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> |
c0297721 | 22 | #include <linux/percpu.h> |
60063497 | 23 | #include <linux/atomic.h> |
378f058c | 24 | #include <linux/scatterlist.h> |
1da177e4 | 25 | #include <asm/page.h> |
48527fa7 | 26 | #include <asm/unaligned.h> |
34745785 MB |
27 | #include <crypto/hash.h> |
28 | #include <crypto/md5.h> | |
29 | #include <crypto/algapi.h> | |
1da177e4 | 30 | |
586e80e6 | 31 | #include <linux/device-mapper.h> |
1da177e4 | 32 | |
72d94861 | 33 | #define DM_MSG_PREFIX "crypt" |
1da177e4 | 34 | |
1da177e4 LT |
35 | /* |
36 | * context holding the current state of a multi-part conversion | |
37 | */ | |
38 | struct convert_context { | |
43d69034 | 39 | struct completion restart; |
1da177e4 LT |
40 | struct bio *bio_in; |
41 | struct bio *bio_out; | |
42 | unsigned int offset_in; | |
43 | unsigned int offset_out; | |
44 | unsigned int idx_in; | |
45 | unsigned int idx_out; | |
c66029f4 | 46 | sector_t cc_sector; |
40b6229b | 47 | atomic_t cc_pending; |
1da177e4 LT |
48 | }; |
49 | ||
53017030 MB |
50 | /* |
51 | * per bio private data | |
52 | */ | |
53 | struct dm_crypt_io { | |
49a8a920 | 54 | struct crypt_config *cc; |
53017030 MB |
55 | struct bio *base_bio; |
56 | struct work_struct work; | |
57 | ||
58 | struct convert_context ctx; | |
59 | ||
40b6229b | 60 | atomic_t io_pending; |
53017030 | 61 | int error; |
0c395b0f | 62 | sector_t sector; |
393b47ef | 63 | struct dm_crypt_io *base_io; |
53017030 MB |
64 | }; |
65 | ||
01482b76 | 66 | struct dm_crypt_request { |
b2174eeb | 67 | struct convert_context *ctx; |
01482b76 MB |
68 | struct scatterlist sg_in; |
69 | struct scatterlist sg_out; | |
2dc5327d | 70 | sector_t iv_sector; |
01482b76 MB |
71 | }; |
72 | ||
1da177e4 LT |
73 | struct crypt_config; |
74 | ||
75 | struct crypt_iv_operations { | |
76 | int (*ctr)(struct crypt_config *cc, struct dm_target *ti, | |
d469f841 | 77 | const char *opts); |
1da177e4 | 78 | void (*dtr)(struct crypt_config *cc); |
b95bf2d3 | 79 | int (*init)(struct crypt_config *cc); |
542da317 | 80 | int (*wipe)(struct crypt_config *cc); |
2dc5327d MB |
81 | int (*generator)(struct crypt_config *cc, u8 *iv, |
82 | struct dm_crypt_request *dmreq); | |
83 | int (*post)(struct crypt_config *cc, u8 *iv, | |
84 | struct dm_crypt_request *dmreq); | |
1da177e4 LT |
85 | }; |
86 | ||
60473592 | 87 | struct iv_essiv_private { |
b95bf2d3 MB |
88 | struct crypto_hash *hash_tfm; |
89 | u8 *salt; | |
60473592 MB |
90 | }; |
91 | ||
92 | struct iv_benbi_private { | |
93 | int shift; | |
94 | }; | |
95 | ||
34745785 MB |
96 | #define LMK_SEED_SIZE 64 /* hash + 0 */ |
97 | struct iv_lmk_private { | |
98 | struct crypto_shash *hash_tfm; | |
99 | u8 *seed; | |
100 | }; | |
101 | ||
ed04d981 MB |
102 | #define TCW_WHITENING_SIZE 16 |
103 | struct iv_tcw_private { | |
104 | struct crypto_shash *crc32_tfm; | |
105 | u8 *iv_seed; | |
106 | u8 *whitening; | |
107 | }; | |
108 | ||
1da177e4 LT |
109 | /* |
110 | * Crypt: maps a linear range of a block device | |
111 | * and encrypts / decrypts at the same time. | |
112 | */ | |
e48d4bbf | 113 | enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID }; |
c0297721 AK |
114 | |
115 | /* | |
116 | * Duplicated per-CPU state for cipher. | |
117 | */ | |
118 | struct crypt_cpu { | |
119 | struct ablkcipher_request *req; | |
c0297721 AK |
120 | }; |
121 | ||
122 | /* | |
123 | * The fields in here must be read only after initialization, | |
124 | * changing state should be in crypt_cpu. | |
125 | */ | |
1da177e4 LT |
126 | struct crypt_config { |
127 | struct dm_dev *dev; | |
128 | sector_t start; | |
129 | ||
130 | /* | |
ddd42edf MB |
131 | * pool for per bio private data, crypto requests and |
132 | * encryption requeusts/buffer pages | |
1da177e4 LT |
133 | */ |
134 | mempool_t *io_pool; | |
ddd42edf | 135 | mempool_t *req_pool; |
1da177e4 | 136 | mempool_t *page_pool; |
6a24c718 | 137 | struct bio_set *bs; |
1da177e4 | 138 | |
cabf08e4 MB |
139 | struct workqueue_struct *io_queue; |
140 | struct workqueue_struct *crypt_queue; | |
3f1e9070 | 141 | |
5ebaee6d | 142 | char *cipher; |
7dbcd137 | 143 | char *cipher_string; |
5ebaee6d | 144 | |
1da177e4 | 145 | struct crypt_iv_operations *iv_gen_ops; |
79066ad3 | 146 | union { |
60473592 MB |
147 | struct iv_essiv_private essiv; |
148 | struct iv_benbi_private benbi; | |
34745785 | 149 | struct iv_lmk_private lmk; |
ed04d981 | 150 | struct iv_tcw_private tcw; |
79066ad3 | 151 | } iv_gen_private; |
1da177e4 LT |
152 | sector_t iv_offset; |
153 | unsigned int iv_size; | |
154 | ||
c0297721 AK |
155 | /* |
156 | * Duplicated per cpu state. Access through | |
157 | * per_cpu_ptr() only. | |
158 | */ | |
159 | struct crypt_cpu __percpu *cpu; | |
fd2d231f MP |
160 | |
161 | /* ESSIV: struct crypto_cipher *essiv_tfm */ | |
162 | void *iv_private; | |
163 | struct crypto_ablkcipher **tfms; | |
d1f96423 | 164 | unsigned tfms_count; |
c0297721 | 165 | |
ddd42edf MB |
166 | /* |
167 | * Layout of each crypto request: | |
168 | * | |
169 | * struct ablkcipher_request | |
170 | * context | |
171 | * padding | |
172 | * struct dm_crypt_request | |
173 | * padding | |
174 | * IV | |
175 | * | |
176 | * The padding is added so that dm_crypt_request and the IV are | |
177 | * correctly aligned. | |
178 | */ | |
179 | unsigned int dmreq_start; | |
ddd42edf | 180 | |
e48d4bbf | 181 | unsigned long flags; |
1da177e4 | 182 | unsigned int key_size; |
da31a078 MB |
183 | unsigned int key_parts; /* independent parts in key buffer */ |
184 | unsigned int key_extra_size; /* additional keys length */ | |
1da177e4 LT |
185 | u8 key[0]; |
186 | }; | |
187 | ||
6a24c718 | 188 | #define MIN_IOS 16 |
1da177e4 | 189 | #define MIN_POOL_PAGES 32 |
1da177e4 | 190 | |
e18b890b | 191 | static struct kmem_cache *_crypt_io_pool; |
1da177e4 | 192 | |
028867ac | 193 | static void clone_init(struct dm_crypt_io *, struct bio *); |
395b167c | 194 | static void kcryptd_queue_crypt(struct dm_crypt_io *io); |
2dc5327d | 195 | static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq); |
027581f3 | 196 | |
c0297721 AK |
197 | static struct crypt_cpu *this_crypt_config(struct crypt_config *cc) |
198 | { | |
199 | return this_cpu_ptr(cc->cpu); | |
200 | } | |
201 | ||
202 | /* | |
203 | * Use this to access cipher attributes that are the same for each CPU. | |
204 | */ | |
205 | static struct crypto_ablkcipher *any_tfm(struct crypt_config *cc) | |
206 | { | |
fd2d231f | 207 | return cc->tfms[0]; |
c0297721 AK |
208 | } |
209 | ||
1da177e4 LT |
210 | /* |
211 | * Different IV generation algorithms: | |
212 | * | |
3c164bd8 | 213 | * plain: the initial vector is the 32-bit little-endian version of the sector |
3a4fa0a2 | 214 | * number, padded with zeros if necessary. |
1da177e4 | 215 | * |
61afef61 MB |
216 | * plain64: the initial vector is the 64-bit little-endian version of the sector |
217 | * number, padded with zeros if necessary. | |
218 | * | |
3c164bd8 RS |
219 | * essiv: "encrypted sector|salt initial vector", the sector number is |
220 | * encrypted with the bulk cipher using a salt as key. The salt | |
221 | * should be derived from the bulk cipher's key via hashing. | |
1da177e4 | 222 | * |
48527fa7 RS |
223 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
224 | * (needed for LRW-32-AES and possible other narrow block modes) | |
225 | * | |
46b47730 LN |
226 | * null: the initial vector is always zero. Provides compatibility with |
227 | * obsolete loop_fish2 devices. Do not use for new devices. | |
228 | * | |
34745785 MB |
229 | * lmk: Compatible implementation of the block chaining mode used |
230 | * by the Loop-AES block device encryption system | |
231 | * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ | |
232 | * It operates on full 512 byte sectors and uses CBC | |
233 | * with an IV derived from the sector number, the data and | |
234 | * optionally extra IV seed. | |
235 | * This means that after decryption the first block | |
236 | * of sector must be tweaked according to decrypted data. | |
237 | * Loop-AES can use three encryption schemes: | |
238 | * version 1: is plain aes-cbc mode | |
239 | * version 2: uses 64 multikey scheme with lmk IV generator | |
240 | * version 3: the same as version 2 with additional IV seed | |
241 | * (it uses 65 keys, last key is used as IV seed) | |
242 | * | |
ed04d981 MB |
243 | * tcw: Compatible implementation of the block chaining mode used |
244 | * by the TrueCrypt device encryption system (prior to version 4.1). | |
245 | * For more info see: http://www.truecrypt.org | |
246 | * It operates on full 512 byte sectors and uses CBC | |
247 | * with an IV derived from initial key and the sector number. | |
248 | * In addition, whitening value is applied on every sector, whitening | |
249 | * is calculated from initial key, sector number and mixed using CRC32. | |
250 | * Note that this encryption scheme is vulnerable to watermarking attacks | |
251 | * and should be used for old compatible containers access only. | |
252 | * | |
1da177e4 LT |
253 | * plumb: unimplemented, see: |
254 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 | |
255 | */ | |
256 | ||
2dc5327d MB |
257 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, |
