required bvecs because we need the original | |
1125 | * one in order to decrypt the whole bio data *afterwards*. | |
1126 | */ | |
bf800ef1 | 1127 | clone = bio_clone_bioset(base_bio, gfp, cc->bs); |
7eaceacc | 1128 | if (!clone) |
20c82538 | 1129 | return 1; |
8b004457 | 1130 | |
20c82538 MB |
1131 | crypt_inc_pending(io); |
1132 | ||
8b004457 | 1133 | clone_init(io, clone); |
4f024f37 | 1134 | clone->bi_iter.bi_sector = cc->start + io->sector; |
8b004457 | 1135 | |
93e605c2 | 1136 | generic_make_request(clone); |
20c82538 | 1137 | return 0; |
8b004457 MB |
1138 | } |
1139 | ||
4e4eef64 MB |
1140 | static void kcryptd_io_write(struct dm_crypt_io *io) |
1141 | { | |
95497a96 | 1142 | struct bio *clone = io->ctx.bio_out; |
95497a96 | 1143 | generic_make_request(clone); |
4e4eef64 MB |
1144 | } |
1145 | ||
395b167c AK |
1146 | static void kcryptd_io(struct work_struct *work) |
1147 | { | |
1148 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); | |
1149 | ||
20c82538 MB |
1150 | if (bio_data_dir(io->base_bio) == READ) { |
1151 | crypt_inc_pending(io); | |
1152 | if (kcryptd_io_read(io, GFP_NOIO)) | |
1153 | io->error = -ENOMEM; | |
1154 | crypt_dec_pending(io); | |
1155 | } else | |
395b167c AK |
1156 | kcryptd_io_write(io); |
1157 | } | |
1158 | ||
1159 | static void kcryptd_queue_io(struct dm_crypt_io *io) | |
1160 | { | |
49a8a920 | 1161 | struct crypt_config *cc = io->cc; |
395b167c AK |
1162 | |
1163 | INIT_WORK(&io->work, kcryptd_io); | |
1164 | queue_work(cc->io_queue, &io->work); | |
1165 | } | |
1166 | ||
72c6e7af | 1167 | static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) |
4e4eef64 | 1168 | { |
dec1cedf | 1169 | struct bio *clone = io->ctx.bio_out; |
49a8a920 | 1170 | struct crypt_config *cc = io->cc; |
dec1cedf | 1171 | |
72c6e7af | 1172 | if (unlikely(io->error < 0)) { |
dec1cedf MB |
1173 | crypt_free_buffer_pages(cc, clone); |
1174 | bio_put(clone); | |
6c031f41 | 1175 | crypt_dec_pending(io); |
dec1cedf MB |
1176 | return; |
1177 | } | |
1178 | ||
1179 | /* crypt_convert should have filled the clone bio */ | |
003b5c57 | 1180 | BUG_ON(io->ctx.iter_out.bi_size); |
dec1cedf | 1181 | |
4f024f37 | 1182 | clone->bi_iter.bi_sector = cc->start + io->sector; |
899c95d3 | 1183 | |
95497a96 MB |
1184 | if (async) |
1185 | kcryptd_queue_io(io); | |
1e37bb8e | 1186 | else |
95497a96 | 1187 | generic_make_request(clone); |
4e4eef64 MB |
1188 | } |
1189 | ||
fc5a5e9a | 1190 | static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) |
8b004457 | 1191 | { |
49a8a920 | 1192 | struct crypt_config *cc = io->cc; |
8b004457 | 1193 | struct bio *clone; |
393b47ef | 1194 | struct dm_crypt_io *new_io; |
c8081618 | 1195 | int crypt_finished; |
933f01d4 | 1196 | unsigned out_of_pages = 0; |
4f024f37 | 1197 | unsigned remaining = io->base_bio->bi_iter.bi_size; |
b635b00e | 1198 | sector_t sector = io->sector; |
dec1cedf | 1199 | int r; |
8b004457 | 1200 | |
fc5a5e9a MB |
1201 | /* |
1202 | * Prevent io from disappearing until this function completes. | |
1203 | */ | |
1204 | crypt_inc_pending(io); | |
b635b00e | 1205 | crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); |
fc5a5e9a | 1206 | |
93e605c2 MB |
1207 | /* |
1208 | * The allocated buffers can be smaller than the whole bio, | |
1209 | * so repeat the whole process until all the data can be handled. | |
1210 | */ | |
1211 | while (remaining) { | |
933f01d4 | 1212 | clone = crypt_alloc_buffer(io, remaining, &out_of_pages); |
23541d2d | 1213 | if (unlikely(!clone)) { |
5742fd77 | 1214 | io->error = -ENOMEM; |
fc5a5e9a | 1215 | break; |
23541d2d | 1216 | } |
93e605c2 | 1217 | |
53017030 | 1218 | io->ctx.bio_out = clone; |
003b5c57 | 1219 | io->ctx.iter_out = clone->bi_iter; |
93e605c2 | 1220 | |
4f024f37 | 1221 | remaining -= clone->bi_iter.bi_size; |
b635b00e | 1222 | sector += bio_sectors(clone); |
93e605c2 | 1223 | |
4e594098 | 1224 | crypt_inc_pending(io); |
72c6e7af | 1225 | |
dec1cedf | 1226 | r = crypt_convert(cc, &io->ctx); |
72c6e7af MP |
