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Commit | Line | Data |
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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; |
7145c241 | 127 | struct mutex bio_alloc_lock; |
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 | |
298a9fa0 MP |
165 | unsigned int per_bio_data_size; |
166 | ||
e48d4bbf | 167 | unsigned long flags; |
1da177e4 | 168 | unsigned int key_size; |
da31a078 MB |
169 | unsigned int key_parts; /* independent parts in key buffer */ |
170 | unsigned int key_extra_size; /* additional keys length */ | |
1da177e4 LT |
171 | u8 key[0]; |
172 | }; | |
173 | ||
6a24c718 | 174 | #define MIN_IOS 16 |
1da177e4 | 175 | |
e18b890b | 176 | static struct kmem_cache *_crypt_io_pool; |
1da177e4 | 177 | |
028867ac | 178 | static void clone_init(struct dm_crypt_io *, struct bio *); |
395b167c | 179 | static void kcryptd_queue_crypt(struct dm_crypt_io *io); |
2dc5327d | 180 | static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq); |
027581f3 | 181 | |
c0297721 AK |
182 | /* |
183 | * Use this to access cipher attributes that are the same for each CPU. | |
184 | */ | |
185 | static struct crypto_ablkcipher *any_tfm(struct crypt_config *cc) | |
186 | { | |
fd2d231f | 187 | return cc->tfms[0]; |
c0297721 AK |
188 | } |
189 | ||
1da177e4 LT |
190 | /* |
191 | * Different IV generation algorithms: | |
192 | * | |
3c164bd8 | 193 | * plain: the initial vector is the 32-bit little-endian version of the sector |
3a4fa0a2 | 194 | * number, padded with zeros if necessary. |
1da177e4 | 195 | * |
61afef61 MB |
196 | * plain64: the initial vector is the 64-bit little-endian version of the sector |
197 | * number, padded with zeros if necessary. | |
198 | * | |
3c164bd8 RS |
199 | * essiv: "encrypted sector|salt initial vector", the sector number is |
200 | * encrypted with the bulk cipher using a salt as key. The salt | |
201 | * should be derived from the bulk cipher's key via hashing. | |
1da177e4 | 202 | * |
48527fa7 RS |
203 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
204 | * (needed for LRW-32-AES and possible other narrow block modes) | |
205 | * | |
46b47730 LN |
206 | * null: the initial vector is always zero. Provides compatibility with |
207 | * obsolete loop_fish2 devices. Do not use for new devices. | |
208 | * | |
34745785 MB |
209 | * lmk: Compatible implementation of the block chaining mode used |
210 | * by the Loop-AES block device encryption system | |
211 | * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ | |
212 | * It operates on full 512 byte sectors and uses CBC | |
213 | * with an IV derived from the sector number, the data and | |
214 | * optionally extra IV seed. | |
215 | * This means that after decryption the first block | |
216 | * of sector must be tweaked according to decrypted data. | |
217 | * Loop-AES can use three encryption schemes: | |
218 | * version 1: is plain aes-cbc mode | |
219 | * version 2: uses 64 multikey scheme with lmk IV generator | |
220 | * version 3: the same as version 2 with additional IV seed | |
221 | * (it uses 65 keys, last key is used as IV seed) | |
222 | * | |
ed04d981 MB |
223 | * tcw: Compatible implementation of the block chaining mode used |
224 | * by the TrueCrypt device encryption system (prior to version 4.1). | |
225 | * For more info see: http://www.truecrypt.org | |
226 | * It operates on full 512 byte sectors and uses CBC | |
227 | * with an IV derived from initial key and the sector number. | |
228 | * In addition, whitening value is applied on every sector, whitening | |
229 | * is calculated from initial key, sector number and mixed using CRC32. | |
230 | * Note that this encryption scheme is vulnerable to watermarking attacks | |
231 | * and should be used for old compatible containers access only. | |
232 | * | |
1da177e4 LT |
233 | * plumb: unimplemented, see: |
234 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 | |
235 | */ | |
236 | ||
2dc5327d MB |
237 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, |
238 | struct dm_crypt_request *dmreq) | |
1da177e4 LT |
239 | { |
240 | memset(iv, 0, cc->iv_size); | |
283a8328 | 241 | *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); |
1da177e4 LT |
242 | |
243 | return 0; | |
244 | } | |
245 | ||
61afef61 | 246 | static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, |
2dc5327d | 247 | struct dm_crypt_request *dmreq) |
61afef61 MB |
248 | { |
249 | memset(iv, 0, cc->iv_size); | |
283a8328 | 250 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
61afef61 MB |
251 | |
252 | return 0; | |
253 | } | |
254 | ||
b95bf2d3 MB |
255 | /* Initialise ESSIV - compute salt but no local memory allocations */ |
256 | static int crypt_iv_essiv_init(struct crypt_config *cc) | |
257 | { | |
258 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
259 | struct hash_desc desc; | |
260 | struct scatterlist sg; | |
c0297721 | 261 | struct crypto_cipher *essiv_tfm; |
fd2d231f | 262 | int err; |
b95bf2d3 MB |
263 | |
264 | sg_init_one(&sg, cc->key, cc->key_size); | |
265 | desc.tfm = essiv->hash_tfm; | |
266 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
267 | ||
268 | err = crypto_hash_digest(&desc, &sg, cc->key_size, essiv->salt); | |
269 | if (err) | |
270 | return err; | |
271 | ||
fd2d231f | 272 | essiv_tfm = cc->iv_private; |
c0297721 | 273 | |
fd2d231f MP |
274 | err = crypto_cipher_setkey(essiv_tfm, essiv->salt, |
275 | crypto_hash_digestsize(essiv->hash_tfm)); | |
276 | if (err) | |
277 | return err; | |
c0297721 AK |
278 | |
279 | return 0; | |
b95bf2d3 MB |
280 | } |
281 | ||
542da317 MB |
282 | /* Wipe salt and reset key derived from volume key */ |
283 | static int crypt_iv_essiv_wipe(struct crypt_config *cc) | |
284 | { | |
285 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
286 | unsigned salt_size = crypto_hash_digestsize(essiv->hash_tfm); | |
c0297721 | 287 | struct crypto_cipher *essiv_tfm; |
fd2d231f | 288 | int r, err = 0; |
542da317 MB |
289 | |
290 | memset(essiv->salt, 0, salt_size); | |
291 | ||
fd2d231f MP |
292 | essiv_tfm = cc->iv_private; |
293 | r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size); | |
294 | if (r) | |
295 | err = r; | |
c0297721 AK |
296 | |
297 | return err; | |
298 | } | |
299 | ||
300 | /* Set up per cpu cipher state */ | |
301 | static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc, | |
302 | struct dm_target *ti, | |
303 | u8 *salt, unsigned saltsize) | |
304 | { | |
305 | struct crypto_cipher *essiv_tfm; | |
306 | int err; | |
307 | ||
308 | /* Setup the essiv_tfm with the given salt */ | |
309 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); | |
310 | if (IS_ERR(essiv_tfm)) { | |
311 | ti->error = "Error allocating crypto tfm for ESSIV"; | |
312 | return essiv_tfm; | |
313 | } | |
314 | ||
315 | if (crypto_cipher_blocksize(essiv_tfm) != | |
316 | crypto_ablkcipher_ivsize(any_tfm(cc))) { | |
317 | ti->error = "Block size of ESSIV cipher does " | |
318 | "not match IV size of block cipher"; | |
319 | crypto_free_cipher(essiv_tfm); | |
320 | return ERR_PTR(-EINVAL); | |
321 | } | |
322 | ||
323 | err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); | |
324 | if (err) { | |
325 | ti->error = "Failed to set key for ESSIV cipher"; | |
326 | crypto_free_cipher(essiv_tfm); | |
327 | return ERR_PTR(err); | |
328 | } | |
329 | ||
330 | return essiv_tfm; | |
542da317 MB |
331 | } |
332 | ||
60473592 MB |
333 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) |
334 | { | |
c0297721 | 335 | struct crypto_cipher *essiv_tfm; |
60473592 MB |
336 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; |
337 | ||
b95bf2d3 MB |
338 | crypto_free_hash(essiv->hash_tfm); |
339 | essiv->hash_tfm = NULL; | |
340 | ||
341 | kzfree(essiv->salt); | |
342 | essiv->salt = NULL; | |
c0297721 | 343 | |
fd2d231f | 344 | essiv_tfm = cc->iv_private; |
c0297721 | 345 | |
fd2d231f MP |
346 | if (essiv_tfm) |
347 | crypto_free_cipher(essiv_tfm); | |
c0297721 | 348 | |
fd2d231f | 349 | cc->iv_private = NULL; |
60473592 MB |
350 | } |
351 | ||
1da177e4 | 352 | static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, |
d469f841 | 353 | const char *opts) |
1da177e4 | 354 | { |
5861f1be MB |
355 | struct crypto_cipher *essiv_tfm = NULL; |
356 | struct crypto_hash *hash_tfm = NULL; | |
5861f1be | 357 | u8 *salt = NULL; |
fd2d231f | 358 | int err; |
1da177e4 | 359 | |
5861f1be | 360 | if (!opts) { |
72d94861 | 361 | ti->error = "Digest algorithm missing for ESSIV mode"; |
1da177e4 LT |
362 | return -EINVAL; |
