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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; |
393b47ef | 61 | struct dm_crypt_io *base_io; |
298a9fa0 | 62 | } CRYPTO_MINALIGN_ATTR; |
53017030 | 63 | |
01482b76 | 64 | struct dm_crypt_request { |
b2174eeb | 65 | struct convert_context *ctx; |
01482b76 MB |
66 | struct scatterlist sg_in; |
67 | struct scatterlist sg_out; | |
2dc5327d | 68 | sector_t iv_sector; |
01482b76 MB |
69 | }; |
70 | ||
1da177e4 LT |
71 | struct crypt_config; |
72 | ||
73 | struct crypt_iv_operations { | |
74 | int (*ctr)(struct crypt_config *cc, struct dm_target *ti, | |
d469f841 | 75 | const char *opts); |
1da177e4 | 76 | void (*dtr)(struct crypt_config *cc); |
b95bf2d3 | 77 | int (*init)(struct crypt_config *cc); |
542da317 | 78 | int (*wipe)(struct crypt_config *cc); |
2dc5327d MB |
79 | int (*generator)(struct crypt_config *cc, u8 *iv, |
80 | struct dm_crypt_request *dmreq); | |
81 | int (*post)(struct crypt_config *cc, u8 *iv, | |
82 | struct dm_crypt_request *dmreq); | |
1da177e4 LT |
83 | }; |
84 | ||
60473592 | 85 | struct iv_essiv_private { |
b95bf2d3 MB |
86 | struct crypto_hash *hash_tfm; |
87 | u8 *salt; | |
60473592 MB |
88 | }; |
89 | ||
90 | struct iv_benbi_private { | |
91 | int shift; | |
92 | }; | |
93 | ||
34745785 MB |
94 | #define LMK_SEED_SIZE 64 /* hash + 0 */ |
95 | struct iv_lmk_private { | |
96 | struct crypto_shash *hash_tfm; | |
97 | u8 *seed; | |
98 | }; | |
99 | ||
ed04d981 MB |
100 | #define TCW_WHITENING_SIZE 16 |
101 | struct iv_tcw_private { | |
102 | struct crypto_shash *crc32_tfm; | |
103 | u8 *iv_seed; | |
104 | u8 *whitening; | |
105 | }; | |
106 | ||
1da177e4 LT |
107 | /* |
108 | * Crypt: maps a linear range of a block device | |
109 | * and encrypts / decrypts at the same time. | |
110 | */ | |
e48d4bbf | 111 | enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID }; |
c0297721 AK |
112 | |
113 | /* | |
610f2de3 | 114 | * The fields in here must be read only after initialization. |
c0297721 | 115 | */ |
1da177e4 LT |
116 | struct crypt_config { |
117 | struct dm_dev *dev; | |
118 | sector_t start; | |
119 | ||
120 | /* | |
ddd42edf MB |
121 | * pool for per bio private data, crypto requests and |
122 | * encryption requeusts/buffer pages | |
1da177e4 LT |
123 | */ |
124 | mempool_t *io_pool; | |
ddd42edf | 125 | mempool_t *req_pool; |
1da177e4 | 126 | mempool_t *page_pool; |
6a24c718 | 127 | struct bio_set *bs; |
1da177e4 | 128 | |
cabf08e4 MB |
129 | struct workqueue_struct *io_queue; |
130 | struct workqueue_struct *crypt_queue; | |
3f1e9070 | 131 | |
5ebaee6d | 132 | char *cipher; |
7dbcd137 | 133 | char *cipher_string; |
5ebaee6d | 134 | |
1da177e4 | 135 | struct crypt_iv_operations *iv_gen_ops; |
79066ad3 | 136 | union { |
60473592 MB |
137 | struct iv_essiv_private essiv; |
138 | struct iv_benbi_private benbi; | |
34745785 | 139 | struct iv_lmk_private lmk; |
ed04d981 | 140 | struct iv_tcw_private tcw; |
79066ad3 | 141 | } iv_gen_private; |
1da177e4 LT |
142 | sector_t iv_offset; |
143 | unsigned int iv_size; | |
144 | ||
fd2d231f MP |
145 | /* ESSIV: struct crypto_cipher *essiv_tfm */ |
146 | void *iv_private; | |
147 | struct crypto_ablkcipher **tfms; | |
d1f96423 | 148 | unsigned tfms_count; |
c0297721 | 149 | |
ddd42edf MB |
150 | /* |
151 | * Layout of each crypto request: | |
152 | * | |
153 | * struct ablkcipher_request | |
154 | * context | |
155 | * padding | |
156 | * struct dm_crypt_request | |
157 | * padding | |
158 | * IV | |
159 | * | |
160 | * The padding is added so that dm_crypt_request and the IV are | |
161 | * correctly aligned. | |
162 | */ | |
163 | unsigned int dmreq_start; | |
ddd42edf | 164 | |
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 | #define MIN_POOL_PAGES 32 |
1da177e4 | 176 | |
e18b890b | 177 | static struct kmem_cache *_crypt_io_pool; |
1da177e4 | 178 | |
028867ac | 179 | static void clone_init(struct dm_crypt_io *, struct bio *); |
395b167c | 180 | static void kcryptd_queue_crypt(struct dm_crypt_io *io); |
2dc5327d | 181 | static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq); |
027581f3 | 182 | |
c0297721 AK |
183 | /* |
184 | * Use this to access cipher attributes that are the same for each CPU. | |
185 | */ | |
186 | static struct crypto_ablkcipher *any_tfm(struct crypt_config *cc) | |
187 | { | |
fd2d231f | 188 | return cc->tfms[0]; |
c0297721 AK |
189 | } |
190 | ||
1da177e4 LT |
191 | /* |
192 | * Different IV generation algorithms: | |
193 | * | |
3c164bd8 | 194 | * plain: the initial vector is the 32-bit little-endian version of the sector |
3a4fa0a2 | 195 | * number, padded with zeros if necessary. |
1da177e4 | 196 | * |
61afef61 MB |
197 | * plain64: the initial vector is the 64-bit little-endian version of the sector |
198 | * number, padded with zeros if necessary. | |
199 | * | |
3c164bd8 RS |
200 | * essiv: "encrypted sector|salt initial vector", the sector number is |
201 | * encrypted with the bulk cipher using a salt as key. The salt | |
202 | * should be derived from the bulk cipher's key via hashing. | |
1da177e4 | 203 | * |
48527fa7 RS |
204 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
205 | * (needed for LRW-32-AES and possible other narrow block modes) | |
206 | * | |
46b47730 LN |
207 | * null: the initial vector is always zero. Provides compatibility with |
208 | * obsolete loop_fish2 devices. Do not use for new devices. | |
209 | * | |
34745785 MB |
210 | * lmk: Compatible implementation of the block chaining mode used |
211 | * by the Loop-AES block device encryption system | |
212 | * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ | |
213 | * It operates on full 512 byte sectors and uses CBC | |
214 | * with an IV derived from the sector number, the data and | |
215 | * optionally extra IV seed. | |
216 | * This means that after decryption the first block | |
217 | * of sector must be tweaked according to decrypted data. | |
218 | * Loop-AES can use three encryption schemes: | |
219 | * version 1: is plain aes-cbc mode | |
220 | * version 2: uses 64 multikey scheme with lmk IV generator | |
221 | * version 3: the same as version 2 with additional IV seed | |
222 | * (it uses 65 keys, last key is used as IV seed) | |
223 | * | |
ed04d981 MB |
224 | * tcw: Compatible implementation of the block chaining mode used |
225 | * by the TrueCrypt device encryption system (prior to version 4.1). | |
226 | * For more info see: http://www.truecrypt.org | |
227 | * It operates on full 512 byte sectors and uses CBC | |
228 | * with an IV derived from initial key and the sector number. | |
229 | * In addition, whitening value is applied on every sector, whitening | |
230 | * is calculated from initial key, sector number and mixed using CRC32. | |
231 | * Note that this encryption scheme is vulnerable to watermarking attacks | |
232 | * and should be used for old compatible containers access only. | |
233 | * | |
1da177e4 LT |
234 | * plumb: unimplemented, see: |
235 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 | |
236 | */ | |
237 | ||
2dc5327d MB |
238 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, |
239 | struct dm_crypt_request *dmreq) | |
1da177e4 LT |
240 | { |
241 | memset(iv, 0, cc->iv_size); | |
283a8328 | 242 | *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); |
1da177e4 LT |
243 | |
244 | return 0; | |
245 | } | |
246 | ||
61afef61 | 247 | static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, |
2dc5327d | 248 | struct dm_crypt_request *dmreq) |
61afef61 MB |
249 | { |
250 | memset(iv, 0, cc->iv_size); | |
283a8328 | 251 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
61afef61 MB |
252 | |
253 | return 0; | |
254 | } | |
255 | ||
b95bf2d3 MB |
256 | /* Initialise ESSIV - compute salt but no local memory allocations */ |
257 | static int crypt_iv_essiv_init(struct crypt_config *cc) | |
258 | { | |
259 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
260 | struct hash_desc desc; | |
261 | struct scatterlist sg; | |
c0297721 | 262 | struct crypto_cipher *essiv_tfm; |
fd2d231f | 263 | int err; |
b95bf2d3 MB |
264 | |
265 | sg_init_one(&sg, cc->key, cc->key_size); | |
266 | desc.tfm = essiv->hash_tfm; | |
267 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
268 | ||
269 | err = crypto_hash_digest(&desc, &sg, cc->key_size, essiv->salt); | |
270 | if (err) | |
271 | return err; | |
272 | ||
fd2d231f | 273 | essiv_tfm = cc->iv_private; |
c0297721 | 274 | |
fd2d231f MP |
275 | err = crypto_cipher_setkey(essiv_tfm, essiv->salt, |
276 | crypto_hash_digestsize(essiv->hash_tfm)); | |
277 | if (err) | |
278 | return err; | |
c0297721 AK |
279 | |
280 | return 0; | |
b95bf2d3 MB |
281 | } |
282 | ||
542da317 MB |
283 | /* Wipe salt and reset key derived from volume key */ |
284 | static int crypt_iv_essiv_wipe(struct crypt_config *cc) | |
285 | { | |
286 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
287 | unsigned salt_size = crypto_hash_digestsize(essiv->hash_tfm); | |
c0297721 | 288 | struct crypto_cipher *essiv_tfm; |