1227 | if (r < 0) |
1228 | io->error = -EIO; | |
1229 | ||
40b6229b | 1230 | crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending); |
f97380bc | 1231 | |
c8081618 MB |
1232 | /* Encryption was already finished, submit io now */ |
1233 | if (crypt_finished) { | |
72c6e7af | 1234 | kcryptd_crypt_write_io_submit(io, 0); |
c8081618 MB |
1235 | |
1236 | /* | |
1237 | * If there was an error, do not try next fragments. | |
1238 | * For async, error is processed in async handler. | |
1239 | */ | |
6c031f41 | 1240 | if (unlikely(r < 0)) |
fc5a5e9a | 1241 | break; |
b635b00e MB |
1242 | |
1243 | io->sector = sector; | |
4e594098 | 1244 | } |
93e605c2 | 1245 | |
933f01d4 MB |
1246 | /* |
1247 | * Out of memory -> run queues | |
1248 | * But don't wait if split was due to the io size restriction | |
1249 | */ | |
1250 | if (unlikely(out_of_pages)) | |
8aa7e847 | 1251 | congestion_wait(BLK_RW_ASYNC, HZ/100); |
933f01d4 | 1252 | |
393b47ef MB |
1253 | /* |
1254 | * With async crypto it is unsafe to share the crypto context | |
1255 | * between fragments, so switch to a new dm_crypt_io structure. | |
1256 | */ | |
1257 | if (unlikely(!crypt_finished && remaining)) { | |
49a8a920 | 1258 | new_io = crypt_io_alloc(io->cc, io->base_bio, |
393b47ef MB |
1259 | sector); |
1260 | crypt_inc_pending(new_io); | |
1261 | crypt_convert_init(cc, &new_io->ctx, NULL, | |
1262 | io->base_bio, sector); | |
003b5c57 | 1263 | new_io->ctx.iter_in = io->ctx.iter_in; |
393b47ef MB |
1264 | |
1265 | /* | |
1266 | * Fragments after the first use the base_io | |
1267 | * pending count. | |
1268 | */ | |
1269 | if (!io->base_io) | |
1270 | new_io->base_io = io; | |
1271 | else { | |
1272 | new_io->base_io = io->base_io; | |
1273 | crypt_inc_pending(io->base_io); | |
1274 | crypt_dec_pending(io); | |
1275 | } | |
1276 | ||
1277 | io = new_io; | |
1278 | } | |
93e605c2 | 1279 | } |
899c95d3 MB |
1280 | |
1281 | crypt_dec_pending(io); | |
84131db6 MB |
1282 | } |
1283 | ||
72c6e7af | 1284 | static void kcryptd_crypt_read_done(struct dm_crypt_io *io) |
5742fd77 | 1285 | { |
5742fd77 MB |
1286 | crypt_dec_pending(io); |
1287 | } | |
1288 | ||
4e4eef64 | 1289 | static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) |
8b004457 | 1290 | { |
49a8a920 | 1291 | struct crypt_config *cc = io->cc; |
5742fd77 | 1292 | int r = 0; |
1da177e4 | 1293 | |
3e1a8bdd | 1294 | crypt_inc_pending(io); |
3a7f6c99 | 1295 | |
53017030 | 1296 | crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, |
0c395b0f | 1297 | io->sector); |
1da177e4 | 1298 | |
5742fd77 | 1299 | r = crypt_convert(cc, &io->ctx); |
72c6e7af MP |
1300 | if (r < 0) |
1301 | io->error = -EIO; | |
5742fd77 | 1302 | |
40b6229b | 1303 | if (atomic_dec_and_test(&io->ctx.cc_pending)) |
72c6e7af | 1304 | kcryptd_crypt_read_done(io); |
3a7f6c99 MB |
1305 | |
1306 | crypt_dec_pending(io); | |
1da177e4 LT |
1307 | } |
1308 | ||
95497a96 MB |
1309 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
1310 | int error) | |
1311 | { | |
b2174eeb HY |
1312 | struct dm_crypt_request *dmreq = async_req->data; |
1313 | struct convert_context *ctx = dmreq->ctx; | |
95497a96 | 1314 | struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); |
49a8a920 | 1315 | struct crypt_config *cc = io->cc; |
95497a96 MB |
1316 | |
1317 | if (error == -EINPROGRESS) { | |
1318 | complete(&ctx->restart); | |
1319 | return; | |
1320 | } | |
1321 | ||
2dc5327d MB |
1322 | if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) |
1323 | error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq); | |
1324 | ||
72c6e7af MP |
1325 | if (error < 0) |
1326 | io->error = -EIO; | |
1327 | ||
b2174eeb | 1328 | mempool_free(req_of_dmreq(cc, dmreq), cc->req_pool); |
95497a96 | 1329 | |
40b6229b | 1330 | if (!atomic_dec_and_test(&ctx->cc_pending)) |
95497a96 MB |
1331 | return; |
1332 | ||
1333 | if (bio_data_dir(io->base_bio) == READ) | |
72c6e7af | 1334 | kcryptd_crypt_read_done(io); |
95497a96 | 1335 | else |
72c6e7af | 1336 | kcryptd_crypt_write_io_submit(io, 1); |
