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. |
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> |
1da177e4 | 22 | #include <asm/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" |
e48d4bbf | 33 | #define MESG_STR(x) x, sizeof(x) |
1da177e4 | 34 | |
1da177e4 LT |
35 | /* |
36 | * context holding the current state of a multi-part conversion | |
37 | */ | |
38 | struct convert_context { | |
43d69034 | 39 | struct completion restart; |
1da177e4 LT |
40 | struct bio *bio_in; |
41 | struct bio *bio_out; | |
42 | unsigned int offset_in; | |
43 | unsigned int offset_out; | |
44 | unsigned int idx_in; | |
45 | unsigned int idx_out; | |
46 | sector_t sector; | |
43d69034 | 47 | atomic_t pending; |
1da177e4 LT |
48 | }; |
49 | ||
53017030 MB |
50 | /* |
51 | * per bio private data | |
52 | */ | |
53 | struct dm_crypt_io { | |
54 | struct dm_target *target; | |
55 | struct bio *base_bio; | |
56 | struct work_struct work; | |
57 | ||
58 | struct convert_context ctx; | |
59 | ||
60 | atomic_t pending; | |
61 | int error; | |
0c395b0f | 62 | sector_t sector; |
393b47ef | 63 | struct dm_crypt_io *base_io; |
53017030 MB |
64 | }; |
65 | ||
01482b76 | 66 | struct dm_crypt_request { |
b2174eeb | 67 | struct convert_context *ctx; |
01482b76 MB |
68 | struct scatterlist sg_in; |
69 | struct scatterlist sg_out; | |
2dc5327d | 70 | sector_t iv_sector; |
01482b76 MB |
71 | }; |
72 | ||
1da177e4 LT |
73 | struct crypt_config; |
74 | ||
75 | struct crypt_iv_operations { | |
76 | int (*ctr)(struct crypt_config *cc, struct dm_target *ti, | |
d469f841 | 77 | const char *opts); |
1da177e4 | 78 | void (*dtr)(struct crypt_config *cc); |
b95bf2d3 | 79 | int (*init)(struct crypt_config *cc); |
542da317 | 80 | int (*wipe)(struct crypt_config *cc); |
2dc5327d MB |
81 | int (*generator)(struct crypt_config *cc, u8 *iv, |
82 | struct dm_crypt_request *dmreq); | |
83 | int (*post)(struct crypt_config *cc, u8 *iv, | |
84 | struct dm_crypt_request *dmreq); | |
1da177e4 LT |
85 | }; |
86 | ||
60473592 | 87 | struct iv_essiv_private { |
b95bf2d3 MB |
88 | struct crypto_hash *hash_tfm; |
89 | u8 *salt; | |
60473592 MB |
90 | }; |
91 | ||
92 | struct iv_benbi_private { | |
93 | int shift; | |
94 | }; | |
95 | ||
34745785 MB |
96 | #define LMK_SEED_SIZE 64 /* hash + 0 */ |
97 | struct iv_lmk_private { | |
98 | struct crypto_shash *hash_tfm; | |
99 | u8 *seed; | |
100 | }; | |
101 | ||
1da177e4 LT |
102 | /* |
103 | * Crypt: maps a linear range of a block device | |
104 | * and encrypts / decrypts at the same time. | |
105 | */ | |
e48d4bbf | 106 | enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID }; |
c0297721 AK |
107 | |
108 | /* | |
109 | * Duplicated per-CPU state for cipher. | |
110 | */ | |
111 | struct crypt_cpu { | |
112 | struct ablkcipher_request *req; | |
c0297721 AK |
113 | /* ESSIV: struct crypto_cipher *essiv_tfm */ |
114 | void *iv_private; | |
d1f96423 | 115 | struct crypto_ablkcipher *tfms[0]; |
c0297721 AK |
116 | }; |
117 | ||
118 | /* | |
119 | * The fields in here must be read only after initialization, | |
120 | * changing state should be in crypt_cpu. | |
121 | */ | |
1da177e4 LT |
122 | struct crypt_config { |
123 | struct dm_dev *dev; | |
124 | sector_t start; | |
125 | ||
126 | /* | |
ddd42edf MB |
127 | * pool for per bio private data, crypto requests and |
128 | * encryption requeusts/buffer pages | |
1da177e4 LT |
129 | */ |
130 | mempool_t *io_pool; | |
ddd42edf | 131 | mempool_t *req_pool; |
1da177e4 | 132 | mempool_t *page_pool; |
6a24c718 | 133 | struct bio_set *bs; |
1da177e4 | 134 | |
cabf08e4 MB |
135 | struct workqueue_struct *io_queue; |
136 | struct workqueue_struct *crypt_queue; | |
3f1e9070 | 137 | |
5ebaee6d | 138 | char *cipher; |
7dbcd137 | 139 | char *cipher_string; |
5ebaee6d | 140 | |
1da177e4 | 141 | struct crypt_iv_operations *iv_gen_ops; |
79066ad3 | 142 | union { |
60473592 MB |
143 | struct iv_essiv_private essiv; |
144 | struct iv_benbi_private benbi; | |
34745785 | 145 | struct iv_lmk_private lmk; |
79066ad3 | 146 | } iv_gen_private; |
1da177e4 LT |
147 | sector_t iv_offset; |
148 | unsigned int iv_size; | |
149 | ||
c0297721 AK |
150 | /* |
151 | * Duplicated per cpu state. Access through | |
152 | * per_cpu_ptr() only. | |
153 | */ | |
154 | struct crypt_cpu __percpu *cpu; | |
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 LT |
179 | #define MIN_POOL_PAGES 32 |
180 | #define MIN_BIO_PAGES 8 | |
181 | ||
e18b890b | 182 | static struct kmem_cache *_crypt_io_pool; |
1da177e4 | 183 | |
028867ac | 184 | static void clone_init(struct dm_crypt_io *, struct bio *); |
395b167c | 185 | static void kcryptd_queue_crypt(struct dm_crypt_io *io); |
2dc5327d | 186 | static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq); |
027581f3 | 187 | |
c0297721 AK |
188 | static struct crypt_cpu *this_crypt_config(struct crypt_config *cc) |
189 | { | |
190 | return this_cpu_ptr(cc->cpu); | |
191 | } | |
192 | ||
193 | /* | |
194 | * Use this to access cipher attributes that are the same for each CPU. | |
195 | */ | |
196 | static struct crypto_ablkcipher *any_tfm(struct crypt_config *cc) | |
197 | { | |
d1f96423 | 198 | return __this_cpu_ptr(cc->cpu)->tfms[0]; |
c0297721 AK |
199 | } |
200 | ||
1da177e4 LT |
201 | /* |
202 | * Different IV generation algorithms: | |
203 | * | |
3c164bd8 | 204 | * plain: the initial vector is the 32-bit little-endian version of the sector |
3a4fa0a2 | 205 | * number, padded with zeros if necessary. |
1da177e4 | 206 | * |
61afef61 MB |
207 | * plain64: the initial vector is the 64-bit little-endian version of the sector |
208 | * number, padded with zeros if necessary. | |
209 | * | |
3c164bd8 RS |
210 | * essiv: "encrypted sector|salt initial vector", the sector number is |
211 | * encrypted with the bulk cipher using a salt as key. The salt | |
212 | * should be derived from the bulk cipher's key via hashing. | |
1da177e4 | 213 | * |
48527fa7 RS |
214 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
215 | * (needed for LRW-32-AES and possible other narrow block modes) | |
216 | * | |
46b47730 LN |
217 | * null: the initial vector is always zero. Provides compatibility with |
218 | * obsolete loop_fish2 devices. Do not use for new devices. | |
219 | * | |
34745785 MB |
220 | * lmk: Compatible implementation of the block chaining mode used |
221 | * by the Loop-AES block device encryption system | |
222 | * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ | |
223 | * It operates on full 512 byte sectors and uses CBC | |
224 | * with an IV derived from the sector number, the data and | |
225 | * optionally extra IV seed. | |
226 | * This means that after decryption the first block | |
227 | * of sector must be tweaked according to decrypted data. | |
228 | * Loop-AES can use three encryption schemes: | |
229 | * version 1: is plain aes-cbc mode | |
230 | * version 2: uses 64 multikey scheme with lmk IV generator | |
231 | * version 3: the same as version 2 with additional IV seed | |
232 | * (it uses 65 keys, last key is used as IV seed) | |
233 | * | |
1da177e4 LT |
234 | * plumb: unimplemented, see: |
235 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 | |
236 | */ | |
237 | ||
2dc5327d MB |
238 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, |
239 | struct dm_crypt_request *dmreq) | |
1da177e4 LT |
240 | { |
241 | memset(iv, 0, cc->iv_size); | |
2dc5327d | 242 | *(u32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); |
1da177e4 LT |
243 | |
244 | return 0; | |
245 | } | |
246 | ||
61afef61 | 247 | static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, |
2dc5327d | 248 | struct dm_crypt_request *dmreq) |
61afef61 MB |
249 | { |
250 | memset(iv, 0, cc->iv_size); | |
2dc5327d | 251 | *(u64 *)iv = cpu_to_le64(dmreq->iv_sector); |
61afef61 MB |
252 | |
253 | return 0; | |
254 | } | |
255 | ||
b95bf2d3 MB |
256 | /* Initialise ESSIV - compute salt but no local memory allocations */ |
257 | static int crypt_iv_essiv_init(struct crypt_config *cc) | |
258 | { | |
259 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
260 | struct hash_desc desc; | |
261 | struct scatterlist sg; | |
c0297721 AK |
