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> |
60063497 | 22 | #include <linux/atomic.h> |
378f058c | 23 | #include <linux/scatterlist.h> |
1da177e4 | 24 | #include <asm/page.h> |
48527fa7 | 25 | #include <asm/unaligned.h> |
34745785 MB |
26 | #include <crypto/hash.h> |
27 | #include <crypto/md5.h> | |
28 | #include <crypto/algapi.h> | |
1da177e4 | 29 | |
586e80e6 | 30 | #include <linux/device-mapper.h> |
1da177e4 | 31 | |
72d94861 | 32 | #define DM_MSG_PREFIX "crypt" |
1da177e4 | 33 | |
1da177e4 LT |
34 | /* |
35 | * context holding the current state of a multi-part conversion | |
36 | */ | |
37 | struct convert_context { | |
43d69034 | 38 | struct completion restart; |
1da177e4 LT |
39 | struct bio *bio_in; |
40 | struct bio *bio_out; | |
41 | unsigned int offset_in; | |
42 | unsigned int offset_out; | |
43 | unsigned int idx_in; | |
44 | unsigned int idx_out; | |
45 | sector_t sector; | |
43d69034 | 46 | atomic_t pending; |
1da177e4 LT |
47 | }; |
48 | ||
53017030 MB |
49 | /* |
50 | * per bio private data | |
51 | */ | |
52 | struct dm_crypt_io { | |
53 | struct dm_target *target; | |
54 | struct bio *base_bio; | |
55 | struct work_struct work; | |
56 | ||
57 | struct convert_context ctx; | |
58 | ||
59 | atomic_t pending; | |
60 | int error; | |
0c395b0f | 61 | sector_t sector; |
393b47ef | 62 | struct dm_crypt_io *base_io; |
53017030 MB |
63 | }; |
64 | ||
01482b76 | 65 | struct dm_crypt_request { |
b2174eeb | 66 | struct convert_context *ctx; |
01482b76 MB |
67 | struct scatterlist sg_in; |
68 | struct scatterlist sg_out; | |
2dc5327d | 69 | sector_t iv_sector; |
01482b76 MB |
70 | }; |
71 | ||
1da177e4 LT |
72 | struct crypt_config; |
73 | ||
74 | struct crypt_iv_operations { | |
75 | int (*ctr)(struct crypt_config *cc, struct dm_target *ti, | |
d469f841 | 76 | const char *opts); |
1da177e4 | 77 | void (*dtr)(struct crypt_config *cc); |
b95bf2d3 | 78 | int (*init)(struct crypt_config *cc); |
542da317 | 79 | int (*wipe)(struct crypt_config *cc); |
2dc5327d MB |
80 | int (*generator)(struct crypt_config *cc, u8 *iv, |
81 | struct dm_crypt_request *dmreq); | |
82 | int (*post)(struct crypt_config *cc, u8 *iv, | |
83 | struct dm_crypt_request *dmreq); | |
1da177e4 LT |
84 | }; |
85 | ||
60473592 | 86 | struct iv_essiv_private { |
b95bf2d3 MB |
87 | struct crypto_hash *hash_tfm; |
88 | u8 *salt; | |
60473592 MB |
89 | }; |
90 | ||
91 | struct iv_benbi_private { | |
92 | int shift; | |
93 | }; | |
94 | ||
34745785 MB |
95 | #define LMK_SEED_SIZE 64 /* hash + 0 */ |
96 | struct iv_lmk_private { | |
97 | struct crypto_shash *hash_tfm; | |
98 | u8 *seed; | |
99 | }; | |
100 | ||
1da177e4 LT |
101 | /* |
102 | * Crypt: maps a linear range of a block device | |
103 | * and encrypts / decrypts at the same time. | |
104 | */ | |
e48d4bbf | 105 | enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID }; |
c0297721 AK |
106 | |
107 | /* | |
108 | * Duplicated per-CPU state for cipher. | |
109 | */ | |
110 | struct crypt_cpu { | |
111 | struct ablkcipher_request *req; | |
c0297721 AK |
112 | /* ESSIV: struct crypto_cipher *essiv_tfm */ |
113 | void *iv_private; | |
d1f96423 | 114 | struct crypto_ablkcipher *tfms[0]; |
c0297721 AK |
115 | }; |
116 | ||
117 | /* | |
118 | * The fields in here must be read only after initialization, | |
119 | * changing state should be in crypt_cpu. | |
120 | */ | |
1da177e4 LT |
121 | struct crypt_config { |
122 | struct dm_dev *dev; | |
123 | sector_t start; | |
124 | ||
125 | /* | |
ddd42edf MB |
126 | * pool for per bio private data, crypto requests and |
127 | * encryption requeusts/buffer pages | |
1da177e4 LT |
128 | */ |
129 | mempool_t *io_pool; | |
ddd42edf | 130 | mempool_t *req_pool; |
1da177e4 | 131 | mempool_t *page_pool; |
6a24c718 | 132 | struct bio_set *bs; |
1da177e4 | 133 | |
cabf08e4 MB |
134 | struct workqueue_struct *io_queue; |
135 | struct workqueue_struct *crypt_queue; | |
3f1e9070 | 136 | |
5ebaee6d | 137 | char *cipher; |
7dbcd137 | 138 | char *cipher_string; |
5ebaee6d | 139 | |
1da177e4 | 140 | struct crypt_iv_operations *iv_gen_ops; |
79066ad3 | 141 | union { |
60473592 MB |
142 | struct iv_essiv_private essiv; |
143 | struct iv_benbi_private benbi; | |
34745785 | 144 | struct iv_lmk_private lmk; |
79066ad3 | 145 | } iv_gen_private; |
1da177e4 LT |
146 | sector_t iv_offset; |
147 | unsigned int iv_size; | |
148 | ||
c0297721 AK |
149 | /* |
150 | * Duplicated per cpu state. Access through | |
151 | * per_cpu_ptr() only. | |
152 | */ | |
153 | struct crypt_cpu __percpu *cpu; | |
d1f96423 | 154 | unsigned tfms_count; |
c0297721 | 155 | |
ddd42edf MB |
156 | /* |
157 | * Layout of each crypto request: | |
158 | * | |
159 | * struct ablkcipher_request | |
160 | * context | |
161 | * padding | |
162 | * struct dm_crypt_request | |
163 | * padding | |
164 | * IV | |
165 | * | |
166 | * The padding is added so that dm_crypt_request and the IV are | |
167 | * correctly aligned. | |
168 | */ | |
169 | unsigned int dmreq_start; | |
ddd42edf | 170 | |
e48d4bbf | 171 | unsigned long flags; |
1da177e4 | 172 | unsigned int key_size; |
d1f96423 | 173 | unsigned int key_parts; |
1da177e4 LT |
174 | u8 key[0]; |
175 | }; | |
176 | ||
6a24c718 | 177 | #define MIN_IOS 16 |
1da177e4 LT |
178 | #define MIN_POOL_PAGES 32 |
179 | #define MIN_BIO_PAGES 8 | |
180 | ||
e18b890b | 181 | static struct kmem_cache *_crypt_io_pool; |
1da177e4 | 182 | |
028867ac | 183 | static void clone_init(struct dm_crypt_io *, struct bio *); |
395b167c | 184 | static void kcryptd_queue_crypt(struct dm_crypt_io *io); |
2dc5327d | 185 | static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq); |
027581f3 | 186 | |
c0297721 AK |
187 | static struct crypt_cpu *this_crypt_config(struct crypt_config *cc) |
188 | { | |
189 | return this_cpu_ptr(cc->cpu); | |
190 | } | |
191 | ||
192 | /* | |
193 | * Use this to access cipher attributes that are the same for each CPU. | |
194 | */ | |
195 | static struct crypto_ablkcipher *any_tfm(struct crypt_config *cc) | |
196 | { | |
d1f96423 | 197 | return __this_cpu_ptr(cc->cpu)->tfms[0]; |
c0297721 AK |
198 | } |
199 | ||
1da177e4 LT |
200 | /* |
201 | * Different IV generation algorithms: | |
202 | * | |
3c164bd8 | 203 | * plain: the initial vector is the 32-bit little-endian version of the sector |
3a4fa0a2 | 204 | * number, padded with zeros if necessary. |
1da177e4 | 205 | * |
61afef61 MB |
206 | * plain64: the initial vector is the 64-bit little-endian version of the sector |
207 | * number, padded with zeros if necessary. | |
208 | * | |
3c164bd8 RS |
209 | * essiv: "encrypted sector|salt initial vector", the sector number is |
210 | * encrypted with the bulk cipher using a salt as key. The salt | |
211 | * should be derived from the bulk cipher's key via hashing. | |
1da177e4 | 212 | * |
48527fa7 RS |
213 | * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1 |
214 | * (needed for LRW-32-AES and possible other narrow block modes) | |
215 | * | |
46b47730 LN |
216 | * null: the initial vector is always zero. Provides compatibility with |
217 | * obsolete loop_fish2 devices. Do not use for new devices. | |
218 | * | |
34745785 MB |
219 | * lmk: Compatible implementation of the block chaining mode used |
220 | * by the Loop-AES block device encryption system | |
221 | * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/ | |
222 | * It operates on full 512 byte sectors and uses CBC | |
223 | * with an IV derived from the sector number, the data and | |
224 | * optionally extra IV seed. | |
225 | * This means that after decryption the first block | |
226 | * of sector must be tweaked according to decrypted data. | |
227 | * Loop-AES can use three encryption schemes: | |
228 | * version 1: is plain aes-cbc mode | |
229 | * version 2: uses 64 multikey scheme with lmk IV generator | |
230 | * version 3: the same as version 2 with additional IV seed | |
231 | * (it uses 65 keys, last key is used as IV seed) | |
232 | * | |
1da177e4 LT |
233 | * plumb: unimplemented, see: |
234 | * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454 | |
235 | */ | |
236 | ||
2dc5327d MB |
237 | static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, |
238 | struct dm_crypt_request *dmreq) | |
1da177e4 LT |
239 | { |
240 | memset(iv, 0, cc->iv_size); | |
283a8328 | 241 | *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff); |
1da177e4 LT |
242 | |
243 | return 0; | |
244 | } | |
245 | ||
61afef61 | 246 | static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv, |