fd2d231f | 289 | int r, err = 0; |
542da317 MB |
290 | |
291 | memset(essiv->salt, 0, salt_size); | |
292 | ||
fd2d231f MP |
293 | essiv_tfm = cc->iv_private; |
294 | r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size); | |
295 | if (r) | |
296 | err = r; | |
c0297721 AK |
297 | |
298 | return err; | |
299 | } | |
300 | ||
301 | /* Set up per cpu cipher state */ | |
302 | static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc, | |
303 | struct dm_target *ti, | |
304 | u8 *salt, unsigned saltsize) | |
305 | { | |
306 | struct crypto_cipher *essiv_tfm; | |
307 | int err; | |
308 | ||
309 | /* Setup the essiv_tfm with the given salt */ | |
310 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); | |
311 | if (IS_ERR(essiv_tfm)) { | |
312 | ti->error = "Error allocating crypto tfm for ESSIV"; | |
313 | return essiv_tfm; | |
314 | } | |
315 | ||
316 | if (crypto_cipher_blocksize(essiv_tfm) != | |
317 | crypto_ablkcipher_ivsize(any_tfm(cc))) { | |
318 | ti->error = "Block size of ESSIV cipher does " | |
319 | "not match IV size of block cipher"; | |
320 | crypto_free_cipher(essiv_tfm); | |
321 | return ERR_PTR(-EINVAL); | |
322 | } | |
323 | ||
324 | err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); | |
325 | if (err) { | |
326 | ti->error = "Failed to set key for ESSIV cipher"; | |
327 | crypto_free_cipher(essiv_tfm); | |
328 | return ERR_PTR(err); | |
329 | } | |
330 | ||
331 | return essiv_tfm; | |
542da317 MB |
332 | } |
333 | ||
60473592 MB |
334 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) |
335 | { | |
c0297721 | 336 | struct crypto_cipher *essiv_tfm; |
60473592 MB |
337 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; |
338 | ||
b95bf2d3 MB |
339 | crypto_free_hash(essiv->hash_tfm); |
340 | essiv->hash_tfm = NULL; | |
341 | ||
342 | kzfree(essiv->salt); | |
343 | essiv->salt = NULL; | |
c0297721 | 344 | |
fd2d231f | 345 | essiv_tfm = cc->iv_private; |
c0297721 | 346 | |
fd2d231f MP |
347 | if (essiv_tfm) |
348 | crypto_free_cipher(essiv_tfm); | |
c0297721 | 349 | |
fd2d231f | 350 | cc->iv_private = NULL; |
60473592 MB |
351 | } |
352 | ||
1da177e4 | 353 | static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, |
d469f841 | 354 | const char *opts) |
1da177e4 | 355 | { |
5861f1be MB |
356 | struct crypto_cipher *essiv_tfm = NULL; |
357 | struct crypto_hash *hash_tfm = NULL; | |
5861f1be | 358 | u8 *salt = NULL; |
fd2d231f | 359 | int err; |
1da177e4 | 360 | |
5861f1be | 361 | if (!opts) { |
72d94861 | 362 | ti->error = "Digest algorithm missing for ESSIV mode"; |
1da177e4 LT |
363 | return -EINVAL; |
364 | } | |
365 | ||
b95bf2d3 | 366 | /* Allocate hash algorithm */ |
35058687 HX |
367 | hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC); |
368 | if (IS_ERR(hash_tfm)) { | |
72d94861 | 369 | ti->error = "Error initializing ESSIV hash"; |
5861f1be MB |
370 | err = PTR_ERR(hash_tfm); |
371 | goto bad; | |
1da177e4 LT |
372 | } |
373 | ||
b95bf2d3 | 374 | salt = kzalloc(crypto_hash_digestsize(hash_tfm), GFP_KERNEL); |
5861f1be | 375 | if (!salt) { |
72d94861 | 376 | ti->error = "Error kmallocing salt storage in ESSIV"; |
5861f1be MB |
377 | err = -ENOMEM; |
378 | goto bad; | |
1da177e4 LT |
379 | } |
380 | ||
b95bf2d3 | 381 | cc->iv_gen_private.essiv.salt = salt; |
b95bf2d3 MB |
382 | cc->iv_gen_private.essiv.hash_tfm = hash_tfm; |
383 | ||
fd2d231f MP |
384 | essiv_tfm = setup_essiv_cpu(cc, ti, salt, |
385 | crypto_hash_digestsize(hash_tfm)); | |
386 | if (IS_ERR(essiv_tfm)) { | |
387 | crypt_iv_essiv_dtr(cc); | |
388 | return PTR_ERR(essiv_tfm); | |
c0297721 | 389 | } |
fd2d231f | 390 | cc->iv_private = essiv_tfm; |
c0297721 | 391 | |
1da177e4 | 392 | return 0; |
5861f1be MB |
393 | |
394 | bad: | |
5861f1be MB |
395 | if (hash_tfm && !IS_ERR(hash_tfm)) |
396 | crypto_free_hash(hash_tfm); | |
b95bf2d3 | 397 | kfree(salt); |
5861f1be | 398 | return err; |
1da177e4 LT |
399 | } |
400 | ||
2dc5327d MB |
401 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, |
402 | struct dm_crypt_request *dmreq) | |
1da177e4 | 403 | { |
fd2d231f | 404 | struct crypto_cipher *essiv_tfm = cc->iv_private; |
c0297721 | 405 | |
1da177e4 | 406 | memset(iv, 0, cc->iv_size); |
283a8328 | 407 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
c0297721 AK |
408 | crypto_cipher_encrypt_one(essiv_tfm, iv, iv); |
409 | ||
1da177e4 LT |
410 | return 0; |
411 | } | |
412 | ||
48527fa7 RS |
413 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
414 | const char *opts) | |
415 | { | |
c0297721 | 416 | unsigned bs = crypto_ablkcipher_blocksize(any_tfm(cc)); |
f0d1b0b3 | 417 | int log = ilog2(bs); |
48527fa7 RS |
418 | |
419 | /* we need to calculate how far we must shift the sector count | |
420 | * to get the cipher block count, we use this shift in _gen */ | |
421 | ||
422 | if (1 << log != bs) { | |
423 | ti->error = "cypher blocksize is not a power of 2"; | |
424 | return -EINVAL; | |
425 | } | |
426 | ||
427 | if (log > 9) { | |
428 | ti->error = "cypher blocksize is > 512"; | |
429 | return -EINVAL; | |
430 | } | |
431 | ||
60473592 | 432 | cc->iv_gen_private.benbi.shift = 9 - log; |
48527fa7 RS |
433 | |
434 | return 0; | |
435 | } | |
436 | ||
437 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) | |
438 | { | |
48527fa7 RS |
439 | } |
440 | ||
2dc5327d MB |
441 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, |
442 | struct dm_crypt_request *dmreq) | |
48527fa7 | 443 | { |
79066ad3 HX |
444 | __be64 val; |
445 | ||
48527fa7 | 446 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
79066ad3 | 447 | |
2dc5327d | 448 | val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); |
79066ad3 | 449 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); |
48527fa7 | 450 | |
1da177e4 LT |
451 | return 0; |
452 | } | |
453 | ||
2dc5327d MB |
454 | static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, |
455 | struct dm_crypt_request *dmreq) | |
46b47730 LN |
456 | { |
457 | memset(iv, 0, cc->iv_size); | |
458 | ||
459 | return 0; | |
460 | } | |
461 | ||
34745785 MB |
462 | static void crypt_iv_lmk_dtr(struct crypt_config *cc) |
463 | { | |
464 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
465 | ||
466 | if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) | |
467 | crypto_free_shash(lmk->hash_tfm); | |
468 | lmk->hash_tfm = NULL; | |
469 | ||
470 | kzfree(lmk->seed); | |
471 | lmk->seed = NULL; | |
472 | } | |
473 | ||
474 | static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, | |
475 | const char *opts) | |
476 | { | |
477 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
478 | ||
479 | lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0); | |
480 | if (IS_ERR(lmk->hash_tfm)) { | |
481 | ti->error = "Error initializing LMK hash"; | |
482 | return PTR_ERR(lmk->hash_tfm); | |
483 | } | |
484 | ||
485 | /* No seed in LMK version 2 */ | |
486 | if (cc->key_parts == cc->tfms_count) { | |
487 | lmk->seed = NULL; | |
488 | return 0; | |
489 | } | |
490 | ||
491 | lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); | |
492 | if (!lmk->seed) { | |
493 | crypt_iv_lmk_dtr(cc); | |
494 | ti->error = "Error kmallocing seed storage in LMK"; | |
495 | return -ENOMEM; | |
496 | } | |
497 | ||
498 | return 0; | |
499 | } | |
500 | ||
501 | static int crypt_iv_lmk_init(struct crypt_config *cc) | |
502 | { | |
503 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
504 | int subkey_size = cc->key_size / cc->key_parts; | |
505 | ||
506 | /* LMK seed is on the position of LMK_KEYS + 1 key */ | |
507 | if (lmk->seed) | |
508 | memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), | |
509 | crypto_shash_digestsize(lmk->hash_tfm)); | |
510 | ||
511 | return 0; | |
512 | } | |
513 | ||
514 | static int crypt_iv_lmk_wipe(struct crypt_config *cc) | |
515 | { | |
516 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
517 | ||
518 | if (lmk->seed) | |
519 | memset(lmk->seed, 0, LMK_SEED_SIZE); | |
520 | ||
521 | return 0; | |
522 | } | |
523 | ||
524 | static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, | |
525 | struct dm_crypt_request *dmreq, | |
526 | u8 *data) | |
527 | { | |
528 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
529 | struct { | |
530 | struct shash_desc desc; | |
531 | char ctx[crypto_shash_descsize(lmk->hash_tfm)]; | |
532 | } sdesc; | |
533 | struct md5_state md5state; | |
da31a078 | 534 | __le32 buf[4]; |
34745785 MB |
535 | int i, r; |
536 | ||
537 | sdesc.desc.tfm = lmk->hash_tfm; | |
538 | sdesc.desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
539 | ||
540 | r = crypto_shash_init(&sdesc.desc); | |
541 | if (r) | |
542 | return r; | |
543 | ||
544 | if (lmk->seed) { | |
545 | r = crypto_shash_update(&sdesc.desc, lmk->seed, LMK_SEED_SIZE); | |
546 | if (r) | |
547 | return r; | |
548 | } | |
549 | ||
550 | /* Sector is always 512B, block size 16, add data of blocks 1-31 */ | |
551 | r = crypto_shash_update(&sdesc.desc, data + 16, 16 * 31); | |
552 | if (r) | |
553 | return r; | |
554 | ||
555 | /* Sector is cropped to 56 bits here */ | |