262 | struct crypto_cipher *essiv_tfm; |
263 | int err, cpu; | |
b95bf2d3 MB |
264 | |
265 | sg_init_one(&sg, cc->key, cc->key_size); | |
266 | desc.tfm = essiv->hash_tfm; | |
267 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
268 | ||
269 | err = crypto_hash_digest(&desc, &sg, cc->key_size, essiv->salt); | |
270 | if (err) | |
271 | return err; | |
272 | ||
c0297721 AK |
273 | for_each_possible_cpu(cpu) { |
274 | essiv_tfm = per_cpu_ptr(cc->cpu, cpu)->iv_private, | |
275 | ||
276 | err = crypto_cipher_setkey(essiv_tfm, essiv->salt, | |
b95bf2d3 | 277 | crypto_hash_digestsize(essiv->hash_tfm)); |
c0297721 AK |
278 | if (err) |
279 | return err; | |
280 | } | |
281 | ||
282 | return 0; | |
b95bf2d3 MB |
283 | } |
284 | ||
542da317 MB |
285 | /* Wipe salt and reset key derived from volume key */ |
286 | static int crypt_iv_essiv_wipe(struct crypt_config *cc) | |
287 | { | |
288 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
289 | unsigned salt_size = crypto_hash_digestsize(essiv->hash_tfm); | |
c0297721 AK |
290 | struct crypto_cipher *essiv_tfm; |
291 | int cpu, r, err = 0; | |
542da317 MB |
292 | |
293 | memset(essiv->salt, 0, salt_size); | |
294 | ||
c0297721 AK |
295 | for_each_possible_cpu(cpu) { |
296 | essiv_tfm = per_cpu_ptr(cc->cpu, cpu)->iv_private; | |
297 | r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size); | |
298 | if (r) | |
299 | err = r; | |
300 | } | |
301 | ||
302 | return err; | |
303 | } | |
304 | ||
305 | /* Set up per cpu cipher state */ | |
306 | static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc, | |
307 | struct dm_target *ti, | |
308 | u8 *salt, unsigned saltsize) | |
309 | { | |
310 | struct crypto_cipher *essiv_tfm; | |
311 | int err; | |
312 | ||
313 | /* Setup the essiv_tfm with the given salt */ | |
314 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); | |
315 | if (IS_ERR(essiv_tfm)) { | |
316 | ti->error = "Error allocating crypto tfm for ESSIV"; | |
317 | return essiv_tfm; | |
318 | } | |
319 | ||
320 | if (crypto_cipher_blocksize(essiv_tfm) != | |
321 | crypto_ablkcipher_ivsize(any_tfm(cc))) { | |
322 | ti->error = "Block size of ESSIV cipher does " | |
323 | "not match IV size of block cipher"; | |
324 | crypto_free_cipher(essiv_tfm); | |
325 | return ERR_PTR(-EINVAL); | |
326 | } | |
327 | ||
328 | err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); | |
329 | if (err) { | |
330 | ti->error = "Failed to set key for ESSIV cipher"; | |
331 | crypto_free_cipher(essiv_tfm); | |
332 | return ERR_PTR(err); | |
333 | } | |
334 | ||
335 | return essiv_tfm; | |
542da317 MB |
336 | } |
337 | ||
60473592 MB |
338 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) |
339 | { | |
c0297721 AK |
340 | int cpu; |
341 | struct crypt_cpu *cpu_cc; | |
342 | struct crypto_cipher *essiv_tfm; | |
60473592 MB |
343 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; |
344 | ||
b95bf2d3 MB |
345 | crypto_free_hash(essiv->hash_tfm); |
346 | essiv->hash_tfm = NULL; | |
347 | ||
348 | kzfree(essiv->salt); | |
349 | essiv->salt = NULL; | |
c0297721 AK |
350 | |
351 | for_each_possible_cpu(cpu) { | |
352 | cpu_cc = per_cpu_ptr(cc->cpu, cpu); | |
353 | essiv_tfm = cpu_cc->iv_private; | |
354 | ||
355 | if (essiv_tfm) | |
356 | crypto_free_cipher(essiv_tfm); | |
357 | ||
358 | cpu_cc->iv_private = NULL; | |
359 | } | |
60473592 MB |
360 | } |
361 | ||
1da177e4 | 362 | static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, |
d469f841 | 363 | const char *opts) |
1da177e4 | 364 | { |
5861f1be MB |
365 | struct crypto_cipher *essiv_tfm = NULL; |
366 | struct crypto_hash *hash_tfm = NULL; | |
5861f1be | 367 | u8 *salt = NULL; |
c0297721 | 368 | int err, cpu; |
1da177e4 | 369 | |
5861f1be | 370 | if (!opts) { |
72d94861 | 371 | ti->error = "Digest algorithm missing for ESSIV mode"; |
1da177e4 LT |
372 | return -EINVAL; |
373 | } | |
374 | ||
b95bf2d3 | 375 | /* Allocate hash algorithm */ |
35058687 HX |
376 | hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC); |
377 | if (IS_ERR(hash_tfm)) { | |
72d94861 | 378 | ti->error = "Error initializing ESSIV hash"; |
5861f1be MB |
379 | err = PTR_ERR(hash_tfm); |
380 | goto bad; | |
1da177e4 LT |
381 | } |
382 | ||
b95bf2d3 | 383 | salt = kzalloc(crypto_hash_digestsize(hash_tfm), GFP_KERNEL); |
5861f1be | 384 | if (!salt) { |
72d94861 | 385 | ti->error = "Error kmallocing salt storage in ESSIV"; |
5861f1be MB |
386 | err = -ENOMEM; |
387 | goto bad; | |
1da177e4 LT |
388 | } |
389 | ||
b95bf2d3 | 390 | cc->iv_gen_private.essiv.salt = salt; |
b95bf2d3 MB |
391 | cc->iv_gen_private.essiv.hash_tfm = hash_tfm; |
392 | ||
c0297721 AK |
393 | for_each_possible_cpu(cpu) { |
394 | essiv_tfm = setup_essiv_cpu(cc, ti, salt, | |
395 | crypto_hash_digestsize(hash_tfm)); | |
396 | if (IS_ERR(essiv_tfm)) { | |
397 | crypt_iv_essiv_dtr(cc); | |
398 | return PTR_ERR(essiv_tfm); | |
399 | } | |
400 | per_cpu_ptr(cc->cpu, cpu)->iv_private = essiv_tfm; | |
401 | } | |
402 | ||
1da177e4 | 403 | return 0; |
5861f1be MB |
404 | |
405 | bad: | |
5861f1be MB |
406 | if (hash_tfm && !IS_ERR(hash_tfm)) |
407 | crypto_free_hash(hash_tfm); | |
b95bf2d3 | 408 | kfree(salt); |
5861f1be | 409 | return err; |
1da177e4 LT |
410 | } |
411 | ||
2dc5327d MB |
412 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, |
413 | struct dm_crypt_request *dmreq) | |
1da177e4 | 414 | { |
c0297721 AK |
415 | struct crypto_cipher *essiv_tfm = this_crypt_config(cc)->iv_private; |
416 | ||
1da177e4 | 417 | memset(iv, 0, cc->iv_size); |
2dc5327d | 418 | *(u64 *)iv = cpu_to_le64(dmreq->iv_sector); |
c0297721 AK |
419 | crypto_cipher_encrypt_one(essiv_tfm, iv, iv); |
420 | ||
1da177e4 LT |
421 | return 0; |
422 | } | |
423 | ||
48527fa7 RS |
424 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
425 | const char *opts) | |
426 | { | |
c0297721 | 427 | unsigned bs = crypto_ablkcipher_blocksize(any_tfm(cc)); |
f0d1b0b3 | 428 | int log = ilog2(bs); |
48527fa7 RS |
429 | |
430 | /* we need to calculate how far we must shift the sector count | |
431 | * to get the cipher block count, we use this shift in _gen */ | |
432 | ||
433 | if (1 << log != bs) { | |
434 | ti->error = "cypher blocksize is not a power of 2"; | |
435 | return -EINVAL; | |
436 | } | |
437 | ||
438 | if (log > 9) { | |
439 | ti->error = "cypher blocksize is > 512"; | |
440 | return -EINVAL; | |
441 | } | |
442 | ||
60473592 | 443 | cc->iv_gen_private.benbi.shift = 9 - log; |
48527fa7 RS |
444 | |
445 | return 0; | |
446 | } | |
447 | ||
448 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) | |
449 | { | |
48527fa7 RS |
450 | } |
451 | ||
2dc5327d MB |
452 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, |
453 | struct dm_crypt_request *dmreq) | |
48527fa7 | 454 | { |
79066ad3 HX |
455 | __be64 val; |
456 | ||
48527fa7 | 457 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
79066ad3 | 458 | |
2dc5327d | 459 | val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); |
79066ad3 | 460 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); |
48527fa7 | 461 | |
1da177e4 LT |
462 | return 0; |
463 | } | |
464 | ||
2dc5327d MB |
465 | static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, |
466 | struct dm_crypt_request *dmreq) | |
46b47730 LN |
467 | { |
468 | memset(iv, 0, cc->iv_size); | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
34745785 MB |
473 | static void crypt_iv_lmk_dtr(struct crypt_config *cc) |
474 | { | |
475 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
476 | ||
477 | if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) | |
478 | crypto_free_shash(lmk->hash_tfm); | |
479 | lmk->hash_tfm = NULL; | |
480 | ||
481 | kzfree(lmk->seed); | |
482 | lmk->seed = NULL; | |
483 | } | |
484 | ||
485 | static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, | |
486 | const char *opts) | |
487 | { | |
488 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
489 | ||
490 | lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0); | |
491 | if (IS_ERR(lmk->hash_tfm)) { | |
492 | ti->error = "Error initializing LMK hash"; | |
493 | return PTR_ERR(lmk->hash_tfm); | |
494 | } | |
495 | ||
496 | /* No seed in LMK version 2 */ | |
497 | if (cc->key_parts == cc->tfms_count) { | |