258 | struct dm_crypt_request *dmreq) | |
1da177e4 LT |
259 | { |
260 | memset(iv, 0, cc->iv_size); | |
283a8328 | 261 | *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); |
1da177e4 LT |
262 | |
263 | return 0; | |
264 | } | |
265 | ||
61afef61 | 266 | static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, |
2dc5327d | 267 | struct dm_crypt_request *dmreq) |
61afef61 MB |
268 | { |
269 | memset(iv, 0, cc->iv_size); | |
283a8328 | 270 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
61afef61 MB |
271 | |
272 | return 0; | |
273 | } | |
274 | ||
b95bf2d3 MB |
275 | /* Initialise ESSIV - compute salt but no local memory allocations */ |
276 | static int crypt_iv_essiv_init(struct crypt_config *cc) | |
277 | { | |
278 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
279 | struct hash_desc desc; | |
280 | struct scatterlist sg; | |
c0297721 | 281 | struct crypto_cipher *essiv_tfm; |
fd2d231f | 282 | int err; |
b95bf2d3 MB |
283 | |
284 | sg_init_one(&sg, cc->key, cc->key_size); | |
285 | desc.tfm = essiv->hash_tfm; | |
286 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
287 | ||
288 | err = crypto_hash_digest(&desc, &sg, cc->key_size, essiv->salt); | |
289 | if (err) | |
290 | return err; | |
291 | ||
fd2d231f | 292 | essiv_tfm = cc->iv_private; |
c0297721 | 293 | |
fd2d231f MP |
294 | err = crypto_cipher_setkey(essiv_tfm, essiv->salt, |
295 | crypto_hash_digestsize(essiv->hash_tfm)); | |
296 | if (err) | |
297 | return err; | |
c0297721 AK |
298 | |
299 | return 0; | |
b95bf2d3 MB |
300 | } |
301 | ||
542da317 MB |
302 | /* Wipe salt and reset key derived from volume key */ |
303 | static int crypt_iv_essiv_wipe(struct crypt_config *cc) | |
304 | { | |
305 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
306 | unsigned salt_size = crypto_hash_digestsize(essiv->hash_tfm); | |
c0297721 | 307 | struct crypto_cipher *essiv_tfm; |
fd2d231f | 308 | int r, err = 0; |
542da317 MB |
309 | |
310 | memset(essiv->salt, 0, salt_size); | |
311 | ||
fd2d231f MP |
312 | essiv_tfm = cc->iv_private; |
313 | r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size); | |
314 | if (r) | |
315 | err = r; | |
c0297721 AK |
316 | |
317 | return err; | |
318 | } | |
319 | ||
320 | /* Set up per cpu cipher state */ | |
321 | static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc, | |
322 | struct dm_target *ti, | |
323 | u8 *salt, unsigned saltsize) | |
324 | { | |
325 | struct crypto_cipher *essiv_tfm; | |
326 | int err; | |
327 | ||
328 | /* Setup the essiv_tfm with the given salt */ | |
329 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); | |
330 | if (IS_ERR(essiv_tfm)) { | |
331 | ti->error = "Error allocating crypto tfm for ESSIV"; | |
332 | return essiv_tfm; | |
333 | } | |
334 | ||
335 | if (crypto_cipher_blocksize(essiv_tfm) != | |
336 | crypto_ablkcipher_ivsize(any_tfm(cc))) { | |
337 | ti->error = "Block size of ESSIV cipher does " | |
338 | "not match IV size of block cipher"; | |
339 | crypto_free_cipher(essiv_tfm); | |
340 | return ERR_PTR(-EINVAL); | |
341 | } | |
342 | ||
343 | err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); | |
344 | if (err) { | |
345 | ti->error = "Failed to set key for ESSIV cipher"; | |
346 | crypto_free_cipher(essiv_tfm); | |
347 | return ERR_PTR(err); | |
348 | } | |
349 | ||
350 | return essiv_tfm; | |
542da317 MB |
351 | } |
352 | ||
60473592 MB |
353 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) |
354 | { | |
c0297721 | 355 | struct crypto_cipher *essiv_tfm; |
60473592 MB |
356 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; |
357 | ||
b95bf2d3 MB |
358 | crypto_free_hash(essiv->hash_tfm); |
359 | essiv->hash_tfm = NULL; | |
360 | ||
361 | kzfree(essiv->salt); | |
362 | essiv->salt = NULL; | |
c0297721 | 363 | |
fd2d231f | 364 | essiv_tfm = cc->iv_private; |
c0297721 | 365 | |
fd2d231f MP |
366 | if (essiv_tfm) |
367 | crypto_free_cipher(essiv_tfm); | |
c0297721 | 368 | |
fd2d231f | 369 | cc->iv_private = NULL; |
60473592 MB |
370 | } |
371 | ||
1da177e4 | 372 | static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, |
d469f841 | 373 | const char *opts) |
1da177e4 | 374 | { |
5861f1be MB |
375 | struct crypto_cipher *essiv_tfm = NULL; |
376 | struct crypto_hash *hash_tfm = NULL; | |
5861f1be | 377 | u8 *salt = NULL; |
fd2d231f | 378 | int err; |
1da177e4 | 379 | |
5861f1be | 380 | if (!opts) { |
72d94861 | 381 | ti->error = "Digest algorithm missing for ESSIV mode"; |
1da177e4 LT |
382 | return -EINVAL; |
383 | } | |
384 | ||
b95bf2d3 | 385 | /* Allocate hash algorithm */ |
35058687 HX |
386 | hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC); |
387 | if (IS_ERR(hash_tfm)) { | |
72d94861 | 388 | ti->error = "Error initializing ESSIV hash"; |
5861f1be MB |
389 | err = PTR_ERR(hash_tfm); |
390 | goto bad; | |
1da177e4 LT |
391 | } |
392 | ||
b95bf2d3 | 393 | salt = kzalloc(crypto_hash_digestsize(hash_tfm), GFP_KERNEL); |
5861f1be | 394 | if (!salt) { |
72d94861 | 395 | ti->error = "Error kmallocing salt storage in ESSIV"; |
5861f1be MB |
396 | err = -ENOMEM; |
397 | goto bad; | |
1da177e4 LT |
398 | } |
399 | ||
b95bf2d3 | 400 | cc->iv_gen_private.essiv.salt = salt; |
b95bf2d3 MB |
401 | cc->iv_gen_private.essiv.hash_tfm = hash_tfm; |
402 | ||
fd2d231f MP |
403 | essiv_tfm = setup_essiv_cpu(cc, ti, salt, |
404 | crypto_hash_digestsize(hash_tfm)); | |
405 | if (IS_ERR(essiv_tfm)) { | |
406 | crypt_iv_essiv_dtr(cc); | |
407 | return PTR_ERR(essiv_tfm); | |
c0297721 | 408 | } |
fd2d231f | 409 | cc->iv_private = essiv_tfm; |
c0297721 | 410 | |
1da177e4 | 411 | return 0; |
5861f1be MB |
412 | |
413 | bad: | |
5861f1be MB |
414 | if (hash_tfm && !IS_ERR(hash_tfm)) |
415 | crypto_free_hash(hash_tfm); | |
b95bf2d3 | 416 | kfree(salt); |
5861f1be | 417 | return err; |
1da177e4 LT |
418 | } |
419 | ||
2dc5327d MB |
420 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, |
421 | struct dm_crypt_request *dmreq) | |
1da177e4 | 422 | { |
fd2d231f | 423 | struct crypto_cipher *essiv_tfm = cc->iv_private; |
c0297721 | 424 | |
1da177e4 | 425 | memset(iv, 0, cc->iv_size); |
283a8328 | 426 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
c0297721 AK |
427 | crypto_cipher_encrypt_one(essiv_tfm, iv, iv); |
428 | ||
1da177e4 LT |
429 | return 0; |
430 | } | |
431 | ||
48527fa7 RS |
432 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
433 | const char *opts) | |
434 | { | |
c0297721 | 435 | unsigned bs = crypto_ablkcipher_blocksize(any_tfm(cc)); |
f0d1b0b3 | 436 | int log = ilog2(bs); |
48527fa7 RS |
437 | |
438 | /* we need to calculate how far we must shift the sector count | |
439 | * to get the cipher block count, we use this shift in _gen */ | |
440 | ||
441 | if (1 << log != bs) { | |
442 | ti->error = "cypher blocksize is not a power of 2"; | |
443 | return -EINVAL; | |
444 | } | |
445 | ||
446 | if (log > 9) { | |
447 | ti->error = "cypher blocksize is > 512"; | |
448 | return -EINVAL; | |
449 | } | |
450 | ||
60473592 | 451 | cc->iv_gen_private.benbi.shift = 9 - log; |
48527fa7 RS |
452 | |
453 | return 0; | |
454 | } | |
455 | ||
456 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) | |
457 | { | |
48527fa7 RS |
458 | } |
459 | ||
2dc5327d MB |
460 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, |
461 | struct dm_crypt_request *dmreq) | |
48527fa7 | 462 | { |
79066ad3 HX |
463 | __be64 val; |
464 | ||
48527fa7 | 465 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
79066ad3 | 466 | |
2dc5327d | 467 | val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); |
79066ad3 | 468 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); |
48527fa7 | 469 | |
1da177e4 LT |
470 | return 0; |
471 | } | |
472 | ||
2dc5327d MB |
473 | static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, |
474 | struct dm_crypt_request *dmreq) | |
46b47730 LN |
475 | { |
476 | memset(iv, 0, cc->iv_size); | |
477 | ||
478 | return 0; | |
479 | } | |
480 | ||
34745785 MB |
481 | static void crypt_iv_lmk_dtr(struct crypt_config *cc) |
482 | { | |
483 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
484 | ||
485 | if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) | |
486 | crypto_free_shash(lmk->hash_tfm); | |
487 | lmk->hash_tfm = NULL; | |
488 | ||
489 | kzfree(lmk->seed); | |
490 | lmk->seed = NULL; | |
491 | } | |
492 | ||
493 | static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, | |
494 | const char *opts) | |
495 | { | |
496 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
497 | ||
498 | lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0); | |
499 | if (IS_ERR(lmk->hash_tfm)) { | |
500 | ti->error = "Error initializing LMK hash"; | |
501 | return PTR_ERR(lmk->hash_tfm); | |
502 | } | |
503 | ||
504 | /* No seed in LMK version 2 */ | |
505 | if (cc->key_parts == cc->tfms_count) { | |
506 | lmk->seed = NULL; | |
507 | return 0; | |
508 | } | |
509 | ||
510 | lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); | |
511 | if (!lmk->seed) { | |
512 | crypt_iv_lmk_dtr(cc); | |
513 | ti->error = "Error kmallocing seed storage in LMK"; | |
514 | return -ENOMEM; | |
515 | } | |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
520 | static int crypt_iv_lmk_init(struct crypt_config *cc) | |
521 | { | |