2dc5327d | 247 | struct dm_crypt_request *dmreq) |
61afef61 MB |
248 | { |
249 | memset(iv, 0, cc->iv_size); | |
283a8328 | 250 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
61afef61 MB |
251 | |
252 | return 0; | |
253 | } | |
254 | ||
b95bf2d3 MB |
255 | /* Initialise ESSIV - compute salt but no local memory allocations */ |
256 | static int crypt_iv_essiv_init(struct crypt_config *cc) | |
257 | { | |
258 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
259 | struct hash_desc desc; | |
260 | struct scatterlist sg; | |
c0297721 AK |
261 | struct crypto_cipher *essiv_tfm; |
262 | int err, cpu; | |
b95bf2d3 MB |
263 | |
264 | sg_init_one(&sg, cc->key, cc->key_size); | |
265 | desc.tfm = essiv->hash_tfm; | |
266 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
267 | ||
268 | err = crypto_hash_digest(&desc, &sg, cc->key_size, essiv->salt); | |
269 | if (err) | |
270 | return err; | |
271 | ||
c0297721 AK |
272 | for_each_possible_cpu(cpu) { |
273 | essiv_tfm = per_cpu_ptr(cc->cpu, cpu)->iv_private, | |
274 | ||
275 | err = crypto_cipher_setkey(essiv_tfm, essiv->salt, | |
b95bf2d3 | 276 | crypto_hash_digestsize(essiv->hash_tfm)); |
c0297721 AK |
277 | if (err) |
278 | return err; | |
279 | } | |
280 | ||
281 | return 0; | |
b95bf2d3 MB |
282 | } |
283 | ||
542da317 MB |
284 | /* Wipe salt and reset key derived from volume key */ |
285 | static int crypt_iv_essiv_wipe(struct crypt_config *cc) | |
286 | { | |
287 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; | |
288 | unsigned salt_size = crypto_hash_digestsize(essiv->hash_tfm); | |
c0297721 AK |
289 | struct crypto_cipher *essiv_tfm; |
290 | int cpu, r, err = 0; | |
542da317 MB |
291 | |
292 | memset(essiv->salt, 0, salt_size); | |
293 | ||
c0297721 AK |
294 | for_each_possible_cpu(cpu) { |
295 | essiv_tfm = per_cpu_ptr(cc->cpu, cpu)->iv_private; | |
296 | r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size); | |
297 | if (r) | |
298 | err = r; | |
299 | } | |
300 | ||
301 | return err; | |
302 | } | |
303 | ||
304 | /* Set up per cpu cipher state */ | |
305 | static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc, | |
306 | struct dm_target *ti, | |
307 | u8 *salt, unsigned saltsize) | |
308 | { | |
309 | struct crypto_cipher *essiv_tfm; | |
310 | int err; | |
311 | ||
312 | /* Setup the essiv_tfm with the given salt */ | |
313 | essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC); | |
314 | if (IS_ERR(essiv_tfm)) { | |
315 | ti->error = "Error allocating crypto tfm for ESSIV"; | |
316 | return essiv_tfm; | |
317 | } | |
318 | ||
319 | if (crypto_cipher_blocksize(essiv_tfm) != | |
320 | crypto_ablkcipher_ivsize(any_tfm(cc))) { | |
321 | ti->error = "Block size of ESSIV cipher does " | |
322 | "not match IV size of block cipher"; | |
323 | crypto_free_cipher(essiv_tfm); | |
324 | return ERR_PTR(-EINVAL); | |
325 | } | |
326 | ||
327 | err = crypto_cipher_setkey(essiv_tfm, salt, saltsize); | |
328 | if (err) { | |
329 | ti->error = "Failed to set key for ESSIV cipher"; | |
330 | crypto_free_cipher(essiv_tfm); | |
331 | return ERR_PTR(err); | |
332 | } | |
333 | ||
334 | return essiv_tfm; | |
542da317 MB |
335 | } |
336 | ||
60473592 MB |
337 | static void crypt_iv_essiv_dtr(struct crypt_config *cc) |
338 | { | |
c0297721 AK |
339 | int cpu; |
340 | struct crypt_cpu *cpu_cc; | |
341 | struct crypto_cipher *essiv_tfm; | |
60473592 MB |
342 | struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv; |
343 | ||
b95bf2d3 MB |
344 | crypto_free_hash(essiv->hash_tfm); |
345 | essiv->hash_tfm = NULL; | |
346 | ||
347 | kzfree(essiv->salt); | |
348 | essiv->salt = NULL; | |
c0297721 AK |
349 | |
350 | for_each_possible_cpu(cpu) { | |
351 | cpu_cc = per_cpu_ptr(cc->cpu, cpu); | |
352 | essiv_tfm = cpu_cc->iv_private; | |
353 | ||
354 | if (essiv_tfm) | |
355 | crypto_free_cipher(essiv_tfm); | |
356 | ||
357 | cpu_cc->iv_private = NULL; | |
358 | } | |
60473592 MB |
359 | } |
360 | ||
1da177e4 | 361 | static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, |
d469f841 | 362 | const char *opts) |
1da177e4 | 363 | { |
5861f1be MB |
364 | struct crypto_cipher *essiv_tfm = NULL; |
365 | struct crypto_hash *hash_tfm = NULL; | |
5861f1be | 366 | u8 *salt = NULL; |
c0297721 | 367 | int err, cpu; |
1da177e4 | 368 | |
5861f1be | 369 | if (!opts) { |
72d94861 | 370 | ti->error = "Digest algorithm missing for ESSIV mode"; |
1da177e4 LT |
371 | return -EINVAL; |
372 | } | |
373 | ||
b95bf2d3 | 374 | /* Allocate hash algorithm */ |
35058687 HX |
375 | hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC); |
376 | if (IS_ERR(hash_tfm)) { | |
72d94861 | 377 | ti->error = "Error initializing ESSIV hash"; |
5861f1be MB |
378 | err = PTR_ERR(hash_tfm); |
379 | goto bad; | |
1da177e4 LT |
380 | } |
381 | ||
b95bf2d3 | 382 | salt = kzalloc(crypto_hash_digestsize(hash_tfm), GFP_KERNEL); |
5861f1be | 383 | if (!salt) { |
72d94861 | 384 | ti->error = "Error kmallocing salt storage in ESSIV"; |
5861f1be MB |
385 | err = -ENOMEM; |
386 | goto bad; | |
1da177e4 LT |
387 | } |
388 | ||
b95bf2d3 | 389 | cc->iv_gen_private.essiv.salt = salt; |
b95bf2d3 MB |
390 | cc->iv_gen_private.essiv.hash_tfm = hash_tfm; |
391 | ||
c0297721 AK |
392 | for_each_possible_cpu(cpu) { |
393 | essiv_tfm = setup_essiv_cpu(cc, ti, salt, | |
394 | crypto_hash_digestsize(hash_tfm)); | |
395 | if (IS_ERR(essiv_tfm)) { | |
396 | crypt_iv_essiv_dtr(cc); | |
397 | return PTR_ERR(essiv_tfm); | |
398 | } | |
399 | per_cpu_ptr(cc->cpu, cpu)->iv_private = essiv_tfm; | |
400 | } | |
401 | ||
1da177e4 | 402 | return 0; |
5861f1be MB |
403 | |
404 | bad: | |
5861f1be MB |
405 | if (hash_tfm && !IS_ERR(hash_tfm)) |
406 | crypto_free_hash(hash_tfm); | |
b95bf2d3 | 407 | kfree(salt); |
5861f1be | 408 | return err; |
1da177e4 LT |
409 | } |
410 | ||
2dc5327d MB |
411 | static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, |
412 | struct dm_crypt_request *dmreq) | |
1da177e4 | 413 | { |
c0297721 AK |
414 | struct crypto_cipher *essiv_tfm = this_crypt_config(cc)->iv_private; |
415 | ||
1da177e4 | 416 | memset(iv, 0, cc->iv_size); |
283a8328 | 417 | *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector); |
c0297721 AK |
418 | crypto_cipher_encrypt_one(essiv_tfm, iv, iv); |
419 | ||
1da177e4 LT |
420 | return 0; |
421 | } | |
422 | ||
48527fa7 RS |
423 | static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, |
424 | const char *opts) | |
425 | { | |
c0297721 | 426 | unsigned bs = crypto_ablkcipher_blocksize(any_tfm(cc)); |
f0d1b0b3 | 427 | int log = ilog2(bs); |
48527fa7 RS |
428 | |
429 | /* we need to calculate how far we must shift the sector count | |
430 | * to get the cipher block count, we use this shift in _gen */ | |
431 | ||
432 | if (1 << log != bs) { | |
433 | ti->error = "cypher blocksize is not a power of 2"; | |
434 | return -EINVAL; | |
435 | } | |
436 | ||
437 | if (log > 9) { | |
438 | ti->error = "cypher blocksize is > 512"; | |
439 | return -EINVAL; | |
440 | } | |
441 | ||
60473592 | 442 | cc->iv_gen_private.benbi.shift = 9 - log; |
48527fa7 RS |
443 | |
444 | return 0; | |
445 | } | |
446 | ||
447 | static void crypt_iv_benbi_dtr(struct crypt_config *cc) | |
448 | { | |
48527fa7 RS |
449 | } |
450 | ||
2dc5327d MB |
451 | static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, |
452 | struct dm_crypt_request *dmreq) | |
48527fa7 | 453 | { |
79066ad3 HX |
454 | __be64 val; |
455 | ||
48527fa7 | 456 | memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ |
79066ad3 | 457 | |
2dc5327d | 458 | val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1); |
79066ad3 | 459 | put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); |
48527fa7 | 460 | |
1da177e4 LT |
461 | return 0; |
462 | } | |
463 | ||
2dc5327d MB |
464 | static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, |
465 | struct dm_crypt_request *dmreq) | |
46b47730 LN |
466 | { |
467 | memset(iv, 0, cc->iv_size); | |
468 | ||
469 | return 0; | |
470 | } | |
471 | ||
34745785 MB |
472 | static void crypt_iv_lmk_dtr(struct crypt_config *cc) |
473 | { | |
474 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
475 | ||
476 | if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm)) | |
477 | crypto_free_shash(lmk->hash_tfm); | |
478 | lmk->hash_tfm = NULL; | |
479 | ||
480 | kzfree(lmk->seed); | |
481 | lmk->seed = NULL; | |
482 | } | |
483 | ||
484 | static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti, | |
485 | const char *opts) | |
486 | { | |
487 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