363 | } | |
364 | ||
b95bf2d3 | 365 | /* Allocate hash algorithm */ |
35058687 HX |
366 | hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC); |
367 | if (IS_ERR(hash_tfm)) { | |
72d94861 | 368 | ti->error = "Error initializing ESSIV hash"; |
5861f1be MB |
369 | err = PTR_ERR(hash_tfm); |
370 | goto bad; | |
1da177e4 LT |
371 | } |
372 | ||
b95bf2d3 | 373 | salt = kzalloc(crypto_hash_digestsize(hash_tfm), GFP_KERNEL); |
5861f1be | 374 | if (!salt) { |
72d94861 | 375 | ti->error = "Error kmallocing salt storage in ESSIV"; |
5861f1be MB |
376 | err = -ENOMEM; |
377 | goto bad; | |
1da177e4 LT |
378 | } |
379 | ||
b95bf2d3 | 380 | cc->iv_gen_private.essiv.salt = salt; |
b95bf2d3 MB |
381 | cc->iv_gen_private.essiv.hash_tfm = hash_tfm; |
382 | ||
fd2d231f MP |
383 | essiv_tfm = setup_essiv_cpu(cc, ti, salt, |
384 | crypto_hash_digestsize(hash_tfm)); | |
385 | if (IS_ERR(essiv_tfm)) { | |
386 | crypt_iv_essiv_dtr(cc); | |
387 | return PTR_ERR(essiv_tfm); | |
c0297721 | 388 | } |
fd2d231f | 389 | cc->iv_private = essiv_tfm; |
c0297721 | 390 | |
1da177e4 | 391 | return 0; |
5861f1be MB |
392 | |
393 | bad: | |
5861f1be MB |
394 | if (hash_tfm && !IS_ERR(hash_tfm)) |
395 | crypto_free_hash(hash_tfm); | |
b95bf2d3 | 396 | kfree(salt); |
5861f1be | 397 | return err; |
1da177e4 LT |
398 | } |
399 | ||
2dc5327d MB |
400 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, |
401 | struct dm_crypt_request *dmreq) | |
1da177e4 | 402 | { |
fd2d231f | 403 | struct crypto_cipher *essiv_tfm = cc->iv_private; |
c0297721 | 404 | |
1da177e4 | 405 | memset(iv, 0, cc->iv_size); |
283a8328 | 406 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
c0297721 AK |
407 | crypto_cipher_encrypt_one(essiv_tfm, iv, iv); |
408 | ||
1da177e4 LT |
409 | return 0; |
410 | } | |
411 | ||
48527fa7 RS |
412 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
413 | const char *opts) | |
414 | { | |
c0297721 | 415 | unsigned bs = crypto_ablkcipher_blocksize(any_tfm(cc)); |
f0d1b0b3 | 416 | int log = ilog2(bs); |
48527fa7 RS |
417 | |
418 | /* we need to calculate how far we must shift the sector count | |
419 | * to get the cipher block count, we use this shift in _gen */ | |
420 | ||
421 | if (1 << log != bs) { | |
422 | ti->error = "cypher blocksize is not a power of 2"; | |
423 | return -EINVAL; | |
424 | } | |
425 | ||
426 | if (log > 9) { | |
427 | ti->error = "cypher blocksize is > 512"; | |
428 | return -EINVAL; | |
429 | } | |
430 | ||
60473592 | 431 | cc->iv_gen_private.benbi.shift = 9 - log; |
48527fa7 RS |
432 | |
433 | return 0; | |
434 | } | |
435 | ||
436 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) | |
437 | { | |
48527fa7 RS |
438 | } |
439 | ||
2dc5327d MB |
440 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, |
441 | struct dm_crypt_request *dmreq) | |
48527fa7 | 442 | { |
79066ad3 HX |
443 | __be64 val; |
444 | ||
48527fa7 | 445 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
79066ad3 | 446 | |
2dc5327d | 447 | val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); |
79066ad3 | 448 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); |
48527fa7 | 449 | |
1da177e4 LT |
450 | return 0; |
451 | } | |
452 | ||
2dc5327d MB |
453 | static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, |
454 | struct dm_crypt_request *dmreq) | |
46b47730 LN |
455 | { |
456 | memset(iv, 0, cc->iv_size); | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
34745785 MB |
461 | static void crypt_iv_lmk_dtr(struct crypt_config *cc) |
462 | { | |
463 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
464 | ||
465 | if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) | |
466 | crypto_free_shash(lmk->hash_tfm); | |
467 | lmk->hash_tfm = NULL; | |
468 | ||
469 | kzfree(lmk->seed); | |
470 | lmk->seed = NULL; | |
471 | } | |
472 | ||
473 | static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, | |
474 | const char *opts) | |
475 | { | |
476 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
477 | ||
478 | lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0); | |
479 | if (IS_ERR(lmk->hash_tfm)) { | |
480 | ti->error = "Error initializing LMK hash"; | |
481 | return PTR_ERR(lmk->hash_tfm); | |
482 | } | |
483 | ||
484 | /* No seed in LMK version 2 */ | |
485 | if (cc->key_parts == cc->tfms_count) { | |
486 | lmk->seed = NULL; | |
487 | return 0; | |
488 | } | |
489 | ||
490 | lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); | |
491 | if (!lmk->seed) { | |
492 | crypt_iv_lmk_dtr(cc); | |
493 | ti->error = "Error kmallocing seed storage in LMK"; | |
494 | return -ENOMEM; | |
495 | } | |
496 | ||
497 | return 0; | |
498 | } | |
499 | ||
500 | static int crypt_iv_lmk_init(struct crypt_config *cc) | |
501 | { | |
502 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
503 | int subkey_size = cc->key_size / cc->key_parts; | |
504 | ||
505 | /* LMK seed is on the position of LMK_KEYS + 1 key */ | |
506 | if (lmk->seed) | |
507 | memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), | |
508 | crypto_shash_digestsize(lmk->hash_tfm)); | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
513 | static int crypt_iv_lmk_wipe(struct crypt_config *cc) | |
514 | { | |
515 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
516 | ||
517 | if (lmk->seed) | |
518 | memset(lmk->seed, 0, LMK_SEED_SIZE); | |
519 | ||
520 | return 0; | |
521 | } | |
522 | ||
523 | static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, | |
524 | struct dm_crypt_request *dmreq, | |
525 | u8 *data) | |
526 | { | |
527 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
b6106265 | 528 | SHASH_DESC_ON_STACK(desc, lmk->hash_tfm); |
34745785 | 529 | struct md5_state md5state; |
da31a078 | 530 | __le32 buf[4]; |
34745785 MB |
531 | int i, r; |
532 | ||
b6106265 JSM |
533 | desc->tfm = lmk->hash_tfm; |
534 | desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
34745785 | 535 | |
b6106265 | 536 | r = crypto_shash_init(desc); |
34745785 MB |
537 | if (r) |
538 | return r; | |
539 | ||
540 | if (lmk->seed) { | |
b6106265 | 541 | r = crypto_shash_update(desc, lmk->seed, LMK_SEED_SIZE); |
34745785 MB |
542 | if (r) |
543 | return r; | |
544 | } | |
545 | ||
546 | /* Sector is always 512B, block size 16, add data of blocks 1-31 */ | |
b6106265 | 547 | r = crypto_shash_update(desc, data + 16, 16 * 31); |
34745785 MB |
548 | if (r) |
549 | return r; | |
550 | ||
551 | /* Sector is cropped to 56 bits here */ | |
552 | buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); | |
553 | buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); | |
554 | buf[2] = cpu_to_le32(4024); | |
555 | buf[3] = 0; | |
b6106265 | 556 | r = crypto_shash_update(desc, (u8 *)buf, sizeof(buf)); |
34745785 MB |
557 | if (r) |
558 | return r; | |
559 | ||
560 | /* No MD5 padding here */ | |
b6106265 | 561 | r = crypto_shash_export(desc, &md5state); |
34745785 MB |
562 | if (r) |
563 | return r; | |
564 | ||
565 | for (i = 0; i < MD5_HASH_WORDS; i++) | |
566 | __cpu_to_le32s(&md5state.hash[i]); | |
567 | memcpy(iv, &md5state.hash, cc->iv_size); | |
568 | ||
569 | return 0; | |
570 | } | |
571 | ||
572 | static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, | |
573 | struct dm_crypt_request *dmreq) | |
574 | { | |
575 | u8 *src; | |
576 | int r = 0; | |
577 | ||
578 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { | |
c2e022cb | 579 | src = kmap_atomic(sg_page(&dmreq->sg_in)); |
34745785 | 580 | r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset); |
c2e022cb | 581 | kunmap_atomic(src); |
34745785 MB |
582 | } else |
583 | memset(iv, 0, cc->iv_size); | |
584 | ||
585 | return r; | |
586 | } | |
587 | ||
588 | static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, | |
589 | struct dm_crypt_request *dmreq) | |
590 | { | |
591 | u8 *dst; | |
592 | int r; | |
593 | ||
594 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) | |
595 | return 0; | |
596 | ||
c2e022cb | 597 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); |
34745785 MB |
598 | r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset); |
599 | ||
600 | /* Tweak the first block of plaintext sector */ | |
601 | if (!r) | |
602 | crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size); | |
603 | ||
c2e022cb | 604 | kunmap_atomic(dst); |
34745785 MB |
605 | return r; |
606 | } | |
607 | ||
ed04d981 MB |
608 | static void crypt_iv_tcw_dtr(struct crypt_config *cc) |
609 | { | |
610 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
611 | ||
612 | kzfree(tcw->iv_seed); | |
613 | tcw->iv_seed = NULL; | |
