Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2003 Christophe Saout <christophe@saout.de> | |
3 | * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org> | |
542da317 | 4 | * Copyright (C) 2006-2009 Red Hat, Inc. All rights reserved. |
ed04d981 | 5 | * Copyright (C) 2013 Milan Broz <gmazyland@gmail.com> |
1da177e4 LT |
6 | * |
7 | * This file is released under the GPL. | |
8 | */ | |
9 | ||
43d69034 | 10 | #include <linux/completion.h> |
d1806f6a | 11 | #include <linux/err.h> |
1da177e4 LT |
12 | #include <linux/module.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/bio.h> | |
16 | #include <linux/blkdev.h> | |
17 | #include <linux/mempool.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/crypto.h> | |
20 | #include <linux/workqueue.h> | |
3fcfab16 | 21 | #include <linux/backing-dev.h> |
c0297721 | 22 | #include <linux/percpu.h> |
60063497 | 23 | #include <linux/atomic.h> |
378f058c | 24 | #include <linux/scatterlist.h> |
1da177e4 | 25 | #include <asm/page.h> |
48527fa7 | 26 | #include <asm/unaligned.h> |
34745785 MB |
27 | #include <crypto/hash.h> |
28 | #include <crypto/md5.h> | |
29 | #include <crypto/algapi.h> | |
1da177e4 | 30 | |
586e80e6 | 31 | #include <linux/device-mapper.h> |
1da177e4 | 32 | |
72d94861 | 33 | #define DM_MSG_PREFIX "crypt" |
1da177e4 | 34 | |
1da177e4 LT |
35 | /* |
36 | * context holding the current state of a multi-part conversion | |
37 | */ | |
38 | struct convert_context { | |
43d69034 | 39 | struct completion restart; |
1da177e4 LT |
40 | struct bio *bio_in; |
41 | struct bio *bio_out; | |
003b5c57 KO |
42 | struct bvec_iter iter_in; |
43 | struct bvec_iter iter_out; | |
c66029f4 | 44 | sector_t cc_sector; |
40b6229b | 45 | atomic_t cc_pending; |
1da177e4 LT |
46 | }; |
47 | ||
53017030 MB |
48 | /* |
49 | * per bio private data | |
50 | */ | |
51 | struct dm_crypt_io { | |
49a8a920 | 52 | struct crypt_config *cc; |
53017030 MB |
53 | struct bio *base_bio; |
54 | struct work_struct work; | |
55 | ||
56 | struct convert_context ctx; | |
57 | ||
40b6229b | 58 | atomic_t io_pending; |
53017030 | 59 | int error; |
0c395b0f | 60 | sector_t sector; |
393b47ef | 61 | struct dm_crypt_io *base_io; |
53017030 MB |
62 | }; |
63 | ||
01482b76 | 64 | struct dm_crypt_request { |
b2174eeb | 65 | struct convert_context *ctx; |
01482b76 MB |
66 | struct scatterlist sg_in; |
67 | struct scatterlist sg_out; | |
2dc5327d | 68 | sector_t iv_sector; |
01482b76 MB |
69 | }; |
70 | ||
1da177e4 LT |
71 | struct crypt_config; |
72 | ||
73 | struct crypt_iv_operations { | |
74 | int (*ctr)(struct crypt_config *cc, struct dm_target *ti, | |
d469f841 | 75 | const char *opts); |
1da177e4 | 76 | void (*dtr)(struct crypt_config *cc); |
b95bf2d3 | 77 | int (*init)(struct crypt_config *cc); |
542da317 | 78 | int (*wipe)(struct crypt_config *cc); |
2dc5327d MB |
79 | int (*generator)(struct crypt_config *cc, u8 *iv, |
80 | struct dm_crypt_request *dmreq); | |
81 | int (*post)(struct crypt_config *cc, u8 *iv, | |
82 | struct dm_crypt_request *dmreq); | |
1da177e4 LT |
83 | }; |
84 | ||
60473592 | 85 | struct iv_essiv_private { |
b95bf2d3 MB |
86 | struct crypto_hash *hash_tfm; |
87 | u8 *salt; | |
60473592 MB |
88 | }; |
89 | ||
90 | struct iv_benbi_private { | |
91 | int shift; | |
92 | }; | |
93 | ||
34745785 MB |
94 | #define LMK_SEED_SIZE 64 /* hash + 0 */ |
95 | struct iv_lmk_private { | |
96 | struct crypto_shash *hash_tfm; | |
97 | u8 *seed; | |
98 | }; | |
99 | ||
ed04d981 MB |
100 | #define TCW_WHITENING_SIZE 16 |
101 | struct iv_tcw_private { | |
102 | struct crypto_shash *crc32_tfm; | |
103 | u8 *iv_seed; | |
104 | u8 *whitening; | |
105 | }; | |
106 | ||
1da177e4 LT |
107 | /* |
108 | * Crypt: maps a linear range of a block device | |
109 | * and encrypts / decrypts at the same time. | |
110 | */ | |
e48d4bbf | 111 | enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID }; |
c0297721 AK |
112 | |
113 | /* | |
114 | * Duplicated per-CPU state for cipher. | |
115 | */ | |
116 | struct crypt_cpu { | |
117 | struct ablkcipher_request *req; | |
c0297721 AK |
118 | }; |
119 | ||
120 | /* | |
121 | * The fields in here must be read only after initialization, | |
122 | * changing state should be in crypt_cpu. | |
123 | */ | |
1da177e4 LT |
124 | struct crypt_config { |
125 | struct dm_dev *dev; | |
126 | sector_t start; | |
127 | ||
128 | /* | |
ddd42edf MB |
129 | * pool for per bio private data, crypto requests and |
130 | * encryption requeusts/buffer pages | |
1da177e4 LT |
131 | */ |
132 | mempool_t *io_pool; | |
ddd42edf | 133 | mempool_t *req_pool; |
1da177e4 | 134 | mempool_t *page_pool; |
6a24c718 | 135 | struct bio_set *bs; |
1da177e4 | 136 | |
cabf08e4 MB |
137 | struct workqueue_struct *io_queue; |
138 | struct workqueue_struct *crypt_queue; | |
3f1e9070 | 139 | |
5ebaee6d | 140 | char *cipher; |
7dbcd137 | 141 | char *cipher_string; |
5ebaee6d | 142 | |
1da177e4 | 143 | struct crypt_iv_operations *iv_gen_ops; |
79066ad3 | 144 | union { |
60473592 MB |
145 | struct iv_essiv_private essiv; |
146 | struct iv_benbi_private benbi; | |
34745785 | 147 | struct iv_lmk_private lmk; |
ed04d981 | 148 | struct iv_tcw_private tcw; |
79066ad3 | 149 | } iv_gen_private; |
1da177e4 LT |
150 | sector_t iv_offset; |
151 | unsigned int iv_size; | |
152 | ||
c0297721 AK |
153 | /* |
154 | * Duplicated per cpu state. Access through | |
155 | * per_cpu_ptr() only. | |
156 | */ | |
157 | struct crypt_cpu __percpu *cpu; | |
fd2d231f MP |
158 | |
159 | /* ESSIV: struct crypto_cipher *essiv_tfm */ | |
160 | void *iv_private; | |
161 | struct crypto_ablkcipher **tfms; | |
d1f96423 | 162 | unsigned tfms_count; |
c0297721 | 163 | |
ddd42edf MB |
164 | /* |
165 | * Layout of each crypto request: | |
166 | * | |
167 | * struct ablkcipher_request | |
168 | * context | |
169 | * padding | |
170 | * struct dm_crypt_request | |
171 | * padding | |
172 | * IV | |
173 | * | |
174 | * The padding is added so that dm_crypt_request and the IV are | |
175 | * correctly aligned. | |
176 | */ | |
177 | unsigned int dmreq_start; | |
ddd42edf | 178 | |
e48d4bbf | 179 | unsigned long flags; |
1da177e4 | 180 | unsigned int key_size; |
da31a078 MB |
181 | unsigned int key_parts; /* independent parts in key buffer */ |
182 | unsigned int key_extra_size; /* additional keys length */ | |
1da177e4 LT |
183 | u8 key[0]; |
184 | }; | |
185 | ||
6a24c718 | 186 | #define MIN_IOS 16 |
1da177e4 | 187 | #define MIN_POOL_PAGES 32 |
1da177e4 | 188 | |
e18b890b | 189 | static struct kmem_cache *_crypt_io_pool; |
1da177e4 | 190 | |
028867ac | 191 | static void clone_init(struct dm_crypt_io *, struct bio *); |
395b167c | 192 | static void kcryptd_queue_crypt(struct dm_crypt_io *io); |
2dc5327d | 193 | static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq); |
027581f3 | 194 | |
c0297721 AK |
195 | static struct crypt_cpu *this_crypt_config(struct crypt_config *cc) |
196 | { | |
197 | return this_cpu_ptr(cc->cpu); | |
198 | } | |
199 | ||
200 | /* | |
201 | * Use this to access cipher attributes that are the same for each CPU. | |
202 | */ | |
203 | static struct crypto_ablkcipher *any_tfm(struct crypt_config *cc) | |
204 | { | |
fd2d231f | 205 | return cc->tfms[0]; |
c0297721 AK |
206 | } |
207 | ||
1da177e4 LT |
208 | /* |
209 | * Different IV generation algorithms: | |
210 | * | |
3c164bd8 | 211 | * plain: the initial vector is the 32-bit little-endian version of the sector |
3a4fa0a2 | 212 | * number, padded with zeros if necessary. |
1da177e4 | 213 | * |
61afef61 MB |
214 | * plain64: the initial vector is the 64-bit little-endian version of the sector |
215 | * number, padded with zeros if necessary. | |
216 | * | |
3c164bd8 RS |
217 | * essiv: "encrypted sector|salt initial vector", the sector number is |
218 | * encrypted with the bulk cipher using a salt as key. The salt | |
219 | * should be derived from the bulk cipher's key via hashing. | |
1da177e4 | 220 | * |
48527fa7 RS |
221 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
222 | * (needed for LRW-32-AES and possible other narrow block modes) | |
223 | * | |
46b47730 LN |
224 | * null: the initial vector is always zero. Provides compatibility with |
225 | * obsolete loop_fish2 devices. Do not use for new devices. | |
226 | * | |
34745785 MB |
227 | * lmk: Compatible implementation of the block chaining mode used |
228 | * by the Loop-AES block device encryption system | |
229 | * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ | |
230 | * It operates on full 512 byte sectors and uses CBC | |
231 | * with an IV derived from the sector number, the data and | |
232 | * optionally extra IV seed. | |
233 | * This means that after decryption the first block | |
234 | * of sector must be tweaked according to decrypted data. | |
235 | * Loop-AES can use three encryption schemes: | |
236 | * version 1: is plain aes-cbc mode | |
237 | * version 2: uses 64 multikey scheme with lmk IV generator | |
238 | * version 3: the same as version 2 with additional IV seed | |
239 | * (it uses 65 keys, last key is used as IV seed) | |
240 | * | |
ed04d981 MB |
241 | * tcw: Compatible implementation of the block chaining mode used |
242 | * by the TrueCrypt device encryption system (prior to version 4.1). | |
243 | * For more info see: http://www.truecrypt.org | |