488 | ||
489 | lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0); | |
490 | if (IS_ERR(lmk->hash_tfm)) { | |
491 | ti->error = "Error initializing LMK hash"; | |
492 | return PTR_ERR(lmk->hash_tfm); | |
493 | } | |
494 | ||
495 | /* No seed in LMK version 2 */ | |
496 | if (cc->key_parts == cc->tfms_count) { | |
497 | lmk->seed = NULL; | |
498 | return 0; | |
499 | } | |
500 | ||
501 | lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL); | |
502 | if (!lmk->seed) { | |
503 | crypt_iv_lmk_dtr(cc); | |
504 | ti->error = "Error kmallocing seed storage in LMK"; | |
505 | return -ENOMEM; | |
506 | } | |
507 | ||
508 | return 0; | |
509 | } | |
510 | ||
511 | static int crypt_iv_lmk_init(struct crypt_config *cc) | |
512 | { | |
513 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
514 | int subkey_size = cc->key_size / cc->key_parts; | |
515 | ||
516 | /* LMK seed is on the position of LMK_KEYS + 1 key */ | |
517 | if (lmk->seed) | |
518 | memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size), | |
519 | crypto_shash_digestsize(lmk->hash_tfm)); | |
520 | ||
521 | return 0; | |
522 | } | |
523 | ||
524 | static int crypt_iv_lmk_wipe(struct crypt_config *cc) | |
525 | { | |
526 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
527 | ||
528 | if (lmk->seed) | |
529 | memset(lmk->seed, 0, LMK_SEED_SIZE); | |
530 | ||
531 | return 0; | |
532 | } | |
533 | ||
534 | static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, | |
535 | struct dm_crypt_request *dmreq, | |
536 | u8 *data) | |
537 | { | |
538 | struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk; | |
539 | struct { | |
540 | struct shash_desc desc; | |
541 | char ctx[crypto_shash_descsize(lmk->hash_tfm)]; | |
542 | } sdesc; | |
543 | struct md5_state md5state; | |
544 | u32 buf[4]; | |
545 | int i, r; | |
546 | ||
547 | sdesc.desc.tfm = lmk->hash_tfm; | |
548 | sdesc.desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; | |
549 | ||
550 | r = crypto_shash_init(&sdesc.desc); | |
551 | if (r) | |
552 | return r; | |
553 | ||
554 | if (lmk->seed) { | |
555 | r = crypto_shash_update(&sdesc.desc, lmk->seed, LMK_SEED_SIZE); | |
556 | if (r) | |
557 | return r; | |
558 | } | |
559 | ||
560 | /* Sector is always 512B, block size 16, add data of blocks 1-31 */ | |
561 | r = crypto_shash_update(&sdesc.desc, data + 16, 16 * 31); | |
562 | if (r) | |
563 | return r; | |
564 | ||
565 | /* Sector is cropped to 56 bits here */ | |
566 | buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF); | |
567 | buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000); | |
568 | buf[2] = cpu_to_le32(4024); | |
569 | buf[3] = 0; | |
570 | r = crypto_shash_update(&sdesc.desc, (u8 *)buf, sizeof(buf)); | |
571 | if (r) | |
572 | return r; | |
573 | ||
574 | /* No MD5 padding here */ | |
575 | r = crypto_shash_export(&sdesc.desc, &md5state); | |
576 | if (r) | |
577 | return r; | |
578 | ||
579 | for (i = 0; i < MD5_HASH_WORDS; i++) | |
580 | __cpu_to_le32s(&md5state.hash[i]); | |
581 | memcpy(iv, &md5state.hash, cc->iv_size); | |
582 | ||
583 | return 0; | |
584 | } | |
585 | ||
586 | static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, | |
587 | struct dm_crypt_request *dmreq) | |
588 | { | |
589 | u8 *src; | |
590 | int r = 0; | |
591 | ||
592 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { | |
593 | src = kmap_atomic(sg_page(&dmreq->sg_in), KM_USER0); | |
594 | r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset); | |
595 | kunmap_atomic(src, KM_USER0); | |
596 | } else | |
597 | memset(iv, 0, cc->iv_size); | |
598 | ||
599 | return r; | |
600 | } | |
601 | ||
602 | static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, | |
603 | struct dm_crypt_request *dmreq) | |
604 | { | |
605 | u8 *dst; | |
606 | int r; | |
607 | ||
608 | if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) | |
609 | return 0; | |
610 | ||
611 | dst = kmap_atomic(sg_page(&dmreq->sg_out), KM_USER0); | |
612 | r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset); | |
613 | ||
614 | /* Tweak the first block of plaintext sector */ | |
615 | if (!r) | |
616 | crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size); | |
617 | ||
618 | kunmap_atomic(dst, KM_USER0); | |
619 | return r; | |
620 | } | |
621 | ||
1da177e4 LT |
622 | static struct crypt_iv_operations crypt_iv_plain_ops = { |
623 | .generator = crypt_iv_plain_gen | |
624 | }; | |
625 | ||
61afef61 MB |
626 | static struct crypt_iv_operations crypt_iv_plain64_ops = { |
627 | .generator = crypt_iv_plain64_gen | |
628 | }; | |
629 | ||
1da177e4 LT |
630 | static struct crypt_iv_operations crypt_iv_essiv_ops = { |
631 | .ctr = crypt_iv_essiv_ctr, | |
632 | .dtr = crypt_iv_essiv_dtr, | |
b95bf2d3 | 633 | .init = crypt_iv_essiv_init, |
542da317 | 634 | .wipe = crypt_iv_essiv_wipe, |
1da177e4 LT |
635 | .generator = crypt_iv_essiv_gen |
636 | }; | |
637 | ||
48527fa7 RS |
638 | static struct crypt_iv_operations crypt_iv_benbi_ops = { |
639 | .ctr = crypt_iv_benbi_ctr, | |
640 | .dtr = crypt_iv_benbi_dtr, | |
641 | .generator = crypt_iv_benbi_gen | |
642 | }; | |
1da177e4 | 643 | |
46b47730 LN |
644 | static struct crypt_iv_operations crypt_iv_null_ops = { |
645 | .generator = crypt_iv_null_gen | |
646 | }; | |
647 | ||
34745785 MB |
648 | static struct crypt_iv_operations crypt_iv_lmk_ops = { |
649 | .ctr = crypt_iv_lmk_ctr, | |
650 | .dtr = crypt_iv_lmk_dtr, | |
651 | .init = crypt_iv_lmk_init, | |
652 | .wipe = crypt_iv_lmk_wipe, | |
653 | .generator = crypt_iv_lmk_gen, | |
654 | .post = crypt_iv_lmk_post | |
655 | }; | |
656 | ||
d469f841 MB |
657 | static void crypt_convert_init(struct crypt_config *cc, |
658 | struct convert_context *ctx, | |
659 | struct bio *bio_out, struct bio *bio_in, | |
fcd369da | 660 | sector_t sector) |
1da177e4 LT |
661 | { |
662 | ctx->bio_in = bio_in; | |
663 | ctx->bio_out = bio_out; | |
664 | ctx->offset_in = 0; | |
665 | ctx->offset_out = 0; | |
666 | ctx->idx_in = bio_in ? bio_in->bi_idx : 0; | |
667 | ctx->idx_out = bio_out ? bio_out->bi_idx : 0; | |
668 | ctx->sector = sector + cc->iv_offset; | |
43d69034 | 669 | init_completion(&ctx->restart); |
1da177e4 LT |
670 | } |
671 | ||
b2174eeb HY |
672 | static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, |
673 | struct ablkcipher_request *req) | |
674 | { | |
675 | return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); | |
676 | } | |
677 | ||
678 | static struct ablkcipher_request *req_of_dmreq(struct crypt_config *cc, | |
679 | struct dm_crypt_request *dmreq) | |
680 | { | |
681 | return (struct ablkcipher_request *)((char *)dmreq - cc->dmreq_start); | |
682 | } | |
683 | ||
2dc5327d MB |
684 | static u8 *iv_of_dmreq(struct crypt_config *cc, |
685 | struct dm_crypt_request *dmreq) | |
686 | { | |
687 | return (u8 *)ALIGN((unsigned long)(dmreq + 1), | |
688 | crypto_ablkcipher_alignmask(any_tfm(cc)) + 1); | |
689 | } | |
690 | ||
01482b76 | 691 | static int crypt_convert_block(struct crypt_config *cc, |
3a7f6c99 MB |
692 | struct convert_context *ctx, |
693 | struct ablkcipher_request *req) | |
01482b76 MB |
694 | { |
695 | struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in); | |
696 | struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out); | |
3a7f6c99 MB |
697 | struct dm_crypt_request *dmreq; |
698 | u8 *iv; | |
699 | int r = 0; | |
700 | ||
b2174eeb | 701 | dmreq = dmreq_of_req(cc, req); |
2dc5327d | 702 | iv = iv_of_dmreq(cc, dmreq); |
01482b76 | 703 | |
2dc5327d | 704 | dmreq->iv_sector = ctx->sector; |
b2174eeb | 705 | dmreq->ctx = ctx; |
3a7f6c99 MB |
706 | sg_init_table(&dmreq->sg_in, 1); |
707 | sg_set_page(&dmreq->sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT, | |
01482b76 MB |
708 | bv_in->bv_offset + ctx->offset_in); |
709 | ||
3a7f6c99 MB |
710 | sg_init_table(&dmreq->sg_out, 1); |
711 | sg_set_page(&dmreq->sg_out, bv_out->bv_page, 1 << SECTOR_SHIFT, | |
01482b76 MB |
712 | bv_out->bv_offset + ctx->offset_out); |
713 | ||
714 | ctx->offset_in += 1 << SECTOR_SHIFT; | |
715 | if (ctx->offset_in >= bv_in->bv_len) { | |
716 | ctx->offset_in = 0; | |
717 | ctx->idx_in++; | |
718 | } | |
719 | ||
720 | ctx->offset_out += 1 << SECTOR_SHIFT; | |
721 | if (ctx->offset_out >= bv_out->bv_len) { | |
722 | ctx->offset_out = 0; | |
723 | ctx->idx_out++; | |
724 | } | |
725 | ||
3a7f6c99 | 726 | if (cc->iv_gen_ops) { |
2dc5327d | 727 | r = cc->iv_gen_ops->generator(cc, iv, dmreq); |
3a7f6c99 MB |
728 | if (r < 0) |
729 | return r; | |
730 | } | |