614 | kzfree(tcw->whitening); | |
615 | tcw->whitening = NULL; | |
616 | ||
617 | if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm)) | |
618 | crypto_free_shash(tcw->crc32_tfm); | |
619 | tcw->crc32_tfm = NULL; | |
620 | } | |
621 | ||
622 | static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti, | |
623 | const char *opts) | |
624 | { | |
625 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
626 | ||
627 | if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) { | |
628 | ti->error = "Wrong key size for TCW"; | |
629 | return -EINVAL; | |
630 | } | |
631 | ||
632 | tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0); | |
633 | if (IS_ERR(tcw->crc32_tfm)) { | |
634 | ti->error = "Error initializing CRC32 in TCW"; | |
635 | return PTR_ERR(tcw->crc32_tfm); | |
636 | } | |
637 | ||
638 | tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL); | |
639 | tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL); | |
640 | if (!tcw->iv_seed || !tcw->whitening) { | |
641 | crypt_iv_tcw_dtr(cc); | |
642 | ti->error = "Error allocating seed storage in TCW"; | |
643 | return -ENOMEM; | |
644 | } | |
645 | ||
646 | return 0; | |
647 | } | |
648 | ||
649 | static int crypt_iv_tcw_init(struct crypt_config *cc) | |
650 | { | |
651 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
652 | int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE; | |
653 | ||
654 | memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size); | |
655 | memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size], | |
656 | TCW_WHITENING_SIZE); | |
657 | ||
658 | return 0; | |
659 | } | |
660 | ||
661 | static int crypt_iv_tcw_wipe(struct crypt_config *cc) | |
662 | { | |
663 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
664 | ||
665 | memset(tcw->iv_seed, 0, cc->iv_size); | |
666 | memset(tcw->whitening, 0, TCW_WHITENING_SIZE); | |
667 | ||
668 | return 0; | |
669 | } | |
670 | ||
671 | static int crypt_iv_tcw_whitening(struct crypt_config *cc, | |
672 | struct dm_crypt_request *dmreq, | |
673 | u8 *data) | |
674 | { | |
675 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
676 | u64 sector = cpu_to_le64((u64)dmreq->iv_sector); | |
677 | u8 buf[TCW_WHITENING_SIZE]; | |
b6106265 | 678 | SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm); |
ed04d981 MB |
679 | int i, r; |
680 | ||
681 | /* xor whitening with sector number */ | |
682 | memcpy(buf, tcw->whitening, TCW_WHITENING_SIZE); | |
683 | crypto_xor(buf, (u8 *)§or, 8); | |
684 | crypto_xor(&buf[8], (u8 *)§or, 8); | |
685 | ||
686 | /* calculate crc32 for every 32bit part and xor it */ | |
b6106265 JSM |
687 | desc->tfm = tcw->crc32_tfm; |
688 | desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
ed04d981 | 689 | for (i = 0; i < 4; i++) { |
b6106265 | 690 | r = crypto_shash_init(desc); |
ed04d981 MB |
691 | if (r) |
692 | goto out; | |
b6106265 | 693 | r = crypto_shash_update(desc, &buf[i * 4], 4); |
ed04d981 MB |
694 | if (r) |
695 | goto out; | |
b6106265 | 696 | r = crypto_shash_final(desc, &buf[i * 4]); |
ed04d981 MB |
697 | if (r) |
698 | goto out; | |
699 | } | |
700 | crypto_xor(&buf[0], &buf[12], 4); | |
701 | crypto_xor(&buf[4], &buf[8], 4); | |
702 | ||
703 | /* apply whitening (8 bytes) to whole sector */ | |
704 | for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++) | |
705 | crypto_xor(data + i * 8, buf, 8); | |
706 | out: | |
1a71d6ff | 707 | memzero_explicit(buf, sizeof(buf)); |
ed04d981 MB |
708 | return r; |
709 | } | |
710 | ||
711 | static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, | |
712 | struct dm_crypt_request *dmreq) | |
713 | { | |
714 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
715 | u64 sector = cpu_to_le64((u64)dmreq->iv_sector); | |
716 | u8 *src; | |
717 | int r = 0; | |
718 | ||
719 | /* Remove whitening from ciphertext */ | |
720 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { | |
721 | src = kmap_atomic(sg_page(&dmreq->sg_in)); | |
722 | r = crypt_iv_tcw_whitening(cc, dmreq, src + dmreq->sg_in.offset); | |
723 | kunmap_atomic(src); | |
724 | } | |
725 | ||
726 | /* Calculate IV */ | |
727 | memcpy(iv, tcw->iv_seed, cc->iv_size); | |
728 | crypto_xor(iv, (u8 *)§or, 8); | |
729 | if (cc->iv_size > 8) | |
730 | crypto_xor(&iv[8], (u8 *)§or, cc->iv_size - 8); | |
731 | ||
732 | return r; | |
733 | } | |
734 | ||
735 | static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, | |
736 | struct dm_crypt_request *dmreq) | |
737 | { | |
738 | u8 *dst; | |
739 | int r; | |
740 | ||
741 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) | |
742 | return 0; | |
743 | ||
744 | /* Apply whitening on ciphertext */ | |
745 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); | |
746 | r = crypt_iv_tcw_whitening(cc, dmreq, dst + dmreq->sg_out.offset); | |
747 | kunmap_atomic(dst); | |
748 | ||
749 | return r; | |
750 | } | |
751 | ||
1da177e4 LT |
752 | static struct crypt_iv_operations crypt_iv_plain_ops = { |
753 | .generator = crypt_iv_plain_gen | |
754 | }; | |
755 | ||
61afef61 MB |
756 | static struct crypt_iv_operations crypt_iv_plain64_ops = { |
757 | .generator = crypt_iv_plain64_gen | |
758 | }; | |
759 | ||
1da177e4 LT |
760 | static struct crypt_iv_operations crypt_iv_essiv_ops = { |
761 | .ctr = crypt_iv_essiv_ctr, | |
762 | .dtr = crypt_iv_essiv_dtr, | |
b95bf2d3 | 763 | .init = crypt_iv_essiv_init, |
542da317 | 764 | .wipe = crypt_iv_essiv_wipe, |
1da177e4 LT |
765 | .generator = crypt_iv_essiv_gen |
766 | }; | |
767 | ||
48527fa7 RS |
768 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
769 | .ctr = crypt_iv_benbi_ctr, | |
770 | .dtr = crypt_iv_benbi_dtr, | |
771 | .generator = crypt_iv_benbi_gen | |
772 | }; | |
1da177e4 | 773 | |
46b47730 LN |
774 | static struct crypt_iv_operations crypt_iv_null_ops = { |
775 | .generator = crypt_iv_null_gen | |
776 | }; | |
777 | ||
34745785 MB |
778 | static struct crypt_iv_operations crypt_iv_lmk_ops = { |
779 | .ctr = crypt_iv_lmk_ctr, | |
780 | .dtr = crypt_iv_lmk_dtr, | |
781 | .init = crypt_iv_lmk_init, | |
782 | .wipe = crypt_iv_lmk_wipe, | |
783 | .generator = crypt_iv_lmk_gen, | |
784 | .post = crypt_iv_lmk_post | |
785 | }; | |
786 | ||
ed04d981 MB |
787 | static struct crypt_iv_operations crypt_iv_tcw_ops = { |
788 | .ctr = crypt_iv_tcw_ctr, | |
789 | .dtr = crypt_iv_tcw_dtr, | |
790 | .init = crypt_iv_tcw_init, | |
791 | .wipe = crypt_iv_tcw_wipe, | |
792 | .generator = crypt_iv_tcw_gen, | |
793 | .post = crypt_iv_tcw_post | |
794 | }; | |
795 | ||
d469f841 MB |
796 | static void crypt_convert_init(struct crypt_config *cc, |
797 | struct convert_context *ctx, | |
798 | struct bio *bio_out, struct bio *bio_in, | |
fcd369da | 799 | sector_t sector) |
1da177e4 LT |
800 | { |
801 | ctx->bio_in = bio_in; | |
802 | ctx->bio_out = bio_out; | |
003b5c57 KO |
803 | if (bio_in) |
804 | ctx->iter_in = bio_in->bi_iter; | |
805 | if (bio_out) | |
806 | ctx->iter_out = bio_out->bi_iter; | |
c66029f4 | 807 | ctx->cc_sector = sector + cc->iv_offset; |
43d69034 | 808 | init_completion(&ctx->restart); |
1da177e4 LT |
809 | } |
810 | ||
b2174eeb HY |
811 | static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, |
812 | struct ablkcipher_request *req) | |
813 | { | |
814 | return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); | |
815 | } | |
816 | ||
817 | static struct ablkcipher_request *req_of_dmreq(struct crypt_config *cc, | |
818 | struct dm_crypt_request *dmreq) | |
819 | { | |
820 | return (struct ablkcipher_request *)((char *)dmreq - cc->dmreq_start); | |
821 | } | |
822 | ||
2dc5327d MB |
823 | static u8 *iv_of_dmreq(struct crypt_config *cc, |
824 | struct dm_crypt_request *dmreq) | |
825 | { | |
826 | return (u8 *)ALIGN((unsigned long)(dmreq + 1), | |
827 | crypto_ablkcipher_alignmask(any_tfm(cc)) + 1); | |
828 | } | |
829 | ||
01482b76 | 830 | static int crypt_convert_block(struct crypt_config *cc, |
3a7f6c99 MB |
831 | struct convert_context *ctx, |
832 | struct ablkcipher_request *req) | |
01482b76 | 833 | { |
003b5c57 KO |
834 | struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); |
835 | struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); | |
3a7f6c99 MB |
836 | struct dm_crypt_request *dmreq; |
837 | u8 *iv; | |
40b6229b | 838 | int r; |
3a7f6c99 | 839 | |
b2174eeb | 840 | dmreq = dmreq_of_req(cc, req); |
2dc5327d | 841 | iv = iv_of_dmreq(cc, dmreq); |
01482b76 | 842 | |
c66029f4 | 843 | dmreq->iv_sector = ctx->cc_sector; |
b2174eeb | 844 | dmreq->ctx = ctx; |
3a7f6c99 | 845 | sg_init_table(&dmreq->sg_in, 1); |
003b5c57 KO |