556 | buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); | |
557 | buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); | |
558 | buf[2] = cpu_to_le32(4024); | |
559 | buf[3] = 0; | |
560 | r = crypto_shash_update(&sdesc.desc, (u8 *)buf, sizeof(buf)); | |
561 | if (r) | |
562 | return r; | |
563 | ||
564 | /* No MD5 padding here */ | |
565 | r = crypto_shash_export(&sdesc.desc, &md5state); | |
566 | if (r) | |
567 | return r; | |
568 | ||
569 | for (i = 0; i < MD5_HASH_WORDS; i++) | |
570 | __cpu_to_le32s(&md5state.hash[i]); | |
571 | memcpy(iv, &md5state.hash, cc->iv_size); | |
572 | ||
573 | return 0; | |
574 | } | |
575 | ||
576 | static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, | |
577 | struct dm_crypt_request *dmreq) | |
578 | { | |
579 | u8 *src; | |
580 | int r = 0; | |
581 | ||
582 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { | |
c2e022cb | 583 | src = kmap_atomic(sg_page(&dmreq->sg_in)); |
34745785 | 584 | r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset); |
c2e022cb | 585 | kunmap_atomic(src); |
34745785 MB |
586 | } else |
587 | memset(iv, 0, cc->iv_size); | |
588 | ||
589 | return r; | |
590 | } | |
591 | ||
592 | static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, | |
593 | struct dm_crypt_request *dmreq) | |
594 | { | |
595 | u8 *dst; | |
596 | int r; | |
597 | ||
598 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) | |
599 | return 0; | |
600 | ||
c2e022cb | 601 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); |
34745785 MB |
602 | r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset); |
603 | ||
604 | /* Tweak the first block of plaintext sector */ | |
605 | if (!r) | |
606 | crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size); | |
607 | ||
c2e022cb | 608 | kunmap_atomic(dst); |
34745785 MB |
609 | return r; |
610 | } | |
611 | ||
ed04d981 MB |
612 | static void crypt_iv_tcw_dtr(struct crypt_config *cc) |
613 | { | |
614 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
615 | ||
616 | kzfree(tcw->iv_seed); | |
617 | tcw->iv_seed = NULL; | |
618 | kzfree(tcw->whitening); | |
619 | tcw->whitening = NULL; | |
620 | ||
621 | if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm)) | |
622 | crypto_free_shash(tcw->crc32_tfm); | |
623 | tcw->crc32_tfm = NULL; | |
624 | } | |
625 | ||
626 | static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti, | |
627 | const char *opts) | |
628 | { | |
629 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
630 | ||
631 | if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) { | |
632 | ti->error = "Wrong key size for TCW"; | |
633 | return -EINVAL; | |
634 | } | |
635 | ||
636 | tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0); | |
637 | if (IS_ERR(tcw->crc32_tfm)) { | |
638 | ti->error = "Error initializing CRC32 in TCW"; | |
639 | return PTR_ERR(tcw->crc32_tfm); | |
640 | } | |
641 | ||
642 | tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL); | |
643 | tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL); | |
644 | if (!tcw->iv_seed || !tcw->whitening) { | |
645 | crypt_iv_tcw_dtr(cc); | |
646 | ti->error = "Error allocating seed storage in TCW"; | |
647 | return -ENOMEM; | |
648 | } | |
649 | ||
650 | return 0; | |
651 | } | |
652 | ||
653 | static int crypt_iv_tcw_init(struct crypt_config *cc) | |
654 | { | |
655 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
656 | int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE; | |
657 | ||
658 | memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size); | |
659 | memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size], | |
660 | TCW_WHITENING_SIZE); | |
661 | ||
662 | return 0; | |
663 | } | |
664 | ||
665 | static int crypt_iv_tcw_wipe(struct crypt_config *cc) | |
666 | { | |
667 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
668 | ||
669 | memset(tcw->iv_seed, 0, cc->iv_size); | |
670 | memset(tcw->whitening, 0, TCW_WHITENING_SIZE); | |
671 | ||
672 | return 0; | |
673 | } | |
674 | ||
675 | static int crypt_iv_tcw_whitening(struct crypt_config *cc, | |
676 | struct dm_crypt_request *dmreq, | |
677 | u8 *data) | |
678 | { | |
679 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
680 | u64 sector = cpu_to_le64((u64)dmreq->iv_sector); | |
681 | u8 buf[TCW_WHITENING_SIZE]; | |
682 | struct { | |
683 | struct shash_desc desc; | |
684 | char ctx[crypto_shash_descsize(tcw->crc32_tfm)]; | |
685 | } sdesc; | |
686 | int i, r; | |
687 | ||
688 | /* xor whitening with sector number */ | |
689 | memcpy(buf, tcw->whitening, TCW_WHITENING_SIZE); | |
690 | crypto_xor(buf, (u8 *)§or, 8); | |
691 | crypto_xor(&buf[8], (u8 *)§or, 8); | |
692 | ||
693 | /* calculate crc32 for every 32bit part and xor it */ | |
694 | sdesc.desc.tfm = tcw->crc32_tfm; | |
695 | sdesc.desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
696 | for (i = 0; i < 4; i++) { | |
697 | r = crypto_shash_init(&sdesc.desc); | |
698 | if (r) | |
699 | goto out; | |
700 | r = crypto_shash_update(&sdesc.desc, &buf[i * 4], 4); | |
701 | if (r) | |
702 | goto out; | |
703 | r = crypto_shash_final(&sdesc.desc, &buf[i * 4]); | |
704 | if (r) | |
705 | goto out; | |
706 | } | |
707 | crypto_xor(&buf[0], &buf[12], 4); | |
708 | crypto_xor(&buf[4], &buf[8], 4); | |
709 | ||
710 | /* apply whitening (8 bytes) to whole sector */ | |
711 | for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++) | |
712 | crypto_xor(data + i * 8, buf, 8); | |
713 | out: | |
714 | memset(buf, 0, sizeof(buf)); | |
715 | return r; | |
716 | } | |
717 | ||
718 | static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, | |
719 | struct dm_crypt_request *dmreq) | |
720 | { | |
721 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
722 | u64 sector = cpu_to_le64((u64)dmreq->iv_sector); | |
723 | u8 *src; | |
724 | int r = 0; | |
725 | ||
726 | /* Remove whitening from ciphertext */ | |
727 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { | |
728 | src = kmap_atomic(sg_page(&dmreq->sg_in)); | |
729 | r = crypt_iv_tcw_whitening(cc, dmreq, src + dmreq->sg_in.offset); | |
730 | kunmap_atomic(src); | |
731 | } | |
732 | ||
733 | /* Calculate IV */ | |
734 | memcpy(iv, tcw->iv_seed, cc->iv_size); | |
735 | crypto_xor(iv, (u8 *)§or, 8); | |
736 | if (cc->iv_size > 8) | |
737 | crypto_xor(&iv[8], (u8 *)§or, cc->iv_size - 8); | |
738 | ||
739 | return r; | |
740 | } | |
741 | ||
742 | static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, | |
743 | struct dm_crypt_request *dmreq) | |
744 | { | |
745 | u8 *dst; | |
746 | int r; | |
747 | ||
748 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) | |
749 | return 0; | |
750 | ||
751 | /* Apply whitening on ciphertext */ | |
752 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); | |
753 | r = crypt_iv_tcw_whitening(cc, dmreq, dst + dmreq->sg_out.offset); | |
754 | kunmap_atomic(dst); | |
755 | ||
756 | return r; | |
757 | } | |
758 | ||
1da177e4 LT |
759 | static struct crypt_iv_operations crypt_iv_plain_ops = { |
760 | .generator = crypt_iv_plain_gen | |
761 | }; | |
762 | ||
61afef61 MB |
763 | static struct crypt_iv_operations crypt_iv_plain64_ops = { |
764 | .generator = crypt_iv_plain64_gen | |
765 | }; | |
766 | ||
1da177e4 LT |
767 | static struct crypt_iv_operations crypt_iv_essiv_ops = { |
768 | .ctr = crypt_iv_essiv_ctr, | |
769 | .dtr = crypt_iv_essiv_dtr, | |
b95bf2d3 | 770 | .init = crypt_iv_essiv_init, |
542da317 | 771 | .wipe = crypt_iv_essiv_wipe, |
1da177e4 LT |
772 | .generator = crypt_iv_essiv_gen |
773 | }; | |
774 | ||
48527fa7 RS |
775 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
776 | .ctr = crypt_iv_benbi_ctr, | |
777 | .dtr = crypt_iv_benbi_dtr, | |
778 | .generator = crypt_iv_benbi_gen | |
779 | }; | |
1da177e4 | 780 | |
46b47730 LN |
781 | static struct crypt_iv_operations crypt_iv_null_ops = { |
782 | .generator = crypt_iv_null_gen | |
783 | }; | |
784 | ||
34745785 MB |
785 | static struct crypt_iv_operations crypt_iv_lmk_ops = { |
786 | .ctr = crypt_iv_lmk_ctr, | |
787 | .dtr = crypt_iv_lmk_dtr, | |
788 | .init = crypt_iv_lmk_init, | |
789 | .wipe = crypt_iv_lmk_wipe, | |
790 | .generator = crypt_iv_lmk_gen, | |
791 | .post = crypt_iv_lmk_post | |
792 | }; | |
793 | ||
ed04d981 MB |
794 | static struct crypt_iv_operations crypt_iv_tcw_ops = { |
795 | .ctr = crypt_iv_tcw_ctr, | |
796 | .dtr = crypt_iv_tcw_dtr, | |
797 | .init = crypt_iv_tcw_init, | |
798 | .wipe = crypt_iv_tcw_wipe, | |
799 | .generator = crypt_iv_tcw_gen, | |
800 | .post = crypt_iv_tcw_post | |
801 | }; | |
802 | ||
d469f841 MB |
803 | static void crypt_convert_init(struct crypt_config *cc, |
804 | struct convert_context *ctx, | |
805 | struct bio *bio_out, struct bio *bio_in, | |
fcd369da | 806 | sector_t sector) |
1da177e4 LT |
807 | { |
808 | ctx->bio_in = bio_in; | |
809 | ctx->bio_out = bio_out; | |
003b5c57 KO |
810 | if (bio_in) |
811 | ctx->iter_in = bio_in->bi_iter; | |
812 | if (bio_out) | |
813 | ctx->iter_out = bio_out->bi_iter; | |
c66029f4 | 814 | ctx->cc_sector = sector + cc->iv_offset; |