498 | lmk->seed = NULL; | |
499 | return 0; | |
500 | } | |
501 | ||
502 | lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); | |
503 | if (!lmk->seed) { | |
504 | crypt_iv_lmk_dtr(cc); | |
505 | ti->error = "Error kmallocing seed storage in LMK"; | |
506 | return -ENOMEM; | |
507 | } | |
508 | ||
509 | return 0; | |
510 | } | |
511 | ||
512 | static int crypt_iv_lmk_init(struct crypt_config *cc) | |
513 | { | |
514 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
515 | int subkey_size = cc->key_size / cc->key_parts; | |
516 | ||
517 | /* LMK seed is on the position of LMK_KEYS + 1 key */ | |
518 | if (lmk->seed) | |
519 | memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), | |
520 | crypto_shash_digestsize(lmk->hash_tfm)); | |
521 | ||
522 | return 0; | |
523 | } | |
524 | ||
525 | static int crypt_iv_lmk_wipe(struct crypt_config *cc) | |
526 | { | |
527 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
528 | ||
529 | if (lmk->seed) | |
530 | memset(lmk->seed, 0, LMK_SEED_SIZE); | |
531 | ||
532 | return 0; | |
533 | } | |
534 | ||
535 | static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, | |
536 | struct dm_crypt_request *dmreq, | |
537 | u8 *data) | |
538 | { | |
539 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
540 | struct { | |
541 | struct shash_desc desc; | |
542 | char ctx[crypto_shash_descsize(lmk->hash_tfm)]; | |
543 | } sdesc; | |
544 | struct md5_state md5state; | |
545 | u32 buf[4]; | |
546 | int i, r; | |
547 | ||
548 | sdesc.desc.tfm = lmk->hash_tfm; | |
549 | sdesc.desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
550 | ||
551 | r = crypto_shash_init(&sdesc.desc); | |
552 | if (r) | |
553 | return r; | |
554 | ||
555 | if (lmk->seed) { | |
556 | r = crypto_shash_update(&sdesc.desc, lmk->seed, LMK_SEED_SIZE); | |
557 | if (r) | |
558 | return r; | |
559 | } | |
560 | ||
561 | /* Sector is always 512B, block size 16, add data of blocks 1-31 */ | |
562 | r = crypto_shash_update(&sdesc.desc, data + 16, 16 * 31); | |
563 | if (r) | |
564 | return r; | |
565 | ||
566 | /* Sector is cropped to 56 bits here */ | |
567 | buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); | |
568 | buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); | |
569 | buf[2] = cpu_to_le32(4024); | |
570 | buf[3] = 0; | |
571 | r = crypto_shash_update(&sdesc.desc, (u8 *)buf, sizeof(buf)); | |
572 | if (r) | |
573 | return r; | |
574 | ||
575 | /* No MD5 padding here */ | |
576 | r = crypto_shash_export(&sdesc.desc, &md5state); | |
577 | if (r) | |
578 | return r; | |
579 | ||
580 | for (i = 0; i < MD5_HASH_WORDS; i++) | |
581 | __cpu_to_le32s(&md5state.hash[i]); | |
582 | memcpy(iv, &md5state.hash, cc->iv_size); | |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
587 | static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, | |
588 | struct dm_crypt_request *dmreq) | |
589 | { | |
590 | u8 *src; | |
591 | int r = 0; | |
592 | ||
593 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { | |
594 | src = kmap_atomic(sg_page(&dmreq->sg_in), KM_USER0); | |
595 | r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset); | |
596 | kunmap_atomic(src, KM_USER0); | |
597 | } else | |
598 | memset(iv, 0, cc->iv_size); | |
599 | ||
600 | return r; | |
601 | } | |
602 | ||
603 | static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, | |
604 | struct dm_crypt_request *dmreq) | |
605 | { | |
606 | u8 *dst; | |
607 | int r; | |
608 | ||
609 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) | |
610 | return 0; | |
611 | ||
612 | dst = kmap_atomic(sg_page(&dmreq->sg_out), KM_USER0); | |
613 | r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset); | |
614 | ||
615 | /* Tweak the first block of plaintext sector */ | |
616 | if (!r) | |
617 | crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size); | |
618 | ||
619 | kunmap_atomic(dst, KM_USER0); | |
620 | return r; | |
621 | } | |
622 | ||
1da177e4 LT |
623 | static struct crypt_iv_operations crypt_iv_plain_ops = { |
624 | .generator = crypt_iv_plain_gen | |
625 | }; | |
626 | ||
61afef61 MB |
627 | static struct crypt_iv_operations crypt_iv_plain64_ops = { |
628 | .generator = crypt_iv_plain64_gen | |
629 | }; | |
630 | ||
1da177e4 LT |
631 | static struct crypt_iv_operations crypt_iv_essiv_ops = { |
632 | .ctr = crypt_iv_essiv_ctr, | |
633 | .dtr = crypt_iv_essiv_dtr, | |
b95bf2d3 | 634 | .init = crypt_iv_essiv_init, |
542da317 | 635 | .wipe = crypt_iv_essiv_wipe, |
1da177e4 LT |
636 | .generator = crypt_iv_essiv_gen |
637 | }; | |
638 | ||
48527fa7 RS |
639 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
640 | .ctr = crypt_iv_benbi_ctr, | |
641 | .dtr = crypt_iv_benbi_dtr, | |
642 | .generator = crypt_iv_benbi_gen | |
643 | }; | |
1da177e4 | 644 | |
46b47730 LN |
645 | static struct crypt_iv_operations crypt_iv_null_ops = { |
646 | .generator = crypt_iv_null_gen | |
647 | }; | |
648 | ||
34745785 MB |
649 | static struct crypt_iv_operations crypt_iv_lmk_ops = { |
650 | .ctr = crypt_iv_lmk_ctr, | |
651 | .dtr = crypt_iv_lmk_dtr, | |
652 | .init = crypt_iv_lmk_init, | |
653 | .wipe = crypt_iv_lmk_wipe, | |
654 | .generator = crypt_iv_lmk_gen, | |
655 | .post = crypt_iv_lmk_post | |
656 | }; | |
657 | ||
d469f841 MB |
658 | static void crypt_convert_init(struct crypt_config *cc, |
659 | struct convert_context *ctx, | |
660 | struct bio *bio_out, struct bio *bio_in, | |
fcd369da | 661 | sector_t sector) |
1da177e4 LT |
662 | { |
663 | ctx->bio_in = bio_in; | |
664 | ctx->bio_out = bio_out; | |
665 | ctx->offset_in = 0; | |
666 | ctx->offset_out = 0; | |
667 | ctx->idx_in = bio_in ? bio_in->bi_idx : 0; | |
668 | ctx->idx_out = bio_out ? bio_out->bi_idx : 0; | |
669 | ctx->sector = sector + cc->iv_offset; | |
43d69034 | 670 | init_completion(&ctx->restart); |
1da177e4 LT |
671 | } |
672 | ||
b2174eeb HY |
673 | static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, |
674 | struct ablkcipher_request *req) | |
675 | { | |
676 | return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); | |
677 | } | |
678 | ||
679 | static struct ablkcipher_request *req_of_dmreq(struct crypt_config *cc, | |
680 | struct dm_crypt_request *dmreq) | |
681 | { | |
682 | return (struct ablkcipher_request *)((char *)dmreq - cc->dmreq_start); | |
683 | } | |
684 | ||
2dc5327d MB |
685 | static u8 *iv_of_dmreq(struct crypt_config *cc, |
686 | struct dm_crypt_request *dmreq) | |
687 | { | |
688 | return (u8 *)ALIGN((unsigned long)(dmreq + 1), | |
689 | crypto_ablkcipher_alignmask(any_tfm(cc)) + 1); | |
690 | } | |
691 | ||
01482b76 | 692 | static int crypt_convert_block(struct crypt_config *cc, |
3a7f6c99 MB |
693 | struct convert_context *ctx, |
694 | struct ablkcipher_request *req) | |
01482b76 MB |
695 | { |
696 | struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in); | |
697 | struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out); | |
3a7f6c99 MB |
698 | struct dm_crypt_request *dmreq; |
699 | u8 *iv; | |
700 | int r = 0; | |
701 | ||
b2174eeb | 702 | dmreq = dmreq_of_req(cc, req); |
2dc5327d | 703 | iv = iv_of_dmreq(cc, dmreq); |
01482b76 | 704 | |
2dc5327d | 705 | dmreq->iv_sector = ctx->sector; |
b2174eeb | 706 | dmreq->ctx = ctx; |
3a7f6c99 MB |
707 | sg_init_table(&dmreq->sg_in, 1); |
708 | sg_set_page(&dmreq->sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT, | |
01482b76 MB |
709 | bv_in->bv_offset + ctx->offset_in); |
710 | ||
3a7f6c99 MB |
711 | sg_init_table(&dmreq->sg_out, 1); |
712 | sg_set_page(&dmreq->sg_out, bv_out->bv_page, 1 << SECTOR_SHIFT, | |
01482b76 MB |
713 | bv_out->bv_offset + ctx->offset_out); |
714 | ||
715 | ctx->offset_in += 1 << SECTOR_SHIFT; | |
716 | if (ctx->offset_in >= bv_in->bv_len) { | |
717 | ctx->offset_in = 0; | |
718 | ctx->idx_in++; | |
719 | } | |
720 | ||
721 | ctx->offset_out += 1 << SECTOR_SHIFT; | |
722 | if (ctx->offset_out >= bv_out->bv_len) { | |
723 | ctx->offset_out = 0; | |
724 | ctx->idx_out++; | |
725 | } | |
726 | ||
3a7f6c99 | 727 | if (cc->iv_gen_ops) { |
2dc5327d | 728 | r = cc->iv_gen_ops->generator(cc, iv, dmreq); |
3a7f6c99 MB |
729 | if (r < 0) |
730 | return r; | |
731 | } | |
732 | ||