846 | sg_set_page(&dmreq->sg_in, bv_in.bv_page, 1 << SECTOR_SHIFT, |
847 | bv_in.bv_offset); | |
01482b76 | 848 | |
3a7f6c99 | 849 | sg_init_table(&dmreq->sg_out, 1); |
003b5c57 KO |
850 | sg_set_page(&dmreq->sg_out, bv_out.bv_page, 1 << SECTOR_SHIFT, |
851 | bv_out.bv_offset); | |
01482b76 | 852 | |
003b5c57 KO |
853 | bio_advance_iter(ctx->bio_in, &ctx->iter_in, 1 << SECTOR_SHIFT); |
854 | bio_advance_iter(ctx->bio_out, &ctx->iter_out, 1 << SECTOR_SHIFT); | |
01482b76 | 855 | |
3a7f6c99 | 856 | if (cc->iv_gen_ops) { |
2dc5327d | 857 | r = cc->iv_gen_ops->generator(cc, iv, dmreq); |
3a7f6c99 MB |
858 | if (r < 0) |
859 | return r; | |
860 | } | |
861 | ||
862 | ablkcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out, | |
863 | 1 << SECTOR_SHIFT, iv); | |
864 | ||
865 | if (bio_data_dir(ctx->bio_in) == WRITE) | |
866 | r = crypto_ablkcipher_encrypt(req); | |
867 | else | |
868 | r = crypto_ablkcipher_decrypt(req); | |
869 | ||
2dc5327d MB |
870 | if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) |
871 | r = cc->iv_gen_ops->post(cc, iv, dmreq); | |
872 | ||
3a7f6c99 | 873 | return r; |
01482b76 MB |
874 | } |
875 | ||
95497a96 MB |
876 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
877 | int error); | |
c0297721 | 878 | |
ddd42edf MB |
879 | static void crypt_alloc_req(struct crypt_config *cc, |
880 | struct convert_context *ctx) | |
881 | { | |
c66029f4 | 882 | unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1); |
c0297721 | 883 | |
610f2de3 MP |
884 | if (!ctx->req) |
885 | ctx->req = mempool_alloc(cc->req_pool, GFP_NOIO); | |
c0297721 | 886 | |
610f2de3 MP |
887 | ablkcipher_request_set_tfm(ctx->req, cc->tfms[key_index]); |
888 | ablkcipher_request_set_callback(ctx->req, | |
c0297721 | 889 | CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, |
610f2de3 | 890 | kcryptd_async_done, dmreq_of_req(cc, ctx->req)); |
ddd42edf MB |
891 | } |
892 | ||
298a9fa0 MP |
893 | static void crypt_free_req(struct crypt_config *cc, |
894 | struct ablkcipher_request *req, struct bio *base_bio) | |
895 | { | |
896 | struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); | |
897 | ||
898 | if ((struct ablkcipher_request *)(io + 1) != req) | |
899 | mempool_free(req, cc->req_pool); | |
900 | } | |
901 | ||
1da177e4 LT |
902 | /* |
903 | * Encrypt / decrypt data from one bio to another one (can be the same one) | |
904 | */ | |
905 | static int crypt_convert(struct crypt_config *cc, | |
d469f841 | 906 | struct convert_context *ctx) |
1da177e4 | 907 | { |
3f1e9070 | 908 | int r; |
1da177e4 | 909 | |
40b6229b | 910 | atomic_set(&ctx->cc_pending, 1); |
c8081618 | 911 | |
003b5c57 | 912 | while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) { |
1da177e4 | 913 | |
3a7f6c99 MB |
914 | crypt_alloc_req(cc, ctx); |
915 | ||
40b6229b | 916 | atomic_inc(&ctx->cc_pending); |
3f1e9070 | 917 | |
610f2de3 | 918 | r = crypt_convert_block(cc, ctx, ctx->req); |
3a7f6c99 MB |
919 | |
920 | switch (r) { | |
3f1e9070 | 921 | /* async */ |
3a7f6c99 MB |
922 | case -EBUSY: |
923 | wait_for_completion(&ctx->restart); | |
16735d02 | 924 | reinit_completion(&ctx->restart); |
3a7f6c99 MB |
925 | /* fall through*/ |
926 | case -EINPROGRESS: | |
610f2de3 | 927 | ctx->req = NULL; |
c66029f4 | 928 | ctx->cc_sector++; |
3f1e9070 MB |
929 | continue; |
930 | ||
931 | /* sync */ | |
3a7f6c99 | 932 | case 0: |
40b6229b | 933 | atomic_dec(&ctx->cc_pending); |
c66029f4 | 934 | ctx->cc_sector++; |
c7f1b204 | 935 | cond_resched(); |
3a7f6c99 | 936 | continue; |
3a7f6c99 | 937 | |
3f1e9070 MB |
938 | /* error */ |
939 | default: | |
40b6229b | 940 | atomic_dec(&ctx->cc_pending); |
3f1e9070 MB |
941 | return r; |
942 | } | |
1da177e4 LT |
943 | } |
944 | ||
3f1e9070 | 945 | return 0; |
1da177e4 LT |
946 | } |
947 | ||
cf2f1abf MP |
948 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone); |
949 | ||
1da177e4 LT |
950 | /* |
951 | * Generate a new unfragmented bio with the given size | |
952 | * This should never violate the device limitations | |
7145c241 MP |
953 | * |
954 | * This function may be called concurrently. If we allocate from the mempool | |
955 | * concurrently, there is a possibility of deadlock. For example, if we have | |
956 | * mempool of 256 pages, two processes, each wanting 256, pages allocate from | |
957 | * the mempool concurrently, it may deadlock in a situation where both processes | |
958 | * have allocated 128 pages and the mempool is exhausted. | |
959 | * | |
960 | * In order to avoid this scenario we allocate the pages under a mutex. | |
961 | * | |
962 | * In order to not degrade performance with excessive locking, we try | |
963 | * non-blocking allocations without a mutex first but on failure we fallback | |
964 | * to blocking allocations with a mutex. | |
1da177e4 | 965 | */ |
cf2f1abf | 966 | static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size) |
1da177e4 | 967 | { |
49a8a920 | 968 | struct crypt_config *cc = io->cc; |
8b004457 | 969 | struct bio *clone; |
1da177e4 | 970 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
7145c241 MP |
971 | gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM; |
972 | unsigned i, len, remaining_size; | |
91e10625 | 973 | struct page *page; |
cf2f1abf | 974 | struct bio_vec *bvec; |
1da177e4 | 975 | |
7145c241 MP |
976 | retry: |
977 | if (unlikely(gfp_mask & __GFP_WAIT)) | |
978 | mutex_lock(&cc->bio_alloc_lock); | |
979 | ||
2f9941b6 | 980 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
8b004457 | 981 | if (!clone) |
7145c241 | 982 | goto return_clone; |
1da177e4 | 983 | |
027581f3 | 984 | clone_init(io, clone); |
6a24c718 | 985 | |
7145c241 MP |
986 | remaining_size = size; |
987 | ||
f97380bc | 988 | for (i = 0; i < nr_iovecs; i++) { |
91e10625 | 989 | page = mempool_alloc(cc->page_pool, gfp_mask); |
7145c241 MP |
990 | if (!page) { |
991 | crypt_free_buffer_pages(cc, clone); | |
992 | bio_put(clone); | |
993 | gfp_mask |= __GFP_WAIT; | |
994 | goto retry; | |
995 | } | |
1da177e4 | 996 | |
7145c241 | 997 | len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size; |
91e10625 | 998 | |
cf2f1abf MP |
999 | bvec = &clone->bi_io_vec[clone->bi_vcnt++]; |
1000 | bvec->bv_page = page; | |
1001 | bvec->bv_len = len; | |
1002 | bvec->bv_offset = 0; | |
1da177e4 | 1003 | |
cf2f1abf | 1004 | clone->bi_iter.bi_size += len; |
1da177e4 | 1005 | |
7145c241 | 1006 | remaining_size -= len; |
1da177e4 LT |
1007 | } |
1008 | ||
7145c241 MP |
1009 | return_clone: |
1010 | if (unlikely(gfp_mask & __GFP_WAIT)) | |
1011 | mutex_unlock(&cc->bio_alloc_lock); | |
1012 | ||
8b004457 | 1013 | return clone; |
1da177e4 LT |
1014 | } |
1015 | ||
644bd2f0 | 1016 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) |
1da177e4 | 1017 | { |
644bd2f0 | 1018 | unsigned int i; |
1da177e4 LT |
1019 | struct bio_vec *bv; |
1020 | ||
cb34e057 | 1021 | bio_for_each_segment_all(bv, clone, i) { |
1da177e4 LT |
1022 | BUG_ON(!bv->bv_page); |
1023 | mempool_free(bv->bv_page, cc->page_pool); | |
1024 | bv->bv_page = NULL; | |
1025 | } | |
1026 | } | |
1027 | ||
298a9fa0 MP |
1028 | static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc, |
1029 | struct bio *bio, sector_t sector) | |
dc440d1e | 1030 | { |
49a8a920 | 1031 | io->cc = cc; |
dc440d1e MB |
1032 | io->base_bio = bio; |
1033 | io->sector = sector; | |
1034 | io->error = 0; | |
610f2de3 | 1035 | io->ctx.req = NULL; |
40b6229b | 1036 | atomic_set(&io->io_pending, 0); |
dc440d1e MB |
1037 | } |
1038 | ||
3e1a8bdd MB |
1039 | static void crypt_inc_pending(struct dm_crypt_io *io) |
1040 | { | |
40b6229b | 1041 | atomic_inc(&io->io_pending); |
3e1a8bdd MB |
1042 | } |
1043 | ||
1da177e4 LT |
1044 | /* |
1045 | * One of the bios was finished. Check for completion of | |
1046 | * the whole request and correctly clean up the buffer. | |
1047 | */ | |
5742fd77 | 1048 | static void crypt_dec_pending(struct dm_crypt_io *io) |
1da177e4 | 1049 | { |
49a8a920 | 1050 | struct crypt_config *cc = io->cc; |
b35f8caa | 1051 | struct bio *base_bio = io->base_bio; |
b35f8caa | 1052 | int error = io->error; |
1da177e4 | 1053 | |
40b6229b | 1054 | if (!atomic_dec_and_test(&io->io_pending)) |
1da177e4 LT |
1055 | return; |
1056 | ||
610f2de3 | 1057 | if (io->ctx.req) |
298a9fa0 MP |
1058 | crypt_free_req(cc, io->ctx.req, base_bio); |
1059 | if (io != dm_per_bio_data(base_bio, cc->per_bio_data_size)) | |
1060 | mempool_free(io, cc->io_pool); | |
b35f8caa | 1061 | |
cf2f1abf | 1062 | bio_endio(base_bio, error); |
1da177e4 LT |
1063 | } |
1064 | ||
1065 | /* | |
cabf08e4 | 1066 | * kcryptd/kcryptd_io: |
1da177e4 LT |