244 | * It operates on full 512 byte sectors and uses CBC | |
245 | * with an IV derived from initial key and the sector number. | |
246 | * In addition, whitening value is applied on every sector, whitening | |
247 | * is calculated from initial key, sector number and mixed using CRC32. | |
248 | * Note that this encryption scheme is vulnerable to watermarking attacks | |
249 | * and should be used for old compatible containers access only. | |
250 | * | |
1da177e4 LT |
251 | * plumb: unimplemented, see: |
252 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 | |
253 | */ | |
254 | ||
2dc5327d MB |
255 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, |
256 | struct dm_crypt_request *dmreq) | |
1da177e4 LT |
257 | { |
258 | memset(iv, 0, cc->iv_size); | |
283a8328 | 259 | *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); |
1da177e4 LT |
260 | |
261 | return 0; | |
262 | } | |
263 | ||
61afef61 | 264 | static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, |
2dc5327d | 265 | struct dm_crypt_request *dmreq) |
61afef61 MB |
266 | { |
267 | memset(iv, 0, cc->iv_size); | |
283a8328 | 268 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
61afef61 MB |
269 | |
270 | return 0; | |
271 | } | |
272 | ||
b95bf2d3 MB |
273 | /* Initialise ESSIV - compute salt but no local memory allocations */ |
274 | static int crypt_iv_essiv_init(struct crypt_config *cc) | |
275 | { | |
276 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
277 | struct hash_desc desc; | |
278 | struct scatterlist sg; | |
c0297721 | 279 | struct crypto_cipher *essiv_tfm; |
fd2d231f | 280 | int err; |
b95bf2d3 MB |
281 | |
282 | sg_init_one(&sg, cc->key, cc->key_size); | |
283 | desc.tfm = essiv->hash_tfm; | |
284 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
285 | ||
286 | err = crypto_hash_digest(&desc, &sg, cc->key_size, essiv->salt); | |
287 | if (err) | |
288 | return err; | |
289 | ||
fd2d231f | 290 | essiv_tfm = cc->iv_private; |
c0297721 | 291 | |
fd2d231f MP |
292 | err = crypto_cipher_setkey(essiv_tfm, essiv->salt, |
293 | crypto_hash_digestsize(essiv->hash_tfm)); | |
294 | if (err) | |
295 | return err; | |
c0297721 AK |
296 | |
297 | return 0; | |
b95bf2d3 MB |
298 | } |
299 | ||
542da317 MB |
300 | /* Wipe salt and reset key derived from volume key */ |
301 | static int crypt_iv_essiv_wipe(struct crypt_config *cc) | |
302 | { | |
303 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
304 | unsigned salt_size = crypto_hash_digestsize(essiv->hash_tfm); | |
c0297721 | 305 | struct crypto_cipher *essiv_tfm; |
fd2d231f | 306 | int r, err = 0; |
542da317 MB |
307 | |
308 | memset(essiv->salt, 0, salt_size); | |
309 | ||
fd2d231f MP |
310 | essiv_tfm = cc->iv_private; |
311 | r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size); | |
312 | if (r) | |
313 | err = r; | |
c0297721 AK |
314 | |
315 | return err; | |
316 | } | |
317 | ||
318 | /* Set up per cpu cipher state */ | |
319 | static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc, | |
320 | struct dm_target *ti, | |
321 | u8 *salt, unsigned saltsize) | |
322 | { | |
323 | struct crypto_cipher *essiv_tfm; | |
324 | int err; | |
325 | ||
326 | /* Setup the essiv_tfm with the given salt */ | |
327 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); | |
328 | if (IS_ERR(essiv_tfm)) { | |
329 | ti->error = "Error allocating crypto tfm for ESSIV"; | |
330 | return essiv_tfm; | |
331 | } | |
332 | ||
333 | if (crypto_cipher_blocksize(essiv_tfm) != | |
334 | crypto_ablkcipher_ivsize(any_tfm(cc))) { | |
335 | ti->error = "Block size of ESSIV cipher does " | |
336 | "not match IV size of block cipher"; | |
337 | crypto_free_cipher(essiv_tfm); | |
338 | return ERR_PTR(-EINVAL); | |
339 | } | |
340 | ||
341 | err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); | |
342 | if (err) { | |
343 | ti->error = "Failed to set key for ESSIV cipher"; | |
344 | crypto_free_cipher(essiv_tfm); | |
345 | return ERR_PTR(err); | |
346 | } | |
347 | ||
348 | return essiv_tfm; | |
542da317 MB |
349 | } |
350 | ||
60473592 MB |
351 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) |
352 | { | |
c0297721 | 353 | struct crypto_cipher *essiv_tfm; |
60473592 MB |
354 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; |
355 | ||
b95bf2d3 MB |
356 | crypto_free_hash(essiv->hash_tfm); |
357 | essiv->hash_tfm = NULL; | |
358 | ||
359 | kzfree(essiv->salt); | |
360 | essiv->salt = NULL; | |
c0297721 | 361 | |
fd2d231f | 362 | essiv_tfm = cc->iv_private; |
c0297721 | 363 | |
fd2d231f MP |
364 | if (essiv_tfm) |
365 | crypto_free_cipher(essiv_tfm); | |
c0297721 | 366 | |
fd2d231f | 367 | cc->iv_private = NULL; |
60473592 MB |
368 | } |
369 | ||
1da177e4 | 370 | static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, |
d469f841 | 371 | const char *opts) |
1da177e4 | 372 | { |
5861f1be MB |
373 | struct crypto_cipher *essiv_tfm = NULL; |
374 | struct crypto_hash *hash_tfm = NULL; | |
5861f1be | 375 | u8 *salt = NULL; |
fd2d231f | 376 | int err; |
1da177e4 | 377 | |
5861f1be | 378 | if (!opts) { |
72d94861 | 379 | ti->error = "Digest algorithm missing for ESSIV mode"; |
1da177e4 LT |
380 | return -EINVAL; |
381 | } | |
382 | ||
b95bf2d3 | 383 | /* Allocate hash algorithm */ |
35058687 HX |
384 | hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC); |
385 | if (IS_ERR(hash_tfm)) { | |
72d94861 | 386 | ti->error = "Error initializing ESSIV hash"; |
5861f1be MB |
387 | err = PTR_ERR(hash_tfm); |
388 | goto bad; | |
1da177e4 LT |
389 | } |
390 | ||
b95bf2d3 | 391 | salt = kzalloc(crypto_hash_digestsize(hash_tfm), GFP_KERNEL); |
5861f1be | 392 | if (!salt) { |
72d94861 | 393 | ti->error = "Error kmallocing salt storage in ESSIV"; |
5861f1be MB |
394 | err = -ENOMEM; |
395 | goto bad; | |
1da177e4 LT |
396 | } |
397 | ||
b95bf2d3 | 398 | cc->iv_gen_private.essiv.salt = salt; |
b95bf2d3 MB |
399 | cc->iv_gen_private.essiv.hash_tfm = hash_tfm; |
400 | ||
fd2d231f MP |
401 | essiv_tfm = setup_essiv_cpu(cc, ti, salt, |
402 | crypto_hash_digestsize(hash_tfm)); | |
403 | if (IS_ERR(essiv_tfm)) { | |
404 | crypt_iv_essiv_dtr(cc); | |
405 | return PTR_ERR(essiv_tfm); | |
c0297721 | 406 | } |
fd2d231f | 407 | cc->iv_private = essiv_tfm; |
c0297721 | 408 | |
1da177e4 | 409 | return 0; |
5861f1be MB |
410 | |
411 | bad: | |
5861f1be MB |
412 | if (hash_tfm && !IS_ERR(hash_tfm)) |
413 | crypto_free_hash(hash_tfm); | |
b95bf2d3 | 414 | kfree(salt); |
5861f1be | 415 | return err; |
1da177e4 LT |
416 | } |
417 | ||
2dc5327d MB |
418 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, |
419 | struct dm_crypt_request *dmreq) | |
1da177e4 | 420 | { |
fd2d231f | 421 | struct crypto_cipher *essiv_tfm = cc->iv_private; |
c0297721 | 422 | |
1da177e4 | 423 | memset(iv, 0, cc->iv_size); |
283a8328 | 424 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
c0297721 AK |
425 | crypto_cipher_encrypt_one(essiv_tfm, iv, iv); |
426 | ||
1da177e4 LT |
427 | return 0; |
428 | } | |
429 | ||
48527fa7 RS |
430 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
431 | const char *opts) | |
432 | { | |
c0297721 | 433 | unsigned bs = crypto_ablkcipher_blocksize(any_tfm(cc)); |
f0d1b0b3 | 434 | int log = ilog2(bs); |
48527fa7 RS |
435 | |
436 | /* we need to calculate how far we must shift the sector count | |
437 | * to get the cipher block count, we use this shift in _gen */ | |
438 | ||
439 | if (1 << log != bs) { | |
440 | ti->error = "cypher blocksize is not a power of 2"; | |
441 | return -EINVAL; | |
442 | } | |
443 | ||
444 | if (log > 9) { | |
445 | ti->error = "cypher blocksize is > 512"; | |
446 | return -EINVAL; | |
447 | } | |
448 | ||
60473592 | 449 | cc->iv_gen_private.benbi.shift = 9 - log; |
48527fa7 RS |
450 | |
451 | return 0; | |
452 | } | |
453 | ||
454 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) | |
455 | { | |
48527fa7 RS |
456 | } |
457 | ||
2dc5327d MB |
458 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, |
459 | struct dm_crypt_request *dmreq) | |
48527fa7 | 460 | { |
79066ad3 HX |
461 | __be64 val; |
462 | ||
48527fa7 | 463 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
79066ad3 | 464 | |
2dc5327d | 465 | val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); |
79066ad3 | 466 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); |
48527fa7 | 467 | |
1da177e4 LT |
468 | return 0; |
469 | } | |
470 | ||
2dc5327d MB |
471 | static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, |
472 | struct dm_crypt_request *dmreq) | |
46b47730 LN |
473 | { |
474 | memset(iv, 0, cc->iv_size); | |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
34745785 MB |
479 | static void crypt_iv_lmk_dtr(struct crypt_config *cc) |
480 | { | |
481 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
482 | ||
483 | if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) | |
484 | crypto_free_shash(lmk->hash_tfm); | |
485 | lmk->hash_tfm = NULL; | |
486 | ||
487 | kzfree(lmk->seed); | |
488 | lmk->seed = NULL; | |
489 | } | |
490 | ||
491 | static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, | |
492 | const char *opts) | |
493 | { | |
494 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
495 | ||
496 | lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0); | |
497 | if (IS_ERR(lmk->hash_tfm)) { | |
498 | ti->error = "Error initializing LMK hash"; | |