733 | ablkcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out, | |
734 | 1 << SECTOR_SHIFT, iv); | |
735 | ||
736 | if (bio_data_dir(ctx->bio_in) == WRITE) | |
737 | r = crypto_ablkcipher_encrypt(req); | |
738 | else | |
739 | r = crypto_ablkcipher_decrypt(req); | |
740 | ||
2dc5327d MB |
741 | if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) |
742 | r = cc->iv_gen_ops->post(cc, iv, dmreq); | |
743 | ||
3a7f6c99 | 744 | return r; |
01482b76 MB |
745 | } |
746 | ||
95497a96 MB |
747 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
748 | int error); | |
c0297721 | 749 | |
ddd42edf MB |
750 | static void crypt_alloc_req(struct crypt_config *cc, |
751 | struct convert_context *ctx) | |
752 | { | |
c0297721 | 753 | struct crypt_cpu *this_cc = this_crypt_config(cc); |
d1f96423 | 754 | unsigned key_index = ctx->sector & (cc->tfms_count - 1); |
c0297721 AK |
755 | |
756 | if (!this_cc->req) | |
757 | this_cc->req = mempool_alloc(cc->req_pool, GFP_NOIO); | |
758 | ||
d1f96423 | 759 | ablkcipher_request_set_tfm(this_cc->req, this_cc->tfms[key_index]); |
c0297721 AK |
760 | ablkcipher_request_set_callback(this_cc->req, |
761 | CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, | |
762 | kcryptd_async_done, dmreq_of_req(cc, this_cc->req)); | |
ddd42edf MB |
763 | } |
764 | ||
1da177e4 LT |
765 | /* |
766 | * Encrypt / decrypt data from one bio to another one (can be the same one) | |
767 | */ | |
768 | static int crypt_convert(struct crypt_config *cc, | |
d469f841 | 769 | struct convert_context *ctx) |
1da177e4 | 770 | { |
c0297721 | 771 | struct crypt_cpu *this_cc = this_crypt_config(cc); |
3f1e9070 | 772 | int r; |
1da177e4 | 773 | |
c8081618 MB |
774 | atomic_set(&ctx->pending, 1); |
775 | ||
1da177e4 LT |
776 | while(ctx->idx_in < ctx->bio_in->bi_vcnt && |
777 | ctx->idx_out < ctx->bio_out->bi_vcnt) { | |
1da177e4 | 778 | |
3a7f6c99 MB |
779 | crypt_alloc_req(cc, ctx); |
780 | ||
3f1e9070 MB |
781 | atomic_inc(&ctx->pending); |
782 | ||
c0297721 | 783 | r = crypt_convert_block(cc, ctx, this_cc->req); |
3a7f6c99 MB |
784 | |
785 | switch (r) { | |
3f1e9070 | 786 | /* async */ |
3a7f6c99 MB |
787 | case -EBUSY: |
788 | wait_for_completion(&ctx->restart); | |
789 | INIT_COMPLETION(ctx->restart); | |
790 | /* fall through*/ | |
791 | case -EINPROGRESS: | |
c0297721 | 792 | this_cc->req = NULL; |
3f1e9070 MB |
793 | ctx->sector++; |
794 | continue; | |
795 | ||
796 | /* sync */ | |
3a7f6c99 | 797 | case 0: |
3f1e9070 | 798 | atomic_dec(&ctx->pending); |
3a7f6c99 | 799 | ctx->sector++; |
c7f1b204 | 800 | cond_resched(); |
3a7f6c99 | 801 | continue; |
3a7f6c99 | 802 | |
3f1e9070 MB |
803 | /* error */ |
804 | default: | |
805 | atomic_dec(&ctx->pending); | |
806 | return r; | |
807 | } | |
1da177e4 LT |
808 | } |
809 | ||
3f1e9070 | 810 | return 0; |
1da177e4 LT |
811 | } |
812 | ||
d469f841 MB |
813 | static void dm_crypt_bio_destructor(struct bio *bio) |
814 | { | |
028867ac | 815 | struct dm_crypt_io *io = bio->bi_private; |
6a24c718 MB |
816 | struct crypt_config *cc = io->target->private; |
817 | ||
818 | bio_free(bio, cc->bs); | |
d469f841 | 819 | } |
6a24c718 | 820 | |
1da177e4 LT |
821 | /* |
822 | * Generate a new unfragmented bio with the given size | |
823 | * This should never violate the device limitations | |
933f01d4 MB |
824 | * May return a smaller bio when running out of pages, indicated by |
825 | * *out_of_pages set to 1. | |
1da177e4 | 826 | */ |
933f01d4 MB |
827 | static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size, |
828 | unsigned *out_of_pages) | |
1da177e4 | 829 | { |
027581f3 | 830 | struct crypt_config *cc = io->target->private; |
8b004457 | 831 | struct bio *clone; |
1da177e4 | 832 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
b4e3ca1a | 833 | gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM; |
91e10625 MB |
834 | unsigned i, len; |
835 | struct page *page; | |
1da177e4 | 836 | |
2f9941b6 | 837 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
8b004457 | 838 | if (!clone) |
1da177e4 | 839 | return NULL; |
1da177e4 | 840 | |
027581f3 | 841 | clone_init(io, clone); |
933f01d4 | 842 | *out_of_pages = 0; |
6a24c718 | 843 | |
f97380bc | 844 | for (i = 0; i < nr_iovecs; i++) { |
91e10625 | 845 | page = mempool_alloc(cc->page_pool, gfp_mask); |
933f01d4 MB |
846 | if (!page) { |
847 | *out_of_pages = 1; | |
1da177e4 | 848 | break; |
933f01d4 | 849 | } |
1da177e4 LT |
850 | |
851 | /* | |
852 | * if additional pages cannot be allocated without waiting, | |
853 | * return a partially allocated bio, the caller will then try | |
854 | * to allocate additional bios while submitting this partial bio | |
855 | */ | |
f97380bc | 856 | if (i == (MIN_BIO_PAGES - 1)) |
1da177e4 LT |
857 | gfp_mask = (gfp_mask | __GFP_NOWARN) & ~__GFP_WAIT; |
858 | ||
91e10625 MB |
859 | len = (size > PAGE_SIZE) ? PAGE_SIZE : size; |
860 | ||
861 | if (!bio_add_page(clone, page, len, 0)) { | |
862 | mempool_free(page, cc->page_pool); | |
863 | break; | |
864 | } | |
1da177e4 | 865 | |
91e10625 | 866 | size -= len; |
1da177e4 LT |
867 | } |
868 | ||
8b004457 MB |
869 | if (!clone->bi_size) { |
870 | bio_put(clone); | |
1da177e4 LT |
871 | return NULL; |
872 | } | |
873 | ||
8b004457 | 874 | return clone; |
1da177e4 LT |
875 | } |
876 | ||
644bd2f0 | 877 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) |
1da177e4 | 878 | { |
644bd2f0 | 879 | unsigned int i; |
1da177e4 LT |
880 | struct bio_vec *bv; |
881 | ||
644bd2f0 | 882 | for (i = 0; i < clone->bi_vcnt; i++) { |
8b004457 | 883 | bv = bio_iovec_idx(clone, i); |
1da177e4 LT |
884 | BUG_ON(!bv->bv_page); |
885 | mempool_free(bv->bv_page, cc->page_pool); | |
886 | bv->bv_page = NULL; | |
887 | } | |
888 | } | |
889 | ||
dc440d1e MB |
890 | static struct dm_crypt_io *crypt_io_alloc(struct dm_target *ti, |
891 | struct bio *bio, sector_t sector) | |
892 | { | |
893 | struct crypt_config *cc = ti->private; | |
894 | struct dm_crypt_io *io; | |
895 | ||
896 | io = mempool_alloc(cc->io_pool, GFP_NOIO); | |
897 | io->target = ti; | |
898 | io->base_bio = bio; | |
899 | io->sector = sector; | |
900 | io->error = 0; | |
393b47ef | 901 | io->base_io = NULL; |
dc440d1e MB |
902 | atomic_set(&io->pending, 0); |
903 | ||
904 | return io; | |
905 | } | |
906 | ||
3e1a8bdd MB |
907 | static void crypt_inc_pending(struct dm_crypt_io *io) |
908 | { | |
909 | atomic_inc(&io->pending); | |
910 | } | |
911 | ||
1da177e4 LT |
912 | /* |
913 | * One of the bios was finished. Check for completion of | |
914 | * the whole request and correctly clean up the buffer. | |
393b47ef | 915 | * If base_io is set, wait for the last fragment to complete. |
1da177e4 | 916 | */ |
5742fd77 | 917 | static void crypt_dec_pending(struct dm_crypt_io *io) |
1da177e4 | 918 | { |
5742fd77 | 919 | struct crypt_config *cc = io->target->private; |
b35f8caa MB |
920 | struct bio *base_bio = io->base_bio; |
921 | struct dm_crypt_io *base_io = io->base_io; | |
922 | int error = io->error; | |
1da177e4 LT |
923 | |
924 | if (!atomic_dec_and_test(&io->pending)) | |
925 | return; | |
926 | ||
b35f8caa MB |
927 | mempool_free(io, cc->io_pool); |
928 | ||
929 | if (likely(!base_io)) | |
930 | bio_endio(base_bio, error); | |
393b47ef | 931 | else { |
b35f8caa MB |
932 | if (error && !base_io->error) |
933 | base_io->error = error; | |
934 | crypt_dec_pending(base_io); | |
393b47ef | 935 | } |
1da177e4 LT |
936 | } |
937 | ||
938 | /* | |
cabf08e4 | 939 | * kcryptd/kcryptd_io: |
1da177e4 LT |
940 | * |
941 | * Needed because it would be very unwise to do decryption in an | |
23541d2d | 942 | * interrupt context. |
cabf08e4 MB |
943 | * |
944 | * kcryptd performs the actual encryption or decryption. | |
945 | * | |
946 | * kcryptd_io performs the IO submission. | |
947 | * | |
948 | * They must be separated as otherwise the final stages could be | |
949 | * starved by new requests which can block in the first stages due | |
950 | * to memory allocation. | |
c0297721 AK |
951 | * |
952 | * The work is done per CPU global for all dm-crypt instances. | |
953 | * They should not depend on each other and do not block. | |
1da177e4 | 954 | */ |
6712ecf8 | 955 | static void crypt_endio(struct bio *clone, int error) |