522 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
523 | int subkey_size = cc->key_size / cc->key_parts; | |
524 | ||
525 | /* LMK seed is on the position of LMK_KEYS + 1 key */ | |
526 | if (lmk->seed) | |
527 | memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), | |
528 | crypto_shash_digestsize(lmk->hash_tfm)); | |
529 | ||
530 | return 0; | |
531 | } | |
532 | ||
533 | static int crypt_iv_lmk_wipe(struct crypt_config *cc) | |
534 | { | |
535 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
536 | ||
537 | if (lmk->seed) | |
538 | memset(lmk->seed, 0, LMK_SEED_SIZE); | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
543 | static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, | |
544 | struct dm_crypt_request *dmreq, | |
545 | u8 *data) | |
546 | { | |
547 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
548 | struct { | |
549 | struct shash_desc desc; | |
550 | char ctx[crypto_shash_descsize(lmk->hash_tfm)]; | |
551 | } sdesc; | |
552 | struct md5_state md5state; | |
da31a078 | 553 | __le32 buf[4]; |
34745785 MB |
554 | int i, r; |
555 | ||
556 | sdesc.desc.tfm = lmk->hash_tfm; | |
557 | sdesc.desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
558 | ||
559 | r = crypto_shash_init(&sdesc.desc); | |
560 | if (r) | |
561 | return r; | |
562 | ||
563 | if (lmk->seed) { | |
564 | r = crypto_shash_update(&sdesc.desc, lmk->seed, LMK_SEED_SIZE); | |
565 | if (r) | |
566 | return r; | |
567 | } | |
568 | ||
569 | /* Sector is always 512B, block size 16, add data of blocks 1-31 */ | |
570 | r = crypto_shash_update(&sdesc.desc, data + 16, 16 * 31); | |
571 | if (r) | |
572 | return r; | |
573 | ||
574 | /* Sector is cropped to 56 bits here */ | |
575 | buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); | |
576 | buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); | |
577 | buf[2] = cpu_to_le32(4024); | |
578 | buf[3] = 0; | |
579 | r = crypto_shash_update(&sdesc.desc, (u8 *)buf, sizeof(buf)); | |
580 | if (r) | |
581 | return r; | |
582 | ||
583 | /* No MD5 padding here */ | |
584 | r = crypto_shash_export(&sdesc.desc, &md5state); | |
585 | if (r) | |
586 | return r; | |
587 | ||
588 | for (i = 0; i < MD5_HASH_WORDS; i++) | |
589 | __cpu_to_le32s(&md5state.hash[i]); | |
590 | memcpy(iv, &md5state.hash, cc->iv_size); | |
591 | ||
592 | return 0; | |
593 | } | |
594 | ||
595 | static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, | |
596 | struct dm_crypt_request *dmreq) | |
597 | { | |
598 | u8 *src; | |
599 | int r = 0; | |
600 | ||
601 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { | |
c2e022cb | 602 | src = kmap_atomic(sg_page(&dmreq->sg_in)); |
34745785 | 603 | r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset); |
c2e022cb | 604 | kunmap_atomic(src); |
34745785 MB |
605 | } else |
606 | memset(iv, 0, cc->iv_size); | |
607 | ||
608 | return r; | |
609 | } | |
610 | ||
611 | static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, | |
612 | struct dm_crypt_request *dmreq) | |
613 | { | |
614 | u8 *dst; | |
615 | int r; | |
616 | ||
617 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) | |
618 | return 0; | |
619 | ||
c2e022cb | 620 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); |
34745785 MB |
621 | r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset); |
622 | ||
623 | /* Tweak the first block of plaintext sector */ | |
624 | if (!r) | |
625 | crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size); | |
626 | ||
c2e022cb | 627 | kunmap_atomic(dst); |
34745785 MB |
628 | return r; |
629 | } | |
630 | ||
ed04d981 MB |
631 | static void crypt_iv_tcw_dtr(struct crypt_config *cc) |
632 | { | |
633 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
634 | ||
635 | kzfree(tcw->iv_seed); | |
636 | tcw->iv_seed = NULL; | |
637 | kzfree(tcw->whitening); | |
638 | tcw->whitening = NULL; | |
639 | ||
640 | if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm)) | |
641 | crypto_free_shash(tcw->crc32_tfm); | |
642 | tcw->crc32_tfm = NULL; | |
643 | } | |
644 | ||
645 | static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti, | |
646 | const char *opts) | |
647 | { | |
648 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
649 | ||
650 | if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) { | |
651 | ti->error = "Wrong key size for TCW"; | |
652 | return -EINVAL; | |
653 | } | |
654 | ||
655 | tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0); | |
656 | if (IS_ERR(tcw->crc32_tfm)) { | |
657 | ti->error = "Error initializing CRC32 in TCW"; | |
658 | return PTR_ERR(tcw->crc32_tfm); | |
659 | } | |
660 | ||
661 | tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL); | |
662 | tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL); | |
663 | if (!tcw->iv_seed || !tcw->whitening) { | |
664 | crypt_iv_tcw_dtr(cc); | |
665 | ti->error = "Error allocating seed storage in TCW"; | |
666 | return -ENOMEM; | |
667 | } | |
668 | ||
669 | return 0; | |
670 | } | |
671 | ||
672 | static int crypt_iv_tcw_init(struct crypt_config *cc) | |
673 | { | |
674 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
675 | int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE; | |
676 | ||
677 | memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size); | |
678 | memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size], | |
679 | TCW_WHITENING_SIZE); | |
680 | ||
681 | return 0; | |
682 | } | |
683 | ||
684 | static int crypt_iv_tcw_wipe(struct crypt_config *cc) | |
685 | { | |
686 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
687 | ||
688 | memset(tcw->iv_seed, 0, cc->iv_size); | |
689 | memset(tcw->whitening, 0, TCW_WHITENING_SIZE); | |
690 | ||
691 | return 0; | |
692 | } | |
693 | ||
694 | static int crypt_iv_tcw_whitening(struct crypt_config *cc, | |
695 | struct dm_crypt_request *dmreq, | |
696 | u8 *data) | |
697 | { | |
698 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
699 | u64 sector = cpu_to_le64((u64)dmreq->iv_sector); | |
700 | u8 buf[TCW_WHITENING_SIZE]; | |
701 | struct { | |
702 | struct shash_desc desc; | |
703 | char ctx[crypto_shash_descsize(tcw->crc32_tfm)]; | |
704 | } sdesc; | |
705 | int i, r; | |
706 | ||
707 | /* xor whitening with sector number */ | |
708 | memcpy(buf, tcw->whitening, TCW_WHITENING_SIZE); | |
709 | crypto_xor(buf, (u8 *)§or, 8); | |
710 | crypto_xor(&buf[8], (u8 *)§or, 8); | |
711 | ||
712 | /* calculate crc32 for every 32bit part and xor it */ | |
713 | sdesc.desc.tfm = tcw->crc32_tfm; | |
714 | sdesc.desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
715 | for (i = 0; i < 4; i++) { | |
716 | r = crypto_shash_init(&sdesc.desc); | |
717 | if (r) | |
718 | goto out; | |
719 | r = crypto_shash_update(&sdesc.desc, &buf[i * 4], 4); | |
720 | if (r) | |
721 | goto out; | |
722 | r = crypto_shash_final(&sdesc.desc, &buf[i * 4]); | |
723 | if (r) | |
724 | goto out; | |
725 | } | |
726 | crypto_xor(&buf[0], &buf[12], 4); | |
727 | crypto_xor(&buf[4], &buf[8], 4); | |
728 | ||
729 | /* apply whitening (8 bytes) to whole sector */ | |
730 | for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++) | |
731 | crypto_xor(data + i * 8, buf, 8); | |
732 | out: | |
733 | memset(buf, 0, sizeof(buf)); | |
734 | return r; | |
735 | } | |
736 | ||
737 | static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, | |
738 | struct dm_crypt_request *dmreq) | |
739 | { | |
740 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
741 | u64 sector = cpu_to_le64((u64)dmreq->iv_sector); | |
742 | u8 *src; | |
743 | int r = 0; | |
744 | ||
745 | /* Remove whitening from ciphertext */ | |
746 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { | |
747 | src = kmap_atomic(sg_page(&dmreq->sg_in)); | |
748 | r = crypt_iv_tcw_whitening(cc, dmreq, src + dmreq->sg_in.offset); | |
749 | kunmap_atomic(src); | |
750 | } | |
751 | ||
752 | /* Calculate IV */ | |
753 | memcpy(iv, tcw->iv_seed, cc->iv_size); | |
754 | crypto_xor(iv, (u8 *)§or, 8); | |
755 | if (cc->iv_size > 8) | |
756 | crypto_xor(&iv[8], (u8 *)§or, cc->iv_size - 8); | |
757 | ||
758 | return r; | |
759 | } | |
760 | ||
761 | static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, | |
762 | struct dm_crypt_request *dmreq) | |
763 | { | |
764 | u8 *dst; | |
765 | int r; | |
766 | ||
767 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) | |
768 | return 0; | |
769 | ||
770 | /* Apply whitening on ciphertext */ | |
771 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); | |
772 | r = crypt_iv_tcw_whitening(cc, dmreq, dst + dmreq->sg_out.offset); | |
773 | kunmap_atomic(dst); | |
774 | ||
775 | return r; | |
776 | } | |
777 | ||
1da177e4 LT |
778 | static struct crypt_iv_operations crypt_iv_plain_ops = { |
779 | .generator = crypt_iv_plain_gen | |
780 | }; | |
781 | ||
61afef61 MB |
782 | static struct crypt_iv_operations crypt_iv_plain64_ops = { |
783 | .generator = crypt_iv_plain64_gen | |
784 | }; | |
785 | ||
1da177e4 LT |
786 | static struct crypt_iv_operations crypt_iv_essiv_ops = { |
787 | .ctr = crypt_iv_essiv_ctr, | |
788 | .dtr = crypt_iv_essiv_dtr, | |
b95bf2d3 | 789 | .init = crypt_iv_essiv_init, |
542da317 | 790 | .wipe = crypt_iv_essiv_wipe, |
1da177e4 LT |
791 | .generator = crypt_iv_essiv_gen |
792 | }; | |
793 | ||
48527fa7 RS |