43d69034 | 815 | init_completion(&ctx->restart); |
1da177e4 LT |
816 | } |
817 | ||
b2174eeb HY |
818 | static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, |
819 | struct ablkcipher_request *req) | |
820 | { | |
821 | return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); | |
822 | } | |
823 | ||
824 | static struct ablkcipher_request *req_of_dmreq(struct crypt_config *cc, | |
825 | struct dm_crypt_request *dmreq) | |
826 | { | |
827 | return (struct ablkcipher_request *)((char *)dmreq - cc->dmreq_start); | |
828 | } | |
829 | ||
2dc5327d MB |
830 | static u8 *iv_of_dmreq(struct crypt_config *cc, |
831 | struct dm_crypt_request *dmreq) | |
832 | { | |
833 | return (u8 *)ALIGN((unsigned long)(dmreq + 1), | |
834 | crypto_ablkcipher_alignmask(any_tfm(cc)) + 1); | |
835 | } | |
836 | ||
01482b76 | 837 | static int crypt_convert_block(struct crypt_config *cc, |
3a7f6c99 MB |
838 | struct convert_context *ctx, |
839 | struct ablkcipher_request *req) | |
01482b76 | 840 | { |
003b5c57 KO |
841 | struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); |
842 | struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); | |
3a7f6c99 MB |
843 | struct dm_crypt_request *dmreq; |
844 | u8 *iv; | |
40b6229b | 845 | int r; |
3a7f6c99 | 846 | |
b2174eeb | 847 | dmreq = dmreq_of_req(cc, req); |
2dc5327d | 848 | iv = iv_of_dmreq(cc, dmreq); |
01482b76 | 849 | |
c66029f4 | 850 | dmreq->iv_sector = ctx->cc_sector; |
b2174eeb | 851 | dmreq->ctx = ctx; |
3a7f6c99 | 852 | sg_init_table(&dmreq->sg_in, 1); |
003b5c57 KO |
853 | sg_set_page(&dmreq->sg_in, bv_in.bv_page, 1 << SECTOR_SHIFT, |
854 | bv_in.bv_offset); | |
01482b76 | 855 | |
3a7f6c99 | 856 | sg_init_table(&dmreq->sg_out, 1); |
003b5c57 KO |
857 | sg_set_page(&dmreq->sg_out, bv_out.bv_page, 1 << SECTOR_SHIFT, |
858 | bv_out.bv_offset); | |
01482b76 | 859 | |
003b5c57 KO |
860 | bio_advance_iter(ctx->bio_in, &ctx->iter_in, 1 << SECTOR_SHIFT); |
861 | bio_advance_iter(ctx->bio_out, &ctx->iter_out, 1 << SECTOR_SHIFT); | |
01482b76 | 862 | |
3a7f6c99 | 863 | if (cc->iv_gen_ops) { |
2dc5327d | 864 | r = cc->iv_gen_ops->generator(cc, iv, dmreq); |
3a7f6c99 MB |
865 | if (r < 0) |
866 | return r; | |
867 | } | |
868 | ||
869 | ablkcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out, | |
870 | 1 << SECTOR_SHIFT, iv); | |
871 | ||
872 | if (bio_data_dir(ctx->bio_in) == WRITE) | |
873 | r = crypto_ablkcipher_encrypt(req); | |
874 | else | |
875 | r = crypto_ablkcipher_decrypt(req); | |
876 | ||
2dc5327d MB |
877 | if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) |
878 | r = cc->iv_gen_ops->post(cc, iv, dmreq); | |
879 | ||
3a7f6c99 | 880 | return r; |
01482b76 MB |
881 | } |
882 | ||
95497a96 MB |
883 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
884 | int error); | |
c0297721 | 885 | |
ddd42edf MB |
886 | static void crypt_alloc_req(struct crypt_config *cc, |
887 | struct convert_context *ctx) | |
888 | { | |
c66029f4 | 889 | unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1); |
c0297721 | 890 | |
610f2de3 MP |
891 | if (!ctx->req) |
892 | ctx->req = mempool_alloc(cc->req_pool, GFP_NOIO); | |
c0297721 | 893 | |
610f2de3 MP |
894 | ablkcipher_request_set_tfm(ctx->req, cc->tfms[key_index]); |
895 | ablkcipher_request_set_callback(ctx->req, | |
c0297721 | 896 | CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, |
610f2de3 | 897 | kcryptd_async_done, dmreq_of_req(cc, ctx->req)); |
ddd42edf MB |
898 | } |
899 | ||
298a9fa0 MP |
900 | static void crypt_free_req(struct crypt_config *cc, |
901 | struct ablkcipher_request *req, struct bio *base_bio) | |
902 | { | |
903 | struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); | |
904 | ||
905 | if ((struct ablkcipher_request *)(io + 1) != req) | |
906 | mempool_free(req, cc->req_pool); | |
907 | } | |
908 | ||
1da177e4 LT |
909 | /* |
910 | * Encrypt / decrypt data from one bio to another one (can be the same one) | |
911 | */ | |
912 | static int crypt_convert(struct crypt_config *cc, | |
d469f841 | 913 | struct convert_context *ctx) |
1da177e4 | 914 | { |
3f1e9070 | 915 | int r; |
1da177e4 | 916 | |
40b6229b | 917 | atomic_set(&ctx->cc_pending, 1); |
c8081618 | 918 | |
003b5c57 | 919 | while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) { |
1da177e4 | 920 | |
3a7f6c99 MB |
921 | crypt_alloc_req(cc, ctx); |
922 | ||
40b6229b | 923 | atomic_inc(&ctx->cc_pending); |
3f1e9070 | 924 | |
610f2de3 | 925 | r = crypt_convert_block(cc, ctx, ctx->req); |
3a7f6c99 MB |
926 | |
927 | switch (r) { | |
3f1e9070 | 928 | /* async */ |
3a7f6c99 MB |
929 | case -EBUSY: |
930 | wait_for_completion(&ctx->restart); | |
16735d02 | 931 | reinit_completion(&ctx->restart); |
3a7f6c99 MB |
932 | /* fall through*/ |
933 | case -EINPROGRESS: | |
610f2de3 | 934 | ctx->req = NULL; |
c66029f4 | 935 | ctx->cc_sector++; |
3f1e9070 MB |
936 | continue; |
937 | ||
938 | /* sync */ | |
3a7f6c99 | 939 | case 0: |
40b6229b | 940 | atomic_dec(&ctx->cc_pending); |
c66029f4 | 941 | ctx->cc_sector++; |
c7f1b204 | 942 | cond_resched(); |
3a7f6c99 | 943 | continue; |
3a7f6c99 | 944 | |
3f1e9070 MB |
945 | /* error */ |
946 | default: | |
40b6229b | 947 | atomic_dec(&ctx->cc_pending); |
3f1e9070 MB |
948 | return r; |
949 | } | |
1da177e4 LT |
950 | } |
951 | ||
3f1e9070 | 952 | return 0; |
1da177e4 LT |
953 | } |
954 | ||
955 | /* | |
956 | * Generate a new unfragmented bio with the given size | |
957 | * This should never violate the device limitations | |
933f01d4 MB |
958 | * May return a smaller bio when running out of pages, indicated by |
959 | * *out_of_pages set to 1. | |
1da177e4 | 960 | */ |
933f01d4 MB |
961 | static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size, |
962 | unsigned *out_of_pages) | |
1da177e4 | 963 | { |
49a8a920 | 964 | struct crypt_config *cc = io->cc; |
8b004457 | 965 | struct bio *clone; |
1da177e4 | 966 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
b4e3ca1a | 967 | gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM; |
91e10625 MB |
968 | unsigned i, len; |
969 | struct page *page; | |
1da177e4 | 970 | |
2f9941b6 | 971 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
8b004457 | 972 | if (!clone) |
1da177e4 | 973 | return NULL; |
1da177e4 | 974 | |
027581f3 | 975 | clone_init(io, clone); |
933f01d4 | 976 | *out_of_pages = 0; |
6a24c718 | 977 | |
f97380bc | 978 | for (i = 0; i < nr_iovecs; i++) { |
91e10625 | 979 | page = mempool_alloc(cc->page_pool, gfp_mask); |
933f01d4 MB |
980 | if (!page) { |
981 | *out_of_pages = 1; | |
1da177e4 | 982 | break; |
933f01d4 | 983 | } |
1da177e4 LT |
984 | |
985 | /* | |
aeb2deae MP |
986 | * If additional pages cannot be allocated without waiting, |
987 | * return a partially-allocated bio. The caller will then try | |
988 | * to allocate more bios while submitting this partial bio. | |
1da177e4 | 989 | */ |
aeb2deae | 990 | gfp_mask = (gfp_mask | __GFP_NOWARN) & ~__GFP_WAIT; |
1da177e4 | 991 | |
91e10625 MB |
992 | len = (size > PAGE_SIZE) ? PAGE_SIZE : size; |
993 | ||
994 | if (!bio_add_page(clone, page, len, 0)) { | |
995 | mempool_free(page, cc->page_pool); | |
996 | break; | |
997 | } | |
1da177e4 | 998 | |
91e10625 | 999 | size -= len; |
1da177e4 LT |
1000 | } |
1001 | ||
4f024f37 | 1002 | if (!clone->bi_iter.bi_size) { |
8b004457 | 1003 | bio_put(clone); |
1da177e4 LT |
1004 | return NULL; |
1005 | } | |
1006 | ||
8b004457 | 1007 | return clone; |
1da177e4 LT |
1008 | } |
1009 | ||
644bd2f0 | 1010 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) |
1da177e4 | 1011 | { |
644bd2f0 | 1012 | unsigned int i; |
1da177e4 LT |
1013 | struct bio_vec *bv; |
1014 | ||
cb34e057 | 1015 | bio_for_each_segment_all(bv, clone, i) { |
1da177e4 LT |
1016 | BUG_ON(!bv->bv_page); |
1017 | mempool_free(bv->bv_page, cc->page_pool); | |
1018 | bv->bv_page = NULL; | |
1019 | } | |
1020 | } | |
1021 | ||
298a9fa0 MP |
1022 | static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc, |
1023 | struct bio *bio, sector_t sector) | |
dc440d1e | 1024 | { |
49a8a920 | 1025 | io->cc = cc; |
dc440d1e MB |
1026 | io->base_bio = bio; |
1027 | io->sector = sector; | |
1028 | io->error = 0; | |
393b47ef | 1029 | io->base_io = NULL; |
610f2de3 | 1030 | io->ctx.req = NULL; |
40b6229b | 1031 | atomic_set(&io->io_pending, 0); |
dc440d1e MB |
1032 | } |
1033 | ||
3e1a8bdd MB |
1034 | static void crypt_inc_pending(struct dm_crypt_io *io) |
1035 | { | |
40b6229b | 1036 | atomic_inc(&io->io_pending); |
3e1a8bdd MB |
1037 | } |
1038 | ||
1da177e4 LT |
1039 | /* |
1040 | * One of the bios was finished. Check for completion of | |
1041 | * the whole request and correctly clean up the buffer. | |
393b47ef | 1042 | * If base_io is set, wait for the last fragment to complete. |
1da177e4 | 1043 | */ |
5742fd77 | 1044 | static void crypt_dec_pending(struct dm_crypt_io *io) |
1da177e4 | 1045 | { |
49a8a920 | 1046 | struct crypt_config *cc = io->cc; |
b35f8caa MB |
1047 | struct bio *base_bio = io->base_bio; |
1048 | struct dm_crypt_io *base_io = io->base_io; | |
1049 | int error = io->error; | |