499 | return PTR_ERR(lmk->hash_tfm); | |
500 | } | |
501 | ||
502 | /* No seed in LMK version 2 */ | |
503 | if (cc->key_parts == cc->tfms_count) { | |
504 | lmk->seed = NULL; | |
505 | return 0; | |
506 | } | |
507 | ||
508 | lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); | |
509 | if (!lmk->seed) { | |
510 | crypt_iv_lmk_dtr(cc); | |
511 | ti->error = "Error kmallocing seed storage in LMK"; | |
512 | return -ENOMEM; | |
513 | } | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
518 | static int crypt_iv_lmk_init(struct crypt_config *cc) | |
519 | { | |
520 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
521 | int subkey_size = cc->key_size / cc->key_parts; | |
522 | ||
523 | /* LMK seed is on the position of LMK_KEYS + 1 key */ | |
524 | if (lmk->seed) | |
525 | memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), | |
526 | crypto_shash_digestsize(lmk->hash_tfm)); | |
527 | ||
528 | return 0; | |
529 | } | |
530 | ||
531 | static int crypt_iv_lmk_wipe(struct crypt_config *cc) | |
532 | { | |
533 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
534 | ||
535 | if (lmk->seed) | |
536 | memset(lmk->seed, 0, LMK_SEED_SIZE); | |
537 | ||
538 | return 0; | |
539 | } | |
540 | ||
541 | static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, | |
542 | struct dm_crypt_request *dmreq, | |
543 | u8 *data) | |
544 | { | |
545 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
546 | struct { | |
547 | struct shash_desc desc; | |
548 | char ctx[crypto_shash_descsize(lmk->hash_tfm)]; | |
549 | } sdesc; | |
550 | struct md5_state md5state; | |
da31a078 | 551 | __le32 buf[4]; |
34745785 MB |
552 | int i, r; |
553 | ||
554 | sdesc.desc.tfm = lmk->hash_tfm; | |
555 | sdesc.desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
556 | ||
557 | r = crypto_shash_init(&sdesc.desc); | |
558 | if (r) | |
559 | return r; | |
560 | ||
561 | if (lmk->seed) { | |
562 | r = crypto_shash_update(&sdesc.desc, lmk->seed, LMK_SEED_SIZE); | |
563 | if (r) | |
564 | return r; | |
565 | } | |
566 | ||
567 | /* Sector is always 512B, block size 16, add data of blocks 1-31 */ | |
568 | r = crypto_shash_update(&sdesc.desc, data + 16, 16 * 31); | |
569 | if (r) | |
570 | return r; | |
571 | ||
572 | /* Sector is cropped to 56 bits here */ | |
573 | buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); | |
574 | buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); | |
575 | buf[2] = cpu_to_le32(4024); | |
576 | buf[3] = 0; | |
577 | r = crypto_shash_update(&sdesc.desc, (u8 *)buf, sizeof(buf)); | |
578 | if (r) | |
579 | return r; | |
580 | ||
581 | /* No MD5 padding here */ | |
582 | r = crypto_shash_export(&sdesc.desc, &md5state); | |
583 | if (r) | |
584 | return r; | |
585 | ||
586 | for (i = 0; i < MD5_HASH_WORDS; i++) | |
587 | __cpu_to_le32s(&md5state.hash[i]); | |
588 | memcpy(iv, &md5state.hash, cc->iv_size); | |
589 | ||
590 | return 0; | |
591 | } | |
592 | ||
593 | static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, | |
594 | struct dm_crypt_request *dmreq) | |
595 | { | |
596 | u8 *src; | |
597 | int r = 0; | |
598 | ||
599 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { | |
c2e022cb | 600 | src = kmap_atomic(sg_page(&dmreq->sg_in)); |
34745785 | 601 | r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset); |
c2e022cb | 602 | kunmap_atomic(src); |
34745785 MB |
603 | } else |
604 | memset(iv, 0, cc->iv_size); | |
605 | ||
606 | return r; | |
607 | } | |
608 | ||
609 | static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, | |
610 | struct dm_crypt_request *dmreq) | |
611 | { | |
612 | u8 *dst; | |
613 | int r; | |
614 | ||
615 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) | |
616 | return 0; | |
617 | ||
c2e022cb | 618 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); |
34745785 MB |
619 | r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset); |
620 | ||
621 | /* Tweak the first block of plaintext sector */ | |
622 | if (!r) | |
623 | crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size); | |
624 | ||
c2e022cb | 625 | kunmap_atomic(dst); |
34745785 MB |
626 | return r; |
627 | } | |
628 | ||
ed04d981 MB |
629 | static void crypt_iv_tcw_dtr(struct crypt_config *cc) |
630 | { | |
631 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
632 | ||
633 | kzfree(tcw->iv_seed); | |
634 | tcw->iv_seed = NULL; | |
635 | kzfree(tcw->whitening); | |
636 | tcw->whitening = NULL; | |
637 | ||
638 | if (tcw->crc32_tfm && !IS_ERR(tcw->crc32_tfm)) | |
639 | crypto_free_shash(tcw->crc32_tfm); | |
640 | tcw->crc32_tfm = NULL; | |
641 | } | |
642 | ||
643 | static int crypt_iv_tcw_ctr(struct crypt_config *cc, struct dm_target *ti, | |
644 | const char *opts) | |
645 | { | |
646 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
647 | ||
648 | if (cc->key_size <= (cc->iv_size + TCW_WHITENING_SIZE)) { | |
649 | ti->error = "Wrong key size for TCW"; | |
650 | return -EINVAL; | |
651 | } | |
652 | ||
653 | tcw->crc32_tfm = crypto_alloc_shash("crc32", 0, 0); | |
654 | if (IS_ERR(tcw->crc32_tfm)) { | |
655 | ti->error = "Error initializing CRC32 in TCW"; | |
656 | return PTR_ERR(tcw->crc32_tfm); | |
657 | } | |
658 | ||
659 | tcw->iv_seed = kzalloc(cc->iv_size, GFP_KERNEL); | |
660 | tcw->whitening = kzalloc(TCW_WHITENING_SIZE, GFP_KERNEL); | |
661 | if (!tcw->iv_seed || !tcw->whitening) { | |
662 | crypt_iv_tcw_dtr(cc); | |
663 | ti->error = "Error allocating seed storage in TCW"; | |
664 | return -ENOMEM; | |
665 | } | |
666 | ||
667 | return 0; | |
668 | } | |
669 | ||
670 | static int crypt_iv_tcw_init(struct crypt_config *cc) | |
671 | { | |
672 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
673 | int key_offset = cc->key_size - cc->iv_size - TCW_WHITENING_SIZE; | |
674 | ||
675 | memcpy(tcw->iv_seed, &cc->key[key_offset], cc->iv_size); | |
676 | memcpy(tcw->whitening, &cc->key[key_offset + cc->iv_size], | |
677 | TCW_WHITENING_SIZE); | |
678 | ||
679 | return 0; | |
680 | } | |
681 | ||
682 | static int crypt_iv_tcw_wipe(struct crypt_config *cc) | |
683 | { | |
684 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
685 | ||
686 | memset(tcw->iv_seed, 0, cc->iv_size); | |
687 | memset(tcw->whitening, 0, TCW_WHITENING_SIZE); | |
688 | ||
689 | return 0; | |
690 | } | |
691 | ||
692 | static int crypt_iv_tcw_whitening(struct crypt_config *cc, | |
693 | struct dm_crypt_request *dmreq, | |
694 | u8 *data) | |
695 | { | |
696 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
697 | u64 sector = cpu_to_le64((u64)dmreq->iv_sector); | |
698 | u8 buf[TCW_WHITENING_SIZE]; | |
699 | struct { | |
700 | struct shash_desc desc; | |
701 | char ctx[crypto_shash_descsize(tcw->crc32_tfm)]; | |
702 | } sdesc; | |
703 | int i, r; | |
704 | ||
705 | /* xor whitening with sector number */ | |
706 | memcpy(buf, tcw->whitening, TCW_WHITENING_SIZE); | |
707 | crypto_xor(buf, (u8 *)§or, 8); | |
708 | crypto_xor(&buf[8], (u8 *)§or, 8); | |
709 | ||
710 | /* calculate crc32 for every 32bit part and xor it */ | |
711 | sdesc.desc.tfm = tcw->crc32_tfm; | |
712 | sdesc.desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
713 | for (i = 0; i < 4; i++) { | |
714 | r = crypto_shash_init(&sdesc.desc); | |
715 | if (r) | |
716 | goto out; | |
717 | r = crypto_shash_update(&sdesc.desc, &buf[i * 4], 4); | |
718 | if (r) | |
719 | goto out; | |
720 | r = crypto_shash_final(&sdesc.desc, &buf[i * 4]); | |
721 | if (r) | |
722 | goto out; | |
723 | } | |
724 | crypto_xor(&buf[0], &buf[12], 4); | |
725 | crypto_xor(&buf[4], &buf[8], 4); | |
726 | ||
727 | /* apply whitening (8 bytes) to whole sector */ | |
728 | for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++) | |
729 | crypto_xor(data + i * 8, buf, 8); | |
730 | out: | |
731 | memset(buf, 0, sizeof(buf)); | |
732 | return r; | |
733 | } | |
734 | ||
735 | static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, | |
736 | struct dm_crypt_request *dmreq) | |
737 | { | |
738 | struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; | |
739 | u64 sector = cpu_to_le64((u64)dmreq->iv_sector); | |
740 | u8 *src; | |
741 | int r = 0; | |
742 | ||
743 | /* Remove whitening from ciphertext */ | |
744 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { | |
745 | src = kmap_atomic(sg_page(&dmreq->sg_in)); | |
746 | r = crypt_iv_tcw_whitening(cc, dmreq, src + dmreq->sg_in.offset); | |
747 | kunmap_atomic(src); | |
748 | } | |
749 | ||
750 | /* Calculate IV */ | |
751 | memcpy(iv, tcw->iv_seed, cc->iv_size); | |
752 | crypto_xor(iv, (u8 *)§or, 8); | |
753 | if (cc->iv_size > 8) | |
754 | crypto_xor(&iv[8], (u8 *)§or, cc->iv_size - 8); | |
755 | ||
756 | return r; | |
757 | } | |
758 | ||
759 | static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, | |
760 | struct dm_crypt_request *dmreq) | |
761 | { | |
762 | u8 *dst; | |
763 | int r; | |
764 | ||
765 | if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) | |
766 | return 0; | |
767 | ||
768 | /* Apply whitening on ciphertext */ | |
769 | dst = kmap_atomic(sg_page(&dmreq->sg_out)); | |
770 | r = crypt_iv_tcw_whitening(cc, dmreq, dst + dmreq->sg_out.offset); | |
771 | kunmap_atomic(dst); | |
772 | ||
773 | return r; | |
774 | } | |
775 | ||
1da177e4 LT |
776 | static struct crypt_iv_operations crypt_iv_plain_ops = { |
777 | .generator = crypt_iv_plain_gen | |
778 | }; | |
779 | ||