731 | ||
732 | ablkcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out, | |
733 | 1 << SECTOR_SHIFT, iv); | |
734 | ||
735 | if (bio_data_dir(ctx->bio_in) == WRITE) | |
736 | r = crypto_ablkcipher_encrypt(req); | |
737 | else | |
738 | r = crypto_ablkcipher_decrypt(req); | |
739 | ||
2dc5327d MB |
740 | if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) |
741 | r = cc->iv_gen_ops->post(cc, iv, dmreq); | |
742 | ||
3a7f6c99 | 743 | return r; |
01482b76 MB |
744 | } |
745 | ||
95497a96 MB |
746 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
747 | int error); | |
c0297721 | 748 | |
ddd42edf MB |
749 | static void crypt_alloc_req(struct crypt_config *cc, |
750 | struct convert_context *ctx) | |
751 | { | |
c0297721 | 752 | struct crypt_cpu *this_cc = this_crypt_config(cc); |
d1f96423 | 753 | unsigned key_index = ctx->sector & (cc->tfms_count - 1); |
c0297721 AK |
754 | |
755 | if (!this_cc->req) | |
756 | this_cc->req = mempool_alloc(cc->req_pool, GFP_NOIO); | |
757 | ||
d1f96423 | 758 | ablkcipher_request_set_tfm(this_cc->req, this_cc->tfms[key_index]); |
c0297721 AK |
759 | ablkcipher_request_set_callback(this_cc->req, |
760 | CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, | |
761 | kcryptd_async_done, dmreq_of_req(cc, this_cc->req)); | |
ddd42edf MB |
762 | } |
763 | ||
1da177e4 LT |
764 | /* |
765 | * Encrypt / decrypt data from one bio to another one (can be the same one) | |
766 | */ | |
767 | static int crypt_convert(struct crypt_config *cc, | |
d469f841 | 768 | struct convert_context *ctx) |
1da177e4 | 769 | { |
c0297721 | 770 | struct crypt_cpu *this_cc = this_crypt_config(cc); |
3f1e9070 | 771 | int r; |
1da177e4 | 772 | |
c8081618 MB |
773 | atomic_set(&ctx->pending, 1); |
774 | ||
1da177e4 LT |
775 | while(ctx->idx_in < ctx->bio_in->bi_vcnt && |
776 | ctx->idx_out < ctx->bio_out->bi_vcnt) { | |
1da177e4 | 777 | |
3a7f6c99 MB |
778 | crypt_alloc_req(cc, ctx); |
779 | ||
3f1e9070 MB |
780 | atomic_inc(&ctx->pending); |
781 | ||
c0297721 | 782 | r = crypt_convert_block(cc, ctx, this_cc->req); |
3a7f6c99 MB |
783 | |
784 | switch (r) { | |
3f1e9070 | 785 | /* async */ |
3a7f6c99 MB |
786 | case -EBUSY: |
787 | wait_for_completion(&ctx->restart); | |
788 | INIT_COMPLETION(ctx->restart); | |
789 | /* fall through*/ | |
790 | case -EINPROGRESS: | |
c0297721 | 791 | this_cc->req = NULL; |
3f1e9070 MB |
792 | ctx->sector++; |
793 | continue; | |
794 | ||
795 | /* sync */ | |
3a7f6c99 | 796 | case 0: |
3f1e9070 | 797 | atomic_dec(&ctx->pending); |
3a7f6c99 | 798 | ctx->sector++; |
c7f1b204 | 799 | cond_resched(); |
3a7f6c99 | 800 | continue; |
3a7f6c99 | 801 | |
3f1e9070 MB |
802 | /* error */ |
803 | default: | |
804 | atomic_dec(&ctx->pending); | |
805 | return r; | |
806 | } | |
1da177e4 LT |
807 | } |
808 | ||
3f1e9070 | 809 | return 0; |
1da177e4 LT |
810 | } |
811 | ||
d469f841 MB |
812 | static void dm_crypt_bio_destructor(struct bio *bio) |
813 | { | |
028867ac | 814 | struct dm_crypt_io *io = bio->bi_private; |
6a24c718 MB |
815 | struct crypt_config *cc = io->target->private; |
816 | ||
817 | bio_free(bio, cc->bs); | |
d469f841 | 818 | } |
6a24c718 | 819 | |
1da177e4 LT |
820 | /* |
821 | * Generate a new unfragmented bio with the given size | |
822 | * This should never violate the device limitations | |
933f01d4 MB |
823 | * May return a smaller bio when running out of pages, indicated by |
824 | * *out_of_pages set to 1. | |
1da177e4 | 825 | */ |
933f01d4 MB |
826 | static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size, |
827 | unsigned *out_of_pages) | |
1da177e4 | 828 | { |
027581f3 | 829 | struct crypt_config *cc = io->target->private; |
8b004457 | 830 | struct bio *clone; |
1da177e4 | 831 | unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
b4e3ca1a | 832 | gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM; |
91e10625 MB |
833 | unsigned i, len; |
834 | struct page *page; | |
1da177e4 | 835 | |
2f9941b6 | 836 | clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); |
8b004457 | 837 | if (!clone) |
1da177e4 | 838 | return NULL; |
1da177e4 | 839 | |
027581f3 | 840 | clone_init(io, clone); |
933f01d4 | 841 | *out_of_pages = 0; |
6a24c718 | 842 | |
f97380bc | 843 | for (i = 0; i < nr_iovecs; i++) { |
91e10625 | 844 | page = mempool_alloc(cc->page_pool, gfp_mask); |
933f01d4 MB |
845 | if (!page) { |
846 | *out_of_pages = 1; | |
1da177e4 | 847 | break; |
933f01d4 | 848 | } |
1da177e4 LT |
849 | |
850 | /* | |
851 | * if additional pages cannot be allocated without waiting, | |
852 | * return a partially allocated bio, the caller will then try | |
853 | * to allocate additional bios while submitting this partial bio | |
854 | */ | |
f97380bc | 855 | if (i == (MIN_BIO_PAGES - 1)) |
1da177e4 LT |
856 | gfp_mask = (gfp_mask | __GFP_NOWARN) & ~__GFP_WAIT; |
857 | ||
91e10625 MB |
858 | len = (size > PAGE_SIZE) ? PAGE_SIZE : size; |
859 | ||
860 | if (!bio_add_page(clone, page, len, 0)) { | |
861 | mempool_free(page, cc->page_pool); | |
862 | break; | |
863 | } | |
1da177e4 | 864 | |
91e10625 | 865 | size -= len; |
1da177e4 LT |
866 | } |
867 | ||
8b004457 MB |
868 | if (!clone->bi_size) { |
869 | bio_put(clone); | |
1da177e4 LT |
870 | return NULL; |
871 | } | |
872 | ||
8b004457 | 873 | return clone; |
1da177e4 LT |
874 | } |
875 | ||
644bd2f0 | 876 | static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone) |
1da177e4 | 877 | { |
644bd2f0 | 878 | unsigned int i; |
1da177e4 LT |
879 | struct bio_vec *bv; |
880 | ||
644bd2f0 | 881 | for (i = 0; i < clone->bi_vcnt; i++) { |
8b004457 | 882 | bv = bio_iovec_idx(clone, i); |
1da177e4 LT |
883 | BUG_ON(!bv->bv_page); |
884 | mempool_free(bv->bv_page, cc->page_pool); | |
885 | bv->bv_page = NULL; | |
886 | } | |
887 | } | |
888 | ||
dc440d1e MB |
889 | static struct dm_crypt_io *crypt_io_alloc(struct dm_target *ti, |
890 | struct bio *bio, sector_t sector) | |
891 | { | |
892 | struct crypt_config *cc = ti->private; | |
893 | struct dm_crypt_io *io; | |
894 | ||
895 | io = mempool_alloc(cc->io_pool, GFP_NOIO); | |
896 | io->target = ti; | |
897 | io->base_bio = bio; | |
898 | io->sector = sector; | |
899 | io->error = 0; | |
393b47ef | 900 | io->base_io = NULL; |
dc440d1e MB |
901 | atomic_set(&io->pending, 0); |
902 | ||
903 | return io; | |
904 | } | |
905 | ||
3e1a8bdd MB |
906 | static void crypt_inc_pending(struct dm_crypt_io *io) |
907 | { | |
908 | atomic_inc(&io->pending); | |
909 | } | |
910 | ||
1da177e4 LT |
911 | /* |
912 | * One of the bios was finished. Check for completion of | |
913 | * the whole request and correctly clean up the buffer. | |
393b47ef | 914 | * If base_io is set, wait for the last fragment to complete. |
1da177e4 | 915 | */ |
5742fd77 | 916 | static void crypt_dec_pending(struct dm_crypt_io *io) |
1da177e4 | 917 | { |
5742fd77 | 918 | struct crypt_config *cc = io->target->private; |
b35f8caa MB |
919 | struct bio *base_bio = io->base_bio; |
920 | struct dm_crypt_io *base_io = io->base_io; | |
921 | int error = io->error; | |
1da177e4 LT |
922 | |
923 | if (!atomic_dec_and_test(&io->pending)) | |
924 | return; | |
925 | ||
b35f8caa MB |
926 | mempool_free(io, cc->io_pool); |
927 | ||
928 | if (likely(!base_io)) | |
929 | bio_endio(base_bio, error); | |
393b47ef | 930 | else { |
b35f8caa MB |
931 | if (error && !base_io->error) |
932 | base_io->error = error; | |
933 | crypt_dec_pending(base_io); | |
393b47ef | 934 | } |
1da177e4 LT |
935 | } |
936 | ||
937 | /* | |
cabf08e4 | 938 | * kcryptd/kcryptd_io: |
1da177e4 LT |
939 | * |
940 | * Needed because it would be very unwise to do decryption in an | |
23541d2d | 941 | * interrupt context. |
cabf08e4 MB |
942 | * |
943 | * kcryptd performs the actual encryption or decryption. | |
944 | * | |
945 | * kcryptd_io performs the IO submission. | |
946 | * | |
947 | * They must be separated as otherwise the final stages could be | |
948 | * starved by new requests which can block in the first stages due | |
949 | * to memory allocation. | |
c0297721 AK |
950 | * |
951 | * The work is done per CPU global for all dm-crypt instances. | |
952 | * They should not depend on each other and do not block. | |
1da177e4 | 953 | */ |
6712ecf8 | 954 | static void crypt_endio(struct bio *clone, int error) |
8b004457 | 955 | { |
028867ac | 956 | struct dm_crypt_io *io = clone->bi_private; |
8b004457 | 957 | struct crypt_config *cc = io->target->private; |
ee7a491e | 958 | unsigned rw = bio_data_dir(clone); |
8b004457 | 959 | |
adfe4770 MB |