794 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
795 | .ctr = crypt_iv_benbi_ctr, | |
796 | .dtr = crypt_iv_benbi_dtr, | |
797 | .generator = crypt_iv_benbi_gen | |
798 | }; | |
1da177e4 | 799 | |
46b47730 LN |
800 | static struct crypt_iv_operations crypt_iv_null_ops = { |
801 | .generator = crypt_iv_null_gen | |
802 | }; | |
803 | ||
34745785 MB |
804 | static struct crypt_iv_operations crypt_iv_lmk_ops = { |
805 | .ctr = crypt_iv_lmk_ctr, | |
806 | .dtr = crypt_iv_lmk_dtr, | |
807 | .init = crypt_iv_lmk_init, | |
808 | .wipe = crypt_iv_lmk_wipe, | |
809 | .generator = crypt_iv_lmk_gen, | |
810 | .post = crypt_iv_lmk_post | |
811 | }; | |
812 | ||
ed04d981 MB |
813 | static struct crypt_iv_operations crypt_iv_tcw_ops = { |
814 | .ctr = crypt_iv_tcw_ctr, | |
815 | .dtr = crypt_iv_tcw_dtr, | |
816 | .init = crypt_iv_tcw_init, | |
817 | .wipe = crypt_iv_tcw_wipe, | |
818 | .generator = crypt_iv_tcw_gen, | |
819 | .post = crypt_iv_tcw_post | |
820 | }; | |
821 | ||
d469f841 MB |
822 | static void crypt_convert_init(struct crypt_config *cc, |
823 | struct convert_context *ctx, | |
824 | struct bio *bio_out, struct bio *bio_in, | |
fcd369da | 825 | sector_t sector) |
1da177e4 LT |
826 | { |
827 | ctx->bio_in = bio_in; | |
828 | ctx->bio_out = bio_out; | |
829 | ctx->offset_in = 0; | |
830 | ctx->offset_out = 0; | |
831 | ctx->idx_in = bio_in ? bio_in->bi_idx : 0; | |
832 | ctx->idx_out = bio_out ? bio_out->bi_idx : 0; | |
c66029f4 | 833 | ctx->cc_sector = sector + cc->iv_offset; |
43d69034 | 834 | init_completion(&ctx->restart); |
1da177e4 LT |
835 | } |
836 | ||
b2174eeb HY |
837 | static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, |
838 | struct ablkcipher_request *req) | |
839 | { | |
840 | return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); | |
841 | } | |
842 | ||
843 | static struct ablkcipher_request *req_of_dmreq(struct crypt_config *cc, | |
844 | struct dm_crypt_request *dmreq) | |
845 | { | |
846 | return (struct ablkcipher_request *)((char *)dmreq - cc->dmreq_start); | |
847 | } | |
848 | ||
2dc5327d MB |
849 | static u8 *iv_of_dmreq(struct crypt_config *cc, |
850 | struct dm_crypt_request *dmreq) | |
851 | { | |
852 | return (u8 *)ALIGN((unsigned long)(dmreq + 1), | |
853 | crypto_ablkcipher_alignmask(any_tfm(cc)) + 1); | |
854 | } | |
855 | ||
01482b76 | 856 | static int crypt_convert_block(struct crypt_config *cc, |
3a7f6c99 MB |
857 | struct convert_context *ctx, |
858 | struct ablkcipher_request *req) | |
01482b76 MB |
859 | { |
860 | struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in); | |
861 | struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out); | |
3a7f6c99 MB |
862 | struct dm_crypt_request *dmreq; |
863 | u8 *iv; | |
40b6229b | 864 | int r; |
3a7f6c99 | 865 | |
b2174eeb | 866 | dmreq = dmreq_of_req(cc, req); |
2dc5327d | 867 | iv = iv_of_dmreq(cc, dmreq); |
01482b76 | 868 | |
c66029f4 | 869 | dmreq->iv_sector = ctx->cc_sector; |
b2174eeb | 870 | dmreq->ctx = ctx; |
3a7f6c99 MB |
871 | sg_init_table(&dmreq->sg_in, 1); |
872 | sg_set_page(&dmreq->sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT, | |
01482b76 MB |
873 | bv_in->bv_offset + ctx->offset_in); |
874 | ||
3a7f6c99 MB |
875 | sg_init_table(&dmreq->sg_out, 1); |
876 | sg_set_page(&dmreq->sg_out, bv_out->bv_page, 1 << SECTOR_SHIFT, | |
01482b76 MB |
877 | bv_out->bv_offset + ctx->offset_out); |
878 | ||
879 | ctx->offset_in += 1 << SECTOR_SHIFT; | |
880 | if (ctx->offset_in >= bv_in->bv_len) { | |
881 | ctx->offset_in = 0; | |
882 | ctx->idx_in++; | |
883 | } | |
884 | ||
885 | ctx->offset_out += 1 << SECTOR_SHIFT; | |
886 | if (ctx->offset_out >= bv_out->bv_len) { | |
887 | ctx->offset_out = 0; | |
888 | ctx->idx_out++; | |
889 | } | |
890 | ||
3a7f6c99 | 891 | if (cc->iv_gen_ops) { |
2dc5327d | 892 | r = cc->iv_gen_ops->generator(cc, iv, dmreq); |
3a7f6c99 MB |
893 | if (r < 0) |
894 | return r; | |
895 | } | |
896 | ||
897 | ablkcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out, | |
898 | 1 << SECTOR_SHIFT, iv); | |
899 | ||
900 | if (bio_data_dir(ctx->bio_in) == WRITE) | |
901 | r = crypto_ablkcipher_encrypt(req); | |
902 | else | |
903 | r = crypto_ablkcipher_decrypt(req); | |
904 | ||
2dc5327d MB |
905 | if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) |
906 | r = cc->iv_gen_ops->post(cc, iv, dmreq); | |
907 | ||
3a7f6c99 | 908 | return r; |
01482b76 MB |
909 | } |
910 | ||
95497a96 MB |
911 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
912 | int error); | |
c0297721 | 913 | |
ddd42edf MB |
914 | static void crypt_alloc_req(struct crypt_config *cc, |
915 | struct convert_context *ctx) | |
916 | { | |
c0297721 | 917 | struct crypt_cpu *this_cc = this_crypt_config(cc); |
c66029f4 | 918 | unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1); |
c0297721 AK |
919 | |
920 | if (!this_cc->req) | |
921 | this_cc->req = mempool_alloc(cc->req_pool, GFP_NOIO); | |
922 | ||
fd2d231f | 923 | ablkcipher_request_set_tfm(this_cc->req, cc->tfms[key_index]); |
c0297721 AK |
924 | ablkcipher_request_set_callback(this_cc->req, |
925 | CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, | |
926 | kcryptd_async_done, dmreq_of_req(cc, this_cc->req)); | |
ddd42edf MB |
927 | } |
928 | ||
1da177e4 LT |
929 | /* |
930 | * Encrypt / decrypt data from one bio to another one (can be the same one) | |
931 | */ | |
932 | static int crypt_convert(struct crypt_config *cc, | |
d469f841 | 933 | struct convert_context *ctx) |
1da177e4 | 934 | { |
c0297721 | 935 | struct crypt_cpu *this_cc = this_crypt_config(cc); |
3f1e9070 | 936 | int r; |
1da177e4 | 937 | |
40b6229b | 938 | atomic_set(&ctx->cc_pending, 1); |
c8081618 | 939 | |
1da177e4 LT |
940 | while(ctx->idx_in < ctx->bio_in->bi_vcnt && |
941 | ctx->idx_out < ctx->bio_out->bi_vcnt) { | |
1da177e4 | 942 | |
3a7f6c99 MB |
943 | crypt_alloc_req(cc, ctx); |
944 | ||
40b6229b | 945 | atomic_inc(&ctx->cc_pending); |
3f1e9070 | 946 | |
c0297721 | 947 | r = crypt_convert_block(cc, ctx, this_cc->req); |
3a7f6c99 MB |
948 | |
949 | switch (r) { | |
3f1e9070 | 950 | /* async */ |
3a7f6c99 MB |
951 | case -EBUSY: |
952 | wait_for_completion(&ctx->restart); | |
16735d02 | 953 | reinit_completion(&ctx->restart); |
3a7f6c99 MB |
954 | /* fall through*/ |
955 | case -EINPROGRESS: | |
c0297721 | 956 | this_cc->req = NULL; |
c66029f4 | 957 | ctx->cc_sector++; |
3f1e9070 MB |
958 | continue; |
959 | ||
960 | /* sync */ | |
3a7f6c99 | 961 | case 0: |
40b6229b | 962 | atomic_dec(&ctx->cc_pending); |
c66029f4 | 963 | ctx->cc_sector++; |
c7f1b204 | 964 | cond_resched(); |
3a7f6c99 | 965 | continue; |
3a7f6c99 | 966 | |
3f1e9070 MB |
967 | /* error */ |
968 | default: | |
40b6229b | 969 | atomic_dec(&ctx->cc_pending); |
3f1e9070 MB |
970 | return r; |
971 | } | |
1da177e4 LT |
972 | } |
973 | ||
3f1e9070 | 974 | return 0; |
1da177e4 LT |
975 | } |
976 | ||
977 | /* | |
978 | * Generate a new unfragmented bio with the given size | |
979 | * This should never violate the device limitations | |
933f01d4 MB |
980 | * May return a smaller bio when running out of pages, indicated by |
981 | * *out_of_pages set to 1. | |
1da177e4 | 982 | */ |
933f01d4 MB |
983 | static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size, |
984 | unsigned *out_of_pages) | |
1da177e4 | 985 | { |
49a8a920 | 986 | struct crypt_config *cc = io->cc; |
8b004457 | 987 | struct bio *clone; |
1da177e4 | 988 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
b4e3ca1a | 989 | gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM; |
91e10625 MB |
990 | unsigned i, len; |
991 | struct page *page; | |
1da177e4 | 992 | |
2f9941b6 | 993 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
8b004457 | 994 | if (!clone) |
1da177e4 | 995 | return NULL; |
1da177e4 | 996 | |
027581f3 | 997 | clone_init(io, clone); |
933f01d4 | 998 | *out_of_pages = 0; |
6a24c718 | 999 | |
f97380bc | 1000 | for (i = 0; i < nr_iovecs; i++) { |
91e10625 | 1001 | page = mempool_alloc(cc->page_pool, gfp_mask); |
933f01d4 MB |
1002 | if (!page) { |
1003 | *out_of_pages = 1; | |
1da177e4 | 1004 | break; |
933f01d4 | 1005 | } |
1da177e4 LT |
1006 | |
1007 | /* | |
aeb2deae MP |
1008 | * If additional pages cannot be allocated without waiting, |
1009 | * return a partially-allocated bio. The caller will then try | |
1010 | * to allocate more bios while submitting this partial bio. | |
1da177e4 | 1011 | */ |
aeb2deae | 1012 | gfp_mask = (gfp_mask | __GFP_NOWARN) & ~__GFP_WAIT; |
1da177e4 | 1013 | |
91e10625 MB |
1014 | len = (size > PAGE_SIZE) ? PAGE_SIZE : size; |
1015 | ||
1016 | if (!bio_add_page(clone, page, len, 0)) { | |
1017 | mempool_free(page, cc->page_pool); | |
1018 | break; | |
1019 | } | |
1da177e4 | 1020 | |
91e10625 | 1021 | size -= len; |
1da177e4 LT |
1022 | } |
1023 | ||
8b004457 MB |
1024 | if (!clone->bi_size) { |
1025 | bio_put(clone); | |
1da177e4 LT |
1026 | return NULL; |
1027 | } | |
1028 | ||
8b004457 | 1029 | return clone; |
1da177e4 LT |
1030 | } |
1031 | ||
644bd2f0 | 1032 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) |
1da177e4 | 1033 | { |
644bd2f0 | 1034 | unsigned int i; |
1da177e4 LT |
1035 | struct bio_vec *bv; |
1036 | ||
cb34e057 | 1037 | bio_for_each_segment_all(bv, clone, i) { |
1da177e4 LT |