61afef61 MB |
780 | static struct crypt_iv_operations crypt_iv_plain64_ops = { |
781 | .generator = crypt_iv_plain64_gen | |
782 | }; | |
783 | ||
1da177e4 LT |
784 | static struct crypt_iv_operations crypt_iv_essiv_ops = { |
785 | .ctr = crypt_iv_essiv_ctr, | |
786 | .dtr = crypt_iv_essiv_dtr, | |
b95bf2d3 | 787 | .init = crypt_iv_essiv_init, |
542da317 | 788 | .wipe = crypt_iv_essiv_wipe, |
1da177e4 LT |
789 | .generator = crypt_iv_essiv_gen |
790 | }; | |
791 | ||
48527fa7 RS |
792 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
793 | .ctr = crypt_iv_benbi_ctr, | |
794 | .dtr = crypt_iv_benbi_dtr, | |
795 | .generator = crypt_iv_benbi_gen | |
796 | }; | |
1da177e4 | 797 | |
46b47730 LN |
798 | static struct crypt_iv_operations crypt_iv_null_ops = { |
799 | .generator = crypt_iv_null_gen | |
800 | }; | |
801 | ||
34745785 MB |
802 | static struct crypt_iv_operations crypt_iv_lmk_ops = { |
803 | .ctr = crypt_iv_lmk_ctr, | |
804 | .dtr = crypt_iv_lmk_dtr, | |
805 | .init = crypt_iv_lmk_init, | |
806 | .wipe = crypt_iv_lmk_wipe, | |
807 | .generator = crypt_iv_lmk_gen, | |
808 | .post = crypt_iv_lmk_post | |
809 | }; | |
810 | ||
ed04d981 MB |
811 | static struct crypt_iv_operations crypt_iv_tcw_ops = { |
812 | .ctr = crypt_iv_tcw_ctr, | |
813 | .dtr = crypt_iv_tcw_dtr, | |
814 | .init = crypt_iv_tcw_init, | |
815 | .wipe = crypt_iv_tcw_wipe, | |
816 | .generator = crypt_iv_tcw_gen, | |
817 | .post = crypt_iv_tcw_post | |
818 | }; | |
819 | ||
d469f841 MB |
820 | static void crypt_convert_init(struct crypt_config *cc, |
821 | struct convert_context *ctx, | |
822 | struct bio *bio_out, struct bio *bio_in, | |
fcd369da | 823 | sector_t sector) |
1da177e4 LT |
824 | { |
825 | ctx->bio_in = bio_in; | |
826 | ctx->bio_out = bio_out; | |
003b5c57 KO |
827 | if (bio_in) |
828 | ctx->iter_in = bio_in->bi_iter; | |
829 | if (bio_out) | |
830 | ctx->iter_out = bio_out->bi_iter; | |
c66029f4 | 831 | ctx->cc_sector = sector + cc->iv_offset; |
43d69034 | 832 | init_completion(&ctx->restart); |
1da177e4 LT |
833 | } |
834 | ||
b2174eeb HY |
835 | static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, |
836 | struct ablkcipher_request *req) | |
837 | { | |
838 | return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); | |
839 | } | |
840 | ||
841 | static struct ablkcipher_request *req_of_dmreq(struct crypt_config *cc, | |
842 | struct dm_crypt_request *dmreq) | |
843 | { | |
844 | return (struct ablkcipher_request *)((char *)dmreq - cc->dmreq_start); | |
845 | } | |
846 | ||
2dc5327d MB |
847 | static u8 *iv_of_dmreq(struct crypt_config *cc, |
848 | struct dm_crypt_request *dmreq) | |
849 | { | |
850 | return (u8 *)ALIGN((unsigned long)(dmreq + 1), | |
851 | crypto_ablkcipher_alignmask(any_tfm(cc)) + 1); | |
852 | } | |
853 | ||
01482b76 | 854 | static int crypt_convert_block(struct crypt_config *cc, |
3a7f6c99 MB |
855 | struct convert_context *ctx, |
856 | struct ablkcipher_request *req) | |
01482b76 | 857 | { |
003b5c57 KO |
858 | struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); |
859 | struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); | |
3a7f6c99 MB |
860 | struct dm_crypt_request *dmreq; |
861 | u8 *iv; | |
40b6229b | 862 | int r; |
3a7f6c99 | 863 | |
b2174eeb | 864 | dmreq = dmreq_of_req(cc, req); |
2dc5327d | 865 | iv = iv_of_dmreq(cc, dmreq); |
01482b76 | 866 | |
c66029f4 | 867 | dmreq->iv_sector = ctx->cc_sector; |
b2174eeb | 868 | dmreq->ctx = ctx; |
3a7f6c99 | 869 | sg_init_table(&dmreq->sg_in, 1); |
003b5c57 KO |
870 | sg_set_page(&dmreq->sg_in, bv_in.bv_page, 1 << SECTOR_SHIFT, |
871 | bv_in.bv_offset); | |
01482b76 | 872 | |
3a7f6c99 | 873 | sg_init_table(&dmreq->sg_out, 1); |
003b5c57 KO |
874 | sg_set_page(&dmreq->sg_out, bv_out.bv_page, 1 << SECTOR_SHIFT, |
875 | bv_out.bv_offset); | |
01482b76 | 876 | |
003b5c57 KO |
877 | bio_advance_iter(ctx->bio_in, &ctx->iter_in, 1 << SECTOR_SHIFT); |
878 | bio_advance_iter(ctx->bio_out, &ctx->iter_out, 1 << SECTOR_SHIFT); | |
01482b76 | 879 | |
3a7f6c99 | 880 | if (cc->iv_gen_ops) { |
2dc5327d | 881 | r = cc->iv_gen_ops->generator(cc, iv, dmreq); |
3a7f6c99 MB |
882 | if (r < 0) |
883 | return r; | |
884 | } | |
885 | ||
886 | ablkcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out, | |
887 | 1 << SECTOR_SHIFT, iv); | |
888 | ||
889 | if (bio_data_dir(ctx->bio_in) == WRITE) | |
890 | r = crypto_ablkcipher_encrypt(req); | |
891 | else | |
892 | r = crypto_ablkcipher_decrypt(req); | |
893 | ||
2dc5327d MB |
894 | if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) |
895 | r = cc->iv_gen_ops->post(cc, iv, dmreq); | |
896 | ||
3a7f6c99 | 897 | return r; |
01482b76 MB |
898 | } |
899 | ||
95497a96 MB |
900 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
901 | int error); | |
c0297721 | 902 | |
ddd42edf MB |
903 | static void crypt_alloc_req(struct crypt_config *cc, |
904 | struct convert_context *ctx) | |
905 | { | |
c0297721 | 906 | struct crypt_cpu *this_cc = this_crypt_config(cc); |
c66029f4 | 907 | unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1); |
c0297721 AK |
908 | |
909 | if (!this_cc->req) | |
910 | this_cc->req = mempool_alloc(cc->req_pool, GFP_NOIO); | |
911 | ||
fd2d231f | 912 | ablkcipher_request_set_tfm(this_cc->req, cc->tfms[key_index]); |
c0297721 AK |
913 | ablkcipher_request_set_callback(this_cc->req, |
914 | CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, | |
915 | kcryptd_async_done, dmreq_of_req(cc, this_cc->req)); | |
ddd42edf MB |
916 | } |
917 | ||
1da177e4 LT |
918 | /* |
919 | * Encrypt / decrypt data from one bio to another one (can be the same one) | |
920 | */ | |
921 | static int crypt_convert(struct crypt_config *cc, | |
d469f841 | 922 | struct convert_context *ctx) |
1da177e4 | 923 | { |
c0297721 | 924 | struct crypt_cpu *this_cc = this_crypt_config(cc); |
3f1e9070 | 925 | int r; |
1da177e4 | 926 | |
40b6229b | 927 | atomic_set(&ctx->cc_pending, 1); |
c8081618 | 928 | |
003b5c57 | 929 | while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) { |
1da177e4 | 930 | |
3a7f6c99 MB |
931 | crypt_alloc_req(cc, ctx); |
932 | ||
40b6229b | 933 | atomic_inc(&ctx->cc_pending); |
3f1e9070 | 934 | |
c0297721 | 935 | r = crypt_convert_block(cc, ctx, this_cc->req); |
3a7f6c99 MB |
936 | |
937 | switch (r) { | |
3f1e9070 | 938 | /* async */ |
3a7f6c99 MB |
939 | case -EBUSY: |
940 | wait_for_completion(&ctx->restart); | |
16735d02 | 941 | reinit_completion(&ctx->restart); |
3a7f6c99 MB |
942 | /* fall through*/ |
943 | case -EINPROGRESS: | |
c0297721 | 944 | this_cc->req = NULL; |
c66029f4 | 945 | ctx->cc_sector++; |
3f1e9070 MB |
946 | continue; |
947 | ||
948 | /* sync */ | |
3a7f6c99 | 949 | case 0: |
40b6229b | 950 | atomic_dec(&ctx->cc_pending); |
c66029f4 | 951 | ctx->cc_sector++; |
c7f1b204 | 952 | cond_resched(); |
3a7f6c99 | 953 | continue; |
3a7f6c99 | 954 | |
3f1e9070 MB |
955 | /* error */ |
956 | default: | |
40b6229b | 957 | atomic_dec(&ctx->cc_pending); |
3f1e9070 MB |
958 | return r; |
959 | } | |
1da177e4 LT |
960 | } |
961 | ||
3f1e9070 | 962 | return 0; |
1da177e4 LT |
963 | } |
964 | ||
965 | /* | |
966 | * Generate a new unfragmented bio with the given size | |
967 | * This should never violate the device limitations | |
933f01d4 MB |
968 | * May return a smaller bio when running out of pages, indicated by |
969 | * *out_of_pages set to 1. | |
1da177e4 | 970 | */ |
933f01d4 MB |
971 | static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size, |
972 | unsigned *out_of_pages) | |
1da177e4 | 973 | { |
49a8a920 | 974 | struct crypt_config *cc = io->cc; |
8b004457 | 975 | struct bio *clone; |
1da177e4 | 976 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
b4e3ca1a | 977 | gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM; |
91e10625 MB |
978 | unsigned i, len; |
979 | struct page *page; | |
1da177e4 | 980 | |
2f9941b6 | 981 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
8b004457 | 982 | if (!clone) |
1da177e4 | 983 | return NULL; |
1da177e4 | 984 | |
027581f3 | 985 | clone_init(io, clone); |
933f01d4 | 986 | *out_of_pages = 0; |
6a24c718 | 987 | |
f97380bc | 988 | for (i = 0; i < nr_iovecs; i++) { |
91e10625 | 989 | page = mempool_alloc(cc->page_pool, gfp_mask); |
933f01d4 MB |
990 | if (!page) { |
991 | *out_of_pages = 1; | |
1da177e4 | 992 | break; |
933f01d4 | 993 | } |
1da177e4 LT |
994 | |
995 | /* | |
aeb2deae MP |
996 | * If additional pages cannot be allocated without waiting, |
997 | * return a partially-allocated bio. The caller will then try | |
998 | * to allocate more bios while submitting this partial bio. | |
1da177e4 | 999 | */ |
aeb2deae | 1000 | gfp_mask = (gfp_mask | __GFP_NOWARN) & ~__GFP_WAIT; |
1da177e4 | 1001 | |
91e10625 MB |
1002 | len = (size > PAGE_SIZE) ? PAGE_SIZE : size; |
1003 | ||
1004 | if (!bio_add_page(clone, page, len, 0)) { | |
1005 | mempool_free(page, cc->page_pool); | |
1006 | break; | |
1007 | } | |
1da177e4 | 1008 | |
91e10625 | 1009 | size -= len; |
1da177e4 LT |
1010 | } |
1011 | ||
4f024f37 | 1012 | if (!clone->bi_iter.bi_size) { |
8b004457 | 1013 | bio_put(clone); |
1da177e4 LT |
1014 | return NULL; |
1015 | } | |
1016 | ||
8b004457 | 1017 | return clone; |
1da177e4 LT |
1018 | } |
1019 | ||
644bd2f0 | 1020 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) |
1da177e4 | 1021 | { |
644bd2f0 | 1022 | unsigned int i; |