95497a96 MB |
1337 | } |
1338 | ||
395b167c | 1339 | static void kcryptd_crypt(struct work_struct *work) |
1da177e4 | 1340 | { |
028867ac | 1341 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
8b004457 | 1342 | |
cabf08e4 | 1343 | if (bio_data_dir(io->base_bio) == READ) |
395b167c | 1344 | kcryptd_crypt_read_convert(io); |
4e4eef64 | 1345 | else |
395b167c | 1346 | kcryptd_crypt_write_convert(io); |
cabf08e4 MB |
1347 | } |
1348 | ||
395b167c | 1349 | static void kcryptd_queue_crypt(struct dm_crypt_io *io) |
cabf08e4 | 1350 | { |
49a8a920 | 1351 | struct crypt_config *cc = io->cc; |
cabf08e4 | 1352 | |
395b167c AK |
1353 | INIT_WORK(&io->work, kcryptd_crypt); |
1354 | queue_work(cc->crypt_queue, &io->work); | |
1da177e4 LT |
1355 | } |
1356 | ||
1357 | /* | |
1358 | * Decode key from its hex representation | |
1359 | */ | |
1360 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) | |
1361 | { | |
1362 | char buffer[3]; | |
1da177e4 LT |
1363 | unsigned int i; |
1364 | ||
1365 | buffer[2] = '\0'; | |
1366 | ||
8b004457 | 1367 | for (i = 0; i < size; i++) { |
1da177e4 LT |
1368 | buffer[0] = *hex++; |
1369 | buffer[1] = *hex++; | |
1370 | ||
1a66a08a | 1371 | if (kstrtou8(buffer, 16, &key[i])) |
1da177e4 LT |
1372 | return -EINVAL; |
1373 | } | |
1374 | ||
1375 | if (*hex != '\0') | |
1376 | return -EINVAL; | |
1377 | ||
1378 | return 0; | |
1379 | } | |
1380 | ||
fd2d231f | 1381 | static void crypt_free_tfms(struct crypt_config *cc) |
d1f96423 | 1382 | { |
d1f96423 MB |
1383 | unsigned i; |
1384 | ||
fd2d231f MP |
1385 | if (!cc->tfms) |
1386 | return; | |
1387 | ||
d1f96423 | 1388 | for (i = 0; i < cc->tfms_count; i++) |
fd2d231f MP |
1389 | if (cc->tfms[i] && !IS_ERR(cc->tfms[i])) { |
1390 | crypto_free_ablkcipher(cc->tfms[i]); | |
1391 | cc->tfms[i] = NULL; | |
d1f96423 | 1392 | } |
fd2d231f MP |
1393 | |
1394 | kfree(cc->tfms); | |
1395 | cc->tfms = NULL; | |
d1f96423 MB |
1396 | } |
1397 | ||
fd2d231f | 1398 | static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) |
d1f96423 | 1399 | { |
d1f96423 MB |
1400 | unsigned i; |
1401 | int err; | |
1402 | ||
fd2d231f MP |
1403 | cc->tfms = kmalloc(cc->tfms_count * sizeof(struct crypto_ablkcipher *), |
1404 | GFP_KERNEL); | |
1405 | if (!cc->tfms) | |
1406 | return -ENOMEM; | |
1407 | ||
d1f96423 | 1408 | for (i = 0; i < cc->tfms_count; i++) { |
fd2d231f MP |
1409 | cc->tfms[i] = crypto_alloc_ablkcipher(ciphermode, 0, 0); |
1410 | if (IS_ERR(cc->tfms[i])) { | |
1411 | err = PTR_ERR(cc->tfms[i]); | |
1412 | crypt_free_tfms(cc); | |
d1f96423 MB |
1413 | return err; |
1414 | } | |
1415 | } | |
1416 | ||
1417 | return 0; | |
1418 | } | |
1419 | ||
c0297721 AK |
1420 | static int crypt_setkey_allcpus(struct crypt_config *cc) |
1421 | { | |
da31a078 | 1422 | unsigned subkey_size; |
fd2d231f MP |
1423 | int err = 0, i, r; |
1424 | ||
da31a078 MB |
1425 | /* Ignore extra keys (which are used for IV etc) */ |
1426 | subkey_size = (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); | |
1427 | ||
fd2d231f MP |
1428 | for (i = 0; i < cc->tfms_count; i++) { |
1429 | r = crypto_ablkcipher_setkey(cc->tfms[i], | |
1430 | cc->key + (i * subkey_size), | |
1431 | subkey_size); | |
1432 | if (r) | |
1433 | err = r; | |
c0297721 AK |
1434 | } |
1435 | ||
1436 | return err; | |
1437 | } | |
1438 | ||
e48d4bbf MB |
1439 | static int crypt_set_key(struct crypt_config *cc, char *key) |
1440 | { | |
de8be5ac MB |
1441 | int r = -EINVAL; |
1442 | int key_string_len = strlen(key); | |
1443 | ||
69a8cfcd | 1444 | /* The key size may not be changed. */ |
de8be5ac MB |
1445 | if (cc->key_size != (key_string_len >> 1)) |
1446 | goto out; | |
e48d4bbf | 1447 | |
69a8cfcd MB |
1448 | /* Hyphen (which gives a key_size of zero) means there is no key. */ |
1449 | if (!cc->key_size && strcmp(key, "-")) | |
de8be5ac | 1450 | goto out; |
e48d4bbf | 1451 | |
69a8cfcd | 1452 | if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0) |
de8be5ac | 1453 | goto out; |
e48d4bbf MB |
