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Commit | Line | Data |
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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. |
1da177e4 LT |
5 | * |
6 | * This file is released under the GPL. | |
7 | */ | |
8 | ||
43d69034 | 9 | #include <linux/completion.h> |
d1806f6a | 10 | #include <linux/err.h> |
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/init.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/bio.h> | |
15 | #include <linux/blkdev.h> | |
16 | #include <linux/mempool.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/crypto.h> | |
19 | #include <linux/workqueue.h> | |
3fcfab16 | 20 | #include <linux/backing-dev.h> |
c0297721 | 21 | #include <linux/percpu.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; | |
41 | unsigned int offset_in; | |
42 | unsigned int offset_out; | |
43 | unsigned int idx_in; | |
44 | unsigned int idx_out; | |
c66029f4 | 45 | sector_t cc_sector; |
40b6229b | 46 | atomic_t cc_pending; |
1da177e4 LT |
47 | }; |
48 | ||
53017030 MB |
49 | /* |
50 | * per bio private data | |
51 | */ | |
52 | struct dm_crypt_io { | |
49a8a920 | 53 | struct crypt_config *cc; |
53017030 MB |
54 | struct bio *base_bio; |
55 | struct work_struct work; | |
56 | ||
57 | struct convert_context ctx; | |
58 | ||
40b6229b | 59 | atomic_t io_pending; |
53017030 | 60 | int error; |
0c395b0f | 61 | sector_t sector; |
393b47ef | 62 | struct dm_crypt_io *base_io; |
53017030 MB |
63 | }; |
64 | ||
01482b76 | 65 | struct dm_crypt_request { |
b2174eeb | 66 | struct convert_context *ctx; |
01482b76 MB |
67 | struct scatterlist sg_in; |
68 | struct scatterlist sg_out; | |
2dc5327d | 69 | sector_t iv_sector; |
01482b76 MB |
70 | }; |
71 | ||
1da177e4 LT |
72 | struct crypt_config; |
73 | ||
74 | struct crypt_iv_operations { | |
75 | int (*ctr)(struct crypt_config *cc, struct dm_target *ti, | |
d469f841 | 76 | const char *opts); |
1da177e4 | 77 | void (*dtr)(struct crypt_config *cc); |
b95bf2d3 | 78 | int (*init)(struct crypt_config *cc); |
542da317 | 79 | int (*wipe)(struct crypt_config *cc); |
2dc5327d MB |
80 | int (*generator)(struct crypt_config *cc, u8 *iv, |
81 | struct dm_crypt_request *dmreq); | |
82 | int (*post)(struct crypt_config *cc, u8 *iv, | |
83 | struct dm_crypt_request *dmreq); | |
1da177e4 LT |
84 | }; |
85 | ||
60473592 | 86 | struct iv_essiv_private { |
b95bf2d3 MB |
87 | struct crypto_hash *hash_tfm; |
88 | u8 *salt; | |
60473592 MB |
89 | }; |
90 | ||
91 | struct iv_benbi_private { | |
92 | int shift; | |
93 | }; | |
94 | ||
34745785 MB |
95 | #define LMK_SEED_SIZE 64 /* hash + 0 */ |
96 | struct iv_lmk_private { | |
97 | struct crypto_shash *hash_tfm; | |
98 | u8 *seed; | |
99 | }; | |
100 | ||
1da177e4 LT |
101 | /* |
102 | * Crypt: maps a linear range of a block device | |
103 | * and encrypts / decrypts at the same time. | |
104 | */ | |
e48d4bbf | 105 | enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID }; |
c0297721 AK |
106 | |
107 | /* | |
108 | * Duplicated per-CPU state for cipher. | |
109 | */ | |
110 | struct crypt_cpu { | |
111 | struct ablkcipher_request *req; | |
c0297721 AK |
112 | }; |
113 | ||
114 | /* | |
115 | * The fields in here must be read only after initialization, | |
116 | * changing state should be in crypt_cpu. | |
117 | */ | |
1da177e4 LT |
118 | struct crypt_config { |
119 | struct dm_dev *dev; | |
120 | sector_t start; | |
121 | ||
122 | /* | |
ddd42edf MB |
123 | * pool for per bio private data, crypto requests and |
124 | * encryption requeusts/buffer pages | |
1da177e4 LT |
125 | */ |
126 | mempool_t *io_pool; | |
ddd42edf | 127 | mempool_t *req_pool; |
1da177e4 | 128 | mempool_t *page_pool; |
6a24c718 | 129 | struct bio_set *bs; |
1da177e4 | 130 | |
cabf08e4 MB |
131 | struct workqueue_struct *io_queue; |
132 | struct workqueue_struct *crypt_queue; | |
3f1e9070 | 133 | |
5ebaee6d | 134 | char *cipher; |
7dbcd137 | 135 | char *cipher_string; |
5ebaee6d | 136 | |
1da177e4 | 137 | struct crypt_iv_operations *iv_gen_ops; |
79066ad3 | 138 | union { |
60473592 MB |
139 | struct iv_essiv_private essiv; |
140 | struct iv_benbi_private benbi; | |
34745785 | 141 | struct iv_lmk_private lmk; |
79066ad3 | 142 | } iv_gen_private; |
1da177e4 LT |
143 | sector_t iv_offset; |
144 | unsigned int iv_size; | |
145 | ||
c0297721 AK |
146 | /* |
147 | * Duplicated per cpu state. Access through | |
148 | * per_cpu_ptr() only. | |
149 | */ | |
150 | struct crypt_cpu __percpu *cpu; | |
fd2d231f MP |
151 | |
152 | /* ESSIV: struct crypto_cipher *essiv_tfm */ | |
153 | void *iv_private; | |
154 | struct crypto_ablkcipher **tfms; | |
d1f96423 | 155 | unsigned tfms_count; |
c0297721 | 156 | |
ddd42edf MB |
157 | /* |
158 | * Layout of each crypto request: | |
159 | * | |
160 | * struct ablkcipher_request | |
161 | * context | |
162 | * padding | |
163 | * struct dm_crypt_request | |
164 | * padding | |
165 | * IV | |
166 | * | |
167 | * The padding is added so that dm_crypt_request and the IV are | |
168 | * correctly aligned. | |
169 | */ | |
170 | unsigned int dmreq_start; | |
ddd42edf | 171 | |
e48d4bbf | 172 | unsigned long flags; |
1da177e4 | 173 | unsigned int key_size; |
d1f96423 | 174 | unsigned int key_parts; |
1da177e4 LT |
175 | u8 key[0]; |
176 | }; | |
177 | ||
6a24c718 | 178 | #define MIN_IOS 16 |
1da177e4 | 179 | #define MIN_POOL_PAGES 32 |
1da177e4 | 180 | |
e18b890b | 181 | static struct kmem_cache *_crypt_io_pool; |
1da177e4 | 182 | |
028867ac | 183 | static void clone_init(struct dm_crypt_io *, struct bio *); |
395b167c | 184 | static void kcryptd_queue_crypt(struct dm_crypt_io *io); |
2dc5327d | 185 | static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq); |
027581f3 | 186 | |
c0297721 AK |
187 | static struct crypt_cpu *this_crypt_config(struct crypt_config *cc) |
188 | { | |
189 | return this_cpu_ptr(cc->cpu); | |
190 | } | |
191 | ||
192 | /* | |
193 | * Use this to access cipher attributes that are the same for each CPU. | |
194 | */ | |
195 | static struct crypto_ablkcipher *any_tfm(struct crypt_config *cc) | |
196 | { | |
fd2d231f | 197 | return cc->tfms[0]; |
c0297721 AK |
198 | } |
199 | ||
1da177e4 LT |
200 | /* |
201 | * Different IV generation algorithms: | |
202 | * | |
3c164bd8 | 203 | * plain: the initial vector is the 32-bit little-endian version of the sector |
3a4fa0a2 | 204 | * number, padded with zeros if necessary. |
1da177e4 | 205 | * |
61afef61 MB |
206 | * plain64: the initial vector is the 64-bit little-endian version of the sector |
207 | * number, padded with zeros if necessary. | |
208 | * | |
3c164bd8 RS |
209 | * essiv: "encrypted sector|salt initial vector", the sector number is |
210 | * encrypted with the bulk cipher using a salt as key. The salt | |
211 | * should be derived from the bulk cipher's key via hashing. | |
1da177e4 | 212 | * |
48527fa7 RS |
213 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
214 | * (needed for LRW-32-AES and possible other narrow block modes) | |
215 | * | |
46b47730 LN |
216 | * null: the initial vector is always zero. Provides compatibility with |
217 | * obsolete loop_fish2 devices. Do not use for new devices. | |
218 | * | |
34745785 MB |
219 | * lmk: Compatible implementation of the block chaining mode used |
220 | * by the Loop-AES block device encryption system | |
221 | * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ | |
222 | * It operates on full 512 byte sectors and uses CBC | |
223 | * with an IV derived from the sector number, the data and | |
224 | * optionally extra IV seed. | |
225 | * This means that after decryption the first block | |
226 | * of sector must be tweaked according to decrypted data. | |
227 | * Loop-AES can use three encryption schemes: | |
228 | * version 1: is plain aes-cbc mode | |
229 | * version 2: uses 64 multikey scheme with lmk IV generator | |
230 | * version 3: the same as version 2 with additional IV seed | |
231 | * (it uses 65 keys, last key is used as IV seed) | |
232 | * | |
1da177e4 LT |
233 | * plumb: unimplemented, see: |
234 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 | |
235 | */ | |
236 | ||
2dc5327d MB |
237 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, |
238 | struct dm_crypt_request *dmreq) | |
1da177e4 LT |
239 | { |
240 | memset(iv, 0, cc->iv_size); | |
283a8328 | 241 | *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); |
1da177e4 LT |
242 | |
243 | return 0; | |
244 | } | |
245 | ||
61afef61 | 246 | static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, |