960 | if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error)) |
961 | error = -EIO; | |
962 | ||
8b004457 | 963 | /* |
6712ecf8 | 964 | * free the processed pages |
8b004457 | 965 | */ |
ee7a491e | 966 | if (rw == WRITE) |
644bd2f0 | 967 | crypt_free_buffer_pages(cc, clone); |
8b004457 MB |
968 | |
969 | bio_put(clone); | |
8b004457 | 970 | |
ee7a491e MB |
971 | if (rw == READ && !error) { |
972 | kcryptd_queue_crypt(io); | |
973 | return; | |
974 | } | |
5742fd77 MB |
975 | |
976 | if (unlikely(error)) | |
977 | io->error = error; | |
978 | ||
979 | crypt_dec_pending(io); | |
8b004457 MB |
980 | } |
981 | ||
028867ac | 982 | static void clone_init(struct dm_crypt_io *io, struct bio *clone) |
8b004457 MB |
983 | { |
984 | struct crypt_config *cc = io->target->private; | |
985 | ||
986 | clone->bi_private = io; | |
987 | clone->bi_end_io = crypt_endio; | |
988 | clone->bi_bdev = cc->dev->bdev; | |
989 | clone->bi_rw = io->base_bio->bi_rw; | |
027581f3 | 990 | clone->bi_destructor = dm_crypt_bio_destructor; |
8b004457 MB |
991 | } |
992 | ||
20c82538 | 993 | static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) |
8b004457 MB |
994 | { |
995 | struct crypt_config *cc = io->target->private; | |
996 | struct bio *base_bio = io->base_bio; | |
997 | struct bio *clone; | |
93e605c2 | 998 | |
8b004457 MB |
999 | /* |
1000 | * The block layer might modify the bvec array, so always | |
1001 | * copy the required bvecs because we need the original | |
1002 | * one in order to decrypt the whole bio data *afterwards*. | |
1003 | */ | |
20c82538 | 1004 | clone = bio_alloc_bioset(gfp, bio_segments(base_bio), cc->bs); |
7eaceacc | 1005 | if (!clone) |
20c82538 | 1006 | return 1; |
8b004457 | 1007 | |
20c82538 MB |
1008 | crypt_inc_pending(io); |
1009 | ||
8b004457 MB |
1010 | clone_init(io, clone); |
1011 | clone->bi_idx = 0; | |
1012 | clone->bi_vcnt = bio_segments(base_bio); | |
1013 | clone->bi_size = base_bio->bi_size; | |
0c395b0f | 1014 | clone->bi_sector = cc->start + io->sector; |
8b004457 MB |
1015 | memcpy(clone->bi_io_vec, bio_iovec(base_bio), |
1016 | sizeof(struct bio_vec) * clone->bi_vcnt); | |
8b004457 | 1017 | |
93e605c2 | 1018 | generic_make_request(clone); |
20c82538 | 1019 | return 0; |
8b004457 MB |
1020 | } |
1021 | ||
4e4eef64 MB |
1022 | static void kcryptd_io_write(struct dm_crypt_io *io) |
1023 | { | |
95497a96 | 1024 | struct bio *clone = io->ctx.bio_out; |
95497a96 | 1025 | generic_make_request(clone); |
4e4eef64 MB |
1026 | } |
1027 | ||
395b167c AK |
1028 | static void kcryptd_io(struct work_struct *work) |
1029 | { | |
1030 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); | |
1031 | ||
20c82538 MB |
1032 | if (bio_data_dir(io->base_bio) == READ) { |
1033 | crypt_inc_pending(io); | |
1034 | if (kcryptd_io_read(io, GFP_NOIO)) | |
1035 | io->error = -ENOMEM; | |
1036 | crypt_dec_pending(io); | |
1037 | } else | |
395b167c AK |
1038 | kcryptd_io_write(io); |
1039 | } | |
1040 | ||
1041 | static void kcryptd_queue_io(struct dm_crypt_io *io) | |
1042 | { | |
1043 | struct crypt_config *cc = io->target->private; | |
1044 | ||
1045 | INIT_WORK(&io->work, kcryptd_io); | |
1046 | queue_work(cc->io_queue, &io->work); | |
1047 | } | |
1048 | ||
95497a96 MB |
1049 | static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, |
1050 | int error, int async) | |
4e4eef64 | 1051 | { |
dec1cedf MB |
1052 | struct bio *clone = io->ctx.bio_out; |
1053 | struct crypt_config *cc = io->target->private; | |
1054 | ||
1055 | if (unlikely(error < 0)) { | |
1056 | crypt_free_buffer_pages(cc, clone); | |
1057 | bio_put(clone); | |
1058 | io->error = -EIO; | |
6c031f41 | 1059 | crypt_dec_pending(io); |
dec1cedf MB |
1060 | return; |
1061 | } | |
1062 | ||
1063 | /* crypt_convert should have filled the clone bio */ | |
1064 | BUG_ON(io->ctx.idx_out < clone->bi_vcnt); | |
1065 | ||
1066 | clone->bi_sector = cc->start + io->sector; | |
899c95d3 | 1067 | |
95497a96 MB |
1068 | if (async) |
1069 | kcryptd_queue_io(io); | |
1e37bb8e | 1070 | else |
95497a96 | 1071 | generic_make_request(clone); |
4e4eef64 MB |
1072 | } |
1073 | ||
fc5a5e9a | 1074 | static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) |
8b004457 MB |
1075 | { |
1076 | struct crypt_config *cc = io->target->private; | |
8b004457 | 1077 | struct bio *clone; |
393b47ef | 1078 | struct dm_crypt_io *new_io; |
c8081618 | 1079 | int crypt_finished; |
933f01d4 | 1080 | unsigned out_of_pages = 0; |
dec1cedf | 1081 | unsigned remaining = io->base_bio->bi_size; |
b635b00e | 1082 | sector_t sector = io->sector; |
dec1cedf | 1083 | int r; |
8b004457 | 1084 | |
fc5a5e9a MB |
1085 | /* |
1086 | * Prevent io from disappearing until this function completes. | |
1087 | */ | |
1088 | crypt_inc_pending(io); | |
b635b00e | 1089 | crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector); |
fc5a5e9a | 1090 | |
93e605c2 MB |
1091 | /* |
1092 | * The allocated buffers can be smaller than the whole bio, | |
1093 | * so repeat the whole process until all the data can be handled. | |
1094 | */ | |
1095 | while (remaining) { | |
933f01d4 | 1096 | clone = crypt_alloc_buffer(io, remaining, &out_of_pages); |
23541d2d | 1097 | if (unlikely(!clone)) { |
5742fd77 | 1098 | io->error = -ENOMEM; |
fc5a5e9a | 1099 | break; |
23541d2d | 1100 | } |
93e605c2 | 1101 | |
53017030 MB |
1102 | io->ctx.bio_out = clone; |
1103 | io->ctx.idx_out = 0; | |
93e605c2 | 1104 | |
dec1cedf | 1105 | remaining -= clone->bi_size; |
b635b00e | 1106 | sector += bio_sectors(clone); |
93e605c2 | 1107 | |
4e594098 | 1108 | crypt_inc_pending(io); |
dec1cedf | 1109 | r = crypt_convert(cc, &io->ctx); |
c8081618 | 1110 | crypt_finished = atomic_dec_and_test(&io->ctx.pending); |
f97380bc | 1111 | |
c8081618 MB |
1112 | /* Encryption was already finished, submit io now */ |
1113 | if (crypt_finished) { | |
3a7f6c99 | 1114 | kcryptd_crypt_write_io_submit(io, r, 0); |
c8081618 MB |
1115 | |
1116 | /* | |
1117 | * If there was an error, do not try next fragments. | |
1118 | * For async, error is processed in async handler. | |
1119 | */ | |
6c031f41 | 1120 | if (unlikely(r < 0)) |
fc5a5e9a | 1121 | break; |
b635b00e MB |
1122 | |
1123 | io->sector = sector; | |
4e594098 | 1124 | } |
93e605c2 | 1125 | |
933f01d4 MB |
1126 | /* |
1127 | * Out of memory -> run queues | |
1128 | * But don't wait if split was due to the io size restriction | |
1129 | */ | |
1130 | if (unlikely(out_of_pages)) | |
8aa7e847 | 1131 | congestion_wait(BLK_RW_ASYNC, HZ/100); |
933f01d4 | 1132 | |
393b47ef MB |
1133 | /* |
1134 | * With async crypto it is unsafe to share the crypto context | |
1135 | * between fragments, so switch to a new dm_crypt_io structure. | |
1136 | */ | |
1137 | if (unlikely(!crypt_finished && remaining)) { | |
1138 | new_io = crypt_io_alloc(io->target, io->base_bio, | |
1139 | sector); | |
1140 | crypt_inc_pending(new_io); | |
1141 | crypt_convert_init(cc, &new_io->ctx, NULL, | |
1142 | io->base_bio, sector); | |
1143 | new_io->ctx.idx_in = io->ctx.idx_in; | |
1144 | new_io->ctx.offset_in = io->ctx.offset_in; | |
1145 | ||
1146 | /* | |
1147 | * Fragments after the first use the base_io | |
1148 | * pending count. | |
1149 | */ | |
1150 | if (!io->base_io) | |
1151 | new_io->base_io = io; | |
1152 | else { | |
1153 | new_io->base_io = io->base_io; | |
1154 | crypt_inc_pending(io->base_io); | |
1155 | crypt_dec_pending(io); | |
1156 | } | |
1157 | ||
1158 | io = new_io; | |
1159 | } | |
93e605c2 | 1160 | } |
899c95d3 MB |
1161 | |
1162 | crypt_dec_pending(io); | |
84131db6 MB |
1163 | } |
1164 | ||
4e4eef64 | 1165 | static void kcryptd_crypt_read_done(struct dm_crypt_io *io, int error) |
5742fd77 MB |
1166 | { |
1167 | if (unlikely(error < 0)) | |
1168 | io->error = -EIO; | |
1169 | ||
1170 | crypt_dec_pending(io); | |
1171 | } | |
1172 | ||
4e4eef64 | 1173 | static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) |
8b004457 MB |
1174 | { |
1175 | struct crypt_config *cc = io->target->private; | |
5742fd77 | 1176 | int r = 0; |
1da177e4 | 1177 | |
3e1a8bdd | 1178 | crypt_inc_pending(io); |
3a7f6c99 | 1179 | |
53017030 | 1180 | crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio, |
0c395b0f | 1181 | io->sector); |
1da177e4 | 1182 | |
5742fd77 MB |
1183 | r = crypt_convert(cc, &io->ctx); |
1184 | ||
3f1e9070 | 1185 | if (atomic_dec_and_test(&io->ctx.pending)) |
3a7f6c99 MB |
1186 | kcryptd_crypt_read_done(io, r); |
1187 | ||
1188 | crypt_dec_pending(io); | |
1da177e4 LT |
1189 | } |
1190 | ||
95497a96 MB |