1454 | |
1455 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1456 | ||
de8be5ac MB |
1457 | r = crypt_setkey_allcpus(cc); |
1458 | ||
1459 | out: | |
1460 | /* Hex key string not needed after here, so wipe it. */ | |
1461 | memset(key, '0', key_string_len); | |
1462 | ||
1463 | return r; | |
e48d4bbf MB |
1464 | } |
1465 | ||
1466 | static int crypt_wipe_key(struct crypt_config *cc) | |
1467 | { | |
1468 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1469 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); | |
c0297721 AK |
1470 | |
1471 | return crypt_setkey_allcpus(cc); | |
e48d4bbf MB |
1472 | } |
1473 | ||
28513fcc MB |
1474 | static void crypt_dtr(struct dm_target *ti) |
1475 | { | |
1476 | struct crypt_config *cc = ti->private; | |
1477 | ||
1478 | ti->private = NULL; | |
1479 | ||
1480 | if (!cc) | |
1481 | return; | |
1482 | ||
1483 | if (cc->io_queue) | |
1484 | destroy_workqueue(cc->io_queue); | |
1485 | if (cc->crypt_queue) | |
1486 | destroy_workqueue(cc->crypt_queue); | |
1487 | ||
fd2d231f MP |
1488 | crypt_free_tfms(cc); |
1489 | ||
28513fcc MB |
1490 | if (cc->bs) |
1491 | bioset_free(cc->bs); | |
1492 | ||
1493 | if (cc->page_pool) | |
1494 | mempool_destroy(cc->page_pool); | |
1495 | if (cc->req_pool) | |
1496 | mempool_destroy(cc->req_pool); | |
1497 | if (cc->io_pool) | |
1498 | mempool_destroy(cc->io_pool); | |
1499 | ||
1500 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) | |
1501 | cc->iv_gen_ops->dtr(cc); | |
1502 | ||
28513fcc MB |
1503 | if (cc->dev) |
1504 | dm_put_device(ti, cc->dev); | |
1505 | ||
5ebaee6d | 1506 | kzfree(cc->cipher); |
7dbcd137 | 1507 | kzfree(cc->cipher_string); |
28513fcc MB |
1508 | |
1509 | /* Must zero key material before freeing */ | |
1510 | kzfree(cc); | |
1511 | } | |
1512 | ||
5ebaee6d MB |
1513 | static int crypt_ctr_cipher(struct dm_target *ti, |
1514 | char *cipher_in, char *key) | |
1da177e4 | 1515 | { |
5ebaee6d | 1516 | struct crypt_config *cc = ti->private; |
d1f96423 | 1517 | char *tmp, *cipher, *chainmode, *ivmode, *ivopts, *keycount; |
5ebaee6d | 1518 | char *cipher_api = NULL; |
fd2d231f | 1519 | int ret = -EINVAL; |
31998ef1 | 1520 | char dummy; |
1da177e4 | 1521 | |
5ebaee6d MB |
1522 | /* Convert to crypto api definition? */ |
1523 | if (strchr(cipher_in, '(')) { | |
1524 | ti->error = "Bad cipher specification"; | |
1da177e4 LT |
1525 | return -EINVAL; |
1526 | } | |
1527 | ||
7dbcd137 MB |
1528 | cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); |
1529 | if (!cc->cipher_string) | |
1530 | goto bad_mem; | |
1531 | ||
5ebaee6d MB |
1532 | /* |
1533 | * Legacy dm-crypt cipher specification | |
d1f96423 | 1534 | * cipher[:keycount]-mode-iv:ivopts |
5ebaee6d MB |
1535 | */ |
1536 | tmp = cipher_in; | |
d1f96423 MB |
1537 | keycount = strsep(&tmp, "-"); |
1538 | cipher = strsep(&keycount, ":"); | |
1539 | ||
1540 | if (!keycount) | |
1541 | cc->tfms_count = 1; | |
31998ef1 | 1542 | else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || |
d1f96423 MB |
1543 | !is_power_of_2(cc->tfms_count)) { |
1544 | ti->error = "Bad cipher key count specification"; | |
1545 | return -EINVAL; | |
1546 | } | |
1547 | cc->key_parts = cc->tfms_count; | |
da31a078 | 1548 | cc->key_extra_size = 0; |
5ebaee6d MB |
1549 | |
1550 | cc->cipher = kstrdup(cipher, GFP_KERNEL); | |
1551 | if (!cc->cipher) | |
1552 | goto bad_mem; | |
1553 | ||
1da177e4 LT |
1554 | chainmode = strsep(&tmp, "-"); |
1555 | ivopts = strsep(&tmp, "-"); | |
1556 | ivmode = strsep(&ivopts, ":"); | |
1557 | ||
1558 | if (tmp) | |
5ebaee6d | 1559 | DMWARN("Ignoring unexpected additional cipher options"); |
1da177e4 | 1560 | |
7dbcd137 MB |
1561 | /* |
1562 | * For compatibility with the original dm-crypt mapping format, if | |
1563 | * only the cipher name is supplied, use cbc-plain. | |
1564 | */ | |
5ebaee6d | 1565 | if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) { |
1da177e4 LT |
1566 | chainmode = "cbc"; |
1567 | ivmode = "plain"; | |
1568 | } | |
1569 | ||