1038 | BUG_ON(!bv->bv_page); |
1039 | mempool_free(bv->bv_page, cc->page_pool); | |
1040 | bv->bv_page = NULL; | |
1041 | } | |
1042 | } | |
1043 | ||
49a8a920 | 1044 | static struct dm_crypt_io *crypt_io_alloc(struct crypt_config *cc, |
dc440d1e MB |
1045 | struct bio *bio, sector_t sector) |
1046 | { | |
dc440d1e MB |
1047 | struct dm_crypt_io *io; |
1048 | ||
1049 | io = mempool_alloc(cc->io_pool, GFP_NOIO); | |
49a8a920 | 1050 | io->cc = cc; |
dc440d1e MB |
1051 | io->base_bio = bio; |
1052 | io->sector = sector; | |
1053 | io->error = 0; | |
393b47ef | 1054 | io->base_io = NULL; |
40b6229b | 1055 | atomic_set(&io->io_pending, 0); |
dc440d1e MB |
1056 | |
1057 | return io; | |
1058 | } | |
1059 | ||
3e1a8bdd MB |
1060 | static void crypt_inc_pending(struct dm_crypt_io *io) |
1061 | { | |
40b6229b | 1062 | atomic_inc(&io->io_pending); |
3e1a8bdd MB |
1063 | } |
1064 | ||
1da177e4 LT |
1065 | /* |
1066 | * One of the bios was finished. Check for completion of | |
1067 | * the whole request and correctly clean up the buffer. | |
393b47ef | 1068 | * If base_io is set, wait for the last fragment to complete. |
1da177e4 | 1069 | */ |
5742fd77 | 1070 | static void crypt_dec_pending(struct dm_crypt_io *io) |
1da177e4 | 1071 | { |
49a8a920 | 1072 | struct crypt_config *cc = io->cc; |
b35f8caa MB |
1073 | struct bio *base_bio = io->base_bio; |
1074 | struct dm_crypt_io *base_io = io->base_io; | |
1075 | int error = io->error; | |
1da177e4 | 1076 | |
40b6229b | 1077 | if (!atomic_dec_and_test(&io->io_pending)) |
1da177e4 LT |
1078 | return; |
1079 | ||
b35f8caa MB |
1080 | mempool_free(io, cc->io_pool); |
1081 | ||
1082 | if (likely(!base_io)) | |
1083 | bio_endio(base_bio, error); | |
393b47ef | 1084 | else { |
b35f8caa MB |
1085 | if (error && !base_io->error) |
1086 | base_io->error = error; | |
1087 | crypt_dec_pending(base_io); | |
393b47ef | 1088 | } |
1da177e4 LT |
1089 | } |
1090 | ||
1091 | /* | |
cabf08e4 | 1092 | * kcryptd/kcryptd_io: |
1da177e4 LT |
1093 | * |
1094 | * Needed because it would be very unwise to do decryption in an | |
23541d2d | 1095 | * interrupt context. |
cabf08e4 MB |
1096 | * |
1097 | * kcryptd performs the actual encryption or decryption. | |
1098 | * | |
1099 | * kcryptd_io performs the IO submission. | |
1100 | * | |
1101 | * They must be separated as otherwise the final stages could be | |
1102 | * starved by new requests which can block in the first stages due | |
1103 | * to memory allocation. | |
c0297721 AK |
1104 | * |
1105 | * The work is done per CPU global for all dm-crypt instances. | |
1106 | * They should not depend on each other and do not block. | |
1da177e4 | 1107 | */ |
6712ecf8 | 1108 | static void crypt_endio(struct bio *clone, int error) |
8b004457 | 1109 | { |
028867ac | 1110 | struct dm_crypt_io *io = clone->bi_private; |
49a8a920 | 1111 | struct crypt_config *cc = io->cc; |
ee7a491e | 1112 | unsigned rw = bio_data_dir(clone); |
8b004457 | 1113 | |
adfe4770 MB |
1114 | if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error)) |
1115 | error = -EIO; | |
1116 | ||
8b004457 | 1117 | /* |
6712ecf8 | 1118 | * free the processed pages |
8b004457 | 1119 | */ |
ee7a491e | 1120 | if (rw == WRITE) |
644bd2f0 | 1121 | crypt_free_buffer_pages(cc, clone); |
8b004457 MB |
1122 | |
1123 | bio_put(clone); | |
8b004457 | 1124 | |
ee7a491e MB |
1125 | if (rw == READ && !error) { |
1126 | kcryptd_queue_crypt(io); | |
1127 | return; | |
1128 | } | |
5742fd77 MB |
1129 | |
1130 | if (unlikely(error)) | |
1131 | io->error = error; | |
1132 | ||
1133 | crypt_dec_pending(io); | |
8b004457 MB |
1134 | } |
1135 | ||
028867ac | 1136 | static void clone_init(struct dm_crypt_io *io, struct bio *clone) |
8b004457 | 1137 | { |
49a8a920 | 1138 | struct crypt_config *cc = io->cc; |
8b004457 MB |
1139 | |
1140 | clone->bi_private = io; | |
1141 | clone->bi_end_io = crypt_endio; | |
1142 | clone->bi_bdev = cc->dev->bdev; | |
1143 | clone->bi_rw = io->base_bio->bi_rw; | |
1144 | } | |
1145 | ||
20c82538 | 1146 | static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) |
8b004457 | 1147 | { |
49a8a920 | 1148 | struct crypt_config *cc = io->cc; |
8b004457 MB |
1149 | struct bio *base_bio = io->base_bio; |
1150 | struct bio *clone; | |
93e605c2 | 1151 | |
8b004457 MB |
1152 | /* |
1153 | * The block layer might modify the bvec array, so always | |
1154 | * copy the required bvecs because we need the original | |
1155 | * one in order to decrypt the whole bio data *afterwards*. | |
1156 | */ | |
bf800ef1 | 1157 | clone = bio_clone_bioset(base_bio, gfp, cc->bs); |
7eaceacc | 1158 | if (!clone) |
20c82538 | 1159 | return 1; |
8b004457 | 1160 | |
20c82538 MB |
1161 | crypt_inc_pending(io); |
1162 | ||
8b004457 | 1163 | clone_init(io, clone); |
0c395b0f | 1164 | clone->bi_sector = cc->start + io->sector; |
8b004457 | 1165 | |
93e605c2 | 1166 | generic_make_request(clone); |
20c82538 | 1167 | return 0; |
8b004457 MB |
1168 | } |
1169 | ||
4e4eef64 MB |
1170 | static void kcryptd_io_write(struct dm_crypt_io *io) |
1171 | { | |
95497a96 | 1172 | struct bio *clone = io->ctx.bio_out; |
95497a96 | 1173 | generic_make_request(clone); |
4e4eef64 MB |
1174 | } |
1175 | ||
395b167c AK |
1176 | static void kcryptd_io(struct work_struct *work) |
1177 | { | |
1178 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); | |
1179 | ||
20c82538 MB |
1180 | if (bio_data_dir(io->base_bio) == READ) { |
1181 | crypt_inc_pending(io); | |
1182 | if (kcryptd_io_read(io, GFP_NOIO)) | |
1183 | io->error = -ENOMEM; | |
1184 | crypt_dec_pending(io); | |
1185 | } else | |
395b167c AK |
1186 | kcryptd_io_write(io); |
1187 | } | |
1188 | ||
1189 | static void kcryptd_queue_io(struct dm_crypt_io *io) | |
1190 | { | |
49a8a920 | 1191 | struct crypt_config *cc = io->cc; |
395b167c AK |
1192 | |
1193 | INIT_WORK(&io->work, kcryptd_io); | |
1194 | queue_work(cc->io_queue, &io->work); | |
1195 | } | |
1196 | ||
72c6e7af | 1197 | static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) |
4e4eef64 | 1198 | { |
dec1cedf | 1199 | struct bio *clone = io->ctx.bio_out; |
49a8a920 | 1200 | struct crypt_config *cc = io->cc; |
dec1cedf | 1201 | |
72c6e7af | 1202 | if (unlikely(io->error < 0)) { |
dec1cedf MB |
1203 | crypt_free_buffer_pages(cc, clone); |
1204 | bio_put(clone); | |
6c031f41 | 1205 | crypt_dec_pending(io); |
dec1cedf MB |
1206 | return; |
1207 | } | |
1208 | ||
1209 | /* crypt_convert should have filled the clone bio */ | |
1210 | BUG_ON(io->ctx.idx_out < clone->bi_vcnt); | |
1211 | ||
1212 | clone->bi_sector = cc->start + io->sector; | |
899c95d3 | 1213 | |
95497a96 MB |
1214 | if (async) |
1215 | kcryptd_queue_io(io); | |
1e37bb8e | 1216 | else |
95497a96 | 1217 | generic_make_request(clone); |
4e4eef64 MB |
1218 | } |
1219 | ||
fc5a5e9a | 1220 | static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) |
8b004457 | 1221 | { |
49a8a920 | 1222 | struct crypt_config *cc = io->cc; |
8b004457 | 1223 | struct bio *clone; |
393b47ef | 1224 | struct dm_crypt_io *new_io; |
c8081618 | 1225 | int crypt_finished; |
933f01d4 | 1226 | unsigned out_of_pages = 0; |
dec1cedf | 1227 | unsigned remaining = io->base_bio->bi_size; |
b635b00e | 1228 | sector_t sector = io->sector; |
dec1cedf | 1229 | int r; |
8b004457 | 1230 | |
fc5a5e9a MB |
1231 | /* |
1232 | * Prevent io from disappearing until this function completes. | |
1233 | */ | |
1234 | crypt_inc_pending(io); | |
b635b00e | 1235 | crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); |
fc5a5e9a | 1236 | |
93e605c2 MB |
1237 | /* |
1238 | * The allocated buffers can be smaller than the whole bio, | |
1239 | * so repeat the whole process until all the data can be handled. | |
1240 | */ | |
1241 | while (remaining) { | |
933f01d4 | 1242 | clone = crypt_alloc_buffer(io, remaining, &out_of_pages); |
23541d2d | 1243 | if (unlikely(!clone)) { |
5742fd77 | 1244 | io->error = -ENOMEM; |
fc5a5e9a | 1245 | break; |
23541d2d | 1246 | } |
93e605c2 | 1247 | |
53017030 MB |
1248 | io->ctx.bio_out = clone; |
1249 | io->ctx.idx_out = 0; | |
93e605c2 | 1250 | |
dec1cedf | 1251 | remaining -= clone->bi_size; |
b635b00e | 1252 | sector += bio_sectors(clone); |
93e605c2 | 1253 | |
4e594098 | 1254 | crypt_inc_pending(io); |
72c6e7af | 1255 | |
dec1cedf | 1256 | r = crypt_convert(cc, &io->ctx); |
72c6e7af MP |
1257 | if (r < 0) |
1258 | io->error = -EIO; | |
1259 | ||
40b6229b | 1260 | crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending); |
f97380bc | 1261 | |
c8081618 MB |
1262 | /* Encryption was already finished, submit io now */ |
1263 | if (crypt_finished) { | |
72c6e7af | 1264 | kcryptd_crypt_write_io_submit(io, 0); |
c8081618 MB |
1265 | |
1266 | /* | |
1267 | * If there was an error, do not try next fragments. | |
1268 | * For async, error is processed in async handler. | |
1269 | */ | |
6c031f41 | 1270 | if (unlikely(r < 0)) |
fc5a5e9a | 1271 | break; |
b635b00e MB |
1272 | |
1273 | io->sector = sector; | |
4e594098 | 1274 | } |
93e605c2 | 1275 | |
933f01d4 MB |
1276 | /* |
1277 | * Out of memory -> run queues | |
1278 | * But don't wait if split was due to the io size restriction | |
1279 | */ | |
1280 | if (unlikely(out_of_pages)) | |
8aa7e847 | 1281 | congestion_wait(BLK_RW_ASYNC, HZ/100); |
933f01d4 | 1282 | |