1067 | * |
1068 | * Needed because it would be very unwise to do decryption in an | |
23541d2d | 1069 | * interrupt context. |
cabf08e4 MB |
1070 | * |
1071 | * kcryptd performs the actual encryption or decryption. | |
1072 | * | |
1073 | * kcryptd_io performs the IO submission. | |
1074 | * | |
1075 | * They must be separated as otherwise the final stages could be | |
1076 | * starved by new requests which can block in the first stages due | |
1077 | * to memory allocation. | |
c0297721 AK |
1078 | * |
1079 | * The work is done per CPU global for all dm-crypt instances. | |
1080 | * They should not depend on each other and do not block. | |
1da177e4 | 1081 | */ |
6712ecf8 | 1082 | static void crypt_endio(struct bio *clone, int error) |
8b004457 | 1083 | { |
028867ac | 1084 | struct dm_crypt_io *io = clone->bi_private; |
49a8a920 | 1085 | struct crypt_config *cc = io->cc; |
ee7a491e | 1086 | unsigned rw = bio_data_dir(clone); |
8b004457 | 1087 | |
adfe4770 MB |
1088 | if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error)) |
1089 | error = -EIO; | |
1090 | ||
8b004457 | 1091 | /* |
6712ecf8 | 1092 | * free the processed pages |
8b004457 | 1093 | */ |
ee7a491e | 1094 | if (rw == WRITE) |
644bd2f0 | 1095 | crypt_free_buffer_pages(cc, clone); |
8b004457 MB |
1096 | |
1097 | bio_put(clone); | |
8b004457 | 1098 | |
ee7a491e MB |
1099 | if (rw == READ && !error) { |
1100 | kcryptd_queue_crypt(io); | |
1101 | return; | |
1102 | } | |
5742fd77 MB |
1103 | |
1104 | if (unlikely(error)) | |
1105 | io->error = error; | |
1106 | ||
1107 | crypt_dec_pending(io); | |
8b004457 MB |
1108 | } |
1109 | ||
028867ac | 1110 | static void clone_init(struct dm_crypt_io *io, struct bio *clone) |
8b004457 | 1111 | { |
49a8a920 | 1112 | struct crypt_config *cc = io->cc; |
8b004457 MB |
1113 | |
1114 | clone->bi_private = io; | |
1115 | clone->bi_end_io = crypt_endio; | |
1116 | clone->bi_bdev = cc->dev->bdev; | |
1117 | clone->bi_rw = io->base_bio->bi_rw; | |
1118 | } | |
1119 | ||
20c82538 | 1120 | static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) |
8b004457 | 1121 | { |
49a8a920 | 1122 | struct crypt_config *cc = io->cc; |
8b004457 MB |
1123 | struct bio *base_bio = io->base_bio; |
1124 | struct bio *clone; | |
93e605c2 | 1125 | |
8b004457 MB |
1126 | /* |
1127 | * The block layer might modify the bvec array, so always | |
1128 | * copy the required bvecs because we need the original | |
1129 | * one in order to decrypt the whole bio data *afterwards*. | |
1130 | */ | |
bf800ef1 | 1131 | clone = bio_clone_bioset(base_bio, gfp, cc->bs); |
7eaceacc | 1132 | if (!clone) |
20c82538 | 1133 | return 1; |
8b004457 | 1134 | |
20c82538 MB |
1135 | crypt_inc_pending(io); |
1136 | ||
8b004457 | 1137 | clone_init(io, clone); |
4f024f37 | 1138 | clone->bi_iter.bi_sector = cc->start + io->sector; |
8b004457 | 1139 | |
93e605c2 | 1140 | generic_make_request(clone); |
20c82538 | 1141 | return 0; |
8b004457 MB |
1142 | } |
1143 | ||
4e4eef64 MB |
1144 | static void kcryptd_io_write(struct dm_crypt_io *io) |
1145 | { | |
95497a96 | 1146 | struct bio *clone = io->ctx.bio_out; |
95497a96 | 1147 | generic_make_request(clone); |
4e4eef64 MB |
1148 | } |
1149 | ||
395b167c AK |
1150 | static void kcryptd_io(struct work_struct *work) |
1151 | { | |
1152 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); | |
1153 | ||
20c82538 MB |
1154 | if (bio_data_dir(io->base_bio) == READ) { |
1155 | crypt_inc_pending(io); | |
1156 | if (kcryptd_io_read(io, GFP_NOIO)) | |
1157 | io->error = -ENOMEM; | |
1158 | crypt_dec_pending(io); | |
1159 | } else | |
395b167c AK |
1160 | kcryptd_io_write(io); |
1161 | } | |
1162 | ||
1163 | static void kcryptd_queue_io(struct dm_crypt_io *io) | |
1164 | { | |
49a8a920 | 1165 | struct crypt_config *cc = io->cc; |
395b167c AK |
1166 | |
1167 | INIT_WORK(&io->work, kcryptd_io); | |
1168 | queue_work(cc->io_queue, &io->work); | |
1169 | } | |
1170 | ||
72c6e7af | 1171 | static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) |
4e4eef64 | 1172 | { |
dec1cedf | 1173 | struct bio *clone = io->ctx.bio_out; |
49a8a920 | 1174 | struct crypt_config *cc = io->cc; |
dec1cedf | 1175 | |
72c6e7af | 1176 | if (unlikely(io->error < 0)) { |
dec1cedf MB |
1177 | crypt_free_buffer_pages(cc, clone); |
1178 | bio_put(clone); | |
6c031f41 | 1179 | crypt_dec_pending(io); |
dec1cedf MB |
1180 | return; |
1181 | } | |
1182 | ||
1183 | /* crypt_convert should have filled the clone bio */ | |
003b5c57 | 1184 | BUG_ON(io->ctx.iter_out.bi_size); |
dec1cedf | 1185 | |
4f024f37 | 1186 | clone->bi_iter.bi_sector = cc->start + io->sector; |
899c95d3 | 1187 | |
95497a96 MB |
1188 | if (async) |
1189 | kcryptd_queue_io(io); | |
1e37bb8e | 1190 | else |
95497a96 | 1191 | generic_make_request(clone); |
4e4eef64 MB |
1192 | } |
1193 | ||
fc5a5e9a | 1194 | static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) |
8b004457 | 1195 | { |
49a8a920 | 1196 | struct crypt_config *cc = io->cc; |
8b004457 | 1197 | struct bio *clone; |
c8081618 | 1198 | int crypt_finished; |
b635b00e | 1199 | sector_t sector = io->sector; |
dec1cedf | 1200 | int r; |
8b004457 | 1201 | |
fc5a5e9a MB |
1202 | /* |
1203 | * Prevent io from disappearing until this function completes. | |
1204 | */ | |
1205 | crypt_inc_pending(io); | |
b635b00e | 1206 | crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); |
fc5a5e9a | 1207 | |
cf2f1abf MP |
1208 | clone = crypt_alloc_buffer(io, io->base_bio->bi_iter.bi_size); |
1209 | if (unlikely(!clone)) { | |
1210 | io->error = -EIO; | |
1211 | goto dec; | |
1212 | } | |
c8081618 | 1213 | |
cf2f1abf MP |
1214 | io->ctx.bio_out = clone; |
1215 | io->ctx.iter_out = clone->bi_iter; | |
b635b00e | 1216 | |
cf2f1abf | 1217 | sector += bio_sectors(clone); |
93e605c2 | 1218 | |
cf2f1abf MP |
1219 | crypt_inc_pending(io); |
1220 | r = crypt_convert(cc, &io->ctx); | |
1221 | if (r) | |
1222 | io->error = -EIO; | |
1223 | crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending); | |
933f01d4 | 1224 | |
cf2f1abf MP |
1225 | /* Encryption was already finished, submit io now */ |
1226 | if (crypt_finished) { | |
1227 | kcryptd_crypt_write_io_submit(io, 0); | |
1228 | io->sector = sector; | |
93e605c2 | 1229 | } |
899c95d3 | 1230 | |
cf2f1abf | 1231 | dec: |
899c95d3 | 1232 | crypt_dec_pending(io); |
84131db6 MB |
1233 | } |
1234 | ||
72c6e7af | 1235 | static void kcryptd_crypt_read_done(struct dm_crypt_io *io) |
5742fd77 | 1236 | { |
5742fd77 MB |
1237 | crypt_dec_pending(io); |
1238 | } | |
1239 | ||
4e4eef64 | 1240 | static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) |
8b004457 | 1241 | { |
49a8a920 | 1242 | struct crypt_config *cc = io->cc; |
5742fd77 | 1243 | int r = 0; |
1da177e4 | 1244 | |
3e1a8bdd | 1245 | crypt_inc_pending(io); |
3a7f6c99 | 1246 | |
53017030 | 1247 | crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, |
0c395b0f | 1248 | io->sector); |
1da177e4 | 1249 | |
5742fd77 | 1250 | r = crypt_convert(cc, &io->ctx); |
72c6e7af MP |
1251 | if (r < 0) |
1252 | io->error = -EIO; | |
5742fd77 | 1253 | |
40b6229b | 1254 | if (atomic_dec_and_test(&io->ctx.cc_pending)) |
72c6e7af | 1255 | kcryptd_crypt_read_done(io); |
3a7f6c99 MB |
1256 | |
1257 | crypt_dec_pending(io); | |
1da177e4 LT |
1258 | } |
1259 | ||
95497a96 MB |
1260 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
1261 | int error) | |
1262 | { | |
b2174eeb HY |
1263 | struct dm_crypt_request *dmreq = async_req->data; |
1264 | struct convert_context *ctx = dmreq->ctx; | |
95497a96 | 1265 | struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); |
49a8a920 | 1266 | struct crypt_config *cc = io->cc; |
95497a96 MB |
1267 | |
1268 | if (error == -EINPROGRESS) { | |
1269 | complete(&ctx->restart); | |
1270 | return; | |
1271 | } | |
1272 | ||
2dc5327d MB |
1273 | if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) |
1274 | error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq); | |
1275 | ||
72c6e7af MP |
1276 | if (error < 0) |
1277 | io->error = -EIO; | |
1278 | ||
298a9fa0 | 1279 | crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio); |
95497a96 | 1280 | |
40b6229b | 1281 | if (!atomic_dec_and_test(&ctx->cc_pending)) |
95497a96 MB |
1282 | return; |
1283 | ||
1284 | if (bio_data_dir(io->base_bio) == READ) | |
72c6e7af | 1285 | kcryptd_crypt_read_done(io); |
95497a96 | 1286 | else |
72c6e7af | 1287 | kcryptd_crypt_write_io_submit(io, 1); |
95497a96 MB |
1288 | } |
1289 | ||
395b167c | 1290 | static void kcryptd_crypt(struct work_struct *work) |
1da177e4 | 1291 | { |