1da177e4 | 1050 | |
40b6229b | 1051 | if (!atomic_dec_and_test(&io->io_pending)) |
1da177e4 LT |
1052 | return; |
1053 | ||
610f2de3 | 1054 | if (io->ctx.req) |
298a9fa0 MP |
1055 | crypt_free_req(cc, io->ctx.req, base_bio); |
1056 | if (io != dm_per_bio_data(base_bio, cc->per_bio_data_size)) | |
1057 | mempool_free(io, cc->io_pool); | |
b35f8caa MB |
1058 | |
1059 | if (likely(!base_io)) | |
1060 | bio_endio(base_bio, error); | |
393b47ef | 1061 | else { |
b35f8caa MB |
1062 | if (error && !base_io->error) |
1063 | base_io->error = error; | |
1064 | crypt_dec_pending(base_io); | |
393b47ef | 1065 | } |
1da177e4 LT |
1066 | } |
1067 | ||
1068 | /* | |
cabf08e4 | 1069 | * kcryptd/kcryptd_io: |
1da177e4 LT |
1070 | * |
1071 | * Needed because it would be very unwise to do decryption in an | |
23541d2d | 1072 | * interrupt context. |
cabf08e4 MB |
1073 | * |
1074 | * kcryptd performs the actual encryption or decryption. | |
1075 | * | |
1076 | * kcryptd_io performs the IO submission. | |
1077 | * | |
1078 | * They must be separated as otherwise the final stages could be | |
1079 | * starved by new requests which can block in the first stages due | |
1080 | * to memory allocation. | |
c0297721 AK |
1081 | * |
1082 | * The work is done per CPU global for all dm-crypt instances. | |
1083 | * They should not depend on each other and do not block. | |
1da177e4 | 1084 | */ |
6712ecf8 | 1085 | static void crypt_endio(struct bio *clone, int error) |
8b004457 | 1086 | { |
028867ac | 1087 | struct dm_crypt_io *io = clone->bi_private; |
49a8a920 | 1088 | struct crypt_config *cc = io->cc; |
ee7a491e | 1089 | unsigned rw = bio_data_dir(clone); |
8b004457 | 1090 | |
adfe4770 MB |
1091 | if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error)) |
1092 | error = -EIO; | |
1093 | ||
8b004457 | 1094 | /* |
6712ecf8 | 1095 | * free the processed pages |
8b004457 | 1096 | */ |
ee7a491e | 1097 | if (rw == WRITE) |
644bd2f0 | 1098 | crypt_free_buffer_pages(cc, clone); |
8b004457 MB |
1099 | |
1100 | bio_put(clone); | |
8b004457 | 1101 | |
ee7a491e MB |
1102 | if (rw == READ && !error) { |
1103 | kcryptd_queue_crypt(io); | |
1104 | return; | |
1105 | } | |
5742fd77 MB |
1106 | |
1107 | if (unlikely(error)) | |
1108 | io->error = error; | |
1109 | ||
1110 | crypt_dec_pending(io); | |
8b004457 MB |
1111 | } |
1112 | ||
028867ac | 1113 | static void clone_init(struct dm_crypt_io *io, struct bio *clone) |
8b004457 | 1114 | { |
49a8a920 | 1115 | struct crypt_config *cc = io->cc; |
8b004457 MB |
1116 | |
1117 | clone->bi_private = io; | |
1118 | clone->bi_end_io = crypt_endio; | |
1119 | clone->bi_bdev = cc->dev->bdev; | |
1120 | clone->bi_rw = io->base_bio->bi_rw; | |
1121 | } | |
1122 | ||
20c82538 | 1123 | static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) |
8b004457 | 1124 | { |
49a8a920 | 1125 | struct crypt_config *cc = io->cc; |
8b004457 MB |
1126 | struct bio *base_bio = io->base_bio; |
1127 | struct bio *clone; | |
93e605c2 | 1128 | |
8b004457 MB |
1129 | /* |
1130 | * The block layer might modify the bvec array, so always | |
1131 | * copy the required bvecs because we need the original | |
1132 | * one in order to decrypt the whole bio data *afterwards*. | |
1133 | */ | |
bf800ef1 | 1134 | clone = bio_clone_bioset(base_bio, gfp, cc->bs); |
7eaceacc | 1135 | if (!clone) |
20c82538 | 1136 | return 1; |
8b004457 | 1137 | |
20c82538 MB |
1138 | crypt_inc_pending(io); |
1139 | ||
8b004457 | 1140 | clone_init(io, clone); |
4f024f37 | 1141 | clone->bi_iter.bi_sector = cc->start + io->sector; |
8b004457 | 1142 | |
93e605c2 | 1143 | generic_make_request(clone); |
20c82538 | 1144 | return 0; |
8b004457 MB |
1145 | } |
1146 | ||
4e4eef64 MB |
1147 | static void kcryptd_io_write(struct dm_crypt_io *io) |
1148 | { | |
95497a96 | 1149 | struct bio *clone = io->ctx.bio_out; |
95497a96 | 1150 | generic_make_request(clone); |
4e4eef64 MB |
1151 | } |
1152 | ||
395b167c AK |
1153 | static void kcryptd_io(struct work_struct *work) |
1154 | { | |
1155 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); | |
1156 | ||
20c82538 MB |
1157 | if (bio_data_dir(io->base_bio) == READ) { |
1158 | crypt_inc_pending(io); | |
1159 | if (kcryptd_io_read(io, GFP_NOIO)) | |
1160 | io->error = -ENOMEM; | |
1161 | crypt_dec_pending(io); | |
1162 | } else | |
395b167c AK |
1163 | kcryptd_io_write(io); |
1164 | } | |
1165 | ||
1166 | static void kcryptd_queue_io(struct dm_crypt_io *io) | |
1167 | { | |
49a8a920 | 1168 | struct crypt_config *cc = io->cc; |
395b167c AK |
1169 | |
1170 | INIT_WORK(&io->work, kcryptd_io); | |
1171 | queue_work(cc->io_queue, &io->work); | |
1172 | } | |
1173 | ||
72c6e7af | 1174 | static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) |
4e4eef64 | 1175 | { |
dec1cedf | 1176 | struct bio *clone = io->ctx.bio_out; |
49a8a920 | 1177 | struct crypt_config *cc = io->cc; |
dec1cedf | 1178 | |
72c6e7af | 1179 | if (unlikely(io->error < 0)) { |
dec1cedf MB |
1180 | crypt_free_buffer_pages(cc, clone); |
1181 | bio_put(clone); | |
6c031f41 | 1182 | crypt_dec_pending(io); |
dec1cedf MB |
1183 | return; |
1184 | } | |
1185 | ||
1186 | /* crypt_convert should have filled the clone bio */ | |
003b5c57 | 1187 | BUG_ON(io->ctx.iter_out.bi_size); |
dec1cedf | 1188 | |
4f024f37 | 1189 | clone->bi_iter.bi_sector = cc->start + io->sector; |
899c95d3 | 1190 | |
95497a96 MB |
1191 | if (async) |
1192 | kcryptd_queue_io(io); | |
1e37bb8e | 1193 | else |
95497a96 | 1194 | generic_make_request(clone); |
4e4eef64 MB |
1195 | } |
1196 | ||
fc5a5e9a | 1197 | static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) |
8b004457 | 1198 | { |
49a8a920 | 1199 | struct crypt_config *cc = io->cc; |
8b004457 | 1200 | struct bio *clone; |
393b47ef | 1201 | struct dm_crypt_io *new_io; |
c8081618 | 1202 | int crypt_finished; |
933f01d4 | 1203 | unsigned out_of_pages = 0; |
4f024f37 | 1204 | unsigned remaining = io->base_bio->bi_iter.bi_size; |
b635b00e | 1205 | sector_t sector = io->sector; |
dec1cedf | 1206 | int r; |
8b004457 | 1207 | |
fc5a5e9a MB |
1208 | /* |
1209 | * Prevent io from disappearing until this function completes. | |
1210 | */ | |
1211 | crypt_inc_pending(io); | |
b635b00e | 1212 | crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); |
fc5a5e9a | 1213 | |
93e605c2 MB |
1214 | /* |
1215 | * The allocated buffers can be smaller than the whole bio, | |
1216 | * so repeat the whole process until all the data can be handled. | |
1217 | */ | |
1218 | while (remaining) { | |
933f01d4 | 1219 | clone = crypt_alloc_buffer(io, remaining, &out_of_pages); |
23541d2d | 1220 | if (unlikely(!clone)) { |
5742fd77 | 1221 | io->error = -ENOMEM; |
fc5a5e9a | 1222 | break; |
23541d2d | 1223 | } |
93e605c2 | 1224 | |
53017030 | 1225 | io->ctx.bio_out = clone; |
003b5c57 | 1226 | io->ctx.iter_out = clone->bi_iter; |
93e605c2 | 1227 | |
4f024f37 | 1228 | remaining -= clone->bi_iter.bi_size; |
b635b00e | 1229 | sector += bio_sectors(clone); |
93e605c2 | 1230 | |
4e594098 | 1231 | crypt_inc_pending(io); |
72c6e7af | 1232 | |
dec1cedf | 1233 | r = crypt_convert(cc, &io->ctx); |
72c6e7af MP |
1234 | if (r < 0) |
1235 | io->error = -EIO; | |
1236 | ||
40b6229b | 1237 | crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending); |
f97380bc | 1238 | |
c8081618 MB |
1239 | /* Encryption was already finished, submit io now */ |
1240 | if (crypt_finished) { | |
72c6e7af | 1241 | kcryptd_crypt_write_io_submit(io, 0); |
c8081618 MB |
1242 | |
1243 | /* | |
1244 | * If there was an error, do not try next fragments. | |
1245 | * For async, error is processed in async handler. | |
1246 | */ | |
6c031f41 | 1247 | if (unlikely(r < 0)) |
fc5a5e9a | 1248 | break; |
b635b00e MB |
1249 | |
1250 | io->sector = sector; | |
4e594098 | 1251 | } |
93e605c2 | 1252 | |
933f01d4 MB |
1253 | /* |
1254 | * Out of memory -> run queues | |
1255 | * But don't wait if split was due to the io size restriction | |
1256 | */ | |
1257 | if (unlikely(out_of_pages)) | |
8aa7e847 | 1258 | congestion_wait(BLK_RW_ASYNC, HZ/100); |
933f01d4 | 1259 | |
393b47ef MB |
1260 | /* |
1261 | * With async crypto it is unsafe to share the crypto context | |
1262 | * between fragments, so switch to a new dm_crypt_io structure. | |
1263 | */ | |
1264 | if (unlikely(!crypt_finished && remaining)) { | |
298a9fa0 MP |
1265 | new_io = mempool_alloc(cc->io_pool, GFP_NOIO); |
1266 | crypt_io_init(new_io, io->cc, io->base_bio, sector); | |
393b47ef MB |
1267 | crypt_inc_pending(new_io); |
1268 | crypt_convert_init(cc, &new_io->ctx, NULL, | |
1269 | io->base_bio, sector); | |
003b5c57 | 1270 | new_io->ctx.iter_in = io->ctx.iter_in; |
393b47ef MB |
1271 | |
1272 | /* | |
1273 | * Fragments after the first use the base_io | |
1274 | * pending count. | |
1275 | */ | |
1276 | if (!io->base_io) | |
1277 | new_io->base_io = io; | |
1278 | else { | |
1279 | new_io->base_io = io->base_io; | |
1280 | crypt_inc_pending(io->base_io); | |
1281 | crypt_dec_pending(io); | |
1282 | } | |
1283 | ||
1284 | io = new_io; | |
1285 | } | |