393b47ef MB |
1283 | /* |
1284 | * With async crypto it is unsafe to share the crypto context | |
1285 | * between fragments, so switch to a new dm_crypt_io structure. | |
1286 | */ | |
1287 | if (unlikely(!crypt_finished && remaining)) { | |
49a8a920 | 1288 | new_io = crypt_io_alloc(io->cc, io->base_bio, |
393b47ef MB |
1289 | sector); |
1290 | crypt_inc_pending(new_io); | |
1291 | crypt_convert_init(cc, &new_io->ctx, NULL, | |
1292 | io->base_bio, sector); | |
1293 | new_io->ctx.idx_in = io->ctx.idx_in; | |
1294 | new_io->ctx.offset_in = io->ctx.offset_in; | |
1295 | ||
1296 | /* | |
1297 | * Fragments after the first use the base_io | |
1298 | * pending count. | |
1299 | */ | |
1300 | if (!io->base_io) | |
1301 | new_io->base_io = io; | |
1302 | else { | |
1303 | new_io->base_io = io->base_io; | |
1304 | crypt_inc_pending(io->base_io); | |
1305 | crypt_dec_pending(io); | |
1306 | } | |
1307 | ||
1308 | io = new_io; | |
1309 | } | |
93e605c2 | 1310 | } |
899c95d3 MB |
1311 | |
1312 | crypt_dec_pending(io); | |
84131db6 MB |
1313 | } |
1314 | ||
72c6e7af | 1315 | static void kcryptd_crypt_read_done(struct dm_crypt_io *io) |
5742fd77 | 1316 | { |
5742fd77 MB |
1317 | crypt_dec_pending(io); |
1318 | } | |
1319 | ||
4e4eef64 | 1320 | static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) |
8b004457 | 1321 | { |
49a8a920 | 1322 | struct crypt_config *cc = io->cc; |
5742fd77 | 1323 | int r = 0; |
1da177e4 | 1324 | |
3e1a8bdd | 1325 | crypt_inc_pending(io); |
3a7f6c99 | 1326 | |
53017030 | 1327 | crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, |
0c395b0f | 1328 | io->sector); |
1da177e4 | 1329 | |
5742fd77 | 1330 | r = crypt_convert(cc, &io->ctx); |
72c6e7af MP |
1331 | if (r < 0) |
1332 | io->error = -EIO; | |
5742fd77 | 1333 | |
40b6229b | 1334 | if (atomic_dec_and_test(&io->ctx.cc_pending)) |
72c6e7af | 1335 | kcryptd_crypt_read_done(io); |
3a7f6c99 MB |
1336 | |
1337 | crypt_dec_pending(io); | |
1da177e4 LT |
1338 | } |
1339 | ||
95497a96 MB |
1340 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
1341 | int error) | |
1342 | { | |
b2174eeb HY |
1343 | struct dm_crypt_request *dmreq = async_req->data; |
1344 | struct convert_context *ctx = dmreq->ctx; | |
95497a96 | 1345 | struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); |
49a8a920 | 1346 | struct crypt_config *cc = io->cc; |
95497a96 MB |
1347 | |
1348 | if (error == -EINPROGRESS) { | |
1349 | complete(&ctx->restart); | |
1350 | return; | |
1351 | } | |
1352 | ||
2dc5327d MB |
1353 | if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) |
1354 | error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq); | |
1355 | ||
72c6e7af MP |
1356 | if (error < 0) |
1357 | io->error = -EIO; | |
1358 | ||
b2174eeb | 1359 | mempool_free(req_of_dmreq(cc, dmreq), cc->req_pool); |
95497a96 | 1360 | |
40b6229b | 1361 | if (!atomic_dec_and_test(&ctx->cc_pending)) |
95497a96 MB |
1362 | return; |
1363 | ||
1364 | if (bio_data_dir(io->base_bio) == READ) | |
72c6e7af | 1365 | kcryptd_crypt_read_done(io); |
95497a96 | 1366 | else |
72c6e7af | 1367 | kcryptd_crypt_write_io_submit(io, 1); |
95497a96 MB |
1368 | } |
1369 | ||
395b167c | 1370 | static void kcryptd_crypt(struct work_struct *work) |
1da177e4 | 1371 | { |
028867ac | 1372 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
8b004457 | 1373 | |
cabf08e4 | 1374 | if (bio_data_dir(io->base_bio) == READ) |
395b167c | 1375 | kcryptd_crypt_read_convert(io); |
4e4eef64 | 1376 | else |
395b167c | 1377 | kcryptd_crypt_write_convert(io); |
cabf08e4 MB |
1378 | } |
1379 | ||
395b167c | 1380 | static void kcryptd_queue_crypt(struct dm_crypt_io *io) |
cabf08e4 | 1381 | { |
49a8a920 | 1382 | struct crypt_config *cc = io->cc; |
cabf08e4 | 1383 | |
395b167c AK |
1384 | INIT_WORK(&io->work, kcryptd_crypt); |
1385 | queue_work(cc->crypt_queue, &io->work); | |
1da177e4 LT |
1386 | } |
1387 | ||
1388 | /* | |
1389 | * Decode key from its hex representation | |
1390 | */ | |
1391 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) | |
1392 | { | |
1393 | char buffer[3]; | |
1da177e4 LT |
1394 | unsigned int i; |
1395 | ||
1396 | buffer[2] = '\0'; | |
1397 | ||
8b004457 | 1398 | for (i = 0; i < size; i++) { |
1da177e4 LT |
1399 | buffer[0] = *hex++; |
1400 | buffer[1] = *hex++; | |
1401 | ||
1a66a08a | 1402 | if (kstrtou8(buffer, 16, &key[i])) |
1da177e4 LT |
1403 | return -EINVAL; |
1404 | } | |
1405 | ||
1406 | if (*hex != '\0') | |
1407 | return -EINVAL; | |
1408 | ||
1409 | return 0; | |
1410 | } | |
1411 | ||
fd2d231f | 1412 | static void crypt_free_tfms(struct crypt_config *cc) |
d1f96423 | 1413 | { |
d1f96423 MB |
1414 | unsigned i; |
1415 | ||
fd2d231f MP |
1416 | if (!cc->tfms) |
1417 | return; | |
1418 | ||
d1f96423 | 1419 | for (i = 0; i < cc->tfms_count; i++) |
fd2d231f MP |
1420 | if (cc->tfms[i] && !IS_ERR(cc->tfms[i])) { |
1421 | crypto_free_ablkcipher(cc->tfms[i]); | |
1422 | cc->tfms[i] = NULL; | |
d1f96423 | 1423 | } |
fd2d231f MP |
1424 | |
1425 | kfree(cc->tfms); | |
1426 | cc->tfms = NULL; | |
d1f96423 MB |
1427 | } |
1428 | ||
fd2d231f | 1429 | static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) |
d1f96423 | 1430 | { |
d1f96423 MB |
1431 | unsigned i; |
1432 | int err; | |
1433 | ||
fd2d231f MP |
1434 | cc->tfms = kmalloc(cc->tfms_count * sizeof(struct crypto_ablkcipher *), |
1435 | GFP_KERNEL); | |
1436 | if (!cc->tfms) | |
1437 | return -ENOMEM; | |
1438 | ||
d1f96423 | 1439 | for (i = 0; i < cc->tfms_count; i++) { |
fd2d231f MP |
1440 | cc->tfms[i] = crypto_alloc_ablkcipher(ciphermode, 0, 0); |
1441 | if (IS_ERR(cc->tfms[i])) { | |
1442 | err = PTR_ERR(cc->tfms[i]); | |
1443 | crypt_free_tfms(cc); | |
d1f96423 MB |
1444 | return err; |
1445 | } | |
1446 | } | |
1447 | ||
1448 | return 0; | |
1449 | } | |
1450 | ||
c0297721 AK |
1451 | static int crypt_setkey_allcpus(struct crypt_config *cc) |
1452 | { | |
da31a078 | 1453 | unsigned subkey_size; |
fd2d231f MP |
1454 | int err = 0, i, r; |
1455 | ||
da31a078 MB |
1456 | /* Ignore extra keys (which are used for IV etc) */ |
1457 | subkey_size = (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); | |
1458 | ||
fd2d231f MP |
1459 | for (i = 0; i < cc->tfms_count; i++) { |
1460 | r = crypto_ablkcipher_setkey(cc->tfms[i], | |
1461 | cc->key + (i * subkey_size), | |
1462 | subkey_size); | |
1463 | if (r) | |
1464 | err = r; | |
c0297721 AK |
1465 | } |
1466 | ||
1467 | return err; | |
1468 | } | |
1469 | ||
e48d4bbf MB |
1470 | static int crypt_set_key(struct crypt_config *cc, char *key) |
1471 | { | |
de8be5ac MB |
1472 | int r = -EINVAL; |
1473 | int key_string_len = strlen(key); | |
1474 | ||
69a8cfcd | 1475 | /* The key size may not be changed. */ |
de8be5ac MB |
1476 | if (cc->key_size != (key_string_len >> 1)) |
1477 | goto out; | |
e48d4bbf | 1478 | |
69a8cfcd MB |
1479 | /* Hyphen (which gives a key_size of zero) means there is no key. */ |
1480 | if (!cc->key_size && strcmp(key, "-")) | |
de8be5ac | 1481 | goto out; |
e48d4bbf | 1482 | |
69a8cfcd | 1483 | if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0) |
de8be5ac | 1484 | goto out; |
e48d4bbf MB |
1485 | |
1486 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1487 | ||
de8be5ac MB |
1488 | r = crypt_setkey_allcpus(cc); |
1489 | ||
1490 | out: | |
1491 | /* Hex key string not needed after here, so wipe it. */ | |
1492 | memset(key, '0', key_string_len); | |
1493 | ||
1494 | return r; | |
e48d4bbf MB |
1495 | } |
1496 | ||
1497 | static int crypt_wipe_key(struct crypt_config *cc) | |
1498 | { | |
1499 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1500 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); | |
c0297721 AK |
1501 | |
1502 | return crypt_setkey_allcpus(cc); | |
e48d4bbf MB |
1503 | } |
1504 | ||
28513fcc MB |
1505 | static void crypt_dtr(struct dm_target *ti) |
1506 | { | |
1507 | struct crypt_config *cc = ti->private; | |
c0297721 AK |
1508 | struct crypt_cpu *cpu_cc; |
1509 | int cpu; | |
28513fcc MB |
1510 | |
1511 | ti->private = NULL; | |
1512 | ||
1513 | if (!cc) | |
1514 | return; | |
1515 | ||
1516 | if (cc->io_queue) | |
1517 | destroy_workqueue(cc->io_queue); | |
1518 | if (cc->crypt_queue) | |
1519 | destroy_workqueue(cc->crypt_queue); | |
1520 | ||
c0297721 AK |
1521 | if (cc->cpu) |
1522 | for_each_possible_cpu(cpu) { | |
1523 | cpu_cc = per_cpu_ptr(cc->cpu, cpu); | |
1524 | if (cpu_cc->req) | |
1525 | mempool_free(cpu_cc->req, cc->req_pool); | |
c0297721 AK |
1526 | } |
1527 | ||
fd2d231f MP |
1528 | crypt_free_tfms(cc); |
1529 | ||
28513fcc MB |
1530 | if (cc->bs) |
1531 | bioset_free(cc->bs); | |
1532 | ||
1533 | if (cc->page_pool) | |
1534 | mempool_destroy(cc->page_pool); | |
1535 | if (cc->req_pool) | |
1536 | mempool_destroy(cc->req_pool); | |
1537 | if (cc->io_pool) | |
1538 | mempool_destroy(cc->io_pool); | |
1539 | ||
1540 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) | |
1541 | cc->iv_gen_ops->dtr(cc); | |
1542 | ||
28513fcc MB |
1543 | if (cc->dev) |
1544 | dm_put_device(ti, cc->dev); | |
1545 | ||
c0297721 AK |
1546 | if (cc->cpu) |
1547 | free_percpu(cc->cpu); | |
1548 | ||
5ebaee6d | 1549 | kzfree(cc->cipher); |
7dbcd137 | 1550 | kzfree(cc->cipher_string); |
28513fcc MB |
1551 | |
1552 | /* Must zero key material before freeing */ | |