028867ac | 1292 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
8b004457 | 1293 | |
cabf08e4 | 1294 | if (bio_data_dir(io->base_bio) == READ) |
395b167c | 1295 | kcryptd_crypt_read_convert(io); |
4e4eef64 | 1296 | else |
395b167c | 1297 | kcryptd_crypt_write_convert(io); |
cabf08e4 MB |
1298 | } |
1299 | ||
395b167c | 1300 | static void kcryptd_queue_crypt(struct dm_crypt_io *io) |
cabf08e4 | 1301 | { |
49a8a920 | 1302 | struct crypt_config *cc = io->cc; |
cabf08e4 | 1303 | |
395b167c AK |
1304 | INIT_WORK(&io->work, kcryptd_crypt); |
1305 | queue_work(cc->crypt_queue, &io->work); | |
1da177e4 LT |
1306 | } |
1307 | ||
1308 | /* | |
1309 | * Decode key from its hex representation | |
1310 | */ | |
1311 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) | |
1312 | { | |
1313 | char buffer[3]; | |
1da177e4 LT |
1314 | unsigned int i; |
1315 | ||
1316 | buffer[2] = '\0'; | |
1317 | ||
8b004457 | 1318 | for (i = 0; i < size; i++) { |
1da177e4 LT |
1319 | buffer[0] = *hex++; |
1320 | buffer[1] = *hex++; | |
1321 | ||
1a66a08a | 1322 | if (kstrtou8(buffer, 16, &key[i])) |
1da177e4 LT |
1323 | return -EINVAL; |
1324 | } | |
1325 | ||
1326 | if (*hex != '\0') | |
1327 | return -EINVAL; | |
1328 | ||
1329 | return 0; | |
1330 | } | |
1331 | ||
fd2d231f | 1332 | static void crypt_free_tfms(struct crypt_config *cc) |
d1f96423 | 1333 | { |
d1f96423 MB |
1334 | unsigned i; |
1335 | ||
fd2d231f MP |
1336 | if (!cc->tfms) |
1337 | return; | |
1338 | ||
d1f96423 | 1339 | for (i = 0; i < cc->tfms_count; i++) |
fd2d231f MP |
1340 | if (cc->tfms[i] && !IS_ERR(cc->tfms[i])) { |
1341 | crypto_free_ablkcipher(cc->tfms[i]); | |
1342 | cc->tfms[i] = NULL; | |
d1f96423 | 1343 | } |
fd2d231f MP |
1344 | |
1345 | kfree(cc->tfms); | |
1346 | cc->tfms = NULL; | |
d1f96423 MB |
1347 | } |
1348 | ||
fd2d231f | 1349 | static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) |
d1f96423 | 1350 | { |
d1f96423 MB |
1351 | unsigned i; |
1352 | int err; | |
1353 | ||
fd2d231f MP |
1354 | cc->tfms = kmalloc(cc->tfms_count * sizeof(struct crypto_ablkcipher *), |
1355 | GFP_KERNEL); | |
1356 | if (!cc->tfms) | |
1357 | return -ENOMEM; | |
1358 | ||
d1f96423 | 1359 | for (i = 0; i < cc->tfms_count; i++) { |
fd2d231f MP |
1360 | cc->tfms[i] = crypto_alloc_ablkcipher(ciphermode, 0, 0); |
1361 | if (IS_ERR(cc->tfms[i])) { | |
1362 | err = PTR_ERR(cc->tfms[i]); | |
1363 | crypt_free_tfms(cc); | |
d1f96423 MB |
1364 | return err; |
1365 | } | |
1366 | } | |
1367 | ||
1368 | return 0; | |
1369 | } | |
1370 | ||
c0297721 AK |
1371 | static int crypt_setkey_allcpus(struct crypt_config *cc) |
1372 | { | |
da31a078 | 1373 | unsigned subkey_size; |
fd2d231f MP |
1374 | int err = 0, i, r; |
1375 | ||
da31a078 MB |
1376 | /* Ignore extra keys (which are used for IV etc) */ |
1377 | subkey_size = (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); | |
1378 | ||
fd2d231f MP |
1379 | for (i = 0; i < cc->tfms_count; i++) { |
1380 | r = crypto_ablkcipher_setkey(cc->tfms[i], | |
1381 | cc->key + (i * subkey_size), | |
1382 | subkey_size); | |
1383 | if (r) | |
1384 | err = r; | |
c0297721 AK |
1385 | } |
1386 | ||
1387 | return err; | |
1388 | } | |
1389 | ||
e48d4bbf MB |
1390 | static int crypt_set_key(struct crypt_config *cc, char *key) |
1391 | { | |
de8be5ac MB |
1392 | int r = -EINVAL; |
1393 | int key_string_len = strlen(key); | |
1394 | ||
69a8cfcd | 1395 | /* The key size may not be changed. */ |
de8be5ac MB |
1396 | if (cc->key_size != (key_string_len >> 1)) |
1397 | goto out; | |
e48d4bbf | 1398 | |
69a8cfcd MB |
1399 | /* Hyphen (which gives a key_size of zero) means there is no key. */ |
1400 | if (!cc->key_size && strcmp(key, "-")) | |
de8be5ac | 1401 | goto out; |
e48d4bbf | 1402 | |
69a8cfcd | 1403 | if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0) |
de8be5ac | 1404 | goto out; |
e48d4bbf MB |
1405 | |
1406 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1407 | ||
de8be5ac MB |
1408 | r = crypt_setkey_allcpus(cc); |
1409 | ||
1410 | out: | |
1411 | /* Hex key string not needed after here, so wipe it. */ | |
1412 | memset(key, '0', key_string_len); | |
1413 | ||
1414 | return r; | |
e48d4bbf MB |
1415 | } |
1416 | ||
1417 | static int crypt_wipe_key(struct crypt_config *cc) | |
1418 | { | |
1419 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1420 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); | |
c0297721 AK |
1421 | |
1422 | return crypt_setkey_allcpus(cc); | |
e48d4bbf MB |
1423 | } |
1424 | ||
28513fcc MB |
1425 | static void crypt_dtr(struct dm_target *ti) |
1426 | { | |
1427 | struct crypt_config *cc = ti->private; | |
1428 | ||
1429 | ti->private = NULL; | |
1430 | ||
1431 | if (!cc) | |
1432 | return; | |
1433 | ||
1434 | if (cc->io_queue) | |
1435 | destroy_workqueue(cc->io_queue); | |
1436 | if (cc->crypt_queue) | |
1437 | destroy_workqueue(cc->crypt_queue); | |
1438 | ||
fd2d231f MP |
1439 | crypt_free_tfms(cc); |
1440 | ||
28513fcc MB |
1441 | if (cc->bs) |
1442 | bioset_free(cc->bs); | |
1443 | ||
1444 | if (cc->page_pool) | |
1445 | mempool_destroy(cc->page_pool); | |
1446 | if (cc->req_pool) | |
1447 | mempool_destroy(cc->req_pool); | |
1448 | if (cc->io_pool) | |
1449 | mempool_destroy(cc->io_pool); | |
1450 | ||
1451 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) | |
1452 | cc->iv_gen_ops->dtr(cc); | |
1453 | ||
28513fcc MB |
1454 | if (cc->dev) |
1455 | dm_put_device(ti, cc->dev); | |
1456 | ||
5ebaee6d | 1457 | kzfree(cc->cipher); |
7dbcd137 | 1458 | kzfree(cc->cipher_string); |
28513fcc MB |
1459 | |
1460 | /* Must zero key material before freeing */ | |
1461 | kzfree(cc); | |
1462 | } | |
1463 | ||
5ebaee6d MB |
1464 | static int crypt_ctr_cipher(struct dm_target *ti, |
1465 | char *cipher_in, char *key) | |
1da177e4 | 1466 | { |
5ebaee6d | 1467 | struct crypt_config *cc = ti->private; |
d1f96423 | 1468 | char *tmp, *cipher, *chainmode, *ivmode, *ivopts, *keycount; |
5ebaee6d | 1469 | char *cipher_api = NULL; |
fd2d231f | 1470 | int ret = -EINVAL; |
31998ef1 | 1471 | char dummy; |
1da177e4 | 1472 | |
5ebaee6d MB |
1473 | /* Convert to crypto api definition? */ |
1474 | if (strchr(cipher_in, '(')) { | |
1475 | ti->error = "Bad cipher specification"; | |
1da177e4 LT |
1476 | return -EINVAL; |
1477 | } | |
1478 | ||
7dbcd137 MB |
1479 | cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); |
1480 | if (!cc->cipher_string) | |
1481 | goto bad_mem; | |
1482 | ||
5ebaee6d MB |
1483 | /* |
1484 | * Legacy dm-crypt cipher specification | |
d1f96423 | 1485 | * cipher[:keycount]-mode-iv:ivopts |
5ebaee6d MB |
1486 | */ |
1487 | tmp = cipher_in; | |
d1f96423 MB |
1488 | keycount = strsep(&tmp, "-"); |
1489 | cipher = strsep(&keycount, ":"); | |
1490 | ||
1491 | if (!keycount) | |
1492 | cc->tfms_count = 1; | |
31998ef1 | 1493 | else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || |
d1f96423 MB |
1494 | !is_power_of_2(cc->tfms_count)) { |
1495 | ti->error = "Bad cipher key count specification"; | |
1496 | return -EINVAL; | |
1497 | } | |
1498 | cc->key_parts = cc->tfms_count; | |
da31a078 | 1499 | cc->key_extra_size = 0; |
5ebaee6d MB |
1500 | |
1501 | cc->cipher = kstrdup(cipher, GFP_KERNEL); | |
1502 | if (!cc->cipher) | |
1503 | goto bad_mem; | |
1504 | ||
1da177e4 LT |
1505 | chainmode = strsep(&tmp, "-"); |
1506 | ivopts = strsep(&tmp, "-"); | |
1507 | ivmode = strsep(&ivopts, ":"); | |
1508 | ||
1509 | if (tmp) | |
5ebaee6d | 1510 | DMWARN("Ignoring unexpected additional cipher options"); |
1da177e4 | 1511 | |
7dbcd137 MB |
1512 | /* |
1513 | * For compatibility with the original dm-crypt mapping format, if | |
1514 | * only the cipher name is supplied, use cbc-plain. | |
1515 | */ | |
5ebaee6d | 1516 | if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) { |
1da177e4 LT |
1517 | chainmode = "cbc"; |
1518 | ivmode = "plain"; | |
1519 | } | |
1520 | ||
d1806f6a | 1521 | if (strcmp(chainmode, "ecb") && !ivmode) { |
5ebaee6d MB |
1522 | ti->error = "IV mechanism required"; |
1523 | return -EINVAL; | |
1da177e4 LT |
1524 | } |
1525 | ||
5ebaee6d MB |
1526 | cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); |
1527 | if (!cipher_api) | |
1528 | goto bad_mem; | |
1529 | ||
1530 | ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, | |
1531 | "%s(%s)", chainmode, cipher); | |
1532 | if (ret < 0) { | |
1533 | kfree(cipher_api); | |
1534 | goto bad_mem; | |
1da177e4 LT |
1535 | } |
1536 | ||
5ebaee6d | 1537 | /* Allocate cipher */ |
fd2d231f MP |
1538 | ret = crypt_alloc_tfms(cc, cipher_api); |
1539 | if (ret < 0) { | |