d1806f6a | 1570 | if (strcmp(chainmode, "ecb") && !ivmode) { |
5ebaee6d MB |
1571 | ti->error = "IV mechanism required"; |
1572 | return -EINVAL; | |
1da177e4 LT |
1573 | } |
1574 | ||
5ebaee6d MB |
1575 | cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); |
1576 | if (!cipher_api) | |
1577 | goto bad_mem; | |
1578 | ||
1579 | ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, | |
1580 | "%s(%s)", chainmode, cipher); | |
1581 | if (ret < 0) { | |
1582 | kfree(cipher_api); | |
1583 | goto bad_mem; | |
1da177e4 LT |
1584 | } |
1585 | ||
5ebaee6d | 1586 | /* Allocate cipher */ |
fd2d231f MP |
1587 | ret = crypt_alloc_tfms(cc, cipher_api); |
1588 | if (ret < 0) { | |
1589 | ti->error = "Error allocating crypto tfm"; | |
1590 | goto bad; | |
1da177e4 | 1591 | } |
1da177e4 | 1592 | |
5ebaee6d | 1593 | /* Initialize IV */ |
c0297721 | 1594 | cc->iv_size = crypto_ablkcipher_ivsize(any_tfm(cc)); |
5ebaee6d MB |
1595 | if (cc->iv_size) |
1596 | /* at least a 64 bit sector number should fit in our buffer */ | |
1597 | cc->iv_size = max(cc->iv_size, | |
1598 | (unsigned int)(sizeof(u64) / sizeof(u8))); | |
1599 | else if (ivmode) { | |
1600 | DMWARN("Selected cipher does not support IVs"); | |
1601 | ivmode = NULL; | |
1602 | } | |
1603 | ||
1604 | /* Choose ivmode, see comments at iv code. */ | |
1da177e4 LT |
1605 | if (ivmode == NULL) |
1606 | cc->iv_gen_ops = NULL; | |
1607 | else if (strcmp(ivmode, "plain") == 0) | |
1608 | cc->iv_gen_ops = &crypt_iv_plain_ops; | |
61afef61 MB |
1609 | else if (strcmp(ivmode, "plain64") == 0) |
1610 | cc->iv_gen_ops = &crypt_iv_plain64_ops; | |
1da177e4 LT |
1611 | else if (strcmp(ivmode, "essiv") == 0) |
1612 | cc->iv_gen_ops = &crypt_iv_essiv_ops; | |
48527fa7 RS |
1613 | else if (strcmp(ivmode, "benbi") == 0) |
1614 | cc->iv_gen_ops = &crypt_iv_benbi_ops; | |
46b47730 LN |
1615 | else if (strcmp(ivmode, "null") == 0) |
1616 | cc->iv_gen_ops = &crypt_iv_null_ops; | |
34745785 MB |
1617 | else if (strcmp(ivmode, "lmk") == 0) { |
1618 | cc->iv_gen_ops = &crypt_iv_lmk_ops; | |
ed04d981 MB |
1619 | /* |
1620 | * Version 2 and 3 is recognised according | |
34745785 MB |
1621 | * to length of provided multi-key string. |
1622 | * If present (version 3), last key is used as IV seed. | |
ed04d981 | 1623 | * All keys (including IV seed) are always the same size. |
34745785 | 1624 | */ |
da31a078 | 1625 | if (cc->key_size % cc->key_parts) { |
34745785 | 1626 | cc->key_parts++; |
da31a078 MB |
1627 | cc->key_extra_size = cc->key_size / cc->key_parts; |
1628 | } | |
ed04d981 MB |
1629 | } else if (strcmp(ivmode, "tcw") == 0) { |
1630 | cc->iv_gen_ops = &crypt_iv_tcw_ops; | |
1631 | cc->key_parts += 2; /* IV + whitening */ | |
1632 | cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; | |
34745785 | 1633 | } else { |
5ebaee6d | 1634 | ret = -EINVAL; |
72d94861 | 1635 | ti->error = "Invalid IV mode"; |
28513fcc | 1636 | goto bad; |
1da177e4 LT |
1637 | } |
1638 | ||
da31a078 MB |
1639 | /* Initialize and set key */ |
1640 | ret = crypt_set_key(cc, key); | |
1641 | if (ret < 0) { | |
1642 | ti->error = "Error decoding and setting key"; | |
1643 | goto bad; | |
1644 | } | |
1645 | ||
28513fcc MB |
1646 | /* Allocate IV */ |
1647 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { | |
1648 | ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); | |
1649 | if (ret < 0) { | |
1650 | ti->error = "Error creating IV"; | |
1651 | goto bad; | |
1652 | } | |
1653 | } | |
1da177e4 | 1654 | |
28513fcc MB |
1655 | /* Initialize IV (set keys for ESSIV etc) */ |
1656 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) { | |
1657 | ret = cc->iv_gen_ops->init(cc); | |
1658 | if (ret < 0) { | |
1659 | ti->error = "Error initialising IV"; | |
1660 | goto bad; | |
1661 | } | |
b95bf2d3 MB |
1662 | } |
1663 | ||
5ebaee6d MB |
1664 | ret = 0; |
1665 | bad: | |
1666 | kfree(cipher_api); | |
1667 | return ret; | |
1668 | ||
1669 | bad_mem: | |
1670 | ti->error = "Cannot allocate cipher strings"; | |