93e605c2 | 1286 | } |
899c95d3 MB |
1287 | |
1288 | crypt_dec_pending(io); | |
84131db6 MB |
1289 | } |
1290 | ||
72c6e7af | 1291 | static void kcryptd_crypt_read_done(struct dm_crypt_io *io) |
5742fd77 | 1292 | { |
5742fd77 MB |
1293 | crypt_dec_pending(io); |
1294 | } | |
1295 | ||
4e4eef64 | 1296 | static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) |
8b004457 | 1297 | { |
49a8a920 | 1298 | struct crypt_config *cc = io->cc; |
5742fd77 | 1299 | int r = 0; |
1da177e4 | 1300 | |
3e1a8bdd | 1301 | crypt_inc_pending(io); |
3a7f6c99 | 1302 | |
53017030 | 1303 | crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, |
0c395b0f | 1304 | io->sector); |
1da177e4 | 1305 | |
5742fd77 | 1306 | r = crypt_convert(cc, &io->ctx); |
72c6e7af MP |
1307 | if (r < 0) |
1308 | io->error = -EIO; | |
5742fd77 | 1309 | |
40b6229b | 1310 | if (atomic_dec_and_test(&io->ctx.cc_pending)) |
72c6e7af | 1311 | kcryptd_crypt_read_done(io); |
3a7f6c99 MB |
1312 | |
1313 | crypt_dec_pending(io); | |
1da177e4 LT |
1314 | } |
1315 | ||
95497a96 MB |
1316 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
1317 | int error) | |
1318 | { | |
b2174eeb HY |
1319 | struct dm_crypt_request *dmreq = async_req->data; |
1320 | struct convert_context *ctx = dmreq->ctx; | |
95497a96 | 1321 | struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); |
49a8a920 | 1322 | struct crypt_config *cc = io->cc; |
95497a96 MB |
1323 | |
1324 | if (error == -EINPROGRESS) { | |
1325 | complete(&ctx->restart); | |
1326 | return; | |
1327 | } | |
1328 | ||
2dc5327d MB |
1329 | if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) |
1330 | error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq); | |
1331 | ||
72c6e7af MP |
1332 | if (error < 0) |
1333 | io->error = -EIO; | |
1334 | ||
298a9fa0 | 1335 | crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio); |
95497a96 | 1336 | |
40b6229b | 1337 | if (!atomic_dec_and_test(&ctx->cc_pending)) |
95497a96 MB |
1338 | return; |
1339 | ||
1340 | if (bio_data_dir(io->base_bio) == READ) | |
72c6e7af | 1341 | kcryptd_crypt_read_done(io); |
95497a96 | 1342 | else |
72c6e7af | 1343 | kcryptd_crypt_write_io_submit(io, 1); |
95497a96 MB |
1344 | } |
1345 | ||
395b167c | 1346 | static void kcryptd_crypt(struct work_struct *work) |
1da177e4 | 1347 | { |
028867ac | 1348 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
8b004457 | 1349 | |
cabf08e4 | 1350 | if (bio_data_dir(io->base_bio) == READ) |
395b167c | 1351 | kcryptd_crypt_read_convert(io); |
4e4eef64 | 1352 | else |
395b167c | 1353 | kcryptd_crypt_write_convert(io); |
cabf08e4 MB |
1354 | } |
1355 | ||
395b167c | 1356 | static void kcryptd_queue_crypt(struct dm_crypt_io *io) |
cabf08e4 | 1357 | { |
49a8a920 | 1358 | struct crypt_config *cc = io->cc; |
cabf08e4 | 1359 | |
395b167c AK |
1360 | INIT_WORK(&io->work, kcryptd_crypt); |
1361 | queue_work(cc->crypt_queue, &io->work); | |
1da177e4 LT |
1362 | } |
1363 | ||
1364 | /* | |
1365 | * Decode key from its hex representation | |
1366 | */ | |
1367 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) | |
1368 | { | |
1369 | char buffer[3]; | |
1da177e4 LT |
1370 | unsigned int i; |
1371 | ||
1372 | buffer[2] = '\0'; | |
1373 | ||
8b004457 | 1374 | for (i = 0; i < size; i++) { |
1da177e4 LT |
1375 | buffer[0] = *hex++; |
1376 | buffer[1] = *hex++; | |
1377 | ||
1a66a08a | 1378 | if (kstrtou8(buffer, 16, &key[i])) |
1da177e4 LT |
1379 | return -EINVAL; |
1380 | } | |
1381 | ||
1382 | if (*hex != '\0') | |
1383 | return -EINVAL; | |
1384 | ||
1385 | return 0; | |
1386 | } | |
1387 | ||
fd2d231f | 1388 | static void crypt_free_tfms(struct crypt_config *cc) |
d1f96423 | 1389 | { |
d1f96423 MB |
1390 | unsigned i; |
1391 | ||
fd2d231f MP |
1392 | if (!cc->tfms) |
1393 | return; | |
1394 | ||
d1f96423 | 1395 | for (i = 0; i < cc->tfms_count; i++) |
fd2d231f MP |
1396 | if (cc->tfms[i] && !IS_ERR(cc->tfms[i])) { |
1397 | crypto_free_ablkcipher(cc->tfms[i]); | |
1398 | cc->tfms[i] = NULL; | |
d1f96423 | 1399 | } |
fd2d231f MP |
1400 | |
1401 | kfree(cc->tfms); | |
1402 | cc->tfms = NULL; | |
d1f96423 MB |
1403 | } |
1404 | ||
fd2d231f | 1405 | static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) |
d1f96423 | 1406 | { |
d1f96423 MB |
1407 | unsigned i; |
1408 | int err; | |
1409 | ||
fd2d231f MP |
1410 | cc->tfms = kmalloc(cc->tfms_count * sizeof(struct crypto_ablkcipher *), |
1411 | GFP_KERNEL); | |
1412 | if (!cc->tfms) | |
1413 | return -ENOMEM; | |
1414 | ||
d1f96423 | 1415 | for (i = 0; i < cc->tfms_count; i++) { |
fd2d231f MP |
1416 | cc->tfms[i] = crypto_alloc_ablkcipher(ciphermode, 0, 0); |
1417 | if (IS_ERR(cc->tfms[i])) { | |
1418 | err = PTR_ERR(cc->tfms[i]); | |
1419 | crypt_free_tfms(cc); | |
d1f96423 MB |
1420 | return err; |
1421 | } | |
1422 | } | |
1423 | ||
1424 | return 0; | |
1425 | } | |
1426 | ||
c0297721 AK |
1427 | static int crypt_setkey_allcpus(struct crypt_config *cc) |
1428 | { | |
da31a078 | 1429 | unsigned subkey_size; |
fd2d231f MP |
1430 | int err = 0, i, r; |
1431 | ||
da31a078 MB |
1432 | /* Ignore extra keys (which are used for IV etc) */ |
1433 | subkey_size = (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); | |
1434 | ||
fd2d231f MP |
1435 | for (i = 0; i < cc->tfms_count; i++) { |
1436 | r = crypto_ablkcipher_setkey(cc->tfms[i], | |
1437 | cc->key + (i * subkey_size), | |
1438 | subkey_size); | |
1439 | if (r) | |
1440 | err = r; | |
c0297721 AK |
1441 | } |
1442 | ||
1443 | return err; | |
1444 | } | |
1445 | ||
e48d4bbf MB |
1446 | static int crypt_set_key(struct crypt_config *cc, char *key) |
1447 | { | |
de8be5ac MB |
1448 | int r = -EINVAL; |
1449 | int key_string_len = strlen(key); | |
1450 | ||
69a8cfcd | 1451 | /* The key size may not be changed. */ |
de8be5ac MB |
1452 | if (cc->key_size != (key_string_len >> 1)) |
1453 | goto out; | |
e48d4bbf | 1454 | |
69a8cfcd MB |
1455 | /* Hyphen (which gives a key_size of zero) means there is no key. */ |
1456 | if (!cc->key_size && strcmp(key, "-")) | |
de8be5ac | 1457 | goto out; |
e48d4bbf | 1458 | |
69a8cfcd | 1459 | if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0) |
de8be5ac | 1460 | goto out; |
e48d4bbf MB |
1461 | |
1462 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1463 | ||
de8be5ac MB |
1464 | r = crypt_setkey_allcpus(cc); |
1465 | ||
1466 | out: | |
1467 | /* Hex key string not needed after here, so wipe it. */ | |
1468 | memset(key, '0', key_string_len); | |
1469 | ||
1470 | return r; | |
e48d4bbf MB |
1471 | } |
1472 | ||
1473 | static int crypt_wipe_key(struct crypt_config *cc) | |
1474 | { | |
1475 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1476 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); | |
c0297721 AK |
1477 | |
1478 | return crypt_setkey_allcpus(cc); | |
e48d4bbf MB |
1479 | } |
1480 | ||
28513fcc MB |
1481 | static void crypt_dtr(struct dm_target *ti) |
1482 | { | |
1483 | struct crypt_config *cc = ti->private; | |
1484 | ||
1485 | ti->private = NULL; | |
1486 | ||
1487 | if (!cc) | |
1488 | return; | |
1489 | ||
1490 | if (cc->io_queue) | |
1491 | destroy_workqueue(cc->io_queue); | |
1492 | if (cc->crypt_queue) | |
1493 | destroy_workqueue(cc->crypt_queue); | |
1494 | ||
fd2d231f MP |
1495 | crypt_free_tfms(cc); |
1496 | ||
28513fcc MB |
1497 | if (cc->bs) |
1498 | bioset_free(cc->bs); | |
1499 | ||
1500 | if (cc->page_pool) | |
1501 | mempool_destroy(cc->page_pool); | |
1502 | if (cc->req_pool) | |
1503 | mempool_destroy(cc->req_pool); | |
1504 | if (cc->io_pool) | |
1505 | mempool_destroy(cc->io_pool); | |
1506 | ||
1507 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) | |
1508 | cc->iv_gen_ops->dtr(cc); | |
1509 | ||
28513fcc MB |
1510 | if (cc->dev) |
1511 | dm_put_device(ti, cc->dev); | |
1512 | ||
5ebaee6d | 1513 | kzfree(cc->cipher); |
7dbcd137 | 1514 | kzfree(cc->cipher_string); |
28513fcc MB |
1515 | |
1516 | /* Must zero key material before freeing */ | |
1517 | kzfree(cc); | |
1518 | } | |
1519 | ||
5ebaee6d MB |
1520 | static int crypt_ctr_cipher(struct dm_target *ti, |
1521 | char *cipher_in, char *key) | |
1da177e4 | 1522 | { |
5ebaee6d | 1523 | struct crypt_config *cc = ti->private; |
d1f96423 | 1524 | char *tmp, *cipher, *chainmode, *ivmode, *ivopts, *keycount; |
5ebaee6d | 1525 | char *cipher_api = NULL; |
fd2d231f | 1526 | int ret = -EINVAL; |
31998ef1 | 1527 | char dummy; |
1da177e4 | 1528 | |
5ebaee6d MB |
1529 | /* Convert to crypto api definition? */ |
1530 | if (strchr(cipher_in, '(')) { | |
1531 | ti->error = "Bad cipher specification"; | |
1da177e4 LT |
1532 | return -EINVAL; |
1533 | } | |
1534 | ||
7dbcd137 MB |
1535 | cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); |
1536 | if (!cc->cipher_string) | |
1537 | goto bad_mem; | |
1538 | ||
5ebaee6d MB |
1539 | /* |
1540 | * Legacy dm-crypt cipher specification | |
d1f96423 | 1541 | * cipher[:keycount]-mode-iv:ivopts |
5ebaee6d MB |
1542 | */ |
1543 | tmp = cipher_in; | |
d1f96423 MB |
1544 | keycount = strsep(&tmp, "-"); |
1545 | cipher = strsep(&keycount, ":"); | |
1546 | ||
1547 | if (!keycount) | |