2dc5327d | 247 | struct dm_crypt_request *dmreq) |
61afef61 MB |
248 | { |
249 | memset(iv, 0, cc->iv_size); | |
283a8328 | 250 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
61afef61 MB |
251 | |
252 | return 0; | |
253 | } | |
254 | ||
b95bf2d3 MB |
255 | /* Initialise ESSIV - compute salt but no local memory allocations */ |
256 | static int crypt_iv_essiv_init(struct crypt_config *cc) | |
257 | { | |
258 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
259 | struct hash_desc desc; | |
260 | struct scatterlist sg; | |
c0297721 | 261 | struct crypto_cipher *essiv_tfm; |
fd2d231f | 262 | int err; |
b95bf2d3 MB |
263 | |
264 | sg_init_one(&sg, cc->key, cc->key_size); | |
265 | desc.tfm = essiv->hash_tfm; | |
266 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
267 | ||
268 | err = crypto_hash_digest(&desc, &sg, cc->key_size, essiv->salt); | |
269 | if (err) | |
270 | return err; | |
271 | ||
fd2d231f | 272 | essiv_tfm = cc->iv_private; |
c0297721 | 273 | |
fd2d231f MP |
274 | err = crypto_cipher_setkey(essiv_tfm, essiv->salt, |
275 | crypto_hash_digestsize(essiv->hash_tfm)); | |
276 | if (err) | |
277 | return err; | |
c0297721 AK |
278 | |
279 | return 0; | |
b95bf2d3 MB |
280 | } |
281 | ||
542da317 MB |
282 | /* Wipe salt and reset key derived from volume key */ |
283 | static int crypt_iv_essiv_wipe(struct crypt_config *cc) | |
284 | { | |
285 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
286 | unsigned salt_size = crypto_hash_digestsize(essiv->hash_tfm); | |
c0297721 | 287 | struct crypto_cipher *essiv_tfm; |
fd2d231f | 288 | int r, err = 0; |
542da317 MB |
289 | |
290 | memset(essiv->salt, 0, salt_size); | |
291 | ||
fd2d231f MP |
292 | essiv_tfm = cc->iv_private; |
293 | r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size); | |
294 | if (r) | |
295 | err = r; | |
c0297721 AK |
296 | |
297 | return err; | |
298 | } | |
299 | ||
300 | /* Set up per cpu cipher state */ | |
301 | static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc, | |
302 | struct dm_target *ti, | |
303 | u8 *salt, unsigned saltsize) | |
304 | { | |
305 | struct crypto_cipher *essiv_tfm; | |
306 | int err; | |
307 | ||
308 | /* Setup the essiv_tfm with the given salt */ | |
309 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); | |
310 | if (IS_ERR(essiv_tfm)) { | |
311 | ti->error = "Error allocating crypto tfm for ESSIV"; | |
312 | return essiv_tfm; | |
313 | } | |
314 | ||
315 | if (crypto_cipher_blocksize(essiv_tfm) != | |
316 | crypto_ablkcipher_ivsize(any_tfm(cc))) { | |
317 | ti->error = "Block size of ESSIV cipher does " | |
318 | "not match IV size of block cipher"; | |
319 | crypto_free_cipher(essiv_tfm); | |
320 | return ERR_PTR(-EINVAL); | |
321 | } | |
322 | ||
323 | err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); | |
324 | if (err) { | |
325 | ti->error = "Failed to set key for ESSIV cipher"; | |
326 | crypto_free_cipher(essiv_tfm); | |
327 | return ERR_PTR(err); | |
328 | } | |
329 | ||
330 | return essiv_tfm; | |
542da317 MB |
331 | } |
332 | ||
60473592 MB |
333 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) |
334 | { | |
c0297721 | 335 | struct crypto_cipher *essiv_tfm; |
60473592 MB |
336 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; |
337 | ||
b95bf2d3 MB |
338 | crypto_free_hash(essiv->hash_tfm); |
339 | essiv->hash_tfm = NULL; | |
340 | ||
341 | kzfree(essiv->salt); | |
342 | essiv->salt = NULL; | |
c0297721 | 343 | |
fd2d231f | 344 | essiv_tfm = cc->iv_private; |
c0297721 | 345 | |
fd2d231f MP |
346 | if (essiv_tfm) |
347 | crypto_free_cipher(essiv_tfm); | |
c0297721 | 348 | |
fd2d231f | 349 | cc->iv_private = NULL; |
60473592 MB |
350 | } |
351 | ||
1da177e4 | 352 | static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, |
d469f841 | 353 | const char *opts) |
1da177e4 | 354 | { |
5861f1be MB |
355 | struct crypto_cipher *essiv_tfm = NULL; |
356 | struct crypto_hash *hash_tfm = NULL; | |
5861f1be | 357 | u8 *salt = NULL; |
fd2d231f | 358 | int err; |
1da177e4 | 359 | |
5861f1be | 360 | if (!opts) { |
72d94861 | 361 | ti->error = "Digest algorithm missing for ESSIV mode"; |
1da177e4 LT |
362 | return -EINVAL; |
363 | } | |
364 | ||
b95bf2d3 | 365 | /* Allocate hash algorithm */ |
35058687 HX |
366 | hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC); |
367 | if (IS_ERR(hash_tfm)) { | |
72d94861 | 368 | ti->error = "Error initializing ESSIV hash"; |
5861f1be MB |
369 | err = PTR_ERR(hash_tfm); |
370 | goto bad; | |
1da177e4 LT |
371 | } |
372 | ||
b95bf2d3 | 373 | salt = kzalloc(crypto_hash_digestsize(hash_tfm), GFP_KERNEL); |
5861f1be | 374 | if (!salt) { |
72d94861 | 375 | ti->error = "Error kmallocing salt storage in ESSIV"; |
5861f1be MB |
376 | err = -ENOMEM; |
377 | goto bad; | |
1da177e4 LT |
378 | } |
379 | ||
b95bf2d3 | 380 | cc->iv_gen_private.essiv.salt = salt; |
b95bf2d3 MB |
381 | cc->iv_gen_private.essiv.hash_tfm = hash_tfm; |
382 | ||
fd2d231f MP |
383 | essiv_tfm = setup_essiv_cpu(cc, ti, salt, |
384 | crypto_hash_digestsize(hash_tfm)); | |
385 | if (IS_ERR(essiv_tfm)) { | |
386 | crypt_iv_essiv_dtr(cc); | |
387 | return PTR_ERR(essiv_tfm); | |
c0297721 | 388 | } |
fd2d231f | 389 | cc->iv_private = essiv_tfm; |
c0297721 | 390 | |
1da177e4 | 391 | return 0; |
5861f1be MB |
392 | |
393 | bad: | |
5861f1be MB |
394 | if (hash_tfm && !IS_ERR(hash_tfm)) |
395 | crypto_free_hash(hash_tfm); | |
b95bf2d3 | 396 | kfree(salt); |
5861f1be | 397 | return err; |
1da177e4 LT |
398 | } |
399 | ||
2dc5327d MB |
400 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, |
401 | struct dm_crypt_request *dmreq) | |
1da177e4 | 402 | { |
fd2d231f | 403 | struct crypto_cipher *essiv_tfm = cc->iv_private; |
c0297721 | 404 | |
1da177e4 | 405 | memset(iv, 0, cc->iv_size); |
283a8328 | 406 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
c0297721 AK |
407 | crypto_cipher_encrypt_one(essiv_tfm, iv, iv); |
408 | ||
1da177e4 LT |
409 | return 0; |
410 | } | |
411 | ||
48527fa7 RS |
412 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
413 | const char *opts) | |
414 | { | |
c0297721 | 415 | unsigned bs = crypto_ablkcipher_blocksize(any_tfm(cc)); |
f0d1b0b3 | 416 | int log = ilog2(bs); |
48527fa7 RS |
417 | |
418 | /* we need to calculate how far we must shift the sector count | |
419 | * to get the cipher block count, we use this shift in _gen */ | |
420 | ||
421 | if (1 << log != bs) { | |
422 | ti->error = "cypher blocksize is not a power of 2"; | |
423 | return -EINVAL; | |
424 | } | |
425 | ||
426 | if (log > 9) { | |
427 | ti->error = "cypher blocksize is > 512"; | |
428 | return -EINVAL; | |
429 | } | |
430 | ||
60473592 | 431 | cc->iv_gen_private.benbi.shift = 9 - log; |
48527fa7 RS |
432 | |
433 | return 0; | |
434 | } | |
435 | ||
436 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) | |
437 | { | |
48527fa7 RS |
438 | } |
439 | ||
2dc5327d MB |
440 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, |
441 | struct dm_crypt_request *dmreq) | |
48527fa7 | 442 | { |
79066ad3 HX |
443 | __be64 val; |
444 | ||
48527fa7 | 445 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
79066ad3 | 446 | |
2dc5327d | 447 | val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); |
79066ad3 | 448 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); |
48527fa7 | 449 | |
1da177e4 LT |
450 | return 0; |
451 | } | |
452 | ||
2dc5327d MB |
453 | static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, |
454 | struct dm_crypt_request *dmreq) | |
46b47730 LN |
455 | { |
456 | memset(iv, 0, cc->iv_size); | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
34745785 MB |
461 | static void crypt_iv_lmk_dtr(struct crypt_config *cc) |
462 | { | |
463 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
464 | ||
465 | if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) | |
466 | crypto_free_shash(lmk->hash_tfm); | |
467 | lmk->hash_tfm = NULL; | |
468 | ||
469 | kzfree(lmk->seed); | |
470 | lmk->seed = NULL; | |
471 | } | |
472 | ||
473 | static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, | |
474 | const char *opts) | |
475 | { | |
476 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
477 | ||
478 | lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0); | |
479 | if (IS_ERR(lmk->hash_tfm)) { | |
480 | ti->error = "Error initializing LMK hash"; | |
481 | return PTR_ERR(lmk->hash_tfm); | |
482 | } | |
483 | ||
484 | /* No seed in LMK version 2 */ | |
485 | if (cc->key_parts == cc->tfms_count) { | |