1da177e4 LT |
1023 | struct bio_vec *bv; |
1024 | ||
cb34e057 | 1025 | bio_for_each_segment_all(bv, clone, i) { |
1da177e4 LT |
1026 | BUG_ON(!bv->bv_page); |
1027 | mempool_free(bv->bv_page, cc->page_pool); | |
1028 | bv->bv_page = NULL; | |
1029 | } | |
1030 | } | |
1031 | ||
49a8a920 | 1032 | static struct dm_crypt_io *crypt_io_alloc(struct crypt_config *cc, |
dc440d1e MB |
1033 | struct bio *bio, sector_t sector) |
1034 | { | |
dc440d1e MB |
1035 | struct dm_crypt_io *io; |
1036 | ||
1037 | io = mempool_alloc(cc->io_pool, GFP_NOIO); | |
49a8a920 | 1038 | io->cc = cc; |
dc440d1e MB |
1039 | io->base_bio = bio; |
1040 | io->sector = sector; | |
1041 | io->error = 0; | |
393b47ef | 1042 | io->base_io = NULL; |
40b6229b | 1043 | atomic_set(&io->io_pending, 0); |
dc440d1e MB |
1044 | |
1045 | return io; | |
1046 | } | |
1047 | ||
3e1a8bdd MB |
1048 | static void crypt_inc_pending(struct dm_crypt_io *io) |
1049 | { | |
40b6229b | 1050 | atomic_inc(&io->io_pending); |
3e1a8bdd MB |
1051 | } |
1052 | ||
1da177e4 LT |
1053 | /* |
1054 | * One of the bios was finished. Check for completion of | |
1055 | * the whole request and correctly clean up the buffer. | |
393b47ef | 1056 | * If base_io is set, wait for the last fragment to complete. |
1da177e4 | 1057 | */ |
5742fd77 | 1058 | static void crypt_dec_pending(struct dm_crypt_io *io) |
1da177e4 | 1059 | { |
49a8a920 | 1060 | struct crypt_config *cc = io->cc; |
b35f8caa MB |
1061 | struct bio *base_bio = io->base_bio; |
1062 | struct dm_crypt_io *base_io = io->base_io; | |
1063 | int error = io->error; | |
1da177e4 | 1064 | |
40b6229b | 1065 | if (!atomic_dec_and_test(&io->io_pending)) |
1da177e4 LT |
1066 | return; |
1067 | ||
b35f8caa MB |
1068 | mempool_free(io, cc->io_pool); |
1069 | ||
1070 | if (likely(!base_io)) | |
1071 | bio_endio(base_bio, error); | |
393b47ef | 1072 | else { |
b35f8caa MB |
1073 | if (error && !base_io->error) |
1074 | base_io->error = error; | |
1075 | crypt_dec_pending(base_io); | |
393b47ef | 1076 | } |
1da177e4 LT |
1077 | } |
1078 | ||
1079 | /* | |
cabf08e4 | 1080 | * kcryptd/kcryptd_io: |
1da177e4 LT |
1081 | * |
1082 | * Needed because it would be very unwise to do decryption in an | |
23541d2d | 1083 | * interrupt context. |
cabf08e4 MB |
1084 | * |
1085 | * kcryptd performs the actual encryption or decryption. | |
1086 | * | |
1087 | * kcryptd_io performs the IO submission. | |
1088 | * | |
1089 | * They must be separated as otherwise the final stages could be | |
1090 | * starved by new requests which can block in the first stages due | |
1091 | * to memory allocation. | |
c0297721 AK |
1092 | * |
1093 | * The work is done per CPU global for all dm-crypt instances. | |
1094 | * They should not depend on each other and do not block. | |
1da177e4 | 1095 | */ |
6712ecf8 | 1096 | static void crypt_endio(struct bio *clone, int error) |
8b004457 | 1097 | { |
028867ac | 1098 | struct dm_crypt_io *io = clone->bi_private; |
49a8a920 | 1099 | struct crypt_config *cc = io->cc; |
ee7a491e | 1100 | unsigned rw = bio_data_dir(clone); |
8b004457 | 1101 | |
adfe4770 MB |
1102 | if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error)) |
1103 | error = -EIO; | |
1104 | ||
8b004457 | 1105 | /* |
6712ecf8 | 1106 | * free the processed pages |
8b004457 | 1107 | */ |
ee7a491e | 1108 | if (rw == WRITE) |
644bd2f0 | 1109 | crypt_free_buffer_pages(cc, clone); |
8b004457 MB |
1110 | |
1111 | bio_put(clone); | |
8b004457 | 1112 | |
ee7a491e MB |
1113 | if (rw == READ && !error) { |
1114 | kcryptd_queue_crypt(io); | |
1115 | return; | |
1116 | } | |
5742fd77 MB |
1117 | |
1118 | if (unlikely(error)) | |
1119 | io->error = error; | |
1120 | ||
1121 | crypt_dec_pending(io); | |
8b004457 MB |
1122 | } |
1123 | ||
028867ac | 1124 | static void clone_init(struct dm_crypt_io *io, struct bio *clone) |
8b004457 | 1125 | { |
49a8a920 | 1126 | struct crypt_config *cc = io->cc; |
8b004457 MB |
1127 | |
1128 | clone->bi_private = io; | |
1129 | clone->bi_end_io = crypt_endio; | |
1130 | clone->bi_bdev = cc->dev->bdev; | |
1131 | clone->bi_rw = io->base_bio->bi_rw; | |
1132 | } | |
1133 | ||
20c82538 | 1134 | static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) |
8b004457 | 1135 | { |
49a8a920 | 1136 | struct crypt_config *cc = io->cc; |
8b004457 MB |
1137 | struct bio *base_bio = io->base_bio; |
1138 | struct bio *clone; | |
93e605c2 | 1139 | |
8b004457 MB |
1140 | /* |
1141 | * The block layer might modify the bvec array, so always | |
1142 | * copy the required bvecs because we need the original | |
1143 | * one in order to decrypt the whole bio data *afterwards*. | |
1144 | */ | |
bf800ef1 | 1145 | clone = bio_clone_bioset(base_bio, gfp, cc->bs); |
7eaceacc | 1146 | if (!clone) |
20c82538 | 1147 | return 1; |
8b004457 | 1148 | |
20c82538 MB |
1149 | crypt_inc_pending(io); |
1150 | ||
8b004457 | 1151 | clone_init(io, clone); |
4f024f37 | 1152 | clone->bi_iter.bi_sector = cc->start + io->sector; |
8b004457 | 1153 | |
93e605c2 | 1154 | generic_make_request(clone); |
20c82538 | 1155 | return 0; |
8b004457 MB |
1156 | } |
1157 | ||
4e4eef64 MB |
1158 | static void kcryptd_io_write(struct dm_crypt_io *io) |
1159 | { | |
95497a96 | 1160 | struct bio *clone = io->ctx.bio_out; |
95497a96 | 1161 | generic_make_request(clone); |
4e4eef64 MB |
1162 | } |
1163 | ||
395b167c AK |
1164 | static void kcryptd_io(struct work_struct *work) |
1165 | { | |
1166 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); | |
1167 | ||
20c82538 MB |
1168 | if (bio_data_dir(io->base_bio) == READ) { |
1169 | crypt_inc_pending(io); | |
1170 | if (kcryptd_io_read(io, GFP_NOIO)) | |
1171 | io->error = -ENOMEM; | |
1172 | crypt_dec_pending(io); | |
1173 | } else | |
395b167c AK |
1174 | kcryptd_io_write(io); |
1175 | } | |
1176 | ||
1177 | static void kcryptd_queue_io(struct dm_crypt_io *io) | |
1178 | { | |
49a8a920 | 1179 | struct crypt_config *cc = io->cc; |
395b167c AK |
1180 | |
1181 | INIT_WORK(&io->work, kcryptd_io); | |
1182 | queue_work(cc->io_queue, &io->work); | |
1183 | } | |
1184 | ||
72c6e7af | 1185 | static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int async) |
4e4eef64 | 1186 | { |
dec1cedf | 1187 | struct bio *clone = io->ctx.bio_out; |
49a8a920 | 1188 | struct crypt_config *cc = io->cc; |
dec1cedf | 1189 | |
72c6e7af | 1190 | if (unlikely(io->error < 0)) { |
dec1cedf MB |
1191 | crypt_free_buffer_pages(cc, clone); |
1192 | bio_put(clone); | |
6c031f41 | 1193 | crypt_dec_pending(io); |
dec1cedf MB |
1194 | return; |
1195 | } | |
1196 | ||
1197 | /* crypt_convert should have filled the clone bio */ | |
003b5c57 | 1198 | BUG_ON(io->ctx.iter_out.bi_size); |
dec1cedf | 1199 | |
4f024f37 | 1200 | clone->bi_iter.bi_sector = cc->start + io->sector; |
899c95d3 | 1201 | |
95497a96 MB |
1202 | if (async) |
1203 | kcryptd_queue_io(io); | |
1e37bb8e | 1204 | else |
95497a96 | 1205 | generic_make_request(clone); |
4e4eef64 MB |
1206 | } |
1207 | ||
fc5a5e9a | 1208 | static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) |
8b004457 | 1209 | { |
49a8a920 | 1210 | struct crypt_config *cc = io->cc; |
8b004457 | 1211 | struct bio *clone; |
393b47ef | 1212 | struct dm_crypt_io *new_io; |
c8081618 | 1213 | int crypt_finished; |
933f01d4 | 1214 | unsigned out_of_pages = 0; |
4f024f37 | 1215 | unsigned remaining = io->base_bio->bi_iter.bi_size; |
b635b00e | 1216 | sector_t sector = io->sector; |
dec1cedf | 1217 | int r; |
8b004457 | 1218 | |
fc5a5e9a MB |
1219 | /* |
1220 | * Prevent io from disappearing until this function completes. | |
1221 | */ | |
1222 | crypt_inc_pending(io); | |
b635b00e | 1223 | crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); |
fc5a5e9a | 1224 | |
93e605c2 MB |
1225 | /* |
1226 | * The allocated buffers can be smaller than the whole bio, | |
1227 | * so repeat the whole process until all the data can be handled. | |
1228 | */ | |
1229 | while (remaining) { | |
933f01d4 | 1230 | clone = crypt_alloc_buffer(io, remaining, &out_of_pages); |
23541d2d | 1231 | if (unlikely(!clone)) { |
5742fd77 | 1232 | io->error = -ENOMEM; |
fc5a5e9a | 1233 | break; |
23541d2d | 1234 | } |
93e605c2 | 1235 | |
53017030 | 1236 | io->ctx.bio_out = clone; |
003b5c57 | 1237 | io->ctx.iter_out = clone->bi_iter; |
93e605c2 | 1238 | |
4f024f37 | 1239 | remaining -= clone->bi_iter.bi_size; |
b635b00e | 1240 | sector += bio_sectors(clone); |
93e605c2 | 1241 | |
4e594098 | 1242 | crypt_inc_pending(io); |
72c6e7af | 1243 | |
dec1cedf | 1244 | r = crypt_convert(cc, &io->ctx); |
72c6e7af MP |
1245 | if (r < 0) |
1246 | io->error = -EIO; | |
1247 | ||
40b6229b | 1248 | crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending); |
f97380bc | 1249 | |
c8081618 MB |
1250 | /* Encryption was already finished, submit io now */ |
1251 | if (crypt_finished) { | |
72c6e7af | 1252 | kcryptd_crypt_write_io_submit(io, 0); |
c8081618 MB |
1253 | |
1254 | /* | |
1255 | * If there was an error, do not try next fragments. | |
1256 | * For async, error is processed in async handler. | |
1257 | */ | |
6c031f41 | 1258 | if (unlikely(r < 0)) |
fc5a5e9a | 1259 | break; |
b635b00e MB |
1260 | |
1261 | io->sector = sector; | |
4e594098 | 1262 | } |
93e605c2 | 1263 | |
933f01d4 MB |
1264 | /* |
1265 | * Out of memory -> run queues | |
1266 | * But don't wait if split was due to the io size restriction | |