8b004457 | 956 | { |
028867ac | 957 | struct dm_crypt_io *io = clone->bi_private; |
8b004457 | 958 | struct crypt_config *cc = io->target->private; |
ee7a491e | 959 | unsigned rw = bio_data_dir(clone); |
8b004457 | 960 | |
adfe4770 MB |
961 | if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error)) |
962 | error = -EIO; | |
963 | ||
8b004457 | 964 | /* |
6712ecf8 | 965 | * free the processed pages |
8b004457 | 966 | */ |
ee7a491e | 967 | if (rw == WRITE) |
644bd2f0 | 968 | crypt_free_buffer_pages(cc, clone); |
8b004457 MB |
969 | |
970 | bio_put(clone); | |
8b004457 | 971 | |
ee7a491e MB |
972 | if (rw == READ && !error) { |
973 | kcryptd_queue_crypt(io); | |
974 | return; | |
975 | } | |
5742fd77 MB |
976 | |
977 | if (unlikely(error)) | |
978 | io->error = error; | |
979 | ||
980 | crypt_dec_pending(io); | |
8b004457 MB |
981 | } |
982 | ||
028867ac | 983 | static void clone_init(struct dm_crypt_io *io, struct bio *clone) |
8b004457 MB |
984 | { |
985 | struct crypt_config *cc = io->target->private; | |
986 | ||
987 | clone->bi_private = io; | |
988 | clone->bi_end_io = crypt_endio; | |
989 | clone->bi_bdev = cc->dev->bdev; | |
990 | clone->bi_rw = io->base_bio->bi_rw; | |
027581f3 | 991 | clone->bi_destructor = dm_crypt_bio_destructor; |
8b004457 MB |
992 | } |
993 | ||
20c82538 | 994 | static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) |
8b004457 MB |
995 | { |
996 | struct crypt_config *cc = io->target->private; | |
997 | struct bio *base_bio = io->base_bio; | |
998 | struct bio *clone; | |
93e605c2 | 999 | |
8b004457 MB |
1000 | /* |
1001 | * The block layer might modify the bvec array, so always | |
1002 | * copy the required bvecs because we need the original | |
1003 | * one in order to decrypt the whole bio data *afterwards*. | |
1004 | */ | |
20c82538 | 1005 | clone = bio_alloc_bioset(gfp, bio_segments(base_bio), cc->bs); |
7eaceacc | 1006 | if (!clone) |
20c82538 | 1007 | return 1; |
8b004457 | 1008 | |
20c82538 MB |
1009 | crypt_inc_pending(io); |
1010 | ||
8b004457 MB |
1011 | clone_init(io, clone); |
1012 | clone->bi_idx = 0; | |
1013 | clone->bi_vcnt = bio_segments(base_bio); | |
1014 | clone->bi_size = base_bio->bi_size; | |
0c395b0f | 1015 | clone->bi_sector = cc->start + io->sector; |
8b004457 MB |
1016 | memcpy(clone->bi_io_vec, bio_iovec(base_bio), |
1017 | sizeof(struct bio_vec) * clone->bi_vcnt); | |
8b004457 | 1018 | |
93e605c2 | 1019 | generic_make_request(clone); |
20c82538 | 1020 | return 0; |
8b004457 MB |
1021 | } |
1022 | ||
4e4eef64 MB |
1023 | static void kcryptd_io_write(struct dm_crypt_io *io) |
1024 | { | |
95497a96 | 1025 | struct bio *clone = io->ctx.bio_out; |
95497a96 | 1026 | generic_make_request(clone); |
4e4eef64 MB |
1027 | } |
1028 | ||
395b167c AK |
1029 | static void kcryptd_io(struct work_struct *work) |
1030 | { | |
1031 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); | |
1032 | ||
20c82538 MB |
1033 | if (bio_data_dir(io->base_bio) == READ) { |
1034 | crypt_inc_pending(io); | |
1035 | if (kcryptd_io_read(io, GFP_NOIO)) | |
1036 | io->error = -ENOMEM; | |
1037 | crypt_dec_pending(io); | |
1038 | } else | |
395b167c AK |
1039 | kcryptd_io_write(io); |
1040 | } | |
1041 | ||
1042 | static void kcryptd_queue_io(struct dm_crypt_io *io) | |
1043 | { | |
1044 | struct crypt_config *cc = io->target->private; | |
1045 | ||
1046 | INIT_WORK(&io->work, kcryptd_io); | |
1047 | queue_work(cc->io_queue, &io->work); | |
1048 | } | |
1049 | ||
95497a96 MB |
1050 | static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, |
1051 | int error, int async) | |
4e4eef64 | 1052 | { |
dec1cedf MB |
1053 | struct bio *clone = io->ctx.bio_out; |
1054 | struct crypt_config *cc = io->target->private; | |
1055 | ||
1056 | if (unlikely(error < 0)) { | |
1057 | crypt_free_buffer_pages(cc, clone); | |
1058 | bio_put(clone); | |
1059 | io->error = -EIO; | |
6c031f41 | 1060 | crypt_dec_pending(io); |
dec1cedf MB |
1061 | return; |
1062 | } | |
1063 | ||
1064 | /* crypt_convert should have filled the clone bio */ | |
1065 | BUG_ON(io->ctx.idx_out < clone->bi_vcnt); | |
1066 | ||
1067 | clone->bi_sector = cc->start + io->sector; | |
899c95d3 | 1068 | |
95497a96 MB |
1069 | if (async) |
1070 | kcryptd_queue_io(io); | |
1e37bb8e | 1071 | else |
95497a96 | 1072 | generic_make_request(clone); |
4e4eef64 MB |
1073 | } |
1074 | ||
fc5a5e9a | 1075 | static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) |
8b004457 MB |
1076 | { |
1077 | struct crypt_config *cc = io->target->private; | |
8b004457 | 1078 | struct bio *clone; |
393b47ef | 1079 | struct dm_crypt_io *new_io; |
c8081618 | 1080 | int crypt_finished; |
933f01d4 | 1081 | unsigned out_of_pages = 0; |
dec1cedf | 1082 | unsigned remaining = io->base_bio->bi_size; |
b635b00e | 1083 | sector_t sector = io->sector; |
dec1cedf | 1084 | int r; |
8b004457 | 1085 | |
fc5a5e9a MB |
1086 | /* |
1087 | * Prevent io from disappearing until this function completes. | |
1088 | */ | |
1089 | crypt_inc_pending(io); | |
b635b00e | 1090 | crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); |
fc5a5e9a | 1091 | |
93e605c2 MB |
1092 | /* |
1093 | * The allocated buffers can be smaller than the whole bio, | |
1094 | * so repeat the whole process until all the data can be handled. | |
1095 | */ | |
1096 | while (remaining) { | |
933f01d4 | 1097 | clone = crypt_alloc_buffer(io, remaining, &out_of_pages); |
23541d2d | 1098 | if (unlikely(!clone)) { |
5742fd77 | 1099 | io->error = -ENOMEM; |
fc5a5e9a | 1100 | break; |
23541d2d | 1101 | } |
93e605c2 | 1102 | |
53017030 MB |
1103 | io->ctx.bio_out = clone; |
1104 | io->ctx.idx_out = 0; | |
93e605c2 | 1105 | |
dec1cedf | 1106 | remaining -= clone->bi_size; |
b635b00e | 1107 | sector += bio_sectors(clone); |
93e605c2 | 1108 | |
4e594098 | 1109 | crypt_inc_pending(io); |
dec1cedf | 1110 | r = crypt_convert(cc, &io->ctx); |
c8081618 | 1111 | crypt_finished = atomic_dec_and_test(&io->ctx.pending); |
f97380bc | 1112 | |
c8081618 MB |
1113 | /* Encryption was already finished, submit io now */ |
1114 | if (crypt_finished) { | |
3a7f6c99 | 1115 | kcryptd_crypt_write_io_submit(io, r, 0); |
c8081618 MB |
1116 | |
1117 | /* | |
1118 | * If there was an error, do not try next fragments. | |
1119 | * For async, error is processed in async handler. | |
1120 | */ | |
6c031f41 | 1121 | if (unlikely(r < 0)) |
fc5a5e9a | 1122 | break; |
b635b00e MB |
1123 | |
1124 | io->sector = sector; | |
4e594098 | 1125 | } |
93e605c2 | 1126 | |
933f01d4 MB |
1127 | /* |
1128 | * Out of memory -> run queues | |
1129 | * But don't wait if split was due to the io size restriction | |
1130 | */ | |
1131 | if (unlikely(out_of_pages)) | |
8aa7e847 | 1132 | congestion_wait(BLK_RW_ASYNC, HZ/100); |
933f01d4 | 1133 | |
393b47ef MB |
1134 | /* |
1135 | * With async crypto it is unsafe to share the crypto context | |
1136 | * between fragments, so switch to a new dm_crypt_io structure. | |
1137 | */ | |
1138 | if (unlikely(!crypt_finished && remaining)) { | |
1139 | new_io = crypt_io_alloc(io->target, io->base_bio, | |
1140 | sector); | |
1141 | crypt_inc_pending(new_io); | |
1142 | crypt_convert_init(cc, &new_io->ctx, NULL, | |
1143 | io->base_bio, sector); | |
1144 | new_io->ctx.idx_in = io->ctx.idx_in; | |
1145 | new_io->ctx.offset_in = io->ctx.offset_in; | |
1146 | ||
1147 | /* | |
1148 | * Fragments after the first use the base_io | |
1149 | * pending count. | |
1150 | */ | |
1151 | if (!io->base_io) | |
1152 | new_io->base_io = io; | |
1153 | else { | |
1154 | new_io->base_io = io->base_io; | |
1155 | crypt_inc_pending(io->base_io); | |
1156 | crypt_dec_pending(io); | |
1157 | } | |
1158 | ||
1159 | io = new_io; | |
1160 | } | |
93e605c2 | 1161 | } |
899c95d3 MB |
1162 | |
1163 | crypt_dec_pending(io); | |
84131db6 MB |
1164 | } |
1165 | ||
4e4eef64 | 1166 | static void kcryptd_crypt_read_done(struct dm_crypt_io *io, int error) |
5742fd77 MB |
1167 | { |
1168 | if (unlikely(error < 0)) | |
1169 | io->error = -EIO; | |
1170 | ||
1171 | crypt_dec_pending(io); | |
1172 | } | |
1173 | ||
4e4eef64 | 1174 | static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) |
8b004457 MB |