486 | lmk->seed = NULL; | |
487 | return 0; | |
488 | } | |
489 | ||
490 | lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); | |
491 | if (!lmk->seed) { | |
492 | crypt_iv_lmk_dtr(cc); | |
493 | ti->error = "Error kmallocing seed storage in LMK"; | |
494 | return -ENOMEM; | |
495 | } | |
496 | ||
497 | return 0; | |
498 | } | |
499 | ||
500 | static int crypt_iv_lmk_init(struct crypt_config *cc) | |
501 | { | |
502 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
503 | int subkey_size = cc->key_size / cc->key_parts; | |
504 | ||
505 | /* LMK seed is on the position of LMK_KEYS + 1 key */ | |
506 | if (lmk->seed) | |
507 | memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), | |
508 | crypto_shash_digestsize(lmk->hash_tfm)); | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
513 | static int crypt_iv_lmk_wipe(struct crypt_config *cc) | |
514 | { | |
515 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
516 | ||
517 | if (lmk->seed) | |
518 | memset(lmk->seed, 0, LMK_SEED_SIZE); | |
519 | ||
520 | return 0; | |
521 | } | |
522 | ||
523 | static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, | |
524 | struct dm_crypt_request *dmreq, | |
525 | u8 *data) | |
526 | { | |
527 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
528 | struct { | |
529 | struct shash_desc desc; | |
530 | char ctx[crypto_shash_descsize(lmk->hash_tfm)]; | |
531 | } sdesc; | |
532 | struct md5_state md5state; | |
533 | u32 buf[4]; | |
534 | int i, r; | |
535 | ||
536 | sdesc.desc.tfm = lmk->hash_tfm; | |
537 | sdesc.desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
538 | ||
539 | r = crypto_shash_init(&sdesc.desc); | |
540 | if (r) | |
541 | return r; | |
542 | ||
543 | if (lmk->seed) { | |
544 | r = crypto_shash_update(&sdesc.desc, lmk->seed, LMK_SEED_SIZE); | |
545 | if (r) | |
546 | return r; | |
547 | } | |
548 | ||
549 | /* Sector is always 512B, block size 16, add data of blocks 1-31 */ | |
550 | r = crypto_shash_update(&sdesc.desc, data + 16, 16 * 31); | |
551 | if (r) | |
552 | return r; | |
553 | ||
554 | /* Sector is cropped to 56 bits here */ | |
555 | buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); | |
556 | buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); | |
557 | buf[2] = cpu_to_le32(4024); | |
558 | buf[3] = 0; | |
559 | r = crypto_shash_update(&sdesc.desc, (u8 *)buf, sizeof(buf)); | |
560 | if (r) | |
561 | return r; | |
562 | ||
563 | /* No MD5 padding here */ | |
564 | r = crypto_shash_export(&sdesc.desc, &md5state); | |
565 | if (r) | |
566 | return r; | |
567 | ||
568 | for (i = 0; i < MD5_HASH_WORDS; i++) | |
569 | __cpu_to_le32s(&md5state.hash[i]); | |
570 | memcpy(iv, &md5state.hash, cc->iv_size); | |
571 | ||
572 | return 0; | |
573 | } | |
574 | ||
575 | static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, | |
576 | struct dm_crypt_request *dmreq) | |
577 | { | |
578 | u8 *src; | |
579 | int r = 0; | |
580 | ||
581 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { | |
c2e022cb | 582 | src = kmap_atomic(sg_page(&dmreq->sg_in)); |
34745785 | 583 | r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset); |
c2e022cb | 584 | kunmap_atomic(src); |
34745785 MB |
585 | } else |
586 | memset(iv, 0, cc->iv_size); | |
587 | ||
588 | return r; | |
589 | } | |
590 | ||
591 | static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, | |
592 | struct dm_crypt_request *dmreq) | |
593 | { | |
594 | u8 *dst; | |
595 | int r; | |
596 | ||
597 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) | |
598 | return 0; | |
599 | ||
c2e022cb | 600 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); |
34745785 MB |
601 | r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset); |
602 | ||
603 | /* Tweak the first block of plaintext sector */ | |
604 | if (!r) | |
605 | crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size); | |
606 | ||
c2e022cb | 607 | kunmap_atomic(dst); |
34745785 MB |
608 | return r; |
609 | } | |
610 | ||
1da177e4 LT |
611 | static struct crypt_iv_operations crypt_iv_plain_ops = { |
612 | .generator = crypt_iv_plain_gen | |
613 | }; | |
614 | ||
61afef61 MB |
615 | static struct crypt_iv_operations crypt_iv_plain64_ops = { |
616 | .generator = crypt_iv_plain64_gen | |
617 | }; | |
618 | ||
1da177e4 LT |
619 | static struct crypt_iv_operations crypt_iv_essiv_ops = { |
620 | .ctr = crypt_iv_essiv_ctr, | |
621 | .dtr = crypt_iv_essiv_dtr, | |
b95bf2d3 | 622 | .init = crypt_iv_essiv_init, |
542da317 | 623 | .wipe = crypt_iv_essiv_wipe, |
1da177e4 LT |
624 | .generator = crypt_iv_essiv_gen |
625 | }; | |
626 | ||
48527fa7 RS |
627 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
628 | .ctr = crypt_iv_benbi_ctr, | |
629 | .dtr = crypt_iv_benbi_dtr, | |
630 | .generator = crypt_iv_benbi_gen | |
631 | }; | |
1da177e4 | 632 | |
46b47730 LN |
633 | static struct crypt_iv_operations crypt_iv_null_ops = { |
634 | .generator = crypt_iv_null_gen | |
635 | }; | |
636 | ||
34745785 MB |
637 | static struct crypt_iv_operations crypt_iv_lmk_ops = { |
638 | .ctr = crypt_iv_lmk_ctr, | |
639 | .dtr = crypt_iv_lmk_dtr, | |
640 | .init = crypt_iv_lmk_init, | |
641 | .wipe = crypt_iv_lmk_wipe, | |
642 | .generator = crypt_iv_lmk_gen, | |
643 | .post = crypt_iv_lmk_post | |
644 | }; | |
645 | ||
d469f841 MB |
646 | static void crypt_convert_init(struct crypt_config *cc, |
647 | struct convert_context *ctx, | |
648 | struct bio *bio_out, struct bio *bio_in, | |
fcd369da | 649 | sector_t sector) |
1da177e4 LT |
650 | { |
651 | ctx->bio_in = bio_in; | |
652 | ctx->bio_out = bio_out; | |
653 | ctx->offset_in = 0; | |
654 | ctx->offset_out = 0; | |
655 | ctx->idx_in = bio_in ? bio_in->bi_idx : 0; | |
656 | ctx->idx_out = bio_out ? bio_out->bi_idx : 0; | |
c66029f4 | 657 | ctx->cc_sector = sector + cc->iv_offset; |
43d69034 | 658 | init_completion(&ctx->restart); |
1da177e4 LT |
659 | } |
660 | ||
b2174eeb HY |
661 | static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, |
662 | struct ablkcipher_request *req) | |
663 | { | |
664 | return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); | |
665 | } | |
666 | ||
667 | static struct ablkcipher_request *req_of_dmreq(struct crypt_config *cc, | |
668 | struct dm_crypt_request *dmreq) | |
669 | { | |
670 | return (struct ablkcipher_request *)((char *)dmreq - cc->dmreq_start); | |
671 | } | |
672 | ||
2dc5327d MB |
673 | static u8 *iv_of_dmreq(struct crypt_config *cc, |
674 | struct dm_crypt_request *dmreq) | |
675 | { | |
676 | return (u8 *)ALIGN((unsigned long)(dmreq + 1), | |
677 | crypto_ablkcipher_alignmask(any_tfm(cc)) + 1); | |
678 | } | |
679 | ||
01482b76 | 680 | static int crypt_convert_block(struct crypt_config *cc, |
3a7f6c99 MB |
681 | struct convert_context *ctx, |
682 | struct ablkcipher_request *req) | |
01482b76 MB |
683 | { |
684 | struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in); | |
685 | struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out); | |
3a7f6c99 MB |
686 | struct dm_crypt_request *dmreq; |
687 | u8 *iv; | |
40b6229b | 688 | int r; |
3a7f6c99 | 689 | |
b2174eeb | 690 | dmreq = dmreq_of_req(cc, req); |
2dc5327d | 691 | iv = iv_of_dmreq(cc, dmreq); |
01482b76 | 692 | |
c66029f4 | 693 | dmreq->iv_sector = ctx->cc_sector; |
b2174eeb | 694 | dmreq->ctx = ctx; |
3a7f6c99 MB |
695 | sg_init_table(&dmreq->sg_in, 1); |
696 | sg_set_page(&dmreq->sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT, | |
01482b76 MB |
697 | bv_in->bv_offset + ctx->offset_in); |
698 | ||
3a7f6c99 MB |
699 | sg_init_table(&dmreq->sg_out, 1); |
700 | sg_set_page(&dmreq->sg_out, bv_out->bv_page, 1 << SECTOR_SHIFT, | |
01482b76 MB |
701 | bv_out->bv_offset + ctx->offset_out); |
702 | ||
703 | ctx->offset_in += 1 << SECTOR_SHIFT; | |
704 | if (ctx->offset_in >= bv_in->bv_len) { | |
705 | ctx->offset_in = 0; | |
706 | ctx->idx_in++; | |
707 | } | |
708 | ||
709 | ctx->offset_out += 1 << SECTOR_SHIFT; | |
710 | if (ctx->offset_out >= bv_out->bv_len) { | |
711 | ctx->offset_out = 0; | |
712 | ctx->idx_out++; | |
713 | } | |
714 | ||
3a7f6c99 | 715 | if (cc->iv_gen_ops) { |
2dc5327d | 716 | r = cc->iv_gen_ops->generator(cc, iv, dmreq); |
3a7f6c99 MB |
717 | if (r < 0) |
718 | return r; | |
719 | } | |
720 | ||
721 | ablkcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out, | |
722 | 1 << SECTOR_SHIFT, iv); | |
723 | ||
724 | if (bio_data_dir(ctx->bio_in) == WRITE) | |
725 | r = crypto_ablkcipher_encrypt(req); | |
726 | else | |
727 | r = crypto_ablkcipher_decrypt(req); | |
728 | ||