1540 | ti->error = "Error allocating crypto tfm"; | |
1541 | goto bad; | |
1da177e4 | 1542 | } |
1da177e4 | 1543 | |
5ebaee6d | 1544 | /* Initialize IV */ |
c0297721 | 1545 | cc->iv_size = crypto_ablkcipher_ivsize(any_tfm(cc)); |
5ebaee6d MB |
1546 | if (cc->iv_size) |
1547 | /* at least a 64 bit sector number should fit in our buffer */ | |
1548 | cc->iv_size = max(cc->iv_size, | |
1549 | (unsigned int)(sizeof(u64) / sizeof(u8))); | |
1550 | else if (ivmode) { | |
1551 | DMWARN("Selected cipher does not support IVs"); | |
1552 | ivmode = NULL; | |
1553 | } | |
1554 | ||
1555 | /* Choose ivmode, see comments at iv code. */ | |
1da177e4 LT |
1556 | if (ivmode == NULL) |
1557 | cc->iv_gen_ops = NULL; | |
1558 | else if (strcmp(ivmode, "plain") == 0) | |
1559 | cc->iv_gen_ops = &crypt_iv_plain_ops; | |
61afef61 MB |
1560 | else if (strcmp(ivmode, "plain64") == 0) |
1561 | cc->iv_gen_ops = &crypt_iv_plain64_ops; | |
1da177e4 LT |
1562 | else if (strcmp(ivmode, "essiv") == 0) |
1563 | cc->iv_gen_ops = &crypt_iv_essiv_ops; | |
48527fa7 RS |
1564 | else if (strcmp(ivmode, "benbi") == 0) |
1565 | cc->iv_gen_ops = &crypt_iv_benbi_ops; | |
46b47730 LN |
1566 | else if (strcmp(ivmode, "null") == 0) |
1567 | cc->iv_gen_ops = &crypt_iv_null_ops; | |
34745785 MB |
1568 | else if (strcmp(ivmode, "lmk") == 0) { |
1569 | cc->iv_gen_ops = &crypt_iv_lmk_ops; | |
ed04d981 MB |
1570 | /* |
1571 | * Version 2 and 3 is recognised according | |
34745785 MB |
1572 | * to length of provided multi-key string. |
1573 | * If present (version 3), last key is used as IV seed. | |
ed04d981 | 1574 | * All keys (including IV seed) are always the same size. |
34745785 | 1575 | */ |
da31a078 | 1576 | if (cc->key_size % cc->key_parts) { |
34745785 | 1577 | cc->key_parts++; |
da31a078 MB |
1578 | cc->key_extra_size = cc->key_size / cc->key_parts; |
1579 | } | |
ed04d981 MB |
1580 | } else if (strcmp(ivmode, "tcw") == 0) { |
1581 | cc->iv_gen_ops = &crypt_iv_tcw_ops; | |
1582 | cc->key_parts += 2; /* IV + whitening */ | |
1583 | cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; | |
34745785 | 1584 | } else { |
5ebaee6d | 1585 | ret = -EINVAL; |
72d94861 | 1586 | ti->error = "Invalid IV mode"; |
28513fcc | 1587 | goto bad; |
1da177e4 LT |
1588 | } |
1589 | ||
da31a078 MB |
1590 | /* Initialize and set key */ |
1591 | ret = crypt_set_key(cc, key); | |
1592 | if (ret < 0) { | |
1593 | ti->error = "Error decoding and setting key"; | |
1594 | goto bad; | |
1595 | } | |
1596 | ||
28513fcc MB |
1597 | /* Allocate IV */ |
1598 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { | |
1599 | ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); | |
1600 | if (ret < 0) { | |
1601 | ti->error = "Error creating IV"; | |
1602 | goto bad; | |
1603 | } | |
1604 | } | |
1da177e4 | 1605 | |
28513fcc MB |
1606 | /* Initialize IV (set keys for ESSIV etc) */ |
1607 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) { | |
1608 | ret = cc->iv_gen_ops->init(cc); | |
1609 | if (ret < 0) { | |
1610 | ti->error = "Error initialising IV"; | |
1611 | goto bad; | |
1612 | } | |
b95bf2d3 MB |
1613 | } |
1614 | ||
5ebaee6d MB |
1615 | ret = 0; |
1616 | bad: | |
1617 | kfree(cipher_api); | |
1618 | return ret; | |
1619 | ||
1620 | bad_mem: | |
1621 | ti->error = "Cannot allocate cipher strings"; | |
1622 | return -ENOMEM; | |
1623 | } | |
1624 | ||
1625 | /* | |
1626 | * Construct an encryption mapping: | |
1627 | * <cipher> <key> <iv_offset> <dev_path> <start> | |
1628 | */ | |
1629 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
1630 | { | |
1631 | struct crypt_config *cc; | |
772ae5f5 | 1632 | unsigned int key_size, opt_params; |
5ebaee6d MB |
1633 | unsigned long long tmpll; |
1634 | int ret; | |
d49ec52f | 1635 | size_t iv_size_padding; |
772ae5f5 MB |
1636 | struct dm_arg_set as; |
1637 | const char *opt_string; | |
31998ef1 | 1638 | char dummy; |
772ae5f5 MB |
1639 | |
1640 | static struct dm_arg _args[] = { | |
f3396c58 | 1641 | {0, 2, "Invalid number of feature args"}, |
772ae5f5 | 1642 | }; |
5ebaee6d | 1643 | |
772ae5f5 | 1644 | if (argc < 5) { |
5ebaee6d MB |
1645 | ti->error = "Not enough arguments"; |
1646 | return -EINVAL; | |
1da177e4 LT |
1647 | } |
1648 | ||
5ebaee6d MB |
1649 | key_size = strlen(argv[1]) >> 1; |
1650 | ||
1651 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); | |
1652 | if (!cc) { | |
1653 | ti->error = "Cannot allocate encryption context"; | |
1654 | return -ENOMEM; | |
1655 | } | |
69a8cfcd | 1656 | cc->key_size = key_size; |
5ebaee6d MB |
1657 | |
1658 | ti->private = cc; | |
1659 | ret = crypt_ctr_cipher(ti, argv[0], argv[1]); | |
1660 | if (ret < 0) | |
1661 | goto bad; | |
1662 | ||
28513fcc | 1663 | ret = -ENOMEM; |
93d2341c | 1664 | cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool); |
1da177e4 | 1665 | if (!cc->io_pool) { |
72d94861 | 1666 | ti->error = "Cannot allocate crypt io mempool"; |
28513fcc | 1667 | goto bad; |
1da177e4 LT |
1668 | } |
1669 | ||
ddd42edf | 1670 | cc->dmreq_start = sizeof(struct ablkcipher_request); |
c0297721 | 1671 | cc->dmreq_start += crypto_ablkcipher_reqsize(any_tfm(cc)); |
d49ec52f MP |
1672 | cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request)); |
1673 | ||
1674 | if (crypto_ablkcipher_alignmask(any_tfm(cc)) < CRYPTO_MINALIGN) { | |
1675 | /* Allocate the padding exactly */ | |
1676 | iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request)) | |
1677 | & crypto_ablkcipher_alignmask(any_tfm(cc)); | |
1678 | } else { | |
1679 | /* | |
1680 | * If the cipher requires greater alignment than kmalloc | |
1681 | * alignment, we don't know the exact position of the | |
1682 | * initialization vector. We must assume worst case. | |
1683 | */ | |
1684 | iv_size_padding = crypto_ablkcipher_alignmask(any_tfm(cc)); | |
1685 | } | |
ddd42edf MB |
1686 | |
1687 | cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + | |
d49ec52f | 1688 | sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size); |
ddd42edf MB |
1689 | if (!cc->req_pool) { |
1690 | ti->error = "Cannot allocate crypt request mempool"; | |
28513fcc | 1691 | goto bad; |
ddd42edf | 1692 | } |
ddd42edf | 1693 | |
298a9fa0 | 1694 | cc->per_bio_data_size = ti->per_bio_data_size = |
d49ec52f MP |
1695 | ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + |
1696 | sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size, | |
1697 | ARCH_KMALLOC_MINALIGN); | |
298a9fa0 | 1698 | |
cf2f1abf | 1699 | cc->page_pool = mempool_create_page_pool(BIO_MAX_PAGES, 0); |
1da177e4 | 1700 | if (!cc->page_pool) { |
72d94861 | 1701 | ti->error = "Cannot allocate page mempool"; |
28513fcc | 1702 | goto bad; |
1da177e4 LT |
1703 | } |
1704 | ||
bb799ca0 | 1705 | cc->bs = bioset_create(MIN_IOS, 0); |
6a24c718 MB |
1706 | if (!cc->bs) { |
1707 | ti->error = "Cannot allocate crypt bioset"; | |
28513fcc | 1708 | goto bad; |
6a24c718 MB |
1709 | } |
1710 | ||
7145c241 MP |
1711 | mutex_init(&cc->bio_alloc_lock); |
1712 | ||
28513fcc | 1713 | ret = -EINVAL; |
31998ef1 | 1714 | if (sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1715 | ti->error = "Invalid iv_offset sector"; |
28513fcc | 1716 | goto bad; |
1da177e4 | 1717 | } |
4ee218cd | 1718 | cc->iv_offset = tmpll; |
1da177e4 | 1719 | |
28513fcc MB |
1720 | if (dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev)) { |
1721 | ti->error = "Device lookup failed"; | |
1722 | goto bad; | |
1723 | } | |
1724 | ||
31998ef1 | 1725 | if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1726 | ti->error = "Invalid device sector"; |
28513fcc | 1727 | goto bad; |
1da177e4 | 1728 | } |
4ee218cd | 1729 | cc->start = tmpll; |
1da177e4 | 1730 | |
772ae5f5 MB |
1731 | argv += 5; |
1732 | argc -= 5; | |
1733 | ||
1734 | /* Optional parameters */ | |
1735 | if (argc) { | |
1736 | as.argc = argc; | |
1737 | as.argv = argv; | |
1738 | ||
1739 | ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); | |
1740 | if (ret) | |
1741 | goto bad; | |
1742 | ||
f3396c58 MP |
1743 | while (opt_params--) { |
1744 | opt_string = dm_shift_arg(&as); | |
1745 | if (!opt_string) { | |
1746 | ti->error = "Not enough feature arguments"; | |
1747 | goto bad; | |
1748 | } | |
772ae5f5 | 1749 | |
f3396c58 MP |
1750 | if (!strcasecmp(opt_string, "allow_discards")) |
1751 | ti->num_discard_bios = 1; | |
1752 | ||
1753 | else if (!strcasecmp(opt_string, "same_cpu_crypt")) | |
1754 | set_bit(DM_CRYPT_SAME_CPU, &cc->flags); | |
1755 | ||
1756 | else { | |
1757 | ti->error = "Invalid feature arguments"; | |
1758 | goto bad; | |
1759 | } | |
772ae5f5 MB |
1760 | } |
1761 | } | |
1762 | ||