1175 | { |
1176 | struct crypt_config *cc = io->target->private; | |
5742fd77 | 1177 | int r = 0; |
1da177e4 | 1178 | |
3e1a8bdd | 1179 | crypt_inc_pending(io); |
3a7f6c99 | 1180 | |
53017030 | 1181 | crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, |
0c395b0f | 1182 | io->sector); |
1da177e4 | 1183 | |
5742fd77 MB |
1184 | r = crypt_convert(cc, &io->ctx); |
1185 | ||
3f1e9070 | 1186 | if (atomic_dec_and_test(&io->ctx.pending)) |
3a7f6c99 MB |
1187 | kcryptd_crypt_read_done(io, r); |
1188 | ||
1189 | crypt_dec_pending(io); | |
1da177e4 LT |
1190 | } |
1191 | ||
95497a96 MB |
1192 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
1193 | int error) | |
1194 | { | |
b2174eeb HY |
1195 | struct dm_crypt_request *dmreq = async_req->data; |
1196 | struct convert_context *ctx = dmreq->ctx; | |
95497a96 MB |
1197 | struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); |
1198 | struct crypt_config *cc = io->target->private; | |
1199 | ||
1200 | if (error == -EINPROGRESS) { | |
1201 | complete(&ctx->restart); | |
1202 | return; | |
1203 | } | |
1204 | ||
2dc5327d MB |
1205 | if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) |
1206 | error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq); | |
1207 | ||
b2174eeb | 1208 | mempool_free(req_of_dmreq(cc, dmreq), cc->req_pool); |
95497a96 MB |
1209 | |
1210 | if (!atomic_dec_and_test(&ctx->pending)) | |
1211 | return; | |
1212 | ||
1213 | if (bio_data_dir(io->base_bio) == READ) | |
1214 | kcryptd_crypt_read_done(io, error); | |
1215 | else | |
1216 | kcryptd_crypt_write_io_submit(io, error, 1); | |
1217 | } | |
1218 | ||
395b167c | 1219 | static void kcryptd_crypt(struct work_struct *work) |
1da177e4 | 1220 | { |
028867ac | 1221 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
8b004457 | 1222 | |
cabf08e4 | 1223 | if (bio_data_dir(io->base_bio) == READ) |
395b167c | 1224 | kcryptd_crypt_read_convert(io); |
4e4eef64 | 1225 | else |
395b167c | 1226 | kcryptd_crypt_write_convert(io); |
cabf08e4 MB |
1227 | } |
1228 | ||
395b167c | 1229 | static void kcryptd_queue_crypt(struct dm_crypt_io *io) |
cabf08e4 | 1230 | { |
395b167c | 1231 | struct crypt_config *cc = io->target->private; |
cabf08e4 | 1232 | |
395b167c AK |
1233 | INIT_WORK(&io->work, kcryptd_crypt); |
1234 | queue_work(cc->crypt_queue, &io->work); | |
1da177e4 LT |
1235 | } |
1236 | ||
1237 | /* | |
1238 | * Decode key from its hex representation | |
1239 | */ | |
1240 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) | |
1241 | { | |
1242 | char buffer[3]; | |
1243 | char *endp; | |
1244 | unsigned int i; | |
1245 | ||
1246 | buffer[2] = '\0'; | |
1247 | ||
8b004457 | 1248 | for (i = 0; i < size; i++) { |
1da177e4 LT |
1249 | buffer[0] = *hex++; |
1250 | buffer[1] = *hex++; | |
1251 | ||
1252 | key[i] = (u8)simple_strtoul(buffer, &endp, 16); | |
1253 | ||
1254 | if (endp != &buffer[2]) | |
1255 | return -EINVAL; | |
1256 | } | |
1257 | ||
1258 | if (*hex != '\0') | |
1259 | return -EINVAL; | |
1260 | ||
1261 | return 0; | |
1262 | } | |
1263 | ||
1264 | /* | |
1265 | * Encode key into its hex representation | |
1266 | */ | |
1267 | static void crypt_encode_key(char *hex, u8 *key, unsigned int size) | |
1268 | { | |
1269 | unsigned int i; | |
1270 | ||
8b004457 | 1271 | for (i = 0; i < size; i++) { |
1da177e4 LT |
1272 | sprintf(hex, "%02x", *key); |
1273 | hex += 2; | |
1274 | key++; | |
1275 | } | |
1276 | } | |
1277 | ||
d1f96423 MB |
1278 | static void crypt_free_tfms(struct crypt_config *cc, int cpu) |
1279 | { | |
1280 | struct crypt_cpu *cpu_cc = per_cpu_ptr(cc->cpu, cpu); | |
1281 | unsigned i; | |
1282 | ||
1283 | for (i = 0; i < cc->tfms_count; i++) | |
1284 | if (cpu_cc->tfms[i] && !IS_ERR(cpu_cc->tfms[i])) { | |
1285 | crypto_free_ablkcipher(cpu_cc->tfms[i]); | |
1286 | cpu_cc->tfms[i] = NULL; | |
1287 | } | |
1288 | } | |
1289 | ||
1290 | static int crypt_alloc_tfms(struct crypt_config *cc, int cpu, char *ciphermode) | |
1291 | { | |
1292 | struct crypt_cpu *cpu_cc = per_cpu_ptr(cc->cpu, cpu); | |
1293 | unsigned i; | |
1294 | int err; | |
1295 | ||
1296 | for (i = 0; i < cc->tfms_count; i++) { | |
1297 | cpu_cc->tfms[i] = crypto_alloc_ablkcipher(ciphermode, 0, 0); | |
1298 | if (IS_ERR(cpu_cc->tfms[i])) { | |
1299 | err = PTR_ERR(cpu_cc->tfms[i]); | |
1300 | crypt_free_tfms(cc, cpu); | |
1301 | return err; | |
1302 | } | |
1303 | } | |
1304 | ||
1305 | return 0; | |
1306 | } | |
1307 | ||
c0297721 AK |
1308 | static int crypt_setkey_allcpus(struct crypt_config *cc) |
1309 | { | |
d1f96423 MB |
1310 | unsigned subkey_size = cc->key_size >> ilog2(cc->tfms_count); |
1311 | int cpu, err = 0, i, r; | |
c0297721 AK |
1312 | |
1313 | for_each_possible_cpu(cpu) { | |
d1f96423 MB |
1314 | for (i = 0; i < cc->tfms_count; i++) { |
1315 | r = crypto_ablkcipher_setkey(per_cpu_ptr(cc->cpu, cpu)->tfms[i], | |
1316 | cc->key + (i * subkey_size), subkey_size); | |
1317 | if (r) | |
1318 | err = r; | |
1319 | } | |
c0297721 AK |
1320 | } |
1321 | ||
1322 | return err; | |
1323 | } | |
1324 | ||
e48d4bbf MB |
1325 | static int crypt_set_key(struct crypt_config *cc, char *key) |
1326 | { | |
de8be5ac MB |
1327 | int r = -EINVAL; |
1328 | int key_string_len = strlen(key); | |
1329 | ||
69a8cfcd | 1330 | /* The key size may not be changed. */ |
de8be5ac MB |
1331 | if (cc->key_size != (key_string_len >> 1)) |
1332 | goto out; | |
e48d4bbf | 1333 | |
69a8cfcd MB |
1334 | /* Hyphen (which gives a key_size of zero) means there is no key. */ |
1335 | if (!cc->key_size && strcmp(key, "-")) | |
de8be5ac | 1336 | goto out; |
e48d4bbf | 1337 | |
69a8cfcd | 1338 | if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0) |
de8be5ac | 1339 | goto out; |
e48d4bbf MB |
1340 | |
1341 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1342 | ||
de8be5ac MB |
1343 | r = crypt_setkey_allcpus(cc); |
1344 | ||
1345 | out: | |
1346 | /* Hex key string not needed after here, so wipe it. */ | |
1347 | memset(key, '0', key_string_len); | |
1348 | ||
1349 | return r; | |
e48d4bbf MB |
1350 | } |
1351 | ||
1352 | static int crypt_wipe_key(struct crypt_config *cc) | |
1353 | { | |
1354 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1355 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); | |
c0297721 AK |
1356 | |
1357 | return crypt_setkey_allcpus(cc); | |
e48d4bbf MB |
1358 | } |
1359 | ||
28513fcc MB |
1360 | static void crypt_dtr(struct dm_target *ti) |
1361 | { | |
1362 | struct crypt_config *cc = ti->private; | |
c0297721 AK |
1363 | struct crypt_cpu *cpu_cc; |
1364 | int cpu; | |
28513fcc MB |
1365 | |
1366 | ti->private = NULL; | |
1367 | ||
1368 | if (!cc) | |
1369 | return; | |
1370 | ||
1371 | if (cc->io_queue) | |
1372 | destroy_workqueue(cc->io_queue); | |
1373 | if (cc->crypt_queue) | |
1374 | destroy_workqueue(cc->crypt_queue); | |
1375 | ||
c0297721 AK |
1376 | if (cc->cpu) |
1377 | for_each_possible_cpu(cpu) { | |
1378 | cpu_cc = per_cpu_ptr(cc->cpu, cpu); | |
1379 | if (cpu_cc->req) | |
1380 | mempool_free(cpu_cc->req, cc->req_pool); | |
d1f96423 | 1381 | crypt_free_tfms(cc, cpu); |
c0297721 AK |
1382 | } |
1383 | ||
28513fcc MB |
1384 | if (cc->bs) |
1385 | bioset_free(cc->bs); | |
1386 | ||
1387 | if (cc->page_pool) | |
1388 | mempool_destroy(cc->page_pool); | |
1389 | if (cc->req_pool) | |
1390 | mempool_destroy(cc->req_pool); | |
1391 | if (cc->io_pool) | |
1392 | mempool_destroy(cc->io_pool); | |
1393 | ||
1394 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) | |
1395 | cc->iv_gen_ops->dtr(cc); | |
1396 | ||
28513fcc MB |
1397 | if (cc->dev) |
1398 | dm_put_device(ti, cc->dev); | |
1399 | ||
c0297721 AK |
1400 | if (cc->cpu) |
1401 | free_percpu(cc->cpu); | |
1402 | ||
5ebaee6d | 1403 | kzfree(cc->cipher); |
7dbcd137 | 1404 | kzfree(cc->cipher_string); |
28513fcc MB |
1405 | |
1406 | /* Must zero key material before freeing */ | |
1407 | kzfree(cc); | |
1408 | } | |
1409 | ||
5ebaee6d MB |
1410 | static int crypt_ctr_cipher(struct dm_target *ti, |
1411 | char *cipher_in, char *key) | |
1da177e4 | 1412 | { |
5ebaee6d | 1413 | struct crypt_config *cc = ti->private; |
d1f96423 | 1414 | char *tmp, *cipher, *chainmode, *ivmode, *ivopts, *keycount; |