2dc5327d MB |
729 | if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) |
730 | r = cc->iv_gen_ops->post(cc, iv, dmreq); | |
731 | ||
3a7f6c99 | 732 | return r; |
01482b76 MB |
733 | } |
734 | ||
95497a96 MB |
735 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
736 | int error); | |
c0297721 | 737 | |
ddd42edf MB |
738 | static void crypt_alloc_req(struct crypt_config *cc, |
739 | struct convert_context *ctx) | |
740 | { | |
c0297721 | 741 | struct crypt_cpu *this_cc = this_crypt_config(cc); |
c66029f4 | 742 | unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1); |
c0297721 AK |
743 | |
744 | if (!this_cc->req) | |
745 | this_cc->req = mempool_alloc(cc->req_pool, GFP_NOIO); | |
746 | ||
fd2d231f | 747 | ablkcipher_request_set_tfm(this_cc->req, cc->tfms[key_index]); |
c0297721 AK |
748 | ablkcipher_request_set_callback(this_cc->req, |
749 | CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, | |
750 | kcryptd_async_done, dmreq_of_req(cc, this_cc->req)); | |
ddd42edf MB |
751 | } |
752 | ||
1da177e4 LT |
753 | /* |
754 | * Encrypt / decrypt data from one bio to another one (can be the same one) | |
755 | */ | |
756 | static int crypt_convert(struct crypt_config *cc, | |
d469f841 | 757 | struct convert_context *ctx) |
1da177e4 | 758 | { |
c0297721 | 759 | struct crypt_cpu *this_cc = this_crypt_config(cc); |
3f1e9070 | 760 | int r; |
1da177e4 | 761 | |
40b6229b | 762 | atomic_set(&ctx->cc_pending, 1); |
c8081618 | 763 | |
1da177e4 LT |
764 | while(ctx->idx_in < ctx->bio_in->bi_vcnt && |
765 | ctx->idx_out < ctx->bio_out->bi_vcnt) { | |
1da177e4 | 766 | |
3a7f6c99 MB |
767 | crypt_alloc_req(cc, ctx); |
768 | ||
40b6229b | 769 | atomic_inc(&ctx->cc_pending); |
3f1e9070 | 770 | |
c0297721 | 771 | r = crypt_convert_block(cc, ctx, this_cc->req); |
3a7f6c99 MB |
772 | |
773 | switch (r) { | |
3f1e9070 | 774 | /* async */ |
3a7f6c99 MB |
775 | case -EBUSY: |
776 | wait_for_completion(&ctx->restart); | |
777 | INIT_COMPLETION(ctx->restart); | |
778 | /* fall through*/ | |
779 | case -EINPROGRESS: | |
c0297721 | 780 | this_cc->req = NULL; |
c66029f4 | 781 | ctx->cc_sector++; |
3f1e9070 MB |
782 | continue; |
783 | ||
784 | /* sync */ | |
3a7f6c99 | 785 | case 0: |
40b6229b | 786 | atomic_dec(&ctx->cc_pending); |
c66029f4 | 787 | ctx->cc_sector++; |
c7f1b204 | 788 | cond_resched(); |
3a7f6c99 | 789 | continue; |
3a7f6c99 | 790 | |
3f1e9070 MB |
791 | /* error */ |
792 | default: | |
40b6229b | 793 | atomic_dec(&ctx->cc_pending); |
3f1e9070 MB |
794 | return r; |
795 | } | |
1da177e4 LT |
796 | } |
797 | ||
3f1e9070 | 798 | return 0; |
1da177e4 LT |
799 | } |
800 | ||
d469f841 MB |
801 | static void dm_crypt_bio_destructor(struct bio *bio) |
802 | { | |
028867ac | 803 | struct dm_crypt_io *io = bio->bi_private; |
49a8a920 | 804 | struct crypt_config *cc = io->cc; |
6a24c718 MB |
805 | |
806 | bio_free(bio, cc->bs); | |
d469f841 | 807 | } |
6a24c718 | 808 | |
1da177e4 LT |
809 | /* |
810 | * Generate a new unfragmented bio with the given size | |
811 | * This should never violate the device limitations | |
933f01d4 MB |
812 | * May return a smaller bio when running out of pages, indicated by |
813 | * *out_of_pages set to 1. | |
1da177e4 | 814 | */ |
933f01d4 MB |
815 | static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size, |
816 | unsigned *out_of_pages) | |
1da177e4 | 817 | { |
49a8a920 | 818 | struct crypt_config *cc = io->cc; |
8b004457 | 819 | struct bio *clone; |
1da177e4 | 820 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
b4e3ca1a | 821 | gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM; |
91e10625 MB |
822 | unsigned i, len; |
823 | struct page *page; | |
1da177e4 | 824 | |
2f9941b6 | 825 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
8b004457 | 826 | if (!clone) |
1da177e4 | 827 | return NULL; |
1da177e4 | 828 | |
027581f3 | 829 | clone_init(io, clone); |
933f01d4 | 830 | *out_of_pages = 0; |
6a24c718 | 831 | |
f97380bc | 832 | for (i = 0; i < nr_iovecs; i++) { |
91e10625 | 833 | page = mempool_alloc(cc->page_pool, gfp_mask); |
933f01d4 MB |
834 | if (!page) { |
835 | *out_of_pages = 1; | |
1da177e4 | 836 | break; |
933f01d4 | 837 | } |
1da177e4 LT |
838 | |
839 | /* | |
aeb2deae MP |
840 | * If additional pages cannot be allocated without waiting, |
841 | * return a partially-allocated bio. The caller will then try | |
842 | * to allocate more bios while submitting this partial bio. | |
1da177e4 | 843 | */ |
aeb2deae | 844 | gfp_mask = (gfp_mask | __GFP_NOWARN) & ~__GFP_WAIT; |
1da177e4 | 845 | |
91e10625 MB |
846 | len = (size > PAGE_SIZE) ? PAGE_SIZE : size; |
847 | ||
848 | if (!bio_add_page(clone, page, len, 0)) { | |
849 | mempool_free(page, cc->page_pool); | |
850 | break; | |
851 | } | |
1da177e4 | 852 | |
91e10625 | 853 | size -= len; |
1da177e4 LT |
854 | } |
855 | ||
8b004457 MB |
856 | if (!clone->bi_size) { |
857 | bio_put(clone); | |
1da177e4 LT |
858 | return NULL; |
859 | } | |
860 | ||
8b004457 | 861 | return clone; |
1da177e4 LT |
862 | } |
863 | ||
644bd2f0 | 864 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) |
1da177e4 | 865 | { |
644bd2f0 | 866 | unsigned int i; |
1da177e4 LT |
867 | struct bio_vec *bv; |
868 | ||
644bd2f0 | 869 | for (i = 0; i < clone->bi_vcnt; i++) { |
8b004457 | 870 | bv = bio_iovec_idx(clone, i); |
1da177e4 LT |
871 | BUG_ON(!bv->bv_page); |
872 | mempool_free(bv->bv_page, cc->page_pool); | |
873 | bv->bv_page = NULL; | |
874 | } | |
875 | } | |
876 | ||
49a8a920 | 877 | static struct dm_crypt_io *crypt_io_alloc(struct crypt_config *cc, |
dc440d1e MB |
878 | struct bio *bio, sector_t sector) |
879 | { | |
dc440d1e MB |
880 | struct dm_crypt_io *io; |
881 | ||
882 | io = mempool_alloc(cc->io_pool, GFP_NOIO); | |
49a8a920 | 883 | io->cc = cc; |
dc440d1e MB |
884 | io->base_bio = bio; |
885 | io->sector = sector; | |
886 | io->error = 0; | |
393b47ef | 887 | io->base_io = NULL; |
40b6229b | 888 | atomic_set(&io->io_pending, 0); |
dc440d1e MB |
889 | |
890 | return io; | |
891 | } | |
892 | ||
3e1a8bdd MB |
893 | static void crypt_inc_pending(struct dm_crypt_io *io) |
894 | { | |
40b6229b | 895 | atomic_inc(&io->io_pending); |
3e1a8bdd MB |
896 | } |
897 | ||
1da177e4 LT |
898 | /* |
899 | * One of the bios was finished. Check for completion of | |
900 | * the whole request and correctly clean up the buffer. | |
393b47ef | 901 | * If base_io is set, wait for the last fragment to complete. |
1da177e4 | 902 | */ |
5742fd77 | 903 | static void crypt_dec_pending(struct dm_crypt_io *io) |
1da177e4 | 904 | { |
49a8a920 | 905 | struct crypt_config *cc = io->cc; |
b35f8caa MB |
906 | struct bio *base_bio = io->base_bio; |
907 | struct dm_crypt_io *base_io = io->base_io; | |
908 | int error = io->error; | |
1da177e4 | 909 | |
40b6229b | 910 | if (!atomic_dec_and_test(&io->io_pending)) |
1da177e4 LT |
911 | return; |
912 | ||
b35f8caa MB |
913 | mempool_free(io, cc->io_pool); |
914 | ||
915 | if (likely(!base_io)) | |
916 | bio_endio(base_bio, error); | |
393b47ef | 917 | else { |
b35f8caa MB |
918 | if (error && !base_io->error) |
919 | base_io->error = error; | |
920 | crypt_dec_pending(base_io); | |
393b47ef | 921 | } |
1da177e4 LT |
922 | } |
923 | ||
924 | /* | |
cabf08e4 | 925 | * kcryptd/kcryptd_io: |
1da177e4 LT |
926 | * |
927 | * Needed because it would be very unwise to do decryption in an | |
23541d2d | 928 | * interrupt context. |
cabf08e4 MB |
929 | * |
930 | * kcryptd performs the actual encryption or decryption. | |
931 | * | |
932 | * kcryptd_io performs the IO submission. | |
933 | * | |
934 | * They must be separated as otherwise the final stages could be | |
935 | * starved by new requests which can block in the first stages due | |
936 | * to memory allocation. | |
c0297721 AK |
937 | * |
938 | * The work is done per CPU global for all dm-crypt instances. | |
939 | * They should not depend on each other and do not block. | |
1da177e4 | 940 | */ |
6712ecf8 | 941 | static void crypt_endio(struct bio *clone, int error) |
8b004457 | 942 | { |
028867ac | 943 | struct dm_crypt_io *io = clone->bi_private; |
49a8a920 | 944 | struct crypt_config *cc = io->cc; |
ee7a491e | 945 | unsigned rw = bio_data_dir(clone); |
8b004457 | 946 | |
adfe4770 MB |
947 | if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error)) |
948 | error = -EIO; | |
949 | ||
8b004457 | 950 | /* |
6712ecf8 | 951 | * free the processed pages |
8b004457 | 952 | */ |
ee7a491e | 953 | if (rw == WRITE) |
644bd2f0 | 954 | crypt_free_buffer_pages(cc, clone); |