1671 | return -ENOMEM; | |
1672 | } | |
1673 | ||
1674 | /* | |
1675 | * Construct an encryption mapping: | |
1676 | * <cipher> <key> <iv_offset> <dev_path> <start> | |
1677 | */ | |
1678 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
1679 | { | |
1680 | struct crypt_config *cc; | |
772ae5f5 | 1681 | unsigned int key_size, opt_params; |
5ebaee6d MB |
1682 | unsigned long long tmpll; |
1683 | int ret; | |
772ae5f5 MB |
1684 | struct dm_arg_set as; |
1685 | const char *opt_string; | |
31998ef1 | 1686 | char dummy; |
772ae5f5 MB |
1687 | |
1688 | static struct dm_arg _args[] = { | |
1689 | {0, 1, "Invalid number of feature args"}, | |
1690 | }; | |
5ebaee6d | 1691 | |
772ae5f5 | 1692 | if (argc < 5) { |
5ebaee6d MB |
1693 | ti->error = "Not enough arguments"; |
1694 | return -EINVAL; | |
1da177e4 LT |
1695 | } |
1696 | ||
5ebaee6d MB |
1697 | key_size = strlen(argv[1]) >> 1; |
1698 | ||
1699 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); | |
1700 | if (!cc) { | |
1701 | ti->error = "Cannot allocate encryption context"; | |
1702 | return -ENOMEM; | |
1703 | } | |
69a8cfcd | 1704 | cc->key_size = key_size; |
5ebaee6d MB |
1705 | |
1706 | ti->private = cc; | |
1707 | ret = crypt_ctr_cipher(ti, argv[0], argv[1]); | |
1708 | if (ret < 0) | |
1709 | goto bad; | |
1710 | ||
28513fcc | 1711 | ret = -ENOMEM; |
93d2341c | 1712 | cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool); |
1da177e4 | 1713 | if (!cc->io_pool) { |
72d94861 | 1714 | ti->error = "Cannot allocate crypt io mempool"; |
28513fcc | 1715 | goto bad; |
1da177e4 LT |
1716 | } |
1717 | ||
ddd42edf | 1718 | cc->dmreq_start = sizeof(struct ablkcipher_request); |
c0297721 | 1719 | cc->dmreq_start += crypto_ablkcipher_reqsize(any_tfm(cc)); |
ddd42edf | 1720 | cc->dmreq_start = ALIGN(cc->dmreq_start, crypto_tfm_ctx_alignment()); |
c0297721 | 1721 | cc->dmreq_start += crypto_ablkcipher_alignmask(any_tfm(cc)) & |
3a7f6c99 | 1722 | ~(crypto_tfm_ctx_alignment() - 1); |
ddd42edf MB |
1723 | |
1724 | cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + | |
1725 | sizeof(struct dm_crypt_request) + cc->iv_size); | |
1726 | if (!cc->req_pool) { | |
1727 | ti->error = "Cannot allocate crypt request mempool"; | |
28513fcc | 1728 | goto bad; |
ddd42edf | 1729 | } |
ddd42edf | 1730 | |
a19b27ce | 1731 | cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0); |
1da177e4 | 1732 | if (!cc->page_pool) { |
72d94861 | 1733 | ti->error = "Cannot allocate page mempool"; |
28513fcc | 1734 | goto bad; |
1da177e4 LT |
1735 | } |
1736 | ||
bb799ca0 | 1737 | cc->bs = bioset_create(MIN_IOS, 0); |
6a24c718 MB |
1738 | if (!cc->bs) { |
1739 | ti->error = "Cannot allocate crypt bioset"; | |
28513fcc | 1740 | goto bad; |
6a24c718 MB |
1741 | } |
1742 | ||
28513fcc | 1743 | ret = -EINVAL; |
31998ef1 | 1744 | if (sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1745 | ti->error = "Invalid iv_offset sector"; |
28513fcc | 1746 | goto bad; |
1da177e4 | 1747 | } |
4ee218cd | 1748 | cc->iv_offset = tmpll; |
1da177e4 | 1749 | |
28513fcc MB |
1750 | if (dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev)) { |
1751 | ti->error = "Device lookup failed"; | |
1752 | goto bad; | |
1753 | } | |
1754 | ||
31998ef1 | 1755 | if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1756 | ti->error = "Invalid device sector"; |
28513fcc | 1757 | goto bad; |
1da177e4 | 1758 | } |
4ee218cd | 1759 | cc->start = tmpll; |
1da177e4 | 1760 | |
772ae5f5 MB |
1761 | argv += 5; |
1762 | argc -= 5; | |
1763 | ||
1764 | /* Optional parameters */ | |
1765 | if (argc) { | |
1766 | as.argc = argc; | |
1767 | as.argv = argv; | |
1768 | ||
1769 | ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); | |
1770 | if (ret) | |
1771 | goto bad; | |
1772 | ||
1773 | opt_string = dm_shift_arg(&as); | |
1774 | ||
1775 | if (opt_params == 1 && opt_string && | |
1776 | !strcasecmp(opt_string, "allow_discards")) | |
55a62eef | 1777 | ti->num_discard_bios = 1; |
772ae5f5 MB |
1778 | else if (opt_params) { |
1779 | ret = -EINVAL; | |