1267 | */ | |
1268 | if (unlikely(out_of_pages)) | |
8aa7e847 | 1269 | congestion_wait(BLK_RW_ASYNC, HZ/100); |
933f01d4 | 1270 | |
393b47ef MB |
1271 | /* |
1272 | * With async crypto it is unsafe to share the crypto context | |
1273 | * between fragments, so switch to a new dm_crypt_io structure. | |
1274 | */ | |
1275 | if (unlikely(!crypt_finished && remaining)) { | |
49a8a920 | 1276 | new_io = crypt_io_alloc(io->cc, io->base_bio, |
393b47ef MB |
1277 | sector); |
1278 | crypt_inc_pending(new_io); | |
1279 | crypt_convert_init(cc, &new_io->ctx, NULL, | |
1280 | io->base_bio, sector); | |
003b5c57 | 1281 | new_io->ctx.iter_in = io->ctx.iter_in; |
393b47ef MB |
1282 | |
1283 | /* | |
1284 | * Fragments after the first use the base_io | |
1285 | * pending count. | |
1286 | */ | |
1287 | if (!io->base_io) | |
1288 | new_io->base_io = io; | |
1289 | else { | |
1290 | new_io->base_io = io->base_io; | |
1291 | crypt_inc_pending(io->base_io); | |
1292 | crypt_dec_pending(io); | |
1293 | } | |
1294 | ||
1295 | io = new_io; | |
1296 | } | |
93e605c2 | 1297 | } |
899c95d3 MB |
1298 | |
1299 | crypt_dec_pending(io); | |
84131db6 MB |
1300 | } |
1301 | ||
72c6e7af | 1302 | static void kcryptd_crypt_read_done(struct dm_crypt_io *io) |
5742fd77 | 1303 | { |
5742fd77 MB |
1304 | crypt_dec_pending(io); |
1305 | } | |
1306 | ||
4e4eef64 | 1307 | static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) |
8b004457 | 1308 | { |
49a8a920 | 1309 | struct crypt_config *cc = io->cc; |
5742fd77 | 1310 | int r = 0; |
1da177e4 | 1311 | |
3e1a8bdd | 1312 | crypt_inc_pending(io); |
3a7f6c99 | 1313 | |
53017030 | 1314 | crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, |
0c395b0f | 1315 | io->sector); |
1da177e4 | 1316 | |
5742fd77 | 1317 | r = crypt_convert(cc, &io->ctx); |
72c6e7af MP |
1318 | if (r < 0) |
1319 | io->error = -EIO; | |
5742fd77 | 1320 | |
40b6229b | 1321 | if (atomic_dec_and_test(&io->ctx.cc_pending)) |
72c6e7af | 1322 | kcryptd_crypt_read_done(io); |
3a7f6c99 MB |
1323 | |
1324 | crypt_dec_pending(io); | |
1da177e4 LT |
1325 | } |
1326 | ||
95497a96 MB |
1327 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
1328 | int error) | |
1329 | { | |
b2174eeb HY |
1330 | struct dm_crypt_request *dmreq = async_req->data; |
1331 | struct convert_context *ctx = dmreq->ctx; | |
95497a96 | 1332 | struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); |
49a8a920 | 1333 | struct crypt_config *cc = io->cc; |
95497a96 MB |
1334 | |
1335 | if (error == -EINPROGRESS) { | |
1336 | complete(&ctx->restart); | |
1337 | return; | |
1338 | } | |
1339 | ||
2dc5327d MB |
1340 | if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) |
1341 | error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq); | |
1342 | ||
72c6e7af MP |
1343 | if (error < 0) |
1344 | io->error = -EIO; | |
1345 | ||
b2174eeb | 1346 | mempool_free(req_of_dmreq(cc, dmreq), cc->req_pool); |
95497a96 | 1347 | |
40b6229b | 1348 | if (!atomic_dec_and_test(&ctx->cc_pending)) |
95497a96 MB |
1349 | return; |
1350 | ||
1351 | if (bio_data_dir(io->base_bio) == READ) | |
72c6e7af | 1352 | kcryptd_crypt_read_done(io); |
95497a96 | 1353 | else |
72c6e7af | 1354 | kcryptd_crypt_write_io_submit(io, 1); |
95497a96 MB |
1355 | } |
1356 | ||
395b167c | 1357 | static void kcryptd_crypt(struct work_struct *work) |
1da177e4 | 1358 | { |
028867ac | 1359 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
8b004457 | 1360 | |
cabf08e4 | 1361 | if (bio_data_dir(io->base_bio) == READ) |
395b167c | 1362 | kcryptd_crypt_read_convert(io); |
4e4eef64 | 1363 | else |
395b167c | 1364 | kcryptd_crypt_write_convert(io); |
cabf08e4 MB |
1365 | } |
1366 | ||
395b167c | 1367 | static void kcryptd_queue_crypt(struct dm_crypt_io *io) |
cabf08e4 | 1368 | { |
49a8a920 | 1369 | struct crypt_config *cc = io->cc; |
cabf08e4 | 1370 | |
395b167c AK |
1371 | INIT_WORK(&io->work, kcryptd_crypt); |
1372 | queue_work(cc->crypt_queue, &io->work); | |
1da177e4 LT |
1373 | } |
1374 | ||
1375 | /* | |
1376 | * Decode key from its hex representation | |
1377 | */ | |
1378 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) | |
1379 | { | |
1380 | char buffer[3]; | |
1da177e4 LT |
1381 | unsigned int i; |
1382 | ||
1383 | buffer[2] = '\0'; | |
1384 | ||
8b004457 | 1385 | for (i = 0; i < size; i++) { |
1da177e4 LT |
1386 | buffer[0] = *hex++; |
1387 | buffer[1] = *hex++; | |
1388 | ||
1a66a08a | 1389 | if (kstrtou8(buffer, 16, &key[i])) |
1da177e4 LT |
1390 | return -EINVAL; |
1391 | } | |
1392 | ||
1393 | if (*hex != '\0') | |
1394 | return -EINVAL; | |
1395 | ||
1396 | return 0; | |
1397 | } | |
1398 | ||
fd2d231f | 1399 | static void crypt_free_tfms(struct crypt_config *cc) |
d1f96423 | 1400 | { |
d1f96423 MB |
1401 | unsigned i; |
1402 | ||
fd2d231f MP |
1403 | if (!cc->tfms) |
1404 | return; | |
1405 | ||
d1f96423 | 1406 | for (i = 0; i < cc->tfms_count; i++) |
fd2d231f MP |
1407 | if (cc->tfms[i] && !IS_ERR(cc->tfms[i])) { |
1408 | crypto_free_ablkcipher(cc->tfms[i]); | |
1409 | cc->tfms[i] = NULL; | |
d1f96423 | 1410 | } |
fd2d231f MP |
1411 | |
1412 | kfree(cc->tfms); | |
1413 | cc->tfms = NULL; | |
d1f96423 MB |
1414 | } |
1415 | ||
fd2d231f | 1416 | static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) |
d1f96423 | 1417 | { |
d1f96423 MB |
1418 | unsigned i; |
1419 | int err; | |
1420 | ||
fd2d231f MP |
1421 | cc->tfms = kmalloc(cc->tfms_count * sizeof(struct crypto_ablkcipher *), |
1422 | GFP_KERNEL); | |
1423 | if (!cc->tfms) | |
1424 | return -ENOMEM; | |
1425 | ||
d1f96423 | 1426 | for (i = 0; i < cc->tfms_count; i++) { |
fd2d231f MP |
1427 | cc->tfms[i] = crypto_alloc_ablkcipher(ciphermode, 0, 0); |
1428 | if (IS_ERR(cc->tfms[i])) { | |
1429 | err = PTR_ERR(cc->tfms[i]); | |
1430 | crypt_free_tfms(cc); | |
d1f96423 MB |
1431 | return err; |
1432 | } | |
1433 | } | |
1434 | ||
1435 | return 0; | |
1436 | } | |
1437 | ||
c0297721 AK |
1438 | static int crypt_setkey_allcpus(struct crypt_config *cc) |
1439 | { | |
da31a078 | 1440 | unsigned subkey_size; |
fd2d231f MP |
1441 | int err = 0, i, r; |
1442 | ||
da31a078 MB |
1443 | /* Ignore extra keys (which are used for IV etc) */ |
1444 | subkey_size = (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); | |
1445 | ||
fd2d231f MP |
1446 | for (i = 0; i < cc->tfms_count; i++) { |
1447 | r = crypto_ablkcipher_setkey(cc->tfms[i], | |
1448 | cc->key + (i * subkey_size), | |
1449 | subkey_size); | |
1450 | if (r) | |
1451 | err = r; | |
c0297721 AK |
1452 | } |
1453 | ||
1454 | return err; | |
1455 | } | |
1456 | ||
e48d4bbf MB |
1457 | static int crypt_set_key(struct crypt_config *cc, char *key) |
1458 | { | |
de8be5ac MB |
1459 | int r = -EINVAL; |
1460 | int key_string_len = strlen(key); | |
1461 | ||
69a8cfcd | 1462 | /* The key size may not be changed. */ |
de8be5ac MB |
1463 | if (cc->key_size != (key_string_len >> 1)) |
1464 | goto out; | |
e48d4bbf | 1465 | |
69a8cfcd MB |
1466 | /* Hyphen (which gives a key_size of zero) means there is no key. */ |
1467 | if (!cc->key_size && strcmp(key, "-")) | |
de8be5ac | 1468 | goto out; |
e48d4bbf | 1469 | |
69a8cfcd | 1470 | if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0) |
de8be5ac | 1471 | goto out; |
e48d4bbf MB |
1472 | |
1473 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1474 | ||
de8be5ac MB |
1475 | r = crypt_setkey_allcpus(cc); |
1476 | ||
1477 | out: | |
1478 | /* Hex key string not needed after here, so wipe it. */ | |
1479 | memset(key, '0', key_string_len); | |
1480 | ||
1481 | return r; | |
e48d4bbf MB |
1482 | } |
1483 | ||
1484 | static int crypt_wipe_key(struct crypt_config *cc) | |
1485 | { | |
1486 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1487 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); | |
c0297721 AK |
1488 | |
1489 | return crypt_setkey_allcpus(cc); | |
e48d4bbf MB |
1490 | } |
1491 | ||
28513fcc MB |
1492 | static void crypt_dtr(struct dm_target *ti) |
1493 | { | |
1494 | struct crypt_config *cc = ti->private; | |
c0297721 AK |
1495 | struct crypt_cpu *cpu_cc; |
1496 | int cpu; | |
28513fcc MB |
1497 | |
1498 | ti->private = NULL; | |
1499 | ||
1500 | if (!cc) | |
1501 | return; | |
1502 | ||
1503 | if (cc->io_queue) | |
1504 | destroy_workqueue(cc->io_queue); | |
1505 | if (cc->crypt_queue) | |
1506 | destroy_workqueue(cc->crypt_queue); | |
1507 | ||
c0297721 AK |
1508 | if (cc->cpu) |
1509 | for_each_possible_cpu(cpu) { | |
1510 | cpu_cc = per_cpu_ptr(cc->cpu, cpu); | |
1511 | if (cpu_cc->req) | |
1512 | mempool_free(cpu_cc->req, cc->req_pool); | |
c0297721 AK |
1513 | } |
1514 | ||
fd2d231f MP |
1515 | crypt_free_tfms(cc); |
1516 | ||
28513fcc MB |
1517 | if (cc->bs) |
1518 | bioset_free(cc->bs); | |
1519 | ||
1520 | if (cc->page_pool) | |
1521 | mempool_destroy(cc->page_pool); | |
1522 | if (cc->req_pool) | |
1523 | mempool_destroy(cc->req_pool); | |
1524 | if (cc->io_pool) | |
1525 | mempool_destroy(cc->io_pool); | |
1526 | ||
1527 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) | |
1528 | cc->iv_gen_ops->dtr(cc); | |
1529 | ||
28513fcc MB |
1530 | if (cc->dev) |
1531 | dm_put_device(ti, cc->dev); | |
1532 | ||
c0297721 AK |
1533 | if (cc->cpu) |
1534 | free_percpu(cc->cpu); | |
1535 | ||
5ebaee6d | 1536 | kzfree(cc->cipher); |
7dbcd137 | 1537 | kzfree(cc->cipher_string); |
28513fcc MB |
1538 | |