5ebaee6d | 1415 | char *cipher_api = NULL; |
c0297721 | 1416 | int cpu, ret = -EINVAL; |
1da177e4 | 1417 | |
5ebaee6d MB |
1418 | /* Convert to crypto api definition? */ |
1419 | if (strchr(cipher_in, '(')) { | |
1420 | ti->error = "Bad cipher specification"; | |
1da177e4 LT |
1421 | return -EINVAL; |
1422 | } | |
1423 | ||
7dbcd137 MB |
1424 | cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); |
1425 | if (!cc->cipher_string) | |
1426 | goto bad_mem; | |
1427 | ||
5ebaee6d MB |
1428 | /* |
1429 | * Legacy dm-crypt cipher specification | |
d1f96423 | 1430 | * cipher[:keycount]-mode-iv:ivopts |
5ebaee6d MB |
1431 | */ |
1432 | tmp = cipher_in; | |
d1f96423 MB |
1433 | keycount = strsep(&tmp, "-"); |
1434 | cipher = strsep(&keycount, ":"); | |
1435 | ||
1436 | if (!keycount) | |
1437 | cc->tfms_count = 1; | |
1438 | else if (sscanf(keycount, "%u", &cc->tfms_count) != 1 || | |
1439 | !is_power_of_2(cc->tfms_count)) { | |
1440 | ti->error = "Bad cipher key count specification"; | |
1441 | return -EINVAL; | |
1442 | } | |
1443 | cc->key_parts = cc->tfms_count; | |
5ebaee6d MB |
1444 | |
1445 | cc->cipher = kstrdup(cipher, GFP_KERNEL); | |
1446 | if (!cc->cipher) | |
1447 | goto bad_mem; | |
1448 | ||
1da177e4 LT |
1449 | chainmode = strsep(&tmp, "-"); |
1450 | ivopts = strsep(&tmp, "-"); | |
1451 | ivmode = strsep(&ivopts, ":"); | |
1452 | ||
1453 | if (tmp) | |
5ebaee6d | 1454 | DMWARN("Ignoring unexpected additional cipher options"); |
1da177e4 | 1455 | |
d1f96423 MB |
1456 | cc->cpu = __alloc_percpu(sizeof(*(cc->cpu)) + |
1457 | cc->tfms_count * sizeof(*(cc->cpu->tfms)), | |
1458 | __alignof__(struct crypt_cpu)); | |
c0297721 AK |
1459 | if (!cc->cpu) { |
1460 | ti->error = "Cannot allocate per cpu state"; | |
1461 | goto bad_mem; | |
1462 | } | |
1463 | ||
7dbcd137 MB |
1464 | /* |
1465 | * For compatibility with the original dm-crypt mapping format, if | |
1466 | * only the cipher name is supplied, use cbc-plain. | |
1467 | */ | |
5ebaee6d | 1468 | if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) { |
1da177e4 LT |
1469 | chainmode = "cbc"; |
1470 | ivmode = "plain"; | |
1471 | } | |
1472 | ||
d1806f6a | 1473 | if (strcmp(chainmode, "ecb") && !ivmode) { |
5ebaee6d MB |
1474 | ti->error = "IV mechanism required"; |
1475 | return -EINVAL; | |
1da177e4 LT |
1476 | } |
1477 | ||
5ebaee6d MB |
1478 | cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); |
1479 | if (!cipher_api) | |
1480 | goto bad_mem; | |
1481 | ||
1482 | ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, | |
1483 | "%s(%s)", chainmode, cipher); | |
1484 | if (ret < 0) { | |
1485 | kfree(cipher_api); | |
1486 | goto bad_mem; | |
1da177e4 LT |
1487 | } |
1488 | ||
5ebaee6d | 1489 | /* Allocate cipher */ |
c0297721 | 1490 | for_each_possible_cpu(cpu) { |
d1f96423 MB |
1491 | ret = crypt_alloc_tfms(cc, cpu, cipher_api); |
1492 | if (ret < 0) { | |
c0297721 AK |
1493 | ti->error = "Error allocating crypto tfm"; |
1494 | goto bad; | |
1495 | } | |
1da177e4 | 1496 | } |
1da177e4 | 1497 | |
5ebaee6d MB |
1498 | /* Initialize and set key */ |
1499 | ret = crypt_set_key(cc, key); | |
28513fcc | 1500 | if (ret < 0) { |
0b430958 | 1501 | ti->error = "Error decoding and setting key"; |
28513fcc | 1502 | goto bad; |
0b430958 MB |
1503 | } |
1504 | ||
5ebaee6d | 1505 | /* Initialize IV */ |
c0297721 | 1506 | cc->iv_size = crypto_ablkcipher_ivsize(any_tfm(cc)); |
5ebaee6d MB |
1507 | if (cc->iv_size) |
1508 | /* at least a 64 bit sector number should fit in our buffer */ | |
1509 | cc->iv_size = max(cc->iv_size, | |
1510 | (unsigned int)(sizeof(u64) / sizeof(u8))); | |
1511 | else if (ivmode) { | |
1512 | DMWARN("Selected cipher does not support IVs"); | |
1513 | ivmode = NULL; | |
1514 | } | |
1515 | ||
1516 | /* Choose ivmode, see comments at iv code. */ | |
1da177e4 LT |
1517 | if (ivmode == NULL) |
1518 | cc->iv_gen_ops = NULL; | |
1519 | else if (strcmp(ivmode, "plain") == 0) | |
1520 | cc->iv_gen_ops = &crypt_iv_plain_ops; | |
61afef61 MB |
1521 | else if (strcmp(ivmode, "plain64") == 0) |
1522 | cc->iv_gen_ops = &crypt_iv_plain64_ops; | |
1da177e4 LT |
1523 | else if (strcmp(ivmode, "essiv") == 0) |
1524 | cc->iv_gen_ops = &crypt_iv_essiv_ops; | |
48527fa7 RS |
1525 | else if (strcmp(ivmode, "benbi") == 0) |
1526 | cc->iv_gen_ops = &crypt_iv_benbi_ops; | |
46b47730 LN |
1527 | else if (strcmp(ivmode, "null") == 0) |
1528 | cc->iv_gen_ops = &crypt_iv_null_ops; | |
34745785 MB |
1529 | else if (strcmp(ivmode, "lmk") == 0) { |
1530 | cc->iv_gen_ops = &crypt_iv_lmk_ops; | |
1531 | /* Version 2 and 3 is recognised according | |
1532 | * to length of provided multi-key string. | |
1533 | * If present (version 3), last key is used as IV seed. | |
1534 | */ | |
1535 | if (cc->key_size % cc->key_parts) | |
1536 | cc->key_parts++; | |
1537 | } else { | |
5ebaee6d | 1538 | ret = -EINVAL; |
72d94861 | 1539 | ti->error = "Invalid IV mode"; |
28513fcc | 1540 | goto bad; |
1da177e4 LT |
1541 | } |
1542 | ||
28513fcc MB |
1543 | /* Allocate IV */ |
1544 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { | |
1545 | ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); | |
1546 | if (ret < 0) { | |
1547 | ti->error = "Error creating IV"; | |
1548 | goto bad; | |
1549 | } | |
1550 | } | |
1da177e4 | 1551 | |
28513fcc MB |
1552 | /* Initialize IV (set keys for ESSIV etc) */ |
1553 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) { | |
1554 | ret = cc->iv_gen_ops->init(cc); | |
1555 | if (ret < 0) { | |
1556 | ti->error = "Error initialising IV"; | |
1557 | goto bad; | |
1558 | } | |
b95bf2d3 MB |
1559 | } |
1560 | ||
5ebaee6d MB |
1561 | ret = 0; |
1562 | bad: | |
1563 | kfree(cipher_api); | |
1564 | return ret; | |
1565 | ||
1566 | bad_mem: | |
1567 | ti->error = "Cannot allocate cipher strings"; | |
1568 | return -ENOMEM; | |
1569 | } | |
1570 | ||
1571 | /* | |
1572 | * Construct an encryption mapping: | |
1573 | * <cipher> <key> <iv_offset> <dev_path> <start> | |
1574 | */ | |
1575 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
1576 | { | |
1577 | struct crypt_config *cc; | |
1578 | unsigned int key_size; | |
1579 | unsigned long long tmpll; | |
1580 | int ret; | |
1581 | ||
1582 | if (argc != 5) { | |
1583 | ti->error = "Not enough arguments"; | |
1584 | return -EINVAL; | |
1da177e4 LT |
1585 | } |
1586 | ||
5ebaee6d MB |
1587 | key_size = strlen(argv[1]) >> 1; |
1588 | ||
1589 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); | |
1590 | if (!cc) { | |
1591 | ti->error = "Cannot allocate encryption context"; | |
1592 | return -ENOMEM; | |
1593 | } | |
69a8cfcd | 1594 | cc->key_size = key_size; |
5ebaee6d MB |
1595 | |
1596 | ti->private = cc; | |
1597 | ret = crypt_ctr_cipher(ti, argv[0], argv[1]); | |
1598 | if (ret < 0) | |
1599 | goto bad; | |
1600 | ||
28513fcc | 1601 | ret = -ENOMEM; |
93d2341c | 1602 | cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool); |
1da177e4 | 1603 | if (!cc->io_pool) { |
72d94861 | 1604 | ti->error = "Cannot allocate crypt io mempool"; |
28513fcc | 1605 | goto bad; |
1da177e4 LT |
1606 | } |
1607 | ||
ddd42edf | 1608 | cc->dmreq_start = sizeof(struct ablkcipher_request); |
c0297721 | 1609 | cc->dmreq_start += crypto_ablkcipher_reqsize(any_tfm(cc)); |
ddd42edf | 1610 | cc->dmreq_start = ALIGN(cc->dmreq_start, crypto_tfm_ctx_alignment()); |
c0297721 | 1611 | cc->dmreq_start += crypto_ablkcipher_alignmask(any_tfm(cc)) & |
3a7f6c99 | 1612 | ~(crypto_tfm_ctx_alignment() - 1); |
ddd42edf MB |
1613 | |
1614 | cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + | |
1615 | sizeof(struct dm_crypt_request) + cc->iv_size); | |
1616 | if (!cc->req_pool) { | |
1617 | ti->error = "Cannot allocate crypt request mempool"; | |
28513fcc | 1618 | goto bad; |
ddd42edf | 1619 | } |
ddd42edf | 1620 | |
a19b27ce | 1621 | cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0); |
1da177e4 | 1622 | if (!cc->page_pool) { |
72d94861 | 1623 | ti->error = "Cannot allocate page mempool"; |
28513fcc | 1624 | goto bad; |
1da177e4 LT |
1625 | } |
1626 | ||
bb799ca0 | 1627 | cc->bs = bioset_create(MIN_IOS, 0); |
6a24c718 MB |
1628 | if (!cc->bs) { |
1629 | ti->error = "Cannot allocate crypt bioset"; | |
28513fcc | 1630 | goto bad; |