8b004457 MB |
955 | |
956 | bio_put(clone); | |
8b004457 | 957 | |
ee7a491e MB |
958 | if (rw == READ && !error) { |
959 | kcryptd_queue_crypt(io); | |
960 | return; | |
961 | } | |
5742fd77 MB |
962 | |
963 | if (unlikely(error)) | |
964 | io->error = error; | |
965 | ||
966 | crypt_dec_pending(io); | |
8b004457 MB |
967 | } |
968 | ||
028867ac | 969 | static void clone_init(struct dm_crypt_io *io, struct bio *clone) |
8b004457 | 970 | { |
49a8a920 | 971 | struct crypt_config *cc = io->cc; |
8b004457 MB |
972 | |
973 | clone->bi_private = io; | |
974 | clone->bi_end_io = crypt_endio; | |
975 | clone->bi_bdev = cc->dev->bdev; | |
976 | clone->bi_rw = io->base_bio->bi_rw; | |
027581f3 | 977 | clone->bi_destructor = dm_crypt_bio_destructor; |
8b004457 MB |
978 | } |
979 | ||
20c82538 | 980 | static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) |
8b004457 | 981 | { |
49a8a920 | 982 | struct crypt_config *cc = io->cc; |
8b004457 MB |
983 | struct bio *base_bio = io->base_bio; |
984 | struct bio *clone; | |
93e605c2 | 985 | |
8b004457 MB |
986 | /* |
987 | * The block layer might modify the bvec array, so always | |
988 | * copy the required bvecs because we need the original | |
989 | * one in order to decrypt the whole bio data *afterwards*. | |
990 | */ | |
20c82538 | 991 | clone = bio_alloc_bioset(gfp, bio_segments(base_bio), cc->bs); |
7eaceacc | 992 | if (!clone) |
20c82538 | 993 | return 1; |
8b004457 | 994 | |
20c82538 MB |
995 | crypt_inc_pending(io); |
996 | ||
8b004457 MB |
997 | clone_init(io, clone); |
998 | clone->bi_idx = 0; | |
999 | clone->bi_vcnt = bio_segments(base_bio); | |
1000 | clone->bi_size = base_bio->bi_size; | |
0c395b0f | 1001 | clone->bi_sector = cc->start + io->sector; |
8b004457 MB |
1002 | memcpy(clone->bi_io_vec, bio_iovec(base_bio), |
1003 | sizeof(struct bio_vec) * clone->bi_vcnt); | |
8b004457 | 1004 | |
93e605c2 | 1005 | generic_make_request(clone); |
20c82538 | 1006 | return 0; |
8b004457 MB |
1007 | } |
1008 | ||
4e4eef64 MB |
1009 | static void kcryptd_io_write(struct dm_crypt_io *io) |
1010 | { | |
95497a96 | 1011 | struct bio *clone = io->ctx.bio_out; |
95497a96 | 1012 | generic_make_request(clone); |
4e4eef64 MB |
1013 | } |
1014 | ||
395b167c AK |
1015 | static void kcryptd_io(struct work_struct *work) |
1016 | { | |
1017 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); | |
1018 | ||
20c82538 MB |
1019 | if (bio_data_dir(io->base_bio) == READ) { |
1020 | crypt_inc_pending(io); | |
1021 | if (kcryptd_io_read(io, GFP_NOIO)) | |
1022 | io->error = -ENOMEM; | |
1023 | crypt_dec_pending(io); | |
1024 | } else | |
395b167c AK |
1025 | kcryptd_io_write(io); |
1026 | } | |
1027 | ||
1028 | static void kcryptd_queue_io(struct dm_crypt_io *io) | |
1029 | { | |
49a8a920 | 1030 | struct crypt_config *cc = io->cc; |
395b167c AK |
1031 | |
1032 | INIT_WORK(&io->work, kcryptd_io); | |
1033 | queue_work(cc->io_queue, &io->work); | |
1034 | } | |
1035 | ||
72c6e7af | 1036 | static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) |
4e4eef64 | 1037 | { |
dec1cedf | 1038 | struct bio *clone = io->ctx.bio_out; |
49a8a920 | 1039 | struct crypt_config *cc = io->cc; |
dec1cedf | 1040 | |
72c6e7af | 1041 | if (unlikely(io->error < 0)) { |
dec1cedf MB |
1042 | crypt_free_buffer_pages(cc, clone); |
1043 | bio_put(clone); | |
6c031f41 | 1044 | crypt_dec_pending(io); |
dec1cedf MB |
1045 | return; |
1046 | } | |
1047 | ||
1048 | /* crypt_convert should have filled the clone bio */ | |
1049 | BUG_ON(io->ctx.idx_out < clone->bi_vcnt); | |
1050 | ||
1051 | clone->bi_sector = cc->start + io->sector; | |
899c95d3 | 1052 | |
95497a96 MB |
1053 | if (async) |
1054 | kcryptd_queue_io(io); | |
1e37bb8e | 1055 | else |
95497a96 | 1056 | generic_make_request(clone); |
4e4eef64 MB |
1057 | } |
1058 | ||
fc5a5e9a | 1059 | static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) |
8b004457 | 1060 | { |
49a8a920 | 1061 | struct crypt_config *cc = io->cc; |
8b004457 | 1062 | struct bio *clone; |
393b47ef | 1063 | struct dm_crypt_io *new_io; |
c8081618 | 1064 | int crypt_finished; |
933f01d4 | 1065 | unsigned out_of_pages = 0; |
dec1cedf | 1066 | unsigned remaining = io->base_bio->bi_size; |
b635b00e | 1067 | sector_t sector = io->sector; |
dec1cedf | 1068 | int r; |
8b004457 | 1069 | |
fc5a5e9a MB |
1070 | /* |
1071 | * Prevent io from disappearing until this function completes. | |
1072 | */ | |
1073 | crypt_inc_pending(io); | |
b635b00e | 1074 | crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); |
fc5a5e9a | 1075 | |
93e605c2 MB |
1076 | /* |
1077 | * The allocated buffers can be smaller than the whole bio, | |
1078 | * so repeat the whole process until all the data can be handled. | |
1079 | */ | |
1080 | while (remaining) { | |
933f01d4 | 1081 | clone = crypt_alloc_buffer(io, remaining, &out_of_pages); |
23541d2d | 1082 | if (unlikely(!clone)) { |
5742fd77 | 1083 | io->error = -ENOMEM; |
fc5a5e9a | 1084 | break; |
23541d2d | 1085 | } |
93e605c2 | 1086 | |
53017030 MB |
1087 | io->ctx.bio_out = clone; |
1088 | io->ctx.idx_out = 0; | |
93e605c2 | 1089 | |
dec1cedf | 1090 | remaining -= clone->bi_size; |
b635b00e | 1091 | sector += bio_sectors(clone); |
93e605c2 | 1092 | |
4e594098 | 1093 | crypt_inc_pending(io); |
72c6e7af | 1094 | |
dec1cedf | 1095 | r = crypt_convert(cc, &io->ctx); |
72c6e7af MP |
1096 | if (r < 0) |
1097 | io->error = -EIO; | |
1098 | ||
40b6229b | 1099 | crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending); |
f97380bc | 1100 | |
c8081618 MB |
1101 | /* Encryption was already finished, submit io now */ |
1102 | if (crypt_finished) { | |
72c6e7af | 1103 | kcryptd_crypt_write_io_submit(io, 0); |
c8081618 MB |
1104 | |
1105 | /* | |
1106 | * If there was an error, do not try next fragments. | |
1107 | * For async, error is processed in async handler. | |
1108 | */ | |
6c031f41 | 1109 | if (unlikely(r < 0)) |
fc5a5e9a | 1110 | break; |
b635b00e MB |
1111 | |
1112 | io->sector = sector; | |
4e594098 | 1113 | } |
93e605c2 | 1114 | |
933f01d4 MB |
1115 | /* |
1116 | * Out of memory -> run queues | |
1117 | * But don't wait if split was due to the io size restriction | |
1118 | */ | |
1119 | if (unlikely(out_of_pages)) | |
8aa7e847 | 1120 | congestion_wait(BLK_RW_ASYNC, HZ/100); |
933f01d4 | 1121 | |
393b47ef MB |
1122 | /* |
1123 | * With async crypto it is unsafe to share the crypto context | |
1124 | * between fragments, so switch to a new dm_crypt_io structure. | |
1125 | */ | |
1126 | if (unlikely(!crypt_finished && remaining)) { | |
49a8a920 | 1127 | new_io = crypt_io_alloc(io->cc, io->base_bio, |
393b47ef MB |
1128 | sector); |
1129 | crypt_inc_pending(new_io); | |
1130 | crypt_convert_init(cc, &new_io->ctx, NULL, | |
1131 | io->base_bio, sector); | |
1132 | new_io->ctx.idx_in = io->ctx.idx_in; | |
1133 | new_io->ctx.offset_in = io->ctx.offset_in; | |
1134 | ||
1135 | /* | |
1136 | * Fragments after the first use the base_io | |
1137 | * pending count. | |
1138 | */ | |
1139 | if (!io->base_io) | |
1140 | new_io->base_io = io; | |
1141 | else { | |
1142 | new_io->base_io = io->base_io; | |
1143 | crypt_inc_pending(io->base_io); | |
1144 | crypt_dec_pending(io); | |
1145 | } | |
1146 | ||
1147 | io = new_io; | |
1148 | } | |
93e605c2 | 1149 | } |
899c95d3 MB |
1150 | |
1151 | crypt_dec_pending(io); | |
84131db6 MB |
1152 | } |
1153 | ||
72c6e7af | 1154 | static void kcryptd_crypt_read_done(struct dm_crypt_io *io) |
5742fd77 | 1155 | { |
5742fd77 MB |
1156 | crypt_dec_pending(io); |
1157 | } | |
1158 | ||
4e4eef64 | 1159 | static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) |
8b004457 | 1160 | { |
49a8a920 | 1161 | struct crypt_config *cc = io->cc; |
5742fd77 | 1162 | int r = 0; |
1da177e4 | 1163 | |
3e1a8bdd | 1164 | crypt_inc_pending(io); |
3a7f6c99 | 1165 | |
53017030 | 1166 | crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, |
0c395b0f | 1167 | io->sector); |
1da177e4 | 1168 | |
5742fd77 | 1169 | r = crypt_convert(cc, &io->ctx); |
72c6e7af MP |
1170 | if (r < 0) |
1171 | io->error = -EIO; | |
5742fd77 | 1172 | |
40b6229b | 1173 | if (atomic_dec_and_test(&io->ctx.cc_pending)) |
72c6e7af | 1174 | kcryptd_crypt_read_done(io); |
3a7f6c99 MB |
1175 | |
1176 | crypt_dec_pending(io); | |
1da177e4 LT |
1177 | } |
1178 | ||
95497a96 MB |
1179 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
1180 | int error) | |
1181 | { | |
b2174eeb HY |
1182 | struct dm_crypt_request *dmreq = async_req->data; |
1183 | struct convert_context *ctx = dmreq->ctx; | |