1191 | static void kcryptd_async_done(struct crypto_async_request *async_req, |
1192 | int error) | |
1193 | { | |
b2174eeb HY |
1194 | struct dm_crypt_request *dmreq = async_req->data; |
1195 | struct convert_context *ctx = dmreq->ctx; | |
95497a96 MB |
1196 | struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); |
1197 | struct crypt_config *cc = io->target->private; | |
1198 | ||
1199 | if (error == -EINPROGRESS) { | |
1200 | complete(&ctx->restart); | |
1201 | return; | |
1202 | } | |
1203 | ||
2dc5327d MB |
1204 | if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) |
1205 | error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq); | |
1206 | ||
b2174eeb | 1207 | mempool_free(req_of_dmreq(cc, dmreq), cc->req_pool); |
95497a96 MB |
1208 | |
1209 | if (!atomic_dec_and_test(&ctx->pending)) | |
1210 | return; | |
1211 | ||
1212 | if (bio_data_dir(io->base_bio) == READ) | |
1213 | kcryptd_crypt_read_done(io, error); | |
1214 | else | |
1215 | kcryptd_crypt_write_io_submit(io, error, 1); | |
1216 | } | |
1217 | ||
395b167c | 1218 | static void kcryptd_crypt(struct work_struct *work) |
1da177e4 | 1219 | { |
028867ac | 1220 | struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); |
8b004457 | 1221 | |
cabf08e4 | 1222 | if (bio_data_dir(io->base_bio) == READ) |
395b167c | 1223 | kcryptd_crypt_read_convert(io); |
4e4eef64 | 1224 | else |
395b167c | 1225 | kcryptd_crypt_write_convert(io); |
cabf08e4 MB |
1226 | } |
1227 | ||
395b167c | 1228 | static void kcryptd_queue_crypt(struct dm_crypt_io *io) |
cabf08e4 | 1229 | { |
395b167c | 1230 | struct crypt_config *cc = io->target->private; |
cabf08e4 | 1231 | |
395b167c AK |
1232 | INIT_WORK(&io->work, kcryptd_crypt); |
1233 | queue_work(cc->crypt_queue, &io->work); | |
1da177e4 LT |
1234 | } |
1235 | ||
1236 | /* | |
1237 | * Decode key from its hex representation | |
1238 | */ | |
1239 | static int crypt_decode_key(u8 *key, char *hex, unsigned int size) | |
1240 | { | |
1241 | char buffer[3]; | |
1242 | char *endp; | |
1243 | unsigned int i; | |
1244 | ||
1245 | buffer[2] = '\0'; | |
1246 | ||
8b004457 | 1247 | for (i = 0; i < size; i++) { |
1da177e4 LT |
1248 | buffer[0] = *hex++; |
1249 | buffer[1] = *hex++; | |
1250 | ||
1251 | key[i] = (u8)simple_strtoul(buffer, &endp, 16); | |
1252 | ||
1253 | if (endp != &buffer[2]) | |
1254 | return -EINVAL; | |
1255 | } | |
1256 | ||
1257 | if (*hex != '\0') | |
1258 | return -EINVAL; | |
1259 | ||
1260 | return 0; | |
1261 | } | |
1262 | ||
1263 | /* | |
1264 | * Encode key into its hex representation | |
1265 | */ | |
1266 | static void crypt_encode_key(char *hex, u8 *key, unsigned int size) | |
1267 | { | |
1268 | unsigned int i; | |
1269 | ||
8b004457 | 1270 | for (i = 0; i < size; i++) { |
1da177e4 LT |
1271 | sprintf(hex, "%02x", *key); |
1272 | hex += 2; | |
1273 | key++; | |
1274 | } | |
1275 | } | |
1276 | ||
d1f96423 MB |
1277 | static void crypt_free_tfms(struct crypt_config *cc, int cpu) |
1278 | { | |
1279 | struct crypt_cpu *cpu_cc = per_cpu_ptr(cc->cpu, cpu); | |
1280 | unsigned i; | |
1281 | ||
1282 | for (i = 0; i < cc->tfms_count; i++) | |
1283 | if (cpu_cc->tfms[i] && !IS_ERR(cpu_cc->tfms[i])) { | |
1284 | crypto_free_ablkcipher(cpu_cc->tfms[i]); | |
1285 | cpu_cc->tfms[i] = NULL; | |
1286 | } | |
1287 | } | |
1288 | ||
1289 | static int crypt_alloc_tfms(struct crypt_config *cc, int cpu, char *ciphermode) | |
1290 | { | |
1291 | struct crypt_cpu *cpu_cc = per_cpu_ptr(cc->cpu, cpu); | |
1292 | unsigned i; | |
1293 | int err; | |
1294 | ||
1295 | for (i = 0; i < cc->tfms_count; i++) { | |
1296 | cpu_cc->tfms[i] = crypto_alloc_ablkcipher(ciphermode, 0, 0); | |
1297 | if (IS_ERR(cpu_cc->tfms[i])) { | |
1298 | err = PTR_ERR(cpu_cc->tfms[i]); | |
1299 | crypt_free_tfms(cc, cpu); | |
1300 | return err; | |
1301 | } | |
1302 | } | |
1303 | ||
1304 | return 0; | |
1305 | } | |
1306 | ||
c0297721 AK |
1307 | static int crypt_setkey_allcpus(struct crypt_config *cc) |
1308 | { | |
d1f96423 MB |
1309 | unsigned subkey_size = cc->key_size >> ilog2(cc->tfms_count); |
1310 | int cpu, err = 0, i, r; | |
c0297721 AK |
1311 | |
1312 | for_each_possible_cpu(cpu) { | |
d1f96423 MB |
1313 | for (i = 0; i < cc->tfms_count; i++) { |
1314 | r = crypto_ablkcipher_setkey(per_cpu_ptr(cc->cpu, cpu)->tfms[i], | |
1315 | cc->key + (i * subkey_size), subkey_size); | |
1316 | if (r) | |
1317 | err = r; | |
1318 | } | |
c0297721 AK |
1319 | } |
1320 | ||
1321 | return err; | |
1322 | } | |
1323 | ||
e48d4bbf MB |
1324 | static int crypt_set_key(struct crypt_config *cc, char *key) |
1325 | { | |
de8be5ac MB |
1326 | int r = -EINVAL; |
1327 | int key_string_len = strlen(key); | |
1328 | ||
69a8cfcd | 1329 | /* The key size may not be changed. */ |
de8be5ac MB |
1330 | if (cc->key_size != (key_string_len >> 1)) |
1331 | goto out; | |
e48d4bbf | 1332 | |
69a8cfcd MB |
1333 | /* Hyphen (which gives a key_size of zero) means there is no key. */ |
1334 | if (!cc->key_size && strcmp(key, "-")) | |
de8be5ac | 1335 | goto out; |
e48d4bbf | 1336 | |
69a8cfcd | 1337 | if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0) |
de8be5ac | 1338 | goto out; |
e48d4bbf MB |
1339 | |
1340 | set_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1341 | ||
de8be5ac MB |
1342 | r = crypt_setkey_allcpus(cc); |
1343 | ||
1344 | out: | |
1345 | /* Hex key string not needed after here, so wipe it. */ | |
1346 | memset(key, '0', key_string_len); | |
1347 | ||
1348 | return r; | |
e48d4bbf MB |
1349 | } |
1350 | ||
1351 | static int crypt_wipe_key(struct crypt_config *cc) | |
1352 | { | |
1353 | clear_bit(DM_CRYPT_KEY_VALID, &cc->flags); | |
1354 | memset(&cc->key, 0, cc->key_size * sizeof(u8)); | |
c0297721 AK |
1355 | |
1356 | return crypt_setkey_allcpus(cc); | |
e48d4bbf MB |
1357 | } |
1358 | ||
28513fcc MB |
1359 | static void crypt_dtr(struct dm_target *ti) |
1360 | { | |
1361 | struct crypt_config *cc = ti->private; | |
c0297721 AK |
1362 | struct crypt_cpu *cpu_cc; |
1363 | int cpu; | |
28513fcc MB |
1364 | |
1365 | ti->private = NULL; | |
1366 | ||
1367 | if (!cc) | |
1368 | return; | |
1369 | ||
1370 | if (cc->io_queue) | |
1371 | destroy_workqueue(cc->io_queue); | |
1372 | if (cc->crypt_queue) | |
1373 | destroy_workqueue(cc->crypt_queue); | |
1374 | ||
c0297721 AK |
1375 | if (cc->cpu) |
1376 | for_each_possible_cpu(cpu) { | |
1377 | cpu_cc = per_cpu_ptr(cc->cpu, cpu); | |
1378 | if (cpu_cc->req) | |
1379 | mempool_free(cpu_cc->req, cc->req_pool); | |
d1f96423 | 1380 | crypt_free_tfms(cc, cpu); |
c0297721 AK |
1381 | } |
1382 | ||
28513fcc MB |
1383 | if (cc->bs) |
1384 | bioset_free(cc->bs); | |
1385 | ||
1386 | if (cc->page_pool) | |
1387 | mempool_destroy(cc->page_pool); | |
1388 | if (cc->req_pool) | |
1389 | mempool_destroy(cc->req_pool); | |
1390 | if (cc->io_pool) | |
1391 | mempool_destroy(cc->io_pool); | |
1392 | ||
1393 | if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) | |
1394 | cc->iv_gen_ops->dtr(cc); | |
1395 | ||
28513fcc MB |
1396 | if (cc->dev) |
1397 | dm_put_device(ti, cc->dev); | |
1398 | ||
c0297721 AK |
1399 | if (cc->cpu) |
1400 | free_percpu(cc->cpu); | |
1401 | ||
5ebaee6d | 1402 | kzfree(cc->cipher); |
7dbcd137 | 1403 | kzfree(cc->cipher_string); |
28513fcc MB |
1404 | |
1405 | /* Must zero key material before freeing */ | |
1406 | kzfree(cc); | |
1407 | } | |
1408 | ||
5ebaee6d MB |
1409 | static int crypt_ctr_cipher(struct dm_target *ti, |
1410 | char *cipher_in, char *key) | |
1da177e4 | 1411 | { |
5ebaee6d | 1412 | struct crypt_config *cc = ti->private; |
d1f96423 | 1413 | char *tmp, *cipher, *chainmode, *ivmode, *ivopts, *keycount; |
5ebaee6d | 1414 | char *cipher_api = NULL; |
c0297721 | 1415 | int cpu, ret = -EINVAL; |
1da177e4 | 1416 | |
5ebaee6d MB |
1417 | /* Convert to crypto api definition? */ |
1418 | if (strchr(cipher_in, '(')) { | |
1419 | ti->error = "Bad cipher specification"; | |
1da177e4 LT |
1420 | return -EINVAL; |
1421 | } | |
1422 | ||
7dbcd137 MB |
1423 | cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL); |
1424 | if (!cc->cipher_string) | |
1425 | goto bad_mem; | |
1426 | ||
5ebaee6d MB |
1427 | /* |
1428 | * Legacy dm-crypt cipher specification | |
d1f96423 | 1429 | * cipher[:keycount]-mode-iv:ivopts |
5ebaee6d MB |
1430 | */ |
1431 | tmp = cipher_in; | |
d1f96423 MB |
1432 | keycount = strsep(&tmp, "-"); |
1433 | cipher = strsep(&keycount, ":"); | |
1434 | ||
1435 | if (!keycount) | |
1436 | cc->tfms_count = 1; | |
1437 | else if (sscanf(keycount, "%u", &cc->tfms_count) != 1 || | |