6a24c718 MB |
1631 | } |
1632 | ||
28513fcc | 1633 | ret = -EINVAL; |
4ee218cd | 1634 | if (sscanf(argv[2], "%llu", &tmpll) != 1) { |
72d94861 | 1635 | ti->error = "Invalid iv_offset sector"; |
28513fcc | 1636 | goto bad; |
1da177e4 | 1637 | } |
4ee218cd | 1638 | cc->iv_offset = tmpll; |
1da177e4 | 1639 | |
28513fcc MB |
1640 | if (dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev)) { |
1641 | ti->error = "Device lookup failed"; | |
1642 | goto bad; | |
1643 | } | |
1644 | ||
4ee218cd | 1645 | if (sscanf(argv[4], "%llu", &tmpll) != 1) { |
72d94861 | 1646 | ti->error = "Invalid device sector"; |
28513fcc | 1647 | goto bad; |
1da177e4 | 1648 | } |
4ee218cd | 1649 | cc->start = tmpll; |
1da177e4 | 1650 | |
28513fcc | 1651 | ret = -ENOMEM; |
c0297721 AK |
1652 | cc->io_queue = alloc_workqueue("kcryptd_io", |
1653 | WQ_NON_REENTRANT| | |
1654 | WQ_MEM_RECLAIM, | |
1655 | 1); | |
cabf08e4 MB |
1656 | if (!cc->io_queue) { |
1657 | ti->error = "Couldn't create kcryptd io queue"; | |
28513fcc | 1658 | goto bad; |
cabf08e4 MB |
1659 | } |
1660 | ||
c0297721 AK |
1661 | cc->crypt_queue = alloc_workqueue("kcryptd", |
1662 | WQ_NON_REENTRANT| | |
1663 | WQ_CPU_INTENSIVE| | |
1664 | WQ_MEM_RECLAIM, | |
1665 | 1); | |
cabf08e4 | 1666 | if (!cc->crypt_queue) { |
9934a8be | 1667 | ti->error = "Couldn't create kcryptd queue"; |
28513fcc | 1668 | goto bad; |
9934a8be MB |
1669 | } |
1670 | ||
647c7db1 | 1671 | ti->num_flush_requests = 1; |
1da177e4 LT |
1672 | return 0; |
1673 | ||
28513fcc MB |
1674 | bad: |
1675 | crypt_dtr(ti); | |
1676 | return ret; | |
1da177e4 LT |
1677 | } |
1678 | ||
1da177e4 LT |
1679 | static int crypt_map(struct dm_target *ti, struct bio *bio, |
1680 | union map_info *map_context) | |
1681 | { | |
028867ac | 1682 | struct dm_crypt_io *io; |
647c7db1 MP |
1683 | struct crypt_config *cc; |
1684 | ||
d87f4c14 | 1685 | if (bio->bi_rw & REQ_FLUSH) { |
647c7db1 MP |
1686 | cc = ti->private; |
1687 | bio->bi_bdev = cc->dev->bdev; | |
1688 | return DM_MAPIO_REMAPPED; | |
1689 | } | |
1da177e4 | 1690 | |
b441a262 | 1691 | io = crypt_io_alloc(ti, bio, dm_target_offset(ti, bio->bi_sector)); |
cabf08e4 | 1692 | |
20c82538 MB |
1693 | if (bio_data_dir(io->base_bio) == READ) { |
1694 | if (kcryptd_io_read(io, GFP_NOWAIT)) | |
1695 | kcryptd_queue_io(io); | |
1696 | } else | |
cabf08e4 | 1697 | kcryptd_queue_crypt(io); |
1da177e4 | 1698 | |
d2a7ad29 | 1699 | return DM_MAPIO_SUBMITTED; |
1da177e4 LT |
1700 | } |
1701 | ||
1702 | static int crypt_status(struct dm_target *ti, status_type_t type, | |
1703 | char *result, unsigned int maxlen) | |
1704 | { | |
5ebaee6d | 1705 | struct crypt_config *cc = ti->private; |
1da177e4 LT |
1706 | unsigned int sz = 0; |
1707 | ||
1708 | switch (type) { | |
1709 | case STATUSTYPE_INFO: | |
1710 | result[0] = '\0'; | |
1711 | break; | |
1712 | ||
1713 | case STATUSTYPE_TABLE: | |
7dbcd137 | 1714 | DMEMIT("%s ", cc->cipher_string); |
1da177e4 LT |
1715 | |
1716 | if (cc->key_size > 0) { | |
1717 | if ((maxlen - sz) < ((cc->key_size << 1) + 1)) | |
1718 | return -ENOMEM; | |
1719 | ||
1720 | crypt_encode_key(result + sz, cc->key, cc->key_size); | |
1721 | sz += cc->key_size << 1; | |
1722 | } else { | |
1723 | if (sz >= maxlen) | |
1724 | return -ENOMEM; | |
1725 | result[sz++] = '-'; | |
1726 | } | |
1727 | ||
4ee218cd AM |
1728 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
1729 | cc->dev->name, (unsigned long long)cc->start); | |
1da177e4 LT |
1730 | break; |
1731 | } | |
1732 | return 0; | |
1733 | } | |
1734 | ||
e48d4bbf MB |
1735 | static void crypt_postsuspend(struct dm_target *ti) |
1736 | { | |
1737 | struct crypt_config *cc = ti->private; | |
1738 | ||
1739 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1740 | } | |
1741 | ||
1742 | static int crypt_preresume(struct dm_target *ti) | |
1743 | { | |
1744 | struct crypt_config *cc = ti->private; | |
1745 | ||
1746 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { | |
1747 | DMERR("aborting resume - crypt key is not set."); | |
1748 | return -EAGAIN; | |
1749 | } | |
1750 | ||
1751 | return 0; | |
1752 | } | |
1753 | ||
1754 | static void crypt_resume(struct dm_target *ti) | |
1755 | { | |
1756 | struct crypt_config *cc = ti->private; | |
1757 | ||
1758 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1759 | } | |
1760 | ||
1761 | /* Message interface | |
1762 | * key set <key> | |
1763 | * key wipe | |
1764 | */ | |
1765 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) | |
1766 | { | |
1767 | struct crypt_config *cc = ti->private; | |
542da317 | 1768 | int ret = -EINVAL; |
e48d4bbf MB |
1769 | |
1770 | if (argc < 2) | |
1771 | goto error; | |
1772 | ||
1773 | if (!strnicmp(argv[0], MESG_STR("key"))) { | |
1774 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { | |
1775 | DMWARN("not suspended during key manipulation."); | |
1776 | return -EINVAL; | |
1777 | } | |
542da317 MB |
1778 | if (argc == 3 && !strnicmp(argv[1], MESG_STR("set"))) { |
1779 | ret = crypt_set_key(cc, argv[2]); | |
1780 | if (ret) | |
1781 | return ret; | |
1782 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) | |
1783 | ret = cc->iv_gen_ops->init(cc); | |
1784 | return ret; | |
1785 | } | |
1786 | if (argc == 2 && !strnicmp(argv[1], MESG_STR("wipe"))) { | |
1787 | if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { | |
1788 | ret = cc->iv_gen_ops->wipe(cc); | |
1789 | if (ret) | |
1790 | return ret; | |
1791 | } | |
e48d4bbf | 1792 | return crypt_wipe_key(cc); |
542da317 | 1793 | } |
e48d4bbf MB |
1794 | } |
1795 | ||
1796 | error: | |
1797 | DMWARN("unrecognised message received."); | |
1798 | return -EINVAL; | |
1799 | } | |
1800 | ||
d41e26b9 MB |
1801 | static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm, |
1802 | struct bio_vec *biovec, int max_size) | |
1803 | { | |
1804 | struct crypt_config *cc = ti->private; | |
1805 | struct request_queue *q = bdev_get_queue(cc->dev->bdev); | |
1806 | ||
1807 | if (!q->merge_bvec_fn) | |
1808 | return max_size; | |
1809 | ||
1810 | bvm->bi_bdev = cc->dev->bdev; | |
b441a262 | 1811 | bvm->bi_sector = cc->start + dm_target_offset(ti, bvm->bi_sector); |
d41e26b9 MB |
1812 | |
1813 | return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); | |
1814 | } | |
1815 | ||
af4874e0 MS |
1816 | static int crypt_iterate_devices(struct dm_target *ti, |
1817 | iterate_devices_callout_fn fn, void *data) | |
1818 | { | |
1819 | struct crypt_config *cc = ti->private; | |
1820 | ||
5dea271b | 1821 | return fn(ti, cc->dev, cc->start, ti->len, data); |
af4874e0 MS |
1822 | } |
1823 | ||
1da177e4 LT |
1824 | static struct target_type crypt_target = { |
1825 | .name = "crypt", | |
d1f96423 | 1826 | .version = {1, 10, 0}, |
1da177e4 LT |
1827 | .module = THIS_MODULE, |
1828 | .ctr = crypt_ctr, | |
1829 | .dtr = crypt_dtr, | |
1830 | .map = crypt_map, | |
1831 | .status = crypt_status, | |
e48d4bbf MB |
1832 | .postsuspend = crypt_postsuspend, |
1833 | .preresume = crypt_preresume, | |
1834 | .resume = crypt_resume, | |
1835 | .message = crypt_message, | |
d41e26b9 | 1836 | .merge = crypt_merge, |
af4874e0 | 1837 | .iterate_devices = crypt_iterate_devices, |
1da177e4 LT |
1838 | }; |
1839 | ||
1840 | static int __init dm_crypt_init(void) | |
1841 | { | |
1842 | int r; | |
1843 | ||
028867ac | 1844 | _crypt_io_pool = KMEM_CACHE(dm_crypt_io, 0); |
1da177e4 LT |
1845 | if (!_crypt_io_pool) |
1846 | return -ENOMEM; | |
1847 | ||
1da177e4 LT |
1848 | r = dm_register_target(&crypt_target); |
1849 | if (r < 0) { | |
72d94861 | 1850 | DMERR("register failed %d", r); |
9934a8be | 1851 | kmem_cache_destroy(_crypt_io_pool); |
1da177e4 LT |
1852 | } |
1853 | ||
1da177e4 LT |
1854 | return r; |
1855 | } | |
1856 | ||
1857 | static void __exit dm_crypt_exit(void) | |
1858 | { | |
10d3bd09 | 1859 | dm_unregister_target(&crypt_target); |
1da177e4 LT |
1860 | kmem_cache_destroy(_crypt_io_pool); |
1861 | } | |
1862 | ||
1863 | module_init(dm_crypt_init); | |
1864 | module_exit(dm_crypt_exit); | |
1865 | ||
1866 | MODULE_AUTHOR("Christophe Saout <christophe@saout.de>"); | |
1867 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); | |
1868 | MODULE_LICENSE("GPL"); |