1780 | ti->error = "Invalid feature arguments"; | |
1781 | goto bad; | |
1782 | } | |
1783 | } | |
1784 | ||
28513fcc | 1785 | ret = -ENOMEM; |
670368a8 | 1786 | cc->io_queue = alloc_workqueue("kcryptd_io", WQ_MEM_RECLAIM, 1); |
cabf08e4 MB |
1787 | if (!cc->io_queue) { |
1788 | ti->error = "Couldn't create kcryptd io queue"; | |
28513fcc | 1789 | goto bad; |
cabf08e4 MB |
1790 | } |
1791 | ||
c0297721 | 1792 | cc->crypt_queue = alloc_workqueue("kcryptd", |
670368a8 | 1793 | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1); |
cabf08e4 | 1794 | if (!cc->crypt_queue) { |
9934a8be | 1795 | ti->error = "Couldn't create kcryptd queue"; |
28513fcc | 1796 | goto bad; |
9934a8be MB |
1797 | } |
1798 | ||
55a62eef | 1799 | ti->num_flush_bios = 1; |
0ac55489 | 1800 | ti->discard_zeroes_data_unsupported = true; |
983c7db3 | 1801 | |
1da177e4 LT |
1802 | return 0; |
1803 | ||
28513fcc MB |
1804 | bad: |
1805 | crypt_dtr(ti); | |
1806 | return ret; | |
1da177e4 LT |
1807 | } |
1808 | ||
7de3ee57 | 1809 | static int crypt_map(struct dm_target *ti, struct bio *bio) |
1da177e4 | 1810 | { |
028867ac | 1811 | struct dm_crypt_io *io; |
49a8a920 | 1812 | struct crypt_config *cc = ti->private; |
647c7db1 | 1813 | |
772ae5f5 MB |
1814 | /* |
1815 | * If bio is REQ_FLUSH or REQ_DISCARD, just bypass crypt queues. | |
1816 | * - for REQ_FLUSH device-mapper core ensures that no IO is in-flight | |
1817 | * - for REQ_DISCARD caller must use flush if IO ordering matters | |
1818 | */ | |
1819 | if (unlikely(bio->bi_rw & (REQ_FLUSH | REQ_DISCARD))) { | |
647c7db1 | 1820 | bio->bi_bdev = cc->dev->bdev; |
772ae5f5 | 1821 | if (bio_sectors(bio)) |
4f024f37 KO |
1822 | bio->bi_iter.bi_sector = cc->start + |
1823 | dm_target_offset(ti, bio->bi_iter.bi_sector); | |
647c7db1 MP |
1824 | return DM_MAPIO_REMAPPED; |
1825 | } | |
1da177e4 | 1826 | |
4f024f37 | 1827 | io = crypt_io_alloc(cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector)); |
cabf08e4 | 1828 | |
20c82538 MB |
1829 | if (bio_data_dir(io->base_bio) == READ) { |
1830 | if (kcryptd_io_read(io, GFP_NOWAIT)) | |
1831 | kcryptd_queue_io(io); | |
1832 | } else | |
cabf08e4 | 1833 | kcryptd_queue_crypt(io); |
1da177e4 | 1834 | |
d2a7ad29 | 1835 | return DM_MAPIO_SUBMITTED; |
1da177e4 LT |
1836 | } |
1837 | ||
fd7c092e MP |
1838 | static void crypt_status(struct dm_target *ti, status_type_t type, |
1839 | unsigned status_flags, char *result, unsigned maxlen) | |
1da177e4 | 1840 | { |
5ebaee6d | 1841 | struct crypt_config *cc = ti->private; |
fd7c092e | 1842 | unsigned i, sz = 0; |
1da177e4 LT |
1843 | |
1844 | switch (type) { | |
1845 | case STATUSTYPE_INFO: | |
1846 | result[0] = '\0'; | |
1847 | break; | |
1848 | ||
1849 | case STATUSTYPE_TABLE: | |
7dbcd137 | 1850 | DMEMIT("%s ", cc->cipher_string); |
1da177e4 | 1851 | |
fd7c092e MP |
1852 | if (cc->key_size > 0) |
1853 | for (i = 0; i < cc->key_size; i++) | |
1854 | DMEMIT("%02x", cc->key[i]); | |
1855 | else | |
1856 | DMEMIT("-"); | |
1da177e4 | 1857 | |
4ee218cd AM |
1858 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
1859 | cc->dev->name, (unsigned long long)cc->start); | |
772ae5f5 | 1860 | |
55a62eef | 1861 | if (ti->num_discard_bios) |
772ae5f5 MB |
1862 | DMEMIT(" 1 allow_discards"); |
1863 | ||
1da177e4 LT |
1864 | break; |
1865 | } | |
1da177e4 LT |
1866 | } |
1867 | ||
e48d4bbf MB |
1868 | static void crypt_postsuspend(struct dm_target *ti) |
1869 | { | |
1870 | struct crypt_config *cc = ti->private; | |
1871 | ||
1872 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1873 | } | |
1874 | ||
1875 | static int crypt_preresume(struct dm_target *ti) | |
1876 | { | |
1877 | struct crypt_config *cc = ti->private; | |
1878 | ||
1879 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { | |
1880 | DMERR("aborting resume - crypt key is not set."); | |
1881 | return -EAGAIN; | |
1882 | } | |
1883 | ||
1884 | return 0; | |
1885 | } | |
1886 | ||
1887 | static void crypt_resume(struct dm_target *ti) | |
1888 | { | |