1539 | /* Must zero key material before freeing */ | |
1540 | kzfree(cc); | |
1541 | } | |
1542 | ||
5ebaee6d MB |
1543 | static int crypt_ctr_cipher(struct dm_target *ti, |
1544 | char *cipher_in, char *key) | |
1da177e4 | 1545 | { |
5ebaee6d | 1546 | struct crypt_config *cc = ti->private; |
d1f96423 | 1547 | char *tmp, *cipher, *chainmode, *ivmode, *ivopts, *keycount; |
5ebaee6d | 1548 | char *cipher_api = NULL; |
fd2d231f | 1549 | int ret = -EINVAL; |
31998ef1 | 1550 | char dummy; |
1da177e4 | 1551 | |
5ebaee6d MB |
1552 | /* Convert to crypto api definition? */ |
1553 | if (strchr(cipher_in, '(')) { | |
1554 | ti->error = "Bad cipher specification"; | |
1da177e4 LT |
1555 | return -EINVAL; |
1556 | } | |
1557 | ||
7dbcd137 MB |
1558 | cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); |
1559 | if (!cc->cipher_string) | |
1560 | goto bad_mem; | |
1561 | ||
5ebaee6d MB |
1562 | /* |
1563 | * Legacy dm-crypt cipher specification | |
d1f96423 | 1564 | * cipher[:keycount]-mode-iv:ivopts |
5ebaee6d MB |
1565 | */ |
1566 | tmp = cipher_in; | |
d1f96423 MB |
1567 | keycount = strsep(&tmp, "-"); |
1568 | cipher = strsep(&keycount, ":"); | |
1569 | ||
1570 | if (!keycount) | |
1571 | cc->tfms_count = 1; | |
31998ef1 | 1572 | else if (sscanf(keycount, "%u%c", &cc->tfms_count, &dummy) != 1 || |
d1f96423 MB |
1573 | !is_power_of_2(cc->tfms_count)) { |
1574 | ti->error = "Bad cipher key count specification"; | |
1575 | return -EINVAL; | |
1576 | } | |
1577 | cc->key_parts = cc->tfms_count; | |
da31a078 | 1578 | cc->key_extra_size = 0; |
5ebaee6d MB |
1579 | |
1580 | cc->cipher = kstrdup(cipher, GFP_KERNEL); | |
1581 | if (!cc->cipher) | |
1582 | goto bad_mem; | |
1583 | ||
1da177e4 LT |
1584 | chainmode = strsep(&tmp, "-"); |
1585 | ivopts = strsep(&tmp, "-"); | |
1586 | ivmode = strsep(&ivopts, ":"); | |
1587 | ||
1588 | if (tmp) | |
5ebaee6d | 1589 | DMWARN("Ignoring unexpected additional cipher options"); |
1da177e4 | 1590 | |
fd2d231f | 1591 | cc->cpu = __alloc_percpu(sizeof(*(cc->cpu)), |
d1f96423 | 1592 | __alignof__(struct crypt_cpu)); |
c0297721 AK |
1593 | if (!cc->cpu) { |
1594 | ti->error = "Cannot allocate per cpu state"; | |
1595 | goto bad_mem; | |
1596 | } | |
1597 | ||
7dbcd137 MB |
1598 | /* |
1599 | * For compatibility with the original dm-crypt mapping format, if | |
1600 | * only the cipher name is supplied, use cbc-plain. | |
1601 | */ | |
5ebaee6d | 1602 | if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) { |
1da177e4 LT |
1603 | chainmode = "cbc"; |
1604 | ivmode = "plain"; | |
1605 | } | |
1606 | ||
d1806f6a | 1607 | if (strcmp(chainmode, "ecb") && !ivmode) { |
5ebaee6d MB |
1608 | ti->error = "IV mechanism required"; |
1609 | return -EINVAL; | |
1da177e4 LT |
1610 | } |
1611 | ||
5ebaee6d MB |
1612 | cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); |
1613 | if (!cipher_api) | |
1614 | goto bad_mem; | |
1615 | ||
1616 | ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, | |
1617 | "%s(%s)", chainmode, cipher); | |
1618 | if (ret < 0) { | |
1619 | kfree(cipher_api); | |
1620 | goto bad_mem; | |
1da177e4 LT |
1621 | } |
1622 | ||
5ebaee6d | 1623 | /* Allocate cipher */ |
fd2d231f MP |
1624 | ret = crypt_alloc_tfms(cc, cipher_api); |
1625 | if (ret < 0) { | |
1626 | ti->error = "Error allocating crypto tfm"; | |
1627 | goto bad; | |
1da177e4 | 1628 | } |
1da177e4 | 1629 | |
5ebaee6d | 1630 | /* Initialize IV */ |
c0297721 | 1631 | cc->iv_size = crypto_ablkcipher_ivsize(any_tfm(cc)); |
5ebaee6d MB |
1632 | if (cc->iv_size) |
1633 | /* at least a 64 bit sector number should fit in our buffer */ | |
1634 | cc->iv_size = max(cc->iv_size, | |
1635 | (unsigned int)(sizeof(u64) / sizeof(u8))); | |
1636 | else if (ivmode) { | |
1637 | DMWARN("Selected cipher does not support IVs"); | |
1638 | ivmode = NULL; | |
1639 | } | |
1640 | ||
1641 | /* Choose ivmode, see comments at iv code. */ | |
1da177e4 LT |
1642 | if (ivmode == NULL) |
1643 | cc->iv_gen_ops = NULL; | |
1644 | else if (strcmp(ivmode, "plain") == 0) | |
1645 | cc->iv_gen_ops = &crypt_iv_plain_ops; | |
61afef61 MB |
1646 | else if (strcmp(ivmode, "plain64") == 0) |
1647 | cc->iv_gen_ops = &crypt_iv_plain64_ops; | |
1da177e4 LT |
1648 | else if (strcmp(ivmode, "essiv") == 0) |
1649 | cc->iv_gen_ops = &crypt_iv_essiv_ops; | |
48527fa7 RS |
1650 | else if (strcmp(ivmode, "benbi") == 0) |
1651 | cc->iv_gen_ops = &crypt_iv_benbi_ops; | |
46b47730 LN |
1652 | else if (strcmp(ivmode, "null") == 0) |
1653 | cc->iv_gen_ops = &crypt_iv_null_ops; | |
34745785 MB |
1654 | else if (strcmp(ivmode, "lmk") == 0) { |
1655 | cc->iv_gen_ops = &crypt_iv_lmk_ops; | |
ed04d981 MB |
1656 | /* |
1657 | * Version 2 and 3 is recognised according | |
34745785 MB |
1658 | * to length of provided multi-key string. |
1659 | * If present (version 3), last key is used as IV seed. | |
ed04d981 | 1660 | * All keys (including IV seed) are always the same size. |
34745785 | 1661 | */ |
da31a078 | 1662 | if (cc->key_size % cc->key_parts) { |
34745785 | 1663 | cc->key_parts++; |
da31a078 MB |
1664 | cc->key_extra_size = cc->key_size / cc->key_parts; |
1665 | } | |
ed04d981 MB |
1666 | } else if (strcmp(ivmode, "tcw") == 0) { |
1667 | cc->iv_gen_ops = &crypt_iv_tcw_ops; | |
1668 | cc->key_parts += 2; /* IV + whitening */ | |
1669 | cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; | |
34745785 | 1670 | } else { |
5ebaee6d | 1671 | ret = -EINVAL; |
72d94861 | 1672 | ti->error = "Invalid IV mode"; |
28513fcc | 1673 | goto bad; |
1da177e4 LT |
1674 | } |
1675 | ||
da31a078 MB |
1676 | /* Initialize and set key */ |
1677 | ret = crypt_set_key(cc, key); | |
1678 | if (ret < 0) { | |
1679 | ti->error = "Error decoding and setting key"; | |
1680 | goto bad; | |
1681 | } | |
1682 | ||
28513fcc MB |
1683 | /* Allocate IV */ |
1684 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { | |
1685 | ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); | |
1686 | if (ret < 0) { | |
1687 | ti->error = "Error creating IV"; | |
1688 | goto bad; | |
1689 | } | |
1690 | } | |
1da177e4 | 1691 | |
28513fcc MB |
1692 | /* Initialize IV (set keys for ESSIV etc) */ |
1693 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) { | |
1694 | ret = cc->iv_gen_ops->init(cc); | |
1695 | if (ret < 0) { | |
1696 | ti->error = "Error initialising IV"; | |
1697 | goto bad; | |
1698 | } | |
b95bf2d3 MB |
1699 | } |
1700 | ||
5ebaee6d MB |
1701 | ret = 0; |
1702 | bad: | |
1703 | kfree(cipher_api); | |
1704 | return ret; | |
1705 | ||
1706 | bad_mem: | |
1707 | ti->error = "Cannot allocate cipher strings"; | |
1708 | return -ENOMEM; | |
1709 | } | |
1710 | ||
1711 | /* | |
1712 | * Construct an encryption mapping: | |
1713 | * <cipher> <key> <iv_offset> <dev_path> <start> | |
1714 | */ | |
1715 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
1716 | { | |
1717 | struct crypt_config *cc; | |
772ae5f5 | 1718 | unsigned int key_size, opt_params; |
5ebaee6d MB |
1719 | unsigned long long tmpll; |
1720 | int ret; | |
772ae5f5 MB |
1721 | struct dm_arg_set as; |
1722 | const char *opt_string; | |
31998ef1 | 1723 | char dummy; |
772ae5f5 MB |
1724 | |
1725 | static struct dm_arg _args[] = { | |
1726 | {0, 1, "Invalid number of feature args"}, | |
1727 | }; | |
5ebaee6d | 1728 | |
772ae5f5 | 1729 | if (argc < 5) { |
5ebaee6d MB |
1730 | ti->error = "Not enough arguments"; |
1731 | return -EINVAL; | |
1da177e4 LT |
1732 | } |
1733 | ||
5ebaee6d MB |
1734 | key_size = strlen(argv[1]) >> 1; |
1735 | ||
1736 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); | |
1737 | if (!cc) { | |
1738 | ti->error = "Cannot allocate encryption context"; | |
1739 | return -ENOMEM; | |
1740 | } | |
69a8cfcd | 1741 | cc->key_size = key_size; |
5ebaee6d MB |
1742 | |
1743 | ti->private = cc; | |
1744 | ret = crypt_ctr_cipher(ti, argv[0], argv[1]); | |
1745 | if (ret < 0) | |
1746 | goto bad; | |
1747 | ||
28513fcc | 1748 | ret = -ENOMEM; |
93d2341c | 1749 | cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool); |
1da177e4 | 1750 | if (!cc->io_pool) { |
72d94861 | 1751 | ti->error = "Cannot allocate crypt io mempool"; |
28513fcc | 1752 | goto bad; |
1da177e4 LT |
1753 | } |
1754 | ||
ddd42edf | 1755 | cc->dmreq_start = sizeof(struct ablkcipher_request); |
c0297721 | 1756 | cc->dmreq_start += crypto_ablkcipher_reqsize(any_tfm(cc)); |
ddd42edf | 1757 | cc->dmreq_start = ALIGN(cc->dmreq_start, crypto_tfm_ctx_alignment()); |
c0297721 | 1758 | cc->dmreq_start += crypto_ablkcipher_alignmask(any_tfm(cc)) & |
3a7f6c99 | 1759 | ~(crypto_tfm_ctx_alignment() - 1); |
ddd42edf MB |
1760 | |
1761 | cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + | |
1762 | sizeof(struct dm_crypt_request) + cc->iv_size); | |
1763 | if (!cc->req_pool) { | |
1764 | ti->error = "Cannot allocate crypt request mempool"; | |
28513fcc | 1765 | goto bad; |
ddd42edf | 1766 | } |
ddd42edf | 1767 | |
a19b27ce | 1768 | cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0); |
1da177e4 | 1769 | if (!cc->page_pool) { |
72d94861 | 1770 | ti->error = "Cannot allocate page mempool"; |
28513fcc | 1771 | goto bad; |
1da177e4 LT |
1772 | } |
1773 | ||
bb799ca0 | 1774 | cc->bs = bioset_create(MIN_IOS, 0); |
6a24c718 MB |
1775 | if (!cc->bs) { |
1776 | ti->error = "Cannot allocate crypt bioset"; | |
28513fcc | 1777 | goto bad; |
6a24c718 MB |
1778 | } |