1438 | !is_power_of_2(cc->tfms_count)) { | |
1439 | ti->error = "Bad cipher key count specification"; | |
1440 | return -EINVAL; | |
1441 | } | |
1442 | cc->key_parts = cc->tfms_count; | |
5ebaee6d MB |
1443 | |
1444 | cc->cipher = kstrdup(cipher, GFP_KERNEL); | |
1445 | if (!cc->cipher) | |
1446 | goto bad_mem; | |
1447 | ||
1da177e4 LT |
1448 | chainmode = strsep(&tmp, "-"); |
1449 | ivopts = strsep(&tmp, "-"); | |
1450 | ivmode = strsep(&ivopts, ":"); | |
1451 | ||
1452 | if (tmp) | |
5ebaee6d | 1453 | DMWARN("Ignoring unexpected additional cipher options"); |
1da177e4 | 1454 | |
d1f96423 MB |
1455 | cc->cpu = __alloc_percpu(sizeof(*(cc->cpu)) + |
1456 | cc->tfms_count * sizeof(*(cc->cpu->tfms)), | |
1457 | __alignof__(struct crypt_cpu)); | |
c0297721 AK |
1458 | if (!cc->cpu) { |
1459 | ti->error = "Cannot allocate per cpu state"; | |
1460 | goto bad_mem; | |
1461 | } | |
1462 | ||
7dbcd137 MB |
1463 | /* |
1464 | * For compatibility with the original dm-crypt mapping format, if | |
1465 | * only the cipher name is supplied, use cbc-plain. | |
1466 | */ | |
5ebaee6d | 1467 | if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) { |
1da177e4 LT |
1468 | chainmode = "cbc"; |
1469 | ivmode = "plain"; | |
1470 | } | |
1471 | ||
d1806f6a | 1472 | if (strcmp(chainmode, "ecb") && !ivmode) { |
5ebaee6d MB |
1473 | ti->error = "IV mechanism required"; |
1474 | return -EINVAL; | |
1da177e4 LT |
1475 | } |
1476 | ||
5ebaee6d MB |
1477 | cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); |
1478 | if (!cipher_api) | |
1479 | goto bad_mem; | |
1480 | ||
1481 | ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME, | |
1482 | "%s(%s)", chainmode, cipher); | |
1483 | if (ret < 0) { | |
1484 | kfree(cipher_api); | |
1485 | goto bad_mem; | |
1da177e4 LT |
1486 | } |
1487 | ||
5ebaee6d | 1488 | /* Allocate cipher */ |
c0297721 | 1489 | for_each_possible_cpu(cpu) { |
d1f96423 MB |
1490 | ret = crypt_alloc_tfms(cc, cpu, cipher_api); |
1491 | if (ret < 0) { | |
c0297721 AK |
1492 | ti->error = "Error allocating crypto tfm"; |
1493 | goto bad; | |
1494 | } | |
1da177e4 | 1495 | } |
1da177e4 | 1496 | |
5ebaee6d MB |
1497 | /* Initialize and set key */ |
1498 | ret = crypt_set_key(cc, key); | |
28513fcc | 1499 | if (ret < 0) { |
0b430958 | 1500 | ti->error = "Error decoding and setting key"; |
28513fcc | 1501 | goto bad; |
0b430958 MB |
1502 | } |
1503 | ||
5ebaee6d | 1504 | /* Initialize IV */ |
c0297721 | 1505 | cc->iv_size = crypto_ablkcipher_ivsize(any_tfm(cc)); |
5ebaee6d MB |
1506 | if (cc->iv_size) |
1507 | /* at least a 64 bit sector number should fit in our buffer */ | |
1508 | cc->iv_size = max(cc->iv_size, | |
1509 | (unsigned int)(sizeof(u64) / sizeof(u8))); | |
1510 | else if (ivmode) { | |
1511 | DMWARN("Selected cipher does not support IVs"); | |
1512 | ivmode = NULL; | |
1513 | } | |
1514 | ||
1515 | /* Choose ivmode, see comments at iv code. */ | |
1da177e4 LT |
1516 | if (ivmode == NULL) |
1517 | cc->iv_gen_ops = NULL; | |
1518 | else if (strcmp(ivmode, "plain") == 0) | |
1519 | cc->iv_gen_ops = &crypt_iv_plain_ops; | |
61afef61 MB |
1520 | else if (strcmp(ivmode, "plain64") == 0) |
1521 | cc->iv_gen_ops = &crypt_iv_plain64_ops; | |
1da177e4 LT |
1522 | else if (strcmp(ivmode, "essiv") == 0) |
1523 | cc->iv_gen_ops = &crypt_iv_essiv_ops; | |
48527fa7 RS |
1524 | else if (strcmp(ivmode, "benbi") == 0) |
1525 | cc->iv_gen_ops = &crypt_iv_benbi_ops; | |
46b47730 LN |
1526 | else if (strcmp(ivmode, "null") == 0) |
1527 | cc->iv_gen_ops = &crypt_iv_null_ops; | |
34745785 MB |
1528 | else if (strcmp(ivmode, "lmk") == 0) { |
1529 | cc->iv_gen_ops = &crypt_iv_lmk_ops; | |
1530 | /* Version 2 and 3 is recognised according | |
1531 | * to length of provided multi-key string. | |
1532 | * If present (version 3), last key is used as IV seed. | |
1533 | */ | |
1534 | if (cc->key_size % cc->key_parts) | |
1535 | cc->key_parts++; | |
1536 | } else { | |
5ebaee6d | 1537 | ret = -EINVAL; |
72d94861 | 1538 | ti->error = "Invalid IV mode"; |
28513fcc | 1539 | goto bad; |
1da177e4 LT |
1540 | } |
1541 | ||
28513fcc MB |
1542 | /* Allocate IV */ |
1543 | if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) { | |
1544 | ret = cc->iv_gen_ops->ctr(cc, ti, ivopts); | |
1545 | if (ret < 0) { | |
1546 | ti->error = "Error creating IV"; | |
1547 | goto bad; | |
1548 | } | |
1549 | } | |
1da177e4 | 1550 | |
28513fcc MB |
1551 | /* Initialize IV (set keys for ESSIV etc) */ |
1552 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) { | |
1553 | ret = cc->iv_gen_ops->init(cc); | |
1554 | if (ret < 0) { | |
1555 | ti->error = "Error initialising IV"; | |
1556 | goto bad; | |
1557 | } | |
b95bf2d3 MB |
1558 | } |
1559 | ||
5ebaee6d MB |
1560 | ret = 0; |
1561 | bad: | |
1562 | kfree(cipher_api); | |
1563 | return ret; | |
1564 | ||
1565 | bad_mem: | |
1566 | ti->error = "Cannot allocate cipher strings"; | |
1567 | return -ENOMEM; | |
1568 | } | |
1569 | ||
1570 | /* | |
1571 | * Construct an encryption mapping: | |
1572 | * <cipher> <key> <iv_offset> <dev_path> <start> | |
1573 | */ | |
1574 | static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
1575 | { | |
1576 | struct crypt_config *cc; | |
772ae5f5 | 1577 | unsigned int key_size, opt_params; |
5ebaee6d MB |
1578 | unsigned long long tmpll; |
1579 | int ret; | |
772ae5f5 MB |
1580 | struct dm_arg_set as; |
1581 | const char *opt_string; | |
1582 | ||
1583 | static struct dm_arg _args[] = { | |
1584 | {0, 1, "Invalid number of feature args"}, | |
1585 | }; | |
5ebaee6d | 1586 | |
772ae5f5 | 1587 | if (argc < 5) { |
5ebaee6d MB |
1588 | ti->error = "Not enough arguments"; |
1589 | return -EINVAL; | |
1da177e4 LT |
1590 | } |
1591 | ||
5ebaee6d MB |
1592 | key_size = strlen(argv[1]) >> 1; |
1593 | ||
1594 | cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL); | |
1595 | if (!cc) { | |
1596 | ti->error = "Cannot allocate encryption context"; | |
1597 | return -ENOMEM; | |
1598 | } | |
69a8cfcd | 1599 | cc->key_size = key_size; |
5ebaee6d MB |
1600 | |
1601 | ti->private = cc; | |
1602 | ret = crypt_ctr_cipher(ti, argv[0], argv[1]); | |
1603 | if (ret < 0) | |
1604 | goto bad; | |
1605 | ||
28513fcc | 1606 | ret = -ENOMEM; |
93d2341c | 1607 | cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool); |
1da177e4 | 1608 | if (!cc->io_pool) { |
72d94861 | 1609 | ti->error = "Cannot allocate crypt io mempool"; |
28513fcc | 1610 | goto bad; |
1da177e4 LT |
1611 | } |
1612 | ||
ddd42edf | 1613 | cc->dmreq_start = sizeof(struct ablkcipher_request); |
c0297721 | 1614 | cc->dmreq_start += crypto_ablkcipher_reqsize(any_tfm(cc)); |
ddd42edf | 1615 | cc->dmreq_start = ALIGN(cc->dmreq_start, crypto_tfm_ctx_alignment()); |
c0297721 | 1616 | cc->dmreq_start += crypto_ablkcipher_alignmask(any_tfm(cc)) & |
3a7f6c99 | 1617 | ~(crypto_tfm_ctx_alignment() - 1); |
ddd42edf MB |
1618 | |
1619 | cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + | |
1620 | sizeof(struct dm_crypt_request) + cc->iv_size); | |
1621 | if (!cc->req_pool) { | |
1622 | ti->error = "Cannot allocate crypt request mempool"; | |
28513fcc | 1623 | goto bad; |
ddd42edf | 1624 | } |
ddd42edf | 1625 | |
a19b27ce | 1626 | cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0); |
1da177e4 | 1627 | if (!cc->page_pool) { |
72d94861 | 1628 | ti->error = "Cannot allocate page mempool"; |
28513fcc | 1629 | goto bad; |
1da177e4 LT |
1630 | } |
1631 | ||
bb799ca0 | 1632 | cc->bs = bioset_create(MIN_IOS, 0); |
6a24c718 MB |
1633 | if (!cc->bs) { |
1634 | ti->error = "Cannot allocate crypt bioset"; | |
28513fcc | 1635 | goto bad; |
6a24c718 MB |
1636 | } |
1637 | ||
28513fcc | 1638 | ret = -EINVAL; |
4ee218cd | 1639 | if (sscanf(argv[2], "%llu", &tmpll) != 1) { |
72d94861 | 1640 | ti->error = "Invalid iv_offset sector"; |
28513fcc | 1641 | goto bad; |
1da177e4 | 1642 | } |
4ee218cd | 1643 | cc->iv_offset = tmpll; |
1da177e4 | 1644 | |
28513fcc MB |
1645 | if (dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev)) { |
1646 | ti->error = "Device lookup failed"; | |
1647 | goto bad; | |
1648 | } | |
1649 | ||
4ee218cd | 1650 | if (sscanf(argv[4], "%llu", &tmpll) != 1) { |
72d94861 | 1651 | ti->error = "Invalid device sector"; |
28513fcc | 1652 | goto bad; |
1da177e4 | 1653 | } |
4ee218cd | 1654 | cc->start = tmpll; |
1da177e4 | 1655 | |
772ae5f5 MB |
1656 | argv += 5; |
1657 | argc -= 5; | |
1658 | ||
1659 | /* Optional parameters */ | |
1660 | if (argc) { | |
1661 | as.argc = argc; | |
1662 | as.argv = argv; | |
1663 | ||
1664 | ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); | |