1889 | struct crypt_config *cc = ti->private; | |
1890 | ||
1891 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1892 | } | |
1893 | ||
1894 | /* Message interface | |
1895 | * key set <key> | |
1896 | * key wipe | |
1897 | */ | |
1898 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) | |
1899 | { | |
1900 | struct crypt_config *cc = ti->private; | |
542da317 | 1901 | int ret = -EINVAL; |
e48d4bbf MB |
1902 | |
1903 | if (argc < 2) | |
1904 | goto error; | |
1905 | ||
498f0103 | 1906 | if (!strcasecmp(argv[0], "key")) { |
e48d4bbf MB |
1907 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { |
1908 | DMWARN("not suspended during key manipulation."); | |
1909 | return -EINVAL; | |
1910 | } | |
498f0103 | 1911 | if (argc == 3 && !strcasecmp(argv[1], "set")) { |
542da317 MB |
1912 | ret = crypt_set_key(cc, argv[2]); |
1913 | if (ret) | |
1914 | return ret; | |
1915 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) | |
1916 | ret = cc->iv_gen_ops->init(cc); | |
1917 | return ret; | |
1918 | } | |
498f0103 | 1919 | if (argc == 2 && !strcasecmp(argv[1], "wipe")) { |
542da317 MB |
1920 | if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { |
1921 | ret = cc->iv_gen_ops->wipe(cc); | |
1922 | if (ret) | |
1923 | return ret; | |
1924 | } | |
e48d4bbf | 1925 | return crypt_wipe_key(cc); |
542da317 | 1926 | } |
e48d4bbf MB |
1927 | } |
1928 | ||
1929 | error: | |
1930 | DMWARN("unrecognised message received."); | |
1931 | return -EINVAL; | |
1932 | } | |
1933 | ||
d41e26b9 MB |
1934 | static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm, |
1935 | struct bio_vec *biovec, int max_size) | |
1936 | { | |
1937 | struct crypt_config *cc = ti->private; | |
1938 | struct request_queue *q = bdev_get_queue(cc->dev->bdev); | |
1939 | ||
1940 | if (!q->merge_bvec_fn) | |
1941 | return max_size; | |
1942 | ||
1943 | bvm->bi_bdev = cc->dev->bdev; | |
b441a262 | 1944 | bvm->bi_sector = cc->start + dm_target_offset(ti, bvm->bi_sector); |
d41e26b9 MB |
1945 | |
1946 | return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); | |
1947 | } | |
1948 | ||
af4874e0 MS |
1949 | static int crypt_iterate_devices(struct dm_target *ti, |
1950 | iterate_devices_callout_fn fn, void *data) | |
1951 | { | |
1952 | struct crypt_config *cc = ti->private; | |
1953 | ||
5dea271b | 1954 | return fn(ti, cc->dev, cc->start, ti->len, data); |
af4874e0 MS |
1955 | } |
1956 | ||
1da177e4 LT |
1957 | static struct target_type crypt_target = { |
1958 | .name = "crypt", | |
ed04d981 | 1959 | .version = {1, 13, 0}, |
1da177e4 LT |
1960 | .module = THIS_MODULE, |
1961 | .ctr = crypt_ctr, | |
1962 | .dtr = crypt_dtr, | |
1963 | .map = crypt_map, | |
1964 | .status = crypt_status, | |
e48d4bbf MB |
1965 | .postsuspend = crypt_postsuspend, |
1966 | .preresume = crypt_preresume, | |
1967 | .resume = crypt_resume, | |
1968 | .message = crypt_message, | |
d41e26b9 | 1969 | .merge = crypt_merge, |
af4874e0 | 1970 | .iterate_devices = crypt_iterate_devices, |
1da177e4 LT |
1971 | }; |
1972 | ||
1973 | static int __init dm_crypt_init(void) | |
1974 | { | |
1975 | int r; | |
1976 | ||
028867ac | 1977 | _crypt_io_pool = KMEM_CACHE(dm_crypt_io, 0); |
1da177e4 LT |
1978 | if (!_crypt_io_pool) |
1979 | return -ENOMEM; | |
1980 | ||
1da177e4 LT |
1981 | r = dm_register_target(&crypt_target); |
1982 | if (r < 0) { | |
72d94861 | 1983 | DMERR("register failed %d", r); |
9934a8be | 1984 | kmem_cache_destroy(_crypt_io_pool); |
1da177e4 LT |
1985 | } |
1986 | ||
1da177e4 LT |
1987 | return r; |
1988 | } | |
1989 | ||
1990 | static void __exit dm_crypt_exit(void) | |
1991 | { | |
10d3bd09 | 1992 | dm_unregister_target(&crypt_target); |
1da177e4 LT |
1993 | kmem_cache_destroy(_crypt_io_pool); |
1994 | } | |
1995 | ||
1996 | module_init(dm_crypt_init); | |
1997 | module_exit(dm_crypt_exit); | |
1998 | ||
1999 | MODULE_AUTHOR("Christophe Saout <christophe@saout.de>"); | |
2000 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); | |
2001 | MODULE_LICENSE("GPL"); |