28513fcc | 1763 | ret = -ENOMEM; |
670368a8 | 1764 | cc->io_queue = alloc_workqueue("kcryptd_io", WQ_MEM_RECLAIM, 1); |
cabf08e4 MB |
1765 | if (!cc->io_queue) { |
1766 | ti->error = "Couldn't create kcryptd io queue"; | |
28513fcc | 1767 | goto bad; |
cabf08e4 MB |
1768 | } |
1769 | ||
f3396c58 MP |
1770 | if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) |
1771 | cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1); | |
1772 | else | |
1773 | cc->crypt_queue = alloc_workqueue("kcryptd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND, | |
1774 | num_online_cpus()); | |
cabf08e4 | 1775 | if (!cc->crypt_queue) { |
9934a8be | 1776 | ti->error = "Couldn't create kcryptd queue"; |
28513fcc | 1777 | goto bad; |
9934a8be MB |
1778 | } |
1779 | ||
55a62eef | 1780 | ti->num_flush_bios = 1; |
0ac55489 | 1781 | ti->discard_zeroes_data_unsupported = true; |
983c7db3 | 1782 | |
1da177e4 LT |
1783 | return 0; |
1784 | ||
28513fcc MB |
1785 | bad: |
1786 | crypt_dtr(ti); | |
1787 | return ret; | |
1da177e4 LT |
1788 | } |
1789 | ||
7de3ee57 | 1790 | static int crypt_map(struct dm_target *ti, struct bio *bio) |
1da177e4 | 1791 | { |
028867ac | 1792 | struct dm_crypt_io *io; |
49a8a920 | 1793 | struct crypt_config *cc = ti->private; |
647c7db1 | 1794 | |
772ae5f5 MB |
1795 | /* |
1796 | * If bio is REQ_FLUSH or REQ_DISCARD, just bypass crypt queues. | |
1797 | * - for REQ_FLUSH device-mapper core ensures that no IO is in-flight | |
1798 | * - for REQ_DISCARD caller must use flush if IO ordering matters | |
1799 | */ | |
1800 | if (unlikely(bio->bi_rw & (REQ_FLUSH | REQ_DISCARD))) { | |
647c7db1 | 1801 | bio->bi_bdev = cc->dev->bdev; |
772ae5f5 | 1802 | if (bio_sectors(bio)) |
4f024f37 KO |
1803 | bio->bi_iter.bi_sector = cc->start + |
1804 | dm_target_offset(ti, bio->bi_iter.bi_sector); | |
647c7db1 MP |
1805 | return DM_MAPIO_REMAPPED; |
1806 | } | |
1da177e4 | 1807 | |
298a9fa0 MP |
1808 | io = dm_per_bio_data(bio, cc->per_bio_data_size); |
1809 | crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector)); | |
1810 | io->ctx.req = (struct ablkcipher_request *)(io + 1); | |
cabf08e4 | 1811 | |
20c82538 MB |
1812 | if (bio_data_dir(io->base_bio) == READ) { |
1813 | if (kcryptd_io_read(io, GFP_NOWAIT)) | |
1814 | kcryptd_queue_io(io); | |
1815 | } else | |
cabf08e4 | 1816 | kcryptd_queue_crypt(io); |
1da177e4 | 1817 | |
d2a7ad29 | 1818 | return DM_MAPIO_SUBMITTED; |
1da177e4 LT |
1819 | } |
1820 | ||
fd7c092e MP |
1821 | static void crypt_status(struct dm_target *ti, status_type_t type, |
1822 | unsigned status_flags, char *result, unsigned maxlen) | |
1da177e4 | 1823 | { |
5ebaee6d | 1824 | struct crypt_config *cc = ti->private; |
fd7c092e | 1825 | unsigned i, sz = 0; |
f3396c58 | 1826 | int num_feature_args = 0; |
1da177e4 LT |
1827 | |
1828 | switch (type) { | |
1829 | case STATUSTYPE_INFO: | |
1830 | result[0] = '\0'; | |
1831 | break; | |
1832 | ||
1833 | case STATUSTYPE_TABLE: | |
7dbcd137 | 1834 | DMEMIT("%s ", cc->cipher_string); |
1da177e4 | 1835 | |
fd7c092e MP |
1836 | if (cc->key_size > 0) |
1837 | for (i = 0; i < cc->key_size; i++) | |
1838 | DMEMIT("%02x", cc->key[i]); | |
1839 | else | |
1840 | DMEMIT("-"); | |
1da177e4 | 1841 | |
4ee218cd AM |
1842 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
1843 | cc->dev->name, (unsigned long long)cc->start); | |
772ae5f5 | 1844 | |
f3396c58 MP |
1845 | num_feature_args += !!ti->num_discard_bios; |
1846 | num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags); | |
1847 | if (num_feature_args) { | |
1848 | DMEMIT(" %d", num_feature_args); | |
1849 | if (ti->num_discard_bios) | |
1850 | DMEMIT(" allow_discards"); | |
1851 | if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags)) | |
1852 | DMEMIT(" same_cpu_crypt"); | |
1853 | } | |
772ae5f5 | 1854 | |
1da177e4 LT |
1855 | break; |
1856 | } | |
1da177e4 LT |
1857 | } |
1858 | ||
e48d4bbf MB |
1859 | static void crypt_postsuspend(struct dm_target *ti) |
1860 | { | |
1861 | struct crypt_config *cc = ti->private; | |
1862 | ||
1863 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1864 | } | |
1865 | ||
1866 | static int crypt_preresume(struct dm_target *ti) | |
1867 | { | |
1868 | struct crypt_config *cc = ti->private; | |
1869 | ||
1870 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { | |
1871 | DMERR("aborting resume - crypt key is not set."); | |
1872 | return -EAGAIN; | |
1873 | } | |
1874 | ||
1875 | return 0; | |
1876 | } | |
1877 | ||
1878 | static void crypt_resume(struct dm_target *ti) | |
1879 | { | |
1880 | struct crypt_config *cc = ti->private; | |
1881 | ||
1882 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1883 | } | |
1884 | ||
1885 | /* Message interface | |
1886 | * key set <key> | |
1887 | * key wipe | |
1888 | */ | |
1889 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) | |
1890 | { | |
1891 | struct crypt_config *cc = ti->private; | |
542da317 | 1892 | int ret = -EINVAL; |
e48d4bbf MB |
1893 | |
1894 | if (argc < 2) | |
1895 | goto error; | |
1896 | ||
498f0103 | 1897 | if (!strcasecmp(argv[0], "key")) { |
e48d4bbf MB |
1898 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { |
1899 | DMWARN("not suspended during key manipulation."); | |
1900 | return -EINVAL; | |
1901 | } | |
498f0103 | 1902 | if (argc == 3 && !strcasecmp(argv[1], "set")) { |
542da317 MB |
1903 | ret = crypt_set_key(cc, argv[2]); |
1904 | if (ret) | |
1905 | return ret; | |
1906 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) | |
1907 | ret = cc->iv_gen_ops->init(cc); | |
1908 | return ret; | |
1909 | } | |
498f0103 | 1910 | if (argc == 2 && !strcasecmp(argv[1], "wipe")) { |
542da317 MB |
1911 | if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { |
1912 | ret = cc->iv_gen_ops->wipe(cc); | |
1913 | if (ret) | |
1914 | return ret; | |
1915 | } | |
e48d4bbf | 1916 | return crypt_wipe_key(cc); |
542da317 | 1917 | } |
e48d4bbf MB |
1918 | } |
1919 | ||
1920 | error: | |
1921 | DMWARN("unrecognised message received."); | |
1922 | return -EINVAL; | |
1923 | } | |
1924 | ||
d41e26b9 MB |
1925 | static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm, |
1926 | struct bio_vec *biovec, int max_size) | |
1927 | { | |
1928 | struct crypt_config *cc = ti->private; | |
1929 | struct request_queue *q = bdev_get_queue(cc->dev->bdev); | |
1930 | ||
1931 | if (!q->merge_bvec_fn) | |
1932 | return max_size; | |
1933 | ||
1934 | bvm->bi_bdev = cc->dev->bdev; | |
b441a262 | 1935 | bvm->bi_sector = cc->start + dm_target_offset(ti, bvm->bi_sector); |
d41e26b9 MB |
1936 | |
1937 | return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); | |
1938 | } | |
1939 | ||
af4874e0 MS |
1940 | static int crypt_iterate_devices(struct dm_target *ti, |
1941 | iterate_devices_callout_fn fn, void *data) | |
1942 | { | |
1943 | struct crypt_config *cc = ti->private; | |
1944 | ||
5dea271b | 1945 | return fn(ti, cc->dev, cc->start, ti->len, data); |
af4874e0 MS |
1946 | } |
1947 | ||
1da177e4 LT |
1948 | static struct target_type crypt_target = { |
1949 | .name = "crypt", | |
f3396c58 | 1950 | .version = {1, 14, 0}, |
1da177e4 LT |
1951 | .module = THIS_MODULE, |
1952 | .ctr = crypt_ctr, | |
1953 | .dtr = crypt_dtr, | |
1954 | .map = crypt_map, | |
1955 | .status = crypt_status, | |
e48d4bbf MB |
1956 | .postsuspend = crypt_postsuspend, |
1957 | .preresume = crypt_preresume, | |
1958 | .resume = crypt_resume, | |
1959 | .message = crypt_message, | |
d41e26b9 | 1960 | .merge = crypt_merge, |
af4874e0 | 1961 | .iterate_devices = crypt_iterate_devices, |
1da177e4 LT |
1962 | }; |
1963 | ||
1964 | static int __init dm_crypt_init(void) | |
1965 | { | |
1966 | int r; | |
1967 | ||
028867ac | 1968 | _crypt_io_pool = KMEM_CACHE(dm_crypt_io, 0); |
1da177e4 LT |
1969 | if (!_crypt_io_pool) |
1970 | return -ENOMEM; | |
1971 | ||
1da177e4 LT |
1972 | r = dm_register_target(&crypt_target); |
1973 | if (r < 0) { | |
72d94861 | 1974 | DMERR("register failed %d", r); |
9934a8be | 1975 | kmem_cache_destroy(_crypt_io_pool); |
1da177e4 LT |
1976 | } |
1977 | ||
1da177e4 LT |
1978 | return r; |
1979 | } | |
1980 | ||
1981 | static void __exit dm_crypt_exit(void) | |
1982 | { | |
10d3bd09 | 1983 | dm_unregister_target(&crypt_target); |
1da177e4 LT |
1984 | kmem_cache_destroy(_crypt_io_pool); |
1985 | } | |
1986 | ||
1987 | module_init(dm_crypt_init); | |
1988 | module_exit(dm_crypt_exit); | |
1989 | ||
bf14299f | 1990 | MODULE_AUTHOR("Jana Saout <jana@saout.de>"); |
1da177e4 LT |
1991 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); |
1992 | MODULE_LICENSE("GPL"); |