1548 | cc->tfms_count = 1; | |
31998ef1 | 1549 | else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || |
d1f96423 MB |
1550 | !is_power_of_2(cc->tfms_count)) { |
1551 | ti->error = "Bad cipher key count specification"; | |
1552 | return -EINVAL; | |
1553 | } | |
1554 | cc->key_parts = cc->tfms_count; | |
da31a078 | 1555 | cc->key_extra_size = 0; |
5ebaee6d MB |
1556 | |
1557 | cc->cipher = kstrdup(cipher, GFP_KERNEL); | |
1558 | if (!cc->cipher) | |
1559 | goto bad_mem; | |
1560 | ||
1da177e4 LT |
1561 | chainmode = strsep(&tmp, "-"); |
1562 | ivopts = strsep(&tmp, "-"); | |
1563 | ivmode = strsep(&ivopts, ":"); | |
1564 | ||
1565 | if (tmp) | |
5ebaee6d | 1566 | DMWARN("Ignoring unexpected additional cipher options"); |
1da177e4 | 1567 | |
7dbcd137 MB |
1568 | /* |
1569 | * For compatibility with the original dm-crypt mapping format, if | |
1570 | * only the cipher name is supplied, use cbc-plain. | |
1571 | */ | |
5ebaee6d | 1572 | if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) { |
1da177e4 LT |
1573 | chainmode = "cbc"; |
1574 | ivmode = "plain"; | |
1575 | } | |
1576 | ||
d1806f6a | 1577 | if (strcmp(chainmode, "ecb") && !ivmode) { |
5ebaee6d MB |
1578 | ti->error = "IV mechanism required"; |
1579 | return -EINVAL; | |
1da177e4 LT |
1580 | } |
1581 | ||
5ebaee6d MB |
1582 | cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); |
1583 | if (!cipher_api) | |
1584 | goto bad_mem; | |
1585 | ||
1586 | ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, | |
1587 | "%s(%s)", chainmode, cipher); | |
1588 | if (ret < 0) { | |
1589 | kfree(cipher_api); | |
1590 | goto bad_mem; | |
1da177e4 LT |
1591 | } |
1592 | ||
5ebaee6d | 1593 | /* Allocate cipher */ |
fd2d231f MP |
1594 | ret = crypt_alloc_tfms(cc, cipher_api); |
1595 | if (ret < 0) { | |
1596 | ti->error = "Error allocating crypto tfm"; | |
1597 | goto bad; | |
1da177e4 | 1598 | } |
1da177e4 | 1599 | |
5ebaee6d | 1600 | /* Initialize IV */ |
c0297721 | 1601 | cc->iv_size = crypto_ablkcipher_ivsize(any_tfm(cc)); |
5ebaee6d MB |
1602 | if (cc->iv_size) |
1603 | /* at least a 64 bit sector number should fit in our buffer */ | |
1604 | cc->iv_size = max(cc->iv_size, | |
1605 | (unsigned int)(sizeof(u64) / sizeof(u8))); | |
1606 | else if (ivmode) { | |
1607 | DMWARN("Selected cipher does not support IVs"); | |
1608 | ivmode = NULL; | |
1609 | } | |
1610 | ||
1611 | /* Choose ivmode, see comments at iv code. */ | |
1da177e4 LT |
1612 | if (ivmode == NULL) |
1613 | cc->iv_gen_ops = NULL; | |
1614 | else if (strcmp(ivmode, "plain") == 0) | |
1615 | cc->iv_gen_ops = &crypt_iv_plain_ops; | |
61afef61 MB |
1616 | else if (strcmp(ivmode, "plain64") == 0) |
1617 | cc->iv_gen_ops = &crypt_iv_plain64_ops; | |
1da177e4 LT |
1618 | else if (strcmp(ivmode, "essiv") == 0) |
1619 | cc->iv_gen_ops = &crypt_iv_essiv_ops; | |
48527fa7 RS |
1620 | else if (strcmp(ivmode, "benbi") == 0) |
1621 | cc->iv_gen_ops = &crypt_iv_benbi_ops; | |
46b47730 LN |
1622 | else if (strcmp(ivmode, "null") == 0) |
1623 | cc->iv_gen_ops = &crypt_iv_null_ops; | |
34745785 MB |
1624 | else if (strcmp(ivmode, "lmk") == 0) { |
1625 | cc->iv_gen_ops = &crypt_iv_lmk_ops; | |
ed04d981 MB |
1626 | /* |
1627 | * Version 2 and 3 is recognised according | |
34745785 MB |
1628 | * to length of provided multi-key string. |
1629 | * If present (version 3), last key is used as IV seed. | |
ed04d981 | 1630 | * All keys (including IV seed) are always the same size. |
34745785 | 1631 | */ |
da31a078 | 1632 | if (cc->key_size % cc->key_parts) { |
34745785 | 1633 | cc->key_parts++; |
da31a078 MB |
1634 | cc->key_extra_size = cc->key_size / cc->key_parts; |
1635 | } | |
ed04d981 MB |
1636 | } else if (strcmp(ivmode, "tcw") == 0) { |
1637 | cc->iv_gen_ops = &crypt_iv_tcw_ops; | |
1638 | cc->key_parts += 2; /* IV + whitening */ | |
1639 | cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; | |
34745785 | 1640 | } else { |
5ebaee6d | 1641 | ret = -EINVAL; |
72d94861 | 1642 | ti->error = "Invalid IV mode"; |
28513fcc | 1643 | goto bad; |
1da177e4 LT |
1644 | } |
1645 | ||
da31a078 MB |
1646 | /* Initialize and set key */ |
1647 | ret = crypt_set_key(cc, key); | |
1648 | if (ret < 0) { | |
1649 | ti->error = "Error decoding and setting key"; | |
1650 | goto bad; | |
1651 | } | |
1652 | ||
28513fcc MB |
1653 | /* Allocate IV */ |
1654 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { | |
1655 | ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); | |
1656 | if (ret < 0) { | |
1657 | ti->error = "Error creating IV"; | |
1658 | goto bad; | |
1659 | } | |
1660 | } | |
1da177e4 | 1661 | |
28513fcc MB |
1662 | /* Initialize IV (set keys for ESSIV etc) */ |
1663 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) { | |
1664 | ret = cc->iv_gen_ops->init(cc); | |
1665 | if (ret < 0) { | |
1666 | ti->error = "Error initialising IV"; | |
1667 | goto bad; | |
1668 | } | |
b95bf2d3 MB |
1669 | } |
1670 | ||
5ebaee6d MB |
1671 | ret = 0; |
1672 | bad: | |
1673 | kfree(cipher_api); | |
1674 | return ret; | |
1675 | ||
1676 | bad_mem: | |
1677 | ti->error = "Cannot allocate cipher strings"; | |
1678 | return -ENOMEM; | |
1679 | } | |
1680 | ||
1681 | /* | |
1682 | * Construct an encryption mapping: | |
1683 | * <cipher> <key> <iv_offset> <dev_path> <start> | |
1684 | */ | |
1685 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
1686 | { | |
1687 | struct crypt_config *cc; | |
772ae5f5 | 1688 | unsigned int key_size, opt_params; |
5ebaee6d MB |
1689 | unsigned long long tmpll; |
1690 | int ret; | |
d49ec52f | 1691 | size_t iv_size_padding; |
772ae5f5 MB |
1692 | struct dm_arg_set as; |
1693 | const char *opt_string; | |
31998ef1 | 1694 | char dummy; |
772ae5f5 MB |
1695 | |
1696 | static struct dm_arg _args[] = { | |
1697 | {0, 1, "Invalid number of feature args"}, | |
1698 | }; | |
5ebaee6d | 1699 | |
772ae5f5 | 1700 | if (argc < 5) { |
5ebaee6d MB |
1701 | ti->error = "Not enough arguments"; |
1702 | return -EINVAL; | |
1da177e4 LT |
1703 | } |
1704 | ||
5ebaee6d MB |
1705 | key_size = strlen(argv[1]) >> 1; |
1706 | ||
1707 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); | |
1708 | if (!cc) { | |
1709 | ti->error = "Cannot allocate encryption context"; | |
1710 | return -ENOMEM; | |
1711 | } | |
69a8cfcd | 1712 | cc->key_size = key_size; |
5ebaee6d MB |
1713 | |
1714 | ti->private = cc; | |
1715 | ret = crypt_ctr_cipher(ti, argv[0], argv[1]); | |
1716 | if (ret < 0) | |
1717 | goto bad; | |
1718 | ||
28513fcc | 1719 | ret = -ENOMEM; |
93d2341c | 1720 | cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool); |
1da177e4 | 1721 | if (!cc->io_pool) { |
72d94861 | 1722 | ti->error = "Cannot allocate crypt io mempool"; |
28513fcc | 1723 | goto bad; |
1da177e4 LT |
1724 | } |
1725 | ||
ddd42edf | 1726 | cc->dmreq_start = sizeof(struct ablkcipher_request); |
c0297721 | 1727 | cc->dmreq_start += crypto_ablkcipher_reqsize(any_tfm(cc)); |
d49ec52f MP |
1728 | cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request)); |
1729 | ||
1730 | if (crypto_ablkcipher_alignmask(any_tfm(cc)) < CRYPTO_MINALIGN) { | |
1731 | /* Allocate the padding exactly */ | |
1732 | iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request)) | |
1733 | & crypto_ablkcipher_alignmask(any_tfm(cc)); | |
1734 | } else { | |
1735 | /* | |
1736 | * If the cipher requires greater alignment than kmalloc | |
1737 | * alignment, we don't know the exact position of the | |
1738 | * initialization vector. We must assume worst case. | |
1739 | */ | |
1740 | iv_size_padding = crypto_ablkcipher_alignmask(any_tfm(cc)); | |
1741 | } | |
ddd42edf MB |
1742 | |
1743 | cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + | |
d49ec52f | 1744 | sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size); |
ddd42edf MB |
1745 | if (!cc->req_pool) { |
1746 | ti->error = "Cannot allocate crypt request mempool"; | |
28513fcc | 1747 | goto bad; |
ddd42edf | 1748 | } |
ddd42edf | 1749 | |
298a9fa0 | 1750 | cc->per_bio_data_size = ti->per_bio_data_size = |
d49ec52f MP |
1751 | ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + |
1752 | sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size, | |
1753 | ARCH_KMALLOC_MINALIGN); | |
298a9fa0 | 1754 | |
a19b27ce | 1755 | cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0); |
1da177e4 | 1756 | if (!cc->page_pool) { |
72d94861 | 1757 | ti->error = "Cannot allocate page mempool"; |
28513fcc | 1758 | goto bad; |
1da177e4 LT |
1759 | } |
1760 | ||
bb799ca0 | 1761 | cc->bs = bioset_create(MIN_IOS, 0); |
6a24c718 MB |
1762 | if (!cc->bs) { |
1763 | ti->error = "Cannot allocate crypt bioset"; | |
28513fcc | 1764 | goto bad; |
6a24c718 MB |
1765 | } |
1766 | ||
28513fcc | 1767 | ret = -EINVAL; |
31998ef1 | 1768 | if (sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1769 | ti->error = "Invalid iv_offset sector"; |
28513fcc | 1770 | goto bad; |
1da177e4 | 1771 | } |
4ee218cd | 1772 | cc->iv_offset = tmpll; |
1da177e4 | 1773 | |
28513fcc MB |
1774 | if (dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev)) { |