95497a96 | 1184 | struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); |
49a8a920 | 1185 | struct crypt_config *cc = io->cc; |
95497a96 MB |
1186 | |
1187 | if (error == -EINPROGRESS) { | |
1188 | complete(&ctx->restart); | |
1189 | return; | |
1190 | } | |
1191 | ||
2dc5327d MB |
1192 | if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) |
1193 | error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq); | |
1194 | ||
72c6e7af MP |
1195 | if (error < 0) |
1196 | io->error = -EIO; | |
1197 | ||
b2174eeb | 1198 | mempool_free(req_of_dmreq(cc, dmreq), cc->req_pool); |
95497a96 | 1199 | |
40b6229b | 1200 | if (!atomic_dec_and_test(&ctx->cc_pending)) |
95497a96 MB |
1201 | return; |
1202 | ||
1203 | if (bio_data_dir(io->base_bio) == READ) | |
72c6e7af | 1204 | kcryptd_crypt_read_done(io); |
95497a96 | 1205 | else |
72c6e7af | 1206 | kcryptd_crypt_write_io_submit(io, 1); |
95497a96 MB |
1207 | } |
1208 | ||
395b167c | 1209 | static void kcryptd_crypt(struct work_struct *work) |
1da177e4 | 1210 | { |
028867ac | 1211 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
8b004457 | 1212 | |
cabf08e4 | 1213 | if (bio_data_dir(io->base_bio) == READ) |
395b167c | 1214 | kcryptd_crypt_read_convert(io); |
4e4eef64 | 1215 | else |
395b167c | 1216 | kcryptd_crypt_write_convert(io); |
cabf08e4 MB |
1217 | } |
1218 | ||
395b167c | 1219 | static void kcryptd_queue_crypt(struct dm_crypt_io *io) |
cabf08e4 | 1220 | { |
49a8a920 | 1221 | struct crypt_config *cc = io->cc; |
cabf08e4 | 1222 | |
395b167c AK |
1223 | INIT_WORK(&io->work, kcryptd_crypt); |
1224 | queue_work(cc->crypt_queue, &io->work); | |
1da177e4 LT |
1225 | } |
1226 | ||
1227 | /* | |
1228 | * Decode key from its hex representation | |
1229 | */ | |
1230 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) | |
1231 | { | |
1232 | char buffer[3]; | |
1da177e4 LT |
1233 | unsigned int i; |
1234 | ||
1235 | buffer[2] = '\0'; | |
1236 | ||
8b004457 | 1237 | for (i = 0; i < size; i++) { |
1da177e4 LT |
1238 | buffer[0] = *hex++; |
1239 | buffer[1] = *hex++; | |
1240 | ||
1a66a08a | 1241 | if (kstrtou8(buffer, 16, &key[i])) |
1da177e4 LT |
1242 | return -EINVAL; |
1243 | } | |
1244 | ||
1245 | if (*hex != '\0') | |
1246 | return -EINVAL; | |
1247 | ||
1248 | return 0; | |
1249 | } | |
1250 | ||
1251 | /* | |
1252 | * Encode key into its hex representation | |
1253 | */ | |
1254 | static void crypt_encode_key(char *hex, u8 *key, unsigned int size) | |
1255 | { | |
1256 | unsigned int i; | |
1257 | ||
8b004457 | 1258 | for (i = 0; i < size; i++) { |
1da177e4 LT |
1259 | sprintf(hex, "%02x", *key); |
1260 | hex += 2; | |
1261 | key++; | |
1262 | } | |
1263 | } | |
1264 | ||
fd2d231f | 1265 | static void crypt_free_tfms(struct crypt_config *cc) |
d1f96423 | 1266 | { |
d1f96423 MB |
1267 | unsigned i; |
1268 | ||
fd2d231f MP |
1269 | if (!cc->tfms) |
1270 | return; | |
1271 | ||
d1f96423 | 1272 | for (i = 0; i < cc->tfms_count; i++) |
fd2d231f MP |
1273 | if (cc->tfms[i] && !IS_ERR(cc->tfms[i])) { |
1274 | crypto_free_ablkcipher(cc->tfms[i]); | |
1275 | cc->tfms[i] = NULL; | |
d1f96423 | 1276 | } |
fd2d231f MP |
1277 | |
1278 | kfree(cc->tfms); | |
1279 | cc->tfms = NULL; | |
d1f96423 MB |
1280 | } |
1281 | ||
fd2d231f | 1282 | static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) |
d1f96423 | 1283 | { |
d1f96423 MB |
1284 | unsigned i; |
1285 | int err; | |
1286 | ||
fd2d231f MP |
1287 | cc->tfms = kmalloc(cc->tfms_count * sizeof(struct crypto_ablkcipher *), |
1288 | GFP_KERNEL); | |
1289 | if (!cc->tfms) | |
1290 | return -ENOMEM; | |
1291 | ||
d1f96423 | 1292 | for (i = 0; i < cc->tfms_count; i++) { |
fd2d231f MP |
1293 | cc->tfms[i] = crypto_alloc_ablkcipher(ciphermode, 0, 0); |
1294 | if (IS_ERR(cc->tfms[i])) { | |
1295 | err = PTR_ERR(cc->tfms[i]); | |
1296 | crypt_free_tfms(cc); | |
d1f96423 MB |
1297 | return err; |
1298 | } | |
1299 | } | |
1300 | ||
1301 | return 0; | |
1302 | } | |
1303 | ||
c0297721 AK |
1304 | static int crypt_setkey_allcpus(struct crypt_config *cc) |
1305 | { | |
d1f96423 | 1306 | unsigned subkey_size = cc->key_size >> ilog2(cc->tfms_count); |
fd2d231f MP |
1307 | int err = 0, i, r; |
1308 | ||
1309 | for (i = 0; i < cc->tfms_count; i++) { | |
1310 | r = crypto_ablkcipher_setkey(cc->tfms[i], | |
1311 | cc->key + (i * subkey_size), | |
1312 | subkey_size); | |
1313 | if (r) | |
1314 | err = r; | |
c0297721 AK |
1315 | } |
1316 | ||
1317 | return err; | |
1318 | } | |
1319 | ||
e48d4bbf MB |
1320 | static int crypt_set_key(struct crypt_config *cc, char *key) |
1321 | { | |
de8be5ac MB |
1322 | int r = -EINVAL; |
1323 | int key_string_len = strlen(key); | |
1324 | ||
69a8cfcd | 1325 | /* The key size may not be changed. */ |
de8be5ac MB |
1326 | if (cc->key_size != (key_string_len >> 1)) |
1327 | goto out; | |
e48d4bbf | 1328 | |
69a8cfcd MB |
1329 | /* Hyphen (which gives a key_size of zero) means there is no key. */ |
1330 | if (!cc->key_size && strcmp(key, "-")) | |
de8be5ac | 1331 | goto out; |
e48d4bbf | 1332 | |
69a8cfcd | 1333 | if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0) |
de8be5ac | 1334 | goto out; |
e48d4bbf MB |
1335 | |
1336 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1337 | ||
de8be5ac MB |
1338 | r = crypt_setkey_allcpus(cc); |
1339 | ||
1340 | out: | |
1341 | /* Hex key string not needed after here, so wipe it. */ | |
1342 | memset(key, '0', key_string_len); | |
1343 | ||
1344 | return r; | |
e48d4bbf MB |
1345 | } |
1346 | ||
1347 | static int crypt_wipe_key(struct crypt_config *cc) | |
1348 | { | |
1349 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1350 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); | |
c0297721 AK |
1351 | |
1352 | return crypt_setkey_allcpus(cc); | |
e48d4bbf MB |
1353 | } |
1354 | ||
28513fcc MB |
1355 | static void crypt_dtr(struct dm_target *ti) |
1356 | { | |
1357 | struct crypt_config *cc = ti->private; | |
c0297721 AK |
1358 | struct crypt_cpu *cpu_cc; |
1359 | int cpu; | |
28513fcc MB |
1360 | |
1361 | ti->private = NULL; | |
1362 | ||
1363 | if (!cc) | |
1364 | return; | |
1365 | ||
1366 | if (cc->io_queue) | |
1367 | destroy_workqueue(cc->io_queue); | |
1368 | if (cc->crypt_queue) | |
1369 | destroy_workqueue(cc->crypt_queue); | |
1370 | ||
c0297721 AK |
1371 | if (cc->cpu) |
1372 | for_each_possible_cpu(cpu) { | |
1373 | cpu_cc = per_cpu_ptr(cc->cpu, cpu); | |
1374 | if (cpu_cc->req) | |
1375 | mempool_free(cpu_cc->req, cc->req_pool); | |
c0297721 AK |
1376 | } |
1377 | ||
fd2d231f MP |
1378 | crypt_free_tfms(cc); |
1379 | ||
28513fcc MB |
1380 | if (cc->bs) |
1381 | bioset_free(cc->bs); | |
1382 | ||
1383 | if (cc->page_pool) | |
1384 | mempool_destroy(cc->page_pool); | |
1385 | if (cc->req_pool) | |
1386 | mempool_destroy(cc->req_pool); | |
1387 | if (cc->io_pool) | |
1388 | mempool_destroy(cc->io_pool); | |
1389 | ||
1390 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) | |
1391 | cc->iv_gen_ops->dtr(cc); | |
1392 | ||
28513fcc MB |
1393 | if (cc->dev) |
1394 | dm_put_device(ti, cc->dev); | |
1395 | ||
c0297721 AK |
1396 | if (cc->cpu) |
1397 | free_percpu(cc->cpu); | |
1398 | ||
5ebaee6d | 1399 | kzfree(cc->cipher); |
7dbcd137 | 1400 | kzfree(cc->cipher_string); |
28513fcc MB |
1401 | |
1402 | /* Must zero key material before freeing */ | |
1403 | kzfree(cc); | |
1404 | } | |
1405 | ||
5ebaee6d MB |
1406 | static int crypt_ctr_cipher(struct dm_target *ti, |
1407 | char *cipher_in, char *key) | |
1da177e4 | 1408 | { |
5ebaee6d | 1409 | struct crypt_config *cc = ti->private; |
d1f96423 | 1410 | char *tmp, *cipher, *chainmode, *ivmode, *ivopts, *keycount; |
5ebaee6d | 1411 | char *cipher_api = NULL; |
fd2d231f | 1412 | int ret = -EINVAL; |
31998ef1 | 1413 | char dummy; |
1da177e4 | 1414 | |
5ebaee6d MB |
1415 | /* Convert to crypto api definition? */ |
1416 | if (strchr(cipher_in, '(')) { | |
1417 | ti->error = "Bad cipher specification"; | |
1da177e4 LT |
1418 | return -EINVAL; |
1419 | } | |
1420 | ||
7dbcd137 MB |
1421 | cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); |
1422 | if (!cc->cipher_string) | |
1423 | goto bad_mem; | |
1424 | ||
5ebaee6d MB |
1425 | /* |
1426 | * Legacy dm-crypt cipher specification | |
d1f96423 | 1427 | * cipher[:keycount]-mode-iv:ivopts |
5ebaee6d MB |
1428 | */ |
1429 | tmp = cipher_in; | |
d1f96423 MB |
1430 | keycount = strsep(&tmp, "-"); |
1431 | cipher = strsep(&keycount, ":"); | |
1432 | ||
1433 | if (!keycount) | |
1434 | cc->tfms_count = 1; | |
31998ef1 | 1435 | else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || |
d1f96423 MB |
1436 | !is_power_of_2(cc->tfms_count)) { |
1437 | ti->error = "Bad cipher key count specification"; | |
1438 | return -EINVAL; | |
1439 | } | |
1440 | cc->key_parts = cc->tfms_count; | |
5ebaee6d MB |
1441 | |
1442 | cc->cipher = kstrdup(cipher, GFP_KERNEL); | |
1443 | if (!cc->cipher) | |
1444 | goto bad_mem; | |
1445 | ||
1da177e4 LT |
1446 | chainmode = strsep(&tmp, "-"); |
1447 | ivopts = strsep(&tmp, "-"); | |
1448 | ivmode = strsep(&ivopts, ":"); | |
1449 | ||
1450 | if (tmp) | |
5ebaee6d | 1451 | DMWARN("Ignoring unexpected additional cipher options"); |
1da177e4 | 1452 | |
fd2d231f | 1453 | cc->cpu = __alloc_percpu(sizeof(*(cc->cpu)), |
d1f96423 | 1454 | __alignof__(struct crypt_cpu)); |
c0297721 AK |
1455 | if (!cc->cpu) { |
1456 | ti->error = "Cannot allocate per cpu state"; | |
1457 | goto bad_mem; | |
1458 | } | |
1459 | ||
7dbcd137 MB |
1460 | /* |
1461 | * For compatibility with the original dm-crypt mapping format, if | |
1462 | * only the cipher name is supplied, use cbc-plain. | |
1463 | */ | |
5ebaee6d | 1464 | if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) { |
1da177e4 LT |
1465 | chainmode = "cbc"; |
1466 | ivmode = "plain"; | |
1467 | } | |
1468 | ||
d1806f6a | 1469 | if (strcmp(chainmode, "ecb") && !ivmode) { |
5ebaee6d MB |
1470 | ti->error = "IV mechanism required"; |
1471 | return -EINVAL; | |
1da177e4 LT |
1472 | } |
1473 | ||
5ebaee6d MB |
1474 | cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); |
1475 | if (!cipher_api) | |
1476 | goto bad_mem; | |
1477 | ||
1478 | ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, | |
1479 | "%s(%s)", chainmode, cipher); | |
1480 | if (ret < 0) { | |
1481 | kfree(cipher_api); | |
1482 | goto bad_mem; | |
1da177e4 LT |
1483 | } |
1484 | ||
5ebaee6d | 1485 | /* Allocate cipher */ |
fd2d231f MP |
1486 | ret = crypt_alloc_tfms(cc, cipher_api); |
1487 | if (ret < 0) { | |
1488 | ti->error = "Error allocating crypto tfm"; | |
1489 | goto bad; | |
1da177e4 | 1490 | } |
1da177e4 | 1491 | |
5ebaee6d MB |
1492 | /* Initialize and set key */ |
1493 | ret = crypt_set_key(cc, key); | |
28513fcc | 1494 | if (ret < 0) { |
0b430958 | 1495 | ti->error = "Error decoding and setting key"; |
28513fcc | 1496 | goto bad; |
0b430958 MB |
1497 | } |
1498 | ||
5ebaee6d | 1499 | /* Initialize IV */ |
c0297721 | 1500 | cc->iv_size = crypto_ablkcipher_ivsize(any_tfm(cc)); |
5ebaee6d MB |
1501 | if (cc->iv_size) |
1502 | /* at least a 64 bit sector number should fit in our buffer */ | |
1503 | cc->iv_size = max(cc->iv_size, | |
1504 | (unsigned int)(sizeof(u64) / sizeof(u8))); | |
1505 | else if (ivmode) { | |
1506 | DMWARN("Selected cipher does not support IVs"); | |
1507 | ivmode = NULL; | |
1508 | } | |
1509 | ||
1510 | /* Choose ivmode, see comments at iv code. */ | |
1da177e4 LT |
1511 | if (ivmode == NULL) |
1512 | cc->iv_gen_ops = NULL; | |
1513 | else if (strcmp(ivmode, "plain") == 0) | |
1514 | cc->iv_gen_ops = &crypt_iv_plain_ops; | |
61afef61 MB |
1515 | else if (strcmp(ivmode, "plain64") == 0) |
1516 | cc->iv_gen_ops = &crypt_iv_plain64_ops; | |
1da177e4 LT |
1517 | else if (strcmp(ivmode, "essiv") == 0) |
1518 | cc->iv_gen_ops = &crypt_iv_essiv_ops; | |
48527fa7 RS |
1519 | else if (strcmp(ivmode, "benbi") == 0) |
1520 | cc->iv_gen_ops = &crypt_iv_benbi_ops; | |
46b47730 LN |
1521 | else if (strcmp(ivmode, "null") == 0) |
1522 | cc->iv_gen_ops = &crypt_iv_null_ops; | |
34745785 MB |
1523 | else if (strcmp(ivmode, "lmk") == 0) { |
1524 | cc->iv_gen_ops = &crypt_iv_lmk_ops; | |
1525 | /* Version 2 and 3 is recognised according | |
1526 | * to length of provided multi-key string. | |
1527 | * If present (version 3), last key is used as IV seed. | |
1528 | */ | |
1529 | if (cc->key_size % cc->key_parts) | |
1530 | cc->key_parts++; | |
1531 | } else { | |
5ebaee6d | 1532 | ret = -EINVAL; |
72d94861 | 1533 | ti->error = "Invalid IV mode"; |
28513fcc | 1534 | goto bad; |
1da177e4 LT |
1535 | } |
1536 | ||
28513fcc MB |
1537 | /* Allocate IV */ |
1538 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { | |
1539 | ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); | |
1540 | if (ret < 0) { | |
1541 | ti->error = "Error creating IV"; | |
1542 | goto bad; | |
1543 | } | |
1544 | } | |
1da177e4 | 1545 | |
28513fcc MB |
1546 | /* Initialize IV (set keys for ESSIV etc) */ |
1547 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) { | |
1548 | ret = cc->iv_gen_ops->init(cc); | |
1549 | if (ret < 0) { | |
1550 | ti->error = "Error initialising IV"; | |
1551 | goto bad; | |
1552 | } | |
b95bf2d3 MB |
1553 | } |
1554 | ||
5ebaee6d MB |
1555 | ret = 0; |
1556 | bad: | |
1557 | kfree(cipher_api); | |
1558 | return ret; | |
1559 | ||
1560 | bad_mem: | |
1561 | ti->error = "Cannot allocate cipher strings"; | |
1562 | return -ENOMEM; | |
1563 | } | |
1564 | ||
1565 | /* | |
1566 | * Construct an encryption mapping: | |
1567 | * <cipher> <key> <iv_offset> <dev_path> <start> | |
1568 | */ | |
1569 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
1570 | { | |
1571 | struct crypt_config *cc; | |
772ae5f5 | 1572 | unsigned int key_size, opt_params; |
5ebaee6d MB |
1573 | unsigned long long tmpll; |
1574 | int ret; | |
772ae5f5 MB |
1575 | struct dm_arg_set as; |
1576 | const char *opt_string; | |
31998ef1 | 1577 | char dummy; |
772ae5f5 MB |
1578 | |
1579 | static struct dm_arg _args[] = { | |
1580 | {0, 1, "Invalid number of feature args"}, | |
1581 | }; | |
5ebaee6d | 1582 | |
772ae5f5 | 1583 | if (argc < 5) { |
5ebaee6d MB |
1584 | ti->error = "Not enough arguments"; |
1585 | return -EINVAL; | |
1da177e4 LT |
1586 | } |
1587 | ||
5ebaee6d MB |
1588 | key_size = strlen(argv[1]) >> 1; |
1589 | ||
1590 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); | |
1591 | if (!cc) { | |
1592 | ti->error = "Cannot allocate encryption context"; | |
1593 | return -ENOMEM; | |
1594 | } | |
69a8cfcd | 1595 | cc->key_size = key_size; |
5ebaee6d MB |
1596 | |
1597 | ti->private = cc; | |
1598 | ret = crypt_ctr_cipher(ti, argv[0], argv[1]); | |
1599 | if (ret < 0) | |
1600 | goto bad; | |
1601 | ||
28513fcc | 1602 | ret = -ENOMEM; |
93d2341c | 1603 | cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool); |
1da177e4 | 1604 | if (!cc->io_pool) { |
72d94861 | 1605 | ti->error = "Cannot allocate crypt io mempool"; |
28513fcc | 1606 | goto bad; |
1da177e4 LT |
1607 | } |
1608 | ||
ddd42edf | 1609 | cc->dmreq_start = sizeof(struct ablkcipher_request); |
c0297721 | 1610 | cc->dmreq_start += crypto_ablkcipher_reqsize(any_tfm(cc)); |
ddd42edf | 1611 | cc->dmreq_start = ALIGN(cc->dmreq_start, crypto_tfm_ctx_alignment()); |
c0297721 | 1612 | cc->dmreq_start += crypto_ablkcipher_alignmask(any_tfm(cc)) & |
3a7f6c99 | 1613 | ~(crypto_tfm_ctx_alignment() - 1); |
ddd42edf MB |
1614 | |
1615 | cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + | |
1616 | sizeof(struct dm_crypt_request) + cc->iv_size); | |
1617 | if (!cc->req_pool) { | |
1618 | ti->error = "Cannot allocate crypt request mempool"; | |
28513fcc | 1619 | goto bad; |
ddd42edf | 1620 | } |
ddd42edf | 1621 | |
a19b27ce | 1622 | cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0); |
1da177e4 | 1623 | if (!cc->page_pool) { |
72d94861 | 1624 | ti->error = "Cannot allocate page mempool"; |
28513fcc | 1625 | goto bad; |
1da177e4 LT |
1626 | } |
1627 | ||
bb799ca0 | 1628 | cc->bs = bioset_create(MIN_IOS, 0); |
6a24c718 MB |
1629 | if (!cc->bs) { |
1630 | ti->error = "Cannot allocate crypt bioset"; | |
28513fcc | 1631 | goto bad; |
6a24c718 MB |
1632 | } |
1633 | ||
28513fcc | 1634 | ret = -EINVAL; |
31998ef1 | 1635 | if (sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1636 | ti->error = "Invalid iv_offset sector"; |
28513fcc | 1637 | goto bad; |
1da177e4 | 1638 | } |
4ee218cd | 1639 | cc->iv_offset = tmpll; |
1da177e4 | 1640 | |
28513fcc MB |
1641 | if (dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev)) { |
1642 | ti->error = "Device lookup failed"; | |
1643 | goto bad; | |
1644 | } | |
1645 | ||
31998ef1 | 1646 | if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1647 | ti->error = "Invalid device sector"; |
28513fcc | 1648 | goto bad; |
1da177e4 | 1649 | } |
4ee218cd | 1650 | cc->start = tmpll; |
1da177e4 | 1651 | |
772ae5f5 MB |
1652 | argv += 5; |
1653 | argc -= 5; | |
1654 | ||
1655 | /* Optional parameters */ | |
1656 | if (argc) { | |
1657 | as.argc = argc; | |
1658 | as.argv = argv; | |
1659 | ||
1660 | ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); | |