1779 | ||
28513fcc | 1780 | ret = -EINVAL; |
31998ef1 | 1781 | if (sscanf(argv[2], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1782 | ti->error = "Invalid iv_offset sector"; |
28513fcc | 1783 | goto bad; |
1da177e4 | 1784 | } |
4ee218cd | 1785 | cc->iv_offset = tmpll; |
1da177e4 | 1786 | |
28513fcc MB |
1787 | if (dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev)) { |
1788 | ti->error = "Device lookup failed"; | |
1789 | goto bad; | |
1790 | } | |
1791 | ||
31998ef1 | 1792 | if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) { |
72d94861 | 1793 | ti->error = "Invalid device sector"; |
28513fcc | 1794 | goto bad; |
1da177e4 | 1795 | } |
4ee218cd | 1796 | cc->start = tmpll; |
1da177e4 | 1797 | |
772ae5f5 MB |
1798 | argv += 5; |
1799 | argc -= 5; | |
1800 | ||
1801 | /* Optional parameters */ | |
1802 | if (argc) { | |
1803 | as.argc = argc; | |
1804 | as.argv = argv; | |
1805 | ||
1806 | ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); | |
1807 | if (ret) | |
1808 | goto bad; | |
1809 | ||
1810 | opt_string = dm_shift_arg(&as); | |
1811 | ||
1812 | if (opt_params == 1 && opt_string && | |
1813 | !strcasecmp(opt_string, "allow_discards")) | |
55a62eef | 1814 | ti->num_discard_bios = 1; |
772ae5f5 MB |
1815 | else if (opt_params) { |
1816 | ret = -EINVAL; | |
1817 | ti->error = "Invalid feature arguments"; | |
1818 | goto bad; | |
1819 | } | |
1820 | } | |
1821 | ||
28513fcc | 1822 | ret = -ENOMEM; |
670368a8 | 1823 | cc->io_queue = alloc_workqueue("kcryptd_io", WQ_MEM_RECLAIM, 1); |
cabf08e4 MB |
1824 | if (!cc->io_queue) { |
1825 | ti->error = "Couldn't create kcryptd io queue"; | |
28513fcc | 1826 | goto bad; |
cabf08e4 MB |
1827 | } |
1828 | ||
c0297721 | 1829 | cc->crypt_queue = alloc_workqueue("kcryptd", |
670368a8 | 1830 | WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1); |
cabf08e4 | 1831 | if (!cc->crypt_queue) { |
9934a8be | 1832 | ti->error = "Couldn't create kcryptd queue"; |
28513fcc | 1833 | goto bad; |
9934a8be MB |
1834 | } |
1835 | ||
55a62eef | 1836 | ti->num_flush_bios = 1; |
0ac55489 | 1837 | ti->discard_zeroes_data_unsupported = true; |
983c7db3 | 1838 | |
1da177e4 LT |
1839 | return 0; |
1840 | ||
28513fcc MB |
1841 | bad: |
1842 | crypt_dtr(ti); | |
1843 | return ret; | |
1da177e4 LT |
1844 | } |
1845 | ||
7de3ee57 | 1846 | static int crypt_map(struct dm_target *ti, struct bio *bio) |
1da177e4 | 1847 | { |
028867ac | 1848 | struct dm_crypt_io *io; |
49a8a920 | 1849 | struct crypt_config *cc = ti->private; |
647c7db1 | 1850 | |
772ae5f5 MB |
1851 | /* |
1852 | * If bio is REQ_FLUSH or REQ_DISCARD, just bypass crypt queues. | |
1853 | * - for REQ_FLUSH device-mapper core ensures that no IO is in-flight | |
1854 | * - for REQ_DISCARD caller must use flush if IO ordering matters | |
1855 | */ | |
1856 | if (unlikely(bio->bi_rw & (REQ_FLUSH | REQ_DISCARD))) { | |
647c7db1 | 1857 | bio->bi_bdev = cc->dev->bdev; |
772ae5f5 | 1858 | if (bio_sectors(bio)) |
4f024f37 KO |
1859 | bio->bi_iter.bi_sector = cc->start + |
1860 | dm_target_offset(ti, bio->bi_iter.bi_sector); | |
647c7db1 MP |
1861 | return DM_MAPIO_REMAPPED; |
1862 | } | |
1da177e4 | 1863 | |
4f024f37 | 1864 | io = crypt_io_alloc(cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector)); |
cabf08e4 | 1865 | |
20c82538 MB |
1866 | if (bio_data_dir(io->base_bio) == READ) { |
1867 | if (kcryptd_io_read(io, GFP_NOWAIT)) | |
1868 | kcryptd_queue_io(io); | |
1869 | } else | |
cabf08e4 | 1870 | kcryptd_queue_crypt(io); |
1da177e4 | 1871 | |
d2a7ad29 | 1872 | return DM_MAPIO_SUBMITTED; |
1da177e4 LT |
1873 | } |
1874 | ||
fd7c092e MP |
1875 | static void crypt_status(struct dm_target *ti, status_type_t type, |
1876 | unsigned status_flags, char *result, unsigned maxlen) | |
1da177e4 | 1877 | { |
5ebaee6d | 1878 | struct crypt_config *cc = ti->private; |
fd7c092e | 1879 | unsigned i, sz = 0; |
1da177e4 LT |
1880 | |
1881 | switch (type) { | |
1882 | case STATUSTYPE_INFO: | |
1883 | result[0] = '\0'; | |
1884 | break; | |
1885 | ||
1886 | case STATUSTYPE_TABLE: | |
7dbcd137 | 1887 | DMEMIT("%s ", cc->cipher_string); |
1da177e4 | 1888 | |
fd7c092e MP |
1889 | if (cc->key_size > 0) |
1890 | for (i = 0; i < cc->key_size; i++) | |
1891 | DMEMIT("%02x", cc->key[i]); | |
1892 | else | |
1893 | DMEMIT("-"); | |
1da177e4 | 1894 | |
4ee218cd AM |
1895 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
1896 | cc->dev->name, (unsigned long long)cc->start); | |
772ae5f5 | 1897 | |
55a62eef | 1898 | if (ti->num_discard_bios) |
772ae5f5 MB |
1899 | DMEMIT(" 1 allow_discards"); |
1900 | ||
1da177e4 LT |
1901 | break; |
1902 | } | |
1da177e4 LT |
1903 | } |
1904 | ||
e48d4bbf MB |
1905 | static void crypt_postsuspend(struct dm_target *ti) |
1906 | { | |
1907 | struct crypt_config *cc = ti->private; | |
1908 | ||
1909 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1910 | } | |
1911 | ||
1912 | static int crypt_preresume(struct dm_target *ti) | |
1913 | { | |
1914 | struct crypt_config *cc = ti->private; | |
1915 | ||
1916 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { | |
1917 | DMERR("aborting resume - crypt key is not set."); | |
1918 | return -EAGAIN; | |
1919 | } | |
1920 | ||
1921 | return 0; | |
1922 | } | |
1923 | ||
1924 | static void crypt_resume(struct dm_target *ti) | |
1925 | { | |
1926 | struct crypt_config *cc = ti->private; | |
1927 | ||
1928 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1929 | } | |
1930 | ||
1931 | /* Message interface | |
1932 | * key set <key> | |
1933 | * key wipe | |
1934 | */ | |
1935 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) | |
1936 | { | |
1937 | struct crypt_config *cc = ti->private; | |
542da317 | 1938 | int ret = -EINVAL; |
e48d4bbf MB |
1939 | |
1940 | if (argc < 2) | |
1941 | goto error; | |
1942 | ||
498f0103 | 1943 | if (!strcasecmp(argv[0], "key")) { |
e48d4bbf MB |
1944 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { |
1945 | DMWARN("not suspended during key manipulation."); | |
1946 | return -EINVAL; | |
1947 | } | |
498f0103 | 1948 | if (argc == 3 && !strcasecmp(argv[1], "set")) { |
542da317 MB |
1949 | ret = crypt_set_key(cc, argv[2]); |
1950 | if (ret) | |
1951 | return ret; | |
1952 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) | |
1953 | ret = cc->iv_gen_ops->init(cc); | |
1954 | return ret; | |
1955 | } | |
498f0103 | 1956 | if (argc == 2 && !strcasecmp(argv[1], "wipe")) { |
542da317 MB |
1957 | if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { |
1958 | ret = cc->iv_gen_ops->wipe(cc); | |
1959 | if (ret) | |
1960 | return ret; | |
1961 | } | |
e48d4bbf | 1962 | return crypt_wipe_key(cc); |
542da317 | 1963 | } |
e48d4bbf MB |
1964 | } |
1965 | ||
1966 | error: | |
1967 | DMWARN("unrecognised message received."); | |
1968 | return -EINVAL; | |
1969 | } | |
1970 | ||
d41e26b9 MB |
1971 | static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm, |
1972 | struct bio_vec *biovec, int max_size) | |
1973 | { | |
1974 | struct crypt_config *cc = ti->private; | |
1975 | struct request_queue *q = bdev_get_queue(cc->dev->bdev); | |
1976 | ||
1977 | if (!q->merge_bvec_fn) | |
1978 | return max_size; | |
1979 | ||
1980 | bvm->bi_bdev = cc->dev->bdev; | |
b441a262 | 1981 | bvm->bi_sector = cc->start + dm_target_offset(ti, bvm->bi_sector); |
d41e26b9 MB |
1982 | |
1983 | return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); | |
1984 | } | |
1985 | ||
af4874e0 MS |
1986 | static int crypt_iterate_devices(struct dm_target *ti, |
1987 | iterate_devices_callout_fn fn, void *data) | |
1988 | { | |
1989 | struct crypt_config *cc = ti->private; | |
1990 | ||
5dea271b | 1991 | return fn(ti, cc->dev, cc->start, ti->len, data); |
af4874e0 MS |
1992 | } |
1993 | ||
1da177e4 LT |
1994 | static struct target_type crypt_target = { |
1995 | .name = "crypt", | |
ed04d981 | 1996 | .version = {1, 13, 0}, |
1da177e4 LT |
1997 | .module = THIS_MODULE, |
1998 | .ctr = crypt_ctr, | |
1999 | .dtr = crypt_dtr, | |
2000 | .map = crypt_map, | |
2001 | .status = crypt_status, | |
e48d4bbf MB |
2002 | .postsuspend = crypt_postsuspend, |
2003 | .preresume = crypt_preresume, | |
2004 | .resume = crypt_resume, | |
2005 | .message = crypt_message, | |
d41e26b9 | 2006 | .merge = crypt_merge, |
af4874e0 | 2007 | .iterate_devices = crypt_iterate_devices, |
1da177e4 LT |
2008 | }; |
2009 | ||
2010 | static int __init dm_crypt_init(void) | |
2011 | { | |
2012 | int r; | |
2013 | ||
028867ac | 2014 | _crypt_io_pool = KMEM_CACHE(dm_crypt_io, 0); |
1da177e4 LT |
2015 | if (!_crypt_io_pool) |
2016 | return -ENOMEM; | |
2017 | ||
1da177e4 LT |
2018 | r = dm_register_target(&crypt_target); |
2019 | if (r < 0) { | |
72d94861 | 2020 | DMERR("register failed %d", r); |
9934a8be | 2021 | kmem_cache_destroy(_crypt_io_pool); |
1da177e4 LT |
2022 | } |
2023 | ||
1da177e4 LT |
2024 | return r; |
2025 | } | |
2026 | ||
2027 | static void __exit dm_crypt_exit(void) | |
2028 | { | |
10d3bd09 | 2029 | dm_unregister_target(&crypt_target); |
1da177e4 LT |
2030 | kmem_cache_destroy(_crypt_io_pool); |
2031 | } | |
2032 | ||
2033 | module_init(dm_crypt_init); | |
2034 | module_exit(dm_crypt_exit); | |
2035 | ||
2036 | MODULE_AUTHOR("Christophe Saout <christophe@saout.de>"); | |
2037 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); | |
2038 | MODULE_LICENSE("GPL"); |