1665 | if (ret) | |
1666 | goto bad; | |
1667 | ||
1668 | opt_string = dm_shift_arg(&as); | |
1669 | ||
1670 | if (opt_params == 1 && opt_string && | |
1671 | !strcasecmp(opt_string, "allow_discards")) | |
1672 | ti->num_discard_requests = 1; | |
1673 | else if (opt_params) { | |
1674 | ret = -EINVAL; | |
1675 | ti->error = "Invalid feature arguments"; | |
1676 | goto bad; | |
1677 | } | |
1678 | } | |
1679 | ||
28513fcc | 1680 | ret = -ENOMEM; |
c0297721 AK |
1681 | cc->io_queue = alloc_workqueue("kcryptd_io", |
1682 | WQ_NON_REENTRANT| | |
1683 | WQ_MEM_RECLAIM, | |
1684 | 1); | |
cabf08e4 MB |
1685 | if (!cc->io_queue) { |
1686 | ti->error = "Couldn't create kcryptd io queue"; | |
28513fcc | 1687 | goto bad; |
cabf08e4 MB |
1688 | } |
1689 | ||
c0297721 AK |
1690 | cc->crypt_queue = alloc_workqueue("kcryptd", |
1691 | WQ_NON_REENTRANT| | |
1692 | WQ_CPU_INTENSIVE| | |
1693 | WQ_MEM_RECLAIM, | |
1694 | 1); | |
cabf08e4 | 1695 | if (!cc->crypt_queue) { |
9934a8be | 1696 | ti->error = "Couldn't create kcryptd queue"; |
28513fcc | 1697 | goto bad; |
9934a8be MB |
1698 | } |
1699 | ||
647c7db1 | 1700 | ti->num_flush_requests = 1; |
1da177e4 LT |
1701 | return 0; |
1702 | ||
28513fcc MB |
1703 | bad: |
1704 | crypt_dtr(ti); | |
1705 | return ret; | |
1da177e4 LT |
1706 | } |
1707 | ||
1da177e4 LT |
1708 | static int crypt_map(struct dm_target *ti, struct bio *bio, |
1709 | union map_info *map_context) | |
1710 | { | |
028867ac | 1711 | struct dm_crypt_io *io; |
647c7db1 MP |
1712 | struct crypt_config *cc; |
1713 | ||
772ae5f5 MB |
1714 | /* |
1715 | * If bio is REQ_FLUSH or REQ_DISCARD, just bypass crypt queues. | |
1716 | * - for REQ_FLUSH device-mapper core ensures that no IO is in-flight | |
1717 | * - for REQ_DISCARD caller must use flush if IO ordering matters | |
1718 | */ | |
1719 | if (unlikely(bio->bi_rw & (REQ_FLUSH | REQ_DISCARD))) { | |
647c7db1 MP |
1720 | cc = ti->private; |
1721 | bio->bi_bdev = cc->dev->bdev; | |
772ae5f5 MB |
1722 | if (bio_sectors(bio)) |
1723 | bio->bi_sector = cc->start + dm_target_offset(ti, bio->bi_sector); | |
647c7db1 MP |
1724 | return DM_MAPIO_REMAPPED; |
1725 | } | |
1da177e4 | 1726 | |
b441a262 | 1727 | io = crypt_io_alloc(ti, bio, dm_target_offset(ti, bio->bi_sector)); |
cabf08e4 | 1728 | |
20c82538 MB |
1729 | if (bio_data_dir(io->base_bio) == READ) { |
1730 | if (kcryptd_io_read(io, GFP_NOWAIT)) | |
1731 | kcryptd_queue_io(io); | |
1732 | } else | |
cabf08e4 | 1733 | kcryptd_queue_crypt(io); |
1da177e4 | 1734 | |
d2a7ad29 | 1735 | return DM_MAPIO_SUBMITTED; |
1da177e4 LT |
1736 | } |
1737 | ||
1738 | static int crypt_status(struct dm_target *ti, status_type_t type, | |
1739 | char *result, unsigned int maxlen) | |
1740 | { | |
5ebaee6d | 1741 | struct crypt_config *cc = ti->private; |
1da177e4 LT |
1742 | unsigned int sz = 0; |
1743 | ||
1744 | switch (type) { | |
1745 | case STATUSTYPE_INFO: | |
1746 | result[0] = '\0'; | |
1747 | break; | |
1748 | ||
1749 | case STATUSTYPE_TABLE: | |
7dbcd137 | 1750 | DMEMIT("%s ", cc->cipher_string); |
1da177e4 LT |
1751 | |
1752 | if (cc->key_size > 0) { | |
1753 | if ((maxlen - sz) < ((cc->key_size << 1) + 1)) | |
1754 | return -ENOMEM; | |
1755 | ||
1756 | crypt_encode_key(result + sz, cc->key, cc->key_size); | |
1757 | sz += cc->key_size << 1; | |
1758 | } else { | |
1759 | if (sz >= maxlen) | |
1760 | return -ENOMEM; | |
1761 | result[sz++] = '-'; | |
1762 | } | |
1763 | ||
4ee218cd AM |
1764 | DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset, |
1765 | cc->dev->name, (unsigned long long)cc->start); | |
772ae5f5 MB |
1766 | |
1767 | if (ti->num_discard_requests) | |
1768 | DMEMIT(" 1 allow_discards"); | |
1769 | ||
1da177e4 LT |
1770 | break; |
1771 | } | |
1772 | return 0; | |
1773 | } | |
1774 | ||
e48d4bbf MB |
1775 | static void crypt_postsuspend(struct dm_target *ti) |
1776 | { | |
1777 | struct crypt_config *cc = ti->private; | |
1778 | ||
1779 | set_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1780 | } | |
1781 | ||
1782 | static int crypt_preresume(struct dm_target *ti) | |
1783 | { | |
1784 | struct crypt_config *cc = ti->private; | |
1785 | ||
1786 | if (!test_bit(DM_CRYPT_KEY_VALID, &cc->flags)) { | |
1787 | DMERR("aborting resume - crypt key is not set."); | |
1788 | return -EAGAIN; | |
1789 | } | |
1790 | ||
1791 | return 0; | |
1792 | } | |
1793 | ||
1794 | static void crypt_resume(struct dm_target *ti) | |
1795 | { | |
1796 | struct crypt_config *cc = ti->private; | |
1797 | ||
1798 | clear_bit(DM_CRYPT_SUSPENDED, &cc->flags); | |
1799 | } | |
1800 | ||
1801 | /* Message interface | |
1802 | * key set <key> | |
1803 | * key wipe | |
1804 | */ | |
1805 | static int crypt_message(struct dm_target *ti, unsigned argc, char **argv) | |
1806 | { | |
1807 | struct crypt_config *cc = ti->private; | |
542da317 | 1808 | int ret = -EINVAL; |
e48d4bbf MB |
1809 | |
1810 | if (argc < 2) | |
1811 | goto error; | |
1812 | ||
498f0103 | 1813 | if (!strcasecmp(argv[0], "key")) { |
e48d4bbf MB |
1814 | if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) { |
1815 | DMWARN("not suspended during key manipulation."); | |
1816 | return -EINVAL; | |
1817 | } | |
498f0103 | 1818 | if (argc == 3 && !strcasecmp(argv[1], "set")) { |
542da317 MB |
1819 | ret = crypt_set_key(cc, argv[2]); |
1820 | if (ret) | |
1821 | return ret; | |
1822 | if (cc->iv_gen_ops && cc->iv_gen_ops->init) | |
1823 | ret = cc->iv_gen_ops->init(cc); | |
1824 | return ret; | |
1825 | } | |
498f0103 | 1826 | if (argc == 2 && !strcasecmp(argv[1], "wipe")) { |
542da317 MB |
1827 | if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) { |
1828 | ret = cc->iv_gen_ops->wipe(cc); | |
1829 | if (ret) | |
1830 | return ret; | |
1831 | } | |
e48d4bbf | 1832 | return crypt_wipe_key(cc); |
542da317 | 1833 | } |
e48d4bbf MB |
1834 | } |
1835 | ||
1836 | error: | |
1837 | DMWARN("unrecognised message received."); | |
1838 | return -EINVAL; | |
1839 | } | |
1840 | ||
d41e26b9 MB |
1841 | static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm, |
1842 | struct bio_vec *biovec, int max_size) | |
1843 | { | |
1844 | struct crypt_config *cc = ti->private; | |
1845 | struct request_queue *q = bdev_get_queue(cc->dev->bdev); | |
1846 | ||
1847 | if (!q->merge_bvec_fn) | |
1848 | return max_size; | |
1849 | ||
1850 | bvm->bi_bdev = cc->dev->bdev; | |
b441a262 | 1851 | bvm->bi_sector = cc->start + dm_target_offset(ti, bvm->bi_sector); |
d41e26b9 MB |
1852 | |
1853 | return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); | |
1854 | } | |
1855 | ||
af4874e0 MS |
1856 | static int crypt_iterate_devices(struct dm_target *ti, |
1857 | iterate_devices_callout_fn fn, void *data) | |
1858 | { | |
1859 | struct crypt_config *cc = ti->private; | |
1860 | ||
5dea271b | 1861 | return fn(ti, cc->dev, cc->start, ti->len, data); |
af4874e0 MS |
1862 | } |
1863 | ||
1da177e4 LT |
1864 | static struct target_type crypt_target = { |
1865 | .name = "crypt", | |
772ae5f5 | 1866 | .version = {1, 11, 0}, |
1da177e4 LT |
1867 | .module = THIS_MODULE, |
1868 | .ctr = crypt_ctr, | |
1869 | .dtr = crypt_dtr, | |
1870 | .map = crypt_map, | |
1871 | .status = crypt_status, | |
e48d4bbf MB |
1872 | .postsuspend = crypt_postsuspend, |
1873 | .preresume = crypt_preresume, | |
1874 | .resume = crypt_resume, | |
1875 | .message = crypt_message, | |
d41e26b9 | 1876 | .merge = crypt_merge, |
af4874e0 | 1877 | .iterate_devices = crypt_iterate_devices, |
1da177e4 LT |
1878 | }; |
1879 | ||
1880 | static int __init dm_crypt_init(void) | |
1881 | { | |
1882 | int r; | |
1883 | ||
028867ac | 1884 | _crypt_io_pool = KMEM_CACHE(dm_crypt_io, 0); |
1da177e4 LT |
1885 | if (!_crypt_io_pool) |
1886 | return -ENOMEM; | |
1887 | ||
1da177e4 LT |
1888 | r = dm_register_target(&crypt_target); |
1889 | if (r < 0) { | |
72d94861 | 1890 | DMERR("register failed %d", r); |
9934a8be | 1891 | kmem_cache_destroy(_crypt_io_pool); |
1da177e4 LT |
1892 | } |
1893 | ||
1da177e4 LT |
1894 | return r; |
1895 | } | |
1896 | ||
1897 | static void __exit dm_crypt_exit(void) | |
1898 | { | |
10d3bd09 | 1899 | dm_unregister_target(&crypt_target); |
1da177e4 LT |
1900 | kmem_cache_destroy(_crypt_io_pool); |
1901 | } | |
1902 | ||
1903 | module_init(dm_crypt_init); | |
1904 | module_exit(dm_crypt_exit); | |
1905 | ||
1906 | MODULE_AUTHOR("Christophe Saout <christophe@saout.de>"); | |
1907 | MODULE_DESCRIPTION(DM_NAME " target for transparent encryption / decryption"); | |
1908 | MODULE_LICENSE("GPL"); |