1775 | ti->error = "Device lookup failed"; | |
1776 | goto bad; | |
1777 | } | |
1778 | ||
31998ef1 | 1779 | if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1780 | ti->error = "Invalid device sector"; |
28513fcc | 1781 | goto bad; |
1da177e4 | 1782 | } |
4ee218cd | 1783 | cc->start = tmpll; |
1da177e4 | 1784 | |
772ae5f5 MB |
1785 | argv += 5; |
1786 | argc -= 5; | |
1787 | ||
1788 | /* Optional parameters */ | |
1789 | if (argc) { | |
1790 | as.argc = argc; | |
1791 | as.argv = argv; | |
1792 | ||
1793 | ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); | |
1794 | if (ret) | |
1795 | goto bad; | |
1796 | ||
1797 | opt_string = dm_shift_arg(&as); | |
1798 | ||
1799 | if (opt_params == 1 && opt_string && | |
1800 | !strcasecmp(opt_string, "allow_discards")) | |
55a62eef | 1801 | ti->num_discard_bios = 1; |
772ae5f5 MB |
1802 | else if (opt_params) { |
1803 | ret = -EINVAL; | |
1804 | ti->error = "Invalid feature arguments"; | |
1805 | goto bad; | |
1806 | } | |
1807 | } | |
1808 | ||
28513fcc | 1809 | ret = -ENOMEM; |
670368a8 | 1810 | cc->io_queue = alloc_workqueue("kcryptd_io", WQ_MEM_RECLAIM, 1); |
cabf08e4 MB |
1811 | if (!cc->io_queue) { |
1812 | ti->error = "Couldn't create kcryptd io queue"; | |
28513fcc | 1813 | goto bad; |
cabf08e4 MB |
1814 | } |
1815 | ||
c0297721 | 1816 | cc->crypt_queue = alloc_workqueue("kcryptd", |
670368a8 | 1817 | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1); |
cabf08e4 | 1818 | if (!cc->crypt_queue) { |
9934a8be | 1819 | ti->error = "Couldn't create kcryptd queue"; |
28513fcc | 1820 | goto bad; |
9934a8be MB |
1821 | } |
1822 | ||
55a62eef | 1823 | ti->num_flush_bios = 1; |
0ac55489 | 1824 | ti->discard_zeroes_data_unsupported = true; |
983c7db3 | 1825 | |
1da177e4 LT |
1826 | return 0; |
1827 | ||
28513fcc MB |
1828 | bad: |
1829 | crypt_dtr(ti); | |
1830 | return ret; | |
1da177e4 LT |
1831 | } |
1832 | ||
7de3ee57 | 1833 | static int crypt_map(struct dm_target *ti, struct bio *bio) |
1da177e4 | 1834 | { |
028867ac | 1835 | struct dm_crypt_io *io; |
49a8a920 | 1836 | struct crypt_config *cc = ti->private; |
647c7db1 | 1837 | |
772ae5f5 MB |
1838 | /* |
1839 | * If bio is REQ_FLUSH or REQ_DISCARD, just bypass crypt queues. | |
1840 | * - for REQ_FLUSH device-mapper core ensures that no IO is in-flight | |
1841 | * - for REQ_DISCARD caller must use flush if IO ordering matters | |
1842 | */ | |
1843 | if (unlikely(bio->bi_rw & (REQ_FLUSH | REQ_DISCARD))) { | |
647c7db1 | 1844 | bio->bi_bdev = cc->dev->bdev; |
772ae5f5 | 1845 | if (bio_sectors(bio)) |
4f024f37 KO |
1846 | bio->bi_iter.bi_sector = cc->start + |
1847 | dm_target_offset(ti, bio->bi_iter.bi_sector); | |
647c7db1 MP |
1848 | return DM_MAPIO_REMAPPED; |
1849 | } | |
1da177e4 | 1850 | |
298a9fa0 MP |
1851 | io = dm_per_bio_data(bio, cc->per_bio_data_size); |
1852 | crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector)); | |
1853 | io->ctx.req = (struct ablkcipher_request *)(io + 1); | |
cabf08e4 | 1854 | |
20c82538 MB |
1855 | if (bio_data_dir(io->base_bio) == READ) { |
1856 | if (kcryptd_io_read(io, GFP_NOWAIT)) | |
1857 | kcryptd_queue_io(io); | |
1858 | } else | |
cabf08e4 | 1859 | kcryptd_queue_crypt(io); |
1da177e4 | 1860 | |
d2a7ad29 | 1861 | return DM_MAPIO_SUBMITTED; |
1da177e4 LT |
1862 | } |
1863 | ||
fd7c092e MP |
1864 | static void crypt_status(struct dm_target *ti, status_type_t type, |
1865 | unsigned status_flags, char *result, unsigned maxlen) | |
1da177e4 | 1866 | { |
5ebaee6d | 1867 | struct crypt_config *cc = ti->private; |
fd7c092e | 1868 | unsigned i, sz = 0; |
1da177e4 LT |
1869 | |
1870 | switch (type) { | |
1871 | case STATUSTYPE_INFO: | |
1872 | result[0] = '\0'; | |
1873 | break; | |
1874 | ||
1875 | case STATUSTYPE_TABLE: | |
7dbcd137 | 1876 | DMEMIT("%s ", cc->cipher_string); |
1da177e4 | 1877 | |
fd7c092e MP |
1878 | if (cc->key_size > 0) |
1879 | for (i = 0; i < cc->key_size; i++) | |
1880 | DMEMIT("%02x", cc->key[i]); | |
1881 | else | |
1882 | DMEMIT("-"); | |
1da177e4 | 1883 | |
4ee218cd AM |
1884 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
1885 | cc->dev->name, (unsigned long long)cc->start); | |
772ae5f5 | 1886 | |
55a62eef | 1887 | if (ti->num_discard_bios) |
772ae5f5 MB |
1888 | DMEMIT(" 1 allow_discards"); |
1889 | ||
1da177e4 LT |
1890 | break; |
1891 | } | |
1da177e4 LT |
1892 | } |
1893 | ||
e48d4bbf MB |
1894 | static void crypt_postsuspend(struct dm_target *ti) |
1895 | { | |
1896 | struct crypt_config *cc = ti->private; | |
1897 | ||
1898 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1899 | } | |
1900 | ||
1901 | static int crypt_preresume(struct dm_target *ti) | |
1902 | { | |
1903 | struct crypt_config *cc = ti->private; | |
1904 | ||
1905 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { | |
1906 | DMERR("aborting resume - crypt key is not set."); | |
1907 | return -EAGAIN; | |
1908 | } | |
1909 | ||
1910 | return 0; | |
1911 | } | |
1912 | ||
1913 | static void crypt_resume(struct dm_target *ti) | |
1914 | { | |
1915 | struct crypt_config *cc = ti->private; | |
1916 | ||
1917 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1918 | } | |
1919 | ||
1920 | /* Message interface | |
1921 | * key set <key> | |
1922 | * key wipe | |
1923 | */ | |
1924 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) | |
1925 | { | |
1926 | struct crypt_config *cc = ti->private; | |
542da317 | 1927 | int ret = -EINVAL; |
e48d4bbf MB |
1928 | |
1929 | if (argc < 2) | |
1930 | goto error; | |
1931 | ||
498f0103 | 1932 | if (!strcasecmp(argv[0], "key")) { |
e48d4bbf MB |
1933 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { |
1934 | DMWARN("not suspended during key manipulation."); | |
1935 | return -EINVAL; | |
1936 | } | |
498f0103 | 1937 | if (argc == 3 && !strcasecmp(argv[1], "set")) { |
542da317 MB |
1938 | ret = crypt_set_key(cc, argv[2]); |
1939 | if (ret) | |
1940 | return ret; | |
1941 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) | |
1942 | ret = cc->iv_gen_ops->init(cc); | |
1943 | return ret; | |
1944 | } | |
498f0103 | 1945 | if (argc == 2 && !strcasecmp(argv[1], "wipe")) { |
542da317 MB |
1946 | if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { |
1947 | ret = cc->iv_gen_ops->wipe(cc); | |
1948 | if (ret) | |
1949 | return ret; | |
1950 | } | |
e48d4bbf | 1951 | return crypt_wipe_key(cc); |
542da317 | 1952 | } |
e48d4bbf MB |
1953 | } |
1954 | ||
1955 | error: | |
1956 | DMWARN("unrecognised message received."); | |
1957 | return -EINVAL; | |
1958 | } | |
1959 | ||
d41e26b9 MB |
1960 | static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm, |
1961 | struct bio_vec *biovec, int max_size) | |
1962 | { | |
1963 | struct crypt_config *cc = ti->private; | |
1964 | struct request_queue *q = bdev_get_queue(cc->dev->bdev); | |
1965 | ||
1966 | if (!q->merge_bvec_fn) | |
1967 | return max_size; | |
1968 | ||
1969 | bvm->bi_bdev = cc->dev->bdev; | |
b441a262 | 1970 | bvm->bi_sector = cc->start + dm_target_offset(ti, bvm->bi_sector); |
d41e26b9 MB |
1971 | |
1972 | return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); | |
1973 | } | |
1974 | ||
af4874e0 MS |
1975 | static int crypt_iterate_devices(struct dm_target *ti, |
1976 | iterate_devices_callout_fn fn, void *data) | |
1977 | { | |
1978 | struct crypt_config *cc = ti->private; | |
1979 | ||
5dea271b | 1980 | return fn(ti, cc->dev, cc->start, ti->len, data); |
af4874e0 MS |
1981 | } |
1982 | ||
1da177e4 LT |
1983 | static struct target_type crypt_target = { |
1984 | .name = "crypt", | |
ed04d981 | 1985 | .version = {1, 13, 0}, |
1da177e4 LT |
1986 | .module = THIS_MODULE, |
1987 | .ctr = crypt_ctr, | |
1988 | .dtr = crypt_dtr, | |
1989 | .map = crypt_map, | |
1990 | .status = crypt_status, | |
e48d4bbf MB |
1991 | .postsuspend = crypt_postsuspend, |
1992 | .preresume = crypt_preresume, | |
1993 | .resume = crypt_resume, | |
1994 | .message = crypt_message, | |
d41e26b9 | 1995 | .merge = crypt_merge, |
af4874e0 | 1996 | .iterate_devices = crypt_iterate_devices, |
1da177e4 LT |
1997 | }; |
1998 | ||
1999 | static int __init dm_crypt_init(void) | |
2000 | { | |
2001 | int r; | |
2002 | ||
028867ac | 2003 | _crypt_io_pool = KMEM_CACHE(dm_crypt_io, 0); |
1da177e4 LT |
2004 | if (!_crypt_io_pool) |
2005 | return -ENOMEM; | |
2006 | ||
1da177e4 LT |
2007 | r = dm_register_target(&crypt_target); |
2008 | if (r < 0) { | |
72d94861 | 2009 | DMERR("register failed %d", r); |
9934a8be | 2010 | kmem_cache_destroy(_crypt_io_pool); |
1da177e4 LT |
2011 | } |
2012 | ||
1da177e4 LT |
2013 | return r; |
2014 | } | |
2015 | ||
2016 | static void __exit dm_crypt_exit(void) | |
2017 | { | |
10d3bd09 | 2018 | dm_unregister_target(&crypt_target); |
1da177e4 LT |
2019 | kmem_cache_destroy(_crypt_io_pool); |
2020 | } | |
2021 | ||
2022 | module_init(dm_crypt_init); | |
2023 | module_exit(dm_crypt_exit); | |
2024 | ||
bf14299f | 2025 | MODULE_AUTHOR("Jana Saout <jana@saout.de>"); |
1da177e4 LT |
2026 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); |
2027 | MODULE_LICENSE("GPL"); |