1661 | if (ret) | |
1662 | goto bad; | |
1663 | ||
1664 | opt_string = dm_shift_arg(&as); | |
1665 | ||
1666 | if (opt_params == 1 && opt_string && | |
1667 | !strcasecmp(opt_string, "allow_discards")) | |
1668 | ti->num_discard_requests = 1; | |
1669 | else if (opt_params) { | |
1670 | ret = -EINVAL; | |
1671 | ti->error = "Invalid feature arguments"; | |
1672 | goto bad; | |
1673 | } | |
1674 | } | |
1675 | ||
28513fcc | 1676 | ret = -ENOMEM; |
c0297721 AK |
1677 | cc->io_queue = alloc_workqueue("kcryptd_io", |
1678 | WQ_NON_REENTRANT| | |
1679 | WQ_MEM_RECLAIM, | |
1680 | 1); | |
cabf08e4 MB |
1681 | if (!cc->io_queue) { |
1682 | ti->error = "Couldn't create kcryptd io queue"; | |
28513fcc | 1683 | goto bad; |
cabf08e4 MB |
1684 | } |
1685 | ||
c0297721 AK |
1686 | cc->crypt_queue = alloc_workqueue("kcryptd", |
1687 | WQ_NON_REENTRANT| | |
1688 | WQ_CPU_INTENSIVE| | |
1689 | WQ_MEM_RECLAIM, | |
1690 | 1); | |
cabf08e4 | 1691 | if (!cc->crypt_queue) { |
9934a8be | 1692 | ti->error = "Couldn't create kcryptd queue"; |
28513fcc | 1693 | goto bad; |
9934a8be MB |
1694 | } |
1695 | ||
647c7db1 | 1696 | ti->num_flush_requests = 1; |
0ac55489 | 1697 | ti->discard_zeroes_data_unsupported = true; |
983c7db3 | 1698 | |
1da177e4 LT |
1699 | return 0; |
1700 | ||
28513fcc MB |
1701 | bad: |
1702 | crypt_dtr(ti); | |
1703 | return ret; | |
1da177e4 LT |
1704 | } |
1705 | ||
1da177e4 LT |
1706 | static int crypt_map(struct dm_target *ti, struct bio *bio, |
1707 | union map_info *map_context) | |
1708 | { | |
028867ac | 1709 | struct dm_crypt_io *io; |
49a8a920 | 1710 | struct crypt_config *cc = ti->private; |
647c7db1 | 1711 | |
772ae5f5 MB |
1712 | /* |
1713 | * If bio is REQ_FLUSH or REQ_DISCARD, just bypass crypt queues. | |
1714 | * - for REQ_FLUSH device-mapper core ensures that no IO is in-flight | |
1715 | * - for REQ_DISCARD caller must use flush if IO ordering matters | |
1716 | */ | |
1717 | if (unlikely(bio->bi_rw & (REQ_FLUSH | REQ_DISCARD))) { | |
647c7db1 | 1718 | bio->bi_bdev = cc->dev->bdev; |
772ae5f5 MB |
1719 | if (bio_sectors(bio)) |
1720 | bio->bi_sector = cc->start + dm_target_offset(ti, bio->bi_sector); | |
647c7db1 MP |
1721 | return DM_MAPIO_REMAPPED; |
1722 | } | |
1da177e4 | 1723 | |
49a8a920 | 1724 | io = crypt_io_alloc(cc, bio, dm_target_offset(ti, bio->bi_sector)); |
cabf08e4 | 1725 | |
20c82538 MB |
1726 | if (bio_data_dir(io->base_bio) == READ) { |
1727 | if (kcryptd_io_read(io, GFP_NOWAIT)) | |
1728 | kcryptd_queue_io(io); | |
1729 | } else | |
cabf08e4 | 1730 | kcryptd_queue_crypt(io); |
1da177e4 | 1731 | |
d2a7ad29 | 1732 | return DM_MAPIO_SUBMITTED; |
1da177e4 LT |
1733 | } |
1734 | ||
1735 | static int crypt_status(struct dm_target *ti, status_type_t type, | |
1736 | char *result, unsigned int maxlen) | |
1737 | { | |
5ebaee6d | 1738 | struct crypt_config *cc = ti->private; |
1da177e4 LT |
1739 | unsigned int sz = 0; |
1740 | ||
1741 | switch (type) { | |
1742 | case STATUSTYPE_INFO: | |
1743 | result[0] = '\0'; | |
1744 | break; | |
1745 | ||
1746 | case STATUSTYPE_TABLE: | |
7dbcd137 | 1747 | DMEMIT("%s ", cc->cipher_string); |
1da177e4 LT |
1748 | |
1749 | if (cc->key_size > 0) { | |
1750 | if ((maxlen - sz) < ((cc->key_size << 1) + 1)) | |
1751 | return -ENOMEM; | |
1752 | ||
1753 | crypt_encode_key(result + sz, cc->key, cc->key_size); | |
1754 | sz += cc->key_size << 1; | |
1755 | } else { | |
1756 | if (sz >= maxlen) | |
1757 | return -ENOMEM; | |
1758 | result[sz++] = '-'; | |
1759 | } | |
1760 | ||
4ee218cd AM |
1761 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
1762 | cc->dev->name, (unsigned long long)cc->start); | |
772ae5f5 MB |
1763 | |
1764 | if (ti->num_discard_requests) | |
1765 | DMEMIT(" 1 allow_discards"); | |
1766 | ||
1da177e4 LT |
1767 | break; |
1768 | } | |
1769 | return 0; | |
1770 | } | |
1771 | ||
e48d4bbf MB |
1772 | static void crypt_postsuspend(struct dm_target *ti) |
1773 | { | |
1774 | struct crypt_config *cc = ti->private; | |
1775 | ||
1776 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1777 | } | |
1778 | ||
1779 | static int crypt_preresume(struct dm_target *ti) | |
1780 | { | |
1781 | struct crypt_config *cc = ti->private; | |
1782 | ||
1783 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { | |
1784 | DMERR("aborting resume - crypt key is not set."); | |
1785 | return -EAGAIN; | |
1786 | } | |
1787 | ||
1788 | return 0; | |
1789 | } | |
1790 | ||
1791 | static void crypt_resume(struct dm_target *ti) | |
1792 | { | |
1793 | struct crypt_config *cc = ti->private; | |
1794 | ||
1795 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1796 | } | |
1797 | ||
1798 | /* Message interface | |
1799 | * key set <key> | |
1800 | * key wipe | |
1801 | */ | |
1802 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) | |
1803 | { | |
1804 | struct crypt_config *cc = ti->private; | |
542da317 | 1805 | int ret = -EINVAL; |
e48d4bbf MB |
1806 | |
1807 | if (argc < 2) | |
1808 | goto error; | |
1809 | ||
498f0103 | 1810 | if (!strcasecmp(argv[0], "key")) { |
e48d4bbf MB |
1811 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { |
1812 | DMWARN("not suspended during key manipulation."); | |
1813 | return -EINVAL; | |
1814 | } | |
498f0103 | 1815 | if (argc == 3 && !strcasecmp(argv[1], "set")) { |
542da317 MB |
1816 | ret = crypt_set_key(cc, argv[2]); |
1817 | if (ret) | |
1818 | return ret; | |
1819 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) | |
1820 | ret = cc->iv_gen_ops->init(cc); | |
1821 | return ret; | |
1822 | } | |
498f0103 | 1823 | if (argc == 2 && !strcasecmp(argv[1], "wipe")) { |
542da317 MB |
1824 | if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { |
1825 | ret = cc->iv_gen_ops->wipe(cc); | |
1826 | if (ret) | |
1827 | return ret; | |
1828 | } | |
e48d4bbf | 1829 | return crypt_wipe_key(cc); |
542da317 | 1830 | } |
e48d4bbf MB |
1831 | } |
1832 | ||
1833 | error: | |
1834 | DMWARN("unrecognised message received."); | |
1835 | return -EINVAL; | |
1836 | } | |
1837 | ||
d41e26b9 MB |
1838 | static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm, |
1839 | struct bio_vec *biovec, int max_size) | |
1840 | { | |
1841 | struct crypt_config *cc = ti->private; | |
1842 | struct request_queue *q = bdev_get_queue(cc->dev->bdev); | |
1843 | ||
1844 | if (!q->merge_bvec_fn) | |
1845 | return max_size; | |
1846 | ||
1847 | bvm->bi_bdev = cc->dev->bdev; | |
b441a262 | 1848 | bvm->bi_sector = cc->start + dm_target_offset(ti, bvm->bi_sector); |
d41e26b9 MB |
1849 | |
1850 | return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); | |
1851 | } | |
1852 | ||
af4874e0 MS |
1853 | static int crypt_iterate_devices(struct dm_target *ti, |
1854 | iterate_devices_callout_fn fn, void *data) | |
1855 | { | |
1856 | struct crypt_config *cc = ti->private; | |
1857 | ||
5dea271b | 1858 | return fn(ti, cc->dev, cc->start, ti->len, data); |
af4874e0 MS |
1859 | } |
1860 | ||
1da177e4 LT |
1861 | static struct target_type crypt_target = { |
1862 | .name = "crypt", | |
772ae5f5 | 1863 | .version = {1, 11, 0}, |
1da177e4 LT |
1864 | .module = THIS_MODULE, |
1865 | .ctr = crypt_ctr, | |
1866 | .dtr = crypt_dtr, | |
1867 | .map = crypt_map, | |
1868 | .status = crypt_status, | |
e48d4bbf MB |
1869 | .postsuspend = crypt_postsuspend, |
1870 | .preresume = crypt_preresume, | |
1871 | .resume = crypt_resume, | |
1872 | .message = crypt_message, | |
d41e26b9 | 1873 | .merge = crypt_merge, |
af4874e0 | 1874 | .iterate_devices = crypt_iterate_devices, |
1da177e4 LT |
1875 | }; |
1876 | ||
1877 | static int __init dm_crypt_init(void) | |
1878 | { | |
1879 | int r; | |
1880 | ||
028867ac | 1881 | _crypt_io_pool = KMEM_CACHE(dm_crypt_io, 0); |
1da177e4 LT |
1882 | if (!_crypt_io_pool) |
1883 | return -ENOMEM; | |
1884 | ||
1da177e4 LT |
1885 | r = dm_register_target(&crypt_target); |
1886 | if (r < 0) { | |
72d94861 | 1887 | DMERR("register failed %d", r); |
9934a8be | 1888 | kmem_cache_destroy(_crypt_io_pool); |
1da177e4 LT |
1889 | } |
1890 | ||
1da177e4 LT |
1891 | return r; |
1892 | } | |
1893 | ||
1894 | static void __exit dm_crypt_exit(void) | |
1895 | { | |
10d3bd09 | 1896 | dm_unregister_target(&crypt_target); |
1da177e4 LT |
1897 | kmem_cache_destroy(_crypt_io_pool); |
1898 | } | |
1899 | ||
1900 | module_init(dm_crypt_init); | |
1901 | module_exit(dm_crypt_exit); | |
1902 | ||
1903 | MODULE_AUTHOR("Christophe Saout <christophe@saout.de>"); | |
1904 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); | |
1905 | MODULE_LICENSE("GPL"); |