1553 | kzfree(cc); | |
1554 | } | |
1555 | ||
5ebaee6d MB |
1556 | static int crypt_ctr_cipher(struct dm_target *ti, |
1557 | char *cipher_in, char *key) | |
1da177e4 | 1558 | { |
5ebaee6d | 1559 | struct crypt_config *cc = ti->private; |
d1f96423 | 1560 | char *tmp, *cipher, *chainmode, *ivmode, *ivopts, *keycount; |
5ebaee6d | 1561 | char *cipher_api = NULL; |
fd2d231f | 1562 | int ret = -EINVAL; |
31998ef1 | 1563 | char dummy; |
1da177e4 | 1564 | |
5ebaee6d MB |
1565 | /* Convert to crypto api definition? */ |
1566 | if (strchr(cipher_in, '(')) { | |
1567 | ti->error = "Bad cipher specification"; | |
1da177e4 LT |
1568 | return -EINVAL; |
1569 | } | |
1570 | ||
7dbcd137 MB |
1571 | cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); |
1572 | if (!cc->cipher_string) | |
1573 | goto bad_mem; | |
1574 | ||
5ebaee6d MB |
1575 | /* |
1576 | * Legacy dm-crypt cipher specification | |
d1f96423 | 1577 | * cipher[:keycount]-mode-iv:ivopts |
5ebaee6d MB |
1578 | */ |
1579 | tmp = cipher_in; | |
d1f96423 MB |
1580 | keycount = strsep(&tmp, "-"); |
1581 | cipher = strsep(&keycount, ":"); | |
1582 | ||
1583 | if (!keycount) | |
1584 | cc->tfms_count = 1; | |
31998ef1 | 1585 | else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || |
d1f96423 MB |
1586 | !is_power_of_2(cc->tfms_count)) { |
1587 | ti->error = "Bad cipher key count specification"; | |
1588 | return -EINVAL; | |
1589 | } | |
1590 | cc->key_parts = cc->tfms_count; | |
da31a078 | 1591 | cc->key_extra_size = 0; |
5ebaee6d MB |
1592 | |
1593 | cc->cipher = kstrdup(cipher, GFP_KERNEL); | |
1594 | if (!cc->cipher) | |
1595 | goto bad_mem; | |
1596 | ||
1da177e4 LT |
1597 | chainmode = strsep(&tmp, "-"); |
1598 | ivopts = strsep(&tmp, "-"); | |
1599 | ivmode = strsep(&ivopts, ":"); | |
1600 | ||
1601 | if (tmp) | |
5ebaee6d | 1602 | DMWARN("Ignoring unexpected additional cipher options"); |
1da177e4 | 1603 | |
fd2d231f | 1604 | cc->cpu = __alloc_percpu(sizeof(*(cc->cpu)), |
d1f96423 | 1605 | __alignof__(struct crypt_cpu)); |
c0297721 AK |
1606 | if (!cc->cpu) { |
1607 | ti->error = "Cannot allocate per cpu state"; | |
1608 | goto bad_mem; | |
1609 | } | |
1610 | ||
7dbcd137 MB |
1611 | /* |
1612 | * For compatibility with the original dm-crypt mapping format, if | |
1613 | * only the cipher name is supplied, use cbc-plain. | |
1614 | */ | |
5ebaee6d | 1615 | if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) { |
1da177e4 LT |
1616 | chainmode = "cbc"; |
1617 | ivmode = "plain"; | |
1618 | } | |
1619 | ||
d1806f6a | 1620 | if (strcmp(chainmode, "ecb") && !ivmode) { |
5ebaee6d MB |
1621 | ti->error = "IV mechanism required"; |
1622 | return -EINVAL; | |
1da177e4 LT |
1623 | } |
1624 | ||
5ebaee6d MB |
1625 | cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); |
1626 | if (!cipher_api) | |
1627 | goto bad_mem; | |
1628 | ||
1629 | ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, | |
1630 | "%s(%s)", chainmode, cipher); | |
1631 | if (ret < 0) { | |
1632 | kfree(cipher_api); | |
1633 | goto bad_mem; | |
1da177e4 LT |
1634 | } |
1635 | ||
5ebaee6d | 1636 | /* Allocate cipher */ |
fd2d231f MP |
1637 | ret = crypt_alloc_tfms(cc, cipher_api); |
1638 | if (ret < 0) { | |
1639 | ti->error = "Error allocating crypto tfm"; | |
1640 | goto bad; | |
1da177e4 | 1641 | } |
1da177e4 | 1642 | |
5ebaee6d | 1643 | /* Initialize IV */ |
c0297721 | 1644 | cc->iv_size = crypto_ablkcipher_ivsize(any_tfm(cc)); |
5ebaee6d MB |
1645 | if (cc->iv_size) |
1646 | /* at least a 64 bit sector number should fit in our buffer */ | |
1647 | cc->iv_size = max(cc->iv_size, | |
1648 | (unsigned int)(sizeof(u64) / sizeof(u8))); | |
1649 | else if (ivmode) { | |
1650 | DMWARN("Selected cipher does not support IVs"); | |
1651 | ivmode = NULL; | |
1652 | } | |
1653 | ||
1654 | /* Choose ivmode, see comments at iv code. */ | |
1da177e4 LT |
1655 | if (ivmode == NULL) |
1656 | cc->iv_gen_ops = NULL; | |
1657 | else if (strcmp(ivmode, "plain") == 0) | |
1658 | cc->iv_gen_ops = &crypt_iv_plain_ops; | |
61afef61 MB |
1659 | else if (strcmp(ivmode, "plain64") == 0) |
1660 | cc->iv_gen_ops = &crypt_iv_plain64_ops; | |
1da177e4 LT |
1661 | else if (strcmp(ivmode, "essiv") == 0) |
1662 | cc->iv_gen_ops = &crypt_iv_essiv_ops; | |
48527fa7 RS |
1663 | else if (strcmp(ivmode, "benbi") == 0) |
1664 | cc->iv_gen_ops = &crypt_iv_benbi_ops; | |
46b47730 LN |
1665 | else if (strcmp(ivmode, "null") == 0) |
1666 | cc->iv_gen_ops = &crypt_iv_null_ops; | |
34745785 MB |
1667 | else if (strcmp(ivmode, "lmk") == 0) { |
1668 | cc->iv_gen_ops = &crypt_iv_lmk_ops; | |
ed04d981 MB |
1669 | /* |
1670 | * Version 2 and 3 is recognised according | |
34745785 MB |
1671 | * to length of provided multi-key string. |
1672 | * If present (version 3), last key is used as IV seed. | |
ed04d981 | 1673 | * All keys (including IV seed) are always the same size. |
34745785 | 1674 | */ |
da31a078 | 1675 | if (cc->key_size % cc->key_parts) { |
34745785 | 1676 | cc->key_parts++; |
da31a078 MB |
1677 | cc->key_extra_size = cc->key_size / cc->key_parts; |
1678 | } | |
ed04d981 MB |
1679 | } else if (strcmp(ivmode, "tcw") == 0) { |
1680 | cc->iv_gen_ops = &crypt_iv_tcw_ops; | |
1681 | cc->key_parts += 2; /* IV + whitening */ | |
1682 | cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; | |
34745785 | 1683 | } else { |
5ebaee6d | 1684 | ret = -EINVAL; |
72d94861 | 1685 | ti->error = "Invalid IV mode"; |
28513fcc | 1686 | goto bad; |
1da177e4 LT |
1687 | } |
1688 | ||
da31a078 MB |
1689 | /* Initialize and set key */ |
1690 | ret = crypt_set_key(cc, key); | |
1691 | if (ret < 0) { | |
1692 | ti->error = "Error decoding and setting key"; | |
1693 | goto bad; | |
1694 | } | |
1695 | ||
28513fcc MB |
1696 | /* Allocate IV */ |
1697 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { | |
1698 | ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); | |
1699 | if (ret < 0) { | |
1700 | ti->error = "Error creating IV"; | |
1701 | goto bad; | |
1702 | } | |
1703 | } | |
1da177e4 | 1704 | |
28513fcc MB |
1705 | /* Initialize IV (set keys for ESSIV etc) */ |
1706 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) { | |
1707 | ret = cc->iv_gen_ops->init(cc); | |
1708 | if (ret < 0) { | |
1709 | ti->error = "Error initialising IV"; | |
1710 | goto bad; | |
1711 | } | |
b95bf2d3 MB |
1712 | } |
1713 | ||
5ebaee6d MB |
1714 | ret = 0; |
1715 | bad: | |
1716 | kfree(cipher_api); | |
1717 | return ret; | |
1718 | ||
1719 | bad_mem: | |
1720 | ti->error = "Cannot allocate cipher strings"; | |
1721 | return -ENOMEM; | |
1722 | } | |
1723 | ||
1724 | /* | |
1725 | * Construct an encryption mapping: | |
1726 | * <cipher> <key> <iv_offset> <dev_path> <start> | |
1727 | */ | |
1728 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
1729 | { | |
1730 | struct crypt_config *cc; | |
772ae5f5 | 1731 | unsigned int key_size, opt_params; |
5ebaee6d MB |
1732 | unsigned long long tmpll; |
1733 | int ret; | |
772ae5f5 MB |
1734 | struct dm_arg_set as; |
1735 | const char *opt_string; | |
31998ef1 | 1736 | char dummy; |
772ae5f5 MB |
1737 | |
1738 | static struct dm_arg _args[] = { | |
1739 | {0, 1, "Invalid number of feature args"}, | |
1740 | }; | |
5ebaee6d | 1741 | |
772ae5f5 | 1742 | if (argc < 5) { |
5ebaee6d MB |
1743 | ti->error = "Not enough arguments"; |
1744 | return -EINVAL; | |
1da177e4 LT |
1745 | } |
1746 | ||
5ebaee6d MB |
1747 | key_size = strlen(argv[1]) >> 1; |
1748 | ||
1749 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); | |
1750 | if (!cc) { | |
1751 | ti->error = "Cannot allocate encryption context"; | |
1752 | return -ENOMEM; | |
1753 | } | |
69a8cfcd | 1754 | cc->key_size = key_size; |
5ebaee6d MB |
1755 | |
1756 | ti->private = cc; | |
1757 | ret = crypt_ctr_cipher(ti, argv[0], argv[1]); | |
1758 | if (ret < 0) | |
1759 | goto bad; | |
1760 | ||
28513fcc | 1761 | ret = -ENOMEM; |
93d2341c | 1762 | cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool); |
1da177e4 | 1763 | if (!cc->io_pool) { |
72d94861 | 1764 | ti->error = "Cannot allocate crypt io mempool"; |
28513fcc | 1765 | goto bad; |
1da177e4 LT |
1766 | } |
1767 | ||
ddd42edf | 1768 | cc->dmreq_start = sizeof(struct ablkcipher_request); |
c0297721 | 1769 | cc->dmreq_start += crypto_ablkcipher_reqsize(any_tfm(cc)); |
ddd42edf | 1770 | cc->dmreq_start = ALIGN(cc->dmreq_start, crypto_tfm_ctx_alignment()); |
c0297721 | 1771 | cc->dmreq_start += crypto_ablkcipher_alignmask(any_tfm(cc)) & |
3a7f6c99 | 1772 | ~(crypto_tfm_ctx_alignment() - 1); |
ddd42edf MB |
1773 | |
1774 | cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + | |
1775 | sizeof(struct dm_crypt_request) + cc->iv_size); | |
1776 | if (!cc->req_pool) { | |
1777 | ti->error = "Cannot allocate crypt request mempool"; | |
28513fcc | 1778 | goto bad; |
ddd42edf | 1779 | } |
ddd42edf | 1780 | |
a19b27ce | 1781 | cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0); |
1da177e4 | 1782 | if (!cc->page_pool) { |
72d94861 | 1783 | ti->error = "Cannot allocate page mempool"; |
28513fcc | 1784 | goto bad; |
1da177e4 LT |
1785 | } |
1786 | ||
bb799ca0 | 1787 | cc->bs = bioset_create(MIN_IOS, 0); |
6a24c718 MB |
1788 | if (!cc->bs) { |
1789 | ti->error = "Cannot allocate crypt bioset"; | |
28513fcc | 1790 | goto bad; |
6a24c718 MB |
1791 | } |
1792 | ||
28513fcc | 1793 | ret = -EINVAL; |
31998ef1 | 1794 | if (sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1795 | ti->error = "Invalid iv_offset sector"; |
28513fcc | 1796 | goto bad; |
1da177e4 | 1797 | } |
4ee218cd | 1798 | cc->iv_offset = tmpll; |
1da177e4 | 1799 | |
28513fcc MB |
1800 | if (dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev)) { |
1801 | ti->error = "Device lookup failed"; | |
1802 | goto bad; | |
1803 | } | |
1804 | ||
31998ef1 | 1805 | if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1806 | ti->error = "Invalid device sector"; |
28513fcc | 1807 | goto bad; |
1da177e4 | 1808 | } |
4ee218cd | 1809 | cc->start = tmpll; |
1da177e4 | 1810 | |
772ae5f5 MB |
1811 | argv += 5; |
1812 | argc -= 5; | |
1813 | ||
1814 | /* Optional parameters */ | |
1815 | if (argc) { | |
1816 | as.argc = argc; | |
1817 | as.argv = argv; | |
1818 | ||
1819 | ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); | |
1820 | if (ret) | |
1821 | goto bad; | |
1822 | ||
1823 | opt_string = dm_shift_arg(&as); | |
1824 | ||
1825 | if (opt_params == 1 && opt_string && | |
1826 | !strcasecmp(opt_string, "allow_discards")) | |
55a62eef | 1827 | ti->num_discard_bios = 1; |
772ae5f5 MB |
1828 | else if (opt_params) { |
1829 | ret = -EINVAL; | |
1830 | ti->error = "Invalid feature arguments"; | |
1831 | goto bad; | |
1832 | } | |
1833 | } | |
1834 | ||
28513fcc | 1835 | ret = -ENOMEM; |
670368a8 | 1836 | cc->io_queue = alloc_workqueue("kcryptd_io", WQ_MEM_RECLAIM, 1); |
cabf08e4 MB |
1837 | if (!cc->io_queue) { |
1838 | ti->error = "Couldn't create kcryptd io queue"; | |
28513fcc | 1839 | goto bad; |
cabf08e4 MB |
1840 | } |
1841 | ||
c0297721 | 1842 | cc->crypt_queue = alloc_workqueue("kcryptd", |
670368a8 | 1843 | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1); |
cabf08e4 | 1844 | if (!cc->crypt_queue) { |
9934a8be | 1845 | ti->error = "Couldn't create kcryptd queue"; |
28513fcc | 1846 | goto bad; |
9934a8be MB |
1847 | } |
1848 | ||
55a62eef | 1849 | ti->num_flush_bios = 1; |
0ac55489 | 1850 | ti->discard_zeroes_data_unsupported = true; |
983c7db3 | 1851 | |
1da177e4 LT |
1852 | return 0; |
1853 | ||
28513fcc MB |
1854 | bad: |
1855 | crypt_dtr(ti); | |
1856 | return ret; | |
1da177e4 LT |
1857 | } |
1858 | ||
7de3ee57 | 1859 | static int crypt_map(struct dm_target *ti, struct bio *bio) |
1da177e4 | 1860 | { |
028867ac | 1861 | struct dm_crypt_io *io; |
49a8a920 | 1862 | struct crypt_config *cc = ti->private; |
647c7db1 | 1863 | |
772ae5f5 MB |
1864 | /* |
1865 | * If bio is REQ_FLUSH or REQ_DISCARD, just bypass crypt queues. | |
1866 | * - for REQ_FLUSH device-mapper core ensures that no IO is in-flight | |
1867 | * - for REQ_DISCARD caller must use flush if IO ordering matters | |
1868 | */ | |
1869 | if (unlikely(bio->bi_rw & (REQ_FLUSH | REQ_DISCARD))) { | |
647c7db1 | 1870 | bio->bi_bdev = cc->dev->bdev; |
772ae5f5 MB |
1871 | if (bio_sectors(bio)) |
1872 | bio->bi_sector = cc->start + dm_target_offset(ti, bio->bi_sector); | |
647c7db1 MP |
1873 | return DM_MAPIO_REMAPPED; |
1874 | } | |
1da177e4 | 1875 | |
49a8a920 | 1876 | io = crypt_io_alloc(cc, bio, dm_target_offset(ti, bio->bi_sector)); |
cabf08e4 | 1877 | |
20c82538 MB |
1878 | if (bio_data_dir(io->base_bio) == READ) { |
1879 | if (kcryptd_io_read(io, GFP_NOWAIT)) | |
1880 | kcryptd_queue_io(io); | |
1881 | } else | |
cabf08e4 | 1882 | kcryptd_queue_crypt(io); |
1da177e4 | 1883 | |
d2a7ad29 | 1884 | return DM_MAPIO_SUBMITTED; |
1da177e4 LT |
1885 | } |
1886 | ||
fd7c092e MP |
1887 | static void crypt_status(struct dm_target *ti, status_type_t type, |
1888 | unsigned status_flags, char *result, unsigned maxlen) | |
1da177e4 | 1889 | { |
5ebaee6d | 1890 | struct crypt_config *cc = ti->private; |
fd7c092e | 1891 | unsigned i, sz = 0; |
1da177e4 LT |
1892 | |
1893 | switch (type) { | |
1894 | case STATUSTYPE_INFO: | |
1895 | result[0] = '\0'; | |
1896 | break; | |
1897 | ||
1898 | case STATUSTYPE_TABLE: | |
7dbcd137 | 1899 | DMEMIT("%s ", cc->cipher_string); |
1da177e4 | 1900 | |
fd7c092e MP |
1901 | if (cc->key_size > 0) |
1902 | for (i = 0; i < cc->key_size; i++) | |
1903 | DMEMIT("%02x", cc->key[i]); | |
1904 | else | |
1905 | DMEMIT("-"); | |
1da177e4 | 1906 | |
4ee218cd AM |
1907 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
1908 | cc->dev->name, (unsigned long long)cc->start); | |
772ae5f5 | 1909 | |
55a62eef | 1910 | if (ti->num_discard_bios) |
772ae5f5 MB |
1911 | DMEMIT(" 1 allow_discards"); |
1912 | ||
1da177e4 LT |
1913 | break; |
1914 | } | |
1da177e4 LT |
1915 | } |
1916 | ||
e48d4bbf MB |
1917 | static void crypt_postsuspend(struct dm_target *ti) |
1918 | { | |
1919 | struct crypt_config *cc = ti->private; | |
1920 | ||
1921 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1922 | } | |
1923 | ||
1924 | static int crypt_preresume(struct dm_target *ti) | |
1925 | { | |
1926 | struct crypt_config *cc = ti->private; | |
1927 | ||
1928 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { | |
1929 | DMERR("aborting resume - crypt key is not set."); | |
1930 | return -EAGAIN; | |
1931 | } | |
1932 | ||
1933 | return 0; | |
1934 | } | |
1935 | ||
1936 | static void crypt_resume(struct dm_target *ti) | |
1937 | { | |
1938 | struct crypt_config *cc = ti->private; | |
1939 | ||
1940 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1941 | } | |
1942 | ||
1943 | /* Message interface | |
1944 | * key set <key> | |
1945 | * key wipe | |
1946 | */ | |
1947 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) | |
1948 | { | |
1949 | struct crypt_config *cc = ti->private; | |
542da317 | 1950 | int ret = -EINVAL; |
e48d4bbf MB |
1951 | |
1952 | if (argc < 2) | |
1953 | goto error; | |
1954 | ||
498f0103 | 1955 | if (!strcasecmp(argv[0], "key")) { |
e48d4bbf MB |
1956 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { |
1957 | DMWARN("not suspended during key manipulation."); | |
1958 | return -EINVAL; | |
1959 | } | |
498f0103 | 1960 | if (argc == 3 && !strcasecmp(argv[1], "set")) { |
542da317 MB |
1961 | ret = crypt_set_key(cc, argv[2]); |
1962 | if (ret) | |
1963 | return ret; | |
1964 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) | |
1965 | ret = cc->iv_gen_ops->init(cc); | |
1966 | return ret; | |
1967 | } | |
498f0103 | 1968 | if (argc == 2 && !strcasecmp(argv[1], "wipe")) { |
542da317 MB |
1969 | if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { |
1970 | ret = cc->iv_gen_ops->wipe(cc); | |
1971 | if (ret) | |
1972 | return ret; | |
1973 | } | |
e48d4bbf | 1974 | return crypt_wipe_key(cc); |
542da317 | 1975 | } |
e48d4bbf MB |
1976 | } |
1977 | ||
1978 | error: | |
1979 | DMWARN("unrecognised message received."); | |
1980 | return -EINVAL; | |
1981 | } | |
1982 | ||
d41e26b9 MB |
1983 | static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm, |
1984 | struct bio_vec *biovec, int max_size) | |
1985 | { | |
1986 | struct crypt_config *cc = ti->private; | |
1987 | struct request_queue *q = bdev_get_queue(cc->dev->bdev); | |
1988 | ||
1989 | if (!q->merge_bvec_fn) | |
1990 | return max_size; | |
1991 | ||
1992 | bvm->bi_bdev = cc->dev->bdev; | |
b441a262 | 1993 | bvm->bi_sector = cc->start + dm_target_offset(ti, bvm->bi_sector); |
d41e26b9 MB |
1994 | |
1995 | return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); | |
1996 | } | |
1997 | ||
af4874e0 MS |
1998 | static int crypt_iterate_devices(struct dm_target *ti, |
1999 | iterate_devices_callout_fn fn, void *data) | |
2000 | { | |
2001 | struct crypt_config *cc = ti->private; | |
2002 | ||
5dea271b | 2003 | return fn(ti, cc->dev, cc->start, ti->len, data); |
af4874e0 MS |
2004 | } |
2005 | ||
1da177e4 LT |
2006 | static struct target_type crypt_target = { |
2007 | .name = "crypt", | |
ed04d981 | 2008 | .version = {1, 13, 0}, |
1da177e4 LT |
2009 | .module = THIS_MODULE, |
2010 | .ctr = crypt_ctr, | |
2011 | .dtr = crypt_dtr, | |
2012 | .map = crypt_map, | |
2013 | .status = crypt_status, | |
e48d4bbf MB |
2014 | .postsuspend = crypt_postsuspend, |
2015 | .preresume = crypt_preresume, | |
2016 | .resume = crypt_resume, | |
2017 | .message = crypt_message, | |
d41e26b9 | 2018 | .merge = crypt_merge, |
af4874e0 | 2019 | .iterate_devices = crypt_iterate_devices, |
1da177e4 LT |
2020 | }; |
2021 | ||
2022 | static int __init dm_crypt_init(void) | |
2023 | { | |
2024 | int r; | |
2025 | ||
028867ac | 2026 | _crypt_io_pool = KMEM_CACHE(dm_crypt_io, 0); |
1da177e4 LT |
2027 | if (!_crypt_io_pool) |
2028 | return -ENOMEM; | |
2029 | ||
1da177e4 LT |
2030 | r = dm_register_target(&crypt_target); |
2031 | if (r < 0) { | |
72d94861 | 2032 | DMERR("register failed %d", r); |
9934a8be | 2033 | kmem_cache_destroy(_crypt_io_pool); |
1da177e4 LT |
2034 | } |
2035 | ||
1da177e4 LT |
2036 | return r; |
2037 | } | |
2038 | ||
2039 | static void __exit dm_crypt_exit(void) | |
2040 | { | |
10d3bd09 | 2041 | dm_unregister_target(&crypt_target); |
1da177e4 LT |
2042 | kmem_cache_destroy(_crypt_io_pool); |
2043 | } | |
2044 | ||
2045 | module_init(dm_crypt_init); | |
2046 | module_exit(dm_crypt_exit); | |
2047 | ||
2048 | MODULE_AUTHOR("Christophe Saout <christophe@saout.de>"); | |
2049 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); | |
2050 | MODULE_LICENSE("GPL"); |